Subject to Completion

Dated May 2, 2019

PRELIMINARY TERMS SUPPLEMENT

Filed Pursuant to Rule 424(b)(2)

Registration Statement No. 333-225551

Preliminary Terms Supplement

UBS AG Trigger Autocallable Optimization Securities

UBS AG $ Securities Linked to the shares of The SPDR® S&P® Regional Banking ETF due on or about November 5, 2020

Indicative Terms

Issuer

UBS AG, London Branch

Principal Amount

$10.00 per Security. The Securities are offered at a minimum investment of 100 Securities at $10.00 per Security (representing a $1,000 investment) and integral multiples of $10.00 in excess thereof.

Term

Approximately 18 months, unless called earlier.

Underlying Asset

The shares of The SPDR® S&P® Regional Banking ETF

Call Feature

The Securities will be called if the closing price of the Underlying Asset on any observation date is equal to or greater than the initial price. If the Securities are called, UBS will pay you on the applicable call settlement date a cash payment per Security equal to the call price for the applicable observation date.

Observation Dates

As specified in Call Price below.

Call Return

The call return increases the longer the Securities are outstanding and is based upon the call return rate.

Call Return Rate

6.78% - 7.41% per annum (or approximately 1.695% to 1.852% per outstanding quarter). The actual call return rate will be set at the time the trade is placed on the trade date.

Call Price

The call price equals the principal amount per Security plus the applicable call return.

The table below assumes a call return rate of 6.78% per annum. The actual call return rate will be set at the time the trade is placed on the trade date. Amounts in the table below may have been rounded for ease of analysis.

Observation Date*

Call Return

Call Price (per Security)

02-Aug-2019

1.695%

$10.1695

04-Nov-2019

3.390%

$10.3390

03-Feb-2020

5.085%

$10.5085

04-May-2020

6.780%

$10.6780

03-Aug-2020

8.475%

$10.8475

02-Nov-2020

10.170%

$11.0170

*Observation dates are subject to the market disruption event provisions set forth in the accompanying product supplement.

Payment at Maturity

(per Security)

If the Securities have not been called and the final price of the Underlying Asset is equal to or greater than the trigger price, we will pay you an amount in cash at maturity equal to your principal amount.

If the Securities have not been called and the final price of the Underlying Asset is below the trigger price, we will pay you an amount in cash that is significantly less than the principal amount, if anything, resulting in a loss of principal that is proportionate to the decline of the Underlying Asset, for an amount equal to $10 + ($10 x underlying return).

Underlying Return

Final Price – Initial Price

Initial Price

Closing Price

On any trading day, the last reported sale price (or, in the case of NASDAQ, the official closing price) of the Underlying Asset during the principal trading session on the principal national securities exchange on which it is listed for trading, as determined by the calculation agent.

Initial Price

The closing price of the Underlying Asset on the trade date, as determined by the calculation agent and as may be adjusted in the case of certain corporate events, as described in the accompanying product supplement.

Trigger Price

80.00% of the initial price of the underlying asset, as determined by the calculation agent and as may be adjusted in the case of certain corporate events, as described in the accompanying product supplement.

Final Price

The closing price of the Underlying Asset on the final valuation date, as determined by the calculation agent and subject to adjustments in the case of certain corporate events, as described in the accompanying product supplement.

Trade Date

May 2, 2019

Settlement Date

May 6, 2019

Final Valuation Date

November 2, 2020. The final valuation date may be subject to postponement in the event of a market disruption event, as described in the accompanying product supplement.

Maturity Date

November 5, 2020. The maturity date may be subject to postponement in the event of a market disruption event, as described in the accompanying product supplement.

Call Settlement Dates

Three business days following each observation date, except that the call settlement date for the final valuation date is the maturity date.

CUSIP

[]

ISIN

[]

Valoren

[]

Offering of Securities

Issue Price to Public

Underwriting Discount

Proceeds to UBS AG

Total

Per Security

Total

Per Security

Total

Per Security

Securities linked to the shares of The SPDR® S&P® Regional Banking ETF

$

100%

$

1.35%

$

98.65%

UBS Financial Services Inc.

UBS Investment Bank

Additional Information About UBS and the Securities

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Prospectus supplement dated November 1, 2018:

http://www.sec.gov/Archives/edgar/data/1114446/000091412118002130/ub46175275-424b2.htm

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Market-Linked Securities product supplement dated October 31, 2018:

http://www.sec.gov/Archives/edgar/data/1114446/000091412118002085/ub47016353-424b2.htm

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Prospectus dated October 31, 2018:

http://www.sec.gov/Archives/edgar/data/1114446/000119312518314003/d612032d424b3.htm

Key Risks

An investment in the Securities involves significant risks. Some of the risks that apply to the Securities are summarized here and are comparable to the corresponding risks discussed in the “Key Risks” section of the prospectus supplement, but we urge you to read the more detailed explanation of risks relating to the Securities generally in the ‘‘Risk Factors’’ section of the accompanying product supplement. We also urge you to consult your investment, legal, tax, accounting and other advisors before you invest in the Securities.

