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    SEC Form 10-Q filed by ONE Gas Inc.

    5/6/25 4:14:03 PM ET
    $OGS
    Oil/Gas Transmission
    Utilities
    Get the next $OGS alert in real time by email
    ogs-20250331
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    UNITED STATES
    SECURITIES AND EXCHANGE COMMISSION
    WASHINGTON, D.C. 20549


    FORM 10-Q

    ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
    For the quarterly period ended March 31, 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  001-36108

    ONE Gas, Inc.
    (Exact name of registrant as specified in its charter)
    Oklahoma46-3561936
    (State or other jurisdiction of
    incorporation or organization)
    (I.R.S. Employer Identification No.)
      
    15 East Fifth Street
    Tulsa,OK74103
    (Address of principal
    executive offices)
    (Zip Code)

    Registrant’s telephone number, including area code   (918) 947-7000

    Securities registered pursuant to Section 12(b) of the Act:
    Title of each classTrading SymbolName of exchange on which registered
    Common Stock, par value $0.01 per shareOGSNew 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 ☒ No ☐

    Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).  Yes ☒ No ☐

    Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.
    Large accelerated filer☒Accelerated filer☐
    Non-accelerated filer☐Smaller reporting company☐
    Emerging growth company☐

    If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

    Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes  ☐      No  ☒

    On April 28, 2025, the Company had 59,930,528 shares of common stock outstanding.

    1



























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    2


    ONE Gas, Inc.
    TABLE OF CONTENTS
    Part I.
    Financial Information
    Page No.
    Item 1.
    Consolidated Financial Statements (Unaudited)
    6
     
    Consolidated Statements of Income - Three Months Ended March 31, 2025 and 2024
    6
     
    Consolidated Statements of Comprehensive Income - Three Months Ended March 31, 2025 and 2024
    7
     
    Consolidated Balance Sheets - March 31, 2025 and December 31, 2024
    8
     
    Consolidated Statements of Cash Flows - Three Months Ended March 31, 2025 and 2024
    10
     
    Consolidated Statements of Equity - Three Months Ended March 31, 2025 and 2024
    11
     
    Notes to Consolidated Financial Statements
    12
    Item 2.
    Management’s Discussion and Analysis of Financial Condition and Results of Operations
    24
    Item 3.
    Quantitative and Qualitative Disclosures About Market Risk
    33
    Item 4.
    Controls and Procedures
    34
    Part II.
    Other Information
    34
    Item 1.
    Legal Proceedings
    34
    Item 1A.
    Risk Factors
    34
    Item 2.
    Unregistered Sales of Equity Securities and Use of Proceeds
    34
    Item 3.
    Defaults Upon Senior Securities
    34
    Item 4.
    Mine Safety Disclosures
    34
    Item 5.
    Other Information
    35
    Item 6.
    Exhibits
    35
    Signature
     
    37

    As used in this Quarterly Report, references to “we,” “our,” “us” or the “Company” refer to ONE Gas, Inc., an Oklahoma corporation, and its predecessors and subsidiaries, unless the context indicates otherwise.

    The statements in this Quarterly Report that are not historical information, including statements concerning plans and objectives of management for future operations, economic performance or related assumptions, are forward-looking statements. Forward-looking statements may include words such as “will,” “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. Although we believe that our expectations regarding future events are based on reasonable assumptions, we can give no assurance that such expectations and assumptions will be achieved. Important factors that could cause actual results to differ materially from those in the forward-looking statements are described under Part I, Item 2, Management’s Discussion and Analysis of Financial Condition and Results of Operations, “Forward-Looking Statements,” and Part II, Item 1A, “Risk Factors” in this Quarterly Report and under Part I, Item IA, “Risk Factors,” in our Annual Report.

    3


    AVAILABLE INFORMATION

    We make available, free of charge, on our website (www.onegas.com) our Annual Reports, Quarterly Reports, Current Reports on Form 8-K, amendments to those reports filed or furnished to the SEC pursuant to Section 13(a) or 15(d) of the Exchange Act and reports of holdings of our securities filed by our officers and directors under Section 16 of the Exchange Act. Such materials are available as soon as reasonably practicable after filing such material electronically or otherwise furnishing it to the SEC, which also makes these materials available on its website (www.sec.gov). Our Code of Business Conduct and Ethics, Corporate Governance Guidelines, Certificate of Incorporation, bylaws, the written charters of our Audit Committee, Executive Compensation Committee, and Corporate Governance Committee and our Sustainability Report are also available on our website, and copies of these documents are available upon request.

    In addition to filings with the SEC and materials posted on our website, we also use social media platforms as channels of information distribution to reach investors and other stakeholders. Information contained on our website and posted on or disseminated through our social media accounts is not incorporated by reference into this report.

    4

    Table of Contents
    GLOSSARY - The abbreviations, acronyms and industry terminology used in this Quarterly Report are defined as follows:
    AAOAccounting Authority Order
    ADITAccumulated deferred income taxes
    Annual ReportAnnual Report on Form 10-K for the year ended December 31, 2024
    ASCAccounting Standards Codification
    ASUAccounting Standards Update
    BcfBillion cubic feet
    CAAFederal Clean Air Act, as amended
    EDITExcess deferred income taxes resulting from a change in enacted tax rates
    EPSEarnings per share
    Exchange ActSecurities Exchange Act of 1934, as amended
    FASBFinancial Accounting Standards Board
    GAAPAccounting principles generally accepted in the United States of America
    GRIPGas Reliability Infrastructure Program
    GSRSGas System Reliability Surcharge
    HDDHeating degree day is a measure designed to reflect the demand for energy needed for heating based on the extent to which the daily average temperature falls below a reference temperature for which no heating is required, usually 65 degrees Fahrenheit
    ITInformation Technology
    KCCKansas Corporation Commission
    KDHEKansas Department of Health and Environment
    KGSS-IKansas Gas Service Securitization I, L.L.C.
    MGPManufactured gas plant
    MMcfMillion cubic feet
    Moody’sMoody’s Investors Service, Inc.
    NYSENew York Stock Exchange
    OCCOklahoma Corporation Commission
    ONE GasONE Gas, Inc.
    ONE Gas Credit AgreementONE Gas’ $1.35 billion revolving credit agreement, as amended
    PBRCPerformance-Based Rate Change
    PHMSAUnited States Department of Transportation Pipeline and Hazardous Materials Safety Administration
    PIPES ActProtecting Our Infrastructure of Pipelines and Enhancing Safety (PIPES) Act of 2020
    Quarterly Report(s)Quarterly Report(s) on Form 10-Q
    S&PStandard & Poor’s Ratings Services
    SECSecurities and Exchange Commission
    Securities ActSecurities Act of 1933, as amended
    Securitized Utility Tariff BondsSeries 2022-A Senior Secured Securitized Utility Tariff Bonds, Tranche A
    Senior NotesONE Gas’ registered unsecured notes consisting of $550 million of 5.10 percent senior notes due April 2029, $300 million of 2.00 percent senior notes due May 2030, $300 million of 4.25 percent senior notes due September 2032, $600 million of 4.658 percent senior notes due February 2044 and $400 million of 4.50 percent senior notes due November 2048
    TCEQTexas Commission on Environmental Quality
    WNAWeather normalization adjustment(s)
    XBRLeXtensible Business Reporting Language
    5

    Table of Contents
    PART I - FINANCIAL INFORMATION
    ITEM 1. CONSOLIDATED FINANCIAL STATEMENTS

    ONE Gas, Inc.  
    CONSOLIDATED STATEMENTS OF INCOMEThree Months Ended
    March 31,
    (Unaudited)20252024
    (Thousands of dollars, except per share amounts)
    Total revenues$935,190 $758,320 
    Cost of natural gas512,462 383,003 
    Operating expenses
    Operations and maintenance135,295 132,783 
    Depreciation and amortization81,704 76,572 
    General taxes25,230 20,102 
    Total operating expenses242,229 229,457 
    Operating income180,499 145,860 
    Other income, net
    518 3,508 
    Interest expense, net(35,697)(31,357)
    Income before income taxes145,320 118,011 
    Income taxes(25,901)(18,694)
    Net income
    $119,419 $99,317 
    Earnings per share
    Basic$1.99 $1.75 
    Diluted$1.98 $1.75 
    Average shares (thousands)
    Basic60,077 56,729 
    Diluted60,266 56,800 
    Dividends declared per share of stock$0.67 $0.66 
    See accompanying Notes to Consolidated Financial Statements.
    6

    Table of Contents
    ONE Gas, Inc.
    CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME 
    Three Months Ended
    March 31,
    (Unaudited)20252024
    (Thousands of dollars)
    Net income
    $119,419 $99,317 
    Other comprehensive income, net of tax
    Net unrealized holding gain (loss) on available-for-sale securities, net of tax of $(33) and $3, respectively
    124 (10)
    Total other comprehensive income (loss), net of tax124 (10)
    Comprehensive income$119,543 $99,307 
    See accompanying Notes to Consolidated Financial Statements.

    7

    Table of Contents
    ONE Gas, Inc.  
    CONSOLIDATED BALANCE SHEETS  
     March 31,December 31,
    (Unaudited)20252024
    Assets
    (Thousands of dollars)
    Property, plant and equipment  
    Property, plant and equipment$9,231,791 $9,124,134 
    Accumulated depreciation and amortization2,493,171 2,478,261 
    Net property, plant and equipment6,738,620 6,645,873 
    Current assets  
    Cash and cash equivalents19,305 57,995 
    Restricted cash and cash equivalents8,883 20,542 
    Total cash, cash equivalents and restricted cash and cash equivalents28,188 78,537 
    Accounts receivable, net446,807 408,448 
    Materials and supplies87,981 91,662 
    Income tax receivable53,624 53,624 
    Natural gas in storage68,686 161,184 
    Regulatory assets36,538 101,210 
    Other current assets34,414 35,216 
    Total current assets756,238 929,881 
    Goodwill and other assets  
    Regulatory assets268,581 278,006 
    Securitized intangible asset, net258,257 265,951 
    Goodwill157,953 157,953 
    Pension and other postemployment benefits44,366 42,882 
    Other assets103,225 105,025 
    Total goodwill and other assets832,382 849,817 
    Total assets$8,327,240 $8,425,571 
    See accompanying Notes to Consolidated Financial Statements.
    8

    Table of Contents
    ONE Gas, Inc.  
    CONSOLIDATED BALANCE SHEETS  
    (Continued)
     March 31,December 31,
    (Unaudited)20252024
    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 59,929,090 shares at March 31, 2025; issued and outstanding 59,876,861 shares at December 31, 2024
    $599 $599 
    Paid-in capital2,295,989 2,294,469 
    Retained earnings888,449 809,606 
    Accumulated other comprehensive loss(2)(126)
    Total equity3,185,035 3,104,548 
    Other long-term debt, excluding current maturities, net of issuance costs2,132,039 2,131,718 
    Securitized utility tariff bonds, excluding current maturities, net of issuance costs238,363 253,568 
    Total long-term debt, excluding current maturities, net of issuance costs2,370,402 2,385,286 
    Total equity and long-term debt5,555,437 5,489,834 
    Current liabilities  
    Current maturities of other long-term debt14 14 
    Current maturities of securitized utility tariff bonds29,750 28,956 
    Notes payable811,900 914,600 
    Accounts payable175,898 261,321 
    Accrued taxes other than income77,853 75,608 
    Regulatory liabilities39,665 22,525 
    Customer deposits54,923 56,243 
    Other current liabilities87,395 99,009 
    Total current liabilities1,277,398 1,458,276 
    Deferred credits and other liabilities  
    Deferred income taxes921,360 891,738 
    Regulatory liabilities457,126 467,563 
    Other deferred credits115,919 118,160 
    Total deferred credits and other liabilities1,494,405 1,477,461 
    Commitments and contingencies
    Total liabilities and equity$8,327,240 $8,425,571 
    See accompanying Notes to Consolidated Financial Statements.


