Alnylam Pharmaceuticals
ALNY · NASDAQ
Who owns ALNY
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 52.4% of ALNY’s shares.
- Fidelity Management & Research Company LLC10.1%
- Capital World Investors8.3%
- Capital Research Global Investors7.3%
- BlackRock Institutional Trust Company, N.A.5.7%
- Next 6 largest institutions21.0%
- All other shareholders47.6%
| Holder | Shares | % of shares |
|---|---|---|
| Fidelity Management & Research Company LLC | 13.46M | 10.08% |
| Capital World Investors | 11.14M | 8.35% |
| Capital Research Global Investors | 9.75M | 7.30% |
| BlackRock Institutional Trust Company, N.A. | 7.60M | 5.69% |
| Vanguard Portfolio Management, LLC | 6.54M | 4.90% |
| Vanguard Capital Management, LLC | 6.03M | 4.52% |
| T. Rowe Price Investment Management, Inc. | 5.64M | 4.23% |
| Invesco Capital Management LLC | 3.65M | 2.73% |
| State Street Investment Management (US) | 3.56M | 2.66% |
| Geode Capital Management, L.L.C. | 2.64M | 1.97% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| American Funds Growth Fund of America | 7.62M | 5.71% |
| Vanguard Total Stock Market Index Fund | 4.25M | 3.18% |
| American Funds AMCAP Fund | 4.10M | 3.07% |
| Vanguard Mid-Cap Index Fund | 2.89M | 2.16% |
| Invesco QQQ Trust | 2.87M | 2.15% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $1.54M (6 trades) of ALNY on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| SUPRAN BRYAN | Sale | 1.76K | $398.86K |
| Greenstreet Yvonne | Award | 107 | — |
| Cravatt Benjamin | Award | 4.39K | — |
| PYOTT DAVID E I | Option exercise | 3.83K | — |
| PYOTT DAVID E I | Sale | 17 | $5.15K |
| PYOTT DAVID E I | Sale | 495 | $148.86K |
| PYOTT DAVID E I | Sale | 1.22K | $366.44K |
| PYOTT DAVID E I | Sale | 1.18K | $351.22K |
| PYOTT DAVID E I | Sale | 921 | $274.19K |
| PYOTT DAVID E I | Option exercise | 3.83K | — |
Congressional trades
Disclosed by members of Congress over the last 12 months
| Member | Type | Amount | Traded |
|---|---|---|---|
| Cory A BookerSenator | Sale (Full) | $1K–$15K | Aug 11, 2026 |
Short interest
Settled Sep 30, 2026
- Shares short
- 7.71M
- Days to cover
- 6.45
- % of shares outstanding
- 5.78%
- Average daily volume
- 1.20M
- Change since last report
- +7.2%
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