Susquehanna International Group is a global quantitative trading firm. It provides execution services for Nasdaq and listed stocks, ETFs, ADRs, and options. Through its institutional brokerage affiliate, Susquehanna Financial Group, it also offers equity research to institutional investment managers and prides itself on providing independent analysis. SIG's other verticals include private equity and venture capital, sports analytics, and structured finance.

The firm prides itself on its low turnover rate, lack of pigeonholed job descriptions, and absence of “corporate constraints.” The firm is a member of numerous local, national, and international stock exchanges, including the New York Stock Exchange, Nasdaq, and all of the U.S. option exchanges. SIG is headquartered outside of Philadelphia. In addition to its domestic presence, it has offices in Europe, Asia, and Australia.

What distinguishes the firm from competitors is the way SFG integrates traditional banking services with its extensive trading operations in equities, ETFs, and derivatives. SIG has extensive algorithmic trading capabilities, and trades tens of million shares on a daily basis. SIG handles roughly one out of every seven stock options traded in the world. The firm is also a market maker for more than 3,000 Nasdaq stocks.

In addition, SIG is one of the biggest U.S. option market makers and a specialist in more index options than any other market maker. The firm is a big player in other securities areas as well, including ADRs, international securities, exchange traded funds (ETFs), OTC equity, currency, and fixed-income derivatives.