X0206 3 2022-02-14 0 0001822462 Foghorn Therapeutics Inc. FHTX 0001913484 Cavalie Fanny C/O FOGHORN THERAPEUTICS INC. 500 TECHNOLOGY SQUARE, SUITE 700 CAMBRIDGE MA 02139 false true false false Chief Strategy/Bus Ops Officer Common Stock 86992.00 D Stock Options (Right to buy) 16.63 2031-01-27 Common Stock 50000.00 D Stock Options (Right to buy) 14.87 2032-01-25 Common Stock 125000.00 D Stock Options (Right to buy) 8.77 2030-08-18 Common Stock 59459.00 D Stock Options (Right to buy) 3.72 2029-02-13 Common Stock 10135.00 D Stock Options (Right to buy) 0.73 2028-03-27 Common Stock 5575.00 D The options will vest as to 25% of the underlying shares of common stock on January 28, 2023, the first anniversary 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 options will vest as to 25% of the underlying shares of common stock on January 26, 2024, the first anniversary 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 options will vest as to 25% of the underlying shares of common stock on August 17, 2022, the first anniversary 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 vested as to 25% of the underlying shares of common stock on January 30, 2021, the first anniversary 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 vested as to 25% of the underlying shares of common stock on March 19, 2020, the first anniversary 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. /s /Allan Reine, M.D., Attorney-in-Fact 2022-02-24