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Risk of loss at maturity - The Securities differ from ordinary debt securities in that UBS will not make periodic interest payments or necessarily pay the full principal amount of the Securities at maturity. If the Securities are not called, UBS will repay you the principal amount of your Securities in cash only if the final price of the underlying asset is equal to or greater than the trigger price and will only make such payment at maturity. If the Securities are not called and the final price is less than the trigger price, you will be fully exposed to the negative underlying return and you will lose a significant portion or all of your initial investment in an amount proportionate to the decline in the price of the Underlying Asset.

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Higher call return rates are generally associated with a greater risk of loss - Greater expected volatility with respect to the Underlying Asset reflects a higher expectation as of the trade date that the price of the Underlying Asset could close below its trigger price on the final valuation date of the Securities. This greater expected risk will generally be reflected in a higher call return rate for the Securities. However, the Underlying Asset’s volatility can change significantly over the term of the Securities and the price of the Underlying Asset could fall sharply, which could result in a significant loss of principal.

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The contingent repayment of your 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 then-current underlying asset price is equal to or greater than the trigger price at that time.

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Your potential return on the Securities is limited to the call return - The return potential of the Securities is limited to the call return regardless of the appreciation of the Underlying Asset. In addition, because the call return increases the longer the Securities have been outstanding, the call price payable on earlier observation dates is less than the call price payable on later observation dates. The earlier the Securities are called, the lower your return will be. If the Securities are not called, you will not receive any call return. As an investor in the Securities, you will not participate in any appreciation in the price of the Underlying Asset even though you will be subject to the risk of a decline in the price of the Underlying Asset.

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Greater expected volatility generally indicates an increased risk of loss at maturity - “Volatility” refers to the frequency and magnitude of changes in the price of the underlying asset. The greater the expected volatility of the underlying asset as of the trade date, the greater the expectation is as of the trade date that the final price of the underlying asset could be less than the trigger price and, as a consequence, indicates an increased risk of loss. However, the underlying asset’s volatility can change significantly over the term of the Securities, and a relatively lower trigger price may not necessarily indicate that the Securities have a greater likelihood of a return of principal at maturity. You should be willing to accept the downside market risk of the underlying asset and the potential to lose a significant portion or all of your initial investment.

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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 investment.

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

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Reinvestment risk - If your Securities are called early, the term of the Securities will be reduced and you will not receive any payment on the Securities after the applicable call settlement date. There is no guarantee that you would be able to reinvest the proceeds from an automatic call of the Securities at a comparable rate of return for a similar level of risk. To the extent you are able to reinvest such proceeds in an investment comparable to the Securities, you may incur transaction costs such as dealer discounts and hedging costs built into the price of the new securities. Because the Securities may be called as early as the first observation date after issuance, you should be prepared in the event the Securities are called early.

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Market risk - The price of the Underlying Asset can rise or fall sharply due to factors specific to that Underlying Asset and (i) in the case of common stock or American depositary receipts, its issuer (the "Underlying Asset issuer") or (ii) in the case of an exchange traded fund, the securities, futures contracts or physical commodities constituting the assets of that Underlying Asset. These factors include 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 market volatility and levels, interest rates and economic and political conditions. You, as an investor in the Securities, should make your own investigation into the Underlying Asset issuer and the Underlying Asset for your Securities. We urge you to review financial and other information filed periodically by the Underlying Asset issuer with the SEC.

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Fair value considerations.

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The issue price you pay for the Securities will exceed their estimated initial value - The issue price you pay for the Securities will exceed their estimated initial value as of the trade date due to the inclusion in the issue price of the underwriting discount, hedging costs, issuance costs and projected profits. As of the close of the relevant markets on the trade date, we will determine the estimated initial value of the Securities by reference to our internal pricing models and it will be set forth in the final terms supplement. The pricing models used to determine the estimated initial value of the Securities incorporate certain variables, including the price, volatility and expected dividends on the Underlying Asset, prevailing interest rates, the term of the Securities and our internal funding rate. Our internal funding rate is typically lower than the rate we would pay to issue conventional fixed or floating rate debt securities of a similar term. The underwriting discount, hedging costs, issuance costs, projected profits and the difference in rates will reduce the economic value of the Securities to you. Due to these factors, the estimated initial value of the Securities as of the trade date will be less than the issue price you pay for the Securities.

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The estimated initial value is a theoretical price; the actual price that you may be able to sell your Securities in any secondary market (if any) at any time after the trade date may differ from the estimated initial value - The value of your Securities at any time will vary based on many factors, including the factors described above and in “- Market risk” above and is impossible to predict. Furthermore, the pricing models that we use are proprietary and rely in part on certain assumptions about future events, which may prove to be incorrect. As a result, after the trade date, if you attempt to sell the Securities in the secondary market, the actual value you would receive may differ, perhaps materially, from the estimated initial value of the Securities determined by reference to our internal pricing models. The estimated initial value of the Securities does not represent a minimum or maximum price at which we or any of our affiliates would be willing to purchase your Securities in any secondary market at any time.

