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ALNY · Alnylam Pharmaceuticals, Inc.

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Market Cap
$31.98B
Shares
133.81M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 786
Total Value: $40,708,325,511
Total Shares: 135,230,139
Showing 1–100 of 817 holdings by value · page 1 of 9

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 786 13F filers · Δ vs Mar 31, 2026
Top Holder
11.1%
Sep 2023 → Jun 2026 · range 10.7% – 13.8%
−0.1 pts
Top 5
39.5%
Sep 2023 → Jun 2026 · range 39.5% – 48.2%
−0.2 pts
Top 10
55.5%
Sep 2023 → Jun 2026 · range 55.5% – 64.1%
−2.2 pts
HHI
421
Sep 2023 → Jun 2026 · range 421 – 572
Broadly held−13

Quarterly Activity

vs Mar 31, 2026
New
88
Increased
321
Decreased
281
Sold Out
99
Unchanged
96
Holder count: -11
Institutional value: -5.7%
Shares held: +3.6%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 817
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1178670 CUSIP 02043Q107 13F (30d) 607 filings 601 filers Visit website Investor relations