South Street Securities Holdings Inc. operates through its wholly owned subsidiaries. Affiliates include South Street Securities LLC, a FINRA and SIPC member who holds a FICC Tier 1 membership and is focused on repo dealer financing US Treasuries, Agency MBS, TBA Mortgage Origination Hedging, Equity Finance and Algorithmic Trade Execution, Matrix Applications LLC, a technology and back-office services company, AmeriVet Securities, Inc., a FINRA and SIPC member who operates an SEC registered Service-Disabled Veteran-Owned broker-dealer, and GX2 Systems LLC, a fintech software development company that engineers electronic trading solutions for the fixed income and futures markets.