0001437749-24-010939 4 1 20240401 20240403 20240403 Campbell John R 0001964039 4 34 001-36522 24820624 10500 COURSEY BOULEVARD BATON ROUGE LA 70816 Investar Holding Corp 0001602658 6022 02 Finance 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 CAMPBELL FORM 4 X0508 4 2024-04-01 0001602658 Investar Holding Corp ISTR 0001964039 Campbell John R C/O INVESTAR HOLDING CORPORATION 10500 COURSEY BLVD. BATON ROUGE LA 70816 1 Chief Financial Officer 0 Common Stock 2024-04-01 4 A 0 5622 0 A 11042 D Employee Stock Options 16.35 2024-04-01 4 A 0 10145 0 A 2025-04-01 2034-04-01 Common Stock 10145 10145 D Grant of restricted stock units that convert into common stock on a one-for-one basis. Vesting occurs in equal increments on the anniversary dates for the following five years. One-fifth of the options are exercisable on the date indicated and on each of the next four anniversaries thereof. /s/ John R. Campbell 2024-04-03