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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 MISSISSIPPI ( State or other jurisdiction of incorporation or organization ) 248 East Capitol Street , Jackson , Mississippi ( Address of principal executive offices ) Registrant's telephone number , including area code : Common Stock , no par value ( Title of Class ) for the fiscal year ended December 31 , 2020 or Large accelerated filer ✓ Non - accelerated filer Commission file number 000-3683 TRUSTMARK CORPORATION ( Exact name of Registrant as specified in its charter ) Trustmark 64-0471500 ( IRS Employer Identification Number ) Securities registered pursuant to Section 12 ( b ) of the Act : TRMK 39201 ( Zip Code ) ( 601 ) 208-5111 Nasdaq Global Select Market ( Name of Exchange on Which Registered ) Yes No ( Trading Symbol ) Yes ☐ No Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes No □ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes No □ Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See definition of " large accelerated filer , " " accelerated filer , " " smaller reporting company , ” and “ emerging growth company " in Rule 12b - 2 of the Exchange Act . Accelerated filer Smaller reporting company 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 . Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . □ Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act . ) Yes No Based on the closing sales price at June 30 , 2020 , the last business day of the registrant's most recently completed second fiscal quarter , the aggregate market value of the shares of common stock held by nonaffiliates of the registrant was approximately $ 920.2 million . As of January 31 , 2021 , there were issued and outstanding 63,408,802 shares of the registrant's Common Stock . DOCUMENTS INCORPORATED BY REFERENCE Portions of the Proxy Statement for Trustmark's 2021 Annual Meeting of Shareholders to be held April 27 , 2021 are incorporated by reference into Part III of the Form 10 - K report .