0001084991--12-31 2025 Q2 FALSE 411 xbrli:shares iso4217:USD iso4217:USD xbrli:shares ngs:segment xbrli:pure ngs:employee ngs:plan 0001084991 2025-01-01 2025-06-30 0001084991 2025-08-08 0001084991 2025-06-30 0001084991 2024-12-31 0001084991 2025-04-01 2025-06-30 0001084991 2024-04-01 2024-06-30 0001084991 2024-01-01 2024-06-30 0001084991 ngs:ProductSalesMember 2025-04-01 2025-06-30 0001084991 ngs:ProductSalesMember 2024-04-01 2024-06-30 0001084991 ngs:ProductSalesMember 2025-01-01 2025-06-30 0001084991 ngs:ProductSalesMember 2024-01-01 2024-06-30 0001084991 ngs:AftermarketServicesMember 2025-04-01 2025-06-30 0001084991 ngs:AftermarketServicesMember 2024-04-01 2024-06-30 0001084991 ngs:AftermarketServicesMember 2025-01-01 2025-06-30 0001084991 ngs:AftermarketServicesMember 2024-01-01 2024-06-30 0001084991 us-gaap:PreferredStockMember 2023-12-31 0001084991 us-gaap:CommonStockMember 2023-12-31 0001084991 us-gaap:AdditionalPaidInCapitalMember 2023-12-31 0001084991 us-gaap:RetainedEarningsMember 2023-12-31 0001084991 us-gaap:TreasuryStockCommonMember 2023-12-31 0001084991 2023-12-31 0001084991 us-gaap:AdditionalPaidInCapitalMember 2024-01-01 2024-03-31 0001084991 2024-01-01 2024-03-31 0001084991 us-gaap:CommonStockMember 2024-01-01 2024-03-31 0001084991 us-gaap:RetainedEarningsMember 2024-01-01 2024-03-31 0001084991 us-gaap:PreferredStockMember 2024-03-31 0001084991 us-gaap:CommonStockMember 2024-03-31 0001084991 us-gaap:AdditionalPaidInCapitalMember 2024-03-31 0001084991 us-gaap:RetainedEarningsMember 2024-03-31 0001084991 us-gaap:TreasuryStockCommonMember 2024-03-31 0001084991 2024-03-31 0001084991 us-gaap:AdditionalPaidInCapitalMember 2024-04-01 2024-06-30 0001084991 us-gaap:CommonStockMember 2024-04-01 2024-06-30 0001084991 us-gaap:RetainedEarningsMember 2024-04-01 2024-06-30 0001084991 us-gaap:PreferredStockMember 2024-06-30 0001084991 us-gaap:CommonStockMember 2024-06-30 0001084991 us-gaap:AdditionalPaidInCapitalMember 2024-06-30 0001084991 us-gaap:RetainedEarningsMember 2024-06-30 0001084991 us-gaap:TreasuryStockCommonMember 2024-06-30 0001084991 2024-06-30 0001084991 us-gaap:PreferredStockMember 2024-12-31 0001084991 us-gaap:CommonStockMember 2024-12-31 0001084991 us-gaap:AdditionalPaidInCapitalMember 2024-12-31 0001084991 us-gaap:RetainedEarningsMember 2024-12-31 0001084991 us-gaap:TreasuryStockCommonMember 2024-12-31 0001084991 us-gaap:AdditionalPaidInCapitalMember 2025-01-01 2025-03-31 0001084991 2025-01-01 2025-03-31 0001084991 us-gaap:CommonStockMember 2025-01-01 2025-03-31 0001084991 us-gaap:RetainedEarningsMember 2025-01-01 2025-03-31 0001084991 us-gaap:PreferredStockMember 2025-03-31 0001084991 us-gaap:CommonStockMember 2025-03-31 0001084991 us-gaap:AdditionalPaidInCapitalMember 2025-03-31 0001084991 us-gaap:RetainedEarningsMember 2025-03-31 0001084991 us-gaap:TreasuryStockCommonMember 2025-03-31 0001084991 2025-03-31 0001084991 us-gaap:AdditionalPaidInCapitalMember 2025-04-01 2025-06-30 0001084991 us-gaap:CommonStockMember 2025-04-01 2025-06-30 0001084991 us-gaap:RetainedEarningsMember 2025-04-01 2025-06-30 0001084991 us-gaap:PreferredStockMember 2025-06-30 0001084991 us-gaap:CommonStockMember 2025-06-30 0001084991 us-gaap:AdditionalPaidInCapitalMember 2025-06-30 0001084991 us-gaap:RetainedEarningsMember 2025-06-30 0001084991 us-gaap:TreasuryStockCommonMember 2025-06-30 0001084991 ngs:RentalMember 2025-06-30 0001084991 ngs:RentalMember 2024-12-31 0001084991 ngs:SalesAndAftermarketServicesMember 2025-06-30 0001084991 ngs:SalesAndAftermarketServicesMember 2024-12-31 0001084991 ngs:OxyMember us-gaap:CustomerConcentrationRiskMember ngs:SalesRevenueGoodsNetAndRentalIncomeMember 2025-01-01 2025-06-30 0001084991 ngs:OxyMember us-gaap:CustomerConcentrationRiskMember ngs:SalesRevenueGoodsNetAndRentalIncomeMember 2024-01-01 2024-06-30 0001084991 ngs:OxyMember us-gaap:CustomerConcentrationRiskMember us-gaap:AccountsReceivableMember 2025-01-01 2025-06-30 0001084991 ngs:OxyMember us-gaap:CustomerConcentrationRiskMember us-gaap:AccountsReceivableMember 2024-01-01 2024-12-31 0001084991 2024-01-01 2024-12-31 0001084991 us-gaap:LandAndBuildingMember 2025-06-30 0001084991 2025-04-01 2025-04-30 0001084991 ngs:RentalCompressorUnitMember 2025-06-30 0001084991 ngs:RentalCompressorUnitMember 2024-12-31 0001084991 ngs:RentalCompressorUnitWorkInProgressMember 2025-06-30 0001084991 ngs:RentalCompressorUnitWorkInProgressMember 2024-12-31 0001084991 ngs:RentalEquipmentMember 2025-04-01 2025-06-30 0001084991 ngs:RentalEquipmentMember 2024-04-01 2024-06-30 0001084991 ngs:RentalEquipmentMember 2025-01-01 2025-06-30 0001084991 ngs:RentalEquipmentMember 2024-01-01 2024-06-30 0001084991 us-gaap:LandMember 2025-06-30 0001084991 us-gaap:LandMember 2024-12-31 0001084991 us-gaap:BuildingMember 2025-06-30 0001084991 us-gaap:BuildingMember 2024-12-31 0001084991 us-gaap:LeaseholdImprovementsMember 2025-06-30 0001084991 us-gaap:LeaseholdImprovementsMember 2024-12-31 0001084991 ngs:OfficeEquipmentAndFurnitureMember 2025-06-30 0001084991 ngs:OfficeEquipmentAndFurnitureMember 2024-12-31 0001084991 us-gaap:SoftwareAndSoftwareDevelopmentCostsMember 2025-06-30 0001084991 us-gaap:SoftwareAndSoftwareDevelopmentCostsMember 2024-12-31 0001084991 us-gaap:MachineryAndEquipmentMember 2025-06-30 0001084991 us-gaap:MachineryAndEquipmentMember 2024-12-31 0001084991 us-gaap:VehiclesMember 2025-06-30 0001084991 us-gaap:VehiclesMember 2024-12-31 0001084991 ngs:WorkInProgressMember 2025-06-30 0001084991 ngs:WorkInProgressMember 2024-12-31 0001084991 ngs:PropertyPlantAndEquipmentExcludingRentalEquipmentMember 2025-04-01 2025-06-30 0001084991 ngs:PropertyPlantAndEquipmentExcludingRentalEquipmentMember 2024-04-01 2024-06-30 0001084991 ngs:PropertyPlantAndEquipmentExcludingRentalEquipmentMember 2025-01-01 2025-06-30 0001084991 ngs:PropertyPlantAndEquipmentExcludingRentalEquipmentMember 2024-01-01 2024-06-30 0001084991 us-gaap:RevolvingCreditFacilityMember 2025-04-18 0001084991 us-gaap:RevolvingCreditFacilityMember 2025-04-17 0001084991 us-gaap:RevolvingCreditFacilityMember 2025-04-18 2025-04-18 0001084991 us-gaap:RevolvingCreditFacilityMember 2025-04-17 2025-04-17 0001084991 2025-04-18 2025-04-18 0001084991 2025-04-18 0001084991 us-gaap:RevolvingCreditFacilityMember 2025-06-30 0001084991 us-gaap:RevolvingCreditFacilityMember 2025-01-01 2025-06-30 0001084991 us-gaap:RevolvingCreditFacilityMember ngs:FederalFundRateMember 2025-01-01 2025-06-30 0001084991 us-gaap:RevolvingCreditFacilityMember us-gaap:SecuredOvernightFinancingRateSofrMember 2025-01-01 2025-06-30 0001084991 us-gaap:RevolvingCreditFacilityMember ngs:BaseRateLoansMember srt:MinimumMember 2025-01-01 2025-06-30 0001084991 us-gaap:RevolvingCreditFacilityMember ngs:BaseRateLoansMember srt:MaximumMember 2025-01-01 2025-06-30 0001084991 us-gaap:RevolvingCreditFacilityMember us-gaap:SecuredOvernightFinancingRateSofrMember srt:MinimumMember 2025-01-01 2025-06-30 0001084991 us-gaap:RevolvingCreditFacilityMember us-gaap:SecuredOvernightFinancingRateSofrMember srt:MaximumMember 2025-01-01 2025-06-30 0001084991 us-gaap:RevolvingCreditFacilityMember 2025-04-01 2025-06-30 0001084991 us-gaap:RevolvingCreditFacilityMember srt:ScenarioForecastMember 2025-07-01 2025-09-30 0001084991 us-gaap:RevolvingCreditFacilityMember srt:MaximumMember 2025-06-30 0001084991 ngs:CompressorRelatedMember 2025-04-01 2025-06-30 0001084991 ngs:CompressorRelatedMember 2024-04-01 2024-06-30 0001084991 ngs:CompressorRelatedMember 2025-01-01 2025-06-30 0001084991 ngs:CompressorRelatedMember 2024-01-01 2024-06-30 0001084991 ngs:OtherPartsRebuildsMember 2025-04-01 2025-06-30 0001084991 ngs:OtherPartsRebuildsMember 2024-04-01 2024-06-30 0001084991 ngs:OtherPartsRebuildsMember 2025-01-01 2025-06-30 0001084991 ngs:OtherPartsRebuildsMember 2024-01-01 2024-06-30 0001084991 ngs:EquityClassifiedAwardsMember 2025-04-01 2025-06-30 0001084991 ngs:EquityClassifiedAwardsMember 2024-04-01 2024-06-30 0001084991 ngs:EquityClassifiedAwardsMember 2025-01-01 2025-06-30 0001084991 ngs:EquityClassifiedAwardsMember 2024-01-01 2024-06-30 0001084991 ngs:LiabilityClassifiedAwardsMember 2025-04-01 2025-06-30 0001084991 ngs:LiabilityClassifiedAwardsMember 2024-04-01 2024-06-30 0001084991 ngs:LiabilityClassifiedAwardsMember 2025-01-01 2025-06-30 0001084991 ngs:LiabilityClassifiedAwardsMember 2024-01-01 2024-06-30 0001084991 ngs:A1998StockOptionPlanMember 2025-06-30 0001084991 ngs:A1998StockOptionPlanMember us-gaap:RestrictedStockMember 2025-06-30 0001084991 ngs:RangeOneMember 2025-01-01 2025-06-30 0001084991 ngs:RangeOneMember 2025-06-30 0001084991 ngs:RangeTwoMember 2025-01-01 2025-06-30 0001084991 ngs:RangeTwoMember 2025-06-30 0001084991 ngs:RangeThreeMember 2025-01-01 2025-06-30 0001084991 ngs:RangeThreeMember 2025-06-30 0001084991 ngs:EquityIncentivePlanMember us-gaap:RestrictedStockMember 2025-06-05 2025-06-05 0001084991 ngs:EquityIncentivePlanMember us-gaap:RestrictedStockMember 2025-06-05 0001084991 ngs:EquityIncentivePlanMember us-gaap:RestrictedStockMember 2025-06-30 0001084991 us-gaap:RestrictedStockMember 2024-12-31 0001084991 us-gaap:RestrictedStockMember 2024-01-01 2024-12-31 0001084991 us-gaap:RestrictedStockMember 2025-01-01 2025-06-30 0001084991 us-gaap:RestrictedStockMember 2025-06-30 0001084991 us-gaap:RestrictedStockMember ngs:CashSettledRSUsMember 2024-12-31 0001084991 us-gaap:RestrictedStockMember ngs:CashSettledRSUsMember 2024-01-01 2024-12-31 0001084991 us-gaap:RestrictedStockMember ngs:CashSettledRSUsMember 2025-01-01 2025-06-30 0001084991 us-gaap:RestrictedStockMember ngs:CashSettledRSUsMember 2025-06-30 0001084991 ngs:ChiefExecutiveOfficerChiefOperatingOfficerAndChiefFinancialOfficerMember us-gaap:PerformanceSharesMember 2025-01-01 2025-06-30 0001084991 us-gaap:PerformanceSharesMember srt:MinimumMember ngs:ChiefExecutiveOfficerAndChiefOperatingOfficerMember 2025-01-01 2025-06-30 0001084991 us-gaap:PerformanceSharesMember srt:MaximumMember ngs:ChiefExecutiveOfficerAndChiefOperatingOfficerMember 2025-01-01 2025-06-30 0001084991 us-gaap:PerformanceSharesMember 2025-01-01 2025-06-30 0001084991 us-gaap:PerformanceSharesMember 2024-12-31 0001084991 us-gaap:PerformanceSharesMember 2024-01-01 2024-12-31 0001084991 us-gaap:PerformanceSharesMember 2025-06-30 0001084991 us-gaap:EmployeeStockOptionMember 2025-04-01 2025-06-30 0001084991 us-gaap:EmployeeStockOptionMember 2024-04-01 2024-06-30 0001084991 us-gaap:EmployeeStockOptionMember 2025-01-01 2025-06-30 0001084991 us-gaap:EmployeeStockOptionMember 2024-01-01 2024-06-30 0001084991 ngs:RestrictedStockAndRestrictedStockUnitsMember 2025-04-01 2025-06-30 0001084991 ngs:RestrictedStockAndRestrictedStockUnitsMember 2024-04-01 2024-06-30 0001084991 ngs:RestrictedStockAndRestrictedStockUnitsMember 2025-01-01 2025-06-30 0001084991 ngs:RestrictedStockAndRestrictedStockUnitsMember 2024-01-01 2024-06-30 0001084991 us-gaap:PerformanceSharesMember 2025-04-01 2025-06-30 0001084991 us-gaap:PerformanceSharesMember 2024-04-01 2024-06-30 0001084991 us-gaap:PerformanceSharesMember 2025-01-01 2025-06-30 0001084991 us-gaap:PerformanceSharesMember 2024-01-01 2024-06-30 0001084991 us-gaap:SubsequentEventMember 2025-07-30 2025-07-30 0001084991 us-gaap:SubsequentEventMember 2025-08-08 0001084991 ngs:StephenC.TaylorMember 2025-04-01 2025-06-30 0001084991 ngs:StephenC.TaylorMember 2025-06-30

