DEF 14A

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934

(Amendment No. )


Filed by the Registrant ☒	Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☒ Definitive Proxy Statement

☐ Definitive Additional Materials

☐ Soliciting Material under §240.14a-12

Adicet Bio, Inc.

(Name of Registrant as Specified in its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):


☒	No fee required.
☐	Fee paid previously with preliminary materials.
☐	Fee computed on table in exhibit required by Item 25(b) per Securities Exchange Act Rules 14a-6(i)(1) and 0-11

ADICET BIO, INC.

131 Dartmouth Street, 3rd Floor

Boston, Massachusetts 02116

NOTICE OF 2024 ANNUAL MEETING OF STOCKHOLDERS

To be held June 5, 2024

Notice is hereby given that the 2024 Annual Meeting of Stockholders (Annual Meeting) of Adicet Bio, Inc., will be held online on June 5, 2024 at 5:00 p.m. Eastern Time. You may attend the meeting virtually via the Internet at www.virtualshareholdermeeting.com/ACET2024, where you will be able to vote electronically and submit questions. You will need the 16-digit control number included with the Notice of Internet Availability of Proxy Materials being mailed to you separately in order to attend the Annual Meeting.

The purpose of the Annual Meeting is the following:

To elect two class III directors to our board of directors, to serve until the 2027 annual meeting of stockholders and until his or her successor has been duly elected and qualified, or until his or her earlier death, resignation or removal;

To approve an amendment to the Adicet Bio, Inc. Second Amended and Restated 2018 Stock Option and Incentive Plan to increase the number of shares of common stock authorized for issuance under the plan by 5,000,000 shares of common stock;

To approve an amendment to our Third Amended and Restated Certificate of Incorporation to increase the number of authorized shares of common stock from 150,000,000 to 300,000,000;

To approve an amendment to our Third Amended and Restated Certificate of Incorporation to limit the liability of certain of our officers as permitted by Delaware law;

To approve, on a non-binding advisory basis, the compensation of our named executive officers;

To approve, on a non-binding advisory basis, the frequency of future advisory votes on the compensation of our named executive officers;

To ratify the appointment of KPMG LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2024; and

To transact any other business properly brought before the Annual Meeting or any adjournment or postponement of the Annual Meeting.

Only Adicet Bio, Inc. stockholders of record at the close of business on April 9, 2024, will be entitled to vote at the Annual Meeting and any adjournment or postponement thereof.

We are pleased to take advantage of the Securities and Exchange Commission’s “Notice and Access” rules that allow companies to furnish their proxy materials over the Internet. We are mailing to our stockholders a Notice of Internet Availability of Proxy Materials (Notice) instead of a paper copy of our proxy materials and our 2023 Annual Report to Stockholders (2023 Annual Report). We plan to mail the Notice on or about April 23, 2024, which will contain instructions on how to access those documents and to cast your vote via the Internet as well as instructions on how to request a paper copy of our proxy materials and our 2023 Annual Report. This process allows us to provide our stockholders with the

information they need on a timelier basis, while reducing the environmental impact and lowering the costs of printing and distributing our proxy materials.

To be admitted to the Annual Meeting and vote your shares, you must provide the 16-digit control number as provided described in the Notice, or proxy card, or voting instruction form at www.proxyvote.com. Please see the “General Information” section of the proxy statement that accompanies this notice for more details regarding the logistics of the virtual Annual Meeting, including the ability of stockholders to submit questions during the Annual Meeting, and technical details and support related to accessing the virtual platform.

Your vote is important. Whether or not you are able to attend the meeting in person, it is important that your shares be represented. To ensure that your vote is recorded promptly, please vote as soon as possible, even if you plan to attend the meeting, by submitting your proxy via the Internet at the address listed on the proxy card or by signing, dating, and returning the proxy card. If your shares are held in "street name," that is, held for your account by a broker or other nominee, you will receive instructions from the holder of record that you must follow for your shares to be voted.

    By order of the board of directors,

   

    /s/ Chen Schor

   

    Chen Schor

   

    President, Chief Executive Officer

   

Boston, Massachusetts

April 23, 2024

TABLE OF CONTENTS


		Page
PROXY STATEMENT		1
PROPOSAL NO. 1 – ELECTION OF CLASS III DIRECTORS		7
PROPOSAL NO. 2 – APPROVAL OF AN AMENDMENT TO ADICET BIO, INC. SECOND AMENDED AND RESTATED 2018 STOCK OPTION AND INCENTIVE PLAN TO INCREASE THE NUMBER OF SHARES OF COMMON STOCK AUTHORIZED FOR ISSUANCE UNDER THE PLAN BY 5,000,000 SHARES OF COMMON STOCK		13
PROPOSAL NO. 3 – APPROVAL OF AN AMENDMENT TO OUR THIRD AMENDED AND RESTATED CERTIFICATE OF INCORPORATION TO INCREASE AUTHORIZED SHARES OF COMMON STOCK FROM 150,000,000 TO 300,000,000		21
PROPOSAL NO. 4 – APPROVAL OF AN AMENDMENT TO OUR THIRD AMENDED AND RESTATED CERTIFICATE OF INCORPORATION TO LIMIT THE LIABILITY OF CERTAIN OFFICERS OF THE COMPANY AS PERMITTED BY DELAWARE LAW		23
PROPOSAL NO. 5 – NON-BINDING ADVISORY VOTE ON COMPENSATION OF OUR NAMED EXECUTIVE OFFICERS		26
PROPOSAL NO. 6 – NON-BINDING ADVISORY VOTE ON THE FREQUENCY OF FUTURE NON-BINDING ADVISORY VOTES ON THE COMPENSATION OF OUR NAMED EXECUTIVE OFFICERS		27
PROPOSAL NO. 7 – RATIFICATION OF THE APPOINTMENT OF KPMG LLP AS ADICET BIO’S INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM FOR THE FISCAL YEAR ENDING DECEMBER 31, 2024		28
CORPORATE GOVERNANCE		30
EXECUTIVE COMPENSATION		38
PAY VERSUS PERFORMANCE		47
CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS		50
PRINCIPAL STOCKHOLDERS		52
REPORT OF THE AUDIT COMMITTEE		56
HOUSEHOLDING		57
STOCKHOLDER PROPOSALS		57
OTHER MATTERS		57
ANNEX A – AMENDMENT NO. 1 TO ADICET BIO, INC. SECOND AMENDED AND RESTATED 2018 STOCK OPTION AND INCENTIVE PLAN		58
ANNEX B – CERTIFICATE OF AMENDMENT – INCREASE IN AUTHORIZED SHARES		71
ANNEX C – CERTIFICATE OF AMENDMENT – OFFICER EXCULPATION		72

ADICET BIO, INC.

131 Dartmouth Street, 3rd Floor

Boston, Massachusetts 02116

PROXY STATEMENT

FOR THE 2024 ANNUAL MEETING OF STOCKHOLDERS

to be held JUNE 5, 2024

This proxy statement for the 2024 annual meeting of stockholders (Proxy Statement) contains information about the 2024 Annual Meeting of Stockholders (Annual Meeting) of Adicet Bio, Inc., which will be held online on June 5, 2024 at 5:00 p.m. Eastern Time. You may attend the Annual Meeting virtually via the Internet at www.virtualshareholdermeeting.com/ACET2024, where you will be able to vote electronically and submit questions. The board of directors of Adicet Bio, Inc. is using this Proxy Statement to solicit proxies for use at the Annual Meeting. In this Proxy Statement, the terms “Company,” “Adicet Bio,” “Adicet,” “we,” “us,” and “our” refer to Adicet Bio, Inc. The mailing address of our principal executive office is Adicet Bio, Inc., 131 Dartmouth Street, 3rd Floor, Boston, Massachusetts 02116.

All properly submitted proxies will be voted in accordance with the instructions contained in those proxies. If no instructions are specified, the proxies will be voted in accordance with the recommendation of our board of directors with respect to each of the matters set forth in the accompanying Notice of Meeting. You may revoke your proxy at any time before it is exercised at the meeting by giving our corporate secretary written notice to that effect.

This year’s Annual Meeting will be a virtual meeting of the shareholders conducted via live webcast. All shareholders of record on April 9, 2024 are invited to participate in the meeting. We have structured our virtual meeting to provide shareholders the same rights as if the meeting were held in person, including the ability to vote shares electronically during the meeting and ask questions in accordance with the rules of conduct for the meeting. We encourage you to vote your shares prior to the Annual Meeting.

We made this Proxy Statement and our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 available to stockholders on or about April 23, 2024.

Important Notice Regarding the Availability of Proxy Materials for
the Annual Meeting of Stockholders to be Held on June 5, 2024:

This Proxy Statement and our 2023 Annual Report to Stockholders are
available for viewing, printing, and downloading at www.proxyvote.com.

