X0306 4 2022-08-04 0001624322 Business First Bancshares, Inc. BFST 0001852200 Ducrest John P. 500 LAUREL STREET, SUITE 101 BATON ROUGE LA 70801 1 Common Stock 2022-08-04 4 P 0 1712 23.39 A 8348 D Includes 1,182 shares of restricted stock, which fully vests 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 John P. Ducrest 2022-08-04