X0306 4 2022-03-31 0001624322 Business First Bancshares, Inc. BFST 0001734795 MELVILLE DAVID R. III 500 LAUREL STREET, SUITE 101 BATON ROUGE LA 70801 1 1 President and CEO Common Stock 2022-03-31 4 F 0 6761 24.33 D 181839 D Includes (a) 9,683 shares of unvested restricted stock granted on 2/1/2021, which will vest on 3/31/2023, and (b) 16,430 shares of unvested restricted stock granted on 2/1/2022, of which 8,214 shares will vest on 3/31/2023 and the remaining 8,216 shares will vest on 3/31/2024. Under the terms of the relevant restricted stock grants, the reported shares of unvested restricted stock are subject to forfeiture upon the occurrence of certain events. Includes units of employer stock fund through issuer's 401(k) plan equivalent to approximately 5,865 shares. /s/ Heather Roemer, as attorney-in-fact for David R. Melville III 2022-04-04