As filed with the Securities and Exchange Commission on December 22, 2014.

Registration No. 333-196975

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Amendment No. 5

Form S-1

REGISTRATION STATEMENT

Under

The Securities Act of 1933

TOBIRA THERAPEUTICS, INC.

(Exact Name of Registrant as Specified in its Charter)

Delaware

2834

20-5531916

(State or Other Jurisdiction of

Incorporation or Organization)

(Primary Standard Industrial

Classification Code Number)

(I.R.S. Employer

Identification Number)

Tobira Therapeutics, Inc.

701 Gateway Blvd, Suite 300,

South San Francisco, CA 94080

(650) 741-6625

(Address, including zip code and telephone number, including area code, of registrant’s principal executive offices)

Laurent Fischer, M.D.

Chief Executive Officer

Tobira Therapeutics, Inc.

701 Gateway Blvd, Suite 300,

South San Francisco, CA 94080

(650) 741-6625

(Name, address, including zip code and telephone number, including area code, of agent for service)

Copies to:

Jay K. Hachigian, Esq.

Bennett L. Yee, Esq.

Richard C. Blake, Esq.

Gunderson Dettmer Stough

Villeneuve Franklin & Hachigian, LLP

1200 Seaport Boulevard

Redwood City, CA 94063

(650) 321-2400

Christopher Peetz

Chief Financial Officer

Tobira Therapeutics, Inc.

701 Gateway Blvd, Suite 300,

South San Francisco, CA 94080

(650) 741-6625

Jonathan L. Kravetz, Esq.

John T. Rudy, Esq.

Daniel A. Bagliebter, Esq.

Mintz, Levin, Cohn, Ferris, Glovsky and

Popeo, P.C.

One Financial Center

Boston, MA 02111

(617) 542-6000

Approximate date of commencement of proposed sale to the public: As soon as practicable after the effective date of this Registration Statement.

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box. ¨

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until the Registration Statement shall become effective on such date as the Commission, acting pursuant to such Section 8(a), may determine.

The information in this preliminary prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and it is not soliciting an offer to buy these securities in any state or other jurisdiction where the offer or sale is not permitted.

Subject to completion, dated December 22, 2014

PRELIMINARY PROSPECTUS

LOGO

SHARES OF COMMON STOCK

This is the initial public offering of common stock of Tobira Therapeutics, Inc. We are offering shares of our common stock in this offering. Prior to this offering, there has been no public market for our common stock.

We expect the initial public offering price per share to be between $ and $ .

Our common stock has been approved for listing on The NASDAQ Global Market under the symbol “TBRA.”

We are an “emerging growth company” as that term is used in the Jumpstart Our Business Startups Act of 2012, and, as such, have elected to comply with certain reduced public company reporting requirements for this prospectus and future filings.

Investing in our common stock involves a high degree of risk. Before buying any shares, you should carefully read the discussion of material risks of investing in our common stock in “Risk Factors” beginning on page 11 of this prospectus.


	Per Share	Total
Initial public offering price	$	$
Underwriting discounts and commissions⁽¹⁾	$	$
Proceeds, before expenses, to us	$	$

(1)

We have agreed to reimburse the underwriters for certain expenses in connection with this offering. See “Underwriting” beginning on page 135 of this prospectus.

All of our existing principal investors and their affiliated entities have indicated an interest in purchasing an aggregate of approximately $ million of shares of our common stock in this offering at the initial public offering price. However, because indications of interest are not binding agreements or commitments to purchase, the underwriters could determine to sell more, less or no shares to any of these investors and their affiliates and any of these investors and their affiliates could determine to purchase more, less or no shares in this offering. The underwriters will receive the same underwriting discounts and commissions on any shares purchased by these persons as they will on any other shares sold to the public in this offering.

We have granted the underwriters the option to purchase up to an additional shares of common stock. The underwriters can exercise this right at any time within 30 days after the date of this prospectus.

Neither the Securities and Exchange Commission nor any other regulatory body has approved or disapproved these securities, or passed upon the accuracy or adequacy of this prospectus. Any representation to the contrary is a criminal offense.

The underwriters expect to deliver the shares of common stock to investors on or about , 2014.

Sole Bookrunner

Leerink Partners

Oppenheimer & Co.

Lead Managers

Needham & Company

The date of this prospectus is , 2014

TABLE OF CONTENTS


	Page
Prospectus Summary		1
Risk Factors		11
Information Regarding Forward-Looking Statements		44
Industry and Market Data		46
Use of Proceeds		47
Dividend Policy		48
Capitalization		49
Dilution		51
Selected Financial Data		53
Management’s Discussion and Analysis of Financial Condition and Results of Operations		55
Business		70
Management		100
Executive Compensation		108
Certain Relationships and Related Party Transactions		119
Principal Stockholders		123
Description of Capital Stock		126
Shares Eligible for Future Sale		130
Material United States Tax Considerations to Non-U.S. Holders		132
Underwriting		135
Legal Matters		140
Experts		140
Where You Can Find Additional Information		140
Index to Financial Statements		F-1

You should rely only on the information contained in this prospectus and any free writing prospectus we have prepared in connection with this offering. Neither we nor the underwriters have authorized anyone to provide you with information or make any representations different from or in addition to those contained in this prospectus or any free writing prospectus we have prepared in connection with this offering. We and the underwriters take no responsibility for and can provide no assurance as to the reliability of any information that others may give you. We are offering to sell shares of common stock and seeking offers to buy shares of our common stock only in jurisdictions where offers and sales are permitted. The information contained in this prospectus is accurate only as of the date of this prospectus, regardless of the time of delivery of this prospectus or any sale of the common stock. Our business, financial condition, results of operations and prospectus may have changed since that date.

Through and including , 2014 (25 days after commencement of this offering), all dealers that effect transactions in these securities, whether or not participating in this offering, may be required to deliver a prospectus. This is in addition to the dealers’ obligation to deliver a prospectus when acting as underwriters and with respect to their unsold allotments or subscriptions.

For investors outside the United States: Neither we nor the underwriters have done anything that would permit this offering or possession or distribution of this prospectus in any jurisdiction where action for that purpose is required, other than in the United States. You are required to inform yourselves about and observe any restrictions relating to this offering and the distribution of this prospectus outside of the United States.

PROSPECTUS SUMMARY

This summary highlights information contained in greater detail elsewhere in this prospectus. This summary is not complete and does not contain all of the information you should consider in making your investment decision. You should read the entire prospectus carefully before making an investment in our common stock. You should carefully consider, among other things, our financial statements and the related notes and the sections entitled “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included elsewhere in this prospectus.

Overview

We are a clinical-stage biopharmaceutical company focused on the development and commercialization of innovative therapeutics to treat liver disease, human immunodeficiency virus, or HIV, fibrosis and inflammation. Our lead product candidate, cenicriviroc, or CVC, is a proprietary immunomodulator that can potentially be used to treat a number of disease states with high unmet medical need. We are developing CVC for nonalcoholic steatohepatitis, or NASH, for which we are enrolling a Phase 2b clinical trial. CVC is a once-daily pill with well-established safety and tolerability in approximately 580 subjects dosed in completed Phase 1 and Phase 2 trials, including a pharmacokinetics and safety study in subjects with liver cirrhosis and 115 HIV type 1, or HIV-1, infected subjects on treatment for up to 48 weeks. We also plan to advance CVC in a fixed-dose combination for HIV-1 infection through Phase 3 development and commercialization in collaboration with a strategic partner or with non-dilutive financing.

CVC is a first-in-class oral, long-acting, once-daily, potent dual inhibitor, or antagonist, of chemokine receptor type 2, or CCR2, and type 5, or CCR5, with anti-inflammatory and anti-fibrotic activity. We are initially developing CVC for NASH, a liver disease characterized by fatty deposits, cellular damage, inflammation and fibrosis. CVC binds to both CCR2 and CCR5 and blocks the migration of immune cells to the liver in response to cellular damage, thereby disrupting the immuno-inflammatory cascade and the activation of fibrosis generating hepatic stellate cells, or HSCs. We believe CVC is an excellent candidate for the chronic treatment of NASH due to its safety profile in healthy subjects and HIV patients and first-in-class dual mechanism of action targeting fibrosis-generating cells. We have also demonstrated supportive efficacy signals of CVC in a retrospective analysis from a completed Phase 2b study of CVC in HIV-1 infected subjects which showed a favorable impact on fibrosis risk scores and soluble CD14, a marker of inflammation and monocyte activation. In addition, we have completed multiple animal models in which CVC demonstrated a statistically significant reduction in fibrosis with CVC treatment. We also recently completed an open label Phase 1 clinical trial in adult subjects (n=31) with either normal hepatic function or a Child-Pugh liver disease score of A or B. A Child-Pugh score is a well-established medical scoring system used to assess the prognosis of cirrhotic liver disease. In the study, CVC was generally well-tolerated in this mild-to-moderate liver function-impaired patient population and did not require dose adjustments. We believe there are no other product candidates in development or approved for NASH that target the immuno-inflammatory pathways responsible for fibrosis.

NASH is a serious inflammatory type of non-alcoholic fatty liver disease, or NAFLD. NAFLD is the most common liver disease and is associated with obesity and type-2 diabetes and is characterized by the accumulation of fat in the liver. The rising prevalence of obesity-related disorders has contributed to a rapid rise in the prevalence of NASH and NAFLD. In the United States, NAFLD affects approximately 27%-34% of the population, or an estimated 86 million to 108 million people. Approximately 10%-20% of people with NAFLD will progress to NASH. Current estimates place NASH prevalence at approximately 9 million to 15 million people in the United States, or 3%-5% of the population, with similar prevalence in other major markets. Prevalence is also rising in developing regions, likely due to the adoption of a more sedentary lifestyle and westernized diet consisting of processed food with high fat and fructose content.

In addition to the accumulation of fat in the liver, NASH is characterized by inflammation and cellular damage with or without fibrosis. NASH is a severe condition that can lead to fibrosis and eventually progress to cirrhosis, portal hypertension, esophageal varices, ascites, liver cancer and liver failure. Progression to cirrhosis and other late stage complications can occur within 5 to 10 years after initial NASH diagnosis. NASH patients with type-2 diabetes and/or obesity are at a significantly higher risk of disease progression. Once the disease advances beyond NASH to these life-threatening conditions, liver transplantation is the only alternative. The Centers for Disease Control and Prevention, or CDC, projects the prevalence of obesity to increase from 34% of the U.S. population to 42% by 2030. Driven by the epidemic of obesity, NASH is projected to become the leading cause of liver transplants by 2020. Given the extremely limited availability of organ donors and high transplant costs, NASH patients who require transplantation will place a significant economic burden on the healthcare system.

There is a significant unmet need for well-tolerated oral treatments for NASH. As there are no approved pharmaceutical agents for NASH, its market size is difficult to estimate. However, we believe there is a significant market opportunity in NASH and that other well-established markets targeting liver disease, such as hepatitis C, or HCV, provide a good basis for comparison. HCV affects 3.2 million people in the United States and is forecasted by Datamonitor to have $19.2 billion of drug sales in 2016. We believe that NASH, with no cure or effective treatment available, is a significantly larger market opportunity than HCV as the prevalence of NASH is estimated to be three to five times that of HCV in the United States.

Our Development Plans

In September of 2014, we initiated our Phase 2b proof of concept study, entitled “Cenicriviroc Efficacy and Safety Study in Adult Subjects with Nonalcoholic Steatohepatitis and Liver Fibrosis”, which we refer to as CENTAUR. This trial is a randomized, double-blind study of CVC versus placebo in patients with NASH and liver fibrosis, including those with type-2 diabetes and/or one or more components of metabolic syndrome. The study is being conducted in North America, Europe and Australia and is led by Dr. Scott Friedman as Study Chairman. We plan to enroll approximately 250 patients in this two-arm clinical trial randomized 1:1 for once-daily treatment with CVC or placebo for a first period of one year. Following the primary endpoint at one year, patients on CVC will continue on CVC and patients on placebo will either start receiving CVC or continue on placebo for a second year (1:1). The primary analysis will be conducted at one year and endpoints will include a two point improvement in the NAFLD Activity Score, or NAS, without worsening of fibrosis as assessed by liver biopsy, resolution of NASH, collagen morphometry, validated fibrosis scores, noninvasive imaging and biomarkers. Endpoints will be measured again at two years. We expect to reach our primary analysis in the second quarter of 2016. In September 2013, the American Association for the Study of Liver Disease, or AASLD, and the FDA conducted a joint workshop focused on trial designs and endpoints in drug and diagnostic development for liver disease secondary to NAFLD, including NASH. We believe the CENTAUR study design incorporates surrogate endpoints that may form the basis for demonstrating efficacy required for approval based on feedback from experts involved in this workshop and feedback from the FDA in a June 2014 meeting. We expect additional FDA guidance to be available by the time we plan our Phase 3 program for NASH.

In addition to the CENTAUR study, we are initiating additional studies to evaluate CVC in the treatment of NASH. In the first quarter of 2015, we plan to initiate a Phase 1 pharmacokinetics (PK) and safety study in healthy subjects in combination with pioglitazone from which we expect to have data in 2015. We are also planning additional preclinical studies that will evaluate CVC in combination with additional experimental agents. In the first half of 2015 we plan to initiate a Phase 2a study to evaluate the effect of CCR2 and CCR5 antagonism by CVC on peripheral and adipose tissue insulin sensitivity in adult obese subjects with prediabetes and suspected non-alcoholic fatty liver disease (NAFLD). We expect to have preliminary results from this study in the second half of 2015.

We are also developing CVC as part of a fixed-dose combination backbone with lamivudine, also known as 3TC, for the treatment of infection by HIV-1, the virus that causes acquired immunodeficiency syndrome, or

AIDS. A fixed-dose combination product contains at least two pharmaceutical agents in a single tablet, in this case CVC and lamivudine, and may then be tested or used in combination with additional therapies to provide a complete anti-retroviral regimen. The term “backbone” is commonly used in the context of HIV treatment to describe fixed-dose combination products which may be used with other HIV drugs and allow for a variety of three-drug combinations.

CVC inhibits CCR5, the primary co-receptor required for HIV-1 to infect immune cells. Despite the availability of potent and well-tolerated classes of anti-HIV therapeutics combined in single tablet regimens, patients on chronic therapy face toxicities due to lifelong treatment and are particularly at risk for metabolic, cardiovascular and renal disease complications. U.S. sales of HIV therapies are forecasted to be $9.6 billion in 2014 and growing to $12.8 billion in 2020, according to Datamonitor. Based on efficacy and safety results from a completed randomized Phase 2b study and our end of Phase 2 meeting with the FDA, we believe that CVC, as part of a novel fixed-dose CVC/3TC backbone in combination with other agents used to treat HIV-1, has the potential to provide good efficacy and tolerability and to address toxicities associated with currently used established backbones such as kidney and bone toxicity, hypersensitivy reaction and risk of myocardial infarction. Furthermore, despite recently approved potent and well-tolerated classes of third agent drugs including integrase inhibitors, patients with HIV face chronic toxicity and are developing and dying from “age-related diseases” a decade younger than their uninfected counterparts. We plan to advance this Phase 3 program in collaboration with a strategic partner or with non-dilutive financing.

Below is our clinical and preclinical pipeline:

LOGO

Our Management Team

Our management team has extensive experience in developing and commercializing therapeutics for liver disease and treatment of HIV infection. Our Chief Executive Officer, Dr. Laurent Fischer, has been involved with Tobira since 2009, providing strategic direction to our programs in fibrosis and HIV. Dr. Fischer was Chief Executive Officer of Ocera Therapeutics, Inc. and Jennerex, Inc., both developers of therapeutics for advanced liver disease. Dr. Fischer also has experience developing and launching products for HIV infection at Dupont-Merck Pharmaceutical Company, Dupont Pharmaceuticals Company and F. Hoffmann-La Roche, Ltd. Our Chief Medical Officer, Dr. Éric Lefebvre, has held senior management roles in clinical development and medical affairs in HIV and HCV drug development at Tibotec Pharmaceuticals, Inc., Janssen Pharmaceuticals, Inc. and GlaxoSmithKline, Inc. Canada. Our Chief Financial Officer, Christopher Peetz, has held financial and corporate development leadership roles with mergers and acquisition experience at Jennerex, Inc. and Onyx Pharmaceuticals, Inc. Our Chief Operating Officer, Helen Jenkins, has held senior operational leadership roles at Nuon Therapeutics, Inc., Saegis Pharmaceuticals, Inc. and Genentech, Inc. Our Vice President of Regulatory Affairs, Martine Kraus, has held various leadership roles at Gilead Sciences, Inc. and has led the regulatory approval of several anti-viral products and combinations, including Truvada.

Our Strategy

Our goal is to become a leading biopharmaceutical company developing and commercializing innovative immunomodulatory therapies for liver disease, HIV, fibrosis and inflammation. To achieve our goal, we plan to:

•

Complete clinical development and seek regulatory approval of CVC in NASH. We plan to complete enrollment of our Phase 2b clinical trial of CVC in NASH in the second quarter of 2015 and reach the primary endpoint in the second quarter of 2016. NASH is a disease driven by the growing epidemic of obesity, with a significant unmet need for approved therapies that are effective and well tolerated. We believe CVC is an excellent candidate for the chronic treatment of NASH due to its safety profile and first-in-class dual mechanism of action targeting fibrosis-generating cells.

•

Establish commercial capabilities to market CVC as a leading treatment for NASH. If approved, we intend to establish a specialty sales force and develop targeted commercial capabilities in key geographies to promote CVC to liver specialists and other physicians treating this disease. Patients with NASH are primarily managed by a concentrated group of liver specialists in the United States. We believe this will enable us to launch CVC in NASH in a cost-effective, targeted manner.

•

Advance the clinical development program for CVC in HIV-1 in collaboration with a strategic partner or with non-dilutive financing. We have obtained initial evidence of efficacy and safety in a Phase 2b clinical trial of CVC in HIV-1 infected patients. We intend to seek collaborators or non-dilutive financing to initiate and complete Phase 3 clinical testing of a fixed-dose combination backbone of CVC/3TC in HIV-1 infected patients and seek approval of this novel CVC-containing regimen for use in combination HIV therapy with third agents.

•

Opportunistically grow our pipeline through additional indications for CVC and in-licensing opportunities. We believe that CVC has the potential to be an effective immunomodulatory treatment for other CCR2 and CCR5 mediated inflammatory and fibrotic driven diseases such as kidney fibrosis, graft-versus-host disease, or GVHD, and certain cancers. For example, results from a study of kidney fibrosis in mice were presented at the International AIDS Conference in July 2014. We will continue to seek ways to broaden our pipeline and leverage our capabilities and expertise.

Emerging Growth Company Status

We are an “emerging growth company,” as defined in the Jumpstart Our Business Startups Act of 2012, or the JOBS Act, and are eligible to take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not “emerging growth companies,” including, but not limited to: presenting only two years of audited financial statements in addition to any required unaudited interim financial statements with correspondingly reduced “Management’s Discussion and Analysis of Financial Conditions and Results of Operations” disclosure in this prospectus; not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002, or the Sarbanes-Oxley Act; having reduced disclosure obligations regarding executive compensation in our periodic reports and proxy or information statements; being exempt from the requirements to hold a non-binding advisory vote on executive compensation or seek stockholder approval of any golden parachute payments not previously approved; and not being required to adopt certain accounting standards until those standards would otherwise apply to private companies.

of new or revised accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. However, we are electing not to take advantage of such extended transition period, and as a result, we will comply with new or revised accounting standards on the relevant dates on which adoption of such standards is required for non-emerging growth companies. Section 107 of the JOBS Act provides that our decision to not take advantage of the extended transition period for complying with new or revised accounting standards is irrevocable.

We could remain an “emerging growth company” until the earliest to occur of:

•

the last day of the fiscal year following the fifth anniversary of this offering;

•

the last day of the first fiscal year in which our annual gross revenues exceed $1 billion;

•

the last day of the fiscal year in which we are deemed to be a “large accelerated filer” as defined in Rule 12b-2 under the Securities Exchange Act of 1934, as amended, or the Exchange Act, which would occur if the market value of our common stock held by non-affiliates exceeded $700 million as of the last business day of the second fiscal quarter of such fiscal year; or

•

the date on which we have issued more than $1 billion in non-convertible debt securities during the preceding three-year period.

Summary Risk Factors

An investment in our securities involves a high degree of risk. You should consider carefully the risks discussed below and described more fully along with other risks under “Risk Factors” in this prospectus before investing in our securities. Some of these risks are:

•

We have a limited operating history, have incurred significant operating losses since inception, including a deficit accumulated during the development stage of approximately $103.3 million as of September 30, 2014 and we expect to incur significant losses for the foreseeable future. We have generated no revenue from product sales and have never received regulatory approval to commercialize any of our product candidates. We may never become profitable or, if achieved, be able to sustain profitability.

•

Our business depends on the success of CVC, which is still under development. If we are unable to obtain regulatory approval for or successfully commercialize CVC, our business will be materially harmed.

•

The results of preclinical studies and early clinical trials are not always predictive of future results. Any product candidate we or any of our future development partners advance into clinical trials, including CVC, may not have favorable results in later clinical trials, if any, or receive regulatory approval.

•

If we encounter difficulties enrolling patients in our clinical trials, our clinical development activities could be delayed or otherwise adversely affected.

•

If we fail to obtain the capital necessary to fund our operations, we will be unable to successfully develop and commercialize CVC and other future product candidates.

•

Our success depends on our ability to protect our intellectual property and our proprietary technologies.

•

Our independent registered public accounting firm has included an explanatory paragraph indicating that our recurring net losses, working capital deficit and net capital deficiency raise substantial doubt on our ability to continue as a going concern in its report on our audited financial statements.

For further discussion of these and other risks you should consider before making an investment in our common stock, see “Risk Factors” immediately following this prospectus summary.

Corporate Information

We were incorporated in Delaware in September 2006. Our principal executive offices are located at 701 Gateway Blvd., Suite 300, South San Francisco, CA 94080 and our telephone number is (650) 741-6625. Our website address is www.tobiratherapeutics.com. We do not incorporate the information on, or accessible through, our website into this prospectus, and you should not consider any information on, or accessible through, our website as part of this prospectus.

Unless the context indicates otherwise, as used in this prospectus, the terms “Tobira,” “Company,” “we,” “us” and “our” refer to Tobira Therapeutics, Inc. The Tobira design logo and the marks “Tobira” and “Tobira Therapeutics” are the property of Tobira. This prospectus contains additional trade names, trademarks and service marks of ours and of other companies. We do not intend our use or display of other companies’ trade names, trademarks or service marks to imply a relationship with, or endorsement or sponsorship of us by, these other companies.

THE OFFERING

Common stock offered by us

shares.

Underwriters’ option

We have granted to the underwriters an option, exercisable for 30 days from the date of this prospectus, to purchase up to additional shares of common stock.

Common stock to be outstanding after this offering

shares (or shares, if the underwriters exercise their option to purchase additional shares in full).

Use of proceeds

We intend to use the net proceeds from this offering to fund the further development of CVC for the treatment of NASH, including a Phase 2b clinical trial currently enrolling patients, and other immuno-inflammatory and fibrosis indications, as well as for manufacturing of clinical drug supply, working capital and general corporate purposes. We estimate that the proceeds from this offering, together with our current resources, can fund operations through the primary endpoint of the CENTAUR study. Although we cannot specify with certainty the particular amounts or uses for the net proceeds from this offering, we currently intend to use approximately:

•

$ million for the development of CVC for the treatment of NASH including our Phase 2b clinical trial of CVC for the treatment of NASH,

•

$ million for other immuno-inflammatory and fibrosis indications,

•

$ million for manufacturing of clinical drug supply, and

•

the remainder for working capital and general corporate purposes.

Accordingly, our management will have broad discretion in using the net proceeds from this offering. See “Use of Proceeds.” We do not intend to use the net proceeds from this offering for our Phase 3 program for HIV-1 because we intend to advance this program only through a strategic collaboration or non-dilutive financing.

Risk factors

See “Risk Factors” beginning on page 11 and the other information included in this prospectus for a discussion of factors you should consider carefully before deciding to invest in our common stock.

NASDAQ Global Market symbol

TBRA

The number of shares of our common stock that will be outstanding after this offering is based on 7,066,148 shares of capital stock (on an as converted to common stock basis after giving effect to the transactions described below) outstanding as of September 30, 2014, and excludes:

•

925,940 shares of common stock issuable upon the exercise of options outstanding as of September 30, 2014, with a weighted-average exercise price of $6.22 per share,

•

1,736,601 shares of common stock reserved for future grant or issuance under our stock-based compensation plans, consisting of:

•

236,601 shares of common stock reserved for future grants under our 2010 Stock Plan and 2007 Stock Plan;

•

1,500,000 shares of common stock reserved for future grants under our 2014 Equity Incentive Plan, which became effective in May 2014 (subject to automatic annual adjustment in accordance with the terms of the plan), of which options to purchase 161,665 shares of common stock at an exercise price equal to the initial public offering price set forth on the cover of this prospectus will be granted coincident with this offering, of which 94,158 shares will be awarded to executive officers and 7,500 shares will be awarded to members of the board of directors; and

•

44,482 shares of common stock issuable upon the exercise of warrants issued to our term loan lenders at an exercise price of $14.50 per share.

Because the share amounts set forth above are based on shares of preferred stock and convertible notes outstanding as of September 30, 2014, such amounts do not take into account shares of common stock to be issued in satisfaction of accrued and unpaid interest on the convertible notes accrued after September 30, 2014 and through the closing date of this offering. Such interest accrues at a rate of approximately $0.2 million per month in the aggregate.

Unless otherwise indicated, all information in this prospectus assumes the following, which we refer to in this prospectus collectively as the “Transactions”:

•

that our restated certificate of incorporation, which we will file in connection with the completion of this offering, is in effect;

•

the conversion of all outstanding shares of our convertible preferred stock into an aggregate of 3,887,499 shares of common stock immediately prior to the completion of this offering, which conversion has been approved by the requisite stockholders;

•

the conversion of all principal and accrued and unpaid interest on convertible notes outstanding as of September 30, 2014 into an aggregate of 2,310,311 shares of stock immediately prior to the completion of this offering, which conversion has been approved by the requisite noteholders; and

•

no exercise by the underwriters of their option to purchase additional shares of common stock from us.

SUMMARY FINANCIAL DATA

We are a development stage company. The following tables set forth summary financial data. We derived the summary statements of operations data for the years ended December 31, 2012 and 2013 from our audited financial statements included elsewhere in this prospectus. The summary statement of operations data for the nine months ended September 30, 2013 and 2014 and the period from September 11, 2006 (inception) to September 30, 2014 and the summary balance sheet data as of September 30, 2014 were derived from our unaudited financial statements appearing elsewhere in this prospectus. The unaudited financial statements have been prepared on a basis consistent with our audited financial statements included in this prospectus and include, in our opinion, all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of the financial information in those statements. You should read this summary financial data in conjunction with the sections titled “Selected Financial Data” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our financial statements and related notes included elsewhere in this prospectus. Our historical results are not necessarily indicative of our results for any future period and results of interim periods are not necessarily indicative of the results for the entire year.


													Period from September 11, 2006 (Inception) Through September 30, 2014
	Years Ended December 31,						Nine Months Ended September 30,
(In thousands, except share and per share data)	2012			2013			2013			2014
							(unaudited)						(unaudited)
Statement of Operations and Comprehensive Loss Data:
Operating expenses
Research and development	$	13,757		$	12,413		$	10,497		$	8,274		$	73,979
General and administrative		3,250			2,764			2,151			2,754			22,483

Total operating expenses		17,007			15,177			12,648			11,028			96,462

Operating loss		(17,007	)		(15,177	)		(12,648	)		(11,028	)		(96,462	)
Other income (expense), net		(1,842	)		(3,412	)		(2,734	)		(2,387	)		(7,610	)

Loss before income tax benefit (expense)		(18,849	)		(18,589	)		(15,382	)		(13,415	)		(104,072	)
Income tax benefit (expense)		—			—			—			(271	)		726

Net loss and comprehensive loss	$	(18,849	)	$	(18,589	)	$	(15,382	)	$	(13,686	)	$	(103,346	)


Net loss per share, basic and diluted	$	(71.13	)	$	(67.66	)	$	(55.79	)	$	(48.50	)

Weighted-average common shares outstanding, basic and diluted		264,987			274,735			275,728			282,157


Pro-forma net loss per share, basic and diluted (unaudited)				$	(2.61	)				$	(1.68	)

Pro-forma weighted-average common shares outstanding, basic and diluted, (unaudited)⁽¹⁾					5,807,650						6,874,161

(1)

See Note 2 to our financial statements appearing elsewhere in this prospectus for an explanation of the calculation of basic and diluted net loss per common share and the number of shares used in the computation of the per share amounts.


	As of September 30, 2014
	Actual			Pro Forma⁽¹⁾			Pro Forma Adjusted⁽²⁾
	(unaudited)			(unaudited)			(unaudited)
(In thousands)
Balance Sheet Data:
Cash and cash equivalents	$	11,808		$	11,808
Working capital (deficit)		(24,934	)		8,142
Total assets		17,191			17,191
Convertible notes, related party⁽³⁾		29,576			—
Term loan		14,714			14,714
Preferred stock warrant liabilities		2,233			—
Convertible preferred stock		61,982			—
Deficit accumulated during development stage		(103,346	)		(103,444	)
Total stockholders’ deficit		(99,449	)		(2,157	)

(1)

Pro Forma amounts reflect (i) the automatic conversion of all outstanding shares of our Series A and Series B convertible preferred stock into 3,887,499 shares of common stock; (ii) the conversion of the convertible notes and accrued and unpaid interest into 2,310,311 shares of common stock; (iii) the exercise of 586,181 convertible preferred stock warrants at an exercise price of $14.50 per share; and (iv) the conversion of our outstanding convertible preferred stock warrants issued in connection with our term loans with Square 1 Bank and Oxford Finance LLC, or Oxford, into warrants to purchase 44,482 shares of common stock.

(2)

Pro Forma Adjusted amounts reflect the pro forma adjustments reflected in (1) above, as well as the sale of shares of our common stock in this offering at an assumed initial public offering price of $ per share (the mid-point of the price range set forth on the cover page of this prospectus), and after deducting the estimated underwriting discounts and commissions and estimated offering expenses payable by us.

(3)

Holders of convertible notes elected to convert principal and unpaid interest of the convertible notes into shares of Series B preferred stock contingent upon the completion of an initial public offering no later than June 30, 2015.

RISK FACTORS

Investing in our common stock involves a high degree of risk. You should consider carefully the risks and uncertainties described below, together with all of the other information in this prospectus, including our financial statements and related notes included elsewhere in this prospectus, before making an investment decision. If any of the following risks is realized, our business, financial condition, results of operations and prospects could be materially and adversely affected. In that event, the trading price of our common stock could decline and you could lose part or all of your investment.

Risks Related to our Business

We have limited operating history, have incurred significant operating losses since inception and we expect to incur significant losses for the foreseeable future. We may never become profitable or, if achieved, be able to sustain profitability.

We have incurred significant operating losses since we were founded in 2006 and expect to incur significant losses for the foreseeable future as we continue our clinical trial and development programs for cenicriviroc, or CVC, and other future product candidates. As of September 30, 2014, we had a deficit accumulated during the development stage of approximately $103.3 million. Losses have resulted principally from costs incurred in our clinical trials, research and development programs and from our general and administrative expenses. We have funded our operations primarily through the private placement of our equity securities and debt financing. During 2013 and the first nine months of 2014, we received net proceeds of $12.0 million and $8.0 million, respectively, from the issuance of convertible notes and warrants. In June 2014, we borrowed $15.0 million under our four-year term loan with Oxford. As of September 30, 2014, we had cash and cash equivalents of $11.8 million. In the future, we intend to continue to conduct research and development, clinical testing, regulatory compliance activities and, if CVC or other future product candidates is approved, sales and marketing activities that, together with anticipated general and administrative expenses, will likely result in our incurring further significant losses for the foreseeable future.

We currently generate no revenue from product sales, and we may never be able to commercialize CVC or other future product candidates. We do not currently have the required approvals to market CVC or any other future product candidates, and we may never receive them. We may not be profitable even if we or any of our future development partners succeed in commercializing any of our product candidates. Because of the numerous risks and uncertainties associated with developing and commercializing our product candidates, we are unable to predict the extent of any future losses or when we will become profitable, if at all.

CVC, a dual inhibitor of chemokine receptor type 2, or CCR2, and type 5, or CCR5, with anti-fibrotic effects in liver disease models and antiviral effects on HIV-1 has been the sole focus of our product development. Successful continued development and ultimate regulatory approval of CVC for nonalcoholic steatohepatitis, or NASH, is critical to the future success of our business. We have invested, and will continue to invest, a significant portion of our time and financial resources in the development of CVC. We will need to raise sufficient funds for, and successfully enroll and complete, our ongoing clinical development program for CVC in NASH. The future regulatory and commercial success of this product candidate is subject to a number of risks, including the following:

•

we may not have sufficient financial and other resources to complete the necessary clinical trials for CVC;

•

we may not be able to obtain adequate evidence of efficacy and safety for CVC in NASH, HIV or any other indication;

•

we do not know the degree to which CVC will be accepted as a therapy, even if approved;

•

in our clinical programs, we may experience variability in patients, adjustments to clinical trial procedures and the need for additional clinical trial sites, which could delay our clinical trial progress;

•

the results of our clinical trials may not meet the level of statistical or clinical significance required by the U.S. Food and Drug Administration, or FDA, or comparable foreign regulatory bodies for marketing approval;

•

patients in our clinical trials may die or suffer other adverse effects for reasons that may or may not be related to CVC, which could delay or prevent further clinical development;

•

the standards implemented by clinical or regulatory agencies may change at any time;

•

the FDA or foreign clinical or regulatory agencies may require efficacy endpoints for a Phase 3 clinical trial for the treatment of NASH that differ from the endpoints of our planned current or future trials, which may require us to conduct additional clinical trials;

•

the mechanism of action of CVC is complex and we do not know the degree to which it will translate into a medical benefit in NASH;

•

in the event an FDA-cleared tropism assay, a test to identify patients with HIV virus preferentially using CCR5, is unavailable at the time of CVC approval for HIV, we may be unable to develop, or contract with a third party to develop and obtain clearance for a companion diagnostic tropism assay to identify patients with CCR5-tropic virus which we expect will be necessary for the approval of CVC for HIV-1 infection as CVC is intended for use only in patients with CCR5-tropic virus;

•

if approved for NASH, CVC will likely compete with the off-label use of currently marketed products and other therapies in development; and

•

we may not be able to obtain, maintain or enforce our patents and other intellectual property rights.

Of the large number of drugs in development in the pharmaceutical industry, only a small percentage result in the submission of a new drug application, or NDA, to the FDA and even fewer are approved for commercialization. Furthermore, even if we do receive regulatory approval to market CVC, any such approval may be subject to limitations on the indicated uses or patient populations for which we may market the product. Accordingly, even if we are able to obtain the requisite financing to continue to fund our development programs, we cannot assure you that CVC will be successfully developed or commercialized. If we or any of our future development partners are unable to develop, or obtain regulatory approval for, or, if approved, successfully commercialize CVC, we may not be able to generate sufficient revenue to continue our business.

We do not intend to progress our HIV program unless we raise significant non-dilutive financing and/or identify a strategic partner who will fund the development and commercialization of CVC in HIV, which we might not achieve. We may not be able to secure such a strategic partner or non-dilutive financing.

We anticipate that future cash requirements to advance our HIV program will be significant and we plan to advance our HIV program in collaboration with a strategic partner or with non-dilutive financing. If we are not able to collaborate with a strategic partner or raise non-dilutive financing, we may be unable to initiate a Phase 3 program for CVC in HIV and may never be able to commercialize the use of CVC in HIV patients. Our ability to generate product revenues, which may not occur for several years, if ever, will depend in part on the successful development and commercialization of CVC in HIV. If we are unable to commercialize CVC in HIV or if we experience significant delays in advancing our HIV program, our business may be adversely affected.

Drug development has inherent risk. We or any of our future development partners will be required to demonstrate through adequate and well-controlled clinical trials that our product candidates are safe and effective,

with a favorable benefit-risk profile, for use in their target indications before we can seek regulatory approvals for their commercial sale. Clinical studies are expensive, difficult to design and implement, can take many years to complete and are uncertain as to outcome. Delay or failure can occur at any stage of development, including after commencement of any of our clinical trials. In addition, success in early clinical trials does not mean that later clinical trials will be successful, because later-stage clinical trials may be conducted in broader patient populations and involve different study designs. For instance, our Phase 3 clinical trials of CVC in HIV infection may differ substantially from the design of our Phase 2b clinical trial and our Phase 2b results may not be predictive of any future Phase 3 results. In addition, our planned initial Phase 3 program will evaluate CVC as a fixed-dose combination with 3TC rather than as a single agent as was done in the Phase 2b clinical trial. Furthermore, our future trials will need to demonstrate sufficient safety and efficacy in larger patient populations for approval by regulatory authorities. Companies frequently suffer significant setbacks in advanced clinical trials, even after earlier clinical trials have shown promising results. In addition, only a small percentage of drugs under development result in the submission of an NDA to the FDA and even fewer are approved for commercialization.

We cannot be certain that any of our ongoing or future clinical trials will be successful, and any safety concerns observed in any one of our clinical trials in our targeted indications could limit the prospects for regulatory approval of our product candidates in those and other indications.

Because CVC has not yet received regulatory approval, it is difficult to predict the time and cost of development and our ability to successfully complete clinical development and obtain the necessary regulatory approvals for commercialization.

CVC has not yet received regulatory approval for the treatment of NASH, and unexpected problems may arise that can cause us to delay, suspend or terminate our development efforts. Further, CVC has not yet demonstrated efficacy in humans for NASH, and the long-term safety consequences of dual inhibition of CCR2 and CCR5 receptors is not known. Regulatory approval of new product candidates such as CVC can be more expensive and take longer than approval for candidates for the treatment of more well understood diseases with previously approved products.

Any termination or suspension of, or delays in the commencement or completion of, our ongoing and planned clinical trials could result in increased costs to us, delay or limit our ability to generate revenue and adversely affect our commercial prospects.

In order to continue development of CVC, we will need to submit the results of clinical and preclinical testing to the FDA and other regulatory bodies, along with other information including information about product candidate chemistry, manufacturing and controls, clinical results and potential clinical trial protocols. We may rely in part on preclinical, clinical and quality data generated by contract research organizations, or CROs, and other third parties for regulatory submissions for our product candidates. If these third parties do not provide us with data in a timely manner, we will not be able to make timely regulatory submissions for our product candidates, which may delay our plans for our clinical trials. Furthermore, if those third parties do not make this data available to us, we will likely have to develop all necessary preclinical and clinical data on our own, which will lead to significant delays and increase development costs of the product candidate. Delays in the commencement or completion of our ongoing or future clinical trials for CVC or other future product candidates could significantly affect our product development costs. We do not know whether our current or planned trials will begin on time or be completed on schedule, if at all. The commencement and completion of clinical trials can be delayed for a number of reasons, including delays related to:

•

regulatory agencies failing to grant permission to proceed or placing the clinical trial on hold;

•

subjects failing to enroll or remain in our trial at the rate we expect;

•

subjects choosing an alternative treatment for the indication for which we are developing the product candidates, or participating in competing clinical trials;

•

lack of adequate funding to continue the clinical trial;

•

subjects experiencing severe or unexpected drug-related adverse effects;

•

a facility manufacturing our product candidate or any of its components being ordered by the FDA or other government or regulatory authorities to temporarily or permanently suspend operations due to violations of current good manufacturing practices, or GMP, regulations, or other applicable requirements;

•

any changes to our manufacturing process that may be necessary or desired;

•

third-party clinical investigators losing the licenses or permits necessary to perform our clinical trials, not performing our clinical trials on our anticipated schedule or consistent with the clinical trial protocol, GMP regulations or other regulatory requirements, or our CROs or other third parties not performing data collection or analysis in a timely or accurate manner;

•

inspections of clinical trial sites by the FDA or the finding of regulatory violations by the FDA or an institutional review board, or IRB, that require us to undertake corrective action, that results in suspension or termination of one or more sites or the imposition of a clinical hold on the entire trial or that prohibits us from using some or all of the data in support of our marketing applications;

•

third-party contractors becoming debarred or suspended or otherwise penalized by the FDA or other government or regulatory authorities for violations of regulatory requirements, in which case we may need to find a substitute contractor, and we may not be able to use some or all of the data produced by such contractors in support of our marketing applications; or

•

one or more IRBs refusing to approve, suspending or terminating the trial at an investigational site, precluding enrollment of additional subjects or withdrawing its approval of the trial.

Product development costs will increase if we have delays in testing or approval of CVC or if we need to perform more or larger clinical trials than planned. Additionally, changes in regulatory requirements and policies may occur, and we may need to amend clinical trial protocols to reflect these changes. Amendments may require us to resubmit our clinical trial protocols to IRBs for reexamination, which may impact the cost, timing or successful completion of a clinical trial. If we experience delays in completion of our clinical trials, or if we, the FDA or other regulatory authorities, IRBs, other reviewing entities or any of our clinical trial sites suspend or terminate any of our clinical trials, the commercial prospects for a product candidate may be harmed and our ability to generate product revenues will be delayed. In addition, many of the factors that cause, or lead to, termination or suspension of, or a delay in the commencement or completion of, clinical trials may also ultimately lead to the denial of regulatory approval of a product candidate. For instance, our initial clinical trial includes a staged approach to enrollment, increased monitoring of liver parameters and mandated stopping rules for suspected liver injury to address FDA concerns regarding the potential for hepatotoxicity of CVC in the setting of NASH. Further, if one or more clinical trials are delayed, our competitors may be able to bring products to market before we do, and the commercial viability of CVC or other future product candidates could be significantly reduced.

We have not yet determined the details of any potential Phase 3 trial designs, including identification of a primary endpoint that the FDA would deem acceptable in a study for the treatment of NASH. If the FDA determines that Phase 3 studies would require substantially different endpoints than those addressed in our ongoing or future clinical trials, we may need to conduct additional Phase 2 clinical trials of CVC.

If we encounter difficulties enrolling patients in our clinical trials, our clinical development activities could be delayed or otherwise adversely affected.

Patient enrollment, a significant factor in the timing of clinical trials, is affected by many factors including the size and nature of the patient population, the proximity of patients to clinical sites, the eligibility criteria for the trial, the design of the clinical trial, patient willingness to undergo a liver biopsy in our NASH trials, competing clinical trials and clinicians’ and patients’ perceptions as to the potential advantages and disadvantages of the product candidate being studied in relation to other available therapies, including any new

drugs that may be approved for the indications we are investigating. Potential patients for CVC may not be adequately diagnosed or identified with the diseases which we are targeting or may not meet the entry criteria for our studies.

We will be required to identify and enroll a sufficient number of patients with NASH for each of our ongoing and planned clinical trials of CVC in this indication. We also may encounter difficulties in identifying and enrolling NASH patients with a stage of disease appropriate for our ongoing or future clinical trials. We may not be able to initiate or continue clinical trials if we are unable to locate a sufficient number of eligible patients to participate in the clinical trials required by the FDA or other foreign regulatory agencies. In addition, the process of finding and diagnosing patients may prove costly. Our inability to enroll a sufficient number of patients for any of our clinical trials would result in significant delays or may require us to abandon one or more clinical trials.

Any product candidate in our current or future clinical trials may cause unacceptable adverse events or have other properties that may delay or prevent its regulatory approval or commercialization or limit its commercial potential.

Unacceptable adverse events caused by any of our product candidates in current or future clinical trials could cause us or regulatory authorities to interrupt, delay or halt clinical trials and could result in the denial of regulatory approval by the FDA or other regulatory authorities for any or all targeted indications and markets. This in turn could prevent us from completing development or commercializing the affected product candidate and generating revenue from its sale. If any of our product candidates cause unacceptable adverse events in clinical trials, we may not be able to obtain regulatory approval or commercialize such product candidate.

Our product candidates are subject to extensive regulation, compliance with which is costly and time consuming, and such regulation may cause unanticipated delays in, or prevent the receipt of the required approvals for, commercialization of our product candidates.

The clinical development, manufacturing, labeling, storage, record-keeping, advertising, promotion, import, export, marketing and distribution of our product candidates are subject to extensive regulation by the FDA in the United States and by comparable foreign regulatory agencies. In the United States, we are not permitted to market our product candidates until we receive regulatory approval from the FDA. The process of obtaining regulatory approval is expensive, often takes many years and can vary substantially based upon the type, complexity and novelty of the products involved, as well as the target indications and patient populations. The FDA may change its approval policies or regulations, and the FDA has substantial discretion in the drug approval process, including the ability to delay, limit or deny approval of a product candidate for many reasons. Despite the time and expense invested in clinical development of product candidates, regulatory approval is never guaranteed.

The FDA or comparable foreign regulatory authorities can delay, limit or deny approval of a product candidate for many reasons, including the following:

•

such authorities may disagree with the design or implementation of our or any of our future development partners’ clinical trials;

•

we or any of our future development partners may be unable to demonstrate to the satisfaction of the FDA or other regulatory authorities that a product candidate is safe and effective for any indication;

•

the results of clinical trials may not demonstrate the appropriateness of the dose or the safety or efficacy required by such authorities for approval;

•

we or any of our future development partners may be unable to demonstrate that a product candidate’s clinical and other benefits outweigh its safety risks;

•

such authorities may disagree with our interpretation or the quality of data from preclinical studies or clinical trials;

•

such authorities may find deficiencies in the manufacturing processes or facilities of third-party manufacturers with which we or any of our future development partners contract for clinical and commercial supplies; or

•

the approval policies or regulations of such authorities may significantly change in a manner rendering our or any of our future development partners’ clinical data insufficient for approval.

With respect to foreign markets, approval procedures vary among countries and, in addition to the aforementioned risks, can involve additional product testing, administrative review periods and agreements with pricing authorities. In addition, events raising questions about the safety of certain marketed pharmaceuticals may result in increased cautiousness by the FDA and comparable foreign regulatory authorities in reviewing new drugs based on safety, efficacy or other regulatory considerations and may result in significant delays in obtaining regulatory approvals. Any delay in obtaining, or inability to obtain, applicable regulatory approvals would prevent us or any of our future development partners from commercializing our product candidates.

Coverage and reimbursement may be limited or unavailable in certain market segments for CVC and other future product candidates, which could make it difficult for us to sell our product candidates profitably.

Market acceptance and sales of CVC and other future product candidates will depend significantly on the availability of adequate insurance coverage and reimbursement from third-party payors for any of our product candidates and may be affected by existing and future healthcare reform measures. Government authorities and third-party payors, such as private health insurers and health maintenance organizations, decide which drugs they will pay for and establish reimbursement levels. Reimbursement by a third-party payor may depend upon a number of factors including the third-party payor’s determination that use of a product candidate is:

•

a covered benefit under its health plan;

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safe, effective and medically necessary;

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appropriate for the specific patient;

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cost-effective; and

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neither experimental nor investigational.

Obtaining coverage and reimbursement approval for a product candidate from a government or other third-party payor is a time-consuming and costly process that could require us to provide supporting scientific, clinical and cost effectiveness data for the use of the applicable product candidate. We may not be able to provide data sufficient to gain acceptance with respect to coverage and reimbursement. We cannot be sure that coverage or adequate reimbursement will be available for any of our product candidates. Further, reimbursement amounts may not support the demand for, or the price of, our product candidates. If reimbursement is not available or is available only in limited levels, we may not be able to commercialize certain of our product candidates profitably, or at all, even if approved.

