October 5, 2016 Dear Shareholder,

I am pleased to inform you that the Board of Directors of Origin Bancorp, Inc. has authorized a Dear Shareholder, two-for-one split of the common of the . Our decision to split the stock reaffirms our commitment to building shareholder value. I am pleased to inform you that the Board of Directors of Origin Bancorp, Inc. has authorized a two-for-one split of the of the corporation. Our decision to split the stock For each of stock held as of September 28, 2016, you will receive one additional share. To reaffirms our commitment to building shareholder value. use the latest technologies to serve you better, the additional shares are being issued in “book- entry” form, without stock certificates. Your new shares are being registered on the books of the For each share of stock held as of September 28, 2016, you will receive one additional share. To Corporation maintained by Wells Fargo Shareowner Services, our transfer agent and registrar. You use the latest technologies to serve you better, the additional shares are being issued in “book- will not receive a stock certificate unless you request it. entry” form, without stock certificates. Your new shares are being registered on the books of the

Corporation maintained by Wells Fargo Shareowner Services, our transfer agent and registrar. You The stock certificates you presently hold are still valid and should not be destroyed or exchanged. will not receive a stock certificate unless you request it. Such certificates will continue to represent the same number of shares as shown on their face and should be kept in a secure place, such as a safe deposit box. The stock certificates you presently hold are still valid and should not be destroyed or exchanged.

Such certificates will continue to represent the same number of shares as shown on their face and The two-for-one stock split will not change your percentage of in the Corporation and should be kept in a secure place, such as a safe deposit box. in and of itself will not be subject to United States federal income tax. For tax purposes, the cost basis of each new share and each share of common stock you presently own will be equal to one- The two-for-one stock split will not change your percentage of ownership in the Corporation and half of the cost basis of the corresponding share immediately prior to the split. You should in and of itself will not be subject to United States federal income tax. For tax purposes, the cost consult your tax advisor with any tax questions you may have regarding the split. basis of each new share and each share of common stock you presently own will be equal to one- half of the cost basis of the corresponding share immediately prior to the split. You should General information on the book-entry form of ownership appears on the following statement. If consult your tax advisor with any tax questions you may have regarding the split. you have any questions about the enclosed statement, the stock split or your current certificates, or if you would like to receive a certificate for the stock split shares, you may contact Jeannine General information on the book-entry form of ownership appears on the following statement. If Coker, Vice President, Board Administration and Shareholder Services of Origin Bancorp, Inc., at you have any questions about the enclosed statement, the stock split or your current certificates, 318-232-7492. or if you would like to receive a certificate for the stock split shares, you may contact Jeannine

Coker, Vice President, Board Administration and Shareholder Services of Origin Bancorp, Inc., at Thank you for your investment in Origin Bancorp, Inc. We remain focused on our strategic plan 318-232-7492. and our commitment to our shareholders, customers, employees and communities.

Thank you for your investment in Origin Bancorp, Inc. We remain focused on our strategic plan and our commitment to our shareholders, customers, employees and communities. Sincerely,

Sincerely,

Drake Mills

Chairman of the Board

Origin Bancorp, Inc. Drake Mills Chairman of the Board Origin Bancorp, Inc.

15111511 North TrentonTrenton u Ruston, LALA 71270 71270 u Office:Office: 318.232.7492 318.232.7492 u Fax: 318.254.7432

1511 North Trenton Ruston, LA 71270 Office: 318.232.7492 Fax: 318.254.7432