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, 2025
OR
☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from ______ to ______
Commission File Number 1-31398
NATURAL GAS SERVICES GROUP, INC.
(Exact name of registrant as specified in its charter)

Colorado |  | 75-2811855
(State or other jurisdiction of incorporation or organization) |  | (I.R.S. Employer Identification No.)

404 Veterans Airpark Ln., Ste 300
Midland, Texas 79705
(Address of principal executive offices)
(432) 262-2700
(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:
Title of each class | Trading Symbol | Name of each exchange on which registered
Common Stock, Par Value $0.01 | NGS | New York Stock Exchange

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 x |  | No o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Yes x |  | No o

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 o | 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 for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.o
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes ☐ |  | No x

As of August 8, 2025 there were 12,542,314 shares of the Registrant’s common stock, $0.01 par value, outstanding.

TABLE OF CONTENTS

|  | Page
Part I - FINANCIAL INFORMATION
Item 1. Financial Statements (unaudited) |  |
Unaudited Condensed Consolidated Balance Sheets |  | 1
Unaudited Condensed Consolidated Statements of Operations |  | 2
Unaudited Condensed Consolidated Statements of Stockholders’ Equity |  | 3
Unaudited Condensed Consolidated Statements of Cash Flows |  | 4
Notes to Unaudited Condensed Consolidated Financial Statements: |  | 5
1.Description of Business |  | 5
2. Summary of Significant Accounting Policies |  | 5
3. Trade Accounts Receivable |  | 6
4. Inventory |  | 6
5. Assets Held for Sale |  | 7
6. Rental Equipment |  | 7
7. Property and Equipment |  | 7
8. Supplemental Balance Sheet Disclosures |  | 8
9. Long-Term Debt |  | 8
10. Income Taxes |  | 9
11. Commitments and Contingencies |  | 10
12. Revenues from Customers |  | 10
13. Stock-Based and Other Long-Term Incentive Compensation |  | 10
14. Earnings per Share |  | 13
15. Subsequent Events |  | 13
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations |  | 15
Item 3. Quantitative and Qualitative Disclosures about Market Risk |  | 27
Item 4. Controls and Procedures |  | 28
Part II - OTHER INFORMATION
Item 1. Legal Proceedings |  | 29
Item 1A. Risk Factors |  | 29
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds |  | 29
Item 3. Defaults Upon Senior Securities |  | 29
Item 4. Mine Safety Disclosures |  | 29
Item 5. Other Information |  | 29
Item 6. Exhibits |  | 30
Signatures |  | 31

PART I – FINANCIAL INFORMATION
Item 1. Financial Statements

NATURAL GAS SERVICES GROUP, INC. CONDENSED CONSOLIDATED BALANCE SHEETS (in thousands, except par value) (unaudited)
| June 30, |  | December 31,
| 2025 |  | 2024
ASSETS |  |  |
Current Assets: |  |  |
Cash and cash equivalents | $ | 325 |  |  | $ | 2,142 |
Trade accounts receivable, net of provision for credit losses | 13,742 |  |  | 15,626 |
Inventory, net of allowance for obsolescence | 18,334 |  |  | 18,051 |
Federal income tax receivable | 11,408 |  |  | 11,282 |
Prepaid expenses and other | 2,846 |  |  | 1,075 |
Assets held for sale | 2,227 |  |  | — |
Total current assets | 48,882 |  |  | 48,176 |
Long-term inventory, net of allowance for obsolescence | — |  |  | — |
Rental equipment, net of accumulated depreciation | 446,952 |  |  | 415,021 |
Property and equipment, net of accumulated depreciation | 22,664 |  |  | 22,989 |
Other assets | 7,028 |  |  | 6,342 |
Total assets | $ | 525,526 |  |  | $ | 492,528 |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |
Current Liabilities: |  |  |
Accounts payable | $ | 14,491 |  |  | $ | 9,670 |
Accrued liabilities | 10,297 |  |  | 7,688 |
Total current liabilities | 24,788 |  |  | 17,358 |
Long-term debt | 182,000 |  |  | 170,000 |
Deferred income taxes | 48,884 |  |  | 45,873 |
Other long-term liabilities | 3,640 |  |  | 4,240 |
Total liabilities | 259,312 |  |  | 237,471 |
Commitments and contingencies (Note 1 1) |  |  |
Stockholders’ Equity: |  |  |
Preferred stock, 5,000 shares authorized, no shares issued or outstanding | — |  |  | — |
Common stock, 30,000 shares authorized, par value $0.01; 13,811 and 13,762 shares issued, respectively | 138 |  |  | 138 |
Additional paid-in capital | 119,530 |  |  | 118,415 |
Retained earnings | 161,550 |  |  | 151,508 |
Treasury shares, at cost, 1,310 shares for each of the dates presented, respectively | (15,004) |  |  | (15,004) |
Total stockholders’ equity | 266,214 |  |  | 255,057 |
Total liabilities and stockholders’ equity | $ | 525,526 |  |  | $ | 492,528 |

See accompanying notes to these unaudited condensed consolidated financial statements.
1

NATURAL GAS SERVICES GROUP, INC. CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (in thousands, except earnings per share) (unaudited)
| Three months ended |  | Six months ended
| June 30, |  | June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Revenue: |  |  |  |  |  |  |
Rental | $ | 39,580 |  |  | $ | 34,926 |  |  | $ | 78,490 |  |  | $ | 68,660 |
Sales | 750 |  |  | 2,270 |  |  | 2,677 |  |  | 4,773 |
Aftermarket services | 1,052 |  |  | 1,295 |  |  | 1,598 |  |  | 1,965 |
Total revenue | 41,382 |  |  | 38,491 |  |  | 82,765 |  |  | 75,398 |
Cost of revenue (excluding depreciation and amortization): |  |  |  |  |  |  |
Rental | 15,528 |  |  | 14,228 |  |  | 30,368 |  |  | 27,342 |
Sales | 911 |  |  | 2,249 |  |  | 2,927 |  |  | 4,429 |
Aftermarket services | 720 |  |  | 1,012 |  |  | 991 |  |  | 1,512 |
Total cost of revenues (excluding depreciation and amortization) | 17,159 |  |  | 17,489 |  |  | 34,286 |  |  | 33,283 |
Selling, general and administrative expense | 5,454 |  |  | 5,020 |  |  | 10,832 |  |  | 9,722 |
Depreciation and amortization | 8,969 |  |  | 7,705 |  |  | 17,605 |  |  | 14,792 |
Inventory allowance | — |  |  | — |  |  | 61 |  |  | — |
Retirement of rental equipment | — |  |  | — |  |  | 728 |  |  | 5 |
Gain on disposition of assets, net | (124) |  |  | (229) |  |  | (178) |  |  | (229) |
Total operating costs and expenses | 31,458 |  |  | 29,985 |  |  | 63,334 |  |  | 57,573 |
Operating income | 9,924 |  |  | 8,506 |  |  | 19,431 |  |  | 17,825 |
Other income (expense): |  |  |  |  |  |  |
Interest expense | (3,243) |  |  | (2,932) |  |  | (6,413) |  |  | (5,867) |
Other income (expense) | 104 |  |  | (30) |  |  | 103 |  |  | 163 |
Total other income (expense), net | (3,139) |  |  | (2,962) |  |  | (6,310) |  |  | (5,704) |
Income before income taxes | 6,785 |  |  | 5,544 |  |  | 13,121 |  |  | 12,121 |
Provision for income taxes | (1,597) |  |  | (1,294) |  |  | (3,079) |  |  | (2,773) |
Net income | $ | 5,188 |  |  | $ | 4,250 |  |  | $ | 10,042 |  |  | $ | 9,348 |
Earnings per share: |  |  |  |  |  |  |
Basic | $ | 0.42 |  |  | $ | 0.34 |  |  | $ | 0.81 |  |  | $ | 0.75 |
Diluted | $ | 0.41 |  |  | $ | 0.34 |  |  | $ | 0.80 |  |  | $ | 0.75 |
Weighted average shares outstanding: |  |  |  |  |  |  |
Basic | 12,483 |  |  | 12,384 |  |  | 12,473 |  |  | 12,392 |
Diluted | 12,625 |  |  | 12,483 |  |  | 12,629 |  |  | 12,484 |

See accompanying notes to these unaudited condensed consolidated financial statements.
2

NATURAL GAS SERVICES GROUP, INC. CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (in thousands) (unaudited)
| Preferred Stock |  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Total Stockholders’ Equity
| Shares |  | Amount |  | Shares |  | Amount |  |  |  | Shares |  | Amount |
January 1, 2024 | — |  |  | $ | — |  |  | 13,688 |  |  | $ | 137 |  |  | $ | 116,480 |  |  | $ | 134,281 |  |  | 1,310 |  |  | $ | (15,004) |  |  | $ | 235,894 |
Stock-based compensation | — |  |  | — |  |  | — |  |  | — |  |  | 274 |  |  | — |  |  | — |  |  | — |  |  | 274 |
Taxes paid related to net shares settlement of equity awards | — |  |  | — |  |  | 6 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net income | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 5,098 |  |  | — |  |  | — |  |  | 5,098 |
March 31, 2024 | — |  |  | $ | — |  |  | 13,694 |  |  | $ | 137 |  |  | $ | 116,754 |  |  | $ | 139,379 |  |  | 1,310 |  |  | $ | (15,004) |  |  | $ | 241,266 |
Stock-based compensation | — |  |  | — |  |  | — |  |  | — |  |  | 242 |  |  | — |  |  | — |  |  | — |  |  | 242 |
Taxes paid related to net shares settlement of equity awards | — |  |  | — |  |  | 33 |  |  | — |  |  | (98) |  |  | — |  |  | — |  |  | — |  |  | (98) |
Net income | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4,250 |  |  | — |  |  | — |  |  | 4,250 |
June 30, 2024 | — |  |  | $ | — |  |  | 13,727 |  |  | $ | 137 |  |  | $ | 116,898 |  |  | $ | 143,629 |  |  | 1,310 |  |  | $ | (15,004) |  |  | $ | 245,660 |

| Preferred Stock |  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Total Stockholders’ Equity
| Shares |  | Amount |  | Shares |  | Amount |  |  |  | Shares |  | Amount |
January 1, 2025 | — |  |  | $ | — |  |  | 13,762 |  |  | $ | 138 |  |  | $ | 118,415 |  |  | $ | 151,508 |  |  | 1,310 |  |  | $ | (15,004) |  |  | $ | 255,057 |
Stock-based compensation | — |  |  | — |  |  | — |  |  | — |  |  | 359 |  |  | — |  |  | — |  |  | — |  |  | 359 |
Vesting of restricted stock/units | — |  |  | — |  |  | 22 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Taxes paid related to net shares settlement of equity awards | — |  |  | — |  |  | — |  |  | — |  |  | (6) |  |  | — |  |  | — |  |  | — |  |  | (6) |
Net income | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4,854 |  |  | — |  |  | — |  |  | 4,854 |
March 31, 2025 | — |  |  | $ | — |  |  | 13,784 |  |  | $ | 138 |  |  | $ | 118,768 |  |  | $ | 156,362 |  |  | 1,310 |  |  | $ | (15,004) |  |  | $ | 260,264 |
Stock-based compensation | — |  |  | — |  |  | — |  |  | — |  |  | 579 |  |  | — |  |  | — |  |  | — |  |  | 579 |
Vesting of restricted stock/units | — |  |  | — |  |  | 22 |  |  | — |  |  | 108 |  |  | — |  |  | — |  |  | — |  |  | 108 |
Exercise of common stock options | — |  |  | — |  |  | 5 |  |  | — |  |  | 75 |  |  | — |  |  | — |  |  | — |  |  | 75 |
Net income | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 5,188 |  |  | — |  |  | — |  |  | 5,188 |
June 30, 2025 | — |  |  | $ | — |  |  | 13,811 |  |  | $ | 138 |  |  | $ | 119,530 |  |  | $ | 161,550 |  |  | 1,310 |  |  | $ | (15,004) |  |  | $ | 266,214 |

