<PAGE>
<TABLE>
<S> <C>
MFS-REGISTERED TRADEMARK- EMERGING GROWTH
SERIES
MFS-REGISTERED TRADEMARK- HIGH INCOME
SERIES PROSPECTUS
MFS-REGISTERED TRADEMARK- WORLD GOVERNMENTS May 1,
SERIES 1997
</TABLE>
- --------------------------------------------------------------------------------
<TABLE>
<S> <C> <S> <C>
MFS-Registered Trademark- VARIABLE INSURANCE TRUST-SM-
</TABLE>
MFS Variable Insurance Trust (the "Trust") is an open-end management investment
company offering insurance company separate accounts a selection of investment
vehicles for variable annuity and variable life insurance contracts (the
"Contracts"). Currently the Trust offers shares of beneficial interest of 12
separate mutual fund series (individually or collectively hereinafter referred
to as a "Series" or the "Series"), three of which are offered pursuant to this
Prospectus:
- -- MFS EMERGING GROWTH SERIES (the "Emerging Growth Series"), which seeks to
provide long-term growth of capital;
- -- MFS HIGH INCOME SERIES (the "High Income Series"), which seeks high current
income by investing primarily in a professionally managed diversified
portfolio of fixed income securities, some of which may involve equity
features; and
- -- MFS WORLD GOVERNMENTS SERIES (the "World Governments Series"), which seeks
not only preservation but also growth of capital, together with moderate
current income.
-------------------
THE HIGH INCOME SERIES MAY INVEST UP TO 100% OF ITS NET ASSETS IN LOWER RATED
BONDS, COMMONLY KNOWN AS "JUNK BONDS," THAT ENTAIL GREATER RISKS, INCLUDING
DEFAULT RISKS, THAN THOSE FOUND IN HIGHER RATED SECURITIES. INVESTORS SHOULD
CAREFULLY CONSIDER THESE RISKS BEFORE INVESTING (SEE "ADDITIONAL RISK FACTORS --
LOWER RATED BONDS"). THE EMERGING GROWTH SERIES IS INTENDED FOR INVESTORS WHO
UNDERSTAND AND ARE WILLING TO ACCEPT THE RISKS ENTAILED IN SEEKING LONG-TERM
GROWTH OF CAPITAL. BECAUSE OF THEIR INVESTMENT POLICIES PERMITTING INVESTMENT IN
FOREIGN SECURITIES, INVESTMENTS IN EACH SERIES MAY BE SUBJECT TO A GREATER
DEGREE OF RISK THAN INVESTMENTS IN OTHER INVESTMENT COMPANIES WHICH INVEST
ENTIRELY IN DOMESTIC SECURITIES.
-------------------
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
-------------------
SHARES OF THE TRUST ARE AVAILABLE AND ARE BEING MARKETED AS A POOLED FUNDING
VEHICLE FOR LIFE INSURANCE COMPANIES WRITING ALL TYPES OF CONTRACTS.
This Prospectus sets forth concisely the information about each Series that a
prospective investor should know before applying for the Contracts offered by
the separate accounts of certain insurance companies ("Participating Insurance
Companies"). Investors are advised to read this Prospectus and the applicable
Contract prospectus carefully and retain them for future reference. If you
require more detailed information, a Statement of Additional Information dated
May 1, 1997, as amended or supplemented from time to time (the "SAI"), is
available upon request without charge and may be obtained by calling or by
writing to the Shareholder Servicing Agent (see back cover for address and phone
number). The SAI, which is incorporated by reference into this Prospectus, has
been filed with the Securities and Exchange Commission (the "SEC"). The SEC
maintains an Internet World Wide Web site that contains the SAI, materials that
are incorporated by reference into this Prospectus and the SAI, and other
information regarding the Series. This Prospectus is available on the Adviser's
Internet World Wide Web site at http://www.mfs.com.
INVESTORS SHOULD READ THIS PROSPECTUS AND RETAIN IT FOR FUTURE REFERENCE.
<PAGE>
TABLE OF CONTENTS
<TABLE>
<CAPTION>
PAGE
---
<S> <C>
1. Expense Summary................................................................................ 3
2. Investment Concept of the Trust................................................................ 3
3. Condensed Financial Information................................................................ 5
4. Investment Objectives and Policies............................................................. 8
MFS Emerging Growth Series..................................................................... 8
MFS High Income Series......................................................................... 8
MFS World Governments Series................................................................... 9
5. Investment Techniques.......................................................................... 10
6. Additional Risk Factors........................................................................ 16
7. Management of the Series....................................................................... 19
8. Information Concerning Shares of Each Series................................................... 21
Purchases and Redemptions...................................................................... 21
Net Asset Value................................................................................ 21
Distributions.................................................................................. 22
Tax Status..................................................................................... 22
Description of Shares, Voting Rights and Liabilities........................................... 22
Performance Information........................................................................ 23
Expenses....................................................................................... 23
Shareholder Communications..................................................................... 24
Appendix A -- Description of Bond Ratings.......................................................... A-1
Appendix B -- Portfolio Composition Charts......................................................... B-1
</TABLE>
2
<PAGE>
1. EXPENSE SUMMARY
ANNUAL OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS):
<TABLE>
<CAPTION>
MFS
EMERGING MFS HIGH MFS WORLD
GROWTH INCOME GOVERNMENTS
SERIES SERIES SERIES
-------- -------- -----------
<S> <C> <C> <C>
Management Fee.............................................. 0.75% 0.75% 0.75%
Other Expenses (after expense limitation)(1)(2)............. 0.25% 0.25% 0.25%
-------- --- -----------
Total Operating Expenses (after expense limitation)(2)...... 1.00% 1.00% 1.00%
<FN>
- ------------------------
(1) Each Series has an expense offset arrangement which reduces the Series' custodian fee based upon the amount of
cash maintained by the Series with its custodian and dividend disbursing agent, and may enter into other such
arrangements and directed brokerage arrangements (which would also have the effect of reducing the Series'
expenses). Any such fee reductions are not reflected under "Other Expenses."
(2) The Adviser has agreed to bear expenses for each Series, subject to reimbursement by each Series, such that each
Series' "Other Expenses" shall not exceed 0.25% of the average daily net assets of the Series during the current
fiscal year. See "Information Concerning Shares of Each Series--Expenses." Otherwise, "Other Expenses" and "Total
Operating Expenses" for each Series would be:
</TABLE>
<TABLE>
<CAPTION>
"TOTAL OPERATING
"OTHER EXPENSES" EXPENSES"
WITHOUT WITHOUT
SERIES EXPENSE LIMITATION EXPENSE LIMITATION
- -------------------------------------- --------------------- -------------------------
<S> <C> <C>
Emerging Growth....................... 0.41% 1.16%
High Income........................... 0.87% 1.62%
World Governments..................... 1.28% 2.03%
</TABLE>
The purpose of the expense table above is to assist investors in
understanding the various costs and expenses that a shareholder of the Series
will bear directly or indirectly. The Series' annual operating expenses do not
reflect expenses imposed by separate accounts of Participating Insurance
Companies through which an investment in a Series is made or their related
Contracts. A separate account's expenses are disclosed in the prospectus through
which the Contract relating to that separate account is offered for sale.
2. INVESTMENT CONCEPT OF THE TRUST
The Trust is an open-end, registered management investment company comprised
of the following twelve series: Emerging Growth Series, Value Series, Research
Series, Growth With Income Series, Total Return Series, Utilities Series, High
Income Series, World Governments Series, Strategic Fixed Income Series, Bond
Series, Limited Maturity Series and Money Market Series. Each Series is a
segregated, separately managed portfolio of securities. All of the Series,
except the Utilities Series, World Governments Series and Strategic Fixed Income
Series, are diversified. Additional series may be created from time to time. The
Trust was organized as a business trust under the laws of The Commonwealth of
Massachusetts by a Declaration of Trust dated February 1, 1994.
The Trust currently offers shares of each Series to insurance company
separate accounts that fund Contracts. Separate accounts may purchase or redeem
shares at net asset value without any sales or redemption charge. Fees and
charges imposed by a separate account, however, will affect the actual return to
the holder of a Contract. A separate account may also impose certain
restrictions or limitations on the allocation of purchase payments or Contract
value to one or more Series, and not all Series may be available in connection
with a particular Contract. Prospective investors should consult the applicable
Contract prospectus for information regarding fees and expenses of the Contract
and separate account and any applicable restrictions or limitations. The Trust
assumes no responsibility for such prospectuses.
Shares of the Series are offered to the separate accounts of Participating
Insurance Companies that are affiliated or unaffiliated ("shared funding").
Shares of the Series may serve as the underlying investments for both variable
annuity and variable life insurance contracts ("mixed funding"). Due to
differences in tax treatment or other considerations, the interests of various
Contract owners might at some time be in conflict. The Trust currently does not
foresee any such conflict. Nevertheless, the Trust's Trustees intend to monitor
events in order to identify any material irreconcilable conflicts which may
possibly arise and to determine what action, if any, should be taken in response
thereto. If such a conflict were to occur, one or more separate accounts of the
Participating Insurance Companies might be required to withdraw its investments
in one one or more Series. This might force a Series to sell securities at
disadvantageous prices.
3
<PAGE>
Individual Contract holders are not the "shareholders" of the Trust. Rather,
the Participating Insurance Companies and their separate accounts are the
shareholders or investors, although such companies may pass through voting
rights to their Contract holders.
The Trust's Board of Trustees provides broad supervision over the affairs of
the Trust and the Series. Massachusetts Financial Services Company, a Delaware
corporation ("MFS" or the "Adviser"), is the investment adviser to each Series.
A majority of the Trustees of the Trust are not affiliated with the Adviser. The
Adviser is responsible for the management of the assets of each Series and the
officers of the Trust are responsible for the operations. The Adviser manages
the Series' portfolios from day to day in accordance with the investment
objectives and policies of each Series. The selection of investments and the way
they are managed depend on the conditions and trends in the economy and the
financial marketplaces.
4
<PAGE>
3. CONDENSED FINANCIAL INFORMATION
The following financial information has been audited since the commencement of
investment operations of such Series and should be read in conjunction with the
financial statements included in the Series' Annual Reports to Shareholders.
These financial statements are incorporated by reference into the SAI in
reliance upon the report of the Series' independent auditors given upon their
authority as experts in accounting and auditing. The Series' current independent
auditors are Deloitte & Touche LLP.
EMERGING GROWTH SERIES
<TABLE>
<CAPTION>
YEAR ENDED PERIOD ENDED
DECEMBER 31, 1996 DECEMBER 31, 1995*
----------------- ------------------
<S> <C> <C>
Per share data (for a share outstanding throughout each period):
Net asset value--beginning of period............................. $ 11.41 $10.00
-------- ------
Income from investment operations#--
Net investment income (loss)Section............................ $ (0.01) $ 0.01
Net realized and unrealized gain on investments and foreign
currency transactions........................................ 1.95 1.74
-------- ------
Total from investment operations............................. $ 1.94 $ 1.75
-------- ------
Less distributions declared to shareholders--
From net investment income..................................... $ -- $(0.01)
From net realized gain on investments and foreign currency
transactions................................................. (0.06) (0.26)
In excess of net realized gain on investments and foreign
currency transactions........................................ (0.05) --
Tax return of capital.......................................... -- (0.07)
-------- ------
Total distributions declared to shareholders................. $ (0.11) $(0.34)
-------- ------
Net asset value--end of period................................... $ 13.24 $11.41
-------- ------
-------- ------
Total return..................................................... 17.02% 17.41%++
Ratios (to average net assets)/Supplemental dataSection:
Expenses....................................................... 1.00% 1.00%+
Net investment income (loss)................................... (0.08)% 0.10%+
Portfolio turnover............................................... 96% 73%
Average commission rate###....................................... $ 0.0401 --
Net assets at end of period (000 omitted)........................ $104,956 $3,869
- ---------
* For the period from the commencement of investment operations, July 24, 1995 to December 31, 1995.
+ Annualized.
++ Not annualized.
