497K 1 fsmb_497k.htm SUMMARY PROSPECTUS

Rule 497(k)

File No. 333-176976

First Trust
Exchange-Traded Fund III

SUMMARY PROSPECTUS
First Trust Short Duration Managed Municipal ETF
Ticker Symbol: FSMB
Exchange: NYSE Arca
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 statutory prospectus and other information about the Fund, including the statement of additional information and most recent reports to shareholders, online at www.ftportfolios.com/retail/ETF/ETFfundnews.aspx?Ticker=FSMB.  You can also get this information at no cost by calling (800) 621-1675 or by sending an e-mail request to info@ftportfolios.com.  The Fund’s  prospectus and statement of additional information, both dated November 1, 2018, are all incorporated by reference into this Summary Prospectus.
November 2, 2018

Investment Objective
The First Trust Short Duration Managed Municipal ETF (the "Fund") seeks to provide federally tax-exempt income consistent with capital preservation.
Fees and Expenses of the Fund
The following table describes the fees and expenses you may pay if you buy and hold shares of the Fund. Investors purchasing and selling shares may be subject to costs (including customary brokerage commissions) charged by their broker, which are not reflected in the table below.
Shareholder Fees
(fees paid directly from your investment)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) None
    
Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)
Management Fees 0.55%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses(1) 0.00%
Total Annual Fund Operating Expenses 0.55%
Fee Waiver(2) 0.10%
Total Annual Fund Operating Expenses After Fee Waiver 0.45%
(1) "Other Expenses" is an estimate based on the expenses the Fund expects to incur for the current fiscal year.
(2) Pursuant to a contractual agreement, First Trust Advisors L.P., the Fund's investment advisor, has agreed to waive management fees of 0.10% of average daily net assets until November 1, 2020. This waiver agreement may be terminated by action of the Trust's Board of Trustees at any time upon 60 days' written notice by the Trust, on behalf of the Fund, or by the Fund's investment advisor only after November 1, 2020.
Example
The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account customary brokerage commissions that you pay when purchasing or selling shares of the Fund in the secondary market.
The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain at current levels. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
1 Year 3 Years
$46 $156
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 transaction costs and may result in higher taxes when Fund 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.
Principal Investment Strategies
Under normal market conditions, the Fund seeks to achieve its investment objective by investing at least 80% of its net assets (including investment borrowings) in municipal debt securities that pay interest that is exempt from regular federal income taxes (collectively, “Municipal Securities”). Municipal Securities are generally issued by or on behalf of states, territories or possessions of the U.S. and the District of Columbia and their political subdivisions, agencies, authorities and other instrumentalities. The Fund’s investment advisor seeks to construct a portfolio that has a weighted average duration of 13 years. Duration is a mathematical calculation of the average life of a debt security (or portfolio of debt securities) that serves as a measure of its price risk. In general, each year of duration represents an expected 1% change in the value of a security for every 1% immediate change in interest rates. For example, if a portfolio of mortgage loans has an average duration of three years, its value can be expected to fall about 3% if interest rates rise by 1%. Conversely, the portfolio’s value can be expected to rise about 3% if interest rates fall by 1%. As a result, prices of instruments with shorter durations tend to be less sensitive to interest rate changes than instruments with longer durations. As the value of a security changes over time, so will its duration. The Fund’s investment advisor will calculate the duration of the portfolio by modeling the cash flows of all the individual holdings, including the impact of prepayment variability and coupon adjustments where applicable, to determine the duration

