Under normal circumstances, the fund will invest at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of medium-capitalization U.S. companies, ETFs providing exposure to such securities, and derivatives with economic characteristics similar to such securities. The index is a free float market capitalization weighted index designed to measure the performance of 400 mid-capitalization companies listed on U.S. stock markets. It is non-diversified.