UAM FUNDS INC
497, 1996-08-23
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<PAGE>
                                   UAM FUNDS
                            UAM FUNDS SERVICE CENTER
                    C/O CHASE GLOBAL FUNDS SERVICES COMPANY
                                 P.O. BOX 2798
                             BOSTON, MA 02208-2798
                                 1-800-638-7983
 
- --------------------------------------------------------------------------------
 
                        SIRACH CAPITAL MANAGEMENT, INC.
             SERVES AS INVESTMENT ADVISER TO THE SIRACH PORTFOLIOS
                           INSTITUTIONAL CLASS SHARES
- --------------------------------------------------------------------------------
 
   
  PROSPECTUS -- FEBRUARY 29, 1996, AS AMENDED JUNE 26, 1996 AND JULY 17, 1996
    
 
INVESTMENT OBJECTIVES
 
UAM  Funds,  Inc. (hereinafter  defined  as "UAM  Funds"  or the  "Fund")  is an
open-end, management investment company known  as a "mutual fund" and  organized
as a Maryland corporation. The Fund consists of multiple series of shares (known
as   "Portfolios")  each  of  which  has  different  investment  objectives  and
investment policies. The Sirach Strategic  Balanced, Growth, Special Equity  and
Equity  Portfolios currently offer two separate classes of shares: Institutional
Class Shares and  Institutional Service Class  Shares ("Service Class  Shares").
The  Sirach Fixed Income and Short-Term Reserves Portfolios currently offer only
one class of shares: Institutional Class Shares. The securities offered in  this
Prospectus are Institutional Class Shares of six diversified, no-load Portfolios
of the Fund managed by Sirach Capital Management, Inc.
 
SIRACH  STRATEGIC BALANCED  PORTFOLIO.   The objective  of the  Sirach Strategic
Balanced Portfolio is  to provide  long-term growth of  capital consistent  with
reasonable  risk to principal by investing  in a diversified portfolio of common
stocks and fixed income securities.
 
SIRACH GROWTH PORTFOLIO.   The objective  of the Sirach  Growth Portfolio is  to
provide long-term capital growth consistent with reasonable risk to principal by
investing  primarily in common  stocks of companies  that offer long-term growth
potential.
 
SIRACH FIXED  INCOME  PORTFOLIO.   The  objective  of the  Sirach  Fixed  Income
Portfolio  is  to provide  above-average total  return  with reasonable  risk to
principal by investing primarily in investment grade fixed income securities.
 
SIRACH SHORT-TERM RESERVES PORTFOLIO.   The objective  of the Sirach  Short-Term
Reserves Portfolio is to provide competitive rates of return consistent with the
maintenance  of  principal and  liquidity by  investing primarily  in investment
grade fixed income securities with an  average weighted maturity of three  years
or less.
 
SIRACH  SPECIAL EQUITY  PORTFOLIO.  The  objective of the  Sirach Special Equity
Portfolio is  to provide  maximum long-term  growth of  capital consistent  with
reasonable  risk  to  principal, by  investing  in small  to  medium capitalized
companies with particularly attractive financial characteristics.
 
   
SIRACH EQUITY PORTFOLIO.   The objective  of the Sirach  Equity Portfolio is  to
provide long-term capital growth consistent with reasonable risk to principal by
investing,  under normal circumstances, up to 90%  of its total assets in common
stocks of companies that offer long-term growth potential.
    
 
    There can be no assurance  that any of the  Portfolios will meet its  stated
objective.
 
ABOUT THIS PROSPECTUS
 
   
    This  Prospectus, which should be retained  for future reference, sets forth
concisely information that you  should know before you  invest. A "Statement  of
Additional  Information" containing  additional information  about the  Fund has
been filed with the Securities and Exchange Commission. Such Statement is  dated
February  29,  1996, as  amended June  26,  1996, and  has been  incorporated by
reference into this Prospectus. A copy of the Statement may be obtained, without
charge, by writing to the Fund or by calling the telephone number shown above.
    
 
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 OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
                        CONTRARY IS A CRIMINAL OFFENSE.
<PAGE>
                                 FUND EXPENSES
 
    The  following table illustrates expenses and fees that a shareholder of the
Sirach Portfolios Institutional  Class Shares will  incur. However,  transaction
fees  may be charged if you are a customer of a broker-dealer or other financial
intermediary who has established a  shareholder servicing relationship with  the
Fund  on behalf of their customers. Please  see "Purchase of Shares" for further
information.
 
                        SHAREHOLDER TRANSACTION EXPENSES
 
<TABLE>
<CAPTION>
                                       SIRACH         SIRACH                        SIRACH         SIRACH
                                      STRATEGIC        FIXED         SIRACH       SHORT-TERM       SPECIAL        SIRACH
                                      BALANCED        INCOME         GROWTH        RESERVES        EQUITY         EQUITY
                                      PORTFOLIO      PORTFOLIO      PORTFOLIO      PORTFOLIO      PORTFOLIO      PORTFOLIO
                                    INSTITUTIONAL  INSTITUTIONAL  INSTITUTIONAL  INSTITUTIONAL  INSTITUTIONAL  INSTITUTIONAL
                                    CLASS SHARES   CLASS SHARES   CLASS SHARES   CLASS SHARES   CLASS SHARES   CLASS SHARES
                                    -------------  -------------  -------------  -------------  -------------  -------------
<S>                                 <C>            <C>            <C>            <C>            <C>            <C>
Sales Load Imposed on Purchases...         NONE           NONE           NONE           NONE           NONE           NONE
Sales Load Imposed on Reinvested
 Dividends........................         NONE           NONE           NONE           NONE           NONE           NONE
Deferred Sales Load...............         NONE           NONE           NONE           NONE           NONE           NONE
Redemption Fees...................         NONE           NONE           NONE           NONE           NONE           NONE
Exchange Fees.....................         NONE           NONE           NONE           NONE           NONE           NONE
</TABLE>
 
