AG SERIES TRUST
497, 1999-05-04
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<PAGE>   1
 
                               A.G. SERIES TRUST
 
                                   PROSPECTUS
 
                             ---------------------
 
                               GROWTH PORTFOLIOS
 
                  CREDIT SUISSE INTERNATIONAL EQUITY PORTFOLIO
                       ("INTERNATIONAL EQUITY PORTFOLIO")
 
                              ELITEVALUE PORTFOLIO
 
              STATE STREET GLOBAL ADVISORS GROWTH EQUITY PORTFOLIO
                          ("GROWTH EQUITY PORTFOLIO")
 
                      VAN KAMPEN EMERGING GROWTH PORTFOLIO
                         ("EMERGING GROWTH PORTFOLIO")
 
                             ---------------------
 
                          GROWTH AND INCOME PORTFOLIO
 
                   CREDIT SUISSE GROWTH AND INCOME PORTFOLIO
                        ("GROWTH AND INCOME PORTFOLIO")
 
                             ---------------------
 
                               INCOME PORTFOLIOS
 
             AMERICAN GENERAL U.S. GOVERNMENT SECURITIES PORTFOLIO
                    ("U.S. GOVERNMENT SECURITIES PORTFOLIO")
 
              STATE STREET GLOBAL ADVISORS MONEY MARKET PORTFOLIO
                           ("MONEY MARKET PORTFOLIO")
 
THE SECURITIES AND EXCHANGE COMMISSION HAS NOT APPROVED OR DISAPPROVED THESE
SECURITIES NOR HAS IT DETERMINED THAT THIS PROSPECTUS IS ACCURATE OR COMPLETE.
IT IS A CRIMINAL OFFENSE TO STATE OTHERWISE.
 
                                  May 1, 1999
<PAGE>   2
 
                               A.G. SERIES TRUST
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
COVER PAGE
 
WELCOME.....................................................    1
 
PORTFOLIO FACT SHEETS.......................................    2
     American General U.S. Government Securities
      Portfolio.............................................    2
     Credit Suisse Growth and Income Portfolio..............    4
     Credit Suisse International Equity Portfolio...........    6
     EliteValue Portfolio...................................    8
     State Street Global Advisors Growth Equity Portfolio...   10
     State Street Global Advisors Money Market Portfolio....   12
     Van Kampen Emerging Growth Portfolio...................   14
 
MORE ABOUT PORTFOLIO INVESTMENTS............................   16
     Equity Securities......................................   16
     Fixed Income Securities................................   16
     Money Market Instruments...............................   16
     Foreign Securities.....................................   17
     Portfolio Turnover.....................................   17
     A Word about Risk......................................   17
     Managing Investment Risk...............................   19
 
MANAGEMENT OF THE TRUST.....................................   20
     Investment Adviser.....................................   20
     Investment Sub-Advisers................................   20
     Advisory Fees..........................................   21
 
GENERAL INFORMATION ABOUT THE TRUST.........................   22
     Portfolio Shares.......................................   22
     Net Asset Value........................................   22
     Dividends and Capital Gains............................   22
     Tax Consequences.......................................   22
 
FINANCIAL HIGHLIGHTS........................................   23
</TABLE>
    
 
   
                                      ( i)
    
<PAGE>   3
 
WELCOME
- --------------------------------------------------------------------------------
 
   
This Prospectus provides important information about the A.G. Series Trust (the
"Trust") and its seven Portfolios. A.G. Investment Advisory Services, Inc. (the
"Adviser") serves as the investment adviser for all seven Portfolios and employs
sub-advisers to assist it in managing six of them.
    
 
Individuals can't invest in the shares of the Portfolios directly. Instead they
participate through variable annuity contracts ("Contracts") issued by American
General Annuity Insurance Company (the "Company"). You can participate either
through a Contract that you purchase yourself or through a Contract purchased by
your employer.
 
Through your participation in the Contracts, you indirectly participate in
Portfolio earnings or losses, in proportion to the amount of money you invest.
Depending on your Contract, if you withdraw your money before retirement, you
may incur charges and additional tax liabilities. However, to save for
retirement, you generally should let your investments and their earnings build.
At retirement, you may withdraw all or a portion of your money, leave it until
you need it, or start receiving annuity payments. At a certain age you may be
required to begin withdrawals. For further information about your Contract,
please refer to your Contract prospectus.
 
The Contracts are sold by banks. An investment in a Portfolio of the Trust
through a Contract is not a deposit of a bank and is not insured or guaranteed
by the Federal Deposit Insurance Corporation or any other government agency.
 
A WORD ABOUT THE PORTFOLIOS
 
The Portfolios offered in this Prospectus fall into three general investment
categories: growth, growth and income and income.
 
GROWTH CATEGORY
 
The goal of a Portfolio in the growth category is to increase the value of your
investment over the long term by investing mostly in stocks. Stocks are a type
of investment that can increase in value over a period of years. Companies sell
stock to get the money they need to grow. These companies often keep some of
their profits to reinvest in their business. As they grow, the value of their
stock may increase. This is how the value of your investment may increase.
 
The Trust's Growth Category includes:
    EliteValue Portfolio
    Emerging Growth Portfolio
    Growth Equity Portfolio
    International Equity Portfolio
 
GROWTH AND INCOME CATEGORY
 
The goal of a Portfolio in the growth and income category is to increase the
value of your investment over the long term and to provide income. Portfolios in
the growth and income category seek to conserve the value of your initial
investment and promote long-term growth and income by investing in equity
securities and income producing securities.
 
The Trust's Growth and Income Category includes:
    Growth and Income Portfolio
 
INCOME CATEGORY
 
Unlike Portfolios in the growth category, where the objective is to make the
Portfolio's investments increase in value, Portfolios in the income category try
to keep the value of their investments from falling, while providing an increase
in the value of your investment through the income earned on the Portfolio's
investments. To meet this objective, a Portfolio in the income category buys
investments that are expected to pay interest to the Portfolio on a regular
basis.
 
The Trust's Income Category includes:
    Money Market Portfolio
    U.S. Government Securities Portfolio
 
                                                                               1
<PAGE>   4
 
AMERICAN GENERAL
U.S. GOVERNMENT
SECURITIES PORTFOLIO
 
Fact Sheet
 
<TABLE>
<S>                      <C>
 
- -------------------------------------------------
Investment Adviser:      A.G. INVESTMENT ADVISORY
                         SERVICES, INC.
- -------------------------------------------------
Investment Category:     INCOME
</TABLE>
 
- --------------------------------------------------------------------------------
 
INVESTMENT OBJECTIVE
 
A high level of current income.
 
INVESTMENT STRATEGY
 
The Portfolio will invest primarily in fixed income securities and
mortgage-backed securities issued or guaranteed by the U.S. Government and its
agencies or instrumentalities and collateralized mortgage obligations backed by
such securities.
 
   
The Adviser uses a quantitative relative value approach which emphasizes total
return in the selection of securities.
    
 
The Portfolio seeks to moderate market risk by generally maintaining a weighted
average life within a range of two to five years. Weighted average life is a
measure of the expected life of a fixed income security and incorporates the
fixed income security's yield, coupon interest payments, final maturity and call
features into one measure.
 
<TABLE>
<CAPTION>
                                     Percent of
      Primary Investments          Total Assets*
- --------------------------------------------------
<S>                               <C>
U.S. Treasury obligations, U.S.   At least 80%
  Government securities,
  mortgage backed securities
  guaranteed by the Government
  National Mortgage Association
  ("GNMA"), the Federal National
  Mortgage Association ("FNMA"),
  the Federal Home Loan Mortgage
  Corporation ("FHLMC"),
  collateralized mortgage
  obligations for which the
  underlying securities include
  the above and repurchase
  agreements collateralized by
  any of the foregoing
- --------------------------------------------------
U.S. dollar-denominated           Up to 20%
  corporate debt securities of
  U.S. and foreign issuers rated
  "A" or better by Moody's
  Investors Service, Inc.
  ("Moody's") or Standard &
  Poor's Corporation ("S&P") or
  of comparable quality
- --------------------------------------------------
</TABLE>
 
 *  At time of purchase
 
INVESTMENT RISKS
 
   
Because of the following principal risks the value of your investment may
fluctuate and you could lose money:
    
 
Market Risk: the risk that the value of the securities purchased by the
Portfolio will decline as a result of economic, political or market conditions
or an issuer's financial circumstances.
 
Credit Risk: the risk that an issuer of a fixed income security owned by the
Portfolio may be unable to make interest or principal payments.
 
Interest Rate Risk: the risk that fluctuations in interest rates may affect the
value of the Portfolio's interest-paying fixed income securities.
 
   
Prepayment Risk: the risk that issuers of fixed income securities will make
prepayments earlier than anticipated during periods of falling interest rates
requiring the Portfolio to invest in new securities with lower interest rates.
This will reduce the stream of cash payments that flow through to the Portfolio.
    
 
   
Manager Risk: like all managed funds, there is a risk that the Portfolio's
management strategy may not achieve the desired results and the Portfolio's
performance may lag behind that of similar funds.
    
 
For more information
about each type of
investment, please
read the section in
this prospectus called
"MORE ABOUT PORTFOLIO
INVESTMENTS."
 
 2
<PAGE>   5
 
- --------------------------------------------------------------------------------
 
PERFORMANCE INFORMATION
 
The performance information presented herein is intended to help you evaluate
the potential risks and rewards of an investment in the Portfolio by showing
changes in the Portfolio's performance and comparing the Portfolio's performance
with the performance of the U.S. Treasury -- 1-10 Year Index. How the Portfolio
performed in the past is not necessarily an indication of how the Portfolio will
perform in the future.
 
   
This chart illustrates the Portfolio's annual returns for the last two calendar
years. Charges imposed by the Contracts that invest in the Portfolio are not
included in the calculations of return in this bar chart, and if those charges
were included, the returns would have been less than those shown below.
    
                                    [CHART]
 
The highest quarterly return for the Portfolio from January 1, 1997 to December
31, 1998 was 3.72% (for the quarter ending September 30, 1998) and the lowest
quarterly return was 0.10% (for the quarter ending December 31, 1998).
 
This table compares the Portfolio's average annual returns to the returns of the
U.S. Treasury -- 1-10 Year Index for 1 calendar year and since inception.
 
<TABLE>
<CAPTION>
- -----------------------------------------------------------------
                   (through December 31, 1998)
- -----------------------------------------------------------------
                                                  Since Inception
                                         1 Year     (02/06/96)
<S>                                      <C>      <C>
U.S. Government Securities Portfolio     7.49%         6.79%
U.S. Treasury -- 1-10 Year Index         8.49%         7.38%
- -----------------------------------------------------------------
</TABLE>
 
                                                                               3
<PAGE>   6
 
CREDIT SUISSE GROWTH
AND INCOME PORTFOLIO
 
Fact Sheet
 
<TABLE>
<S>                      <C>
- -------------------------------------------------
Investment Sub-Adviser:  CREDIT SUISSE ASSET
                         MANAGEMENT
- -------------------------------------------------
Investment Category:     GROWTH AND INCOME
</TABLE>
 
- --------------------------------------------------------------------------------
 
INVESTMENT OBJECTIVE
 
Long term growth of capital, current income and growth of income, consistent
with reasonable investment risk.
 
INVESTMENT STRATEGY
 
The Portfolio will invest primarily in equity securities, fixed income
securities and cash instruments. The amount of the Portfolio's investment in
each type of security varies, from time-to-time, depending upon how the Sub-
adviser assesses economic conditions and investment opportunities.
 
Top-Down/Bottom-Up. In selecting equity securities, the Sub-adviser uses a
value-oriented approach that combines "top-down" and "bottom-up" elements. This
means that the Sub-adviser identifies the "top-down" economic factors most
likely to influence the return on equity securities and the industry sectors
most likely to grow based on those factors. The "bottom-up" analysis involves
the review of individual companies in the industry sectors that the Sub-adviser
has identified to assess whether a company has quality management and strong
growth potential.
 
Valuation Analysis. To select fixed income securities for the Portfolio, the
Sub-adviser reviews the terms of an instrument and evaluates the
creditworthiness of an issuer. The Sub-adviser then performs a valuation
analysis to compare the value of certain debt securities to other fixed income
securities in terms of their price and yield. Generally, the fixed income
portion of the Portfolio is invested consistent with a comparable broad market
index, such as the Lehman Brothers Aggregate Bond Index. The average weighted
maturity of the fixed income securities that the Sub-adviser purchases for the
Portfolio ranges from five to fifteen years.
 
The Portfolio will be invested in cash and cash equivalent instruments to the
extent necessary to achieve its investment objective.
 
   
<TABLE>
<CAPTION>
                                        Percent of
         Primary Investments           Total Assets*
- ----------------------------------------------------
<S>                                    <C>
U.S. and foreign equity securities,    No more than
  including common stock, preferred    65% and no
  stock, rights and warrants           less than 35%
- ----------------------------------------------------
U.S. and foreign fixed income          No more than
  securities, including bonds,         65% and no
  debentures, mortgage-backed          less than 35%
  securities and obligations issued
  or guaranteed by the U.S.
  government or its agencies or
  instrumentalities ("U.S. Government
  securities") and cash equivalent
  instruments
- ----------------------------------------------------
</TABLE>
    
 
  * At time of purchase
 
INVESTMENT RISKS
 
   
Because of the following principal risks the value of your investment may
fluctuate and you could lose money:
    
 
   
Value Investing Risk: the risk that the portfolio manager's judgment that a
particular security is undervalued in relation to the company's fundamental
economic values may prove incorrect.
    
 
Market Risk: the risk that the value of the securities purchased by the
Portfolio will decline as a result of economic, political or market conditions
or an issuer's financial circumstances.
 
Credit Risk: the risk that an issuer of a fixed income security owned by the
Portfolio may be unable to make interest or principal payments.
 
Interest Rate Risk: the risk that fluctuations in interest rates may affect the
value of the Portfolio's interest-paying fixed income securities.
 
   
Foreign Securities Risk: the risk of owning foreign securities not usually
associated with owning U.S. securities include fluctuations in foreign
currencies, foreign currency exchange controls, political and economic
instability, differences in accounting standards or governmental supervision and
clearance and settlement procedures.
    
 
   
Manager Risk: like all managed funds, there is a risk that the Portfolio's
management strategy of correctly identifying the economic factors may not
achieve the desired results and the Portfolio's performance may lag behind that
of similar funds.
    
 
For more information
about each type of
investment, please
read the section in
this prospectus called
"MORE ABOUT PORTFOLIO
INVESTMENTS."
 
 4
<PAGE>   7
 
- --------------------------------------------------------------------------------
 
PERFORMANCE INFORMATION
 
   
The performance information presented herein is intended to help you evaluate
the potential risks and rewards of an investment in the Portfolio by showing
changes in the Portfolio's performance and comparing the Portfolio's performance
with the performance of the Standard & Poor's 500 Stock Index ("S&P 500 Index"),
Lehman Brothers Aggregate Bond Index ("Lehman Aggregate") and a composite 50%
S&P 500 Index/50% Lehman Aggregate. How the Portfolio performed in the past is
not necessarily an indication of how the Portfolio will perform in the future.
    
 
   
This chart illustrates the Portfolio's annual returns for each of the last three
calendar years. Charges imposed by the Contracts that invest in the Portfolio
are not included in the calculations of return in this bar chart, and if those
charges were included, the returns would have been less than those shown below.
    
                                    [CHART]
 
The highest quarterly return for the Portfolio from January 1, 1996 to December
31, 1998 was 11.15% (for the quarter ending June 30, 1997) and the lowest
quarterly return was -4.16% (for the quarter ending September 30, 1998).
 
This table compares the Portfolio's average annual returns to the returns of the
S&P 500 Index, Lehman Aggregate and a composite 50% S&P 500 Index/50% Lehman
Aggregate, for 1 calendar year and since inception.
 
<TABLE>
<CAPTION>
- -----------------------------------------------------------------
                   (through December 31, 1998)
- -----------------------------------------------------------------
                                                  Since Inception
                                         1 Year     (10/20/95)
<S>                                      <C>      <C>
Growth and Income Portfolio              14.16%       17.89%
S&P 500 Index                            28.58%       29.03%
Lehman Aggregate                          8.69%        7.86%
50% S&P Index/ 50% Lehman Aggregate      18.63%       18.45%
- -----------------------------------------------------------------
</TABLE>
 
                                                                               5
<PAGE>   8
 
CREDIT SUISSE
INTERNATIONAL
EQUITY PORTFOLIO
 
Fact Sheet
 
<TABLE>
<S>                      <C>
 
- -------------------------------------------------
Investment Sub-Adviser:  CREDIT SUISSE ASSET
                         MANAGEMENT LTD.
- -------------------------------------------------
Investment Category:     GROWTH
</TABLE>
 
- --------------------------------------------------------------------------------
 
INVESTMENT OBJECTIVE
 
Long term capital appreciation.
 
INVESTMENT STRATEGY
 
The Portfolio will invest primarily in equity securities of companies located in
at least five foreign countries. The Sub-adviser expects that a majority of the
Portfolio's investments will be in equity securities issued by companies located
in: Australia, Brazil, Canada, France, Germany, Hong Kong, Italy, Japan,
Malaysia, Mexico, the Netherlands, New Zealand, Singapore, Spain, Sweden,
Switzerland, the United Kingdom and the United States. The Portfolio is not
limited with respect to the foreign markets in which it may invest and will also
invest in other European, Pacific Rim, African and Latin American markets
including developing markets. Developing market countries generally include
countries in the initial stages of their industrialization with low per capita
income.
 
In selecting securities for the Portfolio, the Sub-adviser seeks economic and
market environments favorable for capital appreciation. The Portfolio's
investments in developing countries are made based upon the Sub-adviser's
determination that the economic, political and stock markets in those countries
are stabilizing or improving.
 
The Sub-adviser looks for one or more of the following characteristics in
selecting foreign companies for investment:
  - earnings growth potential
  - high return on invested capital
  - sound financial and accounting policies
  - overall financial strength
  - strong competitive advantages
  - effective research, product development and marketing
  - strength of management
 
<TABLE>
<CAPTION>
                                     Percent of
      Primary Investments          Total Assets*
- --------------------------------------------------
<S>                               <C>
Equity securities of issuers      At least 65%
  located in at least five
  countries, other than the U.S.
  including, American Depository
  Receipts ("ADRs"), Global
  Depository Receipts ("GDRs"),
  European Depository Receipts
  ("EDRs"), International
  Depository Receipts ("IDRs"),
  common stock, preferred stock,
  convertible securities,
  convertible preferred stock,
  rights and warrants
- --------------------------------------------------
Equity securities of issuers      Up to 35%
  located in the U.S.
- --------------------------------------------------
</TABLE>
 
 *  At time of purchase
 
INVESTMENT RISKS
 
   
Because of the following principal risks the value of your investment may
fluctuate and you could lose money:
    
 
Market Risk: the risk that the value of the securities purchased by the
Portfolio will decline as a result of economic, political or market conditions
or an issuer's financial circumstances.
 
Foreign Securities Risks:
 
  Political Risk: the risk that a change in a foreign government will occur and
  that the assets of a company in which the Portfolio has invested will be
  affected.
 
   
  Currency Risk: the risk that a foreign currency will decline in value. The
  Portfolio generally will trade, for hedging purposes, in currencies other than
  the U.S. dollar. An increase in the value of the U.S. dollar relative to a
  foreign currency will adversely affect the value of the Portfolio.
    
 
  Liquidity Risk: foreign markets may be less liquid and more volatile than U.S.
  markets and offer less protection to investors.
 
  Limited Information Risk: the risk that foreign companies may not be subject
  to accounting standards or governmental supervision comparable to U.S.
  companies and that less public information about their operations may exist.
 
  Developing Country Risk: the risks associated with investment in foreign
  securities are heightened in connection with investments in the securities of
  issues in developing countries, as these markets are generally more volatile
  than the markets of developed countries.
 
  Settlement and Clearance Risk: the risks associated with the clearance and
  settlement procedures in non-U.S. markets, which may be unable to keep pace
  with the volume of securities transactions and may cause delays.
 
   
Manager Risk: like all managed funds, there is a risk that the Portfolio's
management strategy may not achieve the desired results and the Portfolio's
performance may lag behind that of similar funds.
    
 
For more information
about each type of
investment, please
read the section in
this prospectus called
"MORE ABOUT PORTFOLIO
INVESTMENTS."
 
 6
<PAGE>   9
 
- --------------------------------------------------------------------------------
 
PERFORMANCE INFORMATION
 
The performance information presented herein is intended to help you evaluate
the potential risks and rewards of an investment in the Portfolio by showing
changes in the Portfolio's performance and comparing the Portfolio's performance
to the performance of the Morgan Stanley Composite Index -- EAFE. How the
Portfolio performed in the past is not necessarily an indication of how the
Portfolio will perform in the future.
 
   
This chart illustrates the Portfolio's annual returns for each of the last three
calendar years. Charges imposed by the Contracts that invest in the Portfolio
are not included in the calculations of return in this bar chart, and if those
charges were included, the returns would have been less than those shown below.
    
                                    [CHART]
 
The highest quarterly return for the Portfolio from January 1, 1996 to December
31, 1998 was 14.25% (for the quarter ending December 31, 1998) and the lowest
quarterly return was -18.28% (for the quarter ending September 30, 1998).
 
This table compares the Portfolio's average annual returns to the returns of the
Morgan Stanley Composite Index -- EAFE for 1 calendar year and since inception.
 
<TABLE>
<CAPTION>
- -----------------------------------------------------------------
                   (through December 31, 1998)
- -----------------------------------------------------------------
                                                  Since Inception
                                         1 Year     (10/20/95)
<S>                                      <C>      <C>
International Equity Portfolio           -0.86%         7.27%
Morgan Stanley Composite Index -- EAFE   20.00%        10.82%
- -----------------------------------------------------------------
</TABLE>
 
                                                                               7
<PAGE>   10
 
ELITEVALUE PORTFOLIO
 
Fact Sheet
 
<TABLE>
<S>                      <C>
 
- -------------------------------------------------
Investment Sub-Adviser:  OPCAP ADVISORS
- -------------------------------------------------
Investment Category:     GROWTH
</TABLE>
 
- --------------------------------------------------------------------------------
 
INVESTMENT OBJECTIVE
 
Growth of capital over time through investment in a portfolio consisting of
common stocks, bonds and cash equivalents, the percentages of which will vary
based on the Sub-adviser's assessment of the relative outlook for such
investments.
 
INVESTMENT STRATEGY
 
The Portfolio will invest primarily in the equity securities of companies that
the Sub-adviser believes are undervalued in relation to their assets or
earnings. The Sub-adviser generally intends to invest in equity securities of
companies that possess one or more of the following characteristics:
 
  - undervalued assets
  - valuable consumer or commercial franchises
  - securities valuation below peer companies
  - substantial and growing cash flow
  - favorable book to price ratio
 
To a lesser extent, the Sub-adviser will invest in the securities of companies
with a market capitalization of less than $1 billion.
 
The Portfolio also may invest in fixed income securities and foreign securities.
The foreign markets in which the Portfolio may invest include developing
markets. Developing market countries generally include countries in the initial
stages of their industrialization with low per capita income.
 
There is no minimum or maximum percentage of the Portfolio's assets that may be
invested in each type of security. The Sub-adviser allocates the Portfolio's
investments among equity securities, fixed income securities and foreign
securities based upon the Sub-adviser's evaluation of economic and market trends
and its assessment of the value to be earned from each type of security at any
given time.
 
<TABLE>
<CAPTION>
                                     Percent of
      Primary Investments          Total Assets*
- --------------------------------------------------
<S>                               <C>
Equity securities, including      No minimum or
  common stock, preferred stock,  maximum
  convertible securities, rights
  and warrants
- --------------------------------------------------
Foreign securities listed on an   No minimum or
  exchange, represented by ADRs   maximum
  listed on an exchange or
  traded in over-the-counter
  markets
- --------------------------------------------------
Fixed income securities,          No minimum or
  including intermediate to long  maximum
  term investment grade
  corporate debt,
  mortgage-backed securities and
  U.S. Government securities
- --------------------------------------------------
Cash and money market             No minimum or
  instruments, including U.S.     maximum
  Government securities,
  certificates of deposit,
  short-term investment grade
  corporate bonds, short term
  securities and repurchase
  agreements
- --------------------------------------------------
</TABLE>
 
 *  At time of purchase
 
INVESTMENT RISKS
 
   
Because of the following principal risks the value your investment may fluctuate
and you could lose money:
    
 
   
Value Investing Risk: the risk that the portfolio manager's judgment that a
particular security is undervalued in relation to the company's fundamental
economic value may prove incorrect.
    
 
Market Risk: the risk that the value of the securities purchased by the
Portfolio will decline as a result of economic, political or market conditions
or an issuer's financial circumstances.
 
Small Capitalization Company Risk: the risk that smaller companies may be
subject to more abrupt or erratic market movements than securities of larger,
more established companies or markets, generally.
 
Credit Risk: the risk that an issuer of a fixed income security owned by the
Portfolio may be unable to make interest or principal payments.
 
Interest Rate Risk: the risk that fluctuations in interest rates may affect the
value of the Portfolio's interest-paying fixed income securities.
 
Prepayment Risk: the risk that issuers of fixed income securities will make
prepayments earlier than anticipated during periods of falling interest rates
requiring the Portfolio to invest in new securities with lower interest rates.
This will reduce the stream of cash payments that flow through to the Portfolio.
 
Foreign Securities Risks:
 
  Political Risk: the risk that a change in a foreign government will occur and
  that the assets of a company in which the Portfolio has invested will be
  affected.
 
  Currency Risk: the risk that a foreign currency will decline in value. The
  Portfolio generally will trade in currencies other than the U.S. dollar. An
  increase in the value of the U.S. dollar relative to a foreign currency will
  adversely affect the value of the Portfolio.
 
  Liquidity Risk: foreign markets may be less liquid and more volatile than U.S.
  markets and offer less protection to investors.
 
  Limited Information Risk: the risk that foreign companies may not be subject
  to accounting standards or governmental supervision comparable to U.S.
  companies and that less public information about their operations may exist.
 
  Developing Country Risk: the risks associated with investment in foreign
  securities are heightened in connection with investments in
 
For more information
about each type of
investment, please
read the section in
this prospectus called
"MORE ABOUT PORTFOLIO
INVESTMENTS."
 
 8
<PAGE>   11
 
- --------------------------------------------------------------------------------
 
  the securities of issuers in developing countries, as these markets are
  generally more volatile than the markets of developed countries
 
  Settlement and Clearance Risk: the risks associated with the clearance and
  settlement procedures in non-U.S. markets, which may be unable to keep pace
  with the volume of securities transactions and may cause delays.
 
   
Manager Risk: like all managed funds, there is a risk that the Portfolio's
management strategy may not achieve the desired results and the Portfolio's
performance may lag behind that of similar funds.
    
 
PERFORMANCE INFORMATION
 
The performance information presented herein is intended to help you evaluate
the potential risks and rewards of an investment in the Portfolio by showing
changes in the Portfolio's performance and comparing the Portfolio's performance
with the performance of the S&P 500 Index and the Lipper Flexible Portfolio
Funds Index ("Lipper Flex"). How the Portfolio performed in the past is not
necessarily an indication of how the Portfolio will perform in the future.
 
   
This chart illustrates the Portfolio's annual return for the last three calendar
years. Charges imposed by the Contracts that invest in the Portfolio are not
included in the calculations of return in this bar chart, and if those charges
were included, the returns would have been less than those shown below.
    
                                    [CHART]
 
The highest quarterly return for the Portfolio from January 2, 1996 to December
31, 1998 was 11.70% (for the quarter ending June 30, 1997) and the lowest
quarterly return was -14.02% (for the quarter ending September 30 1998).
 
This table compares the Portfolio's average annual returns to the returns of the
S&P 500 Index and the Lipper Flex for 1 calendar year and since inception.
 
<TABLE>
<CAPTION>
- -----------------------------------------------------------------
                   (through December 31, 1998)
- -----------------------------------------------------------------
                                                  Since Inception
                                         1 Year     (01/02/96)
<S>                                      <C>      <C>
EliteValue Portfolio                      6.72%       17.86%
S&P 500 Index                            28.58%       16.27%
Lipper Flex                              16.52%       16.27%
- -----------------------------------------------------------------
</TABLE>
 
                                                                               9
<PAGE>   12
 
STATE STREET GLOBAL
ADVISORS GROWTH EQUITY
PORTFOLIO
 
Fact Sheet
 
<TABLE>
<S>                      <C>
 
- -------------------------------------------------
Investment Sub-Adviser:  STATE STREET GLOBAL
                         ADVISORS
- -------------------------------------------------
Investment Category:     GROWTH
</TABLE>
 
- --------------------------------------------------------------------------------
 
INVESTMENT OBJECTIVE
 
Total returns that exceed, over time, the Standard & Poor's 500(TM) Composite
Stock Price Index ("Index") through investment in equity securities.
 
INVESTMENT STRATEGY
 
   
The Sub-adviser will attempt to outperform the investment results of the Index
by creating a portfolio that has similar market risk characteristics to the
Index, but will use a disciplined analysis as described herein to identify those
securities having the greatest likelihood of either outperforming or
underperforming the market.
    
 
The Sub-adviser chooses securities for the Portfolio based on an analytical
model that the Sub-adviser has developed. The model measures a security by
"value" and "Wall Street sentiment." The value of a security is measured by
comparing a company's assets, the projected growth of its earnings and its cash
flow with its stock price. Wall Street sentiment measures the earnings estimates
and rankings issued by Wall Street analysts with respect to a particular
company. These measures are combined to create a single score and equity
securities are ranked by their score.
 
   
The Portfolio invests primarily in equity securities issued by companies in a
particular industry, or economic sector, in similar proportions as the Index.
The Sub-adviser believes that maintaining these levels will protect the
Portfolio from unnecessary exposure to external factors, including the direction
of the economy, interest rates, energy prices and inflation.
    
 
   
The Portfolio is not limited in its investments to only those companies included
in the Index. In general, the Portfolio will invest in the top 1200 U.S.
securities as measured by total stock market capitalization.
    
 
   
<TABLE>
<CAPTION>
                                     Percent of
      Primary Investments          Total Assets*
- --------------------------------------------------
<S>                               <C>
Equity securities of U.S.         At least 65%
  issuers
- --------------------------------------------------
Repurchase agreements, reverse    Up to 25%
  repurchase agreements, forward
  commitments, when-issued
  transactions
- --------------------------------------------------
</TABLE>
    
 
 *  At time of purchase
 
INVESTMENT RISK
 
   
Because of the following principal risks the value of your investment may
fluctuate and you could lose money:
    
 
Market Risk: the risk that the value of the securities purchased by the
Portfolio will decline as a result of economic, political or market conditions
or an issuer's financial circumstances.
 
   
Manager Risk: like all managed funds, there is a risk that the Portfolio's
management strategy may not achieve the desired results and the Portfolio's
performance may lag behind that of similar funds.
    
 
For more information
about each type of
investment, please
read the section in
this prospectus called
"MORE ABOUT PORTFOLIO
INVESTMENTS."
 
 10
<PAGE>   13
 
- --------------------------------------------------------------------------------
 
PERFORMANCE INFORMATION
 
The performance information presented herein is intended to help you evaluate
the potential risks and rewards on investments in the Portfolio by showing
changes in the Portfolio's performance and comparing the Portfolio's performance
with the performance of the S&P 500 Index. How the Portfolio performed in the
past is not necessarily an indication of how the Portfolio will perform in the
future.
 
   
This chart below illustrates the Portfolio's annual returns for each of the last
three calendar years. Charges imposed by the Contracts that invest in the
Portfolio are not included in the calculations of return in this bar chart, and
if those charges were included, the returns would have been less than those
shown below.
    
                                    [CHART]
 
The highest quarterly return for the Portfolio from January 1, 1996 to December
31, 1998 was 21.43% (for the quarter ending December 31, 1998) and the lowest
quarterly return was -13.55% (for the quarter ending September 30, 1998).
 
This table compares the Portfolio's average annual returns to the returns of the
S&P 500 Index for 1 calendar year and since inception.
 
<TABLE>
<CAPTION>
- ------------------------------------------------------------------
                   (through December 31, 1998)
- ------------------------------------------------------------------
                                                        Since
                                                      Inception
                                          1 Year     (10/20/95)
<S>                                       <C>      <C>
Growth Equity Portfolio                   21.60%        24.40%
S&P 500 Index                             28.58%        28.33%
- ------------------------------------------------------------------
</TABLE>
 
                                                                              11
<PAGE>   14
 
STATE STREET GLOBAL
ADVISORS MONEY MARKET
PORTFOLIO
 
Fact Sheet
 
<TABLE>
<S>                      <C>
 
- -------------------------------------------------
Investment Sub-Adviser:  STATE STREET GLOBAL
                         ADVISORS
- -------------------------------------------------
Investment Category:     INCOME
</TABLE>
 
- --------------------------------------------------------------------------------
 
INVESTMENT OBJECTIVE
 
Seeks to maximize current income, to the extent consistent with the preservation
of capital and liquidity and the maintenance of a stable $1.00 per share net
asset value, by investing in dollar-denominated securities with remaining
maturities of 13 months or less.
 
INVESTMENT STRATEGY
 
   
The Portfolio invests in high quality money market securities to provide you
with current income, and liquidity. Such securities must mature in 13 months or
less and the Portfolio must have a dollar-weighted average portfolio maturity of
90 days or less. The Portfolio's investment practices are designed to minimize
any fluctuation in the value of the Portfolio's investments.
    
 
The investments this Portfolio may buy include:
  - Securities issued or guaranteed by the U.S. Government, its agencies or
    instrumentalities
  - Asset-backed securities
  - Certificates of deposit and other obligations of U.S. and foreign banks
  - Commercial paper of U.S. and foreign companies
  - Corporate debt obligations with remaining maturities of 13 months or less
 
INVESTMENT RISKS
 
The short-term money market securities the Portfolio invests in are high-quality
investments posing low credit and interest rate risk. Because the risk to the
money you invest is low, the potential for profit is also low.
 
   
Because of the following principal risks the value of your investment may
fluctuate and you could lose money:
    
  - The rate of income varies daily depending on short-term interest rates
  - A significant change in interest rates or a default on a security held by
    the Portfolio could cause the value of your investment to decline
  - An investment in the Portfolio is not insured or guaranteed by the Federal
    Deposit Insurance Corporation or any other government agency
  - Although the Portfolio seeks to preserve the value of your investment at
    $1.00 per share, it is possible to lose money by investing in the Portfolio
 
For more information
about each type of
investment, please
read the section in
this prospectus called
"MORE ABOUT PORTFOLIO
INVESTMENTS."
 
 12
<PAGE>   15
 
- --------------------------------------------------------------------------------
 
PERFORMANCE INFORMATION
 
The performance information presented herein is intended to help you evaluate
the potential risks and rewards of an investment in the Portfolio by showing
changes in the Portfolio's performance and comparing the Portfolio's performance
with the performance of the 91-day Treasury Bill Index. How the Portfolio
performed in the past is not necessarily an indication of how the Portfolio will
perform in the future.
 
   
This chart illustrates the Portfolio's annual returns for each of the last three
calendar years. Charges imposed by the Contracts that invest in the Portfolio
are not included in the calculations of return in this bar chart, and if those
charges were included, the returns would have been less than those shown below.
    
                                    [CHART]
 
The highest quarterly return for the Portfolio from January 1, 1996 to December
31, 1998 was 1.37% (for the quarter ending September 30, 1997) and the lowest
quarterly return was 1.18% (for the quarter ending December 31, 1998).
 
This table compares the Portfolio's average annual returns to the returns of the
91-day Treasury Bill Index for 1 calendar year and since inception.
 
<TABLE>
<CAPTION>
- -----------------------------------------------------------------
                   (through December 31, 1998)
- -----------------------------------------------------------------
                                                  Since Inception
                                         1 Year     (10/10/95)
<S>                                      <C>      <C>
Money Market Portfolio                   5.23%         5.30%
91-day Treasury Bill Index               4.88%         5.09%
- -----------------------------------------------------------------
</TABLE>
 
                                                                              13
<PAGE>   16
 
VAN KAMPEN EMERGING
GROWTH PORTFOLIO
 
Fact Sheet
 
<TABLE>
<S>                      <C>
- -------------------------------------------------
Investment Sub-Adviser:  VAN KAMPEN ASSET
                         MANAGEMENT INC.
- -------------------------------------------------
Investment Category:     GROWTH
</TABLE>
 
- --------------------------------------------------------------------------------
 
INVESTMENT OBJECTIVE
 
Capital appreciation; any ordinary income received from portfolio securities is
entirely incidental. This investment objective may be changed by the Trustees
without shareholder approval.
 
INVESTMENT STRATEGY
 
   
The Portfolio invests in the equity securities of small and medium-sized
emerging growth companies in the early stages of their life cycles that the
Sub-adviser believes have the potential to become major enterprises. These
companies may be located in the U.S. and in foreign countries. Investing in such
companies involves risks not ordinarily associated with investments in larger,
more established companies.
    
 
   
<TABLE>
<CAPTION>
                                     Percent of
      Primary Investments          Total Assets*
- --------------------------------------------------
<S>                               <C>
Equity securities of U.S. and     At least 65%
  foreign small and medium sized
  companies, including common
  stocks, preferred stocks,
  convertible securities and
  warrants
- --------------------------------------------------
Foreign securities                Up to 20%
- --------------------------------------------------
</TABLE>
    
 
 *  At time of purchase
 
INVESTMENT RISKS
 
   
Because of the following principal risks the value of your investment may
fluctuate and you could lose money:
    
 
   
Market Risk: the risk that the value of the securities purchased by the
Portfolio will decline as a result of economic, political or market conditions
or an issuer's financial circumstances. During an overall market decline,
security prices of small and medium sized companies often fluctuate more and
often fall more than the prices of larger company stocks. It is possible that
the securities of such small and medium sized companies will be more volatile
and underperform the overall stock market. Historically, smaller and medium
sized company securities have sometimes gone through extended periods when they
did not perform as well as larger company securities.
    
 
   
Risk of Emerging Growth Companies: the risk that emerging growth companies which
often have limited product lines, markets, distribution channels or financial
resources and management may be dependent upon one or a few key people. The
securities of such emerging growth companies can therefore be generally subject
to more abrupt or erratic market movements than securities of larger, more
established companies or the stock market in general.
    
 
   
Foreign Securities Risk: the risk of owning foreign securities not usually
associated with owning U.S. securities include fluctuations in foreign
currencies, foreign currency exchange controls, political and economic
instability, differences in accounting standards or governmental supervision and
clearance and settlement procedures.
    
 
   
Manager Risk: like all managed funds, there is a risk that the Portfolio's
management strategy may not achieve the desired results and the Portfolio's
performance may lag behind that of similar funds.
    
 
For more information
about each type of
investment, please
read the section in
this prospectus called
"MORE ABOUT PORTFOLIO
INVESTMENTS."
 
 14
<PAGE>   17
 
- --------------------------------------------------------------------------------
 
PERFORMANCE INFORMATION
 
The performance information presented herein is intended to help you evaluate
the potential risks and rewards of an investment in the Portfolio by showing
changes in the Portfolio's performance and comparing the Portfolio's performance
with the performance of the Russell Mid Cap Growth Index and the Lipper Mid Cap
Funds Index. How the Portfolio performed in the past is not necessarily an
indication of how the Portfolio will perform in the future.
 
   
This chart illustrates the Portfolio's annual returns for the last three
calendar years. Charges imposed by the Contracts that invest in the Portfolio
are not included in the calculations of return in this bar chart, and if those
charges were included, the returns would have been less than those shown below.
    
                                    [CHART]
 
The highest quarterly return for the Portfolio from January 2, 1996 to December
31, 1998 was 28.40% (for the quarter ending December 31, 1998) and the lowest
quarterly return was -12.30% (for the quarter ending September 30, 1998).
 
This table compares the Portfolio's average annual returns to the returns of the
Russell Mid Cap Growth Index and the Lipper Mid Cap Funds Index for 1 calendar
year and since inception.
 
   
<TABLE>
<CAPTION>
- -----------------------------------------------------------------
                   (through December 31, 1998)
- -----------------------------------------------------------------
                                                  Since Inception
                                         1 Year     (01/02/96)
<S>                                      <C>      <C>
Emerging Growth Portfolio                37.43%       25.38%
Russell Mid Cap Growth Index             17.86%       19.81%
Lipper Mid Cap Funds Index               13.92%       16.49%
- -----------------------------------------------------------------
</TABLE>
    
 
                                                                              15
<PAGE>   18
 
MORE ABOUT PORTFOLIO INVESTMENTS
- --------------------------------------------------------------------------------
 
EQUITY SECURITIES
 
Equity securities represent an ownership position in a company. The prices of
equity securities fluctuate based on changes in the financial condition of the
issuing company and on market and economic conditions. Companies sell equity
securities to get the money they need to grow.
 
Stocks are one type of equity security. Generally, there are two types of
stocks:
 
COMMON STOCK -- Each share of common stock represents a part of the ownership of
a company. The holder of common stock participates in the growth of a company
through increasing stock price and dividends. If a company experiences
difficulty, a stock price can decline and dividends may not be paid.
 
PREFERRED STOCK -- Each share of preferred stock allows the holder to receive a
dividend before the common stock shareholders received dividends on their
shares.
 
Other types of equity securities include, but are not limited to, convertible
securities, warrants, rights and foreign equity securities such as ADRs, GDRs,
EDRs and IDRs.
 
FIXED INCOME SECURITIES
 
Fixed income securities include a broad array of short, medium and long term
obligations, including notes and bonds. Fixed income securities may have fixed,
variable or floating rates of interest, including rates of interest that vary
inversely at a multiple of a designated or floating rate, or that vary according
to changes in relative values of currencies. Fixed income securities generally
involve an obligation of the issuer to pay interest on either a current basis or
at the maturity of the security and to repay the principal amount of the
security at maturity.
 
Bonds are one type of fixed income security and are sold by governments on the
local, state and federal levels and by companies. Investing in a bond is like
making a loan for a fixed period of time at a fixed interest rate. During the
fixed period, the bond pays interest on a regular basis. At the end of the fixed
period, the bond matures and the investor usually gets back the principal amount
of the bond.
 
Fixed periods to maturity are categorized as:
  - Short-term (generally less than 12 months)
  - Intermediate- or medium-term (one to ten years)
  - Long-term (10 years or more)
 
COMMERCIAL PAPER -- is a specific type of corporate or short-term note. In fact,
it is very short-term, being paid in less than 270 days. Most commercial paper
matures in 50 days or less.
 
MORTGAGE-BACKED SECURITIES -- are securities representing interests in "pools"
of mortgage loans securitized by residential or commercial property.
 
Payments of interest and principal on these securities are generally made
monthly, in effect, "passing through" monthly payments made by individual
borrowers on the mortgage loans which underlie the securities.
 
U.S. GOVERNMENT SECURITIES -- are obligations of, or guaranteed by the U.S.
Government or its agencies or instrumentalities. Some U.S. Government
securities, such as Treasury bills, notes, bonds and securities issued by GNMA,
are supported by the full faith and credit of the U.S.; other such as securities
issued by the Federal Home Loan Banks, are supported by the right of the issuer
to borrow from the U.S. Treasury; others such as those of FNMA, and FHLMC are
supported by the discretionary authority of the U.S. Government to purchase the
agency's obligations, while still others such as those of the Student Loan
Marketing Association, the Tennessee Valley Authority and the Small Business
Authority are supported only by the credit of the instrumentality.
 
Bonds, commercial paper and mortgage-backed securities are not the only types of
fixed income securities. Other fixed income securities include, but are not
limited to, convertible bonds, debentures and notes, asset-backed securities,
certificates of deposit, fixed time deposits, bankers' acceptances, repurchase
agreements and reverse repurchase agreements.
 
MONEY MARKET INSTRUMENTS
 
All of the Portfolios may invest in high quality money market instruments. A
money market instrument is high quality when it is rated in one of the two
highest rating categories by S&P or Moody's or another nationally recognized
service, or if unrated, deemed high quality by the Adviser or a Sub-adviser.
 
High quality money market instruments may include:
  - Cash and cash equivalents
  - U.S. Government securities
  - Certificates of deposit or other obligations of U.S. banks with total assets
    in excess of $1 billion
  - Corporate debt obligations with remaining maturities of 13 months or less
 
For more
information about
EQUITY SECURITIES,
see the Statement
of Additional
Information.
 
For more information
about FIXED INCOME
SECURITIES, see the
Statement of
Additional
Information.
 
For more information
about MONEY MARKET
INSTRUMENTS, see the
Statement of
Additional
Information.
 
 16
<PAGE>   19
MORE ABOUT PORTFOLIO INVESTMENTS -- (CONTINUED)
- --------------------------------------------------------------------------------
 
  - Commercial paper sold by corporations and finance companies
  - Repurchase agreements, money market securities of foreign issuers payable in
    U.S. dollars, asset-backed securities, loan participation and adjustable
    rate securities
  - Bankers' acceptances
  - Time deposits
 
FOREIGN SECURITIES
 
Foreign securities are the equity, fixed income or money market securities of
foreign issuers. Securities of foreign issuers include obligations of foreign
branches of U.S. banks and of foreign banks, common and preferred stocks, and
fixed income securities issued by foreign governments, corporations and
supranational organizations. They also include ADRs, GDRs, IDRs and EDRs.
 
ADRs are certificates issued by a U.S. bank or trust company and represent the
right to receive securities of a foreign issuer deposited in a domestic bank or
foreign branch of a U.S. Bank. GDRs, IDRs and EDRs are receipts evidencing an
arrangement with a non-U.S. bank.
 
PORTFOLIO TURNOVER
 
Portfolio turnover occurs when a Portfolio sells its investments and buys new
ones. In some Portfolios, high portfolio turnover occurs when they engage in
frequent trading as part of their investment strategy.
 
High portfolio turnover may cause a Portfolio's expenses to increase. For
example, a Portfolio may have to pay brokerage fees and other related expenses.
A portfolio turnover rate of 100% or more a year is considered high. A high rate
increases a Portfolio's transaction costs and expenses.
 
   
The Financial Highlights table herein shows the portfolio turnover rate for each
of the Portfolios, other than the Money Market Portfolio during prior fiscal
years.
    
 
   
A WORD ABOUT RISK
    
 
As described in the fact sheet for each Portfolio, participation in a Portfolio
involves risk -- even the risk that you will receive a minimal return on your
investment or the value of your investment will decline. It is important for you
to consider carefully the following risks when you allocate purchase payments to
the Portfolios.
 
MARKET RISK
 
Market risk refers to the loss of capital resulting from changes in the price of
investments. Generally, equity securities are considered to be subject to market
risk. For example, market risk occurs when the expectations of lower corporate
profits in general cause the broad market of stocks to fall in price. When this
happens, even though a company may be experiencing a growth in profits, the
price of its stock could fall.
 
CREDIT RISK
 
Credit risk refers to the risk that an issuer of a fixed income security may be
unable to pay principal or interest payments due on the securities. To help the
Portfolios' Adviser and Sub-advisers decide which corporate and foreign fixed
income securities to buy, they rely on Moody's and S&P (two nationally
recognized bond rating services), and on their own research, to lower the risk
of buying a fixed income security of a company that may not pay the interest or
principal on the fixed income security.
 
The credit risk of a Portfolio depends on the quality of its investments. Fixed
income securities that are rated as investment grade have ratings ranging from
AAA to BBB. These fixed income securities are considered to have adequate
ability to make interest and principal payments.
 
INTEREST RATE RISK
 
Interest rate risk refers to the risk that fluctuations in interest rates may
affect the value of interest paying securities in a Portfolio. Fixed income
securities such as U.S. Government bonds are subject to interest rate risk. If a
Portfolio sells a bond before it matures, it may lose money, even if the bond is
guaranteed by the U.S. Government. Say, for example, a Portfolio bought an
intermediate government bond last year that was paying interest at a fixed rate
of 6%. Now, intermediate government bonds are paying interest at a rate of 7%.
If the Portfolio wants to sell the bond paying an interest rate of 6%, it will
have to sell it at a discount (and realize a loss) to attract buyers because
they can buy new bonds paying an interest rate of 7%.
 
PREPAYMENT RISK
 
Many types of fixed income securities, including mortgage backed securities, are
subject to prepayment risk. Prepayment risk is the risk that issuers of fixed
income securities will make prepayments earlier than anticipated during periods
of falling interest rates requiring a Portfolio to invest in new securities with
lower interest rates. This will reduce the stream of cash payments that flow
through to the Portfolio. Securities subject to prepayment risk also pose a
 
                                                                              17
<PAGE>   20
MORE ABOUT PORTFOLIO INVESTMENTS -- (CONTINUED)
- --------------------------------------------------------------------------------
 
potential for loss when interest rates rise. Rising interest rates may cause
prepayments to occur at a slower rate than expected thereby lengthening the
maturity of the security and making it more sensitive to interest rate changes.
 
RISKS ASSOCIATED WITH FOREIGN SECURITIES
 
A foreign security is a security issued by an entity domiciled or incorporated
outside of the U.S. Among the principal risks of owning foreign securities are:
 
  Political Risk: the risk that a change in a foreign government will occur and
  that the assets of a company in which the Portfolio has invested will be
  affected. In some countries there is the risk that the government may take
  over the assets or operations of a company and or that the government may
  impose taxes or limits on the removal of a Portfolio's assets from that
  country.
 
  Currency Risk: the risk that a foreign currency will decline in value. As long
  as a Portfolio holds a security denominated in a foreign currency, its value
  will be affected by the value of that currency relative to the U.S. dollar. An
  increase in the value of the U.S. dollar relative to a foreign currency will
  adversely affect the value of the Portfolio.
 
  Liquidity Risk: foreign markets may be less liquid and more volatile than U.S.
  markets and offer less protection to investors. Certain markets may require
  payment for securities before delivery and delays may be encountered in
  settling securities transactions. In some foreign markets, there may not be
  protection against failure by other parties to complete transactions.
 
  Limited Information Risk: the risk that less government supervision of foreign
  markets may occur. Foreign issuers may not be subject to the uniform
  accounting, auditing and financial reporting standards and practices that
  apply to U.S. issuers. In addition, less public information about their
  operations may exist.
 
  Developing Country Risk: the risks associated with investment in foreign
  securities are heightened in connection with investments in the securities of
  issuers in developing countries. Developing countries are generally defined as
  countries in the initial stages of their industrialization cycles with low per
  capita income. Although the markets of developing countries offer higher rates
  of return, they also pose additional risks to investors, including immature
  economic structures, national policies restricting investments by foreigners
  and different legal systems.
 
  Settlement and Clearance Risk: the risks associated with the different
  clearance and settlement procedures that are utilized in certain foreign
  markets. In certain foreign markets, settlements may be unable to keep pace
  with the volume of securities transactions, which may cause delays. If there
  is a settlement delay, a Portfolio's assets may be uninvested and not earning
  returns. A Portfolio also may miss investment opportunities or be unable to
  dispose of a security because of these delays.
 
YEAR 2000 RISK
 
   
Like other mutual funds, financial and business organizations and individuals
around the world, the Trust could be adversely affected if the computer systems
of the Adviser and the Sub-advisers and other service providers, over which the
Trust may have no control, do not properly process and calculate date-related
information and data from and after January 1, 2000. This is commonly referred
to as the "Year 2000 Problem."
    
 
   
When the Year 2000 arrives, the Trust's operations could be adversely affected
if the computer systems used by the Adviser or the Sub-advisers, their service
providers and other third parties they do business with are not Year 2000 ready.
For example, the Trust's Portfolios and operational areas could be impacted,
including securities trade processing, securities pricing, reporting, custody
functions and others. The Trust could experience difficulties in effecting
transactions if any of its foreign subcustodians, or foreign broker/dealers or
foreign markets are not ready for Year 2000.
    
 
   
When evaluating current and potential portfolio positions, Year 2000 is one of
the factors that a Portfolio's Sub-adviser may consider. Sub-advisers may rely
upon public filings and other statements made by companies regarding their Year
2000 readiness. Issuers in countries outside of the U.S., particularly in
emerging markets, may be more susceptible to Year 2000 problems and may not be
required to make the same level of disclosure regarding Year 2000 readiness as
is required in the U.S. The Sub-advisers, of course, cannot audit any company or
their major suppliers to verify Year 2000 readiness. If a company in which any
Portfolio is invested is adversely affected by Year 2000 problems, it is likely
that the price of its security will also be
    
 
 18
<PAGE>   21
MORE ABOUT PORTFOLIO INVESTMENTS -- (CONTINUED)
- --------------------------------------------------------------------------------
 
   
adversely affected. A decrease in the value of one or more of a Portfolio's
holdings will have similar impact on the Portfolio's performance.
    
 
   
The Adviser is taking steps that it believes are reasonably designed to address
the Year 2000 Problem with respect to computer systems that it uses. The Adviser
is also seeking assurances that its Sub-advisers and other service providers are
taking similar steps as well. However, it is impossible to know exactly how the
Year 2000 Problem will affect the administration of the Trust, performance of
the Trust's portfolios or securities markets in general.
    
 
MANAGING INVESTMENT RISKS
 
In pursuing their investment objectives, each Portfolio assumes investment risk.
The Portfolios try to limit their investment risk by diversifying their
investment portfolios across different industry sectors.
 
INVESTMENT LIMITATIONS
 
   
The Portfolios have adopted certain investment limitations that cannot be
changed without shareholder approval and are designed to limit your investment
risk and maintain investment portfolio diversification. Each Portfolio may not:
    
 
   
  - Invest, with respect to 75% of its total asset, more than 5% of its total
    assets in any one issuer (other than U.S. Government securities)
    
   
  - Invest more than 25% of its net assets in any one industry (except with
    respect to obligations of U.S. banks in the case of the Money Market
    Portfolio)
    
  - Borrow money, except as a temporary measure
 
DEFENSIVE INVESTMENT STRATEGY
 
Under normal market conditions, none of the Portfolios, other than the Money
Market Portfolio, intend to have a substantial portion of its assets invested in
cash or money market instruments, though the U.S. Government Securities
Portfolio will have a substantial portion of its assets in U.S. Government
securities. When the Adviser or a Sub-adviser determines that adverse market
conditions exist, a Portfolio may adopt a temporary defensive posture and invest
entirely in cash and money market securities. When a Portfolio is invested in
this manner, it may not be able to achieve its investment objective.
 
HEDGING STRATEGIES
 
   
Each Portfolio may use investment strategies to limit the risk of price
fluctuations and preserve capital. The strategies used by all the Portfolios,
other than the Money Market Portfolio, may include financial futures contracts,
options on financial futures, options on securities and options on broad market
indices. The Growth Equity Portfolio and the U.S. Government Securities
Portfolio may use options on securities as well.
    
