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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form 10-Q

☒ | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2026

☐ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE TRANSITION PERIOD FROM TO
Commission File No. 001-37917
Mammoth Energy Services, Inc.
(Exact name of registrant as specified in its charter)

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)
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 (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer |  | ☐ |  | Accelerated filer |  | ☒
Non-accelerated filer |  | ☐ |  | Smaller reporting company |  | ☒
|  |  |  | Emerging growth company |  | ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒
As of August 4, 2026, there were 48,127,585 shares of common stock, $0.01 par value, outstanding.

MAMMOTH ENERGY SERVICES, INC.
TABLE OF CONTENTS

|  | Page
| Cautionary Note Regarding Forward-Looking Statements | i
PART I. FINANCIAL INFORMATION | 1
Item 1. | Condensed Consolidated Financial Statements (Unaudited) | 1
| Condensed Consolidated Balance Sheets | 1
| Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) | 2
| Condensed Consolidated Statements of Changes in Equity | 3
| Condensed Consolidated Statements of Cash Flows | 4
| Notes to Unaudited Condensed Consolidated Financial Statements | 6
Item 2. | Management’s Discussion and Analysis of Financial Condition and Results of Operations | 32
Item 3. | Quantitative and Qualitative Disclosures About Market Risk | 45
Item 4. | Controls and Procedures | 45
PART II. OTHER INFORMATION | 47
Item 1. | Legal Proceedings | 47
Item 1A. | Risk Factors | 47
Item 2. | Unregistered Sales of Equity Securities and Use of Proceeds | 47
Item 3. | Defaults Upon Senior Securities | 47
Item 4. | Mine Safety Disclosures | 47
Item 5. | Other Information | 47
Item 6. | Exhibits | 48
SIGNATURES | 49

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS
This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements include statements regarding our expectations, plans, objectives, strategies, future events, future revenues, future operations, capital expenditures, liquidity, acquisitions, business trends and other statements that are not historical facts. Forward-looking statements may be identified by words such as "may," "will," "could," "should," "expect," "anticipate," "plan," "intend," "believe," "estimate," "project," "forecast," "target," "continue," "potential," or similar expressions, and the negative thereof.
Forward-looking statements are based on current expectations, estimates and assumptions and are subject to risks and uncertainties, many of which are beyond management's control. As a result, actual outcomes and results may differ materially from those expressed or implied by these forward-looking statements. The forward-looking statements contained in this report speak only as of the date of this report and are based on information available to us as of that date. Except as required by applicable law, we undertake no obligation to update or revise any forward-looking statement, whether as a result of new information, future events or otherwise, and readers are cautioned not to place undue reliance on these forward-looking statements. Factors that could cause actual results to differ materially from those expressed or implied by these forward-looking statements include, among others:
•general economic, financial and industry conditions, including inflation, commodity price volatility and fluctuations in customer spending and capital expenditure activity;
•conditions in the energy, infrastructure, aviation, rental equipment and natural sand proppant markets that affect demand for our services and products;
•our ability to execute our business strategy, grow existing operations, integrate acquisitions and identify additional growth opportunities;
•the availability and cost of labor, equipment, materials, replacement parts and other operational resources;
•customer concentration, customer payment risks and our ability to collect outstanding receivables, including the timing and collectability of amounts owed by the Puerto Rico Electric Power Authority ("PREPA");
•governmental actions, regulations, permitting requirements, trade policies, tariffs and other legal or regulatory developments;
•litigation, claims, investigations and other contingent liabilities;
•weather events, natural disasters, acts of war, terrorism, civil unrest, cybersecurity incidents and other events beyond our control; and
•the other risks and uncertainties described under Part II, Item 1A, "Risk Factors" in this Quarterly Report on Form 10-Q and in our Annual Report on Form 10-K for the year ended December 31, 2025.
i

MAMMOTH ENERGY SERVICES, INC.
PART I. FINANCIAL INFORMATION
Item 1. Financial Statements
MAMMOTH ENERGY SERVICES, INC.
CONDENSED CONSOLIDATED BALANCE SHEETS
(unaudited)

ASSETS |  | June 30, |  | December 31,
|  | 2026 |  | 2025
CURRENT ASSETS |  | (in thousands, except share data)
Cash and cash equivalents |  | $ | 50,869 |  |  | $ | 101,987 |
Marketable securities |  | 26,150 |  |  | 19,635 |
Restricted cash |  | 11,914 |  |  | 12,085 |
Accounts receivable, net |  | 39,402 |  |  | 28,934 |
Inventories |  | 11,043 |  |  | 4,083 |
Current assets held for sale |  | 2,227 |  |  | 4,287 |
Other current assets |  | 3,066 |  |  | 4,619 |
Current assets of discontinued operations |  | 1,334 |  |  | 1,518 |
Total current assets |  | 146,005 |  |  | 177,148 |
Property, plant and equipment, net |  | 149,909 |  |  | 106,097 |
Sand reserves, net |  | 39,369 |  |  | 39,613 |
Operating lease right-of-use assets |  | 3,518 |  |  | 2,591 |
Goodwill |  | 1,462 |  |  | — |
Other non current assets |  | 5,693 |  |  | 5,767 |
Noncurrent assets of discontinued operations |  | 6 |  |  | 3,678 |
Total assets |  | $ | 345,962 |  |  | $ | 334,894 |
LIABILITIES AND EQUITY |  |  |  |
CURRENT LIABILITIES |  |  |  |
Accounts payable |  | $ | 11,557 |  |  | $ | 9,327 |
Accrued expenses and other current liabilities |  | 19,875 |  |  | 18,336 |
Current operating lease liabilities |  | 2,359 |  |  | 2,071 |
Income taxes payable |  | 41,421 |  |  | 39,899 |
Current liabilities of discontinued operations |  | 298 |  |  | 383 |
Total current liabilities |  | 75,510 |  |  | 70,016 |
Deferred income tax liabilities |  | 3,345 |  |  | 2,430 |
Long-term operating lease liabilities |  | 1,617 |  |  | 1,375 |
Asset retirement obligations |  | 2,777 |  |  | 2,759 |
Other long-term liabilities |  | 324 |  |  | 26 |
Total liabilities |  | 83,573 |  |  | 76,606 |
COMMITMENTS AND CONTINGENCIES (Note 18) |  |  |  |
EQUITY |  |  |  |
Equity: |  |  |  |
Common stock, $0.01 par value, 200,000,000 shares authorized, 48,127,585 and 48,358,315 issued and outstanding at June 30, 2026 and December 31, 2025, respectively |  | 481 |  |  | 483 |
Additional paid-in capital |  | 540,848 |  |  | 540,841 |
Accumulated deficit |  | (274,619) |  |  | (279,046) |
Accumulated other comprehensive loss |  | (4,321) |  |  | (3,990) |
Total equity |  | 262,389 |  |  | 258,288 |
Total liabilities and equity |  | $ | 345,962 |  |  | $ | 334,894 |

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.
1

MAMMOTH ENERGY SERVICES, INC.
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)
(unaudited)

| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2026 |  | 2025 |  | 2026 |  | 2025
REVENUE | (in thousands, except per share amounts)
Services revenue | $ | 15,882 |  |  | $ | 6,402 |  |  | $ | 27,052 |  |  | $ | 11,216 |
Services revenue - related parties | 197 |  |  | 575 |  |  | 694 |  |  | 652 |
Product revenue | 9,975 |  |  | 5,376 |  |  | 20,339 |  |  | 12,115 |
Total revenue | 26,054 |  |  | 12,353 |  |  | 48,085 |  |  | 23,983 |
COST, EXPENSES AND GAINS |  |  |  |  |  |  |
Services cost of revenue (exclusive of depreciation, depletion, amortization and accretion of $3,958, $6,999, $1,414 and $2,621 for the three and six months ended June 30, 2026 and 2025, respectively) | 9,488 |  |  | 5,744 |  |  | 15,742 |  |  | 10,239 |
Services cost of revenue - related parties | — |  |  | 96 |  |  | — |  |  | 192 |
Product cost of revenue (exclusive of depreciation, depletion, amortization and accretion of $676, $1,105, $1,413 and $2,289 for the three and six months ended June 30, 2026 and 2025, respectively) | 9,713 |  |  | 5,263 |  |  | 19,966 |  |  | 10,738 |
Selling, general and administrative | 4,232 |  |  | 4,958 |  |  | 7,828 |  |  | 9,074 |
Depreciation, depletion, amortization and accretion | 4,634 |  |  | 2,827 |  |  | 8,104 |  |  | 4,910 |
Gains on disposal of assets, net | (4,641) |  |  | (1,077) |  |  | (5,316) |  |  | (4,549) |
Impairment of long-lived assets | — |  |  | 31,669 |  |  | — |  |  | 31,669 |
Total cost, expenses and gains, net | 23,426 |  |  | 49,480 |  |  | 46,324 |  |  | 62,273 |
Operating income (loss) | 2,628 |  |  | (37,127) |  |  | 1,761 |  |  | (38,290) |
OTHER INCOME (EXPENSE) |  |  |  |  |  |  |
Interest (expense) income, net | (784) |  |  | 298 |  |  | (270) |  |  | 383 |
(Loss) gain on marketable securities, net | (1,116) |  |  | — |  |  | 5,987 |  |  | — |
Other expense, net | (73) |  |  | (628) |  |  | (682) |  |  | (960) |
Total other (expense) income, net | (1,973) |  |  | (330) |  |  | 5,035 |  |  | (577) |
Net income (loss) from continuing operations before income taxes | 655 |  |  | (37,457) |  |  | 6,796 |  |  | (38,867) |
Provision (benefit) for income taxes | 1,853 |  |  | (934) |  |  | 3,309 |  |  | (97) |
Net (loss) income from continuing operations | (1,198) |  |  | (36,523) |  |  | 3,487 |  |  | (38,770) |
Net income from discontinued operations, net of income taxes | 438 |  |  | 45,371 |  |  | 940 |  |  | 47,081 |
Net (loss) income | $ | (760) |  |  | $ | 8,848 |  |  | $ | 4,427 |  |  | $ | 8,311 |
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |
Foreign currency translation adjustment | $ | (213) |  |  | $ | 478 |  |  | $ | (331) |  |  | $ | 497 |
Other comprehensive (loss) income | (213) |  |  | 478 |  |  | (331) |  |  | 497 |
Comprehensive (loss) income | $ | (973) |  |  | $ | 9,326 |  |  | $ | 4,096 |  |  | $ | 8,808 |
Net income (loss) per share from continuing operations, basic and diluted (Note 14) | $ | (0.02) |  |  | $ | (0.76) |  |  | $ | 0.07 |  |  | $ | (0.80) |
Net income per share from discontinued operations, basic and diluted (Note 14) | 0.01 |  |  | 0.94 |  |  | 0.02 |  |  | 0.98 |
Net (loss) income per share, basic and diluted (Note 14) | $ | (0.01) |  |  | $ | 0.18 |  |  | $ | 0.09 |  |  | $ | 0.18 |
Weighted average number of shares outstanding, basic and diluted (Note 14) | 48,164 |  |  | 48,225 |  |  | 48,247 |  |  | 48,188 |

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.
2

MAMMOTH ENERGY SERVICES, INC.
CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY
(unaudited)

| Three Months Ended June 30, 2026
|  |  |  |  | Accumulated |
|  |  | Additional |  | Other |
| Common Stock | Paid-In | Accumulated | Comprehensive |
| Shares | Amount | Capital | Deficit | Loss | Total Equity
| (in thousands)
Balance at March 31, 2026 | 48,170 |  | $ | 481 |  | $ | 540,435 |  | $ | (273,859) |  | $ | (4,108) |  | $ | 262,949 |
Common stock repurchased and retired | (43) |  | — |  | (131) |  | — |  | — |  | (131) |
Equity based compensation (Note 15) | — |  | — |  | 544 |  | — |  | — |  | 544 |
Net loss | — |  | — |  | — |  | (760) |  | — |  | (760) |
Other comprehensive loss | — |  | — |  | — |  | — |  | (213) |  | (213) |
Balance at June 30, 2026 | 48,127 |  | $ | 481 |  | $ | 540,848 |  | $ | (274,619) |  | $ | (4,321) |  | $ | 262,389 |
| Three Months Ended June 30, 2025
|  |  |  |  | Accumulated |
|  |  | Additional |  | Other |
| Common Stock | Paid-In | Accumulated | Comprehensive |
| Shares | Amount | Capital | Deficit | Loss | Total Equity
| (in thousands)
Balance at March 31, 2025 | 48,127 |  | $ | 481 |  | $ | 540,642 |  | $ | (284,180) |  | $ | (4,432) |  | $ | 252,511 |
Stock based compensation | 67 |  | 1 |  | 200 |  | — |  | — |  | 201 |
Net income | — |  | — |  | — |  | 8,848 |  | — |  | 8,848 |
Other comprehensive income | — |  | — |  | — |  | — |  | 478 |  | 478 |
Balance at June 30, 2025 | 48,194 |  | $ | 482 |  | $ | 540,842 |  | $ | (275,332) |  | $ | (3,954) |  | $ | 262,038 |
| Six Months Ended June 30, 2026
|  |  |  |  | Accumulated |
|  |  | Additional |  | Other |
| Common Stock | Paid-In | Accumulated | Comprehensive |
| Shares | Amount | Capital | Deficit | Loss | Total Equity
| (in thousands)
Balance at December 31, 2025 | 48,358 |  | $ | 483 |  | $ | 540,841 |  | $ | (279,046) |  | $ | (3,990) |  | $ | 258,288 |
Common stock repurchased and retired | (231) |  | (2) |  | (537) |  | — |  | — |  | (539) |
Equity based compensation (Note 15) | — |  | — |  | 544 |  | — |  | — |  | 544 |
Net income | — |  | — |  | — |  | 4,427 |  | — |  | 4,427 |
Other comprehensive loss | — |  | — |  | — |  | — |  | (331) |  | (331) |
Balance at June 30, 2026 | 48,127 |  | $ | 481 |  | $ | 540,848 |  | $ | (274,619) |  | $ | (4,321) |  | $ | 262,389 |
| Six Months Ended June 30, 2025
|  |  |  |  | Accumulated |
|  |  | Additional |  | Other |
| Common Stock | Paid-In | Accumulated | Comprehensive |
| Shares | Amount | Capital | Deficit | Loss | Total Equity
| (in thousands)
Balance at December 31, 2024 | 48,127 |  | $ | 481 |  | $ | 540,431 |  | $ | (283,643) |  | $ | (4,451) |  | $ | 252,818 |
Stock based compensation | 67 |  | 1 |  | 411 |  | — |  | — |  | 412 |
Net income | — |  | — |  | — |  | 8,311 |  | — |  | 8,311 |
Other comprehensive income | — |  | — |  | — |  | — |  | 497 |  | 497 |
Balance at June 30, 2025 | 48,194 |  | $ | 482 |  | $ | 540,842 |  | $ | (275,332) |  | $ | (3,954) |  | $ | 262,038 |

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.
3

MAMMOTH ENERGY SERVICES, INC.
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(unaudited)

| Six Months Ended June 30,
| 2026 |  | 2025
| (in thousands)
Cash flows from operating activities: |  |  |
Net income | $ | 4,427 |  |  | $ | 8,311 |
Less: Net income from discontinued operations, net of income taxes | 940 |  |  | 47,081 |
Net income (loss) from continuing operations | 3,487 |  |  | (38,770) |
Adjustments to reconcile net income (loss) from continuing operations to net cash used in operating activities: |  |  |
Stock based compensation | — |  |  | 412 |
Depreciation, depletion, amortization and accretion | 8,104 |  |  | 4,910 |
Amortization of debt origination costs | 1,432 |  |  | 354 |
Gains on disposal of assets, net | (5,316) |  |  | (4,549) |
Gains from sale of aviation equipment | (700) |  |  | — |
Gains from sales of equipment damaged or lost down-hole | (230) |  |  | — |
Impairment of long-lived assets | — |  |  | 31,669 |
Gain on marketable securities, net | (5,987) |  |  | — |
Other | 1,750 |  |  | (1,839) |
Changes in assets and liabilities: |  |  |
Accounts receivable, net | (9,331) |  |  | (702) |
Inventories | (6,960) |  |  | 531 |
Other current assets | 532 |  |  | 3,271 |
Accounts payable | 187 |  |  | (1,588) |
Accrued expenses and other liabilities | 1,273 |  |  | (4,893) |
Income taxes payable | 1,535 |  |  | 3,440 |
Net cash used in operating activities from continuing operations | (10,224) |  |  | (7,754) |
Net cash provided by (used in) operating activities from discontinued operations | 200 |  |  | (2,059) |
Net cash used in operating activities | (10,024) |  |  | (9,813) |
Cash flows from investing activities: |  |  |
Purchases of property, plant and equipment | (55,669) |  |  | (27,334) |
Business acquisitions, net of cash transferred | (5,748) |  |  | — |
Proceeds from disposal of property, plant and equipment | 8,383 |  |  | 4,942 |
Proceeds from sale of aviation equipment | 8,500 |  |  | — |
Purchases of marketable securities | (7,929) |  |  | — |
Distributions received from publicly traded limited partnerships | 665 |  |  | — |
Proceeds from sale of marketable securities | 6,736 |  |  | — |
Net cash used in investing activities from continuing operations | (45,062) |  |  | (22,392) |
Net cash provided by investing activities from discontinued operations | 4,581 |  |  | 111,258 |
Net cash (used in) provided by investing activities | (40,481) |  |  | 88,866 |
Cash flows from financing activities: |  |  |
Principal payments on finance leases and equipment financing notes | (136) |  |  | (253) |
Common stock repurchased and retired | (534) |  |  | — |
Net cash used in financing activities from continuing operations | (670) |  |  | (253) |
Net cash used in financing activities from discontinued operations | — |  |  | (3,848) |
Net cash used in financing activities | (670) |  |  | (4,101) |
Effect of foreign exchange rate on cash | (111) |  |  | 113 |
Net (decrease) increase in cash, cash equivalents and restricted cash | (51,286) |  |  | 75,065 |
Cash, cash equivalents and restricted cash at beginning of period | 114,124 |  |  | 82,326 |
Cash, cash equivalents and restricted cash at end of period | 62,838 |  |  | 157,391 |
Less: Cash, cash equivalents and restricted cash of discontinued operations at end of period | 55 |  |  | 88 |
Cash, cash equivalents and restricted cash of continuing operations | $ | 62,783 |  |  | $ | 157,303 |

