VanEck Oil Services ETF seeks to replicate as closely as possible, before fees and expenses, the price and yield performance of the MVIS US Listed Oil Services 25 Index. The fund normally invests at least 80% of its total assets in securities that comprise the fund's benchmark index. The index includes common stocks and depositary receipts of U.S. exchange-listed companies in the oil services segment. Such companies may include small- and medium-capitalization companies and foreign companies that are listed on a U.S. exchange. The fund is non-diversified.

ProShares UltraPro Short Dow30 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.

SPDR S&P Oil & Gas Equipment & Services ETF seeks to provide investment results that, before fees and expenses, correspond generally to the total return performance of an index derived from the oil and gas equipment and services segment of a U.S. total market composite index. In seeking to track the performance of the S&P Oil & Gas Equipment & Services Select Industry Index, the fund employs a sampling strategy. It generally invests substantially all, but at least 80%, of its total assets in the securities comprising the index. The index represents the oil and gas equipment and services segment of the S&P Total Market Index ("S&P TMI").