March 9, 2021 The Bloomberg Gas Oil Subindex is up almost 30% for the year, signaling the strong rally in energy and encouraging investors to hop on board the bandwagon with ETFs like the The fund seeks to track the investment results of the Dynamic Oil Services Intellidex Index. The exchange traded fund generally will invest at least 90% of its total assets in the securities that comprise the underlying index. The underlying index is composed of common stocks of U.S. companies that assist in the production, processing, and distribution of oil and gas. The fund is up a healthy 37% thus far in 2021.