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Our actual profits may be greater or less than the differential between the estimated initial value and the issue price of the Securities as of the trade date - We may determine the economic terms of the Securities, as well as hedge our obligations, at least in part, prior to pricing the Securities on the trade date. In addition, there may be ongoing costs to us to maintain and/or adjust any hedges and such hedges are often imperfect. Therefore, our actual profits (or potentially, losses) in issuing the Securities cannot be determined as of the trade date and any such differential between the estimated initial value and the issue price of the Securities as of the trade date does not reflect our actual profits. Ultimately, our actual profits will be known only at the maturity of the Securities.

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Limited or no secondary market and secondary market price considerations.

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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. There can be no assurance that a secondary market for the Securities will develop. UBS Securities LLC and its affiliates may make a market in each offering of the Securities, although they are not required to do so and may stop making a market at any time. If you are able to sell your Securities prior to maturity, you may have to sell them at a substantial loss. The estimated initial value of the Securities does not represent a minimum or maximum price at which we or any of our affiliates would be willing to purchase your Securities in any secondary market at any time.

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The price at which UBS Securities LLC and its affiliates may offer to buy the Securities in the secondary market (if any) may be greater than UBS’ valuation of the Securities at that time, greater than any other secondary market prices provided by unaffiliated dealers (if any) and, depending on your broker, greater than the valuation provided on your customer account statements - For a limited period of time following the issuance of the Securities, UBS Securities LLC or its affiliates may offer to buy or sell such Securities at a price that exceeds (i) our valuation of the Securities at that time based on our internal pricing models, (ii) any secondary market prices provided by unaffiliated dealers (if any) and (iii) depending on your broker, the valuation provided on customer account statements. The price that UBS Securities LLC may initially offer to buy such Securities following issuance will exceed the valuations indicated by our internal pricing models due to the inclusion for a limited period of time of the aggregate value of the underwriting discount, hedging costs, issuance costs and theoretical projected trading profit. The portion of such amounts included in our price will decline to zero on a straight line basis over a period ending no later than the date specified under “Supplemental Plan of Distribution (Conflicts of Interest); Secondary Markets (if any).” Thereafter, if UBS Securities LLC or an affiliate makes secondary markets for the Securities, it will do so at prices that reflect our estimated value determined by reference to our internal pricing models at that time. The temporary positive differential relative to our internal pricing models arises from requests from and arrangements made by UBS Securities LLC with the selling agents of structured debt securities such as the Securities. As described above, UBS Securities LLC and its affiliates are not required to make a market for the Securities and may stop making a market at any time. The price at which UBS Securities LLC or an affiliate may make secondary markets at any time (if at all) will also reflect its then current bid-ask spread for similar sized trades of structured debt securities. UBS Financial Services Inc. and UBS Securities LLC reflect this temporary positive differential on their customer statements. Investors should inquire as to the valuation provided on customer account statements provided by unaffiliated dealers.

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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 Asset; the volatility of the Underlying Asset; the dividend rate paid on the Underlying Asset; the time remaining to the maturity of the Securities; interest rates in the markets; geopolitical conditions and economic, financial, political, force majeure and regulatory or judicial events; the creditworthiness of UBS and the then current bid-ask spread for the Securities.

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Impact of fees and the use of internal funding rates rather than secondary market credit spreads on secondary market prices - All other things being equal, the use of the internal funding rates described above under “- Fair value considerations” as well as the inclusion in the issue price of the underwriting discount, hedging costs, issuance costs and any projected profits are, subject to the temporary mitigating effect of UBS Securities LLC’s and its affiliates’ market making premium, expected to reduce the price at which you may be able to sell the Securities in any secondary market.

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Owning the Securities is not the same as owning the underlying asset - The return on your Securities may not reflect the return you would realize if you actually owned the Underlying Asset. For instance, you will not receive or be entitled to receive any dividend payments or other distributions on the Underlying Asset over the term of your Securities. Furthermore, the Underlying Asset may appreciate substantially during the term of your Securities and you will not participate in such appreciation

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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 Asset will rise or fall. The price of the Underlying Asset will be influenced by complex and interrelated political, economic, financial and other factors that affect the underlying asset issuer. You should be willing to accept the risks of owning equities in general and the Underlying Asset in particular, and to assume the risk that, if the Securities are not automatically called, you will not receive any positive return on your Securities and you may lose a significant portion or all of your initial investment.

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There is no affiliation between the underlying asset issuer, or for Securities linked to exchange traded funds, the issuers of the constituent stocks comprising the underlying asset (the "underlying asset constituent stock issuers"), and UBS is not responsible for any disclosure by such issuer(s) - We and our affiliates may currently, or from time to time in the future engage in business with the underlying asset issuer or, if applicable, any underlying asset constituent stock issuers. However, we are not affiliated with the underlying asset issuer or any underlying asset constituent stock issuers and are not responsible for such issuer's public disclosure of information, whether contained in SEC filings or otherwise. You, as an investor in the Securities, should make your own investigation into the underlying asset issuer or, if applicable, each underlying asset constituent stock issuer. Neither the underlying asset issuer nor any underlying asset constituent stock issuer is involved in the Securities offered hereby in any way and has no obligation of any sort with respect to your Securities. Such issuer(s) have no obligation to take your interests into consideration for any reason, including when taking any corporate actions that might affect the value of, and any amounts payable on, your Securities.