As a result of legislative proposals and the trend toward managed healthcare in the United States, third-party payors are increasingly attempting to contain healthcare costs by limiting both coverage and the level of reimbursement of new drugs. They may also refuse to provide coverage of approved product candidates for medical indications other than those for which the FDA has granted market approvals. As a result, significant uncertainty exists as to whether and how much third-party payors will reimburse patients for their use of newly approved drugs, which in turn may put pressure on the pricing of drugs or force prescribers to use generic drugs. We expect to experience pricing pressures in connection with the sale of our product candidates, if approved, due to the trend toward managed healthcare, the increasing influence of health maintenance organizations and additional legislative proposals as well as country, regional or local healthcare budget limitations.

Even if we obtain marketing approval for CVC or any other product candidate, it could be subject to restrictions or withdrawal from the market and will be subject to post-marketing requirements, and we may be subject to penalties if we fail to comply with regulatory requirements or if we experience unanticipated problems with our product candidates, when and if any of them are approved.

Even if U.S. regulatory approval is obtained, the FDA may still impose significant restrictions on a product’s indicated uses or marketing or impose ongoing requirements for potentially costly and time consuming post-approval studies, post-market surveillance or clinical trials. Following approval, if any, of CVC or any other product candidate, such candidate will also be subject to ongoing FDA requirements governing labeling, packaging, storage, distribution, safety surveillance, advertising, promotion, recordkeeping, reporting of safety and other post-market information, import and export. In addition, manufacturers of drug products and their facilities are subject to continual review and periodic inspections by the FDA and other regulatory authorities for compliance with GMP requirements relating to quality control, quality assurance and corresponding maintenance of records and documents. If we or a regulatory agency discovers previously unknown problems with a product, such as adverse events of unanticipated severity or frequency, or problems with the facility where the product is manufactured, a regulatory agency may impose restrictions on that product, the manufacturing facility or us, including requesting a recall or withdrawal of the product from the market or suspension of manufacturing.

If we or the manufacturing facilities for CVC, or any other product candidate that may receive regulatory approval, if any, fail to comply with applicable regulatory requirements, a regulatory agency may:

•

issue warning letters or untitled letters;

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seek an injunction or impose civil or criminal penalties or monetary fines;

•

suspend or withdraw regulatory approval;

•

suspend any ongoing clinical trials;

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refuse to approve pending applications or supplements or any subsequent applications or supplements we may file;

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suspend or impose restrictions on operations, including costly new manufacturing requirements; or

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seize or detain products, refuse to permit the import or export of products or request us to initiate a product recall.

The occurrence of any event or penalty described above may inhibit our ability to commercialize our product candidates and generate revenue.

The FDA has the authority to require a risk evaluation and mitigation strategy, or REMS, as part of a NDA or after approval, which may impose further requirements or restrictions on the distribution or use of a drug, such as limiting prescribing to certain physicians or medical centers that have undergone specialized training, limiting treatment to patients who meet certain safe-use criteria and requiring treated patients to enroll in a registry.

In addition, if CVC or any other future product candidates is approved, our product labeling, advertising and promotion would be subject to regulatory requirements and continuing regulatory review. The FDA strictly regulates the promotional claims that may be made about prescription products. In particular, a product may not be promoted for uses that are not approved by the FDA as reflected in the product’s approved labeling. If we receive marketing approval for a product candidate, physicians may nevertheless prescribe it to their patients in a manner that is inconsistent with the approved label. However, if we are found to have promoted such off-label uses, we may become subject to significant liability. The federal government has levied large civil and criminal fines against companies for alleged improper promotion and has enjoined several companies from engaging in off-label promotion. The FDA has also requested that companies enter into consent decrees or permanent injunctions under which specified promotional conduct is changed or curtailed. If we are deemed by the FDA to have engaged in the promotion of our products for off-label use, we could be subject to FDA prohibitions on the sale or marketing of our products or significant fines and penalties, and the imposition of these sanctions could also affect our reputation and position within the industry.

Even if we receive regulatory approval for CVC or any other product candidate, we still may not be able to successfully commercialize it, and the revenue that we generate from its sales, if any, could be limited.

Even if CVC or any other future product candidates receive regulatory approval, they may not gain market acceptance among physicians, patients, healthcare payors or the medical community. Coverage and reimbursement of our product candidates by third-party payors, including government payors, is also generally necessary for commercial success. The degree of market acceptance of our product candidates will depend on a number of factors, including:

•

demonstration of clinical efficacy and safety compared to other more-established products;

•

the limitation of our targeted patient population and other limitations or warnings contained in any FDA-approved labeling;

•

acceptance of a new formulation by healthcare providers and their patients;

•

the prevalence and severity of any adverse effects;

•

new procedures or methods of treatment that may be more effective in treating or may reduce the incidences of NASH or other conditions for which our products are intended to treat;

•

pricing and cost-effectiveness;

•

the effectiveness of our or any future collaborators’ sales and marketing strategies;

•

our ability to obtain and maintain sufficient third-party coverage or reimbursement from government healthcare programs, including Medicare and Medicaid, private health insurers and other third-party payors;

•

unfavorable publicity relating to the product candidate; and

•

the willingness of patients to pay out-of-pocket in the absence of third-party coverage.

If any product candidate is approved but does not achieve an adequate level of acceptance by physicians, hospitals, healthcare payors or patients, we may not generate sufficient revenue from that product candidate and may not become or remain profitable. Our efforts to educate the medical community and third-party payors on the benefits of CVC or any other future product candidates may require significant resources and may never be successful. In addition, our ability to successfully commercialize our product candidate will depend on our ability to manufacture our products, differentiate our products from competing products and defend and enforce our intellectual property rights relating to our products.

If the market opportunity for CVC for the treatment of NASH is smaller than we believe it is, our future revenue may be adversely affected, and our business may suffer.

If the size of the market opportunity for CVC in NASH is smaller than we anticipate, we may not be able to achieve profitability and growth. While we are initially targeting CVC for the treatment of NASH, a disease we believe to be one of the most prevalent chronic liver diseases worldwide, our projections of the number of people who have NASH, as well as the subset of people with the disease who have the potential to benefit from treatment with CVC, are based on our beliefs and estimates. These estimates have been derived from a variety of sources, including the scientific literature, surveys of clinics, patient foundations and market research and may prove to be incorrect. Further, new studies may change the estimated incidence or prevalence of this disease. The number of patients may turn out to be lower than expected. The effort to identify patients with the diseases we seek to treat is in early stages, and we cannot accurately predict the number of patients for whom treatment might be possible. For example, NASH is often undiagnosed and may be left undiagnosed for a long time. A definitive diagnosis of NASH is currently based on a histological assessment of a liver biopsy, which impacts the ability to easily identify patients. If improved diagnostic techniques for identifying NASH patients who will benefit from treatment are not developed, our market opportunity may be smaller than we currently anticipate. Additionally, the potentially addressable patient population may be limited or may not be amenable to treatment with CVC, and new patients may become increasingly difficult to identify or gain access to, which would adversely affect our results of operations and our business.

If we fail to develop and commercialize other product candidates, we may be unable to grow our business.

Although the development and commercialization of CVC is our primary focus, as part of our longer-term growth strategy, we plan to evaluate the development and commercialization of other therapies related to immune-mediated, inflammatory, orphan and other diseases. We will evaluate internal opportunities from our compound libraries, and also may choose to in-license or acquire other product candidates as well as commercial products to treat patients suffering from immune-mediated or orphan or other disorders with high unmet medical needs and limited treatment options. These other product candidates will require additional, time-consuming development efforts prior to commercial sale, including preclinical studies, clinical trials and approval by the FDA and/or applicable foreign regulatory authorities. All product candidates are prone to the risks of failure that are inherent in pharmaceutical product development, including the possibility that the product candidate will not be shown to be sufficiently safe and effective for approval by regulatory authorities. In addition, we cannot assure you that any such products that are approved will be manufactured or produced economically, successfully commercialized or widely accepted in the marketplace or be more effective than other commercially available alternatives.

We rely on third parties to conduct our clinical trials. If these third parties do not meet our deadlines or otherwise conduct the trials as required, our clinical development programs could be delayed or unsuccessful and we may not be able to obtain regulatory approval for or commercialize our product candidates when expected or at all.

We are dependent on third parties to conduct all of our clinical trials. Accordingly, the timing of the initiation and completion of these trials is controlled by such third parties and may occur at times substantially different from our estimates. Specifically, we use CROs to conduct our clinical trials and rely on medical institutions, clinical investigators, CROs and consultants to conduct our trials in accordance with our clinical protocols and regulatory requirements. Our CROs, investigators, and other third parties play a significant role in the conduct of these trials and subsequent collection and analysis of data.

There is no guarantee that any CROs, investigators, or other third parties on which we rely for administration and conduct of our clinical trials will devote adequate time and resources to such trials or perform as contractually required. If any of these third parties fails to meet expected deadlines, fails to adhere to our clinical protocols or otherwise performs in a substandard manner, our clinical trials may be extended, delayed or terminated. If any of our clinical trial sites terminates for any reason, we may experience the loss of follow-up information on subjects enrolled in our ongoing clinical trials unless we are able to transfer those subjects to another qualified clinical trial site. In addition, principal investigators for our clinical trials may serve as scientific advisors or consultants to us from time to time and may receive cash or equity compensation in connection with such services. If these relationships and any related compensation result in perceived or actual conflicts of interest, or if we fail to adequately disclose such compensation pursuant to FDA regulations, the integrity of the data generated at the applicable clinical trial site may be jeopardized.

We rely on third parties to supply the components of and manufacture CVC for our clinical trials and commercialization, which is a complex process. Our dependence on third parties could adversely impact our business.

We are dependent on third-parties to supply the components of and manufacture CVC. If these third-party suppliers do not supply sufficient quantities of materials to us on a timely basis and in accordance with applicable specifications, GMP regulations and other regulatory requirements, there could be a significant interruption of our supplies, which would adversely affect clinical development of the product candidate. Furthermore, if any of our contract manufacturers cannot successfully manufacture material that conforms to our specifications and within regulatory requirements, we will not be able to secure and/or maintain regulatory approval, if any, for our product candidates.

We will also rely on our contract manufacturers to purchase from third-party suppliers the materials necessary to produce our product candidates for our anticipated clinical trials. We do not have any control over

the process or timing of the acquisition of raw materials by our contract manufacturers. Moreover, we currently do not have agreements in place for the commercial production of these raw materials. Any significant delay in the supply of a product candidate or the raw material components thereof for an ongoing clinical trial could considerably delay completion of that clinical trial, product candidate testing and potential regulatory approval of that product candidate.

We do not expect to have the resources or capacity to commercially manufacture CVC or any other future product candidates, if approved, and will likely continue to be dependent on third-party manufacturers. Our dependence on third parties to manufacture and supply us with clinical trial materials and any approved product candidates may adversely affect our ability to develop and commercialize our product candidates on a timely basis.

The process of drug manufacturing is complex, highly regulated and subject to several risks, including:

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The manufacturing of compounds is complex, and only a limited number of manufacturers will be capable of manufacturing CVC and other future product candidates.

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The manufacturing of compounds is susceptible to product loss due to contamination, equipment failure, improper installation or operation of equipment or vendor or operator error. Even minor deviations from normal manufacturing processes could result in reduced production yields, product defects and other supply disruptions. If microbial, viral or other contaminations are discovered in our products or in the manufacturing facilities in which our products are made, such manufacturing facilities may need to be closed for an extended period of time to investigate and remedy the contamination.

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The manufacturing facilities in which CVC and other future product candidates are made could be adversely affected by labor shortages, natural disasters, power failures and numerous other factors.

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We and our contract manufacturers must comply with GMP regulations and guidelines. Although we are ultimately responsible for ensuring that our product candidates are manufactured in accordance with GMP regulations and guidance, we are not involved in the day-to-day operations of our contract manufacturers. We and our contract manufacturers may encounter difficulties in achieving quality control and quality assurance and may experience shortages in qualified personnel. We and our contract manufacturers are subject to inspections by the FDA and comparable agencies in other jurisdictions to confirm compliance with applicable regulatory requirements. Any failure to follow GMP or other regulatory requirements or any delay, interruption or other issues that arise in the manufacture, fill-finish, packaging or storage of our products as a result of a failure of our facilities or the facilities or operations of third parties to comply with regulatory requirements or pass any regulatory authority inspection could significantly impair our ability to develop and commercialize our product candidates, including leading to significant delays in the availability of product candidates for our clinical studies or the termination or hold on a clinical study or the delay or prevention of filing or approval of marketing applications for our product candidates. Significant noncompliance could also result in the imposition of sanctions, including warning or untitled letters, fines, injunctions, civil penalties, failure of regulatory authorities to grant marketing approvals for our product candidates, delays, suspension or withdrawal of approvals, license revocation, seizures or recalls of products, operating restrictions and criminal prosecutions, any of which could be costly and damage our reputation. If we are not able to maintain regulatory compliance, we may not be permitted to market our product candidates and/or may be subject to product recalls, seizures, injunctions, or criminal prosecution.

Any adverse developments affecting manufacturing operations for our products may result in shipment delays, inventory shortages, lot failures, product withdrawals or recalls, or other interruptions in the supply of our products. We may also have to take inventory write-offs and incur other charges and expenses for products that fail to meet specifications, undertake costly remediation efforts or seek more costly manufacturing alternatives.

We may not be successful in establishing and maintaining development or other strategic partnerships, which could adversely affect our ability to develop and commercialize product candidates.

We may choose to enter into development or other strategic partnerships in the future, including collaborations with major biotechnology or pharmaceutical companies. For example, we intend to pursue a Phase 3 clinical trial of CVC for the treatment of HIV in collaboration with a strategic partner. The negotiation process for a collaboration of this type is time consuming and complex. We may not be successful in our efforts to establish a development partnership or other alternative arrangements for any of our product candidates and programs. Even if we are successful in our efforts to establish development partnerships, the terms that we agree upon may not be favorable to us, and we may not be able to maintain such development partnerships if, for example, development or approval of a product candidate is delayed or sales of an approved product candidate are disappointing. Any delay in entering into development partnership agreements related to our product candidates could delay the development and commercialization of our product candidates and reduce their competitiveness if they reach the market.

In addition, our strategic partners may terminate any agreements they enter into with us, and we may not be able to adequately protect our rights under these agreements. Furthermore, our strategic partners will likely negotiate for certain rights to control decisions regarding the development and commercialization of our product candidates, if approved, and may not conduct those activities in the same manner as we do.

Moreover, if we fail to maintain development or other strategic partnerships related to our product candidates that we may choose to enter into, then:

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the development of certain of our current or future product candidates may be terminated or delayed;

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our cash expenditures related to development of certain of our current or future product candidates would increase significantly, and we may need to seek additional financing;

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we may be required to hire additional employees or otherwise develop expertise, such as sales and marketing expertise, for which we have not budgeted; and

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we will bear all of the risk related to the development of any such product candidates.

We may form strategic alliances in the future, and we may not realize the benefits of such alliances.

We may form strategic alliances, create joint ventures or collaborations or enter into licensing arrangements with third parties that we believe will complement or augment our existing business, including for the continued development or commercialization of CVC or other future product candidates. These relationships or those like them may require us to incur non-recurring and other charges, increase our near- and long-term expenditures, issue securities that dilute our existing stockholders or disrupt our management and business. In addition, we face significant competition in seeking appropriate strategic partners and the negotiation process is time-consuming and complex. We cannot be certain that, following a strategic transaction or license, we will achieve the revenues or specific net income that justifies such transaction.

If our competitors develop treatments for the target indications of our product candidates that are approved more quickly than ours, marketed more successfully or demonstrated to be safer or more effective than our product candidates, our commercial opportunity will be reduced or eliminated.

We operate in highly competitive segments of the biotechnology and biopharmaceutical markets. We face competition from many different sources, including commercial pharmaceutical and biotechnology enterprises, academic institutions, government agencies and private and public research institutions. Our product candidates, if successfully developed and approved, may compete with established therapies as well as with new treatments that may be introduced by our competitors. Many of our competitors have significantly greater financial, product candidate development, manufacturing and marketing resources than we do. Large pharmaceutical and biotechnology companies have extensive experience in clinical testing and obtaining regulatory approval for drugs. In addition, universities and private and public research institutes may be active in research in our target indications, and they or their licensees could be in direct competition with us. We also may compete with these

organizations to recruit management, scientists and clinical development personnel. We will also face competition from these third parties in establishing clinical trial sites, registering subjects for clinical trials and in identifying and in-licensing new product candidates. Smaller or early-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies. Additionally, we may face competition from developing countries, where costs may be cheaper.

New developments, including the development of other pharmaceutical technologies and methods of treating disease, occur in the pharmaceutical and life sciences industries at a rapid pace. Developments by competitors may render our product candidates obsolete or noncompetitive. Competition in drug development is intense. We anticipate that we will face intense and increasing competition as new treatments enter the market and advanced technologies become available.

There are currently no therapeutic products approved for the treatment of NASH. There are several commercially available products that are currently used off label for NASH, such as vitamin E (an antioxidant), insulin sensitizers (such as metformin), antihyperlipidemic agents (such as gemfibrozil), pentoxifylline, ursodiol and others. In addition, there are numerous drugs in development for the treatment of NASH. We are aware of several companies that have product candidates in clinical development for the treatment of NASH, including Intercept Pharmaceuticals, Inc., Gilead Sciences, Inc., Galectin Therapeutics Inc., Galmed Medical Research Ltd., Genfit Corp., Novartis AG, Novo Nordisk A/S, Takeda, Raptor Pharmaceutical Corp., Immuron Ltd., Shire plc and Conatus Pharmaceuticals Inc., and there are other companies with candidates in earlier stage development.

In HIV, we are aware of several companies that market therapies, including single tablet regimen Atripla, Complera, Stribild and Triumeq (commercialized by Bristol-Myers Squibb Company, Gilead Sciences Inc., Janssen Pharmaceuticals Inc. and ViiV Healthcare), NRTI backbones Truvada and Epzicom (commercialized by Gilead Sciences Inc. and ViiV Healthcare) and multiple single agent products in the integrase inhibitor, protease inhibitor and NNRTI class, as well as CCR5 inhibitor maraviroc (commercialized by ViiV Healthcare). Other companies are also developing novel HIV therapies and vaccines.

Even if we obtain regulatory approval for our product candidates, the availability and price of our competitors’ products could limit the demand or the price we are able to charge, for our product candidates. Several generic products are already available and more will become available for the indications we are targeting with our product candidates. Our business will be harmed if the acceptance of our product candidates is inhibited by price competition or the reluctance of physicians to switch from existing methods of treatment to our product candidates, or if physicians switch to other new drug products or choose to reserve our product candidates for use in limited circumstances. Our inability to compete with existing or subsequently introduced drug products would have a material adverse impact on our business.

We have no sales, marketing, reimbursement or distribution capabilities, and we will have to invest significant resources to develop these capabilities.

We have no internal sales, marketing, reimbursement or distribution capabilities. If CVC or any other future product candidates ultimately receives regulatory approval, we may not be able to effectively market and distribute the product candidate. We will have to invest significant amounts of financial and management resources to develop internal sales, distribution and marketing capabilities, some of which will be committed prior to any confirmation that CVC or any other future product candidates will be approved, if at all. We may not be able to hire consultants or external service providers to assist us in sales, marketing, reimbursement and distribution functions on acceptable financial terms or at all. Even if we decide to establish sales, marketing, reimbursement and distribution functions, we could face a number of additional related risks, including the following:

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we may not be able to attract and build an effective marketing department or sales force;

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the cost of establishing a marketing department or sales force may exceed our available financial resources and the revenues generated by CVC or any other product candidates that we may develop, in-license or acquire; and

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our direct sales, reimbursement and marketing efforts may not be successful.

If we lose key scientists or management personnel, or if we fail to recruit additional highly skilled personnel, it will impair our ability to identify, develop and commercialize products.

We are highly dependent on principal members of our management team and scientific staff, including our Chief Executive Officer, Laurent Fischer, M.D., and our Chief Medical Officer, Éric Lefebvre, M.D. These executives each have significant pharmaceutical industry experience. The loss of any member of our management team or scientific staff, including Drs. Fischer and Lefebvre, would impair our ability to identify, develop and market new products. Our management and other employees may voluntarily terminate their employment with us at any time. The loss of the services of these or other key personnel, or the inability to attract and retain additional qualified personnel, could result in delays to development or approval, loss of sales and diversion of management resources. In addition, we depend on our ability to attract and retain other highly skilled personnel. Competition for qualified personnel is intense, and the process of hiring and integrating such qualified personnel is often lengthy. We may be unable to recruit such personnel on a timely basis, if at all, which would negatively impact our development and commercialization programs.

Additionally, we do not currently maintain “key person” life insurance on the lives of our executives or any of our employees. This lack of insurance means that we may not receive adequate compensation for the loss of the services of these individuals.

If we fail to effectively integrate our new executive officers into our organization, the future development and commercialization of our product candidates may suffer, harming future regulatory approvals, sales of our product candidates or our results of operations.

Our current management team has only been working together for a relatively short period of time and our Chief Executive Officer and Chief Financial Officer have been employed by us for less than a year. Moreover, we expect to continue to expand our team in the future. Our future performance will depend, in part, on our ability to successfully integrate recently and subsequently hired executive officers into our management team and their ability to develop and maintain an effective working relationship. Our failure to integrate these individuals with other members of management could result in inefficiencies or failures in the development and commercialization of our product candidates.

We may encounter difficulties in managing our growth and expanding our operations successfully.

As of September 30, 2014, we had 13 full-time employees. We will need to grow our organization substantially to continue development and pursue the potential commercialization of CVC and other future product candidates, as well as function as a public company. As we seek to advance CVC and other product candidates, we will need to expand our financial, development, regulatory, manufacturing, marketing and sales capabilities or contract with third parties to provide these capabilities for us. As our operations expand, we expect that we will need to manage additional relationships with various strategic partners, suppliers and other third parties. Future growth will impose significant added responsibilities on members of management and require us to retain additional internal capabilities. Our future financial performance and our ability to commercialize our product candidates and to compete effectively will depend, in part, on our ability to manage any future growth effectively. To that end, we must be able to manage our development efforts and clinical trials effectively and hire, train and integrate additional management, clinical and regulatory, financial, administrative and sales and marketing personnel. We may not be able to accomplish these tasks, and our failure to so accomplish could prevent us from successfully growing our company.

Recently enacted and future legislation may increase the difficulty and cost for us to obtain marketing approval of and commercialize our product candidates and may affect the prices we may obtain.

In the United States and some foreign jurisdictions, there have been a number of legislative and regulatory changes and proposed changes regarding healthcare systems that could prevent or delay marketing approval for our product candidates, restrict or regulate post-approval activities and affect our ability to profitably sell our product candidates.

Legislative and regulatory proposals have been made to expand post-approval requirements and restrict sales and promotional activities for pharmaceutical products. We are not sure whether additional legislative changes will be enacted, or whether the FDA or other agency regulations, guidance or interpretations will be changed, or what the impact of such changes on the marketing approvals of our product candidates, if any, may be. In addition, increased scrutiny by the United States Congress of the FDA’s approval process may significantly delay or prevent marketing approval, as well as subject us to more stringent product labeling and post-marketing testing and other requirements.

In the United States, the Medicare Modernization Act of 2003, or MMA, changed the way Medicare covers and pays for pharmaceutical products. The legislation expanded Medicare coverage for outpatient prescription drug purchases by the elderly with a new Part D program. In addition, this legislation authorized Medicare Part D prescription drug plans to use formulas where they can limit the number of drugs that will be covered in any therapeutic class. Notwithstanding the expansion of federal coverage of drug products, there is pressure to contain and reduce costs.

More recently, in March 2010, President Obama signed into law the Patient Protection and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act, or collectively, the Affordable Care Act, which is a sweeping law intended to broaden access to health insurance, reduce or constrain the growth of healthcare spending, enhance remedies against fraud and abuse, add new transparency requirements for healthcare and health insurance industries, impose new taxes and fees on the health industry and impose additional health policy reforms. The Affordable Care Act, among other things:

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imposed a non-deductible annual fee on pharmaceutical manufacturers or importers who sell “branded prescription drugs”;

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increased the minimum level of Medicaid rebates payable by manufacturers of brand-name drugs from 15.1% to 23.1%;

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expanded the 340B drug discount program;

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required collection of rebates for drugs paid by Medicaid managed care organizations;

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revised the definition of “average manufacturer price” for Medicaid drug rebate reporting purposes, which could increase the amount of Medicaid drug rebates due to states;

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required manufacturers to participate in a coverage gap discount program, under which they must agree to offer 50% point-of-sale discounts off negotiated prices of applicable brand drugs to eligible beneficiaries during their coverage gap period, as a condition for the manufacturer’s outpatient drugs to be covered under Medicare Part D; and

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mandated a further shift in the burden of Medicaid payments to the states.

Although it is too early to determine the full effect of the Affordable Care Act on our business, the law appears likely to continue the pressure on pharmaceutical pricing, especially under Medicare, and may also increase our regulatory burdens and operating costs.

Other legislative changes have been proposed and adopted since the Affordable Care Act was enacted. On August 2, 2011, the President signed into law the Budget Control Act of 2011, which, among other things, created the Joint Select Committee on Deficit Reduction to recommend proposals in spending reductions to Congress. The Joint Select Committee did not achieve its targeted deficit reduction of at least $1.2 trillion for the

years 2013 through 2021, triggering the legislation’s automatic reductions to several government programs. These reductions include aggregate reductions to Medicare payments to providers, managed care organizations, and prescription drug plan sponsors, of 2% per fiscal year, which went into effect on April 1, 2013.

There likely will continue to be legislative and regulatory proposals at the federal and state levels directed at containing or lowering the cost of healthcare. We cannot predict the initiatives that may be adopted in the future or their full impact. The continuing efforts of the government, insurance companies, managed care organizations and other payors of healthcare services to contain or reduce costs of healthcare may adversely affect:

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the demand for any product candidates for which we may obtain regulatory approval;

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our ability to set a price that we believe is fair for our product candidates;

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our ability to generate revenue and achieve or maintain profitability;

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the level of taxes that we are required to pay; and

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the availability of capital.

If we fail to comply with healthcare regulations, we could face substantial penalties and our business, results of operations and financial condition could be adversely affected.

Certain federal and state healthcare laws and regulations pertaining to fraud and abuse and patients’ rights are and will be applicable to our business. We could be subject to healthcare fraud and abuse and patient privacy laws and regulations by both the federal government and the states in which we conduct our business. Because of the breadth of these laws and the narrowness of the safe harbors, it is possible that some of our business activities could be subject to challenge under one or more of these laws. The regulations that may affect our ability to operate include, without limitation:

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The federal False Claims Act, which prohibits, among other things, individuals or entities from knowingly presenting, or causing to be presented, false claims, or knowingly using false statements, to obtain payment from the federal government, and which may apply to entities that provide coding and billing advice to customers;

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The federal Anti-Kickback Statute, which prohibits, among other things, any person from knowingly and willfully offering, paying, soliciting or receiving remuneration to induce, or in return for, purchasing, leasing, ordering or arranging for the purchase, lease or order of any healthcare item or service reimbursable under Medicare, Medicaid or other federally financed healthcare programs. This statute has been interpreted to apply to arrangements between pharmaceutical manufacturers on the one hand and prescribers, purchasers and formula managers on the other;

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federal criminal laws that prohibit executing a scheme to defraud any healthcare benefit program or making false statements relating to healthcare matters;

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the federal Health Insurance Portability and Accountability Act of 1996, or HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act, and its implementing regulations, which governs the conduct of certain electronic healthcare transactions and protects the security and privacy of protected health information; and

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state law equivalents of each of the above federal laws, such as anti-kickback and false claims laws which may apply to items or services reimbursed by any third-party payor, including commercial insurers.

Although there are several statutory exemptions and regulatory safe harbors protecting certain common activities from prosecution under the Anti-Kickback Statute, the exemptions and safe harbors are drawn narrowly, and practices that involve remuneration intended to induce prescribing, purchasing or recommending may be subject to scrutiny if they do not qualify for an exemption or safe harbor. We have consulting arrangements with physicians who provide various services to us. Payment for some of these consulting services is not made on a per-hour basis. Our practices may not in all cases meet all of the criteria for safe harbor protection from anti-kickback liability.

Recent legislation has strengthened the above laws. The Affordable Care Act, among other things, amends the intent requirement of the Federal Anti-Kickback Statute and criminal healthcare fraud statutes. A person or entity no longer needs to have actual knowledge of this statute or specific intent to violate it. In addition, the Affordable Care Act provides that the government may assert that a claim including items or services resulting from a violation of the federal Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the False Claims Act.

The Affordable Care Act also imposes new reporting and disclosure requirements on drug manufacturers for any “transfer of value” made or distributed to prescribers and other healthcare providers. In addition, drug manufacturers will also be required to report and disclose any investment interests held by physicians and their immediate family members during the preceding calendar year. Failure to submit required information may result in civil monetary penalties of up to an aggregate of $150,000 per year (and up to an aggregate of $1.0 million per year for “knowing failures”), for all payments, transfers of value or ownership or investment interests not reported in an annual submission.

In addition, there has been a recent trend of increased federal and state regulation of payments made to physicians for marketing. Some states mandate implementation of compliance programs and/or the tracking and reporting of gifts, compensation, and other remuneration to physicians. The need to build and maintain a robust compliance program with different compliance and/or reporting requirements increases the possibility that a healthcare company may violate one or more of the requirements.

If our operations are found to be in violation of any of the laws described above or any other governmental laws and regulations that apply to us, we may be subject to penalties, including civil and criminal penalties, damages, fines, exclusion from participation in government healthcare programs, such as Medicare and Medicaid, imprisonment, and the curtailment or restructuring of our operations, any of which could adversely affect our ability to operate our business and our financial results. Any action against us for violation of these laws, even if we successfully defend against it, could cause us to incur significant legal expenses and divert our management’s attention from the operation of our business. Moreover, achieving and sustaining compliance with applicable federal and state privacy, security and fraud laws may prove costly.

Governments may impose price controls, which may adversely affect our future profitability.

We intend to seek approval to market our product candidates in both the United States and in foreign jurisdictions. If we obtain approval in one or more foreign jurisdictions, we will be subject to rules and regulations in those jurisdictions relating to our product candidates. In many foreign countries the pricing of prescription pharmaceuticals is subject to governmental control. In these countries, pricing negotiations with governmental authorities can take considerable time after the receipt of marketing approval for a product candidate. If reimbursement of our future products is unavailable or limited in scope or amount, or if pricing is set at unsatisfactory levels, we may be unable to achieve or sustain profitability.

If product liability lawsuits are brought against us, we may incur substantial liabilities and may be required to limit commercialization of CVC or other future product candidates.

We face an inherent risk of product liability as a result of the clinical testing of CVC and other future product candidates and will face an even greater risk if we commercialize our product candidates. For example, we may be sued if CVC or our other product candidates allegedly cause injury or are found to be otherwise unsuitable during product testing, manufacturing, marketing or sale. Any such product liability claims may include allegations of defects in manufacturing, defects in design, a failure to warn of dangers inherent in the product candidate, negligence, strict liability and a breach of warranties. Claims could also be asserted under state consumer protection acts.

If we cannot successfully defend ourselves against product liability claims, we may incur substantial liabilities or be required to limit or cease the commercialization of our product candidates. Even a successful

defense would require significant financial and management resources. Regardless of the merits or eventual outcome, liability claims may result in:

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decreased demand for CVC or our other product candidates;

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injury to our reputation;

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withdrawal of clinical trial participants;

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costs to defend the related litigation;

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a diversion of management’s time and our resources;

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substantial monetary awards to trial participants or patients;

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product recalls, withdrawals or labeling, marketing or promotional restrictions;

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loss of revenue;

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the inability to commercialize CVC or our other product candidates; and

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a decline in our stock price.

We maintain clinical trial insurance with $10.0 million in coverage in the United States and local policies in other countries, which we believe is sufficient to cover foreseeable claims that may be made against us and is customary for similarly situated companies in our industry. However, we cannot be certain that such insurance will be sufficient to cover all claims that may be made against us and any claim that may be brought against us could result in a court judgment or settlement in an amount that is not covered, in whole or in part, by our insurance or that is in excess of the limits of our insurance coverage. Our insurance policies also have various exclusions, and we may be subject to a claim for which we have no coverage. We may have to pay any amounts awarded by a court or negotiated in a settlement that exceed our coverage limitations or that are not covered by our insurance, and we may not have, or be able to obtain, sufficient capital to pay such amounts. Furthermore, our inability to obtain and retain sufficient clinical trial insurance at an acceptable cost to protect against potential liability claims could prevent or inhibit the commercialization of CVC or our other product candidates.

Our term loan with Oxford contains restrictions that may limit our flexibility in operating our business.

In June 2014, we entered into a loan and security agreement with Oxford Finance LLC, or Oxford, pursuant to which we borrowed an aggregate principal amount of $15.0 million. Amounts outstanding under the term loan are secured by all of our existing and future assets, excluding intellectual property unless otherwise determined by applicable judicial authority. The agreement contains various covenants that require Oxford’s approval to engage in specified types of transactions. These covenants require approval to, among other things:

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incur or assume certain debt;

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merge or consolidate;

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change the nature of our business;

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dispose of certain assets;

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grant liens on our assets including our intellectual property;

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make certain investments;

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pay dividends; and

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enter into material transactions with affiliates.

A breach of any of these covenants or a material adverse change to our business could result in a default under the loan. In the case of an event of default under the loan, Oxford could elect to declare all amounts outstanding to be immediately due and payable, commence and prosecute bankruptcy and/or other insolvency proceedings, or proceed against the collateral granted to Oxford as security for the loan.

We and any of our future development partners will be required to report to regulatory authorities if any approved products cause or contribute to adverse events, and any failure to do so would result in sanctions that would materially harm our business.

If we and any of our future development partners are successful in commercializing our products, the FDA and foreign regulatory authorities would require that we and any of our future development partners report certain information about adverse medical events if those products may have caused or contributed to those adverse events. The timing of our obligation to report would be triggered by the date we become aware of the adverse event as well as the nature of the event. We and any of our future development partners may fail to report adverse events we become aware of within the prescribed timeframe or we may fail to receive notice of such events from our CROs within the prescribed time period. We and any of our future development partners may also fail to appreciate that we have become aware of a reportable adverse event, especially if it is not reported to us as an adverse event or if it is an adverse event that is unexpected or removed in time from the use of our products. If we and any of our future development partners fail to comply with our reporting obligations, the FDA or a foreign regulatory authority could take action, including criminal prosecution, the imposition of civil monetary penalties, seizure of our products or delay in approval of future products.

Our internal computer systems, or those of our development partners, third-party CROs or other contractors or consultants, may fail or suffer security breaches, which could result in a material disruption of our product development programs.

Despite the implementation of security measures, our internal computer systems and those of our current and any future CROs and other contractors, consultants and collaborators are vulnerable to damage from computer viruses, unauthorized access, natural disasters, terrorism, war and telecommunication and electrical failures. While we have not experienced any such material system failure, accident or security breach to date, if such an event were to occur and cause interruptions in our operations, it could result in a material disruption of our development programs and our business operations. For example, the loss of clinical trial data from completed or future clinical trials could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. Likewise, we rely on third parties to manufacture our product candidates and conduct clinical trials, and similar events relating to their computer systems could also have a material adverse effect on our business. To the extent that any disruption or security breach were to result in a loss of, or damage to, our data or applications, or inappropriate disclosure of confidential or proprietary information, we could incur liability and the further development and commercialization of our product candidate could be delayed.

Business disruptions could seriously harm our future revenues and financial condition and increase our costs and expenses.

Our operations could be subject to earthquakes, power shortages, telecommunications failures, water shortages, floods, hurricanes, fires, extreme weather conditions, medical epidemics and other natural or manmade disasters or business interruptions, for which we are predominantly self-insured. The occurrence of any of these business disruptions could seriously harm our operations and financial condition and increase our costs and expenses. We rely on third-party manufacturers to produce CVC and our other product candidates. Our ability to obtain clinical supplies of CVC or our other product candidates could be disrupted if the operations of these suppliers are affected similarly.

Risks Relating to Our Intellectual Property

Our rights to develop and commercialize our product candidates are subject in part to the terms and conditions of a license to CVC granted to us by Takeda.

CVC is based in part on patents that we have licensed on an exclusive basis and other intellectual property licensed from Takeda Pharmaceutical Company Limited, or Takeda. Takeda holds certain rights with respect to CVC in the license agreement. This license imposes various commercial, contingent payment, royalty, insurance, indemnification, and other obligations on us. If we fail to comply with these obligations, the licensor may have the right to terminate the license, in which event we would lose valuable rights under our collaboration agreements and our ability to develop product candidates.

Either party may terminate the license agreement under certain circumstances, including a material breach of the agreement by the other. In the event we terminate our license, or if Takeda terminates our license due to our breach, all rights to CVC, including any intellectual property we develop with respect to CVC or licensed or developed by us under this agreement will revert or otherwise be licensed back to Takeda on an exclusive basis. Any termination or reversion to Takeda of our rights to develop or commercialize CVC, including any reacquisition by Takeda of our rights, will have a material adverse effect on our business.

We may fail to comply with any of our obligations under existing agreements pursuant to which we license rights or technology, which could result in the loss of rights or technology that are material to our business.

We are a party to a license agreement with Takeda that is important to our business, and we may enter into additional licenses in the future. Under our agreement from Takeda, Takeda has assigned and licensed to us certain patents and know-how relating to CVC. This license agreement imposes various commercial, contingent payment, royalty, insurance, indemnification, and other obligations on us. If we fail to comply with these obligations, Takeda may have the right to terminate the license agreement, in which event we would lose valuable rights to CVC and would be unable to develop or market CVC.

With respect to certain patents under our license agreement with Takeda and in some cases with respect to any license we may enter into in the future, patent prosecution of our licensed technology is controlled solely by the licensor. If our licensors fail to obtain and maintain patent or other protection for the proprietary intellectual property we license from them, we could lose our rights to the intellectual property or our exclusivity with respect to those rights, and our competitors could market competing products using the intellectual property. In certain cases, including with respect to the patents assigned to us from Takeda, we control the prosecution of patents resulting from licensed or assigned technology. In the event we breach any of our obligations related to such prosecution, we may incur significant liability to our licensing partners. Licensing of intellectual property is of critical importance to our business and involves complex legal, business, and scientific issues. Disputes may arise regarding intellectual property subject to a licensing agreement, including but not limited to:

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the scope of rights granted under the license agreement and other interpretation-related issues;

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the extent to which our technology and processes infringe on intellectual property of the licensor that is not subject to the licensing agreement;

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the sublicensing of patent and other rights;

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our diligence obligations under the license agreement and what activities satisfy those diligence obligations;

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the ownership of inventions and know-how resulting from the joint creation or use of intellectual property by our licensors and us and our collaborators; and

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the priority of invention of patented technology.

If disputes over intellectual property and other rights that we have licensed or acquired from third parties prevent or impair our ability to maintain our current licensing arrangements on acceptable terms, we may be unable to successfully develop and commercialize the affected product candidates.

Our success depends on our ability to protect our intellectual property and our proprietary technologies.

Our commercial success depends in part on our ability to obtain and maintain patent protection and trade secret protection for our product candidates, proprietary technologies, and their uses as well as our ability to operate without infringing upon the proprietary rights of others. We can provide no assurance that our patent applications or those of our licensors will result in additional patents being issued or that issued patents will afford sufficient protection against competitors with similar technology, nor can there be any assurance that the patents issued will not be infringed, designed around or invalidated by third parties. Even issued patents may later be found unenforceable or may be modified or revoked in proceedings instituted by third parties before various patent offices or in courts. The degree of future protection for our proprietary rights is uncertain. Only limited protection may be available and may not adequately protect our rights or permit us to gain or keep any competitive advantage. This failure to properly protect the intellectual property rights relating to our product candidates could have a material adverse effect on our financial condition and results of operations.

Composition-of-matter patents on the biological or chemical active pharmaceutical ingredient are generally considered to be the strongest form of intellectual property and provide the broadest scope of patent protection for pharmaceutical products, as such patents provide protection without regard to any method of use. While we have issued composition-of-matter patents in the United States and other countries for CVC, we cannot be certain that the claims in our issued composition-of-matter patents will not be found invalid or unenforceable if challenged. We cannot be certain that the claims in our patent applications covering composition-of-matter or formulations of our other product candidates will be considered patentable by the United States Patent and Trademark Office, or USPTO, and courts in the United States or by the patent offices and courts in foreign countries, nor can we be certain that the claims in our issued composition-of-matter patents will not be found invalid or unenforceable if challenged. Even if our patent applications covering formulations of our product candidates issue as patents, the formulation patents protect a specific formulation of a product and may not be enforced against competitors making and marketing a product that has the same active pharmaceutical ingredient in a different formulation. Method-of-use patents protect the use of a product for the specified method or for treatment of a particular indication. This type of patent may not be enforced against competitors making and marketing a product that has the same active pharmaceutical ingredient but used for a method not included in the patent. Moreover, even if competitors do not actively promote their product for our targeted indications, physicians may prescribe these products “off-label.” Although off-label prescriptions may infringe or contribute to the infringement of method-of-use patents, the practice is common and such infringement is difficult to prevent or prosecute.

Our issued composition of matter patents for CVC are expected to expire in the United States as early as 2023. Our additional patents and pending patent applications that cover formulations, combination products and use of CVC to treat various indications are expected to expire at various times that range from 2023 (for issued patents) to potentially 2035 (for currently-filed provisional patent applications if patents were to issue on non-provisional applications filed thereon).

The patent application process is subject to numerous risks and uncertainties, and there can be no assurance that we or any of our future development partners will be successful in protecting our product candidates by obtaining and defending patents. These risks and uncertainties include the following:

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the USPTO and various foreign governmental patent agencies require compliance with a number of procedural, documentary, fee payment and other provisions during the patent process. There are situations in which noncompliance can result in abandonment or lapse of a patent or patent application, resulting in partial or complete loss of patent rights in the relevant jurisdiction. In such an event, competitors might be able to enter the market earlier than would otherwise have been the case;

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patent applications may not result in any patents being issued;

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patents that may be issued or in-licensed may be challenged, invalidated, modified, revoked, circumvented, found to be unenforceable or otherwise may not provide any competitive advantage;

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our competitors, many of whom have substantially greater resources than we do and many of whom have made significant investments in competing technologies, may seek or may have already obtained patents that will limit, interfere with or eliminate our ability to make, use, and sell our potential product candidates;

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there may be significant pressure on the U.S. government and international governmental bodies to limit the scope of patent protection both inside and outside the United States for disease treatments that prove successful, as a matter of public policy regarding worldwide health concerns; and

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countries other than the United States may have patent laws less favorable to patentees than those upheld by U.S. courts, allowing foreign competitors a better opportunity to create, develop and market competing product candidates.

In addition, we rely on the protection of our trade secrets and proprietary know-how. Although we have taken steps to protect our trade secrets and unpatented know-how, including entering into confidentiality agreements with third parties, and confidential information and inventions agreements with employees, consultants and advisors, we cannot provide any assurances that all such agreements have been duly executed, and third parties may still obtain this information or may come upon this or similar information independently. Additionally, if the steps taken to maintain our trade secrets are deemed inadequate, we may have insufficient recourse against third parties for misappropriating our trade secrets. If any of these events occurs or if we otherwise lose protection for our trade secrets or proprietary know-how, our business may be harmed.

Recent patent reform legislation could increase the uncertainties and costs surrounding the prosecution of our patent applications and the enforcement or defense of our issued patents.

On September 16, 2011, the Leahy-Smith America Invents Act, or the Leahy-Smith Act, was signed into law. The Leahy-Smith Act includes a number of significant changes to U.S. patent law. These include provisions that affect the way patent applications will be prosecuted and may also affect patent litigation. In particular, under the Leahy-Smith Act, the United States transitioned in March 2013 to a ‘‘first to file’’ system in which the first inventor to file a patent application will be entitled to the patent. Third parties are allowed to submit prior art before the issuance of a patent by the USPTO, in which case a patent may become subject to post-grant proceedings including opposition, derivation, reexamination, inter-partes review or interference proceedings challenging our patent rights or the patent rights of others. An adverse determination in any such submission, proceeding or litigation could reduce the scope or enforceability of, or invalidate, our patent rights, which could adversely affect our competitive position.

Claims by third parties that we infringe their proprietary rights may result in liability for damages or prevent or delay our developmental and commercialization efforts.

The biotechnology industry has been characterized by frequent litigation regarding patent and other intellectual property rights. Numerous U.S. and foreign issued patents and pending patent applications, which are owned by third parties, exist in the fields in which we are developing product candidates. As the biotechnology industry expands and more patents are issued, the risk increases that our product candidates may be subject to claims of infringement of the patent rights of third parties. Because patent applications are maintained in secrecy until the application is published, we may be unaware of third party patents that may be infringed by commercialization of CVC or our other product candidates. Moreover, because patent applications can take many years to issue, there may be currently-pending patent applications that may later result in issued patents that our product candidates may infringe. In addition, identification of third party patent rights that may be relevant to our technology is difficult because patent searching is imperfect due to differences in terminology among patents,

incomplete databases and the difficulty in assessing the meaning of patent claims. Any claims of patent infringement asserted by third parties would be time consuming and could likely:

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result in costly litigation;

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divert the time and attention of our technical personnel and management;

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cause development delays;

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prevent us from commercializing CVC or our other product candidates until the asserted patent expires or is held finally invalid or not infringed in a court of law;

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require us to develop non-infringing technology, which may not be possible on a cost-effective basis; or

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require us to enter into royalty or licensing agreements.

Although no third party has asserted a claim of patent infringement against us as of the date of this prospectus, others may hold proprietary rights that could prevent CVC or our other product candidates from being marketed. Any patent-related legal action against us claiming damages and seeking to enjoin commercial activities relating to our product candidate or processes could subject us to potential liability for damages and require us to obtain a license to continue to manufacture or market CVC or our other product candidates. We cannot predict whether we would prevail in any such actions or that any license required under any of these patents would be made available on commercially acceptable terms, if at all. In addition, we cannot be sure that we could redesign our product candidate or processes to avoid infringement, if necessary. Accordingly, an adverse determination in a judicial or administrative proceeding, or the failure to obtain necessary licenses, could prevent us from developing and commercializing CVC or our other product candidates, which could harm our business, financial condition and operating results.

Moreover, we may be subject to a third party preissuance submission of prior art to the USPTO or in addition to interference proceedings, may become involved in opposition, derivation, reexamination, inter partes review, post-grant review or other post-grant proceedings challenging our patent rights or the patent rights of others. An adverse determination in any such submission, proceeding or litigation could reduce the scope of, or invalidate, our patent rights, allow third parties to commercialize our technology or products and compete directly with us, without payment to us, or result in our inability to manufacture or commercialize products without infringing third party patent rights. In addition, if the breadth or strength of protection provided by our patents and patent applications is threatened, it could dissuade companies from collaborating with us to license, develop or commercialize current or future product candidates.

We may be involved in lawsuits to protect or enforce our patents or the patents of our licensors, which could be expensive, time consuming, and unsuccessful. Further, our issued patents could be found invalid or unenforceable if challenged in court.

If we or any of our future development partners were to initiate legal proceedings against a third party to enforce a patent directed at one of our product candidates, or one of our future product candidates, the defendant could counterclaim that our patent is invalid and/or unenforceable. In patent litigation in the United States, defendant counterclaims alleging invalidity and/or unenforceability are commonplace. Grounds for a validity challenge could be an alleged failure to meet any of several statutory requirements, including lack of novelty, obviousness, non-enablement or insufficient written description. Grounds for an unenforceability assertion could be an allegation that someone connected with prosecution of the patent withheld relevant information from the USPTO or made a misleading statement during prosecution. Third parties may also raise similar claims before the USPTO, even outside the context of litigation. The outcome following legal assertions of invalidity and unenforceability is unpredictable. With respect to the validity question, for example, we cannot be certain that there is no invalidating prior art of which we and the patent examiner were unaware during prosecution. If a defendant were to prevail on a legal assertion of invalidity and/or unenforceability, we would lose at least part, and perhaps all, of the patent protection on such product candidate. Such a loss of patent protection would have a material adverse impact on our business.

