BARR ROSENBERG SERIES TRUST
497, 1997-07-30
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<PAGE>
                          BARR ROSENBERG SERIES TRUST
                               3435 STELZER ROAD
                              COLUMBUS, OHIO 43219
                   1-800-447-3332 (ADVISER AND SELECT SHARES)
                     1-800-527-6026 (INSTITUTIONAL SHARES)
                                 JULY 18, 1997
 
    Barr Rosenberg Series Trust (the "Trust") is an open-end management
investment company offering the following three diversified portfolios with
different investment objectives and strategies: U.S. Small Capitalization
Series, International Small Capitalization Series and Japan Series. The Trust's
portfolios are referred to individually as a "Series" or a "Fund," and
collectively as the "Series" or the "Funds." Each Fund's investment manager is
Rosenberg Institutional Equity Management (the "Manager").
 
                           DOMESTIC EQUITY PORTFOLIO
 
    The U.S. SMALL CAPITALIZATION SERIES seeks a total return greater than that
of the Russell 2000 Index through investment primarily in equity securities of
smaller companies that are traded principally in the markets of the United
States. The Fund is designed for long-term investors willing to assume
above-average risk in return for above-average capital growth potential.
 
                        INTERNATIONAL EQUITY PORTFOLIOS
 
    The INTERNATIONAL SMALL CAPITALIZATION SERIES seeks a total return greater
than that of the Cazenove Rosenberg Global Smaller Companies Index excluding the
United States ("CRIexUS") through investment primarily in equity securities of
smaller companies that are traded principally in markets outside of the United
States. The Fund is designed for long-term investors willing to assume
above-average risk in return for above-average capital growth potential.
 
    The JAPAN SERIES seeks a total return greater than that of the Tokyo Stock
Price Index of the Tokyo Stock Exchange ("TOPIX") through investment in Japanese
securities, primarily in common stocks of Japanese companies traded in Japanese
markets. The Fund is designed for long-term investors willing to assume above-
average risk in return for above-average capital growth potential.
 
    Each Fund offers three classes of shares: Institutional Shares, Adviser
Shares and Select Shares. Whether an investor is eligible to purchase
Institutional, Adviser or Select Shares generally depends on the amount invested
in a particular Fund and on whether the investor makes the investment in the
Fund directly or through a financial adviser. The classes differ primarily with
respect to (i) the level of Shareholder Service Fee and (ii) the level of
Distribution Fee borne by each class.
 
    This Prospectus concisely describes the information which investors ought to
know before investing. Please read this Prospectus carefully and keep it for
future reference.
 
    A Statement of Additional Information dated July 18, 1997 (the "Statement")
is available free of charge by writing to Barr Rosenberg Funds Distributor,
Inc., the Funds' distributor (the "Distributor"), at 3435 Stelzer Road,
Columbus, Ohio 43219 or by telephoning 1-800-447-3332 (for Adviser and Select
Share customers) and 1-800-527-6026 (for Institutional Share customers). The
Statement, which contains more detailed information about the Trust, has been
filed with the Securities and Exchange Commission (the "Commission") and is
incorporated by reference in this Prospectus. The Commission maintains a World
Wide Web site at http://www.sec.gov that contains the Statement and other
information regarding the Trust.
 
    SHARES OF THE FUNDS ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR
ENDORSED BY, ANY FINANCIAL INSTITUTION, ARE NOT FEDERALLY INSURED BY THE FEDERAL
DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY,
AND INVOLVE RISK, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.
 
    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED ON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
<PAGE>
                               TABLE OF CONTENTS
 
                                                                           PAGE
                                                                           ----
 
FUND EXPENSES.........................................................       3
 
FINANCIAL HIGHLIGHTS..................................................       5
 
INVESTMENT OBJECTIVES AND POLICIES....................................       8
 
GENERAL DESCRIPTION OF RISKS AND FUND INVESTMENTS.....................      11
 
INVESTMENT PERFORMANCE................................................      15
 
MANAGEMENT OF THE TRUST...............................................      19
 
MULTIPLE CLASSES......................................................      27
 
PURCHASE OF SHARES....................................................      28
 
IRA ACCOUNTS..........................................................      30
 
REDEMPTION OF SHARES..................................................      30
 
EXCHANGE OF FUND SHARES...............................................      32
 
DETERMINATION OF NET ASSET VALUE......................................      33
 
DISTRIBUTIONS.........................................................      34
 
TAXES.................................................................      34
 
DESCRIPTION OF THE TRUST AND OWNERSHIP OF SHARES......................      35
 
SHAREHOLDER INQUIRIES.................................................      36
 
                                       2
<PAGE>
                                 FUND EXPENSES
 
    The annual expenses of each of the Funds are set forth in the following
tables, the forms of which are prescribed by federal securities laws and
regulations.
 
    ANNUAL FUND OPERATING EXPENSES
(AS A PERCENTAGE OF AVERAGE NET ASSETS)
 
<TABLE>
<CAPTION>
                                                                                                 OTHER         TOTAL FUND
                                                    MANAGEMENT   SHAREHOLDER                    EXPENSES       OPERATING
                                                    FEE (AFTER     SERVICE     DISTRIBUTION   (AFTER REIM-      EXPENSES
                                                     WAIVER)         FEE           FEE         BURSEMENT)    (AFTER WAIVER)
                                                    ----------   -----------   ------------   ------------   --------------
<S>                                                 <C>          <C>           <C>            <C>            <C>
INSTITUTIONAL SHARES
  U.S. Small Capitalization Series................    0.46%          None          None          0.69%           1.15%
  International Small Capitalization Series.......    0.00%          None          None          1.50%           1.50%
  Japan Series....................................    0.00%          None          None          1.50%           1.50%
ADVISER SHARES
  U.S. Small Capitalization Series................    0.46%         0.25%          None          0.69%           1.40%
  International Small Capitalization Series.......    0.00%         0.25%          None          1.50%           1.75%
  Japan Series....................................    0.00%         0.25%          None          1.50%           1.75%
SELECT SHARES
  U.S. Small Capitalization Series................    0.46%         0.25%         0.25%          0.69%           1.65%
  International Small Capitalization Series.......    0.00%         0.25%         0.25%          1.50%           2.00%
  Japan Series....................................    0.00%         0.25%         0.25%          1.50%           2.00%
</TABLE>
 
    The expense information in the table relating to the U.S. Small
Capitalization Series and the Japan Series has been restated to reflect an
increase of 0.10% in their respective management fees effective on August 6,
1996 and an increase in the expense limitation of the U.S. Small Capitalization
Series and the Japan Series from 0.90% to 1.15% and 1.00% to 1.50%,
respectively, effective on August 6, 1996. In addition, no Shareholder Service
Fees or Distribution Fees were charged in the fiscal year ended March 31, 1997.
 
    The Manager has agreed to reduce its management fee and bear certain
expenses until further notice in order to limit the total annual operating
expenses (which do not include nonrecurring account fees and extraordinary
expenses) of each class to the percentage of a Fund's total annual operating
expenses attributable to that class listed under Total Fund Operating Expenses
above. Absent such agreement by the Manager to waive its fee and bear such
expenses and absent waiver of the Shareholder Service Fee and Distribution Fee,
(1) the U.S. Small Capitalization Series' management fees would be 0.90% and
Total Fund Operating Expenses would be 1.54% for Institutional Shares, 1.79% for
Adviser Shares and 2.04% for Select Shares; (2) the Japan Series' management
fees would be 1.00%, Other Expenses would be 12.33% and Total Fund Operating
Expenses would be 13.33% for Institutional Shares and 13.83% for Select Shares;
and (3) the International Small Capitalization Series' management fees would be
1.00%, estimated Other Expenses
 
                                       3
<PAGE>
would be 6.46% and estimated Total Fund Operating Expenses would be 7.46% for
Institutional Shares, 7.71% for Adviser Shares and 7.96% for Select Shares. See
"Management of the Trust."
 
    The percentages listed above under Other Expenses with respect to the U.S.
Small Capitalization Series are the actual expenses incurred for the fiscal year
ended March 31, 1997. The estimated percentages listed above under Other
Expenses and Total Fund Operating Expenses with respect to the International
Small Capitalization Series have been based on annualized amounts for the Fund's
first fiscal year. Furthermore, no Adviser Shares of each of the Japan Series
and the International Small Capitalization Series were sold in the fiscal year
ended March 31, 1997.
 
EXAMPLE:
 
<TABLE>
<CAPTION>
                                                     YOU WOULD PAY THE FOLLOWING
                                                        EXPENSES ON A $1,000
                                                      INVESTMENT ASSUMING A 5%
                                                       ANNUAL RETURN (WITH OR
                                                     WITHOUT A REDEMPTION AT THE
                                                      END OF EACH TIME PERIOD):
                                                    -----------------------------
                                                      1       3       5      10
                                                    YEAR    YEARS   YEARS   YEARS
                                                    -----   -----   -----   -----
<S>                                                 <C>     <C>     <C>     <C>
INSTITUTIONAL SHARES
  U.S. Small Capitalization Series................    12      37       63     140
  International Small Capitalization Series.......    15      47       --      --
  Japan Series....................................    15      47       82     179
ADVISER SHARES
  U.S. Small Capitalization Series................    14      44       77     168
  International Small Capitalization Series.......    18      55       --      --
  Japan Series....................................    18      55       95     206
SELECT SHARES
  U.S. Small Capitalization Series................    17      52       90     195
  International Small Capitalization Series.......    20      63       --      --
  Japan Series....................................    20      63      108     233
</TABLE>
 
    THE PURPOSE OF THIS TABLE IS TO ASSIST IN UNDERSTANDING THE VARIOUS COSTS
AND EXPENSES OF THE FUNDS THAT ARE BORNE DIRECTLY OR INDIRECTLY BY HOLDERS OF
SHARES OF THE FUNDS. THE EXPENSES USED IN THE EXAMPLE, AND THE FIVE PERCENT
ANNUAL RETURN, WHICH IS MANDATED BY THE SECURITIES AND EXCHANGE COMMISSION, ARE
NOT REPRESENTATIONS OF PAST OR FUTURE EXPENSES OR PERFORMANCE; ACTUAL EXPENSES
AND/OR PERFORMANCE MAY BE MORE OR LESS THAN THOSE SHOWN.
 
                                       4
<PAGE>
                              FINANCIAL HIGHLIGHTS
 
    The following tables present per share financial information for the periods
listed for each Fund. Each of the Financial Highlights has been audited by Price
Waterhouse LLP, independent accountants, whose report on the financial
statements of the Funds appears in the Funds' Annual Report for the fiscal year
ended March 31, 1997 (the "Annual Report"). These statements should be read in
conjunction with the "Report of Independent Accountants," the other audited
financial statements and related notes which are contained in the Annual Report
and are incorporated by reference into this Prospectus and the Statement of
Additional Information.
 
                        U.S. SMALL CAPITALIZATION SERIES
<TABLE>
<CAPTION>
                                                               FOR THE YEAR ENDED MARCH 31,
                                ------------------------------------------------------------------------------------------
                                                                                       INSTITUTIONAL SHARES
                                                1997
                                -------------------------------------   --------------------------------------------------
(For a Share outstanding        INSTITUTIONAL    SELECT      ADVISER
throughout each period)            SHARES       SHARES(1)   SHARES(2)     1996      1995      1994       1993       1992
                                -------------   ---------   ---------   --------   -------   -------   --------   --------
<S>                             <C>             <C>         <C>         <C>        <C>       <C>       <C>        <C>
Net asset value at beginning
  of period...................     $    7.60      $ 8.49      $ 7.38    $   6.97   $  7.36   $ 12.33   $  12.04   $  10.74
                                -------------   ---------   ---------   --------   -------   -------   --------   --------
Income from Investment
  Operations
  Net investment income *.....          0.04        0.07        0.02        0.03      0.01      0.08       0.13       0.11
  Net realized and unrealized
    gain on investments and
    foreign currency..........          1.39        0.47       (0.26)       2.34      0.78      1.28       2.31       1.53
                                -------------   ---------   ---------   --------   -------   -------   --------   --------
    Total from investment
      operations..............          1.43        0.54       (0.24)       2.37      0.79      1.36       2.44       1.64
                                -------------   ---------   ---------   --------   -------   -------   --------   --------
Distributions to shareholders
  from:
  Net investment income.......         (0.05)      (0.05)         --       (0.01)    (0.08)    (0.14)     (0.10)     (0.08)
  Net realized gain on
    investments...............         (1.85)      (1.85)         --       (1.73)    (1.10)    (6.19)     (2.05)     (0.26)
                                -------------   ---------   ---------   --------   -------   -------   --------   --------
    Total distributions.......         (1.90)      (1.90)         --       (1.74)    (1.18)    (6.33)     (2.15)     (0.34)
                                -------------   ---------   ---------   --------   -------   -------   --------   --------
Net asset value at end of
  period......................     $    7.13      $ 7.13      $ 7.14    $   7.60   $  6.97   $  7.36   $  12.33   $  12.04
                                -------------   ---------   ---------   --------   -------   -------   --------   --------
                                -------------   ---------   ---------   --------   -------   -------   --------   --------
Total return **...............         19.53%       6.84%      (3.25)%     35.69%    12.21%    12.83%     22.51%     15.79%
Net assets, end of period
  (000).......................     $  82,116      $2,375      $  208    $ 60,046   $56,910   $52,500   $ 69,458   $119,343
Ratio of net expenses to
  average daily net
  assets(a)...................          1.07%       1.15%+      1.15%+      0.90%     0.90%     0.90%      0.90%      0.90%
Ratio of net expenses to
  average daily net assets
  before waiver/
  reimbursement...............          1.54%       1.54%+      1.54%+      1.15%     1.17%     1.14%      1.03%      0.94%
Ratio of net investment income
  to average daily net
  assets......................          0.35%       0.46%+      0.46%+      0.47%     0.60%     0.60%      0.59%      0.66%
Portfolio turnover rate.......        126.83%     126.83%     126.83%      71.87%    57.27%    59.61%     32.61%     59.04%
Average commission rate.......     $  0.0327      $0.0327     $0.0327         --        --        --         --         --
 
<CAPTION>
 
                                   FOR THE YEAR ENDED MARCH 31,
                                ----------------------------------
 
                                          INSTITUTIONAL
 
                                              SHARES
 
(For a Share outstanding        ----------------------------------
throughout each period)           1991         1990       1989(3)
                                --------     --------     --------
<S>                             <C>          <C>          <C>
Net asset value at beginning
  of period...................  $  10.70     $  10.34     $  10.00
                                --------     --------     --------
Income from Investment
  Operations
  Net investment income *.....      0.09         0.08         0.11
  Net realized and unrealized
    gain on investments and
    foreign currency..........      0.05         0.67         0.23
                                --------     --------     --------
    Total from investment
      operations..............      0.14         0.75         0.34
                                --------     --------     --------
Distributions to shareholders
  from:
  Net investment income.......     (0.07)       (0.15)          --
  Net realized gain on
    investments...............     (0.03)       (0.24)          --
                                --------     --------     --------
    Total distributions.......     (0.10)       (0.39)          --
                                --------     --------     --------
Net asset value at end of
  period......................  $  10.74     $  10.70     $  10.34
                                --------     --------     --------
                                --------     --------     --------
Total return **...............      1.56%        7.37%       39.06%
Net assets, end of period
  (000).......................  $171,942     $113,222     $ 57,058
Ratio of net expenses to
  average daily net
  assets(a)...................      0.90%        0.90%        0.90%+
Ratio of net expenses to
  average daily net assets
  before waiver/
  reimbursement...............      1.04%        1.06%        1.86%+
Ratio of net investment income
  to average daily net
  assets......................      1.22%        1.24%       10.10%+
Portfolio turnover rate.......     64.97%       60.10%        0.04%
Average commission rate.......        --           --           --
</TABLE>
 
- ---------------------------
 
(1) Shares of the Class were first offered for sale to investors on October 22,
    1996.
 
(2) Shares of the Class were first offered for sale to investors on January 21,
    1997.
 
(3) The Fund commenced operations on February 22, 1989.
 
*   Net of fees and expenses waived/reimbursed by the Manager in the amount of
    $.04, $.04, $.04, $.02, $.01, $.05, $.03, $.01, $.01, $.01 and $.01 per
    share.
 
**  Total return would have been lower had certain fees and expenses not been
    waived/reimbursed by the Manager.
 
(a) Difference in expense ratios between classes for 1997 is due to the change
    in the maximum expense ratio charged to the Fund during the year and the
    introduction of the Select and Adviser Shares after such change.
 
+   Computed on an annualized basis.
 
                                       5
<PAGE>
                                  JAPAN SERIES
 
<TABLE>
<CAPTION>
                                                                  FOR THE YEAR ENDED MARCH 31,
                              -----------------------------------------------------------------------------------------------------
                                        1997
                              -------------------------                             INSTITUTIONAL SHARES
(For a Share outstanding      INSTITUTIONAL    SELECT    --------------------------------------------------------------------------
throughout each period)          SHARES      SHARES(1)    1996     1995     1994     1993      1992     1991      1990     1989(2)
                              -------------  ----------  -------  -------  -------  -------  --------  -------  --------  ---------
<S>                           <C>            <C>         <C>      <C>      <C>      <C>      <C>       <C>      <C>       <C>
Net asset value at beginning
 of period...................   $  8.77      $  8.08     $ 8.96   $ 8.25   $ 6.94   $ 6.15   $  7.87   $ 8.23   $  9.88   $10.00
                              -------------  ----------  -------  -------  -------  -------  --------  -------  --------  ---------
Income (loss) from Investment
 Operations
  Net investment income
    (loss)*..................     (0.05)(a)    (0.01)(a)   0.04     0.10    (0.01)    0.02      0.04     0.06      0.06     0.02
  Net realized and unrealized
    gain/(loss) on
    investments and foreign
    currency.................     (2.45)       (1.80)     (0.15)    0.63     1.41     0.84     (1.69)    0.09     (1.67)   (0.14)
                              -------------  ----------  -------  -------  -------  -------  --------  -------  --------  ---------
    Total from investment
      operations.............     (2.50)       (1.81)     (0.11)    0.73     1.40     0.86     (1.65)    0.15     (1.61)   (0.12)
                              -------------  ----------  -------  -------  -------  -------  --------  -------  --------  ---------
Distributions to shareholders
 from:
  Net investment income......     (0.04)       (0.04)        --       --       --    (0.07)    (0.07)   (0.07)    (0.04)      --
  In excess of net investment
    income...................     (0.03)       (0.03)     (0.08)   (0.02)   (0.09)      --        --       --        --       --
  Net realized gain on
    investments..............                                --       --       --       --        --    (0.44)       --       --
                              -------------  ----------  -------  -------  -------  -------  --------  -------  --------  ---------
    Total distributions......     (0.07)       (0.07)     (0.08)   (0.02)   (0.09)   (0.07)    (0.07)   (0.51)    (0.04)      --
                              -------------  ----------  -------  -------  -------  -------  --------  -------  --------  ---------
Net asset value at end of
 period......................   $  6.20      $  6.20     $ 8.77   $ 8.96   $ 8.25   $ 6.94   $  6.15   $ 7.87   $  8.23   $ 9.88
                              -------------  ----------  -------  -------  -------  -------  --------  -------  --------  ---------
Total return **..............    (28.68%)     (22.59%)    (1.20%)   8.86%   20.35%   14.24%   (21.09%)   1.94%   (16.39%)  (4.94%)
 
Net assets, end of period
 (000).......................   $ 1,009      $    13     $1,378   $1,385   $1,258   $1,044   $   915   $1,864   $ 1,829   $2,186
                              -------------  ----------  -------  -------  -------  -------  --------  -------  --------  ---------
                              -------------  ----------  -------  -------  -------  -------  --------  -------  --------  ---------
Ratio of net expenses to
 average daily net
 assets(b)...................      1.42%        1.50%+     1.00%    1.00%    1.00%    0.70%     0.59%    0.02%     0.00%    0.28%+
Ratio of net expenses to
 average daily net assets
 before waiver/
 reimbursement...............     13.33%       13.33%+     7.16%    7.02%    7.63%   10.70%     8.56%    8.40%     7.35%    9.30%+
Ratio of net investment
 income/ (loss) to average
 daily net assets............     (0.63%)       0.00%+    (0.22%)  (0.20%)  (0.26%)   0.37%     0.20%    0.76%     0.62%    0.88%+
Portfolio turnover rate......     51.70%       51.70%     60.60%   57.10%   74.60%  162.10%    53.13%   78.61%    87.72%    0.00%
Average commission rate......   $0.0165      $0.0165         --       --       --       --        --       --        --       --
</TABLE>
 
- ---------------------------
 
(1) Shares of the Class were first offered for sale to investors on October 22,
    1996.
 
(2) The Fund commenced operations on January 3, 1989.
 
*   Net of fees and expenses waived/reimbursed by the Manager (and Administrator
    for 1997) in the amount of $.95, $.95, $.38, $.67, $.49, $.59, $1.64, $.71,
    $.74 and $.21 per share.
 
**  Total return would have been lower had certain fees and expenses not been
    waived/reimbursed by the Manager (and Administrator for 1997).
 
(a) Calculated based on the average shares outstanding during the period.
 
(b) Difference in expense ratios between classes for 1997 is due to the change
    in the maximum expense ratio charged to the Fund during the year and the
    introduction of the Select Shares after such change.
 
+   Computed on an annualized basis.
 
                                       6
<PAGE>
                   INTERNATIONAL SMALL CAPITALIZATION SERIES
 
<TABLE>
<CAPTION>
                                                                           SEPTEMBER 23, 1996
                                                                      (COMMENCEMENT OF OPERATIONS)
                                                                         THROUGH MARCH 31, 1997
                                                                      ----------------------------
                                                                      INSTITUTIONAL     SELECT
For a share outstanding throughout the period                            SHARES       SHARES(1)
                                                                      ------------  --------------
<S>                                                                   <C>           <C>
Net asset value at beginning of period..............................  $   10.00      $   10.04
                                                                      ------------     -------
Income from Investment Operations:
  Net investment income*............................................       0.02(a)        0.02(a)
  Net realized and unrealized gain on investments
    and foreign currency............................................       0.11           0.07
                                                                      ------------     -------
        Total from investment operations............................       0.13           0.09
                                                                      ------------     -------
  Net asset value at end of period..................................  $   10.13      $   10.13
                                                                      ------------     -------
                                                                      ------------     -------
  Total Return**....................................................       1.30%          0.90%
  Net assets, end of period (000)...................................  $  12,859      $     185
                                                                      ------------     -------
                                                                      ------------     -------
  Ratio of net expenses to average daily net assets+................       1.50%+         1.50%+
  Ratio of expenses to average daily net assets
    before waiver/reimbursement+....................................       7.46%+         7.46%+
  Ratio of net investment income to average daily net assets+.......       0.11%+         0.44%+
  Portfolio turnover rate...........................................       6.71%          6.71%
  Average commission rate...........................................  $  0.0108      $  0.0108
</TABLE>
 
- ------------------------
 
(1)  Select shares were first offered for sale to investors on October 29, 1996.
 
(a)  Calculated based on the average shares outstanding during the period.
 
*   Net of fees and expenses waived/reimbursed by the Manager and Administrator
    in the amount of $0.31 and $0.31, respectively.
 
**  Total return would have been lower had certain fees and expenses not been
    waived/reimbursed by the Manager and Administrator.
 
+   Computed on an annualized basis.
 
    Further information about the performance of the Funds is contained in the
Funds' semiannual and annual reports to shareholders, which may be obtained
without charge by writing or telephoning the Trust at the address and telephone
numbers stated on the cover of this Prospectus.
 
                                       7
<PAGE>
    The Funds' investment performance may from time to time be included in
advertisements about the Funds. Total return for a Fund is measured by comparing
the value of an investment in a Fund at the beginning of the relevant period to
the redemption value of the investment in such Fund at the end of such period
(assuming immediate reinvestment of any dividends or capital gain
distributions). All data are based on the Funds' past investment results and do
not predict future performance. Investment performance, which will vary, is
based on many factors, including market conditions, the composition of a Fund's
portfolio and a Fund's operating expenses. Investment performance also often
reflects the risks associated with a Fund's investment objectives and policies.
These factors should be considered when comparing a Fund's investment results
with those of other mutual funds and other investment vehicles. Quotations of
investment performance for any period when an expense limitation was in effect
will be greater than if the limitation had not been in effect.
 
                       INVESTMENT OBJECTIVES AND POLICIES
 
U.S. SMALL CAPITALIZATION SERIES
 
    The investment objective of the U.S. Small Capitalization Series is to seek
total return greater than that of the Russell 2000 Index through investment
primarily in equity securities of smaller companies that are traded principally
in the markets of the United States. Total return is a combination of capital
appreciation and current income (dividend or interest). In the case of the Fund,
total return will be measured by changes in value of an investment over a given
period, assuming that any dividends or capital gains distributions are
reinvested in the Fund rather than paid to the investor in cash. The Fund does
not seek to MAXIMIZE total return but, as indicated above, seeks a total return
greater than that of the common stocks referred to above. Because the companies
in which the Fund invests typically do not distribute significant amounts of
company earnings to shareholders, the Fund's objective will place relatively
greater emphasis on capital appreciation than on current income. The Fund's
investment objective is non-fundamental and thus may be changed by the Trustees
without shareholder approval.
 
    It is currently expected that, under normal circumstances, most of the
Fund's assets will be invested in common stocks of companies that are
principally traded in the markets of the United States and that have relatively
small total market capitalizations ("small capitalization securities"). The
definition of small capitalization securities may change from time to time to
correspond with the market capitalizations of companies (currently $1 billion or
less) defining the Russell 2000 Index as it may be adjusted from time to time.
Investments in issuers of small capitalization securities may present greater
opportunities for capital appreciation because of high potential earnings
growth, but may also involve greater risk. See "General Description of Risks and
Fund Investments -- Companies with Small Market Capitalizations" below.
 
    To meet redemptions or pending investments in common stocks, the Fund may
also temporarily hold a portion of its assets not invested in small
capitalization securities in full faith and credit obligations of the United
States government (e.g., U.S. Treasury Bills) and in short-term notes,
commercial paper or other money market instruments of high quality (i.e., rated
at least "A-2" or "AA" by Standard & Poor's ("S&P") or Prime 2 or "Aa" by
Moody's Investors Service, Inc. ("Moody's")) issued by companies having an
outstanding debt issue rated at least "AA" by S&P or at least "Aa" by Moody's,
or determined by the Manager to be of comparable quality to any of the
foregoing. The Fund may also invest in stock index futures. See "General
Description of Risks and Fund Investments -- Stock Index Futures" below.
 
                                       8
<PAGE>
    Also, the Fund may invest without limit in common stocks of foreign issuers
that are principally traded in the markets of the United States. Investments in
common stocks of foreign issuers may involve certain special risks due to
foreign economic, political and legal developments. See "General Description of
Risks and Fund Investments -- Special Considerations of Foreign Investments"
below. The Fund will not invest in securities which are principally traded
outside of the United States.
 
    FUNDAMENTAL POLICIES.  The Fund will normally invest most of its assets in
small capitalization securities, and it is a fundamental policy of the Fund,
which may not be changed without shareholder approval, that at least 65% of the
Fund's total assets will be invested in small capitalization securities.
 
INTERNATIONAL SMALL CAPITALIZATION SERIES
 
    The investment objective of the International Small Capitalization Series is
to seek total return greater than the Cazenove Rosenberg Global Smaller
Companies Index excluding the United States ("CRIEXUS") through investment
primarily in equity securities (i) that are traded principally in securities
markets outside of the United States and (ii) that represent interests in
companies with market capitalizations of between $15 million and $2 billion at
the time of purchase by the Fund. This corresponds with the current defining
range of market capitalization of companies in CRIexUS, which represents the
performance of companies in the lowest 15% by market capitalization in mature
markets other than the United States ("international small capitalization
companies"). The definition of international small capitalization companies may
change from time to time to correspond with the market capitalizations of
companies included in CRIexUS as it may be adjusted from time to time. Total
return is a combination of capital appreciation and current income (dividend or
interest). In the case of the Fund, total return will be measured by changes in
value of an investment over a given period, assuming that any dividends or
capital gains distributions are reinvested in the Fund rather than paid to the
investor in cash. The Fund does not seek to MAXIMIZE total return but, as
indicated above, seeks a total return greater than that of the common stocks
referred to above. Because the companies in which the Fund invests typically do
not distribute significant amounts of company earnings to shareholders, the
Fund's objective will place relatively greater emphasis on capital appreciation
than on current income. The Fund's investment objective is non-fundamental and
thus may be changed by the Trustees without shareholder approval.
 
    There are no prescribed limits on the Fund's geographic asset distribution,
and the Fund has the authority to invest in securities traded in securities
markets of any country in the world. It is currently expected that the Fund will
invest in approximately twenty-one different countries across three regions --
Europe, Pacific and North America (excluding the United States). Under certain
adverse investment conditions, the Fund may restrict the number of securities
markets in which its assets will be invested, although under normal market
circumstances, the Fund's investments will involve securities principally traded
in at least three different countries. See "General Description of Risks and
Fund Investments -- Special Considerations of Foreign Investments" below.
 
    Under normal circumstances, at least 90% of the Fund's total assets will be
invested in common stocks of international small capitalization companies and it
is the non-fundamental policy of the Fund to invest at least 65% of the Fund's
total assets in common stocks of international small capitalization companies.
Investments in such companies may present greater opportunities for capital
appreciation because of high potential
 
                                       9
<PAGE>
earnings growth, but may also involve greater risk. See "General Description of
Risks and Fund Investments -- Companies with Small Market Capitalizations"
below.
 
    The Fund will not normally invest in securities of United States issuers
traded on United States securities markets.
 
JAPAN SERIES
 
    The investment objective of the Japan Series is to seek total return greater
than that of the Tokyo Stock Price Index ("TOPIX") of the Tokyo Stock Exchange.
TOPIX is a capitalization weighted index of all stocks in the First Section of
the Tokyo Stock Exchange. Total return is a combination of capital appreciation
and current income (dividend or interest). The Fund will seek to meet this
objective primarily through investment in Japanese equity securities, primarily
in common stocks of Japanese companies. The Fund expects that any income it
derives will be from dividend or interest payments on securities. The Fund's
investment objective is non-fundamental and thus may be changed by the Trustees
without shareholder approval.
 
    It is currently expected that, under normal circumstances, the Fund will
invest at least 90% of its assets in "Japanese Securities," that is, securities
issued by entities ("Japanese Companies") that are organized under the laws of
Japan and that either have 50% or more of their assets in Japan or derive 50% or
more of their revenues from Japan. While the Fund will invest primarily in
common stocks of Japanese Companies, it may also invest in other Japanese
Securities, such as convertible preferred stock or debentures, warrants or
rights, as well as short-term government debt securities or other short-term
prime obligations (i.e., high quality debt obligations maturing not more than
one year from the date of issuance). The Fund will not ordinarily purchase
warrants or rights, although it may receive warrants or rights through
distributions on other securities it owns. In those cases, the Fund expects to
sell such warrants and rights within a reasonable period of time following their
distribution to the Fund. The Fund does not currently expect to own warrants or
rights with an aggregate value of greater than 5% of the Fund's assets.
 
    The Fund currently intends to make its investments in Japanese equity
securities, principally in well-established Japanese Companies that have an
active market for their shares. Japanese Companies will be considered
well-established if they have been subject for at least two years to the
financial accounting rules for a company whose securities are traded on a
Japanese securities exchange. In the discretion of the Fund's management, the
balance of the Fund's investments may be in companies that do not meet such
qualifications, although the nature of the market for the shares will always be
an important consideration in determining whether the Fund will invest in such
shares. The Fund anticipates that most Japanese equity securities in which it
will invest, either directly or indirectly (by means of convertible debentures),
will be listed on securities exchanges in Japan.
 
    INDEX FUTURES.  The Fund may also purchase futures contracts or options on
futures contracts on the Tokyo Stock Price Index ("TOPIX") or the NIKKEI 225
Index ("NIKKEI") for investment purposes. TOPIX futures are traded on the
Chicago Board of Trade and NIKKEI futures are traded on the Chicago Mercantile
Exchange. See "General Description of Risks and Fund Investments -- Stock Index
Futures" below.
 
    RISKS OF INVESTING IN JAPANESE SECURITIES.  Unlike other mutual funds which
invest in the securities of many countries, the Fund will invest almost
exclusively in Japanese Securities. Generally, the Manager will not vary the
percentage of the Fund's assets which are invested in Japanese Securities based
on its assessment
 
                                       10
<PAGE>
of Japanese economic, political or regulatory developments or changes in
currency exchange rates. However, the Manager has from time to time hedged up to
21% of the Fund's portfolio value and reserves the right to hedge up to 100% of
the Fund's total assets against a possible decline in the Japanese Securities
market by utilizing futures and options on futures on Japanese stock indices as
described above.
 
    Because a high percentage of the Fund's assets will be invested in Japanese
Securities, investment in the Fund will involve the general risks associated
with investing in foreign securities. See "General Description of Risks and Fund
Investments -- Special Considerations of Foreign Investments" below. In
addition, investors will be subject to the market risk associated with investing
almost exclusively in stocks of companies which are subject to Japanese economic
factors and conditions. Since the Japanese economy is dependent to a significant
extent on foreign trade, the relationships between Japan and its trading
partners and between the yen and other currencies are expected to have a
significant impact on particular Japanese companies and on the Japanese economy
generally. The Fund is designed for investors who are willing to accept the
risks associated with changes in such conditions and relationships.
 
    FUNDAMENTAL POLICIES.  The Fund will normally invest at least 90% of its
total assets in Japanese Securities, and it is a fundamental policy of the Fund,
which may not be changed without shareholder approval, that at least 65% of the
Fund's total assets will be invested in Japanese Securities.
 
               GENERAL DESCRIPTION OF RISKS AND FUND INVESTMENTS
 
    INVESTMENT RISKS.  An investment in the Funds involves risks similar to
those of investing in common stocks directly. Just as with common stocks, the
value of Fund shares may increase or decrease depending on market, economic,
political, regulatory and other conditions affecting a Fund's portfolio. These
types of risks may be greater with respect to investments in securities of
foreign issuers. Investment in shares of the Funds is, like investment in common
stocks, more volatile and risky than some other forms of investment.
 
    COMPANIES WITH SMALL MARKET CAPITALIZATIONS.  As specified above, the U.S.
Small Capitalization Series and the International Small Capitalization Series
will invest a relatively high percentage of their assets in companies with
relatively small market capitalizations. Companies with small market
capitalizations may be dependent upon a single proprietary product or market
niche, may have limited product lines, markets or financial resources, or may
depend on a limited management group. Typically, such companies have fewer
securities outstanding, which may be less liquid than securities of larger
companies. Their common stock and other securities may trade less frequently and
in limited volume and are generally more sensitive to purchase and sale
transactions. Therefore, the prices of such securities tend to be more volatile
than the prices of securities of companies with larger market capitalizations.
As a result, the absolute values of changes in the price of securities of
companies with small market capitalizations may be greater than those of larger,
more established companies.
 
    SPECIAL CONSIDERATIONS OF FOREIGN INVESTMENTS.  Investing in foreign
securities (i.e., those which are traded principally in markets outside of the
United States) involves certain risks not typically found in investing in U.S.
domestic securities. These include risks of adverse change in foreign economic,
political, regulatory and other conditions, and changes in currency exchange
rates, exchange control regulations (including currency blockage), expropriation
of assets or nationalization, imposition of withholding taxes on dividend or
interest payments, and possible difficulty in obtaining and enforcing judgments
against foreign entities. Furthermore,
 
                                       11
<PAGE>
issuers of foreign securities are subject to different, and often less
comprehensive, accounting, reporting and disclosure requirements than domestic
issuers. In certain countries, legal remedies available to investors may be more
limited than those available with respect to investments in the United States or
other countries. The laws of some foreign countries may limit a Fund's ability
to invest in securities of certain issuers located in those countries. The
securities of some foreign issuers and securities traded principally in foreign
securities markets are less liquid and at times more volatile than securities of
comparable U.S. issuers and securities traded principally in U.S. securities
markets. Foreign brokerage commissions and other fees are also generally higher
than those charged in the United States. There are also special tax
considerations which apply to securities of foreign issuers and securities
traded principally in foreign securities markets.
 
    The risks of investing in foreign securities may be intensified in the case
of investments in countries with limited or developing capital markets. Prices
of securities of companies in developing markets can be significantly more
volatile than prices of securities of companies in the more developed nations of
the world, reflecting the greater uncertainties of investing in less developed
markets and economies. In particular, countries with developing markets may have
relatively unstable governments, present the risk of nationalization of
businesses, restrictions on foreign ownership, or prohibitions of repatriation
of assets, and may have less protection of property rights than more developed
countries. The economies of countries with developing markets may be
predominantly based on only a few industries or dependent on revenues from
particular commodities or on international aid or development assistance, may be
highly vulnerable to changes in local or global trade conditions, and may suffer
from extreme and volatile debt burdens or inflation rates. Local securities
markets may trade a small number of securities and may be unable to respond
effectively to increases in trading volume, potentially making prompt
liquidation of substantial holdings difficult or impossible at times.
Consequently, securities of issuers located in countries with developing markets
may have limited marketability and may be subject to more abrupt or erratic
price movements. Also, such local markets typically offer less regulatory
protections for investors.
 
    FOREIGN EXCHANGE TRANSACTIONS.  The International Equity Portfolios of the
Trust (i.e., the International Small Capitalization Series and the Japan Series)
do not currently intend to hedge the foreign currency risk associated with
investments in securities denominated in foreign currencies. However, in order
to hedge against possible variations in foreign exchange rates pending the
settlement of securities transactions, the International Equity Portfolios
reserve the right to buy or sell foreign currencies or to deal in forward
foreign currency contracts; that is, to agree to buy or sell a specified
currency at a specified price and future date. The International Equity
Portfolios also reserve the right to purchase currency futures contracts and
related options thereon for similar purposes. For example, if the Manager
anticipates that the value of the yen will rise relative to the dollar, a Fund
could purchase a currency futures contract or a call option thereon or sell
(write) a put option to protect against a currency-related increase in the price
of yen-denominated securities such Fund intends to purchase. If the Manager
anticipates a fall in the value of the yen relative to the dollar, a Fund could
sell a currency futures contract or a call option thereon or purchase a put
option on such futures contract as a hedge. If the International Equity
Portfolios change their present intention and decide to utilize hedging
strategies, futures contracts and related options will be used only as a hedge
against anticipated currency rate changes (not for investment purposes) and all
options on currency futures written by a Fund will be covered. These practices,
if utilized, may present risks different from or in addition to the risks
associated with investments in foreign currencies.
 
                                       12
<PAGE>
    STOCK INDEX FUTURES.  A stock index futures contract (an "Index Future") is
a contract to buy an integral number of units of the relevant index at a
specified future date at a price agreed upon when the contract is made. A unit
is the value at a given time of the relevant index.
 
    In connection with a Fund's investment in common stocks, a Fund may invest
in Index Futures while the Manager seeks favorable terms from brokers to effect
transactions in common stocks selected for purchase. A Fund may also invest in
Index Futures when the Manager believes that there are not enough attractive
common stocks available to maintain the standards of diversity and liquidity set
for the Fund pending investment in such stocks when they do become available.
Through the use of Index Futures, a Fund may maintain a portfolio with
diversified risk without incurring the substantial brokerage costs which may be
associated with investment in multiple issuers. This may permit a Fund to avoid
potential market and liquidity problems (e.g., driving up or forcing down the
price by quickly purchasing or selling shares of a portfolio security) which may
result from increases or decreases in positions already held by a Fund. Certain
provisions of the Internal Revenue Code may limit this use of Index Futures. A
Fund may also use Index Futures in order to hedge its equity positions.
 
    In contrast to purchases of a common stock, no price is paid or received by
a Fund upon the purchase of a futures contract. Upon entering into a futures
contract, a Fund will be required to deposit with its custodian in a segregated
account in the name of the futures broker a specified amount of cash or
securities. This is known by participants in the market as "initial margin." The
type of instruments that may be deposited as initial margin, and the required
amount of initial margin, are determined by the futures exchange on which the
Index Futures are traded. The nature of initial margin in futures transactions
is different from that of margin in securities transactions in that futures
contract margin does not involve the borrowing of funds by the customer to
finance the transactions. Rather, the initial margin is in the nature of a
performance bond or good faith deposit on the contract which is returned to the
Fund upon termination of the futures contract, assuming all contractual
obligations have been satisfied. Subsequent payments, called "variation margin,"
to and from the broker, will be made on a daily basis as the price of the
particular Index fluctuates, making the position in the futures contract more or
less valuable, a process known as "marking to the market."
 
    A Fund may close out a futures contract purchase by entering into a futures
contract sale. This will operate to terminate the Fund's position in the futures
contract. Final determinations of variation margin are then made, additional
cash is required to be paid by or released to the Fund, and the Fund realizes a
loss or a gain.
 
    A Fund's use of Index Futures involves risk. Positions in Index Futures may
be closed out by a Fund only on the futures exchanges on which the Index Futures
are then traded. There can be no assurance that a liquid market will exist for
any particular contract at any particular time. The liquidity of the market in
futures contracts could be adversely affected by "daily price fluctuation
limits" established by the relevant futures exchange which limit the amount of
fluctuation in the price of an Index Futures contract during a single trading
day. Once the daily limit has been reached in the contract, no trades may be
entered into at a price beyond the limit. In such events, it may not be possible
for a Fund to close its futures contract purchase, and, in the event of adverse
price movements, a Fund would continue to be required to make daily cash
payments of variation margin. The futures market may also attract more
speculators than does the securities market, because deposit requirements in the
futures market are less onerous than margin requirements in the
 
                                       13
<PAGE>
securities market. Increased participation by speculators in the futures market
may also cause price distortions.
 
    A Fund will not purchase Index Futures if, as a result, the Fund's initial
margin deposits on transactions that do not constitute "bona fide hedging" under
relevant regulations of the Commodities Futures Trading Commission would be
greater than 5% of the Fund's total assets. In addition to margin deposits, when
a Fund purchases an Index Future, it is required to maintain, at all times while
an Index Future is held by the Fund, cash, U.S. Government securities or other
high grade liquid securities in a segregated account with its Custodian, in an
amount which, together with the initial margin deposit on the futures contract,
is equal to the current value of the futures contract.
 
    ILLIQUID SECURITIES.  Each Fund may purchase "illiquid securities," defined
as securities which cannot be sold or disposed of in the ordinary course of
business within seven days at approximately the value at which a Fund has valued
such securities, so long as no more than 15% of the Fund's net assets would be
invested in such illiquid securities after giving effect to the purchase.
Investment in illiquid securities involves the risk that, because of the lack of
consistent market demand for such securities, the Fund may be forced to sell
them at a discount from the last offer price.
 
