The iShares Core S&P Small-Cap ETF is a passively managed fund that follows the S&P SmallCap 600 Index and is low cost and tax efficient. Small-cap funds which are part of a broader portfolio lower the amount of risk while adding stronger opportunities Small-Cap ETFs invest in stocks of companies that are deemed to have a small market capitalization size, generally between $300 million and $2 billion. Click on the tabs below to see more information on Small-Cap ETFs, including historical performance, dividends, holdings, expense ratios, technical indicators, analysts reports and more. iShares S&P Mid-Cap 400 Value ETF IJJ|ETF. #2 in Mid-Cap Value. The investment seeks to track the investment results of the S&P MidCap 400 Value IndexTM, which measures the performance of the mid-capitalization value sector of the U.S. equity market.