Interference proceedings provoked by third parties or brought by us or declared by the USPTO may be necessary to determine the priority of inventions with respect to our patents or patent applications or those of our licensors. An unfavorable outcome could require us to cease using the related technology or to attempt to license rights to it from the prevailing party. Our business could be harmed if the prevailing party does not offer us a license on commercially reasonable terms. Our defense of litigation or interference proceedings may fail and, even if successful, may result in substantial costs and distract our management and other employees. In addition, the uncertainties associated with litigation could have a material adverse effect on our ability to raise the funds necessary to continue our clinical trials, continue our research programs, license necessary technology from third parties, or enter into development partnerships that would help us bring our product candidates to market.

Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could be compromised by disclosure during this type of litigation. There could also be public announcements of the results of hearings, motions, or other interim proceedings or developments. If securities analysts or investors perceive these results to be negative, it could have a material adverse effect on the price of our common stock.

We may not be successful in obtaining or maintaining necessary rights to our product candidates through acquisitions and in-licenses.

We currently have rights to the intellectual property, through licenses from third parties and under patents that we own, to develop our product candidates. Because our programs may require the use of proprietary rights held by third parties, the growth of our business may depend in part on our ability to acquire, in-license, or use these proprietary rights. For example, our product candidates may require specific formulations to work effectively and efficiently and the rights to these formulations may be held by others. We may be unable to acquire or in-license any compositions, methods of use, processes, or other third-party intellectual property rights from third parties that we identify as necessary for our product candidates. The licensing and acquisition of third-party intellectual property rights is a competitive area, and a number of more established companies are also pursuing strategies to license or acquire third-party intellectual property rights that we may consider attractive. These established companies may have a competitive advantage over us due to their size, cash resources, and greater clinical development and commercialization capabilities. In addition, companies that perceive us to be a competitor may be unwilling to assign or license rights to us. We also may be unable to license or acquire third-party intellectual property rights on terms that would allow us to make an appropriate return on our investment.

We may collaborate with U.S. and foreign academic institutions to accelerate our preclinical or clinical research. Typically, these institutions provide us with an option to negotiate a license to any of the institution’s rights in technology resulting from the collaboration. Regardless of such option, we may be unable to negotiate a license within the specified timeframe or under terms that are acceptable to us. If we are unable to do so, the institution may offer the intellectual property rights to other parties, potentially blocking our ability to pursue our program.

If we are unable to successfully obtain rights to required third-party intellectual property rights or maintain the existing intellectual property rights we have, we may have to abandon development of that program and our business and financial condition could suffer.

We may be subject to claims that we have wrongfully hired an employee from a competitor or that we or our employees have wrongfully used or disclosed alleged confidential information or trade secrets of their former employers.

As is common in the biotechnology and pharmaceutical industry, we engage the services of consultants, in addition to our employees, to assist us in the development of our product candidates. Many of these employees and consultants, and many of our employees, were previously employed at, or may have previously provided or may be currently providing consulting services to, other biotechnology or pharmaceutical companies including

our competitors or potential competitors. We may become subject to claims that our company, our employees or a consultant inadvertently or otherwise used or disclosed trade secrets or other information proprietary to their former employers or their former or current clients. Litigation may be necessary to defend against these claims. If we fail in defending any such claims, in addition to paying monetary damages, we may lose valuable intellectual property rights or personnel, which could adversely impact our business. Even if we are successful in defending against these claims, litigation could result in substantial costs and be a distraction to our management team.

Our reliance on third parties requires us to share our trade secrets, which increases the possibility that a competitor will discover them or that our trade secrets will be misappropriated or disclosed.

Because we rely on third parties to research and develop and to manufacture our product candidates, we must, at times, share trade secrets with them. We seek to protect our proprietary technology in part by entering into confidentiality agreements and, if applicable, material transfer agreements, consulting agreements or other similar agreements with our advisors, employees, third-party contractors and consultants prior to beginning research or disclosing proprietary information. These agreements typically limit the rights of the third parties to use or disclose our confidential information, including our trade secrets. Despite the contractual provisions employed when working with third parties, the need to share trade secrets and other confidential information increases the risk that such trade secrets become known by our competitors, are inadvertently incorporated into the technology of others, or are disclosed or used in violation of these agreements. Given that our proprietary position is based, in part, on our know-how and trade secrets, a competitor’s discovery of our trade secrets or other unauthorized use or disclosure would impair our competitive position and may have a material adverse effect on our business.

In addition, these agreements typically restrict the ability of our advisors, employees, third-party contractors and consultants to publish data potentially relating to our trade secrets, although our agreements may contain certain limited publication rights. For example, any academic institution that we may collaborate with in the future will usually expect to be granted rights to publish data arising out of such collaboration, provided that we are notified in advance and given the opportunity to delay publication for a limited time period in order for us to secure patent protection of intellectual property rights arising from the collaboration, in addition to the opportunity to remove confidential or trade secret information from any such publication. In the future we may also conduct joint research and development programs that may require us to share trade secrets under the terms of our research and development or similar agreements. Despite our efforts to protect our trade secrets, our competitors may discover our trade secrets, either through breach of our agreements with third parties, independent development or publication of information by any of our third-party collaborators. A competitor’s discovery of our trade secrets would impair our competitive position and have an adverse impact on our business.

If we do not obtain protection under the Hatch-Waxman Amendments by extending the patent terms for CVC or our other product candidates, our business may be materially harmed.

Depending upon the timing, duration and specifics of FDA marketing approval of CVC or other product candidates, one or more of our United States patents may be eligible for limited patent term restoration under the Drug Price Competition and Patent Term Restoration Act of 1984, referred to as the Hatch-Waxman Amendments. The Hatch-Waxman Amendments permit a patent restoration term of up to five years as compensation for patent term lost during product development and the FDA regulatory review process. However, we may not be granted an extension because of, for example, failing to apply within applicable deadlines, failing to apply prior to expiration of relevant patents or otherwise failing to satisfy applicable requirements. Moreover, the applicable time period or the scope of patent protection afforded could be less than we request. If we are unable to obtain patent term extension or restoration or the term of any such extension is less than we request, our competitors may obtain approval of competing products following our patent expiration, and our revenue could be reduced, possibly materially.

If our trademarks and trade names are not adequately protected, then we may not be able to build name recognition in our markets of interest and our business may be adversely affected.

Our registered or unregistered trademarks or trade names may be challenged, infringed, circumvented or declared generic or determined to be infringing on other marks. We may not be able to protect our rights to these trademarks and trade names, which we need to build name recognition among potential partners or customers in our markets of interest. At times, competitors may adopt trade names or trademarks similar to ours, thereby impeding our ability to build brand identity and possibly leading to market confusion. In addition, there could be potential trade name or trademark infringement claims brought by owners of other registered trademarks or trademarks that incorporate variations of our registered or unregistered trademarks or trade names. Over the long term, if we are unable to establish name recognition based on our trademarks and trade names, then we may not be able to compete effectively and our business may be adversely affected. Our efforts to enforce or protect our proprietary rights related to trademarks, trade secrets, domain names, copyrights or other intellectual property may be ineffective and could result in substantial costs and diversion of resources and could adversely impact our financial condition or results of operations.

We may not be able to protect our intellectual property rights throughout the world.

While we have issued composition-of-matter patents directed at CVC in the United States and other countries, filing, prosecuting and defending patents on CVC and our other product candidates in all countries throughout the world would be prohibitively expensive, and our intellectual property rights in some countries outside the United States can be less extensive than those in the United States. In addition, the laws of some foreign countries may not protect intellectual property rights to the same extent as federal and state laws in the United States. Consequently, we may not be able to prevent third parties from practicing our inventions in all countries outside the United States, or from selling or importing products made using our inventions in and into the United States or other jurisdictions. Competitors may use our technologies in jurisdictions where we have not obtained patent protection to develop their own products and, further, may export otherwise infringing products to territories where we have patent protection but enforcement is not as strong as that in the United States. These products may compete with our product candidates, and our patents or other intellectual property rights may not be effective or sufficient to prevent them from competing.

Many companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal systems of certain countries, particularly certain developing countries, do not favor the enforcement of patents and other intellectual property protection, particularly those relating to biopharmaceuticals, which could make it difficult for us to stop the infringement of our patents or marketing of competing products in violation of our proprietary rights generally. For example, India and China have compulsory licensing laws under which a patent owner may be compelled to grant licenses to third parties. Although we currently do not have issued patents in these particular jurisdictions, to the extent we are able to obtain such patents, we may have limited remedies if our patents are infringed or if we are compelled to grant a license to a third party. Proceedings to enforce our patent rights in foreign jurisdictions could result in substantial costs and divert our efforts and attention from other aspects of our business, could put our patents at risk of being invalidated or interpreted narrowly and our patent applications at risk of not issuing and could provoke third parties to assert claims against us. We may not prevail in any lawsuits that we initiate, and the damages or other remedies awarded, if any, may not be commercially meaningful. Accordingly, our efforts to enforce our intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual property that we develop or license.

Risks Related to Our Financial Position and Need for Capital

Our independent registered public accounting firm has included an explanatory paragraph relating to our ability to continue as a going concern in its report on our audited financial statements.

Our independent registered public accounting firm included an explanatory paragraph in its report on our financial statements for the year ended December 31, 2013 stating that our recurring net losses, working capital deficit and net capital deficiency at December 31, 2013 raise substantial doubt about our ability to continue as a going concern. If we are unable to obtain sufficient funding, our business, prospects, financial condition and results of operations will be materially and adversely affected and we may be unable to continue as a going concern. If we are unable to continue as a going concern, we may have to liquidate our assets and may receive less than the value at which those assets are carried on our financial statements, and it is likely that investors will lose all or a part of their investment. We may also be forced to make reductions in spending, including delaying or curtailing our ongoing or future clinical programs, or to extend payment terms with our suppliers or licensors. Future reports from our independent registered public accounting firm may also contain statements expressing doubt about our ability to continue as a going concern. If we seek additional financing to fund our business activities in the future and there remains doubt about our ability to continue as a going concern, investors or other financing sources may be unwilling to provide additional funding on commercially reasonable terms or at all.

If we fail to obtain the capital necessary to fund our operations, we will be unable to successfully develop and commercialize CVC and other future product candidates.

Although we believe that the anticipated net proceeds from this offering, together with our existing cash and cash equivalents, will be sufficient to fund our current operations through at least the second quarter of 2016, we will require substantial future capital in order to complete the remaining clinical development for CVC and our other product candidates and to potentially commercialize these product candidates. In particular, in order to initiate our Phase 3 clinical program for CVC in HIV we will need to collaborate with a strategic partner or raise significant non-dilutive financing. We expect our spending levels to increase in connection with our clinical trials of CVC, as well as other corporate activities. The amount and timing of any expenditure needed to implement our development and commercialization programs will depend on numerous factors, including:

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the type, number, scope, progress, expansion costs, results of and timing of our ongoing or future clinical trials or the need for additional clinical trials of CVC for NASH or any of our other product candidates which we are pursuing or may choose to pursue in the future;

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the costs of obtaining, maintaining and enforcing our patents and other intellectual property rights;

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the costs and timing of obtaining or maintaining manufacturing for CVC for NASH and any of our other product candidates, including commercial manufacturing if any product candidate is approved;

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the costs and timing of establishing sales marketing, and reimbursement capabilities and enhanced internal controls over financial reporting;

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the terms and timing of establishing and maintaining collaborations, license agreements and other partnerships;

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costs associated with any new product candidates that we may develop, in-license or acquire;

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the effect of competing technological and market developments; and

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the costs associated with being a public company.

Some of these factors are outside of our control. We do not expect our existing capital resources together with the net proceeds from this offering to be sufficient to enable us to fund the completion of our clinical trials and commercialization of our product candidates. We expect that we will need to raise additional funds in the future.

We have not sold any products, and we do not expect to sell or derive revenue from any product sales for the foreseeable future. We may seek additional funding through future debt and equity financing, as well as potential additional collaborations or strategic partnerships with other companies or through non-dilutive financings. Additional funding may not be available to us on acceptable terms or at all. In addition, the terms of any financing may adversely affect the holdings or the rights of our stockholders. In addition, the issuance of additional shares by us, or the possibility of such issuance, may cause the market price of our shares to decline.

If we are unable to obtain funding on a timely basis, we will be unable to complete ongoing and planned clinical trials for CVC for NASH and any of our other product candidates and we may be required to significantly curtail some or all of our activities. We also could be required to seek funds through arrangements with collaborative partners or otherwise that may require us to relinquish rights to our product candidates or some of our technologies or otherwise agree to terms unfavorable to us.

Our ability to use net operating loss and tax credit carryforwards and certain built-in losses to reduce future tax payments may be limited by provisions of the Internal Revenue Code, and may be subject to further limitation as a result of the transactions contemplated by this offering.

As of December 31, 2013, we had federal and state tax net operating loss carryforwards of approximately $75.3 million and $28.8 million, respectively, which begin to expire in 2023 for federal and 2015 for state unless previously utilized. As of December 31, 2013, we had federal and California research and development tax credit carryforwards of approximately $0.7 million and $0.2 million, respectively. The federal research and development tax credit carryforwards will begin expiring in 2033 unless previously utilized. The California research and development tax credit carryforwards are available indefinitely until utilized.

Under Section 382 of the Internal Revenue Code of 1986, as amended, if a corporation undergoes an “ownership change” (generally defined as a greater than 50% change (by value) in its equity ownership over a three year period), the corporation’s ability to use its pre-change net operating loss carryforwards and other pre-change tax attributes to offset its post-change income may be limited. Similar rules may apply under state tax laws. We have not performed a detailed analysis to determine whether an ownership change under Section 382 of the Code, or similar state provisions, has previously occurred or will occur as a result of this offering. As a result, if we earn net taxable income, our ability to use our pre-change net operating loss carryforwards to offset U.S. federal taxable income may become subject to limitations, which could potentially result in increased future tax liability to us.

Risks Related to Our Common Stock and this Offering

An active trading market for our common stock may not develop.

Prior to this offering, there has been no public market for our common stock. We cannot assure you that an active trading market for our shares will develop or be sustained following this offering. If the market does not develop or is not sustained, it may be difficult for you to sell your shares of common stock at a price that is attractive to you or at all. In addition, an inactive market may impair our ability to raise capital by selling shares and may impair our ability to acquire other companies or technologies by using our shares as consideration, which, in turn, could materially adversely affect our business.

The trading price of the shares of our common stock could be highly volatile, and purchasers of our common stock could incur substantial losses.

Our stock price is likely to be volatile. The stock market in general and the market for biotechnology companies in particular have experienced extreme volatility that has often been unrelated to the operating performance of particular companies. As a result of this volatility, investors may not be able to sell their common stock at or above the initial public offering price. The market price for our common stock may be influenced by many factors, including:

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our ability to enroll patients in our ongoing or future clinical trials;

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results of the clinical trials, and the results of trials of our competitors or those of other companies in our market sector;

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regulatory developments in the United States and foreign countries;

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variations in our financial results or those of companies that are perceived to be similar to us;

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changes in the structure of healthcare payment systems, especially in light of current reforms to the U.S. healthcare system;

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announcements by us or our competitors of significant acquisitions, strategic partnerships, joint ventures or capital commitments;

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our ability to enter into strategic partnerships for the development of our product candidates;

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market conditions in the pharmaceutical and biotechnology sectors and issuance of securities analysts’ reports or recommendations;

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sales of our stock by insiders and stockholders;

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trading volume of our common stock;

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general economic, industry and market conditions other events or factors, many of which are beyond our control;

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additions or departures of key personnel; and

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intellectual property, product liability or other litigation against us.

In addition, in the past, stockholders have initiated class action lawsuits against biotechnology and pharmaceutical companies following periods of volatility in the market prices of these companies’ stock. Such litigation, if instituted against us, could cause us to incur substantial costs and divert management’s attention and resources, which could have a material adverse effect on our business, financial condition and results of operations.

Our quarterly operating results may fluctuate significantly.

We expect our operating results to be subject to quarterly fluctuations. Our net loss and other operating results will be affected by numerous factors, including:

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variations in the level of expenses related to our clinical trial and development programs;

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addition or termination of clinical trials;

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regulatory developments affecting CVC and our other product candidates;

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our execution of any collaborative, licensing or similar arrangements and the timing of payments we may make or receive under these arrangements; and

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nature and terms of stock-based compensation grants and any intellectual property infringement lawsuit in which we may become involved.

If our quarterly operating results fall below the expectations of investors or securities analysts, the price of our common stock could decline substantially. Furthermore, any quarterly fluctuations in our operating results may, in turn, cause the price of our stock to fluctuate substantially.

If securities or industry analysts do not publish research or reports or publish unfavorable research or reports about our business, our stock price and trading volume could decline.

The trading market for our common stock will depend in part on the research and reports that securities or industry analysts publish about us, our business, our market or our competitors. We do not currently have and may

never obtain research coverage by securities and industry analysts. If no securities or industry analysts commence coverage of our company, the trading price for our stock would be negatively impacted. In the event we obtain securities or industry analyst coverage, if one or more of the analysts who covers us downgrades our stock, our stock price would likely decline. If one or more of these analysts ceases to cover us or fails to regularly publish reports on us, interest in our stock could decrease, which could cause our stock price or trading volume to decline.

We may use the net proceeds from this offering in ways that you and other stockholders may not approve.

Our management will have broad discretion in the application of the net proceeds from this offering, including for any of the purposes described in the section entitled “Use of Proceeds,” and you will not have the opportunity as part of your investment decision to assess whether the net proceeds are being used appropriately. Because of the number and variability of factors that will determine our use of the net proceeds from this offering, their ultimate use may vary substantially from their currently intended use. Our management might not apply our net proceeds in ways that ultimately increase the value of your investment. We intend to use the net proceeds from this offering to fund the development of CVC for the treatment of NASH, including the Phase 2b CENTAUR clinical trial that we are currently enrolling, and other immuno-inflammatory and fibrosis indications, as well as for manufacturing of clinical drug supply, working capital and general corporate purposes. We do not intend to use the net proceeds from this offering for our Phase 3 program for HIV-1 because we intend to advance this program through a strategic collaboration or non-dilutive financing. The failure by our management to apply the net proceeds from this offering effectively could harm our business. Pending their use, we may invest the net proceeds from this offering in short- and intermediate-term, interest-bearing obligations, investment-grade instruments, certificates of deposit or direct or guaranteed obligations of the U.S. government. These investments may not yield a favorable return to our stockholders.

You will suffer immediate and substantial dilution in the net tangible book value of the common stock you purchase.

The initial public offering price of our common stock is substantially higher than the pro forma as adjusted net tangible book value per share of our outstanding common stock immediately after the completion of this offering. Purchasers of common stock in this offering will experience immediate dilution of approximately $ per share, assuming an initial public offering price of $ per share, the midpoint of the range set forth on the cover of this prospectus. In the past, we issued options and warrants to acquire common stock at prices significantly below the initial public offering price. To the extent these outstanding options and warrants are ultimately exercised, investors purchasing common stock in this offering will sustain further dilution. For a further description of the dilution that you will experience immediately after this offering, see “Dilution.”

Sales of a substantial number of shares of our common stock by our existing stockholders in the public market could cause our stock price to fall.

Sales of a substantial number of shares of our common stock in the public market or the perception that these sales might occur, could significantly reduce the market price of our common stock and impair our ability to raise adequate capital through the sale of additional equity securities.

Upon the closing of this offering, we will have outstanding a total of shares of common stock after this offering, assuming no exercise of the underwriters’ option to purchase additional shares and no exercise of options and warrants outstanding immediately following the consummation of this offering. Of these shares, the shares of common stock sold in this offering by us, plus any shares sold upon exercise of the underwriters’ option to purchase additional shares, will be freely tradable without restriction in the public market immediately following this offering, unless they are purchased by one of our affiliates.

We and our executive officers, directors and stockholders have agreed, subject to certain exceptions, not to engage in sales or dispositions of, or other transactions relating to, our common stock or securities convertible

into or exercisable or exchangeable for our common stock or warrants or other rights to acquire shares of our common stock. These “lock-up” restrictions end 180 days after the date of this prospectus. However, Leerink Partners LLC may permit persons who are subject to these lock-up agreements to sell shares prior to the expiration of the lock-up agreements.

After the lock-up agreements expire, up to an additional shares of common stock will be eligible for sale in the public market of which shares are held by directors, executive officers and other affiliates and will be subject to volume limitations under Rule 144 under the Securities Act of 1933, as amended, or the Securities Act. In addition, shares of common stock that are either subject to outstanding options or reserved for future issuance under our employee benefit plans will become eligible for sale in the public market to the extent permitted by the provisions of various vesting schedules, the lock-up agreements and Rule 144 and Rule 701 under the Securities Act. If these additional shares of common stock are sold, or if it is perceived that they will be sold, in the public market, the trading price of our common stock could decline.

Certain holders of shares of our common stock will be entitled to rights with respect to the registration of their shares under the Securities Act, subject to the 180-day lock-up agreements described above. See “Description of Capital Stock—Registration Rights.” Registration of these shares under the Securities Act would result in the shares becoming freely tradable without restriction under the Securities Act, except for shares held by affiliates, as defined in Rule 144 under the Securities Act. Any sales of securities by these stockholders could have a material adverse effect on the trading price of our common stock.

Future sales and issuances of our common stock or rights to purchase common stock pursuant to our equity incentive plans could result in additional dilution of the percentage ownership of our stockholders and could cause our share price to fall.

We expect that significant additional capital will be needed in the future to continue our planned operations. To the extent we raise additional capital by issuing equity securities, our stockholders may experience substantial dilution. We may sell common stock, convertible securities or other equity securities in one or more transactions at prices and in a manner we determine from time to time. If we sell common stock, convertible securities or other equity securities in more than one transaction, investors may be materially diluted by subsequent sales. Such sales may also result in material dilution to our existing stockholders, and new investors could gain rights superior to our existing stockholders.

As of September 30, 2014, we had an aggregate of 925,940 options outstanding under our 2010 Stock Plan and 2007 Stock Plan, an aggregate of 236,601 shares of common stock reserved for future grants under our 2010 Stock Plan and 2007 Stock Plan and 1,500,000 shares of common stock reserved for future grants under our 2014 Equity Incentive Plan. We plan to register the number of shares issuable upon outstanding awards and available for future grants under our 2010 Stock Plan and our 2007 Stock Plan as well as the number of shares issuable upon outstanding awards and available for issuance under our 2014 Equity Incentive Plan. Sales of shares granted under our equity incentive plans or upon exercise of warrants may result in material dilution to our existing stockholders, which could cause our share price to fall.

We do not intend to pay dividends on our common stock, and, consequently, your ability to achieve a return on your investment will depend on appreciation, if any, in the price of our common stock.

We have never declared or paid any cash dividend on our common stock and do not currently intend to do so for the foreseeable future. We currently anticipate that we will retain future earnings for the development, operation and expansion of our business. In addition, our term loan with Oxford currently prohibits us from paying dividends on our equity securities, and any future debt financing arrangement may contain terms prohibiting or limiting the amount of dividends that may be declared or paid on our common stock. Any return to stockholders will therefore be limited to the appreciation of their stock. Therefore, the success of an investment in shares of our common stock will depend upon any future appreciation in their value. There is no guarantee that

shares of our common stock will appreciate in value or even maintain the price at which our stockholders have purchased their shares.

We will incur significant increased costs as a result of operating as a public company, and our management will be required to devote substantial time to new compliance initiatives.

As a public company, we will incur significant legal, accounting and other expenses that we did not incur as a private company. We will be subject to the reporting requirements of the Securities Exchange Act of 1934, as amended, or the Exchange Act, which will require, among other things, that we file with the Securities and Exchange Commission, or the SEC, annual, quarterly and current reports with respect to our business and financial condition. In addition, the Sarbanes-Oxley Act, as well as rules subsequently adopted by the SEC, and The NASDAQ Global Market to implement provisions of the Sarbanes-Oxley Act, imposes significant requirements on public companies, including requiring establishment and maintenance of effective disclosure and financial controls and changes in corporate governance practices. Further, pursuant to the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010, the SEC has adopted additional rules and regulations in these areas, such as mandatory “say on pay” voting requirements that will apply to us when we cease to be an emerging growth company. Stockholder activism, the current political environment and the current high level of government intervention and regulatory reform may lead to substantial new regulations and disclosure obligations, which may lead to additional compliance costs and may impact the manner in which we operate our business in ways we cannot currently anticipate.

We expect the rules and regulations applicable to public companies to substantially increase our legal and financial compliance costs and to make some activities more time-consuming and costly. If these requirements divert the attention of our management and personnel from other business concerns, they could have a material adverse effect on our business, financial condition and results of operations. The increased costs will decrease our net income or increase our net loss, and may require us to reduce costs in other areas of our business or increase the prices of our products or services. For example, we expect these rules and regulations to make it more difficult and more expensive for us to obtain director and officer liability insurance, and we may be required to incur substantial costs to maintain the same or similar coverage. We cannot predict or estimate the amount or timing of additional costs we may incur to respond to these requirements. The impact of these requirements could also make it more difficult for us to attract and retain qualified persons to serve on our board of directors, our board committees or as executive officers.

We are an emerging growth company, and the reduced reporting requirements applicable to emerging growth companies may make our common stock less attractive to investors.

We are an emerging growth company, as defined in the Jumpstart Our Business Startups Act of 2012, or the JOBS Act and are eligible to take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies, including, but not limited to, only two years of audited financial statements in addition to any required unaudited interim financial statements with correspondingly reduced “Management’s Discussion and Analysis of Financial Condition and Results of Operations” disclosure, not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002, or the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in this prospectus and our periodic reports and proxy statements, exemptions from the requirements of holding non-binding advisory votes on executive compensation and seeking stockholder approval of any golden parachute payments not previously approved and not being required to adopt certain accounting standards until those standards would otherwise apply to private companies. We could be an emerging growth company until the last day of the fiscal year following the fifth anniversary of this offering, although circumstances could cause us to lose that status earlier, including if we become a large accelerated filer (in which case we will cease to be an emerging company as of the date we become a large accelerated filer, which, generally, would occur if, at the end of a fiscal year, among other things, the market value of our common stock that is held by non-affiliates exceeds $700 million as of the last business day of our most recently

completed second fiscal quarter), if we have total annual gross revenue of $1.0 billion or more during any fiscal year (in which cases we would no longer be an emerging growth company as of December 31 of such fiscal year), or if we issue more than $1.0 billion in non-convertible debt during any three year period before that time (in which case we would cease to be an emerging growth company immediately). Even after we no longer qualify as an emerging growth company, we may still qualify as a “smaller reporting company,” which would allow us to take advantage of many of the same exemptions from disclosure requirements including not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act and reduced disclosure obligations regarding executive compensation in this prospectus and our periodic reports and proxy statements. We cannot predict if investors will find our common stock less attractive because we may rely on these exemptions. If some investors find our common stock less attractive as a result, there may be a less active trading market for our common stock and our stock price may be more volatile.

If we fail to maintain proper and effective internal control over financial reporting in the future, our ability to produce accurate and timely financial statements could be impaired, which could harm our operating results, investors’ views of us and, as a result, the value of our common stock.

Pursuant to Section 404 of the Sarbanes-Oxley Act, our management will be required to report upon the effectiveness of our internal control over financial reporting beginning with the annual report for our fiscal year ending December 31, 2015. When and if we are a “large accelerated filer” or an “accelerated filer” and are no longer an “emerging growth company,” each as defined in the Exchange Act, our independent registered public accounting firm will be required to attest to the effectiveness of our internal control over financial reporting. However, for so long as we remain an emerging growth company, we intend to take advantage of an exemption available to emerging growth companies from these auditor attestation requirements. The rules governing the standards that must be met for management to assess our internal control over financial reporting are complex and require significant documentation, testing, and possible remediation. To comply with the requirements of being a reporting company under the Exchange Act, we will need to upgrade our systems including information technology; implement additional financial and management controls, reporting systems, and procedures; and hire additional accounting and finance staff. If we or, if required, our auditors are unable to conclude that our internal control over financial reporting is effective, investors may lose confidence in our financial reporting, and the trading price of our common stock may decline.

Because a small number of our existing stockholders own a majority of our voting stock, your ability to influence corporate matters will be limited.

Following the completion of this offering, our executive officers, directors and greater than 5% stockholders, in the aggregate, will own approximately % of our outstanding common stock. As a result, such persons, acting together, will have the ability to control our management and affairs and substantially all matters submitted to our stockholders for approval, including the election and removal of directors and approval of any significant transaction. These persons will also have the ability to control our management and business affairs. This concentration of ownership may have the effect of delaying, deferring or preventing a change in control, impeding a merger, consolidation, takeover or other business combination involving us, or discouraging a potential acquirer from making a tender offer or otherwise attempting to obtain control of our business, even if such a transaction would benefit other stockholders. In addition, all of our existing principal investors have indicated an interest in purchasing an aggregate of approximately $ million to $ million of shares of our common stock in this offering at the initial public offering price. The above ownership percentage following the completion of this offering does not reflect the potential purchase of any shares in this offering by such entities.

NASDAQ may delist our securities from its exchange, which could limit investors’ ability to make transactions in our securities and subject us to additional trading restrictions.

Our common stock has been approved for listing on the NASDAQ Global Market. In order to make a final determination of compliance with their listing criteria, NASDAQ may look to the first trading day’s activity and,

particularly, the last bid price on such day. In the event the trading price for our common stock drops below the NASDAQ Global Market’s $4.00 minimum bid requirement, NASDAQ could rescind our initial listing approval. If that were to happen, the liquidity for our common stock would decrease. If we failed to list the stock on the NASDAQ Global Market, the liquidity for our common stock would be significantly impaired, which may substantially decrease the trading price of our common stock.

In addition, we cannot assure you that, in the future, our securities will meet the continued listing requirements to be listed on NASDAQ. If NASDAQ delists our common stock from trading on its exchange, we could face significant material adverse consequences, including:

•

a limited availability of market quotations for our securities;

•

a determination that our common stock is a “penny stock” which will require brokers trading in our common stock to adhere to more stringent rules and possibly resulting in a reduced level of trading activity in the secondary trading market for our common stock;

•

a limited amount of news and analyst coverage for our company; and

•

a decreased ability to issue additional securities or obtain additional financing in the future.

Anti-takeover provisions in our charter documents and under Delaware law could make an acquisition of us, which may be beneficial to our stockholders, more difficult and may prevent attempts by our stockholders to replace or remove our current management.

Provisions in our amended and restated certificate of incorporation and amended and restated bylaws that will be in effect upon completion of this offering may delay or prevent an acquisition of us or a change in our management. These provisions include:

•

authorizing the issuance of “blank check” preferred stock, the terms of which may be established and shares of which may be issued without stockholder approval;

•

limiting the removal of directors by the stockholders;

•

creating a staggered board of directors;

•

prohibiting stockholder action by written consent, thereby requiring all stockholder actions to be taken at a meeting of our stockholders;

•

eliminating the ability of stockholders to call a special meeting of stockholders;

•

permitting our board of directors to accelerate the vesting of outstanding option grants upon certain transactions that result in a change of control; and

•

establishing advance notice requirements for nominations for election to the board of directors or for proposing matters that can be acted upon at stockholder meetings.

In addition, because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporation Law, which limits the ability of stockholders owning in excess of 15% of our outstanding voting stock to merge or combine with us. Although we believe these provisions collectively provide for an opportunity to obtain greater value for stockholders by requiring potential acquirors to negotiate with our board of directors, they would apply even if an offer rejected by our board were considered beneficial by some stockholders. In addition, these provisions may frustrate or prevent any attempts by our stockholders to replace or remove our current management by making it more difficult for stockholders to replace members of our board of directors, which is responsible for appointing the members of our management.

INFORMATION REGARDING FORWARD-LOOKING STATEMENTS

This prospectus includes forward-looking statements. All statements other than statements of historical facts contained in this prospectus, including statements regarding our future results of operations and financial position, strategy and plans, and our expectations for future operations, are forward-looking statements. The words “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “design,” “intend,” “expect,” “could,” “plan,” “potential,” “predict,” “seek,” “should,” “would” or the negative version of these words and similar expressions are intended to identify forward-looking statements. We have based these forward-looking statements on our current expectations and projections about future events and trends that we believe may affect our financial condition, results of operations, strategy, short- and long-term business operations and objectives, and financial needs. These forward-looking statements are subject to a number of risks, uncertainties, assumptions and other important factors, including those described in “Risk Factors.” In light of these risks, uncertainties, assumptions and other factors, the forward-looking events and circumstances discussed in this prospectus may not occur, and actual results could differ materially and adversely from those anticipated or implied in the forward-looking statements. Given these uncertainties, you should not place undue reliance on these forward-looking statements.

Forward-looking statements include, but are not limited to, statements about:

•

the timing and success of preclinical studies and clinical trials conducted by us and our development partners;

•

the ability to obtain and maintain regulatory approval of our product candidates, and the labeling for any approved products;

•

the scope, progress, expansion, and costs of developing and commercializing CVC or other future product candidates;

•

the size and growth of the potential markets for CVC or other future product candidates and the ability to serve those markets;

•

our expectations regarding our expenses and revenue, the sufficiency of our cash resources and needs for additional financing;

•

the rate and degree of market acceptance of any of CVC or other future product candidates;

•

our expectations regarding competition;

•

our anticipated growth strategies;

•

our ability to attract or retain key personnel;

•

our ability to establish and maintain development partnerships;

•

our expectations regarding federal, state and foreign regulatory requirements;

•

regulatory developments in the United States and foreign countries;

•

our ability to obtain and maintain intellectual property protection for our product candidates;

•

the anticipated trends and challenges in our business and the market in which we operate; and

•

our use of proceeds from this offering.

Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee future results, level of activity, performance or achievements. In addition, neither we nor any other person assumes responsibility for the accuracy and completeness of any of these forward-looking statements. Any forward-looking statement made by us in this prospectus speaks only as of the date on which it is made. Except as required by law, we disclaim any duty to update any of these forward-looking statements after the date of this prospectus publicly, or to update the reasons actual results could differ materially from those anticipated in these forward-looking statements, even if new information becomes available in the future.

You should rely only on the information contained in this prospectus and any free writing prospectus prepared by us or on our behalf or to which we have referred you. You should read this prospectus and any such free writing prospectus and the documents that we reference in this prospectus and have filed with the Securities and Exchange Commission as exhibits to the registration statement of which this prospectus is a part completely and with the understanding that our actual future results may be materially different from what we expect. We qualify all of our forward-looking statements by these cautionary statements.

INDUSTRY AND MARKET DATA

We obtained the industry, market and competitive position data used throughout this registration statement from our own internal estimates and research, as well as from industry and general publications, in addition to research, surveys and studies conducted by third parties. Internal estimates are derived from publicly available information released by industry analysts and third-party sources, our internal research and our industry experience, and are based on assumptions made by us based on such data and our knowledge of our industry and market, which we believe to be reasonable. In addition, while we believe the industry, market and competitive position data included in this prospectus is reliable and is based on reasonable assumptions, such data involves risks and uncertainties and are subject to change based on various factors, including those discussed in “Risk Factors.” These and other factors could cause results to differ materially from those expressed in the estimates made by the independent parties and by us.

USE OF PROCEEDS

We estimate that the net proceeds from the sale of shares of our common stock in this offering will be approximately $ million, based on an assumed initial public offering price of $ per share, the midpoint of the price range set forth on the cover page of this prospectus, and after deducting the estimated underwriting discounts and commissions and estimated offering expenses payable by us. If the underwriters’ option to purchase additional shares from us is exercised in full, we estimate that our net proceeds will be approximately $ million. A $1.00 increase (decrease) in the assumed initial public offering price of $ per share, the midpoint of the price range set forth on the cover page of this prospectus, would increase (decrease) the estimated net proceeds to us by approximately $ million, assuming that the number of shares offered by us as set forth on the cover page of this prospectus remains the same and after deducting the estimated underwriting discounts and commissions and estimated offering expenses payable by us. We may also increase or decrease the number of shares we are offering. An increase (decrease) of 1.0 million in the number of shares offered by us would increase (decrease) the net proceeds to us by approximately $ million, assuming an initial public offering price of $ per share, the midpoint of the price range set forth on the cover page of this prospectus, and after deducting the estimated underwriting discounts and commissions and estimated offering expenses payable by us.

We are undertaking this offering in order to access the public capital markets and increase our liquidity. We intend to use the net proceeds from this offering to fund the further development and commercialization of CVC for the treatment of NASH, including our Phase 2b CENTAUR trial currently enrolling patients, and other immuno-inflammatory and fibrosis indications, as well as for manufacturing of clinical drug supply, working capital and general corporate purposes. We estimate that the proceeds from this offering, together with our current resources, can fund operations through the primary endpoint of the CENTAUR study. Although we cannot specify with certainty the particular amounts or uses for the net proceeds from this offering, we currently intend to use approximately:

•

$ million for the development of CVC for the treatment of NASH including our Phase 2b clinical trial of CVC for the treatment of NASH,

•

$ million for other immuno-inflammatory and fibrosis indications,

•

$ million for manufacturing of clinical drug supply, and

•

the remainder for working capital and general corporate purposes.

Accordingly, our management will have broad discretion in using the net proceeds from this offering. We will require substantial future capital in order to complete the remaining clinical development for CVC and our other product candidates and to potentially commercialize these products. We do not intend to use the net proceeds from this offering for our Phase 3 program for HIV-1 because we intend to advance this program only through a strategic collaboration or non-dilutive financing.

Pending the use of proceeds from this offering as described above, we plan to invest the net proceeds in short- and intermediate-term, interest-bearing obligations, investment-grade instruments, certificates of deposit or direct or guaranteed obligations of the U.S. government.

DIVIDEND POLICY

We have never declared or paid any cash dividend on our capital stock. We currently intend to retain all available funds and any future earnings to support our operations and finance the growth and development of our business. We do not expect to pay any dividends in the foreseeable future. In addition, unless amended, the terms of our term loan with Oxford do not allow us to pay cash dividends. Any determination to pay dividends in the future will be at the discretion of our board of directors and will depend on, among other factors, our financial condition, operating results, capital requirements, general business conditions, contractual restrictions and other factors that our board of directors may deem relevant.

CAPITALIZATION

The following table sets forth our cash and cash equivalents and our capitalization as of September 30, 2014, as follows:

The preceding table presents a summary of our balance sheet data as of September 30, 2014:

•

on an actual basis;

•

on a pro forma basis to give effect to (i) the Transactions immediately prior to the completion of this offering and (ii) the conversion of our outstanding convertible preferred stock warrants issued in connection with our term loans with Square 1 Bank and Oxford into warrants to purchase 44,482 shares of common stock.

•

on a pro forma as adjusted basis to give further effect to the issuance and sale of shares of our common stock by us and the receipt of the estimated net proceeds from such sale, assuming an initial public offering price of $ per share, the midpoint of the price range set forth on the cover page of this prospectus, and after deducting the estimated underwriting discounts and commissions and estimated expenses payable by us.

You should read this table in conjunction with “Selected Financial Data” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our financial statements and related notes included elsewhere in this prospectus.


	As of September 30, 2014
	Actual			Pro Forma			Pro Forma as adjusted
	(unaudited)			(unaudited)			(unaudited)
(In thousands, except share and per share data)
Cash and cash equivalents	$	11,808		$	11,808		$


Capitalization:
Term loan	$	14,714		$	14,714
Convertible notes, related party		29,576			—
Preferred stock warrant liabilities		2,233			—
Series A noncumulative convertible preferred stock, par value $0.0001: 27,542,369 shares authorized, 994,866 issued and outstanding, actual; no shares authorized, issued, or outstanding, pro forma and pro forma as adjusted		30,908			—
Series B noncumulative convertible preferred stock, par value $0.0001: 135,557,631 shares authorized, 2,151,722 issued and outstanding, actual; no shares authorized, issued, or outstanding, pro forma and pro forma as adjusted		31,074			—

Stockholders’ deficit:
Common stock, par value $0.0001: 223,317,000 shares authorized, 282,157 shares issued and outstanding, actual; 150,000,000 shares authorized, 7,066,148 shares issued and outstanding, pro forma; shares authorized and shares issued and outstanding, pro forma as adjusted		—			1
Additional paid-in capital		3,897			101,286
Deficit accumulated during the development stage		(103,346	)		(103,444	)

Total stockholders’ deficit		(99,449	)		(2,157	)

Total capitalization	$	9,056		$	12,557		$

The pro forma as adjusted information below is illustrative only and our cash and cash equivalents and capitalization following the closing of this offering will be adjusted based on the actual initial public offering price and other terms of this offering determined at pricing. A $1.00 increase (decrease) in the assumed initial public offering price of $ per share, the midpoint of the price range set forth on the cover page of this prospectus, would increase (decrease) each of cash and cash equivalents, additional paid-in capital, total stockholders’ deficit and total capitalization by $ million, assuming that the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same, and after deducting the estimated underwriting discounts and commissions and estimated offering expenses payable by us. Each increase (decrease) of 1.0 million in the number of shares offered by us would increase (decrease) cash and cash equivalents, additional paid-in capital, total stockholders’ deficit and total capitalization by approximately $ million, assuming an initial public offering price of $ per share, the midpoint of the price range set forth on the cover page of this prospectus, and after deducting the estimated underwriting discounts and commissions and estimated offering expenses payable by us. The pro forma as adjusted information discussed above is illustrative only and will be adjusted based on the actual public offering price and other terms of this offering determined at pricing.

The table above excludes the following shares:

•

925,940 shares of common stock issuable upon the exercise of options outstanding as of September 30, 2014, with a weighted-average exercise price of $6.22 per share;

•

1,736,601 shares of common stock reserved for future grant or issuance under our stock-based compensation plans, consisting of:

•

236,601 shares of common stock reserved for future grants under our 2010 Stock Plan and 2007 Stock Plan;

•

44,482 shares of common stock issuable upon the exercise of warrants issued to our term loan lenders at an exercise price of $14.50 per share.

DILUTION

If you invest in our common stock in this offering, you will experience dilution to the extent of the difference between the initial public offering price per share of our common stock and the pro forma as adjusted net tangible book value per share of our common stock immediately after this offering.

Historical net tangible book value per share is determined by subtracting our total liabilities from our total tangible assets, and dividing the result by the number of shares of common stock outstanding. Our historical net tangible book deficit as of September 30, 2014, was $99.4 million, or $(352.46) per share of common stock. On a pro forma basis, after giving effect to (i) the Transactions immediately prior to the completion of this offering, assuming an initial public offering price of $ per share, the mid point of the price range set forth on the cover page of this prospectus, our pro forma net tangible book deficit as of September 30, 2014, would have been $ million, or $ per share.

After giving further effect to the issuance and sale of shares of our common stock by us and the receipt of the estimated net proceeds from such sale, assuming an initial public offering price of $ per share, the midpoint of the price range set forth on the cover page of this prospectus, and after deducting the estimated underwriting discounts and commissions and estimated expenses payable by us, our pro forma as adjusted net tangible book value as of September 30, 2014 would have been $ million, or $ per share. This represents an immediate increase in pro forma net tangible book value of $ per share to existing stockholders and an immediate dilution of $ per share to purchasers of common stock in this offering, as illustrated in the following table:


Assumed initial public offering price per share			$
Historical net tangible book deficit per share as of September 30, 2014	$	352.46
Pro forma increase in net tangible book value per share as of September 30, 2014 attributable to the pro forma transactions described in the second paragraph above

Pro forma net tangible book value per share as of September 30, 2014
Increase in pro forma net tangible book value per share attributable to new investors in this offering

Pro forma as adjusted net tangible book value per share immediately after this offering

Dilution per share to new investors in this offering			$

If the underwriters’ over-allotment option to purchase additional shares is exercised in full, the pro forma as adjusted net tangible book value per share after this offering would be $ per share, the increase in pro forma as adjusted net tangible book value per share to existing stockholders would be $ per share and the dilution to new investors purchasing shares in this offering would be $ per share.

The following table presents, on a pro forma as adjusted basis as of September 30, 2014, the differences between existing stockholders and purchasers of shares in this offering with respect to the number of shares purchased from us, the total consideration paid or to be paid and the average price paid per share, assuming, with respect to the purchasers of shares in this offering (assuming no participation by our existing principal investors), an initial public offering price of $ per share, the midpoint of the price range on the cover of this prospectus and before deducting estimated underwriting discounts and commissions and estimated expenses payable by us:


	Shares Purchased				Total Consideration				Average Price per Share
	Number	Percent			Amount	Percent			Average Price per Share
Existing stockholders before this offering				%	$			%	$
Investors participating in this offering

Total			100	%	$		100	%

The table above is based on 7,066,148 shares outstanding as of September 30, 2014 after giving effect to the pro forma adjustments described above and excludes:

•

925,940 shares of common stock issuable upon the exercise of options outstanding as of September 30, 2014, with a weighted-average exercise price of $6.22 per share;

•

1,736,601 shares of common stock reserved for future grant or issuance under our stock-based compensation plans, consisting of:

•

236,601 shares of common stock reserved for future grants under our 2010 Stock Plan and 2007 Stock Plan;

•

44,482 shares of common stock issuable upon the exercise of warrants issued to our term loan lenders at an exercise price of $14.50 per share.

To the extent that any outstanding options or warrants are exercised or new options are issued under our incentive plans, there will be further dilution to investors participating in this offering.

SELECTED FINANCIAL DATA

We are a development stage company. The following tables set forth selected financial data. The selected financial data included in this section are not intended to replace the financial statements and the related notes included elsewhere in this prospectus. The selected statement of operations data for the years ended December 31, 2012 and 2013 and the selected balance sheet data as of December 31, 2012 and 2013 were derived from our audited financial statements appearing elsewhere in this prospectus. The selected statement of operations data for the nine months ended September 30, 2013 and 2014 and the period from September 11, 2006 (inception) to September 30, 2014 and the selected balance sheet data as of September 30, 2014 were derived from our unaudited financial statements appearing elsewhere in this prospectus. The unaudited financial statements have been prepared on a basis consistent with our audited financial statements included in this prospectus and include, in our opinion, all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of the financial information in those statements. You should read this selected financial data in conjunction with the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our financial statements and related notes included elsewhere in this prospectus. Our historical results are not necessarily indicative of our results for any future period and results of interim periods are not necessarily indicative of the results for the entire year.


