Raymond C. McKinney, CPA Elected to Southside Bancshares, Inc. Board of Directors

On October 16, 2025, the Board of Directors (the “Board”) of Southside Bancshares, Inc. (the “Company”) and Southside Bank (the “Bank”), a subsidiary of the Company, announced the appointment of Keith M. Donahoe, Jeb W. Jones, and Raymond C. McKinney, CPA, to serve as members of the boards, effective November 15, 2025. “We are honored to add such a respected and talented group of new Directors to our board,” said Lee Gibson, Southside Bank Chief Executive Officer (“CEO”). “We are looking forward to the contributions each of them will bring to Southside, our team members, our customers, and our shareholders.”

Mr. McKinney is CEO and President of the The Genecov Group, a real estate and oil & gas investment company based in Tyler, Texas, a position he has held since 2016. Prior to joining the Genecov Group in 2015, he served as a Partner at Gollob Morgan Peddy P.C., an East Texas public accounting firm.  Mr. McKinney currently serves as a member of the UT Health Tyler Board of Trustees, the UT Tyler Audit Committee and is a Past Chairman of the Tyler Economic Development Council. He is a graduate of Louisiana Tech University and a licensed Certified Public Accountant.

About Southside

Southside Bancshares, Inc., holding company of Southside Bank, is headquartered in Tyler, Texas, with approximately $8.34 billion in assets as of June 30, 2025. Southside currently operates 53 branches and a network of 70 ATMs/ITMs throughout East Texas, Southeast Texas, and the greater Dallas/Fort Worth, Austin, and Houston areas. Serving customers since 1960, Southside Bank is a community-focused financial institution that offers a full range of financial products and services to individuals and businesses.