Alnylam Pharmaceuticals Inc (ALNY)
Healthcare
Biotechnology
205.50 $
+0.0%
vs. previous close
Closing price · As of: 31. Jul 2026
Who owns Alnylam Pharmaceuticals Inc (ALNY)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.6% of the shares are freely tradable; institutional investors hold 102.1%.
Ownership Structure
Institutional ownership
Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings.
102.1%
Insiders
Share of the stock held by the executives, founders and major shareholders of the company itself.
0.2%
Float
Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders.
99.6%
Short % of float
Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices.
5.4%
Shares Outstanding
Total number of shares issued. Price times share count gives market cap.
134Mio.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| FMR Inc | 10.93 | 14,579,166 | -8.3 | 03/31/2026 |
| Vanguard Group Inc | 10.16 | 13,553,932 | -0.1 | 12/31/2025 |
| Capital World Investors | 8.10 | 10,802,348 | -33.7 | 03/31/2026 |
| BlackRock Inc | 7.83 | 10,444,908 | +0.4 | 03/31/2026 |
| Capital Research Global Investors | 7.10 | 9,471,181 | +39.7 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 4.87 | 6,491,280 | +0.0 | 03/31/2026 |
| JPMorgan Chase & Co | 4.74 | 6,323,752 | +34.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.46 | 5,946,706 | +0.0 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| American Funds Growth Fund of Amer A | 6.01 | 8,024,520 | -18.2 | 03/31/2026 |
| Capital Group Growth Fnd of Amer Comp | 6.01 | 8,024,520 | -18.2 | 03/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.