    REPURCHASE AGREEMENTS.  Each Fund may enter into repurchase agreements, by
which a Fund purchases a security and obtains a simultaneous commitment from the
seller (a bank or, to the extent permitted by the 1940 Act, a recognized
securities dealer) to repurchase the security at an agreed-upon price and date
(usually seven days or less from the date of original purchase). The resale
price is in excess of the purchase price and reflects an agreed-upon market rate
unrelated to the coupon rate on the purchased security. Such transactions afford
a Fund the opportunity to earn a return on temporarily available cash. Although
the underlying security may be a bill, certificate of indebtedness, note or bond
issued by an agency, authority or instrumentality of the U.S. Government, the
obligation of the seller is not guaranteed by the U.S. Government and there is a
risk that the seller may fail to repurchase the underlying security. In such
event, a Fund would attempt to exercise rights with respect to the underlying
security, including possible disposition in the market. However, a Fund may be
subject to various delays and risks of loss, including (a) possible declines in
the value of the underlying security during the period while a Fund seeks to
enforce its rights thereto and (b) inability to enforce rights and the expenses
involved in attempted enforcement.
 
    PORTFOLIO TURNOVER.  Portfolio turnover is not a limiting factor with
respect to investment decisions. The rate of a Fund's portfolio turnover may
vary significantly from time to time depending on the volatility of economic and
market conditions. High portfolio turnover involves correspondingly greater
brokerage commissions and other transaction costs, which will be borne directly
by a Fund, and could involve realization of capital gains that would be taxable
when distributed to shareholders of such Fund. To the extent portfolio turnover
results in the realization of net short-term capital gains, such gains
ordinarily are taxed to shareholders at ordinary income tax rates. See "Taxes".
 
    LOANS OF PORTFOLIO SECURITIES.  Each Fund may lend some or all of its
portfolio securities to broker-dealers. Securities loans are made to
broker-dealers pursuant to agreements requiring that loans be continuously
secured by collateral in cash or U.S. Government securities at least equal at
all times to the market value of the securities lent. The borrower pays to the
lending Fund an amount equal to any dividends or interest received on the
securities lent. When the collateral is cash, the Fund may invest the cash
collateral
 
                                       14
<PAGE>
in interest-bearing, short-term securities. When the collateral is U.S.
Government securities, the Fund usually receives a fee from the borrower.
Although voting rights or rights to consent with respect to the loaned
securities pass to the borrower, a Fund retains the right to call the loans at
any time on reasonable notice, and it will do so in order that the securities
may be voted by the Fund if the holders of such securities are asked to vote
upon or consent to matters materially affecting the investment. A Fund may also
call such loans in order to sell the securities involved. The risks in lending
portfolio securities, as with other extensions of credit, include possible delay
in recovery of the securities or possible loss of rights in the collateral
should the borrower fail financially. However, such loans will be made only to
broker-dealers that are believed by the Manager to be of relatively high credit
standing.
 
    INVESTMENT POLICIES.  Except for investment policies which are explicitly
described as fundamental, the investment policies of each of the Funds may be
changed without shareholder approval. In addition to the policies described in
this Prospectus, please see the Statement of Additional Information for a
statement of fundamental and non-fundamental policies of the Funds.
 
                             INVESTMENT PERFORMANCE
 
MANAGER'S DISCUSSION OF U.S. SMALL CAPITALIZATION SERIES PERFORMANCE
 
    For the fiscal year ended March 31, 1997, the total return of the U.S. Small
Capitalization Series (Institutional Shares) was 19.53% after deduction of fees
and expenses, more than 14 percentage points above the total return of the
Russell 2000 Index. The Manager believes that the Fund's total return was the
result of the Manager's identification of undervalued U.S. small company stocks
combined with an overall rise in the market. In the last fiscal year, the prices
of the U.S. small company stocks selected by the Manager generally rose towards
the Manager's estimates of their fair value.
 
    The U.S. Small Capitalization Series has built a diversified portfolio that
closely tracks the risk factor and industry profile of the Russell 2000 Index
while emphasizing companies that are selling at prices below the Manager's
estimates of their fair value. The total return of the U.S. Small Capitalization
Series has exceeded the total return of the Russell 2000 Index since inception
of the Fund as well as in the latest 3- and 5- year fiscal periods of the Fund.
 
                                       15
<PAGE>
                        U.S. SMALL CAPITALIZATION SERIES
           (BASED ON THE PERFORMANCE OF INSTITUTIONAL SHARES ONLY)(1)
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<S>                                                   <C>                                        <C>
                                                           U.S. SMALL CAPITALIZATION SERIES (2)      RUSSELL 2000 INDEX
1989                                                                                1000000 (1)              $1,000,000
1990                                                                                  1,109,590               1,074,961
1991                                                                                  1,126,873               1,147,863
1992                                                                                  1,304,847               1,391,403
1993                                                                                  1,598,522               1,598,039
1994                                                                                  1,803,561               1,773,698
1995                                                                                  2,024,074               1,871,243
1996                                                                                  2,746,344               2,415,788
1997                                                                        3,282,825 Portfolio     2,539,511 Benchmark
Past performance is not predictive of future
performance.
</TABLE>
 
(1)  Based on minimum initial investment of $1,000,000 for Institutional Shares.
     Note that the minimum initial investment for Adviser Shares is $100,000 and
     for Select Shares is $2,500.
 
(2)  Fund returns are net of all fees while the Russell 2000 Index returns are
     based solely on market returns without deduction of fees or transaction
     costs for rebalancing.
 
            AVERAGE ANNUAL TOTAL RETURN (FOR PERIODS ENDED 3/31/97)
 
<TABLE>
<CAPTION>
                                                                                                                 SINCE INCEPTION
                                                                             1 YEAR      3 YEARS      5 YEARS       (2/22/89)
                                                                            ---------  -----------  -----------  ---------------
<S>                                                                         <C>        <C>          <C>          <C>
U.S. Small Capitalization Series (Institutional Shares)...................    19.53  %    22.10  %     20.26  %       15.79  %
 
Russell 2000 Index........................................................    5.12   %    12.71  %     12.79  %       12.10  %
</TABLE>
 
    THE NUMBERS REPORTED IN BOTH THE GRAPH AND THE TABLE REPRESENT PAST
PERFORMANCE AND ARE NOT PREDICTIVE OF FUTURE PERFORMANCE.
 
                                       16
<PAGE>
MANAGER'S DISCUSSION OF JAPAN SERIES PERFORMANCE
 
    During the last fiscal year, the total return of the Japan Series
(Institutional Shares) after deduction of fees and expenses was less than the
total return of its Tokyo Stock Price Index ("TOPIX") benchmark by approximately
1.5 percentage points. Most of the Fund's underperformance occurred during
November and December 1996. In those two months, the Fund underperformed TOPIX
by 2.94 percentage points primarily because high book-to-price stocks (value
stocks) performed poorly during this period. Since inception in January 1989,
the Fund has outperformed TOPIX by an average of .98 percentage points per year.
The Fund maintains a diversified portfolio of moderately undervalued securities
identified by the Manager's proprietary stock selection models.
 
                                  JAPAN SERIES
           (BASED ON THE PERFORMANCE OF INSTITUTIONAL SHARES ONLY)(1)
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
                                                      JAPAN SERIES (2)        TOPIX
<S>                                                   <C>               <C>
1989                                                       1000000 (1)          $1,000,000
1990                                                           825,963             760,601
1991                                                           842,011             759,691
1992                                                           664,446             582,912
1993                                                           759,076             686,635
1994                                                           913,564             847,235
1995                                                           994,336             845,399
1996                                                           982,039             882,838
                                                               700.383
1997                                                         Portfolio    642958 Benchmark
Past performance is not predictive of future
performance.
</TABLE>
 
(1)  Based on minimum initial investment of $1,000,000 for Institutional Shares.
     Note that the minimum initial investment for Adviser Shares is $100,000 and
     for Select Shares is $2,500.
 
(2)  Fund returns are net of all fees while the TOPIX Index returns are based
     solely on market returns without deduction of fees or transaction costs for
     rebalancing.
 
            AVERAGE ANNUAL TOTAL RETURN (FOR PERIODS ENDED 3/31/97)
 
<TABLE>
<CAPTION>
                                                                                                            SINCE INCEPTION
                                                                          1 YEAR     3 YEARS     5 YEARS       (1/3/89)
                                                                         ---------  ---------  -----------  ---------------
<S>                                                                      <C>        <C>        <C>          <C>
Japan Series (Institutional Shares)....................................   -28.68  %   -8.48  %    1.06   %       -4.23  %
 
TOPIX Index............................................................   -27.16  %   -8.78  %    1.98   %       -5.21  %
</TABLE>
 
                                       17
<PAGE>
    THE NUMBERS REPORTED IN BOTH THE GRAPH AND THE TABLES REPRESENT PAST
PERFORMANCE AND ARE NOT PREDICTIVE OF FUTURE PERFORMANCE.
 
MANAGER'S DISCUSSION OF INTERNATIONAL SMALL CAPITALIZATION SERIES PERFORMANCE
 
    From inception, September 23, 1996, to March 31, 1997 the total return of
the International Small Capitalization Series (Institutional Shares) after
deduction of fees and expenses was 1.30%. This exceeded the Fund's Cazenove
Rosenberg Global Smaller Companies Index excluding the U.S. ("CRIexUS")
benchmark by more than 2 percentage points. The Manager believes that the Fund's
total return was the result of identifying undervalued international small
company stocks. The Fund has built a diversified portfolio that closely tracks
the country and industry sectors of CRIexUS.(1)
 
- ------------------------
 
(1) CRIexUS includes 21 developed countries: Australia, Austria, Belgium,
    Canada, Denmark, Finland, France, Germany, Hong Kong, Ireland, Italy, Japan,
    Malaysia, Netherlands, New Zealand, Norway, Singapore, Spain, Sweden,
    Switzerland and U.K.
 
                   INTERNATIONAL SMALL CAPITALIZATION SERIES
            (BASED ON THE PERFORMANCE OF INSTITUTIONAL SHARES ONLY)
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<S>                                                   <C>                                                  <C>
                                                                INTERNATIONAL SMALL CAPITALIZATION SERIES               CRIexUS
9/23/1997                                                                                  $1,000,000 (1)            $1,000,000
9/30/1997                                                                                       1,002,000               999,999
                                                                                                  998,000               999,299
                                                                                                1,008,000             1,015,787
                                                                                                1,004,000             995,979.6
                                                                                                  999,000             991,198.9
                                                                                                1,017,000             1,005,770
3/31/1997                                                                             1,013,000 Portfolio   990,884.1 Benchmark
Past performance is not predictive of future
performance.
</TABLE>
 
*   Based on minimum initial investment of $1,000,000 for Institutional Shares.
    Note that the minimum initial investment for Adviser Shares is $100,000 and
    for Select Shares is $2,500.
 
**  Fund returns are net of all fees while the CRIexUS Index returns are based
    solely on market returns without deduction of fees or transaction costs for
    rebalancing.
 
                                       18
<PAGE>
               CUMULATIVE TOTAL RETURN (FOR PERIOD ENDED 3/31/97)
 
<TABLE>
<CAPTION>
                                                                                                       SINCE INCEPTION
                                                                                                          (9/23/96)
                                                                                                       ---------------
<S>                                                                                                    <C>
International Small Capitalization Series (Institutional Shares).....................................          1.30%
 
CRIexUS Index........................................................................................         -0.91%
</TABLE>
 
    THE NUMBERS REPORTED IN BOTH THE GRAPH AND THE TABLE REPRESENT PAST
PERFORMANCE AND ARE NOT PREDICTIVE OF FUTURE RESULTS.
 
                            MANAGEMENT OF THE TRUST
 
    Each Fund is advised and managed by Rosenberg Institutional Equity
Management (the "Manager") which provides investment advisory services to a
substantial number of institutional investors.
 
KEY PERSONNEL OF THE MANAGER
 
    The biography of each of the General Partners of the Manager, each of whom
is also a Trustee of the Trust, is set forth below.
 
    BARR ROSENBERG.  Dr. Rosenberg is Managing General Partner and Chief
Investment Officer of the Manager. As such, he has ultimate responsibility for
the Manager's securities valuation and portfolio optimization systems used to
manage the Funds and for the implementation of the decisions developed therein.
His area of special concentration is the design of the Manager's proprietary
securities valuation model.
 
    Dr. Rosenberg earned a B.A. degree from the University of California,
Berkeley, in 1963. He earned an M.Sc. from the London School of Economics in
1965, and a Ph.D. from Harvard University, Cambridge, Massachusetts, in 1968.
From 1968 until 1983, Dr. Rosenberg was a Professor of Finance, Econometrics,
and Economics at the School of Business Administration at the University of
California, Berkeley. Concurrently, from 1968 until 1974, Dr. Rosenberg worked
as a consultant in applied decision theory in finance, banking, and medicine. In
1975, he founded Barr Rosenberg Associates, a financial consulting firm (now
known as BARRA) where he was a managing partner, and later chief scientist. Dr.
Rosenberg, the founder of the Berkeley Program in Finance, is acknowledged as an
expert in the modeling of complex processes with substantial elements of risk.
 
    MARLIS S. FRITZ.  Ms. Fritz is a General Partner of the Manager. She has
primary responsibility for the Manager's new business development and secondary
responsibility for client service.
 
    Ms. Fritz earned a B.S. degree from the University of Michigan, Ann Arbor,
in 1971. After working in life insurance management and sales for seven years,
she entered the investment management business in 1978 as Marketing Associate
with Forstmann-Leff Associates, New York. From 1983 until 1985, she was Vice
President, Marketing at Criterion Investment Management Company, Houston, Texas.
 
    KENNETH REID.  Dr. Reid is a General Partner and Director of Research of the
Manager. His work is focused on the design and estimation of the Manager's
valuation models and he has primary responsibility for
 
                                       19
<PAGE>
analyzing the empirical evidence that validates and supports the day-to-day
recommendations of the Manager's securities valuation models. Patterns of
short-term price behavior discussed by Dr. Reid as part of his Ph.D.
dissertation have been refined and incorporated into the Manager's proprietary
valuation and trading systems.
 
    Dr. Reid earned both a B.A. degree (1973) and an M.D.S. (1975) from Georgia
State University, Atlanta. In 1982, he earned a Ph.D. from the University of
California, Berkeley, where he was awarded the American Bankers Association
Fellowship. From 1981 until June 1986, Dr. Reid worked as a consultant at BARRA
in Berkeley, California. His responsibilities included estimating
multiple-factor risk models, designing and evaluating active management
strategies, and serving as an internal consultant on econometric matters in
finance.
 
    There are 42 professional staff members of the Manager and the Manager's
affiliate, Barr Rosenberg Investment Management, Inc., located in Orinda,
California. Included among the Manager's professional staff are seven
individuals with Ph.D.s and eighteen individuals with other graduate degrees.
Five members of the staff have been awarded C.F.A. certificates.
 
THE OUTSIDE TRUSTEES
 
    William F. Sharpe and Nils H. Hakansson are Trustees of the Trust who are
not "interested persons" (as defined in the Investment Company Act of 1940, as
amended) of the Trust or the Manager.
 
    Dr. Sharpe is the STANCO 25 Professor of Finance at Stanford University's
Graduate School of Business. He is best known as one of the developers of the
Capital Asset Pricing Model, including the beta and alpha concepts used in risk
analysis and performance measurement. He developed the widely-used binomial
method for the valuation of options and other contingent claims. He also
developed the computer algorithm used in many asset allocation procedures. Dr.
Sharpe has published articles in a number of professional journals. He has also
written six books, including PORTFOLIO THEORY AND CAPITAL MARKETS, (McGraw-Hill,
1970), ASSET ALLOCATION TOOLS, (Scientific Press, 1987), FUNDAMENTALS OF
INVESTMENTS (with Gordon J. Alexander and Jeffery Bailey, Prentice-Hall, 1993)
and INVESTMENTS (with Gordon J. Alexander and Jeffery Bailey, Prentice-Hall,
1995). Dr. Sharpe is a past President of the American Finance Association. He
has also served as consultant to a number of corporations and investment
organizations. He is also a member of the Board of Trustees of Smith Breeden
Trust, an investment company, and a director at CATS Software and Stanford
Management Company. He received the Nobel Prize in Economic Sciences in 1990.
 
    Professor Hakansson is the Sylvan C. Coleman Professor of Finance and
Accounting at the Haas School of Business, University of California, Berkeley.
He is a former member of the faculty at UCLA as well as at Yale University. At
Berkeley, he served as Director of the Berkeley Program in Finance (1988-1991)
and as Director of the Professional Accounting Program (1985-1988). Professor
Hakansson is a Certified Public Accountant and spent three years with Arthur
Young & Company prior to receiving his Ph.D. from UCLA in 1966. He has twice
been a Visiting Scholar at Bell Laboratories in New Jersey and was, in 1975, the
Hoover Fellow at the University of New South Wales in Sydney and, in 1982, the
Chevron Fellow at Simon Fraser University in British Columbia. In 1984,
Professor Hakansson was a Special Visiting Professor at the Stockholm School of
Economics, where he was also awarded an honorary doctorate in economics. He is a
 
                                       20
<PAGE>
past president of the Western Finance Association (1983-1984). Professor
Hakansson has published numerous articles in academic journals and in
professional volumes. Many of his papers address various aspects of asset
allocation procedures as well as topics in securities innovation, information
economics, and financial reporting. He has served on the editorial boards of
several professional journals and been a consultant to the RAND Corporation and
a number of investment organizations. Professor Hakansson is a member of the
board of two foundations and a past board member of SuperShare Service
Corporation and of Theatrix Interactive, Inc. He is also a Fellow of the
Accounting Researchers International Association and a member of the Financial
Economists Roundtable.
 
THE MANAGER'S GENERAL INVESTMENT PHILOSOPHY AND STRATEGY
 
    The Manager attempts to add value relative to the designated benchmark
through a quantitative stock selection process, and seeks to diversify
investment risk across the several hundred holdings in each of the U.S. Small
Capitalization Series and the International Small Capitalization Series and the
holdings in the Japan Series. In seeking to outperform each Fund's designated
benchmark, the Manager also attempts to control risk in the Fund's portfolio
relative to the securities constituting that benchmark. Since each Fund is
substantially invested in equities at all times, the Manager does not earn the
extraordinary return, or "alpha," by timing the market. The Manager seeks to
avoid constructing portfolios that significantly differ from the relevant
benchmark with respect to characteristics such as market capitalization,
historic volatility or "beta," and industry weightings. Each Fund seeks to have
a similar exposure to these factors as the designated benchmark.
 
    INVESTMENT PHILOSOPHY.  The Manager's investment strategy is based on the
belief that stock prices imperfectly reflect the present value of the expected
future earnings of companies, their "fundamental value." The Manager believes
that market prices will converge towards fundamental value over time, and that
therefore, any investor who can accurately determine fundamental value, and who
applies a disciplined investment process to select those stocks that are
currently undervalued (i.e., the price is less than fundamental value), will
outperform the market over time.
 
    The premise of the Manager's investment philosophy is that there is a link
between the price of a stock and the underlying financial and operational
characteristics of the company. In other words, the price reflects the market's
assessment of how well the company is positioned to generate future earnings
and/or future cash flow. The Manager identifies and purchases those stocks which
are undervalued (i.e., they are currently cheaper than similar stocks with the
same characteristics). The Manager believes that the market will recognize the
"better value" and that the mispricing will be corrected as the stocks in the
Funds' portfolios are purchased by other investors.
 
    Determination of the relative valuation of a stock is based upon a
comparison of similar companies. In any group of similar companies, it is the
Manager's view that there are always some that are overvalued, some that are
undervalued, and some that are fairly-valued relative to the average valuation
for the group. These moderate valuation errors are believed to be present in
every sector of the market and can be identified through rigorous quantitative
analysis of fundamental data.
 
    In determining whether or not a stock is attractive, the Manager considers
the company's current estimated fundamental value as determined by the Manager's
proprietary Appraisal Model, the company's
 
                                       21
<PAGE>
future earnings, and investor sentiment toward the stock. The Manager identifies
and causes a Fund to purchase an undervalued stock and to hold it in the
relevant Fund's portfolio until the market recognizes and corrects for the
misvaluation. Each Fund's portfolio is composed of undervalued stocks from every
sector represented in such Fund's benchmark, with a typical portfolio consisting
of several hundred stocks.
 
    DECISION PROCESS.  The Manager's decision process is a continuum. Its
research function develops Models which analyze the 12,000 securities in the
global universe, both fundamentally and technically, and determines the risk
characteristics of the relevant Fund's benchmark. The portfolio management
function optimizes each portfolio's composition, executes trades, and monitors
performance and trading costs.
 
    The essence of the Manager's approach is rigorous attention to important
aspects of the investment process. Factors crucial to successful stock selection
include: (1) accurate and timely data on a large universe of companies; (2)
subtle quantitative descriptors of value and predictors of changes in value; and
(3) insightful definitions of similar businesses. The Manager takes great care
assimilating, checking and structuring the input data on which its Models rely.
The Manager believes that if the data is correct, the recommendations made by
the system will be sound.
 
