Biography
Jeff Yass is among the world's most closely watched billionaires from UNITED STATES, with an estimated fortune of $67.4B. The bulk of Jeff Yass's wealth comes from Trading, investments, closely tied to Trading. Jeff Yass is an American billionaire businessman, investor, and philanthropist. Born in Queens, New York, in 1958, Yass is the co-founder and managing director of Susquehanna International Group (SIG), one of the world's largest and most successful trading firms. Yass's source of wealth stems from his expertise in trading and investments. He is currently ranked as the 28th richest person in the world with a net worth of $65 billion as of December 2025. Throughout his career, Yass has been a major player in options trading and market making, and he is also a significant investor in TikTok. Yass's wealth and influence have also allowed him to pursue various philanthropic initiatives, including school choice advocacy, and political donations, primarily to Republican candidates and causes. Key career milestones include Co-founded Susquehanna International Group (SIG) (1987); Joined the executive advisory council of the Cato Institute (2002); Invested in ByteDance (2012); Met with Donald Trump (2024). 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.