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The calculation agent can make adjustments that affect the payment to you at maturity - For certain corporate events affecting the Underlying Asset, the calculation agent may make adjustments to the initial price, the trigger price and/or the final price of the Underlying Asset. However, the calculation agent will not make an adjustment in response to all events that could affect the Underlying Asset. 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 the accompanying product supplement as necessary to achieve an equitable result. In the case of common stock or American depositary receipts, following certain corporate events relating to the issuer of the Underlying Asset where such issuer is not the surviving entity, the amount of cash you receive at maturity (if any) may be based on the common stock or American depositary receipts of a successor to the Underlying Asset issuer in combination with any cash or any other assets distributed to holders of the Underlying Asset in such corporate event. Additionally, if the issuer of the Underlying Asset becomes subject to (i) a reorganization event whereby the Underlying Asset is exchanged solely for cash, (ii) a merger or consolidation with UBS or any of its affiliates or (iii) an Underlying Asset is delisted or otherwise suspended from trading, the amount you receive at maturity may be based on the common stock or American depository receipts issued by another company. In the case of an exchange traded fund, following a suspension from trading or if an exchange traded fund is discontinued, the amount you receive at maturity may be based on a share of another exchange traded fund. The occurrence of these corporate events and the consequent adjustments may materially and adversely affect the value of the Securities. For more information, see thesections "General Terms of the Securities -- Antidilution Adjustments for Securities Linked to an Underlying Asset or Equity Basket Asset" and " --Reorganization Events for Securities Linked to an Underlying Asset or Equity Basket Asset" in the accompanying product supplement. Regardless of the occurrence of one or more dilution or reorganization events, you should note that at maturity UBS will pay you an amount in cash equal to your principal amount, unless the final price of the underlying asset is below the trigger price (as such trigger price may be adjusted by the calculation agent upon occurrence of one or more such events). Regardless of any of the events discussed above, any payment on the Securities is subject to the creditworthiness of UBS.

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The value of the underlying equity may not completely track the value of the securities in which such exchange traded fund invests –– The underlying equity may be an exchange traded fund, and although the trading characteristics and valuations of such underlying equity will usually mirror the characteristics and valuations of the securities in which such exchange traded fund invests, its value may not completely track the value of such securities. The value of the underlying equity will reflect transaction costs and fees that the securities in which that exchange traded fund invests do not have. In addition, although the underlying equity may be currently listed for trading on an exchange, there is no assurance that an active trading market will continue for such underlying equity or that there will be liquidity in the trading market.

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Fluctuation of NAV –– The net asset value (the "NAV") of an exchange traded fund may fluctuate with changes in the market value of such exchange traded fund’s securities holdings. The market prices of the underlying equity may fluctuate in accordance with changes in NAV and supply and demand on the applicable stock exchanges. In addition, the market price of the underlying equity may differ from its NAV per share; the underlying equity may trade at, above or below its NAV per share.

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Failure of the underlying equity to track the level of the underlying index –– The underlying equity may be an exchange traded fund. Such underlying equity may be designed and intended to track the level of a specific index (an "underlying index"), but various factors, including fees and other transaction costs, may prevent the underlying equity from correlating exactly with changes in the level of such underlying index. Accordingly, the performance of the underlying equity may not be equal to the performance of its underlying index.

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Potential UBS impact on the market price of the Underlying Asset - Trading or transactions by UBS or its affiliates in the Underlying Asset and/or over-the-counter options, futures or other instruments with returns linked to the performance of the Underlying Asset may adversely affect the market price of the Underlying Asset and, therefore, the market value of, and any amounts payable on, your Securities.

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Potential conflict of interest - UBS and its affiliates may engage in business with the issuer of the Underlying Asset, which may present a conflict between the obligations of UBS and you, as a holder of the Securities. The calculation agent, an affiliate of UBS, will determine whether the final price is below the trigger price and accordingly the payment at maturity on your Securities. The calculation agent may also postpone the determination of the closing price of the Underlying Asset if a market disruption event occurs and is continuing on any observation date (including the final valuation date) and may make adjustments to the initial price, trigger price, the final price and/or the Underlying Asset itself for certain corporate events affecting the Underlying Asset. For more information, see thesections "General Terms of the Securities -- Antidilution Adjustments for Securities Linked to an Underlying Asset or Equity Basket Asset" and " -- Reorganization Events for Securities Linked to an Underlying Asset or Equity Basket Asset" in the accompanying product supplement. As UBS determines the economic terms of the Securities, including the call return rate and trigger price, and such terms include the underwriting discount, hedging costs, issuance costs and projected profits, the Securities represent a package of economic terms. There are other potential conflicts of interest insofar as an investor could potentially get better economic terms if that investor entered into exchange-traded and/or OTC derivatives or other instruments with third parties, assuming that such instruments were available and the investor had the ability to assemble and enter into such instruments.