 
   
The EliteValue Portfolio, the Growth and Income Portfolio and the International
Equity Portfolio may purchase and sell foreign currencies on a spot basis in
connection with the settlement of transactions traded in such foreign
currencies. A Portfolio may also hedge the risks associated with its investments
by entering into forward foreign currency contracts and foreign currency futures
and options contracts, generally in anticipation of making investments in
companies whose securities are denominated in those currencies.
    
 
                                                                              19
<PAGE>   22
 
MANAGEMENT OF THE TRUST
- --------------------------------------------------------------------------------
 
INVESTMENT ADVISER
 
The Adviser (formerly, AGA Investment Advisory Services, Inc. and prior to that,
WNL Investment Advisory Services, Inc.), a Delaware corporation, has been in the
investment advisory business since 1994. The Adviser, as of December 31, 1998,
had over $71 million in assets under management. The Adviser has been the
Investment Adviser for the Portfolios that comprise the Trust since their
inception.
 
The Adviser is an indirect subsidiary of Western National Corporation, a
Delaware corporation. Effective February 25, 1998, Western National Corporation
became a wholly owned subsidiary of AGC Life Insurance Company, a Missouri
domiciled life insurer and a wholly owned subsidiary of American General
Corporation, a Texas corporation.
 
The Adviser is a member of the American General Corporation group of companies.
The American General Corporation group of companies is a leading provider of
retirement services, life insurance and consumer loans. Members of the American
General Corporation group of companies operate in each of the 50 states and
Canada.
 
The Adviser oversees the Portfolios' day-to-day operations and supervises the
purchase and sale of Portfolio investments. The Adviser employs Investment
Sub-advisers to make investment decisions for six of the Portfolios.
 
   
Leon A. Olver, C.F.A. is responsible for the day-to-day management of the U.S.
Government Securities Portfolio. Prior to joining the Adviser, Mr. Olver worked
for First Heights Bank, Houston, Texas; he was Vice President, Assistant
Treasurer from 1991 to 1994; and Vice President, Treasurer from 1994 to 1995.
Mr. Olver currently is Vice President and Investment Officer for American
General Series Portfolio Company and Vice President of US LIFE Income Fund, Inc.
    
 
   
The Adviser serves in its capacity as Investment Adviser through an investment
advisory agreement it enters into with the Trust. The Investment Advisory
Agreement provides for the Trust to pay all expenses not specifically assumed by
the Adviser. Examples of expenses paid by the Trust include transfer agency
fees, custodial fees, the fees of outside legal and auditing firms. The
Investment Advisory Agreement is renewed each year by the Trustees.
    
 
One Investment Advisory Agreement dated April 21, 1995 covers all seven
Portfolios.
 
INVESTMENT SUB-ADVISERS
 
For six of the Portfolios, the Adviser works with Investment Sub-advisers,
financial service companies that specialize in certain types of investing.
However, the Adviser still retains ultimate responsibility for managing these
Portfolios. The Sub-advisers' role is to make investment decisions for these six
Portfolios according to the Portfolios' investment objectives and restrictions.
 
The Sub-Advisers are:
 
CREDIT SUISSE ASSET MANAGEMENT ("CSAM OF NEW YORK")
 
CSAM of New York is the Sub-adviser for the Growth and Income Portfolio. CSAM of
New York is a diversified asset manager, handling global equity, balanced,
fixed-income, and derivative securities accounts for private individuals, as
well as corporate pension and profit-sharing plans, state pension funds, union
funds, endowments, and other charitable institutions. CSAM of New York, together
with its predecessor firms, has been engaged in the investment advisory business
for more than 60 years. As of December 31, 1998, CSAM of New York had
approximately $39 billion in assets under management.
 
The CSAM of New York Domestic Equity Management Team manages the equity portion
of the Growth and Income Portfolio and the CSAM of New York Fixed-Income
Management Team manages the fixed income portion of the Growth and Income
Portfolio.
 
CREDIT SUISSE ASSET MANAGEMENT, LTD. ("CSAM") CSAM is the Sub-adviser for the
International Equity Portfolio. CSAM has been offering diverse global
fixed-income and equity investment strategies for institutional clients in more
than 45 countries worldwide since 1983 and, until June 1995, under the name CS
First Boston Investment Management Limited. Clients include central banks and
other government entities, insurance companies, pension funds, multinational
corporations, commercial banks, and other institutions. As of December 31, 1998,
CSAM had approximately $39 billion in assets under management.
 
Glenn Wellman, Managing Director and head of Global Equity Portfolio Management
for the Sub-adviser, is responsible for the day-to-day management of the
International Equity Portfolio.
 
THE ADVISER'S
PRINCIPAL OFFICES are
located at 2929 Allen
Parkway, Houston,
Texas 77019.
 
CSAM OF NEW
YORK'S PRINCIPAL
OFFICES are located at
One Citicorp Center,
153 East 53rd Street,
New York, New York
10022.
 
CSAM'S PRINCIPAL
OFFICES are located at
Beaufort House,
15 St. Botolph
Street,
London, England.
 
 20
<PAGE>   23
MANAGEMENT OF THE TRUST -- (CONTINUED)
- --------------------------------------------------------------------------------
 
Mr. Wellman joined the Sub-adviser in 1993. Prior to joining the Sub-adviser,
Mr. Wellman spent 14 years with Alliance Capital Limited, most recently as chief
investment officer, with responsibility for developing the firm's global equity
management practice.
 
OPCAP ADVISORS ("OPCAP")
 
   
OpCap is the Sub-adviser for the EliteValue Portfolio. OpCap is a majority-owned
subsidiary of Oppenheimer Capital, a registered investment adviser whose
employees perform portfolio management services for the EliteValue Portfolio.
Oppenheimer Capital has operated as an investment adviser since 1968, and as of
December 31, 1998, had approximately $62.5 billion in assets under management.
    
 
Richard J. Glasebrook II is responsible for the day-to-day management of the
EliteValue Portfolio. Mr. Glasebrook is a managing director of Oppenheimer
Capital. He joined Oppenheimer Capital in 1991.
 
STATE STREET GLOBAL ADVISORS
 
State Street Global Advisors is the Sub-adviser for the Growth Equity Portfolio
and the Money Market Portfolio. State Street Global Advisors is the investment
management division of State Street Bank and Trust Company, one of the largest
providers of securities processing and recordkeeping services for U.S. mutual
funds and pension funds. Through its offices in the United States, London,
Sydney, Hong Kong, Tokyo, Toronto, Luxembourg, Melbourne, Montreal, and Paris,
State Street Global Advisors provides complete global investment management
services. State Street Global Advisors had more than $489.7 billion in assets
under management as of December 31, 1998.
 
A committee of the Sub-adviser manages the Growth Equity Portfolio. No one
person is primarily responsible for making investment recommendations to that
committee.
 
VAN KAMPEN ASSET MANAGEMENT INC. ("VAN KAMPEN")
 
Van Kampen is the Sub-adviser for the Emerging Growth Portfolio. Van Kampen
advises more than 50 open-end mutual funds, 39 closed-end mutual funds and 2,500
unit investment trusts. As of December 31, 1998, Van Kampen had more than $50
billion in assets under management.
 
Gary M. Lewis is primarily responsible for the day-to-day management of the
Emerging Growth Portfolio. Mr. Lewis has been Senior Vice President of the
Sub-adviser since October 1995. Previously, he served as Vice
President-Portfolio Manager of the Sub-Adviser from 1989 to October 1995.
 
ADVISORY FEES
 
Each Portfolio pays the Adviser a fee based on its average daily net asset
value. A Portfolio's net asset value is the total value of the Portfolio's
assets minus any money it owes for operating expenses plus any other
liabilities, such as the fee paid to its Custodian to safeguard the Portfolio's
investments.
 
Here is a list of the advisory fees paid by each Portfolio during the most
recent fiscal year after expense reimbursement.
 
<TABLE>
<CAPTION>
                                  Advisory Fee Paid
                                     (as a % of
                                  average daily net
           Portfolio                   assets)
- ---------------------------------------------------
<S>                               <C>
EliteValue Portfolio                     .65%
Emerging Growth Portfolio                .75%
Growth and Income Portfolio              .75%
Growth Equity Portfolio                  .61%
International Equity Portfolio           .90%
Money Market Portfolio                   .45%
U.S. Government Securities
  Portfolio                             .475%
</TABLE>
 
OPCAP ADVISORS'
PRINCIPAL OFFICES are
located at One World
Financial Center,
200 Liberty Street,
New York,
New York 10281.
 
STATE STREET GLOBAL
ADVISORS' PRINCIPAL
OFFICES are located at
Two Internation
Place, Boston,
Massachusetts 02110.
 
VAN KAMPEN ASSET
MANAGEMENT'S PRINCIPAL
OFFICES are located at
One Parkview Plaza,
Oakbrook Terrace,
Illinois 60181.
 
                                                                              21
<PAGE>   24
 
GENERAL INFORMATION ABOUT THE TRUST
- --------------------------------------------------------------------------------
 
PORTFOLIO SHARES
 
The Trust offers shares of the Portfolios only to the Company's separate
account. As a Contract owner or participant, you do not directly buy shares of a
Portfolio. Instead, your purchase payments are applied towards the purchase of
units in either a registered or unregistered separate account of the Company.
When you or your employer purchases a Contract, you specify which Portfolios you
want the separate account to invest your money in, and the separate account buys
shares of those Portfolios according to your instructions. Share certificates
are not available.
 
When the separate account buys, sells or transfers shares of the Portfolios, it
does not pay any charges related to these transactions.
 
For more information on how to participate, see your Contract prospectus.
 
NET ASSET VALUE
 
HOW NET ASSET VALUE IS CALCULATED
 
Here is how the Trust calculates the net asset value of each Portfolio's shares:
 
   
<TABLE>
<S>  <C>                       <C>  <C>
Step 1:
     Total value of the
     Portfolio's assets*            The Portfolio's
     (including money owed to    =  Total Net Asset
     the Portfolio but not          Value
     yet collected)
- -    The Portfolio's
     liabilities (including
     money owed by the
     Portfolio but not yet
     paid)
Step 2:
     The Portfolio's total
     net asset value (from
     Step 1)
/    The total number of the        NET ASSET VALUE
     Portfolio's shares that     =  PER SHARE
     are outstanding.
</TABLE>
    
 
- ---------------
 
* The Trust uses the fair market value of Portfolio's investments to calculate
  the Portfolio's total value. However, it uses the amortized cost method to
  determine the values of all the Money Market Portfolio's investments and of
  any other Portfolio's short-term securities maturing within 60 days. The
  amortized cost method approximates fair market value.
 
If a Portfolio owns investments that are not sold often or are not sold on any
exchange, the Trustees or their delegate will, in good faith, estimate the fair
market value of these investments.
 
WHEN NET ASSET VALUE IS CALCULATED
 
The Trust calculates the net asset value of each Portfolio's shares at
approximately 4 pm EST each day the New York Stock Exchange ("Exchange") is
open. (The Exchange is open Monday through Friday but is closed on certain
federal and other holidays.) The Trust is closed the day after Thanksgiving even
though the Exchange is open.
 
DIVIDENDS AND CAPITAL GAINS
 
Net investment income generally includes stock dividends received and bond
interest earned less expenses paid by a Portfolio. Each Portfolio pays dividends
from its net investment income occasionally. Dividends from net investment
income are automatically reinvested for you into additional shares of the
Portfolio. The Money Market Portfolio declares dividends daily and pays them
monthly.
 
When a Portfolio sells a security at a profit, a capital gain results. Once a
year, each Portfolio pays distributions from capital gains, as long as total
capital gains exceed total capital losses. Distributions from capital gains are
automatically reinvested for you into additional shares of the Portfolio. The
Money Market Portfolio does not anticipate that it will normally realize any
long-term capital gains with respect to its Portfolio securities.
 
TAX CONSEQUENCES
 
As the owner of a Contract or a participant under your employer's contract, you
will not be directly affected by the federal income tax consequences of
distributions, sales or redemptions of Portfolio shares. You should consult the
prospectus for your Contract for further information concerning the federal
income tax consequences to you of investing in the Portfolios.
 
 22
<PAGE>   25
 
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
 
   
The Financial Highlights table is intended to help you understand each of the
Portfolio's financial performance for the period shown. Certain information
reflects financial results for a single Portfolio share. The total return
figures in the table represent the rate that an investor would have earned on an
investment in the Trust (assuming reinvestment of all dividends and
distributions). For the year ended December 31, 1998, Ernst & Young LLP has
audited this information and its report and the Trust's financial statements are
included in the Statement of Additional Information, which is available upon
request. Other auditors have audited this information for the years ended,
December 31, 1997, 1996, and 1995.
    
 
                 FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD
 
<TABLE>
<CAPTION>
                                                        AMERICAN GENERAL U.S. GOVERNMENT
                                                             SECURITIES PORTFOLIO*
                                                   ------------------------------------------
                                                       YEAR           YEAR          PERIOD
                                                      ENDED          ENDED          ENDED
                                                   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                                       1998           1997          1996**
                                                   ------------   ------------   ------------
<S>                                                <C>            <C>            <C>
NET ASSET VALUE
Net asset value, beginning of period.............     $10.07         $ 9.79         $10.00
                                                      ------         ------         ------
INVESTMENT OPERATIONS
Net investment income(1).........................       0.52           0.57           0.53
Net realized and unrealized gain (loss)..........       0.22           0.28          (0.21)
                                                      ------         ------         ------
Total from investment operations.................       0.74           0.85           0.32
                                                      ------         ------         ------
DISTRIBUTIONS TO SHAREHOLDERS FROM:
Net investment income............................      (0.54)         (0.57)         (0.53)
                                                      ------         ------         ------
Net realized gains...............................      (0.04)            --             --
Total distributions to shareholders..............      (0.58)         (0.57)         (0.53)
                                                      ------         ------         ------
Net asset value, end of period...................     $10.23         $10.07         $ 9.79
                                                      ======         ======         ======
TOTAL RETURN.....................................       7.49%          8.89%          3.40%(2)
RATIOS AND SUPPLEMENTAL DATA
Expenses to average net assets(3)................       0.53%          0.35%          0.22%(4)
Net investment income to average net assets......       5.95%          6.25%          5.91%(4)
Portfolio turnover rate..........................         24%           615%           297%
Net assets, end of period (000's)................     $8,679         $3,986         $2,347
</TABLE>
 
- ---------------
 
 *  Prior to March 8, 1999, the American General U.S. Government Securities
    Portfolio was sub-advised by Salomon Brothers Asset Management, Inc. and
    known as the Salomon Brothers U.S. Government Securities Portfolio.
 
**  The American General U.S. Government Securities Portfolio commenced
    operations on February 6, 1996.
 
   
(1) Net investment income is after waiver of fees and reimbursement of certain
    expenses by the Adviser, State Street Bank and Trust Company (the
    "Sub-administrator") and American General Annuity Insurance Company, an
    affiliate of the Adviser (see Note 2 to the financial statements). If the
    Adviser and the Sub-administrator had not waived fees and American General
    Annuity Insurance Company had not reimbursed expenses for the periods ended
    December 31, 1998, December 31, 1997, and December 31, 1996, net investment
    income (loss) per share would have been $0.40, $0.28 and $0.10,
    respectively, for the American General U.S. Government Securities Portfolio.
    
 
(2) Total return represents aggregate total return for the period indicated and
    is not annualized.
 
   
(3) If the Adviser and the Sub-administrator had not waived fees and American
    General Annuity Insurance Company had not reimbursed expenses for the
    periods ended December 31, 1998, December 31, 1997, and December 31, 1996,
    the ratio of operating expenses to average net assets would have been 2.46%,
    4.84% and 5.26%, respectively, for the American General U.S. Government
    Securities Portfolio.
    
 
(4) Annualized.
 
                                                                              23
<PAGE>   26
FINANCIAL HIGHLIGHTS -- (CONTINUED)
- --------------------------------------------------------------------------------
 
                 FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD
 
<TABLE>
<CAPTION>
                                              CREDIT SUISSE GROWTH AND INCOME PORTFOLIO
                                      ---------------------------------------------------------
                                          YEAR           YEAR           YEAR          PERIOD
                                         ENDED          ENDED          ENDED          ENDED
                                      DECEMBER 31,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                          1998           1997           1996          1995*
                                      ------------   ------------   ------------   ------------
<S>                                   <C>            <C>            <C>            <C>
NET ASSET VALUE
Net asset value, beginning of
  period............................    $ 12.72         $11.04         $10.46         $10.00
                                        -------         ------         ------         ------
INVESTMENT OPERATIONS
Net investment income(1)............       0.27           0.33           0.47           0.14
Net realized and unrealized gain
  (loss)............................       1.52           2.11           0.96           0.51
                                        -------         ------         ------         ------
Total from investment operations....       1.79           2.44           1.43           0.65
                                        -------         ------         ------         ------
DISTRIBUTIONS TO SHAREHOLDERS FROM:
Net investment income...............      (0.28)         (0.33)         (0.47)         (0.14)
Net realized gains..................      (0.34)         (0.43)         (0.38)            --
In excess of net realized gains.....         --             --             --          (0.05)
                                        -------         ------         ------         ------
Total distributions to
  shareholders......................      (0.62)         (0.76)         (0.85)         (0.19)
                                        -------         ------         ------         ------
Net asset value, end of period......    $ 13.89         $12.72         $11.04         $10.46
                                        =======         ======         ======         ======
TOTAL RETURN........................      14.16%         22.33%         13.82%          6.57%(2)
RATIOS AND SUPPLEMENTAL DATA
Expenses to average net assets(3)...       0.81%          0.62%          0.49%          0.12%(4)
Net investment income to average net
  assets............................       3.04%          2.87%          4.65%          6.99%(4)
Portfolio turnover rate.............        151%           191%           217%            75%
Net assets, end of period (000's)...    $16,713         $7,388         $3,145         $2,136
</TABLE>
 
- ---------------
 
 *  The Credit Suisse Growth and Income Portfolio commenced operations on
    October 20, 1995.
 
   
(1) Net investment income is after waiver of fees and reimbursement of certain
    expenses by the Adviser, the Sub-administrator and American General Annuity
    Insurance Company, an affiliate of the Adviser (see Note 2 to the financial
    statements). If the Adviser and the Sub-administrator had not waived fees
    and American General Annuity Insurance Company had not reimbursed expenses
    for the periods ended December 31, 1998, December 31, 1997, December 31,
    1996, and December 31, 1995, net investment income (loss) per share would
    have been $0.16, $0.10, $0.00 and $(0.06), respectively, for the Credit
    Suisse Growth and Income Portfolio.
    
 
(2) Total return represents aggregate total return for the period indicated and
    is not annualized.
 
   
(3) If the Adviser and the Sub-administrator had not waived fees and American
    General Annuity Insurance Company had not reimbursed expenses for the
    periods ended December 31, 1998, December 31, 1997, December 31, 1996, and
    December 31, 1995, the ratio of operating expenses to average net assets
    would have been 2.01%, 3.26%, 5.15% and 9.95%, respectively, for the Credit
    Suisse Growth and Income Portfolio.
    
 
(4) Annualized.
 
 24
<PAGE>   27
FINANCIAL HIGHLIGHTS -- (CONTINUED)
- --------------------------------------------------------------------------------
 
                 FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD
 
<TABLE>
<CAPTION>
                                          CREDIT SUISSE INTERNATIONAL EQUITY PORTFOLIO
                                    ---------------------------------------------------------
                                        YEAR           YEAR           YEAR          PERIOD
                                       ENDED          ENDED          ENDED          ENDED
                                    DECEMBER 31,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                        1998           1997           1996          1995*
                                    ------------   ------------   ------------   ------------
<S>                                 <C>            <C>            <C>            <C>
NET ASSET VALUE
Net asset value, beginning of
  period..........................     $10.35         $10.67         $10.33         $10.00
                                       ------         ------         ------         ------
INVESTMENT OPERATIONS
Net investment income(1)..........       0.06           0.08           0.15           0.06
Net realized and unrealized gain
  (loss)..........................      (0.15)          0.37           1.56           0.33
                                       ------         ------         ------         ------
Total from investment
  operations......................      (0.09)          0.45           1.71           0.39
                                       ------         ------         ------         ------
DISTRIBUTIONS TO SHAREHOLDERS
  FROM:
Net investment income.............      (0.03)         (0.12)         (0.15)         (0.06)
In excess of net investment
  income..........................         --          (0.20)            --             --
Net realized gains................         --          (0.45)         (0.24)            --
In excess of net realized gains...         --             --          (0.98)            --
                                       ------         ------         ------         ------
Total distributions to
  shareholders....................      (0.03)         (0.77)         (1.37)         (0.06)
                                       ------         ------         ------         ------
Net asset value, end of period....     $10.23         $10.35         $10.67         $10.33
                                       ======         ======         ======         ======
TOTAL RETURN......................      (0.86)%         4.30%         16.50%          3.93%(2)
RATIOS AND SUPPLEMENTAL DATA
Expenses to average net
  assets(3).......................       0.94%          0.77%          0.60%          0.12%(4)
Net investment income to average
  net assets......................       0.53%          0.71%          1.09%          2.89%(4)
Portfolio turnover rate...........         61%             6%            79%             2%
Net assets, end of period
  (000's).........................     $5,996         $4,310         $2,727         $2,083
</TABLE>
 
- ---------------
 
 *  The Credit Suisse International Equity Portfolio commenced operations on
    October 20, 1995.
 
   
(1) Net investment income is after waiver of fees and reimbursement of certain
    expenses by the Adviser, the Sub-administrator and American General Annuity
    Insurance Company, an affiliate of the Adviser (see Note 2 to the financial
    statements). If the Adviser and the Sub-administrator had not waived fees
    and American General Annuity Insurance Company had not reimbursed expenses
    for the periods ended December 31, 1998, December 31, 1997, December 31,
    1996, and December 31, 1995, net investment loss per share would have been
    $(0.19), $(0.29), $(1.25) and $(0.18), respectively, for the Credit Suisse
    International Equity Portfolio.
    
 
(2) Total return represents aggregate total return for the period indicated and
    is not annualized.
 
   
(3) If the Adviser and the Sub-administrator had not waived fees and American
    General Annuity Insurance Company had not reimbursed expenses for the
    periods ended December 31, 1998, December 31, 1997, December 31, 1996, and
    December 31, 1995, the ratio of operating expenses to average net assets
    would have been 3.78%, 5.06%, 6.41% and 11.83%, respectively, for the Credit
    Suisse International Equity Portfolio.
    
 
(4) Annualized.
 
                                                                              25
<PAGE>   28
FINANCIAL HIGHLIGHTS -- (CONTINUED)
- --------------------------------------------------------------------------------
 
                 FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD
 
<TABLE>
<CAPTION>
                                                            ELITEVALUE PORTFOLIO
                                                 ------------------------------------------
                                                     YEAR           YEAR          PERIOD
                                                    ENDED          ENDED          ENDED
                                                 DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                                     1998           1997          1996*
                                                 ------------   ------------   ------------
<S>                                              <C>            <C>            <C>
NET ASSET VALUE
Net asset value, beginning of period...........    $ 14.38         $12.32         $10.00
                                                   -------         ------         ------
INVESTMENT OPERATIONS
Net investment income(1).......................       0.25           0.19           0.18
Net realized and unrealized gain...............       0.72           2.39           2.48
                                                   -------         ------         ------
Total from investment operations...............       0.97           2.58           2.66
                                                   -------         ------         ------
DISTRIBUTIONS TO SHAREHOLDERS FROM:
Net investment income..........................      (0.25)         (0.19)         (0.18)
Net realized gains.............................      (0.15)         (0.33)         (0.16)
                                                   -------         ------         ------
Total distributions to shareholders............      (0.40)         (0.52)         (0.34)
                                                   -------         ------         ------
Net asset value, end of period.................    $ 14.95         $14.38         $12.32
                                                   =======         ======         ======
TOTAL RETURN...................................       6.72%         21.08%         26.70%(2)
RATIOS AND SUPPLEMENTAL DATA
Expenses to average net assets(3)..............       0.71%          0.52%          0.36%(4)
Net investment income to average net assets....       2.42%          1.58%          1.74%(4)
Portfolio turnover rate........................         39%            29%            21%
Net assets, end of period (000's)..............    $20,620         $9,471         $2,307
</TABLE>
 
- ---------------
 
 *  The EliteValue Portfolio commenced operations on January 2, 1996.
 
   
(1) Net investment income is after waiver of fees and reimbursement of certain
    expenses by the Adviser, the Sub-administrator and American General Annuity
    Insurance Company, an affiliate of the Adviser (see Note 2 to the financial
    statements). If the Adviser and the Sub-administrator had not waived fees
    and American General Annuity Insurance Company had not reimbursed expenses
    for the periods ended December 31, 1998, December 31, 1997 and December 31,
    1996, net investment income (loss) per share would have been $0.17, $0.00
    and $(0.54), respectively, for the EliteValue Portfolio.
    
 
(2) Total return represents aggregate total return for the period indicated and
    is not annualized.
 
   
(3) If the Adviser and the Sub-administrator had not waived fees and American
    General Annuity Insurance Company had not reimbursed expenses for the
    periods ended December 31, 1998, December 31, 1997 and December 31, 1996,
    the ratio of operating expenses to average net assets would have been 1.41%,
    2.76% and 7.45%, respectively, for the EliteValue Portfolio.
    
 
(4) Annualized.
 
 26
<PAGE>   29
FINANCIAL HIGHLIGHTS -- (CONTINUED)
- --------------------------------------------------------------------------------
 
                 FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD
 
<TABLE>
<CAPTION>
                                        STATE STREET GLOBAL ADVISORS GROWTH EQUITY PORTFOLIO
                                      ---------------------------------------------------------
                                          YEAR           YEAR           YEAR          PERIOD
                                         ENDED          ENDED          ENDED          ENDED
                                      DECEMBER 31,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                          1998           1997           1996          1995*
                                      ------------   ------------   ------------   ------------
<S>                                   <C>            <C>            <C>            <C>
NET ASSET VALUE
Net asset value, beginning of
  period............................    $ 14.07         $11.85         $10.31         $10.00
                                        -------         ------         ------         ------
INVESTMENT OPERATIONS
Net investment income(1)............       0.13           0.17           0.20           0.05
Net realized and unrealized gain....       2.89           3.56           1.99           0.31
                                        -------         ------         ------         ------
Total from investment operations....       3.02           3.73           2.19           0.36
                                        -------         ------         ------         ------
DISTRIBUTIONS TO SHAREHOLDERS FROM:
Net investment income...............      (0.13)         (0.17)         (0.20)         (0.05)
Net realized gains..................      (0.39)         (1.34)         (0.45)            --
                                        -------         ------         ------         ------
Total distributions to
  shareholders......................      (0.52)         (1.51)         (0.65)         (0.05)
                                        -------         ------         ------         ------
Net asset value, end of period......    $ 16.57         $14.07         $11.85         $10.31
                                        =======         ======         ======         ======
TOTAL RETURN........................      21.60%         31.67%         21.36%          3.57%(2)
RATIOS AND SUPPLEMENTAL DATA
Expenses to average net assets(3)...       0.66%          0.48%          0.39%          0.12%(4)
Net investment income to average net
  assets............................       0.88%          1.34%          1.80%          2.46%(4)
Portfolio turnover rate.............        140%           111%            89%             9%
Net assets, end of period (000's)...    $15,500         $7,327         $3,420         $2,073
</TABLE>
 
- ---------------
 
 *  The State Street Global Advisors Growth Equity Portfolio commenced
    operations on October 20, 1995.
 
   
(1) Net investment income is after waiver of fees and reimbursement of certain
    expenses by the Adviser, the Sub-administrator and American General Annuity
    Insurance Company, an affiliate of the Adviser (see Note 2 to the financial
    statements). If the Adviser and the Sub-administrator had not waived fees
    and American General Annuity Insurance Company had not reimbursed expenses
    for the periods ended December 31, 1998, December 31, 1997, December 31,1996
    and December 31, 1995, the net investment loss per share would have been
    $(0.02), $(0.11), $(0.29) and $(0.15), respectively, for the State Street
    Global Advisor Growth Equity Portfolio.
    
 
(2) Total return represents aggregate total return for the period indicated and
    is not annualized.
 
   
(3) If the Adviser and the Sub-administrator had not waived fees and American
    General Annuity Insurance Company had not reimbursed expenses for the
    periods ended December 31, 1998, December 31, 1997, December 31, 1996 and
    December 31, 1995, the ratio of operating expenses to average net assets
    would have been 1.96%, 3.29%, 4.83% and 9.94%, respectively, for the State
    Street Global Advisor Growth Equity Portfolio.
    
 
(4) Annualized.
 
                                                                              27
<PAGE>   30
FINANCIAL HIGHLIGHTS -- (CONTINUED)
- --------------------------------------------------------------------------------
 
                 FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD
 
<TABLE>
<CAPTION>
                                         STATE STREET GLOBAL ADVISORS MONEY MARKET PORTFOLIO
                                      ---------------------------------------------------------
                                          YEAR           YEAR           YEAR          PERIOD
                                         ENDED          ENDED          ENDED          ENDED
                                      DECEMBER 31,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                          1998           1997           1996          1995*
                                      ------------   ------------   ------------   ------------
<S>                                   <C>            <C>            <C>            <C>
NET ASSET VALUE
Net asset value, beginning of
  period............................     $ 1.00         $ 1.00         $ 1.00         $ 1.00
                                         ------         ------         ------         ------
INVESTMENT OPERATIONS
Net investment income(1)............       0.05           0.05           0.05           0.01
                                         ------         ------         ------         ------
Total from investment operations....       0.05           0.05           0.05           0.01
                                         ------         ------         ------         ------
DISTRIBUTIONS TO SHAREHOLDERS FROM:
Net investment income...............      (0.05)         (0.05)         (0.05)         (0.01)
                                         ------         ------         ------         ------
Total distributions to
  shareholders......................      (0.05)         (0.05)         (0.05)         (0.01)
                                         ------         ------         ------         ------
Net asset value, end of period......     $ 1.00         $ 1.00         $ 1.00         $ 1.00
                                         ======         ======         ======         ======
TOTAL RETURN........................       5.23%          5.50%          5.19%          1.17%(2)
RATIOS AND SUPPLEMENTAL DATA
Expenses to average net assets(3)...       0.49%          0.32%          0.29%          0.12%(4)
Net investment income to average net
  assets............................       5.12%          5.41%          5.23%          5.25%(4)
Net assets, end of period (000's)...     $9,254         $5,100         $1,291         $  126
</TABLE>
 
- ---------------
 
 *  The State Street Global Advisors Money Market Portfolio commenced operations
    on October 10, 1995.
 
   
(1) Net investment income is after waiver of fees and reimbursement of certain
    expenses by the Adviser, the Sub-administrator and American General Annuity
    Insurance Company, an affiliate of the Adviser (see Note 2 to the financial
    statements). If the Adviser and the Sub-administrator had not waived fees
    and American General Annuity Insurance Company had not reimbursed expenses
    for the periods ended December 31, 1998, December 31, 1997, December 31,
    1996, and December 31, 1995, net investment income (loss) per share would
    have been $0.04, $0.03, $(0.08) and $(0.35), respectively, for the State
    Street Global Advisors Money Market Portfolio.
    
 
(2) Total return represents aggregate total return for the period indicated and
    is not annualized.
 
   
(3) If the Adviser and the Sub-administrator had not waived fees and American
    General Annuity Insurance Company had not reimbursed expenses for the
    periods ended December 31, 1998, December 31, 1997, December 31, 1996, and
    December 31, 1995, the ratio of operating expenses to average net assets
    would have been 2.44%, 4.17%, 14.15% and 161.83%, respectively, for the
    State Street Global Advisors Money Market Portfolio.
    
 
(4) Annualized.
 
 28
<PAGE>   31
FINANCIAL HIGHLIGHTS -- (CONTINUED)
- --------------------------------------------------------------------------------
 
                 FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD
 
<TABLE>
<CAPTION>
                                                      VAN KAMPEN EMERGING GROWTH PORTFOLIO
                                                   ------------------------------------------
                                                       YEAR           YEAR          PERIOD
                                                      ENDED          ENDED          ENDED
                                                   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                                       1998           1997          1996*
                                                   ------------   ------------   ------------
<S>                                                <C>            <C>            <C>
NET ASSET VALUE
Net asset value, beginning of period.............    $ 13.87         $11.54         $10.00
                                                     -------         ------         ------
INVESTMENT OPERATIONS
Net investment income (loss)(1)..................      (0.03)          0.03           0.05
Net realized and unrealized gain.................       5.21           2.33           1.86
                                                     -------         ------         ------
Total from investment operations.................       5.18           2.36           1.91
                                                     -------         ------         ------
DISTRIBUTIONS TO SHAREHOLDERS FROM:
Net investment income............................         --          (0.03)         (0.05)
Net realized gains...............................         --             --          (0.32)
                                                     -------         ------         ------
Total distributions to shareholders..............         --          (0.03)         (0.37)
                                                     -------         ------         ------
Net asset value, end of period...................    $ 19.05         $13.87         $11.54
                                                     =======         ======         ======
TOTAL RETURN.....................................      37.43%         20.45%         19.06%(2)
RATIOS AND SUPPLEMENTAL DATA
Expenses to average net assets(3)................       0.80%          0.62%          0.46%(4)
Net investment income (loss) to average net
  assets.........................................      (0.57)%         0.23%          0.40%(4)
Portfolio turnover rate..........................        107%           107%           154%
Net assets, end of period (000's)................    $11,674         $5,499         $1,882
</TABLE>
 
- ---------------
 
 *  The Van Kampen Emerging Growth Portfolio commenced operations on January 2,
    1996.
 
   
(1) Net investment income is after waiver of fees and reimbursement of certain
    expenses by the Adviser, the Sub-administrator and American General Annuity
    Insurance Company, an affiliate of the Adviser (see Note 2 to the financial
    statements). If the Adviser and the Sub-administrator had not waived fees
    and American General Annuity Insurance Company had not reimbursed expenses
    for the periods ended December 31, 1998, December 31, 1997 and December 31,
    1996, net investment loss per share would have been $(0.26), $(0.42) and
    $(1.29), respectively, for the Van Kampen Emerging Growth Portfolio.
    
 
(2) Total return represents aggregate total return for the period indicated and
    is not annualized.
 
   
(3) If the Adviser and the Sub-administrator had not waived fees and American
    General Annuity Insurance Company had not reimbursed expenses for the
    periods ended December 31, 1998, December 31, 1997 and December 31, 1996,
    the ratio of operating expenses to average net assets would have been 2.64%,
    5.65% and 11.22%, respectively, for the Van Kampen Emerging Growth
    Portfolio.
    
 
(4) Annualized.
 
                                                                              29
<PAGE>   32
 
                          INTERESTED IN LEARNING MORE?
 
The Statement of Additional Information incorporated by reference into this
prospectus contains additional information about the Trust's operations.
 
Further information about the Trust's investments is available in the Trust's
annual and semi-annual reports to shareholders. The Trust's annual report
discusses market conditions and investment strategies that significantly
affected the Trust's performance results during its last fiscal year.
 
The Company can provide you with a free copy of these materials or other
information about the Trust. You may reach the Company by calling 1-800-424-4990
or by writing to the Company's Variable Annuity Service Center, 205 E. 10th
Avenue, Amarillo, Texas 79101.
 
The Securities and Exchange Commission also maintains copies of these documents:
 
       To view information on-line: Access the SEC's web site at
    http://www.sec.gov.
 
       To review a paper filing or to request that documents be mailed to you,
    contact:
 
                           SEC Public Reference Room
                          Washington, D.C. 20549-6009
                                1-800- SEC-0330
 
          A duplicating fee will be assessed for all copies provided.

The Trust's Investment Company Act filing number is 811-8912.
 
LOGO
 
   
ANNUITIES TO SECURE YOUR TOMORROW . . .
    
 
   
          AMERICAN GENERAL ANNUITY
    
   
          INSURANCE COMPANY
    
 
   
          Executive Offices: Houston, Texas
    
 
   
          Variable Annuity Services Center:
    
   
          205 E. 10th Avenue
    
   
          P.O. Box 871
    
   
          Amarillo, Texas 79105-0871
    
   
          1-800-424-4990
    
 
 
 30
<PAGE>   33
 
                               A.G. SERIES TRUST
                          [FORMERLY, AGA SERIES TRUST]
 
                      STATEMENT OF ADDITIONAL INFORMATION
 
                                  MAY 1, 1999

                             ---------------------
 
                               GROWTH PORTFOLIOS
 
                  CREDIT SUISSE INTERNATIONAL EQUITY PORTFOLIO
                       ("INTERNATIONAL EQUITY PORTFOLIO")
 
                             ELITE VALUE PORTFOLIO,
               [FORMERLY, ELITE VALUE ASSET ALLOCATION PORTFOLIO]
 
              STATE STREET GLOBAL ADVISORS GROWTH EQUITY PORTFOLIO
                          ("GROWTH EQUITY PORTFOLIO"),
              [FORMERLY, GLOBAL ADVISORS GROWTH EQUITY PORTFOLIO]
 
                      VAN KAMPEN EMERGING GROWTH PORTFOLIO
                         ("EMERGING GROWTH PORTFOLIO")
       [FORMERLY, VAN KAMPEN AMERICAN CAPITAL EMERGING GROWTH PORTFOLIO]

                             ---------------------
 
                          GROWTH AND INCOME PORTFOLIOS
 
                   CREDIT SUISSE GROWTH AND INCOME PORTFOLIO
                        ("GROWTH AND INCOME PORTFOLIO"),
                  [FORMERLY, BEA GROWTH AND INCOME PORTFOLIO]

                             ---------------------
 
                               INCOME PORTFOLIOS
 
             AMERICAN GENERAL U.S. GOVERNMENT SECURITIES PORTFOLIO
                    ("U.S. GOVERNMENT SECURITIES PORTFOLIO")
       [FORMERLY, SALOMON BROTHERS U.S. GOVERNMENT SECURITIES PORTFOLIO]
 
              STATE STREET GLOBAL ADVISORS MONEY MARKET PORTFOLIO
                          ("MONEY MARKET PORTFOLIO"),
               [FORMERLY, GLOBAL ADVISORS MONEY MARKET PORTFOLIO]
 
   
This Statement of Additional Information (the "SAI") contains information which
may be of interest to investors but which is not included in the Prospectus of
A.G. Series Trust, formerly AGA Series Trust and prior to that WNL Series Trust,
(the "Trust"). The SAI is not a prospectus and is only authorized for
distribution when accompanied or preceded by the Prospectus of the Trust dated
May 1, 1999. The SAI should be read together with the Prospectus. Investors may
obtain a free copy of the Prospectus by calling American General Annuity
Insurance Company, formerly Western National Life Insurance Company, (the
"Company") at 1-800-424-4990.
    
<PAGE>   34
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                               PAGE
                                                               ----
<S>                                                            <C>
DEFINITIONS.................................................     1
GENERAL INFORMATION.........................................     1
 
INVESTMENT STRATEGIES, POLICIES, AND RISKS OF THE TRUST.....     1
       Asset-backed Securities..............................     2
       Bank Obligations.....................................     2
       Borrowing, Reverse Repurchase Agreements and Dollar
        Rolls...............................................     3
       Convertible Securities...............................     4
       Emerging Markets.....................................     5
       Fixed Income Securities..............................     5
       Foreign Currency Exchange Transactions...............     6
       Foreign Securities...................................     7
       Forward Commitments..................................     8
       Interest Rate Transactions...........................     8
       Illiquid Securities..................................    10
       Investment Companies.................................    10
       Lease Obligation Bonds...............................    10
       Lending Portfolio Securities.........................    10
       Lower-Rated Fixed Income Securities..................    11
       Mortgage-Related Securities..........................    12
               Mortgage Pass-Through Securities.............    12
               Collateralized Mortgage Obligations (CMOs)...    13
               Commercial Mortgage-Backed Securities........    14
               Other Mortgage-Related Securities............    15
               CMO Residuals................................    15
               Stripped Mortgage-Backed Securities
              ("SMBS")......................................    16
       Options and Financial Futures Contracts..............    16
               Writing Covered Call and Put Options and
              Purchasing Call and Put Options...............    17
               Financial Futures Contracts..................    19
               Options on Financial Futures Contracts.......    20
               Certain Additional Risks of Options and
              Financial Futures Contracts...................    21
               Limitations..................................    22
       Real Estate Securities and Real Estate Investment
        Trusts ("REITs")....................................    23
       Repurchase Agreements................................    23
       Temporary Defensive Position.........................    24
       Variable or Floating Rate Securities.................    24
       Warrants.............................................    25
       When-issued Securities and Delayed-delivery
        Transactions........................................    25
       Zero-Coupon Fixed Income Securities..................    25
 
INVESTMENT RESTRICTIONS.....................................    26
       Fundamental Investment Restrictions..................    26
       Non-Fundamental Investment Restrictions..............    27
 
MANAGEMENT OF THE TRUST.....................................    28
       Trustees and Officers................................    28
       Controlling Shareholder..............................    30
       Investment Adviser...................................    30
       Investment Sub-Advisers..............................    32
</TABLE>
    
 
                                       ii
<PAGE>   35
 
   
<TABLE>
<CAPTION>
                                                               PAGE
                                                               ----
<S>                                                            <C>
       Trust Administration.................................    34
       Investment Decisions.................................    35
       Brokerage and Research Services......................    35
 
OFFERING, PURCHASE AND REDEMPTION OF FUND SHARES............    36
 
DETERMINATION OF NET ASSET VALUE............................    37
 
ACCOUNTING AND TAX TREATMENT................................    37
       Calls and Puts.......................................    37
       Financial Futures Contracts..........................    37
       Subchapter M of the Internal Revenue Code of 1986....    38
       Section 817(h) of the Code...........................    38
 
DIVIDENDS AND DISTRIBUTIONS.................................    39
 
PERFORMANCE INFORMATION.....................................    40
       Average Annual Total Return..........................    40
       Portfolio Total Return...............................    40
       Index Total Return...................................    40
       Seven Day Yields.....................................    41
 
SHAREHOLDER COMMUNICATIONS..................................    41
 
ORGANIZATION AND CAPITALIZATION.............................    41
 
SHAREHOLDER LIABILITY.......................................    42
 
PORTFOLIO TURNOVER..........................................    42
 
CUSTODIAN...................................................    43
 
INDEPENDENT ACCOUNTANTS.....................................    43
 
DESCRIPTION OF NRSRO RATINGS................................    44
       Description of Moody's Corporate Ratings.............    44
       Description of S&P's Corporate Ratings...............    44
       Description of Duff Corporate Ratings................    45
       Description of Fitch Corporate Ratings...............    45
       Description of Thomson Bankwatch, Inc. Corporate
        Ratings.............................................    46
       Description of IBCA Limited and IBCA Inc. Corporate
        Ratings.............................................    46
       Description of S&P's Commercial Paper Ratings........    47
       Description of Moody's Commercial Paper Ratings......    47
       Description of Duff Commercial Paper Ratings.........    48
       Description of Fitch Commercial Paper Ratings........    48
       Description of IBCA Limited and IBCA Inc. Commercial
        Paper Ratings.......................................    48
       Description of Thomson Bankwatch, Inc. Commercial
        Paper Ratings.......................................    48
 
FINANCIAL STATEMENTS........................................    48
</TABLE>
    
 
                                       iii
<PAGE>   36
 
                               A.G. SERIES TRUST
                      STATEMENT OF ADDITIONAL INFORMATION
 
                                  DEFINITIONS
 
"Adviser"      -- A.G. Investment Advisory Services, Inc., formerly AGA
                  Investment Advisory Services Inc. and prior to that, WNL
                  Investment Advisory Services, Inc., the Trust's investment
                  adviser.
 
"Company"      -- American General Annuity Insurance Company, formerly Western
                  National Life Insurance Company
 
"Sub-adviser"  -- An investment adviser that makes investment decisions for a
                  Portfolio according to the Portfolio's investment objectives
                  and restrictions pursuant to a contractual arrangement with
                  the Adviser.
 
"Trust"        -- A.G. Series Trust, formerly AGA Series Trust and prior to
                  that, WNL Series Trust.
 
"1940 Act"     -- Investment Company Act of 1940, as amended.
 
                              GENERAL INFORMATION
 
The name of the Trust was changed to A.G. Series Trust on March 8, 1999. From
May 1, 1998 to March 8, 1999, the Trust was known as AGA Series Trust. Prior to
this, the Trust was known as WNL Series Trust.
 
Prior to March 8, 1999, the American General U.S. Government Securities
Portfolio was known as the Salomon Brothers U.S. Government Securities
Portfolio. Prior to May 1, 1998, the Credit Suisse Growth and Income Portfolio
was known as the BEA Growth and Income Portfolio. Prior to May 1, 1998, the
EliteValue Portfolio was known as the EliteValue Asset Allocation Portfolio, and
prior to May 1, 1996, the EliteValue Asset Allocation Portfolio was known as the
Quest For Value Asset Allocation Portfolio. Prior to May 1, 1998, the State
Street Global Advisors Growth Equity Portfolio was known as the Global Advisors
Growth Equity Portfolio. Prior to May 1, 1998, the State Street Global Advisors
Money Market Portfolio was known as the Global Advisors Money Market Portfolio.
Prior to October 28, 1998, the Van Kampen Emerging Growth Portfolio was known as
the Van Kampen American Capital Emerging Growth Portfolio, and prior to May 1,
1996, the Van Kampen American Capital Emerging Growth Portfolio was known as the
American Capital Emerging Growth Portfolio.
 
            INVESTMENT STRATEGIES, POLICIES, AND RISKS OF THE TRUST
 
The Trust is a diversified open-end management investment company, which
currently offers shares of beneficial interest of seven series ("the
Portfolios") with separate investment objectives and policies that are described
in the Prospectus. Except as described below under "Investment Restrictions,"
the investment policies described in the Prospectus and here, in the SAI, are
not fundamental, and the Trustees may change them without an affirmative vote of
shareholders of the Portfolio.
 
Each Portfolio, in attempting to achieve its investment objective or policies,
employs a variety of instruments, strategies, and techniques, which are
described in greater detail below. Risks and restrictions associated with these
practices are also described. Policies and limitations are considered at the
time a security or instrument is purchased or a practice is initiated.
Generally, securities need not be sold if subsequent changes in market value
result in applicable limitations not being met.
 
A Portfolio might not buy all of these instruments or use all of these
techniques to the full extent permitted by its investment policies unless the
Adviser or the Sub-adviser, subject to oversight by the Adviser, believes that
doing so will help the Portfolio achieve its goal. Except where otherwise noted,
the investment policies set forth below may be changed at any time without
shareholder consent by vote of the Board of Trustees of the Trust.

                                        1
<PAGE>   37
 
ASSET-BACKED SECURITIES
 
Each Portfolio may invest in asset-backed securities (unrelated to first
mortgage loans) that represent fractional interests in pools of retail
installment loans, both secured (such as certificates for automobile
receivables) and unsecured, and leases, or revolving credit receivables both
secured and unsecured (such as credit card receivable securities). These assets
are generally held by a trust and payments of principal and interest, or
interest only are passed through monthly or quarterly to certificate holders and
may be guaranteed up to certain amounts by letters of credit issued by a
financial institution affiliated or unaffiliated with the trustee or originator
of the trust.
 
Underlying automobile sales contracts, leases or credit card receivables are
subject to prepayment, which may reduce the overall return to certificate
holders. Nevertheless, principal repayment rates tend not to vary much with
interest rates and the short-term nature of the underlying loans, leases, or
receivables tends to dampen the impact of any change in the prepayment level.
Certificate holders may also experience delays in payment on the certificates if
the full amounts due on underlying loans, leases or receivables are not realized
by the trust because of unanticipated legal or administrative costs of enforcing
the contracts or because of depreciation or damage to the collateral (usually
automobiles) securing certain contracts, or other factors. If consistent with
its investment objective(s) and policies, each Portfolio may invest in other
asset-backed securities that may be developed in the future.
 
BANK OBLIGATIONS
 
Each Portfolio may invest in bank obligations. Bank obligations in which the
Portfolios may invest include certificates of deposit, bankers' acceptances, and
fixed time deposits. Certificates of deposit are negotiable certificates issued
against funds deposited in a commercial bank for a definite period of time and
earning a specified return. Bankers' acceptances are negotiable drafts or bills
of exchange, normally drawn by an importer or exporter to pay for specific
merchandise, which are "accepted" by a bank, meaning, in effect, that the bank
unconditionally agrees to pay the face value of the instrument on maturity.
Fixed time deposits are bank obligations payable at a stated maturity date and
bearing interest at a fixed rate. Fixed time deposits may be withdrawn on demand
by the investor, but may be subject to early withdrawal penalties which vary
depending upon market conditions and the remaining maturity of the obligation.
There are no contractual restrictions on the right to transfer a beneficial
interest in a fixed time deposit to a third party, although there is no market
for such deposits. A Portfolio will not invest in fixed time deposits which (1)
are not subject to prepayment or (2) provide for withdrawal penalties upon
prepayment (other than overnight deposits) if, in the aggregate, more than 15%
of its net assets (10% in the case of the Money Market Portfolio), would be
invested in such deposits, repurchase agreements maturing in more than seven
days and other illiquid assets.
 
The Portfolios limit investments in United States bank obligations to
obligations of U.S. banks (including foreign branches) which have more than $1
billion in total assets at the time of investment and are members of the Federal
Reserve System or are examined by the Comptroller of the Currency or whose
deposits are insured by the Federal Deposit Insurance Corporation. A Portfolio
also may invest in certificates of deposit of savings and loan associations
(federally or state chartered and federally insured) having total assets in
excess of $1 billion. Each Portfolio also may invest in Eurodollar Certificates
of Deposit, which are U.S. dollar-denominated certificates of deposit issued by
foreign branches of U.S. banks.
 
The Portfolios limit investments in foreign bank obligations to U.S. dollar-or
foreign currency-denominated obligations of foreign banks (including United
States branches of foreign banks) which at the time of investment (i) have more
than $10 billion, or the equivalent in other currencies, in total assets; (ii)
in terms of assets are among the 75 largest foreign banks in the world; (iii)
have branches or agencies (limited purpose offices which do not offer all
banking services) in the United States; and (iv) in the opinion of the Adviser
or a Sub-adviser, are of an investment quality comparable to obligations of
United States banks in which the Portfolios may invest. These obligations
include, for example, Eurodollar Time Deposits, which are U.S.
dollar-denominated deposits in foreign branches of U.S. and foreign banks and
Yankee Certificates of Deposit, which are U.S. dollar-denominated certificates
of deposit issued by U.S. branches of foreign banks. Subject to a Portfolio's
limitation on concentration in the securities of issuers in a particular
industry, there is
 
                                        2
<PAGE>   38
 
no limitation on the amount of a Portfolio's assets which may be invested in
obligations of foreign banks which meet the conditions set forth herein.
 
Obligations of foreign banks involve somewhat different investment risks than
those affecting obligations of United States banks, including the possibilities
that their liquidity could be impaired because of future political and economic
developments, that their obligations may be less marketable than comparable
obligations of United States banks, that a foreign jurisdiction might impose
withholding taxes on interest income payable on those obligations, that foreign
deposits may be seized or nationalized, that foreign governmental restrictions
such as exchange controls may be adopted which might adversely affect the
payment of principal and interest on those obligations and that the selection of
those obligations may be more difficult because there may be less publicly
available information concerning foreign banks or the accounting, auditing and
financial reporting standards, practices and requirements applicable to foreign
banks may differ from those applicable to United States banks. Foreign banks are
not generally subject to examination by any U.S. Government agency or
instrumentality.
 
BORROWING, REVERSE REPURCHASE AGREEMENTS AND DOLLAR ROLLS
 
   
Each Portfolio may, subject to its investment restrictions, borrow money for
temporary emergency purposes. In addition, the Money Market Portfolio may borrow
to facilitate redemptions. This borrowing may be unsecured. The Portfolios may
borrow only from banks. Provisions of the 1940 Act require a Portfolio to
maintain continuous asset coverage (that is, total assets including borrowings,
less liabilities exclusive of borrowings) of 300% of the amount borrowed, with
an exception for borrowings not in excess of 5% of the Portfolio's total assets
made for temporary administrative purposes. Any borrowings for temporary
administrative purposes in excess of 5% of the Portfolio's total assets must
maintain continuous asset coverage. If the 300% asset coverage should decline as
a result of market fluctuations or other reasons, a Portfolio may be required to
sell some of its portfolio holdings within three days to reduce the debt and
restore the 300% asset coverage, even though it may be disadvantageous from an
investment standpoint to sell securities at that time. As noted below, certain
Portfolios also may enter into certain transactions, including reverse
repurchase agreements, dollar rolls (usually mortgage-backed), and
sale-buybacks, that can be viewed as constituting a form of borrowing or
financing transaction by the Portfolio. To the extent a Portfolio covers its
commitment under a reverse repurchase agreement (or economically similar
transaction) by the segregation of assets equal in value to the amount of the
Portfolio's commitment to repurchase, such an agreement will not be considered a
"senior security" by the Portfolio and therefore will not be subject to the 300%
asset coverage requirement otherwise applicable to borrowings by the Portfolios.
Borrowing will tend to exaggerate the effect on net asset value of any increase
or decrease in the market value of a Portfolio's portfolio. Money borrowed will
be subject to interest costs which may or may not be recovered by appreciation
of the securities purchased. A Portfolio also may be required to maintain
minimum average balances in connection with such borrowing or to pay a
commitment or other fee to maintain a line of credit; either of these
requirements would increase the cost of borrowing over the stated interest rate.
    
 
   
In addition to borrowing for temporary purposes, certain Portfolios may enter
into reverse repurchase agreements, dollar rolls (usually mortgage-backed), and
economically similar transactions. A reverse repurchase agreement involves the
sale of a portfolio-eligible security by a Portfolio, coupled with its agreement
to repurchase the instrument at a specified time and price. Under a reverse
repurchase agreement, the Portfolio continues to receive any principal and
interest payments on the underlying security during the term of the agreement.
The Portfolio typically will segregate assets determined to be liquid by the
Adviser or a Sub-adviser equal (on a daily mark-to-market basis) to its
obligations under reverse repurchase agreements. However, reverse repurchase
agreements involve the risk that the market value of securities retained by the
Portfolio may decline below the repurchase price of the securities sold by the
Portfolio which it is obligated to repurchase. To the extent that positions in
reverse repurchase agreements are not covered through the segregation of liquid
assets at least equal to the amount of any forward purchase commitment, such
transactions would be subject to the Portfolios' limitations on borrowings.
    
