X0407 4 2023-05-02 0001624322 Business First Bancshares, Inc. BFST 0001811427 Day Rick D. 500 LAUREL STREET, SUITE 101 BATON ROUGE LA 70801 1 0 COMMON STOCK 2023-05-02 4 P 0 6000 15.26 A 254752 D Includes 1,182 shares of unvested restricted stock gratned on June 23, 2022, which will vest on the earlier of (a) June 22, 2023, or (b) the day immediately prior to the next annual meeting of shareholders following the grant. /s/ Heather Roemer, as attorney-in-fact for Ricky D. Day 2023-05-05