X0206 3 2023-09-18 0 0001662579 C4 Therapeutics, Inc. CCCC 0001992219 Mossler Mark C/O C4 THERAPEUTICS, INC. 490 ARSENAL WAY #120 WATERTOWN MA 02472 0 1 0 0 Chief Accounting Officer Stock Option (Right to Buy) 2.83 2033-07-02 Common Stock 50210 D 25% of the shares underlying this option shall vest and become exercisable on June 21, 2024, with the remainder vesting in 12 equal quarterly installments thereafter, subject to the Reporting Person's continued service on each vesting date. Exhibit 24 - Power of Attorney /s/ Jolie M. Siegel, Attorney-in-Fact 2023-09-19