HIGHMARK GROUP /OH/
497, 1997-02-04
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<PAGE>   1
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR
     MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT
     BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR
     THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE
     UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS
     OF ANY SUCH STATE.
 
                             SUBJECT TO COMPLETION
 
                                 HIGHMARK FUNDS
 
                               FIXED INCOME FUNDS
 
  HighMark Funds ("HighMark") is an open-end, diversified, registered investment
company that offers a convenient means of investing in one or more
professionally managed portfolios of securities. This Prospectus relates to
HighMark's:
 
                             - Intermediate-Term Bond Fund
                             - Bond Fund
                             - Government Securities Fund
 
                                FIDUCIARY SHARES
 
  HighMark's Fiduciary Shares are offered to the following investors: (i)
fiduciary, advisory, agency, custodial and other similar accounts maintained
with Union Bank of California, N.A. or its affiliates; (ii) Select IRA accounts
established with The Bank of California, N.A. and invested in any of HighMark's
Equity or Fixed Income Funds prior to June 20, 1994, which have remained
continuously open thereafter and which are not considered to be fiduciary
accounts; (iii) Shareholders who currently own Shares of HighMark's Equity or
Fixed Income Funds that were purchased prior to June 20, 1994 within an account
registered in their name with the Funds; and (iv) present and retired directors,
officers and employees (and their spouses and children under the age of 21) of
Union Bank of California, N.A., HighMark's current or former distributors or
their respective affiliated companies who currently own Shares of HighMark Funds
which were purchased before April 30, 1997.
 
  This Prospectus sets forth concisely the information about HighMark and the
Funds that a prospective investor should know before investing. Investors are
advised to read this Prospectus and retain it for future reference. A Statement
of Additional Information dated the same date as this Prospectus has been filed
with the Securities and Exchange Commission and is available without charge by
writing the Distributor, SEI Financial Services Company, Oaks, Pennsylvania
19456, or by calling 1-800-433-6884. The Statement of Additional Information is
incorporated into this Prospectus by reference. This Prospectus relates only to
the Fiduciary Shares of the Fixed Income Funds. Interested persons who wish to
obtain a prospectus for the other Funds of HighMark may contact the Distributor
at the above address and telephone number.
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
HIGHMARK'S SHARES ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK, INCLUDING UNION BANK OF CALIFORNIA, N.A., BANK OF
TOKYO-MITSUBISHI, LIMITED OR ANY OF THEIR AFFILIATES OR CORRESPONDENTS.
HIGHMARK'S SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE
CORPORATION OR ANY OTHER GOVERNMENT AGENCY. INVESTMENT IN HIGHMARK INVOLVES
RISKS, INCLUDING POSSIBLE LOSS OF THE PRINCIPAL AMOUNT INVESTED.
 
February 26, 1997
Fiduciary Shares
<PAGE>   2
 
                                    SUMMARY
 
HIGHMARK FUNDS ("HighMark") is an open-end, diversified, registered investment
company providing a convenient way to invest in professionally managed
portfolios of securities. The following provides basic information about the
Fiduciary Shares of the Intermediate-Term Bond, Bond, and Government Securities
Funds (each a "Fund" and sometimes referred to in this prospectus as the "Fixed
Income Funds.") This summary is qualified in its entirety by reference to the
more detailed information provided elsewhere in the Prospectus and in the
Statement of Additional Information.
 
WHAT ARE THE FUNDS' INVESTMENT OBJECTIVES? THE INTERMEDIATE-TERM BOND FUND seeks
total return through investments in fixed-income securities. THE BOND FUND seeks
current income through investments in long-term, fixed-income securities. THE
GOVERNMENT SECURITIES FUND seeks to achieve total return consistent with the
preservation of capital by investing in a diversified portfolio of obligations
issued or guaranteed by the U.S. government or its agencies or
instrumentalities. (See "INVESTMENT OBJECTIVES")
 
WHAT ARE THE FUNDS' PERMITTED INVESTMENTS? THE INTERMEDIATE-TERM BOND FUND
primarily invests in bonds. THE BOND FUND invests in long-term bonds. Bonds
include debt obligations such as bonds, notes, debentures and securities
convertible into or exercisable for debt obligations that are issued by U.S.
corporations or issued or guaranteed by the U.S. Government, its agencies, or
instrumentalities; investments may also include zero-coupon obligations,
mortgage-related securities and asset-backed securities. THE GOVERNMENT
SECURITIES FUND invests primarily in debt obligations issued or guaranteed by
the U.S. government or its agencies or instrumentalities, including
mortgage-backed securities issued or guaranteed by U.S. government agencies.
(See "INVESTMENT POLICIES")
 
WHAT ARE THE RISKS INVOLVED WITH AN INVESTMENT IN THE FUNDS? The investment
policies of each Fund entail certain risks and considerations of which an
investor should be aware. The market value of a Fund's fixed income investments
will change in response to interest rate changes and other factors. During
periods of falling interest rates, the value of outstanding fixed income
securities generally rises. Conversely, during periods of rising interest rates,
the value of such securities generally declines. (See "Risk Factors")
 
ARE MY INVESTMENTS INSURED? HighMark's Shares are not federally insured by the
FDIC or any other government agency. Any guarantee by the U.S. Government, its
agencies or any instrumentalities of the securities in which any Fund invests
guarantees only the payment of principal and interest on the guaranteed
security, and does not guarantee the total return or value of the security or
total return or value of Shares of that Fund.
 
WHO IS THE ADVISOR? Pacific Alliance Capital Management, a division of Union
Bank of California, N.A., serves as the Advisor to HighMark. (See "The Advisor")
 
WHO IS THE SUB-ADVISOR? Bank of Tokyo-Mitsubishi Trust Company serves as the
Sub-Adviser to the Government Securities Fund. (See "The Sub-Advisor")
 
WHO IS THE ADMINISTRATOR? SEI Fund Resources serves as the Administrator of
HighMark. (See "The Administrator")
 
                                        2
<PAGE>   3
 
WHO IS THE CUSTODIAN? Union Bank of California, N.A., (the "Bank") serves as the
Custodian of HighMark's assets. (See "The Custodian")
 
WHO IS THE DISTRIBUTOR? SEI Financial Services Company acts as distributor of
HighMark's Shares. (See "The Distributor")
 
HOW DO I PURCHASE AND REDEEM SHARES? Purchases and redemptions may be made
through the Distributor on days on which both the New York Stock Exchange and
the Federal Reserve wire system are open for business ("Business Days"). The
minimum initial investment is generally $1,000. A purchase order will be
effective if the Distributor receives an order prior to 1:00 p.m., Pacific time
(4:00 p.m., Eastern time). Purchase orders for Shares will be executed at a per
Share price equal to the asset value next determined after the purchase order is
effective. Redemption orders must be placed prior to 1:00 p.m., Pacific time
(4:00 p.m., Eastern time) on any Business Day for the order to be effective that
day. (See "PURCHASE AND REDEMPTION OF SHARES")
 
HOW ARE DIVIDENDS PAID? Substantially all of the net investment income
(exclusive of capital gains) of the Funds is distributed in the form of monthly
dividends to Shareholders of record. Any capital gain is distributed at least
annually. Distributions are paid in additional Shares unless the Shareholder
elects to take the payment in cash. (See "DIVIDENDS")
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
Summary...............................................................................    2
Fixed Income Funds Fee Table..........................................................    5
Financial Highlights..................................................................    7
Fund Description......................................................................   10
Investment Objective..................................................................   10
Investment Policies...................................................................   10
  Intermediate-Term Bond Fund.........................................................   10
  Bond Fund...........................................................................   11
  Government Securities Fund..........................................................   11
General...............................................................................   12
  Money Market Instruments............................................................   12
  Illiquid and Restricted Securities..................................................   12
  Lending of Portfolio Securities.....................................................   13
  Other Investments...................................................................   13
  Risk Factors........................................................................   14
Investment Limitations................................................................   15
  Portfolio Turnover..................................................................   16
Purchase and Redemption of Shares.....................................................   16
Exchange Privileges...................................................................   17
</TABLE>
 
                                        3
<PAGE>   4
 
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
Dividends.............................................................................   18
Federal Taxation......................................................................   19
Service Arrangements..................................................................   20
  The Advisor.........................................................................   20
  The Sub-Advisor.....................................................................   21
  Administrator.......................................................................   22
  The Transfer Agent..................................................................   23
  Shareholder Service Plan............................................................   23
  Distributor.........................................................................   23
  Banking Laws........................................................................   23
  Custodian...........................................................................   24
General Information...................................................................   24
  Description of HighMark & Its Shares................................................   24
  Performance Information.............................................................   25
  Miscellaneous.......................................................................   26
Description of Permitted Investments..................................................   26
</TABLE>
 
                                        4
<PAGE>   5
 
                          FIXED INCOME FUNDS FEE TABLE
 
<TABLE>
<CAPTION>
                                                                            INTERMEDIATE- TERM                GOVERNMENT
                                                                                BOND FUND       BOND FUND   SECURITIES FUND
                                                                                FIDUCIARY       FIDUCIARY      FIDUCIARY
                                                                                 SHARES          SHARES         SHARES
                                                                            -----------------   ---------   ---------------
<S>                                                                         <C>                 <C>         <C>
SHAREHOLDER TRANSACTION EXPENSES(A)
  Maximum Sales Load Imposed on Purchases (as a percentage of offering
    price)................................................................         0.00%           0.00%          0.00%
  Maximum Sales Load Imposed on Reinvested Dividends (as a percentage of
    offering price).......................................................            0%              0%             0%
  Deferred Sales Load (as a percentage of original purchase price or
    redemption proceeds, as applicable)...................................            0%              0%             0%
  Redemption Fees (as a percentage of amount redeemed, if
    applicable)(b)........................................................            0%              0%             0%
  Exchange Fee(a).........................................................        $   0           $   0          $   0
ANNUAL OPERATING EXPENSES (as a percentage of net assets)
  Management Fees.........................................................         0.50%           0.50%          0.50%
  12b-1 Fees..............................................................         0.00%           0.00%          0.00%
  Other Expenses (after voluntary reduction)(c)...........................         0.25%           0.25%          0.25%
                                                                                   ----            ----           ----
  Total Fund Operating Expenses (after voluntary reduction)(d)............         0.75%           0.75%          0.75%
                                                                                   ====            ====           ====
</TABLE>
 
  EXAMPLE: You would pay the following expenses on a $1,000 investment, assuming
(1) 5% annual return and (2) redemption at the end of each time period.
 
<TABLE>
<CAPTION>
                                                                 1 YEAR   3 YEARS   5 YEARS   10 YEARS
                                                                 ------   -------   -------   --------
<S>                                                              <C>      <C>       <C>       <C>
Intermediate-Term Bond Fund Fiduciary Shares...................    $8       $24       $42       $ 93
Bond Fund Fiduciary Shares.....................................    $8       $24       $42       $ 93
Government Securities Fund Fiduciary Shares....................    $8       $24       $42       $ 93
</TABLE>
 
  The purpose of the tables above is to assist an investor in the Fixed Income
Funds in understanding the various costs and expenses that a Shareholder will
bear directly or indirectly. For a more complete discussion of each Fund's
annual operating expenses, see SERVICE ARRANGEMENTS below. THE FOREGOING EXAMPLE
SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE EXPENSES. ACTUAL
EXPENSES MAY BE GREATER OR LESS THAN THOSE SHOWN.
- ---------------
 
(a) Certain entities (including Union Bank of California and its affiliates)
    making investments in the Fixed Income Funds on behalf of their customers
    may charge customers fees for services provided in connection with the
    investment in, redemption of, and exchange of Shares. (See PURCHASE AND
    REDEMPTION OF SHARES, EXCHANGE PRIVILEGES, and SERVICE ARRANGEMENTS below.)
 
(b) A wire redemption charge is deducted from the amount of a wire redemption
    payment made at the request of a Shareholder.
 
(c) OTHER EXPENSES for the Intermediate-Term Bond and Government Securities
    Funds are based on each Fund's estimated expenses for the current fiscal
    year. Absent voluntary fee waivers, OTHER EXPENSES would be 0.49% for the
    Fiduciary Shares of the Intermediate-Term Bond Fund, 0.51% for the Fiduciary
    Shares of the Bond Fund, and 0.52% for the Fiduciary Shares of the
    Government Securities Fund.
 
                                        5
<PAGE>   6
 
(d) Absent voluntary fee waivers, TOTAL FUND OPERATING EXPENSES would be: 0.99%
    for the Fiduciary Shares of the Intermediate-Term Bond Fund, 1.01% for the
    Fiduciary Shares of the Bond Fund, and 1.02% for the Fiduciary Shares of the
    Government Securities Fund.
 
                                        6
<PAGE>   7
 
                              FINANCIAL HIGHLIGHTS
 
  The table below sets forth certain financial information with respect to the
Fiduciary Shares of the Bond Fund. Information prior to fiscal 1994 is for
Fiduciary Shares only. Financial highlights for the Bond Fund for the period
ended July 31, 1996 have been derived from financial statements audited by
Deloitte & Touche LLP, independent auditors for HighMark, whose report thereon
is included in the Statement of Additional Information. Prior to the fiscal year
ended July 31, 1996, Coopers & Lybrand L.L.P. served as independent auditors for
HighMark. Financial highlights for the Bond Fund for the years ended December
31, 1987, 1986 and 1985 have been derived from financial statements examined by
other auditors whose report thereon is on file with the Securities and Exchange
Commission. Financial highlights for the Bond Fund for the period from January
1, 1988 through June 22, 1988 are derived from unaudited financial statements
prepared by HighMark. The Intermediate-Term Bond Fund and the Government
Securities Fund had not commenced operations in HighMark as of July 31, 1996.
 
  The Bond Fund offered a single class of shares (now designated Fiduciary
Shares) throughout the periods shown.
 
                                   BOND FUND
 
<TABLE>
<CAPTION>
                                                                YEAR ENDED JULY 31,
                                              --------------------------------------------------------
                                                1996        1995       1994(A)       1993       1992
                                              ---------   ---------   ----------   --------   --------
                                              FIDUCIARY   FIDUCIARY   FIDUCIARY
                                              ---------   ---------   ----------
<S>                                           <C>         <C>         <C>          <C>        <C>
Net Asset Value, Beginning of Period........  $   10.38   $   10.11    $  11.13    $  11.02   $  10.29
                                               --------    --------    --------    --------   --------
Investment Activities
  Net investment income.....................       0.66        0.64        0.63        0.70       0.67
  Net realized and unrealized gains (losses)
     on investments.........................      (0.16)       0.27       (0.97)       0.35       0.77
                                               --------    --------    --------    --------   --------
     Total from Investment Activities.......       0.50        0.91       (0.34)       1.05       1.44
                                               --------    --------    --------    --------   --------
Distributions
  Net investment income.....................      (0.65)      (0.64)      (0.63)      (0.70)     (0.67)
  Net realized gains........................                              (0.01)      (0.24)     (0.04)
  In excess of net realized gains...........         --          --       (0.04)         --         --
                                               --------    --------    --------    --------   --------
     Total Distributions....................      (0.65)      (0.64)      (0.68)      (0.94)     (0.71)
                                               --------    --------    --------    --------   --------
Net Asset Value, End of Period..............  $   10.23   $   10.38    $  10.11    $  11.13   $  11.02
                                               ========    ========    ========    ========   ========
Total Return................................       4.81%       9.43%      (3.14)%     10.07%     14.43%
Ratios/Supplementary Data:
Net Assets at end of period (000)...........  $  60,374   $  59,758    $ 64,185    $ 33,279   $ 21,651
Ratio of expenses to average net assets.....       0.89%       0.92%       0.86%       0.93%      0.91%
Ratio of net investment income to average
  net assets................................       6.10%       6.35%       6.11%       6.41%      6.23%
Ratio of expenses to average net assets*....       1.61%       1.64%       1.37%       1.55%      1.55%
Ratio of net investment income to average
  net assets*...............................       5.38%       5.62%       5.60%       5.79%      5.59%
Portfolio turnover..........................      20.88%      36.20%      44.33%      58.81%     79.56%
</TABLE>
 
                                        7
<PAGE>   8
 
<TABLE>
<CAPTION>
                                                                                       JUNE 23, 1988
                                                              YEAR ENDED JULY 31,       TO JULY 31
                                                           -------------------------   -------------
                                                            1991      1990     1989       1988(D)
                                                           -------   ------   ------   -------------
<S>                                                        <C>       <C>      <C>      <C>
Net Asset Value, Beginning of Period.....................  $ 10.18   $10.42   $ 9.86      $ 10.00
                                                           -------   -------  -------     -------
Investment Activities
  Net investment income..................................     0.78     0.79     0.82         0.09
  Net realized and unrealized gains (losses) on
     investments.........................................     0.04    (0.25)    0.56        (0.14)
                                                           -------   -------  -------     -------
     Total from Investment Activities....................     0.82     0.54     1.38        (0.05)
                                                           -------   -------  -------     -------
Distributions
  Net investment income..................................    (0.71)   (0.78)   (0.82)       (0.09)
  Net realized gains
  In excess of net realized gains........................       --       --       --           --
                                                           -------   -------  -------     -------
     Total Distributions.................................    (0.71)   (0.78)   (0.82)       (0.09)
                                                           -------   -------  -------     -------
Net Asset Value, End of Period...........................  $ 10.29   $10.18   $10.42      $  9.86
                                                           =======   ======   ======      =======
Total Return.............................................    8.99%    5.52%   14.79%        (0.96)%(c)
Ratios/Supplementary Data:
Net Assets at end of period (000)........................  $10,799   $6,974   $4,655      $ 3,487
Ratio of expenses to average net assets..................     0.79%    1.01%    1.18%        1.04%(b)
Ratio of net investment income to average net assets.....     7.61%    7.77%    8.24%        8.63%(b)
Ratio of expenses to average net assets*.................     1.59%    1.94%    2.11%        2.06%(b)
Ratio of net investment income to average net assets*....     6.81%    6.84%    7.31%        7.61%(b)
Portfolio turnover.......................................    65.81%   53.50%   24.83%        0.00%
</TABLE>
 
- ---------------

(a) On June 20, 1994, the Bond Fund commenced offering Investor Shares (now
    called "Retail Shares") and designated existing shares as Fiduciary Shares.

(b) Annualized.

(c) Not annualized.

(d) The Bond Fund commenced operations on June 23, 1988 as a result of the
    reorganization involving the Bond Portfolio of the IRA Collective Investment
    Fund described under GENERAL INFORMATION-- Reorganization of The IRA Fund &
    HighMark.
 
 *  During the period the investment advisory and administration fees were
    voluntarily reduced. If such voluntary fee reductions had not occurred, the
    ratios would have been as indicated.
 
                                        8
<PAGE>   9
  
                      PER SHARE INCOME AND CAPITAL CHANGES
                (FOR A SHARE OUTSTANDING THROUGHOUT THE PERIODS)
 
               THE IRA COLLECTIVE INVESTMENT FUND BOND PORTFOLIO
 
<TABLE>
<CAPTION>
                                                             JAN. 1,
                                                              1988
                                                             THROUGH
                                                            JUNE 22,       YEAR ENDED     YEAR ENDED
                                                              1988          DEC. 31,       DEC. 31,
                                                           (UNAUDITED)        1987           1986
                                                           -----------     ----------     ----------
<S>                                                        <C>             <C>            <C>
Investment income........................................   $   0.503       $  1.061       $  1.129
Operating expenses.......................................       0.065          0.128(b)       1.119(b)
                                                             --------       --------       --------
Net investment income....................................       0.438          0.933          1.010
Dividends from net investment income.....................      (0.438)        (0.933)        (1.010)
Net realized and unrealized gain (loss) on investments...      (0.050)        (0.966)         0.947
                                                             --------       --------       --------
Increase (decrease) in net asset value...................      (0.050)        (0.966)         0.947
Net Asset Value:
  Beginning of period....................................      11.281         12.247         11.300
                                                             --------       --------       --------
  End of period..........................................   $  11.231       $ 11.281       $ 12.247
                                                             ========       ========       ========
Ratio of expenses to average net assets(a)(b)............        1.20%          1.09%          0.92%
Ratio of net investment income to average net
  assets(a)..............................................        8.03%          7.93%          7.83%
Portfolio turnover.......................................        0.00%          0.00%          1.61%
Number of Shares/units outstanding at end of period......     317,633        344,456        206,664
</TABLE>
 
- ---------------
 
(a)  Annualized based on the period for which assets were held.

(b)  The expenses shown are not representative of expenses actually incurred by
     the Bond Portfolio through May 31, 1987. During mid-May 1985, The Bank of
     California, N.A., investment adviser to the Bond Portfolio, commenced
     charging its management fee, and commencing June 1, 1987, operating
     expenses were charged to the Bond Portfolio. Had the maximum allowable
     operating expenses and management fees been paid by the Bond Portfolio for
     the entire period pursuant to the Management Agreement between the Bond
     Portfolio and The Bank of California, N.A., the per unit expenses and net
     investment income would have been as follows:
 
<TABLE>
<CAPTION>
                                                               JAN. 1,
                                                                1988
                                                               THROUGH
                                                              JUNE 22,     YEAR ENDED     YEAR ENDED
                                                                1988        DEC. 31,       DEC. 31,
                                                             (UNAUDITED)      1987           1986
                                                             -----------   ----------     ----------
<S>                                                          <C>           <C>            <C>
Expenses...................................................    $ 0.240      $  0.226       $  0.231
Net investment income......................................      0.263         0.793          0.779
Net asset value, end of year...............................     11.231        11,281         12.247
Expenses as a percentage of average net asset..............       2.00%(a)      2.00%          2.00%
</TABLE>
 
                                        9
<PAGE>   10
 
FUND
DESCRIPTION             HighMark Funds ("HighMark") is an open-end, diversified,
                      registered investment company that currently offers units
                      of beneficial interest ("Shares") in sixteen separate
                      investment portfolios ("Funds"). All of the Funds are
                      advised by Pacific Alliance Capital Management (the
                      "Advisor"), a division of Union Bank of California, N.A.
                      Shareholders may purchase Shares of selected Funds through
                      two separate classes, (the "Retail" and "Fiduciary"
                      classes). These classes may have different sales charges
                      and other expenses, which may affect performance.
                      Information regarding HighMark's other Funds and other
                      classes is contained in separate prospectuses that may be
                      obtained from HighMark's Distributor, SEI Financial
                      Services Company, at Oaks, Pennsylvania 19456, or by
                      calling 1-800-433-6884.
 
                        For information concerning those investors who qualify
                      to purchase Fiduciary Shares, see PURCHASE AND REDEMPTION
                      OF SHARES below. (Fiduciary Shares may be hereinafter
                      referred to as "Shares.")
 
INVESTMENT
OBJECTIVES              The investment objectives of the Funds are as follows:
 
                        The Intermediate-Term Bond Fund seeks total return
                      through investments in fixed-income securities.
 
                        The Bond Fund seeks current income through investments
                      in long-term, fixed-income securities.
 
                        The Government Securities Fund seeks to achieve total
                      return consistent with the preservation of capital by
                      investing in a diversified portfolio of obligations issued
                      or guaranteed by the U.S. government or its agencies or
                      instrumentalities.
 
                        The investment objectives and certain of the investment
                      limitations of the Intermediate-Term Bond Fund, the Bond
                      Fund, and the Government Securities Fund may not be
                      changed without a vote of the holders of a majority of the
                      outstanding Shares of the respective Fund (as defined
                      under GENERAL INFORMATION--Miscellaneous below). There can
                      be no assurance that a Fund will achieve its investment
                      objective.
 
INVESTMENT
POLICIES              Intermediate-Term Bond Fund
 
                        Under normal market conditions, at least 65% of the
                      Intermediate-Term Bond Fund's assets will be invested in
                      bonds. For purposes of this policy "bonds" include (i)
                      corporate bonds and debentures rated at the time of
                      purchase as "investment grade" (one of the four highest
                      bond rating categories by a nationally recognized
                      statistical rating organization ("NRSRO") i.e., AAA, AA,
                      A, or BBB by Standard & Poor's Corporation ("S&P") or Aaa,
                      Aa, A, or Baa by Moody's Investors Service ("Moody's")) or
                      determined by the Advisor to be of comparable quality;
                      (ii) Yankee Bonds and Eurodollar instruments; (iii) notes
                      or bonds
 
                                       10
<PAGE>   11
 
                      issued by the U.S. Government and its agencies and
                      instrumentalities (such as Government National Mortgage
                      Association ("GNMA") securities); (iv) mortgage-backed
                      securities, including privately issued mortgage-backed
                      securities and readily-marketable asset-backed securities,
                      which must be rated at the time of purchase as investment
                      grade, or be determined by the Advisor to be of comparable
                      quality; (v) securities issued or guaranteed by foreign
                      governments, their political subdivisions, agencies or
                      instrumentalities; (vi) obligations of supranational
                      entities such as the World Bank and the Asian Development
                      Bank; and (vii) zero coupon obligations. The remainder of
                      the Fund's assets may be invested in money market
                      instruments.
 
                        The dollar-weighted average portfolio maturity of the
                      Intermediate-Term Bond Fund will be from three to ten
                      years.
 
                      Bond Fund
 
                        The Bond Fund invests in fixed-income securities with
                      maturities in excess of one year, except for amounts held
                      in money market instruments. Fixed-income securities can
                      have maturities of up to thirty years or more. Under
                      normal market conditions, the Bond Fund will invest at
                      least 65% of the value of its total assets in bonds and
                      may invest up to 35% of its total assets in money market
                      instruments.
 
                        For purposes of this policy "bonds" include (i)
                      corporate bonds and debentures rated at the time of
                      purchase as investment grade or determined by the Advisor
                      to be of comparable quality; (ii) Yankee Bonds and
                      Eurodollar instruments; (iii) notes or bonds issued by the
                      U.S. Government and its agencies and instrumentalities
                      (such as GNMA securities); (iv) mortgage-backed
                      securities, including privately issued mortgage-backed
                      securities and readily-marketable asset-backed securities,
                      which must be rated at the time of purchase as investment
                      grade, or be determined by the Advisor to be of comparable
                      quality; (v) securities issued or guaranteed by foreign
                      governments, their political subdivisions, agencies or
                      instrumentalities; (vi) obligations of supranational
                      entities such as the World Bank and the Asian Development
                      Bank; and (vii) zero coupon obligations. The remainder of
                      the Fund's assets may be invested in money market
                      instruments.
 
                        The dollar-weighted average portfolio maturity of the
                      Bond Fund will be from five to twenty years.
 
                      Government Securities Fund
 
                        Under normal market conditions, the Government
                      Securities Fund will invest at least 80% of its assets in
                      obligations issued or guaranteed by the U.S. government or
                      its agencies or instrumentalities, including
                      mortgage-backed securities issued or guaranteed by U.S.
                      government agencies such as GNMA, the
 
                                       11
<PAGE>   12
 
                      Federal National Mortgage Association ("FNMA") or the
                      Federal Home Loan Mortgage Corporation ("FHLMC") and
                      repurchase agreements backed by such securities. The Fund
                      may invest any remaining assets in corporate bonds that
                      are rated at the time of purchase as investment grade or
                      determined by the Sub-Advisor to be of comparable quality;
                      Yankee Bonds, including sovereign, supranational and
                      Canadian bonds; shares of other investment companies with
                      similar investment objectives; commercial paper; money
                      market funds; privately issued mortgage-backed and other
                      readily-marketable asset-backed securities; and money
                      market instruments and cash.
 
                        The Sub-Advisor will seek to enhance the yield of the
                      Fund by taking advantage of yield disparities or other
                      factors that occur in the government securities and money
                      markets. The Fund may dispose of any security prior to its
                      maturity if such disposition and reinvestment of the
                      proceeds are expected to enhance its yield consistent with
                      the Sub-Advisor's judgment as to a desirable maturity
                      structure or if such disposition is believed to be
                      advisable due to other circumstances or considerations.
                      The Fund will seek to achieve capital gains by taking
                      advantage of price appreciation caused by interest rate
                      and credit quality changes.
 
GENERAL                 In the event that a security owned by the Fund is
                      downgraded below the stated rating categories, the Advisor
                      will take appropriate action with regard to that security.
 
                      Money Market Instruments
 
                        Under normal market conditions, the Intermediate-Term
                      Bond Fund and the Bond Fund may invest up to 35% of their
                      total assets in money market instruments, and the
                      Government Securities Fund may invest up to 20% of its
                      total assets in money market instruments. When market
                      conditions indicate a temporary "defensive" investment
                      strategy as determined by the Advisor, a Fund may invest
                      more than the above-stated percentages of its total assets
                      in money market instruments. A Fund will not be pursuing
                      its investment objective to the extent that a substantial
                      portion of its assets are invested in money market
                      instruments.
 
                      Illiquid and Restricted Securities
 
                        Each Fund shall limit investment in illiquid securities
                      to 15% or less of its net assets. Generally, an "illiquid
                      security" is any security that cannot be disposed of
                      promptly and in the ordinary course of business at
                      approximately the amount at which the Fund has valued the
                      instrument. The absence of a trading market can make it
                      difficult to ascertain the market value of illiquid
                      securities. The Fund may purchase restricted securities
                      which have not been registered under the Securities
 
                                       12
<PAGE>   13
 
                      Act of 1933 (e.g., Rule 144A Securities and Section 4(2)
                      commercial paper) subject to policies approved by the
                      Board of Trustees. See INVESTMENT RESTRICTIONS in the
                      Statement of Additional Information.
 
                      Lending of Portfolio Securities
 
                        In order to generate additional income, a Fund may lend
                      its portfolio securities to broker-dealers, banks or other
                      institutions. A Fund may lend portfolio securities in an
                      amount representing up to 33 1/3% of the value of the
                      Fund's total assets.
 
                      Other Investments
 
                        The Funds may enter into repurchase agreements and
                      reverse repurchase agreements.
 
                        The Fixed Income Funds may enter into forward
                      commitments or purchase securities on a "when-issued"
                      basis. Each Fixed Income Fund expects that commitments by
                      a Fund to enter into forward commitments or purchase when-
                      issued securities will not exceed 25% of the value of the
                      Fund's total assets under normal market conditions. The
                      Fixed Income Funds do not intend to purchase when-issued
                      securities or enter into forward commitments for
                      speculative or leveraging purposes but only for the
                      purpose of acquiring portfolio securities.
 
                        A Fund may invest up to 5% of its total assets in the
                      securities of any one registered investment company, but
                      may not own than 3% of the securities of any one
                      registered investment company or invest more than 10% of
                      its assets in the securities of other registered
                      investment companies. In accordance with an exemptive
                      order issued to HighMark by the SEC, such other registered
                      investment company securities may include registered
                      securities of a money market fund of HighMark, and such
                      companies may include companies for which the Advisor or a
                      Sub-Advisor to a Fund of HighMark, or an affiliate of such
                      Advisor or Sub-Advisor serves as investment advisor,
                      administrator or distributor. Because other registered
                      investment companies employ an investment advisor, such
                      investment by a Fund may cause Shareholders to bear
                      duplicative fees. The Advisor will waive its fees
                      attributable to the assets of the investing Fund invested
                      in a money market fund of HighMark, and, to the extent
                      required by applicable law, the Advisor will waive its
                      fees attributable to the assets of the Fund invested in
                      any investment company. Some Funds are subject to
                      additional restrictions on investment in other investment
                      companies. See "INVESTMENT RESTRICTIONS" in the Statement
                      of Additional Information.
 
                        A Fund may invest in futures and options on futures for
                      the purpose of achieving the Fund's objectives and for
                      adjusting portfolio duration. The Fund may invest in
                      futures and related options based on any type of security
                      or index traded on U.S. or foreign exchanges or over the
                      counter, as long as the underlying
 
                                       13
<PAGE>   14
 
                      security, or securities represented by an index, are
                      permitted investments of the Fund. The Fund may enter into
                      futures contracts and related options only to the extent
                      that obligations under such contracts or transactions
                      represent not more than 10% of the Fund's assets.
 
                        Certain of the obligations in which the Funds may invest
                      may be variable or floating rate instruments, may involve
                      a conditional or unconditional demand feature, and may
                      include variable amount master demand notes.
 
                        For further information, see "DESCRIPTION OF PERMITTED
                      INVESTMENTS."
 
                      Risk Factors
 
                        In addition to credit risk which relates to the ability
                      of an issuer to make payments of principal and interest,
                      all types of bonds are also subject to market risk. Market
                      risk relates to changes in a security's value as a result
                      of interest rate changes generally. An increase in
                      interest rates will generally reduce the value of the
                      investments in the Fixed Income Funds and a decline in
                      interest rates will generally increase the value of those
                      investments. Accordingly, the net asset value of the
                      Fund's shares will vary as a result of changes in the
                      value of the securities in a Fund's portfolio. Therefore,
                      an investment in the Funds may decline in value, resulting
                      in a loss of principal. Because interest rates vary, it is
                      impossible to predict the income or yield of the Fund for
                      any particular period.
 
                        Depending upon prevailing market conditions, the Fixed
                      Income Funds may purchase debt securities at a discount
                      from face value, which produces a yield greater than the
                      coupon rate. Conversely, if debt securities are purchased
                      at premium over face value, the yield will be lower than
                      the coupon rate. In making investment decisions, the
                      Advisor will consider many factors other than current
                      yield, including the preservation of capital, the
                      potential for realizing capital appreciation, maturity,
                      and yield to maturity.
 
                        Securities rated BBB by S&P or Baa by Moody's are
                      considered investment grade, but are deemed by these
                      rating services to have some speculative characteristics,
                      and adverse economic conditions or other circumstances are
                      more likely to lead to a weakened capacity to make
                      principal and interest payments than is the case with
                      higher grade bonds.
 
                        Each of the Fixed Income Funds may invest in securities
                      issued or guaranteed by foreign corporations or foreign
                      governments, their political subdivisions, agencies or
                      instrumentalities and obligations of supranational
                      entities such as the World Bank and the Asian Development
                      Bank. Any investments in these securities will be in
                      accordance with a Fund's investment objective and
                      policies, and are subject to special risks, such as
                      adverse political and economic develop-
 
                                       14
<PAGE>   15
 
                      ments, possible seizure, nationalization or expropriation
                      of foreign investments, less stringent disclosure
                      requirements, changes in foreign currency exchange rates,
                      increased costs associated with the conversion of foreign
                      currency into U.S. dollars, the possible establishment of
                      exchange controls or taxation at the source or the
                      adoption of other foreign governmental restrictions. To
                      the extent that a Fund may invest in securities of foreign
                      issuers that are not traded on any exchange, there is a
                      further risk that these securities may not be readily
                      marketable. The Fixed Income Funds will not hold foreign
                      currency for investment purposes.
 
                        For further information regarding risks of particular
                      permitted investments, see "DESCRIPTION OF PERMITTED
                      INVESTMENTS."
 
INVESTMENT
LIMITATIONS             Each Fund may not:
 
                        1) Purchase securities of any one issuer, other than
                      obligations issued or guaranteed by the U.S. Government,
                      its agencies, or instrumentalities, if, immediately after
                      the purchase, more than 5% of the value of such Fund's
                      total assets would be invested in the issuer or the Fund
                      would hold more than 10% of any class of securities of the
                      issuer or more than 10% of the issuer's outstanding voting
                      securities (except that up to 25% of the value of the
                      Fund's total assets may be invested without regard to
                      these limitations);
 
                        2) Purchase any securities that would cause more than
                      25% of such Fund's total assets at the time of purchase to
                      be invested in securities of one or more issuers
                      conducting their principal business activities in the same
                      industry, provided that (a) there is no limitation with
                      respect to obligations issued or guaranteed by the U.S. or
                      foreign governments or their agencies or instrumentalities
                      and repurchase agreements secured by obligations of the
                      U.S. Government or its agencies or instrumentalities; (b)
                      wholly owned finance companies will be considered to be in
                      the industries of their parents if their activities are
                      primarily related to financing the activities of their
                      parents; and (c) utilities will be divided according to
                      their services (for example, gas, gas transmission,
                      electric and gas, electric, and telephone will each be
                      considered a separate industry); and
 
                        3) Make loans, except that a Fund may purchase or hold
                      debt instruments, lend portfolio securities, and enter
                      into repurchase agreements as permitted by its investment
                      objective and policies.
 
                        The foregoing percentages will apply at the time of the
                      purchase of a security. The investment limitations listed
                      above are fundamental policies and may not be changed
                      without a vote of a majority of the outstanding Shares of
                      the respective Fund. Additional fundamental and
                      non-fundamental investment limitations are set forth in
                      the Statement of Additional Information.
 
                                       15
<PAGE>   16
 
PORTFOLIO
TURNOVER                A Fund will not purchase securities solely for the
                      purpose of short-term trading nor will the Fund's
                      portfolio turnover rate be a factor preventing a sale or
                      purchase when the Advisor believes investment
                      considerations warrant. Each of the Fixed Income Fund's
                      portfolio turnover rate may vary greatly from year to year
                      as well as within a particular year. High portfolio
                      turnover rates generally will result in correspondingly
                      higher brokerage and other transactions costs to the Fixed
                      Income Funds and could involve the realization of capital
                      gains that would be taxable when distributed to
                      shareholders of the relevant Fixed Income Fund. See
                      FEDERAL TAXATION.
 
PURCHASE AND
REDEMPTION
OF SHARES               As noted above, each Fund (except the Government
                      Securities Fund, which is offered in only Fiduciary
                      Shares) is divided into two classes of Shares, Retail and
                      Fiduciary. Fiduciary Shares may be purchased at net asset
                      value. Only the following investors qualify to purchase
                      the Fixed Income Funds' Fiduciary Shares: (i) fiduciary,
                      advisory, agency, custodial and other similar accounts
                      maintained with Union Bank of California, N.A. or its
                      affiliates; (ii) Select IRA accounts established with The
                      Bank of California, N.A. and invested in any of HighMark's
                      Equity or Fixed Income Funds prior to June 20, 1994, which
                      have remained continuously open thereafter and which are
                      not considered to be fiduciary accounts; (iii)
                      Shareholders who currently own Shares of HighMark's Equity
                      or Fixed Income Funds that were purchased prior to June
                      20, 1994 within an account registered in their name with
                      the Funds; and (iv) present and retired directors,
                      officers and employees (and their spouses and children
                      under the age of 21) of Union Bank of California, N.A.,
                      HighMark's current or former distributors or their
                      respective affiliated companies who currently own Shares
                      of HighMark Funds which were purchased before April 30,
                      1997. For a description of investors who qualify to
                      purchase Retail Shares, see the Retail Shares prospectus
                      of the Fixed Income Funds.
 
                        Purchases and redemptions of Shares of the Fixed Income
                      Funds may be made on days on which both the New York Stock
                      Exchange and Federal Reserve wire system are open for
                      business ("Business Days"). The minimum initial investment
                      is generally $1,000 and the minimum subsequent investment
                      is generally $100. For present and retired directors,
                      officers, and employees (and their spouses and children
                      under the age of 21) of Union Bank of California, SEI
                      Financial Services Company and their affiliates, the
                      minimum initial investment is $250 and the minimum
                      subsequent investment is $50. A Fund's initial and
                      subsequent minimum purchase amounts may be waived in the
                      Distributor's discretion if purchases are made in
                      connection with Individual Retirement Accounts, Keoghs,
                      payroll deduction plans, 401(k) or similar programs or
                      accounts. However, the minimum investment may be waived.
                      Shareholders may place orders by telephone.
 
                                       16
<PAGE>   17
 
                        Purchase orders will be effective if the Distributor
                      receives an order before 1:00 p.m., Pacific time (4:00
                      p.m., Eastern time) and the Custodian receives Federal
                      funds before the close of business on the next Business
                      Day. The purchase price of Shares of a Fund is the net
                      asset value next determined after a purchase order is
                      received and accepted by HighMark. The net asset value per
                      Share of a Fund is determined by dividing the total market
                      value of a Fund's investments and other assets, less any
                      liabilities, by the total number of outstanding Shares of
                      a Fund. Net asset value per share is determined daily as
                      of 1:00 p.m., Pacific time (4:00 p.m., Eastern time) on
                      any Business Day. Purchases will be made in full and
                      fractional shares of HighMark calculated to three decimal
                      places. HighMark reserves the right to reject a purchase
                      order when the Distributor of the Advisor determines that
                      it is not in the best interest of HighMark and/or its
                      Shareholders to accept such order.
 
                        Shares of the Funds are offered only to residents of
                      states in which the Shares are eligible for purchase.
 
                        Shareholders who desire to redeem shares of HighMark
                      must place their redemption orders prior to 1:00 p.m.,
                      Pacific time (4:00 p.m., Eastern time), on any Business
                      Day for the order to be accepted on that Business Day. The
                      redemption price is the net asset value of the Fund next
                      determined after receipt by the Distributor of the
                      redemption order. Payment on redemption will be made as
                      promptly as possible and, in any event, within seven
                      calendar days after the redemption order is received. The
                      Funds reserve the right to make payment on redemptions in
                      securities rather than cash.
 
                        Neither HighMark's transfer agent nor HighMark will be
                      responsible for any loss, liability, cost or expense for
                      acting upon wire instructions or upon telephone
                      instructions that it reasonably believes to be genuine.
                      HighMark and its transfer agent will each employ
                      reasonable procedures to confirm that telephone
                      instructions are genuine. Such procedures may include
                      taping of telephone conversations. If market conditions
                      are extraordinarily active or other extraordinary
                      circumstances exist, and you experience difficulties
                      placing redemption orders by telephone, you may wish to
                      consider placing your order by other means.
 
EXCHANGE
PRIVILEGES              As indicated under GENERAL INFORMATION--Description of
                      HighMark & Its Shares, certain of HighMark's Funds issues
                      two classes of Shares (Retail Shares and Fiduciary
                      Shares); as of the date of this Prospectus, the
                      Distribution Plan and distribution fee payable thereunder
                      are applicable only to each Fund's Retail Shares. A
                      Shareholder's eligibility to exchange into a particular
                      class of Shares will be determined at the time of the
                      exchange. The Shareholder must supply, at the time of the
                      exchange, the necessary information to permit confirmation
                      of qualification.
 
                                       17
<PAGE>   18
 
                        Each Fund's Shares may be exchanged for Shares of the
                      class of the various other Funds of HighMark which the
                      Shareholder qualifies to purchase directly so long as the
                      Shareholder maintains the applicable minimum account
                      balance in each Fund in which he or she owns Shares and
                      satisfies the minimum initial and subsequent purchase
                      amounts of the Fund into which the Shares are exchanged.
                      Shareholders may exchange their Fiduciary Shares for
                      Fiduciary Shares of another Fund on the basis of the
                      relative net asset value of the Fiduciary Shares
                      exchanged. Shareholders may also exchange Fiduciary Shares
                      of a Fund for Retail Shares of another Fund. Under such
                      circumstances, the cost of the acquired Retail Shares will
                      be the net asset value per share plus the appropriate
                      sales load.
 
                        Exchanges will be made on the basis of the relative net
                      asset values of the Shares exchanged plus any applicable
                      sales charge. Exchanges are subject to the terms and
                      conditions stated herein and the terms and conditions
                      stated in the respective prospectuses of the Funds.
 
                        Certain entities (including Participating Organizations
                      and Union Bank of California and its affiliates), however,
                      may charge customers a fee with respect to exchanges made
                      on the customer's behalf. Information about these charges,
                      if any, can be obtained by the entity effecting the
                      exchange and this Prospectus should be read in conjunction
                      with that information.
 
                        A Shareholder wishing to exchange Shares in a Fixed
                      Income Fund may do so by contacting the Transfer Agent at
                      1-800-433-6884. Exchanges will be effected on any Business
                      Day at the net asset value of the Funds involved in the
                      exchange next determined after the exchange request is
                      received by the Transfer Agent.
 
                        An exchange is considered to be a sale of Shares for
                      federal income tax purposes on which a Shareholder may
                      realize a capital gain or loss. Exchange privileges may be
                      exercised only in those states where Shares of such other
                      Funds of HighMark may legally be sold. HighMark may
                      materially amend or terminate the exchange privileges
                      described herein upon sixty days' notice.
 
DIVIDENDS               The net income of each of the Fixed Income Funds is
                      declared and paid monthly as a dividend to Shareholders of
                      record at the close of business on the day of declaration.
                      Net realized capital gains are distributed at least
                      annually to Shareholders of record.
 
                        Shareholders will automatically receive all income
                      dividends and capital gains distributions in additional
                      full and fractional Shares of a Fund at net asset value as
                      of the date of declaration (which is also the ex-dividend
                      date), unless the Shareholder elects to receive such
                      dividends or distributions in cash. Shareholders wishing
                      to receive their dividends in cash (or wishing to revoke a
                      previously made
 
                                       18
<PAGE>   19
 
                      election) must notify the transfer agent at P.O. Box 8416,
                      Boston, MA 02266-8416, and such election (or revocation
                      thereof) will become effective with respect to dividends
                      and distributions having record dates after notice has
                      been received. Dividends paid in additional Shares receive
                      the same tax treatment as dividends paid in cash.
 
FEDERAL
TAXATION                Each Fixed Income Fund intends to qualify for treatment
                      as a "regulated investment company" under the Internal
                      Revenue Code of 1986, as amended (the "Code"), and to
                      distribute substantially all of its net investment income
                      and net realized capital gains so that each Fund is not
                      required to pay federal taxes on these amounts. Because
                      all of the net investment income of the Fixed Income Funds
                      is expected to be derived from interest, it is anticipated
                      that no part of any distribution will be eligible for the
                      federal dividends received deduction.
 
                        Distributions of ordinary income and/or an excess of net
                      short-term capital gain over net long-term capital loss
                      are treated for federal income tax purposes as ordinary
                      income to Shareholders. Distributions by the Fund of the
                      excess of net long-term capital gain over net short-term
                      capital loss is taxable to Shareholders as long-term
                      capital gain in the year with respect to which it is
                      received, regardless of how long the Shareholder has held
                      Shares of the Fund. Such distributions are not eligible
                      for the dividends received deduction. If a Shareholder
                      disposes of Shares in a Fund at a loss before holding such
                      Shares for longer than six months, such loss will be
                      treated as a long-term capital loss to the extent the
                      Shareholder has received long-term capital gain dividends
                      on the Shares.
 
                        Prior to purchasing Shares of the Fixed Income Funds,
                      the impact of dividends or capital gain distributions that
                      are expected to be declared or have been declared, but not
                      paid, should be carefully considered. Dividends or capital
                      gain distributions received after a purchase of Shares are
                      subject to federal income taxes, although in some
                      circumstances, the dividends or distributions may be, as
                      an economic matter, a return of capital to the
                      Shareholder. A Shareholder should consult his or her
                      advisor for specific advice about the tax consequences to
                      the Shareholder of investing in a Fund.
 
                        Fund investments in foreign securities may be subject to
                      withholding taxes at the source on dividend or interest
                      payments. In that case, the Fund's yield on those
                      securities would be decreased. The Fund does not expect to
                      be eligible to elect to permit shareholders to claim a
                      credit or deduction on their income tax return for their
                      pro rata share of such taxes.
 
                        Fund transactions in foreign currencies and hedging
                      activities may give rise to ordinary income or loss to the
                      extent such income or loss results from fluctuations in
                      value of the foreign currency concerned. In addition, such
                      activities will likely produce a difference between book
                      income and taxable income. This difference
 
                                       19
<PAGE>   20
 
                      may cause a portion of the Fund's income distributions to
                      constitute a return of capital for tax purposes or require
                      the Fund to make distributions exceeding book income to
                      qualify as a regulated investment company for tax
                      purposes.
 
                        Additional information regarding federal taxes is
                      contained in the Statement of Additional Information.
                      However, the foregoing and the material in the Statement
                      of Additional Information are only brief summaries of some
                      of the important tax considerations generally affecting
                      each Fund and its Shareholders. In addition, the foregoing
                      discussion and the federal tax information in the
                      Statement of Additional Information are based on tax laws
                      and regulations which are in effect as of the date of this
                      Prospectus; these laws and regulations may subsequently
                      change, and such changes could be retroactive.
 
                        Shareholders will be advised at least annually as to the
                      federal income tax status of distributions made during the
                      year.
 
SERVICE
ARRANGEMENTS          The Advisor
 
                        Pacific Alliance Capital Management, a division of Union
                      Bank of California, serves as the Fixed Income Funds'
                      investment advisor. Subject to the general supervision of
                      HighMark's Board of Trustees, the Advisor manages each
                      Fund in accordance with its investment objective and
                      policies, makes decisions with respect to and places
                      orders for all purchases and sales of the Fund's
                      investment securities, and maintains the Fund's records
                      relating to such purchases and sales.
 
                        For the expenses assumed and services provided by the
                      Advisor as each Fund's investment advisor, Union Bank of
                      California receives a fee from the Intermediate-Term Bond
                      Fund, the Bond Fund, and the Government Securities Fund
                      computed daily and paid monthly, at the annual rate of
                      fifty one-hundredths of one percent (.50%) of the Fund's
                      average daily net assets. Depending on the size of the
                      Fund, this fee may be higher than the advisory fee paid by
                      most mutual funds, although the Board of Trustees believes
                      it will be comparable to advisory fees paid by many funds
                      having similar objectives and policies. Union Bank of
                      California may from time to time agree to voluntarily
                      reduce its advisory fee, however, it is not currently
                      doing so. While there can be no assurance that Union Bank
                      of California will choose to make such an agreement, any
                      voluntary reductions in Union Bank of California's
                      advisory fee will lower the Fund's expenses, and thus
                      increase the Fund's yield and total return, during the
                      period such voluntary reductions are in effect. During
                      HighMark's fiscal year ended July 31, 1996, Union Bank of
                      California received investment advisory fees from the Bond
                      Fund aggregating 0.45% of the Fund's average daily net
                      assets. As of the date of this prospectus, the
                      Intermediate-Term Bond Fund and the Government Securities
                      Fund had not yet commenced operations in HighMark.
 
                                       20
<PAGE>   21
 
                        On April 1, 1996, The Bank of California, N.A.,
                      HighMark's then investment advisor, combined with Union
                      Bank and the resulting bank changed its name to Union Bank
                      of California, N.A. At the same time, the banks'
                      investment management divisions were combined. Each of
                      Union Bank and The Bank of California, N.A. (or their
                      predecessor banks) has been in banking since the early
                      1900's and, historically, each has had significant
                      investment functions within its trust and investment
                      division. UnionBanCal Corporation, the parent of Union
                      Bank of California, N.A., is a publicly held corporation,
                      but is principally held by The Bank of Tokyo-Mitsubishi,
                      Ltd. As of September 30, 1996, Union Bank of California
                      and its subsidiaries had approximately $28.7 billion in
                      commercial assets. Pacific Alliance Capital Management is
                      a division of Union Bank of California's Trust and
                      Investment Management Group, which, as of June 30, 1996,
                      had approximately $13.4 billion of assets under
                      management. The Advisor, with a team of approximately 45
                      stock and bond research analysts, portfolio managers and
                      traders, has been providing investment management services
                      to individuals, institutions and large corporations since
                      1917.
 
                        All investment decisions for the Fixed Income Funds are
                      made by a team of investment professionals, all of whom
                      take an active part in the decision making process. The
                      team leader for both the Intermediate-Term Bond Fund and
                      the Bond Fund is E. Jack Montgomery. Mr. Montgomery is a
                      Vice President of the Advisor and has served as the
                      portfolio manager of the Bond Fund since June, 1994. Prior
                      to joining the Advisor, Mr. Montgomery was employed by the
                      San Francisco Employees' Retirement System and, prior to
                      that, First Interstate Bank of Oregon. Mr. Montgomery
                      graduated from the University of Oklahoma in 1971 and
                      earned his M.B.A. from the University of Oregon.
                      Investment decisions for the Government Securities Fund
                      are primarily made by the Sub-Advisor as described below.
 
                      The Sub-Advisor
 
                        The Advisor and Bank of Tokyo-Mitsubishi Trust Company
                      (the "Sub-Advisor") have entered into an investment
                      sub-advisory agreement relating to the Government
                      Securities Fund (the "Investment Sub-Advisory Agreement").
                      Under the Investment Sub-Advisory Agreement, the
                      Sub-Advisor makes the day-to-day investment decisions for
                      the assets of the Government Securities Fund, subject to
                      the supervision of and policies established by the Advisor
                      and the Trustees of HighMark.
 
                        Bank of Tokyo-Mitsubishi Trust Company, headquartered at
                      1251 Avenue of the Americas, New York, New York 10116,
                      operates as a wholly-owned subsidiary of The Bank of
                      Tokyo-Mitsubishi, Limited. The Sub-Advisor was formed by
                      the combination on April 1, 1996 of Bank of Tokyo Trust
                      Company, a wholly-owned subsidiary of the Bank of Tokyo,
                      Ltd., and Mitsubishi Bank Trust
 
                                       21
<PAGE>   22
 
                      Company of New York, a wholly-owned subsidiary of The
                      Mitsubishi Bank, Ltd. Bank of Tokyo Trust Company was the
                      surviving entity, and changed its name to Bank of
                      Tokyo-Mitsubishi Trust Company. Bank of Tokyo Trust
                      Company was established in 1955 and has provided trust
                      services since that time and management services since
                      1965.
 
                        The Sub-Advisor serves as portfolio manager to bank
                      common funds, employee benefit funds and personal trust
                      accounts, managing assets in money market, equity and
                      fixed income portfolios. As of June 30, 1996, the
                      Sub-Advisor managed $700 million in individual portfolios
                      and collective funds. In addition, the Sub-Advisor also
                      serves as Sub-Advisor to HighMark's Convertible
                      Securities, Emerging Growth and Blue Chip Growth Funds.
 
                        The Sub-Advisor is entitled to a fee, which is
                      calculated daily and paid monthly out of the Advisor's
                      fee, at an annual rate of .20% of the average daily net
                      assets of the Government Securities Fund. As of the date
                      of this prospectus, the Government Securities Fund had not
                      yet commenced operations in HighMark.
 
                        Stephen W. Blocklin will serve as portfolio manager of
                      the Government Securities Fund. Mr. Blocklin has been a
                      Vice President with the Sub-Advisor and its predecessor,
                      Bank of Tokyo Trust Company since December, 1993. From
                      September 1988 to December, 1993, he served as a senior
                      fixed income fund manager in the institutional investment
                      management group at First Fidelity Bancorporation.
 
                      Administrator
 
                        SEI Fund Resources (the "Administrator") and HighMark
                      are parties to an administration agreement (the
                      "Administration Agreement"). Under the terms of the
                      Administration Agreement, the Administrator provides
                      HighMark with certain management services, including all
                      necessary office space, equipment, personnel, and
                      facilities.
 
                        The Administrator is entitled to a fee, which is
                      calculated daily and paid monthly, at an annual rate of
                      .20% of the average daily net assets of the Funds. The
                      Administrator may waive its fee or reimburse various
                      expenses to the extent necessary to limit the total
                      operating expenses of a Fund's Fiduciary Shares. Any such
                      waiver is voluntary and may be terminated at any time in
                      the Administrator's sole discretion. Currently, the
                      Administrator has agreed to waive its fee to the rate of
                      .18% of the average daily net assets of the Funds.
 
                        Pursuant to a separate agreement with the Administrator,
                      Union Bank of California, N.A. performs sub-administration
                      services on behalf of each Fund, for which it receives a
                      fee paid by the Administrator at the annual rate of up to
                      0.05%
 
                                       22
<PAGE>   23
 
                      of the average daily net assets of the Funds. Union Bank
                      of California has voluntarily agreed to reduce this fee to
                      0.03%, but reserves the right to terminate its waiver at
                      any time in its sole discretion. A description of the
                      services performed by Union Bank of California pursuant to
                      this Agreement is contained in the Statement of Additional
                      Information.
 
                      The Transfer Agent
 
                        State Street Bank and Trust Company serves as the
                      transfer agent, dividend disbursing agent, and as a
                      shareholder servicing agent for the Fiduciary Shares of
                      HighMark, for which services it receives a fee.
 
                      Shareholder Service Plan
 
                        To support the provision of Shareholder services to both
                      classes of Shares, HighMark has adopted a Shareholder
                      Service Plan. A description of the services performed by
                      service providers pursuant to the Shareholder Service Plan
                      is contained in the Statement of Additional Information.
                      In consideration of services provided by any service
                      provider, which may include Union Bank of California,
                      N.A., Bank of Tokyo-Mitsubishi, Ltd., or their respective
                      affiliates, each Fund may pay a fee at the rate of up to
                      0.25% of its average daily net assets to such service
                      provider. The service provider may waive such fees at any
                      time. Any such waiver is voluntary and may be terminated
                      at any time. Currently, such fees are being waived to the
                      rate of 0.03% of average daily net assets for the
                      Intermediate-Term Bond Fund, 0.01% of the average daily
                      net assets for the Bond Fund, and 0.00% of the average
                      daily net assets for the Government Securities Fund.
 
                      Distributor
 
                        SEI Financial Services Company (the "Distributor") and
                      HighMark are parties to a distribution agreement
                      ("Distribution Agreement"). The Distribution Agreement is
                      renewable annually and may be terminated by the
                      Distributor, by a majority vote of the Disinterested
                      Trustees or by a majority vote of the outstanding
                      securities of HighMark upon not more than 60 days written
                      notice by either party, or upon assignment by the
                      Distributor. Fiduciary Shares are not subject to
                      HighMark's Distribution Plan or a distribution fee.
 
                      Banking Laws
 
                        Union Bank of California believes that it may perform
                      the services for the Funds contemplated by its investment
                      advisory agreement with HighMark without a violation of
                      applicable banking laws and regulations. Union Bank of
                      California also believes that it may perform
                      sub-administration and sub-accounting services on behalf
                      of each Fund, for which it receives compensation from SEI
                      Fund Resources, without a violation of applicable banking
                      laws and regulations.
 
                                       23
<PAGE>   24
 
                      Future changes in federal or state statutes and
                      regulations relating to permissible activities of banks or
                      bank holding companies and their subsidiaries and
                      affiliates, as well as further judicial or administrative
                      decisions or interpretations of present and future
                      statutes and regulations, could change the manner in which
                      Union Bank of California or the Advisor could continue to
                      perform such services for the Funds. For a further
                      discussion of applicable banking laws and regulations, see
                      the Statement of Additional Information.
 
                      Custodian
 
                        Union Bank of California also serves as the custodian
                      and as a shareholder servicing agent for the Fixed Income
                      Funds. The Custodian holds cash securities and other
                      assets of HighMark as required by the 1940 Act.
 
                        Services performed by Union Bank of California, as the
                      Funds' shareholder servicing agent and custodian, as well
                      as the basis of remuneration for such services, are
                      described in the Statement of Additional Information.
 
GENERAL
INFORMATION           Description of HighMark & Its Shares
 
                        HighMark was organized as a Massachusetts business trust
                      on March 10, 1987, and consists of sixteen series of
                      Shares open for investment representing units of
                      beneficial interest in HighMark's Growth Fund, Income
                      Equity Fund, Balanced Fund, Value Momentum Fund, Blue Chip
                      Growth Fund, Emerging Growth Fund, International Equity
                      Fund, Bond Fund, Intermediate-Term Bond Fund, Government
                      Securities Fund, Convertible Securities Fund, California
                      Intermediate Tax-Free Bond Fund, Diversified Money Market
                      Fund, U.S. Government Obligations Money Market Fund, 100%
                      U.S. Treasury Obligations Money Market Fund and California
                      Tax-Free Money Market Fund. As of the date hereof, no
                      Shares of the Value Momentum Fund, the Blue Chip Growth
                      Fund, the Emerging Growth Fund, the International Equity
                      Fund, the Intermediate-Term Bond Fund, the Convertible
                      Securities Fund, the Government Securities Fund, and the
                      California Intermediate Tax-Free Bond Fund, had been
                      offered for sale in HighMark. Shares of each Fund are
                      freely transferable, are entitled to distributions from
                      the assets of the Fund as declared by the Board of
                      Trustees, and, if HighMark were liquidated, would receive
                      the net assets attributable to that Fund. Shares are
                      without par value.
 
                        As noted above, pursuant to a Multiple Class Plan on
                      file with the Securities and Exchange Commission
                      permitting the issuance and sale of two classes of Shares
                      in selected Funds, Shares of such Funds have been divided
                      into two classes, designated Retail Shares and Fiduciary
                      Shares. For information regarding the Retail Shares of the
                      Fixed Income Funds, interested persons may contact the
                      Distributor for a prospectus at 1-800-433-6884.
 
                                       24
<PAGE>   25
 
                        HighMark believes that as of November 22, 1996, Union
                      Bank of California (475 Sansome Street, Post Office Box
                      45000, San Francisco, CA 94104) was the Shareholder of
                      record of 88.27% of the Fiduciary Shares of the Bond Fund.
                      As of November 22, 1996, the Intermediate-Term Bond Fund
                      and the Government Securities Fund had not yet commenced
                      operations in HighMark.
 
                      Performance Information
 
                        From time to time, HighMark may advertise the aggregate
                      total return, average annual total return, yield and
                      distribution rate with respect to the Fiduciary Shares of
                      each Fixed Income Fund. Performance information is
                      computed separately for a Fund's Retail and Fiduciary
                      Shares in accordance with the formulas described below.
 
                        The aggregate total return and average annual total
                      return of the Fixed Income Funds may be quoted for the
                      life of each Fund and for ten-year, five-year and one-year
                      periods, in each case through the most recent calendar
                      quarter. Aggregate total return is determined by
                      calculating the change in the value of a hypothetical
                      $1,000 investment in a Fund over the applicable period
                      that would equate the initial amount invested to the
                      ending redeemable value of the investment. The ending
                      redeemable value includes dividends and capital gain
                      distributions reinvested at net asset value. Average
                      annual total return is calculated by annualizing a Fund's
                      aggregate total return over the relevant number of years.
                      The resulting percentage indicates the average positive or
                      negative investment results that an investor in a Fund
                      would have experienced on an annual basis from changes in
                      Share price and reinvestment of dividends and capital gain
                      distributions.
 
                        The yield of a Fund is determined by annualizing the net
                      investment income per Share of the Fund during a specified
                      thirty-day period and dividing that amount by the per
                      Share public offering price of the Fund on the last day of
                      the period.
 
                        The distribution rate of a Fund is determined by
                      dividing the income and capital gains distributions, or
                      where indicated the income distributions alone, on a Share
                      of the Fund over a twelve-month period by the per Share
                      public offering price of the Fund on the last day of the
                      period.
 
                        Each Fund may periodically compare its performance to
                      the performance of other mutual funds tracked by mutual
                      fund rating services (such as Lipper Analytical),
                      financial and business publications and periodicals; broad
                      groups of comparable mutual funds; unmanaged indices which
                      may assume investment of dividends but generally do not
                      reflect deductions for administrative and management
                      costs; or other investment alternatives. Certain Funds may
                      advertise
 
                                       25
<PAGE>   26
 
                      performance that includes results from periods in which
                      the Fund's assets were managed in a non-registered
                      predecessor vehicle.
 
                        All performance information presented for a Fund is
                      based on past performance and does not predict future
                      performance.
 
                      Miscellaneous
 
                        Shareholders will be sent unaudited semi-annual reports
                      and annual reports audited by independent public
                      accountants.
 
                        Shareholders are entitled to one vote for each Share
                      held in a Fund as determined on the record date for any
                      action requiring a vote by the Shareholders, and a
                      proportionate fractional vote for each fractional Share
                      held. Shareholders of HighMark will vote in the aggregate
                      and not by series or class except (i) as otherwise
                      expressly required by law or when HighMark's Board of
                      Trustees determines that the matter to be voted upon
                      affects only the interests of the Shareholders of a
                      particular series or particular class, and (ii) only
                      Retail Shares will be entitled to vote on matters
                      submitted to a Shareholder vote relating to the
                      Distribution Plan. HighMark is not required to hold
                      regular annual meetings of Shareholders, but may hold
                      special meetings from time to time.
 
                        HighMark's Trustees are elected by Shareholders, except
                      that vacancies may be filled by vote of the Board of
                      Trustees. Trustees may be removed by the Board of
                      Trustees, or by Shareholders at a meeting called for such
                      purpose. For information about how Shareholders may call
                      such a meeting and communicate with other Shareholders for
                      that purpose, see ADDITIONAL INFORMATION--Miscellaneous in
                      the Statement of Additional Information.
 
                        Inquiries may be directed in writing to SEI Financial
                      Services Company, Oaks, Pennsylvania 19456, or by calling
                      toll free 1-800-433-6884.
 
DESCRIPTION OF
PERMITTED
INVESTMENTS             The following is a description of permitted investments
                      for the HighMark Fixed Income Funds.
 
                        ASSET-BACKED SECURITIES (NON-MORTGAGE)--Debt Instruments
                      secured by company receivables, truck and auto loans,
                      leases, and credit card receivables. Such securities are
                      generally issued as pass-through certificates, which
                      represent undivided fractional ownership interests in the
                      underlying pools of assets. Such securities also may be
                      debt instruments, which are also known as collateralized
                      obligations and are generally issued as the debt of a
                      special purpose entity, such as a trust, organized solely
                      for the purpose of owning such assets and issuing such
                      debt. The purchase of non-mortgage asset-backed securities
                      raises risk considerations peculiar to the financing of
                      the instruments underlying such securities. Asset-backed
                      securities entail prepayment risk, which may vary
 
                                       26
<PAGE>   27
 
                      depending on the type of asset, but is generally less than
                      the prepayment risk associated with mortgage-backed
                      securities.
 
