DEFINITION of 'S&P 600'
An index of small-cap stocks managed by Standard and Poor's. The S&P 600 SmallCap Index covers a broad range of small cap stocks in the United States. The index is weighted according to market capitalization and covers about 3-4% of the total market for equities in the United States.
BREAKING DOWN 'S&P 600'
The S&P 600 is somewhat comparable to the Russell 2000 Index in that both measure the performance of small-cap stocks. Most references to the S&P index are regarding the S&P 500 since its stocks are better knowns. There are several ETFs available for investors who wish to purchase this index.