 
   
Certain Portfolios seeking a high level of current income may enter into dollar
rolls and "covered rolls" in which the Portfolio sells securities (usually
mortgage-backed securities) and simultaneously contracts to
    
                                        3
<PAGE>   39
 
   
purchase, typically in 30 to 60 days, substantially similar but not identical,
securities on a specified future date. The proceeds of the initial sale of
securities in such transactions may be used to purchase long-term securities
that will be held during the roll period. During the roll period, the Portfolio
forgoes principal and interest paid on the securities sold at the beginning of
the roll period. The Portfolio is compensated by the difference between the
current sales price and the forward price for the future purchase (often
referred to as the "drop"), as well as by the interest earned on the cash
proceeds of the initial sale. A "covered roll" is a specific type of dollar roll
for which there is an offsetting cash position or cash equivalent securities
position that matures on or before the forward settlement date of the dollar
roll transaction. As used herein, the term "dollar roll" refers to dollar rolls
that are not "covered rolls." At the end of the roll commitment period, the
Portfolio may or may not take delivery of the securities the Portfolio has
contracted to purchase.
    
 
   
A Portfolio will segregate cash, U.S. government securities, or other liquid
high-grade debt obligations equal in value at all times to its obligations in
respect of dollar rolls, and accordingly, the Portfolio will not treat such
obligations as senior securities for purposes of the 1940 Act. "Covered rolls"
are not subject to these segregation requirements. Dollar rolls and covered
rolls may be considered borrowings and are, therefore, subject to the borrowing
limitations applicable to the Portfolios, except that dollar rolls (including
covered rolls) shall not be considered to be "borrowed funds" for purposes of
the 5% limitation described under "Borrowings" above. Dollar rolls involve the
risk that the market value of the securities the Portfolio is obligated to
repurchase under the agreement may decline below the repurchase price. In the
event the buyer of securities under a dollar roll files for bankruptcy or
becomes insolvent, the Portfolio's use of proceeds of the dollar roll may be
restricted, pending a determination by the other party, or its trustee or
receiver, whether to enforce the Portfolio's obligation to repurchase the
securities.
    
 
As a matter of operating policy, no Portfolio will borrow more than 10% of its
total net asset value when borrowing for general purposes, and no Portfolio will
borrow an amount equal to more than 25% of its total net asset value when
borrowing as a temporary measure or to facilitate redemptions. For these
purposes, net asset value is the market value of all investments or assets, less
outstanding liabilities at the time that the new or additional borrowing is
undertaken. Also, for these purposes, securities purchased on a when-issued or
delayed delivery basis and short sales of securities are considered borrowing.
Reverse repurchase agreements and dollar rolls (including covered rolls) are not
considered borrowing for purposes of this operating policy. A Portfolio will not
purchase investments once borrowed funds (including reverse repurchase
agreements) exceed 5% of its total assets, except that dollar rolls (including
covered rolls) shall not be considered to be "borrowed funds" for purposes of
the 5% limitation.
 
CONVERTIBLE SECURITIES
 
Each Portfolio, other than the Money Market Portfolio and the U.S. Government
Securities Portfolio may invest in convertible securities of foreign or domestic
issuers. A convertible security is a security (a bond or preferred stock) which
may be converted at a stated price within a specified period of time into a
certain quantity of the common stock of the same or a different issuer.
Convertible securities are senior to common stocks in a corporation's capital
structure but are usually subordinated to similar nonconvertible securities.
Convertible securities provide, through their conversion feature, an opportunity
to participate in capital appreciation resulting from a market price advance in
a convertible security's underlying common stock. The price of a convertible
security is influenced by the market value of the underlying common stock and
tends to increase as the market value of the underlying stock rises, whereas it
tends to decrease as the market value of the underlying stock declines.
 
A Portfolio may be required to permit the issuer of a convertible security to
redeem the security, convert it into the underlying common stock, or sell it to
a third party. Thus, a Portfolio may not be able to control whether the issuer
of a convertible security chooses to convert that security. If the issuer
chooses to do so, this action could have an adverse effect on a Portfolio's
ability to achieve its investment objectives.
 
To the extent that convertible securities are intended by a Portfolio to be
equity securities, the following equity quality criteria typically are
considered: industry prospects (growth rate, competitive pressures,
supply/demand characteristics), market valuations (including price-to-book
ratios, price-earnings ratios and
 
                                        4
<PAGE>   40
 
return on equity), company profile (suppliers, competitors, end-users and
customers), discretionary cash flow and quality of management. To the extent
that convertible securities are intended by a Portfolio to be fixed income
securities, the quality criteria typically applied by the Portfolio to
investments in fixed income securities (i.e., Moody's Investors Service, Inc.
("Moody's") and Standard & Poors Corporation ("S&P") ratings) are applied.
 
EMERGING MARKETS
 
The International Equity Portfolio, the Growth Equity Portfolio and the
EliteValue Portfolio may invest in companies domiciled in emerging market
countries which may be subject to additional risks. Specifically, volatile
social, political and economic conditions may expose investments in emerging or
developing markets to economic structures that are generally less diverse and
mature. Emerging market countries may have less stable political systems than
those of more developed countries. As a result, it is possible that favorable
economic developments in certain emerging market countries may be suddenly
slowed or reversed by unanticipated political or social events in such
countries. Moreover, the economies of individual emerging market countries may
differ favorably or unfavorably from the U.S. economy in such respects as the
rate of growth in gross domestic product, the rate of inflation, capital
reinvestment, resource self-sufficiency and balance of payments position.
 
Another risk is that the small current size of the markets for such securities
and the currently low or nonexistent volume of trading can result in a lack of
liquidity and in greater price volatility. Until recently, there has been an
absence of a capital market structure or market-oriented economy in certain
emerging market countries. If a Portfolio's securities will generally be
denominated in foreign currencies, the value of such securities to the Portfolio
will be affected by changes in currency exchange rates and in exchange control
regulations. A change in the value of a foreign currency against the U.S. dollar
will result in a corresponding change in the U.S. dollar value of a Portfolio's
securities. In addition, some emerging market countries may have fixed or
managed currencies which are not free-floating against the U.S. dollar. Further,
certain emerging market currencies may not be internationally traded. Certain of
these currencies have experienced a steady devaluation relative to the U.S.
dollar. Many emerging markets countries have experienced substantial, and in
some periods extremely high, rates of inflation for many years. Inflation and
rapid fluctuations in inflation rates have had, and may continue to have,
negative effects on the economies and securities markets of certain emerging
market countries.
 
A further risk is that the existence of national policies may restrict a
Portfolio's investment opportunities and may include restrictions on investment
in issuers or industries deemed sensitive to national interests. Also, some
emerging markets countries may not have developed structures governing private
or foreign investment and may not allow for judicial redress for injury to
private property.
 
These securities are subject to the risks of investing in foreign investments in
general, which include the risk that the value of the securities and currencies
will decline as a result of economic, political or market conditions. In
addition, the risk exists that an issuer may be unable to make interest or
principal payments. Furthermore, the extent to which supranational organizations
may guarantee such investments may be different than the guarantees provided by
the U.S. government on its obligations.
 
FIXED INCOME SECURITIES
 
Fixed income securities consist of bonds, notes, debentures, and other
interest-bearing securities that represent indebtedness.
 
Fixed income securities are considered high quality if they are rated at least A
by Moody's or its equivalent by any other Nationally Recognized Statistical
Rating Organization ("NRSRO") or, if unrated, are determined to be of equivalent
investment quality. High quality fixed income securities are considered to have
a very strong capacity to pay principal and interest. Fixed income securities
are considered investment grade if they
 
                                        5
<PAGE>   41
 
are rated, for example, at least Baa by Moody's or BBB by S&P or their
equivalents by any other NRSRO or, if not rated, are determined to be of
equivalent investment quality. Investment grade fixed income securities are
regarded as having an adequate capacity to pay principal and interest. Lower
rated securities, for example, Ba by Moody's or its equivalent by any other
NRSRO are regarded on balance as high risk and predominantly speculative with
respect to the issues continuing ability to meet principal and interest
payments. See "Lower-Rated Fixed Income Securities" herein.
 
The maturity of fixed income securities may be considered long (ten plus years),
intermediate (one to ten years), or short-term (thirteen months or less). In
general, the principal values of longer-term securities fluctuate more widely in
response to changes in interest rates than those of shorter-term securities,
providing greater opportunity for capital gain or risk of capital loss. A
decline in interest rates usually produces an increase in the value of fixed
income securities, while an increase in interest rates generally reduces their
value.
 
FOREIGN CURRENCY EXCHANGE TRANSACTIONS
 
Foreign currency transactions used by the EliteValue Portfolio, the Growth and
Income Portfolio and the International Equity Portfolio may be either: (i) on
the spot (i.e., cash) basis at the spot rate prevailing in the foreign exchange
market, or (ii) conducted through the use of forward foreign currency exchange
contracts. A forward foreign currency exchange contract involves an obligation
to purchase or sell a specific currency at a future date. In general, forward
foreign currency exchange contracts are not guaranteed by a third party and,
accordingly, each party to a forward foreign currency exchange contract is
dependent upon the creditworthiness and good faith of the other party.
 
A Portfolio may enter into foreign currency exchange transactions for hedging
purposes as well as for non-hedging purposes. Transactions are entered into for
hedging purposes in an attempt to protect the dollar value of the Portfolio
against adverse changes in foreign currency exchange rates between the trade and
settlement dates of specific securities transactions or changes in foreign
currency exchange rates that would adversely affect a portfolio position or an
anticipated portfolio position. Although these transactions tend to minimize the
risk of loss due to a decline in the value of the hedged currency, at the same
time they tend to limit any potential gain that might be realized should the
value of the hedged currency increase. The precise matching of the forward
contract amounts and the value of the securities involved will not generally be
possible because the future value of these securities in foreign currencies will
change as a consequence of market movements in the value of those securities
between the date the forward contract is entered into and the date it matures.
The projection of currency market movements is extremely difficult, and the
successful execution of a hedging strategy is highly uncertain. In addition,
when the Sub-adviser believes that the currency of a specific country may
deteriorate against another currency, it may enter into a forward contract to
sell the less attractive currency and buy the more attractive one. The amount in
question could be less than or equal to the value of the Portfolio's securities
denominated in the less attractive currency. The Portfolio may also enter into a
forward contract to sell a currency that is linked to a currency or currencies
in which some or all of the Portfolio's portfolio securities are or could be
denominated, and to buy U.S. dollars. These practices are referred to as "cross
hedging" and "proxy hedging."
 
A Portfolio may enter into foreign currency exchange transactions for other than
hedging purposes, which presents greater profit potential, but also involves
increased risk. For example, if the Sub-adviser believes that the value of a
particular foreign currency will increase or decrease relative to the value of
the U.S. dollar, the Portfolio may purchase or sell such currency, respectively,
through a forward foreign currency exchange contract. If the expected changes in
the value of the currency occur, the Portfolio will realize profits, which will
increase its gross income. Where exchange rates do not move in the direction or
to the extent anticipated, however, the Portfolio may sustain losses that will
reduce its gross income. Such transactions, therefore, could be considered
speculative.
 
Forward currency exchange contracts are agreements to exchange one currency for
another -- for example, to exchange a certain amount of U.S. dollars for a
certain amount of Japanese yen -- at a future date and specified price.
Typically, the other party to a currency exchange contract will be a commercial
bank or other
 
                                        6
<PAGE>   42
 
financial institution. Because there is a risk of loss to the Portfolio if the
other party does not complete the transaction, the Portfolio's Sub-adviser will
enter into foreign currency exchange contracts only with parties approved by the
Trust's Trustees.
 
A Portfolio may maintain "short" positions in forward currency exchange
transactions in which the Portfolio agrees to exchange currency that it
currently does not own for another currency, for example, to exchange an amount
of Japanese yen that it does not own for a certain amount of U.S. dollars, at a
future date and specified price in anticipation of a decline in the value of the
currency sold short relative to the currency that the Portfolio has contracted
to receive in the exchange.
 
While such actions are intended to protect the Portfolio from adverse currency
movements, there is a risk that currency movements involved will not be properly
anticipated. Use of this technique may also be limited by management's need to
protect the status of the Portfolio as a regulated investment company under the
Internal Revenue Code of 1986 ("the Code"), as amended. The projection of
currency market movements is extremely difficult, and the successful execution
of currency strategies is highly uncertain.
 
FOREIGN SECURITIES
 
Each Portfolio, other than the U.S. Government Securities Portfolio, may invest
in foreign securities. A foreign security includes equity and corporate debt
securities of foreign issuers (including preferred or preference stock), certain
foreign bank obligations (see "Bank Obligations"), commercial paper of foreign
companies, and U.S. dollar or foreign currency-denominated obligations of
foreign governments or their subdivisions, agencies and instrumentalities,
international agencies and supranational entities.
 
Included within the definition of foreign securities are the following
depository receipts: American Depository Receipts (ADRs), European Depositary
Receipts (EDRs), International Depository Receipts (IDRs) and Global Depository
Receipts (GDRs).
 
ADRs are certificates issued by a United States bank or trust company and
represent the right to receive securities of a foreign issuer deposited in a
domestic bank or foreign branch of a United States bank and traded on a United
States exchange or in an over-the-counter market. Generally, ADRs are in
registered form. Investment in ADRs has certain advantages over direct
investment in the underlying foreign securities since: (i) ADRs are U.S.
dollar-denominated investments that are easily transferable and for which market
quotations are readily available, and (ii) issuers whose securities are
represented by ADRs are generally subject to auditing, accounting and financial
reporting standards similar to those applied to domestic issuers. EDRs, IDRs and
GDRs are receipts evidencing an arrangement with a non-U.S. bank similar to that
for ADRs and are designed for use in the non-U.S. securities markets. EDRs and
GDRs are not necessarily quoted in the same currency as the underlying security.
In addition, certain Portfolios may invest in other types of depositary
securities such as international depository receipts, global depository shares,
European depository shares and international depository shares.
 
Each Portfolio, other than the Money Market Portfolio and the U.S. Government
Securities Portfolio, also may invest assets in debt securities issued or
guaranteed by supranational organizations. These securities include obligations
issued or guaranteed by the Asian Development Bank, InterAmerican Development
Bank, International Bank for Reconstruction and Development (World Bank),
African Development Bank, European Coal and Steel Community, European Economic
Community, European Investment Bank, and the Nordic Investment Bank. The
EliteValue Portfolio may invest in these securities provided they are listed on
a domestic or foreign securities exchange or represented by ADRs that are listed
on a domestic securities exchange or traded in domestic or foreign
over-the-counter markets. The Growth Equity Portfolio may invest in these
securities only to the extent that they are denominated in U.S. dollars.
 
A Portfolio may also, in accordance with its specific investment objective(s)
and investment program, policies and restrictions purchase U.S.
dollar-denominated money market securities of foreign issuers. Such money market
securities may be registered domestically and traded on domestic exchanges or in
the over-the-counter market (e.g., Yankee securities) or may be (1) registered
abroad and traded exclusively in foreign markets or (2) registered domestically
and issued in foreign markets (e.g., Eurodollar securities).
 
                                        7
<PAGE>   43
 
   
In addition, the International Equity Portfolio, the Emerging Growth Portfolio
and the Growth and Income Portfolio may invest in non-U.S. dollar-denominated
foreign securities, in accordance with their specific investment objective(s),
investment programs, policies, and restrictions. Investing in foreign securities
may involve advantages and disadvantages not present in domestic investments.
There may be less publicly available information about securities not registered
domestically, or their issuers, than is available about domestic issuers or
their domestically registered securities. Stock markets outside the U.S. may not
be as developed as domestic markets, and there may also be less government
supervision of foreign exchanges and brokers. Foreign securities may be less
liquid or more volatile than U.S. securities. Trade settlements may be slower
and could possibly be subject to failure. In addition, brokerage commissions and
custodial costs with respect to foreign securities may be higher than those for
domestic investments. Accounting, auditing, financial reporting and disclosure
standards for foreign issuers may be different than those applicable to domestic
issuers. Non-U.S. dollar-denominated foreign securities may be affected
favorably or unfavorably by changes in currency exchange rates and exchange
control regulations (including currency blockage) and a Portfolio may incur
costs in connection with conversions between various currencies. Foreign
securities may also involve risks due to changes in the political or economic
conditions of such foreign countries, the possibility of expropriation of assets
or nationalization, and possible difficulty in obtaining and enforcing judgments
against foreign entities.
    
 
   
Euro Conversion. Austria, Belgium, Finland, France, Germany, Ireland, Italy,
Luxembourg, the Netherlands, Portugal, and Spain are members of the European
Economic and Monetary Union (the "EMU"). The EMU has established a common
European currency for participating countries which will be known as the "euro."
Each participating country has supplemented its existing currency with the euro
on January 1, 1999, and will replace its existing currency with the euro on July
1, 2002. Any other European country which is a member of the EMU may elect to
participate in the EMU and may supplement its existing currency with the euro
after January 1, 1999.
    
 
The expected introduction of the euro presents unique risks and uncertainties,
including whether the payment and operational systems of banks and other
financial institutions will function properly; how outstanding financial
contracts will be treated after January 1, 1999; the establishment of exchange
rates for existing currencies and the euro; and the creation of suitable
clearing and settlement systems for the euro. These and other factors could
cause market disruptions and could adversely affect the value of securities held
by certain of the Portfolios.
 
FORWARD COMMITMENTS
 
Each Portfolio may enter into contracts to purchase securities for a fixed price
at a future date beyond customary settlement time ("forward commitments") if the
Portfolio holds, and maintains until the settlement date in a segregated account
maintained by the Custodian with assets selected by the Custodian, cash or
high-grade debt obligations in an amount sufficient to meet the purchase price,
or if the Portfolio enters into offsetting contracts for the forward sale of
other securities it owns.
 
Forward commitments may be considered securities in themselves, and involve a
risk of loss if the value of the security to be purchased declines prior to the
settlement date, which risk is in addition to the risk of decline in the value
of the Portfolio's other assets. Where such purchases are made through dealers,
the Portfolio relies on the dealer to consummate the sale. The dealer's failure
to do so may result in the loss to the Portfolio of an advantageous yield or
price.
 
Although a Portfolio will generally enter into forward commitments with the
intention of acquiring securities for its portfolio or for delivery pursuant to
options contracts it has entered into, a Portfolio may dispose of a commitment
prior to settlement if a Portfolio's Sub-adviser deems it appropriate to do so.
A Portfolio may realize short-term profits or losses upon the sale of forward
commitments.
 
INTEREST RATE TRANSACTIONS
 
Each Portfolio, other than the Money Market Portfolio, may engage in various
interest rate transactions, such as swaps, caps, floors, and collars.
                                        8
<PAGE>   44
 
Interest rate, index and currency exchange rate swap agreements are entered into
in an attempt to obtain a particular return when it is considered desirable to
do so, possibly at a lower cost to the Portfolio than if the Portfolio had
invested directly in an instrument that yielded that desired return. Swap
agreements are two party contracts entered into primarily by institutional
investors for periods ranging from a few weeks to more than one year. In a
standard "swap" transaction, two parties agree to exchange the returns (or
differentials in rates of return) earned or realized on particular predetermined
investments or instruments, which may be adjusted for an interest factor. The
gross returns to be exchanged or "swapped" between the parties are generally
calculated with respect to a "notional amount," i.e., the return on or increase
in value of a particular dollar amount invested at a particular interest rate,
in a particular foreign currency, or in a "basket" of securities representing a
particular index. Forms of swap agreements include interest rate caps, under
which, in return for a premium, one party agrees to make payments to the other
to the extent that interest rates exceed a specified rate, or "cap"; interest
rate floors, under which, in return for a premium, one party agrees to make
payments to the other to the extent that interest rates fall below a specified
rate, or "floor"; and interest rate collars, under which a party sells a cap and
purchases a floor or vice versa in an attempt to protect itself against interest
rate movements exceeding minimum or maximum levels.
 
   
Most swap agreements entered into by the Portfolios would calculate the
obligations of the parties to the agreement on a "net basis." Consequently, a
Portfolio's current obligations (or rights) under a swap agreement will
generally be equal only to the net amount to be paid or received under the
agreement based on the relative values of the positions held by each party to
the agreement (the "net amount"). A Portfolio's current obligations under a swap
agreement will be accrued daily (offset against any amounts owing to the
Portfolio) and any accrued but unpaid net amounts owed to a swap counterparty
will be covered by the segregation of assets determined to be liquid by the
Adviser or a Sub-adviser to avoid any potential leveraging of a Portfolio's
portfolio. Obligations under swap agreements so covered will not be construed to
be "senior securities" for purposes of the Portfolio's investment restriction
concerning senior securities. A Portfolio will not enter into a swap agreement
with any single party if the net amount owed or to be received under existing
contracts with that party would exceed 5% of the Portfolio's assets.
    
 
Whether a Portfolio's use of swap agreements will be successful in furthering
its investment objective will depend on the Adviser's or a Sub-adviser's ability
to predict correctly whether certain types of investments are likely to produce
greater returns than other investments. Because they are two party contracts and
because they may have terms of greater than seven days, swap agreements may be
considered to be illiquid. Moreover, a Portfolio bears the risk of loss of the
amount expected to be received under a swap agreement in the event of the
default or bankruptcy of a swap agreement counterparty. The Portfolios will
enter into swap agreements only with counterparties that meet certain standards
of creditworthiness (generally, such counterparties would have to be eligible
counterparties under the terms of the Portfolio's repurchase agreement
guidelines). Certain restrictions imposed on the Portfolios by the Code may
limit the Portfolios' ability to use swap agreements. The swaps market is a
relatively new market and is largely unregulated. It is possible that
developments in the swaps market, including potential government regulation,
could adversely affect a Portfolio's ability to terminate existing swap
agreements or to realize amounts to be received under such agreements.
 
Certain swap agreements are exempt from most provisions of the Commodity
Exchange Act ("CEA") and, therefore, are not regulated as futures or commodity
option transactions under the CEA, pursuant to regulations approved by the CFTC
effective February 22, 1993. To qualify for this exemption, a swap agreement
must be entered into by "eligible participants," which include the following,
provided the participants' total assets exceed established levels: a bank or
trust company, savings association or credit union, insurance company,
investment company subject to regulation under the 1940 Act, commodity pool,
corporation, partnership, proprietorship, organization, trust or other entity,
employee benefit plan, governmental entity, broker-dealer, futures commission
merchant, natural person, or regulated foreign person. To be eligible, natural
persons and most other entities must have total assets exceeding $10 million;
commodity pools and employee benefit plans must have assets exceeding $5
million. In addition, an eligible swap transaction must meet three conditions.
First, the swap agreement may not be part of a fungible class of agreements that
are standardized as to their material economic terms. Second, the
creditworthiness of parties with actual or
 
                                        9
<PAGE>   45
 
potential obligations under the swap agreement must be a material consideration
in entering into or determining the terms of the swap agreement, including
pricing, cost or credit enhancement terms. Third, swap agreements may not be
entered into and traded on or through a multilateral transaction execution
facility.
 
This exemption is not exclusive, and participants may continue to rely on
existing exclusions for swaps, such as the Policy Statement issued in July 1989
which recognized a safe harbor for swap transactions from regulation as futures
or commodity option transactions under the CEA or its regulations. The Policy
Statement applies to swap transactions settled in cash that (1) have
individually tailored terms, (2) lack exchange-style offset and the use of a
clearing organization or margin system, (3) are undertaken in conjunction with a
line of business, and (4) are not marketed to the public.
 
ILLIQUID SECURITIES
 
The Portfolios will not invest more than 15% (10% in the case of the Money
Market Portfolio), of the value of their net assets in securities or other
investments that are illiquid or not readily marketable, including, where
applicable: (a) repurchase agreements with maturities exceeding seven days; (b)
time deposits maturing in more than seven calendar days; (c) to the extent a
liquid secondary market does not exist for the instruments, futures contracts,
and options thereon (except for the Money Market Portfolio); (d) certain
over-the-counter options, as described herein; (e) certain variable rate demand
notes having a demand period of more than seven days; and (f) securities, the
disposition of which is restricted under federal securities laws (excluding Rule
144A securities, described below). The Portfolios will not include, for purposes
of the restrictions on illiquid investments, securities sold pursuant to Rule
144A under the Securities Act of 1933, as amended (the "1933 Act"), so long as
such securities meet liquidity guidelines established by the Trustees of the
Trust. Under Rule 144A, securities that would otherwise be restricted may be
sold by persons other than issuers or dealers to qualified institutional buyers.
Securities received as a result of a corporate reorganization or similar
transaction affecting readily-marketable securities already held in the
portfolio of a Portfolio will not be considered securities or other investments
that are not readily marketable. However, the Portfolios will attempt, in an
orderly fashion, to dispose of any securities received under these
circumstances, to the extent that such securities are considered not readily
marketable, and together with other illiquid securities, exceed 15% (or 10% as
noted above) of the value of a Portfolio's net assets.
 
INVESTMENT COMPANIES
 
Each Portfolio may invest in the securities of other open-end or closed-end
investment companies subject to the limitations imposed by the 1940 Act. A
Portfolio will indirectly bear its proportionate share of any management fees
and other expenses paid by an investment company in which it invests.
 
LEASE OBLIGATION BONDS
 
Each Portfolio is authorized to invest in lease obligation bonds. Lease
obligation bonds are mortgages on a facility that are secured by the facility
and are paid by a lessee over a long term. The rental stream to service the
debt, as well as the mortgage, are held by a collateral trustee on behalf of the
public bondholders.
 
The primary risk of such instrument is the risk of default. Under the lease
indenture, the failure to pay rent is an event of default. The remedy to cure
default is to rescind the lease and sell the assets. If the lease obligation is
not readily marketable or market quotations are not readily available, such
lease obligations will be subject to a Portfolio's limit on illiquid securities.
 
LENDING PORTFOLIO SECURITIES
 
All Portfolios have the ability to lend portfolio securities to brokers and
other financial organizations subject to certain conditions: (a) the aggregate
market value of these loans, if and when made, may not exceed 20% (except 10%
with respect to the EliteValue Portfolio, 15% with respect to the International
Equity Portfolio, and 33 1/3% with respect to the Money Market Portfolio and the
Growth Equity Portfolio) of a Portfolio's total assets taken at value; (b) loans
must be secured continuously by collateral consisting of cash, letters of
credit,
                                       10
<PAGE>   46
 
or U.S. Government securities that are maintained at all times in an amount at
least equal to the current market value of the loaned securities; (c) the Trust
will receive any interest or dividends paid on the loaned securities; and (d)
the Trust may, at any time, call the loan and regain the securities involved.
 
Securities loans are made to broker-dealers and other financial institutions
approved by State Street Bank and Trust Company (the "Custodian"), custodian to
the Portfolios. The Adviser will monitor the activities of the Custodian as
authorized by the Board of Trustees. The collateral received will consist of
cash, U.S. Government securities, letters of credit or such other collateral as
permitted by interpretations or rules of the Securities and Exchange Commission
("SEC"). While the securities are on loan, the Portfolios will continue to
receive the equivalent of the interest or dividends paid by the issuer on the
securities, as well as interest on the investment of the collateral or a fee
from the borrower.
 
Any loan of portfolio securities by any Portfolio will be callable at any time
by the lending Portfolio upon notice of five business days. When voting or
consent rights which accompany loaned securities pass to the borrower, the
lending Portfolio will call the loan, in whole or in part as appropriate, to
permit the exercise of such rights if the matters involved would have a material
effect on that Portfolio's investment in the securities being loaned. If the
borrower fails to maintain the requisite amount of collateral, the loan will
automatically terminate, and the lending Portfolio will be permitted to use the
collateral to replace the securities while holding the borrower liable for any
excess of replacement cost over collateral. As with any extensions of credit,
there are risks of delay in receiving additional collateral or in the recovery
of the securities or, in some cases, even loss of rights in the collateral
should the borrower of the securities fail financially. However, these loans of
portfolio securities will be made only when the Custodian, as monitored by the
Adviser, considers the borrowing broker-dealers or financial institutions to be
creditworthy and of good standing and the interest earned from such loans to
justify the attendant risks. On termination of the loan, the borrower will be
required to return the securities to the lending Portfolio. Any gain or loss in
the market price during the loan would inure to the lending Portfolio. The
lending Portfolio may pay reasonable finders', administrative, and custodial
fees in connection with a loan of its securities.
 
LOWER-RATED FIXED INCOME SECURITIES
 
The EliteValue Portfolio and the Growth and Income Portfolio may invest in
lower-rated and non-rated fixed income securities (commonly known as "junk
bonds"). Issuers of lower rated or non-rated securities may be highly leveraged
or newly formed and may not have available to them more traditional methods of
financing. Therefore, the risks associated with acquiring the securities of such
issuers generally are greater than is the case with higher rated securities. For
example, during an economic downturn or a sustained period of rising interest
rates, issuers of high yield securities may be more likely to experience
financial stress, especially if such issuers are highly leveraged. During such
periods, such issuers may not have sufficient revenues to meet their interest
payment obligations. The issuer's ability to service its debt obligations also
may be adversely affected by specific issuer developments, or the issuer's
inability to meet specific projected business forecasts, or the unavailability
of additional financing. The risk of loss due to default by the issuer is
significantly greater for the holders of lower rated securities because such
securities may be unsecured and may be subordinated to other creditors of the
issuer.
 
Lower rated securities frequently have call or redemption features which would
permit an issuer to repurchase the security from a Portfolio. If a call were
exercised by the issuer during a period of declining interest rates, a Portfolio
likely would have to replace such called security with a lower yielding
security, thus decreasing the net investment income to a Portfolio and dividends
to shareholders.
 
A Portfolio may have difficulty disposing of certain lower rated securities
because there may be a thin trading market for such securities. The secondary
trading market for high yield securities is generally not as liquid as the
secondary market for higher rated securities. Reduced secondary market liquidity
may have an adverse impact on market price and a Portfolio's ability to dispose
of particular issues when necessary to meet a Portfolio's liquidity needs or in
response to a specific economic event such as a deterioration in the
creditworthiness of the issuer.
 
                                       11
<PAGE>   47
 
Adverse publicity and investor perceptions, which may not be based on
fundamental analysis, also may decrease the value and liquidity of lower rated
securities, particularly in a thinly traded market. Factors adversely affecting
the market value of lower rated securities are likely to adversely affect a
Portfolio's net asset value. In addition, a Portfolio may incur additional
expenses to the extent it is required to seek recovery upon a default on a
portfolio holding or participate in the restructuring of the obligation.
 
Finally, there are risks involved in applying credit ratings as a method for
evaluating lower rated fixed income securities. For example, credit ratings
evaluate the safety of principal and interest payments, not the market risks
involved in lower rated fixed income securities. Since credit rating agencies
may fail to change the credit ratings in a timely manner to reflect subsequent
events, the Sub-adviser will monitor the issuers of lower rated fixed income
securities in a Portfolio to determine if the issuers will have sufficient cash
flow and profits to meet required principal and interest payments, and to assure
the debt securities' liquidity within the parameters of the Portfolio's
investment policies. The Sub-advisers will not necessarily dispose of a
portfolio security when its ratings have been changed.
 
MORTGAGE-RELATED SECURITIES
 
Each Portfolio, other than the International Equities Portfolio, may invest in
certain types of mortgage-related securities. Mortgage-related securities are
interests in pools of residential or commercial mortgage loans, including
mortgage loans made by savings and loan institutions, mortgage bankers,
commercial banks and others. Pools of mortgage loans are assembled as securities
for sale to investors by various governmental government-related and private
organizations. See "Mortgage Pass-Through Securities." The U.S. Government
Securities Portfolio may also invest in fixed income securities which are
secured with collateral consisting of mortgage-related securities (see
"Collateralized Mortgage Obligations"), and in other types of mortgage-related
securities.
 
Mortgage Pass-Through Securities
 
Interests in pools of mortgage-related securities differ from other forms of
fixed income securities, which normally provide for periodic payment of interest
in fixed amounts with principal payments at maturity or specified call dates.
Instead, these securities provide a monthly payment which consists of both
interest and principal payments. In effect, these payments are a "pass-through"
of the monthly payments made by the individual borrowers on their residential or
commercial mortgage loans, net of any fees paid to the issuer or guarantor of
such securities. Additional payments are caused by repayments of principal
resulting from the sale of the underlying property, refinancing or foreclosure,
net of fees or costs which may be incurred. Some mortgage-related securities
(such as securities issued by GNMA) are described as "modified pass-through."
These securities entitle the holder to receive all interest and principal
payments owed on the mortgage pool, net of certain fees, at the scheduled
payment dates regardless of whether or not the mortgagor actually makes the
payment.
 
The rate of prepayments on underlying mortgages will affect the price and
volatility of a mortgage-related security, and may have the effect of shortening
or extending the effective maturity of the security beyond what was anticipated
at the time of purchase. To the extent that unanticipated rates of prepayment on
underlying mortgages increase the effective maturity of a mortgage-related
security, the volatility of such security can be expected to increase.
 
Each of the Portfolios may invest in U.S. Government securities, which include
mortgage pass-through securities guaranteed by the U.S. Government or its
agencies or instrumentalities. The principal governmental guarantors of
mortgage-related securities are the Government National Mortgage Association
("GNMA"), the Federal National Mortgage Association ("FNMA") and the Federal
Home Loan Mortgage Corporation ("FHLMC"). GNMA is a wholly owned United States
Government corporation within the Department of Housing and Urban Development.
GNMA is authorized to guarantee, with the full faith and credit of the United
States Government, the timely payment of principal and interest on securities
issued by institutions approved by GNMA, (such as savings and loan institutions,
commercial banks and mortgage bankers) and
 
                                       12
<PAGE>   48
 
backed by pools of mortgages insured by the Federal Housing Administration (the
"FHA"), or guaranteed by the Department of Veterans Affairs (the "VA").
 
Government-related guarantors (i.e., not backed by the full faith and credit of
the United States Government) include FNMA and FHLMC. FNMA is a
government-sponsored corporation owned entirely by private stockholders. It is
subject to general regulation by the Secretary of Housing and Urban Development.
FNMA purchases conventional (i.e., not insured or guaranteed by any government
agency) residential mortgages from a list of approved seller/servicers which
include state and federally chartered savings and loan associations, mutual
savings banks, commercial banks and credit unions and mortgage bankers.
Pass-through securities issued by FNMA are guaranteed as to timely payment of
principal and interest by FNMA but are not backed by the full faith and credit
of the United States Government. FHLMC was created by Congress in 1970 for the
purpose of increasing the availability of mortgage credit for residential
housing. It is a government-sponsored corporation formerly owned by the twelve
Federal Home Loan Banks and now owned entirely by private stockholders. FHLMC
issues Participation Certificates ("PCs") which represent interests in
conventional mortgages from FHLMC's national portfolio. FHLMC guarantees the
timely payment of interest and ultimate collection of principal, but PCs are not
backed by the full faith and credit of the United States Government. Commercial
banks, savings and loan institutions, private mortgage insurance companies,
mortgage bankers and other secondary market issuers also create pass-through
pools of conventional residential mortgage loans. Such issuers may, in addition,
be the originators and/or servicers of the underlying mortgage loans as well as
the guarantors of the mortgage-related securities. Pools created by such non-
governmental issuers generally offer a higher rate of interest than government
and government-related pools because there are no direct or indirect government
or agency guarantees of payments in the former pools. However, timely payment of
interest and principal of these pools may be supported by various forms of
insurance or guarantees, including individual loan, title, pool and hazard
insurance and letters of credit. The insurance and guarantees are issued by
governmental entities, private insurers and the mortgage poolers. Such insurance
and guarantees and the creditworthiness of the issuers thereof will be
considered in determining whether a mortgage-related security meets the Trust's
investment quality standards. There can be no assurance that the private
insurers or guarantors can meet their obligations under the insurance policies
or guarantee arrangements. Although the market for such securities is becoming
increasingly liquid, securities issued by certain private organizations may not
be readily marketable. No Portfolio will purchase mortgage-related securities or
any other assets which in the Adviser's or a Sub-adviser's opinion are illiquid
if, as a result, more than 15% of the value of the Portfolio's net assets will
be illiquid (10% in the case of the Money Market Portfolio).
 
Mortgage-backed securities that are issued or guaranteed by the U.S. Government,
its agencies or instrumentalities, are not subject to the Portfolios' industry
concentration restrictions, set forth below under "Investment Restrictions," by
virtue of the exclusion from that test available to all U.S. Government
securities. In the case of privately issued mortgage-related securities, the
Portfolios take the position that mortgage-related securities do not represent
interests in any particular "industry" or group of industries. The assets
underlying such securities may be represented by a portfolio of first lien
residential mortgages (including both whole mortgage loans and mortgage
participation interests) or portfolios of mortgage pass-through securities
issued or guaranteed by GNMA, FNMA or FHLMC. Mortgage loans underlying a
mortgage-related security may in turn be insured or guaranteed by the FHA or the
Veterans' Administration. In the case of private issue mortgage-related
securities whose underlying assets are neither U.S. Government securities nor
U.S. Government-insured mortgages, to the extent that real properties securing
such assets may be located in the same geographical region, the security may be
subject to a greater risk of default than other comparable securities in the
event of adverse economic, political or business developments that may affect
such region and, ultimately, the ability of residential homeowners to make
payments of principal and interest on the underlying mortgages.
 
Collateralized Mortgage Obligations (CMOs)
 
A CMO is a hybrid between a mortgage-backed bond and a mortgage pass-through
security. Similar to a bond, interest and prepaid principal is paid, in most
cases, monthly. CMOs may be collateralized by whole
 
                                       13
<PAGE>   49
 
mortgage loans, but are more typically collateralized by portfolios of mortgage
pass-through securities guaranteed by GNMA, FHLMC, or FNMA, and their income
streams.
 
CMOs are structured in multiple classes, each bearing a different stated
maturity. Actual maturity and average life will depend upon the prepayment
experience of the collateral. CMOs provide for a modified form of call
protection through a de facto breakdown of the underlying pool of mortgages
according to how quickly the loans are repaid. Monthly payment of principal
received from the pool of underlying mortgages, including prepayments, is first
returned to investors holding the shortest maturity class. Investors holding the
longer maturity classes receive principal only after the first class has been
retired. An investor is partially guarded against a sooner than desired return
of principal because of the sequential payments.
 
As an example of a CMO transaction, a corporation ("issuer") issues multiple
series (e.g., A, B, C, Z) of CMO bonds ("Bonds"). Proceeds of the Bond offering
are used to purchase mortgages or mortgage pass-through certificates
("Collateral"). The Collateral is pledged to a third party trustee as security
for the Bonds. Principal and interest payments from the Collateral are used to
pay principal on the Bonds in the order A, B, C, Z. The Series A, B, and C Bonds
all bear current interest. Interest on the Series Z Bond is accrued and added to
principal and a like amount is paid as principal on the Series A, B, or C Bond
currently being paid off. When the Series A, B, and C Bonds are paid in full,
interest and principal on the Series Z Bond begins to be paid currently. With
some CMOs, the issuer serves as a conduit to allow loan originators (primarily
builders or savings and loan associations) to borrow against their loan
portfolios.
 
A Portfolio may also invest in, among others, parallel pay CMOs and Planned
Amortization Class CMOs ("PAC Bonds"). Parallel pay CMOs are structured to
provide payments of principal on each payment date to more than one class. These
simultaneous payments are taken into account in calculating the stated maturity
date or final distribution date, of each class, which as with other CMO
structures, must be retired by its stated maturity date or a final distribution
date, but may be retired earlier. PAC Bonds are a type of CMO tranche or series
designed to provide relatively predictable payments of principal provided that,
among other things, the actual prepayment experience on the underlying mortgage
loans falls within a predefined range. If the actual prepayment experience on
the underlying mortgage loans is at a rate faster or slower than the predefined
range, or if deviations from other assumptions occur, principal payments on the
PAC Bond may be earlier or later than predicted. The magnitude of the predefined
range varies from one PAC Bond to another, a narrower range increases the risk
that prepayments on the PAC Bond will be greater or smaller than predicted.
Because of these features, PAC Bonds generally are less subject to the risks of
prepayment than are other types of mortgage-related securities.
 
Commercial Mortgage-Backed Securities
 
Commercial mortgage-backed securities include securities that reflect an
interest in, and are secured by, mortgage loans on commercial real property.
Commercial mortgage-backed securities generally are multi-class debt or
pass-through certificates that are structured to provide protection to the
senior classes' investors against potential losses on the underlying commercial
mortgage loans. This protection generally is provided by having the holders of
subordinated classes of commercial mortgage-backed securities ("Subordinated
Securities") take the first loss if there are defaults on the underlying
mortgage loans. Other protection, which may benefit all of the classes or
particular classes, may include issuer guarantees, reserve funds, additional
Subordinated Securities, cross-collateralization and over-collateralization.
 
Subordinated Securities have no governmental guarantee and are subordinated in
some manner to the payment of principal and/or interest to the holders of more
senior commercial mortgage-backed securities arising out of the same pool of
mortgages. The holders of Subordinated Securities typically are compensated with
a higher stated yield than are the holders of more senior commercial
mortgage-backed securities. On the other hand, Subordinated Securities typically
subject the holder to greater risk than senior commercial mortgage-backed
securities and tend to be rated in a lower rating category, and frequently a
substantially lower rating category, than the senior commercial mortgage-backed
securities issued in respect of the same pool of mortgages. Subordinated
Securities generally are more sensitive to changes in prepayment and interest
rates
 
                                       14
<PAGE>   50
 
and the market for such securities may be less liquid than is the case of
traditional fixed income securities and senior commercial mortgage-backed
securities.
 
The market for commercial mortgage-backed securities developed more recently and
in terms of total outstanding principal amount of issues is relatively small
compared to the market for residential single-family mortgage-backed securities.
In addition, commercial lending generally is viewed as exposing the lender to a
greater risk of loss than one- to four-family residential lending. Commercial
lending, for example, typically involves larger loans to single borrowers or
groups of related borrowers than residential one- to four-family mortgage loans.
In addition, the repayment of loans secured by income producing properties
typically is dependent upon the successful operation of the related real estate
project and the cash flow it generates. Consequently, adverse changes in
economic conditions and circumstances are more likely to have an adverse impact
on commercial mortgage-backed securities secured by loans on commercial
properties than on those secured by loans on residential properties.
 
Other Mortgage-Related Securities
 
Other mortgage-related securities include securities other than those described
above that directly or indirectly represent a participation in, or are secured
by and payable from, mortgage loans on real property, including mortgage dollar
rolls, CMO residuals or stripped mortgage-backed securities ("SMBS"). Other
mortgage-related securities may be equity or fixed income securities issued by
agencies or instrumentalities of the U.S. Government or by private originators
of, or investors in, mortgage loans, including savings and loan associations,
homebuilders, mortgage banks, commercial banks, investment banks, partnerships,
trusts and special purpose entities of the foregoing.
 
CMO Residuals
 
CMO residuals are mortgage securities issued by agencies or instrumentalities of
the U.S. Government or by private originators of, or investors in, mortgage
loans, including savings and loan associations, homebuilders, mortgage banks,
commercial banks, investment banks and special purpose entities of the
foregoing.
 
The cash flow generated by the mortgage assets underlying a series of CMOs is
applied first to make required payments of principal and interest on the CMOs
and second to pay the related administrative expenses of the issuer. The
residual in a CMO structure generally represents the interest in any excess cash
flow remaining after making the foregoing payments. Each payment of such excess
cash flow to a holder of the related CMO residual represents income and/or a
return of capital. The amount of residual cash flow resulting from a CMO will
depend on, among other things, the characteristics of the mortgage assets, the
coupon rate of each class of CMO, prevailing interest rates, the amount of
administrative expenses and the prepayment experience on the mortgage assets. In
particular, the yield to maturity on CMO residuals is extremely sensitive to
prepayments on the related underlying mortgage assets, in the same manner as an
interest-only ("IO") class of stripped mortgage-backed securities. See "Stripped
Mortgage-Backed Securities." In addition, if a series of a CMO includes a class
that bears interest at an adjustable rate, the yield to maturity on the related
CMO residual will also be extremely sensitive to changes in the level of the
index upon which interest rate adjustments are based. As described below with
respect to stripped mortgage-backed securities, in certain circumstances a
Portfolio may fail to recoup fully its initial investment in a CMO residual.
 
CMO residuals are generally purchased and sold by institutional investors
through several investment banking firms acting as brokers or dealers. The CMO
residual market has only very recently developed and CMO residuals currently may
not have the liquidity of other more established securities trading in other
markets. Transactions in CMO residuals are generally completed only after
careful review of the characteristics of the securities in question. In
addition, CMO residuals may, or pursuant to an exemption therefrom, may not have
been registered under the 1933 Act. CMO residuals, whether or not registered
under the 1933 Act, may be subject to certain restrictions on transferability,
and may be deemed "illiquid" and subject to a Portfolio's limitations on
investment in illiquid securities.
 
                                       15
<PAGE>   51
 
Stripped Mortgage-Backed Securities ("SMBS")
 
SMBS are derivative multi-class mortgage securities. SMBS may be issued by
agencies or instrumentalities of the U.S. Government, or by private originators
of, or investors in, mortgage loans, including savings and loan associations,
mortgage banks, commercial banks, investment banks and special purpose entities
of the foregoing.
 
SMBS are usually structured with two classes that receive different proportions
of the interest and principal distributions on a pool of mortgage assets. A
common type of SMBS will have one class receiving some of the interest and most
of the principal from the mortgage assets, while the other class will receive
most of the interest and the remainder of the principal. In the most extreme
case, one class will receive all of the interest (the interest-only or "IO"
class), while the other class will receive all of the principal (the
principal-only or "PO" class). The yield to maturity on an IO class is extremely
sensitive to the rate of principal payments (including prepayments) on the
related underlying mortgage assets, and a rapid rate of principal payments may
have a material adverse effect on a Portfolio's yield to maturity from these
securities. If the underlying mortgage assets experience greater than
anticipated prepayments of principal, a Portfolio may fail to recoup some or all
of its initial investment in these securities even if the security is in one of
the highest rating categories.
 
Although SMBS are purchased and sold by institutional investors through several
investment banking firms acting as brokers or dealers, these securities were
only recently developed. As a result, established trading markets have not yet
developed and, accordingly, these securities may be deemed "illiquid" and
subject to a Portfolio's limitations on investment in illiquid securities.
 
OPTIONS AND FINANCIAL FUTURES CONTRACTS
 
Each Portfolio, other than the Money Market Portfolio, may write covered call
and put options on securities and securities indices. A call option is a
contract that gives to the holder the right to buy a specified amount of the
underlying security or currency at a fixed or determinable price (called the
exercise or "strike" price) upon exercise of the option. A put option is a
contract that gives the holder the right to sell a specified amount of the
underlying security or currency at a fixed or determinable price upon exercise
of the option.
 
To "cover" a call option written, a Portfolio may, for example, identify and
have available for sale the specific portfolio security, group of securities, or
foreign currency to which the option relates. To cover a put option written, a
Portfolio may, for example, establish a segregated asset account with its
custodian containing cash or liquid assets that, when added to amounts deposited
with its broker or futures commission merchant ("FCM") as margin, equals the
market value of the instruments underlying the put option written.
 
Each Portfolio, other than the Money Market Portfolio, also may write options on
securities and securities indices. If a Portfolio writes an option which expires
unexercised or is closed out by the Portfolio at a profit, it will retain the
premium received for the option, which will increase its gross income. If the
price of the underlying security or currency moves adversely to the Portfolio's
position, the option may be exercised and the Portfolio, as the writer of the
option, will be required to sell or purchase the underlying security or currency
at a disadvantageous price, which may only be partially offset by the amount of
premium received.
 
Options on stock indices are similar to options on stock, except that all
settlements are made in cash rather than by delivery of stock, and gains or
losses depend on price movements in the stock market generally (or in a
particular industry or segment of the market represented by the index) rather
than price movements of individual stocks. When a Portfolio writes an option on
a securities index, and the underlying index moves adversely to the Portfolio's
position, the option may be exercised. Upon such exercise, the Portfolio, as the
writer of the option, will be required to pay in cash an amount equal to the
difference between the exercise settlement value of the underlying index and the
exercise price of the option, multiplied by a specified index "multiplier."
 
Call or put options on a stock index may be written at an exercise or "strike"
price which is either below or above the current value of the index. If the
exercise price at the time of writing the option is below the current value of
the index for a call option or above the current value of the index for a put
option the option is
                                       16
<PAGE>   52
 
considered to be "in the money." In such a case, the Portfolio will cover such
options written by segregating with its custodian or pledging to its commodity
broker as collateral cash, U.S. Government or other high-grade, short-term debt
obligations equal in value to the amount by which the option written is in the
money, times the multiplier, times the number of contracts.
 
Examples of stock and fixed income indices for options include the S&P 500
Index, Value Line Index, National OTC Index, Major Market Index, Computer
Technology Index, Oil Index, NYSE Options Index, Technology Index, Gold/Silver
Index, Institutional Index, NYSE Beta Index, Lehman Government Corporate Bond
Index, Lehman Treasury Bond Index, Canadian Market Portfolio Index (Montreal
Stock Exchange), Financial Tower Stock Exchange 100 (London Stock Exchange) and
Toronto Stock Exchange Composite 300 (Toronto Stock Exchange). The Portfolios
may also use options on such other indices as may now or in the future be
available.
 
Each Portfolio, other than the Money Market Portfolio, may also purchase put or
call options on securities and securities indices in order to (i) hedge against
anticipated changes in interest rates or stock prices that may adversely affect
the prices of securities that the Portfolio intends to purchase at a later date,
(ii) hedge its investments against an anticipated decline in value, or (iii)
attempt to reduce the risk of missing a market or industry segment advance.
These Portfolios also may purchase put options on foreign currencies that
correlate with the Portfolio's portfolio securities in order to minimize or
hedge against anticipated declines in the exchange rate of the currencies in
which the Portfolio's securities are denominated and may purchase call options
on foreign currencies that correlate with its portfolio securities to take
advantage of anticipated increases in exchange rates. In the event that the
anticipated changes in interest rates, stock prices, or exchange rates occur,
the Portfolio may be able to offset the resulting adverse effect on the
Portfolio, in whole or in part, through the options purchased.
 
The premium paid for a put or call option plus any transaction costs will reduce
the benefit if any, realized by the Portfolio upon exercise or liquidation of
the option, and, unless the price of the underlying security, securities index,
or currency changes sufficiently, the option may expire without value to the
Portfolio. To close option positions purchased by the Portfolios, the Portfolios
may sell put or call options identical to options previously purchased, which
could result in a net gain or loss depending on whether the amount received on
the sale is more or less than the premium and other transaction costs paid on
the put or call option purchased.
 
Options used by the Portfolios may be traded on the national securities
exchanges or in the over-the-counter market. Each Portfolio, other than the
Money Market Portfolio, may use over-the-counter options. Options traded in the
over-the-counter market may not be as actively traded as those on an exchange.
Accordingly, it may be more difficult to value such options. In addition, it may
be more difficult to enter into closing transactions with respect to options
traded over-the-counter. In this regard, the Portfolios may enter into contracts
with the primary dealers with whom they write over-the-counter options. The
contracts will provide that each Portfolio has the absolute right to repurchase
an option it writes at any time at a repurchase price which represents the fair
market value of such option, as determined in good faith through negotiations
between the parties, but which in no event will exceed a price determined
pursuant to a formula contained in the contract. Although the specific details
of the formula may vary between contracts with different primary dealers, the
formula will generally be based on a multiple of the premium received by each
Portfolio for writing the option, plus the amount, if any, of the option's
intrinsic value (i.e., the amount the option is "in-the-money"). The formula
will also include a factor to account for the difference between the price of
the security and the strike price of the option if the option is written
"out-of-the-money." Although the specific details of the formula may vary with
different primary dealers, each contract will provide a formula to determine the
maximum price at which each Portfolio can repurchase the option at any time. The
Portfolios have established standards of creditworthiness for these primary
dealers.
 
Writing Covered Call and Put Options and Purchasing Call and Put Options
 
Each Portfolio, other than the Money Market Portfolio, may write exchange-traded
covered call and put options on or relating to specific securities in order to
earn additional income or, in the case of a call written, to
 
                                       17
<PAGE>   53
 
minimize or hedge against anticipated declines in the value of the Portfolio's
securities. To "cover" an option means, for example, to identify and make
available for sale the specific portfolio security or foreign currency to which
the option relates. Through the writing of a covered call option a Portfolio
receives premium income but obligates itself to sell to the purchaser of such an
option the particular security or foreign currency underlying the option at a
specified price at any time prior to the expiration of the option period,
regardless of the market value of the security or the exchange rate for the
foreign currency during this period. Through the writing of a covered put option
a Portfolio receives premium income but obligates itself to purchase a
particular security or foreign currency underlying the option at a specified
price at any time prior to the expiration of the option period, regardless of
market value or exchange rate during the option period.
 
Each Portfolio, other than the Money Market Portfolio, in accordance with their
investment objective (s) and investment programs, may also write exchange-traded
covered call and put options on indices and may purchase call and put options on
indices that correlate with the Portfolio's portfolio securities. These
Portfolios may engage in such transactions for the same purposes as they may
engage in such transactions with respect to individual portfolio securities or
foreign currencies, that is, to generate additional income or as a hedging
technique to minimize anticipated declines in the value of the Portfolio's
portfolio securities or the exchange rate of the securities in which the
Portfolio invested. In economic effect, a stock index call or put option is
similar to an option on a particular security, except that the value of the
option depends on the weighted value of the group of securities comprising the
index, rather than a particular security, and settlements are made in cash
rather than by delivery of a particular security.
 
Each Portfolio, other than the Money Market Portfolio, may also purchase
exchange-traded call and put options with respect to securities and indices that
correlate with that Portfolio's particular portfolio securities.
 
A Portfolio may purchase put options for defensive purposes in order to protect
against an anticipated decline in the value of its portfolio securities or
currencies. As the holder of a put option with respect to individual securities
or currencies, the Portfolio has the right to sell the securities or currencies
underlying the options and to receive a cash payment at the exercise price at
any time during the option period. As the holder of a put option on an index, a
Portfolio has the right to receive, upon exercise of the option, a cash payment
equal to a multiple of any excess of the strike price specified by the option
over the value of the index.
 
A Portfolio may purchase call options on individual securities, currencies or
stock indices in order to take advantage of anticipated increases in the price
of those securities or currencies by purchasing the right to acquire the
securities or currencies underlying the option or, with respect to options on
indices, to receive income equal to the value of such index over the strike
price. As the holder of a call option with respect to individual securities or
currencies, a Portfolio obtains the right to purchase the underlying securities
or currencies at the exercise price at any time during the option period. As the
holder of a call option on a stock index, a Portfolio obtains the right to
receive, upon exercise of the option, a cash payment equal to the multiple of
any excess of the value of the index on the exercise date over the strike price
specified in the option.
 
