Form 8-K
8-K — MAMMOTH ENERGY SERVICES, INC.
Accession: 0001628280-26-045745
Filed: 2026-06-26
Period: 2026-06-25
CIK: 0001679268
SIC: 1389 (OIL, GAS FIELD SERVICES, NBC)
Item: Submission of Matters to a Vote of Security Holders
Documents
8-K — tusk-20260625.htm (Primary)
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8-K
8-K (Primary)
Filename: tusk-20260625.htm · Sequence: 1
tusk-20260625
0001679268FALSE00016792682026-06-252026-06-25
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): June 25, 2026
Mammoth Energy Services, Inc.
(Exact name of registrant as specified in its charter)
001-37917
(Commission File No.)
Delaware 32-0498321
(State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)
14201 Caliber Drive, Suite 300
Oklahoma City, Oklahoma (405) 608-6007 73134
(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:
¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Securities registered pursuant to Section 12(b) of The Act:
Title of each class Trading Symbol(s) Name of each exchange on which registered
Common Stock TUSK The Nasdaq Stock Market LLC
NASDAQ Global Select Market
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 5.07. Submission of Matters to a Vote of Security Holders.
On June 25, 2026, Mammoth Energy Services, Inc. (the “Company”) held its Annual Meeting of Stockholders (the “Annual Meeting”). The Annual Meeting was held at 14201 Caliber Drive, Suite 300, Oklahoma City, Oklahoma. At the Annual Meeting, the Company’s stockholders voted on four proposals, a more detailed description of which is included in the Company’s definitive proxy statement filed with the Securities and Exchange Commission on May 15, 2026, and incorporated by reference in this report. The following is a brief description of each matter voted upon and the results of such voting, including the number of votes cast for each matter and the number of votes cast against, abstentions, and broker non-votes, if applicable, with respect to each matter.
Proposal 1
Arthur Amron, Corey Booker, Paul Jacobi, Phil Lancaster, James Palm and Mark Plaumann were elected to continue to serve as the Company’s directors until the 2027 Annual Meeting of Stockholders and until their respective successors are elected and qualified, or until their earlier death, resignation or removal. The results of the vote on Proposal 1 were as follows:
Name of Nominee For Against Abstain Non-Votes
Arthur Amron 35,060,078 1,519,819 13,901 5,550,784
Corey Booker 36,086,616 483,459 23,723 5,550,784
Paul Jacobi 36,167,165 413,462 13,171 5,550,784
Phil Lancaster 36,268,346 314,406 11,046 5,550,784
James Palm 33,638,074 2,944,525 11,199 5,550,784
Mark Plaumann 35,401,066 1,181,523 11,209 5,550,784
Proposal 2
The Company’s stockholders approved, on an advisory basis, the compensation paid to the Company’s named executive officers. The results of the vote on Proposal 2 were as follows:
For Against Abstain Non-Votes
36,252,635 264,334 76,829 5,550,784
Proposal 3
The Company’s stockholders voted, on an advisory basis, in favor of holding a future advisory stockholder vote to approve the Company’s executive compensation on an annual basis. The results of the vote on Proposal 3 were as follows:
1 Year 2 Years 3 Years Abstain Non-Votes
35,911,762 4,130 641,206 36,700 5,550,784
Proposal 4
The appointment of Carr, Riggs & Ingram L.L.C. as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2026 was ratified. The results of the vote on Proposal 4 were as follows:
For Against Abstain Non-Votes
42,054,219 87,134 3,229 —
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: June 26, 2026 By: /s/ Mark Layton
Mark Layton
Chief Financial Officer and Secretary
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