X0206 3 2020-10-01 0 0001662579 C4 Therapeutics, Inc. CCCC 0001768223 Siegel Jolie C/O C4 THERAPEUTICS, INC. 490 ARSENAL WAY, SUITE 200 WATERTOWN MA 02472 0 1 0 0 Chief Legal Officer Stock Option (Right to Buy) 4.98 2030-07-02 Common Stock 296321 D 20% of this option shall vest and become exercisable on July 1, 2021, with the remainder vesting in 16 equal quarterly installments thereafter. Exhibit 24 - Power of Attorney /s/ Jolie M. Siegel 2020-10-01