Earnings release
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ONE Gas August 4 , 2026 News Analyst Contact : Erin Dailey 918-947-7441 Media Contact : Leah Harper 918-947-7123 Exhibit 99.1 ONE Gas Announces Second Quarter 2026 Financial Results ; Raises 2026 Adjusted Earnings Expectations to Upper Half of Financial Guidance Ranges Declares Third Quarter Dividend Analyst call and webcast scheduled tomorrow , Aug. 5 at 11 a.m. EDT TULSA , Okla . - Aug. 4 , 2026 - ONE Gas , Inc. ( NYSE : OGS ) today announced its second quarter financial results and raised its 2026 adjusted earnings expectations to the upper half of the previously announced financial guidance ranges . The Company also declared its quarterly dividend . " Our strong second quarter and first - half results reflect the continued execution of our growth strategy and the benefits of operating in constructive jurisdictions . This performance gives us the confidence to raise our adjusted earnings expectations for the full year , " said Robert S. McAnnally , chief executive officer . " We delivered these results while maintaining our focus on reliability and affordability for customers and creating long - term value for shareholders . " FINANCIAL RESULTS & HIGHLIGHTS • • • • The Company raised its 2026 adjusted net income and earnings per diluted share expectations to the upper half of the respective $ 306 million to $ 314 million and $ 4.83 to $ 4.95 ranges ; Second quarter 2026 adjusted net income was $ 52.1 million , or $ 0.82 per diluted share , compared with $ 32.7 million , or $ 0.54 per diluted share , in the same period last year ; Year - to - date 2026 adjusted net income was $ 185.5 million , or $ 2.94 per diluted share , compared with $ 152.8 million , or $ 2.53 per diluted share , in 2025 ; Second quarter 2026 net income was $ 46.8 million , or $ 0.74 per diluted share , compared with $ 32.0 million , or $ 0.53 per diluted share , in the same period last year ; Year - to - date 2026 net income was $ 175.5 million , or $ 2.78 per diluted share , compared with $ 151.5 million , or $ 2.51 per diluted share , in 2025 ; and -more-
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ONE Gas Announces Second Quarter and Year-to-Date 2026 Financial Results; August 4, 2026 Page 2 • The board of directors declared a quarterly dividend of $0.68 per share ($2.72 annualized), payable on August 31, 2026, to shareholders of record at the close of business on August 17, 2026. SECOND QUARTER 2026 FINANCIAL PERFORMANCE ONE Gas reported operating income of $82.7 million in the second quarter, compared with $71.9 million in the second quarter 2025, which primarily reflects: • an increase of $16.4 million in revenue from new rates; • an increase of $1.4 million in residential sales due primarily to net customer growth in Oklahoma and Texas; and • an increase of $1.3 million in line extension revenue in Oklahoma. These increases were partially offset by: • an increase of $7.4 million in employee-related costs; • an increase of $1.1 million in outside services; and • an increase of $1.1 million in fleet expense. Weather was 42 percent warmer than normal and 28 percent warmer than the prior year for the three months ended June 30, 2026. The impact on operating income was mitigated by weather normalization mechanisms. Excluding interest related to KGSS-I securitized bonds, net interest expense decreased $3.8 million for the three months ending June 30, 2026. The decrease in interest expense is due primarily to commercial paper borrowings at lower rates and the implementation of Texas House Bill 4384. Income tax expense includes a credit for amortization of the regulatory liability associated with excess deferred income taxes (EDIT) of $3.3 million and $2.1 million for the three months ended June 30, 2026, and 2025, respectively. Capital expenditures and asset removal costs were $188.3 million for the second quarter 2026 compared with $190.1 million in the same period last year, primarily representing expenditures for system integrity and extension of service to new areas. YEAR-TO-DATE 2026 FINANCIAL PERFORMANCE Operating income for the six months ended June 30, 2026, was $272.3 million, compared with $252.4 million in 2025, which primarily reflects: • an increase of $43.7 million from new rates; • an increase of $3.2 million in residential sales due primarily to net customer growth in Oklahoma and Texas; and • an increase of $1.8 million from released transportation capacity to other shippers in Kansas. -more-
