SCHLEIFER LEONARD S has filed 36 insider transactions across 1 company since May 2023.
Most recent transaction: a option exercise of 28570 shares of REGENERON PHARMACEUTICALS, INC. ($REGN) on December 31, 2025.
Activity breakdown: 0 open-market purchases and 20 sales.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dec. 31, 2025 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | M | 2020 Performance Stock Units | 28570 | $0.00 | 595,077.0000 | 136,200,000 | 4.58% | 0.02% |
| Dec. 31, 2025 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | F | Common Stock | 28570 | $772.09 | 687,981.0000 | 136,200,000 | 3.99% | 0.02% |
| Dec. 31, 2025 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | M | Common Stock | 28570 | $0.00 | 716,551.0000 | 136,200,000 | 4.15% | 0.02% |
| Dec. 9, 2025 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | M | Non-Qualified Stock Option (right to buy) | 172723 | $0.00 | 0.0000 | 136,200,000 | 100.00% | 0.13% |
| Dec. 9, 2025 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | F | Common Stock | 155145 | $701.51 | 687,981.0000 | 136,200,000 | 18.40% | 0.11% |
| Dec. 9, 2025 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | M | Common Stock | 172723 | $555.67 | 843,126.0000 | 136,200,000 | 25.76% | 0.13% |
| June 12, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | C | Class A Stock | 1000 | $0.00 | 1,725,565.0000 | 134,199,999 | 0.06% | 0.00% |
| June 11, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 7321 | $1015.28 | 687,238.0000 | 134,199,999 | 1.05% | 0.01% |
| June 11, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 1743 | $1016.04 | 685,495.0000 | 134,199,999 | 0.25% | 0.00% |
| June 12, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 14879 | $1015.30 | 670,616.0000 | 134,199,999 | 2.17% | 0.01% |
| June 12, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 270 | $1016.62 | 670,346.0000 | 134,199,999 | 0.04% | 0.00% |
| June 12, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | C | Common Stock | 1000 | $0.00 | 671,346.0000 | 134,199,999 | 0.15% | 0.00% |
| June 12, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 1000 | $1025.27 | 670,346.0000 | 134,199,999 | 0.15% | 0.00% |
| June 6, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 787 | $1015.02 | 694,559.0000 | 134,199,999 | 0.11% | 0.00% |
| May 17, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 22687 | $979.22 | 695,489.0000 | 134,199,999 | 3.16% | 0.02% |
| May 17, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 143 | $980.07 | 695,346.0000 | 134,199,999 | 0.02% | 0.00% |
| May 15, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 1081 | $981.50 | 719,877.0000 | 134,199,999 | 0.15% | 0.00% |
| May 15, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 235 | $982.66 | 719,642.0000 | 134,199,999 | 0.03% | 0.00% |
| May 15, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 250 | $983.91 | 719,392.0000 | 134,199,999 | 0.03% | 0.00% |
| May 15, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 305 | $984.00 | 719,087.0000 | 134,199,999 | 0.04% | 0.00% |
| May 15, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 281 | $985.72 | 718,806.0000 | 134,199,999 | 0.04% | 0.00% |
| May 15, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 103 | $986.57 | 718,703.0000 | 134,199,999 | 0.01% | 0.00% |
| May 15, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 228 | $987.46 | 718,475.0000 | 134,199,999 | 0.03% | 0.00% |
| May 15, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 299 | $988.76 | 718,176.0000 | 134,199,999 | 0.04% | 0.00% |
| May 14, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 2302 | $980.10 | 729,117.0000 | 134,199,999 | 0.31% | 0.00% |
| May 13, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | M | Non-Qualified Stock Option (right to buy) | 203204 | $0.00 | 0.0000 | 134,199,999 | 100.00% | 0.15% |
| May 15, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 7864 | $979.05 | 721,253.0000 | 134,199,999 | 1.08% | 0.01% |
| May 15, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 295 | $980.64 | 720,958.0000 | 134,199,999 | 0.04% | 0.00% |
| May 14, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | S | Common Stock | 22698 | $979.16 | 731,419.0000 | 134,199,999 | 3.01% | 0.02% |
| May 13, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | F | Common Stock | 144433 | $976.79 | 754,117.0000 | 134,199,999 | 16.07% | 0.11% |
| May 13, 2024 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | M | Common Stock | 203204 | $399.66 | 898,550.0000 | 134,199,999 | 29.22% | 0.15% |
| Dec. 11, 2023 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | F | Common Stock | 12841 | $844.09 | 695,330.0000 | 130,400,000 | 1.81% | 0.01% |
| Dec. 11, 2023 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | M | Common Stock | 25155 | $0.00 | 708,171.0000 | 130,400,000 | 3.68% | 0.02% |
| Dec. 11, 2023 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | Bd. Co-Chair, President & CEO | M | 2019 Performance Stock Units | 25155 | $0.00 | 0.0000 | 130,400,000 | 100.00% | 0.02% |
| May 15, 2023 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | President & CEO | G | Common Stock | 53807 | $0.00 | 683,016.0000 | 130,400,000 | 7.30% | 0.04% |
| May 15, 2023 | REGENERON PHARMACEUTICALS, INC. | $REGN | SCHLEIFER LEONARD S | President & CEO | G | Common Stock | 53807 | $0.00 | 683,016.0000 | 130,400,000 | 8.55% | 0.04% |