of each holding and then aggregating based on the size of the position. In performing this duration calculation, the Fund’s investment advisor will utilize third-party models.
In selecting the Fund’s portfolio, the portfolio managers will focus on Municipal Securities that meet basic infrastructure needs or provide critical services within their communities. The Fund will invest in Municipal Securities issued throughout the United States, including in Municipal Securities issued by entities in at least 10 different states, with an emphasis on states with growing populations and healthy employment trends.
Under normal market conditions, the Fund will primarily invest in Municipal Securities that are, at the time of investment, rated as investment grade (i.e., rated Baa3/BBB- or above) by at least one nationally recognized statistical rating organization rating such securities or, if unrated, Municipal Securities determined by the Fund’s investment advisor to be of comparable quality. The Fund may invest up to 35% of its net assets in Municipal Securities rated below investment grade by at least one nationally recognized statistical rating organization rating such securities (or Municipal Securities that are unrated and determined by the Fund’s investment advisor to be of comparable quality), commonly referred to as “high yield” or “junk” bonds.
The types of Municipal Securities in which the Fund may invest include municipal lease obligations (and certificates of participation in such obligations), municipal general obligation bonds, municipal revenue bonds, municipal notes, municipal cash equivalents, alternative minimum tax bonds, private activity bonds (including without limitation industrial development bonds), securities issued by custodial receipt trusts and pre-refunded and escrowed to maturity bonds. Alternative minimum tax bonds and private activity bonds may be subject to the federal alternative minimum tax.
The Fund may also purchase new issues of Municipal Securities on a when-issued or forward commitment basis. The Municipal Securities in which the Fund invests may be fixed, variable or floating-rate securities.
The Fund is classified as “non-diversified” under the Investment Company Act of 1940 (the “1940 Act”).
Principal Risks
You could lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. There can be no assurance that the Fund’s investment objectives will be achieved.
ALTERNATIVE MINIMUM TAX RISK. The Fund has no limit as to the amount that can be invested in alternative minimum tax bonds. Therefore, all or a portion of the Fund’s otherwise exempt-interest dividends may be taxable to those shareholders subject to the federal alternative minimum tax.
AUTHORIZED PARTICIPANT CONCENTRATION RISK. Only an authorized participant (as defined in the “Frequent Purchases and Redemptions” Section) 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 the Fund’s net asset value and possibly face delisting.
CALL RISK. If an issuer calls higher-yielding debt instruments held by the Fund, performance could be adversely impacted. During periods of falling interest rates, issuers of callable securities may call (redeem) securities with higher coupon rates or interest rates before their maturity dates. The Fund would then lose any price appreciation above the bond’s call price and would be forced to reinvest the unanticipated proceeds at lower interest rates, resulting in a decline in the Fund’s income. Such redemptions and subsequent reinvestments would also increase the Fund’s portfolio turnover rate.
CASH TRANSACTIONS RISK. The Fund will, under most circumstances, effect a portion of creations and redemptions for cash, rather than in-kind securities. As a result, an investment in the Fund may be less tax-efficient than an investment in an exchange-traded fund ("ETF") that effects its creations and redemptions for in-kind securities. Because the Fund may effect a portion of redemptions for cash, it may be required to sell portfolio securities in order to obtain the cash needed to distribute redemption proceeds. A sale of shares may result in capital gains or losses and may also result in higher brokerage costs.
CREDIT RISK. Credit risk is the risk that an issuer of a security held by the Fund will be unable or unwilling to make dividend, interest and/or principal payments when due and the related risk that the value of such security may decline because of concerns about the issuer’s ability to make such payments. Credit risk may be heightened if the Fund invests in "high yield" or "junk" securities; such securities, while generally offering higher yields than investment grade debt with similar maturities, involve greater risks, including the possibility of dividend or interest deferral, default or bankruptcy, and are regarded as predominantly speculative with respect to the issuer’s capacity to pay dividends or interest and repay principal.
CREDIT SPREAD RISK. Credit spread risk is the risk that credit spreads (i.e., the difference in yield between securities that have differences in credit quality or other factors) may increase, which may reduce the market values of the Fund’s securities. While the Fund may employ strategies to mitigate credit spread risk, these strategies may not be successful.

CUSTODIAL RECEIPT TRUSTS RISK. Custodial receipts are financial instruments that represent the right to receive future principal and interest payments on underlying municipal obligations. Custodial receipt trusts may issue inverse floater securities and if the Fund were to hold inverse floaters issued by custodial receipt trusts, the Fund would be subject to the risks of inverse floaters described herein. In particular, because the instruments may be leveraged, their market values may be more volatile than other types of fixed income securities.
CYBER SECURITY RISK. As the use of Internet technology has become more prevalent in the course of business, the Fund has become more susceptible to potential operational risks through breaches in cyber security. A breach in cyber security refers to both intentional and unintentional events that may cause the Fund to lose proprietary information, suffer data corruption or lose operational capacity. Such events could cause the Fund to incur regulatory penalties, reputational damage, additional compliance costs associated with corrective measures and/or financial loss. Cyber security breaches may involve unauthorized access to the Fund’s digital information systems through “hacking” or malicious software coding, but may also result from outside attacks such as denial-of-service attacks through efforts to make network services unavailable to intended users. In addition, cyber security breaches of the Fund’s third party service providers, such as its administrator, transfer agent, custodian, or sub-advisor, as applicable, or issuers in which the Fund invests, can also subject the Fund to many of the same risks associated with direct cyber security breaches. The Fund has established risk management systems designed to reduce the risks associated with cyber security. However, there is no guarantee that such efforts will succeed, especially because the Fund does not directly control the cyber security systems of issuers or third party service providers.
EXTENSION RISK. Extension risk is the risk that, when interest rates rise, certain obligations will be paid off by the issuer (or obligor) more slowly than anticipated, causing the value of these securities to fall. Rising interest rates tend to extend the duration of securities, making them more sensitive to changes in interest rates. The value of longer-term securities generally changes more in response to changes in interest rates than shorter-term securities. As a result, in a period of rising interest rates, securities may exhibit additional volatility and may lose value.
FLUCTUATION OF NET ASSET VALUE RISK. The net asset value of shares of the Fund will generally fluctuate with changes in the market value of the Fund’s holdings. The market prices of shares will generally fluctuate in accordance with changes in net asset value as well as the relative supply of and demand for shares on the Exchange. The Fund’s investment advisor cannot predict whether shares will trade below, at or above their net asset value because the shares trade on the Exchange at market prices and not at net asset value. Price differences may be due, in large part, to the fact that supply and demand forces at work in the secondary trading market for shares will be closely related to, but not identical to, the same forces influencing the prices of the holdings of the Fund trading individually or in the aggregate at any point in time. However, given that shares can only be purchased and redeemed either in-kind or for cash in Creation Units, and only to and from broker-dealers and large institutional investors that have entered into participation agreements (unlike shares of closed-end funds, which frequently trade at appreciable discounts from, and sometimes at premiums to, their net asset value), the Fund’s investment advisor believes that large discounts or premiums to the net asset value of shares should not be sustained.
HIGH YIELD SECURITIES RISK. High yield securities, or “junk” bonds, are subject to greater market fluctuations and risk of loss than securities with higher ratings, and therefore, are considered to be highly speculative. These securities are issued by issuers that may have narrowly focused operations and/or other impediments to the timely payment of periodic interest and principal at maturity. If the economy slows down or dips into recession, the issuers of high yield securities may not have sufficient resources to continue making timely payment of periodic interest and principal at maturity. The market for high yield securities is smaller and less liquid than that for investment grade securities. High yield securities are generally not listed on a national securities exchange but trade in the over-the-counter markets. Due to the smaller, less liquid market for high yield securities, the bid-offer spread on such securities is generally greater than it is for investment grade securities and the purchase or sale of such securities may take longer to complete. In general, high yield securities may have a greater risk of default than other types of securities.
INCOME RISK. Income from the Fund’s fixed income investments could decline during periods of falling interest rates.
INDUSTRIAL DEVELOPMENT BOND RISK. These revenue bonds are issued by or on behalf of public authorities to obtain funds to finance various public and/or privately operated facilities, including those for business and manufacturing, housing, sports, pollution control, airport, mass transit, port and parking facilities. To the extent that the industrial development sector continues to represent a significant portion of the Fund, the Fund will be sensitive to changes in, and its performance may depend to a greater extent on, the overall condition of the industrial development sector. These bonds are normally secured only by the revenues from the project and not by state or local government tax payments. Consequently, the credit quality of these securities is dependent upon the ability of the user of the facilities financed by the bonds and any guarantor to meet its financial obligations. Payment of interest on and repayment of principal on such bonds are the responsibility of the user and/or any guarantor. These bonds are subject to a wide variety of risks, many of which relate to the nature of the specific project. Generally, the value and credit quality of these bonds are sensitive to the risks related to an economic slowdown.
INFLATION RISK. Inflation risk is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Fund’s assets can decline as can the value of the Fund’s distributions.
INTEREST RATE RISK. Interest rate risk is the risk that the value of the debt securities in the Fund’s portfolio will decline because of rising market interest rates. Interest rate risk is generally lower for shorter term debt securities and higher for longer term debt securities.

