SUNAMERICA SERIES TRUST
497, 1998-12-10
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<PAGE>   1
 
                        ANCHOR ADVISOR VARIABLE ANNUITY
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                            SUNAMERICA SERIES TRUST
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                SUPPLEMENT TO THE PROSPECTUS DATED APRIL 1, 1998
 
The date of the Prospectus is hereby changed to December 10, 1998.
 
The second and third sentences of the first paragraph on Page 1 of the
Prospectus are hereby deleted and replaced with the following:
 
     The Trust consists of 25 Portfolios, each of which has its own investment
     objectives and policies. This Prospectus includes 16 of the 25 Portfolios
     of the Trust.
 
The paragraph under the heading "The Asset Allocation Portfolio" on Page 1 is
hereby deleted and replaced with the following:
 
     The Asset Allocation Portfolio seeks high total return (including income
     and capital gains) consistent with preservation of capital over the
     long-term through a diversified portfolio that may include common stocks
     and other securities having common stock characteristics, bonds and other
     intermediate and long-term fixed income securities and money market
     instruments (debt securities maturing in 397 days or less) in any
     combination.
 
The last sentence of the third paragraph in the second column on Page 1 is
hereby deleted and replaced with the following:
 
     See "Description of Securities and Investment Techniques -- Risk Factors
     Relating to High-Yield, High-Risk Bonds" for a discussion of the risks
     associated with high-yield, high-risk securities.
 
The last paragraph in the second column on the Page 1 is hereby deleted and
replaced with the following:
 
     This prospectus contains information you should know before investing.
     Please read it carefully before you invest and keep it for future
     reference.
 
     Investments in a Portfolio are not bank deposits and are not guaranteed or
     insured by any bank, government entity or the FDIC.
 
The Financial Highlights on Pages 4, 5 and 6 are hereby supplemented as follows:
 
                                        1
<PAGE>   2
 
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                              FINANCIAL HIGHLIGHTS
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The following Financial Highlights for the Portfolios and periods set forth
below, except for the six months ended May 31, 1998 which is unaudited, have
been audited by PricewaterhouseCoopers LLP, the Trust's independent accountants,
whose report on the financial statements containing such information is included
in the Trust's Annual Report to Shareholders. These Financial Highlights* should
be read in conjunction with the financial statements and notes thereto, which
are included in the Statement of Additional Information.
<TABLE>
<CAPTION>
                                                                        DIVIDENDS   DIVIDENDS
                      NET                      NET           TOTAL      DECLARED    FROM NET     NET                   NET
                     ASSET       NET         REALIZED         FROM      FROM NET    REALIZED    ASSET                 ASSETS
                     VALUE     INVEST-     & UNREALIZED     INVEST-      INVEST-     GAIN ON    VALUE                 END OF
                   BEGINNING     MENT     GAIN (LOSS) ON      MENT        MENT       INVEST-    END OF     TOTAL      PERIOD
  PERIOD ENDED     OF PERIOD   INCOME**    INVESTMENTS     OPERATIONS    INCOME       MENTS     PERIOD   RETURN***   (000'S)
- -----------------------------------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------------------------------
<S>                <C>         <C>        <C>              <C>          <C>         <C>         <C>      <C>         <C>
                                                  Cash Management Portfolio
05/31/98#            10.74       0.25           0.01           0.26       (0.68)         --      10.32      2.47      256,449
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                                                  Corporate Bond Portfolio
05/31/98#            11.54       0.39           0.09           0.48       (0.46)         --      11.56      4.18       99,855
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                                                    Global Bond Portfolio
05/31/98#            11.51       0.23           0.37           0.60       (0.79)      (0.22)     11.10      5.39       99,194
- -----------------------------------------------------------------------------------------------------------------------------
                                                  High-Yield Bond Portfolio
05/31/98#            11.82       0.58           0.27           0.85       (0.66)      (0.08)     11.93      7.28      289,830
- -----------------------------------------------------------------------------------------------------------------------------
                                               Worldwide High Income Portfolio
05/31/98#            13.20       0.53           0.33           0.86       (0.61)      (0.74)     12.71      6.33      147,739
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                                                SunAmerica Balanced Portfolio
05/31/98#            13.45       0.14           1.50           1.64       (0.11)      (0.36)     14.62     12.21       79,469
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- -----------------------------------------------------------------------------------------------------------------------------
 
<CAPTION>
 
                                RATIO OF NET
                    RATIO OF     INVESTMENT
                    EXPENSES       INCOME                   AVERAGE
                   TO AVERAGE    TO AVERAGE    PORTFOLIO   COMMISSION
  PERIOD ENDED     NET ASSETS    NET ASSETS    TURNOVER    PER SHARE
- ----------------------------------------------------------------------
<S>                <C>          <C>            <C>         <C>
                               Cash Management Portfolio
05/31/98#             0.62+         5.25+          --           N/A
- ----------------------------------------------------------------------------------
                                Corporate Bond Portfolio
05/31/98#             0.78+         6.75+          12           N/A
- ----------------------------------------------------------------------------------------------
                                 Global Bond Portfolio
05/31/98#             0.84+         4.02+         118           N/A
- ----------------------------------------------------------------------------------------------------------
                               High-Yield Bond Portfolio
05/31/98#             0.69+         9.72+          92           N/A
- ----------------------------------------------------------------------------------------------------------------------
                            Worldwide High Income Portfolio
05/31/98#            1.07+          8.09+          76           N/A
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                             SunAmerica Balanced Portfolio
05/31/98#             0.82+         1.97+          64           N/A
- -----------------------------------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
  * Calculated based upon average shares outstanding
 ** After fee waivers and expense reimbursements by the investment adviser
*** Does not reflect expenses that apply to the separate accounts of Anchor
    National Life Insurance Company and First SunAmerica Life Insurance Company.
    If such expenses had been included, total return would have been lower for
    each period presented.
  + Annualized
 # Unaudited
 
<TABLE>
<CAPTION>
                                                                                   NET
                                                                                INVESTMENT
                                                                    EXPENSES      INCOME
                                                                    --------    ----------
                                                                      1998         1998
    --------------------------------------------------------------------------------------
    <S>                                                             <C>         <C>
    Cash Management Portfolio...................................      0.62%        5.25%
    Corporate Bond Portfolio....................................      0.78         6.75
    Global Bond Portfolio.......................................      0.84         3.10
    High-Yield Bond Portfolio...................................      0.69         9.72
    Worldwide High Income Portfolio.............................      1.07         8.07
    SunAmerica Balanced Portfolio...............................      0.82         1.95
    --------------------------------------------------------------------------------------
    --------------------------------------------------------------------------------------
</TABLE>
 
                                        2
<PAGE>   3
 
The following Financial Highlights for the Portfolios and periods set forth
below, except for the six months ended May 31, 1998 which is unaudited, have
been audited by PricewaterhouseCoopers LLP, the Trust's independent accountants,
whose report on the financial statements containing such information is included
in the Trust's Annual Report to Shareholders. These Financial Highlights* should
be read in conjunction with the financial statements and notes thereto, which
are included in the Statement of Additional Information.
<TABLE>
<CAPTION>
                                                                        DIVIDENDS   DIVIDENDS
                      NET        NET           NET           TOTAL      DECLARED    FROM NET     NET                     NET
                     ASSET     INVEST-       REALIZED         FROM      FROM NET    REALIZED    ASSET                   ASSETS
                     VALUE       MENT      & UNREALIZED     INVEST-      INVEST-     GAIN ON    VALUE                   END OF
                   BEGINNING    INCOME    GAIN (LOSS) ON      MENT        MENT       INVEST-    END OF     TOTAL        PERIOD
  PERIOD ENDED     OF PERIOD   (LOSS)**    INVESTMENTS     OPERATIONS    INCOME       MENTS     PERIOD   RETURN***     (000'S)
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
<S>                <C>         <C>        <C>              <C>          <C>         <C>         <C>      <C>          <C>
                                                   Asset Allocation Portfolio
05/31/98#            16.21       0.24           0.93           1.17       (0.35)      (1.61)     15.42      7.09         671,222
- --------------------------------------------------------------------------------------------------------------------------------
                                                       Utility Portfolio
05/31/98#            12.91       0.20           0.92           1.12       (0.16)      (0.33)     13.54      8.60          42,601
- --------------------------------------------------------------------------------------------------------------------------------
                                                    Growth-Income Portfolio
05/31/98#            20.82       0.09           3.20           3.29       (0.13)      (0.96)     23.02     15.82         832,054
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                                                   Federated Value Portfolio
05/31/98#            13.90       0.09           2.13           2.22       (0.06)      (0.30)     15.76     16.02         107,670
- --------------------------------------------------------------------------------------------------------------------------------
                                                    Venture Value Portfolio
05/31/98#            21.47       0.11           2.06           2.17       (0.12)      (0.68)     22.84     10.10       1,519,053
- --------------------------------------------------------------------------------------------------------------------------------
                                                "Dogs" of Wall Street Portfolio
4/01/98-5/31/98#     10.00       0.03          (0.29)         (0.26)         --          --       9.74     (2.60)         14,025
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
 
