Summary Prospectus February 5, 2019

NASDAQ (Ticker Symbol): WINC

WESTERN ASSET

SHORT DURATION INCOME ETF

Before you invest, you may want to review the fund’s Prospectus, which contains more information about the fund and its risks. You can find the fund’s Prospectus and other information about the fund, including the fund’s statement of additional information and shareholder reports, online at www.leggmason.com/etfliterature. You can also get this information at no cost by calling the fund at 1-877-721-1926 or 1-203-703-6002 or by sending an e-mail request to prospectus@leggmason.com, or from your financial intermediary. The fund’s Prospectus and statement of additional information, each dated February 5, 2019 (as may be amended or supplemented from time to time), are incorporated by reference into this Summary Prospectus.

Beginning in January 2021, as permitted by regulations adopted by the Securities and Exchange Commission, the Fund intends to no longer mail paper copies of the Fund’s shareholder reports, unless you specifically request paper copies of the reports from your financial intermediary (such as a broker-dealer or bank). Instead, the reports will be made available on a website, and you will be notified by mail each time a report is posted and provided with a website link to access the report.

If you already elected to receive shareholder reports electronically (“e-delivery”), you will not be affected by this change and you need not take any action. If you have not already elected e-delivery, you may elect to receive shareholder reports and other communications from the Fund electronically by contacting your financial intermediary.

You may elect to receive all future reports in paper free of charge by contacting your financial intermediary to request that you continue to receive paper copies of your shareholder reports. Your election to receive reports in paper will apply to all Legg Mason Funds held in your account with your financial intermediary.

INVESTMENT PRODUCTS: NOT FDIC INSURED • NO BANK GUARANTEE • MAY LOSE VALUE

Investment objective

Western Asset Short Duration Income ETF (the “fund”) seeks current income.

Fees and expenses of the fund

The accompanying table describes the fees and expenses that you may pay if you buy and hold shares of the fund. You may also incur usual and customary brokerage commissions and other charges when buying or selling shares of the fund, which are not reflected in the table. The management agreement between Legg Mason ETF Investment Trust (the “Trust”) and Legg Mason Partners Fund Advisor, LLC (“LMPFA” or the “manager”) (the “Management Agreement”) provides that LMPFA will pay all operating expenses of the fund, except interest expenses, taxes, brokerage expenses, future Rule 12b-1 fees (if any), acquired fund fees and expenses, extraordinary expenses and the management fee payable to LMPFA under the Management Agreement.

Shareholder fees
(fees paid directly from your investment)
	None
Annual fund operating expenses(%)
(expenses that you pay each year as a percentage of the value of your investment)
Management fees	0.29
Distribution and/or service (12b-1) fees	0.00
Other expenses1	None
Total annual fund operating expenses	0.29

¹  “Other expenses” are estimated for the current fiscal year. Actual expenses may differ from estimates.

Example:

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example assumes:

● You invest $10,000 in the fund for the time periods indicated

● Your investment has a 5% return each year and the fund’s operating expenses remain the same

You may also incur usual and customary brokerage commissions and other charges when buying or selling shares of the fund, which are not reflected in the example.

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Number of years you own shares ($)
	1 year	3 years
Western Asset Short Duration Income ETF	30	94

Portfolio turnover. The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher

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transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. The fund is newly offered; therefore, it does not have a turnover rate to report for the most recent fiscal year.

Principal investment strategies

Under normal market conditions, the fund invests at least 80% of its net assets, plus borrowings for investment purposes, in “investment grade” fixed income securities. Corporate debt securities, including notes, bonds, debentures and commercial paper, are fixed income securities usually issued by businesses to finance their operations. These securities may be secured or unsecured, may be issued by U.S. or foreign entities and may carry variable or floating rates of interest. The fund may invest in Rule 144A securities. The fund may also invest in other short-duration fixed-income securities, such as floating rate loans and structured debt and in cash or cash equivalents such as money market securities. Securities in which the fund will invest will be U.S. dollar-denominated although they may be issued by a foreign corporation or a U.S. affiliate of a foreign corporation, or a foreign government or its agencies and instrumentalities.

Although the fund may invest in securities of any maturity, the fund will normally maintain an effective duration, as estimated by the subadviser, of three years or less. Effective duration seeks to measure the expected sensitivity of market price to changes in interest rates, taking into account the anticipated effects of structural complexities (for example, some bonds can be prepaid by the issuer).

