UBS AG - Capital/Financing Update 2012

Trigger Return Optimization Securities

UBS AG

September 10, 2012

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PRODUCT SUPPLEMENT (To Prospectus dated January 11, 2012)

Product Supplement

Trigger Return Optimization Securities

Linked to Common Stock, Exchange Traded Fund Shares or a Basket of Equities

UBS AG from time to time may offer and sell Trigger Return Optimization Securities, which we refer to as Securities, linked to either (i) a common stock, including American depositary shares, of a specific company or shares of an exchange traded fund (each, an underlying equity) or (ii) a weighted basket of common stocks, including American depositary shares, and/or exchange traded funds (an underlying basket). This product supplement describes some of the general terms that may apply to the Securities and the general manner in which they may be offered. The specific terms of any Securities that we offer, including the name of the underlying equity or the several common stocks, including American depositary shares, and/or exchange traded funds (each a basket equity and together, the basket equities) comprising the underlying basket to which the return on the Securities is linked and the specific manner in which such Securities may be offered, will be described for each particular offering of the Securities in an applicable pricing supplement to this product supplement (the applicable pricing supplement). If there is any inconsistency between the terms described in the applicable pricing supplement and those described in this product supplement or in the accompanying prospectus, the terms described in the applicable pricing supplement will be controlling. Except as otherwise described in the applicable pricing supplement, the general terms of the Securities are described in this product supplement and include the following:

Issuer:

UBS AG (UBS)

Booking Branch:

The booking branch of UBS will be specified in the applicable pricing supplement.

Issue Price:

The issue price per Security will be set equal to 100% of the principal amount of each Security.

No Coupon:

We will not pay you interest during the term of the Securities, unless otherwise specified in the applicable pricing supplement.

Principal Amount:

Unless otherwise specified in the applicable pricing supplement, each Security will have a principal amount of $10.00 per Security (with a minimum investment of 100 Securities for a total of $1,000).

Payment at Maturity:

At maturity, UBS will pay a cash payment per Security that you hold, the amount of which is based on the performance of the underlying equity or underlying basket from the trade date to the final valuation date, and whether the trigger price is breached on the final valuation date, as described below:

Ø If the underlying return is positive, UBS will pay you for each Security that you hold a cash payment equal to your full principal amount plus pay an amount equal to the product of (i) your principal amount multiplied by (ii) the underlying return multiplied by (iii) a multiplier (the multiplier), up to a maximum gain (the maximum gain). The multiplier and the maximum gain on the Securities will be specified in the applicable pricing supplement.

Ø If the underlying return is zero or negative and the final price is equal to or greater than the trigger price, UBS will pay you for each Security you hold a cash payment equal to your principal amount.

Ø If the underlying return is negative and the final price is less than the trigger price, UBS will pay you for each Security you hold a cash payment that is less than your principal amount, if anything, resulting in a loss that is proportionate to the decline of the underlying equity or underlying basket from the trade date to the final valuation date, for an amount equal to: $10.00 + ($10.00 × underlying return).

Investing in the Securities involves significant risks. The Securities differ from ordinary debt securities in that UBS is not necessarily obligated to repay the full amount of your initial investment. You may lose some or all of your investment. Specifically, if the final price is less than the trigger price, you will lose 1% (or a fraction thereof) of your principal amount for each 1% (or a fraction thereof) that the underlying return is less than zero.

Any payment on the Securities, including any repayment of principal, is subject to the creditworthiness of UBS. If UBS were to default on its payment obligations, you may not receive any amounts owed to you under the Securities and you could lose your entire investment.

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Underlying Return:

The quotient, expressed as a percentage, of (i) the final price of the underlying equity or underlying basket minus the initial price of the underlying equity or underlying basket, divided by (ii) the initial price of the underlying equity or underlying basket.

Expressed as a formula:

Final Price Initial Price Initial Price

Initial Price:

The closing price of the underlying equity determined on the trade date (as may be adjusted in the case of certain adjustment events as described under General Terms of the Securities Antidilution Adjustments), or in the case of an underlying basket, 100.

Final Price:

Unless otherwise specified in the applicable pricing supplement, the final price is the closing price of the underlying equity determined on a date specified in the applicable pricing supplement, subject to adjustment upon the occurrence of a market disruption event, as described herein (the final valuation date) or, in the case of an underlying basket, a level of the underlying basket equal to the product of (i) the initial price of such underlying basket multiplied by (ii) the sum of one and the weighted performance of the basket equities on the final valuation date.

Trigger Price:

A specified price of the underlying equity that is below the initial price set forth in the applicable pricing supplement (as may be adjusted in the case of certain adjustment events as described under General Terms of the Securities Antidilution Adjustments).

No Listing:

The Securities will not be listed or displayed on any securities exchange or any electronic communications network, unless otherwise specified in the applicable pricing supplement.

Calculation Agent:

UBS Securities LLC

The applicable pricing supplement will describe the specific terms of the Securities, including any changes to the terms specified in this product supplement.

See Risk Factors beginning on page PS- 15 of this product supplement for risks related to an investment in the Securities.

To help investors identify appropriate structured products, UBS organizes its structured products into four categories: Protection Strategies, Optimization Strategies, Performance Strategies and Leverage Strategies. The Securities are classified by UBS as an Optimization Strategy for this purpose. For a more detailed description of each of the four categories, please see Structured Product Categorization beginning on page PS- 7 .

Neither the Securities and Exchange Commission nor any other regulatory body has approved or disapproved of these securities or passed upon the adequacy or accuracy of this product supplement or the accompanying prospectus. Any representation to the contrary is a criminal offense.

The Securities are not deposit liabilities of UBS AG and are not FDIC insured.

UBS Investment Bank UBS Financial Services Inc.

Product supplement dated September 10, 2012

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ADDITIONAL INFORMATION ABOUT THE TRIGGER RETURN OPTIMIZATION SECURITIES

You should read this product supplement together with the prospectus dated January 11, 2012, titled Debt Securities and Warrants, relating to our Medium-Term Notes, Series A, of which the Securities are a part, and any applicable pricing supplement related to the Securities that we may file with the Securities and Exchange Commission (SEC) from time to time. You may access these documents on the SEC website at www.sec.gov as follows (or if such address has changed, by reviewing our filings for the relevant date on the SEC website):

¨ Prospectus dated January 11, 2012: http://www.sec.gov/Archives/edgar/data/1114446/000119312512008669/d279364d424b3.htm

Our Central Index Key, or CIK, on the SEC website is 0001114446.

You should rely only on the information incorporated by reference or provided in this product supplement or the accompanying prospectus. We have not authorized anyone to provide you with different information. We are not making an offer of these Securities in any state where the offer is not permitted. You should not assume that the information in this product supplement is accurate as of any date other than the date on the front of the document.

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Product Supplement

●
Product Supplement Summary	PS-1
Hypothetical Payment Amounts on Your Securities	PS-14
Risk Factors	PS-15
General Terms of the Securities	PS-28
Use of Proceeds and Hedging	PS-45
Supplemental U.S. Tax Considerations	PS-46
ERISA Considerations	PS-52
Supplemental Plan of Distribution (Conflicts of Interest)	PS-53

Prospectus

●
Introduction	1
Cautionary Note Regarding Forward-Looking Information	3
Incorporation of Information About UBS AG	4
Where You Can Find More Information	5
Presentation of Financial Information	6
Limitations on Enforcement of U.S. Laws Against UBS AG, Its Management and Others	6
UBS	7
Use of Proceeds	9
Description of Debt Securities We May Offer	10
Description of Warrants We May Offer	30
Legal Ownership and Book-Entry Issuance	45
Considerations Relating to Indexed Securities	50
Considerations Relating to Securities Denominated or Payable in or Linked to a Non-U.S. Dollar Currency	53
U.S. Tax Considerations	55
Tax Considerations Under the Laws of Switzerland	66
Benefit Plan Investor Considerations	68
Plan of Distribution	70
Conflicts of Interest	72
Validity of the Securities	73
Experts	73

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Product Supplement Summary

This product supplement describes terms that will apply generally to the Securities. On the trade date for each offering of the Securities, UBS AG will prepare a pricing supplement that, in addition to specifying the underlying equity or underlying basket and any changes to the general terms specified below, will also include the specific pricing terms for that issuance. Any applicable pricing supplement should be read in conjunction with this product supplement and the accompanying prospectus.

References to UBS, we, our and us refer only to UBS AG and not to its consolidated subsidiaries. In this product supplement, when we refer to the Securities, we mean Trigger Return Optimization Securities. Also, references to the accompanying prospectus mean the accompanying prospectus, dated January 11, 2012, of UBS. References to the applicable pricing supplement mean the applicable pricing supplement that describes the specific terms of your Securities unless the context otherwise requires.

What Are the Trigger Return Optimization Securities?

The Trigger Return Optimization Securities (Securities) are medium-term unsubordinated and unsecured debt securities issued by UBS AG whose return is linked to the performance of (i) an underlying common stock or shares of an exchange traded fund (each, an underlying equity) or (ii) a weighted basket (an underlying basket) comprised of several common stocks and/or exchange traded funds (each a basket equity and, together, the basket equities). As used in this product supplement, the term common stock includes non-U.S. equity securities issued through depositary arrangements such as American depositary shares (ADS). We refer to the common stock represented by an ADS as foreign stock. If the underlying equity or a basket equity is an ADS, the term foreign stock issuer refers to the issuer of the foreign stock underlying the ADS. The underlying equity or underlying basket will be specified in the applicable pricing supplement to this product supplement.

Unlike ordinary debt securities, UBS will not pay periodic interest and will not necessarily pay the principal amount of the Securities at maturity. At maturity, UBS will pay an amount in cash that is based on the direction of and percentage change in the price of the underlying equity or the level of the underlying basket from the trade date to the final valuation date, referred to as the underlying return. The amount you will receive at maturity is based on the underlying return, and whether the final price of the underlying equity or underlying basket is below a specified price (the trigger price). However, in no event will the return on your Securities be greater than the maximum gain specified in the applicable pricing supplement (the maximum gain). You must be willing to risk losing up to 100% of your principal amount invested if the price of the underlying equity or the level of the underlying basket closes below the trigger price on the final valuation date. You must also be willing to accept that the Securities will not pay interest.

Unless otherwise specified in the applicable pricing supplement, at maturity UBS will pay a cash payment per Security that you hold, calculated as follows:

¨ If the underlying return is positive, UBS will pay you for each Security that you hold a cash payment equal to $10 + [$10 × (Underlying Return × Multiplier)]; provided, however, that in no event will UBS pay an amount greater than $10 + ($10 × Maximum Gain).

¨ If the underlying return is zero or negative and the final price is equal to or greater than the trigger price, UBS will pay you for each Security you hold a cash payment equal to your principal amount, or $10 per Security.

¨ If the underlying return is negative and the final price is less than the trigger price, UBS will pay you for each Security you hold a cash payment that is less than your principal amount, if anything, resulting in a loss that is proportionate to the decline of the underlying equity or underlying basket from the trade date to the final valuation date, for an amount equal to:

$10 + ($10 × Underlying Return).

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Investing in the Securities involves significant risks. The Securities differ from ordinary debt securities in that UBS is not necessarily obligated to repay the full amount of your initial investment. You may lose some or all of your investment. Specifically, if the final price is below the trigger price, you will lose 1% (or a fraction thereof) of your principal amount for each 1% (or a fraction thereof) that the underlying return is less than zero.

The multiplier and the maximum gain applicable to the Securities will be specified in the applicable pricing supplement.

The underlying return is the difference between the final price and initial price of the underlying equity or underlying basket and is expressed as a percentage of the initial price. The underlying return may be positive or negative and is calculated as follows:

Underlying Return = Final Price Initial Price

Initial Price

In the case of Securities linked to an underlying basket, the underlying return may be referred to as the basket return in the applicable pricing supplement.

The initial price is (i) with respect to an underlying equity, the closing price of the underlying equity on the trade date (as may be adjusted in the case of certain adjustment events as described under Antidilution Adjustments), and (ii) with respect to an underlying basket, 100.

The final price is (i) with respect to an underlying equity, the closing price of the underlying equity determined on the final valuation date, and (ii) with respect to an underlying basket, a level of the underlying basket equal to the product of (a) the initial price of such underlying basket multiplied by (b) the sum of one and the weighted performance of the basket equities on the final valuation date.

In the case of an offering of the Securities linked to an underlying basket, the initial price may be referred to in the applicable pricing supplement as the initial basket level and the final price may be referred to as the final basket level, or each in such other manner as may be specified in the applicable pricing supplement. Furthermore, in the case of an offering of the Securities linked to an underlying basket, in the applicable pricing supplement (i) the term initial equity price will refer to, with respect to a basket equity, the closing price of such basket equity determined on the trade date and (ii) the term final equity price will refer to, with respect to a basket equity, the closing price of such basket equity determined on the final valuation date.

The trade date and the final valuation date will be specified in the applicable pricing supplement.

The initial price and the trigger price for an underlying equity or the initial equity price for a basket equity may be adjusted in the case of certain corporate events described below under General Terms of the Securities Antidilution Adjustments.

We may issue separate offerings of the Securities that are identical in all respects, except that each offering may be linked to the performance of a different underlying equity or underlying basket and will be subject to the particular terms of the respective Securities set forth in the applicable pricing supplement. Each offering of the Securities is a separate and distinct security and you may invest in one or more offerings of the Securities as set forth in the applicable pricing supplement. The performance of each offering of the Securities will depend solely upon the performance of the underlying equity or underlying basket to which such offering is linked and will not depend on the performance of any other offering of the Securities.

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The Securities Are Part of a Series

The Securities are part of a series of debt securities entitled Medium Term Notes, Series A that we may issue from time to time under our indenture, which is described in the accompanying prospectus. This product supplement summarizes general financial and other terms that apply to the Securities. Terms that apply generally to all Medium Term Notes, Series A are described in Description of Debt Securities We May Offer in the accompanying prospectus. The terms described here ( i.e. , in this product supplement) supplement those described in the accompanying prospectus and, if the terms described here are inconsistent with those described there, the terms described here are controlling.

Specific Terms Will Be Described in Applicable Pricing Supplements

The specific terms of your Securities will be described in the applicable pricing supplement accompanying this product supplement. The terms described there modify or supplement those described here and in the accompanying prospectus. If the terms described in the applicable pricing supplement are inconsistent with those described here or in the accompanying prospectus, the terms described in the applicable pricing supplement are controlling.

Any applicable pricing supplement should be read in connection with this product supplement and the accompanying prospectus.

Selected Purchase Considerations

Subject to the specific terms of your Securities as described in the applicable pricing supplement, an investment in the Securities may offer the following features:

¨ Contingent repayment of principal amount at maturity We will pay you an amount in cash equal to the principal amount of your Securities if the final price of the underlying equity or underlying basket is at or above the trigger price and you hold the Securities to maturity, subject to the creditworthiness of UBS. If the final price of the underlying equity or underlying basket is below the trigger price, we will pay you an amount in cash that is less than the principal amount, if anything. Specifically, the payment at maturity will be reduced by an amount equal to 1% (or a fraction thereof) of the principal amount for each 1% (or a fraction thereof) that the underlying return is less than zero, and you will receive a cash amount per Security equal to: $10.00 + ($10.00 × underlying return). This will result in a loss of some or all of your initial investment in the Securities.

¨ Growth Potential At maturity, the Securities enhance the upside participation in any positive performance of the underlying equity or underlying basket up to the maximum gain specified in the applicable pricing supplement.

¨ Minimum Investment Unless otherwise specified in the applicable pricing supplement, in the case of offerings of Securities with a $10.00 principal amount per Security, the minimum investment is 100 Securities at a principal amount of $10.00 per Security (for a total minimum purchase price of $1,000). Purchases in excess of the minimum amount may be made in integrals of one Security at a principal amount of $10.00 per Security. Purchases and sales made in the secondary market, if any exists, are not subject to the minimum investment of 100 Securities.

What Are Some of the Risks of the Securities?

An investment in any Securities involves significant risks. Some of the risks that apply generally to the Securities are summarized here, but we urge you to read the more detailed explanation of risks relating to the Securities in the Risk Factors section of this product supplement and the applicable pricing supplement.

¨ Risk of loss at maturity The Securities differ from ordinary debt securities in that the issuer will not make periodic interest payments or necessarily pay the full principal amount of the Securities at maturity. UBS will only pay you the principal amount of your Securities in cash if the final price of the underlying equity or underlying basket is greater than or equal to the trigger price and will only make such payment at maturity. If the final price of the underlying equity or underlying basket is

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below the trigger price, you will lose some or all of your initial investment in an amount proportionate to the decline in the price of the underlying equity or the level of the underlying basket from the trade date to the final valuation date.

¨ The contingent repayment of principal applies only at maturity You should be willing to hold your Securities to maturity. If you are able to sell your Securities prior to maturity in the secondary market, you may have to sell them at a loss relative to your initial investment even if the price of the underlying equity or the level of the underlying basket is above the trigger price.

¨ The multiplier applies only at maturity You should be willing to hold your Securities to maturity. If you are able to sell your Securities prior to maturity in the secondary market, the price you receive will likely not reflect the full economic value of the multiplier specified in the applicable pricing supplement, or the full economic value of the Securities, and the return you realize may be less than the return of the underlying equity or the underlying basket even if such return is positive and does not exceed the maximum gain. You can receive the full benefit of the multiplier and earn the potential maximum return from UBS only if you hold your Securities to maturity.

¨ Your potential return on the Securities is limited to the maximum gain The return potential of the Securities is limited to the maximum gain. At maturity, the Securities enhance the participation in any positive underlying return, multiplied by the multiplier, but only up to the maximum gain. Therefore, you will not benefit from any positive underlying return that, when multiplied by the multiplier, exceeds the applicable maximum gain. Accordingly, the maximum gain for your Securities may cause you to earn a return that is less than the return on a direct investment in a security the return on which is based solely on the performance of the underlying equity or underlying basket over the term of the Securities without limitation.

¨ No interest payments UBS will not pay any interest with respect to the Securities.

¨ Credit risk of UBS The Securities are unsubordinated, unsecured debt obligations of the issuer, UBS, and are not, either directly or indirectly, an obligation of any third party. Any payment to be made on the Securities, including any repayment of principal, depends on the ability of UBS to satisfy its obligations as they come due. As a result, the actual and perceived creditworthiness of UBS may affect the market value of the Securities and, in the event UBS were to default on its obligations, you may not receive any amounts owed to you under the terms of the Securities and you could lose your entire initial investment.