<CAPTION>
 
                                RATIO OF NET
                    RATIO OF     INVESTMENT
                    EXPENSES       INCOME                   AVERAGE
                   TO AVERAGE    TO AVERAGE    PORTFOLIO   COMMISSION
  PERIOD ENDED     NET ASSETS    NET ASSETS    TURNOVER    PER SHARE
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
<S>                <C>          <C>            <C>         <C>
                               Asset Allocation Portfolio
05/31/98#             0.64+         2.96+          78           N/A
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                                   Utility Portfolio
05/31/98#             1.05+         2.94+          40           N/A
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                                Growth-Income Portfolio
05/31/98#             0.60+         0.81+          31           N/A
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                               Federated Value Portfolio
05/31/98#             0.84+         1.14+          24           N/A
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                                Venture Value Portfolio
05/31/98#             0.75+         0.96+           7           N/A
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                            "Dogs" of Wall Street Portfolio
4/01/98-5/31/98#      0.85+++       2.23+++        --           N/A
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
  * Calculated based upon average shares outstanding
 ** After fee waivers and expense reimbursements by the investment adviser
*** Does not reflect expenses that apply to the separate accounts of Anchor
    National Life Insurance Company and First Sun America Life Insurance
    Company. If such expenses had been included, total return would have been
    lower for each period presented.
  + Annualized
  ++ During the periods indicated, the investment adviser waived a portion of or
     all fees and assumed a portion of or all expenses for the Portfolios. If
     all fees and expenses had been incurred by the Portfolios, the ratio of
     expenses to average net assets and the ratio of net investment income to
     average net assets would have been as follows:
 # Unaudited
 
<TABLE>
<CAPTION>
                                                                                   NET
                                                                                INVESTMENT
                                                                                  INCOME
                                                                    EXPENSES      (LOSS)
                                                                    --------    ----------
                                                                      1998         1998
    --------------------------------------------------------------------------------------
    <S>                                                             <C>         <C>
    Asset Allocation Portfolio..................................      0.64         2.96
    Utility Portfolio...........................................      1.05         2.94
    Growth-Income Portfolio.....................................      0.60         0.81
    Federated Value Portfolio...................................      0.84         1.14
    Venture Value Portfolio.....................................      0.75         0.96
    "Dogs" of Wall Street Portfolio.............................      1.13         1.95
    --------------------------------------------------------------------------------------
    --------------------------------------------------------------------------------------
</TABLE>
 
                                        3
<PAGE>   4
 
The following Financial Highlights for the Portfolios and periods set forth
below, except for the six months ended May 31, 1998 which is unaudited, have
been audited by PricewaterhouseCoopers LLP, the Trust's independent accountants,
whose report on the financial statements containing such information is included
in the Trust's Annual Report to Shareholders. These Financial Highlights* should
be read in conjunction with the financial statements and notes thereto, which
are included in the Statement of Additional Information.
<TABLE>
<CAPTION>
                                                                        DIVIDENDS   DIVIDENDS
                      NET        NET           NET           TOTAL      DECLARED    FROM NET     NET                     NET
                     ASSET     INVEST-       REALIZED         FROM      FROM NET    REALIZED    ASSET                   ASSETS
                     VALUE       MENT      & UNREALIZED     INVEST-      INVEST-     GAIN ON    VALUE                   END OF
                   BEGINNING    INCOME    GAIN (LOSS) ON      MENT        MENT       INVEST-    END OF     TOTAL        PERIOD
  PERIOD ENDED     OF PERIOD   (LOSS)**    INVESTMENTS     OPERATIONS    INCOME       MENTS     PERIOD   RETURN***     (000'S)
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
<S>                <C>         <C>        <C>              <C>          <C>         <C>         <C>      <C>          <C>
                                                   Alliance Growth Portfolio
05/31/98#            22.56       0.04           5.31           5.35       (0.06)      (2.30)     25.55     23.85       1,029,515
- --------------------------------------------------------------------------------------------------------------------------------
                                                  Aggressive Growth Portfolio
05/31/98#            11.76       0.02           0.29           0.31          --          --      12.07      2.64         112,531
- --------------------------------------------------------------------------------------------------------------------------------
                                                   Global Equities Portfolio
05/31/98#            15.98       0.04           2.85           2.89       (0.19)      (1.36)     17.32     18.21         417,005
- --------------------------------------------------------------------------------------------------------------------------------
                                          International Diversified Equities Portfolio
05/31/98#            11.33       0.08           2.16           2.24       (0.40)      (0.15)     13.02     19.80         320,893
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
 
<CAPTION>
 
                                RATIO OF NET
                    RATIO OF     INVESTMENT
                    EXPENSES       INCOME                   AVERAGE
                   TO AVERAGE    TO AVERAGE    PORTFOLIO   COMMISSION
  PERIOD ENDED     NET ASSETS    NET ASSETS    TURNOVER    PER SHARE
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
<S>                <C>          <C>            <C>         <C>
                               Alliance Growth Portfolio
05/31/98#             0.59+         0.34+          44           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                              Aggressive Growth Portfolio
05/31/98#             0.84+         0.31+         155           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                               Global Equities Portfolio
05/31/98#             0.89+         0.51+          40           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                      International Diversified Equities Portfolio
05/31/98#             1.27+         1.36+          29           N/A
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
  * Calculated based upon average shares outstanding
 ** After fee waivers and expense reimbursements by the investment adviser
*** Does not reflect expenses that apply to the separate accounts of Anchor
    National Life Insurance Company and First SunAmerica Life Insurance Company.
    If such expenses had been included, total return would have been lower for
    each period presented.
  + Annualized
 # Unaudited
 
<TABLE>
<CAPTION>
                                                                                   NET
                                                                                INVESTMENT
                                                                                  INCOME
                                                                    EXPENSES      (LOSS)
                                                                    --------    ----------
                                                                      1998         1998
    --------------------------------------------------------------------------------------
    <S>                                                             <C>         <C>
    Alliance Growth Portfolio...................................      0.59%        0.34%
    Aggressive Growth Portfolio.................................      0.84         0.31
    Global Equities Portfolio...................................      0.89         0.51
    International Diversified Equities Portfolio................      1.27         1.36
    --------------------------------------------------------------------------------------
    --------------------------------------------------------------------------------------
</TABLE>
 
                                        4
<PAGE>   5
 
The second sentence of the first paragraph on Page 7 is hereby deleted and
replaced with the following:
 
     It was established to provide a funding medium for certain annuity
     contracts issued by various separate accounts (the "Accounts") of Anchor
     National Life Insurance Company and First SunAmerica Life Insurance Company
     (collectively referred to as the "Life Companies").
 
The first sentence of the second paragraph on Page 7 is hereby deleted and
replaced with the following:
 
     The Trust issues 25 separate series of shares ("Portfolios"), each of which
     represents a separately managed portfolio of securities with its own
     investment objectives.
 
The third sentence of the second paragraph on Page 7 is hereby deleted and
replaced with the following:
 
     This Prospectus describes 16 of the 25 Portfolios of the Trust which are
     the Cash Management Portfolio, Corporate Bond Portfolio, Global Bond
     Portfolio, High-Yield Bond Portfolio, Worldwide High Income Portfolio,
     SunAmerica Balanced Portfolio, Asset Allocation Portfolio, Utility
     Portfolio, Growth-Income Portfolio, Federated Value Portfolio, Venture
     Value Portfolio, "Dogs" of Wall Street Portfolio, Alliance Growth
     Portfolio, Aggressive Growth Portfolio, Global Equities Portfolio and
     International Diversified Equities Portfolio.
 
The following is hereby inserted as the second sentence of the last paragraph on
Page 7:
 
     Reference to limitations and restrictions on Portfolio investments used
     herein apply at the time of purchase unless otherwise indicated.
 
The second sentence of the first paragraph under the heading "Cash Management
Portfolio" on Page 8 is hereby deleted and replaced with the following:
 
     These securities mature in 397 days or less.
 
The second sentence of the first paragraph under the heading "Asset Allocation
Portfolio" on Page 13 is hereby deleted and replaced with the following:
 
     The Portfolio seeks to achieve its objectives by investing in a diversified
     portfolio that can include common stocks and other securities having common
     stock characteristics, bonds and other intermediate and long-term fixed
     income securities, including mortgage-related and asset-backed securities,
     and money market instruments (debt securities maturing in 397 days or
     less).
 
The second sentence of the second paragraph under the heading "Federated Value
Portfolio" on Page 15 is hereby deleted and replaced with the following:
 
     The fixed income securities in which the Portfolio may invest must be rated
     at least BBB by S&P, Baa by Moody's, or BBB by Fitch.
 