See accompanying notes to these unaudited condensed consolidated financial statements.
3

NATURAL GAS SERVICES GROUP, INC. CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (in thousands) (unaudited)
| Six months ended
| June 30,
| 2025 |  | 2024
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ | 10,042 |  |  | $ | 9,348 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 17,605 |  |  | 14,792 |
Inventory allowance | 61 |  |  | — |
Retirement of rental equipment | 728 |  |  | 5 |
Gain on disposition of assets, net | (178) |  |  | (229) |
Amortization of debt issuance costs | 506 |  |  | 315 |
Deferred income taxes | 3,011 |  |  | 2,654 |
Stock-based compensation | 938 |  |  | 516 |
Provision for credit losses | 208 |  |  | 287 |
Gain on company owned life insurance | (17) |  |  | (173) |
Changes in operating assets and liabilities: |  |  |
Trade accounts receivables | 1,676 |  |  | 5,898 |
Inventory | (344) |  |  | 1,149 |
Prepaid expenses and prepaid income taxes | (1,897) |  |  | (825) |
Accounts payable and accrued liabilities | 513 |  |  | (2,993) |
Other | (589) |  |  | 375 |
NET CASH PROVIDED BY OPERATING ACTIVITIES | 32,263 |  |  | 31,119 |
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchase of rental equipment, property and other equipment | (45,065) |  |  | (28,262) |
Purchase of company owned life insurance | — |  |  | (17) |
Proceeds received from insurance for damages to equipment | 99 |  |  | — |
Proceeds from disposition of assets, net | 4 |  |  | 355 |
Proceeds from surrender of company owned life insurance | — |  |  | 43 |
NET CASH USED IN INVESTING ACTIVITIES | (44,962) |  |  | (27,881) |
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from credit facility borrowings | 23,122 |  |  | 8,000 |
Repayments of credit facility borrowings | (11,122) |  |  | (9,000) |
Payments of other long-term liabilities | — |  |  | (385) |
Payments of debt issuance costs | (1,187) |  |  | (885) |
Proceeds from exercise of stock options | 75 |  |  | — |
Taxes paid related to net share settlement of equity awards | (6) |  |  | (98) |
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES | 10,882 |  |  | (2,368) |
NET CHANGE IN CASH AND CASH EQUIVALENTS | (1,817) |  |  | 870 |
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 2,142 |  |  | 2,746 |
CASH AND CASH EQUIVALENTS AT END OF PERIOD | $ | 325 |  |  | $ | 3,616 |
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: |  |  |
Interest paid | $ | 7,037 |  |  | $ | 10,458 |
Income taxes paid | $ | 16 |  |  | $ | — |
NON-CASH TRANSACTIONS: |  |  |
Accrued purchases of property and equipment | $ | 7,254 |  |  | $ | — |
Right of use assets acquired through an finance lease | $ | — |  |  | $ | 1,751 |

See accompanying notes to these unaudited condensed consolidated financial statements.
4

NATURAL GAS SERVICES GROUP, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(in thousands, except per share amounts or where otherwise indicated)
(unaudited)
1. Description of Business
Natural Gas Services Group, Inc. (the “Company,” “NGS,” “Natural Gas Services Group,” “we,” “us” or “our”) (a Colorado corporation), is a leading provider of natural gas and electric compression equipment, technology and services to the energy industry. We rent, design, sell, install, service and maintain compressors and related equipment for our customers’ oil and gas production and processing facilities, generally using equipment from OEM suppliers along with limited in-house assembly. We are headquartered in Midland, Texas, with an assembly facility located in Tulsa, Oklahoma and service facilities located in major oil and gas producing basins in the United States (“U.S.”).
2. Summary of Significant Accounting Policies
Principles of Consolidation and Basis of Presentation
The accompanying unaudited Condensed Consolidated Financial Statements were prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) and include the accounts of the Company, its subsidiary, NGSG Properties, LLC, which owns the Company’s headquarters office building, and the rabbi trust associated with our deferred compensation plan. All significant intercompany accounts and transactions for the periods presented have been eliminated in consolidation.
These financial statements include all adjustments, consisting of normal recurring adjustments, considered necessary for the fair presentation of our financial position as of June 30, 2025, and the results of our operations for the three and six months ended June 30, 2025, and 2024, respectively. As permitted by the rules and regulations of the Securities and Exchange Commission (the “SEC”), the accompanying Condensed Consolidated Financial Statements do not include all disclosures normally required by GAAP. These financial statements should be read in conjunction with the Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2024, as filed with the SEC. In our opinion, the Condensed Consolidated Financial Statements provide a fair representation of our financial position, results of operations, changes in stockholders’ equity and cash flows for the periods presented.
Although we review our service and product offerings to analyze the nature of our revenue, costs and expenses, the net income and non-GAAP financial measures including EBITDA and Adjusted gross margin are not captured or analyzed by these categories. Our chief executive officer (“CEO”) serves as the chief operating decision maker and does not make resource allocation decisions or assess the performance of the business based on these categories, but rather on the entire entity in the aggregate. Accordingly, the measures of profit and loss and total assets are effectively those of the Company as a whole as reflected in these Condensed Consolidated Financial Statements. Based on these facts and circumstances, we have concluded that we operate in one business segment.
Certain reclassifications have been made to prior periods to conform to the current presentation. In our Condensed Consolidated Statements of Operations, (gains) and losses on the sale of assets have been reclassified from selling, general and administrative expenses to a stand-alone caption included within total operating income.
The results of operations for the three and six months ended June 30, 2025 are not necessarily indicative of the results of operations to be expected for the full fiscal year ending December 31, 2025.
Recently Issued Accounting Pronouncements
In November 2024, the Financial Accounting Standards Board issued ASU 2024-03 “Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expense” (“ASU 2024-03”) which expands annual and interim disclosures for certain types of expenses (including purchases of inventory, employee compensation, depreciation, amortization, and depletion) in commonly presented expense captions (such as cost of sales, selling, general & administrative expenses, and research and development). ASU 2024-03 is effective for our annual periods beginning January 1, 2027, and for interim periods beginning January 1, 2028, with early adoption permitted. The adoption of ASU 2024-03 is not expected to have a material impact on our Consolidated Financial Statements or disclosures.
5

3. Trade Accounts Receivable
The following table summarizes our trade accounts receivable from customers as of the dates presented:

| June 30, |  | December 31,
| 2025 |  | 2024
Trade accounts receivable |  |  |
Rentals | $ | 12,525 |  |  | $ | 14,218 |
Sales and aftermarket services | 1,735 |  |  | 2,657 |
| 14,260 |  |  | 16,875 |
Less: Provision for credit losses | (518) |  |  | (1,249) |
Total trade accounts receivable, net | $ | 13,742 |  |  | $ | 15,626 |

Our trade accounts receivable consist of customer obligations due under normal trade terms for (i) operating leases for the use of our compressor equipment, (ii) the sale of compressors and related equipment and (iii) the performance of aftermarket services.
Major Customers and Concentration of Credit Risk
Rental revenue and sales from Occidental Permian, LTD. (“Oxy”) in the six months ended June 30, 2025 and 2024 amounted to 47 percent and 51 percent of revenue, respectively. No other single customer accounted for more than 10 percent of our revenues during these periods. Likewise, Oxy’s accounts receivable balances amounted to 50 percent and 52 percent of our accounts receivable as of June 30, 2025, and December 31, 2024, respectively. No other customers amounted to more than 10 percent of our accounts receivable as of these dates.
Provision for Credit Losses
The following table summarizes the changes in our provision for credit losses for the periods presented:

| Six months ended |  | Year ended
| June 30, |  | December 31,
| 2025 |  | 2024
Beginning balance | $ | 1,249 |  |  | $ | 823 |
Provision for credit losses | 208 |  |  | 433 |
Write-offs | (939) |  |  | (7) |
Ending balance | $ | 518 |  |  | $ | 1,249 |

Management believes that the provision is adequate; however, actual write-offs may exceed the recorded provision. The substantial write-off of the provision for credit losses during the six months ended June 30, 2025 reflects certain aged receivables that are no longer deemed collectible.
4. Inventory
The following table summarizes the components of our inventory, net of allowance for obsolescence, as of the dates presented:

| June 30, |  | December 31,
| 2025 |  | 2024
Raw materials, net of allowance of $1,499 and $4,379, respectively | $ | 17,576 |  |  | $ | 17,706 |
Work-in-process | 758 |  |  | 345 |
Inventory - current | 18,334 |  |  | 18,051 |
Raw materials - long term, net of allowance of $1,020 and $1,488, respectively | — |  |  | — |
Total inventory | $ | 18,334 |  |  | $ | 18,051 |

Our long-term inventory, which is fully reserved for obsolescence, consists of raw materials that remain viable but with limited market opportunities.
6

The following table summarizes the changes in our allowance for obsolescence for the periods presented:

| June 30, |  | December 31,
| 2025 |  | 2024
Beginning balance | $ | 5,867 |  |  | $ | 4,004 |
Allowance for obsolescence | 61 |  |  | 1,863 |
Write-offs | (3,409) |  |  | — |
Ending balance | $ | 2,519 |  |  | $ | 5,867 |

The substantial write-off of the allowance for obsolescence during the six months ended June 30, 2025 reflects the disposal of inventory items, including engines, frames and coolers, among other items that were previously held and reserved at our former Midland, Texas fabrication facility.
5. Assets Held for Sale
During the second quarter of 2025, we completed all activities necessary to terminate operations at our fabrication, repair and overhaul facility in Midland, Texas (the (“Midland Facility”) and prepared the site, which includes an industrial building and land, for sale. Accordingly, depreciation of the facility was suspended and the combined net carrying value of the building and land, or $2.2 million, was reclassified from property and equipment to an asset held for sale included as a component of current assets on our Condensed Consolidated Balance Sheet as of June 30, 2025. We have engaged a broker and are actively marketing the facility. The closure of the Midland Facility was part of our strategy to streamline and outsource our assembly operations and monetize company-owned real estate as disclosed previously. We anticipated that we will complete a sale transaction for the Midland Facility within the next twelve months.
Beginning in the first quarter of 2025, all equipment with continuing productive value was transferred from the Midland Facility to certain of our other regional service centers. By the end of April 2025, the Midland Facility was completely vacant in anticipation of the eventual sale. In addition, we disposed of all inventory items, including engines, frames and coolers, among other items that were fully reserved (see Note 4).
In connection with complete closure of the Midland Facility, we terminated eight employees and incurred $0.1 million of severance and termination benefits all of which were paid and settled during April 2025.
6. Rental Equipment
The following table summarizes our rental equipment and accumulated depreciation as of the dates presented:

| June 30, |  | December 31,
| 2025 |  | 2024
Compressor units | $ | 627,823 |  |  | $ | 579,373 |
Work-in-progress | 41,207 |  |  | 51,662 |
| 669,030 |  |  | 631,035 |
Accumulated depreciation | (222,078) |  |  | (216,014) |
Rental equipment, net of accumulated depreciation | $ | 446,952 |  |  | $ | 415,021 |

We evaluated our rental equipment for potential impairments as of June 30, 2025, and December 31, 2024 and determined that none were present. Depreciation expense for rental equipment was $8.0 million and $6.9 million for the three months ended June 30, 2025, and 2024, respectively and $15.7 million and $13.4 million for the six months ended June 30, 2025, and 2024, respectively. We capitalized interest totaling approximately $0.5 million and $1.3 million for the three months ended June 30, 2025, and 2024, respectively, and $1.1 million a nd $2.4 million, for the six months ended June 30, 2025, and 2024, respe ctively.
7

7. Property and Equipment
The following table summarizes our property and equipment as of the dates presented:

| June 30, |  | December 31,
| 2025 |  | 2024
Land | $ | 1,562 |  |  | $ | 1,680 |
Building | 16,135 |  |  | 19,140 |
Leasehold improvements | 1,022 |  |  | 1,346 |
Office equipment and furniture | 2,057 |  |  | 2,057 |
Software | 589 |  |  | 589 |
Machinery and equipment | 4,929 |  |  | 4,430 |
Vehicles | 12,998 |  |  | 12,739 |
Work-in-progress | 1,932 |  |  | 168 |
| 41,224 |  |  | 42,149 |
Less accumulated depreciation | (18,560) |  |  | (19,160) |
Total | $ | 22,664 |  |  | $ | 22,989 |

