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The fund invests, under normal market conditions, at least 80% of its net assets in securities and other investments, the interest on which is exempt from federal income tax and personal income tax, if any, of New York. Interest from the fund’s investments may be subject to the federal alternative minimum tax.

MFS may invest 25% or more of the fund’s assets in municipal instruments that finance similar projects, such as those relating to education, healthcare, housing, utilities, water or sewers. Municipal instruments whose interest is exempt from federal and state personal income tax include instruments issued by U.S. territories and possessions (such as Puerto Rico, Guam, and the U.S. Virgin Islands) and their political subdivisions and public corporations. Although MFS seeks to invest the fund’s assets in municipal instruments whose interest is exempt from federal and state personal income tax, MFS may also invest in taxable instruments.

While MFS may use derivatives for any investment purpose, to the extent MFS uses derivatives, MFS expects to use derivatives primarily to increase or decrease exposure to a particular market, segment of the market, or security, to increase or decrease interest rate exposure, or as alternatives to direct investments. Derivatives include futures, forward contracts, options, structured securities, inverse floating rate instruments, and swaps.

MFS uses a bottom-up investment approach to buying and selling investments for the fund. Investments are selected primarily based on fundamental analysis of individual instruments and their issuers in light of issuers’ current financial condition and current market, economic, political, and regulatory conditions. Factors considered may include the instrument’s credit quality, collateral characteristics, and indenture provisions, and the issuer’s management ability, capital structure, leverage, and ability to meet its current obligations. Quantitative models that systematically evaluate the structure of the debt instrument and its features may also be considered.

The fund invests, under normal market conditions, at least 80% of its net assets in securities and other investments, the interest on which is exempt from federal income tax and personal income tax, if any, of New York. This policy may not be changed without shareholder approval. Interest from the fund’s investments may be subject to the federal alternative minimum tax.

Credit Risk: The price of a debt instrument depends, in part, on the credit quality of the issuer, borrower, counterparty, or underlying collateral and can decline in response to changes in the financial condition of the issuer, borrower, counterparty, or underlying collateral, or changes in specific or general market, economic, industry, political, regulatory, geopolitical, or other conditions.

Lower quality debt instruments (commonly referred to as “high yield securities” or “junk bonds”) can involve a substantially greater risk of default or can already be in default, and their values can decline significantly. Lower quality debt instruments are regarded as having predominantly speculative characteristics. Lower quality debt instruments tend to be more sensitive to adverse news about the issuer, or the market or economy in general, than higher quality debt instruments.

Geographic Focus Risk: The fund’s performance will be closely tied to the economic and political conditions in New York, and can be more volatile than the performance of a more geographically diversified fund. In addition, the fund's performance can also be tied to the economic and political conditions of U.S. territories and possessions. These conditions may include constitutional or statutory limits on an issuer’s ability to raise revenues or increase taxes, anticipated or actual budget deficits or other financial difficulties, or changes in the credit quality of municipal issuers in the state or in U.S. territories and possessions.

Municipal Risk: The price of a municipal instrument can be volatile and significantly affected by adverse tax or court rulings, legislative or political changes, changes in specific or general market and economic conditions, and the financial condition of municipal issuers and insurers. Because many municipal instruments are issued to finance similar projects, conditions in these industries can significantly affect the fund and the overall municipal market.

The yield and share price of the fund will change daily based on changes in interest rates and market, economic, industry, political, regulatory, geopolitical, and other conditions. As with any mutual fund, the fund may not achieve its objective and/or you could lose money on your investment in the fund. An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

Interest Rate Risk: The price of a debt instrument changes in response to interest rate changes. In general, the price of a debt instrument falls when interest rates rise and rises when interest rates fall. Instruments with longer maturities, or that do not pay current interest, are more sensitive to interest rate changes. In addition, short-term and long-term interest rates do not necessarily move in the same direction or by the same amount. An instrument’s reaction to interest rate changes depends on the timing of its interest and principal payments and the current interest rate for each of those time periods. Instruments with floating interest rates can be less sensitive to interest rate changes.

Credit Risk: The price of a debt instrument depends, in part, on the issuer’s or borrower’s credit quality or ability to pay principal and interest when due. The price of a debt instrument is likely to fall if an issuer or borrower defaults on its obligation to pay principal or interest or if the instrument’s credit rating is downgraded by a credit rating agency. The price of a debt instrument can also decline in response to changes in the financial condition of the issuer or borrower, changes in specific market, economic, industry, political, regulatory, geopolitical, and other conditions that affect a particular type of instrument, issuer, or borrower, and changes in general market, economic, political, regulatory, geopolitical, and other conditions. Certain unanticipated events, such as natural disasters, terrorist attacks, war, and other geopolitical events can have a dramatic adverse effect on the price of a debt instrument. For certain types of instruments, including derivatives, the price of the instrument depends in part on the credit quality of the counterparty to the transaction. For other types of debt instruments, including collateralized instruments, the price of the debt instrument also depends on the credit quality and adequacy of the underlying assets or collateral. Enforcing rights against the underlying assets or collateral may be difficult, or the underlying assets or collateral may be insufficient, if the issuer defaults.

