X0609 4 2026-03-31 0001624322 Business First Bancshares, Inc. BFST 0001889385 Strong Saundra false 500 LAUREL STREET, SUITE 101 BATON ROUGE LA 70801 1 EVP & General Counsel 0 COMMON STOCK 2026-03-31 4 F 0 1204 27.04 D 5878 D Restricted Stock Units 0.0000 Common Stock 9377 9377 D Includes: (a) 2,584 time-based restricted stock units granted to the reporting person on December 12, 2024, which will vest in two substantially equal installments on the second and third anniversary of the issuance date; (b) 2,714 time-based restricted stock units granted to the reporting person on March 1, 2025, which will vest in two substantially equal installments on the second and third anniversary of the issuance date; (c) 815 time-based restricted stock units granted to the reporting person on March 2, 2026, which will vest in three substantially equal installments on the first, second, and third anniversary of the issuance date; and (d) 3,264 time-based restricted stock units, which will vest in three substantially equal installments on the first, second, and third anniversary of the issuance date. /s/ Heather Roemer, as attorney-in-fact for Saundra Strong 2026-04-02