欧尼克(万欧卡) 2025年度报告

X ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended December 31, 2025 OR _TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the transition period from_______________to_______________ Commission file number001-13643 A. Full title of the plan and the address of the plan, if different from that of the issuer named below: ONEOK, INC. 401(k) PLAN B. Name of issuer of the securities held pursuant to the plan and the address of its principal executive office: ONEOK, Inc.100 West Fifth StreetTulsa, Oklahoma 74103 ONEOK, INC. 401(k) PLAN TABLE OF CONTENTS The following financial statements and schedule prepared in accordance with the financial reporting requirements of the EmployeeRetirement Income Security Act of 1974, as amended (ERISA), and exhibits are filed for the ONEOK, Inc. 401(k) Plan: Financial Statements and SchedulePageReport of Independent Registered Public Accounting Firm3Financial Statements:Statements of Net Assets Available for Benefits - December 31, 2025 and 20244Statement of Changes in Net Assets Available for Benefits - Year Ended December 31, 20255Notes to Financial Statements6Schedule:Schedule H, Line 4i - Schedule of Assets (Held at End of Year)13Signatures14Exhibit Index1523 - Consent of Independent Registered Public Accounting Firm All other schedules required by the Department of Labor’s Rules and Regulations for Reporting and Disclosure under ERISA areomitted as they are inapplicable or not required. REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM ONEOK, Inc. Audit CommitteeONEOK, Inc. Benefit Plan Administration Committee and Plan ParticipantsONEOK, Inc. 401(k) PlanTulsa, Oklahoma Opinion on the Financial Statements We have audited the accompanying statements of net assets available for benefits of ONEOK, Inc. 401(k) Plan (Plan) as of December31, 2025 and 2024, the related statement of changes in net assets available for benefits for the year ended December 31, 2025, and therelated notes (collectively referred to as the “financial statements”). In our opinion, the financial statements referred to above presentfairly, in all material respects, the net assets available for benefits of the Plan as of December 31, 2025 and 2024, and the changes innet assets available for benefits for the year ended December 31, 2025, in conformity with accounting principles generally accepted inthe United States of America. Basis of Opinion These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on thesefinancial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (“PCAOB”) and arerequired to be independent with respect to the Plan in accordance with the U.S. federal securities laws and the applicable rules andregulations of the Securities and Exchange Commission and the PCAOB. We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the auditsto obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud.The Plan is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part ofour audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressingan opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due toerror or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidenceregarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles usedand significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believethat our audits provide a reasonable basis for our opinion. Report on Supplemental Information The supplemental information in the accompanying Schedule H, Line 4i – Schedule of Assets (Held at End of Year) as of December31, 2025, has been subjected to audit procedures performed in conjunction with the audit of the Plan’s financial statements. Thesupplemental schedule is the responsibility of the Plan’s management. Our audit procedures included determining whether thesupplemental schedule reconciles to the financial statements or the underlying accounting and other records, as applicable, andperforming procedures to test the completeness and accuracy of the information presented in the supplemental schedule. In formingour opinion on the supplemental schedule, we evaluated whether the supplement