                         ANNUAL FUND OPERATING EXPENSES
                    (AS A PERCENTAGE OF AVERAGE NET ASSETS)
 
   
<TABLE>
<CAPTION>
                                       SIRACH          SIRACH                          SIRACH          SIRACH
                                      STRATEGIC         FIXED          SIRACH        SHORT-TERM        SPECIAL         SIRACH
                                      BALANCED         INCOME          GROWTH         RESERVES         EQUITY          EQUITY
                                      PORTFOLIO       PORTFOLIO       PORTFOLIO       PORTFOLIO       PORTFOLIO       PORTFOLIO
                                    INSTITUTIONAL   INSTITUTIONAL   INSTITUTIONAL   INSTITUTIONAL   INSTITUTIONAL   INSTITUTIONAL
                                    CLASS SHARES    CLASS SHARES    CLASS SHARES    CLASS SHARES    CLASS SHARES    CLASS SHARES
                                    -------------   -------------   -------------   -------------   -------------   -------------
<S>                                 <C>             <C>             <C>             <C>             <C>             <C>
Investment Advisory Fees..........      .65%            .65%            .65%            .40%            .70%            .65%
Administrative Fees...............      .17%            .45%            .15%            .30%            .13%            .16%
12b-1 Fees........................      NONE            NONE            NONE            NONE            NONE            NONE
Other Expenses....................      .09%            .27%            .09%            .20%            .04%            .22%
Advisory Fees Waived..............       --            (.61)%            --            (.38)%            --            (.13)%
                                        ---             ---             ---             ---             ---           -----
Total Operating Expenses (After
 Fee Waiver):                           .91%*           .76%+*          .89%*           .52%+*          .87%*          0.90%
</TABLE>
    
 
- ------------------------------
+Absent the Adviser's  fee waiver,  annualized Total Operating  Expenses of  the
 Sirach  Fixed Income Portfolio  Institutional Class Shares  for the fiscal year
 ended October 31, 1995  would have been 1.37%,  and annualized Total  Operating
 Expenses of the Sirach Short-Term Reserves Portfolio Institutional Class Shares
 for the fiscal year ended October 31, 1995 would have been 0.87%.
   
*The annualized Total Operating Expenses excludes the effect of expense offsets.
 If  expense offsets were  included, annualized Total  Operating Expenses of the
 Sirach Strategic  Balanced,  Fixed  Income,  Growth,  and  Short-Term  Reserves
 Portfolios  Institutional Class Shares would be 0.90%, 0.75%, 0.87%, and 0.50%,
 respectively, and annualized  Total Operating  Expenses of  the Sirach  Special
 Equity Portfolio Institutional Class Shares would not differ significantly.
    
 
    The  Adviser has voluntarily agreed to waive  a portion of its advisory fees
and to assume as the Adviser's own expense operating expenses otherwise  payable
by  the Portfolios, if necessary,  in order to reduce  expense ratios. As of the
date of this  Prospectus, the Adviser  has agreed to  keep the annualized  Total
Operating  Expenses for Sirach Fixed Income,  the Sirach Short-Term Reserves and
the Sirach Equity  Portfolios Institutional Class  Shares from exceeding  0.75%,
0.50%  and 0.90% respectively,  of average daily  net assets. The  Fund will not
reimburse the  Adviser  for any  advisory  fees  that are  waived  or  Portfolio
expenses that the Adviser may bear on behalf of a Portfolio.
 
   
    The  purpose of the above  table is to assist  the investor in understanding
the various expenses that an investor of the Sirach Portfolios of the Fund  will
bear  directly or indirectly. With the exception of the Sirach Equity Portfolio,
the expenses and fees  for the Sirach  Portfolios set forth  above are based  on
operations  during  the fiscal  year  ended October  31,  1995 except  that such
information has  been  restated  to reflect  revised  administrative  fees.  The
expenses  and fees set forth above for  the Sirach Equity Portfolio are based on
estimates. For purposes of the calculating  the fees set forth above, the  table
assumes  that the  Sirach Equity  Portfolio's average  daily assets  will be $50
million. It  is estimated  that without  waiving fees  and assuming  reimbursing
expense the Total Operating Expenses would be 1.00% of the average net assets.
    
 
                                       2
<PAGE>
    The  following example illustrates the expenses that a shareholder would pay
on a $1,000 investment over various time  periods assuming (1) a 5% annual  rate
of  return and (2)  redemption at the end  of each time period.  As noted in the
table above, the Portfolios charge no redemption fees of any kind.
 
   
<TABLE>
<CAPTION>
                                          1 YEAR  3 YEARS  5 YEARS  10 YEARS
                                          ------  -------  -------  --------
<S>                                       <C>     <C>      <C>      <C>
Sirach Strategic Balanced Portfolio
 Institutional Class Shares.............    $ 9     $ 29     $ 51     $ 113
Sirach Fixed Income Portfolio
 Institutional Class Shares.............    $ 8     $ 24     $ 42     $  94
Sirach Growth Portfolio Institutional
 Class Shares...........................    $ 9     $ 28     $ 49     $ 110
Sirach Short-Term Reserves Portfolio
 Institutional Class Shares.............    $ 5     $ 17     $ 29     $  65
Sirach Special Equity Portfolio
 Institutional Class Shares.............    $ 9     $ 28     $ 49     $ 108
Sirach Equity Portfolio Institutional
 Class Shares...........................    $ 9     $ 29
</TABLE>
    
 
    THIS EXAMPLE SHOULD  NOT BE CONSIDERED  A REPRESENTATION OF  PAST OR  FUTURE
EXPENSES  OR PERFORMANCE.  ACTUAL EXPENSES MAY  BE GREATER OR  LESSER THAN THOSE
SHOWN.
 
                               PROSPECTUS SUMMARY
 
INVESTMENT OBJECTIVES AND POLICIES
 
    SIRACH STRATEGIC BALANCED PORTFOLIO.  The objective of the Sirach  Strategic
Balanced  Portfolio is  to provide long-term  growth of  capital consistent with
reasonable risk to principal by investing  in a diversified portfolio of  common
stocks and fixed income securities.
 
