Biogen SEC Filings
NASDAQ: BIIBHealth CareBiotechnology: Biological Products (No Diagnostic Substances)USD
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At close: Oct 9, 4:00 PM ET · Delayed 15 min
Biogen filing overview
This page lists 60 recent SEC filings by Biogen (BIIB), including 36 4, 11 8-K, 4 SCHEDULE 13G/A, 2 10-Q. The latest annual report (10-K) was filed on Feb 6, 2026 for the period ending Dec 31, 2025. The most recent quarterly report (10-Q) was filed on Jul 29, 2026.
The latest current report (8-K), used to disclose material events such as earnings releases and executive changes, was filed on Jul 29, 2026. Form 10-K is the audited annual report, 10-Q the quarterly report, 8-K covers material events, and Form 4 reports insider transactions. All documents link directly to SEC EDGAR.
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BIIB SEC filings
| Filed | Form | Description | Document |
|---|---|---|---|
| Oct 5, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Sep 3, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 6, 2026 | SCHEDULE 13G/A | Beneficial ownership report (passive) (amendment) | View on EDGAR |
| Aug 5, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jul 29, 2026 | 8-K | Results of Operations and Financial Condition | View on EDGAR |
| Jul 29, 2026 | 10-Q | Quarterly report | View on EDGAR |
| Jul 1, 2026 | 8-K | Results of Operations and Financial Condition | View on EDGAR |
| Jun 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jun 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jun 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jun 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jun 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jun 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jun 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jun 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jun 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jun 10, 2026 | 8-K/A | CURRENT REPORT | View on EDGAR |
| Jun 10, 2026 | 8-K | Submission of Matters to a Vote of Security Holders | View on EDGAR |
| Jun 5, 2026 | SCHEDULE 13G/A | Beneficial ownership report (passive) (amendment) | View on EDGAR |
| May 14, 2026 | SCHEDULE 13D/A | Beneficial ownership report (activist) (amendment) | View on EDGAR |
| May 14, 2026 | 8-K | Entry into a Material Definitive Agreement; Completion of Acquisition or Disposition of Assets; Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement; Regulation FD Disclosure | View on EDGAR |
| May 6, 2026 | SCHEDULE 13G/A | Beneficial ownership report (passive) (amendment) | View on EDGAR |
| May 5, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Apr 29, 2026 | 8-K | Results of Operations and Financial Condition | View on EDGAR |
| Apr 29, 2026 | 10-Q | Quarterly report | View on EDGAR |
| Apr 29, 2026 | SCHEDULE 13G | Beneficial ownership report (passive) | View on EDGAR |
| Apr 28, 2026 | DEF 14A | Definitive proxy statement | View on EDGAR |
| Apr 6, 2026 | 8-K | Results of Operations and Financial Condition | View on EDGAR |
| Apr 6, 2026 | SCHEDULE 13D | Beneficial ownership report (activist) | View on EDGAR |
| Apr 3, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 31, 2026 | 8-K | Entry into a Material Definitive Agreement; Other Events | View on EDGAR |
| Mar 26, 2026 | SCHEDULE 13G/A | Beneficial ownership report (passive) (amendment) | View on EDGAR |
| Mar 11, 2026 | 8-K | Departure or Appointment of Directors or Officers; Compensatory Arrangements | View on EDGAR |
| Feb 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 11, 2026 | 8-K | Departure or Appointment of Directors or Officers; Compensatory Arrangements; Other Events | View on EDGAR |
| Feb 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 10, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 6, 2026 | 8-K | Results of Operations and Financial Condition | View on EDGAR |
| Feb 6, 2026 | 10-K | Annual report | View on EDGAR |
| Feb 5, 2026 | SCHEDULE 13G | Beneficial ownership report (passive) | View on EDGAR |
| Feb 3, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jan 14, 2026 | 8-K | Results of Operations and Financial Condition | View on EDGAR |
| Dec 3, 2025 | 4 | Statement of changes in beneficial ownership | View on EDGAR |