The investment seeks capital appreciation and, secondarily, income. Normally, the fund seeks to achieve its investment objective by investing at least 80% of its net assets (plus any borrowings for investment purposes) in the securities of master limited partnerships (MLPs) and in other instruments that have economic characteristics similar to such securities. It principally invests in MLPs that derive their revenue primarily from businesses involved in the gathering, transporting, processing, treating, storing, refining, distributing, mining or marketing of natural gas, natural gas liquids, crude oil, refined products or coal. The fund is non-diversified.