    SIRACH GROWTH PORTFOLIO.  The objective of the Sirach Growth Portfolio is to
provide long-term capital growth consistent with reasonable risk to principal by
investing  primarily in common  stocks of companies  that offer long-term growth
potential.
 
    SIRACH FIXED INCOME  PORTFOLIO.  The  objective of the  Sirach Fixed  Income
Portfolio  is  to provide  above-average total  return  with reasonable  risk to
principal by investing primarily in investment grade fixed income securities.
 
    SIRACH  SHORT-TERM  RESERVES  PORTFOLIO.    The  objective  of  the   Sirach
Short-Term  Reserves  Portfolio  is  to  provide  competitive  rates  of  return
consistent  with  the  maintenance  of  principal  and  liquidity  by  investing
primarily  in investment grade fixed income  securities with an average weighted
maturity of 3 years or less.
 
    SIRACH SPECIAL EQUITY PORTFOLIO.  The objective of the Sirach Special Equity
Portfolio is  to provide  maximum long-term  growth of  capital consistent  with
reasonable  risk  to  principal, by  investing  in small  to  medium capitalized
companies with particularly attractive financial characteristics.
 
   
    SIRACH EQUITY PORTFOLIO.  The objective of the Sirach Equity Portfolio is to
provide long-term capital growth consistent with reasonable risk to principal by
investing, under normal circumstances, up to  90% of its total assets in  common
stocks of companies that offer long-term growth potential.
    
 
INVESTMENT ADVISER
 
    Sirach  Capital Management,  Inc. (the "Adviser"),  an investment counseling
firm founded in 1970, serves as investment  adviser to six of the Fund's  Sirach
Portfolios.  The  Adviser  presently manages  over  $5.4 billion  in  assets for
institutional  clients  and  high   net  worth  individuals.  (See   "Investment
Adviser.")
 
PURCHASE OF SHARES
 
    Shares  of each Portfolio  are offered, through  UAM Fund Distributors, Inc.
(the "Distributor"), to investors at net asset value without a sales commission.
Share purchases may  be made by  sending investments directly  to the Fund.  The
minimum  initial investment is $2,500. The minimum for subsequent investments is
$100.  The  minimum  initial  investment  for  401(k)  plans  is  $500.  Certain
exceptions  to the  initial or  minimum investment  amounts may  be made  by the
officers of the Fund. (See "Purchase of Shares.")
 
DIVIDENDS AND DISTRIBUTIONS
 
    Each Portfolio  will  normally  distribute  substantially  all  of  its  net
investment  income  in  the  form  of  quarterly  dividends.  In  addition, each
Portfolio  will   distribute  any   unrealized  net   capital  gains   annually.
Distributions  will be  reinvested in  Portfolio shares  automatically unless an
investor elects to  receive cash distributions.  (See "Dividends, Capital  Gains
Distributions and Taxes.")
 
                                       3
<PAGE>
REDEMPTIONS AND EXCHANGES
 
    Shares  of each Portfolio may be redeemed  at any time, without cost, at the
net asset value of the Portfolio next determined after receipt of the redemption
request. The redemption price may be more or less than the purchase price.  (See
"Redemption of Shares.")
 
ADMINISTRATIVE SERVICES
 
    UAM  Fund Services Inc.,  a wholly-owned subsidiary  of UAM Asset Management
Corporation, is responsible for  performing and overseeing administration,  fund
accounting,  dividend disbursing  and transfer  agency services  provided to the
Fund and its Portfolios by  third-party service providers. (See  "Administrative
Services.")
 
RISK FACTORS
 
    The  value of each Portfolio's shares  will fluctuate in response to changes
in market  and economic  conditions, as  well as  the financial  conditions  and
prospects  of the  issuers in which  a Portfolio  invests. Prospective investors
should consider the following factors. (1) The Sirach Fixed Income and  Balanced
Portfolios may invest a portion of their assets in derivatives including futures
contracts  and options.  (See "Futures Contracts  and Options.")  (2) The Sirach
Special Equity Portfolio  invests primarily in  small and medium  capitalization
companies,  some of which  may be foreign based.  (See "Investment Policies" and
"Foreign Investments.")  (3)  In general,  the  Portfolios will  not  trade  for
short-term  profits,  but when  circumstances warrant,  investments may  be sold
without regard to the length of time held. High rates of portfolio turnover  may
result  in additional  transaction costs and  the realization  of capital gains.
(See "Portfolio  Turnover.") (4)  In addition,  each Portfolio  may use  various
investment practices that involve special considerations, including investing in
repurchase  agreements,  when issued,  forward  delivery and  delayed settlement
securities and lending of securities. (See "Other Investment Policies.")
 
                                       4
<PAGE>
                              FINANCIAL HIGHLIGHTS
                           INSTITUTIONAL CLASS SHARES
 
    The following tables provide selected per share data and ratios for a  share
outstanding  throughout each of  the respective periods  presented of the Sirach
Special Equity, Strategic Balanced, Growth, Fixed Income and Short-Term Reserves
Portfolios' Institutional Class Shares and are part of the Portfolios' Financial
Statement included in the Portfolios'  1995 Annual Report to Shareholders  which
is  incorporated  by  reference  into the  Portfolios'  Statement  of Additional
Information. The Portfolios'  Financial Statements have  been examined by  Price
Waterhouse LLP whose opinion thereon (which is unqualified) is also incorporated
by  reference  into  the  Statement  of  Additional  Information.  The following
information should  be read  in  conjunction with  the Portfolio's  1995  Annual
Report to Shareholders.
 