    9

    Table of Contents
    ONE Gas, Inc.  
    CONSOLIDATED STATEMENTS OF CASH FLOWSThree Months Ended
    March 31,
    (Unaudited)20252024
     
    (Thousands of dollars)
    Operating activities  
    Net income$119,419 $99,317 
    Adjustments to reconcile net income to net cash provided by operating activities:
    Depreciation and amortization81,704 76,572 
    Deferred income taxes19,146 16,247 
    Share-based compensation expense3,656 3,117 
    Provision for doubtful accounts2,331 1,675 
    Changes in assets and liabilities:
    Accounts receivable(40,690)21,684 
    Materials and supplies3,681 (2,700)
    Natural gas in storage92,498 76,646 
    Asset removal costs(11,089)(12,621)
    Accounts payable(72,871)(68,117)
    Accrued taxes other than income2,245 (4,388)
    Customer deposits(1,320)(4,123)
    Regulatory assets and liabilities - current73,872 (58,520)
    Regulatory assets and liabilities - noncurrent9,425 2,520 
    Other assets and liabilities - current(11,650)(39,312)
    Other assets and liabilities - noncurrent7,102 265 
    Cash provided by operating activities
    277,459 108,262 
    Investing activities  
    Capital expenditures(166,597)(166,751)
    Other investing expenditures(2,427)(1,259)
    Other investing receipts1,179 2,029 
    Cash used in investing activities
    (167,845)(165,981)
    Financing activities  
    Borrowings (repayments) of notes payable, net
    (102,700)864,900 
    Repayment of other long-term debt(4)(773,000)
    Repayment of securitized utility tariff bonds(14,547)(13,780)
    Dividends paid(40,153)(37,336)
    Tax withholdings related to net share settlements of stock compensation(2,559)(980)
    Cash provided by (used in) financing activities
    (159,963)39,804 
    Change in cash, cash equivalents, restricted cash and restricted cash equivalents(50,349)(17,915)
    Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period78,537 39,387 
    Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period$28,188 $21,472 
    Supplemental cash flow information:
    Cash paid for interest, net of amounts capitalized
    $36,268 $41,497 
    Cash paid (received) for state income taxes$— $(2,797)
    Cash paid (received) for federal income taxes
    $— $— 
    See accompanying Notes to Consolidated Financial Statements.

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    ONE Gas, Inc. 
    CONSOLIDATED STATEMENTS OF EQUITY
    (Unaudited)Common Stock IssuedCommon StockPaid-in CapitalRetained EarningsAccumulated Other Comprehensive Income/(Loss)Total Equity
     (Shares)
    (Thousands of dollars)
    January 1, 202559,876,861 $599 $2,294,469 $809,606 $(126)$3,104,548 
    Net income— — — 119,419 — 119,419 
    Other comprehensive income— — — — 124 124 
    Common stock issued and other52,229 — 1,097 — — 1,097 
    Common stock dividends - $0.67 per share
    — — 423 (40,576)— (40,153)
    March 31, 202559,929,090 $599 $2,295,989 $888,449 $(2)$3,185,035 
    January 1, 202456,545,924 $565 $2,028,755 $737,739 $(1,182)$2,765,877 
    Net income— — — 99,317 — 99,317 
    Other comprehensive income— — — — (10)(10)
    Common stock issued and other23,472 1 2,136 — — 2,137 
    Common stock dividends - $0.66 per share
    — — 277 (37,613)— (37,336)
    March 31, 202456,569,396 $566 $2,031,168 $799,443 $(1,192)$2,829,985 
    See accompanying Notes to Consolidated Financial Statements.

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    ONE Gas, Inc.
    NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

    1.    SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    Basis of Presentation - Our accompanying unaudited consolidated financial statements have been prepared pursuant to the rules and regulations of the SEC. These statements also have been prepared in accordance with GAAP and reflect all adjustments that, in our opinion, are necessary for a fair statement of the results for the interim periods presented. All such adjustments are of a normal recurring nature. The 2024 year-end consolidated balance sheet data was derived from audited consolidated financial statements but does not include all disclosures required by GAAP. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and footnotes in our Annual Report. Our significant accounting policies are described in Note 1 of our Notes to Consolidated Financial Statements in our Annual Report. The preparation of these financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts and disclosures in the financial statements. Although management believes these estimates are reasonable, actual results could differ materially from these estimates. Due to the seasonal nature of our business, the results of operations for the three months ended March 31, 2025, are not necessarily indicative of the results that may be expected for a 12-month period.

    Organization and Nature of Operations - We provide natural gas distribution services to approximately 2.3 million customers in Oklahoma, Kansas and Texas through our three divisions, Oklahoma Natural Gas, Kansas Gas Service and Texas Gas Service, respectively. We primarily serve residential, commercial and transportation customers in all three states.

    Segments - We operate in one reportable business segment: regulated public utilities that deliver natural gas primarily to residential, commercial and transportation customers. Our accounting policies are the same as those described in Note 1 of the Notes to Consolidated Financial Statements in our Annual Report. We evaluate our financial performance principally on net income. For the three months ended March 31, 2025 and 2024, we had no single external customer from which we received 10 percent or more of our gross revenues.

    Property, Plant and Equipment and Asset Removal Costs - Accounts payable for construction work in progress and asset removal costs decreased by approximately $12.6 million and $13.4 million for the three months ended March 31, 2025 and 2024, respectively. Such amounts are not included in capital expenditures or asset removal costs in our consolidated statements of cash flows until paid.

    Accounts Receivable, Net - Accounts receivable represent valid claims against nonaffiliated customers for natural gas sold or services rendered. We assess the creditworthiness of our customers. Those customers who do not meet minimum standards may be required to provide security, including deposits and other forms of collateral, when appropriate and allowed by our tariffs. With approximately 2.3 million customers across three states, we are not exposed materially to a concentration of credit risk. We maintain an allowance for doubtful accounts based upon factors surrounding the credit risk of customers, historical trends, consideration of the current environment and other information. We recover natural gas costs related to accounts written off when they are deemed uncollectible through the purchased-gas cost adjustment mechanisms in each of our jurisdictions. At March 31, 2025 and December 31, 2024, our allowance for doubtful accounts was $16.7 million and $14.9 million, respectively.

    Recently Issued Accounting Standards Update - In November 2024, the FASB issued ASU-2024-03, “Disaggregation of Income Statement Expenses (Subtopic 220-40).” The amendments in this standard address requests from investors for more detailed information about the types of expenses commonly presented in income statements and will require a footnote disclosure to disaggregate, in a tabular presentation, each relevant expense category on the face of the income statement that includes any of the following natural expenses: purchases of inventory, employee compensation, depreciation, intangible asset amortization, and depreciation, depletion, and amortization recognized as part of oil- and gas-producing activities or other types of depletion expenses. The amendments in this update are effective for annual periods beginning after December 15, 2026, and interim periods within annual periods beginning after December 15, 2027. We are currently assessing the timing and impacts of adopting this standard.
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    2.    REVENUE

    The following table sets forth our revenues disaggregated by source for the periods indicated:

    Three Months Ended
    March 31,
    20252024
    (Thousands of dollars)
    Natural gas sales to customers$875,248 $689,505 
    Transportation revenues43,748 39,967 
    Securitization customer charges (Note 14)
    11,637 11,671 
    Miscellaneous revenues6,624 6,308 
    Total revenues from contracts with customers937,257 747,451 
    Other revenues - natural gas sales related(4,824)7,995 
    Other revenues 2,757 2,874 
    Total other revenues(2,067)10,869 
    Total revenues$935,190 $758,320 

    Accrued unbilled natural gas sales revenues at March 31, 2025 and December 31, 2024, were $119.4 million and $212.0 million, respectively, and are included in accounts receivable on our consolidated balance sheets.

    3.    REGULATORY ASSETS AND LIABILITIES

    The tables below present a summary of regulatory assets and liabilities, net of amortization, for the periods indicated:

    March 31, 2025
    CurrentNoncurrentTotal
    (Thousands of dollars)
    Winter weather event costs$— $979 $979 
    Under-recovered purchased-gas costs7,049 — 7,049 
    Pension and postemployment benefit costs, net1,358 224,860 226,218 
    Reacquired debt costs723 1,808 2,531 
    MGP remediation costs1,000 29,817 30,817 
    Ad-valorem tax7,086 — 7,086 
    WNA10,938 — 10,938 
    Customer credit deferrals— 11,052 11,052 
    Other, net8,384 65 8,449 
    Total regulatory assets36,538 268,581 305,119 
    Income tax rate changes— (457,126)(457,126)
    Over-recovered purchased-gas costs(39,665)— (39,665)
    Total regulatory liabilities(39,665)(457,126)(496,791)
    Net regulatory assets and liabilities$(3,127)$(188,545)$(191,672)

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    December 31, 2024
    CurrentNoncurrentTotal
    (Thousands of dollars)
    Winter weather event costs$9,051 $15,938 $24,989 
    Under-recovered purchased-gas costs43,819 — 43,819 
    Pension and postemployment benefit costs, net1,358 224,837 226,195 
    Reacquired debt costs723 1,989 2,712 
    MGP remediation costs1,000 30,067 31,067 
    Ad-valorem tax14,066 — 14,066 
    WNA26,684 — 26,684 
    Customer credit deferrals255 3,639 3,894 
    Other, net4,254 1,536 5,790 
    Total regulatory assets101,210 278,006 379,216 
    Income tax rate changes— (467,563)(467,563)
    Over-recovered purchased-gas costs(22,525)— (22,525)
    Total regulatory liabilities(22,525)(467,563)(490,088)
    Net regulatory assets and liabilities$78,685 $(189,557)$(110,872)

    Regulatory assets in our consolidated balance sheets, as authorized by various regulatory authorities, are probable of recovery. Base rates and certain riders are designed to provide a recovery of costs during the period such rates are in effect, but do not generally provide for a return on investment for amounts we have deferred as regulatory assets. All of our regulatory assets are subject to review by the respective regulatory authorities during future regulatory proceedings.

