Leonard S. Schleifer

Companies

• Regeneron PharmaceuticalsChair Dec 13, 2023 to now¹
• Regeneron PharmaceuticalsChief executive officer Oct 28, 2009 to now²
• Regeneron PharmaceuticalsBoard member Mar 8, 2006 to May 17, 2023³
• Regeneron PharmaceuticalsPresident Mar 8, 2006 to May 8, 2013³

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• Regeneron Pharmaceuticals REGN254,508 shares⁴$201.2M at $790.61Jan 5, 2026

As of each latest filing. The line shows shares held over time.

Recent filings

• Dec 31, 2025Shares withheld for tax 28,570 shares at $772.09 of Regeneron Pharmaceuticals⁴
• Dec 31, 2025Exercised options 28,570 shares of Regeneron Pharmaceuticals⁴
• Dec 9, 2025Shares withheld for tax 155,145 shares at $701.51 of Regeneron Pharmaceuticals⁵
• Dec 9, 2025Exercised options 172,723 shares at $555.67 of Regeneron Pharmaceuticals⁵
• Jun 12, 2024Sold 1,000 shares at $1,025.27 of Regeneron Pharmaceuticals⁶
• Jun 12, 2024Converted 1,000 shares of Regeneron Pharmaceuticals⁶
• Jun 12, 2024Sold 270 shares at $1,016.62 of Regeneron Pharmaceuticals⁶
• Jun 12, 2024Sold 14,879 shares at $1,015.30 of Regeneron Pharmaceuticals⁶
• Jun 11, 2024Sold 1,743 shares at $1,016.04 of Regeneron Pharmaceuticals⁶
• Jun 11, 2024Sold 7,321 shares at $1,015.28 of Regeneron Pharmaceuticals⁶
• Jun 6, 2024Sold 787 shares at $1,015.02 of Regeneron Pharmaceuticals⁷
• May 17, 2024Sold 143 shares at $980.07 of Regeneron Pharmaceuticals⁸
• May 17, 2024Sold 22,687 shares at $979.22 of Regeneron Pharmaceuticals⁸
• May 15, 2024Sold 299 shares at $988.76 of Regeneron Pharmaceuticals⁹
• May 15, 2024Sold 228 shares at $987.46 of Regeneron Pharmaceuticals⁹
• May 15, 2024Sold 103 shares at $986.57 of Regeneron Pharmaceuticals⁹
• May 15, 2024Sold 281 shares at $985.72 of Regeneron Pharmaceuticals⁹
• May 15, 2024Sold 305 shares at $984.00 of Regeneron Pharmaceuticals⁹
• May 15, 2024Sold 250 shares at $983.91 of Regeneron Pharmaceuticals⁹
• May 15, 2024Sold 235 shares at $982.66 of Regeneron Pharmaceuticals⁹
• May 15, 2024Sold 1,081 shares at $981.50 of Regeneron Pharmaceuticals⁹
• May 15, 2024Sold 295 shares at $980.64 of Regeneron Pharmaceuticals⁹
• May 15, 2024Sold 7,864 shares at $979.05 of Regeneron Pharmaceuticals⁹
• May 14, 2024Sold 2,302 shares at $980.10 of Regeneron Pharmaceuticals⁹
• May 14, 2024Sold 22,698 shares at $979.16 of Regeneron Pharmaceuticals⁹