{"schema_version":"secwatch.filing_event.v1","accession":"0001171843-25-003962","form_type":"8-K","ticker":"APTOF","cik":"0000882361","company_name":"Aptose Biosciences Inc.","filed_at":"2025-06-18T23:59:59+00:00","discovered_at":"2026-05-14T18:02:51.582000+00:00","generated_at":"2026-05-19T03:58:20.668158+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.25,"calibrated_materiality_score":0.25,"confidence":"high","headline":"Board director Carol Ashe resigns from Aptose Biosciences, effective immediately","bullets":["Carol Ashe resigned from the Board of Aptose Biosciences effective June 16, 2025.","Resignation not due to any disagreement with the company's operations, policies, or practices.","No replacement director named in the filing."],"urls":{"canonical":"https://secwatch.observer/filing/0001171843-25-003962","json":"https://secwatch.observer/filing/0001171843-25-003962.json","markdown":"https://secwatch.observer/filing/0001171843-25-003962.md","text":"https://secwatch.observer/filing/0001171843-25-003962.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/882361/000117184325003962/0001171843-25-003962-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/882361/000117184325003962/f8k_061825.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-19T03:58:20.668158+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":"d504380aab","claim":"Carol Ashe resigned as member of the Board at Aptose Biosciences Inc..","evidence_excerpt":"On June 16, 2025, Carol Ashe notified the Board of Directors (the “Board”) of Aptose Biosciences Inc. (the “Company”) of her intention to resign from her role as a member of the Board effective immediately.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/882361/000117184325003962/0001171843-25-003962-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"resigned"},{"label":"Role","value":"member of the Board"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}