Tradeweb Markets Inc. (Tradeweb) is an international financial services company that builds and operates electronic over-the-counter (OTC) marketplaces for trading fixed income products, ETFs, and derivatives. The company was co-founded in 1996 by Lee Olesky and Jim Toffey. Its customers include banks, asset managers, central banks, pension funds and insurance companies. It is known for having used technology to move the bond-trading market towards greater efficiency and transparency for institutions that trade fixed income and derivatives products.