{"schema_version":"secwatch.filing_event.v1","accession":"0001628280-25-033509","form_type":"8-K","ticker":"TUSK","cik":"0001679268","company_name":"MAMMOTH ENERGY SERVICES, INC.","filed_at":"2025-06-30T23:59:59+00:00","discovered_at":"2026-05-14T18:02:49.310996+00:00","generated_at":"2026-05-18T13:22:10.455620+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.6,"calibrated_materiality_score":0.6,"confidence":"high","headline":"Mammoth Energy appoints departing CEO Phil Lancaster to board; chairman Amron deemed independent","bullets":["Phil Lancaster appointed as non-independent board member effective July 1, 2025, after CEO resignation.","Lancaster receives standard director compensation: $50k annual retainer plus $5k per meeting attended.","Chairman Arthur Amron confirmed independent under Nasdaq rules; majority of six directors now independent."],"urls":{"canonical":"https://secwatch.observer/filing/0001628280-25-033509","json":"https://secwatch.observer/filing/0001628280-25-033509.json","markdown":"https://secwatch.observer/filing/0001628280-25-033509.md","text":"https://secwatch.observer/filing/0001628280-25-033509.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1679268/000162828025033509/0001628280-25-033509-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1679268/000162828025033509/tusk-20250624.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-18T13:22:10.455620+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"}