---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-105074"
form_type: "8-K"
ticker: "BIIB"
cik: "0000875045"
company_name: "BIOGEN INC."
filed_at: "2023-04-18T23:59:59+00:00"
generated_at: "2026-06-17T01:05:39.513889+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.05
calibrated_materiality_score: 0.05
confidence: "high"
source: SEC EDGAR
---

# Biogen amends bylaws to change 'Chairman' title to 'Chair'

## Summary
- Board approved Fourth Amended and Restated Bylaws effective April 12, 2023.
- Title change from 'Chairman' to 'Chair' adopted in corporate governance documents.
- No impact on financial position, operations, or leadership roles beyond nomenclature.

## SEC filing metadata
- accession: 0001193125-23-105074
- form_type: 8-K
- ticker: BIIB
- cik: 0000875045
- company_name: BIOGEN INC.
- filed_at: 2023-04-18T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.05
- calibrated_materiality_score: 0.05
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/875045/000119312523105074/0001193125-23-105074-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/875045/000119312523105074/d500907d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-105074
- JSON: https://secwatch.observer/filing/0001193125-23-105074.json
- Plain text: https://secwatch.observer/filing/0001193125-23-105074.txt

## Key facts
- Governance Changes
  BIOGEN INC.: Effective April 12, 2023, the Board approved amended bylaws to change the title of 'Chairman' to 'Chair' (effective 2023-04-12).
  - Change: bylaw amendment
  - Effective: 2023-04-12
  source text: Effective April 12, 2023, the Board of Directors of Biogen Inc. (the “Company”) approved the Company’s Fourth Amended and Restated Bylaws, as amended through April 12, 2023 (as so amended, the “Amended Bylaws”), to change the title of “Chairman” to “Chair.”
  evidence_url: https://www.sec.gov/Archives/edgar/data/875045/000119312523105074/0001193125-23-105074-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.