<TABLE>
<CAPTION>
                                                          SIRACH SPECIAL EQUITY PORTFOLIO
                                -----------------------------------------------------------------------------------
 <S>                            <C>           <C>        <C>         <C>         <C>         <C>         <C>
                                OCTOBER 2,**
                                  1989 TO                            YEARS ENDED OCTOBER 31,
                                OCTOBER 31,   ---------------------------------------------------------------------
                                    1989        1990        1991        1992        1993        1994        1995
                                ------------  ---------  ----------  ----------  ----------  ----------  ----------
 Net Asset Value, Beginning of
  Period.......................   $ 10.00     $  9.67    $   8.58    $  13.90    $  15.03    $  19.10    $  16.10
 Income From Investment
  Operations
 Net Investment Income (Loss)..      0.02        0.15        0.07        0.05       (0.01)       0.04        0.11
 Net Realized & Unrealized Gain
  (Loss) on Investments........     (0.35)      (1.08)       5.33        1.13        4.68       (0.90)       3.65
 Total From Investment
  Operations...................     (0.33)      (0.93)       5.40        1.18        4.67       (0.86)       3.76
 Distributions:
 Net Investment Income.........        --       (0.16)      (0.08)      (0.05)      (0.01)      (0.02)      (0.11)
 Net Realized Gain on
  Investments..................        --          --          --          --       (0.59)      (2.12)      (0.95)
 Total Distributions...........        --       (0.16)      (0.08)      (0.05)      (0.60)      (2.14)      (1.06)
 Net Asset Value, End of
  Period.......................   $  9.67     $  8.58    $  13.90    $  15.03    $  19.10    $  16.10    $  18.80
 Total Return..................     (3.30)%     (9.78)%     63.13%       8.50%      31.81%      (4.68)%     25.31%
 Ratios and Supplemental Data
 Net Assets, End of Period
  (Thousands)..................   $25,679     $73,098    $255,118    $358,714    $528,078    $513,468    $498,026
 Ratio of Expenses to Average
  Net Assets...................      1.90%*      0.98%       0.92%       0.90%       0.89%       0.88%       0.85%#
 Ratio of Net Investment Income
  (Loss) to Average Net
  Assets.......................      2.64%*      1.71%       0.61%       0.38%      (0.03)%      0.27%       0.64%
 Portfolio Turnover Rate.......         7%        108%         85%        122%        102%        107%        137%
</TABLE>
 
- ------------------------------
 *Annualized.
**Commencement of Operations.
#For  the year  ended October  31, 1995,  the Ratio  of Expenses  to Average Net
 Assets excludes  the  effect  of  expense  offsets.  If  expense  offsets  were
 included,  the Ratio of Expenses to  Average Net Assets would not significantly
 differ.
 
                                       5
<PAGE>
 
<TABLE>
<CAPTION>
                                                                               SIRACH STRATEGIC BALANCED
                                                                                       PORTFOLIO
                                              SIRACH GROWTH PORTFOLIO       -------------------------------
                                          --------------------------------                       YEAR ENDED
                                          DECEMBER 1, 1993**   YEAR ENDED   DECEMBER 1, 1993**    OCTOBER
                                                  TO           OCTOBER 31,          TO              31,
                                           OCTOBER 31, 1994       1995       OCTOBER 31, 1994       1995
                                          -------------------  -----------  -------------------  ----------
 <S>                                      <C>                  <C>          <C>                  <C>
 Net Asset Value, Beginning of Period....      $ 10.00         $   9.66          $ 10.00         $   9.35
 Income From Investment Operations
 Net Investment Income...................         0.10             0.15             0.27             0.36
 Net Realized and Unrealized Gain (Loss)
  on Investments.........................        (0.36)            1.70            (0.69)            1.39
 Total From Investment Operations........        (0.26)            1.85            (0.42)            1.75
 Distributions
 Net Investment Income...................        (0.08)           (0.16)           (0.23)           (0.35)
 Net Asset Value, End of Period..........      $  9.66         $  11.35          $  9.35         $  10.75
 Total Return............................        (2.58)%          19.33%           (4.19)%          19.10%
 Ratios and Supplemental Data
 Net Assets, End of Period (Thousands)...      $80,944         $114,787          $99,564         $ 95,834
 Ratio of Expenses to Average Net
  Assets.................................         0.92%*           0.86%#           0.90%*           0.87%#
 Ratio of Net Investment Income to
  Average Net Assets.....................         1.13%*           1.48%            3.05%*           3.49%
 Portfolio Turnover Rate.................          141%             119%             158%             158%
</TABLE>
 
- ------------------------------
 *Annualized.
**Commencement of Operations.
#For the year  ended October  31, 1995,  the Ratio  of Expenses  to Average  Net
 Assets  excludes  the  effect  of  expense  offsets.  If  expense  offsets were
 included, the Ratio of Expenses to Average Net Assets would be 0.84% and 0.86%,
 respectively, for the  Sirach Growth  Portfolio and  Sirach Strategic  Balanced
 Portfolio.
 
<TABLE>
<CAPTION>
                                                                              SIRACH SHORT-TERM RESERVED
                                                                                       PORTFOLIO
                                           SIRACH FIXED INCOME PORTFOLIO    -------------------------------
                                          --------------------------------                       YEAR ENDED
                                          DECEMBER 1, 1993**   YEAR ENDED   DECEMBER 1, 1993**    OCTOBER
                                                  TO           OCTOBER 31,          TO              31,
                                           OCTOBER 31, 1994       1995       OCTOBER 31, 1994       1995
                                          -------------------  -----------  -------------------  ----------
 <S>                                      <C>                  <C>          <C>                  <C>
 Net Asset Value, Beginning of Period....      $ 10.00         $   9.16          $ 10.00         $  10.03
 Income From Investment Operations
 Net Investment Income+..................         0.48             0.58             0.34             0.59
 Net Realized and Unrealized Gain (Loss)
  on Investments.........................        (0.91)            0.73            (0.02)           (0.02)
 Total From Investment Operations........        (0.43)            1.31             0.32             0.57
 Distributions
 Net Investment Income...................        (0.41)           (0.59)           (0.29)           (0.58)
 Net Asset Value, End of Period..........      $  9.16         $   9.88          $ 10.03         $  10.02
 Total Return............................        (4.33)%++        14.75%++          3.24%++          5.83%++
 Ratios and Supplemental Data
 Net Assets, End of Period (Thousands)...      $12,178         $ 15,439          $21,371         $ 18,489
 Ratio of Expenses to Average Net
  Assets+................................         0.75%*           0.76%#           0.50%*           0.52%#
 Ratio of Net Investment Income to
  Average Net Assets+....................         5.37%*           6.13%            3.53%*           5.34%
 Portfolio Turnover Rate.................          230%             165%              13%              38%
</TABLE>
 