    Other regulatory assets and liabilities - Purchased-gas costs represent the natural gas costs that have been over- or under-recovered from customers through the purchased-gas cost adjustment mechanisms, and includes natural gas utilized in our operations and premiums paid and any cash settlements received from our purchased natural gas call options.

    The OCC, KCC and regulatory authorities in Texas have approved the recovery of pension costs and other postemployment benefits costs through rates for Oklahoma Natural Gas, Kansas Gas Service and Texas Gas Service, respectively. The costs recovered through rates are based on the net periodic benefit cost for defined benefit pension and other postemployment costs. Differences, if any, between the net periodic benefit cost (credit), net of deferrals, and the amount recovered through rates are reflected in earnings. We historically have recovered defined benefit pension and other postemployment benefit costs through rates. We believe it is probable that regulators will continue to include the net periodic pension and other postemployment benefit costs in our cost of service.

    We amortize reacquired debt costs in accordance with the accounting guidelines prescribed by the OCC and the KCC.

    See Note 12 for additional information regarding our regulatory assets for MGP remediation costs.

    Ad-valorem tax represents the difference in Kansas Gas Service’s taxes incurred each year above or below the amount approved in base rates. This difference is deferred as a regulatory asset or liability for a 12-month period. Kansas Gas Service then applies an adjustment to customers’ bills to refund the over-collected revenue or bill the under-collected revenue over the subsequent 12 months.

    Weather normalization represents revenue over- or under-recovered through the WNA rider in Kansas. This amount is deferred as a regulatory asset or liability for a 12-month period. Kansas Gas Service then applies an adjustment to customers’ bills for 12 months to refund the over-collected revenue or bill the under-collected revenue.

    The customer credit deferrals and the noncurrent regulatory liability for income tax rate changes represent deferral of the effects of enacted federal and state income tax rate changes on our ADIT and the effects of these changes on our rates. See Note 10 for additional information regarding the impact of income tax rate changes.

    Recovery through rates resulted in amortization of regulatory assets of approximately $6.0 million and $7.1 million for the three months ended March 31, 2025 and 2024, respectively.

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    4.    CREDIT FACILITY AND SHORT-TERM DEBT

    The ONE Gas Credit Agreement provides for a $1.35 billion revolving unsecured credit facility and includes a $20 million letter of credit subfacility and a $60 million swingline subfacility. We can request an increase in commitments of up to an additional $150 million upon satisfaction of customary conditions, including receipt of commitments from either new lenders or increased commitments from existing lenders. The ONE Gas Credit Agreement is available to provide liquidity for working capital, capital expenditures, acquisitions and mergers, the issuance of letters of credit and for other general corporate purposes.

    The ONE Gas Credit Agreement contains certain financial, operational and legal covenants. Among other things, these covenants include maintaining ONE Gas’ total debt-to-capital ratio of no more than 70 percent at the end of any calendar quarter. At March 31, 2025, our total debt-to-capital ratio was 50.2 percent and we were in compliance with all covenants under the ONE Gas Credit Agreement. Excluding the debt of KGSS-I, which is non-recourse to us, our total debt-to-capital ratio was 48.0 percent. We may reduce the unutilized portion of the ONE Gas Credit Agreement in whole or in part without premium or penalty. The ONE Gas Credit Agreement contains customary events of default. Upon the occurrence of certain events of default, our obligations under the ONE Gas Credit Agreement may be accelerated and the commitments may be terminated.

    At March 31, 2025, we had $1.35 million in letters of credit issued and no borrowings under the ONE Gas Credit Agreement, with approximately $1.349 billion of remaining credit, which is available to repay our commercial paper borrowings.

    Under our commercial paper program, we may issue unsecured commercial paper up to maximum amount of $1.35 billion to fund short-term borrowing needs. The maturities of the commercial paper vary but may not exceed 270 days from the date of issue. Commercial paper is generally sold at par less a discount representing an interest factor. At March 31, 2025 and December 31, 2024, we had $811.9 million and $914.6 million of commercial paper outstanding with a weighted-average interest rate of 4.69 percent and 4.77 percent, respectively.

    5.    LONG-TERM DEBT

    The table below presents a summary of our long-term debt outstanding for the periods indicated:

    March 31,December 31,
    Interest Rate
    20252024
    (Thousands of dollars)
    Senior Notes due:
    April 20295.100%$550,000 $550,000 
    May 20302.000%300,000 300,000 
    September 20324.250%300,000 300,000 
    February 20444.658%600,000 600,000 
    November 20484.500%400,000 400,000 
    Total Senior Notes2,150,000 2,150,000 
    KGSS-I Securitized Utility Tariff Bonds5.486%272,798 287,345 
    Unamortized discounts, net of premiums, on long-term debt(3,673)(3,624)
    Debt issuance costs (a)(20,181)(20,691)
    Other8.000%1,222 1,226 
    Total long-term debt, net2,400,166 2,414,256 
    Less: current maturities of KGSS-I securitized utility tariff bonds, net29,750 28,956 
    Less: current maturities of other long-term debt, net14 14 
    Noncurrent portion of long-term debt, net$2,370,402 $2,385,286 
    (a) Includes issuance costs and discounts for the KGSS-I Securitized Utility Tariff Bonds of $4.7 million and $4.8 million, at March 31, 2025 and December 31, 2024, respectively.

    Senior Notes - The indenture governing our Senior Notes includes an event of default upon the acceleration of other indebtedness of $100 million or more. Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of the outstanding Senior Notes to declare those Senior Notes immediately due and payable in full.

    Depending on the series, we may redeem our Senior Notes at par, plus accrued and unpaid interest to the redemption date, starting one month, three months or six months before their maturity dates. Prior to these dates, we may redeem these Senior Notes, in whole or in part, at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-
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    whole premium. The redemption price will never be less than 100 percent of the principal amount of the respective Senior Note plus accrued and unpaid interest to the redemption date. Senior Notes are senior unsecured obligations, ranking equally in right of payment with all of our existing and future unsecured senior indebtedness.

    Securitized Utility Tariff Bonds - The KGSS-I Securitized Utility Tariff Bonds are governed by an indenture between KGSS-I and the indenture trustee. The indenture contains certain covenants that restrict KGSS-I’s ability to sell, transfer, convey, exchange, or otherwise dispose of its assets. KGSS-I’s assets cannot be used to settle ONE Gas’ obligations and the holders of the Securitized Utility Tariff Bonds have no recourse against ONE Gas. See Note 14 for additional discussion of the Kansas securitization transaction.

    6.    EQUITY

    In February 2023, we entered into an at-the-market equity distribution agreement under which we may issue and sell shares of our common stock with an aggregate offering price up to $300 million. Sales of common stock are made by means of ordinary brokers’ transactions on the NYSE, in block transactions or as otherwise agreed to between us and the sales agent. We are under no obligation to offer and sell common stock under the program. At March 31, 2025, we had $225.5 million of equity available for issuance under the program.

    The following table summarizes all of our outstanding forward sale agreements at March 31, 2025:

    MaturityOriginal SharesRemaining SharesForward PriceNet Proceeds Available
    (Shares)(Shares)(Per share)(Thousands of dollars)
    December 31, 20251,200,000 223,000 $74.64 $16,645 
    December 31, 2025180,000 180,000 74.59 13,426 
    Total forward sale agreements1,380,000 403,000 $74.62 $30,071 

    Dividends Declared - In May 2025, we declared a dividend of $0.67 per share ($2.68 per share on an annualized basis) for shareholders of record as of May 19, 2025, payable on June 3, 2025.

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    7.    ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

    The following table sets forth the effect of reclassifications from accumulated other comprehensive income (loss) in our consolidated statements of income for the periods indicated:

    Three Months EndedAffected Line Item in the
    Details About Accumulated Other March 31,Consolidated Statements
    Comprehensive Income (Loss) Components20252024of Income
    (Thousands of dollars)
    Pension and other postemployment benefit plan obligations (a)
    Amortization of net gain (loss)$(1,834)$(1,442)
    Amortization of unrecognized prior service credit (cost)(93)(93)
    (1,927)(1,535)
    Regulatory adjustments (b)1,927 1,535 
    Amounts reclassified from accumulated other comprehensive income (loss)— — Other income (expense), net
    Available-for-sale securities
    Amounts reclassified from accumulated other comprehensive income (loss)3 1 Other income (expense), net
    Total available-for-sale securities3 1 
    Total reclassifications before tax3 1 Income before income taxes
    Tax effect of reclassifications(1)— Income tax expense
    Net reclassifications for the period$2 $1 Net income
    (a) These components of accumulated other comprehensive income (loss) are included in the computation of net periodic benefit cost. See Note 9 for additional detail of our net periodic benefit cost.
    (b) Regulatory adjustments represent pension and other postemployment benefit credits or costs expected to be recovered through rates and are deferred as part of our regulatory assets. See Note 3 for additional disclosures of regulatory assets and liabilities.

    8.    EARNINGS PER SHARE

    Basic EPS is calculated by dividing net income by the daily weighted-average number of common shares outstanding during the periods presented, which includes fully vested stock awards that have not yet been issued as common stock. Diluted EPS is based on shares outstanding for the calculation of basic EPS, plus unvested stock awards granted under our compensation plans and equity forward sale agreements, but only to the extent these instruments dilute earnings per share.

    The following tables set forth the computation of basic and diluted EPS from continuing operations for the periods indicated:

    Three Months Ended March 31, 2025
    IncomeSharesPer Share
    Amount
    (Thousands, except per share amounts)
    Basic EPS Calculation
    Net income available for common stock
    $119,419 60,077 $1.99 
    Diluted EPS Calculation
    Effect of dilutive securities— 189 
    Net income available for common stock and common stock equivalents$119,419 60,266 $1.98 
    Three Months Ended March 31, 2024
    IncomeSharesPer Share
    Amount
    (Thousands, except per share amounts)
    Basic EPS Calculation
    Net income available for common stock
    $99,317 56,729 $1.75 
    Diluted EPS Calculation
    Effect of dilutive securities— 71 
    Net income available for common stock and common stock equivalents$99,317 56,800 $1.75 

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    9.    EMPLOYEE BENEFIT PLANS

    The following tables set forth the components of net periodic benefit cost for our pension, inclusive of our defined benefit pension plan and supplemental executive retirement plan, and other postemployment benefit plans for the periods indicated:

    Pension Benefits
    Three Months Ended
    March 31,
    20252024
    (Thousands of dollars)
    Components of net periodic benefit cost (credit)
     
    Service cost$1,337 $1,551 
    Interest cost (a)
    10,042 10,281 
    Expected return on assets (a)
    (11,910)(14,757)
    Amortization of unrecognized prior service cost (a)
    93 93 
    Amortization of net loss (a)
    1,865 1,446 
    Net periodic benefit cost (credit)
    $1,427 $(1,386)
    (a) These amounts, net of any amounts capitalized as a regulatory asset, have been recognized as other (income) expense, net in the consolidated statement of income. See Note 11 for additional detail.

