WILLIAMS COMPANIES, INC. 10-K

Item 9A. Controls and Procedures Williams Disclosure Controls and Procedures Williams’ management, including the Principal Executive Officer and Principal Financial Officer, does not expect that disclosure controls and procedures (as defined in Rules 13a - 15(e) and 15d - 15(e) of the Exchange Act) (Disclosure Controls) or internal control over financial reporting (Internal Controls) will prevent all errors and all fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within the company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of simple errors or mistakes. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the control. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected. Williams monitors the Disclosure Controls and Internal Controls and makes modifications as necessary; Williams’ intent in this regard is that the Disclosure Controls and Internal Controls will be modified as systems change and conditions warrant. Evaluation of Disclosure Controls and Procedures An evaluation of the effectiveness of the design and operation of Williams’ Disclosure Controls was performed as of the end of the period covered by this report. This evaluation was performed under the supervision and with the participation of management, including the Principal Executive Officer and Principal Financial Officer. Based upon that evaluation, the Principal Executive Officer and Principal Financial Officer concluded that these Disclosure Controls are effective at a reasonable assurance level. Williams purchased Rimrock as part of the Rimrock Asset Purchase on January 31, 2025. Rimrock’s total revenues constituted approximately 2 percent of total revenues as shown in Williams’ consolidated financial statements for the year ended December 31, 2025. Rimrock’s total assets constituted approximately 1 percent of total assets as shown in Williams’ consolidated financial statements at December 31, 2025. Williams has excluded Rimrock’s disclosure controls and procedures that are subsumed by their internal control over financial reporting from the scope of management’s assessment of the effectiveness of Williams’ disclosure controls and procedures. This exclusion is in accordance with the guidance issued by the Staff of the Securities and Exchange Commission that an assessment of recent business combinations may be omitted from management’s assessment of internal control over financial reporting for one year following the acquisition. Changes in Internal Control Over Financial Reporting There have been no changes during the fourth quarter of 2025 that have materially affected, or are reasonably likely to materially affect, Williams’ Internal Control over Financial Reporting. Management’s Annual Report on Internal Control over Financial Reporting Management is responsible for establishing and maintaining adequate internal control over financial reporting (as defined in Rules 13a - 15(f) and 15d - 15(f) under the Exchange Act). Williams’ internal control over financial reporting is designed to provide reasonable assurance to management and the board of directors regarding the 192 preparation and fair presentation of financial statements in accordance with accounting principles generally accepted in the United States. Williams’ internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of assets; (ii) provide reasonable assurance that transactions are recorded as to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures are being made only in accordance with authorization of management and the board of directors; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of assets that could have a material effect on Williams’ financial statements. All internal control systems, no matter how well designed, have inherent limitations including the possibility of human error and the circumvention or overriding of controls. Therefore, even those systems determined to be effective can provide only reasonable assurance with respect to financial statement preparation and presentation. Under the supervision and with the participation of Williams’ management, including the Principal Executive Officer and Principal Financial Officer, Williams assessed the effectiveness of the internal control over financial reporting at December 31, 2025, based on the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control — Integrated Framework (2013). Based on the assessment, which excluded Rimrock’s internal control over financial reporting as previously discussed, it was concluded that, at December 31, 2025, Williams’ internal control over financial reporting was effective. Ernst & Young LLP, Williams’ independent registered public accounting firm, has audited the internal control over financial reporting, as stated in their report which is included in this Annual Report on Form 10-K. 193 Report of Independent Registered Public Accounting Firm To the Shareholders and the Board of Directors of The Williams Companies, Inc. Opinion on Internal Control Over Financial Reporting We have audited The Williams Companies, Inc.’s internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In our opinion, The Williams Companies, Inc. (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2025, based on the COSO criteria. As indicated in the accompanying Management’s Annual Report on Internal Control over Financial Reporting, management’s assessment of and conclusion on the effectiveness of internal control over financial reporting did not include the internal controls of a group of natural gas gathering and processing assets purchased from Rimrock Energy Partners, LLC (Rimrock), which is included in the 2025 consolidated financial statements of the Company and constituted approximately one percent of total assets as of December 31, 2025. Our audit of internal control over financial reporting of the Company also did not include an evaluation of the internal control over financial reporting of Rimrock. We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheet of the Company as of December 31, 2025 and 2024, the related consolidated statements of income, comprehensive income (loss), changes in equity and cash flows for each of the three years in the period ended December 31, 2025, and the related notes and the financial statement schedule listed in the index at Item 15(a) and our report dated February 24, 2026 expressed an unqualified opinion thereon. Basis for Opinion The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Annual Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB. We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion. Definition and Limitations of Internal Control Over Financial Reporting A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements. 194 Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. /s/ Ernst & Young LLP Tulsa, Oklahoma February 24, 2026 Transco Disclosure Controls and Procedures Transco’s management, including the Principal Executive Officer and Principal Financial Officer, does not expect that the disclosure controls and procedures (as defined in Rules 13a - 15(e) and 15d - 15(e) of the Exchange Act) (Disclosure Controls) or internal control over financial reporting (Internal Controls) will prevent all errors and all fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within the company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of simple errors or mistakes. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the control. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected. Transco monitors the Disclosure Controls and Internal Controls and makes modifications as necessary; Transco’s intent in this regard is that the Disclosure Controls and Internal Controls will be modified as systems change and conditions warrant. Evaluation of Disclosure Controls and Procedures An evaluation of the effectiveness of the design and operation of Transco’s Disclosure Controls was performed as of the end of the period covered by this report. This evaluation was performed under the supervision and with the participation of management, including the Principal Executive Officer and Principal Financial Officer. Based upon that evaluation, the Principal Executive Officer and Principal Financial Officer concluded that these Disclosure Controls are effective at a reasonable assurance level. Changes in Internal Control Over Financial Reporting There have been no changes during the fourth quarter of 2025 that have materially affected, or are reasonably likely to materially affect, Transco’s Internal Control over Financial Reporting. Management’s Annual Report on Internal Control over Financial Reporting Management is responsible for establishing and maintaining adequate internal control over financial reporting (as defined in Rules 13a - 15(f) and 15d - 15(f) under the Exchange Act). Transco’s internal control over financial reporting is designed to provide reasonable assurance to management regarding the preparation and fair presentation of financial statements in accordance with accounting principles generally accepted in the United States. Transco’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of assets; (ii) provide reasonable assurance that transactions are recorded as to permit preparation of financial statements in accordance with generally accepted accounting principles, and that the receipts and expenditures are being made only in accordance with authorization of management; and (iii) provide reasonable assurance regarding prevention or timely 195 detection of unauthorized acquisition, use or disposition of assets that could have a material effect on Transco’s financial statements. All internal control systems, no matter how well designed, have inherent limitations including the possibility of human error and the circumvention or overriding of controls. Therefore, even those systems determined to be effective can provide only reasonable assurance with respect to financial statement preparation and presentation. Under the supervision and with the participation of Transco’s management, including the Principal Executive Officer and Principal Financial Officer, Transco assessed the effectiveness of internal control over financial reporting at December 31, 2025, based on the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control — Integrated Framework (2013). Based on the assessment, it was concluded that, at December 31, 2025, Transco’s internal control over financial reporting was effective. NWP Disclosure Controls and Procedures NWP’s management, including the Principal Executive Officer and Principal Financial Officer, does not expect that the disclosure controls and procedures (as defined in Rules 13a - 15(e) and 15d - 15(e) of the Exchange Act) (Disclosure Controls) or internal control over financial reporting (Internal Controls) will prevent all errors and all fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within the company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of simple errors or mistakes. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the control. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected. NWP monitors the Disclosure Controls and Internal Controls and makes modifications as necessary; NWP’s intent in this regard is that the Disclosure Controls and Internal Controls will be modified as systems change and conditions warrant. Evaluation of Disclosure Controls and Procedures An evaluation of the effectiveness of the design and operation of NWP’s Disclosure Controls was performed as of the end of the period covered by this report. This evaluation was performed under the supervision and with the participation of NWP’s management, including the Principal Executive Officer and Principal Financial Officer. Based upon that evaluation, the Principal Executive Officer and Principal Financial Officer concluded that these Disclosure Controls are effective at a reasonable assurance level. Changes in Internal Control Over Financial Reporting There have been no changes during the fourth quarter of 2025 that have materially affected, or are reasonably likely to materially affect, NWP’s Internal Control over Financial Reporting. Management’s Annual Report on Internal Control over Financial Reporting Management is responsible for establishing and maintaining adequate internal control over financial reporting (as defined in Rules 13a - 15(f) and 15d - 15(f) under the Exchange Act). NWP’s internal control over financial reporting is designed to provide reasonable assurance to management regarding the preparation and fair presentation of financial statements in accordance with accounting principles generally accepted in the United States. NWP’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of assets; (ii) provide 196 reasonable assurance that transactions are recorded as to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures are being made only in accordance with authorization of management; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of assets that could have a material effect on NWP’s financial statements. All internal control systems, no matter how well designed, have inherent limitations including the possibility of human error and the circumvention or overriding of controls. Therefore, even those systems determined to be effective can provide only reasonable assurance with respect to financial statement preparation and presentation. Under the supervision and with the participation of NWP’s management, including the Principal Executive Officer and Principal Financial Officer, NWP assessed the effectiveness of the internal control over financial reporting at December 31, 2025, based on the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control — Integrated Framework (2013). Based on the assessment, it was concluded that, at December 31, 2025, NWP’s internal control over financial reporting was effective. Item 9B. Other Information Departure of Director On February 20, 2026, Stacey Doré notified Williams that she has elected not to stand for re-election and will depart Williams’ Board of Directors when her term expires on April 28, 2026. Ms. Doré is a member of the Audit Committee and Governance and Sustainability Committee. Following Ms. Doré’s departure, the size of Williams’ Board of Directors will be reduced to eleven directors. Rule 10b5-1 Trading Arrangements During the three months ended December 31, 2025, no director or officer of Williams adopted or terminated a “Rule 10b5-1 trading arrangement,” and no director or officer of Williams adopted or terminated a “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408(a) of Regulation S-K. Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections Not applicable. PART III Since Transco and NWP meet the conditions set forth in General Instructions (I)(1)(a) and (b) of Form 10‑K, the information required by Items 10, 11, 12, and 13, is omitted for Transco and NWP. Item 10. Directors, Executive Officers and Corporate Governance The information regarding Williams’ directors and nominees for director required by Item 401 of Regulation S‑K will be presented under the heading “Election of Directors” in Williams’ definitive proxy statement prepared for the solicitation of proxies in connection with its Annual Meeting of Stockholders to be held April 28, 2026, which shall be filed no later than March 19, 2026 (“Proxy Statement”), which information is incorporated by reference herein. Information regarding Williams’ executive officers required by Item 401 of Regulation S-K is presented at the end of Part I herein and captioned “Information About Williams’ Executive Officers,” as permitted by General Instruction G(3) and the Instruction to Item 401 of Regulation S-K. Information required by paragraphs (c), (d)(4) and (d)(5) of Item 407 of Regulation S-K will be included under the heading “Questions and Answers About the Annual Meeting and Voting” and “Corporate Governance” in the Proxy Statement, which information is incorporated by reference herein. 197 Information regarding Williams’ insider trading policy required by Item 408 of Regulation S-K will be included under the headings “Executing on Effective Corporate Governance” and “Mitigating Risk in Williams’ Compensation Programs” in the Proxy Statement, which information is incorporated by reference herein. Williams has adopted The Williams Policy on Securities Trading (“Securities Trading Policy”) that is applicable to Williams’ directors, officers, employees, and “any other person providing services to Williams who is aware of Material Nonpublic Information relating to Williams or other public companies,” as well as “family members of persons covered by this policy, others living in their households, and entities that are directed by or subject to their influence or control.” A copy of the Securities Trading Policy is filed as Exhibit 19.1 to this annual report on Form 10‑K. Williams complies with applicable laws, rules, regulations and listing standards when it transacts in its own securities. Williams’ Corporate Governance Guidelines, the charters for each of Williams’ board committees, and Williams’ Code of Business Conduct applicable to all employees, including Williams’ Chief Executive Officer, Chief Financial Officer, and Chief Accounting Officer, or persons performing similar functions, are available on Williams’ Internet website at www.williams.com. Williams will provide, free of charge, a copy of Williams’ Code of Business Conduct or any of its other corporate documents listed above upon written request to Williams’ Corporate Secretary at Williams, One Williams Center, Suite 4700, Tulsa, Oklahoma 74172. We intend to disclose any amendments to or waivers, in each case, of the Code of Business Conduct on behalf of Williams’ Chief Executive Officer, Chief Financial Officer, Chief Accounting Officer, and persons performing similar functions on the corporate governance section of Williams’ Internet website at www.williams.com , promptly following the date of any such amendment or waiver. Item 11. Executive Compensation The information required by Item 402 and paragraphs (e)(4) and (e)(5) of Item 407 of Regulation S-K regarding executive compensation will be presented under the headings “Compensation Discussion and Analysis,” “Executive Compensation Tables and Other Information,” “Director Compensation For Fiscal Year 2025,” “Compensation and Management Development Committee Report,” and “Compensation and Management Development Committee Interlocks and Insider Participation” in the Proxy Statement, which information is incorporated by reference herein. Notwithstanding the foregoing, the information provided under the heading “Compensation and Management Development Committee Report” in the Proxy Statement is furnished and shall not be deemed to be filed for purposes of Section 18 of the Exchange Act, is not subject to the liabilities of that section and is not deemed incorporated by reference in any filing under the Securities Act. The information required by Item 408(x) regarding policies and practices related to the grant of certain equity awards close in time to the release of material nonpublic information will be presented under the heading “Compensation Discussion and Analysis” in the Proxy Statement, which information is incorporated by reference herein. Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters The information regarding securities authorized for issuance under equity compensation plans required by Item 201(d) of Regulation S-K and the security ownership of certain beneficial owners and management required by Item 403 of Regulation S-K will be presented under the headings “Securities Authorized For Issuance Under Equity Compensation Plans” and “Security Ownership of Certain Beneficial Owners and Management” in the Proxy Statement, which information is incorporated by reference herein. Item 13. Certain Relationships and Related Transactions, and Director Independence The information regarding certain relationships and related transactions required by Item 404 and Item 407(a) of Regulation S-K will be presented under the heading “Election of Directors” in the Proxy Statement, which information is incorporated by reference herein. 198 Item 14. Principal Accountant Fees and Services The information regarding Williams’ principal accounting fees and services required by Item 9(e) of Schedule 14A will be presented under the heading “Principal Accountant Fees and Services” in the Proxy Statement, which information is incorporated by reference herein. Fees for professional services provided by Transco and NWP’s independent registered public accounting firm in each of the last two fiscal years in each of the following categories are (in millions): Transco Year Ended December 31, 2025 2024 Audit fees $ 1 $ 1 Audit-related fees — — Tax fees — — All other fees — — Total fees $ 1 $ 1 NWP Year Ended December 31, 2025 2024 Audit fees $ 1 $ 1 Audit-related fees — — Tax fees — — All other fees — — Total fees $ 1 $ 1 Fees for audit services include fees associated with the annual audit, the reviews for Transco and NWP’s quarterly reports on Form 10-Q, the reviews for other SEC and FERC filings, and accounting consultation. As wholly owned subsidiaries of Williams, Transco and NWP do not have separate audit committees. The Williams Audit Committee is responsible for the appointment, compensation, retention, and oversight of Ernst & Young LLP (EY) as such appointment relates to Transco, NWP, and Williams’ other subsidiaries. The Williams Audit Committee is responsible for overseeing the determination of fees associated with EY’s audit of Transco and NWP’s financial statements. The Williams Audit Committee has established a policy regarding pre-approval of all audit and non-audit services provided by EY to Williams and its subsidiaries. On an ongoing basis, management presents specific projects and categories of service, including projects and categories of service relating to Transco and NWP, to the Williams Audit Committee to request advance approval. The Williams Audit Committee reviews those requests and advises management if the Williams Audit Committee approves the engagement of EY. On a periodic basis, management reports to the Williams Audit Committee regarding the actual spending for such projects and services compared to the approved amounts. The Williams Audit Committee may also delegate the authority to pre-approve audit and permitted non-audit services, excluding services related to internal control over financial reporting, to a subcommittee of one or more committee members, provided that any such pre-approvals are reported on at a subsequent Williams Audit Committee meeting. 