VanEck Vectors® Oil Refiners ETF (CRAK®) seeks to replicate as closely as possible, before fees and expenses, the price and yield performance of the MVIS® Global Oil Refiners Index (MVCRAKTR), which is a rules-based, modified capitalization weighted index intended to give investors a means of tracking the overall performance of companies involved in crude oil refining which may include: gasoline, diesel, jet fuel, fuel oil, naphtha, and other petrochemicals.