Thomas Peterffy
Chairman Emeritus

Thomas Peterffy is founder and chairman of Interactive Brokers and was the chairman and a trustee of Common Sense Society (2021-2023). A pioneer of digital trading in the 1980s, he was the first to build computer systems able to trade financial assets electronically, independent of direct human intervention. Born in Budapest, Hungary in 1944, he escaped communism in 1965 by emigrating to the United States. He learned computer programming, and his formula for pricing contingent assets was an early version of what is now known as the Black-Scholes model. In 1977, he became a member of the American Stock Exchange. Peterffy built the first automated market-making firm for stocks, options, and futures, which later gave rise to Interactive Brokers, a global, electronic broker with more than two-thousand employees and market capitalization of $39 billion.



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