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Potentially inconsistent research, opinions or recommendations by UBS - UBS and its affiliates may publish research or express opinions or provide recommendations that are inconsistent with purchasing or holding the Securities, and which may be revised without notice. Any research, opinions or recommendations expressed by UBS or its affiliates may not be consistent with each other and may influence the value of the Securities. Investors should make their own independent investigation of the merits of investing in the Securities and the Underlying Asset to which the Securities are linked.

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The Securities are not bank deposits- An investment in the Securities carries risks which are very different from the risk profile of a bank deposit placed with UBS or its affiliates. The Securities have different yield and/or return, liquidity and risk profiles and would not benefit from any protection provided to deposits.

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If UBS experiences financial difficulties, FINMA has the power to open restructuring or liquidation proceedings in respect of, and/or impose protective measures in relation to, UBS, which proceedings or measures may have a material adverse effect on the terms and market value of the Securities and/or the ability of UBS to make payments thereunder - The Swiss Financial Market Supervisory Authority (“FINMA”) has broad statutory powers to take measures and actions in relation to UBS if (i) it concludes that there is justified concern that UBS is over-indebted or has serious liquidity problems or (ii) UBS fails to fulfil the applicable capital adequacy requirements (whether on a standalone or consolidated basis) after expiry of a deadline set by FINMA. If one of these pre-requisites is met, FINMA is authorized to open restructuring proceedings or liquidation (bankruptcy) proceedings in respect of, and/or impose protective measures in relation to, UBS. The Swiss Banking Act grants significant discretion to FINMA in connection with the aforementioned proceedings and measures. In particular, a broad variety of protective measures may be imposed by FINMA, including a bank moratorium or a maturity postponement, which measures may be ordered by FINMA either on a stand-alone basis or in connection with restructuring or liquidation proceedings. The resolution regime of the Swiss Banking Act is further detailed in the FINMA Banking Insolvency Ordinance (“BIO-FINMA”). In a restructuring proceeding, FINMA, as resolution authority, is competent to approve the resolution plan. The resolution plan may, among other things, provide for (a) the transfer of all or a portion of UBS’s assets, debts, other liabilities and contracts (which may or may not include the contractual relationship between UBS and the holders of Securities) to another entity, (b) a stay (for a maximum of two business days) on the termination of contracts to which UBS is a party, and/or the exercise of (w) rights to terminate, (x) netting rights, (y) rights to enforce or dispose of collateral or (z) rights to transfer claims, liabilities or collateral under contracts to which UBS is a party, (c) the conversion of UBS’s debt and/or other obligations, including its obligations under the Securities, into equity (a “debt-to-equity” swap), and/or (d) the partial or full write-off of obligations owed by UBS (a “write-off”), including its obligations under the Securities. The BIO-FINMA provides that a debt-to-equity swap and/or a write-off of debt and other obligations (including the Securities) may only take place after (i) all debt instruments issued by UBS qualifying as additional tier 1 capital or tier 2 capital have been converted into equity or written-off, as applicable, and (ii) the existing equity of UBS has been fully cancelled. While the BIO-FINMA does not expressly address the order in which a write-off of debt instruments other than debt instruments qualifying as additional tier 1 capital or tier 2 capital should occur, it states that debt-to-equity swaps should occur in the following order: first, all subordinated claims not qualifying as regulatory capital; second, all other claims not excluded by law from a debt-to-equity swap (other than deposits); and third, deposits (in excess of the amount privileged by law). However, given the broad discretion granted to FINMA as the resolution authority, any restructuring plan in respect of UBS could provide that the claims under or in connection with the Securities will be partially or fully converted into equity or written-off, while preserving other obligations of UBS that rank pari passu with, or even junior to, UBS’s obligations under the Securities. Consequently, holders of Securities may lose all of some of their investment in the Securities. In the case of restructuring proceedings with respect to a systemically important Swiss bank (such as UBS), the creditors whose claims are affected by the restructuring plan will not have a right to vote on, reject, or seek the suspension of the restructuring plan. In addition, if a restructuring plan has been approved by FINMA, the rights of a creditor to seek judicial review of the restructuring plan (e.g., on the grounds that the plan would unduly prejudice the rights of holders of Securities or otherwise be in violation of the Swiss Banking Act) are very limited. In particular, a court may not suspend the implementation of the restructuring plan. Furthermore, even if a creditor successfully challenges the restructuring plan, the court can only require the relevant creditor to be compensated ex post and there is currently no guidance as to on what basis such compensation would be calculated or how it would be funded.

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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 will pay total underwriting compensation of 1.35% per Security to any of our affiliates acting as agents or dealers in connection with the distribution of the Securities. Given that UBS Securities LLC and its affiliates temporarily maintain a market making premium, it may have the effect of discouraging UBS Securities LLC and its affiliates from recommending sale of your Securities in the secondary market.

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Uncertain tax treatment - Significant aspects of the tax treatment of the Securities are uncertain. You should read carefully the sections entitled "What are the Tax Consequences of the Securities" herein and in the prospectus supplement and “Material U.S. Federal Income Tax Consequences” in the accompanying product supplement, and consult your tax advisor about your tax situation.

