of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Unregistered Sales of Equity Securities. The disclosure required by this

Entry into a Material Definitive Agreement. Acquisition of Trumid On October 19, 2026, Tradeweb Markets LLC (“ Acquiror ” or “ TWM LLC ”), a Delaware limited liability company and a subsidiary of Tradeweb Markets Inc., a Delaware corporation (“ Tradeweb Markets ” and, together Acquiror and its other subsidiaries, the “ Company ”), entered into an Equity Purchase Agreement and Agreement and Plan of Merger (the “ Transaction Agreement ”) with Park Merger Sub LLC, a Delaware limited liability co…

of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Material Modification to Rights of Security Holders. The information set forth under

of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Other Events. On February 5, 2026, the Board of Directors of the Company approved a share repurchase program with an indefinite term under which the Company may purchase up to $500 million of its Class A common stock (the “2026 Share Repurchase Program”) once the Company's existing $300.0 million share repurchase program (the "2022 Share Repurchase Program") has been exhausted. As of February 5, 2026, $23.2 million remained available for repurchase pursuant to the 2022 Share Repurchase Progra…

of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Entry into a Material Definitive Agreement. On December 31, 2025, Tradeweb Markets LLC (“Tradeweb Markets”), a wholly owned subsidiary of Tradeweb Markets Inc. (the “Company”), entered into a series of amendments effective as of November 1, 2025 (the “Amendments”) with Refinitiv US LLC and Refinitiv US Organization LLC (together, the “LSEG Parties”) to the master data license agreement, effective as of November 1, 2023, among Tradeweb Markets and the LSEG Parties (the “Master Data Agreement”)…

of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Director — Troy Dixon: Mr. Dixon resigned from the Board of Directors.

of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

President — Thomas Pluta: Mr. Pluta's employment and board membership will terminate effective September 30, 2024.

Director — Murray Roos: Mr. Roos resigned from the Board of Directors without a stated successor.

of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Entry into a Material Definitive Agreement. On April 5, 2024, Tradeweb Markets LLC (the “Buyer”), a Delaware limited liability company and a subsidiary of Tradeweb Markets Inc., a Delaware corporation (“Tradeweb Markets” and, together with Buyer and its other subsidiaries, the “Company”), entered into a Purchase and Sale Agreement (the “Purchase Agreement”) with ICD Intermediate Holdco 1, LLC, a Delaware limited liability company (“ICD Holdco”), ICD Holdings, LLC, a Delaware limited liability…

of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Entry into a Material Definitive Agreement. On November 21, 2023 (the “ Closing Date ”), Tradeweb Markets LLC (the “ Company ”), a wholly owned subsidiary of Tradeweb Markets Inc., entered into a credit agreement (the “ Credit Agreement ”), by and among the Company, as borrower, the lenders from time to time party thereto, Citibank, N.A., as administrative agent, issuing bank and swing line lender, and Citigroup Global Markets Inc., JPMorgan Chase Bank, N.A. and Morgan Stanley Senior Funding,…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The disclosure required by this item is included in

below. The Credit Agreement provides for a revolving credit facility in an aggregate principal amount of $500.0 million (the “ Revolving Credit Facility ”). The Revolving Credit Facility provides borrowing capacity to be used to fund ongoing working capital needs, letters of credit and for general corporate purposes, including potential future acquisitions and expansions. Subject to the satisfaction of certain conditions, the Company will be able to increase the Revolving Credit Facility by $…

of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Chairperson of the Board — Lee Olesky: Mr. Olesky resigned from his position as Chairperson of the Board with a named successor.