Exhibit 3.2

Fourth Amended and Restated Bylaws

89bio, Inc.

a Delaware corporation

ARTICLE I

Offices

Section 1.1. The registered office of 89bio, Inc., a Delaware corporation (the “Corporation”), shall be in the County of New Castle, State of Delaware.

Section 1.2. The Corporation may also have offices at such other places both within and without the State of Delaware as the Board of Directors may from time to time determine or the business of the Corporation may require.

ARTICLE II

Stockholders Meetings

Section 2.1. Annual Meetings. An annual meeting of stockholders shall be held for the election of directors and the transaction of such other business as may properly be brought before the meeting in accordance with these Bylaws at such date, time and place, if any, as may be fixed by resolution of the Board of Directors of the Corporation from time to time. The Board of Directors may, in its sole discretion, determine that the meeting shall not be held at any place, but shall be held solely by means of remote communication, subject to such guidelines and procedures as the Board of Directors may adopt, as permitted by applicable law.

Section 2.2. Special Meetings. Special meetings of stockholders for any purpose or purposes may be called at any time only by the Chairman of the Board, if any, or pursuant to a resolution approved by a majority of the whole Board of Directors or by a committee of the Board of Directors authorized to call such meetings and by no other person. The Board of Directors may, in its sole discretion, determine that the special meeting shall not be held at any place, but shall be held solely by means of remote communication, subject to such guidelines and procedures as the Board of Directors may adopt, as permitted by applicable law. The business transacted at a special meeting of stockholders shall be limited solely to matters relating to the purpose or purposes stated in the Corporation’s notice of meeting.

Section 2.3. Notice of Meetings. A written notice of each annual or special meeting of stockholders shall be given stating the place, if any, date and time of the meeting, the means of remote communications, if any, by which stockholders and proxyholders may be deemed to be present in person and vote at such meeting and, in the case of a special meeting, the purpose or purposes for which the meeting is called. Unless otherwise provided by law, the Certificate of Incorporation or these Bylaws, such notice of meeting shall be given not less than ten nor more than 60 days before the date of the meeting to each stockholder of record entitled to vote at such meeting, personally, by mail or, to the extent and in the manner permitted by applicable law, by electronic facsimile or internet transmission; provided, however, a stockholder may direct the Corporation, in a writing delivered to the Secretary of the Corporation, to not send any notices of meeting by electronic or other transmission, and agrees that if such stockholder provides the Corporation with an internet address at which the stockholder can receive electronic communications the Corporation may send all such notices to such internet address unless the stockholder advises the Corporation in writing of a change in address or that such stockholder no longer is willing to accept delivery of notices of meetings through electronic transmission. If mailed, such notice shall be deemed to be given when deposited in the mail, postage prepaid, directed to the stockholder at such stockholder’s address as it appears on the records of the Corporation.

Fourth Amended and Restated Bylaws of 89bio, Inc.

Section 2.4. Adjournments. Any annual or special meeting of stockholders may be adjourned from time to time to reconvene at the same or some other place, if any, and notice need not be given of any such adjourned meeting if the date, time and place, if any, thereof and the means of remote communication, if any, by which stockholders and proxyholders may be deemed present in person and vote at such adjourned meeting are announced at the meeting at which the adjournment is taken. At the adjourned meeting any business may be transacted which might have been transacted at the original meeting. If the adjournment is for more than 30 days, or if after the adjournment a new record date is fixed for the adjourned meeting, a notice of the adjourned meeting shall be given to each stockholder of record entitled to vote at the adjourned meeting in accordance with Section 2.3.

Section 2.5. Quorum. Except as otherwise provided by law, the Certificate of Incorporation or these Bylaws, the presence in person or by proxy of the holders of stock having a majority of the votes which could be cast by the holders of all outstanding stock entitled to vote at the meeting shall constitute a quorum at each meeting of stockholders. In the absence of a quorum, the stockholders so present may, by the affirmative vote of the holders of stock having a majority of the votes which could be cast by all such holders, adjourn the meeting from time to time in the manner provided in Section 2.4 of these Bylaws until a quorum is present. If a quorum is present when a meeting is convened, the subsequent withdrawal of stockholders, even though less than a quorum remains, shall not affect the ability of the remaining stockholders lawfully to transact business.

Section 2.6. Conduct; Remote Communication.

(a) Meetings of stockholders shall be presided over by the Chairman of the Board, if any, or if there is none or in his or her absence, by the President, or in his or her absence, by a chairman designated by the Board of Directors, or in the absence of such designation by a chairman chosen at the meeting. The Secretary shall act as secretary of the meeting, but in his or her absence the chairman of the meeting may appoint any person to act as secretary of the meeting.

(b) If authorized by the Board of Directors in accordance with these Bylaws and applicable law, stockholders and proxyholders not physically present at a meeting of stockholders may, by means of remote communication, (1) participate in a meeting of stockholders and (2) be deemed present in person and vote at a meeting of stockholders, whether such meeting is to be held at a designated place or solely by means of remote communication, provided that (i) the Corporation shall implement reasonable measures to verify that each person deemed present and permitted to vote at the meeting by means of remote communication is a stockholder or proxyholder, (ii) the Corporation shall implement reasonable measures to provide such stockholders and proxyholders a reasonable opportunity to participate in the meeting and to vote on matters submitted to the stockholders, including an opportunity to read or hear the proceedings of the meeting substantially concurrently with such proceedings, and (iii) if any stockholder or proxyholder votes or takes other action at the meeting by means of remote communication, a record of such vote or other action shall be maintained by the Corporation.


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Section 2.7. Voting.