Investment grade securities are those rated by a rating agency at the time of purchase in one of the top four ratings categories (e.g., BBB- or higher by S&P Global Ratings (“S&P”) or Baa3 or higher by Moody’s Investors Service, Inc. (“Moody’s”)) or, if unrated, are judged by the subadviser to be of comparable credit quality. The fund may also invest up to 15% of its assets in fixed income securities that are below investment grade (e.g., BB+ or lower by S&P or Ba1 or lower by Moody’s). Below investment grade securities are commonly known as “junk bonds” or “high yield securities.”

The fund may also invest up to 15% of its assets in mortgage-backed securities (“MBS”) and asset-backed securities (“ABS”), including collateralized debt obligations (“CDOs”).

The fund may use derivatives, from time to time, in order to change the investment characteristics of its portfolio (such as shortening or lengthening duration) and/or for other purposes.

Principal risks

Risk is inherent in all investing. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly. You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or by any bank or government agency. The following is an alphabetical list of the principal risks of investing in the fund.

Asset class risk. Securities or other assets in the fund’s portfolio may underperform in comparison to the general financial markets, a particular financial market or other asset classes.

Assets under management (AUM) risk. From time to time a third party, LMPFA and/or affiliates of LMPFA or a fund may invest in the fund and hold its investment for a specific period of time in

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order to facilitate commencement of the fund’s operations or to allow for the fund to achieve size or scale. There can be no assurance that any such entity would not redeem its investment or that the size of the fund would be maintained at such levels.

Asset-backed and mortgage-backed securities risk. MBS and ABS are subject to credit, interest rate, prepayment and extension risks. These securities also are subject to risk of default on the underlying mortgage or asset, particularly during periods of economic downturn. When market interest rates increase, the market values of MBS decline. At the same time, however, mortgage refinancings and prepayments slow, which lengthens the effective duration of these securities. As a result, the negative effect of the interest rate increase on the market value of MBS is usually more pronounced than it is for other types of fixed income securities, potentially increasing the volatility of the fund. Conversely, when market interest rates decline, while the value of MBS may increase, the rate of prepayment of the underlying mortgages also tends to increase, which shortens the effective duration of these securities. MBS are also subject to the risk that underlying borrowers will be unable to meet their obligations and the value of property that secures the mortgage may decline in value and be insufficient, upon foreclosure, to repay the associated loan. Investments in ABS are subject to similar risks. Payment of principal and interest on ABS is dependent largely on the cash flows generated by the assets backing the securities. The risk of loss due to default on private MBS and ABS is historically higher because neither the U.S. government nor an agency or instrumentality has guaranteed them. MBS and ABS are subject to heightened liquidity risk and the liquidity of MBS and ABS may change over time.

Authorized Participant concentration risk. Only an Authorized Participant may engage in creation or redemption transactions directly with the fund. The fund has a limited number of institutions that act as Authorized Participants. To the extent that these institutions exit the business or are unable to proceed with creation and/or redemption orders with respect to the fund and no other Authorized Participant is able to step forward to create or redeem, in either of these cases, fund shares may trade at a discount to net asset value (“NAV”) and possibly face trading halts and/or delisting.

Cash transactions risk. Unlike most other ETFs, the fund may effect its creations and redemptions primarily for cash, rather than in-kind securities. Paying redemption proceeds in cash rather than through in-kind delivery of portfolio securities may require the fund to dispose of or sell portfolio investments to obtain the cash needed to distribute redemption proceeds at an inopportune time. This may cause the fund to incur certain costs such as brokerage costs, and to recognize gains or losses that it might not have incurred if it had made a redemption in-kind. As a result, the fund may pay out higher or lower annual capital gains distributions than ETFs that redeem in-kind. As a practical matter, only institutions and large investors, such as market makers or other large broker-dealers, purchase or redeem Creation Units. Most investors will buy and sell shares of the fund on an exchange.

Credit risk. If an issuer or guarantor of a security held by the fund or a counterparty to a financial contract with the fund defaults or is downgraded, or is perceived to be less creditworthy, or if the value of the assets underlying a security declines, the value of your investment will typically decline. Subordinated securities are more likely to suffer a credit loss than non-subordinated securities of the same issuer and will be disproportionately affected by a default, downgrade or perceived decline in creditworthiness.

