X0206 3 2020-10-22 0 0001822462 Foghorn Therapeutics Inc. FHTX 0001831749 Bellon Steven F. 500 TECHNOLOGY SQUARE, STE 700 CAMBRIDGE MA 02139 0 1 0 0 See Remarks Common Stock 128378 D Stock Option (Right to Buy) 0.73 2029-01-30 Common Stock 4053 D Stock Option (Right to Buy) 3.72 2029-02-13 Common Stock 29729 D Stock Option (Right to Buy) 8.77 2030-08-18 Common Stock 43243 D Stock Option (Right to Buy) 8.77 2030-08-20 Common Stock 64864 D The option vested at a rate of 6.25% of the underlying shares beginning on April 1, 2018 and thereafter on the first day of each calendar quarter until the option is fully vested. The option vested as to 25% of the underlying shares of common stock on January 30, 2020, the first anniversary of the of the vesting commencement date, and at a rate of 6.25% of the underlying shares thereafter on the first day of each calendar quarter following such first anniversary until the option is fully vested. The option shall vest as to 25% of the underlying shares of common stock on August 17, 2021, the first anniversary of the of the vesting commencement date, and at a rate of 6.25% of the underlying shares thereafter on the first day of each calendar quarter following such first anniversary until the option is fully vested. The option shall vest as to 25% of the underlying shares of common stock on August 17, 2021, the first anniversary of the of the vesting commencement date, and at a rate of 6.25% of the underlying shares thereafter on the first day of each calendar quarter following such first anniversary until the option is fully vested. Senior Vice President, Drug Discovery Exhibit List: Exhibit 24 - Power of Attorney By: /s/ Allan Reine, M.D., Attorney-in-Fact 2020-11-13