---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-124189"
form_type: "8-K"
ticker: "MBIO"
cik: "0001680048"
company_name: "MUSTANG BIO, INC."
filed_at: "2025-12-23T23:59:59+00:00"
generated_at: "2026-05-16T12:16:07.267235+00:00"
event_type: "other_material"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Mustang Bio terminates CD20 CAR-T license with Fred Hutch, pays $730K to settle $1.4M in payables

## Summary
- Terminated CD20 CAR-T license with Fred Hutch; agreed to pay $730,000 to settle ~$1.4M in outstanding payables.
- Fred Hutch to pay Mustang at least 10% of consideration from any third-party CD20 licensing within three years.
- All four proposals passed at Dec 22 annual meeting: directors elected, KPMG ratified, ESPP shares raised to 259,333, EIP to 2,514,666.

## SEC filing metadata
- accession: 0001104659-25-124189
- form_type: 8-K
- ticker: MBIO
- cik: 0001680048
- company_name: MUSTANG BIO, INC.
- filed_at: 2025-12-23T23:59:59+00:00
- event_type: other_material
- sentiment: negative
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 5.07, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1680048/000110465925124189/0001104659-25-124189-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1680048/000110465925124189/tmb-20251217x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-124189
- JSON: https://secwatch.observer/filing/0001104659-25-124189.json
- Plain text: https://secwatch.observer/filing/0001104659-25-124189.txt

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