Mammoth Energy names Bernard Lancaster president
Sentiment and the balance of points
Rhea-AI Sentiment reads the wording of the document, how positive or negative its language is on a 1 to 5 scale. The balance of points shown with the takes weighs what the document actually discloses, so the two can disagree, for example when a trial that missed its main goal is described in upbeat language.
Form Type
8-K
Rhea-AI Filing Summary
Mammoth Energy Services, Inc. (TUSK) appointed Bernard “Bernie” Lancaster president effective November 9, 2026, and he ceased serving as chief operating officer. Lancaster had served as COO since July 2025 and has held leadership positions across Mammoth’s businesses for more than a decade. He is the son of Phil Lancaster, a member of the board.
Filing Explained
The filing adds that Lancaster’s appointment as president did not change his compensation or other compensatory arrangements; the disclosed transition changes his role, not his pay.
8-K Event Classification
3 items: 5.02, 7.01, 9.01
3 items
Item 5.02
Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers
Governance
Key personnel changes including departures, elections, or appointments of directors and executive officers.
Item 7.01
Regulation FD Disclosure
Disclosure
Material non-public information disclosed under Regulation Fair Disclosure, often investor presentations or guidance.
Item 9.01
Financial Statements and Exhibits
Exhibits
Financial statements, pro forma financial information, or exhibit attachments filed with this report.
Key Figures
President appointment effective date: November 9, 2026
COO tenure began: July 2025
Leadership experience at Mammoth: More than a decade
3 metrics
President appointment effective date
November 9, 2026
Effective date of Bernard Lancaster’s appointment
COO tenure began
July 2025
Lancaster had served as chief operating officer since this time
Leadership experience at Mammoth
More than a decade
Lancaster has held leadership positions across the company’s businesses
Key Terms
aviation leasing platform, natural sand proppant, hydraulic fracturing, directional drilling services
4 terms
aviation leasing platform technical
"continued expansion of our aviation leasing platform"
natural sand proppant technical
"natural sand proppant for hydraulic fracturing"
hydraulic fracturing technical
"natural sand proppant for hydraulic fracturing"
Hydraulic fracturing is a method for extracting oil and natural gas that involves injecting pressurized fluid and small solid particles into underground rock to create and hold open tiny cracks, allowing trapped fuel to flow to a well. For investors, it matters because successful fracturing can sharply increase a well’s output and revenue potential, while also carrying higher upfront costs, regulatory scrutiny, and environmental risks that can affect a company’s value.
directional drilling services technical
"directional drilling services"
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
Who became president of Mammoth Energy Services (TUSK)?
Bernard “Bernie” Lancaster became president effective November 9, 2026. He had served as chief operating officer since July 2025 and ceased serving in that role with the appointment.
Did Mammoth change Bernard Lancaster’s compensation when it promoted him?
No. Mammoth said the appointment did not result in any change to his compensation or other compensatory arrangements.
AI-generated analysis. How Rhea-AI works. Not financial advice.
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form 8-K
CURRENT REPORT
| PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 | ||
Date of Report (Date of earliest event reported): November 9, 2026
(Exact name of registrant as specified in its charter)
(Commission File No.)
| (State or other jurisdiction of incorporation or organization) | (I.R.S. Employer Identification No.) | |||||||||||||
| (Address of principal executive offices) | (Registrant’s telephone number, including area code) | (Zip Code) | ||||||||||||
______________________________
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
| Securities registered pursuant to Section 12(b) of The Act: | ||||||||
| Title of each class | Trading Symbol(s) | Name of each exchange on which registered | ||||||
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§232.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).
Emerging Growth Company ¨
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(s) of the Exchange Act. ¨
Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.
On November 9, 2026, the Board of Directors (the “Board”) of Mammoth Energy Services, Inc. (the “Company”) appointed Bernard “Bernie” Lancaster, the Company’s Chief Operating Officer, to serve as President of the Company, effective immediately. In connection with his appointment as President, Mr. Lancaster ceased serving as Chief Operating Officer of the Company.
