secwatch.observer — SEC 8-K summary ====================================== Issuer: Aptose Biosciences Inc. (APTOF) CIK: 0000882361 Form: 8-K Filed at: 2025-08-27T23:59:59+00:00 Accession: 0001193125-25-189846 Event type: other_material Sentiment: neutral Materiality: 0.50 Item codes: 4.01, 9.01 LLM model: deepseek-v4-flash:cloud@v2 Aptose Biosciences appoints EY as independent auditor, replacing KPMG --------------------------------------------------------------------- - KPMG informed company it would not stand for re-appointment for 2025 annual audit. - Board approved EY as independent auditor; shareholders voted approval at reconvened meeting on August 22, 2025. - No disagreements or reportable events between company and KPMG during past two fiscal years. - KPMG letter agreeing with disclosures attached as Exhibit 16.1. Source: EDGAR index: https://www.sec.gov/Archives/edgar/data/882361/000119312525189846/0001193125-25-189846-index.htm Primary doc: https://www.sec.gov/Archives/edgar/data/882361/000119312525189846/d96555d8k.htm HTML page: https://secwatch.observer/filing/0001193125-25-189846 License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer