The investment seeks a return linked to the performance of the Alerian Midstream Energy Dividend Index (the ?index?). The index is a fundamentally-weighted index based on the liquid, dividend-paying portion of the North American energy infrastructure market. The securities do not have a minimum payment at maturity, upon redemption or upon call and are fully exposed to any decline in the index. The payment investors receive on the securities at maturity, early redemption or upon exercise by UBS of its call right will depend on the performance of the index, as measured by the Current Principal Amount.