/s/ HORNE LLP Baton Rouge, Louisiana March 10, 2021 REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM To the Shareholders and Board of Directors of Investar Holding Corporation Opinion on the Financial Statements We have audited the accompanying consolidated balance sheets of Investar Holding Corporation (the “Company”) as of December 31, 2020, and the related consolidated statements of income, comprehensive income, changes in shareholder’ equity, and cash flows, for the year ended December 31, 2020, and the related notes to the consolidated financial statements (collectively, referred to as the “financial statements”).