Earnings release
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Exhibit 99.1 November 2, 2026 Analyst Contact:Eric Biggers918-947-7238 Media Contact:Leah Harper918-947-7123 ONE Gas Announces Third Quarter 2026 Financial Results; Raises 2026 Adjusted Financial Guidance Above Previous Range Declares Fourth Quarter Dividend Analyst call and webcast scheduled tomorrow, Nov. 3 at 11 a.m. EST TULSA, Okla. - Nov. 2, 2026 - ONE Gas, Inc. (NYSE: OGS) today announced its third quarter financial results, raised its 2026 adjusted financial guidance and declared its quarterly dividend. "In the third quarter, we again delivered positive results and, for the second time this year, raise our 2026 financial outlook," said Robert S. McAnnally, chief executive officer. "Our 2026 financing plan is complete, and we see continued opportunity ahead as diverse large-load demand develops across our footprint. Importantly, weexpect our average 2026 customer bills to remain flat to last year." FINANCIAL RESULTS & HIGHLIGHTS • The Company raised its 2026 adjusted earnings per diluted share guidance to a range of $4.95 to $5.01, from a previous range of $4.89 to $4.95; • Third quarter 2026 adjusted net income was $33.5 million, or $0.53 per diluted share, compared with $28.6 million, or $0.47 per diluted share, in the same period last year; • Year-to-date 2026 adjusted net income was $218.9 million, or $3.47 per diluted share, compared with $181.3 million, or $3.00 per diluted share, in 2025; • Third quarter 2026 net income was $31.2 million, or $0.49 per diluted share, compared with $26.5 million, or $0.44 per diluted share, in the same period last year; • Year-to-date 2026 net income was $206.7 million, or $3.27 per diluted share, compared with $177.9 million, or $2.94 per diluted share, in 2025; • In Aug. 2026, the Company issued $375 million of 5.45 percent 10-year senior notes due Sept. 2036; and -more-
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ONE Gas Announces Third Quarter and Year-to-Date 2026 Financial Results; November 2, 2026 Page 2 • The board of directors declared a quarterly dividend of $0.68 per share ($2.72 annualized), payable on Dec. 3, 2026, to shareholders of record at the close of business on Nov. 16, 2026. THIRD QUARTER 2026 FINANCIAL PERFORMANCE ONE Gas reported operating income of $77.4 million in the third quarter, compared with $65.4 million in the third quarter 2025, which primarily reflects: • an increase of $13.5 million in revenue from new rates; and • an increase of $3.3 million in residential sales due primarily to net customer growth in Oklahoma and Texas. These increases were partially offset by: • an increase of $1.0 million in employee-related cost; and • an increase of $2.8 million in depreciation and amortization expense. Excluding interest related to KGSS-I securitized bonds, net interest expense increased $1.6 million for the three months ending September 30, 2026. The increase in interest expense is due primarily to interest on the $250 million 13-month unsecured term loan that matured in September 2026 and the issuance of $375 million 5.45 percent senior notes due September 2036. Income tax expense includes a credit for amortization of the regulatory liability associated with excess deferred income taxes (EDIT) of $2.2 million and $1.7 million for the three months ended September 30, 2026, and 2025, respectively. Capital expenditures and asset removal costs were $229.0 million for the third quarter 2026 compared with $207.6 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 nine months ended September 30, 2026, was $349.6 million, compared with $317.7 million in 2025, which primarily reflects: • an increase of $57.2 million from new rates; • an increase of $6.5 million in residential sales due primarily to net customer growth in Oklahoma and Texas; and • an increase of $2.0 million from released transportation capacity to other shippers in Kansas. -more-
