Olesky was previously President and is a Co-founder of Tradeweb. The announcement follows the departure of Jim Toffey, Co-founder and CEO of Tradeweb since 1998. Toffey is leaving the firm to pursue other opportunities.

Olesky has more than two decades of experience in the global fixed income markets, and for the past six years has focused on growing Tradeweb internationally and driving expansion into the derivatives markets. Prior to Tradeweb, Olesky was a Co-founder and CEO of BrokerTec, an electronic inter-dealer broker (sold to ICAP in 2003).

Billy Hult has been appointed President of Tradeweb and Head of U.S. Operations. Hult joined Tradeweb in 2000 and is responsible for originating and growing many of the Company's successful businesses in the U.S., including its TBA-Mortgage and US Treasury franchises. Prior to joining Tradeweb, Hult was a mortgage-backed securities trader at Societe Generale.

"In just 10 years, Tradeweb has evolved from a start-up to the premier trading platform for fixed income and derivatives," said Vic Simone, Managing Director of Goldman Sachs and Chairman of the Tradeweb Board of Directors. "I see Jim, Lee and Billy's contributions to Tradeweb manifested in its growth and reputation, and also in the motivation and principles of the entire staff."