199 PART IV Item 15. Exhibits and Financial Statement Schedules Williams (a) 1 and 2. Page Covered by report of independent auditors (PCAOB ID: 42 ): Consolidated statement of income for each year in the three-year period ended December 31, 2025 95 Consolidated statement of comprehensive income (loss) for each year in the three-year period ended December 31, 2025 96 Consolidated balance sheet at December 31, 2025 and 2024 97 Consolidated statement of changes in equity for each year in the three-year period ended December 31, 2025 98 Consolidated statement of cash flows for each year in the three-year period ended December 31, 2025 99 Combined N otes to F inancial S tatements 112 Schedule for each year in the three-year period ended December 31, 2025: II — Valuation and qualifying accounts 191 All other schedules have been omitted since the required information is not present or is not present in amounts sufficient to require submission of the schedule, or because the information required is included in the financial statements and notes thereto. (a) 3 and (b). The exhibits listed below are filed as part of this annual report. INDEX TO EXHIBITS Exhibit No. Description 3.1 — Amended and Restated Certificate of Incorporation, (filed on May 26, 2010, as Exhibit 3.(i)1 to The Williams Companies Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 3.2 — Certificate of Designations of Series B Preferred Stock of the Williams Companies, Inc. (filed on July17, 2018, as Exhibit 3.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and Incorporated herein by reference). 3.3 — Certificate of Amendment dated August 10, 2018 (filed on August 10, 2018, as Exhibit 3.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 3.4 — By-laws of The Williams Companies, Inc., as last amended effective October 25, 2022 (filed on October 31, 2022, as Exhibit 3.4 to The Williams Companies Inc.’s quarterly report on Form 10-Q (File No. 001-04174) and incorporated herein by reference). 4.1 — Senior Indenture, dated February 25, 1997, between MAPCO Inc. and Bank One Trust Company, N.A. (formerly The First National Bank of Chicago), as Trustee (filed on February 25, 1997, as Exhibit 4.5.1 to MAPCO Inc.’s Amendment No. l to registration statement on Form S-3 (File No. 333-20837) and incorporated herein by reference). 200 Exhibit No. Description 4.2 — Supplemental Indenture No. 2, dated March 5, 1997, between MAPCO Inc. and Bank One Trust Company, N.A. (formerly The First National Bank of Chicago), as Trustee (filed on March 4, 1998, as Exhibit 4(p) to MAPCO Inc.’s annual report on Form 10-K for the fiscal year ended December 31, 1997 (File No. 001-05254) and incorporated herein by reference). 4.3 — Supplemental Indenture No. 3, dated March 31, 1998, among MAPCO Inc., Williams Holdings of Delaware, Inc. and Bank One Trust Company, N.A. (formerly The First National Bank of Chicago), as Trustee (filed on March 30, 1999, as Exhibit 4(J) to Williams Holdings of Delaware, Inc.’s annual report on Form 10-K for the fiscal year ended December 31, 1998 (File No. 000-20555) and incorporated herein by reference). 4.4 — Fourth Supplemental Indenture, dated as of July 31, 1999, among Williams Holdings of Delaware, Inc., The Williams Companies, Inc. and Bank One Trust Company, N.A. (formerly The First National Bank of Chicago), as Trustee (filed on March 28, 2000, as Exhibit 4(q) to The Williams Companies, Inc.’s annual report on Form 10-K (File No. 001-04174) and incorporated herein by reference). 4.5 — Fifth Supplemental Indenture, dated as of February 1, 2010, between The Williams Companies, Inc. and The Bank of New York Mellon Trust Company, N.A. (filed on February 2, 2010, as Exhibit 4.3 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.6 — Fifth Supplemental Indenture between The Williams Companies, Inc. and Bank One Trust Company, N.A., as Trustee, dated as of January 17, 2001 (filed on March 12, 2001, as Exhibit 4(k) to The Williams Companies, Inc.’s annual report on Form 10-K (File No. 001-04174) and incorporated herein by reference). 4.7 — Seventh Supplemental Indenture, dated March 19, 2002, between The Williams Companies, Inc. as Issuer and Bank One Trust Company, National Association, as Trustee (filed on May 9, 2002, as Exhibit 4.1 to The Williams Companies, Inc.’s quarterly report on Form 10-Q (File No. 001-04174) and incorporated herein by reference). 4.8 — Eleventh Supplemental Indenture, dated as of February 1, 2010, between The Williams Companies, Inc. and The Bank of New York Mellon Trust Company, N.A. (filed on February 2, 2010, as Exhibit 4.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.9 — Indenture, dated December 18, 2012, between The Williams Companies, Inc. and The Bank of New York Mellon Trust Company, N.A. as trustee (filed on December 20, 2012, as Exhibit 4.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.10 — Second Supplemental Indenture, dated as of June 24, 2014, between The Williams Companies, Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on June 24, 2014, as Exhibit 4.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.11 — Third Supplemental Indenture, dated as of May 14, 2020, between The Williams Companies, Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on May 14, 2020, as Exhibit 4.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.12 — Fourth Supplemental Indenture, dated as of March 2, 2021, between The Williams Companies, Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on March 2, 2021, as Exhibit 4.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 201 Exhibit No. Description 4.13 — Fifth Supplemental Indenture, dated as of October 8, 2021, between The Williams Companies, Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on October 8, 2021, as Exhibit 4.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference) . 4.14 — Sixth Supplemental Indenture, dated as of August 8, 2022, between The Williams Companies, Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on August 8, 2022, as Exhibit 4.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.15 — Seventh Supplemental Indenture, dated as of March 2, 2023, between The Williams Companies, Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on March 2, 2023, as Exhibit 4.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.16 — Eighth Supplemental Indenture, dated as of August 10, 2023, between The Williams Companies, Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on August 10, 2023, as Exhibit 4.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.17 — Ninth Supplemental Indenture, dated as of January 5, 2024, between The Williams Companies, Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on January 5, 2024, as Exhibit 4.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.18 — Tenth Supplemental Indenture, dated as of August 13, 2024, between The Williams Companies, Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on August 13, 2024, as Exhibit 4.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.19 — Eleventh Supplemental Indenture, dated as of January 9, 2025, between The Williams Companies, Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on January 10, 2025, as Exhibit 4.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.20 — T welfth Supplemental Indenture, dated as of J une 30, 2025, between The Williams Companies, Inc. and The B ank of New York Mellon Trust Company, N.A., as trustee (filed on J un e 30, 2025, as Exhibit 4.1 to The Williams Companies, Inc. ’ s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.21 — Thirteenth Supplemental Indenture, dated as of January 8, 2026 , between The Williams Companies, Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on January 8, 2026, as E xhibit 4.1 to The Williams Companies, Inc. ’ s current report on From 8-K (File No. 001-04174) and incorporated herein by reference. 