Biography
Thomas Peterffy is among the world's most closely watched billionaires from UNITED STATES, with an estimated fortune of $96.6B. The bulk of Thomas Peterffy's wealth comes from Discount brokerage, closely tied to Discount brokerage. Thomas Peterffy is a Hungarian-born American billionaire businessman and the founder, chairman, and largest shareholder of Interactive Brokers. Born in Budapest, Hungary, in 1944, Peterffy immigrated to the United States in 1965. He is a pioneer of digital trading and developed the first electronic trading platform for securities. With an estimated net worth of $83.4 billion, Peterffy is a significant figure in the finance industry, leveraging his wealth source from the discount brokerage Interactive Brokers to become one of the wealthiest individuals globally. His career includes founding Interactive Brokers in 1993, and he served as CEO until 2019. Peterffy's achievements have transformed the financial landscape, making him a recognized leader in financial innovation. Key career milestones include Immigrated to the U.S. (1965); Purchased AMEX Seat (1977); Pioneered Handheld Computers (1983); Founded Interactive Brokers (1993). This profile documents verified holdings, career milestones, and multi-year net worth history drawn from Forbes rankings, company filings where available, and our editorial methodology. Readers use it to understand how public markets, private company stakes, and major business bets shape one of the largest personal fortunes on record. Wealth estimates move with stock prices, funding rounds, and disclosed transactions—figures on this page are research estimates, not cash balances. We publish year-by-year net worth history when verified data exists, link to primary sources, and update profiles when Forbes Real-Time Billionaires or major filings change the picture materially. For investors and researchers, the most useful reading pairs the headline number with ownership structure, geography, sector exposure, and the multi-year history chart on this page—especially during volatile markets when single-day moves can shift rankings without any operational change at the underlying companies.
