X0407 4 2023-06-01 0 0001720580 Adicet Bio, Inc. ACET 0001265123 DUBIN STEVE C/O ADICET BIO, INC. 200 BERKELEY STREET, 19TH FLOOR BOSTON MA 02116 1 0 0 0 0 Common Stock 2023-06-01 4 A 0 5900 0.00 A 5900 D Stock Option (Right to Buy) 5.195 2023-06-01 4 A 0 26400 0.00 A 2033-05-31 Common Stock 26400 26400 D The Reporting Person was issued Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of Common Stock. The RSUs shall vest in full on the earlier to occur of (a) the first anniversary of the grant date or (b) the date of the next annual meeting of stockholders following the grant date, subject to the Reporting Person's continued service on the Issuer's board of directors. The RSUs may be settled only by delivering shares of Common Stock, and thus, the grant is being reported in Table I as allowed per SEC guidance. These shares shall vest in full on the earlier to occur of (a) the first anniversary of the grant date or (b) the date of the next annual meeting of stockholders following the grant date, subject to the Reporting Person's continued service on the Issuer's board of directors. /s/ Nick Harvey, Attorney-in-Fact 2023-06-02