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ALNY · Alnylam Pharmaceuticals, Inc.

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Market Cap
$31.73B
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: 790
Total Value: $40,770,157,071
Total Shares: 135,435,539
Showing 1–100 of 821 holdings by value · page 1 of 9

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 790 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
39.4%
Sep 2023 → Jun 2026 · range 39.4% – 48.2%
−0.3 pts
Top 10
55.4%
Sep 2023 → Jun 2026 · range 55.4% – 64.1%
−2.3 pts
HHI
419
Sep 2023 → Jun 2026 · range 419 – 572
Broadly held−14

Quarterly Activity

vs Mar 31, 2026
New
88
Increased
324
Decreased
282
Sold Out
97
Unchanged
96
Holder count: -9
Institutional value: -5.6%
Shares held: +3.8%

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 821
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1178670 CUSIP 02043Q107 13F (30d) 615 filings 588 filers Visit website Investor relations