A copy of our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, as filed with the Securities and Exchange Commission (SEC), except for exhibits, will be furnished without charge to any stockholder upon written request to Adicet Bio, Inc., 131 Dartmouth Street, 3rd Floor, Boston, Massachusetts 02116, Attention: Corporate Secretary. This Proxy Statement and our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 are also available on the SEC’s website at www.sec.gov.

ADICET BIO, INC

PROXY STATEMENT

FOR THE 2024 ANNUAL MEETING OF STOCKHOLDERS

GENERAL INFORMATION

When are this Proxy Statement and the accompanying materials scheduled to be sent to stockholders?

We have elected to provide access to our proxy materials to our stockholders via the Internet. Accordingly, on or about April 23, 2024, we will begin mailing a Notice of Internet Availability of Proxy Materials (Notice). Our proxy materials, including the Notice of the 2024 Annual Meeting of Stockholders, this Proxy Statement and the accompanying proxy card or, for shares held in street name (i.e., held for your account by a broker or other nominee), a voting instruction form, and the 2023 Annual Report to Stockholders (2023 Annual Report) will be mailed or made available to stockholders on the Internet on or about the same date.

Why did I receive a Notice of Internet Availability of Proxy Materials instead of a full set of proxy materials?

Pursuant to rules adopted by the SEC, for most stockholders, we are providing access to our proxy materials over the Internet rather than printing and mailing our proxy materials. We believe following this process will expedite the receipt of such materials and will help lower our costs and reduce the environmental impact of our Annual Meeting materials. Therefore, the Notice was mailed to holders of record and beneficial owners of our common stock as of April 9, 2024 starting on or about April 23, 2024. The Notice provides instructions as to how stockholders may access and review our proxy materials, including the Notice of the 2024 Annual Meeting of Stockholders, this Proxy Statement, the proxy card and our 2023 Annual Report, on the website referred to in the Notice or, alternatively, how to request that a paper copy of the proxy materials, including a proxy card, be sent to them by mail. The Notice also provides voting instructions. In addition, stockholders of record may request to receive the proxy materials in printed form by mail or electronically by e-mail on an ongoing basis for future stockholder meetings. Please note that, while our proxy materials are available at the website referenced in the Notice, and our Notice of the 2024 Annual Meeting of Stockholders, this Proxy Statement and our 2023 Annual Report are available on our website, no other information contained on either website is incorporated by reference in or considered to be a part of this Proxy Statement.

How do I attend and participate in the Annual Meeting?

To attend and participate in the Annual Meeting, stockholders will need to access the live audio webcast of the meeting. To do so, stockholders of record as of April 9, 2024 will need to visit www.virtualshareholdermeeting.com/ACET2024 and use their control number found on the proxy card or the Notice, and beneficial owners of shares held in street name will need to follow the same instructions.

You will need the 16-digit control number included on your proxy card or the Notice, as applicable. Instructions on how to connect to the Annual Meeting and participate via the Internet, including how to demonstrate proof of stock ownership, are posted at www.virtualshareholdermeeting.com/ACET2024. If you do not have your 16-digit control number, you will be able to access and listen to the Annual Meeting but you will not be able to vote your shares or submit questions during the Annual Meeting.

The live audio webcast of the Annual Meeting will begin promptly at 5:00 p.m. Eastern Time. We encourage stockholders to login to this website and access the webcast before the Annual Meeting’s start time. Online check-in will begin, and stockholders may begin submitting written questions, at 4:45 p.m. Eastern Time, and you should allow ample time for the check-in procedures.

How can I get help if I have trouble checking in or listening to the meeting online?

We will have technicians ready to assist you with any technical difficulties you may have accessing the virtual meeting or submitting questions. If you encounter any difficulties accessing the virtual meeting during the check-in or meeting time, please call the technical support number that will be posted on the Virtual Shareholder Meeting log in page.

Who is soliciting my vote?

Our board of directors is soliciting your vote for the Annual Meeting.

When is the record date for the Annual Meeting?

The record date for determination of stockholders entitled to vote at the Annual Meeting is the close of business on April 9, 2024.

How many votes can be cast by all stockholders?

There were 82,169,603 shares of our common stock, par value $0.0001 per share, outstanding on April 9, 2024, all of which are entitled to vote with respect to all matters to be acted upon at the Annual Meeting. Each stockholder of record is entitled to one vote for each share of our common stock held by such stockholder. There are no cumulative voting rights. None of our shares of undesignated preferred stock were outstanding as of April 9, 2024.

Who is entitled to vote?

Holders of record of our common stock at the close of business on April 9, 2024, the record date for the Annual Meeting, are entitled to receive notice of the Annual Meeting and to vote at the Annual Meeting. If you are a holder of record of our common stock as of the record date, you may vote the shares that you held on the record date even if you sell such shares after the record date. Each outstanding share as of the record date entitles its holder to cast one vote for each matter to be voted upon and, with respect to the election of directors, one vote for each director to be elected.

Registered Stockholders. If shares of our common stock are registered directly in your name with our transfer agent, you are considered the stockholder of record with respect to those shares. As the stockholder of record, you have the right to grant your voting proxy directly to the individuals listed on the proxy card or vote on your own behalf at our virtual Annual Meeting. Throughout this Proxy Statement, we refer to these registered stockholders as "stockholders of record."

Street Name Stockholders. If shares of our common stock are held on your behalf in a brokerage account or by a bank or other nominee, you are considered to be the beneficial owner of shares that are held in "street name," and the proxy materials were forwarded to you by your broker or nominee, who is considered the stockholder of record with respect to those shares. As the beneficial owner, you have the right to direct your broker, bank or other nominee as to how to vote your shares. Beneficial owners are also invited to attend our virtual Annual Meeting. However, since a beneficial owner is not the stockholder of record, you may not vote your shares of our common stock on your own behalf at the Annual Meeting unless you follow your broker's procedures for obtaining a legal proxy. Note you should also be receiving a voting instruction form for you to use from your broker. Throughout this Proxy Statement, we refer to stockholders who hold their shares through a broker, bank or other nominee as "street name stockholders."

How do I vote?

If you are a stockholder of record, there are several ways for you to vote your shares.

•

By Internet. You may vote at www.proxyvote.com, 24 hours a day, seven days a week, by following the instructions at that site for submitting your proxy electronically. You will be required to enter the 16-digit control number provided on your proxy card or voting instruction form. Votes submitted through the Internet prior to the commencement of the Annual Meeting.

•

By Telephone. You may vote using a touch-tone telephone by calling 1-800-690-6903, 24 hours a day, seven days a week. You will be required to enter the 16-digit control number provided on your proxy card or voting instruction form. Votes submitted by telephone prior to the commencement of the Annual Meeting.

•

By Mail. If you requested and received a printed copy of the proxy materials, you may vote by mail by completing, signing, and dating the enclosed proxy card and returning it in the enclosed prepaid envelope. Votes submitted through the mail must be received prior to June 4, 2024.

•

During the Annual Meeting. If you attend the Annual Meeting online, you may vote your shares online while virtually attending the Annual Meeting by visiting www.virtualshareholdermeeting.com/ACET2024. You will need your control number provided on your proxy card or the Notice in order to be able to vote during the Annual Meeting.

If you do not wish to vote in person or will not be attending the Annual Meeting, you may vote by proxy. You can vote by proxy over the Internet by following the instructions provided in the Notice, or, if you requested printed copies of the proxy materials by mail, you can vote by mailing your proxy as described in the proxy materials. In order to be counted, proxies submitted by Internet must be received by the cutoff time of 11:59 p.m. Eastern Time on June 4, 2024. Proxies submitted by mail must be received before the start of the Annual Meeting. If you complete and submit your proxy before the Annual Meeting, the persons named as proxies will vote the shares represented by your proxy in accordance with your instructions. If you submit a proxy without giving voting instructions, your shares will be voted in the manner recommended by our board of directors on all matters presented in this Proxy Statement, and as the persons named as proxies may determine in their discretion with respect to any other matters properly presented at the Annual Meeting. You may also authorize another person or persons to act for you as proxy in a writing, signed by you or your authorized representative, specifying the details of those proxies’ authority. The original writing must be given to each of the named proxies, although it may be sent to them by electronic transmission if, from that transmission, it can be determined that the transmission was authorized by you.

Even if you plan to participate in our virtual Annual Meeting, we recommend that you also vote by proxy so that your vote will be counted if you later decide not to participate in the Annual Meeting. If you submit a proxy via the Internet, by telephone, or by mail, your voting instructions authorize the proxy holders in the same manner as if you signed, dated, and returned your proxy card. If you submit a proxy via the Internet, by telephone, or by mail, you do not need to return your proxy card.

If any other matters are properly presented for consideration at the Annual Meeting, including, among other things, consideration of a motion to adjourn the Annual Meeting to another time or place (including, without limitation, for the purpose of soliciting additional proxies), the persons named in your proxy and acting thereunder will have discretion to vote on those matters in accordance with their best judgment. We do not currently anticipate that any other matters will be raised at the Annual Meeting.

