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REGENERON PHARMACEUTICALS

REGN

Holders

1

Combined Value

$51.61M

Combined Shares

66,802

Current Price

$612.14

52W High

$821.11

vs 52W High

−25.4%

Investor Activity Chart

Quarterly buys (▲) and sells (▼) by tracked investors. Click a marker to view that investor's portfolio; hover for details. Price line is implied from 13F filings (value ÷ shares), not market data.

$419.75$665.33$910.91$1156.49Q2'24Q3'24Q4'24Q1'25Q2'25Q3'25Q4'25Q1'26Q2 2024 · implied price $1051.03Q3 2024 · implied price $1051.24Q4 2024 · implied price $712.33Q1 2025 · implied price $634.23Q2 2025 · implied price $525.00Q3 2025 · implied price $562.27Q4 2025 · implied price $771.87Q1 2026 · implied price $772.64Jim Simons - Renaissance Technologies · bought 185,162 shares @ ~$1051.03 · Q2 2024 (new position)Andreas Halvorsen - Viking Global Investors · bought 49,870 shares @ ~$1051.24 · Q3 2024 (new position)Jim Simons - Renaissance Technologies · bought 26,261 shares @ ~$1051.24 · Q3 2024Jim Simons - Renaissance Technologies · bought 36,320 shares @ ~$712.33 · Q4 2024Andreas Halvorsen - Viking Global Investors · sold 49,870 shares @ ~$1051.24 · Q4 2024 (sold out)Andreas Halvorsen - Viking Global Investors · bought 97,739 shares @ ~$634.23 · Q1 2025 (new position)Jim Simons - Renaissance Technologies · sold 168,842 shares @ ~$634.23 · Q1 2025Michael Burry - Scion Asset Management · bought 215,000 shares @ ~$525.00 · Q2 2025 (new position)Andreas Halvorsen - Viking Global Investors · sold 97,739 shares @ ~$634.23 · Q2 2025 (sold out)Jim Simons - Renaissance Technologies · sold 33,839 shares @ ~$525.00 · Q2 2025Jim Simons - Renaissance Technologies · bought 230,100 shares @ ~$562.27 · Q3 2025Michael Burry - Scion Asset Management · sold 215,000 shares @ ~$525.00 · Q3 2025 (sold out)Jim Simons - Renaissance Technologies · sold 266,080 shares @ ~$771.87 · Q4 2025Jim Simons - Renaissance Technologies · bought 57,720 shares @ ~$772.64 · Q1 2026BUYSELLIMPLIED PRICE

Held By

Tracked investors currently holding this security, based on each investor's most recent 13F filing. Gain compares the current market price to each investor's estimated average buy price.

InvestorValue% of PortfolioAvg Buy PriceGainLast ActivityAs of
Jim Simons - Renaissance Technologies$51.61M0.08%~$753.82−18.8%BUY Q1 2026Q1 2026

Recent Activity

Latest position changes by tracked investors. Prices are estimates implied from 13F filings.

QuarterInvestorActionEst. ValueEst. Price
Q1 2026Jim Simons - Renaissance TechnologiesBUY+$44.60M~$772.64
Q4 2025Jim Simons - Renaissance TechnologiesSELL−$205.38M~$771.87
Q3 2025Jim Simons - Renaissance TechnologiesBUY+$129.38M~$562.27
Q3 2025Michael Burry - Scion Asset ManagementSOLD OUT−$112.88M~$525.00
Q2 2025Michael Burry - Scion Asset ManagementNEW BUY+$112.88M~$525.00
Q2 2025Andreas Halvorsen - Viking Global InvestorsSOLD OUT−$61.99M~$634.23
Q2 2025Jim Simons - Renaissance TechnologiesSELL−$17.77M~$525.00
Q1 2025Jim Simons - Renaissance TechnologiesSELL−$107.08M~$634.23
Q1 2025Andreas Halvorsen - Viking Global InvestorsNEW BUY+$61.99M~$634.23
Q4 2024Andreas Halvorsen - Viking Global InvestorsSOLD OUT−$52.43M~$1051.24
Q4 2024Jim Simons - Renaissance TechnologiesBUY+$25.87M~$712.33
Q3 2024Andreas Halvorsen - Viking Global InvestorsNEW BUY+$52.43M~$1051.24
Q3 2024Jim Simons - Renaissance TechnologiesBUY+$27.61M~$1051.24
Q2 2024Jim Simons - Renaissance TechnologiesNEW BUY+$194.61M~$1051.03

Ownership History

Aggregate position across all tracked investors per quarter (options excluded). Implied price is the reported value divided by shares held.

PeriodHoldersTotal SharesΔ SharesTotal ValueImplied Price
Q1 2026166,802+635.5%$51.61M$772.64
Q4 202519,082-96.7%$7.01M$771.87
Q3 20251275,162+5.8%$154.72M$562.27
Q2 20252260,062+47.2%$136.53M$525.00
Q1 20252176,640-28.7%$112.03M$634.23
Q4 20241247,743-5.2%$176.47M$712.33
Q3 20242261,293+41.1%$274.68M$1051.24
Q2 20241185,162—$194.61M$1051.03