- ------------------------------
 *Annualized.
**Commencement of Operations.
 +Net of voluntarily waived fees and expenses assumed by the Adviser of $.08 and
  $.06,  respectively  for  Sirach Fixed  Income  Portfolio and  $.04  and $.04,
  respectively for Sirach  Short-Term Reserves Portfolio,  for the period  ended
  October 31, 1994 and the year ended October 31, 1995.
++Total  return  would have  been lower  had  certain fees  not been  waived and
  expenses assumed by the Adviser during the periods indicated.
 #For the year  ended October 31,  1995, the  Ratio of Expenses  to Average  Net
  Assets  excludes  the  effect  of expense  offsets.  If  expense  offsets were
  included, the  Ratio of  Expenses to  Average Net  Assets would  be 0.75%  and
  0.50%,  respectively, for Sirach Fixed  Income Portfolio and Sirach Short-Term
  Reserves Portfolio.
 
                            PERFORMANCE CALCULATIONS
 
    Each Portfolio may advertise or quote  total return data. Total return  will
be  calculated  on  an  average  annual total  return  basis,  and  may  also be
calculated on  an aggregate  total return  basis, for  various periods.  Average
annual total return reflects the average annual percentage change in value of an
investment  in the  Portfolio over  a measuring  period. Aggregate  total return
reflects the total  percentage change  in value  over a  measuring period.  Both
methods  of calculating  total return  assume that  dividends and  capital gains
distributions made by a Portfolio during the period are reinvested in  Portfolio
shares.
 
                                       6
<PAGE>
    Performance  will  be  calculated  separately  for  Institutional  Class and
Service  Class  Shares.  Dividends   paid  by  a   Portfolio  with  respect   to
Institutional  Class and Service  Class Shares, to the  extent any dividends are
paid, will be calculated in the same manner at the same time on the same day and
will be in the same amount, except that services fees, distribution charges  and
any  incremental transfer agency costs relating  to Service Class Shares will be
borne exclusively by that class.
 
    The Annual Report to the shareholders of the Sirach Portfolios for the  most
recent fiscal year end contains additional performance information that includes
comparisons  with appropriate  indices. The  Annual Report  is available without
charge upon request to the Fund by  writing to the address or calling the  phone
number on the cover of this Prospectus.
 
                             INVESTMENT OBJECTIVES
 
    SIRACH  STRATEGIC BALANCED PORTFOLIO.  The objective of the Sirach Strategic
Balanced Portfolio  is  to  provide long-term  capital  growth  consistent  with
reasonable  risk to principal by investing  in a diversified portfolio of common
stocks of established  companies and investment  grade fixed income  securities.
The  proportion of  the Portfolio's  assets invested  in fixed  income or common
stocks will  vary as  market conditions  warrant. A  typical asset  mix for  the
Portfolio,  however, is expected  to be 50%  common stocks and  50% fixed income
securities.  Cash  equivalent  investments   will  be  maintained  when   deemed
appropriate by the Adviser.
 
    SIRACH GROWTH PORTFOLIO.  The objective of the Sirach Growth Portfolio is to
provide long-term capital growth consistent with reasonable risk to principal by
investing in common stocks of companies that offer long-term growth potential.
 
    SIRACH  FIXED INCOME  PORTFOLIO.  The  objective of the  Sirach Fixed Income
Portfolio is to  provide above-average total  return consistent with  reasonable
risk  to  principal  by investing  primarily  in investment  grade  fixed income
securities of  varying  maturities of  the  U.S. Government  and  its  agencies,
corporate  bonds, collateralized mortgage  obligations ("CMOs"), mortgage-backed
securities, and  various  short  term  instruments  such  as  commercial  paper,
Treasury  bills and certificates of  deposit. Income return is  expected to be a
predominant portion of the Portfolio's total  return. Any capital return on  the
Portfolio is dependent upon interest rate movements. The capital return from the
Portfolio will vary according to, among other factors, interest rate changes and
the average maturity (duration) of the Portfolio.
 
    SIRACH   SHORT-TERM  RESERVES  PORTFOLIO.    The  objective  of  the  Sirach
Short-Term  Reserves  Portfolio  is  to  provide  competitive  rates  of  return
consistent  with  the  maintenance  of  principal  and  liquidity  by  investing
primarily in investment grade fixed  income securities with an average  weighted
maturity of 3 years or less.
 
    SIRACH SPECIAL EQUITY PORTFOLIO.  The objective of the Sirach Special Equity
Portfolio  is to  provide maximum  long-term growth  of capital  consistent with
reasonable risk to principal, by investing in small to medium capitalized growth
companies that have particularly strong financial characteristics as measured by
the Adviser's "ranking system."
 
   
    SIRACH EQUITY PORTFOLIO.  The objective of the Sirach Equity Portfolio is to
provide long-term capital growth consistent with reasonable risk to principal by
investing, under normal circumstances, up to  90% of its total assets in  common
stocks  of companies that offer long-term  growth potential. As described below,
growth potential is measured by the Adviser's "ranking" system.
    
 
    There can be no assurance that any of the Portfolios will achieve its stated
objective.
 
