Dr. Kirk A. Calhoun Elected to Southside Bancshares, Inc. Board of Directors

TYLER, Texas – May 15, 2024 – Southside Bancshares, Inc. (the “Company”) (NASDAQ: SBSI), the holding company of Southside Bank (the “Bank”), announced the election of Dr. Kirk A. Calhoun to the Company’s board of directors on May 15, 2024. Dr. Calhoun was also appointed to the Bank’s board of directors, effective May 15, 2024.

Dr. Calhoun has served a combined 22 years as the president of The University of Texas (UT) at Tyler and The University of Texas Health Science Center at Tyler (UTHSCT). He plans to retire effective May 31, 2024. Calhoun led UT Tyler since the university merged with UTHSCT in 2021. He began his presidency of UTHSCT in 2002, making him the longest serving acting president in the UT System.

Calhoun first began his medical career in Internal Medicine and Nephrology private practice and subsequently pursued his passion in academic medicine. Over his 40-year career in the field, he has held many different roles including Corporate Medical Director of UT Medical Branch at Galveston HealthCare Systems, Senior Vice President of Parkland Hospital, the Associate Dean of Clinical Affairs at the UT Southwestern Medical School, and is subsequently serving as President of UT Tyler and UTHSCT.

Dr. Calhoun serves as Chair of the UT Health East Texas Board of Directors, is on the executive committee of Teaching Hospitals of Texas, and is the immediate Past Chair of the American Association of Medical Colleges Board of Directors. Throughout his many years of service in the medical community, Dr. Calhoun has received numerous awards for his work and leadership in healthcare, public health, higher education, and community service, including the T.B. Butler Citizen of the Year Award and was an inductee to the prestigious Doctor Luke Society in 2021. In 2023, Calhoun was awarded the Chief Executive Leadership Award from The Council for Advancement and Support of Education District IV.

“We are proud to welcome Dr. Calhoun to Southside's boards,” said Lee R. Gibson, President and Chief Executive Officer of Southside. “He has led UT Tyler and UT Health Science Center through extraordinary change and growth and is well-respected across the state. Dr. Calhoun is a true visionary and I have no doubt he will bring great contributions and depth to Southside’s boards. We look forward to the impact his contributions will have on the Bank, our communities, clients, customers, and shareholders.”

About Southside Bank

Southside Bank is headquartered in Tyler, Texas, with approximately $8.35 billion in assets as of March 31, 2024. Southside currently operates 54 branches, one loan production office, and a network of 73 ATMs/ITMs throughout East Texas, Southeast Texas, and the greater Dallas/Fort Worth, Austin, and Houston areas. Additionally, Southside is affiliated with over 60,000 ATMS across the nation. 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.