UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended ~~September~~March 3031, ~~2023~~2024

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number: 001-35409

Merrimack Pharmaceuticals, Inc.

(Exact name of registrant as specified in its charter)

    Delaware

    04-3210530

    (State or other jurisdiction of
incorporation or organization)

    (I.R.S. Employer
Identification Number)

    One Broadway, 14th Floor
Cambridge, MA

    02142

    (Address of principal executive offices)

    (Zip Code)

(617) 720-8606

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:


Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common stock, $0.01 par value	MACK	Nasdaq Global Market

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

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


Large accelerated filer	☐	Accelerated filer	☐
Non-accelerated filer	☒	Smaller reporting company	☒
Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

As of ~~October~~May 3113, ~~2023~~2024, there were 14,~~320~~788,~~953~~369 shares of Common Stock, $0.01 par value per share, outstanding.

TABLE OF CONTENTS

PART I

FINANCIAL INFORMATION

		Page
Item 1.	Financial Statements.	2
	Condensed Consolidated Balance Sheets – September 30, 2023 and December 31, 2022 (unaudited)	2
	Condensed Consolidated Balance Sheets – March 31, 2024 and December 31, 2023 (unaudited)	2
	Condensed Consolidated Statements of Operations and Comprehensive Loss – Three and Nine Months Ended September 30, 2023 and 2022 (unaudited)	3
	Condensed Consolidated Statements of Operations and Comprehensive Loss – Three Months Ended March 31, 2024 and 2023 (unaudited)	3
	Condensed Consolidated Statements of Stockholders’ Equity – Three and Nine Months Ended September 30, 2023 and 2022 (unaudited)	4
	Condensed Consolidated Statements of Stockholders’ Equity – Three Months Ended March 31, 2024 and 2023 (unaudited)	4
	Condensed Consolidated Statements of Cash Flows – Nine Months Ended September 30, 2023 and 2022 (unaudited)	5
	Condensed Consolidated Statements of Cash Flows – Three Months Ended March 31, 2024 and 2023 (unaudited)	5
	Notes to Condensed Consolidated Financial Statements (unaudited)	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations.	1112
Item 3.	Quantitative and Qualitative Disclosures About Market Risk.	17
Item 4.	Controls and Procedures.	17

PART II

OTHER INFORMATION


Item 1.	Legal Proceedings.	18

Item 1A.	Risk Factors.	18

Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds.	18

Item 3.	Defaults Upon Senior Securities.	18

Item 4.	Mine Safety Disclosures.	18

Item 5.	Other Information.	18

Item 6.	Exhibits.	19

Signatures		20

FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q contains forward-looking statements that involve substantial risks and uncertainties. All statements, other than statements of historical facts, contained in this Quarterly Report on Form 10-Q, including statements regarding our strategy, future operations, future financial position, future revenues, projected costs, prospects, plans and objectives of management, are forward-looking statements. The words “anticipate,” “believe,” “estimate,” “expect,” “intend,” “may,” “plan,” “predict,” “project,” “target,” “potential,” “will,” “would,” “could,” “should,” “continue” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words.

The forward-looking statements in this Quarterly Report on Form 10-Q include, among other things, statements about:

•

our rights to receive payments related to the accomplishment, if at all, of additional milestone ~~events~~(the “Ipsen mPDAC Milestone Payment”) under the asset purchase and sale agreement with Ipsen S.A.;

•

our rights to receive payments related to the milestone events under the asset purchase agreement with Elevation Oncology, Inc. (formerly known as 14ner Oncology, Inc.), when expected or at all;

•

our ~~cash~~estimates ~~runway~~regarding ~~and the sufficiency of our financial resources to fund our operations~~expenses; and

•

other risks detailed from time to time in our ~~estimates~~filings ~~regarding~~with ~~expenses;~~the Securities and Exchange Commission (the “SEC”), press releases and other communications, including those set forth under “Risk Factors” included in our Annual Report on Form 10-K for the year ended December 31, 2023, and in the documents incorporated by reference herein and therein.

our plans to seek to divest our remaining product candidate; and

other risks detailed from time to time in our filings with the Securities and Exchange Commission (the “SEC”), press releases and other communications, including those set forth under “Risk Factors” included in our Annual Report on Form 10-K for the year ended December 31, 2022, and in the documents incorporated by reference herein and therein.

We may not actually achieve the plans, intentions or expectations disclosed in our forward-looking statements, and you should not place undue reliance on our forward-looking statements. Actual results or events could differ materially from the plans, intentions and expectations disclosed in the forward-looking statements we make. Our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures, collaborations or investments that we may make.

You should read this Quarterly Report on Form 10-Q and the documents that we have filed as exhibits to this Quarterly Report on Form 10-Q completely and with the understanding that our actual future results may be materially different from what we expect. We do not assume any obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

NOTE REGARDING TRADEMARKS

ONIVYDE® is a trademark of Ipsen S.A. Any other trademarks, trade names and service marks referred to in this Quarterly Report on Form 10-Q are the property of their respective owners.

PART I

FINANCIAL INFORMATION

Item 1. Financial Statements.

Merrimack Pharmaceuticals, Inc.

Condensed Consolidated Balance Sheets

(unaudited)

(in thousands, except per share amounts)	~~September~~March 3031, ~~2023~~2024			December 31, ~~2022~~2023
Assets
Current assets:
Cash and cash equivalents	$	6234,~~083~~160		$	195,~~439~~989
Short-term investments		129,~~821~~950			—12,886
Prepaid expenses and other current assets		~~390~~209			~~389~~309
Total current assets		19244,~~294~~319			19,~~828~~184
Other assets		53			84
Total assets	$	19244,~~299~~322		$	19,~~836~~188
Liabilities and stockholders’ equity
Current liabilities:
Accounts payable, accrued expenses and other	$	~~493~~566		$	~~589~~441
Total current liabilities		493			589
Income taxes payable		22,106			—
Total liabilities		493			589
Total current liabilities		22,672			441
Total liabilities		22,672			441
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.01 par value: 10,000 shares authorized at September 30, 2023 and December 31, 2022; no shares issued or outstanding at September 30, 2023 or December 31, 2022		—			—
Preferred stock, $0.01 par value: 10,000 shares authorized at March 31, 2024 and December 31, 2023; no shares issued or outstanding at March 31, 2024 or December 31, 2023		—			—
Common stock, $0.01 par value: 30,000 shares authorized at September 30, 2023 and December 31, 2022; 14,321 and 14,215 shares issued and outstanding at September 30, 2023 and December 31, 2022, respectively		1,343			1,342
Common stock, $0.01 par value: 30,000 shares authorized at March 31, 2024 and December 31, 2023; 14,532 and 14,351 shares issued and outstanding at March 31, 2024 and December 31, 2023, respectively		1,345			1,343
Additional paid-in capital		~~566~~567,~~040~~752			~~565~~566,~~541~~221
Accumulated deficit		(~~548~~347,~~577~~447	)		(~~547~~548,~~636~~817	)
Total stockholders’ equity		18221,~~806~~650			1918,~~247~~747
Total liabilities and stockholders’ equity	$	19244,~~299~~322		$	19,~~836~~188

The accompanying notes are an integral part of these condensed consolidated financial statements.

Merrimack Pharmaceuticals, Inc.

Condensed Consolidated Statements of Operations and Comprehensive Loss

(unaudited)

	Three Months EndedSeptember 30,						Nine Months EndedSeptember 30,
	Three Months EndedMarch 31,
(in thousands, except per share amounts)	~~2023~~2024			~~2022~~2023			~~2023~~			~~2022~~
Operating expenses:
General and administrative expenses	$	~~531~~669		$	~~504~~586		$	~~1,686~~		$	~~1,567~~
Gain on sale of in-process research and development		—			—(139	)		~~(139~~	)		~~(445~~	)
Total operating expenses		~~531~~669			~~504~~447			~~1,547~~			~~1,122~~
Loss from operations		(~~531~~669	)		(~~504~~447	)		~~(1,547~~	)		~~(1,122~~	)
Other income:
Interest income		~~252~~233			62176			~~606~~			70
Total other income		~~252~~233			62176			~~606~~			70
Net loss and comprehensive loss	$	(279	)	$	(442	)	$	(941	)	$	(1,052	)
Net loss from continuing operations		(436	)	$	(271	)
Net loss per common share - basic and diluted	$	(0.02	)	$	(0.03	)	$	(0.07	)	$	(0.08	)
Discontinued operations:
Weighted-average common shares used to compute basic and diluted net loss per common share		14,321			13,410			14,289			13,410
Income from discontinued operations, net of tax		201,806			—
Net income (loss) and comprehensive income (loss)	$	201,370		$	(271	)
Basic and dilutive net income (loss) per common share
Net loss from continuing operations	$	(0.03	)	$	(0.02	)
Net income from discontinued operations, net of tax		13.96			—
Net income (loss) per common share	$	13.93		$	(0.02	)
Weighted-average common shares used to compute basic and diluted net income (loss) per common share		14,452			14,252

The accompanying notes are an integral part of these condensed consolidated financial statements.

