X0306 4 2023-02-13 0 0001622229 Cogent Biosciences, Inc. COGT 0001709773 Green John L. C/O COGENT BIOSCIENCES, INC. 275 WYMAN STREET, 3RD FLOOR WALTHAM MA 02451 0 1 0 0 Chief Financial Officer Stock Option (Right to Buy) 13.63 2023-02-13 4 A 0 150000 0.00 A 2033-02-13 Common Stock 150000 150000 D This stock option shall vest in equal monthly installments over a four year period. Exhibit 24 - Power of Attorney /s/ Evan D. Kearns, Attorney-in-Fact 2023-02-15