The investment seeks to track the investment results (before fees and expenses) of the FTSE RAFI? US 1000 Index (the underlying index). The fund generally will invest at least 90% of its total assets in the securities that comprise the underlying index. The underlying index is composed of 1,000 common stocks that FTSE International Limited and Research Affiliates LLC strictly in accordance with their guidelines and mandated procedures, include to track the performance of the largest U.S. companies based on the following four fundamental measures: book value, cash flow, sales and dividends.