    STOCK SELECTION.  Fundamental valuation of stocks is key to the Manager's
investment process, and the heart of the valuation process lies in the Manager's
proprietary Appraisal Model. Analysis of companies in the United States and
Canada is conducted in a single unified Model. The Appraisal Model discriminates
where the two markets are substantially different, while simultaneously
comparing companies in the two markets according to their degrees of similarity.
European companies and Asian companies (other than Japanese companies) are
analyzed in a nearly global Model, which includes the United States and Canada
as a further basis for comparative valuation, but which excludes Japan. Japanese
companies are analyzed in an independent national Model. The Model incorporates
the various accounting standards which apply in different markets and makes
adjustments to ensure meaningful comparisons.
 
    An important feature of the Appraisal Model is the classification of
companies into one or more of 166 groups of "similar" businesses. Currently, in
the United States, 160 groups are applicable; in Japan, 122 groups are
applicable; and in Europe, 154 groups are applicable. Each company is broken
down into its individual business segments, and each segment is compared with
similar business operations of other companies doing business in the same
geographical market. In most cases, the comparison is extended to include
companies with similar business operations in different markets. Subject to the
availability of data in different markets, the Manager appraises the company's
assets, operating earnings and sales within each business segment, accepting the
market's valuation of that category of business as fair. The Manager then
integrates the segment appraisals into balance sheet, income statement, and
sales valuation models for the total company, and simultaneously adjusts the
segment appraisals to include appraisals for variables which are declared only
for the total company, such as taxes, capital structure, and pension funding.
The result is a single valuation for each of the 12,000 companies followed.
 
    The difference between the Manager's appraisal and the market price is
believed to represent an opportunity for profit. For each stock, the Manager
develops "appraisal alphas" (i.e., the expected rate of extraordinary return) by
adjusting for the rate at which the market has corrected for such misvaluations
in the past.
 
                                       22
<PAGE>
    A second sphere of analysis is captured by the Manager's proprietary
Earnings Change Model, which analyzes more than 20 variables to predict
individual company earnings over a one year horizon. The variables are
fundamental and fall into three categories: measures of past profitability,
measures of company operations and consensus earnings forecasts. The Earnings
Change Model is independent of the Appraisal Model and projects the change in a
company's earnings in cents/current price. The value of the projected earnings
change is converted to an "earnings change alpha" by multiplying the projected
change by the market's historical response to changes of that magnitude.
 
    Finally, the Manager's proprietary Investor Sentiment Model quantifies
investor sentiment about features of stocks which influence price but which are
not captured by the Appraisal Model or the Earnings Change Model. This Model
measures company quality by looking at past price patterns and by predicting the
probability of deficient earnings. The Investor Sentiment Model also captures
market enthusiasm towards individual stocks by looking at broker recommendations
and analyst estimates. Investor sentiment alphas are developed by multiplying
the Model's sentiment scores by the market's historical response to such scores.
 
    Each company's earnings change alpha and investor sentiment alpha are added
to its appraisal alpha to arrive at a total company alpha. Stocks with large
positive total company alphas are candidates for purchase. Stocks held in a
portfolio with total company alphas that are only slightly positive, zero or
negative are candidates for sale.
 
    Before trading, the Manager systematically analyzes the short-term price
behavior of individual stocks to determine the timing of trades. The Investor
Sentiment Model quantifies investor enthusiasm for each stock by analyzing its
short-term performance relative to similar stocks, changes in analyst and broker
opinions about the stock, and earnings surprises. The Manager develops a
"trading alpha" for each stock (i.e., the expected short-term extraordinary
return) which is designed to enable the Funds to purchase stocks from supply and
to sell stocks into demand, greatly reducing trading costs.
 
    OPTIMIZATION.  The Manager's portfolio optimization system seeks to optimize
the trade-off between risk and reward relative to each Fund's benchmark. It
exploits the information developed by the Manager's stock selection Models to
maximize return relative to the benchmark, while avoiding a portfolio with
exposure to any other extraneous factors that would distinguish the Fund's
portfolio from the stocks constituting the relevant benchmark. Within the
geographic zone appropriate for each Fund, the optimizer recommends positions in
companies which in aggregate constitute the most efficient portfolio. The
optimizer simultaneously considers total company alphas, trading alphas, and
risk and quantifies the expected "net benefit" to the portfolio of each
recommended transaction. A stock is considered for sale when a higher alpha
stock with complementary risk characteristics has been identified. No
transaction will be executed unless the opportunity offered by the purchase
candidate sufficiently exceeds the potential of an existing holding to justify
the transaction costs. In most markets, portfolios are reoptimized continuously
throughout the day, allowing the Manager to respond immediately to investment
opportunities, subject to certain limitations on short-term trading applicable
by virtue of each Fund's intention to qualify as a regulated investment company
under the Internal Revenue Code.
 
    TRADING.  The Manager's trading system aggregates the recommended
transactions for each of the Funds and determines the feasibility of each
recommendation in light of the stock's liquidity, the expected transaction
costs, and general market conditions. It relays target price information to a
trader for each stock
 
                                       23
<PAGE>
considered for purchase or sale. Trades are executed through any one of four
trading strategies: traditional brokerage, networks, accommodation, and package
or "basket" trades.
 
    The network arrangements the Manager has developed with Instinet Matching
System (IMS), Portfolio System for Institutional Trading (POSIT), and the
Arizona Stock Exchange (AZX) facilitate large volume trading with little or no
price disturbance and low commission rates.
 
    Accommodative trading (which we also refer to as the Manager's "match
system") allows institutional buyers and sellers of stock to electronically
present the Manager with their "interest" lists each morning. Any matches
between the inventory which the brokers have presented and the Manager's own
recommended trades are signaled to the Manager's traders. Since the broker is
doing agency business and has a client on the other side of the trade, the
Manager expects that the other side will be accommodative in the price. The
Manager's objective in using this match system is to execute most trades on the
Manager's side of the bid/ask spread so as to minimize market impact.
 
    Package trades further allow the Manager to trade large lists of orders
simultaneously using state of the art tools such as the Instinet Real-Time
System, Instinet Order Matching System and Lattice Trading System. Those tools
provide order entry, negotiation and execution capabilities, either directly to
other institutions or electronically to the floor of the exchange. The
advantages of using such systems include speed of execution, low commissions,
anonymity and very low market impact.
 
    The Manager continuously monitors trading costs to determine the impact of
commissions and price disturbance on the Funds' portfolios.
 
INDIVIDUALS RESPONSIBLE FOR EACH FUND
 
    Each of the following General Partners of the Manager holds a greater than
5% interest in the Manager: Marlis S. Fritz and Kenneth Reid. Rosenberg Alpha
L.P., a California limited partnership, is a limited partner of the Manager and
holds a greater than 5% interest in the Manager. Barr M. Rosenberg, the Managing
General Partner of the Manager, and his wife, June Rosenberg, each holds a
greater than 5% general partnership interest in Rosenberg Alpha L.P.
 
    Management of the portfolio of each Fund is overseen by the Manager's
General Partners who are responsible for design and maintenance of the Manager's
portfolio system, and by a portfolio manager who is responsible for research and
monitoring each Fund's characteristic performance against the relevant benchmark
and for monitoring cash balances.
 
    U.S. SMALL CAPITALIZATION SERIES.  Dr. Rosenberg, Dr. Reid and Floyd
Coleman, the portfolio manager, are responsible, and have been responsible since
inception, for the day-to-day management of the U.S. Small Capitalization
Series' portfolio. Dr. Rosenberg and Dr. Reid both have been employed by the
Manager since 1985. Mr. Coleman has been a trader and portfolio manager for the
Manager since 1988. He received a B.S. from Northwestern University in 1982, a
M.S. from Polytechnic Institute, Brooklyn in 1984 and a M.B.A. from Harvard
Business School in 1988.
 
    JAPAN SERIES.  Dr. Rosenberg, Dr. Reid, and Cheng S. Liao, the portfolio
manager, are responsible, and have been responsible since inception, for the
day-to-day management of the Japan Series' portfolio.
 
                                       24
<PAGE>
Mr. Liao has been a senior research associate, programmer and portfolio manager,
specializing in the Japanese market with the Manager since 1989. Mr. Liao has
also been a trader for the Manager in Japanese securities since 1994. He
received a B.S. from Tohobu University, Japan, in 1984, a M.S. from Stanford
University in 1986, and a M.S. in Computer Science from Polytechnic Institute,
New York in 1988.
 
    INTERNATIONAL SMALL CAPITALIZATION SERIES.  Dr. Rosenberg, Dr. Reid and
Joseph Leung, the portfolio manager, are responsible, and have been responsible
since inception, for the day-to-day management of the International Small
Capitalization Series' portfolio. Mr. Leung has been a senior research
associate, programmer and portfolio manager with the Manager since 1993. He
received a B.S. and a B.A. from Queen's University, Ontario, Canada in 1989 and
a M.B.A. from the University of Chicago in 1993. Mr. Leung is a chartered
financial analyst.
 
MANAGEMENT CONTRACTS
 
    Under separate Management Contracts with the Trust on behalf of each Fund,
the Manager selects and reviews each Fund's investments and provides executive
and other personnel for the management of the Trust. Pursuant to the Trust's
Agreement and Declaration of Trust, as amended, the Board of Trustees supervises
the affairs of the Trust as conducted by the Manager. In the event that the
Manager ceases to be the manager of a Fund, the right of the Trust to use the
identifying name "Barr Rosenberg" and/or "Rosenberg" may be withdrawn.
 
    Each Fund will pay all other expenses incurred in the operation of such
Fund, including, but not limited to, brokerage commissions and transfer taxes in
connection with the Fund's portfolio transactions, all applicable taxes and
filing fees, distribution fees, shareholder servicing fees, the fees and
expenses for registration or qualification of its shares under the federal or
state securities laws, the compensation of trustees who are not partners,
officers or employees of the Manager, interest charges, expenses of issue or
redemption of shares, charges of custodians, auditing and legal expenses,
expenses of determining net asset value of Fund shares, reports to shareholders,
expenses of meetings of shareholders, expenses of printing and mailing
prospectuses, proxy statements and proxies to existing shareholders, insurance
premiums and professional association dues or assessments.
 
    In addition, each Fund has agreed to pay the Manager a quarterly management
fee at the annual percentage rate of the relevant Fund's average daily net
assets set forth below. The Manager has agreed to voluntarily waive some or all
of its management fee and, if necessary, to bear certain expenses of each Fund
until further notice to the extent required to limit the total annual operating
expenses (which do not include nonrecurring account fees and extraordinary
expenses) of each class of shares to the percentage of each
 
                                       25
<PAGE>
Fund's average daily net assets attributable to that class listed in the Expense
Limitation column below. The Manager's fee for management of each of the Funds
is higher than that paid by most other mutual funds.
 
<TABLE>
<CAPTION>
                                                                             CONTRACTUAL
                                                                         MANAGEMENT FEE (AS         EXPENSE LIMITATION
                                                                        A % OF AVERAGE DAILY        (AS A % OF AVERAGE
                                                                             NET ASSETS)             DAILY NET ASSETS)
                                                                   -------------------------------  -------------------
<S>                                                                <C>                              <C>
INSTITUTIONAL SHARES
  U.S. Small Capitalization Series...............................                  .90%                      1.15%
  Japan Series...................................................                 1.00%                      1.50%
  International Small Capitalization Series......................                 1.00%                      1.50%
ADVISER SHARES
  U.S. Small Capitalization Series...............................                  .90%                      1.40%
  Japan Series...................................................                 1.00%                      1.75%
  International Small Capitalization Series......................                 1.00%                      1.75%
SELECT SHARES
  U.S. Small Capitalization Series...............................                  .90%                      1.65%
  Japan Series...................................................                 1.00%                      2.00%
  International Small Capitalization Series......................                 1.00%                      2.00%
</TABLE>
 
ADMINISTRATOR, CUSTODIAN AND TRANSFER AGENT
 
    BISYS Fund Services ("BISYS" or the "Administrator"), a wholly-owned
subsidiary of The BISYS Group, Inc., serves as the Trust's administrator and
generally assists the Trust in all aspects of its administration and operation.
As compensation for its administrative services, BISYS receives a monthly fee
based upon an annual percentage rate of 0.15% of the aggregate average daily net
assets of the Funds.
 
    BISYS has also entered into an agreement with the Trust for the provision of
transfer agency services (and is referred to herein as the "Transfer Agent" in
such capacity) and dividend disbursing services for the Funds. The principal
business address of the Transfer Agent is 3435 Stelzer Road, Columbus, Ohio
43219.
 
    State Street Bank and Trust Company (the "Custodian") serves as custodian of
the assets of the Funds. The principal address of the Custodian is Mutual Funds
Division, Boston, Massachusetts 02102.
 
    A further discussion of the terms of the Trust's administrative arrangements
is contained in the Statement of Additional Information.
 
DISTRIBUTOR
 
    Adviser and Select Shares of each Fund are sold on a continuous basis by the
Company's distributor, Barr Rosenberg Funds Distributor, Inc. (the
"Distributor"), a wholly-owned subsidiary of BISYS. The Distributor's principal
offices are located at 3435 Stelzer Road, Columbus, Ohio 43219. Institutional
Shares are sold directly by the Funds.
 
    Solely for the purpose of compensating the Distributor for services and
expenses primarily intended to result in the sale of Select Shares of the Funds,
such shares are subject to an annual Distribution Fee of up to 0.50% of the
average daily net assets attributable to such shares in accordance with a
Distribution Plan (the
 
                                       26
<PAGE>
"Distribution Plan") adopted by the Trust pursuant to Rule 12b-1 under the 1940
Act. Currently, each Fund pays the Distributor an annual Distribution Fee of
0.25% of the Fund's average daily net assets attributable to Select Shares.
Activities for which the Distributor may be reimbursed include (but are not
limited to) the development and implementation of direct mail promotions and
advertising for the Funds, the preparation, printing and distribution of
prospectuses for the Funds to recipients other than existing shareholders, and
contracting with one or more wholesalers of the Funds' shares. The Distribution
Plan for Select Shares went into effect on August 5, 1996. The Distribution Plan
is of the type known as a "compensation" plan. This means that, although the
trustees of the Trust are expected to take into account the expenses of the
Distributor in their periodic review of the Distribution Plan, the fees are
payable to compensate the Distributor for services rendered even if the amount
paid exceeds the Distributor's expenses.
 
    The Distributor may also provide (or arrange for another intermediary or
agent to provide) personal and/or account maintenance services to Adviser and
Select shareholders of the Funds (the Distributor or such entity is referred to
as a "Servicing Agent" in such capacity). A Servicing Agent will be paid some or
all of the Shareholder Servicing Fees charged with respect to Adviser and Select
Shares of the Funds pursuant to Servicing Plans for such shares.
 
                                MULTIPLE CLASSES
 
    As indicated previously, the Funds offer three classes of shares to
investors, with eligibility generally depending on the amount invested in the
particular Fund and whether the investor makes the investment directly or
through a financial adviser. The three classes of shares are Institutional
Shares, Adviser Shares and Select Shares. The following table sets forth basic
investment and fee information for each class.
 
<TABLE>
<CAPTION>
                                  MINIMUM                                          ANNUAL         ANNUAL
                                   FUND       SUBSEQUENT        METHOD OF        SHAREHOLDER   DISTRIBUTION
NAME OF CLASS                   INVESTMENT*  INVESTMENTS*      INVESTMENT*       SERVICE FEE        FEE
- ------------------------------  -----------  ------------  -------------------  -------------  -------------
<S>                             <C>          <C>           <C>                  <C>            <C>
Institutional.................  $ 1 million   $   10,000   Direct                      None           None
Adviser.......................  $   100,000   $    1,000   Financial Adviser           .25%           None
Select........................  $     2,500   $      500   Direct                      .25%           .25%
</TABLE>
 
- ------------------------------
 
*  Certain exceptions apply. See "Institutional Shares", "Adviser Shares" and
"Select Shares" below."
 
    The offering price is based on the net asset value per share next determined
after an order is received. See "Purchase of Shares" and "Redemption of Shares."
 
INSTITUTIONAL SHARES
 
    Institutional Shares may be purchased by endowments, foundations and plan
sponsors of 401(a), 401(k), 457 and 403(b) plans and by individuals. In order to
be eligible to purchase Institutional Shares, an institution, plan or individual
must make an initial investment of at least $1 million in the particular Fund.
In its sole discretion, the Manager may waive this minimum investment
requirement and the Manager intends to do so for employees of the Manager, for
the spouse, parents, children, siblings, grandparents or grandchildren of such
employees, for employees of the Administrator and for Trustees of the Trust who
are not interested persons of the Trust or Manager and their spouses.
Institutional Shares are sold without any initial or deferred sales charges and
are not subject to any ongoing distribution expenses or shareholder servicing
fees.
 
                                       27
<PAGE>
ADVISER SHARES
 
    Adviser shares may be purchased solely through accounts established under a
fee-based program which is sponsored and maintained by a registered
broker-dealer or other financial adviser approved by the Trust's Distributor and
under which each investor pays a fee to the broker-dealer or other financial
adviser, or its affiliate or agent, for investment advisory or administrative
services. In order to be eligible to purchase Adviser Shares, a broker-dealer or
other financial adviser must make an initial investment of at least $100,000 of
its client's assets in the particular Fund. In its sole discretion, the Manager
may waive this minimum asset investment requirement. Adviser Shares are sold
without any initial or deferred sales charges and are not subject to ongoing
distribution expenses, but are subject to a Shareholder Service Fee at an annual
rate with respect to each Fund equal to 0.25% of the Fund's average daily net
assets attributable to Adviser Shares.
 
SELECT SHARES
 
    Select Shares may be purchased by intermediary financial institutions and
certain individual retirement accounts and individuals. In order to be eligible
to purchase Select Shares, an eligible investor must make an initial investment
of at least $2,500 in the particular Fund. In its sole discretion, the Manager
may waive this minimum investment requirement. Select Shares are subject to an
annual Shareholder Service Fee equal to 0.25% of the average daily net assets
attributable to Select Shares and an annual Distribution Fee equal to 0.25% of
the average daily net assets attributable to Select Shares. As described above,
the Distribution Plan for Select Shares permits payments of up to 0.50% of the
Funds' average daily net assets attributable to Select Shares.
 
GENERAL
 
    The Shareholder Service Fee charged with respect to Adviser Shares and
Select Shares is intended to be compensation for personal services rendered and
for account maintenance with respect to such shares. The Distribution Fee
charged with respect to Select Shares is intended to compensate the Distributor
for services and expenses primarily intended to result in the sale of Select
Shares.
 
    As described above, shares of the Funds may be sold to corporations or other
institutions such as trusts, foundations or broker-dealers purchasing for the
accounts of others ("Shareholder Organizations"). Investors purchasing and
redeeming shares of the Funds through a Shareholder Organization or through
financial advisers may be charged a transaction-based fee or other fee for the
services provided by the Shareholder Organization or financial adviser. Each
such Shareholder Organization and financial adviser is responsible for
transmitting to its customers a schedule of any such fees and information
regarding any additional or different conditions regarding purchases and
redemptions of Fund shares. Customers of Shareholder Organizations and financial
advisers should read this Prospectus in light of the terms governing accounts
with their particular organization.
 
                               PURCHASE OF SHARES
 
    The offering price for shares of each Fund is the net asset value per share
next determined after receipt of a purchase order. See "Determination of Net
Asset Value." Investors may be charged an additional fee by their broker or
agent if they effect transactions through such persons.
 
                                       28
<PAGE>
INITIAL CASH INVESTMENTS BY WIRE
 
    Subject to acceptance by the Trust, shares of each Fund may be purchased by
wiring federal funds. Please call 1-800-447-3332 for complete wiring
instructions. A completed Account Application must be overnighted to the Trust
at Barr Rosenberg Series Trust c/o BISYS Fund Services, Inc., 3435 Stelzer Road,
Columbus, Ohio 43219-8021. Notification must be given to the Trust at
1-800-447-3332 prior to 4:00 p.m., New York Time, of the wire date. Federal
funds purchases will be accepted only on a day on which the Trust, the
Distributor and the custodian bank are all open for business.
 
INITIAL CASH INVESTMENTS BY MAIL
 
    Subject to acceptance by the Trust, an account may be opened by completing
and signing an Account Application and mailing it to Barr Rosenberg Series
Trust, P.O. Box 182495, Columbus, Ohio 43219-2495.
 
    The Fund(s) to be purchased should be specified on the Account Application.
In all cases, subject to acceptance by the Trust, payment for the purchase of
shares received by mail will be credited to a shareholder's account at the net
asset value per share of the Fund next determined after receipt, even though the
check may not yet have been converted into federal funds.
 
ADDITIONAL CASH INVESTMENTS
 
    Additional cash investments may be made at any time by mailing a check to
the Trust at the address noted under "Initial Cash Investments by Mail" (payable
to Barr Rosenberg Series Trust) or by wiring monies as noted under "Initial Cash
Investments by Wire". Notification must be given at 1-800-447-3332 prior to 4:00
p.m., New York Time, of the wire date. The minimum amounts for additional cash
investments are $10,000 for Institutional Shares, $1,000 for Adviser Shares and
$500 for Select Shares.
 
INVESTMENTS IN-KIND (INSTITUTIONAL SHARES)
 
    Institutional Shares may be purchased in exchange for common stocks on
deposit at The Depository Trust Company ("DTC") or by a combination of such
common stocks and cash. Purchase of Institutional Shares of a Fund in exchange
for stocks is subject in each case to the determination by the Manager that the
stocks to be exchanged are acceptable. Securities accepted by the Manager in
exchange for Fund shares will be valued as set forth under "Determination of Net
Asset Value" (generally the last quoted sale price) as of the time of the next
determination of net asset value after such acceptance. All dividends,
subscription or other rights which are reflected in the market price of accepted
securities at the time of valuation become the property of the Fund and must be
delivered to the Fund upon receipt by the investor from the issuer. A gain or
loss for federal income tax purposes would be realized by investors subject to
federal income taxation upon the exchange, depending upon the investor's basis
in the securities tendered.
 