    Other Postemployment Benefits
    Three Months Ended
    March 31,
    20252024
    (Thousands of dollars)
    Components of net periodic benefit cost (credit)
    Service cost$123 $152 
    Interest cost (a)
    2,069 2,045 
    Expected return on assets (a)
    (2,212)(2,284)
    Amortization of unrecognized prior service cost (credit) (a)
    — — 
    Amortization of net (gain) (a)
    (31)(4)
    Net periodic benefit cost (credit)
    $(51)$(91)
    (a) These amounts, net of any amounts capitalized as a regulatory asset, have been recognized as other (income) expense, net in the consolidated statement of income. See Note 11 for additional detail.

    We recover qualified pension benefit plan and other postemployment benefit plan costs through rates charged to our customers. Certain regulatory authorities require that the recovery of these costs be based on specific guidelines. The difference between these regulatory-based amounts and the periodic benefit cost calculated pursuant to GAAP is deferred as a regulatory asset or liability and amortized to expense over periods in which this difference will be recovered in rates, as authorized by the applicable regulatory authorities. For the three months ended March 31, 2025 and 2024, regulatory deferrals related to net periodic benefit cost were $(0.3) million and $1.0 million, respectively.

    We capitalize all eligible service cost and non-service credit components under the accounting requirements of ASC Topic 980 (Regulated Operations) for rate-regulated entities. Capitalized non-service credits reflected as a regulatory liability in our consolidated balance sheets were $6.7 million at March 31, 2025 and December 31, 2024. See Note 3 of the Notes to Consolidated Financial Statements in this Quarterly Report for additional information.

    Nonqualified Deferred Compensation Plan - We have a nonqualified deferred compensation plan with obligations of $19.0 million and $18.9 million at March 31, 2025 and December 31, 2024, respectively, which are reported within other deferred credits in our consolidated balance sheets. These obligations represent the amount owed to plan participants and are treated as if invested in specified investment options. A significant portion of the obligation is indirectly funded with key-person corporate-owned life insurance policies to offset costs associated with our nonqualified deferred compensation plan and the supplemental executive retirement plan. These corporate-owned life insurance policies are measured at cash surrender value of $41.7 million and $41.5 million at March 31, 2025 and December 31, 2024, respectively, and are reported within other assets in our consolidated balance sheets.

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    Gains (losses) on the corporate-owned life insurance policies are recognized in other income (expense), net within our consolidated statements of income; see Note 11 for additional detail of our other income (expense), net. Deferred compensation expense (income) associated with the nonqualified deferred compensation plan is recognized in operations and maintenance expense within our consolidated statements of income and was $(0.3) million and $1.1 million for three months ended March 31, 2025 and 2024, respectively.

    10.    INCOME TAXES

    We use an estimated annual effective tax rate for purposes of determining the income tax provision during interim reporting periods. In calculating our estimated annual effective tax rate, we consider forecasted annual pre-tax income and estimated permanent book versus tax differences, as well as tax credits. Adjustments to the effective tax rate and estimates will occur as information and assumptions change.

    At March 31, 2025, we had no uncertain tax positions. Changes in tax laws or tax rates are recognized in the financial reporting period that includes the enactment date. We are no longer subject to income tax examination for years prior to 2020.

    Income tax expense reflects credits for the amortization of the regulatory liability associated with EDIT that were returned to customers of $8.1 million and $10.1 million for the three months ended March 31, 2025 and 2024, respectively.

    11.    OTHER INCOME AND OTHER EXPENSE

    The following table sets forth the components of other income and other expense for the periods indicated:

    Three Months Ended
    March 31,
    20252024
    (Thousands of dollars)
    Net periodic benefit credit other than service cost
    $332 $1,009 
    Earnings on investments associated with nonqualified deferred compensation plans
    147 2,176 
    Other income (expense), net39 323 
    Total other income, net
    $518 $3,508 

    12.    COMMITMENTS AND CONTINGENCIES

    Environmental Matters - We are subject to multiple laws and regulations regarding protection of the environment and natural and cultural resources, which affect many aspects of our present and future operations. Regulated activities include, but are not limited to, those involving air emissions, storm water and wastewater discharges, handling and disposal of solid and hazardous wastes, wetland preservation, plant and wildlife protection, hazardous materials use, storage and transportation, and pipeline and facility construction. These laws and regulations require us to obtain and/or comply with a wide variety of environmental clearances, registrations, licenses, permits and other approvals. Failure to comply with these laws, regulations, licenses and permits or the discovery of presently unknown environmental conditions may expose us to fines, penalties and/or interruptions in our operations that could be material to our results of operations. In addition, emission controls and/or other regulatory or permitting mandates under the CAA and other similar federal and state laws could require unexpected capital expenditures. We cannot assure that existing environmental statutes and regulations will not be revised or that new regulations will not be adopted or become applicable to us. Revised or additional statutes or regulations that result in increased compliance costs or additional operating restrictions could have a material adverse effect on our business, financial condition and results of operations. Our expenditures for environmental investigation and remediation compliance to-date have not been significant in relation to our financial position, results of operations or cash flows, and our expenditures related to environmental matters had no material effects on earnings or cash flows during the three months ended March 31, 2025 and 2024.

    We own or retain legal responsibility for certain environmental conditions at 12 former MGP sites in Kansas. These sites contain contaminants generally associated with MGP sites and are subject to control or remediation under various environmental laws and regulations. A consent agreement with the KDHE governs all environmental investigation and remediation work at these sites. The terms of the consent agreement require us to investigate these sites and set remediation activities based upon the results of the investigations and risk analysis. Remediation typically involves the management of contaminated soils and may involve removal of structures and monitoring and/or remediation of groundwater. We have completed or are addressing removal of the source of soil contamination at all 12 sites and continue to monitor groundwater at
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    seven of the 12 sites according to plans approved by the KDHE. Regulatory closure has been achieved at five of the 12 sites, but these sites remain subject to potential future requirements that may result in additional costs.

    We have an AAO that allows Kansas Gas Service to defer and seek recovery of costs necessary for investigation and remediation at, and nearby, these 12 former MGP sites that are incurred after January 1, 2017, up to a cap of $15.0 million, net of any related insurance recoveries. Costs approved for recovery in a future rate proceeding would then be amortized over a 15-year period. The unamortized amounts will not be included in rate base or accumulate carrying charges. Following a determination that future investigation and remediation work approved by the KDHE exceeds $15.0 million, net of any related insurance recoveries, Kansas Gas Service is required to file an application with the KCC for approval to increase the $15.0 million cap. During 2024, we received $1.7 million in insurance proceeds for remediation costs related to these sites. At March 31, 2025 and December 31, 2024, we have deferred $30.8 million and $31.1 million, respectively, for accrued investigation and remediation costs pursuant to our AAO. On January 3, 2025, Kansas Gas Service requested to increase the cap on the AAO from $15.0 million to $32 million. The original $15.0 million cap approved in 2017 was the result of a unanimous settlement agreement and contained additional reporting requirements and obligations. Kansas Gas Service's request to increase the cap leaves all of the other provisions of the 2017 settlement agreement in place.

    We also own or retain legal responsibility for certain environmental conditions at a former MGP site in Texas. At the request of the TCEQ, we began investigating the level and extent of contamination associated with the site under their Texas Risk Reduction Program. A preliminary site investigation revealed that this site contains contaminants generally associated with MGP sites and is subject to control or remediation under various environmental laws and regulations. At March 31, 2025, estimated costs associated with expected remediation activities for this site are not material.

    Our expenditures for environmental evaluation, mitigation, remediation and compliance to date have not been significant in relation to our financial position, results of operations or cash flows, and our expenditures related to environmental matters had no material effects on earnings or cash flows during the three months ended March 31, 2025 and 2024. The reserve for remediation of our MGP sites was $14.2 million and $14.3 million at March 31, 2025 and December 31, 2024, respectively.

    Environmental Footprint - We cannot assure that existing environmental statutes and regulations will not be revised or that new regulations will not be adopted or become applicable to us. Revised or additional regulations that result in increased compliance costs or additional operating restrictions could have a material adverse effect on our business, financial condition and results of operations. Our expenditures for environmental investigation, and remediation compliance to-date have not been significant in relation to our financial position, results of operations or cash flows, and our expenditures related to environmental matters had no material effects on earnings or cash flows for the three months ended March 31, 2025 and 2024.

    Pipeline Safety - We are subject to regulation under federal pipeline safety statutes and any analogous state regulations. These include safety requirements for the design, construction, operation, and maintenance of pipelines, including transmission and distribution pipelines. At the federal level, we are regulated by PHMSA. PHMSA regulations require the following for certain pipelines: inspection and maintenance plans; integrity management programs, including the determination of pipeline integrity risks and periodic assessments on certain pipeline segments; an operator qualification program, which includes certain trainings; a public awareness program that provides certain information; and a control room management plan.

    PHMSA promulgates various regulations related to pipeline safety. As part of the Consolidated Appropriations Act, 2021, the PIPES Act reauthorized PHMSA through 2023 and directed the agency to move forward with several regulatory actions, including the “Pipeline Safety: Class Location Change Requirements” and the “Pipeline Safety: Safety of Gas Transmission and Gathering Pipelines” proposed rulemakings. Congress has also instructed PHMSA to issue final regulations that will require operators of new and existing transmission and distribution pipeline facilities to conduct certain leak detection and repair programs and to require facility inspection and maintenance plans to align with those regulations. On January 20, 2025, an executive order began a regulatory freeze to all rulemakings that were not yet effective pending further review. To the extent such rulemakings impose more stringent requirements on our facilities, we may be required to incur expenditures that may be material.

    Regulatory - Several regulatory initiatives impacted the earnings and future earnings potential of our business. See additional information regarding our regulatory initiatives in the “Regulatory Activities” section of Management’s Discussion and Analysis of Financial Condition and Results of Operations.

    Legal Proceedings - We are a party to various litigation matters and claims that have arisen in the normal course of our operations. While the results of litigation and claims cannot be predicted with certainty, we believe the reasonably possible losses from such matters, individually and in the aggregate, are not material. Additionally, we believe the probable outcome of such matters will not have a material adverse effect on our results of operations, financial position or cash flows.
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    13.    DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS

    Accounting Treatment - We record all derivative instruments at fair value, with the exception of normal purchases and normal sales that are expected to result in physical delivery. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, if so, the reason for holding it, or if regulatory requirements impose a different accounting treatment.

    If certain conditions are met, we may elect to designate a derivative instrument as a hedge of exposure to changes in fair values or cash flows. We have not elected to designate any of our derivative instruments as hedges.

    The table below summarizes the various ways in which we account for our derivative instruments and the impact on our consolidated financial statements:
      Recognition and Measurement
    Accounting Treatment Balance Sheet Income Statement
    Normal purchases and
    normal sales
    -Fair value not recorded-Change in fair value not recognized in earnings
    Mark-to-market-Recorded at fair value-Change in fair value recognized in, and recoverable through, the purchased-gas cost adjustment mechanisms

    Fair Value Measurements - We define fair value as the price that would be received from the sale of an asset or the transfer of a liability in an orderly transaction between market participants at the measurement date. We use the market and income approaches to determine the fair value of our assets and liabilities and consider the markets in which the transactions are executed. We measure the fair value of a group of financial assets and liabilities consistent with how a market participant would price the net risk exposure at the measurement date.

