---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-154170"
form_type: "8-K"
ticker: "APTOF"
cik: "0000882361"
company_name: "Aptose Biosciences Inc."
filed_at: "2025-07-02T23:59:59+00:00"
generated_at: "2026-05-18T09:51:20.863136+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Aptose defers interest payment on Hanmi loan to December 31, 2025

## Summary
- Interest for Dec 21, 2024–Mar 31, 2025, originally due June 27, 2025, deferred to Dec 31, 2025.
- Interest for Mar 31–Jun 30, 2025 also deferred to Dec 31, 2025.
- Interest Deferral Agreement signed June 24, 2025 between Aptose and Hanmi.
- Aptose is a clinical-stage precision oncology company developing tuspetinib for AML.

## SEC filing metadata
- accession: 0001193125-25-154170
- form_type: 8-K
- ticker: APTOF
- cik: 0000882361
- company_name: Aptose Biosciences Inc.
- filed_at: 2025-07-02T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 2.03, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/882361/000119312525154170/0001193125-25-154170-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/882361/000119312525154170/d68389d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-154170
- JSON: https://secwatch.observer/filing/0001193125-25-154170.json
- Plain text: https://secwatch.observer/filing/0001193125-25-154170.txt

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