(a) Except as otherwise provided by the Certificate of Incorporation, each stockholder entitled to vote at any meeting of stockholders shall be entitled to one vote for each share of stock held by such stockholder which has voting power on the matter in question.

(b) Voting at meetings of stockholders need not be by written ballot and need not be conducted by inspectors of election unless so determined by the holders of stock having a majority of the votes which could be cast by the holders of all outstanding stock entitled to vote which are present in person or by proxy at such meeting. Unless otherwise provided in the Certificate of Incorporation, directors shall be elected by a plurality of the votes cast in the election of directors. Each other question shall, unless otherwise provided by law, the Certificate of Incorporation or these Bylaws, be decided by the vote of the holders of stock having a majority of the votes which could be cast by the holders of all stock entitled to vote on such question which are present in person or by proxy at the meeting.

(c) Stock of the Corporation standing in the name of another corporation and entitled to vote may be voted by such officer, agent or proxy as the Bylaws or other internal regulations of such other corporation may prescribe or, in the absence of such provision, as the board of directors or comparable body of such other corporation may determine.

(d) Stock of the Corporation standing in the name of a deceased person, a minor, an incompetent or a debtor in a case under Title 11, United States Code, and entitled to vote may be voted by an administrator, executor, guardian, conservator, debtor-in-possession or trustee, as the case may be, either in person or by proxy, without transfer of such shares into the name of the official or other person so voting.

(e) A stockholder whose voting stock of the Corporation is pledged shall be entitled to vote such stock unless on the transfer records of the Corporation the pledgor has expressly empowered the pledgee to vote such shares, in which case only the pledgee, or such pledgee’s proxy, may represent such shares and vote thereon.

(f) If voting stock is held of record in the names of two or more persons, whether fiduciaries, members of a partnership, joint tenants, tenants in common, tenants by the entirety or otherwise, or if two or more persons have the same fiduciary relationship respecting the same shares, unless the Secretary is given written notice to the contrary and is furnished with a copy of the instrument or order appointing them or creating the relationship wherein it is so provided, their acts with respect to voting shall have the following effect: (i) if only one votes, such act binds all; (ii) if more than one vote, the act of the majority so voting binds all; and (iii) if more than one votes, but the vote is evenly split on any particular matter each faction may vote such stock proportionally, or any person voting the shares, or a beneficiary, if any, may apply to the Court of Chancery of the State of Delaware or such other court as may have jurisdiction to appoint an additional person to act with the persons so voting the stock, which shall then be voted as determined by a majority of such persons and the person appointed by such court. If the instrument so filed shows that any such tenancy is held in unequal interests, a majority or even split for the purpose of this subsection shall be a majority or even split in interest.

(g) Stock of the Corporation belonging to the Corporation, or to another corporation a majority of the shares entitled to vote in the election of directors of which are held by the Corporation, shall not be voted at any meeting of stockholders and shall not be counted in the total number of outstanding shares for the purpose of determining whether a quorum is present. Nothing in this Section 2.7 shall limit the right of the Corporation to vote shares of stock of the Corporation held by it in a fiduciary capacity.


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Section 2.8. Proxies.

(a) Each stockholder entitled to vote at a meeting of stockholders may authorize another person or persons to act for such stockholder by proxy filed with the Secretary before or at the time of the meeting. No such proxy shall be voted or acted upon after three years from its date, unless the proxy provides for a longer period. A duly executed proxy shall be irrevocable if it states that it is irrevocable and if, and only as long as, it is coupled with an interest sufficient in law to support an irrevocable power. A stockholder may revoke any proxy which is not irrevocable by attending the meeting and voting in person or by filing with the Secretary an instrument in writing revoking the proxy or another duly executed proxy bearing a later date.

(b) A stockholder may authorize another person or persons to act for such stockholder as proxy (i) by executing a writing authorizing such person or persons to act as such, which execution may be accomplished by such stockholder or such stockholder’s authorized officer, director, partner, employee or agent (or, if the stock is held in a trust or estate, by a trustee, executor or administrator thereof) signing such writing or causing his or her signature to be affixed to such writing by any reasonable means, including, but not limited to, facsimile signature, or (ii) by transmitting or authorizing the transmission of a telegram, cablegram or other means of electronic transmission (a “Transmission”) to the person who will be the holder of the proxy or to a proxy solicitation firm, proxy support service organization or like agent duly authorized by the person who will be the holder of the proxy to receive such Transmission; provided that any such Transmission must either set forth or be submitted with information from which it can be determined that such Transmission was authorized by such stockholder.

(c) Any inspector or inspectors appointed shall examine Transmissions to determine if they are valid. If no inspector or inspectors are so appointed, the Secretary or such other person or persons as shall be appointed from time to time by the Board of Directors shall examine Transmissions to determine if they are valid. If it is determined that a Transmission is valid, the person or persons making that determination shall specify the information upon which such person or persons relied. Any copy, facsimile telecommunication or other reliable reproduction of such a writing or Transmission may be substituted or used in lieu of the original writing or Transmission for any and all purposes for which the original writing or Transmission could be used; provided that such copy, facsimile telecommunication or other reproduction shall be a complete reproduction of the entire original writing or Transmission.

Section 2.9. Fixing Date of Determination of Stockholders of Record.

