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Of the 15 tracked institutions holding ALNY, 9 have a 3-year clone track record — 7 of them beat the S&P. Average holder's clone alpha: +3.9pt. It's a gauge of who owns the name, not just how many.
Among the 15 tracked institutional investors we monitor, ALNY (ALNYLAM PHARMACEUTICALS INC) is held with a combined value of $20.36B across 58,826,677 shares. The largest holder is VANGUARD GROUP INC with a position worth $5.39B (0.08% of their portfolio). Fisher Asset Management, LLC opened a new position in the most recent quarter. 7 funds increased their holdings. 7 funds reduced their position.
Total Institutional Value
$20.36B
Total Shares Held
58,826,677
Institutional Holders
15
% of Shares Outstanding
44.4%
of 132.62M shares · SEC 2026-02-06
Days to Cover
3.2-0.5%
5.77M shares short · FINRA 2026-07-15
Tracked 13F institutions hold 44.4% of ALNY's shares outstanding. This is a floor: 13F filings arrive on a ~45-day lag and we track only a subset of institutional filers, so true institutional ownership is higher. Shares-outstanding is the latest SEC cover-page figure (as of 2026-02-06), not a live float.
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | VANGUARD GROUP INC | $5.39B | 0.08% | -0.1% |
| 2 | FMR LLC | $4.82B | 0.25% | -8.3% |
| 3 | BlackRock, Inc. | $3.46B | 0.06% | +0.4% |
| 4 | Capital Research Global Investors | $3.13B | 0.49% | +39.7% |
| 5 | STATE STREET CORP | $1.10B | 0.04% | +2.9% |
| 6 | BAILLIE GIFFORD & CO | $825.15M | 0.84% | -4.1% |
| 7 | WELLINGTON MANAGEMENT GROUP LLP | $640.54M | 0.12% | +18.8% |
| 8 | PRICE T ROWE ASSOCIATES INC /MD/ | $474.06M | 0.05% | -15.9% |
| 9 | AQR CAPITAL MANAGEMENT LLC | $297.87M | 0.14% | -0.7% |
| 10 | MILLENNIUM MANAGEMENT LLC | $163.15M | 0.07% | +470.5% |
| Member | Type | Date |
|---|---|---|
| Jefferson Shreve | Sell | May 12, 2025 |
| Josh Gottheimer | Sell | Jan 29, 2024 |
| Josh Gottheimer | Buy | Jan 11, 2024 |
| Josh Gottheimer | Sell |
As of the latest SEC 13F filings, VANGUARD GROUP INC is the largest institutional holder of ALNY with a position worth $5.39B, representing 0.08% of their portfolio. In total, 15 institutional investors hold ALNY with a combined value of $20.36B.
In the most recent quarter, 1 fund opened a new position in ALNY. Additionally, 7 increased their holdings and 7 reduced their positions.
Institutional investors hold $20.36B worth of ALNY stock across 15 positions. The largest institutional holder is VANGUARD GROUP INC with $5.39B in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For ALNY, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their ALNY positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
| Dec 11, 2023 |
Last Close
$271.77
2026-07-24
YTD
-32.1%
2% of 52-week range