	Years Ended December 31,						Nine Months Ended September 30,						Period from September 11, 2006 (Inception) Through September 30, 2014
(In thousands, except share and per share data)	2012			2013			2013			2014
							(unaudited)						(unaudited)
Statement of Operations and Comprehensive Loss Data:
Operating expenses
Research and development	$	13,757		$	12,413		$	10,497		$	8,274		$	73,979
General and administrative		3,250			2,764			2,151			2,754			22,483

Total operating expenses		17,007			15,177			12,648			11,028			96,462

Operating loss		(17,007	)		(15,177	)		(12,648	)		(11,028	)		(96,462	)
Other income (expense), net		(1,842	)		(3,412	)		(2,734	)		(2,387	)		(7,610	)

Loss before income tax benefit (expense)		(18,849	)		(18,589	)		(15,382	)		(13,415	)		(104,072	)
Income tax benefit (expense)		—			—			—			(271	)		726

Net loss and comprehensive loss	$	(18,849	)	$	(18,589	)	$	(15,382	)	$	(13,686	)	$	(103,346	)

Net loss per share, basic and diluted	$	(71.13	)	$	(67.66	)	$	(55.79	)	$	(48.50	)

Weighted-average common shares outstanding, basic and diluted		264,987			274,735			275,728			282,157

Pro-forma net loss per share, basic and diluted (unaudited)				$	(2.61	)				$	(1.68	)

Pro-forma weighted-average common shares outstanding, basic and diluted, (unaudited)⁽¹⁾					5,807,650						6,874,161

(1)


	As of December 31,						As of September 30, 2014
	2012			2013			As of September 30, 2014
(In thousands)							(unaudited)
Balance Sheet Data:
Cash and cash equivalents	$	10,940		$	4,088		$	11,808
Working capital deficit		(4,652	)		(21,309	)		(24,934	)
Total assets		11,547			4,278			17,191
Convertible notes, related party		8,205			20,553			29,576
Term loan		3,804			1,820			14,714
Preferred stock warrant liabilities		2,475			2,773			2,233
Convertible preferred stock		61,982			61,982			61,982
Deficit accumulated during development stage		(71,071	)		(89,660	)		(103,346	)
Total stockholders’ deficit		(69,017	)		(85,995	)		(99,449	)

MANAGEMENT’S DISCUSSION AND ANALYSIS

OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis should be read in conjunction with “Selected Financial Data” and our financial statements and related notes included elsewhere in this prospectus. This discussion and analysis and other parts of this prospectus contain forward-looking statements based upon current beliefs, plans and expectations that involve risks, uncertainties and assumptions, such as statements regarding our plans, objectives, expectations, intentions and projections. Our actual results and the timing of selected events could differ materially from those anticipated in these forward-looking statements as a result of several factors, including those set forth under “Risk Factors” and elsewhere in this prospectus. You should carefully read the “Risk Factors” section of this prospectus to gain an understanding of the important factors that could cause actual results to differ materially from our forward-looking statements. Please also see the section entitled “Special Note Regarding Forward-Looking Statements.”

Overview

We are a clinical-stage biopharmaceutical company focused on the development and commercialization of innovative therapeutics to treat liver disease, human immunodeficiency virus, or HIV, fibrosis and inflammation. Our lead product candidate, cenicriviroc, or CVC, is a proprietary immunomodulator that can potentially be used to treat a number of disease states with high unmet medical need. We are developing CVC for nonalcoholic steatohepatitis, or NASH, for which we are enrolling a Phase 2b clinical trial. CVC is a once-daily pill with well-established safety and tolerability in approximately 580 subjects dosed in completed Phase 1 and Phase 2 trials, including a pharmacokinetics (PK) and safety study in subjects with liver cirrhosis and 115 HIV type 1, or HIV-1, infected subjects on treatment for up to 48 weeks. We also plan to advance CVC in a fixed-dose combination for HIV-1 infection through Phase 3 development and commercialization in collaboration with a strategic partner or with non-dilutive financing.

We have no products approved for commercial sale and have not generated any revenues from product sales since our inception in 2006. From inception to September 30, 2014, we have raised net cash proceeds of approximately $91.9 million to fund operations, primarily from private placements of convertible preferred stock, convertible notes and warrants. In addition, we have borrowed $19.0 million under term loans with Square 1 Bank and Oxford Finance LLC, or Oxford, of which $4.0 million has been repaid to Square 1 Bank to fully pay off that loan and we plan to use the balance for working capital.

We have never been profitable and have incurred significant operating losses in each year since our inception. Our net losses for the years ended December 31, 2012 and 2013 and for the nine months ended September 30, 2013 and 2014 were $18.8 million, $18.6 million, $15.4 million and $13.7 million, respectively. As of September 30, 2014, we had a deficit accumulated during the development stage of $103.3 million. Substantially all of our operating losses resulted from expenses incurred in connection with our research and development programs and from general and administrative costs associated with our operations. We expect to continue to incur significant expenses and increasing operating losses for at least the next several years as we continue the clinical development of, and seek regulatory approval for our drug candidates. Our operating losses may fluctuate significantly from quarter to quarter and year to year.

To fund future operations, we will need to raise additional capital. The expected net proceeds from this offering, together with our existing cash and cash equivalents will not be sufficient for us to complete development of our product candidates or, if applicable, to prepare for commercializing any product candidate which may receive approval. In addition, we plan to initiate a Phase 3 HIV clinical program if we are able to enter into a strategic collaboration or secure non-dilutive financing. Accordingly, we will continue to require substantial additional capital beyond the expected proceeds from this offering to continue our clinical development and potential commercialization activities. The amount and timing of our future funding requirements will depend on many factors, including the pace and results of our clinical development efforts. As of September 30, 2014, we had cash and cash equivalents of $11.8 million. We may seek to obtain additional

financing in the future through the issuance of our common stock, through other equity or debt financings, through collaborations or partnerships with other companies or through non-dilutive financing. We may not be able to raise additional capital on terms acceptable to us, or at all, and any failure to raise capital as and when needed will likely have a negative impact on our financial condition and our ability to execute on our business plan. We believe that the net proceeds from this offering and our existing cash and cash equivalents will be sufficient to fund our operations through at least the second quarter of 2016.

Basis of Presentation

Research and Development Expenses

Research and development expenses primarily consist of costs associated with our research activities, including the preclinical and clinical development of our product candidates. We expense research and development expenses as incurred. We contract with clinical research organizations to manage our clinical trials under agreed upon budgets for each study, with oversight by our clinical program managers. We account for nonrefundable advance payments for goods and services that will be used in future research and development activities as expenses when the service has been performed or when the goods have been received. Manufacturing expense includes costs associated with drug formulation development and clinical drug production. We do not track our employee and facility related research and development costs by project, as we typically use our employee and infrastructure resources across multiple research and development programs. We believe that the allocation of such costs would be arbitrary and would not be meaningful. Our research and development costs are controlled through our internal budget and forecast process.

Our research and development expenses consist primarily of:

•

salaries and related expenses for employee personnel, including benefits, travel and expenses related to stock-based compensation granted to personnel in development functions;

•

external expenses paid to clinical trial sites, contract research organizations, laboratories, database software and consultants that conduct our clinical trials;

•

expenses related to drug formulation development and the production of nonclinical and clinical trial supplies, including fees paid to contract manufacturers;

•

expenses related to preclinical studies;

•

expenses related to compliance with drug development regulatory requirements; and

•

other allocated expenses, which include direct and allocated expenses for rent and maintenance of facilities, depreciation of equipment, and other supplies.

We expect to continue to incur substantial expenses related to our development activities for the foreseeable future as we conduct our Phase 2b clinical trial of CVC in NASH for a study entitled “Cenicriviroc Efficacy and Safety Study in Adult Subjects with Nonalcoholic Steatohepatitis and Liver Fibrosis”, which we refer to as CENTAUR. Product candidates in later stages of clinical development generally have higher development costs than those in earlier stages of clinical development, primarily due to the increased size and duration of later-stage clinical trials. Although our research and development expenses decreased in 2013 and in the nine months ended September 30, 2014 due to the completion of our Phase 2b HIV study, we expect that our research and development expenses will increase substantially in the future. The process of conducting preclinical studies and clinical trials necessary to obtain regulatory approval is costly and time consuming. The probability of success for each product candidate is affected by numerous factors, including preclinical data, clinical data, competition, manufacturing capability and commercial viability. Accordingly, we may never succeed in achieving marketing approval for any of our product candidates.

Successful development of current and future product candidates is highly uncertain. Completion dates and costs for our clinical development programs as well as our research program can vary significantly for each current and future product candidate and are difficult to predict. As a result, we cannot estimate with any degree

of certainty the costs we will incur in connection with development of our product candidates. We anticipate we will make determinations as to which programs and product candidates to pursue and how much funding to direct to each program and product candidate on an ongoing basis in response to the scientific success of early research programs, results of ongoing and future clinical trials, our ability to enter into collaborative agreements with respect to programs or potential product candidates, as well as ongoing assessments as to each current or future product candidate’s commercial potential.

Research and development expenses by major programs or categories were as follows (in thousands):


	Year Ended December 31,				Nine Months Ended September 30,
	2012		2013		2013		2014
Phase 2b CENTAUR study	$	—	$	—	$	—	$	1,920
Phase 2b HIV clinical study⁽¹⁾		5,484		2,710		2,612		89
Other clinical studies⁽²⁾		1,311		2,374		3,090		1,512
Preclinical studies		639		1,472		1,273		440
Contract manufacturing		2,712		2,329		1,681		1,710
Internal and unallocated research and development expense		3,611		3,528		1,841		2,603

	$	13,757	$	12,413	$	10,497	$	8,274

(1)

In addition, Phase 2b HIV clinical study expenses for 2010 and 2011 totaled $7.6 million.

(2)

Other clinical studies primarily reflect expenditures for drug interaction and bioavailability studies and a Phase 1 hepatic impairment study conducted in 2014.

General and Administrative Expenses

General and administrative expenses consist primarily of salaries, benefits and stock-based compensation expense for employees in executive, finance, business development and support functions. Other significant general and administrative expenses include the costs associated with obtaining and maintaining our patent portfolio, professional fees for accounting, auditing, consulting and legal services, travel and allocated overhead expenses.

We expect that our general and administrative expenses will increase in the future as we expand our operating activities, increase headcount and maintain and expand our patent portfolio, as well as incur additional costs associated with being a publicly traded company and maintaining compliance with exchange listing and Securities and Exchange Commission requirements. These increases will likely include legal fees, accounting fees, directors’ and officers’ liability insurance premiums and fees associated with investor relations.

Other Income (Expense), Net

Other income (expense), net consists primarily of cash interest expense on our term loans with Square 1 Bank and Oxford and non-cash interest expense and amortization of debt issuance and debt discount costs related to our convertible notes. Concurrently with the issuance of the convertible notes and associated warrants, we recorded a beneficial conversion feature equal to the difference between the conversion price and the fair value of the underlying preferred stock into which the convertible notes may be converted. The intrinsic value of this beneficial conversion feature is recorded as a debt discount and is amortized over the debt borrowing term.

In connection with the sale of our Series B convertible preferred stock, we provided stockholders with the right to obligate us to sell additional shares in a second closing contingent upon certain events. This tranche right was recorded on the date of issuance at its estimated fair value and was remeasured at each reporting period with increases or reductions in fair value recorded in other income (expenses), net. Upon completion of the second closing of the Series B preferred stock financing in 2011, the tranche preferred stock liability was reclassified to Series B preferred stock.

Income Taxes

We have incurred net losses and have not recorded any U.S. federal or state income tax benefits for the losses as they have been offset by valuation allowances.

We expect the future utilization of net operating loss and tax credit carryforwards to be limited due to changes in ownership. In general, if we experience a greater than 50% aggregate change in ownership of certain significant stockholders or groups over a three-year period, or a Section 382 ownership change, utilization of our pre-change net operating loss carryforwards would be subject to an annual limitation under Section 382 of the Internal Revenue Code of 1986, as amended, and similar state laws. The annual limitation generally is determined by multiplying the value of our stock at the time of such ownership change (subject to certain adjustments) by the applicable long-term tax-exempt rate. Such limitations may result in expiration of a portion of our operating loss carryforwards before we can use them and may be substantial. We have recorded a valuation allowance on all of our deferred tax assets, including our deferred tax assets related to our net operating loss and research and development tax credit carryforwards.

Critical Accounting Policies and Significant Judgments and Estimates

Our management’s discussion and analysis of our financial condition and results of operations are based on our financial statements, which have been prepared in accordance with U.S. generally accepted accounting principles, or GAAP. The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, and expenses and the disclosure of contingent assets and liabilities at the date of the financial statements. On an ongoing basis, we evaluate our estimates and judgments, including those related to accrued research and development expenses, warrant liabilities and stock-based compensation expense. We base our estimates on historical experience, known trends and events, and various other factors that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ materially from these estimates under different assumptions or conditions.

While our significant accounting policies are described in more detail in the notes to our financial statements appearing elsewhere in this prospectus, we believe the following accounting policies are the most critical for fully understanding and evaluating our financial condition and results of operations.

Accrued Research and Development Expenses

We make estimates of our accrued research and development expenses as of each balance sheet date in our financial statements based on the facts and circumstances known to us at that time. Our expense accruals for clinical trial activities performed by third parties are based upon estimates of the proportion of work completed over the life of the individual clinical trial and patient enrollment rates in accordance with agreements established with CROs and clinical trial sites. We determine the estimates by reviewing contracts, vendor agreements and purchase orders, and through discussions with internal clinical personnel and external service providers as to the progress or stage of completion of trials or services and the agreed-upon fee to be paid for such services. If possible, we obtain information regarding unbilled services directly from these service providers. However, we may be required to estimate these services based on other information available to us.

If the actual timing of the performance of services or the level of effort varies from the estimate, we will adjust the accrual accordingly. If we underestimate or overestimate the activity or fees associated with a study or service at a given point in time, adjustments to research and development expenses may be necessary in future periods. Historically, our estimated accrued liabilities have approximated actual expense incurred. Subsequent changes in estimates may result in a material change in our accruals. Nonrefundable advance payments for goods and services, including fees for process development or manufacturing and distribution of clinical supplies that will be used in future research and development activities, are deferred and recognized as expense in the period that the related goods are consumed or services are performed.

Estimated Fair Value of Preferred Stock Warrants

We have issued freestanding warrants to purchase shares of our convertible preferred stock. The fair value of these warrants is recorded as a liability on our balance sheet at issuance and remeasured at each reporting period. The warrants are recorded at fair value using an option pricing model. At the end of each reporting period, changes in estimated fair value during the period are recorded as a component of other income (expense), net. We will continue to re-measure the fair value of these liabilities until the earlier of the expiration of the warrants, exercise of the warrants, or conversion of the preferred stock underlying the warrants into common stock upon the completion of a liquidity event, including an initial public offering, at which time the liabilities will be reclassified to additional paid-in capital. All outstanding preferred stock warrants issued in connection with our convertible debt financings will become exercisable prior to the consummation of this offering.

Stock-based Compensation Expense

Stock-based compensation expense is measured at the date of grant, based on the estimated fair value of the award using the Black-Scholes option pricing model. For awards subject to time-based vesting conditions, we recognize stock-based compensation expense over the employee’s requisite service period on a straight-line basis, net of estimated forfeitures. We account for stock-based compensation arrangements with non-employees using a fair value approach. Stock options granted to non-employees are subject to periodic revaluation over their vesting terms.

The Black-Scholes option pricing model requires the input of highly subjective assumptions, including (a) the risk-free interest rate, (b) the expected volatility of our stock, (c) the expected term of the award and (d) the expected dividend yield. Due to the lack of a public market for the trading of our common stock and a lack of company specific historical and implied volatility data, we have based our estimate of expected volatility on the historical volatility of a group of similar companies whose shares are publicly traded. For these analyses, we have selected biopharmaceutical companies with comparable characteristics to ours including the stage of development of their product candidates, risk profiles, position within the industry, and with historical share price information sufficient to meet the expected life of the stock-based awards. We compute the historical volatility data using the daily closing prices for the selected companies’ shares during the equivalent period of the calculated expected term of our stock-based awards. We have estimated the expected term of our employee stock options using the “simplified” method, whereby the expected life equals the average of the vesting term and the original contractual term of the option. The risk-free interest rates for periods within the expected life of the option are based on the yields of zero-coupon U.S. Treasury securities with maturities similar to those of the expected term of the award being valued. We estimate forfeitures based on an analysis of our historical forfeitures.

See Note 9 to Notes to Financial Statements included elsewhere in this prospectus for information concerning certain specific assumptions used in applying the Black-Scholes option-pricing model to determine the estimated fair value of stock options granted in 2012 and 2013 and for the nine months ended September 30, 2013 and 2014. In addition to the assumptions used in the Black-Scholes option-pricing model, we must also estimate a forfeiture rate to calculate the stock-based compensation expense for our awards. We will continue to use judgment in evaluating the expected volatility, expected terms, and forfeiture rates utilized for our stock-based compensation expense calculations on a prospective basis.

Common Stock Valuations

We are required to estimate the fair value of the common stock underlying our stock-based awards when performing fair value calculations. The fair value of the common stock underlying our stock-based awards was determined on each grant date by our board of directors, with input from management and independent third-party valuation analysis. All options to purchase shares of our common stock are intended to be granted with an exercise price per share no less than the fair value per share of our common stock underlying those options on the date of grant, based on the information known to us on the date of grant. In the absence of a public trading market for our common stock, on each grant date we develop an estimate of the fair value of our common stock in order to determine an exercise price for the option grants. Our determinations of the fair value of our common stock were made using methodologies, approaches and assumptions consistent with the American Institute of Certified Public Accountants Audit and Accounting Practice Aid Series: Valuation of Privately Held Company Equity Securities Issued as Compensation, or the Practice Aid.

In addition, our board of directors also considered various objective and subjective factors, along with input from management, to determine the fair value of our common stock, including:

•

contemporaneous valuations prepared by an independent third-party valuation specialist;

•

the prices of our convertible preferred stock sold to investors in arm’s length transactions and the rights, preferences and privileges of our convertible preferred stock as compared to those of our common stock, including the liquidation preferences of our convertible preferred stock;

•

our results of operations, financial position and the status of research and development efforts and achievement of enterprise milestones;

•

the composition of, and changes to, our management team and board of directors;

•

the lack of liquidity of our common stock as a private company;

•

our stage of development, business strategy and the material risks related to our business and industry;

•

the valuation of publicly-traded companies in the life sciences and biotechnology sectors, as well as recently completed mergers and acquisitions of peer companies;

•

external market conditions affecting the life sciences and biotechnology industry sectors;

•

the likelihood of achieving a liquidity event for the holders of our common stock, such as an initial public offering, or IPO, or a sale of our company, given prevailing market conditions; and

•

the state of the IPO market for similarly situated privately held biotechnology companies.

Our assessment analyses were based on a methodology that first estimated the fair value of our business as a whole, or enterprise value. Once we determined the expected enterprise value, we then adjusted for expected cash and debt balances, allocated value to the various stockholders, adjusted to present value and discounted for lack of marketability taking into account the fact that our stockholders cannot freely trade our common stock in the public markets.

There are significant judgments and estimates inherent in the determination of the fair value of our common stock. These judgments and estimates include the selection of the appropriate valuation model, assumptions regarding our future operating performance and financial forecasts utilized to determine future cash balances and necessary capital requirements, the probability and timing of the various possible liquidity events, the estimated weighted average cost of capital and the discount for lack of marketability of our common stock. If we had made different assumptions, our stock-based compensation expense, net loss and net loss per common share could have been significantly different.

Common Stock Valuation Methodologies

Our valuations were prepared in accordance with applicable elements of the Practice Aid, which prescribes several valuation approaches for setting the value of an enterprise, such as the cost, income and market approaches, and various methodologies for allocating the value of an enterprise to its common stock. The cost approach establishes the value of an enterprise based on the cost of reproducing or replacing the property less depreciation and functional or economic obsolescence, if present. The income approach establishes the value of an enterprise based on the present value of future cash flows that are reasonably reflective of our company’s future operations, discounting to the present value with an appropriate risk-adjusted discount rate or capitalization rate. The market approach is based on the assumption that the value of an asset is equal to the value of a substitute asset with the same characteristics.

Methods Used to Allocate Our Enterprise Value to Classes of Securities

In accordance with the Practice Aid, we considered the various methods for allocating the enterprise value across our classes and series of capital stock to determine the fair value of our common stock at each valuation date.

The methods we considered consisted of the following:

•

Current value method. Under the current value method, once the fair value of the enterprise is established, the value is allocated to the various series of preferred and common stock based on their respective seniority, liquidation preferences or conversion values, whichever is greatest.

•

Option pricing method. Under the option pricing method, shares are valued by creating a series of call options with exercise prices based on the liquidation preferences and conversion terms of each equity class. The values of the preferred and common stock are inferred by analyzing these options.

•

Probability-weighted expected return method, or PWERM. The PWERM is a scenario-based analysis that estimates the value per share based on the probability-weighted present value of expected future investment returns, considering each of the possible outcomes available to us, as well as the economic and control rights of each share class.

In valuing our common stock, our board of directors determined the equity value of our company by utilizing the income and market approaches. The per share common stock value was estimated by allocating the enterprise value using the PWERM at each valuation date during 2012, 2013 and 2014.

The list above is not intended to be a comprehensive list of all of our accounting policies. In many cases, the accounting treatment of a particular transaction is specifically dictated by GAAP. There are also areas in which our management’s judgment in selecting any available alternative may produce a materially different result. Please see our audited financial statements and notes thereto included elsewhere in this prospectus, which contain accounting policies and other disclosures required by GAAP.

Emerging Growth Company Status

We are an “emerging growth company,” as defined in the Jumpstart Our Business Startups Act of 2012, or the JOBS Act, and are eligible to take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not “emerging growth companies,” including, but not limited to, only two years of audited financial statements in addition to any required unaudited interim financial statements with correspondingly reduced “Management’s Discussion and Analysis of Financial Conditions and Results of Operations” disclosure, not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002, or the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in our periodic reports and proxy or information statements, exemptions from the requirements of holding a non-binding advisory vote on executive compensation and seeking stockholder approval of any golden parachute payments not previously approved and not being required to adopt certain accounting standards until those standards would otherwise apply to private companies.

Although we are still evaluating our options under the JOBS Act, we may take advantage of some or all of the reduced regulatory and reporting requirements that will be available to us so long as we qualify as an “emerging growth company” and thus the level of information we provide may be different than that of other public companies. If we do take advantage of any of these exemptions, some investors may find our securities less attractive, which could result in a less active trading market for our common stock, and our stock price may be more volatile. As an “emerging growth company” under the JOBS Act, we are permitted to delay the adoption of new or revised accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. However, we are electing not to take advantage of such extended transition period, and as a result, we will comply with new or revised accounting standards on the relevant dates on which adoption of such standards is required for non-emerging growth companies. Section 107 of the JOBS Act provides that our decision to not take advantage of the extended transition period for complying with new or revised accounting standards is irrevocable.

We could remain an “emerging growth company” until the earliest to occur of:

•

the last day of the fiscal year following the fifth anniversary of this offering;

•

the last day of the fiscal year in which our annual gross revenues exceed $1 billion;

•

the last day of the fiscal year on which we are deemed to be a “large accelerated filer” as defined in Rule 12b-2 under the Securities Exchange Act of 1934, as amended, or the Exchange Act, which would occur if the market value of our common stock held by non-affiliates exceeded $700 million as of the last business day of the second fiscal quarter of such fiscal year; or

•

the date on which we have issued more than $1 billion in non-convertible debt securities during the preceding three-year period.

Results of Operations

Comparison of the Nine Months Ended September 30, 2013 and 2014

The following table sets forth our results of operations for the nine months ended September 30, 2013 and 2014 (in thousands):


	Nine Months Ended September 30,						Increase/ (Decrease)
	2013			2014			Increase/ (Decrease)
Research and development expenses	$	10,497		$	8,274		$	(2,223	)
General and administrative expenses		2,151			2,754			603
Other income (expense), net		(2,734	)		(2,387	)		(347	)

Research and Development Expenses. Our research and development expenses were $10.5 million for the nine months ended September 30, 2013 compared to $8.3 million for the same period in 2014. The decrease in research and development expenses of $2.2 million in the 2014 period was primarily due to decreases of $2.5 million in clinical trial expenses as we completed our Phase 2b trial in HIV-1 infected patients, $2.6 million in lower spending on drug interaction studies and bioavailability studies associated with our HIV program and $0.8 million in lower preclinical activities. These decreases were partially offset by increases of $1.9 million in expenses for our Phase 2b CENTAUR clinical trial, $1.1 million on our Phase 1 study in hepatically impaired patients, $0.4 million in compensation related expenses in 2014 and $0.3 million in regulatory expenses supporting our NASH program. We expect research and development expenses to increase over time as we advance our programs for CVC.

General and Administrative Expenses. Our general and administrative expenses were $2.2 million for the nine months ended September 30, 2013 compared to $2.8 million for the same period in 2014. The increase in general and administrative expenses of $0.6 million in the 2014 period resulted from an increase of $0.2 million stock-based compensation expense related to stock options granted during 2014, $0.2 million for severance

expense related to the termination of employment of our former chief executive officer and $0.2 million in compensation related expenses in 2014. We expect general and administrative expenses to increase over time as we advance our programs, increase our headcount and incur expenses of being a public company.

Other Income (expense), Net.

Changes in components of other income (expense), net were as follows:

Interest Expense. Interest expense increased from $3.0 million for the nine months ended September 30, 2013 compared to $3.8 million for the same period in 2014. The increase in interest expense of $0.8 million was due to an increase in interest payable of $0.8 million associated with the issuance of convertible notes and incremental interest payable on previously outstanding convertible notes, increased interest expense for our term loan outstanding of $0.2 million due to higher balance on our term loan than the comparable period in 2013 offset by lower accretion of debt discounts associated with our convertible debt-to-interest expense of $0.2 million as they became fully accreted.

Change in Fair Value of Warrant Liabilities. The change in fair value of warrant liabilities for the nine months ended September 30, 2013 reflected a decrease in the warrant fair value of $0.2 million compared to a decrease of $1.4 million for the same period in 2014.

Income Taxes

We have incurred net losses and have not recorded any U.S federal or state income tax benefits for losses as they have been offset by valuation allowances.

Comparison of the Years Ended December 31, 2012 and 2013

The following table sets forth our results of operations for the years ended December 31, 2012 and 2013 (in thousands):


	Year Ended December 31,						Increase/ (Decrease)
	2012			2013			Increase/ (Decrease)
Research and development expenses	$	13,757		$	12,413		$	(1,344	)
General and administrative expenses		3,250			2,764			(486	)
Other income (expense), net		(1,842	)		(3,412	)		1,570

Research and Development Expenses. Our research and development expenses were $13.8 million and $12.4 million for the years ended December 31, 2012 and 2013, respectively. The decrease in research and development expense during this period of $1.3 million was primarily due to decreases of $1.7 million in clinical trials expense, $0.9 million in contract manufacturing expense for drug substance, drug product and clinical trial material, and $0.2 million for outside development services as we completed our randomized Phase 2b study in HIV-infected patients. The decrease was partially offset by increases of $0.8 million for preclinical studies and $0.6 million for formulation development. We expect research and development expenses to increase over time as we advance our programs for CVC.

General and Administrative Expenses. General and administrative expenses decreased from $3.3 million for the year ended December 31, 2012 to $2.8 million for the year ended December 31, 2013. The decrease of $0.5 million was due primarily to a reduction in bonus expense of $0.3 million for 2013 compared to 2012. In

addition, in 2012, we incurred $0.2 million of costs associated with the relocation of our corporate headquarters to California. We expect general and administrative expenses to increase over time as we advance our programs, increase our headcount and incur expenses of being a public company.

Other Income (Expense), Net

Changes in components of other income (expense), net were as follows:

Interest Expense. Interest expense increased from $1.9 million for the year ended December 31, 2012 to $3.7 million for the year ended December 31, 2013. In both 2012 and 2013, interest expense included $0.2 million associated with our Square 1 Bank term loan. The increase in interest expense was primarily due to interest payable and the amortization of debt discount and debt issuance costs associated with the issuance of convertible notes totaling $10.0 million in July 2012, $7.0 million in January 2013 and $5.0 million in October 2013.

Change in Fair Value of Preferred Stock Warrant Liability. The change in the fair value of our preferred stock warrant liability for the year ended December 31, 2012 reflected an increase in warrant fair value of $36,000 compared to an increase of $0.3 million for the year ended December 31, 2013.

Income Taxes

For 2012 and 2013, we have incurred net losses and have not recorded any U.S. federal or state income tax benefits for the losses as they have been offset by valuation allowances.

Liquidity and Capital Resources

We have incurred losses since inception and negative cash flows from operating activities for the years ended December 31, 2012 and 2013 and the nine months ended September 30, 2014. As of September 30, 2014, we had a deficit accumulated during the development stage of $103.3 million. We anticipate that we will continue to incur net losses for the foreseeable future as we continue research efforts and the development of our product candidates, hire additional staff, including clinical, scientific, operational, financial and management personnel, and incur additional costs associated with being a public company.

We have funded our operations primarily through the private placement of our equity securities and debt financing. During 2013 and 2014, we received net proceeds of $12.0 million and $8.0 million, respectively, from the issuance of convertible notes and warrants. In June 2014, we borrowed $15.0 million under our term loan with Oxford. We used approximately $0.8 million of the proceeds from this loan to pay off our existing term loan with Square 1 Bank. As of September 30, 2014, we had cash and cash equivalents of $11.8 million.

We plan to continue to fund losses from operations and capital funding needs through future debt and equity financing, as well as potential additional collaborations or strategic partnerships with other companies or through non-dilutive financings. The sale of additional equity or convertible debt could result in additional dilution to our stockholders. The incurrence of indebtedness would result in debt service obligations and could result in operating and financing covenants that would restrict our operations. We can provide no assurance that financing will be available in the amounts we need or on terms acceptable to us, if at all. If we are not able to secure adequate additional funding we may be forced to make reductions in spending, extend payment terms with suppliers, liquidate assets where possible, and/or suspend or curtail planned programs. Any of these actions could materially harm our business.

Our independent registered public accounting firm included an explanatory paragraph in its report on our financial statements as of, and for the year ended December 31, 2013, describing the existence of substantial doubt about our ability to continue as a going concern. This uncertainty arose from our results of operations and financial condition and the conclusion that we did not have sufficient cash to operate for 12 months from

year-end. The 2013 financial statements do not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or the amounts and classification of liabilities that may result from the outcome of this uncertainty. See Note 1 to Notes to Financial Statements for additional information describing the circumstances that led to the inclusion of this explanatory paragraph.

We estimate that our net proceeds from this offering will be approximately $ million after deducting the underwriting discounts and commissions and estimated offering expenses payable by us. Along with our existing cash and cash equivalents of $11.8 million as of September 30, 2014 we expect that the net proceeds from this offering will be sufficient to fund our capital requirements through at least the second quarter of 2016.

Cash Flows

The following table provides a summary of the net cash flow activity for each of the periods set forth below (in thousands):


	Year Ended December 31,						Nine Months Ended September 30,
	2012			2013			2013			2014
Net cash used in operating activities	$	(15,805	)	$	(16,914	)	$	(14,360	)	$	(10,700	)
Net cash provided by (used in) investing activities		3,985			(1	)		—			(130	)
Net cash provided by financing activities		9,833			10,063			5,541			18,550
Net (decrease) increase in cash and cash equivalents		(1,987	)		(6,852	)		(8,819	)		7,720

Comparison of the Nine Months Ended September 30, 2013 and 2014

Net cash used in operating activities was $14.4 million for the nine months ended September 30, 2013 compared to $10.7 million for same period in 2014. Cash used in operating activities for the nine months ended September 30, 2013 consisted primarily of our net loss of $15.4 million which was offset by non-cash items consisting of interest expense on our convertible notes of $1.0 million, the amortization of the debt discount associated with the fair value of our preferred stock warrants of $1.2 million, the amortization of the beneficial conversion feature on our convertible notes of $0.6 million, stock-based compensation expense of $0.3 million and a decrease in the fair value of our warrant liabilities of $0.2 million. Cash used in operating expenses for the nine months ended September 30, 2013 also reflected a decrease in net operating assets of $1.9 million primarily due to decreases in our accounts payable and accrued liabilities related to completion of our Phase 2b HIV clinical trial, drug interaction studies and payments of 2012 annual performance bonuses. Cash used in operating activities for the nine months ended September 30, 2014 consisted primarily of our net loss of $13.7 million which was offset by non-cash items consisting of interest expense on our convertible notes of $1.7 million, the amortization of the debt discount associated with the fair value of our preferred stock warrants of $0.8 million, the amortization of the beneficial conversion feature on our convertible notes of $0.9 million, stock-based compensation expense of $0.5 million and a decrease in the fair value of our preferred stock warrant liabilities of $1.4 million. Cash used in operating expenses for the nine months ended September 30, 2014 also reflected an increase in net operating assets of $0.3 million primarily due to increases in accounts payable and accrued liabilities related to initiation of our Phase 2b CENTAUR clinical trial and related clinical manufacturing activities, our Phase 1 hepatic impairment study, 2014 annual performance bonuses, an increase in prepayment of expenses supporting our Phase 2b CENTAUR clinical trial, and an increase in restricted cash securing a letter of credit associated with our leased corporate headquarters.

Net cash used in investing activities for the nine months ended September 30, 2014 of $0.1 million was due to the purchase of property and equipment primarily related to the move to our new headquarters. There was no cash used for investing activities for the nine months ended September 30, 2013.

Net cash provided by financing activities for the nine months ended September 30, 2013 resulted from proceeds from the issuance of $7.0 million of convertible notes and proceeds received from stock option

exercises of $0.1 million, partially offset by $1.5 million used to make payments on our term loan with Square 1 Bank. Net cash provided by financing activities for the nine months ended September 30, 2014 resulted from net proceeds from our term loan with Oxford Finance of $14.9 million and the issuance of $8.0 million of convertible notes, partially offset by $1.8 million used to repay our term loan with Square 1 Bank and $2.4 million used to pay for expenses associated with our initial public offering.

Comparison of the Years Ended December 31, 2012 and 2013

Cash used in operating activities for 2012 consisted of a net loss of $18.8 million, which was offset by non-cash items such as interest expense on our convertible notes of $0.3 million, the amortization of the debt discount associated with the fair value of our preferred stock warrants of $0.8 million, the amortization of the beneficial conversion feature on our convertible notes of $0.5 million, and $0.4 million for stock-based compensation expense. Cash used in operating activities in 2012 also reflected an increase in net operating assets of $1.0 million primarily due to increases in accounts payable and accrued expenses driven by our Phase 2b trial in HIV-1 infected patients. Cash used in operating activities for 2013 consisted of a net loss of $18.6 million, which was offset by non-cash items such as interest expense on our convertible notes of $1.4 million, the amortization of debt discount associated with the fair value of our preferred stock warrants of $1.3 million, the amortization of the beneficial conversion feature on our convertible notes of $0.8 million and $0.4 million of stock-based compensation expense. In addition, cash used in operating activities for 2013 also reflected a decrease in the fair value of our warrant liabilities of $0.3 million. Net operating assets also decreased by $2.0 million primarily due to lower accounts payable and accrued expenses driven by the completion of our Phase 2b trial in HIV-1 infected patients.

Net cash provided by investing activities of $4.0 million for 2012 consisted primarily of proceeds from maturities of investments. We had no significant investing activities during 2013.

Net cash provided by financing activities for 2012 resulted from net proceeds of $10.0 million from the issuance of our convertible notes in July 2012. This was partially offset by $0.2 million used to make payments on our term loan. Net cash provided by financing activities for 2013 consisted of net proceeds from the issuance of $12.0 million of convertible notes and $0.1 million of proceeds from stock option exercises, partially offset by $2.0 million used to make payments on our term loan.

Operating Capital Requirements

To date, we have not generated any revenues from product sales, and we do not have any approved products. We do not know when, or if, we will generate any revenue from product sales. We do not expect to generate significant revenue from product sales unless and until we obtain regulatory approval of and commercialize one of our current or future product candidates. We anticipate that we will continue to incur losses for the foreseeable future, and we expect the losses to increase as we continue the development of, and seek regulatory approvals for, our product candidates, and begin to commercialize any approved products. We are subject to all of the risks incident in the development of new therapeutic products, and we may encounter unforeseen expenses, difficulties, complications, delays and other unknown factors that may adversely affect our business. Upon the completion of this offering, we expect to incur additional costs associated with operating as a public company. We anticipate that we will need substantial additional funding in connection with our continuing operations.

We believe that the net proceeds from this offering and our existing cash and cash equivalents will be sufficient to fund our operations through at least the second quarter of 2016. However, we will require additional capital to complete the development and commercialization of CVC, if approved, and may also need to raise additional funds sooner to pursue other development activities related to additional product candidates.

Until such time, if ever, as we can generate substantial product revenues, we expect to finance our cash needs through a combination of equity or debt financings, collaborations, strategic partnerships, licensing arrangements or non-dilutive financing. In any event, we do not expect to achieve revenue from product sales

prior to the use of the net proceeds from this offering. We do not have any committed external source of funds. Additional capital may not be available on reasonable terms, if at all. To the extent that we raise additional capital through the sale of stock or convertible debt securities, the ownership interest of our stockholders will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of our common stockholders. Debt financing, if available, may involve agreements that include increased fixed payment obligations and covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures, declaring dividends, selling or licensing intellectual property rights and other operating restrictions that could adversely impact our ability to conduct our business. If we raise additional funds through collaborations, strategic partnerships or licensing arrangements with third parties, we may have to relinquish valuable rights to CVC or our other product candidates, including our other technologies, future revenue streams or research programs, or grant licenses on terms that may not be favorable to us. If we are unable to raise additional funds through stock offerings or debt financings when needed, we may be required to delay, limit, reduce or terminate our product development or future commercialization efforts or grant rights to develop and commercialize CVC or our other product candidates even if we would otherwise prefer to develop and commercialize such product candidates ourselves.

Contractual Obligations and Commitments

The following table summarizes our principal contractual obligations and commitments as of December 31, 2013 that will affect our future liquidity (in thousands):


	Total		Less than 1 Year		1 – 3 Years		3 – 5 Years		More than 5 Years
Short-term debt^{(1) (2)}	$	1,833	$	1,833	$	—	$	—	$	—
Interest on short-term debt⁽²⁾		56		56		—		—		—
Lease obligations⁽³⁾⁽⁴⁾⁽⁵⁾		137		137		—		—		—

Total	$	2,026	$	2,026	$	—	$	—	$	—

(1)

Our commitment for short-term debt is comprised of amounts outstanding under the Square 1 Bank term loan. The term loan matures in November 2014 and accrues interest at a rate of 6% per year. The term loan provides for interest-only payments through November 2012 and payments for 24 months of principal and interest thereafter. We paid off our term loan with Square 1 Bank with proceeds from our $15.0 million term loan with Oxford in June 2014.

(2)

Excludes an aggregate principal amount of $22.0 million plus accrued and unpaid interest on convertible notes outstanding as of December 31, 2013. In addition, in March 2014, we issued an additional $8.0 million aggregate principal amount of convertible notes. All of the convertible notes and accrued and unpaid interest thereon will be converted ultimately into common stock immediately prior to the completion of this offering.

(3)

Consists of our corporate headquarters lease encompassing approximately 7,000 square feet of office space that expires in August 2014.

(4)

On May 16, 2014, we entered into a five-year operating lease agreement for a new corporate headquarters for approximately 7,400 square feet of office space. The lease term and allocated minimum lease payments, which are in aggregate $1.5 million over the initial term of five years, commenced August 8, 2014.

(5)

On June 20, 2014, we entered into two capital leases for office equipment associated with our new corporate headquarters. The lease terms and minimum lease payments, which are in the aggregate $80,000 over the lease terms of 3 years, commenced in August 2014.

Contractual Arrangements

In August 2007, we entered into a license agreement with Takeda relating to CVC (then known as TAK-652) and TAK-220. Under the agreement, Takeda assigned to us certain patents relating to CVC and

TAK-220. Under the agreement, we paid to Takeda an upfront license fee of $3.0 million and are obligated to pay to Takeda up to $102.0 million in the aggregate in development and sales milestones. We are also obligated to pay to Takeda tiered royalties based on aggregate annual net sales of all licensed products from the high single digit to the low double digit percentage of net sales, subject to certain reductions and exceptions. Our obligation to pay royalties to Takeda expires on a country-by-country basis on the later of either expiration of the last to expire patent assigned to us under the agreement, or the earlier of the twelfth anniversary of the first commercial sale of the product or one or more generic versions of the product achieving a certain market share in such country.

We enter into contracts in the normal course of business with CROs and clinical sites for the conduct of clinical trials, preclinical research studies, professional consultants for expert advice and other vendors for clinical supply manufacturing or other services. These contracts generally provide for termination on notice, and therefore are cancelable contracts and not included in the table of contractual obligations and commitments.

Oxford Term Loan

In June 2014, we entered into a $15.0 million, four-year term loan with Oxford. Our obligations under the term loan are secured by a first priority security interest in all existing and future assets, except intellectual property unless otherwise determined by applicable judicial authority. The term loan bears interest at 6.954% per annum with interest only payments through December 31, 2015 followed by 30 equal monthly payments of principal and interest until maturity at June 1, 2018. At the time of final payment, we are required to pay an exit fee of 4% of the total loan amount. In addition, we issued Oxford warrants to purchase an aggregate of 36,207 shares of Series B preferred stock at an exercise price of $14.50 per share, subject to adjustment for stock splits, recapitalizations and certain other events. The warrants are exercisable for seven years from the date of issuance. We used approximately $0.8 million of the proceeds of this loan to pay off our existing term loan with Square 1 Bank.

Off-balance Sheet Arrangements

We do not have any off-balance sheet arrangements as defined in the rules and regulations of the SEC.

Quantitative and qualitative disclosures about market risk

Interest Rate Risk

Our cash and cash equivalents as of September 30, 2014 consisted of readily available checking and money market funds. Our primary exposure to market risk is interest income sensitivity, which is affected by changes in the general level of U.S. interest rates. However, because of the short-term nature of the instruments in our portfolio, a sudden change in market interest rates would not be expected to have a material impact on our financial condition and/or results of operations. We do not believe that our cash or cash equivalents have significant risk of default or illiquidity. While we believe our cash and cash equivalents do not contain excessive risk, we cannot provide absolute assurance that in the future our investments will not be subject to adverse changes in market value. In addition, we maintain significant amounts of cash and cash equivalents at one or more financial institutions that are in excess of federally insured limits.

Effects of Inflation

Inflation generally affects us by increasing our cost of labor and clinical trial costs. We do not believe that inflation and changing prices had a significant impact on our results of operations for any periods presented herein.

Internal Control Over Financial Reporting

Pursuant to Section 404(a) of the Sarbanes-Oxley Act, commencing the year following our first annual report required to be filed with the SEC, our management will be required to report on the effectiveness of our internal control over financial reporting. To comply with the requirements of being a reporting company under the Exchange Act, we may need to upgrade our systems, including information technology, implement additional financial and management controls, reporting systems and procedures and hire additional accounting and finance staff. For more information, please see “Risk Factors—If we fail to maintain proper and effective internal control over financial reporting in the future, our ability to produce accurate and timely financial statements could be impaired, which could harm our operating results, investors’ views of us and, as a result, the value of our common stock.”

BUSINESS

Company Overview

We are a clinical-stage biopharmaceutical company focused on the development and commercialization of innovative therapeutics to treat liver disease, human immunodeficiency virus, or HIV, fibrosis and inflammation. Our lead product candidate, cenicriviroc, or CVC, is a proprietary immunomodulator that can potentially be used to treat a number of disease states with high unmet medical need. We are developing CVC for nonalcoholic steatohepatitis, or NASH, for which we are enrolling a Phase 2b clinical trial. CVC is a once-daily pill with well-established safety and tolerability in approximately 580 subjects dosed in completed Phase 1 and Phase 2 trials, including a pharmacokinetics (PK) and safety study in subjects with liver cirrhosis and 115 HIV type 1, or HIV-1, infected subjects on treatment for up to 48 weeks. We also plan to advance CVC in a fixed-dose combination for HIV-1 infection through Phase 3 development and commercialization in collaboration with a strategic partner or with non-dilutive financing.

NASH is a serious inflammatory type of non-alcoholic fatty liver disease, or NAFLD, commonly associated with obesity, type-2 diabetes and related metabolic disorders. NASH may evolve from fibrosis to cirrhosis and may lead to liver cancer or liver failure. Due to the growing epidemic of obesity and diabetes, NASH is projected to be the most common cause of advanced liver disease and the most common reason for liver transplant by 2020. The NASH market opportunity is estimated to be three to five times that of hepatitis C virus, or HCV, in the United States. NASH prevalence is estimated to be approximately 9 million to 15 million people in the United States, or 3%-5% of the U.S. population, with similar prevalence in other major markets. However, a significantly higher prevalence has been reported in patient segments at greater risk. For example, NASH has been observed in approximately 33% of obese patients in various studies.

There are no approved therapies for NASH. Current guidelines recommend managing NASH patients through lifestyle modifications and the treatment of comorbidities including obesity, diabetes and related disorders. Although these patient management options may provide some benefit, they are generally suboptimal and have limited impact. Accordingly, the NASH market has a significant unmet need for pharmacological options that are effective and well tolerated for this chronic condition. We believe CVC has the potential to address this unmet need based on its dual inhibitor mechanism of action as well as clinical and preclinical evidence. In our completed Phase 2b study of CVC in HIV-1 infected subjects, we observed a reduction in the percentage of patients with elevated fibrosis risk scores. We have also seen anti-fibrotic effects across three animal models of liver and kidney disease. Finally, our clinical program of CVC to date includes safety

and dosing data from approximately 580 subjects including a recently completed PK and safety study in subjects with liver cirrhosis and our Phase 2b HIV study which treated 115 subjects for up to 48 weeks.

We are also developing CVC as part of a fixed-dose backbone in combination with lamivudine, or 3TC, for the treatment of infection by HIV-1, the virus that causes acquired immunodeficiency syndrome, or AIDS. A fixed-dose combination product contains at least two pharmaceutical agents in a single tablet, in this case CVC and lamivudine, and may then be tested or used in combination with additional therapies to provide a complete anti-retroviral regimen. The term “backbone” is commonly used in the context of HIV treatment to describe fixed-dose combination products which may be used with other HIV drugs and allow for a variety of three-drug combinations. CVC inhibits CCR5, the primary co-receptor required for HIV-1 to infect immune cells. Despite the availability of potent and well-tolerated classes of anti-HIV therapeutics, patients on chronic therapy face

toxicities due to lifelong treatment and are particularly at risk for metabolic, cardiovascular and renal disease complications. The greatest unmet need in HIV therapy is for improved tolerability in this chronic treatment setting. U.S. sales of HIV therapies are forecasted to be $9.6 billion in 2014 and growing to $12.8 billion in 2020, according to Datamonitor.

We believe that CVC’s inhibition of CCR2 may have immuno-inflammatory benefits in HIV-1 infected individuals at increased risk of liver, cardiovascular and kidney diseases. We have completed a 143 patient randomized double-blind controlled Phase 2b study of CVC versus efavirenz, or EFV, both in combination with emtricitabine, or FTC, and tenofovir disoproxil fumarate, or tenofovir DF or TDF. In this study, CVC demonstrated comparable levels of viral control to EFV as well as a favorable safety and tolerability profile with fewer treatment-related adverse events, or AEs, over 48 weeks. We met with the FDA in an end-of-Phase 2 meeting in September 2013, where the U.S. Food and Drug Administration, or FDA, concurred that available safety and efficacy data support further evaluation in Phase 3 registration studies of CVC and CVC/3TC. We intend to conduct these studies of CVC as part of a novel fixed dose combination backbone with 3TC. We believe that CVC/3TC has the potential to address the need for improved tolerability in chronic HIV treatment. We have developed a novel fixed-dose single tablet of CVC/3TC and plan to open an IND for this product candidate and advance our HIV-1 clinical program into Phase 3 development in collaboration with a strategic partner or with non-dilutive financing.

In addition, we believe CVC has the potential to be studied in the treatment of other CCR2 and CCR5 mediated inflammatory and fibrotic driven diseases such as kidney fibrosis, graft-versus-host disease, or GVHD, and certain cancers.

Below is our clinical and preclinical pipeline:

LOGO

Strategy

Our goal is to become a leading biopharmaceutical company developing and commercializing innovative immunomodulatory therapies for liver diseases, HIV, fibrosis and inflammation. To achieve our goal, we plan to:

•

primarily managed by a concentrated group of liver specialists in the United States. We believe this will enable us to launch CVC in NASH in a cost-effective, targeted manner.

