Effective immediately, the sub-sections entitled “Fees and Expenses” and “Example” beneath the main heading "Summary of Key Information" are restated in their entirety as follows:
 
Summary of Key Information
 
Fees and Expenses
This table describes the fees and expenses that you may pay when you buy and hold shares of the fund. Expenses have been adjusted to reflect current fee arrangements. The annual fund operating expenses for Class R5 shares are based on estimated "Other Expenses" for the current fiscal year expressed as a percentage of the fund's estimated average net assets during the period.
 
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 6 of the fund’s prospectus and “Waivers of Sales Charges” on page I-14 of the fund’s statement of additional information Part I.
 
Shareholder Fees (fees paid directly from your investment):
 
Share Class
A
B
C
I
ALL R
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
R5
Management Fee
0.90%
0.90%
0.90%
0.90%
0.90%
0.90%
0.90%
0.90%
0.90%
Distribution and/or Service       (12b-1) Fees
0.25%
1.00%
1.00%
None
1.00%
0.50%
0.25%
None
None
Other Expenses
0.51%
0.51%
0.51%
0.51%
0.51%
0.51%
0.51%
0.51%
0.51%
Total Annual Fund Operating Expenses
1.66%
2.41%
2.41%
1.41%
2.41%
1.91%
1.66%
1.41%
1.41%
Fee Reductions and/or Expense Reimbursements 1
(0.21)%
(0.21)%
(0.21)%
(0.21)%
(0.21)%
(0.21)%
(0.21)%
(0.21)%
(0.21)%
Total Annual Fund Operating Expenses After Fee Reductions and/or Expense Reimbursements
1.45%
2.20%
2.20%
1.20%
2.20%
1.70%
1.45%
1.20%
1.20%

#
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 interest, taxes, extraordinary expenses, brokerage and transaction costs, and investment-related expenses (such as interest and borrowing expenses incurred in connection with the fund's investment activity), such that "Total Annual Fund Operating Expenses" do not exceed 1.45% of the fund's average daily net assets annually for each of Class A and Class R3 shares, 2.20% of the fund's average daily net assets annually for each of Class B, Class C, and Class R1 shares, 1.20% of the fund's average daily net assets annually for each of Class I, Class R4, and Class R5 shares, and 1.70% of the fund's average daily net assets annually for Class R2 shares. This written agreement will continue until modified by the fund's Board of Trustees, but such agreement will continue until at least December 31, 2013.


 
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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
$714
$1,049
$1,407
$2,411
Class B Shares assuming
       
    redemption at end of period
$623
$1,031
$1,467
$2,544
    no redemption at end of period
$223
$731
$1,267
$2,544
Class C Shares assuming
       
    redemption at end of period
$323
$731
$1,267
$2,730
    no redemption at end of period
$223
$731
$1,267
$2,730
Class I Shares
$122
$426
$751
$1,673
Class R1 Shares
$223
$731
$1,267
$2,730
Class R2 Shares
$173
$580
$1,012
$2,216
Class R3 Shares
$148
$503
$882
$1,948
Class R4 Shares
$122
$426
$751
$1,673
Class R5 Shares
$122
$426
$751
$1,673
 
Effective immediately, the sub-section entitled “Investment Adviser” beneath the main heading "Management of the Fund" is restated as follows, up to but not including the sub-heading "Disclosure of Portfolio Holdings":
 
Investment Adviser
 
MFS, located at 111 Huntington Avenue, Boston, Massachusetts, serves as the investment adviser for the fund.  Subject to the supervision of the fund’s Board of Trustees, MFS is responsible for managing the fund’s investments, executing transactions and providing related administrative services and facilities under an Investment Advisory Agreement between the fund and MFS.
 
The management fee set forth in the Investment Advisory Agreement is 0.90% of the fund's average daily net assets annually up to $1 billion; 0.80% of the fund's average daily net assets annually in excess of $1 billion and up to $2.5 billion; and 0.75% of the fund's average daily net assets annually in excess of $2.5 billion.
 
MFS has agreed in writing to bear the fund's expenses, excluding interest, taxes, extraordinary expenses, brokerage and transaction costs and investment-related expenses (such as interest and borrowing expenses incurred in connection with the fund's investment activity), such that "Total Annual Fund Operating Expenses" do not exceed 1.45% of the fund's average daily net assets annually for each of Class A and Class R3 shares, 2.20% of the fund's average daily net assets annually for each of Class B, Class C, and Class R1 shares, 1.20% of the fund's average daily net assets annually for each of Class I, Class R4, and Class R5 shares, and 1.70% of the fund's average daily net assets annually for Class R2 shares. This written agreement will continue until modified by the fund's Board of Trustees, but such agreement will continue until at least December 31, 2013.
 
A discussion regarding the basis for the Board of Trustees’ approval of the Investment Advisory Agreement is available in the fund’s semiannual report for the period that ended August 31, 2012.
 
MFS is America’s oldest mutual fund organization. MFS and its predecessor organizations have a history of money management dating from 1924 and the founding of the first mutual fund, Massachusetts Investors Trust. Net assets under the management of the MFS organization were approximately $303 billion as of October 31, 2012.
 
Effective immediately, the following new sub-section entitled “Special Servicing Agreement" is inserted directly after the sub-section entitled "Shareholder Servicing Agent” beneath the main heading "Management of the Fund":
 
Special Servicing Agreement
 
Under a Special Servicing Agreement among MFS, each fund which invests primarily in other funds advised by MFS ("MFS Fund-of-Funds"), and the fund, the fund pays a portion of the transfer agent-related expenses of each MFS Fund-of-Funds that invests in the fund, including sub-accounting fees payable to financial intermediaries, to the extent such payments are less than the amount of benefits realized or expected to be realized by the fund from the investment in the fund by the MFS Fund-of-Funds.
 
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