# Per share data is based on average shares outstanding.
### Average commission rate is calculated for Series' with fiscal years beginning on or after September 1, 1995.
Section The Adviser voluntarily agreed to maintain the expenses of the Series at not more than 1.00% of average daily
net assets. To the extent actual expenses were over these limitations, the net investment loss per share and
the ratios would have been:
Net investment loss.............................................. $(0.03) $(0.18)
Ratios (to average net assets):
Expenses....................................................... 1.16% 2.91%+
Net investment loss............................................ (0.23)% (1.78)%+
</TABLE>
5
<PAGE>
HIGH INCOME SERIES
<TABLE>
<CAPTION>
YEAR ENDED PERIOD ENDED
DECEMBER 31, 1996 DECEMBER 31, 1995*
------------------- ------------------
<S> <C> <C>
Per share data (for a share outstanding throughout each period):
Net asset value--beginning of period............................. $ 10.29 $10.00
------- ------
Income from investment operations#--
Net investment incomeSection................................... $ 0.89 $ 0.34
Net realized and unrealized gain on investments................ 0.32 0.18
------- ------
Total from investment operations............................. $ 1.21 $ 0.52
------- ------
Less distributions declared to shareholders--
From net investment income..................................... $ (0.53) $(0.23)
From net realized gain on investments.......................... (0.10) --
------- ------
Tota distributions declared to shareholders.................. $ (0.63) $(0.23)
------- ------
Net asset value--end of period................................... $ 10.87 $10.29
------- ------
------- ------
Total return..................................................... 11.80% 5.25%++
Ratios (to average net assets)/Supplemental dataSection:
Expenses....................................................... 1.00% 1.00%+
Net investment income.......................................... 8.18% 8.17%+
Portfolio turnover............................................... 135% 32%
Net assets at end of period (000 omitted)........................ $12,994 $1,946
<FN>
- ------------------------
* For the period from the commencement of investment operations, July 26, 1995 to December 31, 1995.
+ Annualized.
++ Not annualized.
# Per share data is based on average shares outstanding.
Section The Adviser voluntarily agreed to maintain the expenses of the Series at not more than 1.00% of average daily
net assets. To the extent actual expenses were over these limitations, the net investment income per share and
the ratios would have been:
Net investment income............................................ $0.82 $0.20
Ratios (to average net assets):
Expenses....................................................... 1.62% 4.38%+
Net investment income.......................................... 7.56% 4.82%+
</TABLE>
6
<PAGE>
WORLD GOVERNMENTS SERIES
<TABLE>
<CAPTION>
YEAR ENDED YEAR ENDED PERIOD ENDED
DECEMBER 31, 1996 DECEMBER 31, 1995 DECEMBER 31, 1994*
------------------- ------------------ ------------------
<S> <C> <C> <C>
Per share data (for a share outstanding throughout each period):
Net asset value--beginning of period............................. $ 10.17 $ 9.82 $10.00
------- ------ ------
Income from investment operations#--
Net investment incomeSection................................... $ 0.60 $ 0.63 $ 0.17
Net realized and unrealized gain (loss) on investments and
foreign currency transactions................................ (0.19) 0.78 (0.09)
------- ------ ------
Total from investment operations............................. $ 0.41 $ 1.41 $ 0.08
------- ------ ------
Less distributions declared to shareholders--
From net investment income..................................... $ -- $(0.42) $(0.17)
In excess of net investment income............................. -- (0.54) (0.09)
Tax return of capital.......................................... -- (0.10) --
------- ------ ------
Total distributions declared to shareholders................. $ -- $(1.06) $(0.26)
------- ------ ------
Net asset value--end of period................................... $ 10.58 $10.17 $ 9.82
------- ------ ------
------- ------ ------
Total return..................................................... 4.03% 14.38% 0.79%++
Ratios (to average net assets)/Supplemental dataSection:
Expenses....................................................... 1.00% 1.00% 1.00%+
Net investment income.......................................... 5.84% 6.05% 4.68%+
Portfolio turnover............................................... 361% 211% 62%
Net assets at end of period (000 omitted)........................ $26,023 $7,424 $2,881
</TABLE>
- ------------------------
<TABLE>
<C> <S>
* For the period from the commencement of investment operations, June 14, 1994 to December 31, 1994.
+ Annualized.
++ Not annualized.
# Per share data is based on average shares outstanding.
Section The Adviser voluntarily agreed to maintain the expenses of the Series at not more than 1.00% of average daily
net assets. To the extent actual expenses were over these limitations, the net investment income per share and
the ratios would have been:
</TABLE>
<TABLE>
<S> <C> <C> <C>
Net investment income............................................ $0.50 $0.53 $0.16
Ratios (to average net assets):
Expenses....................................................... 2.03% 1.99% 1.10%+
Net investment income.......................................... 4.81% 5.09% 4.58%+
</TABLE>
7
<PAGE>
4. INVESTMENT OBJECTIVES AND POLICIES
Each Series has different investment objectives which it pursues through
separate investment policies, as described below. The differences in objectives
and policies among the Series can be expected to affect the degree of market and
financial risk to which each Series is subject and the return of each Series.
The investment objectives and policies of each Series may, unless otherwise
specifically stated, be changed by the Trustees of the Trust without a vote of
the shareholders. Any investment involves risk and there is no assurance that
the objectives of any Series will be achieved.
In addition to the specific investment practices described below, each
Series may also engage in certain investment techniques as described under the
caption "Investment Techniques" below and in the SAI under the caption
"Investment Techniques." The Series' investments are subject to certain risks,
as described in the above-referenced sections of this Prospectus and the SAI and
as described below under the caption "Additional Risk Factors."
MFS EMERGING GROWTH SERIES -- The Series seeks to provide long-term growth of
capital. Dividend and interest income from portfolio securities, if any, is
incidental to the Series' investment objective of long-term growth of capital.
The Series' policy is to invest primarily (I.E., at least 80% of its assets
under normal circumstances) in common stocks of companies that MFS believes are
early in their life cycle but which have the potential to become major
enterprises (emerging growth companies). Such companies generally would be
expected to show earnings growth over time that is well above the growth rate of
the overall economy and the rate of inflation, and would have the products,
technologies, management and market and other opportunities which are usually
necessary to become more widely recognized as growth companies. Emerging growth
companies can be of any size, and the Series may invest in larger or more
established companies whose rates of earnings growth are expected to accelerate
because of special factors, such as rejuvenated management, new products,
changes in consumer demand, or basic changes in the economic environment. While
the Series will invest primarily in common stocks, the Series may, to a limited
extent, seek appreciation in other types of securities such as fixed income
securities (which may be unrated), convertible securities and warrants when
relative values make such purchases appear attractive either as individual
issues or as types of securities in certain economic environments. The Series
may invest in non-convertible fixed income securities rated lower than
"investment grade" (rated Ba or lower by Moody's Investors Service, Inc.
("Moody's") or BB or lower by Standard & Poor's Ratings Services ("S&P") or
Fitch Investors Service, Inc. ("Fitch")) (commonly known as "junk bonds") or in
comparable unrated securities, when, in the opinion of the Adviser, such an
investment presents a greater opportunity for appreciation with comparable risk
to an investment in "investment grade" securities. Under normal market
conditions, the Series will invest not more than 5% of its net assets in these
securities. For a description of these ratings, see Appendix A to this
Prospectus.
The nature of investing in emerging growth companies involves greater risk
than is customarily associated with investments in more established companies.
Emerging growth companies often have limited product lines, markets or financial
resources, and they may be dependent on one-person management. In addition,
there may be less research available on many promising small and medium sized
emerging growth companies, making it more difficult to find and analyze these
companies. The securities of emerging growth companies may have limited
marketability and may be subject to more abrupt or erratic market movements than
securities of larger, more established growth companies or the market averages
in general. Shares of the Series, therefore, are subject to greater fluctuation
in value than shares of a conservative equity fund or of a growth fund which
invests entirely in proven growth stocks.
Consistent with its investment objective and policies described above, the
Series may also invest up to 25% (and generally expects to invest not more than
15%) of its net assets in foreign securities (including emerging market
securities and Brady Bonds) which are not traded on a U.S. exchange.
MFS HIGH INCOME SERIES -- The investment objective of the High Income Series is
to seek high current income by investing primarily in a professionally managed
diversified portfolio of fixed income securities, some of which may involve
equity features.
Fixed income securities offering the high current income sought by the High
Income Series normally include those fixed income securities which offer a
current yield above that generally available on debt securities in the three
highest rating categories of the recognized rating agencies (commonly known as
"junk bonds" if rated below the four highest categories of recognized rating
agencies). The Series may invest up to 100% of its net assets in such
securities. For a description of these rating categories, see Appendix A to this
Prospectus and Appendix C for a chart showing the Series' holdings of fixed
income securities broken down by rating category as of the end of its most
recent fiscal year. (See
8
<PAGE>
"Additional Risk Factors" below.) However, since available yields and yield
differentials vary over time, no specific level of income or yield differential
can ever be assured. The dividends paid by the Series will increase or decrease
in relation to the income received by the Series from its investments, which
would in any case be reduced by the expenses of the Series before such income is
distributed to its shareholders.
Fixed income securities include preferred and preference stocks and all
types of debt obligations of both domestic and foreign issuers, such as bonds,
debentures, notes, equipment lease certificates, equipment trust certificates
(including interests in trusts or other entities representing such obligations),
conditional sales contracts, commercial paper and obligations issued or
guaranteed by the U.S. Government, any foreign government or any of their
respective political subdivisions, agencies or instrumentalities (including
obligations, such as repurchase agreements, secured by instruments).
Corporate debt securities may bear fixed, fixed and contingent, or variable
rates of interest and may involve equity features, such as conversion or
exchange rights or warrants for the acquisition of stock of the same or a
different issuer; participations based on revenues, sales or profits; or the
purchase of common stock in a unit transaction (where corporate debt securities
and common stock are offered as a unit). Under normal market conditions, not
more than 25% of the value of the total assets of the High Income Series will be
invested in equity securities, including common stocks, warrants and rights.
Consistent with its investment objective and policies described above, the
Series may also invest up to 25% (and generally expects to invest not more than
10%) of its net assets in foreign securities (including emerging market
securities and Brady Bonds) which are not traded on a U.S. exchange. The Series
has authority to invest up to 25% of its total assets in securities issued or
guaranteed by foreign governments or their agencies or instrumentalities. (See
"Additional Risk Factors" below.)
The High Income Series may invest up to 40% of the value of its total assets
in each of the electric utility and telephone industries, but will not invest
more than 25% in either of those industries unless yields available for four
consecutive weeks in the four highest rating categories on new issue bonds in
such industry (issue size of $50 million or more) have averaged in excess of
105% of yields of new issue long-term industrial bonds similarly rated (issue
size of $50 million or more) and, in the opinion of the Adviser, the relative
return available from the electric utility or telephone industry and the
relative risk, marketability, quality and availability of securities of such
industry justifies such an investment.
When and if available, fixed income securities may be purchased at a
discount from face value. However, the High Income Series does not intend to
hold such securities to maturity for the purpose of achieving potential capital
gains, unless current yields on these securities remain attractive. From time to
time the Series may purchase securities not paying interest at the time acquired
if, in the opinion of the Adviser, such securities have the potential for future
income or capital appreciation.
MFS WORLD GOVERNMENTS SERIES -- The World Governments Series' investment
objective is to seek not only preservation but also growth of capital, together
with moderate current income.
The World Governments Series seeks to achieve its investment objective
through a professionally managed, internationally diversified portfolio
consisting primarily of debt securities and to a lesser extent equity
securities. The Series attempts to provide investors with an opportunity to
enhance the value and increase the protection of their investment against
inflation and otherwise by taking advantage of investment opportunities in the
U.S. as well as in other countries where opportunities may be more rewarding. It
is believed that diversification of assets on an international basis decreases
the degree to which events in any one country, including the U.S., can affect
the entire portfolio. Although the percentage of the Series' assets invested in
securities issued abroad and denominated in foreign currencies will vary
depending on the state of the economies of the principal countries of the world,
their financial markets and the relationship of their currencies to the U.S.
dollar, under normal conditions the Series' portfolio is internationally
diversified. However, for temporary defensive reasons or during times of
international political or economic uncertainty or turmoil, most or all of the
Series' investments may be in the U.S.
Under normal economic and market conditions, at least 80% of the Series'
portfolio is invested in debt securities, such as bonds, debentures, mortgage
securities, notes, commercial paper, obligations issued or guaranteed by a
government or any of its political subdivisions, agencies or instrumentalities,
certificates of deposit, as well as debt obligations which may have a call on
common stock by means of a conversion privilege or attached warrants.
