SIMMONS FIRST NATIONAL CORP

(a) Evaluation of Disclosure Controls and Procedures. Under the supervision and with the participation of our management, including the Company’s Chief Executive Officer, Chief Financial Officer and Chief Accounting Officer, an evaluation of the effectiveness of the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e) and Rule 15d-15(e) under the Exchange Act) was carried out as of the end of the period covered by this Annual Report on Form 10-K. 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 as of the end of the period covered by this report.

(b) Changes in Internal Controls. Our management, including the Company’s Chief Executive Officer, Chief Financial Officer and Chief Accounting Officer, regularly review our disclosure controls and procedures and make changes intended to ensure the quality of our financial reporting. There were no changes in our internal control over financial reporting during the Company’s fourth quarter of its 2025 fiscal year that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

(c) Management’s Report on Internal Control Over Financial Reporting. Management’s report on internal control over financial reporting, as well as the audit report of Forvis Mazars, LLP on the Company’s internal control over financial reporting are included in Item 8, Consolidated Financial Statements and Supplementary Data, of this Annual Report on Form 10-K and are incorporated herein by this reference.