NATURAL GAS SERVICES GROUP INC

9. Supplemental Balance Sheet Disclosures

The following table summarizes the components of accrued liabilities as of the dates presented:

10. Long-Term Debt

Our outstanding long-term debt consists of the following as of the dates presented:

We have a senior secured revolving credit agreement, as amended (the “Credit Facility”) with Texas Capital Bank, National Association as administrative agent (the “Administrative Agent”), TCBI Securities, Inc., Bank of America, N.A., and the Huntington National Bank as joint lead arrangers and joint book runners, and the lenders party thereto (the “Lenders”). On April 18, 2025, we entered into the Fourth Amendment to the Amended and Restated Credit Agreement (the “Fourth Amendment”) with the Lenders to (i) increase the total commitment to $400.0 million from $300.0 million, (ii) expand the accordion feature to $100.0 million from $50.0 million, (iii) reduce the interest rates by 50 to 75 basis points at comparable leverage levels and, (iv) provide for a more flexible leverage covenant that began on September 30, 2025. In connection with the Fourth Amendment, we incurred fees and debt issue costs of $1.3 million.

The Credit Facility provides for a total commitment of $400.0 million. We also have a right to request from the Lenders, an increase to the potential aggregate commitment of up to $100.0 million; provided, however, the aggregate commitment amount is not permitted to exceed $500.0 million. The accordion feature is subject to certain conditions, including the absence of a default, the consent of new or existing lenders willing to provide additional commitments, and our pro forma compliance with the Credit Facility’s financial covenants. The obligations under the Credit Facility are secured by a first priority lien on most of our assets, including inventory and certain accounts receivable as well as a variable number of our leased compressor units. The maturity date of the Credit Facility is February 28, 2028.

As of December 31, 2025, we had $230.0 million outstanding under our Credit Facility with a weighted average interest rate of 6.59%. As of December 31, 2025, we had approximately $170.0 million available for borrowing under the Credit Facility, subject to borrowing base determination that was determined to be $400.0 million. As of December 31, 2025, we were in compliance with all financial covenants in our Credit Facility.

Borrowing Base. At any time before the maturity of the Credit Facility, we may draw, repay and re-borrow amounts available under the borrowing base up to the maximum aggregate availability discussed above. Generally, the borrowing base equals the sum of (a)85% of eligible accounts receivable owed to us, plus (b)50% of the eligible inventory, valued at the lower of cost or market value at such time, subject to a cap of this component not to exceed $2.5 million, plus (c) the lesser of (i)95% of the net book value of the compressors that the Administrative Agent has determined are eligible for the extension of credit, valued at the lower of cost or market value with depreciation not to exceed 25 years, at such time and (ii)80% of the net liquidation value percentage of the net book value of the eligible compressors that the Administrative Agent has determined are eligible for the extension of credit, valued at the lower of cost or market value with depreciation not to exceed 25 years, at such time, plus (d)80% of the net book value, valued at the lower of cost (excluding any costs for capitalized interest or other noncash capitalized costs) or market of the eligible new compressor fleet, minus (e) any required availability reserves determined by the Administrative Agent in its sole discretion. The Administrative Agent may adjust the borrowing base components if material deviations in the collateral are discovered in future audits of the collateral.

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Interest and Fees. Under the terms of the Credit Facility, we have the option of selecting the applicable variable rate for each revolving loan, or portion thereof, of either (a) the Base Rate (as defined below) plus the Applicable Margin, or (b) in the case of a Term Secured Overnight Financing Rate (“SOFR”) Loan, the Adjusted Term SOFR rate plus the Applicable Margin. “Base Rate” means, for any day, a rate of interest per annum equal to the highest of (a) the prime rate for such day; (b) the sum of the federal funds rate for such day plus 0.50%; and (c) the Adjusted Term SOFR for such day plus 1.00%. The Applicable Margin is determined based upon the leverage ratio as set forth in the most recent compliance certificate received by the Administrative Agent for each fiscal quarter from time to time pursuant to the Credit Facility. Depending on the leverage ratio, the Applicable Margin can be 1.50% to 2.25% for Base Rate Loans (as defined in the Credit Facility) and 2.50% to 3.25% for Term SOFR Loans and for requested letters of credit. In addition, we are required to pay a monthly commitment fee on the daily average unused amount of the commitment while the Credit Facility is in effect at an annual rate equal to 0.375% of the unused commitment amount. Accrued interest is payable monthly on outstanding principal amounts and unused commitment fee, provided that accrued interest on Term SOFR Loans is payable at the end of each interest period, but in no event less frequently than quarterly.

Covenants. The Credit Facility contains customary representations and warranties, as well as covenants which, among other things, condition or limit our ability to incur additional indebtedness and liens; enter into transactions with affiliates; make acquisitions in excess of certain amounts; pay dividends; redeem or repurchase capital stock or senior notes; make investments or loans; make negative pledges; consolidate, merge or effect asset sales; or change the nature of our business. In addition, we are subject to certain financial covenants in the Credit Facility that require us to maintain (i) a leverage ratio, as defined, lesser than or equal to (a)3.50 to 1.00 for each fiscal quarter and (ii) a fixed charge coverage ratio greater than or equal to 1.25 to 1.00 as of the last day of each fiscal quarter.

