Thomas Peterffy

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$109 billion, making him the 18th richest person in the world.

Thomas Peterffy Thomas Peterffy in 2018 BornSeptember 30, 1944 (age 81) Budapest, Hungary CitizenshipUnited States EducationNew York University (attended) Spouse Dale McDonald ​ (divorced)​ Children3 Thomas Peterffy (born September 30, 1944)[1] is a Hungarian-born American billionaire businessman. He is the founder, chairman and the largest shareholder of Interactive Brokers.[2][3] As of November 2025, his estimated net worth is US$109 billion, making him the 18th richest person in the world.[4][5] Peterffy worked as an architectural draftsman after emigrating to the United…

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