TRUSTMARK CORP

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. __)

Check the appropriate box:

Trustmark Corporation

(Name of Registrant as Specified in Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than Registrant)

Payment of Filing Fee (Check the appropriate box):

Notice of Annual Meeting of Shareholders

The 2024 Annual Meeting of Shareholders of Trustmark Corporation (Trustmark) will be held as follows:

DATE AND TIME Tuesday, April 23, 2024, at 1:00 p.m. CT LOCATION Trustmark Corporate Office 248 East Capitol Street Jackson, Mississippi 39201 ITEMS OF BUSINESS 1) To elect a board of 11 directors to hold office for the ensuing year or until their successors are elected and qualified. 2) To provide advisory approval of Trustmark’s executive compensation. 3) To approve the Trustmark Corporation Stock and Incentive Compensation Plan. 4) To ratify the selection of Crowe LLP as Trustmark’s independent auditor for the fiscal year ending December 31, 2024. 5) To transact such other business as may properly come before the meeting.

RECORD DATE

Shareholders of record on March 1, 2024, are entitled to notice of and to vote at the Annual Meeting.

PROXY VOTING/REVOCATION

Your vote is important. You are urged to vote your shares as soon as possible, whether or not you plan to attend the meeting. Please vote your shares in one of the following ways:

If you attend the meeting, you may revoke your proxy prior to the voting thereof. You may also revoke your proxy by following the instructions on page 5 of the proxy statement.

Granville Tate, Jr.

Secretary

March 13, 2024

Trustmark Corporation P. O. Box 291 Jackson, Mississippi 39205

March 13, 2024

Dear Shareholder:

On behalf of your Board of Directors, we cordially invite you to attend Trustmark’s Annual Shareholders’ Meeting at Trustmark’s Corporate Office, 248 East Capitol Street, Jackson, Mississippi 39201, on April 23, 2024, at 1:00 p.m. CT. At the meeting, you will have the opportunity to elect 11 directors who bring diverse perspectives and valuable leadership skills to Trustmark. Their guidance will enable us to successfully compete in an evolving industry and continue our steadfast commitment to the customers, associates, shareholders, and communities we have the privilege of serving. Your vote is important to us. The proposals to be considered are described in this proxy statement, and instructions on how to vote your shares may be found on page 5. We encourage you to vote your shares in advance of the meeting to ensure the presence of a quorum.

We continued to make significant progress across the organization during the year. Our performance reflected solid loan production and credit quality, and continued deposit growth in an increasingly competitive marketplace. We achieved double-digit growth in net interest income in 2023 while noninterest income continued to expand thanks in part to another record year in our insurance business and commendable results in our banking, mortgage banking and wealth management businesses. We have a tremendous team of associates focused on expanding customer relationships and demonstrating the value Trustmark can provide as their trusted financial partner. Looking forward, we will continue to pursue opportunities to further leverage investments in technology that will broaden our reach, enhance the customer experience, and improve efficiency. We remain focused on providing the financial services and advice our customers have come to expect while building long-term value for our shareholders.

We invite you to review our Form 10-K and our 2023 Year in Review, both of which are available at investorrelations.trustmark.com or in hard copy upon request. These documents will provide more detailed information about your company.

Thank you for your continued support of Trustmark and your participation in this important process.

Sincerely,