---
schema_version: "secwatch.filing_event.v1"
accession: "0001558370-23-005369"
form_type: "8-K"
ticker: "MBIO"
cik: "0001680048"
company_name: "MUSTANG BIO, INC."
filed_at: "2023-04-03T23:59:59+00:00"
generated_at: "2026-06-17T07:04:44.943701+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Mustang Bio effects 15-for-1 reverse stock split to regain Nasdaq compliance

## Summary
- Reverse split effective April 3, 2023; shares trade split-adjusted April 4.
- Outstanding shares reduced from ~109.4M to ~7.3M; no fractional shares issued.
- Split approved by ~62.2% of voting power; Board set ratio on March 15.
- Aimed at meeting Nasdaq $1.00 minimum bid price requirement for continued listing.
- Bylaws amended to change quorum requirement to majority of outstanding voting power.

## SEC filing metadata
- accession: 0001558370-23-005369
- form_type: 8-K
- ticker: MBIO
- cik: 0001680048
- company_name: MUSTANG BIO, INC.
- filed_at: 2023-04-03T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 3.03, 5.03, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1680048/000155837023005369/0001558370-23-005369-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1680048/000155837023005369/tmb-20230328x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001558370-23-005369
- JSON: https://secwatch.observer/filing/0001558370-23-005369.json
- Plain text: https://secwatch.observer/filing/0001558370-23-005369.txt

## Key facts
- Governance Changes
  MUSTANG BIO, INC.: Filed Certificate of Amendment to effect a 15-for-1 reverse stock split of common stock (effective 2023-04-03).
  - Change: charter amendment
  - Effective: 2023-04-03
  source text: On April 3, 2023, Mustang Bio, Inc. (the “ Company ”) filed a Certificate of Amendment (the “ Amendment ”) to its Amended and Restated Certificate of Incorporation, as amended, with the Secretary of State of the State of Delaware to effect a 15-for-1 reverse stock split (the “ Reverse Stock Split ”) of the Company’s shares of common stock, $0.0001 par value (the “ Common Stock ”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1680048/000155837023005369/0001558370-23-005369-index.htm
- Governance Changes
  MUSTANG BIO, INC.: Amended bylaws to change the quorum requirement for stockholder meetings from a majority of outstanding shares to a majority of outstanding voting power (effective 2023-03-28).
  - Change: bylaw amendment
  - Effective: 2023-03-28
  source text: on March 28, 2023, the Board adopted the Amended and Restated Bylaws of the Company (the “ Amended Bylaws ”), effective immediately. The Amended Bylaws modify the Company’s prior bylaws to amend Article II, Section 6 to change the quorum requirement for meetings of stockholders to a majority of the outstanding voting power of the Company, calculated in accordance with the Company’s Amended and Restated Certificate of Incorporation, from a majority of the outstanding shares of stock of the Company issued and outstanding and entitled to vote thereat.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1680048/000155837023005369/0001558370-23-005369-index.htm

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