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ONE Gas Announces Second Quarter and Year-to-Date 2026 Financial Results; August 4, 2026 Page 3 These increases were partially offset by: • an increase of $13.2 million in employee-related costs; • an increase of $3.4 million in outside services; • an increase of $1.3 million in fleet expense; and • a decrease of $10.6 million in revenue due to lower sales and transport volumes, net of the impact of weather normalization mechanisms. Weather was 23 percent warmer than normal and 25 percent warmer than the prior year for the six months ended June 30, 2026. The impact on operating income was mitigated by weather normalization mechanisms. Excluding interest related to KGSS-I securitized bonds, net interest expense decreased $6.7 million for the six months ended June 30, 2026. The decrease in interest expense is due primarily to commercial paper borrowings at lower rates and the implementation of Texas House Bill 4384. Income tax expense includes a credit for amortization of the regulatory liability associated with EDIT of $12.8 million and $10.2 million for the six months ended June 30, 2026, and 2025, respectively. Capital expenditures and asset removal costs were $357.9 million for the six-month 2026 period compared with $367.8 million in the same period last year, primarily representing expenditures for system integrity and extension of service to new areas. REGULATORY ACTIVITIES UPDATE In July 2026, Kansas Gas Service submitted an application to the Kansas Corporation Commission requesting an increase of approximately $14.3 million related to its Gas System Reliability Surcharge to be effective October 2026. The filing includes expanded infrastructure investments as defined by Kansas House Bill 2435. In March 2026, Texas Gas Service made a Gas Reliability Infrastructure Program filing for all customers requesting a $36.9 million revenue increase to be effective in July 2026. In June 2026, the Texas Railroad Commission approved an increase of $36.9 million, and new rates became effective in July 2026. In February 2026, Oklahoma Natural Gas filed its annual Performance-Based Rate Change (PBRC) application for the test year ended December 2025. The filing includes a requested $28.7 million base rate revenue increase, $2.6 million energy efficiency incentive and $14.4 million of estimated EDIT to be credited to customers in 2027. At the hearing on June 11, 2026, the administrative law judge recommended approval of the application as filed. Subsequent to the hearing, exceptions to the administrative law judge’s oral ruling were filed at the Oklahoma Corporation Commission as well as an appeal to the Oklahoma Supreme Court. Interim rates subject to refund were implemented on June 26, 2026, in compliance with the PBRC tariff. -more-
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ONE Gas Announces Second Quarter and Year-to-Date 2026 Financial Results; August 4, 2026 Page 4 2026 FINANCIAL GUIDANCE Based on strong performance during the first half of 2026 and anticipated benefits associated with Texas House Bill 4384, the Company has raised its 2026 adjusted earnings expectations to the upper half of its previously issued 2026 financial guidance ranges, which called for adjusted net income of $306 million to $314 million and adjusted net income per diluted share of $4.83 to $4.95. Capital investments, including asset removal costs, are expected to be approximately $800 million in 2026, primarily targeted for system integrity and replacement projects. Capital investments for extensions to new customers are expected to be approximately $230 million of the $800 million. EARNINGS CONFERENCE CALL AND WEBCAST The ONE Gas executive management team will host a conference call on Wednesday, August 5, 2026, at 11 a.m. Eastern Daylight Time (10 a.m. Central Daylight Time). The call also will be carried live on the ONE Gas website. To participate in the telephone conference call, dial 800-715-9871, passcode 3280987, or log on to www.onegas.com/investors and select Events and Presentations. If you are unable to participate in the conference call or the webcast, a replay will be available on the ONE Gas website, www.onegas.com, for 30 days. A recording will be available by phone for seven days. The playback call may be accessed at 1-800-770-2030, passcode 3280987. NON-GAAP DISCLOSURE STATEMENT This news release includes financial results and