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 2024Dodge & Cox Stock FundSell-3,7512,311,935$2,430,398,549
Q2 2024Sequoia Financial AdvisorsBuy731,522$1,599,774
Q2 2024Renaissance Technologies LLCBuy19,800185,162$194,610,817
Q2 2024ARK InvestSell-2,34815,865$16,674,439
Q2 2024Dodge & Cox Stock FundSell-44,1782,315,686$2,433,855,457
Q1 2024Renaissance Technologies LLCSell-77,700165,362$159,159
Q1 2024Sequoia Financial AdvisorsSell-6501,449$1,394,617
Q1 2024ARK InvestSell-9,51818,213$17,529,940
Q1 2024Dodge & Cox Stock FundSell-7,8162,359,864$2,271,345,501
Q4 2023Renaissance Technologies LLCBuy81,000243,062$213,479
Q4 2023Sequoia Financial AdvisorsBuy9002,099$1,843,811
Q4 2023ARK InvestSell-927,731$24,355,445
Q4 2023Dodge & Cox Stock FundSell-5,3182,367,680$2,079,509,667
Q3 2023Renaissance Technologies LLCBuy73,862162,062$133,371
Q3 2023Sequoia Financial AdvisorsSell-11,199$986,943
Q3 2023ARK InvestSell-4,51327,740$22,829,049
Q3 2023Dodge & Cox Stock FundSell-21,3572,372,998$1,952,882,434
Q2 2023Renaissance Technologies LLCSell-26,70088,200$63,375
Q2 2023Sequoia Financial AdvisorsSell-261,200$862,248
Q2 2023ARK InvestSell-1,33832,253$23,175,199
Q2 2023Dodge & Cox Stock FundBuy9,6542,394,355$1,720,439,842
Q1 2023Renaissance Technologies LLCSell-76,541114,900$94,410
Q1 2023Sequoia Financial AdvisorsBuy1741,226$1,007,368
Q1 2023ARK InvestSell-46233,591$27,600,717
Q1 2023Dodge & Cox Stock FundBuy161,6422,384,701$1,959,437,271
Q4 2022Renaissance Technologies LLCSell-16,959191,441$138,123
Q4 2022Sequoia Financial AdvisorsBuy6681,052$758,906
Q4 2022ARK InvestSell-2,88834,053$24,568,899
Q4 2022Dodge & Cox Stock FundSell-63,4502,223,059$1,603,914,838
Q3 2022Sequoia Financial AdvisorsSell-94384$265

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.