How do I revoke my proxy?

You may revoke your proxy by (1) following the instructions on the Notice and entering a new vote by mail that we receive before the start of the Annual Meeting or over the Internet by the cutoff time of 11:59 p.m. Eastern Time on June 4, 2024, (2) attending and voting at the Annual Meeting (although attendance at the Annual Meeting will not in and of itself revoke a proxy), or (3) by filing an instrument in writing revoking the proxy or another duly executed proxy bearing a later date with our Corporate Secretary. Any written notice of revocation or subsequent proxy card must be received by our Corporate Secretary prior to the taking of the vote at the Annual Meeting. Such written notice of revocation or subsequent proxy card should be hand delivered to our Corporate Secretary or sent to our principal executive offices at Adicet Bio, Inc., 131 Dartmouth Street, 3rd Floor, Boston, Massachusetts 02116, Attention: Corporate Secretary.

If a broker, bank, or other nominee holds your shares, you must contact such broker, bank, or nominee in order to find out how to change your vote.

How is a quorum reached?

Our Amended and Restated Bylaws, or bylaws, provide that a majority of the shares entitled to vote, present in person or represented by proxy, will constitute a quorum for the transaction of business at the Annual Meeting.

Under the General Corporation Law of the State of Delaware, shares that are voted “abstain” or “withheld” and broker “non-votes” are counted as present for purposes of determining whether a quorum is present at the Annual Meeting. If a quorum is not present, the meeting may be adjourned until a quorum is obtained. There were 82,169,503 shares of common stock outstanding and entitled to vote on April 9, 2024, our record date. Therefore, a quorum will be present if 41,084,752 shares of our common stock are present in person or represented by executed proxies timely received by us at the Annual

Meeting. Shares present virtually during the Annual Meeting will be considered shares of common stock represented in person at the meeting.

How is the vote counted?

Under our bylaws, directors are elected by a plurality of the votes properly cast. This means that the three director nominees receiving the highest number of affirmative votes will be elected as directors. You may vote for all the director nominees, withhold authority to vote your shares for all the director nominees or withhold authority to vote your shares with respect to any one or more of the director nominees. Withholding authority to vote your shares with respect to one or more director nominees will have no effect on the election of those nominees. Abstentions and broker “non-votes” (as defined below) will have no effect on the election of the nominees.

Under our bylaws, any proposal other than an election of directors is decided by a majority of the votes properly cast for and against such proposal, except where a larger vote is required by law or by our Third Amended and Restated Certificate of Incorporation, or certificate of incorporation, or bylaws. Abstentions and broker “non-votes” do not have an impact on such proposals.

If you authorize your proxy to vote your shares electronically via the Internet or by telephone, or, if you properly marked, signed, dated and returned the proxy card mailed to you, the shares that the proxy represents will be voted in the manner specified on the proxy. If you properly signed and returned a proxy card but no specification is made, your shares will be voted (i) “for all” on the election of the director nominees named in this Proxy Statement, (ii) “for” the approval of the amendment to our second amended and restated 2018 stock option and incentive plan to increase the number of shares of common stock issuable under the plan, as described in this Proxy Statement, (iii) “for” the amendment to our certificate of incorporation that increases the number of authorized shares of common stock from 150,000,000 to 300,000,000, (iv) “for” the amendment to our certificate of incorporation that limits liability for certain officers to the maximum extent permitted by Delaware law, (v) “for” the ratification of a non-binding advisory vote on compensation of our named executive officers, (vi) for the ratification of a non-binding advisory vote of “one year” as the frequency of future advisory votes on the compensation of our named executive officers, and (vii) “for” ratification of the appointment of KPMG LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2024.

If your shares are held in “street name” by a brokerage firm, your brokerage firm is required to vote your shares according to your instructions. Pursuant to the New York Stock Exchange (NYSE) rules, also applicable to Nasdaq companies, if you do not give instructions to your brokerage firm, the brokerage firm will still be able to vote your shares with respect to “discretionary” items, but will not be allowed to vote your shares with respect to “non-discretionary” items. The amendment to our certificate of incorporation to increase the number of authorized shares (Proposal No. 3) and the ratification of the appointment of KPMG LLP as our independent registered public accounting firm (Proposal No. 7) are considered to be a discretionary item under the NYSE rules and your broker or nominee will be able to vote on that item even if it does not receive instructions from you. The election of directors (Proposal No. 1), the approval of the amendment to our Second Amended and Restated 2018 Stock Option and Incentive Plan (Proposal No. 2), the amendment to our certificate of incorporation to limit liability for certain of our officers (Proposal No. 4), the ratification of, on a non-binding advisory basis, the compensation of our named executive officers (Proposal No. 5) and the ratification of, on a non-binding advisory basis, the frequency of future advisory votes on the compensation of our named executive officers (Proposal No. 6) are considered non-discretionary items. A broker or nominee may not vote your shares with respect to these non-discretionary items if you have not provided instructions. This is called a “broker non-vote.” We strongly encourage you to submit your proxy with instructions and exercise your right to vote as a stockholder.

Who pays the cost for soliciting proxies?

We are making this solicitation and will pay the entire cost of preparing and distributing the Notice and our proxy materials and soliciting votes. If you choose to access the proxy materials or vote over the Internet, you are responsible for any Internet access charges that you may incur. Our officers and employees may, without compensation other than their regular compensation, solicit proxies through further mailings, personal conversations, facsimile transmissions, e-mails, or otherwise. We have hired Broadridge Financial Solutions, Inc. to assist us in the distribution of proxy materials described above. Proxy solicitation expenses that we will pay include those for preparation, mailing, returning, and tabulating the proxies.

How may stockholders submit matters for consideration at an annual meeting?

Under our bylaws, certain procedures are provided that a stockholder must follow to nominate persons for election as directors or to introduce an item of business at an annual meeting of stockholders. These procedures provide that nominations for director nominees and/or an item of business to be introduced at an annual meeting of stockholders must be timely submitted in writing to the Secretary of the Company, at 131 Dartmouth Street, 3rd Floor Boston, Massachusetts 02116 or by email at IR@adicetbio.com. To be considered timely, the required notice must be in writing and received by our corporate secretary at our principal executive offices not less than 90 days nor more than 120 days prior to the first anniversary of the preceding year’s annual meeting. However, in the event that the date of the annual meeting is advanced by more than 30 days, or delayed by more than 60 days, from the first anniversary of the preceding year’s annual meeting, or if no annual meeting were held in the preceding year, a stockholder’s notice must be so received no earlier than the 120th day prior to such annual meeting and not later than the close of business on the later of (A) the 90th day prior to such annual meeting and (B) the tenth day following the day on which notice of the date of such annual meeting was mailed or public disclosure of the date of such annual meeting was made, whichever first occurs.

In addition, any stockholder who, in accordance with Rule 14a-8 of the Securities Exchange Act of 1934, as amended (Exchange Act), wishes to present a proposal intended to be included in the proxy statement for the next annual meeting of our stockholders in 2025 must submit such proposals to us not later than December 19, 2024. These proposals must comply with all rules and regulations of the SEC, including Rule 14a-8 under the Exchange Act. Additionally, stockholders who intend to solicit proxies in support of director nominees other than the Company’s nominees must provide notice that sets forth the information required by Rule 14a-19 under the Exchange Act by the same deadline noted herein to submit a notice of nomination for consideration at next year’s annual meeting. If the date of the annual meeting is moved by more than 30 days from the date contemplated at the time of the previous year’s proxy statement, then notice must be received within a reasonable time before we begin to print and send proxy materials. If that happens, we will publicly announce the deadline for submitting a proposal in a press release or in a document filed with the SEC.

How can I know the voting results?

We plan to announce preliminary voting results at the Annual Meeting and will publish final results in a Current Report on Form 8-K to be filed with the SEC within four business days following the Annual Meeting.

PROPOSAL NO. 1 – ELECTION OF CLASS III DIRECTORS

Our board of directors currently consists of eight members. In accordance with the terms of our certificate of incorporation and bylaws, our board of directors is divided into three classes, class I, class II and class III, with members of each class serving staggered three-year terms. The members of the classes are divided as follows:

•

the class I directors are Aya Jakobovits, Ph.D., Katie Peng and Chen Schor, and their terms will expire at the annual meeting of stockholders to be held in 2025;

•

the class II directors are Jeffrey Chodakewitz, M.D., Steve Dubin and Carl L. Gordon, Ph.D. and their terms will expire at the annual meeting of the stockholders to be held in 2026; and

•

the class III directors are Michael G. Kauffman, M.D., Ph.D. and Andrew Sinclair, Ph.D., and their terms will expire at the Annual Meeting.