The last sentence of the second paragraph under the heading "Venture Value
Portfolio" on Page 15 is hereby deleted and replaced with the following:
 
     See "Description of Securities and Investment Techniques -- Investment in
     Small Cap Companies."
 
The first sentence of the third paragraph under the heading " 'Dogs' of Wall
Street Portfolio" on Page 16 is hereby deleted and replaced with the following:
 
     The Portfolio invests in the thirty common stocks selected according to the
     methodology described above.
 
The second sentence of the third paragraph under the heading " 'Dogs' of Wall
Street Portfolio" on Page 16 is hereby deleted.
 
The first sentence of the fourth paragraph under the heading " 'Dogs' of Wall
Street Portfolio" on Page 16 is hereby deleted and replaced with the following:
 
     The Portfolio employs a buy and hold strategy over the course of each year,
     which ignores market timing and rejects active management.
 
The fifth paragraph under the heading " 'Dogs' of Wall Street Portfolio" on Page
17 is hereby deleted and replaced with the following:
 
     As the Portfolio's shares are sold during the year, new cash received by
     the Portfolio is first used to the extent necessary to meet redemption
     requests. The balance of any such cash is invested weekly (or more
     frequently as
                                        5
<PAGE>   6
     the Adviser deems necessary) in the thirty stocks selected for the
     Portfolio as of its most recent rebalancing in proportion to the current
     weightings of such stocks in the Portfolio and without any intention to
     rebalance the Portfolio's holdings on an interim basis. To the extent
     redemptions exceed available cash, the Portfolio generally meets redemption
     requests by selling stocks on a pro rata basis (subject to rounding and
     avoidance of odd lots), based on the current weightings of such stocks in
     the Portfolio and without any intention to rebalance the Portfolio's
     holdings on an interim basis.
 
The second sentence of the fourth paragraph under the heading "Corporate Debt
Instruments" on Page 21 is hereby deleted and replaced with the following:
 
     The High-Yield Bond Portfolio may invest in bonds rated as low as Ca by
     Moody's or CC by S&P and may invest no more than 10% of its total net
     assets in bonds rated as low as C by Moody's or D by S&P.
 
The following paragraph is hereby inserted after the paragraph with the heading
"Risk Factors Relating to High-Yield, High-Risk Bonds" on Page 21:
 
     In the case of corporate debt obligations which are convertible into common
     stock, these risks may be present in a greater degree where the principal
     amount of the obligation is greater than the current market value of the
     common stock into which it is convertible.
 
The paragraph under the heading "Short-Term Debt Securities" on Page 23 is
hereby deleted and replaced with the following:
 
     Debt securities maturing within 397 days of the date of purchase include
     (1) commercial bank obligations (certificates of deposit, bankers'
     acceptances (time drafts on a commercial bank where the bank accepts an
     irrevocable obligation to pay at maturity) and documented discount notes
     (corporate promissory discount notes accompanied by a commercial bank
     guarantee to pay at maturity)), (2) savings association obligations
     (certificates of deposit issued by mutual savings banks or savings and loan
     associations), (3) commercial paper (short-term notes with maturities of up
     to 9 months issued by corporations or governmental bodies), (4) corporate
     bonds and notes (corporate obligations that mature, or that may be
     redeemed, in 397 days or less), and (5) adjustable-rate mortgage securities
     backed by GNMA, FNMA, FHLMC and other non-agency issuers. Although certain
     floating or variable rate obligations (securities whose coupon rate changes
     at least annually and generally more frequently) have maturities in excess
     of 397 days, they are also considered short-term debt securities.
 
The second sentence of the paragraph under the heading "Repurchase Agreements"
on Page 24 is hereby deleted and replaced with the following:
 
     The seller must maintain appropriate collateral in a segregated account.
 
The following two paragraphs are hereby inserted before the paragraph with the
heading "Securities Lending" on Page 26:
 
     LOAN PARTICIPATIONS AND OTHER DIRECT INDEBTEDNESS -- The Worldwide High
     Income Portfolio may invest a portion of its assets in "loan
     participations." By purchasing a loan participation, the Portfolio 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. The Portfolio may also purchase
     trade or other claims against companies, which generally represent money
     owed by the company to a supplier of goods or services. These claims may
     also be purchased at a time when the company is in default. Certain of the
     loan participations acquired by the Portfolio may involve credit facilities
     or other standby financing commitments which obligate the Portfolio to pay
     additional cash on a certain date or on demand.
 
     The highly leveraged nature of many such loans may make such loans
     especially vulnerable to adverse changes in economic or market conditions.
     Loan participations and other direct investments 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, the
     Portfolio may be unable to sell such investments at an opportune time or
     may have to resell them at less than fair market value.
 
                                        6
<PAGE>   7
 
The sixth sentence of the second paragraph under the heading "Borrowing and
Other Forms of Leverage" on Page 26 is hereby deleted and replaced with the
following:
 
     The Portfolios will maintain a segregated account of cash or other liquid
     assets securing the borrowing for the benefit of the lenders.
 
The paragraph under the heading "Risks Associated With Investing in Small
Companies" on Page 26 is hereby deleted and replaced with the following:
 
     INVESTMENT IN SMALL CAP COMPANIES -- The SunAmerica Balanced, Venture
     Value, and Aggressive Growth Portfolios and certain other Portfolios may
     invest in small companies having market capitalizations of under $1
     billion. While such companies may realize more substantial growth than
     larger, more established companies, they may also be subject to some
     additional risks. The securities of these small companies may not be
     readily marketable, making it difficult to dispose of shares when
     desirable. A risk of investing in smaller, emerging companies is that they
     often are at an earlier stage of development and therefore have limited
     product lines, market access for such products, financial resources and
     depth in management than larger, more established companies and their
     securities may be subject to more abrupt or erratic market movements than
     securities of larger, more established companies or the market averages in
     general. In addition, certain smaller issuers may face difficulties in
     obtaining the capital necessary to continue in operation and may go into
     bankruptcy, which could result in a complete loss of an investment. Smaller
     companies also may be less significant factors within their industries and
     may have difficulty withstanding competition from larger companies.
 
The following paragraph is hereby inserted before the paragraph with the heading
"Foreign Currency Transactions" on Page 27:
 
     AMERICAN DEPOSITARY RECEIPTS -- Certain of the Portfolios may invest in
     American Depositary Receipts ("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
     Portfolios' Subadvisers do not treat them as foreign securities.
     Nonetheless, they are subject to many of the risks of foreign securities
     such as changes in exchange rates and more limited information about
     foreign issuers.
 
The first sentence of the third paragraph under the heading "Foreign Currency
Transactions" on page 27 is hereby deleted and replaced with the following:
 
     Each Portfolio (other than the Cash Management Portfolio and except as
     described below), may purchase and write put and call options on currencies
     for the purpose of protecting against declines in the U.S. dollar value of
     foreign portfolio securities and against increases in the U.S. dollar cost
     of foreign securities to be acquired.
 
The following paragraph is hereby inserted before the paragraph under the
heading "Options on Securities and Securities Indices" on Page 28:
 
     EURO CONVERSION -- Effective January 1, 1999, several European countries
     will irrevocably fix their existing national currencies to a new single
     European currency unit, the "euro." Certain European investments may be
     subject to additional risks as a result of this conversion. These risks
     include adverse tax and accounting consequences, as well as difficulty in
     processing transactions. The Adviser is aware of such potential problems
     and is coordinating efforts to prevent or alleviate their adverse impact on
     the Portfolios. There can be no assurance that a Portfolio will not suffer
     any adverse consequences as a result of the euro conversion.
 
The following is hereby inserted as the second paragraph under the heading
"Options on Securities and Securities Indices" on Page 28:
 
     All call options written by each Portfolio are covered, which means that
     the Portfolio will own the securities subject to the option so long as the
     option is outstanding or will have an absolute and immediate right to
     acquire such security without additional cash consideration (or for
     additional cash consideration held in a segregated account) upon conversion
     or exchange of other securities held in its portfolio. A call option is
     also covered if the Portfolio holds a call on the same security and in the
     same principal amount as the call written where the exercise price of the
     call held (a) is equal to or less than the exercise price of the call
     written or (b) is greater than the exercise price of the call written if
     the difference is maintained by the Portfolio in liquid assets. A put
     option written by a Portfolio is covered if the Portfolio maintains liquid
     assets with a value equal to the exercise price in a segregated account, or
     else holds a put on the same security and in the same principal amount as
     the
 
                                        7
<PAGE>   8
 
put written where the exercise price of the put held (i) is equal to or greater
than the exercise price of the put written (ii) is less than the exercise price
of the put written if the difference is maintained by the Portfolio in liquid
assets. Put and call options written by a Portfolio may be covered in such other
manner as may be in accordance with the requirements of the exchange on which,
or the counterparty with which, the option is traded, and applicable laws and
regulations.
 
