In brief
Jeffrey Yass is an American billionaire investor and co-founder of Susquehanna International Group (SIG), a Philadelphia-based quantitative trading firm renowned for its expertise in options market-making and proprietary trading strategies. As of October 2025, Yass holds a net worth of approximately $65.7 billion, making him one of the world's richest individuals and Pennsylvania's wealthiest resident.
Yass co-founded SIG in alongside college friends after honing skills in poker and options trading, drawing parallels between probabilistic decision-making in games and financial markets to build the firm's risk management framework. Under his leadership as managing director, SIG expanded from a niche options trader into a global powerhouse handling diverse assets, including equities, commodities, and cryptocurrencies, while maintaining a low public profile despite its scale.
Jeffrey Steven Yass was born in 1958 in Queens, New York City, into a middle-class Jewish family. His parents, both certified public accountants, fostered an environment of financial acumen; his father, Gerald Yass, additionally operated a fintech firm named Datatab.
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