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.
4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (CONTINUED)
(unaudited)

| Six Months Ended June 30,
| 2026 |  | 2025
| (in thousands)
Supplemental disclosure of cash flow information for continuing operations: |  |  |
Cash paid for interest | $ | 96 |  |  | $ | 381 |
Cash paid for income taxes, net of refunds received | $ | 819 |  |  | $ | 395 |
Supplemental disclosure of non-cash transactions for continuing operations: |  |  |
Purchases of property, plant and equipment included in accounts payable and accrued expenses | $ | 2,086 |  |  | $ | 151 |
Right-of-use assets obtained for finance lease liabilities | $ | 395 |  |  | $ | — |

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.
5

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
1. Organization and Nature of Business
Mammoth Energy Services, Inc. (“Mammoth” or the “Company”), together with its subsidiaries, is an integrated, growth-oriented company focused on providing products and services to our customers primarily in the oil and natural gas, aviation and utility infrastructure industries in North America. Mammoth’s suite of services includes rental services and aviation sales, infrastructure services, natural sand proppant services, accommodation services and drilling services. The Company’s rental services and aviation sales include a wide range of equipment used in oilfield, construction and aviation activities. The Company’s infrastructure services include providing fiber optic services to the utility infrastructure industry. The Company’s natural sand proppant services include mining, processing and selling natural sand proppant used for hydraulic fracturing. The Company’s accommodation services include housing, kitchen and dining, and recreational service facilities for workers located in remote areas away from readily available lodging. The Company’s drilling services include providing directional drilling to oilfield operators. The Company was incorporated in Delaware in June 2016.
On April 11, 2025, the Company completed a transaction to sell a portion of its infrastructure services entities, including its distribution, transmission and substation operations, for aggregate proceeds of $108.7 million. Subsequently, on June 16, 2025, the Company sold all of the equipment previously used in its hydraulic fracturing services for $15.0 million. In addition, on December 2, 2025, the Company completed a transaction to sell its engineering business for $30.0 million. These transactions reflect a strategic shift in the Company’s business. Results of operations, financial position and cash flows for these services are reported as discontinued operations for all periods presented and discussed in this report. Refer to Note 4 for further information.
2. Basis of Presentation and Significant Accounting Policies
Basis of Presentation
The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and its subsidiaries and the variable interest entities (“VIE”) for which the Company is the primary beneficiary. See Note 11 for additional information regarding these entities. All intercompany accounts and transactions have been eliminated.
This report has been prepared in accordance with the rules and regulations of the Securities and Exchange Commission, and reflects all adjustments, which in the opinion of management are necessary for the fair presentation of the results for the interim periods, on a basis consistent with the annual audited consolidated financial statements. All such adjustments are of a normal, recurring nature. Certain information, accounting policies and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles (“GAAP”) have been omitted pursuant to such rules and regulations, although the Company believes that the disclosures are adequate to make the information presented not misleading.
Unless otherwise indicated, information in these notes to unaudited condensed consolidated financial statements relates to continuing operations. Certain of our operations have been presented as discontinued. See Note 4 for further information.
These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and the summary of significant accounting policies and notes thereto included in the Company’s most recent Annual Report on Form 10-K for the year ended December 31, 2025.
Reclassifications
Certain prior period balances in the unaudited condensed consolidated balance sheets and notes to the unaudited condensed consolidated financial statements have been combined or reclassified to conform to current period presentation. There was no impact on previously reported total assets, total liabilities, net income (loss) or equity for the periods presented.
Cash, Cash Equivalents and Restricted Cash
All highly liquid investments with an original maturity of three months or less are considered cash equivalents. Restricted cash at June 30, 2026 and December 31, 2025 consisted of amounts held in escrow related to the sale of certain of our infrastructure subsidiaries as discussed in Note 4.
6

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
The following table provides a reconciliation of “cash and cash equivalents” and “restricted cash” reported on the unaudited condensed consolidated balance sheets that sum to the total of the same such amounts shown on the unaudited condensed consolidated statements of cash flows (in thousands):

|  | June 30, |  | December 31,
|  | 2026 |  | 2025
Cash and cash equivalents |  | $ | 50,869 |  |  | $ | 101,987 |
Restricted cash |  | 11,914 |  |  | 12,085 |
Total cash, cash equivalents and restricted cash shown in the unaudited condensed consolidated statements of cash flows |  | $ | 62,783 |  |  | $ | 114,072 |

Marketable Securities
The Company considers all of its marketable publicly held securities as available for use in current operations, and therefore classifies these securities within current assets on the unaudited condensed consolidated balance sheets. Equity securities are measured at fair value, with changes in fair value recognized within “(Loss) gain on marketable securities, net” on the unaudited condensed consolidated statements of operations and comprehensive income (loss).
Realized gains and losses on securities sold are determined using the specific identification method and are measured based on the last reported carrying value of the securities immediately preceding the date of sale. The following table presents the components of “(Loss) gain on marketable securities, net”:

| Three Months Ended June 30, |  | Six Months Ended June 30, |  |
| 2026 |  | 2025 |  | 2026 |  | 2025 |  |  |  |
(Loss) gain recognized on marketable securities, net | $ | (1,116) |  |  | $ | — |  |  | $ | 5,987 |  |  | $ | — |  |  |  |  |
Less: net gain recognized on marketable securities sold during the period | 75 |  |  | — |  |  | 75 |  |  | — |  |  |  |  |
Unrealized (loss) gain recognized on marketable securities still held at the reporting date | $ | (1,191) |  |  | $ | — |  |  | $ | 5,912 |  |  | $ | — |  |  |  |  |

Accounts Receivable, net
Accounts receivable include amounts due from customers for services performed or goods sold. The Company grants credit to customers in the ordinary course of business and generally does not require collateral. Prior to granting credit to customers, the Company analyzes the potential customer’s risk profile by utilizing a credit report, analyzing macroeconomic factors and using its knowledge of the industry, among other factors. Customer balances are generally considered delinquent if unpaid by the due date, which generally ranges from 30 to 60 days following the invoice date, and credit privileges may be revoked if balances remain unpaid. Interest on delinquent trade accounts receivable is recognized in “other (expense) income”, net on the unaudited condensed consolidated statements of operations and comprehensive income (loss) when chargeable and collectability is reasonably assured.
The Company regularly reviews receivables and provides for expected losses through an allowance for expected credit losses. In evaluating the level of established reserves, the Company makes judgments regarding its customers’ ability to make required payments, economic events and other factors. As the financial condition of customers changes, circumstances develop, or additional information becomes available, adjustments to the allowance for expected credit losses may be required. In the event the Company expects that a customer may not be able to make required payments, the Company would increase the allowance through a charge to income in the period in which that determination is made. If it is determined that previously reserved amounts are collectible, the Company would decrease the allowance through a credit to income in the period in which that determination is made. Uncollectible accounts receivable are periodically charged against the allowance for expected credit losses once a final determination is made regarding their collectability.
7

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
Following is a rollforward of the changes in our allowance for expected credit losses for the six months ended June 30, 2026 (in thousands):

Balance at December 31, 2025 |  | $ | 170,937 |
Change in provision for expected credit losses before recoveries |  | — |
Recoveries of receivables previously charged to credit loss expense |  | (4) |
Write-offs charged against the provision |  | — |
Balance at June 30, 2026 |  | $ | 170,933 |

The Company has made specific reserves consistent with Company policy which resulted in additions to the allowance for expected credit losses totaling $0.1 million for the six months ended June 30, 2025. There were no additions to the allowance for expected credit losses for the six months ended June 30, 2026. These additions were charged to credit loss expense, which is included in “selling, general and administrative” on the unaudited condensed consolidated statements of operations and comprehensive income (loss) based on the factors described above.
Substantially all of the allowance for expected credit losses relates to the receivable from the Puerto Rico Electric Power Authority (“PREPA”). Refer to the Company’s Annual Report on Form 10-K for the year ended December 31, 2025, previously filed with the SEC for more information regarding the Settlement Agreement.
PREPA
During the period October 2017 through March 2019, the Company provided infrastructure services in Puerto Rico under master services agreements entered into by Cobra Acquisitions LLC (“Cobra”), one of the Company’s subsidiaries, with the Puerto Rico Electric Power Authority (“PREPA”) to perform repairs to PREPA’s electrical grid as a result of Hurricane Maria. PREPA is currently subject to bankruptcy proceedings, which were filed in July 2017 and are currently pending in the United States District Court for the District of Puerto Rico (the “Title III Court”). On July 22, 2024, Cobra entered into a release and settlement agreement with PREPA and the Financial Oversight and Management Board for Puerto Rico (the “FOMB”), in its capacity as Title III representative for PREPA, to settle all outstanding matters between Cobra and PREPA (the “Settlement Agreement”). Pursuant to the terms of the Settlement Agreement, PREPA paid Cobra approximately $168.4 million in 2024 and, as of June 30, 2026, PREPA owes Cobra $20.0 million, which is payable within seven days following the effective date of PREPA’s plan of adjustment in its bankruptcy proceedings.
The Settlement Agreement will not be fully performed until PREPA remits the remaining $20.0 million payment.
Concentrations of Credit Risk and Significant Customers
Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash and cash equivalents in excess of federally insured limits, marketable securities and trade receivables. Following is a summary of our significant customers based on percentages of total accounts receivable, net balances at June 30, 2026 and December 31, 2025 and percentages of total revenue derived for the three and six months ended June 30, 2026 and 2025:

| REVENUE |  | ACCOUNTS RECEIVABLE, NET
| Three Months Ended June 30, |  | Six Months Ended June 30, |  | At June 30, | At December 31,
| 2026 | 2025 |  | 2026 | 2025 |  | 2026 | 2025
Customer A(a) | 18 | % | 9 | % |  | 12 | % | 5 | % |  | 1 | % | — | %
Customer B(b) | 11 | % | 3 | % |  | 9 | % | 1 | % |  | 6 | % | 1 | %
Customer C(c) | 6 | % | 1 | % |  | 19 | % | — | % |  | 3 | % | — | %
Customer D(c) | 8 | % | 13 | % |  | 6 | % | 12 | % |  | 6 | % | 2 | %
Customer E(a) | 3 | % | 26 | % |  | 6 | % | 25 | % |  | 2 | % | 4 | %
Customer F(d) | — | % | 11 | % |  | — | % | 9 | % |  | 5 | % | 6 | %
Customer G(e) | — | % | — | % |  | — | % | — | % |  | 51 | % | 69 | %

(a)Revenue and the related accounts receivable balances earned from Customer A and E were derived from the Company’s natural sand proppant services segment.
(b)Revenue and the related accounts receivable balances earned from Customer B were derived from the Company’s drilling services segment.
(c)Revenue and the related accounts receivable balances earned from Customer C and D were derived from the Company’s rental services segment.
(d)Revenue and the related accounts receivable balances earned from Customer F were derived from the Company’s infrastructure services segment.
(e)The accounts receivable balance with Customer G was derived from the Company’s other services.
8

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
Fair Value of Financial Instruments
Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs.
The fair value hierarchy is based on three levels of input, of which the first two are considered observable and the last unobservable, that may be used to measure fair value. A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurements in its entirety requires judgment and may affect the valuation of the assets and liabilities being measured and their placement within the fair value hierarchy. The Company uses appropriate valuation techniques based on available inputs to measure the fair values of its assets and liabilities.
Level 1 - Observable inputs that reflect unadjusted quoted prices for identical assets or liabilities in active markets as of the reporting date.
Level 2 - Observable market-based inputs or unobservable inputs that are corroborated by market data. These are inputs other than quoted prices in active markets included in Level 1, which are either directly or indirectly observable as of the reporting date.
Level 3 - Unobservable inputs that are not corroborated by market data and may be used with internally developed methodologies that result in management’s best estimate of fair value.
There were no transfers into, or out of, the three levels of fair value hierarchy for the three and six months ended June 30, 2026 and 2025.
The Company’s financial instruments consist of cash and cash equivalents, marketable securities, restricted cash, accounts receivable, accounts payable as well as financing and operating lease liabilities and financed insurance premium obligations. The carrying values of cash and cash equivalents, restricted cash, accounts receivable and accounts payable approximated fair value on June 30, 2026 and December 31, 2025 due to their short-term nature. The carrying values of amounts outstanding under financing and operating lease liabilities and financed insurance premium obligations approximated fair value on June 30, 2026 and December 31, 2025, as the effective borrowing rates approximated market rates.
Recurring Measurements
The fair value of the Company’s cash equivalents and marketable securities are measured on a recurring basis are carried at estimated fair value. Cash equivalents consist of money market accounts and U.S. treasury bills which the Company has classified as Level 1 given the active market for these assets. Marketable securities are presented and are also classified as Level 1 due to their quoted prices in active markets. At June 30, 2026 and December 31, 2025, the Company had cash equivalents and marketable securities measured at fair value of $70.5 million and $113.6 million, respectively.
Nonrecurring Measurements
The Company estimates fair value to perform impairment tests on long-lived assets including property, plant and equipment and goodwill. The inputs used to determine such fair value may be based on internally developed cash flow models or market appraisals, both of which would generally be classified within Level 3 in the event that such assets were required to be measured and recorded at fair value.
As discussed in Note 7, the Company changed the classification of its drilling rig assets from held for use to held for sale at March 31, 2025, which required the Company to estimate the fair value of such assets. Cash flow models or market appraisals used to determine such fair value may be based on inputs that are classified within Level 3. The Company determined that the fair value of its drilling rig assets exceeds the carrying value and, therefore, no impairment was recognized.
Common Stock Repurchases and Retirements
9

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
The Company accounts for repurchases of its common stock at the amount paid, including direct and incremental costs such as broker commissions. Shares repurchased under the Company’s stock repurchase program are cancelled and retired, with the par value charged to common stock and the excess of the repurchase price over par value recorded as a reduction of additional paid‑in capital.
New Accounting Pronouncements
In November 2024, the FASB issued ASU 2024-03, “Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses”, which requires disclosure of specified information about certain costs and expenses. ASU 2024-03 is effective for fiscal years beginning after December 15, 2026 and interim periods beginning after December 15, 2027, with early adoption permitted, and should be applied either on a prospective basis or retrospective basis. The Company is currently assessing the impact of this ASU on the Company’s unaudited condensed consolidated financial statements.
In December 2025, the FASB issued ASU No. 2025-11, Interim Reporting (Topic 270): Narrow-Scope Improvements (“ASU 2025-11”). The amendments clarify and reorganize existing interim reporting guidance, including the scope of Topic 270 and interim disclosure requirements, and introduce a disclosure principle requiring entities to disclose material events or changes occurring since the most recent annual reporting period. ASU 2025-11 is effective for interim reporting periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. The Company is currently evaluating the impact of ASU 2025-11 on its unaudited condensed consolidated financial statements and related disclosures.
Recently Adopted Accounting Pronouncements
In July 2025, the FASB issued ASU 2025-05, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets,” which provides a practical expedient for estimating expected credit losses for current accounts receivable and current contract assets arising from transactions accounted for under ASC 606. The practical expedient allows entities to assume that current conditions as of the balance sheet date remain unchanged over the remaining life of the asset. The Company adopted ASU 2025-05 on January 1, 2026 and elected to apply the practical expedient. Adoption did not have a material impact on the Company’s unaudited condensed consolidated financial statements.
10

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
3. Acquisitions
Acquisition of Mission Construction and BERE Rentals
On June 12, 2026, we acquired all of the outstanding equity interests in Mission Construction LLC (“Mission Construction”), and BERE Rentals LLC (“BERE Rentals”) pursuant to equity purchase agreements with unrelated third-party sellers for aggregate consideration of $6.5 million, funded with cash on hand, including a holdback payable of $0.7 million due within one year of closing and subject to reduction for valid indemnification claims arising from customary representations, warranties and covenants. Both Mission Construction and BERE Rentals provide fiber optic services to utility customers in the midwestern region of the United States. The acquisitions were accounted for as business combinations under ASC 805, Business Combinations, with the results of Mission Construction and BERE Rentals included in the Infrastructure Services segment of our consolidated financial statements from the acquisition date. The acquisitions were undertaken to expand our presence in the fiber optic services market, broaden our services to utility customers, and strengthen our position in the region.
The following table summarizes the fair value of Mission Construction and BERE Rentals as of June 12, 2026:

| Mission Construction | BERE Rentals | Total
Cash and cash equivalents | $ | 43 |  | $ | 59 |  | 102 |
Accounts receivable, net | 795 |  | 364 |  | 1,159 |
Other current assets | — |  | 1 |  | 1 |
Property, plant and equipment | 1,454 |  | 1,396 |  | 2,850 |
Identifiable intangible assets - customer relationships | 295 |  | 1,087 |  | 1,382 |
Identifiable intangible assets - trade names | 70 |  | 161 |  | 231 |
Goodwill | 986 |  | 476 |  | 1,462 |
Total assets acquired | $ | 3,643 |  | $ | 3,544 |  | $ | 7,187 |
Accounts payable and accrued liabilities | $ | 351 |  | $ | 26 |  | $ | 377 |
Other current liabilities | 192 |  | 119 |  | 311 |
Total liabilities assumed | $ | 543 |  | $ | 145 |  | $ | 688 |
Net assets acquired | $ | 3,100 |  | $ | 3,399 |  | $ | 6,499 |

