---
schema_version: "secwatch.filing_event.v1"
accession: "0001171843-26-002877"
form_type: "8-K"
ticker: "APTOF"
cik: "0000882361"
company_name: "Aptose Biosciences Inc."
filed_at: "2026-04-30T23:59:59+00:00"
generated_at: "2026-05-15T01:24:47.757890+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Aptose delays closing of Hanmi arrangement; targets May 2026 for completion

## Summary
- Closing delayed as Korean regulatory approvals remain in progress; parties do not anticipate prevention.
- Hanmi will acquire all outstanding Aptose shares at C$2.41 per share, a 28% premium to C$1.88 VWAP.
- Transaction originally announced Nov 19, 2025; closing expected in May 2026.

## SEC filing metadata
- accession: 0001171843-26-002877
- form_type: 8-K
- ticker: APTOF
- cik: 0000882361
- company_name: Aptose Biosciences Inc.
- filed_at: 2026-04-30T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/882361/000117184326002877/0001171843-26-002877-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/882361/000117184326002877/f8k_042926.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001171843-26-002877
- JSON: https://secwatch.observer/filing/0001171843-26-002877.json
- Plain text: https://secwatch.observer/filing/0001171843-26-002877.txt

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