The paragraph under the heading "Federated Investment Counseling" on Page 33 is
hereby deleted and replaced with the following:
 
     Federated Investment Counseling.  The Subadviser for the Corporate Bond,
     Utility and Federated Value Portfolios is Federated, Federated Investors
     Tower, 1001 Liberty Avenue, Pittsburgh, Pennsylvania 15222-3779. Federated
     is a subsidiary of Federated Investors, Inc., a Pennsylvania corporation.
     All of the Class A (voting) stock of Federated Investors, Inc. is owned by
     a trust, the trustees of which are John F. Donahue, Chairman and Director
     of Federated Investors, Inc., Mr. Donahue's wife and Mr. Donahue's son, J.
     Christopher Donahue, President and Director of Federated Investors, Inc.
     Federated, together with other subsidiaries of Federated Investors, Inc.,
     serves as investment adviser to a number of investment companies and
     private accounts. With over $139.5 billion invested across more than 300
     funds under management and/or administration as of December 31, 1997
     Federated Investors, Inc. is one of the largest mutual fund investment
     managers in the U.S.
 
The fifth paragraph under the heading "Federated Investment Counseling" on Page
33 is hereby deleted and replaced with the following:
 
     Michael P. Donnelly and Arthur J. Barry have served as co-portfolio
     managers of the Federated Value Portfolio since October 1997 and October
     1998, respectively. Mr. Donnelly joined Federated Investors, Inc. in 1989
     as an Investment Analyst and has been a Vice President of Federated
     Investors, Inc. since 1994. He served as an Assistant Vice President of an
     affiliate of Federated Investors, Inc. from 1992 to 1994. Mr. Donnelly is a
     Chartered Financial Analyst. Mr. Barry, who has been a Vice President of
     Federated since July 1998 and was an Assistant Vice President from April
     1997 to July 1998, joined an affiliate of Federated in 1994 as an
     Investment Analyst. Mr. Barry is a Chartered Financial Analyst and received
     his M.S.I.A. from Carnegie Mellon University, where he concentrated in
     finance and accounting.
 
The fifth paragraph under the heading "Goldman Sachs Asset
Management-International" on Page 34 is hereby deleted and replaced with the
following:
 
     Greg Gigliotti, Vice President of GSAM, Thomas S. Price, Vice President of
     GSAM, Lawrence S. Sibley, Vice President of GSAM and Karma Wilson, Vice
     President of GSAM serve as co-portfolio managers of the equity portion of
     the Asset Allocation Portfolio. Mr. Gigliotti joined GSAM in 1997. From
     1996 to 1997 he was a Vice President and senior analyst at Franklin Mutual
     Advisors, Inc., the asset management division of Franklin Resources, Inc.
     From 1989 to 1996 he was a Vice President and senior analyst at Heine
     Securities Corporation which was purchased by Franklin Resources, Inc. Mr.
     Price joined GSAM in 1997. From 1996 to 1997 he was a Vice President and
     senior analyst at Franklin Mutual Advisors, Inc., the asset management
     division of Franklin Resources, Inc. From 1993 to 1996 he was a Vice
     President and senior analyst at Heine Securities Corporation which was
     purchased by Franklin Resources, Inc. Mr. Sibley joined GSAM in 1997. From
     1994 to 1997 he headed Institutional Equity Sales at J.P. Morgan Securities
     and from 1987 to 1994, he was a principal of Sanford C. Bernstein & Co. in
     its Institutional Sales Department. Ms. Wilson joined GSAM in 1994. Prior
     to 1994, she was an investment analyst with Bankers Trust Australia Ltd.
     Before 1992 she was employed at Arthur Andersen LLP.
 
The first paragraph under the heading "Morgan Stanley Asset Management, Inc." on
Page 34 is hereby deleted and replaced with the following:
 
     Morgan Stanley Dean Witter Investment Management Inc.  The Subadviser of
     the Worldwide High Income and International Diversified Equities Portfolios
     is MSDW Investment Management, 1221 Avenue of the Americas, New York, New
     York 10020. MSDW Investment Management is a wholly owned subsidiary of
     Morgan Stanley Dean Witter & Co. and provides a broad range of portfolio
     management services to customers in the United States and abroad. As of
     February 28, 1998, MSDW Investment Management, together with its affiliated
     institutional investment management companies, had approximately $154.6
     billion of assets under management (inclusive of assets under fiduciary
     advisory control).
 
                                        8
<PAGE>   9
 
The third, fourth and fifth paragraphs under the heading "Morgan Stanley Asset
Management Inc." on Pages 34 and 35 are hereby deleted and replaced with the
following:
 
     The portion of the annual investment advisory fee received by SAAMCo which
     is paid to MSDW Investment Management with respect to each of the Worldwide
     High Income and International Diversified Equities Portfolios is 0.65% on
     Assets up to $350 million and 0.60% on Assets thereafter. For the fiscal
     year ended November 30, 1997, SAAMCo paid to MSDW Investment Management,
     with respect to the International Diversified Equities Portfolio and
     Worldwide High Income Portfolio, a fee equal to 0.65% of each Portfolio's
     average daily net assets.
 
     Robert Angevine, Thomas L. Bennett, Stephen F. Esser and Abigail L. McKenna
     serve as co-portfolio managers for the Worldwide High Income Portfolio. Mr.
     Angevine has served as a co-portfolio manager since the inception date of
     October 28, 1994, and Mr. Bennett, Mr. Esser and Ms. McKenna have served as
     co-portfolio managers since October, 1998. Mr. Angevine is a principal of
     Morgan Stanley & Co. Incorporated ("Morgan Stanley") and a portfolio
     manager of MSDW Investment Management's high yield investments. He has been
     with the firm since 1988. Mr. Bennett, a Managing Director of Morgan
     Stanley, joined MSDW Investment Management in 1996 and has been a portfolio
     manager with Miller, Anderson and Sherrerd, LLP ("MAS"), an affiliate of
     MSDW Investment Management, since 1984. Mr. Esser, also a Managing Director
     of Morgan Stanley, joined MSDW Investment Management in 1996 and has been a
     portfolio manager with MAS since 1988. Ms. McKenna, a Vice President of
     MSDW Investment Management and Morgan Stanley, joined the firm in 1996. She
     focuses primarily on the trading and management of the emerging markets
     debt portfolios. Prior to joining MSDW Investment Management, she was a
     Senior Portfolio manager at MetLife Investment Management Corp. From 1995
     to 1996 and Limited Partner at Weiss Peck & Greer from 1991 to 1995 where
     she was responsible for the trading and management of Corporate Bond
     Portfolios.
 
     Barton Biggs and Ann Thivierge serve as co-portfolio managers for the
     International Diversified Equities Portfolio. Mr. Biggs has served as a
     co-portfolio manager since the inception date of October 28, 1994 and Ann
     Thivierge has served as a co-portfolio manager since July 1, 1995. Mr.
     Biggs joined Morgan Stanley Dean Witter & Co in 1973 as a General Partner
     and Managing Director. He has been Chairman and a Director of MSDW
     Investment Management and a Managing Director of Morgan Stanley since 1975.
     Ms. Thivierge joined the company in 1986 as an analyst and served as a Vice
     President of MSDW Investment Management from 1992 to 1996. She is currently
     a Principal of MSDW Investment Management.
 
The paragraph under the heading "Independent Accountants" on Page 37 is hereby
deleted and replaced with the following:
 
     PricewaterhouseCoopers LLP has been selected as independent accountants for
     the Trust.
 
                                        9
<PAGE>   10
 
                     POLARIS/POLARIS(II) VARIABLE ANNUITIES
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                            SUNAMERICA SERIES TRUST
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                SUPPLEMENT TO THE PROSPECTUS DATED APRIL 1, 1998
 
The date of the Prospectus is hereby changed to December 10, 1998.
 
The second sentence of the first paragraph on Page 1 of the Prospectus is hereby
deleted and replaced with the following:
 
     The Trust consists of 25 Portfolios, each of which has its own investment
     objectives and policies. This Prospectus includes 22 of the 25 Portfolios
     of the Trust.
 
The paragraph under the heading "The Asset Allocation Portfolio" on Page 1 is
hereby deleted and replaced with the following:
 
     The Asset Allocation Portfolio seeks high total return (including income
     and capital gains) consistent with preservation of capital over the
     long-term through a diversified portfolio that may include common stocks
     and other securities having common stock characteristics, bonds and other
     intermediate and long-term fixed income securities and money market
     instruments (debt securities maturing in 397 days or less) in any
     combination.
 
The last sentence of the third paragraph in the second column on Page 1 is
hereby deleted and replaced with the following:
 
     See "Description of Securities and Investment Techniques -- Risk Factors
     Relating to High-Yield, High-Risk Bonds" for a discussion of the risks
     associated with high-yield, high-risk securities.
 
