Southside Bancshares Inc. has filed a prospectus with the U.S. Securities and Exchange Commission for the issuance and sale of $150 million in 7.00% Fixed-to-Floating Rate Subordinated Notes due 2035. The offering is part of the company's registration statement on Form S-3, originally filed on April 28, 2023. The final prospectus supplement was submitted on August 8, 2025, following a preliminary version filed a day earlier. The underwriting agreement, involving Southside Bank and Keefe, Bruyette & Woods, Inc. as the representative of the underwriters, includes standard representations, warranties, and conditions to closing. The transaction is anticipated to close on or around August 14, 2025, pending customary closing conditions.