Upon the expiration of the term of a class of directors, directors in that class will be eligible to be elected for a new three-year term at the annual meeting of stockholders in the year in which their term expires.

Our certificate of incorporation and bylaws provide that the authorized number of directors may be changed only by resolution of our board of directors. Our certificate of incorporation also provides that our directors may be removed only for cause by the affirmative vote of the holders of at least two-thirds (2/3) of the outstanding shares then entitled to vote in an annual election of directors, and that any vacancy on our board of directors, including a vacancy resulting from an enlargement of our board of directors, may be filled only by vote of a majority of our directors then in office, even if less than a quorum of the board of directors.

Our board of directors has nominated Michael G. Kauffman, M.D., Ph.D. and Andrew Sinclair, Ph.D. for election as the class III directors at the Annual Meeting. The nominees are presently directors, and have indicated a willingness to continue to serve as directors, if elected. If the nominees become unable or unwilling to serve, however, the properly submitted proxies may be voted for a substitute nominee selected by our board of directors.

In addition to the information presented below regarding each of the nominees and continuing directors’ specific experience, qualifications, attributes and skills that our board of directors and our Nominating and Corporate Governance Committee of our board of directors (Nominating and Corporate Governance Committee) considered in determining that he or she should serve as a director, we also believe that each of our directors has demonstrated business acumen, integrity and an ability to exercise sound judgment, as well as a commitment of service to Adicet and our board of directors.

Nominees for Election as Class III Directors

The following table identifies our director nominees, and sets forth their principal occupation and business experience during the last five years and their ages as of April 9, 2024.


Name	Position and Offices Held with Adicet Bio	Director Since	Age
Michael G. Kauffman, M.D., Ph.D.	Director	2021	60
Andrew Sinclair, Ph.D.	Director	2021	52

Michael G. Kauffman, M.D., Ph.D. has served as a member of our board of directors since November 2021. Since November, 2023, Dr. Kauffman has served as the Chief Executive Officer, President and member of the board of directors of Nereid Therapeutics Inc., a private biotechnology company. Dr. Kauffman co-founded Karyopharm Therapeutics Inc. (Karyopharm) (Nasdaq: KPTI) in 2008 and served as the Chief Executive Officer from January 2011 to April 2021, as Chief Medical Officer from December 2012 to July 2019, and as a director from 2008 to March 2022. Prior to joining Karyopharm, Dr. Kauffman served as Chief Medical Officer at Onyx Pharmaceuticals Inc. (Onyx) (acquired by Amgen Inc.) from November 2009 until December 2010, which acquired Proteolix Inc. in November 2009 where he was Chief Medical Officer after being a member of the board of directors from April 2009 until its acquisition by Onyx. Prior to joining Onyx, Dr. Kauffman was an operating partner at Bessemer Venture Partners where he led investments in biotechnology companies.

Prior to that, he served as President and Chief Executive Officer at Epix Pharmaceuticals, Inc. and President and Chief Executive Officer of Predix Pharmaceuticals, Inc. From May 2017 to June 2020, Dr. Kauffman served on the board of Infinity Pharmaceuticals, Inc. (Nasdaq: INFI). In addition to Adicet, Dr. Kauffman has served on the board of directors of Kezar Life Sciences, Inc. (Nasdaq: KZR) since June 2017, Verastem Inc. (Nasdaq: VSTM) since November 2012, and BiVictriX Therapeutics, Plc since January 2022, along with private companies Incendia Therapeutics, Inc. (formerly Parthenon Therapeutics, Inc.) since October 2022 and Mirror Biologics, Inc. since September 2022. We believe Dr. Kauffman is qualified to serve on our board of directors due to his experience and leadership roles in the pharmaceutical industry.

Andrew Sinclair, Ph.D. has served as a member of our board of directors since March 2021. Dr. Sinclair is currently a partner at Abingworth LLP (Abingworth), a life sciences investment group. He has been at Abingworth since November 2008 where he has served in various positions focusing on investments in public and private biotech and pharmaceutical companies. Prior to joining Abingworth, he was senior equity analyst, director at HSBC Global Markets, where he was responsible for investment research in the mid-cap pharmaceutical sector. Previously, Dr. Sinclair held biotechnology analyst positions at Credit Suisse and SG Cowen. Dr. Sinclair has served on the board of directors of Soleno Therapeutics, Inc. (Nasdaq: SLNO) since December 2018 and previously served on the boards of directors of Sierra Oncology, Inc. (acquired by GSK plc) from November 2019 to July 2022, and Verona Pharma plc (Nasdaq: VRNA) from July 2016 to April 2022. Dr. Sinclair received his B.Sc. in Microbiology from King's College London and his Ph.D. in Chemistry and Genetic Engineering at the BBSRC Institute of Plant Science, Norwich, United Kingdom. Dr. Sinclair qualified as a chartered accountant, formerly with KPMG LLP. We believe Dr. Sinclair is qualified to serve on our board of directors due to his extensive background in strategic development within the biotechnology and pharmaceutical industries.

Vote Required and Board of Directors’ Recommendation

To be elected, the director nominees must receive a plurality of the votes properly cast on the election of directors, meaning that the director nominee receiving the most votes will be elected. You may vote either FOR all the nominees, FOR any one of the nominees, WITHHOLD your vote from all the nominees or WITHHOLD your vote from any one or more of the nominees. Votes that are withheld and broker “non-votes” will have no effect on the election of directors.

The proxies will be voted in favor of the above nominees unless a contrary specification is made in the proxy. The nominees have consented to serve as our directors if elected. However, if the nominees are unable to serve or for good cause will not serve as a director, the proxies will be voted for the election of such substitute nominee as our board of directors may designate.

THE BOARD OF DIRECTORS RECOMMENDS VOTING “FOR” THE ELECTION OF Michael G. Kauffman, M.D., Ph.D. and Andrew Sinclair, PH.D. AS THE CLASS III DIRECTORS, TO SERVE FOR A THREE-YEAR TERM ENDING AT THE ANNUAL MEETING OF STOCKHOLDERS TO BE HELD IN 2027.

Directors Continuing in Office

The following table identifies our continuing directors, and sets forth their principal occupation and business experience during the last five years and their ages as of April 9, 2024.


Name	Position and Offices Held with Adicet Bio	Position Held Since(1)	Class and Year in Which Term Expires	Age
Aya Jakobovits, Ph.D.	Director	2014	Class I – 2025	71
Chen Schor	President, Chief Executive Officer and Director	2020	Class I – 2025	51
Katie Peng	Director	2023	Class I—2025	53
Carl L. Gordon, Ph.D.	Director	2015	Class II – 2026	58
Jeffrey Chodakewitz, M.D.	Director	2020	Class II – 2026	67
Steve Dubin	Director	2020	Class II – 2026	70

(1)

The years set forth below reflect when the director joined our board of directors.

Class I Directors (Term Expires at 2025 Annual Meeting)

Aya Jakobovits, Ph.D. has served as a member of our board of directors since the completion of the merger of resTORbio, Inc. (resTORbio) and Adicet Bio, Inc. (when referred to prior to the Merger, Former Adicet) in September 2020 (the Merger) and previously served as a member of the board of directors of Former Adicet since November 2014. Dr. Jakobovits founded Former Adicet and served as President and Chief Executive Officer from its incorporation until February 2018. From February 2018 until February 2019, Dr. Jakobovits served as a senior strategic advisor to Former Adicet. Prior to starting Former Adicet, Dr. Jakobovits served as a Venture Partner with OrbiMed Advisors LLC from 2011 to 2016. From September 2010 to December 2013, she served as President and Founding Chief Executive Officer of Kite Pharma Inc. From December 2007 to June 2010, she served as Executive Vice President, Head of Research and Development at Agensys Inc. (Agensys), an affiliate of Astellas Pharma, Inc. (Astellas). Before Agensys’ acquisition by Astellas, she served as Agensys’ Senior Vice President, Technology and Corporate Development and Chief Scientific Officer and led its research, development, clinical and corporate development operations from January 1999 to December 2007. Before Agensys, from 1996 to 1999, Dr. Jakobovits served as Director, Discovery Research and Principal Scientist at Abgenix Inc. (acquired by Amgen Inc.) which was spun out of Cell Genesys, Inc. (Cell Genesys) in 1996 based on the XenoMouse® technology developed under her leadership. She joined Cell Genesys in 1989 and served ultimately as Director, Molecular Immunology. Dr. Jakobovits currently serves on the boards of directors of Dorian Therapeutics Inc. She served on the board of UCLA Technology Development Corporation from 2017 to 2022 and on the board of Yeda Research and Development Co. Ltd. From 2019 to 2023. Dr. Jakobovits previously served on the boards of directors of cCAM Biotherapeutics Ltd. (acquired by Merck & Co. Inc.) from 2013 to 2015 and the Alliance for Cancer Gene Therapy from 2015 to 2019. Dr. Jakobovits received her B.Sc. from the Hebrew University of Jerusalem, her M.Sc. in Chemistry and Ph.D. in Life Sciences from the Weizmann Institute of Sciences, Israel, and was a postdoctoral fellow at University of California, San Francisco and at Genentech, Inc. (Genentech). We believe Dr. Jakobovits is qualified to serve on our board of directors because of her expertise, experience, and track record in forming and growing successful companies and in developing immunotherapy platform technologies and oncology products.

