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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ( Mark One ) 冈 ANNUAL REPORT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES ACT OF 1934 For The Fiscal Year Ended December 31 , 2020 . TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( D ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from Texas ( State or other jurisdiction of incorporation or organization ) 7777 Henneman Way McKinney , Texas ( Address of principal executive offices ) Independent Bank Group , Inc. ( Exact name of registrant as specified in its charter ) Commission file number 001-35854 Large Accelerated Filer Non - Accelerated Filer Title of Each Class Common Stock , par value $ 0.01 per share to ( 972 ) 562-9004 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) IBTX ( I.R.S. Employer Identification No. ) 13-4219346 Securities registered pursuant to Section 12 ( g ) of the Act : None 0 75070-1711 ( Zip Code ) Name of Each Exchange on which Registered NASDAQ Global Select Market 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 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 and posted on its corporate Web site , if any , every Interactive Data File required to be submitted and posted 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 Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , or a smaller reporting company . See the definitions of " large accelerated filer , ” “ accelerated filer ” and “ smaller reporting company " in Rule 12b - 2 of the Exchange Act . ( Check one ) : Accelerated Filer Smaller Reporting Company Emerging Growth Company 000 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 . Yes > No 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 shares of common stock held by non - affiliates based on the closing price of the common stock on the Nasdaq Global Select Market on June 30 , 2020 was approximately $ 1,494,273,058 . At February 25 , 2021 , the Company had outstanding 43,192,020 shares of common stock , par value $ .01 per share . Documents Incorporated By Reference : Portions of the Company's Proxy Statement relating to the 2021 Annual Meeting of Shareholders , which will be filed within 120 days after December 31 , 2020 , are incorporated by reference into Part III , Items 10 - 14 of this Annual Report on Form 10 - K .