Events of Default and Acceleration. The Credit Facility contains customary events of default for credit facilities of this size and type, and includes, without limitation, payment defaults; defaults in performance of covenants or other agreements contained in the Credit Facility and the other transaction documents; inaccuracies in representations and warranties; certain defaults, termination events or similar events; certain defaults with respect to any other Company indebtedness in excess of $1.0 million; certain bankruptcy or insolvency events; the rendering of certain judgments in excess of $1.0 million; certain ERISA events; certain change in control events and the defectiveness of any liens. Obligations outstanding under the Credit Facility may be accelerated upon the occurrence of an event of default.

11. Income Taxes

The following table summarizes our provision for income taxes for the presented:

The following table summarizes the effective tax rates for the periods presented:

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The following table summarizes the income tax effects of temporary differences that give rise to significant portions of deferred income tax assets and (liabilities) as of the dates presented:

We file income tax returns in the U.S. federal jurisdiction and various state jurisdictions. With few exceptions, we are no longer subject to U.S. federal or state income tax examination by tax authorities for years before 2020.

Income Taxes Receivable

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) was enacted in response to the economic impact caused by the COVID-19 pandemic. The CARES Act, among other things, permits federal income tax net operating loss (“NOL”) carryovers and carrybacks to offset 100% of taxable income for taxable years beginning before 2021. In addition, the CARES Act allows NOLs incurred in 2018, 2019, and 2020 to be carried back to each of the five preceding taxable years to generate a refund of previously paid federal income taxes. We generated significant NOLs during 2018 and 2019 and filed carryback claims for these losses to the preceding five years.

In connection with the filing of these claims, we initially recorded a federal income tax receivable of approximately $15.0 million and certain related adjustments to our deferred tax liability. We subsequently received federal income tax refunds corresponding to the 2018 NOL carryback during 2020 leaving approximately $11.5 million remaining to be refunded in connection with the 2019 NOL carryback. In conjunction with the remaining income tax refund claim, we received a notice from the Internal Revenue Service (“IRS”) on March 8, 2023, stating that our income tax returns for 2015, 2016, 2017 and 2019 were selected for examination. Furthermore, and as is customary for income tax refunds of this magnitude, the IRS was required to review the refund claim and provide a report to the Joint Committee on Taxation of the U.S. Congress (“JCT”). As a result of the submission of the refund claim to the JCT, the IRS completed their review of the income tax returns for 2015, 2016 and 2017. Our request for refund was reviewed and concluded favorably with the JCT concurring with the IRS’s conclusions. Subsequent to a delay due to the federal government shutdown in October 2025, we received a total of $12.3 million in the first quarter of 2026. This amount includes tax refunds of $10.2 million and related interest of $2.1 million for the years 2015, 2016 and 2017. After receipt of these refunds, a total of $1.8 million attributable solely to 2019 remains open including an income tax refund of $1.5 million plus interest of $0.3 million.

Other Income Tax Attributes

As of December 31, 2025, we had NOL carryforwards for federal income tax purposes of $124.2 million, which may be carried forward indefinitely and can offset up to 80% of future taxable income in any given year. Future changes in ownership, as defined by Section 382 of the Internal Revenue Code of 1986, as amended (“IRC”), could limit the amount of NOL carryforwards used in any one year. In general, under Section 382 and 383 of the IRC, a corporation that undergoes an “ownership change” is subject to limitations on its ability to utilize its pre-change NOLs and certain tax credits, to offset future taxable income and tax. In general, an ownership change occurs if the aggregate stock ownership of certain stockholders changes by more than 50 percentage points over such stockholders’ lowest percentage of ownership during the testing period (generally three years). We also had state NOL carryforwards of $58.5 million with carryforward periods similar to those of our federal NOLs.

We paid a total of $0.3 million during 2025for income taxes, net of refunds received, including $0.1 million to the IRS and $0.1 million to the State of Texas. We haveno reserves for uncertain tax positions as of December 31, 2025 and 2024.

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12. Deferred Compensation Plan

We maintain a non-qualified deferred compensation plan (the “Deferred Compensation Plan”) for executive officers, directors and certain eligible employees. The assets of the Deferred Compensation Plan are held in a rabbi trust and are subject to additional risk of loss in the event of bankruptcy or insolvency of the Company. The Deferred Compensation Plan allows for deferral of up to 90 percent of a participant’s base salary, bonus, commissions, director fees and restricted stock and unit awards. Company owned life insurance (“COLI”) policies are held in the rabbi trust are utilized as a source of funding for the Deferred Compensation Plan. The cash surrender value of the COLI policies was $2.9 million and $3.0 million as of December 31, 2025 and 2024, respectively, with unrealized gains and (losses) related to the policies of $0.1 million, $0.2 million and $(0.2) million recorded as a component of Other income (expense) in our Consolidated Statements of Operations for the years ended December 31, 2025, 2024 and 2023, respectively.

For deferrals of base salary, bonus, commissions and director fees, settlement payments are made to participants in cash, either in a lump sum or in periodic installments. The obligations to pay the deferred compensation and the deferred director fees are adjusted to reflect the positive or negative performance of investment measurement options selected by each participant and was $3.2 million and $3.8 million as of December 31, 2025 and 2024, respectively. The deferred obligations are included as a component of Other long-term liabilities on our Consolidated Balance Sheets.

For deferrals of restricted stock awards, the Deferred Compensation Plan does not allow for diversification, therefore, distributions are paid in shares of our common stock and the obligations are carried at their grant date fair values. As of December 31, 2025 and 2024, respectively, there wereno unvested restricted stock and units being deferred. As of December 31, 2025 and 2024, respectively we have released and issued 140,115 and 191,700 shares to the Deferred Compensation Plan with a value of $4.7 million and $4.8 million, respectively.