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Table of Contents FORM 10 - K 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 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number : 001-38860 Tradeweb Markets Inc. ( Exact name of registrant as specified in its charter ) Delaware ( State of other jurisdiction of incorporation or organization ) 1177 Avenue of the Americas New York , New York ( Address of principal executive offices ) ( Registrant's Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Class A common stock , par value $ 0.00001 Large accelerated filer Smaller reporting company ( 646 ) 430-6000 telephone number , including area code ) Trading Symbol ( s ) 83-2456358 ( I.R.S. Employer Identification No. ) TW 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 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 Class of Stock Class A Common Stock , par value $ 0.00001 per share Class B Common Stock , par value $ 0.00001 per share Class C Common Stock , par value $ 0.00001 per share Class D Common Stock , par value $ 0.00001 per share 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 Accelerated filer Emerging growth company 10036 ( Zip Code ) 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 . Non - accelerated filer 0 Name of each exchange on which registered Nasdaq Global Select Market 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 . 0 Indicate by check mark whether the registrant has filed a report on and attestation of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of Sarbanes Oxley Act ( 15 U.S.C. 7262 ( b ) ) by 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 > No The aggregate market value of the voting and non - voting common equity held by non - affiliates of the registrant , based on the closing price of the Class A common stock on the NASDAQ Global Select Market on June 30 , 2020 , was approximately $ 6.2 billion . Shares Outstanding as of January 31 , 2021 101,674,943 96,933,192 1,654,825 28,884,108 Documents Incorporated by Reference Part III of this Annual Report on Form 10 - K incorporates by reference portions of the Registrant's Proxy Statement for its 2021 Annual Meeting of Stockholders . The Proxy Statement will be filed with the Securities and Exchange Commission within 120 days of the registrant's fiscal year ended December 31 , 2020 .