The purchase price allocation presented above is preliminary and subject to change as additional information becomes available regarding the fair values of assets acquired and liabilities assumed during the measurement period. The acquired customer relationship and trade name intangible assets each have an estimated useful life of seven years.
4. Discontinued Operations
T&D Transaction
On April 11, 2025, Lion Power Services LLC (“Lion”), a subsidiary of the Company, entered into an Equity Interest Purchase Agreement (the “T&D Agreement”), as the seller, with Peak Utility Services Group, Inc. (“Peak”), 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 (“Higher Power”) and Python Equipment LLC (“Python”) (the “T&D Transaction”). These subsidiaries provided transmission, distribution and substation services and were previously included in the Company’s Infrastructure segment, as defined in Note 19. The T&D Transaction was completed simultaneously with the signing of the T&D Agreement on April 11, 2025. The aggregate sales price in connection with the T&D Transaction was approximately $108.7 million. Of the $108.7 million, $98.3 million was paid to Lion and the remaining $10.4 million was deposited into an escrow account, pursuant to the terms of the T&D Agreement. Of the $10.4 million deposited into an escrow account, $0.8 million has been received, leaving $9.6 million left in the restricted cash balance. The T&D Agreement includes customary representations, warranties and covenants by the parties. In addition, the T&D Agreement provides for customary indemnification rights with respect to a breach of a representation, warranty or covenant by either party, subject to customary thresholds and caps on liability.
Pressure Pumping Transaction
On June 16, 2025, Stingray Pressure Pumping LLC (“Stingray”) and Mammoth Equipment Leasing LLC (“Mammoth
11

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
Equipment”), subsidiaries of the Company, entered into an Equipment Purchase Agreement (the “Pressure Pumping 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 services, which was included in the Company’s historical well completion segment, to MGB for $15.0 million (the “Pressure Pumping Transaction” and collectively with the T&D Transaction, the “Transactions”). The Pressure Pumping Transaction was completed simultaneously with the signing of the Pressure Pumping Agreement on June 16, 2025. In conjunction with the Pressure Pumping Transaction, the Company has ceased operations of its sand hauling and equipment manufacturing services, which operations primarily served Stingray and Mammoth Equipment. All assets and liabilities associated with the Company’s sand hauling and equipment manufacturing services are included in discontinued operations.
Engineering Transaction
On December 2, 2025, Mammoth Energy Partners LLC ("MEP"), a subsidiary of 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 interests in Aquawolf, which was included in the Company’s Infrastructure segment, to Qualus for $30.0 million (the “Engineering Transaction” and collectively with the Pressure Pumping Transaction and T&D Transaction, the “Transactions”)). The Engineering Transaction was completed simultaneously with the signing of the Agreement on December 2, 2025. The aggregate sales price in connection with the Transaction was approximately $30.0 million. Of the $30.0 million, $23.5 million was paid to MEP and $2.5 million was deposited into an escrow account, pursuant to the terms of the Agreement. Of the $2.5 million deposited into an escrow account, $0.2 million has been received, leaving $2.3 million left in the restricted cash balance. The Agreement includes customary representations, warranties and covenants by the parties. In addition, the Agreement provides for customary indemnification rights with respect to a breach of a representation, warranty or covenant by either party, subject to customary thresholds and caps on liability.
The Transactions and ceasing operations of the Company’s sand hauling and equipment manufacturing services reflect a strategic shift in the Company’s business. Therefore, the results of operations and cash flows of the services discussed above are classified as discontinued operations in the Company’s unaudited condensed consolidated statements of operations and comprehensive income (loss) and unaudited condensed consolidated statements of cash flows for all periods presented. The related assets and liabilities associated with the discontinued operations are included in the financial statement line items labeled discontinued operations in the unaudited condensed consolidated balance sheets as of June 30, 2026 and December 31, 2025. Amounts presented in discontinued operations have been derived from our consolidated financial statements and accounting records using the historical basis of assets, liabilities, results of operations and cash flows of the services discussed above. The discontinued operations exclude general corporate allocations.
12

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
The following table presents the major classes of assets and liabilities of discontinued operations (in thousands):

| T&D Transaction |  | Pressure Pumping Transaction |  | Engineering Transaction
| June 30, |  | December 31, |  | June 30, |  | December 31, |  | June 30, |  | December 31,
| 2026 |  | 2025 |  | 2026 |  | 2025 |  | 2026 |  | 2025
Carrying amounts of the major classes of assets included in discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 55 |  |  | $ | 50 |  |  | $ | — |  |  | $ | — |
Accounts receivable, net | — |  |  | — |  |  | 1,003 |  |  | 1,036 |  |  | — |  |  | — |
Inventories | — |  |  | — |  |  | 264 |  |  | 264 |  |  | — |  |  | — |
Other current assets | — |  |  | — |  |  | 12 |  |  | 168 |  |  | — |  |  | — |
Total current assets of discontinued operations | — |  |  | — |  |  | 1,334 |  |  | 1,518 |  |  | — |  |  | — |
Property, plant and equipment, net | — |  |  | — |  |  | 6 |  |  | 3,678 |  |  | — |  |  | — |
Total noncurrent assets of discontinued operations | — |  |  | — |  |  | 6 |  |  | 3,678 |  |  | — |  |  | — |
Total assets of discontinued operations | $ | — |  |  | $ | — |  |  | $ | 1,340 |  |  | $ | 5,196 |  |  | $ | — |  |  | $ | — |
Carrying amounts of the major classes of liabilities included in discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Accounts payable | $ | — |  |  | $ | — |  |  | $ | 76 |  |  | $ | 41 |  |  | $ | — |  |  | $ | — |
Accrued expenses and other current liabilities | — |  |  | — |  |  | 222 |  |  | 342 |  |  | — |  |  | — |
Total current liabilities of discontinued operations | — |  |  | — |  |  | 298 |  |  | 383 |  |  | — |  |  | — |
Total liabilities of discontinued operations | $ | — |  |  | $ | — |  |  | $ | 298 |  |  | $ | 383 |  |  | $ | — |  |  | $ | — |

13

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
The following tables present the major components from discontinued operations in the Company’s unaudited condensed consolidated statements of operations and comprehensive income (loss) (in thousands):

| T&D Transaction |  | Pressure Pumping Transaction |  | Engineering Transaction
| Three Months Ended June 30, |  | Three Months Ended June 30, |  | Three Months Ended June 30,
| 2026 |  | 2025 |  | 2026 |  | 2025 |  | 2026 |  | 2025
Services revenue | $ | — |  |  | $ | 3,502 |  |  | $ | — |  |  | $ | 20,887 |  |  | $ | — |  |  | $ | 4,055 |
COST, EXPENSES AND GAINS |  |  |  |  |  |  |  |  |  |  |
Cost of revenue | (15) |  |  | 3,831 |  |  | (488) |  |  | 20,660 |  |  | — |  |  | 2,942 |
Selling, general and administrative | 25 |  |  | 374 |  |  | 7 |  |  | 666 |  |  | — |  |  | 382 |
Depreciation and amortization | — |  |  | 96 |  |  | — |  |  | 2,614 |  |  | — |  |  | 6 |
Gains on disposal of assets, net | — |  |  | 146 |  |  | — |  |  | (256) |  |  | — |  |  | — |
Impairment of goodwill | — |  |  | — |  |  | — |  |  | 9,214 |  |  | — |  |  | — |
Total cost, expenses and gains, net | 10 |  |  | 4,447 |  |  | (481) |  |  | 32,898 |  |  | — |  |  | 3,330 |
Operating (loss) income | (10) |  |  | (945) |  |  | 481 |  |  | (12,011) |  |  | — |  |  | 725 |
OTHER (INCOME) EXPENSE |  |  |  |  |  |  |  |  |  |  |
Interest expense (income), net | — |  |  | 3 |  |  | 6 |  |  | (368) |  |  | — |  |  | (107) |
Other (income) expense, net | — |  |  | (127) |  |  | — |  |  | 2 |  |  | — |  |  | 1 |
(Gain) loss on divestiture | — |  |  | (83,747) |  |  | — |  |  | 24,974 |  |  | 27 |  |  | — |
Total other expense (income), net | — |  |  | (83,871) |  |  | 6 |  |  | 24,608 |  |  | 27 |  |  | (106) |
(Loss) income before income taxes | (10) |  |  | 82,926 |  |  | 475 |  |  | (36,619) |  |  | (27) |  |  | 831 |
Provision (benefit) for income taxes | — |  |  | 3,028 |  |  | — |  |  | (1,262) |  |  | — |  |  | 1 |
Net (loss) income from discontinued operations, net of income taxes | $ | (10) |  |  | $ | 79,898 |  |  | $ | 475 |  |  | $ | (35,357) |  |  | $ | (27) |  |  | $ | 830 |

14

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

| T&D Transaction |  | Pressure Pumping Transaction |  | Engineering Transaction
| Six Months Ended June 30, |  | Six Months Ended June 30, |  | Six Months Ended June 30,
| 2026 |  | 2025 |  | 2026 |  | 2025 |  | 2026 |  | 2025
Services revenue | $ | — |  |  | $ | 29,553 |  |  | $ | — |  |  | $ | 41,709 |  |  | $ | — |  |  | $ | 8,018 |
COST, EXPENSES AND GAINS |  |  |  |  |  |  |  |  |  |  |
Cost of revenue | (14) |  |  | 25,378 |  |  | (299) |  |  | 39,507 |  |  | — |  |  | 5,874 |
Selling, general and administrative | 77 |  |  | 1,846 |  |  | 70 |  |  | 1,242 |  |  | — |  |  | 759 |
Depreciation and amortization | — |  |  | 957 |  |  | 3 |  |  | 5,704 |  |  | — |  |  | 13 |
Gains on disposal of assets, net | — |  |  | (20) |  |  | (855) |  |  | (637) |  |  | — |  |  | — |
Impairment of goodwill | — |  |  | — |  |  | — |  |  | 9,214 |  |  | — |  |  | — |
Total cost, expenses and gains, net | 63 |  |  | 28,161 |  |  | (1,081) |  |  | 55,030 |  |  | — |  |  | 6,646 |
Operating (loss) income | (63) |  |  | 1,392 |  |  | 1,081 |  |  | (13,321) |  |  | — |  |  | 1,372 |
OTHER (INCOME) EXPENSE |  |  |  |  |  |  |  |  |  |  |
Interest expense (income), net | — |  |  | 59 |  |  | 50 |  |  | (465) |  |  | — |  |  | (130) |
Other (income) expense, net | — |  |  | (122) |  |  | 1 |  |  | 3 |  |  | — |  |  | 1 |
(Gain) loss on divestiture | — |  |  | (83,747) |  |  | — |  |  | 24,974 |  |  | 27 |  |  | — |
Total other expense (income), net | — |  |  | (83,810) |  |  | 51 |  |  | 24,512 |  |  | 27 |  |  | (129) |
(Loss) income before income taxes | (63) |  |  | 85,202 |  |  | 1,030 |  |  | (37,833) |  |  | (27) |  |  | 1,501 |
Provision (benefit) for income taxes | — |  |  | 3,050 |  |  | — |  |  | (1,262) |  |  | — |  |  | 1 |
Net (loss) income from discontinued operations, net of income taxes | $ | (63) |  |  | $ | 82,152 |  |  | $ | 1,030 |  |  | $ | (36,571) |  |  | $ | (27) |  |  | $ | 1,500 |

15

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
5. Revenue from Contracts with Customers
The Company’s primary revenue streams include rental services and aviation sales, infrastructure services, natural sand proppant services, accommodation services and drilling services. See Note 19 for the Company’s revenue disaggregated by type.
Certain of the Company’s customer contracts include provisions entitling the Company to a termination penalty when the customer invokes its contractual right to terminate prior to the contract’s nominal end date. The termination penalties in the customer contracts vary, but are generally considered substantive for accounting purposes and create enforceable rights and obligations throughout the stated duration of the contract. The Company accounts for a contract cancellation as a contract modification in the period in which the customer invokes the termination provision. The determination of the contract termination penalty is based on the terms stated in the related customer agreement. As of the modification date, the Company updates its estimate of the transaction price using the expected value method, subject to constraints, and recognizes the amount over the remaining performance period.
Rental, Accommodation and Drilling Services
Rental services, accommodation services and drilling services are generally provided pursuant to purchase orders, master service agreements, customer contracts or on a spot market basis. Services are typically billed on a day rate, hourly, contract or utilization basis. Performance obligations for these services are satisfied over time and revenue is recognized as services are performed using an appropriate measure of output. Contract durations are generally short-term in nature and may range from a single day to several months.
In addition, the Company generates revenue from aviation leasing and aviation sales. Revenue from aviation leases is recognized in accordance with the contractual terms. Revenue from aviation equipment sales is recognized at the point in time when control of the equipment transfers to the customer, generally upon delivery. Revenue from aviation leasing and other rental services is included in “services revenue”, while revenue from aviation sales is included in “product revenue” on the unaudited condensed consolidated statements of operations and comprehensive income (loss). The cost of aviation equipment sold is included in “product cost of revenue”. The proceeds from sale of aviation equipment are included in investing activities in the unaudited condensed consolidated statements of cash flows.
Infrastructure Services
Infrastructure services are typically provided pursuant to master service agreements, repair and maintenance contracts or fixed price and non-fixed price installation contracts. Pricing under these contracts may be unit priced, cost-plus/hourly (or time and materials basis) or fixed price (or lump sum basis). Generally, the Company accounts for infrastructure services as a single performance obligation satisfied over time. In certain circumstances, the Company supplies materials that are utilized during the jobs as part of the agreement with the customer. The Company accounts for these infrastructure agreements as multiple performance obligations satisfied over time. Revenue is recognized over time as work progresses based on progress toward completion utilizing an appropriate measure of output. Under certain customer contracts in our infrastructure services segment, the Company warranties equipment and labor performed for a specified period following substantial completion of the work.
Natural Sand Proppant Services
The Company sells natural sand proppant through sand supply agreements with its customers. Under these agreements, sand is typically sold at a flat rate per ton or a flat rate per ton with an index-based adjustment. The Company recognizes revenue at the point in time when the customer obtains legal title to the product, which may occur at the production facility, rail origin or at the destination terminal.
Certain of the Company’s sand supply agreements contained a minimum volume commitment related to sand purchases whereby the Company charges a shortfall payment if the customer fails to meet the required minimum volume commitment. These agreements may also contain make-up provisions whereby shortfall payments can be applied in future periods against purchased volumes exceeding the minimum volume commitment. If a make-up right exists, the Company has future performance obligations to deliver excess volumes of product in subsequent months. In accordance with ASC 606, if the customer fails to meet the minimum volume commitment, the Company will assess whether it expects the customer to fulfill its unmet commitment during the contractually specified make-up period based on discussions with the customer and management’s knowledge of the business. If the Company expects the customer will make-up deficient volumes in future periods, revenue related to shortfall payments will be deferred and recognized on the earlier of the date on which the customer utilizes make-up volumes or the likelihood that the customer will exercise its right to make-up deficient volumes becomes remote. If the Company does not expect the customer will make-up deficient volumes in
16

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
future periods, the breakage model will be applied and revenue related to shortfall payments will be recognized when the model indicates the customer’s inability to take delivery of excess volumes. The Company did not recognize any shortfall revenue during the three and six months ended June 30, 2026. The Company recognized shortfall revenue totaling $1.6 million during the six months ended June 30, 2025.
In certain of the Company’s sand supply agreements, the customer obtains control of the product when it is loaded into rail cars and the customer reimburses the Company for all freight charges incurred. The Company has elected to account for shipping and handling as activities to fulfill the promise to transfer the sand. If revenue is recognized for the related product before the shipping and handling activities occur, the Company recognizes the related costs of those shipping and handling activities.
Practical Expedients
The Company does not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts in which variable consideration is allocated entirely to a wholly unsatisfied performance obligation or to a wholly unsatisfied distinct good or service that forms part of a single performance obligation.
Contract Balances
Following is a rollforward of the Company’s contract liabilities, which are included in “accrued expenses and other current liabilities” on the unaudited condensed consolidated balance sheets (in thousands):

Balance at December 31, 2025 |  | $ | 1,357 |
Revenue recognized from beginning contract liability balance |  | (111) |
Increase for deferral of customer prepayments |  | 2,336 |
Balance at June 30, 2026 |  | $ | 3,582 |

The Company did not have any contract assets at June 30, 2026 and December 31, 2025.
Performance Obligations
Revenue recognized in the current period from performance obligations satisfied in previous periods was immaterial for the three and six months ended June 30, 2026 and 2025. At June 30, 2026, the Company had unsatisfied performance obligations totaling $2.9 million, which will be recognized over the next 7 months.
6. Inventories
Inventories consist of raw sand, processed sand and parts available for sale and supplies used in performing services, as well as aviation equipment being repaired for their intended use. Inventory is stated at the lower of cost or net realizable value on an average cost basis. The Company assesses the valuation of its inventories based upon specific usage, future utility, obsolescence and other factors. A summary of the Company’s inventories is shown below (in thousands):

|  | June 30, |  | December 31,
|  | 2026 |  | 2025
Supplies |  | $ | 1,365 |  |  | $ | 1,913 |
Work in process |  | 9,543 |  |  | 1,482 |
Finished goods |  | 135 |  |  | 688 |
Total inventories |  | $ | 11,043 |  |  | $ | 4,083 |

