FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Sinclair Andrew
2. Issuer Name and Ticker or Trading Symbol

Adicet Bio, Inc. [ ACET ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__X__ Director                    _____ 10% Owner
_____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle)

C/O ADICET BIO, INC., 500 BOYLSTON STREET, 13TH FLOOR
3. Date of Earliest Transaction (MM/DD/YYYY)

12/8/2021
(Street)

BOSTON, MA 02116
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 12/8/2021  P  500000 A$14.00 2140721 I See Footnote (1)(2)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares

Explanation of Responses:
(1) The shares were purchased from the underwriters in a firm-commitment underwritten public offering of shares of the Issuer's common stock that closed on December 10, 2021. These shares are 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 ("Abingworth GP 8"), serves as the general partner of Abingworth GP. ABV 8 (acting by its general partner Abingworth GP, acting by its general partner Abingworth GP 8) has delegated to Abingworth LLP, all investment and dispositive power over the securities held by ABV 8. The Reporting Person is a Partner and Portfolio Manager of Abingworth LLP.
(2) An investment committee approves investment and voting decisions by a majority vote, and no individual member has the sole control or voting power over the shares held by ABV 8. The Reporting Person is a member of the investment committee of ABV 8. From time to time, the investment committee may delegate investment and voting authority over certain securities held by ABV 8 to employees of Abingworth LLP, subject to the supervision and oversight of the investment committee, including any limits on such authority imposed by the investment committee in its discretion and the right of the investment committee to revoke such authority at any time. The Reporting Person disclaims beneficial ownership of such shares, except to the extent of his pecuniary interest therein, if any.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Sinclair Andrew
C/O ADICET BIO, INC.
500 BOYLSTON STREET, 13TH FLOOR
BOSTON, MA 02116
X



Signatures
/s/ Nick Harvey, Attorney-in-Fact12/10/2021
**Signature of Reporting PersonDate

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