                        Like mortgages underlying mortgage-backed securities,
                      underlying automobile sales contracts or credit card
                      receivables are subject to substantial prepayment risk,
                      which may reduce the overall return to certificate
                      holders. Nevertheless, principal prepayment rates tend not
                      to vary as much in response to changes in interest rates
                      and the short-term nature of the underlying car loans or
                      other receivables tend to dampen the impact of any change
                      in the prepayment level. Certificate holders may also
                      experience delays in payment on the certificates if the
                      full amounts due on underlying sales contracts or
                      receivables are not realized by the trust because of
                      unanticipated legal or administrative costs of enforcing
                      the contracts or because of depreciation or damage to the
                      collateral (usually automobiles) securing certain
                      contracts, or other factors. If consistent with their
                      investment objectives and policies, the Fixed Income Funds
                      may invest in other asset-backed securities that may be
                      developed in the future.
 
                        BANKERS' ACCEPTANCES--Bills of exchange or time drafts
                      drawn on and accepted by commercial banks. They are used
                      by corporations to finance the shipment and storage of
                      goods and to furnish dollar exchange. Maturities are
                      generally six months or less.
 
                        CERTIFICATES OF DEPOSIT--Negotiable interest-bearing
                      instruments with a specific maturity. Certificates of
                      deposit are issued by banks and savings and loan
                      institutions in exchange for the deposit of funds and
                      normally can be traded in the secondary market prior to
                      maturity.
 
                        COMMERCIAL PAPER--Unsecured short-term promissory notes
                      issued by corporations and other entities. Maturities on
                      these issues vary from a few days to nine months. Purchase
                      of such instruments involves a risk of default by the
                      issuer.
 
                        CONVERTIBLE BONDS AND CONVERTIBLE PREFERRED
                      STOCK--Convertible Bonds are bonds convertible into a set
                      number of shares of another form of security (usually
                      common stock) at a prestated price. Convertible bonds have
                      characteristics similar to both fixed-income and equity
                      securities. Convertible preferred stock is a class of
                      capital stock that pays dividends at a specified rate and
                      that has preference over common stock in the payment of
                      dividends and the liquidation of assets. Convertible
                      preferred stock is preferred stock exchangeable for a
                      given number of common stock shares, and has
                      characteristics similar to both fixed-income and equity
                      securities. Because of the conversion feature, the market
                      value of convertible bonds and convertible preferred stock
                      tend to move together with the market value of the
                      underlying stock. As a result, a Fund's selection of
                      convertible bonds and convertible preferred stock is
                      based, to a great extent, on the potential for capital
                      appreciation that may
 
                                       27
<PAGE>   28
 
                      exist in the underlying stock. The value of convertible
                      bonds and convertible preferred stock is also affected by
                      prevailing interest rates, the credit quality of the
                      issuer and any call provisions.
 
                        DERIVATIVES--Instruments whose value is derived from an
                      underlying contract, index or security, or any combination
                      thereof, including futures, options (e.g., puts and
                      calls), options on futures, swap agreements, and some
                      mortgage-backed securities (CMOs, REMICs, IOs and POs).
                      See elsewhere in this "DESCRIPTION OF PERMITTED
                      INVESTMENTS" for discussions of these various instruments,
                      and see "INVESTMENT OBJECTIVES" and "INVESTMENT POLICIES"
                      for more information about any policies and limitations
                      applicable to their use.
 
                        FUTURES AND OPTIONS ON FUTURES--Some futures strategies,
                      including selling futures, buying puts and writing calls,
                      reduce a Fund's exposure to price fluctuations. Other
                      strategies, including buying futures, writing puts and
                      buying calls, tend to increase market exposure. Futures
                      and options may be combined with each other in order to
                      adjust the risk and return characteristics of the overall
                      portfolio.
 
                        Options and futures can be volatile instruments, and
                      involve certain risks that, if applied at an inappropriate
                      time, could negatively impact a Fund's return.
 
                        INVESTMENT GRADE BONDS--Interest-bearing or discounted
                      government or corporate securities that obligate the
                      issuer to pay the bondholder a specified sum of money,
                      usually at specific intervals, and to repay the principal
                      amount of the loan at maturity. Investment grade bonds are
                      those rated BBB or better by S&P or Baa or better by
                      Moody's or similarly rated by other NRSROs, or, if not
                      rated, determined to be of comparable quality by the
                      Advisor.
 
                        LOAN PARTICIPATIONS--Loan participations are interests
                      in loans to U.S. corporations (i.e., borrowers) which are
                      administered by the lending bank or agent for a syndicate
                      of lending banks, and sold by the lending bank or
                      syndicate member ("intermediary bank"). In a loan
                      participation, the borrower of the underlying loan will be
                      deemed to be the issuer of the participation interest
                      (except to the extent a purchasing Fund derives its rights
                      from the intermediary bank). Because the intermediary bank
                      does not guarantee a loan participation in any way, a loan
                      participation is subject to the credit risks associated
                      with the underlying corporate borrower. In addition, in
                      the event the underlying corporate borrower fails to pay
                      principal and interest when due, a Fund may encounter
                      delays, expenses and risks that are greater than those
                      that would have been involved if the Fund had purchased a
                      direct obligation (such as commercial paper) of such
                      borrower because it may be necessary under the terms of
                      the loan participation, for the Fund to assert its rights
                      against the borrower through the
 
                                       28
<PAGE>   29
 
                      intermediary bank. Moreover, under the terms of a loan
                      participation, the purchasing Fund may be regarded as a
                      creditor of the intermediary bank (rather than of the
                      underlying corporate borrower), so that a Fund may also be
                      subject to the risk that the issuing bank may become
                      insolvent. Further, in the event of the bankruptcy or
                      insolvency of the corporate borrower, a loan participation
                      may be subject to certain defenses that can be asserted by
                      such borrower as a result of improper conduct by the
                      issuing bank. The secondary market, if any, for these loan
                      participations is limited, and any such participation
                      purchased by a Fund may be regarded as illiquid.
 
                        MONEY MARKET INSTRUMENTS--Short-term, debt instruments
                      or deposits and may include, for example, (i) commercial
                      paper rated within the highest rating category by a NRSRO
                      at the time of investment, or, if not rated, determined by
                      the Advisor to be of comparable quality; (ii) obligations
                      (certificates of deposit, time deposits, bank master
                      notes, and bankers' acceptances) of thrift institutions,
                      savings and loans, U.S. commercial banks (including
                      foreign branches of such banks), and U.S. and foreign
                      branches of foreign banks, provided that such institutions
                      (or, in the case of a branch, the parent institution) have
                      total assets of $1 billion or more as shown on their last
                      published financial statements at the time of investment;
                      (iii) short-term corporate obligations rated within the
                      three highest rating categories by a NRSRO (e.g., at least
                      A by S&P or A by Moody's) at the time of investment, or,
                      if not rated, determined by the Advisor to be of
                      comparable quality; (iv) general obligations issued by the
                      U.S. Government and backed by its full faith and credit,
                      and obligations issued or guaranteed as to principal and
                      interest by agencies or instrumentalities of the U.S.
                      Government (e.g., obligations issued by Farmers Home
                      Administration, Government National Mortgage Association,
                      Federal Farm Credit Bank and Federal Housing
                      Administration); (v) receipts, including TRs, TIGRs and
                      CATS; (vi) repurchase agreements involving such
                      obligations; (vii) loan participations issued by a bank in
                      the United States with assets exceeding $1 billion and for
                      which the underlying loan is issued by borrowers in whose
                      obligations the Fund may invest; (viii) money market funds
                      and (ix) foreign commercial paper.
 
                        Certain of the obligations in which a Fund may invest
                      may be variable or floating rate instruments, may involve
                      conditional or unconditional demand features and may
                      include variable amount master demand notes.
 
                        MORTGAGE-BACKED SECURITIES--Securities generally issued
                      or guaranteed by U.S. government agencies such as GNMA,
                      FNMA, or FHLMC. GNMA mortgage-backed certificates are
                      mortgage-backed securities of the modified pass-through
                      type, which means that both interest and principal
                      payments (including prepayments) are passed through
                      monthly to the holder of the certificate. Each GNMA
                      certificate evidences an interest in a specific pool of
 
                                       29
<PAGE>   30
 
                      mortgage loans insured by the Federal Housing
                      Administration or the Farmers Home Administration or
                      guaranteed by the Veterans Administration. FNMA, a
                      federally-chartered and stockholder-owned corporation,
                      issues pass-through certificates which are guaranteed as
                      to payment of principal and interest by FNMA. FHLMC, a
                      corporate instrumentality of the United States, issues
                      participation certificates which represent an interest in
                      mortgages held in FHLMC's portfolio. FHLMC guarantees the
                      timely payment of interest and the ultimate collection of
                      principal. Securities issued or guaranteed by FNMA and
                      FHLMC are not backed by the full faith and credit of the
                      United States. There can be no assurance that the U.S.
                      government would provide financial support to FNMA or
                      FHLMC if necessary in the future.
 
                        Although payments on certain mortgage-related securities
                      may be guaranteed by a third party or otherwise similarly
                      secured, the market value of such securities is not
                      secured and may fluctuate significantly because of changes
                      in interest rates and changes in prepayment levels. Thus,
                      for example, if a Fund purchases a mortgage-related
                      security at a premium, that portion may be lost if there
                      is a decline in the market value of the security whether
                      due to changes in interest rates or prepayments of the
                      underlying mortgage collateral. As with other
                      interest-bearing securities, the prices of
                      mortgage-related securities are inversely affected by
                      changes in interest rates. However, although the value of
                      a mortgage-related security may decline when interest
                      rates rise, the converse is not necessarily true because
                      in periods of declining interest rates the mortgages
                      underlying the securities are prone to prepayment which
                      results in amounts being available for reinvestment which
                      are likely to be invested at a lower interest rate. For
                      this and other reasons, the stated maturity of a
                      mortgage-related security may be shortened by unscheduled
                      prepayments on the underlying mortgages and, accordingly,
                      it is not possible to predict accurately the security's
                      return to a Fund. In addition, regular payments received
                      on mortgage-related securities include both interest and
                      principal. No assurance can be given as to the return a
                      Fund will receive when these amounts are reinvested. As a
                      consequence, mortgage-related securities may be a less
                      effective means of "locking in" interest rates than other
                      types of debt securities having the same stated maturity,
                      may have less potential for capital appreciation and may
                      be considered riskier investments as a result.
 
                        Adjustable rate mortgage securities ("ARMS") are
                      pass-through certificates representing ownership interests
                      in a pool of adjustable rate mortgages and the resulting
                      cash flow from those mortgages. Unlike conventional debt
                      securities, which provide for periodic (usually
                      semi-annual) payments of interest and payments of
                      principal at maturity or on specified call dates, ARMs
                      provide for monthly payments based on a pro rata share of
                      both periodic interest and principal payments and
                      prepayments of principal on the underlying mortgage pool
 
                                       30
<PAGE>   31
 
                      (less GNMA's, FNMA's, or FHLMC's fees and any applicable
                      loan servicing fees).
 
                        Collateralized mortgage obligations ("CMOs") are bonds
                      generally issued by single purpose, stand-alone finance
                      subsidiaries or trusts established by financial
                      institutions, government agencies, investment banks, or
                      other similar institutions, and collateralized by pools of
                      mortgage loans. Payments of principal and interest on the
                      collateral mortgages are used to pay debt service on the
                      CMO. In a CMO, a series of bonds or certificates is issued
                      in multiple classes. Each class of CMOs, often referred to
                      as a "tranche," is issued at a specific coupon rate and
                      has a stated maturity or final distribution date. The
                      principal and interest payment on the underlying mortgages
                      may be allocated among the classes of CMOs in several
                      ways. Typically, payments of principal, including any
                      prepayments, on the underlying mortgages would be applied
                      to the classes in the order of their respective stated
                      maturities or final distribution dates, so that no payment
                      of principal will be made on CMOs of a class until all
                      CMOs of other classes having earlier stated maturities or
                      final distribution dates have been paid in full.
 
                        One or more classes of CMOs may have coupon rates that
                      reset periodically based on an index, such as the London
                      Interbank Offered Rate ("LIBOR"). Each Fund may purchase
                      fixed, adjustable, or "floating" rate CMOs that are
                      collateralized by fixed rate or adjustable rate mortgages
                      that are guaranteed as to payment of principal and
                      interest by an agency or instrumentality of the U.S.
                      government or are directly guaranteed as to payment of
                      principal and interest by the issuer, which guarantee is
                      collateralized by U.S. government securities or is
                      collateralized by privately issued fixed rate or
                      adjustable rate mortgages.
 
                        Securities such as zero-coupon obligations,
                      mortgage-backed and asset-backed securities, and
                      collateralized mortgage obligations ("CMOs") will have
                      greater price volatility then other fixed-income
                      obligations. Because declining interest rates may lead to
                      prepayment of underlying mortgages, automobile sales
                      contracts or credit card receivables, the prices of
                      mortgage-related and asset-backed securities may not rise
                      with a decline in interest rates. Mortgage-backed and
                      asset-backed securities and CMOs are extremely sensitive
                      to the rate of principal prepayment. Similarly, callable
                      corporate bonds also present risk of prepayment.
 
                        During periods of falling interest rates, securities
                      that can be called or prepaid may decline in value
                      relative to similar securities that are not subject to
                      call or prepayment.
 
                        Real Estate Mortgage Investment Conduits ("REMICs") are
                      private entities formed for the purpose of holding a fixed
                      pool of mortgages secured by an interest in real property.
                      REMICs are similar to CMOs in that they issue multiple
                      classes of securities.
 
                                       31
<PAGE>   32
 
                        OPTIONS--Under a call option, the purchaser of the
                      option has the right to purchase, and the writer (the
                      Fund) the obligation to sell, the underlying security at
                      the exercise price during the option period. A put option
                      gives the purchaser the right to sell, and the writer the
                      obligation to purchase, the underlying security at the
                      exercise price during the option period.
 
                        In addition, certain Funds may buy options on stock
                      indices to invest cash on an interim basis. Such options
                      will be listed on a national securities exchange. In order
                      to close out an option position, a Fund may enter into a
                      "closing purchase transaction" -- the purchase of an
                      option on the same security with the same exercise price
                      and expiration date as the option contract previously
                      written on any particular security. When the security is
                      sold, a Fund effects a closing purchase transaction so as
                      to close out any existing option on that security.
 
                        There are risks associated with such investments
                      including the following: (1) the success of a hedging
                      strategy may depend on the ability of the Advisor or
                      Sub-Advisor to predict movements in the prices of
                      individual securities, fluctuations in markets and
                      movements in interest rates; (2) there may be an imperfect
                      correlation between the movement in prices of securities
                      held by a Fund and the price of options; (3) there may not
                      be a liquid secondary market for options; and (4) while a
                      Fund will receive a premium when it writes covered call
                      options, it may not participate fully in a rise in the
                      market value of the underlying security.
 
                        RECEIPTS--Interests in separately traded interest and
                      principal component parts of U.S. Treasury obligations
                      that are issued by banks and brokerage firms and are
                      created by depositing Treasury notes and Treasury bonds
                      into a special account at a custodian bank. The custodian
                      holds the interest and principal payments for the benefit
                      of the registered owners of the certificates of such
                      receipts. The custodian arranges for the issuance of the
                      certificates or receipts evidencing ownership and
                      maintains the register. Receipts include "Treasury
                      Receipts" ("TR's"), "Treasury Investment Growth Receipts"
                      ("TIGR's"), and "Certificates of Accrual on Treasury
                      Securities" ("CATS"). TR's, TIGR's and CATS are sold as
                      zero coupon securities, which means that they are sold at
                      a substantial discount and redeemed at face value at their
                      maturity date without interim cash payments of interest or
                      principal. This discount is accreted over the life of the
                      security, and such accretion will constitute the income
                      earned on the security for both accounting and tax
                      purposes. Because of these features, such securities may
                      be subject to greater interest rate volatility than
                      interest-paying securities. See also "FEDERAL TAXATION."
 
                        REPURCHASE AGREEMENTS--Agreements whereby a Fund will
                      acquire securities from approved financial institutions or
                      registered broker-dealers that agree to repurchase the
                      securities at a mutually agreed-upon date and price. The
                      repurchase agreements entered into by the Funds will
                      provide that the underlying
 
                                       32
<PAGE>   33
 
                      security at all times shall have a value equal to 102% of
                      the resale price stated in the agreement. Repurchase
                      agreements involving government securities are not subject
                      to a Fund's fundamental investment limitation on
                      purchasing securities of any one issuer. If the seller
                      defaults on its repurchase obligation or becomes
                      insolvent, the Fund holding such obligations would suffer
                      a loss to the extent that either the proceeds from a sale
                      of the underlying portfolio securities were less than the
                      repurchase price or the Fund's disposition of the
                      securities was delayed pending court action. Securities
                      subject to repurchase agreements will be held by a
                      qualified custodian or in the Federal Reserve/Treasury
                      book-entry system. Repurchase agreements are considered to
                      be loans by a Fund under the Investment Company Act of
                      1940 (the "1940 Act").
 
                        REVERSE REPURCHASE AGREEMENTS--A Fund may borrow funds
                      for temporary purposes by entering into reverse repurchase
                      agreements, provided such action is consistent with the
                      Fund's investment objective and fundamental investment
                      restrictions; as a matter of non-fundamental policy, each
                      Fund intends to limit such investments to no more than 10%
                      of the value of its total assets. Pursuant to a reverse
                      repurchase agreement, a Fund will sell portfolio
                      securities to financial institutions such as banks or to
                      broker-dealers, and agree to repurchase the securities at
                      a mutually agreed-upon date and price. A Fund intends to
                      enter into reverse repurchase agreements only to avoid
                      otherwise selling securities during unfavorable market
                      conditions to meet redemptions. At the time a Fund enters
                      into a reverse repurchase agreement, it will place in a
                      segregated custodial account assets such as U.S.
                      Government securities or other liquid, high-quality debt
                      securities consistent with the Fund's investment objective
                      having a value equal to 102% of the repurchase price
                      (including accrued interest), and will subsequently
                      monitor the account to ensure that an equivalent value is
                      maintained. Reverse repurchase agreements involve the risk
                      that the market value of the securities sold by a Fund may
                      decline below the price at which a Fund is obligated to
                      repurchase the securities. Reverse repurchase agreements
                      are considered to be borrowings by a Fund under the 1940
                      Act.
 
                        RULE 144A SECURITIES--Rule 144A Securities are
                      securities that have not been registered under the
                      Securities Act of 1933, but which may be traded between
                      certain qualified institutional investors, including
                      investment companies. The absence of a secondary market
                      may affect the value of the Rule 144A Securities. The
                      Board of Trustees of the Group has established guidelines
                      and procedures to be utilized to determine the liquidity
                      of such securities.
 
                        SECURITIES ISSUED ON A FORWARD COMMITMENT BASIS OR
                      WHEN-ISSUED SECURITIES--Securities purchased for delivery
                      beyond the normal settlement date at a stated price and
                      yield and which thereby involve a risk that the yield
                      obtained in the transaction will be less than that
                      available in the
 
                                       33
<PAGE>   34
 
                      market when delivery takes place. When a Fund agrees to
                      purchase when-issued securities or enter into forward
                      commitments, the Group's custodian will be instructed to
                      set aside cash or liquid portfolio securities equal to the
                      amount of the commitment in a segregated account. A Fund
                      will generally not pay for such securities and no income
                      will accrue on the securities until they are received.
                      These securities are recorded as an asset and are subject
                      to changes in value based upon changes in the general
                      level of interest rates. Therefore, the purchase of
                      securities on a "when-issued" basis or forward commitments
                      may increase the risk of fluctuations in a Fund's net
                      asset value.
 
                        SECURITIES LENDING--During the time portfolio securities
                      are on loan from a Fund, the borrower will pay the Fund
                      any dividends or interest paid on the securities. In
                      addition, loans will be subject to termination by the Fund
                      or the borrower at any time and, while a Fund will
                      generally not have the right to vote securities on loan,
                      it will terminate the loan and regain the right to vote if
                      that is considered important with respect to the
                      investment. While the lending of securities may subject a
                      Fund to certain risks, such as delays or an inability to
                      regain the securities in the event the borrower were to
                      default on its lending agreement or enter into bankruptcy,
                      a Fund will receive 100% collateral in the form of cash or
                      U.S. Government securities. This collateral will be valued
                      daily by the lending agent, with oversight by the Advisor,
                      and, should the market value of the loaned securities
                      increase, the borrower will be required to furnish
                      additional collateral to the Fund.
 
                        SECURITIES SUBJECT TO A PUT FEATURE--A "put" feature
                      permits a Fund to sell a fixed income security at a fixed
                      price prior to maturity. The underlying fixed income
                      securities subject to a put may be sold at any time at the
                      market rates. However, unless the put was an integral part
                      of the fixed income security as originally issued, it may
                      not be marketable or assignable. Generally, a premium is
                      paid for a put feature or a put feature is purchased
                      separately which results in a lower yield than would
                      otherwise be available for the same fixed income
                      securities.
 
                        TIME DEPOSITS--Non-negotiable receipts issued by U.S. or
                      foreign banks in exchange for the deposit of funds. Like
                      certificates of deposit, they earn a specified rate of
                      interest over a definite period of time; however, they
                      cannot be traded in the secondary market. Time deposits
                      with a withdrawal penalty are considered to be illiquid
                      securities.
 
                        U.S. GOVERNMENT AGENCY SECURITIES--Certain Federal
                      agencies have been established as instrumentalities of the
                      U.S. Government to supervise and finance certain types of
                      activities. Issues of these agencies, while not direct
                      obligations of the U.S. Government, are either backed by
                      the full faith and credit of the United States (e.g., GNMA
                      securities) or supported by the issuing
 
                                       34
<PAGE>   35
 
                      agencies' right to borrow from the U.S. Treasury. The
                      issues of other agencies are supported only by the credit
                      of the instrumentality (e.g., FNMA securities).
 
                        U.S. TREASURY OBLIGATIONS--Bills, notes, and bonds
                      issued by the U.S. Treasury, as well as separately traded
                      interest and principal component parts of such obligations
                      known as Separately Traded Registered Interest and
                      Principal Securities ("STRIPS") that are transferable
                      through the Federal book-entry system.
 
                        U.S. Government Securities generally do not involve the
                      credit risks associated with investments in other types of
                      fixed-income securities, although, as a result, the yields
                      available from U.S. Government Securities are generally
                      lower than the yields available from otherwise comparable
                      corporate fixed-income securities. Like other fixed-income
                      securities, however, the values of U.S. Government
                      Securities change as interest rates fluctuate.
                      Fluctuations in the value of portfolio securities will in
                      many cases not affect interest income on existing
                      portfolio securities, but will be reflected in the Fund's
                      net asset value. Because the magnitude of these
                      fluctuations will generally be greater at times when a
                      Fund's average maturity is longer, under certain market
                      conditions the Fund may invest in short-term investments
                      yielding lower current income rather than investing in
                      higher yielding longer-term securities.
 
                        VARIABLE AND FLOATING RATE INSTRUMENTS--Obligations that
                      may carry variable or floating rates of interest, may
                      involve conditional or unconditional demand features and
                      may include variable amount master demand notes. The
                      interest rates on these securities may be reset daily,
                      weekly, quarterly or some other reset period, and may have
                      a floor or ceiling on interest rate changes. There is a
                      risk that the current interest rate on such obligations
                      may not accurately reflect existing market interest rates.
                      A demand instrument with a demand notice period exceeding
                      seven days may be considered illiquid if there is no
                      secondary market for such security.
 
                        WARRANTS--Securities that entitle the holder to buy a
                      proportionate amount of common stock at a specified price
                      for a limited or unlimited period of time. Warrants are
                      often freely transferable and are traded on major stock
                      exchanges.
 
                        YANKEE BONDS--Dollar denominated securities issued by
                      foreign-domiciled issuers that obligate the issuer to pay
                      the bondholder a specified sum of money, usually
                      semiannually, and to repay the principal amount of the
                      loan at maturity. Sovereign bonds are bonds issued by the
                      governments of foreign countries. Supranational bonds are
                      those issued by supranational entities, such as the World
                      Bank and European Investment Bank. Canadian bonds are
                      bonds issued by Canadian provinces.
 
                                       35
<PAGE>   36
 
                        ZERO-COUPON OBLIGATIONS--Non-income producing securities
                      evidencing ownership of future interest and principal
                      payments on bonds. These obligations pay no current
                      interest and are typically sold at prices greatly
                      discounted from par value. The return on a zero-coupon
                      obligation, when held to maturity, equals the difference
                      between the par value and the original purchase price.
 
                        For federal income tax purposes, the difference between
                      the par value and the original issue price (original issue
                      discount) is included in the income of a holder of a
                      zero-coupon obligation over the term of the obligation
                      even though the interest is not paid until maturity. The
                      amount included in income is determined under a constant
                      interest rate method. In addition, if an obligation is
                      purchased subsequent to its original issue, a holder such
                      as the Income Funds may elect to include market discount
                      in income currently on a ratable accrual method or a
                      constant interest rate method. Market discount is the
                      difference between the obligation's "adjusted issue price"
                      (the original issue price plus original issue discount
                      accrued to date) and the holder's purchase price. If no
                      such election is made, gain on the disposition of a market
                      discount obligation is treated as ordinary income (rather
                      than capital gain) to the extent it does not exceed the
                      accrued market discount.
 
                        Zero-coupon obligations have greater price volatility
                      than other fixed-income obligations of similar maturity
                      and such obligations will be purchased when the yield
                      spread, in light of the obligation's duration, is
                      considered advantageous.
 
                                       36
<PAGE>   37
 
                          HighMark FIXED INCOME FUNDS
                            INVESTMENT PORTFOLIOS OF
                                 HighMark FUNDS
                   For further information (including current
                  yield, purchase and redemption information),
                              call 1-800-433-6884
 
INVESTMENT ADVISOR
Pacific Alliance Capital Management,
a division of Union Bank of California, N.A.
475 Sansome Street
Post Office Box 45000
San Francisco, CA 94104
 
SUB-ADVISOR
Bank of Tokyo-Mitsubishi Trust Company
1251 Avenue of the Americas
New York, New York 10116
 
CUSTODIAN
Union Bank of California, N.A.
475 Sansome Street
Post Office Box 45000
San Francisco, CA 94104
 
ADMINISTRATOR & DISTRIBUTOR
SEI Fund Resources and
SEI Financial Services Company
Oaks, Pennsylvania 19456
 
LEGAL COUNSEL
Ropes & Gray
One Franklin Square
1301 K Street, N.W., Suite 800 East
Washington, D.C. 20005
 
AUDITORS
Deloitte & Touche LLP
1700 Courthouse Plaza Northeast
Dayton, OH 45402
<PAGE>   38
 
  NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS IN CONNECTION WITH THE OFFERING
MADE BY THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY HIGHMARK OR
ITS DISTRIBUTOR. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY HIGHMARK OR
BY THE DISTRIBUTOR IN ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY
BE MADE.
 
NOT FDIC INSURED
<PAGE>   39
 
                                [HIGHMARK LOGO]
 
                                 HIGHMARK FUNDS
 
                               TRS-17236(R12/95)
<PAGE>   40
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR
     MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT
     BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR
     THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE
     UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS
     OF ANY SUCH STATE.
 
                             SUBJECT TO COMPLETION
 
                                 HIGHMARK FUNDS
 
                                  EQUITY FUNDS
 
  HighMark Funds ("HighMark") is an open-end, diversified, registered investment
company that offers a convenient means of investing in one or more
professionally managed portfolios of securities. This Prospectus relates to
HighMark's:
                                 - Income Equity Fund
                                 - Value Momentum Fund
                                 - Blue Chip Growth Fund
                                 - Growth Fund
                                 - Emerging Growth Fund
 
                                FIDUCIARY SHARES
 
  HighMark's Fiduciary Shares are offered to the following investors: (i)
fiduciary, advisory, agency, custodial and other similar accounts maintained
with Union Bank of California, N.A. or its affiliates; (ii) Select IRA accounts
established with The Bank of California, N.A. and invested in any of HighMark's
Equity or Income Funds prior to June 20, 1994, which have remained continuously
open thereafter and which are not considered to be fiduciary accounts; (iii)
Shareholders who currently own Shares of HighMark's Equity or Income Funds that
were purchased prior to June 20, 1994 within an account registered in their name
with the Funds; and (iv) present and retired directors, officers and employees
(and their spouses and children under the age of 21) of Union Bank of
California, N.A., HighMark's current or former distributors or their respective
affiliated companies who currently own Shares of HighMark Funds which were
purchased before April 30, 1997.
 
  This Prospectus sets forth concisely the information about HighMark and the
Funds that a prospective investor should know before investing. Investors are
advised to read this Prospectus and retain it for future reference. A Statement
of Additional Information dated the same date as this Prospectus has been filed
with the Securities and Exchange Commission and is available without charge by
writing the Distributor, SEI Financial Services Company, Oaks, Pennsylvania
19456, or by calling 1-800-433-6884. The Statement of Additional Information is
incorporated into this Prospectus by reference. This Prospectus relates only to
the Fiduciary Shares of the Equity Funds. Interested persons who wish to obtain
a prospectus for the other Funds of HighMark may contact the Distributor at the
above address and telephone number.
 
  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 COM MISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
HIGHMARK'S SHARES ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK, INCLUDING UNION BANK OF CALIFORNIA, N.A., BANK OF
TOKYO-MITSUBISHI, LIMITED OR ANY OF THEIR AFFILIATES OR CORRESPONDENTS. HIGHMARK
ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY
OTHER GOVERNMENT AGENCY. INVESTMENT IN HIGHMARK INVOLVES RISKS, INCLUDING
POSSIBLE LOSS OF THE PRINCIPAL AMOUNT INVESTED.
 
February 26, 1997
Fiduciary Shares
<PAGE>   41
 
                                    SUMMARY
 
HIGHMARK FUNDS ("HighMark") is an open-end, diversified, registered investment
company providing a convenient way to invest in professionally managed
portfolios of securities. The following provides basic information about the
Fiduciary Shares of the Income Equity, Value Momentum, Blue Chip Growth, Growth,
and Emerging Growth Funds (each a "Fund" and sometimes referred to in this
prospectus as the "Equity Funds.") This summary is qualified in its entirety by
reference to the more detailed information provided elsewhere in the Prospectus
and in the Statement of Additional Information.
 
WHAT ARE THE FUNDS' INVESTMENT OBJECTIVES? THE INCOME EQUITY FUND seeks
investments in equity securities that provide current income through the regular
payment of dividends, with the goal that the Fund will have a high current yield
and a low level of price volatility; opportunity for long-term growth of asset
value is a secondary consideration. THE VALUE MOMENTUM FUND seeks long-term
capital growth with a secondary objective of income. THE BLUE CHIP GROWTH FUND
seeks long-term capital growth by investing in a diversified portfolio of common
stocks and other equity securities of seasoned, large capitalization companies.
THE GROWTH FUND seeks long-term capital appreciation through investments in
equity securities; the production of current income is an incidental objective.
THE EMERGING GROWTH FUND seeks long-term growth of capital by investing in a
diversified portfolio of equity securities of small capitalization, emerging
growth companies. (See "INVESTMENT OBJECTIVES.")
 
WHAT ARE THE FUNDS' PERMITTED INVESTMENTS? Each of the Funds primarily invests,
consistent with its investment objective, in equity securities including common
stocks and securities convertible into common stocks. Each Fund may also invest
consistent with its investment objective and investment policies in certain
other instruments. (See "INVESTMENT POLICIES.")
 
WHAT ARE THE RISKS INVOLVED WITH AN INVESTMENT IN THE FUNDS? The investment
policies of each Fund entail certain risks and considerations of which an
investor should be aware. Each of the Funds may purchase common stocks and other
equity securities that are volatile and which may fluctuate in value more than
other types of investments. Values of fixed income securities and,
correspondingly, share prices of Funds invested in such securities, tend to vary
inversely with interest rates, and may be affected by other market and economic
factors as well. In addition, the securities of the emerging growth companies in
which the Emerging Growth Fund may invest may be less liquid, and subject to
more abrupt or erratic market movements, than securities of larger, more
established growth companies. (See "Risk Factors.")
 
ARE MY INVESTMENTS INSURED? HighMark's Shares are not federally insured by the
FDIC or any other government agency. Any guarantee by the U.S. Government, its
agencies or any instrumentalities of the securities in which any Fund invests
guarantees only the payment of principal and interest on the guaranteed
security, and does not guarantee the total return or value of the security or
total return or value of Shares of that Fund.
 
WHO IS THE ADVISOR? Pacific Alliance Capital Management, a division of Union
Bank of California, N.A., serves as the Advisor to HighMark. (See "The
Advisor.")
 
WHO IS THE SUB-ADVISOR? Bank of Tokyo-Mitsubishi Trust Company serves as the
Sub-Advisor to the Emerging Growth and Blue Chip Growth Funds. (See "The
Sub-Advisor.")
 
                                        2
<PAGE>   42
 
WHO IS THE ADMINISTRATOR? SEI Fund Resources serves as the Administrator of
HighMark. (See "The Administrator.")
 
WHO IS THE CUSTODIAN? Union Bank of California, N.A. (the "Bank") serves as the
custodian of HighMark's assets. (See "The Custodian.")
 
WHO IS THE DISTRIBUTOR? SEI Financial Services Company acts as distributor of
HighMark's Shares. (See "The Distributor.")
 
HOW DO I PURCHASE AND REDEEM SHARES? Purchases and redemptions may be made
through the Distributor on days on which both the New York Stock Exchange and
the Federal Reserve wire system are open for business ("Business Days"). The
minimum initial investment is generally $1,000. A purchase order will be
effective if the Distributor receives an order prior to 1:00 p.m., Pacific time
(4:00 p.m., Eastern time). Purchase orders for Shares will be executed at a per
Share price equal to the asset value next determined after the purchase order is
effective. Redemption orders must be placed prior to 1:00 p.m., Pacific time
(4:00 p.m., Eastern time) on any Business Day for the order to be effective that
day. (See "PURCHASE AND REDEMPTION OF SHARES.")
 
HOW ARE DIVIDENDS PAID? Substantially all of the net investment income
(exclusive of capital gains) of the Funds is distributed in the form of monthly
dividends to Shareholders of record. Any capital gain is distributed at least
annually. Distributions are paid in additional Shares unless the Shareholder
elects to take the payment in cash. ( See "DIVIDENDS.")
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
Summary...............................................................................    2
Equity Funds Fee Table................................................................    5
Financial Highlights..................................................................    7
Fund Description......................................................................   12
Investment Objectives.................................................................   12
Investment Policies...................................................................   13
  Income Equity Fund..................................................................   13
  Value Momentum Fund.................................................................   13
  Blue Chip Growth Fund...............................................................   14
  Growth Fund.........................................................................   14
  Emerging Growth Fund................................................................   14
General...............................................................................   15
  Money Market Instruments............................................................   15
  Illiquid and Restricted Securities..................................................   15
  Lending of Portfolio Securities.....................................................   15
  Other Investments...................................................................   15
  Risk Factors........................................................................   17
Investment Limitations................................................................   18
  Portfolio Turnover..................................................................   19
Purchase and Redemption of Shares.....................................................   19
</TABLE>
 
                                        3
<PAGE>   43
 
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
Exchange Privileges...................................................................   20
Dividends.............................................................................   21
Federal Taxation......................................................................   22
Service Arrangements..................................................................   23
  The Advisor.........................................................................   23
  Sub-Advisor.........................................................................   24
  Administrator.......................................................................   25
  The Transfer Agent..................................................................   26
  Shareholder Service Plan............................................................   26
  Distributor.........................................................................   26
  Banking Laws........................................................................   27
  Custodian...........................................................................   27
General Information...................................................................   27
  Description of HighMark & Its Shares................................................   27
  Performance Information.............................................................   28
  Miscellaneous.......................................................................   29
Description of Permitted Investments..................................................   30
</TABLE>
 
                                        4
<PAGE>   44
 
                             EQUITY FUNDS FEE TABLE
 
<TABLE>
<CAPTION>
                                                                INCOME      VALUE     BLUE CHIP                EMERGING
                                                                EQUITY     MOMENTUM    GROWTH      GROWTH       GROWTH
                                                                 FUND        FUND       FUND        FUND         FUND
                                                               FIDUCIARY   FIDUCIARY  FIDUCIARY   FIDUCIARY   FIDUCIARY
                                                                SHARES      SHARES     SHARES      SHARES       SHARES
                                                               ---------   --------   ---------   ---------   ----------
<S>                                                            <C>         <C>        <C>         <C>         <C>
SHAREHOLDER TRANSACTION EXPENSES(A)
  Maximum Sales Load Imposed on Purchases (as a percentage of
    offering price)..........................................        0%         0%          0%          0%          0%
  Maximum Sales Load Imposed on Reinvested Dividends (as a
    percentage of offering price)............................        0%         0%          0%          0%          0%
  Deferred Sales Load (as a percentage of original purchase
    price or redemption proceeds, as applicable).............        0%         0%          0%          0%          0%
  Redemption Fees (as a percentage of amount redeemed, if
    applicable)(b)...........................................        0%         0%          0%          0%          0%
  Exchange Fee(a)............................................    $   0       $  0       $   0       $   0        $  0
ANNUAL OPERATING EXPENSES (as a percentage of net assets)
  Management Fees............................................     0.60%      0.60%       0.60%       0.60%       0.80%
  12b-1 Fees.................................................        0%         0%          0%          0%          0%
  Other Expenses (after voluntary reduction)(c)..............     0.31%      0.21%       0.22%       0.30%       0.23%
  Total Fund Operating Expenses(d)...........................     0.91%      0.81%       0.82%       0.90%       1.03%
                                                                  ====       ====        ====        ====        ====
</TABLE>
 
  EXAMPLE: You would pay the following expenses on a $1,000 investment, assuming
(1) 5% annual return and (2) redemption at the end of each time period.
 
<TABLE>
<CAPTION>
                                                                         3        5        10
                                                              1 YEAR   YEARS    YEARS     YEARS
                                                              ------   ------   ------   -------
<S>                                                           <C>      <C>      <C>      <C>
Income Equity Fund Fiduciary Shares.........................   $  9     $ 29     $ 50     $ 112
Value Momentum Fund Fiduciary Shares........................   $  8     $ 26     $ 45     $ 100
Blue Chip Growth Fund Fiduciary Shares......................   $  8     $ 26     $ 46     $ 101
Growth Fund Fiduciary Shares................................   $  9     $ 29     $ 50     $ 111
Emerging Growth Fund Fiduciary Shares.......................   $ 11     $ 33     $ 57     $ 126
</TABLE>
 
  The purpose of the tables above is to assist an investor in the Equity Funds
in understanding the various costs and expenses that a Shareholder will bear
directly or indirectly. For a more complete discussion of each Fund's annual
operating expenses, see SERVICE ARRANGEMENTS below. THE FOREGOING EXAMPLE SHOULD
NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE EXPENSES. ACTUAL EXPENSES
MAY BE GREATER OR LESS THAN THOSE SHOWN.
- ---------------
 
(a) Certain entities (including Union Bank of California and its affiliates)
    making investments in the Equity Funds on behalf of their customers may
    charge customers fees for services provided in connection with the
    investment in, redemption of, and exchange of Shares. (See PURCHASE AND
    REDEMPTION OF SHARES, EXCHANGE PRIVILEGES, and SERVICE ARRANGEMENTS--below.)
 
(b) A wire redemption charge is deducted from the amount of a wire redemption
    payment made at the request of a Shareholder. (See REDEMPTION OF SHARES
    below.)
 
                                        5
<PAGE>   45
 
(c) OTHER EXPENSES for the Value Momentum, Emerging Growth and Blue Chip Growth
    Funds are based on each Fund's estimated expenses for the current fiscal
    year. Absent voluntary fee waivers, OTHER EXPENSES would be 0.48% for the
    Fiduciary Shares of the Income Equity, Value Momentum and Growth Funds,
    0.49% for the Fiduciary Shares of the Blue Chip Growth Fund and 0.50% for
    the Fiduciary Shares of the Emerging Growth Fund.
 
(d) Absent voluntary fee waivers, TOTAL FUND OPERATING EXPENSES would be: 1.08%
    for the Fiduciary Shares of the Income Equity, Value Momentum and Growth
    Funds, 1.09% for the Fiduciary Shares of the Blue Chip Growth Fund, and
    1.30% for the Fiduciary Shares of the Emerging Growth Fund.
 
                                        6
<PAGE>   46
 
                              FINANCIAL HIGHLIGHTS
 
  The tables below set forth certain financial information with respect to the
Fiduciary Shares of the Income Equity Fund and the Growth Fund. Financial
highlights for the Income Equity Fund and the Growth Fund for the period ended
July 31, 1996 have been derived from financial statements audited by Deloitte &
Touche LLP, independent auditors for HighMark, whose report thereon is included
in the Statement of Additional Information. Prior to the fiscal year ended July
31, 1996, Coopers & Lybrand L.L.P. served as independent accountants for
HighMark. Financial highlights for the Income Equity Fund for the periods
indicated have been derived from financial statements audited by Coopers &
Lybrand L.L.P. Financial highlights for the Income Equity Fund for the years
ended December 31, 1987, 1986, 1985, and for the period ended December 31, 1984
have been derived from financial statements examined by other auditors whose
report thereon is on file with the Securities and Exchange Commission. Financial
highlights for the Income Equity Fund for the period from January 1, 1988
through June 22, 1988 are derived from unaudited financial statements prepared
by HighMark.
 
  The Value Momentum Fund, the Blue Chip Growth Fund and the Emerging Growth
Fund had not commenced operations in HighMark as of July 31, 1996.
 
  Prior to June 20, 1994, the Income Equity Fund and the Growth Fund offered a
single class of Shares (now designated Fiduciary Shares) throughout the periods
shown.
 
                                        7
<PAGE>   47
 
                               INCOME EQUITY FUND
 
<TABLE>
<CAPTION>
                                                            YEAR ENDED JULY 31,
                                     ------------------------------------------------------------------
                                       1996        1995       1994(A)
                                     ---------   ---------   ---------
                                     FIDUCIARY   FIDUCIARY   FIDUCIARY     1993       1992       1991
                                     ---------   ---------   ---------   --------   --------   --------
<S>                                  <C>         <C>         <C>         <C>        <C>        <C>
Net Asset Value, Beginning of
  Period...........................  $   13.00   $   11.92   $   12.13   $  11.42   $  10.22   $  10.46
                                      --------    --------    --------   --------   --------   --------
Investment Activities
  Net investment income............       0.42        0.44        0.39       0.38       0.40       0.46
  Net realized and unrealized gains
     (losses) on investments.......       1.93        1.50        0.12       0.71       1.20       0.61
                                      --------    --------    --------   --------   --------   --------
Total from Investment Activities...       2.35        1.94        0.51       1.09       1.60       1.07
                                      --------    --------    --------   --------   --------   --------
Distributions
  Net investment income............      (0.42)      (0.44)      (0.39)     (0.38)     (0.40)     (0.46)
  Net realized gains...............      (0.66)      (0.42)      (0.33)                           (0.85)
                                      --------    --------    --------   --------   --------   --------
Total Distributions................      (1.08)      (0.86)      (0.72)     (0.38)     (0.40)     (1.31)
                                      --------    --------    --------   --------   --------   --------
Net Asset Value, End of Period.....  $   14.27   $   13.00   $   11.92   $  12.13   $  11.42   $  10.22
                                      ========    ========    ========   ========   ========   ========
Total Return.......................      18.25%      17.26%       4.23%      9.75%     16.04%     12.60%
Ratios/Supplementary Data:
  Net Assets at end of period
     (000).........................  $ 262,660   $ 221,325   $ 213,328   $104,840   $ 74,478   $ 49,047
  Ratio of expenses to average net
     assets........................       1.03%       1.06%       1.06%      1.15%      1.16%      1.17%
  Ratio of net investment income to
     average net assets............       2.95%       3.59%       3.29%      3.27%      3.76%      4.81%
  Ratio of expenses to average net
     assets*.......................       1.27%       1.30%       1.10%      1.21%      1.29%      1.40%
  Ratio of net investment income to
     average net assets*...........       2.71%       3.34%       3.24%      3.22%      3.64%      4.58%
Portfolio turnover.................      41.51%      36.64%      33.82%     29.58%     23.05%     33.10%
</TABLE>
 
                                        8
<PAGE>   48
 
<TABLE>
<CAPTION>
                                                                                        JUNE 23,
                                                                                        1988 TO
                                                                YEAR ENDED JULY 31,     JULY 31,
                                                                -------------------     --------
                                                                 1990        1989       1988(C)
                                                                -------     -------     --------
<S>                                                             <C>         <C>         <C>
Net Asset Value, Beginning of Period..........................  $ 12.12     $ 10.00     $  10.00
                                                                -------     -------      -------
Investment Activities
  Net investment income.......................................     0.54        0.49         0.03
  Net realized and unrealized gains (losses) on investments...    (0.62)       2.22
                                                                -------     -------      -------
Total from investment Activities..............................    (0.08)       2.71         0.03
                                                                -------     -------      -------
Distributions
  Net Investment income.......................................    (0.54)      (0.49)       (0.03)
  Net realized gains..........................................    (1.04)      (0.10)
                                                                -------     -------      -------
Total Distributions...........................................    (1.58)      (0.59)       (0.03)
                                                                -------     -------      -------
Net Asset Value, End of Period................................  $ 10.46     $ 12.12     $  10.00
                                                                =======     =======      =======
Total Return..................................................    (0.84)%     28.16%        1.31%(d)
Ratios/Supplementary Data:
  Net Assets at end of period (000)...........................  $41,280     $40,027     $ 30,495
  Ratio of expenses to average net assets.....................     1.15%       1.19%        0.99%(b)
  Ratio of net investment income to average net assets........     4.82%       4.61%        2.56%(b)
  Ratio of expenses to average net assets*....................     1.41%       1.41%        1.41%(b)
  Ratio of net investment income to average net assets*.......     4.56%       4.39%        2.14%(b)
Portfolio turnover............................................    37.11%      28.83%        3.12%(b)
</TABLE>
 
- ---------------
(a) On June 20, 1994, the Income Equity Fund commenced offering Investor Shares
    (now called "Retail Shares") and designated existing Shares as Fiduciary
    Shares.

(b) Annualized.

(c) The Income Equity Fund commenced operations on June 23, 1988 as a result of
    the reorganization involving the Income Equity Portfolio of the IRA
    collective Investment Fund described under GENERAL
    INFORMATION--Reorganization of The IRA Fund & HighMark.

(d) Not annualized.
 
 *  During the period the investment advisory and administration fees were
    voluntarily reduced. If such voluntary fee reductions had not occurred, the
    ratios would have been as indicated.
 
                                        9
<PAGE>   49
 
                      PER SHARE INCOME AND CAPITAL CHANGES
                (FOR A SHARE OUTSTANDING THROUGHOUT THE PERIODS)
 
           THE IRA COLLECTIVE INVESTMENT FUND INCOME EQUITY PORTFOLIO
 
<TABLE>
<CAPTION>
                                                         PERIOD FROM
                                                           JAN. 1,
                                                            1988
                                                           THROUGH          YEAR ENDED DEC. 31,
                                                          JUNE 22,       -------------------------
                                                         1988(A)(B)       1987(A)        1986(A)
                                                         (UNAUDITED)     (AUDITED)      (AUDITED)
                                                         -----------     ----------     ----------
<S>                                                      <C>             <C>            <C>
Investment income......................................  $     0.440     $    0.927     $    0.944
Operating expenses.....................................        0.102          0.185(d)       0.154(d)
Net investment income..................................        0.338          0.742          0.790
Dividends from net investment income...................       (0.338)        (0.742)        (0.790)
Net realized and unrealized gain (loss) on
  investments..........................................        1.884         (0.564)         1.934
                                                          ----------     ----------     ----------
Increase (decrease) in net asset value.................        1.884         (0.564)         1.934
Net Asset Value:
  Beginning of period..................................       14.059         14.623         12.689
                                                          ----------     ----------     ----------
  End of period........................................  $    15.943     $   14.059     $   14.623
                                                          ==========     ==========     ==========
Ratio of expenses to average net assets(c)(d)..........         1.41%          1.12%          0.97%
Ratio of net investment income to average net
  assets(c)............................................         5.45%          4.50%          4.96%
Portfolio turnover.....................................         5.83%         20.88%         12.07%
Number of Shares/units outstanding at end of period....    1,940,573      1,978,920      1,416,327
</TABLE>
 
- ---------------
 
(a) The per share amount is calculated using weighted-average Shares
    outstanding.
(b) The Income Equity Fund commenced operations on June 23, 1988 as a result of
    the reorganization involving the Income Equity Portfolio of the IRA
    Collective Investment Fund.
(c) Annualized based on the period of which assets were held.
(d) The expenses shown are not representative of expenses actually incurred by
    the Income Equity Portfolio through May 31, 1987. During mid-May 1985, The
    Bank of California, N.A., investment adviser to the Income Equity Portfolio,
    commenced charging its management fee, and commencing June 1, 1987,
    operating expenses were charged to the Income Equity Portfolio. Had the
    maximum allowable operating expenses and management fees been paid by the
    Income Equity Portfolio for the entire period pursuant to the Management
    Agreement between the Income Equity Portfolio and The Bank of California,
    N.A., the per unit expenses and net investment income would have been as
    follows:
 
<TABLE>
<CAPTION>
                                                           PERIOD FROM
                                                             JAN. 1,
                                                              1988
                                                             THROUGH          YEAR ENDED DEC. 31,
                                                            JUNE 22,       -------------------------
                                                              1988            1987           1986
                                                           (UNAUDITED)     (AUDITED)      (AUDITED)
                                                           -----------     ----------     ----------
<S>                                                        <C>             <C>            <C>
Expenses.................................................    $ 0.257        $  0.260       $  0.248
Net investment income....................................      0.183           0.612          0.557
Net asset value, end of year.............................     15.943          14.059         14.623
Expenses as a percentage of average net assets...........      2.00%(c)         1.67%          2.00%
</TABLE>
 
                                       10
<PAGE>   50
 
                                  GROWTH FUND
 
<TABLE>
<CAPTION>
                                                                YEAR ENDED JULY 31,
                                                               ---------------------
                                                                                       NOV. 18, 1993 TO
                                                                 1996        1995      JULY 31, 1994(A)
                                                               ---------   ---------   ----------------
                                                               FIDUCIARY   FIDUCIARY      FIDUCIARY
                                                               ---------   ---------   ----------------
<S>                                                            <C>         <C>         <C>
Net Asset Value, Beginning of Period.........................   $  11.87    $   9.76       $  10.00
                                                                  ------      ------         ------
Investment Activities
Net investment income........................................       0.12        0.15           0.05
Net realized and unrealized gains (losses) on investments....       1.35        2.26          (0.24)
                                                                  ------      ------         ------
          Total from Investment Activities...................       1.47        2.41          (0.19)
                                                                  ------      ------         ------
Distributions
Net investment income........................................      (0.12)      (0.15)         (0.05)
Net realized gains...........................................      (0.64)      (0.15)            --
                                                                  ------      ------         ------
          Total Distributions................................      (0.76)      (0.30)         (0.05)
                                                                  ------      ------         ------
Net Asset Value, End of Period...............................   $  12.58    $  11.87       $   9.76
                                                                  ======      ======         ======
Total Return.................................................      12.72%      25.23%         (1.87)%(c)
Ratios/Supplementary Data:
  Net Assets at end of period (000)..........................   $ 41,495    $ 25,096       $ 15,254
  Ratio of expenses to average net assets....................       0.93%       0.79%          0.77%(b)
  Ratio of net investment income to average net assets.......       0.98%       1.40%          0.86%(b)
  Ratio of expenses to average net assets*...................       1.67%       1.92%          2.61%(b)
  Ratio of net investment income loss to average net
     assets*.................................................       0.23%       0.26%         (0.98)%(b)
Portfolio turnover...........................................      78.58%      67.91%        123.26%
</TABLE>
 
- ---------------
(a) Period from commencement of operations. On June 20, 1994, the Growth Fund
    commenced offering Investor Shares (now called "Retail Shares") and
    designated existing shares as Fiduciary Shares.

(b) Annualized.

(c) Not annualized.
 
 *  During the period, certain fees were voluntarily reduced. In addition,
    certain expenses were reimbursed. If such voluntary fee reductions and
    expense reimbursements had not occurred, the ratios would have been as
    indicated.
 
                                       11
<PAGE>   51
 
FUND
DESCRIPTION             HighMark Funds ("HighMark") is an open-end, diversified,
                      registered investment company that currently offers units
                      of beneficial interest ("Shares") in sixteen separate
                      investment portfolios ("Funds"). All of the Funds are
                      advised by Pacific Alliance Capital Management (the
                      "Advisor"), a division of Union Bank of California, N.A.
                      Shareholders may purchase Shares of selected Funds through
                      two separate classes (the "Retail" and "Fiduciary"
                      classes). These classes may have different sales charges
                      and other expenses, which may affect performance.
                      Information regarding HighMark's other Funds and other
                      classes is contained in separate prospectuses that may be
                      obtained from HighMark's Distributor, SEI Financial
                      Services Company, at Oaks, Pennsylvania 19456, or by
                      calling 1-800-433-6884.
 
                        For information concerning those investors who qualify
                      to purchase Fiduciary Shares, see PURCHASE AND REDEMPTION
                      OF SHARES below. (Fiduciary Shares may be hereinafter
                      referred to as "Shares.")
 
INVESTMENT
OBJECTIVES              The investment objectives of the Funds are as follows:
 
                        The Income Equity Fund seeks investments in equity
                      securities that provide current income through the regular
                      payment of dividends, with the goal that the Income Equity
                      Fund will have a high current yield and a low level of
                      price volatility. Opportunity for long-term growth of
                      asset value is a secondary consideration.
 
                        The Value Momentum Fund seeks long-term capital growth
                      with a secondary objective of income.
 
                        The Blue Chip Growth Fund seeks long-term capital growth
                      by investing in a diversified portfolio of common stocks
                      and other equity securities of seasoned, large
                      capitalization companies.
 
                        The Growth Fund seeks long-term capital appreciation
                      through investments in equity securities. The production
                      of current income is an incidental objective.
 
                        The Emerging Growth Fund seeks long-term growth of
                      capital by investing in a diversified portfolio of equity
                      securities of small capitalization, emerging growth
                      companies.
 
                        The investment objectives and certain of the investment
                      limitations of the Funds may not be changed without a vote
                      of the holders of a majority of the outstanding Shares of
                      the respective Fund (as defined under GENERAL
                      INFORMATION -- Miscellaneous below). There can be no
                      assurance that a Fund will achieve its investment
                      objective.
 
                                       12
<PAGE>   52
 
INVESTMENT
POLICIES              Income Equity Fund
 
                        Under normal market conditions, the Income Equity Fund
                      will invest at least 65% of its total assets in equity
                      securities, including common stocks, warrants to purchase
                      common stocks, American Depositary Receipts ("ADRs"),
                      preferred stocks and securities (including debt
                      securities) convertible into or exercisable for common
                      stocks. The Income Equity Fund's investments primarily
                      consist of the common stocks of U.S. corporations that
                      regularly pay dividends, although there can be no
                      assurance that a corporation will continue to pay
                      dividends. Investments will be made in an attempt to keep
                      the Income Equity Fund's yield above the S&P 500's yield
                      by approximately one-third to one-half the difference
                      between the S&P 500's yield and the yield on long-term
                      U.S. Government bonds.
 
                        The Income Equity Fund generally invests in stocks with
                      favorable, long-term fundamental characteristics when
                      their current relative yields are at the upper end of
                      their historical yield ranges. Frequently, these stocks
                      are out of favor in the financial community and investors
                      see little opportunity for price appreciation. The Fund
                      may also invest in major U.S. corporations in a mature
                      stage of development or operating in slower areas of the
                      economy. While it is anticipated that a significant part
                      of the total growth in asset value experienced by the
                      Income Equity Fund will result from companies' improving
                      prospects (although there can be no assurance that this
                      will in fact occur), dividends will provide a substantial
                      portion of the Fund's total return. When yields on stocks
                      held by the Income Equity Fund drop to the lower end of
                      their historical ranges, the Fund may begin to reduce its
                      holdings. Similarly, if there is a significant fundamental
                      change that impairs a company's ability to pay dividends,
                      or if the yield on a stock dips below the yield of the
                      general market, the Income Equity Fund may eliminate its
                      holdings in these stocks.
 
                      Value Momentum Fund
 
                        Under normal market conditions, the Value Momentum Fund
                      will invest at least 65% of its total assets in equity
                      securities, including common stocks, warrants to purchase
                      common stocks, ADRs, preferred stocks and securities
                      (including debt securities) convertible into or
                      exercisable for common stocks. The Value Momentum Fund
                      will be invested primarily in securities which the Advisor
                      believes to be undervalued relative to the market and to
                      the security's historic valuation. Stocks are then
                      screened for positive price or earnings momentum.
                      Securities purchased will generally have a medium to high
                      market capitalization. A majority of the securities in
                      which the Value Momentum Fund invests will be dividend
                      paying.
 
                                       13
<PAGE>   53
 
                      Blue Chip Growth Fund
 
                        Under normal market conditions, the Blue Chip Growth
                      Fund will invest at least 65% of its total assets in
                      equity securities, including common stocks, warrants to
                      purchase common stocks, ADRs, preferred stocks and
                      securities (including debt securities) convertible into or
                      exercisable for common stocks. The Fund primarily invests
                      in equity securities of seasoned, large capitalization
                      companies. A seasoned company is generally a company with
                      an operating history of 3 years or more. A large
                      capitalization company is generally a company with
                      capitalization in excess of $1.0 billion. A majority of
                      the Fund's equity investments ordinarily will consist of
                      dividend-paying securities.
 
                      Growth Fund
 
                        Under normal market conditions, the Growth Fund will
                      invest at least 65% of its total assets in equity
                      securities, including common stocks, warrants to purchase
                      common stocks, ADRs, preferred stocks and securities
                      (including debt securities) convertible into or
                      exercisable for common stocks, of growth-oriented
                      companies. The Growth Fund emphasizes a well-diversified
                      portfolio of medium to large capitalization growth
                      companies (capitalization in excess of $500 million) with
                      a record of above average growth in earnings. The Fund
                      focuses on companies that the Advisor believes to have
                      enduring quality and above average earnings growth. Among
                      the criteria the Fund uses to screen for stock selection
                      are earnings growth, return on capital, brand identity,
                      recurring revenues, price and quality of management team.
 
                      Emerging Growth Fund
 
                        Under normal market conditions, the Emerging Growth Fund
                      will invest at least 65% of its total assets in equity
                      securities, including common stocks, warrants to purchase
                      common stocks, ADRs, preferred stocks and securities
                      (including debt securities) convertible into or
                      exercisable for common stocks of small and medium
                      capitalization companies. Small and medium capitalization
                      companies are those with capitalization between $50
                      million and $1 billion and the potential for growth or
                      those which, in the Advisor's opinion, have potential for
                      above-average long-term capital appreciation. An emerging
                      growth company is one which, in the Advisor's judgment, is
                      in the developing stages of its life cycle and has
                      demonstrated or is expected to achieve rapid growth in
                      earnings and/or revenues. Emerging growth companies are
                      characterized by opportunities for rapid growth rates
                      and/or dynamic business changes. Emerging growth
                      companies, regardless of size, tend to offer the potential
                      for accelerated earnings or revenue growth because of new
                      products or technologies, new channels of distribution,
                      revitalized management or industry conditions, or similar
                      opportunities. A company may or may not yet be profitable
                      at the time the Emerging
 
                                       14
<PAGE>   54
 
                      Growth Fund invests in its securities. Current income will
                      not be a criterion of investment selection, and any such
                      income should be considered incidental. Many of the
                      securities in which the Fund invests will not pay
                      dividends.
 
                        The Emerging Growth Fund may also invest in equity
                      securities of companies in "special equity situations,"
                      meaning companies experiencing unusual and possibly
                      non-repetitive developments, such as mergers;
                      acquisitions; spin-offs; liquidations; reorganizations;
                      and new products, technology or management. Since a
                      special equity situation may involve a significant change
                      from a company's past experiences, the uncertainties in
                      the appraisal of the future value of the company's equity
                      securities and the risk of a possible decline in the value
                      of the Emerging Growth Fund's investments are significant.
 
GENERAL               Money Market Instruments
 
                        Under normal market conditions, each Equity Fund may
                      invest up to 35% of its total assets in money market
                      instruments. When market conditions indicate a temporary
                      "defensive" investment strategy as determined by the
                      Advisor, a Fund may invest more than 35% of its total
                      assets in money market instruments. A Fund will not be
                      pursuing its investment objective to the extent that a
                      substantial portion of its assets are invested in money
                      market instruments.
 
                      Illiquid and Restricted Securities
 
                        Each Fund shall limit investment in illiquid securities
                      to 15% or less of its net assets. Generally, an "illiquid
                      security" is any security that cannot be disposed of
                      promptly and in the ordinary course of business at
                      approximately the amount at which the Fund has valued the
                      instrument. The absence of a trading market can make it
                      difficult to ascertain the market value of the illiquid
                      securities. Each Fund may purchase restricted securities
                      which have not been registered under the Securities Act of
                      1933 (e.g., Rule 144A Securities and Section 4(2)
                      commercial paper) subject to policies approved by the
                      Board of Trustees. See INVESTMENT RESTRICTIONS in the
                      Statement of Additional Information.
 
                      Lending of Portfolio Securities
 
                        In order to generate additional income, a Fund may lend
                      its portfolio securities to broker-dealers, banks or other
                      institutions. A Fund may lend portfolio securities in an
                      amount representing up to 33 1/3% of the value of the
                      Fund's total assets.
 
                      Other Investments
 
                        The Funds may enter into repurchase agreements and
                      reverse repurchase agreements.
 
                                       15
<PAGE>   55
 
                        The Equity Funds may enter into forward commitments or
                      purchase securities on a "when-issued" basis. Each Equity
                      Fund expects that commitments by a Fund to enter into
                      forward commitments or purchase when-issued securities
                      will not exceed 25% of the value of the Fund's total
                      assets under normal market conditions. The Equity Funds do
                      not intend to purchase when-issued securities or forward
                      commitments for speculative or leveraging purposes but
                      only for the purpose of acquiring portfolio securities.
 
                        The Funds may also invest in money market instruments,
                      money market funds, and in cash, and may invest in other
                      registered investment companies with similar investment
                      objectives.
 
                        A Fund may invest up to 5% of its total assets in the
                      shares of any one registered investment company, but may
                      not own more than 3% of the securities of any one
                      registered investment company or invest more than 10% of
                      its assets in the securities of other registered
                      investment companies. In accordance with an exemptive
                      order issued to HighMark by the SEC, such other registered
                      investment company securities may include shares of a
                      money market fund of HighMark, and may include registered
                      investment companies for which the Advisor or Sub-Advisor
                      to a Fund of HighMark, or an affiliate of such Advisor or
                      Sub-Advisor, serves as investment advisor, administrator
                      or distributor. Because other registered investment
                      companies employ an investment advisor, such investment by
                      a Fund may cause Shareholders to bear duplicative fees.
                      The Advisor will waive its fees attributable to the assets
                      of the investing Fund invested in a money market fund of
                      HighMark, and, to the extent required by applicable law,
                      the Advisor will waive its fees attributable to the assets
                      of the Fund invested in any investment company. Some Funds
                      are subject to additional restrictions on investments in
                      other investment companies. See "INVESTMENT RESTRICTIONS"
                      in the Statement of Additional Information.
 
                        Each Fund may write covered calls on its equity
                      securities and enter into closing transactions with
                      respect to covered call options.
 
                        A Fund's assets may be invested in options, futures
                      contracts and options on futures, Standard & Poor's
                      Depositary Receipts ("SPDRs"), and investment grade bonds.
                      The aggregate value of options on securities (long puts
                      and calls) will not exceed 10% of a Fund's net assets at
                      the time such options are purchased by the Fund.
 
                        A Fund may enter into futures and options on futures
                      only to the extent that obligations under such contracts
                      or transactions, together with options on securities,
                      represent not more than 25% of the Fund's assets.
 
                                       16
<PAGE>   56
 
                        Each Fund may purchase options in stock indices to
                      invest cash on an interim basis. The aggregate premium
                      paid on all options on stock indices cannot exceed 20% of
                      the Fund's total assets.
 
                        All of the common stocks in which the Funds invest
                      (including foreign securities in the form of ADRs, but not
                      including Rule 144A Securities) are traded on registered
                      exchanges or in the over-the-counter market.
 
                        For further information, see "DESCRIPTION OF PERMITTED
                      INVESTMENTS."
 
                      Risk Factors
 
                        Since the Equity Funds invest in equity securities, each
                      Fund's Shares will fluctuate in value, and thus may be
                      more suitable for long-term investors who can bear the
                      risk of short-term fluctuations. In addition, the market
                      value of the fixed-income securities bears an inverse
                      relationship to changes in market interest rates, which
                      may affect the net asset value of Shares. The longer the
                      remaining maturity of a security, the greater is the
                      effect of interest rate changes on its market value.
                      Changes in the value of a Fund's fixed-income securities
                      will not affect cash income received from ownership of
                      such securities, but will affect a Fund's net asset value.
 
