MFS® Blended Research® Growth Equity Fund

MFS® Blended Research® Growth Equity Fund Summary of Key Information

Investment Objective

The fund’s investment objective is to seek capital appreciation.

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 7 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):

Shareholder Fees - MFS® Blended Research® Growth Equity Fund	A		B	C	I	R1	R2	R3	R4	Class R6
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	5.75%		none	none	none	none	none	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)	1.00%	[1]	4.00%	1.00%	none	none	none	none	none	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):

Annual Fund Operating Expenses - MFS® Blended Research® Growth Equity Fund		A	B	C	I	R1	R2	R3	R4	Class R6
Management Fee		0.40%	0.40%	0.40%	0.40%	0.40%	0.40%	0.40%	0.40%	0.40%
Distribution and/or Service (12b-1) Fees		0.25%	1.00%	1.00%	none	1.00%	0.50%	0.25%	none	none
Other Expenses		5.32%	5.32%	5.32%	5.32%	5.32%	5.32%	5.32%	5.32%	5.31%
Total Annual Fund Operating Expenses		5.97%	6.72%	6.72%	5.72%	6.72%	6.22%	5.97%	5.72%	5.71%
Fee Reductions and/or Expense Reimbursements	[1]	(5.23%)	(5.23%)	(5.23%)	(5.23%)	(5.23%)	(5.23%)	(5.23%)	(5.23%)	(5.26%)
Total Annual Fund Operating Expenses After Fee Reductions and/or Expense Reimbursements		0.74%	1.49%	1.49%	0.49%	1.49%	0.99%	0.74%	0.49%	0.45%

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:

Expense Example - MFS® Blended Research® Growth Equity Fund - USD ($)	1 YEAR	3 YEARS	5 YEARS	10 YEARS
A	646	1,808	2,948	5,701
B	552	1,819	3,033	5,821
C	252	1,519	2,840	5,948
I	50	1,237	2,407	5,259
R1	152	1,519	2,840	5,948
R2	101	1,379	2,626	5,613
R3	76	1,308	2,517	5,439
R4	50	1,237	2,407	5,259
Class R6	46	1,232	2,400	5,250

Expense Example No Redemption - MFS® Blended Research® Growth Equity Fund - USD ($)	1 YEAR	3 YEARS	5 YEARS	10 YEARS
B	152	1,519	2,840	5,821
C	152	1,519	2,840	5,948

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.  For the period from the fund’s commencement of operations on September 15, 2015 to the fund’s fiscal year end of May 31, 2016, the fund’s portfolio turnover rate was 28% of the average value of its portfolio.

Principal Investment Strategies

MFS (Massachusetts Financial Services Company, the fund’s investment adviser) normally invests at least 80% of the fund’s net assets in equity securities.

Equity securities include common stocks and other securities that represent an ownership interest (or right to acquire an ownership interest) in a company or other issuer.

MFS focuses on investing the fund’s assets in the stocks of companies it believes to have above average earnings growth potential compared to other companies (growth companies).

While MFS may invest the fund’s assets in companies of any size, MFS primarily invests in companies with large capitalizations.

MFS may invest the fund’s assets in foreign securities.

MFS normally allocates the fund’s investments across different industries and sectors, but MFS may invest a significant percentage of the fund’s assets in issuers in a single or small number of industries or sectors.

MFS uses a bottom-up approach to buying and selling investments for the fund. Investments are selected primarily based on blending fundamental and quantitative research. MFS uses fundamental analysis of individual issuers to determine a fundamental rating for an issuer.  MFS uses quantitative analysis to determine a quantitative rating for an issuer. MFS then constructs the portfolio considering the blended rating from combining the fundamental rating and the quantitative rating, as well as issuer, industry, and sector weightings, market capitalization, volatility, and other factors, with a goal of constructing a portfolio with a target predicted tracking error of approximately 2% compared to the Russell 1000® Growth Index (the “Index”).  Tracking error generally measures how the differences between the fund’s monthly returns and the Index’s monthly returns have varied over a specified time period.

For purposes of the fund’s 80% policy, net assets include the amount of any borrowings for investment purposes.

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. 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:

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.

Investment Strategy Risk:  There is no assurance that the fund will meet its target predicted tracking error over the long term or for any year or period of years, or that the fund’s predicted tracking error and actual tracking error will be similar.  The fund’s strategy to target a predicted tracking error of approximately 2% compared to the Index and to blend fundamental and quantitative research may not produce the intended results. In addition, MFS fundamental research is not available for all issuers.

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.

Foreign Risk:  Exposure to foreign 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.

Industry and Sector Focus Risk:  Issuers in an industry or sector can react similarly to market, economic, political, regulatory, geopolitical, and other conditions.  If MFS invests a significant percentage of the fund’s assets in issuers within an industry or sector, the fund’s performance will be affected by conditions in that industry or sector.

Liquidity Risk:  It may be difficult to value, and it may not be possible to sell, certain investments, types of investments, and/or investments in certain segments of the market, and the fund may have to sell certain of these investments at a price or time that is not advantageous in order to meet redemptions or other cash needs.

Investment Selection Risk:  MFS’ investment analysis, its development and use of quantitative models, and its selection of investments 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. Investments selected using quantitative models may not produce the intended results due to the factors used in the models, the weight placed on each factor in the models, changing sources of market return, and technical issues in the design, development, implementation, and maintenance of the models (e.g., incomplete or inaccurate data, programming or other software issues, and technology failures).

Performance Information

The bar chart and performance table are not included because the fund has not had a full calendar year of operations.

[1] This contingent deferred sales charge (CDSC) applies to shares purchased without an initial sales charge and redeemed within 18 months of purchase.

[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 0.74% of the class' average daily net assets annually for each of Class A and Class R3 shares, 1.49% of the class' average daily net assets annually for each of Class B, Class C, and Class R1 shares, 0.49% of the class' average daily net assets annually for each of Class I and Class R4 shares, 0.99% of the class' average daily net assets annually for Class R2 shares, and 0.45% of the class' average daily net assets annually for Class R6 shares. This written agreement will continue until modified by the fund's Board of Trustees, but such agreement will continue until at least September 30, 2017.