17

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
7. Property, Plant and Equipment, net and Assets Held for Sale
Property, plant and equipment, net includes the following (in thousands):

|  |  | June 30, |  | December 31,
| Useful Life |  | 2026 |  | 2025
Aviation equipment(a) | 3-10 years |  | $ | 75,509 |  |  | $ | 43,498 |
Machinery and equipment | 7-20 years |  | 70,307 |  |  | 53,774 |
Buildings and leasehold improvements | 15-39 years |  | 29,806 |  |  | 30,100 |
Drilling rigs and directional drilling equipment | 3-15 years |  | 12,758 |  |  | 13,062 |
Rail improvements | 10-20 years |  | 11,759 |  |  | 11,759 |
Vehicles, trucks and trailers | 5-10 years |  | 11,372 |  |  | 13,044 |
Land | N/A |  | 6,025 |  |  | 6,025 |
Other property, plant and equipment | 3-15 years |  | 6,412 |  |  | 6,721 |
|  |  | 223,948 |  |  | 177,983 |
Equipment not yet placed in service |  |  | 27,811 |  |  | 25,970 |
|  |  | 251,759 |  |  | 203,953 |
Less: Accumulated depreciation(b) |  |  | 101,850 |  |  | 97,856 |
Total property, plant and equipment, net |  |  | $ | 149,909 |  |  | $ | 106,097 |

(a) This equipment relates to assets leased and available to be leased to customers under operating leases.
(b) Includes accumulated depreciation of $10.6 million and $5.7 million at June 30, 2026 and December 31, 2025, respectively, related to assets under operating leases.
Depreciation, depletion, amortization and accretion
A summary of depreciation, depletion, amortization and accretion is below (in thousands):

| Three Months Ended June 30, |  | Six Months Ended June 30, |  |
| 2026 |  | 2025 |  | 2026 |  | 2025 |  |  |  |
Depreciation | $ | 4,352 |  |  | $ | 2,233 |  |  | $ | 7,783 |  |  | $ | 4,269 |  |  |  |  |
Amortization | 14 |  |  | 14 |  |  | 28 |  |  | 27 |  |  |  |  |
Depletion and accretion | 268 |  |  | 580 |  |  | 293 |  |  | 614 |  |  |  |  |
Depreciation, depletion, amortization and accretion | $ | 4,634 |  |  | $ | 2,827 |  |  | $ | 8,104 |  |  | $ | 4,910 |  |  |  |  |

Assets Held for Sale
The Company’s assets held for sale consist solely of its contract drilling assets, which were classified as held for sale during the first quarter of 2025 pursuant to a plan to divest these assets. The Company continues to actively market the assets at a price that is reasonable in relation to their current fair value and remains committed to its plan of sale. At June 30, 2026 and December 31, 2025, assets held for sale totaled $2.2 million and $4.3 million and were recorded in “current assets held for sale” on the unaudited condensed consolidated balance sheets. These assets are measured at the lower of their carrying amount or fair value less costs to sell, and no impairment was recognized during the three and six months ended June 30, 2026.
8. Equity Method Investment
On December 21, 2018, Cobra Aviation Services LLC (“Cobra Aviation”) and Wexford Partners Investment Co. LLC (“Wexford Investment”), a related party, formed a joint venture under the name of Brim Acquisitions LLC (“Brim Acquisitions”) to acquire all outstanding equity interest in Brim Equipment Leasing, Inc. (“Brim Equipment”) for a total purchase price of approximately $2.0 million. Cobra Aviation owns a 49% economic interest and Wexford Investment owns a 51% economic interest in Brim Acquisitions, and each member contributed its pro rata portion of Brim Acquisitions’ initial capital of $2.0 million. Brim Acquisitions, through Brim Equipment, owns three commercial helicopters and leases two commercial helicopters for operations, which it uses to provide a variety of services, including short haul, aerial ignition, hoist operations, aerial photography, fire suppression, construction services, animal/capture/survey, search and rescue, airborne law enforcement, power line construction, precision long line operations, pipeline construction and survey, mineral and seismic exploration, and aerial seeding and fertilization.
18

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
The Company uses the equity method of accounting to account for its investment in Brim Acquisitions, which had a carrying value of approximately $2.9 million and $3.2 million at June 30, 2026 and December 31, 2025, respectively. The investment is included in “other non-current assets” on the unaudited condensed consolidated balance sheets. The Company recorded equity method income (loss) to its investment of $0.2 million and ($0.3) million for the three and six months ended June 30, 2026, respectively, and equity method income of $0.4 million and $0.3 million for the three and six months ended June 30, 2025, respectively, which is included in “other income (expense), net” on the unaudited condensed consolidated statements of operations and comprehensive income (loss). The investment in Brim Acquisitions is included in the Company’s Rentals segment, as defined in Note 19. The Company made additional equity contributions of $0.4 million during the year ended December 31, 2025 and no contributions were made during the six months ended June 30, 2026.
9. Accrued Expenses and Other Current Liabilities
Accrued expenses and other current liabilities included the following (in thousands):

|  | June 30, |  | December 31,
|  | 2026 |  | 2025
State and local taxes payable |  | $ | 12,567 |  |  | $ | 12,332 |
Deferred revenue |  | 3,582 |  |  | 1,357 |
Financed insurance premiums(a) |  | 601 |  |  | 1,936 |
Accrued compensation and benefits |  | 598 |  |  | 821 |
Insurance reserves |  | 563 |  |  | 1,166 |
Other |  | 1,964 |  |  | 724 |
Total accrued expenses and other current liabilities |  | $ | 19,875 |  |  | $ | 18,336 |

(a)Financed insurance premiums are due in monthly installments, are unsecured and mature within the twelve-month period following the close of the year. At June 30, 2026 the applicable interest rate associated with financed insurance premiums was 5.49%. At December 31, 2025, the applicable interest rate associated with financed insurance premiums ranged from 5.49% to 6.49%.
10. Debt
Revolving Credit Facility
On May 8, 2026, the Company entered into a new $25.0 million revolving credit agreement with Fifth Third Bank, National Association (the “new revolving credit facility”) and terminated its prior revolving credit facility, dated October 16, 2023, as amended (the “prior revolving credit facility”). The new revolving credit facility matures on May 8, 2029 and may be increased to up to $50.0 million at the Company’s request, subject to the lender’s sole discretion. Borrowings bear interest at one-month Term SOFR plus 1.50% per annum, and the Company pays a 0.20% per annum fee on the unused commitments. The facility is secured by a first-priority lien on cash and investment securities held in a collateral account maintained with the lender, the value of which, after applying specified advance rates, must equal at least 100% of outstanding borrowings and letter of credit obligations. The new revolving credit facility is not guaranteed by the Company’s subsidiaries and does not contain a financial maintenance covenant based on the Company’s operating results or any restriction on the payment of dividends or the repurchase of the Company’s common stock. In connection with the termination of the prior revolving credit facility, the Company wrote off $1.2 million of unamortized debt issuance costs during the three months ended June 30, 2026.
At June 30, 2026, the new revolving credit facility was undrawn and there was $20.0 million of borrowing capacity under the facility, after giving effect to $5.0 million of outstanding letters of credit deemed issued thereunder. At December 31, 2025, the prior revolving credit facility was undrawn and there was $36.7 million of borrowing capacity under that facility, after giving effect to $5.0 million of outstanding letters of credit. The Company was in compliance with all covenants under the new revolving credit facility at June 30, 2026.
19

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
11. Variable Interest Entities
Dire Wolf Energy Services LLC (“Dire Wolf”) and Predator Aviation LLC (“Predator Aviation”), wholly owned subsidiaries of the Company, are party to Voting Trust Agreements with TVPX Aircraft Solutions Inc. (the “Voting Trustee”). Under the Voting Trust Agreements, Dire Wolf transferred 100% of its membership interest in Cobra Aviation and Predator Aviation transferred 100% of its membership interest in Leopard Aviation LLC (“Leopard”) to the respective Voting Trustees in exchange for Voting Trust Certificates. Dire Wolf and Predator Aviation retained the obligation to absorb all expected returns or losses of Cobra Aviation and Leopard. Prior to the transfer of the membership interest to the Voting Trustee, Cobra Aviation was a wholly owned subsidiary of Dire Wolf and Leopard was a wholly owned subsidiary of Predator Aviation. Cobra Aviation owns aviation equipment, including eight aircraft that are owned through individual trusts that are each structured as separate legal entities, and 49% of the equity interest in Brim Acquisitions. Leopard owns aviation equipment. Dire Wolf and Predator Aviation entered into the Voting Trust Agreements in order to meet certain registration requirements.
Dire Wolf’s and Predator Aviation’s voting rights are not proportional to their respective obligations to absorb expected returns or losses of Cobra Aviation and Leopard, respectively, and all of Cobra Aviation’s and Leopard’s activities are conducted on behalf of Dire Wolf and Predator Aviation, which have disproportionately fewer voting rights; therefore, Cobra Aviation and Leopard meet the criteria of a VIE. Cobra Aviation and Leopard’s operational activities are directed by Dire Wolf’s and Predator Aviation’s officers and Dire Wolf and Predator Aviation have the option to terminate the Voting Trust Agreements at any time. Therefore, the Company, through Dire Wolf and Predator Aviation, is considered the primary beneficiary of the VIEs and consolidates Cobra Aviation and Leopard at June 30, 2026.
12. Income Taxes
The Company recorded income tax expense from continuing operations of $3.3 million for the six months ended June 30, 2026 compared to income tax benefit of $0.1 million for the six months ended June 30, 2025. The Company’s effective tax rates were 48.7% and 0.2% for the six months ended June 30, 2026 and 2025, respectively.
The effective tax rate for the six months ended June 30, 2026 differed from the statutory rate of 21% primarily due to changes in the valuation allowance and interest and penalties recognized during the period. The effective tax rate for the six months ended June 30, 2025 differed from the statutory rate of 21% primarily due to changes in the valuation allowance and interest and penalties recognized during the period.
On July 4, 2025, the One Big Beautiful Bill Act (the “OBBBA”) was enacted in the United States. The legislation made several changes to U.S. federal income tax law, including provisions allowing 100% bonus depreciation for certain qualifying depreciable property acquired and placed in service after January 19, 2025, and changes to the business interest expense limitation under Section 163(j) for tax years beginning after December 31, 2024. The Company considered the impact of these provisions to estimate its income tax provision for the six months ended June 30, 2026, including the expected impact on future cash taxes.
13. Leases
Lessee Accounting
The Company recognizes a lease liability equal to the present value of the lease payments and an operating lease right-of-use asset representing its right to use the underlying asset for the lease term for all leases with a term in excess of 12 months. For operating leases, lease expense for lease payments is recognized on a straight-line basis over the lease term, while finance leases include both an operating expense and an interest expense component. For all leases with a term of 12 months or less, the Company has elected the practical expedient to not recognize lease assets and liabilities and recognizes lease expense for these short-term leases on a straight-line basis over the lease term.
The Company’s operating leases are primarily for rail cars, real estate, and equipment and its finance leases are primarily for vehicles and equipment. Generally, the Company does not include renewal or termination options in its assessment of the leases unless extension or termination of certain assets is deemed to be reasonably certain. The accounting for some of the Company’s leases may require significant judgment, which includes determining whether a contract contains a lease, determining the incremental borrowing rates to utilize in the net present value calculation of lease payments for lease agreements which do not provide an implicit rate and assessing the likelihood of renewal or termination options. Lease agreements that contain a lease and non-lease component are generally accounted for as a single lease component.
20

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
The rate implicit in the Company’s leases is not readily determinable. Therefore, the Company uses its incremental borrowing rate based on information available at the commencement date of its leases in determining the present value of lease payments. The Company’s incremental borrowing rate reflects the estimated rate of interest that it would pay to borrow on a collateralized basis over a similar term an amount equal to the lease payments in a similar economic environment.
Lease expense consisted of the following for the three and six months ended June 30, 2026 and 2025 (in thousands):

| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2026 |  | 2025 |  | 2026 |  | 2025
Operating lease expense | $ | 564 |  |  | $ | 1,256 |  |  | $ | 1,187 |  |  | $ | 2,656 |
Short-term lease expense | 198 |  |  | — |  |  | 420 |  |  | — |
Finance lease expense: |  |  |  |  |  |  |
Amortization of right-of-use assets | 19 |  |  | 35 |  |  | 25 |  |  | 70 |
Interest on lease liabilities | 7 |  |  | 4 |  |  | 8 |  |  | 9 |
Total lease expense | $ | 788 |  |  | $ | 1,295 |  |  | $ | 1,640 |  |  | $ | 2,735 |

Right-of-use assets and liabilities related to finance leases are recorded in the following line items on the unaudited condensed consolidated balance sheets at June 30, 2026 and December 31, 2025 (in thousands):

| June 30, |  | December 31,
| 2026 |  | 2025
Property, plant and equipment, net | $ | 473 |  |  | $ | 102 |
Accrued expenses and other current liabilities | 109 |  |  | 49 |
Other liabilities | 324 |  |  | 26 |

Other supplemental information related to leases for the three and six months ended June 30, 2026 and 2025 and at June 30, 2026 and December 31, 2025 is as follows (in thousands):

| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2026 |  | 2025 |  | 2026 |  | 2025
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |  |
Operating cash flows from operating leases | $ | 729 |  |  | $ | 1,254 |  |  | $ | 1,584 |  |  | $ | 2,670 |
Operating cash flows from finance leases | 7 |  |  | 4 |  |  | 8 |  |  | 9 |
Financing cash flows from finance leases | 23 |  |  | 70 |  |  | 33 |  |  | 138 |
Right-of-use assets obtained in exchange for lease liabilities: |  |  |  |  |  |  |
Operating leases | $ | 1,949 |  |  | $ | 2,231 |  |  | $ | 1,973 |  |  | $ | 2,492 |
Finance leases | 420 |  |  | — |  |  | 395 |  |  | — |

| June 30, |  | December 31,
| 2026 |  | 2025
Weighted-average remaining lease term: |  |  |
Operating leases | 3.3 years |  | 3.5 years
Finance leases | 2.5 years |  | 1.5 years
Weighted-average discount rate: |  |  |
Operating leases | 9.4 | % |  | 9.8 | %
Finance leases | 8.8 | % |  | 10.1 | %

21

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
Maturities of lease liabilities at June 30, 2026 are as follows (in thousands):

| Operating Leases |  | Finance Leases
Remainder of 2026 | $ | 1,450 |  |  | $ | 71 |
2027 | 2,036 |  |  | 146 |
2028 | 546 |  |  | 88 |
2029 | 52 |  |  | 196 |
2030 | 52 |  |  | — |
Thereafter | 537 |  |  | — |
Total lease payments | 4,673 |  |  | 501 |
Less: Present value discount | 697 |  |  | 68 |
Present value of lease payments | $ | 3,976 |  |  | $ | 433 |

Lessor Accounting
Certain rental and accommodation service arrangements contain lease components under ASC 842. The Company has elected the practical expedient to combine the lease and non-lease components when permitted. Revenue from these arrangements is generally recognized over time based on the contractual rental period. The Company recognized lease revenue of $5.0 million and $8.9 million during the three and six months ended June 30, 2026, respectively, and $1.0 million and $1.2 million during the three and six months ended June 30, 2025, respectively, which is included in “services revenue” and “services revenue - related parties” on the unaudited condensed consolidated statements of operations and comprehensive income (loss).
Maturities of lease payments for the Company’s outstanding long-term leases at June 30, 2026 are as follows (in thousands):

Remainder of 2026 | $ | 6,270 |  |  |
2027 | 7,998 |  |  |
2028 | 6,212 |  |  |
2029 | 2,638 |  |  |
2030 | 1,315 |  |  |
Thereafter | 140 |  |  |
Total lease payments | $ | 24,573 |  |  |

22

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
14. Earnings Per Share
Reconciliations of the components of basic and diluted net earnings per share are presented in the table below (in thousands, except per share data):

| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2026 |  | 2025 |  | 2026 |  | 2025
Basic and diluted earnings per share: |  |  |  |  |  |  |
Net (loss) income from continuing operations | $ | (1,198) |  |  | $ | (36,523) |  |  | $ | 3,487 |  |  | $ | (38,770) |
Net income from discontinued operations, net of income taxes | 438 |  |  | 45,371 |  |  | 940 |  |  | 47,081 |
Net (loss) income | $ | (760) |  |  | $ | 8,848 |  |  | $ | 4,427 |  |  | $ | 8,311 |
Weighted average common shares outstanding(a) | 48,164 |  |  | 48,225 |  |  | 48,247 |  |  | 48,188 |
Basic and diluted (loss) earnings per share from continuing operations | $ | (0.02) |  |  | $ | (0.76) |  |  | $ | 0.07 |  |  | $ | (0.80) |
Basic and diluted earnings per share from discontinued operations | 0.01 |  |  | 0.94 |  |  | 0.02 |  |  | 0.98 |
Basic and diluted (loss) earnings per share | $ | (0.01) |  |  | $ | 0.18 |  |  | $ | 0.09 |  |  | $ | 0.18 |

(a) Excludes 94 and 93 shares for the three and six months ended June 30, 2025 of potentially dilutive restricted stock awards as their effect was antidilutive under the treasury stock method.
15. Equity Based Compensation
During June 2026, all outstanding Specified Member and Non-Employee Member awards were settled through the transfer of shares of Mammoth common stock by the majority equity holder of MEH Sub. As a result, all rights under the awards were cancelled and extinguished. The Company recognized equity based compensation expense of approximately $0.5 million during the three and six months ended June 30, 2026, with a corresponding capital contribution recorded in equity. No unrecognized compensation cost remained as of June 30, 2026.
16. Stock Based Compensation
On April 29, 2024, the board of directors of Mammoth adopted the Mammoth Energy Services, Inc. 2024 Equity Incentive Plan (the “2024 Plan”). The 2024 Plan authorizes the Company’s board of directors or the compensation committee of the Company’s board of directors to grant restricted stock, restricted stock units, stock appreciation rights, stock options and performance awards. There are a maximum of 1.9 million shares of common stock reserved for issuance under the 2024 Plan, of which 1.9 million shares of common stock remain available for future grants under the 2024 Plan at June 30, 2026.
Restricted Stock Units
The fair value of restricted stock unit awards was determined based on the fair market value of the Company’s common stock on the date of the grant. This value is amortized over the vesting period. At June 30, 2026, there was no unrecognized compensation cost. No shares vested during the three and six months ended June 30, 2026. The total fair value of shares vested was $0.5 million and $0.6 million during the three and six months ended June 30, 2025, respectively. Included in “selling, general and administrative” on the unaudited condensed consolidated statements of operations and comprehensive income (loss) is stock based compensation expense of $0.2 million and $0.4 million for the three and six months ended June 30, 2025, respectively.
23

