REGENERON PHARMACEUTICALS (REGN) Stock Institutional Trading Activity


REGENERON PHARMACEUTICALS (REGN) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Renaissance Technologies LLC, Longleaf Partners, Dodge & Cox Stock Fund, Sound Shore Management, and Sequoia Financial Advisors. 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
Q4 2025Renaissance Technologies LLCSell-266,0809,082$7,010,123
Q4 2025Longleaf PartnersBuy21,185165,792$127,969,871
Q3 2025Sound Shore ManagementBuy115,028115,028$64,676,793
Q3 2025Sequoia Financial AdvisorsBuy8932,654$1,492,242
Q3 2025Parnassus Endeavor FundSell-61101,023$56,802,202
Q3 2025Longleaf PartnersSell-15,974144,607$81,308,178
Q3 2025Renaissance Technologies LLCBuy230,100275,162$154,715,338
Q3 2025ARK InvestSell-46412,142$6,827,330
Q3 2025Dodge & Cox Stock FundBuy724,5624,550,845$2,558,803,618
Q2 2025Sequoia Financial AdvisorsBuy1461,761$924,648
Q2 2025Scion Asset ManagementBuy15,00015,000$7,875,000
Q2 2025Renaissance Technologies LLCSell-33,83945,062$23,657,550
Q2 2025Parnassus Endeavor FundSell-43,916101,084$53,069,100
Q2 2025Longleaf PartnersBuy45,701160,581$84,305,025
Q2 2025ARK InvestSell-1,08812,606$6,618,213
Q2 2025Dodge & Cox Stock FundBuy1,502,1983,826,283$2,008,798,575
Q1 2025Sequoia Financial AdvisorsSell-1341,615$1,024,475
Q1 2025Renaissance Technologies LLCSell-168,84278,901$50,041,381
Q1 2025Longleaf PartnersBuy114,880114,880$72,860,344
Q1 2025Viking Global InvestorsBuy47,86997,739$61,989,006
Q1 2025ARK InvestBuy50213,694$8,685,055
Q1 2025Dodge & Cox Stock FundBuy2,7692,324,085$1,474,004,430
Q4 2024Sequoia Financial AdvisorsBuy91,749$1,245,990
Q4 2024Renaissance Technologies LLCBuy36,320247,743$176,474,771
Q4 2024ARK InvestSell-1,95913,192$9,397,287
Q4 2024Dodge & Cox Stock FundBuy9,3812,321,316$1,653,543,026
Q3 2024Sequoia Financial AdvisorsBuy2181,740$1,829,107
Q3 2024Renaissance Technologies LLCBuy26,261211,423$222,256,315
Q3 2024Viking Global InvestorsSell-1,030,81249,870$52,425,339
Q3 2024ARK InvestSell-71415,151$15,927,779

Frequently asked questions about REGN activity

  • Which institutional owners are buying REGN?

    Institutional owners buying REGN 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 REGN activity?

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

  • Is institutional interest in REGN increasing?

    Institutional interest in REGN 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.