Merrimack Pharmaceuticals, Inc.

Condensed Consolidated Statements of Stockholders’ Equity

(unaudited)

	Common Stock
(in thousands)	Shares		Amount		AdditionalPaid-InCapital		AccumulatedDeficit			TotalStockholders’Equity
Balance at December 31, 2022		14,215	$	1,342	$	565,541	$	(547,636	)	$	19,247
Balance at December 31, 2023		14,351	$	1,343	$	566,221	$	(548,817	)	$	18,747
Exercise of stock options		40181		12		~~178~~1,483		—			~~179~~1,485
Stock-based compensation		—		—		17		—			17
Net loss		—		—		—		(271	)		(271	)
Balance at March 31, 2023		14,255	$	1,343	$	565,736	$	(547,907	)	$	19,172
Exercise of stock options		66		—		209		—			209
Stock-based compensation		—		—		47		—			47
Net loss		—		—		—		(391	)		(391	)
Balance at June 30, 2023		14,321	$	1,343	$	565,992	$	(548,298	)	$	19,037
Stock-based compensation		—		—		48		—			48
Net loss		—		—		—		(279	)		(279	)
Net income		—		—		—		201,370			201,370
Balance at September 30, 2023		14,321	$	1,343	$	566,040	$	(548,577	)	$	18,806
Balance at March 31, 2024		14,532	$	1,345	$	567,752	$	(347,447	)	$	221,650

	Common Stock
(in thousands)	Shares		Amount		AdditionalPaid-InCapital		AccumulatedDeficit			TotalStockholders’Equity
Balance at December 31, 2021		13,410	$	1,334	$	558,945	$	(546,092	)	$	14,187
Balance at December 31, 2022		14,215	$	1,342	$	565,541	$	(547,636	)	$	19,247
Stock-based compensation		—		—		20		—			20
Exercise of stock options		40		1		178		—			179
Net loss		—		—		—		(132	)		(132	)
Balance at March 31, 2022		13,410	$	1,334	$	558,965	$	(546,224	)	$	14,075
Stock-based compensation		—		—		17		—			17
Net loss		—		—		—		(~~478~~271	)		(~~478~~271	)
Balance at June 30, 2022		13,410	$	1,334	$	558,982	$	(546,702	)	$	13,614
Balance at March 31, 2023		14,255	$	1,343	$	565,736	$	(547,907	)	$	19,172
Stock-based compensation		—		—		17		—			17
Net loss		—		—		—		(442	)		(442	)
Balance at September 30, 2022		13,410	$	1,334	$	558,999	$	(547,144	)	$	13,189

The accompanying notes are an integral part of these condensed consolidated financial statements.

Merrimack Pharmaceuticals, Inc.

Condensed Consolidated Statements of Cash Flows

(unaudited)

	Nine Months EndedSeptember 30,
	Three Months EndedMarch 31,
(in thousands)	~~2023~~2024			~~2022~~2023
Cash flows from operating activities
Net loss	$	(941	)	$	(1,052	)
Net income (loss)	$	201,370		$	(271	)
Adjustments to reconcile net loss to net cash used in operating activities
Less:
Gain on sale of in-process research and development		(139	)		(445	)
Income from discontinued operations		(201,806	)		—
Accretion on short-term investments		(165	)		—
Loss from continuing operations		(436	)		(271	)
Stock-based compensation expense		112			54
Adjustments to reconcile loss from continuing operations to net cash used in operating activities
Gain on sale of in-process research and development		—			(139	)
Accretion of interest income		(64	)		—
Stock-based compensation expense		48			17
Changes in operating assets and liabilities:
Prepaid expenses and other current assets		(1100	)		~~(57~~162	)
Accounts payable, accrued expenses and other		~~(96~~125	)		(~~114~~126	)
Other assets		31			571
Net cash used in operating activities		(1,227	)		(1,557	)
Net cash used in continuing operations for operating activities		(226	)		(356	)
Net cash used in discontinued operations for operating activities		(1,088	)		—
Net cash used in operating activities		(1,314	)		(356	)
Cash flows from investing activities
Net proceeds from sale of in-process research and development		139			445
Proceeds from milestone of a discontinued operation		225,000			—
Proceeds from maturity of short-term investment		3,000			—
Net proceeds from sale of in-process research and development		—			139
Purchases of short-term investments		(15,656	)		—
Proceeds from maturity of short-term investments		3,000			—
Net cash (used in) provided by investing activities		(12,517	)		445
Net cash provided by investing activities		228,000			139
Cash flows from financing activities
Proceeds from exercise of stock options		~~388~~1,485			—179
Net cash provided by financing activities		~~388~~1,485			—179
Net decrease in cash and cash equivalents		(13,356	)		(1,112	)
Net increase (decrease) in cash and cash equivalents		228,171			(38	)
Cash and cash equivalents, beginning of period		195,~~439~~989			1419,~~203~~439
Cash and cash equivalents, end of period	$	6234,~~083~~160		$	1319,~~091~~401
Supplemental disclosure of cash flows
Cash paid for income taxes	$	1,088		$	—

The accompanying notes are an integral part of these condensed consolidated financial statements.

Merrimack Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

1. Nature of the Business

Merrimack Pharmaceuticals, Inc. (the “Company”) is a biopharmaceutical company based in Cambridge, Massachusetts that is entitled to receive up to $~~450~~225.0 million in contingent milestone payments related to its sale of ONIVYDE® and MM-436 (the “Commercial Business”) to Ipsen S.A. (“Ipsen”) in April 2017 (the “Ipsen Sale”). The Company does not have any ongoing research or development activities. The Company does not have any employees and instead uses external consultants for the operation of the Company.

~~The~~On ~~$450~~February 13, 2024, the Company announced that Ipsen S.0A. announced it had received approval from the U.S. Food and Drug Administration (“FDA”) to market ONIVYDE as a first-line treatment of metastatic adenocarcinoma on the pancreas. As a result of this approval by the FDA, the Company received a $225 million milestone payment from Ipsen under the terms of the Ipsen Sale in ~~contingent~~March 2024. On May 10, 2024, the Company’s stockholders approved a plan of dissolution (the “Plan of Dissolution”) whereby the Company will cease operations and dissolve in accordance with Delaware law. Stockholders of record on May 10, 2024 will receive a one-time liquidating dividend of $15.10 per share, which dividend is expected to be paid on or around May 17. Thereafter, the Company intends to transfer any remaining rights to any potential future milestone payments, ~~resulting~~as described below, from Ipsen Pharmaceuticals or Elevation Oncology to a liquidating trust. Currently, the ~~Ipsen~~Company ~~Sale~~has ~~consist~~no expectation that any future milestone payments will occur. If any future milestone payments were received, they would be distributed to stockholders of: record as of May 10, 2024. Following the stockholders’ meeting, the Company expects to delist from trading on NASDAQ on or around May 15, 2024 and to terminate its registration as a reporting company under the Securities Exchange Act of 1934, as amended.

In addition to the $225.0 million milestone that the Company received in March 2024, based upon the approval announced by the ~~U.S.~~FDA ~~Food~~on ~~and~~February ~~Drug~~13, ~~Administration~~2024 ~~(“FDA”)~~ of ONIVYDE® for the first-line treatment of metastatic pancreatic ductal adenocarcinoma (“mPDAC”), ~~subject~~there toare ~~certain~~$225 ~~conditions;~~million of additional contingent milestone payments which could result from the Ipsen Sale. The Company believes that the probability of receiving these additional milestones is remote based on publicly available information provided by Ipsen. The $225.0 million in contingent milestone payments resulting from the Ipsen Sale consist of:

•

$150.0 million upon approval by the FDA of ONIVYDE® for the treatment of small-cell lung cancer after failure of first-line chemotherapy; and

•

$75.0 million upon approval by the FDA of ONIVYDE® for an additional indication unrelated to those described above.

In June 2023, Ipsen announced that the U.S. Food and Drug Administration (FDA) had accepted its supplemental new drug application (sNDA) Onivyde® (irinotecan liposome injection) plus 5 fluorouracil/leucovorin and oxaliplatin (NALIRIFOX regimen) as a potential first-line treatment for mPDAC and that the FDA had provided a Prescription Drug User Fee Act expected goal date of February 13, 2024 for review of the application.

On May 30, 2019, the Company announced the completion of its review of strategic alternatives, following which the Company’s board of directors (the “Board”) implemented a series of measures designed to extend the Company’s cash runway and preserve its ability to capture the potential milestone payments resulting from the Ipsen Sale. In connection with that announcement, the Company discontinued the discovery efforts on its remaining preclinical programs: MM-401, an agonistic antibody targeting a novel immuno-oncology target, TNFR2; and MM-201, a highly stabilized agonist-Fc fusion protein targeting death receptors 4 and 5.

