Indexes

 

Standard & Poor’s 500, 400, 600

Some experts prefer the S&P 500 index, which includes a representative sample of 500 leading companies in the leading industries in the U.S.  Although they focus on "large-cap" (largest market capitalized firms), they represent more than 80% of the stock market.   The S&P, like Dow Jones, has many other indexes.  For example the S&P 400 tracks 400 mid-cap stocks and the S&P 600 tracks 600 small-cap stocks.  Visit their website for information and the other indices they have:
http://www2.standardandpoors.com