Depreciation expense for property and equipment was $0.9 million and $0.8 million for the three months ended June 30, 2025, and 2024, respectively, and $1.9 million and $1.3 million for the six months ended June 30, 2025, and 2024, respectively.
During the quarter ended June 30, 2025, we reclassified certain items of property and equipment attributable to our former Midland Facility with a carrying value of $2.2 million to assets held for sale (see Note 5).
8. Supplemental Balance Sheet Disclosures
The following table summarizes the components of accrued liabilities as of the dates presented:

| June 30, |  | December 31,
| 2025 |  | 2024
Accrued purchases | $ | 3,529 |  |  | $ | 2,085 |
Compensation | 3,395 |  |  | 3,483 |
Right of use obligations | 165 |  |  | 153 |
Interest | 195 |  |  | 269 |
Sales taxes | 261 |  |  | 355 |
Other | 2,752 |  |  | 1,343 |
| $ | 10,297 |  |  | $ | 7,688 |

9. Long-Term Debt
Our outstanding long-term debt consists of the following, as of the dates presented:

| June 30, |  | December 31,
| 2025 |  | 2024
Credit facility | $ | 182,000 |  |  | $ | 170,000 |

We have a senior secured revolving credit agreement, as amended (the “Credit Facility”) with Texas Capital Bank, National Association (the “Lender”) as administrative agent, and TCBI Securities, Inc., Bank of America, N.A., and the Huntington National Bank as joint lead arrangers and joint book runners. On April 18, 2025, we entered into the Fourth Amendment to the Amended and Restated Credit Agreement (the “Fourth Amendment”) with the Lender and certain other 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 beginning on June 30, 2026. In connection with the Fourth Amendment, we incurred fees of $1.2 million.
8

The Credit Facility provides for a total commitment of $400.0 million. We also have a right to request from the Lender 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 June 30, 2025, we had $182.0 million outstanding under our Credit Facility with a weighted average interest rate of 7.23%. As of June 30, 2025 we had approximately $172.3 million available for borrowing under the Credit Facility, subject to a borrowing base determination. As of June 30, 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 Lender 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 Lender 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 Lender in its sole discretion. The Lender may adjust the borrowing base components if material deviations in the collateral are discovered in future audits of the collateral.
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 Lender 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, less than or equal to (a) 3.75 to 1.00 for fiscal quarter ending on June 30, 2025, (b) and 3.50 to 1.00 for each fiscal quarter thereafter 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.
9

10. Income Taxes
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.
During 2020, we received federal income tax refunds corresponding to the 2018 NOL carryback leaving approximately $11.4 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 is required to review the refund claim and provide a report to the Joint Committee on Taxation of the U.S. Congress (“JCT”). Our request for refund was formally submitted to the JCT for their review during the second quarter of 2025 and we are currently awaiting their response. As a result of the submission of the refund claim to the JCT, the IRS has effectively completed their review of the income tax returns for 2015, 2016 and 2017; however, the tax return for 2019 remains technically subject to review until a response is received from the JCT.
11. Commitments and Contingencies
From time to time, we are a party to various claims and legal proceedings arising from our operations in the ordinary course of business. We are not currently a party to any material legal proceedings, and we are not aware of any threatened material litigation. While the outcome of any potential claims and legal proceedings against us cannot be predicted with certainty, we have concluded that it is not considered reasonably possible that a loss resulting from any such claims or proceedings in excess of any amounts accrued has been incurred that is expected to have a material adverse effect on our financial condition, results of operations or cash flows. Furthermore, we believe that we maintain adequate insurance coverage against any potential litigation loss relating to insurable risks.
12. Revenues from Customers
Disaggregation of Revenue
The following table summarizes our revenue disaggregated by product or service type for the periods presented:

| Three months ended June 30, |  | Six months ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Rental | $ | 39,580 |  |  | $ | 34,926 |  |  | $ | 78,490 |  |  | $ | 68,660 |
Sales |  |  |  |  |  |  |
Compressors | 129 |  |  | 58 |  |  | 950 |  |  | 1,341 |
Other (Parts/Rebuilds) | 621 |  |  | 2,212 |  |  | 1,727 |  |  | 3,432 |
| 750 |  |  | 2,270 |  |  | 2,677 |  |  | 4,773 |
Aftermarket services | 1,052 |  |  | 1,295 |  |  | 1,598 |  |  | 1,965 |
Total revenue | $ | 41,382 |  |  | $ | 38,491 |  |  | $ | 82,765 |  |  | $ | 75,398 |

No amounts were recognized in revenue attributable to deferred revenue during the six months ended June 30, 2025. We recognized $0.4 million in revenue for the six months ended June 30, 2024, that was included in accrued liabilities as deferred revenue at the beginning of 2024.
Transaction Price Allocated to the Remaining Performance Obligations
As of June 30, 2025, and December 31, 2024, we had no deferred revenue related to unsatisfied performance obligations.
Contract Costs
We recognize the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets that we otherwise would have recognized is one year or less. These costs are included within Selling, general and administrative expenses in our Condensed Consolidated Statements of Operations.
10

13. Stock-Based and Other Long-Term Incentive Compensation
We maintain two stockholder approved plans for the issuance of stock-based compensation awards to our employees and Board of Director members: (i) the 2019 Equity Incentive Plan, as amended (the “Equity Incentive Plan”), and (ii) the 1998 Stock Option Plan, as amended (the “Stock Option Plan”).
The following table summarizes the total stock-based compensation expense recognized during the periods presented:

| Three months ended June 30, |  | Six months ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Equity-classified | $ | 579 |  |  | $ | 242 |  |  | $ | 938 |  |  | $ | 516 |
Liability-classified (1) | 137 |  |  | 16 |  |  | 137 |  |  | 16 |
| $ | 716 |  |  | $ | 258 |  |  | $ | 1,075 |  |  | $ | 532 |

(1) Represents compensation expense associated with awards that may be settled in cash at the option of the grantee.
1998 Stock Option Plan
The Stock Option Plan provides for the granting of incentive and non-qualified stock options to our employees for up to 1,000,000 shares of common stock. After consideration of the activity described in the table below, a total of 395,669 shares remained available for grant under the Stock Option Plan as of June 30, 2025. The last date that grants can be made under the Stock Option Plan is February 28, 2026. A summary of all option activity during the six months ended June 30, 2025 is presented below:

| Number of Shares Underlying Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (years) |  | Aggregate Intrinsic Value
Outstanding, December 31, 2024 | 113,751 |  |  | $ | 20.44 |  |  | 5.84 |  | $ | 747 |
Granted | 40,250 |  |  | $ | 22.19 |  |  |  |  | $ | — |
Exercised | (5,267) |  |  | $ | 10.58 |  |  |  |  | $ | 76 |
Canceled/Forfeited | (5,333) |  |  | $ | 23.24 |  |  |  |  | $ | 16 |
Expired | (23,167) |  |  | $ | 22.90 |  |  |  |  | $ | — |
Outstanding, June 30, 2025 | 120,234 |  |  | $ | 20.86 |  |  | 7.73 |  | $ | 634 |
Exercisable, June 30, 2025 | 49,819 |  |  | $ | 19.79 |  |  | 5.52 |  | $ | 339 |

The following table summarizes information about our stock options outstanding as of June 30, 2025:

Range of Exercise Prices: | Options Outstanding |  | Options Exercisable
Shares |  | Weighted Average Remaining Contractual Life (years) |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price
$0.01-$18.00 | 24,234 |  |  | 6.79 |  | $ | 10.76 |  |  | 20,067 |  |  | $ | 10.95 |
$18.01-$26.00 | 79,250 |  |  | 9.30 |  | $ | 22.41 |  |  | 13,002 |  |  | $ | 22.66 |
$26.01-$30.00 | 16,750 |  |  | 1.63 |  | $ | 28.15 |  |  | 16,750 |  |  | $ | 28.15 |
| 120,234 |  |  | 7.73 |  | $ | 20.86 |  |  | 49,819 |  |  | $ | 19.79 |

11

The following table summarizes changes in our unvested stock options during the six months ended June 30, 2025:

| Shares |  | Weighted Average Grant Date Fair Value Per Share
Unvested, December 31, 2024 | 48,998 |  |  | $ | 11.35 |
Granted | 40,250 |  |  | $ | 12.06 |
Vested | (14,833) |  |  | $ | 11.33 |
Canceled/Forfeited | (4,000) |  |  | $ | 12.46 |
Unvested, June 30, 2025 | 70,415 |  |  | $ | 11.70 |

As of June 30, 2025, there was a total of approximately $0.6 million of unrecognized compensation cost related to unvested options which is expected to be recognized over the next 2.33 years.
2019 Equity Incentive Plan
On June 5, 2025, our stockholders approved an amendment to the Equity Incentive Plan (the “Amendment”) to increase the number of shares available by 500,000 shares up to a total of 1,650,000 shares of common stock for issuance in the form of awards for: (i) stock options, (ii) stock appreciation rights, (iii) restricted awards in the form of restricted stock and restricted stock units (“RSUs”), (iv) performance share awards, including performance share units (“PSUs”) and (v) other equity-based awards. In addition, the Amendment extended the term of the Equity Incentive Plan by five years to June 20, 2034. After consideration of the activity described in detail below, a total of 643,514 shares remained available for grant under the Equity Incentive Plan as of June 30, 2025.
Time-Vested RSUs
The following table summarizes all restricted stock and RSU activity during the six months ended June 30, 2025 is presented below:

| Number of Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Life (years) |  | Aggregate Intrinsic Value
Outstanding, December 31, 2024 | 131,183 |  |  | $ | 16.39 |  |  | 5.15 |  | $ | 3,516 |
Granted | 69,672 |  |  | $ | 22.67 |  |  |  |  | $ | 1,579 |
Vested | (53,094) |  |  | $ | 15.35 |  |  |  |  | $ | 1,327 |
Canceled/Forfeited | (910) |  |  | $ | 22.19 |  |  |  |  | $ | 17 |
Outstanding, June 30, 2025 | 146,851 |  |  | $ | 19.71 |  |  | 4.27 |  | $ | 3,790 |

As of June 30, 2025, there was a total of approximately $2.1 million of unrecognized compensation cost related to unvested restricted stock and RSUs which is expected to be recognized over the next 2.12 years.
Cash Settled RSUs
The 2025 and 2024 grants of RSUs to the independent Board members that can be settled in cash represent liability-classified awards. Compensation expense associated with these awards is based upon the fair value of NGS common stock at each reporting period relative to that portion of the service period that has passed. Accordingly, the compensation expense is variable in nature.

| Number of Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Life (years) |  | Aggregate Intrinsic Value
Outstanding, December 31, 2024 | 15,069 |  |  | $ | 19.51 |  |  | 0.50 |  | $ | 294 |
Granted | 13,368 |  |  | $ | 24.69 |  |  |  |  | $ | 330 |
Vested | (8,430) |  |  | $ | 19.57 |  |  |  |  | $ | 165 |
Canceled/Forfeited | (2,810) |  |  | $ | 19.57 |  |  |  |  | $ | 55 |
Outstanding, June 30, 2025 | 17,197 |  |  | $ | 23.50 |  |  | 0.78 |  | $ | 445 |

12

Performance Share Units
The potential payout for the PSU awards is based upon performance for a three-year period ending December 31, 2026 for the 2024 grants and December 31, 2027 for the 2025 grants measured against relative total shareholder return (“TSR”) compared to a peer group of companies as established by the Compensation Committee. The PSU award payout ranges from zero (if the Company ranks below the 31.25 percentile) and up to 200% (if the Company ranks first) based upon our relative TSR performance ranking (subject to certain caps based on absolute TSR as defined in the PSU agreements).
With respect to vesting, the PSUs have both a service condition and a market condition. Due to the presence of the TSR measurement for the common equity of the peer companies, including NGS common stock, which is deemed a “market condition,” the grant-date fair values of the PSUs have been determined using a binomial pricing model, or a Monte Carlo simulation model.
The following table summarizes the weighted average grant date fair values of PSUs granted and the assumptions used in the Monte Carlo simulation model for the determination of the grant date fair values of our PSUs granted during the six months ended June 30, 2025:

Weighted-average grant date fair value of PSUs granted | $ | 28.05 |
Risk free rate | 3.93 | %
Expected volatility | 43.9 | %
Expected dividend yield | — | %

The following table summarizes all PSU activity during the six months ended June 30, 2025:

| Number of Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Life (years) |  | Aggregate Intrinsic Value
Outstanding, December 31, 2024 | 56,764 |  |  | $ | 22.47 |  |  | 2.22 |  | $ | — |
Granted | 39,434 |  |  | $ | 28.05 |  |  |  |  | $ | — |
Vested | — |  |  |  |  |  |  | $ | — |
Canceled/Forfeited | — |  |  |  |  |  |  | $ | — |
Outstanding, June 30, 2025 | 96,198 |  |  | $ | 24.76 |  |  | 2.38 |  | $ | — |

