The investment seeks investment results that correspond generally to the price and yield performance of the Markit iBoxx® USD Liquid High Yield Index. The fund generally invests at least 90% of its assets in the securities of the underlying index and in investments that provide substantially similar exposure to the securities in the index. The underlying index is a rules-based index consisting of liquid U.S. dollar-denominated, high yield corporate bonds for sale in the United States, as determined by the index provider. The underlying index is designed to provide a broad representation of the U.S. dollar-denominated liquid high yield corporate bond market.