{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-24-227910","form_type":"8-K","ticker":"AMTM","cik":"0002011286","company_name":"Amentum Holdings, Inc.","filed_at":"2024-09-27T23:59:59+00:00","discovered_at":"2026-05-14T18:03:15.352846+00:00","generated_at":"2026-05-31T01:24:16.898772+00:00","sec_items":["5.02","5.03","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.5,"calibrated_materiality_score":0.5,"confidence":"high","headline":"Amentum names Stephen A. Arnette as COO; authorizes 1B shares, effects stock split","bullets":["Stephen A. Arnette appointed Chief Operating Officer, effective September 27, 2024.","Board increased authorized shares to 1,000,000,000 via amendment to certificate of incorporation.","Stock split of outstanding common stock resulted in 153,280,369 issued and outstanding shares.","Actions taken in connection with Jacobs Solutions' distribution of Amentum shares to Jacobs stockholders."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-24-227910","json":"https://secwatch.observer/filing/0001193125-24-227910.json","markdown":"https://secwatch.observer/filing/0001193125-24-227910.md","text":"https://secwatch.observer/filing/0001193125-24-227910.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/2011286/000119312524227910/0001193125-24-227910-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/2011286/000119312524227910/d905502d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-31T01:24:16.898772+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":"96f82ba85f","claim":"Stephen A. Arnette was appointed as Chief Operating Officer at Amentum Holdings, Inc..","evidence_excerpt":"appointed Stephen A. Arnette as Chief Operating Officer of the Company, with such appointment to be effective September 27, 2024.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/2011286/000119312524227910/0001193125-24-227910-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"Chief Operating Officer"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}