The last paragraph in the second column on the Page 1 is hereby deleted and
replaced with the following:
 
     This prospectus contains information you should know before investing.
     Please read it carefully before you invest and keep it for future
     reference.
 
     Investments in a Portfolio are not bank deposits and are not guaranteed or
     insured by any bank, government entity or the FDIC.
 
   The Financial Highlights on Pages 4, 5, 6 and 7 are hereby supplemented as
                                    follows:
 
                                        1
<PAGE>   11
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                              FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
The following Financial Highlights for the Portfolios and periods set forth
below, except for the six months ended May 31, 1998 which is unaudited, have
been audited by PricewaterhouseCoopers LLP, the Trust's independent accountants,
whose report on the financial statements containing such information is included
in the Trust's Annual Report to Shareholders. These Financial Highlights* should
be read in conjunction with the financial statements and notes thereto, which
are included in the Statement of Additional Information.
<TABLE>
<CAPTION>
                                                                        DIVIDENDS   DIVIDENDS
                      NET                      NET           TOTAL      DECLARED    FROM NET     NET                   NET
                     ASSET       NET         REALIZED         FROM      FROM NET    REALIZED    ASSET                 ASSETS
                     VALUE     INVEST-     & UNREALIZED     INVEST-      INVEST-     GAIN ON    VALUE                 END OF
                   BEGINNING     MENT     GAIN (LOSS) ON      MENT        MENT       INVEST-    END OF     TOTAL      PERIOD
  PERIOD ENDED     OF PERIOD   INCOME**    INVESTMENTS     OPERATIONS    INCOME       MENTS     PERIOD   RETURN***   (000'S)
- -----------------------------------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------------------------------
<S>                <C>         <C>        <C>              <C>          <C>         <C>         <C>      <C>         <C>
                                                  Cash Management Portfolio
05/31/98#            10.74       0.25           0.01           0.26       (0.68)         --      10.32      2.47      256,449
- -----------------------------------------------------------------------------------------------------------------------------
                                                  Corporate Bond Portfolio
05/31/98#            11.54       0.39           0.09           0.48       (0.46)         --      11.56      4.18       99,855
- -----------------------------------------------------------------------------------------------------------------------------
                                                    Global Bond Portfolio
05/31/98#            11.51       0.23           0.37           0.60       (0.79)      (0.22)     11.10      5.39       99,194
- -----------------------------------------------------------------------------------------------------------------------------
                                                  High-Yield Bond Portfolio
05/31/98#            11.82       0.58           0.27           0.85       (0.66)      (0.08)     11.93      7.28      289,830
- -----------------------------------------------------------------------------------------------------------------------------
                                               Worldwide High Income Portfolio
05/31/98#            13.20       0.53           0.33           0.86       (0.61)      (0.74)     12.71      6.33      147,739
- -----------------------------------------------------------------------------------------------------------------------------
                                                SunAmerica Balanced Portfolio
05/31/98#            13.45       0.14           1.50           1.64       (0.11)      (0.36)     14.62     12.21       79,469
- -----------------------------------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------------------------------
 
<CAPTION>
 
                                RATIO OF NET
                    RATIO OF     INVESTMENT
                    EXPENSES       INCOME                   AVERAGE
                   TO AVERAGE    TO AVERAGE    PORTFOLIO   COMMISSION
  PERIOD ENDED     NET ASSETS    NET ASSETS    TURNOVER    PER SHARE
- ----------------------------------------------------------------------
<S>                <C>          <C>            <C>         <C>
                               Cash Management Portfolio
05/31/98#             0.62+         5.25+          --           N/A
- ----------------------------------------------------------------------------------
                                Corporate Bond Portfolio
05/31/98#             0.78+         6.75+          12           N/A
- ----------------------------------------------------------------------------------------------
                                 Global Bond Portfolio
05/31/98#             0.84+         4.02+         118           N/A
- ----------------------------------------------------------------------------------------------------------
                               High-Yield Bond Portfolio
05/31/98#             0.69+         9.72+          92           N/A
- ----------------------------------------------------------------------------------------------------------------------
                            Worldwide High Income Portfolio
05/31/98#            1.07+          8.09+          76           N/A
- -----------------------------------------------------------------------------------------------------------------------------
                             SunAmerica Balanced Portfolio
05/31/98#             0.82+         1.97+          64           N/A
- -----------------------------------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
  * Calculated based upon average shares outstanding
 ** After fee waivers and expense reimbursements by the investment adviser
*** Does not reflect expenses that apply to the separate accounts of Anchor
    National Life Insurance Company and First SunAmerica Life Insurance Company.
    If such expenses had been included, total return would have been lower for
    each period presented.
  + Annualized
 # Unaudited
 
<TABLE>
<CAPTION>
                                                                                   NET
                                                                                INVESTMENT
                                                                    EXPENSES      INCOME
                                                                    --------    ----------
                                                                      1998         1998
    --------------------------------------------------------------------------------------
    <S>                                                             <C>         <C>
    Cash Management Portfolio...................................      0.62%        5.25%
    Corporate Bond Portfolio....................................      0.78         6.75
    Global Bond Portfolio.......................................      0.84         3.10
    High-Yield Bond Portfolio...................................      0.69         9.72
    Worldwide High Income Portfolio.............................      1.07         8.07
    SunAmerica Balanced Portfolio...............................      0.82         1.95
    --------------------------------------------------------------------------------------
    --------------------------------------------------------------------------------------
</TABLE>
 
                                        2
<PAGE>   12
 
The following Financial Highlights for the Portfolios and periods set forth
below, except for the six months ended May 31, 1998 which is unaudited, have
been audited by PricewaterhouseCoopers LLP, the Trust's independent accountants,
whose report on the financial statements containing such information is included
in the Trust's Annual Report to Shareholders. These Financial Highlights* should
be read in conjunction with the financial statements and notes thereto, which
are included in the Statement of Additional Information.
<TABLE>
<CAPTION>
                                                                        DIVIDENDS   DIVIDENDS
                      NET        NET           NET           TOTAL      DECLARED    FROM NET     NET                     NET
                     ASSET     INVEST-       REALIZED         FROM      FROM NET    REALIZED    ASSET                   ASSETS
                     VALUE       MENT      & UNREALIZED     INVEST-      INVEST-     GAIN ON    VALUE                   END OF
                   BEGINNING    INCOME    GAIN (LOSS) ON      MENT        MENT       INVEST-    END OF     TOTAL        PERIOD
  PERIOD ENDED     OF PERIOD   (LOSS)**    INVESTMENTS     OPERATIONS    INCOME       MENTS     PERIOD   RETURN***     (000'S)
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
<S>                <C>         <C>        <C>              <C>          <C>         <C>         <C>      <C>          <C>
                                         Balanced/Phoenix Investment Counsel Portfolio
05/31/98#            14.75       0.18           1.15           1.33       (0.21)      (1.40)     14.37      9.06         115,048
- --------------------------------------------------------------------------------------------------------------------------------
                                                   Asset Allocation Portfolio
05/31/98#            16.21       0.24           0.93           1.17       (0.35)      (1.61)     15.42      7.09         671,222
- --------------------------------------------------------------------------------------------------------------------------------
                                                       Utility Portfolio
05/31/98#            12.91       0.20           0.92           1.12       (0.16)      (0.33)     13.54      8.60          42,601
- --------------------------------------------------------------------------------------------------------------------------------
                                                    Growth-Income Portfolio
05/31/98#            20.82       0.09           3.20           3.29       (0.13)      (0.96)     23.02     15.82         832,054
- --------------------------------------------------------------------------------------------------------------------------------
                                                   Federated Value Portfolio
05/31/98#            13.90       0.09           2.13           2.22       (0.06)      (0.30)     15.76     16.02         107,670
- --------------------------------------------------------------------------------------------------------------------------------
                                                    Venture Value Portfolio
05/31/98#            21.47       0.11           2.06           2.17       (0.12)      (0.68)     22.84     10.10       1,519,053
- --------------------------------------------------------------------------------------------------------------------------------
                                                "Dogs" of Wall Street Portfolio
4/01/98-5/31/98#     10.00       0.03          (0.29)         (0.26)         --          --       9.74     (2.60)         14,025
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
 
