PRIMECAP MANAGEMENT CO/CA/ 13D and 13G filings for Biogen Inc.:
- Schedule 13D must be filed within ten days after a person or an organization acquires beneficial ownership of more than 5% of a voting class of a company's equity securities.
- Shares have been adjusted for stock splits.
| Reported DateTime | Transaction Date | Type | Company Symbol | Filed By Symbol | Shares Owned % Owned | Shares Vs. Prev Report | View |
| 2025-11-13 8:28 pm Sale | 2025-09-30 | 13G | BIOGEN INC BIIB | PRIMECAP MANAGEMENT CO/CA/ | 14,954,697 10.200% | -1,309,784 (-8.05%) | Filing |
| 2024-02-12 4:01 pm Purchase | 2023-12-31 | 13G | BIOGEN INC BIIB | PRIMECAP MANAGEMENT CO/CA/ | 16,264,481 11.220% | 563,905 (+3.59%) | Filing |
| 2023-02-09 4:01 pm Sale | 2022-12-31 | 13G | BIOGEN INC BIIB | PRIMECAP MANAGEMENT CO/CA/ | 15,700,576 10.900% | -56,829 (-0.36%) | Filing |
| 2022-02-10 12:21 pm Sale | 2021-12-31 | 13G | BIOGEN INC BIIB | PRIMECAP MANAGEMENT CO/CA/ | 15,757,405 10.730% | -64,661 (-0.41%) | Filing |