---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-23-008939"
form_type: "8-K"
ticker: null
cik: "0001496323"
company_name: "IGM Biosciences, Inc."
filed_at: "2023-03-21T23:59:59+00:00"
generated_at: "2026-06-17T22:11:43.355325+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.2
calibrated_materiality_score: 0.2
confidence: "high"
source: SEC EDGAR
---

# IGM Biosciences amends bylaws to update proxy, stockholder meeting procedures

## Summary
- Bylaws amended effective March 16, 2023 to align with universal proxy rules and DGCL changes.
- Updated advance notice procedures for director nominations and stockholder proposals, including Rule 14a-19 compliance.
- Requires additional disclosures on related party transactions and third-party compensation for director nominees.
- Board gains explicit authority to cancel, postpone, or reschedule annual and special stockholder meetings.
- Changes conform to recent amendments to the Delaware General Corporation Law.

## SEC filing metadata
- accession: 0000950170-23-008939
- form_type: 8-K
- cik: 0001496323
- company_name: IGM Biosciences, Inc.
- filed_at: 2023-03-21T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.2
- calibrated_materiality_score: 0.2
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1496323/000095017023008939/0000950170-23-008939-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1496323/000095017023008939/igms-20230316.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-23-008939
- JSON: https://secwatch.observer/filing/0000950170-23-008939.json
- Plain text: https://secwatch.observer/filing/0000950170-23-008939.txt

## Key facts
- Governance Changes
  IGM Biosciences, Inc.: Adopted amended and restated bylaws updating advance notice procedures, board actions, and meeting procedures to reflect universal proxy rules and DGCL amendments (effective 2023-03-16).
  - Change: bylaw amendment
  - Effective: 2023-03-16
  source text: On March 16, 2023, in connection with the effectiveness of new Securities and Exchange Commission rules regarding universal proxy cards, certain recent changes to the Delaware General Corporation Law (the “DGCL”), and a periodic review of the bylaws of IGM Biosciences, Inc. (the “Company”) the Company’s board of directors (the “Board”) adopted amended and restated bylaws (the “Amended and Restated Bylaws”), effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1496323/000095017023008939/0000950170-23-008939-index.htm

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