The investment seeks daily investment results, before fees and expenses, that correspond to three times (3x) the daily performance of the S&P 500®. The fund invests in securities and derivatives that ProShare Advisors believes, in combination, should have similar daily return characteristics as three times (3x) the daily return of the index. The index is a measure of large-cap U.S. stock market performance. It is a float-adjusted, market capitalization-weighted index of 500 U.S. operating companies and real estate investment trusts selected through a process. The fund is non-diversified.