0001437749-23-030006 4 1 20230731 20231102 20231102 Nelson Andrew C 0001611476 4 34 001-36522 231372439 3235 MCCONNELL DRIVE BATON ROUGE LA 70809 Investar Holding Corp 0001602658 6022 271560715 LA 1231 10500 COURSEY BLVD THIRD FLOOR BATON ROUGE LA 70816 225-227-2222 10500 COURSEY BLVD THIRD FLOOR BATON ROUGE LA 70816 4 1 rdgdoc.xml NELSON FORM 4 X0508 4 2023-07-31 0001602658 Investar Holding Corp ISTR 0001611476 Nelson Andrew C C/O INVESTAR HOLDING CORPORATION 10500 COURSEY BLVD. BATON ROUGE LA 70816 1 0 Common Stock 2023-07-31 4 L 0 392 15.08 A 136424 D Common Stock 2023-07-31 4 L 0 55 15.08 A 8341 I By AJ Investment Co LLC Common Stock 2023-10-31 4 L 0 612 9.67 A 137036 D Common Stock 2023-10-31 4 L 0 86 9.67 A 8427 I By AJ Investment Co LLC Common Stock 2023-11-01 4 P 0 3000 9.87 A 140036 D Reflects shares acquired by the Reporting Person under an automatic dividend reinvestment plan. Reporting of this acquisition was deferred under Rule 16a-6(a); however, because of the Reporting Person's purchase of shares on October 31, 2023, the reporting of the acquisition is no longer deferred and is being reported on this Form 4 in accordance with Rule 16a-6(b). As of October 31, 2023, common stock purchases for the Reporting Person through an automatic dividend reinvestment plan have exceeded the aggregated small acquisition market value of $10,000, as set forth in Rule 16a-6, and are therefore being reported prior to a Form 5 filing. Mr. Nelson holds an aggregate 90% equity interest in AJ Investment Co LLC. AJ Investment Co LLC is the direct owner of 8,427 shares of Common Stock. Mr. Nelson disclaims beneficial ownership of the shares of Common Stock directly owned by AJ Investment Co LLC for purposes of Section 16, except to the extent of his pecuniary interest in approximately 7,585 shares. /s/ Andrew C. Nelson, M.D 2023-11-02