The SPDR S&P 500 ETF Trust, commonly known by its ticker symbol SPY, is an exchange-traded fund structured as a unit investment trust. It seeks to track, before expenses, the price and yield performance of the S&P 500 Index by holding, as far as practicable, a portfolio of common stocks included in the index, with portfolio weights that substantially correspond to the index.
Launched on January 22, 1993, SPY was the first exchange-traded fund listed in the United States. It is part of the SPDR family of funds. The trust's trustee is State Street Global Advisors Trust Company, its sponsor is PDR Services LLC, and its distributor is ALPS Distributors, Inc. The fund's gross expense ratio is 0.0945%; its CUSIP is 78462F103 and its ISIN is US78462F1030.Wikipedia