The Company’s termination of its executive management team and all other employees was substantially completed by June 28, 2019 and fully completed by July 12, 2019. As of July 12, 2019, the Company no longer had any employees. The Company has engaged external consultants to run the day-to-day operations of the Company. The Company has also entered into consulting agreements with certain former members of its executive management team who are supporting the Company’s relationship with current partners, ~~assisting with the potential sale of remaining preclinical~~ and ~~clinical assets, and~~ assisting with certain legal and regulatory matters and the continued wind-down of operations.

On July 12, 2019, the Company completed the sale to Elevation Oncology, Inc. (formerly known as 14ner Oncology, Inc.) (“Elevation”) of its anti-HER3 antibody programs, MM-121 (seribantumab) and MM-111 (the “Elevation Sale”). In connection with the Elevation Sale, the Company received an upfront cash payment of $3.5 million. The Company is also eligible to receive up to $54.5 million in additional potential development, regulatory approval and commercial-based milestone payments, consisting of:

•

$3.0 million for achievement of the primary endpoint in the first registrational clinical study of either MM-121 or MM-111;

•

Up to $16.5 million in total payments for the achievement of various regulatory approval and reimbursement-based milestones in the United States, Europe and Japan; and

•

Up to $35.0 million in total payments for achieving various cumulative worldwide net sales targets between $100.0 million and $300.0 million for MM-121 and MM-111.

On September 15, 2021, the Company entered into an Asset Purchase Option Agreement (the "Asset Purchase Option Agreement") with a third party, pursuant to which the third party agreed to obtain an exclusive option, to purchase one of the Company’s preclinical programs with a consideration of $0.5 million. Under the terms of the Asset Purchase Option Agreement, the third party paid to the Company the option fee of $0.1 million. The third party had the right to exercise the option within 24 months from September 15, 2021. The Company recognized a gain of $0.1 million related to the option fee payment for the year ended December 31, 2021. On January 18, 2022, the third party provided written notice to the Company of its intent to exercise such option. On March 1, 2022 the Company and the third party entered into the Asset Purchase Agreement. The consideration of $0.5 million was paid to the Company and a net gain of $0.4 million was recognized in March 2022.

disclosed if this preclinical program utilizes intellectual property licensed from Merrimack. Elevation has also not provided a timeline indicating when this program could reach clinical trials or regulatory approval, if successful.

On January 23, 2023, the Company entered into another Asset Purchase Option Agreement (the “Option Agreement”) with another third party (the “Purchaser”), pursuant to which the Purchaser agreed to obtain an exclusive option (the “Option”) to purchase one of the Company’s preclinical programs with a consideration of $0.7 million. Under the terms of the Option Agreement, the Purchaser paid to the Company the Option fee of $0.2 million and the Company incurred transaction costs less than $0.1 million. A net gain of $0.1 million was recognized in January 2023. The Purchaser decided not to exercise the Option in July 2023.

~~Our~~The Company's remaining non-commercial assets, including ~~our~~its clinical and preclinical development programs, and all material other clinical and pre-clinical development programs have been sold with the exception of one program.

The Company is ~~not~~subject ~~developing~~to risks and ~~commercializing~~uncertainties ~~products. The~~common ~~Company~~to ~~expects~~companies toin ~~dividend~~the ~~out~~biopharmaceutical toindustry, including, among other things, its ~~stockholders~~ability ~~all~~to orsecure ~~substantially~~additional ~~all~~capital to fund operations, development by competitors of ~~any~~new ~~milestone~~technological ~~payments~~innovations, itprotection ~~may~~of ~~receive~~proprietary technology and compliance with government regulations. None of the Company’s ~~does~~product docandidates ~~not~~sold ~~anticipate~~to ~~seeking~~others toor ~~develop~~retained ~~any~~by ~~new~~the ~~products~~Company ~~with~~are approved for any ofindication ~~our~~by ~~existing~~the ~~cash~~FDA or any ~~future~~other ~~milestone~~regulatory ~~payments it may receive~~agency. The Company’s ~~failure~~operates toin ~~achieve~~an ~~these~~environment ~~potential~~of ~~milestone~~rapid ~~payments~~change ~~would~~in ~~depress~~technology ~~the~~and ~~value~~substantial ofcompetition ~~the~~from ~~Company.~~pharmaceutical Aand ~~decline~~biotechnology incompanies, ~~the~~among ~~value~~others. ofIn addition, the Company ~~could~~is ~~also~~dependent ~~cause~~upon ~~its~~the ~~stockholders~~services toof ~~lose~~its ~~all~~external orconsultants ~~part~~for the operation of ~~their~~the ~~investment~~Company.

~~The~~In ~~Company~~accordance iswith ~~subject~~Accounting toStandards ~~risks~~Codification ~~and~~(“ASC”) ~~uncertainties common to companies in the biopharmaceutical industry~~205-40, ~~including,~~Going ~~among other things~~Concern, ~~its~~the ~~ability~~Company tohas ~~secure~~evaluated ~~additional~~whether ~~capital~~there toare ~~fund~~conditions ~~operations~~and events, ~~development~~considered byin ~~competitors~~the ~~of new technological innovations~~aggregate, ~~protection~~that ofraise ~~proprietary~~substantial ~~technology~~doubt ~~and~~about ~~compliance with government regulations. None of~~ the Company’s ~~product~~ability ~~candidates sold~~ to ~~others~~continue oras ~~retained~~a bygoing ~~the~~concern ~~Company~~within ~~are~~one ~~approved~~year ~~for~~after ~~any~~the ~~indication~~date bythat the ~~FDA~~condensed orconsolidated ~~any~~financial ~~other~~statements ~~regulatory~~are ~~agency~~issued. ~~The~~As ~~Company~~of ~~operates~~March in31, an2024, ~~environment~~the ofCompany ~~rapid~~had ~~change~~an inaccumulated ~~technology~~deficit ~~and~~of ~~substantial~~$347.4 ~~competition~~million. ~~from~~During ~~pharmaceutical~~the ~~and~~three ~~biotechnology~~months ~~companies,~~ended ~~among~~March ~~others.~~31, ~~In addition~~2024, the Company isincurred ~~dependent~~net ~~upon~~loss ~~the~~from ~~services~~continuing operations of ~~its~~$0.4 ~~external~~million ~~consultants~~and ~~for~~used ~~the~~$1.3 ~~operation~~million of ~~the~~cash ~~Company~~in operating activities. The Company’s ~~business~~expects ~~strategy~~to ~~depends~~continue ~~substantially~~to ~~upon~~generate ~~its~~operating ~~ability~~losses tofor ~~receive~~the foreseeable future. ~~milestone~~The ~~payments~~Company ~~from~~expects ~~Ipsen.~~that ~~Any~~its ~~failure~~cash toand ~~achieve~~cash ~~such~~equivalents ~~milestones~~and orshort-term ainvestments ~~perception~~of ~~that~~$244.1 ~~the~~million ~~milestones~~at ~~may~~March ~~not~~31, be2024 ~~achieved~~ will ~~materially~~be ~~and~~sufficient ~~adversely~~to ~~affect~~fund ~~the~~operations ~~Company~~for ~~and~~ the ~~value~~foreseeable ~~of its common stock~~future.

In accordance with Accounting Standards Codification (“ASC”) 205-40, Going Concern, the Company has evaluated whether there are conditions and events, considered in the aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the condensed consolidated financial statements are issued. As of September 30, 2023, the Company had an accumulated deficit of $548.6 million. During the nine months ended September 30, 2023, the Company incurred a net loss of $0.9 million and used $1.2 million of cash in operating activities. The Company expects to continue to generate operating losses for the foreseeable future. The Company expects that its cash and cash equivalents and short-term investment of $18.9 million at September 30, 2023 will allow the Company to continue its operations into 2027, which the Company estimates is beyond the latest date that the longest-term potential Ipsen milestone may be achieved. The continued viability of the Company beyond that point is dependent on its ability to raise additional capital to finance its operations or to reduce operating expenses. There can be no assurance that the Company will be able to obtain sufficient capital to cover its costs on acceptable terms, if at all.

The Company expects that it would seek to finance any future cash needs through a combination of divestitures of its rights under the Ipsen and Elevation agreements, equity offerings and debt financings. There can be no assurance as to the timing, terms or consummation of any divestiture or financing, and the terms of any such financing may adversely affect the holdings or the rights of the Company’s stockholders or require the Company to relinquish rights to certain of its revenue streams or product candidates.

2. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying condensed consolidated financial statements reflect the operations of Merrimack Pharmaceuticals, Inc. and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated.

The condensed consolidated financial statements are unaudited and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”).

The accounting policies followed in the preparation of the interim condensed consolidated financial statements are consistent in all material respects with those presented in Note 1 to the financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, ~~2022~~2023.