9
<PAGE>
Consistent with its investment objective and policies described above, the
Series may invest up to 100% (and generally expects to invest not more than 80%)
of its net assets in foreign securities (including emerging market securities
and Brady Bonds) which are not traded on a U.S. exchange. Although the
percentage of the Series' assets invested in foreign securities will vary, at
least 65% of the Series' assets will be invested in at least three different
countries, one of which may be the U.S., except when the Adviser believes that
investing for temporary defensive purposes is appropriate. The Adviser will
determine the amount of the World Governments Series' assets to be invested in
the U.S. and the amount to be invested abroad. The U.S. assets will be invested
in high quality debt securities and the remainder of the assets will be
diversified among countries where opportunities for total return are expected to
be most attractive. It is currently expected that investments within foreign
countries will be primarily in government securities to minimize credit risks.
The Series will not invest 25% or more of the value of its assets in the
securities of any one foreign government. The portfolio will be managed actively
and the asset allocations modified as the Adviser deems necessary.
The World Governments Series will purchase non-dollar securities denominated
in the currency of countries where the interest rate environment as well as the
general economic climate provide an opportunity for declining interest rates and
currency appreciation. If interest rates decline, such non-dollar securities
will appreciate in value. If the currency also appreciates against the dollar,
the total investment in such non-dollar securities would be enhanced further.
Conversely, a rise in interest rates or decline in currency exchange rates would
adversely affect the Series' return. Investments in non-dollar denominated
securities are evaluated primarily on the strength of a particular currency
against the dollar and on the interest rate climate of that country. Currency is
judged on the basis of fundamental economic criteria (E.G., relative inflation
levels and trends, growth rate forecasts, balance of payments status, and
economic policies) as well as technical and political data. In addition to the
foregoing, interest rates are evaluated on the basis of differentials or
anomalies that may exist between different countries. The Series may hold
foreign currency received in connection with investments in foreign securities
and in anticipation of purchasing foreign securities. (See "Additional Risk
Factors" below.)
The phrase "preservation of capital" when applied to a domestic investment
company is generally understood to imply that the portfolio is invested in very
low risk securities and that the major risk is loss of purchasing power through
the effects of inflation or major changes in interest rates. However, while the
World Governments Series invests in securities which are believed to have
minimal credit risk, an error of judgment in selecting a currency or an interest
rate environment could result in a loss of capital.
It is contemplated that the World Governments Series' long-term debt
investments will consist primarily of securities which are believed by the
Adviser to be of relatively high quality. If after the Series purchases such a
security, the quality of the security deteriorates significantly, the security
will be sold only if the Adviser believes it is advantageous to do so.
5. INVESTMENT TECHNIQUES
LENDING OF PORTFOLIO SECURITIES: Each Series may seek to increase its income
by lending portfolio securities. Such loans will usually be made to member firms
(and subsidiaries thereof) of the New York Stock Exchange (the "Exchange") and
to member banks of the Federal Reserve System, and would be required to be
secured continuously by collateral in cash, U.S. Treasury securities or an
irrevocable letter of credit maintained on a current basis at an amount at least
equal to the market value of the securities loaned. If the Adviser determines to
make securities loans, it is intended that the value of the securities loaned
would not exceed 10% of the value of the net assets of the Series making the
loans.
EMERGING MARKET SECURITIES: Consistent with their respective objectives,
each Series may invest in securities of issuers whose principal activities are
located in emerging market countries. Emerging market countries include any
country determined by the Adviser to have an emerging market economy, taking
into account a number of factors, including whether the country has a low- to
middle- income economy according to the International Bank for Reconstruction
and Development, the country's foreign currency debt rating, its political and
economic stability and the development of its financial and capital markets. The
Adviser determines whether an issuer's principal activities are located in an
emerging market country by considering such factors as its country of
organization, the principal trading market for its securities and the source of
its revenues and assets. The issuer's principal activities generally are deemed
to be located in a particular country if: (a) the security is issued or
guaranteed by the government of that country or any of its agencies, authorities
or instrumentalities; (b) the issuer is organized under the laws of, and
maintains a principal office in that country; (c) the issuer has its principal
securities trading market in that country; (d) the issuer derives 50% or more of
its total revenues from goods sold or services performed in that country; or (e)
the issuer has 50% or more of its assets in that country.
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BRADY BONDS: Each Series may invest in Brady Bonds, which are securities
created through the exchange of existing commercial bank loans to public and
private entities in certain emerging markets for new bonds in connection with
debt restructurings under a debt restructuring plan introduced by former U.S.
Secretary of the Treasury, Nicholas F. Brady (the "Brady Plan"). Brady Plan debt
restructurings have been implemented to date in Argentina, Brazil, Bulgaria,
Costa Rica, Dominican Republic, Ecuador, Jordan, Mexico, Nigeria, Panama, the
Philippines, Poland, Uruguay and Venezuela. Brady Bonds have been issued only
recently, and for that reason do not have a long payment history. Brady Bonds
may be collateralized or uncollateralized, are issued in various currencies (but
primarily the U.S. dollar) and are actively traded in over-the-counter secondary
markets. U.S. dollar-denominated, collateralized Brady Bonds, which may be
fixed-rate bonds or floating-rate bonds, are generally collateralized in full as
to principal by U.S. Treasury zero coupon bonds having the same maturity as the
bonds. Brady Bonds are often viewed as having three or four valuation
components: the collateralized repayment of principal at final maturity; the
collateralized interest payments; the uncollateralized interest payments; and
any uncollateralized repayment of principal at maturity (these uncollateralized
amounts constituting the "residual risk"). In light of the residual risk of
Brady Bonds and the history of defaults of countries issuing Brady Bonds with
respect to commercial bank loans by public and private entities, investments in
Brady Bonds may be viewed as speculative.
REPURCHASE AGREEMENTS: Each Series may enter into repurchase agreements in
order to earn income on available cash or as a temporary defensive measure.
Under a repurchase agreement, a Series acquires securities subject to the
seller's agreement to repurchase at a specified time and price. If the seller
becomes subject to a proceeding under the bankruptcy laws or its assets are
otherwise subject to a stay order, the Series' right to liquidate the securities
may be restricted (during which time the value of the securities could decline).
As discussed in the SAI, each Series has adopted certain procedures intended to
minimize risk.
"WHEN-ISSUED" SECURITIES: Each Series (except the World Governments Series)
may purchase securities on a "when-issued" or on a "forward delivery" basis,
which means that the securities will be delivered to the Series at a future date
usually beyond customary settlement time. The commitment to purchase a security
for which payment will be made on a future date may be deemed a separate
security. In general, a Series does not pay for such securities until received,
and does not start earning interest on the securities until the contractual
settlement date. While awaiting delivery of securities purchased on such bases,
a Series will normally invest in liquid assets.
MORTGAGE "DOLLAR ROLL" TRANSACTIONS: The World Governments Series and the
High Income Series may enter into mortgage "dollar roll" transactions with
selected banks and broker-dealers pursuant to which a Series sells mortgage-
backed securities for delivery in the future (generally within 30 days) and
simultaneously contracts to repurchase substantially similar (same type, coupon
and maturity) securities on a specified future date. The Series record these
transactions as sale and purchase transactions, rather than as borrowing
transactions. A Series will only enter into covered rolls. A "covered roll" is a
specific type of dollar roll for which there is an offsetting cash position or a
cash equivalent security position which matures on or before the forward
settlement date of the dollar roll transaction. In the event that the party with
whom the Series contracts to replace substantially similar securities on a
future date fails to deliver such securities, the Series may not be able to
obtain such securities at the price specified in such contract and thus may not
benefit from the price differential between the current sales price and the
repurchase price.
RESTRICTED SECURITIES: Each Series may purchase securities that are not
registered under the Securities Act of 1933 (the "1933 Act") ("restricted
securities"), including those that can be offered and sold to "qualified
institutional buyers" under Rule 144A under the 1933 Act ("Rule 144A
securities"). A determination is made based upon a continuing review of the
trading markets for a specific Rule 144A security, whether such security is
liquid and thus not subject to the Series' limitation on investing not more than
15% of its net assets in illiquid investments. The Board of Trustees has adopted
guidelines and delegated to MFS the daily function of determining and monitoring
the liquidity of Rule 144A securities. The Board, however, retains oversight,
focusing on factors such as valuation, liquidity and availability of
information. Investing in Rule 144A securities could have the effect of
decreasing the level of liquidity in a Series to the extent that qualified
institutional buyers become for a time uninterested in purchasing Rule 144A
securities held in the Series' portfolio.
CORPORATE ASSET-BACKED SECURITIES: The Emerging Growth Series and the High
Income Series may invest in corporate asset-backed securities. These securities,
issued by trusts and special purpose corporations, are backed by a pool of
assets, such as credit card and automobile loan receivables, representing the
obligations of a number of different parties.
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Corporate asset-backed securities present certain risks. For instance, in
the case of credit card receivables, these securities may not have the benefit
of any security interest in the related collateral. Credit card receivables are
generally unsecured and the debtors are entitled to the protection of a number
of state and federal consumer credit laws, many of which give such debtors the
right to set off certain amounts owed on the credit cards, thereby reducing the
balance due. Most issuers of automobile receivables permit the servicers to
retain possession of the underlying obligations. If the servicer were to sell
these obligations to another party, there is a risk that the purchaser would
acquire an interest superior to that of the holders of the related automobile
receivables. In addition, because of the large number of vehicles involved in a
typical issuance and technical requirements under state laws, the trustee for
the holders of the automobile receivables may not have a proper security
interest in all of the obligations backing such receivables. Therefore, there is
the possibility that recoveries on repossessed collateral may not, in some
cases, be available to support payments on these securities. The underlying
assets (E.G., loans) are also subject to prepayments which shorten the
securities' weighted average life and may lower their return.
Corporate asset-backed securities are often backed by a pool of assets
representing the obligations of a number of different parties. To lessen the
effect of failures by obligors on underlying assets to make payments, the
securities may contain elements of credit support which fall into two
categories: (i) liquidity protection; and (ii) protection against losses
resulting from ultimate default by an obligor on the underlying assets.
Liquidity protection refers to the provision of advances, generally by the
entity administering the pool of assets, to ensure that the receipt of payments
on the underlying pool occurs in a timely fashion. Protection against losses
resulting from ultimate default ensures payment through insurance policies or
letters of credit obtained by the issuer or sponsor from third parties. A Series
will not pay any additional or separate fees for credit support. The degree of
credit support provided for each issue is generally based on historical
information respecting the level of credit risk associated with the underlying
assets. Delinquency or loss in excess of that anticipated or failure of the
credit support could adversely affect the return on an investment in such a
security.
ZERO COUPON BONDS, DEFERRED INTEREST BONDS AND PIK BONDS: The World
Governments Series and the High Income Series may invest in zero coupon bonds.
The High Income Series may also invest in deferred interest bonds and PIK bonds.
Zero coupon and deferred interest bonds are debt obligations which are issued or
purchased at a significant discount from face value. The discount approximates
the total amount of interest the bonds will accrue and compound over the period
until maturity or the first interest payment date at a rate of interest
reflecting the market rate of the security at the time of issuance. While zero
coupon bonds do not require the periodic payment of interest, deferred interest
bonds provide for a period of delay before the regular payment of interest
begins. PIK bonds are debt obligations which provide that the issuer thereof
may, at its option, pay interest on such bonds in cash or in the form of
additional debt obligations. Such investments benefit the issuer by mitigating
its need for cash to meet debt service, but also require a higher rate of return
to attract investors who are willing to defer receipt of such cash. Such
investments may experience greater volatility in market value due to changes in
interest rates than debt obligations which make regular payments of interest.
Each Series will accrue income on such investments for tax and accounting
purposes, as required, which is distributable to shareholders and which, because
no cash is received at the time of accrual, may require the liquidation of other
portfolio securities to satisfy the Series' distribution obligations.
COLLATERALIZED MORTGAGE OBLIGATIONS AND MULTICLASS PASS-THROUGH SECURITIES:
Each of the World Governments Series and the High Income Series may invest a
portion of its assets in collateralized mortgage obligations or "CMOs," which
are debt obligations collateralized by mortgage loans or mortgage pass-through
securities. Typically, CMOs are collateralized by certificates issued by GNMA,
the Federal National Mortgage Association ("FNMA") or the Federal Home Loan
Mortgage Corporation ("FHLMC"), but also may be collateralized by whole loans or
private mortgage pass-through securities (such collateral collectively referred
to as "Mortgage Assets"). Each of these Series may also invest a portion of its
assets in multiclass pass-through securities which are interests in a trust
composed of Mortgage Assets. CMOs (which include multiclass pass-through
securities) may be issued by agencies, authorities or instrumentalities of the
U.S. Government or by private originators of, or investors in, mortgage loans,
including savings and loan associations, mortgage banks, commercial banks,
investment banks and special purpose subsidiaries of the foregoing. Payments of
principal of and interest on the Mortgage Assets, and any reinvestment income
thereon, provide the funds to pay debt service on the CMOs or make scheduled
distributions on the multiclass pass-through securities. In a CMO, a series of
bonds or certificates are usually issued in multiple classes with different
maturities. Each class of CMOs, often referred to as a "tranche," is issued at a
specific fixed or floating coupon rate and has a stated maturity or final
distribution date. Principal prepayments on the Mortgage Assets may cause the
CMOs to be retired substantially earlier than their stated
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maturities or final distribution dates, resulting in a loss of all or part of
the premium if any has been paid. Certain classes of CMOs have priority over
others with respect to the receipt of prepayments on the mortgages. Therefore,
depending on the type of CMOs in which a Series invests, the investment may be
subject to a greater or lesser risk of prepayments than other types of
mortgage-related securities.
