The iShares U.S. Regional Banks ETF seeks to track the investment results of an index composed of U.S. equities in the regional banks sector. The Fund seeks investment results that correspond generally to the price and yield performance, before fees and expenses, of the Dow Jones U.S. Select Regional Banks Index. The Underlying Index measures the performance of the regional bank sector of the U.S. equity market. The Underlying Index is a subset of the Dow Jones U.S. Bank Index. Small and mid-size banks are selected for inclusion based on their relative three-year average total assets as a percentage of the three-year average total assets held by all banks in the Dow Jones U.S. Bank Index, as determined by Dow Jones. As of May 29, 2009, each bank in the Underlying Index had three-year average total assets that represented less than 5% of the three-year average total assets held by all banks in the Dow Jones U.S. Bank Index.