---
schema_version: "secwatch.filing_event.v1"
accession: "0001171843-25-001910"
form_type: "8-K"
ticker: "APTOF"
cik: "0000882361"
company_name: "Aptose Biosciences Inc."
filed_at: "2025-04-01T23:59:59+00:00"
generated_at: "2026-05-24T01:19:16.421912+00:00"
event_type: "regulatory"
sentiment: "negative"
materiality_score: 0.9
calibrated_materiality_score: 0.9
confidence: "high"
source: SEC EDGAR
---

# Aptose (APTO) to delist from Nasdaq April 2 for equity non-compliance

## Summary
- Nasdaq determined to delist Aptose common shares effective April 2, 2025 for failure to meet equity requirement (Listing Rule 5550(b)(1)).
- Company confirmed on March 31, 2025 it could not regain compliance by the Panel's final extended deadline.
- Trading suspended at open on April 2; shares continue trading on TSX under symbol APS.
- Board reviewing options, including possible appeal; company seeks to relist on a U.S. exchange at appropriate time.

## SEC filing metadata
- accession: 0001171843-25-001910
- form_type: 8-K
- ticker: APTOF
- cik: 0000882361
- company_name: Aptose Biosciences Inc.
- filed_at: 2025-04-01T23:59:59+00:00
- event_type: regulatory
- sentiment: negative
- materiality_score: 0.9
- calibrated_materiality_score: 0.9
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/882361/000117184325001910/0001171843-25-001910-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/882361/000117184325001910/f8k_040125.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001171843-25-001910
- JSON: https://secwatch.observer/filing/0001171843-25-001910.json
- Plain text: https://secwatch.observer/filing/0001171843-25-001910.txt

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