¨ Market risk The price of the underlying equity or any basket equity can rise or fall sharply due to factors specific to that underlying equity or basket equity and the issuer of such underlying equity or basket equity or, if the underlying equity or basket equity is an exchange traded fund (an ETF), the securities, futures contracts, commodities or other assets constituting the assets of that ETF (underlying assets), such as price volatility, earnings, financial conditions, corporate, industry and regulatory developments, management changes and decisions and other events, as well as general market factors, such as general stock and commodity market volatility and levels, interest rates and economic and political conditions.

¨ Owning the Securities is not the same as owning the underlying equity or basket equities The return on your Securities may not reflect the return you would realize if you actually owned the underlying equity or basket equities. For instance, you will not receive or be entitled to receive any dividend payments or other distributions during the term of the Securities, and any such dividends or distributions will not be factored into the calculation of the payment at maturity on your Securities. In addition, as an owner of the Securities, you will not have voting rights or any other rights that a holder of the underlying equity or basket equities may have.

¨ No assurance that the investment view implicit in the Securities will be successful It is impossible to predict whether and the extent to which the price of the underlying equity or the level of the underlying basket will rise or fall. There can be no assurance that the price of the underlying equity of the level or the underlying basket will rise above the initial price or that the final price will not fall

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below the trigger price. The final price of the underlying equity or underlying basket will be influenced by complex and interrelated political, economic, financial and other factors that affect the issuer(s) of the underlying equity or basket equities or, if the underlying equity or a basket equity is an ETF, the underlying assets of that ETF. You should be willing to accept the risks of owning equities in general and the underlying equity or basket equities in particular, and the risk of losing some or all of your initial investment.

¨ The calculation agent can make adjustments that affect the payment to you at maturity For certain corporate events affecting the underlying equity or a basket equity, the calculation agent may make adjustments to (i) the initial price and the trigger price of the affected underlying equity or (ii) the initial equity price of the affected basket equity (as case may be). However, the calculation agent will not make an adjustment in response to all events that could affect the underlying equity or a basket equity. If an event occurs that does not require the calculation agent to make an adjustment, the value of the Securities may be materially and adversely affected. In addition, all determinations and calculations concerning any such adjustments will be made by the calculation agent. You should be aware that the calculation agent may make any such adjustment, determination or calculation in a manner that differs from that discussed in this product supplement or the applicable pricing supplement as necessary to achieve an equitable result. Following certain corporate events relating to the respective issuer of the underlying equity or a basket equity where such issuer is not the surviving entity, the amount you receive at maturity may be based on the common stock of a successor to the respective underlying equity issuer in combination with any cash or any other assets distributed to holders of the underlying equity or basket equity in such corporate event. If the issuer of an underlying equity or basket equity becomes subject to (i) a corporate event whereby the underlying equity or basket equity is exchanged solely for cash or (ii) a merger or combination with UBS or any of its affiliates, the amount you receive at maturity may be based on the common stock issued by another company. The occurrence of these corporate events and the consequent adjustments may materially and adversely affect the value of the Securities. For more information, see the section General Terms of the Securities Antidilution Adjustments beginning on page PS- 32 of this product supplement. Regardless of any of the events discussed above, any payment on the Securities is subject to the creditworthiness of UBS.

¨ There may be little or no secondary market for the Securities Unless otherwise specified in the applicable pricing supplement, the Securities will not be listed or displayed on any securities exchange or any electronic communications network. There can be no assurance that a secondary market for the Securities will develop. UBS Securities LLC and other affiliates of UBS may make a market in the Securities, although they are not required to do so and may stop making a market at any time. The price, if any, at which you may be able to sell your Securities prior to maturity could be at a substantial discount from the issue price and to the intrinsic value of the product; and as a result, you may suffer substantial losses.

¨ Price of Securities prior to maturity The market price of the Securities will be influenced by many unpredictable and interrelated factors, including the price of the underlying equity or level of the underlying basket; the price volatility of such underlying equity or basket equities; the dividend rate paid on the underlying equity or basket equities; the time remaining to the maturity of the Securities; interest rates in the markets; geopolitical conditions and economic, financial, political and regulatory or judicial events; and the creditworthiness of UBS.

¨ Impact of fees on the secondary market price of the Securities Generally, the price of the Securities in the secondary market is likely to be lower than the issue price to public since the issue price to public included, and the secondary market prices are likely to exclude, commissions, hedging costs or other compensation paid with respect to the Securities.

¨ Potential UBS impact on price Trading or transactions by UBS or its affiliates in the underlying equity or basket equities and/or over-the-counter options, futures or other instruments with returns

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linked to the performance of the underlying equity or basket equities, may adversely affect the market price(s) of the underlying equity or basket equities and, therefore, the market value of the Securities.

¨ Potential conflict of interest UBS and its affiliates may engage in business with the issuer of any underlying equity or basket equities, or if any underlying equity or basket equity is an ETF, the issuers of securities constituting underlying assets of that ETF, which may present a conflict between the obligations of UBS and you, as a holder of the Securities. There are also potential conflicts of interest between you and the calculation agent, which will be an affiliate of UBS.

¨ Potentially inconsistent research, opinions or recommendations by UBS UBS and its affiliates publish research from time to time on financial markets and other matters that may influence the value of the Securities, or express opinions or provide recommendations that are inconsistent with purchasing or holding the Securities. Any research, opinions or recommendations expressed by UBS or its affiliates may not be consistent with each other and may be modified from time to time without notice. Investors should make their own independent investigation of the merits of investing in the Securities and the underlying equity or underlying basket to which the Securities are linked.

¨ Dealer incentives UBS and its affiliates act in various capacities with respect to the Securities. We and our affiliates may act as a principal, agent or dealer in connection with the sale of the Securities. Such affiliates, including the sales representatives, will derive compensation from the distribution of the Securities and such compensation may serve as an incentive to sell these Securities instead of other investments. We may pay dealer compensation to any of our affiliates acting as agents or dealers in connection with the distribution of the Securities.

¨ Uncertain tax treatment Significant aspects of the tax treatment of the Securities are uncertain. You should consult your own tax advisor about your own tax situation.

Subject to the specific terms of your Securities, as specified in the applicable pricing supplement, the Securities generally may be a suitable investment for you if:

¨ You fully understand the risks inherent in an investment in the Securities, including the risk of loss of your entire initial investment.

¨ You can tolerate a loss of all or a substantial portion of your investment and are willing to make an investment that may have the same downside market risk as an investment in the underlying equity or underlying basket or the index constituents in the case of an ETF as the underlying equity.

¨ You believe the underlying equity or underlying basket will appreciate over the term of the Securities and that the appreciation is unlikely to exceed an amount equal to the maximum gain.

¨ You understand and accept that your potential return is limited to the maximum gain and you would be willing to invest in the Securities if the maximum gain was set equal to the bottom of the range for the anticipated maximum gain for such offering of the Securities (the actual maximum gain will be determined on the trade date for each offering of the Securities and will be specified in the applicable pricing supplement).

¨ You can tolerate fluctuations in the price of the Securities prior to maturity that may be similar to or exceed the downside fluctuations in the price of the underlying equity or the level of the underlying basket.

¨ You do not seek current income from your investment and are willing to forego dividends paid on any underlying equity or basket equities.

¨ You are willing to hold the Securities to maturity and accept that there may be little or no secondary market for the Securities.

¨ You are willing to assume the credit risk of UBS for all payments under the Securities, and understand that if UBS defaults on its obligations you may not receive any amounts due to you including any repayment of principal.

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Subject to the specific terms of your Securities, as specified in the applicable pricing supplement, the Securities generally may not be a suitable investment for you if:

¨ You do not fully understand the risks inherent in an investment in the Securities, including the risk of loss of your entire initial investment.

¨ You require an investment designed to provide a full return of principal at maturity.

¨ You are not willing to make an investment that may have the same downside market risk as an investment in the underlying equity or underlying basket.

¨ You believe that the price of the underlying equity or the level of the underlying basket will decline during the term of the Securities and is likely to close below the trigger price on the final valuation date, or you believe the underlying equity or underlying basket will appreciate over the term of the Securities by more than an amount equal to the maximum gain.

¨ You seek an investment that has unlimited return potential without a cap on appreciation.

¨ You cannot tolerate fluctuations in the price of the Securities prior to maturity that may be similar to or exceed the downside fluctuations in the price of the underlying equity or the level of the underlying basket.

¨ You seek current income from this investment or prefer to receive the dividends paid on the underlying equity or basket equities.

¨ You are unable or unwilling to hold the Securities to maturity or you seek an investment for which there will be an active secondary market.

¨ You are not willing to assume the credit risk of UBS for all payments under the Securities.

The suitability considerations identified above are not exhaustive. Whether or not the Securities are a suitable investment for you will depend on your individual circumstances, and you should reach an investment decision only after you and your investment, legal, tax, accounting, and other advisers have carefully considered the suitability of an investment in the Securities in light of your particular circumstances. You should also review carefully the Risk Factors on page PS- 15 of this product supplement.

Structured Product Categorization

To help investors identify appropriate structured products, UBS organizes its structured products, including the securities offered hereby, into four categories: Protection Strategies, Optimization Strategies, Performance Strategies and Leverage Strategies. The Securities are classified by UBS as an Optimization Strategy for this purpose. The description below is intended to describe generally the four categories of structured products and the types of principal repayment features, if any, which may be offered on those products. This description should not be relied upon as a description of any particular structured product.

¨ Protection Strategies are structured to complement and provide the potential to outperform traditional fixed income instruments. These structured products are generally designed for investors with low to moderate risk tolerances.

¨ Optimization Strategies provide the opportunity to enhance market returns or yields and can be structured with full downside market exposure or with buffered or contingent downside market exposure. These structured products are generally designed for investors who can tolerate downside market risk

¨ Performance Strategies provide efficient access to markets and can be structured with full downside market exposure or with buffered or contingent downside market exposure. These structured products are generally designed for investors who can tolerate downside market risk.

¨ Leverage Strategies provide leveraged exposure to the performance of an underlying asset. These structured products are generally designed for investors with high risk tolerances.

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In order to benefit from any type of limited market exposure, investors must hold the security to maturity.

Classification of structured products into categories is not intended to guarantee particular results or performance.

What Are the Tax Consequences of the Securities?

The United States federal income tax consequences of your investment in the Securities are uncertain. Some of these tax consequences are summarized below, but we urge you to read the more detailed discussion in Supplemental U.S. Tax Considerations on page PS- 46 and discuss the tax consequences of your particular situation with your tax advisor.

Pursuant to the terms of the Securities, UBS and you agree, in the absence of a statutory, regulatory, administrative or judicial ruling to the contrary, to characterize your Securities as a pre-paid derivative contract with respect to the underlying equity or underlying basket. If your Securities are so treated, subject to the discussion below with respect to constructive ownership and passive foreign investment companies (PFICs), you should generally not accrue any income with respect to the underlying equity or underlying basket and you should generally recognize capital gain or loss upon the sale or maturity of your Securities in an amount equal to the difference between the amount you receive at such time and the amount you paid for your Securities. Such gain or loss should generally be long term capital gain or loss if you have held your Securities for more than one year.

In the opinion of our counsel, Cadwalader, Wickersham & Taft LLP, it would be reasonable to treat your Securities in the manner described above. However, because there is no authority that specifically addresses the tax treatment of the Securities, it is possible that your Securities could alternatively be treated for tax purposes in the manner described under Supplemental U.S. Tax Considerations Alternative Treatments on page PS- 48 .

A constructive ownership transaction includes a contract under which an investor will receive payment equal to or credit for the future value of any equity interest in a regulated investment company (such as the shares of an underlying ETF) a PFIC or other pass thru entity. Under the constructive ownership transaction rules, if an investment in securities is treated as a constructive ownership transaction, any long-term capital gain recognized by a U.S. holder (as defined under Supplemental U.S. Tax Consideration on page PS- 46 ) in respect of a security will be recharacterized as ordinary income to the extent such gain exceeds the amount of net underlying long-term capital gain (as defined in Section 1260 of the Internal Revenue Code of 1986, as amended (the Code)) of the U.S. holder (the Excess Gain). In addition, an interest charge will also apply to any deemed underpayment of tax in respect of any Excess Gain to the extent such gain would have resulted in gross income inclusion for the U.S. holder in taxable years prior to the taxable year of the sale, exchange or maturity of the security (assuming such income accrued such that the amount in each successor year is equal to the income of the prior year increased at a constant rate equal to the applicable federal rate as of the date of sale, exchange or maturity of the security).

Although the matter is not clear, there exists a risk that an investment in Securities that are linked to shares of an ETF, PFIC or other pass thru entity or a weighted basket that contains shares in an ETF, PFIC or other pass thru entity will be treated as a constructive ownership transaction. If such treatment applies, it is not entirely clear to what extent any long-term capital gain recognized by a U.S. holder in respect of a Security will be recharacterized as ordinary income. Moreover, because the U.S. holder does not share in distributions made on ETFs, PFICs, or other pass thru entities or baskets of ETFs, PFICs or other pass thru entities referenced by the Securities, such distributions should be excluded from the calculation of the amount and character of gain, if any, that would have been realized had the U.S. holder held the shares of ETFs PFICs, or other pass thru entities directly. Accordingly, U.S. holders should consult their tax advisors regarding the potential application of the constructive ownership rules.

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We will not attempt to ascertain whether the issuer of any stock included in an underlying basket owned by an ETF included in an underlying basket would be treated as a PFIC within the meaning of Section 1297 of the Code. In the event that the issuer of any stock included in a basket owned by one or more ETFs included in a basket were treated as a PFIC, certain adverse U.S. federal income tax consequences might apply. You should consult your tax advisor regarding the possible consequences to you in the event that one or more issuers of stock included in an underlying basket or owned by your ETF included in an underlying basket is or become a passive foreign investment company.

The Internal Revenue Service has released a notice that may affect the taxation of holders of the Securities. According to the notice, the Internal Revenue Service and the Treasury Department are actively considering whether the holder of an instrument such as the Securities should be required to accrue ordinary income on a current basis, and they are seeking taxpayer comments on the subject. It is not possible to determine what guidance they will ultimately issue, if any. It is possible, however, that under such guidance, holders of the Securities will ultimately be required to accrue income currently and this could be applied on a retroactive basis. The Internal Revenue Service and the Treasury Department are also considering other relevant issues, including whether additional gain or loss from such instruments should be treated as ordinary or capital, whether foreign holders of such instruments should be subject to withholding tax on any deemed income accruals, and whether the special constructive ownership rules described above should be applied to such instruments. Holders are urged to consult their tax advisors concerning the significance, and the potential impact, of the above considerations. Except to the extent otherwise required by law, UBS intends to treat your Securities for United States federal income tax purposes in accordance with the treatment described above and under Supplemental U.S. Tax Considerations on page PS- 46 unless and until such time as the Treasury Department and Internal Revenue Service determine that some other treatment is more appropriate.

Moreover, in 2007, legislation was introduced in Congress that, if it had been enacted, would have required holders of Securities purchased after the bill was enacted to accrue interest income over the term of the Securities despite the fact that there will be no interest payments over the term of the Securities. It is not possible to predict whether a similar or identical bill will be enacted in the future, or whether any such bill would affect the tax treatment of your Securities.

Non-U.S. Holders

Section 871(m) of the Internal Revenue Code requires withholding (up to 30%, depending on whether a treaty applies) on certain financial instruments to the extent that the payments or deemed payments on the financial instruments are contingent upon or determined by reference to U.S.-source dividends. Under proposed U.S. Treasury Department regulations, certain payments that are contingent upon or determined by reference to U.S.-source dividends, including payments or adjustments for extraordinary dividends, with respect to equity-linked instruments, including the Securities, may be treated as dividend equivalents that are subject to U.S. withholding tax. If enacted in their current form, the regulations may impose a withholding tax on payments made on the Securities on or after January 1, 2014 that are treated as dividend equivalents. In that case, we (or the applicable withholding agent) would be entitled to withhold taxes without being required to pay any additional amounts with respect to amounts so withheld. Further, Non-U.S. Holders may be required to provide certifications prior to, or upon the sale, redemption or maturity of the Securities in order to minimize or avoid U.S. withholding taxes.

What Are the Steps to Calculate Payment at Maturity?

Set forth below is an explanation of the steps necessary to calculate the payment at maturity on the Securities, followed by examples for five hypothetical Securities, four based on the performance of a single underlying equity and one based on the performance of an underlying basket.

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Step 1: Calculate the Underlying Return

Calculate the Underlying Return for an Underlying Equity

Where the payment at maturity is based on the performance of a single underlying equity, the underlying return is the difference between the final price and initial price of the underlying equity and is expressed as a percentage of the initial price. The underlying return may be positive or negative and is calculated as follows:

Underlying Return = Final Price Initial Price

Initial Price

The initial price is the closing price of the underlying equity determined on the trade date.

The final price is the closing price of the underlying equity determined on the final valuation date.

Calculate the Underlying Return for an Underlying Basket comprised of three Basket Equities.

Where the payment at maturity is based on the performance of an underlying basket, the underlying return is the difference between the final price and initial price of the underlying basket and is expressed as a percentage of the initial price. The underlying return may be positive or negative and is calculated as follows:

Underlying Return = Final Price Initial Price

Initial Price

The initial price is 100, unless otherwise specified in the applicable pricing supplement.

The final price will be calculated on the final valuation date as follows:

100 × (1 + (W BE1 × BER 1 ) + (W BE2 × BER 2 ) + (W BE3 × BER 3 ))

where

W is the respective weighting of each basket equity ( i.e. , BE 1 , BE 2 and BE 3 ) in the underlying basket, expressed as a percentage, and

BER is the respective equity return for each basket equity ( i.e. , BE 1 , BE 2 and BE 3 ) calculated in the same manner described above under Calculate the Underlying Return for an Underlying Equity .

Step 2: Calculate the Cash Payment at Maturity

Unless otherwise specified in the applicable pricing supplement, at maturity UBS will pay a cash payment per Security that you hold, calculated as follows:

¨ If the underlying return is positive, UBS will pay you for each Security that you hold a cash payment at maturity equal to the lesser of:

$10 + [$10 × (Underlying Return × Multiplier)]; and $10 + ($10 × Maximum Gain).

