---
schema_version: "secwatch.filing_event.v1"
accession: "0001679268-24-000080"
form_type: "8-K"
ticker: "TUSK"
cik: "0001679268"
company_name: "MAMMOTH ENERGY SERVICES, INC."
filed_at: "2024-11-07T23:59:59+00:00"
generated_at: "2026-05-30T03:37:58.916971+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Mammoth Energy CEO Arty Straehla to retire Dec 31; Phil Lancaster to become CEO Jan 1

## Summary
- Arty Straehla will retire as CEO and resign from the Board, effective December 31, 2024.
- Phil Lancaster, current VP of Corporate Development, will become CEO on January 1, 2025.
- Lancaster has over 20 years of energy industry experience, including prior CEO roles.
- Compensatory terms for Straehla and Lancaster have not been finalized; will be disclosed later.

## SEC filing metadata
- accession: 0001679268-24-000080
- form_type: 8-K
- ticker: TUSK
- cik: 0001679268
- company_name: MAMMOTH ENERGY SERVICES, INC.
- filed_at: 2024-11-07T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1679268/000167926824000080/0001679268-24-000080-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1679268/000167926824000080/tusk-20241106.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001679268-24-000080
- JSON: https://secwatch.observer/filing/0001679268-24-000080.json
- Plain text: https://secwatch.observer/filing/0001679268-24-000080.txt

## Key facts
- Executive change
  Phil Lancaster was appointed as Chief Executive Officer at MAMMOTH ENERGY SERVICES, INC..
  - Action: appointed
  - Role: Chief Executive Officer
  source text: The Company also announced that Phil Lancaster, who currently serves as the Company’s Vice President of Corporate Development, will transition into the role of the Company’s Chief Executive Officer, effective as of January 1, 2025.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1679268/000167926824000080/0001679268-24-000080-index.htm
- Executive change
  Arty Straehla retired as Chief Executive Officer at MAMMOTH ENERGY SERVICES, INC..
  - Action: retired
  - Role: Chief Executive Officer
  source text: Arty Straehla has notified the Company’s Board of Directors (the “Board”) on November 6, 2024 of his decision to retire as the Chief Executive Officer of the Company, effective as of December 31, 2024.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1679268/000167926824000080/0001679268-24-000080-index.htm

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