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( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from $ to SIMMONS FIRST NATIONAL CORPORATION ( Exact name of registrant as specified in its charter ) Arkansas ( State or other jurisdiction of incorporation or organization ) Commission file number 000-06253 501 Main Street Pine Bluff Arkansas ( Address of principal executive offices ) Securities registered pursuant to Section 12 ( b ) of the Act : ( Registrant's Large accelerated filer Smaller reporting company ( 870 ) 541-1000 telephone number , including area code ) Trading Symbol ( s ) SFNC 71-0407808 ( I.R.S. Employer Identification No. ) 71601 ( Zip Code ) Title of each class Common stock , par value $ 0.01 per share Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . □ Yes No Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 ( 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 Name of each exchange on which registered The Nasdaq Global Select Market 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 and post such files ) . Yes No Accelerated filer Emerging Growth company 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 definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Non - accelerated filer 0 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 The aggregate market value of the Registrant's Common Stock , par value $ 0.01 per share , held by non - affiliates on June 30 , 2020 , was $ 1,825,590,184 based upon the last trade price as reported on the Nasdaq Global Select Market® of $ 17.11 . The number of shares outstanding of the Registrant's Common Stock as of February 22 , 2021 , was 108,087,110 . DOCUMENTS INCORPORATED BY REFERENCE Portions of the Proxy Statement for the 2020 Annual Meeting of Shareholders of the Registrant to be held on May 20 , 2021 , are incorporated by reference into Part III of this Form 10 - K .