(a) In order that the Corporation may determine the stockholders entitled (i) to notice of or to vote at any meeting of stockholders or any adjournment thereof, (ii) to receive payment of any dividend or other distribution or allotment of any rights, (iii) to exercise any rights in respect of any change, conversion or exchange of stock, (iv) to express consent to corporate action in writing without a meeting, or (v) to take, receive or participate in any other action, the Board of Directors may fix a record date, which shall not be earlier than the date upon which the resolution fixing the record date is adopted by the Board of Directors and which (1) in the case of a determination of stockholders entitled to notice of or to vote at any meeting of stockholders or adjournment thereof, shall, unless otherwise required by law, be not more than 60 nor less than


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ten days before the date of such meeting; (2) in the case of a determination of stockholders entitled to express consent to corporate action in writing without a meeting, shall be not more than ten days after the date upon which the resolution fixing the record date is adopted by the Board of Directors; and (3) in the case of any other action, shall be not more than 60 days before such action.

(b) If no record date is fixed, (i) the record date for determining stockholders entitled to notice of or to vote at a meeting of stockholders shall be at the close of business on the day next preceding the day on which notice is given, or, if notice is waived, at the close of business on the day next preceding the day on which the meeting is held; (ii) the record date for determining stockholders entitled to express consent to corporate action in writing without a meeting when no prior action of the Board of Directors is required by law, shall be the first date on which a signed written consent setting forth the action taken or proposed to be taken is delivered to the Corporation in accordance with applicable law, or, if prior action by the Board of Directors is required by law, shall be at the close of business on the day on which the Board of Directors adopts the resolution taking such prior action; and (iii) the record date for determining stockholders for any other purpose shall be at the close of business on the day on which the Board of Directors adopts the resolution relating thereto.

(c) A determination of stockholders of record entitled to notice of or to vote at a meeting of stockholders shall apply to any adjournment of the meeting, but the Board of Directors may fix a new record date for the adjourned meeting.

Section 2.10. List of Stockholders Entitled to Vote. The Secretary shall prepare, at least ten days before every meeting of stockholders, a complete list of the stockholders entitled to vote at the meeting, arranged in alphabetical order, and showing the address and the number of shares registered in the name of each stockholder. Such list shall be open to the examination of any stockholder, for any purpose germane to the meeting for a period of at least ten days prior to the meeting: (i) on a reasonably accessible electronic network, provided that the information required to gain access to such list is provided with the notice of the meeting, or (ii) during ordinary business hours, at the principal place of business of the Corporation. In the event that the Corporation determines to make the list available on an electronic network, the Corporation may take reasonable steps to ensure that such information is available only to stockholders of the Corporation. If the meeting is to be held at a place, the list shall also be produced and kept at the time and place of the meeting during the whole time thereof and may be inspected by any stockholder who is present. If the meeting is to be held solely by means of remote communication, the list shall be open to the examination of any stockholder during the whole time thereof on a reasonably accessible electronic network, and the information required to access such list shall be provided with the notice of the meeting. The stock ledger shall be the only evidence as to who are the stockholders entitled to examine the stock ledger, the list of stockholders or the books of the Corporation, or to vote in person or by proxy at any meeting of stockholders.

Section 2.11. Action By Consent of Stockholders.

(a) Unless the power of stockholders to act by consent without a meeting is restricted or eliminated by the Certificate of Incorporation, any action required or permitted to be taken at any annual or special meeting of stockholders may be taken without a meeting, without prior notice and without a vote, if a consent in writing, setting forth the action so taken, is signed by the holders of outstanding stock having not less than the minimum number of votes that would be necessary to authorize or take such action at a meeting at which all shares entitled to vote on such action were present and voted.


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(b) Every written consent shall bear the date of signature of each stockholder (or his, her or its proxy) signing such consent. Prompt notice of the taking of corporate action without a meeting of stockholders by less than unanimous written consent shall be given to those stockholders who have not consented in writing and who, if action had been taken at a meeting, would have been entitled to notice of the meeting if the record date for such meeting had been the date that written consents signed by a sufficient number of persons to authorize or take the action were delivered to the Corporation in the manner required by this Section 2.11. All such written consents shall be delivered to the Corporation at its registered office in the State of Delaware, at its principal place of business or to the Secretary. Delivery made to the Corporation’s registered office shall be made by hand or by certified or registered mail, return receipt requested.

(c) A telegram, cablegram or other electronic transmission consenting to an action to be taken and transmitted by a stockholder or proxyholder, or by a person or persons authorized to act for a stockholder or proxyholder, shall be deemed to be written, signed and dated for the purposes of these Bylaws, provided that any such telegram, cablegram or other electronic transmission sets forth or is delivered with information from which the Corporation can determine (A) that the telegram, cablegram or other electronic transmission was transmitted by the stockholder or proxyholder or by a person or persons authorized to act for the stockholder or proxyholder and (B) the date on which such stockholder or proxyholder or authorized person or persons transmitted such telegram, cablegram or electronic transmission. Any consent by means of telegram, cablegram or electronic transmission shall be deemed to have been signed on the date on which it was transmitted. No consent given by telegram, cablegram or other electronic transmission shall be deemed to have been delivered until such consent is reproduced in paper form and until such paper form shall be delivered to the Corporation by delivery to its registered office in the State of Delaware, at its principal place of business or to the Secretary. Delivery made to the Corporation’s registered office shall be made by hand or by certified or registered mail, return receipt requested. Notwithstanding the foregoing limitations on delivery, consents given by telegram, cablegram or other electronic transmission may be otherwise delivered to the principal place of business of the Corporation or to the Secretary if, to the extent and in the manner provided by resolution of the Board of Directors of the Corporation.

(d) No written consent shall be effective to authorize or take the corporate action referred to therein unless, within 60 days of the earliest dated written consent delivered to the Corporation in the manner required by this Section 2.11, written consents signed by a sufficient number of persons to authorize or take such action are delivered to the Corporation at its registered office in the State of Delaware, at its principal place of business or to the Secretary. All such written consents shall be filed with the minutes of proceedings of the stockholders, and actions authorized or taken under such written consents shall have the same force and effect as those authorized or taken pursuant to a vote of the stockholders at an annual or special meeting.