•

Advance the clinical development program for CVC in HIV-1 in collaboration with a strategic partner or with non-dilutive financing. We have obtained initial evidence of efficacy and safety in a Phase 2b clinical trial of CVC in HIV-1 infected patients. We intend to seek collaborators or non-dilutive financing to initiate and complete Phase 3 clinical testing of a fixed-dose combination backbone of CVC/3TC in HIV-1 infected patients and seek approval of this novel CVC-containing regimen for use in combination HIV therapy with third agents.

•

Opportunistically grow our pipeline through additional indications for CVC and in-licensing opportunities. We believe that CVC has the potential to be an effective immunomodulatory treatment for other CCR2 and CCR5 mediated inflammatory and fibrotic driven diseases such as kidney fibrosis, GVHD and certain cancers. For example, results from a study of kidney fibrosis in mice were presented at the International AIDS Conference in July 2014. We will continue to seek ways to broaden our pipeline and leverage our capabilities and expertise.

NAFLD and NASH Disease Overview

NAFLD is the most common liver disease and is associated with obesity and type-2 diabetes. The disease is characterized by the accumulation of fat in the liver with no other apparent causes. In the United States, NAFLD affects approximately 27%-34% of the population, or an estimated 86 million to 108 million people. NASH is a more advanced and severe subtype of NAFLD. The rising prevalence of obesity-related disorders has contributed to a rapid rise in the prevalence of NASH. Approximately 10%-20% of patients with NAFLD will progress to NASH. Current estimates place NASH prevalence to be approximately 9 million to 15 million people in the United States, or 3%-5% of the U.S. population, with similar prevalence in the EU and China. Prevalence is also rising in developing regions, likely due to people in these regions starting to adopt a more sedentary lifestyle and westernized diet consisting of processed food with high fat and fructose content.

In addition to the accumulation of fat in the liver, NASH is characterized by inflammation and cellular damage with or without fibrosis. NASH is a severe condition that can lead to fibrosis, the formation of excess fibrous connective tissue in an organ or tissue in a reparative or reactive process, and eventually progress to cirrhosis, portal hypertension, esophageal varices, ascites, liver cancer and/or liver failure. Progression to cirrhosis and other late stage complications can occur within 5 to 10 years after initial NASH diagnosis. NASH patients with obesity and/or type-2 diabetes are at a significantly higher risk of disease progression. Once the disease advances beyond NASH to these life-threatening conditions, liver transplantation is the only alternative. The Centers for Disease Control and Prevention, or CDC, projects the prevalence of obesity to increase from 34% of the U.S. population to 42% by 2030. Driven by the epidemic of obesity, NASH is projected to become the leading indication for liver transplant by 2020. Given the extremely limited availability of organ donors and high transplant costs, NASH patients who progress to require transplantation will place a significant economic burden on the healthcare system.

There is a significant unmet need for well-tolerated oral treatments for NASH. As there are no approved pharmaceutical agents for NASH, its market size is difficult to estimate. However, we believe there is a significant market opportunity in NASH and that other well-established markets targeting liver disease, such as HCV, provide a good basis for comparison. HCV affects 3.2 million people in the United States and is forecasted by Datamonitor to have $19.2 billion of drug sales in 2016. We believe that NASH, with no cure or effective treatment available, is a significantly larger market opportunity than HCV as the prevalence of NASH is estimated to be three to five times that of HCV in the United States.

Pathophysiology of NASH

NAFLD is increasingly recognized as the liver’s manifestation of insulin resistance and is often present with obesity-related disorders and type-2 diabetes. The understanding of the mechanism of progression from healthy liver status through the stages of NAFLD to NASH and on to life-threatening complications continues to evolve. At

the early stages of the spectrum of NAFLD, fat accumulates within the liver, a condition known as steatosis. Liver steatosis alone is normally benign and slow or non-progressive during the earlier stage of NAFLD, known as non-alcoholic fatty liver or NAFL. NASH defines a subgroup of NAFLD patients in whom steatosis is complicated by liver-cell injury and inflammation, a condition known as steatohepatitis. Although liver damage due to NASH has some of the characteristics of alcoholic liver disease, it occurs in people who drink little or no alcohol. NASH can lead to progressive liver fibrosis, cirrhosis and liver cancer. In addition to insulin resistance, altered fat storage and metabolism, accumulation of cholesterol within the liver and resulting cellular damage leading to increased hepatic injury have all been implicated as important co-factors contributing to the progression of NASH. The presence of liver cell damage, or ballooning, marked inflammation and/or fibrosis distinguishes NAFL from NASH.

The following image provides an overview of the progression of NAFLD from a healthy liver to cirrhosis:

LOGO

The immune and inflammatory response to liver cell damage is mediated through a well-described signaling network of liver and immune cells. Kupffer cells, also known as resident liver macrophages, can sense tissue injury and are the first responders to liver cell damage. Activated Kupffer cells initiate an inflammatory response to the liver injury. This includes active secretion of a signaling protein called CCL2, also known as monocyte chemotactic protein-1, or MCP-1, which is the ligand that binds to CCR2. Increased levels of CCL2 promote migration of bone marrow-derived pro-inflammatory monocytes that enter the liver, where they later mature into pro-inflammatory macrophages. Together, and through signaling proteins such as transforming growth factor beta, or TGF-b, and platelet-derived growth factor, or PDGF, Kupffer cells and pro-inflammatory macrophages can activate HSCs to transdifferentiate into myofibroblasts, the primary collagen-producing cell type responsible for liver fibrosis.

The following image illustrates the inflammatory response to liver cell damage resulting in fibrogenesis:

LOGO

Collagen production, or fibrogenesis, is part of the temporary healing process that is normally followed by collagen degradation, or fibrolysis, and regeneration of healthy liver cells. Progressive liver fibrosis comes as a result of chronic inflammation and excessive collagen production that is not sufficiently degraded and replaced by healthy cells. A condition of chronic liver injury such as NASH can result in excess inflammation and collagen accumulation, which in turn displaces normal functioning liver cells.

Portal or localized fibrosis, which occurs in the earlier stages of the disease, can progress to severe fibrosis and cirrhosis, causing liver stiffness and greatly reduced function. About one-third of patients diagnosed with early-stage NASH progress to severe fibrosis or liver cirrhosis, which is associated with increased hospitalizations and mortality. Cirrhosis increases blood pressure through the liver, known as portal hypertension, and inhibits normal liver function. Of NASH patients who eventually progress to cirrhosis, 25% will develop major complications of portal hypertension, such as hepatic encephalopathy and esophageal varices, within three years and, in some studies, liver cancer has been seen to eventually develop in over 40% of these patients.

Additionally, preclinical and clinical studies over the last decade have suggested the role of bacterial translocation, the passage of bacteria and toxins, or endotoxins, from the gastrointestinal tract to extraintestinal sites in the pathogenesis of NASH. Specifically, altered or increased intestinal permeability, also known as leaky gut, are associated with both bacterial translocation and the pathogenesis of NASH. Leaky gut leads to increased liver injury and initiates the inflammation and fibrosis process, mainly through the activation of Kupffer cells. Bacterial translocation has also been observed in HIV-1 infected patients where it is associated with key comorbidities such as cardiovascular disease.

Current Management and Unmet Need in NASH

Currently, NASH and NAFLD are underdiagnosed due to poor disease awareness, the insufficiency of non-invasive diagnostic tools and the lack of effective approved therapies. Patients are often diagnosed after a blood test demonstrating elevated levels of liver enzymes, alanine aminotransferase, or ALT, and aspartate aminotransferase, or AST. A confirmed diagnosis of NASH currently requires a liver biopsy. Advances in non-invasive diagnosis and composite scoring will continue to evolve for NASH, potentially offering alternatives for diagnosis.

Liver biopsies are required to determine the NAFLD Activity Score, or NAS. The NAS system evaluates and scores three categories on a low to high point scale system: (i) steatosis (0-3), (ii) hepatocyte ballooning, which is a form of damage to liver cells (0-3) and (iii) inflammation of the liver (0-2). The three categories are totaled and scores range from 0 to 8, with a score of 0-2 mainly occurring in patients who are negative for NASH. Scores of 3-4 are borderline positive for NASH, while scores of 5-8 occur in patients largely considered to be diagnostic of NASH.

There are no approved therapies for NASH. The NASH market has a significant unmet need for pharmacological options that are effective and well tolerated. Current options for managing patients with NASH are suboptimal and primarily rely on lifestyle changes, off-label pharmacotherapy and bariatric surgery for weight loss. Each of the patient management options described below may provide some benefit, but all have limitations. We believe there are no other product candidates in development or approved that target the immuno-inflammatory pathways responsible for fibrosis.

Lifestyle Intervention. Lifestyle modifications, specifically weight loss, are recommended for NASH patients. However, lifestyle changes are only considered clinically significant when patients are able to reduce more than 7% of their body weight, which occurs in less than 50% of NASH patients.

Off-label Pharmacotherapy. Products utilized off label in the management of NASH comorbidities include vitamin E, insulin sensitizers such as metformin and pioglitazone, which are used for diabetic patients, and anti-hyperlipidemic agents, pentoxifylline, and ursodiol. High-dose vitamin E has been shown in a clinical study of non-diabetic patients to reduce inflammation but not fibrosis. Vitamin E is not recommended for NASH patients with type-2 diabetes due to lack of data, therefore the use of vitamin E is limited. Other off-label pharmacotherapies demonstrate inconsistent benefits or are associated with significant side effects.

Bariatric Surgery. Bariatric surgery is believed to impact NASH through dramatic weight loss, but it has significant complications and drawbacks. These include a host of perioperative risk factors, the need to adhere to post-surgical diet and nutritional regimens and high costs. A relatively small number of these procedures are performed annually on NASH patients compared to the overall NASH population, which we believe is due to the complications and drawbacks of bariatric surgery relative to NASH patient numbers. Because of the large number of patients who would require bariatric surgery for NASH, we also believe that the relatively high cost of this procedure makes its widespread adoption impractical. In addition, some retrospective and prospective studies have indicated that the procedure may worsen fibrosis.

Liver Transplant. Liver transplant is a last resort for life-threatening complications progressing from NASH. NASH is currently the third most common reason for liver transplants in United States and is projected to surpass alcohol-based cirrhosis and viral hepatitis to become the leading indication for liver transplant by 2020. The availability of liver donors is extremely limited and the cost of a liver transplant is a significant economic burden, with an estimated cost per procedure of approximately $577,000. Studies have demonstrated that approximately 23% of patients do not survive the five-year period post-transplant.

Recent scientific advances in understanding the pathophysiology of NASH have led to the development of new investigational drugs with the potential to address the disease through various mechanisms. CVC’s immunomodulatory mechanism of action has the potential to play a differentiated role in the management of NASH. We believe that the eventual management of the disease will include multi-targeted combination treatment approaches.

Mechanism of CVC in NASH

CVC is a first-in-class oral, long-acting, once-daily immunomodulator that is a potent dual inhibitor of CCR2 and CCR5 with anti-inflammatory and anti-fibrotic activity. CVC may improve NASH and stop the progression of fibrosis by:

•

Reducing chronic liver inflammation. We expect CVC to inhibit the CCR2 signaling pathway, blocking the excessive infiltration of pro-inflammatory cells, or monocytes and macrophages, to the liver initially triggered by cellular damage.

•

Disrupting immune signaling pathways within the liver. CVC inhibits the CCR2 and CCR5 signaling pathways, which are key mechanisms of immune cell activation and activation of Kupffer cells and HSCs, both key drivers of fibrogenesis.

•

Reducing liver injury from leaky gut. CVC may reduce the impact of bacterial translocation from the gut that contributes to increased liver injury, inflammation and fibrosis.

CVC decreases recruitment, migration and infiltration of pro-inflammatory monocytes to the site of liver injury mainly via CCR2 inhibition, thereby reducing chronic liver inflammation and fibrosis. Due to its dual inhibitory activity on CCR2 and CCR5, CVC also disrupts important signaling pathways or “cross-talk” within the inflamed liver resulting in decreased Kupffer cell and HSC activity and reduced fibrogenesis, as illustrated by the following image:

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CVC blocks the binding of key ligands involved in the immuno-inflammatory cascade, including RANTES (Regulation on Activation Normal T-cell Expressed and Secreted), Macrophage Inflammatory Protein (MIP-1a and MIP-1b) to CCR5, and MCP-1, also known as chemokine (C-C motif) ligand 2 (CCL2), to CCR2.

The link between CCR2 and immune cell activation and fibrosis has been well established. In a study of fibrosis in mice, mice with a targeted deletion of CCR2 exhibited less immune cell activation and markedly reduced fibrosis. In addition, levels of CCL2 in the liver have been shown to correlate with the level of immune cell infiltration in the liver during fibrosis in humans and mice. In preclinical studies, CVC inhibited the binding of CCR2 at very low concentrations.

CCR5 has also been shown to play a central role in liver fibrosis. CCR5 is up-regulated in patients with liver cirrhosis, confirming the activation of this pathway in fibrogenesis. In a mouse model of fibrosis, mice without the expression of CCR5 exhibited reduced liver fibrosis and decreased activation of HSCs as compared to normal mice. In preclinical studies, CVC inhibited the binding of CCR5 at very low concentrations.

In addition, we believe CVC has potential to positively impact the leaky gut thereby reducing liver injury. In a randomized 48-week Phase 2b study of HIV-1 patients treated with CVC, the results showed decreases in plasma levels of soluble CD14, a biomarker of monocyte activation and of bacterial translocation. Soluble CD14 is known to be an independent predictor of mortality in HIV patients.

Preclinical CVC Studies in NASH

We have investigated CVC in two well characterized animal models for NASH and liver fibrosis. We demonstrated significant anti-fibrotic activity of CVC and no adverse effects on vital organ systems. We believe that these models are relevant as they are representative of the pathophysiology of NASH and fibrosis in a clinical setting.

NASH mouse model

A NASH mouse model, combining glucose intolerance and high fat diet, two key components of NASH in humans, was used to study potential effects of CCR2 and CCR5 antagonism on liver fibrosis. Endpoints of the study included body and liver weight, plasma and liver biochemistry, histopathologic analyses and gene expression. In this model, insulin resistance was induced in male mice by a single injection of 200 µg streptozotocin, or STZ, two days after birth, followed by a high-fat diet, or HFD, beginning at 4 weeks of age. From 6 to 9 weeks of age, 3 groups of animals (n=6/group) received CVC at doses of 0 (vehicle control), 20 (low dose) or 100 (high dose) mg/kg/day. At 9 weeks of age, biochemical, gene expression and histological evaluations of the liver were conducted in a blinded manner.

The following image shows the study design of the NASH mouse model:

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In the Week 9 analysis, CVC treatment had no effect on body or liver weight, whole blood glucose or liver triglyceride levels. Mean measurements of ALT levels, which is an enzyme in the blood that may be elevated with the occurrence of liver damage, were significantly decreased in both CVC treatment groups compared to the control group (133 ± 80, 58 ± 12 and 52 ± 13, units/liter for vehicle, low and high dose CVC, respectively; p ¹<0.05), as illustrated by the following chart:

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The mean percentage of fibrosis area was significantly decreased by CVC treatment relative to control (0.61% ± 0.23%, 0.29% ± 0.14% and 0.20% ± 0.06% for 20 mg/kg/day, 100 mg/kg/day and control, respectively; p<0.01), as illustrated by the following chart:

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A p-value is a statistical measurement that describes the probability that the observed effects of CVC were statistically significant compared to the control group. A p-value of less than 0.05 suggests statistical significance to the results observed.

In addition, gene expression of collagen type 1 in whole liver lysates decreased by 27%–37% with CVC treatment. Importantly, the mean NAS was significantly decreased with CVC treatment (5.3±0.5, 4.0±0.6 and 3.7±0.8 for vehicle, low and high dose CVC, respectively; p<0.05), primarily based on reduced inflammation and ballooning scores, as noted in the following table:


Score		Vehicle (N=6)	CVC 20 mg/kg/day (N=6)	CVC 100mg/kg/day (N=6)
Steatosis	0			1
	1	4	6	5
	2	2
	3
Lobular inflammation	0
	1		3	3
	2	6	3	3
	3
Hepatocyte ballooning	0			1
	1		3	2
	2	6	3	3
NAS, mean (±SD)		5.3 (±0.5)	4.0 (±0.6)	3.7 (±0.8)
CVC vs vehicle			P<0.05	P<0.01

Rat liver fibrosis model

A 12-week rat liver fibrosis model was utilized to determine if CVC has anti-fibrotic effects in rats with thioacetamide, or TAA, induced liver injury and evaluate the timing of treatment intervention relative to disease onset. TAA is a known toxin widely used for fibrosis induction in animal models. In this model, fibrosis was induced in male Sprague-Dawley rats by intraperitoneal, or IP, administration of TAA at a dose of 150mg/kg, 3 times a week, for 8 weeks. Rats received CVC at doses of 0 (vehicle control), 30 mg/kg/day (low dose) or 100 mg/kg/day (high dose), as illustrated by the following image.

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With early intervention, or Group 1 (concurrent treatment of TAA and CVC for 8 weeks), liver collagen was significantly decreased by CVC at low and high dose (49% and 38%, respectively) compared to control (p<0.001). Protein levels of collagen type-1 protein and alpha smooth muscle actin were also decreased in the CVC treatment groups. With emerging fibrosis intervention, or Group 2 (TAA for 8 weeks, CVC from Weeks 4 to 8), the low dose of CVC significantly decreased liver collagen by 36% (p<0.001) but no reduction was seen

with the high dose. CVC treatment had no effect once cirrhosis was established, or Group 3 (TAA for 8 weeks, CVC for 4 weeks after cessation of TAA administration).

This study was conducted by Dr. Scott Friedman, Chief of the Division of Liver Diseases at the Mount Sinai Medical Center in New York City. Dr. Friedman presented the results from the NASH mouse model study and the rat TAA-induced fibrosis study at the American Association for the Study of Liver Disease, or AASLD, annual meeting in November 2013.

The following image illustrates the anti-fibrotic effects in rats treated with CVC:

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Mouse kidney fibrosis model

A unilateral ureteral obstruction, or UUO, model was conducted in mice to determine the effect of CVC on kidney fibrosis. In this model, kidney fibrosis can be induced in mice within five days of ureteral obstruction. Mice underwent sham surgery and were treated with vehicle control or ligation of the right ureter and treated with either vehicle control or 7 mg/kg/day or 20 mg/kg/day of CVC. After five days of treatment, the extent of kidney fibrosis was measured using histological and biochemical evaluation, in a blinded fashion.

In the study, excluding one mouse with aberrant results, both dose groups of CVC showed a statistically significant reduction in kidney fibrosis using histological evaluation, compared to vehicle control. Biochemical evaluations of fibrosis markers (mRNA expression and hydroxyproline protein content) of both dose groups of CVC were numerically favorable compared to vehicle but did not reach statistical significance. The study included an active control that reached statistical significance across multiple histological and biochemical endpoints. The study also included a third CVC group dosed at 100 mg/kg/d. Based on the results of this third group, we decided not to pursue the highest dose. We believe these data provide additional evidence of the anti-fibrotic mechanism of CVC which may be relevant to the treatment of NASH with fibrosis as well as other fibrotic indications such as diabetic nephropathy.

Safety and Pharmacokinetics of CVC

We have conducted several nonclinical studies to characterize the mechanism, efficacy, safety and toxicology of CVC. We have demonstrated the safety of CVC in animals, with no behavioral or physiologic changes observed in treated animals or notable effects on cardiovascular, respiratory or other systems. No significant safety findings were observed across preclinical studies that evaluated dose levels of CVC and with

oral doses in rodents up to greater than 38 fold the currently used clinical dose level equivalents. CVC has nanomolar potency against both CCR2 and CCR5. In ex-vivo studies, CVC inhibited CCR5 with an IC₅₀ of 3.1 nanomoles and CCR2 with an IC₅₀ of 5.9 nanomoles.

CVC has been evaluated in a total of 17 completed Phase 1 and Phase 2 clinical trials in approximately 580 healthy volunteers and patients with HIV-1. CVC has demonstrated a favorable safety and tolerability profile, including in a 48-week Phase 2b study of CVC in which 115 HIV-1 infected patients were treated with CVC. Across the completed clinical trials, most adverse events observed had been mild or moderate in severity. The most commonly reported treatment-emergent adverse effects were nausea, diarrhea, headache, rash, fatigue and upper respiratory tract infection. CVC has also been tested in Phase 1 and Phase 2 clinical studies in regimens including ritonavir, atazanavir/ritonavir, darunavir/ritonavir, tenofovir disoproxil fumarate, efavirenz, dolutegravir, midazolam and emtricitabine/tenofovir disoproxil fumarate.

The pharmacokinetic and pharmacodynamic, or PK/PD, characteristics of CVC have been well characterized in both healthy volunteers and patients. Pharmacokinetics refers to the study of drug absorption, distribution, metabolism and elimination when administered to patients. Pharmacodynamics refers to the study of the effects a drug has on a patient, including the mechanism of action of the drug and effects of various doses or concentrations of the drug. We have shown good bioavailability of CVC as an oral, single tablet formulation. With a long half-life of 30-40 hours, CVC is dosed once daily, making it convenient for long-term treatment and improved patient adherence. No dose-limiting toxicities have been observed to date.

Clinical Evidence of Anti-inflammatory and Anti-fibrotic Activity of CVC

In addition to the anti-fibrotic effects of CVC demonstrated in preclinical models, we have gathered supportive evidence of similar properties in humans through our clinical Phase 2b study, conducted in 143 HIV-1 infected subjects treated with CVC for up to 48 weeks. Liver disease is prevalent in HIV-infected patients, can occur with or without viral hepatitis co-infection, and has emerged as a major cause of morbidity and mortality.

As part of assessing the potential benefits of CVC in subjects with NASH and liver fibrosis, we retrospectively calculated two well-established fibrosis risk scores, APRI (AST to platelet ratio index) and FIB-4 (Fibrosis-4) in this HIV study. These fibrosis risk scores were calculated based on standard blood chemistry tests. An APRI score below 0.5 and a FIB-4 score below 1.45 have each independently been shown to be predictive of the absence of clinically significant liver fibrosis while an APRI score above 0.5 and a FIB-4 score above 1.45 are predictive of the presence of fibrosis. In addition, scores above each of these respective thresholds have been independently shown to be associated with statistically significant increase in progression to negative clinical outcomes defined as death, liver transplantation, or cirrhosis complications in patients with NASH. Our pooled analysis of all CVC-treated subjects assessed the fibrosis scores at baseline and following 24 and 48 weeks of treatment and revealed that improvements of these fibrosis risk scores were observed with CVC over time. A total of 113 subjects were evaluable at baseline; 92 subjects had paired data at baseline and Week 24, and 80 subjects had paired data at baseline and Week 48.

The following chart illustrates the decreasing proportion of CVC-treated subjects with elevated APRI and

FIB-4 scores:

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CVC was also shown to lower plasma levels of soluble CD14, or sCD14, a biomarker of monocyte activation, inflammation, and of bacterial translocation. Serum levels of sCD14 have been shown to be correlated with increased hepatic CD14 expression and liver inflammation in NASH patients and be significantly associated with diagnosis of NASH. The chart below illustrates the decrease in sCD14 levels observed in our Phase 2b study in HIV-1 infected subjects:

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In addition, our pooled analysis of all CVC treated subjects with elevated fibrosis scores at baseline revealed that reductions in sCD14 were positively correlated with both reductions in APRI and FIB-4 fibrosis scores.

Decreases in sCD14 observed in CVC-treated patients were significantly correlated with improvements in APRI and FIB-4 scores at Week 48, suggesting that decreases in monocyte activation were associated with decreased risk of clinically significant liver fibrosis.

Phase 1 Pharmacokinetic (PK) and Safety Study in Subjects with Mild to Moderate Liver Impairment

We recently completed a Phase 1 study to compare the PK and safety of CVC in a total of 31 adult subjects with either mild to moderate liver impairment (Child-Pugh score of A or B, respectively; N=16) compared to healthy subjects with normal hepatic function matched for age, body weight and gender (N=15). Child-Pugh is a well-established medical score used to assess the severity of liver disease that incorporates total bilirubin, serum albumin, prothrombin time, ascites and hepatic encephalopathy. Cirrhotic patients can be classified as having mild (Child-Pugh A), moderate (Child-Pugh B) or severe (Child-Pugh C) liver impairment. Patients with “normal hepatic function” are those without known liver disease and do not meet the criteria of the Child-Pugh classification.

The study assessed the PK, safety and tolerability of CVC in subjects with liver impairment compared with that of healthy subjects. CVC was administered orally, once daily for 14 days at 150mg. CVC concentrations were not increased in subjects with mild hepatic impairment compared to matched healthy controls and were increased by approximately 50% in subjects with moderate hepatic impairment. CVC was generally well tolerated, regardless of hepatic impairment. All adverse events, or AEs, were mild or moderate in severity, except for an AE of ‘liver function test abnormal’ of severe intensity reported in a moderately impaired subject with an 18-year history of cirrhosis and hepatitis C; this AE resolved, and CVC dosing was completed without treatment interruption. AEs occurring in ³ 2 subjects were headache (N=5), dry mouth (N=2), epigastric discomfort (N=2), and flatulence (N=2). No serious AEs were reported. Based on these findings, no dose adjustment is anticipated in patients with mild or moderate hepatic impairment. We continue to conduct additional analyses of the results of this study, including evaluation of pro-inflammatory cytokines and markers of bacterial translocation, and have submitted an abstract for presentation for a 2015 scientific conference.

Ongoing and Planned Clinical Studies for NASH

Development Plan in NASH: CENTAUR Phase 2b Proof of Concept Study

In September of 2014, we initiated our Phase 2b of concept study, entitled “Cenicriviroc Efficacy and Safety Study in Adult Subjects with Nonalcoholic Steatohepatitis and Liver Fibrosis”, which we refer to as CENTAUR. This trial is a randomized, double-blind study of CVC versus placebo in patients with NASH and liver fibrosis, including those with type-2 diabetes and/or one or more components of metabolic syndrome. The study is being conducted in North America, Europe and Australia, and is led by Dr. Scott Friedman as Study Chairman. The study is targeting to enroll approximately 250 patients in this two-arm clinical trial randomized 1:1 for once-daily treatment with CVC or placebo for a first period of one year. Following the primary endpoint at one year, patients on CVC will continue on CVC and patients on placebo will either start receiving CVC or continue on placebo for a second year (1:1). The primary analysis will be conducted at one year and endpoints will include a two point improvement in NAS score without worsening of fibrosis as assessed by liver biopsy, resolution of NASH, collagen morphometry, validated fibrosis scores, noninvasive imaging and biomarkers. Endpoints will be measured again at two years. We expect to reach our primary endpoint in the second quarter of 2016. In September 2013, the AASLD and the FDA conducted a joint workshop focused on trial designs and endpoints in drug and diagnostics development for liver disease secondary to NAFLD, including NASH. We believe the CENTAUR study design incorporates surrogate endpoints that may form the basis for demonstrating efficacy required for approval based on feedback from experts involved in this workshop and feedback from the FDA in a June 2014 meeting. We expect additional FDA guidance to be available by the time we plan our registration studies.

In addition to the CENTAUR study, we are initiating additional studies to evaluate CVC in the treatment of NASH. In the first quarter of 2015, we plan to initiate a Phase 1 PK and safety study in healthy subjects in

combination with pioglitazone from which we expect to have data in 2015. We are also planning additional preclinical studies that will evaluate CVC in combination with additional experimental agents. In the first half of 2015 we plan to initiate a Phase 2a study to evaluate the effect of CCR2 and CCR5 antagonism by CVC on peripheral and adipose tissue insulin sensitivity in adult obese subjects with prediabetes and suspected non-alcoholic fatty liver disease (NAFLD). We expect to have preliminary results from this study in the second half of 2015.

HIV Disease Overview

HIV is a retrovirus that infects cells of the immune system such as T lymphocytes, specifically CD4+ T cells, dendritic cells and macrophages. Infection leads to a progressive weakening of the immune system and ultimately results in AIDS. The number of people living with HIV was estimated to be about 35.3 million worldwide in 2012. The number of people who died from AIDS-related illnesses worldwide in 2012 was approximately 1.6 million. In the United States, approximately 50,000 new cases of HIV are diagnosed every year.

Current Management and Unmet Need in HIV-1 Infection

The leading recommendations for HIV treatment were published by the World Health Organization in 2013. Generally recommended first line therapy is a combination of three or more anti-HIV drugs sometimes referred to as Highly Active Antiretroviral Therapy, or HAART.

The following image provides an overview of the current treatment paradigm for treatment-naïve HIV-1 infection, the most common strain of the HIV virus:

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Six different classes of anti-HIV drugs are currently available to HIV patients: nucleoside/nucleotide reverse transcriptase inhibitors, or NRTIs, non-nucleoside reverse transcriptase inhibitors, or NNRTIs, protease inhibitors, or PIs, entry inhibitors including a fusion inhibitor and a CCR5 antagonist, and integrase inhibitors.

HAART generally involves the use of two NRTIs as a backbone combined with a third agent; either a protease inhibitor, or PI, a boosted PI or an NNRTI; or an integrase inhibitor combined in a single tablet regimen, or STR. HAART has simplified the treatment of HIV and resulted in a dramatic improvement in virologic success leading to a decrease in the number of AIDS cases. Single-tablet regimens are critical for the effective management of HIV-1 as they are demonstrated to improve patient adherence and viral control. Datamonitor forecasted United States sales of HIV therapies to be $9.6 billion in 2014 and growing to $12.8 billion in 2020.

We believe there is a medical need for an alternative backbone for fixed-dose combinations, as tenofovir DF is the most common backbone component of HIV treatment and part of almost every preferred first-line treatment regimen in the AIDSinfo treatment guidelines. Although HIV patients who tolerate HAART are living longer, HAART is not curative and therefore life-long treatment is required. Furthermore, despite recently approved potent and well-tolerated classes of third agent drugs, including integrase inhibitors, patients with HIV face chronic toxicity and are developing and dying from “age-related diseases” a decade younger than their

uninfected counterparts. Some age-related diseases observed with increasing frequency in HIV patients despite viral suppression on HAART include cardiovascular, cerebrovascular, renal, immunologic, neurologic and bone diseases. A 10-year Veterans Health Administration study, or the VA study, of over 10,000 HIV patients showed that patients taking tenofovir DF, a component of the tenofovir disoproxil fumarate/emtricitabine, or TDF/FTC, backbone used in most treatment-naïve patients as part of a STR, are at increased risk for clinically significant irreversible kidney toxicity. Even after accounting for demographics, HIV-related factors, comorbidities and other antiretroviral drugs, the VA study found that tenofovir DF remained independently associated with an elevated risk of proteinuria, rapid decline in kidney function and development of chronic kidney disease.

Data continue to show that chronic immune activation and inflammation may play an important role in common comorbidities associated with HIV, including metabolic and cardiovascular complications, despite chronic viral suppression.

Mechanism of CVC in HIV-1

HIV infects cells of the immune system by binding to the CD4 receptor on the host cell, which is present on the surface of many lymphocytes. One of the main types of cells that HIV infects is the T-helper lymphocyte. These cells play a crucial role in the immune system, by coordinating the actions of other immune cells. Of all approved antiretrovirals for the treatment of HIV, CCR5 inhibitors are the only agents that target the host cells, providing a differentiated approach to existing HIV therapy.

CCR5 is the primary chemokine receptor responsible for entry of HIV-1 into host cells. CCR5 inhibition has been proven as an effective approach for targeting CCR5-tropic HIV-1 as demonstrated by maraviroc, the first approved chemokine receptor inhibitor. While it validates CCR5 as a target in HIV treatment, maraviroc’s twice-daily dosing rules out its use once-daily as part of a single-tablet regimen, the mainstay of first-line treatment demonstrated to positively impact both patient adherence and viral suppression. CVC is a potent once-daily inhibitor of CCR5 and CCR2 with a long half-life, and has shown potent anti-HIV activity and efficacy in clinical trials. In addition to its proven antiviral effects, we believe the anti-inflammatory and anti-fibrotic potential of CVC may help address the remaining common comorbidities observed in HIV patients. Furthermore, we have developed a formulation combining CVC with 3TC in a single tablet, providing a new potential backbone for treatment-naïve HIV-1 patients.

Clinical Data of CVC in HIV

The efficacy, pharmacokinetics, tolerability and safety of CVC in humans have been evaluated in approximately 580 subjects in 15 Phase 1 clinical trials and 2 Phase 2 clinical trials. This includes safety and tolerability data on 115 HIV-infected subjects treated up to 48 weeks.

Phase 2a 10-Day Monotherapy Study (Study 201)

Study 201 was a double-blind, randomized, placebo-controlled, dose-ranging Phase 2a study of CVC for 10 days in 54 subjects with CCR5-tropic HIV-1 infection, for which results were previously reported in the Journal of AIDS in 2011. Subjects were antiretroviral treatment-experienced, CCR5 antagonist-naïve, with HIV-1 RNA levels of at least 5000 copies/mL and CD4+ cell counts of at least 250 cells/mm³. The primary objectives of this study were to determine the antiviral activity, safety and tolerability of CVC monotherapy, and the secondary objectives were to determine PK, dose response and viral kinetics of CVC at 25, 50, 75, 100 and 150 mg dose levels versus placebo and between dose levels. Secondary objectives also included evaluating the initial drug-resistant viral mutations that might emerge following 10 days of CVC monotherapy. Exploratory assessment of changes in MCP-1, hs-CRP and IL-6 levels was conducted. The 100 mg dose utilized a different formulation of CVC that is no longer used so it was excluded from the efficacy endpoints. In the Phase 2a study, CVC showed a potent and durable effect in reducing HIV-1 RNA levels that persisted several days after patients stopped taking CVC. The median nadir changes from Baseline for the 25, 50, 75, and 150 mg doses were –0.7, –1.6, –1.8, and –1.7 log₁₀ copies/mL, respectively, as illustrated by the following chart:

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CVC showed potent antiviral activity that persisted well after completion of dosing. CVC was generally well tolerated at the doses studied and no safety concerns were identified. There were no serious adverse events (SAEs) or other significant AEs, and there were no discontinuations because of an AE. The PK/PD analysis showed that maximum plasma concentrations of CVC were achieved in three to four hours with all doses and steady state concentrations were achieved at eight days. Exploratory assessment of MCP-1, hs-CRP and IL-6 levels found significant dose-dependent increases in MCP-1. On day 10, least square mean MCP-1 levels obtained by flow cytometry were 56.3, 94.2, 34.4 and 334.3 pg per milliliter greater than at baseline in the 25, 50, 75 and 150-mg dose groups, respectively, compared with a slight decline in the placebo group. At the 50 and 150-mg doses, these results were statistically significant (p = 0.024 and p = 0.001, respectively). CVC had minimal effect on hs-CRP and in IL-6 levels at day 10 compared with baseline in any of the dose groups.

Phase 2b Double-Blind, Double-Dummy, 48-Week Study (Study 202)

Study 202 was a randomized, double-blind, double-dummy, 48-week Phase 2b study in antiretroviral treatment-naïve HIV-1 infected subjects with CCR5-tropic HIV-1 virus. The study evaluated the efficacy, safety, and tolerability of CVC 100 mg and CVC 200 mg compared to EFV; all administered orally in combination with emtricitabine and tenofovir disoproxil fumarate, or FTC/TDF. Administration of both doses of CVC and EFV was blinded using a double-blind, double-dummy design.

The following image provides an overview of the treatment design for Study 202:

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= randomized

A greater proportion of CVC-treated than EFV-treated subjects completed the study, 42 (71%), 41 (73%), and 17 (61%) for the CVC 100 mg, CVC 200 mg, and EFV treatment arms, respectively. The percent of subjects with virologic success, defined as HIV-1 RNA < 50 copies/mL using the intent-to-treat, or ITT, population, was comparable among the 3 treatment arms at Week 24, which was the primary efficacy endpoint: 76% with CVC 100 mg, 73% with CVC 200 mg, and 71% with EFV. Virologic success was higher in the CVC arms than in the EFV arm at Week 48 at 68% with CVC 100 mg, 64% with CVC 200 mg, and 50% with EFV.

At both Week 24 and Week 48, the percentage of subjects with virologic non-response was higher in the CVC arms than in the EFV arm (Week 24: 12% with CVC 100 mg, 14% with CVC 200 mg and 4% with EFV; Week 48: 15% with CVC 100 mg, 20% with CVC 200 mg and 11% with EFV), and the percentage of subjects without virologic data was higher in the EFV arm than in the CVC arms (Week 24: 12% with CVC 100 mg, 13% with CVC 200 mg and 25% with EFV; Week 48: 17% with CVC 100 mg, 16% with CVC 200 mg and 39% with EFV). A PK/PD analysis revealed a trend towards improved virologic outcomes with increasing CVC concentration.

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CVC showed a favorable safety profile with fewer treatment-related AEs, fewer AEs of at least Grade 3 in severity, and fewer AEs leading to discontinuations compared to EFV as shown in the following table.


Adverse event, n (%)	CVC 100 mg N=58	CVC 200 mg N=57	EFV 600 mg N=28
Subjects with at least one AE	51 (88%)	48 (84%)	27 (96%)
Grade 3	2 (3%)	3 (5%)	3 (11%)
Grade 4	0 (0%)	0 (0%)	1 (4%)
AEs leading to discontinuation	0 (0%)	1 (2%)	6 (21%)
Serious AEs	1 (2%)	1 (2%)	1 (4%)
Deaths	0 (0%)	0 (0%)	0 (0%)
Any Grade 2 or higher treatment-related AE (occurring in ³5%)
Abnormal dreams	1 (2%)	0 (0%)	3 (11%)
Insomnia	0 (0%)	0 (0%)	3 (11%)
Rash events	1 (2%)	0 (0%)	2 (7%)
Nausea	0 (0%)	2 (4%)	2 (7%)

Both doses of CVC were well tolerated and no apparent dose-relationship or dose-limiting toxicities were observed. No clinically relevant changes in electrocardiogram or vital parameters were observed during the 48-week treatment period.

Two patients in the CVC treatment arms experienced SAEs which were not considered drug-related by the investigators. One subject had an SAE of gastroenteritis of moderate severity that occurred one month after the last dose of CVC. Another subject had an SAE of infection of the cornea in one eye of severe intensity associated with ulceration and temporary blindness. The subjects continued to take CVC and completed the study.

CVC treatment was associated with a favorable lipid profile and led to sustained reductions in total and LDL cholesterol over 48 weeks, as shown in the following charts:

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Development Plan in HIV

In a subsequent end-of-Phase 2 meeting in September 2013, the FDA concurred that available efficacy and safety data support further evaluation of CVC and CVC/3TC in Phase 3 registration studies for the treatment of HIV-1 infected patients. We plan to submit an IND and advance clinical development of CVC/3TC in treatment-naïve HIV-1 infected patients in a single-tablet, fixed-dose combination. We believe this product candidate has the potential to provide a new backbone for multi-drug combination therapy for HIV. We are also planning a Phase 3 of CVC/3TC/EFV as a single tablet regimen. We plan to advance this Phase 3 program in collaboration with a strategic partner or with non-dilutive financing.

Phase 2b data from Study 202 evaluating CVC in combination with FTC/TDF support the evaluation of CVC/3TC in Phase 3 studies as part of a three-drug combination regimen. Both FTC and 3TC are cytosine analogues, are comparable in their structure, provide similar efficacy and safety and are recommended interchangeably in international treatment guidelines. Based on these similarities, we extrapolated that clinical data generated with CVC and FTC in Study 202 support the evaluation of CVC/3TC in Phase 3 studies. The FDA concurred with this determination at our end of Phase 2 meeting for CVC and CVC/3TC in September 2013.

In addition, a study in 39 healthy subjects, which we call Study 109, was conducted to evaluate the pharmacokinetics of CVC 200 mg and 400 mg and EFV 600 mg when co-administered. Study 109 demonstrated that CVC concentrations were decreased when EFV was co-administered, with a reduction of 23% for C_max, 48% for C_min, and 43% for AUC_0–t, and that increasing the dose of CVC was able to offset this interaction. CVC had no notable effects on EFV concentrations. All adverse events in Study 109 were mild to moderate and consistent with those of previous studies with CVC and EFV with dizziness and headache being the most commonly observed. This data, along with the supportive Phase 2b efficacy data from Study 202, support the evaluation a fixed dose combination product of CVC/3TC/EFV in Phase 3 studies. Prior to the start of Phase 3 studies, we intend to conduct additional Phase 1 studies, including bioavailability and drug-drug interaction studies for CVC/3TC and CVC/3TC/EFV fixed dose combination products.

Competition

The biopharmaceutical industry is characterized by intense competition and rapid innovation. Although we believe that we that we hold a leading position in the understanding of chemokine signaling inhibition in liver disease and HIV, our competitors may be able to develop other compounds or drugs that are able to achieve similar or better results. We face significant competition from large multinational pharmaceutical companies, established biotechnology companies and specialty pharmaceutical companies, which have materially greater financial, manufacturing, marketing, research and drug development resources than we do. Large pharmaceutical companies in particular have extensive expertise in preclinical and clinical testing and in obtaining regulatory approvals for drugs. Smaller or early-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large, established companies. In addition, academic institutions, government agencies and other public and private organizations conducting research may seek patent protection with respect to potentially competitive products or technologies. These organizations may also establish exclusive collaborative or licensing relationships with our competitors. We believe the key competitive factors that will affect the development and commercial success of our product candidates are efficacy, safety and tolerability profile, reliability, convenience of dosing, price and reimbursement.

We are aware of several companies with development programs targeting NASH in clinical trials including Intercept Pharmaceuticals, Inc., Gilead Sciences, Inc., Galectin Therapeutics Inc. Galmed Medical Research Ltd., Genfit Corp., Novartis AG, Novo Nordisk A/S, Takeda Pharmaceutical Company Limited, or Takeda, Raptor Pharmaceutical Corp., Immuron Ltd., Shire plc and Conatus Pharmaceuticals Inc. Many of the agents in development target metabolic mechanisms in NASH, such as peroxisome proliferator-activated receptors, or PPAR, agonists and farnesoid X, or FXR, receptor agonists. Other agents in development target fibrosis, such as targeting the collagen cross-linking enzyme lysyl oxidase-like 2, or LOXL2. We are aware of two studies

evaluating investigational agents for NASH that have met their primary endpoints in Phase 2b clinical trials, the FLINT study of obeticholic acid vs. placebo and the PIVENS study of Vitamin E or pioglitazone vs. placebo. Results of the FLINT study were published in The Lancet in November of 2014 and results of the PIVENS study were published in The New England Journal of Medicine in April of 2010. We are not aware of a competitor with an active development program for NASH targeting CCR2/CCR5 inhibition.

Major, currently marketed HIV therapies include single tablet regimens Atripla, Complera, Stribild and Triumeq (Bristol-Myers Squibb Company, Gilead Sciences Inc., Janssen Pharmaceuticals Inc. and ViiV Healthcare), NRTI backbones Truvada and Epzicom (Gilead Sciences Inc. and ViiV Healthcare) and multiple single agent products in the integrase inhibitor, protease inhibitor and NNRTI class. Other companies are developing novel HIV therapies and vaccines.

Manufacturing

We do not own or operate manufacturing facilities for the production of any of our product candidates, nor do we have plans to develop our own manufacturing operations in the foreseeable future. We currently rely on third-party contract manufacturers, or CMO, for all our required raw materials, drug substance and drug product needs for preclinical research and clinical trials. We do not have long-term agreements with any of these third parties. We also do not have any current contractual relationships for the manufacture of commercial supplies of any of our product candidates if they are approved. If any of our products are approved by any regulatory agency, we intend to enter into agreements with a third-party contract manufacturer and one or more back-up manufacturers for the commercial production of those products. Development and commercial quantities of any products that we develop will need to be manufactured in facilities, and by processes, that comply with the requirements of the FDA and the regulatory agencies of other jurisdictions in which we are seeking approval.

Takeda License

In August 2007, we entered into an exclusive license agreement with Takeda relating to CVC (then known as TAK-652) and TAK-220. Under the agreement, Takeda assigned to us certain patents relating to CVC and TAK-220. Takeda also agreed not to enforce certain ancillary patents relating to CVC and TAK-220 against us and granted us an exclusive license under know-how and other information relating to CVC and TAK-220, in each case on a worldwide basis to manufacture, develop and commercialize both product candidates globally. The agreement was amended in November 2009 to update the lists of assigned patents and ancillary patents.

Under the agreement, we agreed to use commercially reasonable efforts to develop CVC for the treatment of HIV infection and, if we choose to develop CVC for any other indication or choose to develop TAK-220, we must use commercially reasonable efforts with respect to such development activities. We must also use commercially reasonable efforts to obtain regulatory approval for licensed products we develop in the U.S. and Europe, and in any other countries we deem appropriate. In addition, we must achieve first commercial sale of a licensed product within a specified period of time after receipt of regulatory approval therefor, subject to certain exceptions. Finally, we must use commercially reasonable efforts to maintain, apply for patent term extensions with respect to, and take action against infringement of the patents assigned to us under the agreement. During the term of the agreement, we may not develop or commercialize any CCR5 antagonist products, other than CVC and TAK-220, for any indications for which we are developing or commercializing CVC and TAK-220.

Under the agreement, we paid to Takeda an upfront license fee of $3.0 million and are obligated to pay to Takeda up to $102.0 million in the aggregate in development and sales milestones. We are also obligated to pay to Takeda tiered royalties based on aggregate annual net sales of all licensed products from the high single digit to the low double digit percentage of net sales, subject to certain reductions and exceptions. Our obligation to pay royalties to Takeda expires on a country-by-country basis on the later of either expiration of the last to expire patent assigned to us under the agreement, or the earlier of the twelfth anniversary of the first commercial sale of the product or one or more generic versions of the product achieving a certain market share in such country.

Our agreement with Takeda continues in effect on a country-by-country and licensed product-by-licensed product basis until the expiration of our obligation to pay royalties to Takeda in such country with respect to such licensed product. Either we or Takeda may terminate the agreement for the other party’s material breach of the agreement, except that Takeda may terminate the agreement only with respect to the applicable licensed product if we materially breach our non-compete obligations. We may terminate the agreement under certain circumstances if we determine that further development or sale of licensed products is not feasible. If we terminate the agreement under such circumstances or Takeda terminates the entire agreement for our material breach, we would lose our right to use the know-how and other information relating to CVC and TAK-220 that was licensed to us by Takeda and, upon Takeda’s request, we must assign back to Takeda or abandon the patents assigned to us under the agreement and transfer to Takeda other materials and intellectual property that we developed during the term of the agreement.

Intellectual Property

The proprietary nature of, and protection for, our product candidates and our discovery programs, processes and know-how are important to our business. We have sought patent protection in the United States and internationally for CVC and related product candidates, and any other inventions to which we have rights, where available and when appropriate. Our policy is to pursue, maintain and defend patent rights in strategic areas, whether developed internally or licensed from third parties, and to protect the technology, inventions and improvements that are commercially important to the development of our business. We also rely on trade secrets that may be important to the development of our business.

Our commercial success will depend in part on obtaining and maintaining patent protection and trade secret protection of our current and future product candidates and the methods used to develop and manufacture them, as well as successfully defending these patents against third-party challenges. Our ability to stop third parties from making, using, selling, offering to sell or importing our products depends on the extent to which we have rights under valid and enforceable patents or trade secrets that cover these activities. We cannot be sure that patents will be granted with respect to any of our pending patent applications or with respect to any patent applications filed by us in the future, nor can we be sure that any of our existing patents or any patents that may be granted to us in the future will be commercially useful in protecting our product candidates, discovery programs and processes. For this and more comprehensive risks related to our intellectual property, please see “Risk Factors—Risks Relating to Our Intellectual Property.”

