{"schema_version":"secwatch.filing_event.v1","accession":"0001315257-26-000030","form_type":"8-K/A","ticker":"KOP","cik":"0001315257","company_name":"Koppers Holdings Inc.","filed_at":"2026-05-07T23:59:59+00:00","discovered_at":"2026-05-14T18:02:32.116678+00:00","generated_at":"2026-05-14T21:26:07.684042+00:00","sec_items":["5.02","9.01"],"event_type":"other","sentiment":"neutral","materiality_score":0.15,"calibrated_materiality_score":0.15,"confidence":"high","headline":"Koppers Holdings appoints Laura Posadas to three board committees","bullets":["Laura J. Posadas appointed to Audit, Management Development and Compensation, and Strategy and Risk Committees effective May 7, 2026.","The appointment follows her election to the Board on November 5, 2025.","No other changes to board composition or committee structure."],"urls":{"canonical":"https://secwatch.observer/filing/0001315257-26-000030","json":"https://secwatch.observer/filing/0001315257-26-000030.json","markdown":"https://secwatch.observer/filing/0001315257-26-000030.md","text":"https://secwatch.observer/filing/0001315257-26-000030.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1315257/000131525726000030/0001315257-26-000030-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1315257/000131525726000030/kop-20251105.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-14T21:26:07.684042+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"}