First Guaranty Bancshares, Inc.

Evaluation of Disclosure Controls and Procedures

As of the end of the period covered by this report, an evaluation was carried out under the supervision and with the participation of First Guaranty's management, including its Chief Executive Officer (Principal Executive Officer) and its Chief Financial Officer (Principal Financial Officer), of the effectiveness of its disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934). Based on that evaluation, the Chief Executive Officer and the Chief Financial Officer concluded that these disclosure controls and procedures were effective.

For further information, see "Management's annual report on internal control over financial reporting" below. Other than as described below under “Remediation of Material Weakness,” there was no change in First Guaranty's internal control over financial reporting (as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934) that occurred during the quarter ended December 31, 2025, that has materially affected, or is reasonably likely to materially affect, First Guaranty's internal control over financial reporting.

Remediation of Material Weakness

As previously reported in Part I, Item 4 of our Quarterly Reports on Form 10-Q for the quarters ended June 30 and September 30, 2025, management identified a material weakness in our internal control over financial reporting. Management determined that First Guaranty did not effectively perform controls on a timely basis relating to the loan operations quality control review function for new loans originated during the period. Several remediation steps were taken which included new leadership, additional staff, and enhanced monitoring processes by the loan department leadership. Additional testing of controls was completed during the fourth quarter of 2025. First Guaranty has concluded that the material weakness has been effectively remediated as of December 31, 2025.

Management's Annual Report on Internal Control over Financial Reporting

The Management of First Guaranty Bancshares, Inc. has prepared the consolidated financial statements and other information in our Annual Report in accordance with accounting principles generally accepted in the United States of America and is responsible for its accuracy. The financial statements necessarily include amounts that are based on Management's best estimates and judgments. In meeting its responsibility, Management relies on internal accounting and related control systems. The internal control systems are designed to ensure that transactions are properly authorized and recorded in our financial records and to safeguard our assets from material loss or misuse. Such assurance cannot be absolute because of inherent limitations in any internal control system.

Management is responsible for establishing and maintaining the adequate internal control over financial reporting, as such term is defined in the Exchange Act Rules 13 – 15(f). Under the supervision and with the participation of Management, including our principal executive officer and principal financial officer, we conducted an evaluation of the effectiveness of internal control over financial reporting based on the framework in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. This section relates to Management's evaluation of internal control over financial reporting including controls over the preparation of the schedules equivalent to the basic financial statements and compliance with laws and regulations. Our evaluation included a review of the documentation of controls, evaluations of the design of the internal control system and tests of the effectiveness of internal controls.

Based on our evaluation under the framework in Internal Control – Integrated Framework, Management concluded that internal control over financial reporting was effective as of December 31, 2025.