---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-293433"
form_type: "8-K"
ticker: "BIIB"
cik: "0000875045"
company_name: "BIOGEN INC."
filed_at: "2023-12-12T23:59:59+00:00"
generated_at: "2026-06-07T14:31:15.422620+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.25
calibrated_materiality_score: 0.25
confidence: "high"
source: SEC EDGAR
---

# Biogen amends bylaws to update stockholder notice requirements and align with SEC universal proxy rules

## Summary
- Requires disclosure of derivative/synthetic long positions from stockholders proposing business or nominations.
- Aligns director nomination procedures with Rule 14a-19, including 67% proxy solicitation representation requirement.
- Limits number of nominees a stockholder may propose to number of directors to be elected at meeting.
- Requires stockholder proxy solicitations to use non-white proxy cards; white cards reserved for Board use.
- Updates adjournment, quorum, and stockholder list provisions to conform to recent Delaware law changes.

## SEC filing metadata
- accession: 0001193125-23-293433
- form_type: 8-K
- ticker: BIIB
- cik: 0000875045
- company_name: BIOGEN INC.
- filed_at: 2023-12-12T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.25
- calibrated_materiality_score: 0.25
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/875045/000119312523293433/0001193125-23-293433-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/875045/000119312523293433/d850833d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-293433
- JSON: https://secwatch.observer/filing/0001193125-23-293433.json
- Plain text: https://secwatch.observer/filing/0001193125-23-293433.txt

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