State Street Corporation is a global financial services company headquartered in Boston, Massachusetts. Founded in 1792, it specializes in asset custody, investment management, and fund administration for institutional clients. Through its subsidiary, State Street Global Advisors (SSGA), it manages ETFs, including the SPDR S&P 500 ETF (SPY). As one of the world's largest custodian banks, it provides financial services to pension funds, mutual funds, and other institutional investors across more than 100 markets.