The investment seeks daily investment results, before fees and expenses, that correspond to the inverse (-1x) of the daily performance of the Dow Jones U.S. FinancialsSM 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 seeks to measure the performance of certain companies in the financial services sector of the U.S. equity market. The fund is non-diversified.