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Cybersecurity risk. Cybersecurity incidents may allow an unauthorized party to gain access to fund assets, customer data (including private shareholder information), or proprietary information, or cause the fund, the manager, the subadviser, Authorized Participants, the relevant listing exchange and/or their service providers (including, but not limited to, fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) to suffer data breaches, data corruption or lose operational functionality.

Extension risk. When interest rates rise, repayments of fixed income securities, particularly ABS and MBS, may occur more slowly than anticipated, extending the effective duration of these fixed income securities at below market interest rates and causing their market prices to decline more than they would have declined due to the rise in interest rates alone. This may cause the fund’s share price to be more volatile.

Foreign investments and emerging market risk. The fund’s investments in securities of foreign issuers or issuers with significant exposure to foreign markets involve additional risk. Foreign countries in which the fund may invest may have markets that are less liquid, less regulated and more volatile than U.S. markets. The value of the fund’s investments may decline because of factors affecting the particular issuer as well as foreign markets and issuers generally, such as unfavorable or unsuccessful government actions, reduction of government or central bank support and political or financial instability. Lack of information may also affect the value of these securities. To the extent the fund focuses its investments in a single country or only a few countries in a particular geographic region, economic, political, regulatory or other conditions affecting such country or region may have a greater impact on fund performance relative to a more geographically diversified fund.

The risks of foreign investments are heightened when investing in issuers in emerging market countries. Emerging market countries tend to have economic, political and legal systems that are less fully developed and are less stable than those of more developed countries. Less developed markets are more likely to experience problems with the clearing and settling of trades and the holding of securities by banks, agents and depositories that are less developed than those in the United States. They are often particularly sensitive to market movements because their market prices tend to reflect speculative expectations. Low trading volumes may result in a lack of liquidity and in extreme price volatility.

Hedging risk. There can be no assurance that the fund will engage in hedging transactions at any given time, even under volatile market conditions, or that any hedging transactions the fund engages in will be successful. Hedging transactions involve costs and may reduce gains or result in losses.

High yield (“junk”) bonds risk. High yield bonds are generally subject to greater credit risks than higher-grade bonds, including the risk of default on the payment of interest or principal. High yield bonds are considered speculative, tend to be less liquid and are more difficult to value than higher grade securities. High yield bonds tend to be volatile and more susceptible to adverse events, credit downgrades and negative sentiments and may be difficult to sell at a desired price, or at all, during periods of uncertainty or market turmoil.

Investment in loans risk. The primary risk in an investment in loans is that borrowers may be unable to meet their interest and/or principal payment obligations. Transactions in loans may settle on a delayed basis. As a result, the proceeds from the sale of a loan may not be available to make additional investments or to meet the fund’s redemption obligations.

Western Asset Short Duration Income ETF 5

Leveraging risk. The value of your investment may be more volatile if the fund borrows or uses derivatives or other investments that have a leveraging effect on the fund’s portfolio. Other risks also will be compounded. This is because leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the fund would otherwise have had. The fund may also have to sell assets at inopportune times to satisfy its obligations. The use of leverage is considered to be a speculative investment practice and may result in the loss of a substantial amount, and possibly all, of the fund’s assets.

Liquidity risk. Some assets held by the fund may be impossible or difficult to sell, particularly during times of market turmoil. These illiquid assets may also be difficult to value. Markets may become illiquid when, for instance, there are few, if any, interested buyers or sellers or when dealers are unwilling or unable to make a market for certain securities. As a general matter, dealers recently have been less willing to make markets for fixed income securities. If the fund is forced to sell an illiquid asset to meet redemption requests or other cash needs, the fund may be forced to sell at a loss. The liquidity of certain assets, particularly of privately-issued and non-investment grade MBS, ABS and CDOs, may be difficult to ascertain and may change over time.

Market and interest rate risk. The market prices of the fund’s securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic or political conditions, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. When market prices fall, the value of your investment will go down. The value of your investment will generally go down when interest rates rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. Interest rates have been historically low, so the fund faces a heightened risk that interest rates may rise. A general rise in interest rates may cause investors to move out of fixed income securities on a large scale, which could adversely affect the price and liquidity of fixed income securities and could also result in increased redemptions from the fund.

Market events risk. In the past decade financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. Governmental and non-governmental issuers have defaulted on, or been forced to restructure, their debts. These conditions may continue, recur, worsen or spread. Events that have contributed to these market conditions include, but are not limited to, major cybersecurity events; geopolitical events (including wars and terror attacks); measures to address budget deficits; downgrading of sovereign debt; changes in oil and commodity prices; dramatic changes in currency exchange rates; and public sentiment.