Municipal instruments supported as to the payment of principal and interest only by the revenue from a specific project or specific assets, or by the issuer’s pledge to make annual appropriations for lease payments, are subject to greater credit risk due to the possibility that taxation supporting the project or assets will be discontinued, revenues for the project or from the assets will be insufficient, or annual appropriations for lease payments will not be made.

Lower quality debt instruments can involve a substantially greater risk of default or can already be in default, and their values can decline significantly over short periods of time. Lower quality debt instruments are regarded as having predominantly speculative characteristics with respect to capacity to pay interest and principal. Lower quality debt instruments tend to be more sensitive to adverse news about the issuer, or the market or economy in general, than higher quality debt instruments. The market for lower quality debt instruments can be less liquid, especially during periods of recession or general market decline.

MFS New York Municipal Bond Fund

Geographic Focus Risk: The fund’s performance will be closely tied to issuer, market, economic, industry, political, regulatory, and geopolitical conditions in New York, and can be more volatile than the performance of a more geographically diversified fund. In addition, the fund's performance can also be tied to these conditions in U.S. territories and possessions. These conditions may include constitutional or statutory limits on an issuer’s ability to raise revenues or increase taxes, anticipated or actual budget deficits or other financial difficulties, or changes in the credit quality of municipal issuers in New York or the U.S. territories and possessions. New York City in particular has experienced financial problems, as have certain localities outside New York City; continuation of these problems could affect the overall fiscal health of New York State. In addition, financial market declines pose a particularly large degree of uncertainty for New York due to the importance of the finance industry to the State’s economy. Furthermore, New York State, though its broad economic base generally supports such use, has relied on bond financing to a more extensive degree than almost any other State in the nation. The economy of Puerto Rico is closely tied to the United States economy and is dominated by the manufacturing and servicing sectors. The economy of Guam is heavily dependent on tourism and the U.S. military. The economy of the U.S. Virgin Islands is heavily dependent on tourism.

Prepayment/Extension Risk: Many types of debt instruments, including mortgage-backed securities, asset-backed securities, certain corporate bonds and certain derivatives, and municipal housing bonds, are subject to the risk of prepayment and/or extension. Prepayment occurs when unscheduled payments of principal are made or the instrument is called or redeemed prior to an instrument’s maturity. When interest rates decline, the instrument is called, or for other reasons, these debt instruments may be repaid more quickly than expected. As a result, the holder of the debt instrument may not be able to reinvest the proceeds at the same interest rate or on the same terms, reducing the potential for gain. When interest rates increase or for other reasons, these debt instruments may be repaid more slowly than expected. As a result, the maturity of the debt instrument is extended, increasing the potential for loss. In addition, prepayment rates are difficult to predict and the potential impact of prepayment on the price of a debt instrument depends on the terms of the instrument.

Municipal Risk: The price of a municipal instrument can be volatile and significantly affected by adverse tax or court rulings, legislative or political changes, market and economic conditions, issuer, industry-specific and other conditions. If the Internal Revenue Service or a state taxing authority determines that an issuer of a municipal instrument has not complied with applicable tax requirements, interest from the instrument could become taxable (including retroactively) and the instrument could decline significantly in price. Because many municipal instruments are issued to finance similar projects, especially those relating to education, health care, housing, utilities, and water and sewer, conditions in these industries can significantly affect the fund and the overall municipal market. In addition, changes in the financial condition of an individual municipal insurer can affect the overall municipal market.

Derivatives Risk: Derivatives can be highly volatile and involve risks in addition to the risks of the underlying indicator(s). Gains or losses from derivatives can be substantially greater than the derivatives’ original cost and can sometimes be unlimited. Derivatives can involve leverage. Derivatives can be complex instruments and can involve analysis and processing that differs from that required for other investment types used by the fund. If the value of a derivative does not correlate well with the particular market or other asset class the derivative is intended to provide exposure to, the derivative may not have the effect anticipated. Derivatives can also reduce the opportunity for gains or result in losses by offsetting positive returns in other investments. Derivatives can be less liquid than other types of investments.

Leveraging Risk: Certain transactions and investment strategies can result in leverage. Leverage involves investment exposure in an amount exceeding the initial investment. In transactions involving leverage, a relatively small change in an underlying indicator can lead to significantly larger losses to the fund. Leverage can cause increased volatility by magnifying gains or losses.

Counterparty and Third Party Risk: Transactions involving a counterparty other than the issuer of the instrument, or a third party responsible for servicing the instrument or effecting the transaction, are subject to the credit risk of the counterparty or third party, and to the counterparty’s or third party’s ability to perform in accordance with the terms of the transaction.

Liquidity Risk: Certain investments and types of investments are subject to restrictions on resale, may trade in the over-the-counter market or in limited volume, or may not have an active trading market. In addition, at times all or a large portion of segments of the market may not have an active trading market. As a result, it may not be possible to sell a particular investment or type of investment at any particular time or at an acceptable price.