Thomas Peterffy

The native form of this personal name is Péterffy Tamás. This article uses Western name order when mentioning individuals.

Thomas Peterffy
Born (1944-09-30) September 30, 1944
Budapest, Hungary
CitizenshipUnited States
EducationNew York University (dropped out)
OccupationsFounder and chairman of Interactive Brokers
Known forDeveloping first electronic trading platform of securities
SpouseDale McDonald (divorced)
Children3

Thomas Peterffy (born September 30, 1944) is a Hungarian-born American billionaire businessman. He is the founder, chairman and the largest shareholder of Interactive Brokers. As of November 2025, his estimated net worth is US$57.3 billion, making him the 27th richest person in the world.

Peterffy worked as an architectural draftsman after emigrating to the United States, and later became a computer programmer. In 1977, he purchased a seat on the American Stock Exchange and played a role in developing the first electronic trading platform for securities.

Peterffy is a donor to the Republican Party and conservative causes.

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