---
schema_version: "secwatch.filing_event.v1"
accession: "0001171843-22-006126"
form_type: "8-K"
ticker: "APTOF"
cik: "0000882361"
company_name: "Aptose Biosciences Inc."
filed_at: "2022-09-16T23:59:59+00:00"
generated_at: "2026-06-23T09:15:30.638696+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.45
calibrated_materiality_score: 0.45
confidence: "high"
source: SEC EDGAR
---

# Aptose appoints Dr. Bernd R. Seizinger to its Board of Directors, effective Sept. 13, 2022

## Summary
- Dr. Seizinger brings >25 years pharma/biotech experience, including VP roles at Bristol-Myers Squibb.
- He will receive standard non-management director compensation and a 50,000-share option grant under the 2021 plan.
- Board now has seven members; appointment effective immediately.
- Seizinger has served as CEO of GPC Biotech and holds board positions at multiple biotech firms.

## SEC filing metadata
- accession: 0001171843-22-006126
- form_type: 8-K
- ticker: APTOF
- cik: 0000882361
- company_name: Aptose Biosciences Inc.
- filed_at: 2022-09-16T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.45
- calibrated_materiality_score: 0.45
- confidence: high
- sec_items: 5.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/882361/000117184322006126/0001171843-22-006126-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/882361/000117184322006126/f8k_091622.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001171843-22-006126
- JSON: https://secwatch.observer/filing/0001171843-22-006126.json
- Plain text: https://secwatch.observer/filing/0001171843-22-006126.txt

## Key facts
- Executive change
  Dr. Bernd R. Seizinger, M.D., Ph.D. was appointed as Director at Aptose Biosciences Inc..
  - Action: appointed
  - Role: Director
  source text: On September 13, 2022, Aptose Biosciences Inc. (“we” or the “Company”) appointed Dr. Bernd R. Seizinger, M.D., Ph.D. to its Board of Directors (the “Board”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/882361/000117184322006126/0001171843-22-006126-index.htm

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