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
17. Related Party Transactions
Transactions between the subsidiaries of the Company and the following companies are included in related party transactions: Wexford, El Toro Resources LLC, Caliber Investment Group LLC, Grizzly Oil Sands ULC, Brim Equipment and Executive Express Aviation LLC. The Company provides accommodations services to Grizzly Oil Sands ULC and engages in aircraft leasing arrangements with Brim Equipment. Revenue from related party transactions was $0.2 million and $0.7 million for the three and six months ended June 30, 2026, respectively, and $0.6 million and $0.7 million for the three and six months ended June 30, 2025, respectively. Costs incurred from related party transactions was $0.1 million and $0.2 million for the three and six months ended June 30, 2025, respectively. At June 30, 2026 and December 31, 2025, accounts receivable from related party transactions was $0.4 million and $0.4 million, which is included in “accounts receivable, net” on the unaudited condensed consolidated balance sheets. There were no accounts payable for related party transactions at June 30, 2026 and December 31, 2025.
On December 21, 2018, Cobra Aviation purchased two commercial helicopters, spare parts, support equipment and aircraft documents from Brim Equipment. Following these transactions, and also on December 21, 2018, Cobra Aviation formed a joint venture with Wexford Investment named Brim Acquisitions to acquire all outstanding equity interests in Brim Equipment. Cobra Aviation owns a 49% economic interest and Wexford Investment owns a 51% economic interest in Brim Acquisitions, and each member contributed its pro rata portion of Brim Acquisitions’ initial capital of $2.0 million. Wexford Investment is an entity controlled by Wexford. Cobra Aviation and Leopard each lease one helicopter to Brim Equipment under the terms of aircraft lease and management agreements.
On February 23, 2026, Mammoth Energy Partners LLC, a subsidiary of the Company, entered into a sublease agreement with El Toro Resources LLC, an entity controlled by Wexford and a related party of the Company. The agreement was subject to approval by Mammoth Energy Partners LLC's landlord, which approval was obtained on March 16, 2026. The sublease relates to office space located at 14201 Caliber Drive, Suite 200, Oklahoma City, Oklahoma. The sublease began on June 1, 2026 and extends through May 31, 2027, with an option to extend through April 30, 2028. The aggregate minimum lease payments under the agreement are approximately $0.2 million.
On June 2, 2026, and July 28, 2026, Cobra Aviation, a subsidiary of the Company, entered into separate aircraft lease agreements with Executive Express Aviation LLC, an entity controlled by Wexford and a related party of the Company. The first lease relates to a Pilatus Model PC12/45 aircraft, while the second lease relates to a Raytheon Aircraft Company Model 1900D aircraft. Both leases are expected to commence on August 31, 2026 and extend through August 31, 2029. The aggregate minimum lease payments under the Pilatus and Raytheon leases are approximately $1.1 million and $1.3 million, respectively.
18. Commitments and Contingencies
Commitments
From time to time, the Company may enter into agreements with suppliers that contain minimum purchase obligations and agreements to purchase capital equipment. Aggregate future minimum payments under these obligations in effect at June 30, 2026 were approximately $6.2 million.
Letters of Credit
The Company had outstanding letters of credit related to environmental remediation and insurance programs that were issued under the Company’s revolving credit facility, which is collateralized by cash and investment securities held in a collateral account maintained with the lender, totaling $5.0 million at June 30, 2026 and December 31, 2025.
Insurance
The Company has insurance coverage for physical partial loss to its assets, employer’s liability, automobile liability, commercial general liability, workers’ compensation and insurance for other specific risks. At June 30, 2026 and December 31, 2025, there was no deductible for the workers’ compensation policy. At June 30, 2026 and December 31, 2025, the Company’s primary automobile liability policy required a deductible per occurrence of up to $0.1 million.
Effective November 1, 2024, the Company became party to a deductible reimbursement insurance policy from a protected cell captive insurance company that covers losses between $0.1 million and the $0.5 million deductible under its primary auto liability policy that was in effect through October 31, 2025. Also effective November 1, 2024, the Company became a member of a group captive insurance company that covers one layer of its auto liability coverage.
The Company establishes liabilities for the unpaid deductible portion of claims incurred based on estimates. At June 30, 2026 and December 31, 2025, total accrued claims for continuing and discontinued operations were $0.6 million and
24

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
$1.2 million, respectively. Of this amount, $0.3 million and $0.4 million at June 30, 2026 and December 31, 2025, respectively, relate to continuing operations.
The Company also has insurance coverage for directors and officers liability. As of June 30, 2026 and December 31, 2025, the directors and officers liability policy had a deductible per occurrence of $1.5 million and an aggregate deductible of $10.0 million. As of June 30, 2026 and December 31, 2025, the Company did not have any accrued claims for directors and officers liability.
Effective January 1,  2026, the Company transitioned to a fully insured employee health insurance plan. Through December 31, 2025, the Company self-insured its employee health insurance. At June 30, 2026 and December 31, 2025, total accrued claims for continuing and discontinued operations were $0.3 million and $0.9 million, respectively. Of these amounts, $0.3 million at June 30, 2026 and December 31, 2025, respectively, relate to continuing operations. These estimates may change in the near term as actual claims continue to develop.
Bonds
In the ordinary course of business, the Company is required to provide bid bonds to certain customers in the infrastructure services segment as part of the bidding process. These bonds provide a guarantee to the customer that the Company, if awarded the project, will perform under the terms of the contract. Bid bonds are typically provided for a percentage of the total contract value. Additionally, the Company may be required to provide performance and payment bonds for contractual commitments related to projects in process. These bonds provide a guarantee to the customer that the Company will perform under the terms of a contract and that the Company will pay subcontractors and vendors. If the Company fails to perform under a contract or to pay subcontractors and vendors, the customer may demand that the surety make payments or provide services under the bond. The Company must reimburse the surety for expenses or outlays it incurs. At June 30, 2026 and December 31, 2025, there were no outstanding performance and payment bonds and no outstanding bid bonds that related to the Company's continuing operations.
Litigation
PREPA
Foreman Electric Services, Inc. (“Foreman”) and related parties asserted claims against Mammoth and Cobra arising from Puerto Rico restoration work performed by Cobra. As discussed in Note 2, PREPA owes Cobra $20.0 million as of June 30, 2026 pursuant to the Settlement Agreement entered into in July 2024. Payment is due following the effective date of PREPA's plan of adjustment.
Other Litigation
In July 2025, the Company settled the matter with Foreman. The settlement did not have a material adverse effect on the Company’s business, financial condition, results of operations or cash flows.
The Company is routinely involved in state and local tax audits. During 2015, the State of Ohio assessed taxes on the purchase of equipment the Company believes is exempt under state law. The Company appealed the assessment and a hearing was held in 2017. As a result of the hearing, the Company received a decision from the State of Ohio, which the Company appealed. On February 25, 2022, the Company received an unfavorable decision on the appeal. The Company appealed the decision. On August 2, 2023, the Ohio Supreme Court affirmed the ruling in part and reversed the ruling in part. The Company received the final assessment in April 2025. It did not have a material adverse effect on the Company’s business, financial condition, results of operations or cash flows.
Cobra has been named in 15 lawsuits brought by municipalities in Puerto Rico seeking construction excise taxes and volume of business taxes associated with restoration work performed in Puerto Rico. Several adverse judgments have been entered, and certain matters remain subject to ongoing appellate and post-judgment proceedings. Cobra continues to challenge these assessments and intends to vigorously defend these matters. In connection with the Settlement Agreement entered into with PREPA, PREPA and related governmental parties have agreed to cooperate with Cobra in connection with the resolution of these matters. However, there can be no assurance that these efforts will be successful. Based on the current status of the proceedings, management is unable to reasonably estimate a range of possible loss, if any, beyond amounts already accrued. Accordingly no additional liability has been recorded. The Company will continue to evaluate these matters as additional information becomes available.
On April 16, 2019, Christopher Williams, a former employee of Higher Power Electrical, LLC, filed a putative class and collective action complaint titled Christopher Williams, individually and on behalf of all others similarly situated v.
25

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
Higher Power Electrical, LLC, Cobra Acquisitions LLC, and Cobra Energy LLC in the U.S. District Court for the District of Puerto Rico. On June 24, 2019, the complaint was amended to replace Mr. Williams with Matthew Zeisset as the named plaintiff. The plaintiff alleges the defendant failed to pay overtime wages to a class of workers in compliance with the Fair Labor Standards Act and Puerto Rico law. On August 21, 2019, upon request of the parties, the Court stayed proceedings in the lawsuit and administratively closed the case pending completion of individual arbitration proceedings initiated by Mr. Zeisset and opt-in plaintiffs. Other claimants subsequently initiated additional individual arbitration proceedings asserting similar claims. The Company has agreed to settlements with a portion of the claimants. Arbitrations remain pending for the remaining claimants. The Company will continue to vigorously defend the arbitrations. The Company has recognized an estimated liability related to the remaining complaints, which is included in “accounts payable” in the accompanying unaudited condensed consolidated balance sheets. The amount required to resolve these matters may ultimately increase or decrease from the Company’s estimated amount as the matters progress.
The Company is involved in various other legal proceedings in the ordinary course of business. Although the Company cannot predict the outcome of these proceedings, legal matters are subject to inherent uncertainties and there exists the possibility that the ultimate resolution of these matters could have a material impact on the Company’s business, financial condition, results of operations or cash flows.
Defined Contribution Plan
The Company sponsors a 401(k) defined contribution plan for the benefit of substantially all employees at their date of hire. The plan allows eligible employees to contribute up to 92% of their annual compensation, not to exceed annual limits established by the federal government. The Company makes discretionary matching contributions of up to 3% of an employee’s compensation and may make additional discretionary contributions for eligible employees. For the three and six months ended June 30, 2026 and 2025, the Company paid $0.1 million, $0.2 million, $0.3 million and $0.8 million, respectively, in contributions to the plan. Of these amounts for the three and six months ended June 30, 2026 and 2025, $0.1 million, $0.2 million, $0.1 million and $0.1 million, respectively, relates to continuing operations.
19. Reportable Segments
The Company’s Chief Operating Officer, Chief Financial Officer and Chief Business Officer comprise the Company’s chief operating decision makers (“CODM”). Segment information is prepared on the same basis that the CODM manages the segments, evaluates the segment financial statements and makes key operating and resource utilization decisions. Segment evaluation is determined on a quantitative basis based on a function of Adjusted EBITDA, as well as a qualitative basis, such as nature of the product and service offerings and types of customers. The Company defines Adjusted EBITDA as net income (loss) from continuing operations before depreciation, depletion, amortization and accretion, gains on disposal of assets, net, impairment of long lived assets, equity based compensation, stock based compensation, interest income, net, inclusive of related parties, (loss) gain on marketable securities, net, other (income) expense, net and provision for income taxes. The Company’s significant segment expenses include cost of revenue, exclusive of depreciation, depletion, amortization and accretion, and selling, general and administrative expense.
The Company principally provides products and services to customers operating in the oil and natural gas, aviation and utility infrastructure industries. At June 30, 2026, the Company had five reportable segments, which includes rental services (“Rentals”), infrastructure services (“Infrastructure”), natural sand proppant services (“Sand”), accommodation services (“Accommodations”) and drilling services (“Drilling”). The Company has determined that its operating segments meet the criteria in ASC Topic 280, Segment Reporting, and are reported as five reportable segments.
Sales from one segment to another are generally priced at estimated equivalent commercial selling prices. All transactions conducted between segments are eliminated in consolidation. Transactions conducted by companies within the same reportable segment are eliminated within each reportable segment. Corporate selling, general and administrative costs are allocated to each segment based on forecasted revenue, expense and asset base. Corporate interest expense is allocated to each segment based on its intercompany payable position with the Company’s corporate entity. U.S. income tax expense is not allocated to each segment. Foreign income tax expense is realized in the segment in which the foreign operations occur.
To reflect how the CODM evaluates the business, prior period segment information has been recast to conform with our reportable segment composition as of June 30, 2026. The following tables set forth certain financial information with respect to the Company’s reportable segments (in thousands):
26

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Three Months Ended June 30, 2026 | Rentals | Infrastructure | Sand | Accommodations | Drilling | Total
Revenue from external and related party customers | $ | 10,115 |  | $ | 940 |  | $ | 7,975 |  | $ | 3,202 |  | $ | 3,822 |  | $ | 26,054 |
Intersegment revenue | 108 |  | — |  | — |  | — |  | — |  | 108 |
| 10,223 |  | 940 |  | 7,975 |  | 3,202 |  | 3,822 |  | 26,162 |
Reconciliation of Revenue |  |  |  |  |  |
Other(b) |  |  |  |  |  | 48 |
Eliminations(a) |  |  |  |  |  | (156) |
Total consolidated revenue |  |  |  |  |  | $ | 26,054 |
Less segment expenses: |  |  |  |  |  |
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion, inclusive of related parties | 4,722 |  | 1,540 |  | 7,713 |  | 2,118 |  | 2,972 |  |
Selling, general and administrative, exclusive of stock based compensation | 1,775 |  | 290 |  | 685 |  | 288 |  | 230 |  |
Segment Adjusted EBITDA | $ | 3,726 |  | $ | (890) |  | $ | (423) |  | $ | 796 |  | $ | 620 |  | $ | 3,829 |
Reconciliation of total segment Adjusted EBITDA |  |  |  |  |
Less: |  |  |  |  |  |
Other(b) |  |  |  |  |  | $ | 1,208 |
Depreciation, depletion, amortization and accretion |  |  |  |  | 4,634 |
Gains on disposal of assets, net |  |  |  |  |  | (4,641) |
Equity based compensation |  |  |  |  |  | 544 |
Interest expense, net |  |  | 784 |
Loss on marketable securities, net |  |  |  |  | 1,116 |
Other income, net |  |  |  |  |  | (471) |
Income from continuing operations before income taxes |  |  |  |  | $ | 655 |

27

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Three Months Ended June 30, 2025 | Rentals | Infrastructure | Sand | Accommodations | Drilling | Total
Revenue from external and related party customers | $ | 3,078 |  | $ | 1,389 |  | $ | 5,376 |  | $ | 1,767 |  | $ | 743 |  | $ | 12,353 |
Intersegment revenue | 28 |  | — |  | — |  | — |  | — |  | 28 |
| 3,106 |  | 1,389 |  | 5,376 |  | 1,767 |  | 743 |  | 12,381 |
Reconciliation of Revenue |  |  |  |  |  |
Eliminations(a) |  |  |  |  |  | (28) |
Total consolidated revenue |  |  |  |  |  | $ | 12,353 |
Less segment expenses: |  |  |  |  |  |
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion, inclusive of related parties | $ | 1,567 |  | $ | 1,355 |  | $ | 5,262 |  | $ | 1,242 |  | $ | 758 |  |
Selling, general and administrative, exclusive of stock based compensation | 1,121 |  | 203 |  | 1,386 |  | 407 |  | 210 |  |
Segment Adjusted EBITDA | $ | 418 |  | $ | (169) |  | $ | (1,272) |  | $ | 118 |  | $ | (225) |  | $ | (1,130) |
Reconciliation of total segment Adjusted EBITDA |  |  |  |  |
Less: |  |  |  |  |  |
Other(b) |  |  |  |  |  | $ | 2,378 |
Depreciation, depletion, amortization and accretion |  |  |  |  | 2,827 |
Gains on disposal of assets, net |  |  |  |  |  | (1,077) |
Impairment of long-lived assets |  |  |  |  |  | 31,669 |
Stock based compensation |  |  |  |  |  | 200 |
Interest income, net |  |  | (298) |
Other expense, net |  |  |  |  |  | 628 |
Loss from continuing operations before income taxes |  |  |  |  | $ | (37,457) |

28

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Six Months Ended June 30, 2026 | Rentals | Infrastructure | Sand | Accommodations | Drilling | Total
Revenue from external and related party customers | $ | 23,050 |  | $ | 1,208 |  | $ | 11,839 |  | $ | 6,743 |  | $ | 5,245 |  | $ | 48,085 |
Intersegment revenue | 140 |  | — |  | — |  | — |  | — |  | 140 |
| 23,190 |  | 1,208 |  | 11,839 |  | 6,743 |  | 5,245 |  | 48,225 |
Reconciliation of Revenue |  |  |  |  |  |
Other(b) |  |  |  |  |  | 96 |
Eliminations(a) |  |  |  |  |  | (236) |
Total consolidated revenue |  |  |  |  |  | $ | 48,085 |
Less segment expenses: |  |  |  |  |  |
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion, inclusive of related parties | $ | 12,781 |  | $ | 2,051 |  | $ | 12,168 |  | $ | 4,257 |  | $ | 4,164 |  |
Selling, general and administrative, exclusive of stock based compensation | 3,043 |  | 476 |  | 1,538 |  | 620 |  | 482 |  |
Segment Adjusted EBITDA | $ | 7,366 |  | $ | (1,319) |  | $ | (1,867) |  | $ | 1,866 |  | $ | 599 |  | $ | 6,645 |
Reconciliation of total segment Adjusted EBITDA
Less: |  |  |  |  |  |
Other(b) |  |  |  |  |  | $ | 2,096 |
Depreciation, depletion, amortization and accretion |  |  |  |  | 8,104 |
Gains on disposal of assets, net |  |  |  |  |  | (5,316) |
Equity based compensation |  |  |  |  |  | 544 |
Interest expense, net |  |  | 270 |
Gain on marketable securities, net |  |  |  |  | (5,987) |
Other expense, net |  |  |  |  |  | 138 |
Income from continuing operations before income taxes |  |  |  |  | $ | 6,796 |