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ARTICLE III

Board of Directors

Section 3.1. Number. The initial Board of Directors shall consist of two directors. Thereafter, the number of directors may be amended from time to time by resolution adopted by affirmative vote of a majority of the whole Board of Directors; provided that no such amendment may shorten the term of any incumbent director.

Section 3.2. Election; Resignation; Vacancies.

(a) Unless the Certificate of Incorporation or an amendment to these Bylaws adopted by the stockholders provides for a Board of Directors divided into two or three classes, at each annual meeting of stockholders the stockholders shall elect directors each of whom shall hold office until the next annual meeting of stockholders and the election and qualification of his or her successor, or until his or her earlier death, resignation or removal. If the Board of Directors is divided into classes, at each annual meeting at which the term of office of a class of directors expires, the stockholders shall elect directors of such class each to hold office until the annual meeting at which the terms of office of such class of directors expire and the election and qualification of his or her successor, or until his or her earlier death, resignation or removal.

(b) Any director may resign at any time by giving written notice to the Chairman of the Board, if any, the President or the Secretary. Unless otherwise stated in a notice of resignation, it shall take effect when received by the officer to whom it is directed, without any need for its acceptance.

(c) Any newly created directorship or any vacancy occurring in the Board of Directors for any reason may be filled by a majority of the remaining directors (excluding any director elected by any class or series of preferred stock), although less than a quorum, or by a plurality of the votes cast in the election of directors at a meeting of stockholders. Each director elected to replace a former director shall hold office until the expiration of the term of office of the director whom he or she has replaced and the election and qualification of his or her successor, or until his or her earlier death, resignation or removal. A director elected to fill a newly created directorship shall serve until the next annual meeting of stockholders and the election and qualification of his or her successor, or until his or her earlier death, resignation or removal.

Section 3.3. Regular Meetings. Unless otherwise determined by the Board of Directors, a regular annual meeting of the Board of Directors shall be held, without call or notice, immediately after and, if the annual meeting of stockholders is held at a place, at the same place as the annual meeting of stockholders, for the purpose of organizing the Board of Directors, electing officers and transacting any other business that may properly come before such meeting. If the stockholders shall elect the directors by written consent of stockholders as permitted by Section 2.11 of these Bylaws, a special meeting of the Board of Directors shall be called as soon as practicable after such election for the purposes described in the preceding sentence. Additional regular meetings of the Board of Directors may be held without call or notice at such times as shall be fixed by resolution of the Board of Directors.

Section 3.4. Special Meetings. Special meetings of the Board of Directors may be called by the Chairman of the Board, if any, the President, the Secretary or by any member of the Board of Directors. Notice of an in-person special meeting of the Board of Directors shall be given by the person or persons calling the meeting at least twenty-four hours before the special meeting. Notice of a special telephonic meeting of the Board of Directors shall be given by the person or persons calling the meeting at least two hours before the special meeting. The purpose or purposes of a special meeting need not be stated in the call or notice.


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Section 3.5. Organization. Meetings of the Board of Directors shall be presided over by the Chairman of the Board, if any, or if there is none or in his or her absence, by the President, or in his or her absence, by a chairman chosen at the meeting. The Secretary shall act as secretary of the meeting, but in his or her absence the chairman of the meeting may appoint any person to act as secretary of the meeting. A majority of the directors present at a meeting, whether or not they constitute a quorum, may adjourn such meeting to any other date, time or place without notice other than announcement at the meeting.

Section 3.6. Quorum; Vote Required for Action. At all meetings of the Board of Directors a majority of the whole Board of Directors shall constitute a quorum for the transaction of business. Unless the Certificate of Incorporation or these Bylaws otherwise provide, the vote of a majority of the directors present at a meeting at which a quorum is present shall be the act of the Board of Directors.

Section 3.7. Committees. The Board of Directors may, by resolution passed by a majority of the whole Board of Directors, designate one or more committees, each committee to consist of one or more directors of the Corporation. The Board of Directors may designate one or more directors as alternate members of any committee, who may replace any absent or disqualified member at any meeting of the committee. In the absence or disqualification of a member of the committee, the member or members present at any meeting and not disqualified from voting, whether or not a quorum, may unanimously appoint another member of the Board of Directors to act at the meeting in place of any such absent or disqualified member. Any such committee, to the extent permitted by law and provided in these Bylaws or in the resolution of the Board of Directors designating such committee, or an amendment to such resolution, shall have and may exercise all the powers and authority of the Board of Directors in the management of the business and affairs of the Corporation, and may authorize the seal of the Corporation to be affixed to all papers which may require it.

Section 3.8. Telephonic Meetings. Directors, or any committee of directors designated by the Board of Directors, may participate in a meeting of the Board of Directors or such committee by means of conference telephone or other communications equipment by means of which all persons participating in the meeting can hear each other, and participation in a meeting pursuant to this Section 3.8 shall constitute presence in person at such meeting.

Section 3.9. Informal Action by Directors. Unless otherwise restricted by the Certificate of Incorporation or these Bylaws, any action required or permitted to be taken at any meeting of the Board of Directors, or of any committee thereof, may be taken without a meeting if all members of the Board of Directors or such committee, as the case may be, consent thereto in writing (which may be in counterparts) or by electronic transmission, and the written consent or consents or electronic transmission or transmissions are filed with the minutes of proceedings of the Board of Directors or such committee. Such filing shall be made in paper form if the minutes of the Corporation are maintained in paper form and shall be in electronic form if the minutes are maintained in electronic form.

