 NEW YORK--BUSINESS WIRE--Tradeweb Markets Inc. Nasdaq: TW, a leading, global operator of electronic marketplaces for rates, credit, equities and money markets, today reported total trading volume for December of 18.2 trillion tn. Average daily volume ADV for the month was 834.5 billion bn, an increase of 28.0 percent year over year YoY. Tradeweb fully electronic trading captured a record 10.6 of U.S. High Grade TRACE and 4.5 of U.S. High Yield TRACE in December. Rates Deriva 