|iShares U.S. Oil & Gas Exploration & Production ETF (the Fund) seeks investment results that correspond generally to the price and yield performance of the Dow Jones U.S. Select Oil Exploration & Production Index (the Index). The Index measures the performance of the oil exploration and production sub-sector of the United States equity market, and includes companies that are engaged in the exploration for and extraction, production, refining, and supply of oil and gas products. 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.