{"schema_version":"secwatch.filing_event.v1","accession":"0001297184-21-000051","form_type":"8-K","ticker":"AMPH","cik":"0001297184","company_name":"Amphastar Pharmaceuticals, Inc.","filed_at":"2021-08-10T23:59:59+00:00","discovered_at":"2026-05-14T18:04:17.544380+00:00","generated_at":"2026-06-29T16:19:53.872895+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.3,"calibrated_materiality_score":0.3,"confidence":"high","headline":"Director Richard Koo to retire from Amphastar Board effective Sept 30, 2021","bullets":["Richard Koo announced retirement from Board effective September 30, 2021; not due to any disagreement.","Koo served 18 years on the Board; departure planned and amicable.","No successor or additional board changes announced in the filing."],"urls":{"canonical":"https://secwatch.observer/filing/0001297184-21-000051","json":"https://secwatch.observer/filing/0001297184-21-000051.json","markdown":"https://secwatch.observer/filing/0001297184-21-000051.md","text":"https://secwatch.observer/filing/0001297184-21-000051.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1297184/000129718421000051/0001297184-21-000051-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1297184/000129718421000051/amph-20210805x8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-29T16:19:53.872895+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":"2807f22e10","claim":"Richard Koo retired as Director at Amphastar Pharmaceuticals, Inc..","evidence_excerpt":"On August 5, 2021, Richard Koo announced his retirement from the Board of Directors (the “Board”) of Amphastar Pharmaceuticals, Inc. (the “Company”) effective as of September 30, 2021.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1297184/000129718421000051/0001297184-21-000051-index.htm","confidence":1.0,"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"}