                              INVESTMENT POLICIES
 
    SIRACH  STRATEGIC  BALANCED  PORTFOLIO.    The  Sirach  Strategic   Balanced
Portfolio  is designed to provide a single  vehicle with which to participate in
the Adviser's equity and  fixed income strategies,  combined with the  Adviser's
asset  allocation decisions.  The Portfolio  seeks to  achieve its  objective by
investing in a combination of stocks,  bonds and short-term cash equivalents.  A
typical  asset mix of the Portfolio is expected to be 50% equities and 50% fixed
income securities. However, depending upon market conditions, the mix may  vary,
and  cash equivalent investments  will be maintained  when deemed appropriate by
the Adviser. Under  normal conditions,  the range  of exposure  to fixed  income
securities  is expected  to be  25% to 50%  of the  Portfolio, and  the range of
exposure to equity securities is  expected to be 35%  to 70%. However, at  least
25%  of the  Portfolio's total  assets will always  be invested  in fixed income
senior securities including debt securities and preferred stock.
 
                                       7
<PAGE>
    Equity and fixed income securities  are selected using approaches  identical
to  those for the Sirach Growth Portfolio  and the Sirach Fixed Income Portfolio
as set forth below.
 
    SIRACH GROWTH PORTFOLIO.  The Sirach  Growth Portfolio seeks to achieve  its
objective  by investing in common stocks of companies that are small, medium and
large  growth  companies  deemed  by  the  Adviser  to  offer  long-term  growth
potential.  The securities  selected will  be from  a universe  of approximately
2,500 companies listed on the New York  and American Stock Exchanges and on  the
National   Association  of   Securities  Dealers   Automated  Quotations  system
("NASDAQ"). The Portfolio may  also invest in  convertible bonds or  convertible
preferred stocks.
 
    The  Adviser's security  selection process for  the Portfolio  will focus on
those companies that rank high on the Adviser's proprietary ranking system.  The
ranking  system  consists of  five  buying tests  that  are ranked  according to
decile. The  Adviser believes  that  companies that  possess a  higher  "ranking
score" are likely to provide superior rates of return over an extended period of
time  relative to  the stock  market in general.  The components  of the ranking
system include  past earnings  per share  growth rates,  earnings  acceleration,
prospective earnings "surprise" probabilities, relative price strength, and cash
reinvestment  rates.  The  Adviser  screens a  universe  of  approximately 2,500
companies to identify potentially attractive  securities. The list of  potential
investments  is narrowed further by the  use of traditional fundamental security
analysis. The  Adviser focuses  particular attention  on those  companies  whose
recent earnings have exceeded consensus expectations.
 
   
    As  perceived risks in  the marketplace increase, cash  reserves can be used
for defensive purposes. Under normal circumstances, it is anticipated that  cash
reserves  will represent a relatively small percentage of the Portfolio's assets
(less than 20%). For temporary defensive purposes, the Portfolio may reduce  its
holdings   of  equity  securities  and   increase  its  holdings  in  short-term
investments. (See "Other Investment Policies - Short-Term Investments.")
    
 
    The Adviser  anticipates  that  the  majority  of  the  investments  in  the
Portfolio  will be in United States based companies. However, from time to time,
shares of foreign based companies may  be purchased, if they pass the  selection
process  outlined above.  The Portfolio may  invest up  to 20% of  its assets in
shares of foreign based companies. In  addition, if shares of a foreign  company
are  purchased, they must be  traded in the United  States as sponsored American
Depositary Receipts  ("ADRs") which  are U.S.  domestic securities  representing
ownership  rights in  foreign companies. (See  "Foreign Investments"  for a more
detailed description of the risks involved.)
 
    SIRACH FIXED INCOME PORTFOLIO.  The  Sirach Fixed Income Portfolio seeks  to
achieve  its objective  by investing  in a  diversified mix  of investment grade
fixed income securities of varying  maturities including securities of the  U.S.
Government  and  its  agencies,  corporate  bonds,  mortgage-backed  securities,
asset-backed securities, and various short  term instruments such as  commercial
paper, Treasury bills and certificates of deposit.
 
    Investment grade bonds are generally considered to be those bonds having one
of  the  four  highest  grades  assigned  by  Moody's  Investors  Services, Inc.
("Moody's") (Aaa, Aa,  A or  Baa ) or  Standard and  Poor's Corporation  ("S&P")
(AAA,  AA, A or BBB). Securities rated Baa  by Moody's or BBB by S&P may possess
speculative characteristics and may be more sensitive to changes in the  economy
and  the financial condition of issuers than higher rated bonds. Mortgage-backed
securities in which the Portfolio may invest will either carry a guarantee  from
an  agency of the U.S.  Government or a private issuer  of the timely payment of
principal and interest  or are  sufficiently seasoned  to be  considered by  the
Adviser to be of investment grade quality.
 
    It  is  the Adviser's  intention that  the  Portfolio's investments  will be
limited to the investment grades described above. However, the Adviser  reserves
the right to retain securities which are downgraded by one or both of the rating
agencies  if, in  the Adviser's  judgement, the  retention of  the securities is
warranted.  In  addition,  the  Adviser  may  invest  in  preferred  stocks  and
convertible  securities. In the  case of convertible  securities, the conversion
privilege may be exercised, but the common stocks received will be sold.
 
    Credit quality of bonds in such  ratings categories can change suddenly  and
unexpectedly,  and even recently-issued credit ratings may not fully reflect the
actual risks  posed by  a particular  security.  For these  reasons, it  is  the
Portfolio's policy not to rely primarily on ratings issued by established credit
rating  agencies, but to utilize such  ratings in conjunction with the Adviser's
own independent and on-going review of credit quality.
 
    The Adviser expects to  actively manage the Portfolio  in order to meet  its
investment  objective. The  Adviser attempts  to be  risk averse  believing that
preserving principal  in  periods  of  rising  interest  rates  should  lead  to
above-average  returns over the long run. The structure of the Portfolio will be
largely determined by  the Adviser's assessment  of current economic  conditions
and    trends,   the   Federal   Reserve    Board's   management   of   monetary
 
                                       8
<PAGE>
policy, fiscal  policy, inflation  expectations, government  and private  credit
demands  and global conditions. Once these factors have been carefully analyzed,
the average maturity/duration of the Portfolio  will be adjusted to reflect  the
Adviser's outlook. Under normal market conditions, the weighted average maturity
and  duration will range between eight and  twelve years and four and six years,
respectively. Over a complete  market cycle, the  average maturity and  duration
will, on average, equal the general market.
 