$10 + ($10 × Underlying Return).

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some or all of your investment. Specifically, if the final price is below the trigger price, you will lose 1% (or a fraction thereof) of your principal amount for each 1% (or a fraction thereof) that the underlying return is less than zero.

Hypothetical examples of how the Securities perform

The examples below are provided for illustrative purposes only and are purely hypothetical. They do not purport to be representative of every possible scenario concerning increases or decreases in the final price of the underlying equity or underlying basket relative to the initial price. We cannot predict the final price of the underlying equity or underlying basket. You should not take these examples as an indication or assurance of the expected performance of the underlying equity or underlying basket.

Example 1 The Underlying Return is 5%

The following example illustrates the calculation of the underlying return and the payment at maturity for a hypothetical Security linked to a single underlying equity with the following assumptions (actual terms for the Securities will be specified in the applicable pricing supplement):

●	●
Maximum Gain	15%
Multiplier	2
Trigger Price	$112 (80% of the Initial Price)
Initial Price	$140
Final Price	$147

Given the above assumptions, the underlying return would be calculated as follows:

Underlying Return = Final Price Initial Price Initial Price = $147 $140 $140 = 5%

Given an underlying return of 5% and assuming a multiplier of 2, the payment at maturity would be:

$10 + [$10 × (Underlying Return × Multiplier)] = $10 + [$10 × (5% × 2)] = $11 per Security (a return of 10%).

Example 2 The Underlying Return is -5%

●	●
Maximum Gain	15%
Multiplier	2
Trigger Price	$112 (80% of the Initial Price)
Initial Price	$140
Final Price	$133

Given the above assumptions, the underlying return would be calculated as follows:

Underlying Return = Final Price Initial Price Initial Price = $133 $140 $140 = -5%

Since the underlying return is negative and the final price was greater than the trigger price, the payment at maturity would be $10 per Security (a return of 0%).

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Example 3 The Underlying Return is 20%

●	●
Maximum Gain	15%
Multiplier	2
Trigger Price	$112 (80% of the Initial Price)
Initial Price	$140
Final Price	$168

Given the above assumptions, the underlying return would be calculated as follows:

Underlying Return = Final Price Initial Price Initial Price = $168 $140 $140 = 20%

Since the underlying return multiplied by the multiplier is greater than the maximum gain, the payment at maturity would be $11.50 per Security (a return equal to the maximum gain of 15%).

Example 4 The Underlying Return is -50%

●	●
Maximum Gain	15%
Multiplier	2
Trigger Price	$112 (80% of the Initial Price)
Initial Price	$140
Final Price	$70

Given the above assumptions, the underlying return would be calculated as follows:

Underlying Return = Final Price Initial Price Initial Price = $70 $140 $140 = -50%

Since the underlying return at maturity is negative and the final price was less than the trigger price, the investor is fully exposed to the decline of the underlying equity. In this example, the final payment is calculated as follows:

$10 + ($10 × -50%) = $10 $5 = $5 per Security (a loss of 50%)

Accordingly, if the underlying return is negative and the final price is below the Trigger Price, you will lose some or all your principal.

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Example 5 The Basket Return is 6.5%

The following example illustrates the calculation of the underlying return and the payment at maturity for a hypothetical Security based on an underlying basket comprised of three basket equities with the following assumptions (actual terms for the Securities will be specified in the applicable pricing supplement):

●	●	●
Basket Equity	Equity Weight	Equity Return
A	50%	10%
B	30%	-5%
C	20%	15%

●	●
Maximum Gain	15%
Multiplier	2
Initial Price	100
Trigger Price	80 (80% of initial price)

Given the above assumptions, the final price would be calculated as follows:

Final Price = 100 × (1 + (A equity weight × A equity return) +

(B equity weight × B equity return) +

(C equity weight × C equity return))

= 100 × (1 + (50% × 10%) + (30% × -5%) + (20% × 15%)) = 106.5

The underlying return is then calculated as follows:

Underlying Return = Final Price Initial Price Initial Price = 106.5 100 100 = 6.5%

Given an underlying return of 6.5% and assuming a multiplier of 2, the payment at maturity would be:

$10 + [$10 × (Underlying Return × Multiplier)] = $10 + [$10 × (6.5% × 2)] = $11.30 per Security (a gain of 13%).

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Hypothetical Payment Amounts on Your Securities

The applicable pricing supplement may include hypothetical calculations and tables or charts showing hypothetical examples of the performance of your Securities at maturity and the cash payment that could be delivered for each of your Securities on the stated maturity date based on a range of hypothetical initial prices or final prices and on various key assumptions shown in the applicable pricing supplement.

Any table, chart or calculation showing hypothetical payment amounts will be provided for purposes of illustration only. It should not be viewed as an indication or prediction of future investment results. Rather, it is intended merely to illustrate the impact that various hypothetical market prices of the underlying equity or levels of the underlying basket on the final valuation date, could have on your payment at maturity, as calculated in the manner described in the applicable pricing supplement. Such hypothetical table, chart or calculation will be based on market prices for the underlying equity or levels of the underlying basket that may not be achieved on the final valuation date and on assumptions regarding terms of the Securities that will not be set until the trade date.

As calculated in the applicable pricing supplement, the hypothetical payment amounts on your Securities on the stated maturity date may bear little or no relationship to the actual market value of your Securities on that date or at any other time, including any time over the term of the Securities that you might wish to sell your Securities. In addition, you should not view the hypothetical payment amounts as an indication of the possible financial return on an investment in your Securities, since the financial return will be affected by various factors, including taxes, which the hypothetical information does not take into account. Moreover, whatever the financial return on your Securities might be, it may bear little relation to and may be much less than the financial return that you might achieve were you to invest directly in the underlying equity or the basket equities. The following factors, among others, may cause the financial return on your Securities to differ from the financial return you would receive by investing directly in the underlying equity or basket equities:

¨ the return on such a direct investment would depend primarily upon the relative appreciation or depreciation of the underlying equity or underlying basket during the term of the Securities, and not on whether the final price of the underlying equity or underlying basket is less than the trigger price;

¨ the return on such a direct investment would not be limited by the maximum gain or otherwise capped;

¨ in the case of a direct investment in the underlying equity or basket equities, the return could include substantial dividend payments, which you will not receive as an investor in the Securities; and

¨ an investment directly in the underlying equity or basket equities is likely to have tax consequences that are different from an investment in the Securities.

We describe various risk factors that may affect the market value of the Securities, and the unpredictable nature of that market value, under Risk Factors beginning on page PS- 15 of this product supplement.

We cannot predict the prices of the underlying equity or basket equities or, therefore, whether the final price of the underlying equity or underlying basket for any particular offering of the Securities will be below the trigger price. Moreover, the assumptions we make in connection with any hypothetical information in the applicable pricing supplement may not reflect actual events. Consequently, that information may give little or no indication of the payment amount that will be delivered in respect of your Securities on the stated maturity date, nor should it be viewed as an indication of the financial return on your Securities or of how that return might compare to the financial return if you were to invest directly in the underlying equity or the basket equities.

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Risk Factors

The return on the Securities is linked to the performance of the underlying equity or underlying basket and will depend on whether the underlying return is positive or negative and, if negative whether the final price is below the trigger price. Investing in the Securities is not equivalent to a direct investment in the underlying equity or basket equities. This section describes the most significant risks relating to the Securities. We urge you to read the following information about these risks, together with the other information in this product supplement, the accompanying prospectus and the applicable pricing supplement, before investing in the Securities.

The Securities do not guarantee any return of principal at maturity. You may lose some or all of your initial investment in the Securities.

The Securities differ from ordinary debt securities in that we will not pay you interest on the Securities or necessarily pay the full principal amount of the Securities at maturity. If the final price of the underlying equity or underlying basket is below the trigger price, we will pay you an amount in cash that is less than your principal amount, if anything, and you will have a loss of your initial investment that is proportionate to the negative underlying return. Specifically, in such case, the payment at maturity will be reduced by an amount equal to 1% (or a fraction thereof) of your principal amount for every 1% (or a fraction thereof) that the underlying return is less than zero. Therefore, you may lose some or all of your initial investment in the Securities.

The contingent repayment of principal applies only at maturity.

You should be willing to hold your Securities to maturity. If you are able to sell your Securities prior to maturity in the secondary market, you may have to sell them at a loss relative to your initial investment even if the price of the underlying equity or the level of the underlying basket is above the trigger price.

The multiplier applies only at maturity.

You should be willing to hold your Securities to maturity. If you are able to sell your Securities prior to maturity in the secondary market, the price you receive will likely not reflect the full economic value of the multiplier specified in the applicable pricing supplement, or the full economic value of the Securities, and the return you realize may be less than the return of the underlying equity or the underlying basket even if such return is positive and does not exceed the maximum gain. You can receive the full benefit of the multiplier and earn the potential maximum return from UBS only if you hold your Securities to maturity.

Your return potential is limited by the maximum gain on the Securities at maturity.

Your payment at maturity is based on the underlying return, which, if positive, will be multiplied by a multiplier, but is limited to the maximum gain on the Securities at maturity. Since the maximum payment amount on the Securities is capped, you will not benefit from a positive underlying return that, when multiplied by the multiplier, exceeds the maximum gain. As a result, the Securities do not offer full participation in the positive appreciation of the underlying equity or underlying basket.

Accordingly, the maximum gain for your Securities may cause you to earn a return that is less than the return on a direct investment in a security the return on which is based solely on the performance of the underlying equity or underlying basket over the term of the Securities without limitation.

You will not receive interest payments on the Securities or dividend payments on the underlying equity or the basket equities.

You will not receive any periodic interest payments on the Securities and you will not receive any dividend payments or other distributions on the underlying equity or any basket equity.

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Risk Factors

Any payment on the Securities is subject to the creditworthiness of UBS.

The Securities are unsubordinated, unsecured debt obligations of the issuer, UBS, and are not, either directly or indirectly, an obligation of any third party. Any payment to be made on the Securities, including any repayment of principal at maturity, depends on the ability of UBS to satisfy its obligations as they come due. As a result, the actual and perceived creditworthiness of UBS may affect the market value of the Securities and, in the event UBS were to default on its obligations, you may not receive any amounts owed to you under the terms of the Securities and you could lose your entire initial investment.

Owning the Securities is not the same as owning the underlying equity or the basket equities.

The return on your Securities will not reflect the return you would realize if you actually owned the underlying equity or the basket equities and held such investment for a similar period because:

¨ the return on such a direct investment would not be limited by the maximum gain or otherwise capped;

¨ an investment directly in the underlying equity or basket equities is likely to have tax consequences that are different from an investment in the Securities.

If the underlying return exceeds an amount equal to the applicable maximum gain, your return on the Securities at maturity will be less than the return on a direct investment in the underlying equity or basket equities without taking into account taxes and other costs related to such a direct investment.

Even if the price of the underlying equity or the value of the underlying basket increases above the initial price during the term of the Securities, the market value of the Securities may not increase by the same amount. It is also possible for the price of the underlying equity or the value of the underlying basket to increase while the market value of the Securities declines.

No assurance that the investment view implicit in the Securities will be successful.

It is impossible to predict whether and the extent to which the price of the underlying equity or the level of the underlying basket will rise or fall. There can be no assurance that the price of the underlying equity or the level of the underlying basket will rise above the initial price or that the final price will not fall below the trigger price. The final price of the underlying equity or underlying basket will be influenced by complex and interrelated political, economic, financial and other factors that affect the issuer(s) of the underlying equity or basket equities or, if the underlying equity or a basket equity is an ETF, any securities constituting assets of that ETF. You should be willing to accept the risks of owning equities in general and the underlying equity or basket equities in particular, and the risk of losing some or all of your initial investment.

The formula for calculating the payment at maturity of the Securities does not take into account all developments in the underlying equity or the basket equities.

Changes in the price(s) of the underlying equity or basket equities during the term of the Securities before the final valuation date specified in the applicable pricing supplement may not be reflected in the calculation of the amount payable, if any, at maturity of the Securities. The calculation agent will calculate the payment at maturity by comparing only the closing price of the underlying equity or the level of the underlying basket on the trade date relative to the closing price of the underlying equity or

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Risk Factors

the level of the underlying basket on the final valuation date. No other prices or levels will be taken into account. As a result, you may lose some or all of your investment even if the price of the underlying equity or level of the underlying basket has risen at certain times during the term of the Securities before falling to a price or level, as applicable, below its initial price on the final valuation date.

If the Securities are linked to an underlying basket, changes in the prices of the basket equities may offset each other.

If the Securities are linked to an underlying basket, the return on the Securities will be linked to a weighted basket comprised of the basket equities. While the prices of some basket equities may increase over the term of the Securities, the prices of other basket equities may not increase during the term of the Securities as much or may even decline. Therefore, in determining whether the final price of the underlying basket is less than the trigger price and in calculating the underlying return and the payment at maturity on the Securities, increases in the prices of one or more of the basket equities may be moderated, or offset, by lesser increases or declines in the prices of one or more of the other basket equities. This affect is further amplified by differing weights of the basket equities. More heavily weighted basket equities will have a larger impact on the underlying return than basket equities with lesser weightings.

You have limited antidilution protection.

For certain corporate events affecting the underlying equity or a basket equity, the calculation agent may make adjustments to (i) the initial price and the trigger price of the affected underlying equity or (ii) the initial equity price of the affected basket equity (as case may be). However, the calculation agent is not required to make an adjustment for every corporate event that can affect the underlying equity or a basket equity. For example, the calculation agent is not required to make any adjustments if the issuer of the underlying equity or a basket equity, or anyone else makes a partial tender offer or a partial exchange offer for that underlying equity or basket equity. If an event occurs that does not require the calculation agent to make an adjustment, the value of the Securities may be materially and adversely affected. In addition, all determinations and calculations concerning any such adjustment will be made by the calculation agent. You should be aware that the calculation agent may make any such adjustment, determination or calculation in a manner that differs from, or that is in addition to, that described in this product supplement or the applicable pricing supplement as necessary to achieve an equitable result. You should refer to General Terms of the Securities Antidilution Adjustments on page PS- 32 and General Terms of the Securities Role of Calculation Agent on page PS- 44 for a description of the items that the calculation agent is responsible for determining.

In some circumstances, the payment you receive on the Securities may be based on securities issued by a different company and not on the original underlying equity or basket equities.

If the underlying equity or a basket equity is common stock of a specific company (an underlying stock), following certain corporate events relating to the respective underlying equity issuer where such issuer is not the surviving entity, the amount you receive at maturity may be based on the common stock of a successor to the respective underlying equity issuer in combination with any cash or any other assets distributed to holders of the applicable underlying equity or basket equity in such corporate event, which may include securities issued by a non-U.S. company and quoted and traded in a foreign currency. If the issuer of any underlying stock becomes subject to (i) a reorganization event (as defined herein) and the relevant distribution property (as defined herein) consists solely of cash or (ii) a merger or combination with UBS or any of its affiliates, the underlying stock may be replaced with the common stock issued by another company selected by the calculation agent. The occurrence of these corporate events and the consequent adjustments may materially and adversely affect the value of the Securities. We describe the specific corporate events that may lead to these adjustments and the procedures for selecting distribution

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Risk Factors

property or a substitute security in the section of this product supplement called General Terms of Securities Antidilution Adjustments Reorganization Events. The calculation agent will make any such adjustments in order to achieve an equitable result.

If the underlying equity or a basket equity is an ADS and the ADS is no longer listed or admitted to trading on a U.S. securities exchange registered under the Securities Exchange Act of 1934, as amended (the Exchange Act) nor included in the OTC Bulletin Board Service operated by the Financial Industry Regulation Authority, Inc. (FINRA), or if the ADS facility between the foreign stock issuer and the ADS depositary is terminated for any reason, the amount you receive at maturity will be based on the common stock represented by the ADS. Such delisting of the ADS or termination of the ADS facility and the consequent adjustments may materially and adversely affect the value of the Securities. We describe such delisting of the ADS or termination of the ADS facility and the consequent adjustments in the section of this product supplement called General Terms of the Securities Delisting of ADSs or Termination of ADS Facility.

If either a common stock or an ETF that is serving as the underlying equity or a basket equity is discontinued, delisted or trading of the underlying equity or basket equity is suspended, the amount you receive at maturity may be based on a security issued by another company or in the case of an ETF, a share of another exchange traded fund or a basket of securities, futures contracts, commodities or other assets, and not the underlying equity or basket equity. Such delisting or suspension of trading of the underlying equity or basket equity and the consequent adjustments may materially and adversely affect the value of the Securities. We describe such discontinuance, delisting or suspension of trading of the underlying equity or a basket equity and the consequent adjustments in the sections of this product supplement called General Terms of the Securities Delisting or Suspension of Trading of an Underlying Stock and General Terms of the Securities Delisting, Discontinuance or Modification of an ETF.

The calculation agent can postpone the determination of the final price, and therefore the maturity date, if a market disruption event occurs on the final valuation date.

The determination of the final price may be postponed with respect to an underlying equity or a basket equity if the calculation agent determines that a market disruption event has occurred or is continuing with respect to such underlying equity or basket equity on the final valuation date. If such a postponement occurs, the calculation agent will determine the final price by reference to the closing price of the underlying equity or affected basket equity on the first trading day on which no market disruption event occurs or is continuing with respect to such underlying equity or affected basket equity. In no event, however, will the final valuation date be postponed by more than eight trading days. As a result, the maturity date for the Securities could also be postponed, although not by more than eight trading days.

If the determination of the closing price of the underlying equity or affected basket equity on the final valuation date is postponed to the last possible day, but a market disruption event occurs or is continuing with respect to such underlying equity or basket equity on that day, that day will nevertheless be the date on which the final price will be determined by the calculation agent. In such an event, the calculation agent will make an estimate of the final price that would have prevailed in the absence of the market disruption event. See General Terms of the Securities Market Disruption Event.

RISKS RELATED TO LIQUIDITY AND SECONDARY MARKET ISSUES

There may not be an active trading market in the Securities Sales in the secondary market may result in significant losses.

You should be willing to hold your Securities to maturity. There may be little or no secondary market for the Securities. The Securities will not be listed or displayed on any securities exchange or any electronic communications network. UBS Securities LLC and other affiliates of UBS may make a market for the

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Risk Factors

Securities, although they are not required to do so. UBS Securities LLC or any other affiliate of UBS may stop any such market-making activities at any time.

