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 |
|---|---|---|---|
| 10-Q | Quarterly report | Oct 28, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Results of operations
|
Oct 28, 2026 | Oct 28, 2026 |
| 10-Q | Quarterly report | Jul 29, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Jul 29, 2026 | Jul 29, 2026 |
| 8-K |
Current report
Results of operations
|
Jul 1, 2026 | Jul 1, 2026 |
| 8-K |
Current report
Shareholder vote results
|
Jun 10, 2026 | Jun 9, 2026 |
| 8-K/A | Amended current report | Jun 10, 2026 | May 14, 2026 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, New debt, Regulation FD disclosure
|
May 14, 2026 | May 14, 2026 |
| SC TO-T/A | Filing | May 14, 2026 | — |
| SC TO-T/A | Amendment no. 2 | May 12, 2026 | — |
| SC TO-T/A | Amendment no. 1 | May 6, 2026 | — |
| 10-Q | Quarterly report | Apr 29, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
Apr 29, 2026 | Apr 29, 2026 |
| ARS | Annual report to shareholders | Apr 28, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 28, 2026 | — |
| DEF 14A | Proxy statement | Apr 28, 2026 | Jun 9, 2026 |
| SC TO-T | Filing | Apr 14, 2026 | — |
| SC TO-C | Schedule to | Apr 7, 2026 | — |
| 8-K |
Current report
Results of operations
|
Apr 6, 2026 | Apr 6, 2026 |
| SC TO-C | Schedule to | Apr 3, 2026 | — |
| SC TO-C | Filing | Mar 31, 2026 | — |
| 8-K |
Current report
Material agreement, Other events
|
Mar 31, 2026 | Mar 31, 2026 |
| SC TO-C | Schedule to | Mar 31, 2026 | — |
| 8-K |
Current report
Officer or director change
|
Mar 11, 2026 | Mar 11, 2026 |
| 8-K |
Current report
Officer or director change, Other events
|
Feb 11, 2026 | Feb 11, 2026 |
| 10-K | Annual report | Feb 6, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Feb 6, 2026 | Feb 6, 2026 |
| 8-K |
Current report
Results of operations
|
Jan 14, 2026 | Jan 13, 2026 |
| 10-Q | Quarterly report | Oct 30, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Oct 30, 2025 | Oct 30, 2025 |
| 8-K |
Current report
Results of operations
|
Oct 14, 2025 | Oct 14, 2025 |
| 8-K |
Current report
Results of operations
|
Jul 31, 2025 | Jul 31, 2025 |
| 10-Q | Quarterly report | Jul 31, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Jul 7, 2025 | Jul 7, 2025 |
| 8-K |
Current report
Shareholder vote results
|
Jun 23, 2025 | Jun 17, 2025 |
| DEFA14A | Additional proxy material | Jun 2, 2025 | — |
| 8-K |
Current report
Other events
|
May 12, 2025 | May 6, 2025 |
| 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 | — |
| 10-Q | Quarterly report | May 1, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 1, 2025 | May 1, 2025 |
| ARS | Annual report to shareholders | Apr 28, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Apr 28, 2025 | — |
| DEF 14A | Proxy statement | Apr 28, 2025 | Jun 17, 2025 |
| 10-K | Annual report | Feb 12, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 12, 2025 | Feb 12, 2025 |
| 8-K |
Current report
Officer or director change
|
Jan 15, 2025 | Jan 13, 2025 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Oct 30, 2024 | Oct 28, 2024 |
| 10-Q | Quarterly report | Oct 30, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Oct 30, 2024 | Oct 30, 2024 |
| 8-K |
Current report
Officer or director change
|
