SEACOAST BANKING CORP OF FLORIDA

(a)Evaluation of Disclosure Controls and Procedures

The Company maintains disclosure controls and procedures that are designed to ensure that information required to be disclosed in the reports under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to management, including the Company's Chief Executive Officer (“CEO”) and Chief Financial Officer (“CFO”), as appropriate, to allow timely decisions regarding required disclosure. In designing and evaluating disclosure controls and procedures, as defined in SEC Rule 13a-15 under the Exchange Act, management recognized that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives.

In connection with the preparation of this Annual Report on Form 10-K, as of the end of the period covered by this report, an evaluation was performed, with the participation of the CEO and CFO, of the effectiveness of the Company's disclosure controls and procedures, as required by Rule 13a-15 of the Exchange Act. Based upon that evaluation, the CEO and CFO concluded that the disclosure controls and procedures were effective as of the end of the period covered by this report.

(b)Management’s Report on Internal Control over Financial Reporting

Management is responsible for establishing and maintaining adequate internal control over financial reporting for the Company. Our internal control system was designed to provide reasonable assurance to management and the board of directors regarding the reliability of financial reporting and the preparation of financial statements for external purposes.

Management conducted an assessment of the effectiveness of our internal control over financial reporting as of December 31, 2023. This assessment was based on the criteria set forth by the Committee of Sponsoring Organizations of the Treadway

Commission in Internal Control—Integrated Framework 2013. Based on this assessment, management believes that, as of December 31, 2023, the Company's internal control over financial reporting was effective.

The Company's independent registered public accounting firm, Crowe LLP, has issued an audit report on our internal control over financial reporting which is included herein.

(c)Change in Internal Control Over Financial Reporting

During the three months ended December 31, 2023, there were no changes in the internal control over financial reporting that occurred or that have materially affected, or are reasonably likely to materially affect, the internal control over financial reporting.