U.S. and non-U.S. governments and central banks have provided significant support to financial markets, including by keeping interest rates at historically low levels. The U.S. Federal Reserve is reducing its market support activities and has begun raising interest rates. Certain non-U.S. governments and central banks have implemented or may implement so-called negative rates (e.g., charging depositors who keep their cash at a bank) to spur economic growth. Further Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, could negatively affect financial markets generally, increase market volatility and reduce the value and liquidity of securities in which the fund invests.

6 Western Asset Short Duration Income ETF

Policy and legislative changes in the United States and in other countries and other events affecting global markets, such as the United Kingdom’s expected exit from the European Union (or Brexit) are affecting many aspects of financial regulation and may in some instances contribute to decreased liquidity and increased volatility in the financial markets. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time.

Economies and financial markets throughout the world are increasingly interconnected. Economic, financial or political events, trading and tariff arrangements, terrorism, natural disasters and other circumstances in one country or region could have profound impacts on global economies or markets. As a result, whether or not the fund invests in securities of issuers located in or with significant exposure to the countries directly affected, the value and liquidity of the fund’s investments may be negatively affected.

Market trading risk. The fund faces numerous market trading risks, including the potential lack of an active market for fund shares, losses from trading in secondary markets, periods of high volatility and disruptions in the creation/redemption process.

Absence of active market. Although shares of the fund are listed for trading on one or more stock exchanges, there can be no assurance that an active trading market for such shares will develop or be maintained by market makers or Authorized Participants. Authorized Participants are not obligated to execute purchase or redemption orders for Creation Units. In periods of market volatility, market makers and/or Authorized Participants may be less willing to transact in fund shares. The absence of an active market for the fund’s shares may contribute to the fund’s shares trading at a premium or discount to NAV.

Shares of the fund may trade at prices other than NAV. Shares of the fund trade on stock exchanges at prices at, above or below the fund’s most recent NAV. The NAV of the fund is calculated at the end of each business day and fluctuates with changes in the market value of the fund’s holdings. The trading price of the fund’s shares fluctuates continuously throughout trading hours based on both market supply of and demand for fund shares and the underlying value of the fund’s portfolio holdings or NAV. As a result, the trading prices of the fund’s shares may deviate significantly from NAV during periods of market volatility, including during periods of significant redemption requests or other unusual market conditions.

ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND’S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

National closed market trading risk. Where the underlying securities held by the fund trade on foreign exchanges that are closed when the securities exchange on which the fund’s shares trade is open, there are likely to be deviations between the current price of such an underlying security (i.e., during the ETF’s domestic trading day) and the last quoted price for the underlying security (i.e., the fund’s quote from the closed foreign market), which in turn could lead to a difference between the price at which the fund has valued the security and the value of the underlying security. This could also result in premiums or discounts to the fund’s NAV that may be greater than those experienced by other ETFs.

Portfolio management risk. The value of your investment may decrease if the subadviser’s judgment about the attractiveness or value of, or market trends affecting a particular security,

Western Asset Short Duration Income ETF 7

industry, sector or region, or about market movements is incorrect, or if there are imperfections, errors or limitations in the tools and data used by the subadviser. In addition, the fund’s investment strategies or policies may change from time to time. Those changes may not lead to the results intended by the subadviser and could have an adverse effect on the value or performance of the fund. Furthermore, the implementation of the fund’s investment strategies is subject to a number of constraints, which could also adversely affect the fund’s value or performance.

Prepayment or call risk. Many issuers have a right to prepay their securities. If interest rates fall, an issuer may exercise this right. If this happens, the fund will not benefit from the rise in market price that normally accompanies a decline in interest rates, and will be forced to reinvest prepayment proceeds at a time when yields on securities available in the market are lower than the yield on the prepaid security. The fund also may lose any premium it paid on the security.

