Jeff Yass

Jeffrey S. Yass (born 1956) is an American options trader, and a co-founder and managing director of the Philadelphia-based Susquehanna International Group (SIG). In 2001, he joined the executive advisory council of the Cato Institute.

While at the State University of New York in Binghamton in the 1970s, Yass and five fellow students became friends and later co-founded Susquehanna International Group (SIG), the largest trader of liquid stocks in the USA.

The billionaire trader Israel Englander sponsored Yass for a seat on the Philadelphia Stock Exchange, and SIG was initially run from an office at the Exchange. His father, Gerald Yass, also helped to found the company. Prior to this, Yass was a professional gambler.