Susquehanna International Group, LLP (SIG) is a privately held, global trading and technology firm.

The firm employs more than 3,000 people in offices across North America (New York City, Chicago, San Francisco, Philadelphia, Boston, Stamford), Australia (Sydney), Europe (Dublin, London) and Asia (Shanghai, Beijing, Hong Kong, Tokyo).

[2][3] SIG was founded in May 1987 by six entrepreneurs, including Arthur Dantchik and Jeff Yass, who met in the late 1970s at the State University of New York at Binghamton, where they gathered to play cards.

[5] In 1996, SIG founded Heights Capital Management in San Francisco, which focuses on PIPE investments in healthcare and technology.

SIG played a significant market maker role in the 2024 merger of Digital World Acquisition Corp. and Trump Media & Technology Group.

[17][18] In 2009, the California Public Employees' Retirement System led a class action lawsuit against SIG and other broker-dealers, including Goldman Sachs, Bank of America, Van der Moolen, and others, for improperly executing trades for their dealer accounts ahead of their clients.