                        An Equity Fund may invest in convertible securities,
                      which include corporate bonds, notes or preferred stocks
                      that can be converted into common stocks or other equity
                      securities. Convertible securities also include other
                      securities, such as warrants, that provide an opportunity
                      for equity participation. Because convertible securities
                      can be converted into common stock, their values will
                      normally vary in some proportion with those of the
                      underlying common stock. Convertible securities usually
                      provide a higher yield than the underlying common stock,
                      however, so that the price decline of a convertible
                      security may sometimes be less substantial than that of
                      the underlying common stock. The value of convertible
                      securities that pay dividends or interest, like the value
                      of all fixed-income securities, generally fluctuates
                      inversely with changes in interest rates. Warrants have no
                      voting rights, pay no dividends and have no rights with
                      respect to the assets of the corporation issuing them.
                      They do not represent ownership of the securities for
                      which they are exercisable, but only the right to buy such
                      securities at a particular price. The Equity Funds will
                      not purchase any convertible debt security or convertible
                      preferred stock unless it has been rated as investment
                      grade at the time of acquisition by a NRSRO or that is not
                      rated but is determined to be of comparable quality by the
                      Advisor.
 
                        Given the uncertainty of the future value of emerging
                      growth companies and companies in special equity
                      situations, the risk of possible decline in value of the
                      Emerging Growth Fund's net assets are significant.
                      Companies in which the
 
                                       17
<PAGE>   57
 
                      Emerging Growth Fund invests may offer greater
                      opportunities for capital appreciation than larger more
                      established companies, but investment in such companies
                      may involve certain special risks. These risks may be due
                      to the greater business risks of small size, limited
                      markets and financial resources, narrow product lines and
                      frequent lack of depth in management. The securities of
                      such companies are often traded in the over-the-counter
                      market and may not be traded in volumes typical on a
                      national securities exchange. Thus, the securities of
                      emerging growth companies may be less liquid, and subject
                      to more abrupt or erratic market movements than securities
                      of larger, more established growth companies. Since a
                      "special equity situation" may involve a significant
                      change from a company's past experiences, the
                      uncertainties in the appraisal of the future value of the
                      company's equity securities and the risk of a possible
                      decline in the value of the Fund's investments are
                      significant.
 
INVESTMENT
LIMITATIONS             Each Fund may not:
 
                        1) Purchase securities of any one issuer, other than
                      obligations issued or guaranteed by the U.S. Government,
                      its agencies, or instrumentalities, if, immediately after
                      the purchase, more than 5% of the value of such Fund's
                      total assets would be invested in the issuer or the Fund
                      would hold more than 10% of any class of securities of the
                      issuer or more than 10% of the issuer's outstanding voting
                      securities (except that up to 25% of the value of the
                      Fund's total assets may be invested without regard to
                      these limitations).
 
                        2) Purchase any securities that would cause more than
                      25% of such Fund's total assets at the time of purchase to
                      be invested in securities of one or more issuers
                      conducting their principal business activities in the same
                      industry, provided that (a) there is no limitation with
                      respect to obligations issued or guaranteed by the U.S. or
                      foreign governments or their agencies or instrumentalities
                      and repurchase agreements secured by obligations of the
                      U.S. Government or its agencies or instrumentalities; (b)
                      wholly owned finance companies will be considered to be in
                      the industries of their parents if their activities are
                      primarily related to financing the activities of their
                      parents; and (c) utilities will be divided according to
                      their services (for example, gas, gas transmission,
                      electric and gas, electric, and telephone will each be
                      considered a separate industry);
 
                        3) Make loans, except that a Fund may purchase or hold
                      debt instruments, lend portfolio securities, and enter
                      into repurchase agreements in accordance with its
                      investment objective and policies.
 
                        The foregoing percentages will apply at the time of the
                      purchase of a security. The investment limitations listed
                      above are fundamental policies the substance of which may
                      not be changed without a vote of a majority of the
                      outstanding Shares
 
                                       18
<PAGE>   58
 
                      of the respective Fund. Additional fundamental and
                      non-fundamental investment limitations are set forth in
                      the Statement of Additional Information.
 
                      Portfolio Turnover
 
                        A Fund's portfolio turnover rate will not be a factor
                      preventing a sale or purchase when the Advisor believes
                      investment considerations warrant. Each of the Equity
                      Funds' portfolio turnover rate may vary greatly from year
                      to year as well as within a particular year. High
                      portfolio turnover rates generally will result in
                      correspondingly higher brokerage and other transactions
                      costs to the Equity Funds and could involve the
                      realization of capital gains that would be taxable when
                      distributed to Shareholders of the relevant Equity Fund.
                      See FEDERAL TAXATION.
 
PURCHASE AND
REDEMPTION OF
SHARES                  As noted above, each Fund (except the Blue Chip Growth
                      Fund, which is offered only in Fiduciary Shares) is
                      divided into two classes of Shares, Retail and Fiduciary.
                      Fiduciary Shares may be purchased at net asset value. Only
                      the following investors qualify to purchase an Equity
                      Fund's Fiduciary Shares: (i) fiduciary, advisory, agency,
                      custodial and other similar accounts maintained with Union
                      Bank of California, N.A. or its affiliates; (ii) Select
                      IRA accounts established with The Bank of California, N.A.
                      and invested in any of HighMark's Equity or Income Funds
                      prior to June 20, 1994, which have remained continuously
                      open thereafter and which are not considered to be
                      fiduciary accounts; (iii) Shareholders who currently own
                      Shares of HighMark's Equity or Income Funds that were
                      purchased prior to June 20, 1994 within an account
                      registered in their name with the Funds; and (iv) present
                      and retired directors, officers and employees (and their
                      spouses and children under the age of 21) of Union Bank of
                      California, N.A., HighMark's current or former
                      distributors or their respective affiliated companies who
                      currently own Shares of HighMark Funds which were
                      purchased before April 30, 1997. For a description of
                      investors who qualify to purchase Retail Shares, see the
                      Retail Shares prospectus of the Equity Funds.
 
                        Purchases and redemptions of Shares of the Funds may be
                      made on days on which both the New York Stock Exchange and
                      Federal Reserve wire system are open for business
                      ("Business Days"). The minimum initial investment is
                      generally $1,000 for each Fund and the minimum subsequent
                      investment is generally only $100. For present and retired
                      directors, officers, and employees (and their spouses and
                      children under the age of 21) of Union Bank of California,
                      SEI Financial Services Company and their affiliates, the
                      minimum initial investment is $250 and the minimum
                      subsequent investment is $50. A Fund's initial and
                      subsequent minimum purchase amounts may be waived if
                      purchases are made in connection with Individual
                      Retirement Accounts, Keoghs, payroll deduction plans, or
                      401(k) or similar plans. However, the minimum investment
                      may be
 
                                       19
<PAGE>   59
 
                      waived in the Distributor's discretion. Shareholders may
                      place orders by telephone.
 
                        Purchase orders will be effective if the Distributor
                      receives an order before 1:00 p.m., Pacific time (4:00
                      p.m., Eastern time) and the custodian receives Federal
                      funds before the close of business on the next Business
                      Day. The purchase price of Shares of a Fund is the net
                      asset value next determined after a purchase order is
                      received and accepted by HighMark. The net asset value per
                      Share of a Fund is determined by dividing the total market
                      value of a Fund's investments and other assets, less any
                      liabilities, by the total number of outstanding Shares of
                      a Fund. Net asset value per share is determined daily as
                      of 1:00 p.m., Pacific time (4:00 p.m., Eastern time) on
                      any Business Day. Purchases will be made in full and
                      fractional Shares of HighMark calculated to three decimal
                      places. HighMark reserves the right to reject a purchase
                      order when the Distributor determines that it is not in
                      the best interest of HighMark and/or its Shareholders to
                      accept such order.
 
                        Shares of the Funds are offered only to residents of
                      states in which the Shares are eligible for purchase.
 
                        Shareholders who desire to redeem shares of HighMark
                      must place their redemption orders prior to 1:00 p.m.,
                      Pacific time (4:00 p.m., Eastern time), on any Business
                      Day for the order to be accepted on that Business Day. The
                      redemption price is the net asset value of the Fund next
                      determined after receipt by the Distributor of the
                      redemption order. Payment on redemption will be made as
                      promptly as possible and, in any event, within seven
                      calendar days after the redemption order is received. The
                      Funds reserve the right to make payment for redemptions in
                      securities rather than cash.
 
                        Neither HighMark's transfer agent nor HighMark will be
                      responsible for any loss, liability, cost or expense for
                      acting upon wire instructions or upon telephone
                      instructions that it reasonably believes to be genuine.
                      HighMark and its transfer agent will each employ
                      reasonable procedures to confirm that telephone
                      instructions are genuine. Such procedures may include
                      taping of telephone conversations. If market conditions
                      are extraordinarily active or other extraordinary
                      circumstances exist, and you experience difficulties
                      placing redemption orders by telephone, you may wish to
                      consider placing your order by other means.
 
EXCHANGE
PRIVILEGES              As indicated under GENERAL INFORMATION--Description of
                      HighMark & Its Shares, certain of HighMark's Funds issue
                      two classes of Shares (Retail Shares and Fiduciary
                      Shares); as of the date of this Prospectus, the
                      Distribution Plan and distribution fee payable thereunder
                      are applicable only to such Fund's Retail Shares. A
                      Shareholder's eligibility to exchange into a particular
                      class of Shares will be determined at the time of the
                      exchange. The Shareholder must
 
                                       20
<PAGE>   60
 
                      supply, at the time of the exchange, the necessary
                      information to permit confirmation of qualification.
 
                        Each Fund's Shares may be exchanged for Shares of the
                      class of the various other Funds of HighMark which the
                      Shareholder qualifies to purchase directly so long as the
                      Shareholder maintains the applicable minimum account
                      balance in each Fund in which he or she owns Shares and
                      satisfies the minimum initial and subsequent purchase
                      amounts of the Fund into which the Shares are exchanged.
                      Shareholders may exchange their Fiduciary Shares for
                      Fiduciary Shares of another Fund on the basis of the
                      relative net asset value of the Fiduciary Shares
                      exchanged. Shareholders may also exchange Fiduciary Shares
                      of a Fund for Retail Shares of another Fund. Under such
                      circumstances, the cost of the acquired Retail Shares will
                      be the net asset value per share plus the appropriate
                      sales load.
 
                        Exchanges will be made on the basis of the relative net
                      asset values of the Shares exchanged plus any applicable
                      sales charge. Exchanges are subject to the terms and
                      conditions stated herein and the terms and conditions
                      stated in the respective prospectuses of the Funds.
 
                        Certain entities (including participating organizations
                      and Union Bank of California and its affiliates), however,
                      may charge customers a fee with respect to exchanges made
                      on the customer's behalf. Information about these charges,
                      if any, can be obtained by the entity effecting the
                      exchange and this Prospectus should be read in conjunction
                      with that information.
 
                        A Shareholder wishing to exchange Shares in an Equity
                      Fund may do so by contacting the transfer agent at
                      1-800-433-6884. Exchanges will be effected on any Business
                      Day at the net asset value of the Funds involved in the
                      exchange next determined after the exchange request is
                      received by the transfer agent.
 
                        An exchange is considered to be a sale of Shares for
                      federal income tax purposes on which a Shareholder may
                      realize a capital gain or loss. Exchange privileges may be
                      exercised only in those states where Shares of such other
                      Funds of HighMark may legally be sold. HighMark may
                      materially amend or terminate the exchange privileges
                      described herein upon sixty days' notice.
 
DIVIDENDS               The net income of each of the Equity Funds is declared
                      and paid monthly as a dividend to Shareholders of record
                      at the close of business on the day of declaration. Net
                      realized capital gains are distributed at least annually
                      to Shareholders of record.
 
                        Shareholders will automatically receive all income
                      dividends and capital gains distributions in additional
                      full and fractional Shares of a Fund at net asset value as
                      of the date of declaration (which is also the ex-dividend
                      date), unless the
 
                                       21
<PAGE>   61
 
                      Shareholder elects to receive such dividends or
                      distributions in cash. Shareholders wishing to receive
                      their dividends in cash (or wishing to revoke a previously
                      made election) must notify the transfer agent at P.O. Box
                      8416, Boston, MA 02266-8416, and such election (or
                      revocation thereof) will become effective with respect to
                      dividends and distributions having record dates after
                      notice has been received. Dividends paid in additional
                      Shares receive the same tax treatment as dividends paid in
                      cash.
 
FEDERAL
TAXATION                Each Equity Fund intends to qualify for treatment as a
                      "regulated investment company" under the Internal Revenue
                      Code of 1986, as amended (the "Code"), and to distribute
                      substantially all of its net investment income and net
                      realized capital gains so that each Fund is not required
                      to pay federal taxes on these amounts.
 
                        Distributions of ordinary income and/or an excess of net
                      short-term capital gain over net long-term capital loss
                      are treated for federal income tax purposes as ordinary
                      income to Shareholders. The 70 percent dividends received
                      deduction for corporations generally will apply to these
                      distributions to the extent the distribution represents
                      amounts that would qualify for the dividends received
                      deduction when received by a Fund if a Fund were a regular
                      corporation, and to the extent designated by a Fund as so
                      qualifying. Distributions by the Fund of the excess of net
                      long-term capital gain over net short-term capital loss is
                      taxable to Shareholders as long-term capital gain in the
                      year with respect to which it is received, regardless of
                      how long the Shareholder has held Shares of the Fund. Such
                      distributions are not eligible for the dividends received
                      deduction. If a Shareholder disposes of Shares in a Fund
                      at a loss before holding such Shares for longer than six
                      months, such loss will be treated as a long-term capital
                      loss to the extent the Shareholder has received long-term
                      capital gain dividends on the Shares.
 
                        Prior to purchasing Shares of the Equity Funds, the
                      impact of dividends or capital gain distributions that are
                      expected to be declared or have been declared, but not
                      paid, should be carefully considered. Dividends or capital
                      gain distributions received after a purchase of Shares are
                      subject to federal income taxes, although in some
                      circumstances, the dividends or distributions may be, as
                      an economic matter, a return of capital to the
                      Shareholder. A Shareholder should consult his or her
                      advisor for specific advice about the tax consequences to
                      the Shareholder of investing in a Fund.
 
                        Additional information regarding federal taxes is
                      contained in the Statement of Additional Information.
                      However, the foregoing and the material in the Statement
                      of Additional Information are only brief summaries of some
                      of the important tax considerations generally affecting
                      each Fund and its Shareholders.
 
                                       22
<PAGE>   62
 
                      In addition, the foregoing discussion and the federal tax
                      information in the Statement of Additional Information are
                      based on tax laws and regulations which are in effect as
                      of the date of this Prospectus; these laws and regulations
                      may subsequently change, and such changes could be
                      retroactive.
 
                        Shareholders will be advised at least annually as to the
                      federal income tax status of distributions made during the
                      year.
 
SERVICE
ARRANGEMENTS          The Advisor
 
                        Pacific Alliance Capital Management, a division of Union
                      Bank of California, N.A. serves as the Equity Funds'
                      investment advisor. Subject to the general supervision of
                      HighMark's Board of Trustees, the Advisor manages each
                      Fund in accordance with its investment objective and
                      policies, makes decisions with respect to and places
                      orders for all purchases and sales of the Fund's
                      investment securities, and maintains the Fund's records
                      relating to such purchases and sales.
 
                        For the expenses assumed and services provided by the
                      Advisor as each Fund's investment advisor, Union Bank of
                      California receives a fee from the Growth Fund, Value
                      Momentum Fund, Income Equity Fund and Blue Chip Growth
                      Fund, computed daily and paid monthly, at the annual rate
                      of sixty one-hundredths of one percent (.60%) of the
                      Fund's average daily net assets, and from the Emerging
                      Growth Fund, at the annual rate of eighty one-hundredths
                      of one percent (.80%) of the Fund's average daily net
                      assets. This fee may be higher than the advisory fee paid
                      by most mutual funds, although the Board of Trustees
                      believes it will be comparable to advisory fees paid by
                      many funds having similar objectives and policies. Union
                      Bank of California may from time to time agree to
                      voluntarily reduce its advisory fee, however, it is not
                      currently doing so. While there can be no assurance that
                      Union Bank of California will choose to make such an
                      agreement, any voluntary reductions in Union Bank of
                      California's advisory fee will lower the Fund's expenses,
                      and thus increase the Fund's yield and total return,
                      during the period such voluntary reductions are in effect.
                      During HighMark's fiscal year ended July 31, 1996, Union
                      Bank of California received investment advisory fees from
                      the Growth Fund aggregating 0.50% of the Fund's average
                      daily net assets, and from the Income Equity Fund
                      aggregating 0.66% of the Fund's average daily net assets.
                      As of the date of this prospectus, the Value Momentum
                      Fund, the Emerging Growth Fund, and the Blue Chip Equity
                      Fund had not yet commenced operations in HighMark.
 
                        On April 1, 1996, the Bank of California, N.A.,
                      HighMark's then investment advisor, combined with Union
                      Bank and the resulting bank changed its name to Union Bank
                      of California, N.A. At the same time, the banks'
                      investment management divisions were combined. Each of
                      Union Bank and The Bank of California, N.A. (or their
                      predecessor banks) has been in banking since the early
 
                                       23
<PAGE>   63
 
                      1900's and, historically, each has had significant
                      investment functions within its trust and investment
                      division. UnionBanCal Corporation, the parent of Union
                      Bank of California, N.A., is a publicly held corporation,
                      but is principally held by The Bank of Tokyo-Mitsubishi,
                      Ltd. As of September 30, 1996, Union Bank of California
                      and its subsidiaries had approximately $28.7 billion in
                      commercial assets. Pacific Alliance Capital Management is
                      a division of Union Bank of California's Trust and
                      Investment Management Group which, as of June 30, 1996,
                      had approximately $13.4 billion of assets under
                      management. The Advisor, with a team of approximately 45
                      stock and bond research analysts, portfolio managers and
                      traders, has been providing investment management services
                      to individuals, institutions and large corporations since
                      1917.
 
                        All investment decisions for the Equity Funds are made
                      by a team of investment professionals, all of whom take an
                      active part in the decision making process. The team
                      leaders for each Fund are as follows:
 
                           Growth Fund -- The team leader for the Growth Fund is
                           Scott Chapman. Mr. Chapman has been Growth Fund team
                           leader for the Advisor since 1993. He began working
                           for the Advisor as an equity security analyst in
                           1991.
 
                           Value Momentum Fund -- The team leader for the Value
                           Momentum Fund is Richard Earnest. Mr. Earnest, a
                           Senior Vice President of the Advisor, has served as
                           team leader of the Stepstone Value Momentum Fund
                           since its inception, and has been with the Advisor
                           and its predecessor, Union Bank, since 1964.
 
                           Income Equity Fund -- The team leader for the Income
                           Equity Fund is Thomas Arrington. Mr. Arrington began
                           working for the Advisor as a Business Administration
                           Manager in 1990. From 1991 to 1994 Mr. Arrington was
                           a Securities Research Analyst. In 1994 Mr. Arrington
                           became team leader for the Income Equity Fund.
 
                      Sub-Advisor
 
                        The Advisor and Bank of Tokyo-Mitsubishi Trust Company
                      (the "Sub-Advisor") have entered into an investment
                      subadvisory agreement relating to the Emerging Growth and
                      Blue Chip Growth Funds (the "Investment Sub-Advisory
                      Agreement"). Under the Investment Sub-Advisory Agreement,
                      the Sub-Advisor will make the day-to-day investment
                      decisions for the assets of the Emerging Growth and Blue
                      Chip Growth Funds, subject to the supervision of, and
                      policies established by, the Advisor and the Trustees of
                      HighMark.
 
                                       24
<PAGE>   64
 
                        Bank of Tokyo-Mitsubishi Trust Company, headquartered at
                      1251 Avenue of the Americas, New York, New York 10116,
                      operates as a wholly-owned subsidiary of The Bank of
                      Tokyo-Mitsubishi, Ltd. The Sub-Advisor was formed by the
                      combination on April 1, 1996, of Bank of Tokyo Trust
                      Company, a wholly-owned subsidiary of The Bank of Tokyo,
                      Ltd., and Mitsubishi Bank Trust Company of New York, a
                      wholly-owned subsidiary of The Mitsubishi Bank, Limited.
                      Bank of Tokyo Trust Company was the surviving entity, and
                      changed its name to Bank of Tokyo-Mitsubishi Trust
                      Company. Prior to the combination, subadvisory services
                      were provided by Bank of Tokyo Trust Company. Bank of
                      Tokyo Trust Company was established in 1955, and has
                      provided trust services since that time and management
                      services since 1965.
 
                        The Sub-Advisor serves as portfolio manger to bank
                      common funds, employee benefit funds and personal trust
                      accounts, managing assets in money market, equity and
                      fixed income portfolios. As of June 30, 1996, the
                      Sub-Advisor managed $700 million in individual portfolios
                      and collective funds. In addition, the Sub-Advisor will
                      also serve as Sub-Advisor to HighMark's Government
                      Securities and Convertible Securities Funds.
 
                        The Sub-Advisor is entitled to a fee, which is
                      calculated daily and paid monthly out of the Advisor's
                      fee, at an annual rate of .50% of the average daily net
                      assets of the Emerging Growth Fund and .30% of the average
                      daily net assets of the Blue Chip Growth Fund. As of the
                      date of this prospectus, the Emerging Growth Fund and the
                      Blue Chip Growth Fund had not yet commenced operations in
                      HighMark.
 
                        Seth E. Shalov will serve as portfolio manager to the
                      Emerging Growth Fund. Mr. Shalov has been a Senior
                      Portfolio Manager with the Sub-Advisor and its
                      predecessor, Bank of Tokyo Trust Company, since October,
                      1987.
 
                        The day-to-day management of the Blue Chip Growth Fund's
                      investments is the responsibility of a team of investment
                      professionals.
 
                      Administrator
 
                        SEI Fund Resources (the "Administrator") and HighMark
                      are parties to an administration agreement (the
                      "Administration Agreement"). Under the terms of the
                      Administration Agreement, the Administrator provides
                      HighMark with certain management services, including all
                      necessary office space, equipment, personnel, and
                      facilities.
 
                        The Administrator is entitled to a fee, which is
                      calculated daily and paid monthly, at an annual rate of
                      .20% of the average daily net assets of the Funds. The
                      Administrator may waive its fee or reimburse various
                      expenses to the extent necessary to limit the total
                      operating expenses of a Fund's Fiduciary Shares. Any
 
                                       25
<PAGE>   65
 
                      such waiver is voluntary and may be terminated at any time
                      in the Administrator's sole discretion. Currently, the
                      Administrator has agreed to waive its fee to the rate of
                      .18% of the average daily net assets of the Funds.
 
                        Pursuant to a separate agreement with the Administrator,
                      Union Bank of California, N.A. performs sub-administration
                      services on behalf of each Fund, for which it receives a
                      fee paid by the Administrator at the annual rate of up to
                      0.05% of the average daily net assets of the Funds. Union
                      Bank of California has voluntarily agreed to reduce this
                      fee to 0.03%, but reserves the right to terminate its
                      waiver at any time in its sole discretion. A description
                      of the services performed by Union Bank of California
                      pursuant to this Agreement is contained in the Statement
                      of Additional Information.
 
                      The Transfer Agent
 
                        State Street Bank and Trust Company serves as the
                      transfer agent, dividend disbursing agent, and as a
                      shareholder servicing agent for the Fiduciary Shares of
                      HighMark for which services it receives a fee.
 
                      Shareholder Service Plan
 
                        To support the provision of Shareholder services to both
                      classes of Shares, HighMark has adopted a Shareholder
                      Service Plan. A description of the services performed by
                      service providers pursuant to the Shareholder Service Plan
                      is contained in the Statement of Additional Information.
                      In consideration of services provided by any service
                      provider, which may include Union Bank of California,
                      N.A., Bank of Tokyo-Mitsubishi, Ltd., or their respective
                      affiliates, each Fund may pay a fee at the rate of up to
                      0.25% of its average daily net assets to such service
                      provider. The service provider may waive such fees at any
                      time. Any such waiver is voluntary and may be terminated
                      at any time. Currently, such fees are being waived to the
                      rate of 0.10% of average daily net assets for the
                      Fiduciary Shares of the Income Equity Fund, 0.09% for the
                      Fiduciary Shares of the Growth Fund and 0.00% for the
                      Fiduciary Shares of the Value Momentum, Blue Chip Growth
                      and Emerging Growth Funds.
 
                      Distributor
 
                        SEI Financial Services Company (the "Distributor") and
                      HighMark are parties to a distribution agreement
                      ("Distribution Agreement"). The Distribution Agreement is
                      renewable annually and may be terminated by the
                      Distributor, by a majority vote of the Disinterested
                      Trustees or by a majority vote of the outstanding
                      securities of HighMark upon not more than 60 days written
                      notice by either party, or upon assignment by the
                      Distributor. Fiduciary Shares are not subject to
                      HighMark's Distribution Plan or a distribution fee.
 
                                       26
<PAGE>   66
 
                      Banking Laws
 
                        Union Bank of California believes that it may perform
                      the services for the Funds contemplated by its investment
                      advisory agreement with HighMark without a violation of
                      applicable banking laws and regulations. Union Bank of
                      California also believes that it may perform
                      sub-administration and sub-accounting services on behalf
                      of each Fund, for which it receives compensation from SEI
                      Fund Resources without a violation of applicable banking
                      laws and regulations. Future changes in federal or state
                      statutes and regulations relating to permissible
                      activities of banks or bank holding companies and their
                      subsidiaries and affiliates, as well as further judicial
                      or administrative decisions or interpretations of present
                      and future statutes and regulations, could change the
                      manner in which Union Bank of California or the Advisor
                      could continue to perform such services for the Funds. For
                      a further discussion of applicable banking laws and
                      regulations, see the Statement of Additional Information.
 
                      Custodian
 
                        Union Bank of California also serves as the custodian
                      and as a shareholder servicing agent for the Equity Funds.
                      The Custodian holds cash securities and other assets of
                      HighMark as required by the 1940 Act.
 
                        Services performed by Union Bank of California, as the
                      Funds' shareholder servicing agent and custodian, as well
                      as the basis of remuneration for such services, are
                      described in the Statement of Additional Information.
 
GENERAL
INFORMATION           Description of Highmark & Its Shares
 
                        HighMark was organized as a Massachusetts business trust
                      on March 10, 1987, and consists of sixteen series of
                      Shares open for investment representing units of
                      beneficial interest in HighMark's Growth Fund, Income
                      Equity Fund, Balanced Fund, Value Momentum Fund, Blue Chip
                      Growth Fund, Emerging Growth Fund, International Equity
                      Fund, Bond Fund, Intermediate-Term Bond Fund, Government
                      Securities Fund, Convertible Securities Fund, California
                      Intermediate Tax-Free Bond Fund, Diversified Money Market
                      Fund, U.S. Government Obligations Money Market Fund, 100%
                      U.S. Treasury Obligations Money Market Fund, and
                      California Tax-Free Money Market Fund. As of the date
                      hereof, no Shares of the Value Momentum Fund, the Blue
                      Chip Growth Fund, the Emerging Growth Fund, the
                      International Equity Fund, the Intermediate-Term Bond
                      Fund, the Convertible Securities Fund, the Government
                      Securities Fund, and the California Intermediate Tax-Free
                      Bond Fund had been offered for sale in the HighMark Group.
                      Shares of each Fund are freely transferable, are entitled
                      to distributions from the assets of the Fund as declared
                      by the Board of
 
                                       27
<PAGE>   67
 
                      Trustees, and, if HighMark were liquidated, would receive
                      a pro rata share of the net assets attributable to that
                      Fund. Shares are without par value.
 
                        As noted above, pursuant to a Multiple Class Plan on
                      file with the Securities and Exchange Commission
                      permitting the issuance and sale of two classes of Shares
                      in selected Funds, Shares of such Funds have been divided
                      into two classes, designated Retail Shares and Fiduciary
                      Shares. For information regarding the Retail Shares of the
                      Equity Funds, interested persons may contact the
                      Distributor for a prospectus at 1-800-433-6884.
 
                        HighMark believes that as of November 22, 1996, Union
                      Bank of California (475 Sansome Street, Post Office Box
                      45000, San Francisco, CA 94104) was the Shareholder of
                      record of 85.57% of the Fiduciary Shares of the Growth
                      Fund and 73.24% of the Fiduciary Shares of the Income
                      Equity Fund. As of November 22, 1996, the Value Momentum,
                      Emerging Growth and Blue Chip Growth Funds had not yet
                      commenced operations in HighMark.
 
                      Performance Information
 
                        From time to time, HighMark may advertise the aggregate
                      total return, average annual total return, yield and
                      distribution rate with respect to the Fiduciary Shares of
                      each Equity Fund. Performance information is computed
                      separately for a Fund's Retail and Fiduciary Shares in
                      accordance with the formulas described below.
 
                        The aggregate total return and average annual total
                      return of the Equity Funds may be quoted for the life of
                      each Fund and for ten-year, five-year, three-year, and
                      one-year periods, in each case through the most recent
                      calendar quarter (in the case of the Income Equity Fund,
                      utilizing, when appropriate, the aggregate total return
                      and average annual total return of the IRA Fund Income
                      Equity Portfolio prior to June 23, 1988). Aggregate total
                      return is determined by calculating the change in the
                      value of a hypothetical $1,000 investment in a Fund over
                      the applicable period that would equate the initial amount
                      invested to the ending redeemable value of the investment.
                      The ending redeemable value includes dividends and capital
                      gain distributions reinvested at net asset value. Average
                      annual total return is calculated by annualizing a Fund's
                      aggregate total return over the relevant number of years.
                      The resulting percentage indicates the average positive or
                      negative investment results that an investor in a Fund
                      would have experienced on an annual basis from changes in
                      Share price and reinvestment of dividends and capital gain
                      distributions.
 
                        The yield of a Fund is determined by annualizing the net
                      investment income per Share of the Fund during a specified
                      thirty-day period and dividing that
 
                                       28
<PAGE>   68
 
                      amount by the per Share public offering price of the Fund
                      on the last day of the period.
 
                        The distribution rate of a Fund is determined by
                      dividing the income and capital gains distributions, or
                      where indicated the income distributions alone, on a Share
                      of the Fund over a twelve-month period by the per Share
                      public offering price of the Fund on the last day of the
                      period.
 
                        Each Fund may periodically compare its performance to
                      the performance of other mutual funds tracked by mutual
                      fund rating services (such as Lipper Analytical);
                      financial and business publications and periodicals; broad
                      groups of comparable mutual funds; unmanaged indices which
                      may assume investment of dividends but generally do not
                      reflect deductions for administrative and management
                      costs; or other investment alternatives. Certain Funds may
                      advertise performance that includes results from periods
                      in which the Fund's assets were managed in a
                      non-registered predecessor vehicle.
 
                        All performance information presented for a Fund is
                      based on past performance and does not predict future
                      performance.
 
                      Miscellaneous
 
                        Shareholders will be sent unaudited semi-annual reports
                      and annual reports audited by independent public
                      accountants.
 
                        Shareholders are entitled to one vote for each Share
                      held in a Fund as determined on the record date for any
                      action requiring a vote by the Shareholders, and a
                      proportionate fractional vote for each fractional Share
                      held. Shareholders of HighMark will vote in the aggregate
                      and not by series or class except (i) as otherwise
                      expressly required by law or when HighMark's Board of
                      Trustees determines that the matter to be voted upon
                      affects only the interests of the Shareholders of a
                      particular series or particular class, and (ii) only
                      Retail Shares will be entitled to vote on matters
                      submitted to a Shareholder vote relating to the
                      Distribution Plan. HighMark is not required to hold
                      regular annual meetings of Shareholders, but may hold
                      special meetings from time to time.
 
                        HighMark's Trustees are elected by Shareholders, except
                      that vacancies may be filled by vote of the Board of
                      Trustees. Trustees may be removed by the Board of
                      Trustees, or by Shareholders at a meeting called for such
                      purpose. For information about how Shareholders may call
                      such a meeting and communicate with other Shareholders for
                      that purpose, see ADDITIONAL INFORMATION--Miscellaneous in
                      the Statement of Additional Information.
 
                        Inquiries may be directed in writing to SEI Financial
                      Services Company,Oaks, Pennsylvania 19456, or by calling
                      toll free 1-800-433-6884.
 
                                       29
<PAGE>   69
 
DESCRIPTION OF
PERMITTED
INVESTMENTS             The following is a description of permitted investments
                      for the HighMark Equity Funds.
 
                        AMERICAN DEPOSITARY RECEIPTS (ADRs)--ADRs are receipts
                      typically issued by a U.S. financial institution that
                      evidence ownership of underlying securities issued by a
                      foreign issuer.
 
                        ASSET-BACKED SECURITIES (NON-MORTGAGE)--Instruments
                      secured by company receivables, truck and auto loans,
                      leases, and credit card receivables. Such securities are
                      generally issued as pass-through certificates, which
                      represent undivided fractional ownership interests in the
                      underlying pools of assets. Such securities also may be
                      debt instruments, which are also known as collateralized
                      obligations and are generally issued as the debt of a
                      special purpose entity, such as a trust, organized solely
                      for the purpose of owning such assets and issuing such
                      debt. The purchase of non-mortgage asset-backed securities
                      raises risk considerations peculiar to the financing of
                      the instruments underlying such securities. Asset-backed
                      securities entail prepayment risk, which may vary
                      depending on the type of asset, but is generally less than
                      the prepayment risk associated with mortgage-backed
                      securities.
 
                        Like mortgages underlying mortgage-backed securities,
                      underlying automobile sales contracts or credit card
                      receivables are subject to substantial prepayment risk,
                      which may reduce the overall return to certificate
                      holders. Nevertheless, principal prepayment rates tend not
                      to vary as much in response to changes in interest rates
                      and the short-term nature of the underlying car loans or
                      other receivables tend to dampen the impact of any change
                      in the prepayment level. Certificate holders may also
                      experience delays in payment on the certificates if the
                      full amounts due on underlying sales contracts or
                      receivables are not realized by the trust because of
                      unanticipated legal or administrative costs of enforcing
                      the contracts or because of depreciation or damage to the
                      collateral (usually automobiles) securing certain
                      contracts, or other factors. If consistent with their
                      investment objectives and policies, the Equity Funds may
                      invest in other asset-backed securities that may be
                      developed in the future.
 
                        BANKERS' ACCEPTANCES--Bills of exchange or time drafts
                      drawn on and accepted by commercial banks. They are used
                      by corporations to finance the shipment and storage of
                      goods and to furnish dollar exchange. Maturities are
                      generally six months or less.
 
                        CERTIFICATES OF DEPOSIT--Negotiable interest-bearing
                      instruments with a specific maturity. Certificates of
                      deposit are issued by banks and savings and loan
                      institutions in exchange for the deposit of funds and
                      normally can be traded in the secondary market prior to
                      maturity.
 
                                       30
<PAGE>   70
 
                        COMMERCIAL PAPER--Unsecured short-term promissory notes
                      issued by corporations and other entities. Maturities on
                      these issues vary from a few days to nine months. Purchase
                      of such instruments involves a risk of default by the
                      issuer.
 
                        CONVERTIBLE BONDS AND CONVERTIBLE PREFERRED
                      STOCK--Convertible Bonds are bonds convertible into a set
                      number of shares of another form of security (usually
                      common stock) at a prestated price. Convertible bonds have
                      characteristics similar to both fixed-income and equity
                      securities. Convertible preferred stock is a class of
                      capital stock that pays dividends at a specified rate and
                      that has preference over common stock in the payment of
                      dividends and the liquidation of assets. Convertible
                      preferred stock is preferred stock exchangeable for a
                      given number of common stock shares, and has
                      characteristics similar to both fixed-income and equity
                      securities. Because of the conversion feature, the market
                      value of convertible bonds and convertible preferred stock
                      tend to move together with the market value of the
                      underlying stock. As a result, a Fund's selection of
                      convertible bonds and convertible preferred stock is
                      based, to a great extent, on the potential for capital
                      appreciation that may exist in the underlying stock. The
                      value of convertible bonds and convertible preferred stock
                      is also affected by prevailing interest rates, the credit
                      quality of the issuer and any call provisions.
 
                        DERIVATIVES--Instruments whose value is derived from an
                      underlying contract, index or security, or any combination
                      thereof, including futures, options (e.g., puts and
                      calls), options on futures, swap agreements, and some
                      mortgage-backed securities (CMOs, REMICs, IOs and POs).
                      See elsewhere in this "DESCRIPTION OF PERMITTED
                      INVESTMENTS" for discussions of these various instruments,
                      and see "INVESTMENT OBJECTIVES" and "INVESTMENT POLICIES"
                      for more information about any policies and limitations
                      applicable to their use.
 
                        FUTURES AND OPTIONS ON FUTURES--Some futures strategies,
                      including selling futures, buying puts and writing calls,
                      reduce a Fund's exposure to price fluctuations. Other
                      strategies, including buying futures, writing puts and
                      buying calls, tend to increase market exposure. Futures
                      and options may be combined with each other in order to
                      adjust the risk and return characteristics of the overall
                      portfolio.
 
                        Options and futures can be volatile instruments, and
                      involve certain risks that, if applied at an inappropriate
                      time, could negatively impact a Fund's return.
 
                        INVESTMENT GRADE BONDS--Interest-bearing or discounted
                      government or corporate securities that obligate the
                      issuer to pay the bondholder a specified sum of money,
                      usually at specific intervals, and to repay the principal
                      amount of the loan at maturity. Investment grade bonds are
                      those rated BBB or better by
 
                                       31
<PAGE>   71
 
                      S&P or Baa or better by Moody's or similarly rated by
                      other NRSROs, or, if not rated, determined to be of
                      comparable quality by the Advisor.
 
                        MONEY MARKET INSTRUMENTS--Short-term, debt instruments
                      or deposits and may include, for example, (i) commercial
                      paper rated within the highest rating category by a NRSRO
                      at the time of investment, or, if not rated, determined by
                      the Advisor to be of comparable quality; (ii) obligations
                      (certificates of deposit, time deposits, bank master
                      notes, and bankers' acceptances) of thrift institutions,
                      savings and loans, U.S. commercial banks (including
                      foreign branches of such banks), and U.S. and foreign
                      branches of foreign banks, provided that such institutions
                      (or, in the case of a branch, the parent institution) have
                      total assets of $1 billion or more as shown on their last
                      published financial statements at the time of investment;
                      (iii) short-term corporate obligations rated within the
                      three highest rating categories by a NRSRO (e.g., at least
                      A by S&P or A by Moody's) at the time of investment, or,
                      if not rated, determined by the Advisor to be of
                      comparable quality; (iv) general obligations issued by the
                      U.S. Government and backed by its full faith and credit,
                      and obligations issued or guaranteed as to principal and
                      interest by agencies or instrumentalities of the U.S.
                      Government (e.g., obligations issued by Farmers Home
                      Administration, Government National Mortgage Association,
                      Federal Farm Credit Bank and Federal Housing
                      Administration); (v) receipts, including TRs, TIGRs and
                      CATS; (vi) repurchase agreements involving such
                      obligations; (vii) loan participations issued by a bank in
                      the United States with assets exceeding $1 billion and for
                      which the underlying loan is issued by borrowers in whose
                      obligations the Fund may invest; (viii) money market funds
                      and (ix) foreign commercial paper.
 
                        Certain of the obligations in which a Fund may invest
                      may be variable or floating rate instruments, may involve
                      conditional or unconditional demand features and may
                      include variable amount master demand notes.
 
                        OPTIONS--Under a call option, the purchaser of the
                      option has the right to purchase, and the writer (the
                      Fund) the obligation to sell, the underlying security at
                      the exercise price during the option period. A put option
                      gives the purchaser the right to sell, and the writer the
                      obligation to purchase, the underlying security at the
                      exercise price during the option period.
 
                        In addition, certain Funds may buy options on stock
                      indices to invest cash on an interim basis. Such options
                      will be listed on a national securities exchange. In order
                      to close out an option position, a Fund may enter into a
                      "closing purchase transaction" -- the purchase of an
                      option on the same security with the same exercise price
                      and expiration date as the option contract previously
                      written on any particular security. When the security is
                      sold, a Fund effects a closing purchase transaction so as
                      to close out any existing option on that security.
 
                                       32
<PAGE>   72
 
                        There are risks associated with such investments
                      including the following: (1) the success of a hedging
                      strategy may depend on the ability of the Advisor or
                      Sub-Advisor to predict movements in the prices of
                      individual securities, fluctuations in markets and
                      movements in interest rates; (2) there may be an imperfect
                      correlation between the movement in prices of securities
                      held by a Fund and the price of options; (3) there may not
                      be a liquid secondary market for options; and (4) while a
                      Fund will receive a premium when it writes covered call
                      options, it may not participate fully in a rise in the
                      market value of the underlying security.
 
                        RECEIPTS--Interests in separately traded interest and
                      principal component parts of U.S. Treasury obligations
                      that are issued by banks and brokerage firms and are
                      created by depositing Treasury notes and Treasury bonds
                      into a special account at a custodian bank. The custodian
                      holds the interest and principal payments for the benefit
                      of the registered owners of the certificates of such
                      receipts. The custodian arranges for the issuance of the
                      certificates or receipts evidencing ownership and
                      maintains the register. Receipts include "Treasury
                      Receipts" ("TR's"), "Treasury Investment Growth Receipts"
                      ("TIGR's"), and "Certificates of Accrual on Treasury
                      Securities" ("CATS"). TR's, TIGR's and CATS are sold as
                      zero coupon securities, which means that they are sold at
                      a substantial discount and redeemed at face value at their
                      maturity date without interim cash payments of interest or
                      principal. This discount is accreted over the life of the
                      security, and such accretion will constitute the income
                      earned on the security for both accounting and tax
                      purposes. Because of these features, such securities may
                      be subject to greater interest rate volatility than
                      interest-paying securities. See also "FEDERAL TAXATION."
 
                        REPURCHASE AGREEMENTS--Agreements whereby a Fund will
                      acquire securities from approved financial institutions or
                      registered broker-dealers that agree to repurchase the
                      securities at a mutually agreed-upon date and price. The
                      repurchase agreements entered into by the Funds will
                      provide that the underlying security at all times shall
                      have a value equal to 102% of the resale price stated in
                      the agreement. Repurchase agreements involving government
                      securities are not subject to a Fund's fundamental
                      investment limitation on purchasing securities of any one
                      issuer. If the seller defaults on its repurchase
                      obligation or becomes insolvent, the Fund holding such
                      obligations would suffer a loss to the extent that either
                      the proceeds from a sale of the underlying portfolio
                      securities were less than the repurchase price or the
                      Fund's disposition of the securities was delayed pending
                      court action. Securities subject to repurchase agreements
                      will be held by a qualified custodian or in the Federal
                      Reserve/Treasury book-entry system. Repurchase agreements
                      are considered to be loans by a Fund under the Investment
                      Company Act of 1940 (the "1940 Act").
 
                                       33
<PAGE>   73
 
                        REVERSE REPURCHASE AGREEMENTS--A Fund may borrow funds
                      for temporary purposes by entering into reverse repurchase
                      agreements, provided such action is consistent with the
                      Fund's investment objective and fundamental investment
                      restrictions; as a matter of non-fundamental policy, each
                      Fund intends to limit such investments to no more than 10%
                      of the value of its total assets. Pursuant to a reverse
                      repurchase agreement, a Fund will sell portfolio
                      securities to financial institutions such as banks or to
                      broker-dealers, and agree to repurchase the securities at
                      a mutually agreed-upon date and price. A Fund intends to
                      enter into reverse repurchase agreements only to avoid
                      otherwise selling securities during unfavorable market
                      conditions to meet redemptions. At the time a Fund enters
                      into a reverse repurchase agreement, it will place in a
                      segregated custodial account assets such as U.S.
                      Government securities or other liquid, high-quality debt
                      securities consistent with the Fund's investment objective
                      having a value equal to 102% of the repurchase price
                      (including accrued interest), and will subsequently
                      monitor the account to ensure that an equivalent value is
                      maintained. Reverse repurchase agreements involve the risk
                      that the market value of the securities sold by a Fund may
                      decline below the price at which a Fund is obligated to
                      repurchase the securities. Reverse repurchase agreements
                      are considered to be borrowings by a Fund under the 1940
                      Act.
 
                        RULE 144A SECURITIES--Rule 144A Securities are
                      securities that have not been registered under the
                      Securities Act of 1933, but which may be traded between
                      certain qualified institutional investors, including
                      investment companies. The absence of a secondary market
                      may affect the value of the Rule 144A Securities. The
                      Board of Trustees of HighMark has established guidelines
                      and procedures to be utilized to determine the liquidity
                      of such securities.
 
                        SECURITIES ISSUED ON A FORWARD COMMITMENT BASIS OR
                      WHEN-ISSUED SECURITIES--Securities purchased for delivery
                      beyond the normal settlement date at a stated price and
                      yield and which thereby involve a risk that the yield
                      obtained in the transaction will be less than that
                      available in the market when delivery takes place. When a
                      Fund agrees to purchase when-issued securities or enter
                      into forward commitments, HighMark's custodian will be
                      instructed to set aside cash or liquid portfolio
                      securities equal to the amount of the commitment in a
                      segregated account. A Fund will generally not pay for such
                      securities and no income will accrue on the securities
                      until they are received. These securities are recorded as
                      an asset and are subject to changes in value based upon
                      changes in the general level of interest rates. Therefore,
                      the purchase of securities on a "when-issued" basis or
                      forward commitments may increase the risk of fluctuations
                      in a Fund's net asset value.
 
                        SECURITIES LENDING--During the time portfolio securities
                      are on loan from a Fund, the borrower will pay the Fund
                      any dividends or interest paid on the
 
                                       34
<PAGE>   74
 
                      securities. In addition, loans will be subject to
                      termination by the Fund or the borrower at any time and,
                      while a Fund will generally not have the right to vote
                      securities on loan, it will terminate the loan and regain
                      the right to vote if that is considered important with
                      respect to the investment. While the lending of securities
                      may subject a Fund to certain risks, such as delays or an
                      inability to regain the securities in the event the
                      borrower were to default on its lending agreement or enter
                      into bankruptcy, a Fund will receive 100% collateral in
                      the form of cash or U.S. Government securities. This
                      collateral will be valued daily by the lending agent, with
                      oversight by the Advisor, and, should the market value of
                      the loaned securities increase, the borrower will be
                      required to furnish additional collateral to the Fund.
 
                        SECURITIES SUBJECT TO A PUT FEATURE--A "put" feature
                      permits a Fund to sell a fixed income security at a fixed
                      price prior to maturity. The underlying fixed income
                      securities subject to a put may be sold at any time at the
                      market rates. However, unless the put was an integral part
                      of the fixed income security as originally issued, it may
                      not be marketable or assignable. Generally, a premium is
                      paid for a put feature or a put feature is purchased
                      separately which results in a lower yield than would
                      otherwise be available for the same fixed income
                      securities.
 
                        STANDARD & POOR'S DEPOSITARY RECEIPTS (SPDRs)--SPDRs are
                      interests in a unit investment trust holding a portfolio
                      of securities linked to the S&P 500 Index. SPDRs closely
                      track the underlying portfolio of securities, trade like a
                      share of common stock and pay periodic dividends
                      proportionate to those paid by the portfolio of stocks
                      that constitutes the S&P 500 Index. For further
                      information regarding SPDRs, see the Statement of
                      Additional Information.
 
                        TIME DEPOSITS--Non-negotiable receipts issued by U.S. or
                      foreign banks in exchange for the deposit of funds. Like
                      certificates of deposit, they earn a specified rate of
                      interest over a definite period of time; however, they
                      cannot be traded in the secondary market. Time deposits
                      with a withdrawal penalty are considered to be illiquid
                      securities.
 
                        U.S. GOVERNMENT AGENCY SECURITIES--Certain Federal
                      agencies have been established as instrumentalities of the
                      U.S. Government to supervise and finance certain types of
                      activities. Issues of these agencies, while not direct
                      obligations of the U.S. Government, are either backed by
                      the full faith and credit of the United States (e.g., GNMA
                      securities) or supported by the issuing agencies' right to
                      borrow from the U.S. Treasury. The issues of other
                      agencies are supported only by the credit of the
                      instrumentality (e.g., FNMA securities).
 
                        U.S. TREASURY OBLIGATIONS--Bills, notes, and bonds
                      issued by the U.S. Treasury, as well as separately traded
                      interest and principal component parts of
 
                                       35
<PAGE>   75
 
                      such obligations known as Separately Traded Registered
                      Interest and Principal Securities ("STRIPS") that are
                      transferable through the Federal book-entry system.
 
                        U.S. Government Securities generally do not involve the
                      credit risks associated with investments in other types of
                      fixed-income securities, although, as a result, the yields
                      available from U.S. Government Securities are generally
                      lower than the yields available from otherwise comparable
                      corporate fixed-income securities. Like other fixed-income
                      securities, however, the values of U.S. Government
                      Securities change as interest rates fluctuate.
                      Fluctuations in the value of portfolio securities will in
                      many cases not affect interest income on existing
                      portfolio securities, but will be reflected in the Fund's
                      net asset value. Because the magnitude of these
                      fluctuations will generally be greater at times when a
                      Fund's average maturity is longer, under certain market
                      conditions the Fund may invest in short-term investments
                      yielding lower current income rather than investing in
                      higher yielding longer-term securities.
 
                        VARIABLE AND FLOATING RATE INSTRUMENTS--Obligations that
                      may carry variable or floating rates of interest, may
                      involve conditional or unconditional demand features and
                      may include variable amount master demand notes. The
                      interest rates on these securities may be reset daily,
                      weekly, quarterly or some other reset period, and may have
                      a floor or ceiling on interest rate changes. There is a
                      risk that the current interest rate on such obligations
                      may not accurately reflect existing market interest rates.
                      A demand instrument with a demand notice period exceeding
                      seven days may be considered illiquid if there is no
                      secondary market for such security.
 
                        WARRANTS--Securities that entitle the holder to buy a
                      proportionate amount of common stock at a specified price
                      for a limited or unlimited period of time. Warrants are
                      often freely transferable and are traded on major stock
                      exchanges.
 
                        YANKEE BONDS--Dollar denominated securities issued by
                      foreign-domiciled issuers that obligate the issuer to pay
                      the bondholder a specified sum of money, usually
                      semiannually, and to repay the principal amount of the
                      loan at maturity. Sovereign bonds are bonds issued by the
                      governments of foreign countries. Supranational bonds are
                      those issued by supranational entities, such as the World
                      Bank and European Investment Bank. Canadian bonds are
                      bonds issued by Canadian provinces.
 
                        ZERO-COUPON OBLIGATIONS--Non-income producing securities
                      evidencing ownership of future interest and principal
                      payments on bonds. These obligations pay no current
                      interest and are typically sold at prices greatly
                      discounted from par value. The return on a zero-coupon
                      obligation, when held to maturity, equals the difference
                      between the par value and the original purchase price.
 
                                       36
<PAGE>   76
 
                        For federal income tax purposes, the difference between
                      the par value and the original issue price (original issue
                      discount) is included in the income of a holder of a
                      zero-coupon obligation over the term of the obligation
                      even though the interest is not paid until maturity. The
                      amount included in income is determined under a constant
                      interest rate method. In addition, if an obligation is
                      purchased subsequent to its original issue, a holder such
                      as the Income Funds may elect to include market discount
                      in income currently on a ratable accrual method or a
                      constant interest rate method. Market discount is the
                      difference between the obligation's "adjusted issue price"
                      (the original issue price plus original issue discount
                      accrued to date) and the holder's purchase price. If no
                      such election is made, gain on the disposition of a market
                      discount obligation is treated as ordinary income (rather
                      than capital gain) to the extent it does not exceed the
                      accrued market discount.
 
                        Zero-coupon obligations have greater price volatility
                      than other fixed-income obligations of similar maturity
                      and such obligations will be purchased when the yield
                      spread, in light of the obligation's duration, is
                      considered advantageous.
 
                                       37
<PAGE>   77
 
                             HighMark EQUITY FUNDS
                            INVESTMENT PORTFOLIOS OF
                                 HighMark FUNDS
                   For further information (including current
                  yield, purchase and redemption information),
                             call 1-(800) 433-6884
 
INVESTMENT ADVISOR
Pacific Alliance Capital Management,
a division of Union Bank of California, N.A.
475 Sansome Street
Post Office Box 45000
San Francisco, CA 94104
 
SUB-ADVISOR
Bank of Tokyo-Mitsubishi Trust Company
1251 Avenue of the Americas
New York, New York 10116
 
CUSTODIAN
Union Bank of California, N.A.
475 Sansome Street
Post Office Box 45000
San Francisco, CA 94104
 
ADMINISTRATOR & DISTRIBUTOR
SEI Fund Resources and
SEI Financial Services Company
Oaks, Pennsylvania 19456
 
LEGAL COUNSEL
Ropes & Gray
One Franklin Square
1301 K Street, N.W., Suite 800 East
Washington, D.C. 20005
 
AUDITORS
Deloitte & Touche LLP
1700 Courthouse Plaza Northeast
Dayton, OH 45402
<PAGE>   78
 
  NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS IN CONNECTION WITH THE OFFERING
MADE BY THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY HIGHMARK OR
ITS DISTRIBUTOR. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY HIGHMARK OR
BY THE DISTRIBUTOR IN ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY
BE MADE.
 
NOT FDIC INSURED
<PAGE>   79
 
                                [HIGHMARK LOGO]
 
                                 HIGHMARK FUNDS
 
                               TRS-17236(R12/95)
<PAGE>   80
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR
     MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT
     BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR
     THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE
     UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS
     OF ANY SUCH STATE.
 
                             SUBJECT TO COMPLETION
                                 HIGHMARK FUNDS
 
                               MONEY MARKET FUNDS
 
  HighMark Funds ("HighMark") is an open-end, diversified, registered investment
company that offers a convenient means of investing in one or more
professionally managed portfolios of securities. This Prospectus relates to
HighMark's:
                           - Diversified Money Market Fund
                           - U.S. Government Money Market Fund
                           - 100% U.S. Treasury Money Market Fund
                           - California Tax-Free Money Market Fund
 
                                FIDUCIARY SHARES
 
  HighMark's Fiduciary Shares are offered to the following investors: (i)
fiduciary, advisory, agency, custodial and other similar accounts maintained
with Union Bank of California, N.A. or its affiliates; (ii) Select IRA accounts
established with The Bank of California, N.A. and invested in any of HighMark's
Equity or Fixed Income Funds prior to June 20, 1994, which have remained
continuously open thereafter and which are not considered to be fiduciary
accounts; (iii) Shareholders who currently own Shares of HighMark's Equity or
Fixed Income Funds that were purchased prior to June 20, 1994 within an account
registered in their name with the Funds; and (iv) present and retired directors,
officers and employees (and their spouses and children under the age of 21) of
Union Bank of California, N.A., HighMark's current or former distributors or
their respective affiliated companies who currently own Shares of HighMark Funds
which were purchased before April 30, 1997.
 
  This Prospectus sets forth concisely the information about HighMark and the
Funds that a prospective investor should know before investing. Investors are
advised to read this Prospectus and retain it for future reference. A Statement
of Additional Information dated the same date as this Prospectus has been filed
with the Securities and Exchange Commission and is available without charge by
writing the Distributor, SEI Financial Services Company, Oaks, Pennsylvania
19456, or by calling 1-800-433-6884. The Statement of Additional Information is
incorporated into this Prospectus by reference. This Prospectus relates only to
the Fiduciary Shares of the Money Market Funds. Interested persons who wish to
obtain a prospectus for the other Funds of HighMark may contact the Distributor
at the above address and telephone number.
 
    AN INVESTMENT IN THE FUNDS IS NEITHER INSURED NOR GUARANTEED BY THE U.S.
GOVERNMENT. THERE CAN BE NO ASSURANCE THAT THE FUNDS WILL BE ABLE TO MAINTAIN A
                   STABLE NET ASSET VALUE OF $1.00 PER SHARE.
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
HIGHMARK'S SHARES ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK, INCLUDING UNION BANK OF CALIFORNIA, N.A., BANK OF TOKYO-
MITSUBISHI, LIMITED OR ANY OF THEIR AFFILIATES OR CORRESPONDENTS. HIGHMARK'S
SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR
ANY OTHER GOVERNMENT AGENCY. INVESTMENT IN HIGHMARK INVOLVES RISKS, INCLUDING
POSSIBLE LOSS OF THE PRINCIPAL AMOUNT INVESTED.
 
February 26, 1997
Fiduciary Shares
<PAGE>   81
 
                                    SUMMARY
 
HIGHMARK FUNDS ("HighMark") is an open-end, diversified, registered investment
company providing a convenient way to invest in professionally managed
portfolios of securities. The following provides basic information about the
Fiduciary Shares of the Diversified Money Market, U.S. Government Obligations
Money Market, 100% U.S. Treasury Obligations Money Market, and California
Tax-Free Money Market Funds (each a "Fund" and sometimes referred to in this
prospectus as the "Funds.") This summary is qualified in its entirety by
reference to the more detailed information provided elsewhere in the Prospectus
and in the Statement of Additional Information.
 
WHAT ARE THE FUNDS' INVESTMENT OBJECTIVES? The Diversified Money Market Fund,
the U.S. Government Money Market Fund, and the 100% U.S. Treasury Money Market
Fund seek current income with liquidity and stability of principal. The
California Tax-Free Money Market Fund seeks as high a level of current interest
income free from federal income tax and California personal income tax as is
consistent with the preservation of capital and relative stability of principal.
(See "INVESTMENT OBJECTIVES")
 
WHAT ARE THE FUNDS' PERMITTED INVESTMENTS? THE DIVERSIFIED MONEY MARKET FUND
invests in obligations with maturities deemed under SEC rules to be 397 days or
less ("short-term investments") issued or guaranteed by the U.S. Government, its
agencies or instrumentalities, in high-quality short-term obligations issued by
banks and corporations, and in other high-quality rated and unrated short-term
instruments; some of the obligations and short-term instruments in which the
Fund invests may be subject to repurchase agreements. THE U.S. GOVERNMENT MONEY
MARKET FUND invests in short-term obligations issued or guaranteed by the U.S.
Treasury, and additionally invests in obligations issued or guaranteed by
agencies or instrumentalities of the U.S. Government; some of the obligations in
which the Fund invests may be subject to repurchase agreements. THE 100% U.S.
TREASURY MONEY MARKET FUND invests exclusively in direct U.S. Treasury
short-term obligations. THE CALIFORNIA TAX-FREE MONEY MARKET FUND invests
primarily in bonds and notes issued by or on behalf of the State of California
and other states, territories, possessions of the United States, and the
District of Columbia and their respective authorities, agencies,
instrumentalities and political sub-divisions, the interest on which is excluded
from gross income for federal income and California personal income tax purposes
and not treated as a preference item for individuals for purposes of the federal
alternative minimum tax. (See "INVESTMENT POLICIES")
 
WHAT ARE THE RISKS INVOLVED WITH AN INVESTMENT IN THE FUNDS? Each Fund seeks to
maintain a net asset value of $1.00 per share. There can be no assurance that a
Fund will be able to maintain a net asset value of $1.00 per share on a
continuous basis. The California Tax-Free Money Market Fund concentrates its
investments in California municipal securities, and an investment in the Fund
therefore may be riskier than an investment in other types of money market
funds. (See "Risk Factors")
 
ARE MY INVESTMENTS INSURED? HighMark's Shares are not federally insured by the
FDIC or any other government agency. Any guarantee by the U.S. Government, its
agencies or any instrumentalities of the securities in which any Fund invests
guarantees only the payment of principal and interest on the guaranteed
security, and does not guarantee the yield or value of the security or yield or
value of Shares of that Fund.
 
WHO IS THE ADVISOR? Pacific Alliance Capital Management, a division of Union
Bank of California, N.A., serves as the Advisor to HighMark. (See "The Advisor")
 
                                        2
<PAGE>   82
 
WHO IS THE ADMINISTRATOR? SEI Fund Resources serves as the Administrator of
HighMark. (See "The Administrator")
 
WHO IS THE CUSTODIAN? Union Bank of California, N.A. (the "Bank") serves as the
custodian of HighMark's assets. (See "The Custodian")
 
WHO IS THE DISTRIBUTOR? SEI Financial Services Company acts as distributor of
HighMark's Shares. (See "The Distributor")
 
HOW DO I PURCHASE AND REDEEM SHARES? Purchases and redemptions may be made
through the Distributor on days on which both the New York Stock Exchange and
the Federal Reserve wire system are open for business ("Business Days"). The
minimum initial investment is generally $1,000. In order to be effective on the
Business Day received, orders to purchase and redeem must be placed prior to
8:00 a.m., Pacific time (11:00 a.m., Eastern time) for the California Tax-Free
Money Market Fund, prior to 9:00 a.m., Pacific time (12:00 noon, Eastern time)
for the 100% U.S. Treasury Money Market Fund and prior to 10:00 a.m., Pacific
time (1:00 p.m. Eastern time) for the Diversified Money Market and U.S.
Government Money Market Funds on any Business Day. Otherwise, the order will be
effective the next Business Day. In addition, effectiveness of a purchase is
contingent on the Custodian's receipt of Federal funds before 11:00 a.m.,
Pacific time (2:00 p.m., Eastern time). (See "PURCHASE AND REDEMPTION OF
SHARES")
 
HOW ARE DIVIDENDS PAID? The net investment income (exclusive of short-term
capital gains) of the Funds is determined and declared on each Business Day as a
dividend for Shareholders of record as of the close of business on that day.
Dividends are paid monthly in additional shares unless the Shareholder elects to
take the payment in cash. (See "DIVIDENDS")
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
Summary...............................................................................    2
Money Market Funds Fee Table..........................................................    5
Financial Highlights..................................................................    7
Fund Description......................................................................   15
Investment Objectives.................................................................   15
Investment Policies...................................................................   15
  Diversified Money Market Fund.......................................................   16
  U.S. Government Money Market Fund...................................................   17
  The 100% U.S. Treasury Money Market Fund............................................   18
  California Tax-Free Money Market Fund...............................................   18
Municipal Securities..................................................................   20
General...............................................................................   21
  Illiquid and Restricted Securities..................................................   22
  Lending of Portfolio Securities.....................................................   22
  Other Investments...................................................................   22
  Risk Factors........................................................................   23
</TABLE>
 
                                        3
<PAGE>   83
 
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                         --
<S>                                                                                     <C>
Investment Limitations................................................................   24
Purchase and Redemption of Shares.....................................................   26
Exchange Privileges...................................................................   27
Dividends.............................................................................   28
Federal Taxation......................................................................   29
Service Arrangements..................................................................   31
  The Advisor.........................................................................   31
  Administrator.......................................................................   32
  The Transfer Agent..................................................................   33
  Shareholder Service Plan............................................................   33
  Distributor.........................................................................   33
  Banking Laws........................................................................   33
  Custodian...........................................................................   34
General Information...................................................................   34
  Description of HighMark & Its Shares................................................   34
  Performance Information.............................................................   35
  Miscellaneous.......................................................................   36
Description of Permitted Investments..................................................   37
</TABLE>
 
                                        4
<PAGE>   84
 
                          MONEY MARKET FUNDS FEE TABLE
 
<TABLE>
<CAPTION>
                                                                                                100% U.S.      CALIFORNIA
                                                              DIVERSIFIED    U.S. GOVERNMENT     TREASURY       TAX-FREE
                                                              MONEY MARKET    MONEY MARKET     MONEY MARKET   MONEY MARKET
                                                                  FUND            FUND             FUND           FUND
                                                               FIDUCIARY        FIDUCIARY       FIDUCIARY      FIDUCIARY
                                                                 SHARES          SHARES           SHARES         SHARES
                                                              ------------   ---------------   ------------   ------------
<S>                                                           <C>            <C>               <C>            <C>
SHAREHOLDER TRANSACTION EXPENSES(A)
  Maximum Sales Load Imposed on Purchases (as a percentage
    of offering price)......................................         0%               0%              0%             0%
  Maximum Sales Load Imposed on Reinvested Dividends (as a
    percentage of offering price)...........................         0%               0%              0%             0%
  Deferred Sales Load (as a percentage of original purchase
    price or redemption proceeds, as applicable)............         0%               0%              0%             0%
  Redemption Fees (as a percentage of amount redeemed, if
    applicable)(b)..........................................         0%               0%              0%             0%
  Exchange Fee(a)...........................................      $  0            $   0            $  0           $  0
ANNUAL OPERATING EXPENSES (as a percentage of net assets)
  Management Fees (after voluntary reduction)(c)............      0.30%            0.29%           0.24%          0.09%
  12b-1 Fees................................................      0.00%            0.00%           0.00%          0.00%
  Other Expenses (after voluntary reduction)(d).............      0.20%            0.21%           0.21%          0.21%
                                                                  ----             ----            ----           ----
  Total Fund Operating Expenses(e)..........................      0.50%            0.50%           0.45%          0.30%
                                                                  ====             ====            ====           ====
</TABLE>
 
  EXAMPLE:  You would pay the following expenses on a $1,000 investment,
assuming (1) 5% annual return and (2) redemption at the end of each time period.
 
<TABLE>
<CAPTION>
                                                                 1 YEAR   3 YEARS   5 YEARS   10 YEARS
                                                                 ------   -------   -------   --------
<S>                                                              <C>      <C>       <C>       <C>
Diversified Money Market Fund Fiduciary Shares.................    $5       $16       $28       $ 63
U.S. Government Money Market Fund Fiduciary Shares.............    $5       $16       $28       $ 63
100% U.S. Treasury Money Market Fund Fiduciary Shares..........    $5       $14       $25       $ 57
California Tax-Free Money Market Fund Fiduciary Shares.........    $3       $10       $17       $ 38
</TABLE>
 
  The purpose of the tables above is to assist an investor in the Funds in
understanding the various costs and expenses that a Shareholder will bear
directly or indirectly. For a more complete discussion of each Fund's annual
operating expenses, see SERVICE ARRANGEMENTS below. THE FOREGOING EXAMPLE SHOULD
NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE EXPENSES. ACTUAL EXPENSES
MAY BE GREATER OR LESS THAN THOSE SHOWN.
- ---------------
 
(a) Certain entities (including Union Bank of California and its affiliates)
    making investments in the Funds on behalf of their customers may charge
    customers fees for services provided in connection with the investment in,
    redemption of, and exchange of Shares. (See PURCHASE AND REDEMPTION OF
    SHARES, EXCHANGE PRIVILEGES and SERVICE ARRANGEMENTS below.)
 
