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 2020Sequoia Financial AdvisorsSell-37420$203
Q4 2020Renaissance Technologies LLCSell-167,410904,952$437,191
Q4 2020Polen Capital ManagementBuy65,1472,002,804$967,575
Q4 2020ARK InvestBuy451,729451,818$218,278
Q3 2020Sequoia Financial AdvisorsBuy457457$256
Q3 2020Renaissance Technologies LLCBuy182,2621,072,362$600,287
Q3 2020Polen Capital ManagementBuy93,1231,937,657$1,084,662
Q2 2020Sequoia Financial AdvisorsSell-5190$347
Q2 2020Renaissance Technologies LLCBuy402,738890,100$555,111
Q2 2020Polen Capital ManagementBuy123,5321,844,534$1,150,343
Q1 2020Sequoia Financial AdvisorsSell-40519$253
Q1 2020Renaissance Technologies LLCBuy198,962487,362$237,974
Q1 2020Polen Capital ManagementBuy44,7081,721,002$840,348
Q4 2019Renaissance Technologies LLCSell-110,418288,400$108,288
Q4 2019Polen Capital ManagementBuy34,0841,676,294$629,415
Q4 2019ARK InvestSell-39,98489$33
Q4 2019Parnassus Endeavor FundSell-480,000145,000$54,445
Q3 2019Renaissance Technologies LLCBuy60,856398,818$110,632
Q3 2019Polen Capital ManagementBuy57,0971,642,210$455,549
Q3 2019ARK InvestBuy11,48040,073$11,116
Q2 2019ARK InvestBuy15,35628,593$8,950
Q2 2019Renaissance Technologies LLCBuy129,700337,962$105,782
Q2 2019Polen Capital ManagementSell-17,4481,585,113$496,140
Q2 2019Parnassus Endeavor FundBuy465,000625,000$195,625
Q1 2019Parnassus Endeavor FundBuy160,000160,000$65,699
Q1 2019Renaissance Technologies LLCSell-141,600208,262$85,517
Q1 2019Polen Capital ManagementBuy117,3061,602,561$658,044
Q1 2019ARK InvestSell-68413,237$5,435
Q4 2018Renaissance Technologies LLCBuy81,800349,862$130,673
Q4 2018Polen Capital ManagementSell-3,2371,485,255$554,743

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.