Michael S. Brown serves as Executive at REGENERON PHARMACEUTICALS INC, where they oversee executive responsibilities. Since joining the company, Michael S. Brown has executed 303 insider transactions totaling $73.4M, demonstrating a bearish approach to their equity position. Their most recent transaction on Jan 2, 2026 involved receiving (via award) 1,962 shares valued at $0.
Michael S. Brown currently holds 1,962 shares of REGENERON PHARMACEUTICALS INC (REGN), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Michael S. Brown has been a net seller of REGN stock. They have purchased $0 and sold $73.4M worth of shares.
Michael S. Brown's most recent insider trade was on Jan 2, 2026, when they sold 1,962 shares at $0.00 per share.
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| $N/A |
| Discretionary |
| Jun 14, 2024 | REGN | $1.6M | Sale | 1,535 | $1040.00 | Planned |
| Jun 14, 2024 | REGN | $960.3K | Option Exercise | 1,535 | $625.60 | Planned |
| May 28, 2024 | REGN | $1.1M | Sale | 1,172 | $974.86 | Planned |
| May 28, 2024 | REGN | $733.2K | Option Exercise | 1,172 | $625.60 | Planned |
| Jan 2, 2024 | REGN | $0 | Award | 135 | $N/A | Discretionary |
| Dec 27, 2023 | REGN | $1.8M | Sale | 2,049 | $898.00 | Planned |
| Dec 27, 2023 | REGN | $989.0K | Option Exercise | 2,049 | $482.68 | Planned |
| Apr 21, 2023 | REGN | $2.5M | Sale | 3,070 | $798.42 | Planned |
| Apr 21, 2023 | REGN | $1.6M | Option Exercise | 3,070 | $520.01 | Planned |
| Feb 6, 2023 | REGN | $398.5K | Sale | 500 | $797.00 | Discretionary |
| Feb 6, 2023 | REGN | $1.6M | Option Exercise | 3,071 | $520.01 | Discretionary |
| Feb 6, 2023 | REGN | $2.5M | Sale | 3,071 | $798.00 | Discretionary |
| Jan 27, 2023 | REGN | $520 | Option Exercise | 1 | $520.01 | Discretionary |
| Jan 27, 2023 | REGN | $747 | Sale | 1 | $747.00 | Discretionary |
| Jan 6, 2023 | REGN | $1.6M | Option Exercise | 3,070 | $520.01 | Discretionary |
| Jan 6, 2023 | REGN | $2.3M | Sale | 3,070 | $747.14 | Discretionary |
| Jan 3, 2023 | REGN | $0 | Award | 165 | $N/A | Discretionary |
| Nov 8, 2022 | REGN | $909.5K | Option Exercise | 2,431 | $374.12 | Discretionary |
| Nov 8, 2022 | REGN | $1.3M | Sale | 1,764 | $748.48 | Discretionary |
| Nov 8, 2022 | REGN | $754.9K | Option Exercise | 1,564 | $482.68 | Discretionary |
| Nov 8, 2022 | REGN | $94.7K | Sale | 126 | $751.23 | Discretionary |
| Nov 8, 2022 | REGN | $374.2K | Sale | 500 | $748.49 | Discretionary |
| Nov 8, 2022 | REGN | $153.6K | Sale | 200 | $768.11 | Discretionary |
| Nov 8, 2022 | REGN | $154.2K | Sale | 201 | $767.25 | Discretionary |
| Nov 8, 2022 | REGN | $154.1K | Sale | 201 | $766.74 | Discretionary |
| Nov 8, 2022 | REGN | $76.5K | Sale | 100 | $765.19 | Discretionary |
| Nov 8, 2022 | REGN | $152.8K | Sale | 200 | $764.23 | Discretionary |
| Nov 8, 2022 | REGN | $152.6K | Sale | 200 | $763.19 | Discretionary |