We own exclusively several patents covering CVC which we obtained from Takeda, and have also licensed intellectual property relating to CVC from Takeda. Patents owned by or licensed to us covering CVC composition of matter are expected to expire in the United States in 2022, before any potential patent term extensions or exclusivity protection or adjustments for patent office delays, and in 2023 when such adjustments for patent office delays are considered. We own or have rights to additional patents and pending patent applications that cover formulations, combination products, and use of CVC to treat various indications with expected patent expiration dates in the United States that range from 2022 (for issued patents) to potentially 2035 (for currently-filed provisional patent applications if patents were to issue on non-provisional applications filed thereon).

Our patent portfolio for CVC contains patents directed to the composition of matter of CVC. As of September 30, 2014, we owned one issued U.S. patent and several corresponding foreign patents directed specifically to the composition of matter of CVC. Foreign patents for the composition of matter of CVC have been granted in Canada, Japan and the European Union (with corresponding validations in 18 European countries: Austria, Belgium, Switzerland, Czech Republic, Germany, Denmark, Spain, Finland, France, United Kingdom, Greece, Ireland, Italy, Netherlands, Portugal, Sweden, Slovak Republic and Turkey). We expect that the composition of matter CVC patent, if the appropriate maintenance, renewal, annuity or other governmental fees are paid, will expire in 2023 (U.S.) when adjustments for patent office delays are considered, and 2022 (international). It is possible that the term of a composition of matter patent in the United States could be

extended up to five additional years under the provisions of the Hatch-Waxman Act. Patent term extension may also be available in certain foreign countries upon regulatory approval.

Our patent portfolio also includes patents directed to CVC compound classes, pharmaceutical compositions, combination products, methods of synthesis and methods of use of CVC to treat HIV and certain inflammation, autoimmune and other indications. As of September 30, 2014, we owned three issued U.S. patents and several corresponding foreign patents directed to such subject matter. Foreign patents have been granted in Canada, Japan and the European Union (where the EP patent directed to CVC compound classes, their pharmaceutical compositions, use of CVC compound classes for treating HIV, and method of making CVC compound classes has validations in 4 European countries: Germany, France, United Kingdom, and Ireland; and the EP patent directed to use of CVC for treating inflammation, autoimmune and other diseases, combo therapy of CVC, and process of making CVC has validations in 18 European countries: Austria, Belgium, Switzerland, Czech Republic, Germany, Denmark, Spain, Finland, France, United Kingdom, Greece, Ireland, Italy, Netherlands, Portugal, Sweden, Slovak Republic and Turkey). We also own pending applications in the United States and Japan directed to such subject matter. We expect that the CVC compound class, pharmaceutical compositions, methods of synthesis, and methods of use patents, if the appropriate maintenance, renewal, annuity or other governmental fees are paid, will expire in 2023 (U.S.) and 2022 (international), and that the CVC combination products patents will expire in 2022 (United States and international). In addition, our patent portfolio includes pending applications directed to CVC product formulations, combination products, and other therapeutic use of CVC. These patent applications, if issued as patents, will have potential patent expiration dates ranging from 2034 to 2035. Below is a summary of our patents and patent applications and the projected patent terms and, if applicable, extension dates.

LOGO

Projected term if patents are issued

Projected extension date. Europe may vary by country

Government Regulation and Product Approval

Governmental authorities in the United States, at the federal, state and local level, and analogous authorities in other countries extensively regulate, among other things, the research, development, testing, manufacture, labeling, packaging, promotion, storage, advertising, distribution, marketing and export and import of products such as those we are developing. Our product candidates must be approved by the FDA through the new drug application, or NDA, process before they may be legally marketed in the United States and by the European Medicines Agency, or EMA, through the marketing authorization application, or MAA, process before they may be legally marketed in Europe. Our product candidates will be subject to similar requirements in other countries

prior to marketing in those countries. The process of obtaining regulatory approvals and the subsequent compliance with applicable federal, state, local and foreign statutes and regulations require the expenditure of substantial time and financial resources.

United States Government Regulation

NDA Approval Processes

In the United States, the FDA regulates drugs under the Federal Food, Drug, and Cosmetic Act, or the FDCA, and the FDA’s implementing regulations. An applicant seeking approval to market and distribute a new drug product in the United States must typically undertake the following:

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completion of preclinical laboratory tests, animal studies and formulation studies in compliance with the FDA’s good laboratory practice, or GLP, regulations;

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submission to the FDA of an investigational new drug, or IND, application which must take effect before human clinical trials may begin;

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approval by an independent institutional review board, or IRB, representing each clinical site before each clinical trial may be initiated;

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performance of adequate and well-controlled human clinical trials in accordance with good clinical practice, or GCP, regulations to establish the safety and efficacy of the proposed drug product for each indication;

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preparation and submission to the FDA of an NDA;

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review of the product by an FDA advisory committee, where appropriate or if applicable;

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satisfactory completion of one or more FDA inspections of the manufacturing facility or facilities at which the product or its components are produced to assess compliance with current good manufacturing practices, or GMP, regulations and to assure that the facilities, methods and controls are adequate to preserve the product’s identity, strength, quality and purity;

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payment of user fees and securing FDA approval of the NDA; and

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compliance with any post-approval requirements, including potential requirements for a risk evaluation and mitigation strategies, or REMS, and post-approval outcomes studies required by the FDA.

Once a pharmaceutical candidate is identified for development, it enters the preclinical or nonclinical testing stage. Nonclinical tests include laboratory evaluations of product chemistry, toxicity and formulation, as well as animal studies. An IND application sponsor must submit the results of the nonclinical tests, together with manufacturing information and analytical data, to the FDA as part of the IND. Some nonclinical testing may continue even after the IND is submitted. In addition to including the results of the nonclinical studies, the IND will also include a protocol detailing, among other things, the objectives of the clinical trial, the parameters to be used in monitoring safety and the effectiveness criteria to be evaluated if the first phase lends itself to an efficacy determination. The IND automatically becomes effective 30 days after receipt by the FDA, unless the FDA, within the 30-day time period, places the IND on clinical hold. In such a case, the IND sponsor and the FDA must resolve any outstanding concerns before clinical trials can begin. A clinical hold may occur at any time during the life of an IND, and may affect one or more specific studies or all studies conducted under the IND.

All clinical trials must be conducted under the supervision of one or more qualified investigators in accordance with GCP regulations. They must be conducted under protocols detailing the objectives of the trial, dosing procedures, research subject selection and exclusion criteria and the safety and effectiveness criteria to be evaluated. Each protocol must be submitted to the FDA as part of the IND, and progress reports detailing the status of the clinical trials must be submitted to the FDA annually. Sponsors also must timely report to FDA serious and unexpected adverse reactions, any clinically important increase in the rate of a serious suspected

adverse reaction over that listed in the protocol or investigation brochure, or any findings from other studies or animal or in vitro testing that suggest a significant risk in humans exposed to the drug. An IRB at each institution participating in the clinical trial must review and approve the protocol before a clinical trial commences at that institution and must also approve the information regarding the trial and the consent form that must be provided to each research subject or the subject’s legal representative, monitor the study until completed and otherwise comply with IRB regulations.

Human clinical trials are typically conducted in three sequential phases that may overlap or be combined:

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Phase 1. The drug is initially introduced into healthy human subjects and tested for safety, dosage tolerance, absorption, metabolism, distribution and elimination. In the case of some products for severe or life-threatening diseases, such as cancer, and especially when the product may be inherently too toxic to ethically administer to healthy volunteers, the initial human testing is often conducted in patients who already have the condition.

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Phase 2. Clinical trials are performed on a limited patient population intended to identify possible adverse effects and safety risks, to preliminarily evaluate the efficacy of the product for specific targeted diseases and to determine dosage tolerance and optimal dosage.

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Phase 3. Clinical trials are undertaken to further evaluate dosage, clinical efficacy and safety in an expanded patient population at geographically dispersed clinical study sites. These studies are intended to establish the overall risk-benefit ratio of the product and provide an adequate basis for product approval and labeling claims. The FDA generally requires two adequate and well controlled Phase 3 clinical trials, but in some cases may accept a single large trial with confirmatory evidence.

Human clinical trials are inherently uncertain and Phase 1, Phase 2 and Phase 3 testing may not be successfully completed. The FDA or the sponsor may suspend a clinical trial at any time for a variety of reasons, including a finding that the research subjects or patients are being exposed to an unacceptable health risk. Similarly, an IRB can suspend or terminate approval of a clinical trial at its institution if the clinical trial is not being conducted in accordance with the IRB’s requirements or if the drug has been associated with unexpected serious harm to patients. In some cases, clinical trials are overseen by an independent group of qualified experts organized by the trial sponsor, which is called the clinical monitoring board or data safety monitoring board. This group provides authorization for whether or not a trial may move forward at designated check points. These decisions are based on the limited access to data from the ongoing trial.

During the development of a new drug, sponsors are given opportunities to meet with the FDA at certain points. These points may be prior to the submission of an IND, at the end of Phase 2 and before an NDA is submitted. Meetings at other times may be requested. These meetings can provide an opportunity for the sponsor to share information about the data gathered to date and for the FDA to provide advice on the next phase of development.

Concurrent with clinical trials, sponsors usually complete additional animal safety studies and also develop additional information about the chemistry and physical characteristics of the drug and finalize a process for manufacturing commercial quantities of the product in accordance with GMP requirements. The manufacturing process must be capable of consistently producing quality batches of the drug and the manufacturer must develop methods for testing the quality, purity and potency of the drug. Additionally, appropriate packaging must be selected and tested and stability studies must be conducted to demonstrate that the drug candidate does not undergo unacceptable deterioration over its proposed shelf-life.

The results of product development, nonclinical studies and clinical trials, along with descriptions of the manufacturing process, analytical tests and other control mechanisms, proposed labeling and other relevant information are submitted to the FDA as part of an NDA requesting approval to market the product. The

submission of an NDA is subject to the payment of user fees, but a waiver of such fees may be obtained under specified limited circumstances. The FDA reviews all NDAs submitted to ensure that they are sufficiently complete for substantive review before it accepts them for filing. It may request additional information rather than accept an NDA for filing. In this event, the NDA must be resubmitted with the additional information. The resubmitted application also is subject to review before the FDA accepts it for filing.

Once the submission is accepted for filing, the FDA begins an in-depth review. NDAs receive either standard or priority review. A drug representing a significant improvement in treatment, prevention or diagnosis of disease may receive priority review. The FDA may refuse to approve an NDA if the applicable regulatory criteria are not satisfied or may require additional clinical or other data. Even if such data are submitted, the FDA may ultimately decide that the NDA does not satisfy the criteria for approval. The FDA reviews an NDA to determine, among other things, whether a product is safe and effective for its intended use and whether its manufacturing is GMP-compliant. The FDA may refer the NDA to an advisory committee for review and recommendation as to whether the application should be approved and under what conditions. The FDA is not bound by the recommendation of an advisory committee, but it generally follows such recommendations. Before approving an NDA, the FDA will inspect the facility or facilities where the product is manufactured and tested. After the FDA evaluates the NDA and the manufacturing facilities, it issues either an approval letter or a complete response letter. A complete response letter generally outlines the deficiencies in the submission and may require substantial additional testing or information in order for the FDA to reconsider its application. If, or when, those deficiencies have been addressed to the FDA’s satisfaction, in a resubmission of the NDA, the FDA will issue an approval letter.

Fast Track, Breakthrough Therapy, Priority Review and Accelerated Approval

The FDA is authorized to designate certain products for expedited review if they are intended to address an unmet medical need in the treatment of a serious or life-threatening disease or condition. These programs are fast track designation, breakthrough therapy designation and priority review designation.

Specifically, the FDA may designate a product for fast track review if it is intended, whether alone or in combination with one or more other drugs, for the treatment of a serious or life-threatening disease or condition, and it demonstrates the potential to address unmet medical needs for such a disease or condition. For fast track products, sponsors may have greater interactions with the FDA and the FDA may initiate review of sections of a fast track product’s NDA before the application is complete.

A product may also be designated as a breakthrough therapy if it is intended, either alone or in combination with one or more other drugs, to treat a serious or life-threatening disease or condition and preliminary clinical evidence indicates that the product may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints, such as substantial treatment effects observed early in clinical development. The FDA may take certain actions with respect to breakthrough therapies, including holding meetings with the sponsor throughout the development process; providing timely advice to the product sponsor regarding development and approval; involving more senior staff in the review process; assigning a cross-disciplinary project lead for the review team; and taking other steps to design the clinical trials in an efficient manner.

The FDA may also designate an NDA for priority review if it is for a drug that treats a serious condition and, if approved, would provide a significant improvement in safety or effectiveness. The FDA determines, on a case-by-case basis, whether the proposed drug represents a significant improvement when compared with other available therapies. A priority designation is intended to direct overall attention and resources to the evaluation of such applications, and to shorten the FDA’s goal for taking action on the NDA from 12 months to eight months.

Finally, the FDA may grant accelerated approval to a drug for a serious or life-threatening condition that provides meaningful therapeutic advantage to patients over existing treatments based upon a determination that the drug has an effect on a surrogate endpoint that is reasonably likely to predict clinical benefit. The FDA may

also grant accelerated approval for such a condition when the product has an effect on an intermediate clinical endpoint that can be measured earlier than an effect on irreversible morbidity or mortality, or IMM, and that is reasonably likely to predict an effect on IMM or another clinical benefit, taking into account the severity, rarity, or prevalence of the condition and the availability or lack of alternative treatments. Drugs granted accelerated approval must meet the same statutory standards for safety and effectiveness as those granted traditional approval. Accelerated approval is generally contingent on a sponsor’s agreement to conduct additional post-approval studies to verify and describe the drug’s clinical benefit.

Post-approval Requirements

Drugs manufactured or distributed pursuant to FDA approvals are subject to pervasive and continuing regulation by the FDA, including, among other things, requirements relating to recordkeeping, periodic reporting, product sampling and distribution, advertising and promotion and reporting of adverse experiences with the product. Once an approval is granted, the FDA may withdraw the approval if compliance with regulatory requirements is not maintained or if problems occur after the product reaches the market. Later discovery of previously unknown problems with a product may result in restrictions on the product or even complete withdrawal of the product from the market. After approval, some types of changes to the approved product, such as adding new indications, manufacturing changes and additional labeling claims, are subject to further FDA review and approval. In addition, the FDA may require testing and surveillance programs to monitor the effect of approved products that have been commercialized, and the FDA has the power to prevent or limit further marketing of a product based on the results of these post-marketing programs.

Drug manufacturers and other entities involved in the manufacture and distribution of approved drugs are required to register their establishments with the FDA and certain state agencies, and are subject to periodic unannounced inspections by the FDA and some state agencies for compliance with GMP regulations and other laws. Changes to the manufacturing process are strictly regulated and often require prior FDA approval before being implemented. FDA regulations also require investigation and correction of any deviations from GMP requirements and impose reporting and documentation requirements upon the sponsor and any third-party manufacturers that the sponsor may decide to use. Accordingly, manufacturers must continue to expend time, money, and effort in the area of production and quality control to maintain GMP compliance.

Failure to comply with the applicable U.S. requirements at any time during the product development process or approval process, or after approval, may subject us to administrative or judicial sanctions, any of which could have a material adverse effect on us. These sanctions could include:

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warning or untitled letters;

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refusal to approve pending applications;

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withdrawal of an approval;

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imposition of a clinical hold;

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product seizures;

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total or partial suspension of production or distribution; or

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injunctions, fines, disgorgement, or civil or criminal penalties.

The FDA strictly regulates the marketing, labeling, advertising and promotion of drug products that are placed on the market. Drugs may be promoted only for the approved indications and in accordance with the provisions of the approved label. The FDA and other agencies actively enforce the laws and regulations prohibiting the promotion of off-label uses, and a company that is found to have improperly promoted off-label uses may be subject to significant liability.

From time to time, legislation is drafted, introduced and passed in Congress that could significantly change the statutory provisions governing the approval, manufacturing and marketing of products regulated by the FDA. In addition, FDA regulations and guidance are often issued revised or reinterpreted by the agency. It is impossible to predict whether legislative changes will be enacted, or whether FDA regulations, guidance or interpretations will be issued or changed or what the impact of such changes, if any, may be.

Regulation Outside of the United States

In addition to regulations in the United States, we will be subject to regulations of other countries governing clinical trials and commercial sales and distribution of our products. Whether or not we obtain FDA approval for a product, we must obtain approval by the comparable regulatory authorities of countries outside of the United States before we can commence clinical trials in such countries and approval of the regulators of such countries or economic areas, such as the European Union, before we may market products in those countries or areas. The approval process and requirements governing the conduct of clinical trials, product licensing, pricing and reimbursement vary greatly from place to place, and the time may be longer or shorter than that required for FDA approval.

Under EU regulatory systems, a company may submit an MAA either under a centralized or decentralized procedure. The centralized procedure, which is compulsory for medicines produced by biotechnology or those medicines intended to treat AIDS, cancer, neurodegenerative disorders or diabetes and optional for those medicines which are highly innovative, provides for the grant of a single marketing authorization that is valid for all EU member states. The decentralized procedure provides for mutual recognition of national approval decisions. Under this procedure, the holder of a national marketing authorization may submit an application to the remaining member states. Within 90 days of receiving the applications and assessments report, each member state must decide whether to recognize approval. If a member state does not recognize the marketing authorization, the disputed points are eventually referred to the European Commission, whose decision is binding on all member states.

Other Healthcare Laws

Although we currently do not have any products on the market, if our drug candidates are approved and we begin commercialization, we may be subject to additional healthcare regulation and enforcement by the federal government and by authorities in the states and foreign jurisdictions in which we conduct our business. Such laws include, without limitation, state and federal anti-kickback, fraud and abuse, false claims, privacy and security, price reporting and physician sunshine laws and regulations.

The federal Anti-Kickback Statute makes it illegal for any person, including a prescription drug manufacturer (or a party acting on its behalf) to knowingly and willfully solicit, receive, offer, or pay any remuneration that is intended to induce the referral of business, including the purchase, order, or prescription of a particular drug, for which payment may be made under a federal healthcare program, such as Medicare or Medicaid. Violations of this law are punishable by up to five years in prison, and can also result in criminal fines, administrative civil money penalties and exclusion from participation in federal healthcare programs. In addition, many states have adopted laws similar to the Anti-Kickback Statute. Some of these state prohibitions apply to the referral of patients for healthcare services reimbursed by any insurer, not just federal healthcare programs such as Medicare and Medicaid. Due to the breadth of these federal and state anti-kickback laws, the absence of guidance in the form of regulations or court decisions, and the potential for additional legal or regulatory change in this area, it is possible that our future sales and marketing practices and/or our future relationships with physicians might be challenged under these laws, which could harm us.

Another significant statute that may apply to us in the future is the federal False Claims Act. The federal False Claims Act prohibits anyone from knowingly presenting, or causing to be presented, for payment to federal programs (including Medicare and Medicaid) claims for items or services, including drugs, that are false or

fraudulent, claims for items or services not provided as claimed, or claims for medically unnecessary items or services. Manufacturers can be held liable under these laws if they are deemed to ‘‘cause’’ the submission of false or fraudulent claims by, for example, providing inaccurate billing or coding information to customers or promoting a product off-label. In addition, our future activities relating to the reporting of wholesaler or estimated retail prices for our products, the reporting of prices used to calculate Medicaid rebate information and other information affecting federal, state and third-party reimbursement for our products, and the sale and marketing of our products, are subject to scrutiny under this law. Penalties for False Claims Act violations include three times the actual damages sustained by the government, plus mandatory civil penalties of between $5,500 and $11,000 for each separate false claim, the potential for exclusion from participation in federal healthcare programs, and, although the federal False Claims Act is a civil statute, False Claims Act violations may also implicate various federal criminal statutes. If the government were to allege that we were, or convict us of, violating these false claims laws, we could be subject to a substantial fine and may suffer a decline in our stock price. In addition, private individuals have the ability to bring actions under the federal False Claims Act, and certain states have enacted laws modeled after the federal False Claims Act.

Because we intend to commercialize products that could be reimbursed under a federal healthcare program and other governmental healthcare programs, we will have to develop a comprehensive compliance program that establishes internal controls to facilitate adherence to the rules and program requirements to which we will or may become subject. Although compliance programs can mitigate the risk of investigation and prosecution for violations of these laws, the risks cannot be entirely eliminated. If our operations are found to be in violation of any of such laws or any other governmental regulations that apply to us, we may be subject to penalties, including, without limitation, civil and criminal penalties, damages, fines, the curtailment or restructuring of our operations, exclusion from participation in federal and state healthcare programs and imprisonment, any of which could adversely affect our ability to operate our business and our financial results.

More generally, The Patient Protection and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act, or collectively, the Affordable Care Act, is expected to have a significant impact on the healthcare industry. The Affordable Care Act is expected to expand coverage for the uninsured while at the same time containing overall healthcare costs. With regard to pharmaceutical products, among other things, the Affordable Care Act expanded and increased industry rebates for drugs covered under Medicaid programs and made changes to the coverage requirements under the Medicare prescription drug benefit. We cannot predict the impact of the Affordable Care Act on pharmaceutical companies, as many of the reforms require the promulgation of detailed regulations implementing the statutory provisions, some of which has not yet occurred. In the coming years, additional legislative and regulatory changes could be made to governmental health programs that could significantly impact pharmaceutical companies and the success of our product candidates.

Coverage and Reimbursement

Sales of our products will depend, in part, on the extent to which the costs of our products will be covered by third-party payors, such as government health programs, commercial insurance and managed healthcare organizations. These third-party payors are increasingly challenging the prices charged for medical products and services. Additionally, the containment of healthcare costs has become a priority of federal and state governments and the prices of drugs have been a focus in this effort. The U.S. government, state legislatures and foreign governments have shown significant interest in implementing cost-containment programs, including price controls, restrictions on reimbursement and requirements for substitution of generic products. Adoption of price controls and cost-containment measures, and adoption of more restrictive policies in jurisdictions with existing controls and measures, could limit our net revenue and results. If these third-party payors do not consider our products to be cost-effective compared to other therapies, they may not cover our products after approved as a benefit under their plans or, if they do, the level of payment may not be sufficient to allow us to sell our products on a profitable basis. Decreases in third-party reimbursement for our products once approved or a decision by a third-party payor to not cover our products could reduce or eliminate utilization of our products and have a material adverse effect on our sales, results of operations and financial condition. In addition, state and federal

healthcare reform measures have been and will be adopted in the future, any of which could limit the amounts that federal and state governments will pay for healthcare products and services, which could result in reduced demand for our products once approved or additional pricing pressures.

In addition, in some non-U.S. jurisdictions, the proposed pricing for a drug must be approved before it may be lawfully marketed. The requirements governing drug pricing vary widely from country to country. For example, the European Union provides options for its member states to restrict the range of medicinal products for which their national health insurance systems provide reimbursement and to control the prices of medicinal products for human use. A member state may approve a specific price for the medicinal product or it may instead adopt a system of direct or indirect controls on the profitability of the company placing the medicinal product on the market. There can be no assurance that any country that has price controls or reimbursement limitations for pharmaceutical products will allow favorable reimbursement and pricing arrangements for any of our products. Historically, reimbursement and pricing for products launched in the European Union do not follow those of the United States and generally tend to be significantly lower.

Employees

As of September 30, 2014, we employed 13 employees, all of whom are full-time and engaged in research and development activities, operations, finance, business development and administration. Four of our employees hold doctorate degrees (Ph.D., M.D. or PharmD.).

Property and facilities

We lease approximately 7,400 square feet of space for our current headquarters in South San Francisco, California under an agreement that expires in August 2019. We believe that our existing facilities are adequate to meet our current needs, and that suitable additional alternative spaces will be available in the future on commercially reasonable terms.

Legal proceedings

We are currently not a party to any material legal proceedings.

MANAGEMENT

Executive Officers and Directors

Our current executive officers, directors and key employees, and their ages and positions as of September 30, 2014, are as set forth below:


Name	Age		Position
Executive Officers
Laurent Fischer, M.D.		50	Chairman of the Board and Chief Executive Officer
Éric Lefebvre, M.D.		50	Chief Medical Officer
Christopher Peetz		36	Chief Financial Officer
Helen Jenkins		51	Chief Operating Officer

Directors
Carol L. Brosgart, M.D.		63	Director
Jeffrey H. Cooper		58	Director
Craig S. Gibbs		52	Director
Patrick Heron		44	Director
Gwen A. Melincoff		62	Director
Graeme J. Moyle, M.D.		51	Director
Eckard Weber, M.D.		64	Director

Laurent Fischer, M.D. has served as a member of our board of directors since April 2009 and as Chief Executive Officer since March 2014. Prior to joining Tobira full time he was Chairman and Chief Executive Officer of Jennerex, Inc. (now part of SillaJen, Inc.), a private, clinical-stage biotherapeutics company focused on oncolytic immunotherapy products for cancer, which he joined in 2012. Prior to Jennerex, Dr. Fischer was President and CEO of Ocera Therapeutics, Inc., a privately held, clinical-stage biopharmaceutical company focused on the development and commercialization of therapeutics for gastrointestinal and liver diseases, since 2005. Prior to Ocera, Dr. Fischer was President and CEO of life sciences company Auxeris Therapeutics, Inc. from 2003 to 2005 and President and COO of technology company RXCentric.com, Inc. (now part of Allscripts Healthcare Solutions, Inc.) from 1999 to 2000 and Chief Medical Officer and Vice President of Corporate Development of medication management company MedVantx from 2001 to 2003. Dr. Fischer served as Senior Vice President of the Global Virology Franchise at Dupont Pharmaceuticals/Dupont-Merck from 1997 to 1999. From 1995 to 1997, Dr. Fischer served as Medical Director for the Virology Group at healthcare company Hoffman-LaRoche, Ltd. Dr. Fischer received a Medical Degree from the University of Geneva and received a Doctorate in Medicine from the Geneva Medical School, Switzerland. Our board of directors believes that Dr. Fischer’s position as our Chief Executive Officer, his extensive experience in general management and his experience in the biopharmaceutical industry qualify him to serve as a member of our board of directors.

Éric Lefebvre, M.D. has served as our Chief Medical Officer since January 2012. Prior to joining Tobira, Dr. Lefebvre served as the Global Medical Affairs Leader from 2007 to 2011 and Global Clinical Research and Development Leader, Virology (HIV and HCV) from 2003 to 2007 at Janssen Pharmaceuticals (formerly Tibotec Pharmaceuticals, Ltd), a Johnson & Johnson Services, Inc. company. From 2001 until 2003, Dr. Lefebvre served as Medical Affairs Director, HIV, HSV and Vaccines at GlaxoSmithKline, Inc. Canada. Dr. Lefebvre’s career in the industry was preceded by 15 years of providing primary care and conducting clinical research in HIV and hepatitis at Clinique Médicale L’Actuel in Montréal, Canada. Dr. Lefebvre received an M.D. from the University of Montréal and received his undergraduate degree Health Sciences from Édouard-Montpetit College.

Christopher Peetz has served as our Chief Financial Officer and head of corporate development since March 2014. Prior to joining Tobira, Mr. Peetz was Vice President, Finance & Corporate Development at Jennerex, Inc. (now part of SillaJen, Inc.), which he joined in 2012. Prior to Jennerex, Mr. Peetz served in a variety of roles at biopharmaceutical company Onyx Pharmaceuticals, Inc. (now part of Amgen USA Inc.), most recently as Senior Director, Marketing from 2011 to 2012, as Senior Director, Corporate Development & Strategy from 2010 to

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2011, as Director, Strategic Planning from 2008 to 2010 and as Director, Finance from 2007 to 2008. Prior to Onyx Pharmaceuticals, Inc., Mr. Peetz provided merger and acquisition advisory services at LaSalle Corporate Finance, a part of ABN AMRO Bank N.V., and held positions at biopharmaceutical company Abgenix, Inc. (now part of Amgen USA Inc.) and biotechnology company Solazyme, Inc. Mr. Peetz received a B.S.B.A. from Washington University in St. Louis and received an M.B.A. from Stanford Graduate School of Business.

Helen Jenkins has served as our Chief Operating Officer since March 2014 and previously as our Senior Vice President, Development Operations, since August 2011. Prior to joining Tobira, Ms. Jenkins served from 2007 until 2011 as Executive Vice President, Chief Operating Officer and Chief Financial Officer at biopharmaceutical company Nuon Therapeutics, Inc. From 2000 until 2007 Ms. Jenkins served as Senior Vice President, Development Operations at biopharmaceutical company Saegis Pharmaceuticals, Inc. Previously, Ms. Jenkins held a variety of roles at biotechnology companies Genentech, Inc., Valentis, Inc. and Glycomed Incorporated. Ms. Jenkins received a B.S. in Biochemistry from California Polytechnic State University, San Luis Obispo and an M.A. in Cellular and Molecular Biology from San Francisco State University.

Carol L. Brosgart, M.D. has served as a member of our board of directors since September 2009. Dr. Brosgart served as Senior Advisor on Science and Policy to the Division of Viral Hepatitis at the CDC and to the Viral Hepatitis Action Coalition at the CDC Foundation from 2011 to 2013. Dr. Brosgart has also served as a member on the faculty of the School of Medicine at the University of California, San Francisco for the past three decades, where she is a Clinical Professor in the Division of Global Health and in Biostatistics and Epidemiology. From March 2011 until August 2011, Dr. Brosgart served as Chief Medical Officer at biotechnology company Alios BioPharma, Inc. Prior to Alios, Dr. Brosgart served as Senior Vice President and Chief Medical Officer of Children’s Hospital & Research Center in Oakland, California from 2009 until February 2011. Previously, she served for eleven years, from 1998 until 2009, at biopharmaceutical company Gilead Sciences, Inc., where she held a number of senior management roles, most recently as Vice President, Public Health and Policy and earlier as Vice President, Clinical Research and Vice President, Medical Affairs and Global Medical Director, Hepatitis. Prior to Gilead, Dr. Brosgart worked for more than 20 years in clinical care, research and teaching at several Bay Area medical centers. She was the founder and Medical Director of the East Bay AIDS Center at Alta Bates Medical Center in Berkeley, California from 1987 until 1998 and served as the Medical Director of Central Health Center, Oakland, California, of the Alameda County Health Care Services Agency. Dr. Brosgart has also served on the boards of privately held companies and public, not-for-profit organizations. Dr. Brosgart received a B.S. in Community Medicine from the University of California, Berkeley and received an M.D. from the University of California, San Francisco. Her residency training was in pediatrics, public health and preventive medicine at UCSF and UC Berkeley. Our board of directors believes that Dr. Brosgart’s extensive experience in general management and her experience in the biopharmaceutical industry qualify her to serve as a member of our board of directors.

Jeffrey H. Cooper has served as a member of our board of directors since June 2014. Mr. Cooper currently serves as an independent consultant. Prior to his role as an independent consultant, Mr. Cooper served from November 2013 until December 2013 as a senior advisor and from July 2012 until October 2013 as Chief Financial Officer of biotechnology company KaloBios Pharmaceuticals, Inc. Prior to joining KaloBios, Mr. Cooper served from 2003 to May 2012 in positions of increasing responsibility at BioMarin Pharmaceutical, Inc., a publicly traded pharmaceutical company beginning as Vice President, Controller, to his most recent position as Senior Vice President and Chief Financial Officer from 2007 to May 2012. Prior to BioMarin, from 1995 to 1997 and 1998 to 2002, he served as Vice President of Finance at Matrix Pharmaceuticals where he was responsible for the financial management of the company. Earlier in his career, Mr. Cooper held numerous finance-related positions within the health care and pharmaceutical industries, including Corporate Controller at Foundation Health Systems and Director of Business Analysis at Syntex Corporation, a company he worked for from 1983 to 1995. Mr. Cooper received a B.A. in Economics from the University of California, Los Angeles and an M.B.A. from Santa Clara University. Our board of directors believes that Mr. Cooper’s extensive experience in general management, finance and in the biotechnology industry qualify him to serve as a member of our board of directors.

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Craig S. Gibbs has served as a member of our board of directors since April 2014. Dr. Gibbs has served as an independent consultant since May 2013. From 1992 until 2013, Dr. Gibbs served in various positions at Gilead Sciences, Inc., including most recently as Vice President of Commercial Strategy/Planning and Operations from 2007 to 2013 and as Senior Director, Corporate Development from 2004 to 2007, Senior Director, Biology Research from 1998 to 2004 and in other research and development positions from 1992 to 1998. Prior to his time at Gilead, Dr. Gibbs served from 1989 to 1992 as Visiting Post-doctoral Scientist at Genentech, Inc. Dr. Gibbs received a B.Sc. in Biochemistry from Massey University, a Ph.D. in Molecular Biology from the University of Glasgow and an M.B.A. from Golden Gate University. Our board of directors believes that Dr. Gibbs’ extensive experience in general management and in the biotechnology industry qualify him to serve as a member of our board of directors.

Patrick Heron has served as a member of our board of directors since March 2007. Mr. Heron is a General Partner with Frazier Healthcare Ventures, a venture capital firm focusing on the healthcare industry, which he joined in 1999. Prior to joining Frazier Healthcare Ventures, Mr. Heron worked at the management consulting firm McKinsey & Company. Before McKinsey, Mr. Heron held positions with Massachusetts General Hospital and biotechnology firm Cetus Corporation. Mr. Heron currently serves on the boards of a number of privately held companies. Mr. Heron received a B.A. in Political Science from the University of North Carolina at Chapel Hill and received an M.B.A. from Harvard Business School. Our board of directors believes that Mr. Heron’s extensive business experience, his experience in venture capital, his experience in the life sciences sector and his service as a director of various private companies qualify him to serve as a member of our board of directors.

Gwen A. Melincoff has served as a member of our board of directors since June 2014. Since August 2014, Ms. Melincoff has served as Vice President, Business Development BTG International Inc., a healthcare company. From September 2004 to December 2013, Ms. Melincoff was Senior Vice President of Business Development at pharmaceutical company Shire Plc. Prior to joining Shire, Ms. Melincoff was Vice President of Business Development at Adolor Corporation (now part of Cubist Pharmaceuticals, Inc.), a biopharmaceutical company focused on the development of pain management products. Earlier in her career, Ms. Melincoff worked for Eastman Kodak Company for over ten years in a number of their health care companies. Ms. Melincoff received a B.S. in Biology from The George Washington University and an M.S. in Management and Health Care Administration from Pennsylvania State University. Our board of directors believes that Ms. Melincoff’s extensive experience in management and the pharmaceutical industry qualify her to serve as a member of our board of directors.

Graeme J. Moyle, M.D. has served as a member of our board of directors since June 2014. Dr. Moyle is Director of HIV Research Strategy and Associate Specialist in HIV/GU Medicine at the Chelsea and Westminster Hospital, London, where he has served since 1994. Prior to his time at Chelsea and Westminster Hospital, Dr. Moyle served as Medical Director, HIV at pharmaceutical company F. Hoffmann-La Roche Ltd. Dr. Moyle received an M.B.B.S. in Medicine and an M.D., both from the University of Adelaide. Our board of directors believes that Dr. Moyle’s extensive experience in medicine and management qualify him to serve as a member of our board of directors.

Eckard Weber, M.D. is a founder of Tobira and has served has served as a member of our board of directors since our inception in 2007. Dr. Weber has served as a partner with Domain Associates, LLC, a private venture capital management firm focused on life sciences, since 2001. Dr. Weber has over 20 years of drug discovery and development experience. Dr. Weber also served as interim Chief Executive Officer and Chairman of the Board of Sonexa Therapeutics, a seed-stage biopharmaceutical company from 2007 until June 2014. Dr. Weber also serves as chairman of the board at Ocera Therapeutics, Orexigen Therapeutics and Tragara Pharmaceuticals, and is a member of the board of directors of Adynxx, Domain Elite Holdings and Tobira Therapeutics. Dr. Weber has been the founding Chief Executive Officer of multiple Domain Associates portfolio companies including Acea Pharmaceuticals, Ascenta Therapeutics, Calixa Therapeutics, Cytovia and Novacardia. Dr. Weber also served as chairman or member of the board of directors of a number of companies until their sale including Peninsula Pharmaceuticals (sold to Johnson & Johnson in 2005), Cerexa (sold to Forest Laboratories in 2007) and Calixa Therapeutics (sold to Cubist Therapeutics, Inc. in 2009). Dr. Weber also served as a member of the board of

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directors of Conforma Therapeutics (sold to Biogen-IDEC in 2006) and Cabrellis Pharmaceuticals (sold to Pharmion in 2006). Until 1995, Dr. Weber was a tenured Professor of Pharmacology at the University of California, Irvine. Dr. Weber is the inventor or co-inventor of numerous patents and patent applications and has published more than 130 papers in scientific periodicals. Dr. Weber received his German undergraduate degree from Kolping Kolleg in Germany and an M.D. from the University of Ulm Medical School in Germany. Dr. Weber received his postdoctoral training in neuroscience at Stanford University Medical School. Our board of directors believes that Dr. Weber’s extensive experience in the life sciences industry as an entrepreneur, chief executive officer and venture capitalist, as well as his training as a physician, provide him with the qualifications and skills to serve as a director of our company.

Board Composition

Upon the completion of this offering, our board of directors will be divided into three classes with staggered three-year terms. At each annual meeting of stockholders, the successors to directors whose terms then expire will be elected to serve from the time of election and qualification until the third annual meeting following election. Our directors will be divided among the three classes as follows:

•

the Class I directors will be Dr. Brosgart, Mr. Gibbs and Dr. Moyle, and their terms will expire at the annual meeting of stockholders to be held in 2016;

•

the Class II directors will be Ms. Melincoff and Messrs. Cooper and Heron, and their terms will expire at the annual meeting of stockholders to be held in 2017; and

•

the Class III directors will be Messrs. Fischer and Weber, and their terms will expire at the annual meeting of stockholders to be held in 2018.

Directors in a particular class will be elected for three-year terms at the annual meeting of stockholders in the year in which their terms expire. As a result, only one class of directors will be elected at each annual meeting of our stockholders, with the other classes continuing for the remainder of their respective three-year terms. Each director’s term continues until the election and qualification of his or her successor, or the earlier of his or her death, resignation or removal.

Our restated certificate of incorporation and amended and restated bylaws that will be in effect upon the completion of this offering authorize only our board of directors to fill vacancies on our board of directors until the next annual meeting of stockholders. Any additional directorships resulting from an increase in the authorized number of directors would be distributed among the three classes so that, as nearly as possible, each class would consist of one-third of the authorized number of directors.

The classification of our board of directors may have the effect of delaying or preventing changes in our control or management. See “Description of Capital Stock—Anti-Takeover Provisions—Anti-takeover Effects of Delaware Law and Our Restated Certificate of Incorporation and Bylaws.”

Code of Business Conduct and Ethics

Our board of directors intends to adopt a code of ethics and business conduct to be effective upon the completion of this offering. The code of ethics and business conduct will apply to all of our employees, officers and directors. Upon the completion of this offering, the full text of our code of ethics and business conduct will be posted on our website. We intend to disclose, to the extent required by applicable rules and regulations, future amendments to, or waiver of, our code of ethics and business conduct, at the same location on our website identified above and also in public filings we will make with the Securities and Exchange Commission. Information contained on our website is not incorporated by reference into this prospectus, and you should not consider information contained on our website to be part of this prospectus or in deciding whether to purchase shares of our common stock.

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Director Independence

Our board of directors determined that all of our directors, other than Dr. Fischer, are “independent directors” as defined under the rules of The NASDAQ Stock Market. In making this determination, our board of directors reviewed and discussed information provided by the directors and us with regard to each director’s business and personal activities and relationships as they may relate to us and our management, including our consulting agreement with Dr. Brosgart.

Role of the Board in Risk Oversight

One of the key functions of our board of directors is informed oversight of our risk management process. In particular, our board of directors is responsible for monitoring and assessing strategic risk exposure. Our executive officers are responsible for the day-to-day management of the material risks we face. Our board of directors administers its oversight function directly as a whole, as well as through various standing committees of our board of directors that address risks inherent in their respective areas of oversight. For example, our audit committee is responsible for overseeing the management of risks associated with our financial reporting, accounting and auditing matters; our compensation committee oversees major risks associated with our compensation policies and programs; and our nominating and governance committee oversees the management of risks associated with director independence, conflicts of interest, composition and organization of our board of directors and director succession planning.

Board Committees

Our board of directors has established an audit committee, a compensation committee and a nominating and governance committee. Our board of directors and its committees set schedules for meeting throughout the year and can also hold special meetings and act by written consent from time to time, as appropriate. Our board of directors has delegated various responsibilities and authority to its committees as generally described below. The committees will regularly report on their activities and actions to the full board of directors. Each member of each committee of our board of directors qualifies as an independent director in accordance with NASDAQ listing standards. Each committee of our board of directors has a written charter approved by our board of directors. Upon the completion of this offering, copies of each charter will be posted on our website. The inclusion of our website address in this prospectus does not include or incorporate by reference the information on our website into this prospectus.

Audit Committee

Effective as of the completion of this offering, the members of our audit committee will be Messrs. Cooper and Gibbs and Dr. Moyle, each of whom can read and understand fundamental financial statements. Messrs. Cooper and Gibbs and Dr. Moyle are each independent under the rules and regulations of the Securities and Exchange Commission, or SEC, and the listing standards of The NASDAQ Global Market applicable to audit committee members. Mr. Cooper will chair the audit committee. Mr. Cooper qualifies as an audit committee financial expert within the meaning of SEC regulations and meets the financial sophistication requirements of The NASDAQ Stock Market.

The audit committee of our board of directors oversees our accounting practices, system of internal controls, audit processes and financial reporting processes. Among other things, our audit committee is responsible for reviewing our disclosure controls and processes and the adequacy and effectiveness of our internal controls. It also discusses the scope and results of the audit with our independent registered public accounting firm, reviews with our management and our independent registered public accounting firm our interim and year-end operating results and, as appropriate, initiates inquiries into aspects of our financial affairs. Our audit committee is responsible for establishing procedures for the receipt, retention and treatment of complaints regarding accounting, internal accounting controls or auditing matters, and for the confidential, anonymous submission by our employees of concerns regarding questionable accounting or auditing matters. In addition, our audit committee has sole and direct responsibility for the appointment, retention, compensation and oversight of the

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work of our independent registered public accounting firm, including approving services and fee arrangements. Significant related party transactions will be approved by our audit committee before we enter into them, as required by applicable rules and listing standards.

Compensation Committee

Effective as of the completion of this offering, the members of our compensation committee will be Ms. Melincoff and Messrs. Cooper and Heron. Mr. Heron will chair the compensation committee. Our board of directors has determined that each of Ms. Melincoff and Messrs. Cooper and Heron is independent under the applicable rules and regulations of The NASDAQ Stock Market, is a “non-employee director” as defined in Rule 16b-3 promulgated under the Exchange Act and is an “outside director” as that term is defined in Section 162(m) of the United States Internal Revenue Code of 1986, as amended, or Section 162(m). The purpose of our compensation committee is to discharge the responsibilities of our board of directors relating to executive compensation policies and programs. Among other things, specific responsibilities of our compensation committee include evaluating the performance of our chief executive officer and determining our chief executive officer’s compensation. The compensation committee also determines the compensation of our other executive officers in consultation with our chief executive officer. In addition, our compensation committee administers our stock-based compensation plans, including granting equity awards and approving modifications of such awards. Our compensation committee also reviews and approves various other compensation policies and matters.

Nominating and Governance Committee

Effective as of the completion of this offering, the members of our nominating and governance committee will be Dr. Brosgart and Messrs. Moyle and Weber. Mr. Weber will chair the nominating and governance committee. The nominating and governance committee oversees the nomination of directors, including, among other things, identifying, evaluating and making recommendations of nominees to our board of directors and evaluates the performance of our board of directors and individual directors. Our nominating and governance committee is also responsible for reviewing developments in corporate governance practices, evaluating the adequacy of our governance practices and making recommendations to our board of directors concerning corporate governance matters.

Compensation Committee Interlocks and Insider Participation

In the past three years, none of the members of our compensation committee is or has in the past served as an officer or employee of our company. None of our executive officers currently serves, or in the past year has served, as a member of a board of directors or compensation committee of any entity that has one or more executive officers serving on our board of directors or compensation committee.

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Director Compensation

The following table sets forth information about the compensation of the non-employee members of our board of directors who served as a director during our fiscal year ended December 31, 2013. Other than as set forth in the table and described more fully below, during our fiscal year ended December 31, 2013, we did not pay any fees to, make any equity awards or non-equity awards to or pay any other compensation to the non-employee members of our board of directors. Andrew Hindman, our former chief executive officer, received no compensation for his service as a director, and is not included in the table below.


Name	Fees Earned or Paid in Cash ($)		Option Awards ($)^(1)(2)(3)		All Other Compensation ($)			Total ($)
Carol L. Brosgart, M.D.	$	10,000		5,600		102,500	⁽⁴⁾		118,100
Laurent Fischer, M.D.⁽⁵⁾		8,000		8,750		—			16,750
Patrick Heron		—		—		—			—
Michael J. Kamdar⁽⁶⁾		6,000		5,600		—			11,600
Jack Nielsen⁽⁷⁾		—		—		—			—
Daniel K. Turner III⁽⁶⁾		—		—		—			—
Eckard Weber, M.D.		—		—		—			—

(1)

(2)

Represents options granted in February 2013 that vest and become exercisable in full immediately prior to the consummation of a strategic transaction prior to December 31, 2013, provided that the optionee remains in continuous service to us through such date.

(3)

As of December 31, 2013, Dr. Fischer held outstanding options to purchase 55,024 shares of our common stock, Dr. Brosgart held outstanding options to purchase 6,058 shares of our common stock, Mr. Kamdar held outstanding options to purchase 3,407 shares of our common stock and Messrs. Heron and Turner and Dr. Weber each held outstanding options to purchase 3,029 shares of our common stock.

(4)

Represents the aggregate consulting fees earned by Dr. Brosgart during the fiscal year ended December 31, 2013 related to services under her consulting agreement.

(5)

Dr. Fischer, our current Chief Executive Officer, is included in the table above since he was a non-employee director during the year ended December 31, 2013.

(6)

Messrs. Kamdar and Turner resigned as directors in April 2014.

(7)

Mr. Nielsen resigned as a director in May 2014.

We have entered into a consulting agreement with Dr. Brosgart pursuant to which she has agreed to provide us with certain advisory and consulting services. In consideration for such services, we agreed to pay Dr. Brosgart $9,165 per month for consulting services, as well as pay or reimburse her for all reasonable out-of-pocket expenses directly related to the performance of her duties and responsibilities to us under the agreement. Dr. Brosgart was paid $0, $0 and $102,500 under the consulting agreement in 2011, 2012 and 2013, respectively.

Non-Employee Director Compensation

Although we granted an option to our non-employee directors who were not affiliated with certain of our investors in February 2013, as reflected in the table above, prior to this offering we have not had any established policy with regard to compensation payable to non-employee members of our board of directors. In April 2014, we granted Dr. Brosgart an option to purchase 13,254 shares of our common stock and Michael Kamdar an option to purchase 757 shares of our common stock. In connection with Mr. Gibbs’s appointment to the Board in April 2014, we granted him an option to purchase 15,147 shares of our common stock. Jeffrey H. Cooper, Gwen A. Melincoff and Graeme J. Moyle were appointed to our board of directors in June 2014 and in connection with their appointments, we granted each of them an option to purchase 9,467 shares of our common stock.

