{"schema_version":"secwatch.filing_event.v1","accession":"0001171843-25-002427","form_type":"8-K","ticker":"APTOF","cik":"0000882361","company_name":"Aptose Biosciences Inc.","filed_at":"2025-04-23T23:59:59+00:00","discovered_at":"2026-05-14T18:02:51.579633+00:00","generated_at":"2026-05-23T08:45:07.842343+00:00","sec_items":["7.01","9.01"],"event_type":"other_material","sentiment":"negative","materiality_score":0.55,"calibrated_materiality_score":0.55,"confidence":"high","headline":"KPMG not standing for re-appointment as Aptose auditor; material weakness disclosed","bullets":["KPMG informed Aptose on April 15, 2025 it will not stand for re-appointment for the 2025 annual audit.","No disagreements on accounting principles or practices between KPMG and Aptose during fiscal years 2024/2023 and through April 15, 2025.","KPMG identified a material weakness in internal control over financial reporting for complex financial instruments (warrants) as per 2024 10-K.","Company has initiated process to appoint a new independent registered public accounting firm; KPMG authorized to respond to successor.","KPMG issued unqualified reports on 2024 and 2023 financial statements; no internal control report due to smaller reporting company status."],"urls":{"canonical":"https://secwatch.observer/filing/0001171843-25-002427","json":"https://secwatch.observer/filing/0001171843-25-002427.json","markdown":"https://secwatch.observer/filing/0001171843-25-002427.md","text":"https://secwatch.observer/filing/0001171843-25-002427.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/882361/000117184325002427/0001171843-25-002427-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/882361/000117184325002427/f8k_042325.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-23T08:45:07.842343+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":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}