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, online at funds.mfs.com.  You can also get this information at no cost by calling 1-800-225-2606 or by sending an e-mail request to orderliterature@mfs.com.  The fund’s prospectus and statement of additional information, both dated August 28, 2013, as may be supplemented from time to time, are incorporated by reference into this Summary Prospectus.

 
CLASS
 
TICKER SYMBOL
Class A
MFSAX
Class B
MFSBX
Class C
MFSDX
Class I
MFSIX
Class R1
MFSEX
Class R2
MFSNX
Class R3
MFSOX
Class R4
MFSPX
 
Summary of Key Information
 
Investment Objective
The fund’s investment objective is to seek a high level of total return consistent with its asset allocation until the approximate retirement year in the fund's name; thereafter, the fund will seek total return through a combination of current income and capital appreciation.  The asset allocation of the fund will change over time.
 
Fees and Expenses
This table describes the fees and expenses that you may pay when you buy and hold shares of the fund.
 
You may qualify for sales charge reductions if you and certain members of your family invest, or agree to invest in the future, at least $50,000 in MFS Funds. More information about these and other waivers and reductions is available from your financial intermediary and in “Sales Charges and Waivers or Reductions” on page 12 of the fund’s prospectus and “Waivers of Sales Charges” on page H-1 of the fund’s Statement of Additional Information ("SAI").
 
Shareholder Fees (fees paid directly from your investment):
 
Share Class
A
B
C
I
ALL Rs
Maximum Sales Charge (Load)
Imposed on Purchases
(as a percentage of offering price)
5.75%
None
None
None
None
Maximum Deferred Sales Charge (Load)
(as a percentage of original purchase price or redemption proceeds, whichever is less)
1.00% #
4.00%
1.00%
None
None
 
Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):
 
Share Class
A
B
C
I
R1
R2
R3
R4
Management Fee
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
Distribution and/or Service (12b-1) Fees
0.25%
1.00%
1.00%
None
1.00%
0.50%
0.25%
None
Other Expenses
0.35%
0.35%
0.35%
0.35%
0.35%
0.35%
0.35%
0.35%
Acquired (Underlying) Fund Fees and Expenses
0.64%
0.64%
0.64%
0.64%
0.64%
0.64%
0.64%
0.64%
Total Annual Fund
Operating Expenses
1.24%
1.99%
1.99%
0.99%
1.99%
1.49%
1.24%
0.99%
Fee Reductions and/or Expense Reimbursements 1
(0.35)%
(0.35)%
(0.35)%
(0.35)%
(0.35)%
(0.35)%
(0.35)%
(0.35)%
Total Annual Fund Operating Expenses After Fee Reductions and/or Expense Reimbursements
0.89%
1.64%
1.64%
0.64%
1.64%
1.14%
0.89%
0.64%
 
#
On shares purchased without an initial sales charge and redeemed within 18 months of purchase for shares purchased on or after August 1, 2012, and within 24 months of purchase for shares purchased prior to August 1, 2012.
1
Massachusetts Financial Services Company has agreed in writing to bear the fund's expenses, excluding management fees, distribution and service fees, interest, taxes, extraordinary expenses, brokerage and transaction costs, investment-related expenses, and fees and expenses associated with investments in investment companies and other similar investment vehicles, such that "Other Expenses" do not exceed 0.00% of the fund's average daily net assets annually for each class of shares.  This agreement will continue until at least August 31, 2014, after which Massachusetts Financial Services Company may increase such expense limitation to 0.10% of the fund’s average daily net assets annually for each class of shares without a vote of the fund’s Board of Trustees.  Any increase above 0.10% would require a vote of the fund’s Board of Trustees.

ML1-SUM-022014                                                                                                             Page 1 of 5

 
 

 

MFS Lifetime 2010 Fund
 
Example
This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds.
 
The example assumes that: you invest $10,000 in the fund for the time periods indicated and you redeem your shares at the end of the time periods (unless otherwise indicated); your investment has a 5% return each year; and the fund’s operating expenses remain the same.
 
