The investment seeks daily investment results that correspond to three times the inverse (-3x) of the daily performance of the Russell 2000® Index. The fund invests in derivatives that ProShare Advisors believes, in combination, should have similar daily return characteristics as three times the inverse (-3x) of the daily return of the index. The index is a measure of small-cap U.S. stock market performance. It is a float-adjusted, market capitalization-weighted index containing approximately 2000 of the smallest companies in the Russell 3000® Index or approximately 8% of the total market capitalization of the Russell 3000® Index. The fund is non-diversified.