    Fair Value Hierarchy - At each balance sheet date, we utilize a fair value hierarchy to classify fair value amounts recognized or disclosed in our consolidated financial statements based on the observability of inputs used to estimate such fair value. The levels of the hierarchy are described below:

    •Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities;
    •Level 2 - Significant observable pricing inputs other than quoted prices included within Level 1 that are, either directly or indirectly, observable as of the reporting date. Essentially, this represents inputs that are derived principally from or corroborated by observable market data; and
    •Level 3 - May include one or more unobservable inputs that are significant in establishing a fair value estimate. These unobservable inputs are developed based on the best information available and may include our own internal data.

    We recognize transfers into and out of the levels as of the end of each reporting period.

    Determining the appropriate classification of our fair value measurements within the fair value hierarchy requires management’s judgment regarding the degree to which market data is observable or corroborated by observable market data. We categorize derivatives for which fair value is determined using multiple inputs within a single level, based on the lowest level input that is significant to the fair value measurement in its entirety.

    Derivative Instruments - Our derivatives are comprised of over-the-counter natural gas fixed-price swaps and call options.

    Swaps - At March 31, 2025, we did not hold any swaps. At December 31, 2024, we held over-the counter natural gas fixed-prices swaps for the heating season ending March 2025 with a total notional amount of 6.20 Bcf.

    Options - At March 31, 2025, we did not hold any natural gas call options. At December 31, 2024, we held purchased natural gas call options for the heating season ending March 2025 with total notional amount of 0.60 Bcf, for which we paid premiums of $0.6 million.

    We have not designated any of our derivative instruments as accounting hedges. These contracts are included in, and recoverable through, our purchased-gas cost adjustment mechanisms. Additionally, premiums paid, changes in fair value and
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    any settlements received associated with these contracts are deferred as part of our unrecovered purchased-gas costs in our consolidated balance sheets. There were no transfers between levels for the periods presented.

    Other Financial Instruments - The approximate fair value of cash and cash equivalents, restricted cash and cash equivalents, accounts receivable and accounts payable is equal to book value, due to the short-term nature of these items. The fair value of our commercial paper was determined using quoted prices in an active market.

    The following tables summarize, by level within the fair value hierarchy, our derivative and other assets and liabilities that were accounted for at fair value on a recurring basis at March 31, 2025 and December 31, 2024:

    March 31, 2025
    Level 1Level 2Netting (c)Total
    (Thousands of dollars)
    Assets:
    United States treasury notes (b)$8,280 $— $— $8,280 
    Corporate bonds (b)— 14,997 — 14,997 
    Total assets$8,280 $14,997 $— $23,277 
    (a) The fair value is included in other current assets and other current liabilities in our consolidated balance sheets.
    (b) The fair value is included in other current and noncurrent assets in our consolidated balance sheets.
    (c) Our over-the-counter natural gas fixed-price swaps are presented on a net basis when the right of offset exists.

    December 31, 2024
    Level 1Level 2Netting (c)Total
    (Thousands of dollars)
    Assets:
    Derivative instruments - swaps (a)$— $25 $(25)$— 
    United States treasury notes (b)8,721 — — 8,721 
    Corporate bonds (b)— 13,171 — 13,171 
    Total assets$8,721 $13,196 $(25)$21,892 
    Liabilities:
    Derivative instruments - swaps (a)$— $3,238 $(25)$3,213 
    (a) The fair value is included in other current assets and other current liabilities in our consolidated balance sheets.
    (b) The fair value is included in other current and noncurrent assets in our consolidated balance sheets.
    (c) Our over-the-counter natural gas fixed-price swaps are presented on a net basis when the right of offset exists.

    The estimated fair value of our long-term debt, including current maturities, was $2.3 billion and $2.2 billion at March 31, 2025 and December 31, 2024, respectively. The estimated fair value of our long-term debt was determined using quoted market prices, and is classified as Level 2.

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    14.    VARIABLE INTEREST ENTITY

    KGSS-I is a special-purpose, wholly owned subsidiary of ONE Gas that was formed for the purpose of issuing securitized bonds to recover extraordinary costs incurred by Kansas Gas Service resulting from Winter Storm Uri. KGSS-I’s assets cannot be used to settle ONE Gas’ obligations and the holders of the Securitized Utility Tariff Bonds have no recourse against ONE Gas. The Securitized Utility Tariff Bonds have a scheduled final payment date of August 1, 2032. See Note 5 for additional information about the securitization financing.

    KGSS-I is considered to be a variable interest entity. As a result, KGSS-I is included in the consolidated financial statements of ONE Gas. No gain or loss was recognized upon initial consolidation.

    The following table summarizes the impact of KGSS-I on our consolidated balance sheets:

    March 31,December 31,
    20252024
    (Thousands of dollars)
    Restricted cash and cash equivalents$8,883 $20,542 
    Accounts receivable5,341 4,659 
    Income tax receivable6 — 
    Securitized intangible asset, net258,257 265,951 
    Total assets$272,487 $291,152 
    Current maturities of securitized utility tariff bonds$29,750 $28,956 
    Accounts payable169 319 
    Accrued interest2,494 6,568 
    Securitized utility tariff bonds, excluding current maturities, net of discounts and issuance costs $4.7 million and $4.8 million, as of March 31, 2025 and December 31, 2024, respectively
    238,363 253,568 
    Paid-in capital 1,680 1,681 
    Retained earnings31 60 
    Total liabilities and equity$272,487 $291,152 

    The following table summarizes the impact of KGSS-I on our consolidated statements of income:

    Three Months Ended
    March 31,
    20252024
    (Thousands of dollars)
    Operating revenues$11,637 $11,671 
    Operating expense(110)(111)
    Amortization expense(7,694)(7,385)
    Interest income148 188 
    Interest expense(3,944)(4,327)
    Income before income taxes37 36 
    Income taxes6 — 
    Net income$43 $36 

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    ITEM 2.    MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

    The following discussion and analysis should be read in conjunction with our unaudited consolidated financial statements and the Notes to Consolidated Financial Statements in in this Quarterly Report, as well as our Annual Report. Due to the seasonal nature of our business, the results of operations for the three months ended March 31, 2025, are not necessarily indicative of the results that may be expected for a 12-month period.

    RECENT DEVELOPMENTS

    Dividend - In May 2025, we declared a dividend of $0.67 per share ($2.68 per share on an annualized basis) for shareholders of record as of May 19, 2025, payable on June 3, 2025.

    REGULATORY ACTIVITIES

    Oklahoma - On February 27, 2025, Oklahoma Natural Gas filed its required PBRC application for the year ended December 2024. The filed request included a $41.5 million base rate revenue increase, $2.4 million energy efficiency incentive, and $13.2 million of estimated EDIT to be credited to customers in 2026. A hearing is scheduled for June 12, 2025.

    Kansas - In April 2025, Kansas Gas Service submitted an application to the KCC requesting an increase of approximately $7.2 million related to its GSRS. The KCC has until August 2025 to issue an order.

    Texas

    West-North Service Area - In February 2025, Texas Gas Service made a GRIP filing for all customers in the West-North service area, requesting a $8.2 million increase to be effective in June 2025.
    Central-Gulf Service Area - In February 2025, Texas Gas Service made a GRIP filing for all customers in the Central-Gulf service area, requesting a $15.4 million increase to be effective in June 2025.

    Rio Grande Valley Service Area - In April 2025, Texas Gas Service made a GRIP filing for all customers in the Rio Grande Valley service area, requesting a $3.2 million increase to be effective in September 2025.

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    FINANCIAL RESULTS AND OPERATING INFORMATION

    We operate in one reportable business segment: regulated public utilities that deliver natural gas to residential, commercial and transportation customers. Our accounting policies are the same as described in Note 1 of the Notes to Consolidated Financial Statements in our Annual Report. We evaluate our financial performance principally on net income.

    Selected Financial Results - For the three months ended March 31, 2025, net income was $119.4 million, or $1.98 per diluted share, compared with $99.3 million, or $1.75 per diluted share, in the same period last year.

    The following table sets forth certain selected financial results for our operations for the periods indicated:
     Three Months EndedThree Months Ended
     March 31,
    2025 vs. 2024
    Financial Results20252024Increase (Decrease)
     (Millions of dollars, except percentages)
    Natural gas sales$870.4 $694.1 $176.3 25 %
    Transportation revenues43.8 40.4 3.4 8 %
    Securitization customer charges11.6 11.7 (0.1)(1)%
    Other revenues9.4 12.1 (2.7)(22)%
    Total revenues935.2 758.3 176.9 23 %
    Cost of natural gas512.5 383.0 129.5 34 %
    Operating costs160.5 152.8 7.7 5 %
    Depreciation and amortization81.7 76.6 5.1 7 %
    Operating income$180.5 $145.9 $34.6 24 %
    Capital expenditures and asset removal costs$177.7 $179.4 $(1.7)(1)%

    Natural gas sales to customers represent revenue from contracts with customers through implied contracts established by our tariffs and rates approved by regulatory authorities, as well as revenues from regulatory mechanisms related to natural gas sales. Additionally, natural gas sales include recovery of the cost of natural gas.

    Our natural gas sales include fixed and variable charges related to the delivery of natural gas and gas costs that are passed through to our customers in accordance with our cost of natural gas regulatory mechanisms. Fixed charges reflect the portion of our natural gas sales attributable to the monthly fixed customer charge component of our rates, which does not fluctuate based on customer usage in each period. Variable charges reflect the portion of our natural gas sales that fluctuate with the volumes delivered and billed and the effects of weather normalization.

    Transportation revenues represent revenue from contracts with customers through implied contracts established by our tariffs and rates approved by regulatory authorities, as well as tariff-based negotiated contracts.

    Securitization customer charges represent revenue from contracts with customers through implied contracts established by the financing order approved by the KCC, related to the securitization of extraordinary costs incurred during Winter Storm Uri in the state of Kansas. See Note 14 of the Notes to Consolidated Financial Statements in this Quarterly Report for additional discussion of the securitization transaction in Kansas.

    Other revenues include primarily miscellaneous service charges, which represent implied contracts with customers established by our tariffs and rates approved by regulatory authorities and other revenues from regulatory mechanisms.

    Cost of natural gas includes commodity purchases, fuel, storage, transportation, hedging costs and settlement proceeds for natural gas price volatility mitigation programs approved by our regulators and other gas purchase costs recovered through our cost of natural gas regulatory mechanisms but does not include an allocation of general operating costs or depreciation and amortization. These regulatory mechanisms provide a method of recovering natural gas costs on an ongoing basis without a profit. Therefore, although our revenues will fluctuate with the cost of natural gas that we pass-through to our customers, operating income is not affected by fluctuations in the cost of natural gas.