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Following the effectiveness of this offering, each of our non-employee directors will receive the following cash compensation for board services, as applicable:

•

$35,000 per year for service as a board of directors member;

•

$15,000 per year for service as chairman of the Audit Committee;

•

$10,000 per year for service as chairman of the Compensation Committee;

•

$7,500 per year for service as chairman of the Nominating and Corporate Governance Committee;

•

$7,500 per year for service as non-chairman member of the Audit Committee;

•

$5,000 per year for service as non-chairman member of the Compensation Committee; and

•

$3,750 per year for service as non-chairman member of the Nominating and Corporate Governance Committee.

Non-employee members of our board of directors will also receive automatic grants of non-statutory stock options under our 2014 Equity Incentive Plan (our 2014 Plan). For purposes of our automatic director grant program, a non-employee director is a director who is not employed by us and who does not receive compensation from us or have a business relationship with us that would require disclosure under certain SEC rules. Each non-employee director joining our board of directors will automatically be granted a non-statutory stock option to purchase 5,301 shares of common stock with an exercise price equal to the fair market value of our common stock on the grant date. This initial option will vest ratably in annual installments over three years of service following the date of grant.

In addition, on the date of each annual meeting of our stockholders, each non-employee director will automatically be granted a non-statutory stock option to purchase 3,029 shares of our common stock on that date with an exercise price equal to the fair market value of our common stock on the grant date. A non-employee director who receives an initial award will not receive the additional annual award in the same calendar year. Automatic annual grants vest in full on the one-year anniversary of the grant date.

If we are subject to a change in control, then all of the directors’ automatic grants will become fully vested. All automatic director options have a maximum term of ten years.

We will also reimburse our non-employee directors for their reasonable out-of-pocket expenses incurred in attending board of directors and committee meetings.

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EXECUTIVE COMPENSATION

Fiscal Year 2013 Summary Compensation Table

The following table provides information concerning the compensation paid to our former President and Chief Executive Officer and our other next two most highly compensated executive officers during the year ended December 31, 2013, which include our current Chief Medical Officer and our former Chief Financial Officer. We refer to these individuals as our named executive officers.


Name and Principal Position	Year		Salary ($)		Option Awards($)⁽¹⁾			Non-Equity Incentive Plan Compensation ($)		All Other Compensation ($)		Total ($)
Andrew Hindman		2013		360,000		109,119⁽³	⁾⁽⁶⁾		—		—		469,119
Former President and Chief Executive Officer⁽²⁾
Éric Lefebvre, M.D.		2013		335,000		27,927⁽⁴	⁾⁽⁶⁾		—		2,645		365,572
Chief Medical Officer
Caroline Loewy		2013		300,000		—			—		2,707		302,707
Former Executive Vice President and Chief Financial Officer⁽⁵⁾

(1)

Represents the aggregate grant date fair value of option awards granted during the year ended December 31, 2013. See Note 9 to Notes to Financial Statements included elsewhere in this prospectus for a discussion of the assumptions made by us in determining the grant date fair value of our equity awards. In accordance with SEC rules, the grant date fair value of an award subject to performance conditions is based on the probable outcome of the conditions.

(2)

Mr. Hindman’s employment with us terminated in January 2014.

(3)

Amount reflects the probable achievement of performance conditions applicable to shares subject to an option granted to Mr. Hindman. The maximum grant date fair value of this award, assuming all of the performance conditions were to be achieved, was $109,119.

(4)

Amount reflects the probable achievement of performance conditions applicable to shares subject to an option granted to Dr. Lefebvre. The maximum grant date fair value of this award, assuming all of the performance conditions were to be achieved, was $27,927.

(5)

Ms. Loewy’s employment with us terminated in February 2014. Following the termination of her employment, we engaged Ms. Loewy as a consultant for a one-year term.

(6)

These options were to vest and become exercisable in full immediately prior to the achievement of a performance goal relating to potential strategic transactions prior to December 31, 2013, provided that the optionee had provided continuous service to us through the date of the consummation of such strategic transactions.

Narrative Explanation of Certain Aspects of the Summary Compensation Table

The compensation paid to our named executive officers consists of the following principle components:

•

base salary;

•

performance based cash bonuses; and

•

incentive compensation in the form of stock options.

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Base Salaries

In February 2013, the compensation committee of our board of directors approved an increase to the annual base salaries of Andrew Hindman and Éric Lefebvre, M.D. retroactive to January 1, 2013. There were no adjustments to Caroline Loewy’s base salary of $300,000 during the year ended December 31, 2013. As such, the base salaries of our named executive officers for 2013 compared to the year ended December 31, 2012 were as follows:


Name	2012 Base Salary ($)		2013 Base Salary ($)
Andrew Hindman		347,650		360,000
Éric Lefebvre, M.D.		325,000		335,000
Caroline Loewy		300,000		300,000

Performance-Based Cash Bonuses

Pursuant to offer letters with Andrew Hindman, Éric Lefebvre, M.D. and Caroline Loewy, each named executive officer was eligible to earn an annual incentive cash bonus based on objective or subjective criteria established by our board of directors or its compensation committee equal to a specified percentage of his or her base salary (40% with respect to Mr. Hindman, 35% with respect to Dr. Lefebvre and 25% with respect to Ms. Loewy). None of our named executive officers was awarded an annual incentive bonus for the year ended December 31, 2013.

In March 2014, our compensation committee approved the payment of a cash retention bonus to Dr. Lefebvre in the amount of $80,901 upon the consummation of this offering.

Stock Options

We offer stock options to our employees, including our named executive officers, as the long-term incentive component of our compensation program. Our stock options allow our employees to purchase shares of our common stock at a price equal to the fair market value of our common stock on the date of grant as determined by our board of directors or the compensation committee of our board of directors. Our stock options granted to newly hired employees generally vest as to 25% of the total number of option shares on the first anniversary of the award and in equal monthly installments over the following 36 months.

On July 15, 2014, our board of directors approved that options to purchase 162,685 shares of common stock at an exercise price equal to the initial public offering price set forth on the cover of this prospectus be granted coincident with the consummation of this offering, of which 94,158 will be awarded to executive officers.

On February 7, 2013, our board of directors granted options to purchase shares of our common stock to Andrew Hindman and Éric Lefebvre, M.D. Caroline Loewy did not receive any equity grants during the year ended December 31, 2013. The option grants to Andrew Hindman and Éric Lefebvre, M.D. were intended to incentivize such officers to achieve our goal of consummating a strategic transaction during 2013. Such options were granted under our 2010 Stock Plan (our 2010 Plan):


Name	Number of Shares Underlying Option Grants (#)⁽¹⁾		Exercise Price ($)
Andrew Hindman		59,032		5.02
Éric Lefebvre, M.D.		15,108		5.02

(1)

These options were to vest and become exercisable in full immediately prior to the achievement of a performance goal relating to potential strategic transactions prior to December 31, 2013 provided that the optionee had provided continuous service to us through the date of the consummation of such strategic transactions.

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Outstanding Equity Awards at 2013 Fiscal Year-End

The following table sets forth information regarding each unexercised option held by each of our named executive officers as of December 31, 2013.


	Option Awards
Name	Number of Securities Underlying Unexercised Options Exercisable (#)		Number of Securities Underlying Unexercised Options Unexercisable (#)			Option Exercise Price ($)		Option Expiration Date
Andrew Hindman		157,491		72,072	(1)	$	4.49		4/6/2021	(2)
Éric Lefebvre, M.D.		27,623		27,814	(3)	$	5.02		2/15/2022
Caroline Loewy		23,599		47,786	(4)	$	5.02		9/18/2022	(5)

(1)

Option was to vest over four years of continuous service following April 4, 2011, with 25% vesting upon completion of one year of service and the remainder in 36 equal monthly installments thereafter. Option terminated with respect to 71,738 unvested shares subject to this option on January 31, 2014 upon the termination of Mr. Hindman’s service with us.

(2)

Pursuant to Mr. Hindman’s separation agreement with us, this option is exercisable with respect to the 157,824 vested shares until October 31, 2014. Following such date, the option will expire to the extent not previously exercised by Mr. Hindman.

(3)

Option vests over four years of continuous service following January 3, 2012, with 25% vesting upon completion of one year of service and the remainder in 36 equal monthly installments thereafter.

(4)

Option was to vest over four years of continuous service following September 4, 2012, with 25% vesting upon completion of one year of service and the remainder in 36 equal monthly installments thereafter. Option terminated with respect to 46,103 unvested shares subject to this option on February 15, 2014 upon the termination of Ms. Loewy’s employment with the Company.

(5)

Pursuant to Ms. Loewy’s consultant agreement with us entered into following the termination of Ms. Loewy’s employment, this option is exercisable with respect to the 25,282 vested shares until the later of (a) two weeks following the termination of the consulting agreement and (b) June 16, 2014. Following such date, the option will expire to the extent not previously exercised by Ms. Loewy.

Severance Benefits

Andrew Hindman

In February 2014, we entered into a separation agreement and general release of all claims with Andrew Hindman in connection with the termination of his employment with us. Pursuant to such agreement and his offer letter, Mr. Hindman is entitled to receive continued payment of his base salary for six months. In addition, we agreed to reimburse Mr. Hindman for the employer portion of his and his dependents’ healthcare continuation coverage under COBRA until the earliest of (a) six months following the month of his termination, (b) the expiration of his continuation coverage under COBRA or (c) the date when he becomes eligible for substantially equivalent health insurance in connection with new employment or self-employment. Pursuant to the separation agreement, we agreed to extend the exercise period with respect to the 157,824 shares vested as of his termination date subject to a 2011 option grant until October 31, 2014. The remaining unvested shares subject to such option expired on his termination date. The value of his cash severance is $180,000 and the value of his COBRA premiums is an estimated $6,000.

Éric Lefebvre, M.D.

In connection with the commencement of his employment with us in January 2012, we entered into an offer letter with Éric Lefebvre, M.D. Pursuant to such letter, if Dr. Lefebvre’s employment is terminated by us without cause or he resigns for good reason, he will be entitled to receive continued payment of his base salary for six months and we will pay the same portion of his monthly healthcare continuation coverage under COBRA as we

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pay for active employees until the earliest of (a) six months following the date of his termination, (b) the expiration of his continuation coverage under COBRA or (c) the date when he becomes eligible for substantially equivalent health insurance in connection with new employment or self-employment. Such benefits are contingent on Dr. Lefebvre’s executing and not revoking a general release of all claims against us. Dr. Lefebvre’s current annual base salary is $346,700.

For purposes of his offer letter, cause means Dr. Lefebvre’s (a) unauthorized use or disclosure of our confidential information or trade secrets, which use or disclosure causes material harm to us, (b) material breach of any agreement between him and our Company which he fails to correct after receiving 30 days written notification, (c) material failure to comply with our written policies or rules which he fails to correct after receiving 15 days written notification, (d) conviction of, or plea of “guilty” or “no contest” to, a felony under the laws of the United States or any State, (e) gross negligence or willful misconduct, (f) continuing failure to perform assigned duties which he fails to correct after receiving 15 days written notification or (g) failure to cooperate in good faith with a governmental or internal investigation of us or our directors, officers or employees, if we have requested his cooperation.

For purposes of his offer letter, Dr. Lefebvre will be deemed to resign for good reason if he resigns within 12 months after one of the following conditions has come into existence without his consent (a) a material diminution (greater than 15%) of his base salary (unless such diminution is part of a general reduction in the base salary of all of our employees), (b) a material diminution of his authority, duties or responsibilities, (c) a requirement that he relocates his primary residence more than 75 miles from his current residence or (d) any continued material breach by us of our obligations under his offer letter which we fail to correct after receiving 15 days written notification. A resignation for good reason will not be deemed to have occurred unless Dr. Lefebvre gives us written notice of the condition within 90 days after the condition comes into existence and we fail to remedy the condition within 30 days after receiving his written notice.

Consulting Agreement with Caroline Loewy

In connection with the termination of her employment with us in February 2014, we entered into a consulting agreement with Caroline Loewy. Pursuant to such agreement, we engaged Ms. Loewy as a consultant for a one-year period. We agreed to pay Ms. Loewy $500.00 per hour for services performed under the consulting agreement, not to exceed $5,000 in any given calendar month without consent from our chief executive officer or chairman of our board. In addition, we agreed to extend the exercise period with respect to the 25,282 vested shares subject to a 2012 option grant until the later of (a) two weeks following the termination of the consulting agreement and (b) June 16, 2014. We terminated the agreement with Ms. Loewy effective August 3, 2014. Accordingly, the exercise period with respect to the 25,282 vested shares ends on August 17, 2014.

Retirement Benefits

We have established a 401(k) tax-deferred savings plan, which permits participants, including our named executive officers, to make contributions by salary deduction pursuant to Section 401(k) of the Internal Revenue Code. We are responsible for administrative costs of the 401(k) plan. We may, at our discretion, make matching contributions to the 401(k) plan.

Employee Benefits and Perquisites

Our named executive officers are eligible to participate in our health and welfare plans to the same extent as all full-time employees would be eligible generally. We do not provide our named executive officers with perquisites or other personal benefits.

Offer Letter with Our Current Chief Executive Officer

In February 2014, we entered into a consulting agreement with Laurent Fischer, M.D. pursuant to which we agreed to pay him $192,500 per year, payable in accordance with our standard payroll schedule. This consultant

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agreement was superseded by the offer letter entered into between Dr. Fischer and us in connection with the commencement of his employment as our Chief Executive Officer in March 2014 described below.

In March 2014, we entered into an offer letter with Dr. Fischer in connection with his appointment as our chief executive officer and chairman of our board of directors. Dr. Fischer’s offer letter provides that he is an “at-will” employee and his employment may be terminated at any time by us or Dr. Fischer. Under the offer letter, Dr. Fischer’s initial base salary was $385,000 per year, and Dr. Fischer was initially eligible to receive an annual cash incentive bonus based on objective or subjective criteria established by our board of directors or its compensation committee equal to 40% of his base salary, which amount shall not be prorated for 2014. Our board of directors or compensation committee adjusts Dr. Fischer’s salary and bonus potential from time to time. Pursuant to the offer letter agreement, Dr. Fischer received an option to purchase up to 410,571 shares of common stock in April 2014, which vests as to 25% of the shares subject to the option after 12 months of Dr. Fischer’s continuous service and as to the remaining shares in equal monthly installments over the next 36 months of his continuous service. The option will be subject to full acceleration upon a change in control of the company. Dr. Fischer’s offer letter also provides that Dr. Fischer is eligible to participate in our general employee benefit plans in accordance with the terms and conditions of such plans and that his employee benefits will be commensurate with benefits paid to our other senior executives.

If we terminate Dr. Fischer’s employment without cause (as defined in the agreement) or Dr. Fischer terminates his employment for good reason (as defined in the agreement), he will be entitled to receive continued payment of his base salary for nine months and we will pay the same portion of his monthly healthcare continuation coverage under COBRA as we pay for active employees until the earliest of (a) six months following the date of his termination, (b) the expiration of his continuation coverage under COBRA or (c) the date when he becomes eligible for substantially equivalent health insurance in connection with new employment or self-employment. However, in the event that we terminate Dr. Fischer’s employment without cause or Dr. Fischer terminates his employment for good reason following a change in control of our Company, we will make a lump sum payment to Dr. Fischer equal to one year of his then effective base salary in lieu of the nine months of salary continuation. Such benefits are contingent on Dr. Fischer’s executing and not revoking a general release of all claims against us.

Offer Letter with Our Current Chief Financial Officer

In March 2014, we entered into an offer letter with Christopher Peetz in connection with his appointment as our chief financial officer. Mr. Peetz’s offer letter provides that he is an “at-will” employee and his employment may be terminated at any time by us or Mr. Peetz. Under the offer letter, Mr. Peetz’s initial base salary was $265,000 per year, and Mr. Peetz was initially eligible to receive an annual cash incentive bonus based on objective or subjective criteria established by our board of directors or its compensation committee equal to 25% of his base salary, which amount shall be prorated for 2014. Our board of directors or compensation committee adjusts Mr. Peetz’s salary and bonus potential from time to time. Pursuant to the offer letter, Mr. Peetz received an option to purchase up to 69,796 shares of common stock in April 2014, which vests as to 25% of the shares subject to the option after 12 months of Mr. Peetz’s continuous service and as to the remaining shares in equal monthly installments over the next 36 months of his continuous service. The option will be subject to full acceleration upon a change in control of the company. Mr. Peetz’s offer letter also provides that Mr. Peetz is eligible to participate in our general employee benefit plans in accordance with the terms and conditions of such plans and that his employee benefits will be commensurate with benefits paid to our other senior executives.

If we terminate Mr. Peetz’s employment without cause (as defined in the agreement) or Mr. Peetz terminates his employment for good reason (as defined in the agreement), he will be entitled to receive continued payment of his base salary for six months and we will pay the same portion of his monthly healthcare continuation coverage under COBRA as we pay for active employees until the earliest of (a) six months following the date of his termination, (b) the expiration of his continuation coverage under COBRA or (c) the date when he becomes eligible for substantially equivalent health insurance in connection with new employment or self-employment. However, in

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the event that we terminate Mr. Peetz’s employment without cause or Mr. Peetz terminates his employment for good reason following a change in control of our Company, we will make a lump sum payment to Mr. Peetz equal to one year of his then effective base salary in lieu of the six months of salary continuation. Such benefits are contingent on Mr. Peetz executing and not revoking a general release of all claims against us.

Equity Plans

2014 Equity Incentive Plan

Our board of directors and stockholders have adopted our 2014 Equity Incentive Plan (the 2014 Plan). The 2014 Plan became effective immediately upon adoption although no awards may be made under it until the effective date of an initial public offering. Our 2014 Plan will replace our 2010 Plan, and no further grants will be made under such 2010 Plan following this offering. However, options outstanding under the 2010 Plan and our 2007 Plan will continue to be governed by their existing terms.

Share Reserve. The number of shares of our common stock initially available for issuance under our 2014 Plan will equal 1,500,000 shares. The number of shares reserved for issuance under the 2014 Plan will be increased automatically on January 1 of each year during the term of the plan, starting with 2015, by a number equal to the smallest of:

•

930,000 shares;

•

4% of the shares of common stock outstanding on the last business day of the prior fiscal year; or

•

a number of shares determined by our board of directors.

In general, if awards under the 2014 Plan are forfeited, terminate, expire or lapse without the issuance of shares, if we repurchase shares issued under the 2014 Plan, if shares are applied to pay the exercise or purchase price of an award or are withheld to satisfy tax obligations with respect to any award, then such shares will again become available for awards. All share numbers described in this summary of the 2014 Plan will automatically adjust in the event of a stock split, a stock dividend, or a reverse stock split.

Administration. Our compensation committee will administer the 2014 Plan. The committee has complete discretion to make all decisions relating to the 2014 Plan and outstanding awards, including repricing outstanding options and modifying outstanding awards.

Eligibility. Employees, non-employee directors and consultants will be eligible to participate in our 2014 Plan.

Types of Award. Our 2014 Plan provides for the following types of awards:

•

incentive and nonstatutory stock options;

•

stock appreciation rights;

•

direct award or sale of shares of our common stock;

•

stock units; and

•

performance cash awards.

Options and Stock Appreciation Rights. The exercise price for options granted under the 2014 Plan may not be less than 100% of the fair market value of our common stock on the grant date. Optionees may pay the exercise price in cash or, with the consent of the compensation committee and as set forth in the applicable agreement:

•

with shares of common stock that are already owned;

•

by an immediate sale of the shares acquired through a broker approved by us;

•

through a net exercise procedure; or

•

by other methods permitted by applicable law.

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A participant who exercises a stock appreciation right will receive the increase in value of our common stock over the base price. The base price for stock appreciation rights may not be less than 100% of the fair market value of our common stock on the grant date. The settlement value of a stock appreciation right may be paid in cash or shares of common stock or a combination of both.

Options and stock appreciation rights will vest at the time or times determined by the compensation committee. In most cases, they will vest over a four-year period following the date of grant. Options and stock appreciation rights also will expire at the time determined by the compensation committee but in no event more than 10 years after they are granted. These awards generally will expire earlier if the participant’s service terminates earlier. No participant may be granted stock options and stock appreciation rights covering more than 3,000,000 shares during any single fiscal year, other than to a new employee in the fiscal year in which service commences.

Restricted Shares and Stock Units. Restricted shares and stock units may be awarded under the 2014 Plan in return for any lawful consideration (and as set forth in the applicable award agreement), and participants who receive restricted shares or stock units generally are not required to pay for their awards. In general, these awards will be subject to vesting. Vesting may be based on length of service, the attainment of performance-based milestones, or a combination of both, as determined by the compensation committee. No participant may be granted awards of restricted shares and stock units covering more than 3,000,000 shares during any single fiscal year, other than to a new employee in the fiscal year in which service commences. This annual limit is in addition to any stock options and stock appreciation rights the participant may receive during a fiscal year. Settlement of vested stock units may be made in the form of cash, shares of common stock, or a combination of both.

Performance Cash Awards. Performance cash awards may be granted under the 2014 Plan that qualify as performance-based compensation that is not subject to the income tax deductibility limitations imposed by Section 162(m) of the Code, if the award is approved by our compensation committee and the grant or vesting of the award is tied solely to the attainment of performance goals during a designated performance period. No participant may be paid more than $3.0 million in cash in any fiscal year pursuant to a performance cash award granted under the 2014 Plan.

Performance goals for the grant or vesting of awards under the 2014 Plan may include earnings (before or after taxes); earnings per share; earnings before interest, taxes, depreciation and amortization; total stockholder return; stockholders equity or return on equity or average stockholders’ equity; return on assets, investment or capital employed; operating income; gross margin; operating margin; net operating income (before or after taxes); return on operating revenue; specified levels or changes in sales or revenue; expense or cost reduction; working capital; economic value added; market share; cash flow; operating cash flow; cash flow per share; share price; debt reduction; customer satisfaction; contract awards or backlog; or other objective corporate or individual strategic or individual performance goals. To the extent a performance award is not intended to comply with Section 162(m) of the Code, the compensation committee may select other measures of performance.

Corporate Transactions. In the event we are a party to a merger, consolidation or a change in control transaction, outstanding awards granted under the 2014 Plan, and all shares acquired under the 2014 Plan, will be subject to the terms of the definitive transaction agreement or, if there is no such agreement, as determined by our compensation committee. Unless an award agreement provides otherwise, such treatment may include without limitation any of the following with respect to each outstanding award:

•

the continuation, assumption or substitution of an award by us or the surviving entity or its parent;

•

the cancellation of options and stock appreciation rights without payment of any consideration;

•

the cancellation of the vested portions of the awards in exchange for a payment equal to the product of the number of shares subject to the award multiplied by the excess, if any, of the per share value of property that a holder of our common stock receives in the transaction over (if applicable) the exercise price of such award; or

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•

the assignment of any repurchase, forfeiture or reacquisition rights in favor of us to the surviving entity or its parent.

The compensation committee has the discretion to provide that an award granted under the 2014 Plan will vest on an accelerated basis if a change in control of our company occurs or if the participant is subject to an involuntary termination, either at the time such award is granted or afterward.

A change in control includes:

•

our merger or consolidation with or into another entity after which our stockholders own 50% or less of the voting power of the stock of the surviving entity or its parent;

•

a sale or other disposition of all or substantially all of our assets; or

•

an acquisition of more than 50% of our outstanding voting stock by any person or group.

The compensation committee is not required to treat all awards, or portions thereof, in the same manner.

Changes in Capitalization. In the event that there is a change in the capital structure of our common stock, such as a stock split, reverse stock split, or dividend paid in common stock, proportionate adjustments will automatically be made to the kind and maximum number of shares:

•

reserved for issuance under the 2014 Plan;

•

by which the share reserve may increase automatically each year;

•

subject to stock awards that can be granted to a participant in a year (as established under the 2014 Plan pursuant to Section 162(m) of the Code);

•

that may be issued upon the exercise of incentive stock options; and

•

covered by each outstanding option, stock appreciation right and stock unit, the exercise price applicable to each outstanding option and stock appreciation right, and the repurchase price, if any, applicable to restricted shares.

In the event that there is a declaration of an extraordinary dividend payable in a form other than our common stock in an amount that has a material effect on the price of our common stock, a recapitalization, a spin-off or a similar occurrence, the compensation committee may make such adjustments as it deems appropriate, in its sole discretion, to one or more of the foregoing.

Amendments or Termination. Our board of directors may amend or terminate the 2014 Plan at any time and for any or no reason. If our board of directors amends the 2014 Plan, it does not need to ask for stockholder approval of the amendment unless required by applicable law or exchange listing requirements. The 2014 Plan will continue in effect for 10 years, unless our board of directors decides to terminate the plan earlier or unless our board of directors and stockholders later approve an extension of this term.

2010 Stock Plan

Our 2010 Stock Plan, or the 2010 Plan, was adopted by our board of directors in February 2010 and approved by our stockholders in March 2010. No further awards will be made under our 2010 Plan following this offering. However, awards outstanding under our 2010 Plan following this offering will continue to be governed by their existing terms.

Share Reserve. 1,160,904 shares of our common stock have been reserved for issuance under the 2010 Plan. As of September 30, 2014, options to purchase 916,286 shares of our common stock were outstanding under the 2010 Plan.

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Administration. The compensation committee of our board of directors administers the 2010 Plan. The committee has the complete discretion to make all decisions relating to the plan and outstanding awards, including repricing outstanding options and modifying outstanding awards in other ways.

Eligibility. Employees, non-employee directors and consultants are eligible to participate in our 2010 Plan.

Types of Awards. The 2010 Plan provides for the following types of awards granted with respect to shares of our common stock:

•

incentive and nonstatutory stock options to purchase shares of our common stock; and

•

direct award or sale of shares of our common stock, including restricted shares.

Payment. The exercise price for options granted under the 2010 Plan is determined by our board of directors or the compensation committee, but may not be less than 100% of the fair market value of our common stock on the grant date. Optionees may pay the exercise price by using:

•

cash or cash equivalents;

•

shares of common stock that the optionee already owns;

•

a promissory note;

•

an immediate sale of the option shares through a broker approved by us, if the shares of our common stock are publicly traded; or

•

any other form permitted by the Delaware General Corporation Law, as amended.

Shares may be awarded under the 2010 Plan in consideration of services rendered to us prior to the award.

Changes in Capitalization. In the event that there is a specified type of change in our capital structure without our receipt of consideration, such as a stock split or reverse stock split, proportionate adjustments will automatically be made to (i) the number of shares reserved for issuance under the 2010 Plan, (ii) the number of shares covered by each outstanding option and (iii) the exercise price applicable to each outstanding option. In the event that there is a declaration of an extraordinary dividend payable in a form other than our common stock in an amount that has a material effect on the price of our common stock, a recapitalization, a spin-off or a similar occurrence, the board of directors may make such adjustments as it deems appropriate in the number of shares reserved for issuance under the 2010 Plan, the number of shares covered by each outstanding option or the exercise price applicable to each outstanding option, in its sole discretion.

Corporate Transactions. In the event that we are a party to a merger or consolidation, all outstanding awards will be governed by the terms of the definitive transaction agreement, which need not treat all outstanding options in an identical manner. Unless an individual stock agreement provides otherwise, such definitive agreement, without the optionees’ consent, shall provide for one or more of the following with respect to options that are exercisable as of the effective date of such merger or consolidation:

•

the continuation, assumption or substitution of an option by a surviving entity or its parent;

•

the cancellation of the unvested portion of an option without payment of any consideration; or

•

the cancellation of the option in exchange for a payment equal to the excess, if any, of the value that the holder of each share of common stock receives in the transaction over the per share exercise price of the option.

Amendments or Termination. Our board of directors may, at any time and for any reason, amend or terminate the 2010 Plan. If our board of directors amends the plan, it does not need stockholder approval of the amendment unless the amendment increases the number of shares available for issuance or materially changes

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the class of persons eligible to receive incentive stock options. The 2010 Plan will terminate automatically ten years after the later of the date when our board of directors adopted the plan or the date when our board of directors most recently approved an increase in the number of shares reserved thereunder which was also approved by our stockholders.

2007 Plan

Our 2007 Stock Plan, or the 2007 Plan, was adopted by our board of directors and approved by our stockholders in August 2007. No further awards have been made under our 2007 Plan since the adoption of our 2010 Plan, and no further awards will be made under our 2007 Plan following this offering. However, awards outstanding under our 2007 Plan following this offering will continue to be governed by their existing terms.

Share Reserve. As of September 30, 2014, options to purchase 9,654 shares of our common stock were outstanding under the 2007 Plan.

Administration. The compensation committee of our board of directors administers the 2007 Plan. The committee has the complete discretion to make all decisions relating to the plan and outstanding awards, including repricing outstanding options and modifying outstanding awards in other ways.

Eligibility. Employees, non-employee directors and consultants are eligible to participate in our 2007 Plan.

Types of Awards. Our 2007 Plan provides for the following types of awards granted with respect to shares of our common stock:

•

incentive and nonstatutory stock options to purchase shares of our common stock; and

•

direct award or sale of shares of our common stock, including restricted shares.

Payment. The exercise price for options granted under the 2007 Plan is determined by our board of directors or the compensation committee, but, in general, may not be less than 100% of the fair market value of our common stock on the grant date. Optionees may pay the exercise price by using any combination of the following as approved by the administrator:

•

cash or cash equivalents;

•

shares of common stock that the optionee already owns;

•

a promissory note;

•

cancellation of indebtedness;

•

an immediate sale of the option shares through a broker approved by us, if the shares of our common stock are publicly traded.

Changes in Capitalization. In the event that there is a specified type of change in our capital structure without our receipt of consideration, such as a stock split, reverse stock split, stock dividend, combination, recapitalization or reclassification of our common stock, proportionate adjustments will be made by our compensation committee to (i) the number of shares covered by each outstanding option and (ii) the exercise price applicable to each outstanding option. In the event that there is a declaration of an extraordinary dividend payable in a form other than our common stock or cash, the compensation committee may make such adjustments as it deems appropriate, in its discretion.

Corporate Transactions. In the event that of a corporate transaction, each outstanding option under the 2007 Plan shall be assumed or an equivalent option or right shall be substituted by such successor corporate or a parent or

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subsidiary of such successor corporation, unless the successor does not agree to assume the award or to substitute an equivalent option or right, in which case such option shall terminate upon consummation of the transaction. For purposes of the 2007 Plan, a corporate transaction includes the sale of all or substantially all of our assets, or a merger, consolidation or other capital reorganization or business combination transaction of us with or into another corporation, entity or person, or the direct or indirect acquisition (including by way of a tender or exchange offer) by any person, or persons acting as a group, of beneficial ownership or a right to acquire beneficial ownership of shares representing a majority of the voting power of our then outstanding capital stock

Amendments or Termination. Our board of directors may, at any time and for any reason, amend or terminate the 2007 Plan unless such action materially and adversely affect options previously granted.

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CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS

In addition to the cash and equity compensation arrangements of our directors and named executive officers discussed above under “Management–Director Compensation” and “Executive Compensation,” the following is a description of transactions since January 1, 2011, to which we have been a party in which the amount involved exceeded or will exceed $120,000 and in which any of our directors, executive officers, beneficial holders of more than 5% of our capital stock, or entities affiliated with or immediate family members of any of the foregoing, had or will have a direct or indirect material interest.

Sales of Convertible Preferred Stock

The following table summarizes purchases of our convertible preferred stock since January 1, 2011 by holders of more than 5% of our capital stock and their affiliated entities.


Purchaser	Affiliated Tobira Director	Shares of Preferred Stock⁽¹⁾			Aggregate Purchase Price ($)
Purchaser	Affiliated Tobira Director	Series	Number of Shares		Aggregate Purchase Price ($)
Novo A/S	Jack Nielsen⁽²⁾	Series B		344,830	$	4,999,999
Domain Partners VII, L.P.	Eckard Webber	Series B		298,581	$	4,329,383
DP VII Associate, L.P.	Eckard Webber	Series B		5,092	$	73,842
Frazier Healthcare V, L.P.	Patrick Heron	Series B		233,595	$	3,387,096
Montreux Equity Partners IV, LP	Daniel K. Turner III⁽³⁾	Series B		163,516	$	2,370,967

Total				1,045,614	$	15,161,287

(1)

Each share of Series B preferred stock will convert into one share of common stock immediately prior to the closing of this offering.

(2)

Mr. Nielsen resigned as a director in May 2014.

(3)

Mr. Turner resigned as a director in April 2014.

Investors’ Rights Agreement

In connection with the sale of our Series B preferred stock, we entered into an amended and restated investors’ rights agreement with the holders of all of our outstanding shares of convertible preferred stock. Pursuant to this agreement, we granted such stockholders certain registration rights with respect to shares of our common stock and a right of first offer with respect to future issuances of the Company’s securities. Certain provisions of this agreement will terminate pursuant to the terms of the agreement upon the completion of this offering. For more information regarding this agreement, see “Description of Capital Stock—Registration Rights.”

Voting Agreement

In connection with the sale of our Series B preferred stock we, along with certain holders of our common stock and holders of all of our outstanding shares of preferred stock, entered into an amended and restated voting agreement. Under the terms of the voting agreement, the parties have agreed, subject to certain conditions, to vote their shares so as to elect as directors the nominees designated by certain of our investors, including Domain Partners VII, L.P., which designated Eckard Weber, M.D., Frazier Healthcare V, L.P., which designated Patrick Heron, Montreux Equity Partners IV, LP, which seat is currently vacant and Novo A/S, which designated Jack Nielsen. Mr. Nielsen resigned from the board of directors in May 2014 and as a result the Novo seat is currently vacant. In addition, the parties to the voting agreement have agreed to vote their shares so as to elect to our board of directors, our Chief Executive Officer, who is currently Laurent Fischer, M.D., and up to three at-large directors designated by the holders of a majority of the outstanding convertible preferred stock, voting as a separate class, who are currently Carol Brosgart, M.D. and Craig S. Gibbs. The voting agreement will terminate immediately prior to the completion of this offering.

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Right of First Refusal and Co-Sale Agreement

In connection with sale of Series B preferred stock, along with certain holders of our common stock and holders of all of our outstanding shares of preferred stock, we entered into an amended and restated right of first refusal and co-sale agreement. This agreement provides for rights of first refusal and co-sale relating to the shares of our common stock and common stock issuable upon conversion of the shares of convertible preferred stock held by the parties thereto. Certain provisions of the right of first refusal and co-sale agreement will terminate immediately prior to the completion of this offering.

Convertible Notes

The following table summarizes issuances of convertible notes to existing securityholders and their affiliated entities since January 1, 2011. The notes accrue interest at a rate of 8% per annum compounded annually. In connection this offering, the notes provide that, unless earlier converted into shares of our capital stock pursuant to their terms, the principal and accrued and unpaid interest due on each note will, at the election of the holders of a majority in interest of the aggregate principal amount of all notes, be either due and payable in full prior to the completion of this offering or converted into shares of Series B preferred stock at a price per share of $14.50. We have entered into an agreement with each of the noteholders whereby the notes will convert into shares of Series B preferred stock immediately prior to and contingent upon the completion of this offering.


Holder	Issue Date	Principal Balance of Convertible Note		Number of Shares of Common Stock to be Received Upon Conversion⁽¹⁾
Novo A/S	July 30, 2012	$	1,812,236		124,982
Canaan VII L.P.	July 30, 2012	$	257,913		17,787
Domain Partners VII, L.P.	July 30, 2012	$	3,422,631		236,045
DP VII Associates, L.P.	July 30, 2012	$	58,377		4,026
Montreux Equity Partners IV, LP	July 30, 2012	$	1,805,393		124,511
Frazier Healthcare V, L.P.	July 30, 2012	$	2,643,201		182,291

Subtotal		$	9,999,751		689,642

Novo A/S	January 22, 2013	$	1,268,565		87,488
Canaan VII L.P.	January 22, 2013	$	180,539		12,451
Domain Partners VII, L.P.	January 22, 2013	$	2,395,842		165,232
DP VII Associates, L.P.	January 22, 2013	$	40,864		2,818
Montreux Equity Partners IV, LP	January 22, 2013	$	1,263,775		87,157
Frazier Healthcare V, L.P.	January 22, 2013	$	1,850,240		127,604

Subtotal		$	6,999,825		482,750

Novo A/S	October 29, 2013	$	906,118		62,491
Canaan VII L.P.	October 29, 2013	$	128,957		8,893
Domain Partners VII, L.P.	October 29, 2013	$	1,711,315		118,022
DP VII Associates, L.P.	October 29, 2013	$	29,189		2,013
Montreux Equity Partners V, LP	October 29, 2013	$	902,696		62,255
Frazier Healthcare V, L.P.	October 29, 2013	$	1,321,600		91,145

Subtotal		$	4,999,875		344,819

Novo A/S	March 18, 2014	$	1,449,789		99,986
Canaan VII L.P.	March 18, 2014	$	206,330		14,229
Domain Partners VII, L.P.	March 18, 2014	$	2,784,807		192,057
Montreux Equity Partners IV, LP	March 18, 2014	$	1,444,314		99,608
Frazier Healthcare V, L.P.	March 18, 2014	$	2,114,561		145,833

Subtotal		$	7,999,801		551,713

Total		$	29,999,252		2,068,924

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(1)

Reflects the conversion of all the convertible notes into Series B preferred stock, and the subsequent conversion of such preferred shares into shares of common stock immediately prior to the completion of this offering.

Warrants Issued in Connection with Convertible Notes

The following table summarizes issuances of warrants to holders of more than 5% of our capital stock and their affiliated entities since January 1, 2011. The warrants were issued to investors in connection with the issuance of convertible notes set forth in the above table and are exercisable for shares of our capital stock pursuant to their terms. The warrants provide that in connection with a public offering of our securities the warrants shall become exercisable for shares of Series B preferred stock at an exercise price of $14.50 per share assuming no anti-dilution adjustments to the Series B preferred stock prior to closing. We have entered into an agreement with each of these warrant holders whereby they will net exercise the warrants effective and contingent upon the completion of this offering.


Holder	Issue Date	Shares of Series B Preferred Stock
Novo A/S	July 30, 2012		31,245
Canaan VII L.P.	July 30, 2012		4,446
Domain Partners VII, L.P.	July 30, 2012		59,011
DP VII Associates, L.P.	July 30, 2012		1,006
Montreux Equity Partners IV, LP	July 30, 2012		31,127
Frazier Healthcare V, L.P.	July 30, 2012		45,572

Novo A/S	January 22, 2013		21,872
Canaan VII L.P.	January 22, 2013		3,112
Domain Partners VII, L.P.	January 22, 2013		41,307
DP VII Associates, L.P.	January 22, 2013		704
Montreux Equity Partners IV, LP	January 22, 2013		21,789
Frazier Healthcare V, L.P.	January 22, 2013		31,900

Novo A/S	October 29, 2013		15,622
Canaan VII L.P.	October 29, 2013		2,223
Domain Partners VII, L.P.	October 29, 2013		29,505
DP VII Associates, L.P.	October 29, 2013		503
Montreux Equity Partners V, LP	October 29, 2013		15,563
Frazier Healthcare V, L.P.	October 29, 2013		22,786

Novo A/S	March 18, 2014		24,996
Canaan VII L.P.	March 18, 2014		3,557
Domain Partners VII, L.P.	March 18, 2014		48,014
Montreux Equity Partners IV, LP	March 18, 2014		24,902
Frazier Healthcare V, L.P.	March 18, 2014		36,458

Indemnification Agreements

Prior to the consummation of this offering, we expect to enter into separate indemnification agreements with our directors and executive officers. These agreements, among other things, will provide for indemnification of our directors and executive officers for certain expenses, judgments, fines and settlement amounts, among others, incurred by this person in any action or proceeding arising out of this person’s services as a director or executive officer in any capacity with respect to any employee benefit plan or as a director, partner, trustee or agent of another entity at our request. We believe that these our indemnification agreements, along with the provisions of our amended and restated certificate of incorporation and amended and restated bylaws will be necessary to attract and retain qualified persons as directors and executive officers.

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Participation in Offering

All of our existing principal investors, including Novo A/S, Doman Associates, L.L.C., Frazier Healthcare V, L.P., Canaan VII L.P. and Montreux Equity Partners, and their affiliated entities, have indicated an interest in purchasing an aggregate of approximately $ million of shares of common stock in this offering at the initial public offering price. However, because indications of interest are not binding agreements or commitments to purchase, the underwriters could determine to sell more, less or no shares to any of these investors and their affiliates and any of these investors and their affiliates could determine to purchase more, less or no shares in this offering. The underwriters will receive the same underwriting discounts and commissions on any shares purchased by these persons as they will on any other shares sold to the public in this offering.

Employment Agreements

We have entered into offer letters with certain of our executive officers. For more information regarding these agreements, see the section of this prospectus entitled “Executive Compensation.”

Stock Option Grants to Executive Officers and Directors

We have granted stock options to our executive officers and certain of our directors as more fully described in the section entitled “Management—Director Compensation” and “Executive Compensation.”

Related Party Transaction Policy

We intend to adopt a formal policy that our executive officers, directors, holders of more than 5% of any class of our voting securities, and any member of the immediate family of and any entity affiliated with any of the foregoing persons, are not permitted to enter into a related party transaction with us without the prior consent of our audit committee, or other independent members of our board of directors in the event it is inappropriate for our audit committee to review such transaction due to a conflict of interest. Any request for us to enter into a transaction with an executive officer, director, principal stockholder, or any of their immediate family members or affiliates, in which the amount involved exceeds $120,000 must first be presented to our audit committee for review, consideration and approval. In approving or rejecting any such proposal, our audit committee is to consider the relevant facts and circumstances available and deemed relevant to our audit committee, including, but not limited to, whether the transaction is on terms no less favorable than terms generally available to an unaffiliated third party under the same or similar circumstances and the extent of the related party’s interest in the transaction. All of the transactions described above were entered into prior to the adoption of such policy.

Although we have not had a written policy for the review and approval of transactions with related persons prior to 2014, our board of directors has historically reviewed and approved any transaction where a director or officer had a financial interest, including all of the transactions described above. Prior to approving such a transaction, the material facts as to a director’s or officer’s relationship or interest as to the agreement or transaction were disclosed to our board of directors. Our board of directors would take this information into account when evaluating the transaction and in determining whether such a transaction was fair to the company and in the best interests of all of our stockholders. In addition, for each related party transaction described above, the disinterested directors in the context of each such transaction approved the applicable agreement and transaction.

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PRINCIPAL STOCKHOLDERS

The following table sets forth information regarding the number of shares of common stock beneficially owned on September 30, 2014, and immediately following consummation of this offering, by:

•

each person who is known by us to beneficially own 5% or more of our common stock;

•

each of our named executive officers and directors; and

•

all of our current executive officers and directors as a group.

We have determined beneficial ownership in accordance with SEC rules. Except as indicated by the footnotes below, we believe, based on the information furnished to us, that the persons and entities named in the table below have sole voting and investment power with respect to all shares of common stock that they beneficially own, subject to applicable community property laws.

Applicable percentage ownership is based on 7,066,148 shares of common stock outstanding at September 30, 2014 and assumes (i) the conversion of all outstanding shares of convertible preferred stock, (ii) the conversion of all principal and accrued and unpaid interest through September 30, 2014 on our outstanding convertible notes and (iii) the exercise of outstanding warrants to purchase an aggregate of 586,181 shares of Series B convertible preferred stock issued to our existing investors. For purposes of the column entitled “Shares Beneficially Owned After Offering,” we have assumed that shares of common stock will be issued and outstanding upon completion of this offering. In computing the number of shares of common stock beneficially owned by a person and the percentage ownership of that person, we deemed to be outstanding all shares of common stock subject to options held by that person or entity that are currently exercisable or exercisable within 60 days of September 30, 2014. We did not deem these shares outstanding, however, for the purpose of computing the percentage ownership of any other person.

All of our existing principal investors, including Novo A/S, Doman Associates, L.L.C., Frazier Healthcare V, L.P., Canaan VII L.P. and Montreux Equity Partners, and their affiliated entities, have indicated an interest in purchasing an aggregate of approximately $ million of shares of common stock in this offering at the initial public offering price. However, because indications of interest are not binding agreements or commitments to purchase, the underwriters could determine to sell more, less or no shares to any of these investors and their affiliates and any of these investors and their affiliates could determine to purchase more, less or no shares in this offering. The following table does not reflect any potential purchases by these investors or their affiliated entities. If any shares are purchased by these investors, the number and percentage of shares of our common stock beneficially owned by them after this offering will be higher from those set forth in the following table.

Except as otherwise set forth below, the address of each beneficial owner is c/o Tobira Therapeutics, Inc. 701 Gateway Blvd. Suite 300, South San Francisco, California 94080.


	Shares Beneficially Owned Prior to Offering						Shares Beneficially Owned After Offering
Name of Beneficial Owner	Number			Percentage			Number	Percentage
*5% or Greater Stockholders*
Novo A/S		1,202,090	(1)		17.0	%
Tuborg Havnevej 19 DK-2900 Hellerup Denmark
Funds affiliated with Domain Associates, L.L.C.		2,379,542	(2)		33.7	%
One Palmer Square Princeton, NJ 08542

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	Shares Beneficially Owned Prior to Offering						Shares Beneficially Owned After Offering
Name of Beneficial Owner	Number			Percentage			Number	Percentage
Frazier Healthcare V, L.P.		1,801,203	(3)		25.5	%
601 Union, Two Union Square Suite 3200 Seattle, WA 98101
Funds affiliated with Montreux Equity Partners		1,248,156	(4)		17.7	%
One Ferry Building, Suite 255 San Francisco, CA 94111

*Executive Officers and Directors*
Laurent Fischer, M.D.		53,412	(5)		*
Éric Lefebvre, M.D.		39,515	(6)		*
Christopher Peetz		—			—
Helen Jenkins		16,892	(7)		*
Andrew Hindman		142,273	(8)		2.0	%
Caroline Loewy		—			—
Carol L. Brosgart, M.D.		6,014	(9)		*
Jeffrey H. Cooper		—			—
Craig S. Gibbs		—			—
Patrick Heron		1,804,232	(10)		25.5	%
Gwen A. Melincoff		—			—
Graeme J. Moyle		—			—
Eckard Weber, M.D.		173,441	(11)		2.5	%
All current executive officers and directors as a group (11 persons)		2,093,506	(12)		28.6	%

Represents beneficial ownership of less than 1% of the outstanding shares of our common stock.

(1)

Includes 418,694 shares issuable upon conversion of outstanding convertible notes. Novo A/S is a Danish limited liability company. The board of directors of Novo A/S (the “Novo Board”), which is currently comprised of Sten Scheibye, Göran Ando, Jeppe Christiansen, Steen Riisgaard and Per Wold-Olsen, has shared investment and voting control over our securities held by Novo A/S and may exercise such control only with the support of a majority of the Novo Board. As such, no individual member of the Novo Board is deemed to hold any beneficial ownership or reportable pecuniary interest in our securities. The address of Novo A/S is Tuborg Havnevej 19, 2900 Hellerup, Denmark.