The World Governments Series and the High Income Series may also invest in
parallel pay CMOs and Planned Amortization Class CMOs ("PAC Bonds"). Parallel
pay CMOs are structured to provide payments of principal on each payment date to
more than one class. PAC Bonds generally require payments of a specified amount
of principal on each payment date. PAC Bonds are always parallel pay CMOs with
the required principal payment on such securities having the highest priority
after interest has been paid to all classes. For a further description of CMOs,
parallel pay CMOs and PAC Bonds and the risks related to transactions therein,
see the SAI.
STRIPPED MORTGAGE-BACKED SECURITIES: Each of the World Governments Series
and the High Income Series may invest a portion of its assets in stripped
mortgage-backed securities ("SMBS"), which are derivative multiclass mortgage
securities usually structured with two classes that receive different
proportions of interest and principal distributions from an underlying pool of
mortgage assets. For a further description of SMBS and the risks related to
transactions therein, see the SAI.
LOAN PARTICIPATIONS AND OTHER DIRECT INDEBTEDNESS: Each of the Emerging
Growth Series and the High Income Series may invest a portion of its assets in
"loan participations" and other direct indebtedness. By purchasing a loan
participation, a Series acquires some or all of the interest of a bank or other
lending institution in a loan to a corporate borrower. Many such loans are
secured, and most impose restrictive covenants which must be met by the
borrower. These loans are made generally to finance internal growth, mergers,
acquisitions, stock repurchases, leveraged buy-outs and other corporate
activities. Such loans may be in default at the time of purchase. A Series may
also purchase other direct indebtedness such as trade or other claims against
companies, which generally represent money owed by the company to a supplier of
goods and services. These claims may also be purchased at a time when the
company is in default. Certain of the loan participations and other direct
indebtedness acquired by a Series may involve revolving credit facilities or
other standby financing commitments which obligate a Series to pay additional
cash on a certain date or on demand.
The highly leveraged nature of many such loans and other direct indebtedness
may make such loans especially vulnerable to adverse changes in economic or
market conditions. Loan participations and other direct indebtedness may not be
in the form of securities or may be subject to restrictions on transfer, and
only limited opportunities may exist to resell such instruments. As a result, a
Series may be unable to sell such investments at an opportune time or may have
to resell them at less than fair market value. For a further discussion of loan
participations, other direct indebtedness and the risks related to transactions
therein, see the SAI.
MORTGAGE PASS-THROUGH SECURITIES: The World Governments Series and the High
Income Series may invest in mortgage pass-through securities. Mortgage
pass-through securities are securities representing interests in "pools" of
mortgage loans. Monthly payments of interest and principal by the individual
borrowers on mortgages are passed through to the holders of the securities (net
of fees paid to the issuer or guarantor of the securities) as the mortgages in
the underlying mortgage pools are paid off. Payment of principal and interest on
some mortgage pass-through securities (but not the market value of the
securities themselves) may be guaranteed by the full faith and credit of the
U.S. Government (in the case of securities guaranteed by GNMA); or guaranteed by
U.S. Government-sponsored corporations (such as FNMA or FHLMC, which are
supported only by the discretionary authority of the U.S. Government to purchase
the agency's obligations). Mortgage pass-through securities may also be issued
by non-governmental issuers (such as commercial banks, savings and loan
institutions, private mortgage insurance companies, mortgage bankers and other
secondary market issuers). See the SAI for a further discussion of these
securities.
INDEXED SECURITIES: The High Income Series and the World Governments Series
may invest in indexed securities whose value is linked to foreign currencies,
interest rates, commodities, indices or other financial indicators. Most indexed
securities are short to intermediate term fixed income securities whose values
at maturity (I.E., principal value) and/or interest rates rise or fall according
to the change in one or more specified underlying instruments. Indexed
securities may be positively or negatively indexed (I.E., their principal value
or interest rates may increase or decrease if the underlying instrument
appreciates), and may have return characteristics similar to direct investments
in the underlying instrument or to one or more options on the underlying
instrument. Indexed securities may be more volatile than the underlying
instrument itself.
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SWAPS AND RELATED TRANSACTIONS: As one way of managing its exposure to
different types of investments, each of the High Income Series and the World
Governments Series may enter into interest rate swaps, currency swaps and other
types of available swap agreements, such as caps, collars and floors. Swaps
involve the exchange by a Series with another party of cash payments based upon
different interest rate indexes, currencies, and other prices or rates, such as
the value of mortgage prepayment rates. For example, in the typical interest
rate swap, a Series might exchange a sequence of cash payments based on a
floating rate index for cash payments based on a fixed rate. Payments made by
both parties to a swap transaction are based on a principal amount determined by
the parties.
The High Income Series and the World Governments Series may also purchase
and sell caps, floors and collars. In a typical cap or floor agreement, one
party agrees to make payments only under specified circumstances, usually in
return for payment of a fee by the counterparty. For example, the purchase of an
interest rate cap entitles the buyer, to the extent that a specified index
exceeds a predetermined interest rate, to receive payments of interest on a
contractually-based principal amount from the counterparty selling such interest
rate cap. The sale of an interest rate floor obligates the seller to make
payments to the extent that a specified interest rate falls below an agreed-upon
level. A collar arrangement combines elements of buying a cap and selling a
floor.
Swap agreements will tend to shift a Series' investment exposure from one
type of investment to another. For example, if a Series agreed to exchange
payments in dollars for payments in foreign currency, in each case based on a
fixed rate, the swap agreement would tend to decrease a Series' exposure to U.S.
interest rates and increase its exposure to foreign currency and interest rates.
Caps and floors have an effect similar to buying or writing options. Depending
on how they are used, swap agreements may increase or decrease the overall
volatility of a Series' investments and its share price and yield.
Swap agreements are sophisticated hedging instruments that typically involve
a small investment of cash relative to the magnitude of risks assumed. As a
result, swaps can be highly volatile and may have a considerable impact on a
Series' performance. Swap agreements are subject to risks related to the
counterparty's ability to perform, and may decline in value if the
counterparty's creditworthiness deteriorates. A Series may also suffer losses if
it is unable to terminate outstanding swap agreements or reduce its exposure
through offsetting transactions.
Swaps, caps, floors and collars are highly specialized activities which
involve certain risks. See the SAI for further information on, and the risks
involved in, these activities.
OPTIONS ON SECURITIES: Each Series may write (sell) covered put and call
options and purchase put and call options on securities. Each Series will write
options on securities for the purpose of increasing its return and/or to protect
the value of its portfolio. In particular, where a Series writes an option that
expires unexercised or is closed out by the Series at a profit, it will retain
the premium paid for the option which will increase its gross income and will
offset in part the reduced value of the portfolio security underlying the
option, or the increased cost of portfolio securities to be acquired. In
contrast, however, if the price of the underlying security moves adversely to
the Series' position, the option may be exercised and the Series will be
required to purchase or sell the underlying security at a disadvantageous price,
which may only be partially offset by the amount of the premium. The Series may
also write combinations of put and call options on the same security, known as
"straddles." Such transactions can generate additional premium income but also
present increased risk.
By writing a call option on a security, a Series limits its opportunity to
profit from any increase in the market value of the underlying security, since
the holder will usually exercise the call option when the market value of the
underlying security exceeds the exercise price of the call. However, the Series
retains the risk of depreciation in value of securities on which it has written
call options.
Each Series may also purchase put or call options in anticipation of market
fluctuations which may adversely affect the value of its portfolio or the prices
of securities that a Series wants to purchase at a later date. In the event that
the expected market fluctuations occur, the Series may be able to offset the
resulting adverse effect on its portfolio, in whole or in part, through the
options purchased. The premium paid for a put or call option plus any
transaction costs will reduce the benefit, if any, realized by the Series upon
exercise or liquidation of the option, and, unless the price of the underlying
security changes sufficiently, the option may expire without value to the
Series.
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In certain instances, the Emerging Growth Series may enter into options on
Treasury securities that are "reset" options or "adjustable strike" options.
These options provide for periodic adjustment of the strike price and may also
provide for the periodic adjustment of the premium during the term of the
option. The SAI contains a further discussion of these investments.
OPTIONS ON STOCK INDICES: The Emerging Growth Series may write (sell)
covered call and put options and purchase call and put options on stock indices.
The Series may write options on stock indices for the purpose of increasing its
gross income and to protect its portfolio against declines in the value of
securities it owns or increases in the value of securities to be acquired. When
the Series writes an option on a stock index, and the value of the index moves
adversely to the holder's position, the option will not be exercised, and the
Series will either close out the option at a profit or allow it to expire
unexercised. The Series will thereby retain the amount of the premium, less
related transaction costs, which will increase its gross income and offset part
of the reduced value of portfolio securities or the increased cost of securities
to be acquired. Such transactions, however, will constitute only partial hedges
against adverse price fluctuations, since any such fluctuations will be offset
only to the extent of the premium received by the Series for the writing of the
option, less related transaction costs. In addition, if the value of an
underlying index moves adversely to the Series' option position, the option may
be exercised, and the Series will experience a loss which may only be partially
offset by the amount of the premium received.
The Emerging Growth Series may also purchase put or call options on stock
indices in order, respectively, to hedge its investments against a decline in
value or to attempt to reduce the risk of missing a market or industry segment
advance. The Series' possible loss in either case will be limited to the premium
paid for the option, plus related transaction costs.
"YIELD CURVE" OPTIONS: The World Governments Series and the High Income
Series may enter into options on the yield "spread," or yield differential,
between two securities, a transaction referred to as a "yield curve" option, for
hedging and non-hedging (an effort to increase current income) purposes. In
contrast to other types of options, a yield curve option is based on the
difference between the yields of designated securities rather than the actual
prices of the individual securities, and is settled through cash payments.
Accordingly, a yield curve option is profitable to the holder if this
differential widens (in the case of a call) or narrows (in the case of a put),
regardless of whether the yields of the underlying securities increase or
decrease. Yield curve options written by a Series will be covered as described
in the SAI. The trading of yield curve options is subject to all the risks
associated with trading other types of options, as discussed below under
"Additional Risk Factors" and in the SAI. In addition, such options present
risks of loss even if the yield on one of the underlying securities remains
constant, if the spread moves in a direction or to an extent which was not
anticipated.
FUTURES CONTRACTS AND OPTIONS ON FUTURES CONTRACTS: The World Governments
Series and the High Income Series may purchase and sell futures contracts on
foreign or domestic fixed income securities or indices of such securities,
including municipal bond indices and any other indices of foreign or domestic
fixed income securities that may become available for trading ("Futures
Contracts"). Each of these Series may also purchase and write options on such
Futures Contracts ("Options on Futures Contracts"). The Emerging Growth Series
may purchase and sell Futures Contracts on stock indices, while the Emerging
Growth Series and the World Governments Series may purchase and sell Futures
Contracts on foreign currencies or indices of foreign currencies. Each of these
Series may also purchase and write Options on such Futures Contracts.
Such transactions will be entered into for hedging purposes or for
non-hedging purposes to the extent permitted by applicable law. Each Series will
incur brokerage fees when it purchases and sells Futures Contracts, and will be
required to maintain margin deposits. In addition, Futures Contracts entail
risks. Although the Adviser believes that use of such Contracts will benefit a
Series, if its investment judgment about the general direction of exchange rates
or the stock market is incorrect, the Series' overall performance may be poorer
than if it had not entered into any such contract and the Series may realize a
loss. A Series will not enter into any Futures Contract if immediately
thereafter the value of securities and other obligations underlying all such
Futures Contracts held by such Series would exceed 50% of the value of its total
assets.
