---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-180763"
form_type: "8-K"
ticker: null
cik: "0001496323"
company_name: "IGM Biosciences, Inc."
filed_at: "2025-08-14T23:59:59+00:00"
generated_at: "2026-05-17T13:06:47.733233+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.85
calibrated_materiality_score: 0.85
confidence: "high"
source: SEC EDGAR
---

# IGM Biosciences acquired by Concentra Biosciences; delisted from Nasdaq

## Summary
- Tender offer closed August 13, 2025; 77.53% of shares tendered, all conditions satisfied.
- Each share exchanged for $1.247 cash plus one contingent value right (CVR).
- Board resigned; Kevin Tang named sole director of surviving corporation.
- Trading of IGMS common stock suspended; delisting and deregistration initiated.

## SEC filing metadata
- accession: 0001193125-25-180763
- form_type: 8-K
- cik: 0001496323
- company_name: IGM Biosciences, Inc.
- filed_at: 2025-08-14T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.85
- calibrated_materiality_score: 0.85
- confidence: high
- sec_items: 2.01, 3.01, 3.03, 5.01, 5.02, 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1496323/000119312525180763/0001193125-25-180763-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1496323/000119312525180763/d82965d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-180763
- JSON: https://secwatch.observer/filing/0001193125-25-180763.json
- Plain text: https://secwatch.observer/filing/0001193125-25-180763.txt

## Key facts
- Governance Changes
  IGM Biosciences, Inc.: Certificate of incorporation amended and restated in its entirety.
  - Change: charter amendment
  source text: the Company’s certificate of incorporation and bylaws were amended and restated in their entirety
  evidence_url: https://www.sec.gov/Archives/edgar/data/1496323/000119312525180763/0001193125-25-180763-index.htm
- Governance Changes
  IGM Biosciences, Inc.: Bylaws amended and restated in their entirety.
  - Change: bylaw amendment
  source text: the Company’s certificate of incorporation and bylaws were amended and restated in their entirety
  evidence_url: https://www.sec.gov/Archives/edgar/data/1496323/000119312525180763/0001193125-25-180763-index.htm
- M&A Transactions
  IGM Biosciences, Inc. underwent a change of control involving Concentra Biosciences, LLC for $1.247 in cash per Share plus one non-transferable contractual contingent value right per Share (closed 2025-08-14).
  - Action: change of control
  - Counterparty: Concentra Biosciences, LLC
  - Consideration: $1.247 in cash per Share plus one non-transferable contractual contingent value right per Share
  - Closing: 2025-08-14
  source text: Parent completed a tender offer to purchase all of the Company’s outstanding shares of common stock, par value $0.01 per share (the “Common Stock” and shares of Common Stock, “Shares”), in exchange for (i) $1.247 in cash per Share (the “Cash Amount”); plus (ii) one non-transferable contractual contingent value right per Share
  evidence_url: https://www.sec.gov/Archives/edgar/data/1496323/000119312525180763/0001193125-25-180763-index.htm

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