guidance for ONE Gas with respect to adjusted net income and adjusted net income per share, which are non-GAAP financial measures as defined by the Securities and Exchange Commission. Adjusted net income and adjusted net income per share are calculated as GAAP net income plus the deferral of an equity portion of a carrying cost attributable to shareholders' investment capitalized for regulatory purposes but not for financial reporting purposes. These carrying costs relate to property, plant and equipment that has been placed in service, but not yet reflected in rates. Adjusted net income and adjusted net income per share should not be considered in isolation or as a substitute for GAAP net income or GAAP earnings per share. Management believes these non ‑ GAAP measures provide useful information because they offer a more complete view of our overall regulatory economics, reflect the period-specific effects of certain regulatory mechanisms designed to mitigate regulatory lag associated with property, plant and equipment placed in service prior to regulatory action, and reflect the impact of regulatory timing differences that arise under the Company's rate-setting framework. These adjustments, net of applicable tax effects, are expected to recur as a result of the Company's regulatory framework and are a consistent part of our earnings profile. A reconciliation of the Company's GAAP net income and GAAP earnings per share to adjusted net income and adjusted net income per share is provided in the Appendix. -more-
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ONE Gas Announces Second Quarter and Year-to-Date 2026 Financial Results; August 4, 2026 Page 5 --------------------------------------------------------------------------------------------------------------------- ONE Gas, Inc. (NYSE: OGS) is a 100% regulated natural gas utility, and trades on the New York Stock Exchange and the NYSE Texas under the symbol “OGS.” ONE Gas is included in the S&P MidCap 400 Index and is one of the largest natural gas utilities in the United States. Headquartered in Tulsa, Oklahoma, ONE Gas provides a reliable and affordable energy choice to more than 2.3 million customers in Kansas, Oklahoma and Texas. Its divisions include Kansas Gas Service, the largest natural gas distributor in Kansas; Oklahoma Natural Gas, the largest in Oklahoma; and Texas Gas Service, the third largest in Texas, in terms of customers. For more information and the latest news about ONE Gas, visit onegas.com and follow its social channels: @ONEGas, Facebook, LinkedIn and YouTube. Some of the statements contained and incorporated in this news release are forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. The forward-looking statements relate to our anticipated financial performance, liquidity, management’s plans and objectives for our future operations, our business prospects, the outcome of regulatory and legal proceedings, market conditions and other matters. We make these forward-looking statements in reliance on the safe harbor protections provided under the Private Securities Litigation Reform Act of 1995. The following discussion is intended to identify important factors that could cause future outcomes to differ materially from those set forth in the forward-looking statements. Forward-looking statements include the items identified in the preceding paragraph, the information concerning possible or assumed future results of our operations and other statements contained or incorporated in this news release identified by words such as "anticipate," "estimate," "expect," "project," "intend," "plan," "believe," "should," "goal," "forecast," "guidance," "could," "may," "continue," "might," "potential," "scheduled," "likely," and other words and terms of similar meaning. One should not place undue reliance on forward-looking statements, which are applicable only as of the date of this news release. Known and unknown risks, uncertainties and other factors may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by forward-looking statements. Those factors may affect our operations, costs, liquidity, markets, products, services and prices. In addition to any assumptions and other factors referred to specifically in connection with the forward-looking statements, factors that could cause our actual results to differ materially from those contemplated in any forward-looking statement include, among others, the following: • our ability to recover costs, income