<CAPTION>
 
                                RATIO OF NET
                    RATIO OF     INVESTMENT
                    EXPENSES       INCOME                   AVERAGE
                   TO AVERAGE    TO AVERAGE    PORTFOLIO   COMMISSION
  PERIOD ENDED     NET ASSETS    NET ASSETS    TURNOVER    PER SHARE
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
<S>                <C>          <C>            <C>         <C>
                     Balanced/Phoenix Investment Counsel Portfolio
05/31/98#             0.78+         2.51+          68           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                               Asset Allocation Portfolio
05/31/98#             0.64+         2.96+          78           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                                   Utility Portfolio
05/31/98#             1.05+         2.94+          40           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                                Growth-Income Portfolio
05/31/98#             0.60+         0.81+          31           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                               Federated Value Portfolio
05/31/98#             0.84+         1.14+          24           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                                Venture Value Portfolio
05/31/98#             0.75+         0.96+           7           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                            "Dogs" of Wall Street Portfolio
4/01/98-5/31/98#      0.85+++       2.23+++        --           N/A
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
  * Calculated based upon average shares outstanding
 ** After fee waivers and expense reimbursements by the investment adviser
*** Does not reflect expenses that apply to the separate accounts of Anchor
    National Life Insurance Company and First Sun America Life Insurance
    Company. If such expenses had been included, total return would have been
    lower for each period presented.
  + Annualized
  ++ During the periods indicated, the investment adviser waived a portion of or
     all fees and assumed a portion of or all expenses for the Portfolios. If
     all fees and expenses had been incurred by the Portfolios, the ratio of
     expenses to average net assets and the ratio of net investment income to
     average net assets would have been as follows:
 # Unaudited
 
<TABLE>
<CAPTION>
                                                                                   NET
                                                                                INVESTMENT
                                                                                  INCOME
                                                                    EXPENSES      (LOSS)
                                                                    --------    ----------
                                                                      1998         1998
    --------------------------------------------------------------------------------------
    <S>                                                             <C>         <C>
    Balanced/Phoenix Investment Counsel Portfolio...............      0.78%        2.51%
    Asset Allocation Portfolio..................................      0.64         2.96
    Utility Portfolio...........................................      1.05         2.94
    Growth-Income Portfolio.....................................      0.60         0.81
    Federated Value Portfolio...................................      0.84         1.14
    Venture Value Portfolio.....................................      0.75         0.96
    "Dogs" of Wall Street Portfolio.............................      1.13         1.95
    --------------------------------------------------------------------------------------
    --------------------------------------------------------------------------------------
</TABLE>
 
                                        3
<PAGE>   13
 
The following Financial Highlights for the Portfolios and periods set forth
below, except for the six months ended May 31, 1998 which is unaudited, have
been audited by PricewaterhouseCoopers LLP, the Trust's independent accountants,
whose report on the financial statements containing such information is included
in the Trust's Annual Report to Shareholders. These Financial Highlights* should
be read in conjunction with the financial statements and notes thereto, which
are included in the Statement of Additional Information.
<TABLE>
<CAPTION>
                                                                        DIVIDENDS   DIVIDENDS
                      NET        NET           NET           TOTAL      DECLARED    FROM NET     NET                     NET
                     ASSET     INVEST-       REALIZED         FROM      FROM NET    REALIZED    ASSET                   ASSETS
                     VALUE       MENT      & UNREALIZED     INVEST-      INVEST-     GAIN ON    VALUE                   END OF
                   BEGINNING    INCOME    GAIN (LOSS) ON      MENT        MENT       INVEST-    END OF     TOTAL        PERIOD
  PERIOD ENDED     OF PERIOD   (LOSS)**    INVESTMENTS     OPERATIONS    INCOME       MENTS     PERIOD   RETURN***     (000'S)
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
<S>                <C>         <C>        <C>              <C>          <C>         <C>         <C>      <C>          <C>
                                                   Alliance Growth Portfolio
05/31/98#            22.56       0.04           5.31           5.35       (0.06)      (2.30)     25.55     23.85       1,029,515
- --------------------------------------------------------------------------------------------------------------------------------
                                          Growth/Phoenix Investment Counsel Portfolio
05/31/98#            15.62       0.02           1.94           1.96       (0.12)      (2.76)     14.70     12.68         233,269
- --------------------------------------------------------------------------------------------------------------------------------
                                                    Putnam Growth Portfolio
05/31/98#            19.15       0.01           3.01           3.02       (0.02)      (3.08)     19.07     15.65         320,428
- --------------------------------------------------------------------------------------------------------------------------------
                                                     Real Estate Portfolio
05/31/98#            11.53       0.20          (0.41)         (0.21)      (0.16)      (0.01)     11.15     (1.86)         53,271
- --------------------------------------------------------------------------------------------------------------------------------
                                                  Aggressive Growth Portfolio
05/31/98#            11.76       0.02           0.29           0.31          --          --      12.07      2.64         112,531
- --------------------------------------------------------------------------------------------------------------------------------
                                           International Growth and Income Portfolio
05/31/98#            10.41       0.10           1.91           2.01       (0.03)      (0.06)     12.33     19.46          94,656
- --------------------------------------------------------------------------------------------------------------------------------
                                                   Global Equities Portfolio
05/31/98#            15.98       0.04           2.85           2.89       (0.19)      (1.36)     17.32     18.21         417,005
- --------------------------------------------------------------------------------------------------------------------------------
                                          International Diversified Equities Portfolio
05/31/98#            11.33       0.08           2.16           2.24       (0.40)      (0.15)     13.02     19.80         320,893
- --------------------------------------------------------------------------------------------------------------------------------
                                                   Emerging Markets Portfolio
05/31/98#             8.03       0.03          (0.41)         (0.38)      (0.07)         --       7.58     (4.77)         29,046
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
 
<CAPTION>
 
                                RATIO OF NET
                    RATIO OF     INVESTMENT
                    EXPENSES       INCOME                   AVERAGE
                   TO AVERAGE    TO AVERAGE    PORTFOLIO   COMMISSION
  PERIOD ENDED     NET ASSETS    NET ASSETS    TURNOVER    PER SHARE
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
<S>                <C>          <C>            <C>         <C>
                               Alliance Growth Portfolio
05/31/98#             0.59+         0.34+          44           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                      Growth/Phoenix Investment Counsel Portfolio
05/31/98#             0.70+         0.28+          53           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                                Putnam Growth Portfolio
05/31/98#             0.87+         0.13+          30           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                                 Real Estate Portfolio
05/31/98#             1.01+         3.49+           8           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                              Aggressive Growth Portfolio
05/31/98#             0.84+         0.31+         155           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                       International Growth and Income Portfolio
05/31/98#             1.54+         1.80+          22           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                               Global Equities Portfolio
05/31/98#             0.89+         0.51+          40           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                      International Diversified Equities Portfolio
05/31/98#             1.27+         1.36+          29           N/A
- --------------------------------------------------------------------------------------------------------------------------------
                               Emerging Markets Portfolio
05/31/98#             1.90+         0.67+          33           N/A
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
  * Calculated based upon average shares outstanding
 ** After fee waivers and expense reimbursements by the investment adviser
*** Does not reflect expenses that apply to the separate accounts of Anchor
    National Life Insurance Company and First SunAmerica Life Insurance Company.
    If such expenses had been included, total return would have been lower for
    each period presented.
  + Annualized
 # Unaudited
 
<TABLE>
<CAPTION>
                                                                                   NET
                                                                                INVESTMENT
                                                                                  INCOME
                                                                    EXPENSES      (LOSS)
                                                                    --------    ----------
                                                                      1998         1998
    --------------------------------------------------------------------------------------
    <S>                                                             <C>         <C>
    Alliance Growth Portfolio...................................      0.59%        0.34%
    Growth/Phoenix Investment Counsel Portfolio.................      0.70         0.28
    Putnam Growth Portfolio.....................................      0.87         0.13
    Real Estate Portfolio.......................................      1.01         3.49
    Aggressive Growth Portfolio.................................      0.84         0.31
    International Growth and Income Portfolio...................      1.54         1.80
    Global Equities Portfolio...................................      0.89         0.51
    International Diversified Equities Portfolio................      1.27         1.36
    Emerging Markets Portfolio..................................      1.90         0.67
    --------------------------------------------------------------------------------------
    --------------------------------------------------------------------------------------
</TABLE>
 
                                        4
<PAGE>   14
 
The second sentence of the first paragraph on Page 8 is hereby deleted and
replaced with the following:
 
     It was established to provide a funding medium for certain annuity
     contracts issued by various separate accounts (the "Accounts") of Anchor
     National Life Insurance Company and First SunAmerica Life Insurance Company
     (collectively referred to as the "Life Companies").
 
The first sentence of the second paragraph on Page 8 is hereby deleted and
replaced with the following:
 
     The Trust issues 25 separate series of shares ("Portfolios"), each of which
     represents a separately managed portfolio of securities with its own
     investment objectives.
 
The third sentence of the second paragraph on Page 8 is hereby deleted and
replaced with the following:
 
     This Prospectus describes 22 of the 25 Portfolios of the Trust which are
     the Cash Management Portfolio, Corporate Bond Portfolio, Global Bond
     Portfolio, High-Yield Bond Portfolio, Worldwide High Income Portfolio,
     SunAmerica Balanced Portfolio, Balanced/Phoenix Investment Counsel
     Portfolio, Asset Allocation Portfolio, Utility Portfolio, Growth-Income
     Portfolio, Federated Value Portfolio, Venture Value Portfolio, "Dogs" of
     Wall Street Portfolio, Alliance Growth Portfolio, Growth/Phoenix Investment
     Counsel Portfolio, Putnam Growth Portfolio, Aggressive Growth Portfolio,
     International Growth and Income Portfolio, Real Estate Portfolio, Global
     Equities Portfolio, International Diversified Equities Portfolio and the
     Emerging Markets Portfolio.
 
