# BIOGEN INC. — DEFA14A

BIOGEN INC. of CAMBRIDGE, MA filed a DEFA14A with the SEC on 2025-04-28. Industry: Biological Products, (No Diagnostic Substances).

## Filing

- Filed: 2025-04-28
- Form: DEFA14A
- Accession: 0001193125-25-097749
- Registrant: BIOGEN INC.
- CIK: 0000875045
- Industry (SIC): Biological Products, (No Diagnostic Substances) (2836)
- State of incorporation: DE
- Location: CAMBRIDGE, MA

## Documents (3)

| Seq | Type | Description |
| --- | --- | --- |
| 1 | DEFA14A | DEFA14A |
| 2 | GRAPHIC | GRAPHIC |
| 3 | GRAPHIC | GRAPHIC |

## Filing timeline for this registrant (60)

_Showing 12 of 60 filings._

| Filed | Form |
| --- | --- |
| [2026-04-28](https://search.stillhousedata.com/proxy/0001193125-26-187383) | DEFA14A |
| [2026-04-28](https://search.stillhousedata.com/proxy/0001193125-26-187303) | DEF 14A |
| [2025-06-02](https://search.stillhousedata.com/proxy/0001193125-25-132885) | DEFA14A |
| 2025-04-28 | DEFA14A |
| [2025-04-28](https://search.stillhousedata.com/proxy/0001193125-25-097747) | DEF 14A |
| [2024-04-26](https://search.stillhousedata.com/proxy/0001193125-24-118335) | DEFA14A |
| [2024-04-26](https://search.stillhousedata.com/proxy/0001193125-24-118313) | DEF 14A |
| [2024-04-12](https://search.stillhousedata.com/proxy/0001193125-24-094828) | PRE 14A |
| [2023-07-31](https://search.stillhousedata.com/proxy/0001193125-23-198545) | DEFA14A |
| [2023-07-28](https://search.stillhousedata.com/proxy/0001193125-23-196809) | DEFA14A |
| [2023-06-13](https://search.stillhousedata.com/proxy/0001193125-23-165725) | DEFA14A |
| [2023-06-13](https://search.stillhousedata.com/proxy/0001193125-23-165722) | DEFR14A |

## More

- [CIK 875045 on SEC EDGAR (source of record)](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=875045&type=&dateb=&owner=include&count=40)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/proxy/0001193125-25-097749.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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