The investment seeks to replicate as closely as possible, before fees and expenses, the price and yield performance of the MVIS® North America Energy Infrastructure Index. The fund will normally invest at least 80% of its total assets in securities that comprise the fund's benchmark index. The index is a rules-based index designed to give investors a means to track the overall performance of North American companies involved in the midstream energy segment, which includes master limited partnerships (MLPs) and corporations involved in oil and gas storage and transportation. The fund is non-diversified.