The ProShares K-1 Free Crude Oil Strategy ETF (OILK) is a mutual fund that aims to provide investors with exposure to the performance of the crude oil market. This ETF utilizes a strategy that seeks to minimize the tax burden for investors by avoiding the issuance of K-1 tax forms. OILK invests in a portfolio of futures contracts and other financial instruments related to crude oil, providing investors with a convenient and tax-efficient way to gain exposure to this commodity.