iShares U.S. Aerospace & Defense ETF, formerly iShares Dow Jones U.S. Aerospace & Defense 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 Dow Jones U.S. Select Aerospace & Defense Index (the Index). The Index measures the performance of the aerospace and defense sector of the United States equity market. Aerospace companies include manufacturers, assemblers and distributors of aircraft and aircraft parts. Defense companies include producers of components and equipment for the defense industry, such as military aircraft, radar equipment and weapons. The Fund invests in a representative sample of securities included in the Index that collectively has an investment profile similar to the Index. Its investment advisor is BlackRock Fund Advisors.