The fund's shares will change in value and you could lose money by investing in the fund. The fund is subject to management risk because it is an actively managed portfolio. In managing the fund's investment portfolio, the advisor will apply investment techniques and risk analyses that may not have the desired result. There can be no assurance that the fund's investment objectives will be achieved.

The fund is subject to 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. The values of municipal securities held by the fund may be adversely affected by local political and economic conditions and developments.

Municipal bonds are subject to numerous additional risks, including credit risk, credit spread risk, income risk, inflation risk, interest rate risk, extension risk, call risk, zero coupon bond risk, valuation risk, and political and economic risk. Credit risk is the risk that an issuer of a security will be unable or unwilling to make dividend, interest and/or principal payments when due and that the value of a security may decline as a result. Credit spread risk is the risk that credit spreads may increase, which may reduce the market values of the fund's securities. Income risk is the risk that income from the fund's fixed income investments could decline during periods of falling interest rates. 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. Interest rate risk is the risk that the value of the securities in the fund will decline because of rising market interest rates. 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. Call risk is the risk that performance could be adversely impacted if an issuer calls higher-yielding debt instruments held by the fund. Zero coupon bond risk is the risk that zero coupon bonds may be highly volatile as interest rates rise or fall because they do not pay interest on a current basis. Valuation risk is the risk that, 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. Political and economic risk is the risk that 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.

Income from municipal bonds 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. The fund has no limit as to the amount that can be invested in alternative minimum tax bonds. 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.

Inventories of municipal securities have decreased in recent years, lessening the 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.

Custodial receipt trusts may issue inverse floater securities in which the fund may invest. Inverse floater securities may be leveraged and their market values may be more volatile than other types of fixed-income instruments. In addition, 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 as short-term municipal interest rates fall.

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. Such events could cause the fund to incur regulatory penalties, reputational damage, additional compliance costs associated with corrective measures and/or financial loss.

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.

The fund is subject to industrial development bond risk which is the risk that 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.

The payment of principal and interest of a pre-refunded bond 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 do not guarantee the price of the bond.

Private activity bonds, issued by municipalities or other public authorities, can have a substantially different credit profile than the municipality or public authority and may be negatively impacted by conditions affecting either the general credit of the use of the private activity project or the project itself.

The fund may invest in distressed municipal securities and many distressed securities are illiquid or trade in low volumes and thus may be more difficult to value.

High-yield securities, or "junk" bonds, are subject to greater market fluctuations and risk of loss than securities with higher ratings, and therefore, may be highly speculative. These securities are issued by companies that may have limited operating history, narrowly focused operations, and/or other impediments to the 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.

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.

The fund will, under most circumstances, effect a portion of creations and redemptions for cash, rather than in-kind securities. As a result, the fund may be less tax-efficient.

The fund currently has fewer assets than larger funds, and like other relatively new funds, large inflows and outflows may impact the fund's market exposure for limited periods of time.

The fund is classified as "non-diversified" and 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 concentrated in certain issuers.

First Trust Advisors L.P. is the adviser to the fund. First Trust Advisors L.P. is an affiliate of First Trust Portfolios L.P., the fund's distributor.