BIIB - Company ID 0000875045
BIOGEN INC. has filed 2,690 public company documents 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.
| Type | Filing | Filed | Period covered | Open |
|---|---|---|---|---|
| 4 | Insider trade | 5mo ago2026-02-03 | 2026-01-30 | View filing |
| 144 | Insider sale notice | 5mo ago2026-02-02 | - | View filing |
| 8-K | Major company event | 5mo ago2026-01-14 | 2026-01-13 | View filing |
| 4 | Insider trade | 7mo ago2025-12-03 | 2025-12-01 | View filing |
| SCHEDULE 13G/A | SCHEDULE 13G/A | 7mo ago2025-11-13 | - | View filing |
| SCHEDULE 13G | SCHEDULE 13G | 8mo ago2025-11-10 | - | View filing |
| 4 | Insider trade | 8mo ago2025-11-04 | 2025-10-31 | View filing |
| 10-Q | Quarterly report | 8mo ago2025-10-30 | 2025-09-30 | View filing |
| 8-K | Major company event | 8mo ago2025-10-30 | 2025-10-30 | View filing |
| 8-K | Major company event | 8mo ago2025-10-14 | 2025-10-14 | View filing |
| 4 | Insider trade | 9mo ago2025-10-06 | 2025-10-02 | View filing |
| 144 | Insider sale notice | 10mo ago2025-09-02 | - | View filing |
| 4 | Insider trade | 10mo ago2025-09-02 | 2025-08-29 | View filing |
| 8-K | Major company event | 11mo ago2025-07-31 | 2025-07-31 | View filing |
| 10-Q | Quarterly report | 11mo ago2025-07-31 | 2025-06-30 | View filing |
| SCHEDULE 13D/A | SCHEDULE 13D/A | 11mo ago2025-07-30 | - | View filing |
| SCHEDULE 13D/A | SCHEDULE 13D/A | 11mo ago2025-07-21 | - | View filing |
| 4 | Insider trade | 11mo ago2025-07-16 | 2025-07-08 | View filing |
| 144 | Insider sale notice | 1y ago2025-07-08 | - | View filing |
| 8-K | Major company event | 1y ago2025-07-07 | 2025-07-07 | View filing |
| 8-K | Major company event | 1y ago2025-06-23 | 2025-06-17 | View filing |
| 4 | Insider trade | 1y ago2025-06-18 | 2025-06-17 | View filing |
| 4 | Insider trade | 1y ago2025-06-18 | 2025-06-17 | View filing |
| 4 | Insider trade | 1y ago2025-06-18 | 2025-06-17 | View filing |
| 4 | Insider trade | 1y ago2025-06-18 | 2025-06-17 | View filing |
| 4 | Insider trade | 1y ago2025-06-18 | 2025-06-17 | View filing |
| 4 | Insider trade | 1y ago2025-06-18 | 2025-06-17 | View filing |
| 4 | Insider trade | 1y ago2025-06-18 | 2025-06-17 | View filing |
| 4 | Insider trade | 1y ago2025-06-18 | 2025-06-17 | View filing |
| 4 | Insider trade | 1y ago2025-06-18 | 2025-06-17 | View filing |
| 4 | Insider trade | 1y ago2025-06-18 | 2025-06-17 | View filing |
| DEFA14A | Proxy materials | 1y ago2025-06-02 | - | View filing |
| 4 | Insider trade | 1y ago2025-05-20 | 2025-05-19 | View filing |
| 144 | Insider sale notice | 1y ago2025-05-19 | - | View filing |
| 8-K | Major company event | 1y ago2025-05-12 | 2025-05-06 | View filing |
| 424B2 | Prospectus supplement | 1y ago2025-05-08 | - | View filing |
| FWP | Free writing prospectus | 1y ago2025-05-06 | - | View filing |
| 424B2 | Prospectus supplement | 1y ago2025-05-06 | - | View filing |
| 4 | Insider trade | 1y ago2025-05-05 | 2025-05-01 | View filing |
| 4 | Insider trade | 1y ago2025-05-05 | 2025-05-02 | View filing |
| S-3ASR | S-3ASR | 1y ago2025-05-01 | - | View filing |
| 10-Q | Quarterly report | 1y ago2025-05-01 | 2025-03-31 | View filing |
| 8-K | Major company event | 1y ago2025-05-01 | 2025-05-01 | View filing |
| ARS | Annual report to shareholders | 1y ago2025-04-28 | 2024-12-31 | View filing |
| DEFA14A | Proxy materials | 1y ago2025-04-28 | - | View filing |
| DEF 14A | Proxy statement | 1y ago2025-04-28 | 2025-06-17 | View filing |
| SCHEDULE 13G/A | SCHEDULE 13G/A | 1y ago2025-04-17 | - | View filing |
| 4 | Insider trade | 1y ago2025-04-03 | 2025-04-01 | View filing |
| 4 | Insider trade | 1y ago2025-03-10 | 2025-03-07 | View filing |
| 3 | New insider ownership | 1y ago2025-03-10 | 2025-03-01 | View filing |