---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-24-035016"
form_type: "8-K"
ticker: "MBIO"
cik: "0001680048"
company_name: "MUSTANG BIO, INC."
filed_at: "2024-03-15T23:59:59+00:00"
generated_at: "2026-06-04T17:26:27.769102+00:00"
event_type: "regulatory"
sentiment: "negative"
materiality_score: 0.8
calibrated_materiality_score: 0.8
confidence: "high"
source: SEC EDGAR
---

# Mustang Bio receives Nasdaq delisting notice for equity shortfall; 45 days to submit compliance plan

## Summary
- Stockholders' equity of $123,000 falls short of Nasdaq's $2.5M minimum for continued listing.
- Company has until April 29, 2024 to submit a plan to regain compliance.
- If plan is accepted, Nasdaq may grant a 180-day extension; otherwise Company can appeal.
- Trading continues on Nasdaq under MBIO with no immediate effect on listing.

## SEC filing metadata
- accession: 0001104659-24-035016
- form_type: 8-K
- ticker: MBIO
- cik: 0001680048
- company_name: MUSTANG BIO, INC.
- filed_at: 2024-03-15T23:59:59+00:00
- event_type: regulatory
- sentiment: negative
- materiality_score: 0.8
- calibrated_materiality_score: 0.8
- confidence: high
- sec_items: 3.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1680048/000110465924035016/0001104659-24-035016-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1680048/000110465924035016/tm248971d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-24-035016
- JSON: https://secwatch.observer/filing/0001104659-24-035016.json
- Plain text: https://secwatch.observer/filing/0001104659-24-035016.txt

## Key facts
- Listing & Compliance Notices
  MUSTANG BIO, INC. received a nasdaq deficiency notice notice regarding stockholders equity (rules 5550(b)(1)).
  - Exchange: nasdaq
  - Notice: deficiency notice
  - Deficiency: stockholders equity
  - Rules: 5550(b)(1)
  source text: March 13, 2024, Mustang Bio, Inc. (the “Company”) received a deficiency letter (the “Letter”) from the Listing Qualifications Department (the “Staff”) of The Nasdaq Stock Market LLC (“Nasdaq”) notifying the Company that it was not in compliance with the minimum stockholders’ equity requirement for continued listing on the Nasdaq Capital Market under Nasdaq Listing Rule 5550(b)(1). Nasdaq Listing Rule 5550(b)(1) requires companies listed on the Nasdaq Capital Market to maintain stockholders’ equity of at least $2,500,000 (the “Stockholders’ Equity Requirement”). The Company’s Annual Report on F
  evidence_url: https://www.sec.gov/Archives/edgar/data/1680048/000110465924035016/0001104659-24-035016-index.htm

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