Carlos Costa - 30 Jan 2026 Form 4 Insider Report for Foghorn Therapeutics Inc. (FHTX)

Role: Chief People Officer
Signature: /s/ Michael LaCascia, Attorney-in-Fact for Carlos Costa
Issuer symbol: FHTX
Transactions as of: 30 Jan 2026
Net transactions value: +$1,313,300
Form type: 4
Filing time: 02 Feb 2026, 16:04:42 UTC
Previous filing: 24 Jan 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Costa Carlos	Chief People Officer	99 COOLIDGE AVENUE, SUITE 500, WATERTOWN	/s/ Michael LaCascia, Attorney-in-Fact for Carlos Costa	02 Feb 2026	0001939167

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	FHTX	Stock option (right to buy)	Award	$1,313,300	+230,000		$5.71	230,000	30 Jan 2026	Common Stock	230,000	$5.71	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The option vests as to 25% of the underlying shares of common stock on January 30, 2027, and thereafter at a rate of 6.25% of the underlying shares on the first day of each calendar quarter.