Jeff Yass

Jeffrey Steven Yass (born July 1958) is an American billionaire businessman. According to Forbes, Yass has a net worth of US$65 billion as of December 2025, up from $27.6 billion in April 2024. The richest man in Pennsylvania, he is also the 25th richest in the world. He is a registered Libertarian who gives money to conservative super PACs including Club for Growth Action and the Protect Freedom Political Action Committee. He and his wife Janine Yass are supporters of school choice, a cause to which they have donated tens of millions of dollars.

He is the co-founder and managing director of the Philadelphia-based trading and technology firm Susquehanna International Group (SIG) and a major investor in TikTok. After Yass and US President Trump met in March 2024, Trump went from supporting a ban on TikTok to opposing a ban. In 2002, Yass joined the executive advisory council of the Cato Institute and is a member of the executive advisory council. He donated approximately $100 million during the 2024 US election cycle to Republican groups and campaigns.