If you sell your Securities before maturity, you may have to do so at a substantial discount from the issue price to public, and as a result, you may suffer substantial losses, even in cases where the price of the underlying equity has risen since the trade date. The potential returns described in the applicable pricing supplement are possible only in the case that you hold your Securities to maturity.

The market value of the Securities may be influenced by unpredictable factors.

The market value of your Securities may fluctuate between the date you purchase them and the final valuation date, when the calculation agent will determine your payment at maturity. Several factors, many of which are beyond our control and interrelate in complex and unpredictable ways, will influence the market value of the Securities. Generally, we expect that the price of the underlying equity or the level of the underlying basket on any day will affect the market value of the Securities more than any other single factor. Other factors that may influence the market value of the Securities include:

¨ the volatility of the underlying equity or basket equities ( i.e. , the frequency and magnitude of changes in the price of the underlying equity or basket equities over the term of the Securities);

¨ the dividend rate paid on the underlying equity or basket equities (while not paid to holders of the Securities, dividend payments on the underlying equity or the basket equities may influence the value of the Securities);

¨ interest rates in the U.S. market and each market related to the underlying equity or basket equities;

¨ the time remaining to the maturity of the Securities;

¨ supply and demand for the Securities, including inventory positions with UBS Securities LLC or any other market-maker;

¨ if the underlying equity or a basket equity is an ADS, the exchange rate and volatility of the exchange rate between the U.S. dollar and the currency of the country in which the foreign stock is traded;

¨ if the underlying equity or a basket equity is an ETF that invests in securities, futures contracts or commodities that are traded in non-U.S. markets, or if the underlying equity or a basket equity is substituted or replaced by a security that is quoted and traded in a foreign currency, the exchange rate and volatility of the exchange rate between the U.S. dollar and the currency of the country in which such securities are traded;

¨ if the underlying equity or a basket equity is an ETF, the fact that the ETF is subject to management risk, which is the risk that the investment strategy employed by a funds investment advisor may not produce the intended results;

¨ the creditworthiness of UBS; and

¨ geopolitical, economic, financial, political, regulatory, judicial, force majeure or other events that affect the price(s) of the underlying equity or basket equities and equity and commodity markets generally.

These factors interrelate in complex and unpredictable ways, and the effect of one factor on the market value of your Securities may offset or enhance the effect of another factor.

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Risk Factors

The inclusion of commissions and compensation in the original issue price of the Securities is likely to adversely affect secondary market prices of the Securities.

Assuming no change in market conditions or any other relevant factors, the price, if any, at which UBS Securities LLC or its affiliates (or any third party market maker) are willing to purchase the Securities in secondary market transactions will likely be lower than the original issue price, since the issue price is likely to include, and secondary market prices are likely to exclude, commissions or other compensation paid with respect to, or embedded profit in, the Securities. In addition, any such prices may differ from values determined by pricing models used by UBS Securities LLC or its affiliates, as a result of dealer discounts, mark-ups or other transactions.

RISKS RELATED TO GENERAL CHARACTERISTICS OF THE UNDERLYING EQUITY OR BASKET EQUITIES

The respective issuer of the underlying equity or a basket equity and thus the underlying equity or basket equity is subject to various market risks.

The respective issuer of the underlying equity or a basket equity (each, an underlying equity issuer) or, if the underlying equity or basket equity is an ETF, each company whose securities constitute underlying assets of the ETF or each futures contract or commodity that constitutes underlying assets of the ETF, are subject to various market risks. Consequently, the price of the underlying equity or basket equity may fluctuate depending on the respective markets in which the respective underlying equity issuer operates. Market forces outside of our control could cause the final price of the underlying equity or underlying basket to fall below the trigger price. The price of each underlying equity or basket equity can rise or fall sharply due to factors specific to that underlying equity or basket equity and the corresponding underlying equity issuer, such as price volatility, earnings, financial conditions, corporate, industry and regulatory developments, management changes and decisions, and other events, and by general market factors, such as general equity or commodity market volatility and levels, interest rates and economic and political conditions. The applicable pricing supplement will provide a brief description of the underlying equity issuer(s) of the underlying equity or basket equities to which the Securities we offer are linked. We urge you to review financial and other information filed periodically by the underlying equity issuer(s) with the Securities and Exchange Commission (SEC).

UBS and its affiliates have no affiliation with any underlying equity issuers and are not responsible for their public disclosure of information, whether contained in SEC filings or otherwise.

Unless otherwise specified in the applicable pricing supplement, we and our affiliates are not affiliated with any underlying equity issuer in respect of the underlying equity or any basket equity and have no ability to control or predict their actions, including any corporate actions of the type that would require the calculation agent to adjust the payment to you at maturity, and have no ability to control the public disclosure of these corporate actions or any events or circumstances affecting an underlying equity issuer. The underlying equity issuers are not involved in the offering of the Securities in any way and have no obligation to consider your interests as owner of the Securities in taking any corporate actions that might affect the market value of your Securities or your payment at maturity. An underlying equity issuer may take actions that could adversely affect the market value of the Securities.

The Securities are unsecured debt obligations of UBS only and are not obligations of any underlying equity issuer. None of the issue price you pay for the Securities will go to any underlying equity issuer.

Unless otherwise specified in the applicable pricing supplement, we have derived the information about the respective underlying equity issuer(s) and the underlying equity or basket equities from publicly available information, without independent verification. Neither we nor any of our affiliates have undertaken any independent review or due diligence of publically available information regarding any

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underlying equity issuer or the underlying equities. You, as an investor in the Securities, should make your own investigation into the respective underlying equity issuer(s) and the underlying equity or basket equities for your Securities. We urge you to review financial and other information filed periodically by the underlying equity issuer(s) with the SEC.

This product supplement relates only to the Securities and does not relate to the underlying equity or basket equities or any underlying equity issuer.

Historical performance of the underlying equity or the basket equities should not be taken as an indication of the future performance of the underlying equity or basket equities during the term of the Securities.

The historical performance of the underlying equity or the basket equities should not be taken as an indication of the future performance of such underlying equity or basket equities. As a result, it is impossible to predict whether the price of the underlying equity or a basket equity will rise or fall. The closing price(s) of the underlying equity or the basket equities will be influenced by complex and interrelated political, economic, financial, judicial, force majeure and other factors that can affect the respective underlying equity issuers and the market price(s) of the underlying equity or the basket equities.

Moreover, any underlying basket to which any Securities may be linked does not have a recognized market value and no historical performance data will be available. The closing prices of the basket equities will determine the level of the underlying basket.

An investment in the Securities may be subject to risks associated with non-U.S. markets.

The underlying equity or the basket equities to which your Securities may be linked may be an ADS representing foreign stock or an ETF that invests in securities, futures contracts or commodities that are traded on non-U.S. markets. In addition, following certain corporate events affecting the underlying equity or a basket equity, or following delisting or termination of an underlying equity or a basket equity that is an ADS, such underlying equity or basket equity may be substituted or replaced by a security issued by a non-U.S. company and quoted and traded in a foreign currency. An investment in securities linked directly or indirectly to the value of securities issued by non-U.S. companies involves particular risks. Generally, non-U.S. securities markets may be more volatile than U.S. securities markets, and market developments may affect non-U.S. markets differently from U.S. securities markets. Direct or indirect government intervention to stabilize these non-U.S. markets, as well as cross shareholdings in non-U.S. companies, may affect trading prices and volumes in those markets. There is generally less publicly available information about non-U.S. companies than about those U.S. companies that are subject to the reporting requirements of the SEC, and non-U.S. companies are subject to accounting, auditing and financial reporting standards and requirements that differ from those applicable to U.S. reporting companies. Similarly, regulations of the Commodity Futures Trading Commission generally do not apply to trading on non-U.S. exchanges, and trading on non-U.S. exchanges may involve different and greater risks than trading on U.S. exchanges. Securities and futures prices in non-U.S. countries are subject to political, economic, financial and social factors that may be unique to the particular country. These factors, which could negatively affect the non-U.S. securities and futures markets, include the possibility of recent or future changes in the non-U.S. governments economic and fiscal policies, the possible imposition of, or changes in, currency exchange laws or other non-U.S. laws or restrictions applicable to non-U.S. companies or investments in non-U.S. securities or futures contracts and the possibility of fluctuations in the rate of exchange between currencies. Moreover, certain aspects of a particular non-U.S. economy may differ favorably or unfavorably from the U.S. economy in important respects, such as growth of gross national product, rate of inflation, capital reinvestment, resources and self-sufficiency. Finally, it will likely be more costly and difficult to enforce the laws or regulations of a non-U.S. country or exchange.

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Fluctuations relating to exchange rates may affect the value of your investment.

Fluctuations in exchange rates may affect the value of your investment where: (1) the underlying equity or a basket equity is an ADS, which is quoted and traded in U.S. dollars, but represents a foreign stock that is quoted and traded in a foreign currency and that may trade differently from the ADS, or (2) the underlying equity or a basket equity is substituted or replaced by a security that is quoted and traded in a foreign currency. Such substitution or replacement of the underlying equity or basket equity by a security issued by a non-U.S. company may occur following certain corporate events affecting such underlying equity or basket equity (as described under General Terms of the Securities Antidilution Adjustments Reorganization Events on page PS- 37 ) or following delisting or termination of an underlying equity or basket equity that is an ADS (as described under General Terms of the Securities Delisting of ADSs or Termination of ADS Facility on page PS- 40 ).

If the underlying equity or a basket equity is an ETF that invests in securities, futures contracts or commodities that are traded on non-U.S. markets, the trading price of the securities, futures contracts or commodities in which the ETF invests generally will reflect the U.S. dollar value of those assets. Therefore, holders of Securities based upon an ETF that invests in non-U.S. markets will be exposed to currency exchange rate risk with respect to the currency in which such securities, futures contracts or commodities trade. An investors net exposure will depend on the extent to which the relevant non-U.S. currency strengthens or weakens against the U.S. dollar and the relative weight of the relevant non-U.S. asset in the ETFs portfolio. If, taking into account such weighting, the dollar strengthens against such non-U.S. currency, the market price of the ETF may be adversely affected and the value of the Securities may decrease.

In recent years, the exchange rates between the U.S. dollar and some other currencies have been highly volatile, and this volatility may continue in the future. Risks relating to exchange rate fluctuations generally depend on economic and political events over which we have no control. Fluctuations in any particular exchange rate that have occurred in the past are not necessarily indicative, however, of fluctuations that may occur during the term of the Securities. Changes in the exchange rate between the U.S. dollar and a foreign currency may affect the U.S. dollar equivalent of the price of any relevant security, futures contract or commodity on non-U.S. markets and, as a result, may affect the value of the Securities. As a consequence, such fluctuations could adversely affect an investment in the Securities if: (1) the underlying equity or a basket equity is an ADS, which is quoted and traded in U.S. dollars, but represents a foreign stock that is quoted and traded in a foreign currency, (2) the underlying equity or a basket equity is substituted or replaced by a security issued by a non-U.S. company that is quoted and traded in a foreign currency or (3) the underlying equity or a basket equity is an ETF that invests in securities, futures contracts or commodities that are quoted and traded in a foreign currency.

In addition, foreign exchange rates can either be floating or fixed by sovereign governments. Exchange rates of the currencies used by most economically developed nations are permitted to fluctuate in value relative to the U.S. dollar and to each other. However, from time to time governments and, in the case of countries using the euro, the European Central Bank, may use a variety of techniques, such as intervention by a central bank in foreign exchange, money markets, sovereign debt or other financial markets, the imposition of regulatory controls or taxes or changes in interest rates to influence the exchange rates of their currencies. Governments may also issue a new currency to replace an existing currency or alter the exchange rate or relative exchange characteristics by a devaluation or revaluation of a currency. These governmental actions could change or interfere with currency valuations and currency fluctuations that would otherwise occur in response to economic forces, as well as in response to the movement of currencies across borders. As a consequence, these government actions could adversely affect an investment in the Securities if: (1) the underlying equity or a basket equity is an ADS, which is quoted and traded in U.S. dollars, but represents a foreign stock that is quoted and traded in a foreign currency, (2) the underlying equity or a basket equity is substituted or replaced by a security issued by a

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non-U.S. company that is quoted and traded in a foreign currency or (3) the underlying equity or a basket equity is an ETF that invests in securities, futures contracts or commodities that are quoted and traded in a foreign currency.

We will not make any adjustment or change in the terms of the Securities in the event that applicable exchange rates should become fixed, or in the event of any devaluation or revaluation or imposition of exchange or other regulatory controls or taxes, or in the event of other developments affecting the U.S. dollar or any relevant foreign currency. You will bear any such risks, which are substantial and material.

The value of the shares of an ETF may not completely track the value of the shares of the securities in which the ETF invests or the level of its respective underlying index.

If the underlying equity or a basket equity is an ETF, you should be aware that, although the trading characteristics and valuations of the ETF will usually mirror the characteristics and valuations of the securities, futures contracts or commodities in which that ETF invests, the value of the ETF may not completely track the value of the securities, futures contracts or commodities in which that ETF invests. The value of the ETF will reflect transaction costs and fees that the securities, futures contracts or commodities in which the ETF invests do not have.

In addition, the ETF may seek to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of a specific index (the underlying index). The correlation between the performance of an ETF and the performance of its underlying index may not be perfect. Although the performance of an ETF seeks to replicate the performance of its underlying index, the ETF may not invest in all the securities, futures contracts or commodities comprising such underlying index but rather may invest in a representative sample of securities, futures contracts or commodities comprising such underlying index. Also, an ETF may not fully replicate the performance of its underlying index due to the temporary unavailability of certain securities, futures contracts or commodities comprising such underlying index. Furthermore, because an ETF is traded on a national securities exchange and is subject to the market supply and demand by investors, the market value of an ETF may differ from the net asset value per share of the ETF. Finally, the performance of an ETF will reflect transaction costs and fees that are not included in the calculation of its underlying index. As a result of the foregoing, the performance of an ETF may not exactly replicate the performance of its underlying index.

In addition, although shares of an ETF may be currently listed for trading on an exchange, there is no assurance that an active trading market will continue for the shares of an ETF or that there will be liquidity in the trading market.

If the underlying equity or a basket equity is an ADS, the value of the ADSs may not completely track the price of the foreign stock represented by such ADSs.

If the underlying equity or a basket equity is an ADS, you should be aware that, although the trading characteristics and valuations of the ADSs will usually mirror the characteristics and valuations of the foreign stock represented by the ADSs, the value of ADSs upon which an offering of the Securities is based may not completely track the value of the foreign stock represented by such ADSs. Active trading volume and efficient pricing for such foreign stock on the markets on which that foreign stock principally trades will usually, but not necessarily, indicate similar characteristics in respect of the ADSs. In addition, the terms and conditions of depositary facilities may result in less liquidity or lower market value of the ADSs than for the foreign stock. Since holders of the ADSs may surrender the ADSs to take delivery of and trade the foreign stock (a characteristic that allows investors in ADSs to take advantage of price differentials between different markets), an illiquid market for the foreign stock generally will result in an illiquid market for the ADSs representing such foreign stock.

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If the underlying equity or a basket equity is an ADS, the trading price of the ADSs and the trading price of the Securities linked to the ADSs will be affected by conditions in the markets where those ADSs principally trade.

Although the market price of ADSs upon which an offering of Securities is based is not directly tied to the trading price of the foreign stock in the non-U.S. markets where such foreign stock principally trades, the trading price of ADSs is generally expected to track the U.S. dollar value of the currency of the country where the foreign stock principally trades and the trading price of such foreign stock on the markets where that foreign stock principally trades. This means that the trading value of any ADSs upon which an offering of the Securities is based is expected to be affected by the exchange rates between the U.S. dollar and the currency of the country where the foreign stock principally trades and by factors affecting the markets where such foreign stock principally trades.

There are important differences between the rights of holders of ADSs and the rights of holders of the foreign stock.

If the underlying equity or a basket equity is an ADS, you should be aware that your Securities are linked to the ADS and not the foreign stock represented by such ADS, and there exist important differences between the rights of holders of an ADS and the foreign stock such ADS represents. Each ADS is a security evidenced by American Depositary Receipts that represents a specified number of shares of the foreign stock. Generally, the ADSs are issued under a deposit agreement, which sets forth the rights and responsibilities of the depositary, the foreign stock issuer and holders of the ADSs, which may be different from the rights of holders of common stock of the foreign stock issuer. For example, the foreign stock issuer may make distributions in respect of the foreign stock that are not passed on to the holders of its ADSs. Any such differences between the rights of holders of the ADSs and holders of the foreign stock may be significant and may materially and adversely affect the market value of your Securities.

HEDGING ACTIVITIES AND CONFLICTS OF INTEREST

Trading and other transactions by UBS or its affiliates in the underlying equity or any basket equity or underlying assets of an ETF, or futures, options, exchange traded funds or other derivative products based on the underlying equity or any basket equity may adversely affect any amount payable at maturity and the market value of the Securities.

As described below under Use of Proceeds and Hedging on page PS- 45 , UBS or its affiliates may hedge their obligations under the Securities by purchasing the underlying equity or the basket equities or underlying assets of an ETF, futures, options or exchange traded funds on the underlying equity or the basket equities or underlying assets of an ETF or other exchange traded or over the counter derivative instruments with returns linked or related to changes in the performance of the underlying equity or the basket equities, and they may adjust these hedges by, among other things, purchasing or selling the underlying equity or the basket equities or underlying assets of an ETF, futures, options, or exchange traded funds or other exchange traded or over the counter derivative instruments at any time. Although they are not expected to, any of these hedging activities may adversely affect the market price(s) of the underlying equity or the basket equities and, therefore, the amount payable at maturity and the market value of the Securities. It is possible that UBS or its affiliates could receive substantial returns from these hedging activities while the market value of the Securities declines. No holder of the Securities will have any rights or interest in our hedging activity or any positions we may take in connection with our hedging activity.