Over-the-counter options are not traded on an exchange and may not be as
actively traded as listed securities, making the valuation of these securities
more difficult. In addition, an unlisted option entails a risk not found in
connection with listed options -- that the party on the other side of the option
transaction will default. This may make it impossible to close out an unlisted
option position in some cases, and profits may be lost thereby. Such
over-the-counter options, unless otherwise indicated, will be considered
illiquid securities. The Portfolios will engage in such transactions only with
firms of sufficient credit to minimize these risks. In instances in which a
Portfolio has entered into agreements with primary dealers with respect to the
over-the-counter options it has written, and such agreements would enable the
Portfolio to have an absolute right to repurchase, at a pre-established formula
price, the over-the-counter options written by it, the Portfolio will treat as
illiquid only the amount equal to the formula price described above less the
amount by which the option is "in-the-money."
 
Although these investment practices will be used to generate additional income
and to attempt to reduce the effect of any adverse price movement in the
securities or currencies subject to the option, they do involve certain risks
that are different in some respects from investment risks associated with
similar Portfolios which
                                       18
<PAGE>   54
 
do not engage in such activities. These risks include the following: writing
covered call options -- the inability to effect closing transactions at
favorable prices and the inability to participate in the appreciation of the
underlying securities or currencies above the exercise price; writing covered
put options -- the inability to effect closing transactions at favorable prices
and the obligation to purchase the specified securities or currencies or to make
a cash settlement on the stock index at prices which may not reflect current
market values or exchange rates; and purchasing put and call options -- possible
loss of the entire premium paid. In addition, the effectiveness of hedging
through the purchase or sale (writing) of stock index options will depend upon
the extent to which price movements in the portion of a Portfolio's portfolio
being hedged correlate with price movements in the selected stock index. Perfect
correlation may not be possible because the securities held or to be acquired by
a Portfolio may not exactly match the composition of the stock index on which
options are purchased or written. If the forecasts of the Adviser or the
Sub-advisers regarding movements in securities prices, currencies or interest
rates are incorrect, a Portfolio's investment results may have been better
without the hedge.
 
Financial Futures Contracts
 
Each Portfolio, other than the Money Market Portfolio, in accordance with its
investment objective(s), investment program, policies, and restrictions may
purchase and sell exchange-traded financial futures contracts as a hedge to
protect against anticipated changes in prevailing interest rates, overall stock
prices or currency rates, or to efficiently and in a less costly manner
implement either increases or decreases in exposure to the equity or bond
markets. The Portfolios may also write covered call options and purchase put and
call options on financial futures contracts for the same purposes or to earn
additional income and write covered put options on stock index futures
contracts. The International Equity Portfolio may utilize currency futures
contracts and both listed and unlisted financial futures contracts and options
thereon.
 
Financial futures contracts consist of interest rate futures contracts, stock
index futures contracts, and currency futures contracts. An interest rate
futures contract is a contract to buy or sell specified debt securities at a
future time for a fixed price. A stock index futures contract is similar in
economic effect, except that rather than being based on specific securities, it
is based on a specified index of stocks and not the stocks themselves. A
currency futures contract is a contract to buy or sell a specific foreign
currency at a future time for a fixed price.
 
An interest rate futures contract binds the seller to deliver to the purchaser
on a specified future date a specified quantity of one of several listed
financial instruments, against payment of a settlement price specified in the
contract. A public market currently exists for futures contracts covering a
number of indices as well as financial instruments and foreign currencies,
including: U.S. Treasury bonds; U.S. Treasury notes; GNMA Certificates;
three-month U.S. Treasury bills; 90-day commercial paper; bank certificates of
deposit; Eurodollar certificates of deposit; the Australian dollar; the Canadian
dollar; the British pound; the German mark; the Japanese yen; the French franc;
the Swiss franc; the Mexican peso; and certain multinational currencies, such as
the European Currency Unit ("ECU"). It is expected that other futures contracts
will be developed and traded in the future.
 
Stock index futures contracts bind purchaser and seller to deliver, at a future
date specified in the contract, a cash amount equal to a multiple of the
difference between the value of a specified stock index on that date and the
settlement price specified by the contract. That is, the seller of the futures
contract must pay and the purchaser would receive a multiple of any excess of
the value of the index over the settlement price, and conversely, the purchaser
must pay and the seller would receive a multiple of any excess of the settlement
price over the value of the index. Stock index futures contracts are currently
traded with respect to the S&P 100 Index and other market indices such as the
S&P 500 Index, the S&P MidCap 400, the Nikkei 225, the New York Stock Exchange
Composite Index, the Value Line Stock Index, and the Major Market Index. It is
expected that financial instruments related to broad-based indices, in addition
to those for which futures contracts are currently traded, will in the future be
the subject of publicly-traded futures contracts, and the Portfolios may use any
of these, which are appropriate, in its hedging strategies.
 
                                       19
<PAGE>   55
 
A financial futures contract is an agreement to buy or sell a security (or
deliver a final cash settlement price, in the case of a contract relating to an
index or otherwise not calling for physical delivery of a specified security)
for a set price in the future. Exchange-traded futures contracts are designated
by boards of trade which have been designated "contracts markets" by the
Commodity Futures Trading Commission ("CFTC").
 
Positions taken in the futures markets are not normally held until delivery or
cash settlement is required, but instead are liquidated through offsetting
transactions which may result in a gain or a loss. While futures positions taken
by a Portfolio will usually be liquidated in this manner, the Portfolio may
instead make or take delivery of underlying securities whenever it appears
economically advantageous to the Portfolio to do so. A clearing organization
associated with the relevant exchange assumes responsibility for closing out
transactions and guarantees that, as between the clearing members of an
exchange, the sale and purchase obligations will be performed with regard to all
positions that remain open at the termination of the contract.
 
Unlisted financial futures contracts, which may be purchased or sold by each
Portfolio, other than the Money Market Portfolio, are not traded on an exchange
and, generally, are not as actively traded as listed futures contracts or listed
securities. Such financial futures contracts generally do not have the following
elements: standardized contract terms, margin requirements relating to price
movements, clearing organizations that guarantee counter-party performance, open
and competitive trading in centralized markets, and public price dissemination.
These elements in listed instruments serve to facilitate their trading and
accurate valuation. As a result the accurate valuation of unlisted financial
futures contracts may be difficult. In addition, it may be difficult or even
impossible, in some cases, to close out an unlisted financial futures contract,
which may, in turn, result in significant losses to the Portfolio. Such unlisted
financial futures contracts will be considered by the Portfolio to be illiquid
securities and together with other illiquid securities will be subject to each
Portfolio's limitations on investments in illiquid securities. In making such
determination, the value of unlisted financial futures contracts will be based
upon the "face amount" of such contracts.
 
When financial futures contracts are entered into by a Portfolio, either as the
purchaser or the seller of such contracts, the Portfolio is required to deposit
with the Custodian in a segregated account in the name of the FCM an initial
margin of cash or U.S. Treasury bills equaling as much as 5% to 10% or more of
the contract settlement price. The nature of initial margin requirements in
futures transactions differs from traditional margin payments made in securities
transactions in that initial margins for financial futures contracts do not
involve the borrowing of funds by the customer to finance the transaction.
Instead, a customer's initial margin on a financial futures contract represents
a good faith deposit securing the customer's contractual obligations under the
financial futures contract. The initial margin deposit is returned, assuming
these obligations have been met, when the financial futures contract is
terminated. In addition, subsequent payments to and from the FCM, called
"variation margin," are made on a daily basis as the price of the underlying
security, stock index, or currency fluctuates, reflecting the change in value in
the long (purchase) or short (sale) positions in the financial futures contract,
a process known as "marking to market."
 
Each Portfolio, other than the Money Market Portfolio, may hold financial
futures contracts in accordance with its investment policies.
 
Financial futures contracts generally are not entered into to acquire the
underlying asset and generally are not held to term. Prior to the contract
settlement date, the Portfolios will normally close all futures positions by
entering into an offsetting transaction which operates to cancel the position
held, and which usually results in a profit or loss.
 
Options on Financial Futures Contracts
 
Each Portfolio, other than the Money Market Portfolio, may also purchase call
and put options on financial futures contracts and write call and put options on
financial futures contracts of the type which the particular Portfolio is
authorized to enter into. Options on financial futures contracts used by the
Portfolios are traded on exchanges that are licensed and regulated by the CFTC.
A call option on a financial futures contract gives the purchaser the right in
return for the premium paid, to purchase a financial futures contract (assume a
"long" position) at a specified exercise price at any time before the option
expires. A put option gives the purchaser
 
                                       20
<PAGE>   56
 
the right, in return for the premium paid, to sell a financial futures contract
(assume a "short" position), for a specified exercise price, at any time before
the option expires.
 
Unlike entering into financial futures contracts, purchasing options on
financial futures contracts allows a Portfolio to decline to exercise the
option, thereby avoiding any loss beyond foregoing the purchase price (or
"premium") paid for the options. Therefore, the purchase of options on financial
futures contracts may be a preferable hedging strategy when a Portfolio desires
maximum flexibility. Whether, in order to achieve a particular objective, a
Portfolio enters into a financial futures contract, on the one hand, or an
option contract, on the other, will depend on all the circumstances, including
the relative costs, liquidity, availability and capital requirements of such
financial futures and options contracts. Also, the Portfolios will consider the
relative risks involved, which may be quite different. These factors, among
others, will be considered in light of market conditions and the particular
objective to be achieved.
 
Certain Additional Risks of Options and Financial Futures Contracts
 
The use of options and financial futures contracts may entail the following
risks. First, although such instruments when used by the Portfolios are intended
to correlate with the Portfolios' portfolio securities or currencies, in many
cases the options or financial futures contracts used may be based on
securities, currencies, or stock indices the components of which are not
identical to the portfolio securities owned or intended to be acquired by the
Portfolios. Second, due to supply and demand imbalances and other market
factors, the price movements of financial futures contracts, options thereon,
currency options, and stock index options may not necessarily correspond exactly
to the price movements of the securities, currencies, or stock indices on which
such instruments are based. Accordingly, there is a risk that a Portfolio's
transactions in those instruments will not in fact offset the impact on the
Portfolio of adverse market developments in the manner or to the extent
contemplated or that such transactions will result in losses to the Portfolio
which are not offset by gains with respect to corresponding portfolio securities
owned or to be purchased by that Portfolio.
 
To some extent, these risks can be minimized by careful management of hedging
activities. For example, where price movements in a financial futures or option
contract are expected to be less volatile than price movements in the related
portfolio securities owned or intended to be acquired by a Portfolio, it may, in
order to compensate for this difference, use an amount of financial futures or
option contracts which is greater than the amount of such portfolio securities.
Similarly, where the price movement of a financial futures or option contract is
anticipated to be more volatile, a Portfolio may use an amount of such contracts
which is smaller than the amount of portfolio securities to which such contracts
relate.
 
The risk that the hedging technique used will not actually or entirely offset an
adverse change in a Portfolio's portfolio securities is particularly relevant to
financial futures contracts and options written on stock indices and currencies.
A Portfolio, in entering into a futures purchase contract, potentially could
lose any or all of the contract's settlement price. In entering into a futures
sale contract, a Portfolio could potentially lose a sum equal to the excess of
the contract's value (marked to market daily) over the contract's settlement
price. In writing options on indices or currencies a Portfolio could potentially
lose a sum equal to the excess of the value of the index or currency (marked to
market daily) over the exercise price. In addition, because financial futures
contracts require delivery at a future date of either a specified security or
currency, or an amount of cash equal to a multiple of the difference between the
value of a specified stock index on that date and the settlement price, an
algebraic relationship exists between any price movement in the underlying
security or currency or index and the potential cost of settlement to a
Portfolio. A small increase or decrease in the value of the underlying security
or currency or stock index can, therefore, result in a much greater increase or
decrease in the cost to the Portfolio.
 
Index call options written also pose another risk as hedging tools. Because
exercises of index options are settled in cash, there is an inherent timing risk
that the value of a Portfolio's portfolio securities "covering" a stock index
call option written by it may decline during the time between exercise of the
option by the option holder and notice to the Portfolio of such exercise
(usually one day or more) thereby requiring the Portfolio to
 
                                       21
<PAGE>   57
 
use additional assets to settle the transaction. This risk is not present in the
case of covered call options on individual securities, which are settled by
delivery of the actual securities.
 
There are also special risks in using currency options including the following:
(i) settlement of such options must occur in the country issuing the currency in
conformity with foreign regulations for such delivery, including the possible
imposition of additional costs and taxes, (ii) no systematic reporting of "last
sale" information for foreign currencies, and (iii) the need to use "odd lot"
transactions for underlying currencies at prices less favorable than those for
"round lot" transactions.
 
Although the Portfolios intend to establish positions in these instruments only
when there appears to be an active market, there is no assurance that a liquid
market for such instruments will exist when a Portfolio seeks to "close out"
(i.e. terminate) a particular financial futures contract or option position.
This is particularly relevant for over-the-counter options and financial futures
contracts, as previously noted. Trading in such instruments could be
interrupted, for example, because of a lack of either buyers or sellers. In
addition, the futures and options exchanges may suspend trading after the price
of such instruments has risen or fallen more than the maximum amount specified
by the exchange. Exercise of options could also be restricted or delayed because
of regulatory restrictions or other factors. A Portfolio may be able, by
adjusting investment strategy in the cash or other contract markets, to offset
to some extent any adverse effects of being unable to liquidate a hedge
position. Nevertheless, in some cases, a Portfolio may experience losses as a
result of such inability. Therefore it may have to liquidate other more
advantageous investments to meet its cash needs.
 
   
In addition, FCMs or brokers in certain circumstances will have access to a
Portfolio's assets posted as margin in connection with these transactions as
permitted under the 1940 Act. See "Custodian" in this SAI. The Portfolios will
use only FCMs or brokers in whose reliability and financial soundness they have
full confidence and have adopted certain other procedures and limitations to
reduce the risk of loss with respect to any assets which brokers hold or to
which they may have access. Nevertheless, in the event of a brokers insolvency
or bankruptcy, it is possible that a Portfolio could experience a delay or incur
costs in recovering such assets or might recover less than the full amount due.
Also the value of such assets could decline by the time a Portfolio could effect
such recovery.
    
 
The success of a Portfolio in using hedging techniques depends, among other
things, on the Adviser's or a Sub-adviser's ability to predict the direction and
volatility of price movements in both the futures and options markets as well as
the securities markets and on the Adviser's or the Sub-adviser's ability to
select the proper type, time, and duration of hedges. There can be no assurance
that these techniques will produce their intended results. In any event, the
Sub-adviser will use financial futures contracts, options thereon, currency
options and stock index options only when it believes the overall effect is to
reduce, rather than increase, the risks to which a Portfolio is exposed. Hedging
transactions also, of course, may be more, rather than less, favorable to a
Portfolio than originally anticipated.
 
Limitations
 
No Portfolio will enter into any financial futures contract or purchase any
option thereon if, immediately thereafter, the total amount of its assets
required to be on deposit as initial margin to secure its obligations under
financial futures contracts, plus the amount of premiums paid by it for
outstanding options to purchase futures contracts, exceeds 5% of the market
value of its total assets; provided however, that in the case of an option that
is in-the-money at the time of purchase, the in-the-money amount may be excluded
in calculating the 5% limitation.
 
In addition, each Portfolio has an operating policy which provides that it will
not enter into financial futures contracts or write put or call options with
respect to financial futures contracts unless such transactions are either
"covered" or subject to segregation requirements considered appropriate by the
SEC staff. Further, each Portfolio has an operating policy which provides that
it will not enter into custodial arrangements with respect to initial or
variation margin deposits or marked-to-market amounts unless the custody of such
initial and variation margin deposits and marked-to-marked amounts are in
compliance with current SEC staff interpretive positions or no-action letters or
rules adopted by the SEC.
 
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<PAGE>   58
 
REAL ESTATE SECURITIES AND REAL ESTATE INVESTMENT TRUSTS ("REITS")
 
Each Portfolio, other than the Money Market Portfolio and the U.S. Government
Securities Portfolio, may invest in real estate securities and REITs. Real
estate securities are equity securities consisting of (i) common stocks, (ii)
rights or warrants to purchase common stocks, (iii) securities convertible into
common stocks and (iv) preferred stocks issued by real estate companies. A real
estate company is one that derives at least 50% of its revenues from the
ownership, construction, financing, management or sale of commercial,
industrial, or residential real estate or that has at least 50% of its assets
invested in real estate.
 
REITs are pooled investment vehicles which invest primarily in income producing
real estate or real estate related loans or interest. REITs are generally
classified as equity REITs, mortgage REITs or a combination of equity and
mortgage REITs. Equity REITs invest the majority of their assets directly in
real property and derive income primarily from the collection of rents. Equity
REITs can also realize capital gains by selling properties that have appreciated
in value. Mortgage REITs invest the majority of their assets in real estate
mortgages and derive income from the collection of interest payments. Like
regulated investment companies such as the Portfolios, REITs are not taxed on
income distributed to shareholders provided they comply with certain
requirements under the Code. A Portfolio will indirectly bear its proportionate
share of any expenses paid by REITs in which it invests in addition to the
expenses paid by a Portfolio.
 
Investing in REITs involves certain unique risks. Equity REITs may be affected
by changes in the value of the underlying property owned by such REITs, while
mortgage REITs may be affected by the quality of any credit extended. REITs are
dependent upon management skills, are not diversified (except to the extent the
Code requires), and are subject to the risks of financing projects. REITs are
subject to heavy cash flow dependency, default by borrowers, self-liquidation,
and the possibilities of failing to qualify for the exemption from tax for
distributed income under the Code and failing to maintain their exemptions from
the 1940 Act. REITs (especially mortgage REITs) are also subject to interest
rate risks.
 
REPURCHASE AGREEMENTS
 
Each Portfolio may hold commercial paper, certificates of deposits, and
government obligations (including government guaranteed obligations), subject to
repurchase agreements with certain well established domestic banks and certain
broker-dealers, including primary government securities dealers, approved as
creditworthy by the Trustees. The underlying securities must be obligations of
the U.S. Government or its agencies or instrumentalities or other high quality,
short-term debt obligations. Repurchase agreements are generally for short
periods, often less than a week. Repurchase agreements typically obligate a
seller, at the time it sells securities to a Portfolio, to repurchase the
securities at a specific future time and price. The price for which the
Portfolio resells the securities is calculated to exceed the price the Portfolio
initially paid for the same securities, thereby determining the yield during the
Portfolio's holding period. This result is a fixed market rate of interest,
agreed upon by that Portfolio and the seller, which is accrued as ordinary
income. Most repurchase agreements mature within seven days although some may
have a longer duration. The underlying securities constitute collateral for
these repurchase agreements, which are considered loans under the 1940 Act.
 
The Portfolios do not intend to sell the underlying securities subject to a
repurchase agreement (except to the seller upon maturity of the agreement).
During the term of the repurchase agreement, the Portfolios (i) retain the
securities subject to the repurchase agreement as collateral securing the
sellers obligation to repurchase the securities, (ii) monitor on a daily basis
the market value of the securities subject to the repurchase agreement, and
(iii) require the seller to deposit with the Trust's Custodian collateral equal
to any amount by which the market value of the securities subject to the
repurchase agreement falls below the resale amount provided under the repurchase
agreement. In the event that a seller defaults on its obligation to repurchase
the securities, a Portfolio must hold the securities until they mature or may
sell them on the open market, either of which may result in a loss to the
Portfolio if, and to the extent that, the values of the securities decline.
Additionally, a Portfolio may incur disposition expenses when selling the
securities. Bankruptcy proceedings by the seller may also limit or delay
realization and liquidation of the collateral by a Portfolio and may result in a
loss to that Portfolio. The Trustees of the Trust will evaluate the
creditworthiness of all banks and broker-dealers with which the Trust proposes
to enter into repurchase agreements. A Portfolio will not invest in
 
                                       23
<PAGE>   59
 
repurchase agreements that do not mature within seven days if any such
investment, together with any illiquid assets held by the Portfolio, exceeds 15%
of the value of that Portfolio's total assets (10% in the case of the Money
Market Portfolio).
 
TEMPORARY DEFENSIVE POSITION
 
Under normal market conditions, none of the Portfolios, other than the Money
Market Portfolio, intends to have a substantial portion of its assets invested
in cash, money market instruments or U.S. Government securities, though the U.S.
Government Securities Portfolio will have a substantial portion of its assets
invested in U.S. Government securities. However, when the Adviser or a
Sub-adviser determines that adverse market conditions exist, each Portfolio may
adopt a temporary defensive posture and invest entirely in cash, money market
instruments, including domestic bank obligations, repurchase agreements and U.S.
Government securities. When a Portfolio is invested in this manner, it may not
be able to achieve its investment objective.
 
VARIABLE OR FLOATING RATE SECURITIES
 
The Money Market Portfolio, U.S. Government Securities Portfolio and the Growth
Equity Portfolio may invest in adjustable rate securities. Adjustable rate
securities (i.e., variable rate and floating rate instruments) are securities
that have interest rates that are adjusted periodically, according to a set
formula. The maturity of some adjustable rate securities may be shortened under
certain special conditions described more fully below.
 
Variable rate instruments are obligations (usually certificates of deposit) that
provide for the adjustment of their interest rates on predetermined dates or
whenever a specific interest rate changes. A variable rate instrument whose
principal amount is scheduled to be paid in 13 months or less is considered to
have a maturity equal to the period remaining until the next readjustment of the
interest rate. Many variable rate instruments are subject to demand features
which entitle the purchaser to resell such securities to the issuer or another
designated party, either (1) at any time upon notice of usually 30 days or less,
or (2) at specified intervals, not exceeding 13 months, and upon 30 days notice.
A variable rate instrument subject to a demand feature is considered to have a
maturity equal to the longer of the period remaining until the next readjustment
of the interest rate or the period remaining until the principal amount can be
recovered through demand.
 
Floating rate instruments (generally corporate notes, bank notes, or Eurodollar
certificates of deposit) have interest rate reset provisions similar to those
for variable rate instruments and may be subject to demand features like those
for variable rate instruments. The maturity of a floating rate instrument is
considered to be the period remaining until the principal amount can be
recovered through demand.
 
The Money Market Portfolio, the Growth Equity Portfolio and the Growth and
Income Portfolio may invest in inverse floaters, which are derivative fixed
income or municipal securities. Inverse floaters may be issued by agencies or
instrumentalities of the U.S. government or by private issuers including savings
and loan associations, mortgage banks, commercial banks, investment banks and
special purpose subsidiaries of the foregoing. Inverse floaters generally have
greater volatility than other types of mortgage securities in which a Portfolio
may invest. Although inverse floaters are purchased and sold by institutional
investors through several investment banking firms acting as brokers or dealers,
the market for such securities has not yet been fully developed. Accordingly,
inverse floaters are generally illiquid.
 
Inverse floaters are structured as a class of security that receives
distributions on a pool of mortgage assets and whose yields move in the opposite
direction of short-term interest rates and at an accelerated rate. Such
securities have the effect of providing a degree of investment leverage since
they will generally increase or decrease in value in response to changes in
market interest rates at a rate which is a multiple (typically two) of the rate
at which fixed-rate long-term debt obligations increase or decrease in response
to such changes. As a result, the market values of such securities will
generally be more volatile than the market value of fixed-rate securities.
 
Variable-rate demand notes include master demand notes which are obligations
that permit a Portfolio to invest fluctuating amounts, which may change daily
without penalty, pursuant to direct arrangements between
 
                                       24
<PAGE>   60
 
the Portfolio as lender and the borrower. The interest rates on these notes
fluctuate from time to time. The issuer of such obligations normally has a
corresponding right, after a given period, to prepay, in its discretion, the
outstanding principal amount of the obligations plus accrued interest upon a
specified number of days' notice to the holders of such obligations. The
interest rate on a floating-rate demand obligation is based on a known lending
rate, such as a bank's prime rate, and is adjusted automatically each time such
rate is adjusted. The interest rate on a variable-rate demand obligation is
adjusted automatically at specified intervals. Frequently, such obligations are
secured by letters of credit or other credit support arrangements provided by
banks. Because these obligations are direct lending arrangements between the
lender and borrower, it is not contemplated that such instruments will generally
be traded, and there generally is not an established secondary market for these
obligations, although they are redeemable at face value. Accordingly, where
these obligations are not secured by letters of credit or other credit support
arrangements, the Portfolio's right to redeem is dependent on the ability of the
borrower to pay principal and interest on demand. Such obligations frequently
are not rated by credit rating agencies. If not so rated, a Portfolio may invest
in them only if the Portfolio's Sub-adviser determines that, at the time of
investment, the obligations are of comparable quality to the other obligations
in which the Portfolio may invest. The Sub-adviser, on behalf of a Portfolio,
will consider on an ongoing basis the creditworthiness of the issuers of the
floating- and variable-rate demand obligations in the Portfolio's portfolio.
 
WARRANTS
 
The Emerging Growth Portfolio, the International Equity Portfolio, the Growth
and Income Portfolio and the EliteValue Portfolio may invest in or acquire
warrants. Warrants are instruments which entitle the holder to buy underlying
equity or fixed income securities at a specific price for a specific period of
time. A warrant tends to be more volatile than its underlying securities and
ceases to have value if it is not exercised prior to its expiration date.
Changes in the value of a warrant do not necessarily correspond to changes in
the value of its underlying securities.
 
Fixed income securities with warrants attached to purchase equity securities
have many characteristics of convertible fixed income securities and their
prices may, to some degree, reflect the performance of the underlying equity
securities. Fixed income securities also may be issued with warrants attached to
purchase additional fixed income securities at the same coupon rate. A decline
in interest rates would permit a Portfolio to buy additional fixed income
securities at the favorable rate or to sell the warrants at a profit.
 
Warrants do not entitle a holder to dividends or voting rights with respect to
the underlying securities and do not represent any rights in the assets of the
issuing company. In addition, the value of warrants does not, necessarily in all
cases change to the same extent as the value of the underlying securities to
which they relate. These factors can make warrants more speculative than other
types of investments.
 
WHEN-ISSUED SECURITIES AND DELAYED-DELIVERY TRANSACTIONS
 
Each Portfolio may purchase securities on a when-issued or delayed delivery
basis. When such transactions are negotiated, the price of such securities is
fixed at the time of commitment, but delivery and payment for the securities may
take place a month or more after the date of the commitment to purchase. The
securities so purchased are subject to market fluctuation, and no interest
accrues to the purchaser during this period. Forward commitments involve a risk
of loss if the value of the security to be purchased declines prior to the
settlement date. The Adviser and the Sub-advisers do not believe that a
Portfolio's net asset value or income will be adversely affected by the purchase
of securities on a when-issued basis.
 
ZERO-COUPON FIXED INCOME SECURITIES
 
The Money Market Portfolio and the Growth and Income Portfolio may invest in
zero coupon fixed income securities, which are debt obligations that do not
entitle the holder to any periodic payment of interest prior to maturity or that
specify a future date when the securities begin to pay current interest.
 
                                       25
<PAGE>   61
 
Zero coupon fixed income securities are issued and traded at a discount from
their face amount or par value. This discount varies depending on prevailing
interest rates, the time remaining until cash payments begin, the liquidity of
the security, and the perceived credit quality of the issuer.
 
The discount on zero coupon fixed income securities ("original issue discount")
must be taken into income ratably by a Portfolio prior to the receipt of any
actual payments. Because the Portfolio must distribute substantially all of its
net income to its shareholders each year for income and excise tax purposes, the
Portfolio may have to dispose of portfolio securities under disadvantageous
circumstances to generate cash, or may be required to borrow, to satisfy its
corresponding Portfolio's distribution requirements.
 
The market prices of zero coupon fixed income securities generally are more
volatile than the prices of securities that pay interest periodically. Zero
coupon fixed income securities are likely to respond to changes in interest
rates to a greater degree than other types of debt securities having a similar
maturity and credit quality.
 
Custodial receipts issued in connection with zero coupon fixed income
securities, such as Certificates of Accrual on Treasury Securities ("CATS") and
Treasury Investment Growth Receipts ("TIGRS"), are not issued by the U.S.
Treasury, although the underlying bond represented by such receipt is a debt
obligation of the U.S. Treasury. Other zero coupon Treasury securities such as
Separately Traded Registered Interest and Principal Securities ("STRIPS") and
Coupon Under Back Entry Safekeeping ("CUBES") are direct obligations of the U.S.
Government.
 
                            INVESTMENT RESTRICTIONS
 
FUNDAMENTAL INVESTMENT RESTRICTIONS
 
The following investment restrictions are fundamental and may not be changed
with respect to any Portfolio without the approval of "a majority of the
outstanding voting securities" of that Portfolio. Under the 1940 Act and the
rules thereunder, a "majority of the outstanding voting securities" of a
Portfolio means the lesser of (a) 67% of the shares of that Portfolio present at
a meeting if the holders of more than 50% of the outstanding shares of that
Portfolio are present in person or by proxy and (b) more than 50% of the
outstanding shares of that Portfolio. Any investment restrictions which involve
a maximum percentage of securities or assets shall not be considered to be
violated unless an excess over the percentage occurs immediately after, and is
caused by an acquisition or encumbrance of securities or assets of, or
borrowings by or on behalf of, a Portfolio, as the case may be.
 
The Trust may not, on behalf of a Portfolio:
 
(1)     With respect to 75% of its total assets, purchase the securities of any
        issuer if such purchase would cause more than 5% of the value of a
        Portfolio's total assets to be invested in securities of any one issuer
        (except securities issued or guaranteed by the U.S. Government or any
        agency or instrumentality thereof), or purchase more than 10% of the
        outstanding voting securities of any one issuer;
 
(2)     Invest more than 25% of the value of its net assets in the securities
        (other than U.S. Government securities) of issuers in a single industry,
        except that this policy shall not limit investment by the Money Market
        Portfolio in obligations of U.S. banks (excluding their foreign
        branches);
 
(3)     Borrow money (including reverse repurchase agreements), except as a
        temporary measure for extraordinary or emergency purposes or, with
        respect to the Money Market Portfolio, to facilitate redemptions (and
        not for leveraging or investment, except with respect to reverse
        repurchase agreements and dollar roll transactions, to the extent such
        investments are permitted under a Portfolio's investment objectives and
        policies), provided that borrowings do not exceed an amount equal to
        33 1/3% of the current value of the Portfolio's assets taken at market
        value, less liabilities other than borrowings. If at any time a
        Portfolio's borrowings exceed this limitation due to a decline in net
        assets, such borrowings will be reduced within three days to the extent
        necessary to comply with this
 
                                       26
<PAGE>   62
 
        limitation. A Portfolio will not purchase investments once borrowed
        funds (including reverse repurchase agreements) exceed 5% of its total
        assets;
 
(4)     Make loans to other persons, except loans of Portfolio securities and
        except to the extent that the purchase of debt obligations in accordance
        with its investment objectives and policies or entry into repurchase
        agreements may be deemed to be loans;
 
(5)     Purchase or sell any commodity contract, except that each Portfolio
        (other than the Money Market Portfolio), to the extent permitted by its
        investment objectives and policies, may purchase and sell futures
        contracts based on debt securities, indexes of securities, and foreign
        currencies and purchase and write options on securities, futures
        contracts which it may purchase, securities indexes, and foreign
        currencies and purchase forward contracts. (Securities denominated in
        gold or other precious metals or whose value is determined by the value
        of gold or other precious metals are not considered to be commodity
        contracts.)
 
(6)     Underwrite securities issued by other persons except to the extent that,
        in connection with the disposition of its Portfolio investments, it may
        be deemed to be an underwriter under federal securities laws;
 
(7)     Purchase or sell real estate, although (with respect to Portfolios other
        than the Money Market Portfolio) it may purchase and sell securities
        which are secured by or represent interests in real estate,
        mortgage-related securities, securities of companies principally engaged
        in the real estate industry, and participation interests in pools of
        real estate mortgage loans, and it may liquidate real estate acquired as
        a result of default on a mortgage; and
 
(8)     Issue any class of securities which is senior to a Portfolio's shares of
        beneficial interest except as permitted under the 1940 Act or by order
        of the SEC.
 
NON-FUNDAMENTAL INVESTMENT RESTRICTIONS
 
The following investment restrictions are non-fundamental and may be changed by
the Trustees without shareholder approval.
 
The Trust may not, on behalf of a Portfolio:
 
(1)     Invest more than 15% (except 10% with respect to the Money Market
        Portfolio) of the net assets of a Portfolio (taken at market value) in
        illiquid securities, including repurchase agreements maturing in more
        than seven days;
 
(2)     Purchase securities on margin, except (with respect to all Portfolios
        other than the Money Market Portfolio) such short-term credits as may be
        necessary for the clearance of purchases and sales of securities, and
        except (with respect to all Portfolios other than the Money Market
        Portfolio) that it may make margin payments in connection with options,
        futures contracts, options on futures contracts, and forward foreign
        currency contracts and in connection with swap agreements;
 
(3)     Make short sales of securities unless such Portfolio (other than the
        Money Market Portfolio) owns an equal amount of such securities or owns
        securities which, without payment of any further consideration, are
        convertible into or exchangeable for securities of the same issue as,
        and equal in amount to, the securities sold short; and
 
(4)     Make investments for the purpose of gaining control of a company's
        management.
 
                                       27
<PAGE>   63
 
                            MANAGEMENT OF THE TRUST
 
TRUSTEES AND OFFICERS
 
The Board of Trustees ("Board") manages the business activities of the Trust in
accordance with Massachusetts law. The Board elects officers who are responsible
for the day-to-day operations of the Trust and who execute policies formulated
by the Board. The names and ages of the Trustees and officers of the Trust,
their addresses, present positions and principal occupations during the past
five years are set forth below.
 
   
<TABLE>
<CAPTION>
Name, Address, and Age                 Position(s) With The Trust  Principal Occupation During Past Five Years
- ----------------------                 --------------------------  -------------------------------------------
<S>                                    <C>                         <C>
Richard W. Scott*                      President, Principal        Executive Vice President and Chief
2929 Allen Parkway                     Executive Officer, and      Investment Officer of American General
Houston, Texas 77019                   Trustee                     Corporation since February 1998; prior
Date of Birth: 07/08/53                                            thereto, Vice Chairman, General Counsel and
                                                                   Chief Investment Officer or Executive Vice
                                                                   President of Western National Corporation
                                                                   from February 1994 to February 1998; prior
                                                                   thereto, a partner with Vinson & Elkins
                                                                   L.L.P.
 
Terry L. Swenson*                      Trustee and Vice President  Vice President -- Variable Products,
2929 Allen Parkway                                                 American General Annuity Insurance Company
Houston, Texas 77019                                               (the "Company") and The Variable Annuity
Date of Birth: 04/09/62                                            Life Insurance Company ("VALIC")
                                                                   (1997-Present); prior thereto, President of
                                                                   FMB Investment Services/FMB Insurance
                                                                   Agency (1996-1997); and prior thereto,
                                                                   Senior Vice President -- Director of Sales
                                                                   and Marketing of TCF Insurance/TCF
                                                                   Securities (1994-1996).
 
S. Tevis Grinstead                     Trustee                     Retired since 1993; prior thereto, a
c/o Vinson & Elkins L.L.P.                                         partner with Vinson & Elkins L.L.P.
2300 First City Tower
1001 Fannin
Houston, Texas 77002-6760
Date of Birth: 09/23/38
 
Hugh L. Hyde                           Trustee                     Owner, HLH Consulting Inc. since November,
952 Echo Lane, Suite 322                                           1994; from March 1, 1993 to September 15,
Houston, Texas 77024                                               1994, President and Director of Texas
Date of Birth: 04/09/43                                            Capital Bancshares, Inc. and its subsidiary
                                                                   bank, Texas Capital Bank, N.A.; prior
                                                                   thereto, a partner with KPMG Peat Marwick.
 
Melvin C. Payne                        Trustee                     Chairman & Chief Executive Officer of
1300 Post Oak Blvd.,                                               Carriage Services, Inc. since 1996 and
Suite 1500                                                         President and Chief Executive Officer from
Houston, Texas 77045                                               1991 to 1996.
Date of Birth: 01/06/43
</TABLE>
    
 
                                       28
<PAGE>   64
 
<TABLE>
<CAPTION>
Name, Address, and Age                 Position(s) With The Trust  Principal Occupation During Past Five Years
- ----------------------                 --------------------------  -------------------------------------------
<S>                                    <C>                         <C>
Brent C. Nelson                        Vice President              Senior Vice President, Controller and
2929 Allen Parkway                                                 Director, VALIC and the Company. Formerly,
Houston, Texas 77019                                               Vice President and Controller, VALIC
Date of Birth: 07/24/51                                            (1990-1994).
Peter V. Tuters                        Vice President and Senior   Executive Vice President, American General
2929 Allen Parkway                     Investment Officer          Investment Management, L.P., Vice President
Houston, Texas 77019                                               and Investment Officer, VALIC and the
Date of Birth: 04/18/52                                            Company; Senior Vice President and Chief
                                                                   Investment Officer, American General
                                                                   Corporation (1993-1998).
</TABLE>
 
   
<TABLE>
Maruti D. More                         Vice President --          Vice President, American General
2929 Allen Parkway                     Investments                Investment Management, L.P.; Vice
Houston, Texas 77019                                              President, Investments, VALIC (1998 to
Date of Birth: 02/02/44                                           present). Formerly, Managing Director,
                                                                  Marketable Securities, Paul Revere
                                                                  Investment Management Corporation (1993-
                                                                  1995.
<S>                                    <C>                        <C>
Cynthia A. Toles                       Vice President and         Senior Vice President, General Counsel
2929 Allen Parkway                     Secretary                  and Secretary, VALIC and the Company;
Houston, Texas 77019                                              Secretary and Assistant Treasurer,
Date of Birth: 03/28/51                                           VAMCO. Formerly, Senior Associate
                                                                  General Counsel and Secretary, VALIC
                                                                  (1990-1998).
 
Nori L. Gabert                         Vice President and         Associate General Counsel, VALIC.
2929 Allen Parkway                     Assistant Secretary        Formerly, Of Counsel, Winstead Sechrest
Houston, Texas 77019                                              & Minick P.C. (1997); Vice President and
Date of Birth: 08/15/53                                           Associate General Counsel of Van Kampen
                                                                  American Capital, Inc. (1981-1996).
 
Gregory R. Seward                      Treasurer                  Vice President -- Variable Product
2929 Allen Parkway                                                Accounting, VALIC and the Company.
Houston, Texas 77019                                              Formerly, Director of Fund Operations
Date of Birth: 06/27/56                                           and Assistant Controller, VALIC and the
                                                                  Company.
 
Cynthia A. Gibbons                     Assistant Vice President   Senior Compliance Analyst, VALIC.
2929 Allen Parkway
Houston, Texas 77019
Date of Birth: 12/06/67
 
Kurt R. Fredland                       Vice President             Vice President of AGA Investment
2929 Allen Parkway                                                Advisory Services, Inc. since September
Houston, Texas 77019                                              1994; prior thereto Assistant Vice
Date of Birth: 09/19/48                                           President -- Variable Annuity
                                                                  Administration, the Company from April
                                                                  1994; prior thereto, a financial
                                                                  consultant.
</TABLE>
    
 
*     Interested person of the Trust within the meaning of the 1940 Act.
 
Each Trustee who is not an employee, officer, or director of the Company, the
Adviser, or a Sub-adviser receives an annual fee of $7,500 and an additional fee
of $750 for each Trustees meeting attended. In addition, Trustees who are not
interested persons of the Trust and who are members of any board committee will
receive a separate fee of $750 for attendance at any committee meeting that is
held on a day on which no
 
                                       29
<PAGE>   65
 
Board meeting is held. As of December 31, 1998, none of the Trustees or officers
of the Trust owned any of the outstanding shares of the Trust.
 
The following table provides information regarding the compensation and benefits
earned by the Trustees for the most recently completed fiscal year.
 
                               COMPENSATION TABLE
                      Fiscal Year Ending December 31, 1998
 
   
<TABLE>
<CAPTION>
                                              Pension or
                                              Retirement                          Total
                                               Benefits        Estimated       Compensation
                               Aggregate      Accrued As        Annual       From Registrant
          Name of            Compensation       Part of      Benefits Upon   and Fund Complex
     Person, Position        From Trust(1)   Fund Expenses    Retirement     Paid to Trustee
     ----------------        -------------   -------------   -------------   ----------------
<S>                          <C>             <C>             <C>             <C>
Richard W. Scott                   None            None            None             None
President and Trustee
 
John A. Graf                       None            None            None             None
Trustee(2)
 
Alden W. Brosseau               $ 9,750            None            None          $ 9,750
Trustee(2)
 
Hugh L. Hyde                    $10,500            None            None          $10,500
Trustee
 
Melvin C. Payne                 $ 9,750            None            None          $ 9,750
Trustee
 
S. Tevis Grinstead              $10,500            None            None          $10,500
Trustee
</TABLE>
    
 
   
(1) For the year ended December 31, 1998, the Trust paid the Trustees' aggregate
compensation of $40,500.
    
(2) Messrs. Brosseau and Graf resigned their positions as Trustees of the Trust
on November 18, 1998 and February 24, 1999, respectively.
 
CONTROLLING SHAREHOLDER
 
Shares of the Portfolios are issued and redeemed in connection with investments
in and payments under variable annuity contracts issued through the Company's
separate account ("Separate Account"). As of December 31, 1998, the Separate
Account, 205 E. 10th Avenue, Amarillo, Texas 79101, owned of record 100% of the
shares of each Portfolio of the Trust. The Separate Account is organized under
the laws of Texas. When a general or special meeting of shareholders is called
and matters are to be voted upon, contract owners and participants having values
allocated to any of the Portfolios, as provided in their variable annuity
contracts, may instruct the Separate Account as to how they wish to vote, and
the Separate Account will vote Portfolio shares in accordance with contract
owners' and participants' instructions.
 
INVESTMENT ADVISER
 
Under an Investment Advisory Agreement, dated August 23, 1995, the Adviser
manages the business and affairs of the Portfolios and the Trust, under the
supervision of the Trustees. The Adviser is an indirect
 
                                       30
<PAGE>   66
 
subsidiary of Western National Corporation, a Delaware corporation ("Western
National"), which is a wholly-owned subsidiary of AGC Life Insurance Company, a
Missouri domiciled life insurer that is wholly-owned by American General
Corporation, a Texas corporation.
 
Under the Investment Advisory Agreement (the "Agreement"), the Adviser is
obligated to formulate a continuing program for the investment of the assets of
each Portfolio of the Trust in a manner consistent with each Portfolio's
investment objectives, policies, and restrictions, and to determine, from time
to time, securities to be purchased, sold, retained, or lent by the Trust and to
implement those decisions. The Agreement also provides that the Adviser shall
manage the Trust's business and affairs and provide such services as are
required for effective administration of the Trust as are now provided by
employees or other agents engaged by the Trust. The Investment Advisory
Agreement further provides that the Adviser shall furnish the Trust with office
space and necessary personnel, pay ordinary office expenses, pay all executive
salaries of the Trust, and furnish, without expense to the Trust, the services
of such members of its organization as may be duly elected officers or Trustees
of the Trust.
 
Under the Agreement, the Trust is responsible for all its other expenses
including, but not limited to, the following expenses: legal, auditing, or
accounting expenses; Trustees' fees and expenses; insurance premiums; brokers'
commissions; taxes and governmental fees; expenses of issue or redemption of
shares; expenses of registering or qualifying shares for sale; reports and
notices to shareholders and fees and disbursements of custodians, transfer
agents, registrars, shareholder servicing agents, and dividend disbursing
agents; and certain expenses with respect to membership fees of industry
associations.
 
The Agreement provides that the Adviser may retain sub-advisers, at the
Adviser's own cost and expense, for the purpose of managing the investment of
the assets of one or more Portfolios. The Agreement provides that neither the
Adviser nor any director, officer, or employee of Adviser will be liable for any
loss suffered by the Trust in the absence of willful misfeasance, bad faith,
gross negligence, or reckless disregard of obligations and duties. In addition,
the Agreement provides for indemnification of the Adviser by the Trust.
 
The Agreement may be terminated without penalty by vote of the Trustees, as to
any Portfolio by the shareholders of that Portfolio, or by the Adviser on 60
days' written notice. The Agreement also terminates without payment of any
penalty in the event of its assignment. In addition, the Agreement may be
amended only by a vote of the shareholders of the affected Portfolio(s) and
provides that it will continue in effect from year to year only so long as such
continuance is approved at least annually with respect to each Portfolio by vote
of either the Trustees or the shareholders of the Portfolio, and, in either
case, by a majority of the Trustees who are not "interested persons" of the
Adviser. In each of the foregoing cases, the vote of the shareholders is the
affirmative vote of a "majority of the outstanding voting securities" as defined
in the 1940 Act.
 
As full compensation for its services under the Agreement, the Trust pays the
Adviser a monthly fee at the following annual rates based on the average daily
net assets of each Portfolio: Growth and Income Portfolio, .75% of average daily
net assets; International Equity Portfolio, .90% of average daily net assets;
EliteValue Portfolio, .65% of average daily net assets; Growth Equity Portfolio,
 .61% of average daily net assets; Money Market Portfolio, .45% of average daily
net assets; U.S. Government Securities Portfolio, .475% of average daily net
assets; and Emerging Growth Portfolio, .75% of average daily net assets.
 
The Adviser voluntarily agreed to waive that portion of its advisory fee in
excess of the amount payable by the Adviser to each Sub-adviser pursuant to the
respective sub-advisory agreements for each Portfolio until May 1, 1998. In
addition, the Company, an affiliate of the Adviser, has undertaken to bear all
operating expenses of each Portfolio, excluding the compensation of the Adviser,
that exceed .12% of each Portfolio's average daily net assets until May 1, 2000.
 
                                       31
<PAGE>   67
 
For the years ended December 31, 1998, 1997 and 1996, respectively, the Trust
paid the Adviser advisory fees set forth in the following table.
 
<TABLE>
<CAPTION>
                                                         1998           1997           1996
                                                         ----           ----           ----
<S>                                                     <C>            <C>            <C>
Elite Value Portfolio                                   $84,637        $21,970        $ 3,553
Emerging Growth Portfolio                                51,549         17,886          4,290
Growth Equity Portfolio                                  56,941         18,763          7,072
Growth and Income Portfolio                              76,665         24,528          9,659
International Equity Portfolio                           42,177         23,693         11,530
Money Market Portfolio                                   19,782          5,909          1,248
U.S. Government Securities Portfolio                     22,372          5,756          2,076
</TABLE>
 
For the years ended December 31, 1998, 1997 and 1996, respectively, the Adviser
waived advisory fees as follows:
 
<TABLE>
<CAPTION>
                                                         1998           1997           1996
                                                         ----           ----           ----
<S>                                                     <C>            <C>            <C>
Elite Value Portfolio                                   $ 9,231        $13,732        $ 6,128
Emerging Growth Portfolio                                 5,221          8,943          5,171
Growth Equity Portfolio                                   6,950         13,030          9,010
Growth and Income Portfolio                               6,992         12,263          9,918
International Equity Portfolio                            3,842          9,113         10,342
Money Market Portfolio                                    4,461          7,387          1,984
U.S. Government Securities Portfolio                      3,584          6,395          7,227
</TABLE>
 
INVESTMENT SUB-ADVISERS
 
   
Pursuant to Investment Sub-advisory Agreements (the "Sub-advisory Agreements")
with each Sub-adviser, the Adviser has engaged Credit Suisse Asset Management
("CSAM of New York") to provide sub-advisory services to the Growth and Income
Portfolio, Credit Suisse Asset Management Ltd. ("CSAM") to provide sub-advisory
services for the International Equity Portfolio, OpCap Advisors ("OpCap") to
provide sub-advisory services for the EliteValue Portfolio, State Street Global
Advisors ("State Street") to provide sub-advisory services for the Growth Equity
Portfolio and the Money Market Portfolio, and Van Kampen Asset Management, Inc.
("Van Kampen") to provide sub-advisory services for the Emerging Growth
Portfolio. CSAM of New York, Credit Suisse, OpCap, State Street and Van Kampen
(collectively, the "Sub-advisers") are subject to the control, supervision and
direction of the Adviser, which retains responsibility for the overall
management of the Portfolios.
    
 
Pursuant to the Sub-advisory Agreements and subject to the Adviser's control,
supervision and direction, the Sub-advisers manage the investment and
reinvestment of the assets of the respective Portfolio, including the evaluation
of pertinent economic, statistical, financial and other data, and the
determination of industries and companies to be represented in the Portfolios.
 
The Sub-advisory Agreements may be continued with respect to any of the
Portfolios if approved, after the initial two year term, at least annually by
the vote of the Trustees of the Trust who are not parties to the Investment
Sub-advisory Agreements or interested persons of any such parties, cast in
person at a meeting
 
                                       32
<PAGE>   68
 
called for the purpose of voting on such approval and by a vote of a majority of
the Trustees of the Trust or a majority of the relevant Portfolio's outstanding
voting securities.
 
The Sub-advisory Agreements may be terminated at any time by the Adviser, the
relevant Sub-adviser, the Trustees of the Trust, or by a vote of a majority of
the outstanding voting securities of the relevant Portfolio, on 60 days' written
notice to the other entities, without the payment of any penalty.
 
The Investment Sub-advisory Agreements provide that the Sub-advisers shall not
be liable to the Adviser or the Trust for any act or omission in rendering
services under the Investment Sub-advisory Agreements, so long as there has been
no wilful misfeasance, bad faith, gross negligence or reckless disregard of
obligations or duties on the part of the Sub-advisers.
 
CSAM of New York is the Sub-adviser for the Growth and Income Portfolio. CSAM of
New York is a wholly-owned subsidiary of Credit Suisse Group, a Swiss
Corporation. Credit Suisse Group is one of the largest global financial service
group based in Switzerland. Under the Investment Sub-advisory Agreement with
CSAM of New York, the Adviser pays CSAM of New York, for the services rendered
and expenses paid by CSAM of New York, a monthly fee computed at the annual rate
of .50% of the average daily net assets of the Growth and Income Portfolio.
 
CSAM is the Sub-adviser for the International Equity Portfolio. CSAM is a
wholly-owned subsidiary of Credit Suisse Group. Under the Sub-advisory Agreement
with CSAM, the Adviser pays CSAM, for the services rendered and expenses paid by
CSAM, a monthly fee computed at the annual rate of .65% of the average daily net
assets of the International Equity Portfolio.
 
OpCap is the Sub-adviser for the EliteValue Portfolio. OpCap is a majority-owned
subsidiary of Oppenheimer Capital, a registered investment adviser whose
employees perform all services provided to the Portfolio by OpCap. Oppenheimer
Financial Corp., a holding company, is a 1% general partner of OPCAP and holds a
one-third managing general partner interest in Oppenheimer Capital. Oppenheimer
Capital, L.P., a Delaware limited partnership whose units are traded on the New
York Stock Exchange ("NYSE") and of which Oppenheimer Financial Corp. is the
sole 1% general partner, owns the remaining two-thirds interest.
 
Oppenheimer Capital and its subsidiaries are owned by PIMCO Advisors L.P.
("PIMCO Advisors"), a registered investment adviser. PIMCO Partners, G.P.
("PIMCO GP") owns approximately 42.83% and 66.3% of the total outstanding Class
A and Class B units of limited partnership interest ("Units") of PIMCO Advisors
and is PIMCO Advisors' sole general partner. PIMCO GP is a California general
partnership with two general partners. The first of these is Pacific Investment
Management Company, which is a California Corporation and is wholly-owned by
Pacific Financial Asset Management Company, a direct subsidiary of Pacific Life
Insurance Company ("Pacific Life"). PIMCO Partners L.L.C. ("PPLLC"), a
California limited liability company, is the second , and managing general
partner of PIMCO GP. PPLLC's members are the Managing Directors ("PIMCO
Managers") of Pacific Investment Management Company, a subsidiary of PIMCO
Advisors (the "PIMCO Subpartnership").
 
PIMCO Advisors is governed by an Operating Board and an Equity Board. Governance
matters are allocated generally to the Operating Board and the Operating Board
delegates to the Operating Committee the authority to manage day-to-day
operations of PIMCO Advisors. The Operating Board is composed of twelve members,
including, the chief executive officer of PIMCO Subpartnership as Chairman and
six PIMCO Managers designated by the PIMCO Subpartnership.
 
The authority of PIMCO Advisors Operating Board and Operating Committee to take
certain specified actions is subject to the approval of PIMCO Advisors' Equity
Board. Equity Board approval is required for certain major transactions (e.g.,
issuance of additional PIMCO Advisors Units and appointment of PIMCO Advisors
chief executive officer). In addition, the Equity Board has jurisdiction over
matters such as actions which would have a material effect upon PIMCO Advisors
business taken as a whole and (after an appeal from an Operating Board decision)
matters likely to have a material adverse economic effect on any subpartnership
of PIMCO Advisors. The Equity Board is composed of twelve members, including the
chief executive officer of PIMCO Advisors, three members designated by a
subsidiary of Pacific Life, the chairman of the Operating Board and two members
designated by PPLLC.
                                       33
<PAGE>   69
 
Because of its power to appoint (directly or indirectly) seven of the twelve
members of the Operating Board, as described above, the PIMCO Subpartnership may
be deemed to control PIMCO Advisors. Because of direct or indirect power to
appoint 25% of the members of the Equity Board, (i) Pacific Life and (ii) the
PIMCO Managers and/or the PIMCO Subpartnership may each be deemed, under
applicable provisions of the 1940 Act, to control PIMCO Advisors. Pacific Life,
the PIMCO Subpartnership and the PIMCO Managers disclaim such control.
 
Under the Sub-advisory Agreement with OpCap, the Adviser pays OpCap, for the
services rendered and expenses paid by OpCap, a monthly fee computed at the
annual rate of .40% of the average daily net assets of the EliteValue Portfolio.
 
State Street is the Sub-adviser for the Growth Equity Portfolio and the Money
Market Portfolio. State Street is the investment management division of State
Street Bank and Trust Company, which is a wholly-owned subsidiary of State
Street Boston Corporation, a publicly held bank holding company. Under the
Sub-advisory Agreement with State Street, the Adviser pays State Street, for the
services rendered and expenses paid by State Street, a monthly fee computed at
the annual rate of .36% of the average daily net assets of the Growth Equity
Portfolio and .20% of the Money Market Portfolio.
 
Van Kampen is the Sub-adviser for the Emerging Growth Portfolio. Van Kampen is a
wholly-owned subsidiary of Van Kampen Inc., an indirect wholly-owned subsidiary
of Morgan Stanley, Dean Witter, Discover & Co., which is a holding company
engaged, through its subsidiaries, in a wide range of financial services. Under
the Sub-advisory Agreement with Van Kampen, the Adviser pays Van Kampen, for the
services rendered and expenses paid by Van Kampen, a monthly fee computed at the
annual rate of .50% of the average daily net assets of the Emerging Growth
Portfolio.
 