Although your actual costs will likely be higher or lower, under these assumptions your costs would be:
 
 
1 YEAR
3 YEARS
5 YEARS
10 YEARS
Class A Shares
$661
$913
$1,185
$1,960
Class B Shares assuming
       
    redemption at end of period
$567
$891
$1,240
$2,094
    no redemption at end of period
$167
$591
$1,040
$2,094
Class C Shares assuming
       
    redemption at end of period
$267
$591
$1,040
$2,289
    no redemption at end of period
$167
$591
$1,040
$2,289
Class I Shares
$65
$280
$513
$1,181
Class R1 Shares
$167
$591
$1,040
$2,289
Class R2 Shares
$116
$437
$780
$1,750
Class R3 Shares
$91
$359
$647
$1,469
Class R4 Shares
$65
$280
$513
$1,181

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 shares are held in a taxable account. These transaction costs, which are not reflected in “Annual Fund Operating Expenses” or in the “Example,” affect the fund’s performance.  During the most recent fiscal year, the fund’s portfolio turnover rate was 21% of the average value of its portfolio.
 
Principal Investment Strategies
The fund is designed to provide diversification among different asset classes for investors with the approximate retirement date in the fund's name. The fund invests substantially all of its assets in other MFS mutual funds, referred to as underlying funds. The underlying funds are selected following a two-stage asset allocation process. The first stage is a strategic asset allocation to establish the percentage of the fund's assets to be invested in the general asset classes of Bond Funds, International Stock Funds, and U.S. Stock Funds, as well as an allocation to underlying funds that have less traditional investment strategies that MFS (Massachusetts Financial Services Company, the fund’s investment adviser) believes provide diversification benefits when added to a portfolio consisting of stock and bond funds (referred to as Specialty Funds). The second stage involves the actual selection of underlying funds to represent the asset classes based on underlying fund classifications, historical risk, performance, and other factors. Within the stock fund allocations, MFS seeks to diversify globally (by including domestic and international underlying funds), in terms of market capitalization (by including large, mid, and small capitalization underlying funds) and by style (by including both growth and value underlying funds). Within the bond fund allocation, MFS includes underlying funds with varying degrees of interest rate and credit exposure.
 
As of August 1, 2013, the fund’s target allocation among asset classes and the underlying funds was:
 
Bond Funds:
71%
MFS Emerging Markets Debt Fund
1%
MFS Global Bond Fund
5%
MFS Government Securities Fund
10%
MFS High Income Fund
3%
MFS Inflation-Adjusted Bond Fund
10%
MFS Limited Maturity Fund
20%
MFS Research Bond Fund
22%
International Stock Funds:
5%
MFS International Growth Fund
1%
MFS International Value Fund
1%
MFS Research International Fund
3%
U.S. Stock Funds:
20%
MFS Growth Fund
4%
MFS Mid Cap Growth Fund
3%
MFS Mid Cap Value Fund
3%
MFS New Discovery Fund
1%
MFS New Discovery Value Fund
1%
MFS Research Fund
4%
MFS Value Fund
4%
Specialty Funds:
4%
MFS Absolute Return Fund
2%
MFS Commodity Strategy Fund
1%
MFS Global Real Estate Fund
1%
Due to rounding, the target asset class and underlying fund allocations presented in the table may not total 100%.
 
The asset class allocations, as well as the underlying funds and their target weightings, are based on an allocation strategy designed for investors with the approximate retirement year in the fund’s name. Investors should also consider their age, personal circumstances, risk tolerance, and overall investment strategy and allocation. The asset allocation strategy will become increasingly conservative over time.
Upon reaching its stated target year, the fund’s allocation strategy will be aligned with the allocation strategy of the MFS Lifetime Retirement Income Fund.  It is expected that the fund will be combined with the MFS Lifetime Retirement Income Fund within five years of the date that its asset allocation strategy matches the asset allocation strategy of the MFS Lifetime Retirement Income Fund.  The chart below illustrates how the asset allocation strategy of the fund will change over time.
 

 
Page 2 of 5

 

MFS Lifetime 2010 Fund
 
Principal Risks
As with any mutual fund, the fund may not achieve its objective and/or you could lose money on your investment in the fund, including near or after the target year.  There is no guarantee that the fund will provide income at or through retirement. 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.
 
The principal risks of investing in the fund are:
 
Investment Selection and Allocation Risk:   MFS’ investment analysis, its selection of investments, and its assessment of the risk/return potential of asset classes and underlying funds may not produce the intended results and/or can lead to an investment focus that results in the fund underperforming other funds with similar investment strategies and/or underperforming the markets in which the fund invests.
 
Underlying Funds Risk: MFS' strategy of investing in underlying funds exposes the fund to the risks of the underlying funds. Each underlying fund pursues its own investment objective and strategies and may not achieve its objective.
 
Interest Rate Risk:   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.
 