UBS or its affiliates may also engage in trading in the underlying equity or the basket equities or the underlying assets of an ETF and other investments relating to the underlying equity or the basket equities or the underlying assets of an ETF on a regular basis as part of our general broker-dealer and other businesses, for proprietary accounts, for other accounts under management or to facilitate transactions

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for customers, including block transactions. Any of these activities could adversely affect the market price of the underlying equity or the basket equities and, therefore, the amount payable at maturity and the market value of the Securities. UBS or its affiliates may also issue or underwrite other securities or financial or derivative instruments with returns linked or related to changes in the performance of the underlying equity or the basket equities. By introducing competing products into the marketplace in this manner, UBS or its affiliates could adversely affect the market value of, and your return on, the Securities.

UBS Securities LLC and other affiliates of UBS, as well as other third parties, may also make a secondary market in the Securities, although they are not obligated to do so. As market makers, trading of the Securities may cause UBS Securities LLC or other affiliates of UBS, as well as other third parties, to be long or short the Securities in their inventory. The supply and demand for the Securities, including inventory positions of market makers, may affect the secondary market price for the Securities.

The business activities of UBS or its affiliates may create conflicts of interest.

As noted above, UBS and its affiliates expect to engage in trading activities related to the underlying equity or the basket equities that are not for the account of holders of the Securities or on their behalf. These trading activities may present a conflict between the holders interest in the Securities and the interests UBS and its affiliates will have in their proprietary accounts in facilitating transactions, including block trades and options and other derivatives transactions, for their customers and in accounts under their management. These trading activities, if they influence the price of the underlying equity or any basket equity, could be adverse to the interests of the holders of the Securities.

UBS and its affiliates may, at present or in the future, engage in business with an underlying equity issuer, including making loans to or acting as a counterparty (including with respect to derivatives) or providing advisory services to that company. These services could include investment banking and merger and acquisition advisory services. These activities may present a conflict between the obligations of UBS or another affiliate of UBS and the interests of holders of the Securities as beneficial owners of the Securities. Any of these activities by UBS, UBS Securities LLC or other affiliates may affect the closing price(s) of the underlying equity or basket equities and, therefore, the amount payable at maturity and the market value of the Securities.

We and our affiliates may publish research, express opinions or provide recommendations that are inconsistent with investing in or holding the Securities. Any such research, opinions or recommendations could affect the price of the underlying equity or the market value of, and your return on, the Securities.

UBS and its affiliates publish research from time to time on financial markets, commodities markets and other matters that may influence the value of the Securities, or express opinions or provide recommendations that are inconsistent with purchasing or holding the Securities. UBS and its affiliates may have published research or other opinions that call into question the investment view implicit in your Securities. Any research, opinions or recommendations expressed by UBS or its affiliates may not be consistent with each other and may be modified from time to time without notice. Investors should make their own independent investigation of the merits of investing in the Securities and the underlying equity or the underlying basket to which the Securities are linked.

There are potential conflicts of interest between you and the calculation agent.

Our affiliate, UBS Securities LLC, will serve as the calculation agent. UBS Securities LLC will, among other things, decide the amount of the cash payment, if any, at maturity of the Securities. We may change the calculation agent after the original issue date of any Securities without notice. For a fuller description of the calculation agents role, see General Terms of the Securities Role of Calculation Agent. The calculation agent will exercise its judgment when performing its functions. For example, the calculation agent may have to determine whether a market disruption event affecting the underlying equity or a

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basket equity has occurred or is continuing on the final valuation date. This determination may, in turn, depend on the calculation agents judgment as to whether the event has materially interfered with our ability or the ability of any of our affiliates to maintain or unwind hedge positions. See Use of Proceeds and Hedging. Since this determination by the calculation agent may affect the payment at maturity on the Securities, the calculation agent may have a conflict of interest if it needs to make any such decision.

One of our affiliates may serve as the depositary for the ADSs that may constitute the underlying equity or a basket equity.

One of our affiliates may serve as the depositary for some foreign companies that issue ADSs. If the underlying equity or any basket equity is an ADS and one of our affiliates serves as depositary for such ADSs, the interests of our affiliate, in its capacity as depositary for the ADSs, may be adverse to your interests as a holder of Securities.

Affiliates of UBS may act as agent or dealer in connection with the sale of the Securities.

UBS and its affiliates act in various capacities with respect to the Securities. We and our affiliates may act as a principal, agent or dealer in connection with the sale of the Securities. Such affiliates, including the sales representatives, will derive compensation from the distribution of the Securities and such compensation may serve as an incentive to sell these Securities instead of other investments. We may pay dealer compensation to any of our affiliates acting as agents or dealers in connection with the distribution of the Securities.

RISKS RELATED TO TAXATION ISSUES

Significant aspects of the tax treatment of the Securities are uncertain.

Significant aspects of the tax treatment of the Securities are uncertain. We do not plan to request a ruling from the Internal Revenue Service regarding the tax treatment of the Securities, and the Internal Revenue Service or a court may not agree with the tax treatment described in this product supplement or the applicable pricing supplement. Please read carefully the section entitled Supplemental U.S. Tax Considerations on page PS- 46 of this product supplement and the section U.S. Tax Considerations in the accompanying prospectus. You should consult your tax advisor about your own tax situation.

Further, although the matter is not clear, there exists a risk that an investment in Securities that are linked to shares of an ETF, PFIC or other pass thru entity or a basket that contains ETFs, PFICs or other pass thru entities will be treated as a constructive ownership transaction which could result in part or all of any long-term capital gain realized by you on sale or maturity of a Security being recharacterized as ordinary income and subject to an interest charge.

In addition, the Internal Revenue Service has released a notice that may affect the taxation of holders of the Securities. According to the notice, the Internal Revenue Service and the Treasury Department are actively considering whether the holder of an instrument such as the Securities should be required to accrue ordinary income on a current basis, and they are seeking taxpayer comments on the subject. It is not possible to determine what guidance they will ultimately issue, if any. It is possible, however, that under such guidance, holders of the Securities will ultimately be required to accrue income currently and this could be applied on a retroactive basis. The Internal Revenue Service and the Treasury Department are also considering other relevant issues, including whether additional gain or loss from such instruments should be treated as ordinary or capital, whether foreign holders of such instruments should be subject to withholding tax on any deemed income accruals, and whether the special constructive ownership rules should be applied to such instruments. Holders are urged to consult their tax advisors concerning the significance, and the potential impact, of the above considerations. Except to the extent otherwise required by law, UBS intends to treat your Securities for United States federal income tax

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purposes in accordance with the treatment described under Supplemental U.S. Tax Considerations on page PS- 46 unless and until such time as the Treasury Department and Internal Revenue Service determine that some other treatment is more appropriate.

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General Terms of the Securities

The following is a summary of the general terms of the Securities. The information in this section is qualified in its entirety by the more detailed explanation set forth elsewhere in the applicable pricing supplement and in the accompanying prospectus. In this section, references to holders mean those who own the Securities registered in their own names, on the books that we or the trustee maintain for this purpose, and not those who own beneficial interests in the Securities registered in street name or in the Securities issued in book-entry form through the Depository Trust Company (DTC) or another depositary. Owners of beneficial interests in the Securities should read the section entitled Legal Ownership and Book-Entry Issuance in the accompanying prospectus.

In addition to the terms described elsewhere in this product supplement, the following general terms will apply to the Securities:

No Coupon

Unlike ordinary debt securities, UBS will not pay periodic interest on the Securities and will not necessarily repay any of the principal amount of the Securities at maturity.

Denomination

Each Security will have a principal amount of $10.00, unless otherwise specified in the applicable pricing supplement. In the case of offerings of $10.00 Securities, your minimum investment is 100 Securities at a principal amount at $10.00 per Security (for a total minimum purchase price of $1,000), unless otherwise specified in the applicable pricing supplement. Purchases in excess of the minimum amount may be made in integrals of one Security at a principal amount of $10.00 per Security. Purchases and sales made in the secondary market are not subject to the minimum investment of 100 Securities.

Payment at Maturity

Unless otherwise specified in the applicable pricing supplement, at maturity UBS will pay a cash payment per Security that you hold, calculated as follows:

¨ If the underlying return is positive, UBS will pay you for each Security that you hold a cash payment equal to

$10 + [$10 × (Underlying Return × Multiplier)]; provided, however, that in no event will UBS pay an amount greater than $10 + ($10 × Maximum Gain).

$10 + ($10 × Underlying Return).

Investing in the Securities involves significant risks. The Securities differ from ordinary debt securities in that UBS is not necessarily obligated to repay the full amount of your initial investment. You may lose some or all of your investment. Specifically, if the final price is below the trigger price, you will lose 1% (or a fraction thereof) of your principal amount for each 1% (or a fraction thereof) that the underlying return is less than zero.

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The multiplier and the maximum gain applicable to the Securities will be specified in the applicable pricing supplement.

Underlying Return = Final Price Initial Price

Initial Price

In the case of Securities linked to an underlying basket, the underlying return may be referred to as the basket return in the applicable pricing supplement.

The trade date and the final valuation date will be specified in the applicable pricing supplement.

Maturity Date

The maturity date for your Securities will be the date specified in the applicable pricing supplement, unless that day is not a business day, in which case the maturity date will be the next following business day. If the calculation agent postpones the final valuation date with respect to the underlying equity or any basket equity (as the case may be), the maturity date will be automatically postponed to maintain the

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same number of business days between the latest postponed final valuation date and the maturity date as existed prior to the postponement(s) of the final valuation date. The calculation agent may postpone the final valuation date for the underlying equity or a basket equity (as the case may be) if a market disruption event occurs or is continuing with respect to such underlying equity or basket equity on a day that would otherwise be the final valuation date. We describe market disruption events under Market Disruption Event below.

A postponement of the maturity date for one offering of the Securities will not affect the maturity date for any other offering of the Securities.

Final Valuation Date

The final valuation date for your Securities will be the date specified in the applicable pricing supplement, unless the calculation agent determines that a market disruption event has occurred or is continuing on any such day with respect to the underlying equity or a basket equity (as the case may be). In that event, the final valuation date for the disrupted underlying equity or basket equity (as the case may be) will be the first following trading day on which the closing price of such underlying equity or basket equity is determinable and on which the calculation agent determines that a market disruption event has not occurred and is not continuing with respect to such underlying equity or basket equity. In no event, however, will the final valuation date for the Securities be postponed by more than eight trading days with respect to any underlying equity or basket equity.

If a particular offering of the Securities is linked to an underlying basket, a market disruption event for a particular basket equity included in such underlying basket will not necessarily be a market disruption event for another basket equity included in such underlying basket. If, on the final valuation date, no market disruption event with respect to a particular basket equity occurs or is continuing, then such final valuation date will not be postponed with respect to such basket equity, irrespective of the occurrence of a market disruption event on such final valuation date with respect to one or more of the other basket equities.

A postponement of the final valuation date for one offering of the Securities will not affect the final valuation date for any other offering of the Securities.

If final valuation date specified in the applicable pricing supplement occurs on a day that is not a trading day, the final valuation date will be the next following trading day.

Closing Price

The closing price for an underlying equity, basket equity or any other security for which a closing price must be determined on any trading day means:

¨ if the underlying equity or basket equity (or such other security) is listed or admitted to trading on a national securities exchange, the last reported sale price, regular way (or, in the case of NASDAQ, the official closing price), for such underlying equity or basket equity (or such other security) during the principal trading session on such day on the principal United States securities exchange registered under the Securities Exchange Act of 1934, as amended (the Exchange Act), on which the underlying equity or basket equity (or such other security) is listed or admitted to trading; or

¨ if, following certain corporate events affecting the underlying equity or basket equity or following delisting or termination of the underlying equity or basket equity, the underlying equity is substituted or replaced by a security issued by a non-U.S. company and quoted and traded in a foreign currency, the official closing price for such non-U.S. security on the primary foreign exchange on which such non-U.S. security is listed (such closing price to be converted to U.S. dollars according to the conversion mechanism described below under General Terms of the Securities Antidilution Events Reorganization Events on page PS- 37 ); or

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¨ if the underlying equity or basket equity (or such other security) is not listed or admitted to trading on any national securities exchange but is included in the OTC Bulletin Board Service operated by FINRA, the last reported sale price during the principal trading session on the OTC Bulletin Board Service on such day; or

¨ otherwise, if none of the above circumstances is applicable, the mean, as determined by the calculation agent, of the bid prices for the underlying equity or basket equity (or such other security) obtained from as many dealers in such security, but not exceeding three, as will make such bid prices available to the calculation agent.

Market Disruption Event

The calculation agent will determine the final price based upon the closing price(s) of the underlying equity or the basket equities (as the case may be) on the final valuation date specified in the applicable pricing supplement. As described above, the final valuation date may be postponed with respect to the underlying equity or a basket equity (as the case may be), and thus the determination of the final price with respect to such final valuation date may be postponed, if the calculation agent determines that, on the final valuation date, a market disruption event has occurred or is continuing with respect to such underlying equity or basket equity. If such a postponement occurs, the calculation agent will determine the final price with reference to the closing price for the disrupted underlying equity or basket equity on the first trading day on which no market disruption event occurs or is continuing with respect to such underlying equity or basket equity. Notwithstanding the occurrence of one or more of the events below, which may, as determined by the calculation agent, constitute a market disruption event, the calculation agent may waive its right to postpone the final valuation date, if it determines that one or more of the events described below has not and is not likely to materially impair its ability to determine the closing price(s) of the underlying equity or one or more basket equities. In no event, however, will the final valuation date be postponed by more than eight trading days.

If the determination of final price is postponed to the last possible day, but a market disruption event occurs or is continuing on that day, that day will nevertheless be the date on which the final price will be determined by the calculation agent. In such an event, the calculation agent will make an estimate of the final price that would have prevailed in the absence of the market disruption event.

If a particular offering of the Securities is linked to an underlying basket, a market disruption event for a particular basket equity included in such underlying basket will not necessarily be a market disruption event for another basket equity included in such underlying basket. If, on the originally scheduled final valuation date, no market disruption event with respect to a particular basket equity occurs or is continuing, then the determination of the closing price for such basket equity will be made on the originally scheduled final valuation date, irrespective of the occurrence of a market disruption event with respect to one or more of the other basket equities.

Any of the following will be a market disruption event with respect to a particular underlying equity or basket equity related to a particular offering of the Securities, in each case as determined by the calculation agent:

¨ a suspension, absence or material limitation of trading in the underlying equity or basket equity in the primary market for such equity for more than two hours of trading or during the one hour before the close of trading in that market;

¨ a suspension, absence or material limitation of trading in option or futures contracts, if available, relating to the underlying equity or basket equity or, if the underlying equity or basket equity is an ETF, to the underlying index of the ETF or the securities, futures contracts, commodities or other

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assets constituting the assets of the ETF (underlying assets), in the primary market for those contracts for more than two hours of trading or during the one hour before the close of trading in that market;

¨ if the underlying equity or basket equity is an ETF, the occurrence or existence of a suspension, absence or material limitation of trading in the assets which then comprise 20% or more of the value of the underlying assets of the ETF on the primary exchanges for such assets for more than two hours of trading, or during the one hour before the close of trading of such exchanges; or

¨ in any other event, if the calculation agent determines that the event materially interferes with our ability or the ability of any of our affiliates to (1) maintain or unwind all or a material portion of a hedge with respect to the Securities that we or our affiliates have effected or may effect as described below under Use of Proceeds and Hedging or (2) effect trading in the underlying equity or any basket equity generally.

For the avoidance of doubt, for any offering of the Securities, a suspension, absence or material limitation of trading in option or futures contracts, if available, relating to the underlying equity or a basket equity or, if the underlying equity or basket equity is an ETF, to the underlying index or the underlying assets of the ETF, in the primary market for those contracts by reason of any of:

¨ a price change exceeding limits set by that market,

¨ an imbalance of orders relating to those contracts, or

¨ a disparity in bid and ask quotes relating to those contracts,

will constitute a market disruption event relating to such underlying equity or basket equity.

For this purpose, for any offering of the Securities, an absence of trading in option or futures contracts, if available, relating to the underlying equity or a basket equity or, if the underlying equity or basket equity is an ETF, to the underlying index or the underlying assets of the ETF, in the primary market for those contracts will not include any time when that market is itself closed for trading under ordinary circumstances.

The following events will not be market disruption events:

¨ a limitation on the hours or numbers of days of trading in the underlying equity or a basket equity (as the case may be) in the primary market for such equity, but only if the limitation results from an announced change in the regular business hours of the relevant market; or

¨ a decision to permanently discontinue trading in the option or futures contracts relating to the underlying equity or a basket equity (as the case may be) or, if the underlying equity or basket equity is an ETF, to the underlying index or underlying assets of the ETF.

A market disruption event for a particular offering of the Securities will not necessarily be a market disruption event for any other offering of the Securities.

Antidilution Adjustments

For any offering of the Securities, the initial price and the trigger price are subject to adjustments by the calculation agent as a result of the dilution and reorganization events described in this section. The adjustments described below do not cover all events that could affect the value of the Securities. We describe the risks relating to dilution above under Risk Factors You have limited antidilution protection on page PS- 17 .

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How Adjustments Will Be Made

If one of the events described below occurs with respect to the underlying equity or a basket equity of an offering of the Securities and the calculation agent determines that the event has a diluting or concentrative effect on the theoretical value of such underlying equity or basket equity (as the case may be), the calculation agent will calculate such corresponding adjustment or series of adjustments to either (i) the initial price and the trigger price of the affected underlying equity or (ii) the initial equity price of the affected basket equity (as the case may be) as the calculation agent determines appropriate to account for that diluting or concentrative effect, where initial equity price means, with respect to a basket equity, the closing price of such basket equity determined on the trade date. For example, if an offering of the Securities is linked to one underlying equity and an adjustment is required because of a two-for-one stock split, then the initial price and the trigger price will each be halved. On the other hand, if an offering of the Securities is linked to an underlying basket and an adjustment is required because of a two-for-one stock split with respect to one basket equity included in such underlying basket, then (i) the initial equity price of such basket equity will be halved, (ii) the calculation agent will determine the final price of the underlying basket with reference to the initial equity price of the affected basket equity as adjusted, and (iii) no adjustment will otherwise be made with respect to the other unaffected basket equities or to the initial price and trigger price of the underlying basket. The calculation agent will also determine the effective date(s) of any adjustment or series of adjustments it chooses to make and the replacement of the underlying equity or a basket equity, if applicable, in the event of a consolidation or merger of the issuer of the applicable underlying stock with another entity. Upon making any such adjustment, the calculation agent will give notice as soon as practicable to the trustee, stating the corresponding adjustments to the initial price and the trigger price or an initial equity price (as the case may be).