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The KRE Fund utilizes a passive indexing investment approach - The KRE Fund is not managed according to traditional methods of "active" investment management, which involve the buying and selling of securities based on economic, financial and market analysis and investment judgment. Instead, the KRE Fund, utilizing a "passive" or indexing investment approach, attempts to approximate the investment performance of the S&P® Regional Banks Select Industry Index by investing in a portfolio of stocks that generally replicate such index. Therefore, unless a specific stock is removed from that index, the KRE Fund generally would not sell a stock because the stock's issuer was in financial trouble. In addition, the KRE Fund is subject to the risk that the investment strategy of the KRE Fund's investment adviser may not produce the intended results.

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The Securities are subject to risks associated with the banking sector - Securities linked to the SPDR® S&P Regional Banking ETF ("KRE Fund") are subject to risks associated with the banking sector because the KRE Fund seeks to track the performance of the underlying index, which is comprised of the stocks of companies representing the banking sector of the S&P 500® Index. All or substantially all of the equity securities tracked by the KRE Fund are issued by companies whose primary lines of business are directly associated with the banking sector, which means the KRE Fund will be more affected by the performance of the banking sector versus a fund that is more diversified. The performance of bank stocks may be affected by extensive governmental regulation which may limit both the amounts and types of loans and other financial commitments they can make, and the interest rates and fees they can charge and the amount of capital they must maintain. Profitability is largely dependent on the availability and cost of capital funds, and can fluctuate significantly when interest rates change. Credit losses resulting from financial difficulties of borrowers can negatively impact the sector. Banks may also be subject to severe price competition. The regional banking industry is highly competitive and failure to maintain or increase market share may result in lost market share.

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The securities are subject to risks associated with the financial sector - Financial services companies are subject to extensive governmental regulation which may limit both the amounts and types of loans and other financial commitments they can make, the interest rates and fees they can charge, the scope of their activities, the prices they can charge and the amount of capital they must maintain. Profitability is largely dependent on the availability and cost of capital funds, and can fluctuate significantly when interest rates change or due to increased competition. In addition, deterioration of the credit markets generally may cause an adverse impact in a broad range of markets, including U.S. and international credit and interbank money markets generally, thereby affecting a wide range of financial institutions and markets. Certain events in the financial sector may cause an unusually high degree of volatility in the financial markets, both domestic and foreign, and cause certain financial services companies to incur large losses. Securities of financial services companies may experience a dramatic decline in value when such companies experience substantial declines in the valuations of their assets, take action to raise capital (such as the issuance of debt or equity securities), or cease operations. Credit losses resulting from financial difficulties of borrowers and financial losses associated with investment activities can negatively impact the sector. Insurance companies may be subject to severe price competition. Adverse economic, business or political developments affecting real estate could have a major effect on the value of real estate securities (which include real estate investment trusts ("REITs")). Declining real estate values could adversely affect financial institutions engaged in mortgage finance or other lending or investing activities directly or indirectly connected to the value of real estate.

Information about the Underlying Asset

All disclosures regarding the Underlying Asset are derived from publicly available information. UBS has not conducted any independent review or due diligence of any publicly available information with respect to the Underlying Asset. You should make your own investigation into the Underlying Asset.

The Underlying Asset will be registered under the Securities Act of 1933, the Securities Exchange Act of 1934 (as amended, the "Exchange Act") and/or the Investment Company Act of 1940, each as amended. Companies with securities registered with the SEC are required to file financial and other information specified by the SEC periodically. Information filed by the Underlying Asset issuer with the SEC can be reviewed electronically through a website maintained by the SEC. The address of the SEC’s website is http://www.sec.gov. Information filed with the SEC by the Underlying Asset issuer can be located by reference to its SEC file number provided below. In addition, information filed with the SEC can be inspected and copied at the Public Reference Section of the SEC, 100 F Street, N.E., Room 1580, Washington, D.C. 20549. Copies of this material can also be obtained from the Public Reference Section, at prescribed rates.

The SPDR® S&P® Regional Banking ETF

Quarter Begin

Quarter End

Quarterly High

Quarterly Low

Quarterly Close

07/01/2014

09/30/2014

$41.14

$37.61

$37.86

10/01/2014

12/31/2014

$41.18

$36.05

$40.70

01/02/2015

03/31/2015

$41.58

$36.54

$40.83

04/01/2015

06/30/2015

$45.37

$40.78

$44.16

07/01/2015

09/30/2015

$45.03

$38.56

$41.18

10/01/2015

12/31/2015

$45.93

$40.47

$41.92

01/04/2016

03/31/2016

$40.89

$32.89

$37.64

04/01/2016

06/30/2016

$41.98

$35.51

$38.35

07/01/2016

09/30/2016

$43.09

$36.85

$42.27

10/03/2016

12/30/2016

$56.46

$41.71

$55.57

01/03/2017

03/31/2017

$59.36

$52.59

$54.61

04/03/2017

06/30/2017

$55.75

$51.71

$54.95

07/03/2017

09/29/2017

$56.76

$49.59

$56.76

10/02/2017

12/29/2017

$60.35

$54.35

$58.85

01/02/2018

03/29/2018

$65.03

$58.91

$60.39

04/02/2018

06/29/2018

$65.74

$59.21

$61.00

07/02/2018

09/28/2018

$64.28

$59.42

$59.42

10/01/2018

12/31/2018

$60.15

$44.22

$46.79

01/02/2019

03/29/2019

$57.21

$47.38

$51.34

04/01/2019*

05/01/2019*

$56.06

$52.83

$55.12

What are the Tax Consequences of the Securities?