Credit Risk: The price of a debt instrument depends, in part, on the credit quality of the issuer, borrower, counterparty, or underlying collateral or assets and the terms of the instrument. The price of a debt instrument can decline in response to changes in the financial condition of the issuer, borrower, counterparty, or underlying collateral or assets, or changes in specific or general market, economic, industry, political, regulatory, geopolitical, and 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.
 
Foreign and Emerging Markets Risk: Exposure to foreign markets, especially emerging markets, through issuers or currencies can involve additional risks relating to market, economic, industry, political, regulatory, geopolitical, and other conditions. These factors can make foreign investments, especially those in emerging markets, more volatile and less liquid than U.S. investments. In addition, foreign markets can react differently to these conditions than the U.S. market. Emerging markets can have less developed markets , greater custody and operational risk, less developed legal, regulatory, and accounting systems, and greater political, social, and economic instability than developed markets.
 
Currency Risk: The value of foreign currencies relative to the U.S. dollar fluctuates in response to market, economic, industry, political, regulatory, geopolitical, and other conditions, and a decline in the value of a foreign currency versus the U.S. dollar reduces the value in U.S. dollars of investments denominated in that foreign currency.
 
Prepayment/Extension Risk:   Instruments subject to prepayment and/or extension can reduce the potential for gain for the instrument’s holders if the instrument is prepaid and increase the potential for loss if the maturity of the instrument is extended.
 
Inflation-Adjusted Debt Instruments Risk:   Interest payments on inflation-adjusted debt instruments can be unpredictable and vary based on the level of inflation. If inflation is negative, principal and income can both decline.
 
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.
 
Stock Market/Company Risk:   Stock markets are volatile and can decline significantly in response to issuer, market, economic, industry, political, regulatory, geopolitical, and other conditions, as well as to investor perceptions of these conditions. The price of an equity security can decrease significantly in response to these conditions, and these conditions can affect a single issuer or type of security, issuers within a broad market sector, industry or geographic region, or the market in general.
 
Growth Company Risk: The stocks of growth companies can be more sensitive to the company’s earnings and more volatile than the market in general.
 
Value Company Risk:   The stocks of value companies can continue to be undervalued for long periods of time and not realize their expected value and can be more volatile than the market in general.
 
Real Estate-Related Investment Risk: The risks of investing in real estate-related securities include certain risks associated with the direct ownership of real estate and the real estate industry in general. These include risks related to general, regional and local economic conditions; fluctuations in interest rates and property tax rates; shifts in zoning laws, environmental regulations and other governmental action; cash flow dependency; increased operating expenses; lack of availability of mortgage funds; losses due to natural disasters; overbuilding; losses due to casualty or condemnation; changes in property values and rental rates; and other factors.  The securities of smaller real estate-related issuers can be more volatile and less liquid than securities of larger issuers and their issuers can have more limited financial resources.
 
Commodity Risk:   The value of commodities may be more volatile than the value of equity securities or debt instruments and their value may be affected by changes in overall market movements, commodity index volatility, changes in interest rates, or factors affecting a particular industry or commodity. The price of a commodity may be affected by demand/supply imbalances in the market for the commodity.
 
Derivatives Risk:   Derivatives can be highly volatile and involve risks in addition to the risks of the underlying indicator(s) on which the derivative is based. Gains or losses from derivatives can be substantially greater than the derivatives’ original cost.  Derivatives can involve leverage.
 
Leveraging Risk:   Leverage involves investment exposure in an amount exceeding the initial investment. Leverage can cause increased volatility by magnifying gains or losses.
 
Counterparty and Third Party Risk:   Transactions involving a counterparty or third party other than the issuer of the instrument 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.

 
Page 3 of 5

 

MFS Lifetime 2010 Fund

Liquidity Risk:   It may not be possible to sell certain investments, types of investments, and/or segments of the market at any particular time or at an acceptable price.
 
Performance Information
The bar chart and performance table below are intended to provide some indication of the risks of investing in the fund by showing changes in the fund’s performance over time and how the fund’s performance over time compares with that of a broad measure of market performance and one or more other measures of performance for markets in which the fund may invest.
 
The fund’s past performance (before and after taxes) does not necessarily indicate how the fund will perform in the future. Updated performance is available online at mfs.com or by calling 1-800-225-2606.
 