Sep 12, 2024 | Sep 11, 2024 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Aug 14, 2024 | Aug 12, 2024 |
| 10-Q | Quarterly report | Aug 1, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 1, 2024 | Aug 1, 2024 |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
Jun 25, 2024 | Jun 20, 2024 |
| S-8 | Employee stock plan registration | Jun 20, 2024 | — |
| ARS | Annual report to shareholders | Apr 26, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | Apr 26, 2024 | — |
| DEF 14A | Proxy statement | Apr 26, 2024 | Jun 20, 2024 |
| 10-Q | Quarterly report | Apr 24, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
Apr 24, 2024 | Apr 24, 2024 |
| PRE 14A | Preliminary proxy statement | Apr 12, 2024 | Jun 20, 2024 |
| 10-K | Annual report | Feb 14, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Feb 13, 2024 | Feb 13, 2024 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Dec 12, 2023 | Dec 6, 2023 |
| 8-K |
Current report
Officer or director change
|
Nov 8, 2023 | Nov 6, 2023 |
| 10-Q | Quarterly report | Nov 8, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2023 | Nov 8, 2023 |
| 8-K/A |
Amended current report
Shareholder vote results
|
Sep 28, 2023 | Jun 26, 2023 |
| 8-K |
Current report
Other events
|
Sep 26, 2023 | Sep 26, 2023 |
| 8-K |
Current report
Material agreement, New debt
|
Sep 1, 2023 | Aug 28, 2023 |
| DEFA14A | Additional proxy material | Jul 31, 2023 | — |
| 8-K |
Current report
Material agreement, Bylaw or fiscal year change
|
Jul 31, 2023 | Jul 28, 2023 |
| DEFA14A | Additional proxy material | Jul 28, 2023 | — |
| 8-K |
Current report
Other events
|
Jul 28, 2023 | Jul 28, 2023 |
| 10-Q | Quarterly report | Jul 25, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Jul 25, 2023 | Jul 25, 2023 |
| 8-K |
Current report
Shareholder vote results
|
Jun 29, 2023 | Jun 26, 2023 |
| DEFA14A | Additional proxy material | Jun 13, 2023 | — |
| DEFR14A | Filing | Jun 13, 2023 | — |
| DEFA14A | Additional proxy material | Jun 12, 2023 | — |
| 8-K |
Current report
Other events
|
May 3, 2023 | May 3, 2023 |
| DEFA14A | Additional proxy material | Apr 28, 2023 | — |
| DEF 14A | Proxy statement | Apr 28, 2023 | — |
| ARS | Annual report to shareholders | Apr 28, 2023 | Apr 27, 2023 |
| 10-Q | Quarterly report | Apr 25, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Results of operations
|
Apr 25, 2023 | Apr 25, 2023 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Apr 18, 2023 | Apr 12, 2023 |
| 8-K |
Current report
Officer or director change, Other events
|
Mar 9, 2023 | Mar 5, 2023 |
| 10-K | Annual report | Feb 15, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Results of operations
|
Feb 15, 2023 | Feb 15, 2023 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Nov 10, 2022 | Nov 10, 2022 |
| 10-Q | Quarterly report | Oct 25, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations
|
Oct 25, 2022 | Oct 25, 2022 |
| 10-Q | Quarterly report | Jul 20, 2022 | Jun 30, 2022 |
| 8-K/A |
Amended current report
Results of operations
|
Jul 20, 2022 | Jul 20, 2022 |
| 8-K |
Current report
Results of operations
|
Jul 20, 2022 | Jul 20, 2022 |
| EFFECT | Filing | Jul 12, 2022 | — |
| POS AM | Filing | Jul 6, 2022 | — |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jun 21, 2022 | Jun 15, 2022 |
