---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-044890"
form_type: "8-K"
ticker: "MBIO"
cik: "0001680048"
company_name: "MUSTANG BIO, INC."
filed_at: "2026-04-17T23:59:59+00:00"
generated_at: "2026-05-15T05:32:03.938432+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 deficiency notice for bid price below $1.00

## Summary
- Received Nasdaq notice on April 15, 2026 for non-compliance with minimum bid price rule after 30 consecutive business days below $1.00.
- Has 180-calendar day grace period until October 12, 2026 to regain compliance by closing at $1.00+ for 10 consecutive business days.
- May qualify for second 180-day period if meets Nasdaq continued listing criteria and provides written notice of intent to cure.
- Could face delisting if unable to regain compliance; no decision yet on specific actions to remedy deficiency.

## SEC filing metadata
- accession: 0001104659-26-044890
- form_type: 8-K
- ticker: MBIO
- cik: 0001680048
- company_name: MUSTANG BIO, INC.
- filed_at: 2026-04-17T23:59:59+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/1680048/000110465926044890/0001104659-26-044890-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1680048/000110465926044890/tm2612037d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-044890
- JSON: https://secwatch.observer/filing/0001104659-26-044890.json
- Plain text: https://secwatch.observer/filing/0001104659-26-044890.txt

## Source-grounded claims
- claim_id: 62afdf812a2291b63792d5b7f01a3a3c22bb792c
  claim: MUSTANG BIO, INC. received a nasdaq deficiency notice notice regarding minimum bid price (rules 5550(a)(2), 5810(c)(3)(A)).
  evidence_excerpt: April 15, 2026, Mustang Bio, Inc. (the “Company”) received a notice from the Listing Qualifications Department (the “Staff”) of The Nasdaq Stock Market LLC (“Nasdaq”) indicating that the bid price of the Company’s common stock, par value $0.0001 per share (“Common Stock”), had closed below $1.00 per share for 30 consecutive business days and, as a result, the Company is not in compliance with Nasdaq Listing Rule 5550(a)(2), which sets forth the minimum bid price requirement for continued listing on the Nasdaq Capital Market. The Staff notice has no immediate effect on the listing of the Compan
  evidence_url: https://www.sec.gov/Archives/edgar/data/1680048/000110465926044890/0001104659-26-044890-index.htm

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