{"schema_version":"secwatch.filing_event.v1","accession":"0001104659-23-057146","form_type":"8-K","ticker":"TTEK","cik":"0000831641","company_name":"TETRA TECH INC","filed_at":"2023-05-08T23:59:59+00:00","discovered_at":"2026-05-14T18:03:42.386696+00:00","generated_at":"2026-06-15T15:05:23.307544+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.4,"calibrated_materiality_score":0.4,"confidence":"high","headline":"Tetra Tech SVP Derek Amidon resigns effective May 12, 2023","bullets":["Derek Amidon, SVP and President of Commercial/International Services Group and Energy Engineering Division, resigns.","Resignation effective May 12, 2023; no successor named in the filing.","No reason for departure disclosed; the filing is a standard 8-K Item 5.02 disclosure."],"urls":{"canonical":"https://secwatch.observer/filing/0001104659-23-057146","json":"https://secwatch.observer/filing/0001104659-23-057146.json","markdown":"https://secwatch.observer/filing/0001104659-23-057146.md","text":"https://secwatch.observer/filing/0001104659-23-057146.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/831641/000110465923057146/0001104659-23-057146-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/831641/000110465923057146/tm2314793d1_8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-15T15:05:23.307544+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":"4123ea08a1","claim":"Derek Amidon resigned as Senior Vice President, President, Commercial/International Services Group and President, Energy Engineering Division at TETRA TECH INC.","evidence_excerpt":"On May 2, 2023, Derek Amidon, Senior Vice President, President, Commercial/International Services Group and President, Energy Engineering Division, notified Tetra Tech, Inc. of his resignation, effective May 12, 2023.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/831641/000110465923057146/0001104659-23-057146-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"resigned"},{"label":"Role","value":"Senior Vice President, President, Commercial/International Services Group and President, Energy Engineering Division"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}