| DEFA14A | Additional proxy material | Jun 7, 2022 | — |
| EFFECT | Filing | May 26, 2022 | — |
| 424B3 | Prospectus | May 26, 2022 | — |
| CORRESP | Letter to the SEC | May 24, 2022 | — |
| UPLOAD | Letter from the SEC | May 23, 2022 | — |
| S-4 | Registration for a merger or exchange | May 17, 2022 | — |
| 10-Q | Quarterly report | May 3, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations, Officer or director change
|
May 3, 2022 | May 3, 2022 |
| DEFA14A | Additional proxy material | Apr 29, 2022 | — |
| DEF 14A | Proxy statement | Apr 29, 2022 | Jun 15, 2022 |
| 10-K | Annual report | Feb 3, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 3, 2022 | Feb 3, 2022 |
| 8-K |
Current report
Officer or director change
|
Jan 31, 2022 | Jan 25, 2022 |
| 8-K |
Current report
Other events
|
Nov 19, 2021 | Nov 18, 2021 |
| 8-K |
Current report
Officer or director change
|
Nov 17, 2021 | Nov 15, 2021 |
| 10-Q | Quarterly report | Oct 20, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Results of operations
|
Oct 20, 2021 | Oct 20, 2021 |
| 10-Q | Quarterly report | Jul 22, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations
|
Jul 22, 2021 | Jul 22, 2021 |
| UPLOAD | Letter from the SEC | Jun 22, 2021 | — |
| CORRESP | Letter to the SEC | Jun 21, 2021 | — |
| UPLOAD | Letter from the SEC | Jun 17, 2021 | — |
| CORRESP | Letter to the SEC | Jun 9, 2021 | — |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
Jun 8, 2021 | Jun 2, 2021 |
| PX14A6G | Filing | May 28, 2021 | — |
| UPLOAD | Letter from the SEC | May 13, 2021 | — |
| DEFA14A | Additional proxy material | Apr 23, 2021 | — |
| DEF 14A | Proxy statement | Apr 23, 2021 | Jun 2, 2021 |
| 10-Q | Quarterly report | Apr 22, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Results of operations
|
Apr 22, 2021 | Apr 22, 2021 |
| PRE 14A | Preliminary proxy statement | Apr 9, 2021 | Jun 2, 2021 |
| DEFA14A | Additional proxy material | Apr 9, 2021 | — |
| 8-K |
Current report
Officer or director change, Other events
|
Apr 9, 2021 | Apr 7, 2021 |
| CORRESP | Letter to the SEC | Apr 7, 2021 | — |
| UPLOAD | Letter from the SEC | Mar 25, 2021 | — |
| 8-K |
Current report
Other events
|
Feb 16, 2021 | Feb 16, 2021 |
| 8-K |
Current report
Other events
|
Feb 4, 2021 | Feb 4, 2021 |
| 10-K | Annual report | Feb 3, 2021 | Dec 31, 2020 |
| 8-K |
Current report
Results of operations
|
Feb 3, 2021 | Feb 3, 2021 |
| 10-Q | Quarterly report | Oct 21, 2020 | Sep 30, 2020 |
| 8-K |
Current report
Results of operations, Other events
|
Oct 21, 2020 | Oct 21, 2020 |
| 8-K |
Current report
Officer or director change
|
Sep 21, 2020 | Sep 15, 2020 |
| 10-Q | Quarterly report | Jul 22, 2020 | Jun 30, 2020 |
| 8-K |
Current report
Results of operations
|
Jul 22, 2020 | Jul 22, 2020 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Jul 22, 2020 | Jul 16, 2020 |
| 8-K |
Current report
Other events
|
Jun 18, 2020 | Jun 18, 2020 |
| 8-K |
Current report
Shareholder vote results
|
Jun 5, 2020 | Jun 3, 2020 |
| 8-K |
Current report
Other events
|
Apr 30, 2020 | Apr 27, 2020 |
| 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 | — |
| 10-Q | Quarterly report | Apr 23, 2020 | Mar 31, 2020 |
| 8-K |
Current report
Results of operations
|
