ETRACS MarketVector Business Development Companies Liquid Index ETN

Key Considerations

Selected risk considerations:

An investment in the ETRACS ETNs involves risks. Selected risks are summarized here, but we urge you to read the more detailed explanation of risks described in the "Risk Factors" section of the prospectus supplement for the ETRACS ETNs (the "ETRACS Prospectus"). Capitalized terms used below but not defined herein shall have the meanings attributed to them in the ETRACS Prospectus.

• You may lose some or all of your investment — The ETNs do not guarantee any return on your initial investment and are fully exposed to any decline in the level of the Index. The combined negative effect of the Accrued Tracking Fee and the Redemption Fee Amount, if applicable, will reduce your final payment. If the increase in the level of the Index, as compared to the Initial Index Level, is insufficient to offset the combined negative effect of the Accrued Tracking Fee and the Redemption Fee Amount, if applicable, over the relevant period you have held your ETNs, less any Coupon Amounts, any Stub Reference Distribution Amount and/or Adjusted Coupon Amount, as applicable, or if the Final Index Level is less than the Initial Index Level, you will lose some or all of your investment at maturity or call, or upon early redemption. In addition, Coupon Amounts, if any, will be reduced by the Accrued Tracking Fee. See “Risk Factors — You are not guaranteed any coupon payments" in the ETRACS prospectus.
• UBS Switzerland AG is not a co-obligor of the ETNs. — The ETNs are part of a series of debt ETNs entitled “Medium-Term Notes, Series B” and unlike UBS AG Exchange Traded Access ETNs (E-TRACS) issued prior to the Asset Transfer Date, which are part of a series of debt securities entitled “Medium-Term Notes, Series A” the ETNs do not benefit from the co-obligation of UBS Switzerland AG. As a result, UBS Switzerland AG is not a co-obligor of the ETNs and has no liability with respect to the ETNs. If UBS AG fails to perform and observe every covenant of the indenture to be performed or observed by UBS AG with respect to the ETNs, holders of the ETNs will have recourse only against UBS AG, and not against UBS Switzerland AG.
• Market risk — The return on the ETNs, which may be positive or negative, is linked to the return on the Index as measured by the Index Performance Ratio, and which, in turn, is affected by a variety of market and economic factors, interest rates in the markets and economic, financial, political, regulatory, judicial or other events that affect the Index constituents or the markets generally.
• Credit of issuer — The ETNs are senior unsecured debt obligations of the issuer, UBS, and are not, either directly or indirectly, an obligation of or guaranteed by any third party. Any payment to be made on the ETNs, including any payment at maturity, call or upon early redemption, depends on the ability of UBS to satisfy its obligations as they come due. As a result, the actual and perceived creditworthiness of UBS will affect the market value, if any, of the ETNs prior to maturity, call or early redemption. In addition, in the event UBS were to default on its obligations, you may not receive any amounts owed to you under the terms of the ETNs.
• You are not guaranteed a coupon payment — You will not receive a coupon payment on a Coupon Payment Date if the Reference Distribution Amount is less than the Accrued Tracking Fee. Similarly, you will not receive a Coupon Payment on a Redemption Date or the Call Settlement Date if the Adjusted Reference Distribution Amount is less than the Adjusted Tracking Fee, and in the case of a redemption, the Redemption Fee Amount. Because the amount of any Coupon Amount is uncertain and could be zero, you should not expect to receive regular periodic coupon payments.
• A trading market for the ETNs may not develop — Although the ETNs have been approved for listing, subject to official notice of issuance, on NYSE Arca a trading market for the ETNs may not develop. Certain affiliates of UBS may engage in limited purchase and resale transactions in the ETNs, although they are not required to and may stop at any time. We are not required to maintain any listing of the ETNs on NYSE Arca or any other exchange. In addition, we are not obliged to, and may not, sell the full aggregate principal amount of the ETNs shown on the cover of this prospectus supplement. We may suspend or cease sales of the ETNs at any time, at our discretion. Therefore, the liquidity of the ETNs may be limited.
• Limited performance history — The return on the ETNs is linked to the performance of the Index, which was launched on January 28, 2011. As a result, the Index has a limited performance history, and it is uncertain how the Index will perform. Estimated historical data prior to January 28, 2011 has been simulated by applying the Index’s calculation methodology to historical levels of the common stock of the business development companies included in the Index. No future performance of the Index can be predicted based on the estimated historical or the historical returns described in the prospectus supplement.
• Requirements upon early redemption — You must satisfy the requirements described herein for your redemption request to be considered, including the minimum redemption amount of at least 50,000 ETNs, unless we determine otherwise or your broker or other financial intermediary bundles your ETNs for redemption with those of other investors to reach this minimum requirement. In addition, the payment you receive upon early redemption will be reduced by the Redemption Fee Amount.
• Your redemption election is irrevocable — You will not be able to rescind your election to redeem your ETNs after your redemption notice is received by UBS. Accordingly, you will be exposed to market risk in the event market conditions change after UBS receives your offer and the Redemption Amount is determined on the Redemption Valuation Date.
• You are not guaranteed a coupon payment — You will not receive a coupon payment on a Coupon Payment Date if the Reference Distribution Amount is less than the Accrued Tracking Fee. Similarly, you will not receive a coupon payment on a Redemption Date or Call Settlement Date if the Adjusted Reference Distribution Amount is less than the Adjusted Tracking Fee and, as applicable, the Redemption Fee Amount. In addition, any Tracking Fee Shortfall will reduce the Coupon Amount, if any, for the following Coupon Valuation Date.
• Uncertain tax treatment — Significant aspects of the tax treatment of the ETNs are uncertain. You should consult your own tax advisor about your own tax situation.
• UBS's Call Right — UBS may elect to redeem all outstanding ETNs at any time on any Exchange Business Day (or if such day is not an Exchange Business Day, the next Exchange Business Day) on or after October 17, 2016, as described in the ETRACS Prospectus under the heading "Specific Terms of the ETNs - UBS's Call Right". If UBS exercises its Call Right, the Call Settlement Amount may be less than the Principal Amount of your ETNs. Alternatively, if the ETNs have increased in value, you may have to invest your proceeds in a lower-return investment.