0001758730 2021-04-29 2021-04-29 0001758730 false 8-K 2021-04-29 Tradeweb Markets Inc. DE 001-38860 83-2456358 1177 Avenue of the Americas New York NY 10036 646 430-6000 false false false false Class A common stock, par value $0.00001 TW NASDAQ false 2021-04-29 2021-04-29