Strategy. The Fund invests in companies whose securities are listed on U.S. national securities exchanges, including through American Depositary Receipts (ADRs), which are U.S. dollar-denominated securities of foreign issuers listed on U.S. national securities exchanges. Investments consist primarily of master limited partnerships (MLPs) and common stocks. As a non-principal investment strategy, the Fund may also invest in securities such as preferred stocks, warrants, equity-like instruments, and debt instruments. With respect to up to 10% of its total assets, the Fund may invest in high-yield debt securities, preferred shares, and convertible securities. The Fund invests without regard to market capitalization. Under normal circumstances, the Fund invests at least 80% of its net assets in midstream energy infrastructure companies. An issuer is considered … Show more… The Fund invests in companies whose securities are listed on U.S. national securities exchanges, including through American Depositary Receipts (ADRs), which are U.S. dollar-denominated securities of foreign issuers listed on U.S. national securities exchanges. Investments consist primarily of master limited partnerships (MLPs) and common stocks. As a non-principal investment strategy, the Fund may also invest in securities such as preferred stocks, warrants, equity-like instruments, and debt instruments. With respect to up to 10% of its total assets, the Fund may invest in high-yield debt securities, preferred shares, and convertible securities. The Fund invests without regard to market capitalization. Under normal circumstances, the Fund invests at least 80% of its net assets in midstream energy infrastructure companies. An issuer is considered to be a midstream energy infrastructure company if it owns and operates assets used in energy logistics, including, without limitation, assets used in transporting, storing, gathering, processing, distributing, or marketing of natural gas, natural gas liquids, crude oil, refined products, coal, or electricity, or provides energy-related equipment and services. In selecting investments for the Fund, the Portfolio Managers combine a top-down deductive reasoning approach with a detailed bottom-up analysis of individual companies that have exposure to the trends identified. The Portfolio Managers may sell all or a portion of a position of the Funds portfolio holding for a number of reasons, including (1) the issuers fundamentals deteriorating, (2) the parameters established for the securitys profits or losses being realized, or (3) the Fund requiring cash to meet redemption requests. The Fund is non-diversified under the Investment Company Act and under Subchapter M of the Internal Revenue Code (the Code). Accordingly, the Fund typically invests a greater portion of its assets, and its performance may be affected by, a smaller number of issuers than if it were a diversified fund. In addition, as a C corporation, the Fund generally will be subject to U.S. federal income tax on its taxable income at the tax rate applicable to corporations (currently 21%), will not benefit from current favorable federal income tax rates on long-term capital gains, and will be subject to state and local income taxes by reason of its investments in equity securities of MLPs. Show less