As of June 30, 2025, there was a total of approximately $1.8 million of unrecognized compensation cost related to the unvested portion of the PSUs which is expected to be recognized over the next 2.13 years.
14. Earnings per Share
The following table reconciles the numerators and denominators of the basic and diluted earnings per share computation for the periods presented:

| Three months ended June 30, |  | Six months ended June 30, |
| 2025 |  | 2024 |  | 2025 |  | 2024 |  |  |
Numerator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |
Net income | $ | 5,188 |  |  | $ | 4,250 |  |  | $ | 10,042 |  |  | $ | 9,348 |  |  |  |
Denominator for basic earnings per common share: |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding - Basic | 12,483 |  |  | 12,384 |  |  | 12,473 |  |  | 12,392 |  |  |  |
Denominator for diluted earnings per common share: |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding | 12,483 |  |  | 12,384 |  |  | 12,473 |  |  | 12,392 |  |  |  |
Dilutive effect of stock-based compensation awards | 142 |  |  | 99 |  |  | 156 |  |  | 92 |  |  |  |
Weighted average common shares outstanding - Diluted | 12,625 |  |  | 12,483 |  |  | 12,629 |  |  | 12,484 |  |  |  |
Earnings per common share: |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.42 |  |  | $ | 0.34 |  |  | $ | 0.81 |  |  | $ | 0.75 |  |  |  |
Diluted | $ | 0.41 |  |  | $ | 0.34 |  |  | $ | 0.80 |  |  | $ | 0.75 |  |  |  |

13

The following table summarizes the actual number of stock-based compensation awards that were excluded from the determination of diluted earnings per share due to their anti-dilutive effect for the periods presented:

| Three months ended June 30, |  | Six months ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Stock options | 94,000 |  |  | 92,417 |  |  | 94,000 |  |  | 92,417 |
Restricted stock and RSUs | 20,963 |  |  | 5,750 |  |  | 7,595 |  |  | 18,635 |
PSUs | 47,029 |  |  | — |  |  | 47,029 |  |  | — |
| 161,992 |  |  | 98,167 |  |  | 148,624 |  |  | 111,052 |

15. Subsequent Events
On July 30, 2025, our Board of Directors declared a cash dividend of $0.10 per share to stockholders of record as of August 8, 2025 expected to be paid on August 22, 2025.
On August 5, 2025, Brian Tucker, NGS management, and the Board, collectively reached the difficult decision that Mr. Tucker will transition out of his role as President and COO. This was driven solely by an unfortunate and unexpected family loss which changed Mr. Tucker's personal circumstances. His transition will take place over the next several months with a target end date of October 31, 2025. Mr. Tucker remains fully committed to NGS during this time and beyond, if necessary.
On August 8, 2025, our Board of Directors approved a share repurchase program (the “Repurchase Plan”). The Repurchase Plan provides for the repurchase of shares of our common stock from time to time in the open market as conditions, cash reserves, cash flows and the evaluation of uses of cash for operations, growth and share repurchase may allow. The Repurchase Plan is limited to $6 million and expires on August 6, 2027.
We have evaluated all events subsequent to the balance sheet date as of June 30, 2025, and through the date this report was issued and determined that there have been no other events that would require adjustments or additional disclosures to our Condensed Consolidated Financial Statements.
14

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS
This Quarterly Report on Form 10-Q contains certain forward-looking statements, within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and information pertaining to us, our industry and the oil and gas industry that is based on the beliefs of our management, as well as assumptions made by and information currently available to our management. All statements, other than statements of historical facts contained in this Quarterly Report on Form 10-Q, including statements regarding our future financial position, growth strategy, budgets, projected costs, plans and objectives of management for future operations, are forward-looking statements. We use the words “may,” “will,” “expect,” “anticipate,” “estimate,” “believe,” “continue,” “intend,” “plan,” “budget” and other similar words to identify forward-looking statements. You should read statements that contain these words carefully and should not place undue reliance on these statements because they discuss future expectations, contain projections of results of operations or of our financial condition and/or state other “forward-looking” information. We do not undertake any obligation to update or revise publicly any forward-looking statements. Although we believe our expectations reflected in these forward-looking statements are based on reasonable assumptions, no assurance can be given that these expectations or assumptions will prove to have been correct. These risks, contingencies and uncertainties, include , but are not limited to, the following:
•conditions in the oil and gas industry, including the supply and demand for oil and gas and volatility in the prices of oil and gas;
•changes in general economic and financial conditions, inflationary pressures, the potential for economic recession in the U.S., tariffs and trade restrictions, including the imposition of new and higher tariffs on imported goods and retaliatory tariffs implemented by other countries on U.S. goods, and the potential effects on our financial condition, results of operations and cash flows;
•our reliance on major customers;
•failure of projected organic growth due to adverse changes in the oil and gas industry, including depressed oil and gas prices, oppressive environmental regulations and competition;
•our inability to achieve increased utilization of assets, including rental fleet utilization and monetizing other non-cash balance sheet assets;
•failure of our customers to continue to rent equipment after expiration of the primary rental term;
•our ability to economically develop and deploy new technologies and services, including technology to comply with health and environmental laws and regulations;
•failure to achieve accretive financial results in connection with any acquisitions we may make;
•fluctuations in interest rates;
•changes in regulation or prohibition of new or current well completion techniques;
•competition among the various providers of compression services and products;
•changes in safety, health and environmental regulations;
•changes in economic or political conditions in the markets in which we operate;
•the inherent risks associated with our operations, such as equipment defects, malfunctions, natural disasters and adverse changes in customer, employee and supplier relationships;
•our inability to comply with covenants in our debt agreements and the decreased financial flexibility associated with our debt;
•inability to finance our future capital requirements and availability of financing;
•capacity availability, costs and performance of our outsourced compressor fabrication providers and overall inflationary pressures;
•impacts of world events, such as acts of terrorism and significant economic disruptions and adverse consequences resulting from possible long-term effects of potential pandemics and other public health crises; and
•general economic conditions.
We believe that it is important to communicate our expectations of future performance to our investors. However, events may occur in the future that we are unable to accurately predict or that we are unable to control. When considering our forward-looking statements, you should keep in mind the risk factors and other cautionary statements including Item 1A, Risk Factors, in our 2024 Annual Report, as it contains important factors that could cause actual results to differ materially from the expectations reflected in the forward-looking statements.
15

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations
The discussion and analysis of the financial condition and results of operations of Natural Gas Services Group, Inc. (the “Company”, “NGS”, “Natural Gas Services Group”, “we,” “us” or “our”) for the periods ended June 30, 2025, and 2024 are based on, and should be read in conjunction with, our Condensed Consolidated Financial Statements and the related notes included elsewhere in this report and in our Annual Report on Form 10-K for the year ended December 31, 2024. The following discussion contains forward-looking statements that include risks and uncertainties. For a description of limitations inherent in forward-looking statements, see “Special Note Regarding Forward-Looking Statements” above.
All dollar amounts presented in the tables that follow are in thousands unless otherwise indicated. References to “quarters” represent the three months ended June 30, 2025, or 2024, as applicable. Certain variances that represent results that are not meaningful are indicated as “NM.”
Overview
We rent, design, sell, install, service and maintain natural gas and electric compressors and related equipment for oil and gas production and processing facilities, generally using equipment from third-party fabricators and OEM suppliers along with limited in-house assembly. Substantially all of our compressor assembly is done by third-party contractors while a limited level of assembly work remains in-house at our Tulsa, Oklahoma facility. We also provide an exchange and rebuild program for compressors and maintain an inventory of new and used compressors to facilitate this business. Our primary focus is on the rental of natural gas and electric compressors. Our rental contracts generally provide for initial terms of 12 to 60 months, with our larger horsepower units having longer initial terms than our small and medium horsepower units. After the initial term of our rental contracts, most of our customers have continued to rent our compressors on a month-to-month basis. Rental amounts are billed monthly in advance and include maintenance of the rented compressor units.
We conduct our operations in several oil and gas producing basins throughout the United States including the Permian, Barnett Shale, Anadarko, San Juan, Utica/Marcellus Shale, Eagle Ford Shale and Antrim Shale. We have operating facilities in five states including Texas, Oklahoma, New Mexico, Michigan and Ohio. A total of 77 percent of our rental revenue is generated from the Permian Basin and approximately 75 percent of our rental revenue supports oil production primarily in the form of gas lift operations. We operate in one reporting segment.
Operating Highlights
The following table summarizes our key operating statistics as of the dates or for the periods presented, as applicable:

| Three months ended June 30, |  | Six months ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Rented horsepower (at period end) | 498,651 |  |  | 454,568 |  |  | 498,651 |  |  | 454,568 |
Average rented horsepower | 495,665 |  |  | 449,394 |  |  | 494,362 |  |  | 439,740 |
Fleet horsepower available (at period end): | 596,322 |  |  | 552,599 |  |  | 596,322 |  |  | 552,599 |
Fleet horsepower available - average | 599,857 |  |  | 547,428 |  |  | 599,518 |  |  | 538,407 |
Horsepower utilization (at period end) | 83.6 | % |  | 82.3 | % |  | 83.6 | % |  | 82.3 | %
Average horsepower utilization | 82.6 | % |  | 82.1 | % |  | 82.5 | % |  | 81.7 | %
Units utilized (at period end) | 1,198 |  |  | 1,242 |  |  | 1,198 |  |  | 1,242 |
Fleet units (at period end): | 1,833 |  |  | 1,899 |  |  | 1,833 |  |  | 1,899 |
Unit utilization (at period end) | 65.4 | % |  | 65.4 | % |  | 65.4 | % |  | 65.4 | %
Rental revenues | $ | 39,580 |  |  | $ | 34,926 |  |  | $ | 78,490 |  |  | $ | 68,660 |
Total revenues | $ | 41,382 |  |  | $ | 38,491 |  |  | $ | 82,765 |  |  | $ | 75,398 |
Rental revenues as a percent of total revenues | 95.6 | % |  | 90.7 | % |  | 94.8 | % |  | 91.1 | %

Of the total horsepower utilized as of June 30, 2025, 391,785 of horsepower was being rented under contracts expiring between 2025 and 2030 and 106,866 of horsepower was being rented on a month-to-month basis.
16

Our Performance Trends and Outlook
The oil and gas industry has historically been cyclical and production levels of oil and gas are dependent upon numerous factors. The market for compression equipment and services is highly dependent on the production levels of exploration and production companies and pricing of oil and gas.
Crude Oil. The level of production for crude oil activity and capital expenditures has generally been dependent upon the prevailing view of future crude oil prices, which is influenced by numerous supply and demand factors, including availability and cost of capital, well productivity and development costs, global and domestic economic conditions, environmental regulations, policies of OPEC and Russia, and other factors. While crude oil prices have historically been volatile, we expect demand for our existing compressor fleet to remain positive assuming crude oil prices remain within reasonable bands with respect to current pricing levels.
Natural Gas. We believe the market outlook for natural gas production in the U.S. remains steady while short term price volatility remains a factor due to weather, geopolitical influences and shifts in LNG exports. We believe opportunities for increased utilization of our small and medium horsepower units are supported by continued investment in shale gas development, particularly in the Permian basin and Marcellus Shale.
Non-GAAP Financial Measures
We utilize certain financial and operating metrics to analyze our performance and assess our operating results and overall profitably and liquidity. The most significant of these measures are “Adjusted Gross Margin” and “Adjusted EBITDA” both of which are measurements that are not explicitly defined in accordance with generally accepted accounting principles in the United States of America (“GAAP”), or non-GAAP financial measures, and may vary among different industries and the participants therein.
Adjusted Gross Margin
We define “Adjusted Gross Margin” as total revenue less costs of revenues (excluding depreciation and amortization expense). Adjusted gross margin is included as a supplemental disclosure because it is a primary measure used by our management as it represents the results of revenue and costs (excluding depreciation and amortization expense), which are key components of our operations. Adjusted Gross Margin differs from gross margin, in that gross margin includes depreciation and amortization expense. We believe Adjusted Gross Margin is important because it focuses on the current operating performance of our operations and excludes the impact of the prior historical costs of the assets acquired or constructed that are utilized in those operations. Depreciation and amortization expense does not accurately reflect the costs required to maintain and replenish the operational usage of our assets and therefore may not portray the costs from current operating activity. Rather, depreciation and amortization expense reflects the systematic allocation of historical property and equipment costs over their estimated useful lives.
Adjusted Gross Margin has certain material limitations associated with its use as compared to gross margin. These limitations are primarily due to the exclusion of depreciation and amortization expense, which is material to our results of operations. Because we use capital assets, depreciation and amortization expense is a necessary element of our costs and our ability to generate revenue. In order to compensate for these limitations, management uses this non-GAAP measure as a supplemental measure to other GAAP results to provide a more complete understanding of our performance.
As an indicator of our operating performance, Adjusted Gross Margin should not be considered an alternative to, or more meaningful than, gross margin as determined in accordance with GAAP. Our Adjusted Gross Margin may not be comparable to a similarly titled measure of another company because other entities may not calculate Adjusted Gross Margin in the same manner.
17