Purchases of Options on Futures Contracts may present less risk in hedging a
Series' portfolio than the purchase or sale of the underlying Futures Contracts
since the potential loss is limited to the amount of the premium plus related
transaction costs, although it may be necessary to exercise the option to
realize any profit, which results in the
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establishment of a futures position. The writing of Options on Futures
Contracts, however, does not present less risk than the trading of Futures
Contracts and will constitute only a partial hedge, up to the amount of the
premium received. In addition, if an option is exercised, a Series may suffer a
loss on the transaction.
Futures Contracts and Options on Futures Contracts that are entered into by
a Series will be traded on U.S. and foreign exchanges.
FORWARD CONTRACTS: Each Series may enter into forward foreign currency
exchange contracts for the purchase or sale of a fixed quantity of a foreign
currency at a future date ("Forward Contracts"). Each of these Series may enter
into Forward Contracts for hedging purposes and (except for the High Income
Series) for non-hedging purposes (I.E., speculative purposes). By entering into
transactions in Forward Contracts for hedging purposes, a Series may be required
to forego the benefits of advantageous changes in exchange rates and, in the
case of Forward Contracts entered into for non-hedging purposes, a Series may
sustain losses which will reduce its gross income. Such transactions, therefore,
could be considered speculative. Forward Contracts are traded over-the-counter
and not on organized commodities or securities exchanges. As a result, Forward
Contracts operate in a manner distinct from exchange-traded instruments, and
their use involves certain risks beyond those associated with transactions in
Futures Contracts or options traded on exchanges. A Series may choose to, or be
required to, receive delivery of the foreign currencies underlying Forward
Contracts it has entered into. Under certain circumstances, such as where the
Adviser believes that the applicable exchange rate is unfavorable at the time
the currencies are received or the Adviser anticipates, for any other reason,
that the exchange rate will improve, the Series may hold such currencies for an
indefinite period of time. A Series may also enter into a Forward Contract on
one currency to hedge against risk of loss arising from fluctuations in the
value of a second currency (referred to as a "cross hedge") if, in the judgment
of the Adviser, a reasonable degree of correlation can be expected between
movements in the values of the two currencies. Each of these Series has
established procedures consistent with statements of the SEC and its staff
regarding the use of Forward Contracts by registered investment companies, which
requires use of segregated assets or "cover" in connection with the purchase and
sale of such contracts.
OPTIONS ON FOREIGN CURRENCIES: Each Series may purchase and write options on
foreign currencies ("Options on Foreign Currencies") for the purpose of
protecting against declines in the dollar value of portfolio securities and
against increases in the dollar cost of securities to be acquired. As in the
case of other types of options, however, the writing of an Option on Foreign
Currency will constitute only a partial hedge, up to the amount of the premium
received, and a Series may be required to purchase or sell foreign currencies at
disadvantageous exchange rates, thereby incurring losses. The purchase of an
Option on Foreign Currency may constitute an effective hedge against
fluctuations in exchange rates although, in the event of rate movements adverse
to a Series' position, it may forfeit the entire amount of the premium paid for
the option plus related transaction costs. A Series may also choose to, or be
required to, receive delivery of the foreign currencies underlying Options on
Foreign Currencies it has entered into. Under certain circumstances, such as
where the Adviser believes that the applicable exchange rate is unfavorable at
the time the currencies are received or the Adviser anticipates, for any other
reason, that the exchange rate will improve, a Series may hold such currencies
for an indefinite period of time.
6. ADDITIONAL RISK FACTORS
OPTIONS, FUTURES CONTRACTS AND FORWARD CONTRACTS: Although certain Series will
enter into transactions in options, Futures Contracts, Options on Futures
Contracts, Forward Contracts and Options on Foreign Currencies for hedging
purposes, such transactions nevertheless involve certain risks. For example, a
lack of correlation between the instrument underlying an option or Futures
Contract and the assets being hedged, or unexpected adverse price movements,
could render a Series' hedging strategy unsuccessful and could result in losses.
Certain Series also may enter into transactions in options, Futures Contracts,
Options on Futures Contracts and Forward Contracts for other than hedging
purposes, which involves greater risk. In particular, such transactions may
result in losses for a Series which are not offset by gains on other portfolio
positions, thereby reducing gross income. In addition, foreign currency markets
may be extremely volatile from time to time. There also can be no assurance that
a liquid secondary market will exist for any contract purchased or sold, and a
Series may be required to maintain a position until exercise or expiration,
which could result in losses. The SAI contains a description of the nature and
trading mechanics of options, Futures Contracts, Options on Futures Contracts,
Forward Contracts and Options on Foreign Currencies, and includes a discussion
of the risks related to transactions therein.
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Transactions in Forward Contracts may be entered into only in the
over-the-counter market. Futures Contracts and Options on Futures Contracts may
be entered into on U.S. exchanges regulated by the Commodity Futures Trading
Commission and on foreign exchanges. In addition, the securities and indexes
underlying options, Futures Contracts and Options on Futures Contracts traded by
the Series will include both domestic and foreign securities.
LOWER RATED BONDS: The Emerging Growth Series and the High Income Series may
invest in fixed income securities rated Baa by Moody's or BBB by S&P or Fitch
and comparable unrated securities. These securities, while normally exhibiting
adequate protection parameters, have speculative characteristics and changes in
economic conditions or other circumstances are more likely to lead to a weakened
capacity to make principal and interest payments than in the case of higher
grade securities.
Each of these Series may also invest in securities rated Ba or lower by
Moody's or BB or lower by S&P or Fitch and comparable unrated securities
(commonly known as "junk bonds") to the extent described above. See Appendix A
to this Prospectus for a description of these ratings. These securities are
considered speculative and, while generally providing greater income than
investments in higher rated securities, will involve greater risk of principal
and income (including the possibility of default or bankruptcy of the issuers of
such securities) and may involve greater volatility of price (especially during
periods of economic uncertainty or change) than securities in the higher rating
categories. However, since yields vary over time, no specific level of income
can ever be assured. These lower rated high yielding fixed income securities
generally tend to reflect economic changes and short-term corporate and industry
developments to a greater extent than higher rated securities which react
primarily to fluctuations in the general level of interest rates (although these
lower rated fixed income securities are also affected by changes in interest
rates, the market's perception of their credit quality, and the outlook for
economic growth). In the past, economic downturns or an increase in interest
rates have, under certain circumstances, caused a higher incidence of default by
the issuers of these securities and may do so in the future, especially in the
case of highly leveraged issuers. During certain periods, the higher yields on a
Series' lower rated high yielding fixed income securities are paid primarily
because of the increased risk of loss of principal and income, arising from such
factors as the heightened possibility of default or bankruptcy of the issuers of
such securities. Due to the fixed income payments of these securities, a Series
may continue to earn the same level of interest income while its net asset value
declines due to portfolio losses, which could result in an increase in the
Series' yield despite the actual loss of principal. The market for these lower
rated fixed income securities may be less liquid than the market for investment
grade fixed income securities, and judgment may at times play a greater role in
valuing these securities than in the case of investment grade fixed income
securities. Changes in the value of securities subsequent to their acquisition
will not affect cash income or yield to maturity to a Series but will be
reflected in the net asset value of shares of the Series. See the SAI for more
information on lower rated securities.
FOREIGN SECURITIES: Each Series may invest in dollar-denominated and
non-dollar-denominated foreign securities. Investing in securities of foreign
issuers generally involves risks not ordinarily associated with investing in
securities of domestic issuers. These include changes in currency rates,
exchange control regulations, governmental administration or economic or
monetary policy (in the U.S. or abroad) or circumstances in dealings between
nations. Costs may be incurred in connection with conversions between various
currencies. Special considerations may also include more limited information
about foreign issuers, higher brokerage costs, different accounting standards
and thinner trading markets. Foreign securities markets may also be less liquid,
more volatile and less subject to government supervision than in the United
States. Investments in foreign countries could be affected by other factors
including expropriation, confiscatory taxation and potential difficulties in
enforcing contractual obligations and could be subject to extended settlement
periods. Each Series may hold foreign currency received in connection with
investments in foreign securities when, in the judgment of the Adviser, it would
be beneficial to convert such currency into U.S. dollars at a later date, based
on anticipated changes in the relevant exchange rate. Such Series may also hold
foreign currency in anticipation of purchasing foreign securities. See the SAI
for further discussion of foreign securities and the holding of foreign
currency, as well as the associated risks.
AMERICAN DEPOSITARY RECEIPTS: Each Series may invest in ADRs which are
certificates issued by a U.S. depository (usually a bank) and represent a
specified quantity of shares of an underlying non-U.S. stock on deposit with a
custodian bank as collateral. Because ADRs trade on U.S. securities exchanges,
the Adviser does not treat them as foreign securities. However, they are subject
to many of the risks of foreign securities such as changes in exchange rates and
more limited information about foreign issuers.
17
<PAGE>
EMERGING MARKET SECURITIES: Each Series may invest in emerging markets. In
addition to the general risks of investing in foreign securities, investments in
emerging markets involve special risks. Securities of many issuers in emerging
markets may be less liquid and more volatile than securities of comparable
domestic issuers. These securities may be considered speculative and, while
generally offering higher income and the potential for capital appreciation, may
present significantly greater risk. Emerging markets may have different
clearance and settlement procedures, and in certain markets there have been
times when settlements have been unable to keep pace with the volume of
securities transactions, making it difficult to conduct such transactions.
Delays in settlement could result in temporary periods when a portion of the
assets of a Series is uninvested and no return is earned thereon. The inability
of a Series to make intended security purchases due to settlement problems could
cause a Series to miss attractive investment opportunities. Inability to dispose
of portfolio securities due to settlement problems could result in losses to a
Series due to subsequent declines in value of the portfolio securities, a
decrease in the level of liquidity in a Series' portfolio, or if a Series has
entered into a contract to sell the security, possible liability to the
purchaser. Certain markets may require payment for securities before delivery,
and in such markets a Series bears the risk that the securities will not be
delivered and that the Series' payments will not be returned. Securities prices
in emerging markets can be significantly more volatile than in the more
developed nations of the world, reflecting the greater uncertainties of
investing in less established markets and economies. In particular, countries
with emerging markets may have relatively unstable governments, present the risk
of nationalization of businesses, restrictions on foreign ownership, or
prohibitions of repatriation of assets, and may have less protection of property
rights than more developed countries. The economies of countries with emerging
markets may be predominantly based on only a few industries, may be highly
vulnerable to changes in local or global trade conditions, and may suffer from
extreme and volatile debt burdens or inflation rates. Local securities markets
may trade a small number of securities and may be unable to respond effectively
to increases in trading volume, potentially making prompt liquidation of
substantial holdings difficult or impossible at times. Securities of issuers
located in countries with emerging markets may have limited marketability and
may be subject to more abrupt or erratic movements.
Certain emerging markets may require governmental approval for the
repatriation of investment income, capital or the proceeds of sales of
securities by foreign investors. In addition, if a deterioration occurs in an
emerging market's balance of payments or for other reasons, a country could
impose temporary restrictions on foreign capital remittances. A Series could be
adversely affected by delays in, or a refusal to grant, any required
governmental approval for repatriation of capital, as well as by the application
to the Series of any restrictions on investments.
Investment in certain foreign emerging market debt obligations may be
restricted or controlled to varying degrees. These restrictions or controls may
at times preclude investment in certain foreign emerging market debt obligations
and increase the expenses of a Series.
NON-DIVERSIFICATION: The World Governments Series is "non-diversified," as
that term is defined in the Investment Company Act of 1940 ( the "1940 Act"),
but intends to qualify as a "regulated investment company" ("RIC") for federal
income tax purposes. This means, in general, that although more than 5% of the
Series' total assets may be invested in the securities of one issuer (including
a foreign government), at the close of each quarter of its taxable year the
aggregate amount of such holdings may not exceed 50% of the value of its total
assets, and no more than 25% of the value of its total assets may be invested in
the securities of a single issuer. To the extent that a non-diversified Series
at times may hold the securities of a smaller number of issuers than if it were
"diversified" (as defined in the 1940 Act), the Series will at such times be
subject to greater risk with respect to its portfolio securities than a fund
that invests in a broader range of securities, because changes in the financial
condition or market assessment of a single issuer may cause greater fluctuations
in the Series' total return and the net asset value of its shares.