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ONE Gas Announces Third Quarter and Year-to-Date 2026 Financial Results; November 2, 2026 Page 3 These increases were partially offset by: • a decrease of $11.3 million in revenue due to lower sales and transport volumes, net of the impact of weather normalization mechanisms; • an increase of $13.4 million in employee-related costs; • an increase of $3.3 million in outside services; • an increase of $2.3 million in fleet expense; and • an increase of $3.3 million in bad debt expense. Weather was 23 percent warmer than normal and 25 percent warmer than the prior year for the nine months ended September 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 $5.1 million for the nine months ended September 30, 2026. The decrease in interest expense is due primarily to lower weighted- average interest rate on commercial paper borrowings and the implementation of Texas House Bill 4384. Income tax expense includes a credit for amortization of the regulatory liability associated with EDIT of $15.0 million and $11.9 million for the nine months ended September 30, 2026, and 2025, respectively. Capital expenditures and asset removal costs were $586.9 million for the nine-month 2026 period compared with $575.4 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 (KCC) requesting an increase of approximately $14.3 million related to its Gas System Reliability Surcharge to be effective October 2026. The filing included expanded infrastructure investments as defined by Kansas House Bill 2435. On September 22, 2026, the KCC approved the application, and the new rates became effective in October 2026. 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 filed request included a $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. Interim rates subject to refund were implemented on June 26, 2026, in compliance with the PBRC tariff. The OCC issued an order approving the application on October 14, 2026. That order has been since appealed to the Oklahoma Supreme Court. -more-
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ONE Gas Announces Third Quarter and Year-to-Date 2026 Financial Results; November 2, 2026 Page 4 2026 FINANCIAL GUIDANCE Based on strong operational performance, the Company raised its 2026 adjusted earnings expectations, with net income expected to be in the range of $313 million to $317 million, compared with its previously announced range of $310 million to $314 million. Adjusted earnings per diluted share are expected to be approximately $4.95 to $5.01, compared with the previously announced range of $4.89 to $4.95. The midpoint of 2026 adjusted earnings per diluted share guidance increased to $4.98, up from the previous guidance midpoint of $4.92. Capital investments, including asset removal costs, are still 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 Tuesday, Nov. 3, 2026, at 11 a.m. Eastern Standard Time (10 a.m. Central Standard 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 Third Quarter and Year-to-Date 2026 Financial Results; November 2, 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 Third Quarter and Year-to-Date 2026 Financial Results; November 2, 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 Third Quarter and Year-to-Date 2026 Financial Results; November 2, 2026 Page 7 APPENDIX ONE Gas, Inc. CONSOLIDATED STATEMENTS OF INCOME Three Months Ended Nine Months Ended September 30, September 30, (Unaudited) 2026 2025 2026 2025 (Thousands of dollars, except per share amounts) Total revenues $ 391,313 $ 379,125 $ 1,634,663 $ 1,738,056 Cost of natural gas 73,827 76,614 557,690 707,018 Operating expenses Operations and maintenance 137,104 137,198 423,679 403,480 Depreciation and amortization 79,627 76,933 232,652 237,951 General taxes 23,374 22,999 70,998 71,872 Total operating expenses 240,105 237,130 727,329 713,303 Operating income 77,381 65,381 349,644 317,735 Other income (expense), net (2,761) 2,363 362 5,453 Interest expense, net (36,596) (35,373) (100,055) (106,349) Income before income taxes 38,024 32,371 249,951 216,839 Income taxes (6,801) (5,905) (43,247) (38,921) Net income $ 31,223 $ 26,466 $ 206,704 $ 177,918 Earnings per share Basic $ 0.50 $ 0.44 $ 3.28 $ 2.96 Diluted $ 0.49 $ 0.44 $ 3.27 $ 2.94 Average shares (thousands) Basic 63,030 60,183 62,967 60,125 Diluted 63,183 60,554 63,180 60,425 Dividends declared per share of stock $ 0.68 $ 0.67 $ 2.04 $ 2.01 -more-