    The Manager will not approve the acceptance of securities in exchange for
Fund shares unless (1) the Manager, in its sole discretion, believes the
securities are appropriate investments for the Fund; (2) the investor represents
and agrees that all securities offered to the Fund are not subject to any
restrictions upon their sale by the Fund under the Securities Act of 1933, or
otherwise; and (3) the securities may be acquired under the Fund's investment
restrictions. In addition, portfolio securities acquired in exchange for Fund
 
                                       29
<PAGE>
shares will (1) be acquired for investment and not for resale; (2) be liquid
securities; and (3) have a readily ascertainable value.
 
OTHER PURCHASE INFORMATION
 
    An eligible shareholder may also participate in the Barr Rosenberg Automatic
Investment Program, an investment plan that automatically debits money from the
shareholder's bank account and invests it in Select Shares of one or more of the
Funds through the use of electronic funds transfers. Investors may commence
their participation in this program with a minimum initial investment of $2,500
and may elect to make subsequent investments by transfers of a minimum of $50
into their established Fund account. You may contact the Trust for more
information about the Barr Rosenberg Automatic Investment Program.
 
    For purposes of calculating the purchase price of Fund shares, a purchase
order is received by the Trust on the day that it is in "good order" unless it
is rejected by the Distributor. For a purchase order of Adviser Shares or Select
Shares to be in "good order" on a particular day a check or money wire must be
received on or before 4:00 p.m., New York Time of that day. In the case of
Institutional Shares, the investor's securities must be placed on deposit at the
Depository Trust Company prior to 10:00 a.m., New York Time or, in the case of
cash investments, the Trust must have received adequate assurances that federal
funds will be wired to the Fund prior to 4:00 p.m., New York Time, on the
following business day. If the consideration is received by the Trust after the
deadline, the purchase price of Fund shares will be based upon the next
determination of net asset value of Fund shares. No third party or foreign
checks will be accepted.
 
    The Trust reserves the right, in its sole discretion, to suspend the
offering of shares of its Funds or to reject purchase orders when, in the
judgment of the Manager, such suspension or rejection would be in the best
interests of the Trust.
 
    Purchases of a Fund's shares may be made in full or in fractional shares of
the Fund calculated to three decimal places. In the interest of economy and
convenience, certificates for shares will not be issued.
 
                                  IRA ACCOUNTS
 
    Select Shares of all Funds may be used as a funding medium for IRAs. The
minimum initial investment for an IRA is $2,000. A special application must be
completed in order to create such an account. Contributions to IRAs are subject
to prevailing amount limits set by the Internal Revenue Service. For more
information about IRAs, call the Trust at 1-800-447-3332.
 
                              REDEMPTION OF SHARES
 
    Shares of each Fund may be redeemed by mail, or, if authorized by an
investor in an account application, by telephone. The value of shares redeemed
may be more or less than the original cost of those shares, depending on the
market value of the investment securities held by the particular Fund at the
time of the redemption.
 
                                       30
<PAGE>
BY MAIL
 
    The Trust will redeem its shares at the net asset value next determined
after the request is received in "good order". See "Determination of Net Asset
Value." Requests should be addressed to Barr Rosenberg Series Trust, P.O. Box
182495, Columbus, Ohio 43219-2495.
 
    Requests in "good order" must include the following documentation:
 
        (a) a letter of instruction, if required, specifying the number of
    shares or dollar amount to be redeemed, signed by all registered owners of
    the shares in the exact names in which they are registered;
 
        (b) any required signature guarantees (see "Signature Guarantees"
    below); and
 
        (c) other supporting legal documents, if required, in the case of
    estates, trusts, guardianships, custodianships, corporations, pension and
    profit sharing plans and other organizations.
 
SIGNATURE GUARANTEES
 
    To protect shareholder accounts, the Trust and its transfer agent from
fraud, signature guarantees are required to enable the Trust to verify the
identity of the person who has authorized a redemption from an account.
Signature guarantees are required for (1) redemptions where the proceeds are to
be sent to someone other than the registered shareholder(s) at the registered
address, (2) redemptions of $25,000 or more, and (3) share transfer requests.
Signature guarantees may be obtained from certain eligible financial
institutions, including but not limited to, the following: banks, trust
companies, credit unions, securities brokers and dealers, savings and loan
associations and participants in the Securities and Transfer Association
Medallion Program ("STAMP"), the Stock Exchange Medallion Program ("SEMP") or
the New York Stock Exchange Medallion Signature Program ("MSP"). Shareholders
may contact the Trust at 1-800-447-3332 for further details.
 
BY TELEPHONE
 
    Provided the Telephone Redemption Option has been authorized by an investor
in an account application, a redemption of shares may be requested by calling
the Transfer Agent at 1-800-447-3332 and requesting that the redemption proceeds
be mailed to the primary registration address or wired per the authorized
instructions. If the Telephone Redemption Option or the Telephone Exchange
Option (as described below) is authorized, the Transfer Agent may act on
telephone instruction from any person representing himself or herself to be a
shareholder and believed by the Transfer Agent to be genuine. The Transfer
Agent's records of such instructions are binding and the shareholder, and not
the Trust or the Transfer Agent, bears the risk of loss in the event of
unauthorized instructions reasonably believed by the Transfer Agent to be
genuine. The Transfer Agent will employ reasonable procedures to confirm that
instructions communicated are genuine and, if it does not, it may be liable for
any losses due to unauthorized or fraudulent instructions. The procedures
employed in connection with transactions initiated by telephone include tape
recording of telephone instructions and requiring some form of personal
identification prior to acting upon instructions received by telephone.
Telephone Redemption will be suspended for a period of 10 days following a
telephonic address change.
 
                                       31
<PAGE>
SYSTEMATIC WITHDRAWAL PLAN
 
    An owner of $12,000 or more of shares of a Fund may elect to have periodic
redemptions made from the investor's account to be paid on a monthly, quarterly,
semiannual or annual basis. The maximum payment per year is 12% of the account
value at the time of the election. The shareholder will normally redeem a
sufficient number of shares to make the scheduled redemption payments on a date
selected by the shareholder. Depending on the size of the payment requested and
fluctuation in the net asset value, if any, of the shares redeemed, redemptions
for the purpose of making such payments may reduce or even exhaust the account.
A shareholder may request that these payments be sent to a predesignated bank or
other designated party. Capital gains and dividend distributions paid to the
account will automatically be reinvested at net asset value on the distribution
payment date.
 
FURTHER REDEMPTION INFORMATION
 
    Purchases of shares of the Trust made by check are not permitted to be
redeemed until payment of the purchase price has been collected, which may take
up to fifteen days after purchase. Shareholders can avoid this delay by
utilizing the wire purchase option.
 
    If the Manager determines, in its sole discretion, that it would not be in
the best interests of the remaining shareholders of a Fund to make a redemption
payment wholly or partly in cash, the Fund may pay the redemption price of
Institutional Shares in whole or in part by a distribution in kind of readily
marketable securities held by the relevant Fund in lieu of cash. Securities used
to redeem Fund shares in kind will be valued in accordance with the Fund's
procedures for valuation described under "Determination of Net Asset Value."
Securities distributed by the Fund in kind will be selected by the Manager in
light of the Fund's objective and will not generally represent a PRO RATA
distribution of each security held in the Fund's portfolio. Investors may incur
brokerage charges on the sale of any such securities so received in payment of
redemptions.
 
    The Trust may suspend the right of redemption and may postpone payment for
more than seven days when the New York Stock Exchange is closed for other than
weekends or holidays, or if permitted by the rules of the Securities and
Exchange Commission, during periods when trading on the Exchange is restricted
or during an emergency which makes it impracticable for the Funds to dispose of
their securities or to fairly determine the value of their net assets, or during
any other period permitted by the Securities and Exchange Commission for the
protection of investors.
 
                            EXCHANGE OF FUND SHARES
 
    The Funds offer two convenient ways to exchange shares in one Fund for
shares of another Fund in the Trust. Shares of a particular class of a Fund may
be exchanged only for shares of the same class in another Fund. There is no
sales charge on exchanges. Before engaging in an exchange transaction, a
shareholder should read carefully the information in the Prospectus describing
the Fund into which the exchange will occur. A shareholder may not exchange
shares of a class of one Fund for shares of the same class of another Fund that
is not qualified for sale in the state of the shareholder's residence. Although
the Trust has no current intention of terminating or modifying the exchange
privilege, it reserves the right to do so at any time.
 
                                       32
<PAGE>
Except as otherwise permitted by regulations of the Securities and Exchange
Commission, the Trust will give 60 days' advance notice to shareholders of any
termination or material modification of the exchange privilege.
 
    An exchange is taxable as a sale of a security on which a gain or loss may
be recognized. Shareholders should receive written confirmation of the exchange
within a few days of the completion of the transaction.
 
    A new account opened by exchange must be established with the same name(s),
address and social security number as the existing account. All exchanges will
be made based on the respective net asset values next determined following
receipt of the request by the Funds containing the information indicated below.
 
EXCHANGE BY MAIL
 
    To exchange Fund shares by mail, shareholders should simply send a letter of
instruction to the Trust. The letter of instruction must include: (a) the
investor's account number; (b) the class of shares to be exchanged; (c) the Fund
from and the Fund into which the exchange is to be made; (d) the dollar or share
amount to be exchanged; and (e) the signatures of all registered owners or
authorized parties.
 
EXCHANGE BY TELEPHONE
 
    To exchange Fund shares by telephone or to ask questions about the exchange
privilege, shareholders may call the Trust at 1-800-447-3332. If you wish to
exchange shares, please be prepared to give the telephone representative the
following information: (a) the account number, social security number and
account registration; (b) the class of shares to be exchanged; (c) the name of
the Fund from which and the Fund into which the exchange is to be made; and (d)
the dollar or share amount to be exchanged. Telephone exchanges are available
only if the shareholder so indicates by checking the "yes" box on the Account
Application. The Trust employs procedures, including recording telephone calls,
testing a caller's identity, and sending written confirmation of telephone
transactions, designed to give reasonable assurance that instructions
communicated by telephone are genuine, and to discourage fraud. To the extent
that a Fund does not follow such procedures, it may be liable for losses due to
unauthorized or fraudulent telephone instructions. A Fund will not be liable for
acting upon instructions communicated by telephone that it reasonably believes
to be genuine. The Trust reserves the right to suspend or terminate the
privilege of exchanging by mail or by telephone at any time. The telephone
exchange privilege will be suspended for a period of 10 days following a
telephonic address change.
 
                        DETERMINATION OF NET ASSET VALUE
 
    The net asset value of each class of shares of the Funds will be determined
once on each day on which the New York Stock Exchange is open as of 4:00 p.m.,
New York time. The net asset value per share of each class of a Fund is
determined by dividing the particular class's proportionate interest in the
total market value of the Fund's portfolio investments and other assets, less
any applicable liabilities, by the total outstanding shares of that class of the
Fund. Specifically, each Fund's liabilities are allocated among its classes. The
total of such liabilities allocated to a particular class plus that class's
shareholder servicing and/or distribution expenses, if any, and any other
expenses specially allocated to that class are then deducted from the class's
proportionate interest in the Fund's assets. The resulting amount for each class
is divided by the number of shares of that class outstanding to produce the "net
asset value" per share.
 
                                       33
<PAGE>
    Portfolio securities listed on a securities exchange for which market
quotations are available are valued at the last quoted sale price on each
business day, or, if there is no such reported sale, at the most recent quoted
bid price. Price information on listed securities is generally taken from the
closing price on the exchange where the security is primarily traded. Unlisted
securities for which market quotations are readily available are valued at the
most recent quoted bid price, except that debt obligations with sixty days or
less remaining until maturity may be valued at their amortized cost.
Exchange-traded options, futures and options on futures are valued at the
settlement price as determined by the appropriate clearing corporation. Other
assets and securities for which no quotations are readily available are valued
at fair value as determined in good faith by the Trustees of the Trust or by
persons acting at their direction.
 
                                 DISTRIBUTIONS
 
    Each Fund intends to pay out as dividends substantially all of its net
investment income (which comes from dividends and any interest it receives from
its investments and net realized short-term capital gains). Each Fund also
intends to distribute substantially all of its net realized long-term capital
gains, if any, after giving effect to any available capital loss carryover. Each
Fund's policy is to declare and pay distributions of its dividends and interest
annually although it may do so more frequently as determined by the Trustees of
the Trust. The Funds' policy is to distribute net realized short-term capital
gains and net realized long-term gains annually, although it may do so more
frequently as determined by the Trustees of the Trust to the extent permitted by
applicable regulations.
 
    All dividends and/or distributions will be paid out in the form of
additional shares of the Fund to which the dividends and/or distributions relate
at net asset value unless the shareholder elects to receive cash. Shareholders
may make this election by marking the appropriate box on the Account Application
or by writing to the Administrator.
 
    If you elect to receive distributions in cash and checks (1) are returned
and marked as "undeliverable" or (2) remain uncashed for six months, your cash
election will be changed automatically and your future dividend and capital
gains distributions will be reinvested in the Fund at the per share net asset
value determined as of the date of payment of the distribution. In addition, any
undeliverable checks or checks that remain uncashed for six months will be
canceled and will be reinvested in the Fund at the per share net asset value
determined as of the date of cancellation.
 
                                     TAXES
 
    Each Fund intends to qualify each year as a regulated investment company
under Subchapter M of the Internal Revenue Code of 1986, as amended. So long as
a Fund distributes substantially all of its dividend, interest and certain other
income, its net realized short-term capital gains and its net realized long-term
capital gains to its shareholders and otherwise qualifies for the special rules
governing the taxation of regulated investment companies, the Fund itself will
not pay federal income tax on the amount distributed. Dividend distributions
(I.E., distributions derived from interest, dividends and certain other income,
including, in general, short-term capital gains) will be taxable to shareholders
subject to income tax as ordinary income. Distributions of any long-term capital
gains are taxable as such to shareholders subject to income tax, regardless of
how long a shareholder may have owned shares in such Fund. A distribution paid
to shareholders by a Fund in January of a year is generally deemed to have been
received by shareholders on
 
                                       34
<PAGE>
December 31 of the preceding year, if the distribution was declared and payable
to shareholders of record on a date in October, November or December of that
preceding year. Each Fund will provide federal tax information annually,
including information about dividends and distributions paid during the
preceding year.
 
    If more than 50% of a Fund's assets at fiscal year-end is represented by
debt and equity securities of foreign corporations, the Fund may (and the Japan
Series and the International Small Capitalization Series intend to) elect to
permit shareholders who are U.S. citizens or U.S. corporations to claim a
foreign tax credit or deduction (but not both) on their U.S. income tax returns
for their PRO RATA portion of qualified taxes paid by the Fund to foreign
countries. As a result, the amounts of foreign income taxes paid by such Fund
would be treated as additional income to shareholders of such Fund for purposes
of the foreign tax credit. Each such shareholder would include in gross income
from foreign sources its PRO RATA share of such taxes. Certain limitations
imposed by the Internal Revenue Code may prevent shareholders from receiving a
full foreign tax credit or deduction for their allocable amount of such taxes.
 
    The foregoing is a general summary of the federal income tax consequences of
investing in a Fund to shareholders who are U.S. citizens or U.S. corporations.
Shareholders should consult their own tax advisers about the tax consequences of
an investment in the Funds in light of each shareholder's particular tax
situation. Shareholders should also consult their own tax advisers about
consequences under foreign, state, local or other applicable tax laws.
 
                DESCRIPTION OF THE TRUST AND OWNERSHIP OF SHARES
 
    The Trust is a diversified open-end series management investment company
organized as a Massachusetts business trust under the laws of The Commonwealth
of Massachusetts by an Agreement and Declaration of Trust dated April 1, 1988,
as amended from time to time (the "Declaration of Trust"). The U.S. Small
Capitalization Series commenced operations on or about September 13, 1988. The
Japan Series commenced operations on or about January 3, 1989. The International
Small Capitalization Series commenced operations on September 23, 1996.
 
    The Declaration of Trust permits the Trustees to issue an unlimited number
of full and fractional shares of beneficial interest which are presently divided
into three series. Interests in each of the Funds described in this Prospectus
are represented by shares of such Fund. The Declaration of Trust also permits
the Trustees, without shareholder approval, to subdivide any series of shares
into various sub-series of shares with such preferences and other rights as the
Trustees may designate. While the Trustees have no current intention to exercise
this power, it is intended to allow them to provide for an equitable allocation
of the impact of any future regulatory requirements which might affect various
classes of shareholders differently. The Trustees may also, without shareholder
approval, establish one or more additional separate portfolios for investments
in the Trust, terminate a series of the Trust or merge two or more existing
portfolios. Shareholders' investments in such a portfolio would be evidenced by
a separate series of shares.
 
    Each Fund is further divided into three classes of shares designated as
Institutional Shares, Adviser Shares and Select Shares. Each class of shares of
each Fund represents interests in the assets of that Fund and has identical
dividend, liquidation and other rights and the same terms and conditions except
that expenses, if any, related to the distribution and shareholder servicing of
a particular class are borne solely by such class and each class may, at the
Trustees' discretion, also pay a different share of other expenses, not
including
 
                                       35
<PAGE>
advisory or custodial fees or other expenses related to the management of the
Trust's assets, if these expenses are actually incurred in a different amount by
that class, or if the class receives services of a different kind or to a
different degree than the other classes. All other expenses are allocated to
each class on the basis of the net asset value of that class in relation to the
net asset value of the particular Fund.
 
    Each class of shares of each Fund has identical voting rights except that
each class has exclusive voting rights on any matter submitted to shareholders
that relates solely to that class, and has separate voting rights on any matter
submitted to shareholders in which the interests of one class differ from the
interests of any other class. Each class of shares has exclusive voting rights
with respect to matters pertaining to any distribution or servicing plan
applicable to that class. Matters submitted to shareholder vote must be approved
by each Fund separately except (i) when required by the Investment Company Act
of 1940, all shares shall be voted together and (ii) when the Trustees have
determined that the matter does not affect all Funds, then only shareholders of
the Fund or Funds affected shall be entitled to vote on the matter. All three
classes of shares of a Fund will vote together, except with respect to any
distribution or servicing plan applicable to a class or when a class vote is
required as specified above or otherwise by the Investment Company Act of 1940.
Shares are freely transferable, are entitled to dividends as declared by the
Trustees and, in liquidation of a Fund portfolio, are entitled to receive the
net assets of that portfolio, but not of the other Funds. The Trust does not
generally hold annual meetings of shareholders and will do so only when required
by law. Shareholders holding a majority of the outstanding shares may remove
trustees from office by votes cast in person or by proxy at a meeting of
shareholders or by written consent.
 
    The Declaration of Trust provides for the perpetual existence of the Trust.
The Trust, may, however, be terminated at any time by vote of at least
two-thirds of the outstanding shares of the Trust.
 
    Shareholders could, under certain circumstances, be held personally liable
for the obligations of the Trust. However, the risk of a shareholder incurring
financial loss on account of that liability is considered remote since it may
arise only in very limited circumstances.
 
    As of July 2, 1997, Rosenberg Institutional Equity Management may be deemed
to control the Japan Series and Charles Schwab & Co. Inc. may be deemed to
control the International Small Capitalization Series because such shareholders
possessed ownership, either directly or indirectly, of more than 25% of the
shares of such respective Funds.
 
                             SHAREHOLDER INQUIRIES
 
    Shareholders may direct inquiries to the Trust at Barr Rosenberg Series
Trust, P.O. Box 182495, Columbus, Ohio 43219-2495.
 
                                       36
<PAGE>
SHAREHOLDER SERVICES
1-800-447-3332 (Adviser and Select Share customers)
1-800-527-6026 (Institutional Share customers)
 
Additional Information may be found on the
World Wide Web at http://riem.com
 
BARR ROSENBERG SERIES TRUST
3435 Stelzer Road
Columbus, OH 43219
 
MANAGER
Rosenberg Institutional Equity Management
Four Orinda Way, Building E
Orindo, CA 94563
 
ADMINISTRATOR, TRANSFER AND DIVIDEND PAYING AGENT
BISYS Fund Services
3435 Stelzer Road
Columbus, OH 43219
 
DISTRIBUTOR
Barr Rosenberg Funds Distributor, Inc.
3435 Stelzer Road
Columbus, OH 43219
 
CUSTODIAN OF ASSETS
State Street Bank and Trust Company
Mutual Funds Division
Boston, MA 02102
 
INDEPENDENT ACCOUNTANTS
Price Waterhouse LLP
160 Federal Street
Boston, MA 02110
 
LEGAL COUNSEL
Ropes & Gray
One International Place
Boston, MA 02110-2624
 
                          BARR ROSENBERG SERIES TRUST
 
U.S. SMALL CAPITALIZATION SERIES
 
INTERNATIONAL SMALL CAPITALIZATION SERIES
 
JAPAN SERIES
 
PROSPECTUS
 
JULY 18, 1997

<PAGE>

                             BARR ROSENBERG SERIES TRUST

                           U.S. SMALL CAPITALIZATION SERIES
                      INTERNATIONAL SMALL CAPITALIZATION SERIES
                                     JAPAN SERIES


                         STATEMENT OF ADDITIONAL INFORMATION


                                    JULY 18, 1997
                                    --------------









THIS STATEMENT OF ADDITIONAL INFORMATION IS NOT A PROSPECTUS.  THIS STATEMENT 
OF ADDITIONAL INFORMATION RELATES TO THE PROSPECTUS OF BARR ROSENBERG SERIES 
TRUST DATED JULY 18, 1997 AND SHOULD BE READ IN CONJUNCTION THEREWITH.  A 
COPY OF THE PROSPECTUS MAY BE OBTAINED FROM BARR ROSENBERG SERIES TRUST, 3435 
STELZER ROAD, COLUMBUS, OHIO 43219.

