Trustmark Corporation has entered into a material definitive agreement to issue and sell $175 million in aggregate principal amount of 6.00% Fixed-to-Floating Rate Subordinated Notes due 2035. The transaction was executed under an underwriting agreement with Keefe, Bruyette & Woods and Goldman Sachs & Co. LLC as underwriters. The notes will be sold at a 1.1% underwriting discount, resulting in net proceeds of approximately $173.1 million before offering expenses. Trustmark plans to use the proceeds to repay $125 million of its outstanding 3.625% Fixed-to-Floating Rate Subordinated Notes due 2030, plus accrued interest, and for general corporate purposes. The offering is expected to close on November 20, 2025, subject to customary closing conditions.