taxes and amounts equivalent to the cost of property, plant and equipment, regulatory assets and our allowed rate of return in our regulated rates or other recovery mechanisms; • cyber-attacks, which, according to experts, continue to increase in volume and sophistication, or breaches of technology systems that could disrupt our operations or result in the loss or exposure of confidential or sensitive customer, employee, vendor, counterparty, or Company information; further, increased remote working arrangements have required enhancements and modifications to our information technology infrastructure (e.g. Internet, Virtual Private Network, remote collaboration systems, etc.), and any failures of the technologies, including third-party service providers, that facilitate working remotely could limit our ability to conduct ordinary operations or expose us to increased risk or effect of an attack; • our ability to manage our operations and maintenance costs; • changes in regulation of natural gas distribution services, particularly those in Oklahoma, Kansas and Texas; • the economic climate and, particularly, its effect on the natural gas requirements of our residential and commercial customers; • the length and severity of a pandemic or other health crisis which could significantly disrupt or prevent us from operating our business in the ordinary course for an extended period; • competition from alternative forms of energy, including, but not limited to, electricity, solar power, wind power, geothermal energy and biofuels; • adverse weather conditions and variations in weather, including seasonal effects on demand and/or supply, the occurrence of severe storms in the territories in which we operate, climate change, and the related effects on supply, demand, and costs; • indebtedness could make us more vulnerable to general adverse economic and industry conditions, limit our ability to borrow additional funds and/or place us at competitive disadvantage compared with competitors; • our ability to secure reliable, competitively priced and flexible natural gas transportation, storage, and supply, including decisions by natural gas producers to reduce production or shut-in producing natural gas wells and expiration of existing supply and transportation and storage arrangements that are not replaced with contracts with similar terms and pricing; • our ability to complete necessary or desirable expansion or infrastructure development projects, which may delay or prevent us from serving our customers or expanding our business; -more-
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ONE Gas Announces Second Quarter and Year-to-Date 2026 Financial Results; August 4, 2026 Page 6 • operational and mechanical hazards or interruptions; • adverse labor relations; • the effectiveness of our strategies to reduce earnings lag, revenue protection strategies and risk mitigation strategies, which may be affected by risks beyond our control such as commodity price volatility, counterparty performance or creditworthiness and interest rate risk; • the capital-intensive nature of our business, and the availability of and access to, in general, funds to meet our debt obligations prior to or when they become due and to fund our operations and capital expenditures, either through (i) cash on hand, (ii) operating cash flow, or (iii) access to the capital markets and other sources of liquidity; • our ability to obtain capital on commercially reasonable terms, or on terms acceptable to us, or at all; • limitations on our operating flexibility, earnings and cash flows due to restrictions in our financing arrangements; • cross-default provisions in our borrowing arrangements, which may lead to our inability to satisfy all of our outstanding obligations in the event of a default on our part; • changes in the financial markets during the periods covered by the forward-looking statements, particularly those affecting the availability of capital and our ability to refinance existing debt and fund investments and acquisitions to execute our business strategy; • actions of rating agencies, including the ratings of debt, general corporate ratings and changes in the rating agencies’ ratings criteria; • changes in inflation and interest rates; • our ability to recover the costs of upstream transportation, storage, and natural gas purchased for our customers and any related financing required to support our purchase of natural gas supply; • impact of potential