American global trading and technology firm Susquehanna International Group is opening cryptocurrency trading to its clients, initially in the form of Bitcoin (BTC) futures, the New York Times reported June 5. The company, based in Bala Cynwyd, Pennsylvania, is one of the largest financial firms in the world, trading traditional investments, such as stocks, options, and exchange traded funds (ETFs). The privately-held company has also built a trading desk for the purchase and sale of cryptocurrencies in private deals over the past two years.