Unaudited Interim Financial Information

The condensed consolidated balance sheet as of December 31, ~~2022~~2023 was derived from audited financial statements for the year ended December 31, ~~2022~~2023, but ~~the~~does not include all disclosures required by GAAP. The condensed consolidated balance sheet as of March 31, 2024, the condensed consolidated statements of operations and comprehensive loss for the three months ended March 31, 2024 and 2023, the condensed consolidated statements of stockholders’ equity for the three months ended March 31, 2024 and 2023 and the condensed consolidated statements of cash flows for the three months ended March 31, 2024 and 2023 are unaudited. The unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited annual financial statements and, in ~~this~~the ~~Form~~opinion ~~10-Q~~of atmanagement, ~~December~~reflect all adjustments, which include only normal recurring adjustments, necessary for the fair statement of the Company’s financial position as of March 31, ~~2022~~2024, ~~does~~the results of its operations for the three months ended March 31, 2024 and 2023, its statements of stockholders’ equity for the three months ended March 31, 2024 and 2023 and its statements of cash flows for the three months ended March 31, 2024 and 2023. The financial data and other information disclosed in the notes related to the three months ended March 31, 2024 and 2023 are unaudited. The results for the three months ended March 31, 2024 and 2023 are not ~~include~~necessarily ~~all~~indicative of results to be expected for the year ending December 31, 2024, any other interim periods, or any future year or period.

~~disclosures~~in ~~required~~financial ~~by GAAP. The condensed consolidated balance sheet as of September 30, 2023, the condensed consolidated~~ statements ofprepared ~~operations~~in ~~and~~accordance ~~comprehensive~~with ~~loss~~GAAP ~~for~~have ~~the~~been ~~three and nine months ended September 30, 2023 and 2022, the~~ condensed ~~consolidated~~or ~~statements~~omitted offrom ~~stockholders’~~this ~~equity for the three and nine months ended September 30~~report, ~~2023~~as ~~and~~is ~~2022~~permitted ~~and~~by ~~the~~such ~~condensed~~rules ~~consolidated statements of cash flows for the nine months ended September 30, 2023~~ and ~~2022 are unaudited~~regulations. ~~The~~These unaudited ~~interim~~ condensed consolidated financial statements ~~have~~should ~~been~~be ~~prepared~~read onin ~~the~~conjunction ~~same~~with ~~basis as~~ the audited ~~annual~~ financial statements and, in the ~~opinion~~notes ofthereto ~~management,~~contained ~~reflect~~in ~~all adjustments, which include only normal recurring adjustments, necessary for~~ the ~~fair statement of the~~ Company’s ~~financial~~Annual ~~position~~Report ason ofForm ~~September~~10-K ~~30, 2023, the results of its operations~~ for the ~~three~~year ~~and nine months~~ ended ~~September~~December 3031, 2023 ~~and~~filed ~~2022,~~with ~~its statements of stockholders’ equity for~~ the ~~three~~SEC ~~and~~on ~~nine~~March ~~months ended September 30~~7, ~~2023 and 2022 and its statements of cash flows for the nine months ended September 30, 2023 and 2022~~2024. The financial data and other information disclosed in the notes related to the three and nine months ended September 30, 2023 and 2022 are unaudited. The results for the three and nine months ended September 30, 2023 and 2022 are not necessarily indicative of results to be expected for the year ending December 31, 2023, any other interim periods, or any future year or period.

The unaudited interim financial statements of the Company included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted from this report, as is permitted by such rules and regulations. These unaudited condensed consolidated financial statements should be read in conjunction with the audited financial statements and the notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 filed with the SEC on March 9, 2023.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates, assumptions and judgments that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of expenses during the reporting periods. Significant estimates, assumptions and judgments reflected in these condensed consolidated financial statements include, but are not limited to, the accrual of research and development expenses and the valuation of stock-based awards. Estimates are periodically reviewed in light of changes in circumstances, facts and experience. Actual results could differ from the Company’s estimates.

3. ~~Fair~~Discontinued ~~Value~~Operations - Sale of ~~Financial~~Commercial ~~Instruments~~Business

~~The following tables show assets measured at fair value on a recurring basis as of September 30, 2023 and December 31, 2022:~~Ipsen

	September 30, 2023
(in thousands)	Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	5,725	$	—	$	—
Totals	$	5,725	$	—	$	—
Short-term investments:
Treasury bills and notes	$	—	$	12,821	$	—
Totals	$	—	$	12,821	$	—

On April 3, 2017, the Company completed the sale of the Commercial Business to Ipsen. The Commercial Business represented a discontinued operation since the disposal of the Commercial Business was a strategic shift that had a major effect on the Company’s operations and financial results. The Company will not have further significant involvement in the operations of the discontinued Commercial Business. The operating results of the Commercial Business are reported as discontinued operations, net of tax in the condensed consolidated statements of operations and comprehensive loss for all periods presented.

	December 31, 2022
(in thousands)	Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	18,148	$	—	$	—
Totals	$	18,148	$	—	$	—

Discontinued Operations

The condensed consolidated financial statements for the three months ended March 31, 2024 and 2023 reflect the operations of the Commercial Business as a discontinued operation. Discontinued operations for the three months ended March 31, 2024 and 2023 includes the following:


	Three Months Ended March 31,
(in thousands)	2024			2023
Other income and expenses:
Gain on sale of Commercial Business	$	225,000		$	—
Income from discontinued operations		225,000			—
Income tax expense		(23,194	)		—
Total income from discontinued operations	$	201,806		$	—

During the three months ended March 31, 2024, the Company received $225.0 million milestone payment related to the development and commercialization of ONIVYDE. The Company included the $225.0 million in discontinued operations because the amounts directly relate to the Commercial Business, which was classified as a discontinued operation.

The Company recorded the income tax implications of the milestone payment in the first quarter of 2024 on a discrete basis. The milestone generated taxable income for the Company which has resulted in income tax expense. The Company released a portion of its valuation allowance in the three months ended March 31, 2024 as it is now able to utilize its net operating loss carryforwards to offset the taxable income generated from the milestone payment. The Company’s current income tax expense for the three months ended March 31, 2024 is $23.2 million, which is comprised primarily of federal IRC Section 453A interest and the Massachusetts equivalent of IRC Section 453A interest expense.

~~There~~4. ~~were~~Fair noValue ~~liabilities measured at fair value on a recurring basis as~~ of ~~September~~Financial ~~30, 2023 and December 31, 2022.~~Instruments

The following tables show assets measured at fair value on a recurring basis as of March 31, 2024 and December 31, 2023:


	March 31, 2024
(in thousands)	Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	5,996	$	—	$	—
Totals	$	5,996	$	—	$	—

Short-term investments:
Treasury bills and notes	$	—	$	9,950	$	—
Totals	$	—	$	9,950	$	—


	December 31, 2023
(in thousands)	Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	5,721	$	—	$	—
Totals	$	5,721	$	—	$	—

Short-term investments:
Treasury bills and notes	$	—	$	12,886	$	—
Totals	$	—	$	12,886	$	—

There were no liabilities measured at fair value on a recurring basis as of March 31, 2024 and December 31, 2023.

The following table summarizes the carrying values and fair values of the Company's financial instruments:

	September 30, 2023
	March 31, 2024
(in thousands)	AmortizedCost		Allowance for Credit Losses		Net Carrying Amount		Gross UnrealizedGains		Gross UnrealizedLosses		FairValue
Short-term investments:
Treasury bills and note	$	12,821	$	—	$	12,821	$	—	$	—	$	12,821
Treasury bills and notes	$	9,950	$	—	$	9,950	$	—	$	—	$	9,950
Total short-term investments	$	129,~~821~~950	$	—	$	129,~~821~~950	$	—	$	—	$	129,~~821~~950

As of December 31, 2022, the Company did not hold any short-term investments. The Company has investments in U.S. Treasury Bills and U.S. Treasury Notes as of September 30, 2023, some of which mature over a period greater than 90 days but within one year and are classified as short-term investments. The U.S. Treasury Bills and U.S. Treasury Notes are carried at amortized cost and classified as held to maturity as the Company has the intent and the ability to hold them until they mature. The carrying value of the U.S. Treasury Bills and U.S. Treasury Notes are adjusted for accretion of discounts over the remaining life of the investment. Income related to the U.S. Treasury Bills and U.S. Treasury Notes is recognized in interest income in the Company’s condensed consolidated statement of operations.


	December 31, 2023
(in thousands)	Amortized Cost		Allowance for Credit Losses		Net Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Short-term investments:
Treasury bills and notes	$	12,886	$	—	$	12,886	$	—	$	—	$	12,886
Total short-term investments	$	12,886	$	—	$	12,886	$	—	$	—	$	12,886

4The Company has investments in U.S. ~~Accounts~~Treasury ~~Payable~~Bills and U.S. Treasury Notes as of March 31, ~~Accrued~~2024 ~~Expenses~~and December 31, 2023, some of which mature over a period greater than 90 days but within one year and ~~Other~~are classified as short-term investments. The U.S. Treasury Bills and U.S. Treasury Notes are carried at amortized cost and classified as held to maturity as the Company has the intent and the ability to hold them until they mature. The carrying value of the U.S. Treasury Bills and U.S. Treasury Notes are adjusted for accretion of discounts over the remaining life of the investment. Income related to the U.S. Treasury Bills and U.S. Treasury Notes is recognized in interest income in the Company’s consolidated statement of operations and comprehensive loss.