The following is hereby inserted as the second sentence of the last paragraph on
Page 8:
 
     Reference to limitations and restrictions on Portfolio investments used
     herein apply at the time of purchase unless otherwise indicated.
 
The second sentence of the first paragraph under the heading "Cash Management
Portfolio" on Page 9 is hereby deleted and replaced with the following:
 
     These securities mature in 397 days or less.
 
The second sentence of the first paragraph under the heading "Asset Allocation
Portfolio" on Page 15 is hereby deleted and replaced with the following:
 
     The Portfolio seeks to achieve its objectives by investing in a diversified
     portfolio that can include common stocks and other securities having common
     stock characteristics, bonds and other intermediate and long-term fixed
     income securities, including mortgage-related and asset-backed securities,
     and money market instruments (debt securities maturing in 397 days or
     less).
 
The second sentence of the second paragraph under the heading "Federated Value
Portfolio" on Page 16 is hereby deleted and replaced with the following:
 
     The fixed income securities in which the Portfolio may invest must be rated
     at least BBB by S&P, Baa by Moody's, or BBB by Fitch.
 
The last sentence of the second paragraph under the heading "Venture Value
Portfolio" on Page 17 is hereby deleted and replaced with the following:
 
     See "Description of Securities and Investment Techniques -- Investment in
     Small Cap Companies."
 
The first sentence of the third paragraph under the heading " 'Dogs' of Wall
Street Portfolio" on Page 18 is hereby deleted and replaced with the following:
 
     The Portfolio invests in the thirty common stocks selected according to the
     methodology described above.
 
The second sentence of the third paragraph under the heading " 'Dogs' of Wall
Street Portfolio" on Page 18 is hereby deleted.
 
The first sentence of the fourth paragraph under the heading " 'Dogs' of Wall
Street Portfolio" on Page 18 is hereby deleted and replaced with the following:
 
     The Portfolio employs a buy and hold strategy over the course of each year,
     which ignores market timing and rejects active management.
 
                                        5
<PAGE>   15
 
The fifth paragraph under the heading " 'Dogs' of Wall Street Portfolio" on Page
18 is hereby deleted and replaced with the following:
 
     As the Portfolio's shares are sold during the year, new cash received by
     the Portfolio is first used to the extent necessary to meet redemption
     requests. The balance of any such cash is invested weekly (or more
     frequently as the Adviser deems necessary) in the thirty stocks selected
     for the Portfolio as of its most recent rebalancing in proportion to the
     current weightings of such stocks in the Portfolio and without any
     intention to rebalance the Portfolio's holdings on an interim basis. To the
     extent redemptions exceed available cash, the Portfolio generally meets
     redemption requests by selling stocks on a pro rata basis (subject to
     rounding and avoidance of odd lots), based on the current weightings of
     such stocks in the Portfolio and without any intention to rebalance the
     Portfolio's holdings on an interim basis.
 
The second sentence of the fourth paragraph under the heading "Corporate Debt
Instruments" on Page 24 is hereby deleted and replaced with the following:
 
     The High-Yield Bond Portfolio may invest in bonds rated as low as Ca by
     Moody's or CC by S&P and may invest no more than 10% of its total net
     assets in bonds rated as low as C by Moody's or D by S&P.
 
The following paragraph is hereby inserted after the paragraph with the heading
"Risk Factors Relating to High-Yield, High-Risk Bonds" on Page 25:
 
     In the case of corporate debt obligations which are convertible into common
     stock, these risks may be present in a greater degree where the principal
     amount of the obligation is greater than the current market value of the
     common stock into which it is convertible.
 
The paragraph under the heading "Short-Term Debt Securities" on Page 27 is
hereby deleted and replaced with the following:
 
     Debt securities maturing within 397 days of the date of purchase include
     (1) commercial bank obligations (certificates of deposit, bankers'
     acceptances (time drafts on a commercial bank where the bank accepts an
     irrevocable obligation to pay at maturity) and documented discount notes
     (corporate promissory discount notes accompanied by a commercial bank
     guarantee to pay at maturity)), (2) savings association obligations
     (certificates of deposit issued by mutual savings banks or savings and loan
     associations), (3) commercial paper (short-term notes with maturities of up
     to 9 months issued by corporations or governmental bodies), (4) corporate
     bonds and notes (corporate obligations that mature, or that may be
     redeemed, in 397 days or less), and (5) adjustable-rate mortgage securities
     backed by GNMA, FNMA, FHLMC and other non-agency issuers. Although certain
     floating or variable rate obligations (securities whose coupon rate changes
     at least annually and generally more frequently) have maturities in excess
     of 397 days, they are also considered short-term debt securities.
 
The second sentence of the paragraph under the heading "Repurchase Agreements"
on Page 28 is hereby deleted and replaced with the following:
 
     The seller must maintain appropriate collateral in a segregated account.
 
The following two paragraphs are hereby inserted before the paragraph with the
heading "Securities Lending" on Page 29:
 
     LOAN PARTICIPATIONS AND OTHER DIRECT INDEBTEDNESS -- The Worldwide High
     Income Portfolio may invest a portion of its assets in "loan
     participations." By purchasing a loan participation, the Portfolio 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. The Portfolio may also purchase
     trade or other claims against companies, which generally represent money
     owed by the company to a supplier of goods or services. These claims may
     also be purchased at a time when the company is in default. Certain of the
     loan participations acquired by the Portfolio may involve credit facilities
     or other standby financing commitments which obligate the Portfolio to pay
     additional cash on a certain date or on demand.
 
     The highly leveraged nature of many such loans may make such loans
     especially vulnerable to adverse changes in economic or market conditions.
     Loan participations and other direct investments 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
 
                                        6
<PAGE>   16
 
instruments. As a result, the Portfolio may be unable to sell such investments
at an opportune time or may have to resell them at less than fair market value.
 
The sixth sentence of the second paragraph under the heading "Borrowing and
Other Forms of Leverage" on Page 26 is hereby deleted and replaced with the
following:
 
     The Portfolios will maintain a segregated account of cash or other liquid
     assets securing the borrowing for the benefit of the lenders.
 
The paragraph under the heading "Risks Associated With Investing in Small
Companies" on Page 30 is hereby deleted and replaced with the following:
 
     INVESTMENT IN SMALL CAP COMPANIES -- The SunAmerica Balanced, Venture
     Value, and Aggressive Growth Portfolios and certain other Portfolios may
     invest in small companies having market capitalizations of under $1
     billion. While such companies may realize more substantial growth than
     larger, more established companies, they may also be subject to some
     additional risks. The securities of these small companies may not be
     readily marketable, making it difficult to dispose of shares when
     desirable. A risk of investing in smaller, emerging companies is that they
     often are at an earlier stage of development and therefore have limited
     product lines, market access for such products, financial resources and
     depth in management than larger, more established companies and their
     securities may be subject to more abrupt or erratic market movements than
     securities of larger, more established companies or the market averages in
     general. In addition, certain smaller issuers may face difficulties in
     obtaining the capital necessary to continue in operation and may go into
     bankruptcy, which could result in a complete loss of an investment. Smaller
     companies also may be less significant factors within their industries and
     may have difficulty withstanding competition from larger companies.
 
The following paragraph is hereby inserted before the paragraph with the heading
"Foreign Currency Transactions" on Page 31:
 
     AMERICAN DEPOSITARY RECEIPTS -- Certain of the Portfolios may invest in
     American Depositary Receipts ("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
     Portfolios' Subadvisers do not treat them as foreign securities.
     Nonetheless, they are subject to many of the risks of foreign securities
     such as changes in exchange rates and more limited information about
     foreign issuers.
 
The first sentence of the third paragraph under the heading "Foreign Currency
Transactions" on page 31 is hereby deleted and replaced with the following:
 
     Each Portfolio (other than the Cash Management Portfolio and except as
     described below), may purchase and write put and call options on currencies
     for the purpose of protecting against declines in the U.S. dollar value of
     foreign portfolio securities and against increases in the U.S. dollar cost
     of foreign securities to be acquired.
 
The following paragraph is hereby inserted before the paragraph under the
heading "Options on Securities and Securities Indices" on Page 32:
 
     EURO CONVERSION -- Effective January 1, 1999, several European countries
     will irrevocably fix their existing national currencies to a new single
     European currency unit, the "euro." Certain European investments may be
     subject to additional risks as a result of this conversion. These risks
     include adverse tax and accounting consequences, as well as difficulty in
     processing transactions. The Adviser is aware of such potential problems
     and is coordinating efforts to prevent or alleviate their adverse impact on
     the Portfolios. There can be no assurance that a Portfolio will not suffer
     any adverse consequences as a result of the euro conversion.
 
