SPY - SPDR S&P 500 ETF Trust
The SPDR S&P 500 ETF is a fund that, before expenses, generally corresponds to the price and yield performance of the S&P 500 Index . This ETF is designed to provide portfolios with low portfolio turnover, accurate tracking, and lower costs.
The Index is a widely used measure of large U.S. stock market performance. It includes 500 leading companies in leading industries of the U.S. economy and it focuses on the large cap segment of the market, with approximately 75% coverage of U.S. equities. Companies are selected for inclusion in the Index by Standard & Poor's based on adequate liquidity, appropriate market capitalization, financial viability and public float.
Further information: https://www.spdrs.com/product/fund.seam?ticker=SPY