Jeff Yass

Trading experience became the foundation for Susquehanna

Yass studied at SUNY Binghamton, developed a deep interest in gambling and probability, and began trading on the Philadelphia Stock Exchange in the early 1980s. Forbes reports that billionaire Israel Englander provided backing during that early trading period, giving Yass access to capital but not an inherited operating company. ^[1]

In 1987 Yass and several partners founded Susquehanna International Group. The firm says its founders combined quantitative skills, game theory and trading experience to build a collaborative market-making business focused heavily on derivatives. ^[2][1]

Susquehanna expanded from exchange-floor trading into a global operation spanning market making, technology, quantitative research and private investing. Yass' economic connection comes from cofounder ownership in the private firm rather than from the gross capital traded on behalf of the business. ^[2][1]

Private ownership and investment gains created the billionaire-scale outcome

Because Susquehanna remained privately held, the value of Yass' stake could compound alongside the firm's trading profits and expansion without a public-market exit. That ownership is the central bridge between the firm's operating success and his personal wealth. ^[1][2]

The firm also accumulated valuable private investments, including a major stake in ByteDance. Those holdings broadened the source of value beyond trading alone, but they remained downstream of the investment platform Yass and his partners built together. ^[1]