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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ( 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 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35388 PROSPERITY BANCSHARES , INC.Ⓡ ( Exact name of registrant as specified in its charter ) TEXAS ( State or other jurisdiction of incorporation or organization ) Prosperity Bank Plaza 4295 San Felipe , Houston , Texas ( Address of principal executive offices ) Large Accelerated Filer Non - accelerated Filer 74-2331986 ( I.R.S. Employer Identification No. ) Registrant's Telephone Number , Including Area Code : ( 281 ) 269-7199 Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common stock , par value $ 1.00 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 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 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 77027 ( Zip Code ) Trading Symbol ( s ) . PB Name of each exchange on which registered New York Stock Exchange , Inc. X 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 No X 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 the definitions 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 port 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 . X Indicate by check mark whether the registrant is a shell company ( as defined Rule 12b - 2 of the Exchange Act ) . Yes No X The aggregate market value of the shares of common stock held by non - affiliates as of June 30 , 2020 , based on the closing price of the common stock on the New York Stock Exchange on June 30 , 2020 was approximately $ 5.31 billion . As of February 22 , 2021 , the number of outstanding shares of common stock was 92,930,789 . 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 .