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ALNYLAM PHARMACEUTICALS INC (ALNY)
Institutional ownership, SEC filings and insider activity
Sector: Healthcare & Pharma · SEC CIK 0001178670 · EDGAR filings · Updated 2026-06-03
ALNYLAM PHARMACEUTICALS INC (ALNY) has reported institutional ownership of 96.9%, with 782 institutional managers holding positions valued at $42.4B per the latest 13F reporting period.
Latest updates
- 2026-06-03 — Insider transaction reported (Form 4)
- 2026-06-03 — Insider transaction reported (Form 4)
- 2026-06-03 — Initial insider ownership filed (Form 3)
- 2026-06-01 — Notice of proposed sale filed (Form 144)
- 2026-05-27 — Current report (8-K) filed
- 2026-05-22 — Insider transaction reported (Form 4)
- 2026-05-22 — Insider transaction reported (Form 4)
- 2026-05-22 — Insider transaction reported (Form 4)
Institutional ownership overview
According to SEC 13F filings tracked by Sightfile, ALNYLAM PHARMACEUTICALS INC has 782 institutional holders and institutional ownership of 96.9%.
| # | Institution | Reported value | % of tracked total |
|---|---|---|---|
| 1 | FMR LLC | $4.82B | 11.4% |
| 2 | Capital World Investors | $3.57B | 8.4% |
| 3 | BlackRock, Inc. | $3.46B | 8.1% |
| 4 | Capital Research Global Investors | $3.13B | 7.4% |
| 5 | VANGUARD PORTFOLIO MANAGEMENT LLC | $2.15B | 5.1% |
| 6 | JPMORGAN CHASE & CO | $2.00B | 4.7% |
| 7 | VANGUARD CAPITAL MANAGEMENT LLC | $1.97B | 4.6% |
| 8 | T. Rowe Price Investment Management, Inc. | $1.72B | 4.0% |
| 9 | STATE STREET CORP | $1.10B | 2.6% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | $884.6M | 2.1% |
Full holder history and quarter-over-quarter changes are available inside the app.
Insider activity
Insiders reported 495 transactions (2 buys, 422 sells) across 16 reporting insiders, with a net reported value of −$105.5M.
Quarterly net insider value, as reported in Form 4 filings.
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See full history, cross-references and alerts on SightfileData sources: SEC EDGAR (filings, 13F, FTD), aggregated by Sightfile. Page updated 2026-06-03.