TRUST ADMINISTRATION
 
Under the terms of a Transfer Agency and Service Agreement ("Transfer Agency
Agreement") dated May 31, 1995, between the Trust and State Street Bank and
Trust Company (the "Transfer Agent"), the Transfer Agent serves as the Trust's
transfer agent, dividend disbursing agent and agent in connection with any
accumulation, open account and/or similar plans. Under the Transfer Agency
Agreement, the services performed by the Transfer Agent include, but are not
limited to: (i) receiving orders for the purchase of shares and delivering
payment therefor to the Trust's Custodian; (ii) issuing the appropriate number
of shares pursuant to purchase orders and holding such shares in the appropriate
accounts; (iii) receiving redemption requests and redemption directions and
delivering the appropriate documentation to the Custodian; (iv) executing the
transactions specified in (i)-(iii) directly with broker dealers authorized by
the Trust who are deemed to be acting on behalf of the Trust; (v) paying
redemption proceeds; (vi) effecting transfers of shares; (vii) preparing and
transmitting dividend and distribution payments; and (viii) preparing and
mailing confirmation forms and statements of accounts in connection with the
purchase and redemption of shares. In consideration for the services provided by
the Transfer Agent under the Transfer Agency Agreement, the Trust pays the
Transfer Agent a monthly fee equal to $250 per Portfolio plus certain additional
transaction costs, and the Transfer Agent's out-of-pocket costs incurred in
connection with the provision of services. For each of the fiscal years ended
December 31, 1998, 1997 and 1996, the Trust paid the Transfer Agent fees under
the Transfer Agency Agreement in an amount equal to $29,535, $33,093 and
$22,259, respectively.
 
Under the terms of a Sub-administration Agreement between the Trust, the Adviser
and State Street Bank and Trust Company dated May 31, 1995, the Adviser has
retained State Street (the "Sub-Administrator") to provide reporting and
accounting services to the Trust. Under the Sub-administration Agreement, the
services performed by the Sub-Administrator include, but are not limited to, (i)
overseeing the determination and publication of the net asset value for each
Portfolio; (ii) overseeing the maintenance of books and records required under
the 1940 Act; (iii) preparing the Trust's federal, state and local income tax
returns for review by the Trust's independent public accountants; (iv) reviewing
the appropriateness of and arranging for payment of the Trust's expenses; (v)
preparing for review and approval by officers of the Trust financial information
for the Trust's semi-annual and annual reports, proxy statements and other
communications with shareholders; (vi) preparing reports related to the business
and affairs of the Trust as may be mutually agreed
 
                                       34
<PAGE>   70
 
upon; (vii) overseeing and reviewing calculation of fees paid to the Adviser,
the custodian and the transfer agent; and (viii) responding to or referring the
Trust's officers or transfer agent inquiries relating to the Trust. In
consideration for the services provided by the Sub-Administrator under the
Sub-administration Agreement, the Trust or the Adviser pays the
Sub-Administrator an annual fee of .06% for the first $125 million in assets or
the first Portfolio, .04% for the next $125 million in assets or the next
Portfolio, and .02% per Portfolio thereafter, subject to a minimum of $50,000
per Portfolio, plus the Sub-Administrator's out-of-pocket costs incurred in
connection with the provision of services. For each of the fiscal years ended
December 31, 1998, 1997 and 1996, the Trust paid the Sub-Administrator fees
under the Sub-administration Agreement in an amount equal to $375,200, $371,151
and $82,742, respectively.
 
INVESTMENT DECISIONS
 
Investment decisions for the Portfolios and for the other investment advisory
clients of the Sub-advisers are made with a view to achieving their respective
investment objectives and after consideration of such factors as their current
holdings, availability of cash for investment, and the size of their investments
generally. Frequently, a particular security may be bought or sold for only one
client or in different amounts and at different times for more than one, but
less than all clients. Likewise, a particular security may be bought for one or
more clients when one or more other clients are selling the security. In
addition, purchases or sales of the same security may be made for two or more
clients of a Sub-adviser on the same day. In such event, such transactions will
be allocated among the clients in a manner believed by the Sub-adviser to be
equitable to each. In some cases, this procedure could have an adverse effect on
the price or amount of the securities purchased or sold by the Trust. Purchase
and sale orders for the Trust may be combined with those of other clients of a
Sub-adviser in the interest of achieving the most favorable net results for the
Trust.
 
BROKERAGE AND RESEARCH SERVICES
 
Transactions on U.S. stock exchanges and other agency transactions involve the
payment by the Trust of negotiated brokerage commissions. Such commissions vary
among different brokers. Also, a particular broker may charge different
commissions according to such factors as the difficulty and size of the
transaction. Transactions in foreign securities often involve the payment of
fixed brokerage commissions, which are generally higher than those in the United
States. There is generally no stated commission in the case of securities traded
in the over-the-counter markets, but the price paid by the Trust usually
includes an undisclosed dealer commission or mark-up. In underwritten offerings,
the price paid by the Trust includes a disclosed, fixed commission or discount
retained by the underwriter or dealer. The Sub-advisers will place all orders
for the purchase and sale of portfolio securities for the Trust and buy and sell
securities for the Trust through a substantial number of brokers and dealers. In
so doing, the Sub-advisers will use their best efforts to obtain for the Trust
the best price and execution available. In seeking the best price and execution,
the Sub-advisers, having in mind the Trust's best interests, will consider all
factors they deem relevant, including, by way of illustration, price; the size
of the transaction; the nature of the market for the security; the amount of the
commission; the timing of the transaction taking into account market prices and
trends; the reputation, experience, and financial stability of the broker-dealer
involved; and the quality of service rendered by the broker-dealer in other
transactions.
 
It has for many years been a common practice in the investment advisory business
for advisers of investment companies and other institutional investors to
receive research, statistical, and quotation services from broker-dealers who
execute portfolio transactions for the clients of such advisers. Consistent with
this practice, the Sub-advisers may receive research, statistical, and quotation
services from any broker-dealers with whom they place the Trust's portfolio
transactions. These services, which in some cases may also be purchased for
cash, include such matters as general economic and security market reviews,
industry and company reviews, evaluations of securities, and recommendations as
to the purchase and sale of securities. Some of these services may be of value
to the Sub-advisers and/or their affiliates in advising various other clients
(including the Trust), although not all of these services are necessarily useful
and of value in managing the Trust. The management fees paid by the Trust are
not reduced because the Sub-advisers and/or their affiliates may receive such
services.
 
                                       35
<PAGE>   71
 
As permitted by Section 28(e) of the Securities Exchange Act of 1934, a
Sub-adviser may cause a Portfolio to pay a broker-dealer who provides brokerage
and research services to the Sub-adviser an amount of disclosed commission for
effecting a securities transaction for the Portfolio in excess of the commission
which another broker-dealer would have charged for effecting that transaction
provided that the Sub-adviser determines in good faith that such commission was
reasonable in relation to the value of the brokerage and research services
provided by such broker-dealer, viewed in terms of that particular transaction
or in terms of all of the accounts over which investment discretion is so
exercised. A Sub-adviser's authority to cause a Portfolio to pay any such
greater commissions is also subject to such policies as the Adviser or the
Trustees may adopt from time to time.
 
During the fiscal years ended December 31, 1998, 1997 and 1996, each Portfolio
paid aggregate brokerage commissions in the amounts shown in the table below:
 
<TABLE>
<CAPTION>
                                         1998       1997       1996
                                         ----       ----       ----
<S>                                     <C>        <C>        <C>
EliteValue Portfolio                    $ 4,876    $ 6,958    $ 2,448
Emerging Growth Portfolio                 3,015      5,131      3,423
Growth Equity Portfolio                  11,612     10,851      4,082
Growth and Income Portfolio               2,011      7,681     13,588
International Equity Portfolio            4,398     14,086     14,302
Money Market Portfolio                       --         --         --
U.S. Government Securities Portfolio         --         --         --
</TABLE>
 
   
For the year ended December 31, 1998, Growth Equity Portfolio, International
Equity Portfolio, Emerging Growth Portfolio and EliteValue Portfolio paid
brokerage commissions of $2,540, $104, $518, and $1,446, respectively, to CS
First Boston Corporation, and $0, $145, $114 and $0, respectively, to Salomon
Brothers Inc., and Growth Equity Portfolio paid brokerage commission of $25, to
State Street Corporation, affiliated brokers, for portfolio transactions
executed on behalf of the Portfolios.
    
 
   
For the year ended December 31, 1997, Growth Equity Portfolio, International
Equity Portfolio, Emerging Growth Portfolio and EliteValue Asset Allocation
Portfolio paid brokerage commissions of $485, $126, $217 and $166, respectively,
to CS First Boston Corporation and $607, $169, $483 and $185, respectively, to
Salomon Brothers Inc., affiliated brokers, for portfolio transactions executed
on behalf of the Portfolios.
    
 
   
For the year ended December 31, 1996, Growth Equity Portfolio, International
Equity Portfolio, Emerging Growth Portfolio and EliteValue Asset Allocation
Portfolio paid brokerage commissions of $117, $890, $12 and $252, respectively,
to CS First Boston Corporation and $76, $262, $106 and $6, respectively, to
Salomon Brothers Inc., affiliated brokers, for portfolio transactions executed
on behalf of the Portfolios.
    
 
                OFFERING, PURCHASE AND REDEMPTION OF FUND SHARES
 
The Trust's shares are sold exclusively to the Separate Account.
 
The Separate Account of the Company places orders to purchase and redeem shares
of each Portfolio based on, among other things, the amount of premium payments
to be invested and surrender and transfer requests to be effected on that day
pursuant to the Contracts issued by the Company. Orders received by the Trust
are effected on days on which the New York Stock Exchange (the "NYSE") is open
for trading, at the net asset value per share next determined after receipt of
the order, except that, in the case of the Money Market Portfolio, purchases
will not be effected until the next determination of net asset value after
federal funds have been made available to the Trust. For orders received before
4:00 p.m., New York time, such purchases and redemptions of shares of each
Portfolio are effected at the respective net asset values per share determined
as of 4:00 p.m., New York time on that day (see "Determination of Net Asset
Value"). Payment for redemptions will be made within seven days after receipt of
a redemption request in good order. No fee is charged the Separate Account of
the Company when it redeems Portfolio shares. The Trust may suspend the sale of
shares at any time and may refuse any order to purchase shares.
 
                                       36
<PAGE>   72
 
As explained in the prospectus for the Contracts, payments of surrender values,
as well as lump sum payments available under the annuity options of the
Contracts, may be suspended or postponed at any time when the redemption of
shares is suspended. Normally, the Trust redeems Portfolio shares within seven
days of receipt of request therefor, but may postpone redemptions beyond seven
days when: (1) the NYSE is closed for other than weekends and customary
holidays, or trading on the NYSE becomes restricted; (2) an emergency exists
making disposal or valuation of a Portfolio's assets not reasonably practicable;
or (3) the SEC has so permitted by order for the protection of the Trust's
shareholders.
 
Net asset value per share is determined by dividing the net assets of a
Portfolio by the number of that Portfolio's outstanding shares at such time.
 
                        DETERMINATION OF NET ASSET VALUE
 
The net asset value per share of each Portfolio is determined daily as of 4:00
p.m., New York time, on each day the NYSE is open for trading. The NYSE is
normally closed on the following national holidays: New Year's Day, Martin
Luther King's Birthday, President's Day, Good Friday, Memorial Day, Independence
Day, Labor Day, Thanksgiving, and Christmas. The Trust is closed the day after
Thanksgiving even though the NYSE is open.
 
There may be dates when the NYSE is open for business and the Trust is not. The
day after Thanksgiving is the only such date. On such date, contract owners will
not have access to their accounts and therefore, no transactions will be
processed on such date. The Trust will be closed for business each date the NYSE
is closed for business.
 
   
                          ACCOUNTING AND TAX TREATMENT
    
 
CALLS AND PUTS
 
When a Portfolio writes a call or put option, an amount equal to the premium
received by it is included in that Portfolio's Statement of Assets and
Liabilities as an asset and as an equivalent liability. The amount of the
liability is subsequently "marked to market" to reflect the current market value
of the option written. The current market value of a written option is the last
sale price on the principal Exchange on which such option is traded. If a call
option which a Portfolio has written either expires on its stipulated expiration
date, or if a Portfolio enters into a closing purchase transaction, it realizes
a gain (or loss if the cost of the closing transaction exceeds the premium
received when the option was sold) without regard to any unrealized gain or loss
on the underlying security, and the liability related to such option is
extinguished. If a call option which a Portfolio has written is exercised, the
Portfolio realizes a capital gain or loss from the sale of the underlying
security and proceeds from such sale are increased by the premium originally
received.
 
The premium paid by a Portfolio for the purchase of a put option is included in
the asset section of its Statement of Assets and Liabilities as an investment
and subsequently adjusted daily to the current market value of the option. For
example, if the current market value of the option exceeds the premium paid, the
excess would be unrealized appreciation and, conversely, if the premium exceeds
the current market value, such excess would be unrealized depreciation. The
current market value of a purchased option is the last sale price on the
principal Exchange on which such option is traded. If a put option which a
Portfolio has purchased expires unexercised it realizes a capital loss equal to
the cost of the option. If a Portfolio exercises a put option, it realizes a
capital gain or loss from the sale of the underlying security and the proceeds
from such sale will be decreased by the premium originally paid.
 
FINANCIAL FUTURES CONTRACTS
 
Accounting for financial futures contracts will be in accordance with generally
accepted accounting principles. Initial margin deposits made upon entering into
financial futures contracts will be recognized as assets due from the FCM (the
Portfolio's agent in acquiring the futures position). During the period the
financial futures contract is open, changes in the value of the contract will be
recognized as unrealized gains or losses by
                                       37
<PAGE>   73
 
"marking-to-market" on a daily basis to reflect the market value of the contract
at the end of each day's trading. Variation (or maintenance) margin payments
will be made or received, depending upon whether gains or losses are incurred.
Financial futures contracts held by a Portfolio at the end of each fiscal year
will be required to be "marked to market" for federal income tax purposes (that
is, treated as having been sold at market value).
 
SUBCHAPTER M OF THE INTERNAL REVENUE CODE OF 1986
 
Each Portfolio of the Trust intends to qualify annually as a regulated
investment company under Subchapter M of the Code. A Portfolio must meet several
requirements to obtain and maintain its status as a regulated investment
company. Among these requirements are that: (i) at least 90% of a Portfolio's
gross income be derived from dividends, interest, payments with respect to
securities loans and gains from the sale or disposition of securities; and (ii)
at the close of each quarter of a Portfolio's taxable year (a) at least 50% of
the value of the Portfolio's assets consist of cash, government securities,
securities of other regulated investment companies and other securities (such
other securities of any one issuer being not greater than 5% of the value of a
Portfolio and the Portfolio holding not more than 10% of the outstanding voting
securities of any such issuer) and (b) not more than 25% of the value of a
Portfolio's assets be invested in the securities of any one issuer (other than
United States government securities or securities of other regulated investment
companies). Each Portfolio of the Trust is treated as a separate entity for
federal income tax purposes.
 
The Internal Revenue Service ("Service") has ruled publicly that an
exchange-traded call option is a security for purposes of the 50% of assets test
and that its issuer is the issuer of the underlying security, not the writer of
the option, for purposes of the diversification requirements. It has ruled
privately (at the request of a taxpayer other than the Trust) that income from
closing financial futures contracts is considered gain from a disposition of
securities for purposes of the 90% of gross income test. However, since
taxpayers other than the taxpayer requesting a particular private ruling are not
entitled to rely on such ruling, the Trust intends to keep its Portfolios'
activity in futures contracts and options at a low enough volume such that gains
from closing futures contracts will not exceed 10% of a Portfolio's gross income
until the Service rules publicly on the issues or the Trust is otherwise
satisfied that those gains are qualifying income.
 
If a Portfolio fails to qualify as a regulated investment company or fails to
satisfy the 90% distribution requirement in any taxable year, the Portfolio
would be taxed as an ordinary corporation on its taxable income. To qualify
again as a regulated investment company in a subsequent year, the Portfolio may
be required to pay an interest charge on 50% of its earnings and profits
attributable to non-regulated investment company years and would be required to
distribute such earnings and profits to shareholders (less any interest charge).
In addition, if the Portfolio failed to qualify as a regulated investment
company for its first taxable year or, if immediately after qualifying as a
regulated investment company for any taxable year, it failed to qualify for a
period greater than one taxable year, the Portfolio would be required to
recognize any net built-in gains (the excess of aggregate gains, including items
of income, over aggregate losses that would have been realized if it had been
liquidated) in order to qualify as a regulated investment company in a
subsequent year.
 
SECTION 817(h) OF THE CODE
 
Each of the Portfolios intends to comply with Section 817(h) of the Code and the
regulations issued thereunder. Section 817(h) of the Code and Treasury
Department regulations thereunder impose certain diversification requirements on
variable annuity contracts based upon segregated asset accounts. These
requirements are in addition to the diversification requirements of Subchapter M
and the 1940 Act and may affect the securities in which a Portfolio may invest.
Failure to meet the requirements of Section 817(h) could result in immediate
taxation of the Contract Owner to the extent of appreciation on investments
under the Contract.
 
The Section 817(h) diversification requirements do not apply to pension plan
contracts. "Pension plan contracts" for these purposes generally means annuity
contracts issued with respect to plans qualified under Section 401(a) or 403(a)
of the Code, Section 403(b) annuities, Individual Retirement Accounts,
Individual Retirement Annuities and annuities issued with respect to Section 457
plans.
 
                                       38
<PAGE>   74
 
The Secretary of the Treasury may, in the future, issue additional regulations
that will prescribe the circumstances in which a contract owner's control of the
investments of the separate accounts investing in the Trust may cause the
contract owner to be taxable with respect to assets allocated to the separate
account, before distributions are actually received under the Contract.
 
In order to comply with the requirements of Section 817(h) and the regulations
thereunder, the Trust may find it necessary to take action to ensure that a
contract funded by the Trust continues to qualify as such under federal tax
laws. The Trust, for example, may be required to alter the investment objectives
of a Portfolio or Portfolios, or substitute the shares of one Portfolio for
those of another. No such change of investment objectives or substitution of
securities will take place without notice to the shareholders of the affected
Portfolio and without prior approval of the SEC, to the extent legally required.
 
It is not feasible to comment on all of the federal income tax consequences
concerning the Portfolios. Each owner of a Contract funded by the Trust should
consult a qualified tax adviser for more complete information. The reader should
refer to the appropriate prospectus related to his or her Contracts for a more
complete description of the taxation of the separate account and of the owner of
the particular Contract.
 
                          DIVIDENDS AND DISTRIBUTIONS
 
The net investment income of the Money Market Portfolio is determined as of the
close of trading on the NYSE (generally 4 p.m., New York time) on each day on
which the NYSE is open for business. All of the net investment income so
determined normally will be declared daily as a dividend to shareholders of
record as of the close of trading on the NYSE after the purchase and redemption
of shares. Unless the business day before a weekend or holiday is the last day
of an accounting period, the dividend declared on that day will include an
amount in respect of the Portfolio's income for the subsequent non-business day
or days. No daily dividend will include any amount of net income in respect of a
subsequent semi-annual accounting period. Dividends commence on the next
business day after the date of purchase. Dividends declared during any month
will be invested as of the close of business on the last calendar day of that
month (or the next business day after the last calendar day of the month if the
last calendar day of the month is a non-business day) in additional shares of
the Portfolio at the net asset value per share, normally $1, determined as of
the close of business on that day, unless payment of the dividend in cash has
been requested.
 
Net income of the Money Market Portfolio consists of all interest income accrued
on portfolio assets less all expenses of the Portfolio and amortized market
premium. Amortized market discount is included in interest income. The Portfolio
does not anticipate that it will normally realize any long-term capital gains
with respect to its portfolio securities.
 
Normally the Money Market Portfolio will have a positive net income at the time
of each determination thereof. Net income may be negative if an unexpected
liability must be accrued or a loss realized. If the net income of the Portfolio
determined at any time is a negative amount, the net asset value per share will
be reduced below $1 unless one or more of the following steps, for which the
Trustees have authority, are taken: (a) reducing the number of shares in each
shareholder's account; (b) offsetting each shareholder's pro rata portion of
negative net income against the shareholder's accrued dividend account or
against future dividends; or (c) combining these methods in order to seek to
maintain the net asset value per share at $1. The Trust may endeavor to restore
the Portfolio's net asset value per share to $1 by not declaring dividends from
net income on subsequent days until restoration, with the result that the net
asset value per share will increase to the extent of positive net income which
is not declared as a dividend.
 
Should the Money Market Portfolio incur or anticipate, with respect to its
portfolio, any unusual or unexpected significant expense or loss which would
affect disproportionately the Portfolio's income for a particular period, the
Trustees would at that time consider whether to adhere to the dividend policy
described above or to revise it in light of the then-prevailing circumstances in
order to ameliorate, to the extent possible, the disproportionate effect of such
expense or loss on then-existing shareholders. Such expenses or losses may,
nevertheless, result in a shareholder receiving no dividends for the period
during which the shares are held, and receiving, upon redemption, a price per
share lower than that which was paid.
 
                                       39
<PAGE>   75
 
Each of the Portfolios, other than the Money Market Portfolio, will declare and
distribute dividends from net investment income, if any, and will distribute its
net realized capital gains, if any, at least annually. Both dividends and
capital gain distributions will be made in shares of such Portfolios unless an
election is made on behalf of a separate account to receive dividends and
capital gain distributions in cash.
 
                            PERFORMANCE INFORMATION
 
The total return of a Portfolio is the total return of the Portfolio before
expenses ("Portfolio Total Return"). The Trust may compare Portfolio Total
Return to the total return of the Portfolio's benchmark index ("Index Total
Return"). The difference between Portfolio Total Return and Index Total Return
is referred to as "tracking difference." Tracking difference represents the
amount that the return on the investment portfolio (which results from the
Adviser or the Sub-adviser's investment selection) deviates from its benchmark's
Index Total Return. You should be aware the performance presented does not
reflect contract charges or separate account charges which will reduce Portfolio
values which are available to contract owners and participants. Information
about separate account performance is available in the applicable contract
prospectus.
 
AVERAGE ANNUAL TOTAL RETURN
 
Average Annual Total Return quotations for periods of 1, 5, and 10 years, or,
since inception of a Portfolio, are calculated according to the following
formula:
 
                                       (n)
                               P(1 + T)   = ERV
 
          Where:
 
<TABLE>
            <S>  <C>
            P    = A hypothetical initial Purchase Payment of $1,000.
            T    = Average annual total return.
            n    = Number of years.
            ERV  = Ending redeemable value of a hypothetical $1,000 Purchase
                 Payment made at the beginning of the first period.
</TABLE>
 
Average Annual Total Return Portfolio reflects the deduction of expenses and
assumes that all dividends and distributions are reinvested when paid.
 
PORTFOLIO TOTAL RETURN
 
Portfolio Total Return quotations for periods of 1, 5, and 10 years, or, since
inception are calculated by adding to the Average Total Annual Return (described
above) the expenses of the Portfolio. Expenses of the Portfolio are calculated
at the end of each Portfolio's fiscal year and are expressed as a percentage of
average net assets. Expenses as a percentage of average net assets are prorated
equally over the months in the fiscal year in which the ratio was calculated
when determining expenses for periods crossing over fiscal years.
 
INDEX TOTAL RETURN
 
Index Total Return quotations for periods 1, 5, and 10 years, or, since
inception, are calculated
 
       Seven Day Effective Yield = [(Base Period Return + 1)(365/7) - 1]
 
                                       40
<PAGE>   76
 
SEVEN DAY YIELDS
 
The Money Market Portfolio may quote a Seven Day Current Yield and a Seven Day
Effective Yield. The Seven Day Current Yield is calculated by determining the
total return for the current seven day period ("base period return") an
annualizing the base period return by dividing by seven days, then multiplying
the result by 365 days. The Seven Day Effective Yield annualizes the base period
return while compounding weekly the base period return according to the
following formula:
 
       Seven Day Effective Yield = [(Base Period Return + 1)(365/7) - 1]
 
Average Total Return for the Periods Indicated
 
<TABLE>
<CAPTION>
                                                                12 Months
                                                                  Ended      Inception to
                         Portfolio                              12/31/98       12/31/98
                         ---------                              ---------    ------------
<S>                                                             <C>          <C>
EliteValue Portfolio                                               6.72%        17.86%
Emerging Growth Portfolio                                         37.43%        25.37%
Growth Equity Portfolio                                           21.60%        24.40%
Growth and Income Portfolio                                       14.16%        17.89%
International Equity Portfolio                                    (0.86)%        7.27%
Money Market Portfolio                                             5.23%         5.29%
U.S. Government Securities Portfolio                               7.49%         6.78%
</TABLE>
 
From time to time, the Adviser may reduce its compensation or assume expenses
with respect to the operations of a Portfolio in order to reduce the Portfolio's
expenses. Any such waiver or assumption would increase a Portfolio's yield and
total return during the period of the waiver or assumption.
 
                           SHAREHOLDER COMMUNICATIONS
 
Contract owners and participants are entitled to receive from the Company
unaudited semi-annual financial statements and audited year-end financial
statements certified by the Trust's independent public accountants. Each report
will show the investments owned by the Portfolios and the market value thereof
and will provide other information about the Portfolios and their operations.
 
                        ORGANIZATION AND CAPITALIZATION
 
The Trust is an open-end diversified management investment company, established
as a business trust under Massachusetts law by a Declaration of Trust dated
December 12, 1994, as amended (the "Declaration of Trust"). The Trust currently
offers shares of the Portfolios.
 
The Declaration of Trust authorizes the Trustees to create additional Portfolios
with different investment objectives from time to time. Any additional
Portfolios may be managed by investment advisers or investment sub-advisers
other than the current Adviser and Sub-advisers. The Trustees have the right,
subject to any necessary regulatory approvals, to create more than one class of
shares with respect to a Portfolio, where each class may be subject to different
charges and expenses and may have such other different rights as the Trustees
may prescribe. The Trustees also have the authority to terminate any Portfolio
of the Trust.
 
The Trust has authorized an unlimited number of shares of beneficial interest.
Shareholders are entitled to one vote per share, with fractional shares voting
proportionately. A separate vote will be taken by each Portfolio on matters
affecting that Portfolio. For example, a change in a fundamental investment
policy for the Growth and Income Portfolio would be voted upon only by
shareholders of that Portfolio. Approval of the Investment Advisory Agreement is
also a matter to be determined separately by each Portfolio. Shares have
noncumulative voting rights. Although the Trust is not required to hold annual
meetings of its shareholders, shareholders have the right to call a meeting to
elect or remove Trustees or to take other actions as provided in the Declaration
of Trust. Shares have no preemptive or subscription rights, and are
transferable. Shares are
 
                                       41
<PAGE>   77
 
entitled to dividends as declared by the Trustees. If a Portfolio is liquidated,
the shareholders of that Portfolio will receive either the net assets or the
proceeds of the net assets of that Portfolio.
 
                             SHAREHOLDER LIABILITY
 
Under Massachusetts law, shareholders could, under certain circumstances, be
held personally liable for the obligations of the Trust. However, the
Declaration of Trust disclaims shareholder liability for acts or obligations of
the Trust and requires that notice of such disclaimer be given in each
agreement, obligation, or instrument entered into or executed by the Trust or
the Trustees. The Declaration of Trust provides for indemnification out of a
Portfolio's property for all loss and expense of any shareholder held personally
liable for the obligations of a Portfolio. Thus the risk of a shareholder's
incurring financial loss on account of shareholder liability is limited to
circumstances in which the Portfolio would be unable to meet its obligations.
 
                               PORTFOLIO TURNOVER
 
The SEC defines portfolio turnover rate as the ratio of the lesser of annual
sales or purchases to the monthly average value of the portfolio, excluding from
both the numerator and the denominator securities with maturities at the time of
acquisition of one year or less. Under that definition, the Money Market
Portfolio does not calculate portfolio turnover. Portfolio turnover generally
involves expense to a Portfolio, including brokerage commissions or dealer
mark-ups and other transaction costs on the sale of securities and reinvestment.
 
The portfolio turnover rate of each Portfolio, other than the Money Market
Portfolio, for the periods ended December 31, 1997 and 1998 is set forth below.
 
<TABLE>
<CAPTION>
                     Portfolio                        1997        1998
                     ---------                        ----        ----
<S>                                                   <C>         <C>
EliteValue Portfolio................................   29%         39%
Emerging Growth Portfolio...........................  107%        107%
Growth Equity Portfolio.............................  111%        140%
Growth and Income Portfolio.........................  191%        151%
International Equity Portfolio......................    6%         61%
U.S. Government Securities Portfolio................  615%         24%
</TABLE>
 
A portfolio restructuring to reduce exposure in emerging markets caused the
International Equity Portfolio to have a significant variation in its portfolio
turnover rate, from 1997 to 1998. The portfolio turnover rate for the U.S.
Government Securities Portfolio also had significant variations between 1997 and
1998, caused by a change in the calculations method for dollar roll transactions
and a merger of another portfolio into the U.S. Government Securities Portfolio.
 
                                       42
<PAGE>   78
 
                                   CUSTODIAN
 
State Street Bank and Trust Company, 222 Franklin Street, Boston, Massachusetts
02110, is the Custodian of the Trust's assets. The Custodian's responsibilities
include safeguarding and controlling the Trust's cash and securities, handling
the receipt and delivery of securities, and collecting interest and dividends on
the Trust's investments.
 
The Custodian is responsible for holding all securities and cash of each
Portfolio, receiving and paying for securities purchased, delivering against
payment securities sold, receiving and collecting income from investments,
making all payments covering expenses of the Trust, and performing other
accounting and administrative duties, all as directed by persons authorized by
the Trust. The Custodian does not exercise any supervisory function in such
matters as the purchase and sale of portfolio securities, payment of dividends,
or payment of expenses of the Portfolios or the Trust. Portfolio securities of
the Portfolios purchased domestically are maintained in the custody of the
Custodian and may be entered into the book entry systems of securities
depositories approved by the Board of Trustees. Pursuant to the Trust's
agreement with the Custodian, portfolio securities purchased outside the United
States will be maintained in the custody of various foreign branches of the
Custodian and such other custodians, including foreign banks and foreign
securities depositories, as are approved by the Trustees, in accordance with
regulations under the 1940 Act.
 
The Custodian holds securities of the Portfolios on which call options have been
written and certain assets of the Portfolios constituting margin deposits with
respect to financial futures contracts at the disposal of the FCMs through which
such transactions are effected. The Portfolios may also be required to post
margin deposits with respect to covered call and put options written on stock
indices and for this purpose certain assets of those Portfolios may be held by
the Custodian pursuant to similar arrangements with the brokers involved. This
arrangement regarding margin deposits essentially consists of the Custodian
creating a separate segregated account into which it transfers (upon the Trust's
instructions) assets from a Portfolio's general (regular) custodial account.
 
In consideration for the services provided by the Custodian, the Trust pays the
Custodian an annual fee based upon the countries in which the Portfolios' assets
are maintained, plus transaction costs. The Trust also pays the Custodian a
monthly fee for the performance of certain currency accounting services in the
amount of $1,500 for each Portfolio with U.S. holdings only and $2,500 for each
global Portfolio.
 
                            INDEPENDENT ACCOUNTANTS
 
The Trust has selected Ernst & Young LLP, 200 Clarendon Street, Boston,
Massachusetts 02116, as the independent auditors to audit the annual financial
statements of the Trust.
 
                                       43
<PAGE>   79
 
                          DESCRIPTION OF NRSRO RATINGS
 
DESCRIPTION OF MOODY'S CORPORATE RATINGS
 
<TABLE>
        <S>  <C>  <C>
 
        Aaa  --   Bonds which are rated "Aaa" are judged to be of the best
                  quality. They carry the smallest degree of investment risk
                  and are generally referred to as "gilt-edge." Interest
                  payments are protected by a large or an exceptionally stable
                  margin and principal is secure. While the various protective
                  elements are likely to change, such changes as can be
                  visualized are most unlikely to impair the fundamentally
                  strong position of such issues.
 
        Aa   --   Bonds which are rated "Aa" are judged to be of high quality
                  by all standards. Together with the "Aaa" group, they
                  comprise what are generally known as high-grade bonds. They
                  are rated lower than the best bonds because margins of
                  protection may not be as large as in "Aaa" securities or
                  fluctuation of protective elements may be of greater
                  amplitude or there may be other elements present which make
                  the long-term risks appear somewhat larger than in "Aaa"
                  securities.
 
        A    --   Bonds which are rated "A" possess many favorable investment
                  attributes and are to be considered as upper medium-grade
                  obligations. Factors giving security to principal and
                  interest are considered adequate but elements may be present
                  which suggest a susceptibility to impairment sometime in the
                  future.
 
        Baa  --   Bonds which are rated "Baa" are considered as medium-grade
                  obligations (i.e., they are neither highly protected nor
                  poorly secured). Interest payments and principal security
                  appear adequate for the present, but certain protective
                  elements may be lacking or may be characteristically
                  unreliable over any great length of time. Such bonds lack
                  outstanding investment characteristics and, in fact, have
                  speculative characteristics as well.
 
        Ba   --   Bonds which are rated "Ba" are judged to have speculative
                  elements; their future cannot be considered as well assured.
                  Often the protection of interest and principal payments may
                  be very moderate and thereby not well-safeguarded during
                  both good and bad times over the future. Uncertainty of
                  position characterizes bonds in this class.
 
        B    --   Bonds which are rated "B" generally lack characteristics of
                  the desirable investment. Assurance of interest and
                  principal payments or of maintenance of other terms of the
                  contract over any long period of time may be small.
 
        Caa  --   Bonds which are rated "Caa" are of poor standing. Such
                  issues may be in default or there may be present elements of
                  danger with respect to principal or interest.
 
        Ca   --   Bonds which are rated "Ca" represent obligations which are
                  speculative in a high degree. Such issues are often in
                  default or have other marked shortcomings.
 
        C    --   Bonds which are rated "C" are the lowest-rated class of
                  bonds. Issues so rated can be regarded as having extremely
                  poor prospects of ever attaining any real investment
                  standing.
</TABLE>
 
DESCRIPTION OF S&P'S CORPORATE RATINGS
 
<TABLE>
        <S>  <C>  <C>
        AAA  --   Bonds rated "AAA" have the highest rating assigned by
                  Standard & Poor's to a debt obligation. Capacity to pay
                  interest and repay principal is extremely strong.
 
        AA   --   Bonds rated "AA" have a very strong capacity to pay interest
                  and repay principal and differ from the highest-rated issues
                  only in small degree.
</TABLE>
 
                                       44
<PAGE>   80
<TABLE>
        <S>  <C>  <C>
        A    --   Bonds rated "A" have a strong capacity to pay interest and
                  repay principal although they are somewhat more susceptible
                  to the adverse effects of changes in circumstances and
                  economic conditions than bonds in higher-rated categories.
 
        BBB  --   Bonds rated "BBB" are regarded as having an adequate
                  capacity to pay interest and repay principal. Whereas they
                  normally exhibit adequate protection parameters, adverse
                  economic conditions or changing circumstances are more
                  likely to lead to a weakened capacity to pay interest and
                  repay principal for bonds in this category than for bonds in
                  higher-rated categories.
 
        BB, B, CCC, CC and C --
                  Bonds rated in these categories are regarded, on balance, as
                  predominantly speculative with respect to the issuer's
                  capacity to pay interest and repay principal in accordance
                  with the terms of the obligation. "BB" indicates the least
                  degree of speculation and "C" the highest degree of
                  speculation. While such debt will likely have some quality
                  and protective characteristics, these are outweighed by
                  large uncertainties or major risk exposures to adverse
                  conditions. A rating of "C" is typically applied to debt
                  subordinated to senior debt which is assigned an actual or
                  implied "CCC" rating. It may also be used to cover a
                  situation where a bankruptcy petition has been filed, but
                  debt service payments are continued.
</TABLE>
 
DESCRIPTION OF DUFF CORPORATE RATINGS
 
<TABLE>
        <S>  <C>  <C>
        AAA  --   Highest credit quality. The risk factors are negligible,
                  being only slightly more than for risk-free U.S. Treasury
                  debt.
 
        AA   --   Risk is modest but may vary slightly from time to time
                  because of economic conditions.
 
        A    --   Protection factors are average but adequate. However, risk
                  factors are more variable and greater in periods of economic
                  stress.
 
        BBB  --   Investment-grade. Considerable variability in risk during
                  economic cycles.
 
        BB   --   Below investment-grade but deemed likely to meet obligations
                  when due. Present or prospective financial protection
                  factors fluctuate according to industry conditions or
                  company fortunes. Overall quality may move up or down
                  frequently within this category.
 
        B    --   Below investment-grade and possessing risk that obligations
                  will not be met when due. Financial protection factors will
                  fluctuate widely according to economic cycles, industry
                  conditions, and/or company fortunes. Potential exists for
                  frequent changes in quality rating within this category or
                  into a higher- or lower-quality rating grade.
 
        Substantial Risk --
                  Well below investment-grade securities. May be in default or
                  have considerable uncertainty as to timely payment of
                  interest, preferred dividends, and/or principal. Protection
                  factors are narrow and risk can be substantial with
                  unfavorable economic/industry conditions, and/or with
                  favorable company developments.
</TABLE>
 
DESCRIPTION OF FITCH CORPORATE RATINGS
 
<TABLE>
        <S>  <C>  <C>
        AAA  --   Bonds considered to be investment-grade and of the highest
                  credit quality. The obligor has an exceptionally strong
                  ability to pay interest and repay principal, which is
                  unlikely to be affected by reasonably foreseeable events.
</TABLE>
 
                                       45
<PAGE>   81
<TABLE>
        <S>  <C>  <C>
        AA   --   Bonds considered to be investment-grade and of very high
                  credit quality. The obligor's ability to pay interest and
                  repay principal is very strong, although not quite as strong
                  as bonds rated "AAA." Because bonds rated in the "AAA" and
                  "AA" categories are not significantly vulnerable to
                  foreseeable future developments, short-term debt of these
                  issues is generally rated "[-]+."
 
        A    --   Bonds considered to be investment-grade and of high credit
                  quality. The obligor's ability to pay interest and to repay
                  principal is considered to be strong, but may be more
                  vulnerable to adverse changes in economic conditions and
                  circumstances than bonds with higher ratings.
 
        BBB  --   Bonds considered to be investment-grade and of satisfactory
                  credit quality. The obligor's ability to pay interest and
                  repay principal is considered to be adequate. Adverse
                  changes in economic conditions and circumstances, however,
                  are more likely to have an adverse effect on these bonds,
                  and, therefore, impair timely payment. The likelihood that
                  the ratings of these bonds will fall below investment-grade
                  is higher than for bonds with higher ratings.
 
        BB   --   Bonds considered speculative and of low investment grade.
                  The obligor's ability to pay interest and repay principal is
                  not strong and is considered likely to be affected over time
                  by adverse economic changes.
 
        B    --   Bonds considered highly speculative. Bonds in this class are
                  lightly protected as to the obligor's ability to pay
                  interest over the life of the issue and repay principal when
                  due.
 
        CCC  --   Bonds which may have certain identifiable characteristics
                  which, if not remedied, could lead to the possibility of
                  default in either principal or interest payments.
 
        CC   --   Bonds which are minimally protected. Default in payment of
                  interest and/or principal seems probable.
 
        C    --   Bonds which are in imminent default in payment of interest
                  or principal.
</TABLE>
 
DESCRIPTION OF THOMSON BANKWATCH, INC. CORPORATE RATINGS
 
<TABLE>
        <S>  <C>  <C>
        AAA  --   Long-term, fixed income securities that are rated "AAA"
                  indicate that the ability to repay principal and interest on
                  a timely basis is very high.
 
        AA   --   Long-term, fixed income securities that are rated "AA"
                  indicate a superior ability to repay principal and interest
                  on a timely basis with limited incremental risk vs. issues
                  rated in the highest category.
</TABLE>
 
TBW may apply plus ("+") and minus ("-") modifiers in the "AAA" and "AA"
categories to indicate where within the respective category the issued security
is placed.
 
DESCRIPTION OF IBCA LIMITED AND IBCA INC. CORPORATE RATINGS
 
<TABLE>
        <S>  <C>  <C>
        AAA  --   Obligations which are rated "AAA" are considered to be of
                  the lowest expectation of investment risk. Capacity for
                  timely repayment of principal and interest is substantial
                  such that adverse changes in business, economic, or
                  financial conditions are unlikely to increase investment
                  risk significantly.
</TABLE>
 
                                       46
<PAGE>   82
<TABLE>
        <S>  <C>  <C>
        AA   --   Obligations which are rated "AA" are considered to be of a
                  very low expectation of investment risk. Capacity for timely
                  repayment of principal and interest is substantial. Adverse
                  changes in business, economic, or financial conditions may
                  increase investment risk, albeit not very significantly.
</TABLE>
 
DESCRIPTION OF S&P'S COMMERCIAL PAPER RATINGS
 
<TABLE>
        <S>  <C>  <C>
        A-1  --   Degree of safety regarding timely payments is either
                  overwhelming or very strong.
 
        A-1+ --   Those issues determined to possess overwhelming safety
                  characteristics are denoted "A-1+."
 
        A-2  --   Capacity for timely payment is strong, but the relative
                  degree of safety is not as high as for issues designated
                  "A-1."
 
        A-3  --   Adequate capacity for timely payment. Issues with this
                  designation, however, are more vulnerable to the adverse
                  effects of changes in circumstances than obligations
                  carrying the higher designations.
 
        B    --   Regarded as having only speculative capacity for timely
                  payment.
 
        C    --   Have a doubtful capacity for payment.
 
        D    --   In payment default. The "D" rating category is used when
                  interest payments or principal payments are not made on the
                  due date, even if the applicable grace period has not
                  expired, unless Standard & Poor's believes that such
                  payments will be made during such grace period.
</TABLE>
 
DESCRIPTION OF MOODY'S COMMERCIAL PAPER RATINGS
 
<TABLE>
<S>            <C>
 
Prime-1        Highest commercial paper rating assigned by Moody's. Issuers
               rated "Prime-1" (or related supporting institutions) are
               considered to have a superior capacity for repayment of
               short-term promissory obligations.
 
Prime-2        These issuers (or related supporting institutions) are
               considered to have a strong capacity for repayment of
               short-term promissory obligations. This will normally be
               evidenced by many of the characteristics of issuers rated
               "Prime-1" but to a lesser degree. Earnings trend and
               coverage ratios, while sound, will be more subject to
               variation. Capitalization characteristics, while still
               appropriate, may be more affected by external conditions.
               Ample alternative liquidity is maintained.
 
Prime-3        Have an acceptable capacity for repayment of short-term
               promissory obligations. The effect of industry
               characteristics and market composition may be more
               pronounced. Variability in earnings and profitability may
               result in changes in the level of debt protection
               measurements and the requirement for relatively high
               financial leverage. Adequate alternate liquidity is
               maintained.
 
Not Prime      These issuers do not fall within any of the Prime rating
Issuers        categories.
</TABLE>
 
                                       47
<PAGE>   83
 
DESCRIPTION OF DUFF COMMERCIAL PAPER RATINGS
 
<TABLE>
<S>            <C>
Duff-1         Highest commercial paper rating assigned by Duff & Phelps.
               Paper rated "Duff-1" is regarded as having very high
               certainty of timely payment with excellent liquidity factors
               which are supported by ample asset protection. Risk factors
               are minor.
 
Duff-2         Regarded as having good certainty of timely payment, good
               access to capital markets, and sound liquidity factors and
               company fundamentals. Risk factors are small.
</TABLE>
 
DESCRIPTION OF FITCH COMMERCIAL PAPER RATINGS
 
<TABLE>
<S>            <C>
Fitch-1        (Highest Grade) is the highest commercial paper rating
               assigned by Fitch. Paper rated "Fitch-1" is regarded as
               having the strongest degree of assurance for timely payment.
 
Fitch-2        (Very Good Grade) is the second highest commercial paper
               rating assigned by Fitch which reflects an assurance of
               timely payment only slightly less in degree than the
               strongest issues.
</TABLE>
 
DESCRIPTION OF IBCA LIMITED AND IBCA INC. COMMERCIAL PAPER RATINGS
 
<TABLE>
<S>       <C>  <C>
 
A1        --   Short-term obligations rated "A1" are supported by a very
               strong capacity for timely repayment. A plus ("+") sign is
               added to those issues determined to possess the highest
               capacity for timely payment.
 
A2        --   Short-term obligations rated "A2" are supported by a strong
               capacity for timely repayment, although such capacity may be
               susceptible to adverse changes in business, economic, or
               financial conditions.
</TABLE>
 
DESCRIPTION OF THOMSON BANKWATCH, INC. COMMERCIAL PAPER RATINGS
 
<TABLE>
<S>    <C>  <C>
TBW-1  --   Short-term obligations rated "TBW-1" indicate a very high
            degree of likelihood that principal and interest will be
            paid on a timely basis.
 
TBW-2  --   Short-term obligations rated "TBW-2" indicate that, while
            the degree of safety regarding timely payment of principal
            and interest is strong, the relative degree of safety is not
            as high as for issues rated "TBW-1."
</TABLE>
 
                              FINANCIAL STATEMENTS
 
The Trust's financial statements are included herein.
 
                                       48
<PAGE>   84
 
                                AGA SERIES TRUST
 
                                 ANNUAL REPORT
 
                               DECEMBER 31, 1998
 
The information in this report is intended for informational purposes. This
report is not authorized for distribution to prospective investors unless
preceded or accompanied by current prospectuses for AGA Series Trust and AGA
Separate Account A. The prospectuses contain important information about
American General Annuity Insurance Company and AGA Separate Account A. Please
read the prospectuses carefully before investing.
<PAGE>   85
 
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
 
     The following discussion of the 1998 performance of the Portfolios within
AGA Series Trust supplements the financial statements and related notes found
elsewhere in this report.
 
     The total returns reported are net of portfolio operating expenses but do
not reflect any insurance or administrative charges that apply to the separate
account. Furthermore, the portfolios' performances reflect the absorption of
certain fund expenses by American General Annuity Insurance Company. Had these
expenses not been absorbed, the total returns would have been lower. Performance
data represent past performance and neither guarantee nor predict future
results. The investment return and accumulation value of the portfolios will
fluctuate, and the redemption value may be higher or lower than an investor's
original cost.
 
     As with all money market funds, an investment in the State Street Global
Advisors Money Market Portfolio is neither insured nor guaranteed by the U.S.
Government. Although the Portfolio strives to maintain a stable net asset value
of $1.00 per share, there can be no assurance that this objective will be met.
 
CREDIT SUISSE GROWTH AND INCOME PORTFOLIO
(formerly BEA Growth & Income Portfolio)
 
     The total return for 1998 was 14.2%, lagging the 28.6% and 8.7% of its
benchmarks, the Standard and Poor's 500 Stock Index ("S&P 500 Index") and Lehman
Aggregate Bond Index ("Lehman Aggregate"), respectively.
 
     Nineteen ninety-eight was a difficult year for active equity managers who
seek to maintain broadly diversified portfolios because the performances of a
few of the largest stocks in the S&P 500 Index were responsible for a
disproportionate share of the overall market's gain. Notwithstanding that
large-cap bias, the manager continued to concentrate holdings in mid-cap
companies because he believes, based on long experience, that maintaining a
diversified portfolio of mid-cap equities will provide better returns in the
long run. Furthermore, the Portfolio suffered during the year because it was
underweight in two of the market's strongest sectors, technology (especially
Internet-related) and financial stocks.
 
     The strategy in the equity portion of the Portfolio involves top-down
sector selection combined with bottom-up stock selection within sectors. The
manager believes that three factors drove the bull market in 1998: increased
corporate earnings, rising dividends, and improved P/E ratios. He does not
believe that these factors can continue to produce favorable results, so he
became more cautious in his stock selection and at mid year commenced changing
the portfolio mix from 55% equities/45% debt securities to 45% equities/40%
debt/15% cash at year end. The manager held the relatively-large cash position
because he was wary of both the debt and equity markets.
 
     On the fixed-income side, 1998 was a very difficult year. Driven by
financial instability in many of the world's markets, investors engaged in
several classic "flight to quality" rallies that favored only the safest
securities. As a result, yield spread was far wider than normal during most of
the year, and U.S. Treasuries -- considered the world standard of
creditworthiness -- significantly outperformed all other debt sectors. During
the year, the fixed income manager maintained a slightly long average maturity
and an overweight in mortgage holdings in an effort to attain yield. That
overweight (and corresponding underweight in Treasuries) caused the fixed income
portion of the Portfolio to slightly underperform the Lehman Aggregate.
 
CREDIT SUISSE INTERNATIONAL EQUITY PORTFOLIO
 
     In 1998 the International Equity Portfolio's total return was a negative
0.9%, significantly worse than the 20.0% return of its benchmark, the Morgan
Stanley Composite Index -- Europe, Australia & Far East (EAFE).
 
     The poor performance has offset earlier superior performance, so that the
Portfolio's inception-to-date return of 7.3% now lags the EAFE benchmark's
10.8%. The manager attributes the current disappointing performance to the same
factors that produced the earlier success; i.e., overweight investment in
emerging
 
                                        1
<PAGE>   86
 
markets, principally Eastern and Central Europe. The performance during the year
was driven by the Portfolio's overweight position in the poor-performing
emerging markets (outside of Asia -- the manager anticipated the problems there
and was largely out of that market before the crash). The problem was compounded
by the corresponding underweight in core Europe, the strongest of the world's
markets. The manager erred early in the year when he concluded that Asia's
problems would not depress emerging markets elsewhere. He stuck to his basic
strategy of overweighting investment in emerging markets because he believed
that is where his expertise added the most value. Although the individual stocks
owned did well within their respective markets, the flight of capital out of
emerging markets everywhere was disastrous for the Portfolio. In short, the
manager severely underestimated the systematic risk of straying so far from the
EAFE weightings.
 
     In order to deal with the problems, in the second half of the year the
Portfolio was conservatively restructured with weightings that are much closer
to the EAFE. The emerging market exposure was reduced to less than 10% of the
Portfolio, the Western European exposure was increased and the exposure in Japan
was increased slightly. At year end the Portfolio was overweight in Western
Europe but was still underweight in Japan (although by a smaller margin than
earlier in the year). The manager is not optimistic about Japan, but believes it
dangerous to be so far off the benchmark because he expects the market to move
up very rapidly when it does turn. The manager intends to stick much closer to
the EAFE weightings in the future, and so expects future performance to more
closely parallel the benchmark.
 
ELITEVALUE PORTFOLIO
(formerly EliteValue Asset Allocation Portfolio)
 
     Although the EliteValue Portfolio objectives and policies permit the
manager to invest in all asset categories, the manager has consistently kept it
almost entirely invested in equities, a strategy that has generally proved very
successful. The Portfolio consists of a relatively small number of stocks of
companies the manager believes will show superior performance, and the turnover
rate is very low. The manager continues to invest in a limited number of
businesses that he feels are inherently worth more than their asking prices and
that will generate excess cash flow that will enhance long-term value for the
shareholders; i.e., the focus is on individual companies prospective long-term
potential rather than on stock market fluctuations.
 
     The Portfolio's 1998 total return of 6.7% fell short of its benchmarks, the
S&P 500 Index and the Lipper Flexible Portfolio Funds Index, which registered
28.6% and 16.5%, respectively. However, the inception-to-date return of 17.9%
remained slightly above the marks. Performance suffered because the manager's
value style of investing was generally out of favor in 1998. Additionally, the
performance was hurt by weakness in stocks of companies doing business in
international markets, and by the fact that the Portfolio's stock selection
process lead the manager away from the technology and electric utility sectors,
two of the strongest performing sectors in 1998.
 
     Among the Portfolio's largest holdings, McDonalds and Freddie Mac had great
success. Major disappointments were Du Pont, Wells Fargo, and Boeing. Boeing
continued to have difficulty dealing with its problems, but the manager believed
that in the long run a well-managed Boeing would be a very strong performer and
good investment. The manager sold Lockheed Martin, Tennoco and Monsanto and
bought ITT, Excel, and Phillip Morris.
 
     The manager is disappointed in his current performance. Nevertheless, he
still strives to attain his goal of a 12-15% return in the long run. He
continues to hold a substantial cash position, as he is still wary of the market
and hasn't found new names that he feels warrant heavy investment.
 
SALOMON U.S. GOVERNMENT SECURITIES PORTFOLIO
 
     The 1998 total return was 7.5%, lagging its benchmark, One-to-Ten Year
Treasury Index by 1.0%. As noted above, 1998 was a very volatile year in
fixed-income markets. The financial instability in many of the world's markets
caused investors to seek only the safest securities. As a result, the total
return on U.S. Treasuries -- considered the world standard of
creditworthiness -- significantly outperformed all other debt sectors.
                                        2
<PAGE>   87
 
     It is generally difficult for a government bond portfolio to significantly
outperform its index, so the manager maintained a slightly long maturity and an
overweight position in mortgage securities in order to capture yield. It was
that overweight (and corresponding underweight in Treasuries) that caused the
Portfolio to underperform its benchmark.
 
     On January 6, 1999, Salomon Brothers Asset Management, Inc. notified the
Adviser of the termination of its Sub-Advisory relationship as of March 8, 1999.
 
STATE STREET GLOBAL ADVISORS GROWTH EQUITY PORTFOLIO
(formerly Global Advisors Growth Equity Portfolio)
 
     The Growth Equity Portfolio's 1998 return of 21.6% lagged the 28.6% of its
benchmark, the S&P 500 Index. The Portfolio is an enhanced index fund, that is,
one that tracks the S&P 500 Index by industry classification, but attempts to
pick the best individual stocks within each industry.
 
     Performance suffered in 1998 from the fact that most of the positive
benchmark performance resulted from strong performances by the very largest
"mega-cap" stocks. The mid-cap sector, where most of the Portfolio's assets are
concentrated, was left behind. Additionally, because of the Portfolio's small
size, it held a relatively large cash position, a factor that hampered
performance in a year of rising stock prices.
 
     State Street Global Advisors continues to try to improve performance by
enhancing its computer model. Specifically, it has revised its industry
classifications, and is now linking industries that show similar characteristics
into 24 "clusters." It has also refined its method of following "lead analysts"
for individual stocks and for entire industries. The management team believes
that the modeling process must be constantly enhanced in order to stay ahead of
the competition. That is, if all players in the market have the same analytical
capacity, nobody can have an advantage.
 
STATE STREET GLOBAL ADVISORS MONEY MARKET PORTFOLIO
(formerly Global Advisors Money Market Portfolio)
 
     The Money Market Portfolio's total return of 5.2% for 1998 exceeded its
benchmark, the 91-day Treasury Auction Average Index, as it has generally done
in recent periods. The Portfolio's small size and volatility (most purchases
initially pass thorough the Portfolio during the "policy free look" period) make
it difficult for the manager to make economic trades while maintaining
sufficient diversity and liquidity.
 
