S&P Small Cap 600 vs. Russell 2000
There is no standard definition of a small cap stock. The methodology used deciding what stocks are included in a small cap index can result in significant return differences. As of the middle of 2014, The S&P SmallCap outperformed the Russell 2000 for 12 of the last 19 years. The Russell 2000 has been tracking small caps for 30+ years; the S&P SmallCap 600 has been around for 19+ years.
S&P SmallCap 600 vs. Russell 2000