BIOGEN INC. - BIIB
Ownership (Schedule 13D / 13G) · latest 50 filings
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| Filed | Form | Reporting person | Percent | Shares | SEC |
|---|---|---|---|---|---|
| Apr 06, 2026 | SCHEDULE 13D | — | — | — | View |
| Mar 26, 2026 | SCHEDULE 13G/A | The Vanguard Group | 0.0% | 0 | View |
| Feb 05, 2026 | SCHEDULE 13G | FMR LLC | 6.4% | 9,413,062 | View |
| Feb 05, 2026 | SCHEDULE 13G | Abigail P. Johnson | 6.4% | 9,413,062 | View |
| Nov 13, 2025 | SCHEDULE 13G/A | PRIMECAP MANAGEMENT CO/CA/ | 10.2% | 14,954,697 | View |
| Apr 17, 2025 | SCHEDULE 13G/A | BlackRock, Inc. | 8.5% | 12,506,681 | View |
Percent = "% of class represented by amount beneficially owned" for this reporting person in the filed 13D/13G.
Shares = reported beneficial ownership amount for the same row (not portfolio shares from 13F).
Amendments (/A) can repeat the same holder over time, so rows should not be summed.
Extraction is best-effort from filing text and can be missing or noisy; verify exact figures via the SEC link in each row.