-------------------
SHORT-TERM INVESTMENTS FOR TEMPORARY DEFENSIVE PURPOSES -- During periods of
unusual market conditions when the Adviser believes that investing for temporary
defensive purposes is appropriate, or in order to meet anticipated redemption
requests, a large portion or all of the assets of each Series may be invested in
cash (including foreign currency) or cash equivalents including, but not limited
to, obligations of banks (including certificates of deposit, bankers'
acceptances, time deposits and repurchase agreements), commercial paper,
short-term notes, U.S. Government Securities and related repurchase agreements.
18
<PAGE>
PORTFOLIO TRADING
Each Series intends to manage its portfolio by buying and selling
securities, as well as holding securities to maturity, to help attain its
investment objectives and policies.
Each Series will engage in portfolio trading if it believes a transaction,
net of costs (including custodian charges), will help in attaining its
investment objectives. In trading portfolio securities, a Series seeks to take
advantage of market developments, yield disparities and variations in the
creditworthiness of issuers. For a description of the strategies which may be
used by the Series in trading portfolio securities, see "Portfolio Transactions
and Brokerage Commissions" in the SAI.
Because each of the High Income Series and the World Governments Series is
expected to have a portfolio turnover rate of over 100%, transaction costs
incurred by the Series and the realized capital gains and losses of the Series
may be greater than that of a fund with a lesser portfolio turnover rate.
The primary consideration in placing portfolio security transactions with
broker-dealers for execution is to obtain, and maintain the availability of,
execution at the most favorable prices and in the most effective manner
possible. Consistent with the foregoing primary consideration, the Rules of Fair
Practice of the National Association of Securities Dealers, Inc. (the "NASD")
and such other policies as the Trustees of the Trust may determine, the Adviser
may consider sales of Contracts for which the Trust is an investment option,
together with sales of shares of other investment company clients of MFS Fund
Distributors, Inc., the distributor of shares of the Trust and of the MFS Family
of Funds, as a factor in the selection of broker-dealers to execute each Series'
portfolio transactions. From time to time the Adviser may direct certain
portfolio transactions to broker-dealer firms which, in turn, have agreed to pay
a portion of the Series' operating expenses (e.g., fees charged by the custodian
of the Series' assets). For a further discussion of portfolio trading, see the
SAI.
-------------------
The SAI includes a discussion of other investment policies and listing of
specific investment restrictions which govern the investment policies of each
Series. The specific investment restrictions listed in the SAI may be changed
without shareholder approval unless indicated otherwise (see the SAI). The
Series' investment limitations, policies and rating standards are adhered to at
the time of purchase or utilization of assets; a subsequent change in
circumstances will not be considered to result in a violation of policy.
7. MANAGEMENT OF THE SERIES
The Trust's Board of Trustees, as part of its overall management
responsibility, oversees various organizations responsible for each Series'
day-to-day management.
INVESTMENT ADVISER -- MFS manages each Series pursuant to an Investment Advisory
Agreement with the Trust on behalf of each Series dated April 14, 1994 (the
"Advisory Agreement"). Under the Advisory Agreement, MFS provides the Series
with overall investment advisory services. Subject to such policies as the
Trustees may determine, MFS makes investment decisions for each Series. For its
services and facilities, MFS receives a management fee, computed and paid
monthly, in an amount equal to the following annual rates of the average daily
net assets of each Series:
<TABLE>
<CAPTION>
PERCENTAGE OF THE
AVERAGE DAILY NET
ASSETS
SERIES OF EACH SERIES
- ------------------------------------------------------------------------------------------ ----------------------
<S> <C>
Emerging Growth Series.................................................................... 0.75%
High Income Series........................................................................ 0.75%
World Governments Series.................................................................. 0.75%
</TABLE>
MFS or its affiliates will pay a fee to Jack White and Co., Inc. equal, on
an annualized basis, to 0.15% of the aggregate net assets of each Series,
attributable to Contracts offered by separate accounts of Fortis Benefits
Insurance Company or their affiliates. Such fees will not be paid by the Series,
their shareholders, or by the Contract holders.
19
<PAGE>
For the fiscal year ended December 31, 1996, MFS received the following
management fees from the Series under the Advisory Agreement and assumed the
following amounts of the Series' expenses (see "Expenses" below);
<TABLE>
<CAPTION>
MANAGEMENT FEE EXPENSES ASSUMED
SERIES PAID TO MFS BY MFS
- ------------------------------------------------------------------------------- -------------- ----------------
<S> <C> <C>
Emerging Growth Series......................................................... $ 314,262 $ 62,962
High Income Series............................................................. 56,169 45,293
World Governments Series....................................................... 126,898 172,556
</TABLE>
The identity and background of the portfolio managers for each Series is set
forth below. Unless indicated otherwise, each portfolio manager has acted in
that capacity since the commencement of investment operations of each Series.
<TABLE>
<CAPTION>
SERIES PORTFOLIO MANAGERS
- ----------------------------- -----------------------------------------------------------------------------------
<S> <C>
Emerging Growth Series John W. Ballen, a Senior Vice President of MFS, has been employed by the Adviser as
a portfolio manager since 1984. Toni Y. Shimura, a Vice President of MFS, has been
employed by the Adviser as a portfolio manager since 1987. Ms. Shimura became a
portfolio manager of the Series on November 30, 1995.
High Income Series Joan S. Batchelder, a Senior Vice President of the Adviser, has been employed by
the Adviser as a portfolio manager since 1984.
World Governments Series Stephen C. Bryant, a Senior Vice President of the Adviser, has been employed by the
Adviser as a portfolio manager since 1987.
</TABLE>
MFS also serves as investment adviser to each of the other funds in the MFS
Family of Funds (the "MFS Funds") and to MFS-Registered Trademark- Municipal
Income Trust, MFS Multimarket Income Trust, MFS Government Markets Income Trust,
MFS Intermediate Income Trust, MFS Charter Income Trust, MFS Special Value
Trust, MFS Institutional Trust, MFS Union Standard Trust, MFS/Sun Life Series
Trust, and seven variable accounts, each of which is a registered investment
company established by Sun Life Assurance Company of Canada (U.S.) ("Sun Life of
Canada (U.S.)") in connection with the sale of various fixed/variable annuity
contracts. MFS and its wholly owned subsidiary, MFS Institutional Advisers,
Inc., provide investment advice to substantial private clients.
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 in the United States, Massachusetts Investors
Trust. Net assets under the management of the MFS organization were
approximately $52.8 billion on behalf of approximately 2.3 million investor
accounts as of February 28, 1997. As of such date, the MFS organization managed
approximately $28.9 billion of assets invested in equity securities and
approximately $19.9 billion of assets invested in fixed income securities.
Approximately $4.0 billion of the assets managed by MFS are invested in
securities of foreign issuers and non-U.S. dollar-denominated securities of U.S.
issuers. MFS is a subsidiary of Sun Life of Canada (U.S.), which in turn is a
wholly owned subsidiary of Sun Life Assurance Company of Canada ("Sun Life").
The Directors of MFS are A. Keith Brodkin, Jeffrey L. Shames, Arnold D. Scott,
John D. McNeil and Donald A. Stewart. Mr. Brodkin is the Chairman, Mr. Shames is
the President and Mr. Scott is the Secretary and a Senior Executive Vice
President of MFS. Messrs. McNeil and Stewart are the Chairman and President,
respectively, of Sun Life. Sun Life, a mutual life insurance company, is one of
the largest international life insurance companies and has been operating in the
United States since 1895, establishing a headquarters office here in 1973. The
executive officers of MFS report to the Chairman of Sun Life.
A. Keith Brodkin, the Chairman and a Director of MFS, is the Chairman and
President and a Trustee of the Trust. W. Thomas London, Stephen E. Cavan, James
R. Bordewick, Jr., and James O. Yost, all of whom are officers of MFS, are
officers of the Trust.
MFS has established a strategic alliance with Foreign & Colonial Management
Ltd. ("Foreign & Colonial"). Foreign & Colonial is a subsidiary of two of the
world's oldest financial services institutions, the London-based Foreign &
Colonial Investment Trust PLC, which pioneered the idea of investment management
in 1868, and HYPO-BANK (Bayerische Hypotheken-und Weschsel-Bank AG), the oldest
publicly listed bank in Germany, founded in 1835. As part of this alliance, the
portfolio managers and investment analysts of MFS and Foreign & Colonial share
their views on a variety of investment related issues, such as the economy,
securities markets, portfolio securities and their issuers, investment
recommendations, strategies and techniques, risk analysis, trading strategies
and other portfolio management matters. MFS has access to the extensive
international equity investment expertise of Foreign & Colonial, and Foreign &
Colonial has access to the extensive U.S. equity investment expertise of MFS.
MFS and Foreign Colonial each have investment personnel working in each other's
offices in Boston and London, respectively.
20
<PAGE>
In certain instances there may be securities which are suitable for a
Series' portfolio as well as for portfolios of other clients of MFS or clients
of Foreign & Colonial. Some simultaneous transactions are inevitable when
several clients receive investment advice from MFS and Foreign & Colonial,
particularly when the same security is suitable for more than one client. While
in some cases this arrangement could have a detrimental effect on the price or
availability of the security as far as a Series is concerned, in other cases,
however, it may produce increased investment opportunities for the Series.
From time to time, the Adviser may purchase, redeem and exchange shares of
any Series. The purchase by the Adviser of shares of a Series may have the
effect of lowering that Series' expense ratio, while the redemption by the
Adviser of shares of a Series may have the effect of increasing that Series'
expense ratio.
DISTRIBUTOR -- MFS Fund Distributors, Inc. ("MFD"), a wholly owned
subsidiary of MFS, is the distributor of shares of each Series and also serves
as distributor for certain of the other mutual funds managed by MFS.
ADMINISTRATOR -- MFS provides the Series with certain administrative
services pursuant to a Master Administrative Services Agreement dated March 1,
1997. Under this Agreement, MFS provides the Series with certain financial,
legal, compliance, shareholder communications and other administrative services.
As a partial reimbursement for the cost of providing these services, the Series
pays MFS an administrative fee up to 0.015% per annum of the Series' average
daily net assets, provided that the administrative fee is not assessed on a
Series' assets that exceed $3 billion.
SHAREHOLDER SERVICING AGENT -- MFS Service Center, Inc. (the "Shareholder
Servicing Agent"), a wholly owned subsidiary of MFS, performs transfer agency,
certain dividend disbursing agency and other services for each Series.
8. INFORMATION CONCERNING SHARES OF EACH SERIES
PURCHASES AND REDEMPTIONS
The separate accounts of the Participating Insurance Companies place orders
to purchase and redeem shares of each Series based on, among other things, the
amount of premium payments to be invested and surrender and transfer requests to
be effected on that day pursuant to Contracts. Orders received by the Trust are
effected on days on which the Exchange is open for trading. For orders received
by the Trust before the close of regular trading on the Exchange (normally 4
p.m. eastern time), such purchases and redemptions of the shares of each Series
are effected at the respective net asset values per share determined as of the
close of regular trading on the Exchange on that same day. Participating
Insurance Companies shall be the designee of the Trust for receipt of purchase
and redemption orders from Contract holders and receipt by such designee shall
constitute receipt by the Trust; provided that the Trust receives notice of such
order by 9:30 a.m. eastern time on the next following day on which the Exchange
is open for trading. Payment for shares shall be by federal funds transmitted by
wire and must be received by 2:00 p.m. eastern time on the next following day on
which the Exchange is open for trading after the purchase order is received.
Redemption proceeds shall be by federal funds transmitted by wire and shall be
sent by 2:00 p.m. eastern time on the next following day on which the Exchange
is open for trading after the redemption order is received. No fee is charged
the shareholders when they redeem Series shares.
The offering of shares of any Series may be suspended for a period of time
and each Series reserves the right to refuse any specific purchase order.
Purchase orders may be refused if, in the Adviser's opinion, they are of a size
that would disrupt the management of a Series. The Trust may suspend the right
of redemption of shares of any Series and may postpone payment for any period:
(i) during which the Exchange is closed other than customary weekend and holiday
closings or during which trading on the Exchange is restricted; (ii) when the
SEC determines that a state of emergency exists which may make payment or
transfer not reasonably practicable; (iii) as the SEC may by order permit for
the protection of the security holders of the Trust; or (iv) at any time when
the Trust may, under applicable laws, rules and regulations, suspend payment on
the redemption of its shares.
Should any conflict between Contract holders arise which would require that
a substantial amount of net assets be withdrawn from any Series, orderly
portfolio management could be disrupted to the potential detriment of such
Contract.
