Reg FD Disclosure

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 October 16, 2017 Date of Report (Date of earliest event reported)     TRUSTMARK CORPORATION (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)) 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 7.01 Regulation FD Disclosure On October 16, 2017, Trustmark Corporation released the results of its annual company-run stress tests conducted in accordance with regulations of the Board of Governors of the Federal Reserve System and the Office of the Comptroller of the Currency under the Dodd-Frank Wall Street Reform and Consumer Protection Act. The results are available in the Additional Disclosures section of the Investor Relations site on www.trustmark.com . The information in this report is being “furnished” and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, is not subject to the liabilities of that section and is not deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, except as shall be expressly set forth by specific reference in such a filing. None of the information available through Trustmark’s Investor Relations site or elsewhere on Trustmark’s website shall be deemed incorporated by reference herein. 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/ Louis E. Greer Louis E. Greer Treasurer and Principal Financial Officer DATE: October 16, 2017