VAN KAMPEN EMERGING GROWTH PORTFOLIO
(formerly Van Kampen American Capital Emerging Growth Portfolio)
 
     Capped off by its manager's "best quarter ever" in the fourth quarter, the
Emerging Growth Portfolio's 1998 return of 37.4% more than doubled the Russell
Mid-Cap Growth's 17.9% and nearly tripled the Lipper Mid-Cap Fund's 13.9%.
 
     During 1998 the performance was boosted by a heavy overweight position in
the technology sector. Technologies comprised 40% of total assets at year end.
Within that sector, Internet stocks such as AOL and Yahoo were particular
successes. Additionally, heavy positions in "Internet infrastructure" names,
such as Cisco and Network Solutions, also contributed favorably. During the year
the manager increased (already-overweight) holdings in the strong health care
and biotech sectors and bought selectively in electronic and specialty
retailing. Holding nothing in the poor-performing energy sector also proved to
be beneficial.
 
     The Portfolio continues to be structured in a defensive position, and the
manager attributes a large part of his outperformance to the fact that the
Portfolio has avoided any disasters. He believes that his long-term strategy of
staying fully invested in stocks with positive fundamentals continues to be the
right strategy. He still expects that a "snap back" in the valuations of small
and mid-cap issues relative to the very large-cap issues that have led the
market in recent quarters will ultimately benefit future performance.
 
                                        3
<PAGE>   88
 
PERFORMANCE GRAPHS
 
     The following graphs illustrate the performance of $10,000 invested in each
of the portfolios in comparison to their respective benchmark returns. The
charts assume investment at each portfolio's inception date and track
performance though December 31, 1998.
 
                                        4
<PAGE>   89
 
                                    [GRAPH]
 
<TABLE>
<CAPTION>
              AVERAGE ANNUAL TOTAL RETURN*
  ----------------------------------------------------
                                      ONE      SINCE
                                     YEAR    INCEPTION
  ----------------------------------------------------
  <S>                                <C>     <C>
  Growth and Income Portfolio        14.16     17.89
  S&P 500 Index                      28.58     29.03
  Lehman Aggregate                    8.69      7.86
  S&P 500/Lehman                     18.63     18.45
</TABLE>
 
<TABLE>
<CAPTION>
             DECEMBER 31, 1998 FUND FACTS
  --------------------------------------------------
  <S>                               <C>
  Date of Inception                     10/20/95
  Net Assets ($000)                     $16,713
  Net Asset Value per Share             $ 13.89
  Manager                            Credit Suisse
                                    Asset Management
</TABLE>
 
* The portfolio total returns reported are net of portfolio operating expenses
  but do not reflect any insurance or administrative charges that apply to the
  separate account. Furthermore, the portfolio's performance reflects the
  absorption of certain fund expenses by American General Annuity Insurance
  Company. Had these expenses not been absorbed, the total returns would have
  been lower. Performance data represent past performance and neither guarantee
  nor predict future results. The investment return and accumulation value of
  the portfolios will fluctuate, and the redemption value may be higher or lower
  than an investor's original cost. Neither the S&P 500 Index nor the Lehman
  Aggregate, nor its composite include any expenses.
 
                                        5
<PAGE>   90
 
                                    [GRAPH]
 
<TABLE>
<CAPTION>
              AVERAGE ANNUAL TOTAL RETURN*
  ----------------------------------------------------
                                      ONE      SINCE
                                     YEAR    INCEPTION
  ----------------------------------------------------
  <S>                                <C>     <C>
  International Equity Portfolio     (0.86)     7.27
  Morgan Stanley -- EAFE             20.00     10.82
</TABLE>
 
<TABLE>
<CAPTION>
              DECEMBER 31, 1998 FUND FACTS
  -----------------------------------------------------
  <S>                               <C>
  Date of Inception                      10/20/95
  Net Assets ($000)                       $5,996
  Net Asset Value per Share               $10.23
  Manager                           Credit Suisse Asset
                                     Management, Ltd.
</TABLE>
 
* The portfolio total returns reported are net of portfolio operating expenses
  but do not reflect any insurance or administrative charges that apply to the
  separate account. Furthermore, the portfolio's performance reflects the
  absorption of certain fund expenses by American General Annuity Insurance
  Company. Had these expenses not been absorbed, the total returns would have
  been lower. Performance data represent past performance and neither guarantee
  nor predict future results. The investment return and accumulation value of
  the portfolios will fluctuate, and the redemption value may be higher or lower
  than an investor's original cost. The Morgan Stanley Composite Index -- EAFE
  does not include any expenses.
 
                                        6
<PAGE>   91
 
                                    [GRAPH]
 
<TABLE>
<CAPTION>
              AVERAGE ANNUAL TOTAL RETURN*
  ----------------------------------------------------
                                      ONE      SINCE
                                     YEAR    INCEPTION
  ----------------------------------------------------
  <S>                                <C>     <C>
  EliteValue Portfolio                6.72     17.86
  S&P 500 Index                      28.58     16.27
  Lipper Flex                        16.52     16.27
</TABLE>
 
<TABLE>
<CAPTION>
             DECEMBER 31, 1998 FUND FACTS
  ---------------------------------------------------
  <S>                                  <C>
  Date of Inception                        1/2/96
  Net Assets                              $20,620
  Net Asset Value per Share               $ 14.95
  Manager                              OpCap Advisors
</TABLE>
 
* The portfolio total returns reported are net of portfolio operating expenses
  but do not reflect any insurance or administrative charges that apply to the
  separate account. Furthermore, the portfolio's performance reflects the
  absorption of certain fund expenses by American General Annuity Insurance
  Company. Had these expenses not been absorbed, the total returns would have
  been lower. Performance data represent past performance and neither guarantee
  nor predict future results. The investment return and accumulation value of
  the portfolios will fluctuate, and the redemption value may be higher or lower
  than an investor's original cost. The S&P 500 Index does not include any fund
  expenses.
 
                                        7
<PAGE>   92
 
                                    [GRAPH]
 
<TABLE>
<CAPTION>
              AVERAGE ANNUAL TOTAL RETURN*
  ----------------------------------------------------
                                      ONE      SINCE
                                      YEAR   INCEPTION
  ----------------------------------------------------
  <S>                                 <C>    <C>
  U.S. Government Securities          7.49     6.79
    Portfolio
  Treasury 1 to 10 Yr. Index          8.49     7.38
</TABLE>
 
<TABLE>
<CAPTION>
              DECEMBER 31, 1998 FUND FACTS
  ----------------------------------------------------
  <S>                           <C>
  Date of Inception                     2/6/96
  Net Assets                            $8,679
  Net Asset Value per Share             $10.23
  Manager                          Salomon Brothers
                                Asset Management, Inc.
</TABLE>
 
* The portfolio total returns reported are net of portfolio operating expenses
  but do not reflect any insurance or administrative charges that apply to the
  separate account. Furthermore, the portfolio's performance reflects the
  absorption of certain fund expenses by American General Annuity Insurance
  Company. Had these expenses not been absorbed, the total returns would have
  been lower. Performance data represent past performance and neither guarantee
  nor predict future results. The investment return and accumulation value of
  the portfolios will fluctuate, and the redemption value may be higher or lower
  than an investor's original cost. The Treasury 1-to-10 Year Index does not
  include any fund expenses.
 
                                        8
<PAGE>   93
 
                                    [GRAPH]
 
<TABLE>
<CAPTION>
              AVERAGE ANNUAL TOTAL RETURN*
  ----------------------------------------------------
                                      ONE      SINCE
                                     YEAR    INCEPTION
  ----------------------------------------------------
  <S>                                <C>     <C>
  Growth Equity Portfolio            21.60     24.74
  S&P 500 Index                      28.58     28.33
</TABLE>
 
<TABLE>
<CAPTION>
              DECEMBER 31, 1998 FUND FACTS
  ----------------------------------------------------
  <S>                                  <C>
  Date of Inception                       10/20/95
  Net Assets                               $15,500
  Net Asset Value per Share                $ 16.57
  Manager                               State Street
                                       Global Advisors
</TABLE>
 
* The portfolio total returns reported are net of portfolio operating expenses
  but do not reflect any insurance or administrative charges that apply to the
  separate account. Furthermore, the portfolio's performance reflects the
  absorption of certain fund expenses by American General Annuity Insurance
  Company. Had these expenses not been absorbed, the total returns would have
  been lower. Performance data represent past performance and neither guarantee
  nor predict future results. The investment return and accumulation value of
  the portfolios will fluctuate, and the redemption value may be higher or lower
  than an investor's original cost. The S&P 500 Stock Index does not include any
  fund expenses.
 
                                        9
<PAGE>   94
 
                                    [GRAPH]
 
<TABLE>
<CAPTION>
              AVERAGE ANNUAL TOTAL RETURN*
  ----------------------------------------------------
                                      ONE      SINCE
                                      YEAR   INCEPTION
  ----------------------------------------------------
  <S>                                 <C>    <C>
  Money Market Portfolio              5.23     5.30
  91-day Treasury Index               4.88     5.09
</TABLE>
 
<TABLE>
<CAPTION>
              DECEMBER 31, 1998 FUND FACTS
  ----------------------------------------------------
  <S>                                  <C>
  Date of Inception                       10/10/95
  Net Assets                               $9,254
  Net Asset Value per Share                $ 1.00
  Manager                               State Street
                                       Global Advisors
</TABLE>
 
* The portfolio total returns reported are net of portfolio operating expenses
  but do not reflect any insurance or administrative charges that apply to the
  separate account. Furthermore, the portfolio's performance reflects the
  absorption of certain fund expenses by American General Annuity Insurance
  Company. Had these expenses not been absorbed, the total returns would have
  been lower. Performance data represent past performance and neither guarantee
  nor predict future results. The investment return and accumulation value of
  the portfolios will fluctuate, and the redemption value may be higher or lower
  than an investor's original cost. The 91-day Treasury Index does not include
  any expenses.
 
  As with all money market funds, an investment in the Global Advisors The Money
  Market Portfolio is neither insured nor guaranteed by the U.S. Government.
  Although the Portfolio strives to maintain a stable net asset value of $1.00
  per share, there can be no assurance that this objective will be met.
 
                                       10
<PAGE>   95
 
                                    [GRAPH]
 
<TABLE>
<CAPTION>
              AVERAGE ANNUAL TOTAL RETURN*
  ----------------------------------------------------
                                      ONE      SINCE
                                     YEAR    INCEPTION
  ----------------------------------------------------
  <S>                                <C>     <C>
  Emerging Growth Portfolio          37.43     25.38
  Russell Mid Cap Growth             17.86     19.81
  Lipper Mid Cap                     13.92     16.49
</TABLE>
 
<TABLE>
<CAPTION>
              DECEMBER 31, 1998 FUND FACTS
  ----------------------------------------------------
  <S>                           <C>
  Date of Inception                     1/2/96
  Net Assets                           $11,674
  Net Asset Value per Share            $ 19.05
  Manager                             Van Kampen
                                Asset Management Inc.
</TABLE>
 
* The portfolio total returns reported are net of portfolio operating expenses
  but do not reflect any insurance or administrative charges that apply to the
  separate account. Furthermore, the portfolio's performance reflects the
  absorption of certain fund expenses by American General Annuity Insurance
  Company. Had these expenses not been absorbed, the total returns would have
  been lower. Performance data represent past performance and neither guarantee
  nor predict future results. The investment return and accumulation value of
  the portfolios will fluctuate, and the redemption value may be higher or lower
  than an investor's original cost. The Russell Mid Cap Growth does not include
  any expenses.
 
                                       11
<PAGE>   96
 
                                AGA SERIES TRUST
 
                              FINANCIAL SCHEDULES
 
                               DECEMBER 31, 1998
<PAGE>   97
 
                                AGA SERIES TRUST
                    CREDIT SUISSE GROWTH & INCOME PORTFOLIO
 
                            SCHEDULE OF INVESTMENTS
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                            SHARES        VALUE
- --------------------                                          ----------   -----------
<S>                                                           <C>          <C>
COMMON STOCKS -- 45.7%
  AIR TRAVEL -- 0.9%
     AMR Corporation(a).....................................       2,500   $   148,438
                                                                           -----------
  BROADCASTING -- 2.8%
     Fox Entertainment Group Incorporated(a)................      10,000       251,875
     MediaOne Group Incorporated............................       4,500       211,500
                                                                           -----------
                                                                               463,375
                                                                           -----------
  BUSINESS SERVICES -- 1.7%
     Automatic Data Processing Incorporated.................       3,500       280,656
                                                                           -----------
  CHEMICALS -- 3.1%
     Monsanto Company.......................................       6,000       285,000
     Scotts Company(a)......................................       6,000       230,625
                                                                           -----------
                                                                               515,625
                                                                           -----------
  COMMUNICATION SERVICES -- 1.3%
     AirTouch Communications Incorporated(a)................       3,000       216,375
                                                                           -----------
  COMPUTERS & BUSINESS EQUIPMENT -- 3.7%
     DST Systems Incorporated(a)............................       2,000       114,125
     Sun Microsystems Incorporated(a).......................       3,000       256,875
     Symbol Technologies Incorporated.......................       4,000       255,750
                                                                           -----------
                                                                               626,750
                                                                           -----------
  CONTAINERS & GLASS -- 1.1%
     Owens Illinois Incorporated(a).........................       6,000       183,750
                                                                           -----------
  DRUGS & HEALTH CARE -- 3.3%
     Pharmacia & Upjohn Incorporated........................       3,000       169,875
     SmithKline Beecham PLC ADR.............................       3,000       208,500
     Warner-Lambert Company.................................       2,400       180,450
                                                                           -----------
                                                                               558,825
                                                                           -----------
  ELECTRIC UTILITIES -- 1.2%
     Public Service Enterprise Group........................       5,000       200,000
                                                                           -----------
  ELECTRICAL EQUIPMENT -- 1.1%
     Emerson Electric Company...............................       3,000       181,500
                                                                           -----------
  FINANCE & BANKING -- 0.1%
     Citigroup Incorporated.................................         250        13,250
                                                                           -----------
  FOOD & BEVERAGES -- 2.8%
     Hershey Foods Corporation..............................       2,500       155,469
     Sysco Corporation......................................       5,000       137,187
     Wrigley (WM) Jr. Company...............................       2,000       179,125
                                                                           -----------
                                                                               471,781
                                                                           -----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                       F-2
<PAGE>   98
                                AGA SERIES TRUST
                    CREDIT SUISSE GROWTH & INCOME PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                            SHARES        VALUE
- --------------------                                          ----------   -----------
<S>                                                           <C>          <C>
COMMON STOCKS -- (CONTINUED)
  INDUSTRIAL MACHINERY -- 1.8%
     Tyco International Limited.............................       4,000   $   301,750
                                                                           -----------
  INSURANCE -- 2.4%
     American International Group Incorporated..............       2,500       241,563
     CNA Financial Corporation(a)...........................       4,000       161,000
                                                                           -----------
                                                                               402,563
                                                                           -----------
  INTERNATIONAL OIL -- 1.3%
     Exxon Corporation......................................       3,000       219,375
                                                                           -----------
  MANUFACTURING -- 2.0%
     General Electric Company...............................       1,600       163,300
     Illinois Tool Works Incorporated.......................       3,000       174,000
                                                                           -----------
                                                                               337,300
                                                                           -----------
  MULTIMEDIA -- 2.5%
     Media General Incorporated.............................       4,000       212,000
     Time Warner Incorporated...............................       3,400       211,012
                                                                           -----------
                                                                               423,012
                                                                           -----------
  PUBLISHING -- 0.7%
     Hollinger International Incorporated...................       8,000       111,500
                                                                           -----------
  REAL ESTATE -- 0.4%
     TriNet Corporate Realty Trust Incorporated.............       2,500        66,875
                                                                           -----------
  RETAIL TRADE -- 1.2%
     Costco Companies Incorporated(a).......................       2,800       202,125
                                                                           -----------
  SOFTWARE -- 2.1%
     Microsoft Corporation(a)...............................       2,500       346,719
                                                                           -----------
  TELECOMMUNICATIONS -- 6.1%
     AT&T Corporation.......................................       6,000       451,500
     COMSAT Corporation.....................................       5,000       180,000
     MCI WorldCom Incorporated(a)...........................       3,000       215,250
     Teligent Incorporated(a)...............................       6,000       172,500
                                                                           -----------
                                                                             1,019,250
                                                                           -----------
  TRANSPORTATION -- 2.1%
     FDX Corporation(a).....................................       2,500       222,500
     Norfolk Southern Corporation...........................       4,000       126,750
                                                                           -----------
                                                                               349,250
                                                                           -----------
          TOTAL COMMON STOCKS -- (Cost $6,073,582)..........                 7,640,044
                                                                           -----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                       F-3
<PAGE>   99
                                AGA SERIES TRUST
                    CREDIT SUISSE GROWTH & INCOME PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                            SHARES        VALUE
- --------------------                                          ----------   -----------
<S>                                                           <C>          <C>
PREFERRED STOCK -- 0.4%
  FINANCE & BANKING -- 0.3%
     California Federal Preferred Capital Corporation.......       1,075   $    27,211
     NB Capital Corporation.................................         800        20,850
                                                                           -----------
                                                                                48,061
                                                                           -----------
  FINANCIAL SERVICES -- 0.1%
     Lehman Brothers Holdings Incorporated..................         310        13,640
                                                                           -----------
          TOTAL PREFERRED STOCK -- (Cost $64,063)...........                    61,701
                                                                           -----------
</TABLE>
 
<TABLE>
<CAPTION>
                                                              PRINCIPAL
                                                                AMOUNT
                                                              ----------
<S>                                                           <C>          <C>
MUNICIPALS -- 0.8%
     Florida State Board of Education
       4.75%, 06/01/2023....................................  $   10,000         9,732
     Illinois State
       4.75%, 06/01/2023....................................      15,000        14,474
     Massachusetts Bay Transport Authority
       4.75%, 03/01/2021....................................      10,000         9,487
     Massachusetts Water Resources Authority
       4.75%, 08/01/2027....................................      10,000         9,419
     Metropolitan Transportation Authority
       4.75%, 04/01/2028....................................      15,000        14,337
     Municipal Electric Authority
       5.00%, 01/01/2026....................................      30,000        29,563
     Nevada State
       4.75%, 05/15/2026....................................      25,000        23,821
     New York City Municipal Water Finance Authority
       4.75%, 06/15/2025....................................      10,000         9,578
     Ohio State Turnpike Commission
       4.75%, 02/15/2028....................................      10,000         9,693
     Triborough Bridge & Tunnel Authority
       4.75%, 01/01/2024....................................      10,000         9,618
                                                                           -----------
          TOTAL MUNICIPALS -- (Cost $137,562)...............                   139,722
                                                                           -----------
CORPORATE BONDS -- 7.8%
  AIR TRAVEL -- 0.5%
     Continental Airlines Incorporated
       9.50%, 12/15/2001....................................      20,000        20,900
     Northwest Airlines Incorporated
       7.63%, 03/15/2005....................................      40,000        37,918
     U. S. Air Incorporated
       9.63%, 02/01/2001....................................      25,000        25,931
                                                                           -----------
                                                                                84,749
                                                                           -----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                       F-4
<PAGE>   100
                                AGA SERIES TRUST
                    CREDIT SUISSE GROWTH & INCOME PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                              PRINCIPAL
SECURITY DESCRIPTION                                            AMOUNT        VALUE
- --------------------                                          ----------   -----------
<S>                                                           <C>          <C>
CORPORATE BONDS -- (CONTINUED)
  BROADCASTING -- 0.5%
     Belo (A.H.) Corporation
       6.88%, 06/01/2002....................................  $   20,000   $    20,495
     Fox Liberty Networks LLC
       8.88%, 08/15/2007....................................      30,000        30,600
     Tele-Communications Incorporated
       6.34%, 02/01/2002....................................      15,000        15,364
     Turner Broadcasting Systems Incorporated
       7.40%, 02/01/2004....................................      25,000        26,809
                                                                           -----------
                                                                                93,268
                                                                           -----------
  COMPUTERS & BUSINESS EQUIPMENT -- 0.2%
     Seagate Technology Incorporated 7.45%, 03/01/2037......      30,000        29,066
                                                                           -----------
  DRUGS & HEALTH CARE -- 0.7%
     Columbia/HCA Healthcare Corporation 8.36%,
      04/15/2024............................................      30,000        31,352
     Merck & Company Incorporated 5.76%, 05/03/2037.........      80,000        83,407
                                                                           -----------
                                                                               114,759
                                                                           -----------
  ELECTRIC UTILITIES -- 0.7%
     Beaver Valley II Funding Corporation 9.00%,
      06/01/2017............................................      30,000        34,614
     Connecticut Light & Power Company 7.75%, 06/01/2002....      10,000        10,322
       7.88%, 10/01/2024....................................      10,000        10,374
     Niagara Mohawk Power Corporation 8.75%, 04/01/2022.....      20,000        21,810
     North Atlantic Energy Corporation 9.05%, 06/01/2002....      19,000        19,741
     Texas Electrical Capital 8.18%, 01/30/2037.............      20,000        22,363
                                                                           -----------
                                                                               119,224
                                                                           -----------
  FINANCE & BANKING -- 1.8%
     AT&T Capital Corporation 6.41%, 08/13/1999.............      10,000        10,046
       6.48%, 12/03/1999....................................      25,000        25,277
       6.47%, 12/03/2099....................................      15,000        15,107
     Bay View Capital Corporation 9.13%, 08/15/2007.........      15,000        14,475
     Bellsouth Capital Funding Corporation 6.04%,
      11/15/2026............................................      80,000        83,252
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                       F-5
<PAGE>   101
                                AGA SERIES TRUST
                    CREDIT SUISSE GROWTH & INCOME PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                              PRINCIPAL
SECURITY DESCRIPTION                                            AMOUNT        VALUE
- --------------------                                          ----------   -----------
<S>                                                           <C>          <C>
CORPORATE BONDS -- (CONTINUED)
     Chase Manhattan Corporation 6.38%, 04/01/2008..........  $   20,000   $    20,700
       6.75%, 09/15/2006....................................      20,000        21,165
     Citicorp 6.38%, 11/15/2008.............................      30,000        31,122
     Compagnie Financiere de Paribas 6.95%, 07/22/2013......      30,000        29,226
     First Republic Bank 7.75%, 09/15/2012..................      10,000         9,784
     National Westminster Bancorporation 9.38%,
      11/15/2003............................................      10,000        11,460
     The Money Store Trust 6.04%, 08/15/2017................      25,000        25,013
                                                                           -----------
                                                                               296,627
                                                                           -----------
  HOTELS & RESTAURANTS -- 0.1%
     Hilton Hotels Corporation 7.95%, 04/15/2007............      20,000        20,723
  INDUSTRIALS -- 0.6%
     CSC Holdings Incorporated 7.88%, 12/15/2007............      20,000        20,732
     Dresser Industries Incorporated
       7.60%, 08/15/2096....................................      30,000        35,379
     Ford Motor Company
       6.63%, 10/01/2028....................................      40,000        41,155
                                                                           -----------
                                                                                97,266
                                                                           -----------
  LEISURE TIME -- 0.8%
     Time Warner Incorporated
       6.85%, 01/15/2026....................................      55,000        56,781
       8.05%, 01/15/2016....................................      25,000        29,225
       9.13%, 01/15/2013....................................      35,000        44,308
                                                                           -----------
                                                                               130,314
                                                                           -----------
  MINING -- 0.1%
     Southern Coal & Iron Corporation
       6.27%, 03/25/2019....................................      25,000        25,139
                                                                           -----------
  PETROLEUM SERVICES -- 0.2%
     Petroleum Geo-Services
       7.13%, 03/30/2028....................................      30,000        28,032
                                                                           -----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                       F-6
<PAGE>   102
                                AGA SERIES TRUST
                    CREDIT SUISSE GROWTH & INCOME PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                              PRINCIPAL
SECURITY DESCRIPTION                                            AMOUNT        VALUE
- --------------------                                          ----------   -----------
<S>                                                           <C>          <C>
CORPORATE BONDS -- (CONTINUED)
  TELECOMMUNICATIONS -- 1.4%
     Diamond Cable Communications PLC
       10.75%, 02/15/2007...................................  $   10,000   $     7,100
     GTE Corporation
       6.84%, 04/15/2018....................................      25,000        26,659
       6.94%, 04/15/2028....................................      40,000        43,442
     MCI Communications Corporation
       6.13%, 04/15/2002....................................      15,000        15,240
     Nextel Communications Incorporated
       9.75%, 08/15/2004....................................      35,000        33,950
     Paging Network Incorporated
       10.13%, 08/01/2007...................................      10,000         9,650
     TCI Communications Financing III
       9.65%, 03/31/2027....................................      20,000        24,697
     WorldCom Incorporated
       6.95%, 08/15/2028....................................      40,000        43,011
       8.88%, 01/15/2006....................................      30,000        32,681
                                                                           -----------
                                                                               236,430
                                                                           -----------
  TRANSPORTATION -- 0.2%
     Norfolk Southern Corporation
       7.05%, 05/01/2037....................................      35,000        37,864
                                                                           -----------
          TOTAL CORPORATE BONDS -- (Cost $1,286,095)........                 1,313,461
                                                                           -----------
FOREIGN CORPORATE BONDS -- 0.9%
  FINANCE & BANKING -- 0.6%
     Credit Lyonnais
       6.56%, 09/19/2049....................................      40,000        33,300
     Fuji Finance Caymon Limited
       7.30%, 03/29/2049....................................      20,000        13,425
       6.55%, 08/29/2049....................................      50,000        32,562
     Sparbanken Sverige
       7.50%, 11/29/2049....................................      10,000        10,013
                                                                           -----------
                                                                                89,300
                                                                           -----------
  FINANCIAL SERVICES -- 0.1%
     Auxiliaire Credit Foncier
       5.00%, 10/18/2002....................................      10,000         9,588
       5.28%, 09/25/2002....................................      10,000         9,484
                                                                           -----------
                                                                                19,072
                                                                           -----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                       F-7
<PAGE>   103
                                AGA SERIES TRUST
                    CREDIT SUISSE GROWTH & INCOME PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                              PRINCIPAL
SECURITY DESCRIPTION                                            AMOUNT        VALUE
- --------------------                                          ----------   -----------
<S>                                                           <C>          <C>
FOREIGN CORPORATE BONDS -- (CONTINUED)
  INDUSTRIALS -- 0.2%
     Osuuspankkien Kesk
       5.74%, 09/29/2049....................................  $   20,000   $    19,000
     YPF SA
       8.00%, 02/15/2004....................................      20,000        19,100
                                                                           -----------
                                                                                38,100
                                                                           -----------
  TRANSPORTATION -- 0.0%
     TFM, Sa De Cv
       11.75%, 06/15/2009...................................      10,000         4,650
                                                                           -----------
          TOTAL FOREIGN CORPORATE BONDS -- (Cost
            $161,811).......................................                   151,122
                                                                           -----------
FOREIGN GOVERNMENT BONDS -- 1.2%
     Government of Poland
       5.00%, 10/27/2014....................................     110,000       102,438
       5.00%, 10/27/2014....................................      20,000        18,626
     Republic of Argentina
       9.16%, 04/10/2005....................................      25,000        22,500
     Republic of Brazil
       6.13%, 04/15/2006....................................       9,600         6,204
     Republic of Colombia
       12.24%, 08/13/2005...................................      35,000        32,025
     Republic of Venezuela
       9.25%, 09/15/2027....................................      30,000        17,732
                                                                           -----------
          TOTAL FOREIGN GOVERNMENT BONDS -- (Cost
            $193,419).......................................                   199,525
                                                                           -----------
ASSET-BACKED SECURITIES -- 2.1%
  FINANCE & BANKING -- 1.5%
     Contimortgage Home Equity Loan Trust
       Series 1998-CF1, Class A5, 6.43%, 04/15/2016.........      15,000        15,169
       Series 1996-4, Class A8, 7.22%, 01/15/2028...........      10,000        10,203
     GMAC Commercial Mortgage Security Incorporated
       Series 1997-C1, Class A2, 6.85%, 09/15/2006..........      10,000        10,563
     Green Tree Financial Corporation
       Series 1998-4, Class A3, 5.98%, 08/01/2008...........      40,000        40,096
       Series 1998-C, Class A2, 6.03%, 07/15/2029...........      75,000        75,163
       Series 1997-6, Class A3, 6.32%, 01/15/2029...........       9,339         9,374
       Series 1997-3, Class A3, 6.73%, 07/15/2028...........      55,000        55,446
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                       F-8
<PAGE>   104
                                AGA SERIES TRUST
                    CREDIT SUISSE GROWTH & INCOME PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                              PRINCIPAL
SECURITY DESCRIPTION                                            AMOUNT        VALUE
- --------------------                                          ----------   -----------
<S>                                                           <C>          <C>
ASSET-BACKED SECURITIES -- (CONTINUED)
     IMC Home Equity Loan Trust
       Series 1998-3, Class A3, 6.16%, 05/20/2014...........  $   15,000   $    15,034
     New Century Home Equity Loan Trust
       Series 1997-6, Class A4, 6.73%, 07/25/2022...........      10,000         9,760
     UCFC Loan Trust
       Series 1996-B, Class A7, 8.20%, 11/15/2027...........      10,000        10,701
                                                                           -----------
                                                                               251,509
                                                                           -----------
  FINANCIAL SERVICES -- 0.6%
     First USA Credit Card Master Trust
       Series 1997-6, Class A, 6.42%, 03/17/2005............      45,000        46,350
     Green Tree Recreational Equipment
       Series 1998-B, Class A3, 6.05%, 10/15/2010...........      20,000        20,258
     K Mart Corporation
       Series 1995-K, 8.54%, 01/02/2015.....................      14,746        14,987
     Nationscredit Grantor Trust
       Series 1996-1, Class A, 5.85%, 09/15/2011............      10,604        10,613
     Structured Asset Securities Corporation
       Series 1996-CFL, Class A1C, 5.944%, 02/25/2028.......       2,728         2,725
                                                                           -----------
                                                                                94,933
                                                                           -----------
          TOTAL ASSET-BACKED SECURITIES -- (Cost
            $345,700).......................................                   346,442
                                                                           -----------
U.S. GOVERNMENT AND AGENCY SECURITIES -- 28.0%
  FEDERAL AGENCIES -- 17.0%
     Federal National Mortgage Association
       0.00%, 02/25/2023....................................      25,000        20,939
       6.00%, 12/01/TBA.....................................     275,000       275,688
       6.00%, 12/01/TBA.....................................     130,000       128,293
       6.00%, 12/01/TBA.....................................   1,000,000       986,870
       6.50%, 12/01/TBA.....................................     325,000       327,132
       6.50%, 12/01/TBA.....................................     135,000       136,898
       8.00%, 12/01/TBA.....................................     565,000       585,125
     Government National Mortgage Association
       6.50%, 12/15/TBA.....................................     345,000       348,450
     Tennessee Valley Authority
       5.88%, 04/01/2036....................................      20,000        21,223
                                                                           -----------
                                                                             2,830,618
                                                                           -----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                       F-9
<PAGE>   105
                                AGA SERIES TRUST
                    CREDIT SUISSE GROWTH & INCOME PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                              PRINCIPAL
SECURITY DESCRIPTION                                            AMOUNT        VALUE
- --------------------                                          ----------   -----------
<S>                                                           <C>          <C>
GOVERNMENT AND AGENCY SECURITIES -- (CONTINUED)
  U.S. GOVERNMENT -- 11.0%
     United States Treasury Bills
       3.82%, 01/07/1999....................................  $   10,000   $     9,994
     United States Treasury Bonds
       6.88%, 08/15/2025....................................     270,000       327,248
     United States Treasury Notes
       6.25%, 06/30/2002....................................   1,310,000     1,375,094
       6.25%, 02/15/2007....................................     120,000       131,624
                                                                           -----------
                                                                             1,843,960
                                                                           -----------
          TOTAL U.S. GOVERNMENT AND AGENCY SECURITIES --
            (Cost $4,649,510)...............................                 4,674,578
                                                                           -----------
REPURCHASE AGREEMENT -- 28.6%
(Cost $4,784,000)
     State Street Bank and Trust Company, 3.25% dated
      12/31/1998, to be repurchased at $4,785,728 on
      01/04/1999, collateralized by a $4,670,000 par value
      U.S. Treasury Note, 6.625% due 06/30/2001, with a
      value of $4,880,150...................................   4,784,000     4,784,000
                                                                           -----------
TOTAL INVESTMENTS -- (COST $17,695,742*) -- 115.5%..........                19,310,595
                                                                           -----------
OTHER ASSETS LESS LIABILITIES -- (15.5)%....................                (2,597,469)
                                                                           -----------
NET ASSETS -- 100.0%........................................               $16,713,126
                                                                           ===========
</TABLE>
 
SCHEDULE OF OPEN FUTURES CONTRACTS AT DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
 NUMBER
   OF                               CONTRACT                            TOTAL CONTRACT   UNREALIZED
CONTRACTS                         DESCRIPTION                               VALUE        GAIN (LOSS)
- ---------                         -----------                           --------------   -----------
<C>        <S>                                                          <C>              <C>
    3      U.S. Treasury 5 Year Note March 1999 (long)...............     $ 340,031        $(1,909)
    1      U.S. Treasury Bond March 1999 (long)......................       127,781             49
    3      U.S. Treasury 10 Year Note March 1999 (short).............      (357,469)        (1,237)
                                                                                           -------
                                                                                           $(3,097)
                                                                                           =======
</TABLE>
 
- ---------------
 
(a) Non-income producing security
ADR -- American Depository Receipt
TBA -- To Be Announced
 
* Aggregate cost for Federal tax purposes is $17,700,610. Aggregate gross
  unrealized appreciation for all securities in which there is an excess of
  value over tax cost and aggregate gross unrealized depreciation for all
  securities in which there is an excess of tax cost over value were $1,748,661
  and $138,773, respectively, resulting in net unrealized appreciation of
  $1,609,888.
 
    The accompanying notes are an integral part of the financial statements
                                      F-10
<PAGE>   106
 
                                AGA SERIES TRUST
                  CREDIT SUISSE INTERNATIONAL EQUITY PORTFOLIO
 
                            SCHEDULE OF INVESTMENTS
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                           SHARES       VALUE
- --------------------                                           ------     ----------
<S>                                                           <C>         <C>
COMMON STOCKS -- 89.2%
  BRAZIL -- 1.5%
     Companhia Paranaense De Energia-Copel..................    12,300    $   87,637
                                                                          ----------
  CANADA -- 0.6%
     Rogers Communications Incorporated(a)..................     4,000        35,721
                                                                          ----------
  CHILE -- 1.0%
     Five Arrows Chile Investment Trust Limited.............    20,000        35,680
     Genesis Chile Fund.....................................     1,000        24,750
                                                                          ----------
                                                                              60,430
                                                                          ----------
  CROATIA -- 0.3%
     Pliva D.D. GDR.........................................     1,000        16,350
                                                                          ----------
  CZECH REPUBLIC -- 0.7%
     Ateso AS...............................................     2,000        19,990
     Deza Valasske Mezirici AS..............................     1,000        17,825
     Galena AS..............................................       600         6,317
                                                                          ----------
                                                                              44,132
                                                                          ----------
  DENMARK -- 1.2%
     ISS International Service System A/S...................     1,114        72,466
                                                                          ----------
  FRANCE -- 10.9%
     Alcatel Alsthom SA.....................................       417        51,016
     AXA SA.................................................       605        87,650
     Carrefour SA...........................................       105        79,234
     Cofinec GDR(a).........................................     3,000        17,850
     Lafarge SA.............................................       720        68,381
     Rhodia SA(a)...........................................     2,229        33,888
     Rhone-Poulenc (India) Limited..........................     1,558        80,143
     Societe BIC SA.........................................       673        37,315
     Total SA...............................................       544        55,071
     Valeo SA...............................................       739        58,211
     Vivendi................................................       325        84,287
                                                                          ----------
                                                                             653,046
                                                                          ----------
  GERMANY -- 5.3%
     Bayerische Motoren Werke (BMW)(a)......................        16        11,857
     Bayerische Motoren Werke AG............................        69        53,532
     Dresdner Bank AG.......................................       856        35,954
     Mannesmann AG..........................................       682        78,160
     Preussag AG............................................       181        81,779
     Viag AG................................................       100        58,622
                                                                          ----------
                                                                             319,904
                                                                          ----------
  HONG KONG -- 0.6%
     Hong Kong Telecommunications Limited...................     5,000         8,744
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-11
<PAGE>   107
                                AGA SERIES TRUST
                  CREDIT SUISSE INTERNATIONAL EQUITY PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                           SHARES       VALUE
- --------------------                                           ------     ----------
<S>                                                           <C>         <C>
COMMON STOCKS -- (CONTINUED)
     Hutchison Whampoa Limited..............................     2,000    $   14,069
     Jardine Strategic Holdings Limited.....................     3,000         4,350
     Wing Hang Bank Limited.................................     2,500         6,228
                                                                          ----------
                                                                              33,391
                                                                          ----------
  HUNGARY -- 0.5%
     BorsodChem GDR.........................................       170         4,412
     Matav RT...............................................       320         9,540
     MOL Magyar Olaj-es Gazipari GDR........................       600        16,500
                                                                          ----------
                                                                              30,452
                                                                          ----------
  INDIA -- 1.3%
     India Fund.............................................    12,000        75,750
                                                                          ----------
  ISRAEL -- 0.4%
     Electric Fuel Corporation(a)...........................     2,500         6,875
     Koor Industries Limited ADR............................     1,500        26,156
                                                                          ----------
                                                                              33,031
                                                                          ----------
  ITALY -- 6.3%
     Assicurazioni Generali SPA.............................     2,013        84,005
     Banco Intesa SPA.......................................    12,425        74,507
     Ente Nazionale Idrocarburi SPA.........................     9,350        61,072
     Telecom Italia Mobile (TIM) SPA........................    11,719        86,469
     Telecom Italia SPA.....................................     8,650        73,764
                                                                          ----------
                                                                             379,817
                                                                          ----------
  JAPAN -- 17.8%
     Acom Company Limited...................................     1,000        64,219
     Advantest..............................................       100         6,333
     Amada Company..........................................     3,000        14,516
     Bank of Tokyo Mitsubishi Limited.......................     3,000        31,048
     Banyu Pharmaceutical Company...........................     2,000        37,152
     Canon Incorporated.....................................     3,000        64,087
     Daiwa Securities.......................................    13,000        44,387
     East Japan Railway.....................................         6        33,490
     Eisai Company..........................................     1,500        29,191
     FamilyMart Company Limited.............................     1,000        49,889
     Fanuc..................................................     1,000        34,233
     Honda Motor Company....................................     1,000        32,817
     Japan Airport Terminal.................................     2,000        12,295
     Japan Tobacco Incorporated.............................         5        49,978
     Maeda Road Construction................................     2,000        13,428
     Mitsubishi Heavy Industries............................     5,000        19,460
     NEC Corporation........................................     4,000        36,798
     Nippon Telegraph & Telephone...........................         9        69,420
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-12
<PAGE>   108
                                AGA SERIES TRUST
                  CREDIT SUISSE INTERNATIONAL EQUITY PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                           SHARES       VALUE
- --------------------                                           ------     ----------
<S>                                                           <C>         <C>
COMMON STOCKS -- (CONTINUED)
     Nitto Denko Corporation................................     2,000    $   33,260
     Olympus Optical Company Limited........................     6,000        68,943
     Santen Pharmaceutical Company..........................     1,210        23,226
     Sanwa Bank Limited.....................................     2,000        15,409
     Sony Corporation.......................................     1,000        72,800
     Sumitomo Osaka Cement Company Limited..................     7,000        13,065
     Takefuji Corporation...................................     1,200        87,572
     Terumo Corporation.....................................     2,000        47,059
     Toyota Motor Corporation...............................     2,000        54,312
                                                                          ----------
                                                                           1,058,387
                                                                          ----------
  KOREA -- 0.1%
     Pohang Iron & Steel Company Limited....................       500         8,438
                                                                          ----------
  MALAYSIA -- 0.2%
     YTL Corporation Berhad.................................     8,000        10,400
                                                                          ----------
  NETHERLANDS -- 6.4%
     ING Groep NV...........................................     1,100        67,041
     Laurus NV..............................................     2,185        55,128
     Oce NV.................................................     1,610        57,846
     Philips Electronics NV.................................     1,010        67,738
     TNT Post Group NV......................................     3,130       100,796
     Vendex NV..............................................     1,550        37,622
                                                                          ----------
                                                                             386,171
                                                                          ----------
  NEW ZEALAND -- 0.2%
     Telecom Corporation of New Zealand.....................     6,000        13,829
                                                                          ----------
  PERU -- 0.6%
     Telefonica del Peru ADR................................     3,000        38,062
                                                                          ----------
  PHILIPPINES -- 0.2%
     SM Prime Holdings......................................    55,000        10,463
                                                                          ----------
  POLAND -- 0.8%
     Elektrim Spolka Akcyjan SA.............................     4,250        46,011
                                                                          ----------
  PORTUGAL -- 1.0%
     EDP-Electricidade de Portugal SA.......................     2,826        62,248
                                                                          ----------
  SINGAPORE -- 0.2%
     Singapore Technologies Engineering Limited.............    12,045        11,235
                                                                          ----------
  SLOVAKIA -- 0.2%
     Vychodoslovenske Zeleziarne AS.........................     2,000         9,508
                                                                          ----------
  SPAIN -- 2.4%
     Banco Bilbao Vizcaya SA................................     4,539        71,062
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-13
<PAGE>   109
                                AGA SERIES TRUST
                  CREDIT SUISSE INTERNATIONAL EQUITY PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                           SHARES       VALUE
- --------------------                                           ------     ----------
<S>                                                           <C>         <C>
COMMON STOCKS -- (CONTINUED)
     Telefonica de Espana...................................     1,606    $   71,305
                                                                          ----------
                                                                             142,367
                                                                          ----------
  SWEDEN -- 1.7%
     Atlas Copco AB.........................................     1,865        40,400
     Electrolux AB..........................................     3,595        61,725
                                                                          ----------
                                                                             102,125
                                                                          ----------
  SWITZERLAND -- 6.7%
     Nestle SA..............................................        34        74,004
     Novartis AG............................................        39        76,654
     Roche Holdings AG......................................         8        97,605
     SchweizerischeRueckversicherungs-Gesellschaft..........        29        75,598
     Zurich Allied AG(a)....................................       106        78,476
                                                                          ----------
                                                                             402,337
                                                                          ----------
  THAILAND -- 0.2%
     Electricity Generating Public Company Limited..........     5,000        13,549
                                                                          ----------
  TURKEY -- 0.5%
     Turkish Investment Fund Incorporated...................     7,000        30,625
                                                                          ----------
  UNITED KINGDOM -- 19.4%
     Asda Group PLC.........................................    29,000        77,812
     BAA PLC................................................     6,400        75,175
     BG PLC.................................................    10,700        68,797
     Boots Company PLC......................................     4,655        79,581
     British Telecom PLC....................................     4,880        73,861
     CGU PLC................................................     5,090        80,253
     Compass Group PLC......................................     6,520        74,418
     GKN PLC................................................     5,900        78,418
     Granada Group PLC......................................     4,650        81,504
     Lloyds TSB Group PLC...................................     5,600        79,734
     Pearson PLC............................................     4,100        81,527
     Shell Transport & Trading Company......................    12,150        74,689
     SmithKline Beecham PLC.................................     5,600        77,612
     Unilever PLC...........................................     7,200        80,984
     Vodafone Group PLC.....................................     4,850        78,806
                                                                          ----------
                                                                           1,163,171
                                                                          ----------
TOTAL COMMON STOCKS -- (Cost $5,065,292)....................               5,351,053
                                                                          ----------
RIGHTS -- 0.0%
(Cost $990)
  SPAIN -- 0.0%
     Telefonica SA(a).......................................     1,606         1,424
                                                                          ----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-14
<PAGE>   110
                                AGA SERIES TRUST
                  CREDIT SUISSE INTERNATIONAL EQUITY PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                           SHARES       VALUE
- --------------------                                           ------     ----------
<S>                                                           <C>         <C>
WARRANTS -- 0.9%
  AUSTRALIA -- 0.2%
     BT Australian Equity Management Limited(a).............     3,000    $   11,048
                                                                          ----------
  FRANCE -- 0.0%
     Vivendi(a).............................................       175           454
                                                                          ----------
  JAPAN -- 0.7%
     Fleming Japan Investor(a)..............................    60,000           748
     Schroder Japan Growth Fund(a)..........................   175,000        42,158
                                                                          ----------
                                                                              42,906
                                                                          ----------
TOTAL WARRANTS -- (Cost $184,325)...........................                  54,408
                                                                          ----------
PREFERRED STOCK -- 1.4%
(Cost $57,195)
  GERMANY -- 1.4%
     Henkel KGaA............................................       897        80,195
</TABLE>
 
<TABLE>
<CAPTION>
                                                              PRINCIPAL
                                                               AMOUNT
                                                              --------
<S>                                                           <C>         <C>
REPURCHASE AGREEMENT -- 8.8%
(Cost $529,000)
  State Street Bank and Trust Company, 2.00% dated
     12/31/1998, to be repurchased at $529,118 on
     01/04/1999, collateralized by a $370,000 par value U.S.
     Treasury Note, 9.25% due 02/15/2016, with a value of
     $544,420...............................................  $529,000       529,000
                                                                          ----------
TOTAL INVESTMENTS -- (COST $5,836,802*) -- 100.3%...........               6,016,080
                                                                          ----------
OTHER ASSETS LESS LIABILITIES -- (0.3)%.....................                 (20,122)
                                                                          ----------
NET ASSETS -- 100.0%........................................              $5,995,958
                                                                          ==========
</TABLE>
 
(a) Non-income producing security
GDR -- Global Depository Receipt
ADR -- American Depository Receipt
 
*  Aggregate cost for Federal tax purposes is $5,868,942. Aggregate gross
   unrealized appreciation for all securities in which there is an excess of
   value over tax cost and aggregate gross unrealized depreciation for all
   securities in which there is an excess of tax cost over value were $825,786
   and $678,648, respectively, resulting in net unrealized appreciation of
   $147,138.
 
    The accompanying notes are an integral part of the financial statements
                                      F-15
<PAGE>   111
                                AGA SERIES TRUST
                  CREDIT SUISSE INTERNATIONAL EQUITY PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                               PERCENT OF
INDUSTRY                                                       NET ASSETS
- --------                                                       ----------
<S>                                                            <C>
Appliances..................................................       1.0%
Auto Parts..................................................       0.3
Automobiles.................................................       2.5
Banks.......................................................       6.6
Broadcasting................................................       0.6
Business Services...........................................       7.0
Chemicals...................................................       2.3
Conglomerates...............................................       2.8
Construction Materials......................................       1.6
Construction & Mining Equipment.............................       0.7
Drugs & Health Care.........................................       8.2
Electric Utilities..........................................       2.7
Electrical Equipment........................................       1.4
Electronics.................................................       1.4
Financial Services..........................................       6.0
Food & Beverages............................................       3.3
Household Appliances & Home Furnishings.....................       2.3
Industrial Machinery........................................       2.8
Insurance...................................................       6.8
Leisure Time................................................       1.6
Mutual Funds................................................       2.4
Office Furnishings & Supplies...............................       2.7
Oil & Gas...................................................       1.3
Petroleum Services..........................................       3.3
Photography.................................................       1.1
Publishing..................................................       1.4
Railroads & Equipment.......................................       0.6
Real Estate.................................................       0.2
Retail Trade................................................       6.3
Steel.......................................................       0.3
Telecommunications..........................................      10.0
                                                                 -----
  TOTAL INVESTMENTS BY INDUSTRY CLASSIFICATION..............      91.5
Repurchase Agreement........................................       8.8
                                                                 -----
  TOTAL INVESTMENTS.........................................     100.3%
                                                                 =====
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-16
<PAGE>   112
 
                                AGA SERIES TRUST
                              ELITEVALUE PORTFOLIO
 
                            SCHEDULE OF INVESTMENTS
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                          SHARES     VALUE
- --------------------                                          ------   ----------
<S>                                                           <C>      <C>
COMMON STOCKS -- 76.8%
  AEROSPACE -- 3.3%
     Allied Signal Incorporated.............................   2,300   $  101,919
     Boeing Company.........................................  17,600      574,200
                                                                       ----------
                                                                          676,119
                                                                       ----------
  AIR TRAVEL -- 1.8%
     UAL Corporation(a).....................................   6,200      370,063
                                                                       ----------
  BANKS -- 4.0%
     BankBoston Corporation.................................  10,000      389,375
     M & T Bank Corporation.................................     850      441,097
                                                                       ----------
                                                                          830,472
                                                                       ----------
  BROADCASTING & CABLE -- 1.9%
     News Corporation Limited ADR...........................  16,000      395,000
                                                                       ----------
  CHEMICALS -- 6.6%
     Dow Chemical Company...................................   2,900      263,719
     Du Pont (E.I.) de Nemours & Company....................  11,600      615,525
     Hercules Incorporated..................................   2,600       71,175
     Monsanto Company.......................................   5,000      237,500
     Solutia Incorporated...................................   8,000      179,000
                                                                       ----------
                                                                        1,366,919
                                                                       ----------
  COMMERCIAL SERVICES -- 2.1%
     R.R. Donnelley & Sons Company..........................  10,000      438,125
                                                                       ----------
  CONSTRUCTION & MINING EQUIPMENT -- 1.9%
     Caterpillar Incorporated...............................   8,500      391,000
                                                                       ----------
  DRUGS & HEALTH CARE -- 0.6%
     Becton, Dickinson & Company............................   3,000      128,063
                                                                       ----------
  ELECTRONICS -- 3.4%
     Avnet Incorporated.....................................   2,000      121,000
     ITT Industries Incorporated............................  14,500      576,375
                                                                       ----------
                                                                          697,375
                                                                       ----------
  FEDERAL AGENCIES -- 5.3%
     Federal Home Loan Mortgage Corporation.................  17,000    1,095,437
                                                                       ----------
  FINANCIAL SERVICES -- 8.9%
     Citigroup Incorporated.................................  18,750      928,125
     Wells Fargo Company....................................  22,500      898,594
                                                                       ----------
                                                                        1,826,719
                                                                       ----------
  FOOD & BEVERAGES -- 3.8%
     Diageo PLC ADR.........................................  16,800      777,000
                                                                       ----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements.
                                      F-17
<PAGE>   113
                                AGA SERIES TRUST
                              ELITEVALUE PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                          SHARES     VALUE
- --------------------                                          ------   ----------
<S>                                                           <C>      <C>
COMMON STOCKS -- (CONTINUED)
  HOTELS & RESTAURANTS -- 5.5%
     McDonald's Corporation.................................  14,700   $1,126,387
                                                                       ----------
  INSURANCE -- 5.0%
     ACE Limited............................................  10,000      344,375
     Exel Limited...........................................   9,200      690,000
                                                                       ----------
                                                                        1,034,375
                                                                       ----------
  MANUFACTURING -- 1.4%
     Tenneco Incorporated...................................   3,700      126,031
     Varian Associates Incorporated.........................   4,000      151,500
                                                                       ----------
                                                                          277,531
                                                                       ----------
  MULTI INDUSTRY COMPANIES -- 3.4%
     Minnesota Mining & Manufacturing Company...............   6,000      426,750
     Textron Incorporated...................................   3,700      280,969
                                                                       ----------
                                                                          707,719
                                                                       ----------
  MULTIMEDIA -- 5.1%
     Time Warner Incorporated...............................  17,000    1,055,062
                                                                       ----------
  OIL & GAS -- 0.9%
     Unocal Corporation.....................................   6,000      175,125
                                                                       ----------
  PAPER -- 1.6%
     Champion International Corporation.....................   8,000      324,000
                                                                       ----------
  SOFTWARE -- 1.2%
     Computer Associates International Incorporated.........   6,000      255,750
                                                                       ----------
  TELECOMMUNICATIONS -- 4.5%
     Sprint Corporation.....................................   5,500      462,688
     US West Incorporated...................................   7,300      471,762
                                                                       ----------
                                                                          934,450
                                                                       ----------
  TOBACCO -- 3.1%
     Philip Morris Companies Incorporated...................  12,000      642,000
                                                                       ----------
  TOYS & AMUSEMENTS -- 1.5%
     Mattel Incorporated....................................  13,700      312,531
                                                                       ----------
TOTAL COMMON STOCKS -- (Cost $14,612,863)...................           15,837,222
                                                                       ----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements.
                                      F-18
<PAGE>   114
                                AGA SERIES TRUST
                              ELITEVALUE PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                              PRINCIPAL
                                                                AMOUNT        VALUE
                                                              ----------   -----------
<S>                                                           <C>          <C>
DISCOUNT NOTES -- 23.2%
  FEDERAL AGENCIES -- 23.2%
     Federal Farm Credit Bank
       5.00%, 01/22/1999**..................................  $1,890,000   $ 1,884,487
     Federal Home Loan Bank
       4.30%, 01/04/1999**..................................   2,895,000     2,893,963
                                                                           -----------
          TOTAL DISCOUNT NOTES -- (Cost $4,778,450).........                 4,778,450
                                                                           -----------
TOTAL INVESTMENTS -- (COST $19,391,313*) -- 100.0%..........               $20,615,672
                                                                           -----------
OTHER ASSETS LESS LIABILITIES -- 0.0%.......................                     4,258
                                                                           -----------
NET ASSETS -- 100.0%........................................               $20,619,930
                                                                           ===========
</TABLE>
 
(a) Non-income producing security
ADR-American Depository Receipt
 
 * Aggregate cost for Federal tax purposes is $19,430,004. Aggregate gross
   unrealized appreciation for all securities in which there is an excess of
   value over tax cost and aggregate gross unrealized depreciation for all
   securities in which there is an excess of tax cost over value are $2,145,683
   and $960,015, respectively, resulting in net unrealized appreciation of
   $1,185,668.
 
