secwatch.observer — SEC 8-K summary
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Issuer:     MAMMOTH ENERGY SERVICES, INC. (TUSK)
CIK:        0001679268
Form:       8-K
Filed at:   2025-06-05T23:59:59+00:00
Accession:  0001628280-25-029661
Event type: leadership
Sentiment:  neutral
Materiality: 0.70
Item codes: 5.02
LLM model:  deepseek-v4-flash:cloud@v2

Mammoth Energy CEO Phil Lancaster resigns; son Bernard named COO; board changes
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- CEO Phil Lancaster resigns effective June 30, 2025; will become non-voting board observer June 11.
- Bernard Lancaster, son of Phil, appointed COO and Principal Executive Officer effective July 1, 2025.
- Paul Jacobi appointed Chief Business Officer effective July 1; resigns from board committees, loses independent status.
- Arthur Smith to retire from board at June 11 annual meeting; Mark Plaumann appointed audit committee chair and director.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/1679268/000162828025029661/0001628280-25-029661-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/1679268/000162828025029661/tusk-20250530.htm
  HTML page:      https://secwatch.observer/filing/0001628280-25-029661

License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer