SIERRA BANCORP

Evaluation of Disclosure Controls and Procedures

The Company’s Chief Executive Officer and its Chief Financial Officer, after evaluating the effectiveness of the Company’s disclosure controls and procedures (as defined in Exchange Act Rules 13(a)–15(e) as of the end of the period covered by this report (the “Evaluation Date”) have concluded that as of the Evaluation Date, the Company’s disclosure controls and procedures were adequate and effective to ensure that material information relating to the Company and its consolidated subsidiaries would be made known to them by others within those entities, particularly during the period in which this annual report was being prepared.

Disclosure controls and procedures are designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is accumulated and communicated to our Management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure, and that such information is recorded, processed, summarized, and reported within the time periods specified by the SEC.

Management’s Report on Internal Control over Financial Reporting

Management of the Company is responsible for the preparation, integrity, and reliability of the consolidated financial statements and related financial information contained in this annual report. The consolidated financial statements of the Company have been prepared in accordance with accounting principles generally accepted in the United States of America and, as such, include some amounts that are based on judgments and estimates of Management.

Management has established and is responsible for maintaining effective internal control over financial reporting. The Company’s internal control over financial reporting includes those policies and procedures that:

There are inherent limitations in the effectiveness of any internal control, including the possibility of human error and the circumvention or overriding of controls. Accordingly, even effective internal control can provide only reasonable assurance with respect to financial statement preparation. Further, because of changes in conditions, the effectiveness of internal control may vary over time. The system contains monitoring mechanisms, and actions are taken to correct deficiencies identified.

Management assessed the effectiveness of the Company’s internal control over financial reporting as of December 31, 2025. This assessment was based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. This assessment included controls over the preparation of regulatory financial statements in accordance with the Federal Financial Institutions Examination Council’s Instructions for Preparation of Consolidated Reports of Condition and Income, and in accordance with the Board of

Governors of the Federal Reserve System’s Instructions for Preparation of Financial Statements for Bank Holding Companies (Consolidated and Parent Company Only). Based on this assessment, Management believes that the Company maintained effective internal control over financial reporting as of December 31, 2025.

Management is responsible for compliance with the federal and state laws and regulations concerning dividend restrictions and federal laws and regulations concerning loans to insiders designated by the FDIC as safety and soundness laws and regulations. Management assessed compliance by the Company’s insured financial institution, Bank of the Sierra, with the designated laws and regulations relating to safety and soundness. Based on this assessment, Management believes that Bank of the Sierra complied, in all significant respects, with the designated laws and regulations related to safety and soundness for the year ended December 31, 2025.

Our assessment of the effectiveness of the Company’s internal control over financial reporting as of December 31, 2025, has been audited by Forvis Mazars LLP, an independent registered accounting firm, and December 31, 2024, has been audited by RSM US LLP, an independent registered public accounting firm, as stated in their reports appearing above in Item 8, Financial Statements and Supplementary Data.

Changes in Internal Control

There were no significant changes in the Company’s internal control over financial reporting or in other factors in the fourth quarter of 2025 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.