Rule 144A securities risk. Rule 144A securities are restricted securities that can be purchased only by “qualified institutional buyers,” as defined under the Securities Act of 1933, as amended. The market for Rule 144A securities typically is less active than the market for publicly-traded securities. As such, investing in Rule 144A securities may reduce the liquidity of the fund’s investments, and the fund may be unable to sell the security at the desired time or price, if at all. The purchase price and subsequent valuation of Rule 144A securities normally reflect a discount, which may be significant, from the market price of comparable unrestricted securities for which a liquid trading market exists. A restricted security that was liquid at the time of purchase may subsequently become illiquid and its value may decline as a result. In addition, transaction costs may be higher for restricted securities than for more liquid securities. The fund may also have to bear the expense of registering the securities for resale and the risk of substantial delays in effecting the registration.

Trading issues risk. Trading in shares on NASDAQ may be halted in certain circumstances. There can be no assurance that the requirements of NASDAQ necessary to maintain the listing of the fund will continue to be met.

U.S. government securities risk. Although the U.S. government guarantees principal and interest payments on securities issued by the U.S. government and some of its agencies, such as securities issued by the Government National Mortgage Association (“Ginnie Mae”), this guarantee does not apply to losses resulting from declines in the market value of these securities.

Valuation risk. The sales price the fund could receive for any particular portfolio investment may differ from the fund’s valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair value methodology. Authorized Participants who purchase or redeem fund shares on days when the fund is holding fair-valued securities may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the fund had not fair-valued securities or had used a different valuation methodology. The fund’s ability to value its investments may be impacted by technological issues and/or errors by pricing services or other third party service providers.

These and other risks are discussed in more detail in the Prospectus or in the Statement of Additional Information (“SAI”).

8 Western Asset Short Duration Income ETF

Performance

The fund has not yet operated for a full calendar year. Once the fund has a performance record of at least one calendar year, a bar chart and performance table will be included in this Prospectus. The performance information will provide some indication of the risks of investing in the fund by showing changes in the fund’s performance from year to year and by showing how the fund’s average annual returns compare with those of a broad measure of market performance.

The fund will make updated performance information, including its current net asset value, available at www.leggmason.com/etfproducts (select fund), or by calling the fund at 1-877-721-1926.

Management

Investment manager: Legg Mason Partners Fund Advisor, LLC (“LMPFA” or the “manager”)

Subadviser: Western Asset Management Company, LLC (“Western Asset”)

Sub-subadviser: Western Asset Management Company Limited in London (“Western Asset London”), Western Asset Management Company Pte. Ltd. in Singapore (“Western Asset Singapore”) and Western Asset Management Company Ltd in Japan (“Western Asset Japan”). References to “the subadviser” include the subadviser and each applicable sub-subadviser.

Portfolio managers: S. Kenneth Leech (Chief Investment Officer), Michael C. Buchanan (Deputy Chief Investment Officer), Ryan K. Brist (Head of Global Investment Grade Credit and Portfolio Manager), Blanton Y. Keh (Portfolio Manager) and Kurt D. Halvorson (Portfolio Manager). Each of Mr. Leech, Mr. Buchanan, Mr. Brist, Mr. Keh and Mr. Halvorson has been part of the portfolio management team for the fund since February 2019. These investment professionals, all of whom are employed by Western Asset, work together with a broader investment management team.

Purchase and sale of fund shares

The fund is an actively managed exchange-traded fund (commonly referred to as an “ETF”). Individual shares of the fund are listed on a national securities exchange and are redeemable only by Authorized Participants in Creation Units (as defined in this section). Most investors will buy and sell shares of the fund through a broker-dealer. The price of fund shares is based on market price, and because ETF shares trade at market prices rather than at NAV, shares may trade at a price greater than NAV (a premium) or less than NAV (a discount). The fund will only issue or redeem shares that have been aggregated into blocks of 100,000 shares or multiples thereof (“Creation Units”) to Authorized Participants who have entered into agreements with the fund’s distributor. The fund will issue or redeem Creation Units in return for a designated portfolio of securities and/or cash that the fund specifies each day.

Tax information

The fund’s distributions are taxable, and will be taxed as ordinary income and/or capital gains, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account. Withdrawals from such tax-deferred arrangements may be subject to tax at a later date.

Western Asset Short Duration Income ETF 9

Payments to broker-dealers and other financial intermediaries

If you purchase shares of the fund through a broker-dealer or other financial intermediary (such as a bank), LMPFA or other related companies may pay the intermediary for marketing activities and presentations, educational training programs, conferences, the development of technology platforms and reporting systems or other services related to the sale or promotion of the fund. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the fund over another investment. Ask your salesperson or visit your financial intermediary’s website for more information.

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ETFF493896SP 02/19