The following table calculates our gross margin, the most directly comparable GAAP financial measure, and reconciles it to Adjusted Gross Margin with further detail by revenue classification for the periods presented:

| Three months ended June 30, |  | Six months ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Total revenue | $ | 41,382 |  |  | $ | 38,491 |  |  | $ | 82,765 |  |  | $ | 75,398 |
Cost of revenue, exclusive of depreciation and amortization | (17,159) |  |  | (17,489) |  |  | (34,286) |  |  | (33,283) |
Depreciation allocable to cost of revenues | (8,873) |  |  | (7,572) |  |  | (17,412) |  |  | (14,508) |
Gross margin | 15,350 |  |  | 13,430 |  |  | 31,067 |  |  | 27,607 |
Depreciation allocable to cost of revenues | 8,873 |  |  | 7,572 |  |  | 17,412 |  |  | 14,508 |
Adjusted gross margin | $ | 24,223 |  |  | $ | 21,002 |  |  | $ | 48,479 |  |  | $ | 42,115 |
Adjusted gross margin by revenue classification: |  |  |  |  |  |  |
Rental | $ | 24,052 |  |  | $ | 20,698 |  |  | $ | 48,122 |  |  | $ | 41,318 |
Sales | (161) |  |  | 21 |  |  | (250) |  |  | 344 |
Aftermarket services | 332 |  |  | 283 |  |  | 607 |  |  | 453 |
Total adjusted gross margin | $ | 24,223 |  |  | $ | 21,002 |  |  | $ | 48,479 |  |  | $ | 42,115 |

Adjusted EBITDA
“Adjusted EBITDA” is a non-GAAP financial measure that we define as net income (loss) before interest, taxes, depreciation and amortization, as well as an increase in inventory allowance, impairments, retirement of rental equipment, non-recurring restructuring charges including severance and non-cash equity-classified stock-based compensation expenses. This term, as used and defined by us, may not be comparable to similarly titled measures employed by other companies and is not a measure of performance calculated in accordance with GAAP. Adjusted EBITDA should not be considered in isolation or as a substitute for operating income, net income or loss, cash flows provided by operating, investing and financing activities, or other income or cash flow statement data prepared in accordance with GAAP. However, management believes Adjusted EBITDA is useful to an investor in evaluating our operating performance because:
•it is widely used by investors in the energy industry to measure a company’s operating performance without regard to items excluded from the calculation of Adjusted EBITDA, which can vary substantially from company to company depending upon accounting methods and book value of assets, capital structure and the method by which assets were acquired, among other factors;
•it helps investors to more meaningfully evaluate and compare the results of our operations from period to period by removing the impact of our capital structure and asset base from our operating structure; and
•it is used by our management for various purposes, including as a measure of operating performance, in presentations to our Board of Directors, and as a basis for strategic planning and forecasting.
Adjusted EBITDA has limitations as an analytical tool, and you should not consider it in isolation, or as a substitute for analysis of our results as reported under GAAP. Some of these limitations are as follows:
•Adjusted EBITDA does not reflect all our cash expenditures, future requirements for capital expenditures, or contractual commitments;
•Adjusted EBITDA does not reflect changes in, or cash requirements for, our working capital needs;
•Adjusted EBITDA does not reflect the cash requirements necessary to service interest or principal payments on our debt and finance leases; and
•although depreciation and amortization are non-cash charges, the assets being depreciated and amortized will often have to be replaced in the future, and Adjusted EBITDA does not reflect any capital expenditures for such replacements.
18

There are other material limitations to using Adjusted EBITDA as a measure of performance, including the inability to analyze the impact of certain recurring items that materially affect our net income or loss, and the lack of comparability of results of operations of different companies.
The following table reconciles our net income, the most directly comparable GAAP financial measure, to Adjusted EBITDA for the periods presented:

| Three months ended June 30, | Six months ended June 30,
| 2025 |  | 2024 | 2025 |  | 2024
Net income | $ | 5,188 |  |  | $ | 4,250 |  | $ | 10,042 |  |  | $ | 9,348 |
Interest expense | 3,243 |  |  | 2,932 |  | 6,413 |  |  | 5,867 |
Income tax expense | 1,597 |  |  | 1,294 |  | 3,079 |  |  | 2,773 |
Depreciation and amortization | 8,969 |  |  | 7,705 |  | 17,605 |  |  | 14,792 |
Inventory allowance | — |  |  | — |  | 61 |  |  | — |
Retirement of rental equipment | — |  |  | — |  | 728 |  |  | 5 |
Severance and restructuring charges | 89 |  |  | 33 |  | 89 |  |  | 33 |
Stock-based compensation | 579 |  |  | 242 |  | 938 |  |  | 516 |
Adjusted EBITDA | $ | 19,665 |  |  | $ | 16,456 |  | $ | 38,955 |  |  | $ | 33,334 |

19

Results of Operations
Three and six months ended June 30, 2025, compared to the three and six months ended June 30, 2024.
Rentals
We generate revenue primarily from renting, maintaining and servicing compressors to our customers under contractual arrangements. These contracts, which all qualify as operating leases under GAAP, generally include a fee for servicing the compressor unit during the rental term. Our rental contract terms typically range from 12 to 60 months. Our revenue is recognized over time, with monthly payments over the term of the contract. After the terms of the contract have expired, a customer may renew its contract or continue renting on a monthly basis thereafter. The primary costs associated with providing our compressor fleet to our customers includes routine maintenance and repairs, fluids, primarily motor oils, and labor and related support costs for our field service facilities and service employees that are geographically dispersed throughout our operating regions.
The following table summarizes the revenues, costs, adjusted gross margin and related operating statistics with respect to our rentals of compressors for the periods presented:

| Three months ended June 30, |  |  |  |  |  | Six months ended June 30, |  |  |  |
| 2025 |  | 2024 |  | Change |  | % |  | 2025 |  | 2024 |  | Change |  | %
Rental revenue | $ | 39,580 |  |  | $ | 34,926 |  |  | $ | 4,654 |  |  | 13.3 | % |  | $ | 78,490 |  |  | $ | 68,660 |  |  | $ | 9,830 |  |  | 14.3 | %
Cost of rentals (excluding depreciation and amortization) | 15,528 |  |  | 14,228 |  |  | 1,300 |  |  | 9.1 | % |  | 30,368 |  |  | 27,342 |  |  | 3,026 |  |  | 11.1 | %
Rental adjusted gross margin | $ | 24,052 |  |  | $ | 20,698 |  |  | $ | 3,354 |  |  | 16.2 | % |  | $ | 48,122 |  |  | $ | 41,318 |  |  | $ | 6,804 |  |  | 16.5 | %
Rental adjusted gross margin percentage | 60.8 | % |  | 59.3 | % |  | 1.5 | % |  |  |  | 61.3 | % |  | 60.2 | % |  | 1.1 | % |  |
Percent of total company revenues | 95.6 | % |  | 90.7 | % |  | 4.9 | % |  |  |  | 94.8 | % |  | 91.1 | % |  | 3.7 | % |  |
Rented horsepower | 498,651 |  |  | 454,568 |  |  | 44,083 |  |  | 9.7 | % |  | 498,651 |  |  | 454,568 |  |  | 44,083 |  |  | 9.7 | %
Horsepower utilization | 83.6 | % |  | 82.3 | % |  | 1.3 | % |  |  |  | 83.6 | % |  | 82.3 | % |  | 1.3 | % |  |
Units utilized | 1,198 |  |  | 1,242 |  |  | (44) |  |  | (3.5) | % |  | 1,198 |  |  | 1,242 |  |  | (44) |  |  | (3.5) | %
Units utilization | 65.4 | % |  | 65.4 | % |  | — | % |  |  |  | 65.4 | % |  | 65.4 | % |  | — | % |  |
Customers under contract | 63 |  |  | 73 |  |  | (10) |  |  | (13.7) | % |  | 63 |  |  | 73 |  |  | (10) |  |  | (13.7) | %

Rental revenue increased for the three and six months ended June 30, 2025, as compared to the corresponding periods in 2024 due primarily to an increase in rented horsepower despite a decrease in the number of units rented and a decrease in total customers. The increase in revenue reflects a continuing trend of growing demand for our higher horsepower units (400 horsepower and greater) which provide for higher rental rates and realized adjusted gross margins. Our utilized horsepower increased marginally during the second quarter of 2025 as compared to the prior year period which reflects the continued addition of high horsepower compressor units to our fleet consistent with our emphasis on larger units over the past few years, as well as the retirement of certain older medium and small horsepower units from the fleet partially offset by the return of lower horsepower units to the fleet by certain customers at the end of their lease terms. Through June 30, 2025, we placed into service a total 181 newly set units, including 166 from our existing fleet and 15 new units. Of those sets, a total of 48 were high horsepower units and 15 of those were new units to the fleet. The decline in customers is primarily attributable to E&P industry consolidation as well as the acquisition of existing producing oil and gas properties among E&P companies; however, it has not resulted in any meaningful decrease in our level of business activity.
The cost of rentals increased on an absolute basis due to the effects of supporting a larger quantity of utilized horsepower and inflationary pressures primarily in labor and parts costs. An expanding portion of our rented compressor units utilize our proprietary System Management and Recovery Technology (“SMART”) and telemetry software which reduces unplanned shutdowns and increases productivity. Despite inflationary pressure associated with our primary cost components, the SMART and telemetry technology allows us to streamline and manage our maintenance activities more efficiently and thereby mitigating the costs to a manageable extent. As a result of these factors, our adjusted gross margin increased on both an absolute basis as well as a percentage of revenues for the three and six months ended June 30, 2025, compared to the comparable periods in 2024.
20

Sales
We generate revenue from the sale of assembled compressors and parts, as well as exchange/rebuilding customer owned compressors and the sale of used rental equipment. Costs of sales include purchases of engines, compressors, coolers and other component materials as well as direct and indirect labor attributable to the assembly of equipment to meet the unique specifications of our customers. In addition, our costs of sales include overhead and related support costs attributable to our storage, assembly, repair and overhaul facilities in Tulsa, Oklahoma as well as Midland, Texas through its closure at the end of March 2025.
The following table summarizes the revenues, costs and adjusted gross margin with respect to our sales of compressors, parts and equipment and repair/overhaul services for the periods presented:

| Three months ended June 30, |  |  |  |  |  | Six months ended June 30, |  |  |  |
| 2025 |  | 2024 |  | Change |  | % |  | 2025 |  | 2024 |  | Change |  | %
Sales revenue | $ | 750 |  |  | $ | 2,270 |  |  | $ | (1,520) |  |  | (67.0) | % |  | $ | 2,677 |  |  | $ | 4,773 |  |  | $ | (2,096) |  |  | (43.9) | %
Cost of sales (excluding depreciation and amortization) | 911 |  |  | 2,249 |  |  | (1,338) |  |  | (59.5) | % |  | 2,927 |  |  | 4,429 |  |  | (1,502) |  |  | (33.9) | %
Sales adjusted gross margin | $ | (161) |  |  | $ | 21 |  |  | $ | (182) |  |  | NM |  | $ | (250) |  |  | $ | 344 |  |  | $ | (594) |  |  | NM
Sales adjusted gross margin percentage | (21.5) | % |  | 0.9 | % |  | (22.4) | % |  |  |  | (9.3) | % |  | 7.2 | % |  | (16.5) | % |  |
Percent of total company revenues | 1.8 | % |  | 5.9 | % |  | (4.1) | % |  |  |  | 3.2 | % |  | 6.3 | % |  | (3.1) | % |  |

Sales revenue declined for the three and six months ended June 30, 2025, compared to the corresponding periods in 2024. Sales are subject to fluctuations in the timing of industry activity related to our customers’ capital projects and, as such, can vary substantially between periods. Due to these circumstances as well as the costs of maintaining support facilities relative to revenues, we continue to shift our business away from sales of new compressor packages to renting our owned units to our customers. While the costs to support our sales revenues declined on an absolute basis, primarily reflecting a lower volume of business, the gross margins declined to negative values due primarily to indirect labor and fixed overhead costs that are not otherwise subject to capitalization at our assembly, repair and overhaul facilities, as well as severance and other continuing costs primarily at the location in Midland, Texas which we closed at the end of March 2025. Sales represented an insignificant portion of our gross margin in the three and six months ended June 30, 2025, and 2024, respectively.
Aftermarket Service
We provide routine or call-out services on customer-owned equipment as well as commissioning of new units for customers. Revenue is recognized after services in the contract are rendered. The primary costs associated with our aftermarket services are labor, support costs, materials and supplies.
The following table summarizes the revenues, costs and adjusted gross margin with respect to our aftermarket services for the periods presented:

| Three months ended June 30, |  |  |  |  |  | Six months ended June 30, |  |  |  |
| 2025 |  | 2024 |  | Change |  | % |  | 2025 |  | 2024 |  | Change |  | %
Aftermarket services revenue | $ | 1,052 |  |  | $ | 1,295 |  |  | $ | (243) |  |  | (18.8) | % |  | $ | 1,598 |  |  | $ | 1,965 |  |  | $ | (367) |  |  | (18.7) | %
Cost of aftermarket services (excluding depreciation and amortization) | 720 |  |  | 1,012 |  |  | (292) |  |  | (28.9) | % |  | 991 |  |  | 1,512 |  |  | (521) |  |  | (34.5) | %
Aftermarket services adjusted gross margin | $ | 332 |  |  | $ | 283 |  |  | $ | 49 |  |  | 17.3 | % |  | $ | 607 |  |  | $ | 453 |  |  | $ | 154 |  |  | 34.0 | %
Aftermarket services adjusted gross margin percentage | 31.6 | % |  | 21.9 | % |  | 9.7 | % |  |  |  | 38.0 | % |  | 23.1 | % |  | 14.9 | % |  |
Percent of total company revenues | 2.5 | % |  | 3.4 | % |  | (0.9) | % |  |  |  | 1.9 | % |  | 2.6 | % |  | (0.7) | % |  |

