X0508 4 2026-01-27 0001624322 Business First Bancshares, Inc. BFST 0001811427 Day Rick D. 500 LAUREL STREET, SUITE 101 BATON ROUGE LA 70801 1 0 COMMON STOCK 2026-01-27 4 P 0 1500 27.55 A 267385 D Restricted Stock Units 0.0000 Common Stock 1016 1016 D 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 Rick D. Day 2026-01-27