X0508 4/A 2024-12-12 2024-12-16 0001624322 Business First Bancshares, Inc. BFST 0002021584 Carter Donald Chad 500 LAUREL STREET, SUITE 101 BATON ROUGE LA 70801 1 EVP, Correspondent Banking 0 COMMON STOCK 17223 D Restricted Stock Units 0 2024-12-12 4 A 0 3856 0 A Common Stock 3856 3856 D No transaction is being reported at this time. This line is only reporting holdings as of December 16, 2024. Includes units of employer stock fund through issuer's 401(k) plan equivalent to 6,799 shares of common stock. Includes 3,068 shares of unvested restricted stock granted on 2/1/2024, of which 1,912 shares will vest on 3/31/2025 and the remaining 1,156 shares will vest on 3/31/2026. Under the terms of the relevant restricted stock grants, the reported shares of unvested restricted stock are subject to forfeiture upon the occurrence of certain events. The original Form 4, filed on December 16, 2024, incorrectly reported the grant of the reported securities as an acquisition of shares of restricted stock under Table I. This amendment is being filed to correct the original report by reporting the grant of the reported securities as an acquisition of restricted stock units under Table II. Reflects the grant of 3,856 time-based restricted stock units granted to the reporting person under the Business First Bancshares, Inc. 2024 Equity Incentive Plan on December 12, 2024. The time-based restricted stock units will vest in three substantially equal installments on the first, second and third anniversary of the issuance date. 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 Donald Chad Carter 2025-03-19