{"schema_version":"secwatch.filing_event.v1","accession":"0000950170-24-052134","form_type":"8-K/A","ticker":"KOP","cik":"0001315257","company_name":"Koppers Holdings Inc.","filed_at":"2024-05-02T23:59:59+00:00","discovered_at":"2026-05-14T18:03:17.800885+00:00","generated_at":"2026-06-03T00:07:44.704726+00:00","sec_items":["5.02","9.01"],"event_type":"other","sentiment":"neutral","materiality_score":0.25,"calibrated_materiality_score":0.25,"confidence":"high","headline":"Koppers appoints Director Vartanian to Audit, Strategy and Risk, and Sustainability committees","bullets":["Nishan J. Vartanian appointed to Audit Committee, Strategy and Risk Committee, and Sustainability Committee, effective May 2, 2024.","Board had deferred committee assignments at Vartanian's election on February 13, 2024.","This 8-K/A amends the original 8-K to provide the committee details."],"urls":{"canonical":"https://secwatch.observer/filing/0000950170-24-052134","json":"https://secwatch.observer/filing/0000950170-24-052134.json","markdown":"https://secwatch.observer/filing/0000950170-24-052134.md","text":"https://secwatch.observer/filing/0000950170-24-052134.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1315257/000095017024052134/0000950170-24-052134-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1315257/000095017024052134/kop-20240502.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-03T00:07:44.704726+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"}