Charles Elliott Sigal - 20 May 2026 Form 4 Insider Report for ALNYLAM PHARMACEUTICALS, INC. (ALNY)

Reporting relationship: Director
Issuer ticker: ALNY
Reported as of: 20 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 22 May 2026, 16:20:46 UTC
Prior SEC filing: 02 Jun 2025
Next SEC filing: 28 May 2026
Source filing: View source filing
Reporting owner signature: Brett Budzinski, Attorney-in-Fact For: Charles Elliott Sigal

Key filing fact

Charles Elliott Sigal filed Form 4 for ALNYLAM PHARMACEUTICALS, INC. (ALNY) on 22 May 2026.

Key facts

This page summarizes Charles Elliott Sigal's Form 4 filing for ALNYLAM PHARMACEUTICALS, INC. (ALNY).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 22 May 2026, 16:20.

Change

Previous filing in this sequence was filed on 02 Jun 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001661908 Primary reporting owner

Sigal Charles Elliott

Relationship: Director
Address: 675 WEST KENDALL STREET, CAMBRIDGE
Signature: Brett Budzinski, Attorney-in-Fact For: Charles Elliott Sigal
Signature date: 22 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ALNY transaction

Common Stock

Award

Transaction value
Shares: +671
Change %: +87%
Price: $0.000000^*
Shares after: 1,446
Date: 20 May 2026
Ownership: Direct
Footnotes: F1

ALNY holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 2,000
Date: 20 May 2026
Ownership: by Trust
Footnotes: F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ALNY transaction Derivative

Stock Option (Right to Buy)

Award

Transaction value
Shares: +1,441
Change %
Price: $0.000000^*
Shares after: 1,441
Date: 20 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 1,441
Exercise price: $298.48
Footnotes: F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote 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.

Footnote F2

Shares held by Sigal Family Investments, LLC, of which the reporting person is Managing Member.

Footnote F3

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.