Alnylam Pharmaceuticals Ownership & Insider Activity

Alnylam Pharmaceuticals (ALNY) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 0.5% of shares outstanding. Institutional investors hold 96.2%. Over the past 90 days, insiders made 1 sale worth $399K.

Shares Outstanding

133.809M

Shares Float

100.437M

Insider Shares Owned

675.932K

Insider % Owned

0.5%

Institutional Shares Held

128.685M

Institutional % Held

96.2%

Ownership Breakdown

Net Insider Activity by Month

Purchases (90d)

Sales (90d)

$399K total

Net Activity

Net Selling

Net Value (90d)

-$399K

Alnylam Pharmaceuticals Insider Transactions (Last 6 Months)

Date	Insider	Title	Type	Shares	Price	Value
Oct 2, 2026	Bryan Supran	EVP, CLO AND SECRETARY	SELL	1.758K	$226.88	$399K
Jun 1, 2026	David E.I. Pyott	DIRECTOR	SELL-OPTIONS	—	$299.18	$1.1M

Date	Member	Party	Chamber	Action	Amount
Aug 11, 2026	Cory A. Booker	D	Senate	Sale	$1,001 - $15,000
May 12, 2025	Jefferson Shreve	R	House	Sale	$15,001 - $50,000
Jan 29, 2024	Josh Gottheimer	D	House	Sale	$1,001 - $15,000
Jan 11, 2024	Josh Gottheimer	D	House	Purchase	$1,001 - $15,000
Dec 11, 2023	Josh Gottheimer	D	House	Sale	$1,001 - $15,000