X0609 4 2026-08-19 0 0001516912 Origin Bancorp, Inc. OBK 0001941034 Wallace Willliam J IV false 500 SOUTH SERVICE ROAD EAST RUSTON LA 71270 0 1 0 0 Chief Financial Officer 0 Common Stock 2026-08-19 4 M 0 2226 A 19639 D Common Stock 2026-08-19 4 F 0 593 52.51 D 19046 D Common Stock 3761 I BY ISSUER RETIREMENT PLAN Restricted Stock Units 2026-08-19 4 M 0 2226 0 D Common Stock 2226 2226 D Restricted stock units convert into common stock on a one-for-one basis. Includes 851 shares of Common Stock purchased pursuant to the Origin Bancorp, Inc. 2021 Employee Stock Purchase Plan ("ESPP"), for the purchase period of June 01, 2025 to May 31, 2026. Represents the number of common stock that have been withheld by the issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of the restricted stock units and does not represent a sale. Granted on August 19, 2022, vesting ratably over five years with the first vest date of August 19, 2023. /s/ Drake Mills, as Attorney-in-Fact 2026-08-21