The investment seeks to track the investment results of an index composed of large- and mid-capitalization U.S. equities. The fund generally invests at least 90% of its assets in securities of the underlying index and in depositary receipts representing securities of the underlying index. It seeks to track the investment results of the Russell 1000® Index (the "underlying index"), which measures the performance of large- and mid-capitalization sectors of the U.S. equity market.