The investment seeks to provide investment results that closely correspond, before fees and expenses, to the performance of the iSTOXX American Century USA Quality Growth Index (the "index"). Under normal market conditions, the fund invests at least 80% of its assets, exclusive of collateral held from securities lending, in the component securities of the underlying index. The index is designed to select securities of large- and mid-capitalization U.S. companies with attractive growth and quality fundamentals.