Third party aftermarket services revenues and costs declined for the three months ended June 30, 2025, compared to the corresponding periods during 2024; however, the absolute gross margins and percentages both improved over the prior periods in 2024. The decline in revenue and costs is primarily attributable to a marginally lower volume of unit commissioning work performed during the 2025 periods compared to 2024 as well as the effect of lower freight costs. Aftermarket services represented an insignificant portion of our gross margin in the three and six months ended June 30, 2025, and 2024, respectively.
21

Selling, General and Administrative Expenses
Our selling, general and administrative (“SG&A”) expenses include compensation and benefits, including stock-based compensation, commissions and other support costs of departments serving administrative and corporate governance functions, such as executive management, finance and accounting, sales and marketing, human resources, information technology, health, safety and environmental and investor relations. In addition, SG&A includes non-personnel costs, such as occupancy costs, IT support costs, professional fees and other supporting corporate expenses including public company compliance costs.

| Three months ended June 30, |  |  |  |  |  | Six months ended June 30, |  |  |  |
| 2025 |  | 2024 |  | Change |  | % |  | 2025 |  | 2024 |  | Change |  | %
Primary selling, general and administrative expenses | $ | 4,875 |  |  | $ | 4,778 |  |  | $ | 97 |  |  | 2.0 | % |  | $ | 9,894 |  |  | $ | 9,206 |  |  | $ | 688 |  |  | 7.5 | %
Stock-based compensation - equity classified | 579 |  |  | 242 |  |  | 337 |  |  | 139.3 | % |  | 938 |  |  | 516 |  |  | 422 |  |  | 81.8 | %
Total | $ | 5,454 |  |  | $ | 5,020 |  |  | $ | 434 |  |  | 8.6 | % |  | $ | 10,832 |  |  | $ | 9,722 |  |  | $ | 1,110 |  |  | 11.4 | %
SG&A expenses as a percent of total revenues | 13.2 | % |  | 13.0 | % |  | 0.2 | % |  |  |  | 13.1 | % |  | 12.9 | % |  | 0.2 | % |  |

SG&A expenses increased during the three and six months ended June 30, 2025, as compared to the corresponding periods in 2024. In general, the increase in our total SG&A expenses reflects a higher level of cost to appropriately scale our administrative function. The marginal increase in primary SG&A expenses during the three months ended June 30, 2025 as compared to 2024 reflects (i) higher information technology support costs of $0.2 million, (ii) higher public company costs of $0.1 million and (iii) higher occupancy and office costs of $0.1 million which were substantially offset by (i) lower credit loss expenses of $0.1 million, (ii) lower compensation costs of $0.1 million and (iii) lower professional fees of $0.1 million. The increase in primary SG&A expenses during the six months ended June 30, 2025 compared to 2024 was impacted by (i) higher information technology support costs of $0.4 million in support of our growth initiatives, (ii) higher salaries and benefits of $0.2 million reflecting support staff growth (iii) higher public company costs of $0.1 million and (iv) marginally higher occupancy and office costs of $0.1 million. These increases were partially offset by $0.1 million of lower professional fees and credit loss expense on a combined basis. Our equity classified stock-based compensation increased during both periods in 2025 over 2024 due primarily to a higher mix of performance-based share unit awards, or PSUs, for our executive officers in the 2025 period. PSUs generally have a higher grant-date fair value than traditional restricted stock and restricted stock units.
Depreciation and Amortization
Depreciation and amortization expenses reflect the depreciation of our rental compressor fleet as well as the depreciation and amortization of our operating and corporate facilities, vehicles and other equipment, and the amortization of finance leases and intangible assets.
The following table summarizes the components of our depreciation and amortization expenses for the periods presented:

| Three months ended June 30, |  |  |  |  |  | Six months ended June 30, |  |  |  |
| 2025 |  | 2024 |  | Change |  | % |  | 2025 |  | 2024 |  | Change |  | %
Depreciation and amortization allocable to cost of revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental | $ | 8,758 |  |  | $ | 7,488 |  |  | $ | 1,270 |  |  | 17.0 | % |  | $ | 17,194 |  |  | $ | 14,347 |  |  | $ | 2,847 |  |  | 19.8 | %
Sales | 93 |  |  | 70 |  |  | 23 |  |  | 32.9 | % |  | 185 |  |  | 140 |  |  | 45 |  |  | 32.1 | %
Aftermarket services | 22 |  |  | 14 |  |  | 8 |  |  | 57.1 | % |  | 33 |  |  | 21 |  |  | 12 |  |  | 57.1 | %
| 8,873 |  |  | 7,572 |  |  | 1,301 |  |  | 17.2 | % |  | 17,412 |  |  | 14,508 |  |  | 2,904 |  |  | 20.0 | %
Corporate depreciation | 96 |  |  | 98 |  |  | (2) |  |  | (2.0) | % |  | 193 |  |  | 218 |  |  | (25) |  |  | (11.5) | %
Intangible asset amortization | — |  |  | 35 |  |  | (35) |  |  | NM |  | — |  |  | 66 |  |  | (66) |  |  | NM
Total | $ | 8,969 |  |  | $ | 7,705 |  |  | $ | 1,264 |  |  | 16.4 | % |  | $ | 17,605 |  |  | $ | 14,792 |  |  | $ | 2,813 |  |  | 19.0 | %
Depreciation and amortization as a percent of total revenues | 21.7 | % |  | 20.0 | % |  | 1.7 | % |  |  |  | 21.3 | % |  | 19.6 | % |  | 1.7 | % |  |

Depreciation and amortization expense increased for the three and six months ended June 30, 2025, as compared to the corresponding periods in 2024, due primarily to depreciation expense associated with the high horsepower units placed in service during the second half of 2024 continuing through June 30, 2025. These higher horsepower unit additions, which began in earnest during 2023, are reflective of our strategic plans to concentrate our business development on these higher margin applications.
22

Inventory Allowance
We routinely review our stock of inventory for obsolescence and realizability. When the carrying value exceeds the net realizable value, a charge is recorded to operating income.
The following table indicates the charges incurred for inventory allowance for the periods presented:

| Three months ended June 30, |  |  |  |  |  | Six months ended June 30, |  |  |  |
| 2025 |  | 2024 |  | Change |  | % |  | 2025 |  | 2024 |  | Change |  | %
Inventory allowance | $ | — |  |  | $ | — |  |  | $ | — |  |  | NM |  | $ | 61 |  |  | $ | — |  |  | $ | 61 |  |  | NM

During three months ended March 31, 2025, we recorded a nominal increase to the allowance for obsolescence primarily attributable to the transfer of inventory that remains useful from our former Midland, Texas facility, in connection with its closing in March 2025, to our other operating facilities. All of remaining inventory from the Midland, Texas facility that was subject to the allowance for obsolescence was written off during the three months ended March 31, 2025. As of June 30, 2025, we had an inventory obsolescence balance of $2.5 million as compared to $5.9 million as of December 31, 2024. Please see Note 4 (“Inventory”) to our Condensed Consolidated Financial Statements for additional information regarding the inventory allowance.
Retirement of Rental Equipment
We routinely review the rental fleet to determine which units are no longer of the type, configuration, make or model that our customers are demanding or that are not cost efficient to refurbish, maintain and/or operate. When appropriate, we retire such units from the fleet and write-off any remaining carrying value.
The following table indicates the charges incurred for the retirement of rental equipment for the periods presented:

| Three months ended June 30, |  |  |  |  |  | Six months ended June 30, |  |  |  |
| 2025 |  | 2024 |  | Change |  | % |  | 2025 |  | 2024 |  | Change |  | %
Retirement of rental equipment | $ | — |  |  | $ | — |  |  | $ | — |  |  | NM |  | $ | 728 |  |  | $ | 5 |  |  | $ | 723 |  |  | NM

We retired certain small and medium horsepower compressor units during the six months ended June 30, 2025 with only those units retired during the three months ended March 31, 2025 and 2024 having any remaining carrying value. Such retirements were minimal during the comparable periods during 2024.
Gain on the Sale of Assets
As circumstances warrant, we will market certain property and equipment, primarily trucks, and other assets when we have determined that there is no longer a productive use for such assets or favorable opportunities arise to monetize otherwise idle assets. Gains and losses are recognized accordingly upon the completion of such transactions.
The following table presents the gains recognized upon the sale of assets for the periods presented:

| Three months ended June 30, |  |  |  |  |  | Six months ended June 30, |  |  |  |
| 2025 |  | 2024 |  | Change |  | % |  | 2025 |  | 2024 |  | Change |  | %
Gain on the disposition of assets, net | $ | 124 |  |  | $ | 229 |  |  | $ | (105) |  |  | NM |  | $ | 178 |  |  | $ | 229 |  |  | $ | (51) |  |  | NM

Gains recognized during the three and six months ended June 30, 2025 are primarily attributable to the sales of trucks after the completion of their useful lives.
Interest Expense
Interest expense primarily reflects the costs of borrowing, including commitment fees and the amortization of debt issue costs, under our senior secured revolving credit agreement, as amended (the “Credit Facility”), net of amounts capitalized attributable to certain capital projects. Also included is interest expense on our financing leases during the 2024 periods as all were settled before 2025.
23

The following table presents the components of our interest expense for the periods presented:

| Three months ended June 30, |  |  |  |  |  | Six months ended June 30, |  |  |  |
| 2025 |  | 2024 |  | Change |  | % |  | 2025 |  | 2024 |  | Change |  | %
Interest on borrowings, finance leases and related fees | $ | 3,464 |  |  | $ | 4,037 |  |  | $ | (573) |  |  | (14.2) | % |  | $ | 6,996 |  |  | $ | 7,980 |  |  | $ | (984) |  |  | (12.3) | %
Amortization of debt issue costs | 294 |  |  | 165 |  |  | 129 |  |  | 78.2 | % |  | 506 |  |  | 315 |  |  | 191 |  |  | 60.6 | %
Capitalized interest | (515) |  |  | (1,270) |  |  | 755 |  |  | (59.4) | % |  | (1,089) |  |  | (2,428) |  |  | 1,339 |  |  | (55.1) | %
Total | $ | 3,243 |  |  | $ | 2,932 |  |  | $ | 311 |  |  | 10.6 | % |  | $ | 6,413 |  |  | $ | 5,867 |  |  | $ | 546 |  |  | 9.3 | %
Weighted-average interest rates on borrowings | 7.46 | % |  | 8.92 | % |  | (1.46) | % |  |  |  | 7.68 | % |  | 9.00 | % |  | (1.32) | % |  |
Weighted-average outstanding borrowings | $ | 175,427 |  |  | $ | 169,839 |  |  | $ | 5,588 |  |  |  |  | $ | 172,867 |  |  | $ | 168,790 |  |  | $ | 4,077 |  |  |

Interest expense increased for the three and six months ended June 30, 2025, as compared to the corresponding periods in 2024, due primarily to the effect of $0.8 million and $1.3 million lower capitalized interest, respectively, due primarily to the volume and timing of the completion of certain compressor assembly projects in the 2025 periods. In addition, amortization of debt issue costs increased during the three and six months ended June 30, 2025, as compared to the comparable periods in 2024 due primarily to the amortization of costs associated with certain amendments to the Credit Facility that took place in June of 2024 as well as the the Fourth Amendment to the Amended and Restated Credit Agreement (the “Fourth Amendment”) that was completed in April 2025. While the average borrowings outstanding under our Credit Facility have increased during the three and six months ended June 30, 2025, as compared to the comparable periods in 2024, we experienced lower average interest rates consistent with the Federal Reserve interest rate reductions implemented in the second half of 2024 as well as the lower interest rates attributable to the Fourth Amendment.
Other Income (Expense), net
This caption primarily reflects non-operating items of income and loss including non-cash gains and losses attributable to our corporate-owned life insurance (“COLI”) policies related to our deferred compensation plan.
The following table indicates our other income (expense) for the periods presented:

| Three months ended June 30, |  |  |  |  |  | Six months ended June 30, |  |  |  |
| 2025 |  | 2024 |  | Change |  | % |  | 2025 |  | 2024 |  | Change |  | %
Other income (expense), net | $ | 104 |  |  | $ | (30) |  |  | $ | 134 |  |  | NM |  | $ | 103 |  |  | $ | 163 |  |  | $ | (60) |  |  | NM

Other income (expense), net improved for the three months ended June 30, 2025 as compared to the corresponding period in 2024 due primarily to certain non-operating credits and unrealized gains attributable to our COLI policies associated with our deferred compensation plan while the six months ended June 30, 2025 declined as compared to the comparable period in 2024, due primarily to higher unrealized gains attributable to our COLI policies in the 2024 period.
Provision for Income Taxes
Provision for income taxes represents our income taxes as determined in accordance with GAAP. It considers taxes attributable to our obligations for federal taxes under the Internal Revenue Code as well as to various states in which we operate, primarily Texas. Please see Note 10 (“Income Taxes”) to our Condensed Consolidated Financial Statements for additional information.
The following table summarizes our income tax provision for the periods presented:

| Three months ended June 30, |  |  |  |  |  | Six months ended June 30, |  |  |  |
| 2025 |  | 2024 |  | Change |  | % |  | 2025 |  | 2024 |  | Change |  | %
Income tax expense | $ | 1,597 |  |  | $ | 1,294 |  |  | $ | 303 |  |  | 23 | % |  | $ | 3,079 |  |  | $ | 2,773 |  |  | $ | 306 |  |  | 11 | %
Effective income tax rate | 23.5 | % |  | 23.3 | % |  | 0.2 | % |  |  |  | 23.5 | % |  | 22.9 | % |  | 0.6 | % |  |