NET ASSET VALUE
The net asset value per share of each Series is determined each day during
which the Exchange is open for trading. This determination is made once during
each such day as of the close of regular trading on the Exchange by deducting
the amount of the Series' liabilities from the value of the Series' assets and
dividing the difference by the number of shares of
21
<PAGE>
the Series outstanding. Values of assets in a Series' portfolio are determined
on the basis of their market or other fair value, as described in the SAI. All
investments, assets and liabilities are expressed in U.S. dollars based upon
current currency exchange rates.
DISTRIBUTIONS
Substantially all of each Series' net investment income for any calendar
year is declared as dividends and paid to its shareholders as dividends on an
annual basis. In addition, each Series may make one or more distributions during
the calendar year to its shareholders from any long-term capital gains, and may
also make one or more distributions to its shareholders from short-term capital
gains. In determining the net investment income available for distribution, a
Series may rely on projections of its anticipated net investment income (which
may include short-term capital gains from the sales of securities or other
assets, and, if allowed by a Series' investment restrictions, premiums from
options written), over a longer term, rather than its actual net investment
income for the period.
Shareholders of any of the Series may elect to receive dividends and capital
gain distributions in either cash or additional shares.
TAX STATUS
Each Series of the Trust is treated as a separate entity for federal income
tax purposes. In order to minimize the taxes each Series would otherwise be
required to pay, each Series intends to qualify each year as a "regulated
investment company" under Subchapter M of the Internal Revenue Code of 1986, as
amended ("the Code"). Because each Series intends to distribute all of its net
investment income and net capital gains to its shareholders in accordance with
the timing requirements imposed by the Code, it is not expected that any of the
Series will be required to pay entity level federal income or excise taxes.
Shares of the Series are offered only to the Participating Insurance
Companies' separate accounts that fund Contracts. See the applicable Contract
prospectus for a discussion of the federal income tax treatment of (1) the
separate accounts that purchase and hold Series shares and (2) the holders of
the Contracts that are funded through those accounts. In addition to the
diversification requirements of Subchapter M of the Code, each Series also
intends to diversify its assets as required by Code Section 817(h)(1), and the
regulations thereunder. See also "Tax Status" in the SAI.
DESCRIPTION OF SHARES, VOTING RIGHTS AND LIABILITIES
Each Series currently has one class of shares, entitled Shares of Beneficial
Interest (without par value). The Trust has reserved the right to create and
issue additional classes and series of shares, in which case each class of
shares of a series would participate equally in the earnings, dividends and
assets attributable to that class of that particular series. Shareholders are
entitled to one vote for each share held, and shares of each Series are entitled
to vote separately to approve investment advisory agreements or changes in
investment restrictions with respect to that Series, but shares of all Series
vote together in the election of Trustees and selection of accountants.
Additionally, each Series will vote separately on any other matter that affects
solely that Series, but will otherwise vote together with all other Series on
all other matters. The Trust does not intend to hold annual shareholder
meetings. The Declaration of Trust provides that a Trustee may be removed from
office in certain instances. See "Description of Shares, Voting Rights and
Liabilities" in the SAI.
Each share of a Series represents an equal proportionate interest in the
Series with each share, subject to the liabilities of the particular Series.
Shares have no pre-emptive or conversion rights. Shares are fully paid and non-
assessable. Should a Series be liquidated, shareholders are entitled to share
PRO RATA in the net assets available for distribution to shareholders. Shares
will remain on deposit with the Shareholder Servicing Agent and certificates
will not be issued.
The Trust is an entity of the type commonly known as a "Massachusetts
business trust." Under Massachusetts law, shareholders of such a trust may,
under certain circumstances, be held personally liable as partners for its
obligations. However, the risk of a shareholder incurring financial loss on
account of shareholder liability is limited to circumstances in which both
inadequate insurance existed (E.G., fidelity bonding and omission insurance) and
the Trust itself was unable to meet its obligations.
22
<PAGE>
United of Omaha Life Insurance Company, Omaha, NE, owns 75.63% of the High
Income Series' shares and 33.02% of the World Governments Series' shares, and,
therefore, controls such Series; and Century Life of America--Century Variable
Annuity Account, Waverly, IA, owns 45.82% of the World Governments Series'
shares, and, therefore, controls the Series.
PERFORMANCE INFORMATION
Each Series' performance may be quoted in advertising in terms of yield and
total return. Performance is based on historical results and is not intended to
indicate future performance. Performance quoted for a Series includes the effect
of deducting that Series' expenses, but may not include charges and expenses
attributable to any particular insurance product. Excluding these charges from
quotations of a Series' performance has the effect of increasing the performance
quoted. Performance for a Series will vary based on, among other things, changes
in market conditions, the level of interest rates and the level of the Series'
expenses. For further information about the Series' performance for the fiscal
year ended December 31, 1996, please see the Series' Annual Reports. A copy of
these Annual Reports may be obtained without charge by contacting the
Shareholder Servicing Agent (see back cover for address and phone number).
From time to time, quotations of a Series' total return and yield may be
included in advertisements, sales literature or reports to shareholders or
prospective investors. The total return of a Series refers to return assuming an
investment has been held in the Series for one year and for the life of the
Series (the ending date of which will be stated). The total return quotations
may be expressed in terms of average annual or cumulative rates of return for
all periods quoted. Average annual total return refers to the average annual
compound rate of return of an investment in a Series. Cumulative total return
represents the cumulative change in value of an investment in a Series. Both
will assume that all dividends and capital gains distributions were reinvested.
The yield of a Series refers to net investment income generated by a Series over
a specified 30-day (or one month) period. This income is then "annualized." That
is, the amount of income generated by the Series during that 30-day (or one
month) period is assumed to be generated over a 12-month period and is shown as
a percentage of net asset value.
EXPENSES
The Trust pays the compensation of the Trustees who are not officers of MFS
and all expenses of each Series (other than those assumed by MFS) including but
not limited to: governmental fees; interest charges; taxes; membership dues in
the Investment Company Institute allocable to each Series; fees and expenses of
independent auditors, of legal counsel, and of any transfer agent, registrar or
dividend disbursing agent of each Series; expenses of repurchasing and redeeming
shares and servicing shareholder accounts; expenses of preparing, printing and
mailing prospectuses, periodic reports, notices and proxy statements to
shareholders and to governmental officers and commissions; brokerage and other
expenses connected with the execution, recording and settlement of portfolio
security transactions; insurance premiums; fees and expenses of Investors Bank &
Trust Company, the Trust's Custodian, for all services to each Series, including
safekeeping of funds and securities and maintaining required books and accounts;
expenses of calculating the net asset value of shares of each Series; and
expenses of shareholder meetings. Expenses relating to the issuance,
registration and qualification of shares of each Series and the preparation,
printing and mailing of prospectuses are borne by each Series except that the
Distribution Agreement with MFD requires MFD to pay for prospectuses that are to
be used for sales purposes. Expenses of the Trust which are not attributable to
a specific Series are allocated between the Series in a manner believed by
management of the Trust to be fair and equitable.
Subject to termination or revision at the sole discretion of MFS, MFS has
agreed to bear expenses of each of the Series such that the respective Series'
"Other Expenses," which are defined to include all expenses of the Series except
for management fees, do not exceed 0.25% of the average daily net assets of the
Series (the "Maximum Percentage"). The obligation of MFS to bear these expenses
for a Series terminates on the last day of the Series' fiscal year in which its
"Other Expenses" are less than or equal to the Maximum Percentage. The payments
made by MFS on behalf of each Series under this arrangement are subject to
reimbursement by the Series to MFS, which will be accomplished by the payment of
an expense reimbursement fee by the Series to MFS computed and paid monthly at a
percentage of the Series' average daily net assets for its then current fiscal
year, with a limitation that immediately after such payment the Series' "Other
Expenses" will not exceed the Maximum Percentage. This expense reimbursement by
each Series to MFS terminates on the earlier of the date on which payments made
by the Series equal the prior payment of such reimbursable expenses by MFS or
December 31, 2004.
23
<PAGE>
SHAREHOLDER COMMUNICATIONS
Owners of Contracts issued by Participating Insurance Companies for which
shares of one or more Series are the investment vehicle will receive from the
Participating Insurance Companies semi-annual financial statements and audited
year-end financial statements certified by the Trust's independent certified
public accountants. Each report will show the investments owned by the Trust and
the valuations thereof as determined by the Trustees and will provide other
information about the Trust and its operations.
Participating Insurance Companies with inquiries regarding the Trust may
call the Trust's Shareholder Servicing Agent. (See back cover for address and
phone number.)
-------------------
The SAI for the Trust, dated May 1, 1997, as amended or supplemented from
time to time, contains more detailed information about each of the Series,
including information related to: (i) the investment policies and restrictions
of each Series; (ii) the Trustees, officers and investment adviser of the Trust;
(iii) portfolio transactions; (iv) the shares of each Series, including rights
and liabilities of shareholders; (v) the method used to calculate yield and
total rate of return quotations of each Series; (vi) the determination of net
asset value of shares of each Series; and (vii) certain voting rights of
shareholders of each Series.
24
<PAGE>
APPENDIX A
DESCRIPTION OF BOND RATINGS
The ratings of Moody's, S&P and Fitch represent their opinions as to the quality
of various debt instruments. It should be emphasized, however, that ratings are
not absolute standards of quality. Consequently, debt instruments with the same
maturity, coupon and rating may have different yields while debt instruments of
the same maturity and coupon with different ratings may have the same yield.
MOODY'S INVESTORS SERVICE, INC.
AAA: Bonds which are rated Aaa are judged to be of the best quality. They
carry the smallest degree of investment risk and are generally referred to as
"gilt edged." Interest payments are protected by a large or by an exceptionally
stable margin and principal is secure. While the various protective elements are
likely to change, such changes as can be visualized are most unlikely to impair
the fundamentally strong position of such issues.
AA: Bonds which are rated Aa are judged to be of high quality by all
standards. Together with the Aaa group they comprise what are generally known as
high grade bonds. They are rated lower than the best bonds because margins of
protection may not be as large as in Aaa securities or fluctuations of
protective elements may be of greater amplitude or there may be other elements
present which make the long-term risks appear somewhat larger than in Aaa
securities.
A: Bonds which are rated A possess many favorable investment attributes and
are to be considered as upper-medium-grade obligations. Factors giving security
to principal and interest are considered adequate, but elements may be present
which suggest a susceptibility to impairment sometime in the future.
BAA: Bonds which are rated Baa are considered as medium-grade obligations
(I.E., they are neither highly protected nor poorly secured). Interest payments
and principal security appear adequate for the present but certain protective
elements may be lacking or may be characteristically unreliable over any great
length of time. Such bonds lack outstanding investment characteristics and in
fact have speculative characteristics as well.
BA: Bonds which are rated Ba are judged to have speculative elements; their
future cannot be considered as well-assured. Often the protection of interest
and principal payments may be very moderate and thereby not well safeguarded
during both good and bad times over the future. Uncertainty of position
characterizes bonds in this class.
B: Bonds which are rated B generally lack characteristics of the desirable
investment. Assurance of interest and principal payments or of maintenance of
other terms of the contract over any long period of time may be small.
CAA: Bonds which are rated Caa are of poor standing. Such issues may be in
default or there may be present elements of danger with respect to principal or
interest.
CA: Bonds which are rated Ca represent obligations which are speculative in
a high degree. Such issues are often in default or have other marked
shortcomings.
C: Bonds which are rated C are the lowest rated class of bonds and issues so
rated can be regarded as having extremely poor prospects of ever attaining any
real investment standing.
ABSENCE OF RATING: Where no rating has been assigned or where a rating has
been suspended or withdrawn, it may be for reasons unrelated to the quality of
the issue.
Should no rating be assigned, the reason may be one of the following:
1. an application for rating was not received or accepted;
2. the issue or issuer belongs to a group of securities or companies that
are not rated as a matter of policy;
3. there is a lack of essential data pertaining to the issue or issuer; or
4. the issue was privately placed, in which case the rating is not
published in Moody's publications.
Suspension or withdrawal may occur if new and material circumstances arise,
the effects of which preclude satisfactory analysis; if there is no longer
available reasonable up-to-date data to permit a judgment to be formed; if a
bond is called for redemption; or for other reasons.
A-1
<PAGE>
STANDARD & POOR'S RATINGS SERVICES
AAA: Debt rated AAA has the highest rating assigned by S&P. Capacity to pay
interest and repay principal is extremely strong.
AA: Debt rated AA has a very strong capacity to pay interest and repay
principal and differs from the highest rated issues only in small degree.
