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 2018ARK InvestSell-9,31913,921$5,199
Q3 2018Renaissance Technologies LLCSell-214,408268,062$108,308
Q3 2018Polen Capital ManagementBuy4,8581,488,492$601,410
Q3 2018ARK InvestBuy4,65823,240$9,390
Q2 2018ARK InvestBuy15,25718,582$6,411
Q2 2018Polen Capital ManagementBuy64,4931,483,634$511,839
Q1 2018Polen Capital ManagementBuy29,5961,419,141$488,695
Q1 2018ARK InvestBuy5643,325$1,145
Q1 2018Renaissance Technologies LLCSell-97,092482,470$166,143
Q4 2017ARK InvestBuy5302,761$1,038
Q4 2017Renaissance Technologies LLCBuy485,600579,562$217,892
Q4 2017Polen Capital ManagementBuy15,9311,389,545$522,413
Q3 2017Sequoia Financial AdvisorsSell-153559$250
Q3 2017ARK InvestBuy9972,231$998
Q3 2017Renaissance Technologies LLCSell-138,11493,962$42,012
Q3 2017Polen Capital ManagementSell-212,7061,373,614$614,170
Q2 2017Sequoia Financial AdvisorsBuy12712$350
Q2 2017ARK InvestBuy5441,234$606
Q2 2017Polen Capital ManagementBuy108,4131,586,320$779,105
Q1 2017ARK InvestBuy68690$267
Q1 2017Renaissance Technologies LLCSell-18,484232,076$89,932
Q1 2017Polen Capital ManagementBuy137,2581,477,907$572,704
Q4 2016ARK InvestBuy622622$228
Q4 2016Sequoia Financial AdvisorsBuy173700$257
Q4 2016Renaissance Technologies LLCBuy39,798250,560$91,978
Q4 2016Polen Capital ManagementBuy529,3481,340,649$492,139
Q3 2016Polen Capital ManagementBuy23,431811,301$326,159
Q2 2016Renaissance Technologies LLCSell-6,200210,762$73,604
Q2 2016Polen Capital ManagementBuy81,780787,870$275,148
Q1 2016Renaissance Technologies LLCBuy109,700216,962$78,202

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.