Section 3.10. Committee Rules. Unless the Board of Directors otherwise provides, each committee designated by the Board of Directors may make, alter and repeal rules for the conduct of its business. In the absence of such rules each committee shall conduct its business in the same manner as the Board of Directors conducts its business pursuant to this Article III of these Bylaws.


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Section 3.11. Reliance upon Records. Every director, and every member of any committee of or designated by the Board of Directors, shall, in the performance of his or her duties, be fully protected in relying in good faith upon the records of the Corporation and upon such information, opinions, reports or statements presented to the Corporation by any of its officers or employees, or committees of the Board of Directors, or by any other person as to matters the director or member reasonably believes are within such other person’s professional or expert competence and who has been selected with reasonable care by or on behalf of the Corporation, including, but not limited to, such records, information, opinions, reports or statements as to the value and amount of the assets, liabilities and/or net profits of the Corporation, or any other facts pertinent to the existence and amount of surplus or other funds from which dividends might properly be declared and paid, or with which the Corporation’s capital stock might properly be purchased or redeemed.

Section 3.12. Interested Directors. A director who is directly or indirectly a party to a contract or transaction with the Corporation, or is a director or officer of or has a financial interest in any other corporation, partnership, association or other organization which is a party to a contract or transaction with the Corporation, may be counted in determining whether a quorum is present at any meeting of the Board of Directors or a committee thereof at which such contract or transaction is considered or authorized, and such director may participate in such meeting and vote on such authorization to the extent permitted by applicable law, including Section 144 of the General Corporation Law of the State of Delaware (as the same exists or may hereafter be amended from time to time, the “DGCL”).

Section 3.13. Compensation. Unless otherwise restricted by the Certificate of Incorporation, the Board of Directors shall have the authority to fix the compensation of directors. The directors shall be paid their reasonable expenses, if any, of attendance at each meeting of the Board of Directors or a committee thereof and may be paid a fixed sum for attendance at each such meeting and an annual retainer or salary for services as a director or committee member. No such payment shall preclude any director from serving the Corporation in any other capacity and receiving compensation therefor.

ARTICLE IV

Officers

Section 4.1. Executive Officers; Election; Qualification; Term of Office. The Board of Directors shall elect a President and may, if it so determines, elect a Chairman of the Board from among its members. The Board of Directors shall also elect a Secretary and may elect one or more Vice Presidents, one or more Assistant Secretaries, a Chief Financial Officer and one or more Assistant Treasurers. Any number of offices may be held by the same person. Each officer shall hold office until the first meeting of the Board of Directors after the annual meeting of stockholders next succeeding his or her election, and until his or her successor is elected and qualified or until his or her earlier death, resignation or removal.

Section 4.2. Resignation; Removal; Vacancies. Any officer may resign at any time by giving written notice to the Chairman of the Board, if any, the President or the Secretary. Unless otherwise stated in a notice of resignation, it shall take effect when received by the officer to whom it is directed, without any need for its acceptance. The Board of Directors may remove any officer with or without cause at any time, but such removal shall be without prejudice to the contractual rights of such officer, if any, with the Corporation. A vacancy occurring in any office of the Corporation may be filled for the unexpired portion of the term thereof by the Board of Directors at any regular or special meeting.


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Section 4.3. Powers and Duties of Executive Officers. The officers of the Corporation shall have such powers and duties in the management of the Corporation as may be prescribed by the Board of Directors and, to the extent not so provided, as generally pertain to their respective offices, subject to the control of the Board of Directors. The Board of Directors may require any officer, agent or employee to give security for the faithful performance of his or her duties.

Section 4.4. President. The President of the Corporation shall be the chief executive officer of the Corporation and shall in general supervise and control all of the business affairs of the Corporation, subject to the direction of the Board of Directors. The President may execute, in the name and on behalf of the Corporation, any deeds, mortgages, bonds, contracts or other instruments which the Board of Directors or a committee thereof has authorized to be executed, except in cases where the execution shall have been expressly delegated by the Board of Directors or a committee thereof to some other officer or agent of the Corporation.

Section 4.5. Secretary. In addition to such other duties, if any, as may be assigned to the Secretary by the Board of Directors, the Chairman of the Board, if any, or the President, the Secretary shall (i) keep the minutes of proceedings of the stockholders, the Board of Directors and any committee of the Board of Directors in one or more books provided for that purpose; (ii) see that all notices are duly given in accordance with the provisions of these Bylaws or as required by law; (iii) be the custodian of the records and seal of the Corporation; (iv) affix or cause to be affixed the seal of the Corporation or a facsimile thereof, and attest the seal by his or her signature, to all certificates for shares of stock of the Corporation and to all other documents the execution of which under seal is authorized by the Board of Directors; and (v) unless such duties have been delegated by the Board of Directors to a transfer agent of the Corporation, keep or cause to be kept a register of the name and address of each stockholder, as the same shall be furnished to the Secretary by such stockholder, and have general charge of the stock transfer records of the Corporation.

Section 4.6. Chief Financial Officer. The Chief Financial Officer shall perform the duties designated by the President and shall keep and maintain, or cause to be kept and maintained, adequate and correct accounts of the properties and business transactions of the Corporation, including accounts of its assets, liabilities, receipts, disbursements, gains, losses, capital, surplus and shares. The Chief Financial Officer shall render to the Board of Directors, whenever requested, an account of the financial condition of the Corporation.

