The Bloomberg Commodity Indices are a family of financial benchmarks designed to provide liquid and diversified exposure to physical commodities via futures contracts. The Bloomberg Commodity Index is composed of commodity futures contracts and seeks to track futures price movements. The Index is calculated on an excess return basis and reflects future price movements. The Index rebalances its holdings annually, weighted two-thirds by trading volume and one-third by world product and weight-caps applied at the commodity, sector and group level for diversification. Roll periods for the Index typically occur from the sixth to the tenth business day, based on the roll schedule. The Index was formerly known as the Dow Jones-UBS Commodity Index.