X0407 4 2023-05-08 0001624322 Business First Bancshares, Inc. BFST 0001811639 Johnson Joseph Vernon 500 LAUREL STREET, SUITE 101 BATON ROUGE LA 70801 1 0 COMMON STOCK 2023-05-08 5 P 0 500 14.19 A 225798 D COMMON STOCK 2023-05-08 4 A 0 1584 15.78 A 227382 D COMMON STOCK 54848 I By Robert Barrett Johnson Trust COMMON STOCK 54848 I By Eric Paul Johnson Trust 2004 Reflects the grant of restricted stock to reporting person. The restricted stock fully vests on May 8, 2024. Includes (a) 1,182 shares of restricted stock granted on June 23, 2022, which vest on the earlier of June 22, 2023 or the day immediately prior to the next annual meeting of shareholders following the grant, and (b) 1,584 shares restricted stock granted on May 8, 2023, which vest on May 8, 2024. /s/ Heather Roemer, as attorney-in-fact for J. Vernon Johnson 2023-05-09