If more than one event requiring an adjustment occurs, the calculation agent will make an adjustment for each event in the order in which the events occur and on a cumulative basis. Thus, the calculation agent will adjust (i) the initial price and the trigger price or (ii) the relevant initial equity price (as applicable) for the first event, then adjust the (i) adjusted initial price and the adjusted trigger price or (ii) the relevant adjusted initial equity price (as applicable) for the second event, and so on for any subsequent events.

If an event requiring antidilution adjustments occurs, notwithstanding the description of the specific adjustments to be made, the calculation agent may make adjustments or a series of adjustments that differ from, or that are in addition to, those described in this product supplement with a view to offsetting, to the extent practical, any change in your economic position as a holder of the Securities that results solely from that event. The calculation agent may modify any terms as necessary to ensure an equitable result. The terms that may be so modified by the calculation agent include, but are not limited to, the initial price and the trigger price of the underlying equity or the initial equity price of any basket equity in an underlying basket. The calculation agent may make adjustments that differ from, or that are in addition to, those described in this product supplement if the calculation agent determines that any adjustments so described do not achieve an equitable result or otherwise. In determining whether or not any adjustment so described achieves an equitable result, the calculation agent may consider any adjustment made by the Options Clearing Corporation or any other equity derivatives clearing organization on options contracts on the affected underlying equity or basket equity.

No such adjustments will be required unless such adjustments would result in a change of at least 0.1% in the initial price or initial equity price (as applicable). The initial price and trigger price or initial equity price resulting from any adjustment will be rounded up or down, as appropriate, to the nearest cent, with one-half cent being rounded upward.

If your Securities are linked to an ADS, the term dividend used in this section will mean, unless we specify otherwise in the pricing supplement for your Securities, the dividend paid by the foreign stock

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issuer, net of any applicable foreign withholding or similar taxes that would be due on dividends paid to a U.S. person that claims and is entitled to a reduction in such taxes under an applicable income tax treaty, if available.

For purposes of the antidilution adjustments, if an ADS is serving as the underlying equity or a basket equity, the calculation agent will consider the effect of the relevant event on the holders of the ADS. For instance, if a holder of the ADS receives an extraordinary dividend, the provisions below would apply to the ADS. On the other hand, if a spin-off occurs, and the ADS represents both the spun-off security as well as the existing foreign stock, the calculation agent may determine not to effect antidilution adjustments. More particularly, if an ADS is serving as the underlying equity or a basket equity, no adjustment will be made (1) if holders of ADSs are not eligible to participate in any of the events requiring antidilution adjustments described below or (2) to the extent that the calculation agent determines that the foreign stock issuer or the depositary for the ADSs has adjusted the number of shares of foreign stock represented by each ADS so that the ADS price would not be affected by the corporate event in question.

If the foreign stock issuer or the depository for the ADSs, in the absence of any of the events described below, elects to adjust the number of shares of foreign stock represented by each ADS, then the calculation agent may make the necessary antidilution adjustments to reflect such change. The depository for the ADSs may also have the ability to make adjustments in respect of the ADS for share distributions, rights distributions, cash distributions and distributions other than shares, rights and cash. Upon any such adjustment by the depository, the calculation agent may adjust such terms and conditions of the Securities as the calculation agent determines appropriate to account for that event.

The calculation agent will make all determinations with respect to antidilution adjustments affecting a particular offering of the Securities, including any determination as to whether an event requiring adjustments has occurred (including whether an event has a diluting or concentrative effect on the theoretical value of the applicable underlying equity or an applicable basket equity), as to the nature of the adjustments required and how they will be made or as to the value of any property distributed in a reorganization event with respect to those Securities. Upon your written request, the calculation agent will provide you with information about any adjustments it makes as the calculation agent determines is appropriate.

The following events are those that may require antidilution adjustments:

¨ a subdivision, consolidation or reclassification of the underlying equity or a basket equity or a free distribution or dividend of shares of the underlying equity or a basket equity to existing holders of the underlying equity or basket equity by way of bonus, capitalization or similar issue;

¨ a distribution or dividend to existing holders of the underlying equity or a basket equity of:

¨ additional shares of the underlying equity or basket equity as described under Stock Dividends below,

¨ other share capital or securities granting the right to payment of dividends and/or proceeds of liquidation of the respective underlying equity issuer equally or proportionately with such payments to holders of the underlying equity or basket equity (as may be the case), or

¨ any other type of securities, rights or warrants in any case for payment (in cash or otherwise) at less than the prevailing market price as determined by the calculation agent;

¨ the declaration by the respective underlying equity issuer of an extraordinary or special dividend or other distribution, whether in cash or additional shares of the underlying equity or basket equity (as the case may be) or other assets;

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¨ a repurchase by the respective underlying equity issuer of its equity, whether out of profits or capital and whether the consideration for such repurchase is cash, securities or otherwise;

¨ if the underlying equity or a basket equity is common stock in a specific company (underlying stock), a consolidation of the respective underlying equity issuer with another company or merger of the respective underlying equity issuer with another company; and

¨ any other similar event that may have a diluting or concentrative effect on the theoretical value of the underlying equity or a basket equity.

The adjustments described below do not cover all events that could affect the value of the Securities. We describe the risks relating to dilution under Risk Factors You have limited antidilution protection on page PS- 17 .

Stock Splits and Reverse Stock Splits

A stock split is an increase in the number of a corporations outstanding shares of stock without any change in its stockholders equity. Each outstanding share is worth less as a result of a stock split. A reverse stock split is a decrease in the number of a corporations outstanding shares of stock without any change in its stockholders equity. Each outstanding share is worth more as a result of a reverse stock split.

If the underlying equity is subject to a stock split or a reverse stock split, then the initial price and the trigger price will each be adjusted by dividing the prior initial price and the prior trigger price, respectively, by, the number of shares that a holder of one share of the underlying equity before the effective date of that stock split or reverse stock split would have owned or been entitled to receive immediately following the applicable effective date.

If an offering of the Securities is linked to an underlying basket and a basket equity is subject to a stock split or a reverse stock split, then the relevant initial equity price will be adjusted by dividing the prior initial equity price by the number of shares that a holder of one share of the basket equity before the effective date of that stock split or reverse stock split would have owned or been entitled to receive immediately following the applicable effective date.

Stock Dividends or Distributions

In a stock dividend, a corporation issues additional shares of its stock to all holders of its outstanding stock in proportion to the shares they own. Each outstanding share is worth less as a result of a stock dividend.

If the underlying equity is subject to a stock dividend payable in shares of the underlying equity, then the initial price and the trigger price will each be adjusted by dividing the prior initial price and the prior trigger price, respectively, by, the sum of one and the number of additional shares issued in the stock dividend or distribution with respect to one share of the underlying equity.

If an offering of the Securities is linked to an underlying basket and a basket equity is subject to a stock dividend payable in shares of the basket equity, then the initial equity price will be adjusted by dividing the prior initial equity price by the sum of one and the number of additional shares issued in the stock dividend or distribution with respect to one share of the basket equity.

It is not expected that antidilution adjustments will be made to the initial price and the trigger price or any initial equity price (as the case may be) in the case of stock dividends payable in shares of the underlying equity or a basket equity that are in lieu of ordinary cash dividends payable with respect to shares of the underlying equity or basket equity.

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Other Dividends or Distributions

None of the initial price and the trigger price or any initial equity price (as the case may be) for a particular offering of the Securities will be adjusted to reflect dividends or other distributions paid with respect to the underlying equity or a basket equity, other than:

¨ stock dividends described under Stock Dividends above;

¨ issuances of transferable rights and warrants with respect to the underlying equity or basket equity as described under Transferable Rights and Warrants below;

¨ if the underlying equity or basket equity is common stock in a specific company, distributions that are spin-off events described under Reorganization Events beginning on page PS- 37 ; and

¨ extraordinary cash dividends described below.

For any offering of the Securities, a dividend or other distribution with respect to the underlying equity or a basket equity will be deemed to be an extraordinary dividend if its per share value exceeds that of the immediately preceding non-extraordinary dividend, if any, for the underlying equity or basket equity by an amount equal to at least 10% of the closing price of the underlying equity or basket equity on the trading day before the ex-dividend date. The ex-dividend date for any dividend or other distribution is the first day on which the underlying equity or basket equity trades without the right to receive that dividend or distribution.

If an extraordinary dividend, as described above, occurs with respect to the underlying equity and is payable in cash, the initial price and the trigger price will each be adjusted by dividing the prior initial price and prior trigger price, respectively, by, the ratio of the closing price of the underlying equity on the trading day before the ex-dividend date to the amount by which that closing price exceeds the extraordinary cash dividend amount. If an offering of the Securities is linked to an underlying basket and an extraordinary dividend, as described above, occurs with respect to a basket equity and is payable in cash, then the relevant initial equity price will be adjusted by dividing the prior initial equity price by the ratio of the closing price of the basket equity on the trading day before the ex-dividend date to the amount by which that closing price exceeds the extraordinary cash dividend amount.

The extraordinary cash dividend amount with respect to an extraordinary dividend for the underlying equity or basket equity equals:

¨ for an extraordinary cash dividend that is paid in lieu of a regular quarterly dividend, the amount of the extraordinary cash dividend per share of underlying equity or basket equity minus the amount per share of underlying equity or basket equity of the immediately preceding dividend, if any, that was not an extraordinary dividend for the underlying equity or basket equity; or

¨ for an extraordinary cash dividend that is not paid in lieu of a regular quarterly dividend, the amount per share of the extraordinary cash dividend.

To the extent an extraordinary dividend is not paid in cash, the value of the non-cash component will be determined by the calculation agent. A distribution payable to the holders of the underlying equity or a basket equity that is both an extraordinary dividend and payable in underlying equity or basket equity, or an issuance of rights or warrants with respect to the underlying equity or a basket equity that is also an extraordinary dividend, will result in adjustments to the initial price and the trigger price or the relevant initial equity price (as the case may be), as described under Stock Dividends above or Transferable Rights and Warrants below, as the case may be, and not as described here.

Transferable Rights and Warrants

If the underlying equity issuer of the underlying equity or a basket equity issues transferable rights or warrants to all holders of such underlying equity or basket equity to subscribe for or purchase such

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underlying equity or basket equity at an exercise price per share that is less than the closing price of such underlying equity or basket equity on the trading day before the ex-dividend date for such issuance, then the calculation agent may adjust the initial price or trigger price of the underlying equity or the initial equity price of such basket equity (as the case may be) or any other terms of the Securities as the calculation agent determines appropriate to account for the economic effect of such issuance.

Reorganization Events

For any offering of the Securities in which the applicable underlying equity or a basket equity is common stock in a specific company (underlying stock), each of the following may be determined by the calculation agent to be a reorganization event:

(a) there occurs any reclassification or change of the underlying stock, including, without limitation, as a result of the issuance of tracking stock by the issuer of the underlying stock,

(b) the issuer of the underlying stock, or any surviving entity or subsequent surviving entity of such issuer (a successor entity), has been subject to a merger, combination or consolidation and is not the surviving entity,

(c) any statutory exchange of securities of the issuer of the underlying stock or any successor entity with another corporation occurs, other than pursuant to clause (b) above,

(d) the issuer of the underlying stock is liquidated or is subject to a proceeding under any applicable bankruptcy, insolvency or other similar law,

(e) the issuer of the underlying stock issues to all of its shareholders stock securities of a company other than the issuer of the underlying stock, other than in a transaction described in clauses (b), (c) or (d) above (a spin-off event), or

(f) a tender or exchange offer or going-private transaction is commenced for all the outstanding shares of the issuer of the underlying stock and is consummated for all or substantially all of such shares (an event in clauses (a) through (f), a reorganization event).

If a reorganization event other than a share-for-cash event or an issuer merger event (each as defined below) with respect to an underlying stock occurs, then the determination of the final price will be made by the calculation agent based upon the amount, type and value of property or properties whether securities, other property or a combination of securities, other property and cash that a hypothetical holder of the number of shares of the underlying stock prior to the reorganization event would have been entitled to receive in, or as a result of, the reorganization event. We refer to this new property as the distribution property. Such distribution property may consist of securities issued by a non-U.S. company and quoted and traded in a foreign currency. No interest will accrue on any distribution property.

If an offering of the Securities is linked to an underlying basket and a reorganization event occurs with respect to a basket equity, the required adjustment will be made with respect to that basket equity, as if it alone were the underlying stock. More specifically, the distribution property will only replace the affected basket equity in the determination of the final price by the calculation agent, taking into consideration the weight of the affected basket equity in the underlying basket, and no adjustment will be made with respect to the other unaffected basket equities.

For the purpose of making an adjustment required by a reorganization event, the calculation agent will determine the value of each type of distribution property. For any distribution property consisting of a security (including a security issued by a non-U.S. company and quoted and traded in a foreign currency), the calculation agent will use the closing price of the security on the relevant date of determination. The calculation agent may value other types of property in any manner it determines to be appropriate. If a holder of the applicable underlying stock may elect to receive different types or combinations of types of

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distribution property in the reorganization event, the distribution property will consist of the types and amounts of each type distributed to a holder of the applicable underlying stock that makes no election, as determined by the calculation agent.

If a reorganization event occurs with respect to an underlying stock and the calculation agent adjusts such underlying stock to consist of the distribution property as described above, the calculation agent will make further antidilution adjustments for any later events that affect the distribution property, or any component of the distribution property, constituting an adjusted underlying stock for that offering of the Securities. The calculation agent will do so to the same extent that it would make adjustments if the shares of the applicable underlying stock were outstanding and were affected by the same kinds of events. If a subsequent reorganization event affects only a particular component of the distribution property, the required adjustment will be made with respect to that component, as if it alone were the underlying stock.

For example, if an offering of the Securities is linked to one underlying stock and the respective issuer of the underlying stock merges into another company and each share of the underlying stock is converted into the right to receive two common shares of the surviving company and a specified amount of cash, the underlying stock for each Security in that particular offering will be adjusted to consist of two common shares of the surviving company and the specified amount of cash. The calculation agent will adjust the common share component of the adjusted underlying stock for each Security in the particular offering to reflect any later stock split or other event, including any later reorganization event, that affects the common shares of the surviving company, to the extent described in this section entitled Antidilution Adjustments, as if the common shares were issued by the respective issuer of the underlying stock. In that event, the cash component will not be adjusted but will continue to be a component of the underlying stock for that particular offering (with no interest adjustment).

The calculation agent will be solely responsible for determination and calculation of the distribution property if a reorganization event occurs and any amounts due at maturity of the Securities, including the determination of the cash value of any distribution property, if necessary.

If a reorganization event occurs, the distribution property (which may include securities issued by a non-U.S. company and quoted and traded in a foreign currency) distributed in, or as a result of, the event will be substituted for the applicable underlying stock as described above. Consequently, in this product supplement, references to an applicable underlying stock, underlying equity or basket equity, where applicable, mean any distribution property that is distributed in a reorganization event and comprises an adjusted underlying stock for the particular offering of the Securities. Similarly, references to the respective issuer of the affected underlying stock, underlying equity or basket equity include any surviving or successor entity in a reorganization event affecting that issuer.

If the distribution property consists of one or more securities issued by a non-U.S. company and quoted and traded in a foreign currency (the non-U.S. securities), then for all purposes, including the determination of the value of the distribution property (which may be affected by the closing price of the non-U.S. securities) on the final valuation date, the closing price of such non-U.S. securities as of the relevant date of determination will be converted to U.S. dollars using the applicable exchange rate as described below, unless otherwise specified in the applicable pricing supplement.

On any date of determination, the applicable exchange rate will be the WM/Reuters Closing spot rate of the local currency of such non-U.S. securities relative to the U.S. dollar as published by Thomson Reuters PLC (Reuters) on the relevant page for such rate, or Bloomberg page WMCO, in each case at approximately 4:15 P.M., London time, for such date of determination. However, if such rate is not displayed on the relevant Reuters page or Bloomberg page WMCO on any date of determination, the applicable exchange rate on such day will equal the average (mean) of the bid quotations in New York City received by the calculation agent at approximately 3:00 P.M., New York City time, on such date of

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determination, from as many recognized foreign exchange dealers (provided that each such dealer commits to execute a contract at its applicable bid quotation), but not exceeding three, as will make such bid quotations available to the calculation agent for the purchase of the applicable foreign currency for U.S. dollars for settlement on the final valuation date in the aggregate amount of the applicable foreign currency payable to holders of the Securities. If the calculation agent is unable to obtain at least one such bid quotation, the calculation agent will determine the exchange rate.

If (i) a reorganization event occurs with respect to an underlying stock and the relevant distribution property consists solely of cash (a share-for-cash event) or (ii) the issuer of an underlying stock or any successor entity becomes subject to a merger or consolidation with UBS AG or any of its affiliates (an issuer merger event), the calculation agent may select a substitute security (as defined under Delisting or Suspension of Trading of an Underlying Stock below) to replace such underlying stock that is affected by any such share-for-cash event or issuer merger event (the original underlying stock) after the close of the principal trading session on the trading day that is on or immediately following the announcement date of such share-for-cash event or issuer merger event, as applicable. The substitute security will be deemed to be the relevant underlying stock and the calculation agent will determine the initial price and trigger price (in the case of an underlying equity) or the relevant initial equity price (in the case of a basket equity) by reference to the substitute security. If the substitute security is issued by a non-U.S. company and quoted and traded in a foreign currency, then for all purposes, the closing price of the substitute security on any trading day will be converted to U.S. dollars using the applicable exchange rate as described above.

Upon the occurrence of a share-for-cash event or an issuer merger event, if the calculation agent determines that no substitute security comparable to the original underlying stock exists, then the calculation agent will deem the closing price of the original underlying stock on the trading day immediately prior to the announcement date of the share-for-cash event or issuer merger event, as applicable, to be the closing price of the underlying stock on each remaining trading day to, and including, the final valuation date.

If an ADS is serving as the underlying equity or a basket equity and the foreign stock represented by such ADS is subject to a reorganization event as described above, no adjustments described in this section will be made (1) if holders of ADSs are not eligible to participate in such reorganization event or (2) to the extent that the calculation agent determines that the foreign stock issuer or the depositary for the ADSs has made adjustments to account for the effects of such reorganization event. However, if holders of ADSs are eligible to participate in such reorganization event and the calculation agent determines that the foreign stock issuer or the depositary for the ADSs has not made adjustments to account for the effects of such reorganization event, the calculation agent may make any necessary adjustments to account for the effects of such reorganization event.

