{"schema_version":"secwatch.filing_event.v1","accession":"0000950170-22-010282","form_type":"8-K","ticker":"UCTT","cik":"0001275014","company_name":"Ultra Clean Holdings, Inc.","filed_at":"2022-05-18T23:59:59+00:00","discovered_at":"2026-05-14T18:04:00.054495+00:00","generated_at":"2026-06-25T09:47:12.135517+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.35,"calibrated_materiality_score":0.35,"confidence":"high","headline":"Ultra Clean Holdings CAO Chris Siu Resigns, Effective Immediately","bullets":["Chris Siu resigned as Chief Accounting Officer and principal accounting officer effective May 16, 2022.","Resignation was not due to any disagreement with the company on operations, policies, or practices.","No replacement has been announced as of the filing date."],"urls":{"canonical":"https://secwatch.observer/filing/0000950170-22-010282","json":"https://secwatch.observer/filing/0000950170-22-010282.json","markdown":"https://secwatch.observer/filing/0000950170-22-010282.md","text":"https://secwatch.observer/filing/0000950170-22-010282.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1275014/000095017022010282/0000950170-22-010282-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1275014/000095017022010282/uctt-20220516.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-25T09:47:12.135517+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":"d899bdb6d6","claim":"Chris Siu resigned as Chief Accounting Officer at Ultra Clean Holdings, Inc..","evidence_excerpt":"On May 16, 2022, Chris Siu, Chief Accounting Officer of Ultra Clean Holdings, Inc. (the “Company”), resigned from such position, and will no longer act as the Company’s principal accounting officer effective immediately.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1275014/000095017022010282/0000950170-22-010282-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"resigned"},{"label":"Role","value":"Chief Accounting Officer"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}