The Alerian Midstream Energy Index is a broad-based composite of North American energy infrastructure companies who earn the majority of their cash flow from midstream activities involving energy commodities, such as gathering & processing, liquefaction, pipeline transportation, rail terminaling, and storage of energy commodities. The Index is calculated by S&P Dow Jones Indices using a capped, float-adjusted, capitalization weighted methodology. The Index is a price return index (i.e., the reinvestment of dividends is not reflected in the value of the Index).