Shareholder Vote

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934   April 28, 2026 Date of Report (Date of earliest event reported) TRUSTMARK CORP ORATION (Exact name of registrant as specified in its charter)   Mississippi   000-03683   64-0471500 (State or other jurisdiction of incorporation)   (Commission File Number)   (IRS Employer Identification No.)   248 East Capitol Street , Jackson , Mississippi   39201 (Address of principal executive offices)   (Zip Code)       Registrant’s telephone number, including area code:   ( 601 ) 208-5111   Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:   ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))   Securities registered Pursuant to Section 12(b) of the Act: Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock, no par value TRMK Nasdaq Global Select Market   Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).   Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐         Item 5.07. Submission of Matters to a Vote of Security Holders. At Trustmark's Annual Meeting held on April 28, 2026, three proposals were submitted to Trustmark's shareholders, which are described in detail in Trustmark’s Proxy Statement. The final results for the votes regarding the proposals are set forth below. Proposal #1: Election of directors. Trustmark’s shareholders elected the eleven directors named below to serve until the 2027 annual shareholders’ meeting or until their successors have been elected and qualified. The votes cast for each of the eleven directors, who constitute the entire Board of Directors of Trustmark following the meeting, are set forth below:   For   Against   Abstain Broker Non-Votes   Adolphus B. Baker   43,258,696   1,277,281   35,375   6,411,097 Augustus L. Collins 43,939,841   595,237 36,274 6,411,097 Tracy T. Conerly 43,787,331 727,268 56,753 6,411,097 Duane A. Dewey 43,995,359 549,072 26,921 6,411,097 Marcelo Eduardo 43,956,034 559,147 56,171 6,411,097 J. Clay Hays, Jr., M.D. 43,998,292 546,085 26,975 6,411,097 Gerard R. Host 43,472,997 1,071,439 26,916 6,411,097 Harris V. Morrissette 44,222,089 284,058 65,205 6,411,097 Richard H. Puckett 41,629,989 2,906,094 35,269 6,411,097 Lea B. Turnipseed 44,430,372   83,874     57,106   6,411,097 William G. Yates III 43,828,639 711,947 30,766 6,411,097 Proposal #2: Advisory vote to approve executive compensation. Trustmark’s shareholders approved, on an advisory basis, the compensation of Trustmark’s executive officers as disclosed in the Proxy Statement. The votes regarding Proposal #2 were as follows:   For   Against   Abstain Broker Non-Votes 43,906,367 501,723 163,262 6,411,097 Proposal #3: Ratification of the selection of Crowe LLP. Trustmark’s shareholders ratified the selection of Crowe LLP as Trustmark’s independent auditor for the fiscal year ending December 31, 2026. The votes regarding Proposal #3 were as follows:   For   Against   Abstain Broker Non-Votes 50,305,161 582,101 95,187 —       SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.   TRUSTMARK CORPORATION BY:   /s/ Thomas C. Owens     Thomas C. Owens     Treasurer and Principal Financial Officer       DATE:   April 29, 2026