BIIB - CIK 0000875045
BIOGEN INC. has filed 2,690 documents with the SEC between 1996 and 2026. The most frequent type is insider trade (1,544 filings), alongside the regular cadence of annual reports, quarterly reports, and event disclosures every public company must make. Use the filters to focus on one filing type, or flip the sort to trace the company's history from its earliest paperwork.
Data parsed from SEC EDGAR XBRL filings. See the full market cap rankings.
| Filing | Type | Filed | Period covered |
|---|---|---|---|
| Insider sale notice | 144 | 2024-02-02 | - |
| Insider trade | 4 | 2024-01-31 | 2024-01-29 |
| Insider trade | 4 | 2024-01-31 | 2024-01-29 |
| Insider trade | 4 | 2024-01-31 | 2024-01-29 |
| Insider trade | 4 | 2024-01-31 | 2024-01-29 |
| Insider trade | 4 | 2024-01-31 | 2024-01-29 |
| Insider trade | 4 | 2024-01-31 | 2024-01-29 |
| Insider trade | 4 | 2024-01-31 | 2024-01-29 |
| Passive ownership stake (update) | SC 13G/A | 2024-01-24 | - |
| New insider ownership | 3 | 2024-01-09 | 2024-01-01 |
| Major company event | 8-K | 2023-12-12 | 2023-12-06 |
| Insider trade | 4 | 2023-12-12 | 2023-12-08 |
| Insider trade | 4 | 2023-12-12 | 2023-12-08 |
| Insider sale notice | 144 | 2023-12-11 | - |
| Major company event | 8-K | 2023-11-08 | 2023-11-06 |
| Quarterly report | 10-Q | 2023-11-08 | 2023-09-30 |
| Major company event | 8-K | 2023-11-08 | 2023-11-08 |
| Insider trade | 4 | 2023-11-03 | 2023-11-01 |
| New insider ownership | 3 | 2023-10-12 | 2023-10-02 |
| Major company event (amended) | 8-K/A | 2023-09-28 | 2023-06-26 |
| Activist ownership stake (update) | SC 13D/A | 2023-09-28 | - |
| Insider trade | 4 | 2023-09-28 | 2023-09-26 |
| Major company event | 8-K | 2023-09-26 | 2023-09-26 |
| Insider trade | 4 | 2023-09-06 | 2023-09-01 |
| Insider trade | 4 | 2023-09-06 | 2023-09-01 |
| Insider sale notice | 144 | 2023-09-05 | - |
| Major company event | 8-K | 2023-09-01 | 2023-08-28 |
| Activist ownership stake | SC 13D | 2023-08-07 | - |
| New insider ownership | 3 | 2023-08-07 | 2023-07-28 |
| Proxy materials | DEFA14A | 2023-07-31 | - |
| Major company event | 8-K | 2023-07-31 | 2023-07-28 |
| Proxy materials | DEFA14A | 2023-07-28 | - |
| Major company event | 8-K | 2023-07-28 | 2023-07-28 |
| Quarterly report | 10-Q | 2023-07-25 | 2023-06-30 |
| Major company event | 8-K | 2023-07-25 | 2023-07-25 |
| Insider trade | 4 | 2023-07-05 | 2023-06-30 |
| Insider trade | 4 | 2023-07-05 | 2023-06-30 |
| Insider trade | 4 | 2023-07-05 | 2023-06-30 |
| Insider sale notice | 144 | 2023-07-03 | - |
| Major company event | 8-K | 2023-06-29 | 2023-06-26 |
| Insider trade | 4 | 2023-06-28 | 2023-06-26 |
| Insider trade | 4 | 2023-06-28 | 2023-06-26 |
| Insider trade | 4 | 2023-06-28 | 2023-06-26 |
| Insider trade | 4 | 2023-06-28 | 2023-06-26 |
| New insider ownership | 3 | 2023-06-28 | 2023-06-26 |
| Insider trade | 4 | 2023-06-28 | 2023-06-26 |
| Insider trade | 4 | 2023-06-28 | 2023-06-26 |
| Insider trade | 4 | 2023-06-28 | 2023-06-26 |
| Proxy materials | DEFA14A | 2023-06-13 | - |
| DEFR14A | - | 2023-06-13 | - |