Accounts payable, accrued expenses and other as of September 30, 2023 and December 31, 2022 consisted of the following:

(in thousands)	September 30, 2023		December 31, 2022
Accounts payable	$	111	$	188
Accrued goods and services		144		139
Accrued clinical trial costs		47		71
Others		191		191
Total accounts payable, accrued expenses and other	$	493	$	589

5. Stock-Based Compensation

On April 15, 2021, the Company’s Board of Directors adopted the 2021 Incentive Award Plan (the “2021 Plan”) to replace the 2011 Stock Incentive Plan (the “2011 Plan”). The 2021 Plan was approved by the Company’s stockholders at the Company’s Annual Meeting of Stockholders held on June 10, 2021. The 2021 Plan is administered by the Company’s Board of Directors and permits the Company to grant incentive and non-qualified stock options, stock appreciation rights, restricted stock, restricted stock units and other stock-based awards.

There were 22,000 options granted during each of the nine months ended September 30, 2023 and 2022 under the 2021 Plan. At September 30, 2023, there were 209,000 shares remaining available for grant under the 2021 Plan.

The aggregate intrinsic value was calculated as the difference between the exercise price of the stock options and the fair value of the underlying common stock. The aggregate intrinsic value of options exercised during the nine months ended September 30, 2023 is $0.9 million. There were no options exercised during the three months ended September 30, 2023 and the three and nine months ended September 30, 2022.

The Company recognized stock-based compensation expense of $48 thousand and $112 thousand for the three and nine months ended September 30, 2023, respectively, and $17 thousand and $54 thousand for the three and nine months ended September 30, 2022, respectively, which are included in general and administrative expense on the accompanying condensed consolidated statement of operations and comprehensive loss.

6. Net Loss Per Common Share

Basic net loss per share is calculated by dividing the net loss attributable to Merrimack Pharmaceuticals, Inc. by the weighted-average number of common shares outstanding during the period.

~~Diluted net loss per share is computed by dividing the net loss attributable to Merrimack Pharmaceuticals, Inc~~5. byAccounts the weighted-average number of dilutive common shares outstanding during the period. Dilutive shares outstanding is calculated by adding to the weighted shares outstanding any potential (unissued) shares of common stock from outstanding stock options based on the treasury stock method. Outstanding stock options were not included in the diluted net loss per share calculation because the options were out of the money or to do so would have been antidilutive (i.e.Payable, ~~the~~Accrued ~~total~~Expenses proceeds upon exercise would have exceeded the market value of the underlying common shares). In a period when a net loss is reported, all common stock equivalents are excluded from the calculation because they would have an anti-dilutive effect, meaning the loss per share would be reduced. Therefore, in periods where a loss is reported, there is no difference in basic and ~~dilutive loss per share.~~Other

~~Stock~~Accounts ~~options~~payable, ~~are~~accrued ~~excluded~~expenses ~~from~~and ~~the~~other ~~calculation~~as of ~~diluted~~March ~~loss~~31, ~~per~~2024 ~~share because the net loss for the three~~ and ~~nine~~December ~~months ended September 30~~31, 2023 ~~and~~consisted ~~2022 causes such securities to be anti-dilutive. Outstanding options excluded from the calculation~~ of ~~diluted loss per share for~~ the ~~three and nine months ended September 30, 2023 and 2022 are shown in the chart below~~following:

	Three and Nine Months Ended September 30,
(in thousands)	March 31, 2024		December 31, 2023
(in thousands)	2023		2022
Accounts payable	$	168	$	74
Outstanding options to purchase common stock		641		1,628
Accrued goods and services		161		130
Accrued clinical trial costs		46		46
Others		191		191
Total accounts payable, accrued expenses and other	$	566	$	441

76. ~~Recent~~Stock-Based ~~Accounting Pronouncements~~Compensation

The Company initially reserved 275,000 of its common stock for the issuance of awards under the 2021 Plan. There were no options granted during each of the three months ended March 31, 2024 and 2023 under the 2021 Plan. At March 31, 2024, there were 209,000 shares remaining available for grant under the 2021 Plan.

The aggregate intrinsic value was calculated as the difference between the exercise price of the stock options and the fair value of the underlying common stock. The aggregate intrinsic value of options exercised during the three months ended March 31, 2024 and 2023 is $1.1 million and $0.3 million, respectively.

The Company recognized stock-based compensation expense of $48 thousand and $17 thousand in general and administrative expenses during the three months ended March 31, 2024 and 2023, respectively.

7. Net Income (Loss) Per Common Share

Basic net income (loss) per share is calculated by dividing the net loss attributable to Merrimack Pharmaceuticals, Inc. by the weighted-average number of common shares outstanding during the period.

Diluted net income (loss) per share is computed by dividing the net income (loss) attributable to Merrimack Pharmaceuticals, Inc. by the weighted-average number of dilutive common shares outstanding during the period. Dilutive shares outstanding is calculated by adding to the weighted shares outstanding any potential (unissued) shares of common stock from outstanding stock options based on the treasury stock method. Outstanding stock options were not included in the diluted net income (loss) per share calculation because in a period when a net loss from continuing operations is reported, all common stock equivalents are excluded from the calculation because they would have an anti-dilutive effect, meaning the income (loss) per share would be reduced. Therefore, in periods where a net loss from continuing operations is reported, there is no difference in basic and dilutive income (loss) per share.

Stock options are excluded from the calculation of diluted income (loss) per share because the net income (loss) for the three months ended March 31, 2024 and 2023 causes such securities to be anti-dilutive. Outstanding options excluded from the calculation of diluted income (loss) per share for the three months ended March 31, 2024 and 2023 are shown in the chart below:


	Three Months Ended March 31,
(in thousands)	2024		2023
Outstanding options to purchase common stock		344		695

8. Recent Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB”) or other standard setting bodies that the Company adopts as of the specified effective date. Unless otherwise discussed above, the Company does not believe that the adoption of recently issued standards has or may have a material impact on the Company’s condensed consolidated financial statements or disclosures.

9. Subsequent Events

On May 10, 2024, the Company’s stockholders approved a Plan of Dissolution whereby the Company will cease operations and dissolve in accordance with Delaware law. Stockholders of record on May 10, 2024 will receive a one-time liquidating dividend of $15.10 per share, which dividend is expected to be paid on or around May 17. Thereafter, the Company intends to transfer any remaining rights to any potential future milestone payments, as described below, from Ipsen Pharmaceuticals or Elevation Oncology to a liquidating trust. Currently, the Company has no expectation that any future milestone payments will occur. If any future milestone payments were received, they would be distributed to stockholders of record as of May 10, 2024. Following the stockholders’ meeting, the Company expects to delist from trading on NASDAQ on or around May 15, 2024 and to terminate its registration as a reporting company under the Securities Exchange Act of 1934, as amended.

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion of our financial condition and results of operations should be read in conjunction with our financial statements and the notes to those financial statements appearing elsewhere in this Quarterly Report on Form 10-Q and the audited consolidated financial statements and notes thereto and management’s discussion and analysis of financial condition and results of operations for the year ended December 31, ~~2022~~2023 included in our Annual Report on Form 10-K. This discussion contains forward-looking statements that involve significant risks and uncertainties. As a result of many factors, such as those set forth in Part II, Item 1A. Risk Factors of this Quarterly Report on Form 10-Q, which are incorporated herein by reference, our actual results may differ materially from those anticipated in these forward-looking statements.

Overview

We are a biopharmaceutical company based in Cambridge, Massachusetts that is entitled to receive up to $~~450~~225.0 million in contingent milestone payments related to our sale of ONIVYDE® to Ipsen S.A., or Ipsen, in April 2017 and up to $54.5 million in contingent milestone payments related to our sale of MM-121 and MM-111 to Elevation Oncology, Inc. (formerly known as 14ner Oncology, Inc.), or Elevation, in July 2019. We do not have any ongoing research or development activities ~~and are seeking potential acquirers for our remaining preclinical and clinical assets~~. We do not have any employees and instead use external consultants for the operation of our company.

On ~~April~~February 313, ~~2017~~2024, we ~~completed~~announced that Ipsen S.A. announced it had received approval from the ~~sale~~FDA ofto market ONIVYDE ~~and~~as MMa first-~~436~~line (treatment of metastatic adenocarcinoma on the ~~“commercial~~pancreas. ~~business”)~~As toa ~~Ipsen~~result (of this approval by the “FDA, we received a $225 million milestone payment from Ipsen ~~sale”)~~in March 2024. InOn ~~connection~~May 10, 2024, our stockholders approved a Plan of Dissolution whereby we will cease operations and dissolve in accordance with ~~the~~Delaware ~~Ipsen~~law. ~~sale~~Stockholders of record on May 10, 2024 will receive a one-time liquidating dividend of $15.10 per share, which dividend is expected to be paid on or around May 17. Thereafter, we ~~are~~intend ~~eligible~~to transfer any remaining rights to ~~receive~~any uppotential future milestone payments, as described below, from Ipsen Pharmaceuticals or Elevation Oncology to ~~$450~~a liquidating trust.0 ~~million~~Currently, inwe ~~additional~~have ~~regulatory~~no ~~approval-based~~expectation that any future milestone payments will occur. If any future milestone payments were received, they would be distributed to stockholders of record as of May 10, 2024. Following the stockholders’ meeting, we expect to delist from trading on NASDAQ on or around May 15, 2024 and to terminate its registration as a reporting company under the Securities Exchange Act of 1934, as amended.