<PAGE>


                                  TABLE OF CONTENTS

                                                                        PAGE
                                                                        ----

INVESTMENT OBJECTIVE AND POLICIES. . . . . . . . . . . . . . . . . . .    1

MISCELLANEOUS INVESTMENT PRACTICES . . . . . . . . . . . . . . . . . .    5

INVESTMENT RESTRICTIONS. . . . . . . . . . . . . . . . . . . . . . . .    6

INCOME DIVIDENDS, DISTRIBUTIONS AND TAX STATUS . . . . . . . . . . . .    8

MANAGEMENT OF THE TRUST. . . . . . . . . . . . . . . . . . . . . . . .    9

INVESTMENT ADVISORY AND OTHER SERVICES . . . . . . . . . . . . . . . .    11

PORTFOLIO TRANSACTIONS . . . . . . . . . . . . . . . . . . . . . . . .    15

TOTAL RETURN CALCULATIONS. . . . . . . . . . . . . . . . . . . . . . .    17

DESCRIPTION OF THE TRUST AND OWNERSHIP OF SHARES . . . . . . . . . . .    19

DETERMINATION OF NET ASSET VALUE . . . . . . . . . . . . . . . . . . .    22

FINANCIAL STATEMENTS . . . . . . . . . . . . . . . . . . . . . . . . .    22

<PAGE>

                          INVESTMENT OBJECTIVE AND POLICIES


The investment objective and policies of each of the U.S. Small Capitalization
Series, the International Small Capitalization Series and the Japan Series (each
a "Fund" and collectively, the "Funds") of Barr Rosenberg Series Trust (the
"Trust") are summarized on the front page of the Prospectus and in the text of
the Prospectus under the headings "Investment Objectives and Policies" and
"General Description of Risks and Fund Investments."

In addition, the following investment objectives and policies apply to the Fund
or Funds indicated.

INDEX FUTURES  (ALL FUNDS).  An index futures contract (an "Index Future") is a
contract to buy or sell an integral number of units of an Index at a specified
future date at a price agreed upon when the contract is made.  A unit is the
value of the relevant Index from time to time.  Entering into a contract to buy
units is commonly referred to as buying or purchasing a contract or holding a
long position in an Index.

Index Futures contracts can be traded through all major commodity brokers.
Currently, contracts are expected to expire on the tenth day of March, June,
September and December. A Fund will ordinarily be able to close open positions
on the United States futures exchange on which Index Futures are then traded
at any time up to and including the expiration day.

As noted in the Prospectus, upon entering into a futures contract, a Fund will
be required to deposit initial margin with its custodian in a segregated account
in the name of the futures broker.  Variation margin will be paid to and
received from the broker on a daily basis as the contracts are marked to market.
For example, when a Fund has purchased an Index Future and the price of the
relevant Index has risen, that position will have increased in value and the
Fund will receive from the broker a variation margin payment equal to that
increase in value.  Conversely, when a Fund has purchased an Index Future and
the price of the relevant Index has declined, the position would be less
valuable and the Fund would be required to make a variation margin payment to
the broker.

The price of Index Futures may not correlate perfectly with movement in the
underlying Index due to certain market distortions.  First, all participants in
the futures market are subject to margin deposit and maintenance requirements.
Rather than meeting additional margin deposit requirements, investors may close
futures contracts through offsetting transactions which could distort the normal
relationship between the Index and futures markets.  Secondly, the deposit
requirements in the futures market are less onerous than margin requirements in
the securities market, and as a result the futures market may attract more
speculators than does the securities market.  Increased participation by
speculators in the futures market may also cause temporary price distortions.
In addition, with respect to the Japan Series, trading hours for Index Futures
may not correspond perfectly to hours of trading on the Tokyo Stock Exchange.
This may result in a disparity between the price of Index Futures and the value
of the underlying Index due to the lack of continuous arbitrage between the
Index Futures price and the value of the underlying Index.

FOREIGN CURRENCY TRANSACTIONS (INTERNATIONAL SMALL CAPITALIZATION SERIES AND
JAPAN SERIES).  As is disclosed in the Prospectus following the heading "General
Description of Risks and Fund Investments," the Funds do not currently intend to
hedge the foreign currency risk associated with investments in securities
denominated in foreign currencies.  However, the Funds reserve the right to buy
or sell foreign currencies or to deal in forward foreign currency contracts to
hedge against possible variations in foreign exchange rates pending the
settlement of securities transactions.  The Funds also reserve the right to use

                                       1

<PAGE>

currency futures contracts and related options thereon for similar purposes.  By
entering into a futures or forward contract for the purchase or sale, for a
fixed amount of dollars, of the amount of foreign currency involved in the
underlying security transactions, a Fund will be able to protect itself against
a possible loss resulting from an adverse change in the relationship between the
U.S. dollar and the subject foreign currency during the period between the date
on which the security is purchased or sold and the date on which payment is made
or received.  A Fund's dealing in forward contracts will be limited to this type
of transaction.  A Fund will not engage in currency futures transactions for
leveraging purposes.  A put option on a futures contract gives a Fund the right
to assume a short position in the futures contract until the expiration of the
option.  A call option on a futures contract gives a Fund the right to assume a
long position in the futures contract until the expiration of the option.

CURRENCY FORWARD CONTRACTS (INTERNATIONAL SMALL CAPITALIZATION SERIES AND JAPAN
SERIES).  A forward foreign currency exchange contract involves an obligation to
purchase or sell a specific currency at a future date, which may be any fixed
number of days from the date of the contract as agreed by the parties, at a
price set at the time of the contract.  In the case of a cancelable forward
contract, the holder has the unilateral right to cancel the contract at maturity
by paying a specified fee.  The contracts traded in the interbank market are
negotiated directly between currency traders (usually large commercial banks)
and their customers.  A forward contract generally has no deposit requirement,
and no commissions are charged at any stage for trades.

CURRENCY FUTURES TRANSACTIONS (INTERNATIONAL SMALL CAPITALIZATION SERIES AND
JAPAN SERIES).  A currency futures contract sale creates an obligation by the
seller to deliver the amount of currency called for in the contract in a
specified delivery month for a stated price.  A currency futures contract
purchase creates an obligation by the purchaser to take delivery of the
underlying amount of currency in a specified delivery month at a stated price.
Futures contracts are traded only on commodity exchanges -- known as "contract
markets" -- approved for such trading by the Commodity Futures Trading
Commission ("CFTC"), and must be executed through a futures commission merchant,
or brokerage firm, which is a member of the relevant contract market.

Although futures contracts by their terms call for actual delivery or
acceptance, in most cases the contracts are closed out before the settlement
date without the making or taking of delivery.  Closing out a futures contract
sale is effected by purchasing a futures contract for the same aggregate amount
of the specific type of financial instrument or commodity and the same delivery
date.  If the price of the initial sale of the futures contract exceeds the
price of the offsetting purchase, the seller is paid the difference and realizes
a gain.  Conversely, if the price of the offsetting purchase exceeds the price
of the initial sale, the seller realizes a loss.  Similarly, the closing out of
a futures contract purchase is effected by the purchaser entering into a futures
contract sale.  If the offsetting sale price exceeds the purchase price, the
purchaser realizes a gain, and if the purchase price exceeds the offsetting sale
price, the purchaser realizes a loss.

The purchase or sale of a futures contract differs from the purchase or sale of
a security, in that no price or premium is paid or received.  Instead, an amount
of cash or U.S. Treasury bills generally not exceeding 5% of the contract amount
must be deposited with the broker.  This amount is known as initial margin.
Subsequent payments to and from the broker, known as variation margin, are made
on a daily basis as the price of the underlying futures contract fluctuates
making the long and short positions in the futures contract more or less
valuable, a process known as "marking to the market."  At any time prior to the
settlement date of the futures contract, the position may be closed out by
taking an opposite position which will operate to terminate the position in the
futures contract.  A final determination of variation

                                       2

<PAGE>

margin is then made, additional cash is required to be paid to or released by
the broker, and the purchaser realizes a loss or gain.  In addition, a
commission is paid on each completed purchase and sale transaction.

Unlike a currency futures contract, which requires the parties to buy and sell
currency on a set date, an option on a futures contract entitles its holder to
decide on or before a future date whether to enter into such a contract.  If the
holder decides not to enter into the contract, the premium paid for the option
is lost.  Since the value of the option is fixed at the point of sale, there are
no daily payments of cash in the nature of "variation" or "maintenance" margin
payments to reflect the change in the value of the underlying contract as there
are by a purchaser or seller of a currency futures contract.

The ability to establish and close out positions on options on futures will be
subject to the development and maintenance of a liquid secondary market.  It is
not certain that this market will develop or be maintained.

The Funds will write (sell) only covered put and call options on currency
futures.  This means that a Fund will provide for its obligations upon exercise
of the option by segregating sufficient cash or short-term obligations or by
holding an offsetting position in the option or underlying currency future, or a
combination of the foregoing.  Set forth below is a description of methods of
providing cover that the Funds currently expect to employ, subject to applicable
exchange and regulatory requirements.  If other methods of providing appropriate
cover are developed, a Fund reserves the right to employ them to the extent
consistent with applicable regulatory and exchange requirements.

A Fund will, so long as it is obligated as the writer of a call option on
currency futures, own on a contract-for-contract basis an equal long position in
currency futures with the same delivery date or a call option on currency
futures with the difference, if any, between the market value of the call
written and the market value of the call or long currency futures purchased
maintained by the Fund in cash, U.S. Government securities, or other high-grade
liquid debt obligations in a segregated account with its custodian.  If at the
close of business on any day the market value of the call purchased by a Fund
falls below 100% of the market value of the call written by the Fund, the Fund
will so segregate an amount of cash, U.S. Government securities, or other
high-grade liquid debt obligations equal in value to the difference.
Alternatively, a Fund may cover the call option through segregating with its
custodian an amount of the particular foreign currency equal to the amount of
foreign currency per futures contract option times the number of options written
by the Fund.

In the case of put options on currency futures written by a Fund, the Fund will
hold the aggregate exercise price in cash, U.S. Government securities, or other
high-grade liquid debt obligations in a segregated account with its custodian,
or own put options on currency futures or short currency futures, with the
difference, if any, between the market value of the put written and the market
value of the puts purchased or the currency futures sold maintained by the Fund
in cash, U.S. Government securities, or other high-grade liquid debt obligations
in a segregated account with its custodian.  If at the close of business on any
day the market value of the put options purchased or the currency futures sold
by a Fund falls below 100% of the market value of the put options written by the
Fund, the Fund will so segregate an amount of cash, U.S. Government securities,
or other high-grade liquid debt obligations equal in value to the difference.

                                       3

<PAGE>

A Fund may not enter into currency futures contracts or related options
thereon if immediately thereafter the amount committed to margin plus the amount
paid for premiums for unexpired options on currency futures contracts exceeds 5%
of the market value of the Fund's total assets.

LIMITATIONS ON THE USE OF CURRENCY FUTURES CONTRACTS (INTERNATIONAL SMALL
CAPITALIZATION SERIES AND JAPAN SERIES).  A Fund's ability to engage in the
currency futures transactions described above will depend on the availability of
liquid markets in such instruments.  Markets in currency futures are relatively
new and still developing.  It is impossible to predict the amount of trading
interest that may exist in various types of currency futures.  Therefore no
assurance can be given that a Fund will be able to utilize these instruments
effectively for the purposes set forth above.  Furthermore, a Fund's ability to
engage in such transactions may be limited by tax considerations.

RISK FACTORS IN CURRENCY FUTURES TRANSACTIONS (INTERNATIONAL SMALL
CAPITALIZATION SERIES AND JAPAN SERIES).  Investment in currency futures
contracts involves risk.  Some of that risk may be caused by an imperfect
correlation between movements in the price of the futures contract and the price
of the currency being hedged.  The hedge will not be fully effective where there
is such imperfect correlation.  To compensate for imperfect correlations, a Fund
may purchase or sell futures contracts in a greater amount than the hedged
currency if the volatility of the hedged currency is historically greater than
the volatility of the futures contracts.  Conversely, a Fund may purchase or
sell fewer contracts if the volatility of the price of the hedged currency is
historically less than that of the futures contracts.  The risk of imperfect
correlation generally tends to diminish as the maturity date of the futures
contract approaches.

The successful use of transactions in futures and related options also depends
on the ability of the Manager to forecast correctly the direction and extent of
exchange rate and stock price movements within a given time frame.  It is
impossible to forecast precisely what the market value of securities a Fund
anticipates buying will be at the expiration or maturity of a currency forward
or futures contract.  Accordingly, in cases where a Fund seeks to protect
against an increase in value of the currency in which the securities are
denominated through a foreign currency transaction, it may be necessary for the
Fund to purchase additional foreign currency on the spot market (and bear the
expense of such currency purchase) if the market value of the securities to be
purchased is less than the amount of foreign currency the Fund contracted to
purchase.  Conversely, it may be necessary to sell on the spot market some of
the foreign currency received upon the sale of the portfolio security or
securities if the market value of such security or securities exceeds the value
of the securities purchased.  When a Fund purchases forward or futures contracts
(or options thereon) to hedge against a possible increase in the price of
currency in which is denominated the securities the Fund anticipates purchasing,
it is possible that the market may instead decline.  If a Fund does not then
invest in such securities because of concern as to possible further market
decline or for other reasons, the Fund may realize a loss on the forward or
futures contract that is not offset by a reduction in the price of the
securities purchased.  As a result, a Fund's total return for such period may be
less than if it had not engaged in the forward or futures transaction.

Foreign currency transactions that are intended to hedge the value of securities
a Fund contemplates purchasing do not eliminate fluctuations in the underlying
prices of those securities.  Rather, such currency transactions simply establish
a rate of exchange which can be used at some future point in time.
Additionally, although these techniques tend to minimize the risk of loss due to
a change in the value of the currency involved, they tend to limit any potential
gain that might result from the increase in the value of such currency.

                                       4

<PAGE>

The amount of risk a Fund assumes when it purchases an option on a currency
futures contract is the premium paid for the option plus related transaction
costs.  In addition to the correlation risks discussed above, the purchase of an
option also entails the risk that changes in the value of the underlying futures
contract will not be fully reflected in the value of the option purchased.

The liquidity of a secondary market in a currency futures contract may be
adversely affected by "daily price fluctuation limits" established by commodity
exchanges which limit the amount of fluctuation in a futures contract price
during a single trading day.  Once the daily limit has been reached in the
contract, no trades may be entered into at a price beyond the limit, thus
preventing the liquidation of open futures positions.  Prices have in the past
exceeded the daily limit on a number of consecutive trading days.

A Fund's ability to engage in currency forward and futures transactions may be
limited by tax considerations.

WARRANTS (JAPAN SERIES).  The Japan Series may from time to time purchase
warrants; however, not more than 5% of its net assets (at the time of purchase)
will be invested in warrants other than warrants acquired in units or attached
to other securities.  Of such 5%, not more than 2% of such net assets at the
time of purchase may be invested in warrants that are not listed on the New York
Stock Exchange or American Stock Exchange.  Warrants have no voting rights, pay
no dividends and have no rights with respect to the assets of the corporation
issuing them.  Warrants represent options to purchase equity securities of an
issuer at a specific price for a specific period of time.  They do not represent
ownership of such securities, but only the right to buy them.

                      MISCELLANEOUS INVESTMENT PRACTICES 

PORTFOLIO TURNOVER.  A change in securities held by a Fund is known as 
"portfolio turnover" and almost always involves the payment by the Fund of 
brokerage commissions or dealer markup and other transaction costs on the 
sale of securities as well as on the reinvestment of the proceeds in other 
securities. Portfolio turnover is not a limiting factor with respect to 
investment decisions.  Although the rate of portfolio turnover is difficult 
to predict, it is not anticipated that under normal circumstances the annual 
portfolio turnover rate for the International Small Capitalization Series 
will exceed 100%.  It is, however, impossible to predict portfolio turnover 
in future years.  The portfolio turnover rate for the U.S. Small 
Capitalization Series for the fiscal years ended March 31, 1996 and 1997 was 
71.87% and 126.83%, respectively.  An increase in the number of Fund shares 
sold was the primary reason for the increase in the portfolio turnover rate 
of the U.S. Small Capitalization Series for the fiscal year ended March 31, 
1997. The portfolio turnover rate for the Japan Series for the fiscal years 
ended March 31, 1996 and 1997 was 60.60% and 51.70%, respectively.  As 
disclosed in the Prospectus, high portfolio turnover involves correspondingly 
greater brokerage commissions and other transaction costs, which will be 
borne directly by the Fund, and could involve realization of capital gains 
that would be taxable when distributed to shareholders of a Fund.  To the 
extent that portfolio turnover results in the realization of net short-term 
capital gains, such gains are ordinarily taxed to shareholders at ordinary 
income tax rates.

NOTICE ON SHAREHOLDER APPROVAL

 Unless otherwise indicated in the Prospectus or this Statement of Additional
Information, the investment objective and policies of each of the Funds may be
changed without shareholder approval.

                                       5

<PAGE>

                               INVESTMENT RESTRICTIONS

Without a vote of the majority of the outstanding voting securities of a Fund,
the Trust will not take any of the following actions with respect to such Fund:

(1)  Borrow money in excess of 10% of the value (taken at the lower of cost or
current value) of the Fund's total assets (not including the amount borrowed) at
the time the borrowing is made, and then only from banks as a temporary measure
to facilitate the meeting of redemption requests (not for leverage) which might
otherwise require the untimely disposition of portfolio investments or for
extraordinary or emergency purposes.  Such borrowings will be repaid before any
additional investments are purchased.

(2)  Pledge, hypothecate, mortgage or otherwise encumber its assets in excess of
10% of the Fund's total assets (taken at cost) and then only to secure
borrowings permitted by Restriction 1 above.  (For the purposes of this
restriction, collateral arrangements with respect to options, stock index,
interest rate, currency or other futures, options on futures contracts and
collateral arrangements with respect to initial and variation margin are not
deemed to be a pledge or other encumbrance of assets.  With respect to the
International Small Capitalization Series and the Japan Series, collateral
arrangements with respect to swaps and other derivatives are also not deemed to
be a pledge or other encumbrance of assets.)

(3)  Purchase securities on margin, except such short-term credits as may be
necessary for the clearance of purchases and sales of securities.  (For this
purpose, the deposit or payment of initial or variation margin in connection
with futures contracts or related options transactions is not considered the
purchase of a security on margin.)

(4)  Make short sales of securities or maintain a short position for the Fund's
account unless at all times when a short position is open the Fund 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.

(5)  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.

(6) Purchase or sell real estate, although it may purchase securities of issuers
which deal in real estate, including securities of real estate investment
trusts, and may purchase securities which are secured by interests in real
estate.

(7)  Concentrate more than 25% of the value of its total assets in any one
industry.

(8)  Invest in securities of other investment companies, except to the extent
permitted by the Investment Company Act of 1940, as amended (the "1940 Act").
Under the 1940 Act, no registered investment company may generally (a) invest
more than 10% of its total assets (taken at current value) in securities of
other investment companies, (b) own securities of any one investment company
having a value in excess of 5% of its total assets (taken at current value), or
(c) own more than 3% of the outstanding voting stock of any one investment
company.)

(9)  Purchase or sell commodities or commodity contracts except that each of the
Funds may purchase and sell foreign currency, currency futures contracts and
options thereon, stock index and other financial futures contracts and options
thereon.

                                       6

<PAGE>

(10)  Make loans, except by purchase of debt obligations or by entering into
repurchase agreements or through the lending of the Fund's portfolio securities.

(11)  Issue senior securities.  (For the purpose of this restriction none of the
following is deemed to be a senior security:  any pledge or other encumbrance of
assets permitted by restriction (2) above; any borrowing permitted by
restriction (1) above; any collateral arrangements with respect to options,
future contracts and options on future contracts and with respect to initial and
variation margin; and the purchase or sale of options, forward contracts, future
contracts or options on future contracts.)

Notwithstanding the latitude permitted by Restrictions 1, 2, 3, 4 and 9
above, the Funds have no current intention of (a) borrowing money, (b)
purchasing interest rate futures or (c) entering into short sales.

It is contrary to the present policy of each Fund, which may be changed by the
Trustees of the Trust without shareholder approval, to:

(a)  With the exception of the Japan Series, invest in warrants or rights (other
than warrants or rights acquired by the Fund as a part of a unit or attached to
securities at the time of purchase).

(b)  Write, purchase or sell options on particular securities (as opposed to
market indices or currencies).

(c)  Buy or sell oil, gas or other mineral leases, rights or royalty contracts.

(d)  Make investments for the purpose of exercising control of a company's
management.

(e)  Invest in (a) securities which at the time of investment are not readily
marketable, (b) securities the disposition of which is restricted under the
federal securities laws, and (c) repurchase agreements maturing in more than
seven days if, as a result, more than 15% of the Fund's net assets (taken at
current value) would then be invested in securities described in (a), (b) and
(c) above.

