Alnylam Pharmaceuticals, Inc. (ALNY) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

134,684,000Shares Outstanding
128,611,584Shares held by institutions
$38,838,126,136Value of institutional holdings
95.49%Institutional ownership %
16.91%Shares Changed QoQ
770No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Alnylam Pharmaceuticals, Inc. (NASDAQ:ALNY) has 823 institutional investors with active 13F positions as of December 2025.

767 Institutional Holders

128,611,584 Total Shares Held
Download Data
Owner Name Date Shares Held Change (QoQ) Change (%) Value (USD)
FMR LLC 31 Mar, 2026 14,579,166 -1,322,983 -8.32% $4,823,808,693.00
Capital World Investors 31 Mar, 2026 10,802,348 -5,499,424 -33.74% $3,573,758,048.00
BlackRock, Inc. 31 Mar, 2026 10,444,908 44,034 0.42% $3,455,906,710.00
Capital Research Global Investors 31 Mar, 2026 9,471,181 2,691,473 39.70% $3,133,497,254.00
VANGUARD PORTFOLIO MANAGEMENT LLC 31 Mar, 2026 6,491,280 6,491,280 0.00% $2,147,769,814.00
Jpmorgan Chase & Co 31 Mar, 2026 6,323,752 1,603,753 33.98% $1,998,875,417.00
VANGUARD CAPITAL MANAGEMENT LLC 31 Mar, 2026 5,946,706 5,946,706 0.00% $1,967,586,614.00
T. Rowe Price Investment Management, Inc. 31 Mar, 2026 5,193,324 2,288,337 78.77% $1,718,316.00
State Street Corp 31 Mar, 2026 3,322,698 93,742 2.90% $1,099,381,087.00
GEODE CAPITAL MANAGEMENT, LLC 31 Mar, 2026 2,660,385 9,663 0.36% $884,565,832.00
BAILLIE GIFFORD & CO 31 Mar, 2026 2,493,866 -107,113 -4.12% $825,145,443.00
TWO SIGMA INVESTMENTS, LP 31 Mar, 2026 1,992,577 1,376,457 223.41% $659,283,952.00
WELLINGTON MANAGEMENT GROUP LLP 31 Mar, 2026 1,935,925 306,994 18.85% $640,539,505.00
DODGE & COX 31 Mar, 2026 1,929,253 -35,162 -1.79% $638,331,940.00
AMERICAN CENTURY COMPANIES INC 31 Mar, 2026 1,802,363 317,202 21.36% $596,349,775.00
PRICE T ROWE ASSOCIATES INC /MD/ 31 Mar, 2026 1,432,748 1,432,748 0.00% $474,055.00
Clearbridge Investments, LLC 31 Mar, 2026 1,356,036 759,023 127.14% $448,671,479.00
Orbis Allan Gray Ltd 31 Mar, 2026 1,334,825 -283,394 -17.51% $441,653,547.00
Invesco Ltd. 31 Mar, 2026 1,291,726 -874,114 -40.36% $427,393,317.00
MARSHALL WACE, LLP 31 Mar, 2026 1,099,318 549,396 99.90% $363,731,347.00