ARTICLE V

Stock Certificates and Transfers

Section 5.1. Certificate. Stock of the Corporation may be certificated and every holder of stock shall be entitled to have a certificate signed by or in the name of the Corporation by the Chairman of the Board, if any, or the President or a Vice President, and by the Secretary or an Assistant Secretary, of the Corporation, certifying the number of shares owned by such stockholder in the Corporation. Any or all of the signatures on the certificate may be facsimile, stamp or other imprint. In case any officer, transfer agent, or registrar who has signed or whose facsimile, stamp or other imprint signature has been placed upon a certificate shall have ceased to be such officer, transfer agent or registrar before such certificate is issued, it may be issued by the Corporation with the same effect as if such officer, transfer agent, or registrar continued to be such at the date of issue.

Section 5.2. Lost, Stolen or Destroyed Certificates; Issuance of New Certificates. The Corporation may issue a new certificate for stock in the place of any certificate theretofore issued by it, alleged to have been lost, stolen or destroyed, and the Corporation may require the owner of the lost, stolen or destroyed certificate, or such stockholder’s legal representative, to give the Corporation a bond sufficient to indemnify it against any claim that may be made against it on account of the alleged loss, theft or destruction of any such certificate or the issuance of such new certificate.


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Section 5.3. Transfers of Stock. Upon surrender to the Corporation or the transfer agent of the Corporation of a certificate for stock of the Corporation (if such stock is certificated) duly endorsed or accompanied by proper evidence of succession, assignment or authority to transfer or, if the relevant stock certificate is claimed to have been lost, stolen or destroyed, upon compliance with the provisions of Section 5.2 of these Bylaws, or, if such stock is not certificated, upon delivery of a duly executed and endorsed stock transfer power, and upon payment of applicable taxes with respect to such transfer, and in compliance with any restrictions on transfer applicable to such stock certificate or the shares represented thereby of which the Corporation shall have notice and subject to such rules and regulations as the Board of Directors may from time to time deem advisable concerning the transfer and registration of stock certificates, the Corporation may issue a new certificate or certificates for such stock to the person entitled thereto, cancel the old certificate and, in each case, record the transaction upon its books. Transfers of stock shall be made only on the books of the Corporation by the registered holder thereof or by such holder’s attorney or successor duly authorized as evidenced by documents filed with the Secretary or transfer agent of the Corporation. Whenever any transfer of stock shall be made for collateral security, and not absolutely, it shall be so expressed in the entry of transfer if, when the certificate or certificates representing such stock are presented to the Corporation for transfer, both the transferor and transferee request the Corporation to do so.

Section 5.4. Stockholders of Record. The Corporation shall be entitled to treat the holder of record of any stock of the Corporation as the holder thereof and shall not be bound to recognize any equitable or other claim to or interest in such stock on the part of any other person, whether or not it shall have express or other notice thereof, except as otherwise required by the laws of the State of Delaware.

ARTICLE VI

Notices

Section 6.1. Manner of Notice.

(a) Except as otherwise provided by law, the Certificate of Incorporation or these Bylaws, whenever notice is required to be given to any stockholder, director or member of any committee of the Board of Directors, such notice may be given by (i) personal delivery, (ii) depositing it, in a sealed envelope, in the United States mails, first class, postage prepaid, addressed, (iii) delivering to a company for overnight or second day mail or delivery, (iv) delivering it to a telegraph company, charges prepaid, for transmission, or by transmitting it via telecopier, or (v) any other reliable means permitted by applicable law (including, subject to Section 6.1(b), electronic transmission) to such stockholder, director or member, either at the address of such stockholder, director or member as it appears on the records of the Corporation or, in the case of such a director or member, at his or her business address; and such notice shall be deemed to be given at the time when it is thus personally delivered, deposited, delivered or transmitted, as the case may be. Such requirement for notice shall also be deemed satisfied, except in the case of stockholder meetings, if actual notice is received orally or by other writing by the person entitled thereto as far in advance of the event with respect to which notice is being given as the minimum notice period required by law or these Bylaws.


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(b) Without limiting the foregoing, any notice to stockholders given by the Corporation pursuant to these Bylaws shall be effective if given by a form of electronic transmission consented to by the stockholder to whom the notice is given. Any such consent shall be revocable by the stockholder by written notice to the Corporation and shall also be deemed revoked if (1) the Corporation is unable to deliver by electronic transmission two consecutive notices given by the Corporation in accordance with such consent and (2) such inability becomes known to the Secretary of the Corporation, the transfer agent or other person responsible for the giving of notice; provided, however, that the inadvertent failure to treat such inability as a revocation shall not invalidate any meeting or other action. Notice given by a form of electronic transmission in accordance with these Bylaws shall be deemed given: (i) if by facsimile telecommunication, when directed to a number at which the stockholder has consented to receive notice; (ii) if by electronic mail, when directed to an electronic mail address at which the stockholder has consented to receive notice; (iii) if by a posting on an electronic network, together with separate notice to the stockholder of such specific posting, upon the later of such posting and the giving of such separate notice; and (iv) if by another form of electronic transmission, when directed to the stockholder.

Section 6.2. Dispensation with Notice.

(a) Whenever notice is required to be given by law, the Certificate of Incorporation or these Bylaws to any stockholder to whom (i) notice of two consecutive annual meetings of stockholders, and all notices of meetings of stockholders or of the taking of action by stockholders by written consent without a meeting to such stockholder during the period between such two consecutive annual meetings, or (ii) all, and at least two, payments (if sent by first class mail) of dividends or interest on securities of the Corporation during a 12-month period, have been mailed addressed to such stockholder at the address of such stockholder as shown on the records of the Corporation and have been returned undeliverable, the giving of such notice to such stockholder shall not be required. Any action or meeting which shall be taken or held without notice to such stockholder shall have the same force and effect as if such notice had been duly given. If any such stockholder shall deliver to the Corporation a written notice setting forth the then current address of such stockholder, the requirement that notice be given to such stockholder shall be reinstated.