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ONE Gas Announces Third Quarter and Year-to-Date 2026 Financial Results; November 2, 2026 Page 8 APPENDIX ONE Gas, Inc. CONSOLIDATED BALANCE SHEETS September 30, December 31, (Unaudited) 2026 2025 Assets (Thousands of dollars) Property, plant and equipment Property, plant and equipment $ 10,188,569 $ 9,734,150 Accumulated depreciation and amortization 2,718,810 2,611,952 Net property, plant and equipment 7,469,759 7,122,198 Current assets Cash and cash equivalents 7,269 10,620 Restricted cash and cash equivalents 11,734 23,107 Total cash, cash equivalents and restricted cash and cash equivalents 19,003 33,727 Accounts receivable, net 215,889 461,631 Materials and supplies 95,756 97,595 Income tax receivable — 55,552 Natural gas in storage 211,570 176,451 Regulatory assets 114,384 49,504 Prepaid expenses 25,484 34,224 Other current assets 11,549 7,200 Total current assets 693,635 915,884 Goodwill and other assets Regulatory assets 269,988 256,225 Securitized intangible asset, net 210,854 233,786 Goodwill 157,953 157,953 Pension and other postemployment benefits 51,474 47,012 Other assets 131,298 120,026 Total goodwill and other assets 821,567 815,002 Total assets $ 8,984,961 $ 8,853,084 APPENDIX -more-
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ONE Gas Announces Third Quarter and Year-to-Date 2026 Financial Results; November 2, 2026 Page 9 ONE Gas, Inc. CONSOLIDATED BALANCE SHEETS (Continued) September 30, December 31, (Unaudited) 2026 2025 Equity and Liabilities (Thousands of dollars) Equity and long-term debt Common stock, $0.01 par value: authorized 250,000,000 shares; issued and outstanding 62,856,769 sharesat September 30, 2026; issued and outstanding 62,692,392 shares at December 31, 2025$ 629 $ 627 Paid-in capital 2,543,213 2,530,137 Retained earnings 986,438 909,355 Accumulated other comprehensive income (loss) (539) 4 Total equity 3,529,741 3,440,123 Other long-term debt, excluding current maturities, net of issuance costs 2,504,497 2,133,018 Securitized utility tariff bonds, excluding current maturities, net of issuance costs 190,625 223,020 Total long-term debt, excluding current maturities, net of issuance costs 2,695,122 2,356,038 Total equity and long-term debt 6,224,863 5,796,161 Current liabilities Current maturities of other long-term debt, net of issuance costs 16 249,674 Current maturities of securitized utility tariff bonds, net of issuance costs 32,266 30,566 Notes payable 789,800 737,400 Accounts payable 126,645 222,102 Accrued taxes other than income 75,287 75,568 Regulatory liabilities 21,733 57,277 Customer deposits 60,203 52,871 Other current liabilities 89,957 106,400 Total current liabilities 1,195,907 1,531,858 Deferred credits and other liabilities Deferred income taxes 1,022,459 963,874 Regulatory liabilities 431,160 451,620 Other deferred credits 110,572 109,571 Total deferred credits and other liabilities 1,564,191 1,525,065 Commitments and contingencies Total liabilities and equity $ 8,984,961 $ 8,853,084 -more-
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ONE Gas Announces Third Quarter and Year-to-Date 2026 Financial Results; November 2, 2026 Page 10 APPENDIX ONE Gas, Inc. CONSOLIDATED STATEMENTS OF CASH FLOWS Nine Months EndedSeptember 30, (Unaudited) 2026 2025 (Thousands of dollars) Operating activities Net income $ 206,704 $ 177,918 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization 232,652 237,951 Deferred income taxes 39,297 30,742 Share-based compensation expense 11,846 11,305 Provision for doubtful accounts 9,169 5,843 Changes in assets and liabilities: Accounts receivable 236,573 192,432 Materials and supplies 1,839 (5,791) Income