X0508 4 2025-06-26 0001624322 Business First Bancshares, Inc. BFST 0002032494 Sidi Zeenat 500 LAUREL STREET, SUITE 101 BATON ROUGE LA 70801 1 0 COMMON STOCK 658 D Restricted Stock Units 0 2025-06-26 4 A 0 1016 A Common Stock 1016 1016 D No transaction is being reported at this time. This line is only reporting holdings as of June 26, 2025. Reflects the grant of time-based restricted stock units granted to the reporting person under the Business First Bancshares, Inc. 2024 Equity Incentive Plan on June 26, 2025. The time-based restricted stock units will fully vest on June 26, 2026. Each time-based restricted stock unit is economically equivalent to one share of common stock of the issuer. Under the terms of the relevant restricted stock unit grant, the reported unvested restricted stock units are subject to forfeiture upon the occurrence of certain events. /s/ Heather Roemer, as attorney-in-fact for Zeenat Sidi 2025-06-30