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Table of Contents ( Mark One ) No X | UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT PUR UANT 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 Commission File Number 000-04197 United States Lime & Minerals , Inc. ( Exact name of Registrant as specified in its charter ) No X Texas ( State or other jurisdiction of incorporation or organization ) 5429 LBJ Freeway , Suite 230 , Dallas , Texas ( Address of principal executive offices ) Registrant's telephone number , including area code : ( 972 ) 991-8400 SECURITIES REGISTERED PURSUANT TO SECTION 12 ( b ) OF THE ACT : Trading Symbol ( s ) USLM Title of each class Common stock , $ 0.10 par value 75-0789226 ( I.R.S. Employer Identification Number ) 75240 ( Zip code ) Name of each exchange on which registered The Nasdaq Stock Market LLC 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 Exchange 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 Exchange Act 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 the definitions of " large accelerated filer , " " accelerated filer , ' " smaller reporting company , ” and “ emerging growth company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer 0 Non - accelerated filer 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 Exchange Act ) . Yes □ The aggregate market value of Common Stock held by non - affiliates computed as of the last business day of the Registrant's quarter ended June 30 , 2020 : $ 173,512,467 . Number of shares of Common Stock outstanding as of February 24 , 2021 : 5,653,336 . DOCUMENTS INCORPORATED BY REFERENCE Part III incorporates information by reference from the Registrant's definitive Proxy Statement to be filed for its 2021 Annual Meeting of Shareholders . Part IV incorporates certain exhibits by reference from the Registrant's previous filings .