ProShares S&P 500 Dynamic Buffer 

The index measures the performance of this Dynamic Buffer Strategy based on the S&P 500 Index using a long position in the S&P 500 Index along with three different S&P 500 Index options that have one day to expiration. Under normal circumstances, the fund will invest at least 80% of its total assets in components of the index or in instruments with similar economic characteristics. The fund is non-diversified.