ACET Adicet Bio Inc

*As of March 2, 2021 (the “Event Date”), Abingworth LLP (“Abingworth”) may be deemed to beneficially own an aggregate of 1,640,721 shares of common stock, par value $0.0001 per share (the “Common Stock”), of Adicet Bio, Inc. (the “Issuer”) held by Abingworth Bioventures 8 LP (“ABV 8”). Abingworth Bioventures 8 GP LP (“Abingworth GP”) serves as the general partner of ABV 8. Abingworth General Partner 8 LLP, serves as the general partner of Abingworth GP. ABV 8 (acting by its general partner Abingworth GP, acting by its general partner Abingworth General Partner 8 LLP) has delegated to Abingworth, all investment and dispositive power over the securities held by ABV 8.  Abingworth holds the reported securities indirectly through ABV 8.  Based on the information from the Issuer and other public information, there were 31,318,990 shares of Common Stock outstanding as of the Event Date, thus, as of the Event Date, for purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, Abingworth may be deemed to beneficially own 5.2% of the Common Stock deemed issued and outstanding.

*Consists of 1,640,721 shares of Common Stock held directly by ABV 8. As of the Event Date, for purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, ABV 8 may be deemed to beneficially own 5.2% of the Common Stock deemed issued and outstanding.

The foregoing beneficial ownership percentage is based upon 31,318,990 shares of Common Stock issued and outstanding as of the Event Date based on information received from the Issuer and other public information.

This Schedule 13D (the “Schedule 13D”) relates to shares of common stock, par value $0.0001 per share (the “Common Stock”), of Adicet Bio, Inc. (the “Issuer”). The Issuer’s principal executive offices are located at 500 Boylston Street, 12^th Floor, Boston, MA 02116.

This statement is being filed on behalf of Abingworth Bioventures 8, LP (“ABV 8”), and Abingworth LLP (“Abingworth” together with ABV 8, the “Reporting Persons”). Abingworth is the investment manager of ABV 8.

Abingworth Bioventures 8 GP LP, a Scottish limited partnership, serves as the general partner of ABV 8.  Abingworth General Partner 8 LLP, an English limited liability partnership (together with Abingworth Bioventures 8 GP LP, the “General Partners”), serves as the general partner of Abingworth Bioventures 8 GP LP.  ABV 8 (acting by its general partner Abingworth Bioventures 8 GP LP, acting by its general partner Abingworth General Partner 8 LLP) has delegated to Abingworth all investment and dispositive power over the securities held by ABV 8.  An investment committee of Abingworth, currently comprised of Andrew Sinclair, Timothy Haines, Kurt von Emster, Bali Muralidhar, Brian Gallagher and Genghis Lloyd-Harris (collectively the “Investment Committee”), approves investment and voting decisions by a specified majority vote, and no individual member has the sole control or voting power over the securities held by ABV 8. Each of Abingworth, Abingworth Bioventures 8 GP LP, Abingworth General Partner 8 LLP, and each member of the Investment Committee disclaims beneficial ownership of the common stock held by ABV 8.

The address of the principal business office of each of the Reporting Persons is c/o Abingworth LLP, Princes House, 38 Jermyn Street, London, England SW1Y 6DN.

The principal business of ABV 8 is to invest in and assist growth-oriented businesses in the life science and biomedical industries. The principal business of Abingworth is to serve as the investment manager to certain investment funds, including ABV 8.

None of the Reporting Persons, the General Partners or any of their respective executive officers has, during the last five (5) years, been convicted in a criminal proceeding.

None of the Reporting Persons, the General Partners or any of their executive officers has, during the last five years, been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

ABV 8 is a limited partnership organized under the laws of England. Abingworth is a limited liability partnership organized under the laws of England.

On February 12, 2021, ABV 8 purchased 1,640,721 shares of Common Stock in a registered public offering of the Issuer. ABV 8 purchased the Common Stock with its investment capital for an aggregate purchase price of approximately $21,329,373, which represents a per share purchase price of $13.00.

The Reporting Persons acquired the securities reported herein for investment in the ordinary course of business because of their belief that the Issuer represents an attractive investment based on the Issuer’s business prospects and strategy. The Reporting Persons reserve the right to acquire, or cause to be acquired, additional securities of the Issuer, to dispose of, or cause to be disposed of, such securities at any time or to formulate other purposes, plans or proposals regarding the Issuer or any of its securities, to the extent deemed advisable in light of general investment and trading policies of the Reporting Persons, market conditions or other factors.

Dr. Andrew Sinclair is a Partner and Portfolio Manager of Abingworth and was appointed to the Board of Directors (the “Board”) of the Issuer on March 2, 2021 (the “Event Date”).

Except as set forth herein, the Reporting Persons do not have any plan or proposal that would relate to, or result in, any of the matters set forth under subsections (a) through (j) of Item 4 of Schedule 13D.

Based on the information from the Issuer and other public information, there were 31,318,990 shares of Common Stock outstanding as of the Event Date. Abingworth may be deemed to beneficially own an aggregate of 1,640,721 shares of Common Stock of the Issuer. The number of shares of Common Stock reported above consists of 1,640,721 shares of Common Stock held by ABV 8. Abingworth, as the investment manager of ABV 8, may be deemed to beneficially own the 1,640,721 shares of Common Stock held by ABV 8. Thus, as of the Event Date, for purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, Abingworth may be deemed to beneficially own 5.2% of the shares of Common Stock deemed issued and outstanding. Ownership reported herein excludes options to purchase up to 28,828 shares of Common Stock (the “Options”) issued to Dr. Sinclair pursuant to his Board appointment. The Options are exercisable for ten (10) years at an exercise price of $15.75 per share. 33% of the shares of Common Stock shall become exercisable on March 2, 2022, and the remaining 67% of the shares of Common Stock shall vest in twenty-four (24) equal monthly installments thereafter.

Except as described herein, during the past sixty (60) days on or prior to the Event Date, and from the Event Date to the date of filing of this report, there were no other purchases or sales of common stock, or securities convertible into or exchangeable for common stock, by the Reporting Persons or any person or entity for which the Reporting Persons possess voting or dispositive control over the securities thereof.

Except as otherwise set forth in this Schedule 13D, there are no contracts, arrangements, understandings or similar relationships existing with respect to the securities of the Issuer and any of the Reporting Persons.

The following exhibit is incorporated into this Schedule 13D:  

Signature

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: March 8, 2021 

Attention: Intentional misstatements or omissions of fact constitute
Federal criminal violations (See 18 U.S.C. 1001).