X0306 4 2020-10-27 0 0001822462 Foghorn Therapeutics Inc. FHTX 0001828724 GOTTSCHALK ADRIAN 500 TECHNOLOGY SQUARE, STE 700 CAMBRIDGE MA 02139 1 1 0 0 See Remarks Common Stock 2020-10-27 4 C 0 25225 A 25225 I See Footnote Series A-2 Convertible Preferred Stock 2020-10-27 4 C 0 18018 D Common Stock 18018 0 I See Footnote Series B Convertible Preferred Stock 2020-10-27 4 C 0 7207 D Common Stock 7207 0 I See Footnote The Series A-2 Convertible Preferred Stock, and Series B Convertible Preferred Stock (collectively, the "Preferred Stock") is convertible into the number of shares of the Registrant's common stock shown in Table II column 7 and has no expiration date. The Preferred Stock automatically converted into common stock upon the closing of the Registrant's initial public offering, which occurred on October 27, 2020. Shares held by the Adrian H. Gottschalk Living Trust dated September 8, 2009, of which the Reporting Person is the trustee. President & Chief Executive Officer By: /s/ Allan Reine, M.D., Attorney-in-Fact 2020-10-29