The investment seeks investment results that correspond generally to the price and yield (before the fund's fees and expenses) of an equity index called the NASDAQ AlphaDEX® Total US Market Index. The fund will normally invest at least 90% of its net assets (including investment borrowings) in the common stocks that comprise the index. The index is a modified market capitalization index designed to quantitatively identify and select U.S. exchange-listed securities issued by small, mid and large cap U.S. companies that exhibit growth and value factors and appear to have the greatest potential for capital appreciation.