South Street Securities LLC, a registered broker dealer specializing in repo financing of U.S. Treasuries, Agency MBS, TBA mortgage origination hedging and equity finance. GX2 is an innovative financial market software engineering company specializing in the development and implementation of next-generation U.S. Treasury (UST) securities liquidity. The GX2 platform provides algorithmic, agency brokerage and principal execution solutions to its growing network of users, along with direct exchange connectivity, real-time pricing of cash and futures markets and post-trade reporting services.