(b) A wire redemption charge is deducted from the amount of a wire redemption
    payment made at the request of a Shareholder. (See PURCHASE AND REDEMPTION
    OF SHARES below.)
 
                                        5
<PAGE>   85
 
(c) Absent voluntary fee waivers, MANAGEMENT FEES would be 0.30% for the
    Fiduciary Shares of the U.S. Government Money Market Fund, the 100% U.S.
    Treasury Money Market Fund, and the California Tax-Free Money Market Fund.
 
(d) Absent voluntary fee waivers, OTHER EXPENSES would be 0.47% for the
    Fiduciary Shares of the Diversified Money Market Fund, and 0.48% for the
    Fiduciary Shares of each of the U.S. Government Money Market Fund, the 100%
    U.S. Treasury Money Market Fund and the California Tax-Free Money Market
    Fund.
 
(e) Absent voluntary fee waivers, TOTAL FUND OPERATING EXPENSES would be: 0.77%
    for the Fiduciary Shares of the Diversified Money Market Fund, 0.78% for the
    Fiduciary Shares of the U.S. Government Money Market Fund, the 100% U.S.
    Treasury Money Market Fund, and the California Tax-Free Money Market Fund.
 
                                        6
<PAGE>   86
 
                              FINANCIAL HIGHLIGHTS
 
  The tables below set forth certain financial information with respect to the
Fiduciary Shares of the Diversified Money Market Fund, U.S. Government Money
Market Fund, 100% U.S. Treasury Money Market Fund, and California Tax-Free Money
Market Fund. Financial highlights for the Funds for the period ended July 31,
1996 have been derived from financial statements audited by Deloitte & Touche
LLP, independent auditors for HighMark, whose report thereon is included in the
Statement of Additional Information. Prior to the fiscal year ended July 31,
1996, Coopers & Lybrand L.L.P. served as independent accountants for HighMark.
 
                         DIVERSIFIED MONEY MARKET FUND
                    (FORMERLY DIVERSIFIED OBLIGATIONS FUND)
 
<TABLE>
<CAPTION>
                                                                 YEAR ENDED JULY 31,
                                              ---------------------------------------------------------
                                                1996        1995        1994        1993        1992
                                              ---------   ---------   ---------   ---------   ---------
                                              FIDUCIARY   FIDUCIARY   FIDUCIARY   FIDUCIARY   FIDUCIARY
                                              ---------   ---------   ---------   ---------   ---------
<S>                                           <C>         <C>         <C>         <C>         <C>
Net Asset Value, Beginning of Period........  $    1.00   $    1.00   $    1.00   $    1.00   $    1.00
                                               --------    --------    --------    --------    --------
Investment Activities
  Net investment income.....................      0.049       0.049       0.028       0.027       0.043
                                               --------    --------    --------    --------    --------
Distributions
  Net investment income.....................     (0.049)     (0.049)     (0.028)     (0.027)     (0.043)
                                               --------    --------    --------    --------    --------
Net Asset Value, End of Period..............  $    1.00   $    1.00   $    1.00   $    1.00   $    1.00
                                               ========    ========    ========    ========    ========
Total Return................................       5.01%       4.99%       2.88%       2.75%       4.41%
Ratios/Supplementary Data:
  Net Assets at end of period (000).........  $ 244,775   $ 270,476   $ 228,934   $ 254,034   $ 337,485
  Ratio of expenses to average net assets...       0.75%       0.74%       0.74%       0.72%       0.72%
  Ratio of net investment income to average
     net assets.............................       4.91%       4.88%       2.83%       2.72%       4.34%
  Ratio of expenses to average net
     assets*................................       0.99%       0.98%       0.89%       0.73%       0.72%
  Ratio of net investment income to average
     net assets*............................       4.67%       4.64%       2.67%       2.71%       4.34%
</TABLE>
 
                                        7
<PAGE>   87
 
<TABLE>
<CAPTION>
                                                                                          AUGUST 10,
                                                                                           1987 TO
                                                              YEAR ENDED JULY 31,          JULY 31,
                                                        -------------------------------   ----------
                                                          1991        1990       1989      1988(A)
                                                        ---------   --------   --------   ----------
                                                        FIDUCIARY
                                                        ---------
<S>                                                     <C>         <C>        <C>        <C>
Net Asset Value, Beginning of Period..................  $    1.00   $   1.00   $   1.00    $    1.00
Investment Activities
  Net investment income...............................      0.066      0.079      0.085        0.066
Distributions
  Net investment income...............................     (0.066)    (0.079)    (0.085)      (0.066)
                                                         --------   --------   --------     --------
Net Asset Value, End of Period........................  $    1.00   $   1.00   $   1.00    $    1.00
                                                         ========   ========   ========     ========
Total Return..........................................       7.00%      8.23%      8.84%        6.94%
Ratios/Supplementary Data:
  Net Assets at end of period (000)...................  $ 405,447   $593,116   $621,462    $ 350,499
  Ratio of expenses to average net assets.............       0.70%      0.66%      0.59%        0.50%(b)
  Ratio of net investment income to average net
     assets...........................................       6.71%      7.92%      8.50%        6.73%(b)
  Ratio of expenses to average net assets*............       0.70%      0.69%      0.71%        0.70%(b)
  Ratio of net investment income to average net
     assets*..........................................       6.71%      7.89%      8.38%        6.53%(b)
</TABLE>
 
  On December 1, 1990, the Diversified Obligations Fund, now renamed the
Diversified Money Market Fund, commenced offering Class A Shares and designated
existing shares as Class B Shares. As of June 20, 1994, Class A and Class B
Shares were designated as "Investor" (now called "Retail") and "Fiduciary"
Shares, respectively.

- ---------------
 
 *  During each period the investment advisory, administration and distribution
    fees (Retail Shares) were voluntarily reduced. If such voluntary fee
    reductions had not occurred, the ratios would have been as indicated.

(a) Period from commencement of operations.
   
(b) Annualized.
 
                                        8
<PAGE>   88
 
                       U.S. GOVERNMENT MONEY MARKET FUND
                  (FORMERLY U.S. GOVERNMENT OBLIGATIONS FUND)
 
<TABLE>
<CAPTION>
                                                              YEAR ENDED JULY 31,
                                       -----------------------------------------------------------------
                                         1996          1995          1994          1993          1992
                                       ---------     ---------     ---------     ---------     ---------
                                       FIDUCIARY     FIDUCIARY     FIDUCIARY     FIDUCIARY     FIDUCIARY
                                       ---------     ---------     ---------     ---------     ---------
<S>                                    <C>           <C>           <C>           <C>           <C>
Net Asset Value, Beginning of
  Period.............................  $    1.00     $    1.00     $    1.00     $    1.00      $   1.00
                                        --------      --------      --------      --------       -------
Investment Activities
  Net investment income..............      0.048         0.048         0.027         0.027         0.042
                                        --------      --------      --------      --------       -------
Distributions
  Net investment income..............     (0.048)       (0.048)       (0.027)       (0.027)       (0.042)
                                        --------      --------      --------      --------       -------
Net Asset Value, End of Period.......  $    1.00     $    1.00     $    1.00     $    1.00      $   1.00
                                        ========      ========      ========      ========       =======
Total Return.........................       4.88%         4.87%         2.74%         2.72%         4.25%
Ratios/Supplementary Data:
  Net Assets at end of period
     (000)...........................  $ 151,483     $ 159,747     $ 162,094     $ 166,182      $ 94,252
  Ratio of expenses to average net
     assets..........................       0.77%         0.78%         0.78%         0.71%         0.73%
  Ratio of net investment income to
     average net assets..............       4.76%         4.76%         2.70%         2.67%         4.15%
  Ratio of expenses to average net
     assets*.........................       1.00%         1.02%         0.94%         0.74%         0.74%
  Ratio of net investment income to
     average net assets*.............       4.53%         4.52%         2.54%         2.65%         4.14%
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                          AUGUST 10,
                                                                                           1987 TO
                                                          YEAR ENDED JULY 31,              JULY 31,
                                                   ----------------------------------     ----------
                                                                  1990         1989        1988(A)
                                                                 -------     --------     ----------
                                                     1991
                                                   ---------
                                                   FIDUCIARY
                                                   ---------
<S>                                                <C>           <C>         <C>          <C>
Net Asset Value, Beginning of Period.............  $    1.00     $  1.00     $   1.00      $    1.00
Investment Activities
  Net investment income..........................      0.063       0.078        0.083          0.064
                                                    --------     -------     --------       --------
Distributions
  Net investment income..........................     (0.063)     (0.078)      (0.083)        (0.064)
                                                    --------     -------     --------       --------
Net Asset Value, End of Period...................  $    1.00     $  1.00     $   1.00      $    1.00
                                                    ========     =======     ========       ========
Total Return.....................................       6.49%       8.09%        8.62%          6.78%
Ratios/Supplementary Data:
  Net Assets at end of period (000)..............  $ 103,725     $80,774     $114,945      $ 131,985
  Ratio of expenses to average net assets........       0.63%       0.65%        0.62%          0.42%(b)
  Ratio of net investment income to average net
     assets......................................       6.29%       7.80%        8.30%          6.59%(b)
  Ratio of expenses to average net assets*.......       0.73%       0.72%        0.75%          0.71%(b)
  Ratio of net investment income to average net
     assets*.....................................       6.19%       7.73%        8.17%          6.30%(b)
</TABLE>
 
                                        9
<PAGE>   89
 
  On December 1, 1990, the U.S. Government Obligations Fund (now renamed the
U.S. Government Money Market Fund) commenced offering Class A Shares and
designated existing shares as Class B Shares. As of June 20, 1994, Class A and
Class B Shares were designated as "Investor" (now called "Retail") and
"Fiduciary" Shares, respectively.
- ---------------
 
*    During each period the investment advisory, administration and distribution
     fees (Retail Shares) were voluntarily reduced. If such voluntary fee
     reductions had not occurred, the ratios would have been as indicated.

(a)  Period from commencement of operations.

(b)   Annualized.
 
                                       10
<PAGE>   90
 
                      100% U.S. TREASURY MONEY MARKET FUND
                 (FORMERLY 100% U.S. TREASURY OBLIGATIONS FUND)
 
<TABLE>
<CAPTION>
                                                                 YEAR ENDED JULY 31,
                                              ---------------------------------------------------------
                                                1996        1995        1994        1993        1992
                                              ---------   ---------   ---------   ---------   ---------
                                              FIDUCIARY   FIDUCIARY   FIDUCIARY   FIDUCIARY   FIDUCIARY
                                              ---------   ---------   ---------   ---------   ---------
<S>                                           <C>         <C>         <C>         <C>         <C>
Net Asset Value, Beginning of Period........  $    1.00   $    1.00   $    1.00   $    1.00   $    1.00
                                               --------    --------    --------    --------    --------
Investment Activities
Net investment income.......................      0.046       0.046       0.026       0.026       0.040
Net realized and unrealized gains on
  investments...............................                                                      0.001
                                               --------    --------    --------    --------    --------
          Total from Investment
            Activities......................      0.046       0.046       0.026       0.026       0.041
                                               --------    --------    --------    --------    --------
Distributions
  Net investment income.....................     (0.046)     (0.046)     (0.026)     (0.026)     (0.040)
Net realized gains..........................                                                     (0.001)
                                               --------    --------    --------    --------    --------
          Total Distributions...............     (0.046)     (0.046)     (0.026)     (0.026)     (0.041)
                                               --------    --------    --------    --------    --------
Net Asset Value, End of Period..............  $    1.00   $    1.00   $    1.00   $    1.00   $    1.00
                                               ========    ========    ========    ========    ========
Total Return................................       4.74%       4.69%       2.68%       2.64%       4.18%
Ratios/Supplementary Data:
  Net Assets at end of period (000).........  $ 173,340   $ 190,604   $ 160,721   $ 191,946   $ 219,451
  Ratio of expenses to average net assets...       0.74%       0.73%       0.74%       0.67%       0.65%
  Ratio of net investment income to average
     net assets.............................       4.64%       4.60%       2.63%       2.60%       3.99%
  Ratio of expenses to average net
     assets*................................       0.97%       0.97%       0.90%       0.72%       0.72%
  Ratio of net investment income average net
     assets*................................       4.41%       4.36%       2.48%       2.55%       3.92%
</TABLE>
 
                                       11
<PAGE>   91
 
<TABLE>
<CAPTION>
                                                                                        AUGUST 10,
                                                                                         1987 TO
                                                          YEAR ENDED JULY 31,            JULY 31,
                                                   ---------------------------------    ----------
                                                     1991         1990        1989       1988(A)
                                                   ---------    --------    --------    ----------
                                                   FIDUCIARY
                                                   ---------
<S>                                                <C>          <C>         <C>         <C>
Net Asset Value, Beginning of Period.............  $    1.00    $   1.00    $   1.00    $     1.00
Investment Activities
  Net investment income..........................      0.063       0.078       0.081         0.063
                                                    --------    --------    --------      --------
Distributions
  Net investment income..........................     (0.063)     (0.078)     (0.081)       (0.063)
                                                    --------    --------    --------      --------
Net Asset Value, End of Period...................  $    1.00    $   1.00    $   1.00    $     1.00
                                                    ========    ========    ========      ========
Total Return.....................................      6.53%       8.04%       8.43%         6.62%
Ratios/Supplementary Data:
  Net Assets at end of period (000)..............  $ 265,528    $205,787    $174,258    $  151,854
  Ratio of expenses to average net assets........       0.62%       0.65%       0.54%         0.41%(b)
  Ratio of net investment income to average net
     assets......................................       6.25%       7.76%       8.12%         6.45%(b)
  Ratio of expenses to average net assets*.......       0.70%       0.71%       0.72%         0.72%(b)
  Ratio of net investment income average net
     assets*.....................................       6.17%       7.70%       7.94%         6.14%(b)
</TABLE>
 
  On December 1, 1990, the 100% U.S. Treasury Obligations Fund (now renamed the
100% U.S. Treasury Money Market Fund) commenced offering Class A Shares and
designated existing shares as Class B Shares. As of June 20, 1994, Class A and
Class B Shares were designated as "Investor" (now called "Retail") and
"Fiduciary" Shares, respectively.
- ---------------
 
*   During each period the investment advisory, administration and distribution
    fees (Retail Shares) were voluntarily reduced. If such voluntary fee
    reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Annualized.
 
                                       12
<PAGE>   92
 
                     CALIFORNIA TAX-FREE MONEY MARKET FUND
                      (FORMERLY CALIFORNIA TAX-FREE FUND)
 
<TABLE>
<CAPTION>
                                                                  YEAR ENDED JULY 31,
                                               ---------------------------------------------------------
                                                 1996        1995        1994        1993        1992
                                               ---------   ---------   ---------   ---------   ---------
                                               FIDUCIARY   FIDUCIARY   FIDUCIARY   FIDUCIARY   FIDUCIARY
                                               ---------   ---------   ---------   ---------   ---------
<S>                                            <C>         <C>         <C>         <C>         <C>
Net Asset Value, Beginning of Period.........   $   1.00   $    1.00   $    1.00   $    1.00   $    1.00
Investment Activities
  Net investment income......................      0.029       0.031       0.020       0.021       0.032
                                                 -------    --------    --------    --------    --------
Distributions
  Net Investment income......................    (0.029)     (0.031)     (0.020)     (0.021)     (0.032)
                                                 -------    --------    --------    --------    --------
Net Asset Value, End of Period...............   $   1.00   $    1.00   $    1.00   $    1.00   $    1.00
                                                 =======    ========    ========    ========    ========
Total Return.................................       2.91%       3.16%       1.99%       2.13%       3.20%
Ratios/Supplementary Data:
  Net Assets at end of period (000)..........   $ 98,352   $ 105,742   $ 114,993   $ 142,939   $ 116,062
  Ratio of expenses to average net assets....       0.55%       0.50%       0.50%       0.44%       0.54%
  Ratio of net investment income to average
     net assets..............................       2.88%       3.11%       1.96%       2.08%       3.15%
  Ratio of expenses to average net assets*...       1.00%       1.01%       0.93%       0.73%       0.74%
  Ratio of net investment income to average
     net assets*.............................       2.43%       2.60%       1.53%       1.78%       2.95%
</TABLE>
 
                                       13
<PAGE>   93
 
<TABLE>
<CAPTION>
                                                                                    AUGUST 10,
                                                                                     1987 TO
                                                    YEAR ENDED JULY 31,              JULY 31,
                                            -----------------------------------     ----------
                                              1991          1990         1989        1988(A)
                                            ---------     --------     --------     ----------
                                            FIDUCIARY
                                            ---------
<S>                                         <C>           <C>          <C>          <C>
Net Asset Value, Beginning of Period......  $    1.00     $   1.00     $   1.00      $   1.00
                                             --------     --------     --------      --------
Investment Activities
  Net investment income...................      0.045        0.052        0.054         0.042
                                             --------     --------     --------      --------
Distributions
  Net Investment income...................     (0.045)      (0.052)      (0.054)       (0.042)
                                             --------     --------     --------      --------
Net Asset Value, End of Period............  $    1.00     $   1.00     $   1.00      $   1.00
                                             ========     ========     ========      ========
Total Return..............................       4.57%        5.28%        5.58%         4.41%
Ratios/Supplementary Data:
  Net Assets at end of period (000).......  $ 142,365     $137,308     $147,868      $121,940
  Ratio of expenses to average net
     assets...............................       0.53%        0.66%        0.71%         0.70%(b)
  Ratio of net investment income to
     average net assets...................       4.47%        5.17%        5.45%         4.34%(b)
  Ratio of expenses to average net
     assets*..............................       0.72%        0.72%        0.76%         0.75%(b)
  Ratio of net investment income to
     average net assets*..................       4.28%        5.11%        5.40%         4.29%(b)
</TABLE>
 
  On December 1, 1990, the California Tax-Free Fund (now renamed the California
Tax-Free Money Market Fund) commenced offering Class A Shares and designated
existing shares as Class B Shares. As of June 20, 1994, Class A and Class B
Shares were designated as "Investor" (now called "Retail") and "Fiduciary"
Shares, respectively.
- ---------------
 
 *  During each period the investment advisory, administration and distribution
    fees (Retail Shares) were voluntarily reduced. If such voluntary fee
    reductions had not occurred, the ratios would have been as indicated.
(a) Period from commencement of operations.
(b) Annualized.
 
                                       14
<PAGE>   94
 
FUND
DESCRIPTION             HighMark Funds ("HighMark") is an open-end, diversified,
                      registered investment company that currently offers units
                      of beneficial interest ("Shares") in sixteen separate
                      investment portfolios ("Funds"). All of the Funds are
                      advised by Pacific Alliance Capital Management (the
                      "Advisor"), a division of Union Bank of California, N.A.
                      Shareholders may purchase Shares of selected Funds through
                      two separate classes (the "Retail" and "Fiduciary"
                      classes). These classes may have different sales charges
                      and other expenses, which may affect performance.
                      Information regarding HighMark's other Funds and other
                      classes is contained in separate prospectuses that may be
                      obtained from HighMark's Distributor, SEI Financial
                      Services Company, at Oaks, Pennsylvania 19456, or by
                      calling 1-800-433-6884.
 
                        For information concerning those investors who qualify
                      to purchase Fiduciary Shares, see PURCHASE AND REDEMPTION
                      OF SHARES below. (Fiduciary Shares may be hereinafter
                      referred to as "Shares.")
 
INVESTMENT
OBJECTIVES              The investment objectives of the Funds are as follows:
 
                        The Diversified Money Market Fund, the U.S. Government
                      Money Market Fund and the 100% U.S. Treasury Money Market
                      Fund each seek current income with liquidity and stability
                      of principal.
 
                        The California Tax-Free Money Market Fund seeks as high
                      a level of current interest income free from federal
                      income tax and California personal income tax as is
                      consistent with the preservation of capital and relative
                      stability of principal.
 
                        The investment objectives and certain of the investment
                      limitations of the Diversified Money Market Fund, the U.S.
                      Government Money Market Fund, the 100% U.S. Treasury Money
                      Market Fund, and the California Tax-Free Money Market Fund
                      may not be changed without a vote of the holders of a
                      majority of the outstanding Shares of the respective Fund
                      (as defined under GENERAL INFORMATION--Miscellaneous
                      below). There can be no assurance that a Fund will achieve
                      its investment objective.
 
INVESTMENT
POLICIES                While the Diversified Money Market Fund, the U.S.
                      Government Money Market Fund and the 100% U.S. Treasury
                      Money Market Fund have the same investment objective, they
                      differ as follows with respect to the types of instruments
                      that may be purchased. Each Fund may invest only in U.S.
                      dollar denominated obligations determined by the Advisor
                      to present minimal credit risks under guidelines adopted
                      by HighMark's Board of Trustees.
 
                                       15
<PAGE>   95
 
                      Diversified Money Market Fund
 
                      The Diversified Money Market Fund may invest in the
                      following obligations:
 
                        (i) obligations issued by the U.S. Government, and
                      backed by its full faith and credit, and obligations
                      issued or guaranteed as to principal and interest by the
                      agencies or instrumentalities of the U.S. Government
                      (e.g., obligations issued by Farmers Home Administration,
                      Government National Mortgage Association, Federal Farm
                      Credit Bank and Federal Housing Administration);
 
                        (ii) obligations such as bankers' acceptances, bank
                      notes, certificates of deposit and time deposits of thrift
                      institutions, savings and loans, U.S. commercial banks
                      (including foreign branches of such banks), and U.S. and
                      foreign branches of foreign banks, provided that such
                      institutions (or, in the case of a branch, the parent
                      institution) have total assets of $1 billion or more as
                      shown on their last published financial statements at the
                      time of investment;
 
                        (iii) short-term promissory notes issued by
                      corporations, including Canadian Commercial Paper ("CCP"),
                      which is U.S. dollar denominated commercial paper issued
                      by a Canadian corporation or a Canadian counterpart of a
                      U.S. corporation, and Europaper, which is U.S. dollar
                      denominated commercial paper of a foreign issuer;
 
                        (iv) U.S. dollar denominated securities issued or
                      guaranteed by foreign governments, their political
                      subdivisions, agencies or instrumentalities, and
                      obligations of supranational entities such as the World
                      Bank and the Asian Development Bank (provided that the
                      Fund invests no more than 5% of its assets in any such
                      instrument and invests no more than 25% of its assets in
                      such instruments in the aggregate);
 
                        (v) up to 5% of its total assets in loan participations
                      issued by a bank in the U.S. with assets exceeding $1
                      billion where the underlying loan is made to a borrower in
                      whose obligations the Fund may invest and the underlying
                      loan has a remaining maturity of 397 days or less;
 
                        (vi) readily-marketable, short-term debt securities
                      including, but not limited to, those backed by company
                      receivables, truck and auto loans, leases, and credit card
                      loans;
 
                        (vii) Treasury receipts, including TRs, TIGRs and CATs;
                      and
 
                        (viii) repurchase agreements involving such obligations.
 
                        Certain of the obligations in which the Fund may invest
                      may be variable or floating rate instruments, may involve
                      a conditional or unconditional demand feature, and may
                      include variable amount master demand notes.
 
                                       16
<PAGE>   96
 
                        Subject to the provisions of Rule 2a-7 under the
                      Investment Company Act of 1940 (the "1940 Act"),
                      investments of the Diversified Money Market Fund will
                      consist of those obligations that, at the time of
                      purchase, possess the highest short-term rating from at
                      least one nationally recognized statistical rating
                      organization ("NRSRO") (for example, commercial paper
                      rated "A-1" by Standard & Poor's Corporation ("S&P") or
                      "P-1" by Moody's Investors Service, Inc. ("Moody's")).
                      Although the Diversified Money Market Fund does not
                      presently expect to do so, it may also invest up to 5% of
                      its net assets in obligations that, at the time of
                      purchase, possess one of the two highest short-term
                      ratings from at least one NRSRO, and in obligations that
                      do not possess an equivalent short-term rating (i.e., are
                      unrated) but are determined by the Advisor to be of
                      comparable quality to the rated instruments eligible for
                      purchase by the Fund under guidelines adopted by the Board
                      of Trustees.
 
                        The Diversified Money Market Fund will not invest more
                      than 5% of its total assets in the securities of any one
                      first tier issuer, except that the Fund may invest up to
                      25% of its total assets in the securities of a single
                      first tier issuer for a period of up to three business
                      days. There is no limit on the percentage of the Fund's
                      assets that may be invested in obligations issued or
                      guaranteed by the U.S. Government, its agencies, or
                      instrumentalities and repurchase agreements fully
                      collateralized by such obligations.
 
                        The Fund may concentrate its investments in certain
                      instruments issued by U.S. Banks, U.S. branches of foreign
                      banks, and foreign branches of U.S. banks, but only so
                      long as the investment risk associated with investing in
                      foreign branches of U.S. banks is the same as that
                      associated with investing in instruments issued by the
                      U.S. parent. Domestic certificates of deposit and bankers'
                      acceptances include those issued by domestic branches of a
                      foreign bank to the extent permitted by the rules of the
                      Securities and Exchange Commission. The rules currently
                      permit U.S. branches of foreign banks to be treated as a
                      domestic bank if it can be demonstrated that they are
                      subject to the same regulations as domestic banks.
 
                      U.S. Government Money Market Fund
 
                        As a fundamental policy, the U.S. Government Money
                      Market Fund may not purchase securities other than U.S.
                      Treasury bills, notes, and other obligations issued or
                      guaranteed by the U.S. Government, its agencies, or
                      instrumentalities (such as obligations issued by the
                      Government National Mortgage Association and the
                      Export-Import Bank of the United States) some of which may
                      be subject to repurchase agreements.
 
                                       17
<PAGE>   97
 
                      The 100% U.S. Treasury Money Market Fund
 
                        The 100% U.S. Treasury Money Market Fund invests
                      exclusively in direct U.S. Treasury obligations and
                      separately traded component parts of such obligations
                      transferable through the Federal Reserve book-entry system
                      ("STRIPs").
 
                      California Tax-Free Money Market Fund
 
                          The California Tax-Free Money Market Fund invests in
                      obligations issued by the State of California and its
                      political subdivisions or municipal authorities and
                      obligations issued by territories or possessions of the
                      United States ("Municipal Securities").
 
                        Under normal market conditions and, as a matter of
                      fundamental policy, at least 80% of the value of the total
                      assets of the California Tax-Free Money Market Fund will
                      be invested in Municipal Securities, the interest on
                      which, in the opinion of bond counsel, is both excluded
                      from gross income both for federal income tax purposes and
                      for California personal income tax purposes, and does not
                      constitute a preference item for individuals for purposes
                      of the federal alternative minimum tax.
 
                        Certain of the obligations in which the Fund may invest
                      may be variable or floating rate instruments and may
                      involve a conditional or unconditional demand feature.
 
                        Under normal market conditions, up to 20% of the
                      California Tax-Free Money Market Fund's total assets may
                      be invested in short-term obligations, the interest on
                      which is treated as a preference item for individuals for
                      purposes of the federal alternative minimum tax or subject
                      to federal or California personal income tax ("Taxable
                      Obligations"). These short-term obligations may include
                      bonds from other states and cash equivalents as described
                      below.
 
                        Dividends paid by the California Tax-Free Money Market
                      Fund that are derived from obligations, the interest on
                      which is exempt from California taxation when received by
                      an individual ("California Exempt-Interest Securities"),
                      are excluded from gross income for California personal
                      income tax purposes. Dividends derived from interest on
                      obligations other than California Exempt-Interest
                      Securities may be excluded from gross income for federal
                      income tax purposes but will be subject to California
                      personal income tax.
 
                        In order for the California Tax-Free Money Market Fund
                      to pay exempt-interest dividends, at least 50% of its
                      total assets must be invested in California
                      Exempt-Interest Securities at the close of each quarter of
                      its taxable year. Dividends, regardless of their source,
                      may be subject to local taxes.
 
                                       18
<PAGE>   98
 
                        In seeking to achieve its investment objective, the
                      California Tax-Free Money Market Fund may invest all or
                      any part of its assets in Municipal Securities that are
                      private activity bonds, including those known as
                      industrial development bonds under prior federal law. (Any
                      reference herein to private activity bonds includes
                      industrial development bonds.) Interest on private
                      activity bonds is excluded from gross income for federal
                      income tax purposes only if the bonds fall within certain
                      defined categories of qualified private activity bonds and
                      meet the requirements specified for those respective
                      categories. However, even if the California Tax-Free Money
                      Market Fund invests in private activity bonds that fall
                      within these categories, Shareholders may become subject
                      to the federal alternative minimum tax on that part of
                      such Fund's distributions derived from interest on such
                      bonds. For further information, see FEDERAL TAXATION
                      below.
 
                        The California Tax-Free Money Market Fund may invest up
                      to 10% of its total assets in shares of other investment
                      companies with like investment objectives. As a
                      shareholder of an investment company, a Fund may
                      indirectly bear investment management fees of that
                      investment company, which are in addition to the
                      management fees the Fund pays its own advisor.
 
                        Investments of the California Tax-Free Money Market Fund
                      will consist of those obligations that, at the time of
                      purchase, possess one of the two highest short-term
                      ratings by a NRSRO, and in obligations that do not possess
                      a rating (i.e., are unrated) but are determined by the
                      Advisor to be of comparable quality to the rated
                      instruments eligible for purchase by the Fund under the
                      guidelines adopted by the Board of Trustees.
 
                        The California Tax-Free Money Market Fund may hold
                      uninvested cash reserves pending investment during
                      temporary "defensive" periods or if, in the opinion of the
                      Advisor, desirable tax-exempt obligations are unavailable.
                      In accordance with the Fund's investment objective and
                      subject to its fundamental policies, investments may be
                      made in Taxable Obligations if, for example, suitable
                      tax-exempt obligations are unavailable or if acquisition
                      of U.S. Government or other taxable securities is deemed
                      appropriate for temporary "defensive" purposes.
 
                        As discussed in greater detail in the Statement of
                      Additional Information, Taxable Obligations may include
                      obligations issued or guaranteed by the U.S. Government,
                      its agencies, or instrumentalities (some of which may be
                      subject to repurchase agreements), certificates of
                      deposit, bankers' acceptances, and commercial paper. As
                      noted above, Taxable Obligations may also include private
                      activity bonds depending on their tax treatment.
 
                        The California Tax-Free Money Market Fund is not
                      intended to constitute a balanced investment program and
                      is not designed for investors seeking capital
 
                                       19
<PAGE>   99
 
                      appreciation nor maximum tax-exempt income irrespective of
                      fluctuations in principal. Investment in the California
                      Tax-Free Money Market Fund would not be appropriate for
                      tax-deferred plans, such as IRA and Keogh plans, and
                      investors should consult a tax or other financial advisor
                      to determine whether investment in the California Tax-Free
                      Fund would be appropriate for them.
 
MUNICIPAL
SECURITIES              The two principal classifications of Municipal
                      Securities that may be held by the California Tax-Free
                      Money Market Fund are "general obligation" securities and
                      "revenue" securities.
 
                        General obligation securities are secured by the
                      issuer's pledge of its full faith and credit and general
                      taxing power for the payment of principal and interest.
 
                        Revenue securities are payable only from the revenues
                      derived from a particular facility or class of facilities
                      or, in some cases, from the proceeds of a special excise
                      tax or other specific revenue source such as the user of
                      the facility being financed. Private activity bonds held
                      by the California Tax-Free Money Market Fund are in most
                      cases revenue securities and are not payable from the
                      unrestricted revenues of the issuer. Consequently, the
                      credit quality of private activity bonds is usually
                      directly related to the credit standing of the corporate
                      user of the facility involved.
 
                        In addition, Municipal Securities may include "moral
                      obligation" bonds, which are normally issued by special
                      purpose public authorities. If the issuer of moral
                      obligation bonds is unable to meet its debt service
                      obligations from current revenues, it may draw on a
                      reserve fund, the restoration of which is a moral
                      commitment but not a legal obligation of the state or
                      municipality which created the issuer.
 
                        Opinions relating to the validity of Municipal
                      Securities and to the exemption of interest thereon from
                      federal income tax or California personal income tax are
                      rendered at the time of issuance by counsel experienced in
                      matters relating to the validity of and tax exemption of
                      interest on bonds issued by states and their political
                      sub-divisions. Neither the California Tax-Free Money
                      Market Fund nor the Advisor will review the proceedings
                      relating to the issuance of Municipal Securities or the
                      basis for such opinions.
 
                        Municipal Securities purchased by the California
                      Tax-Free Money Market Fund may include adjustable rate
                      tax-exempt notes which may have a stated maturity in
                      excess of 397 days, but which will be subject to a demand
                      feature that will permit the Fund to demand payment of the
                      principal of the note either (i) at any time upon not more
                      than thirty days' notice or (ii) at specified intervals
                      not exceeding 397 days and upon no more than thirty days'
                      notice. There may be no active secondary market with
                      respect to a particular adjustable rate note.
 
                                       20
<PAGE>   100
 
                      Nevertheless, as described in greater detail in the
                      Statement of Additional Information, the adjustable
                      interest rate feature included in this type of note is
                      intended generally to assure that the value of the note to
                      the Fund will approximate its par value.
 
                        Municipal Securities may include, but are not limited
                      to, short-term anticipation notes, bond anticipation
                      notes, revenue anticipation notes, and other forms of
                      short-term tax-exempt securities. These instruments are
                      issued in anticipation of the receipt of tax funds, the
                      proceeds of bond placements, or other revenues. In
                      addition, the California Tax-Free Money Market Fund may
                      purchase tax-exempt commercial paper. Under certain
                      circumstances, and subject to the limitations described in
                      the Statement of Additional Information, the California
                      Tax-Free Money Market Fund may invest indirectly in
                      Municipal Securities by purchasing shares of other
                      tax-exempt money market mutual funds.
 
                        The California Tax-Free Money Market Fund may also
                      acquire Municipal Securities that have "put" features.
                      Under a put feature, the Fund has the right to sell the
                      Municipal Security within a specified period of time at a
                      specified price. The put feature cannot be sold,
                      transferred, or assigned separately from the Municipal
                      Security. Each Fund may buy Municipal Securities with put
                      features to facilitate portfolio liquidity, shorten the
                      maturity of the underlying Municipal Securities, or permit
                      investment at a more favorable rate of return. The
                      aggregate price of a security subject to a put may be
                      higher than the price that otherwise would be paid for the
                      security without such a feature, thereby increasing the
                      security's cost and reducing its yield.
 
GENERAL                 The Funds intend to comply with Rule 2a-7 under the 1940
                      Act. Shares of each Fund are priced pursuant to the
                      amortized cost method whereby HighMark seeks to maintain
                      each Fund's net asset value per Share at $1.00. There can
                      be, however, no assurance that a stable net asset value of
                      $1.00 per Share will be maintained.
 
                        Securities or instruments in which each Fund invests
                      have remaining maturities of 397 days or less, although
                      instruments subject to repurchase agreements and certain
                      adjustable rate instruments may bear longer maturities.
                      The dollar-weighted average portfolio maturity of each
                      Fund will not exceed 90 days.
 
                        Although the Diversified Money Market Fund, the U.S.
                      Government Money Market Fund and the 100% U.S. Treasury
                      Money Market Fund have the same investment advisor and the
                      same investment objective, particular securities held and
                      respective yields of these Funds may differ due to
                      differences in the types of permitted investments, cash
                      flow, and the availability of particular investments.
 
                                       21
<PAGE>   101
 
                        Additional information concerning each Fund's
                      investments, including certain investment restrictions
                      that may not be changed with respect to a particular Fund
                      without a vote of the holders of a majority of the
                      outstanding Shares of that Fund, is set forth below and in
                      the Statement of Additional Information. For further
                      information concerning the rating and other requirements
                      governing the investments (including the treatment of
                      securities subject to a tender or demand feature or deemed
                      to possess a rating based on comparable rated securities
                      of the same issuer) of a Fund, see the Statement of
                      Additional Information. The Statement of Additional
                      Information also identifies the NRSROs that may be
                      utilized by the Advisor with respect to portfolio
                      investments for the Funds and provides a description of
                      the relevant ratings assigned by each such NRSRO.
 
                        In the event that a security owned by a Fund is
                      downgraded below the stated rating categories, the Advisor
                      will take appropriate action with regard to that security.
 
                      Illiquid and Restricted Securities
 
                        The Funds shall limit investments in illiquid securities
                      to 10% or less of their net assets. Generally, an
                      "illiquid security" is any security that cannot be
                      disposed of promptly and in the ordinary course of
                      business at approximately the amount at which the Fund has
                      valued the instrument. The absence of a trading market can
                      make it difficult to ascertain the market value of
                      illiquid securities. Each Fund may purchase restricted
                      securities which have not been registered under the
                      Securities Act of 1933 (e.g., Rule 144A Securities and
                      Section 4(2) commercial paper) subject to policies
                      approved by the Board of Trustees. See INVESTMENT
                      RESTRICTIONS in the Statement of Additional Information.
 
                        Time deposits, including ETDs and CTDs but not including
                      certificates of deposit and repurchase agreements, which
                      have maturities in excess of seven days are considered to
                      be illiquid.
 
                      Lending of Portfolio Securities
 
                        In order to generate additional income, each Fund
                      (except the California Tax-Free Money Market Fund) may
                      lend its portfolio securities to broker-dealers, banks or
                      other institutions. A Fund may lend portfolio securities
                      in an amount representing up to 33 1/3% of the value of
                      the Fund's total assets.
 
                      Other Investments
 
                        The Diversified Money Market Fund, the U.S. Government
                      Money Market Fund, and the California Tax-Free Money
                      Market Fund may enter into repurchase agreements and
                      reverse repurchase agreements. Each Fund intends to limit
                      its respective activity in reverse repurchase agreements
                      to no more than 10% of the Fund's total assets.
 
                                       22
<PAGE>   102
 
                        The Funds may enter into forward commitments or purchase
                      securities on a "when-issued" basis. Each Fund expects
                      that commitments by a Fund to enter into forward
                      commitments or purchase when-issued securities will not
                      exceed 25% of the value of the Fund's total assets under
                      normal market conditions. The Funds do not intend to
                      purchase when-issued securities or enter into forward
                      commitments for speculative or leveraging purposes but
                      only for the purpose of acquiring portfolio securities.
 
                        For further information, see "DESCRIPTION OF PERMITTED
                      INVESTMENTS."
 
                      Risk Factors
 
                        Investments by the Funds in obligations of certain
                      agencies and instrumentalities of the U.S. Government may
                      not be guaranteed by the full faith and credit of the U.S.
                      Treasury, and there can be no assurance that the U.S.
                      Government would provide financial support to U.S.
                      Government-sponsored agencies or instrumentalities if it
                      is not obligated to do so by law.
 
                        As in the case of mortgage-related securities,
                      participations and certain asset-backed securities are
                      subject to prepayments and there can be no assurance that
                      the Diversified Money Market Fund will be able to reinvest
                      the proceeds of any prepayment at the same interest rate
                      or on the same terms as the original investment.
 
                        With regard to loan participations, although a Fund's
                      ability to receive payments of principal and interest in
                      connection with a particular loan is primarily dependent
                      on the financial condition of the underlying borrower, the
                      lending institution or bank may provide assistance in
                      collecting interest and principal from the borrower and in
                      enforcing its rights against the borrower in the event of
                      a default. In selecting loan participations on behalf of a
                      Fund, the Advisor will evaluate the creditworthiness of
                      both the borrower and the loan originator and will treat
                      both as an "issuer" of the loan participation for purposes
                      of the Fund's investment policies and restrictions (see
                      INVESTMENT RESTRICTIONS in the Statement of Additional
                      Information).
 
                        Foreign securities which the Diversified Money Market
                      Fund may purchase may subject the Fund to investment risks
                      that differ in some respects from those related to
                      investments in obligations of U.S. issuers. These risks
                      include adverse political and economic developments,
                      possible imposition of withholding taxes on interest
                      income, possible seizure, nationalization, or
                      expropriation of foreign investments, possible
                      establishment of exchange controls, or adoption of other
                      foreign governmental restrictions which might adversely
                      affect the payment of principal and interest on such
                      obligations. In addition, foreign branches of U.S. banks
                      and foreign banks may be subject to less stringent reserve
                      requirements and
 
                                       23
<PAGE>   103
 
                      different accounting, auditing, reporting, and
                      recordkeeping standards than those applicable to domestic
                      branches of U.S. banks.
 
                        Certain risks are inherent in the California Tax-Free
                      Money Market Fund's concentrated investment in California
                      Municipal Securities, which may make an investment in the
                      Fund riskier than an investment in other types of money
                      market funds. Because of the California Tax-Free Money
                      Market Fund's investment objective, many of the securities
                      in its portfolio are likely to be obligations of
                      California governmental issuers that rely in whole or in
                      part, directly or indirectly, on real property taxes as a
                      source of revenue. The ability of the State of California
                      and its political sub-divisions to generate revenue
                      through real property and other taxes and to increase
                      spending has been significantly restricted by various
                      constitutional and statutory amendments and voter-passed
                      initiatives. Such limitations could affect the ability of
                      California state and municipal issuers to pay interest or
                      repay principal on their obligations. In addition, during
                      the first half of the decade, California faced severe
                      economic and fiscal conditions and experienced recurring
                      budget deficits that caused it to deplete its available
                      cash resources and to become increasingly dependent upon
                      external borrowings to meet its cash needs.
 
                        The financial difficulties experienced by the State of
                      California and other issuers of California Municipal
                      Securities during the recession resulted in the credit
                      ratings of certain of their obligations being downgraded
                      significantly by the major rating agencies.
 
                        A more detailed description of special factors affecting
                      investments in obligations of California governmental
                      issuers of which investors should be aware is set forth in
                      the Statement of Additional Information.
 
INVESTMENT
LIMITATIONS             The Diversified Money Market Fund, the U.S. Government
                      Money Market Fund and the 100% U.S. Treasury Money Market
                      Fund may not:
 
                        1) Purchase securities of any one issuer, other than
                      obligations issued or guaranteed by the U.S. Government,
                      its agencies, or instrumentalities, if, immediately after
                      the purchase, more than 5% of the value of the Fund's
                      total assets would be invested in such issuer (except that
                      up to 25% of the value of the Fund's total assets may be
                      invested without regard to the 5% limitation). (As
                      indicated below, the Funds have adopted a non-fundamental
                      investment policy that is more restrictive than this
                      fundamental investment limitation);
 
                        2) Purchase any securities that would cause more than
                      25% of the value of the Fund's total assets at the time of
                      purchase to be invested in the securities of one or more
                      issuers conducting their principal business activities in
                      the same industry, provided that (a) there is no
                      limitation with respect to obligations issued or
 
                                       24
<PAGE>   104
 
                      guaranteed by the U.S. Government, its agencies, or
                      instrumentalities, domestic bank certificates of deposit
                      or bankers' acceptances, and repurchase agreements secured
                      by bank instruments or obligations of the U.S. Government,
                      its agencies, or instrumentalities; (b) wholly owned
                      finance companies will be considered to be in the
                      industries of their parents if their activities are
                      primarily related to financing the activities of their
                      parents; and (c) utilities will be divided according to
                      their services (for example, gas, gas transmission,
                      electric and gas, electric and telephone will each be
                      considered a separate industry).
 
                        3) Make loans, except that a Fund may purchase or hold
                      debt instruments, lend portfolio securities, and enter
                      into repurchase agreements as permitted by its individual
                      investment objective and policies.
 
                        The California Tax-Free Money Market Fund may not:
 
                        4) Purchase securities of any one issuer, other than
                      obligations issued or guaranteed by the U.S. Government,
                      its agencies, or instrumentalities, if, immediately after
                      the purchase, more than 5% of the value of its total
                      assets would be invested in such issuer (except that up to
                      25% of the value of the Fund's total assets may be
                      invested without regard to the 5% limitation). For
                      purposes of this investment restriction, a security is
                      considered to be issued by the government entity (or
                      entities) whose assets and revenues back the security or,
                      with respect to a private activity bond that is backed
                      only by the assets and revenues of a non-governmental
                      user, by the non-governmental user;
 
                        5) Purchase any securities that would cause 25% or more
                      of such Fund's total assets at the time of purchase to be
                      invested in the securities of one or more issuers
                      conducting their principal business activities in the same
                      industry; provided that this limitation shall not apply to
                      securities of the U.S. Government, its agencies or
                      instrumentalities or Municipal Securities or governmental
                      guarantees of Municipal Securities; and provided, further,
                      that for the purpose of this limitation, private activity
                      bonds that are backed only by the assets and revenues of a
                      non-governmental user shall not be deemed to be Municipal
                      Securities.
 
                        6) Make loans; except that the Fund may purchase or hold
                      debt instruments, lend portfolio securities and enter into
                      repurchase agreements as permitted by its investment
                      objective and policies.
 
                        The foregoing percentages will apply at the time of the
                      purchase of a security. The investment limitations listed
                      above are fundamental policies the substance of which may
                      not be changed without a vote of a majority of the
                      outstanding Shares of the respective Fund. Additional
                      fundamental and non-fundamental investment limitations are
                      set forth in the Statement of Additional Information.
 
                                       25
<PAGE>   105
 
                        The Diversified Money Market Fund, the Government
                      Obligations Money Market Fund, and the 100% U.S. Treasury
                      Money Market Fund have each adopted, in accordance with
                      Rule 2a-7, a non-fundamental policy providing that the 5%
                      limit noted in limitation (1) above shall apply to 100% of
                      each Fund's assets. Notwithstanding, each such Fund may
                      invest up to 25% of its assets in First Tier qualified
                      securities of a single issuer for up to three business
                      days.
 
PURCHASE AND
REDEMPTION
OF SHARES               As noted above, the Funds are divided into two classes
                      of Shares, Retail and Fiduciary. Only the following
                      investors qualify to purchase the Funds' Fiduciary Shares:
                      (i) fiduciary, advisory, agency, custodial and other
                      similar accounts maintained with Union Bank of California,
                      N.A. or its affiliates; (ii) SelectIRA accounts
                      established with The Bank of California, N.A. and invested
                      in any of HighMark's Equity or Income Funds prior to June
                      20, 1994, which have remained continuously open thereafter
                      and which are not considered to be fiduciary accounts;
                      (iii) Shareholders who currently own Shares of HighMark's
                      Equity or Income Funds that were purchased prior to June
                      20, 1994 within an account registered in their name with
                      the Funds; and (iv) present and retired directors,
                      officers and employees (and their spouses and children
                      under the age of 21) of Union Bank of California, N.A.,
                      HighMark's current or former distributors or their
                      respective affiliated companies who currently own Shares
                      of HighMark Funds which were purchased before April 30,
                      1997. For a description of investors who qualify to
                      purchase Retail Shares, see the Retail Shares prospectus
                      of the Money Market Funds.
 
                        Purchases and redemptions of Shares of the Funds may be
                      made on days on which both the New York Stock Exchange and
                      Federal Reserve wire system are open for business
                      ("Business Days"). The minimum initial investment is
                      generally $1,000 and the minimum subsequent investment is
                      generally $100. For present and retired directors,
                      officers, and employees (and their spouses and children
                      under the age of 21) of Union Bank of California, SEI
                      Financial Services Company and their affiliates, the
                      minimum initial investment is $250 and the minimum
                      subsequent investment is $50. The Fund's initial and
                      subsequent minimum purchase amounts may be waived, in the
                      Distributor's discretion if purchases are made in
                      connection with Individual Retirement Accounts, Keoghs,
                      payroll deduction plans, 401(k) or similar programs or
                      accounts. Shareholders may place orders by telephone.
 
                        Purchase orders will be effective on the Business Day
                      made if the Distributor receives an order before 8:00
                      a.m., Pacific time (11:00 a.m., Eastern time) for the
                      California Tax-Free Money Market Fund, 9:00 a.m., Pacific
                      time (12:00 noon, Eastern time) for the 100% U.S. Treasury
                      Money Market Fund and 10:00 a.m., Pacific time (1:00 p.m.,
                      Eastern time) for the Diversified Money Market and U.S.
                      Government Money Market Funds, on such Business Day.
                      Otherwise, the
 
                                       26
<PAGE>   106
 
                      purchase order will be effective the next Business Day.
                      Effectiveness of a purchase order on any Business Day is
                      contingent on the Custodian's receipt of Federal funds
                      before 11:00 a.m., Pacific time (2:00 p.m., Eastern time),
                      on such day. The purchase price is the net asset value per
                      Share, which is expected to remain constant at $1.00. The
                      net asset value per Share is calculated as of 10:00 a.m.,
                      Pacific time (1:00 p.m., Eastern time), each Business Day
                      based on the amortized cost method. The net asset value
                      per Share of a Fund is determined by dividing the total
                      value of its investments and other assets, less any
                      liabilities, by the total number of its outstanding
                      Shares. HighMark reserves the right to reject a purchase
                      order when the Distributor or the Advisor determines that
                      it is not in the best interest of HighMark and/or
                      Shareholder(s).
 
                        Shares of the Fund are offered only to residents of
                      states in which the shares are eligible for purchase.
 
                        Redemption orders may be made any time before 8:00 a.m.,
                      Pacific time (11:00 a.m., Eastern time) for the California
                      Tax-Free Money Market Fund, 9:00 a.m., Pacific time (12:00
                      noon, Eastern time) for the 100% U.S. Treasury Money
                      Market Fund, and 10:00 a.m., Pacific time (1:00 p.m.,
                      Eastern time) for the Diversified Money Market and U.S.
                      Government Money Market Funds in order to receive that
                      day's redemption price (i.e. the next determined net asset
                      value per share). For redemption orders received before
                      such times for such Funds, payment will be made the same
                      day by transfer of Federal funds. Otherwise, payment will
                      be made on the next Business Day. Redeemed shares are not
                      entitled to dividends declared the day the redemption
                      order is effective. The Funds reserve the right to make
                      payment on redemptions in securities rather than cash.
 
                        Neither HighMark's transfer agent nor HighMark will be
                      responsible for any loss, liability, cost or expense for
                      acting upon wire instructions or upon telephone
                      instructions that it reasonably believes are genuine.
                      HighMark and its transfer agent will each employ
                      reasonable procedures to confirm that telephone
                      instructions are genuine. Such procedures may include
                      taping of telephone conversations. If market conditions
                      are extraordinarily active or extraordinary circumstances
                      exist, and you experience difficulties placing redemption
                      orders by telephone, you may wish to consider placing your
                      order by other means.
 
EXCHANGE
PRIVILEGES              As indicated under GENERAL INFORMATION--Description of
                      HighMark & Its Shares, certain of HighMark's Funds issue
                      two classes of Shares (Retail Shares and Fiduciary
                      Shares); as of the date of this Prospectus, the
                      Distribution Plan and distribution fee payable thereunder
                      are applicable only to such Fund's Retail Shares. A
                      Shareholder's eligibility to exchange into a particular
                      class of Shares will be determined at the time of the
                      exchange. The Shareholder must
 
                                       27
<PAGE>   107
 
                      supply, at the time of the exchange, the necessary
                      information to permit confirmation of qualification.
 
                        Each Fund's Shares may be exchanged for Shares of the
                      class of the various other Funds of HighMark which the
                      Shareholder qualifies to purchase directly so long as the
                      Shareholder maintains the applicable minimum account
                      balance in each Fund in which he or she owns Shares and
                      satisfies the minimum initial and subsequent purchase
                      amounts of the Fund into which the Shares are exchanged.
                      Shareholders may exchange their Fiduciary Shares for
                      Fiduciary Shares of another Fund on the basis of the
                      relative net asset value of the Fiduciary Shares
                      exchanged. Shareholders may also exchange Fiduciary Shares
                      of a Fund for Retail Shares of another Fund. Under such
                      circumstances, the cost of the acquired Retail Shares will
                      be the net asset value per share plus the appropriate
                      sales load.
 
                        Exchanges will be made on the basis of the relative net
                      asset values of the Shares exchanged plus any applicable
                      sales charge. Exchanges are subject to the terms and
                      conditions stated herein and the terms and conditions
                      stated in the respective prospectuses of the Funds.
 
                        Certain entities (including Participating Organizations
                      and Union Bank of California and its affiliates), however,
                      may charge customers a fee with respect to exchanges made
                      on the customer's behalf. Information about these charges,
                      if any, can be obtained by the entity effecting the
                      exchange and this Prospectus should be read in conjunction
                      with that information.
 
                        A Shareholder wishing to exchange Shares in a Fund may
                      do so by contacting the transfer agent at 1-800-433-6884.
                      Exchanges will be effected on any Business Day at the net
                      asset value of the Funds involved in the exchange next
                      determined after the exchange request is received by the
                      transfer agent.
 
                        An exchange is considered to be a sale of Shares for
                      federal income tax purposes on which a Shareholder may
                      realize a capital gain or loss. Exchange privileges may be
                      exercised only in those states where Shares of such other
                      Funds of HighMark may legally be sold. HighMark may
                      materially amend or terminate the exchange privileges
                      described herein upon sixty days' notice.
 
DIVIDENDS               The net income of each Fund is declared daily as a
                      dividend to Shareholders of record at the close of
                      business on the day of declaration.
 
                        Dividends with respect to each Fund are paid monthly in
                      additional full and fractional Shares of the Fund at net
                      asset value as of the date of payment, unless the
                      Shareholder elects to receive such dividends in cash as
                      described below. Shareholders will automatically receive
                      all income dividends and capital gains distributions (if
                      any) paid in respect of a Fund's Shares in additional full
                      and
 
                                       28
<PAGE>   108
 
                      fractional Shares of the same class. Shareholders wishing
                      to receive their dividends in cash (or wishing to revoke a
                      previously made election) must notify the transfer agent
                      at P.O. Box 8416, Boston, MA 02266-8416, and such election
                      (or revocation thereof) will become effective with respect
                      to dividends having record dates after notice has been
                      received. Dividends paid in additional Shares receive the
                      same tax treatment as dividends paid in cash. Dividends
                      are paid in cash not later than seven Business Days after
                      a Shareholder's complete redemption of his or her Shares.
                      Net realized capital gains, if any, are distributed at
                      least annually to Shareholders of record.
 
FEDERAL
TAXATION                Each Fund intends to qualify for treatment as a
                      "regulated investment company" under the Internal Revenue
                      Code of 1986, as amended (the "Code"), and to distribute
                      substantially all of its net investment income so that it
                      is not required to pay federal taxes on these amounts.
                      Because all of the net investment income of the
                      Diversified Money Market Fund, the U.S. Government Money
                      Market Fund, the 100% U.S. Treasury Money Market Fund and
                      the California Tax-Free Money Market Fund is expected to
                      be derived from interest, it is anticipated that no part
                      of any distribution will be eligible for the federal
                      dividends received deduction for corporations. The Funds
                      are not managed to generate any long-term capital gains
                      and, therefore, the Funds do not foresee paying any
                      significant "capital gains dividends" as described in the
                      Code.
 
                        Shareholders will be subject to federal income tax with
                      respect to dividends paid by the Diversified Money Market
                      Fund, the U.S. Government Money Market Fund and the 100%
                      U.S. Treasury Money Market Fund (including any capital
                      gains dividends). Dividends that are attributable to
                      interest on U.S. Government obligations earned by the
                      Funds may be exempt from state and local tax, and
                      Shareholders should consult their own tax advisors to
                      determine whether these dividends are eligible for the
                      state and local tax exemption. Dividends (except to the
                      extent attributable to gains or securities lending income)
                      paid by the 100% U.S. Treasury Money Market Fund will be
                      exempt from California and Oregon personal income taxes.
                      HighMark intends to advise Shareholders annually of the
                      proportion of a Fund's dividends that consists of interest
                      on U.S. Government obligations.
 
                        Exempt-interest dividends from the California Tax-Free
                      Money Market Fund are excludable from gross income for
                      federal income tax purposes. Such dividends may be taxable
                      to Shareholders under state or local law as ordinary
                      income even though all or a portion of the amounts may be
                      derived from interest on tax-exempt obligations which, if
                      realized directly, would be exempt from such taxes.
                      Shareholders are advised to consult a tax advisor with
                      respect to whether exempt-interest dividends retain the
                      exclusion if such Shareholder would be treated as a
                      "substantial user" or a "related person" to such user
                      under the Code.
 
                                       29
<PAGE>   109
 
                        Under the Code, interest on indebtedness incurred or
                      continued by a Shareholder to purchase or carry Shares of
                      the California Tax-Free Money Market Fund is not
                      deductible for federal income tax purposes to the extent
                      the Fund distributes exempt-interest dividends during the
                      Shareholder's taxable year.
 
                        Under the Code, if a Shareholder sells a Share of the
                      California Tax-Free Money Market Fund after holding it for
                      six months or less, any loss on the sale or exchange of
                      such Share will be disallowed to the extent of the amount
                      of any exempt-interest dividends that the Shareholder has
                      received with respect to the Share that is sold.
 
                        In addition, any loss (not already disallowed as
                      provided in the preceding sentence) realized upon a
                      taxable disposition of shares held for six months or less
                      will be treated as long-term, rather than short-term, to
                      the extent of any long-term capital gain distributions
                      received by the shareholder with respect to the shares.
 
                        The California Tax-Free Money Market Fund may at times
                      purchase Municipal Securities at a discount from the price
                      at which they were originally issued. For federal income
                      tax purposes, some or all of this market discount will be
                      included in the California Tax-Free Money Market Fund's
                      ordinary income and will be taxable to Shareholders as
                      such when it is distributed to them.
 
                        To the extent dividends paid to Shareholders are derived
                      from taxable income (for example, from interest on
                      certificates of deposit or repurchase agreements), or from
                      long-term or short-term capital gains, such dividends will
                      be subject to federal income tax, whether such dividends
                      are paid in the form of cash or additional Shares. A
                      Shareholder should consult his or her tax advisor for
                      special advice.
 
                        Under the Code, dividends attributable to interest on
                      certain private activity bonds issued after August 7, 1986
                      must be included in alternative minimum taxable income for
                      the purpose of determining liability (if any) for the
                      federal alternative minimum tax. In addition,
                      exempt-interest dividends will be included in a
                      corporation's "adjusted current earnings" for purposes of
                      the alternative minimum tax (except to the extent derived
                      from interest on certain private activity bonds issued
                      after August 7, 1986, which interest would already be
                      included in alternative minimum taxable income as a
                      specific item of tax preference). Shareholders of the
                      California Tax-Free Money Market Fund receiving social
                      security or railroad retirement benefits may be taxed on a
                      portion of those benefits as a result of receiving
                      tax-exempt income (including exempt-interest dividends
                      distributed by the California Tax-Free Money Market Fund).
 
                        If, at the close of each quarter of its taxable year,
                      the California Tax-Free Money Market Fund continues to
                      qualify for the special federal income tax
 
                                       30
<PAGE>   110
 
                      treatment afforded regulated investment companies and at
                      least 50% of the value of the Fund's total assets consists
                      of California Exempt-Interest Securities, then "California
                      exempt interest dividends" attributable to these
                      securities will be exempt from California personal income
                      tax. A "California-exempt interest dividend" is any
                      dividend distributed by the Fund to the extent that it is
                      derived from the interest received by the Fund on
                      California Exempt-Interest Securities (less related
                      expenses) and designated as such by written notice to
                      Shareholders. For further details, see the Statement of
                      Additional Information. Dividends received by Shareholders
                      subject to California state corporate franchise tax will
                      be taxed as ordinary dividends notwithstanding that all or
                      a portion of such dividends are exempt from California
                      personal income tax. Distributions other than
                      "California-exempt interest dividends" by the Fund to
                      California residents will be subject to California
                      personal income tax, whether or not such dividends are
                      reinvested.
 
                        Additional information regarding federal and California
                      taxes is contained in the Statement of Additional
                      Information. However, the foregoing and the material in
                      the Statement of Additional Information are only brief
                      summaries of some of the important tax considerations
                      generally affecting a money market fund and its
                      Shareholders. In addition, the foregoing discussion and
                      the federal and California tax information in the
                      Statement of Additional Information are based on tax laws
                      and regulations which are in effect as of the date of this
                      Prospectus; these laws and regulations may subsequently
                      change, and such changes could be retroactive.
                      Shareholders will be advised at least annually as to the
                      federal income tax status, and, in the case of
                      Shareholders of the California Tax-Free Money Market Fund,
                      as to the California income tax status, of distributions
                      made during the year.
 
SERVICE
ARRANGEMENTS          The Advisor
 
                        Pacific Alliance Capital Management, a division of Union
                      Bank of California, N.A. serves as the Funds' investment
                      advisor. Subject to the general supervision of HighMark's
                      Board of Trustees, the Advisor manages each Fund in
                      accordance with its investment objective and policies,
                      makes decisions with respect to and places orders for all
                      purchases and sales of the Fund's investment securities,
                      and maintains the Fund's records relating to such
                      purchases and sales.
 
                        For the expenses assumed and services provided by the
                      Advisor as each Fund's investment advisor, Union Bank of
                      California receives a fee from the Diversified Money
                      Market Fund, the U.S. Government Money Market Fund, the
                      100% U.S. Treasury Money Market Fund, and the California
                      Tax-Free Money Market Fund computed daily and paid
                      monthly, at the annual rate of thirty one-hundredths of
                      one percent (.30%) of each Fund's average daily net
                      assets. Union Bank of
 
                                       31
<PAGE>   111
 
                      California may from time to time agree to voluntarily
                      reduce its advisory fee. While there can be no assurance
                      that Union Bank of California will choose to make such an
                      agreement, any voluntary reductions in Union Bank of
                      California's advisory fee will lower the Fund's expenses,
                      and thus increase the Fund's yield and total return,
                      during the period such voluntary reductions are in effect.
                      During HighMark's fiscal year ended July 31, 1996, Union
                      Bank of California received investment advisory fees from
                      the Diversified Money Market Fund, the U.S. Government
                      Money Market Fund, and the 100% U.S. Treasury Money Market
                      Fund aggregating 0.40% of each Fund's average daily net
                      assets and from the California Tax-Free Money Market Fund
                      aggregating 0.23% of the Fund's average daily net assets.
 
                        On April 1, 1996, The Bank of California, N.A.,
                      HighMark's then investment advisor, combined with Union
                      Bank and the resulting bank changed its name to Union Bank
                      of California, N.A. At the same time, the banks'
                      investment management divisions were combined. Each of
                      Union Bank and The Bank of California, N.A. (or their
                      predecessor banks) has been in banking since the early
                      1900's and, historically, each has had significant
                      investment functions within its trust and investment
                      division. UnionBanCal Corporation, the parent of Union
                      Bank of California, N.A., is a publicly held corporation,
                      but is principally held by the Bank of Tokyo-Mitsubishi,
                      Limited. As of September 30, 1996, Union Bank of
                      California and its subsidiaries had approximately $28.7
                      billion in commercial assets. Pacific Alliance Capital
                      Management is a division of Union Bank of California's
                      Trust and Investment Management Group, which, as of June
                      30, 1996, had approximately $13.4 billion of assets under
                      management. The Advisor, with a team of approximately 45
                      stock and bond research analysts, portfolio managers and
                      traders, has been providing investment management services
                      to individuals, institutions and large corporations since
                      1917.
 
                      Administrator
 
                        SEI Fund Resources (the "Administrator") and HighMark
                      are parties to an administration agreement (the
                      "Administration Agreement"). Under the terms of the
                      Administration Agreement, the Administrator provides
                      HighMark with certain management services, including all
                      necessary office space, equipment, personnel, and
                      facilities.
 
                        The Administrator is entitled to a fee, which is
                      calculated daily and paid monthly, at an annual rate of
                      .20% of the average daily net assets of the Funds. The
                      Administrator may waive its fee or reimburse various
                      expenses to the extent necessary to limit the total
                      operating expenses of a Fund's Fiduciary Shares. Any such
                      waiver is voluntary and may be terminated at any time in
                      the Administrator's sole discretion. Currently, the
                      Administrator has agreed to waive its fee to the rate of
                      .18% of the average daily net assets of the Funds.
 
                                       32
<PAGE>   112
 
                        Pursuant to a separate agreement with the Administrator,
                      Union Bank of California, N.A. performs sub-administration
                      services on behalf of each Fund, for which it receives a
                      fee paid by the Administrator at the annual rate of up to
                      0.05% of the average daily net assets of the Funds. Union
                      Bank of California has voluntarily agreed to reduce this
                      fee to 0.03%, but reserves the right to terminate its
                      waiver at any time in its sole discretion. A description
                      of the services performed by Union Bank of California
                      pursuant to this Agreement is contained in the Statement
                      of Additional Information.
 
                      The Transfer Agent
 
                        State Street Bank and Trust Company serves as the
                      transfer agent, dividend disbursing agent, and as a
                      shareholder servicing agent for the Fiduciary Shares of
                      HighMark, for which services it receives a fee.
 
                      Shareholder Service Plan
 
                        To support the provision of Shareholder services to both
                      classes of Shares, HighMark has adopted a Shareholder
                      Service Plan. A description of the services performed by
                      service providers pursuant to the Shareholder Service Plan
                      is contained in the Statement of Additional Information.
                      In consideration of services provided by any service
                      provider, which may include Union Bank of California,
                      N.A., Bank of Tokyo-Mitsubishi, Ltd., or their respective
                      affiliates, each Fund may pay a fee at the rate of up to
                      0.25% of its average daily net assets to such service
                      provider. The service provider may waive such fees at any
                      time. Any such waiver is voluntary and may be terminated
                      at any time. Currently, such fees are being waived to the
                      rate of 0.00% of average daily net assets.
 