The U.S. federal income tax consequences of your investment in the Securities are uncertain. There are no statutory provisions, regulations, published rulings or judicial decisions addressing the characterization for U.S. federal income tax purposes of securities with terms that are substantially the same as the Securities. Some of these tax consequences are summarized below, but we urge you to read the more detailed discussion in the prospectus supplement under “What are the Tax Consequences of the Securities?” and the accompanying product supplement under “Material U.S. Federal Income Tax Consequences — Securities Treated as Prepaid Derivatives or Prepaid Forwards” and particularly the discussion in respect of the “constructive ownership” rules under Section 1260 of the Code (defined below), and to discuss the tax consequences of your particular situation with your tax advisor. This discussion is based upon the Internal Revenue Code of 1986, as amended (the “Code”), final, temporary and proposed U.S. Treasury Department (the “Treasury”) regulations, rulings and decisions, in each case, as available and in effect as of the date hereof, all of which are subject to change, possibly with retroactive effect. Tax consequences under state, local and non-U.S. laws are not addressed herein. No ruling from the U.S. Internal Revenue Service (the “IRS”) has been sought as to the U.S. federal income tax consequences of your investment in the Securities, and the following discussion is not binding on the IRS.

U.S. Tax Treatment. Pursuant to the terms of the Securities, UBS and you agree, in the absence of a statutory or regulatory change or an administrative determination or judicial ruling to the contrary, to characterize the Securities as pre-paid derivative contracts with respect to the underlying asset. If your Securities are so treated, you should generally recognize capital gain or loss upon the taxable disposition 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. Subject to the constructive ownership rules, discussed below, such gain or loss should generally be long-term capital gain or loss if you have held your Securities for more than one year (otherwise such gain or loss would be short-term capital gain or loss if held for one year or less). The deductibility of capital losses is subject to limitations.

We will not attempt to ascertain whether the underlying asset issuer would be treated as a “passive foreign investment company” (a “PFIC”) within the meaning of Section 1297 of the Code or as a “United States real property holding corporation” (a “USRPHC”) within the meaning of Section 897 of the Code. If the underlying asset issuer were so treated, certain adverse U.S. federal income tax consequences might apply, to a U.S. holder in the case of a PFIC and to a non-U.S. holder in the case of a USRPHC, upon the taxable disposition of a Security. You should refer to information filed with the SEC or the equivalent governmental authority by the underlying asset issuer and consult your tax advisor regarding the possible consequences to you in the event that such entity is or becomes a PFIC or USRPHC.

In the opinion of our counsel, Cadwalader, Wickersham & Taft LLP, based on certain factual representations received from us, 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 as a single contingent payment debt instrument, or pursuant to some other characterization, (including possible treatment as a “constructive ownership transaction” under Section 1260 of the Code), such that the timing and character of your income from the Securities could differ materially and adversely from the treatment described above, as described further under “Material U.S. Federal Income Tax Consequences — Alternative Treatments for Securities Treated as Any Type of Prepaid Derivative or Prepaid Forward” in the accompanying product supplement. Because of this uncertainty, we urge you to consult your tax advisor as to the tax consequences of your investment in the Notes.

Supplemental Plan of Distribution (Conflicts of Interest); Secondary Markets (if any)

We will agree to sell to UBS Securities LLC and UBS Securities LLC will agree to purchase, all of the Securities at the issue price to the public less the underwriting discount indicated on the cover of the final terms supplement, the document that will be filed pursuant to Rule 424(b) containing the final pricing terms of the Securities. UBS Securities LLC will agree to resell all of the Securities to UBS Financial Services Inc. at a discount from the issue price to the public equal to the underwriting discount indicated on the cover of the final terms supplement.

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

UBS Securities LLC and its affiliates may offer to buy or sell the Securities in the secondary market (if any) at prices greater than UBS’ internal valuation - The value of the Securities at any time will vary based on many factors that cannot be predicted. However, the price (not including UBS Securities LLC’s or any affiliate’s customary bid-ask spreads) at which UBS Securities LLC or any affiliate would offer to buy or sell the Securities immediately after the trade date in the secondary market is expected to exceed the estimated initial value of the Securities as determined by reference to our internal pricing models. The amount of the excess will decline to zero on a straight line basis over a period ending no later than 1 month after the trade date, provided that UBS Securities LLC may shorten the period based on various factors, including the magnitude of purchases and other negotiated provisions with selling agents. Notwithstanding the foregoing, UBS Securities LLC and its affiliates are not required to make a market for the Securities and may stop making a market at any time. For more information about secondary market offers and the estimated initial value of the Securities, see “Key Risks - Fair value considerations” and “Key Risks - Limited or no secondary market and secondary market price considerations” in this preliminary terms supplement.

