iShares S&P U.S. Preferred Stock Index Fund (the Fund) seeks investment results that correspond to the price and yield performance of the S&P Preferred Stock Index (the Index). The Index measures the performance of a select group of preferred stocks listed on the New York Stock Exchange (NYSE), the American Stock Exchange and the Nasdaq Stock Market, Inc. The Index includes preferred stocks with market capitalizations over $100 million that meet minimum price, trading volume and other requirements determined by the Index provider. The Fund invests in sectors, such as diversified financials, banks, real estate, insurance, utilities, automobiles and components, capital goods, telecommunication services, energy and S-T Securities. The Fund�s investment adviser is BlackRock Fund Advisors.