If an offering of the Securities is linked to an underlying basket and two or more issuers of basket equities are subject to a merger, combination or consolidation with each other, irrespective of the foregoing, the distribution property that results from such merger, combination or consolidation will replace all of the affected basket equities (with no adjustment to any basket equities not affected by the merger, combination or consolidation). No further adjustments will be made to the composition of the underlying basket and no replacement basket equity will be added to the underlying basket. The calculation agent will, as soon as reasonably practicable after it becomes aware of such event, determine whether such merger, combination or consolidation has a diluting or concentrative effect on the theoretical value of the affected basket equities, and, if so, will make the corresponding adjustment(s), if any, to any relevant initial equity prices, and any other relevant term, as the calculation agent determines appropriate to account for that diluting or concentrative effect.

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Delisting or Suspension of Trading of an Underlying Stock

If an underlying stock is delisted or trading of the underlying stock is suspended on the primary exchange for such underlying stock, and such underlying stock is immediately re-listed or approved for trading on a successor exchange which is a major U.S. securities exchange registered under the Exchange Act as determined by the calculation agent (a successor exchange), then such underlying stock will continue to be deemed the underlying equity.

If a common stock serving as the underlying equity or a basket equity is delisted or trading of such underlying stock is suspended on the primary exchange for such underlying stock, and is not immediately re-listed or approved for trading on a successor exchange, then the calculation agent may select a substitute security. A substitute security will be the common stock or ADS, which is listed or approved for trading on a major U.S. exchange or market, of a company then included in the same primary industry classification as the issuer of the applicable underlying stock as published on the Bloomberg Professional ® service page RV or any successor thereto that (i) satisfies all regulatory standards applicable to equity-linked securities at the time of such selection, (ii) is not subject to a hedging restriction and (iii) is the most comparable to the issuer of the applicable underlying stock as determined by the calculation agent based upon various criteria including but not limited to market capitalization, stock price volatility and dividend yield (the substitute selection criteria). A company is subject to a hedging restriction if UBS AG or any of its affiliates is subject to a trading restriction under the trading restriction policies of UBS AG or any of its affiliates that would materially limit the ability of UBS AG or any of its affiliates to hedge the Securities with respect to the common stock or ADSs of such company. If there is no issuer with the same primary industry classification as the issuer of the applicable underlying stock that meets the requirements described above, the calculation agent may select a substitute security that is a common stock or ADS then listed or approved for trading on a major U.S. exchange or market (subject to the same absence of hedging restriction requirement and substitute selection criteria), from the following categories: first, issuers with the same primary Sub-Industry classification as the issuer of the applicable underlying stock; second, issuers with the same primary Industry classification as the issuer of the applicable underlying stock; and third, issuers with the same primary Industry Group classification as the issuer of the applicable underlying stock. Sub-Industry, Industry and Industry Group have the meanings assigned by Standard & Poors, a subsidiary of the McGraw-Hill Companies, Inc., or any successor thereto for assigning Global Industry Classification Standard (GICS) Codes. If the GICS Code system of classification is altered or abandoned, the calculation agent may select an alternate classification system and implement similar procedures. The substitute security will be deemed to be the underlying equity or relevant basket equity (as the case may be) and the calculation agent will determine the initial price and the trigger price or the relevant initial equity price (as the case may be) by reference to the substitute security. If the substitute security is issued by a non-U.S. company and quoted and traded in a foreign currency, then for all purposes, including the determination of the final price, the closing price of the substitute security on any date of determination will be converted to U.S. dollars using the applicable exchange rate as described under Antidilution Adjustment Reorganization Events on page PS- 37 .

If the applicable underlying stock is delisted or trading of the applicable underlying stock is suspended and the calculation agent determines that no substitute security comparable to the applicable underlying stock exists, then the calculation agent will deem the closing price of the applicable underlying stock on the trading day immediately prior to its delisting or suspension to be the closing price of the applicable underlying stock on each remaining trading day to, and including, the final valuation date.

Delisting of ADSs or Termination of ADS Facility

If an ADS serving as the underlying equity or a basket equity is no longer listed or admitted to trading on a U.S. securities exchange registered under the Exchange Act nor included in the OTC Bulletin Board Service operated by FINRA, or if the ADS facility between the issuer of the foreign stock and the ADS

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depositary is terminated for any reason, then, on and after the date such ADS is no longer so listed or admitted to trading or the date of such termination, as applicable (the change date), the foreign stock will be deemed to be the underlying equity or basket equity (as the case may be) and the calculation agent will determine the initial price and the trigger price or the relevant initial equity price (as the case may be) by reference to the substitute security. To the extent that the foreign stock substituted for the original underlying equity or basket equity represents more than or less than one share of such foreign stock, the calculation agent may modify any terms as necessary to ensure an equitable result including, but not limited to, the initial price and the trigger price. On and after the change date, for all purposes, including the determination of the final price, the closing price of the foreign stock will be converted to U.S. dollars using the applicable exchange rate as described under Antidilution Adjustment Reorganization Events on page PS- 37 .

Delisting, Discontinuance or Modification of an ETF

If an ETF serving as the underlying equity or a basket equity (original ETF) is delisted or trading of such ETF is suspended on the primary exchange for such ETF, and such ETF is immediately re-listed or approved for trading on a successor exchange, then such ETF will continue to be deemed the underlying equity or basket equity (as the case may be).

If an ETF serving as the underlying equity or a basket equity is delisted or trading of such ETF is suspended on the primary exchange for such ETF, and such ETF is not immediately re-listed or approved for trading on a successor exchange, then the calculation agent may select a substitute ETF. A substitute ETF will be the share of the exchange traded fund, which is listed or approved for trading on a major U.S. exchange or market, whose exchange traded fund (i) satisfies all regulatory standards applicable to equity-linked securities at the time of such selection, (ii) has the same underlying index as the original ETF or underlying assets of the original ETF and (iii) is the most comparable to the original ETF as determined by the calculation agent based upon various criteria including but not limited to market capitalization, price volatility and dividend yield (the substitute selection criteria). The substitute ETF will be deemed to be the underlying equity or basket equity (as the case may be) and the calculation agent will determine the initial price and the trigger price or the relevant initial equity price (as the case may be) by reference to the substitute ETF.

If the calculation agent determines that no substitute ETF comparable to the original ETF exists, then the calculation agent may determine the closing price of the original ETF by reference to a basket comprised of (i) the underlying assets of the original ETF or (ii) other securities, futures contracts, commodities or other assets comparable to the underlying assets of the original ETF based upon the substitute selection criteria, in each case as determined by the calculation agent (a replacement basket). The replacement basket will be deemed to be the relevant underlying equity or relevant basket equity (as the case may be) and the calculation agent will determine the initial price and trigger price or the relevant initial equity price (as the case may be) by reference to the replacement basket.

If the calculation agent determines that no substitute ETF or replacement basket comparable to the original ETF exists, then the calculation agent will deem the closing price of the original ETF on the trading day immediately prior to its delisting or suspension to be the closing price of the original ETF on each remaining trading day to, and including, the final valuation date.

If at any time the underlying index or the underlying assets of an ETF serving as the underlying equity is changed in a material respect, or if the ETF in any other way is modified so that the price of its shares do not, in the opinion of the calculation agent, fairly represent the price of the shares of the ETF had those changes or modifications not been made, then, from and after that time, the calculation agent will make those calculations and adjustments as may be necessary in order to account for the economic effect of such changes or modifications, and determine the closing prices of the affected underlying equity or basket equity by reference to the price of the shares of the ETF, as adjusted. Accordingly, if the ETF is

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modified in a way that the price of its shares is a fraction of what it would have been if it had not been modified, then the calculation agent will adjust the price in order to arrive at a price of the shares of the ETF as if it had not been modified. The calculation agent also may determine that no adjustment is required by the modification of the method of calculation.

Redemption Price Upon Optional Tax Redemption

We have the right to redeem your Securities in the circumstances described under Description of Debt Securities We May Offer Optional Tax Redemption in the accompanying prospectus. If we exercise this right with respect to your Securities, the redemption price of the Securities will be determined by the calculation agent in a manner reasonably calculated to preserve your and our relative economic position.

Default Amount on Acceleration

If an event of default occurs and the maturity of your Securities is accelerated, we will pay the default amount in respect of the principal of your Securities at maturity. We describe the default amount below under Default Amount.

For the purpose of determining whether the holders of our Series A Medium-Term Notes, of which the Securities are a part, are entitled to take any action under the indenture, we will treat the outstanding principal amount of the Securities as the outstanding principal amount of that Securities. Although the terms of the Securities may differ from those of the other Series A Medium-Term Notes, holders of specified percentages in principal amount of all Series A Medium-Term Notes, together in some cases with other series of our debt securities, will be able to take action affecting all the Series A Medium-Term Notes, including the Securities. This action may involve changing some of the terms that apply to the Series A Medium-Term Notes, accelerating the maturity of the Series A Medium-Term Notes after a default or waiving some of our obligations under the indenture. We discuss these matters in the accompanying prospectus under Description of Debt Securities We May Offer Default, Remedies and Waiver of Default and Description of Debt Securities We May Offer Modification and Waiver of Covenants.

Default Amount

The default amount for your Securities on any day will be an amount, in U.S. Dollars for the principal of your Securities, equal to the cost of having a qualified financial institution, of the kind and selected as described below, expressly assume all of our payment and other obligations with respect to your Securities as of that day and as if no default or acceleration had occurred, or to undertake other obligations providing substantially equivalent economic value to you with respect to your Securities. That cost will equal:

¨ the lowest amount, as determined by the calculation agent in the manner described in the following paragraph, that a qualified financial institution would charge to effect this assumption or undertaking; plus

¨ the reasonable expenses, including reasonable attorneys fees, incurred by the holders of your Securities in preparing any documentation necessary for this assumption or undertaking.

During the default quotation period for your Securities, which we describe below, the holders of your Securities and/or we may request a qualified financial institution to provide a quotation of the amount it would charge to effect this assumption or undertaking. If either party obtains a quotation, it must notify the other party in writing of the quotation. The amount referred to in the first bullet point above will equal the lowest or, if there is only one, the only quotation obtained, and as to which notice is so given, during the default quotation period. With respect to any quotation, however, the party not obtaining the quotation may object, on reasonable and significant grounds, to the assumption or undertaking by the qualified financial institution providing the quotation and notify the other party in

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writing of those grounds within two (2) business days after the last day of the default quotation period, in which case that quotation will be disregarded in determining the default amount.

Default Quotation Period

The default quotation period is the period beginning on the day the default amount first becomes due (the due date) and ending on the third business day after that day, unless:

¨ no quotation of the kind referred to above is obtained; or

¨ every quotation of that kind obtained is objected to within five (5) business days after the due date as described above.

If either of these two events occurs, the default quotation period will continue until the third business day after the first business day on which prompt notice of a quotation is given as described above. If that quotation is objected to as described above within five (5) business days after that first business day, however, the default quotation period will continue as described in the prior sentence and this sentence.

Qualified Financial Institutions

For the purpose of determining the default amount at any time, a qualified financial institution must be a financial institution organized under the laws of any jurisdiction in the United States of America, Europe or Japan, which at that time has outstanding debt obligations with a stated maturity of one year or less from the date of issue and rated either:

¨ A-1 or higher by Standard & Poors, a division of The McGraw-Hill Companies, Inc., or any successor, or any other comparable rating then used by that rating agency; or

¨ P-1 or higher by Moodys Investors Service, Inc. or any successor, or any other comparable rating then used by that rating agency.

Manner of Payment and Delivery

Any payment on or delivery of your Securities at maturity will be made to accounts designated by you or the holder of your Securities and approved by us, or at the office of the trustee in New York City, but only when your Securities are surrendered to the trustee at that office. We may also make any payment or delivery in accordance with the applicable procedures of the depositary.

Trading Day

A trading day is a business day, as determined by the calculation agent, on which trading is generally conducted on the primary U.S. securities exchange(s) or market(s) on which the underlying equity or any basket equity is listed or admitted for trading or, with respect to a security issued by a foreign issuer that is not listed or admitted to trading on a U.S. securities exchange or market, a day, as determined by the calculation agent, on which trading is generally conducted on the primary non-U.S. securities exchange or market on which such security is listed or admitted for trading.

Business Day

When we refer to a business day with respect to your Securities, we mean any day that is a business day of the kind described in Description of Debt Securities We May Offer Payment Mechanics for Debt Securities in the accompanying prospectus.

Modified Business Day

When we refer to a modified business day with respect to your Securities, we mean any day that is a modified business day of the kind described in Description of Debt Securities We May Offer Payment Mechanics for Debt Securities in the attached prospectus. As described in the prospectus, any payment

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on your Securities that would otherwise be due on a day that is not a business day may instead be paid on the next day that is a business day, with the same effect as if paid on the original due date, except as described under Maturity Date and Final Valuation Date; Equity Valuation Dates above.

Role of Calculation Agent

Our affiliate, UBS Securities LLC, will serve as the calculation agent. We may change the calculation agent after the original issue date of your Securities without notice. The calculation agent will make all determinations regarding the value of your Securities at maturity, market disruption events, antidilution adjustments, business days, trading days, the default amount, the underlying return, the initial price, the final price and the amount payable in respect of your Securities, in its sole discretion. All determinations of the calculation agent will be final and binding on you and us, without any liability on the part of the calculation agent. You will not be entitled to any compensation from us for any loss suffered as a result of any of the above determinations by the calculation agent.

Booking Branch

The booking branch of UBS AG will be specified in the applicable pricing supplement.

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Use of Proceeds and Hedging

We will use the net proceeds we receive from the sale of the Securities for the purposes we describe in the accompanying prospectus under Use of Proceeds. We or our affiliates may also use those proceeds in transactions intended to hedge our obligations under the Securities as described below.

In anticipation of the sale of the Securities, we or our affiliates expect to enter into hedging transactions involving purchases of the underlying equity or basket equities, the underlying assets of an ETF, listed and/or over-the-counter options, futures or exchange-traded funds on the underlying equity, basket equities or the underlying assets of an ETF prior to and/or on the applicable trade date. From time to time, we or our affiliates may enter into additional hedging transactions or unwind those we have entered into. Consequently, with regard to your Securities, from time to time, we or our affiliates may:

¨ acquire or dispose of long or short positions of the underlying equity, basket equities or the underlying assets of an ETF;

¨ acquire or dispose of long or short positions in listed or over-the-counter options, futures, exchange-traded funds or other instruments based on the price of the underlying equity, basket equities or the underlying assets of an ETF; or

¨ acquire or dispose of long or short positions in listed or over-the-counter options, futures or exchange-traded funds or other instruments based on indices designed to track the performance of any components of the U.S. or foreign equity markets; or

¨ any combination of the above three.

We or our affiliates may acquire a long or short position in securities similar to the Securities from time to time and may, in our or their sole discretion, hold or resell those securities.

We or our affiliates may close out our or their hedge position relating to the Securities on or before the final valuation date for your Securities. That step may involve (i) sales or purchases of the underlying equity, basket equities or the underlying assets of an ETF, (ii) listed or over-the-counter options, futures, exchange-traded funds or other instruments on the underlying equity, basket equities or the underlying assets of an ETF or (iii) listed or over-the-counter options, futures, exchange-traded funds or other instruments based on indices designed to track the performance of the underlying equity or basket equities or markets relating to the underlying equity or basket equities. No holder of the Securities will have any rights or interest in our hedging activity or any positions we may take in connection with our hedging activity.

The hedging activity discussed above may adversely affect the market value of your Securities from time to time and the payment at maturity of your Securities. See Risk Factors beginning on page PS- 15 of this product supplement for a discussion of these adverse effects.

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Supplemental U.S. Tax Considerations

The following is a general description of certain United States federal tax considerations relating to the Securities. It does not purport to be a complete analysis of all tax considerations relating to the Securities. Prospective purchasers of the Securities should consult their tax advisors as to the consequences under the tax laws of the country of which they are resident for tax purposes and the tax laws of the United States of acquiring, holding and disposing of the Securities and receiving payments of principal and/or other amounts under the Securities. This summary is based upon the law as in effect on the date of this product supplement and is subject to any change in law that may take effect after such date.

The discussion below supplements the discussion under U.S. Tax Considerations in the attached prospectus. This discussion applies to you only if you are the original investor in the Securities and you hold your Securities as capital assets for tax purposes. This section does not apply to you if you are a member of a class of holders subject to special rules, such as:

¨ a dealer in securities,

¨ a trader in securities that elects to use a mark-to-market method of accounting for your securities holdings,

¨ a bank,

¨ a regulated investment company or a real estate investment trust

¨ a life insurance company,

¨ a tax-exempt organization,

¨ a person that owns Securities as part of a straddle or a hedging or conversion transaction for tax purposes, or

¨ a United States holder (as defined below) whose functional currency for tax purposes is not the U.S. dollar.

This discussion is based on the Internal Revenue Code of 1986, as amended (the Code), its legislative history, existing and proposed regulations under the Code, published rulings and court decisions, all as currently in effect. These laws are subject to change, possibly on a retroactive basis.

Except as otherwise noted under Non-United States Holders below, this discussion is only applicable to you if you are a United States holder. You are a United States holder if you are a beneficial owner of a Security and you are: (i) a citizen or resident of the United States, (ii) a domestic corporation, (iii) an estate whose income is subject to United States federal income tax regardless of its source, or (iv) a trust if a United States court can exercise primary supervision over the trusts administration and one or more United States persons are authorized to control all substantial decisions of the trust.

If a partnership holds the Securities, the United States federal income tax treatment of a partner will generally depend on the status of the partner and the tax treatment of the partnership. A partner in a partnership holding the Securities should consult its tax advisor with regard to the United States federal income tax treatment of an investment in the Securities.