4.22 — Indenture, dated as of February 9, 2010, between Williams Partners L.P. and The Bank of New York Mellon Trust Company, N.A. (filed on February 10, 2010, as Exhibit 4.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.23 — First Supplemental Indenture, dated as of February 2, 2015, between Williams Partners L.P. and The Bank of New York Mellon Trust Company, N.A. (filed on February 3, 2015, as Exhibit 4.5 to Williams Partners L.P.’s current report on Form 8-K (File No. 001-34831) and incorporated herein by reference). 202 Exhibit No. Description 4.24 — Second Supplemental Indenture, dated as of August 10, 2018, between The Williams Companies, Inc. and The Bank of New York Mellon Trust Company, N.A. (filed on August 10, 2018, as Exhibit 4.2 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.25 — Indenture, dated as of November 9, 2010, between Williams Partners L.P. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on November 12, 2010, as Exhibit 4.1 to Williams Partners L.P.’s current report on Form 8-K (File No. 001-32599) and incorporated herein by reference). 4.26 — Fifth Supplemental Indenture, dated as of March 4, 2014, between Williams Partners L.P. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on March 4, 2014, as Exhibit 4.1 to Williams Partners L.P.’s current report on Form 8-K (File No. 001-32599) and incorporated herein by reference). 4.27 — Sixth Supplemental Indenture, dated as of June 27, 2014, between Williams Partners L.P. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on June 27, 2014, as Exhibit_4.1 to Williams Partners L.P.’s current report on Form 8-K (File No. 001-32599) and incorporated herein by reference). 4.28 — Seventh Supplemental Indenture, dated as of February 2, 2015, between Williams Partners L.P. and The Bank of New York Mellon Trust Company, N.A. (filed on February 3, 2015, as Exhibit_4.4 to Williams Partners L.P.’s current report on Form 8-K (File No. 001-34831) and incorporated herein by reference). 4.29 — Eighth Supplemental Indenture, dated as of March 3, 2015, between Williams Partners L.P. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on March 3, 2015, as Exhibit 4.1 to Williams Partners L.P.’s current report on Form 8-K (File No. 001-34831) and incorporated herein by reference). 4.30 — Ninth Supplemental Indenture, dated as of June 5, 2017, between Williams Partners L.P. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on June 5, 2017, as Exhibit 4.1 to Williams Partners L.P.’s current report on Form 8-K (File No. 001-34831) and incorporated herein by reference). 4.31 — Tenth Supplemental Indenture, dated as of March 5, 2018, between Williams Partners L.P. and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on March 5, 2018, as Exhibit 4.1 to Williams Partners L.P.’s current report on Form 8-K (File No. 001-34831) and incorporated herein by reference). 4.32 — Eleventh Supplemental Indenture, dated as of August 10, 2018, between The Williams Companies Inc. and The Bank of New York Mellon Trust Company, N.A. (filed on August 10, 2018, as Exhibit 4.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.33 — Indenture, dated as of April 3, 2017, between Northwest Pipeline LLC and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on April 3, 2017, as Exhibit 4.1 to Northwest Pipeline’s current report on Form 8-K (File No. 001-07414) and incorporated herein by reference). 4.34 — Senior Indenture, dated as of July 15, 1996, between Transcontinental Gas Pipe Line Corporation and Citibank, N.A., as Trustee (filed on April 2, 1996, as Exhibit 4.1 to Transcontinental Gas Pipe Line Corporation’s registration statement on Form S-3 (File No. 333-02155) and incorporated herein by reference). 203 Exhibit No. Description 4.35 — Indenture, dated as of August 12, 2011, between Transcontinental Gas Pipe Line Company, LLC and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on August 12, 2011, as Exhibit 4.1 to Transcontinental Gas Pipe Line Company, LLC’s current report on Form 8-K (File No. 001-07584) and incorporated herein by reference). 4.36 — Indenture, dated as of July 13, 2012, between Transcontinental Gas Pipe Line Company, LLC and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on July 16, 2012 , as Exhibit 4.1 to Transcontinental Gas Pipe Line Company, LLC’s current report on Form 8-K (File No. 001-07584) and incorporated herein by reference). 4.37 — Indenture, dated as of March 15, 2018, between Transcontinental Gas Pipe Line Company, LLC and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on March 15, 2018, as Exhibit 4.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.38 — Indenture, dated as of May 8, 2020, between Transcontinental Gas Pipe Line Company, LLC and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on May 8, 2020, as Exhibit 4.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.39 — I ndenture, dated as of November 20, 2025, between Transcontinental G as Pipe Line Company, LLC and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on November 20, 2025 , as Exhibit 4.1 to The Williams Companies, Inc. ’ s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 4.40 — Indenture, dated August 17, 1998, between Questar Pipeline Company and Wells Fargo Bank, N.A., as successor trustee (filed on August 17, 1998, as Exhibit 4.01 to the Questar Pipeline Company’s Registration Statement on Form S-3 (File No. 333-61621) and incorporated herein by reference. 4.41 — Officer’s Certificate (including the form of Questar Pipeline Company’s 4.875% Senior Notes due 2041) (filed on December 6, 2011, as Exhibit 4.1 to the Questar Pipeline Company’s current report on Form 8-K (File No. 001-14147) and incorporated herein by reference) . 4.42 — Dominion Energy Questar Pipeline Note Purchase Agreement (filed on February 21, 2024, as Exhibit 4.39 to The Williams Companies, Inc.’s annual report on Form 10-K (File No. 001-04174) and incorporated herein by reference). 4.43 — Description of Securities . 10.1§ — The Williams Companies Amended and Restated Retirement Restoration Plan amended effective as of January 1, 2024, (filed on February 21, 2024, as Exhibit 10.1 to The Williams Companies, Inc.’s annual report on Form 10-K (File No. 001-04174) and incorporated herein by reference). 10.2§ — Form of Director and Officer Indemnification Agreement (filed on September 24, 2008, as Exhibit 10.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 10.3§ — Form of 2013 Restricted Stock Unit Agreement among Williams and certain nonmanagement directors (filed on February 26, 2014, as Exhibit 10.11 to The Williams Companies, Inc.’s annual report on Form 10-K (File No. 001-04174) and incorporated herein by reference). 10.4§ — Form of 2014 Restricted Stock Unit Agreement among Williams and certain nonmanagement directors (filed on February 25, 2015, as Exhibit 10.12 to The Williams Companies, Inc.’s annual report on Form 10-K (File No. 001-04174) and incorporated herein by reference). 204 Exhibit No. Description 10.5§ — Form of 2015 Nonqualified Stock Option Agreement among Williams and certain employees and officers (filed on February 25, 2015, as Exhibit 10.17 to The Williams Companies, Inc.’s annual report on Form 10-K (File No. 001-04174) and incorporated herein by reference). 10.6§ — Form of 2016 Time-Based Restricted Stock Unit Agreement among Williams and certain non-management directors (filed on February 22, 2017, as Exhibit 10.21 to The Williams Companies, Inc.’s annual report on Form 10-K (File No. 001-04174) and incorporated herein by reference). 