Prohibition of Sales to EEA Retail Investors — The Securities are not intended to be offered, sold or otherwise made available to and should not be offered, sold or otherwise made available to any retail investor in the European Economic Area (“EEA”). For these purposes, a retail investor means a person who is one (or more) of: (i) a retail client as defined in point (11) of Article 4(1) of Directive 2014/65/EU, as amended (“MiFID II”); (ii) a customer within the meaning of Directive 2002/92/EC, as amended, where that customer would not qualify as a professional client as defined in point (10) of Article 4(1) of MiFID II; or (iii) not a qualified investor as defined in Directive 2003/71/EC, as amended. Consequently no key information document required by Regulation (EU) No 1286/2014 (as amended, the “PRIIPs Regulation”) for offering or selling the Securities or otherwise making them available to retail investors in the EEA has been prepared and therefore offering or selling the Securities or otherwise making them available to any retail investor in the EEA may be unlawful under the PRIIPs Regulation.

Indicative Terms

1

Additional Information About UBS and the Securities

3

Key Risks

4

Information About the Underlying Asset

7

The SPDR® S&P® Regional Banking ETF

7

What are the Tax Consequences of the Securities?

9

Supplemental Plan of Distribution (Conflicts of Interest); Secondary Markets (if any)

11

Prospectus Supplement

Investment Description

i

Features

i

Security Offerings

i

Additional Information About UBS and the Securities

ii

Investor Suitability

1

Summary Terms

2

Investment Timeline

2

What are the Tax Consequences of the Securities ?

3

Key Risks

6

Hypothetical Examples and Return Table

11

Information About the Underlying Asset

12

Supplemental Plan of Distribution (Conflicts of Interest); Secondary Markets (if any)

12

Annex A – Form of Final Terms Supplement

A-2

Annex B – UBS Equity Investor - Investment Guide

B-2

Product Supplement

Product Supplement Summary

PS-1

Specific Terms of Each Security Will Be Described in the Applicable Supplements

PS-1

The Securities are Part of a Series

PS-1

Denomination

PS-2

Coupons

PS-2

Early Redemption

PS-3

Payment at Maturity for the Securities

PS-3

Defined Terms Relating to Payment on the Securities

PS-3

Valuation Dates

PS-5

Valuation Periods

PS-6

Payment Dates

PS-6

Closing Level

PS-7

Intraday Level

PS-7

The Tax Consequences of an Investment in the Securities is Uncertain

PS-8

Risk Factors

PS-9

General Terms of the Securities

PS-9

Specific Terms of Each Security Will Be Described in the Applicable Supplements

PS-28

The Securities are Part of a Series

PS-28

Denomination

PS-28

Coupons

PS-29

Early Redemption

PS-29

Payment at Maturity for Securities

PS-30

Defined Terms Relating to Payment on the Securities

PS-30

Valuation Dates

PS-32

Valuation Periods

PS-33

Payment Dates

PS-33

Closing Level

PS-33

Intraday Level

PS-34

Market Disruption Events

PS-35

Discontinuance of or Adjustments to an Underlying Index; Alteration of Method of Calculation

PS-39

Antidilution Adjustments for Securities Linked to an Underlying Equity or Equity Basket Asset

PS-39

Reorganization Events for Securities Linked to an Underlying Equity or Equity Basket Asset

PS-43

Delisting or Suspension of Trading in an Underlying Equity

PS-46

Delisting of ADRs or Termination of ADR Facility

PS-46

Delisting, Discontinuance or Modification of an ETF

PS-47

Redemption Price Upon Optional Tax Redemption

PS-48

Default Amount on Acceleration

PS-48

Default Amount

PS-48

Default Quotation Period

PS-49

Qualified Financial Institutions

PS-49

Manner of Payment and Delivery

PS-49

Regular Record Dates for Coupons

PS-49

Trading Day

PS-49

Business Day

PS-49

Role of Calculation Agent

PS-50

Booking Branch

PS-50

Use of Proceeds and Hedging

PS-51

Material U.S. Federal Income Tax Consequences

PS-52

Certain ERISA Considerations

PS-74

Supplemental Plan of Distribution (Conflict of Interest)

PS-75

Prospectus

Introduction

1

Cautionary Note Regarding Forward-Looking Statements

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

7

UBS

7

Swiss Regulatory Powers

10

Use of Proceeds

11

Description of Debt Securities We May Offer

12

Description of Warrants We May Offer

32

Legal Ownership and Book-Entry Issuance

47

Considerations Relating to Indexed Securities

52

Considerations Relating to Securities Denominated or Payable in or Linked to a Non-U.S. Dollar Currency

55

U.S. Tax Considerations

58

Tax Considerations Under the Laws of Switzerland

69

Benefit Plan Investor Considerations

71

Plan of Distribution

73

Conflicts of Interest

75

Validity of the Securities

76

Experts

76