The investment seeks daily investment results that correspond to the inverse (-1x) of the daily performance of the Russell 2000® Index. The fund invests in financial instruments that ProShare Advisors believes, in combination, should produce daily returns consistent with the fund's investment objective. It is a float-adjusted, market capitalization-weighted index containing approximately 2000 of the smallest companies in the Russell 3000® Index or approximately 10% of the total market capitalization of the Russell 3000® Index, which in turn represents approximately 98% of the investable U.S. equity market. The fund is non-diversified.