impairment charges; • volatility and changes in markets for natural gas and our ability to secure additional and sufficient liquidity on reasonable commercial terms to cover costs associated with such volatility; • possible loss of local distribution company franchises or other adverse effects caused by the actions of municipalities; • payment and performance by counterparties and customers as contracted and when due, including our counterparties maintaining ordinary course terms of supply and payments; • changes in existing or the addition of new environmental, safety, tax, cybersecurity and other laws or regulations to which we and our subsidiaries are subject, including those that may require significant expenditures, significant increases in operating costs or, in the case of noncompliance, substantial fines or penalties; • the effectiveness of our risk-management policies and procedures, and employees violating our risk-management policies; • the uncertainty of estimates, including accruals and costs of environmental remediation; • advances in technology, including technologies that increase efficiency or that improve electricity’s competitive position relative to natural gas; • population growth rates and changes in the demographic patterns of the markets we serve in Oklahoma, Kansas and Texas, and economic conditions in these areas; • acts of nature and naturally occurring disasters; • political unrest and the potential effects of threatened or actual terrorism and war; • the sufficiency of insurance coverage to cover losses; • the effects of our strategies to reduce tax payments; • changes in accounting standards; • changes in corporate governance standards; • existence of material weaknesses in our internal controls; • our ability to comply with all covenants in our indentures and the ONE Gas Credit Agreement, a violation of which, if not cured in a timely manner, could trigger a default of our obligations; • our ability to attract and retain talented employees, management and directors, and shortage of skilled-labor; • unexpected increases in the costs of providing health care benefits, along with pension and postemployment health care benefits, as well as declines in the discount rates on, declines in the market value of the debt and equity securities of, and increases in funding requirements for, our defined benefit plans; and • our ability to successfully complete merger, acquisition or divestiture plans, regulatory or other limitations imposed as a result of a merger, acquisition or divestiture, and the success of the business following a merger, acquisition or divestiture. These factors are not necessarily all of the important factors that could cause actual results to differ materially from those expressed in any of our forward-looking statements. Other factors could also have material adverse effects on our future results. These and other risks are described in greater detail in Part 1, Item 1A, Risk Factors, in our Annual Report. All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by these factors. Other than as required under securities laws, we undertake no obligation to update publicly any forward-looking statement whether as a result of new information, subsequent events or change in circumstances, expectations or otherwise. -more-
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ONE Gas Announces Second Quarter and Year-to-Date 2026 Financial Results; August 4, 2026 Page 7 APPENDIX ONE Gas, Inc. CONSOLIDATED STATEMENTS OF INCOME Three Months Ended Six Months Ended June 30, June 30, (Unaudited) 2026 2025 2026 2025 (Thousands of dollars, except per share amounts) Total revenues $ 411,639 $ 423,741 $ 1,243,350 $ 1,358,931 Cost of natural gas 90,287 117,942 483,863 630,404 Operating expenses Operations and maintenance 139,628 130,987 286,575 266,282 Depreciation and amortization 76,240 79,314 153,025 161,018 General taxes 22,813 23,643 47,624 48,873 Total operating expenses 238,681 233,944 487,224 476,173 Operating income 82,671 71,855 272,263 252,354 Other income (expense), net 5,220 2,572 3,123 3,090 Interest expense, net (31,101) (35,279) (63,459) (70,976) Income before income taxes 56,790 39,148 211,927 184,468 Income taxes (9,982) (7,115) (36,446) (33,016) Net income $ 46,808 $ 32,033 $ 175,481 $ 151,452 Earnings per share Basic $ 0.74 $ 0.53 $ 2.79 $ 2.52 Diluted $ 0.74 $ 0.53 $ 2.78 $ 2.51 Average shares (thousands) Basic 62,959 60,113 62,936 60,095 Diluted 63,153 60,455 63,178 60,361 Dividends declared per share of stock $ 0.68 $ 0.67 $ 1.36 $ 1.34 -more-
