secwatch / observer
8-K filed June 5, 2025, 7:59 PM ET ticker TUSK CIK 0001679268
leadership confidence high sentiment neutral materiality 0.70

Mammoth Energy CEO Phil Lancaster resigns; son Bernard named COO; board changes

MAMMOTH ENERGY SERVICES, INC.

item 5.02

Executive movements

Machine-extracted from this filing. Every card cites the SEC source. See all recent executive movements.

Appointed

Paul Jacobi

Chief Business Officer
TUSK · MAMMOTH ENERGY SERVICES, INC.
Effective
2025-07-01
Filed
June 5, 2025, 7:59 PM ET
the Board named Paul Jacobi as the Company's Chief Business Officer effective July 1, 2025.
Appointed

Bernard Lancaster

Chief Operating Officer and Principal Executive Officer
TUSK · MAMMOTH ENERGY SERVICES, INC.
Effective
2025-07-01
Filed
June 5, 2025, 7:59 PM ET
the Board named Bernard Lancaster as Chief Operating Officer and Principal Executive Officer of the Company effective July 1, 2025.
Departed

Arthur Smith

Director
TUSK · MAMMOTH ENERGY SERVICES, INC.
Effective
2025-06-11
Filed
June 5, 2025, 7:59 PM ET
Arthur Smith, who has served as a director of the Company since the Company's initial public offering, will not stand for re-election at the Company's 2025 Annual Meeting of Stockholders on June 11, 2025 (the "2025 Annual Meeting"), and will retire as a director, chairman of the audit committee and member of the compensation committee and nominating and corporate governance committee, effective as of the date of the 2025 Annual Meeting.
Departed

Phil Lancaster

Chief Executive Officer
TUSK · MAMMOTH ENERGY SERVICES, INC.
Effective
2025-06-30
Successor
Bernard Lancaster
Filed
June 5, 2025, 7:59 PM ET
Mr. P. Lancaster has resigned from his CEO with Mammoth effective as of June 30, 2025.

Key facts

Extracted from this filing and checked against the source text.

Executive change SEC 8-K Item 5.02 confidence 0.95

Paul Jacobi was appointed as Chief Business Officer at MAMMOTH ENERGY SERVICES, INC..

Action
appointed
Role
Chief Business Officer
Exact text from the filing
the Board named Paul Jacobi as the Company's Chief Business Officer effective July 1, 2025.
View on SEC.gov
Executive change SEC 8-K Item 5.02 confidence 0.95

Bernard Lancaster was appointed as Chief Operating Officer and Principal Executive Officer at MAMMOTH ENERGY SERVICES, INC..

Action
appointed
Role
Chief Operating Officer and Principal Executive Officer
Exact text from the filing
the Board named Bernard Lancaster as Chief Operating Officer and Principal Executive Officer of the Company effective July 1, 2025.
View on SEC.gov
Executive change SEC 8-K Item 5.02 confidence 0.95

Arthur Smith departed as Director at MAMMOTH ENERGY SERVICES, INC..

Action
will not stand for re-election, will retire
Role
Director
Exact text from the filing
Arthur Smith, who has served as a director of the Company since the Company's initial public offering, will not stand for re-election at the Company's 2025 Annual Meeting of Stockholders on June 11, 2025 (the "2025 Annual Meeting"), and will retire as a director, chairman of the audit committee and member of the compensation committee and nominating and corporate governance committee, effective as of the date of the 2025 Annual Meeting.
View on SEC.gov
Executive change SEC 8-K Item 5.02 confidence 0.95

Phil Lancaster resigned as Chief Executive Officer at MAMMOTH ENERGY SERVICES, INC..

Action
resigned
Role
Chief Executive Officer
Exact text from the filing
Mr. P. Lancaster has resigned from his CEO with Mammoth effective as of June 30, 2025.
View on SEC.gov

MAMMOTH ENERGY SERVICES, INC. filing history →

Source: SEC EDGAR
accession 0001628280-25-029661
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