The S&P SmallCap 600 Index (S&P 600) is a stock market index established by Standard & Poor's. It covers roughly the small-cap range of US stocks, using a capitalization-weighted index. To be included in the index, a stock must have a total market capitalization that ranges from $600 million to $2.4 billion at the time of addition to the index. As of 31 January 2020, the index's median market cap was $1.13 billion and covered roughly three percent of the total US stock market. These smallcap stocks cover a narrower range of capitalization than the companies covered by the Russell 2000 Smallcap index which range from $169 million to $4 billion. The market valuation for companies in the SmallCap Index and other indices change over time with inflation and the growth of publicly traded companies. The S&P 400 MidCap index combined with the SmallCap 600 compose the S&P 1000, and the S&P 1000 plus the S&P 500 comprise the S&P 1500. The index was launched on October 28, 1994.
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