Joel Greenberg | $1B+

Get in touch with Joel Greenberg | Joel Greenberg, cofounder of Susquehanna International Group (SIG), is one of the most influential and discreet figures in quantitative trading and options market making. Launching SIG in 1987 with a small group of poker-playing colleagues, Greenberg helped pioneer a probabilistic, game-theory-driven approach to trading that became the firm’s hallmark and propelled it into a global powerhouse across equities, options, fixed income, private equity, and venture capital. Known for his analytical rigor and long-term investment vision, he also helped lead major early bets such as SIG’s stake in ByteDance. Greenberg remains a defining, though intentionally low-profile, architect of the modern quantitative finance ecosystem.

Joel Kenneth Greenberg (born 1957 or 1958) is an American billionaire businessman, and a co-founder of Susquehanna International Group. As of January 2025, Forbes estimated his net worth at US$2.3 billion.[1] His mother Carol Potasnik Greenberg (1927–2013) was born in Yonkers, New York, and moved to Israel in her 40s.[2] Greenberg earned a bachelor's degree from Binghamton University, where he met his fellow billionaire co-founder, Jeff Yass.[1] He then earned a juris doctor degree from Columbia Law School.[1] In 1987, he co-founded Susquehanna International Group, and was its chief operating officer.[1] Greenberg owns about 3% of Susquehanna, and retired in 2016.[3] He was an executive producer on the Barry Levinson 2021 film, The Survivor, along with business partner and friend Matti Leshem, who was a producer.[4] Greenberg is married to Marcy Gringlas,[2][5] with three children, and lives in Gladwyne, Pennsylvania.[1] They also have a home in Vineyard Haven on Martha's Vineyard, Massachusetts.[2] Marcy Gringlas, the daughter of Holocaust survivors Joseph and Reli, is a longtime USC Shoah Foundation donor and member of its board of councilors.[6] Through their Seed the Dream Foundation, Joel and Marcy have donated over $2 million to the USC Shoah Foundation.[7]

Disclaimer: This profile is based on publicly available information. No endorsement or affiliation is implied.

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