Mr. Lancaster, age 39, has served as the Company’s Chief Operating Officer since July 2025, following his tenure as Vice President of Operations. Mr. Lancaster has held operational and leadership positions across the Company’s businesses for more than a decade.
Mr. Lancaster is the son of Phil Lancaster, a member of the Board. Other than this relationship, there are no family relationships between Mr. Lancaster and any director or executive officer of the Company. There are no arrangements or understandings between Mr. Lancaster and any other person pursuant to which he was selected to serve as President of the Company, and there are no transactions involving Mr. Lancaster that would be required to be reported pursuant to Item 404(a) of Regulation S-K.
Mr. Lancaster’s appointment as President does not result in any change to his compensation or other compensatory arrangements with the Company.
Item 7.01 Regulation FD Disclosure.
On November 13, 2026, the Company issued a press release announcing Mr. Lancaster’s appointment as President. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.
The information in this Item 7.01 shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed under the Securities Act of 1933, as amended, unless specifically identified as being incorporated by reference in the registration statement.
Item 9.01 Financial Statements and Exhibits.
(d) Exhibits
| Exhibit Number | Description | ||||
99.1 | Press Release, dated November 13, 2026, entitled "Mammoth Announces Promotion of Bernard Lancaster to President" | ||||
| 104 | Cover Page Interactive Data File - the cover page XBRL tags are embedded within the Inline XBRL document. | ||||
Signature
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.
| MAMMOTH ENERGY SERVICES, INC. | |||||||||||||||||
| Date: | November 13, 2026 | By: | /s/ Mark Layton | ||||||||||||||
| Mark Layton | |||||||||||||||||
| Chief Financial Officer and Secretary | |||||||||||||||||
1 News Release Mammoth Announces Promotion of Bernard Lancaster to President OKLAHOMA CITY – November 13, 2026 – Mammoth Energy Services, Inc. (“Mammoth” or the “Company”) (NASDAQ: TUSK) today announced the promotion of Bernard “Bernie” Lancaster from Chief Operating Officer to President, effective November 9, 2026. The promotion recognizes Mr. Lancaster’s leadership and contributions to Mammoth’s ongoing transformation, including improved operating performance across its businesses and the continued expansion of its aviation leasing platform. “Mammoth has made substantial progress this year, including improved operating performance, profitability and margins, as well as the continued expansion of our aviation leasing platform,” said Arthur Amron, Chairman of Mammoth’s Board of Directors. “Bernie has played an important role in executing our strategy, and his promotion reflects the Board’s confidence in his ability to build on that momentum and lead Mammoth through its next phase of growth.” Mr. Lancaster said, “I am grateful to the Board of Directors for the confidence they have placed in me, and I am excited to lead Mammoth as we continue to execute our strategy and grow our businesses. The results we have reported this year reflect the hard work of our teams, and I look forward to building on that progress.” Mr. Lancaster has served as Mammoth’s Chief Operating Officer since July 2025, following his tenure as Vice President of Operations. During more than a decade with the Company, he has held leadership positions across Mammoth’s operating businesses and has played an important role in improving operating performance and executing the Company’s strategic initiatives. About Mammoth Energy Services, Inc. Mammoth Energy Services, Inc. (NASDAQ: TUSK) is a growth-oriented company centered on an expanding aviation leasing platform. Through its rental services segment, Mammoth leases and sells aviation assets and rents heavy equipment used in construction and energy operations. The Company also provides fiber optic services to utility customers; natural sand proppant for hydraulic fracturing; workforce accommodations for projects in remote locations; and directional drilling services. For more information, please visit www.mammothenergy.com. ### Contacts: Mark Layton, CFO Mohammed Topiwala Mammoth Energy Services, Inc. Vizara Advisors - Investor Relations investors@mammothenergy.com TUSK@vizaraadvisors.com Exhibit 99.1