Biogen Inc. SEC filings BIIB
Biogen Inc. has 1,001 filings in SEC EDGAR's recent list, going back to Oct 2, 2014. Its latest annual report, Form ARS, was filed on Apr 28, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Oct 28, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Oct 28, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 424B2 | Prospectus | May 8, 2025 | — |
| FWP | Free writing prospectus | May 6, 2025 | — |
| 424B2 | Prospectus | May 6, 2025 | — |
| S-3ASR | Automatic shelf registration | May 1, 2025 | — |
| S-8 | Employee stock plan registration | Jun 20, 2024 | — |
| POS AM | Filing | Jul 6, 2022 | — |
| 424B3 | Prospectus | May 26, 2022 | — |
| S-4 | Registration for a merger or exchange | May 17, 2022 | — |
| 424B2 | Prospectus | Apr 28, 2020 | — |
| FWP | Free writing prospectus | Apr 28, 2020 | — |
| 424B2 | Prospectus | Apr 27, 2020 | — |
| S-3ASR | Automatic shelf registration | Apr 24, 2020 | — |
| S-8 | Employee stock plan registration | Jun 16, 2017 | — |
| 424B2 | Prospectus | Sep 11, 2015 | — |
| FWP | Free writing prospectus | Sep 11, 2015 | — |
| 424B2 | Prospectus | Sep 10, 2015 | — |
| S-3ASR | Automatic shelf registration | Sep 8, 2015 | — |
| S-8 | Employee stock plan registration | Jun 26, 2015 | — |
Showing 18 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Biological Products, (No Diagnostic Substances) (SIC 2836)
- Listed as
- BIIB (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Cambridge, MA
- SEC filer status
- Large accelerated filer
- SEC CIK
- 875045
- Former names
- BIOGEN IDEC INC. (until Mar 20, 2015); BIOGEN IDEC INC (until Apr 25, 2007); IDEC PHARMACEUTICALS CORP / DE (until Nov 12, 2003); IDEC PHARMACEUTICALS CORP / CA (until Feb 14, 1997)
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All 182 Biological Products, (No Diagnostic Substances) companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.