Results of Operations and Financial Condition On August 7, 2026 , Mammoth Energy Services, Inc. (the “Company”) issued a press release announcing its operational and financial results for the second quarter ended June 30, 2026. A copy of that press release is furnished as Exhibit 99.1 to this report. The information in this Item 2.02, including Exhibit 99.1, 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 incorpo…

Changes in Registrant’s Certifying Accountant. On May 13, 2026, the Audit Committee of the Board of Directors (the “Audit Committee”) of Mammoth Energy Services, Inc. (the “Company”) approved the dismissal of Deloitte & Touche LLP (“Deloitte”) as the Company’s independent registered public accounting firm. The Company informed Deloitte of their dismissal on May 13, 2026. During the Company’s most recent fiscal year ended December 31, 2025 and during the subsequent interim period from January…

Results of Operations and Financial Condition On May 11, 2026 , Mammoth Energy Services, Inc. (the “Company”) issued a press release announcing its operational and financial results for the first quarter ended March 31, 2026. A copy of that press release is furnished as Exhibit 99.1 to this report. The information in this Item 2.02, including Exhibit 99.1, 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 incorpora…

Results of Operations and Financial Condition On March 6, 2026, Mammoth Energy Services, Inc. (the “Company”) issued a press release announcing its operational and financial results for the fourth quarter and full year ended December 31, 2025. A copy of that press release is furnished as Exhibit 99.1 to this report. The information in this Item 2.02, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and wil…

Entry into a Material Definitive Agreement. Equity Purchase Agreement On December 2, 2025, Mammoth Energy Partners LLC ("MEP"), a subsidiary of Mammoth Energy Services, Inc. (“Mammoth” or the “Company”), entered into an Equity Purchase Agreement (the “Agreement”), as the seller, with Qualus, LLC (“Qualus”), as the buyer, and Aquawolf LLC ("Aquawolf"), MEP's wholly-owned subsidiary and the subject of the sale, as a party to the Agreement. Pursuant to the Agreement, MEP sold all equity interest…

Completion of Acquisition or Disposition of Assets. The information set forth above under

Results of Operations and Financial Condition On October 31, 2025, Mammoth Energy Services, Inc. (the “Company”) issued a press release announcing its operational and financial results for the third quarter ended September 30, 2025. A copy of that press release is furnished as Exhibit 99.1 to this report. The information in this Item 2.02, including Exhibit 99.1, 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 in…

Results of Operations and Financial Condition On August 8, 2025, Mammoth Energy Services, Inc. (the “Company”) issued a press release announcing its operational and financial results for the second quarter ended June 30, 2025. A copy of that press release is furnished as Exhibit 99.1 to this report. The information in this Item 2.02, including Exhibit 99.1, 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 incorpor…

Chief Operating Officer — Bernard Lancaster: Bernard Lancaster was promoted to Chief Operating Officer with a defined compensation package.

Entry into a Material Definitive Agreement. On July 2, 2025, Mammoth Energy Services, Inc. (“Mammoth” or the “Company”) entered into a letter agreement with Fifth Third Bank, National Association (“Fifth Third Bank”) (the “Letter Agreement”) in relation to its revolving credit facility with Fifth Third Bank (the “Credit Agreement”) whereby the Revolving Loan Commitments, as defined in the Credit Agreement, are reduced from $75.0 million to $50.0 million. The foregoing summary does not purport…

Director — Mr. Lancaster: Mr. Lancaster was appointed to the Board and is entitled to receive the annual compensation generally given to non-employee directors.

Entry into a Material Definitive Agreement. On June 16, 2025, Stingray Pressure Pumping LLC (“Stingray”) and Mammoth Equipment Leasing LLC (“Mammoth Equipment”), subsidiaries of Mammoth Energy Services, Inc. (“Mammoth” or the “Company”), entered into an Equipment Purchase Agreement (the “Agreement”), as the sellers, with MGB Manufacturing, LLC (“MGB”), as the buyer, pursuant to which Stingray and Mammoth Equipment sold all of the Company’s equipment used in its hydraulic fracturing business,…

Material Impairments. As a result of the Transaction, the Company concluded that the carrying value of goodwill associated with its hydraulic fracturing business exceeds its fair value. As a result, the Company expects to recognize impairment expense during the second quarter of 2025 ranging between $7.7 million and $9.2 million.

Completion of Acquisition or Disposition of Assets. The information set forth above under

Director — Arthur Smith: Mr. Arthur Smith is retiring as a director and chairman of the audit committee, with Mark L. Plaumann appointed to succeed him.

Results of Operations and Financial Condition On May 7, 2025, Mammoth Energy Services, Inc. (the “Company”) issued a press release announcing its operational and financial results for the first quarter ended March 31, 2025. A copy of that press release is furnished as Exhibit 99.1 to this report. The information in this Item 2.02, including Exhibit 99.1, 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 incorporate…

Entry into a Material Definitive Agreement. Equity Interest Purchase Agreement On April 11, 2025, Lion Power Services LLC (“Lion”), a subsidiary of Mammoth Energy Services, Inc. (“Mammoth” or the “Company”), entered into an Equity Interest Purchase Agreement (the “Agreement”), as the seller, with Peak Utility Services Group, Inc., as the buyer, pursuant to which Lion sold all equity interests in its wholly-owned subsidiaries 5 Star Electric, LLC (“5 Star”), Higher Power Electrical, LLC (“High…

The excerpt is incomplete and does not provide sufficient information to determine the nature of the event.

Completion of Acquisition or Disposition of Assets. The information set forth above under

Changes in Registrant’s Certifying Accountant. On March 7, 2025, the Audit Committee of the Board of Directors (the “Audit Committee”) of Mammoth Energy Services, Inc. (the “Company”) approved the dismissal of Grant Thornton LLP (“Grant Thornton”) as the Company’s independent registered public accounting firm. The Company informed Grant Thornton of their dismissal on March 10, 2025. During the Company’s two most recent fiscal years ended December 31, 2024 and December 31, 2023 and during the…

Results of Operations and Financial Condition On March 7, 2025, Mammoth Energy Services, Inc. (the “Company”) issued a press release announcing its operational and financial results for the fourth quarter and full year ended December 31, 2024. A copy of that press release is furnished as Exhibit 99.1 to this report. The information in this Item 2.02, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and wil…

Chief Executive Officer — Phil Lancaster: Phil Lancaster was promoted to Chief Executive Officer with a new compensation package.

CEO — Arty Straehla: Arty Straehla is retiring as CEO and director, with Phil Lancaster succeeding him.

Results of Operations and Financial Condition On November 1, 2024, Mammoth Energy Services, Inc. (the “Company”) issued a press release announcing its operational and financial results for the third quarter ended September 30, 2024. A copy of that press release is furnished as Exhibit 99.1 to this report. The information in this Item 2.02, including Exhibit 99.1, 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 in…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth in