25. Thomas Peterffy
Net Worth: $19 Billion
A digital trading pioneer, Thomas Peterffy is CEO of Interactive Brokers. This corporation markets its specialized trading platform to sophisticated investors. He founded Interactive Brokers in 1993 after originally starting in market-making. Peterffy arrived in America in 1965 at age 21. He was once a penniless descendant of Hungarian aristocrats who lost nearly everything to the Soviets.
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