MFS Growth Fund (Prospectus Summary) | MFS Growth 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. The annual fund operating expenses for Class W shares
are based on estimated expenses for the current fiscal year expressed as a
percentage of the fund's 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 7 of the fund's prospectus and "Waivers of Sales Charges" on page 13 of the
fund's statement of additional information Part I.

Shareholder Fees (fees paid directly from your investment):

Shareholder Fees MFS Growth Fund	A		B	C	I	W	R1	R2	R3	R4
Shareholder Fees, Column Name	A		B	C	I AND W	I AND W	ALL R	ALL R	ALL R	ALL R
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 Growth Fund	A	B	C	I	W	R1	R2	R3	R4
Operating Expenses, Column Name	A	B	C	I	W	R1	R2	R3	R4
Management Fee	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%
Distribution and/or Service (12b-1) Fees	0.25%	1.00%	1.00%	none	0.10%	1.00%	0.50%	0.25%	none
Other Expenses	0.30%	0.30%	0.30%	0.30%	0.30%	0.30%	0.30%	0.30%	0.30%
Total Annual Fund Operating Expenses	1.30%	2.05%	2.05%	1.05%	1.15%	2.05%	1.55%	1.30%	1.05%

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 Growth Fund (USD $)	Expense Example, By Year, Column Name	Expense Example, With Redemption, 1 Year	Expense Example, With Redemption, 3 Years	Expense Example, With Redemption, 5 Years	Expense Example, With Redemption, 10 Years
A	Class A Shares	700	963	1,247	2,053
B	Class B Shares assuming redemption at end of period	608	943	1,303	2,187
C	Class C Shares assuming redemption at end of period	308	643	1,103	2,379
I	Class I Shares	107	334	579	1,283
W	Class W Shares	117	365	633	1,398
R1	Class R1 Shares	208	643	1,103	2,379
R2	Class R2 Shares	158	490	845	1,845
R3	Class R3 Shares	132	412	713	1,568
R4	Class R4 Shares	107	334	579	1,283

Expense Example, No Redemption MFS Growth Fund (USD $)	Expense Example, No Redemption, By Year, Column Name	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
B	Class B Shares assuming no redemption at end of period	208	643	1,103	2,187
C	Class C Shares assuming no redemption at end of period	208	643	1,103	2,379

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 103% of the average value of its portfolio.

Principal Investment Strategies

MFS (Massachusetts Financial Services Company, the fund's investment adviser)
normally invests the fund's assets primarily in equity securities. Equity
securities include common stocks, preferred stocks, securities convertible into
stocks, and depositary receipts for those securities.

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).

MFS may invest the fund's assets in companies of any size.

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

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 issuers and their potential in light of their current financial
condition, and market, economic, political, and regulatory conditions. Factors
considered may include analysis of an issuer's earnings, cash flows, competitive
position, and management ability. Quantitative models that systematically
evaluate an issuer's valuation, price and earnings momentum, earnings quality,
and other factors may also be considered.

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.

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, political, regulatory,
geopolitical, or 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.

Investment Selection Risk:  The MFS analysis of an investment can be incorrect
and 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.

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.

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.

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.

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.

Class A Bar Chart.

The total return for the three-month period ended March 31, 2011 was 4.89%.
During the period(s) shown in the bar chart, the highest quarterly return was
25.31% (for the calendar quarter ended December 31, 2001) and the lowest
quarterly return was (31.50)% (for the calendar quarter ended September 30,
2001).

Performance Table.

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.

Average Annual Total Returns (for the Periods Ended December 31, 2010)

Average Annual Total Returns MFS Growth Fund	Average Annual Returns, Label	Average Annual Returns, 1 Year	Average Annual Returns, 5 Years	Average Annual Returns, 10 Years
A	A Shares Returns Before Taxes	9.00%	4.08%	(0.54%)
B	B Shares Returns Before Taxes	10.82%	4.19%	(0.55%)
C	C Shares Returns Before Taxes	13.82%	4.53%	(0.70%)
I	I Shares Returns Before Taxes	15.96%	5.59%	0.30%
W	W Shares Returns Before Taxes
R1	R1 Shares Returns Before Taxes	14.83%	4.50%	(0.81%)
R2	R2 Shares Returns Before Taxes	15.41%	5.00%	(0.34%)
R3	R3 Shares Returns Before Taxes	15.70%	5.26%	(0.05%)
R4	R4 Shares Returns Before Taxes	15.97%	5.55%	0.24%
After Taxes on Distributions A	A Shares Returns After Taxes on Distributions	9.00%	3.86%	(0.65%)
After Taxes on Distributions and Sales A	A Shares Returns After Taxes on Distributions and Sale of Fund Shares	5.85%	3.50%	(0.46%)
Russell 1000 Growth Index	Russell 1000 Growth Index (Reflects no deduction for fees, expenses or taxes)	16.71%	3.75%	0.02%

[1] On shares purchased without an initial sales charge and redeemed within 24 months of purchase.