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ProShares Short MidCap400 seeks daily investment results that correspond to the inverse (-1x) of the daily performance of the S&P MidCap 400 Index. The fund invests in financial instruments that the advisor believes, in combination, should produce daily returns consistent with the fund's investment objective. The index is a measure of mid-size company U.S. stock market performance. It is a float-adjusted, market capitalization-weighted index of 400 U.S. operating companies and real estate investment trusts selected through a process that factors in criteria such as liquidity, price, market capitalization, financial viability and public float. It is non-diversified.