0001437749-24-001751 4 1 20240117 20240119 20240119 Nelson Andrew C 0001611476 4 34 001-36522 24546155 3235 MCCONNELL DRIVE BATON ROUGE LA 70809 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 NELSON FORM 4 X0508 4 2024-01-17 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 2024-01-17 4 A 0 1918 0 A 141954 D Common Stock 8427 I By AJ Investment Co LLC Grant of restricted stock units that convert into common stock on a one-for-one basis. Vesting occurs in equal increments on 1/17/2025 and 1/1/2026. 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 7,584 shares. /s/ Andrew C. Nelson, M.D 2024-01-19