                      Distributor
 
                        SEI Financial Services Company (the "Distributor") and
                      HighMark are parties to a distribution agreement
                      ("Distribution Agreement"). The Distribution Agreement is
                      renewable annually and may be terminated by the
                      Distributor, by a majority vote of the Disinterested
                      Trustees or by a majority vote of the outstanding
                      securities of HighMark upon not more than 60 days written
                      notice by either party, or upon assignment by the
                      Distributor. Fiduciary Shares are not subject to
                      HighMark's Distribution Plan or a distribution fee.
 
                      Banking Laws
 
                        Union Bank of California believes that it may perform
                      the services for the Funds contemplated by its investment
                      advisory agreement with HighMark without a violation of
                      applicable banking laws and regulations. Union Bank of
                      California also believes that it may perform
                      sub-administration and sub-accounting services on behalf
                      of each Fund, for which it receives compensation from SEI
                      Fund Resources without a violation of applicable banking
                      laws and regulations.
 
                                       33
<PAGE>   113
 
                      Future changes in federal or state statutes and
                      regulations relating to permissible activities of banks or
                      bank holding companies and their subsidiaries and
                      affiliates, as well as further judicial or administrative
                      decisions or interpretations of present and future
                      statutes and regulations, could change the manner in which
                      Union Bank of California or the Advisor could continue to
                      perform such services for the Funds. For a further
                      discussion of applicable banking laws and regulations, see
                      the Statement of Additional Information.
 
                      Custodian
 
                        Union Bank of California also serves as the custodian
                      and as a shareholder servicing agent for the Funds. The
                      Custodian holds cash, securities and other assets of
                      HighMark as required by the 1940 Act.
 
                        Services performed by Union Bank of California, as the
                      Funds' shareholder servicing agent and custodian, as well
                      as the basis of remuneration for such services, are
                      described in the Statement of Additional Information.
 
GENERAL
INFORMATION           Description of HighMark & Its Shares
 
                        HighMark was organized as a Massachusetts business trust
                      on March 10, 1987, and consists of sixteen series of
                      Shares open for investment representing units of
                      beneficial interest in HighMark's Growth Fund, Income
                      Equity Fund, Balanced Fund, Value Momentum Fund, Blue Chip
                      Growth Fund, Emerging Growth Fund, International Equity
                      Fund, Bond Fund, Intermediate-Term Bond Fund, Government
                      Securities Fund, Convertible Securities Fund, California
                      Intermediate Tax-Free Bond Fund, Diversified Money Market
                      Fund, U.S. Government Money Market Fund, 100% U.S.
                      Treasury Money Market Fund and California Tax-Free Money
                      Market Fund. As of the date hereof, no Shares of the Value
                      Momentum Fund, the Blue Chip Growth Fund, the Emerging
                      Growth Fund, the International Equity Fund, the
                      Intermediate-Term Bond Fund, the Convertible Securities
                      Fund, the Government Securities Fund and the California
                      Intermediate Tax-Free Bond Fund had been offered for sale
                      in HighMark. Shares of each Fund are freely transferable,
                      are entitled to distributions from the assets of the Fund
                      as declared by the Board of Trustees, and, if HighMark
                      were liquidated, would receive a pro rata share of the net
                      assets attributable to that Fund. Shares are without par
                      value.
 
                        As noted above, pursuant to a Multiple Class Plan on
                      file with the Securities and Exchange Commission
                      permitting the issuance and sale of two classes of Shares
                      in selected Funds, Shares of such Funds have been divided
                      into two classes, designated Retail Shares and Fiduciary
                      Shares. For information regarding the Retail Shares of the
                      Funds, interested persons may contact the Distributor for
                      a prospectus at 1-800-433-6884.
 
                                       34
<PAGE>   114
 
                        HighMark believes that as of November 22, 1996 Union
                      Bank of California (475 Sansome Street, Post Office Box
                      45000, San Francisco, CA 94104) was the Shareholder of
                      record of 98.42% of the Fiduciary Shares of the
                      Diversified Money Market Fund, 93.46% of the Fiduciary
                      Shares of the U.S. Government Money Market Fund, 95.03% of
                      the Fiduciary Shares of the 100% U.S. Treasury Money
                      Market Fund, and substantially all of the Fiduciary Shares
                      of the California Tax-Free Money Market Fund.
 
                      Performance Information
 
                        From time to time, HighMark may advertise the "yield"
                      and "effective yield" with respect to the Fiduciary Shares
                      of each Fund and a "tax-equivalent yield" and
                      "tax-equivalent effective yield" for federal, California
                      and Oregon income tax purposes with regard to the
                      Fiduciary Shares of each of the 100% U.S. Treasury Money
                      Market Fund and the California Tax-Free Money Market Fund.
                      Performance information is computed separately for a
                      Fund's Retail and Fiduciary Shares in accordance with the
                      formulas described below. Each yield figure is based on
                      historical earnings and is not intended to indicate future
                      performance.
 
                        The "yield" of a Fund's Fiduciary Shares refers to the
                      income generated by an investment in the class over a
                      seven-day period (which period will be stated in the
                      advertisement). This income is then "annualized." That is,
                      the amount of income generated by the investment during
                      that week is assumed to be generated each week over a
                      52-week period and is shown as a percentage of the
                      investment. The "effective yield" is calculated similarly
                      but, when annualized, the income earned by an investment
                      in the class is assumed to be reinvested. The "effective
                      yield" will be slightly higher than the "yield" because of
                      the compounding effect of this assumed reinvestment.
 
                        The 100% U.S. Treasury Money Market Fund's
                      tax-equivalent yield and tax-equivalent effective yield
                      will reflect the amount of income subject to California or
                      Oregon personal income taxation at the rate specified in
                      the advertisement that a taxpayer would have to earn in
                      order to obtain the same after tax income as that derived
                      from the yield and effective yield of the Fiduciary class.
                      The California Tax-Free Money Market Fund's tax-equivalent
                      yield and tax-equivalent effective yield reflect the
                      amount of income subject to federal income taxation and
                      California personal income taxation at the rate specified
                      in the advertisement that a taxpayer would have to earn in
                      order to obtain the same after tax income as that derived
                      from the yield and effective yield of the Fiduciary class.
 
                        Tax-equivalent yields and tax-equivalent effective
                      yields with respect to a class will be significantly
                      higher than the yield and effective yield of that class.
 
                                       35
<PAGE>   115
 
                        From time to time, HighMark may advertise the aggregate
                      total return and average annual total return of the Funds.
                      The aggregate total return and average annual total return
                      of each Fund may be quoted for the life of each Fund and
                      for five-year and one-year periods, in each case, through
                      the most recent calendar quarter. Aggregate total return
                      is determined by calculating the change in the value of a
                      hypothetical $1,000 investment in a Fund over the
                      applicable period that would equate the initial amount
                      invested to the ending redeemable value of the investment.
                      The ending redeemable value includes dividends and capital
                      gain distributions reinvested at net asset value. Average
                      annual total return is calculated by annualizing a Fund's
                      aggregate total return over the relevant number of years.
                      The resulting percentage indicates the positive or
                      negative investment results that an investor in a Fund
                      would have experienced from changes in Share price and
                      reinvestment of dividends and capital gain distributions.
 
                        Each Fund may periodically compare its performance to
                      the performance of: other mutual funds tracked by
                      mutual-fund rating services (such as Lipper Analytical),
                      financial and business publications and periodicals; broad
                      groups of comparable mutual funds; unmanaged indices which
                      may assume investment of dividends but generally do not
                      reflect deductions for administrative and management
                      costs; or other investment alternatives. Certain Funds may
                      advertise performance that includes results from periods
                      in which the Fund's assets were managed in a
                      non-registered predecessor vehicle.
 
                      Miscellaneous
 
                        Shareholders will be sent unaudited semi-annual reports
                      and annual reports audited by independent public
                      accountants.
 
                        Shareholders are entitled to one vote for each Share
                      held in a Fund as determined on the record date for any
                      action requiring a vote by the Shareholders, and a
                      proportionate fractional vote for each fractional Share
                      held. Shareholders of HighMark will vote in the aggregate
                      and not by series or class except (i) as otherwise
                      expressly required by law or when HighMark's Board of
                      Trustees determines that the matter to be voted upon
                      affects only the interests of the Shareholders of a
                      particular series or particular class, and (ii) only
                      Retail Shares will be entitled to vote on matters
                      submitted to a Shareholder vote relating to the
                      Distribution Plan. HighMark is not required to hold
                      regular annual meetings of Shareholders, but may hold
                      special meetings from time to time.
 
                        HighMark's Trustees are elected by Shareholders, except
                      that vacancies may be filled by vote of the Board of
                      Trustees. Trustees may be removed by the Board of
                      Trustees, or by Shareholders at a meeting called for such
                      purpose. For information about how Shareholders may call
                      such a meeting and communicate
 
                                       36
<PAGE>   116
 
                      with other Shareholders for that purpose, see ADDITIONAL
                      INFORMATION--Miscellaneous in the Statement of Additional
                      Information.
 
                        Inquiries may be directed in writing to SEI Financial
                      Services Company, Oaks, Pennsylvania 19456, or by calling
                      toll free 1-800-433-6884.
 
DESCRIPTION OF
PERMITTED
INVESTMENTS             The following is a description of permitted investments
                      for the HighMark Money Market Funds.
 
                        ASSET-BACKED SECURITIES (NON-MORTGAGE)--Debt Instruments
                      secured by company receivables, truck and auto loans,
                      leases, and credit card receivables. Such securities are
                      generally issued as pass-through certificates, which
                      represent undivided fractional ownership interests in the
                      underlying pools of assets. Such securities also may be
                      debt instruments, which are also known as collateralized
                      obligations and are generally issued as the debt of a
                      special purpose entity, such as a trust, organized solely
                      for the purpose of owning such assets and issuing such
                      debt. The purchase of non-mortgage asset-backed securities
                      raises risk considerations peculiar to the financing of
                      the instruments underlying such securities. Asset-backed
                      securities entail prepayment risk, which may vary
                      depending on the type of asset, but is generally less than
                      the prepayment risk associated with mortgage-backed
                      securities.
 
                        Like mortgages underlying mortgage-backed securities,
                      underlying automobile sales contracts or credit card
                      receivables are subject to substantial prepayment risk,
                      which may reduce the overall return to certificate
                      holders. Nevertheless, principal prepayment rates tend not
                      to vary as much in response to changes in interest rates
                      and the short-term nature of the underlying car loans or
                      other receivables tend to dampen the impact of any change
                      in the prepayment level. Certificate holders may also
                      experience delays in payment on the certificates if the
                      full amounts due on underlying sales contracts or
                      receivables are not realized by the trust because of
                      unanticipated legal or administrative costs of enforcing
                      the contracts or because of depreciation or damage to the
                      collateral (usually automobiles) securing certain
                      contracts, or other factors. If consistent with their
                      investment objectives and policies, the Money Market Funds
                      may invest in other asset-backed securities that may be
                      developed in the future.
 
                        BANKERS' ACCEPTANCES--Bills of exchange or time drafts
                      drawn on and accepted by commercial banks. They are used
                      by corporations to finance the shipment and storage of
                      goods and to furnish dollar exchange. Maturities are
                      generally six months or less.
 
                        CERTIFICATES OF DEPOSIT--Negotiable interest-bearing
                      instruments with a specific maturity. Certificates of
                      deposit are issued by banks and savings
 
                                       37
<PAGE>   117
 
                      and loan institutions in exchange for the deposit of funds
                      and normally can be traded in the secondary market prior
                      to maturity.
 
                        COMMERCIAL PAPER--Unsecured short-term promissory notes
                      issued by corporations and other entities. Maturities on
                      these issues vary from a few days to nine months. Purchase
                      of such instruments involves a risk of default by the
                      issuer.
 
                        DERIVATIVES--Instruments whose value is derived from an
                      underlying contract, index or security, or any combination
                      thereof, including futures, options (e.g., puts and
                      calls), options on futures, swap agreements, and some
                      mortgage-backed securities (CMOs, REMICs, IOs and POs).
                      See elsewhere in this "DESCRIPTION OF PERMITTED
                      INVESTMENTS" for discussions of these various instruments,
                      and see "INVESTMENT OBJECTIVES" and "INVESTMENT POLICIES"
                      for more information about any policies and limitations
                      applicable to their use.
 
                        INVESTMENT GRADE BONDS--Interest-bearing or discounted
                      government or corporate securities that obligate the
                      issuer to pay the bondholder a specified sum of money,
                      usually at specific intervals, and to repay the principal
                      amount of the loan at maturity. Investment grade bonds are
                      those rated BBB or better by S&P or Baa or better by
                      Moody's or similarly rated by other NRSROs, or, if not
                      rated, determined to be of comparable quality by the
                      Advisor.
 
                        LOAN PARTICIPATIONS--Loan participations are interests
                      in loans to U.S. corporations (i.e., borrowers) which are
                      administered by the lending bank or agent for a syndicate
                      of lending banks, and sold by the lending bank or
                      syndicate member ("intermediary bank"). In a loan
                      participation, the borrower of the underlying loan will be
                      deemed to be the issuer of the participation interest
                      (except to the extent a purchasing Fund derives its rights
                      from the intermediary bank). Because the intermediary bank
                      does not guarantee a loan participation in any way, a loan
                      participation is subject to the credit risks associated
                      with the underlying corporate borrower. In addition, in
                      the event the underlying corporate borrower fails to pay
                      principal and interest when due, a Fund may encounter
                      delays, expenses and risks that are greater than those
                      that would have been involved if the Fund had purchased a
                      direct obligation (such as commercial paper) of such
                      borrower because it may be necessary under the terms of
                      the loan participation, for the Fund to assert its rights
                      against the borrower through the intermediary bank.
                      Moreover, under the terms of a loan participation, the
                      purchasing Fund may be regarded as a creditor of the
                      intermediary bank (rather than of the underlying corporate
                      borrower), so that a Fund may also be subject to the risk
                      that the issuing bank may become insolvent. Further, in
                      the event of the bankruptcy or insolvency of the corporate
                      borrower, a loan participation may be subject to certain
                      defenses that can be asserted by such borrower as a result
                      of improper conduct by the issuing bank. The secondary
                      market, if any, for these
 
                                       38
<PAGE>   118
 
                      loan participations is limited, and any such participation
                      purchased by a Fund may be regarded as illiquid.
 
                        MUNICIPAL FORWARDS--Municipal Forwards are forward
                      commitments for the purchase of tax-exempt bonds with a
                      specified coupon to be delivered by an issuer at a future
                      date, typically exceeding 45 days but normally less than
                      one year after the commitment date. Municipal forwards are
                      normally used as a refunding mechanism for bonds that may
                      only be redeemed on a designated future date. As with
                      forward commitments and when-issued securities, municipal
                      forwards are subject to market fluctuations due to
                      changes, real or anticipated, in market interest rates
                      between the commitment date and the settlement date and
                      will have the effect of leveraging the Fund's assets.
                      Municipal forwards may be considered to be illiquid
                      investments. The Fund will maintain liquid, high-grade
                      securities in a segregated account in an amount at least
                      equal to the purchase price of the municipal forward.
 
                        MUNICIPAL SECURITIES--Municipal securities consist of
                      (i) debt obligations issued by or on behalf of public
                      authorities to obtain funds to be used for various public
                      facilities, for refunding outstanding obligations, for
                      general operating expenses and for lending such funds to
                      other public institutions and facilities, and (ii) certain
                      private activity and industrial development bonds issued
                      by or on behalf of public authorities to obtain funds to
                      provide for the construction, equipment, repair or
                      improvement of privately operated facilities. Municipal
                      notes include general obligation notes, tax anticipation
                      notes, revenue anticipation notes, bond anticipation
                      notes, certificates of indebtedness, demand notes and
                      construction loan notes. Municipal bonds include general
                      obligation bonds, revenue or special obligation bonds,
                      private activity and industrial development bonds. General
                      obligation bonds are backed by the taxing power of the
                      issuing municipality. Revenue bonds are backed by the
                      revenues of a project or facility, tolls from a toll
                      bridge, for example. The payment of principal and interest
                      on private activity and industrial development bonds
                      generally is dependent solely on the ability of the
                      facility's user to meet its financial obligations and the
                      pledge, if any, of real and personal property so financed
                      as security for such payment.
 
                        PARTICIPATION INTERESTS--Participation interests are
                      interests in municipal securities from financial
                      institutions such as commercial and investment banks,
                      savings and loan associations and insurance companies.
                      These interests may take the form of participations,
                      beneficial interests in a trust, partnership interests or
                      any other form of indirect ownership that allows the Fund
                      to treat the income from the investment as exempt from
                      federal income tax. The Fund invests in these
                      participation interests in order to obtain credit
                      enhancement or demand features that would not be available
                      through direct ownership of the underlying municipal
                      securities.
 
                                       39
<PAGE>   119
 
                        RECEIPTS--Interests in separately traded interest and
                      principal component parts of U.S. Treasury obligations
                      that are issued by banks and brokerage firms and are
                      created by depositing Treasury notes and Treasury bonds
                      into a special account at a custodian bank. The custodian
                      holds the interest and principal payments for the benefit
                      of the registered owners of the certificates of such
                      receipts. The custodian arranges for the issuance of the
                      certificates or receipts evidencing ownership and
                      maintains the register. Receipts include "Treasury
                      Receipts" ("TR's"), "Treasury Investment Growth Receipts"
                      ("TIGR's"), and "Certificates of Accrual on Treasury
                      Securities" ("CATS"). TR's, TIGR's and CATS are sold as
                      zero coupon securities, which means that they are sold at
                      a substantial discount and redeemed at face value at their
                      maturity date without interim cash payments of interest or
                      principal. This discount is accreted over the life of the
                      security, and such accretion will constitute the income
                      earned on the security for both accounting and tax
                      purposes. Because of these features, such securities may
                      be subject to greater interest rate volatility than
                      interest-paying securities. See also "FEDERAL TAXATION."
 
                        REPURCHASE AGREEMENTS--Agreements whereby a Fund will
                      acquire securities from approved financial institutions or
                      registered broker-dealers that agree to repurchase the
                      securities at a mutually agreed-upon date and price. The
                      repurchase agreements entered into by the Funds will
                      provide that the underlying security at all times shall
                      have a value equal to 102% of the resale price stated in
                      the agreement. Repurchase agreements involving government
                      securities are not subject to a Fund's fundamental
                      investment limitation on purchasing securities of any one
                      issuer. If the seller defaults on its repurchase
                      obligation or becomes insolvent, the Fund holding such
                      obligations would suffer a loss to the extent that either
                      the proceeds from a sale of the underlying portfolio
                      securities were less than the repurchase price or the
                      Fund's disposition of the securities was delayed pending
                      court action. Securities subject to repurchase agreements
                      will be held by a qualified custodian or in the Federal
                      Reserve/Treasury book-entry system. Repurchase agreements
                      are considered to be loans by a Fund under the Investment
                      Company Act of 1940 (the "1940 Act").
 
                        REVERSE REPURCHASE AGREEMENTS--A Fund may borrow funds
                      for temporary purposes by entering into reverse repurchase
                      agreements, provided such action is consistent with the
                      Fund's investment objective and fundamental investment
                      restrictions; as a matter of non-fundamental policy, each
                      Fund intends to limit such investments to no more than 10%
                      of the value of its total assets. Pursuant to a reverse
                      repurchase agreement, a Fund will sell portfolio
                      securities to financial institutions such as banks or to
                      broker-dealers, and agree to repurchase the securities at
                      a mutually agreed-upon date and price. A Fund intends to
                      enter into reverse repurchase agreements only to avoid
                      otherwise selling securities during unfavorable market
                      conditions to meet redemptions. At the time a Fund
 
                                       40
<PAGE>   120
 
                      enters into a reverse repurchase agreement, it will place
                      in a segregated custodial account assets such as U.S.
                      Government securities or other liquid, high-quality debt
                      securities consistent with the Fund's investment objective
                      having a value equal to 102% of the repurchase price
                      (including accrued interest), and will subsequently
                      monitor the account to ensure that an equivalent value is
                      maintained. Reverse repurchase agreements involve the risk
                      that the market value of the securities sold by a Fund may
                      decline below the price at which a Fund is obligated to
                      repurchase the securities. Reverse repurchase agreements
                      are considered to be borrowings by a Fund under the 1940
                      Act.
 
                        RULE 144A SECURITIES--Rule 144A Securities are
                      securities that have not been registered under the
                      Securities Act of 1933, but which may be traded between
                      certain qualified institutional investors, including
                      investment companies. The absence of a secondary market
                      may affect the value of the Rule 144A Securities. The
                      Board of Trustees of the Group has established guidelines
                      and procedures to be utilized to determine the liquidity
                      of such securities.
 
                        SECURITIES ISSUED ON A FORWARD COMMITMENT BASIS OR
                      WHEN-ISSUED SECURITIES--Securities purchased for delivery
                      beyond the normal settlement date at a stated price and
                      yield and which thereby involve a risk that the yield
                      obtained in the transaction will be less than that
                      available in the market when delivery takes place. When a
                      Fund agrees to purchase when-issued securities or enter
                      into forward commitments, the Group's custodian will be
                      instructed to set aside cash or liquid portfolio
                      securities equal to the amount of the commitment in a
                      segregated account. A Fund will generally not pay for such
                      securities and no income will accrue on the securities
                      until they are received. These securities are recorded as
                      an asset and are subject to changes in value based upon
                      changes in the general level of interest rates. Therefore,
                      the purchase of securities on a "when-issued" basis or
                      forward commitments may increase the risk of fluctuations
                      in a Fund's net asset value.
 
                        SECURITIES LENDING--During the time portfolio securities
                      are on loan from a Fund, the borrower will pay the Fund
                      any dividends or interest paid on the securities. In
                      addition, loans will be subject to termination by the Fund
                      or the borrower at any time and, while a Fund will
                      generally not have the right to vote securities on loan,
                      it will terminate the loan and regain the right to vote if
                      that is considered important with respect to the
                      investment. While the lending of securities may subject a
                      Fund to certain risks, such as delays or an inability to
                      regain the securities in the event the borrower were to
                      default on its lending agreement or enter into bankruptcy,
                      a Fund will receive 100% collateral in the form of cash or
                      U.S. Government securities. This collateral will be valued
                      daily by the lending agent, with oversight by the Advisor,
                      and, should the market value
 
                                       41
<PAGE>   121
 
                      of the loaned securities increase, the borrower will be
                      required to furnish additional collateral to the Fund.
 
                        SECURITIES SUBJECT TO A PUT FEATURE--A "put" feature
                      permits a Fund to sell a fixed income security at a fixed
                      price prior to maturity. The underlying fixed income
                      securities subject to a put may be sold at any time at the
                      market rates. However, unless the put was an integral part
                      of the fixed income security as originally issued, it may
                      not be marketable or assignable. Generally, a premium is
                      paid for a put feature or a put feature is purchased
                      separately which results in a lower yield than would
                      otherwise be available for the same fixed income
                      securities.
 
                        TAX-EXEMPT COMMERCIAL PAPER--Commercial paper, which is
                      commercial paper issued by governments and political
                      sub-divisions.
 
                        TIME DEPOSITS--Non-negotiable receipts issued by U.S. or
                      foreign banks in exchange for the deposit of funds. Like
                      certificates of deposit, they earn a specified rate of
                      interest over a definite period of time; however, they
                      cannot be traded in the secondary market. Time deposits
                      with a withdrawal penalty are considered to be illiquid
                      securities.
 
                        U.S. GOVERNMENT AGENCY SECURITIES--Certain Federal
                      agencies have been established as instrumentalities of the
                      U.S. Government to supervise and finance certain types of
                      activities. Issues of these agencies, while not direct
                      obligations of the U.S. Government, are either backed by
                      the full faith and credit of the United States (e.g., GNMA
                      securities) or supported by the issuing agencies' right to
                      borrow from the U.S. Treasury. The issues of other
                      agencies are supported only by the credit of the
                      instrumentality (e.g., FNMA securities).
 
                        U.S. TREASURY OBLIGATIONS--Bills, notes, and bonds
                      issued by the U.S. Treasury, as well as separately traded
                      interest and principal component parts of such obligations
                      known as Separately Traded Registered Interest and
                      Principal Securities ("STRIPS") that are transferable
                      through the Federal book-entry system.
 
                        U.S. Government Securities generally do not involve the
                      credit risks associated with investments in other types of
                      fixed-income securities, although, as a result, the yields
                      available from U.S. Government Securities are generally
                      lower than the yields available from otherwise comparable
                      corporate fixed-income securities. Like other fixed-income
                      securities, however, the values of U.S. Government
                      Securities change as interest rates fluctuate.
                      Fluctuations in the value of portfolio securities will in
                      many cases not affect interest income on existing
                      portfolio securities, but will be reflected in the Fund's
                      net asset value. Because the magnitude of these
                      fluctuations will generally be greater at times when a
                      Fund's average maturity is longer, under certain market
                      conditions the Fund may invest
 
                                       42
<PAGE>   122
 
                      in short-term investments yielding lower current income
                      rather than investing in higher yielding longer-term
                      securities.
 
                        VARIABLE AMOUNT MASTER DEMAND NOTES--Unsecured demand
                      notes that permit the indebtedness thereunder to vary and
                      provide for periodic adjustments in the interest rate
                      according to the terms of the instrument. Because master
                      demand notes are direct lending arrangements between
                      HighMark and the issuer, they are not normally traded.
                      Although there is no secondary market in these notes, the
                      Fund may demand payment of principal and accrued interest
                      at specified intervals. For purposes of the Fund's
                      investment policies, a variable amount master demand note
                      will be deemed to have a maturity equal to the longer of
                      the period of time remaining until the next readjustment
                      of its interest rate or the period of time remaining until
                      the principal amount can be recovered from the issuer
                      through demand.
 
                        VARIABLE AND FLOATING RATE INSTRUMENTS--Obligations that
                      may carry variable or floating rates of interest, may
                      involve conditional or unconditional demand features and
                      may include variable amount master demand notes. The
                      interest rates on these securities may be reset daily,
                      weekly, quarterly or some other reset period, and may have
                      a floor or ceiling on interest rate changes. There is a
                      risk that the current interest rate on such obligations
                      may not accurately reflect existing market interest rates.
                      A demand instrument with a demand notice period exceeding
                      seven days may be considered illiquid if there is no
                      secondary market for such security.
 
                        YANKEE BONDS--Dollar denominated securities issued by
                      foreign-domiciled issuers that obligate the issuer to pay
                      the bondholder a specified sum of money, usually
                      semiannually, and to repay the principal amount of the
                      loan at maturity. Sovereign bonds are bonds issued by the
                      governments of foreign countries. Supranational bonds are
                      those issued by supranational entities, such as the World
                      Bank and European Investment Bank. Canadian bonds are
                      bonds issued by Canadian provinces.
 
                        ZERO-COUPON OBLIGATIONS--Non-income producing securities
                      evidencing ownership of future interest and principal
                      payments on bonds. These obligations pay no current
                      interest and are typically sold at prices greatly
                      discounted from par value. The return on a zero-coupon
                      obligation, when held to maturity, equals the difference
                      between the par value and the original purchase price.
 
                        For federal income tax purposes, the difference between
                      the par value and the original issue price (original issue
                      discount) is included in the income of a holder of a
                      zero-coupon obligation over the term of the obligation
                      even though the interest is not paid until maturity. The
                      amount included in income is determined under a constant
                      interest rate method. In addition, if an obligation is
                      purchased
 
                                       43
<PAGE>   123
 
                      subsequent to its original issue, a holder such as the
                      Income Funds may elect to include market discount in
                      income currently on a ratable accrual method or a constant
                      interest rate method. Market discount is the difference
                      between the obligation's "adjusted issue price" (the
                      original issue price plus original issue discount accrued
                      to date) and the holder's purchase price. If no such
                      election is made, gain on the disposition of a market
                      discount obligation is treated as ordinary income (rather
                      than capital gain) to the extent it does not exceed the
                      accrued market discount.
 
                        Zero-coupon obligations have greater price volatility
                      than other fixed-income obligations of similar maturity
                      and such obligations will be purchased when the yield
                      spread, in light of the obligation's duration, is
                      considered advantageous.
 
                                       44
<PAGE>   124
 
                          HighMark MONEY MARKET FUNDS
                            INVESTMENT PORTFOLIOS OF
                                 HighMark FUNDS
                   For further information (including current
                  yield, purchase and redemption information),
                              call 1-800-433-6884
 
INVESTMENT ADVISOR
Pacific Alliance Capital Management,
a division of Union Bank of California, N.A.
475 Sansome Street
Post Office Box 45000
San Francisco, CA 94104
 
CUSTODIAN
Union Bank of California, N.A.
475 Sansome Street
Post Office Box 45000
San Francisco, CA 94104
 
ADMINISTRATOR & DISTRIBUTOR
SEI Fund Resources and
SEI Financial Services Company
Oaks, Pennsylvania 19456
 
LEGAL COUNSEL
Ropes & Gray
One Franklin Square
1301 K Street, N.W., Suite 800 East
Washington, D.C. 20005
 
AUDITORS
Deloitte & Touche LLP
1700 Courthouse Plaza Northeast
Dayton, OH 45402
<PAGE>   125
 
  NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS IN CONNECTION WITH THE OFFERING
MADE BY THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY HIGHMARK OR
ITS DISTRIBUTOR. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY HIGHMARK OR
BY THE DISTRIBUTOR IN ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY
BE MADE.
 
NOT FDIC INSURED
<PAGE>   126
 
                                [HIGHMARK LOGO]
 
                                 HIGHMARK FUNDS
 
                               TRS-17236(R12/95)
<PAGE>   127
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR
     MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT
     BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR
     THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE
     UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS
     OF ANY SUCH STATE.
 
                             SUBJECT TO COMPLETION
 
                                 HIGHMARK FUNDS
 
                           INTERNATIONAL EQUITY FUND
 
  HighMark Funds ("HighMark") is an open-end, diversified, registered investment
company that offers a convenient means of investing in one or more
professionally managed portfolios of securities. This Prospectus relates to
HighMark's International Equity Fund.
 
                                FIDUCIARY SHARES
 
  HighMark's Fiduciary Shares are offered to the following investors: (i)
fiduciary, advisory, agency, custodial and other similar accounts maintained
with Union Bank of California, N.A. or its affiliates; (ii) SelectIRA accounts
established with The Bank of California, N.A. and invested in any of HighMark's
Equity or Income Funds prior to June 20, 1994, which have remained continuously
open thereafter and which are not considered to be fiduciary accounts; (iii)
Shareholders who currently own Shares of HighMark's Equity or Income Funds that
were purchased prior to June 20, 1994 within an account registered in their name
with the Funds; and (iv) present and retired directors, officers and employees
(and their spouses and children under the age of 21) of Union Bank of
California, N.A., HighMark's current or former distributors or their respective
affiliated companies who currently own Shares of HighMark Funds which were
purchased before April 30, 1997.
 
  This Prospectus sets forth concisely the information about HighMark and the
International Equity Fund that a prospective investor should know before
investing. Investors are advised to read this Prospectus and retain it for
future reference. A Statement of Additional Information dated the same date as
this Prospectus has been filed with the Securities and Exchange Commission and
is available without charge by writing the Distributor, SEI Financial Services
Company, Oaks, Pennsylvania 19456, or by calling 1-800-433-6884. The Statement
of Additional Information is incorporated into this Prospectus by reference.
This Prospectus relates only to the Fiduciary Shares of the International Equity
Fund. Interested persons who wish to obtain a prospectus for the other Funds of
HighMark may contact the Distributor at the above address and telephone number.
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
HIGHMARK'S SHARES ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK, INCLUDING UNION BANK OF CALIFORNIA, N.A., BANK OF
TOKYO-MITSUBISHI, LIMITED OR ANY OF THEIR AFFILIATES OR CORRESPONDENTS.
HIGHMARK'S SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE
CORPORATION OR ANY OTHER GOVERNMENT AGENCY. INVESTMENT IN HIGHMARK INVOLVES
RISKS, INCLUDING POSSIBLE LOSS OF THE PRINCIPAL AMOUNT INVESTED.
 
February 26, 1997
Fiduciary Shares
<PAGE>   128
 
                                    SUMMARY
 
HIGHMARK FUNDS ("HighMark") is an open-end, diversified, registered investment
company providing a convenient way to invest in professionally managed
portfolios of securities. The following provides basic information about the
Fiduciary Shares of the HighMark International Equity Fund (the "International
Equity Fund" or the "Fund"). This summary is qualified in its entirety by
reference to the more detailed information provided elsewhere in the Prospectus
and in the Statement of Additional Information.
 
WHAT IS THE FUND'S INVESTMENT OBJECTIVE? The International Equity Fund seeks to
provide long-term capital appreciation by investing primarily in a diversified
portfolio of equity securities of non-U.S. issuers. (See "INVESTMENT OBJECTIVE")
 
WHAT ARE THE FUND'S PERMITTED INVESTMENTS? The Fund primarily invests,
consistent with its investment objective, in equity securities including common
stocks and securities convertible into common stocks of non-U.S. issuers. The
Fund may also invest consistent with its investment objective and policies in
certain other instruments. (See "INVESTMENT POLICIES")
 
WHAT ARE THE RISKS INVOLVED WITH AN INVESTMENT IN THE INTERNATIONAL EQUITY FUND?
The investment policies of the Fund entail certain risks and considerations of
which an investor should be aware. The Fund may purchase common stocks and other
equity securities that are volatile and which may fluctuate in value more than
other types of investments. In addition, the Fund will invest in securities of
foreign companies that involve special risks and considerations not typically
associated with investing in U.S. companies. (See "Risk Factors")
 
ARE MY INVESTMENTS INSURED? HighMark's Shares are not federally insured by the
FDIC or any other government agency. Any guarantee by the U.S. Government, its
agencies or any instrumentalities of the securities in which the Fund invests
guarantees only the payment of principal and interest on the guaranteed
security, and does not guarantee the total return or value of the security or
total return or value of Shares of the Fund.
 
WHO IS THE ADVISOR? Pacific Alliance Capital Management, a division of Union
Bank of California, N.A., serves as the Advisor to HighMark. (See "The Advisor")
 
WHO IS THE SUB-ADVISOR? Tokyo-Mitsubishi Asset Management (U.K.), Ltd. serves as
the Sub-Advisor to the Fund. (See "The Sub-Advisor")
 
WHO IS THE ADMINISTRATOR? SEI Fund Resources serves as the Administrator of
HighMark. (See "The Administrator")
 
WHO IS THE CUSTODIAN? Union Bank of California, N.A. (the "Bank") serves as the
custodian of HighMark's assets. (See "The Custodian")
 
WHO IS THE DISTRIBUTOR? SEI Financial Services Company acts as distributor of
HighMark's Shares. (See "The Distributor")
 
HOW DO I PURCHASE AND REDEEM SHARES? Purchases and redemptions may be made
through the Distributor on days on which both the New York Stock Exchange and
the Federal Reserve wire system are open for business ("Business Days"). The
minimum initial investment is generally $1,000. A purchase order will be
effective if
 
                                        2
<PAGE>   129
 
the Distributor receives an order prior to 1:00 p.m., Pacific time (4:00 p.m.,
Eastern time) and the Custodian receives Federal funds before the close of
business on the next Business Day. Purchase orders for Shares will be executed
at a per Share price equal to the asset value next determined after the purchase
order is received and accepted by HighMark. Redemption orders must be placed
prior to 1:00 p.m., Pacific time (4:00 p.m., Eastern time) on any Business Day
for the order to be effective that day. (See "PURCHASE AND REDEMPTION OF
SHARES")
 
HOW ARE DIVIDENDS PAID? Substantially all of the net investment income
(exclusive of capital gains) of the Fund is periodically declared and paid as a
dividend to Shareholders of record. Any capital gain is distributed at least
annually. Distributions are paid in additional shares unless the Shareholder
elects to take the payment in cash. (See "DIVIDENDS")
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                          PAGE
                                                                                          ----
<S>                                                                                       <C>
Summary.................................................................................     2
International Equity Fund Fee Table.....................................................     4
Fund Description........................................................................     5
Investment Objective....................................................................     5
Investment Policies.....................................................................     5
General.................................................................................     6
  Money Market Instruments..............................................................     6
  Illiquid and Restricted Securities....................................................     7
  Lending of Portfolio Securities.......................................................     7
  Other Investments.....................................................................     7
  Risk Factors..........................................................................     8
Investment Limitations..................................................................     9
  Portfolio Turnover....................................................................    10
Purchase and Redemption of Shares.......................................................    10
Exchange Privileges.....................................................................    12
Dividends...............................................................................    13
Federal Taxation........................................................................    13
Service Arrangements....................................................................    15
  The Advisor...........................................................................    15
  The Sub-Advisor.......................................................................    16
  Administrator.........................................................................    16
  The Transfer Agent....................................................................    17
  Shareholder Service Plan..............................................................    17
  Distributor...........................................................................    17
  Banking Laws..........................................................................    17
  Custodian.............................................................................    18
General Information.....................................................................    18
  Description of HighMark & Its Shares..................................................    18
  Performance Information...............................................................    19
  Miscellaneous.........................................................................    19
Description of Permitted Investments....................................................    20
</TABLE>
 
                                        3
<PAGE>   130
 
                      INTERNATIONAL EQUITY FUND FEE TABLE
 
<TABLE>
<CAPTION>
                                                                                                        INTERNATIONAL
                                                                                                         EQUITY FUND
                                                                                                          FIDUCIARY
                                                                                                           SHARES
                                                                                                        -------------
<S>                                                                                                     <C>
SHAREHOLDER TRANSACTION EXPENSES(A)
  Maximum Sales Load Imposed on Purchases (as a percentage of offering price).........................         0%
  Maximum Sales Load Imposed on Reinvested Dividends (as a percentage of offering price)..............         0%
  Deferred Sales Load (as a percentage of original purchase price or redemption proceeds, as
    applicable).......................................................................................         0%
  Redemption Fees (as a percentage of amount redeemed, if applicable)(b)..............................         0%
  Exchange Fee(a).....................................................................................      $   0
ANNUAL OPERATING EXPENSES (as a percentage of net assets)
  Management Fees.....................................................................................      0.95%
  12b-1 Fees..........................................................................................      0.00%
  Other Expenses (after voluntary reduction)(c).......................................................      0.31%
  Total Fund Operating Expenses(d)....................................................................      1.26%
                                                                                                            =====
</TABLE>
 
  EXAMPLE: You would pay the following expenses on a $1,000 investment, assuming
(1) 5% annual return and (2) redemption at the end of each time period.
 
<TABLE>
<CAPTION>
                                                                         3        5        10
                                                              1 YEAR   YEARS    YEARS     YEARS
                                                              ------   ------   ------   -------
<S>                                                           <C>      <C>      <C>      <C>
International Equity Fund Fiduciary Shares..................   $ 13     $ 40     $ 69     $ 152
</TABLE>
 
  The purpose of the table above is to assist an investor in the International
Equity Fund in understanding the various costs and expenses that a Shareholder
will bear directly or indirectly. For a more complete discussion of the Fund's
annual operating expenses, see SERVICE ARRANGEMENTS below. THE FOREGOING EXAMPLE
SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE EXPENSES. ACTUAL
EXPENSES MAY BE GREATER OR LESS THAN THOSE SHOWN.
- ---------------
 
(a) Certain entities (including Union Bank of California and its affiliates)
    making investments in the International Equity Fund on behalf of their
    customers may charge customers fees for services provided in connection with
    the investment in, redemption of, and exchange of Shares. (See PURCHASE AND
    REDEMPTION OF SHARES, EXCHANGE PRIVILEGES, and SERVICE ARRANGEMENTS--
    below.)
 
(b) A wire redemption charge is deducted from the amount of a wire redemption
    payment made at the request of a Shareholder. (See PURCHASE AND REDEMPTION
    OF SHARES below.)
 
(c) OTHER EXPENSES are based on the Fund's estimated expenses for the current
    fiscal year. Absent voluntary fee waivers, OTHER EXPENSES would be 0.58% for
    the Fiduciary Shares of the International Equity Fund.
 
(d) Absent voluntary fee waivers, TOTAL FUND OPERATING EXPENSES would be 1.53%
    for the Fiduciary Shares of the International Equity Fund.
 
                                        4
<PAGE>   131
 
FUND
DESCRIPTION             HighMark Funds ("HighMark") is an open-end, diversified,
                      registered investment company that currently offers units
                      of beneficial interest ("Shares") in sixteen separate
                      investment portfolios ("Funds"). All of the Funds are
                      advised by Pacific Alliance Capital Management (the
                      "Advisor"), a division of Union Bank of California, N.A.
                      Shareholders may purchase Shares of selected Funds through
                      two separate classes (the "Retail" and "Fiduciary"
                      classes). These classes may have different sales charges
                      and other expenses, which may affect performance.
                      Information regarding HighMark's other Funds and other
                      classes is contained in separate prospectuses that may be
                      obtained from HighMark's Distributor, SEI Financial
                      Services Company, at Oaks, Pennsylvania 19456, or by
                      calling 1-800-433-6884.
 
                        For information concerning those investors who qualify
                      to purchase Fiduciary Shares, see PURCHASE AND REDEMPTION
                      OF SHARES below. (Fiduciary Shares may be hereinafter
                      referred to as "Shares.")
 
INVESTMENT
OBJECTIVE               The International Equity Fund seeks to provide long-term
                      capital appreciation by investing primarily in a
                      diversified portfolio of equity securities of non-U.S.
                      issuers.
 
                        The investment objective and certain of the investment
                      limitations of the International Equity Fund may not be
                      changed without a vote of the holders of a majority of the
                      outstanding Shares of the Fund (as defined under GENERAL
                      INFORMATION--Miscellaneous below). There can be no
                      assurance that the Fund will achieve its investment
                      objective.
 
INVESTMENT
POLICIES                Under normal market conditions, at least 65% of the
                      Fund's assets will be invested in the following equity
                      securities of non-U.S. issuers: common stocks, securities
                      convertible into common stocks, preferred stocks, warrants
                      and rights to purchase common stock. Under normal market
                      conditions, at least 65% of the Fund's total assets will
                      be invested in securities of issuers organized under the
                      laws of at least five countries other than the United
                      States that are included in the Morgan Stanley Capital
                      International Europe, Australia and Far East Index (the
                      "EAFE Index").(1) Countries may be over- or under-weighted
                      in comparison to the EAFE Index based upon the Advisor's
                      and Sub-Advisors's view of forecasted rates of returns.
                      Regional and individual country weightings, therefore, may
                      vary from the EAFE Index benchmark. The Advisor and
                      Sub-Advisor will select individual securities for the Fund
                      on the basis of their growth opportunities or
                      undervaluation in relation to other securities. The Fund
                      expects its investments to emphasize companies with market
                      capitalizations in excess of $100,000,000.
 
- ---------------
 
    (1)"MSCI-EAFE Index" is a registered service mark of Morgan Stanley Capital
International which does not sponsor and is in no way affiliated with the
International Equity Fund.
 
                                        5
<PAGE>   132
 
                        The Fund will typically invest in equity securities
                      listed on recognized foreign exchanges, but may also
                      invest up to 15% of its total assets in securities traded
                      in over-the-counter markets. Equity securities of non-U.S.
                      issuers may also be purchased in the form of sponsored or
                      unsponsored American Depositary Receipts ("ADRs") and
                      sponsored or unsponsored European Depositary Receipts
                      ("EDRs").
 
                        The Fund may enter into forward foreign currency
                      contracts as a hedge against possible variations in
                      foreign exchange rates. A forward foreign currency
                      contract is a commitment to purchase or sell a specified
                      currency at a specified date, at a specified price. The
                      Fund may enter into forward foreign currency contracts to
                      hedge a specific security transaction or to hedge a
                      portfolio position. These contracts may be bought and sold
                      to protect the Fund, to some degree, against a possible
                      loss resulting from an adverse change in the relationship
                      between foreign currencies. The Fund may also invest in
                      options on currencies.
 
                        The premium paid on options on securities positions will
                      not exceed 10% of the Fund's net assets at the time such
                      options are entered into by the Fund. The aggregate
                      premium paid on all options on stock indices will not
                      exceed 20% of the Fund's total assets.
 
                        The Fund's remaining assets may be invested in
                      investment grade bonds and debentures issued by non-U.S.
                      or U.S. companies, obligations of supranational entities,
                      securities issued or guaranteed by foreign and U.S.
                      governments, and foreign and U.S. commercial paper.
                      Certain of these instruments may have floating or variable
                      interest rate provisions. In addition, the Fund may invest
                      in securities of issuers whose principal activities are in
                      countries with emerging markets. The Fund defines an
                      emerging market country as any country whose economy and
                      market the World Bank or the United Nations considers to
                      be emerging or developing. The Fund may also purchase
                      shares of closed-end investment companies that invest in
                      the securities of issuers in a single country or region
                      and shares of open-end management investment companies.
 
GENERAL               Money Market Instruments
 
                        Under normal market conditions, the International Equity
                      Fund may invest up to 35% of its total assets in money
                      market instruments. When market conditions indicate a
                      temporary "defensive" investment strategy as determined by
                      the Advisor, the Fund may invest more than 35% of its
                      total assets in money market instruments. The Fund will
                      not be pursuing its investment objective to the extent
                      that a substantial portion of its assets are invested in
                      money market instruments.
 
                                        6
<PAGE>   133
 
                      Illiquid and Restricted Securities
 
                        The International Equity Fund shall limit investment in
                      illiquid securities to 15% or less of its net assets.
                      Generally, an "illiquid security" is any security that
                      cannot be disposed of promptly and in the ordinary course
                      of business at approximately the amount at which the Fund
                      has valued the instrument. The absence of a trading market
                      can make it difficult to ascertain the market value of
                      illiquid securities. The Fund may purchase restricted
                      securities which have not been registered under the
                      Securities Act of 1933 (e.g., Rule 144A Securities and
                      Section 4(2) commercial paper) subject to policies
                      approved by the Board of Trustees. See INVESTMENT
                      RESTRICTIONS in the Statement of Additional Information.
 
                      Lending of Portfolio Securities
 
                        In order to generate additional income, the Fund may
                      lend its portfolio securities to broker-dealers, banks or
                      other institutions. The Fund may lend portfolio securities
                      in an amount representing up to 33 1/3% of the value of
                      the Fund's total assets.
 
                      Other Investments
 
                        The Fund may enter into repurchase agreements and
                      reverse repurchase agreements.
 
                        The International Equity Fund may enter into forward
                      commitments or purchase securities on a "when-issued"
                      basis. The International Equity Fund expects that
                      commitments by it to enter into forward commitments or
                      purchase when-issued securities will not exceed 25% of the
                      value of the Fund's total assets under normal market
                      conditions. The Fund does not intend to purchase when-
                      issued securities or forward commitments for speculative
                      or leveraging purposes but only for the purpose of
                      acquiring portfolio securities.
 
                        The International Equity Fund may invest up to 5% of its
                      total assets in the shares of any one registered
                      investment company, but may not own more than 3% of the
                      securities of any one registered investment company or
                      invest more than 10% of its assets in the securities of
                      other registered investment companies. In accordance with
                      an exemptive order issued to HighMark by the SEC, such
                      other registered investment company securities may include
                      shares of a money market fund of HighMark, and may include
                      registered investment companies for which the Advisor or
                      Sub-Advisor to a Fund of HighMark, or an affiliate of such
                      Advisor or Sub-Advisor, serves as investment advisor,
                      administrator or distributor. Because other investment
                      companies employ an investment advisor, such investment by
                      a Fund may cause Shareholders to bear duplicative fees.
                      The Advisor will waive its fees attributable to the assets
                      of the investing Fund invested
 
                                        7
<PAGE>   134
 
                      in a money market fund of HighMark, and, to the extent
                      required by applicable law, the Advisor will waive its
                      fees attributable to the assets of the Fund invested in
                      any investment company. Some Funds are subject to
                      additional restrictions on investment in other investment
                      companies. See "INVESTMENT RESTRICTIONS" in the Statement
                      of Additional Information.
 
                        The Fund may invest in futures and options on futures
                      for the purpose of achieving the Fund's objectives. The
                      Fund may invest in futures and related options based on
                      any type of security or index traded on U.S. or foreign
                      exchanges or over the counter, as long as the underlying
                      security or securities represented by an index, are
                      permitted investments of the Fund. Such futures contracts
                      may include index contracts and contracts for foreign
                      currencies. The Fund may enter into futures contracts and
                      options on futures only to the extent that its obligations
                      under such contracts or transactions, together with
                      options on securities or indices represent not more than
                      25% of the Fund's assets.
 
                        For further information, see "DESCRIPTION OF PERMITTED
                      INVESTMENTS."
 
                      Risk Factors
 
                        Since the Fund invests in equity securities, the Fund's
                      Shares will fluctuate in value, and thus may be more
                      suitable for long-term investors who can bear the risk of
                      short-term fluctuations.
 
                        There may be certain risks connected with investing in
                      foreign securities, including risks of adverse political
                      and economic developments (including possible governmental
                      seizure or nationalization of assets), the possible
                      imposition of exchange controls or other governmental
                      restrictions, including less uniformity in accounting and
                      reporting requirements, the possibility that there will be
                      less information on such securities and their issuers
                      available to the public, the difficulty of obtaining or
                      enforcing court judgments abroad, restrictions on foreign
                      investments in other jurisdictions, difficulties in
                      effecting repatriation of capital invested abroad, and
                      difficulties in transaction settlements and the effect of
                      delay on shareholder equity. Foreign securities may be
                      subject to foreign taxes, which reduce yield, and may be
                      less marketable than comparable U.S. securities. The value
                      of the Fund's investments denominated in foreign
                      currencies will depend on the relative strengths of those
                      currencies and the U.S. dollar, and the Fund may be
                      affected favorably or unfavorably by changes in the
                      exchange rates or exchange control regulations between
                      foreign currencies and the U.S. dollar. Changes in foreign
                      currency exchange rates may also affect the value of
                      dividends and interest earned, gains and losses realized
                      on the sale of securities, and net investment income and
                      gains, if any, to be distributed to Shareholders by the
                      Fund.
 
                                        8
<PAGE>   135
 
                        Forward foreign currency contracts do not eliminate
                      fluctuations in the underlying prices of securities.
                      Rather, they simply establish a rate of exchange which one
                      can achieve at some future point in time. Additionally,
                      although such contracts tend to minimize the risk of loss
                      due to a decline in the value of the hedged currency at
                      the same time, they tend to limit any potential gain which
                      might result, should the value of such currency increase.
 
                        The Fund's investments in emerging markets can be
                      considered speculative, and therefore, may offer higher
                      potential for gains and losses than developed markets of
                      the world. With respect to any emerging country, there is
                      the greater potential for nationalization, expropriation
                      or confiscatory taxation, political changes, government
                      regulation, social instability or diplomatic developments
                      (including war) which could affect adversely the economies
                      of such countries or investments in such countries. In
                      addition, it may be difficult to obtain and enforce a
                      judgment in the courts of such countries. The economies of
                      developing countries generally are heavily dependent upon
                      international trade and, accordingly, have been and may
                      continue to be adversely affected by trade barriers,
                      exchange controls, managed adjustments in relative
                      currency values and other protectionist measures imposed
                      or negotiated by the countries with which they trade.
 
                        Securities rated BBB by Standard & Poor's Corporation
                      ("S&P") or Baa by Moody's Investors Service, Inc.
                      ("Moody's") are deemed by these ratings services to have
                      some speculative characteristics and adverse economic
                      conditions or other circumstances are more likely to lead
                      to a weakened capacity to make principal and interest
                      payments than is the case with higher grade bonds.
 

INVESTMENT              The International Equity Fund may not:
LIMITATIONS
                        1) Purchase securities of any one issuer, other than
                      obligations issued or guaranteed by the U.S. Government,
                      its agencies, or instrumentalities, and repurchase
                      agreements involving such securities if, immediately after
                      the purchase, more than 5% of the value of the Fund's
                      total assets would be invested in the issuer or the Fund
                      would hold more than 10% of any class of securities of the
                      issuer or more than 10% of the issuer's outstanding voting
                      securities (except that up to 25% of the value of the
                      Fund's total assets may be invested without regard to
                      these limitations). For purposes of this investment
                      limitation, each foreign governmental issuer is deemed a
                      separate issuer.
 
                        2) Purchase any securities that would cause more than
                      25% of the Fund's total assets at the time of purchase to
                      be invested in securities of one or more issuers
                      conducting their principal business activities in the same
                      industry, provided that (a) there is no limitation with
                      respect to obligations issued or guaranteed by the U.S. or
                      foreign governments or their agencies or instrumentalities
                      and repurchase
 
                                        9
<PAGE>   136
 
                      agreements secured by obligations of the U.S. Government
                      or its agencies or instrumentalities; (b) wholly owned
                      finance companies will be considered to be in the
                      industries of their parents if their activities are
                      primarily related to financing the activities of their
                      parents; and (c) utilities will be divided according to
                      their services (for example, gas, gas transmission,
                      electric and gas, electric, and telephone will each be
                      considered a separate industry);
 
                        3) Make loans, except that the Fund may purchase or hold
                      debt instruments, lend portfolio securities, and enter
                      into repurchase agreements in accordance with its
                      investment objective and policies.
 
                        The foregoing percentages will apply at the time of the
                      purchase of a security. The investment limitations listed
                      above are fundamental policies the substance of which may
                      not be changed without a vote of a majority of the
                      outstanding Shares of the Fund. Additional fundamental and
                      non-fundamental investment limitations are set forth in
                      the Statement of Additional Information.
 
                      Portfolio Turnover
 
                        The Fund's portfolio turnover rate will not be a factor
                      preventing a sale or purchase when the Advisor believes
                      investment considerations warrant. The Fund's portfolio
                      turnover rate may vary greatly from year to year as well
                      as within a particular year. High portfolio turnover rates
                      generally will result in correspondingly higher brokerage
                      and other transactions costs to the Fund and could involve
                      the realization of capital gains that would be taxable
                      when distributed to Shareholders of the Fund. See FEDERAL
                      TAXATION.
 
PURCHASE AND
REDEMPTION
OF SHARES               Fiduciary Shares may be purchased at net asset value.
                      Only the following investors qualify to purchase the
                      International Equity Fund's Fiduciary Shares: (i)
                      fiduciary, advisory, agency, custodial and other similar
                      accounts maintained with Union Bank of California, N.A. or
                      its affiliates; (ii) Select IRA accounts established with
                      The Bank of California, N.A. and invested in any of
                      HighMark's Equity or Income Funds prior to June 20, 1994,
                      which have remained continuously open thereafter and which
                      are not considered to be fiduciary accounts; (iii)
                      Shareholders who currently own Shares of HighMark's Equity
                      or Income Funds that were purchased prior to June 20, 1994
                      within an account registered in their name with the Funds;
                      and (iv) present and retired directors, officers and
                      employees (and their spouses and children under the age of
                      21) of Union Bank of California, N.A., HighMark's current
                      or former distributors or their respective affiliated
                      companies who currently own Shares of HighMark Funds which
                      were purchased before April 30, 1997.
 
                        Purchases and redemptions of Shares of the International
                      Equity Fund may be made on days on which both the New York
                      Stock Exchange and Federal Reserve
 
                                       10
<PAGE>   137
 
                      wire system are open for business ("Business Days"). The
                      minimum initial investment is generally $1,000 and the
                      minimum subsequent investment is generally only $100. For
                      present and retired directors, officers, and employees
                      (and their spouses and children under the age of 21) of
                      Union Bank of California, SEI Financial Services Company
                      and their affiliates, the minimum initial investment is
                      $250 and the minimum subsequent investment is $50. The
                      Fund's initial and subsequent minimum purchase amounts may
                      be waived if purchases are made in connection with
                      Individual Retirement Accounts, Keoghs, payroll deduction
                      plans, or 401(k) or similar plans. However, the minimum
                      investment may be waived in the Distributor's discretion.
                      Shareholders may place orders by telephone.
 
                        Purchase orders will be effective if the Distributor
                      receives an order before 1:00 p.m., Pacific time (4:00
                      p.m., Eastern time) and the custodian receives Federal
                      funds before the close of business on the next Business
                      Day. The purchase price of Shares of a Fund is the net
                      asset value next determined after a purchase order is
                      received and accepted by HighMark. The net asset value per
                      Share of a Fund is determined by dividing the total market
                      value of a Fund's investments and other assets, less any
                      liabilities, by the total number of outstanding Shares of
                      a Fund. Net asset value per share is determined daily as
                      of 1:00 p.m., Pacific time (4:00 p.m., Eastern time) on
                      any Business Day. Purchases will be made in full and
                      fractional shares of HighMark calculated to three decimal
                      places. HighMark reserves the right to reject a purchase
                      order when the Distributor determines that it is not in
                      the best interest of HighMark and/or its Shareholders to
                      accept such order.
 
                        Shares of the International Equity Fund are offered only
                      to residents of states in which the shares are eligible
                      for purchase.
 
                        Shareholders who desire to redeem shares of HighMark
                      must place their redemption orders prior to 1:00 p.m.,
                      Pacific time (4:00 p.m., Eastern time), on any Business
                      Day for the order to be accepted on that Business Day. The
                      redemption price is the net asset value of the Fund next
                      determined after receipt by the Distributor of the
                      redemption order. Payment on redemption will be made as
                      promptly as possible and, in any event, within seven
                      calendar days after the redemption order is received. The
                      Fund reserves the right to make payment for redemptions in
                      securities rather than cash.
 
                        Neither HighMark's transfer agent nor HighMark will be
                      responsible for any loss, liability, cost or expense for
                      acting upon wire instructions or upon telephone
                      instructions that it reasonably believes to be genuine.
                      HighMark and its transfer agent will each employ
                      reasonable procedures to confirm that telephone
                      instructions are genuine. Such procedures may include
                      taping of telephone conversations. If market conditions
                      are extraordinarily active or other extraordinary
 
                                       11
<PAGE>   138
 
                      circumstances exist, and you experience difficulties
                      placing redemption orders by telephone, you may wish to
                      consider placing your order by other means.
 
EXCHANGE
PRIVILEGES              As indicated under GENERAL INFORMATION--Description of
                      HighMark & Its Shares, certain of HighMark's Funds issue
                      two classes of Shares (Retail Shares and Fiduciary
                      Shares); as of the date of this Prospectus, the
                      Distribution Plan and distribution fee payable thereunder
                      are applicable only to such Fund's Retail Shares. A
                      Shareholder's eligibility to exchange into a particular
                      class of Shares will be determined at the time of the
                      exchange. The Shareholder must supply, at the time of the
                      exchange, the necessary information to permit confirmation
                      of qualification.
 
                        Each Fund's Shares may be exchanged for Shares of the
                      class of the various other Funds of HighMark which the
                      Shareholder qualifies to purchase directly so long as the
                      Shareholder maintains the applicable minimum account
                      balance in each Fund in which he or she owns Shares and
                      satisfies the minimum initial and subsequent purchase
                      amounts of the Fund into which the Shares are exchanged.
                      Shareholders may exchange their Fiduciary Shares for
                      Fiduciary Shares of another Fund on the basis of the
                      relative net asset value of the Fiduciary Shares
                      exchanged. Shareholders may also exchange Fiduciary Shares
                      of a Fund for Retail Shares of another Fund. Under such
                      circumstances, the cost of the acquired Retail Shares will
                      be the net asset value per share plus the appropriate
                      sales load.
 
                        Exchanges will be made on the basis of the relative net
                      asset values of the Shares exchanged plus any applicable
                      sales charge. Exchanges are subject to the terms and
                      conditions stated herein and the terms and conditions
                      stated in the respective prospectuses of the Funds.
 
                        Certain entities (including participating organizations
                      and Union Bank of California and its affiliates), however,
                      may charge customers a fee with respect to exchanges made
                      on the customer's behalf. Information about these charges,
                      if any, can be obtained by the entity effecting the
                      exchange and this Prospectus should be read in conjunction
                      with that information.
 
                        A Shareholder wishing to exchange Shares in the
                      International Equity Fund may do so by contacting the
                      transfer agent at 1-800-433-6884. Exchanges will be
                      effected on any Business Day at the net asset value of the
                      Funds involved in the exchange next determined after the
                      exchange request is received by the transfer agent.
 
                        An exchange is considered to be a sale of Shares for
                      federal income tax purposes on which a Shareholder may
                      realize a capital gain or loss. Exchange privileges may be
                      exercised only in those states where Shares of such other
                      Funds
 
                                       12
<PAGE>   139
 
                      of HighMark may legally be sold. HighMark may materially
                      amend or terminate the exchange privileges described
                      herein upon sixty days' notice.
 
DIVIDENDS               Substantially all of the net investment income
                      (exclusive of capital gains) of the Fund is periodically
                      declared and paid as a dividend to Shareholders of record.
                      Currently, capital gains of the Fund, if any, will be
                      distributed at least annually.
 
                        Shareholders will automatically receive all income
                      dividends and capital gains distributions in additional
                      full and fractional Shares of the Fund at net asset value
                      as of the date of declaration (which is also the
                      ex-dividend date), unless the Shareholder elects to
                      receive such dividends or distributions in cash.
                      Shareholders wishing to receive their dividends in cash
                      (or wishing to revoke a previously made election) must
                      notify the transfer agent at P.O. Box 8416, Boston, MA
                      02266-8416, and such election (or revocation thereof) will
                      become effective with respect to dividends and
                      distributions having record dates after notice has been
                      received. Dividends paid in additional Shares receive the
                      same tax treatment as dividends paid in cash.
 
FEDERAL
TAXATION                The International Equity Fund intends to qualify for
                      treatment as a "regulated investment company" under the
                      Internal Revenue Code of 1986, as amended (the "Code"),
                      and to distribute substantially all of its net investment
                      income and net realized capital gains so that the Fund is
                      not required to pay federal taxes on these amounts.
 
                        Distributions of ordinary income and/or an excess of net
                      short-term capital gain over net long-term capital loss
                      are treated for federal income tax purposes as ordinary
                      income to Shareholders. The 70 percent dividends received
                      deduction for corporations generally will apply to these
                      distributions to the extent the distribution represents
                      amounts that would qualify for the dividends received
                      deduction when received by the Fund if the Fund were a
                      regular corporation, and to the extent designated by the
                      Fund as so qualifying. Distributions by the Fund of the
                      excess of net long-term capital gain over net short-term
                      capital loss is taxable to Shareholders as long-term
                      capital gain in the year with respect to which it is
                      received, regardless of how long the Shareholder has held
                      Shares of the Fund. Such distributions are not eligible
                      for the dividends received deduction. If a Shareholder
                      disposes of Shares in the Fund at a loss before holding
                      such Shares for longer than six months, such loss will be
                      treated as a long-term capital loss to the extent the
                      Shareholder has received long-term capital gain dividends
                      on the Shares.
 
                        Prior to purchasing Shares of the International Equity
                      Fund, the impact of dividends or capital gain
                      distributions that are expected to be declared or have
 
                                       13
<PAGE>   140
 
                      been declared, but not paid, should be carefully
                      considered. Dividends or capital gain distributions
                      received after a purchase of Shares are subject to federal
                      income taxes, although in some circumstances, the
                      dividends or distributions may be, as an economic matter,
                      a return of capital to the Shareholder. A Shareholder
                      should consult his or her advisor for specific advice
                      about the tax consequences to the Shareholder of investing
                      in the Fund.
 
                        Fund investments in foreign securities may be subject to
                      withholding taxes at the source on dividend or interest
                      payments. In that case, the Fund's yield on those
                      securities would be decreased. If at the end of the Fund's
                      fiscal year more than 50% of the value of its total assets
                      represents securities of foreign corporations, the Fund
                      intends to make an election permitted by the Internal
                      Revenue Code to treat any foreign taxes paid by it as paid
                      by its Shareholders. In this case, Shareholders who are
                      U.S. citizens, U.S. corporations and, in some cases, U.S.
                      residents generally will be required to include in U.S.
                      taxable income their pro rata share of such taxes, but may
                      then generally be entitled to claim a foreign tax credit
                      or deduction (but not both) for their share of such taxes.
 
                        Fund transactions in foreign currencies and hedging
                      activities may give rise to ordinary income or loss to the
                      extent such income or loss results from fluctuations in
                      value of the foreign currency concerned. In addition, such
                      activities will likely produce a difference between book
                      income and taxable income. This difference may cause a
                      portion of the Fund's income distributions to constitute a
                      return of capital for tax purposes or require the Fund to
                      make distributions exceeding book income to qualify as a
                      regulated investment company for tax purposes.
 
                        Investment in an entity that qualifies as a "passive
                      foreign investment company" under the Code could subject
                      the Fund to a U.S. federal income tax or other charge on
                      certain "excess distributions" received with respect to
                      the investment, and on the proceeds from disposition of
                      the investment.
 
                        Additional information regarding federal taxes is
                      contained in the Statement of Additional Information.
                      However, the foregoing and the material in the Statement
                      of Additional Information are only brief summaries of some
                      of the important tax considerations generally affecting
                      the Fund and its Shareholders. In addition, the foregoing
                      discussion and the federal tax information in the
                      Statement of Additional Information are based on tax laws
                      and regulations which are in effect as of the date of this
                      Prospectus; these laws and regulations may subsequently
                      change, and such changes could be retroactive.
 
                        Shareholders will be advised at least annually as to the
                      federal income tax status of distributions made during the
                      year.
 