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    Operating income increased $34.6 million for the three months ended March 31, 2025, compared with the same period last year, due primarily to the following:

    •an increase of $51.9 million in revenue from new rates; and
    •an increase of $2.3 million in residential sales due primarily to net customer growth in Oklahoma and Texas.

    These increases were offset partially by:

    •an increase of $5.1 million in depreciation and amortization expense from additional capital investment;
    •an increase of $4.7 million in ad valorem taxes;
    •an increase of $3.2 million in employee-related costs due, in part, to planned investments in the Company’s workforce; and
    •a net decrease of $6.5 million due to the impact of weather normalization mechanisms, which were largely offset by higher sales volumes.

    Weather across our service territories for the first quarter of 2025 was 16.3 percent colder than the prior year. The impact on operating income was tempered by our weather normalization mechanisms.

    Other Factors Affecting Net Income - Other factors that affected net income for the three months ended March 31, 2025, compared to the same period last year, include a decrease of $3.0 million in other income/(expense), net due primarily to a $2.0 million decrease in the gain on investments associated with our nonqualified employee benefit plans.

    Additionally, net income for the three months ended March 31, 2025, includes an increase in interest expense of $4.3 million, compared to the same period last year. The increase in interest expense is due primarily to the reopening of the outstanding 5.10 percent senior notes in August 2024 to issue an additional $250 million and higher average commercial paper balances.

    EDIT - Income tax expense reflects credits for the amortization of the regulatory liability associated with EDIT that were returned to customers of $8.1 million and $10.1 million for the three months ended March 31, 2025 and 2024, respectively.

    Capital Expenditures and Asset Removal Costs - Our capital expenditures program includes expenditures for pipeline integrity, extending service to new areas, reinforcing and increasing system capabilities, pipeline replacements, automated meter reading, government-mandated pipeline relocations, fleet, facilities, IT assets, and cybersecurity. It is our practice to maintain and upgrade our infrastructure, facilities and systems to ensure safe, reliable, and efficient operations. Asset removal costs include expenditures associated with the replacement or retirement of long-lived assets that result from the construction, development and/or normal use of our assets, primarily our pipeline assets.

    Capital expenditures and asset removal costs were $1.7 million lower for the three months ended March 31, 2025, compared with the same period last year. Our full-year capital expenditures and asset removal costs are expected to be approximately $750 million for 2025.

    Selected Operating Information - The following tables set forth certain selected operating information for the periods indicated:

    Three Months EndedVariances
    March 31,
    2025 vs. 2024
    (in thousands)20252024Increase (Decrease)
    Average Number of CustomersOKKSTXTotalOKKSTXTotalOKKSTXTotal
    Residential851 602 672 2,125 845 599 666 2,110 6 3 6 15 
    Commercial and industrial78 51 36 165 78 51 36 165 — — — — 
    Other— — 3 3 — — 3 3 — — — — 
    Transportation5 6 1 12 5 6 1 12 — — — — 
    Total customers934 659 712 2,305 928 656 706 2,290 6 3 6 15 

    The increase in the average number of customers for the periods presented is due primarily to the connection of new customers resulting from the extension and expansion of our system in our service areas. For the three months ended March 31, 2025, our average customer count includes approximately 5,600 new customer connections during the period. For the year ended December 31, 2024, our average customer count included approximately 23,000 new customer connections.

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    The following table reflects total volumes delivered, excluding the effects of WNA mechanisms on sales volumes:

    Three Months Ended
     March 31,
    Volumes (MMcf)
    20252024
    Natural gas sales  
    Residential58,921 52,353 
    Commercial and industrial19,226 17,045 
    Other1,137 1,056 
    Total sales volumes delivered79,284 70,454 
    Transportation65,342 63,399 
    Total volumes delivered144,626 133,853 

    The impact of weather on residential and commercial natural gas sales is tempered by WNA mechanisms in all jurisdictions.

    The following table sets forth the HDDs by state for the periods indicated:

    Three Months Ended
    March 31,
    20252024
    2025 vs. 2024
    20252024
    HDDsActualNormalActualNormalActual VarianceActual as a percent of Normal
    Oklahoma1,916 1,797 1,681 1,800 14 %107 %93 %
    Kansas2,610 2,486 2,201 2,460 19 %105 %89 %
    Texas987 948 859 959 15 %104 %90 %

    Normal HDDs are established through rate proceedings in each of our jurisdictions for use primarily in weather normalization billing calculations. See further discussion on weather normalization in our Regulatory Overview section in Part 1, Item 1, “Business,” of our Annual Report. Normal HDDs disclosed above are based on:

    •Oklahoma - A 10-year weighted average as of June 30, 2021, as calculated using 11 weather stations across Oklahoma and weighted on average customer count.
    •Kansas - A 30-year rolling average for years 1994-2023 calculated using three weather stations across Kansas and weighted on HDDs by weather station and customers.
    •Texas - An average of HDDs authorized in our most recent rate proceeding in each jurisdiction and weighted using a rolling 10-year average of actual natural gas distribution sales volumes by service area.

    Actual HDDs are based on the quarter-to-date weighted average of:

    •11 weather stations and customers by month for Oklahoma;
    •3 weather stations and customers by month for Kansas; and
    •9 weather stations and natural gas distribution sales volumes by service area for Texas.

    CONTINGENCIES

    We are a party to various litigation matters and claims that have arisen in the normal course of our operations. While the results of litigation and claims cannot be predicted with certainty, we believe the reasonably possible losses from such matters, individually and in the aggregate, are not material. Additionally, we believe the probable outcome of such matters will not have a material adverse effect on our results of operations, financial position or cash flows.

    LIQUIDITY AND CAPITAL RESOURCES

    General - We have relied primarily on operating cash flow and commercial paper for our liquidity and capital resource requirements. We fund operating expenses, working capital requirements, including purchases of natural gas, and capital expenditures primarily with cash from operations and commercial paper.

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    Our stable cash flow and earnings profile is due to the significant residential component of our customer base, the fixed-charge component of our natural gas sales revenues and the rate mechanisms that we have in place. Additionally, we have rate mechanisms in place in our jurisdictions that reduce the lag in earning a return on our capital expenditures and provide for recovery of certain changes in our cost of service by allowing for adjustments to rates between rate cases. We anticipate that our cash flow generated from operations and our expected short- and long-term financing arrangements will enable us to maintain our current and planned level of operations and provide us flexibility to finance our infrastructure investments. Our ability to access capital markets for debt and equity financing under reasonable terms depends on market conditions, our financial condition and credit ratings.

    Short-term Debt - The ONE Gas Credit Agreement contains certain financial, operational and legal covenants. Among other things, these covenants include maintaining ONE Gas’ total debt-to-capital ratio of no more than 70 percent at the end of any calendar quarter. At March 31, 2025, our total debt-to-capital ratio was 50.2 percent and we were in compliance with all covenants under the ONE Gas Credit Agreement. Excluding the debt of KGSS-I, which is non-recourse to us, our total debt-to-capital ratio was 48.0 percent. We may reduce the unutilized portion of the ONE Gas Credit Agreement in whole or in part without premium or penalty. The ONE Gas Credit Agreement contains customary events of default. Upon the occurrence of certain events of default, the obligations under the ONE Gas Credit Agreement may be accelerated and the commitments may be terminated.

    At March 31, 2025, we had $1.35 million in letters of credit issued and no borrowings under the ONE Gas Credit Agreement, with approximately $1.349 billion of remaining credit, which is available to repay our commercial paper borrowings.

    The ONE Gas Credit Agreement provides for a $1.35 billion revolving unsecured credit facility and includes a $20 million letter of credit subfacility and a $60 million swingline subfacility. We can request an increase in commitments of up to an additional $150 million upon satisfaction of customary conditions, including receipt of commitments from either new lenders or increased commitments from existing lenders. The ONE Gas Credit Agreement is available to provide liquidity for working capital, capital expenditures, acquisitions and mergers, the issuance of letters of credit, and for other general corporate purposes.

    Under our commercial paper program, we may issue unsecured commercial paper up to maximum amount of $1.35 billion to fund short-term borrowing needs. The maturities of the commercial paper vary but may not exceed 270 days from the date of issue. Commercial paper is generally sold at par less a discount representing an interest factor. At March 31, 2025 and December 31, 2024, we had $811.9 million and $914.6 million of commercial paper outstanding with a weighted-average interest rate of 4.69 percent and 4.77 percent, respectively.

    Senior Notes - At March 31, 2025, our long-term debt-to-capital ratio was 43.0 percent. Excluding the debt of KGSS-I, which is non-recourse to us, our long-term debt-to-capital ratio was 40.1 percent. See Note 14 of the Notes to Consolidated Financial Statements in this Quarterly Report for information with respect to KGSS-I.

    At March 31, 2025, we had outstanding $2.2 billion of Senior Notes with none due within the next year. The indenture governing our Senior Notes includes an event of default upon the acceleration of other indebtedness of $100 million or more. Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of the outstanding Senior Notes to declare those Senior Notes immediately due and payable in full.

    Depending on the series, we may redeem our Senior Notes at par, plus accrued and unpaid interest to the redemption date, starting one month, three months or six months before their maturity dates. Prior to these dates, we may redeem these Senior Notes, in whole or in part, at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium. The redemption price will never be less than 100 percent of the principal amount of the respective Senior Note plus accrued and unpaid interest to the redemption date. Our Senior Notes are senior unsecured obligations, ranking equally in right of payment with all of our existing and future unsecured senior indebtedness.

    Credit Ratings - Our credit ratings at March 31, 2025, were:

    Rating AgencyLong-term RatingShort-term RatingOutlook
    Moody’sA3Prime-2Stable
    S&PA-A-2Stable

    We intend to maintain credit metrics at a level that supports our balanced approach to capital investment and a return of capital to shareholders via a dividend that we believe will be competitive with our peer group.

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    Securitized Utility Tariff Bonds - At March 31, 2025, we had outstanding $272.8 million of 5.486 percent KGSS-I Securitized Utility Tariff Bonds with $29.8 million due within the next year. The bonds are governed by an indenture between KGSS-I and the indenture trustee. The indenture contains certain covenants that restrict KGSS-I’s ability to sell, transfer, convey, exchange, or otherwise dispose of its assets.
    Equity Issuances - In February 2023, we entered into an at-the-market equity distribution agreement under which we may issue and sell shares of our common stock with an aggregate offering price up to $300 million. Sales of common stock are made by means of ordinary brokers’ transactions on the NYSE, in block transactions or as otherwise agreed to between us and the sales agent. We are under no obligation to offer and sell common stock under the program. At March 31, 2025, we had $225.5 million of equity available for issuance under the program.

    Pension and Other Postemployment Benefit Plans - In 2025, our contributions are expected to be approximately $9.8 million to our defined benefit pension plans, and no contributions are expected to be made to our other postemployment benefit plans. We use a December 31 measurement date for our plans.

    Information about our pension and other postemployment benefit plans, including anticipated contributions, is included under Note 11 of the Notes to Consolidated Financial Statements in our Annual Report. See Note 9 of the Notes to Consolidated Financial Statements in this Quarterly Report for additional information.

