X0206 3 2020-10-01 0 0001662579 C4 Therapeutics, Inc. CCCC 0001825124 Salter Malcolm C/O C4 THERAPEUTICS, INC. 490 ARSENAL WAY, SUITE 200 WATERTOWN MA 02472 1 0 0 0 Series A Preferred Stock Common Stock 11856 D Series B Preferred Stock Common Stock 2823 D Stock Option (Right to Buy) 2.11 2026-07-12 Common Stock 8561 D Shares of Series A Preferred Stock and Series B Preferred Stock are convertible into Common Stock on a 8.4335-to-one basis into the aggregate number of shares of Common Stock shown in Column 3 at any time at the holder's election, and automatically upon the closing of the Issuer's initial public offering without payment or further consideration. The shares have no expiration date. 12.5% of this option vested and became exercisable on December 31, 2016, with the remainder vesting in 28 equal quarterly installments thereafter. Exhibit 24 - Power of Attorney /s/ Jolie M. Siegel, Attorney-in-Fact 2020-10-01