---
schema_version: "secwatch.filing_event.v1"
accession: "0001171843-25-003505"
form_type: "8-K"
ticker: "APTOF"
cik: "0000882361"
company_name: "Aptose Biosciences Inc."
filed_at: "2025-05-28T23:59:59+00:00"
generated_at: "2026-05-20T09:46:44.086630+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Aptose shareholders approve reverse stock split and stock plan amendment; meeting adjourned for auditor search

## Summary
- All 7 director nominees re-elected with ≥97.69% votes for.
- Shareholders approved amendment to 2021 stock plan increasing reserved shares by 458,126.
- Reverse stock split authorized (1:2 to 1:20) at board discretion; ratio and date TBD.
- Meeting adjourned to allow search for successor auditor to KPMG LLP; new meeting date to be set.

## SEC filing metadata
- accession: 0001171843-25-003505
- form_type: 8-K
- ticker: APTOF
- cik: 0000882361
- company_name: Aptose Biosciences Inc.
- filed_at: 2025-05-28T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.07, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/882361/000117184325003505/0001171843-25-003505-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/882361/000117184325003505/f8k_052825.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001171843-25-003505
- JSON: https://secwatch.observer/filing/0001171843-25-003505.json
- Plain text: https://secwatch.observer/filing/0001171843-25-003505.txt

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