The Vanguard Energy ETF (Ticker: VDE) seeks investment results that correspond generally to the performance, before fees and expenses, of the MSCI US Investable Market Energy Index. The Index represents energy sector companies in the MSCI US Investable Market 2500 Index (IMI), which represents an investable universe the US equity market. The Index is composed of companies primarily involved in the construction or provision of oil rigs, drilling equipment, and other energy-related service and equipment. The Index also includes companies engaged in the exploration, production, marketing, refining, and/or transportation of oil and gas products. Index constituents are reclassified annually according to Global Industry Classification Standards (GICS).