The following is hereby inserted as the second paragraph under the heading
"Options on Securities and Securities Indices" on Page 32:
 
     All call options written by each Portfolio are covered, which means that
     the Portfolio will own the securities subject to the option so long as the
     option is outstanding or will have an absolute and immediate right to
     acquire such security without additional cash consideration (or for
     additional cash consideration held in a segregated account) upon conversion
     or exchange of other securities held in its portfolio. A call option is
     also covered if the Portfolio holds a call on the same security and in the
     same principal amount as the call written where the exercise price of the
     call held (a) is equal to or less than the exercise price of the call
     written or (b) is greater than the exercise price of the call written if
     the difference is maintained by the Portfolio in liquid assets. A put
 
                                        7
<PAGE>   17
 
option written by a Portfolio is covered if the Portfolio maintains liquid
assets with a value equal to the exercise price in a segregated account, or else
holds a put on the same security and in the same principal amount as the put
written where the exercise price of the put held (i) is equal to or greater than
the exercise price of the put written (ii) is less than the exercise price of
the put written if the difference is maintained by the Portfolio in liquid
assets. Put and call options written by a Portfolio may be covered in such other
manner as may be in accordance with the requirements of the exchange on which,
or the counterparty with which, the option is traded, and applicable laws and
regulations.
 
The paragraph under the heading "Federated Investment Counseling" on Page 37 is
hereby deleted and replaced with the following:
 
     Federated Investment Counseling.  The Subadviser for the Corporate Bond,
     Utility and Federated Value Portfolios is Federated, Federated Investors
     Tower, 1001 Liberty Avenue, Pittsburgh, Pennsylvania 15222-3779. Federated
     is a subsidiary of Federated Investors, Inc., a Pennsylvania corporation.
     All of the Class A (voting) stock of Federated Investors, Inc. is owned by
     a trust, the trustees of which are John F. Donahue, Chairman and Director
     of Federated Investors, Inc., Mr. Donahue's wife and Mr. Donahue's son, J.
     Christopher Donahue, President and Director of Federated Investors, Inc.
     Federated, together with other subsidiaries of Federated Investors, Inc.,
     serves as investment adviser to a number of investment companies and
     private accounts. With over $139.5 billion invested across more than 300
     funds under management and/or administration as of December 31, 1997
     Federated Investors, Inc. is one of the largest mutual fund investment
     managers in the U.S.
 
The fifth paragraph under the heading "Federated Investment Counseling" on Page
37 is hereby deleted and replaced with the following:
 
     Michael P. Donnelly and Arthur J. Barry have served as co-portfolio
     managers of the Federated Value Portfolio since October 1997 and October
     1998, respectively. Mr. Donnelly joined Federated Investors, Inc. in 1989
     as an Investment Analyst and has been a Vice President of Federated
     Investors, Inc. since 1994. He served as an Assistant Vice President of an
     affiliate of Federated Investors, Inc. from 1992 to 1994. Mr. Donnelly is a
     Chartered Financial Analyst. Mr. Barry, who has been a Vice President of
     Federated since July 1998 and was an Assistant Vice President from April
     1997 to July 1998, joined an affiliate of Federated in 1994 as an
     Investment Analyst. Mr. Barry is a Chartered Financial Analyst and received
     his M.S.I.A. from Carnegie Mellon University, where he concentrated in
     finance and accounting.
 
The fifth paragraph under the heading "Goldman Sachs Asset
Management-International" on Page 38 is hereby deleted and replaced with the
following:
 
     Greg Gigliotti, Vice President of GSAM, Thomas S. Price, Vice President of
     GSAM, Lawrence S. Sibley, Vice President of GSAM and Karma Wilson, Vice
     President of GSAM serve as co-portfolio managers of the equity portion of
     the Asset Allocation Portfolio. Mr. Gigliotti joined GSAM in 1997. From
     1996 to 1997 he was a Vice President and senior analyst at Franklin Mutual
     Advisors, Inc., the asset management division of Franklin Resources, Inc.
     From 1989 to 1996 he was a Vice President and senior analyst at Heine
     Securities Corporation which was purchased by Franklin Resources, Inc. Mr.
     Price joined GSAM in 1997. From 1996 to 1997 he was a Vice President and
     senior analyst at Franklin Mutual Advisors, Inc., the asset management
     division of Franklin Resources, Inc. From 1993 to 1996 he was a Vice
     President and senior analyst at Heine Securities Corporation which was
     purchased by Franklin Resources, Inc. Mr. Sibley joined GSAM in 1997. From
     1994 to 1997 he headed Institutional Equity Sales at J.P. Morgan Securities
     and from 1987 to 1994, he was a principal of Sanford C. Bernstein & Co. in
     its Institutional Sales Department. Ms. Wilson joined GSAM in 1994. Prior
     to 1994, she was an investment analyst with Bankers Trust Australia Ltd.
     Before 1992 she was employed at Arthur Andersen LLP.
 
The first paragraph under the heading "Morgan Stanley Asset Management, Inc." on
Page 38 is hereby deleted and replaced with the following:
 
     Morgan Stanley Dean Witter Investment Management Inc.  The Subadviser of
     the Worldwide High Income and International Diversified Equities Portfolios
     is MSDW Investment Management, 1221 Avenue of the Americas, New York, New
     York 10020. MSDW Investment Management is a wholly owned subsidiary of
     Morgan Stanley Dean Witter & Co. and provides a broad range of portfolio
     management services to customers in the United States and abroad. As of
     February 28, 1998, MSDW Investment Management, together with its affiliated
 
                                        8
<PAGE>   18
 
institutional investment management companies, had approximately $154.6 billion
of assets under management (inclusive of assets under fiduciary advisory
control).
 
The third, fourth and fifth paragraphs under the heading "Morgan Stanley Asset
Management Inc." on Pages 38 and 39 are hereby deleted and replaced with the
following:
 
     The portion of the annual investment advisory fee received by SAAMCo which
     is paid to MSDW Investment Management with respect to each of the Worldwide
     High Income and International Diversified Equities Portfolios is 0.65% on
     Assets up to $350 million and 0.60% on Assets thereafter. For the fiscal
     year ended November 30, 1997, SAAMCo paid to MSDW Investment Management,
     with respect to the International Diversified Equities Portfolio and
     Worldwide High Income Portfolio, a fee equal to 0.65% of each Portfolio's
     average daily net assets.
 
     Robert Angevine, Thomas L. Bennett, Stephen F. Esser and Abigail L. McKenna
     serve as co-portfolio managers for the Worldwide High Income Portfolio. Mr.
     Angevine has served as a co-portfolio manager since the inception date of
     October 28, 1994, and Mr. Bennett, Mr. Esser and Ms. McKenna have served as
     co-portfolio managers since October, 1998. Mr. Angevine is a principal of
     Morgan Stanley & Co. Incorporated ("Morgan Stanley") and a portfolio
     manager of MSDW Investment Management's high yield investments. He has been
     with the firm since 1988. Mr. Bennett, a Managing Director of Morgan
     Stanley, joined MSDW Investment Management in 1996 and has been a portfolio
     manager with Miller, Anderson and Sherrerd, LLP ("MAS"), an affiliate of
     MSDW Investment Management, since 1984. Mr. Esser, also a Managing Director
     of Morgan Stanley, joined MSDW Investment Management in 1996 and has been a
     portfolio manager with MAS since 1988. Ms. McKenna, a Vice President of
     MSDW Investment Management and Morgan Stanley, joined the firm in 1996. She
     focuses primarily on the trading and management of the emerging markets
     debt portfolios. Prior to joining MSDW Investment Management, she was a
     Senior Portfolio manager at MetLife Investment Management Corp. From 1995
     to 1996 and Limited Partner at Weiss Peck & Greer from 1991 to 1995 where
     she was responsible for the trading and management of Corporate Bond
     Portfolios.
 
     Barton Biggs and Ann Thivierge serve as co-portfolio managers for the
     International Diversified Equities Portfolio. Mr. Biggs has served as a
     co-portfolio manager since the inception date of October 28, 1994 and Ann
     Thivierge has served as a co-portfolio manager since July 1, 1995. Mr.
     Biggs joined Morgan Stanley Dean Witter & Co in 1973 as a General Partner
     and Managing Director. He has been Chairman and a Director of MSDW
     Investment Management and a Managing Director of Morgan Stanley since 1975.
     Ms. Thivierge joined the company in 1986 as an analyst and served as a Vice
     President of MSDW Investment Management from 1992 to 1996. She is currently
     a Principal of MSDW Investment Management.
 
The paragraph under the heading "Independent Accountants" on Page 43 is hereby
deleted and replaced with the following:
 
     PricewaterhouseCoopers LLP has been selected as independent accountants for
     the Trust.
 
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