Class A Bar Chart.   The bar chart does not take into account any sales charges (loads) that you may be required to pay upon purchase or redemption of the fund’s shares. If these sales charges were included, they would reduce the returns shown.
The total return for the six-month period ended June 30, 2013 was 0.81%.  During the period(s) shown in the bar chart, the highest quarterly return was 9.70% (for the calendar quarter ended June 30, 2009) and the lowest quarterly return was (8.50)% (for the calendar quarter ended December 31, 2008).
 
Performance Table.
Average Annual Total Returns
 
(for the Periods Ended December 31, 2012)
 
Share Class
1 YEAR
5 YEARS
LIFE
INCEPTION 09-29-2005
Returns Before Taxes
     
B Shares
4.13%
4.21%
5.26%
C Shares
7.12%
4.53%
5.23%
I Shares
9.13%
5.57%
6.30%
R1 Shares
8.13%
4.52%
5.20%
R2 Shares
8.58%
5.03%
5.70%
R3 Shares
8.87%
5.31%
5.98%
R4 Shares
9.23%
5.58%
6.26%
A Shares
2.67%
4.06%
5.14%
Returns After Taxes on Distributions
A Shares
1.90%
3.05%
4.18%
Returns After Taxes on Distributions and Sale of Fund Shares
A Shares
1.80%
2.89%
3.88%
Index Comparisons (Reflects no deduction for fees, expenses or taxes)
     
  Barclays  U.S. Aggregate Bond Index
4.21%
5.95%
5.68%
  MFS Lifetime 2010 Fund Blended Index *
 
7.48%
4.85%
5.72%
* As of December 31, 2012, the MFS Lifetime 2010 Fund Blended Index (the "Blended Index") consisted of the following indices and weightings:  73% Barclays U.S. Aggregate Bond Index; 20% Standard & Poor’s 500 Stock Index; 5% MSCI EAFE Index; 1% Dow Jones-UBS Commodity Index; and 1% FTSE EPRA/NAREIT Developed Real Estate Index.  The components and weightings of the Blended Index may have differed during the period, and may differ in the future.
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your own tax situation, and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. The after-tax returns are shown for only one of the fund’s classes of shares, and after-tax returns for the fund’s other classes of shares will vary from the returns shown.
 
Investment Adviser
MFS serves as the investment adviser for the fund.
 
Portfolio Manager(s)

Portfolio Manager
Since
Title
Joseph C. Flaherty, Jr.
2005
Investment Officer of MFS
 
Purchase and Sale of Fund Shares
You may purchase and redeem shares of the fund each day the New York Stock Exchange is open for trading. You may purchase or redeem shares either by having your financial intermediary process your purchase or redemption, or through MFS Service Center, Inc. (MFSC) by overnight mail (MFSC, c/o Boston Financial Data Services, 30 Dan Road, Canton, MA  02021-2809), by mail ([Fund Name], P.O. Box 55824, Boston, MA 02205-5824), by telephone (1-800-225-2606), or via the Internet at mfs.com (MFS Access).
 
The fund’s initial and subsequent investment minimums generally are as follows:
 
Class
 Initial Minimum
  Subsequent Minimum
Class A, Class B, Class C
None – automatic investment plans and certain asset-based fee programs
$25 – employer-sponsored retirement plans
$250 – Traditional and Roth IRAs
$1,000 – other accounts
$50 – by check and non-systematic written exchange request, and via MFSC telephone representatives
None – other purchases
Class I, Class R1, Class R2, Class R3, Class R4
None
None
 
The Board of Trustees of the fund has approved the proposed reorganization of the fund into the MFS Lifetime Retirement Income Fund on or about the close of business June 20, 2014. A shareholder vote is not required to complete the transaction.
 
The summary prospectus for the MFS Lifetime Retirement Income Fund and a description of the terms of the proposed reorganization is expected to be mailed to shareholders of the fund on or about February 24, 2014.
 
In light of the proposed transaction, sales of fund shares and exchanges into this fund are expected to be suspended on or about the close of business June 18, 2014.

 
Page 4 of 5

 

MFS Lifetime 2010 Fund

Taxes
If your shares are held in a taxable account, the fund’s distributions are taxable to you, and will be taxed as ordinary income and/or capital gains.
 
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), the fund, MFS, and MFS’ affiliates may pay the financial intermediary for the sale of shares of a fund and/or the servicing of shareholder accounts. These payments may create a conflict of interest by influencing your broker/dealer or other financial intermediary and your salesperson to recommend the fund over another investment. Ask your financial intermediary or visit your financial intermediary’s Web site for more information.
 
Page 5 of 5
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