    CASH FLOW ANALYSIS

    We use the indirect method to prepare our consolidated statements of cash flows. Under this method, we reconcile net income to cash flows provided by operating activities by adjusting net income for those items that impact net income but may not result in actual cash receipts or payments and changes in our assets and liabilities not classified as investing or financing activities during the period. Items that impact net income but may not result in actual cash receipts or payments include, but are not limited to, depreciation and amortization, deferred income taxes, share-based compensation expense and provision for doubtful accounts.

    The following table sets forth the changes in cash flows by operating, investing and financing activities for the periods indicated:

    Three Months Ended
     March 31,Variance
    20252024
    2025 vs. 2024
     
    (Millions of dollars)
    Total cash provided by (used in):
    Operating activities$277.5 $108.3 $169.2 
    Investing activities(167.8)(166.0)(1.8)
    Financing activities(160.0)39.8 (199.8)
    Change in cash, cash equivalents, restricted cash and restricted cash equivalents(50.3)(17.9)(32.4)
    Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period78.5 39.4 39.1 
    Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period$28.2 $21.5 $6.7 

    Operating Cash Flows - Changes in cash flows from operating activities are due primarily to changes in sales revenues, natural gas costs and operating expenses discussed in “Financial Results and Operating Information,” and changes in working capital. Changes in natural gas prices and demand for our services or natural gas, whether because of general economic conditions, variations in weather not mitigated by WNA mechanisms, changes in supply or increased competition from other service providers, could affect our earnings and operating cash flows. Typically, our cash flows from operations are greater in the first half of the year compared with the second half of the year.

    Operating cash flows were higher for the three months ended March 31, 2025, compared with the prior period, due primarily to working capital changes related to the recovery of regulatory assets.

    Investing Cash Flows - Cash used in investing activities increased for the three months ended March 31, 2025, compared with the prior period, due primarily to an increase in capital expenditures for system integrity and extension of service to new areas.

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    Financing Cash Flows - Cash used in financing activities increased for the three months ended March 31, 2025, compared with the prior period, due primarily to the repayment of commercial paper.

    ENVIRONMENTAL, SAFETY AND REGULATORY MATTERS

    Environmental Matters - We are subject to multiple laws and regulations regarding protection of the environment and natural and cultural resources, which affect many aspects of our present and future operations. Regulated activities include, but are not limited to, those involving air emissions, storm water and wastewater discharges, handling and disposal of solid and hazardous wastes, wetland preservation, plant and wildlife protection, hazardous materials use, storage and transportation, and pipeline and facility construction. These laws and regulations require us to obtain and/or comply with a wide variety of environmental clearances, registrations, licenses, permits and other approvals. Failure to comply with these laws, regulations, licenses and permits or the discovery of presently unknown environmental conditions may expose us to fines, penalties and/or interruptions in our operations that could be material to our results of operations. In addition, emission controls and/or other regulatory or permitting mandates under the CAA and other similar federal and state laws could require unexpected capital expenditures. We cannot assure that existing environmental statutes and regulations will not be revised or that new regulations will not be adopted or become applicable to us. Revised or additional statutes or regulations that result in increased compliance costs or additional operating restrictions could have a material adverse effect on our business, financial condition and results of operations. Our expenditures for environmental investigation and remediation compliance to-date have not been significant in relation to our financial position, results of operations or cash flows, and our expenditures related to environmental matters had no material effects on earnings or cash flows during the three months ended March 31, 2025 and 2024.

    We own or retain legal responsibility for certain environmental conditions at 12 former MGP sites in Kansas. These sites contain contaminants generally associated with MGP sites and are subject to control or remediation under various environmental laws and regulations. A consent agreement with the KDHE governs all environmental investigation and remediation work at these sites. The terms of the consent agreement require us to investigate these sites and set remediation activities based upon the results of the investigations and risk analysis. Remediation typically involves the management of contaminated soils and may involve removal of structures and monitoring and/or remediation of groundwater. We have completed or are addressing removal of the source of soil contamination at all 12 sites and continue to monitor groundwater at seven of the 12 sites according to plans approved by the KDHE. Regulatory closure has been achieved at five of the 12 sites, but these sites remain subject to potential future requirements that may result in additional costs.

    We have an AAO that allows Kansas Gas Service to defer and seek recovery of costs necessary for investigation and remediation at, and nearby, these 12 former MGP sites that are incurred after January 1, 2017, up to a cap of $15.0 million, net of any related insurance recoveries. Costs approved for recovery in a future rate proceeding would then be amortized over a 15-year period. The unamortized amounts will not be included in rate base or accumulate carrying charges. Following a determination that future investigation and remediation work approved by the KDHE exceeds $15.0 million, net of any related insurance recoveries, Kansas Gas Service is required to file an application with the KCC for approval to increase the $15.0 million cap. During 2024, we received $1.7 million in insurance proceeds for remediation costs related to these sites. At March 31, 2025 and December 31, 2024, we have deferred $30.8 million and $31.1 million, respectively, for accrued investigation and remediation costs pursuant to our AAO. On January 3, 2025, Kansas Gas Service requested to increase the cap on the AAO from $15.0 million to $32 million. The original $15.0 million cap approved in 2017 was the result of a unanimous settlement agreement and contained additional reporting requirements and obligations. Kansas Gas Service's request to increase the cap leaves all of the other provisions of the 2017 settlement agreement in place.

    We also own or retain legal responsibility for certain environmental conditions at a former MGP site in Texas. At the request of the TCEQ, we began investigating the level and extent of contamination associated with the site under their Texas Risk Reduction Program. A preliminary site investigation revealed that this site contains contaminants generally associated with MGP sites and is subject to control or remediation under various environmental laws and regulations. At March 31, 2025, estimated costs associated with expected remediation activities for this site are not material.

    Our expenditures for environmental evaluation, mitigation, remediation and compliance to date have not been significant in relation to our financial position, results of operations or cash flows, and our expenditures related to environmental matters had no material effects on earnings or cash flows during the three months ended March 31, 2025 and 2024. The reserve for remediation of our MGP sites was $14.2 million and $14.3 million at March 31, 2025 and December 31, 2024, respectively.

    Environmental Footprint - We cannot assure that existing environmental statutes and regulations will not be revised or that new regulations will not be adopted or become applicable to us. Revised or additional regulations that result in increased compliance costs or additional operating restrictions could have a material adverse effect on our business, financial condition and results of operations. Our expenditures for environmental investigation, and remediation compliance to-date have not been
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    significant in relation to our financial position, results of operations or cash flows, and our expenditures related to environmental matters had no material effects on earnings or cash flows for the three months ended March 31, 2025 and 2024.

    Pipeline Safety - We are subject to regulation under federal pipeline safety statutes and any analogous state regulations. These include safety requirements for the design, construction, operation, and maintenance of pipelines, including transmission and distribution pipelines. At the federal level, we are regulated by PHMSA. PHMSA regulations require the following for certain pipelines: inspection and maintenance plans; integrity management programs, including the determination of pipeline integrity risks and periodic assessments on certain pipeline segments; an operator qualification program, which includes certain trainings; a public awareness program that provides certain information; and a control room management plan.

    PHMSA promulgates various regulations related to pipeline safety. As part of the Consolidated Appropriations Act, 2021, the PIPES Act reauthorized PHMSA through 2023 and directed the agency to move forward with several regulatory actions, including the “Pipeline Safety: Class Location Change Requirements” and the “Pipeline Safety: Safety of Gas Transmission and Gathering Pipelines” proposed rulemakings. Congress has also instructed PHMSA to issue final regulations that will require operators of non-rural gas gathering lines and new and existing transmission and distribution pipeline facilities to conduct certain leak detection and repair programs and to require facility inspection and maintenance plans to align with those regulations. On January 20, 2025, an executive order began a regulatory freeze to all rulemakings that were not yet effective pending further review. To the extent such rulemakings impose more stringent requirements on our facilities, we may be required to incur expenditures that may be material.

    Regulatory - Several regulatory initiatives impacted the earnings and future earnings potential of our business. See additional information regarding our regulatory initiatives in the “Regulatory Activities” section of Management’s Discussion and Analysis of Financial Condition and Results of Operations.

    IMPACT OF NEW ACCOUNTING STANDARDS

    Information about the impact of new accounting standards, if any, is included in Note 1 of the Notes to Consolidated Financial Statements in this Quarterly Report.

    CRITICAL ACCOUNTING ESTIMATES

    The preparation of our consolidated financial statements and related disclosures in accordance with GAAP requires us to make estimates and assumptions with respect to values or conditions that cannot be known with certainty that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements. These estimates and assumptions also affect the reported amounts of revenues and expenses during the reporting period. Although we believe these estimates and assumptions are reasonable, actual results could differ from our estimates.

    Information about our estimates and critical accounting policies is included under Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations, “Critical Estimates and Accounting Policies,” in our Annual Report.

    FORWARD-LOOKING STATEMENTS

    Some of the statements contained and incorporated in this Quarterly Report 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 and other statements in this Quarterly Report regarding our environmental, social and other sustainability plans and goals are not an indication that these statements are necessarily material to investors or required to be disclosed in our filings with the SEC. In addition, historical, current, and forward-looking environmental, social and sustainability-related statements may be based on standards for measuring progress that are still developing, internal controls and processes that continue to evolve, and assumptions that are subject to change in the future.

    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 Quarterly Report identified by words such as “anticipate,” “estimate,” “expect,” “project,” “intend,” “plan,” “believe,” “should,” “goal,” “forecast,”
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    “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 Quarterly Report. 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, 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 IT 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, and climate change, and the related effects on supply, demand, and costs;
    •indebtedness, which 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 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;
    •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 natural gas purchased for our customers and any related financing required to support our purchase of natural gas supply;
    •impact of potential impairment charges;
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    •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 any 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.

    ITEM 3.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

    Our quantitative and qualitative disclosures about market risk are consistent with those discussed in Part II, Item 7A, Quantitative and Qualitative Disclosures About Market Risk, in our Annual Report.

    Commodity Price Risk

    Our commodity price risk, driven primarily by fluctuations in the price of natural gas, is mitigated by our purchased-gas cost adjustment mechanisms through which we pass-through natural gas costs to our customers without profit. We may use fixed-price natural gas contracts or derivative instruments to hedge the cost of a portion of our anticipated natural gas purchases during the winter heating months to reduce the impact on our customers of upward market price volatility of natural gas. Additionally, we inject natural gas into storage during the warmer months, when natural gas prices are typically lower, and withdraw the natural gas during the colder months of the year. Gains or losses associated with these derivative instruments and the costs of our fixed-price natural gas contracts and storage activities are included in, and recoverable through our purchased-gas cost adjustment mechanisms, which are subject to review by regulatory authorities.

    Interest-Rate Risk

    We are exposed to interest-rate risk primarily associated with commercial paper borrowings, borrowings under our credit agreement, and new debt financing needed to fund capital requirements, including future contractual obligations and maturities
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    of long-term and short-term debt. We may manage interest-rate risk on future borrowings through the use of fixed-rate debt, floating-rate debt and, at times, interest-rate swaps. Fixed-rate swaps may be used to reduce our risk of increased interest costs during periods of rising interest rates. Floating-rate swaps may be used to convert the fixed rates of long-term borrowings into short-term variable rates.