In addition to the $225 million milestone that the Company received in March 2024, based upon the approval announced by the FDA on February 13, 2024 of ONIVYDE® for the first-line treatment of metastatic pancreatic ductal adenocarcinoma (“mPDAC”), there are $225 million of additional contingent milestone payments which could result from the Ipsen Sale. The ~~remaining~~Company upbelieves tothat the probability of receiving these additional milestones is remote based on publicly available information provided by Ipsen. The $~~450~~225.0 million in ~~potential~~contingent milestone payments resulting from the Ipsen ~~sale~~Sale consist of:

•

$225.0 million upon approval by the U.S. Food and Drug Administration, or FDA, of ONIVYDE for the first-line treatment of metastatic adenocarcinoma of the pancreas, subject to certain conditions;

$150.0 million upon approval by the FDA of ONIVYDE for the treatment of small-cell lung cancer after failure of first-line chemotherapy; and

•

$75.0 million upon approval by the FDA of ONIVYDE for an additional indication unrelated to those described above.

Our non-commercial assets, including our clinical and preclinical development programs, were not included in the Ipsen sale and remain assets of ours.

In November 2022, Ipsen announced the Phase III NAPOLI 3 trial of Onivyde® (irinotecan liposome injection) plus 5-fluorouracil/leucovorin and oxaliplatin (the “NALIRIFOX regimen”) met its primary endpoint demonstrating clinically meaningful and statistically significant improvement in overall survival compared to nab-paclitaxel plus gemcitabine in 770 previously untreated patients with metastatic pancreatic ductal adenocarcinoma (“mPDAC”) and key secondary efficacy outcome of progression-free survival (PFS) also showed significant improvement over the comparator arm. Ipsen also announced that the safety profile of Onivyde in the NAPOLI 3 trial was consistent with those observed in the previous phase I/II mPDAC study. Ipsen also stated that it intends to file a supplemental New Drug Application with the U.S. Food and Drug Administration for Onivyde in combination with oxaliplatin plus 5-fluorouracil/leucovorin for the treatment of patients with previously untreated mPDAC following the Fast Track Designation granted in 2020. In January 2023, Ipsen presented clinical trial results at the 2023 American Society of Clinical Oncology (ASCO) Gastrointestinal Cancers Symposium. In June 2023, Ipsen announced that the U.S. Food and Drug Administration (FDA) had accepted its supplemental new drug application (sNDA) Onivyde® (irinotecan liposome injection) plus 5 fluorouracil/leucovorin and oxaliplatin (NALIRIFOX regimen) as a potential first-line treatment for metastatic pancreatic ductal adenocarcinoma (mPDAC) and that the FDA had provided a Prescription Drug User Fee Act goal date of 13 February 2024 for review of the application.

In August 2022, Ipsen announced that the Phase III RESILIENT trial did not meet its primary endpoint of overall survival compared to topotecan. The trial is evaluating Onivyde® (irinotecan liposomal injection) versus topotecan in patients with small cell lung cancer, who have progressed on or after platinum-based first-line therapy treatment. RESILIENT is a Phase III trial conducted in two parts; the first part read out in 2020 confirming the safety, dosing and efficacy of Onivyde; part two is evaluating the efficacy of Onivyde versus topotecan. The analysis concluded that the primary endpoint overall survival was not met in patients treated with Onivyde versus topotecan. However, a doubling of the secondary endpoint of objective response rate in favor of Onivyde was observed. The safety and tolerability of Onivyde was consistent with its already-known safety profile, and no new safety concerns emerged. The clinical study results will be communicated with the regulatory agency. Ipsen indicated that while the results from the analysis of the RESILIENT trial have not demonstrated an overall survival benefit with Onivyde in patients in second-line small cell lung cancer, Ipsen intends to analyze the data further before decisions regarding next steps are made. To date, there have been no further public announcements by Ipsen regarding these matters and it remains unclear as to whether Ipsen will continue to seek approval for the use of ONIVYDE in the small cell lung cancer application. If Ipsen elects not to proceed with seeking regulatory approval, or if regulatory approval is not obtained, we would not be entitled to the $150 million milestone payment tied to approval of Onivyde for treating small cell lung cancer.

On May 30, 2019, we announced the completion of our review of strategic alternatives, following which our board of directors implemented a series of measures designed to extend our cash runway into 2027 and preserve our ability to capture the potential milestone payments resulting from the Ipsen ~~sale.~~has Wenot ~~have~~mentioned ~~based~~any ~~this~~other ~~estimate~~ONIVYDE onclinical assumptions that may prove to be wrong, and we could use our financial resources sooner than we currently expect. In connection with that announcement, we discontinued the discovery efforts on our remaining preclinical programs: ~~MM-401,~~in anrecent ~~agonistic~~communications ~~antibody~~regarding ~~targeting~~its adevelopment ~~novel immuno-oncology target, TNFR2; and MM-201, a highly stabilized agonist-Fc fusion protein targeting death receptors 4 and 5~~pipeline. ~~We are seeking potential acquirers for our remaining preclinical and clinical assets.~~

~~The~~On ~~termination~~May of30, ~~our~~2019, ~~executive~~we ~~management~~announced ~~team~~the ~~and~~completion ~~all~~of ~~other~~our ~~employees~~review ~~was~~of ~~substantially~~strategic ~~completed~~alternatives, byfollowing ~~June~~which ~~28,~~our ~~2019~~board ~~and~~of ~~fully~~directors ~~completed~~implemented bya ~~July~~series ~~12,~~of ~~2019.~~measures Asdesigned ofto ~~July~~extend ~~12,~~our ~~2019,~~cash werunway ~~did~~into ~~not~~2027 ~~have~~and ~~any~~preserve ~~employees.~~our Weability ~~have~~to ~~engaged~~capture ~~external~~the ~~consultants~~potential tomilestone ~~run~~payments ~~our~~resulting ~~day-to-day~~from ~~operations~~the Ipsen sale. We have ~~also~~based ~~entered~~this ~~into~~estimate ~~consulting~~on ~~agreements~~assumptions ~~with~~that ~~certain~~may ~~former~~prove ~~members~~to ofbe wrong, and we could use our ~~executive~~financial ~~management~~resources ~~team~~sooner ~~who~~than ~~are~~we ~~supporting~~currently ~~our~~expect. ~~relationship~~In connection with ~~current~~that ~~partners~~announcement, ~~assisting~~we ~~with~~discontinued the ~~potential~~discovery ~~sale~~efforts ofon our remaining preclinical ~~and~~programs: ~~clinical assets~~MM-401, ~~and~~an ~~assisting~~agonistic ~~with~~antibody ~~certain~~targeting ~~legal~~a ~~and~~novel ~~regulatory~~immuno-oncology ~~matters~~target, TNFR2; and ~~the~~MM-201, ~~continued~~a ~~wind~~highly stabilized agonist-~~down~~Fc offusion ~~operations~~protein targeting death receptors 4 and 5.

The termination of our executive management team and all other employees was substantially completed by June 28, 2019 and fully completed by July 12, 2019. As of July 12, 2019, we did not have any employees. We have engaged external consultants to run our day-to-day operations. We have also entered into consulting agreements with certain former members of our executive management team.

On July 12, 2019, we completed the sale to Elevation, or the Elevation sale, of our anti-HER3 antibody programs, MM-121 (seribantumab) and MM-111. In connection with the Elevation sale, we received an upfront cash payment of $3.5 million and are eligible to receive up to $54.5 million in additional potential development, regulatory approval and commercial-based milestone payments, consisting of:

•

$3.0 million for achievement of the primary endpoint in the first registrational clinical study of either MM-121 or MM-111;

•

Up to $16.5 million in total payments for the achievement of various regulatory approval and reimbursement-based milestones in the United States, Europe and Japan; and

•

Up to $35.0 million in total payments for achieving various cumulative worldwide net sales targets between $100.0 million and $300.0 million for MM-121 and MM-111.

In January 2023, Elevation announced that it ishad ~~pausing~~paused further investment in the clinical development of seribantumab and intends to pursue further development only in collaboration with a partner. In January of 2024 Elevation announced that it is evaluating initiation of a development program utilizing a antibody drug conjugate (ADC) targeting HER3. Elevation has not disclosed if this preclinical program utilizes intellectual property licensed from Merrimack. Elevation has also not provided a timeline indicating when this program could reach clinical trials or regulatory approval, if successful.

