The investment seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of the MarketAxess U.S. Investment Grade 400 Corporate Bond Index that tracks the investment grade U.S. corporate bond market. Under normal market conditions, the fund generally invests substantially all, but at least 80%, of its total assets in the securities comprising the index and in securities that the Adviser determines have economic characteristics that are substantially identical to the economic characteristics of the securities that comprise the index.