 NEW YORK--BUSINESS WIRE--Tradeweb Markets Inc. Nasdaq: TW, a leading, global operator of electronic marketplaces for rates, credit, equities and money markets, today announced the appointment of Dan Cleaves as a Managing Director in its Dealerweb wholesale unit. Based in New York, Mr. Cleaves will lead the strategy and development of the Dealerweb Central Limit Order Book CLOB recently acquired from Nasdaq. Mr. Cleaves will draw on his extensive experience running electronic markets for t 