---
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"
generated_at: "2026-05-18T13:22:10.455620+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Mammoth Energy appoints departing CEO Phil Lancaster to board; chairman Amron deemed independent

## Summary
- 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.

## SEC filing metadata
- 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
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02
- 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

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-25-033509
- JSON: https://secwatch.observer/filing/0001628280-25-033509.json
- Plain text: https://secwatch.observer/filing/0001628280-25-033509.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.