The investment seeks daily investment results, before fees and expenses, that correspond to three times the inverse (-3x) of the daily performance of the Dow Jones Industrial Average® Index. The fund invests in financial instruments that ProShare Advisors believes, in combination, should produce daily returns consistent with the fund's investment objective. The index is a price-weighted index and includes 30 large-cap, blue-chip U.S. stocks, excluding utility and transportation companies. The fund is non-diversified.