ProShares UltraShort MidCap400 (the Fund) seeks daily investment results that correspond to twice (200%) the inverse (opposite) of the daily performance of the S&P MidCap 400 Index (the Index). The Index is a measure of mid-size company United States stock market performance. It is a float-adjusted market capitalization weighted index of 400 United States operating companies and real estate investment trusts (REITs). Securities are selected for inclusion in the Index by the S&P U.S. Index Committee through a non-mechanical process that factors criteria, such as liquidity, price, market capitalization and financial viability. Reconstitution occurs both on a quarterly and ongoing basis. The Index is a price return index. The Fund takes positions in securities and/or financial instruments that, in combination, should have similar daily return characteristics as -200% of the daily return of the Index. The Fund�s investment advisor is ProShare Advisors LLC.