                                       14
<PAGE>   141
 
SERVICE
ARRANGEMENTS          The Advisor
 
                        Pacific Alliance Capital Management, a division of Union
                      Bank of California, N.A., serves as the International
                      Equity Fund's investment advisor. Subject to the general
                      supervision of HighMark's Board of Trustees, the Advisor
                      manages the Fund in accordance with its investment
                      objective and policies, makes decisions with respect to
                      and places orders for all purchases and sales of the
                      Fund's investment securities, and maintains the Fund's
                      records relating to such purchases and sales.
 
                        For the expenses assumed and services provided by the
                      Advisor as the Fund's investment advisor, Union Bank of
                      California receives a fee from the International Equity
                      Fund, computed daily and paid monthly, at the annual rate
                      of ninety-five one-hundredths of one percent (.95%) of the
                      Fund's average daily net assets. This fee may be higher
                      than the advisory fee paid by most mutual funds, although
                      the Board of Trustees believes it will be comparable to
                      advisory fees paid by many funds having similar objectives
                      and policies. Union Bank of California may from time to
                      time agree to voluntarily reduce its advisory fee,
                      however, it is not currently doing so. While there can be
                      no assurance that Union Bank of California will choose to
                      make such an agreement, any voluntary reductions in Union
                      Bank of California's advisory fee will lower the Fund's
                      expenses, and thus increase the Fund's yield and total
                      return, during the period such voluntary reductions are in
                      effect.
 
                        On April 1, 1996, the Bank of California, N.A.,
                      HighMark's then investment advisor, combined with Union
                      Bank and the resulting bank changed its name to Union Bank
                      of California, N.A. At the same time, the banks'
                      investment management divisions were combined. Each of
                      Union Bank and The Bank of California, N.A. (or their
                      predecessor banks) has been in banking since the early
                      1900's and, historically, each has had significant
                      investment functions within its trust and investment
                      division. UnionBanCal Corporation, the parent of Union
                      Bank of California, N.A., is a publicly held corporation,
                      but is principally held by The Bank of Tokyo-Mitsubishi,
                      Ltd. As of September 30, 1996, Union Bank of California
                      and its subsidiaries had approximately $28.7 billion in
                      commercial assets. Pacific Alliance Capital Management is
                      a division of Union Bank of California's Trust and
                      Investment Management Group which, as of June 30 1996, had
                      approximately $13.4 billion of assets under management.
                      The Advisor, with a team of approximately 45 stock and
                      bond research analysts, portfolio managers and traders,
                      has been providing investment management services to
                      individuals, institutions and large corporations since
                      1917.
 
                                       15
<PAGE>   142
 
                      The Sub-Advisor
 
                        The Advisor and Tokyo-Mitsubishi Asset Management
                      (U.K.), Ltd. (the "Sub-Advisor"), have entered into an
                      investment subadvisory agreement relating to the Fund (the
                      "Investment Sub-Advisory Agreement"). Under the Investment
                      Sub-Advisory Agreement, the Sub-Advisor makes the
                      day-to-day investment decisions for the assets of the
                      Fund, subject to the supervision of, and policies
                      established by, the Advisor and the Trustees of HighMark.
                      HighMark's Shares are not sponsored, endorsed or
                      guaranteed by and do not constitute obligations or
                      deposits of the Sub-Advisor and are not guaranteed by the
                      FDIC or any other governmental agency.
 
                        Tokyo-Mitsubishi Asset Management (U.K.), Ltd., 12-15
                      Finsbury Circus, London EC2 M7BT operates as a subsidiary
                      of The Bank of Tokyo-Mitsubishi, Ltd. Established in 1989,
                      the Sub-Advisor provides active global investment services
                      for segregated funds and specialist fund management.
 
                        Prior to February 1995 the Sub-Advisor had not
                      previously served as the investment advisor to mutual
                      funds. As of April 1, 1996 Tokyo-Mitsubishi Asset
                      Management (U.K.), Ltd., managed assets of $2.2 billion in
                      individual portfolios and collective funds.
 
                        The Sub-Advisor is entitled to a fee, which is
                      calculated daily and paid monthly out of the Advisor's
                      fee, at an annual rate of .30% of the average daily net
                      assets of the Fund.
 
                        Andrew Richmond has served as portfolio manager of the
                      Fund since its inception. Mr. Richmond has been with the
                      SubAdvisor and its predecessor, Bank of Tokyo Asset
                      Management (U.K.), Ltd., since 1990, and has served as
                      senior equity investment manager since June, 1992.
 
                      Administrator
 
                        SEI Fund Resources (the "Administrator") and HighMark
                      are parties to an administration agreement (the
                      "Administration Agreement"). Under the terms of the
                      Administration Agreement, the Administrator provides
                      HighMark with certain management services, including all
                      necessary office space, equipment, personnel, and
                      facilities.
 
                        The Administrator is entitled to a fee, which is
                      calculated daily and paid monthly, at an annual rate of
                      .20% of the average daily net assets of the Funds. The
                      Administrator may waive its fee or reimburse various
                      expenses to the extent necessary to limit the total
                      operating expenses of a Fund's Fiduciary Shares. Any such
                      waiver is voluntary and may be terminated at any time in
                      the Administrator's sole discretion. Currently, the
                      Administrator has agreed to waive its fee to the rate of
                      .18% of the average daily net assets of the Funds.
 
                                       16
<PAGE>   143
 
                        Pursuant to a separate agreement with the Administrator,
                      Union Bank of California, N.A. performs sub-administration
                      services on behalf of the Fund, for which it receives a
                      fee paid by the Administrator at the annual rate of up to
                      0.05% of the average daily net assets of the Fund. Union
                      Bank of California has voluntarily agreed to reduce this
                      fee to 0.03%, but reserves the right to terminate its
                      waiver at any time in its sole discretion. A description
                      of the services performed by Union Bank of California
                      pursuant to this Agreement is contained in the Statement
                      of Additional Information.
 
                      The Transfer Agent
 
                        State Street Bank and Trust Company serves as the
                      transfer agent, dividend disbursing agent, and as a
                      shareholder servicing agent for the Fiduciary Shares of
                      HighMark, for which services it receives a fee.
 
                      Shareholder Service Plan
 
                        To support the provision of Shareholder services to both
                      classes of Shares, HighMark has adopted a Shareholder
                      Service Plan. A description of the services performed by
                      service providers pursuant to the Shareholder Service Plan
                      is contained in the Statement of Additional Information.
                      In consideration of services provided by any service
                      provider, which may include Union Bank of California,
                      N.A., Bank of Tokyo-Mitsubishi, Ltd., or their respective
                      affiliates, the Fund may pay a fee at the rate of up to
                      0.25% of its average daily net assets to such service
                      provider. The service provider may waive such fees at any
                      time. Any such waiver is voluntary and may be terminated
                      at any time. Currently, such fees are being waived to the
                      rate of 0.00% of average daily net assets.
 
                      Distributor
 
                        SEI Financial Services Company (the "Distributor") and
                      HighMark are parties to a distribution agreement
                      ("Distribution Agreement"). The Distribution Agreement is
                      renewable annually and may be terminated by the
                      Distributor, by a majority vote of the Disinterested
                      Trustees or by a majority vote of the outstanding
                      securities of HighMark upon not more than 60 days written
                      notice by either party, or upon assignment by the
                      Distributor. Fiduciary Shares are not subject to
                      HighMark's Distribution Plan or a distribution fee.
 
                      Banking Laws
 
                        Union Bank of California believes that it may perform
                      the services for the Fund contemplated by its investment
                      advisory agreement with HighMark without a violation of
                      applicable banking laws and regulations. Union Bank of
                      California also believes that it may perform
                      sub-administration and sub-accounting services on behalf
                      of the Fund without a violation of applicable banking laws
                      and regulations. Future changes in federal or state
                      statutes and regulations relating to
 
                                       17
<PAGE>   144
 
                      permissible activities of banks or bank holding companies
                      and their subsidiaries and affiliates, as well as further
                      judicial or administrative decisions or interpretations of
                      present and future statutes and regulations, could change
                      the manner in which Union Bank of California or the
                      Advisor could continue to perform such services for the
                      Fund. For a further discussion of applicable banking laws
                      and regulations, see the Statement of Additional
                      Information.
 
                      Custodian
 
                        Union Bank of California also serves as the custodian
                      and as a shareholder servicing agent for the International
                      Equity Fund. The custodian holds cash, securities and
                      other assets of HighMark as required by the 1940 Act.
 
                        Services performed by Union Bank of California, as the
                      Fund's shareholder servicing agent and custodian, as well
                      as the basis of remuneration for such services, are
                      described in the Statement of Additional Information.
 
GENERAL
INFORMATION           Description of HighMark & Its Shares
 
                        HighMark was organized as a Massachusetts business trust
                      on March 10, 1987, and consists of sixteen series of
                      Shares open for investment representing units of
                      beneficial interest in HighMark's Growth Fund, Income
                      Equity Fund, Balanced Fund, Value Momentum Fund, Blue Chip
                      Growth Fund, Emerging Growth Fund, International Equity
                      Fund, Bond Fund, Intermediate-Term Bond Fund, Government
                      Securities Fund, Convertible Securities Fund, California
                      Intermediate Tax-Free Bond Fund, Diversified Money Market
                      Fund, U.S. Government Obligations Money Market Fund, 100%
                      U.S. Treasury Obligations Money Market Fund, and
                      California Tax-Free Money Market Fund. As of the date
                      hereof, no Shares of the Value Momentum Fund, the Blue
                      Chip Growth Fund, the Emerging Growth Fund, the
                      International Equity Fund, the Intermediate-Term Bond
                      Fund, the Convertible Securities Fund, the Government
                      Securities Fund and the California Intermediate Tax-Free
                      Bond Fund had been offered for sale in HighMark. Shares of
                      each Fund are freely transferable, are entitled to
                      distributions from the assets of the Fund as declared by
                      the Board of Trustees, and, if HighMark were liquidated,
                      would receive a pro rata share of the net assets
                      attributable to that Fund. Shares are without par value.
 
                        As noted above, pursuant to a Multiple Class Plan on
                      file with the Securities and Exchange Commission
                      permitting the issuance and sale of two classes of Shares
                      in selected Funds, Shares of such Funds have been divided
                      into two classes, designated Retail Shares and Fiduciary
                      Shares. For information regarding the Retail Shares,
                      interested persons may contact the Distributor at
                      1-800-433-6884.
 
                                       18
<PAGE>   145
 
                      Performance Information
 
                        From time to time, HighMark may advertise the aggregate
                      total return, average annual total return, yield and
                      distribution rate with respect to the Fiduciary Shares of
                      the International Equity Fund.
 
                        The aggregate total return and average annual total
                      return of the Fund may be quoted for the life of the Fund
                      and for ten-year, five-year, three-year, and one-year
                      periods, in each case through the most recent calendar
                      quarter. Aggregate total return is determined by
                      calculating the change in the value of a hypothetical
                      $1,000 investment in the Fund over the applicable period
                      that would equate the initial amount invested to the
                      ending redeemable value of the investment. The ending
                      redeemable value includes dividends and capital gain
                      distributions reinvested at net asset value. Average
                      annual total return is calculated by annualizing the
                      Fund's aggregate total return over the relevant number of
                      years. The resulting percentage indicates the average
                      positive or negative investment results that an investor
                      in the Fund would have experienced on an annual basis from
                      changes in Share price and reinvestment of dividends and
                      capital gain distributions.
 
                        The yield of the Fund is determined by annualizing the
                      net investment income per Share of the Fund during a
                      specified thirty-day period and dividing that amount by
                      the per Share public offering price of the Fund on the
                      last day of the period.
 
                        The distribution rate of the Fund is determined by
                      dividing the income and capital gains distributions, or
                      where indicated the income distributions alone, on a Share
                      of the Fund over a twelve-month period by the per Share
                      public offering price of the Fund on the last day of the
                      period.
 
                        Each Fund may periodically compare its performance to
                      the performance of other mutual funds tracked by mutual
                      fund rating services (such as Lipper Analytical);
                      financial and business publications and periodicals; broad
                      groups of comparable mutual funds; unmanaged indices which
                      may assume investment of dividends but generally do not
                      reflect deductions for administrative and management
                      costs, or other investment alternatives. Certain Funds may
                      advertise performance that includes results from periods
                      in which the Fund's assets were managed in a
                      non-registered predecessor vehicle.
 
                        All performance information presented for the Fund is
                      based on past performance and does not predict future
                      performance.
 
                      Miscellaneous
 
                        Shareholders will be sent unaudited semi-annual reports
                      and annual reports audited by independent public
                      accountants.
 
                                       19
<PAGE>   146
 
                        Shareholders are entitled to one vote for each Share
                      held in a Fund as determined on the record date for any
                      action requiring a vote by the Shareholders, and a
                      proportionate fractional vote for each fractional Share
                      held. Shareholders of HighMark will vote in the aggregate
                      and not by series or class except (i) as otherwise
                      expressly required by law or when HighMark's Board of
                      Trustees determines that the matter to be voted upon
                      affects only the interests of the Shareholders of a
                      particular series or particular class, and (ii) only
                      Retail Shares will be entitled to vote on matters
                      submitted to a Shareholder vote relating to the
                      Distribution Plan. HighMark is not required to hold
                      regular annual meetings of Shareholders, but may hold
                      special meetings from time to time.
 
                        HighMark's Trustees are elected by Shareholders, except
                      that vacancies may be filled by vote of the Board of
                      Trustees. Trustees may be removed by the Board of
                      Trustees, or by Shareholders at a meeting called for such
                      purpose. For information about how Shareholders may call
                      such a meeting and communicate with other Shareholders for
                      that purpose, see ADDITIONAL INFORMATION--Miscellaneous in
                      the Statement of Additional Information. Inquiries may be
                      directed in writing to SEI Financial Services Company,
                      Oaks, Pennsylvania 19456, or by calling toll free
                      1-800-433-6884.
 
DESCRIPTION OF
PERMITTED
INVESTMENTS             The following is a description of permitted investments
                      for the HighMark International Equity Fund.
 
                        AMERICAN DEPOSITARY RECEIPTS (ADRs) and EUROPEAN
                      DEPOSITARY RECEIPTS ("EDRs")--Receipts, typically issued
                      by a U.S. financial institution (a "depositary"), that
                      evidence ownership interests in a security or a pool of
                      securities issued by a foreign issuer and deposited with
                      the depositary. ADRs include American Depositary Shares
                      and New York Shares. EDRs, which are sometimes referred to
                      as Continental Depositary Receipts ("CDRs'), are receipts,
                      typically issued by a non-U.S. financial institution, that
                      evidence ownership interests in a security or a pool of
                      securities issued by either a U.S. or foreign issuer.
                      ADRs, EDRs and CDRs may be available for investment
                      through "sponsored" or "unsponsored" facilities. A
                      sponsored facility is established jointly by the issuer of
                      the security underlying the receipt and a depositary,
                      whereas an unsponsored facility may be established by a
                      depositary without participation by the issuer of the
                      receipt's underlying security. Holders of an unsponsored
                      depositary receipt generally bear all the costs of the
                      unsponsored facility. The depositary of an unsponsored
                      facility frequently is under no obligation to distribute
                      shareholder communications received from the issuer of the
                      deposited security or to pass through to the holders of
                      the receipts voting rights with respect to the deposited
                      securities.
 
                                       20
<PAGE>   147
 
                        ASSET-BACKED SECURITIES (NON-MORTGAGE)--Instruments
                      secured by company receivables, truck and auto loans,
                      leases, and credit card receivables. Such securities are
                      generally issued as pass-through certificates, which
                      represent undivided fractional ownership interests in the
                      underlying pools of assets. Such securities also may be
                      debt instruments, which are also known as collateralized
                      obligations and are generally issued as the debt of a
                      special purpose entity, such as a trust, organized solely
                      for the purpose of owning such assets and issuing such
                      debt. The purchase of non-mortgage assetbacked securities
                      raises risk considerations peculiar to the financing of
                      the instruments underlying such securities. Asset-backed
                      securities entail prepayment risk, which may vary
                      depending on the type of asset, but is generally less than
                      the prepayment risk associated with mortgage-backed
                      securities.
 
                        Like mortgages underlying mortgage-backed securities,
                      underlying automobile sales contracts or credit card
                      receivables are subject to substantial prepayment risk,
                      which may reduce the overall return to certificate
                      holders. Nevertheless, principal prepayment rates tend not
                      to vary as much in response to changes in interest rates
                      and the short-term nature of the underlying car loans or
                      other receivables tend to dampen the impact of any change
                      in the prepayment level. Certificate holders may also
                      experience delays in payment on the certificates if the
                      full amounts due on underlying sales contracts or
                      receivables are not realized by the trust because of
                      unanticipated legal or administrative costs of enforcing
                      the contracts or because of depreciation or damage to the
                      collateral (usually automobiles) securing certain
                      contracts, or other factors. If consistent with their
                      investment objectives and policies, the Fund may invest in
                      other asset-backed securities that may be developed in the
                      future.
 
                        BANKERS' ACCEPTANCES--Bills of exchange or time drafts
                      drawn on and accepted by commercial banks. They are used
                      by corporations to finance the shipment and storage of
                      goods and to furnish dollar exchange. Maturities are
                      generally six months or less.
 
                        CERTIFICATES OF DEPOSIT--Negotiable interest-bearing
                      instruments with a specific maturity. Certificates of
                      deposit are issued by banks and savings and loan
                      institutions in exchange for the deposit of funds and
                      normally can be traded in the secondary market prior to
                      maturity.
 
                        COMMERCIAL PAPER--Unsecured short-term promissory notes
                      issued by corporations and other entities. Maturities on
                      these issues vary from a few days to nine months. Purchase
                      of such instruments involves a risk of default by the
                      issuer.
 
                        CONVERTIBLE BONDS AND CONVERTIBLE PREFERRED STOCK--
                      Convertible Bonds are bonds convertible into a set number
                      of shares of another form of security (usually common
                      stock) at a prestated price. Convertible bonds
 
                                       21
<PAGE>   148
 
                      have characteristics similar to both fixed-income and
                      equity securities. Convertible preferred stock is a class
                      of capital stock that pays dividends at a specified rate
                      and that has preference over common stock in the payment
                      of dividends and the liquidation of assets. Convertible
                      preferred stock is preferred stock exchangeable for a
                      given number of common stock shares, and has
                      characteristics similar to both fixed-income and equity
                      securities. Because of the conversion feature, the market
                      value of convertible bonds and convertible preferred stock
                      tend to move together with the market value of the
                      underlying stock. As a result, a Fund's selection of
                      convertible bonds and convertible preferred stock is
                      based, to a great extent, on the potential for capital
                      appreciation that may exist in the underlying stock. The
                      value of convertible bonds and convertible preferred stock
                      is also affected by prevailing interest rates, the credit
                      quality of the issuer and any call provisions.
 
                        DERIVATIVES--Instruments whose value is derived from an
                      underlying contract, index or security, or any combination
                      thereof, including futures, options (e.g., puts and
                      calls), options on futures, swap agreements, and some
                      mortgage-backed securities (CMOs, REMICs, IOs and POs).
                      See elsewhere in this "DESCRIPTION OF PERMITTED
                      INVESTMENTS" for discussions of these various instruments,
                      and see "INVESTMENT OBJECTIVES" and "INVESTMENT POLICIES"
                      for more information about any policies and limitations
                      applicable to their use.
 
                        FORWARD FOREIGN CURRENCY CONTRACTS--The Fund may conduct
                      its foreign currency exchange transactions on a spot
                      (i.e., cash) basis at the spot rate prevailing in the
                      foreign currency exchange market or through entering into
                      forward currency contracts to protect against uncertainty
                      in the level of future exchange rates between particular
                      currencies or between foreign currencies in which the
                      Fund's securities are or may be denominated. A forward
                      contract involves an obligation to purchase or sell a
                      specific currency amount at a future date, which may be
                      any fixed number of days from the date of the contract,
                      agreed upon by the parties, at a price set at the time of
                      the contract. Under normal circumstances, consideration of
                      the prospect for changes in currency exchanges rates will
                      be incorporated into the Fund's long-term investment
                      strategies. However, the Advisor and Sub-Advisor believe
                      that it is important to have the flexibility to enter into
                      forward currency contracts when it determines that the
                      best interests of the Fund will be served.
 
                        When the Advisor and Sub-Advisor believe that the
                      currency of a particular country may suffer a significant
                      decline against another currency, the Fund may enter into
                      a currency contract to sell, for the appropriate currency,
                      the amount of foreign currency approximating the value of
                      some or all of the Fund's securities denominated in such
                      foreign currency.
 
                                       22
<PAGE>   149
 
                        At the maturity of a forward contract, the Fund may
                      either sell a fund security and make delivery of the
                      foreign currency, or it may retain the security and
                      terminate its contractual obligations to deliver the
                      foreign currency by purchasing an "offsetting" contract
                      with the same currency trader, obligating it to purchase
                      on the same maturity date, the same amount of the foreign
                      currency. The Fund may realize a gain or loss from
                      currency transactions.
 
                        FUTURES AND OPTIONS ON FUTURES--Some futures strategies,
                      including selling futures, buying puts and writing calls,
                      reduce a Fund's exposure to price fluctuations. Other
                      strategies, including buying futures, writing puts and
                      buying calls, tend to increase market exposure. Futures
                      and options may be combined with each other in order to
                      adjust the risk and return characteristics of the overall
                      portfolio.
 
                        Options and futures can be volatile instruments, and
                      involve certain risks that, if applied at an inappropriate
                      time, could negatively impact a Fund's return.
 
                        INVESTMENT GRADE BONDS--Interest-bearing or discounted
                      government or corporate securities that obligate the
                      issuer to pay the bondholder a specified sum of money,
                      usually at specific intervals, and to repay the principal
                      amount of the loan at maturity. Investment grade bonds are
                      those rated BBB or better by S&P or Baa or better by
                      Moody's or similarly rated by other NRSROs, or, if not
                      rated, determined to be of comparable quality by the
                      Advisor.
 
                        MONEY MARKET INSTRUMENTS--Short-term, debt instruments
                      or deposits and may include, for example, (i) commercial
                      paper rated within the highest rating category by a NRSRO
                      at the time of investment, or, if not rated, determined by
                      the Advisor to be of comparable quality; (ii) obligations
                      (certificates of deposit, time deposits, bank master
                      notes, and bankers' acceptances) of thrift institutions,
                      savings and loans, U.S. commercial banks (including
                      foreign branches of such banks), and U.S. and foreign
                      branches of foreign banks, provided that such institutions
                      (or, in the case of a branch, the parent institution) have
                      total assets of $1 billion or more as shown on their last
                      published financial statements at the time of investment;
                      (iii) short-term corporate obligations rated within the
                      three highest rating categories by a NRSRO (e.g., at least
                      A by S&P or A by Moody's) at the time of investment, or,
                      if not rated, determined by the Advisor to be of
                      comparable quality; (iv) general obligations issued by the
                      U.S. Government and backed by its full faith and credit,
                      and obligations issued or guaranteed as to principal and
                      interest by agencies or instrumentalities of the U.S.
                      Government (e.g., obligations issued by Farmers Home
                      Administration, Government National Mortgage Association,
                      Federal Farm Credit Bank and Federal Housing
                      Administration); (v) receipts, including TRs, TIGRs and
                      CATS; (vi) repurchase agreements involving such
                      obligations; (vii) loan participations issued by a bank in
                      the United States with assets exceeding $1 billion and for
 
                                       23
<PAGE>   150
 
                      which the underlying loan is issued by borrowers in whose
                      obligations the Fund may invest; (viii) money market funds
                      and (ix) foreign commercial paper.
 
                        Certain of the obligations in which a Fund may invest
                      may be variable or floating rate instruments, may involve
                      conditional or unconditional demand features and may
                      include variable amount master demand notes.
 
                        OBLIGATIONS OF SUPRANATIONAL ENTITIES--Obligations of
                      supranational entities are established through the joint
                      participation of several governments, and include the
                      Asian Development Bank, the Inter-American Development
                      Bank, International Bank for Reconstruction and
                      Development (World Bank), African Development Bank,
                      European Economic Community, European Investment Bank and
                      the Nordic Investment Bank.
 
                        OPTIONS--Under a call option, the purchaser of the
                      option has the right to purchase, and the writer (the
                      Fund) the obligation to sell, the underlying security at
                      the exercise price during the option period. A put option
                      gives the purchaser the right to sell, and the writer the
                      obligation to purchase, the underlying security at the
                      exercise price during the option period.
 
                        In addition, certain Funds may buy options on stock
                      indices to invest cash on an interim basis. Such options
                      will be listed on a national securities exchange. In order
                      to close out an option position, a Fund may enter into a
                      "closing purchase transaction"--the purchase of an option
                      on the same security with the same exercise price and
                      expiration date as the option contract previously written
                      on any particular security. When the security is sold, a
                      Fund effects a closing purchase transaction so as to close
                      out any existing option on that security.
 
                        There are risks associated with such investments
                      including the following: (1) the success of a hedging
                      strategy may depend on the ability of the Advisor or
                      Sub-Advisor to predict movements in the prices of
                      individual securities, fluctuations in markets and
                      movements in interest rates; (2) there may be an imperfect
                      correlation between the movement in prices of securities
                      held by a Fund and the price of options; (3) there may not
                      be a liquid secondary market for options; and (4) while a
                      Fund will receive a premium when it writes covered call
                      options, it may not participate fully in a rise in the
                      market value of the underlying security.
 
                        OPTIONS ON CURRENCIES--The Fund may purchase options and
                      write covered call options on foreign currencies (traded
                      on U.S. and foreign exchanges or over-the-counter markets)
                      to manage the Fund's exposure to changes in dollar
                      exchange rates. Call options on foreign currency written
                      by the Fund will be "covered" which means that the Fund
                      will own an equal amount of the underlying foreign
                      currency. With respect to put options on foreign currency
                      written by the Fund, the Fund will establish a segregated
                      account with its Custodian consisting of cash, U.S.
                      government securities or other liquid high
 
                                       24
<PAGE>   151
 
                      grade debt securities in an amount of equal to the amount
                      the Fund would be required to pay upon exercise of the
                      put.
 
                        RECEIPTS--Interests in separately traded interest and
                      principal component parts of U.S. Treasury obligations
                      that are issued by banks and brokerage firms and are
                      created by depositing Treasury notes and Treasury bonds
                      into a special account at a custodian bank. The custodian
                      holds the interest and principal payments for the benefit
                      of the registered owners of the certificates of such
                      receipts. The custodian arranges for the issuance of the
                      certificates or receipts evidencing ownership and
                      maintains the register. Receipts include "Treasury
                      Receipts" ("TR's"), "Treasury Investment Growth Receipts"
                      ("TIGR's"), and "Certificates of Accrual on Treasury
                      Securities" ("CATS"). TR's, TIGR's and CATS are sold as
                      zero coupon securities, which means that they are sold at
                      a substantial discount and redeemed at face value at their
                      maturity date without interim cash payments of interest or
                      principal. This discount is accreted over the life of the
                      security, and such accretion will constitute the income
                      earned on the security for both accounting and tax
                      purposes. Because of these features, such securities may
                      be subject to greater interest rate volatility than
                      interest-paying securities. See also "FEDERAL TAXATION."
 
                        REPURCHASE AGREEMENTS--Agreements whereby a Fund will
                      acquire securities from approved financial institutions or
                      registered broker-dealers that agree to repurchase the
                      securities at a mutually agreed-upon date and price. The
                      repurchase agreements entered into by the Funds will
                      provide that the underlying security at all times shall
                      have a value equal to 102% of the resale price stated in
                      the agreement. Repurchase agreements involving government
                      securities are not subject to a Fund's fundamental
                      investment limitation on purchasing securities of any one
                      issuer. If the seller defaults on its repurchase
                      obligation or becomes insolvent, the Fund holding such
                      obligations would suffer a loss to the extent that either
                      the proceeds from a sale of the underlying portfolio
                      securities were less than the repurchase price or the
                      Fund's disposition of the securities was delayed pending
                      court action. Securities subject to repurchase agreements
                      will be held by a qualified custodian or in the Federal
                      Reserve/Treasury book-entry system. Repurchase agreements
                      are considered to be loans by a Fund under the Investment
                      Company Act of 1940 (the "1940 Act").
 
                        REVERSE REPURCHASE AGREEMENTS--A Fund may borrow funds
                      for temporary purposes by entering into reverse repurchase
                      agreements, provided such action is consistent with the
                      Fund's investment objective and fundamental investment
                      restrictions; as a matter of non-fundamental policy, each
                      Fund intends to limit such investments to no more than 10%
                      of the value of its total assets. Pursuant to a reverse
                      repurchase agreement, a Fund will sell portfolio
                      securities to financial institutions such as banks or to
                      broker-dealers, and agree to repurchase
 
                                       25
<PAGE>   152
 
                      the securities at a mutually agreed-upon date and price. A
                      Fund intends to enter into reverse repurchase agreements
                      only to avoid otherwise selling securities during
                      unfavorable market conditions to meet redemptions. At the
                      time a Fund enters into a reverse repurchase agreement, it
                      will place in a segregated custodial account assets such
                      as U.S. Government securities or other liquid,
                      high-quality debt securities consistent with the Fund's
                      investment objective having a value equal to 102% of the
                      repurchase price (including accrued interest), and will
                      subsequently monitor the account to ensure that an
                      equivalent value is maintained. Reverse repurchase
                      agreements involve the risk that the market value of the
                      securities sold by a Fund may decline below the price at
                      which a Fund is obligated to repurchase the securities.
                      Reverse repurchase agreements are considered to be
                      borrowings by a Fund under the 1940 Act.
 
                        RULE 144A SECURITIES--Rule 144A Securities are
                      securities that have not been registered under the
                      Securities Act of 1933, but which may be traded between
                      certain qualified institutional investors, including
                      investment companies. The absence of a secondary market
                      may affect the value of the Rule 144A Securities. The
                      Board of Trustees of HighMark has established guidelines
                      and procedures to be utilized to determine the liquidity
                      of such securities.
 
                        SECURITIES ISSUED ON A FORWARD COMMITMENT BASIS OR
                      WHEN-ISSUED SECURITIES--Securities purchased for delivery
                      beyond the normal settlement date at a stated price and
                      yield and which thereby involve a risk that the yield
                      obtained in the transaction will be less than that
                      available in the market when delivery takes place. When a
                      Fund agrees to purchase when-issued securities or enter
                      into forward commitments, HighMark's custodian will be
                      instructed to set aside cash or liquid portfolio
                      securities equal to the amount of the commitment in a
                      segregated account. A Fund will generally not pay for such
                      securities and no income will accrue on the securities
                      until they are received. These securities are recorded as
                      an asset and are subject to changes in value based upon
                      changes in the general level of interest rates. Therefore,
                      the purchase of securities on a "when-issued" basis or
                      forward commitments may increase the risk of fluctuations
                      in a Fund's net asset value.
 
                        SECURITIES LENDING--During the time portfolio securities
                      are on loan from a Fund, the borrower will pay the Fund
                      any dividends or interest paid on the securities. In
                      addition, loans will be subject to termination by the Fund
                      or the borrower at any time and, while a Fund will
                      generally not have the right to vote securities on loan,
                      it will terminate the loan and regain the right to vote if
                      that is considered important with respect to the
                      investment. While the lending of securities may subject a
                      Fund to certain risks, such as delays or an inability to
                      regain the securities in the event the borrower were to
                      default on its lending agreement or enter into bankruptcy,
                      a Fund will receive 100% collateral in the
 
                                       26
<PAGE>   153
 
                      form of cash or U.S. Government securities. This
                      collateral will be valued daily by the lending agent, with
                      oversight by the Advisor, and, should the market value of
                      the loaned securities increase, the borrower will be
                      required to furnish additional collateral to the Fund.
 
                        SECURITIES SUBJECT TO A PUT FEATURE--A "put" feature
                      permits a Fund to sell a fixed income security at a fixed
                      price prior to maturity. The underlying fixed income
                      securities subject to a put may be sold at any time at the
                      market rates. However, unless the put was an integral part
                      of the fixed income security as originally issued, it may
                      not be marketable or assignable. Generally, a premium is
                      paid for a put feature or a put feature is purchased
                      separately which results in a lower yield than would
                      otherwise be available for the same fixed income
                      securities.
 
                        STANDARD & POOR'S DEPOSITARY RECEIPTS (SPDRs)--SPDRs are
                      interests in a unit investment trust holding a portfolio
                      of securities linked to the S&P 500 Index. SPDRs closely
                      track the underlying portfolio of securities, trade like a
                      share of common stock and pay periodic dividends
                      proportionate to those paid by the portfolio of stocks
                      that constitutes the S&P 500 Index. For further
                      information regarding SPDRs, see the Statement of
                      Additional Information.
 
                        TIME DEPOSITS--Non-negotiable receipts issued by U.S. or
                      foreign banks in exchange for the deposit of funds. Like
                      certificates of deposit, they earn a specified rate of
                      interest over a definite period of time; however, they
                      cannot be traded in the secondary market. Time deposits
                      with a withdrawal penalty are considered to be illiquid
                      securities.
 
                        U.S. GOVERNMENT AGENCY SECURITIES--Certain Federal
                      agencies have been established as instrumentalities of the
                      U.S. Government to supervise and finance certain types of
                      activities. Issues of these agencies, while not direct
                      obligations of the U.S. Government, are either backed by
                      the full faith and credit of the United States (e.g., GNMA
                      securities) or supported by the issuing agencies' right to
                      borrow from the U.S. Treasury. The issues of other
                      agencies are supported only by the credit of the
                      instrumentality (e.g., FNMA securities).
 
                        U.S. TREASURY OBLIGATIONS--Bills, notes, and bonds
                      issued by the U.S. Treasury, as well as separately traded
                      interest and principal component parts of such obligations
                      known as Separately Traded Registered Interest and
                      Principal Securities ("STRIPS") that are transferable
                      through the Federal book-entry system.
 
                        U.S. Government Securities generally do not involve the
                      credit risks associated with investments in other types of
                      fixed-income securities, although, as a result, the yields
                      available from U.S. Government Securities are generally
                      lower than the yields available from otherwise comparable
                      corporate fixed-income securities.
 
                                       27
<PAGE>   154
 
                      Like other fixed-income securities, however, the values of
                      U.S. Government Securities change as interest rates
                      fluctuate. Fluctuations in the value of portfolio
                      securities will in many cases not affect interest income
                      on existing portfolio securities, but will be reflected in
                      the Fund's net asset value. Because the magnitude of these
                      fluctuations will generally be greater at times when a
                      Fund's average maturity is longer, under certain market
                      conditions the Fund may invest in short-term investments
                      yielding lower current income rather than investing in
                      higher yielding longer-term securities.
 
                        VARIABLE AND FLOATING RATE INSTRUMENTS--Obligations that
                      may carry variable or floating rates of interest, may
                      involve conditional or unconditional demand features and
                      may include variable amount master demand notes. The
                      interest rates on these securities may be reset daily,
                      weekly, quarterly or some other reset period, and may have
                      a floor or ceiling on interest rate changes. There is a
                      risk that the current interest rate on such obligations
                      may not accurately reflect existing market interest rates.
                      A demand instrument with a demand notice period exceeding
                      seven days may be considered illiquid if there is no
                      secondary market for such security.
 
                        WARRANTS--Securities that entitle the holder to buy a
                      proportionate amount of common stock at a specified price
                      for a limited or unlimited period of time. Warrants are
                      often freely transferable and are traded on major stock
                      exchanges.
 
                        YANKEE BONDS--Dollar denominated securities issued by
                      foreign-domiciled issuers that obligate the issuer to pay
                      the bondholder a specified sum of money, usually
                      semiannually, and to repay the principal amount of the
                      loan at maturity. Sovereign bonds are bonds issued by the
                      governments of foreign countries. Supranational bonds are
                      those issued by supranational entities, such as the World
                      Bank and European Investment Bank. Canadian bonds are
                      bonds issued by Canadian provinces.
 
                        ZERO-COUPON OBLIGATIONS--Non-income producing securities
                      evidencing ownership of future interest and principal
                      payments on bonds. These obligations pay no current
                      interest and are typically sold at prices greatly
                      discounted from par value. The return on a zero-coupon
                      obligation, when held to maturity, equals the difference
                      between the par value and the original purchase price.
 
                        For federal income tax purposes, the difference between
                      the par value and the original issue price (original issue
                      discount) is included in the income of a holder of a
                      zero-coupon obligation over the term of the obligation
                      even though the interest is not paid until maturity. The
                      amount included in income is determined under a constant
                      interest rate method. In addition, if an obligation is
                      purchased subsequent to its original issue, a holder such
                      as the Income Funds may elect to include market discount
                      in income currently on a ratable accrual method or a
 
                                       28
<PAGE>   155
 
                      constant interest rate method. Market discount is the
                      difference between the obligation's "adjusted issue price"
                      (the original issue price plus original issue discount
                      accrued to date) and the holder's purchase price. If no
                      such election is made, gain on the disposition of a market
                      discount obligation is treated as ordinary income (rather
                      than capital gain) to the extent it does not exceed the
                      accrued market discount.
 
                        Zero-coupon obligations have greater price volatility
                      than other fixed-income obligations of similar maturity
                      and such obligations will be purchased when the yield
                      spread, in light of the obligation's duration, is
                      considered advantageous.
 
                                       29
<PAGE>   156
 
                       HighMark INTERNATIONAL EQUITY FUND
                            INVESTMENT PORTFOLIO OF
                                 HighMark FUNDS
                   For further information (including current
                  yield, purchase and redemption information),
                             call 1-(800) 433-6884
 
INVESTMENT ADVISOR
Pacific Alliance Capital Management,
a division of Union Bank of California, N.A.
475 Sansome Street
Post Office Box 45000
San Francisco, CA 94104
 
SUB-ADVISOR
Tokyo-Mitsubishi Asset Management (U.K.), Ltd.
12-15 Finsbury Circus
London EC2 M7BT
 
CUSTODIAN
Union Bank of California, N.A.
475 Sansome Street
Post Office Box 45000
San Francisco, CA 94104
 
ADMINISTRATOR & DISTRIBUTOR
SEI Fund Resources and
SEI Financial Services Company
Oaks, Pennsylvania 19456
 
LEGAL COUNSEL
Ropes & Gray
One Franklin Square
1301 K Street, N.W., Suite 800 East
Washington, D.C. 20005
 
AUDITORS
Deloitte & Touche LLP
1700 Courthouse Plaza Northeast
Dayton, OH 45402
<PAGE>   157
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR
     MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT
     BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR
     THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE
     UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS
     OF ANY SUCH STATE.
 
                             SUBJECT TO COMPLETION
 
                                 HIGHMARK FUNDS
 
                          CONVERTIBLE SECURITIES FUND
 
  HighMark Funds ("HighMark") is an open-end, diversified, registered investment
company that offers a convenient means of investing in one or more
professionally managed portfolios of securities. This Prospectus relates to
HighMark's Convertible Securities Fund.
 
                                FIDUCIARY SHARES
 
  HighMark's Fiduciary Shares are offered to the following investors: (i)
fiduciary, advisory, agency, custodial and other similar accounts maintained
with Union Bank of California, N.A. or its affiliates; (ii) SelectIRA accounts
established with The Bank of California, N.A. and invested in any of HighMark's
Equity or Fixed Income Funds prior to June 20, 1994, which have remained
continuously open thereafter and which are not considered to be fiduciary
accounts; (iii) Shareholders who currently own Shares of HighMark's Equity or
Fixed Income Funds that were purchased prior to June 20, 1994 within an account
registered in their name with the Funds; and (iv) present and retired directors,
officers and employees (and their spouses and children under the age of 21) of
Union Bank of California, N.A., HighMark's current or former distributors or
their respective affiliated companies who currently own Shares of HighMark Funds
which were purchased before April 30, 1997.
 
  This Prospectus sets forth concisely the information about HighMark and the
Convertible Securities Fund that a prospective investor should know before
investing. Investors are advised to read this Prospectus and retain it for
future reference. A Statement of Additional Information dated the same date as
this Prospectus has been filed with the Securities and Exchange Commission and
is available without charge by writing the Distributor, SEI Financial Services
Company, Oaks, Pennsylvania 19456, or by calling 1-800-433-6884. The Statement
of Additional Information is incorporated into this Prospectus by reference.
This Prospectus relates only to the Fiduciary Shares of the Convertible
Securities Fund. Interested persons who wish to obtain a prospectus for the
other Funds of HighMark may contact the Distributor at the above address and
telephone number.
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
HIGHMARK'S SHARES ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK, INCLUDING UNION BANK OF CALIFORNIA, N.A., BANK OF
TOKYO-MITSUBISHI, LIMITED OR ANY OF THEIR AFFILIATES OR CORRESPONDENTS.
HIGHMARK'S SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE
CORPORATION OR ANY OTHER GOVERNMENT AGENCY. INVESTMENT IN HIGHMARK INVOLVES
RISKS, INCLUDING POSSIBLE LOSS OF THE PRINCIPAL AMOUNT INVESTED.
 
February 26, 1997
Fiduciary Shares
<PAGE>   158
 
                                    SUMMARY
 
HIGHMARK FUNDS ("HIGHMARK") is an open-end, diversified, registered investment
company providing a convenient way to invest in professionally managed
portfolios of securities. The following provides basic information about the
Fiduciary Shares of the HighMark Convertible Securities Fund (the "Convertible
Securities Fund" or the "Fund"). This summary is qualified in its entirety by
reference to the more detailed information provided elsewhere in the Prospectus
and in the Statement of Additional Information.
 
WHAT IS THE FUND'S INVESTMENT OBJECTIVE? The Fund seeks a high level of current
income and capital appreciation by investing in convertible securities. (See
"INVESTMENT OBJECTIVE")
 
WHAT ARE THE FUND'S PERMITTED INVESTMENTS? The Fund invests primarily in
convertible securities, including bonds, debentures, notes and preferred stocks
convertible into common stock. (See "INVESTMENT POLICIES")
 
WHAT ARE THE RISKS INVOLVED WITH AN INVESTMENT IN THE FUND? The investment
policies of the Fund entail certain risks and considerations of which an
investor should be aware. The market value of the Fund's fixed income
investments will change in response to interest rate changes and other factors.
During periods of falling interest rates, the value of outstanding fixed income
securities generally rise. Conversely, during periods of rising interest rates,
the values of such securities generally decline. The Fund may invest up to 35%
of its assets in convertible bonds rated lower than Baa by Moody's Investors
Service, Inc. ("Moody's") or BBB by Standard & Poor's Corporation ("S&P") and as
low as Caa by Moody's or CCC by S&P, which are lower-quality, higher-yielding,
high-risk debt securities. (See "Risk Factors")
 
ARE MY INVESTMENTS INSURED? HighMark's Shares are not federally insured by the
FDIC or any other government agency. Any guarantee by the U.S. Government, its
agencies or any instrumentalities of the securities in which any Fund invests
guarantees only the payment of principal and interest on the guaranteed
security, and does not guarantee the total return or value of the security or
total return or value of Shares of that Fund.
 
WHO IS THE ADVISOR? Pacific Alliance Capital Management, a division of Union
Bank of California, N.A., serves as the Advisor to HighMark. (See "The Advisor")
 
WHO IS THE SUB-ADVISOR? Bank of Tokyo-Mitsubishi Trust Company serves as the
Sub-Advisor to the Convertible Securities Fund. (See "The Sub-Advisor")
 
WHO IS THE ADMINISTRATOR? SEI Fund Resources serves as the Administrator of
HighMark. (See "The Administrator")
 
WHO IS THE CUSTODIAN? Union Bank of California, N.A., (the "Bank") serves as the
custodian of HighMark's assets. (See "The Custodian")
 
WHO IS THE DISTRIBUTOR? SEI Financial Services Company acts as distributor of
HighMark's Shares. (See "The Distributor")
 
HOW DO I PURCHASE AND REDEEM SHARES? Purchases and redemptions may be made
through the Distributor on days on which both the New York Stock Exchange and
the Federal Reserve wire system are open for
 
                                        2
<PAGE>   159
 
business ("Business Days"). The minimum initial investment is generally $1,000.
A purchase order will be effective if the Distributor receives an order prior to
1:00 p.m., Pacific time (4:00 p.m., Eastern time). Purchase orders for Shares
will be executed at a per Share price equal to the asset value next determined
after the purchase order is effective. Redemption orders must be placed prior to
1:00 p.m., Pacific time (4:00 p.m., Eastern time) on any Business Day for the
order to be effective that day. (See "PURCHASE AND REDEMPTION OF SHARES")
 
HOW ARE DIVIDENDS PAID? Substantially all of the net investment income
(exclusive of capital gains) of the Fund is distributed in the form of monthly
dividends to Shareholders of record. Any capital gain is distributed at least
annually. Distributions are paid in additional Shares unless the Shareholder
elects to take the payment in cash. (See "DIVIDENDS")
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
Summary................................................................................   2
Convertible Securities Fund Fee Table..................................................   4
Fund Description.......................................................................   5
Investment Objective...................................................................   5
Investment Policies....................................................................   5
General................................................................................   6
 Money Market Instruments..............................................................   6
 Illiquid and Restricted Securities....................................................   6
 Lending of Portfolio Securities.......................................................   7
 Other Investments.....................................................................   7
 Risk Factors..........................................................................   8
 Risks Associated with Convertible Securities..........................................   9
Investment Limitations.................................................................   9
 Portfolio Turnover....................................................................  10
Purchase and Redemption of Shares......................................................  10
Exchange Privileges....................................................................  12
Dividends..............................................................................  13
Federal Taxation.......................................................................  13
Service Arrangements...................................................................  14
 The Advisor...........................................................................  14
 The Sub-Advisor.......................................................................  15
 Administrator.........................................................................  16
 The Transfer Agent....................................................................  17
 Shareholder Service Plan..............................................................  17
 Distributor...........................................................................  17
 Banking Laws..........................................................................  17
 Custodian.............................................................................  18
General Information....................................................................  18
  Description of Highmark & Its Shares.................................................  18
  Performance Information..............................................................  18
  Miscellaneous........................................................................  19
Description of Permitted Investments...................................................  20
</TABLE>
 
                                        3
<PAGE>   160
 
                     CONVERTIBLE SECURITIES FUND FEE TABLE
 
<TABLE>
<CAPTION>
                                                                                                       CONVERTIBLE
                                                                                                     SECURITIES FUND
                                                                                                        FIDUCIARY
                                                                                                         SHARES
                                                                                                     ---------------
<S>                                                                                                  <C>
SHAREHOLDER TRANSACTION EXPENSES(A)
  Maximum Sales Load Imposed on Purchases (as a percentage of offering price)......................       0.00%
  Maximum Sales Load Imposed on Reinvested Dividends (as a percentage of offering price)...........          0%
  Deferred Sales Load (as a percentage of original purchase price or redemption proceeds, as                 0%
    applicable)....................................................................................
  Redemption Fees (as a percentage of amount redeemed, if applicable)(b)...........................          0%
  Exchange Fee(a)..................................................................................       $   0
ANNUAL OPERATING EXPENSES (as a percentage of net assets)
  Management Fees (after voluntary reduction)(c)...................................................       0.59%
  12b-1 Fees.......................................................................................       0.00%
  Other Expenses (after voluntary reduction)(d)....................................................       0.26%
                                                                                                            ---
  Total Fund Operating Expenses (after voluntary reduction)(e).....................................       0.85%
                                                                                                     ==============
</TABLE>
 
  EXAMPLE: You would pay the following expenses on a $1,000 investment, assuming
(1) 5% annual return and (2) redemption at the end of each time period.
 
<TABLE>
<CAPTION>
                                                                 1 YEAR   3 YEARS   5 YEARS   10 YEARS
                                                                 ------   -------   -------   --------
<S>                                                              <C>      <C>       <C>       <C>
Convertible Securities Fund Fiduciary Shares....................   $9       $27       $47       $105
</TABLE>
 
  The purpose of the tables above is to assist an investor in the Convertible
Securities Fund in understanding the various costs and expenses that a
Shareholder will bear directly or indirectly. For a more complete discussion of
the Fund's annual operating expenses, see SERVICE ARRANGEMENTS below. THE
FOREGOING EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE
EXPENSES. ACTUAL EXPENSES MAY BE GREATER OR LESS THAN THOSE SHOWN.
- ---------
 
(a) Certain entities (including Union Bank of California and its affiliates)
     making investments in the Convertible Securities Fund on behalf of their
     customers may charge customers fees for services provided in connection
     with the investment in, redemption of, and exchange of Shares. (See
     PURCHASE AND REDEMPTION OF SHARES, EXCHANGE PRIVILEGES, and SERVICE
     ARRANGEMENTS below)
 
(b) A wire redemption charge is deducted from the amount of a wire redemption
     payment made at the request of a Shareholder.
 
(c) Absent voluntary fee waivers, MANAGEMENT FEES would be .60% for the
     Fiduciary Shares of the Convertible Securities Fund.
 
(d) OTHER EXPENSES for the Convertible Securities Fund are based on the Fund's
     estimated expenses for the current fiscal year. Absent voluntary fee
     waivers, OTHER EXPENSES would be .53% for the Fiduciary Shares of the
     Convertible Securities Fund.
 
(e) Absent voluntary fee waivers, TOTAL FUND OPERATING EXPENSES would be: 1.13%
     for the Fiduciary Shares of the Convertible Securities Fund.
 
                                        4
<PAGE>   161
 
FUND
DESCRIPTION             HighMark Funds ("HighMark") is an open-end, diversified,
                      registered investment company that currently offers units
                      of beneficial interest ("Shares") in sixteen separate
                      investment portfolios ("Funds"). All of the Funds are
                      advised by Pacific Alliance Capital Management (the
                      "Advisor"), a division of Union Bank of California, N.A.
                      Shareholders may purchase Shares of selected Funds through
                      two separate classes (the "Retail" and "Fiduciary"
                      classes). These classes may have different sales charges
                      and other expenses, which may affect performance.
                      Information regarding HighMark's other Funds and other
                      classes is contained in separate prospectuses that may be
                      obtained from HighMark's Distributor, SEI Financial
                      Services Company, at Oaks, Pennsylvania 19456, or by
                      calling 1-800-433-6884.
 
                        For information concerning those investors who qualify
                      to purchase Fiduciary Shares, see PURCHASE AND REDEMPTION
                      OF SHARES below. (Fiduciary Shares may be hereinafter
                      referred to as "Shares.")
 
INVESTMENT
OBJECTIVE               The Convertible Securities Fund seeks a high level of
                      current income and capital appreciation by investing in
                      convertible securities.
 
                        The investment objective and certain of the investment
                      limitations of the Convertible Securities Fund may not be
                      changed without a vote of the holders of a majority of the
                      outstanding Shares of the Fund (as defined under GENERAL
                      INFORMATION--Miscellaneous below). There can be no
                      assurance that the Fund will achieve its investment
                      objective.
 
INVESTMENT
POLICIES                Under normal market conditions, at least 65% of the
                      Convertible Securities Fund's assets will be invested in
                      convertible securities consisting of bonds, debentures,
                      notes and preferred stocks each of which are convertible
                      into common stock. In general, a convertible security is a
                      fixed-income security such as a bond (which typically pays
                      a fixed annual rate of interest) or preferred stock (which
                      typically pays a fixed dividend), that may be converted at
                      a stated price within a specified period of time into a
                      specified number of shares of common stock of the issuing
                      company, or of a different company. A convertible security
                      may be subject to redemption by the issuer, but only after
                      a particular date and under certain circumstances
                      (including a specified price) established upon issue. If a
                      convertible security held by the Fund is called for
                      redemption, the Fund could be required to tender it for
                      redemption, convert it into the underlying common stock,
                      or sell it to a third party. Common stock received upon
                      conversion will be sold when, in the opinion of the
                      Sub-Advisor, it is advisable to do so.
 
                        Because of its conversion feature, the market value of
                      convertible preferred stock tends to move together with
                      the market value of the underlying common stock. As a
                      result, the Fund's selection of convertible securities is
                      based, to a great extent, on the potential for capital
                      appreciation that may exist in the underlying
 
                                        5
<PAGE>   162
 
                      common stocks. The value of convertible securities is also
                      affected by prevailing interest rates, the credit quality
                      of the issuer and any call provisions. Investments in
                      convertible securities generally entail less volatility
                      than investments in the common stocks of the same issuers.
                      Nevertheless, it is the fixed income component of these
                      securities that is often deemed by the ratings agencies to
                      be high risk or speculative. The Fund may invest up to 35%
                      of its assets in convertible bonds rated lower than Baa by
                      Moody's or BBB by S&P and as low as Caa by Moody's or CCC
                      by S&P, which are lower-quality, higher-yielding, high-
                      risk debt securities (commonly known as "junk bonds"). The
                      Fund may also invest in unrated convertible securities
                      which, in the Sub-Advisor's opinion, are of comparable
                      quality to such rated securities. See "Risk Factors."
 
                        In the event that a security owned by the Fund is
                      downgraded below the stated ratings categories, the
                      Advisor or SubAdvisor will take appropriate action with
                      regard to the security.
 
                        The Fund may invest any remaining assets in common
                      stocks; securities issued or guaranteed by the U.S.
                      government or its agencies or instrumentalities; corporate
                      bonds rated Baa or better by Moody's or BBB or better by
                      S&P (investment grade bonds); shares of other investment
                      companies with similar investment objectives; high grade
                      commercial paper; money market funds; money market
                      instruments and cash; floating and variable rate notes;
                      repurchase agreements; dollardenominated securities of
                      foreign issuers; and Standard and Poor's Depositary
                      Receipts ("SPDRs").
 
GENERAL               Money Market Instruments
 
                        Under normal market conditions, the Fund may invest up
                      to 35% of its total assets in money market instruments.
                      When market conditions indicate a temporary "defensive"
                      investment strategy as determined by the Advisor or Sub-
                      Advisor, the Fund may invest more than 35% of its total
                      assets in money market instruments. The Fund will not be
                      pursuing its investment objective to the extent that a
                      substantial portion of its assets are invested in money
                      market instruments.
 
                      Illiquid and Restricted Securities
 
                        The Fund shall limit investment in illiquid securities
                      to 15% or less of its net assets. Generally, an "illiquid
                      security" is any security that cannot be disposed of
                      promptly and in the ordinary course of business at
                      approximately the amount at which the Fund has valued the
                      instrument. The absence of a trading market can make it
                      difficult to ascertain the market value of illiquid
                      securities. The Fund may purchase restricted securities
                      which have not been registered under the Securities Act of
                      1933 (e.g., Rule 144A Securities and Section 4(2)
                      commercial paper)
 
                                        6
<PAGE>   163
 
                      subject to policies approved by the Board of Trustees. See
                      INVESTMENT RESTRICTIONS in the Statement of Additional
                      Information.
 
                      Lending of Portfolio Securities
 
                        In order to generate additional income, the Fund may
                      lend its portfolio securities to broker-dealers, banks or
                      other institutions. The Fund may lend portfolio securities
                      in an amount representing up to 33 1/3% of the value of
                      the Fund's total assets.
 
                      Other Investments
 
                        The Fund may enter into repurchase agreements and
                      reverse repurchase agreements.
 
                        The Fund may enter into forward commitments or purchase
                      securities on a "when-issued" basis. The Fund expects that
                      commitments by it to enter into forward commitments or
                      purchase when-issued securities will not exceed 25% of the
                      value of the Fund's total assets under normal market
                      conditions. The Fund does not intend to purchase
                      when-issued securities or forward commitments for
                      speculative or leveraging purposes but only for the
                      purpose of acquiring portfolio securities.
 
                        The Fund may invest up to 5% of its total assets in the
                      securities of any one registered investment company, but
                      may not own more than 3% of the securities of any one
                      registered investment company or invest more than 10% of
                      its assets in the securities of other registered
                      investment companies. In accordance with an exemptive
                      order issued to HighMark by the SEC, such other registered
                      investment company securities may include securities of a
                      money market fund of HighMark, and such companies may
                      include registered investment companies for which the
                      Advisor or a Sub-Advisor to a Fund of HighMark, or an
                      affiliate of such Advisor or Sub-Advisor serves as
                      investment advisor, administrator or distributor. Because
                      other registered investment companies employ an investment
                      advisor, such investment by the Fund may cause
                      Shareholders to bear duplicative fees. The Advisor will
                      waive its fees attributable to the assets of the investing
                      Fund invested in a money market fund of HighMark, and, to
                      the extent required by applicable law, the Advisor will
                      waive its fees attributable to the assets of the Fund
                      invested in any investment company. Some Funds are subject
                      to additional restrictions on investment in other
                      investment companies. See "INVESTMENT RESTRICTIONS" in the
                      Statement of Additional Information.
 
                        For further information, see "DESCRIPTION OF PERMITTED
                      INVESTMENTS."
 
                                        7
<PAGE>   164
 
                      Risk Factors
 
                        In addition to credit risk which relates to the ability
                      of an issuer to make payments of principal and interest,
                      all types of bonds are also subject to market risk. Market
                      risk relates to changes in a security's value as a result
                      of interest rate changes generally. An increase in
                      interest rates will generally reduce the value of the
                      investments in the Fund and a decline in interest rates
                      will generally increase the value of those investments.
                      Accordingly, the net asset value of the Fund's shares will
                      vary as a result of changes in the value of the securities
                      in the Fund's portfolio. Therefore, an investment in the
                      Fund may decline in value, resulting in a loss of
                      principal. Because interest rates vary, it is impossible
                      to predict the income or yield of the Fund for any
                      particular period.
 
                        The Fund's shares will fluctuate in value with the value
                      of the underlying securities in its portfolio. Because of
                      their fixed income features, however, convertible
                      securities are expected to fluctuate in value to a lesser
                      degree than the common stock into which they are
                      convertible.
 
                        Changes by recognized rating agencies in the rating of
                      any fixed income security and in the ability of an issuer
                      to make payments of interest and principal also affect the
                      value of these investments. Changes in the value of Fund
                      securities will not affect cash income derived from these
                      securities, but will affect the Fund's net asset value.
 
                        The Fund may invest in securities issued or guaranteed
                      by foreign corporations or foreign governments, their
                      political subdivisions, agencies or instrumentalities and
                      obligations of supranational entities such as the World
                      Bank and the Asian Development Bank. Any investments in
                      these securities will be in accordance with a Fund's
                      investment objective and policies, and are subject to
                      special risks, such as adverse political and economic
                      developments, possible seizure, nationalization or
                      expropriation of foreign investments, less stringent
                      disclosure requirements, changes in foreign currency
                      exchange rates, increased costs associated with the
                      conversion of foreign currency into U.S. dollars, the
                      possible establishment of exchange controls or taxation at
                      the source or the adoption of other foreign governmental
                      restrictions. To the extent that the Fund may invest in
                      securities of foreign issuers that are not traded on any
                      exchange, there is a further risk that these securities
                      may not be readily marketable. The Convertible Securities
                      Fund will not hold foreign currency for investment
                      purposes.
 
                        Securities rated BBB by S&P or Fitch or Baa by Moody's
                      are considered investment grade, but are deemed by these
                      rating services to have some speculative characteristics,
                      and adverse economic conditions or other circumstances are
                      more likely to lead to a weakened capacity to make
                      principal and interest payments than is the case with
                      higher grade bonds.
 
                                        8
<PAGE>   165
 
                      Risks Associated with Convertible Securities
 
                        Investments in lower-rated debt securities (i.e.,
                      securities rated lower than BBB by S&P or Baa by Moody's),
                      in which the Fund may invest, bear certain risks,
                      including the risk that such securities may be thinly
                      traded, which can adversely affect the price at which
                      these securities can be sold and can result in high
                      transaction costs. Market quotations may not be available,
                      and therefore, judgment plays a greater role in valuing
                      lower-rated debt securities than securities for which more
                      extensive quotations and last sale information are
                      available. Adverse publicity and changing investor
                      perceptions may affect the ability of outside pricing
                      services to value lower-rated debt securities, and the
                      Fund's ability to dispose of these securities.
 
                        The market price of lower-rated debt securities may
                      decline significantly in periods of general economic
                      difficulty which may follow periods of rising interest
                      rates. During an economic downturn or a prolonged period
                      of rising interest rates, the ability of issuers of
                      lower-rated debt to meet their payment obligation on these
                      securities may be impaired.
 
                        The Fund may invest in securities which are rated as low
                      as 'Caa' by Moody's or 'CCC' by S&P. Securities rated
                      'Caa' by Moody's are of poor standing and may be in
                      default or may present elements of danger with respect to
                      principal or interest. Debt rated 'CCC' by S&P is regarded
                      as having speculative characteristics with respect to
                      capacity to pay interest and repay principal. In the event
                      of adverse business, financial, and economic conditions,
                      debt rated 'CCC' is not likely to have the capacity to
                      repay principal.
 
INVESTMENT
LIMITATIONS             The Fund may not:
 
                        1) Purchase securities of any issuer (except securities
                      issued or guaranteed by the U.S. Government or its
                      agencies and instrumentalities and repurchase agreements
                      involving such securities) if as a result more than 5% of
                      the total assets of the Fund would be invested in the
                      securities of such issuer. This restriction applies to 75%
                      of the Fund's assets.
 
                        2) Purchase any securities which would cause more than
                      25% of the total assets of the Fund to be invested in the
                      securities of one or more issuers conducting their
                      principal business activities in the same industry,
                      provided that this limitation does not apply to
                      investments in the obligations issued or guaranteed by the
                      U.S. Government or its agencies and instrumentalities and
                      repurchase agreements involving such securities, and
                      provided further, that utilities as a group will not be
                      considered to be one industry, and wholly-owned
                      subsidiaries organized to finance the operations of their
                      parent companies will be considered to be in the same
                      industries as their parent companies.
 
                                        9
<PAGE>   166
 
                        3) Make loans, except that the Fund may (a) purchase or
                      hold debt instruments in accordance with its investment
                      objective and policies, (b) enter into repurchase
                      agreements, and (c) engage in securities lending as
                      described in this Prospectus and in the Statement of
                      Additional Information.
 
                        The foregoing percentages will apply at the time of the
                      purchase of a security. The investment limitations listed
                      above are fundamental policies the substance of which may
                      not be changed without a vote of a majority of the
                      outstanding Shares of the Fund. Additional fundamental and
                      non-fundamental investment limitations are set forth in
                      the Statement of Additional Information.
 
                      Portfolio Turnover
 
                        The Fund's portfolio turnover rate be a factor
                      preventing a sale or purchase when the Advisor or
                      Sub-Advisor believes investment considerations warrant.
                      The Fund's portfolio turnover rate may vary greatly from
                      year to year as well as within a particular year. High
                      portfolio turnover rates generally will result in
                      correspondingly higher brokerage and other transactions
                      costs to the Fund and could involve the realization of
                      capital gains that would be taxable when distributed to
                      Shareholders of the Fund. See "FEDERAL TAXATION."
 
PURCHASE AND
REDEMPTION
OF SHARES               Fiduciary Shares may be purchased at net asset value.
                      Only the following investors qualify to purchase the
                      Convertible Securities Fund's Fiduciary Shares: (i)
                      fiduciary, advisory, agency, custodial and other similar
                      accounts maintained with Union Bank of California, N.A. or
                      its affiliates; (ii) SelectIRA accounts established with
                      The Bank of California, N.A. and invested in any of
                      HighMark's Equity or Fixed Income Funds prior to June 20,
                      1994, which have remained continuously open thereafter and
                      which are not considered to be fiduciary accounts; (iii)
                      Shareholders who currently own Shares of HighMark's Equity
                      or Fixed Income Funds that were purchased prior to June
                      20, 1994 within an account registered in their name with
                      the Funds; and (iv) present and retired directors,
                      officers and employees (and their spouses and children
                      under the age of 21) of Union Bank of California, N.A.,
                      HighMark's current or former distributors or their
                      respective affiliated companies who currently own Shares
                      of HighMark Funds which were purchased before April 30,
                      1997.
 
                        Purchases and redemptions of Shares of the Convertible
                      Securities Fund may be made on days on which the New York
                      Stock Exchange and the Federal Reserve wire system are
                      open for business ("Business Days"). The minimum initial
                      investment is generally $1,000 and the minimum subsequent
                      investment is generally $100. For present and retired
                      directors, officers, and employees (and their spouses and
                      children under the age of 21) of Union Bank of California,
                      SEI Financial Services Company and their affiliates, the
                      minimum initial investment is $250 and the minimum
                      subsequent investment is $50. The Fund's initial and
 
                                       10
<PAGE>   167
 
                      subsequent minimum purchase amounts may be waived in the
                      Distributor's discretion if purchases are made in
                      connection with Individual Retirement Accounts, Keoghs,
                      payroll deduction plans, or 401(k) or similar program
                      accounts. Shareholders may place orders by telephone.
 
                        Purchase orders will be effective if the Distributor
                      receives an order before 1:00 p.m., Pacific time (4:00
                      p.m., Eastern time) and the custodian receives Federal
                      funds before the close of business on the next Business
                      Day. The purchase price of Shares of a Fund is the net
                      asset value next determined after a purchase order is
                      received and accepted by HighMark. The net asset value per
                      Share of a Fund is determined by dividing the total market
                      value of a Fund's investments and other assets, less any
                      liabilities, by the total number of outstanding Shares of
                      a Fund. Net asset value per Share is determined daily as
                      of 1:00 p.m., Pacific time (4:00 p.m., Eastern time) on
                      any Business Day. Purchases will be made in full and
                      fractional Shares of HighMark calculated to three decimal
                      places. HighMark reserves the right to reject a purchase
                      order when the Distributor determines that it is not in
                      the best interest of HighMark and/or its Shareholders to
                      accept such order.
 