    Additionally,  the  Adviser  attempts to  emphasize  relative  values within
selected maturity  ranges.  Interest  rate  spreads  between  different  quality
ranges,  by  types of  issues and  within  coupon areas  are monitored,  and the
Portfolio will be structured to take  advantage of relative values within  these
areas.  Marketability  of  individual  issues  and  diversification  within  the
Portfolio will be emphasized. The Portfolio will hold, under most circumstances,
no more than 10% of its assets in any non-governmental issue.
 
    While the  Adviser  anticipates that  the  majority  of the  assets  in  the
Portfolio  will  be  U.S.  dollar-denominated  securities,  up  to  20%  of  the
Portfolio's assets may consist of obligations of foreign governments,  agencies,
or  corporations denominated either  in U.S. dollars  or foreign currencies. The
credit quality standards applied  to foreign obligations are  the same as  those
applied to the selection of U.S.-based securities.
 
    The Portfolio may enter into futures contracts and options on such contracts
for  hedging purposes. (See "Futures Contracts  and Options" for a more complete
discussion of this policy and a description of special considerations and  risks
associated with investing in futures and options.)
 
    SIRACH  SHORT-TERM RESERVES PORTFOLIO.   The Portfolio  seeks to achieve its
objective by investing exclusively in the following short-term investment  grade
fixed income securities with an average weighted maturity of 3 years or less:
 
    (1) Short-term  corporate debt securities rated BBB  or better by S&P or Baa
        or better by Moody's;
 
    (2) U.S. Treasury and U.S. Government agency obligations;
 
    (3) Bank  obligations,  including  certificates  of  deposit  and   banker's
        acceptances;
 
    (4) Commercial paper rated Prime-1 by Moody's or A-1 by S&P; and
 
    (5) Repurchase agreements collateralized by these securities.
 
    SIRACH  SPECIAL  EQUITY  PORTFOLIO.   The  Portfolio  seeks  to  achieve its
objective by investing primarily in the  common stocks of companies with  market
capitalizations  of $100 million to $2  billion dollars. Securities selected for
the Portfolio will be chosen from the New York Stock Exchange and American Stock
Exchange or  from  the  over  the  counter  markets  operated  by  the  National
Association of Securities Dealers.
 
    The  security selection process for the Portfolio focuses on those companies
within the market capitalization specified above and that rank above average  on
the  Adviser's proprietary  "ranking system."  The "ranking  system" consists of
five buying tests that are ranked according to decile. The Adviser believes that
companies with smaller capitalizations that possess a higher "ranking score" are
likely to  provide superior  rates of  return over  an extended  period of  time
relative  to the stock market  in general. The components  of the ranking system
include past earnings per share growth rates, earnings acceleration, prospective
earnings  "surprise"   probabilities,   relative  price   strength,   and   cash
reinvestment  rates. The Adviser screens a  universe of several thousand smaller
to medium capitalized companies  to identify potentially attractive  securities.
The  list of potential investments is narrowed further by the use of traditional
fundamental security  analysis.  In  addition, the  Adviser  focuses  particular
attention  on those  companies whose  earnings momentum  are accelerating and/or
whose recent earnings have exceeded the Adviser's expectations.
 
    It is  anticipated that  cash  reserves will  represent a  relatively  small
percentage of the Portfolio's assets (less than 20% under normal circumstances.)
For temporary defensive purposes, however, the Portfolio may reduce its holdings
of  equity  securities and  increase,  up to  100%,  its holdings  in short-term
investments.
 
    The Adviser  anticipates  that  the  majority  of  the  investments  in  the
Portfolio  will be in United States based companies. However, from time to time,
shares of foreign based  companies may be purchased  if they pass the  selection
process  outlined  above.  In  addition,  if shares  of  a  foreign  company are
purchased, they  must be  traded in  the United  States as  American  Depositary
Receipts  ("ADRs"), which  are U.S.  domestic securities  representing ownership
rights in foreign companies. Under normal circumstances, ADRs will not  comprise
more  than 20% of the Portfolio's assets.  (See "Foreign Investments" for a more
detailed description of the risks involved.)
 
                                       9
<PAGE>
    SIRACH EQUITY PORTFOLIO.   The Portfolio seeks to  achieve its objective  by
investing  primarily in  common stocks of  companies that are  small, medium and
large capitalization growth companies deemed  by the Adviser to offer  long-term
potential.
 
    The  security  selection  process  for the  Portfolio  will  focus  on those
companies that  rank  high on  the  Adviser's proprietary  ranking  system.  The
ranking  system  consists of  five  buying tests  that  are ranked  according to
decile. The  Adviser believes  that  companies that  possess a  higher  "ranking
score" are likely to provide superior rates of return over an extended period of
time  relative to  the stock  market in general.  The components  of the ranking
system include  past earnings  per share  growth rates,  earnings  acceleration,
prospective  earnings "surprise" probabilities, relative price strength and cash
reinvestment rates.  The  Adviser  screens a  universe  of  approximately  2,500
companies  to identify potentially attractive  securities. The list of potential
investments is narrowed further by  the use of traditional fundamental  security
analysis.  The  Adviser focuses  particular attention  on those  companies whose
recent earnings have exceeded consensus expectations.
 
    In seeking to fulfill its investment objective, the Portfolio, under  normal
circumstances,  will invest  at least  90% of  its assets  in equity securities,
consisting primarily of common stock; however, the Portfolio may also invest  in
convertible  bonds or convertible  preferred stocks. The  Portfolio may invest a
portion of its  assets in  shares of  foreign based  companies. If  shares of  a
foreign  company are  purchased, they  must be  traded in  the United  States as
sponsored American Depositary Receipts ("ADRs"). (See "Foreign Investments"  for
a more detailed description of the risks involved.)
 
