Sec Form 4 Filing - Bruni Enrico @ Tradeweb Markets Inc. - 2018-10-26

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Bruni Enrico 2. Issuer Name and Ticker or Trading Symbol Tradeweb Markets Inc. [ TW] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Managing Director, Europe/Asia (Last) (First) (Middle) TRADEWEB MARKETS INC., 1177 AVENUE OF THE AMERICAS 3. Date of Earliest Transaction (MM/DD/YY) 10/26/2018 (Street) NEW YORK, NY10036 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A common stock 04/08/2019 P 30,000 ( 1 ) A $ 27 104,358 ( 2 ) D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Option (Right to Buy) $ 20.59 10/26/2018 A 407,609 ( 3 ) 10/26/2028 Class A common stock 407,609 $ 0 407,609 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Bruni Enrico TRADEWEB MARKETS INC. 1177 AVENUE OF THE AMERICAS NEW YORK, NY10036 Managing Director, Europe/Asia Signatures /s/ Scott Zucker, Attorney-in-Fact for Enrico Bruni 04/08/2019 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The reporting person purchased these shares in connection with the closing of the initial public offering of the issuer (the "IPO") at the IPO price of $27.00 per share pursuant to the directed share program described in the issuer's registration statement. The shares are subject to a lock-up provision for a period of 180 days, as required under a lock-up agreement with the underwriters of the IPO. ( 2 )This amount includes 74,358 unvested restricted stock units in respect of the issuer's Class A common stock ("Class A Common Stock"). Subject to the reporting person's continued employment through each vesting date, these restricted stock units are scheduled to vest as follows: (i) 32,140 restricted stock units will vest on January 1, 2020, and (ii) 42,218 restricted stock units will vest on January 1, 2021. ( 3 )On October 26, 2018, the reporting person was granted an option to purchase 407,609 shares of Class A Common Stock, which option is vested as to 326,087 of the shares subject thereto as of the date hereof. The remainder of the option will vest on January 1, 2020, subject to the reporting person's continued employment on such date.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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