10.7§ — Form of 2016 Nonqualified Stock Option Agreement among Williams and certain employees and officers (filed on February 22, 2017, as Exhibit 10.22 to The Williams Companies, Inc.’s annual report on Form 10-K (File No. 001-04174) and incorporated herein by reference). 10.8§ — Form of 2017 Time-Based Restricted Stock Unit Agreement among Williams and certain non-management directors (filed on February 22, 2017, as Exhibit 10.24 to The Williams Companies, Inc.’s annual report on Form 10-K (File No. 001-04174) and incorporated herein by reference). 10.9§ — Form of 2017 Nonqualified Stock Option Agreement among Williams and certain employees and officers (filed on February 22, 2017, as Exhibit 10.25 to The Williams Companies, Inc.’s annual report on Form 10-K (File No. 001-04174) and incorporated herein by reference). 10.10 — Form of 2018 Nonqualified Stock Option Agreement among Williams and certain employees and officers (filed on May 3, 2018, as Exhibit 10.5 to The Williams Companies, Inc.’s quarterly report on Form 10-Q (File No. 001-04174) and incorporated herein by reference). 10.11§ — Form of 2018 Time-Based Restricted Stock Unit Agreement among Williams and certain non-management directors (filed on August 2, 2018, as Exhibit 10.2 to The Williams Companies, Inc.’s quarterly report on Form 10-Q (File No. 001-04174) and incorporated herein by reference). 10.12§ — Form of 2019 Time-Based Restricted Stock Unit Agreement among Williams and certain non-management directors (filed on May 2, 2019, as Exhibit 10.4 to The Williams Companies, Inc.’s quarterly report on Form 10-Q (File No. 001-04174) and incorporated herein by reference). 10.13§ — Form of 2020 Time-Based Restricted Stock Unit Agreement among The Williams Companies, Inc. and certain non-management directors (filed on May 4, 2020, as Exhibit 10.4 to The Williams Companies, Inc.’s quarterly report on Form 10-Q (File No. 001-04174) and incorporated herein by reference). 10.14§ — Form of Time-Based Restricted Stock Unit Agreement among The Williams Companies, Inc. and certain employees and officers (filed on February 28, 2022, as Exhibit 10.31 to The Williams Companies, Inc.’s annual report on Form 10-K (File No.001-04174) and incorporated herein by reference). 10.15§ — Form of Time-Based Restricted Stock Unit Agreement among The Williams Companies, Inc. and certain non-management directors (filed on February 24, 2021, as Exhibit 10.29 to The Williams Companies, Inc.’s annual report on Form 10-K (File No. 001-04174) and incorporated herein by reference). 10.16§ — Form of Performance-Based Restricted Stock Unit Agreement among The Williams Companies, Inc. and certain employees and officers (filed on February 28, 2022, as Exhibit 10.33 to The Williams Companies, Inc.’s annual report on Form 10-K (File No.001-04174) and incorporated herein by reference. 10.17§ — Form of Two-Year Ratable Restricted Stock Unit Agreement among The Williams Companies, Inc. and certain employees and officers (filed on May 3, 2023, as Exhibit 10.1 to The Williams Companies, Inc.’s quarterly report on Form 10-Q (File No. 001-04174) and incorporated herein by reference. 205 Exhibit No. Description 10.18§ — Form of Three-Year Ratable Restricted Stock Unit Agreement among The Williams Companies, Inc. and certain employees and officers (filed on May 3, 2023, as Exhibit 10.2 to The Williams Companies, Inc.’s quarterly report on Form 10-Q (File No. 001-04174) and incorporated herein by reference. 10.19§ — Form of 202 4 Performance-Based Restricted Stock Unit Award between The Williams Companies, Inc. and certain employees and officers (filed on May 6, 2024 , as Exhibit 10.1 to The Williams Companies, I nc. ’ s quarterly report on Form 10-Q (File No. 001-04174) and incorporated herein by reference. 10.20§ — F orm A of Performanc e-Based Restricted Stock Unit Agreement between The Williams Companies, Inc. and certain employees and officers for awards granted as of Feb ruary 2025 or later (filed on May 5, 2025 , as Exhibit 10.1 to The Williams Companies, Inc. ’ s quarterly report on Form 10-Q (File No. 001-04174) and incorporate d herein by reference . 10.21§ — F orm B of Perfor m a nce-Based Restricted Stock Unit Agreement between The Williams Companies, Inc. and certain employees and officers for awards granted as of February 2025 or later (filed on May 5, 202 5, as E xhibit 10.2 to The Williams Companies, Inc. ’ s quarterly report on Form 10-Q (File No. 001-04174) and incorporated herein by reference. 10.22§ — For m of Restricted Stock Unit Aw a rd Agreement between The Williams Companies, Inc. an d certain employees and officer for awards granted as of February 2025 or later (filed on May 5, 2025, as Exhi bit 10.3 to The Williams Companies, Inc. ’ s quarterly report on Form 10-Q (File No. 001-04174) and incorporated herein by reference. 10.23§ — F orm of Two-Year Ratable Restricted Stock Unit Agreement between The Williams Co mpanies, Inc. and certain employees and officers for awards granted as of February 2025 or later (filed on May 5, 202 5 , as Exh ibit 10.4 to The Williams Companies, Inc. ’ s quarterly report on F or m 10-Q (File No. 001-04174) and incorporated herein by reference. 10.24§ — F orm of Three - Year Ratable Restricted Stock Unit Agreement between The Williams Companies, Inc. and certain employees and officers for award granted as of February 2025 or later (filed on May 5, 2025 , as Exhibit 10.5 to The Williams Companies, Inc. ’ s quarterly report on Form 10-Q (File No. 001-04174) and incorporated herein by reference. 10.25§ — Retention Agreement dated July 14, 2025, between Will iams WPC-I, LLC, and Robert Wingo (filed on November 3, 2025, as Exhibit 10.1 to The Williams Companies, Inc. ’ s quarterly report on Form 10-Q (File No. 001 -004174) and incorporated her ein by reference. 10.26§ — Change in Control and Restrictive Covenant Agreement between certain executive officers (Tier One Executives) and The Williams Companies, Inc. (filed on February 24, 2020, as Exhibit 10.29 to The Williams Companies, Inc.’s annual report on Form 10-K (File No. 001-04174) and incorporated herein by reference). 10.27§ — Change in Control and Restrictive Covenant Agreement between certain executive officers (Tier Two Executives) and The Williams Companies, Inc. (filed on February 24, 2020, as Exhibit 10.30 to The Williams Companies, Inc.’s annual report on Form 10-K (File No. 001-04174) and incorporated herein by reference) . 10.28§ — The Williams Companies, Inc. Executive Severance Pay Plan, as amended and restated, effective August 1, 2022 (filed October 31, 2022, as Exhibit 10.1 to The Williams Companies, Inc.’s quarterly report on Form 10-Q (File No. 001-04174) and incorporated herein by reference). 10.29§ — The Williams Companies, Inc. 2007 Incentive Plan as amended and restated effective October 26, 2021 (filed on November 1, 2021, as Exhibit 10.9 to The Williams Companies, Inc.’s quarterly report on Form 10-Q (File No. 001-04174) and incorporated herein by reference). 206 Exhibit No. Description 10.30 — Amended and Restated Credit Agreement dated as of October 8, 2021, between The Williams Companies, Inc., Northwest Pipeline LLC, and Transcontinental Gas Pipe Line Company, LLC, as borrowers, the lenders named therein, and Wells Fargo Bank, National Association, as Administrative Agent (filed on October 8, 2021, as Exhibit 10.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 10.31 — Form of Commercial Paper Dealer Agreement, dated as of August 10, 2018, between The Williams Companies, Inc., as Issuer, and the Dealer party thereto (filed on August 10, 2018, as Exhibit 10.