tax receivable 55,552 — Natural gas in storage (35,119) (36,861) Asset removal costs (44,426) (35,987) Accounts payable (95,293) (130,571) Accrued taxes other than income (281) (1,920) Customer deposits 7,332 419 Regulatory assets and liabilities - current (111,460) 55,334 Regulatory assets and liabilities - noncurrent (4,261) 23,620 Other assets and liabilities - current (10,976) 3,339 Other assets and liabilities - noncurrent 8,640 8,045 Cash provided by operating activities 507,788 535,818 Investing activities Capital expenditures (542,468) (539,433) Other investing expenditures (7,910) (8,053) Other investing receipts 7,732 3,629 Cash used in investing activities (542,646) (543,857) Financing activities Borrowings (repayments) of notes payable, net 52,400 (150,200) Issuance of other long-term debt, net of discounts and premiums 373,781 250,000 Long-term debt financing costs (3,356) (432) Issuance of common stock 3,895 3,561 Repayment of other long-term debt (250,010) (10) Repayment of securitized utility tariff bonds (31,133) (29,493) Dividends paid (128,098) (120,505) Tax withholdings related to net share settlements of stock compensation (4,186) (2,634) Construction advances 6,841 — Cash provided by (used in) financing activities 20,134 (49,713) Change in cash, cash equivalents, restricted cash and restricted cash equivalents (14,724) (57,752) 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$ 19,003 $ 20,785 Supplemental cash flow information: Cash paid for interest, net of amounts capitalized including AFUDC at September 30, 2026 and 2025 of$3.0 million and $4.6 million, respectively $ 97,430 $ 103,926 Cash paid (received) for state income taxes $ 1,150 $ (768) Cash paid (received) for federal income taxes $ (48,802)$ 7,763 -more-
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ONE Gas Announces Third Quarter and Year-to-Date 2026 Financial Results; November 2, 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 Nine Months Ended September 30, September 30, 2026 2025 2026 2025 (Thousands of dollars, except per share amounts) Net income - GAAP $ 31,223$ 26,466$ 206,704 $ 177,918 Other income - deferred carrying cost (a) 2,250 2,085 12,232 3,386 Income taxes (b) — — — — Adjusted net income - non-GAAP $ 33,473 $ 28,551 $ 218,936 $ 181,304 Earnings per share - GAAP Basic $ 0.50 $ 0.44 $ 3.28 $ 2.96 Diluted $ 0.49 $ 0.44 $ 3.27 $ 2.94 Adjusted net income per share - non-GAAP Basic $ 0.53 $ 0.47 $ 3.48 $ 3.02 Diluted $ 0.53 $ 0.47 $ 3.47 $ 3.00 Average shares (thousands) Basic 63,030 60,183 62,967 60,125 Diluted 63,183 60,554 63,180 60,425 (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 September 30, 2026, we placed $89.8 million of property, plant andequipment in service eligible for this treatment, compared with $116.9 million in the same period last year. For the nine months ended September 30,2026, we placed $215.1 million of property, plant and equipment in service eligible for this treatment, compared with $242.5 million in the sameperiod last year.(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 $ 297,500 $ 299,300 $ 301,100 Other income - deferred carrying cost (a) 15,500 15,700 15,900 Income taxes (b) — — — Adjusted net income - non-GAAP $ 313,000 $ 315,000 $ 317,000 Earnings per share - GAAP Basic $ 4.72 $ 4.75 $ 4.78 Diluted $ 4.70 $ 4.73 $ 4.76 Adjusted net income per share - non-GAAP Basic $ 4.97 $ 5.00 $ 5.03 Diluted $ 4.95 $ 4.98 $ 5.01 Average shares (thousands) Basic 62,995 62,995 62,995 Diluted 63,250 63,250 63,250 (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. -more-