Duration is a measure of the expected price volatility of a debt security as a result of changes in market rates of interest, based on, among other factors, the weighted average timing of the debt security’s expected principal and interest payments. In general, duration represents the expected percentage change in the value of a security for an immediate 1% change in interest rates. For example, the price of a security with a three-year duration would be expected to drop by approximately 3% in response to a 1% increase in interest rates. Therefore, prices of debt securities with shorter durations tend to be less sensitive to interest rate changes than debt securities with longer durations. As the value of a debt security changes over time, so will its duration.
INVERSE FLOATERS RISK. The Fund may use inverse floaters, which creates effective leverage. Due to the leveraged nature of these investments, the value of an inverse floater will increase and decrease to a significantly greater extent than the values of the custodial receipt trust’s underlying municipal bonds in response to changes in market interest rates or credit quality. An investment in inverse floaters typically will involve greater risk than an investment in a fixed rate municipal bond.
Distributions on inverse floaters bear an inverse relationship to short-term municipal bond interest rates. Thus, distributions paid to the Fund on its inverse floaters will be reduced or even eliminated as short-term municipal interest rates rise and will increase when short-term municipal interest rates fall. The greater the amount of floaters sold by a custodial receipt trust relative to the inverse floaters (i.e., the greater the effective leverage of the inverse floaters), the more volatile the distributions on the inverse floaters will be. Inverse floaters generally will underperform the market for fixed rate municipal bonds in a rising interest rate environment.
MANAGEMENT RISK. The Fund is subject to management risk because it is an actively managed portfolio. In managing the Fund’s investment portfolio, the Fund’s investment advisor will apply investment techniques and risk analyses that may not have the desired result. There can be no guarantee that the Fund will meet its investment objectives.
MARKET MAKER RISK. If the Fund has lower average daily trading volumes, it may rely on a small number of third-party market makers to provide a market for the purchase and sale of shares. Any trading halt or other problem relating to the trading activity of these market makers could result in a dramatic change in the spread between the Fund’s net asset value and the price at which the Fund’s shares are trading on the Exchange, which could result in a decrease in the value of the Fund’s shares. In addition, decisions by market makers or authorized participants to reduce their role or step away from these activities in times of market stress could inhibit the effectiveness of the arbitrage process in maintaining the relationship between the underlying values of the Fund’s portfolio securities and the Fund’s market price. This reduced effectiveness could result in Fund shares trading at a discount to net asset value and also in greater than normal intraday bid-ask spreads for Fund shares.
MARKET RISK. Market risk is the risk that a particular security owned by the Fund or shares of the Fund in general may fall in value. Securities are subject to market fluctuations caused by such factors as economic, political, regulatory or market developments, changes in interest rates and perceived trends in bond prices. Also, certain of these factors may affect the liquidity of the bonds in the Fund’s portfolio and make it more difficult for the Fund to sell them. Shares of the Fund could decline in value or underperform other investments.
MUNICIPAL LEASE OBLIGATIONS RISK. Participation interests in municipal leases pose special risks because many leases and contracts contain “non-appropriation” clauses that provide that the governmental issuer has no obligation to make future payments under the lease or contract unless money is appropriated for this purpose by the appropriate legislative body.
MUNICIPAL SECURITIES MARKET LIQUIDITY RISK. Inventories of Municipal Securities held by brokers and dealers have decreased in recent years, lessening their ability to make a market in these securities. This reduction in market making capacity has the potential to decrease the Fund’s ability to buy or sell Municipal Securities, and increase price volatility and trading costs, particularly during periods of economic or market stress. As a result, the Fund may be forced to accept a lower price to sell a Municipal Security, to sell other securities to raise cash, or to give up an investment opportunity, any of which could have a negative effect on performance.
NEW FUND RISK. The Fund currently has fewer assets than larger funds, and like other new funds, large inflows and outflows may impact the Fund’s market exposure for limited periods of time. This impact may be positive or negative, depending on the direction of market movement during the period affected. Also, during the initial invest-up period, the Fund may depart from its principal investment strategies and invest a larger amount or all of its assets in cash equivalents or it may hold cash.
NON-DIVERSIFICATION RISK. The Fund is classified as “non-diversified” under the 1940 Act. As a result, the Fund is only limited as to the percentage of its assets which may be invested in the securities of any one issuer by the diversification requirements imposed by the Internal Revenue Code of 1986, as amended. The Fund may invest a relatively high percentage of its assets in a limited number of issuers. As a result, the Fund may be more susceptible to a single adverse economic or regulatory occurrence affecting one or more of these issuers, experience increased volatility and be highly invested in certain issuers.
POLITICAL AND ECONOMIC RISK. The values of Municipal Securities held by the Fund may be adversely affected by local political and economic conditions and developments. Adverse conditions in an industry significant to a local economy could have a correspondingly adverse effect on the financial condition of local issuers.
PRE-REFUNDED BONDS RISK. Pre-refunded bonds are bonds that have been refunded to a call date prior to the final maturity of principal, or, in the case of pre-refunded bonds commonly referred to as “escrowed-to-maturity bonds,” to the final maturity of principal, and remain outstanding in the municipal market. The payment of principal and interest of the pre-refunded bonds held by the Fund

