Kevin Joseph Fitzgerald - 23 Feb 2026 Form 4 Insider Report for ALNYLAM PHARMACEUTICALS, INC. (ALNY)

Role: CSO & EVP, Head of Research
Signature: By: Brett Budzinski, Attorney-in-Fact For: Kevin Fitzgerald
Issuer symbol: ALNY
Transactions as of: 23 Feb 2026
Net transactions value: $0
Form type: 4
Filing time: 25 Feb 2026, 16:17:11 UTC
Previous filing: 17 Feb 2026
Next filing: 02 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Fitzgerald Kevin Joseph	CSO & EVP, Head of Research	675 WEST KENDALL STREET, HENRI A. TERMEER SQUARE, CAMBRIDGE	By: Brett Budzinski, Attorney-in-Fact For: Kevin Fitzgerald	25 Feb 2026	0001886431

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ALNY	Common Stock	Award	$0	+158	+0.74%	$0.000000	21,422	23 Feb 2026	Direct	F1
holding	ALNY	Common Stock						537	23 Feb 2026	by Managed Account	F2

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

Explanation of Responses:

Id	Content
F1	On February 23, 2026, the People, Culture, and Compensation Committee of the issuer approved the issuance of shares of Company common stock having an aggregate value of USD $100,000 to each employee who completes 20 consecutive years of employment. The shares issued and reported here on Form 4, net of the minimum statutory tax liability, were issued to the reporting person in recognition of 20 years of continuous employment on December 5, 2025.
F2	Reflects shares of ALNY common stock acquired by the Reporting Person under the issuer 401(k) plan as a result of the issuer 401(k) matching contribution program.

Content

On February 23, 2026, the People, Culture, and Compensation Committee of the issuer approved the issuance of shares of Company common stock having an aggregate value of USD $100,000 to each employee who completes 20 consecutive years of employment. The shares issued and reported here on Form 4, net of the minimum statutory tax liability, were issued to the reporting person in recognition of 20 years of continuous employment on December 5, 2025.

Reflects shares of ALNY common stock acquired by the Reporting Person under the issuer 401(k) plan as a result of the issuer 401(k) matching contribution program.