(f) With respect to 75% of its total assets, invest in a security if, as a
result of such investment, it would hold more than 10% (taken at the time of
such investment) of the outstanding voting securities of any one issuer, except
that this restriction does not apply to securities issued or guaranteed by the
U.S. Government or its agencies or instrumentalities.

Unless otherwise indicated, all percentage limitations on investments set forth
herein and in the Prospectus will apply at the time of the making of an
investment and shall not be considered violated unless an excess or deficiency
occurs or exists immediately after and as a result of such investment.

The phrase "shareholder approval," as used in the Prospectus and herein, and 
the phrase "vote of a majority of the outstanding voting securities," as used
herein, means the affirmative vote of the lesser of (1) more than 50% of the
outstanding shares of a Fund or the Trust, as the case may be, or (2) 67% or
more of the shares of a Fund or the Trust, as the case may be, present at a
meeting if more than 50% of the outstanding shares are represented at the
meeting in person or by proxy.

                                       7

<PAGE>

                    INCOME DIVIDENDS, DISTRIBUTIONS AND TAX STATUS

The tax status of the Funds and the distributions which they may make are
summarized in the Prospectus under the heading "Taxes."  The Funds intend to
qualify each year as a regulated investment company under the Internal Revenue
Code.  In order to qualify as a "regulated investment company," each Fund must,
among other things, (a) derive at least 90% of its gross income from dividends,
interest, payments with respect to certain securities loans, gains from the sale
or other disposition of securities or foreign currencies or other income
(including but not limited to gains from options, futures or forward contracts)
derived with respect to its business of investing in such securities or
currencies; (b) derive less than 30% of its gross income from the sale or the
other disposition of securities and certain other assets held less than three
months; (c) diversify its holdings so that, at the close of each quarter of its
taxable year, (i) at least 50% of the value of its total assets consists of
cash, cash items, U.S. Government securities, securities of other regulated
investment companies, and other securities limited generally with respect to any
one issuer to not more than 5% of the total assets of such Fund and not more
than 10% of the outstanding voting securities of such issuer, and (ii) not more
than 25% of the value of its assets is invested in the securities of any issuer
(other than U.S. Government securities or securities of other regulated
investment companies); and (d) distribute annually at least 90% of its dividend,
interest and certain other income (including, in general, short-term capital
gains).  To the extent a Fund qualifies for treatment as a regulated investment
company, the Fund will not be subject to federal income tax on income paid to
its shareholders in the form of dividends or capital gain distributions.

The Japan Series and the International Small Capitalization Series may be
subject to foreign withholding taxes on income and gains derived from foreign
investments.  Such taxes would reduce the yield on such Funds' investments, but,
as discussed in the Prospectus, may be taken as either a deduction or a credit
by U.S. citizens and corporations. Investment by either Fund in certain 
"passive foreign investment companies" could subject the Fund to a 
U.S. federal income tax or other charge on distributions received from, or on
the sale of its investment in, such a company. Such a tax cannot be eliminated
by making distributions to Fund shareholders.  If such Fund elects to treat a
passive foreign investment company as a "qualified electing fund," different
rules will apply, although the Fund does not expect to be in the position to
make such elections.

As described in the Prospectus under the heading "Distributions," each Fund
intends to pay out substantially all of its ordinary income and net realized
short-term capital gains, and to distribute substantially all of its net
realized capital gains, if any, after giving effect to any available capital
loss carryover.  Net realized capital gain is the excess of net realized
long-term capital gain over net realized short-term capital loss.  Under the Tax
Reform Act of 1986, in order to avoid an excise tax imposed on certain
undistributed income, a Fund must distribute prior to each calendar year end
without regard to the Fund's fiscal year end (i) 98% of the Fund's ordinary
income, and (ii) 98% of the Fund's capital gain net income, if any, realized in
the one-year period ending on October 31.

In general, all dividend distributions derived from ordinary income and
short-term capital gain are taxable to investors as ordinary income (eligible in
part for the dividends-received deduction in the case of corporations) and
long-term capital gain distributions are taxable to investors as long-term
capital gains, whether such dividends or distributions are received in shares or
cash.  The dividends-received deduction for corporations will generally apply to
a Fund's dividends from investment income to the extent derived from dividends
received by the Fund from domestic corporations.

                                       8

<PAGE>

Certain tax exempt organizations or entities may not be subject to federal
income tax on dividends or distributions from a Fund.  Each organization or
entity should review its own circumstances and the federal tax treatment of its
income.

Each Fund is generally required to withhold and remit to the U.S. Treasury 20%
of all dividends from net investment income and capital gain distributions,
whether distributed in cash or reinvested in shares of the Fund, paid or
credited to any shareholder account for which an incorrect or no taxpayer
identification number has been provided or where the Fund is notified that the
shareholder has under-reported income in the past (or the shareholder fails to
certify that he is not subject to such withholding).  In addition, the Fund will
generally be required to withhold and remit to the U.S. Treasury 20% of the
amount of the proceeds of any redemption of Fund shares from a shareholder
account for which an incorrect or no taxpayer identification number has been
provided.  However, the general back-up withholding rules set forth above will
not apply to tax exempt entities so long as each such entity furnishes the Fund
with an appropriate certificate.

To the extent such investments are permissible for a particular Fund, the Fund's
transactions in options, futures contracts, hedging transactions, forward
contracts, straddles and foreign currencies will be subject to special tax rules
(including mark-to-market, straddle, wash sale and short sale rules), the effect
of which may be to accelerate income to the Fund, defer losses to the Fund,
cause adjustments in the holding periods of the Fund's securities and convert
short-term capital losses into long-term capital losses. These rules could
therefore affect the amount, timing and character of distributions to
shareholders.

                               MANAGEMENT OF THE TRUST

The Trustees and officers of the Trust and their principal occupations during
the past five years are as follows:

   
Kenneth Reid* (47)                   General Partner and Director
President, Trustee                   of Research, Rosenberg Institutional Equity
                                     Management, June, 1986 to present.

Marlis S. Fritz* (47)                General Partner and Director of
Vice President, Trustee              Marketing, Rosenberg Institutional Equity
                                     Management, April, 1985 to present.

Nils H. Hakansson (60)               Sylvan C. Coleman Professor of
Trustee                              Finance and Accounting,
                                     Haas School of Business, University of 
                                     California, Berkeley, June, 1969 to 
                                     present.  Director, Supershare Services 
                                     Corporation (investment management), Los 
                                     Angeles, California, November, 1989
    

                                       9

<PAGE>
                                     to present.

Barr M. Rosenberg* (54)              Managing General Partner and
Trustee                              Chief Investment Officer, Rosenberg 
                                     Institutional Equity Management, January,
                                     1985 to present.

William F. Sharpe (63)               Timken Professor of Finance,
Trustee                              Stanford University, September, 1970 to 
                                     September, 1989. Timken Professor Emeritus
                                     of Finance, Stanford University, October, 
                                     1989 to present.  Chairman, William F. 
                                     Sharpe Associates, Los Altos, California
                                     (research and financial consulting), 
                                     March, 1986 to present.

Po-Len Hew (31)                      Accounting Manager, Rosenberg
Treasurer                            Institutional Equity Management, October, 
                                     1989 to present.

Carolyn Demler (53)                  Administrative Coordinator, Rosenberg
Clerk                                Institutional Equity Management, December, 
                                     1988 to present.

Edward H. Lyman (53)                 Executive Vice President, Barr Rosenberg
Vice President and                   Investment Management, Inc., and General
General Counsel                      Counsel to the Rosenberg Group of
                                     companies, 1990 to present.

Richard L. Saalfeld (54)             President and Chief Executive Officer
Vice President                       of mutual fund unit of Rosenberg 
                                     Institutional Equity Management from 
                                     June 1996 to present; Consultant to 
                                     Rosenberg Institutional Equity 
                                     Management, September 1995 to May 1996; 
                                     Chairman and Chief Executive Officer of 
                                     CoreLink Resources, Inc. (mutual fund
                                     marketing organization), Concord, 
                                     California, April 1993 to August 1995. 

Harold L. Arbit (50)                 Vice President and Partner, Rosenberg
Vice President                       Alpha, 1984 to present.

David Bunstine (32)                  Employee of BISYS Fund Services.
Assistant Treasurer

Bruce Treff (31)                     Employee of BISYS Fund Services.
Assistant Clerk

Ellen Stoutamire (48)                Employee of BISYS Fund Services.
Assistant Clerk

Jeanette Peplowski (39)              Employee of BISYS Fund Services.
Assistant Clerk

Alaina Metz (31)                     Employee of BISYS Fund Services.
Assistant Clerk

*Trustees who are "interested persons" (as defined in the 1940 Act) of the Trust
  or the Manager. 

The mailing address of each of the officers and Trustees is
c/o Barr Rosenberg Series Trust, 3435 Stelzer Road, Columbus, OH 43219.

The principal occupations of the officers and Trustees for the last five years
have been with the employers as shown above, although in some cases they have
held different positions with such employers.

                                       10

<PAGE>

The Trust pays the Trustees other than those who are interested persons of 
the Trust or Manager an annual fee of $23,000 plus $2,500 for each meeting 
attended. The Trust does not pay any pension or retirement benefits for its 
Trustees.  The Trust does not pay any compensation to officers or Trustees of 
the Trust other than those Trustees who are not interested persons of the 
Trust or Manager.  The following table sets forth information concerning the 
total compensation paid to each of the Trustees who are not interested 
persons of the Trust or Manager in the fiscal year ended March 31, 1997. 

<TABLE>
<CAPTION>

(1)                     (2)                 (3)                 (4)                 (5)

                                                                                    Total
                                            Pension or                              Compensation
                                            Retirement                              from Registrant
                        Aggregate           Benefits Accrued    Estimated Annual    and Fund
Name of Person          Compensation        as Part of Fund     Benefits Upon       Complex Paid
Position                from Registrant     Expenses            Retirement          to Directors
- -----------------       ---------------     ----------------    ----------------    ---------------

<S>                     <C>                 <C>                 <C>                 <C>
Nils H. Hakansson       $33,000             $0                  $0                  $33,000
Trustee

William F. Sharpe       $33,000             $0                  $0                  $33,000
Trustee

</TABLE>

    Messrs. Rosenberg, Reid, Arbit, Lyman and Saalfeld and Ms. Fritz, 
Demler and Hew, each being a general partner, limited partner, officer or 
employee of the Manager, will each benefit from the management fees paid by 
the Trust to the Manager, but receive no direct compensation from the Trust. 

                        INVESTMENT ADVISORY AND OTHER SERVICES

MANAGEMENT CONTRACTS

    As disclosed in the Prospectus under the heading "Management of the Trust,"
under management contracts (each a "Management Contract") between the Trust, on
behalf of each Fund, and Rosenberg Institutional Equity Management (the
"Manager"), subject to the control of the Trustees of the Trust and such
policies as the Trustees may determine, the Manager will furnish continuously an
investment program for each Fund and will make investment decisions on behalf of
each Fund and place all orders for the purchase and sale of portfolio
securities.  Subject to the control of the Trustees, the Manager furnishes
office space and equipment, provides bookkeeping and certain clerical services
and pays all salaries, fees and expenses of officers and Trustees of the Trust
who are affiliated with the Manager.  As indicated under "Portfolio Transactions
- -- Brokerage and Research Services," the Trust's portfolio transactions may be
placed with broker-dealers which furnish the Manager, at no cost, certain
research, statistical and quotation services of value to the Manager in advising
the Trust or its other clients.

    As is disclosed in the Prospectus, each of the Funds has agreed to pay the
Manager a quarterly management fee at the annual percentage rate of the relevant
Fund's average daily net assets set forth in the Prospectus.  The Manager has
informed the Trust that it will voluntarily waive some or all of its management
fees under the Management Contracts and, if necessary, will bear certain
expenses of each Fund until further notice so that such Fund's total annual
operating expenses (including the management fee but not including nonrecurring
account fees and extraordinary expenses) applicable to each class will not
exceed the percentage of such Fund's average daily net assets attributable to
that class as set forth in the Prospectus.  In addition, the Manager's
compensation under each Management Contract is subject to reduction to the
extent that in any year the expenses of a Fund (including investment advisory
fees but
                                       11
<PAGE>

   
excluding taxes, portfolio brokerage commissions and any distribution expenses
paid by a class of shares of a Fund pursuant to a distribution plan or
otherwise) exceed the limits on investment company expenses imposed by any
statute or regulatory authority of any jurisdiction in which shares of the Fund
are qualified for offer and sale.
    

    Each Management Contract provides that the Manager shall not be subject to
any liability to the Trust or to any shareholder of the Trust in connection with
the performance of its services thereunder in the absence of willful
misfeasance, bad faith, gross negligence or reckless disregard of its
obligations and duties thereunder.

    Each Management Contract will continue in effect for a period no more than
two years from the date of its execution only so long as its continuance is
approved at least annually by (i) vote, cast in person at a meeting called for
that purpose, of a majority of those Trustees who are not "interested persons"
of the Manager or the Trust, and by (ii) the majority vote of either the full
Board of Trustees or the vote of a majority of the outstanding shares of the
relevant Fund.  Each Management Contract automatically terminates on assignment,
and is terminable on not more than 60 days' notice by the Trust to the Manager.
In addition, each Management Contract may be terminated on not more than 60
days' written notice by the Manager to the Trust.

    As disclosed in the Prospectus, the general partners of the Manager are
Barr M. Rosenberg, Marlis S. Fritz and Kenneth Reid.  Each of these persons may
be deemed a controlling person of the Manager.

    As discussed in this Statement of Additional Information under the 
heading "Management of the Trust," Barr M. Rosenberg is a Trustee of the 
Trust as well as Managing General Partner and Chief Investment Officer of the 
Manager; Marlis S. Fritz is a Trustee and Vice President of the Trust as well 
as a general partner of the Manager; and Kenneth Reid is a Trustee and 
President of the Trust as well as a general partner and Director of Research 
of the Manager.

    During the last three fiscal years, the U.S. Small Capitalization Series
has paid the following amounts as management fees to the Manager pursuant to its
Management Contract:

                                       12
<PAGE>

                     Gross        Reduction             Net
                   --------       ---------          --------

4/1/94 - 3/31/95   $427,746       $148,971           $278,775

4/1/95 - 3/31/96   $514,386       $157,913           $356,473

4/1/96 - 3/31/97   $544,082       $307,646           $236,436

During the last three fiscal years, the Japan Series has paid the following
amounts as management fees to the Manager pursuant to its Management Contract:

                        Gross          Reduction      Net
                       --------        ---------      ---

4/1/94 - 3/31/95       $ 12,148        $ 12,148       -0-

4/1/95 - 3/31/96       $ 12,093        $ 12,093       -0-

4/1/96 - 3/31/97       $ 12,153        $ 12,153       -0-

For the period from commencement of operations, the International Small
Capitalization Series has paid the following amounts as management fees to the
Manager pursuant to its Management Contract:

                        Gross          Reduction      Net
                       --------        ---------      ---

9/23/96 - 3/31/97      $ 35,711        $ 35,711       -0-

ADMINISTRATIVE SERVICES

The Trust has entered into a Fund Administration Agreement with BISYS 
Fund Services ("BISYS") pursuant to which BISYS provides certain management 
and administrative services necessary for the Funds' operations including:  
(i) general supervision of the operation of the Funds including coordination 
of the services performed by the Funds' investment advisor, transfer agent, 
custodian, independent accountants and legal counsel, regulatory compliance, 
including the compilation of information for documents such as reports to, 
and filings with, the SEC and state securities commissions, and preparation 
of proxy statements and shareholder reports for the Funds; (ii) general 
supervision relative to the compilation of data required for the preparation 
of periodic reports distributed to the Funds' officers and Board of Trustees; 
and (iii) furnishing office space and certain facilities required for 
conducting the business of the Funds.  The Trust's principal underwriter is 
an affiliate of BISYS.  For these services, BISYS is entitled to receive a 
fee, payable monthly, at the annual rate of 0.15% of the average daily net 
assets of the Funds for each Fund.  For the fiscal year ended March 31, 1997 
the U.S. Small Capitalization Series, Japan Series and the International 
Small Capitalization Series paid $81,281, $1,535 and $5,357 in administration 
fees, respectively.  The Trust has also entered into a Fund Accounting 
Agreement with Bisys Fund Services, Inc. (the "Fund Accountant") pursuant to 
which the Fund Accountant provides certain accounting services necessary for 
the Funds' operations. For these services, the Fund Accountant is entitled to 
receive an annual fee of $30,000 for each Fund.  For the fiscal year ended 
March 31, 1997 the U.S. Small Capitalization Series, Japan Series and the 
International Small Capitalization Series paid $61,341, $35,771 and $62,686 
in fund accounting fees, respectively. 

                                       13

<PAGE>

DISTRIBUTOR AND DISTRIBUTION PLAN

    As stated in the text of the Prospectus under the heading "Management of
the Trust-Distributor," Adviser and Select Shares of each Fund are sold on a
continuous basis by the Trust's distributor, Barr Rosenberg Funds Distributor,
Inc. (the "Distributor").  The Distributor is an affiliate of BISYS.  Under the
Distributor's Contract between the Trust and the Distributor (the "Distributor's
Contract"), the Distributor is not obligated to sell any specific amount of
shares of the Trust and will purchase shares for resale only against orders for
shares.

    Pursuant to the Distribution Plan (the "Plan") described in the Prospectus,
in connection with the distribution of Select Shares of the Trust, the
Distributor receives certain distribution fees from the Trust. Subject to the
percentage limitation on the distribution fee set forth in the Prospectus, the
distribution fee may be paid in respect of services rendered and expenses borne
in the past with respect to each such class as to which no distribution fee was
paid on account of such limitation.  The Distributor may pay all or a portion of
the distribution fees it receives from the Trust to participating and
introducing brokers. The Distributor did not charge any distribution fees to 
the Trust through the fiscal year ended March 31, 1997.

    The Plan may be terminated with respect to the class of shares of any Fund
to which the Plan relates by vote of a majority of the Trustees of the Trust who
are not interested persons of the Trust (as defined in the 1940 Act) and who
have no direct or indirect financial interest in the operation of the Plan or
the Distributor's Contract (the "Independent Trustees"), or by vote of a
majority of the outstanding voting securities of that class.  Any change in the
Plan that would materially increase the cost to the class of shares of any Fund
to which the Plan relates requires approval by the affected class of
shareholders of that Fund.  The Trustees of the Trust review quarterly a written
report of such costs and the purposes for which such costs have been incurred.
Except as described above, the Plan may be amended by vote of the Trustees of
the Trust, including a majority of the Independent Trustees, cast in person at a
meeting called for the purpose.  For so long as the Plan is in effect, selection
and nomination of those trustees of the Trust who are not interested persons of
the Trust shall be committed to the discretion of such disinterested persons.

    The Distributor's Contract may be terminated with respect to any Fund or
class of shares thereof at any time by not more than 60 days' nor less than 30
days' written notice without payment of any penalty either by the Distributor or
by such Fund or class and will terminate automatically, without the payment of
any penalty, in the event of its assignment.

    The Distributor's Contract and the Plan will continue in effect with
respect to each class of shares to which they relate for successive one-year
periods, provided that each such continuance is specifically approved (i) by the
vote of a majority of the Independent Trustees and (ii) by the vote of a
majority of the entire Board of Trustees (or by vote of a majority of the
outstanding shares of a class, in the case of the Distributor's Contract) cast
in person at a meeting called for that purpose.

    If the Distributor's Contract or the Plan are terminated (or not renewed)
with respect to one or more classes, they may continue in effect with respect to
any class of any Fund as to which they have not been terminated (or have been
renewed).

    The Trustees of the Trust believe that the Plan will provide benefits to
the Trust.  The Trustees of the Trust believe that the Plan will result in
greater sales and/or fewer redemptions of Select Shares, although it is

                                       14

<PAGE>

impossible to know for certain the level of sales and redemptions of Select
Shares that would occur in the absence of the Plan or under alternative
distribution schemes.  The Trustees of the Trust believe that the effect on
sales and/or redemptions benefit the Trust by reducing Fund expense ratios
and/or by affording greater flexibility to Fund managers.

CUSTODIAL ARRANGEMENTS.  State Street Bank and Trust Company ("State Street 
Bank"), Boston, Massachusetts 02102, is the Trust's custodian.  As such, 
State Street Bank holds in safekeeping certificated securities and cash 
belonging to the Trust and, in such capacity, is the registered owner of 
securities in book-entry form belonging to a Fund. Upon instruction, State 
Street Bank receives and delivers cash and securities of a Fund in connection 
with Fund transactions and collects all dividends and other distributions 
made with respect to Fund portfolio securities. State Street Bank has also 
contracted with certain foreign banks and depositories to hold portfolio 
securities outside of the United States on behalf of the Trust.

INDEPENDENT ACCOUNTANTS.  The Trust's independent accountants are Price
Waterhouse LLP, 160 Federal Street, Boston, Massachusetts 02110.  Price
Waterhouse LLP conducts an annual audit of the Trust's financial statements,
assists in the preparation of the Trust's federal and state income tax returns
and the Trust's filings with the Securities and Exchange Commission, and
consults with the Trust as to matters of accounting and federal and state income
taxation.

