Over the trailing 90 days insiders are balanced — $0 bought against $0 sold across 0 open-market Form-4 transactions. Much insider selling is scheduled (10b5-1); read the asymmetry, not any single print.
| Insider | Role | Type | Shares | Value | Date |
|---|---|---|---|---|---|
| Murphy Nicole | officer: Head of Pharm Ops and Tech | Buy | +3 | $585 | Feb 12, 2026 |
| Singhal Priya | officer: Head of Development | Sell | −2,660 | $531.5K | Feb 09, 2026 |
| Singhal Priya | officer: Head of Development | Sell | −748 | $134.1K | Feb 02, 2026 |
| Insider | Role | Action | Shares | Price | Value | Trade date | Filing |
|---|---|---|---|---|---|---|---|
| Murphy Nicole | officer: Head of Pharm Ops and Tech | Buy | 3 | $195.04 | $585.11 | Feb 12, 2026 | Feb 17, 2026 |
| Singhal Priya | officer: Head of Development | Sell | 2,660 | $199.83 | $531.55K | Feb 09, 2026 | Feb 10, 2026 |
| Singhal Priya | officer: Head of Development | Sell | 748 | $179.30 | $134.12K | Feb 02, 2026 | Feb 03, 2026 |
Schedule 13D / 13G — investors holding more than 5% of BIIB-US.
| Filed | Reporting person | Form | Type | Aggregate owned | % Class | Sole voting | Shared voting | Citizenship | |
|---|---|---|---|---|---|---|---|---|---|
| Oct 16, 2024 | STATE STREET CORPORATION | — | HC | — | +5.00% | 0 | 4.74M | MA | SEC → |
| Aug 07, 2023 | Biogen Inc. | — | CO | — | +23.40% | 0 | 8.94M | — | SEC → |
| Mar 07, 2022 | (1) BlackRock, Inc. | — | HC | — | +9.40% | 12.08M | 0 | Delaware | SEC → |
| Feb 10, 2022 | PRIMECAP Management Company | — | IA | — | +10.73% | 15.23M | 0 | 177 E. Colorado Blvd., 11th Floor, Pasadena, CA 91105 | SEC → |
| Feb 09, 2022 | The Vanguard Group - 23-1945930 | — | IA | — | +7.85% | 0 | 238.44K | Pennsylvania | SEC → |
| Feb 08, 2022 | (1) BlackRock, Inc. | — | HC | — | +9.40% | 0 | 0 | Delaware | SEC → |
institutional_holders for BIIB-US.