SIMMONS FIRST NATIONAL CORP

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Stockholders, Board of Directors and Audit Committee

Pine Bluff, Arkansas

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated balance sheets of Simmons First National Corporation (the “Company”) as of December 31, 2024 and 2023, the related consolidated statements of income, comprehensive income, stockholders’ equity and cash flows for each of the years in the three-year period ended December 31, 2024, and the related notes (“financial statements”). In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the years in the three-year period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the Company’s internal control over financial reporting 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) and our report dated February 27, 2025, expressed an unqualified opinion thereon.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits.

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 audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures include examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matters

The critical audit matters communicated below are matters arising from the current-period audit of the financial statements that were communicated or required to be communicated to the audit committee and that: (1) relate to accounts or disclosures that are material to the financial statements and (2) involved especially challenging, subjective or complex judgments.

The communication of critical audit matters does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing separate opinions on the critical audit matters or on the accounts or disclosures to which they relate.

The Company’s loan portfolio totaled $17.01 billion as of December 31, 2024 and the allowance for credit losses on loans was $235.0 million. As more fully described in Notes 1 and 4 to the Company’s consolidated financial statements, for loans receivable, the Allowance for Credit Loss (ACL) is a contra-asset valuation account, calculated in accordance with Topic 326 that is deducted from the amortized cost basis of loans to present the net amount expected to be collected.

The amount of each allowance account represents management’s best estimate of current expected credit losses on those financial instruments considering all available information from internal and external sources, relevant to assessing exposure to credit loss over the contractual term of the instrument. Loans with similar risk characteristics are aggregated into homogenous segments for assessment. Expected credit losses are estimated by either lifetime loss rates or expected cash flows based on three key parameters: probability of default (PD), exposure-at-default (EAD) or loss given default (LGD). The estimates include economic forecasts over the reasonable and supportable forecast period based on projected performance of economic variables that have a statistical relationship.

Management qualitatively adjusts its model results for risk factors that were not considered within the modeling processes but were still relevant in assessing the expected credit losses within the loan pools. In some cases, management determined that an individual loan exhibited unique characteristics which differentiated the loan from other loans with the identified loan pools. In such cases the loans were evaluated for expected credit losses on an individual basis and excluded from the collective evaluation.

Auditing management’s estimate of the ACL involved a high degree of subjectivity due to management’s identification and measurement of the qualitative factor adjustments being highly judgmental.

The primary procedures we performed as of December 31, 2024 to address this critical audit matter included:

•Obtained an understanding of the Company’s process for establishing the qualitative adjustment.

•Evaluated and tested the design and operating effectiveness of controls over the establishment of qualitative factors.

•Evaluated the qualitative adjustments to the ACL including assessing the basis for adjustments and the reasonableness of the significant assumptions.

•Evaluated credit quality trends in delinquencies, non-accruals and charge-offs.

Goodwill

As reflected in the Company’s consolidated financial statements at December 31, 2024, the Company’s goodwill was $1.32 billion. As disclosed in Note 7 to the consolidated financial statements, goodwill is tested for impairment at least annually or more frequently if indicators of impairment require the performance of an interim impairment assessment.

Auditing management’s impairment tests of goodwill was complex and highly judgmental due to the calculation relying on several assumptions that have a level of subjectivity and judgment. These assumptions are dependent on market and economic conditions. Key inputs to estimate terminal fair value of the Company include projected forecasts, noninterest expense savings and a pricing multiple based on a group of peer banks with similar characteristics.

We obtained an understanding, evaluated the design and operating effectiveness of controls over the Company’s goodwill assessment process. For example, we tested the controls over the Company’s review of the significant assumptions utilized in estimating the fair value of the reporting unit.

To test the fair values of the reporting unit, our audit procedures included, among others, assessing methodologies, testing the significant assumptions described above, and testing the completeness and accuracy of the underlying data used by the Company. Our testing procedures over the significant assumptions included, among others, comparing forecasted revenue to current industry and economic trends. We assessed the historical accuracy of management’s estimates by comparing past projections to actual performance and assessed the sensitivity analyses of significant assumptions to evaluate the changes in the fair value of the reporting unit resulting from changes in the assumptions. We also involved an internal valuation professional to assist in evaluating the Company’s models, valuation methodology, and significant assumptions used in the fair value estimates.

Forvis Mazars, LLP

/s/ Forvis Mazars, LLP

We have served as the Company’s auditor since 1972.

Little Rock, Arkansas

February 27, 2025