{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-25-189846","form_type":"8-K","ticker":"APTOF","cik":"0000882361","company_name":"Aptose Biosciences Inc.","filed_at":"2025-08-27T23:59:59+00:00","discovered_at":"2026-05-14T18:02:46.569557+00:00","generated_at":"2026-05-17T09:52:14.569705+00:00","sec_items":["4.01","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.5,"calibrated_materiality_score":0.5,"confidence":"high","headline":"Aptose Biosciences appoints EY as independent auditor, replacing KPMG","bullets":["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."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-25-189846","json":"https://secwatch.observer/filing/0001193125-25-189846.json","markdown":"https://secwatch.observer/filing/0001193125-25-189846.md","text":"https://secwatch.observer/filing/0001193125-25-189846.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/882361/000119312525189846/0001193125-25-189846-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/882361/000119312525189846/d96555d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-17T09:52:14.569705+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"9362e1beba79dd9b99c7b65c41497fe43c2a68a5","claim":"Aptose Biosciences Inc. engaged Ernst & Young LLP as its auditor.","evidence_excerpt":"on August 1, 2025 the Company announced that the Board of Directors (the “Board”) unanimously approved the selection of Ernst & Young LLP (“EY”) as the Company’s independent registered public accounting firm to serve as the Company’s independent auditor.","evidence_source":"SEC 8-K Item 4.01/4.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/882361/000119312525189846/0001193125-25-189846-index.htm","confidence":0.9,"family_label":"Auditor Changes","details":[{"label":"Action","value":"engagement"},{"label":"Auditor","value":"Ernst & Young LLP"}],"fact_type":"auditor_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}