The investment seeks to replicate as closely as possible, before fees and expenses, the price and yield performance of the MVIS® Global Oil Refiners Index. The fund normally invests at least 80% of its total assets in securities that comprise the fund's benchmark index. The index includes equity securities and depositary receipts of companies that generate at least 50% of their revenues from crude oil refining. Products of these companies may include gasoline, diesel, jet fuel, fuel oil, naphtha, and other petrochemicals. The fund is non-diversified.