The Fund normally invests at least 80 percent of its total assets in securities that comprise the Funds benchmark index. The Energy Income 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 Energy Income Index is entirely comprised of companies involved in the midstream energy segment and includes common stock of corporations and equity securities of MLPs and MLP affiliates. Oil and gas storage and transportation companies may include those involved in oil and gas pipelines, storage facilities, and other activities associated with transporting, storing, and gathering natural gas, natural gas liquids, crude oil or refined products. To be initially eligible for the Energy Income Index, companies must generate at least 50 percent of their revenues from oil and gas storage and transportation (as defined above). Such companies may include medium- and large-capitalization companies and North American issuers, including Canadian issuers. As of December 31, 2023, the Energy Income Index included 27 securities of companies with a market capitalization range of approximately dollar 785.6 million and dollar 76.5 billion and a weighted average market capitalization of dollar 29.9 billion. The Energy Income Index is rebalanced quarterly. The Funds 80 percent investment policy is non-fundamental and may be changed without shareholder approval upon 60 days prior written notice to shareholders.