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ONE Gas Announces Second Quarter and Year-to-Date 2026 Financial Results; August 4, 2026 Page 8 APPENDIX ONE Gas, Inc. CONSOLIDATED BALANCE SHEETS June 30, December 31, (Unaudited) 2026 2025 Assets (Thousands of dollars) Property, plant and equipment Property, plant and equipment $ 9,998,502 $ 9,734,150 Accumulated depreciation and amortization 2,678,316 2,611,952 Net property, plant and equipment 7,320,186 7,122,198 Current assets Cash and cash equivalents 7,858 10,620 Restricted cash and cash equivalents 22,711 23,107 Total cash, cash equivalents and restricted cash and cash equivalents 30,569 33,727 Accounts receivable, net 250,861 461,631 Materials and supplies 96,672 97,595 Income tax receivable — 55,552 Natural gas in storage 158,219 176,451 Regulatory assets 83,367 49,504 Prepaid expenses 33,823 34,224 Other current assets 8,326 7,200 Total current assets 661,837 915,884 Goodwill and other assets Regulatory assets 250,704 256,225 Securitized intangible asset, net 218,991 233,786 Goodwill 157,953 157,953 Pension and other postemployment benefits 47,326 47,012 Other assets 155,206 120,026 Total goodwill and other assets 830,180 815,002 Total assets $ 8,812,203 $ 8,853,084 APPENDIX -more-
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ONE Gas Announces Second Quarter and Year-to-Date 2026 Financial Results; August 4, 2026 Page 9 ONE Gas, Inc. CONSOLIDATED BALANCE SHEETS (Continued) June 30, December 31, (Unaudited) 2026 2025 Equity and Liabilities (Thousands of dollars) Equity and long-term debt Common stock, $0.01 par value: authorized 250,000,000 shares; issued and outstanding 62,797,154 sharesat June 30, 2026; issued and outstanding 62,692,392 shares at December 31, 2025$ 629 $ 627 Paid-in capital 2,539,068 2,530,137 Retained earnings 998,454 909,355 Accumulated other comprehensive income (loss) (265) 4 Total equity 3,537,886 3,440,123 Other long-term debt, excluding current maturities, net of issuance costs 2,133,688 2,133,018 Securitized utility tariff bonds, excluding current maturities, net of issuance costs 207,115 223,020 Total long-term debt, excluding current maturities, net of issuance costs 2,340,803 2,356,038 Total equity and long-term debt 5,878,689 5,796,161 Current liabilities Current maturities of other long-term debt, net of issuance costs 249,918 249,674 Current maturities of securitized utility tariff bonds, net of issuance costs 31,404 30,566 Notes payable 770,800 737,400 Accounts payable 110,952 222,102 Accrued taxes other than income 57,395 75,568 Regulatory liabilities 24,702 57,277 Customer deposits 53,373 52,871 Other current liabilities 77,911 106,400 Total current liabilities 1,376,455 1,531,858 Deferred credits and other liabilities Deferred income taxes 1,012,944 963,874 Regulatory liabilities 433,135 451,620 Other deferred credits 110,980 109,571 Total deferred credits and other liabilities 1,557,059 1,525,065 Commitments and contingencies Total liabilities and equity $ 8,812,203 $ 8,853,084 -more-
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ONE Gas Announces Second Quarter and Year-to-Date 2026 Financial Results; August 4, 2026 Page 10 APPENDIX ONE Gas, Inc. CONSOLIDATED STATEMENTS OF CASH FLOWS Six Months EndedJune 30, (Unaudited) 2026 2025 (Thousands of dollars) Operating activities Net income $ 175,481 $ 151,452 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization 153,025 161,018 Deferred income taxes 32,478 23,684 Share-based compensation expense 8,174 7,524 Provision for doubtful accounts 5,026 4,085 Changes in assets and liabilities: Accounts receivable 205,744 141,290 Materials and supplies 923 (3,886) Income tax receivable 55,552 — Natural gas in storage 18,232 26,736 Asset removal costs (27,861) (20,718) Accounts payable (108,977) (121,593) Accrued taxes other than income (18,173) (16,159) Customer deposits 502 (2,235) Regulatory assets and liabilities - current (74,156) 78,329 Regulatory assets and liabilities - noncurrent 3,691 21,198 Other assets and liabilities - current (28,437) (12,271) Other assets and liabilities - noncurrent (13,893) 10,355 Cash provided by operating activities 387,331 448,809 Investing activities Capital expenditures (330,035) (347,065) Other investing expenditures (6,691) (4,075) Other investing receipts 6,982 2,629 Cash used in investing activities (329,744) (348,511) Financing activities Borrowings (repayments) of notes payable, net 33,400 (42,200) Issuance of common stock 3,894 3,561 Repayment of other long-term debt (7) (8) Repayment of securitized utility tariff bonds (15,356) (14,547) Dividends paid (85,356) (80,306) Tax withholdings related to net share settlements of stock compensation (4,161) (2,614) Construction advances 6,841 — Cash used in financing activities (60,745) (136,114) Change in cash, cash equivalents, restricted cash and restricted cash equivalents (3,158) (35,816) Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period33,727 78,537 Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period$ 30,569 $ 42,721 Supplemental cash flow information: Cash paid for interest, net of amounts capitalized $ 62,407 $ 69,972 Cash paid (received) for state income taxes $ 1,150 $ 715 Cash paid (received) for federal income taxes $ (50,302)$ 7,013 -more-
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ONE Gas Announces Second Quarter and Year-to-Date 2026 Financial Results; August 4, 2026 Page 11 APPENDIX The following table reconciles the Company’s GAAP net income and GAAP earnings per share to adjusted net income and adjusted net income per share: ONE Gas, Inc. Three Months Ended Six Months Ended June 30, June 30, 2026 2025 2026 2025 (Thousands of dollars, except per share amounts) Net income - GAAP $ 46,808$ 32,033$ 175,481 $ 151,452 Other income - deferred carrying cost 5,257 653 9,982 1,301 Income taxes — — — — Adjusted net income - non-GAAP $ 52,065 $ 32,686 $ 185,463 $ 152,753 Earnings per share - GAAP Basic $ 0.74 $ 0.53 $ 2.79 $ 2.52 Diluted $ 0.74 $ 0.53 $ 2.78 $ 2.51 Adjusted net income per share - non-GAAP Basic $ 0.83 $ 0.54 $ 2.95 $ 2.54 Diluted $ 0.82 $ 0.54 $ 2.94 $ 2.53 Average shares (thousands) Basic 62,959 60,113 62,936 60,095 Diluted 63,153 60,455 63,178 60,361 (a) The allowance for earnings on shareholders’ investment capitalized for regulatory purposes but not for financial reporting purposes applied toproperty, plant and equipment placed in service, but not yet reflected in Texas rates, as authorized by our regulators or state law. Property, plant andequipment placed in service may vary by quarter based on the timing and complexity of projects, weather impacts, construction completion schedules,contractor activities, and other operational factors. During the three months ended June 30, 2026, we placed $53.8 million of property, plant andequipment in service eligible for this treatment, compared with $62.6 million in the same period last year. For the six months ended June 30, 2026, weplaced $125.3 million of property, plant and equipment in service eligible for this treatment, compared with $125.5 million in the same period lastyear.(b) This deferred carrying cost increases book income but is non-taxable, creating a permanent tax difference. ONE Gas, Inc. 2026 Financial Guidance: Reconciliation of non-GAAP to GAAP: Low Mid High (Thousands of dollars, except per share amounts) Net income - GAAP $ 294,000 $ 298,000 $ 302,000 Other income - deferred carrying cost 11,890 11,919 12,000 Income taxes — — — Adjusted net income - non-GAAP $ 305,890 $ 309,919 $ 314,000 Earnings per share - GAAP Basic $ 4.67 $ 4.73 $ 4.79 Diluted $ 4.65 $ 4.71 $ 4.77 Adjusted net income per share - non-GAAP Basic $ 4.86 $ 4.92 $ 4.98 Diluted $ 4.83 $ 4.89 $ 4.95 Average shares (thousands) Basic 62,995 62,995 62,995 Diluted 63,350 63,350 63,350 (a) The allowance for earnings on shareholders’ investment capitalized for regulatory purposes but not for financial reporting purposes applied toproperty, plant and equipment placed in service, but not yet reflected in Texas rates, as authorized by our regulators or state law. Property, plant andequipment placed in service may vary by quarter based on the timing and complexity of projects, weather impacts, construction completion schedules,contractor activities, and other operational factors.(b) This deferred carrying cost increases book income but is non-taxable, creating a permanent tax difference. (a) (b) (a) (b) -more-
