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
Q3 2022Renaissance Technologies LLCSell-374,662208,400$143,561
Q3 2022ARK InvestSell-18,87036,941$25,448
Q3 2022Dodge & Cox Stock FundBuy21,1752,286,509$1,575,107
Q3 2022Hancock Classic ValueSell-325794$547
Q2 2022Sequoia Financial AdvisorsSell-17478$283
Q2 2022Renaissance Technologies LLCBuy303,200583,062$344,665
Q2 2022ARK InvestSell-1,96255,811$37,100
Q2 2022Dodge & Cox Stock FundBuy28,2712,265,334$1,339,107
Q2 2022Hancock Classic ValueBuy1951,119$661
Q1 2022Sequoia Financial AdvisorsBuy93495$346
Q1 2022Polen Capital ManagementSell-5551,383$966
Q1 2022Renaissance Technologies LLCSell-3,100279,862$195,461
Q1 2022ARK InvestSell-15,22057,773$40,350
Q1 2022Dodge & Cox Stock FundBuy1,957,9412,237,063$1,562,410
Q1 2022Hancock Classic ValueBuy20924$645
Q4 2021Sequoia Financial AdvisorsSell-18402$254
Q4 2021Polen Capital ManagementSell-2171,938$1,224
Q4 2021Renaissance Technologies LLCBuy181,700282,962$178,696
Q4 2021ARK InvestSell-355,15472,993$46,097
Q4 2021Dodge & Cox Stock FundBuy279,122279,122$176,271
Q4 2021Hancock Classic ValueSell-73904$571
Q3 2021Polen Capital ManagementSell-2,000,6492,155$1,304
Q3 2021Renaissance Technologies LLCBuy36,110101,262$61,282
Q3 2021ARK InvestSell-284,901428,147$259,106
Q3 2021Hancock Classic ValueSell-137977$591
Q2 2021ARK InvestSell-505,922713,048$398,266
Q2 2021Hancock Classic ValueSell-1411,114$622
Q1 2021Renaissance Technologies LLCSell-839,80065,152$30,826
Q1 2021ARK InvestBuy767,1521,218,970$576,743
Q1 2021Hancock Classic ValueBuy1,2551,255$594

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.