Summit Midstream Corp

Disclosure Controls and Procedures

We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed by us in the reports that we file or submit to the Securities and Exchange Commission under the Exchange Act, is recorded, processed, summarized and reported within the time periods specified by the SEC’s rules and forms, and that information is accumulated and communicated to the management of the Company, including our Company’s principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. The Company’s management has evaluated the effectiveness of its disclosure controls and procedures (as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of the end of the period covered by this annual report (the “Evaluation Date”). Based on such evaluation, the Chief Executive Officer and Chief Financial Officer of the Company have concluded that, as of the Evaluation Date, the Company’s disclosure controls and procedures are effective.

Changes in Internal Control Over Financial Reporting

During the quarter ended December 31, 2024, the Company completed the Tall Oak Acquisition. As part of the ongoing integration of the acquired business, we are in the process of incorporating the controls and related procedures of the Tall Oak Acquisition. Other than incorporating the Tall Oak Acquisition controls and the annual income tax accounting controls discussed below, there have not been any changes in the Company’s internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the fourth fiscal quarter of 2024 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

During the fourth fiscal quarter of 2024, we added internal control processes over financial reporting as a result of our Corporate Reorganization and resulting federal and state income tax requirements.

Management’s Annual Report on Internal Control Over Financial Reporting

Management of the Company is responsible for establishing and maintaining adequate internal control over financial reporting. An evaluation of the effectiveness of our internal control over financial reporting was conducted as of December 31, 2024, based on the framework and criteria established in Internal Control - Integrated Framework (2013)issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management has concluded that our internal control over financial reporting was effective as of December 31, 2024.

Management’s assessment and conclusion on the effectiveness of the Company’s internal control over financial reporting as of December 31, 2024 excludes an assessment of the internal control over financial reporting of the Tall Oak Acquisition, which was acquired on December 2, 2024. The Tall Oak Acquisition represented approximately 20% of our consolidated total assets as of December 31, 2024 and 2% of our consolidated revenues for the fiscal year ended December 31, 2024.

Our independent registered public accounting firm has issued an audit report on our internal control over financial reporting, included below this report.

/s/ J. HEATH DENEKE

J. Heath Deneke

President and Chief Executive Officer, Summit Midstream Corporation

/s/ WILLIAM J. MAULT

William J. Mault

Executive Vice President and Chief Financial Officer, Summit Midstream Corporation

To the stockholders and the Board of Directors of Summit Midstream Corporation

Opinion on Internal Control over Financial Reporting

We have audited the internal control over financial reporting of Summit Midstream Corporation and subsidiaries (the "Company") as of December 31, 2024, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control — Integrated Framework (2013) issued by COSO.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated financial statements as of and for the year ended December 31, 2024, of the Company and our report dated March 11, 2025, expressed an unqualified opinion on those financial statements based on our audit.

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.

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/ Deloitte & Touche LLP

Houston, Texas

March 11, 2025