A: Debt rated A has a strong capacity to pay interest and repay principal,
although it is somewhat more susceptible to the adverse effects of changes in
circumstances and economic conditions than debt in higher-rated categories.
BBB: Debt rated BBB is regarded as having an adequate capacity to pay
interest and repay principal. Whereas it normally exhibits adequate protection
parameters, adverse economic conditions or changing circumstances are more
likely to lead to a weakened capacity to pay interest and repay principal for
debt in this category than in higher-rated categories.
BB: Debt rated BB has less near-term vulnerability to default than other
speculative issues. However, it faces major ongoing uncertainties or exposure to
adverse business, financial, or economic conditions which could lead to
inadequate capacity to meet timely interest and principal payments. The BB
rating category is also used for debt subordinated to senior debt that is
assigned an actual or implied BBB- rating.
B: Debt rated B has a greater vulnerability to default but currently has the
capacity to meet interest payments and principal repayments. Adverse business,
financial or economic conditions will likely impair capacity or willingness to
pay interest and repay principal. The B rating category is also used for debt
subordinated to senior debt that is assigned an actual or implied BB or BB-
rating.
CCC: Debt rated CCC has a currently identifiable vulnerability to default,
and is dependent upon favorable business, financial and economic conditions to
meet timely payment of interest and repayment of principal. In the event of
adverse business, financial, or economic conditions, it is not likely to have
the capacity to pay interest and repay principal. The CCC rating category is
also used for debt subordinated to senior debt that is assigned an actual or
implied B or B- rating.
CC: The rating CC is typically applied to debt subordinated to senior debt
that is assigned an actual or implied CCC rating.
C: The rating C is typically applied to debt subordinated to senior debt
which is assigned an actual or implied CCC- debt rating. The C rating may be
used to cover a situation where a bankruptcy petition has been filed, but debt
service payments are continued.
CI: The rating CI is reserved for income bonds on which no interest is being
paid.
D: Debt rated D is in payment default. The D rating category is used when
interest payments or principal payments are not made on the date due, even if
the applicable grace period has not expired, unless S&P believes that such
payments will be made during such grace period. The D rating also will be used
upon the filing of a bankruptcy petition if debt service payments are
jeopardized.
PLUS (+) OR MINUS (-): The ratings from AA to CCC may be modified by the
addition of a plus or minus sign to show relative standing within the major
rating categories.
NR: Indicates that no public rating has been requested, that there is
insufficient information on which to base a rating, or that S&P does not rate a
particular type of obligation as a matter of policy.
A-1 AND P-1 COMMERCIAL PAPER RATINGS
Description of S&P, Fitch and Moody's highest commercial paper ratings:
The rating "A" is the highest commercial paper rating assigned by S&P and
Fitch, and issues so rated are regarded as having the greatest capacity for
timely payment. Issues in the "A" category are delineated with the numbers 1, 2
and 3 to indicate the relative degree of safety. The A-1 designation indicates
that the degree of safety regarding timely payment is either overwhelming or
very strong. Those A-1 issues determined to possess overwhelming safety
characteristics will be denoted with a plus (+) sign designation.
A-2
<PAGE>
The rating P-1 is the highest commercial paper rating assigned by Moody's.
Issuers rated P-1 have a superior ability for repayment. P-1 repayment capacity
will normally be evidenced by the following characteristics: (1) leading market
positions in well established industries; (2) high rates of return on funds
employed; (3) conservative capitalization structure with moderate reliance on
debt and ample asset protection; (4) broad margins in earnings coverage of fixed
financial charges and high internal cash generation; and (5) well established
access to a range of financial markets and assured sources of alternate
liquidity.
FITCH INVESTORS SERVICE, INC.
AAA: Bonds considered to be investment grade and of the highest credit
quality. The obligor has an exceptionally strong ability to pay interest and
prepay principal, which is unlikely to be affected by reasonably foreseeable
events.
AA: Bonds considered to be investment grade and of very high credit quality.
The obligor's ability to pay interest and repay principal is very strong,
although not quite as strong as bonds rated 'AAA'. Because bonds rated in the
'AAA' and 'AA' categories are not significantly vulnerable to foreseeable future
developments, short-term debt of these issuers is generally rated 'F-1+'.
A: Bonds considered to be investment grade and of very high credit quality.
The obligor's ability to pay interest and repay principal is considered to be
strong, but may be more vulnerable to adverse changes in economic conditions and
circumstances than bonds with higher ratings.
BBB: Bonds considered to be investment grade and of satisfactory credit
quality. The obligor's ability to pay interest and repay principal is considered
to be adequate. Adverse changes in economic conditions and circumstances,
however, are more likely to have adverse impact on these bonds and, therefore,
impair timely payment. The likelihood that the ratings of these bonds will fall
below investment grade is higher than for bonds with higher ratings.
BB: Bonds are considered speculative. The obligor's ability to pay interest
and repay principal may be affected over time by adverse economic changes.
However, business and financial alternatives can be identified which could
assist the obligor in satisfying its debt service requirements.
B: Bonds are considered highly speculative. While bonds in this class are
currently meeting debt service requirements, the probability of continued timely
payment of principal and interest reflects the obligor's limited margin of
safety and the need for reasonable business and economic activity throughout the
life of the issue.
CCC: Bonds have certain identifiable characteristics which, if not remedied,
may lead to default. The ability to meet obligations requires an advantageous
business and economic environment.
CC: Bonds are minimally protected. Default in payment of interest and/or
principal seems probable over time.
C: Bonds are in imminent default in payment of interest of principal.
PLUS(+) MINUS(-): Plus and minus signs are used with a rating symbol to
indicate the relative position of a credit within the rated category. Plus and
minus signs, however, are not used in the 'AAA' category.
NR: indicates that Fitch does not rate the specific issue.
CONDITIONAL: A conditional rating is premised on the successful completion
of a project or the occurrence of a specific event.
SUSPENDED: A rating is suspended when Fitch deems the amount of information
available from the issuer to be inadequate for rating purposes.
WITHDRAWN: A rating will be withdrawn when an issue matures or is called or
refinanced, and, at Fitch's discretion, when an issuer fails to furnish proper
and timely information.
FITCHALERT: Ratings are placed on FitchAlert to notify investors of an
occurrence that is likely to result in a rating change and the likely direction
of such change. These are designated a "Positive," indicating a potential
upgrade, "Negative," for potential downgrade, or "Evolving," where ratings may
be lowered. FitchAlert is relatively short-term and should be resolved within 12
months.
A-3
<PAGE>
DUFF & PHELPS CREDIT RATING CO.
AAA: Bonds considered to be investment grade and of the highest credit
quality. The obligor has an exceptionally strong ability to pay interest and
repay principal, which is unlikely to be affected by reasonably foreseeable
events.
AA: Bonds considered to be investment grade and or very high credit quality.
The obligor's ability to pay interest and repay principal is very strong,
although not quite as strong as bonds rated 'AAA'. Because bonds rated in the
'AAA' and 'AA' categories are not significantly vulnerable to foreseeable future
developments, short-term debt of these issuers is generally rated 'D-1+'.
A: Bonds considered to be investment grade and of high credit quality. The
obligor's ability to pay interest and repay principal is considered to be
strong, but may be more vulnerable to adverse changes in economic conditions and
circumstances than bonds with higher ratings.
BBB: Bonds considered to be investment grade and of satisfactory credit
quality. The obligor's ability to pay interest and repay principal is considered
to be adequate. Adverse changes in economic conditions and circumstances,
however, are more likely to have adverse impact on these bonds, and therefore
impair timely payment. The likelihood that the ratings of these bonds will fall
below investment grade is higher than for bonds with higher ratings.
BB: Bonds are considered speculative. The obligor's ability to pay interest
and repay principal may be affected over time by adverse economic changes.
However, business, and financial alternatives can be identified which could
assist the obligor in satisfying its debt service requirements.
B: Bonds are considered highly speculative. While bonds in this class are
currently meeting debt service requirements, the probability of continued timely
payment of principal and interest reflects the obligor's limited margin of
safety and the need for reasonable business and economic activity throughout the
life of the issue.
CCC: Bonds have certain identifiable characteristics which, if not remedied,
may lead to default. The ability to meet obligations requires an advantageous
business and economic environment.
PLUS (+) OR MINUS (-): Plus and minus signs are used with a rating symbol to
indicate the relative position of a credit within a rating category. Plus and
minus signs, however, are not used in the 'AAA' category.
NR: Indicates that Duff & Phelps does not rate the specific issue.
DUFF & PHELPS SHORT-TERM RATINGS
D-1+: Highest certainty of timely payment. Short-term liquidity, including
internal operation factors and/or access to alternative sources of funds, is
outstanding and safety is just below risk-free U.S. Treasury short-term
obligations.
D-1: Very high certainty of timely payment. Liquidity factors are excellent
and supported by good fundamental protection factors. Risk factors are minor.
D-1-: High certainty of timely payment. Liquidity factors are strong and
supported by good fundamental protection factors. Risk factors are very small.
D-2: Good certainty of timely payment. Liquidity factors and company
fundamentals are sound. Although ongoing funding needs may enlarge total
financing requirements, access to capital markets is good. Risk factors are
small.
D-3: Satisfactory liquidity and other protection factors qualify issues as
to investment grade. Risk factors are larger and subject to more variation.
Nevertheless, timely payment is expected.
D-4: Speculative investment characteristics. Liquidity is not sufficient to
insure against disruption in debt service. Operating factors and market access
may be subject to a high degree of variation.
D-5: Issuer failed to meet scheduled principal and/or interest payments.
A-4
<PAGE>
APPENDIX B
MFS HIGH INCOME SERIES
PORTFOLIO COMPOSITION CHART
FOR FISCAL YEAR ENDED DECEMBER 31, 1996
The table below shows the percentages of the Series' assets at December 31, 1996
invested in bonds assigned to the various rating categories by S&P, Moody's
(provided only for bonds not rated by S&P), Fitch (provided only for bonds not
rated by S&P or Moody's) and Duff & Phelps (provided only for bonds not rated by
S&P, Moody's or Fitch) and in unrated bonds determined by MFS to be of
comparable quality. For split rated bonds, the S&P rating is used. When an S&P
rating is unavailable, secondary sources are selected in the following order:
Moody's, Fitch and Duff & Phelps.
<TABLE>
<CAPTION>
UNRATED BONDS
COMPILED OF COMPARABLE
RATING RATINGS QUALITY TOTAL
- ------------- ----------- -------------- ----------
<S> <C> <C> <C>
AAA/Aaa
AA/Aa
A/A
BBB/Baa
BB/Ba 12.02 12.02
B/B 69.41 3.93 73.34
CCC/Caa 4.49 4.49
CC/Ca
C/C
Default .58 .58
----- ----- -----
TOTAL 86.50 3.93 90.43
</TABLE>
The chart does not necessarily indicate what the composition of the Series'
portfolio will be in subsequent years. Rather, the Series' investment objective,
policies and restrictions indicate the extent to which the Series may purchase
securities in the various categories.
B-1
<PAGE>
INVESTMENT ADVISER
Massachusetts Financial Services Company
500 Boylston Street, Boston, MA 02116
(617) 954-5000
(800) 637-8730
DISTRIBUTOR
MFS Fund Distributors, Inc.
500 Boylston Street, Boston, MA 02116
(617) 954-5000
CUSTODIAN
Investors Bank & Trust Company
89 South Street, Boston, MA 02111
DIVIDEND DISBURSING AGENT
State Street Bank and Trust Company
225 Franklin Street, Boston, MA 02110
SHAREHOLDER SERVICING AGENT
MFS Service Center, Inc.
500 Boylston Street, Boston, MA 02116
Toll free: (800) 343-2829, ext. 3500
MAILING ADDRESS:
P.O. Box 1400, Boston, MA 02104-9985
INDEPENDENT AUDITORS
Deloitte & Touche LLP
125 Summer Street, Boston, MA 02110
------------------------------------
MFS-REGISTERED TRADEMARK- EMERGING
GROWTH SERIES
MFS-REGISTERED TRADEMARK- HIGH
INCOME SERIES
MFS-REGISTERED TRADEMARK- WORLD
GOVERNMENTS SERIES
[LOGO]
PROSPECTUS
MAY 1, 1997
[LOGO]
MFS-REGISTERED TRADEMARK- EMERGING GROWTH SERIES
MFS-REGISTERED TRADEMARK- HIGH INCOME SERIES
MFS-REGISTERED TRADEMARK- WORLD GOVERNMENTS SERIES
500 Boylston Street, Boston, MA 02116
------------------------
