The E-TRACS UBS Bloomberg CMCI Index ETN (Ticker: UCI) seeks investment results that correspond generally to the performance, before fees and expenses, of the UBS Bloomberg Constant Maturity Commodity Index Total Return. The index diversifies across both commodities and maturities and measures the returns from a basket of 28 commodity futures contracts representing the energy, precious metals, industrial metals, agricultural and livestock sectors. In addition, the commodity futures contracts are diversified across five constant maturities from three months up to three years. For a commodity contract to be included in the CMCI, certain primary and secondary criteria have to be fulfilled, such as technical characteristics and financial thresholds. The weighting process for the CMCI is designed to reflect the economic significance and market liquidity of each commodity. A two-step approach is used to determining target weights of the futures contracts in the CMCI. 1) Regional Consumer Price Indexes (CPI), Producer Price Indexes (PPI) and Gross Domestic Product (GDP) data are used to produce the Economic Weight (EW) of each of the sub-sectors of the CMCI. 2) The market value of the amount of each commodity that is consumed is used to calculate the individual instrument weight of each commodity, based on such market value as a percentage of the total market value of the consumption of all commodities included in the relevant sector. The CMCI Governance Committee reviews the weightings of the futures contracts in November and May. The ETN is issued by UBS AG.