** The rate shown reflects the current yield at December 31, 1998.
 
    The accompanying notes are an integral part of the financial statements.
                                      F-19
<PAGE>   115
 
                                AGA SERIES TRUST
             SALOMON BROTHERS U.S. GOVERNMENT SECURITIES PORTFOLIO
 
                            SCHEDULE OF INVESTMENTS
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                              PRINCIPAL
                    SECURITY DESCRIPTION                        AMOUNT        VALUE
                    --------------------                      ---------       -----
<S>                                                           <C>          <C>
U.S. GOVERNMENT AND AGENCY SECURITIES -- 80.1%
  FEDERAL AGENCIES -- 61.5%
     Federal Home Loan Bank
       5.80%, 09/02/2008....................................  $  150,000   $   154,738
     Federal Home Loan Mortgage Corporation
       5.89%, 07/24/2000....................................     225,000       228,024
       6.00%, 12/01/TBA.....................................     500,000       493,905
       6.247%, 03/17/2021...................................     100,000       102,854
       6.50%, 08/01/2013....................................     474,293       481,560
       7.00%, 04/15/2021....................................      43,057        43,528
       8.25%, 04/01/2017....................................      13,620        14,269
       11.75%, 07/01/2006...................................       8,336         9,130
       11.75%, 07/01/2013...................................       2,694         2,894
     Federal National Mortgage Association
       6.00%, 12/01/TBA.....................................     600,000       592,122
       6.50%, 08/01/2027....................................     212,757       214,153
       6.50%, 12/01/TBA.....................................   1,100,000     1,107,216
       6.53%, 05/25/2030....................................     150,000       155,633
       6.91%, 12/28/2028....................................     148,828       151,254
       7.00%, 05/01/2026....................................     139,520       142,354
       7.00%, 12/01/TBA.....................................     450,000       459,000
       9.00%, 10/01/2026....................................      98,075       103,759
       10.00%, 09/01/2020...................................     150,000       162,563
       11.50%, 09/01/2019...................................      12,107        13,538
       12.00%, 10/01/2015...................................      44,094        49,923
       12.00%, 01/15/2016...................................       2,457         2,863
       12.50%, 09/20/2015...................................       5,665         6,628
       13.00%, 11/15/2015...................................      12,435        14,829
       14.50%, 11/15/2014...................................       4,353         5,264
     Government National Mortgage Association
       7.50%, 05/15/2027....................................     108,217       111,572
       7.50%, 07/15/2027....................................     160,024       164,984
       9.00%, 10/20/2016....................................      52,238        55,714
     Student Loan Marketing Association
       7.20%, 11/09/2000....................................     225,000       233,577
     United States Department of Veteran Affairs
       7.25%, 10/15/2010....................................      59,509        59,675
                                                                           -----------
                                                                             5,337,523
                                                                           -----------
  U.S. GOVERNMENT -- 18.6%
     United States Treasury Bond
       5.25%, 11/15/2028....................................      50,000        51,188
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-20
<PAGE>   116
                                AGA SERIES TRUST
             SALOMON BROTHERS U.S. GOVERNMENT SECURITIES PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                              PRINCIPAL
                    SECURITY DESCRIPTION                        AMOUNT        VALUE
                    --------------------                      ---------       -----
<S>                                                           <C>          <C>
U.S. GOVERNMENT AND AGENCY SECURITIES -- (CONTINUED)
     United States Treasury Notes
       4.50%, 09/30/2000....................................  $  500,000   $   498,905
       5.63%, 12/31/2002....................................      50,000        51,664
       5.63%, 05/15/2008....................................     650,000       693,569
       5.75%, 04/30/2003....................................     100,000       104,094
       5.88%, 09/30/2002....................................     100,000       103,937
       6.13%, 08/15/2007....................................     100,000       109,219
                                                                           -----------
                                                                             1,612,576
                                                                           -----------
TOTAL U.S. GOVERNMENT AND AGENCY SECURITIES -- (Cost
  $6,891,417)...............................................                 6,950,099
                                                                           -----------
REPURCHASE AGREEMENTS -- 50.4%
     J.P. Morgan & Company, 4.68% dated 12/31/1998, to be
      repurchased at $375,195 on 01/04/1999, collateralized
      by a $314,000 par value U.S. Treasury Note, 6.75% due
      8/15/2026, with a value of $383,001...................     375,000       375,000
     State Street Bank and Trust Company, 4.85% dated
      12/31/1998, to be repurchased at $2,001,078 on
      01/04/1999, collateralized by a $1,890,000 par value
      U.S. Treasury Note, 6.25% due 02/15/2003, with a value
      of $2,043,563.........................................   2,000,000     2,000,000
     Swiss Bank, 4.75% dated 12/31/1998, to be repurchased
      at $2,001,056 on 01/04/1999, collateralized by a
      $1,680,000 par value U.S. Treasury Note, 6.75% due
      08/15/2026, with a value of $2,041,200................   2,000,000     2,000,000
                                                                           -----------
TOTAL REPURCHASE AGREEMENTS -- (Cost $4,375,000)............                 4,375,000
                                                                           -----------
TOTAL INVESTMENTS -- (COST $11,266,417*) -- 130.5%..........                11,325,099
                                                                           -----------
OTHER ASSETS LESS LIABILITIES -- (30.5)%....................                (2,645,906)
                                                                           -----------
NET ASSETS -- 100.0%........................................               $ 8,679,193
                                                                           ===========
</TABLE>
 
TBA -- To Be Announced
 
* Aggregate cost for Federal tax purposes is identical. Aggregate gross
  unrealized appreciation for all securities in which there is an excess of
  value over tax cost and aggregate gross unrealized depreciation for all
  securities in which there is an excess of tax cost over value were $77,670 and
  $18,988, respectively, resulting in net unrealized appreciation of $58,682.
 
    The accompanying notes are an integral part of the financial statements
                                      F-21
<PAGE>   117
 
                                AGA SERIES TRUST
              STATE STREET GLOBAL ADVISORS GROWTH EQUITY PORTFOLIO
 
                            SCHEDULE OF INVESTMENTS
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                          SHARES      VALUE
- --------------------                                          -------   ----------
<S>                                                           <C>       <C>
COMMON STOCKS -- 97.9%
  AEROSPACE -- 2.9%
     General Dynamics Corporation...........................    3,700   $  216,912
     Gulfstream Aerospace Corporation(a)....................    3,900      207,675
     United Technologies Corporation........................      300       32,625
                                                                        ----------
                                                                           457,212
                                                                        ----------
  ALUMINUM -- 0.7%
     Aluminum Company of America............................    1,500      111,844
                                                                        ----------
  AUTOMOBILES -- 2.0%
     Ford Motor Company.....................................    5,100      299,306
     PACCAR Incorporated....................................      300       12,338
                                                                        ----------
                                                                           311,644
                                                                        ----------
  BANKS -- 4.9%
     BankAmerica Corporation................................    1,805      108,526
     Chase Manhattan Corporation............................    3,800      258,637
     First Union Corporation................................    1,400       85,137
     Fleet Financial Group Incorporated.....................    5,600      250,250
     UnionBanCal Corporation................................    1,500       51,094
                                                                        ----------
                                                                           753,644
                                                                        ----------
  BUSINESS SERVICES -- 1.0%
     Computer Sciences Corporation..........................      100        6,444
     Unisys Corporation(a)..................................    4,200      144,637
                                                                        ----------
                                                                           151,081
                                                                        ----------
  CHEMICALS -- 1.1%
     Solutia Incorporated...................................    7,400      165,575
                                                                        ----------
  COMMERCIAL SERVICES -- 1.0%
     R.R. Donnelley & Sons Company..........................    3,400      148,963
                                                                        ----------
  COMPUTERS & BUSINESS EQUIPMENT -- 9.8%
     Dell Computer Corporation(a)...........................      800       58,550
     EMC Corporation(a).....................................      100        8,500
     Gateway 2000 Incorporated(a)...........................    1,500       76,781
     International Business Machines........................    2,900      535,775
     Lexmark International Group Incorporated(a)............    2,700      271,350
     Quantum Corporation(a).................................   10,100      214,625
     Sun Microsystems Incorporated(a).......................    2,200      188,375
     Tech Data Corporation(a)...............................    4,100      165,025
                                                                        ----------
                                                                         1,518,981
                                                                        ----------
  CONSTRUCTION MATERIALS -- 0.6%
     USG Corporation........................................    1,700       86,594
                                                                        ----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-22
<PAGE>   118
                                AGA SERIES TRUST
              STATE STREET GLOBAL ADVISORS GROWTH EQUITY PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                          SHARES      VALUE
- --------------------                                          -------   ----------
<S>                                                           <C>       <C>
<->COMMON STOCKS -- (CONTINUED)
  DRUGS & HEALTH CARE -- 13.8%
     Abbott Laboratories....................................      700   $   34,300
     American Home Products Corporation.....................      700       39,419
     Amgen Incorporated(a)..................................    2,900      303,231
     Arterial Vascular Engineering Incorporated(a)..........    3,400      178,500
     Becton, Dickinson & Company............................    2,200       93,912
     Bergen Brunswig Corporation............................    6,600      230,175
     Bristol Myers Squibb Company...........................    2,100      281,006
     Eli Lilly & Company....................................      700       62,213
     Guidant Corporation....................................      600       66,150
     Johnson & Johnson......................................    1,100       92,263
     McKesson Corporation...................................      100        7,906
     Meditrust..............................................    2,700       40,838
     Merck & Company Incorporated...........................    1,500      221,531
     Pfizer Incorporated....................................    1,400      175,612
     Schering-Plough Corporation............................    1,000       55,250
     Wellpoint Health Networks Incorporated(a)..............    2,900      252,300
                                                                        ----------
                                                                         2,134,606
                                                                        ----------
  ELECTRIC UTILITIES -- 2.0%
     Energy East Corporation................................    1,000       56,500
     GPU Incorporated.......................................      800       35,350
     PP&L Resources Incorporated............................    4,800      133,800
     Public Service Enterprise Group........................    2,200       88,000
                                                                        ----------
                                                                           313,650
                                                                        ----------
  ELECTRONICS -- 3.3%
     Arrow Electronics Incorporated(a)......................      200        5,337
     Intel Corporation......................................    4,300      509,819
                                                                        ----------
                                                                           515,156
                                                                        ----------
  FEDERAL AGENCIES -- 0.9%
     Federal National Mortgage Association..................    1,900      140,600
                                                                        ----------
  FINANCIAL SERVICES -- 2.9%
     Citigroup Incorporated.................................    2,400      118,800
     Countrywide Credit Industries Incorporated.............    1,700       85,319
     Lehman Brothers Holdings Incorporated..................    5,500      242,343
                                                                        ----------
                                                                           446,462
                                                                        ----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-23
<PAGE>   119
                                AGA SERIES TRUST
              STATE STREET GLOBAL ADVISORS GROWTH EQUITY PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                          SHARES      VALUE
- --------------------                                          -------   ----------
<S>                                                           <C>       <C>
<->COMMON STOCKS -- (CONTINUED)
  FOOD & BEVERAGES -- 3.3%
     Coca-Cola Company......................................    3,000   $  200,625
     General Mills Incorporated.............................    1,100       85,525
     IBP Incorporated.......................................    3,600      104,850
     Interstate Bakeries Corporation........................    2,100       55,519
     Quaker Oats Company....................................    1,100       65,450
                                                                        ----------
                                                                           511,969
                                                                        ----------
  GAS & PIPELINE UTILITIES -- 0.9%
     Coastal Corporation....................................    4,100      143,244
                                                                        ----------
  HOTELS & RESTAURANTS -- 1.3%
     Tricon Global Restaurants Incorporated(a)..............    4,100      205,513
                                                                        ----------
  HOUSEHOLD PRODUCTS -- 2.1%
     Premark International Incorporated.....................    3,900      135,038
     Procter & Gamble Company...............................    2,100      191,756
                                                                        ----------
                                                                           326,794
                                                                        ----------
  INDUSTRIAL MACHINERY -- 0.1%
     Ingersoll Rand Company.................................      100        4,694
     Sundstrand Corporation.................................      100        5,187
                                                                        ----------
                                                                             9,881
                                                                        ----------
  INSURANCE -- 4.9%
     Allstate Corporation...................................    5,600      216,300
     American International Group Incorporated..............      800       77,300
     CIGNA Corporation......................................    2,900      224,206
     Everest Reinsurance Holdings Incorporated..............      200        7,788
     Loews Corporation......................................    2,300      225,975
     Old Republic International Corporation.................      150        3,375
     Travelers Property Casualty Corporation................      100        3,100
                                                                        ----------
                                                                           758,044
                                                                        ----------
  INTERNATIONAL OIL -- 2.4%
     Exxon Corporation......................................    3,900      285,187
     Mobil Corporation......................................    1,100       95,838
                                                                        ----------
                                                                           381,025
                                                                        ----------
  LEISURE TIME -- 0.8%
     Anchor Gaming(a).......................................      100        5,638
     Carnival Corporation...................................    2,400      115,200
                                                                        ----------
                                                                           120,838
                                                                        ----------
  LIQUOR -- 0.9%
     Anheuser Busch Companies Incorporated..................    2,200      144,375
                                                                        ----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-24
<PAGE>   120
                                AGA SERIES TRUST
              STATE STREET GLOBAL ADVISORS GROWTH EQUITY PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                          SHARES      VALUE
- --------------------                                          -------   ----------
<S>                                                           <C>       <C>
<->COMMON STOCKS -- (CONTINUED)
  MANUFACTURING -- 2.7%
     General Electric Company...............................    4,100   $  418,456
                                                                        ----------
  PAPER -- 0.2%
     Louisiana Pacific Corporation..........................    2,000       36,625
                                                                        ----------
  PETROLEUM SERVICES -- 0.9%
     ENSCO International Incorporated.......................      100        1,069
     Tidewater Incorporated.................................    5,800      134,487
                                                                        ----------
                                                                           135,556
                                                                        ----------
  PUBLISHING -- 1.0%
     Gannett Company Incorporated...........................      100        6,450
     Valassis Communications Incorporated(a)................    2,800      144,550
                                                                        ----------
                                                                           151,000
                                                                        ----------
  RAILROADS & EQUIPMENT -- 0.0%
     CSX Corporation........................................      100        4,150
                                                                        ----------
  RETAIL GROCERY -- 0.8%
     Kroger Company(a)......................................    2,000      121,000
                                                                        ----------
  RETAIL TRADE -- 9.8%
     Best Buy Company Incorporated(a).......................    3,300      202,799
     Dayton Hudson Corporation..............................    3,600      195,300
     Dillard's Incorporated.................................    5,000      141,875
     Home Depot Incorporated................................      600       36,713
     KMart Corporation(a)...................................   13,300      203,656
     May Department Stores Company..........................    3,100      187,162
     TJX Companies Incorporated.............................    5,900      171,100
     Wal Mart Stores Incorporated...........................    4,700      382,756
                                                                        ----------
                                                                         1,521,361
                                                                        ----------
  SOFTWARE -- 5.9%
     BMC Software Incorporated(a)...........................      100        4,456
     Microsoft Corporation(a)...............................    3,200      443,800
     Oracle Systems Corporation(a)..........................    7,900      340,688
     Sterling Software Incorporated(a)......................    4,800      129,900
                                                                        ----------
                                                                           918,844
                                                                        ----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-25
<PAGE>   121
                                AGA SERIES TRUST
              STATE STREET GLOBAL ADVISORS GROWTH EQUITY PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                          SHARES      VALUE
- --------------------                                          -------   ----------
<S>                                                           <C>       <C>
<->COMMON STOCKS -- (CONTINUED)
  TELECOMMUNICATIONS -- 10.8%
     AT&T Corporation.......................................    5,800   $  436,450
     Bell Atlantic Corporation..............................    4,920      260,760
     BellSouth Corporation..................................    4,100      204,487
     Cisco Systems Incorporated(a)..........................    1,250      116,016
     GTE Corporation........................................    1,000       65,000
     Lucent Technologies Incorporated.......................    1,200      132,000
     MCI WorldCom Incorporated(a)...........................    1,300       93,275
     SBC Communications Incorporated........................    3,276      175,676
     US West Incorporated...................................    2,900      187,412
                                                                        ----------
                                                                         1,671,076
                                                                        ----------
  TOBACCO -- 1.8%
     Philip Morris Companies Incorporated...................    5,300      283,550
                                                                        ----------
  TRANSPORTATION -- 0.4%
     Burlington Northern Santa Fe Corporation...............    1,700       57,375
                                                                        ----------
TOTAL COMMON STOCKS -- (Cost $12,536,879)...................            15,176,688
                                                                        ----------
</TABLE>
 
<TABLE>
<CAPTION>
                                                              PRINCIPAL
                                                               AMOUNT
                                                              ---------
<S>                                                           <C>         <C>
MUTUAL FUNDS -- 4.3%
     Dreyfus Cash Management Plus Fund......................  $664,989    $   664,989
     Waddell & Reed Financial Incorporated..................         5            118
     Waddell & Reed Financial Incorporated(a)...............        24            558
                                                                          -----------
TOTAL MUTUAL FUNDS -- (Cost $665,549).......................                  665,665
                                                                          -----------
TOTAL INVESTMENTS -- (COST $13,202,428*) -- 102.2%..........               15,842,353
                                                                          -----------
OTHER ASSETS LESS LIABILITIES -- (2.2)%.....................                 (342,596)
                                                                          -----------
NET ASSETS -- 100.0%........................................              $15,499,757
                                                                          ===========
</TABLE>
 
- ---------------
 
(a)  Non-income producing security
 
 *  Aggregate cost for Federal tax purposes is $13,224,838. Aggregate gross
    unrealized appreciation for all securities in which there is an excess of
    value over tax cost and aggregate gross unrealized depreciation for all
    securities in which there is an excess of tax cost over value were
    $2,832,710 and $215,195, respectively, resulting in net unrealized
    appreciation of $2,617,515.
 
    The accompanying notes are an integral part of the financial statements
                                      F-26
<PAGE>   122
 
                                AGA SERIES TRUST
              STATE STREET GLOBAL ADVISORS MONEY MARKET PORTFOLIO
 
                            SCHEDULE OF INVESTMENTS
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                              PRINCIPAL
SECURITY DESCRIPTION                                            AMOUNT       VALUE
- --------------------                                          ----------   ----------
<S>                                                           <C>          <C>
DISCOUNT NOTES -- 47.3%
  FEDERAL AGENCIES -- 47.3%
     Federal Farm Credit Bank
       4.83%, 02/26/1999**..................................  $   69,000   $   68,482
       4.97%, 05/20/1999**..................................      28,000       27,463
       5.25%, 01/14/1999**..................................     375,000      374,289
     Federal Home Loan Bank
       4.97%, 03/24/1999**..................................     217,000      214,544
       5.00%, 02/26/1999**..................................     300,000      297,667
       5.05%, 02/16/1999**..................................     100,000       99,355
       5.12%, 01/22/1999**..................................     250,000      249,253
       5.38%, 01/08/1999**..................................     250,000      249,914
     Federal Home Loan Mortgage
       4.80%, 05/12/1999**..................................     250,000      245,633
       4.95%, 04/06/1999**..................................     100,000       98,694
       5.00%, 02/05/1999**..................................     150,000      149,271
       5.00%, 02/12/1999**..................................     198,000      196,845
       5.05%, 02/25/1999**..................................     225,000      223,264
       5.20%, 02/25/1999**..................................     185,000      183,530
       5.45%, 02/03/1999**..................................     400,000      398,088
     Federal National Mortgage Association
       4.78%, 06/07/1999**..................................     115,000      112,603
       4.78%, 06/10/1999**..................................     160,000      156,601
       4.98%, 03/15/1999**..................................     250,000      247,475
       5.40%, 03/05/1999**..................................     442,000      437,823
       6.19%, 06/07/1999**..................................     345,000      346,711
                                                                           ----------
TOTAL DISCOUNT NOTES -- (Cost $4,377,505)...................                4,377,505
                                                                           ----------
COMMERCIAL PAPER -- 21.1%
  BROKERAGE -- 4.2%
     Morgan Stanley Group Incorporated
       5.42%, 01/20/1999....................................     235,000      235,033
     Salomon Smith Barney Holdings Incorporated
       5.48%, 02/09/1999**..................................     150,000      149,110
                                                                           ----------
                                                                              384,143
                                                                           ----------
  FINANCE -- 2.2%
     General Electric Capital Corporation
       5.03%, 01/22/1999**..................................     200,000      199,413
                                                                           ----------
  FINANCE & BANKING -- 1.1%
     Branch Banking & Trust Company
       6.20%, 09/15/1999....................................     100,000      100,543
                                                                           ----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-27
<PAGE>   123
                                AGA SERIES TRUST
       STATE STREET GLOBAL ADVISORS MONEY MARKET PORTFOLIO -- (CONTINUED)
 
                            SCHEDULE OF INVESTMENTS
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                              PRINCIPAL
SECURITY DESCRIPTION                                            AMOUNT       VALUE
- --------------------                                          ----------   ----------
<S>                                                           <C>          <C>
COMMERCIAL PAPER -- (CONTINUED)
  FINANCE CAPTIVE -- 1.1%
     General Motor Acceptance Corporation
       6.00%, 01/11/1999....................................  $  100,000   $  100,010
                                                                           ----------
  FINANCIAL SERVICES -- 7.5%
     ABN AMRO North America
       5.10%, 03/30/1999**..................................     300,000      296,260
     Ciesco LP
       5.30%, 01/13/1999**..................................     155,000      154,726
     PACCAR Financial Corporation
       5.05%, 03/18/1999**..................................     250,000      247,335
                                                                           ----------
                                                                              698,321
                                                                           ----------
  Insurance -- 5.0%
     Prudential Funding Corporation
       5.07%, 01/26/1999**..................................     200,000      199,296
     USAA Capital Corporation
       5.12%, 01/21/1999**..................................     268,000      267,237
                                                                           ----------
                                                                              466,533
                                                                           ----------
TOTAL COMMERCIAL PAPER -- (Cost $1,948,963).................                1,948,963
                                                                           ----------
REPURCHASE AGREEMENTS -- 32.6%
     Lehman Brothers Incorporated, 4.97% dated 12/31/1998 to
      be repurchased at $1,518,838 on 01/04/1999,
      collateralized by a $1,585,000 par value Federal
      National Mortgage Association Discount Note, 0.00% due
      06/16/1999, with a value of $1,548,360................   1,518,000    1,518,000
     Merrill Lynch & Company Incorporated, 5.20% dated
      12/31/1998 to be repurchased at $1,500,867 on
      01/04/1999, collateralized by a $1,500,000 par value
      Federal Farm Mortgage Note, 5.53% due 12/03/2008, with
      a value of $1,530,000.................................   1,500,000    1,500,000
                                                                           ----------
TOTAL REPURCHASE AGREEMENTS -- (Cost $3,018,000)............                3,018,000
                                                                           ----------
TOTAL INVESTMENTS -- (COST $9,344,468*) -- 101.0%...........                9,344,468
                                                                           ----------
OTHER ASSETS LESS LIABILITIES -- (1.0)%.....................                  (90,782)
                                                                           ----------
NET ASSETS -- 100.0%........................................               $9,253,686
                                                                           ----------
</TABLE>
 
- ---------------
 
 * Aggregate cost for Federal tax purposes is identical.
 
** The rate shown reflects the current yield at December 31, 1998.
 
    The accompanying notes are an integral part of the financial statements
                                      F-28
<PAGE>   124
 
                                AGA SERIES TRUST
                      VAN KAMPEN EMERGING GROWTH PORTFOLIO
 
                            SCHEDULE OF INVESTMENTS
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                            SHARES         VALUE
- --------------------                                          -----------   -----------
<S>                                                           <C>           <C>
COMMON STOCKS -- 95.6%
  ADVERTISING -- 1.7%
     Interpublic Group of Companies Incorporated............          850   $    67,787
     Omnicom Group Incorporated.............................        1,450        84,100
     Outdoor Systems Incorporated(a)........................        1,700        51,000
                                                                            -----------
                                                                                202,887
                                                                            -----------
  AEROSPACE -- 0.7%
     Gulfstream Aerospace Corporation(a)....................        1,550        82,538
                                                                            -----------
  AIR TRAVEL -- 0.6%
     Comair Holdings Incorporated...........................          750        25,312
     SouthWest Airlines Company.............................        1,750        39,266
                                                                            -----------
                                                                                 64,578
                                                                            -----------
  APPAREL & TEXTILES -- 0.2%
     Shaw Industries Incorporated...........................        1,000        24,250
                                                                            -----------
  AUTO PARTS -- 1.1%
     Danaher Corporation....................................        1,100        59,744
     Federal-Mogul Corporation..............................          850        50,575
     Gentex Corporation(a)..................................          650        13,000
                                                                            -----------
                                                                                123,319
                                                                            -----------
  BANKS -- 1.8%
     AmSouth Bancorporation.................................          475        21,672
     Fifth Third Bancorp....................................          475        33,873
     Firstar Corporation....................................          700        65,275
     National Commerce Bancorporation.......................          250         4,703
     Northern Trust Corporation.............................          650        56,753
     Zions Bancorp..........................................          500        31,188
                                                                            -----------
                                                                                213,464
                                                                            -----------
  BROADCASTING -- 5.1%
     Cablevision Systems Corporation(a).....................        1,400        70,263
     Chancellor Media Corporation(a)........................        3,850       184,319
     Clear Channel Communications Incorporated(a)...........        2,400       130,800
     Echostar Communications Corporation(a).................          750        36,281
     Jacor Communications Incorporated(a)...................        1,500        96,562
     Tele-Communications Liberty Media Group(a).............        1,700        78,306
                                                                            -----------
                                                                                596,531
                                                                            -----------
  BUILDING & RELATED -- 1.0%
     Kaufman & Broad Home Corporation.......................          400        11,500
     Lowe's Companies Incorporated..........................        1,950        99,816
                                                                            -----------
                                                                                111,316
                                                                            -----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-29
<PAGE>   125
                                AGA SERIES TRUST
                      VAN KAMPEN EMERGING GROWTH PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                            SHARES         VALUE
- --------------------                                          -----------   -----------
<S>                                                           <C>           <C>
COMMON STOCKS -- (CONTINUED)
  BUSINESS SERVICES -- 6.1%
     Affiliated Computer Services Incorporated(a)...........          450   $    20,250
     American Management Systems Incorporated(a)............          850        34,000
     Ciber Incorporated(a)..................................        1,100        30,731
     Concord EFS Incorporated(a)............................        1,550        65,681
     Consolidated Graphics Incorporated(a)..................          475        32,092
     CSG Systems International Incorporated(a)..............        1,100        86,900
     Education Management Corporation(a)....................          500        11,813
     Fiserv Incorporated(a).................................          650        33,434
     IMRglobal Corporation(a)...............................          800        23,550
     Keane Incorporated(a)..................................        1,100        43,931
     Lason Incorporated(a)..................................          300        17,456
     Mastech Corporation(a).................................          750        21,469
     MedQuist Incorporated(a)...............................          500        19,750
     Metzler Group Incorporated(a)..........................          750        36,516
     Network Solutions Incorporated(a)......................          300        39,263
     Paychex Incorporated...................................          750        38,578
     Robert Half International Incorporated(a)..............          750        33,516
     SEI Investments Company................................          250        24,844
     Snyder Communications Incorporated(a)..................          500        16,875
     SunGuard Data Systems Incorporated(a)..................        1,500        59,531
     Sykes Enterprises Incorporated(a)......................          650        19,825
                                                                            -----------
                                                                                710,005
                                                                            -----------
  CHEMICALS -- 0.6%
     Waters Corporation(a)..................................          800        69,800
                                                                            -----------
  COMPUTERS & BUSINESS EQUIPMENT -- 13.0%
     Apple Computer Incorporated(a).........................          800        32,750
     CDW Computer Centers Incorporated(a)...................          650        62,359
     Concord Communications Incorporated(a).................          400        22,700
     Dell Computer Corporation(a)...........................        6,696       490,063
     EMC Corporation(a).....................................        5,000       425,000
     Insight Enterprises Incorporated(a)....................          550        27,981
     International Network Services(a)......................          950        63,175
     Lexmark International Group Incorporated(a)............        1,600       160,800
     Network Appliance Incorporated(a)......................        2,800       126,000
     Symbol Technologies Incorporated.......................        1,000        63,938
     Verisign Incorporated(a)...............................          300        17,738
     Xircom Incorporated(a).................................          750        25,500
                                                                            -----------
                                                                              1,518,004
                                                                            -----------
  DRUGS & HEALTH CARE -- 11.3%
     Allegiance Corporation.................................        2,600       121,225
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-30
<PAGE>   126
                                AGA SERIES TRUST
                      VAN KAMPEN EMERGING GROWTH PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                            SHARES         VALUE
- --------------------                                          -----------   -----------
<S>                                                           <C>           <C>
COMMON STOCKS -- (CONTINUED)
     Allergan Incorporated..................................          750   $    48,563
     Amgen Incorporated(a)..................................          350        36,597
     Biogen Incorporated(a).................................        2,800       232,400
     Biomatrix Incorporated(a)..............................          450        26,213
     Biomet Incorporated....................................        1,000        40,250
     Cardinal Health Incorporated...........................          450        34,144
     Express Scripts Incorporated(a)........................          500        33,563
     Genzyme Corporation....................................        1,200        59,700
     Guidant Corporation....................................        1,100       121,275
     Henry Schein Incorporated(a)...........................          500        22,375
     Immunex Corporation(a).................................          600        75,487
     Medicis Pharmaceutical Corporation(a)..................          400        23,850
     MedImmune Incorporated(a)..............................          350        34,803
     Medtronic Incorporated.................................          700        51,975
     MiniMed Incorporated(a)................................          550        57,612
     Omnicare Incorporated..................................        1,450        50,387
     Pathogensis Corporation(a).............................          300        17,400
     Patterson Dental Company(a)............................          400        17,400
     PSS World Medical Incorporated(a)......................          300         6,900
     Quintiles Transnational Corporation(a).................        1,300        69,387
     VISX Incorporated(a)...................................          100         8,744
     Watson Pharmaceuticals Incorporated(a).................        1,600       100,600
     Wellpoint Health Networks Incorporated(a)..............          300        26,100
                                                                            -----------
                                                                              1,316,950
                                                                            -----------
  ELECTRICAL EQUIPMENT -- 0.8%
     American Power Conversion Corporation(a)...............        2,000        96,875
                                                                            -----------
  ELECTRONICS -- 6.0%
     Advanced Micro Devices Incorporated(a).................          750        21,703
     Altera Corporation(a)..................................        1,150        70,006
     Applied Micro Circuits Corporation(a)..................          400        13,587
     Cree Research Incorporated(a)..........................          300        14,362
     Eletronics For Imaging Incorporated(a).................          650        26,000
     Flextronics International Limited(a)...................          750        64,219
     Gemstar Group Limited(a)...............................        1,600        91,600
     Intel Corporation......................................          650        77,066
     Jabil Circuit Incorporated(a)..........................        1,150        85,819
     QLogic Corporation(a)..................................          250        32,719
     Sanmina Corporation(a).................................          300        18,750
     Solectron Corporation(a)...............................          700        65,056
     Texas Instruments Incorporated.........................          350        29,947
     Vitesse Semiconductor Corporation(a)...................        2,000        91,250
                                                                            -----------
                                                                                702,084
                                                                            -----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-31
<PAGE>   127
                                AGA SERIES TRUST
                      VAN KAMPEN EMERGING GROWTH PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                            SHARES         VALUE
- --------------------                                          -----------   -----------
<S>                                                           <C>           <C>
COMMON STOCKS -- (CONTINUED)
  FINANCIAL SERVICES -- 3.6%
     Capital One Financial Corporation......................        1,000   $   115,000
     Finova Group Incorporated..............................          600        32,363
     Metris Companies Incorporated..........................          100         5,031
     Old Kent Financial Corporation.........................          800        37,200
     Providian Financial Corporation........................        3,100       232,500
                                                                            -----------
                                                                                422,094
                                                                            -----------
  FOOD & BEVERAGES -- 0.8%
     Adolph Coors Company...................................          500        28,218
     Earthgrains Company....................................          900        27,844
     Smithfield Foods Incorporated(a).......................          400        13,550
     U.S. Foodservice(a)....................................          600        29,400
                                                                            -----------
                                                                                 99,012
                                                                            -----------
  HOMEBUILDERS -- 0.1%
     Pulte Corporation......................................          600        16,688
                                                                            -----------
  HOTELS & RESTAURANTS -- 0.6%
     Brinker International Incorporated(a)..................        1,100        31,763
     Tricon Global Restaurants Incorporated(a)..............          650        32,581
                                                                            -----------
                                                                                 64,344
                                                                            -----------
  HOUSEHOLD APPLIANCES & HOME FURNISHINGS -- 0.2%
     WestPoint Stevens Incorporated(a)......................          600        18,938
                                                                            -----------
  INDUSTRIAL MACHINERY -- 1.2%
     Tyco International Limited.............................        1,800       135,787
                                                                            -----------
  INSURANCE -- 0.5%
     Fidelity National Financial Incorporated...............          220         6,710
     Progressive Corporation................................          150        25,406
     Protective Life Corporation............................          600        23,888
                                                                            -----------
                                                                                 56,004
                                                                            -----------
  LEISURE TIME -- 0.1%
     Hollywood Entertainment Corporation(a).................          500        13,625
                                                                            -----------
  PETROLEUM SERVICES -- 0.2%
     Marine Drilling Companies Incorporated(a)..............        1,250         9,609
     National-Oilwell Incorporated(a).......................          600         6,713
     Veritas DGC Incorporated(a)............................          600         7,800
                                                                            -----------
                                                                                 24,122
                                                                            -----------
  POLLUTION CONTROL -- 0.6%
     Allied Waste Industries Incorporated(a)................        2,883        68,111
                                                                            -----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-32
<PAGE>   128
                                AGA SERIES TRUST
                      VAN KAMPEN EMERGING GROWTH PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                            SHARES         VALUE
- --------------------                                          -----------   -----------
<S>                                                           <C>           <C>
COMMON STOCKS -- (CONTINUED)
  PUBLISHING -- 0.7%
     Meredith Corporation...................................        1,050   $    39,769
     Valassis Communications Incorporated(a)................          850        43,881
                                                                            -----------
                                                                                 83,650
                                                                            -----------
  RETAIL GROCERY -- 0.9%
     Safeway Incorporated(a)................................        1,800       109,687
                                                                            -----------
  RETAIL TRADE -- 11.1%
     Abercrombie & Fitch Company(a).........................        1,600       113,200
     American Eagle Outfitters Incorporated(a)..............          200        13,325
     AnnTaylor Stores Corporation(a)........................        1,100        43,381
     Bed Bath & Beyond Incorporated(a)......................        1,250        42,656
     Best Buy Company Incorporated(a).......................        3,800       233,225
     Costco Companies Incorporated(a).......................          500        36,094
     CVS Corporation........................................        1,300        71,500
     Dollar Tree Stores Incorporated(a).....................        1,000        43,687
     Family Dollar Stores Incorporated......................        2,900        63,800
     Gap Incorporated.......................................        1,700        95,625
     Home Depot Incorporated................................        2,300       140,731
     Linens 'N Things Incorporated(a).......................        1,800        71,325
     Micro Warehouse Incorporated(a)........................          300        10,144
     Staples Incorporated(a)................................        3,250       141,984
     TJX Companies Incorporated.............................        3,800       110,200
     Trans World Entertainment Corporation(a)...............          650        12,391
     Williams-Sonoma Incorporated(a)........................        1,250        50,391
                                                                            -----------
                                                                              1,293,659
                                                                            -----------
  SAVINGS & LOAN -- 0.1%
     Dime Bancorp Incorporated..............................          625        16,523
                                                                            -----------
  SOFTWARE -- 20.6%
     America Online Incorporated............................        4,850       776,000
     BMC Software Incorporated(a)...........................        2,300       102,494
     Citrix Systems Incorporated(a).........................        1,600       155,300
     Compuware Corporation(a)...............................        5,500       429,687
     Comverse Technology Incorporated(a)....................          850        60,350
     EarthLink Network Incorporated(a)......................          750        42,750
     Legato Systems Incorporated(a).........................        2,150       141,766
     Macromedia Incorporated(a).............................        1,500        50,531
     Mercury Interactive Corporation(a).....................          700        44,275
     Microsoft Corporation(a)...............................          400        55,475
     MindSpring Enterprises Incorporated(a).................          800        48,850
     Network Associates Incorporated(a).....................          950        62,937
     New Era Of Networks Incorporated(a)....................          600        26,400
     Peregrine Systems Incorporated(a)......................          200         9,275
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-33
<PAGE>   129
                                AGA SERIES TRUST
                      VAN KAMPEN EMERGING GROWTH PORTFOLIO
 
                     SCHEDULE OF INVESTMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
SECURITY DESCRIPTION                                            SHARES         VALUE
- --------------------                                          -----------   -----------
<S>                                                           <C>           <C>
COMMON STOCKS -- (CONTINUED)
     Rational Software Corporation(a).......................        1,600   $    42,400
     Sterling Software Incorporated(a)......................        1,000        27,063
     Veritas Software Company(a)............................        1,550        92,903
     Wind River Systems(a)..................................          400        18,800
     Yahoo! Incorporated(a).................................          900       213,244
                                                                            -----------
                                                                              2,400,500
                                                                            -----------
  TELECOMMUNICATIONS -- 3.7%
     Cisco Systems Incorporated(a)..........................        1,450       134,578
     General Instrument Corporation(a)......................        1,200        40,725
     GeoTel Communications Corporation(a)...................          600        22,350
     Gilat Satellite Networks Limited(a)....................          400        22,050
     Global Crossing Limited(a).............................          500        22,563
     Metromedia Fiber Network Incorporated(a)...............        2,500        83,750
     Nokia Oyj..............................................          700        84,306
     Tekelec(a).............................................        1,150        19,047
                                                                            -----------
                                                                                429,369
                                                                            -----------
  TELEPHONE -- 0.6%
     Century Telephone Enterprises Incorporated.............        1,000        67,500
                                                                            -----------
TOTAL COMMON STOCKS -- (Cost $7,284,563)....................                 11,152,214
                                                                            -----------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                AMOUNT
                                                              -----------
<S>                                                           <C>           <C>
REPURCHASE AGREEMENT -- 9.2%
(Cost $1,077,000)
  State Street Bank and Trust Company, 4.85% dated
     12/31/1998, to be repurchased at $1,077,580 on
     01/04/1999, collateralized by a $1,050,000 par value
     U.S. Treasury Note, 5.75% due 04/30/2003, with a value
     of $1,103,158..........................................  $ 1,077,000   $ 1,077,000
                                                                            -----------
TOTAL INVESTMENTS -- (COST $8,361,563*) -- 104.8%...........                 12,229,214
                                                                            -----------
OTHER ASSETS LESS LIABILITIES -- (4.8)%.....................                   (555,182)
                                                                            -----------
NET ASSETS -- 100.0%........................................                $11,674,032
                                                                            ===========
</TABLE>
 
- ---------------
 
(a) Non-income producing security
 
 *  Aggregate cost for Federal tax purposes is $8,371,985. Aggregate gross
    unrealized appreciation for all securities in which there is an excess of
    value over tax cost and aggregate gross unrealized depreciation for all
    securities in which there is an excess of tax cost over value were
    $3,933,795 and $76,566, respectively, resulting in net unrealized
    appreciation of $3,857,229.
 
    The accompanying notes are an integral part of the financial statements
                                      F-34
<PAGE>   130
 
                                AGA SERIES TRUST
 
                      STATEMENT OF ASSETS AND LIABILITIES
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                CREDIT                                      SALOMON
                                                SUISSE         CREDIT                      BROTHERS
                                                GROWTH         SUISSE                        U.S.
                                                  AND       INTERNATIONAL                 GOVERNMENT
                                                INCOME         EQUITY       ELITEVALUE    SECURITIES
                                              -----------   -------------   -----------   -----------
<S>                                           <C>           <C>             <C>           <C>
ASSETS
  Investments in securities, at value.......  $14,526,595    $5,487,080     $20,615,672   $ 6,950,099
  Repurchase agreements, at value...........    4,784,000       529,000              --     4,375,000
                                              -----------    ----------     -----------   -----------
  Total Investments(a) (Note 1).............   19,310,595     6,016,080      20,615,672    11,325,099
  Cash, including foreign currency, at
     value..................................        3,467        46,222           2,089         1,086
  Receivable for securities sold............    2,861,735            --          41,917            --
  Interest receivable.......................       46,371            57              --        40,163
  Dividends receivable......................        7,127        13,426          14,949            --
  Receivable for fund shares sold...........       39,078        15,430          45,078        16,855
  Receivable due from adviser (Note 2)......       11,067        12,470           7,656         9,095
  Prepaid insurance.........................        3,008         3,008           3,008         3,008
                                              -----------    ----------     -----------   -----------
          TOTAL ASSETS......................   22,282,448     6,106,693      20,730,369    11,395,306
 
LIABILITIES
  Payable for securities purchased..........    5,454,613            --              --     2,651,790
  Payable for fund shares repurchased.......       27,898         3,761          31,989         5,982
  Payable for forward contracts (Note 5)....           --        31,761              --            --
  Payable for futures variation margin......           78            --              --            --
  Accounts payable and accrued expenses.....       86,733        75,213          78,450        58,341
                                              -----------    ----------     -----------   -----------
          TOTAL LIABILITIES.................    5,569,322       110,735         110,439     2,716,113
                                              -----------    ----------     -----------   -----------
          NET ASSETS........................  $16,713,126    $5,995,958     $20,619,930   $ 8,679,193
                                              ===========    ==========     ===========   ===========
 
NET ASSETS CONSIST OF:
  Par value (Note 4)........................  $    12,028    $    5,863     $    13,792   $     8,481
  Paid-in capital (Note 4)..................   15,018,473     6,167,234      19,396,357     8,608,549
  Undistributed (distributions in excess of)
     net investment income..................         (632)       24,298             137           449
  Accumulated net realized gain (loss) on
     investments, futures, and foreign
     currency translations..................       71,501      (349,546)        (14,715)        3,032
  Net unrealized appreciation (depreciation)
     of:
     Investments............................    1,614,853       179,278       1,224,359        58,682
     Futures contracts......................       (3,097)           --              --            --
     Foreign currency.......................           --       (31,169)             --            --
                                              -----------    ----------     -----------   -----------
          NET ASSETS........................  $16,713,126    $5,995,958     $20,619,930   $ 8,679,193
                                              ===========    ==========     ===========   ===========
 
  Shares outstanding at end of period.......    1,202,821       586,308       1,379,156       848,130
  Net asset value per share.................  $     13.89    $    10.23     $     14.95   $     10.23
  (a) Investments in securities and
      repurchase agreements, at cost........  $17,695,742    $5,836,802     $19,391,313   $11,266,417
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-35
<PAGE>   131
 
                                AGA SERIES TRUST
 
                      STATEMENT OF ASSETS AND LIABILITIES
                               DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                            STATE        STATE
                                                           STREET        STREET
                                                           GLOBAL        GLOBAL         VAN
                                                          ADVISORS      ADVISORS      KAMPEN
                                                           GROWTH        MONEY       EMERGING
                                                           EQUITY        MARKET       GROWTH
                                                         -----------   ----------   -----------
<S>                                                      <C>           <C>          <C>
ASSETS
  Investments in securities, at value..................  $15,842,353   $6,326,468   $11,152,214
  Repurchase agreements, at value......................           --    3,018,000     1,077,000
                                                         -----------   ----------   -----------
  Total Investments(a) (Note 1)........................   15,842,353    9,344,468    12,229,214
  Cash, including foreign currency, at value...........       91,987          890           395
  Receivable for securities sold.......................      218,654           --        35,119
  Interest receivable..................................           --        8,477           145
  Dividends receivable.................................       13,026           --         1,455
  Receivable for fund shares sold......................       33,114       87,345        22,728
  Receivable due from adviser (Note 2).................       10,859        8,352        10,980
  Prepaid insurance....................................        3,008        3,008         3,008
                                                         -----------   ----------   -----------
          TOTAL ASSETS.................................   16,213,001    9,452,540    12,303,044
 
LIABILITIES
  Payable for securities purchased.....................      619,478           --       539,507
  Payable for fund shares repurchased..................       13,006      142,597        11,906
  Accounts payable and accrued expenses................       80,760       56,257        77,599
                                                         -----------   ----------   -----------
          TOTAL LIABILITIES............................      713,244      198,854       629,012
                                                         -----------   ----------   -----------
          NET ASSETS...................................  $15,499,757   $9,253,686   $11,674,032
                                                         ===========   ==========   ===========
 
NET ASSETS CONSIST OF:
  Par value (Note 4)...................................  $     9,354   $   92,537   $     6,127
  Paid-in capital (Note 4).............................   12,664,889    9,161,149     8,149,844
  Undistributed net investment income..................            4           --            --
  Accumulated net realized gain (loss) on investments
     and foreign currency translations.................      185,585           --      (349,590)
  Net unrealized appreciation of:
     Investments.......................................    2,639,925           --     3,867,651
                                                         -----------   ----------   -----------
          NET ASSETS...................................  $15,499,757   $9,253,686   $11,674,032
                                                         ===========   ==========   ===========
 
  Shares outstanding at end of period..................      935,256    9,253,686       612,682
  Net asset value per share............................  $     16.57   $     1.00   $     19.05
  (a) Investments in securities and repurchase
      agreements, at cost..............................  $13,202,428   $9,344,468   $ 8,361,563
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-36
<PAGE>   132
 
                                AGA SERIES TRUST
 
                            STATEMENT OF OPERATIONS
                      FOR THE YEAR ENDED DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                  CREDIT                                   SALOMON
                                                  SUISSE        CREDIT                     BROTHERS
                                                  GROWTH        SUISSE                       U.S.
                                                   AND       INTERNATIONAL                GOVERNMENT
                                                  INCOME        EQUITY       ELITEVALUE   SECURITIES
                                                ----------   -------------   ----------   ----------
<S>                                             <C>          <C>             <C>          <C>
INVESTMENT INCOME
  Interest income.............................  $  282,660     $   9,975     $ 151,143    $ 325,319
  Dividend income**...........................      56,741        65,308       198,089           --
                                                ----------     ---------     ---------    ---------
          TOTAL INVESTMENT INCOME.............     339,401        75,283       349,232      325,319
 
EXPENSES
  Investment advisory fees (Note 2)...........      27,886        12,782        36,103       13,661
  Investment sub-advisory fees (Note 2).......      55,771        33,237        57,765       12,295
  Sub-administration fees.....................      53,600        53,600        53,600       53,600
  Audit fees..................................      12,600        13,150        13,675       10,763
  Custodian fees and expenses.................      61,720        67,358        28,783       30,818
  Trustee's fees (Note 2).....................       6,351         6,351         6,351        6,351
  Transfer agent fees.........................       4,181         4,147         4,642        4,191
  Insurance expense...........................       4,014         4,014         4,014        4,014
  Registration and filing fees................           3             3             3            3
  Miscellaneous expenses......................         180           180           180          234
                                                ----------     ---------     ---------    ---------
          Total operating expenses before
            waivers and reimbursements........     226,306       194,822       205,116      135,930
  Fees waived and expenses reimbursed (Note
     2).......................................    (136,257)     (146,508)     (103,149)    (107,001)
                                                ----------     ---------     ---------    ---------
          NET EXPENSES........................      90,049        48,314       101,967       28,929
                                                ----------     ---------     ---------    ---------
          NET INVESTMENT INCOME...............     249,352        26,969       247,265      296,390
                                                ----------     ---------     ---------    ---------
 
NET REALIZED AND UNREALIZED GAIN (LOSS) FROM
  INVESTMENTS AND FOREIGN CURRENCY
  Net realized gain (loss) on:
     Investments and futures contracts........     422,709      (335,423)      198,448       65,391
     Foreign currency transactions............          --       (14,341)           --           --
  Net change in unrealized appreciation
     (depreciation) of:
     Investments..............................     868,206       319,494       293,534       21,558
     Futures contracts........................      (3,097)           --            --           --
     Foreign currency.........................          --       (41,527)           --           --
                                                ----------     ---------     ---------    ---------
          NET REALIZED AND UNREALIZED GAIN
            (LOSS)............................   1,287,818       (71,797)      491,982       86,949
                                                ----------     ---------     ---------    ---------
 
NET INCREASE (DECREASE) IN NET ASSETS
  RESULTING FROM OPERATIONS...................  $1,537,170     $ (44,828)    $ 739,247    $ 383,339
                                                ==========     =========     =========    =========
  ** Net of foreign withholding taxes of......  $      396     $  12,429     $     290    $      --
                                                ==========     =========     =========    =========
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-37
<PAGE>   133
 
                                AGA SERIES TRUST
 
                            STATEMENT OF OPERATIONS
                      FOR THE YEAR ENDED DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                             STATE        STATE
                                                             STREET      STREET
                                                             GLOBAL      GLOBAL        VAN
                                                            ADVISORS    ADVISORS      KAMPEN
                                                             GROWTH       MONEY      EMERGING
                                                             EQUITY      MARKET       GROWTH
                                                           ----------   ---------   ----------
<S>                                                        <C>          <C>         <C>
INVESTMENT INCOME
  Interest income........................................  $    2,454   $ 301,805   $   29,230
  Dividend income........................................     159,043          --       13,910
                                                           ----------   ---------   ----------
          TOTAL INVESTMENT INCOME........................     161,497     301,805       43,140
 
EXPENSES
  Investment advisory fees (Note 2)......................      26,185      13,464       18,923
  Investment sub-advisory fees (Note 2)..................      37,706      10,779       37,847
  Sub-administration fees................................      53,600      53,600       53,600
  Audit fees.............................................      13,675      10,394       12,100
  Custodian fees and expenses............................      61,172      30,183       63,559
  Trustee's fees (Note 2)................................       6,351       6,351        6,351
  Transfer agent fees....................................       4,132       4,143        4,099
  Insurance expense......................................       4,014       4,014        4,014
  Registration and filing fee............................           3           3            3
  Miscellaneous expenses.................................         122         180          180
                                                           ----------   ---------   ----------
          Total operating expenses before waivers and
            reimbursements...............................     206,960     133,111      200,676
  Fees waived and expenses reimbursed (Note 2)...........    (137,450)   (106,873)    (140,046)
                                                           ----------   ---------   ----------
          NET EXPENSES...................................      69,510      26,238       60,630
                                                           ----------   ---------   ----------
          NET INVESTMENT INCOME (LOSS)...................      91,987     275,567      (17,490)
                                                           ----------   ---------   ----------
 
NET REALIZED AND UNREALIZED GAIN (LOSS) FROM INVESTMENTS
  AND FOREIGN CURRENCY
  Net realized gain (loss) on:
     Investments.........................................     557,763          --     (187,014)
  Net change in unrealized appreciation of:
     Investments.........................................   1,554,162          --    3,018,535
                                                           ----------   ---------   ----------
          NET REALIZED AND UNREALIZED GAIN...............   2,111,925          --    2,831,521
                                                           ----------   ---------   ----------
 
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS.....  $2,203,912   $ 275,567   $2,814,031
                                                           ==========   =========   ==========
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-38
<PAGE>   134
 
                                AGA SERIES TRUST
 
                      STATEMENTS OF CHANGES IN NET ASSETS
                 FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997
 
<TABLE>
<CAPTION>
                                                 CREDIT SUISSE                 CREDIT SUISSE
                                               GROWTH AND INCOME           INTERNATIONAL EQUITY               ELITEVALUE
                                          ---------------------------   ---------------------------   ---------------------------
                                              YEAR           YEAR           YEAR           YEAR           YEAR           YEAR
                                             ENDED          ENDED          ENDED          ENDED          ENDED          ENDED
                                          DECEMBER 31,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                              1998           1997           1998           1997           1998           1997
                                          ------------   ------------   ------------   ------------   ------------   ------------
<S>                                       <C>            <C>            <C>            <C>            <C>            <C>
INCREASE (DECREASE) IN NET ASSETS
  From operations:
    Net investment income...............  $   249,352     $  140,680     $   26,969     $   25,979    $   247,265    $    86,775
    Net realized gain (loss) on:
      Investments and futures
        contracts.......................      422,709        295,529       (335,423)       258,493        198,448        201,702
      Foreign currency transactions.....           --             --        (14,341)        (7,339)            --             --
    Net change in unrealized
      appreciation (depreciation) of:
      Investments.......................      868,206        522,340        319,494       (239,805)       293,534        621,441
      Future contracts..................       (3,097)            --             --             --             --             --
      Foreign currency..................           --             --        (41,527)       (11,172)            --             --
                                          -----------     ----------     ----------     ----------    -----------    -----------
        Net increase (decrease) in net
          assets resulting from
          operations....................    1,537,170        958,549        (44,828)        26,156        739,247        909,918
    Distributions to shareholders (Note
      1):
      From net investment income........     (251,869)      (139,024)       (15,131)       (44,337)      (247,142)       (86,761)
      In excess of net investment
        income..........................           --             --         (1,293)       (81,524)            --             --
      From net realized gains...........     (392,447)      (237,747)            --       (174,639)      (201,075)      (213,790)
      Fund share transactions (Note
        4)..............................    8,432,304      3,661,091      1,746,993      1,857,579     10,858,279      6,554,216
                                          -----------     ----------     ----------     ----------    -----------    -----------
        Total increase in net assets....    9,325,158      4,242,869      1,685,741      1,583,235     11,149,309      7,163,583
 
NET ASSETS:
  Beginning of period...................    7,387,968      3,145,099      4,310,217      2,726,982      9,470,621      2,307,038
                                          -----------     ----------     ----------     ----------    -----------    -----------
  End of period(a)......................  $16,713,126     $7,387,968     $5,995,958     $4,310,217    $20,619,930    $ 9,470,621
                                          ===========     ==========     ==========     ==========    ===========    ===========
  (a) Including undistributed
      (distributions in excess) net
      investment income.................  $      (632)    $    2,697     $   24,298     $  (11,838)   $       137    $        14
                                          ===========     ==========     ==========     ==========    ===========    ===========
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-39
<PAGE>   135
 
                                AGA SERIES TRUST
 
                      STATEMENTS OF CHANGES IN NET ASSETS
                 FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997
 
<TABLE>
<CAPTION>
                                             SALOMON BROTHERS U.S.          STATE STREET GLOBAL           STATE STREET GLOBAL
                                             GOVERNMENT SECURITIES        ADVISORS GROWTH EQUITY         ADVISORS MONEY MARKET
                                          ---------------------------   ---------------------------   ---------------------------
                                              YEAR           YEAR           YEAR           YEAR           YEAR           YEAR
                                             ENDED          ENDED          ENDED          ENDED          ENDED          ENDED
                                          DECEMBER 31,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                              1998           1997           1998           1997           1998           1997
                                          ------------   ------------   ------------   ------------   ------------   ------------
<S>                                       <C>            <C>            <C>            <C>            <C>            <C>
INCREASE (DECREASE) IN NET ASSETS
  From operations:
    Net investment income...............   $  296,390     $  159,857    $    91,987     $   69,786     $  275,567     $  159,789
    Net realized gain on:
      Investments.......................       65,391         23,149        557,763        622,295             --             --
    Net change in unrealized
      appreciation of investments.......       21,558         38,894      1,554,162        676,633             --             --
                                           ----------     ----------    -----------     ----------     ----------     ----------
        Net increase in net assets
          resulting from operations.....      383,339        221,900      2,203,912      1,368,714        275,567        159,789
    Distributions to shareholders (Note
      1):
      From net investment income........     (309,413)      (160,062)       (91,978)       (69,791)      (275,567)      (159,789)
      From net realized gains...........      (32,231)            --       (357,781)      (636,692)            --             --
      Fund share transactions (Note
        4)..............................    4,651,600      1,577,343      6,418,498      3,244,409      4,153,422      3,809,240
                                           ----------     ----------    -----------     ----------     ----------     ----------
        Total increase in net assets....    4,693,295      1,639,181      8,172,651      3,906,640      4,153,422      3,809,240
 
NET ASSETS:
  Beginning of period...................    3,985,898      2,346,717      7,327,106      3,420,466      5,100,264      1,291,024
                                           ----------     ----------    -----------     ----------     ----------     ----------
  End of period(a)......................   $8,679,193     $3,985,898    $15,499,757     $7,327,106     $9,253,686     $5,100,264
                                           ==========     ==========    ===========     ==========     ==========     ==========
  (a) Including undistributed net
      investment income.................   $      449     $      139    $         4     $       --     $       --     $       --
                                           ==========     ==========    ===========     ==========     ==========     ==========
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-40
<PAGE>   136
 
                                AGA SERIES TRUST
 
                      STATEMENTS OF CHANGES IN NET ASSETS
                 FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997
 
<TABLE>
<CAPTION>
                                                                      VAN KAMPEN
                                                                    EMERGING GROWTH
                                                              ---------------------------
                                                                  YEAR           YEAR
                                                                 ENDED          ENDED
                                                              DECEMBER 31,   DECEMBER 31,
                                                                  1998           1997
                                                              ------------   ------------
<S>                                                           <C>            <C>
INCREASE (DECREASE) IN NET ASSETS
  From operations:
    Net investment income (loss)............................  $   (17,490)   $     8,180
    Net realized loss on:
      Investments...........................................     (187,014)      (102,237)
    Net change in unrealized appreciation of Investments....    3,018,535        704,593
                                                              -----------    -----------
      Net increase in net assets resulting from
       operations...........................................    2,814,031        610,536
    Distributions to shareholders (Note 1):
      From net investment income............................         (481)        (7,882)
      Fund share transactions (Note 4)......................    3,361,948      3,014,043
                                                              -----------    -----------
        Total increase in net assets........................    6,175,497      3,616,697
 
NET ASSETS:
  Beginning of period.......................................    5,498,534      1,881,837
                                                              -----------    -----------
  End of period(a)..........................................  $11,674,032    $ 5,498,534
                                                              ===========    ===========
  (a) Including undistributed net investment income.........  $        --    $       298
                                                              ===========    ===========
</TABLE>
 
    The accompanying notes are an integral part of the financial statements
                                      F-41
<PAGE>   137
 
                                AGA SERIES TRUST
 
                              FINANCIAL HIGHLIGHTS
                 FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD
 
<TABLE>
<CAPTION>
                                                             CREDIT SUISSE GROWTH AND INCOME
                                                ---------------------------------------------------------
                                                    YEAR           YEAR           YEAR          PERIOD
                                                   ENDED          ENDED          ENDED          ENDED
                                                DECEMBER 31,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                                    1998           1997           1996          1995*
                                                ------------   ------------   ------------   ------------
<S>                                             <C>            <C>            <C>            <C>
NET ASSET VALUE
Net asset value, beginning of period..........    $ 12.72         $11.04         $10.46         $10.00
                                                  -------         ------         ------         ------
INVESTMENT OPERATIONS
Net investment income(1)......................       0.27           0.33           0.47           0.14
Net realized and unrealized gain..............       1.52           2.11           0.96           0.51
                                                  -------         ------         ------         ------
Total from investment operations..............       1.79           2.44           1.43           0.65
                                                  -------         ------         ------         ------
DISTRIBUTIONS TO SHAREHOLDERS FROM:
Net investment income.........................      (0.28)         (0.33)         (0.47)         (0.14)
Net realized gains............................      (0.34)         (0.43)         (0.38)            --
In excess of net realized gains...............         --             --             --          (0.05)
                                                  -------         ------         ------         ------
Total distributions to shareholders...........      (0.62)         (0.76)         (0.85)         (0.19)
                                                  -------         ------         ------         ------
Net asset value, end of period................    $ 13.89         $12.72         $11.04         $10.46
                                                  =======         ======         ======         ======
TOTAL RETURN..................................      14.16%         22.33%         13.82%          6.57%(2)
RATIOS AND SUPPLEMENTAL DATA
Expenses to average net assets(3).............       0.81%          0.62%          0.49%          0.12%(4)
Net investment income to average net assets...       3.04%          2.87%          4.65%          6.99%(4)
Portfolio turnover rate.......................        151%           191%           217%            75%
Net assets, end of period (000's).............    $16,713         $7,388         $3,145         $2,136
</TABLE>
 
- ---------------
 
 *  The Credit Suisse Growth and Income Portfolio commenced operations on
    October 20, 1995.
 