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 10.32 — Credit Agreement dated as of December 1, 2025, among Northwest Pipeline LLC, as borrower, the lenders named therein, and PNC Bank, National Association, as Administrative Agent (filed on December 1, 2025 , as Exhibit 10.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-07414) and incorporated herein by reference). 19.1* — Williams Policy on Securities Trading. 21* — Subsidiaries of the registrant. 23.1* — Consent of Independent Registered Public Accounting Firm, Ernst & Young LLP. 31.1* — Certification of the Chief Executive Officer pursuant to Rules 13a-l4(a) and 15d-14(a) promulgated under the Securities Exchange Act of 1934, as amended, and Item 601(b)(3l) of Regulation S-K, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. 31.2* — Certification of the Chief Financial Officer pursuant to Rules 13a-14(a) and l5d-l4(a) promulgated under the Securities Exchange Act of 1934, as amended, and Item 601(b)(31) of Regulation S-K, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. 32.1** — Certification of the Chief Executive Officer and the Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. 97.1 — The Williams Companies, Inc. Financial Statement Compensation Recoupment Policy (filed on February 21, 2024, as Exhibit 97.1 to The Williams Companies, Inc.’s current report on Form 10-K (File No. 001-04174) and incorporated herein by reference). 101.INS* — XBRL 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.SCH* — XBRL Taxonomy Extension Schema. 101.CAL* — XBRL Taxonomy Extension Calculation Linkbase. 101.DEF* — XBRL Taxonomy Extension Definition Linkbase. 101.LAB* — XBRL Taxonomy Extension Label Linkbase. 101.PRE* — XBRL Taxonomy Extension Presentation Linkbase. 207 Exhibit No. Description 104* — Cover Page Interactive Data File. The cover page interactive data file does not appear in the interactive data file because its XBRL tags are embedded within the inline XBRL document (contained in Exhibit 101). ______________ * Filed herewith ** Furnished herewith § Management contract or compensatory plan or arrangement 208 Transco (a) 1 and 2. Page Covered by report of independent auditors (PCAOB ID: 42 ): Statement of net income for each year in the three-year period ended December 31, 2025 102 Balance sheet at December 31, 2025 and 2024 103 Statement of changes in member’s equity for each year in the three-year period ended December 31, 2025 104 Statement of cash flows for each year in the three-year period ended December 31, 2025 105 Combined Notes to Financial Statements 112 All other schedules have been omitted since the required information is not present or is not present in amounts sufficient to require submission of the schedule, or because the information required is included in the financial statements and notes thereto. (a) 3 and (b). The exhibits listed below are filed as part of this annual report. INDEX TO EXHIBITS Exhibit No. Description 2 — Certificate of Conversion dated December 22, 2008 and effective December 31, 2008 (filed on February 24, 2011 , as Exhibit 2.1 to our annual report on Form 10-K (File No. 001-07584) and incorporated herein by reference). 3.5 — Certificate of Formation executed as of December 22, 2008 and effective December 31, 2008 (filed on February 24, 2011 , as Exhibit 3.1 to our annual report on Form 10-K (File No. 001-07584) and incorporated herein by reference). 3.6 — Amended and Restated Operating Agreement of Transcontinental Gas Pipe Line Company, LLC dated February 17, 2010 (filed on October 28, 2010 , as Exhibit 3.2 to our quarterly report on Form 10-Q (File No. 001-07584) and incorporated herein by reference). 4.44 — Senior Indenture dated July 15, 1996 , between Transcontinental Gas Pipe Line Corporation and Citibank, N.A., as Trustee (filed on April 2, 1996 , as Exhibit 4.1 to our registration statement Form S-3 (File No. 333-02155) and incorporated herein by reference). 4.45 — Indenture, dated as of August 12, 2011 , between Transcontinental Gas Pipe Line Company, LLC and The Bank of New York Mellon Trust Company, N.A., as Trustee (filed on August 12, 2011 , as Exhibit 4.1 to our current report on Form 8-K (File No. 001-07584) and incorporated herein by reference). 4.46 — Indenture, dated as of July 13, 2012, between Transcontinental Gas Pipe Line Company, LLC and The Bank of New York Mellon Trust Company, N.A., as Trustee (filed on July 16, 2012 , as Exhibit 4.1 to our current report Form 8-K (File No. 001-07584) and incorporated herein by reference). 4.47 — Indenture, dated as of March 15, 2018, between Transcontinental Gas Pipe Line Company, LLC and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on March 15, 2018 , as Exhibit 4.1 to our current report on Form 8-K (File No. 001-07584) and incorporated herein by reference). 4.48 — Indenture, dated as of May 8, 2020, between Transcontinental Gas Pipe Line Company, LLC and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on May 8, 2020 , as Exhibit 4.1 to our current report on Form 8-K (File No. 001-07584) and incorporated herein by reference). 209 Exhibit No. Description 4.49 — I ndenture, dated as of November 20, 2025, between Transcontinental Gas Pipe Line Company, LLC and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on November 20, 2025 , as Exhibit 4.1 to our current report on Form 8-K (File No. 001-07584) and incorpo rated herein by reference). 10.33 — Administrative Services Agreement, dated as of February 17, 2010, by and between Transco Pipeline Services LLC and Transcontinental Gas Pipe Line Company, LLC (filed on February 22, 2010 , as Exhibit 10.3 to Williams Partners L.P.’s, Form 8-K (File No. 001-32599) and incorporated herein by reference). 10.34 — Assignment Agreement dated February 13, 2013 by and between Transco Pipeline Services LLC and Williams WPC-I, LLC, effective January 1, 2013 (filed on February 27, 2013 , as Exhibit 10.2 to our annual report on Form 10-K (File No. 001-07584) and incorporated herein by reference). 10.35 — Amended and Restated Credit Agreement dated as of October 8, 2021 between The Williams Companies, Inc., Northwest Pipeline LLC, and Transcontinental Gas Pipeline Company, LLC, as co-borrowers, the lenders named therein, and Wells Fargo Bank, National Association, as Administrative Agent (filed on October 8, 2021 , as Exhibit 10.1 to The Williams Companies, Inc.’s Current Report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 23.2* — Consent of Independent Registered Public Accounting Firm, Ernst & Young LLP. 31.3* — Certification of the Principal Executive Officer pursuant to Rules 13a-l4(a) and 15d-14(a) promulgated under the Securities Exchange Act of 1934, as amended, and Item 601(b)(3l) of Regulation S-K, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. 31.4* — Certification of the Principal Financial Officer pursuant to Rules 13a-14(a) and l5d-l4(a) promulgated under the Securities Exchange Act of 1934, as amended, and Item 601(b)(31) of Regulation S-K, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. 32.2** — Certification of the Principal Executive Officer and the Principal Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. 101.INS* — XBRL 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.SCH* — XBRL Taxonomy Extension Schema. 101.CAL* — XBRL Taxonomy Extension Calculation Linkbase. 101.DEF* — XBRL Taxonomy Extension Definition Linkbase. 101.LAB* — XBRL Taxonomy Extension Label Linkbase. 101.PRE* — XBRL Taxonomy Extension Presentation Linkbase. 