12On January 23, 2023, we entered into an Asset Purchase Option Agreement (the “Option Agreement”) with a third party (the “Purchaser”), pursuant to which the Purchaser agreed to obtain an exclusive option (the “Option”) to purchase one of the Company’s preclinical programs with a consideration of $0.7 million. Under the terms of the Option Agreement, the Purchaser paid to us the Option fee of $0.2 million and we incurred transaction cost of less than $0.1 million. A net gain of $0.1 million was recognized in January 2023. In July 2023, the Purchaser decided not to exercise the Option.

On September 15, 2021, we entered into an Asset Purchase Option Agreement (the “Asset Purchase Option Agreement”) with a third party, pursuant to which the third party obtained an exclusive option, to purchase one of our preclinical programs with a consideration of $0.5 million. Under the terms of the Asset Purchase Option Agreement, the third party paid to us the option fee of $0.1 million.. On March 1, 2022, the third party exercised the option and we received consideration of $0.5 million and a gain of $0.5 million was recognized in March 2022.

On January 23, 2023, we entered into an Asset Purchase Option Agreement (the “Option Agreement”) with a third party (the “Purchaser”), pursuant to which the Purchaser agreed to obtain an exclusive option (the “Option”) to purchase one of the Company’s preclinical programs with a consideration of $700 thousand. Under the terms of the Option Agreement, the Purchaser paid to us the Option fee of $150 thousand and we incurred transaction cost of $11 thousand. A net gain of $139 thousand was recognized in January 2023. In July 2023, the Purchaser decided not to exercise the Option.

We previously devoted substantially all of our resources to our drug discovery and development efforts, including conducting clinical trials for our product candidates, protecting our intellectual property and providing general and administrative support for these operations. We have financed our operations primarily through private placements of convertible preferred stock, collaborations, public offerings of our securities, secured debt financings, sales of ONIVYDE and the Ipsen sale.

As of ~~September~~March 3031, ~~2023~~2024, we had unrestricted cash and cash equivalents and short-term ~~investment~~investments of $18244.91 million. We expect that our cash and cash equivalents ~~and short-term investment~~ as of ~~September~~March 3031, ~~2023~~2024 will be sufficient to continue our operations ~~into~~for ~~2027, when we estimate~~ the ~~longest-term~~foreseeable ~~potential Ipsen milestone may be achieved~~future.

As of ~~September~~March 3031, ~~2023~~2024, we had an accumulated deficit of $~~548~~347.64 million. Our net loss from our continuing operations was $0.94 million and $10.13 million for the ~~nine~~three months ended ~~September~~March 3031, ~~2023~~2024 and ~~2022~~2023, respectively. We do not expect to have any research and development expenses going forward. ~~We do not expect to be profitable from our continuing operations in the future.~~

Financial Operations Overview

General and administrative expenses

General and administrative expenses consist primarily of stock-based compensation expenses, legal, intellectual property, business development, finance, information technology, corporate communications and investor relations. Other general and administrative expenses include costs for board of director’s costs, insurance expenses, legal and professional fees, and accounting and information technology services fees.

Interest income

Interest income consists primarily of interest income associated with our money market fund, ~~and~~U.S. ~~short-term~~Treasury ~~investment~~Bills and U.S. Treasury Notes.

Critical Accounting Policies and Significant Judgments and Estimates

Our management’s discussion and analysis of our financial condition and results of operations is based on our condensed consolidated financial statements, which we have prepared in accordance with the rules and regulations of the Securities and Exchange Commission, or the SEC, and generally accepted accounting principles in the United States, or GAAP. The preparation of these condensed consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported expenses during the reporting periods. We evaluate our estimates and judgments on an ongoing basis. We base our estimates on historical experience and on various other factors that we believe are 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. Our actual results may differ from these estimates under different assumptions or conditions.

Our critical accounting policies and the methodologies and assumptions we apply under them have not materially changed since March 97, ~~2023~~2024, the date we filed our Annual Report on Form 10-K for the year ended December 31, ~~2022~~2023. For more information on our critical accounting policies, refer to our Annual Report on Form 10-K for the year ended December 31, ~~2022~~2023.

Results of Operations

Comparison of the three months ended ~~September~~March 3031, ~~2023~~2024 and ~~2022~~2023

	Three Months EndedSeptember 30,
	Three Months EndedMarch 31,
(in thousands)	~~2023~~2024			~~2022~~2023
Operating expenses:
General and administrative expenses	$	~~531~~669		$	~~504~~586
Total operating expenses		531			504
Gain on sale of assets		—			(139	)
Loss from operations		(531	)		(504	)
Total operating expenses		669			447
Interest income		252			62
Loss from operations		(669	)		(447	)
Net loss	$	(279	)	$	(442	)
Interest income		233			176
Total other income		233			176

General and administrative expenses

General and administrative expenses were $0.57 million for the three months ended ~~September~~March 3031, ~~2023~~2024 ~~compared~~and to $0.56 million for the three months ~~ended~~ending ~~September~~March 3031, ~~2022~~2023, anno ~~increase~~significant ofchanges ~~$27~~during ~~thousand, or 5%. This increase was primarily attributable to~~ the ~~increase~~three inmonths ~~the~~ended ~~share-based~~March ~~compensation~~31, ~~expense~~2024.

Interest income

Interest income was $0.3 million for the three months ended September 30, 2023 and $0.1 million for the three months ended September 30, 2022, primarily attributable to the increased interest rate earned on our money market funds and interest income earned from U.S. Treasury Bills and U.S. Treasury Notes.

Comparison of the nine months ended September 30, 2023 and 2022

	Nine Months EndedSeptember 30,
(in thousands)	2023			2022
Operating expenses:
General and administrative expenses	$	1,686		$	1,567
Gain on sale of assets		(139	)		(445	)
Total operating expenses		1,547			1,122
Loss from operations		(1,547	)		(1,122	)
Interest income		606			70
Net loss	$	(941	)	$	(1,052	)

General and administrative expenses

General and administrative expenses were $1.7 million for the nine months ended September 30, 2023 compared to $1.6 million for the nine months ended September 30, 2022, an increase of $0.1 million, or 8%. This increase was primarily attributable to the increase in the share-based compensation expense of apporximately $0.1 million.

Gain on sale of assets

Gain on sale of assets was $0.1 million ~~and $0.4 million~~ for the ~~nine~~three months ended ~~September~~March 3031, 2023 ~~and 2022~~, ~~respectively,~~ attributable to the sale of certain of our preclinical programs to third parties. There is no gain on sale of assets during the three months ended March 31, 2024.

Interest income

Interest income was $0.62 million for the ~~nine~~three months ended ~~September~~March 3031, ~~2023~~2024 and ~~$0.1 million for the nine months ended September 30~~2023, ~~2022,~~ primarily attributable to the ~~increase of~~ interest ~~rate~~ associated with our money market fund, ~~and interest income earned from~~ U.S. Treasury Bills and U.S. Treasury Notes.

Liquidity and Capital Resources

Sources of liquidity

We have financed our operations through ~~September~~March 3031, ~~2023~~2024 primarily through private placements of convertible preferred stock, collaborations, public offerings of our securities, secured debt financings, sales of our common stock, sales of our commercial and in-process research and development assets and exercise of stock options. As of ~~September~~March 3031, ~~2023~~2024, we had unrestricted cash and cash equivalents and short-term investments of $18244.91 million.

Cash flows

The following table provides information regarding our cash flows for the ~~nine~~three months ended ~~September~~March 3031, ~~2023~~2024 and ~~2022~~2023:

	Nine Months EndedSeptember 30,
	Three Months EndedMarch 31,
(in thousands)	~~2023~~2024			~~2022~~2023
Net cash used in operating activities	$	(1,~~227~~314	)	$	(~~1,557~~356	)
Net cash (used in) provided by investing activities		(12,517	)		445
Net cash provided by investing activities		228,000			139
Net cash provided by financing activities		~~388~~1,485			—179
Net decrease in cash and cash equivalents	$	(13,356	)	$	(1,112	)
Net increase (decrease) in cash and cash equivalents	$	228,171		$	(38	)

Operating activities

Cash used in operating activities ofwas $1.23 million during the ~~nine~~three months ended ~~September~~March 3031, ~~2023~~2024, of which $0.2 million was used by continuing operations and $1.1 million was used by discontinued operations. The cash used in operating activities was primarily a result of our $0.94 million net loss from continuing operations. The net loss from continuing operations was offset by stock-based compensation expense of $0.1 million, ~~and~~a ~~also~~decrease ~~adjusted~~in byprepaid ~~$0.1~~expenses ~~million~~and ~~gain~~other oncurrent ~~the~~assets ~~sale~~ of ~~in-process research and development,~~ $0.21 million ~~of accretion on short-term investment~~ and aan ~~decrease~~increase in accounts payable, accrued expenses and other of $0.1 million. The net loss from continuing operations was also adjusted by $0.1 million of accretion on short-term investments.