                        Shares of the Convertible Securities Fund are offered
                      only to residents of states in which the Shares are
                      eligible for purchase.
 
                        Shareholders who desire to redeem shares of HighMark
                      must place their redemption orders prior to 1:00 p.m.,
                      Pacific time (4:00 p.m., Eastern time), on any Business
                      Day for the order to be accepted on that Business Day. The
                      redemption price is the net asset value of the Fund next
                      determined after receipt by the Distributor of the
                      redemption order. Payment on redemption will be made as
                      promptly as possible and, in any event, within seven
                      calendar days after the redemption order is received. The
                      Fund reserves the right to make payment on redemptions in
                      securities rather than cash.
 
                        Neither HighMark's transfer agent nor HighMark will be
                      responsible for any loss, liability, cost or expense for
                      acting upon wire instructions or upon telephone
                      instructions that it reasonably believes to be genuine.
                      HighMark and its transfer agent will each employ
                      reasonable procedures to confirm that telephone
                      instructions are genuine. Such procedures may include
                      taping of telephone conversations. If market conditions
                      are extraordinarily active or other extraordinary
                      circumstances exist, and you experience difficulties
                      placing redemption orders by telephone, you may wish to
                      consider placing your order by other means.
 
EXCHANGE
PRIVILEGES              As indicated under GENERAL INFORMATION--Description of
                      HighMark & Its Shares, certain of HighMark's Funds issue
                      two classes of Shares (Retail Shares and Fiduciary
                      Shares); as of the date of this Prospectus, the
                      Distribution Plan and distribution fee payable thereunder
                      are applicable only to such Fund's
 
                                       11
<PAGE>   168
 
                      Retail Shares. A Shareholder's eligibility to exchange
                      into a particular class of Shares will be determined at
                      the time of the exchange. The Shareholder must supply, at
                      the time of the exchange, the necessary information to
                      permit confirmation of qualification.
 
                        Each Fund's Shares may be exchanged for Shares of the
                      class of the various other Funds of HighMark which the
                      Shareholder qualifies to purchase directly so long as the
                      Shareholder maintains the applicable minimum account
                      balance in each Fund in which he or she owns Shares and
                      satisfies the minimum initial and subsequent purchase
                      amounts of the Fund into which the Shares are exchanged.
                      Shareholders may exchange their Fiduciary Shares for
                      Fiduciary Shares of another Fund on the basis of the
                      relative net asset value of the Fiduciary Shares
                      exchanged. Shareholders may also exchange Fiduciary Shares
                      of a Fund for Retail Shares of another Fund. Under such
                      circumstances, the cost of the acquired Retail Shares will
                      be the net asset value per Share plus the appropriate
                      sales load.
 
                        Exchanges will be made on the basis of the relative net
                      asset values of the Shares exchanged plus any applicable
                      sales charge. Exchanges are subject to the terms and
                      conditions stated herein and the terms and conditions
                      stated in the respective prospectuses of the Funds.
 
                        Certain entities (including participating organizations
                      and Union Bank of California and its affiliates), however,
                      may charge customers a fee with respect to exchanges made
                      on the customer's behalf. Information about these charges,
                      if any, can be obtained by the entity effecting the
                      exchange and this Prospectus should be read in conjunction
                      with that information.
 
                        A Shareholder wishing to exchange Shares in the
                      Convertible Securities Fund may do so by contacting the
                      transfer agent at 1-800-433-6884. Exchanges will be
                      effected on any Business Day at the net asset value of the
                      Funds involved in the exchange next determined after the
                      exchange request is received by the transfer agent.
 
                        An exchange is considered to be a sale of Shares for
                      federal income tax purposes on which a Shareholder may
                      realize a capital gain or loss. Exchange privileges may be
                      exercised only in those states where Shares of such other
                      Funds of HighMark may legally be sold. HighMark may
                      materially amend or terminate the exchange privileges
                      described herein upon sixty days' notice.
 
DIVIDENDS               The net income of the Convertible Securities Fund is
                      declared and paid monthly as a dividend to Shareholders of
                      record at the close of business on the day of declaration.
                      Net realized capital gains are distributed at least
                      annually to Shareholders of record.
 
                                       12
<PAGE>   169
 
                        Shareholders will automatically receive all income
                      dividends and capital gains distributions in additional
                      full and fractional Shares of the Fund at net asset value
                      as of the date of declaration (which is also the
                      ex-dividend date), unless the Shareholder elects to
                      receive such dividends or distributions in cash.
                      Shareholders wishing to receive their dividends in cash
                      (or wishing to revoke a previously made election) must
                      notify the transfer agent at P.O. Box 8416, Boston, MA
                      02266-8416, and such election (or revocation thereof) will
                      become effective with respect to dividends and
                      distributions having record dates after notice has been
                      received. Dividends paid in additional Shares receive the
                      same tax treatment as dividends paid in cash.
 
FEDERAL
TAXATION                The Convertible Securities Fund intends to qualify for
                      treatment as a "regulated investment company" under the
                      Internal Revenue Code of 1986, as amended (the "Code"),
                      and to distribute substantially all of its net investment
                      income and net realized capital gains so that the Fund is
                      not required to pay federal taxes on these amounts.
 
                        Distributions of ordinary income and/or an excess of net
                      short-term capital gain over net long-term capital loss
                      are treated for federal income tax purposes as ordinary
                      income to Shareholders. The 70 percent dividends received
                      deduction for corporations generally will apply to these
                      distributions to the extent the distribution represents
                      amounts that would qualify for the dividends received
                      deduction when received by the Fund if the Fund were a
                      regular corporation, and to the extent designated by the
                      Fund as so qualifying. Distributions by the Fund of the
                      excess of net long-term capital gain over net short-term
                      capital loss is taxable to Shareholders as long-term
                      capital gain in the year with respect to which it is
                      received, regardless of how long the Shareholder has held
                      Shares of the Fund. Such distributions are not eligible
                      for the dividends received deduction. If a Shareholder
                      disposes of Shares in the Fund at a loss before holding
                      such Shares for longer than six months, such loss will be
                      treated as a long-term capital loss to the extent the
                      Shareholder has received long-term capital gain dividends
                      on the Shares.
 
                        Prior to purchasing Shares of the Convertible Securities
                      Fund, the impact of dividends or capital gain
                      distributions that are expected to be declared or have
                      been declared, but not paid, should be carefully
                      considered. Dividends or capital gain distributions
                      received after a purchase of Shares are subject to federal
                      income taxes, although in some circumstances, the
                      dividends or distributions may be, as an economic matter,
                      a return of capital to the Shareholder. A Shareholder
                      should consult his or her advisor for specific advice
                      about the tax consequences to the Shareholder of investing
                      in the Fund.
 
                                       13
<PAGE>   170
 
                        Fund investments in foreign securities may be subject to
                      withholding taxes at the source on dividend or interest
                      payments. In that case, the Fund's yield on those
                      securities would be decreased. The Fund does not expect to
                      be eligible to elect to permit shareholders to claim a
                      credit or deduction on their income tax return for their
                      pro rata share of such taxes.
 
                        Fund transactions in foreign currencies and hedging
                      activities may give rise to ordinary income or loss to the
                      extent such income or loss results from fluctuations in
                      value of the foreign currency concerned. In addition, such
                      activities will likely produce a difference between book
                      income and taxable income. This difference may cause a
                      portion of the Fund's income distributions to constitute a
                      return of capital for tax purposes or require the Fund to
                      make distributions exceeding book income to qualify as a
                      regulated investment company for tax purposes.
 
                        Investments in an entity that qualifies as a "passive
                      foreign investment company" under the Code could subject
                      the Fund to a U.S. federal income tax or other charge on
                      certain "excess distributions" received with respect to
                      the investment, and on the proceeds from disposition of
                      the investment.
 
                        Additional information regarding federal taxes is
                      contained in the Statement of Additional Information.
                      However, the foregoing and the material in the Statement
                      of Additional Information are only brief summaries of some
                      of the important tax considerations generally affecting
                      the Fund and its Shareholders. In addition, the foregoing
                      discussion and the federal tax information in the
                      Statement of Additional Information are based on tax laws
                      and regulations which are in effect as of the date of this
                      Prospectus; these laws and regulations may subsequently
                      change, and such changes could be retroactive.
 
                        Shareholders will be advised at least annually as to the
                      federal income tax status of distributions made during the
                      year.
 
SERVICE
ARRANGEMENTS          The Advisor
                        Pacific Alliance Capital Management, a division of Union
                      Bank of California, N.A., serves as the Convertible
                      Securities Fund's investment advisor. Subject to the
                      general supervision of HighMark's Board of Trustees, the
                      Advisor manages the Fund in accordance with its investment
                      objective and policies, makes decisions with respect to
                      and places orders for all purchases and sales of the
                      Fund's investment securities, and maintains the Fund's
                      records relating to such purchases and sales.
 
                        For the expenses assumed and services provided by the
                      Advisor as the Fund's investment advisor, Union Bank of
                      California receives a fee from the Convertible Securities
                      Fund, computed daily and paid monthly, at the annual rate
                      of sixty one-hundredths of one percent (.60%) of the
                      Fund's average daily net assets.
 
                                       14
<PAGE>   171
 
                      Depending on the size of the Fund, this fee may be higher
                      than the advisory fee paid by most mutual funds, although
                      the Board of Trustees believes it will be comparable to
                      advisory fees paid by many funds having similar objectives
                      and policies. Union Bank of California may from time to
                      time agree to voluntarily reduce its advisory fee. While
                      there can be no assurance that Union Bank of California
                      will choose to make such an agreement, any voluntary
                      reductions in Union Bank of California's advisory fee will
                      lower the Fund's expenses, and thus increase the Fund's
                      yield and total return, during the period such voluntary
                      reductions are in effect. As of the date of this
                      Prospectus, the Convertible Securities Fund had not yet
                      commenced operations.
 
                        On April 1, 1996, The Bank of California, N.A.,
                      HighMark's then investment advisor, combined with Union
                      Bank and the resulting bank changed its name to Union Bank
                      of California, N.A. At the same time, the banks'
                      investment management divisions were combined. Each of
                      Union Bank and The Bank of California, N.A. (or their
                      predecessor banks) has been in banking since the early
                      1900's and, historically, each has had significant
                      investment functions within its trust and investment
                      division. UnionBanCal Corporation, the parent of Union
                      Bank of California, N.A., is a publicly held corporation,
                      but is principally held by The Bank of Tokyo-Mitsubishi,
                      Ltd. As of September 30, 1996, Union Bank of California
                      and its subsidiaries had approximately $28.7 billion in
                      commercial assets. Pacific Alliance Capital Management is
                      a division of Union Bank of California's Trust and
                      Investment Management Group, which, as of June 30, 1996,
                      had approximately $13.4 billion of assets under
                      management. The Advisor, with a team of approximately 45
                      stock and bond research analysts, portfolio managers and
                      traders, has been providing investment management services
                      to individuals, institutions and large corporations since
                      1917.
 
                      The Sub-Advisor
 
                        The Advisor and Bank of Tokyo-Mitsubishi Trust Company
                      (the "Sub-Advisor") have entered into an investment
                      sub-advisory agreement relating to the Convertible
                      Securities Fund (the "Investment Sub-Advisory Agreement").
                      Under the Investment Sub-Advisory Agreement, the
                      Sub-Advisor makes the day-to-day investment decisions for
                      the assets of the Fund, subject to the supervision of, and
                      policies established by the Advisor and the Trustees of
                      HighMark.
 
                        Bank of Tokyo-Mitsubishi Trust Company, headquartered at
                      1251 Avenue of the Americas, New York, New York 10116, and
                      with offices at 100 Broadway, New York, New York 10005,
                      operates as a wholly-owned subsidiary of The Bank of
                      Tokyo-Mitsubishi, Ltd. The Sub-Advisor was formed by the
                      combination on April 1, 1996, of Bank of Tokyo Trust
                      Company, a wholly-owned subsidiary of The Bank of Tokyo,
                      Ltd., and Mitsubishi Bank Trust Company of New York, a
 
                                       15
<PAGE>   172
 
                      wholly-owned subsidiary of The Mitsubishi Bank, Ltd. Bank
                      of Tokyo Trust Company was the surviving entity, and
                      changed its name to Bank of Tokyo-Mitsubishi Trust
                      Company. Prior to the combination, sub-advisory services
                      were provided by Bank of Tokyo Trust Company. Bank of
                      Tokyo Trust Company was established in 1955, and has
                      provided trust services since that time and management
                      services since 1965.
 
                        The Sub-Advisor serves as portfolio manager to bank
                      common funds, employee benefit funds and personal trust
                      accounts, managing assets in money market, equity and
                      fixed income portfolios. As of June 30, 1996, Bank of
                      Tokyo-Mitsubishi Trust Company managed $700 million in
                      individual portfolios and collective funds. In addition,
                      the Sub-Advisor also serves as the Sub-Advisor to
                      HighMark's Emerging Growth, Government Securities and Blue
                      Chip Growth Funds.
 
                        The Sub-Advisor is entitled to a fee, which is
                      calculated daily and paid monthly out of the Advisor's
                      fee, at an annual rate of .30% of the average daily net
                      assets of the Convertible Securities Fund.
 
                        The day-to-day management of the Convertible Securities
                      Fund's investments is the responsibility of a team of
                      investment professionals. Seth E. Shalov will be the team
                      leader for the Convertible Securities Fund. Mr. Shalov has
                      been a Senior Portfolio Manager with the Sub-Advisor and
                      its predecessor, Bank of Tokyo Trust Company since 1987.
 
                      Administrator
 
                        SEI Fund Resources (the "Administrator") and HighMark
                      are parties to an administration agreement (the
                      "Administration Agreement"). Under the terms of the
                      Administration Agreement, the Administrator provides
                      HighMark with certain management services, including all
                      necessary office space, equipment, personnel and
                      facilities.
 
                        The Administrator is entitled to a fee, which is
                      calculated daily and paid monthly, at an annual rate of
                      .20% of the Fund's average daily net assets. The
                      Administrator may waive its fee or reimburse various
                      expenses to the extent necessary to limit the total
                      operating expenses of the Fund's Fiduciary Shares. Any
                      such waiver is voluntary and may be terminated at any time
                      in the Administrator's sole discretion. Currently, the
                      Administrator has agreed to waive its fee to the rate of
                      .18% of the average daily net assets of the Fund.
 
                        Pursuant to a separate agreement with the Administrator,
                      Union Bank of California, N.A. performs sub-administration
                      services on behalf of the Fund, for which it receives a
                      fee paid by the Administrator at the annual rate of up to
                      0.05% of the Fund's average daily net assets. Union Bank
                      of California has voluntarily
 
                                       16
<PAGE>   173
 
                      agreed to reduce this fee to 0.03%, but reserves the right
                      to terminate its waiver at any time in its sole
                      discretion. A description of the services performed by
                      Union Bank of California pursuant to this Agreement is
                      contained in the Statement of Additional Information.
 
                      The Transfer Agent
 
                        State Street Bank and Trust Company serves as the
                      transfer agent, dividend disbursing agent, and as a
                      shareholder servicing agent for the Fiduciary Shares of
                      HighMark, for which services it receives a fee.
 
                      Shareholder Service Plan
 
                        To support the provision of Shareholder services to both
                      classes of Shares, HighMark has adopted a Shareholder
                      Service Plan. A description of the services performed by
                      service providers pursuant to the Shareholder Service Plan
                      is contained in the Statement of Additional Information.
                      In consideration of services provided by any service
                      provider, which may include Union Bank of California,
                      N.A., Bank of Tokyo-Mitsubishi, Ltd., or their respective
                      affiliates, the Fund may pay a fee at the rate of up to
                      0.25% of its average daily net assets to such service
                      provider. The service provider may waive such fees at any
                      time. Any such waiver is voluntary and may be terminated
                      at any time. Currently, such fees are being waived to the
                      rate of 0.00% of average daily net assets.
 
                      Distributor
 
                        SEI Financial Services Company (the "Distributor") and
                      HighMark are parties to a distribution agreement
                      ("Distribution Agreement"). The Distribution Agreement is
                      renewable annually and may be terminated by the
                      Distributor, by a majority vote of the Disinterested
                      Trustees or by a majority vote of the outstanding
                      securities of HighMark upon not more than 60 days written
                      notice by either party, or upon assignment by the
                      Distributor. Fiduciary Shares are not subject to
                      HighMark's Distribution Plan or a distribution fee.
 
                      Banking Laws
 
                        Union Bank of California believes that it may perform
                      the services for the Fund contemplated by its investment
                      advisory agreement with HighMark without a violation of
                      applicable banking laws and regulations. Union Bank of
                      California also believes that it may perform
                      sub-administration and sub-accounting services on behalf
                      of the Fund without a violation of applicable banking laws
                      and regulations. Future changes in federal or state
                      statutes and regulations relating to permissible
                      activities of banks or bank holding companies and their
                      subsidiaries and affiliates, as well as further judicial
                      or administrative decisions or interpretations of present
                      and future statutes and regulations, could change the
                      manner in which Union Bank of California or the Advisor
                      could continue to perform such
 
                                       17
<PAGE>   174
 
                      services for the Fund. For a further discussion of
                      applicable banking laws and regulations, see the Statement
                      of Additional Information.
 
                      Custodian
 
                        Union Bank of California also serves as the custodian
                      and as a shareholder servicing agent for the Convertible
                      Securities Fund. The custodian holds cash securities and
                      other assets of HighMark as required by the 1940 Act.
 
                        Services performed by Union Bank of California, as the
                      Fund's shareholder servicing agent and custodian, as well
                      as the basis of remuneration for such services, are
                      described in the Statement of Additional Information.
 
GENERAL
INFORMATION           Description of HighMark & Its Shares
 
                        HighMark was organized as a Massachusetts business trust
                      on March 10, 1987, and consists of sixteen series of
                      Shares open for investment representing units of
                      beneficial interest in HighMark's Growth Fund, Income
                      Equity Fund, Balanced Fund, Value Momentum Fund, Blue Chip
                      Growth Fund, Emerging Growth Fund, International Equity
                      Fund, Bond Fund, Intermediate-Term Bond Fund, Government
                      Securities Fund, Convertible Securities Fund, California
                      Intermediate Tax-Free Bond Fund, Diversified Money Market
                      Fund, U.S. Government Obligations Money Market Fund, 100%
                      U.S. Treasury Obligations Money Market Fund, and
                      California Tax-Free Money Market Fund. As of the date
                      hereof, no Shares of the Value Momentum Fund, the Blue
                      Chip Growth Fund, the Emerging Growth Fund, the
                      International Equity Fund, the Intermediate-Term Bond
                      Fund, the Convertible Securities Fund, the Government
                      Securities Fund, and the California Intermediate Tax-Free
                      Bond Fund, had been offered for sale in HighMark. Shares
                      of each Fund are freely transferable, are entitled to
                      distributions from the assets of the Fund as declared by
                      the Board of Trustees, and, if HighMark were liquidated,
                      would receive a pro rata share of the net assets
                      attributable to that Fund. Shares are without par value.
 
                        As noted above, pursuant to a Multiple Class Plan on
                      file with the Securities and Exchange Commission
                      permitting the issuance and sale of two classes of Shares
                      in selected Funds, Shares of such Funds have been divided
                      into two classes, designated Retail Shares and Fiduciary
                      Shares. For information regarding the Retail Shares,
                      interested persons may contact the Distributor for a
                      prospectus at 1-800-433-6884.
 
                      Performance Information
 
                        From time to time, HighMark may advertise the aggregate
                      total return, average annual total return, yield and
                      distribution rate with respect to the Fiduciary Shares of
                      the Convertible Securities Fund.
 
                                       18
<PAGE>   175
 
                        The aggregate total return and average annual total
                      return of the Convertible Securities Fund may be quoted
                      for the life of the Fund and for ten-year, five-year and
                      one-year periods, in each case through the most recent
                      calendar quarter. Aggregate total return is determined by
                      calculating the change in the value of a hypothetical
                      $1,000 investment in the Fund over the applicable period
                      that would equate the initial amount invested to the
                      ending redeemable value of the investment. The ending
                      redeemable value includes dividends and capital gain
                      distributions reinvested at net asset value. Average
                      annual total return is calculated by annualizing the
                      Fund's aggregate total return over the relevant number of
                      years. The resulting percentage indicates the average
                      positive or negative investment results that an investor
                      in the Fund would have experienced on an annual basis from
                      changes in Share price and reinvestment of dividends and
                      capital gain distributions.
 
                        The yield of the Fund is determined by annualizing the
                      net investment income per Share of the Fund during a
                      specified thirty-day period and dividing that amount by
                      the per Share public offering price of the Fund on the
                      last day of the period.
 
                        The distribution rate of the Fund is determined by
                      dividing the income and capital gains distributions, or
                      where indicated the income distributions alone, on a Share
                      of the Fund over a twelve-month period by the per Share
                      public offering price of the Fund on the last day of the
                      period.
 
                        The Fund may periodically compare its performance to the
                      performance of other mutual funds tracked by mutual fund
                      rating services (such as Lipper Analytical), financial and
                      business publications and periodicals; broad groups of
                      comparable mutual funds; unmanaged indices which may
                      assume investment of dividends but generally do not
                      reflect deductions for administrative and management
                      costs; or other investment alternatives. The Fund may
                      advertise performance that includes results from periods
                      in which the Fund's assets were managed in a
                      non-registered predecessor vehicle.
 
                        All performance information presented for the Fund is
                      based on past performance and does not predict future
                      performance.
 
                      Miscellaneous
 
                        Shareholders will be sent unaudited semi-annual reports
                      and annual reports audited by independent public
                      accountants.
 
                        Shareholders are entitled to one vote for each Share
                      held in the Fund as determined on the record date for any
                      action requiring a vote by the Shareholders, and a
                      proportionate fractional vote for each fractional Share
                      held. Shareholders of HighMark will vote in the aggregate
                      and not by series or class except (i) as
 
                                       19
<PAGE>   176
 
                      otherwise expressly required by law or when HighMark's
                      Board of Trustees determines that the matter to be voted
                      upon affects only the interests of the Shareholders of a
                      particular series or particular class, and (ii) only
                      Retail Shares will be entitled to vote on matters
                      submitted to a Shareholder vote relating to the
                      Distribution Plan. HighMark is not required to hold
                      regular annual meetings of Shareholders, but may hold
                      special meetings from time to time.
 
                        HighMark's Trustees are elected by Shareholders, except
                      that vacancies may be filled by vote of the Board of
                      Trustees. Trustees may be removed by the Board of
                      Trustees, or by Shareholders at a meeting called for such
                      purpose. For information about how Shareholders may call
                      such a meeting and communicate with other Shareholders for
                      that purpose, see ADDITIONAL INFORMATION-- Miscellaneous
                      in the Statement of Additional Information.
 
                        Inquiries may be directed in writing to SEI Financial
                      Services Company, Oaks, Pennsylvania 19456, or by calling
                      toll free 1-800-433-6884.
 
DESCRIPTION OF
PERMITTED
INVESTMENTS             The following is a description of permitted investments
                      for the HighMark Convertible Securities Fund.
 
                        AMERICAN DEPOSITARY RECEIPTS (ADRs)--ADRs are receipts
                      typically issued by a U.S. financial institution that
                      evidence ownership of underlying securities issued by a
                      foreign issuer.
 
                        ASSET-BACKED SECURITIES (NON-MORTGAGE)--Debt Instruments
                      secured by company receivables, truck and auto loans,
                      leases, and credit card receivables. Such securities are
                      generally issued as pass-through certificates, which
                      represent undivided fractional ownership interests in the
                      underlying pools of assets. Such securities also may be
                      debt instruments, which are also known as collateralized
                      obligations and are generally issued as the debt of a
                      special purpose entity, such as a trust, organized solely
                      for the purpose of owning such assets and issuing such
                      debt. The purchase of non-mortgage asset-backed securities
                      raises risk considerations peculiar to the financing of
                      the instruments underlying such securities. Asset-backed
                      securities entail prepayment risk, which may vary
                      depending on the type of asset, but is generally less than
                      the prepayment risk associated with mortgage-backed
                      securities.
 
                        Like mortgages underlying mortgage-backed securities,
                      underlying automobile sales contracts or credit card
                      receivables are subject to substantial prepayment risk,
                      which may reduce the overall return to certificate
                      holders. Nevertheless, principal prepayment rates tend not
                      to vary as much in response to changes in interest rates
                      and the short-term nature of the underlying car loans or
                      other receivables tend to dampen the impact of any change
                      in the prepayment level. Certificate holders may also
                      experience delays in payment on the certificates if
 
                                       20
<PAGE>   177
 
                      the full amounts due on underlying sales contracts or
                      receivables are not realized by the trust because of
                      unanticipated legal or administrative costs of enforcing
                      the contracts or because of depreciation or damage to the
                      collateral (usually automobiles) securing certain
                      contracts, or other factors. If consistent with their
                      investment objectives and policies, the Fund may invest in
                      other asset-backed securities that may be developed in the
                      future.
 
                        BANKERS' ACCEPTANCES--Bills of exchange or time drafts
                      drawn on and accepted by commercial banks. They are used
                      by corporations to finance the shipment and storage of
                      goods and to furnish dollar exchange. Maturities are
                      generally six months or less.
 
                        CERTIFICATES OF DEPOSIT--Negotiable interest-bearing
                      instruments with a specific maturity. Certificates of
                      deposit are issued by banks and savings and loan
                      institutions in exchange for the deposit of funds and
                      normally can be traded in the secondary market prior to
                      maturity.
 
                        COMMERCIAL PAPER--Unsecured short-term promissory notes
                      issued by corporations and other entities. Maturities on
                      these issues vary from a few days to nine months. Purchase
                      of such instruments involves a risk of default by the
                      issuer.
 
                        CONVERTIBLE BONDS AND CONVERTIBLE PREFERRED STOCK--
                      Convertible Bonds are bonds convertible into a set number
                      of shares of another form of security (usually common
                      stock) at a prestated price. Convertible bonds have
                      characteristics similar to both fixed-income and equity
                      securities. Convertible preferred stock is a class of
                      capital stock that pays dividends at a specified rate and
                      that has preference over common stock in the payment of
                      dividends and the liquidation of assets. Convertible
                      preferred stock is preferred stock exchangeable for a
                      given number of common stock shares, and has
                      characteristics similar to both fixed-income and equity
                      securities. Because of the conversion feature, the market
                      value of convertible bonds and convertible preferred stock
                      tend to move together with the market value of the
                      underlying stock. As a result, a Fund's selection of
                      convertible bonds and convertible preferred stock is
                      based, to a great extent, on the potential for capital
                      appreciation that may exist in the underlying stock. The
                      value of convertible bonds and convertible preferred stock
                      is also affected by prevailing interest rates, the credit
                      quality of the issuer and any call provisions.
 
                        DERIVATIVES--Instruments whose value is derived from an
                      underlying contract, index or security, or any combination
                      thereof, including futures, options (e.g., puts and
                      calls), options on futures, swap agreements, and some
                      mortgage-backed securities (CMOs, REMICs, IOs and POs).
                      See elsewhere in this "DESCRIPTION OF PERMITTED
                      INVESTMENTS" for discussions of these various instruments,
                      and see "INVESTMENT OBJECTIVES" and "INVEST-
 
                                       21
<PAGE>   178
 
                      MENT POLICIES" for more information about any policies and
                      limitations applicable to their use.
 
                        FUTURES AND OPTIONS ON FUTURES--Some futures strategies,
                      including selling futures, buying puts and writing calls,
                      reduce a Fund's exposure to price fluctuations. Other
                      strategies, including buying futures, writing puts and
                      buying calls, tend to increase market exposure. Futures
                      and options may be combined with each other in order to
                      adjust the risk and return characteristics of the overall
                      portfolio.
 
                        Options and futures can be volatile instruments, and
                      involve certain risks that, if applied at an inappropriate
                      time, could negatively impact a Fund's return.
 
                        INVESTMENT GRADE BONDS--Interest-bearing or discounted
                      government or corporate securities that obligate the
                      issuer to pay the bondholder a specified sum of money,
                      usually at specific intervals, and to repay the principal
                      amount of the loan at maturity. Investment grade bonds are
                      those rated BBB or better by S&P or Baa or better by
                      Moody's or similarly rated by other NRSROs, or, if not
                      rated, determined to be of comparable quality by the
                      Advisor.
 
                        LOWER-RATED, HIGHER-YIELDING, HIGH-RISK DEBT
                      SECURITIES--High-yield, high-risk securities consist of
                      securities rated Ba or lower by Moody's or BB or lower by
                      S&P. Lower-rated debt securities are considered
                      speculative and involve greater risk of loss than
                      investment grade debt securities, and are more sensitive
                      to changes in the issuer's capacity to pay. For a
                      description of the debt securities ratings, see the
                      "Appendix."
 
                        MONEY MARKET INSTRUMENTS--Short-term, debt instruments
                      or deposits and may include, for example, (i) commercial
                      paper rated within the highest rating category by a NRSRO
                      at the time of investment, or, if not rated, determined by
                      the Advisor to be of comparable quality; (ii) obligations
                      (certificates of deposit, time deposits, bank master
                      notes, and bankers' acceptances) of thrift institutions,
                      savings and loans, U.S. commercial banks (including
                      foreign branches of such banks), and U.S. and foreign
                      branches of foreign banks, provided that such institutions
                      (or, in the case of a branch, the parent institution) have
                      total assets of $1 billion or more as shown on their last
                      published financial statements at the time of investment;
                      (iii) short-term corporate obligations rated within the
                      three highest rating categories by a NRSRO (e.g., at least
                      A by S&P or A by Moody's) at the time of investment, or,
                      if not rated, determined by the Advisor to be of
                      comparable quality; (iv) general obligations issued by the
                      U.S. Government and backed by its full faith and credit,
                      and obligations issued or guaranteed as to principal and
                      interest by agencies or instrumentalities of the U.S.
                      Government (e.g., obligations issued by Farmers Home
                      Administration, Government National Mortgage Association,
                      Federal Farm Credit Bank and
 
                                       22
<PAGE>   179
 
                      Federal Housing Administration); (v) receipts, including
                      TRs, TIGRs and CATS; (vi) repurchase agreements involving
                      such obligations; (vii) loan participations issued by a
                      bank in the United States with assets exceeding $1 billion
                      and for which the underlying loan is issued by borrowers
                      in whose obligations the Fund may invest; (viii) money
                      market funds and (ix) foreign commercial paper.
 
                        Certain of the obligations in which a Fund may invest
                      may be variable or floating rate instruments, may involve
                      conditional or unconditional demand features and may
                      include variable amount master demand notes.
 
                        MORTGAGE-BACKED SECURITIES--Securities generally issued
                      or guaranteed by U.S. government agencies such as GNMA,
                      FNMA, or FHLMC. GNMA mortgage-backed certificates are
                      mortgage-backed securities of the modified pass-through
                      type, which means that both interest and principal
                      payments (including prepayments) are passed through
                      monthly to the holder of the certificate. Each GNMA
                      certificate evidences an interest in a specific pool of
                      mortgage loans insured by the Federal Housing
                      Administration or the Farmers Home Administration or
                      guaranteed by the Veterans Administration. FNMA, a
                      federally-chartered and stockholder-owned corporation,
                      issues pass-through certificates which are guaranteed as
                      to payment of principal and interest by FNMA. FHLMC, a
                      corporate instrumentality of the United States, issues
                      participation certificates which represent an interest in
                      mortgages held in FHLMC's portfolio. FHLMC guarantees the
                      timely payment of interest and the ultimate collection of
                      principal. Securities issued or guaranteed by FNMA and
                      FHLMC are not backed by the full faith and credit of the
                      United States. There can be no assurance that the U.S.
                      government would provide financial support to FNMA or
                      FHLMC if necessary in the future.
 
                        Although payments on certain mortgage-related securities
                      may be guaranteed by a third party or otherwise similarly
                      secured, the market value of such securities is not
                      secured and may fluctuate significantly because of changes
                      in interest rates and changes in prepayment levels. Thus,
                      for example, if a Fund purchases a mortgage-related
                      security at a premium, that portion may be lost if there
                      is a decline in the market value of the security whether
                      due to changes in interest rates or prepayments of the
                      underlying mortgage collateral. As with other
                      interest-bearing securities, the prices of
                      mortgage-related securities are inversely affected by
                      changes in interest rates. However, although the value of
                      a mortgage-related security may decline when interest
                      rates rise, the converse is not necessarily true because
                      in periods of declining interest rates the mortgages
                      underlying the securities are prone to prepayment which
                      results in amounts being available for reinvestment which
                      are likely to be invested at a lower interest rate. For
                      this and other reasons, the stated maturity of a
                      mortgage-related security may be shortened by unscheduled
                      prepayments on the underlying mortgages and,
 
                                       23
<PAGE>   180
 
                      accordingly, it is not possible to predict accurately the
                      security's return to a Fund. In addition, regular payments
                      received on mortgage-related securities include both
                      interest and principal. No assurance can be given as to
                      the return a Fund will receive when these amounts are
                      reinvested. As a consequence, mortgage-related securities
                      may be a less effective means of "locking in" interest
                      rates than other types of debt securities having the same
                      stated maturity, may have less potential for capital
                      appreciation and may be considered riskier investments as
                      a result.
 
                        Adjustable rate mortgage securities ("ARMS") are
                      pass-through certificates representing ownership interests
                      in a pool of adjustable rate mortgages and the resulting
                      cash flow from those mortgages. Unlike conventional debt
                      securities, which provide for periodic (usually
                      semi-annual) payments of interest and payments of
                      principal at maturity or on specified call dates, ARMs
                      provide for monthly payments based on a pro rata share of
                      both periodic interest and principal payments and
                      prepayments of principal on the underlying mortgage pool
                      (less GNMA's, FNMA's, or FHLMC's fees and any applicable
                      loan servicing fees).
 
                        Collateralized mortgage obligations ("CMOs") are bonds
                      generally issued by single purpose, stand-alone finance
                      subsidiaries or trusts established by financial
                      institutions, government agencies, investment banks, or
                      other similar institutions, and collateralized by pools of
                      mortgage loans. Payments of principal and interest on the
                      collateral mortgages are used to pay debt service on the
                      CMO. In a CMO, a series of bonds or certificates is issued
                      in multiple classes. Each class of CMOs, often referred to
                      as a "tranche," is issued at a specific coupon rate and
                      has a stated maturity or final distribution date. The
                      principal and interest payment on the underlying mortgages
                      may be allocated among the classes of CMOs in several
                      ways. Typically, payments of principal, including any
                      prepayments, on the underlying mortgages would be applied
                      to the classes in the order of their respective stated
                      maturities or final distribution dates, so that no payment
                      of principal will be made on CMOs of a class until all
                      CMOs of other classes having earlier stated maturities or
                      final distribution dates have been paid in full.
 
                        One or more classes of CMOs may have coupon rates that
                      reset periodically based on an index, such as the London
                      Interbank Offered Rate ("LIBOR"). Each Fund may purchase
                      fixed, adjustable, or "floating" rate CMOs that are
                      collateralized by fixed rate or adjustable rate mortgages
                      that are guaranteed as to payment of principal and
                      interest by an agency or instrumentality of the U.S.
                      government or are directly guaranteed as to payment of
                      principal and interest by the issuer, which guarantee is
                      collateralized by U.S. government securities or is
                      collateralized by privately issued fixed rate or
                      adjustable rate mortgages.
 
                                       24
<PAGE>   181
 
                        Securities such as zero-coupon obligations,
                      mortgage-backed and asset-backed securities, and
                      collateralized mortgage obligations ("CMOs") will have
                      greater price volatility then other fixed-income
                      obligations. Because declining interest rates may lead to
                      prepayment of underlying mortgages, automobile sales
                      contracts or credit card receivables, the prices of
                      mortgage-related and asset-backed securities may not rise
                      with a decline in interest rates. Mortgage-backed and
                      asset-backed securities and CMOs are extremely sensitive
                      to the rate of principal prepayment. Similarly, callable
                      corporate bonds also present risk of prepayment. During
                      periods of falling interest rates, securities that can be
                      called or prepaid may decline in value relative to similar
                      securities that are not subject to call or prepayment.
 
                        Real Estate Mortgage Investment Conduits ("REMICs") are
                      private entities formed for the purpose of holding a fixed
                      pool of mortgages secured by an interest in real property.
                      REMICs are similar to CMOs in that they issue multiple
                      classes of securities.
 
                        OPTIONS--Under a call option, the purchaser of the
                      option has the right to purchase, and the writer (the
                      Fund) the obligation to sell, the underlying security at
                      the exercise price during the option period. A put option
                      gives the purchaser the right to sell, and the writer the
                      obligation to purchase, the underlying security at the
                      exercise price during the option period.
 
                        In addition, certain Funds may buy options on stock
                      indices to invest cash on an interim basis. Such options
                      will be listed on a national securities exchange. In order
                      to close out an option position, a Fund may enter into a
                      "closing purchase transaction"--the purchase of an option
                      on the same security with the same exercise price and
                      expiration date as the option contract previously written
                      on any particular security. When the security is sold, a
                      Fund effects a closing purchase transaction so as to close
                      out any existing option on that security.
 
                        There are risks associated with such investments
                      including the following: (1) the success of a hedging
                      strategy may depend on the ability of the Advisor or
                      Sub-Advisor to predict movements in the prices of
                      individual securities, fluctuations in markets and
                      movements in interest rates; (2) there may be an imperfect
                      correlation between the movement in prices of securities
                      held by a Fund and the price of options; (3) there may not
                      be a liquid secondary market for options; and (4) while a
                      Fund will receive a premium when it writes covered call
                      options, it may not participate fully in a rise in the
                      market value of the underlying security.
 
                        RECEIPTS--Interests in separately traded interest and
                      principal component parts of U.S. Treasury obligations
                      that are issued by banks and brokerage firms and are
                      created by depositing Treasury notes and Treasury bonds
                      into a special account at a custodian bank. The custodian
                      holds the interest and principal
 
                                       25
<PAGE>   182
 
                      payments for the benefit of the registered owners of the
                      certificates of such receipts. The custodian arranges for
                      the issuance of the certificates or receipts evidencing
                      ownership and maintains the register. Receipts include
                      "Treasury Receipts" ("TR's"), "Treasury Investment Growth
                      Receipts" ("TIGR's"), and "Certificates of Accrual on
                      Treasury Securities" ("CATS"). TR's, TIGR's and CATS are
                      sold as zero coupon securities, which means that they are
                      sold at a substantial discount and redeemed at face value
                      at their maturity date without interim cash payments of
                      interest or principal. This discount is accreted over the
                      life of the security, and such accretion will constitute
                      the income earned on the security for both accounting and
                      tax purposes. Because of these features, such securities
                      may be subject to greater interest rate volatility than
                      interest-paying securities. See also "FEDERAL TAXATION."
 
                        REPURCHASE AGREEMENTS--Agreements whereby a Fund will
                      acquire securities from approved financial institutions or
                      registered broker-dealers that agree to repurchase the
                      securities at a mutually agreed-upon date and price. The
                      repurchase agreements entered into by the Funds will
                      provide that the underlying security at all times shall
                      have a value equal to 102% of the resale price stated in
                      the agreement. Repurchase agreements involving government
                      securities are not subject to a Fund's fundamental
                      investment limitation on purchasing securities of any one
                      issuer. If the seller defaults on its repurchase
                      obligation or becomes insolvent, the Fund holding such
                      obligations would suffer a loss to the extent that either
                      the proceeds from a sale of the underlying portfolio
                      securities were less than the repurchase price or the
                      Fund's disposition of the securities was delayed pending
                      court action. Securities subject to repurchase agreements
                      will be held by a qualified custodian or in the Federal
                      Reserve/Treasury book-entry system. Repurchase agreements
                      are considered to be loans by a Fund under the Investment
                      Company Act of 1940 (the "1940 Act").
 
                        REVERSE REPURCHASE AGREEMENTS--A Fund may borrow funds
                      for temporary purposes by entering into reverse repurchase
                      agreements, provided such action is consistent with the
                      Fund's investment objective and fundamental investment
                      restrictions; as a matter of non-fundamental policy, each
                      Fund intends to limit such investments to no more than 10%
                      of the value of its total assets. Pursuant to a reverse
                      repurchase agreement, a Fund will sell portfolio
                      securities to financial institutions such as banks or to
                      broker-dealers, and agree to repurchase the securities at
                      a mutually agreed-upon date and price. A Fund intends to
                      enter into reverse repurchase agreements only to avoid
                      otherwise selling securities during unfavorable market
                      conditions to meet redemptions. At the time a Fund enters
                      into a reverse repurchase agreement, it will place in a
                      segregated custodial account assets such as U.S.
                      Government securities or other liquid, high-quality debt
                      securities consistent with the Fund's investment objective
                      having a value equal to 102% of the repurchase price
                      (including accrued interest), and will
 
                                       26
<PAGE>   183
 
                      subsequently monitor the account to ensure that an
                      equivalent value is maintained. Reverse repurchase
                      agreements involve the risk that the market value of the
                      securities sold by a Fund may decline below the price at
                      which a Fund is obligated to repurchase the securities.
                      Reverse repurchase agreements are considered to be
                      borrowings by a Fund under the 1940 Act.
 
                        RULE 144A SECURITIES--Rule 144A Securities are
                      securities that have not been registered under the
                      Securities Act of 1933, but which may be traded between
                      certain qualified institutional investors, including
                      investment companies. The absence of a secondary market
                      may affect the value of the Rule 144A Securities. The
                      Board of Trustees of the Group has established guidelines
                      and procedures to be utilized to determine the liquidity
                      of such securities.
 
                        SECURITIES ISSUED ON A FORWARD COMMITMENT BASIS OR
                      WHEN-ISSUED SECURITIES--Securities purchased for delivery
                      beyond the normal settlement date at a stated price and
                      yield and which thereby involve a risk that the yield
                      obtained in the transaction will be less than that
                      available in the market when delivery takes place. When a
                      Fund agrees to purchase when-issued securities or enter
                      into forward commitments, the Group's custodian will be
                      instructed to set aside cash or liquid portfolio
                      securities equal to the amount of the commitment in a
                      segregated account. A Fund will generally not pay for such
                      securities and no income will accrue on the securities
                      until they are received. These securities are recorded as
                      an asset and are subject to changes in value based upon
                      changes in the general level of interest rates. Therefore,
                      the purchase of securities on a "when-issued" basis or
                      forward commitments may increase the risk of fluctuations
                      in a Fund's net asset value.
 
                        SECURITIES LENDING--During the time portfolio securities
                      are on loan from a Fund, the borrower will pay the Fund
                      any dividends or interest paid on the securities. In
                      addition, loans will be subject to termination by the Fund
                      or the borrower at any time and, while a Fund will
                      generally not have the right to vote securities on loan,
                      it will terminate the loan and regain the right to vote if
                      that is considered important with respect to the
                      investment. While the lending of securities may subject a
                      Fund to certain risks, such as delays or an inability to
                      regain the securities in the event the borrower were to
                      default on its lending agreement or enter into bankruptcy,
                      a Fund will receive 100% collateral in the form of cash or
                      U.S. Government securities. This collateral will be valued
                      daily by the lending agent, with oversight by the Advisor,
                      and, should the market value of the loaned securities
                      increase, the borrower will be required to furnish
                      additional collateral to the Fund.
 
                        SECURITIES SUBJECT TO A PUT FEATURE--A "put" feature
                      permits a Fund to sell a fixed income security at a fixed
                      price prior to maturity. The underlying fixed income
                      securities subject to a put may be sold at any time at the
 
                                       27
<PAGE>   184
 
                      market rates. However, unless the put was an integral part
                      of the fixed income security as originally issued, it may
                      not be marketable or assignable. Generally, a premium is
                      paid for a put feature or a put feature is purchased
                      separately which results in a lower yield than would
                      otherwise be available for the same fixed income
                      securities.
 
                        STANDARD & POOR'S DEPOSITARY RECEIPTS (SPDRs)--SPDRs are
                      interests in a unit investment trust holding a portfolio
                      of securities linked to the S&P 500 Index. SPDRs closely
                      track the underlying portfolio of securities, trade like a
                      share of common stock and pay periodic dividends
                      proportionate to those paid by the portfolio of stocks
                      that constitutes the S&P 500 Index. For further
                      information regarding SPDRs, see the Statement of
                      Additional Information.
 
                        TAX-EXEMPT COMMERCIAL PAPER--Commercial paper, which is
                      commercial paper issued by governments and political
                      subdivisions.
 
                        TIME DEPOSITS--Non-negotiable receipts issued by U.S. or
                      foreign banks in exchange for the deposit of funds. Like
                      certificates of deposit, they earn a specified rate of
                      interest over a definite period of time; however, they
                      cannot be traded in the secondary market. Time deposits
                      with a withdrawal penalty are considered to be illiquid
                      securities.
 
                        U.S. GOVERNMENT AGENCY SECURITIES--Certain Federal
                      agencies have been established as instrumentalities of the
                      U.S. Government to supervise and finance certain types of
                      activities. Issues of these agencies, while not direct
                      obligations of the U.S. Government, are either backed by
                      the full faith and credit of the United States (e.g., GNMA
                      securities) or supported by the issuing agencies' right to
                      borrow from the U.S. Treasury. The issues of other
                      agencies are supported only by the credit of the
                      instrumentality (e.g., FNMA securities).
 
                        U.S. TREASURY OBLIGATIONS--Bills, notes, and bonds
                      issued by the U.S. Treasury, as well as separately traded
                      interest and principal component parts of such obligations
                      known as Separately Traded Registered Interest and
                      Principal Securities ("STRIPS") that are transferable
                      through the Federal book-entry system.
 
                        U.S. Government Securities generally do not involve the
                      credit risks associated with investments in other types of
                      fixed-income securities, although, as a result, the yields
                      available from U.S. Government Securities are generally
                      lower than the yields available from otherwise comparable
                      corporate fixed-income securities. Like other fixed-income
                      securities, however, the values of U.S. Government
                      Securities change as interest rates fluctuate.
                      Fluctuations in the value of portfolio securities will in
                      many cases not affect interest income on existing
                      portfolio securities, but will be reflected in the Fund's
                      net asset value. Because the magnitude of these
                      fluctuations will generally be greater at times when a
                      Fund's
 
                                       28
<PAGE>   185
 
                      average maturity is longer, under certain market
                      conditions the Fund may invest in short-term investments
                      yielding lower current income rather than investing in
                      higher yielding longer-term securities.
 
                        VARIABLE AND FLOATING RATE INSTRUMENTS--Obligations that
                      may carry variable or floating rates of interest, may
                      involve conditional or unconditional demand features and
                      may include variable amount master demand notes. The
                      interest rates on these securities may be reset daily,
                      weekly, quarterly or some other reset period, and may have
                      a floor or ceiling on interest rate changes. There is a
                      risk that the current interest rate on such obligations
                      may not accurately reflect existing market interest rates.
                      A demand instrument with a demand notice period exceeding
                      seven days may be considered illiquid if there is no
                      secondary market for such security.
 
                        WARRANTS--Securities that entitle the holder to buy a
                      proportionate amount of common stock at a specified price
                      for a limited or unlimited period of time. Warrants are
                      often freely transferable and are traded on major stock
                      exchanges.
 
                        YANKEE BONDS--Dollar denominated securities issued by
                      foreign-domiciled issuers that obligate the issuer to pay
                      the bondholder a specified sum of money, usually
                      semiannually, and to repay the principal amount of the
                      loan at maturity. Sovereign bonds are bonds issued by the
                      governments of foreign countries. Supranational bonds are
                      those issued by supranational entities, such as the World
                      Bank and European Investment Bank. Canadian bonds are
                      bonds issued by Canadian provinces.
 
                        ZERO-COUPON OBLIGATIONS--Non-income producing securities
                      evidencing ownership of future interest and principal
                      payments on bonds. These obligations pay no current
                      interest and are typically sold at prices greatly
                      discounted from par value. The return on a zero-coupon
                      obligation, when held to maturity, equals the difference
                      between the par value and the original purchase price.
 
                        For federal income tax purposes, the difference between
                      the par value and the original issue price (original issue
                      discount) is included in the income of a holder of a
                      zero-coupon obligation over the term of the obligation
                      even though the interest is not paid until maturity. The
                      amount included in income is determined under a constant
                      interest rate method. In addition, if an obligation is
                      purchased subsequent to its original issue, a holder such
                      as the Income Funds may elect to include market discount
                      in income currently on a ratable accrual method or a
                      constant interest rate method. Market discount is the
                      difference between the obligation's "adjusted issue price"
                      (the original issue price plus original issue discount
                      accrued to date) and the holder's purchase price. If no
                      such election is made, gain on the disposition of a market
                      discount obligation is treated as
 
                                       29
<PAGE>   186
 
                      ordinary income (rather than capital gain) to the extent
                      it does not exceed the accrued market discount.
 
                        Zero-coupon obligations have greater price volatility
                      than other fixed-income obligations of similar maturity
                      and such obligations will be purchased when the yield
                      spread, in light of the obligation's duration, is
                      considered advantageous.
 
                                       30
<PAGE>   187
 
                        HighMark CONVERTIBLE SECURITIES
                                      FUND
                            INVESTMENT PORTFOLIO OF
                                 HighMark FUNDS
                   For further information (including current
                  yield, purchase and redemption information),
                              call (800) 433-6884
 
INVESTMENT ADVISOR
Pacific Alliance Capital Management,
a division of Union Bank of California, N.A.
475 Sansome Street
Post Office Box 45000
San Francisco, CA 94104
 
SUB-ADVISOR
Bank of Tokyo-Mitsubishi Trust Company
1251 Avenue of the Americas
New York, New York 10116
 
CUSTODIAN
Union Bank of California, N.A.
475 Sansome Street
Post Office Box 45000
San Francisco, CA 94104
 
ADMINISTRATOR & DISTRIBUTOR
SEI Fund Resources and
SEI Financial Services Company
Oaks, Pennsylvania 19456
 
LEGAL COUNSEL
Ropes & Gray
One Franklin Square
1301 K Street, N.W., Suite 800 East
Washington, D.C. 20005
 
AUDITORS
Deloitte & Touche LLP
1700 Courthouse Plaza Northeast
Dayton, OH 45402
 
  NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS IN CONNECTION WITH THE OFFERING
MADE BY THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY HIGHMARK OR
ITS DISTRIBUTOR. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY HIGHMARK OR
BY THE DISTRIBUTOR IN ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY
BE MADE.
 
NOT FDIC INSURED
<PAGE>   188
 
                                [HIGHMARK LOGO]
 
                                 HIGHMARK FUNDS
 
                               TRS-17236(R12/95)
<PAGE>   189
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR
     MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT
     BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR
     THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE
     UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS
     OF ANY SUCH STATE.
 
                             SUBJECT TO COMPLETION
 
                                 HIGHMARK FUNDS
 
                                 BALANCED FUND
 
  HighMark Funds ("HighMark") is an open-end, diversified, registered investment
company that offers a convenient means of investing in one or more
professionally managed portfolios of securities. This Prospectus relates to
HighMark's Balanced Fund.
 
                                FIDUCIARY SHARES
 
  HighMark's Fiduciary Shares are offered to the following investors: (i)
fiduciary, advisory, agency, custodial and other similar accounts maintained
with Union Bank of California, N.A. or its affiliates; (ii) SelectIRA accounts
established with The Bank of California, N.A. and invested in any of HighMark's
Equity or Income Funds prior to June 20, 1994, which have remained continuously
open thereafter and which are not considered to be fiduciary accounts; (iii)
Shareholders who currently own Shares of HighMark's Equity or Income Funds that
were purchased prior to June 20, 1994 within an account registered in their name
with the Funds; and (iv) present and retired directors, officers and employees
(and their spouses and children under the age of 21) of Union Bank of
California, N.A., HighMark's current or former distributors or their respective
affiliated companies who currently own Shares of HighMark Funds which were
purchased before April 30, 1997.
 
  This Prospectus sets forth concisely the information about HighMark and the
Balanced Fund that a prospective investor should know before investing.
Investors are advised to read this Prospectus and retain it for future
reference. A Statement of Additional Information dated the same date as this
Prospectus has been filed with the Securities and Exchange Commission and is
available without charge by writing the Distributor, SEI Financial Services
Company, Oaks, Pennsylvania 19456, or by calling 1-800-433-6884. The Statement
of Additional Information is incorporated into this Prospectus by reference.
This Prospectus relates only to the Fiduciary Shares of the Balanced Fund.
Interested persons who wish to obtain a prospectus for the other Funds of
HighMark may contact the Distributor at the above address and telephone number.
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
HIGHMARK'S SHARES ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK, INCLUDING UNION BANK OF CALIFORNIA, N.A., BANK OF
TOKYO-MITSUBISHI, LIMITED OR ANY OF THEIR AFFILIATES OR CORRESPONDENTS.
HIGHMARK'S SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE
CORPORATION OR ANY OTHER GOVERNMENT AGENCY. INVESTMENT IN HIGHMARK INVOLVES
RISKS, INCLUDING POSSIBLE LOSS OF THE PRINCIPAL AMOUNT INVESTED.
 
February 26, 1997
Fiduciary Shares
<PAGE>   190
 
                                    SUMMARY
 
HIGHMARK FUNDS ("HighMark") is an open-end, diversified, registered investment
company providing a convenient way to invest in professionally managed
portfolios of securities. The following provides basic information about the
Fiduciary Shares of HighMark Balanced Fund (the "Balanced Fund" or the "Fund").
This summary is qualified in its entirety by reference to the more detailed
information provided elsewhere in the Prospectus and in the Statement of
Additional Information.
 
WHAT IS THE FUND'S INVESTMENT OBJECTIVE? The Balanced Fund seeks capital
appreciation and income, with a secondary investment objective of conservation
of capital. (See "INVESTMENT OBJECTIVE").
 
WHAT ARE THE FUND'S PERMITTED INVESTMENTS? The Fund primarily invests,
consistent with its investment objective, in equity securities including common
stocks and securities convertible into common stocks. The Fund may also invest
consistent with its investment objective and investment policies in fixed-income
securities. (See "INVESTMENT POLICIES").
 
WHAT ARE THE RISKS INVOLVED WITH AN INVESTMENT IN THE BALANCED FUND? The
investment policies of the Fund entail certain risks and considerations of which
an investor should be aware. The Fund may purchase common stocks and other
equity securities that are volatile and which may fluctuate in value more than
other types of investments. Values of fixed income securities and,
correspondingly, share prices of Funds invested in such securities, tend to vary
inversely with interest rates, and may be affected by other market and economic
factors as well. (See "Risk Factors").
 
ARE MY INVESTMENTS INSURED? HighMark's Shares are not federally insured by the
FDIC or any other government agency. Any guarantee by the U.S. Government, its
agencies or any instrumentalities of the securities in which the Fund invests
guarantees only the payment of principal and interest on the guaranteed
security, and does not guarantee the total return or value of the security or
total return or value of Shares of the Fund.
 
WHO IS THE ADVISOR? Pacific Alliance Capital Management, a division of Union
Bank of California, N.A., serves as the Advisor to HighMark. (See "The
Advisor").
 
WHO IS THE ADMINISTRATOR? SEI Fund Resources serves as the Administrator of
HighMark. (See "The Administrator").
 
WHO IS THE CUSTODIAN? Union Bank of California, N.A. (the "Bank") serves as the
custodian of HighMark's assets. (See "The Custodian").
 
WHO IS THE DISTRIBUTOR? SEI Financial Services Company acts as distributor of
HighMark's Shares. (See "The Distributor").
 
HOW DO I PURCHASE AND REDEEM SHARES? Purchases and redemptions may be made
through the Distributor on days on which both the New York Stock Exchange and
the Federal Reserve wire system are open for business ("Business Days"). The
minimum initial investment is generally $1,000. A purchase order will be
effective if the Distributor receives an order prior to 1:00 p.m., Pacific time
(4:00 p.m., Eastern time). Purchase orders for Shares will be executed at a per
Share price equal to the asset value next determined after the purchase order is
effective. Redemption orders must be placed prior to 1:00 p.m., Pacific time
(4:00 p.m., Eastern time) on any Business Day for the order to be effective that
day. (See "PURCHASE AND REDEMPTION OF SHARES").
 
                                        2
<PAGE>   191
 
HOW ARE DIVIDENDS PAID? Substantially all of the net investment income
(exclusive of capital gains) of the Fund is distributed in the form of monthly
dividends to Shareholders of record. Any capital gain is distributed at least
annually. Distributions are paid in additional Shares unless the Shareholder
elects to take the payment in cash. (See "DIVIDENDS").
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
Summary...............................................................................    2
Balanced Fund Fee Table...............................................................    4
Financial Highlights..................................................................    5
Fund Description......................................................................    6
Investment Objective..................................................................    6
Investment Policies...................................................................    6
General...............................................................................    7
  Money Market Instruments............................................................    7
  Illiquid and Restricted Securities..................................................    7
  Lending of Portfolio Securities.....................................................    7
  Other Investments...................................................................    8
  Risk Factors........................................................................    9
Investment Limitations................................................................   11
  Portfolio Turnover..................................................................   12
Purchase and Redemption of Shares.....................................................   12
Exchange Privileges...................................................................   14
Dividends.............................................................................   15
Federal Taxation......................................................................   15
Service Arrangements..................................................................   17
  The Advisor.........................................................................   17
  Administrator.......................................................................   18
  The Transfer Agent..................................................................   18
  Shareholder Service Plan............................................................   18
  Distributor.........................................................................   19
  Banking Laws........................................................................   19
  Custodian...........................................................................   19
General Information...................................................................   19
  Description of HighMark & Its Shares................................................   19
  Performance Information.............................................................   20
  Miscellaneous.......................................................................   21
Description of Permitted Investments..................................................   22
</TABLE>
 
                                        3
<PAGE>   192
 
                            BALANCED FUND FEE TABLE
 
<TABLE>
<CAPTION>
                                                                                                      BALANCED FUND
                                                                                                        FIDUCIARY
                                                                                                         SHARES
                                                                                                      -------------
<S>                                                                                                   <C>
SHAREHOLDER TRANSACTION EXPENSES(A)
  Maximum Sales Load Imposed on Purchases (as a percentage of offering price).......................         0%
  Maximum Sales Load Imposed on Reinvested Dividends (as a percentage of offering price)............         0%
  Deferred Sales Load (as a percentage of original purchase price or redemption proceeds, as                 0%
    applicable).....................................................................................
  Redemption Fees (as a percentage of amount redeemed, if applicable)(b)............................         0%
  Exchange Fee(a)...................................................................................      $   0
ANNUAL OPERATING EXPENSES
  (as a percentage of net assets)
  Management Fees...................................................................................      0.60%
  12b-1 Fees........................................................................................      0.00%
  Other Expenses (after voluntary reduction)(c).....................................................      0.30%
                                                                                                       --------
  Total Fund Operating Expenses(d)..................................................................      0.90%
                                                                                                       ========
</TABLE>
 
  EXAMPLE: You would pay the following expenses on a $1,000 investment, assuming
(1) 5% annual return and (2) redemption at the end of each time period.
 
<TABLE>
<CAPTION>
                                                                 1 YEAR   3 YEARS   5 YEARS   10 YEARS
                                                                 ------   -------   -------   --------
<S>                                                              <C>      <C>       <C>       <C>
Balanced Fund Fiduciary Shares..................................   $9       $29       $50       $111
</TABLE>
 
  The purpose of the table above is to assist an investor in the Balanced Fund
in understanding the various costs and expenses that a Shareholder will bear
directly or indirectly. For a more complete discussion of the Fund's annual
operating expenses, see SERVICE ARRANGEMENTS below. THE FOREGOING EXAMPLE SHOULD
NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE EXPENSES. ACTUAL EXPENSES
MAY BE GREATER OR LESS THAN THOSE SHOWN.
- ---------------
 
(a) Certain entities (including Union Bank of California and its affiliates)
    making investments in the Balanced Fund on behalf of their customers may
    charge customers fees for services provided in connection with the
    investment in, redemption of, and exchange of Shares. (See PURCHASE AND
    REDEMPTION OF SHARES, EXCHANGE PRIVILEGES, and SERVICE ARRANGEMENTS--
    below.)
 
(b) A wire redemption charge is deducted from the amount of a wire redemption
    payment made at the request of a Shareholder. (See PURCHASE AND REDEMPTION
    OF SHARES below.)
 
(c) Absent voluntary fee waivers, OTHER EXPENSES would be 0.48% for the
    Fiduciary Shares of the Balanced Fund.
 
(d) Absent voluntary fee waivers, TOTAL FUND OPERATING EXPENSES would be 1.08%
    for the Fiduciary Shares of the Balanced Fund.
 
                                        4
<PAGE>   193
 
                              FINANCIAL HIGHLIGHTS
 
  The table below sets forth certain financial information with respect to the
Fiduciary Shares of the Balanced Fund. Financial highlights for the Fund for the
period ended July 31, 1996 have been derived from financial statements audited
by Deloitte & Touche LLP, independent auditors for HighMark, whose report
thereon is included in the Statement of Additional Information. Prior to the
fiscal year ended July 31, 1996, Coopers & Lybrand L.L.P. served as independent
accountants for HighMark.
 
  Prior to June 20, 1994, the Balanced Fund offered a single class of Shares
(now designated Fiduciary Shares) throughout the periods shown.
 
                                 BALANCED FUND
 
<TABLE>
<CAPTION>
                                                                                     NOV. 14,
                                                                                      1993 TO
                                                        YEAR ENDED JULY 31,          JULY 31,
                                                     -------------------------       ---------
                                                       1996            1995           1994(A)
                                                     FIDUCIARY       FIDUCIARY       FIDUCIARY
                                                     ---------       ---------       ---------
<S>                                                  <C>             <C>             <C>
Net Asset Value,
  Beginning of Period..............................   $ 10.85         $  9.76         $ 10.00
                                                      -------         -------         -------
Investment Activities
  Net investment income............................      0.40            0.39            0.26
  Net realized and unrealized gains (losses) on
     investments...................................      0.79            1.09           (0.24)
                                                      -------         -------         -------
     Total from Investment Activities..............      1.19            1.48            0.02
                                                      -------         -------         -------
Distributions
  Net investment income............................     (0.40)          (0.39)          (0.26)
                                                      -------         -------         -------
Net Asset Value, End of Period.....................   $ 11.64         $ 10.85         $  9.76
                                                      =======         =======         =======
Total Return.......................................     11.06%          15.62%          (0.26)%(d)
Ratios/Supplementary Data:
Net Assets at end of period (000)..................   $39,502         $29,961         $25,851
Ratio of expenses to average net assets............      0.94%           0.89%           0.87%(b)
Ratio of net investment income to average net
  assets...........................................      3.49%           3.93%           3.77%(b)
Ratio of expenses to average net assets*...........      1.78%           1.80%           1.79%(b)
Ratio of net investment income to average net
  assets*..........................................      2.65%           3.02%           2.85%(b)
Portfolio turnover (c).............................     12.84%          20.70%          44.14%
</TABLE>
 
- ---------
(a) Period from commencement of operations. On June 20, 1994, the Balanced Fund
    commenced offering Investor Shares (now called "Retail Shares") and
    designated existing shares as Fiduciary Shares.
(b) Annualized.
(c) Portfolio turnover is calculated on the basis of the Fund as a whole without
    distinguishing between the classes of shares issued.
(d) Not annualized.
 
                                        5
<PAGE>   194
 
FUND
DESCRIPTION             HighMark Funds ("HighMark") is an open-end, diversified,
                      registered investment company that currently offers units
                      of beneficial interest ("Shares") in sixteen separate
                      investment portfolios ("Funds"). All of the Funds are
                      advised by Pacific Alliance Capital Management (the
                      "Advisor"), a division of Union Bank of California, N.A.
                      Shareholders may purchase Shares of selected Funds through
                      two separate classes (the "Retail" and "Fiduciary"
                      classes). These classes may have different sales charges
                      and other expenses, which may affect performance.
                      Information regarding HighMark's other Funds and other
                      classes is contained in separate prospectuses that may be
                      obtained from HighMark's Distributor, SEI Financial
                      Services Company, at Oaks, Pennsylvania 19456, or by
                      calling 1-800-433-6884.
 
                        For information concerning those investors who qualify
                      to purchase Fiduciary Shares, see PURCHASE AND REDEMPTION
                      OF SHARES below. (Fiduciary Shares may be hereinafter
                      referred to as "Shares.")
 
INVESTMENT
OBJECTIVE               The Balanced Fund seeks capital appreciation and income.
                      Conservation of capital is a secondary consideration.
 
                        The investment objective and certain of the investment
                      limitations of the Balanced Fund may not be changed
                      without a vote of the holders of a majority of the
                      outstanding Shares of the Fund (as defined under GENERAL
                      INFORMATION--Miscellaneous below). There can be no
                      assurance that the Fund will achieve its investment
                      objective.
 
INVESTMENT
POLICIES                The Balanced Fund may invest in any type or class of
                      security. Under normal market conditions, the Balanced
                      Fund will invest between 50% and 70% of its total assets
                      in equity securities. Senior fixed-income securities will
                      normally constitute at least 25% of the Balanced Fund's
                      net assets.
 
                        Equity securities include common stocks, warrants to
                      purchase common stocks, American Depositary Receipts
                      ("ADRs"), preferred stocks, securities (including debt
                      securities) convertible into or exercisable for common
                      stocks and Standard & Poor's Depositary Receipts
                      ("SPDRs"). The Balanced Fund's fixed-income investments
                      consist of bonds, debentures, notes, zero-coupon
                      securities, all forms of mortgage-related securities
                      (including collateralized mortgage obligations), and
                      obligations issued or guaranteed by the U.S. or foreign
                      Governments or their agencies or instrumentalities.
                      Privately issued mortgage-backed securities must be rated
                      in one of the top two categories by at least one NRSRO as
                      defined below. In addition to mortgage-backed securities,
                      the Balanced Fund may invest in other asset-backed
                      securities including, but not limited to, those backed by
                      company receivables, truck and auto loans, leases, and
                      credit card or other receivables.
 
