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 2017Polen Capital ManagementBuy137,2581,477,907$572,704
Q1 2017Renaissance Technologies LLCSell-18,484232,076$89,932
Q1 2017ARK InvestBuy68690$267
Q4 2016Polen Capital ManagementBuy529,3481,340,649$492,139
Q4 2016Renaissance Technologies LLCBuy39,798250,560$91,978
Q4 2016ARK InvestBuy622622$228
Q4 2016Sequoia Financial AdvisorsBuy173700$257
Q3 2016Polen Capital ManagementBuy23,431811,301$326,159
Q2 2016Polen Capital ManagementBuy81,780787,870$275,148
Q2 2016Renaissance Technologies LLCSell-6,200210,762$73,604
Q1 2016Renaissance Technologies LLCBuy109,700216,962$78,202
Q1 2016Polen Capital ManagementBuy80,393706,090$254,503
Q4 2015Renaissance Technologies LLCSell-60,226107,262$58,229
Q4 2015Polen Capital ManagementBuy50,192625,697$339,672
Q3 2015Polen Capital ManagementBuy20,546575,505$267,690
Q3 2015Sequoia Financial AdvisorsBuy10527$245
Q2 2015Polen Capital ManagementSell-11,906554,959$283,101
Q2 2015Sequoia Financial AdvisorsBuy517517$264
Q1 2015Renaissance Technologies LLCBuy140,926167,488$75,617
Q1 2015Polen Capital ManagementBuy24,572566,865$255,928
Q4 2014Polen Capital ManagementSell-9,609542,293$222,476
Q3 2014Viking Global InvestorsSell-1,882,7741,080,682$389,607
Q3 2014Polen Capital ManagementBuy343,312551,902$198,972
Q3 2014Renaissance Technologies LLCBuy23,70026,562$9,576
Q2 2014Viking Global InvestorsBuy1,911,6562,963,456$837,087
Q2 2014Renaissance Technologies LLCSell-67,2002,862$808
Q2 2014Polen Capital ManagementSell-10,573208,590$58,920
Q1 2014Viking Global InvestorsBuy1,051,8001,051,800$315,835
Q1 2014Polen Capital ManagementBuy217,412219,163$65,810
Q4 2013Renaissance Technologies LLCSell-179,45970,062$19,284

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.

Related REGN insights