Cash used in operating activities of $10.64 million during the ~~nine~~three months ended ~~September~~March 3031, ~~2022~~2023 was primarily a result of our $10.13 million net loss from operations. The net loss was ~~offset~~adjusted by ~~stock-based compensation expense of~~ $0.1 million, ~~and also adjusted by $0.4 million~~ gain on the sale of in-process research and development, ~~and~~ a ~~net~~ decrease in accounts payable, accrued expenses and other of $0.1 million and offset by a net decrease in prepaid expenses and other current assets of $0.2 million.

Investing activities

Cash ~~used~~provided inby investing activities of $12228.50 million during the ~~nine~~three months ended ~~September~~March 3031, ~~2023,~~2024 was primarily due to ~~purchases~~milestone ofpayments ~~short-term~~relating ~~investments~~to the sale of the commercial business totaling $15225.60 million, ~~offset~~also bydue to proceeds from maturity of short- term ~~investment~~investments of $3.0 million ~~and $0~~.~~1 million net proceeds from the sale of in-process research and development.~~

Cash provided by investing activities of $0.41 million during the ~~nine~~three months ended ~~September~~March 3031, ~~2022,~~2023 was due to ~~net~~ proceeds from the sale of in-process research and development.

Financing activities

Cash provided by financing activities of $1.5 million and $0.42 million during the ~~nine~~three months ended ~~September~~March 3031, 2024 and 2023 was due to proceeds from the exercise of stock options. ~~There was no cash provided by or used in financing activities during the nine months ended September 30, 2022.~~

Funding requirements

We have incurred significant expenses and operating losses to date. On May 30, 2019, we announced the completion of our review of strategic alternatives, following which our board of directors implemented a series of measures designed to extend our cash runway into 2027 and preserve our ability to capture the potential milestone payments resulting from the Ipsen sale. In connection with that announcement, we discontinued the discovery efforts on our remaining preclinical programs and implemented a reduction in headcount resulting in the termination of all remaining employees as of July 12, 2019. ~~Our~~On May 10, 2024, our stockholders approved a Plan of Dissolution whereby we will cease operations and dissolve in accordance with Delaware law. Stockholders of record on May 10, 2024 will receive a one-time liquidating dividend of $15.10 per share, which dividend is expected to be paid on or around May 17. Thereafter, we intend to transfer any remaining rights to any potential future ~~capital~~milestone ~~requirements~~payments, as described below, from Ipsen Pharmaceuticals or Elevation Oncology to a liquidating trust. Currently, we have no expectation that any future milestone payments will ~~depend~~occur. If any future milestone payments were received, they would be distributed to stockholders of record as of May 10, 2024. Following the stockholders’ meeting, we expect to delist from trading on ~~many~~NASDAQ ~~factors~~on or around May 15, ~~including:~~2024 and to terminate its registration as a reporting company under the Securities Exchange Act of 1934, as amended.

the timing and amount of potential milestone payments related to ONIVYDE that we may receive from Ipsen;

the timing and amount of potential milestone payments that we may receive from Elevation;

the timing and amount of any special dividend to our stockholders that our board of directors may declare;

the timing and amount of general and administrative expenses required to continue to operate our company;

the extent to which we owe any taxes for current, future or prior periods, including as a result of any audits by taxing authorities;

the extent to which we invest in any future research or development activities of our product candidates;

the costs of preparing, filing and prosecuting patent applications and maintaining, enforcing and defending intellectual property-related claims;

the extent to which we acquire or invest in businesses, products and technologies; and

the costs associated with operating as a public company and maintaining compliance with exchange listing and SEC requirements.

We do not believe that we will be able to raise a material amount of capital through the sale of our equity securities or debt financing. Rather, our goal is to judiciously expend our remaining cash until such time, if ever, as we receive additional milestone payments from Ipsen and Elevation. There can be no assurance as to the timing, terms or consummation of any financing. We do not have any committed external sources of funds. To the extent that we raise additional capital through the sale of equity 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 stockholders. Debt financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends. If we raise additional funds through arrangements with third parties, we may have to relinquish valuable rights to our future revenue streams or product candidates.

Contractual Obligations and Commitments

There were no material changes to our contractual obligations and commitments described under Management’s Discussion and Analysis of Financial Condition and Results of Operations in our Annual Report on Form 10-K for the year ended December 31, ~~2022~~2023, as filed with the SEC on March 97, ~~2023~~2024.

Off-Balance Sheet Arrangements

We did not have during the periods presented, and we do not currently have, any off-balance sheet arrangements, as defined under SEC rules.

Recent Accounting Pronouncements

See Note 78, “Recent Accounting Pronouncements,” in the accompanying notes to the condensed consolidated financial statements for a full description of recent accounting pronouncements.

Item 3. Quantitative and Qualitative Disclosures About Market Risk.

We invest in money market funds, ~~and~~ U.S. Treasury Bills and U.S. Treasury Notes. The goals of our investment policy are preservation of capital, fulfillment of liquidity needs and fiduciary control of cash and investments. We also seek to maximize income from our investments without assuming significant risk.

Our primary exposure to market risk is interest income sensitivity, which is affected by changes in the general level of interest rates, particularly because our investments are money market funds. Due to the short-term duration of our investment portfolio and the low risk profile of our investments, an immediate 10% change in interest rates would not have a material effect on the fair market value of our portfolio. We have the ability and intention to hold our investments until maturity, and therefore, we would not expect our operating results or cash flows to be affected to any significant degree by the effect of a sudden change in market interest rates on our investment portfolio.

We do not currently have any auction rate or mortgage-backed securities. We do not believe our cash and cash equivalents and short-term investments have significant risk of default or liquidity, however we cannot provide absolute assurance that in the future our investments will not be subject to adverse changes in market value.

Item 4. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our principal executive and financial officer, evaluated the effectiveness of our disclosure controls and procedures as of ~~September~~March 3031, ~~2023~~2024. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of ~~September~~March 3031, ~~2023~~2024, our principal executive and financial officer concluded that, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level.

Changes in Internal Control Over Financial Reporting

No change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) occurred during the ~~nine~~three months ended ~~September~~March 3031, ~~2023~~2024 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

PART II

OTHER INFORMATION

Item 1. Legal Proceedings

None.

Item 1A. Risk Factors.

In addition to the other information set forth in this Quarterly Report on Form 10-Q, you should carefully consider the factors discussed under the caption “Risk Factors” that appear in Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2022, which was filed with the SEC on March 9, 2023 (the “2022 Annual Report on Form 10-K”) and our quarterly report on Form 10-Q for the quarter ended June 30, 2023, which was filed with the SEC on August 3, 2023 (the “2023 Second Quarter 10-Q”)None. ~~There have been no material changes from the risk factors previously disclosed in the 2022 Annual Report on Form 10-K and the 2023 Second Quarter 10-Q.~~

Item 2. Unregistered Sale of Equity Securities and Use of Proceeds

None.

Item 3. Default Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

Dividends and Potential Future Payments

WeOn doMay ~~not~~10, ~~currently~~2024, ~~intend~~our tostockholders ~~pay~~approved ~~any~~a ~~regular~~Plan ~~cash~~of ~~dividends~~Dissolution inwhereby ~~the~~we ~~foreseeable~~will ~~future~~cease ~~unless~~operations and ~~until~~dissolve wein accordance with Delaware law. Stockholders of record on May 10, 2024 will receive a one-time liquidating dividend of $15.10 per share, which dividend is expected to be paid on or around May 17. Thereafter, we intend to transfer any remaining rights to any potential future milestone payments, as described below, from Ipsen Pharmaceuticals or Elevation Oncology to a liquidating trust. Currently, we have no expectation that any future milestone payments will occur. If any future milestone payments were received, they would be distributed to stockholders of record as of May 10, 2024. Following the stockholders’ meeting, we expect to delist from trading on NASDAQ on or around May 15, 2024 and to terminate its registration as a reporting company under the Securities Exchange Act of 1934, as amended.

Item 6. Exhibits.

ExhibitNumber		Description of Exhibit
31.1*		Certification of Principal Executive Officer pursuant to Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2*		Certification of Principal Financial Officer pursuant to Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1+		Certification of Principal Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2+		Certification of Principal Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS*		Inline XBRL Instance Document
101.SCH*		Inline XBRL Taxonomy Extension Schema Document
101.CAL*		Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF*		Inline XBRL Taxonomy Extension Definition Linkbase Document
101.LAB*		Inline XBRL Taxonomy Extension Label Linkbase Database
101.PRE*		Inline XBRL Taxonomy Extension Presentation Linkbase Document
104*		Cover Page Interactive Data File (embedded within the Inline XBRL document)

* Filed herewith.

+ Furnished herewith.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	MERRIMACK PHARMACEUTICALS, INC.
Date: November 2, 2023	By:	/s/ Gary L. Crocker
Date: May 15, 2024	By:	/s/ Gary L. Crocker
		Gary L. Crocker
		President
		(Principal Financial Officer)

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