---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-119951"
form_type: "8-K"
ticker: "APTOF"
cik: "0000882361"
company_name: "Aptose Biosciences Inc."
filed_at: "2026-03-23T23:59:59+00:00"
generated_at: "2026-05-15T09:26:26.330337+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.2
calibrated_materiality_score: 0.2
confidence: "high"
source: SEC EDGAR
---

# Aptose amends CEO Rice's employment agreement; confirms no deferred compensation owed

## Summary
- First Amendment to CEO William Rice's employment agreement confirms no deferred compensation plan was ever established.
- Rice acknowledges sole responsibility for all individual taxes, penalties, and interest on benefits paid under agreement.
- Amendment clarifies that references to 'Deferred Compensation Plan' in prior agreements are disregarded.
- No change in Rice's role; continues as Chairman, President, and CEO.

## SEC filing metadata
- accession: 0001193125-26-119951
- form_type: 8-K
- ticker: APTOF
- cik: 0000882361
- company_name: Aptose Biosciences Inc.
- filed_at: 2026-03-23T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.2
- calibrated_materiality_score: 0.2
- confidence: high
- sec_items: 1.01, 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/882361/000119312526119951/0001193125-26-119951-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/882361/000119312526119951/d113888d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-119951
- JSON: https://secwatch.observer/filing/0001193125-26-119951.json
- Plain text: https://secwatch.observer/filing/0001193125-26-119951.txt

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