29

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Six Months Ended June 30, 2025 | Rentals | Infrastructure | Sand | Accommodations | Drilling | Total
Revenue from external and related party customers | $ | 4,994 |  | $ | 2,102 |  | $ | 12,115 |  | $ | 3,847 |  | $ | 925 |  | $ | 23,983 |
Intersegment revenue | 38 |  | — |  | — |  | — |  | — |  | 38 |
| 5,032 |  | 2,102 |  | 12,115 |  | 3,847 |  | 925 |  | 24,021 |
Reconciliation of Revenue |  |  |  |  |  |
Eliminations(a) |  |  |  |  |  | (38) |
Total consolidated revenue |  |  |  |  |  | $ | 23,983 |
Less segment expenses: |  |  |  |  |  |
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion, inclusive of related parties | $ | 2,984 |  | $ | 2,229 |  | $ | 10,738 |  | $ | 2,673 |  | $ | 1,154 |  |
Selling, general and administrative, exclusive of stock based compensation | 1,488 |  | 323 |  | 2,816 |  | 796 |  | 420 |  |
Segment Adjusted EBITDA | $ | 560 |  | $ | (450) |  | $ | (1,439) |  | $ | 378 |  | $ | (649) |  | $ | (1,600) |
Reconciliation of total segment Adjusted EBITDA
Less: |  |  |  |  |  |
Other(b) |  |  |  |  |  | $ | 4,248 |
Depreciation, depletion, amortization and accretion |  |  |  |  | 4,910 |
Gains on disposal of assets, net |  |  |  |  |  | (4,549) |
Impairment of other long-lived assets |  |  |  |  | 31,669 |
Stock based compensation |  |  |  |  |  | 412 |
Interest income, net |  |  | (383) |
Other expense, net |  |  |  |  |  | 960 |
Loss from continuing operations before income taxes |  |  |  |  | $ | (38,867) |
(a) Includes eliminations for intersegment transactions.
(b) Includes activity related to non-operating legacy services that are no longer active.

| Rentals | Infrastructure | Sand | Accommodations | Drilling | Total
As of June 30, 2026: |  |  |  |  |  |
Total assets for reportable segments | $ | 126,384 |  | $ | 13,192 |  | $ | 69,282 |  | $ | 14,076 |  | $ | 5,080 |  | $ | 228,014 |
Other assets(a) |  |  |  |  |  | 116,608 |
Total consolidated assets, excluding discontinued operations |  |  |  | $ | 344,622 |
As of December 31, 2025: |  |  |  |  |  |
Total assets for reportable segments | $ | 75,004 |  | $ | 2,598 |  | $ | 68,028 |  | $ | 14,309 |  | $ | 1,859 |  | $ | 161,798 |
Other assets(a) |  |  |  |  |  | 167,900 |
Total consolidated assets, excluding discontinued operations |  |  |  | $ | 329,698 |
(a) Includes assets related to non-operating legacy services that are no longer active as well as corporate related assets, which include cash and cash equivalents, marketable securities, restricted cash and other current assets.

30

MAMMOTH ENERGY SERVICES, INC.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
20. Subsequent Events
On July 27, 2026, the Company committed to purchase three aircraft for an aggregate purchase price of $32.4 million. As part of this commitment, the Company made a non-refundable security deposit of approximately $0.6 million. As of the date of issuance of these financial statements, definitive purchase agreements had not been executed.
On July 30, 2026, Cobra Aviation entered into two separate purchase agreements with a third‑party seller to purchase two auxiliary power units (“APUs”) for aggregate consideration of approximately $7.1 million. In connection with these agreements, the Company made a non-refundable deposit of approximately $0.4 million. On July 31, 2026, the Company completed the purchase of one of the APUs for approximately $3.6 million.
On July 31, 2026, Stingray Rentals committed to purchase rental equipment of approximately $7.2 million.
On August 7, 2026, Cobra Aviation committed to sell an aircraft engine for $7.7 million.
31

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations
The following discussion should be read in conjunction with the unaudited condensed consolidated financial statements and related notes thereto presented in this Quarterly Report and the consolidated financial statements and related notes thereto included in our Annual Report on Form 10-K. This discussion contains forward-looking statements reflecting our current expectations, estimates and assumptions concerning events and financial trends that may affect our future operating results or financial position. Actual results and the timing of events may differ materially from those contained in these forward-looking statements due to a number of factors, including those discussed in Item 1A. “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2025, filed with the Securities and Exchange Commission, or the SEC, on March 6, 2026 and the section entitled “Cautionary Note Regarding Forward-Looking Statements” appearing elsewhere in this Quarterly Report.
Overview
We are an integrated, growth-oriented company focused on providing products and services to our customers primarily in the aviation, oil and natural gas and utility infrastructure industries. Our suite of services includes rental services, infrastructure services, natural sand proppant services, accommodation services and drilling services. Our rental services segment provides a wide range of equipment used in oilfield, construction and aviation activities. Our infrastructure services segment provides engineering, design and fiber optic services to the utility industry. Our natural sand proppant services segment mines, processes and sells natural sand proppant used for hydraulic fracturing. Our accommodation services provide housing, kitchen and dining, and recreational service facilities for workers located in remote areas away from readily available lodging. Our drilling services provide directional drilling to oilfield operators.
We are focused on driving returns through improved execution by prioritizing asset utilization, margin expansion, and capital efficiency across the portfolio. While macroeconomic uncertainty, including tariffs and demand volatility, continues to affect parts of the market, we remain proactive in repositioning Mammoth to perform through differing business cycles.
Business Developments
During 2025, we completed four strategic divestitures. On April 11, 2025, we sold a portion of our infrastructure services entities, including our distribution, transmission and substation operations, for aggregate proceeds of approximately $108.7 million. On June 16, 2025, we sold all of the equipment previously used in our hydraulic fracturing services for $15.0 million. On September 15, 2025, the Company completed the sale of assets related to its natural sand proppant operations at its Piranha Proppant LLC processing plant. On December 2, 2025, we completed the sale of our engineering services business, Aquawolf for approximately $30.0 million. The results of operations, financial position and cash flows for these businesses are reported as discontinued operations for all periods presented and discussed in this report. Unless otherwise indicated, the information presented in this Management’s Discussion and Analysis relates only to our continuing operations.
To reflect how management evaluates the business after these divestitures, prior period segment information in our results of operations below has been recast to conform with our segment composition as of June 30, 2026. See Note 4. Discontinued Operations of the notes to our unaudited condensed consolidated financial statements for more information.
During the second quarter of 2026, we expanded our fiber optic services offering through the acquisitions of Mission Construction LLC and BERE Rentals LLC, both providers of fiber optic services to utility customers in the midwestern region of the United States. On June 12, 2026, we acquired all of the outstanding equity interests in Mission Construction LLC for aggregate consideration of $3.1 million and all of the outstanding equity interests in BERE Rentals LLC for aggregate consideration of $3.4 million. The acquisitions were funded with cash on hand. These acquisitions extend our presence in the fiber optic services market and broaden the range of services we provide to utility customers in the region.
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Overview of Our Industries
Aircraft Industry
Demand for aviation assets remained favorable during the quarter, supporting increased utilization and revenue in our aviation rental business. We continue to evaluate opportunities to expand our aviation fleet as market conditions warrant.
Oil and Natural Gas Industry
Customer activity improved during 2026, contributing to higher utilization across our drilling, rental and accommodation businesses, although commodity price volatility continues to create uncertainty.
Infrastructure Industry
Demand for our fiber optic services continues to be supported by communications infrastructure investment and broadband deployment initiatives.
Settlement Agreement with PREPA
See Notes 2 and 18 for discussion of the PREPA Settlement Agreement.
Second Quarter 2026 Financial Overview
Revenue increased 110%, to $26.1 million during the second quarter of 2026, driven primarily by aviation, accommodation and drilling activities. Operating income improved to $2.6 million compared to an operating loss of $37.1 million in the prior-year period, reflecting higher utilization and the absence of the impairment charges recorded in 2025. Adjusted EBITDA improved to $2.6 million from a loss of $3.5 million in the prior year period. See “Non-GAAP Financial Measures” for a reconciliation of net income (loss) from continuing operations to Adjusted EBITDA.
Future Results
We remain focused on increasing equipment utilization, expanding our aviation rental platform, developing our infrastructure services business and maintaining capital discipline. While uncertainty remains regarding commodity prices, tariffs and broader economic conditions, we believe our current liquidity position and operating platform will support continued execution of our business strategy during the remainder of 2026.
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Results of Operations
Three Months Ended June 30, 2026 Compared to Three Months Ended June 30, 2025

| Three Months Ended
| June 30, 2026 |  | June 30, 2025
| (in thousands)
Revenue: |  |  |
Rental services and aviation sales | $ | 10,223 |  |  | $ | 3,106 |
Infrastructure services | 940 |  |  | 1,389 |
Natural sand proppant services | 7,975 |  |  | 5,376 |
Accommodation services | 3,202 |  |  | 1,767 |
Drilling services | 3,822 |  |  | 743 |
Other services | 48 |  |  | — |
Eliminations | (156) |  |  | (28) |
Total revenue | 26,054 |  |  | 12,353 |
Cost of revenue: |  |  |
Rental services and aviation sales (exclusive of depreciation and amortization of $3,455 and $929 for the three months ended June 30, 2026 and 2025, respectively) | 4,722 |  |  | 1,567 |
Infrastructure services (exclusive of depreciation and amortization of $129 and $56 for the three months ended June 30, 2026 and 2025, respectively) | 1,540 |  |  | 1,355 |
Natural sand proppant services (exclusive of depreciation, depletion and accretion of $676 and $1,413 for the three months ended June 30, 2026 and 2025, respectively) | 7,713 |  |  | 5,262 |
Accommodation services (exclusive of depreciation and accretion of $288 and $267 for the three months ended June 30, 2026 and 2025, respectively) | 2,118 |  |  | 1,242 |
Drilling services (exclusive of depreciation of $24 and $23 for the three months ended June 30, 2026 and 2025, respectively) | 2,972 |  |  | 758 |
Other services (exclusive of depreciation of $62 and $139 for the three months ended June 30, 2026 and 2025, respectively) | 292 |  |  | 947 |
Eliminations | (156) |  |  | (28) |
Total cost of revenue | 19,201 |  |  | 11,103 |
Selling, general and administrative | 4,232 |  |  | 4,958 |
Depreciation, depletion, amortization and accretion | 4,634 |  |  | 2,827 |
Gains on disposal of assets, net | (4,641) |  |  | (1,077) |
Impairment of long-lived assets | — |  |  | 31,669 |
Operating income (loss) | 2,628 |  |  | (37,127) |
Interest (expense) income, net | (784) |  |  | 298 |
Loss on marketable securities, net | (1,116) |  |  | — |
Other expense, net | (73) |  |  | (628) |
Income (loss) before income taxes | 655 |  |  | (37,457) |
Provision (benefit) for income taxes | 1,853 |  |  | (934) |
Net loss from continuing operations | (1,198) |  |  | (36,523) |
Net income from discontinued operations, net of income taxes | 438 |  |  | 45,371 |
Net (loss) income | $ | (760) |  |  | $ | 8,848 |

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Revenue. Revenue for the three months ended June 30, 2026 increased $13.7 million, or 110%, to $26.1 million compared to $12.4 million for the same period in 2025. The increase in total revenue is primarily attributable to increases in revenue for rental, natural sand proppant, accommodation and drilling services during the three months ended June 30, 2026, which was partially offset by a decrease in revenue for infrastructure services. Revenue by segment was as follows:
Rental Services and Aviation Sales. Rental services and aviation sales revenue increased $7.1 million, or 229%, to $10.2 million for the three months ended June 30, 2026 compared to $3.1 million for the same period in 2025. The increase reflected $5.7 million from aviation fleet expansion, higher aviation utilization and increased aviation sales activity. Aviation utilization improved from 34% during the prior-year period to 71% during the current-year period, while fleet capacity increased through aircraft acquisitions completed during 2025 and 2026. The increase in aviation revenue was partially driven by the sale of an airframe and landing gear for $2.0 million. Revenue also benefited from a 38% increase in the average number of pieces of equipment rented to customers to 407 for the three months ended June 30, 2026 compared to 296 for the same period in 2025.
Infrastructure Services. Infrastructure services revenue decreased $0.5 million, or 36%, to $0.9 million for the three months ended June 30, 2026 compared to $1.4 million for the same period in 2025. The decrease in revenue was primarily due to a decrease in fiber optic revenue related to a loss of a customer and decreased activity. Infrastructure results also reflected transition-related costs and underutilization associated with customer changes and the integration of recent acquisitions. Management expects utilization and operating performance to improve as these acquisitions are further integrated and customer activity expands.
Natural Sand Proppant Services. Natural sand proppant services revenue increased $2.6 million, or 48%, to $8.0 million for the three months ended June 30, 2026 compared to $5.4 million for the same period in 2025 primarily due to a $2.9 million increase in freight revenue. This was partially offset by a 5% decrease in tons of sand sold to 229,031 tons for the three months ended June 30, 2026 compared to 241,763 tons for the same period in 2025, combined with an immaterial decline in the average price per ton of sand sold to $21.36 per ton during the three months ended June 30, 2026 compared to $21.41 per ton for the same period in 2025. The average price per ton of sand sold decreased primarily due to a shift of grade mix to include more coarse sand.
Accommodation Services. Accommodation services revenue increased $1.4 million, or 78%, to $3.2 million for the three months ended June 30, 2026 compared to $1.8 million for the same period in 2025. The increase reflected higher occupancy levels and improved utilization driven by increased customer activity. On average, 259 rooms were utilized during the three months ended June 30, 2026 as compared to 145 for the same period in 2025 for our accommodation services.
Drilling Services. Drilling services revenue increased $3.1 million or 443% to $3.8 million for the three months ended June 30, 2026 compared to $0.7 million for the same period in 2025. The increase in our drilling services revenue was primarily attributable to increased utilization, which increased to 43% for the three months ended June 30, 2026 compared to 16% for the same period in 2025. This was coupled with proceeds of $0.3 million from the sale of equipment damaged or lost down-hole and higher average day rates for our drilling services for the three months ended June 30, 2026.
Cost of Revenue (exclusive of depreciation, depletion, amortization and accretion). Cost of revenue, exclusive of depreciation, depletion, amortization and accretion, increased $8.1 million to $19.2 million, or 74% of total revenue, for the three months ended June 30, 2026 compared to $11.1 million, or 90% of total revenue, for the same period in 2025. Cost of revenue by segment was as follows:
Rental Services and Aviation Sales. Rental services and aviation sales cost of revenue, exclusive of depreciation and amortization, increased $3.1 million, or 194%, to $4.7 million for the three months ended June 30, 2026 compared to $1.6 million for the same period in 2025. The increase was primarily attributable to higher operating activity associated with the aviation fleet expansion, increased utilization and the sale of an airframe and landing gear with a cost basis of $2.0 million. As a percentage of revenue, our rental services cost of revenue, exclusive of depreciation and amortization of $3.5 million and $0.9 million for the three months ended June 30, 2026 and 2025, was 46% and 52%, respectively. Despite the increase in operating costs, segment margins benefited from higher aircraft utilization and improved absorption of fixed operating expenses.
Infrastructure Services. Infrastructure services cost of revenue, exclusive of depreciation, increased $0.1 million, or 7%, to $1.5 million for the three months ended June 30, 2026 compared to $1.4 million for the same period in 2025. As a percentage of revenue, cost of revenue, exclusive of depreciation of $0.1 million for the three months ended June 30, 2026 and 2025, was 167% and 100% for the three months ended June 30, 2026 and 2025,
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respectively. The increase as a percentage of revenue is primarily due to an increase in compensation and benefits and fuel expense coupled with a decrease in utilization, resulting in a higher ratio of fixed costs to variable costs.
Natural Sand Proppant Services. Natural sand proppant services cost of revenue, exclusive of depreciation, depletion and accretion, increased $2.4 million, or 45%, to $7.7 million for the three months ended June 30, 2026 compared to $5.3 million for the same period in 2025. As a percentage of revenue, cost of revenue, exclusive of depreciation, depletion and accretion of $0.7 million and $1.4 million for the three months ended June 30, 2026 and 2025, was 96% and 98% for the three months ended June 30, 2026 and 2025, respectively. The decrease in cost as a percentage of revenue is primarily due to an increase in freight revenue, which was offset by a 5% decrease in tons sold and a nominal decline in average sales price per ton.
Accommodation Services. Accommodation services cost of revenue, exclusive of depreciation and accretion, increased $0.9 million, or 75%, to $2.1 million for the three months ended June 30, 2026 compared to $1.2 million for the same period in 2025. As a percentage of revenue, cost of revenue, exclusive of depreciation and accretion of $0.3 million and $0.3 million for the three months ended June 30, 2026 and 2025, was 66% and 67% for the three months ended June 30, 2026 and 2025, respectively. Operating costs increased as utilization improved; however, segment margins benefited from greater absorption of fixed operating costs resulting from higher occupancy.
Drilling Services. Drilling services cost of revenue, exclusive of depreciation, increased $2.2 million, or 275%, to $3.0 million for the three months ended June 30, 2026 compared to $0.8 million for the same period in 2025. As a percentage of revenue, cost of revenue, exclusive of depreciation of immaterial amounts for the three months ended June 30, 2026 and 2025, was 79% and 114% for the three months ended June 30, 2026 and 2025, respectively. The decrease as a percentage of revenue is primarily due to an increase in utilization, resulting in a lower ratio of fixed costs to variable costs.
Other Services. Other services cost of revenue, exclusive of depreciation, decreased $0.6 million to $0.3 million for the three months ended June 30, 2026 compared to $0.9 million for the same period in 2025. The decrease is primarily due to lower compensation and benefits expense and reduced insurance costs associated with non-operating legacy services.
Selling, General and Administrative. Selling, general and administrative expense decreased $0.8 million, or 16%, to $4.2 million for the three months ended June 30, 2026 compared to $5.0 million for the same period in 2025. The decrease was primarily attributable to lower corporate overhead and professional service costs. SG&A expense represented 16% of revenue during the three months ended June 30, 2026 compared to 40% during the prior-year period, reflecting improved operating leverage on higher revenue levels.
Depreciation, Depletion, Amortization and Accretion. Depreciation, depletion, amortization and accretion totaled $4.6 million for the three months ended June 30, 2026 compared to $2.8 million for the same period in 2025. The increase is primarily attributable to increased depreciation of property, plant and equipment resulting from aviation assets being placed into service.
Gains on Disposal of Assets, Net. Net gains on the disposal of assets, net were $4.6 million compared to $1.1 million for the three months ended June 30, 2026 and 2025, respectively. Gains on the disposal of assets is primarily related to the sale of drilling rigs for the three months ended June 30, 2026 and trucks and field equipment for the same period in 2025.
Impairment of Long-Lived Assets. During the three months ended June 30, 2025, the Company’s management made the decision to market assets related to its natural sand proppant operations at its Piranha Proppant LLC and Muskie Proppant LLC processing plants. As a result, the Company recognized impairment expense on these assets totaling $31.7 million during the three months ended June 30, 2025. There was no similar activity during the three months ended June 30, 2026.
Operating Income (Loss). We reported operating income of $2.6 million for the three months ended June 30, 2026 compared to an operating loss of $37.1 million for the same period in 2025. The increase in operating income is primarily due to an increase in activity for our rental, accommodation and drilling services.
Interest (Expense) Income, Net. Interest expense was $0.8 million for the three months ended June 30, 2026 compared to interest income of $0.3 million for the same period in 2025. The increase in interest expense is primarily due to a one time charge of $1.2 million of unamortized debt issuance costs during the three months ended June 30, 2026 in relation to the new credit agreement.
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Loss on Marketable Securities, Net. Net loss on marketable securities was $1.1 million for the three months ended June 30, 2026 compared to the prior‑year period in which no marketable securities were held.
Other Expense, Net. Other expense, net was $0.1 million for the three months ended June 30, 2026 compared to $0.6 million for the same period in 2025.
Provision (Benefit) for Income Taxes. We recorded income tax expense of $1.9 million on pre-tax income of $0.7 million for the three months ended June 30, 2026 compared to income tax benefit of $0.9 million on pre-tax loss of $37.5 million for the same period in 2025. Our effective tax rates were 282.9% and 2.5% for the three months ended June 30, 2026 and 2025, respectively. The increase in the effective tax rate was primarily attributable to changes in valuation allowances, interest and penalties, withholding taxes and other foreign tax items, as well as the change from a pre-tax loss for the three months ended June 30, 2025 to pre-tax income for the three months ended June 30, 2026.
Discontinued Operations. We recorded net income from discontinued operations, net of income taxes totaling $0.4 million during the three months ended June 30, 2026 compared to $45.4 million for the same period in 2025. See Note 4 of the notes to our unaudited condensed consolidated financial statements for a breakout of the results of operations for our discontinued operations.
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Six Months Ended June 30, 2026 Compared to Six Months Ended June 30, 2025

