X0609 4 2026-03-31 0001624322 Business First Bancshares, Inc. BFST 0001734775 JORDAN PHILIP false 500 LAUREL STREET, SUITE 101 BATON ROUGE LA 70801 1 EVP&CBO of b1Bank 0 COMMON STOCK 2026-03-31 4 F 0 1033 27.04 D 81008 D Restricted Stock Units 0.0000 Common Stock 13335 13335 D Includes 4,000 shares of common stock of the issuer held by the reporting person's investment retirement account and units of the employer stock fund through the issuer's 401(k) plan equivalent to approximately 14,993 shares of common stock of the issuer. Includes: (a) 3,722 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) 3,912 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; and (c) 5,701 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. /s/ Heather Roemer, as attorney-in-fact for Phillip Jordan 2026-04-02