Jeff Yass

Jeffrey Steven Yass is a prominent American businessman who serves as the co-founder and managing director of Susquehanna International Group (SIG), a trading and technology firm based in Philadelphia. Under his leadership, the firm has become a significant player in international finance. In addition to his role at SIG, Yass is a major investor in the social media platform TikTok. His financial standing has placed him among the wealthiest individuals globally, with a net worth estimated at $65 billion as of late 2025.

Beyond his business ventures, Yass is active in political advocacy and philanthropy. He is a registered Libertarian and a significant donor to conservative political action committees, including Club for Growth Action and the Protect Freedom Political Action Committee. During the 2024 United States election cycle, he contributed approximately $100 million to Republican groups and campaigns. He also serves on the executive advisory council of the Cato Institute, a position he has held since 2002.

Yass is also recognized for his focus on educational reform. Together with his wife, Janine Yass, he has donated tens of millions of dollars toward the support of school choice initiatives. His public influence extends to policy discussions regarding international technology firms, notably involving his opposition to potential bans on TikTok. He remains a key figure in both the financial sector and Pennsylvania’s political landscape.