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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Name of Issuer)

(Title of Class of Securities)

(CUSIP Number)

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13D/A 0001104659-21-013684 0001842726 XXXXXXXX LIVE 8 Class A Common Stock 03/06/2025 false 0001758730 892672106 Tradeweb Markets Inc. 1177 Avenue of the Americas New York NY 10036 Timothy Knowland, GC Corporate 44 (0) 20 7797 1000 London Stock Exchange Group plc 10 Paternoster Square London X0 EC4M 7LS Michael Levitt (212) 277-4000 Freshfields US LLP 3 World Trade Center, 175 Greenwich St. New York NY 10007 Sebastian Fain (212) 277-4000 Freshfields US LLP 3 World Trade Center, 175 Greenwich St. New York NY 10007 0001772075 N Refinitiv US PME LLC b OO N DE 22988329.00 0.00 22988329.00 0.00 22988329.00 N 16.5 OO 0001772073 N Refinitiv US LLC b OO N DE 22988329.00 0.00 22988329.00 0.00 22988329.00 N 16.5 OO 0001842891 N LSEGA, Inc. b OO N DE 22988329.00 0.00 22988329.00 0.00 22988329.00 N 16.5 CO 0002006452 N LSEG US Holdco, Inc. b OO N DE 22988329.00 0.00 22988329.00 0.00 22988329.00 N 16.5 CO 0001772096 N Refinitiv TW Holdings Ltd. b OO N E9 96933192.00 0.00 96933192.00 0.00 96933192.00 N 45.5 OO 0001771967 N Refinitiv Parent Limited b OO N E9 119921521.00 0.00 119921521.00 0.00 119921521.00 N 50.8 OO 0001842726 N London Stock Exchange Group plc b OO N X0 119921521.00 0.00 119921521.00 0.00 119921521.00 N 50.8 CO HC Class A Common Stock Tradeweb Markets Inc. 1177 Avenue of the Americas New York NY 10036 Explanatory Note This Amendment No. 8 (this "Amendment No. 8") amends and supplements the beneficial ownership statement on Schedule 13D originally filed on February 8, 2021 (the "Original Statement"), as amended by Amendment No. 1 ("Amendment No. 1") filed on March 1, 2021, Amendment No. 2 ("Amendment No. 2") filed on March 12, 2021, Amendment No. 3 ("Amendment No. 3") filed on June 30, 2021, Amendment No. 4 ("Amendment No. 4") filed on July 8, 2022, Amendment No. 5 ("Amendment No. 5") filed on February 22, 2023, Amendment No. 6 ("Amendment No. 6") filed on January 3, 2024 and Amendment No. 7 ("Amendment No. 7") filed on September 19, 2024 on behalf of (i) Refinitiv US PME LLC, a Delaware limited liability company, (ii) Refinitiv US LLC, a Delaware limited liability company, (iii) LSEGA, Inc. a Delaware corporation, (iv) LSEG US Holdco, Inc., a Delaware corporation, (v) Refinitiv TW Holdings Ltd., a Cayman Islands exempted company, (vi) Refinitiv Parent Limited, a Cayman Islands exempted company, and (vii) London Stock Exchange Group plc, a public limited company organized in England and Wales. Each of the foregoing entities is hereinafter individually referred to as a "Reporting Person" and collectively as the "Reporting Persons." The Original Statement, as amended by Amendment No. 1, Amendment No. 2, Amendment No. 3, Amendment No. 4, Amendment No. 5, Amendment No. 6, Amendment No. 7 and this Amendment No. 8 (the "Schedule 13D"), relates to the Class A Common Stock, par value $0.00001 per share (the "Class A Common Stock"), of Tradeweb Markets Inc., a Delaware corporation (the "Issuer"). Schedule I attached to the Original Statement and any amendment thereto is hereby replaced and superseded in its entirety by Schedule I attached hereto. The penultimate paragraph of Item 4 is hereby supplemented by adding the below disclosure immediately prior to the last sentence in such paragraph: On March 6, 2025, the Board of the Issuer appointed Rich Repetto as a Class II director, effective March 6, 2025. Mr. Repetto will hold office until the annual meeting of the Issuer's stockholders to be held in 2027 and until his successor shall be elected and qualified or until his earlier death, resignation, retirement, disqualification or removal. Mr. Repetto was designated to serve on the Board by Refinitiv Parent pursuant to the Stockholders Agreement. The first two sentences of paragraphs (a) and (b) of Item 5 are hereby amended and restated as follows: (a) and (b) Calculations of the percentage of shares of Class A Common Stock beneficially owned assume that 116,163,963 shares of Class A Common Stock were outstanding as of January 31, 2025, as reported in the Issuer's Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 7, 2025, and also takes into account the shares of Class A Common Stock underlying any shares of Class B Common Stock or non-voting common units (the "LLC Interests") of Tradeweb Markets LLC, a subsidiary of the Issuer, held by Reporting Persons, as applicable. Each of the Reporting Persons may be deemed to be the beneficial owner of the shares of Class A Common Stock listed on such Reporting Person's cover page. See Item 5(a) above. Schedule I: Additional Information Concerning the Reporting Persons Refinitiv US PME LLC /s/ Teresa Hogan Teresa Hogan as Attorney-in-Fact 03/10/2025 Refinitiv US LLC /s/ Teresa Hogan Teresa Hogan as Attorney-in-Fact 03/10/2025 LSEGA, Inc. /s/ Teresa Hogan Teresa Hogan as Attorney-in-Fact 03/10/2025 LSEG US Holdco, Inc. /s/ Teresa Hogan Teresa Hogan as Attorney-in-Fact 03/10/2025 Refinitiv TW Holdings Ltd. /s/ Teresa Hogan Teresa Hogan as Attorney-in-Fact 03/10/2025 Refinitiv Parent Limited /s/ Teresa Hogan Teresa Hogan as Attorney-in-Fact 03/10/2025 London Stock Exchange Group plc /s/ Teresa Hogan Teresa Hogan as Attorney-in-Fact 03/10/2025