{"schema_version":"secwatch.filing_event.v1","accession":"0000950170-24-016425","form_type":"8-K","ticker":"KALU","cik":"0000811596","company_name":"KAISER ALUMINUM CORP","filed_at":"2024-02-16T23:59:59+00:00","discovered_at":"2026-05-14T18:03:26.984612+00:00","generated_at":"2026-06-06T00:32:13.227700+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.25,"calibrated_materiality_score":0.25,"confidence":"high","headline":"Kaiser Aluminum director Alfred Osborne to retire June 11, 2024","bullets":["Director Alfred E. Osborne, Jr. notified board of retirement effective June 11, 2024.","Retirement not due to any disagreement with the company on operations, policies, or practices.","Board expects to reduce size from 11 to 10 directors upon effective date."],"urls":{"canonical":"https://secwatch.observer/filing/0000950170-24-016425","json":"https://secwatch.observer/filing/0000950170-24-016425.json","markdown":"https://secwatch.observer/filing/0000950170-24-016425.md","text":"https://secwatch.observer/filing/0000950170-24-016425.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/811596/000095017024016425/0000950170-24-016425-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/811596/000095017024016425/kalu-20240212.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-06T00:32:13.227700+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":"053c72f20c","claim":"Alfred E. Osborne, Jr. retired as Director at KAISER ALUMINUM CORP.","evidence_excerpt":"On February 12, 2024, Alfred E. Osborne, Jr. notified the board of directors (the “Board”) of Kaiser Aluminum Corporation (the “Company”) of his decision to retire as a director of the Company effective June 11, 2024 (the “Effective Date”).","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/811596/000095017024016425/0000950170-24-016425-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"retired"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}