Leonard S. Schleifer
President & CEO at Regeneron Pharmaceuticals Inc.
Sits on 1 board. Last updated September 28, 2026
Time on boards
- Boards served
- 1
- Current seats
- 1
- Board service
- 3 years
- Director since
- 2023
3 years of board service in total across 1 board, counting each seat separately. Longest: Regeneron Pharmaceuticals Inc., 3 years.
Regeneron Pharmaceuticals Inc.
Director · Bd. Co-Chair, President & CEO
Chief executive roles
Regeneron Pharmaceuticals Inc.
· President & CEO
Dates unknown
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Dec 31, 2025 | Regeneron Pharmaceuticals Inc. | Option exercise | +28,570 | — | — |
| Dec 31, 2025 | Regeneron Pharmaceuticals Inc. | Shares withheld for tax | −28,570 | $772.09 | $22,058,611 |
| Dec 9, 2025 | Regeneron Pharmaceuticals Inc. | Option exercise | +172,723 | $555.67 | $95,976,989 |
| Dec 9, 2025 | Regeneron Pharmaceuticals Inc. | Shares withheld for tax | −155,145 | $701.51 | $108,835,769 |
| Jun 12, 2024 | Regeneron Pharmaceuticals Inc. | Open-market sale | −14,879 | $1,015.30 | $15,106,649 |
| Jun 12, 2024 | Regeneron Pharmaceuticals Inc. | Open-market sale | −270 | $1,016.62 | $274,487 |
| Jun 12, 2024 | Regeneron Pharmaceuticals Inc. | Derivative conversion | +1,000 | — | — |
| Jun 12, 2024 | Regeneron Pharmaceuticals Inc. | Open-market sale | −1,000 | $1,025.27 | $1,025,270 |
| Jun 11, 2024 | Regeneron Pharmaceuticals Inc. | Open-market sale | −7,321 | $1,015.28 | $7,432,865 |
| Jun 11, 2024 | Regeneron Pharmaceuticals Inc. | Open-market sale | −1,743 | $1,016.04 | $1,770,958 |
| Jun 6, 2024 | Regeneron Pharmaceuticals Inc. | Open-market sale | −787 | $1,015.02 | $798,821 |
| May 17, 2024 | Regeneron Pharmaceuticals Inc. | Open-market sale | −22,687 | $979.22 | $22,215,564 |
| May 17, 2024 | Regeneron Pharmaceuticals Inc. | Open-market sale | −143 | $980.07 | $140,150 |
| May 15, 2024 | Regeneron Pharmaceuticals Inc. | Open-market sale | −7,864 | $979.05 | $7,699,249 |
| May 15, 2024 | Regeneron Pharmaceuticals Inc. | Open-market sale | −295 | $980.64 | $289,289 |
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