Trustmark Corporation

Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. Appointment of Chief Operating Officer of the Bank The Board of Directors of Trustmark Bank (the Bank), a wholly owned subsidiary of Trustmark Corporation (Trustmark), appointed Thomas C. Owens, 62, to serve as Chief Operating Officer of the Bank, effective May 1, 2026. Mr. Owens currently serves as Treasurer and Principal Financial Officer of Trustmark and Chief Financial Officer of the Bank. Mr. Owens has more than 38 years of experience and has been Treasurer and Principal Financial Officer of Trustmark and Chief Financial Officer of the Bank since 2021. He has also served as Executive Vice President and Treasurer of the Bank. As of the date of this Current Report on Form 8-K, neither Mr. Owens nor any of his immediate family members is a party, either directly or indirectly, to any transaction that would be required to be reported under Item 404(a) of Regulation S-K, nor is Mr. Owens a party to any understanding or arrangement pursuant to which he was selected to serve as Executive Vice President, Chief Operating Officer of the Bank. In connection with Mr. Owens’ appointment as Chief Operating Officer of the Bank and his increased responsibilities in such role, he will be granted a one-time award of time-based restricted stock units with an aggregate value of $150,000 in May, 2026, vesting in three years. Mr. Owens’ salary will be $550,000 effective May 1, 2026. His bonus (short term incentive) opportunity linked to 2026 performance is targeted at 70% of salary. His equity award (long term incentive) level for the 2026 grant will be targeted at a value of $400,000. Appointment of Executive Vice President, Chief Financial Officer of the Bank and Treasurer and Principal Financial Officer of Trustmark The Board of Directors of Trustmark appointed Joseph E. Bond, 63, to serve as Treasurer and Principal Financial Officer of Trustmark, and the Board of Directors of the Bank appointed Mr. Bond to serve as Executive Vice President, Chief Financial Officer of the Bank, in each case effective May 1, 2026. Mr. Bond has 40 years of experience and has been Corporate Treasurer of Texas Capital Bancshares, Inc., in Dallas, TX, since 2022 and Executive Vice President and Director of Corporate Treasury since 2021. Mr. Bond has previous experience with BBVA USA in Birmingham, AL, serving as Executive Vice President and Asset Liability Manager as well as with Webster Bank in Waterbury, CT as Senior Vice President, Investment Portfolio and Funding Manager, and with Huntington Bancshares in Columbus, OH. He began his career with MNC Financial in Washington, DC in 1986. As of the date of this Current Report on Form 8-K, neither Mr. Bond nor any of his immediate family members is a party, either directly or indirectly, to any transaction that would be required to be reported under Item 404(a) of Regulation S-K, nor is Mr. Bond a party to any understanding or arrangement pursuant to which he was selected to serve as Treasurer and Principal Financial Officer of Trustmark and Executive Vice President, Chief Financial Officer of the Bank. In connection with Mr. Bond’s appointment as Treasurer and Principal Financial Officer of Trustmark and Executive Vice President, Chief Financial Officer of the Bank, he will be granted a one-time award of time-based restricted stock units with an aggregate value of $200,000 in May, 2026, vesting in three years. Mr. Bond’s salary will be $457,000 effective May 1, 2026. His bonus (short term incentive) opportunity linked to 2026 performance is targeted at 60% of salary. Trustmark will enter into a change in control agreement with Mr. Bond, effective as of May 1, 2026, which form of agreement is filed as Exhibit 10-ad to Trustmark’s Current Report on Form 8-K filed on February 7, 2014.

Item 8.01. Other Events. On March 30, 2026, Trustmark issued a press release announcing the executive transitions described in Item 5.02 above of this Form 8-K. A copy of the press release is attached as Exhibit 99.1 and incorporated herein by reference.