The PowerShares DB Commodity Double Long ETN (Ticker: DYY) seeks investment results that correspond to TWICE (200%) the monthly performance of the Deutsche Bank Liquid Commodity Index – Optimum Yield. The index is composed of futures contracts on six commodities and weighted as such: Light sweet crude oil (35%), Heating Oil (20%), Gold (10%), Aluminum (12.5%), Corn (11.25%), and Wheat (11.25%). Throughout the year the precise weighting of each commodity in the index will change based upon price changes. The index is rebalanced annually to the base weights every November. The index provides a rules-based formula for replacing an expiring futures contract with a new contract having the highest implied roll yield. The DB Commodity ETNs are unsecured debt securities issued by Deutsche Bank AG, London Branch.