(2)

Includes 25,302 shares held by Domain Associates, L.L.C., 22,487 shares held by DP VII Associates, L.P. and 1,318,543 shares held by Domain Partners VII, L.P. Includes 10,127 shares issuable to DP VII Associates, L.P. and 794,114 shares issuable to Domain Partners VII, L.P. upon conversion of outstanding convertible notes. With regard to the shares beneficially owned by Domain Partners VII, L.P. and DP VII Associates, L.P., the managing members of One Palmer Square Associates VII, L.L.C., the general partner of Domain Partners VII, L.P. and DP VII Associates, L.P., share voting and investment power with respect to these shares. The managing members of One Palmer Square Associates VII, L.L.C. are James C. Blair, Brian H. Dovey, Jesse I. Treu, Kathleen K. Schoemaker, Nicole Vitullo and Brian K. Halak. Each of these individuals disclaims beneficial ownership of such shares, except to the extent of his pecuniary interest. With regard to the shares beneficially owned by Domain Associates, L.L.C., the managing members of Domain Associates, L.L.C. share voting and investment power with respect to these shares. The managing members of Domain Associates, L.L.C. are James C. Blair, Brian H. Dovey, Jesse I. Treu, Kathleen K. Schoemaker, Nicole Vitullo, Brian K. Halak and Kim P. Kamdar. Each of these individuals disclaims beneficial ownership of such shares, except to the extent of his pecuniary interest. Dr. Weber, a member of our board of directors, is an employee of Domain Associates, L.L.C. and a member of One Palmer Square Associates VII, L.L.C. Dr. Weber has no voting or investment power with respect to the shares held by Domain Associates, L.L.C., DP VII Associates, L.P. and Domain Partners VII, L.P.

(3)

Includes 610,677 shares issuable upon conversion of outstanding convertible notes. The general partner of Frazier Healthcare V, L.P. is a limited partnership, the general partner of which is FHM V, LLC. The members

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of FHM V, LLC are Dr. Nathan Every, Alan Frazier, Nader Naini, Patrick Heron, a member of our board of directors, and Dr. James Topper. These individuals share voting and investment power over the shares held by Frazier Healthcare V, L.P. Each of these individuals disclaims beneficial ownership of such shares, except to the extent of his pecuniary interest.

(4)

Includes 29,531 shares held by Montreux IV Associates, L.L.C. and 692,550 shares held by Montreux Equity Partners IV, L.P. Also includes (i) 350,273 shares issuable upon conversion of outstanding convertible notes held by Montreux Equity Partners IV, L.P. and (ii) 66,840 shares issuable upon conversion of outstanding convertible notes held by Montreux Equity Partners V, L.P. John J. Savarese, M.D., Daniel K. Turner III, who resigned as a member of our board of directors in April 2014, and Howard D. Palefsky are the managers of Montreux Equity Management IV, L.L.C., the sole general partner of each of Montreux Equity Partners IV, L.P. and Montreux IV Associates IV, L.L.C. and may be deemed to share voting and investment power over the shares held by each of Montreux Equity Partners IV, L.P. and Montreux IV Associates, L.L.C. Each of these individuals disclaims beneficial ownership of such shares, except to the extent of his pecuniary interest. Daniel K. Turner III is the manager of Montreux Equity Management V, L.L.C., the sole general partner of Montreux Equity Partners V, L.P. and may be deemed to have voting and investment power over the shares held by Montreux Equity Partners V, L.P. Mr. Turner disclaims beneficial ownership of such shares, except to the extent of his pecuniary interest.

(5)

Includes options to purchase 53,412 shares of common stock that may be exercised within 60 days of September 30, 2014.

(6)

Includes options to purchase 39,515 shares of common stock that may be exercised within 60 days of September 30, 2014.

(7)

Includes options to purchase 16,892 shares of common stock that may be exercised within 60 days of September 30, 2014.

(8)

Includes options to purchase 142,273 shares of common stock that may be exercised within 60 days of September 30, 2014.

(9)

Includes options to purchase 6,014 shares of common stock that may be exercised within 60 days of September 30, 2014.

(10)

Includes securities beneficially owned by Frazier Healthcare V, L.P. as set forth in footnote 3 above, for which Mr. Heron may be deemed to share voting and investment power. Mr. Heron disclaims beneficial ownership of the securities held by Frazier Healthcare V, L.P. except to the extent of his pecuniary interest therein, if any. Includes options to purchase 3,029 shares of common stock that may be exercised within 60 days of September 30, 2014.

(11)

Includes 170,412 shares of common stock held by Eckard Weber Living Trust UTA dated November 20, 2007 of which Dr. Weber is the trustee and options held by Dr. Weber to purchase 3,029 shares of common stock that may be exercised within 60 days of September 30, 2014.

(12)

Includes options to purchase 121,891 shares of common stock that may be exercised within 60 days of September 30, 2014.

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DESCRIPTION OF CAPITAL STOCK

General

The following is a summary of the rights of our common stock and preferred stock and certain provisions of our amended and restated certificate of incorporation and amended and restated bylaws, as they will be in effect upon the completion of this offering. For more detailed information, please see our amended and restated certificate of incorporation and amended and restated bylaws, which are filed as exhibits to the registration statement of which this prospectus is part.

Upon the completion of this offering, our authorized capital stock will consist of 165,000,000 shares, with a par value of $0.0001 per share, of which:

•

150,000,000 shares will be designated as common stock; and

•

15,000,000 shares will be designated as preferred stock.

As of September 30, 2014, we had outstanding 4,169,656 shares of common stock held of record by 21 stockholders, assuming the conversion of all outstanding shares of preferred stock into common stock and excluding the conversion of all principal and accrued and unpaid interest on convertible notes outstanding as of September 30, 2014 into an aggregate of 2,310,311 shares of stock immediately prior to the closing of this offering. Upon completion of this offering, no shares of preferred stock will be outstanding.

Common Stock

Each holder of common stock is entitled to one vote per share on all matters submitted to a vote of stockholders. We have not provided for cumulative voting in the election of directors. Subject to preferences that may apply to shares of preferred stock outstanding at the time, the holders of outstanding shares of our common stock are entitled to receive dividends out of assets legally available at the times and in the amounts that our board of directors may determine from time to time. Upon our liquidation, dissolution or winding-up, the holders of common stock are entitled to share ratably in all assets remaining after payment of all liabilities and the liquidation preferences of any outstanding preferred stock. Holders of common stock have no preemptive or conversion rights or other subscription rights. There are no redemption or sinking fund provisions applicable to our common stock.

Preferred Stock

Upon the completion of this offering, our board of directors will have the authority, without further action by our stockholders, to issue from time to time up to 15,000,000 shares of preferred stock in one or more series, and to establish the number of shares to be included in each series and fix the powers, preferences and rights of the shares of each wholly unissued series and any of its qualifications, limitations or restrictions. Our board of directors will also be able to increase or decrease the number of shares of any series, but not below the number of shares of that series then outstanding, without any further vote or action by the stockholders.

The issuance of preferred stock could decrease the amount of earnings and assets available for distribution to the holders of common stock or adversely affect the rights and powers, including voting rights, of the holders of common stock. The issuance of preferred stock, while providing flexibility in connection with possible acquisitions and other corporate purposes, could, among other things, have the effect of delaying, deferring or preventing a change in control of our company, which could depress the market price of our common stock. We have no current plans to issue any shares of preferred stock.

Options

As of September 30, 2014, options to purchase 925,940 shares of our common stock were outstanding under our 2007 Stock Plan and 2010 Stock Plan, collectively, of which 278,828 were vested and 647,112 were unvested as of that date.

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Convertible Notes

In July 2012, January 2013, October 2013 and March 2014, we issued convertible notes to the holders and in the amounts set forth on the table in the section entitled “Related Party Transactions — Convertible Notes.” The notes accrue interest at a rate of 8% per annum compounded annually. In connection with this offering, the notes provide that the principal and accrued interest due on each note will, at the election of the holders of a majority in interest of the aggregate principal amount of all notes, be either due and payable in full or converted into shares of Series B convertible preferred stock at a price per share of $14.50 prior to closing. All convertible notes will be converted ultimately into shares of common stock in connection with the completion of this offering.

Warrants

In July 2012, January 2013, October 2013 and March 2014, we issued warrants to the holders and in the amounts set forth on the table in the section entitled “Related Party Transactions — Warrants”. The warrants were issued to investors in connection with the issuance of convertible notes and are exercisable for shares of Series B preferred stock pursuant to their terms. The warrants provide that in connection with this offering, the warrants will become exercisable for shares of Series B convertible preferred stock at an exercise price of $14.50 per share prior to closing. We have entered into an agreement with each of these warrant holders whereby they will net exercise the warrants effective and contingent upon the completion of this offering.

In November 2011, in connection with the closing of a debt facility, we issued a warrant to Square 1 Bank, which warrant was immediately exercisable for an aggregate of 8,275 shares of our Series B convertible preferred stock, at an exercise price of $14.50 per share. This warrant will expire in November 2018.

In June 2014, in connection with the entry into the Oxford term loan, we issued warrants to Oxford, exercisable for an aggregate of 36,207 shares of our Series B convertible preferred stock, at an exercise price of $14.50 per share which will become exercisable for shares of our common stock at the same price upon completion of this offering. The warrants will expire in June 2021.

Registration Rights

After the completion of this offering, holders of shares of our common stock will be entitled to rights with respect to the registration of those shares under the Securities Act. Under the terms of the investors’ rights agreement between us and the holders of these registrable securities, if we propose to register any of our securities under the Securities Act, either for our own account or for the account of other security holders exercising registration rights, these holders are entitled to notice of registration and are entitled to include their shares of common stock in the registration. The holders of these registrable securities are also entitled to specified demand registration rights under which they may require us to file a registration statement under the Securities Act at our expense with respect to our shares of common stock, and we are required to use our commercially reasonable efforts to effect this registration. Further, the holders of these registrable securities may require us to file additional registration statements on Form S-3. All of these registration rights are subject to conditions and limitations, among them the right of the underwriters of an offering to limit the number of shares included in the registration and our right not to effect a requested registration within six months following the completion of this offering.

All of our existing principal investors and their affiliated entities have indicated an interest in purchasing an aggregate of approximately $ million of shares of common stock in this offering at the initial public offering price. Certain of these investors would have the registration rights described below with respect to any of these shares that they purchase. However, because indications of interest are not binding agreements or commitments to purchase, the underwriters could determine to sell more, less or no shares to any of these investors and their affiliates and any of these investors and their affiliates could determine to purchase more, less or no shares in this offering, and the previous paragraph does not reflect any potential purchases by these investors or their affiliated entities.

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Anti-takeover Effects of Delaware Law and Our Restated Certificate of Incorporation and Bylaws

Certain provisions of Delaware law, our amended and restated certificate of incorporation and our amended and restated bylaws to become effective upon completion of this offering could have the effect of delaying, deferring or discouraging another party from acquiring control of us. These provisions, which are summarized below, are expected to discourage certain types of coercive takeover practices and inadequate takeover bids. These provisions are also designed, in part, to encourage persons seeking to acquire control of us to first negotiate with our board of directors. We believe that the benefits of increased protection of our potential ability to negotiate with an unfriendly or unsolicited acquirer outweigh the disadvantages of discouraging such proposals, including proposals that are priced above the then-current market value of our common stock, because, among other reasons, the negotiation of such proposals could result in an improvement of their terms.

Certificate of Incorporation and Bylaws

Our amended and restated certificate of incorporation and amended and restated bylaws to become effective upon completion of this offering will include provisions that:

•

authorize our board of directors to issue, without further action by the stockholders, up to shares of undesignated preferred stock;

•

require that any action to be taken by our stockholders be effected at a duly called annual or special meeting and not by written consent;

•

specify that special meetings of our stockholders can be called only by our board of directors, our chairman of the board, or our chief executive officer;

•

establish an advance notice procedure for stockholder approvals to be brought before an annual meeting of our stockholders, including proposed nominations of persons for election to our board of directors;

•

establish that our board of directors is divided into three classes, Class I, Class II and Class III, with each class serving staggered terms;

•

provide that our directors may be removed only for cause;

•

provide that vacancies on our board of directors may, except as otherwise required by law, be filled only by a majority of directors then in office, even if less than a quorum;

•

specify that no stockholder is permitted to cumulate votes at any election of directors; and

•

require a super-majority of votes to amend certain of the above-mentioned provisions.

Delaware Law

Upon the completion of this offering, we will be governed by the provisions of Section 203 of the Delaware General Corporation Law regulating corporate takeovers. This section prevents some Delaware corporations from engaging, under some circumstances, in a business combination, which includes a merger or sale of at least 10% of the corporation’s assets with any interested stockholder, meaning a stockholder who, together with affiliates and associates, owns or, within three years prior to the determination of interested stockholder status, did own 15% or more of the corporation’s outstanding voting stock, unless:

•

the transaction is approved by the board of directors prior to the time that the interested stockholder became an interested stockholder; or

•

subsequent to such time that the stockholder became an interested stockholder the business combination is approved by the board of directors and authorized at an annual or special meeting of stockholders by at least two-thirds of the outstanding voting stock which is not owned by the interested stockholder.

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A Delaware corporation may “opt out” of these provisions with an express provision in its original certificate of incorporation or an express provision in its certificate of incorporation or amended and restated bylaws resulting from a stockholders’ amendment approved by at least a majority of the outstanding voting shares. We have not opted out of these provisions. As a result, mergers or other takeover or change in control attempts of us may be discouraged or prevented.

In general, Section 203 defines an interested stockholder as any entity or person beneficially owning 15% or more of the outstanding voting stock of the corporation and any entity or person affiliated with or controlling or controlled by any of these entities or persons.

Transfer Agent and Registrar

The transfer agent and registrar for our common stock is Computershare Trust Company, N.A. The transfer agent’s address is 250 Royall Street, Canton, Massachusetts 02021 and its telephone number is (800) 662-7232.

Listing

Our common stock has been approved for listing on The NASDAQ Global Market under the symbol “TBRA”.

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SHARES ELIGIBLE FOR FUTURE SALE

Before this offering, there has not been a public market for shares of our common stock. Future sales of substantial amounts of shares of our common stock, including shares issued upon the exercise of outstanding options, in the public market after this offering, or the possibility of these sales occurring, could cause the market price for our common stock to fall or impair our ability to raise equity capital in the future.

Upon the completion of this offering and after giving effect to the Transactions, a total of shares of common stock will be outstanding. Of these shares, all shares of common stock sold in this offering, and any shares sold upon exercise of the underwriters’ option, will be freely tradable in the public market without restriction or further registration under the Securities Act of 1933, unless these shares are held by our “affiliates,” as that term is defined in Rule 144 under the Securities Act.

The remaining shares of common stock will be “restricted securities,” as that term is defined in Rule 144. These restricted securities are eligible for public sale only if they are registered under the Securities Act or if they qualify for an exemption from, or are not subject to, registration under the Securities Act.

Rule 144

In general, under Rule 144, beginning 90 days after the date of this prospectus, a person who is not deemed to be our affiliate and has not been our affiliate at any time during the three months preceding a sale will be entitled to sell any shares of our common stock that such person has beneficially owned for at least six months, including the holding period of any prior owner other than one of our affiliates, without regard to manner of sale, volume limitations or notice provisions of Rule 144. Sales of our common stock by any such person would be subject to the availability of current public information about us if the shares to be sold were beneficially owned by such person, including the holding period of any prior owner other than one of our affiliates, for less than one year.

In addition, under Rule 144, a person may sell shares of our common stock immediately upon the closing of this offering, without regard to volume limitations or the availability of public information about us, if:

•

the person is not our affiliate and has not been our affiliate at any time during the preceding three months; and

•

the person has beneficially owned the shares to be sold for at least one year, including the holding period of any prior owner other than one of our affiliates.

Beginning 90 days after the date of this prospectus, our affiliates who have beneficially owned shares of our common stock for at least six months would be entitled to sell within any three-month period a number of shares that does not exceed the greater of:

•

1% of the number of shares of our common stock then-outstanding, which will equal approximately shares immediately after this offering; and

•

the average weekly trading volume in our common stock during the four calendar weeks preceding the date of filing of a notice on Form 144 with respect to the sale.

Sales under Rule 144 by our affiliates or persons selling shares on behalf of our affiliates are also subject to manner of sale provisions and notice requirements and to the availability of current public information about us.

Rule 701

In general, under Rule 701, any of our employees, consultants or advisors who purchase shares from us in connection with a compensatory stock or option plan or other written agreement in a transaction before the date

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of this offering that was completed in reliance on Rule 701 and complied with the requirements of Rule 701 will, subject to the lock-up restrictions described below, be eligible to resell such shares 90 days after the date of this offering in reliance on Rule 144, but without compliance with certain restrictions, including the holding period, contained in Rule 144.

Lock-up Agreements

In connection with this offering, we and our executive officers, directors and substantially all of our stockholders immediately prior to this offering have agreed, subject to certain exceptions, not to engage in sales or dispositions of, or other transactions relating to, our common stock or securities convertible into or exercisable or exchangeable for our common stock or warrants or other rights to acquire shares of our common stock. These “lock-up” restrictions end 180 days after the date of this prospectus. However, Leerink Partners LLC may permit persons who are subject to these lock-up agreements to sell shares prior to the expiration of the lock-up agreements.

Registration Rights

After this offering, the holders of shares of common stock will be entitled to rights to cause us to register the sale of those shares under the Securities Act. Registration of these shares under the Securities Act would result in these shares, other than shares purchased by our affiliates, becoming fully tradable without restriction under the Securities Act immediately upon the effectiveness of the registration. See “Description of Capital Stock—Registration Rights” for additional information.

Stock Plans

We intend to file a registration statement on Form S-8 under the Securities Act covering all of the shares of common stock subject to options outstanding or reserved for issuance under our stock plans. We expect to file this registration statement as soon as practicable after this offering. However, none of the shares registered on Form S-8 will be eligible for resale until the expiration of the lock-up agreements to which they are subject.

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MATERIAL UNITED STATES TAX CONSIDERATIONS TO NON-U.S. HOLDERS

The following is a discussion of the material U.S. federal income tax considerations with respect to the ownership and disposition of shares of common stock applicable to non-U.S. holders who acquire such shares in this offering and hold such shares as a capital asset within the meaning of Section 1221 of the Internal Revenue Code of 1986, as amended (the “Code”) (generally, property held for investment). For purposes of this discussion, a “non-U.S. holder” means a beneficial owner of our common stock (other than an entity or arrangement that is treated as a partnership for U.S. federal income tax purposes) that is not, for U.S. federal income tax purposes, any of the following:

•

a citizen or resident of the United States;

•

a corporation (or other entity treated as a corporation for U.S. federal income tax purposes) created or organized in the United States or under the laws of the United States, any state thereof or the District of Columbia, or any other corporation treated as such;

•

an estate, the income of which is includable in gross income for U.S. federal income tax purposes regardless of its source; or

•

a trust if (i) a court within the United States is able to exercise primary supervision over the administration of the trust and one or more “U.S. persons,” as defined under the Code, have the authority to control all substantial decisions of the trust or (ii) such trust has made a valid election to be treated as a U.S. person for U.S. federal income tax purposes.

This discussion is based on current provisions of the Code, Treasury regulations promulgated thereunder, judicial opinions, published positions of the Internal Revenue Service and other applicable authorities, all of which are subject to change (possibly with retroactive effect). This discussion does not address all aspects of U.S. federal income taxation that may be important to a particular non-U.S. holder in light of that non-U.S. holder’s individual circumstances, nor does it address any aspects of the unearned income Medicare contribution tax pursuant to the Health Care and Education Reconciliation Act of 2010, any U.S. federal estate and gift taxes, any U.S. alternative minimum taxes or any state, local or non-U.S. taxes. This discussion may not apply, in whole or in part, to particular non-U.S. holders in light of their individual circumstances or to holders subject to special treatment under the U.S. federal income tax laws (such as insurance companies; tax-exempt organizations; financial institutions; brokers or dealers in securities; “controlled foreign corporations”; “passive foreign investment companies”; real estate investment trusts or regulated investment companies; non-U.S. holders that hold our common stock as part of a straddle, hedge, conversion transaction or other integrated investment; certain U.S. expatriates; persons deemed to sell our common stock under the constructive sale provisions of the Code; persons who hold or receive our common stock pursuant to the exercise of any employee stock option or otherwise as compensation; and tax-qualified retirement plans).

If a partnership (or other entity or arrangement treated as a partnership for U.S. federal income tax purposes) holds our common stock, the tax treatment of a partner therein will generally depend on the status of the partner and the activities of the partnership. Partners of a partnership holding our common stock should consult their tax advisor as to the particular U.S. federal income tax consequences applicable to them.

THIS SUMMARY IS FOR GENERAL INFORMATION ONLY AND IS NOT INTENDED TO CONSTITUTE A COMPLETE DESCRIPTION OF ALL TAX CONSEQUENCES FOR NON-U.S. HOLDERS RELATING TO THE OWNERSHIP AND DISPOSITION OF OUR COMMON STOCK. PROSPECTIVE HOLDERS OF OUR COMMON STOCK SHOULD CONSULT WITH THEIR TAX ADVISORS REGARDING THE TAX CONSEQUENCES TO THEM (INCLUDING THE APPLICATION AND EFFECT OF ANY STATE, LOCAL, FOREIGN INCOME AND OTHER TAX LAWS) OF THE OWNERSHIP AND DISPOSITION OF OUR COMMON STOCK.

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Dividends

In general, the gross amount of any distribution we make to a non-U.S. holder with respect to its shares of common stock will be subject to U.S. withholding tax at a rate of 30% to the extent the distribution constitutes a dividend for U.S. federal income tax purposes, unless the non-U.S. holder is eligible for a reduced rate of withholding tax under an applicable tax treaty and the non-U.S. holder provides proper certification of its eligibility for such reduced rate. A distribution will constitute a dividend for U.S. federal income tax purposes to the extent of our current or accumulated earnings and profits as determined for U.S. federal income tax purposes. To the extent any distribution does not constitute a dividend, it will be treated first as reducing the adjusted basis in the non-U.S. holder’s shares of common stock and then, to the extent it exceeds the adjusted basis in the non-U.S. holder’s shares of common stock, as gain from the sale or exchange of such stock. Any such gain will be subject to the treatment described below under “—Gain on Sale or Other Disposition of Common Stock.”

Dividends we pay to a non-U.S. holder that are effectively connected with its conduct of a trade or business within the United States (and, if required by an applicable tax treaty, are attributable to a U.S. permanent establishment of such non-U.S. holder) will not be subject to U.S. withholding tax, as described above, if the non-U.S. holder complies with applicable certification and disclosure requirements. Instead, such dividends generally will be subject to U.S. federal income tax on a net income basis, at regular U.S. federal income tax rates. Dividends received by a foreign corporation that are effectively connected with its conduct of trade or business within the United States may be subject to an additional branch profits tax at a rate of 30% (or such lower rate as may be specified by an applicable tax treaty).

Gain on Sale or Other Disposition of Common Stock

Subject to the discussion below on FATCA and backup withholding, a non-U.S. holder will not be subject to U.S. federal income tax on any gain realized upon the sale or other disposition of the non-U.S. holder’s shares of common stock unless:

•

the gain is effectively connected with a trade or business carried on by the non-U.S. holder within the United States (and, if required by an applicable tax treaty, is attributable to a U.S. permanent establishment of such non-U.S. holder);

•

the non-U.S. holder is an individual and is present in the United States for 183 days or more in the taxable year of disposition and certain other conditions are met; or

•

we are or have been a U.S. real property holding corporation (“USRPHC”) for U.S. federal income tax purposes at any time within the shorter of the five-year period preceding such disposition or such non-U.S. holder’s holding period of our common stock, and the non-U.S. holder has held, at any time during said period, more than 5% of the class of our stock being sold.

Gain that is effectively connected with the conduct of a trade or business in the United States (or so treated) generally will be subject to U.S. federal income tax on a net income tax basis, at regular U.S. federal income tax rates. If the non-U.S. holder is a foreign corporation, the branch profits tax described above also may apply to such effectively connected gain.

An individual non-U.S. holder who is subject to U.S. federal income tax because the non-U.S. holder was present in the United States for 183 days or more during the year of sale or other disposition of our common stock will be subject to a flat 30% tax on the gain derived from such sale or other disposition, which may be offset by U.S. source capital losses provided the non-U.S. holder timely files U.S. federal income tax returns with respect to such losses.

We believe that we are not and we do not anticipate becoming a U.S. real property holding corporation for U.S. federal income tax purposes. Because the determination of whether we are a USRPHC depends on the fair market value of our U.S. real property interests relative to the fair market value of our other business assets and our non-U.S. real property interests, however, there can be no assurance we are not a USRPHC or will not become one in the future. Even if we are or were to become a USRPHC, gain arising from the sale or other

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taxable disposition by a non-U.S. holder of our common stock will not be subject to U.S. federal income tax if such class of stock is “regularly traded,” as defined by applicable Treasury Regulations, on an established securities market, and such non-U.S. holder owned, actually or constructively, 5% or less of such class of our stock throughout the shorter of the five-year period ending on the date of the sale or other disposition or the non-U.S. holder’s holding period for such stock.

Withholdable Payments to Foreign Financial Entities and Other Foreign Entities

The Foreign Account Tax Compliance Act, or FATCA, will impose a U.S. federal withholding tax of 30% on certain payments to foreign financial institutions, investment funds and certain other non-U.S. persons that fail to comply with certain information reporting and certification requirements pertaining to their direct and indirect U.S. securityholders and/or U.S. accountholders. Such payments would include our dividends and the gross proceeds from the sale or other disposition of our common stock. Under recently issued final Treasury Regulations and subsequent IRS guidance, this withholding will apply to payments of dividends on our common stock made on or after July 1, 2014 and to payments of gross proceeds from a sale or other disposition of our common stock made on or after January 1, 2017. Because we may not know the extent to which a distribution is a dividend for U.S. federal income tax purposes at the time it is made, for purposes of these withholding rules we may treat the entire distribution as a dividend. Prospective investors are encouraged to consult with their own tax advisors regarding the possible implications of this legislation on their investment in our common stock.

Backup Withholding, Information Reporting and Other Reporting Requirements

We must report annually to the Internal Revenue Service and to each non-U.S. holder the amount of dividends paid to, and the tax withheld with respect to, each non-U.S. holder. These reporting requirements apply regardless of whether withholding was reduced or eliminated by an applicable tax treaty. Copies of this information reporting may also be made available under the provisions of a specific tax treaty or agreement with the tax authorities in the country in which the non-U.S. holder resides or is established.

A non-U.S. holder will generally be subject to backup withholding for dividends on our common stock paid to such holder unless such holder certifies under penalties of perjury that, among other things, it is a non-U.S. holder, such as by providing a valid IRS Form W-8BEN or W-8ECI, or other applicable certification (and the payor does not have actual knowledge or reason to know that such holder is a U.S. person) or otherwise establishes an exemption.

Information reporting and backup withholding generally are not required with respect to the amount of any proceeds from the sale or other disposition of our common stock by a non-U.S. holder outside the United States through a foreign office of a foreign broker that does not have certain specified connections to the United States. However, if a non-U.S. holder sells or otherwise disposes of its shares of common stock through a U.S. broker or the U.S. offices of a foreign broker, the broker will generally be required to report the amount of proceeds paid to the non-U.S. holder to the Internal Revenue Service and also backup withhold on that amount unless such non-U.S. holder provides appropriate certification to the broker of its status as a non-U.S. person, such as by providing a valid IRS Form W-8BEN or W-8ECI, or other applicable certification (and the payor does not have actual knowledge or reason to know that such holder is a U.S. person) or otherwise establishes an exemption. Information reporting will also apply if a non-U.S. holder sells its shares of common stock through a foreign broker deriving more than a specified percentage of its income from U.S. sources or having certain other connections to the United States, unless such broker has documentary evidence in its records that such non-U.S. holder is a non-U.S. person (and the payor does not have actual knowledge or reason to know that such holder is a U.S. person) and certain other conditions are met, or such non-U.S. holder otherwise establishes an exemption.

Backup withholding is not an additional income tax. Any amounts withheld under the backup withholding rules from a payment to a non-U.S. holder generally can be credited against the non-U.S. holder’s U.S. federal income tax liability, if any, or refunded, provided that the required information is furnished to the Internal Revenue Service in a timely manner. Non-U.S. holders should consult their tax advisors regarding the application of the information reporting and backup withholding rules to them.

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UNDERWRITING

Leerink Partners LLC is acting as representative of each of the underwriters named below. Subject to the terms and conditions set forth in an underwriting agreement among us and the underwriters, we have agreed to sell to the underwriters, and each of the underwriters has agreed, severally and not jointly, to purchase from us, the number of shares of common stock set forth opposite its name below.


Underwriter		Number of Shares
Leerink Partners LLC
Oppenheimer & Co. Inc.
Needham & Company, LLC

Total:

Subject to the terms and conditions set forth in the underwriting agreement, the underwriters have agreed, severally and not jointly, to purchase all of the shares sold under the underwriting agreement if any of these shares are purchased. If an underwriter defaults, the underwriting agreement provides that the purchase commitments of the non-defaulting underwriters may be increased or the underwriting agreement may be terminated.

We have agreed to indemnify the underwriters against certain liabilities, including liabilities under the Securities Act, or to contribute to payments the underwriters may be required to make in respect of those liabilities.

The underwriters are offering the shares, subject to prior sale, when, as and if issued to and accepted by them, subject to approval of legal matters by their counsel, including the validity of the shares, and other conditions contained in the underwriting agreement, such as the receipt by the underwriters of officers’ certificates and legal opinions. The underwriters reserve the right to withdraw, cancel or modify offers to the public and to reject orders in whole or in part.

Commissions and Discounts

The representative has advised us that the underwriters propose initially to offer the shares to the public at the public offering price set forth on the cover of this prospectus and to dealers at that price less a concession not in excess of $ per share. After the initial offering, the public offering price, concession or any other term of the offering may be changed.

The following table shows the public offering price, underwriting discount and proceeds before expenses to us. The information assumes either no exercise or full exercise by the underwriters of their option to purchase additional shares of our common stock.

Per Share

Without
Option

With
Option

Public offering price

Underwriting discount

Proceeds, before expenses, to us

We estimate expenses payable by us in connection with this offering, other than the underwriting discounts and commissions referred to above, will be approximately $ . We also have agreed to reimburse the underwriters for up to $ for their FINRA counsel fee. In accordance with FINRA Rule 5110, this reimbursed fee is deemed underwriting compensation for this offering.

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Option to Purchase Additional Shares

We have granted an option to the underwriters, exercisable for 30 days after the date of this prospectus, to purchase up to additional shares at the public offering price, less the underwriting discount. If the underwriters exercise this option, each will be obligated, subject to conditions contained in the underwriting agreement, to purchase a number of additional shares proportionate to that underwriter’s initial amount reflected in the above table.

No Sales of Similar Securities

We, our executive officers and directors and all of our other existing security holders have agreed not to sell or transfer any common stock or securities convertible into or exchangeable or exercisable for common stock, for 180 days after the date of this prospectus without first obtaining the written consent of Leerink Partners LLC. Specifically, we and these other persons have agreed, with certain limited exceptions, not to directly or indirectly:

•

offer, pledge, sell or contract to sell any common stock;

•

sell any option or contract to purchase any common stock;

•

purchase any option or contract to sell any common stock;

•

grant any option, right or warrant for the sale of any common stock;

•

otherwise transfer or dispose of any common stock;

•

exercise any right with respect to registration of any common stock, or file or cause to be filed any registration statement in connection therewith; or

•

enter into any swap or any other agreement or any transaction that transfers, in whole or in part, the economic consequence of ownership of any common stock, whether any such swap or transaction is to be settled by delivery of shares or other securities, in cash or otherwise.

This lock-up provision applies to common stock and to securities convertible into or exchangeable or exercisable for common stock. It also applies to common stock owned now or acquired later by the person executing the agreement or for which the person executing the agreement later acquires the power of disposition.

NASDAQ Global Market Listing

We have applied to list our common stock on The NASDAQ Global Market under the symbol “TBRA.”

Before this offering, there has been no public market for our common stock. The initial public offering price will be determined through negotiations between us and the representatives. In addition to prevailing market conditions, the factors to be considered in determining the initial public offering price are:

•

the valuation multiples of publicly traded companies that the representatives believe to be comparable to us;

•

our financial information;

•

the history of, and the prospects for, our company and the industry in which we compete;

•

an assessment of our management, its past and present operations, and the prospects for, and timing of, our future revenues;

•

the present state of our development; and

•

the above factors in relation to market values and various valuation measures of other companies engaged in activities similar to ours.

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An active trading market for the shares may not develop. It is also possible that after the offering the shares will not trade in the public market at or above the initial public offering price.

The underwriters do not expect to sell more than 5% of the shares in the aggregate to accounts over which they exercise discretionary authority.

Price Stabilization, Short Positions and Penalty Bids

Until the distribution of the shares is completed, SEC rules may limit underwriters and selling group members from bidding for and purchasing our common stock. However, the representatives may engage in transactions that stabilize the price of the common stock, such as bids or purchases to peg, fix or maintain that price.

In connection with the offering, the underwriters may purchase and sell our common stock in the open market. These transactions may include short sales, purchases on the open market to cover positions created by short sales and stabilizing transactions. Short sales involve the sale by the underwriters of a greater number of shares than they are required to purchase in the offering. “Covered” short sales are sales made in an amount not greater than the underwriters’ option to purchase additional shares described above. The underwriters may close out any covered short position by either exercising their option to purchase additional shares or purchasing shares in the open market. In determining the source of shares to close out the covered short position, the underwriters will consider, among other things, the price of shares available for purchase in the open market as compared to the price at which they may purchase shares through the option granted to them. “Naked” short sales are sales in excess of such option. The underwriters must close out any naked short position by purchasing shares in the open market. A naked short position is more likely to be created if the underwriters are concerned that there may be downward pressure on the price of our common stock in the open market after pricing that could adversely affect investors who purchase in the offering. Stabilizing transactions consist of various bids for or purchases of shares of common stock made by the underwriters in the open market prior to the closing of the offering.

The underwriters may also impose a penalty bid. This occurs when a particular underwriter repays to the underwriters a portion of the underwriting discount received by it because the representatives have repurchased shares sold by or for the account of such underwriter in stabilizing or short covering transactions.

Similar to other purchase transactions, the underwriters’ purchases to cover the syndicate short sales may have the effect of raising or maintaining the market price of our common stock or preventing or retarding a decline in the market price of our common stock. As a result, the price of our common stock may be higher than the price that might otherwise exist in the open market. The underwriters may conduct these transactions on The NASDAQ Global Market, in the over-the-counter market or otherwise.

Neither we nor any of the underwriters make any representation or prediction as to the direction or magnitude of any effect that the transactions described above may have on the price of our common stock. In addition, neither we nor any of the underwriters make any representation that the representatives will engage in these transactions or that these transactions, once commenced, will not be discontinued without notice.

Electronic Offer, Sale and Distribution of Shares

A prospectus supplement and prospectus in electronic format may be made available on the websites maintained by one or more underwriters, if any, participating in the offering. The underwriters may agree to allocate a number of shares to underwriters for sale to their online brokerage account holders. Internet distributions will be allocated by the representatives to underwriters that may make Internet distributions on the same basis as other allocations. Other than the prospectus supplement and prospectus in electronic format, the information on the underwriters’ websites and any information contained in any other website maintained by the underwriters is not part of this prospectus supplement and the accompanying prospectus or the registration statement of which they form a part.

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Other Relationships

Some of the underwriters and their affiliates may in the future engage in investment banking and other commercial dealings in the ordinary course of business with us or our affiliates. They may in the future receive customary fees and commissions for these transactions.

In addition, in the ordinary course of their business activities, the underwriters and their affiliates may make or hold a broad array of investments and actively trade debt and equity securities (or related derivative securities) and financial instruments (including bank loans) for their own account and for the accounts of their customers.

Such investments and securities activities may involve securities and/or instruments of ours or our affiliates. The underwriters and their affiliates may also make investment recommendations and/or publish or express independent research views in respect of such securities or financial instruments and may hold, or recommend to clients that they acquire, long and/or short positions in such securities and instruments.

Notice to Prospective Investors in the European Economic Area

In relation to each Member State of the European Economic Area (each, a “Relevant Member State”), no offer of shares may be made to the public in that Relevant Member State other than:

to any legal entity which is a qualified investor as defined in the Prospectus Directive;

to fewer than 100 or, if the Relevant Member State has implemented the relevant provision of the 2010 PD Amending Directive, 150, natural or legal persons (other than qualified investors as defined in the Prospectus Directive), as permitted under the Prospectus Directive, subject to obtaining the prior consent of the representatives; or

in any other circumstances falling within Article 3(2) of the Prospectus Directive, provided that no such offer of shares shall require us or our representatives to publish a prospectus pursuant to Article 3 of the Prospectus Directive or supplement a prospectus pursuant to Article 16 of the Prospectus Directive.

Each person in a Relevant Member State who initially acquires any shares or to whom any offer is made will be deemed to have represented, acknowledged and agreed that it is a “qualified investor” within the meaning of the law in that Relevant Member State implementing Article 2(1)(e) of the Prospectus Directive. In the case of any shares being offered to a financial intermediary as that term is used in Article 3(2) of the Prospectus Directive, each such financial intermediary will be deemed to have represented, acknowledged and agreed that the shares acquired by it in the offer have not been acquired on a non-discretionary basis on behalf of, nor have they been acquired with a view to their offer or resale to, persons in circumstances which may give rise to an offer of any shares to the public other than their offer or resale in a Relevant Member State to qualified investors as so defined or in circumstances in which the prior consent of the representatives has been obtained to each such proposed offer or resale.

We, our representatives and our affiliates will rely upon the truth and accuracy of the foregoing representations, acknowledgements and agreements.

This prospectus has been prepared on the basis that any offer of shares in any Relevant Member State will be made pursuant to an exemption under the Prospectus Directive from the requirement to publish a prospectus for offers of shares. Accordingly any person making or intending to make an offer in that Relevant Member State of shares which are the subject of the offering contemplated in this prospectus may only do so in circumstances in which no obligation arises for us or any of the underwriters to publish a prospectus pursuant to Article 3 of the Prospectus Directive in relation to such offer. Neither we nor the underwriters have authorized, nor do they authorize, the making of any offer of shares in circumstances in which an obligation arises for us or the underwriters to publish a prospectus for such offer.

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For the purpose of the above provisions, the expression “an offer to the public” in relation to any shares in any Relevant Member State means the communication in any form and by any means of sufficient information on the terms of the offer and the shares to be offered so as to enable an investor to decide to purchase or subscribe the shares, as the same may be varied in the Relevant Member State by any measure implementing the Prospectus Directive in the Relevant Member State and the expression “Prospectus Directive” means Directive 2003/71/EC (including the 2010 PD Amending Directive, to the extent implemented in the Relevant Member States) and includes any relevant implementing measure in the Relevant Member State and the expression “2010 PD Amending Directive” means Directive 2010/73/EU.

Notice to Prospective Investors in the United Kingdom

This prospectus is only being distributed to, and is only directed at, persons in the United Kingdom that are qualified investors within the meaning of Article 2(1)(e) of the Prospectus Directive that are also (i) investment professionals falling within Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (the Order) or (ii) high net worth entities, and other persons to whom it may lawfully be communicated, falling within Article 49(2)(a) to (d) of the Order (each such person being referred to as a “relevant person”). This prospectus and its contents are confidential and should not be distributed, published or reproduced (in whole or in part) or disclosed by recipients to any other persons in the United Kingdom. Any person in the United Kingdom that is not a relevant person should not act or rely on this document or any of its contents.

Notice to Prospective Investors in Israel

In the State of Israel, the ordinary shares offered hereby may not be offered to any person or entity other than the following:

(a) a fund for joint investments in trust (i.e., mutual fund), as such term is defined in the Law for Joint Investments in Trust, 5754-1994, or a management company of such a fund;

(b) a provident fund as defined in Section 47(a)(2) of the Income Tax Ordinance of the State of Israel, or a management company of such a fund;

(c) an insurer, as defined in the Law for Oversight of Insurance Transactions, 5741-1981, (d) a banking entity or satellite entity, as such terms are defined in the Banking Law (Licensing), 5741-1981, other than a joint services company, acting for their own account or for the account of investors of the type listed in Section 15A(b) of the Securities Law 1968;

(d) a company that is licensed as a portfolio manager, as such term is defined in Section 8(b) of the Law for the Regulation of Investment Advisors and Portfolio Managers, 5755-1995, acting on its own account or for the account of investors of the type listed in Section 15A(b) of the Securities Law 1968;

(e) a company that is licensed as an investment advisor, as such term is defined in Section 7(c) of the Law for the Regulation of Investment Advisors and Portfolio Managers, 5755-1995, acting on its own account;

(f) a company that is a member of the Tel Aviv Stock Exchange, acting on its own account or for the account of investors of the type listed in Section 15A(b) of the Securities Law 1968;

(g) an underwriter fulfilling the conditions of Section 56(c) of the Securities Law, 5728-1968;

(h) a venture capital fund (defined as an entity primarily involved in investments in companies which, at the time of investment, are primarily engaged in research and development or manufacture of new technological products or processes and (ii) involve above-average risk);

(i) an entity primarily engaged in capital markets activities in which all of the equity owners meet one or more of the above criteria; and

(j) an entity, other than an entity formed for the purpose of purchasing ordinary shares in this offering, in which the shareholders equity (including pursuant to foreign accounting rules, international accounting regulations and U.S. generally accepted accounting rules, as defined in the Securities Law Regulations (Preparation of Annual Financial Statements), 1993) is in excess of NIS 50 million.

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LEGAL MATTERS

The validity of the shares of common stock offered by this prospectus will be passed upon for us by Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP, Redwood City, California. Certain legal matters in connection with this offering will be passed upon for the underwriters by Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C., Boston, Massachusetts.

EXPERTS

The financial statements of Tobira Therapeutics, Inc. as of December 31, 2012 and 2013 and for each of the two years in the period ended December 31, 2013 and the period from September 11, 2006 (inception) to December 31, 2013, appearing in this prospectus have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their report thereon (which contains an explanatory paragraph describing conditions that raise substantial doubt about the Company’s ability to continue as a going concern as described in Note 1 to Notes to Financial Statements) appearing elsewhere herein, and are included in reliance on such report given on the authority of such firm as experts in auditing and accounting.

WHERE YOU CAN FIND ADDITIONAL INFORMATION

We have filed with the Securities and Exchange Commission a registration statement on Form S-1 under the Securities Act with respect to the shares of common stock offered by this prospectus. This prospectus, which constitutes a part of the registration statement, does not contain all of the information set forth in the registration statement or the exhibits and schedules to the registration statement. Please refer to the registration statement, exhibits and schedules for further information with respect to the common stock offered by this prospectus. Statements contained in this prospectus regarding the contents of any contract or other document are only summaries. With respect to any contract or document that is filed as an exhibit to the registration statement, you should refer to the exhibit for a copy of the contract or document, and each statement in this prospectus regarding that contract or document is qualified by reference to the exhibit. You may read and copy the registration statement and its exhibits and schedules at the SEC’s public reference room, located at 100 F Street, N.E., Room 1580, Washington, D.C. You may obtain information on the operation of the public reference room by calling the SEC at 1-800-SEC-0330. The SEC also maintains a website that contains reports, proxy and information statements and other information regarding companies, such as ours, that file documents electronically with the SEC. The address of that website is www.sec.gov. The information on the SEC’s web site is not part of this prospectus, and any references to this web site or any other web site are inactive textual references only.

Upon completion of this offering, we will become subject to the information and reporting requirements of the Securities Exchange Act of 1934 and, in accordance with this law, will be required to file periodic reports, proxy statements and other information with the SEC. These periodic reports, proxy statements and other information will be available for inspection and copying at the SEC’s public reference facilities and the website of the SEC referred to above.

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TOBIRA THERAPEUTICS, INC.

Index to Financial Statements


Report of Independent Registered Public Accounting Firm			F-2

Balance Sheets			F-3

Statements of Operations and Comprehensive Loss			F-4

Statements of Convertible Preferred Stock and Stockholders’ Deficit			F-5

Statements of Cash Flows			F-7

Notes to Financial Statements			F-8

F-1

Report of Independent Registered Public Accounting Firm

Tobira Therapeutics, Inc.

The Board of Directors and Stockholders

We have audited the accompanying balance sheets of Tobira Therapeutics, Inc. (a development stage company) as of December 31, 2012 and 2013, and the related statements of operations and comprehensive loss, convertible preferred stock and stockholders’ deficit, and cash flows for the years then ended and for the period from September 11, 2006 (inception) to December 31, 2013. These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. We were not engaged to perform an audit of the Company’s internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the financial position of Tobira Therapeutics, Inc. at December 31, 2012 and 2013, and the results of its operations and its cash flows for the years then ended and for the period from September 11, 2006 (inception) to December 31, 2013, in conformity with U.S. generally accepted accounting principles.

The accompanying financial statements have been prepared assuming that the Company will continue as a going concern. As discussed in Note 1 to the financial statements, the Company has recurring net losses, a working capital deficit and a net capital deficiency at December 31, 2013, that raise substantial doubt about its ability to continue as a going concern. Management’s plans in regard to these matters are also described in Note 1. The financial statements do not include any adjustments that might result from the outcome of this uncertainty.

/s/ Ernst & Young LLP

Redwood City, California

May 5, 2014, except for the last paragraph of Note 1, as to which the date is July 28, 2014

F-2

TOBIRA THERAPEUTICS, INC.

(A Development Stage Company)

Balance Sheets

(In thousands, except share and per share data)


	December 31,				September 30,		Pro Forma Stockholders’ Equity September 30,
	2012		2013		2014		2014
					(unaudited)		(unaudited)
Assets
Current assets:
Cash and cash equivalents	$	10,940	$	4,088	$	11,808
Restricted cash		—		—		50
Prepaid expenses and other current assets		515		121		643

Total current assets		11,455		4,209		12,501
Property and equipment, net		36		19		454
Restricted cash		50		50		334
Deposits and other assets		6		—		3,902

Total assets	$	11,547	$	4,278	$	17,191


Liabilities, convertible preferred stock and stockholders’ deficit
Current liabilities:
Accounts payable	$	1,798	$	875	$	1,757
Accrued expenses and other liabilities		2,300		2,270		5,728	$	2,228
Stock award liability		—		—		295
Capital lease obligation		—		—		20
Deferred rent		—		—		59
Term loan		3,804		1,820		—
Convertible notes, related party		8,205		20,553		29,576		—

Total current liabilities		16,107		25,518		37,435
Capital lease obligation		—		—		49
Deferred rent		—		—		227
Term loan		—		—		14,714
Preferred stock warrant liabilities		2,475		2,773		2,233		—

Total liabilities		18,582		28,291		54,658
Commitments and contingencies
Series A, noncumulative convertible preferred stock, par value $0.0001; 27,542,369 shares authorized at December 31, 2012, 2013, and September 30, 2014 (unaudited); 994,866 issued and outstanding at December 31, 2012, 2013, and September 30, 2014 (unaudited); liquidation value of $31,000 at December 31, 2012, 2013, and September 30, 2014 (unaudited); and no shares authorized or outstanding pro forma at September 30, 2014 (unaudited)		30,908		30,908		30,908		—
Series B, noncumulative convertible preferred stock, par value $0.0001; 77,121,121, 114,557,631, and 135,557,631 shares authorized at December 31, 2012, 2013, and September 30, 2014 (unaudited), respectively; 2,151,722 issued and outstanding at December 31, 2012 and 2013 and September 30, 2014 (unaudited); liquidation value of $54,600 at December 31, 2012, 2013, and September 30, 2014 (unaudited); and no shares authorized or outstanding pro forma at September 30, 2014 (unaudited)		31,074		31,074		31,074		—
Stockholders’ (deficit) equity:
Common stock, par value $0.0001; 138,211,620, 202,317,000, and 223,317,000 shares authorized at December 31, 2012, 2013, and September 30, 2014 (unaudited), respectively; 268,060 shares issued and 267,682 outstanding, excluding 378 shares subject to repurchase at December, 31, 2012, 282,157 shares issued and outstanding at, December 31, 2013, and September 30, 2014 (unaudited) and 7,066,148 shares issued and outstanding, pro forma (unaudited)		—		—		—		1
Additional paid-in capital		2,054		3,665		3,897		101,286
Accumulated other comprehensive loss		—		—

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Smaller reporting company

Tobira Therapeutics, Inc. S-1/A