                                        6
<PAGE>   195
 
                        The Balanced Fund may invest in bonds, notes and
                      debentures of any maturity issued by U.S. and foreign
                      corporate and governmental issuers. The Balanced Fund will
                      invest only in corporate fixed-income securities that are
                      rated at the time of purchase as investment grade by a
                      nationally recognized statistical rating organization
                      ("NRSRO") (e.g., at least Baa from Moody's Investors
                      Service, Inc. ("Moody's") or BBB from Standard & Poor's
                      Corporation ("S&P")) or, if unrated, which the Advisor
                      deems to be attractive opportunities and of comparable
                      quality. For a description of the rating symbols of the
                      NRSROs utilized by the Advisor, see the Appendix to the
                      Statement of Additional Information.
 
                        In the event that a security owned by the Fund is
                      downgraded below the stated rating categories, the Advisor
                      will take appropriate action with regard to that security.
 
                        The portions of the Balanced Fund's assets invested in
                      equity securities and fixed-income securities will vary
                      from time to time within the stated ranges, depending upon
                      the Advisor's assessment of business, economic and market
                      conditions. The Advisor considers a combination of risk,
                      capital appreciation, income, and protection of capital
                      value.
 
GENERAL               Money Market Instruments
                        Under normal market conditions, the Balanced Fund may
                      invest up to 35% of its total assets in money market
                      instruments. When market conditions indicate a temporary
                      "defensive" investment strategy as determined by the
                      Advisor, the Fund may invest more than 35% of its total
                      assets in money market instruments. The Fund will not be
                      pursuing its investment objective to the extent that a
                      substantial portion of its assets are invested in money
                      market instruments.
 
                      Illiquid and Restricted Securities
                        The Balanced Fund shall limit investment in illiquid
                      securities to 15% or less of its net assets. Generally, an
                      "illiquid security" is any security that cannot be
                      disposed of promptly and in the ordinary course of
                      business at approximately the amount at which the Fund has
                      valued the instrument. The absence of a trading market can
                      make it difficult to ascertain the market value of
                      illiquid securities. The Fund may purchase restricted
                      securities which have not been registered under the
                      Securities Act of 1933 (e.g., Rule 144A Securities and
                      Section 4(2) commercial paper) subject to policies
                      approved by the Board of Trustees. See INVESTMENT
                      RESTRICTIONS in the Statement of Additional Information.
 
                      Lending of Portfolio Securities
                        In order to generate additional income, the Fund may
                      lend its portfolio securities to broker-dealers, banks or
                      other institutions. The Fund may lend
 
                                        7
<PAGE>   196
 
                      portfolio securities in an amount representing up to
                      33 1/3% of the value of the Fund's total assets.
 
                      Other Investments
                        The Fund may enter into repurchase agreements and
                      reverse repurchase agreements.
 
                        The Balanced Fund may enter into forward commitments or
                      purchase securities on a "when-issued" basis. The Balanced
                      Fund expects that commitments by it to enter into forward
                      commitments or purchase when-issued securities will not
                      exceed 25% of the value of the Fund's total assets under
                      normal market conditions. The Fund does not intend to
                      purchase when-issued securities or forward commitments for
                      speculative or leveraging purposes but only for the
                      purpose of acquiring portfolio securities.
 
                        The Fund may also invest in money market instruments,
                      money market funds, and in cash, and may invest in other
                      registered investment companies with similar investment
                      objectives.
 
                        The Balanced Fund may invest up to 5% of its total
                      assets in the shares of any one registered investment
                      company, but may not own more than 3% of the securities of
                      any one registered investment company or invest more than
                      10% of its assets in the securities of other registered
                      investment companies. In accordance with an exemptive
                      order issued to HighMark by the SEC, such other registered
                      investment company securities may include shares of a
                      money market fund of HighMark, and may include registered
                      investment companies for which the Advisor or Sub-Advisor
                      to a Fund of HighMark, or an affiliate of such Advisor or
                      Sub-Advisor, serves as investment advisor, administrator
                      or distributor. Because other registered investment
                      companies employ an investment advisor, such investment by
                      a Fund may cause Shareholders to bear duplicative fees.
                      The Advisor will waive its fees attributable to the assets
                      of the investing Fund invested in a money market fund of
                      HighMark, and, to the extent required by applicable law,
                      the Advisor will waive its fees attributable to the assets
                      of the Fund invested in any investment company. Some Funds
                      are subject to additional restrictions on investment in
                      other investment companies. See "INVESTMENT RESTRICTIONS"
                      in the Statement of Additional Information.
 
                        The Balanced Fund may write covered calls on its equity
                      securities and enter into closing transactions with
                      respect to covered call options.
 
                        The Fund may also buy and sell options, futures
                      contracts and options on futures. The Fund may enter into
                      futures contracts and options on futures only to the
                      extent that obligations under such contracts or
                      transactions, together with options on securities,
                      represent not more than 25% of the Fund's assets. The
 
                                        8
<PAGE>   197
 
                      aggregate value of options on securities (long puts and
                      calls) will not exceed 10% of the Fund's net assets at the
                      time such options are purchased by the Fund.
 
                        The Fund may purchase options in stock indices to invest
                      cash on an interim basis. The aggregate premium paid on
                      all options on stock indices cannot exceed 20% of the
                      Fund's total assets.
 
                        All of the common stocks in which the Balanced Fund
                      invests (including foreign securities in the form of ADRs
                      but not including Rule 144A Securities) are traded on
                      registered exchanges or in the over-the-counter market.
 
                        For further information, see "DESCRIPTION OF PERMITTED
                      INVESTMENTS."
 
                      Risk Factors
                        Like any investment program, investment in the Balanced
                      Fund entails certain risks. As with a fund investing
                      primarily in equity securities, the Balanced Fund is
                      subject to the risk that prices of equity securities, or
                      certain types of equity securities in which the Fund
                      invests, in general will decline over short or even
                      extended periods. Since the Fund's shares will fluctuate
                      in value, the Fund may be more suitable for long-term
                      investors who can bear the risk of short-term
                      fluctuations. In addition, the market value of
                      fixed-income securities bears an inverse relationship to
                      changes in market interest rates, which may affect the net
                      asset value of Shares. The longer the remaining maturity
                      of a security, the greater is the effect of interest rate
                      changes on its market value. Generally, because of their
                      fixed-income features, convertible securities will
                      fluctuate in value to a lesser degree than the common
                      stocks into which they are convertible. Changes in the
                      value of a Fund's fixed-income securities will not affect
                      cash income received from ownership of such securities,
                      but will affect a Fund's net asset value.
 
                        Because the Balanced Fund also invests in debt
                      securities, investors in the Balanced Fund are also
                      exposed to credit risk, which relates to the ability of an
                      issuer to make payments of principal and interest, and
                      market risk, which relates to changes in a security's
                      value as a result of interest rate changes generally. An
                      increase in interest rates will generally reduce the value
                      of the investments in the Balanced Fund and a decline in
                      interest rates will generally increase the value of those
                      investments. Accordingly, the net asset value of the
                      Fund's shares will vary as a result of changes in the
                      value of the securities in the Fund's portfolio.
                      Therefore, an investment in the Fund may decline in value,
                      resulting in a loss of principal. Because interest rates
                      vary, it is impossible to predict the income or yield of
                      the Fund for any particular period. While debt securities
                      normally fluctuate less in price than equity securities,
                      there have been extended periods of cyclical increases in
                      interest rates that have caused significant declines in
                      debt securities prices. Certain fixed-income securities
                      which may be purchased by the
 
                                        9
<PAGE>   198
 
                      Balanced Fund such as zero-coupon obligations,
                      mortgage-backed and asset-backed securities, and
                      collateralized mortgage obligations ("CMOs") will have
                      greater price volatility then other fixed-income
                      obligations. Because declining interest rates may lead to
                      prepayment of underlying mortgages, automobile sales
                      contracts or credit card receivables, the prices of
                      mortgage-related and asset-backed securities may not rise
                      with a decline in interest rates. Mortgage-backed and
                      asset-backed securities and CMOs are extremely sensitive
                      to the rate of principal prepayment. Similarly, callable
                      corporate bonds also present risk of prepayment. During
                      periods of falling interest rates, securities that can be
                      called or prepaid may decline in value relative to similar
                      securities that are not subject to call or prepayment.
 
                        Depending upon prevailing market conditions, the
                      Balanced Fund may purchase debt securities at a discount
                      from face value, which produces a yield greater than the
                      coupon rate. Conversely, if debt securities are purchased
                      at premium over face value, the yield will be lower than
                      the coupon rate. In making investment decisions, the
                      Advisor will consider many factors other than current
                      yield, including the preservation of capital, the
                      potential for realizing capital appreciation, maturity,
                      and yield to maturity. From time to time, the equity and
                      debt markets may fluctuate independently of one another.
                      In other words, a decline in equity markets may in certain
                      instances be offset by a rise in debt markets, or vice
                      versa. As a result, the Balanced Fund, with its balance of
                      equity and debt investments, may entail less investment
                      risk (and a potentially smaller investment return) than a
                      mutual fund investing primarily in equity securities.
 
                        As described above, the Balanced Fund may invest in debt
                      securities within the four highest rating categories
                      assigned by a NRSRO and comparable unrated securities.
                      Securities rated BBB by S&P or Baa by Moody's are
                      considered investment grade, but are deemed by these
                      rating services to have some speculative characteristics,
                      and adverse economic conditions or other circumstances are
                      more likely to lead to a weakened capacity to make
                      principal and interest payments than is the case with
                      higher-grade bonds. Should subsequent events cause the
                      rating of a debt security purchased by the Balanced Fund
                      to fall below the fourth highest rating category, the
                      Advisor will consider such an event in determining whether
                      the Balanced Fund should continue to hold that security.
                      In no event, however, would the Balanced Fund be required
                      to liquidate any such portfolio security where the
                      Balanced Fund would suffer a loss on the sale of such
                      security.
 
                        The Balanced Fund may invest in convertible securities,
                      which include corporate bonds, notes or preferred stocks
                      that can be converted into common stocks or other equity
                      securities. Convertible securities also include other
                      securities, such as warrants, that provide an opportunity
                      for equity participation. Because convertible
 
                                       10
<PAGE>   199
 
                      securities can be converted into common stock, their
                      values will normally vary in some proportion with those of
                      the underlying common stock. Convertible securities
                      usually provide a higher yield than the underlying common
                      stock, however, so that the price decline of a convertible
                      security may sometimes be less substantial than that of
                      the underlying common stock. The value of convertible
                      securities that pay dividends or interest, like the value
                      of all fixed-income securities, generally fluctuates
                      inversely with changes in interest rates. Warrants have no
                      voting rights, pay no dividends and have no rights with
                      respect to the assets of the corporation issuing them.
                      They do not represent ownership of the securities for
                      which they are exercisable, but only the right to buy such
                      securities at a particular price. The Balanced Fund will
                      not purchase any convertible debt security or convertible
                      preferred stock unless it has been rated as investment
                      grade at the time of acquisition by a NRSRO or that is not
                      rated but is determined to be of comparable quality by the
                      Advisor.
 
                        The Balanced Fund may invest in securities issued or
                      guaranteed by foreign corporations or foreign governments,
                      their political subdivisions, agencies or
                      instrumentalities and obligations of supranational
                      entities such as the World Bank and the Asian Development
                      Bank. Any investments in these securities will be in
                      accordance with the Fund's investment objective and
                      policies, and are subject to special risks, such as
                      adverse political and economic developments, possible
                      seizure, nationalization or expropriation of foreign
                      investments, less stringent disclosure requirements,
                      changes in foreign currency exchange rates, increased
                      costs associated with the conversion of foreign currency
                      into U.S. dollars, the possible establishment of exchange
                      controls or taxation at the source or the adoption of
                      other foreign governmental restrictions. To the extent
                      that the Fund may invest in securities of foreign issuers
                      that are not traded on any exchange, there is a further
                      risk that these securities may not be readily marketable.
                      The Balanced Fund will not hold foreign currency for
                      investment purposes.
 
INVESTMENT
LIMITATIONS             The Balanced Fund may not:
 
                        1) Purchase securities of any one issuer, other than
                      obligations issued or guaranteed by the U.S. Government,
                      its agencies, or instrumentalities, if, immediately after
                      the purchase, more than 5% of the value of the Fund's
                      total assets would be invested in the issuer or the Fund
                      would hold more than 10% of any class of securities of the
                      issuer or more than 10% of the issuer's outstanding voting
                      securities (except that up to 25% of the value of the
                      Fund's total assets may be invested without regard to
                      these limitations);
 
                        2) Purchase any securities that would cause more than
                      25% of the Fund's total assets at the time of purchase to
                      be invested in securities of one or more issuers
                      conducting their principal business activities in the same
                      industry, provided that (a) there is no limitation with
                      respect to obligations issued or guaranteed by the
 
                                       11
<PAGE>   200
 
                      U.S. or foreign governments or their agencies or
                      instrumentalities and repurchase agreements secured by
                      obligations of the U.S. Government or its agencies or
                      instrumentalities; (b) wholly owned finance companies will
                      be considered to be in the industries of their parents if
                      their activities are primarily related to financing the
                      activities of their parents; and (c) utilities will be
                      divided according to their services (for example, gas, gas
                      transmission, electric and gas, electric, and telephone
                      will each be considered a separate industry);
 
                        3) Make loans, except that the Fund may purchase or hold
                      debt instruments, lend portfolio securities, and enter
                      into repurchase agreements in accordance with its
                      investment objective and policies.
 
                        The foregoing percentages will apply at the time of the
                      purchase of a security. The investment limitations listed
                      above are fundamental policies the substance of which may
                      not be changed without a vote of a majority of the
                      outstanding Shares of the Fund. Additional fundamental and
                      non-fundamental investment limitations are set forth in
                      the Statement of Additional Information.
 
                      Portfolio Turnover
                        The Fund's portfolio turnover rate will not be a factor
                      preventing a sale or purchase when the Advisor believes
                      investment considerations warrant. The Fund's portfolio
                      turnover rate may vary greatly from year to year as well
                      as within a particular year. High portfolio turnover rates
                      generally will result in correspondingly higher brokerage
                      and other transactions costs to the Fund and could involve
                      the realization of capital gains that would be taxable
                      when distributed to Shareholders of the Fund. See FEDERAL
                      TAXATION.
 
PURCHASE AND
REDEMPTION
OF SHARES               As noted above, the Fund is divided into two classes of
                      Shares, Retail and Fiduciary. Fiduciary Shares may be
                      purchased at net asset value. Only the following investors
                      qualify to purchase the Balanced Fund's Fiduciary Shares:
                      (i) fiduciary, advisory, agency, custodial and other
                      similar accounts maintained with Union Bank of California,
                      N.A. or its affiliates; (ii) SelectIRA accounts
                      established with The Bank of California, N.A. and invested
                      in any of HighMark's Equity or Income Funds prior to June
                      20, 1994, which have remained continuously open thereafter
                      and which are not considered to be fiduciary accounts;
                      (iii) Shareholders who currently own Shares of HighMark's
                      Equity or Income Funds that were purchased prior to June
                      20, 1994 within an account registered in their name with
                      the Funds. For a description of investors who qualify to
                      purchase Retail Shares, see the Retail Shares prospectus
                      of the Balanced Fund; and (iv) present and retired
                      directors, officers and employees (and their spouses and
                      children under the age of 21 of Union Bank of California,
                      N.A., HighMark's current or former distributors or their
                      respective affiliated companies who cur-
 
                                       12
<PAGE>   201
 
                      rently own Shares of HighMark Funds which were purchased
                      before April 30, 1997.
 
                        Purchases and redemptions of Shares of the Balanced Fund
                      may be made on days on which both the New York Stock
                      Exchange and Federal Reserve wire system are open for
                      business ("Business Days"). The minimum initial investment
                      is generally $1,000 and the minimum subsequent investment
                      is generally only $100. For present and retired directors,
                      officers, and employees (and their spouses and children
                      under the age of 21) of Union Bank of California, SEI
                      Financial Services Company and their affiliates, the
                      minimum initial investment is $250 and the minimum
                      subsequent investment is $50. The Fund's initial and
                      subsequent minimum purchase amounts may be waived if
                      purchases are made in connection with Individual
                      Retirement Accounts, Keoghs, payroll deduction plans, or
                      401(k) or similar plans. However, the minimum investment
                      may be waived in the Distributor's discretion.
                      Shareholders may place orders by telephone.
 
                        Purchase orders will be effective if the Distributor
                      receives an order before 1:00 p.m., Pacific time (4:00
                      p.m., Eastern time) and the custodian receives Federal
                      funds before the close of business on the next Business
                      Day. The purchase price of Shares of a Fund is the net
                      asset value next determined after a purchase order is
                      received and accepted by HighMark. The net asset value per
                      Share of a Fund is determined by dividing the total market
                      value of a Fund's investments and other assets, less any
                      liabilities, by the total number of out-
                      standing Shares of a Fund. Net asset value per share is
                      determined daily as of 1:00 p.m., Pacific time (4:00 p.m.,
                      Eastern time) on any Business Day. Purchases will be made
                      in full and fractional shares of HighMark calculated to
                      three decimal places. HighMark reserves the right to
                      reject a purchase order when the Distributor determines
                      that it is not in the best interest of HighMark and/or its
                      Shareholders to accept such order.
 
                        Shares of the Balanced Fund are offered only to
                      residents of states in which the shares are eligible for
                      purchase.
 
                        Shareholders who desire to redeem shares of HighMark
                      must place their redemption orders prior to 1:00 p.m.,
                      Pacific time (4:00 p.m., Eastern time), on any Business
                      Day for the order to be accepted on that Business Day. The
                      redemption price is the net asset value of the Fund next
                      determined after receipt by the Distributor of the
                      redemption order. Payment on redemption will be made as
                      promptly as possible and, in any event, within seven
                      calendar days after the redemption order is received. The
                      Fund reserves the right to make payment for redemptions in
                      securities rather than cash.
 
                                       13
<PAGE>   202
 
                        Neither HighMark's transfer agent nor HighMark will be
                      responsible for any loss, liability, cost or expense for
                      acting upon wire instructions or upon telephone
                      instructions that it reasonably believes to be genuine.
                      HighMark and its transfer agent will each employ
                      reasonable procedures to confirm that telephone
                      instructions are genuine. Such procedures may include
                      taping of telephone conversations. If market conditions
                      are extraordinarily active or other extraordinary
                      circumstances exist, and you experience difficulties
                      placing redemption orders by telephone, you may wish to
                      consider placing your order by other means.
 
EXCHANGE
PRIVILEGES              As indicated under GENERAL INFORMATION--Description of
                      HighMark & Its Shares, certain of HighMark's Funds issue
                      two classes of Shares (Retail Shares and Fiduciary
                      Shares); as of the date of this Prospectus, the
                      Distribution Plan and distribution fee payable thereunder
                      are applicable only to such Fund's Retail Shares. A
                      Shareholder's eligibility to exchange into a particular
                      class of Shares will be determined at the time of the
                      exchange. The Shareholder must supply, at the time of the
                      exchange, the necessary information to permit confirmation
                      of qualification.
 
                        Each Fund's Shares may be exchanged for Shares of the
                      class of the various other Funds of HighMark which the
                      Shareholder qualifies to purchase directly so long as the
                      Shareholder maintains the applicable minimum account
                      balance in each Fund in which he or she owns Shares and
                      satisfies the minimum initial and subsequent purchase
                      amounts of the Fund into which the Shares are exchanged.
                      Shareholders may exchange their Fiduciary Shares for
                      Fiduciary Shares of another Fund on the basis of the
                      relative net asset value of the Fiduciary Shares
                      exchanged. Shareholders may also exchange Fiduciary Shares
                      of a Fund for Retail Shares of another Fund. Under such
                      circumstances, the cost of the acquired Retail Shares will
                      be the net asset value per share plus the appropriate
                      sales load.
 
                        Exchanges will be made on the basis of the relative net
                      asset values of the Shares exchanged plus any applicable
                      sales charge. Exchanges are subject to the terms and
                      conditions stated herein and the terms and conditions
                      stated in the respective prospectuses of the Funds.
 
                        Certain entities (including participating organizations
                      and Union Bank of California and its affiliates), however,
                      may charge customers a fee with respect to exchanges made
                      on the customer's behalf. Information about these charges,
                      if any, can be obtained by the entity effecting the
                      exchange and this Prospectus should be read in conjunction
                      with that information.
 
                        A Shareholder wishing to exchange Shares in the Balanced
                      Fund may do so by contacting the transfer agent at
                      1-800-433-6884. Exchanges will be effected on
 
                                       14
<PAGE>   203
 
                      any Business Day at the net asset value of the Funds
                      involved in the exchange next determined after the
                      exchange request is received by the transfer agent.
 
                        An exchange is considered to be a sale of Shares for
                      federal income tax purposes on which a Shareholder may
                      realize a capital gain or loss. Exchange privileges may be
                      exercised only in those states where Shares of such other
                      Funds of HighMark may legally be sold. HighMark may
                      materially amend or terminate the exchange privileges
                      described herein upon sixty days' notice.
 
DIVIDENDS               The net income of the Balanced Fund is declared and paid
                      monthly as a dividend to Shareholders of record at the
                      close of business on the day of declaration. Net realized
                      capital gains are distributed at least annually to
                      Shareholders of record.
 
                        Shareholders will automatically receive all income
                      dividends and capital gains distributions in additional
                      full and fractional Shares of the Fund at net asset value
                      as of the date of declaration (which is also the
                      ex-dividend date), unless the Shareholder elects to
                      receive such dividends or distributions in cash.
                      Shareholders wishing to receive their dividends in cash
                      (or wishing to revoke a previously made election) must
                      notify the transfer agent at P.O. Box 8416, Boston, MA
                      02266-8416, and such election (or revocation thereof) will
                      become effective with respect to dividends and
                      distributions having record dates after notice has been
                      received. Dividends paid in additional Shares receive the
                      same tax treatment as dividends paid in cash.
 
FEDERAL
TAXATION                The Balanced Fund intends to qualify for treatment as a
                      "regulated investment company" under the Internal Revenue
                      Code of 1986, as amended (the "Code"), and to distribute
                      substantially all of its net investment income and net
                      realized capital gains so that the Fund is not required to
                      pay federal taxes on these amounts.
 
                        Distributions of ordinary income and/or an excess of net
                      short-term capital gain over net long-term capital loss
                      are treated for federal income tax purposes as ordinary
                      income to Shareholders. The 70 percent dividends received
                      deduction for corporations generally will apply to these
                      distributions to the extent the distribution represents
                      amounts that would qualify for the dividends received
                      deduction when received by the Fund if the Fund were a
                      regular corporation, and to the extent designated by the
                      Fund as so qualifying. Distributions by the Fund of the
                      excess of net long-term capital gain over net short-term
                      capital loss is taxable to Shareholders as long-term
                      capital gain in the year with respect to which it is
                      received, regardless of how long the Shareholder has held
                      Shares of the Fund. Such distributions are not eligible
                      for the dividends received deduction. If a Shareholder
                      disposes of Shares in the Fund at a loss before holding
                      such Shares for longer than six months, such loss will be
                      treated as a long-term capital
 
                                       15
<PAGE>   204
 
                      loss to the extent the Shareholder has received long-term
                      capital gain dividends on the Shares.
 
                        Prior to purchasing Shares of the Balanced Fund, the
                      impact of dividends or capital gain distributions that are
                      expected to be declared or have been declared, but not
                      paid, should be carefully considered. Dividends or capital
                      gain distributions received after a purchase of Shares are
                      subject to federal income taxes, although in some
                      circumstances, the dividends or distributions may be, as
                      an economic matter, a return of capital to the
                      Shareholder. A Shareholder should consult his or her
                      advisor for specific advice about the tax consequences to
                      the Shareholder of investing in the Fund.
 
                        Fund investments in foreign securities may be subject to
                      withholding taxes at the source on dividend or interest
                      payments. In that case, the Fund's yield on those
                      securities would be decreased. The Fund does not expect to
                      be eligible to elect to permit shareholders to claim a
                      credit or deduction on their income tax return for their
                      pro rata share of such taxes.
 
                        Fund transactions in foreign currencies and hedging
                      activities may give rise to ordinary income or loss to the
                      extent such income or loss results from fluctuations in
                      value of the foreign currency concerned. In addition, such
                      activities will likely produce a difference between book
                      income and taxable income. This difference may cause a
                      portion of the Fund's income distributions to constitute a
                      return of capital for tax purposes or require the Fund to
                      make distributions exceeding book income to qualify as a
                      regulated investment company for tax purposes.
 
                        Investment in an entity that qualifies as a "passive
                      foreign investment company" under the Code could subject
                      the Fund to a U.S. federal income tax or other charge on
                      certain "excess distributions" received with respect to
                      the investment, and on the proceeds from disposition of
                      the investment.
 
                        Additional information regarding federal taxes is
                      contained in the Statement of Additional Information.
                      However, the foregoing and the material in the Statement
                      of Additional Information are only brief summaries of some
                      of the important tax considerations generally affecting
                      the Fund and its Shareholders. In addition, the foregoing
                      discussion and the federal tax information in the
                      Statement of Additional Information are based on tax laws
                      and regulations which are in effect as of the date of this
                      Prospectus; these laws and regulations may subsequently
                      change, and such changes could be retroactive.
 
                        Shareholders will be advised at least annually as to the
                      federal income tax status of distributions made during the
                      year.
 
                                       16
<PAGE>   205
 
SERVICE
ARRANGEMENTS          The Advisor
                        Pacific Alliance Capital Management, a division of Union
                      Bank of California, N.A. serves as the Balanced Fund's
                      investment advisor. Subject to the general supervision of
                      HighMark's Board of Trustees, the Advisor manages the Fund
                      in accordance with its investment objective and policies,
                      makes decisions with respect to and places orders for all
                      purchases and sales of the Fund's investment securities,
                      and maintains the Fund's records relating to such
                      purchases and sales.
 
                        For the expenses assumed and services provided by the
                      Advisor as the Fund's investment advisor, Union Bank of
                      California receives a fee from the Balanced Fund, computed
                      daily and paid monthly, at the annual rate of sixty one-
                      hundredths of one percent (.60%) of the Fund's average
                      daily net assets. This fee may be higher than the advisory
                      fee paid by most mutual funds, although the Board of
                      Trustees believes it will be comparable to advisory fees
                      paid by many funds having similar objectives and policies.
                      Union Bank of California may from time to time agree to
                      voluntarily reduce its advisory fee, however, it is not
                      currently doing so. While there can be no assurance that
                      Union Bank of California will choose to make such an
                      agreement, any voluntary reductions in Union Bank of
                      California's advisory fee will lower the Fund's expenses,
                      and thus increase the Fund's yield and total return,
                      during the period such voluntary reductions are in effect.
                      During HighMark's fiscal year ended July 31, 1996, Union
                      Bank of California received investment advisory fees from
                      the Balanced Fund aggregating 0.54% of the Fund's average
                      daily net assets.
 
                        On April 1, 1996, the Bank of California, N.A.,
                      HighMark's then investment advisor, combined with Union
                      Bank and the resulting bank changed its name to Union Bank
                      of California, N.A. At the same time, the banks'
                      investment management divisions were combined. Each of
                      Union Bank and The Bank of California, N.A. (or their
                      predecessor banks) has been in banking since the early
                      1900's and, historically, each has had significant
                      investment functions within its trust and investment
                      division. UnionBanCal Corporation, the parent of Union
                      Bank of California, N.A., is a publicly held corporation,
                      but is principally held by The Bank of Tokyo-Mitsubishi,
                      Ltd. As of September 30, 1996, Union Bank of California
                      and its subsidiaries had approximately $28.7 billion in
                      commercial assets. Pacific Alliance Capital Management is
                      a division of Union Bank of California's Trust and
                      Investment Management Group which, as of June 30, 1996,
                      had approximately $13.4 billion of assets under
                      management. The Advisor, with a team of approximately 45
                      stock and bond research analysts, portfolio managers and
                      traders, has been providing investment management services
                      to individuals, institutions and large corporations since
                      1917.
 
                        All investment decisions for the Balanced Fund are made
                      by a team of investment professionals, all of whom take an
                      active part in the decision making
 
                                       17
<PAGE>   206
 
                      process. The team leader for the Balanced Fund is Carl J.
                      Colombo. Mr. Colombo is a Vice-President of the Advisor,
                      and has served as team leader for the Stepstone Balanced
                      and Growth Equity Funds. Mr. Colombo has been with the
                      Advisor and its predecessor, Union Bank, since 1985.
 
                      Administrator
                        SEI Fund Resources (the "Administrator") and HighMark
                      are parties to an administration agreement (the
                      "Administration Agreement"). Under the terms of the
                      Administration Agreement, the Administrator provides
                      HighMark with certain management services, including all
                      necessary office space, equipment, personnel, and
                      facilities.
 
                        The Administrator is entitled to a fee, which is
                      calculated daily and paid monthly, at an annual rate of
                      .20% of the average daily net assets of the Funds. The
                      Administrator may waive its fee or reimburse various
                      expenses to the extent necessary to limit the total
                      operating expenses of a Fund's Fiduciary Shares. Any such
                      waiver is voluntary and may be terminated at any time in
                      the Administrator's sole discretion. Currently, the
                      Administrator has agreed to waive its fee to the rate of
                      .18% of the average daily net assets of the Funds.
 
                        Pursuant to a separate agreement with the Administrator,
                      Union Bank of California, N.A. performs sub-administration
                      services on behalf of the Fund, for which it receives a
                      fee paid by the Administrator at the annual rate of up to
                      0.05% of the average daily net assets of the Fund. Union
                      Bank of California has voluntarily agreed to reduce this
                      fee to 0.03%, but reserves the right to terminate its
                      waiver at any time in its sole discretion. A description
                      of the services performed by Union Bank of California
                      pursuant to this Agreement is contained in the Statement
                      of Additional Information.
 
                      The Transfer Agent
                        State Street Bank and Trust Company serves as the
                      transfer agent, dividend disbursing agent, and as a
                      shareholder servicing agent for the Fiduciary Shares of
                      HighMark, for which services it receives a fee.
 
                      Shareholder Service Plan
                        To support the provision of Shareholder services to both
                      classes of Shares, HighMark has adopted a Shareholder
                      Service Plan. A description of the services performed by
                      service providers pursuant to the Shareholder Service Plan
                      is contained in the Statement of Additional Information.
                      In consideration of services provided by any service
                      provider, which may include Union Bank of California,
                      N.A., Bank of Tokyo-Mitsubishi, Ltd., or their respective
                      affiliates, the Fund may pay a fee at the rate of up to
                      0.25% of its average daily net assets to such service
                      provider. The service provider may waive such fees at any
                      time. Any
 
                                       18
<PAGE>   207
 
                      such waiver is voluntary and may be terminated at any
                      time. Currently, such fees are being waived to the rate of
                      0.09% of average daily net assets.
 
                      Distributor
                        SEI Financial Services Company (the "Distributor") and
                      HighMark are parties to a distribution agreement
                      ("Distribution Agreement"). The Distribution Agreement is
                      renewable annually and may be terminated by the
                      Distributor, by a majority vote of the Disinterested
                      Trustees or by a majority vote of the outstanding
                      securities of HighMark upon not more than 60 days written
                      notice by either party, or upon assignment by the
                      Distributor. Fiduciary Shares are not subject to
                      HighMark's Distribution Plan or a distribution fee.
 
                      Banking Laws
                        Union Bank of California believes that it may perform
                      the services for the Fund contemplated by its investment
                      advisory agreement with HighMark without a violation of
                      applicable banking laws and regulations. Union Bank of
                      California also believes that it may perform
                      sub-administration and sub-accounting services on behalf
                      of the Fund without a violation of applicable banking laws
                      and regulations. Future changes in federal or state
                      statutes and regulations relating to permissible
                      activities of banks or bank holding companies and their
                      subsidiaries and affiliates, as well as further judicial
                      or administrative decisions or interpretations of present
                      and future statutes and regulations, could change the
                      manner in which Union Bank of California or the Advisor
                      could continue to perform such services for the Fund. For
                      a further discussion of applicable banking laws and
                      regulations, see the Statement of Additional Information.
 
                      Custodian
                        Union Bank of California also serves as the custodian
                      and as a shareholder servicing agent for the Balanced
                      Fund. The Custodian holds cash, securities and other
                      assets of HighMark as required by the 1940 Act.
 
                        Services performed by Union Bank of California, as the
                      Fund's shareholder servicing agent and custodian, as well
                      as the basis of remuneration for such services, are
                      described in the Statement of Additional Information.
 
GENERAL
INFORMATION           Description of HighMark & Its Shares
                        HighMark was organized as a Massachusetts business trust
                      on March 10, 1987, and consists of sixteen series of
                      Shares open for investment representing units of
                      beneficial interest in HighMark's Growth Fund, Income
                      Equity Fund, Balanced Fund, Value Momentum Fund, Blue Chip
                      Growth Fund, Emerging Growth Fund, International Equity
                      Fund, Bond Fund, Intermediate-Term Bond Fund, Government
                      Securities Fund, Convertible Securities Fund, California
                      Intermediate Tax-Free Bond Fund, Diversified Money Market
                      Fund, U.S. Government
 
                                       19
<PAGE>   208
 
                      Obligations Money Market Fund, 100% U.S. Treasury
                      Obligations Money Market Fund, and California Tax-Free
                      Money Market Fund. As of the date hereof, no Shares of the
                      Value Momentum Fund, the Blue Chip Growth Fund, the
                      Emerging Growth Fund, the International Equity Fund, the
                      Intermediate-Term Bond Fund, the Convertible Securities
                      Fund, the Government Securities Fund and the California
                      Intermediate Tax-Free Bond Fund had been offered for sale
                      in HighMark Funds. Shares of each Fund are freely
                      transferable, are entitled to distributions from the
                      assets of the Fund as declared by the Board of Trustees,
                      and, if HighMark were liquidated, would receive a pro rata
                      share of the net assets attributable to that Fund. Shares
                      are without par value.
 
                        As noted above, pursuant to a Multiple Class Plan on
                      file with the Securities and Exchange Commission
                      permitting the issuance and sale of two classes of Shares
                      in selected Funds, Shares of such Funds have been divided
                      into two classes, designated Retail Shares and Fiduciary
                      Shares. For information regarding the Retail Shares of the
                      Balanced Fund, interested persons may contact the
                      Distributor for a prospectus at 1-800-433-6884.
 
                        HighMark believes that as of November 22, 1996, Union
                      Bank of California (475 Sansome Street, Post Office Box
                      45000, San Francisco, CA 94104) was the Shareholder of
                      record of 97.91% of the Fiduciary Shares of the Balanced
                      Fund.
 
                      Performance Information
                        From time to time, HighMark may advertise the aggregate
                      total return, average annual total return, yield and
                      distribution rate with respect to the Fiduciary Shares of
                      the Balanced Fund. Performance information is computed
                      separately for the Fund's Retail and Fiduciary Shares in
                      accordance with the formulas described below.
 
                        The aggregate total return and average annual total
                      return of the Fund may be quoted for the life of the Fund
                      and for ten-year, five-year, three-year and one-year
                      periods, in each case through the most recent calendar
                      quarter. Aggregate total return is determined by
                      calculating the change in the value of a hypothetical
                      $1,000 investment in the Fund over the applicable period
                      that would equate the initial amount invested to the
                      ending redeemable value of the investment. The ending
                      redeemable value includes dividends and capital gain
                      distributions reinvested at net asset value. Average
                      annual total return is calculated by annualizing the
                      Fund's aggregate total return over the relevant number of
                      years. The resulting percentage indicates the average
                      positive or negative investment results that an investor
                      in the Fund would have experienced on an annual basis from
                      changes in Share price and reinvestment of dividends and
                      capital gain distributions.
 
                        The yield of the Fund is determined by annualizing the
                      net investment income per Share of the Fund during a
                      specified thirty-day period and dividing that
 
                                       20
<PAGE>   209
 
                      amount by the per Share public offering price of the Fund
                      on the last day of the period.
 
                        The distribution rate of the Fund is determined by
                      dividing the income and capital gains distributions, or
                      where indicated the income distributions alone, on a Share
                      of the Fund over a twelve-month period by the per Share
                      public offering price of the Fund on the last day of the
                      period.
 
                        Each Fund may periodically compare its performance to
                      the performance of other mutual funds tracked by mutual
                      fund rating services (such as Lipper Analytical);
                      financial and business publications and periodicals; broad
                      groups of comparable mutual funds; unmanaged indices which
                      may assume investment of dividends but generally do not
                      reflect deductions for administrative and management
                      costs; or other investment alternatives. Certain Funds may
                      advertise performance that includes results from periods
                      in which the Fund's assets were managed in a
                      non-registered predecessor vehicle.
 
                        All performance information presented for the Fund is
                      based on past performance and does not predict future
                      performance.
 
                      Miscellaneous
                        Shareholders will be sent unaudited semi-annual reports
                      and annual reports audited by independent public
                      accountants.
 
                        Shareholders are entitled to one vote for each Share
                      held in a Fund as determined on the record date for any
                      action requiring a vote by the Shareholders, and a
                      proportionate fractional vote for each fractional Share
                      held. Shareholders of HighMark will vote in the aggregate
                      and not by series or class except (i) as otherwise
                      expressly required by law or when HighMark's Board of
                      Trustees determines that the matter to be voted upon
                      affects only the interests of the Shareholders of a
                      particular series or particular class, and (ii) only
                      Retail Shares will be entitled to vote on matters
                      submitted to a Shareholder vote relating to the
                      Distribution Plan. HighMark is not required to hold
                      regular annual meetings of Shareholders, but may hold
                      special meetings from time to time.
 
                        HighMark's Trustees are elected by Shareholders, except
                      that vacancies may be filled by vote of the Board of
                      Trustees. Trustees may be removed by the Board of
                      Trustees, or by Shareholders at a meeting called for such
                      purpose. For information about how Shareholders may call
                      such a meeting and communicate with other Shareholders for
                      that purpose, see ADDITIONAL INFORMATION--Miscellaneous in
                      the Statement of Additional Information.
 
                        Inquiries may be directed in writing to SEI Financial
                      Services Company, Oaks, Pennsylvania 19456, or by calling
                      toll free 1-800-433-6884.
 
                                       21
<PAGE>   210
 
DESCRIPTION OF
PERMITTED
INVESTMENTS             The following is a description of permitted investments
                      for the HighMark Balanced Fund.
 
                        AMERICAN DEPOSITARY RECEIPTS (ADRs) -- ADRs are receipts
                      typically issued by a U.S. financial institution that
                      evidence ownership of underlying securities issued by a
                      foreign issuer.
 
                        ASSET-BACKED SECURITIES (NON-MORTGAGE) -- Instruments
                      secured by company receivables, truck and auto loans,
                      leases, and credit card receivables. Such securities are
                      generally issued as pass-through certificates, which
                      represent undivided fractional ownership interests in the
                      underlying pools of assets. Such securities also may be
                      debt instruments, which are also known as collateralized
                      obligations and are generally issued as the debt of a
                      special purpose entity, such as a trust, organized solely
                      for the purpose of owning such assets and issuing such
                      debt. The purchase of non-mortgage assetbacked securities
                      raises risk considerations peculiar to the financing of
                      the instruments underlying such securities. Assetbacked
                      securities entail prepayment risk, which may vary
                      depending on the type of asset, but is generally less than
                      the prepayment risk associated with mortgage-backed
                      securities.
 
                        Like mortgages underlying mortgage-backed securities,
                      underlying automobile sales contracts or credit card
                      receivables are subject to substantial prepayment risk,
                      which may reduce the overall return to certificate
                      holders. Nevertheless, principal prepayment rates tend not
                      to vary as much in response to changes in interest rates
                      and the short-term nature of the underlying car loans or
                      other receivables tend to dampen the impact of any change
                      in the prepayment level. Certificate holders may also
                      experience delays in payment on the certificates if the
                      full amounts due on underlying sales contracts or
                      receivables are not realized by the trust because of
                      unanticipated legal or administrative costs of enforcing
                      the contracts or because of depreciation or damage to the
                      collateral (usually automobiles) securing certain
                      contracts, or other factors. If consistent with their
                      investment objectives and policies, the Fund may invest in
                      other asset-backed securities that may be developed in the
                      future.
 
                        BANKERS' ACCEPTANCES -- Bills of exchange or time drafts
                      drawn on and accepted by commercial banks. They are used
                      by corporations to finance the shipment and storage of
                      goods and to furnish dollar exchange. Maturities are
                      generally six months or less.
 
                        CERTIFICATES OF DEPOSIT -- Negotiable interest-bearing
                      instruments with a specific maturity. Certificates of
                      deposit are issued by banks and savings and loan
                      institutions in exchange for the deposit of funds and
                      normally can be traded in the secondary market prior to
                      maturity.
 
                                       22
<PAGE>   211
 
                        COMMERCIAL PAPER -- Unsecured short-term promissory
                      notes issued by corporations and other entities.
                      Maturities on these issues vary from a few days to nine
                      months. Purchase of such instruments involves a risk of
                      default by the issuer.
 
                        CONVERTIBLE BONDS AND CONVERTIBLE PREFERRED
                      STOCK -- Convertible Bonds are bonds convertible into a
                      set number of shares of another form of security (usually
                      common stock) at a prestated price. Convertible bonds have
                      characteristics similar to both fixed-income and equity
                      securities. Convertible preferred stock is a class of
                      capital stock that pays dividends at a specified rate and
                      that has preference over common stock in the payment of
                      dividends and the liquidation of assets. Convertible
                      preferred stock is preferred stock exchangeable for a
                      given number of common stock shares, and has
                      characteristics similar to both fixed-income and equity
                      securities. Because of the conversion feature, the market
                      value of convertible bonds and convertible preferred stock
                      tend to move together with the market value of the
                      underlying stock. As a result, a Fund's selection of
                      convertible bonds and convertible preferred stock is
                      based, to a great extent, on the potential for capital
                      appreciation that may exist in the underlying stock. The
                      value of convertible bonds and convertible preferred stock
                      is also affected by prevailing interest rates, the credit
                      quality of the issuer and any call provisions.
 
                        DERIVATIVES -- Instruments whose value is derived from
                      an underlying contract, index or security, or any
                      combination thereof, including futures, options (e.g.,
                      puts and calls), options on futures, swap agreements, and
                      some mortgage-backed securities (CMOs, REMICs, IOs and
                      POs). See elsewhere in this "DESCRIPTION OF PERMITTED
                      INVESTMENTS" for discussions of these various instruments,
                      and see "INVESTMENT OBJECTIVES" and "INVESTMENT POLICIES"
                      for more information about any policies and limitations
                      applicable to their use.
 
                        FUTURES AND OPTIONS ON FUTURES -- Some futures
                      strategies, including selling futures, buying puts and
                      writing calls, reduce a Fund's exposure to price
                      fluctuations. Other strategies, including buying futures,
                      writing puts and buying calls, tend to increase market
                      exposure. Futures and options may be combined with each
                      other in order to adjust the risk and return
                      characteristics of the overall portfolio.
 
                        Options and futures can be volatile instruments, and
                      involve certain risks that, if applied at an inappropriate
                      time, could negatively impact a Fund's return.
 
                        INVESTMENT GRADE BONDS -- Interest-bearing or discounted
                      government or corporate securities that obligate the
                      issuer to pay the bondholder a specified sum of money,
                      usually at specific intervals, and to repay the principal
                      amount of the loan at maturity. Investment grade bonds are
                      those rated BBB or
 
                                       23
<PAGE>   212
 
                      better by S&P or Baa or better by Moody's or similarly
                      rated by other NRSROs, or, if not rated, determined to be
                      of comparable quality by the Advisor.
 
                        MONEY MARKET INSTRUMENTS -- Short-term, debt instruments
                      or deposits and may include, for example, (i) commercial
                      paper rated within the highest rating category by a NRSRO
                      at the time of investment, or, if not rated, determined by
                      the Advisor to be of comparable quality; (ii) obligations
                      (certificates of deposit, time deposits, bank master
                      notes, and bankers' acceptances) of thrift institutions,
                      savings and loans, U.S. commercial banks (including
                      foreign branches of such banks), and U.S. and foreign
                      branches of foreign banks, provided that such institutions
                      (or, in the case of a branch, the parent institution) have
                      total assets of $1 billion or more as shown on their last
                      published financial statements at the time of investment;
                      (iii) short-term corporate obligations rated within the
                      three highest rating categories by a NRSRO (e.g., at least
                      A by S&P or A by Moody's) at the time of investment, or,
                      if not rated, determined by the Advisor to be of
                      comparable quality; (iv) general obligations issued by the
                      U.S. Government and backed by its full faith and credit,
                      and obligations issued or guaranteed as to principal and
                      interest by agencies or instrumentalities of the U.S.
                      Government (e.g., obligations issued by Farmers Home
                      Administration, Government National Mortgage Association,
                      Federal Farm Credit Bank and Federal Housing
                      Administration); (v) receipts, including TRs, TIGRs and
                      CATS; (vi) repurchase agreements involving such
                      obligations; (vii) loan participations issued by a bank in
                      the United States with assets exceeding $1 billion and for
                      which the underlying loan is issued by borrowers in whose
                      obligations the Fund may invest; (viii) money market funds
                      and (ix) foreign commercial paper.
 
                        Certain of the obligations in which a Fund may invest
                      may be variable or floating rate instruments, may involve
                      conditional or unconditional demand features and may
                      include variable amount master demand notes.
 
                        MORTGAGE-BACKED SECURITIES -- Securities generally
                      issued or guaranteed by U.S. government agencies such as
                      GNMA, FNMA, or FHLMC. GNMA mortgage-backed certificates
                      are mortgage-backed securities of the modified
                      pass-through type, which means that both interest and
                      principal payments (including prepayments) are passed
                      through monthly to the holder of the certificate. Each
                      GNMA certificate evidences an interest in a specific pool
                      of mortgage loans insured by the Federal Housing
                      Administration or the Farmers Home Administration or
                      guaranteed by the Veterans Administration. FNMA, a
                      federally-chartered and stockholder-owned corporation,
                      issues pass-through certificates which are guaranteed as
                      to payment of principal and interest by FNMA. FHLMC, a
                      corporate instrumentality of the United States, issues
                      participation certificates which represent an interest in
                      mortgages held in FHLMC's portfolio. FHLMC guarantees the
                      timely payment of interest and the ultimate collection of
 
                                       24
<PAGE>   213
 
                      principal. Securities issued or guaranteed by FNMA and
                      FHLMC are not backed by the full faith and credit of the
                      United States. There can be no assurance that the U.S.
                      government would provide financial support to FNMA or
                      FHLMC if necessary in the future.
 
                        Although payments on certain mortgage-related securities
                      may be guaranteed by a third party or otherwise similarly
                      secured, the market value of such securities is not
                      secured and may fluctuate significantly because of changes
                      in interest rates and changes in prepayment levels. Thus,
                      for example, if a Fund purchases a mortgage-related
                      security at a premium, that portion may be lost if there
                      is a decline in the market value of the security whether
                      due to changes in interest rates or prepayments of the
                      underlying mortgage collateral. As with other
                      interest-bearing securities, the prices of
                      mortgage-related securities are inversely affected by
                      changes in interest rates. However, although the value of
                      a mortgage-related security may decline when interest
                      rates rise, the converse is not necessarily true because
                      in periods of declining interest rates the mortgages
                      underlying the securities are prone to prepayment which
                      results in amounts being available for reinvestment which
                      are likely to be invested at a lower interest rate. For
                      this and other reasons, the stated maturity of a
                      mortgage-related security may be shortened by unscheduled
                      prepayments on the underlying mortgages and, accordingly,
                      it is not possible to predict accurately the security's
                      return to a Fund. In addition, regular payments received
                      on mortgage-related securities include both interest and
                      principal. No assurance can be given as to the return a
                      Fund will receive when these amounts are reinvested. As a
                      consequence, mortgage-related securities may be a less
                      effective means of "locking in" interest rates than other
                      types of debt securities having the same stated maturity,
                      may have less potential for capital appreciation and may
                      be considered riskier investments as a result.
 
                        Adjustable rate mortgage securities ("ARMS") are
                      pass-through certificates representing ownership interests
                      in a pool of adjustable rate mortgages and the resulting
                      cash flow from those mortgages. Unlike conventional debt
                      securities, which provide for periodic (usually
                      semi-annual) payments of interest and payments of
                      principal at maturity or on specified call dates, ARMs
                      provide for monthly payments based on a pro rata share of
                      both periodic interest and principal payments and
                      prepayments of principal on the underlying mortgage pool
                      (less GNMA's, FNMA's, or FHLMC's fees and any applicable
                      loan servicing fees).
 
                        Collateralized mortgage obligations ("CMOs") are bonds
                      generally issued by single purpose, stand-alone finance
                      subsidiaries or trusts established by financial
                      institutions, government agencies, investment banks, or
                      other similar institutions, and collateralized by pools of
                      mortgage loans. Payments of principal and interest on the
                      collateral mortgages are used to pay debt service on the
                      CMO. In a CMO,
 
                                       25
<PAGE>   214
 
                      a series of bonds or certificates is issued in multiple
                      classes. Each class of CMOs, often referred to as a
                      "tranche," is issued at a specific coupon rate and has a
                      stated maturity or final distribution date. The principal
                      and interest payment on the underlying mortgages may be
                      allocated among the classes of CMOs in several ways.
                      Typically, payments of principal, including any
                      prepayments, on the underlying mortgages would be applied
                      to the classes in the order of their respective stated
                      maturities or final distribution dates, so that no payment
                      of principal will be made on CMOs of a class until all
                      CMOs of other classes having earlier stated maturities or
                      final distribution dates have been paid in full.
 
                        One or more classes of CMOs may have coupon rates that
                      reset periodically based on an index, such as the London
                      Interbank Offered Rate ("LIBOR"). Each Fund may purchase
                      fixed, adjustable, or "floating" rate CMOs that are
                      collateralized by fixed rate or adjustable rate mortgages
                      that are guaranteed as to payment of principal and
                      interest by an agency or instrumentality of the U.S.
                      government or are directly guaranteed as to payment of
                      principal and interest by the issuer, which guarantee is
                      collateralized by U.S. government securities or is
                      collateralized by privately issued fixed rate or
                      adjustable rate mortgages.
 
                        Securities such as zero-coupon obligations,
                      mortgage-backed and asset-backed securities, and
                      collateralized mortgage obligations ("CMOs") will have
                      greater price volatility then other fixed-income
                      obligations. Because declining interest rates may lead to
                      prepayment of underlying mortgages, automobile sales
                      contracts or credit card receivables, the prices of
                      mortgage-related and asset-backed securities may not rise
                      with a decline in interest rates. Mortgage-backed and
                      asset-backed securities and CMOs are extremely sensitive
                      to the rate of principal prepayment. Similarly, callable
                      corporate bonds also present risk of prepayment. During
                      periods of falling interest rates, securities that can be
                      called or prepaid may decline in value relative to similar
                      securities that are not subject to call or prepayment.
 
                        Real Estate Mortgage Investment Conduits ("REMICs") are
                      private entities formed for the purpose of holding a fixed
                      pool of mortgages secured by an interest in real property.
                      REMICs are similar to CMOs in that they issue multiple
                      classes of securities.
 
                        OPTIONS -- Under a call option, the purchaser of the
                      option has the right to purchase, and the writer (the
                      Fund) the obligation to sell, the underlying security at
                      the exercise price during the option period. A put option
                      gives the purchaser the right to sell, and the writer the
                      obligation to purchase, the underlying security at the
                      exercise price during the option period.
 
                        In addition, certain Funds may buy options on stock
                      indices to invest cash on an interim basis. Such options
                      will be listed on a national securities exchange. In
 
                                       26
<PAGE>   215
 
                      order to close out an option position, a Fund may enter
                      into a "closing purchase transaction" -- the purchase of
                      an option on the same security with the same exercise
                      price and expiration date as the option contract
                      previously written on any particular security. When the
                      security is sold, a Fund effects a closing purchase
                      transaction so as to close out any existing option on that
                      security.
 
                        There are risks associated with such investments
                      including the following: (1) the success of a hedging
                      strategy may depend on the ability of the Advisor or
                      Sub-Advisor to predict movements in the prices of
                      individual securities, fluctuations in markets and
                      movements in interest rates; (2) there may be an imperfect
                      correlation between the movement in prices of securities
                      held by a Fund and the price of options; (3) there may not
                      be a liquid secondary market for options; and (4) while a
                      Fund will receive a premium when it writes covered call
                      options, it may not participate fully in a rise in the
                      market value of the underlying security.
 
                        RECEIPTS -- Interests in separately traded interest and
                      principal component parts of U.S. Treasury obligations
                      that are issued by banks and brokerage firms and are
                      created by depositing Treasury notes and Treasury bonds
                      into a special account at a custodian bank. The custodian
                      holds the interest and principal payments for the benefit
                      of the registered owners of the certificates of such
                      receipts. The custodian arranges for the issuance of the
                      certificates or receipts evidencing ownership and
                      maintains the register. Receipts include "Treasury
                      Receipts" ("TR's"), "Treasury Investment Growth Receipts"
                      ("TIGR's"), and "Certificates of Accrual on Treasury
                      Securities" ("CATS"). TR's, TIGR's and CATS are sold as
                      zero coupon securities, which means that they are sold at
                      a substantial discount and redeemed at face value at their
                      maturity date without interim cash payments of interest or
                      principal. This discount is accreted over the life of the
                      security, and such accretion will constitute the income
                      earned on the security for both accounting and tax
                      purposes. Because of these features, such securities may
                      be subject to greater interest rate volatility than
                      interest-paying securities. See also "FEDERAL TAXATION."
 
                        REPURCHASE AGREEMENTS -- Agreements whereby a Fund will
                      acquire securities from approved financial institutions or
                      registered broker-dealers that agree to repurchase the
                      securities at a mutually agreed-upon date and price. The
                      repurchase agreements entered into by the Funds will
                      provide that the underlying security at all times shall
                      have a value equal to 102% of the resale price stated in
                      the agreement. Repurchase agreements involving government
                      securities are not subject to a Fund's fundamental
                      investment limitation on purchasing securities of any one
                      issuer. If the seller defaults on its repurchase
                      obligation or becomes insolvent, the Fund holding such
                      obligations would suffer a loss to the extent that either
                      the proceeds from a sale of the underlying portfolio
                      securities were less than the repurchase price or the
                      Fund's disposition of the securities was delayed
 
                                       27
<PAGE>   216
 
                      pending court action. Securities subject to repurchase
                      agreements will be held by a qualified custodian or in the
                      Federal Reserve/Treasury book-entry system. Repurchase
                      agreements are considered to be loans by a Fund under the
                      Investment Company Act of 1940 (the "1940 Act").
 
                        REVERSE REPURCHASE AGREEMENTS -- A Fund may borrow funds
                      for temporary purposes by entering into reverse repurchase
                      agreements, provided such action is consistent with the
                      Fund's investment objective and fundamental investment
                      restrictions; as a matter of non-fundamental policy, each
                      Fund intends to limit such investments to no more than 10%
                      of the value of its total assets. Pursuant to a reverse
                      repurchase agreement, a Fund will sell portfolio
                      securities to financial institutions such as banks or to
                      broker-dealers, and agree to repurchase the securities at
                      a mutually agreed-upon date and price. A Fund intends to
                      enter into reverse repurchase agreements only to avoid
                      otherwise selling securities during unfavorable market
                      conditions to meet redemptions. At the time a Fund enters
                      into a reverse repurchase agreement, it will place in a
                      segregated custodial account assets such as U.S.
                      Government securities or other liquid, high-quality debt
                      securities consistent with the Fund's investment objective
                      having a value equal to 102% of the repurchase price
                      (including accrued interest), and will subsequently
                      monitor the account to ensure that an equivalent value is
                      maintained. Reverse repurchase agreements involve the risk
                      that the market value of the securities sold by a Fund may
                      decline below the price at which a Fund is obligated to
                      repurchase the securities. Reverse repurchase agreements
                      are considered to be borrowings by a Fund under the 1940
                      Act.
 
                        RULE 144A SECURITIES -- Rule 144A Securities are
                      securities that have not been registered under the
                      Securities Act of 1933, but which may be traded between
                      certain qualified institutional investors, including
                      investment companies. The absence of a secondary market
                      may affect the value of the Rule 144A Securities. The
                      Board of Trustees of HighMark has established guidelines
                      and procedures to be utilized to determine the liquidity
                      of such securities.
 
                        SECURITIES ISSUED ON A FORWARD COMMITMENT BASIS OR
                      WHEN-ISSUED SECURITIES -- Securities purchased for
                      delivery beyond the normal settlement date at a stated
                      price and yield and which thereby involve a risk that the
                      yield obtained in the transaction will be less than that
                      available in the market when delivery takes place. When a
                      Fund agrees to purchase when-issued securities or enter
                      into forward commitments, HighMark's custodian will be
                      instructed to set aside cash or liquid portfolio
                      securities equal to the amount of the commitment in a
                      segregated account. A Fund will generally not pay for such
                      securities and no income will accrue on the securities
                      until they are received. These securities are recorded as
                      an asset and are subject to changes in value based upon
                      changes in the general level of interest rates. Therefore,
                      the purchase of
 
                                       28
<PAGE>   217
 
                      securities on a "when-issued" basis or forward commitments
                      may increase the risk of fluctuations in a Fund's net
                      asset value.
 
                        SECURITIES LENDING -- During the time portfolio
                      securities are on loan from a Fund, the borrower will pay
                      the Fund any dividends or interest paid on the securities.
                      In addition, loans will be subject to termination by the
                      Fund or the borrower at any time and, while a Fund will
                      generally not have the right to vote securities on loan,
                      it will terminate the loan and regain the right to vote if
                      that is considered important with respect to the
                      investment. While the lending of securities may subject a
                      Fund to certain risks, such as delays or an inability to
                      regain the securities in the event the borrower were to
                      default on its lending agreement or enter into bankruptcy,
                      a Fund will receive 100% collateral in the form of cash or
                      U.S. Government securities. This collateral will be valued
                      daily by the lending agent, with oversight by the Advisor,
                      and, should the market value of the loaned securities
                      increase, the borrower will be required to furnish
                      additional collateral to the Fund.
 
                        SECURITIES SUBJECT TO A PUT FEATURE -- A "put" feature
                      permits a Fund to sell a fixed income security at a fixed
                      price prior to maturity. The underlying fixed income
                      securities subject to a put may be sold at any time at the
                      market rates. However, unless the put was an integral part
                      of the fixed income security as originally issued, it may
                      not be marketable or assignable. Generally, a premium is
                      paid for a put feature or a put feature is purchased
                      separately which results in a lower yield than would
                      otherwise be available for the same fixed income
                      securities.
 
                        STANDARD & POOR'S DEPOSITARY RECEIPTS (SPDRs) -- SPDRs
                      are interests in a unit investment trust holding a
                      portfolio of securities linked to the S&P 500 Index. SPDRs
                      closely track the underlying portfolio of securities,
                      trade like a share of common stock and pay periodic
                      dividends proportionate to those paid by the portfolio of
                      stocks that constitutes the S&P 500 Index. For further
                      information regarding SPDRs, see the Statement of
                      Additional Information.
 
                        TAX-EXEMPT COMMERCIAL PAPER -- Commercial paper, which
                      is commercial paper issued by governments and political
                      subdivisions.
 
                        TIME DEPOSITS -- Non-negotiable receipts issued by U.S.
                      or foreign banks in exchange for the deposit of funds.
                      Like certificates of deposit, they earn a specified rate
                      of interest over a definite period of time; however, they
                      cannot be traded in the secondary market. Time deposits
                      with a withdrawal penalty are considered to be illiquid
                      securities.
 
                        U.S. GOVERNMENT AGENCY SECURITIES -- Certain Federal
                      agencies have been established as instrumentalities of the
                      U.S. Government to supervise and finance certain types of
                      activities. Issues of these agencies, while not direct
 
                                       29
<PAGE>   218
 
                      obligations of the U.S. Government, are either backed by
                      the full faith and credit of the United States (e.g., GNMA
                      securities) or supported by the issuing agencies' right to
                      borrow from the U.S. Treasury. The issues of other
                      agencies are supported only by the credit of the
                      instrumentality (e.g., FNMA securities).
 
                        U.S. TREASURY OBLIGATIONS -- Bills, notes, and bonds
                      issued by the U.S. Treasury, as well as separately traded
                      interest and principal component parts of such obligations
                      known as Separately Traded Registered Interest and
                      Principal Securities ("STRIPS") that are transferable
                      through the Federal book-entry system.
 
                        U.S. Government Securities generally do not involve the
                      credit risks associated with investments in other types of
                      fixed-income securities, although, as a result, the yields
                      available from U.S. Government Securities are generally
                      lower than the yields available from otherwise comparable
                      corporate fixed-income securities. Like other fixed-income
                      securities, however, the values of U.S. Government
                      Securities change as interest rates fluctuate.
                      Fluctuations in the value of portfolio securities will in
                      many cases not affect interest income on existing
                      portfolio securities, but will be reflected in the Fund's
                      net asset value. Because the magnitude of these
                      fluctuations will generally be greater at times when a
                      Fund's average maturity is longer, under certain market
                      conditions the Fund may invest in short-term investments
                      yielding lower current income rather than investing in
                      higher yielding longer-term securities.
 
                        VARIABLE AND FLOATING RATE INSTRUMENTS -- Obligations
                      that may carry variable or floating rates of interest, may
                      involve conditional or unconditional demand features and
                      may include variable amount master demand notes. The
                      interest rates on these securities may be reset daily,
                      weekly, quarterly or some other reset period, and may have
                      a floor or ceiling on interest rate changes. There is a
                      risk that the current interest rate on such obligations
                      may not accurately reflect existing market interest rates.
                      A demand instrument with a demand notice period exceeding
                      seven days may be considered illiquid if there is no
                      secondary market for such security.
 
                        WARRANTS -- Securities that entitle the holder to buy a
                      proportionate amount of common stock at a specified price
                      for a limited or unlimited period of time. Warrants are
                      often freely transferable and are traded on major stock
                      exchanges.
 
                        YANKEE BONDS -- Dollar denominated securities issued by
                      foreign-domiciled issuers that obligate the issuer to pay
                      the bondholder a specified sum of money, usually
                      semiannually, and to repay the principal amount of the
                      loan at maturity. Sovereign bonds are bonds issued by the
                      governments of foreign countries. Supranational bonds are
                      those issued by supranational entities, such as
 
                                       30
<PAGE>   219
 
                      the World Bank and European Investment Bank. Canadian
                      bonds are bonds issued by Canadian provinces.
 
                        ZERO-COUPON OBLIGATIONS -- Non-income producing
                      securities evidencing ownership of future interest and
                      principal payments on bonds. These obligations pay no
                      current interest and are typically sold at prices greatly
                      discounted from par value. The return on a zero-coupon
                      obligation, when held to maturity, equals the difference
                      between the par value and the original purchase price.
 
                        For federal income tax purposes, the difference between
                      the par value and the original issue price (original issue
                      discount) is included in the income of a holder of a
                      zero-coupon obligation over the term of the obligation
                      even though the interest is not paid until maturity. The
                      amount included in income is determined under a constant
                      interest rate method. In addition, if an obligation is
                      purchased subsequent to its original issue, a holder such
                      as the Income Funds may elect to include market discount
                      in income currently on a ratable accrual method or a
                      constant interest rate method. Market discount is the
                      difference between the obligation's "adjusted issue price"
                      (the original issue price plus original issue discount
                      accrued to date) and the holder's purchase price. If no
                      such election is made, gain on the disposition of a market
                      discount obligation is treated as ordinary income (rather
                      than capital gain) to the extent it does not exceed the
                      accrued market discount.
 
                        Zero-coupon obligations have greater price volatility
                      than other fixed-income obligations of similar maturity
                      and such obligations will be purchased when the yield
                      spread, in light of the obligation's duration, is
                      considered advantageous.
 
                                       31
<PAGE>   220
 
                             HighMark BALANCED FUND
                            INVESTMENT PORTFOLIO OF
                                 HighMark FUNDS
                   For further information (including current
                  yield, purchase and redemption information),
                             call 1-(800) 433-6884
 
INVESTMENT ADVISOR
Pacific Alliance Capital Management,
a division of Union Bank of California, N.A.
475 Sansome Street
Post Office Box 45000
San Francisco, CA 94104
 
CUSTODIAN
Union Bank of California, N.A.
475 Sansome Street
Post Office Box 45000
San Francisco, CA 94104
 
ADMINISTRATOR & DISTRIBUTOR
SEI Fund Resources and
SEI Financial Services Company
Oaks, Pennsylvania 19456
 
LEGAL COUNSEL
Ropes & Gray
One Franklin Square
1301 K Street, N.W., Suite 800 East
Washington, D.C. 20005
 
AUDITORS
Deloitte & Touche LLP
1700 Courthouse Plaza Northeast
Dayton, OH 45402
 
  NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS IN CONNECTION WITH THE OFFERING
MADE BY THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY HIGHMARK OR
ITS DISTRIBUTOR. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY HIGHMARK OR
BY THE DISTRIBUTOR IN ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY
BE MADE.
 
NOT FDIC INSURED
<PAGE>   221
 
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                                 HIGHMARK FUNDS
 
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