is funded from securities held in a designated escrow account where such securities are obligations of and carry the full faith and credit of the U.S. Treasury. The securities held in the escrow fund pledged to pay the principal and interest of the pre-refunded bond do not guarantee the price of the bond. Investment in pre-refunded municipal bonds held by the Fund may subject the Fund to interest rate risk, market risk and credit risk. In addition, while a secondary market exists for pre-refunded municipal bonds, if the Fund sells pre-refunded municipal bonds prior to maturity, the price received may be more or less than the original cost, depending on market conditions at the time of sale.
PRIVATE ACTIVITY BONDS RISK. Municipalities and other public authorities issue private activity bonds to finance development of industrial facilities for use by a private enterprise. The private enterprise pays the principal and interest on the bond and the issuing authority ordinarily does not pledge its full faith, credit and taxing power for repayment. The private enterprise can have a substantially different credit profile than the municipality or public authority. The private activity bonds in which the Fund may invest may be negatively impacted by conditions affecting either the general credit of the user of the private activity project or the project itself. The Fund’s private activity bond holdings also may pay interest subject to the alternative minimum tax.
TAX RISK. Interest income from Municipal Securities is normally not subject to regular federal income tax, but income from Municipal Securities held by the Fund could be declared taxable because of, among other things, unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service or state tax authorities or noncompliant conduct of a bond issuer. Consequently, the attractiveness of Municipal Securities in relation to other investment alternatives is affected by changes in federal income tax rates or changes in the tax-exempt status of interest income from Municipal Securities.
TRADING ISSUES RISK. Although the shares of the Fund are listed for trading on the Exchange, there can be no assurance that an active trading market for such shares will develop or be maintained. Trading in shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in shares inadvisable. In addition, trading in shares on the Exchange is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. Market makers are under no obligation to make a market in the Fund’s shares, and authorized participants are not obligated to submit purchase or redemption orders for Creation Units. In the event market makers cease making a market in the Fund's shares or authorized participants stop submitting purchase or redemption orders for Creation Units, Fund shares may trade at a larger premium or discount to their net asset value. There can be no assurance that the requirements of the Exchange necessary to maintain the listing of the Fund will continue to be met or will remain unchanged. The Fund may have difficulty maintaining its listing on the Exchange in the event the Fund’s assets are small or the Fund does not have enough shareholders.
VALUATION RISK. Unlike publicly traded securities that trade on national exchanges, there is no central place or exchange for fixed income securities trading. Fixed income securities generally trade on an “over-the-counter” market which may be anywhere in the world where the buyer and seller can settle on a price. Due to the lack of centralized information and trading, the valuation of fixed income securities may carry more uncertainty and risk than that of publicly traded securities. Accordingly, determinations of the fair value of fixed income securities may be based on infrequent and dated information. Also, because the available information is less reliable and more subjective, elements of judgment may play a greater role in valuation of debt securities than for other types of securities. Typically, fixed income securities are valued using information provided by a third-party pricing service, which primarily uses broker quotes to value the securities.
ZERO COUPON BONDS RISK. Zero coupon bonds do not pay interest on a current basis and may be highly volatile as interest rates rise or fall. In addition, while such bonds generate income for purposes of generally accepted accounting standards, they do not generate cash flow and thus could cause the Fund to be forced to liquidate securities at an inopportune time in order to distribute cash, as required by tax laws.
Performance
The Fund does not have a performance history. Once available, the Fund’s performance information, and information that gives some indication of the risks of an investment in the Fund by comparing the Fund’s performance with a broad measure of market performance, will be available on the Fund’s website at www.ftportfolios.com. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Management
Investment Advisor
First Trust Advisors L.P. (“First Trust” or the “Advisor”)
Portfolio Managers
The following persons serve as portfolio managers of the Fund.
Tom Futrell, CFA, Senior Vice President, Senior Portfolio Manager of First Trust
Johnathan N. Wilhelm, Senior Vice President, Senior Portfolio Manager of First Trust
The portfolio managers are primarily and jointly responsible for the day-to-day management of the Fund. Each portfolio manager has managed the Fund since 2018.

