REGENERON PHARMACEUTICALS (REGN) Institutional Ownership Changes & 13F Activity

REGENERON PHARMACEUTICALS (REGN) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Dodge & Cox Stock Fund, Renaissance Technologies LLC, Longleaf Partners, Sound Shore Management, and Parnassus Endeavor Fund.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2026Dodge & Cox Stock FundSell-138,1204,458,238$3,444,613,008
Q1 2026Renaissance Technologies LLCBuy57,72066,802$51,613,897
Q1 2026Longleaf PartnersSell-35,130130,662$100,954,687
Q1 2026Sound Shore ManagementSell-24,927150,960$116,637,734
Q1 2026Parnassus Endeavor FundBuy95097,495$75,328,537
Q1 2026Sequoia Financial AdvisorsBuy2403,189$2,464,031
Q4 2025Renaissance Technologies LLCSell-266,0809,082$7,010,123
Q4 2025Sound Shore ManagementBuy60,859175,887$135,761,899
Q4 2025Dodge & Cox Stock FundBuy45,5134,596,358$3,547,790,849
Q4 2025Longleaf PartnersBuy21,185165,792$127,969,871
Q4 2025ARK InvestSell-12,032110$84,651
Q4 2025Parnassus Endeavor FundSell-4,47896,545$74,520,189
Q4 2025Sequoia Financial AdvisorsBuy2952,949$2,276,257
Q3 2025Dodge & Cox Stock FundBuy724,5624,550,845$2,558,803,618
Q3 2025Renaissance Technologies LLCBuy230,100275,162$154,715,338
Q3 2025Sound Shore ManagementBuy115,028115,028$64,676,793
Q3 2025Longleaf PartnersSell-15,974144,607$81,308,178
Q3 2025Sequoia Financial AdvisorsBuy8932,654$1,492,242
Q3 2025ARK InvestSell-46412,142$6,827,330
Q3 2025Parnassus Endeavor FundSell-61101,023$56,802,202
Q2 2025Dodge & Cox Stock FundBuy1,502,1983,826,283$2,008,798,575
Q2 2025Longleaf PartnersBuy45,701160,581$84,305,025
Q2 2025Parnassus Endeavor FundSell-43,916101,084$53,069,100
Q2 2025Renaissance Technologies LLCSell-33,83945,062$23,657,550
Q2 2025Scion Asset ManagementBuy15,00015,000$7,875,000
Q2 2025ARK InvestSell-1,08812,606$6,618,213
Q2 2025Sequoia Financial AdvisorsBuy1461,761$924,648
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

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.

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