Investar Holding (ISTR) S-4/A Registration of securities issued in business combination transactions (amended)

Exhibit 23.2

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement on Form S-4 of Investar Holding Corporation, as amended, of our report dated March 9, 2017 relating to the consolidated financial statements appearing in the Annual Report on Form 10-K of Investar Holding Corporation for the year ended December 31, 2016, and to the reference to us under the heading “Experts” in the related proxy statement/prospectus.

/s/ Postlethwaite & Netterville, APAC

Baton Rouge, Louisiana

December 17, 2018