NO STATUTORY, JUDICIAL OR ADMINISTRATIVE AUTHORITY DIRECTLY DISCUSSES HOW THE SECURITIES SHOULD BE TREATED FOR UNITED STATES FEDERAL INCOME TAX PURPOSES. AS A RESULT, THE UNITED STATES FEDERAL INCOME TAX CONSEQUENCES OF YOUR INVESTMENT IN THE SECURITIES ARE UNCERTAIN. ACCORDINGLY, WE URGE YOU TO CONSULT YOUR TAX ADVISOR AS TO THE TAX CONSEQUENCES OF HAVING AGREED

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TO THE REQUIRED TAX TREATMENT OF YOUR SECURITIES DESCRIBED BELOW AND AS TO THE APPLICATION OF STATE, LOCAL OR OTHER TAX LAWS TO YOUR INVESTMENT IN YOUR SECURITIES.

In the opinion of our counsel, Cadwalader, Wickersham & Taft LLP, it would be reasonable to treat your Securities as a pre-paid derivative contract with respect to the underlying equity or basket and the terms of the Securities require you and us (in the absence of a statutory, regulatory, administrative or judicial ruling to the contrary) to treat the Securities for all tax purposes in accordance with such characterization. If the Securities are so treated, subject to the discussion below of the constructive ownership rules and PFICs, you should generally not accrue any income with respect to the underlying equity or underlying basket during the term of the Securities and you should generally recognize capital gain or loss upon the sale, exchange or maturity of your Securities in an amount equal to the difference between the amount realized at such time and your tax basis in the Securities. In general, your tax basis in your Securities will be equal to the price you paid for them. Capital gain of a noncorporate United States holder is generally taxed at preferential rates where the property is held for more than one year. The deductibility of capital losses is subject to limitations.

If a security references an underlying equity that is treated as, or an underlying basket of equities that includes equities that are treated as, a real estate investment trust (REIT), a partnership, a passive foreign investment company (PFIC), a regulated investment company such as an ETF, or otherwise as a pass-thru entity for purposes of section 1260 of the Code, it is possible that the constructive ownership transaction rules of section 1260 of the Code may apply. Under the constructive ownership rules, if an investment in the securities is treated as a constructive ownership transaction, any long-term capital gain recognized by a U.S. holder in respect of certain securities will be recharacterized as ordinary income to the extent such gain exceeds the amount of net underlying long-term capital gain (as defined in Section 1260 of the Code) of the U.S. holder (the Excess Gain). In addition, an interest charge will also apply to any deemed underpayment of tax in respect of any Excess Gain to the extent such gain would have resulted in gross income inclusion for the U.S. holder in taxable years prior to the taxable year of the sale, exchange or maturity of the security (assuming such income accrued such that the amount in each successor year is equal to the income in the prior year increased at a constant rate equal to the applicable federal rate as of the date of sale, exchange or maturity of the security). Although the matter is not clear, there exists a risk that an investment in Securities that are linked to shares of an ETF, PFIC or other pass thru entity or to a basket that contains shares of an ETF, PFIC or other pass thru entity will be treated as a constructive ownership transaction. If such treatment applies, it is not clear to what extent any long-term capital gain recognized by a U.S. holder in respect of a Security will be recharacterized as ordinary income and subject to the interest charge described above. Moreover, because the U.S. holder does not share in distributions made on ETFs, PFICs or other pass thru entities or baskets of ETFs, PFICs or other pass thru entities referenced by a Security, such distributions should be excluded from the calculation of the amount and character of gain, if any, that would have been realized had the U.S. holder held the shares of the ETFs, PFICs, or pass thru entities directly. Accordingly, you should consult your tax advisor regarding the potential application of the constructive ownership rules to an investment in Securities.

In general, if a U.S. taxpayer holds an interests in a PFIC, such U.S. taxpayer is required to report any gain on disposition of an interest in such PFIC as ordinary income, rather than as capital gain, and the taxpayer is subject to tax on such gain in the year such gain is recognized at the highest ordinary income tax rate and liable for a non-deductible interest charge at the federal underpayment rate as if the gain had been earned ratably over each day in such taxpayers holding period and such tax liabilities had been due with respect to each prior year in the taxpayers holding periods. In the event that the Securities reference any PFIC or an ETF or a basket of ETFs that owns any shares in a PFIC, the application of the PFIC rules to the Securities would be unclear, and it is possible that U.S. holders of Securities could be subject

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to the PFIC rules to the extent that the Securities directly or indirectly references shares in one or more PFICs. Accordingly, you should consult your tax advisor regarding the potential application of the PFIC rules to an investment in the Securities.

Alternative Treatments . Because of the absence of authority regarding the appropriate tax characterization of your Securities, it is possible that the Internal Revenue Service could seek to characterize your Securities in a manner that results in tax consequences to you that are different from those described above. The Internal Revenue Service has released a notice that may affect the taxation of holders of the Securities. According to the notice, the Internal Revenue Service and the Treasury Department are actively considering whether the holder of an instrument such as the Securities should be required to accrue ordinary income on a current basis, and they are seeking taxpayer comments on the subject. It is not possible to determine what guidance they will ultimately issue, if any. It is possible, however, that under such guidance, holders of the Securities will ultimately be required to accrue income currently and this could be applied on a retroactive basis. The Internal Revenue Service and the Treasury Department are also considering other relevant issues, including whether additional gain or loss from such instruments should be treated as ordinary or capital, whether foreign holders of such instruments should be subject to withholding tax on any deemed income accruals, and whether the special constructive ownership rules of Section 1260 of the Code should be applied to such instruments. Holders are urged to consult their tax advisors concerning the significance, and the potential impact, of the above considerations. Except to the extent otherwise required by law, UBS intends to treat your Securities for United States federal income tax purposes in accordance with the treatment described above unless and until such time as the Treasury Department and Internal Revenue Service determine that some other treatment is more appropriate.

If the Securities have a term greater than one year, it is possible that the Securities could be treated as a debt instrument subject to the special tax rules governing contingent debt instruments. If the Securities are so treated, you would be required to accrue interest income over the term of your Securities based upon the yield at which we would issue a non-contingent fixed-rate debt instrument with other terms and conditions similar to your Securities. You would recognize gain or loss upon the sale or maturity of your Securities in an amount equal to the difference, if any, between the amount you receive at such time and your adjusted basis in your Securities. In general, your adjusted basis in your Securities would be equal to the amount you paid for your Securities, increased by the amount of interest you previously accrued with respect to your Securities. Any gain you recognize upon the sale, redemption or maturity of your Securities would be ordinary income and any loss recognized by you at such time would be ordinary loss to the extent of interest you included in income in the current or previous taxable years in respect of your Securities, and thereafter, would be capital loss.

Similarly, if the Securities have a term of one year or less, it is possible that the Securities could be treated as a debt instrument subject to the special rules for short-term debt instruments. You should consult your tax advisor as to the tax consequences of such characterization.

The Internal Revenue Service could also possibly assert that (i) you should be treated as owning the components of the underlying equity or the underlying basket equities, (ii) you should be required to recognize taxable gain upon a rollover or rebalancing, if any, of the components of the underlying equity or basket equities, (iii) any gain or loss that you recognize upon the exchange or maturity of the Securities should be treated as ordinary gain or loss, (iv) you should be required to accrue interest income

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over the term of your Securities or (v) you should be required to include in ordinary income an amount equal to any increase in the underlying equity or underlying basket that is attributable to ordinary income that is realized in respect of the components of the underlying equity or basket equities, such as interest, dividends or net-rental income. You should consult your tax advisor as to the tax consequences of such characterization and any possible alternative characterizations of your Securities for U.S. federal income tax purposes.

Medicare Tax on Net Investment Income . Beginning in 2013, United States holders that are individuals, estates, and certain trusts will be subject to an additional 3.8% tax on all or a portion of their net investment income, which may include any gain realized with respect to the Securities, to the extent of their net investment income that when added to their other modified adjusted gross income, exceeds $200,000 for an unmarried individual, $250,000 for a married taxpayer filing a joint return (or a surviving spouse), or $125,000 for a married individual filing a separate return. United States holders should consult their tax advisors with respect to their consequences with respect to the 3.8% Medicare tax.

Information Reporting with respect to Foreign Financial Assets . Under recently enacted legislation, United States holders that are individuals (and to the extent provided in future regulations, entities) that own specified foreign financial assets may be required to file information with respect to such assets with their U.S. federal income tax returns, especially if such assets are held outside the custody of a U.S. financial institution. Specified foreign financial assets include stock or other securities issued by foreign persons and any other financial instrument or contract that has an issuer or counterparty that is not a U.S. person. Individuals that fail to provide such information are subject to a penalty of $10,000 for the taxable year. You are urged to consult your tax advisor as to the application of this legislation to your ownership of the Securities.

Treasury Regulations Requiring Disclosure of Reportable Transactions . Treasury regulations require United States taxpayers to report certain transactions (Reportable Transactions) on Internal Revenue Service Form 8886. An investment in the Securities or a sale of the Securities should generally not be treated as a Reportable Transaction under current law, but it is possible that future legislation, regulations or administrative rulings could cause your investment in the Securities or a sale of the Securities to be treated as a Reportable Transaction. You should consult with your tax advisor regarding any tax filing and reporting obligations that may apply in connection with acquiring, owning and disposing of Securities.

Backup Withholding and Information Reporting . If you are a noncorporate United States holder, information reporting requirements, on Internal Revenue Service Form 1099, generally will apply to:

¨ payments of principal and interest on a Security within the United States, including payments made by wire transfer from outside the United States to an account you maintain in the United States, and

¨ the payment of the proceeds from the sale of a Security effected at a United States office of a broker.

Additionally, backup withholding will apply to such payments if you are a noncorporate United States holder that:

¨ fails to provide an accurate taxpayer identification number,

¨ is notified by the Internal Revenue Service that you have failed to report all interest and dividends required to be shown on your federal income tax returns, or

¨ in certain circumstances, fails to comply with applicable certification requirements.

Under recent legislation, reporting requirements and backup withholding may also apply to certain payments to corporate United States holders.

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Payment of the proceeds from the sale of a Security effected at a foreign office of a broker generally will not be subject to information reporting or backup withholding. However, a sale of a Security that is effected at a foreign office of a broker will generally be subject to information reporting and backup withholding if:

¨ the proceeds are transferred to an account maintained by you in the United States,

¨ the payment of proceeds or the confirmation of the sale is mailed to you at a United States address, or

¨ the sale has some other specified connection with the United States as provided in U.S. Treasury regulations.

In addition, a sale of a Security effected at a foreign office of a broker will generally be subject to information reporting if the broker is:

¨ a United States person,

¨ a controlled foreign corporation for United States tax purposes,

¨ a foreign person 50% or more of whose gross income is effectively connected with the conduct of a United States trade or business for a specified three-year period, or

¨ a foreign partnership, if at any time during its tax year:

¨ one or more of its partners are U.S. persons, as defined in U.S. Treasury regulations, who in the aggregate hold more than 50% of the income or capital interest in the partnership, or

¨ such foreign partnership is engaged in the conduct of a United States trade or business.

Backup withholding will apply if the sale is subject to information reporting and the broker has actual knowledge that you are a United States person.

Non-United States Holders . If you are not a United States holder, then, subject to the discussion below regarding Section 871(m) and FATCA, you should generally not be subject to United States withholding tax with respect to payments on your Securities but you may be subject to generally applicable information reporting and backup withholding requirements with respect to payments on your Securities unless you comply with certain certification and identification requirements as to your foreign status including providing an IRS form W-8BEN. Gain from the sale or exchange of the Securities or settlement at maturity generally will not be subject to U.S. tax unless such gain is effectively connected with a trade or business conducted by the non-U.S. holder in the United States or unless the non-U.S. holder is a non-resident alien and is present in the United States for 183 days or more during the taxable year of such sale, exchange or settlement and certain other conditions are satisfied.

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Foreign Account Tax Compliance Act

The Foreign Account Tax Compliance Act (FATCA) was enacted on March 18, 2010, and imposes a 30% U.S. withholding tax on withholdable payments (i.e., certain U.S. source payments, including interest (and OID), dividends, other fixed or determinable annual or periodical gain, profits, and income, and on the gross proceeds from a disposition of property of a type which can produce U.S. source interest of dividends) and pass-thru payments (i.e., certain payments attributable to withholdable payments) made to certain foreign financial institutions (and certain of their affiliates) unless the payee foreign financial institution agrees, among other things, to disclose the identity of any U.S. individual with an account of the institution (or the relevant affiliate) and to annually report certain information about such account. FATCA also requires withholding agents making withholdable payments to certain foreign entities that do not disclose the name, address, and taxpayer identification number of any substantial U.S. owners (or certify that they do not have any substantial United States owners) to withhold tax at a rate of 30%.

Pursuant to proposed Treasury regulations, the withholding and reporting requirements will generally apply to certain withholdable payments made after December 31, 2013, certain gross proceeds on sale or disposition occurring after December 31, 2014, and certain pass-thru payments made after December 31, 2016. If the proposed Treasury Department regulations are finalized in their current from, this withholding tax would not be imposed on payments pursuant to obligations that are outstanding on January 1, 2013 (and are not materially modified after December 31, 2012). If, however, withholding is required as a result of future guidance, we (and any paying agent) will not be required to pay additional amounts with respect to the amounts so withheld.

Significant aspects of the application of FATCA are not currently clear and the above description is based on proposed regulations and interim guidance. Investors should consult their own advisors about the application of FATCA, in particular if they may be classified as financial institutions under the FATCA rules.

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ERISA Considerations

We, UBS Securities LLC, UBS Financial Services Inc. and other of our affiliates may each be considered a party in interest within the meaning of the Employee Retirement Income Security Act of 1974, as amended (ERISA), or a disqualified person (within the meaning of Section 4975 of the Internal Revenue Code of 1986, as amended (the Code)) with respect to an employee benefit plan that is subject to ERISA and/or an individual retirement account, Keogh plan or other plan or account that is subject to Section 4975 of the Code (Plan). The purchase of the Securities by a Plan with respect to which UBS Securities LLC, UBS Financial Services Inc. or any of our affiliates acts as a fiduciary as defined in Section 3(21) of ERISA and/or Section 4975 of the Code (Fiduciary) would constitute a prohibited transaction under ERISA or the Code unless acquired pursuant to and in accordance with an applicable exemption. The purchase of the Securities by a Plan with respect to which UBS Securities LLC, UBS Financial Services Inc. or any of our affiliates does not act as a Fiduciary but for which any of the above entities does provide services could also be prohibited, but one or more exemptions may be applicable. Any person proposing to acquire any Securities on behalf of a Plan should consult with counsel regarding the applicability of the prohibited transaction rules and the applicable exemptions thereto. The U.S. Department of labor has issued five prohibited transaction class exemptions (The PTCEs) that may provide exemptive relief for prohibited transactions that may arise from the purchase or holding of the Securities. These exemptions are PTCE 84-14 (for transactions determined by independent qualified professional asset managers), 90-1 (for insurance company pooled separate accounts), 91-38 (for bank collective investment funds), 95-60 (for insurance company general accounts) and 96-23 (for transactions managed by in-house asset managers). Section 408(b)(17) of ERISA and Section 4975(d)(20) of the Code also provide an exemption for the purchase and sale of securities where neither UBS nor any of its affiliates have or exercise any discretionary authority or control or render any investment advice with respect to the assets of the Plan involved in the transaction and the Plan pays no more and receives no less than adequate consideration in connection with the transaction (the service provider exemption). Upon purchasing the Securities, a Plan will be deemed to have represented that the acquisition, holding and, to the extent relevant, disposition of the Securities is eligible for relief under PTCE 84-14, PTCE 90-1, PTCE 91-38, PTCE 95-60, PTCE 96-23, the service provider exemption or another applicable exemption. The discussion above supplements the discussion under Benefit Plan Investor Considerations in the accompanying prospectus.

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Supplemental Plan of Distribution (Conflicts of Interest)

Unless otherwise specified in the applicable pricing supplement, with respect to each Security to be issued, UBS will agree to sell to UBS Securities LLC and/or UBS Financial Services Inc., and UBS Securities LLC and UBS Financial Services Inc. (as the case may be) will agree to purchase from UBS, the aggregate principal amount of the Securities specified on the front cover of the applicable pricing supplement. UBS Securities LLC and/or UBS Financial Services Inc. intend to resell the offered Securities at the original issue price to public applicable to the offered Securities to be resold. UBS Securities LLC and UBS Financial Services Inc. may resell the Securities to securities dealers (the Dealers) at a discount from the original issue price applicable to the offered Securities of up to the underwriting discount set forth on the front cover of the applicable pricing supplement. In some cases, the Dealers may resell the Securities to other securities dealers who resell to investors and pay those other securities dealers all or part of the discount or commission they receive from UBS Securities LLC or UBS Financial Services Inc. In the future, we or our affiliates may repurchase and resell the offered Securities in market-making transactions. As described in more detail under Use of Proceeds and Hedging on page PS- 45 , we or one of our affiliates may enter into swap agreements or related hedge transactions with one of our other affiliates or unaffiliated counterparties in connection with the sale of the Securities. UBS and/or its affiliates may earn additional income as a result of payments pursuant to these swap or related hedge transactions. For more information about the plan of distribution and possible market-making activities, see Plan of Distribution in the accompanying prospectus.

UBS may use this product supplement and accompanying prospectus in the initial sale of any Securities. In addition, UBS, UBS Securities LLC, UBS Financial Services Inc. or any other affiliate of UBS may use this product supplement and accompanying prospectus in a market-making transaction for any Securities after their initial sale. In connection with any offering of the Securities, UBS, UBS Securities LLC, UBS Financial Services Inc., and any other affiliate of UBS or any other securities dealers may distribute this product supplement and accompanying prospectus electronically. Unless stated otherwise in the applicable confirmation of sale delivered by UBS or its agent, this product supplement and accompanying prospectus are being used in a market-making transaction.

Conflicts of Interest Each of UBS Securities LLC and UBS Financial Services Inc. is an affiliate of UBS and, as such, will have a conflict of interest in an offering of the Securities within the meaning of FINRA Rule 5121. In addition, UBS will receive the net proceeds (excluding the underwriting discount) from any public offering of the Securities, thus creating an additional conflict of interest within the meaning of FINRA Rule 5121. Consequently, each offering will be conducted in compliance with the provisions of Rule 5121. Neither UBS Securities LLC nor UBS Financial Services Inc. is permitted to sell the Securities in an offering to an account over which it exercises discretionary authority without the prior specific written approval of the accountholder.

PS-53

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UBS AG Capital/Financing Update 2012

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UBS AG — Capital/Financing Update 2012

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UBS AG Capital/Financing Update 2012