Sec Form 4 Filing - Zucker Scott @ Tradeweb Markets Inc. - 2023-03-16

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 Zucker Scott 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) Chief Admin. and Risk Officer (Last) (First) (Middle) TRADEWEB MARKETS INC., 1177 AVENUE OF THE AMERICAS 3. Date of Earliest Transaction (MM/DD/YY) 03/16/2023 (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 03/16/2023 F 1,632 ( 1 ) D $ 74.19 34,277 ( 2 ) D Class A common stock 03/16/2023 A 8 ( 3 ) A $ 0 34,285 ( 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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Zucker Scott TRADEWEB MARKETS INC. 1177 AVENUE OF THE AMERICAS NEW YORK, NY10036 Chief Admin. and Risk Officer Signatures /s/ Scott Zucker 03/20/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents shares withheld by the issuer to satisfy the tax withholding obligation associated with the settlement of restricted stock units ("RSUs") in respect of the issuer's Class A common stock ("Class A Common Stock") held by the reporting person. ( 2 )This amount includes (i) 3,001 unvested RSUs in respect of Class A Common Stock which are scheduled to vest on March 17, 2023, (ii) 1,697 unvested RSUs in respect of Class A Common Stock which are scheduled to vest on March 15, 2024, (iii) 10,180 unvested RSUs in respect of Class A Common Stock which are scheduled to vest on January 1, 2024, (iv) 2,985 unvested RSUs in respect of Class A Common Stock which are scheduled to vest in equal installments on March 15, 2024 and March 15, 2025, (v) 5,785 unvested RSUs in respect of Class A Common Stock that are scheduled to vest on January 1, 2025, and (vi) 5,822 unvested RSUs in respect of Class A Common Stock which are scheduled to vest in equal installments on March 15, 2024, March 15, 2025 and March 15, 2026, in each case subject to the reporting person's continued employment through the applicable vesting date. ( 3 )Represents shares of Class A Common Stock acquired in connection with the settlement of certain dividend equivalent rights (the "DERs"). The DERs were granted in connection with previously awarded RSUs, and settled in shares of Class A Common Stock in connection with the settlement of the RSUs to which they relate.

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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