The investment seeks to provide investment results that, before fees and expenses, correspond generally to the total return performance of the S&P MidCap 400 Growth Index that tracks the performance of medium capitalization exchange traded U.S. equity securities exhibiting growth characteristics. The fund generally invests substantially all, but at least 80%, of its total assets in the securities comprising the index. The index measures the performance of the mid-capitalization growth segment of the U.S. equity market.