(1) Net investment income is after waiver of fees and reimbursement of certain
    expenses by the Investment Adviser, the Sub-administrator and American
    General Annuity Insurance Company, an affiliate of the Adviser (see Note 2
    to the financial statements). If the Investment Adviser and the
    Sub-administrator had not waived fees and American General Annuity Insurance
    Company had not reimbursed expenses for the periods ended December 31, 1998,
    December 31, 1997, December 31, 1996, and December 31, 1995, net investment
    income (loss) per share would have been $0.16, $0.10, $0.00 and $(0.06),
    respectively, for the Credit Suisse Growth and Income Portfolio.
 
(2) Total return represents aggregate total return for the period indicated and
    is not annualized.
 
(3) If the Investment Adviser and the Sub-administrator had not waived fees and
    American General Annuity Insurance Company had not reimbursed expenses for
    the periods ended December 31, 1998, December 31, 1997, December 31, 1996,
    and December 31, 1995, the ratio of operating expenses to average net assets
    would have been 2.01%, 3.26%, 5.15% and 9.95%, respectively, for the Credit
    Suisse Growth and Income Portfolio.
 
(4) Annualized.
 
    The accompanying notes are an integral part of the financial statements
                                      F-42
<PAGE>   138
 
                                AGA SERIES TRUST
 
                              FINANCIAL HIGHLIGHTS
                 FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD
 
<TABLE>
<CAPTION>
                                                           CREDIT SUISSE INTERNATIONAL EQUITY
                                                ---------------------------------------------------------
                                                    YEAR           YEAR           YEAR          PERIOD
                                                   ENDED          ENDED          ENDED          ENDED
                                                DECEMBER 31,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                                    1998           1997           1996          1995*
                                                ------------   ------------   ------------   ------------
<S>                                             <C>            <C>            <C>            <C>
NET ASSET VALUE
Net asset value, beginning of period..........     $10.35         $10.67         $10.33         $10.00
                                                   ------         ------         ------         ------
INVESTMENT OPERATIONS
Net investment income(1)......................       0.06           0.08           0.15           0.06
Net realized and unrealized gain (loss).......      (0.15)          0.37           1.56           0.33
                                                   ------         ------         ------         ------
Total from investment operations..............      (0.09)          0.45           1.71           0.39
                                                   ------         ------         ------         ------
DISTRIBUTIONS TO SHAREHOLDERS FROM:
Net investment income.........................      (0.03)         (0.12)         (0.15)         (0.06)
In excess of net investment income............         --          (0.20)            --             --
Net realized gains............................         --          (0.45)         (0.24)            --
In excess of net realized gains...............         --             --          (0.98)            --
                                                   ------         ------         ------         ------
Total distributions to shareholders...........      (0.03)         (0.77)         (1.37)         (0.06)
                                                   ------         ------         ------         ------
Net asset value, end of period................     $10.23         $10.35         $10.67         $10.33
                                                   ======         ======         ======         ======
TOTAL RETURN..................................      (0.86)%         4.30%         16.50%          3.93%(2)
RATIOS AND SUPPLEMENTAL DATA
Expenses to average net assets(3).............       0.94%          0.77%          0.60%          0.12%(4)
Net investment income to average net assets...       0.53%          0.71%          1.09%          2.89%(4)
Portfolio turnover rate.......................         61%             6%            79%             2%
Net assets, end of period (000's).............     $5,996         $4,310         $2,727         $2,083
</TABLE>
 
- ---------------
 
 *  The Credit Suisse International Equity Portfolio commenced operations on
    October 20, 1995.
 
(1) Net investment income is after waiver of fees and reimbursement of certain
    expenses by the Investment Adviser, the Sub-administrator and American
    General Annuity Insurance Company, an affiliate of the Adviser (see Note 2
    to the financial statements). If the Investment Adviser and the
    Sub-administrator had not waived fees and American General Annuity Insurance
    Company had not reimbursed expenses for the periods ended December 31, 1998,
    December 31, 1997, December 31, 1996, and December 31, 1995, net investment
    loss per share would have been $(0.19), $(0.29), $(1.25) and $(0.18),
    respectively, for the Credit Suisse International Equity Portfolio.
 
(2) Total return represents aggregate total return for the period indicated and
    is not annualized.
 
(3) If the Investment Adviser and the Sub-administrator had not waived fees and
    American General Annuity Insurance Company had not reimbursed expenses for
    the periods ended December 31, 1998, December 31, 1997, December 31, 1996,
    and December 31, 1995, the ratio of operating expenses to average net assets
    would have been 3.78%, 5.06%, 6.41% and 11.83%, respectively, for the Credit
    Suisse International Equity Portfolio.
 
(4) Annualized.
 
    The accompanying notes are an integral part of the financial statements
                                      F-43
<PAGE>   139
 
                                AGA SERIES TRUST
 
                              FINANCIAL HIGHLIGHTS
                 FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD
 
<TABLE>
<CAPTION>
                                                                           ELITEVALUE
                                                           ------------------------------------------
                                                               YEAR           YEAR          PERIOD
                                                              ENDED          ENDED          ENDED
                                                           DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                                               1998           1997          1996*
                                                           ------------   ------------   ------------
<S>                                                        <C>            <C>            <C>
NET ASSET VALUE
Net asset value, beginning of period.....................    $ 14.38         $12.32         $10.00
                                                             -------         ------         ------
INVESTMENT OPERATIONS
Net investment income(1).................................       0.25           0.19           0.18
Net realized and unrealized gain.........................       0.72           2.39           2.48
                                                             -------         ------         ------
Total from investment operations.........................       0.97           2.58           2.66
                                                             -------         ------         ------
DISTRIBUTIONS TO SHAREHOLDERS FROM:
Net investment loss......................................      (0.25)         (0.19)         (0.18)
Net realized gains.......................................      (0.15)         (0.33)         (0.16)
                                                             -------         ------         ------
Total distributions to shareholders......................      (0.40)         (0.52)         (0.34)
                                                             -------         ------         ------
Net asset value, end of period...........................    $ 14.95         $14.38         $12.32
                                                             =======         ======         ======
TOTAL RETURN.............................................       6.72%         21.08%         26.70%(2)
RATIOS AND SUPPLEMENTAL DATA
Expenses to average net assets(3)........................       0.71%          0.52%          0.36%(4)
Net investment income to average net assets..............       2.42%          1.58%          1.74%(4)
Portfolio turnover rate..................................         39%            29%            21%
Net assets, end of period (000's)........................    $20,620         $9,471         $2,307
</TABLE>
 
- ---------------
 
 *  The EliteValue Portfolio commenced operations on January 2, 1996.
 
(1) Net investment income is after waiver of fees and reimbursement of certain
    expenses by the Investment Adviser, the Sub-administrator and American
    General Annuity Insurance Company, an affiliate of the Adviser (see Note 2
    to the financial statements). If the Investment Adviser and the
    Sub-administrator had not waived fees and American General Annuity Insurance
    Company had not reimbursed expenses for the periods ended December 31, 1998,
    December 31, 1997 and December 31, 1996, net investment income (loss) per
    share would have been $0.17, $0.00 and $(0.54), respectively, for the
    EliteValue Portfolio.
 
(2) Total return represents aggregate total return for the period indicated and
    is not annualized.
 
(3) If the Investment Adviser and the Sub-administrator had not waived fees and
    American General Annuity Insurance Company had not reimbursed expenses for
    the periods ended December 31, 1998, December 31, 1997 and December 31,
    1996, the ratio of operating expenses to average net assets would have been
    1.41%, 2.76% and 7.45%, respectively, for the EliteValue Portfolio.
 
(4) Annualized.
 
    The accompanying notes are an integral part of the financial statements
                                      F-44
<PAGE>   140
 
                                AGA SERIES TRUST
 
                              FINANCIAL HIGHLIGHTS
                 FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD
 
<TABLE>
<CAPTION>
                                                            SALOMON BROTHERS U.S. GOVERNMENT SECURITIES
                                                           ---------------------------------------------
                                                               YEAR            YEAR           PERIOD
                                                               ENDED           ENDED           ENDED
                                                           DECEMBER 31,    DECEMBER 31,    DECEMBER 31,
                                                               1998            1997            1996*
                                                           -------------   -------------   -------------
<S>                                                        <C>             <C>             <C>
NET ASSET VALUE
Net asset value, beginning of period.....................     $10.07          $ 9.79          $10.00
                                                              ------          ------          ------
INVESTMENT OPERATIONS
Net investment income(1).................................       0.52            0.57            0.53
Net realized and unrealized gain (loss)..................       0.22            0.28           (0.21)
                                                              ------          ------          ------
Total from investment operations.........................       0.74            0.85            0.32
                                                              ------          ------          ------
DISTRIBUTIONS TO SHAREHOLDERS FROM:
Net investment income....................................      (0.54)          (0.57)          (0.53)
Net realized gains.......................................      (0.04)             --              --
                                                              ------          ------          ------
Total distributions to shareholders......................      (0.58)          (0.57)          (0.53)
                                                              ------          ------          ------
Net asset value, end of period...........................     $10.23          $10.07          $ 9.79
                                                              ======          ======          ======
TOTAL RETURN.............................................       7.49%           8.89%           3.40%(2)
RATIOS AND SUPPLEMENTAL DATA
Expenses to average net assets(3)........................       0.53%           0.35%           0.22%(4)
Net investment income to average net assets..............       5.95%           6.25%           5.91%(4)
Portfolio turnover rate..................................         24%            615%            297%
Net assets, end of period (000's)........................     $8,679          $3,986          $2,347
</TABLE>
 
 *  The Salomon Brothers U.S. Government Securities Portfolio commenced
    operations on February 6, 1996.
 
(1) Net investment income is after waiver of fees and reimbursement of certain
    expenses by the Investment Adviser, the Sub-administrator and American
    General Annuity Insurance Company, an affiliate of the Adviser (see Note 2
    to the financial statements). If the Investment Adviser and the
    Sub-administrator had not waived fees and American General Annuity Insurance
    Company had not reimbursed expenses for the periods ended December 31, 1998,
    December 31, 1997, and December 31, 1996, net investment income per share
    would have been $0.40, $0.28 and $0.10, respectively, for the Salomon
    Brothers U.S. Government Securities Portfolio.
 
(2) Total return represents aggregate total return for the period indicated and
    is not annualized.
 
(3) If the Investment Adviser and the Sub-administrator had not waived fees and
    American General Annuity Insurance Company had not reimbursed expenses for
    the periods ended December 31, 1998, December 31, 1997, and December 31,
    1996, the ratio of operating expenses to average net assets would have been
    2.46%, 4.84% and 5.26%, respectively, for the Salomon Brothers U.S.
    Government Securities Portfolio.
 
(4) Annualized.
 
    The accompanying notes are an integral part of the financial statements
                                      F-45
<PAGE>   141
 
                                AGA SERIES TRUST
 
                              FINANCIAL HIGHLIGHTS
                 FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD
 
<TABLE>
<CAPTION>
                                                       STATE STREET GLOBAL ADVISORS GROWTH EQUITY
                                                ---------------------------------------------------------
                                                    YEAR           YEAR           YEAR          PERIOD
                                                   ENDED          ENDED          ENDED          ENDED
                                                DECEMBER 31,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                                    1998           1997           1996          1995*
                                                ------------   ------------   ------------   ------------
<S>                                             <C>            <C>            <C>            <C>
NET ASSET VALUE
Net asset value, beginning of period..........    $ 14.07         $11.85         $10.31         $10.00
                                                  -------         ------         ------         ------
INVESTMENT OPERATIONS
Net investment income(1)......................       0.13           0.17           0.20           0.05
Net realized and unrealized gain..............       2.89           3.56           1.99           0.31
                                                  -------         ------         ------         ------
Total from investment operations..............       3.02           3.73           2.19           0.36
                                                  -------         ------         ------         ------
DISTRIBUTIONS TO SHAREHOLDERS FROM:
Net investment income.........................      (0.13)         (0.17)         (0.20)         (0.05)
Net realized gains............................      (0.39)         (1.34)         (0.45)            --
                                                  -------         ------         ------         ------
Total distributions to shareholders...........      (0.52)         (1.51)         (0.65)         (0.05)
                                                  -------         ------         ------         ------
Net asset value, end of period................    $ 16.57         $14.07         $11.85         $10.31
                                                  =======         ======         ======         ======
TOTAL RETURN..................................      21.60%         31.67%         21.36%          3.57%(2)
RATIOS AND SUPPLEMENTAL DATA
Expenses to average net assets(3).............       0.66%          0.48%          0.39%          0.12%(4)
Net investment income to average net assets...       0.88%          1.34%          1.80%          2.46%(4)
Portfolio turnover rate.......................        140%           111%            89%             9%
Net assets, end of period (000's).............    $15,500         $7,327         $3,420         $2,073
</TABLE>
 
 *  The State Street Global Advisors Growth Equity Portfolio commenced
    operations on October 20, 1995.
 
(1) Net investment income is after waiver of fees and reimbursement of certain
    expenses by the Investment Adviser, the Sub-administrator and American
    General Annuity Insurance Company, an affiliate of the Adviser (see Note 2
    to the financial statements). If the Investment Adviser and the
    Sub-administrator had not waived fees and American General Annuity Insurance
    Company had not reimbursed expenses for the periods ended December 31, 1998,
    December 31, 1997, December 31,1996 and December 31, 1995, the net
    investment loss per share would have been $(0.02), $(0.11), $(0.29) and
    $(0.15), respectively, for the State Street Global Advisor Growth Equity
    Portfolio.
 
(2) Total return represents aggregate total return for the period indicated and
    is not annualized.
 
(3) If the Investment Adviser and the Sub-administrator had not waived fees and
    American General Annuity Insurance Company had not reimbursed expenses for
    the periods ended December 31, 1998, December 31, 1997, December 31, 1996
    and December 31, 1995, the ratio of operating expenses to average net assets
    would have been 1.96%, 3.29%, 4.83% and 9.94%, respectively, for the State
    Street Global Advisor Growth Equity Portfolio.
 
(4) Annualized.
 
    The accompanying notes are an integral part of the financial statements
                                      F-46
<PAGE>   142
 
                                AGA SERIES TRUST
 
                              FINANCIAL HIGHLIGHTS
                 FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD
 
<TABLE>
<CAPTION>
                                                        STATE STREET GLOBAL ADVISORS MONEY MARKET
                                                ---------------------------------------------------------
                                                    YEAR           YEAR           YEAR          PERIOD
                                                   ENDED          ENDED          ENDED          ENDED
                                                DECEMBER 31,   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                                    1998           1997           1996          1995*
                                                ------------   ------------   ------------   ------------
<S>                                             <C>            <C>            <C>            <C>
NET ASSET VALUE
Net asset value, beginning of period..........     $ 1.00         $ 1.00         $ 1.00         $ 1.00
                                                   ------         ------         ------         ------
INVESTMENT OPERATIONS
Net investment income(1)......................       0.05           0.05           0.05           0.01
                                                   ------         ------         ------         ------
Total from investment operations..............       0.05           0.05           0.05           0.01
                                                   ------         ------         ------         ------
DISTRIBUTIONS TO SHAREHOLDERS FROM:
Net investment income.........................      (0.05)         (0.05)         (0.05)         (0.01)
                                                   ------         ------         ------         ------
Total distributions to shareholders...........      (0.05)         (0.05)         (0.05)         (0.01)
                                                   ------         ------         ------         ------
Net asset value, end of period................     $ 1.00         $ 1.00         $ 1.00         $ 1.00
                                                   ======         ======         ======         ======
TOTAL RETURN..................................       5.23%          5.50%          5.19%          1.17%(2)
RATIOS AND SUPPLEMENTAL DATA
Expenses to average net assets(3).............       0.49%          0.32%          0.29%          0.12%(4)
Net investment income to average net assets...       5.12%          5.41%          5.23%          5.25%(4)
Net assets, end of period (000's).............     $9,254         $5,100         $1,291         $  126
</TABLE>
 
 *  The State Street Global Advisors Money Market Portfolio commenced operations
    on October 10, 1995.
 
(1) Net investment income is after waiver of fees and reimbursement of certain
    expenses by the Investment Adviser, the Sub-administrator and American
    General Annuity Insurance Company, an affiliate of the Adviser (see Note 2
    to the financial statements). If the Investment Adviser and the
    Sub-administrator had not waived fees and American General Annuity Insurance
    Company had not reimbursed expenses for the periods ended December 31, 1998,
    December 31, 1997, December 31, 1996, and December 31, 1995, net investment
    income (loss) per share would have been $0.04, $0.03, $(0.08) and $(0.35),
    respectively, for the State Street Global Advisors Money Market Portfolio.
 
(2) Total return represents aggregate total return for the period indicated and
    is not annualized.
 
(3) If the Investment Adviser and the Sub-administrator had not waived fees and
    American General Annuity Insurance Company had not reimbursed expenses for
    the periods ended December 31, 1998, December 31, 1997, December 31, 1996,
    and December 31, 1995, the ratio of operating expenses to average net assets
    would have been 2.44%, 4.17%, 14.15% and 161.83%, respectively, for the
    State Street Global Advisors Money Market Portfolio.
 
(4) Annualized.
 
    The accompanying notes are an integral part of the financial statements
                                      F-47
<PAGE>   143
 
                                AGA SERIES TRUST
 
                              FINANCIAL HIGHLIGHTS
                 FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD
 
<TABLE>
<CAPTION>
                                                                   VAN KAMPEN EMERGING GROWTH
                                                           ------------------------------------------
                                                               YEAR           YEAR          PERIOD
                                                              ENDED          ENDED          ENDED
                                                           DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                                               1998           1997          1996*
                                                           ------------   ------------   ------------
<S>                                                        <C>            <C>            <C>
NET ASSET VALUE
Net asset value, beginning of period.....................    $ 13.87         $11.54         $10.00
                                                             -------         ------         ------
INVESTMENT OPERATIONS
Net investment income (loss)(1)..........................      (0.03)          0.03           0.05
Net realized and unrealized gain.........................       5.21           2.33           1.86
                                                             -------         ------         ------
Total from investment operations.........................       5.18           2.36           1.91
                                                             -------         ------         ------
DISTRIBUTIONS TO SHAREHOLDERS FROM:
Net investment income....................................         --          (0.03)         (0.05)
Net realized gains.......................................         --             --          (0.32)
                                                             -------         ------         ------
Total distributions to shareholders......................         --          (0.03)         (0.37)
                                                             -------         ------         ------
Net asset value, end of period...........................    $ 19.05         $13.87         $11.54
                                                             =======         ======         ======
TOTAL RETURN.............................................      37.43%         20.45%         19.06%(2)
RATIOS AND SUPPLEMENTAL DATA
Expenses to average net assets(3)........................       0.80%          0.62%          0.46%(4)
Net investment income (loss) to average net assets.......      (0.57)%         0.23%          0.40%(4)
Portfolio turnover rate..................................        107%           107%           154%
Net assets, end of period (000's)........................    $11,674         $5,499         $1,882
</TABLE>
 
 *  The Van Kampen Emerging Growth Portfolio commenced operations on January 2,
    1996.
 
(1) Net investment income is after waiver of fees and reimbursement of certain
    expenses by the Investment Adviser, the Sub-administrator and American
    General Annuity Insurance Company, an affiliate of the Adviser (see Note 2
    to the financial statements). If the Investment Adviser and the
    Sub-administrator had not waived fees and American General Annuity Insurance
    Company had not reimbursed expenses for the periods ended December 31, 1998,
    December 31, 1997 and December 31, 1996, net investment loss per share would
    have been $(0.26), $(0.42) and $(1.29), respectively, for the Van Kampen
    Emerging Growth Portfolio.
 
(2) Total return represents aggregate total return for the period indicated and
    is not annualized.
 
(3) If the Investment Adviser and the Sub-administrator had not waived fees and
    American General Annuity Insurance Company had not reimbursed expenses for
    the periods ended December 31, 1998, December 31, 1997 and December 31,
    1996, the ratio of operating expenses to average net assets would have been
    2.64%, 5.65% and 11.22%, respectively, for the Van Kampen Emerging Growth
    Portfolio.
 
(4) Annualized.
 
    The accompanying notes are an integral part of the financial statements
                                      F-48
<PAGE>   144
 
                                AGA SERIES TRUST
 
                         NOTES TO FINANCIAL STATEMENTS
                               DECEMBER 31, 1998
 
     AGA Series Trust, formerly WNL Series Trust, (the "Trust") is an open-end,
diversified series management investment company established as a Massachusetts
business trust under a Declaration of Trust dated December 12, 1994, as amended
April 19, 1995 and May 1, 1998. The Trust currently offers shares of beneficial
interest in seven series (the "Portfolios"), each of which has a different
investment objective and represents the entire interest in a separate portfolio
of investments. The Portfolios are: Credit Suisse Growth and Income Portfolio,
formerly BEA Growth and Income Portfolio, (the "Growth and Income Portfolio"),
Credit Suisse International Equity Portfolio (the "International Equity
Portfolio"), EliteValue Portfolio, Salomon Brothers U.S. Government Securities
Portfolio (the "U.S. Government Securities Portfolio"), State Street Global
Advisors Growth Equity Portfolio, formerly Global Advisors Growth Equity
Portfolio, (the "Growth Equity Portfolio"), State Street Global Advisors Money
Market Portfolio, formerly Global Advisors Money Market Portfolio, (the "Money
Market Portfolio"), and Van Kampen Emerging Growth Portfolio, formerly Van
Kampen American Capital Emerging Growth Portfolio, (the "Emerging Growth
Portfolio"). The Portfolios are currently available to the public only through
variable annuity contracts ("VA Contracts") issued by American General Annuity
Insurance Company, formerly Western National Life Insurance Company, (the "Life
Company"), an indirect wholly-owned subsidiary of American General Corporation.
 
1. SIGNIFICANT ACCOUNTING POLICIES
 
     The preparation of financial statements in accordance with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts and disclosures in the financial
statements. Actual results could differ from these estimates. The following is a
summary of significant accounting policies followed by the Trust in the
preparation of its financial statements in accordance with generally accepted
accounting principles.
 
     (a) VALUATION OF SECURITIES -- All securities are valued as of the close of
regular trading on the New York Stock Exchange (normally 4:00 p.m. New York
time). Securities traded on a national securities exchange or quoted on the
NASDAQ National Market System are valued at their last-reported sale price on
the principal exchange or reported by NASDAQ or, if there is no reported sale,
and in the case of over-the-counter securities not included in the NASDAQ
National Market System, at a bid price estimated by a broker or dealer. Debt
securities, including zero-coupon securities, and certain foreign securities
will be valued by a pricing service approved by the Trustees. Other foreign
securities will be valued by the Trust's custodian. The value of a foreign
security is determined in its national currency as of the close of trading on
the foreign exchange on which it is traded or as of 4:00 p.m. New York time, if
that is earlier, and that value is then converted into its U.S. dollar
equivalent at the foreign exchange rate in effect at noon, New York time, on the
day the value of the foreign security is determined. Securities for which
current market quotations are not readily available and all other assets are
valued at fair value as determined in good faith by the Trustees.
 
     The Money Market Portfolio values all securities using the amortized cost
method which approximates market value. Under this method, which does not take
into account unrealized securities gains or losses, an instrument is initially
valued at its cost and thereafter assumes a constant amortization or accretion
to maturity of any discount or premium.
 
     (b) REPURCHASE AGREEMENTS -- A repurchase agreement is a contract under
which the Portfolio acquires a security for a relatively short period (usually
not more than a week) subject to the obligation of the seller to repurchase and
the Portfolio to resell such security at a fixed time and price. The collateral
for such agreements will be held by the Portfolio's custodian. The Portfolio
will enter into repurchase agreements only with banks and broker-dealers that
have been determined to be creditworthy by the Trust's Board of Trustees. The
seller under a repurchase agreement would be required to maintain the value of
the collateral subject to the repurchase agreement at not less than the
repurchase price. Default by the seller would expose the Portfolio to possible
loss because of adverse market action or delay in connection with the
disposition of the
 
                                      F-49
<PAGE>   145
                                AGA SERIES TRUST
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
underlying collateral. In addition, if bankruptcy proceedings are commenced with
respect to the seller of the obligations, the Portfolio may be delayed or
limited in its ability to sell the collateral.
 
     (c) WHEN ISSUED TRANSACTIONS -- The Portfolio may enter into a when-issued
transaction for the purpose of acquiring portfolio securities and not for the
purpose of leverage, although a Portfolio may dispose of a when-issued security
or forward commitment prior to settlement if it is deemed appropriate to do so.
In such transactions, delivery of the securities occurs beyond the normal
settlement periods, but no payment or delivery is made by, and no interest
accrues to, the Portfolio prior to the actual delivery or payment by the other
party to the transaction. Due to fluctuations in the value of securities
purchased on a when-issued or a delayed-delivery basis, the yields obtained on
such securities may be higher or lower than the yields available in the market
on the dates when the investments are actually delivered to the buyers.
 
     (d) DOLLAR ROLL TRANSACTIONS -- Certain Portfolios seeking a high level of
current income may enter into dollar rolls in which the Portfolio sells
securities (usually Mortgage-Backed Securities) and simultaneously contracts to
purchase, typically in 30 to 60 days, substantially similar but not identical,
securities on a specified future date through a TBA purchase commitment. The
proceeds of the initial sale of securities in such transaction may be used to
purchase long-term securities which will be held during the dollar roll period.
During the roll period the Portfolio foregoes principal and interest paid on the
security sold at the beginning of the roll period. The Portfolio may be
compensated by; (a) the difference between the current sale price and the
forward price for the future purchase plus the interest earned on the cash
proceeds of the initial sale; or (b) a set fee determined at the time the
transaction is entered into; or (c) a combination of these two methods. Dollar
rolls involve the risk that the market value of the securities the Portfolio is
obligated to repurchase under the agreement may decline below the repurchase
price.
 
     (e) TBA PURCHASE COMMITMENTS -- Certain Portfolios may enter into "TBA" (to
be announced) purchase commitments to purchase securities for a fixed unit price
at a future date beyond customary settlement time. Although the unit price has
been established, the principal value has not been finalized. The Portfolio
holds, and maintains until settlement date, cash or high-grade debt obligations
in an amount sufficient to meet the purchase price, or the Portfolio may enter
into offsetting contracts for the forward sale of other securities it owns.
Income on the securities will not be earned until settlement date. TBA purchase
commitments may be considered securities in themselves, and involve a risk of
loss if the value of the security to be purchased declines prior to the
settlement date, which risk is in addition to the risk of decline in the value
of the Portfolio's other assets. Unsettled TBA purchase commitments are valued
at the current market value of the underlying securities, according to the
procedures described under "Valuation of Securities" above. The Portfolio may
dispose of the commitment prior to settlement if the Advisor deems it
appropriate to do so.
 
     (f) FOREIGN INVESTMENTS -- Certain Portfolios may invest in securities of
foreign issuers. There are certain risks involved in investing in foreign
securities, including those resulting from fluctuations in currency exchange
rates, devaluation of currencies, future political or economic developments and
the possible imposition of currency exchange control or other foreign
governmental laws or restrictions, reduced availability of public information
concerning issuers, and the fact that foreign companies are not generally
subject to uniform accounting, auditing and financial reporting standards or to
other regulatory practices and requirements comparable to those applicable to
domestic companies. The Portfolios' foreign investments may be less liquid and
their prices may be more volatile than comparable investments in securities of
U.S. companies.
 
     (g) FORWARD FOREIGN CURRENCY EXCHANGE CONTRACTS -- Certain Portfolios may
engage in forward foreign currency exchange contracts ("forward contracts").
Portfolios may enter into forward contracts to convert U.S. Dollars to and from
different foreign currencies. A Portfolio can either enter into these
transactions on a spot (i.e., cash) basis at the spot rate prevailing in the
foreign currency exchange market, or use forward contracts to purchase or sell
foreign currencies. Forward foreign currency contracts are valued at the
exchange rate and are marked-to-market daily. The change in the market value is
recorded by the Portfolio as an
                                      F-50
<PAGE>   146
                                AGA SERIES TRUST
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
unrealized gain or loss. When the contract is closed, the Portfolio records a
realized gain or loss equal to the difference between the value of the contract
at the time it was opened and the value at the time it was closed.
 
     A forward contract is an obligation by a Portfolio to purchase or sell a
specific currency at a future date. The Portfolio maintains with its custodian,
in a segregated account, high-grade liquid assets in an amount at least equal to
its obligations under each contract. Neither spot transactions nor forward
contracts eliminate fluctuations in the prices of the Portfolio's securities or
in foreign exchange rates, or prevent loss if the prices of these securities
should decline.
 
     A Portfolio may enter into forward contracts for hedging purposes as well
as for non-hedging purposes. Transactions are entered into for hedging purposes
in an attempt to protect against changes in foreign currency exchange rates that
would adversely affect a portfolio position or an anticipated portfolio
position. Although these transactions tend to minimize the risk of loss due to a
decline in the value of the hedged currency, at the same time they tend to limit
any potential gain that might be realized should the value of the hedged
currency increase.
 
     A Portfolio may enter into forward contracts for other than hedging
purposes which present greater profit potential but also involves increased
risk.
 
     (h) FOREIGN CURRENCY TRANSLATIONS -- The books and records of the
Portfolios are maintained in U.S. dollars. Foreign currencies, investments and
other assets and liabilities are translated into U.S. dollars at the exchange
rates prevailing at the end of the period, and purchases and sales of investment
securities, income and expenses are translated on the respective dates of such
transactions. The eligible Portfolios do not isolate that portion of the results
of operations from changes in foreign exchange rates on investments from the
fluctuations arising from changes in market prices of securities held. Such
changes and fluctuations are included with net realized and unrealized gain or
loss from investments. Foreign exchange gain (loss) is treated as ordinary
income for federal income tax purposes to the extent constituting "Section 988
Transactions" pursuant to the Internal Revenue Code, including currency gains
(losses) related to the sale of debt securities, forward foreign currency
exchange contracts, payments of liabilities, and collections of receivables.
 
     (i) FUTURES CONTRACTS -- Certain Portfolios may enter into futures
contracts. Upon entering into a futures contract, the Portfolio is required to
deposit with the broker an amount of cash or cash equivalents equal to a certain
percentage of the contract amount. This is known as the initial margin.
Subsequent payments ("variation margin") are made or received by the Portfolio
each day, depending on the daily fluctuation of the value of the contract. The
daily changes in the contract are recorded as unrealized gains or losses. The
Portfolio recognizes a realized gain or loss when the contract is closed.
 
     The use of futures contracts as a hedging device involves several risks.
The change in value of futures contracts primarily corresponds with the value of
their underlying instruments, which may not correlate with the change in value
of the hedged investments. In addition, the Portfolio may not be able to enter
into a closing transaction because of an illiquid secondary market.
 
     (j) SECURITIES TRANSACTIONS AND INVESTMENT INCOME -- Securities
transactions are recorded as of the trade date. Realized gains and losses on
sales of investments are recorded on the identified cost basis. Interest income
is recorded daily on the accrual basis. Dividend income is recorded on the
ex-date.
 
     (k) EXPENSE ALLOCATION -- Expenses with respect to any two or more
Portfolios may be allocated in proportion to the net assets of the respective
Portfolios except where allocations of direct expenses can otherwise be fairly
made.
 
     (l) DIVIDENDS AND DISTRIBUTIONS -- The Money Market Portfolio will declare
a dividend of its net ordinary income daily and distribute such dividends
monthly. Each of the other Portfolios will declare and
                                      F-51
<PAGE>   147
                                AGA SERIES TRUST
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
distribute dividends from net ordinary income quarterly and will distribute its
net realized capital gains, if any, at least annually.
 
     Income dividends and capital gain distributions are determined in
accordance with Federal tax regulations which may differ from generally accepted
accounting principles. These differences are primarily due to differing
treatments of income and gains on various investment securities held by the
Portfolios, timing differences and differing characterization of distributions
made by the Portfolios. As a result, net investment income (loss) and net
realized gain (loss) on investment transactions for a reporting period may
differ significantly from distributions during such period. Accordingly, each
Portfolio may periodically make reclassifications among certain of its capital
accounts without impacting the net asset value of the Portfolio.
 
     (m) FEDERAL INCOME TAXES -- Each Portfolio of the Trust intends to qualify
and elects to be treated as a regulated investment company that is taxed under
the rules of Subchapter M of the Internal Revenue Code. As an electing regulated
investment company, a Portfolio will not be subject to federal income tax on its
net ordinary income and net realized capital gains to the extent such income and
gains are distributed to the separate account of the Life Company which holds
its shares.
 
2. INVESTMENT ADVISORY FEES AND OTHER TRANSACTIONS WITH AFFILIATES
 
     Under an Investment Advisory Agreement (the "Agreement"), AGA Investment
Advisory Services, Inc., formerly WNL Investment Advisory Services, Inc., (the
"Adviser"), an indirect wholly-owned subsidiary of American General Corporation,
manages the business and affairs of the Portfolios and the Trust, subject to the
control of the Trustees. Under the Agreement, the Adviser is obligated to
formulate a continuing program for the investment of the assets of each
Portfolio of the Trust in a manner consistent with each Portfolio's investment
objectives, policies and restrictions and to determine from time to time
securities to be purchased, sold, retained or lent by the Trust and to implement
those decisions. The Agreement also provides that the Adviser shall provide such
services required for effective administration of the Trust.
 
     As full compensation for its services under the Agreement, the Trust will
pay the Adviser a monthly fee at the following rates based on the average daily
net assets of each Portfolio:
 
<TABLE>
<S>                                                           <C>
Credit Suisse Growth and Income.............................  0.75%
Credit Suisse International Equity..........................  0.90%
EliteValue..................................................  0.65%
Salomon Brothers U.S. Government Securities.................  0.475%
State Street Global Advisors Growth Equity..................  0.61%
State Street Global Advisors Money Market...................  0.45%
Van Kampen Emerging Growth..................................  0.75%
</TABLE>
 
     Through April 30, 1998 the Adviser waived that portion of its advisory fee
in excess of the amount payable by the Adviser to each Sub-adviser pursuant to
the respective sub-advisory agreements for each Portfolio. Beginning on May 1,
1998 the advisory fees are being charged to each Portfolios as shown in table
above.
 
                                      F-52
<PAGE>   148
                                AGA SERIES TRUST
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
     The Adviser pays each Sub-adviser the following fees:
 
<TABLE>
<S>                                                            <C>
Credit Suisse Growth and Income.............................       0.50%
Credit Suisse International Equity..........................       0.65%
EliteValue..................................................       0.40%
Salomon Brothers U.S. Government Securities.................       0.225%
State Street Global Advisors Growth Equity..................       0.36%
State Street Global Advisors Money Market...................       0.20%
Van Kampen Emerging Growth..................................       0.50%
</TABLE>
 
     In addition, the Life Company, an affiliate of the Adviser, has undertaken
to bear until May 1, 1999 all operating expenses of each Portfolio, excluding
the compensation of the Adviser, that exceed 0.12% of each Portfolio's average
daily net assets. The Life Company has reserved the right to withdraw or modify
its policy of expense reimbursement for the Trust.
 
     In accordance with each Portfolio's investment objective and policies and
under the supervision of the Adviser and the Trust's Board of Trustees, each
Portfolio's Sub-adviser is responsible for the day-to-day investment management
of the Portfolio, to make investment decisions for the Portfolio and to place
orders on behalf of the Portfolio to effect the investment decisions made as
provided in separate Sub-advisory Agreements. The Sub-advisers to the Portfolios
are: Credit Suisse Asset Management, formerly BEA Associates, for the Growth and
Income Portfolio; Credit Suisse Asset Management, Ltd. for the International
Equity Portfolio; OpCap Advisors for the EliteValue Portfolio; Salomon Brothers
Asset Management Inc. for the U.S. Government Securities Portfolio; State Street
Global Advisors for the Growth Equity and Money Market Portfolios; and Van
Kampen Asset Management Inc. for the Emerging Growth Portfolio.
 
     The Trust's Sub-administrator, custodian, transfer and dividend-paying
agent is State Street Bank and Trust Company.
 
     For the year ended December 31, 1998, the Adviser waived advisory fees and
the Life Company reimbursed operating expenses as follows:
 
<TABLE>
<CAPTION>
                                                        ADVISORY
                                                          FEES      EXPENSES
                                                         WAIVED    REIMBURSED    TOTAL
                                                        --------   ----------   --------
<S>                                                     <C>        <C>          <C>
Credit Suisse Growth and Income.......................   $6,992     $129,265    $136,257
Credit Suisse International Equity....................    3,842      142,666     146,508
EliteValue............................................    9,231       93,918     103,149
Salomon Brothers U.S. Government Securities...........    3,584      103,417     107,001
State Street Global Advisors Growth Equity............    6,950      130,500     137,450
State Street Global Advisors Money Market.............    4,461      102,412     106,873
Van Kampen Emerging Growth............................    5,221      134,825     140,046
</TABLE>
 
     AGA Brokerage Services, Inc., formerly WNL Brokerage Services, Inc., an
indirect wholly-owned subsidiary of American General Corporation, is the
distributor and underwriter of the VA Contracts. Each Trustee of the Trust who
is not an interested person of the Trust or Adviser or Sub-adviser receives an
annual fee of $7,500 and an additional fee of $750 for each Trustees' meeting
attended. In addition, disinterested Trustees who are members of any Board
committees will receive a separate $750 fee for attendance at any committee
meeting that is held on a day on which no Board meeting is held.
 
                                      F-53
<PAGE>   149
                                AGA SERIES TRUST
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
3. SECURITIES TRANSACTIONS
 
     The aggregate cost of purchases and proceeds from sales of securities,
excluding short-term investments, for the year ended December 31, 1998 were as
follows:
 
<TABLE>
<CAPTION>
                                                           U.S.                       PROCEEDS FROM
                                                        GOVERNMENT   PROCEEDS FROM   U.S. GOVERNMENT
                                           PURCHASES    PURCHASES        SALES            SALES
                                          -----------   ----------   -------------   ---------------
<S>                                       <C>           <C>          <C>             <C>
Credit Suisse Growth and Income.........  $ 9,049,134   $7,948,695    $ 7,295,352      $7,570,270
Credit Suisse International Equity......    4,381,274           --      2,736,485              --
EliteValue..............................   11,726,391      510,430      4,167,588         178,783
Salomon Brothers U.S. Government
  Securities............................      118,045    3,581,380             --       1,144,543
State Street Global Advisors Growth
  Equity................................   19,283,192      138,536     13,359,264         228,203
State Street Global Advisors Money
  Market................................           --           --             --              --
Van Kampen Emerging Growth..............   10,192,545       35,218      6,849,316          32,863
</TABLE>
 
4. SHARES OF BENEFICIAL INTEREST
 
     The Trust has an unlimited authorized number of shares of beneficial
interest with a par value of $0.01. The tables below summarize transactions in
Trust shares.
 
                   CREDIT SUISSE GROWTH AND INCOME PORTFOLIO
 
<TABLE>
<CAPTION>
                                                      YEAR ENDED               YEAR ENDED
                                                  DECEMBER 31, 1998        DECEMBER 31, 1997
                                                 SHARES      AMOUNT       SHARES      AMOUNT
<S>                                             <C>        <C>           <C>        <C>
Capital stock sold............................   792,134   $10,722,666    364,640   $ 4,535,552
Capital stock issued upon reinvestment of
  dividends and distributions.................    46,708       644,316     30,006       376,771
Capital stock redeemed........................  (216,635)   (2,934,678)   (98,914)   (1,251,232)
                                                --------   -----------   --------   -----------
          Net increase........................   622,207   $ 8,432,304    295,732   $ 3,661,091
                                                ========   ===========   ========   ===========
</TABLE>
 
                  CREDIT SUISSE INTERNATIONAL EQUITY PORTFOLIO
 
<TABLE>
<CAPTION>
                                                      YEAR ENDED               YEAR ENDED
                                                  DECEMBER 31, 1998        DECEMBER 31, 1997
                                                 SHARES      AMOUNT       SHARES      AMOUNT
<S>                                             <C>        <C>           <C>        <C>
Capital stock sold............................   272,097   $ 2,783,727    177,329   $ 2,089,267
Capital stock issued upon reinvestment of
  dividends and distributions.................     1,499        16,424     28,680       300,498
Capital stock redeemed........................  (103,928)   (1,053,158)   (45,050)     (532,186)
                                                --------   -----------   --------   -----------
          Net increase........................   169,668   $ 1,746,993    160,959   $ 1,857,579
                                                ========   ===========   ========   ===========
</TABLE>
 
                                      F-54
<PAGE>   150
                                AGA SERIES TRUST
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
                              ELITEVALUE PORTFOLIO
 
<TABLE>
<CAPTION>
                                                      YEAR ENDED               YEAR ENDED
                                                  DECEMBER 31, 1998        DECEMBER 31, 1997
                                                 SHARES      AMOUNT       SHARES      AMOUNT
<S>                                             <C>        <C>           <C>        <C>
Capital stock sold............................   989,195   $14,792,557    562,538   $ 7,853,515
Capital stock issued upon reinvestment of
  dividends and distributions.................    29,857       448,216     21,013       300,551
Capital stock redeemed........................  (298,572)   (4,382,494)  (112,176)   (1,599,850)
                                                --------   -----------   --------   -----------
          Net increase........................   720,480   $10,858,279    471,375   $ 6,554,216
                                                ========   ===========   ========   ===========
</TABLE>
 
             SALOMON BROTHERS U.S. GOVERNMENT SECURITIES PORTFOLIO
 
<TABLE>
<CAPTION>
                                                      YEAR ENDED               YEAR ENDED
                                                  DECEMBER 31, 1998        DECEMBER 31, 1997
                                                 SHARES      AMOUNT       SHARES      AMOUNT
<S>                                             <C>        <C>           <C>        <C>
Capital stock sold............................   589,383   $ 6,067,048    167,218   $ 1,688,562
Capital stock issued upon reinvestment of
  dividends and distributions.................    33,449       341,645     16,187       160,062
Capital stock redeemed........................  (170,600)   (1,757,093)   (27,188)     (271,281)
                                                --------   -----------   --------   -----------
          Net increase........................   452,232   $ 4,651,600    156,217   $ 1,577,343
                                                ========   ===========   ========   ===========
</TABLE>
 
              STATE STREET GLOBAL ADVISORS GROWTH EQUITY PORTFOLIO
 
<TABLE>
<CAPTION>
                                                      YEAR ENDED               YEAR ENDED
                                                  DECEMBER 31, 1998        DECEMBER 31, 1997
                                                 SHARES      AMOUNT       SHARES      AMOUNT
<S>                                             <C>        <C>           <C>        <C>
Capital stock sold............................   544,056   $ 8,356,169    239,753   $ 3,380,388
Capital stock issued upon reinvestment of
  dividends and distributions.................    27,475       449,775     50,305       706,482
Capital stock redeemed........................  (157,065)   (2,387,446)   (57,888)     (842,461)
                                                --------   -----------   --------   -----------
          Net increase........................   414,466   $ 6,418,498    232,170   $ 3,244,409
                                                ========   ===========   ========   ===========
</TABLE>
 
              STATE STREET GLOBAL ADVISORS MONEY MARKET PORTFOLIO
 
<TABLE>
<CAPTION>
                                                     YEAR ENDED                   YEAR ENDED
                                                 DECEMBER 31, 1998            DECEMBER 31, 1997
                                               SHARES         AMOUNT        SHARES         AMOUNT
<S>                                          <C>           <C>            <C>           <C>
Capital stock sold.........................   46,307,126   $ 46,307,126    27,649,529   $ 27,649,529
Capital stock issued upon reinvestment of
  dividends and distributions..............      275,567        275,567       159,789        159,789
Capital stock redeemed.....................  (42,429,271)   (42,429,271)  (24,000,078)   (24,000,078)
                                             -----------   ------------   -----------   ------------
          Net increase.....................    4,153,422   $  4,153,422     3,809,240   $  3,809,240
                                             ===========   ============   ===========   ============
</TABLE>
 
                                      F-55
<PAGE>   151
                                AGA SERIES TRUST
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
                      VAN KAMPEN EMERGING GROWTH PORTFOLIO
 
<TABLE>
<CAPTION>
                                                      YEAR ENDED               YEAR ENDED
                                                  DECEMBER 31, 1998        DECEMBER 31, 1997
                                                 SHARES      AMOUNT       SHARES      AMOUNT
<S>                                             <C>        <C>           <C>        <C>
Capital stock sold............................   357,277   $ 5,569,032    387,792   $ 4,961,448
Capital stock issued upon reinvestment of
  dividends and distributions.................        30           481        617         7,882
Capital stock redeemed........................  (141,146)   (2,207,565)  (154,969)   (1,955,287)
                                                --------   -----------   --------   -----------
          Net increase........................   216,161   $ 3,361,948    233,440   $ 3,014,043
                                                ========   ===========   ========   ===========
</TABLE>
 
5. FORWARD FOREIGN CURRENCY EXCHANGE CONTRACTS
 
     At December 31, 1998, the outstanding forward foreign currency exchange
contracts, which contractually obligate the Trust to deliver currencies at a
specified date, were as follows:
 
  Credit Suisse International Equity Portfolio
 
<TABLE>
<CAPTION>
                        U.S. DOLLAR
                         PRICE ON     U.S. DOLLAR
CURRENCY   SETTLEMENT   ORIGINATION     CURRENT       UNREALIZED
  SOLD        DATE         DATE          VALUE      (DEPRECIATION)
- --------   ----------   -----------   -----------   --------------
<S>        <C>          <C>           <C>           <C>
FRF        2/25/1999     $133,655      $136,616        $ (2,961)
JPY        3/09/1999      554,135       580,199         (26,064)
NLG        2/25/1999      120,549       123,285          (2,736)
                         $808,339      $840,100        $(31,761)
                         --------      --------        --------
</TABLE>
 
7. TAX INFORMATION
 
     For Federal income tax purposes capital loss carryforwards (exclusive of
certain capital losses incurred after October 31) of $84,949 and $254,219 is
available to the extent provided by regulations to offset future realized
capital gains of the Van Kampen Emerging Growth Portfolio. These losses will
expire in 2005 and 2006, respectively. In addition, $317,406 is available to the
extent provided by regulations to offset future realized capital gains of Credit
Suisse International Equity Portfolio and this loss expires in 2006.
 
     Additionally, certain capital losses incurred after October 31, within the
taxable year, are deemed to arise on the first business day of the Portfolio's
next taxable year. During the year ended December 31, 1998, the Credit Suisse
International Equity Portfolio elected to defer a net capital loss of $4,727.
 
8. SUBSEQUENT EVENT
 
     On January 6, 1999, Salomon Brothers Asset Management Inc., notified the
Adviser of the termination of their Sub-Advisory relationship as of March 8,
1999.
 
                                      F-56
<PAGE>   152
                                AGA SERIES TRUST
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
                               DECEMBER 31, 1998
 
9. YEAR 2000 RISK (UNAUDITED)
 
     Like other mutual funds, financial and business organizations and
individuals around the world, the Trust could be adversely affected if the
computer systems of the Adviser and the sub-advisers and other service
providers, over which the Trust may have no control, do not properly process and
calculate date-related information and data from and after January 1, 2000. This
is commonly referred to as the "Year 2000 Problem." The Adviser is taking steps
that it believes are reasonably designed to address the Year 2000 Problem with
respect to computer systems that it uses. The Adviser is also seeking assurances
that its sub-advisers and other service providers are taking similar steps as
well. However, it is impossible to know exactly how the Year 2000 Problem will
affect the administration of the Trust, performance of the Trust's portfolios or
securities markets in general.
 
                                      F-57
<PAGE>   153
 
               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
To the Trustees and Contract Owners of
AGA Series Trust
 
     We have audited the accompanying statement of assets and liabilities,
including the schedules of investments, of AGA Series Trust (comprising,
respectively, the Credit Suisse Growth and Income, Credit Suisse International
Equity, EliteValue, Salomon Brothers U.S. Government Securities, State Street
Global Advisors Growth Equity, State Street Global Advisors Money Market, and
Van Kampen Emerging Growth Portfolios) as of December 31, 1998, the related
statements of operations, changes in net assets and financial highlights for the
year then ended. These financial statements and financial highlights are the
responsibility of AGA Series Trust management. Our responsibility is to express
an opinion on the financial statements and financial highlights based on our
audit. The statements of changes in net assets of AGA Series Trust for the year
ended December 31, 1997 and the financial highlights for each of the three years
in the period ended December 31, 1997 were audited by other auditors whose
report dated February 13, 1998 expressed an unqualified opinion on these
financial statements and financial highlights.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements and financial
highlights are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. Our procedures included confirmation of securities owned as of
December 31, 1998, by correspondence with the custodian and brokers or by other
appropriated auditing procedures where replies from brokers were not received.
An audit also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audit provides a reasonable basis
for our opinion.
 
     In our opinion, the financial statements and financial highlights referred
to above present fairly, in all material respects, the financial position of
each of the respective portfolios constituting AGA Series Trust at December 31,
1998, the results of their operations, the changes in their net assets and
financial highlights for the year then ended in conformity with generally
accepted accounting principles.
 
ERNST & YOUNG LLP
Boston, Massachusetts
February 5, 1999
 
                                      F-58
<PAGE>   154
 
                                AGA SERIES TRUST
 
                        PROXY VOTING RESULTS (UNAUDITED)
 
     The following proposal was voted upon at a special meeting of shareholders
on April 16, 1998. The results were as shown below.
 
PROPOSAL 1.
 
     To approve a new Sub-Advisory Agreement between Salomon Brothers Asset
Management, Inc., AGA Investment Advisory Services, Inc. and AGA Series Trust.
 
<TABLE>
<CAPTION>
                                                                FOR     AGAINST   ABSTAIN
                                                              -------   -------   -------
<S>                                                           <C>       <C>       <C>
Record Date Shares (429,327)
Salomon Brothers U.S. Government Securities Portfolio.......  311,976   20,209    97,142
</TABLE>
 
                                      F-59
<PAGE>   155
 
<TABLE>
<S>                                                          <C>
AMERICAN GENERAL ANNUITY INSURANCE COMPANY
VARIABLE ANNUITY SERVICE CENTER
205 E. 10TH AVENUE
AMARILLO, TEXAS 79101
</TABLE>
 
VER 12/31/98                                                Recycled Paper  LOGO


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