                               PORTFOLIO TRANSACTIONS

INVESTMENT DECISIONS.  The purchase and sale of portfolio securities for the
Funds and for the other investment advisory clients of the Manager are made by
the Manager with a view to achieving each client's investment objective.  For
example, a particular security may be purchased or sold on behalf of certain
clients of the Manager even though it could also have been purchased or sold for
other clients at the same time.  Likewise, a particular security may be
purchased on behalf of one or more clients when the Manager is selling the same
security on behalf of one or more other clients.  In some instances, therefore,
the Manager, acting for one client may sell indirectly a particular security to
another client.  It also happens that two or more clients may simultaneously buy
or sell the same security, in which event purchases or sales are effected pro
rata on the basis of cash available or other equitable basis so as to avoid any
one account's being preferred over any other account.

BROKERAGE AND RESEARCH SERVICES.  Transactions on stock exchanges and other
agency transactions involve the payment of negotiated brokerage commissions.
Such commissions vary among different brokers.  There is generally no stated
commission in the case of securities traded in the over-the-counter markets, but
the price paid for such securities usually includes an undisclosed dealer
commission or mark up.  In placing orders for the portfolio transactions of a
Fund, the Manager will seek the best price and execution available, except to
the extent it may be permitted to pay higher brokerage commissions for brokerage
and research services as described below.  The determination of what may
constitute best price and execution by a broker-dealer in effecting a securities
transaction involves a number of considerations, including, without limitation,
the overall net economic result to the Fund (involving price paid or received
and any commissions and other costs paid), the efficiency with which the
transaction is effected, the ability to effect the transaction at all where a
large block is involved, availability of the broker to stand ready to execute
possibly difficult transactions in the future and the financial strength and
stability of the broker.  Because of such factors, a broker-dealer effecting a
transaction may be paid a commission higher than that charged by another
broker-dealer.  Most of the foregoing are judgmental considerations.

                                       15

<PAGE>

Over-the-counter transactions often involve dealers acting for their own
account.  It is the Manager's policy to place over-the-counter market orders for
a Fund with primary market makers unless better prices or executions are
available elsewhere.

Although the Manager does not consider the receipt of research services as a
factor in selecting brokers to effect portfolio transactions for a Fund, the
Manager will receive such services from brokers who are expected to handle a
substantial amount of such Fund's portfolio transactions.  Research services may
include a wide variety of analyses, reviews and reports on such matters as
economic and political developments, industries, companies, securities and
portfolio strategy.  The Manager uses such research in servicing other clients
as well as the Trust.

As permitted by Section 28(e) of the Securities Exchange Act of 1934, as
amended, and subject to such policies as the Trustees of the Trust may
determine, the Manager may pay an unaffiliated broker or dealer that provides
"brokerage and research services" (as defined in the Act) to the Manager an
amount of commission for effecting a portfolio investment transaction in excess
of the amount of commission another broker or dealer would have charged for
effecting that transaction.

The U.S. Small Capitalization Series paid brokerage commissions in the amounts
of $137,979 for the fiscal year ended March 31, 1995, $220,065.63 for the fiscal
year ended March 31, 1996 and $235,162 for the fiscal year ended March 31,
1997.

The Japan Series paid brokerage commissions in the amounts of $10,763 for the
fiscal year ended March 31, 1995, $6,509.21 for the fiscal year ended March 31,
1996 and $2,266 for the fiscal year ended March 31, 1997.

The Japan Series may pay brokerage commissions to Nomura Securities Company, 
Inc. ("Nomura Securities"), which may be deemed to be an "affiliate of an 
affiliate" of the Trust, for acting as the Fund's agent on purchases and 
sales of securities for the portfolio of the Fund.  Securities and Exchange 
Commission rules require that commissions paid to an affiliate of an 
affiliate by the Fund for portfolio transactions not exceed "usual and 
customary" brokerage commissions.  The rules define "usual and customary" 
commissions to include amounts which are "reasonable and fair compared to the 
commission, fee or other remuneration received or to be received by other 
brokers in connection with comparable transactions involving similar 
securities being purchased or sold on a securities exchange during a 
comparable period of time."  The Trustees, including those who are not 
"interested persons" of the Trust, have adopted procedures for evaluating the 
reasonableness of commissions paid to Nomura Securities and will review these 
procedures periodically.  In the fiscal year ended March 31, 1995, the Fund 
paid an aggregate of $2,967 in brokerage commissions to Nomura Securities.  
The Fund did not pay any brokerage commissions to Nomura Securities during 
its fiscal years ended March 31, 1996 and March 31, 1997.

The International Small Capitalization Series paid brokerage commissions in 
the amount of $32,340 for the period from September 23, 1996 (inception date) 
to March 31, 1997.

                                       16

<PAGE>

                            TOTAL RETURN CALCULATIONS

Each Fund computes its average annual total return separately for its share 
classes by determining the average annual compounded rates of return during 
specified periods that would equate the initial amount invested in a 
particular share class to the ending redeemable value of such investment in 
the class, according to the following formula:

                                        n
                                P(1 + T)  =  ERV

      Where: T     =     Average annual total return
             ERV   =     Ending redeemable value of a hypothetical $1,000 
                         payment made at the beginning of a period at the
                         end of such period
             P     =     A hypothetical initial payment of $1,000 
             n     =     Number of years
   
Each Fund computes it cumulative total return separately for its share 
classes by determining the cumulative rates of return during specified 
periods that would equate the initial amount invested in a particular share 
class to the ending redeemable value of such investment in the class, 
according to the following formula:
    

   
                             T = ERV - 1,000
                             ---------------
                                  1,000
     Where: T      =     Cumulative rate of return
            ERV    =     Ending redeemable value of a hypothetical $1,000
                         payment made at the beginning of a period at the 
                         end of such period
    

   
The calculations of average annual total return and cumulative total return 
assume that any dividends and distributions are reinvested immediately, 
rather than paid to the investor in cash. The ending redeemable value 
(variable "ERV" in each formula) is determined by assuming complete 
redemption of the hypothetical investment and the deduction of all 
nonrecurring charges at the end of the period covered by the computations.
    

   
Unlike bank deposits or other investments that pay a fixed yield or return 
for a stated period of time, the return for a Fund will fluctuate from time 
to time and does not provide a basis for determining future returns.  Average 
annual total return and cumulative total return are based on many factors, 
including market conditions, the composition of a Fund's portfolio and a 
Fund's operating expenses.
    

   
Select Shares, Adviser Shares and Institutional Shares are subject to 
different fees and expenses and may have different performance for the same 
period.
    

The average annual total returns for each of the Funds as of March 31, 1997 
were as follows:

U.S. Small Capitalization Series
- --------------------------------
<TABLE>
<CAPTION>
                                   Inception Date to    4/1/92 to    4/1/94 to       4/1/96 to
                 Inception Date         3/31/97          3/31/97      3/31/97          3/31/97
                 --------------    -----------------    ---------    ----------      ---------
<S>             <C>                <C>                 <C>          <C>             <C>
Select Shares       10/22/96             6.84%*            N/A          N/A             N/A

Adviser Shares      1/21/97             -3.25%*            N/A          N/A             N/A

Institutional
   Shares           2/22/89             15.79%            20.26%       22.10%          19.53%
</TABLE>

* Represents cumulative total return since inception.

                                          17

<PAGE>

JAPAN SERIES
- ------------
<TABLE>
<CAPTION>
                                   Inception Date to    4/1/92 to    4/1/94 to      4/1/96 to
                 Inception Date         3/31/97          3/31/97       3/31/97       3/31/97
                 --------------    -----------------    ---------    ---------      ---------
<S>             <C>               <C>                  <C>          <C>            <C>
Select Shares       10/22/96           -22.59%*            N/A           N/A           N/A

Institutional
   Shares           1/3/89              -4.23%             1.06%        -8.48%       -28.68%
</TABLE>

* Represents cumulative total return since inception.

INTERNATIONAL SMALL CAPITALIZATION SERIES
- -----------------------------------------

                                   Inception Date to
                 Inception Date         3/31/97     
                 --------------    -----------------

Select Shares       9/23/96               .90%*    

Institutional
   Shares           10/29/96             1.30%*     

* Represents cumulative total return since inception.

Performance Comparisons
- -----------------------

Investors may judge the performance of the Funds by comparing them to the 
performance of other mutual fund portfolios with comparable investment 
objectives and policies through various mutual fund or market indices such 
as those prepared by Dow Jones & Co., Inc. and Standard & Poor's Corporation 
and to data prepared by Lipper Analytical Services, Inc., a widely recognized 
independent service which monitors the performance of mutual funds. 
Comparisons may also be made to indices or data published in MONEY MAGAZINE, 
FORBES, BARRON'S, THE WALL STREET JOURNAL, MORNINGSTAR, INC., IBBOTSON 
ASSOCIATES, CDA/WIESENBERGER, THE NEW YORK TIMES, BUSINESS WEEK, U.S.A.TODAY, 
INSTITUTIONAL INVESTOR and local periodicals. In addition to performance 
information, general information about the Funds that appears in a 
publication such as those mentioned above may be included in advertisements, 
sales literature and reports to shareholders. The Funds may also include in 
advertisements and reports to shareholders information discussing the 
performance of the Manager in comparison to other investment advisers and to 
other institutions.

From time to time, the Trust may include the following types of information 
in advertisements, supplemental sales literature and reports to shareholders: 
(1) discussions of general economic or financial principles (such as the 
effects of inflation, the power of compounding and the benefits of dollar 
cost averaging); (2) discussions of general economic trends; (3) 
presentations of statistical data to supplement such discussions; (4) 
descriptions of past or anticipated portfolio holdings for the Funds; (5) 
descriptions of investment strategies for the Funds; (6) descriptions or 
comparisons of various investment products, which may or may not include the 
Funds; (7) comparisons of investment products (including the Funds) with 
relevant market or industry indices or other appropriate benchmarks; (8) 
discussions of fund rankings or ratings by recognized rating organizations; 
and (9) testimonials describing the experience of persons that have invested 
in a Fund. The Trust may also include calculations, such as hypothetical 
compounding examples, which describe hypothetical investment results in such 
communications. Such performance examples will be based on an express set of 
assumptions and are not indicative of the performance of a Fund.

                                            18
<PAGE>

                  DESCRIPTION OF THE TRUST AND OWNERSHIP OF SHARES

As more fully described in the Prospectus, the Trust is a diversified open-end
series investment company organized as a Massachusetts business trust.  A copy
of the Agreement and Declaration of Trust of the Trust, as amended (the
"Declaration of Trust") is on file with the Secretary of The Commonwealth of
Massachusetts.  The fiscal year of the Trust ends on March 31.  The Trust
changed its name to "Barr Rosenberg Series Trust" from "Rosenberg Series Trust"
on August 5, 1996.

Interests in the Trust's portfolios are currently represented by shares of three
series, the U.S. Small Capitalization Series, the International Small
Capitalization Series and the Japan Series, issued pursuant to the Declaration
of Trust.  The rights of shareholders and powers of the Trustees of the Trust
with respect to such shares are described in the Prospectus.

As described in the Prospectus, each Fund is further divided into three classes
of shares designated as Institutional Shares, Adviser Shares and Select Shares.
Each class of shares of each Fund represents interests in the assets of the Fund
and has identical dividend, liquidation and other rights and the same terms and
conditions except that expenses, if any, related to the distribution and
shareholder servicing of a particular class are borne solely by such class and
each class may, at the discretion of the Trustees of the Trust, also pay a
different share of other expenses, not including advisory or custodial fees or
other expenses related to the management of the Trust's assets, if these
expenses are actually incurred in a different amount by that class, or if the
class receives services of a different kind or to a different degree than the
other classes.  All other expenses are allocated to each class on the basis of
the net asset value of that class in relation to the net asset value of the
particular Fund.

The Declaration of Trust provides for the perpetual existence of the Trust.  The
Trust may, however, be terminated at any time by vote of at least two-thirds of
the outstanding shares of the Trust.

VOTING RIGHTS

Shareholders are entitled to one vote for each full share held (with fractional
votes for fractional shares held) and will vote (to the extent provided herein)
in the election of Trustees and the termination of the Trust and on other
matters submitted to the vote of shareholders.  Shareholders will vote by
individual Fund on all matters except (i) when required by the 1940 Act, shares
shall be voted in the aggregate and not by individual Fund, and (ii) when the
Trustees have determined that the matter affects only the interests of one or
more Funds, then only shareholders of such Funds shall be entitled to vote
thereon.  Shareholders of one Fund shall not be entitled to vote on matters
exclusively affecting another Fund, such matters including, without limitation,
the adoption of or change in any fundamental policies or restrictions of the
other Fund and the approval of the investment advisory contracts of the other
Fund.

Each class of shares of each Fund has identical voting rights except that each
class has exclusive voting rights on any matter submitted to shareholders that
relates solely to that class, and has separate voting rights on any matter
submitted to shareholders in which the interests of one class differ from the
interests of any other class.  Each class of shares has exclusive voting rights
with respect to matters pertaining to any distribution or servicing plan
applicable to that class.  All three classes of shares of a Fund will vote
together, except with respect to any distribution or servicing plan applicable
to a class or when a class vote is required as specified above or otherwise by
the 1940 Act.

There will normally be no meetings of shareholders for the purpose of electing
Trustees, except that in accordance with the 1940 Act (i) the Trust will hold a
shareholders' meeting for the election of Trustees at such time as less than a
majority of the Trustees holding office have been elected by shareholders, and

                                       19

<PAGE>

(ii) if, as a result of a vacancy in the Board of Trustees, less than two-thirds
of the Trustees holding office have been elected by the shareholders, that
vacancy may only be filled by a vote of the shareholders.  In addition, Trustees
may be removed from office by a written consent signed by the holders of
two-thirds of the outstanding shares and filed with the Trust's custodian or by
a vote of the holders of two-thirds of the outstanding shares at a meeting duly
called for the purpose, which meeting shall be held upon the written request of
the holders of not less than 10% of the outstanding shares.  Upon written
request by the holders of at least 1% of the outstanding shares stating that
such shareholders wish to communicate with the other shareholders for the
purpose of obtaining the signatures necessary to demand a meeting to consider
removal of a Trustee, the Trust has undertaken to provide a list of shareholders
or to disseminate appropriate materials (at the expense of the requesting
shareholders).  Except as set forth above, the Trustees shall continue to hold
office and may appoint successor Trustees.  Voting rights are not cumulative.

No amendment may be made to the Declaration of Trust without the affirmative
vote of a majority of the outstanding shares of the Trust except (i) to change
the Trust's name or to cure technical problems in the Declaration of Trust and
(ii) to establish, designate or modify new and existing series, sub-series or
classes of shares of any series of Trust shares or other provisions relating to
Trust shares in response to applicable laws or regulations.

SHAREHOLDER AND TRUSTEE 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 all
the property of the relevant Fund for all loss and expense of any shareholder of
that Fund held personally liable for the obligations of the Trust.  Thus, the
risk of a shareholder incurring financial loss on account of shareholder
liability is considered remote since it is limited to circumstances in which the
disclaimer is inoperative and the Fund of which he is or was a shareholder would
be unable to meet its obligations.

The Declaration of Trust further provides that the Trustees will not be liable
for errors of judgment or mistakes of fact or law.  However, nothing in the
Declaration of Trust protects a Trustee against any liability to which the
Trustee would otherwise be subject by reason of willful misfeasance, bad faith,
gross negligence, or reckless disregard of the duties involved in the conduct of
his office.  The Declaration of Trust also provides for indemnification by the
Trust of the Trustees and the officers of the Trust against liabilities and
expenses reasonably incurred in connection with litigation in which they may be
involved because of their offices with the Trust, except if it is determined in
the manner specified in the Declaration of Trust that such Trustees are liable
to the Trust or its shareholders by reason of willful misfeasance, bad faith,
gross negligence or reckless disregard of his or her duties.  In addition, the
Manager has agreed to indemnify each Trustee who is not "an interested person"
of the Trust to the maximum extent permitted by the 1940 Act against any
liabilities arising by reason of such Trustee's status as a Trustee of the
Trust.

                                       20

<PAGE>

OWNERS OF 5% OR MORE OF A FUND'S SHARES

The following chart sets forth the names, addresses and percentage ownership of
those shareholders owning beneficially and of record 5% or more of the
outstanding shares of the U.S. Small Capitalization Series as of July 2, 1997:

Name and Address                        Percentage Ownership
   of Owner                                 of the Fund
- --------------------                        -----------

The Nathan Cummings Foundation                 6.84%
50 S. LaSalle St.
Chicago, IL 60675-0001

The Evangelical Lutherans                     17.28%
1 Cabot Rd.                                           
Medford, MA 02155-5158

University of Washington
Northern Trust Co.                             8.27%
801 S. Canal CB3S
Chicago, IL 60607

Charles Schwab & Co. Inc.                     22.69%
101 Montgomery St.
San Francisco, CA 94104

Miter & Co.                                   14.13%
c/o Marshall & Ilsley Trust Company
P.O. Box 2977
Milwaukee, WI 53202

                                       21

<PAGE>

The following chart sets forth the names, addresses and percentage ownership of
those shareholders owning beneficially and of record 5% or more of the
outstanding shares of the Japan Series as of July 2, 1997:

Name and Address                               Percentage Ownership
   of Owner                                         of the Fund
   --------                                         -----------

Rosenberg Institutional                                92.03%
Equity Management
4 Orinda Way, Suite 300E
Orinda, CA  94563

Koko M Baker                                            5.51%
c/o RIEM
4 Orinda Way
Orinda, CA  94563

As of July 2, 1997, Rosenberg Institutional Equity Management, a 
California limited partnership, may be deemed to control the Japan Series 
because it owned of record more than 25% of the Japan Series' shares. As a 
result, it may not be possible for matters subject to a vote of a majority of 
the outstanding voting securities of the Fund to be approved without the 
affirmative vote of such shareholder, and it may be possible for such matters 
to be approved by such shareholder without the affirmative vote of any other 
shareholder. 

The following chart sets forth the names, addresses and percentage 
ownership of those shareholders owning beneficially(1) and of record 5% or 
more of the outstanding shares of the International Small Capitalization 
Series as of July 2, 1997: 

Name and Address                               Percentage Ownership
   of Owner                                         of the Fund
   --------                                         -----------

Rosenberg Money Purchase Pension Plan                  13.09%
101 Carnegie Ctr
Princeton, NJ 08540-6231

Stetson University Inc.                                10.95%
421 N. Woodland Blvd.
Deland Fl 32720

Charles Schwab & Co. Inc.                              60.81%
101 Montgomery St.
San Francisco, CA 94104-1299

Harco Investors                                         5.46%
P.O. Box 15299
Sacramento, CA 95851-1299

Batrus and Company                                      5.18%
c/o Bankers Trust Company
P.O. Box 4005
Church Street Station
New York, NY 10003

(1) Charles Schwab & Co. Inc. disclaims beneficial ownership.

As of July 2, 1997, Charles Schwab & Co. Inc., a wholly-owned subsidiary 
of Charles Schwab Corporation, a Delaware corporation, may be deemed to 
control the International Small Capitalization Series because it owned of 
record more than 25% of the International Small Capitalization Series' 
shares. As a result, it may not be possible for matters subject to a vote of 
a majority of the outstanding voting securities of the Fund to be approved 
without the affirmative vote of such shareholder, and it may be possible for 
such matters to be approved by such shareholder without the affirmative vote 
of any other shareholder. 

The officers and trustees of the Trust, as a group, own less than 1% of 
any class of outstanding shares of the Trust except of the Japan Series. 

                          DETERMINATION OF NET ASSET VALUE

   
As indicated in the Prospectus, the net asset value of each Fund share is 
determined on each day on which the New York Stock Exchange is open for 
trading.  The Trust expects that the days, other than weekend days, that the 
New York Stock Exchange will not be open are Independence Day, Labor Day, 
Thanksgiving Day, Christmas Day, New Year's Day, Martin Luther King, Jr. Day,
President's Day, Good Friday and Memorial Day.
    

Portfolio securities listed on a securities exchange for which market quotations
are available are valued at the last quoted sale price on each business day, or,
if there is no such reported sale, at the most recent quoted bid price.  Price
information on listed securities is generally taken from the closing price on
the exchange where the security is primarily traded.  Unlisted securities for
which market quotations are readily available are valued at the most recent
quoted bid price, except that debt obligations with sixty days or less remaining
until maturity may be valued at their amortized cost.  Exchange-traded options,
futures and options on futures are valued at the settlement price as determined
by the appropriate clearing corporation.  Other assets and securities for which
no quotations are readily available are valued at fair value as determined in
good faith by the Trustees of the Trust or by persons acting at their direction.

The procedures for purchasing shares of each of the Funds and for determining
the offering price of such shares are described in the Prospectus.  The Trust
has elected to be governed by Rule 18f-1 under the 1940 Act pursuant to which
the Trust is obligated to redeem shares solely in cash for any shareholder
during any 90-day period up to the lesser of (i) $250,000 or (ii) 1% of the
total net asset value of the Trust at the beginning of such period.  The
procedures for redeeming shares of each of the Funds are described in the
Prospectus.

                             FINANCIAL STATEMENTS

The Report of Independent Accountants, financial highlights and financial 
statements of the Funds included in their Annual Report for the period ended 
March 31, 1997 (the "Annual Report") are incorporated herein by reference to 
such Annual Report. Copies of such Annual Report are available without charge 
upon request by writing to Barr Rosenberg Series Trust, 3435 Stelzer Road, 
Columbus, Ohio 43219 or telephoning 1-800-447-3332.

The financial statements incorporated by reference into this Statement of 
Additional Information have been audited by Price Waterhouse LLP, independent 
accountants, and have been so included and incorporated by reference in 
reliance upon the report of said firm, which report is given upon their 
authority as experts in auditing and accounting.

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