Summit Midstream Corp

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures as of the end of the period covered by this report. Our disclosure controls and procedures have been designed to provide reasonable assurance that the information required to be disclosed in the reports we file or submit under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, to allow timely decisions regarding required disclosures. Based on management’s evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) were effective at the reasonable assurance level as of September 30, 2026.

Changes in Internal Control over Financial Reporting

During the third quarter of 2026, we implemented a new enterprise resource planning (“ERP”) system covering our financial reporting, procurement, and revenue processes. In connection with this implementation, we modified certain existing internal controls over financial reporting and implemented new controls and procedures to reflect changes in our business processes and systems. While we expect the new ERP system to enhance our internal control environment, we will continue to evaluate and monitor the design and effectiveness of these control changes.

Other than the changes discussed above related to the new ERP system implementation, there have been no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the quarter ended September 30, 2026 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.