(b) Whenever notice is required to be given by law, the Certificate of Incorporation or these Bylaws to any person with whom communication is unlawful, the giving of such notice to such person shall not be required, and there shall be no duty to apply to any governmental authority or agency for a license or permit to give such notice to such person. Any action or meeting which shall be taken or held without notice to any such person with whom communication is unlawful shall have the same force and effect as if such notice had been duly given.

Section 6.3. Waiver of Notice. Any written waiver of notice, signed by the person entitled to notice, whether before or after the time stated therein, shall be deemed equivalent to notice. Attendance of a person at a meeting shall constitute a waiver of notice of such meeting, except when the person attends a meeting for the express purpose of objecting, at the beginning of the meeting, to the transaction of any business because the meeting is not lawfully called or convened. Neither the business to be transacted at, nor the purpose of, any regular or special meeting of the stockholders, directors, or members of a committee or directors need be specified in any written waiver of notice.


		Page 12 of 16		Fourth Amended and Restated Bylaws of 89bio, Inc.

ARTICLE VII

Indemnification and Advancement of Expenses

Section 7.1. Right to Indemnification. Each person who was or is a party or is threatened to be made a party to, or was or is otherwise involved in, any action, suit, arbitration, alternative dispute resolution mechanism, investigation, inquiry, judicial, administrative or legislative hearing, or any other threatened, pending or completed proceeding, whether brought by or in the right of the Corporation or otherwise, including any and all appeals, whether of a civil, criminal, administrative, legislative, investigative or other nature (hereinafter a “proceeding”), by reason of the fact that he or she is or was a director or an officer (which means, for purposes of this Article VII, any individual designated by the Board of Directors as an officer for purposes of Section 16 of the Exchange Act) of the Corporation or while a director or officer of the Corporation is or was serving at the request of the Corporation as a director, officer, employee, agent or trustee of another corporation or of a partnership, joint venture, trust or other enterprise, including service with respect to an employee benefit plan (hereinafter an “indemnitee”), or by reason of anything done or not done by him or her in any such capacity, shall be indemnified and held harmless by the Corporation to the fullest extent authorized by the DGCL, as the same exists or may hereafter be amended, against all expense, liability and loss (including attorneys’ fees, judgments, fines, ERISA excise taxes, penalties and amounts paid in settlement by or on behalf of the indemnitee) actually and reasonably incurred by such indemnitee in connection therewith, all on the terms and conditions set forth in this Article VII; provided, however, that, except as otherwise required by law or provided in Section 7.3 with respect to suits to enforce rights under this Article VII, the Corporation shall indemnify any such indemnitee in connection with a proceeding, or part thereof, voluntarily initiated by such indemnitee (including claims and counterclaims, whether such counterclaims are asserted by: (i) such indemnitee; or (ii) the Corporation in a proceeding initiated by such indemnitee) only if such proceeding, or part thereof, was authorized or ratified by the Board of Directors or the Board of Directors otherwise determines that indemnification or advancement of expenses is appropriate

Section 7.2. Right to Advancement of Expenses.

(a) In addition to the right to indemnification conferred in Section 7.1, an indemnitee shall, to the fullest extent permitted by law, also have the right to be paid by the Corporation the expenses (including attorneys’ fees) incurred in defending any proceeding in advance of its final disposition (hereinafter an “advancement of expenses”); provided, however, that an advancement of expenses shall be made only upon delivery to the Corporation of an undertaking (hereinafter an “undertaking”), by or on behalf of such indemnitee, to repay all amounts so advanced if it shall ultimately be determined by final judicial decision of a court of competent jurisdiction from which there is no further right to appeal (hereinafter a “final adjudication”) that such indemnitee is not entitled to be indemnified for such expenses under this Article VII or otherwise.

(b) Notwithstanding the foregoing Section 7.2(a), the Corporation shall not make or continue to make advancements of expenses to an indemnitee if a determination is reasonably made that the facts known at the time such determination is made demonstrate clearly and convincingly that the indemnitee acted in bad faith or in a manner that the indemnitee did not reasonably believe to be in or not opposed to the best interests of the Corporation, or, with respect to any criminal proceeding, that the indemnitee had reasonable cause to believe his or her conduct was unlawful. Such determination shall be made: (i) by the Board of Directors by a majority vote of directors who are not parties to such proceeding, whether or not such majority constitutes a quorum; (ii) by a committee of such directors designated by a majority vote of such directors, whether or not such majority constitutes a quorum; or (iii) if there are no such directors, or if such directors so direct, by independent legal counsel in a written opinion to the Board of Directors, a copy of which shall be delivered to the indemnitee.


