---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-24-056459"
form_type: "8-K"
ticker: "MBIO"
cik: "0001680048"
company_name: "MUSTANG BIO, INC."
filed_at: "2024-05-02T23:59:59+00:00"
generated_at: "2026-06-03T00:37:19.793261+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Mustang Bio closes $4M public offering of shares and warrants; amends existing warrants

## Summary
- Gross proceeds of $4M from offering of shares and warrants at $0.237 per combined unit.
- Net proceeds ~$3.3M; potential additional $12M if all series A-1, A-2, A-3 warrants cash-exercised.
- Amended 2,588,236 existing warrants from $1.58 to $0.237 exercise price effective May 2.
- Offering includes 16.9M shares and three series of warrants each for 16.9M shares.
- H.C. Wainwright acted as placement agent; proceeds for working capital.

## SEC filing metadata
- accession: 0001104659-24-056459
- form_type: 8-K
- ticker: MBIO
- cik: 0001680048
- company_name: MUSTANG BIO, INC.
- filed_at: 2024-05-02T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 1.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1680048/000110465924056459/0001104659-24-056459-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1680048/000110465924056459/tm2413360d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-24-056459
- JSON: https://secwatch.observer/filing/0001104659-24-056459.json
- Plain text: https://secwatch.observer/filing/0001104659-24-056459.txt

## Key facts
- Material Agreements
  MUSTANG BIO, INC. amended Warrant Amendment Agreement with the Investor (effective 2024-04-29).
  - Action: amendment
  - Counterparty: the Investor
  - Effective: 2024-04-29
  source text: onnection with the Offering, the Company also entered into a warrant amendment agreement (the “Warrant Amendment Agreement”) with the Investor.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1680048/000110465924056459/0001104659-24-056459-index.htm
- Material Agreements
  MUSTANG BIO, INC. entered into Purchase Agreement with a certain institutional investor (effective 2024-04-29).
  - Action: entry
  - Agreement: equity purchase
  - Counterparty: a certain institutional investor
  - Effective: 2024-04-29
  source text: the Company entered into a securities purchase agreement (the “Purchase Agreement”) with a certain institutional investor (the “Investor”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1680048/000110465924056459/0001104659-24-056459-index.htm

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