Thomas Peterffy (born 1944) is a Hungarian-born American entrepreneur. He is the founder and head of Interactive Brokers (Nasdaq: IBKR) and played a key role in founding the Boston Options Exchange. Peterffy worked as an architectural draftsman after immigrating to the United States and later became a computer programmer. In the 1970s, Peterffy purchased a seat on the American Stock Exchange and played a key role in developing the electronic trading of securities.