The SPDR S&P 500 ETF (Ticker: SPY) seeks investment results that correspond generally to the performance, before fees and expenses, of the S&P 500 Index. The index is market capitalization weighted with approximately 75% coverage of the U.S. equity market. The index is maintained by the S&P Index Committee, which is a team of Standard & Poor's economists and analysts. The Index Committee meets on a regular basis to review all S&P index constituents. The goal of the Committee is to ensure that the S&P 500 reflects the risk and return characteristics of a universe of large cap US companies. Criteria for index inclusion in the S&P 500 includes: minimum of $5 billion market cap, minimum public float of 50%, the ratio of annual dollar value traded to market cap for the company should be 0.30 or greater, and constituents must be operating companies (no closed-end funds, ETFs, or holding companies). SPY was the first successful ETF launched on an American stock exchange.