| Six Months Ended
| June 30, 2026 |  | June 30, 2025
| (in thousands)
Revenue: |  |  |
Rental services and aviation sales | $ | 23,190 |  |  | $ | 5,032 |
Infrastructure services | 1,208 |  |  | 2,102 |
Natural sand proppant services | 11,839 |  |  | 12,115 |
Accommodation services | 6,743 |  |  | 3,847 |
Drilling services | 5,245 |  |  | 925 |
Other services | 96 |  |  | — |
Eliminations | (236) |  |  | (38) |
Total revenue | 48,085 |  |  | 23,983 |
Cost of revenue: |  |  |
Rental services and aviation sales (exclusive of depreciation and amortization of $6,067 and $1,095 for the six months ended June 30, 2026 and 2025, respectively) | 12,781 |  |  | 2,984 |
Infrastructure services (exclusive of depreciation and amortization of $185 and $108 for the six months ended June 30, 2026 and 2025, respectively) | 2,051 |  |  | 2,229 |
Natural sand proppant services (exclusive of depreciation, depletion and accretion of $1,105 and $2,289 for the six months ended June 30, 2026 and 2025, respectively) | 12,168 |  |  | 10,738 |
Accommodation services (exclusive of depreciation and accretion of $575 and $526 for the six months ended June 30, 2026 and 2025, respectively) | 4,257 |  |  | 2,673 |
Drilling services (exclusive of depreciation of $41 and $53 for the six months ended June 30, 2026 and 2025, respectively) | 4,164 |  |  | 1,154 |
Other services (exclusive of depreciation of $131 and $839 for the six months ended June 30, 2026 and 2025, respectively) | 523 |  |  | 1,429 |
Eliminations | (236) |  |  | (38) |
Total cost of revenue | 35,708 |  |  | 21,169 |
Selling, general and administrative | 7,828 |  |  | 9,074 |
Depreciation, depletion, amortization and accretion | 8,104 |  |  | 4,910 |
Gains on disposal of assets, net | (5,316) |  |  | (4,549) |
Impairment of long-lived assets | — |  |  | 31,669 |
Operating income (loss) | 1,761 |  |  | (38,290) |
Interest (expense) income, net | (270) |  |  | 383 |
Gain on marketable securities, net | 5,987 |  |  | — |
Other expense, net | (682) |  |  | (960) |
Income (loss) before income taxes | 6,796 |  |  | (38,867) |
Provision (benefit) for income taxes | 3,309 |  |  | (97) |
Net income (loss) from continuing operations | 3,487 |  |  | (38,770) |
Net income from discontinued operations, net of income taxes | 940 |  |  | 47,081 |
Net income | $ | 4,427 |  |  | $ | 8,311 |

Revenue. Revenue for the six months ended June 30, 2026 increased $24.1 million, or 100%, to $48.1 million from $24.0 million for the same period in 2025. The increase in total revenue is primarily attributable to increases in rental, accommodation and drilling services, partially offset by decreases in infrastructure services and natural sand proppant services revenue. Revenue by segment was as follows:
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Rental Services and Aviation Sales. Rental services and aviation sales revenue increased $18.2 million, or 364%, to $23.2 million for the six months ended June 30, 2026 compared to $5.0 million for the same period in 2025. Revenue growth was driven by aviation fleet expansion, increased aircraft utilization and higher aviation sales activity. Aviation rental revenue increased $15.8 million and equipment rental revenue increased $2.4 million. The increase in aviation revenue was partially driven by the sale of an auxiliary power unit and an airframe and landing gear for $8.5 million. The increase in our equipment rental revenue was driven by a 51% increase in the average number of pieces of equipment rented to customers to 398 for the six months ended June 30, 2026 compared to 264 for the same period in 2025.
Infrastructure Services. Infrastructure services revenue decreased $0.9 million, or 43%, to $1.2 million for the six months ended June 30, 2026 compared to $2.1 million for the same period in 2025. The decrease in revenue was primarily due to a decrease in fiber optic revenue related to a loss of a customer and decreased activity. Infrastructure results also reflected transition-related costs and underutilization associated with customer changes and the integration of recent acquisitions. Management expects utilization and operating performance to improve as these acquisitions are further integrated and customer activity expands.
Natural Sand Proppant Services. Natural sand proppant services revenue decreased $0.3 million, or 2%, to $11.8 million for the six months ended June 30, 2026 compared to $12.1 million for the same period in 2025. The decrease in our natural sand proppant services revenue was primarily due to a 11% decrease in tons of sand sold to approximately 384,628 tons for the six months ended June 30, 2026 compared to approximately 430,783 tons for the same period in 2025, coupled with a 4% decrease in the average sales price per ton of sand sold to $20.60 per ton during the six months ended June 30, 2026 compared to $21.44 per ton for the same period in 2025. The average price per ton of sand sold decreased primarily due to a shift of grade mix to include more coarse sand.
Accommodation Services. Accommodation services revenue increased $2.9 million, or 76%, to $6.7 million for the six months ended June 30, 2026, compared to $3.8 million for the same period in 2025. Revenue growth reflected increased occupancy. On average, 267 rooms were utilized during the six months ended June 30, 2026 compared to 162 for the same period in 2025 for our accommodation services.
Drilling Services. Drilling services revenue increased $4.3 million, or 478%, to $5.2 million for the six months ended June 30, 2026, compared to $0.9 million for the same period in 2025. The increase in our drilling services revenue was primarily attributable to increased utilization, which increased to 32% for the six months ended June 30, 2026 compared to 15% for the same period in 2025. This was coupled with proceeds of $0.3 million from the sale of equipment damaged or lost down-hole and higher average day rates for our drilling services for the six months ended June 30, 2026.
Cost of Revenue (exclusive of depreciation, depletion, amortization and accretion). Cost of revenue, exclusive of depreciation, depletion, amortization and accretion, increased $14.5 million to $35.7 million, or 74% of total revenue, for the six months ended June 30, 2026, compared to $21.2 million, or 88% of total revenue, for the same period in 2025. Cost of revenue by segment was as follows:
Rental Services and Aviation Sales. Rental services and aviation sales cost of revenue, exclusive of depreciation and amortization, increased $9.8 million, or 327%, to $12.8 million for the six months ended June 30, 2026 compared to $3.0 million for the same period in 2025. The increase reflected higher operating activity associated with aviation fleet expansion and increased utilization as well as the sale of an auxiliary power unit and an airframe and landing gear with an aggregate cost basis of $7.8 million. As a percentage of revenue, our rental services cost of revenue, exclusive of depreciation and amortization of $6.1 million and $1.1 million for the six months ended June 30, 2026 and 2025, respectively, was 55% and 60% for the six months ended June 30, 2026 and 2025, respectively. The decrease as a percentage of revenue is primarily due to an increase in utilization, combined with the investment in aviation assets, which produces a higher gross margin percentage.
Infrastructure Services. Infrastructure services cost of revenue, exclusive of depreciation, decreased $0.1 million, or 5%, to $2.1 million for the six months ended June 30, 2026 compared to $2.2 million for the same period in 2025. As a percentage of revenue, cost of revenue, exclusive of depreciation and amortization of $0.2 million and $0.1 million for the six months ended June 30, 2026 and 2025, respectively was 175% and 105% for the six months ended June 30, 2026 and 2025, respectively. The increase as a percentage of revenue is primarily due to an increase in compensation and benefits and fuel expense coupled with a decrease in utilization, resulting in a higher ratio of fixed costs to variable costs.
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Natural Sand Proppant Services. Natural sand proppant services cost of revenue, exclusive of depreciation, depletion and accretion, increased $1.5 million, or 14%, to $12.2 million for the six months ended June 30, 2026 compared to $10.7 million for the same period in 2025. As a percentage of revenue, cost of revenue, exclusive of depreciation, depletion and accretion of $1.1 million and $2.3 million for the six months ended June 30, 2026 and 2025, respectively, was 103% and 88% for the six months ended June 30, 2026 and 2025, respectively. The increase in cost as a percentage of revenue is primarily due to an 11% decrease in tons sold and a 4% decrease in average sales price per ton.
Accommodation Services. Accommodation services cost of revenue, exclusive of depreciation and accretion, increased $1.6 million, or 59%, to $4.3 million for the six months ended June 30, 2026 compared to $2.7 million for the same period in 2025. The increase reflected higher operating activity associated with increased occupancy levels. As a percentage of revenue, cost of revenue, exclusive of depreciation and accretion of $0.6 million and $0.5 million for the six months ended June 30, 2026 and 2025, respectively, was 64% and 71% for the six months ended June 30, 2026 and 2025, respectively. Operating costs increased to support higher customer activity; however, revenue growth outpaced the increase in operating costs, resulting in improved operating leverage and greater absorption of fixed facility costs.
Drilling Services. Drilling services cost of revenue, exclusive of depreciation, increased $3.0 million, or 250%, to $4.2 million for the six months ended June 30, 2026 compared to $1.2 million for the same period in 2025. As a percentage of revenue, cost of revenue, exclusive of depreciation of an immaterial amount and $0.1 million for the six months ended June 30, 2026 and 2025, was 81% and 133% for the six months ended June 30, 2026 and 2025, respectively. The decrease as a percentage of revenue is primarily due to an increase in utilization, resulting in a lower ratio of fixed costs to variable costs.
Other Services. Other services cost of revenue, exclusive of depreciation, decreased $0.9 million to $0.5 million for the six months ended June 30, 2026 compared to $1.4 million for the same period in 2025. The decrease is primarily due to lower compensation and benefits expense and reduced insurance costs associated with non-operating legacy services.
Selling, General and Administrative. Selling, general and administrative expense decreased $1.3 million, or 14%, to $7.8 million for the six months ended June 30, 2026 compared to $9.1 million for the same period in 2025. The decrease was primarily attributable to reduced corporate and professional costs. SG&A expense represented 16% of revenue during the six months ended June 30, 2026 compared to 38% during the prior-year period, reflecting the Company’s ability to leverage its fixed overhead structure as revenue increased.
Depreciation, Depletion, Amortization and Accretion. Depreciation, depletion, amortization and accretion increased $3.2 million to $8.1 million for the six months ended June 30, 2026 from $4.9 million for the same period in 2025. The increase is primarily attributable to increased depreciation of property, plant and equipment resulting from aviation assets being placed into service during the six months ended June 30, 2026.
Gains on Disposal of Assets, Net. Net gains on the disposal of assets were $5.3 million and $4.5 million for the six months ended June 30, 2026 and 2025, respectively. Gains on the disposal of assets is primarily related to the sale of drilling rigs for the six months ended June 30, 2026 and trucks and field equipment for the same period in 2025.
Impairment of Long-Lived Assets. During the six months ended June 30, 2025, the Company’s management made the decision to market assets related to its natural sand proppant operations at its Piranha Proppant LLC and Muskie Proppant LLC processing plants. As a result, the Company recognized impairment expense on these assets totaling $31.7 million during the six months ended June 30, 2025. There was no similar activity during the six months ended June 30, 2026.
Operating Income (Loss). We reported operating income of $1.8 million for the six months ended June 30, 2026 compared to an operating loss of $38.3 million for the same period in 2025. The increase in operating income was primarily due to $31.7 million in impairment expense recognized during the six months ended June 30, 2025 with no similar activity during the six months ended June 30, 2026.
Interest (Expense) Income, Net. Interest expense, net of interest income was $0.3 million for the six months ended June 30, 2026 compared to interest income, net of interest expense of $0.4 million for the same period in 2025. The increase in interest expense is primarily due to a one time charge of $1.2 million of unamortized debt issuance costs during the six months ended June 30, 2026 in relation to the new credit agreement.
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Gain on Marketable Securities, Net. Net gain on marketable securities was $6.0 million for the six months ended June 30, 2026 compared to the prior‑year period in which no marketable securities were held.
Other Expense, Net. We recognized other expense, net of $0.7 million during the six months ended June 30, 2026 compared to $1.0 million for the same period in 2025.
Provision (Benefit) for Income Taxes. We recorded income tax expense of $3.3 million on pre-tax income of $6.8 million for the six months ended June 30, 2026 compared to an income tax benefit of $0.1 million on pre-tax loss of $38.9 million for the same period in 2025. Our effective tax rates were 48.7% and 0.2% for the six months ended June 30, 2026 and 2025, respectively. The increase in the effective tax rate was primarily attributable to changes in valuation allowances, interest and penalties, withholding taxes and other foreign tax items, as well as the change from a pre-tax loss for the six months ended June 30, 2025 to pre-tax income for the six months ended June 30, 2026.
Discontinued Operations. We recorded net income from discontinued operations, net of income taxes totaling $0.9 million during the six months ended June 30, 2026 compared to $47.1 million for the same period in 2025. See Note 4 of the notes to our unaudited condensed consolidated financial statements for a breakout of the results of operations for our discontinued operations.
Non-GAAP Financial Measures
Adjusted EBITDA from Continuing Operations
Adjusted EBITDA from continuing operations is a supplemental non-GAAP financial measure that is used by management and external users of our financial statements, such as industry analysts, investors, lenders and rating agencies. We define Adjusted EBITDA from continuing operations as net income (loss) from continuing operations before depreciation, depletion, amortization and accretion, gains on disposal of assets, net, impairment of long lived assets, equity based compensation, stock based compensation, interest expense (income), net, (loss) gain on marketable securities, net, other (income) expense, net and provision (benefit) for income taxes. We exclude the items listed above from net income (loss) from continuing operations in arriving at Adjusted EBITDA from continuing operations because these amounts can vary substantially from company to company within our industries depending upon accounting methods and book values of assets, capital structures and the method by which the assets were acquired. Adjusted EBITDA from continuing operations should not be considered as an alternative to, or more meaningful than, net income (loss) from continuing operations or cash flows from operating activities as determined in accordance with GAAP or as an indicator of our operating performance or liquidity. Certain items excluded from Adjusted EBITDA from continuing operations are significant components in understanding and assessing a company’s financial performance, such as a company’s cost of capital and tax structure, as well as the historical costs of depreciable assets, none of which are components of Adjusted EBITDA from continuing operations. Our computations of Adjusted EBITDA from continuing operations may not be comparable to other similarly titled measures of other companies. We believe that Adjusted EBITDA from continuing operations is a widely followed measure of operating performance and may also be used by investors to measure our ability to meet debt service requirements.
The following tables provide a reconciliation of Adjusted EBITDA from continuing operations to net income (loss) from continuing operations, the most directly comparable GAAP financial measure for the specified periods (in thousands):
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| Three Months Ended |  | Six Months Ended
| June 30, |  |  |  | June 30,
Reconciliation of net (loss) income from continuing operations to Adjusted EBITDA from continuing operations: | 2026 |  | 2025 |  |  |  | 2026 |  | 2025
Net (loss) income from continuing operations | $ | (1,198) |  |  | $ | (36,523) |  |  |  |  | $ | 3,487 |  |  | $ | (38,770) |
Depreciation, depletion, amortization and accretion | 4,634 |  |  | 2,827 |  |  |  |  | 8,104 |  |  | 4,910 |
Gains on disposal of assets, net | (4,641) |  |  | (1,077) |  |  |  |  | (5,316) |  |  | (4,549) |
Impairment of long-lived assets | — |  |  | 31,669 |  |  |  |  | — |  |  | 31,669 |
Equity based compensation | 544 |  |  | — |  |  |  |  | 544 |  |  | — |
Stock based compensation | — |  |  | 200 |  |  |  |  | — |  |  | 412 |
Interest expense (income), net | 784 |  |  | (298) |  |  |  |  | 270 |  |  | (383) |
Loss (gain) on marketable securities, net | 1,116 |  |  | — |  |  |  |  | (5,987) |  |  | — |
Other (income) expense, net | (471) |  |  | 628 |  |  |  |  | 138 |  |  | 960 |
Provision (benefit) for income taxes | 1,853 |  |  | (934) |  |  |  |  | 3,309 |  |  | (97) |
Adjusted EBITDA from continuing operations | $ | 2,621 |  |  | $ | (3,508) |  |  |  |  | $ | 4,549 |  |  | $ | (5,848) |

