---
schema_version: "secwatch.filing_event.v1"
accession: "0001558370-24-008535"
form_type: "8-K"
ticker: "MBIO"
cik: "0001680048"
company_name: "MUSTANG BIO, INC."
filed_at: "2024-05-21T23:59:59+00:00"
generated_at: "2026-06-01T11:08:49.444576+00:00"
event_type: "regulatory"
sentiment: "negative"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Mustang Bio receives second Nasdaq deficiency notice; stock bid below $1 for 31 days

## Summary
- Nasdaq notified Mustang Bio on May 16, 2024 that bid price closed below $1 for 31 consecutive business days.
- Company has 180 days, until November 12, 2024, to regain compliance by closing at $1.00 or more for 10+ days.
- Prior stockholders' equity deficiency: Nasdaq granted extension through September 9, 2024 to regain compliance.
- If not cured, Mustang may seek a second grace period or request a hearing to avoid delisting.
- No decision yet on reverse stock split or other remedy; delisting risk remains if compliance is not achieved.

## SEC filing metadata
- accession: 0001558370-24-008535
- form_type: 8-K
- ticker: MBIO
- cik: 0001680048
- company_name: MUSTANG BIO, INC.
- filed_at: 2024-05-21T23:59:59+00:00
- event_type: regulatory
- sentiment: negative
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 3.01, 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1680048/000155837024008535/0001558370-24-008535-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1680048/000155837024008535/tmb-20240516x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001558370-24-008535
- JSON: https://secwatch.observer/filing/0001558370-24-008535.json
- Plain text: https://secwatch.observer/filing/0001558370-24-008535.txt

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