Purchase and Sale of Fund Shares
The Fund issues and redeems shares on a continuous basis, at net asset value, only in Creation Units consisting of 50,000 shares. The Fund’s Creation Units are generally issued and redeemed for cash and, in certain circumstances, in-kind for securities in which the Fund invests, and only to and from broker-dealers and large institutional investors that have entered into participation agreements. Individual shares of the Fund may only be purchased and sold on NYSE Arca and other eligible securities exchanges through a broker-dealer. Shares of the Fund will trade on NYSE Arca at market prices rather than net asset value, which may cause the shares to trade at a price greater than net asset value (premium) or less than net asset value (discount).
Tax Information
The Fund intends to make interest income distributions, some of which will be exempt from regular federal income tax. All or a portion of these distributions, however, may be subject to the federal alternative minimum tax and state and local taxes, and may have other tax consequences (e.g., they may affect the amount of your social security benefits that are taxed). The Fund may make other distributions that are subject to federal income tax.
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), First Trust and First Trust Portfolios L.P., the Fund’s distributor, may pay the intermediary for the sale of Fund shares and related services. 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.
You can find the Fund’s statutory prospectus and other information about the Fund, including the statement of additional information and most recent reports to shareholders, online at www.ftportfolios.com/retail/ETF/ETFfundnews.aspx?Ticker=FSMB.
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