Leonard S. Schleifer serves as Executive at REGENERON PHARMACEUTICALS INC, where they oversee executive responsibilities. Since joining the company, Leonard S. Schleifer has executed 273 insider transactions totaling $461.4M, demonstrating a bearish approach to their equity position. Their most recent transaction on Dec 31, 2025 involved exercising options for 28,570 shares valued at $0.
Leonard S. Schleifer currently holds 595,077 shares of REGENERON PHARMACEUTICALS INC (REGN), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Leonard S. Schleifer has been a net seller of REGN stock. They have purchased $0 and sold $461.4M worth of shares.
Leonard S. Schleifer's most recent insider trade was on Dec 31, 2025, when they sold 28,570 shares at $0.00 per share.
Get notified when new Form 4 filings are submitted
| $772.09 |
| Discretionary |
| Dec 31, 2025 | REGN | $0 | Option Exercise | 28,570 | $N/A | Discretionary |
| Dec 9, 2025 | REGN | $108.8M | Payment | 155,145 | $701.51 | Discretionary |
| Dec 9, 2025 | REGN | $96.0M | Option Exercise | 172,723 | $555.67 | Discretionary |
| Jun 12, 2024 | REGN | $1.0M | Sale | 1,000 | $1025.27 | Planned |
| Jun 12, 2024 | REGN | $15.1M | Sale | 14,879 | $1015.30 | Planned |
| Jun 12, 2024 | REGN | $274.5K | Sale | 270 | $1016.62 | Planned |
| Jun 12, 2024 | REGN | $0 | Conversion | 1,000 | $N/A | Planned |
| Jun 11, 2024 | REGN | $1.8M | Sale | 1,743 | $1016.04 | Planned |
| Jun 11, 2024 | REGN | $7.4M | Sale | 7,321 | $1015.28 | Planned |
| Jun 6, 2024 | REGN | $798.8K | Sale | 787 | $1015.02 | Planned |
| May 17, 2024 | REGN | $140.2K | Sale | 143 | $980.07 | Planned |
| May 17, 2024 | REGN | $22.2M | Sale | 22,687 | $979.22 | Planned |
| May 15, 2024 | REGN | $225.1K | Sale | 228 | $987.46 | Planned |
| May 15, 2024 | REGN | $101.6K | Sale | 103 | $986.57 | Planned |
| May 15, 2024 | REGN | $277.0K | Sale | 281 | $985.72 | Planned |
| May 15, 2024 | REGN | $300.1K | Sale | 305 | $984.00 | Planned |
| May 15, 2024 | REGN | $246.0K | Sale | 250 | $983.91 | Planned |
| May 15, 2024 | REGN | $230.9K | Sale | 235 | $982.66 | Planned |
| May 15, 2024 | REGN | $1.1M | Sale | 1,081 | $981.50 | Planned |
| May 15, 2024 | REGN | $289.3K | Sale | 295 | $980.64 | Planned |
| May 15, 2024 | REGN | $7.7M | Sale | 7,864 | $979.05 | Planned |
| May 15, 2024 | REGN | $295.6K | Sale | 299 | $988.76 | Planned |
| May 14, 2024 | REGN | $2.3M | Sale | 2,302 | $980.10 | Planned |
| May 14, 2024 | REGN | $22.2M | Sale | 22,698 | $979.16 | Planned |
| May 13, 2024 | REGN | $141.1M | Payment | 144,433 | $976.79 | Planned |
| May 13, 2024 | REGN | $81.2M | Option Exercise | 203,204 | $399.66 | Planned |
| Dec 11, 2023 | REGN | $0 | Option Exercise | 25,155 | $N/A | Discretionary |
| Dec 11, 2023 | REGN | $10.8M | Payment | 12,841 | $844.09 | Discretionary |