Chen Schor has served as our President and Chief Executive Officer and as a member of our board of directors since the completion of the Merger. Previously, he held the role of director, President and Chief Executive Officer at resTORbio since co-founding the company in 2016. Mr. Schor previously served as President, Chief Executive Officer and director of Synta Pharmaceuticals Corp. from May 2015 until its merger with Madrigal Pharmaceuticals, Inc. in July 2017, and prior to that, from 2014 until 2016, Mr. Schor served as the company’s Executive Vice President and Chief Operation Officer. From September 2012 to December 2014, Mr. Schor served as President and Chief Executive Officer of Novalere FP, Inc. From September 2011 to October 2012, Mr. Schor served as Chief Business Officer of Eleven Biotherapeutics, Inc. From March 2009 until September 2011, Mr. Schor served as Vice President of Business Development, global branded products at Teva Pharmaceutical Industries Limited (NYSE: TEVA). Mr. Schor currently serves on the board of the Alliance for Cancer Gene Therapy, a non-for-profit organization committed to advancing new cancer cell and gene therapies. He is also chair of the board of directors of Carbon Biosciences, Inc., a member of the board of directors of Karyopharm since December 2020, and previously served on the board of Brainstorm Cell Therapeutics Inc. (Nasdaq: BCLI) from September 2011 to April 2020. Mr. Schor received his M.B.A. from Tel Aviv University, a B.A. in Economics and Accounting from Haifa University and a B.A. in Biology from Tel Aviv University. We believe that Mr. Schor is qualified to serve on our board of directors due to his service as our President and Chief Executive Officer and his extensive knowledge of our company and industry.

Katie Peng has served as a member of our board of directors since July 2023. Since September 2021, Ms. Peng has served as Chief Commercial Officer at Denali Therapeutics Inc. (Nasdaq: DNLI). From April 2017 to September 2021, Ms. Peng served as the Senior Vice President, Head of the Ophthalmology, Metabolism, Neurosciences, Immunology Business Unit at Genentech, where she was responsible for the oncology, neurology, and rare diseases portfolio, and served as part of Genentech’s commercial leadership team. From February 2012 to April 2017, Ms. Peng held a number of senior leadership positions at Roche Holding AG (Roche), managing the Roche portfolio in the Asia Pacific region as the General Manager of two countries. Ms. Peng has also served as a member of the board of directors of Scholar Rock Holding Corporation (Nasdaq: SRRK) since February 2024, and serves as a board member for the nonprofit organization California Life Sciences. She holds a B.A. from the University of California, Berkeley and an M.B.A. from the Kelley School of Business, Indiana University. We believe Ms. Peng is qualified to serve on our board of directors because of her expertise and experience working for various pharmaceutical and biotechnology companies.

Class II Directors (Term Expires at 2026 Annual Meeting)

Carl L. Gordon, Ph.D, CFA has served as a member of our board of directors since the completion of the Merger and previously served as a member of the board of directors of Former Adicet since August 2015. Dr. Gordon is a founding member, Managing Partner, and Co-Head of Global Private Equity at OrbiMed Advisors LLC, an investment firm. Dr. Gordon has served on the boards of directors of ArriVent Biopharma, Inc. (Nasdaq: AVBP) since December 2022, Compass Therapeutics, Inc. (Nasdaq: CMPX) since September 2015, Keros Therapeutics, Inc. (Nasdaq: KROS) since March 2020, Kinnate Biopharma, Inc. (Nasdaq: KNTE) since December 2019, and Terns Pharmaceuticals, Inc. (Nasdaq: TERN) since October 2018, as well as several private companies. Dr. Gordon previously served on the boards of directors of Alector Inc. (Nasdaq: ALEC) from October 2013 to June 2019, Arsanis, Inc. (which merged with X4 Pharmaceuticals, Inc.) from January 2013 to March 2019, Gemini Therapeutics, Inc. (which merged with Disc Medicine, Inc.) from April 2016 to December 2022, ORIC Pharmaceuticals, Inc. (Nasdaq: ORIC) from November 2015 to November 2021, Passage Bio Inc. (Nasdaq: PASG) from September 2018 to February 2020, Prevail Therapeutics Inc. (acquired by Eli Lilly and Company) from October 2017 to January 2021, SpringWorks Therapeutics Inc. (Nasdaq: SWTX) from August 2017 to September 2019, Theseus Pharmaceuticals, Inc. (Nasdaq: THRX) from June 2018 to February 2024 and Turning Point Therapeutics, Inc. (acquired by Bristol-Myers Squibb Company) from May 2017 to November 2020. Dr. Gordon received a B.A. in Chemistry from Harvard College, a Ph.D. in Molecular Biology from the Massachusetts Institute of Technology, and was a Fellow at The Rockefeller University. We believe Dr. Gordon is qualified to serve as the Chairperson of our board of directors because of his venture capital experience, expertise in the scientific field of molecular biology and financial credentials.

Jeffrey Chodakewitz, M.D. has served as a member of our board of directors since the completion of the Merger and previously served as a member of the board of directors of resTORbio since August 2018. Since October 2022, Dr. Chodakewitz has served as Entrepreneur-in-Residence at Yale University Ventures and since December 2022, he has served as Advisory Partner of Ascenta Capital Management LLC. From March 2019 to January 2022, Dr. Chodakewitz served as a senior/executive advisor at Blackstone Life Sciences. From April 2018 through March 2019, Dr. Chodakewitz served as Executive Vice President, Clinical Medicine and External Innovation, at Vertex Pharmaceuticals Incorporated (Vertex) (Nasdaq: VRTX). Prior to that role, Dr. Chodakewitz held the roles of Chief Medical Officer and Executive Vice President, Global Medicines Development and Medical Affairs at Vertex from January 2014 to April 2018 and was a member of the Vertex Executive Committee. From December 1990 to December 2013, he worked at Merck & Co., Inc. (NYSE: MRK), where he served in a number of positions including Head of Infectious Diseases and Vaccines Global Development from August 2013 to December 2013, Senior Vice President of Global Scientific Strategy (Infectious Disease, Respiratory & Immunology) from January 2013 to August 2013 and Senior Vice President of Late Stage Development from March 2011 to January 2013. Dr. Chodakewitz is a Diplomate of the National Board of Medical Examiners and the American Board of Internal Medicine (both Internal Medicine and Infectious Disease). Dr. Chodakewitz has served as a member of the board of directors of Praxis Precision Medicines, Inc. (Nasdaq: PRAX) since April 2021, Schrodinger, Inc. (Nasdaq: SDGR) since April 2020 and Freeline Therapeutics Holdings plc. (Nasdaq: FRLN) since September 2019, and previously served on the board of public company Tetraphase Pharmaceuticals Inc. from June 2014 to July 2020, which was acquired by La Jolla Pharmaceutical Company in July 2020. He holds a B.S in Biochemistry cum laude from Yale University and an M.D. from the Yale University School of Medicine. We believe Dr. Chodakewitz is qualified to serve on our board of directors because of his extensive experience working for various pharmaceutical and biotechnology companies.

Steve Dubin, J.D. has served as a member of our board of directors since the completion of the Merger. Since November 2011, Mr. Dubin has been a Principal in SDA Ventures LLC, a firm focused on assisting emerging growth and middle-market companies, primarily in the health & wellness and nutritional products markets, on matters including corporate development, business acquisition, customer relations, growth strategies and corporate finance. From 2006 until its acquisition by Koninklijke DSM N.V. (DSM) in February 2011, Mr. Dubin served as Chief Executive Officer and a member of the board of directors of Martek Biosciences Corporation (Martek). He later served as President of DSM’s Nutritional Lipids Division from February 2011 through October 2011 and as a Senior Advisor to DSM Nutritional Products from November 2011 through October 2012. After joining Martek in 1992 and serving in various management positions, including Chief Financial Officer, Treasurer, Secretary, General Counsel and Senior Vice President, Business Development, he served as President of Martek from 2003 to 2006. Mr. Dubin currently serves as a member of the board of directors of privately held companies Triton Algae Innovations, Ltd. and Phytolon LTD. From May 2013 to March 2024, Mr. Dubin served on the board of directors of Alcresta Therapeutics, Inc. From January 2014 to January 2018, Mr. Dubin served on the board of directors of Enzymotec Ltd. Mr. Dubin is a certified public accountant and a member of the Maryland Bar. He holds a bachelor’s degree in accounting from the University of Maryland and a J.D. from the National Law Center at George Washington University. We believe Mr. Dubin is qualified to serve on our board of directors because of his accounting experience and extensive experience working with emerging growth and middle-market companies.

