BlackRock, Inc. 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 |
| 2025-04-17 09:35 am Sale | 2025-03-31 | 13G | Biogen Inc. BIIB | BlackRock Inc. BLK | 12,506,681 8.500% | -2,140,070 (-14.61%) | Filing |
| 2024-08-07 4:10 pm Purchase | 2024-07-31 | 13G | Biogen Inc. BIIB | BlackRock Inc. BLK | 14,646,751 10.100% | 400,431 (+2.81%) | Filing |
| 2024-01-24 2:27 pm Sale | 2023-12-31 | 13G | Biogen Inc. BIIB | BlackRock Inc. BLK | 14,246,320 9.800% | -13,817 (-0.10%) | Filing |
| 2023-01-24 1:56 pm Purchase | 2022-12-31 | 13G | Biogen Inc. BIIB | BlackRock Inc. BLK | 14,260,137 9.900% | 523,183 (+3.81%) | Filing |
| 2022-03-07 2:51 pm Unchanged | 2021-12-31 | 13G | Biogen Inc. BIIB | BlackRock Inc. BLK | 13,736,954 9.400% | 0 (Unchanged) | Filing |
| 2022-02-08 5:05 pm Purchase | 2021-12-31 | 13G | Biogen Inc. BIIB | BlackRock Inc. BLK | 13,736,954 9.400% | 317,353 (+2.36%) | Filing |
| 2021-01-28 5:56 pm Sale | 2020-12-31 | 13G | Biogen Inc. BIIB | BlackRock Inc. BLK | 13,419,601 8.700% | -2,239,040 (-14.30%) | Filing |