Susquehanna International Group, LLP (SIG) is a privately-held global trading and technology firm. It consists of a number of affiliated entities specializing in trading and proprietary investments in equities, fixed income, energy, commodity, index, derivative products, private equity, and venture capital, research, customer trading, and institutional sales. The company is headquartered in Bala Cynwyd, a suburb of Philadelphia, US. The firm employs more than 1,900 people.

History
SIG was founded in 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. By October 1988, the firm had 100 employees. The company generated $30 million in annual revenue in its first year.

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

In 2005, SIG launched SIG China, its venture capital operation in China. As of 2022, the firm had invested in over 350 companies with over 70 exits.

In 2006, SIG launched Susquehanna Growth Equity, which invests in software and information services, and offers growth stage funding to companies operating in the U.S. and Israel. At this point, SIG had grown to over 12 offices throughout North America, Europe, and Asia.

The same year, the firm invested in Kuxun, a search engine company, which was sold three years later, in 2009, to Expedia.

The firm invested $5 million into ByteDance, the parent company of TikTok, in 2012 when ByteDance was founded. As of 2020, its stake ByteDance represented 15 percent of its fully-diluted capitalization table and was valued over $15 billion on paper.

In 2013, SIG acquired G1 Execution Services LLC (G1X) from E-Trade.

In 2014, SIG expanded its venture capital operations to Japan.

In 2017, SIG launched Susquehanna Private Capital, LLC, which focuses on buyouts of U.S. middle market companies in the aerospace, industrials, consumer, healthcare, and business and government services industries.

Also in 2017, SIG established Nellie Analytics, a Dublin-based sports betting company.

As of 2018, the firm traded about seven percent of U.S. ETF volume and more than $1.5 trillion in ETFs globally on an annual basis.

As of 2022, the firm had 14 offices worldwide.

Affiliates
 Susquehanna Financial Group (SFG): SIG's institutional broker-dealer business, which provides order execution and trading flow services, and equity research coverage of nearly 200 companies.
 Susquehanna Structured Capital: Structured capital group that provides debt and structured equity investments to middle and lower-middle market companies as well as commercial and multi-family real estate projects.
 Susquehanna Foundation: The corporate foundation of SIG. The foundation is organized as a 501(c)(3) nonprofit and contributes to school reform causes.

Controversies and legal issues

Allegations of front-running client accounts
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. The lawsuit reached a settlement in 2012, when the defendants, including SIG, agreed to a $18.5 million settlement.

Allegations of spoofing stock
In 2022, Northwest Biotherapeutics claimed in a suit filed in a Manhattan federal court that SIG, Citadel Securities, Virtu Financial, and other market making firms engaged in repeated spoofing that drove Northwest's share price downward.

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1987 establishments in Pennsylvania
American companies established in 1987
Companies based in Montgomery County, Pennsylvania
Financial services companies of the United States
Privately held companies based in Pennsylvania