X0508 4 2025-08-18 0001624322 Business First Bancshares, Inc. BFST 0001734794 MOCKLER PATRICK E. 500 LAUREL STREET, SUITE 101 BATON ROUGE LA 70801 1 0 COMMON STOCK 32142.50 D COMMON STOCK 2025-08-18 5 W 0 30888.472 0 A 30888.472 I By: Rita Gardner Mockler Estate Account Restricted Stock Units 0.0000 Common Stock 1016 1016 D Shares acquired by inheritance. Represents the holdings of the Rita Gardner Mockler Estate account, of which the reporting person is the executor. The reporting person disclaims beneficial ownership of the common stock held by the Rita Garnder Mockler Estate account except to the extent of his pecuniary interest therein. The time-based restricted stock units were granted to the reporting person on June 26, 2025 under the Business First Bancshares, Inc. 2024 Equity Incentive Plan. 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 Patrick E. Mockler 2025-08-20