Apr 22, 2020 | Apr 22, 2020 |
| DEFA14A | Additional proxy material | Apr 20, 2020 | — |
| DEF 14A | Proxy statement | Apr 20, 2020 | Jun 3, 2020 |
| 8-K |
Current report
Officer or director change
|
Apr 20, 2020 | Apr 20, 2020 |
| 10-K | Annual report | Feb 6, 2020 | Dec 31, 2019 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Feb 3, 2020 | Jan 28, 2020 |
| 8-K |
Current report
Results of operations
|
Jan 30, 2020 | Jan 30, 2020 |
| 8-K |
Current report
Other events
|
Dec 19, 2019 | Dec 19, 2019 |
| 10-Q | Quarterly report | Oct 22, 2019 | Sep 30, 2019 |
| 8-K | Current report | Oct 22, 2019 | Oct 22, 2019 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure, Other events
|
Oct 1, 2019 | Sep 29, 2019 |
| 10-Q | Quarterly report | Jul 24, 2019 | Jun 30, 2019 |
| 8-K |
Current report
Results of operations
|
Jul 23, 2019 | Jul 23, 2019 |
| 8-K |
Current report
Shareholder vote results
|
Jun 20, 2019 | Jun 19, 2019 |
| DEFA14A | Additional proxy material | May 24, 2019 | — |
| 8-K |
Current report
Officer or director change
|
May 15, 2019 | May 9, 2019 |
| DEFA14A | Additional proxy material | Apr 30, 2019 | — |
| DEF 14A | Proxy statement | Apr 30, 2019 | Jun 19, 2019 |
| DEFA14A | Additional proxy material | Apr 29, 2019 | — |
| 8-K |
Current report
Other events
|
Apr 29, 2019 | Apr 29, 2019 |
| 10-Q | Quarterly report | Apr 24, 2019 | Mar 31, 2019 |
| 8-K |
Current report
Results of operations
|
Apr 24, 2019 | Apr 24, 2019 |
| 8-K |
Current report
Other events
|
Mar 25, 2019 | Mar 24, 2019 |
| 10-K | Annual report | Feb 6, 2019 | Dec 31, 2018 |
| 8-K |
Current report
Results of operations
|
Jan 29, 2019 | Jan 29, 2019 |
| 8-K |
Current report
Officer or director change
|
Nov 1, 2018 | Nov 1, 2018 |
| 10-Q | Quarterly report | Oct 23, 2018 | Sep 30, 2018 |
| 8-K |
Current report
Results of operations
|
Oct 23, 2018 | Oct 23, 2018 |
| 8-K |
Current report
Other events
|
Aug 3, 2018 | Aug 3, 2018 |
| 10-Q | Quarterly report | Jul 24, 2018 | Jun 30, 2018 |
| 8-K |
Current report
Results of operations
|
Jul 24, 2018 | Jul 24, 2018 |
| UPLOAD | Letter from the SEC | Jul 23, 2018 | — |
| CORRESP | Letter to the SEC | Jun 28, 2018 | — |
| 8-K |
Current report
Officer or director change
|
Jun 26, 2018 | Jun 21, 2018 |
| UPLOAD | Letter from the SEC | Jun 18, 2018 | — |
| 8-K |
Current report
Shareholder vote results
|
Jun 15, 2018 | Jun 12, 2018 |
| PX14A6G | Filing | May 3, 2018 | — |
| DEFA14A | Additional proxy material | Apr 27, 2018 | — |
| DEF 14A | Proxy statement | Apr 27, 2018 | Jun 12, 2018 |
| 10-Q | Quarterly report | Apr 24, 2018 | Mar 31, 2018 |
| 8-K |
Current report
Results of operations
|
Apr 24, 2018 | Apr 24, 2018 |
| PX14A6G | Filing | Mar 27, 2018 | — |
| 10-K | Annual report | Feb 1, 2018 | Dec 31, 2017 |
| 8-K |
Current report
Results of operations
|
Jan 25, 2018 | Jan 25, 2018 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Nov 21, 2017 | Nov 21, 2017 |
Showing 200 filings, the most recent 200. 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)
Other Biological Products, (No Diagnostic Substances) companies
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All 182 Biological Products, (No Diagnostic Substances) companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.