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ONE Gas Announces Second Quarter and Year-to-Date 2026 Financial Results; August 4, 2026 Page 12 APPENDIX ONE Gas, Inc.KGSS-I SECURITIZATION In November 2022, Kansas Gas Service Securitization I, L.L.C. (KGSS-I) issued $336 million of securitized utility tariff bonds. KGSS-I used the proceeds from the issuance to purchase the Securitized Utility Tariff Property from Kansas Gas Service, pay for debt issuance costs, and reimburse Kansas Gas Service for upfront securitization costs paid on behalf of KGSS-I. Revenues for the three months ended June 30, 2026, include $10.9 million associated with KGSS-I, which is offset by $7.5 million in operating and amortization expense and $3.4 million in interest expense, net. Compared to the same three month period last year, revenues decreased $2.3 million, interest expense, net, decreased $0.4 million, and operating and amortization expense decreased $1.9 million. Revenues for the six months ended June 30, 2026, include $21.9 million associated with KGSS-I, which is offset by $15.0 million in operating and amortization expense and $6.8 million in interest expense, net. Compared to the same twelve month period last year, revenues decreased $3.0 million, interest expense, net, decreased $0.8 million, and amortization and operating expense decreased $2.2 million. The following table summarizes the impact of KGSS-I on the consolidated balance sheets, for the periods indicated: June 30, December 31, 2026 2025 (Thousands of dollars) Restricted cash and cash equivalents $ 22,711 $ 23,107 Accounts receivable 4,317 4,463 Securitized intangible asset, net 218,991 233,786 Total assets $ 246,019 $ 261,356 Current maturities of securitized utility tariff bonds, net of issuance costs $ 31,404 $ 30,566 Accounts payable 217 136 Accrued interest 5,543 5,894 Securitized utility tariff bonds, excluding current maturities, net of discounts and issuance costs $4.0 millionand $4.3 million, as of June 30, 2026, and June 30, 2025, respectively 207,115 223,020 Paid-in capital 1,680 1,680 Retained earnings 60 60 Total liabilities and equity $ 246,019 $ 261,356 -more-
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ONE Gas Announces Second Quarter and Year-to-Date 2026 Financial Results; August 4, 2026 Page 13 The following table summarizes the impact of KGSS-I on the consolidated statements of income, for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2026 2025 2026 2025 (Thousands of dollars) Operating revenues $ 10,876 $ 13,205 $ 21,853 $ 24,842 Operating expense (110) (111) (221) (221) Amortization expense (7,368) (9,292) (14,795) (16,986) Interest income 109 112 246 260 Interest expense (3,471) (3,879) (7,011) (7,823) Income before income taxes 36 35 72 72 Income taxes — (6) — — Net income $ 36 $ 29 $ 72 $ 72 -more-
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ONE Gas Announces Second Quarter and Year-to-Date 2026 Financial Results; August 4, 2026 Page 14 APPENDIX ONE Gas, Inc. INFORMATION AT A GLANCE Three Months Ended Six Months Ended June 30, June 30, (Unaudited) 2026 2025 2026 2025 (Millions of dollars) Natural gas sales $ 357.8 $ 369.5 $ 1,127.7 $ 1,239.9 Transportation revenues 31.8 31.0 71.9 74.8 Securitization customer charges 10.9 13.2 21.9 24.8 Other revenues 11.1 10.0 21.8 19.5 Total revenues $ 411.6 $ 423.7 $ 1,243.3 $ 1,359.0 Cost of natural gas 90.4 117.9 483.9 630.4 Operating costs 162.4 154.6 334.2 315.2 Depreciation and amortization 76.2 79.3 153.0 161.0 Operating income $ 82.6 $ 71.9 $ 272.2 $ 252.4 Net income $ 46.8 $ 32.0 $ 175.5 $ 151.5 Capital expenditures and asset removal costs $ 188.3 $ 190.1 $ 357.9 $ 367.8 Volumes (Bcf) Natural gas sales Residential 10.4 12.6 54.4 71.5 Commercial and industrial 5.0 5.8 20.0 25.0 Other 0.5 0.5 1.4 1.7 Total sales volumes delivered 15.9 18.9 75.8 98.2 Transportation 50.7 48.7 109.8 114.0 Total volumes delivered 66.6 67.6 185.6 212.2 Average number of customers (in thousands) Residential 2,133 2,124 2,135 2,125 Commercial and industrial 161 164 162 164 Other 3 3 3 3 Transportation 11 11 11 11 Total customers 2,308 2,302 2,311 2,303 Heating Degree Days Actual degree days 392 547 4,551 6,060 Normal degree days 678 673 5,910 5,904 Percent colder (warmer) than normal weather (42)% (19)% (23)% 3 % Statistics by State Oklahoma Average number of customers (in thousands) 936 933 937 934 Actual degree days 126 164 1,537 2,080 Normal degree days 230 230 2,028 2,027 Percent colder (warmer) than normal weather (45)% (29)% (24)% 3 % Kansas Average number of customers (in thousands) 655 656 657 657 Actual degree days 234 319 2,304 2,929 Normal degree days 397 397 2,883 2,883 Percent colder (warmer) than normal weather (41)% (20)% (20)% 2 % Texas Average number of customers (in thousands) 717 713 717 712 Actual degree days 32 64 710 1,051 Normal degree days 51 46 999 994 Percent colder (warmer) than normal weather (37)% 39 % (29)% 6 % ###