There are no family relationships between or among any of our directors or executive officers. The principal occupation and employment during the past five years of each of our directors was carried on, in each case except as specifically identified in this Proxy Statement, with a corporation or organization that is not a parent, subsidiary or other affiliate of us. There is no arrangement or understanding between any of our directors and any other person or persons pursuant to which he or she is to be selected as a director.

There are no material legal proceedings to which any of our directors is a party adverse to us or any of our subsidiaries or in which any such person has a material interest adverse to us or our subsidiary.

Board Diversity Matrix

The composition of our board of directors currently includes two individuals who are diverse under the Nasdaq listing rule regarding board diversity, representing gender diversity of 25%, as presented in the below Board Diversity Matrix. Under the Nasdaq listing rule, directors who self-identify as (i) female, (ii) an underrepresented minority or (iii) LGBTQ+ are defined as being diverse.


Board Diversity Matrix (As of April 9, 2024)
Total Number of Directors		8
	Female	Male	Non-Binary	Did Not Disclose Gender
Part I: Gender Identity
Directors	2	6	—	—
Part II: Demographic Background
African American or Black	—	—	—	—
Alaskan Native or Native American	—	—	—	—
Asian	1	—	—	—
Hispanic or Latinx	—	—	—	—
Native Hawaiian or Pacific Islander	—	—	—	—
White	1	6	—	—
Two or More Races or Ethnicities	—	—	—	—
LGBTQ+	—
Did Not Disclose Demographic Background	—

Executive Officers Who Are Not Directors

The following table identifies our executive officers who are not directors, and sets forth their current positions at Adicet Bio and their ages as of April 9, 2024.


Name	Position Held with Adicet	Officer Since(1)	Age
Blake Aftab, Ph.D.	Chief Scientific Officer	2021	42
Francesco Galimi, M.D., Ph.D.	Chief Medical Officer	2019	56
Nick Harvey	Chief Financial Officer	2020	63
Donald Healey, Ph.D.	Chief Technology Officer	2020	62

(1) The years set forth below reflect when the individual became an executive officer of our company.

You should refer to “Class I Directors” above for information about our Chief Executive Officer and President, Chen Schor. Biographical information for our other executive officers, as of April 9, 2024, is set forth below.

Blake Aftab, Ph.D. has served as our Chief Scientific Officer since October 2021 and previously served as Vice President of Research and Development since April 2021. Prior to Adicet, Dr. Aftab worked at Atara Biotherapeutics, Inc. (Atara) (NasdaqGS: ATRA), where he served as Vice President and Head of Preclinical and Translational Sciences and other various leadership roles from April 2015 to March 2021. During his tenure at Atara, Dr. Aftab was responsible for research strategy and execution of Atara’s preclinical science and translational medicine activities. Prior to that, Dr. Aftab held various

roles of increasing responsibility at the University of California, San Francisco School of Medicine from October 2012 to August 2015. Dr. Aftab received his Ph.D. from the John Hopkins University School of Medicine and holds a B.S. in Pharmacology from the University of California.

Francesco Galimi, M.D., Ph.D. has served as our Chief Medical Officer since the completion of the Merger and previously served as Chief Medical Officer of Former Adicet since September 2019. Prior to Adicet, Dr. Galimi worked at Amgen Inc. (Amgen) (NasdaqGS: AMGN), where he served as Global Program General Manager, Early Development from August 2015 to September 2019. During his tenure at Amgen, he was responsible for the cross-functional strategy and execution of a portfolio of oncology programs, from pre-IND to late-stage. From November 2014 to August 2015, Dr. Galimi was the Head of Clinical Development at Onyx Pharmaceuticals Inc. (acquired by Amgen), where he led the Oncology Clinical Development Group. From 2011 to 2014 he served in leadership roles at the Genomics Institute of the Novartis Research Foundation, leading the early development of a portfolio of oncology programs. Dr. Galimi holds a M.D. from the University of Torino Medical School with a specialty certification in Medical Oncology, and a Ph.D. in Human Oncology from the University of Torino Medical School.

Donald Healey, Ph.D. has served as our Chief Technology Officer since October 2020. From February 2017 to October 2020, Dr. Healey served as the Senior Vice President, Operations and Site Head for KBI Biopharma, Inc., a biopharmaceutical contract services organization. From April 2010 to February 2017, Dr. Healey held multiple roles at Acer Therapeutics Inc. (formerly Opexa Therapeutics, Inc. and acquired by Zevra Therapeutics (NasdaqGS: ZVRA)) (Acer), where he was responsible for all pre-clinical scientific development, closed-system process design and the scaling of Acer’s autologous T-cell immunotherapy. From March 2001 to April 2010, Dr. Healey held various positions at Argos Therapeutics, Inc. and ML Laboratories, UK, (formerly Cobra Therapeutics Ltd.). Dr. Healey received his Ph.D. from University of London, and holds a B.Sc. in Cellular Pathology from Bristol University.

Nick Harvey has served as our Chief Financial Officer since the completion of the Merger. Previously, he served as the Chief Financial Officer since July 2018 and the Executive Vice President and Treasurer since October 2018 of Centrexion Therapeutics Corporation until December 2019, then as Senior Advisor through January 2020. From June 2017 through June 2018, he served as an independent consultant to private and public life science companies. Prior to that, Mr. Harvey served as the Chief Financial Officer of Radius Health Inc. (acquired by Gurnet Point Capital and Patient Square Capital) from December 2006 to May 2017. Mr. Harvey received a Bachelor of Economics degree and a Bachelor of Laws degree with first-class honors from the Australian National University and an M.B.A. from the Harvard Business School.

The principal occupation and employment during the past five years of each of our executive officers was carried on, in each case except as specifically identified in this Proxy Statement, with a corporation or organization that is not a parent, subsidiary or other affiliate of us. There is no arrangement or understanding between any of our executive officers and any other person or persons pursuant to which he was or is to be selected as an executive officer.

There are no material legal proceedings to which any of our executive officers is a party adverse to us or our subsidiary or in which any such person has a material interest adverse to us or our subsidiary.

PROPOSAL NO. 2 – TO APPROVE AN AMENDMENT TO THE ADICET BIO, INC. SECOND AMENDED AND RESTATED 2018 STOCK OPTION AND INCENTIVE PLAN TO INCREASE THE NUMBER OF SHARES OF COMMON STOCK AUTHORIZED FOR ISSUANCE UNDER THE PLAN BY 5,000,000 SHARES OF COMMON STOCK

Our board of directors believes that stock-based incentive awards can play an important role in the success of the Company by encouraging and enabling the employees, officers, non-employee directors and consultants of the Company and its subsidiaries upon whose judgment, initiative and efforts we largely depend for the successful conduct of its business, to acquire a proprietary interest in the Company. Our board of directors believes that providing such persons with a direct stake in the Company assures a closer identification of the interests of such individuals with those of the Company and our stockholders, thereby stimulating their efforts on our behalf and strengthening their desire to remain with the Company.

On April 11, 2024, upon the recommendation of the Compensation Committee of our board of directors (Compensation Committee), our board of directors approved an amendment to the Adicet Bio, Inc. Second Amended and Restated 2018 Stock Option and Incentive Plan (2018 Plan), and as proposed to be amended (Amended 2018 Plan) subject to stockholder approval, to, among other things, increase the aggregate number of shares authorized for issuance under the 2018 Plan by 5,000,000 shares, plus on January 1, 2025 and each January 1, thereafter, the number of shares authorized for issuance shall be increased by the lesser of 5% of the number of shares of common stock issued and outstanding (inclusive of shares of common stock issuable upon the exercise of our outstanding pre-funded warrants) on the immediately preceding December 31, or such lesser number as determined by the Compensation Committee. A copy of the Amended 2018 Plan is attached as Annex A to this Proxy Statement and is incorporated herein by reference.

This amendment was designed to enhance the flexibility of the Compensation Committee in granting stock options and other awards to the Company’s employees, non-employee directors and other key persons and to ensure that we can continue to grant stock options and other awards to such persons at levels determined to be appropriate by the Compensation Committee. We anticipate that if our request to increase the share reserve is approved by our stockholders, it will be sufficient to provide equity incentives to attract, retain, and motivate executives and employees for the next one to two years; however the share reserve may last longer or shorter depending on our hiring needs and fluctuations in our stock price, among other things. Approval of this Proposal No. 2 is contingent on the approval of Proposal No. 3, providing for an increase in the authorized number of shares of common stock. If Proposal No. 3 is not approved, Proposal No. 2 will not be adopted. Assuming the approval of Proposal No. 3, approval of this Proposal No. 2 will become effective following the filing of the charter amendment with the Secretary of State of the State of Delaware.

