X0508 4 2024-04-25 0001624322 Business First Bancshares, Inc. BFST 0001811639 Johnson Joseph Vernon 500 LAUREL STREET, SUITE 101 BATON ROUGE LA 70801 1 0 Common Stock 2024-04-25 4 A 0 1149 21.77 A 228531 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 April 26, 2025. Includes (a) 1,584 shares of restricted stock granted on May 8, 2023, which vest on May 8, 2024, and (b) 1,149 shares of restricted stock granted on April 25, 2024, which vest on April 26, 2025. /s/ Heather Roemer, as attorney-in-fact for J. Vernon Johnson 2024-04-29