    Counterparty Credit Risk

    We assess the creditworthiness of our customers. Those customers who do not meet minimum standards are required to provide security, including deposits or other forms of collateral, when appropriate and allowed by tariff. With approximately 2.3 million customers across three states, we are not exposed materially to a concentration of credit risk. We maintain a provision for doubtful accounts based upon factors surrounding the credit risk of customers, historical trends, consideration of the current credit environment and other information. We recover the fuel-related portion of bad debts through our purchased-gas cost adjustment mechanisms.

    ITEM 4.CONTROLS AND PROCEDURES

    Quarterly Evaluation of Disclosure Controls and Procedures - Our Chief Executive Officer (Principal Executive Officer) and Chief Financial Officer (Principal Financial Officer) have concluded that our disclosure controls and procedures were effective as of the end of the period covered by this report based on the evaluation of the controls and procedures required by Rules 13(a)-15(b) of the Exchange Act.

    Changes in Internal Control Over Financial Reporting - There have been no changes in our internal control over financial reporting during the quarter ended March 31, 2025, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

    PART II - OTHER INFORMATION

    ITEM 1.    LEGAL PROCEEDINGS

    We are a party to various litigation matters and claims that have arisen in the normal course of our operations. While the results of litigation and claims cannot be predicted with certainty, we believe the reasonably possible losses from such matters, individually and in the aggregate, are not material. Additionally, we believe the probable final outcome of such matters will not have a material adverse effect on our results of operations, financial position or cash flows.

    ITEM 1A.    RISK FACTORS

    Our investors should consider the risks set forth in Part I, Item 1A, Risk Factors, of our Annual Report that could affect us and our business. Although we have tried to discuss key factors, our investors need to be aware that other risks may prove to be important in the future. New risks may emerge at any time, and we cannot predict such risks or estimate the extent to which they may affect our financial performance. Investors should carefully consider the discussion of risks and the other information included or incorporated by reference in this Quarterly Report, including “Forward-Looking Statements,” which are included in Part I, Item 2, Management’s Discussion and Analysis of Financial Condition and Results of Operations.

    ITEM 2.UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

    Not applicable.

    ITEM 3.    DEFAULTS UPON SENIOR SECURITIES

    Not applicable.

    ITEM 4.    MINE SAFETY DISCLOSURES

    Not applicable.

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    ITEM 5.    OTHER INFORMATION

    During the quarter ended March 31, 2025, no director or Section 16 officer of the Company adopted or terminated any contract, instruction or written plan for the purchase or sale of securities of the Company intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) of the Exchange Act or any “non-Rule 10b5-1 trading arrangement” (as defined in the Exchange Act).

    ITEM 6.    EXHIBITS

    Readers of this report should not rely on or assume the accuracy of any representation or warranty or the validity of any opinion contained in any agreement filed as an exhibit to this Quarterly Report, because such representation, warranty or opinion may be subject to exceptions and qualifications contained in separate disclosure schedules, may represent an allocation of risk between parties in the particular transaction, may be qualified by materiality standards that differ from what may be viewed as material for securities law purposes, or may no longer continue to be true as of any given date. All exhibits attached to this Quarterly Report are included for the purpose of complying with requirements of the SEC. Other than the certifications made by our officers pursuant to the Sarbanes-Oxley Act of 2002 included as exhibits to this Quarterly Report, all exhibits are included only to provide information to investors regarding their respective terms and should not be relied upon as constituting or providing any factual disclosures about us, any other persons, any state of affairs or other matters.

    The following exhibits are filed as part of this Quarterly Report:
    Exhibit No.Exhibit Description
    3.1
    Amended Certificate of Incorporation of ONE Gas, Inc., dated May 24, 2018 (incorporated by reference to Exhibit 3.1 to ONE Gas, Inc.’s Current Report on Form 8-K filed on May 30, 2018 (File No. 1-36108)).
    3.2
    Amended and Restated By-Laws of ONE Gas, Inc. dated February 21, 2023 (incorporated by reference to Exhibit 3.1 to ONE Gas, Inc.’s Current Report on Form 8-K filed on February 21, 2023 (File No. 1-36108)).
    10.1
    Form of 2025 Restricted Unit Award Agreement (incorporated by reference to Exhibit 10.14 to ONE Gas, Inc.’s Annual Report on Form 10-K filed on February 20, 2025 (File No. 1-36108)).
    10.2
    Form of 2025 Performance Unit Award Agreement (incorporated by reference to Exhibit 10.15 to ONE Gas, Inc.’s Annual Report on Form 10-K filed on February 20, 2025 (File No. 1-36108)).
    31.1
    Certification of Robert S. McAnnally pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
    31.2
    Certification of Christopher P. Sighinolfi pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
    32.1
    Certification of Robert S. McAnnally pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished only pursuant to Rule 13a-14(b)).
    32.2
    Certification of Christopher P. Sighinolfi pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished only pursuant to Rule 13a-14(b)).
    35

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    101.INSXBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
    101.SCHXBRL Schema Document.
    101.CALXBRL Calculation Linkbase Document.
    101.LABXBRL Label Linkbase Document.
    101.PREXBRL Presentation Linkbase Document.
    101.DEFXBRL Extension Definition Linkbase Document.
    104Cover Page Interactive Data File (embedded within the Inline XBRL document and contained in Exhibit 101).

    Attached as Exhibit 101 to this Quarterly Report are the following XBRL-related documents: (i) Document and Entity Information; (ii) Consolidated Statements of Income for the three months ended March 31, 2025 and 2024; (iii) Consolidated Statements of Comprehensive Income for the three months ended March 31, 2025 and 2024; (iv) Consolidated Balance Sheets at March 31, 2025 and December 31, 2024; (v) Consolidated Statements of Cash Flows for the three months ended March 31, 2025 and 2024; (vi) Consolidated Statements of Equity for the three months ended March 31, 2025 and 2024; and (vii) Notes to Consolidated Financial Statements.

    We also make available on our website the Interactive Data Files submitted as Exhibit 101 to this Quarterly Report.
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    SIGNATURE

    Pursuant to the requirements of the Exchange Act, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

    Date: May 6, 2025
    ONE Gas, Inc.
    Registrant
    By:/s/ Christopher P. Sighinolfi
    Christopher P. Sighinolfi
    Senior Vice President and
    Chief Financial Officer
    (Principal Financial Officer)


    37
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    • ONE Gas, Inc. Announces Pricing of a Public Offering of 2,500,000 Shares of Common Stock

      TULSA, Okla., May 8, 2025 /PRNewswire/ -- ONE Gas, Inc. ("ONE Gas") (NYSE:OGS) announced today that it has priced its public offering of 2,500,000 shares of its common stock for approximate gross proceeds of $197,500,000 (before offering expenses and underwriting discounts and commissions, assuming the underwriter does not exercise its option to purchase additional shares and upon, and assuming, full physical settlement of the forward sale agreement). In connection with the offering, ONE Gas entered into a forward sale agreement with JPMorgan Chase Bank, National Association, referred to in such capacity as the forward purchaser. In connection with the forward sale agreement, the forward pur

      5/8/25 10:06:00 PM ET
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    • ONE Gas, Inc. Announces Public Offering of 2,500,000 Shares of Common Stock

      TULSA, Okla., May 8, 2025 /PRNewswire/ -- ONE Gas, Inc. ("ONE Gas") (NYSE:OGS) announced today that it plans to make a public offering of 2,500,000 shares of its common stock. In connection with the offering, ONE Gas intends to enter into a forward sale agreement with JPMorgan Chase Bank, National Association, referred to in such capacity as the forward purchaser. In connection with the forward sale agreement, the forward purchaser or its affiliate, acting as forward seller, at ONE Gas' request, expects to borrow from third parties and sell 2,500,000 shares of ONE Gas' common stock to the underwriter in the offering in connection with the forward sale agreement described below.  As part of t

      5/8/25 4:27:00 PM ET
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    • ONE Gas Announces First Quarter 2025 Financial Results; Expects to Achieve the Upper Half of 2025 Financial Guidance; Declares Second Quarter Dividend

      Analyst call and webcast scheduled tomorrow, May 6 at 11 a.m. EST TULSA, Okla., May 5, 2025 /PRNewswire/ -- ONE Gas, Inc. (NYSE:OGS) today announced its first-quarter financial results, said that it expects to achieve the upper half of its previously announced 2025 financial guidance and declared its quarterly dividend.  "We achieved strong financial results in the first quarter due to our effective regulatory strategy and a disciplined approach to managing expenses," said Robert S. McAnnally, president and chief executive officer. "Safety remains our top priority as we serve

      5/5/25 4:15:00 PM ET
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      Oil/Gas Transmission
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    • ONE Gas Announces First Quarter 2025 Financial Results; Expects to Achieve the Upper Half of 2025 Financial Guidance; Declares Second Quarter Dividend

      Analyst call and webcast scheduled tomorrow, May 6 at 11 a.m. EST TULSA, Okla., May 5, 2025 /PRNewswire/ -- ONE Gas, Inc. (NYSE:OGS) today announced its first-quarter financial results, said that it expects to achieve the upper half of its previously announced 2025 financial guidance and declared its quarterly dividend.  "We achieved strong financial results in the first quarter due to our effective regulatory strategy and a disciplined approach to managing expenses," said Robert S. McAnnally, president and chief executive officer. "Safety remains our top priority as we serve

      5/5/25 4:15:00 PM ET
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    • ONE Gas to Participate in American Gas Association Financial Forum

      TULSA, Okla., April 17, 2025 /PRNewswire/ -- ONE Gas, Inc. (NYSE:OGS) today announced it will participate in the American Gas Association Financial Forum, May 18-20, 2025, in Marco Island, Florida. Robert S. McAnnally, president and chief executive officer, Curtis Dinan, senior vice president and chief operating officer, and Christopher Sighinolfi, senior vice president and chief financial officer, will be conducting a series of meetings with members of the investment community. The materials utilized during the conference will be accessible on the ONE Gas website, www.onegas.

      4/17/25 4:15:00 PM ET
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    • ONE Gas First Quarter 2025 Conference Call and Webcast Scheduled

      TULSA, Okla., April 8, 2025 /PRNewswire/ -- ONE Gas, Inc. (NYSE:OGS) will release its first quarter 2025 financial results after the market closes on Monday, May 5, 2025. The ONE Gas executive management team will participate in a conference call the following day, Tuesday, May 6, 2025, at 11 a.m. Eastern Daylight Time (10 a.m. Central Daylight Time). The call will also be carried live on the ONE Gas website. Event: ONE Gas first quarter 2025 earnings conference call and webcast Date and Time: May 6, 2025 11 a.m. Eastern, 10 a.m. Central Phone Number: Dial 833-470-1428, pass c

      4/8/25 4:15:00 PM ET
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