Liquidity and Capital Resources
We require capital to fund ongoing operations including maintenance expenditures on our existing fleet of equipment, organic growth initiatives, investments and acquisitions, and the litigation settlement obligations described in Note 18. Commitments and Contingencies of the notes to the unaudited condensed consolidated financial statements and under “Capital Requirements and Sources of Liquidity” below. Our primary sources of liquidity have been cash on hand, borrowings under our revolving credit facility, proceeds from the sale of assets and cash flows from operations. Our primary uses of capital have been for investing in property, plant and equipment used to provide our services and to acquire complementary assets and businesses.
Liquidity
The following table summarizes our liquidity as of the dates indicated (in thousands):

| June 30, |  | December 31,
| 2026 |  | 2025
Cash and cash equivalents | $ | 50,869 |  |  | $ | 101,987 |
Revolving credit facility borrowing base | 25,000 |  |  | 50,000 |
Less letter of credit facilities (environmental remediation) | (2,573) |  |  | (2,573) |
Less letter of credit facilities (insurance programs) | (2,400) |  |  | (2,400) |
Net working capital (less cash, cash equivalents and restricted cash)(a) | 7,712 |  |  | (6,940) |
Total | $ | 78,608 |  |  | $ | 140,074 |

(a)Net working capital (less cash, cash equivalents and restricted cash) is calculated by subtracting total current liabilities, cash and cash equivalents and restricted cash from total current assets.
As of August 4, 2026, we had unrestricted cash on hand of $40.4 million, marketable securities of $27.5 million, no outstanding borrowings under our revolving credit facility, leaving an aggregate of $20.0 million of available borrowing capacity under this facility, after giving effect to $5.0 million of outstanding letters of credit. As of August 4, 2026, we had cash, cash equivalents and marketable securities of $67.9 million.
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Cash Flows
The following table sets forth our cash flows for the periods indicated (in thousands):

| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2026 |  | 2025 |  | 2026 |  | 2025
Net cash used in operating activities from continuing operations | $ | (7,472) |  |  | $ | (7,289) |  |  | $ | (10,224) |  |  | $ | (7,754) |
Net cash provided by (used in) operating activities from discontinued operations | 482 |  |  | (5,236) |  |  | 200 |  |  | (2,059) |
Net cash used in investing activities from continuing operations | (34,719) |  |  | (25,623) |  |  | (45,062) |  |  | (22,392) |
Net cash provided by investing activities from discontinued operations | — |  |  | 117,481 |  |  | 4,581 |  |  | 111,258 |
Net cash used in financing activities from continuing operations | (205) |  |  | (128) |  |  | (670) |  |  | (253) |
Net cash used in financing activities from discontinued operations | — |  |  | (175) |  |  | — |  |  | (3,848) |
Effect of foreign exchange rate on cash | (105) |  |  | 110 |  |  | (111) |  |  | 113 |
Net (decrease) increase in cash, cash equivalents and restricted cash | $ | (42,019) |  |  | $ | 79,140 |  |  | $ | (51,286) |  |  | $ | 75,065 |

Operating Activities from Continuing Operations
Net cash used in operating activities from continuing operations was $10.2 million during the six months of 2026 compared to $7.8 million for the prior-year period. The increase primarily reflected investments in working capital, including increases in accounts receivable and inventories, partially offset by increases in accounts payable and accrued liabilities.
Investing Activities from Continuing Operations
Net cash used in investing activities from continuing operations was $45.1 million during the first six months of 2026, compared to $22.4 million during the prior-year period. The increase primarily reflected aviation fleet purchases, acquisitions and purchases of marketable securities, partially offset by proceeds from asset sales.
The following table summarizes our purchases of property, plant and equipment by segment for the periods indicated (in thousands):

| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2026 |  | 2025 |  | 2026 |  | 2025
Rental services(a) | $ | 41,213 |  |  | $ | 26,821 |  |  | $ | 50,548 |  |  | $ | 26,940 |
Infrastructure services(b) | 900 |  |  | — |  |  | 2,835 |  |  | 110 |
Natural sand proppant services(c) | 1,001 |  |  | — |  |  | 1,236 |  |  | 93 |
Accommodation services(c) | 158 |  |  | 58 |  |  | 359 |  |  | 75 |
Drilling services(c) | 691 |  |  | 19 |  |  | 691 |  |  | 116 |
Total purchases of property, plant and equipment | $ | 43,963 |  |  | $ | 26,898 |  |  | $ | 55,669 |  |  | $ | 27,334 |

(a) Capital expenditures primarily for expansion of our aviation rental fleet and equipment rental purchases for the three months ended June 30, 2026 and six months ended June 30, 2025.
(b) Capital expenditures primarily for equipment for our fiber optic fleets for the periods presented.
(c) Capital expenditures primarily for equipment for the periods presented.
Financing Activities from Continuing Operations
Net cash used in financing activities from continuing operations was $0.7 million during the six months of 2026, compared to $0.3 million during the prior-year period. The increase primarily related to repurchases of common stock and payments on finance lease obligations.
Net Working Capital
Our net working capital totaled $70.5 million and $107.1 million at June 30, 2026 and December 31, 2025, respectively. Our unrestricted cash balances were $50.9 million and $102.0 million at June 30, 2026 and December 31, 2025, respectively.
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Revolving Credit Facility
Refer to Note 10 of the notes to the unaudited condensed consolidated financial statements for a description of the revolving credit facility. At June 30, 2026, the facility was undrawn and provided $20.0 million of remaining borrowing capacity after letters of credit.
Repurchase Program Authorization
On August 10, 2023, our board of directors approved a stock repurchase program pursuant to which we would be
authorized to repurchase up to the lesser of $55 million or 10 million shares of our common stock, subject to the factors discussed below. Any stock repurchases under this program may be made opportunistically from time to time in open market or privately negotiated transactions in compliance with Rule 10b-18 under the Securities Act of 1934, as amended, including any 10b5-1 plan, and will be subject to market conditions, applicable legal and contractual restrictions, liquidity requirements and other factors. The repurchase program has no time limit, does not require us to repurchase any specific number of shares and may be suspended from time to time, modified or discontinued by our board of directors at any time. Any common stock repurchased as part of such stock repurchase program will be cancelled and retired. We have repurchased and retired 230,730 shares of our common stock for approximately $0.5 million under the stock repurchase program during the six months ended June 30, 2026.
Capital Requirements and Sources of Liquidity
We expect cash on hand, marketable securities, operating cash flows and available borrowing capacity to be sufficient to fund anticipated capital expenditures, working capital requirements and other obligations. During the six months ended June 30, 2026, capital expenditures totaled $55.7 million. For 2026, excluding aviation acquisitions, capital expenditures are currently expected to total approximately $32.5 million. We continue to evaluate acquisition opportunities and may use cash, debt, equity or a combination thereof to finance future transactions.
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Item 3. Quantitative and Qualitative Disclosures About Market Risk
There have been no material changes to the market risks disclosed in Item 7A of our Annual Report on Form 10-K for the year ended December 31, 2025 except as described below.
Interest Rate Risk
At June 30, 2026, we had no borrowings outstanding under our revolving credit facility. Accordingly, we had limited exposure to changes in interest rates.
Marketable Securities Risk
As of June 30, 2026, the recorded fair value of our equity investments in publicly traded companies was $26.1 million. These investments are subject to market price volatility, and current global economic conditions add further uncertainty. However, our holdings are concentrated in publicly traded equity securities. Accordingly, we believe that a meaningful sensitivity analysis is not practicable. Because these securities are measured at fair value, changes in market prices are recognized in earnings each reporting period. As a result, future reported earnings may be materially affected by unrealized gains and losses associated with these investments, which may not be indicative of realized investment results or our underlying operating performance.
Foreign Currency Risk
Our remote accommodation services segment generates revenue and incurs expenses that are denominated in the Canadian dollar. These transactions could be materially affected by currency fluctuations. Changes in currency exchange rates could adversely affect our consolidated results of operations or financial position. We also maintain cash balances denominated in the Canadian dollar. At June 30, 2026, we had $6.2 million of cash, in Canadian dollars, in Canadian accounts. A 10% increase in the strength of the Canadian dollar versus the U.S. dollar would have resulted in an increase in pre-tax income of approximately $0.2 million as of June 30, 2026. We have not hedged our exposure to changes in foreign currency exchange rates and, as a result, could incur unanticipated translation gains and losses.
Customer Credit Risk
See Note 2 and Note 18 of the notes to the unaudited condensed consolidated financial statements for additional discussion of PREPA-related credit exposure.
Item 4. Controls and Procedures
Evaluation of Disclosure Control and Procedures
Under the direction of our Chief Operating Officer and Chief Financial Officer, we have established disclosure controls and procedures, as defined in Rule 13a-15(e) and 15d-15(e) under the Exchange Act, that are designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. The disclosure controls and procedures are also intended to ensure that such information is accumulated and communicated to management, including our Chief Operating Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosures. In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives. In addition, the design of disclosure controls and procedures must reflect the fact that there are resource constraints and that management is required to apply judgment in evaluating the benefits of possible controls and procedures relative to their costs.
At June 30, 2026, an evaluation was performed under the supervision and with the participation of management, including our Chief Operating Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures pursuant to Rule 13a-15(b) under the Exchange Act. Based upon our evaluation, our Chief Operating Officer and Chief Financial Officer have concluded that at June 30, 2026, our disclosure controls and procedures are effective.
Changes in Internal Control Over Financial Reporting
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There was no change in our internal control over financial reporting (as defined in Rules 13a-15(d) and 15d-15(d) under the Exchange Act) that occurred during the quarter ended June 30, 2026 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.
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PART II. OTHER INFORMATION
Item 1. Legal Proceedings
Due to the nature of our business, we are, from time to time, involved in litigation or subject to disputes or claims related to our business activities, including breaches of contractual obligations, workers’ compensation claims, employment related disputes, arbitrations, class actions and other litigation. We are also involved, from time to time, in reviews, investigations, subpoenas and other proceedings (both formal and informal) by governmental agencies regarding our business (collectively, “regulatory matters”), which regulatory matters, if determined adversely to us, could subject us to significant fines, penalties, obligations to change our business practices or other requirements resulting in increased expenses, diminished income and damage to our reputation. In the opinion of our management, none of the pending litigation, disputes or claims against us is expected to have a material adverse effect on our financial condition, cash flows or results of operations, except as disclosed in Note 18. Commitments and Contingencies of the notes to the unaudited condensed consolidated financial statements.
Item 1A. Risk Factors
There have been no material changes to the risk factors previously disclosed in Item 1A. Risk Factors in our Annual Report on Form 10-K filed with the SEC on March 6, 2026. For a discussion of the trends and uncertainties impacting our business and risks associated with the Settlement Agreement with PREPA, see also “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Overview of Our Industries—.”
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds
The number of shares of common stock repurchased and retired by us during the three months ended June 30, 2026 is set forth below.

| Total Number of Shares Purchased |  | Average Price Paid per Share(1) |  | Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (2) |  | Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plans or Programs (2)
April 1 - April 30, 2026 | — |  | — |  | — |  | $ | 54,595,741 |
May 1 - May 31, 2026 | — |  | — |  | — |  | $ | 54,595,741 |
June 1 - June 30, 2026 | 43,062 |  |  | $ | 2.99 |  |  | 43,062 |  |  | $ | 54,466,485 |
Total | 43,062 |  |  |  |  | 43,062 |  |  |

(1) | Excludes excise tax on common stock repurchases and retirements, which is included as part of the cost basis of the shares acquired.
(2) | On August 10, 2023, the Company’s Board of Directors approved a stock repurchase program authorizing the Company to repurchase up to the lesser of $55 million or 10 million shares of its common stock. The repurchase program has no stated expiration date and may be suspended, modified, or discontinued at any time. All shares repurchased under the program are cancelled and retired.

Item 3. Defaults Upon Senior Securities
Not applicable.
Item 4. Mine Safety Disclosures
See our Annual Report on Form 10-K for the year ended December 31, 2025 for a discussion of the regulatory framework governing our mining operations. Required quarterly mine safety disclosures are included in Exhibit 95.1.
Item 5. Other Information
None of our directors or officers adopted or terminated a Rule 10b5-1 trading arrangement or a non-Rule 10b5-1 trading arrangement during the second quarter ended June 30, 2026.
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MAMMOTH ENERGY SERVICES, INC.
Item 6. Exhibits
The following exhibits are filed as a part of this report:

|  |  |  | Incorporated By Reference |  |  |
Exhibit Number |  | Exhibit Description |  | Form |  | Commission File No. |  | Filing Date |  | Exhibit No. |  | Filed Herewith | Furnished Herewith
3.1 |  | Amended and Restated Certificate of Incorporation of the Company |  | 8-K |  | 001-37917 |  | 11/15/2016 |  | 3.1 |  |  |
3.2 |  | Amended and Restated Bylaws of the Company |  | 8-K |  | 001-37917 |  | 11/15/2016 |  | 3.2 |  |  |
3.3 |  | First Amendment to Amended and Restated Bylaws of the Company |  | 8-K |  | 001-37917 |  | 6/9/2020 |  | 3.1 |  |  |
4.1 |  | Specimen Certificate for shares of common stock, par value $0.01 per share, of the Company |  | S-1/A |  | 333-213504 |  | 10/3/2016 |  | 4.1 |  |  |
4.2 |  | Registration Rights Agreement, dated October 12, 2016, by and between the Company and Mammoth Energy Holdings, LLC |  | 8-K |  | 001-37917 |  | 11/15/2016 |  | 4.1 |  |  |
10.1 |  | N493SA Aircraft Lease Agreement, dated as of June 2, 2026 by and between Cobra Aviation Services LLC and Executive Express Aviation LLC. |  |  |  |  |  |  |  |  |  | X |
10.2 |  | N258AW Aircraft Lease Agreement, dated as of July 28, 2026 by and between Cobra Aviation Services LLC and Executive Express Aviation LLC. |  |  |  |  |  |  |  |  |  | X |
31.1 |  | Certification of Chief Operating Officer pursuant to Rule 13(a)-14 and 15(d)-14 under the Securities Exchange Act of 1934. |  |  |  |  |  |  |  |  |  | X |
31.2 |  | Certification of Chief Financial Officer pursuant to Rule 13(a)-14 and 15(d)-14 under the Securities Exchange Act of 1934. |  |  |  |  |  |  |  |  |  | X |
32.1 |  | Certification of Chief Operating Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. |  |  |  |  |  |  |  |  |  | X |
32.2 |  | Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. |  |  |  |  |  |  |  |  |  | X |
95.1 |  | Mine Safety Disclosure Exhibit |  |  |  |  |  |  |  |  |  | X |
101.INS |  | XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document. |  |  |  |  |  |  |  |  |  | X |
101.SCH |  | XBRL Taxonomy Extension Schema Document. |  |  |  |  |  |  |  |  |  | X |
101.CAL |  | XBRL Taxonomy Extension Calculation Linkbase Document. |  |  |  |  |  |  |  |  |  | X |
101.DEF |  | XBRL Taxonomy Extension Definition Linkbase Document. |  |  |  |  |  |  |  |  |  | X |
101.LAB |  | XBRL Taxonomy Extension Labels Linkbase Document. |  |  |  |  |  |  |  |  |  | X |
101.PRE |  | XBRL Taxonomy Extension Presentation Linkbase Document. |  |  |  |  |  |  |  |  |  | X |
104 |  | Cover Page Interactive Data File - the cover page interactive data file does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document. |  |  |  |  |  |  |  |  |  | X |

48

MAMMOTH ENERGY SERVICES, INC.
Signatures
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: | August 7, 2026 |  | By: |  | /s/ Bernard Lancaster
|  |  |  |  | Bernard Lancaster
|  |  |  |  | Chief Operating Officer and Principal Executive Officer
Date: | August 7, 2026 |  | By: |  | /s/ Mark Layton
|  |  |  |  | Mark Layton
|  |  |  |  | Chief Financial Officer and Principal Financial Officer

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