|iShares Dow Jones U.S. Energy Sector Index Fund seeks investment results that correspond generally to the price and yield performance of the Dow Jones U.S. Oil & Gas Index (the Index). The Index measures the performance of the oil and gas sector of the United States equity market, and includes companies in industry groups, such as oil and gas producers, and oil equipment, services and distribution. The Fund invests in a representative sample of securities included in the Index that collectively has an investment profile similar to the Index. Due to the use of representative sampling, the Fund may or may not hold all of the securities that are included in the Index. The Fund's investment advisor is BlackRock Fund Advisors (BFA).