Chirfi Guindo serves as Executive at BIOGEN INC., where they oversee executive responsibilities. Since joining the company, Chirfi Guindo has executed 32 insider transactions totaling $1.4M, demonstrating a bearish approach to their equity position. Their most recent transaction on Jan 26, 2026 involved receiving (via award) 9,865 shares valued at $1.1M.
Chirfi Guindo currently holds 100,615.13 shares of BIOGEN INC. (BIIB), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Chirfi Guindo has been a net seller of BIIB stock. They have purchased $0 and sold $1.4M worth of shares.
Chirfi Guindo's most recent insider trade was on Jan 26, 2026, when they sold 9,865 shares at $107.40 per share.
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| $79.29 |
| Discretionary |
| Aug 4, 2025 | MRK | $2.9M | Option Exercise | 36,903 | $79.29 | Discretionary |
| Aug 5, 2024 | MRK | $2.0M | Payment | 17,412 | $115.20 | Discretionary |
| Aug 5, 2024 | MRK | $4.3M | Option Exercise | 36,901 | $115.20 | Discretionary |
| Aug 3, 2023 | MRK | $1.9M | Payment | 17,989 | $105.70 | Discretionary |
| Aug 3, 2023 | MRK | $3.9M | Option Exercise | 36,901 | $105.70 | Discretionary |
| Feb 18, 2022 | BIIB | $184.4K | Payment | 879 | $209.79 | Discretionary |
| Feb 18, 2022 | BIIB | $0 | Option Exercise | 1,981 | $N/A | Discretionary |
| Feb 12, 2022 | BIIB | $0 | Option Exercise | 1,261 | $N/A | Discretionary |
| Feb 12, 2022 | BIIB | $120.2K | Payment | 560 | $214.59 | Discretionary |
| Feb 12, 2022 | BIIB | $255.1K | Payment | 1,189 | $214.59 | Discretionary |
| Feb 12, 2022 | BIIB | $127.3K | Payment | 593 | $214.59 | Discretionary |
| Feb 12, 2022 | BIIB | $0 | Option Exercise | 1,336 | $N/A | Discretionary |
| Jan 19, 2022 | BIIB | $0 | Award | 3,088 | $N/A | Discretionary |
| Jun 7, 2021 | BIIB | $1.4M | Sale | 3,087 | $440.00 | Discretionary |
| Feb 12, 2021 | BIIB | $132.6K | Payment | 477 | $278.03 | Discretionary |
| Feb 12, 2021 | BIIB | $128.7K | Payment | 463 | $278.03 | Discretionary |
| Feb 12, 2021 | BIIB | $0 | Option Exercise | 1,534 | $N/A | Discretionary |
| Feb 12, 2021 | BIIB | $0 | Option Exercise | 1,622 | $N/A | Discretionary |
| Dec 1, 2020 | BIIB | $52.0K | Payment | 214 | $243.16 | Discretionary |
| Dec 1, 2020 | BIIB | $84.6K | Payment | 348 | $243.16 | Discretionary |
| Dec 1, 2020 | BIIB | $0 | Option Exercise | 481 | $N/A | Discretionary |
| Feb 12, 2020 | BIIB | $0 | Option Exercise | 1,680 | $N/A | Discretionary |
| Feb 12, 2020 | BIIB | $167.2K | Payment | 504 | $331.76 | Discretionary |
| Dec 1, 2019 | BIIB | $48.0K | Payment | 160 | $299.81 | Discretionary |
| Dec 1, 2019 | BIIB | $0 | Option Exercise | 543 | $N/A | Discretionary |
| Dec 1, 2019 | BIIB | $69.3K | Payment | 231 | $299.81 | Discretionary |
| Dec 1, 2018 | BIIB | $59.4K | Payment | 178 | $333.72 | Discretionary |
| Dec 1, 2018 | BIIB | $0 | Option Exercise | 602 | $N/A | Discretionary |