Alan A. Musso - 02 Feb 2026 Form 4 Insider Report for Fulcrum Therapeutics, Inc. (FULC)

Role: Chief Financial Officer
Signature: /s/ Alan Musso
Issuer symbol: FULC
Transactions as of: 02 Feb 2026
Net transactions value: $0
Form type: 4
Filing time: 04 Feb 2026, 16:10:05 UTC
Previous filing: 23 Jul 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Musso Alan A	Chief Financial Officer	C/O FULCRUM THERAPEUTICS, INC., 26 LANDSDOWNE STREET, CAMBRIDGE	/s/ Alan Musso	04 Feb 2026	0001295830

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	FULC	Stock Option (right to buy)	Award	$0	+170,000		$0.000000	170,000	02 Feb 2026	Common Stock	170,000	$10.72	Direct	F1

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

Explanation of Responses:

Id	Content
F1	This option was granted on February 2, 2026 and is scheduled to vest in equal quarterly installments over four years beginning on the vesting commencement date of January 1, 2026, subject to the reporting person's continued service on each such vesting date.