For interim periods, our income tax expense is computed based upon our estimated annual effective tax rate and any discrete items that impact the interim periods. Our estimated annual effective tax rate differs from the U.S. federal statutory rate of 21% primarily as a result of certain expenses not being deductible for income tax purposes.
24

Financial Condition
Liquidity and Capital Resources
Our primary sources of liquidity include cash provided by operating activities and borrowings under our Credit Facility. On April 18, 2025, we entered into the Fourth Amendment which provides us with up to $400.0 million in borrowing commitments with an additional $100.0 million at our request through an accordion feature. 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. As of June 30, 2025, the borrowing base under the Credit Facility was $354.3 million with $182.0 million of borrowings outstanding leaving $172.3 million of availability under the Credit Facility.
Our cash flows from operating and investing activities are subject to a degree of volatility due primarily to (i) the consistency of our customers in remitting amounts owed to us for our services in full and on a timely basis and (ii) the timing of payments to our vendors and suppliers for capital projects which are often made well in advance of placing new compressor equipment into service. In order to mitigate such volatility we employ disciplined efforts to monitor customer credit and maintain communications to support collection efforts when necessary. To the extent necessary, we rely on the availability of our Credit Facility to fund capital expenditures beyond that provided by our cash flows from operating activities.
Our forecasted capital expenditures for 2025 will continue to be directly dependent upon our customers’ compression requirements and our capital availability, while maintaining prudent levels of debt.
The level of our capital expenditures will vary in future periods depending on energy market conditions and other related economic factors. Based upon existing economic and market conditions, we believe that cash on hand, cash flows from operating activities and borrowings under the Credit Facility will be sufficient to satisfy our capital, dividend and liquidity requirements for at least the twelve months subsequent to the date that this Quarterly Report on Form 10-Q was filed. We also believe we have flexibility with respect to our financing alternatives and can make adjustments to our capital expenditure plans if circumstances warrant. We do not have any material continuing commitments related to our current operations that cannot be met with our cash on hand, cash from operating activities and borrowings under our Credit Facility.
If we require additional capital to fund any significant unanticipated expenditures, including any material acquisitions of other businesses, joint ventures or other opportunities, this additional capital could exceed our current resources and might not be available to us when we need it, or might not be on acceptable terms. In addition, our financing capacity could be negatively impacted by other economic factors.
For a detailed analysis of our historical capital expenditures, see the “Cash Flows” discussion that follows.
Cash From Operating Activitie s. As of June 30, 2025, we had $0.3 million on hand and our cash provided by operating activities was $32.3 million for the six months ended June 30, 2025. For additional information and an analysis of our historical cash flows from operating activities, see the “Cash Flows” discussion that follows.
Credit Facility Borrowings. During the six months ended June 30, 2025, we borrowed $12.0 million, net of repayments, under the Credit Facility. The following table summarizes our borrowing activity under the Credit facility for the period presented:

| Borrowings Outstanding |  |
| End of Period |  | Weighted-average |  | Maximum |  | Weighted-average Rate
Three months ended June 30, 2025 | $ | 182,000 |  |  | $ | 175,427 |  |  | $ | 182,000 |  |  | 7.46 | %
Six months ended June 30, 2025 | $ | 182,000 |  |  | $ | 172,867 |  |  | $ | 182,000 |  |  | 7.68 | %

For additional information regarding the terms and covenants under the Credit Facility, see the “Capitalization” discussion that follows.
Proceeds from Sales and Monetization of Assets. We continually evaluate the potential sale of assets, including underutilized or retired compressor units, obsolete and slow-moving inventory and non-strategic real estate assets, among others. For additional information and an analysis of or historical proceeds from sales of assets, see the “Cash Flows” discussion that follows.
Capital Markets Transactions. From time-to-time and under market conditions that we believe are favorable to us, we may consider capital markets transactions, including the offering of debt and equity securities. We maintain an effective shelf registration statement with the SEC for up to $200 million for a variety of securities to provide financing optionality.
25

Cash flows
The following table summarizes our cash flows for the periods presented:

| Six months ended June 30,
| 2025 |  | 2024
Net cash provided by operating activities | $ | 32,263 |  |  | $ | 31,119 |
Net cash used in investing activities | (44,962) |  |  | (27,881) |
Net cash (used in) provided by financing activities | 10,882 |  |  | (2,368) |
Net increase in cash and cash equivalents | $ | (1,817) |  |  | $ | 870 |

Cash Flows from Operating Activities. Our cash flows from operating activities increased by $1.1 million during the six months ended June 30, 2025, as compared to the comparable period in 2024. From a broad perspective, cash flows improved due to: (i) growth in accounts payable, (ii) substantial progress in improving our processes for billings and collections from certain customers and lowering our “days sales outstanding” statistics for accounts receivable and (iii) higher realized margins attributable to growth in our high horsepower unit rentals. Our accounts receivable efforts arose from the negative impact on working capital during 2023 and into 2024 as our rental activities began to grow significantly. We anticipate a continued focus on these efforts throughout 2025 as we concentrate on further improvements to our working capital performance statistics.
Cash Flows from Investing Activities. For the six months ended June 30, 2025, and 2024, we invested approximately $45.1 million and $28.3 million, respectively, in rental equipment, property and other equipment. Included in these totals for 2025 and 2024 were $41.2 million and $28.2 million in new equipment to our rental fleet and $3.9 million and less than $0.1 million in other property and equipment, respectively. Our investment in rental equipment includes any changes to work-in-progress related to our rental fleet projects at the beginning of the year compared to the end of the year.
Cash Flows from Financing Activities. During the six months ended June 30, 2025 we had net borrowings of $12.0 million and for the six months ended June 30, 2024, we had net repayments of $1.0 million under the Credit Facility.
Capitalization
The following table summarizes our total capitalization as of the dates presented:

| June 30, |  | December 31,
| 2025 |  | 2024
Credit facility borrowings | $ | 182,000 |  |  | $ | 170,000 |
Total stockholders’ equity | 266,214 |  |  | 255,057 |
Total capitalization | $ | 448,214 |  |  | $ | 425,057 |
Debt as a percent of total capitalization | 40.6 | % |  | 40.0 | %

Credit Facility. We have a senior secured revolving credit agreement, as amended, or the Credit Facility, with Texas Capital Bank, National Association (the “Lender”) as administrative agent, and TCBI Securities, Inc., Bank of America, N.A., and the Huntington National Bank as joint lead arrangers and joint book runners, with a total commitment of $400.0 million. We also have a right to request from the Lender, 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 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.
Our Credit Facility is subject to: (i) a borrowing base calculation, (ii) variable rates of interest on borrowings that are determined, in part, upon our actual leverage ratio, as defined in the Credit Facility, (iii) commitment fees, (iv) certain financial and other covenants and (v) events of default and acceleration, among other terms and conditions that are customary for such credit instruments. Please see Note 9 (“Long-Term Debt”) to our Condensed Consolidated Financial Statements for a thorough discussion of these matters regarding our Credit Facility.
As of June 30, 2025 we had $182.0 million outstanding under our Credit Facility with a weighted average interest rate of 7.23%. As of June 30, 2025, we had approximately $172.3 million available for borrowing under the Credit Facility, subject to a borrowing base determination. As of June 30, 2025, we were in compliance with all financial covenants in our Credit Facility.
26

Critical Accounting Estimates
The preparation of our Condensed Consolidated Financial Statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue, expenses and related disclosures. In the ordinary course of business, we have made a number of estimates and assumptions relating to the reporting of results of operations and financial condition in the preparation of our Condensed Consolidated Financial Statements. We evaluate our estimates and assumptions on an ongoing basis. Our estimates are generally based on historical experience and various other assumptions that we believe to be reasonable in consideration of our circumstances and expectations for the future based on available information. Our actual results could differ significantly from those estimates under different assumptions and conditions.
We consider an accounting estimate to be critical if: (i) the accounting estimate requires us to make assumptions about matters that were highly uncertain at the time the accounting estimate was made, and (ii) changes in the estimate that are reasonably likely to occur from period to period or use of different estimates that we reasonably could have used in the current period, would have a material impact on our financial condition or results of operations.
There have been no changes to the critical accounting estimates disclosed in our Form 10-K for the year ended December 31, 2024.
Recently Issued Accounting Pronouncements
Please see Note 2, (“Summary of Significant Accounting Policies”) to our Condensed Consolidated Financial Statements for a discussion of recently issued accounting pronouncements.
Off-Balance Sheet Arrangements
From time-to-time, we enter into off-balance sheet arrangements and transactions that can give rise to off-balance sheet obligations. As of June 30, 2025, the off-balance sheet arrangements and transactions that we have entered into include purchase agreements for certain compressor unit components that are fully anticipated consistent with our capital expenditure plans. We do not believe that these arrangements are reasonably likely to materially affect our liquidity or availability of capital resources.
27

Item 3. Quantitative and Qualitative Disclosures about Market Risk
There have been no changes in the market risks disclosed in our Form 10-K for the year ended December 31, 2024.
Item 4. Controls and Procedures
Evaluation of Disclosure Controls and Procedures.
Our management, including the Chief Executive Officer and our Chief Financial Officer, is responsible for establishing and maintaining adequate internal control over financial reporting (“ICFR”), as defined in Rule 13a-15(f) and 15d-15(f) under the Exchange Act. Our internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of the consolidated financial statements for external purposes in accordance with GAAP.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Our management conducted an evaluation of the effectiveness of the Company’s internal control over financial reporting as of June 30, 2025, based on the Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission, or COSO.
Based on the results of this evaluation, the Company’s management concluded that internal control over financial reporting was effective as of June 30, 2025.
Changes in Internal Control over Financial Reporting
During the three months ended June 30, 2025, there were no changes in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect our internal control over financial reporting.
28

PART II – OTHER INFORMATION
Item 1. Legal Proceedings
From time to time, we are a party to various legal proceedings in the ordinary course of our business. While management is unable to predict the ultimate outcome of these actions, it believes that any ultimate liability arising from these actions will not have a material effect on our financial position, results of operations or cash flow. We are not currently a party to any bankruptcy, receivership, reorganization, adjustment or similar proceeding, and we are not aware of any material threatened litigation.
Item 1A. Risk Factors
Please refer to and read Item 1A, Risk Factors in our Annual Report on Form 10-K for the fiscal year ended December 31, 2024 for a discussion of the risks associated with our Company and the industry in which we operate. We may experience additional risks and uncertainties not currently known to us. Further, as a result of developments occurring in the future, conditions that we currently deem to be immaterial may also materially and adversely affect us. Any such risks may materially and adversely affect our business, financial condition, cash flows, and results of operations
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds
None.
Item 3. Defaults Upon Senior Securities
None.
Item 4. Mine Safety Disclosures
None.
Item 5. Other Information
On May 16, 2025, Stephen C. Taylor, a member of our Board of Directors, adopted a Rule 10b5-1 trading agreement that is intended to satisfy the affirmative defense of Rule 10b5-1(c) for the sale of up to an aggregate of 100,000 shares of the Company’s common stock, subject to various volume amounts and price thresholds. The plan becomes effective on August 15, 2025 and terminates on September 30, 2026, unless sooner terminated under its terms. The 10b5-1 Plan was entered into during an open insider trading window and no sales will commence under the plan until completion of the required cooling off period under Rule 10b5-1.
No other director or officer of the Company adopted, modified or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408(a) of Regulation S-K, during the three months ended June 30, 2025.
.
29

Item 6. Exhibits
The following exhibits are filed herewith or incorporated herein by reference, as indicated:

Exhibit No. | Description

4.3 | Natural Gas Services Group, Inc. 2019 Equity Incentive Plan, as amended (incorporated by reference to Exhibit 4.3 of the Registrant’s Registration Statement on Form S-8 filed with the Securities and Exchange Commission on June 16, 2025).
10.1 | Fourth Amendment to Amended and Restated Credit Agreement dated April 18, 2025 among Natural Gas Services Group, Inc. the other Loan Parties thereto, Texas Capital Bank, in its capacity as Administrative Agent and the Lenders Party thereto.
31.1* | Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2* | Certification of Principal Accounting Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1** | Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2** | Certification of Principal Accounting Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

101.INS | XBRL Instance Document
101.SCH | XBRL Taxonomy Extension Schema Document
101.CAL | XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF | XBRL Taxonomy Extension Definition Linkbase Document
101.LAB | XBRL Taxonomy Extension Label Linkbase Document
101.PRE | XBRL Taxonomy Extension Presentation Linkbase Document
| * Filed herewith.
| ** Furnished herewith.

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.
NATURAL GAS SERVICES GROUP, INC.

/s/ Justin C. Jacobs |  | /s/ Ian M. Eckert |
Justin C. Jacobs |  | Ian M. Eckert |
Chief Executive Officer and Director |  | Chief Financial Officer |
(Principal Executive Officer) |  | (Principal Accounting Officer) |
August 11, 2025 |  | August 11, 2025 |