iShares S&P Mid-Cap 400 Growth ETF, formerly iShares S&P MidCap 400 Growth Index Fund (the Fund), is an exchange traded fund. The Fund seeks investment results that correspond generally to the price and yield performance of the S&P MidCap 400 Growth Index (the Index). The Index measures the performance of the mid-capitalization growth sector of the United States equity market and consists of those stocks in the S&P MidCap 400 Index exhibiting the strongest growth characteristics. The Fund invests in a representative sample of securities included in the Index that collectively has an investment profile similar to the Index. The Index is a subset of the S&P 400 Index and consists of those companies exhibiting the strongest growth characteristics within the S&P 400 Index. The Fund generally invests at least 90% of its assets in securities of the Index and in depositary receipts representing securities of the Index. BlackRock Fund serves as the investment adviser to the Fund.