ALNYLAM PHARMACEUTICALS INC (ALNY) Stock Institutional Trading Activity


ALNYLAM PHARMACEUTICALS INC (ALNY) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q3 2025), investors with some of the largest reported share count changes include Dodge & Cox Stock Fund, Polen Capital Management, Parnassus Endeavor Fund, Sequoia Financial Advisors, and First Eagle U.S. Value. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q3 2025Dodge & Cox Stock FundSell-875,8662,321,230$1,058,480,880
Q3 2025Polen Capital ManagementBuy693693$316,008
Q3 2025Sequoia Financial AdvisorsBuy3894,306$1,963,393
Q3 2025Parnassus Endeavor FundSell-39837,014$16,878,384
Q2 2025Dodge & Cox Stock FundSell-154,6663,197,096$1,042,541,035
Q2 2025Sequoia Financial AdvisorsBuy5223,917$1,277,403
Q2 2025Parnassus Endeavor FundSell-1,33637,412$12,199,679
Q1 2025Dodge & Cox Stock FundSell-188,5003,351,762$905,042,775
Q1 2025Sequoia Financial AdvisorsBuy993,395$916,797
Q4 2024Dodge & Cox Stock FundSell-82,2733,540,262$833,059,051
Q4 2024Sequoia Financial AdvisorsBuy1673,296$775,683
Q3 2024Dodge & Cox Stock FundSell-157,6503,622,535$996,305,801
Q3 2024Sequoia Financial AdvisorsSell-1793,129$860,569
Q2 2024Dodge & Cox Stock FundSell-31,2953,780,185$918,584,955
Q2 2024Sequoia Financial AdvisorsBuy3983,308$803,844
Q1 2024Dodge & Cox Stock FundBuy137,1703,811,480$569,625,686
Q1 2024Sequoia Financial AdvisorsSell-4,8042,910$434,900
Q4 2023Dodge & Cox Stock FundSell-72,8453,674,310$703,299,677
Q4 2023Sequoia Financial AdvisorsBuy4,9117,714$1,476,537
Q3 2023Dodge & Cox Stock FundSell-42,3703,747,155$663,621,151
Q3 2023Sequoia Financial AdvisorsSell-1482,803$496,412
Q3 2023Parnassus Endeavor FundBuy12,77838,748$6,862,271
Q2 2023Dodge & Cox Stock FundSell-105,0103,789,525$719,782,379
Q2 2023Sequoia Financial AdvisorsBuy2,0172,951$560,514
Q1 2023Dodge & Cox Stock FundSell-696,2473,894,535$780,153,251
Q4 2022Dodge & Cox Stock FundSell-298,5154,590,782$1,090,999,342
Q4 2022Sequoia Financial AdvisorsBuy934934$221,933
Q3 2022Dodge & Cox Stock FundSell-369,6594,889,297$978,642
Q3 2022Parnassus Endeavor FundSell-32,06825,970$5,198
Q2 2022Dodge & Cox Stock FundSell-216,7125,258,956$767,019

Frequently asked questions about ALNY activity

  • Which institutional owners are buying ALNY?

    Institutional owners buying ALNY include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in ALNY activity?

    "Buy" means an investor increased their reported position in ALNY compared to the prior reporting period. This reflects growing exposure to ALNYLAM PHARMACEUTICALS INC (ALNY) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in ALNY increasing?

    Institutional interest in ALNY can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.