In determining the size of the requested increase to the 2018 Plan, the Compensation Committee considered that the increase of 5,000,000 shares represents approximately 6.1% of the common stock outstanding and that the resulting total overhang of approximately 19.3 million shares represents approximately 23.5% of common stock outstanding, positioning us slightly below the median of similarly-sized industry peer companies.

As of April 9, 2024, there were stock options to acquire 12,712,774 shares of common stock outstanding under our equity compensation plans and other grants (9,828,518 shares under our 2018 Plan, 890,566 shares under our 2015 Stock Incentive Plan (2015 Plan), 22,987 shares under our 2014 Plan, 1,472,200 shares under our 2022 Inducement Equity Plan (Inducement Plan) to new hires as inducement grants made in accordance with Nasdaq Listing Rule 5635(c)) and 498,503 shares that are non-plan inducement grants, with a weighted average exercise price of $8.44 ($7.82 under our 2018 Plan, $11.37 under our 2015 Plan, $1.61 under our 2014 Plan, $8.60 under our Inducement Plan and $15.38 for non-plan inducement grants) and a weighted average remaining term of 8.46 years (8.62 under our 2018 Plan, 7.10 under our 2015 Plan, 5.12 under our 2014 Plan, 8.85 under our Inducement Plan and 7.08 for our non-plan inducement grants). In addition, as of April 9, 2024, there were 791,420 restricted stock full value awards outstanding under our equity compensation plans. As of April 9, 2024, there were 272,865 shares of common stock available for awards under our 2018 Plan, which does not reflect the additional 5,000,000 shares reserved under the Amended 2018 Plan as set forth in this proposal. The proposed increase will allow for equity awards to be granted out of the share pool for a period of approximately 1-2 years.

In addition, on January 26, 2024, the Compensation Committee approved to the individuals noted below, effective upon the Board and shareholder approval of the Amended 2018 Plan (the Effective Date of the Amended 2018 Plan ), options to acquire up to the number of shares of Common Stock to certain individuals at an exercise price equal to the closing price of the Common Stock on the Effective Date of the Amended 2018 Plan (the Contingent Option Grants). To the extent

stockholder approval of the Amended 2018 Plan is not obtained, the Contingent Option Grants shall be forfeited in their entirety.


Name	Title	Number of Options		Vesting Schedule	Vesting Start Date
Chen Schor	Chief Executive Officer		1,770,427	(1)	January 26, 2024
Nick Harvey	Chief Financial Officer		374,829	(1)	January 26, 2024
Francesco Galimi, M.D., Ph.D.	Chief Medical Officer		375,077	(1)	January 26, 2024
Donald Healey, Ph.D.	Chief Technology Officer		271,595	(1)	January 26, 2024
Blake Aftab, Ph.D.	Chief Scientific Officer		336,911	(1)	January 26, 2024
Other members of senior management team			179,064	(1)	January 26, 2024
Total			3,307,903

(1) The shares subject to this option vests as follows: 1/48th of the shares shall vest in forty-eight (48) equal monthly installments following the Vesting Start Date; provided that the individual maintains a service relationship with the Company on each such vesting date.

Summary of Material Features of the Amended 2018 Plan

If this Proposal No. 2 is approved by our stockholders, the material features of the Amended 2018 Plan are:

•

The maximum number of shares of common stock to be issued under the Amended 2018 Plan is 16,594,548; thereafter, such maximum number shall be cumulatively increased on January 1, 2025 and on each January 1 thereafter by 5% of the number of shares of common stock issued and outstanding (inclusive of shares of common stock issuable upon the exercise of our outstanding pre-funded warrants) on the immediately preceding December 31 (Annual Increase);

•

The maximum number of shares of common stock that may be issued under the Amended 2018 Plan as incentive stock options is 16,594,548, as increased on January 1, 2025 and each January 1 thereafter by the lesser of the Annual Increase or 3,150,000 shares of common stock;

•

The award of stock options (both incentive and non-qualified options), stock appreciation rights, restricted stock, restricted stock units, unrestricted stock, cash-based awards, and dividend equivalent rights is permitted;

•

Shares reacquired on the open market will not be added to the reserved pool under the Amended 2018 Plan;

•

The value of all awards awarded under the Amended 2018 Plan and all other cash compensation paid by us to any non-employee director in any calendar year may not exceed $1,000,000; and

•

The term of the Amended 2018 Plan will expire on June 1, 2033.

Based solely on the closing price of our common stock as reported by Nasdaq on April 9, 2024, which was $2.29, and the maximum number of shares that would have been available for awards as of such date under the Amended 2018 Plan, the maximum aggregate market value of the common stock that could potentially be issued under the Amended 2018 Plan is $26.4 million. The shares of common stock underlying any awards that are forfeited, canceled, held back upon exercise of an option or settlement of an award to cover the exercise price or tax withholding, reacquired by us prior to vesting, satisfied without the issuance of common stock or otherwise terminated, other than by exercise, under the Amended 2018 Plan and the 2017 Stock Incentive Plan (2017 Plan) and the 2015 Stock Incentive Plan (2015 Plan) will be added back to the shares of common stock available for issuance under the Amended 2018 Plan. Shares of common stock repurchased on the open market will not be added back to the shares of common stock available for issuance under the Amended 2018 Plan.

Rationale for Share Increase

The Amended 2018 Plan is critical to our ongoing effort to build stockholder value. Equity incentive awards are an important component of our executive and non-executive employees’ compensation. Our Compensation Committee and our board of directors believe that we must continue to offer a competitive equity compensation program in order to attract, retain and motivate the talented and qualified employees necessary for continued growth and success.

We aim to both properly incentivize our key personnel while also managing our long-term stockholder dilution by limiting the number of equity incentive awards granted annually. Our Compensation Committee carefully monitors our annual net burn rate, total dilution or overhang, and equity expense both in the aggregate and relative to our peer group of similarly-sized companies within the pharmaceuticals, biotechnology and life sciences industry, in order to maximize stockholder value by granting only the number of equity incentive awards that it believes are necessary and appropriate to attract, reward and retain our employees. Our compensation philosophy reflects broad-based eligibility for equity incentive awards for high performing employees. By doing so, we link the interests of those employees with those of our stockholders and motivate our employees to act as owners of the business.

If the stockholders fail to approve an increase to the 2018 Plan, and we do not have sufficient shares to provide equity incentive compensation, we will need to utilize other types of incentive compensation structures in order to retain and incentivize our employees, including compensation structures that require an increased use in cash.

Summary of the Amended 2018 Plan

The following description of certain provisions of the Amended 2018 Plan is intended to be a summary only. The summary is qualified in its entirety by the full text of the Amended 2018 Plan, a copy of which is attached to this Proxy Statement as Annex A and is incorporated herein by reference.

Administration

The Amended 2018 Plan will be administered by the Compensation Committee. The Compensation Committee has full power to select from among the individuals eligible for awards, the individuals to whom awards will be granted, to make any combination of awards to participants, and to determine the specific terms and conditions of each award, subject to the provisions of the Amended 2018 Plan. The Compensation Committee may delegate to the chief executive officer or one or more executive officers the authority to grant awards to employees who are not subject to the reporting and other provisions of Section 16 of the Exchange Act, subject to certain limitations and guidelines.

Eligibility; Plan Limits

All full-time and part-time officers, employees, non-employee directors and consultants are eligible to participate in the Amended 2018 Plan, subject to the discretion of the administrator. As of April 9, 2024, approximately 165 individuals were eligible to participate in the Amended 2018 Plan, which includes 7 executive officers, 143 employees who are not executive officers, 8 non-employee directors and 7 consultants. There are certain limits on the number of awards that may be granted under the Amended 2018 Plan. For example, no more than 16,594,548 shares of common stock (as increased each year by the lesser of 3,150,000 shares or the Annual Increase and subject in each case to adjustment for stock splits and similar events) may be granted in the form of incentive stock options.

Director Compensation Limit

The Amended 2018 Plan provides that the value of all awards awarded under the Amended 2018 Plan and all other cash compensation paid by the Company to any non-employee director in any calendar year shall not exceed $1,000,000.

Stock Options

The Amended 2018 Plan permits the granting of (1) options to purchase common stock intended to qualify as incentive stock options under Section 422 of the Internal Revenue Code (Code) and (2) options that do not so qualify. Options granted under the Amended 2018 Plan will be non-qualified options if they fail to qualify as incentive options or

exceed the annual limit on incentive stock options. Incentive stock options may only be granted to employees of the Company and its subsidiaries. Non-qualified options may be granted to any persons eligible to receive incentive options and to non-employee directors and consultants. The option exercise price of each option will be determined by the Compensation Committee but may not be less than 100% of the fair market value of the common stock on the date of grant. Fair market value for this purpose will be determined by reference to the price of the shares of common stock on Nasdaq. The exercise price of an option may not be reduced after the date of the option grant without stockholder approval, other than to appropriately reflect changes in our capital structure.

