SIMMONS FIRST NATIONAL CORP

Management, under the supervision and with the participation of the Company’s Chief Executive Officer, Chief Financial Officer and Chief Accounting Officer, has reviewed and evaluated the effectiveness of the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e) or Rule 15d-15(e) under the Exchange Act) as of the end of the period covered by this report. Based upon that evaluation, the Chief Executive Officer, Chief Financial Officer and Chief Accounting Officer have concluded that the Company’s current disclosure controls and procedures were effective at the reasonable assurance levels as of the end of the period covered by this report to ensure that information required to be disclosed by the Company in reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in SEC rules and forms and that such information is accumulated and communicated to management, including the Company’s Chief Executive Officer, Chief Financial Officer and Chief Accounting Officer, as appropriate to allow timely decisions regarding required disclosure. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that the Company’s disclosure controls and procedures will detect or uncover every situation involving the failure of persons within the Company or its subsidiary to disclose material information required to be set forth in the Company’s periodic reports.

Changes in Internal Control over Financial Reporting

There were no changes in the Company’s internal controls over financial reporting during the quarter ended June 30, 2025, which materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.