Alnylam (ALNY) director Stuart Arbuckle reports zero beneficial ownership on Form 3

Rhea-AI Filing Summary

Alnylam Pharmaceuticals, Inc. director Stuart A. Arbuckle filed an initial insider ownership report. This Form 3 indicates that, as of the event date of 01/05/2026, he holds no securities beneficially owned in Alnylam. The filing confirms his role as a director and that the report is filed by one reporting person.

The document also includes a power of attorney, under which Brett Budzinski signed on Arbuckle's behalf. This filing is primarily administrative, establishing Arbuckle’s status as an insider without disclosing any equity ownership or transactions.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Arbuckle Stuart A

(Last) (First) (Middle)

675 WEST KENDALL STREET

HENRI A. TERMEER SQUARE

(Street)

CAMBRIDGE MA 02142

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
01/05/2026

3. Issuer Name and Ticker or Trading Symbol
ALNYLAM PHARMACEUTICALS, INC. [ ALNY ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit List: Exhibit 24 - Power of Attorney

No securities are beneficially owned.

	By: Brett Budzinski, Attorney-in-Fact For: Stuart A. Arbuckle	01/07/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What does the latest Form 3 filing reveal about ALNY director Stuart A. Arbuckle?

The Form 3 shows that director Stuart A. Arbuckle has no securities beneficially owned in Alnylam Pharmaceuticals, Inc. (ALNY) as of 01/05/2026.

What is the relationship of Stuart A. Arbuckle to Alnylam Pharmaceuticals (ALNY)?

Stuart A. Arbuckle is reported as a director of Alnylam Pharmaceuticals, Inc. (ALNY) and is not listed as an officer or 10% owner in this Form 3.

Are any Alnylam (ALNY) shares or derivatives reported as owned in this Form 3?

No. The filing states in the remarks that no securities are beneficially owned, and both the non-derivative and derivative tables contain no reported holdings.

Who signed the Form 3 for Alnylam (ALNY) director Stuart A. Arbuckle?

The Form 3 is signed "By: Brett Budzinski, Attorney-in-Fact For: Stuart A. Arbuckle", indicating it was executed under a power of attorney.

Does this Alnylam (ALNY) Form 3 disclose any insider transactions?

No transactions are disclosed. The Form 3 serves only as an initial statement of beneficial ownership, which is reported as zero.