X0202 SCHEDULE 13G/A 0001770100-25-000013 0001770100 XXXXXXXX LIVE 8 Common stock, no par value per share 03/31/2026 0001071236 Red River Bancshares, Inc. 75686R202 1412 Centre Court Drive Suite 301 Alexandria LA 71301 Rule 13d-1(c) Simeon A. Thibeaux LA 337812.00 66411.00 337812.00 66411.00 404223.00 N 6.2 IN Shares identified as subject to sole voting power (line 5) and sole dispositive power (line 7) consist of 170,573 shares of Common Stock held of record by the John Charles Simpson Jr. Trust ("JCSJ Trust") and 167,239 shares of Common Stock held of record by the Angela Katherine Simpson Trust ("AKS Trust"). The Reporting Person is the sole trustee of each of the JCSJ Trust and the AKS Trust. Shares identified as subject to shared voting power (line 6) and shared dispositive power (line 8) are held by S3 Dynamics, L.P. The sole general partner of S3 Dynamics, L.P. is S3 Management, L.L.C., which has management authority over S3 Dynamics, L.P., and Mr. Thibeaux is one of three managers of S3 Management, L.L.C. Mr. Thibeaux is also the trustee or an investment advisor of trusts owning 100% of the limited partnership interests in S3 Dynamics, L.P. Red River Bancshares, Inc. 1412 Centre Court Drive, Suite 301, Alexandria, Louisiana, 71301 Simeon A. Thibeaux 1412 Centre Court Drive, Suite 301, Alexandria, LA 71301 State of Louisiana Y 404,223 6.2 337,812. Consists of 170,573 shares of Common Stock held of record by the John Charles Simpson Jr. Trust ("JCSJ Trust") and 167,239 shares of Common Stock held of record by the Angela Katherine Simpson Trust ("AKS Trust"). The Reporting Person is the sole trustee of each of the JCSJ Trust and the AKS Trust. 66,411. Shares are held by S3 Dynamics, L.P. The sole general partner of S3 Dynamics, L.P. is S3 Management, L.L.C., which has management authority over S3 Dynamics, L.P., and Mr. Thibeaux is one of three managers of S3 Management, L.L.C. Mr. Thibeaux is also the trustee or an investment advisor of trusts owning 100% of the limited partnership interests in S3 Dynamics, L.P. 337,812. Consists of 170,573 shares of Common Stock held of record by the JCSJ Trust and 167,239 shares of Common Stock held of record by the AKS Trust. The Reporting Person is the sole trustee of each of the JCSJ Trust and the AKS Trust. 66,411. Shares are held by S3 Dynamics, L.P. The sole general partner of S3 Dynamics, L.P. is S3 Management, L.L.C., which has management authority over S3 Dynamics, L.P., and Mr. Thibeaux is one of three managers of S3 Management, L.L.C. Mr. Thibeaux is also the trustee or an investment advisor of trusts owning 100% of the limited partnership interests in S3 Dynamics, L.P. Y N Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. Simeon A. Thibeaux /s/ Simeon A. Thibeaux Simeon A. Thibeaux 04/22/2026