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ONE Gas Announces Third Quarter and Year-to-Date 2026 Financial Results; November 2, 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 September 30, 2026, include $11.5 million associated with KGSS-I, which is offset by $8.2 million in operating and amortization expense and $3.2 million in interest expense, net. Compared to the same three month period last year, revenues increased $0.3 million, interest expense, net, decreased $0.4 million, and operating and amortization expense increased $0.6 million. Revenues for the nine months ended September 30, 2026, include $33.3 million associated with KGSS-I, which is offset by $23.3 million in operating and amortization expense and $10.0 million in interest expense, net. Compared to the same nine month period last year, revenues decreased $2.7 million, interest expense, net, decreased $1.2 million, and amortization and operating expense decreased $1.5 million. The following table summarizes the impact of KGSS-I on the consolidated balance sheets, for the periods indicated: September 30, December 31, 2026 2025 (Thousands of dollars) Restricted cash and cash equivalents $ 11,734 $ 23,107 Accounts receivable 4,266 4,463 Securitized intangible asset, net 210,854 233,786 Total assets $ 226,854 $ 261,356 Current maturities of securitized utility tariff bonds, net of issuance costs $ 32,266 $ 30,566 Accounts payable 186 136 Accrued interest 2,073 5,894 Securitized utility tariff bonds, excluding current maturities, net of discounts and issuance costs $3.8 millionand $4.3 million, as of September 30, 2026, and September 30, 2025, respectively 190,625 223,020 Paid-in capital 1,680 1,680 Retained earnings 24 60 Total liabilities and equity $ 226,854 $ 261,356 -more-
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ONE Gas Announces Third Quarter and Year-to-Date 2026 Financial Results; November 2, 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 Nine Months Ended September 30, September 30, 2026 2025 2026 2025 (Thousands of dollars) Operating revenues $ 11,479 $ 11,216 $ 33,332 $ 36,058 Operating expense (110) (110) (331) (331) Amortization expense (8,138) (7,490) (22,933) (24,476) Interest income 135 165 381 425 Interest expense (3,330) (3,745) (10,341) (11,568) Income before income taxes 36 36 108 108 Income taxes — — — — Net income $ 36 $ 36 $ 108 $ 108 -more-
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ONE Gas Announces Third Quarter and Year-to-Date 2026 Financial Results; November 2, 2026 Page 14 APPENDIX ONE Gas, Inc. INFORMATION AT A GLANCE Three Months Ended Nine Months Ended September 30, September 30, (Unaudited) 2026 2025 2026 2025 (Millions of dollars) Natural gas sales $ 338.4 $ 327.3 $ 1,466.1 $ 1,567.2 Transportation revenues 31.8 31.0 103.7 105.8 Securitization customer charges 11.4 11.2 33.3 36.0 Other revenues 9.8 9.6 31.6 29.1 Total revenues $ 391.4 $ 379.1 $ 1,634.7 $ 1,738.1 Cost of natural gas 73.8 76.6 557.7 707.0 Operating costs 160.5 160.2 494.7 475.4 Depreciation and amortization 79.7 76.9 232.7 238.0 Operating income $ 77.4 $ 65.4 $ 349.6 $ 317.7 Net income $ 31.2 $ 26.5 $ 206.7 $ 177.9 Capital expenditures and asset removal costs $ 229.0 $ 207.6 $ 586.9 $ 575.4 Volumes (Bcf) Natural gas sales Residential 7.3 7.7 61.7 79.2 Commercial and industrial 4.0 4.1 24.0 29.1 Other 0.4 0.5 1.8 2.2 Total sales volumes delivered 11.7 12.3 87.5 110.5 Transportation 47.6 46.1 157.4 160.1 Total volumes delivered 59.3 58.4 244.9 270.6 Average number of customers (in thousands) Residential 2,122 2,109 2,131 2,119 Commercial and industrial 159 161 161 163 Other 3 3 3 3 Transportation 11 11 11 11 Total customers 2,295 2,284 2,306 2,296 Heating Degree Days Actual degree days 1 14 4,552 6,074 Normal degree days 38 49 5,943 5,953 Percent colder (warmer) than normal weather (97)% (71)% (23)% 2 % Statistics by State Oklahoma Average number of customers (in thousands) 930 928 935 931 Actual degree days 0 0 1,537 2,080 Normal degree days 0 9 2,028 2,036 Percent colder (warmer) than normal weather — % (100)% (24)% 2 % Kansas Average number of customers (in thousands) 649 646 655 653 Actual degree days 1 14 2,305 2,943 Normal degree days 38 38 2,921 2,921 Percent colder (warmer) than normal weather (97)% (63)% (21)% 1 % Texas Average number of customers (in thousands) 716 710 716 712 Actual degree days 0 0 710 1,051 Normal degree days 0 2 994 996 Percent colder (warmer) than normal weather — % (100)% (29)% 6 % ###