HAMBURG MARGARET A 4

4 · ALNYLAM PHARMACEUTICALS, INC. · Filed May 22, 2026

AI-generated summary of this filing

Updated May 22, 2026

Alnylam Director Margaret Hamburg Receives 2,112-Share RSU/Derivative Award

What Happened

Margaret A. Hamburg, a director of Alnylam Pharmaceuticals (ALNY), received equity awards on 2026-05-20 totaling 2,112 units: 671 shares granted and 1,441 derivative awards. Both were recorded at $0.00 per share (award/grant), indicating they are compensatory equity awards rather than purchases.

Key Details

Transaction date: 2026-05-20; filing date: 2026-05-22 (appears timely within the usual 2-business-day Form 4 window).
Security/amounts: 671 shares (award) and 1,441 derivative shares (total = 2,112 units); price reported $0.00.
Transaction code: A (award/grant).
Shares owned after transaction: not specified in the provided filing excerpt.
Footnotes:
- F1: The awards include RSUs under the Second Amended and Restated 2018 Stock Incentive Plan; each RSU converts to one share and will vest in full on the earlier of the first anniversary of the grant or certain retirement/resignation events (with a 90-day lookback condition).
- F2: Describes vesting for a stock option (vests in full on the earlier of the first anniversary of the grant or certain retirement/resignation events with the same 90-day condition).

Context

These are compensatory equity awards (RSUs/derivative grants) intended to align the director with shareholder interests; no cash changed hands and no sale or exercise occurred. Derivative awards and RSUs typically convert to shares only upon vesting per the footnoted schedule.

Form 4

Period: 2026-05-20

Director

Transactions

Award
Common Stock
[F1]
2026-05-20+671→ 1,582 total
Award
Stock Option (Right to Buy)
[F2]
2026-05-20+1,441→ 1,441 total
Exercise: $298.48From: 2027-05-20Exp: 2036-05-20→ Common Stock (1,441 underlying)

Footnotes (2)

[F1]These shares are represented by restricted stock units (RSUs) granted under the Second Amended and Restated 2018 Stock Incentive Plan. Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest in full upon the earlier of the first anniversary of the grant date and the date of any earlier retirement or resignation of the Reporting Person, provided such date of retirement or resignation occurs no more than 90 days prior to the first anniversary of the grant date.
[F2]The stock option will vest in full upon the earlier of the first anniversary of the grant date and the date of any earlier retirement or resignation of the Reporting Person, provided such date of retirement or resignation occurs no more than 90 days prior to the first anniversary of the grant date.

Signature

Brett Budzinski, Attorney-in-Fact For: Margaret A. Hamburg|2026-05-22

1 file