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Section 7.3. Right of Indemnitee to Bring Suit. If a request for indemnification under Section 7.1 is not paid in full by the Corporation within 60 days, or if a request for an advancement of expenses under Section 7.2 is not paid in full by the Corporation within 20 days, after a written request has been received by the Secretary of the Corporation, the indemnitee may at any time thereafter bring suit against the Corporation in a court of competent jurisdiction in the State of Delaware seeking an adjudication of entitlement to such indemnification or advancement of expenses. If successful in whole or in part in any such suit, or in a suit brought by the Corporation to recover an advancement of expenses pursuant to the terms of an undertaking, the indemnitee shall be entitled to be paid also the expense of prosecuting or defending such suit to the fullest extent permitted by law. In any suit brought by the indemnitee to enforce a right to indemnification hereunder (but not in a suit brought by the indemnitee to enforce a right to an advancement of expenses) it shall be a defense that the indemnitee has not met any applicable standard of conduct for indemnification set forth in the DGCL. Further, in any suit brought by the Corporation to recover an advancement of expenses pursuant to the terms of an undertaking, the Corporation shall be entitled to recover such expenses upon a final adjudication that the indemnitee has not met any applicable standard of conduct for indemnification set forth in the DGCL. Neither the failure of the Corporation (including its directors who are not parties to such action, a committee of such directors, independent legal counsel or its stockholders) to have made a determination prior to the commencement of such suit that indemnification of the indemnitee is proper in the circumstances because the indemnitee has met the applicable standard of conduct set forth in the DGCL, nor an actual determination by the Corporation (including its directors who are not parties to such action, a committee of such directors, independent legal counsel or its stockholders) that the indemnitee has not met such applicable standard of conduct, shall create a presumption that the indemnitee has not met the applicable standard of conduct or, in the case of such a suit brought by the indemnitee, be a defense to such suit. In any suit brought by the indemnitee to enforce a right to indemnification or to an advancement of expenses hereunder, or brought by the Corporation to recover an advancement of expenses pursuant to the terms of an undertaking, the burden of proving that the indemnitee is not entitled to be indemnified, or to such advancement of expenses, under applicable law, this Article VII or otherwise shall be on the Corporation.

Section 7.4. Non-Exclusivity of Rights. The rights to indemnification and to the advancement of expenses conferred in this Article VII shall not be exclusive of any other right which any person may have or hereafter acquire under any law, agreement, vote of stockholders or disinterested directors, provisions of a certificate of incorporation or bylaws, or otherwise.

Section 7.5. Insurance. The Corporation may maintain insurance, at its expense, to protect itself and any director, officer, employee or agent of the Corporation or another corporation, partnership, joint venture, trust or other enterprise against any expense, liability or loss, whether or not the Corporation would have the power to indemnify such person against such expense, liability or loss under the DGCL.

Section 7.6. Indemnification of Employees and Agents of the Corporation. The Corporation may, to the extent and in the manner permitted by law, and to the extent authorized from time to time, grant rights to indemnification and to the advancement of expenses to any employee or agent of the Corporation.


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Section 7.7. Nature of Rights. The rights conferred upon indemnitees in this Article VII shall be contract rights and such rights shall continue as to an indemnitee who has ceased to be a director or officer and shall inure to the benefit of the indemnitee’s heirs, executors and administrators. Any amendment, alteration or repeal of this Article VII that adversely affects any right of an indemnitee or its successors shall be prospective only and shall not limit or eliminate any such right with respect to any proceeding involving any occurrence or alleged occurrence of any action or omission to act that took place prior to such amendment, alteration or repeal.

Section 7.8. Settlement of Claims. Notwithstanding anything in this Article VII to the contrary, the Corporation shall not be liable to indemnify any indemnitee under this Article VII for any amounts paid in settlement of any proceeding effected without the Corporation’s written consent, which consent shall not be unreasonably withheld.

Section 7.9. Subrogation. In the event of payment under this Article VII, the Corporation shall be subrogated to the extent of such payment to all of the rights of recovery of the indemnitee (excluding insurance obtained on the indemnitee’s own behalf), and the indemnitee shall execute all papers required and shall do everything that may be necessary to secure such rights, including the execution of such documents necessary to enable the Corporation effectively to bring suit to enforce such rights.

Section 7.10. Severability. If any provision or provisions of this Article VII shall be held to be invalid, illegal or unenforceable as applied to any person or entity or circumstance for any reason whatsoever, then, to the fullest extent permitted by law: (a) the validity, legality and enforceability of such provision in any other circumstance and of the remaining provisions of this Article VII (including, without limitation, all portions of any paragraph of this Article VII containing any such provision held to be invalid, illegal or unenforceable, that are not by themselves invalid, illegal or unenforceable) and the application of such provision to other persons or entities or circumstances shall not in any way be affected or impaired thereby; and (b) to the fullest extent possible, the provisions of this Article VII (including, without limitation, all portions of any paragraph of this Article VII containing any such provision held to be invalid, illegal or unenforceable, that are not themselves invalid, illegal or unenforceable) shall be construed so as to give effect to the intent of the parties that the Corporation provide protection to the indemnitee to the fullest extent set forth in this Article VII.

ARTICLE VIII

General

Section 8.1. Fiscal year. The fiscal year of the Corporation shall be determined by resolution of the Board of Directors.

Section 8.2. Seal. The corporate seal, if any, shall have the name of the Corporation inscribed thereon and shall be in such form as may be approved from time to time by the Board of Directors.

Section 8.3. Form of Records. Any records maintained by the Corporation in the regular course of its business, including its stock ledger, books of account, and minute books, may be kept on, or be in the form of, punch cards, magnetic tape, photographs, microphotographs, electronic format or any other information storage device, provided that the records so kept can be converted into clearly legible form within a reasonable time. The Corporation shall so convert any records so kept upon the request of any person entitled to inspect the same.

Section 8.4. Definitions. For purposes of these Bylaws, “electronic transmission” means any form of communication, not directly involving the physical transmission of paper, that creates a record that may be retained, retrieved and reviewed by a recipient thereof, and that may be directly reproduced in paper form by such a recipient through an automated process.


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Section 8.5. Amendment of Bylaws. These Bylaws may be altered or repealed, and new Bylaws made, by the majority vote of the whole Board of Directors, provided, however, a Bylaw adopted by the holders of stock having a majority of the votes entitled to vote thereon that prescribes the required vote for the election of directors may not be altered by the Board of Directors. The holders of stock having a majority of the votes entitled to vote thereon may make additional Bylaws and may alter and repeal any Bylaws whether adopted by them or otherwise.

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89bio, Inc. 8-K