The term of each option will be fixed by the Compensation Committee and may not exceed ten years from the date of grant. The Compensation Committee will determine at what time or times each option may be exercised. Options may be made exercisable in installments and the exercisability of options may be accelerated by the Compensation Committee. In general, unless otherwise permitted by the Compensation Committee, no option granted under the Amended 2018 Plan is transferable by the optionee other than by will or by the laws of descent and distribution or pursuant to a domestic relations order, and options may be exercised during the optionee’s lifetime only by the optionee, or by the optionee’s legal representative or guardian in the case of the optionee’s incapacity.

Upon exercise of options, the option exercise price must be paid in full either in cash, by certified or bank check or other instrument acceptable to the Compensation Committee or by delivery (or attestation to the ownership) of shares of common stock that are beneficially owned by the optionee and that are not subject to risk of forfeiture. Subject to applicable law, the exercise price may also be delivered to the Company by a broker pursuant to irrevocable instructions to the broker from the optionee. In addition, non-qualified options may be exercised using a net exercise feature which reduces the number of shares issued to the optionee by the number of shares with a fair market value equal to the exercise price.

To qualify as incentive options, options must meet additional federal tax requirements, including a $100,000 limit on the value of shares subject to incentive options that first become exercisable by a participant in any one calendar year.

Stock Appreciation Rights

The Compensation Committee may award stock appreciation rights subject to such conditions and restrictions as the Compensation Committee may determine. Stock appreciation rights entitle the recipient to shares of common stock or cash equal to the value of the appreciation in the stock price over the exercise price. The exercise price may not be less than the fair market value of the common stock on the date of grant. The term of a stock appreciation right may not exceed ten years.

Restricted Stock

The Compensation Committee may award shares of common stock to participants subject to such conditions and restrictions as the Compensation Committee may determine. These conditions and restrictions may include the achievement of certain performance goals and/or continued employment with us through a specified restricted period. During the vesting period, restricted stock awards may be credited with dividend equivalent rights (but dividend equivalents payable with respect to restricted stock awards with vesting tied to the attainment of performance criteria shall not be paid unless and until such performance conditions are attained).

Restricted Stock Units (RSUs)

The Compensation Committee may award restricted stock units to participants. Restricted stock units are ultimately payable in the form of shares of common stock or cash subject to such conditions and restrictions as the Compensation Committee may determine. These conditions and restrictions may include the achievement of certain performance goals and/or continued employment with the Company through a specified vesting period. In the Compensation Committee’s sole discretion, it may permit a participant to make an advance election to receive a portion of his or her future cash compensation otherwise due in the form of a restricted stock unit award, subject to the participant’s compliance with the procedures established by the Compensation Committee and requirements of Section 409A of the Code. During the deferral period, the deferred stock awards may be credited with dividend equivalent rights.

Unrestricted Stock Awards

The Compensation Committee may also grant shares of common stock that are free from any restrictions under the Amended 2018 Plan. Unrestricted stock may be granted to any participant in recognition of past services or other valid consideration and may be issued in lieu of cash compensation due to such participant.

Dividend Equivalent Rights

The Compensation Committee may grant dividend equivalent rights to participants, which entitle the recipient to receive credits for dividends that would be paid if the recipient had held specified shares of common stock. Dividend equivalent rights granted as a component of another award (other than a stock option or stock appreciation right) may be paid only if the related award becomes vested. Dividend equivalent rights may be settled in cash, shares of common stock or a combination thereof, in a single installment or installments, as specified in the award.

Cash-Based Awards

The Compensation Committee may grant cash bonuses under the Amended 2018 Plan to participants. The cash bonuses may be subject to the achievement of certain performance goals.

Performance Share Awards

The Compensation Committee may grant performance share awards to any participant which entitle the recipient to receive shares of common stock upon the achievement of certain performance goals and such other conditions as the Compensation Committee shall determine.

Change of Control Provisions

In the event of a “sale event,” as defined in the Amended 2018 Plan, awards under the Amended 2018 Plan may be assumed, continued or substituted. In the event that awards are not assumed, continued or substituted, except as otherwise provided by the Compensation Committee in the award agreement, upon the effective time of the sale event, all awards with time-based conditions will become vested and exercisable upon the sale event, and awards with conditions and restrictions relating to the attainment of performance goals may become vested and non-forfeitable in connection with a sale event in the Compensation Committee’s discretion or to the extent specified in the relevant award agreement. In addition, we may make or provide for payment, in cash or in kind, to participants holding options and stock appreciation rights equal to the difference between the per share cash consideration and the exercise price of the options or stock appreciation rights. The Compensation Committee shall also have the option to make or provide for a payment, in cash or in kind, to grantees holding other awards in an amount equal to the per share cash consideration multiplied by the number of vested shares under such awards. All awards will terminate in connection with a sale event unless they are assumed by the successor entity.

Adjustments for Stock Dividends, Stock Splits, Etc.

The Amended 2018 Plan requires the Compensation Committee to make appropriate adjustments to the number of shares of common stock that are subject to the Amended 2018 Plan, to certain limits in the Amended 2018 Plan, and to any outstanding awards to reflect stock dividends, stock splits, extraordinary cash dividends and similar events (including the reverse stock split to be effected in connection with the Merger).

Tax Withholding

Participants in the Amended 2018 Plan are responsible for the payment of any federal, state or local taxes that we are required by law to withhold upon the exercise of options or stock appreciation rights or vesting of other awards. The Compensation Committee may require that tax withholding obligations satisfied by withholding shares of common stock to be issued pursuant to exercise or vesting. The Compensation Committee may also require our tax withholding obligation to be satisfied, in whole or in part, by an arrangement whereby a certain number of shares issued pursuant to any award are immediately sold and proceeds from such sale are remitted to us in an amount that would satisfy the withholding amount due.

Amendments and Termination

Our board of directors may at any time amend or discontinue the Amended 2018 Plan and the Compensation Committee may at any time amend or cancel any outstanding award for the purpose of satisfying changes in the law or for any other lawful purpose. However, no such action may adversely affect any rights under any outstanding award without the holder’s consent. To the extent required under the rules of Nasdaq, any amendments that materially change the terms of the Amended 2018 Plan will be subject to approval by our stockholders. However, the Compensation Committee is specifically authorized, without the consent of stockholders, to reduce the exercise price of outstanding options or stock appreciation right or effect repricing through the cancellation of outstanding awards in exchange for cash or other awards. Amendments shall also be subject to approval by our stockholders if and to the extent determined by the Compensation Committee to be required by the Code to preserve the qualified status of incentive options.

Effective Date of Plan

The Amended 2018 Plan, as amended and restated, was approved by our board of directors on April 17, 2023. Awards of incentive options may be granted under the Amended 2018 Plan until April 17, 2033. No other awards may be granted under the Amended 2018 Plan after the date that is ten years from the Amended 2018 Plan, as amended and restated is approved by our stockholders.

New Plan Benefits

Because the grant of awards under the Amended 2018 Plan is at the discretion of the Compensation Committee and our board of directors, we cannot determine the dollar value or number of shares of common stock that will in the future be received by or allocated to any participant in the Amended 2018 Plan. However, on January 26, 2024, the Compensation Committee approved the Contingent Option Grants. The following table provides information concerning the Contingent Option Grants made to each of the following persons and groups: each named executive officer; all current executive officers, as a group; all current directors who are not executive officers, as a group; and all current employees who are not executive officers, as a group. The Contingent Option Grants will be automatically cancelled and will be of no further force and effect in the event that stockholder approval of the Amended 2018 Plan is not obtained.


	Contingent Option Grants
Name and Position	Exercise Price ($)			Number of Awards (#)
Chen Schor, President and Chief Executive Officer		(1	)		1,770,427
Nick Harvey, Chief Financial Officer		(1	)		374,829
Donald Healey, Chief Technology Officer		(1	)		271,595
All current executive officers, as a group		(1	)		3,128,839
All current directors who are not executive officers, as a group		(1	)		—
All current employees who are not executive officers, as a group		(1	)		179,064

(1) All Contingent Option Grants shall have an exercise price equal to the closing price of the Common Stock on the Effective Date of the Amended 2018 Plan.

Plan Benefits

The following table sets forth, for each of the individuals and various groups indicated, the total number of awards that have been granted under the Amended 2018 Plan as of April 9, 2024 (including the Contingent Option Awards).


Name and Position	Number of Shares (#)
Chen Schor, President and Chief Executive Officer		5,533,598
Nick Harvey, Chief Financial Officer		1,331,959
Donald Healey, Chief Technology Officer		1,031,572
All current executive officers, as a group		10,079,424
All current directors who are not executive officers, as a group		661,500
Each nominee for election as a director