X0508 4 2025-06-17 false 0001822462 Foghorn Therapeutics Inc. FHTX 0001180763 GILL SIMBA 500 TECHNOLOGY SQUARE STE 700 CAMBRIDGE MA 02139 true false false false false Stock Option (right to buy) 4.79 2025-06-17 4 A false 25000.00 4.79 A 2026-06-17 2035-06-16 Common Stock 25000.00 25000.00 D /s/ Michael LaCascia, Attorney-in-Fact for Balkrishan (Simba) Gill 2025-06-17