104* — Cover Page Interactive Data File. The cover page interactive data file does not appear in the interactive data file because its XBRL tags are embedded within the inline XBRL document (contained in Exhibit 101). ______________ * Filed herewith ** Furnished herewith 210 NWP (a) 1 and 2. Page Covered by report of independent auditors (PCAOB ID: 42 ): Statement of net income for each year in the three-year period ended December 31, 2025 108 Balance sheet at December 31, 2025 and 2024 109 Statement of changes in member’s equity for each year in the three-year period ended December 31, 2025 110 Statement of cash flows for each year in the three-year period ended December 31, 2025 111 Combined Notes to Financial Statements 112 All other schedules have been omitted since the required information is not present or is not present in amounts sufficient to require submission of the schedule, or because the information required is included in the financial statements and notes thereto. (a) 3 and (b). The exhibits listed below are filed as part of this annual report. INDEX TO EXHIBITS Exhibit No. Description 2.1 — Certificate of Conversion of Northwest Pipeline GP (filed on July 3, 2013 , as Exhibit 2.1 to our current report on Form 8-K (File No. 001-07414) and incorporated herein by reference). 3.7 — Certificate of Formation of Northwest Pipeline LLC (filed on July 3, 2013 , as Exhibit 2.2 to our current report on Form 8-K (File No. 001-07414) and incorporated herein by reference). 3.8 — Operating Agreement of Northwest Pipeline LLC (filed on July 3, 2013 , as Exhibit 3.1 to our current report on Form 8-K (File No. 001-07414) and incorporated herein by reference). 4.50 — Indenture, dated as of April 3, 2017, between Northwest Pipeline LLC and The Bank of New York Mellon Trust Company, N.A., as trustee (filed on April 3, 2017 , as Exhibit 4.1 to our current report on Form 8-K (File No. 001-07414) and incorporated herein by reference). 10.36 — Administrative Services Agreement, dated January 24, 2008, between Northwest Pipeline GP and Northwest Pipeline Services LLC (filed on January 30, 2008 , as Exhibit 10.1 to our current report on Form 8-K (File No. 001-07414) and incorporated herein by reference). 10.37 — Assignment Agreement dated February 13, 2013, by and between Northwest Pipeline Services LLC and Williams WPC-I, LLC, effective January 1, 2013 (filed on February 3, 2015 , as Exhibit 10(b) to our annual report on Form 10-K (File No. 001-07414) and incorporated herein by reference). 10.38 — Amended and Restated Credit Agreement dated as of October 8, 2021 between The Williams Companies, Inc., Northwest Pipeline LLC, and Transcontinental Gas Pipeline Company, LLC, as borrowers, the lenders named therein, and Wells Fargo Bank, National Association, as Administrative Agent (filed on October 8, 2021 , as Exhibit 10.1 to The Williams Companies, Inc.’s current report on Form 8-K (File No. 001-04174) and incorporated herein by reference). 10.39 — C redit Agreement dated as of December 1, 2025 , among Northwest Pipeline LLC, as borrower, the lenders named therein, and PNC Bank, National Association, as Administrative Agent (filed on December 1, 2025 , as Exhibit 10 .1 to The Williams Companies, Inc. ’ s current report on Form 8-K (File No. 001-07414) and incorporated her ein by reference). 23.3* — Consent of Independent Registered Public Accounting Firm, Ernst & Young LLP. 211 Exhibit No. Description 31.5* — Certification of the Principal Executive Officer pursuant to Rules 13a-l4(a) and 15d-14(a) promulgated under the Securities Exchange Act of 1934, as amended, and Item 601(b)(3l) of Regulation S-K, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. 31.6* — Certification of the Principal Financial Officer pursuant to Rules 13a-14(a) and l5d-l4(a) promulgated under the Securities Exchange Act of 1934, as amended, and Item 601(b)(31) of Regulation S-K, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. 32.3** — Certification of the Principal Executive Officer and the Principal Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. 101.INS* — XBRL 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.SCH* — XBRL Taxonomy Extension Schema. 101.CAL* — XBRL Taxonomy Extension Calculation Linkbase. 101.DEF* — XBRL Taxonomy Extension Definition Linkbase. 101.LAB* — XBRL Taxonomy Extension Label Linkbase. 101.PRE* — XBRL Taxonomy Extension Presentation Linkbase. 104* — Cover Page Interactive Data File. The cover page interactive data file does not appear in the interactive data file because its XBRL tags are embedded within the inline XBRL document (contained in Exhibit 101). ______________ * Filed herewith ** Furnished herewith 212 Item 16. Form 10-K Summary Not applicable. 213 The Williams Companies, Inc. SIGNATURES Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. T HE W ILLIAMS C OMPANIES , I NC . (Registrant) By: /s/ MARY A. HAUSMAN Mary A. Hausman Vice President, Chief Accounting Officer and Controller Date: February 24, 2026 Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. Signature Title Date /s/ CHAD J. ZAMARIN President, Chief Executive Officer and Director February 24, 2026 Chad J. Zamarin (Principal Executive Officer) /s/ JOHN D. PORTER Executive Vice President and Chief Financial Officer February 24, 2026 John D. Porter (Principal Financial Officer) /s/ MARY A. HAUSMAN Vice President, Chief Accounting Officer and Controller February 24, 2026 Mary A. Hausman (Principal Accounting Officer) /s/ ALAN S. ARMSTRONG Executive Chairman of the Board February 24, 2026 Alan S. Armstrong /s/ STEPHEN W. BERGSTROM Lead Independent Director February 24, 2026 Stephen W. Bergstrom /s/ MICHAEL A. CREEL Director February 24, 2026 Michael A. Creel /s/ STACEY H. DORÉ Director February 24, 2026 Stacey H. Doré /s/ CARRI A. LOCKHART Director February 24, 2026 Carri A. Lockhart /s/ RICHARD E. MUNCRIEF Director February 24, 2026 Richard E. Muncrief /s/ PETER A. RAGAUSS Director February 24, 2026 Peter A. Ragauss 214 Signature Title Date /s/ ROSE M. ROBESON Director February 24, 2026 Rose M. Robeson /s/ SCOTT D. SHEFFIELD Director February 24, 2026 Scott D. Sheffield /s/ WILLIAM H. SPENCE Director February 24, 2026 William H. Spence /s/ JESSE J. TYSON Director February 24, 2026 Jesse J. Tyson 215 Transcontinental Gas Pipe Line Company, LLC SIGNATURES Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. T RANSCONTINENTAL G AS P IPE L INE C OMPANY , LLC (Registrant) By: /s/ BILLEIGH W. MARK Billeigh W. Mark Controller Date: February 24, 2026 Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. Signature Title Date /s/ CHAD A. TEPLY Management Committee Member and Senior Vice President February 24, 2026 Chad A. Teply (Principal Executive Officer) /s/ MARY A. HAUSMAN Vice President and Chief Accounting Officer February 24, 2026 Mary A. Hausman (Principal Financial Officer) /s/ BILLEIGH W. MARK Controller February 24, 2026 Billeigh W. Mark (Principal Accounting Officer) 216 Northwest Pipeline LLC SIGNATURES Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. N ORTHWEST P IPELINE LLC (Registrant) By: /s/ BILLEIGH W. MARK Billeigh W. Mark Controller Date: February 24, 2026 Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. Signature Title Date /s/ CHAD A. TEPLY Management Committee Member and Senior Vice President February 24, 2026 Chad A. Teply (Principal Executive Officer) /s/ MARY A. HAUSMAN Vice President and Chief Accounting Officer February 24, 2026 Mary A. Hausman (Principal Financial Officer) /s/ BILLEIGH W. MARK Controller February 24, 2026 Billeigh W. Mark (Principal Accounting Officer) 217