Biogen Inc.SEC Filings
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All SEC filings by Biogen Inc. (BIIB) — annual and quarterly reports, current reports, registrations, proxies and ownership forms, updated in real time.
Financials
| 10-Q | Quarterly report | View Diff | Jul 29, 2026 | |
| 10-Q | Quarterly report | View Diff | Apr 29, 2026 | |
| ARS | Annual report to shareholders | Apr 28, 2026 | ||
| 10-K | Annual report | View Diff | Feb 6, 2026 | |
| 10-Q | Quarterly report | View Diff | Oct 30, 2025 | |
| 10-Q | Quarterly report | View Diff | Jul 31, 2025 | |
| 10-Q | Quarterly report | View Diff | May 1, 2025 | |
| ARS | Annual report to shareholders | Apr 25, 2025 | ||
| 10-K | Annual report | View Diff | Feb 12, 2025 | |
| 10-Q | Quarterly report | View Diff | Oct 30, 2024 |
Events
| 8-K | Biogen Reports Strong Second Quarter 2026 Results Demonstrating Progress Toward Its Goal of Sustainable Revenue Growth | Jul 29, 2026 | ||
| 8-K | Current report | Jul 1, 2026 | ||
| 8-K | Current report | Jun 10, 2026 | ||
| 8-K/A | Current report | Jun 10, 2026 | ||
| 8-K | Biogen Completes Acquisition of Apellis Pharmaceuticals | May 14, 2026 | ||
| 8-K | Biogen Reports Strong First Quarter 2026 Results | Apr 29, 2026 | ||
| 8-K | Results of Operations and Financial Condition | Apr 6, 2026 | ||
| 8-K | Tender and Support Agreement | Mar 31, 2026 | ||
| 8-K | Departure of Directors or Certain Officers | Mar 11, 2026 | ||
| 8-K | Departure of Directors or Certain Officers | Feb 11, 2026 |
Registrations and Prospectuses
| SC TO-T/A | Third party tender offer statement | May 14, 2026 | ||
| SC TO-T/A | Third party tender offer statement | May 12, 2026 | ||
| SC TO-T/A | Third party tender offer statement | May 6, 2026 | ||
| SC TO-T | Third party tender offer statement | Apr 14, 2026 | ||
| SC TO-C | Information about tender offer | Apr 7, 2026 | ||
| SC TO-C | Information about tender offer | Apr 3, 2026 | ||
| SC TO-C | Information about tender offer | Mar 31, 2026 | ||
| SC TO-C | Information about tender offer | Mar 31, 2026 | ||
| 424B2 | Prospectus for primary offering | May 8, 2025 | ||
| FWP | Free writing prospectus | May 6, 2025 |
Proxies
| DEFA14A | Additional proxy soliciting materials | Apr 28, 2026 | ||
| DEF 14A | Definitive proxy | View Diff | Apr 28, 2026 | |
| DEFA14A | Additional proxy soliciting materials | Jun 2, 2025 | ||
| DEFA14A | Additional proxy soliciting materials | Apr 25, 2025 | ||
| DEF 14A | Definitive proxy | View Diff | Apr 25, 2025 | |
| DEFA14A | Additional proxy soliciting materials | Apr 26, 2024 | ||
| DEF 14A | Definitive proxy | View Diff | Apr 26, 2024 | |
| PRE 14A | Preliminary proxy | Apr 12, 2024 | ||
| DEFA14A | Additional proxy soliciting materials | Jul 31, 2023 | ||
| DEFA14A | Additional proxy soliciting materials | Jul 28, 2023 |
Other
| EFFECT | Notice of effectiveness | Jul 13, 2022 | ||
| EFFECT | Notice of effectiveness | May 27, 2022 | ||
| CORRESP | Correspondence with SEC | May 24, 2022 | ||
| UPLOAD | Letter from SEC | May 23, 2022 | ||
| UPLOAD | Letter from SEC | Jun 22, 2021 | ||
| CORRESP | Correspondence with SEC | Jun 21, 2021 | ||
| UPLOAD | Letter from SEC | Jun 17, 2021 | ||
| CORRESP | Correspondence with SEC | Jun 9, 2021 | ||
| UPLOAD | Letter from SEC | May 13, 2021 | ||
| CORRESP | Correspondence with SEC | Apr 7, 2021 |
Ownership
| 4 | Parini Michael | Sep 3, 2026 | ||
| 3 | Parini Michael | Aug 12, 2026 | ||
| SC 13G/A | Beneficial ownership report | Aug 6, 2026 | ||
| 4 | Minor Lloyd | Aug 5, 2026 | ||
| 144 | Notice of proposed sale of securities | Aug 4, 2026 | ||
| 144 | Notice of proposed sale of securities | Aug 3, 2026 | ||
| 4 | Hawkins William A | Jun 11, 2026 | ||
| 4 | Sherwin Stephen A | Jun 11, 2026 | ||
| 4 | Rowinsky Eric K | Jun 11, 2026 | ||
| 4 | Mantas Jesus B | Jun 11, 2026 |