                           OTHER INVESTMENT POLICIES
 
SHORT-TERM INVESTMENTS
 
    There  may be periods when  economic or market conditions  are such that the
Adviser deems  a temporary  defensive position  to be  appropriate. During  such
periods, each Portfolio may adopt a temporary defensive posture in which greater
than  35% of its net assets are invested in the following instruments consistent
with each Portfolio's investment policies as set forth above.
 
    (1) Time deposits, certificates  of deposit  (including marketable  variable
        rate  certificates  of deposit)  and  bankers' acceptances  issued  by a
        commercial bank  or  savings and  loan  association. Time  deposits  are
        non-negotiable  deposits  maintained  in  a  banking  institution  for a
        specified period  of  time at  a  stated interest  rate.  Time  deposits
        maturing  in more than seven days will  not be purchased by a Portfolio,
        and time deposits maturing from two business days through seven calendar
        days will not exceed 10% of the total assets of a Portfolio.
 
        Certificates of deposit are negotiable short-term obligations issued  by
        commercial  banks  or savings  and  loan associations  collateralized by
        funds deposited in the  issuing institution. Variable rate  certificates
        of  deposit are  certificates of deposit  on which the  interest rate is
        periodically adjusted  prior  to  their stated  maturity  based  upon  a
        specified  market rate. A banker's acceptance is a time draft drawn on a
        commercial  bank  by   a  borrower,  usually   in  connection  with   an
        international  commercial  transaction (to  finance the  import, export,
        transfer or storage of goods).
 
        Each Portfolio will not  invest in any security  issued by a  commercial
        bank unless (i) the bank has total assets of at least $1 billion, or the
        equivalent  in other currencies, (ii) in the case of U.S. banks, it is a
        member of the Federal  Deposit Insurance Corporation,  and (iii) in  the
        case  of foreign branches of U.S. banks, the security is, in the opinion
        of the  Adviser, of  an investment  quality comparable  with other  debt
        securities which may be purchased by each Portfolio;
 
    (2) Commercial  paper  rated A-1  or A-2  by  S&P or  Prime-1 or  Prime-2 by
        Moody's or, if not rated, issued by a corporation having an  outstanding
        unsecured debt issue rated A or better by Moody's or by S&P;
 
    (3) Short-term  corporate obligations rated  BBB or better by  S&P or Baa or
        better by Moody's;
 
    (4) U.S. Government obligations including bills, notes, bonds and other debt
        securities issued by the U.S. Treasury. These are direct obligations  of
        the  U.S. Treasury, supported by the full faith and credit pledge of the
        U.S. Government  and differ  mainly in  interest rates,  maturities  and
        dates of issue;
 
    (5) U.S.   Government  agency  securities  issued   or  guaranteed  by  U.S.
        Government sponsored instrumentalities and Federal agencies.  Generally,
        such  securities are evaluated on  the creditworthiness of their issuing
        agency or guarantor  and are  not backed by  the direct  full faith  and
        credit pledge of the U.S. Government. These include securities issued by
        the Federal Home Loan Banks, Federal Land Bank,
 
                                       10
<PAGE>
        Farmers   Home  Administration,  Federal   Farm  Credit  Banks,  Federal
        Intermediate Credit Bank, Federal National Mortgage Association, Federal
        Financing Bank, the Tennessee Valley Authority, and others; and
 
    (6) Repurchase agreements collateralized by securities listed above.
 
    The Fund has received permission from the Securities and Exchange Commission
(the "Commission") to deposit the daily  uninvested cash balances of the  Fund's
Portfolios,  as well  as cash  for investment purposes,  into one  or more joint
accounts and to invest the daily balance of the joint accounts in the  following
short-term    investments:    fully   collateralized    repurchase   agreements,
interest-bearing or  discounted  commercial paper  including  dollar-denominated
commercial  paper  of foreign  issuers, and  any  other short-term  money market
instruments including  variable rate  demand notes  and other  tax-exempt  money
market  instruments. By entering into these investments  on a joint basis, it is
expected that  a Portfolio  may earn  a  higher rate  of return  on  investments
relative to what it could earn individually.
 
    The  Fund has received a ruling from the Commission which allows each of its
Portfolios to invest the greater  of 5% of its total  assets or $2.5 million  in
the  Fund's  DSI  Money  Market Portfolio  for  cash  management  purposes. (See
"Investment Companies.")
 
REPURCHASE AGREEMENTS
 
    Each Portfolio may  invest in repurchase  agreements collateralized by  U.S.
Government securities, certificates of deposit, and certain bankers' acceptances
and   other  securities  outlined  above  under  "Short-Term  Investments."  The
Portfolio may  acquire repurchase  agreements as  long as  the Fund's  Board  of
Directors  evaluates the creditworthiness  of the brokers  or dealers with which
each Portfolio will enter into repurchase agreements. In a repurchase agreement,
a Portfolio  purchases a  security  and simultaneously  commits to  resell  that
security  at a future date to the seller (a qualified bank or securities dealer)
at an agreed  upon price plus  an agreed  upon market rate  of interest  (itself
unrelated to the coupon rate or date of maturity of the purchased security). The
seller  under a repurchase agreement  will be required to  maintain the value of
the securities subject  to the  agreement at not  less than  (1) the  repurchase
price  if  such securities  mature  in one  year  or less,  or  (2) 101%  of the
repurchase  price  if  such  securities  mature  in  more  than  one  year.  The
Administrator  and  the Adviser  will  mark to  market  daily the  value  of the
securities purchased, and the Adviser will, if necessary, require the seller  to
maintain  additional securities to  ensure that the value  is in compliance with
the previous  sentence. The  Adviser  will consider  the creditworthiness  of  a
seller  in  determining  whether  a Portfolio  should  enter  into  a repurchase
agreement.
 
    In effect, by entering into a  repurchase agreement, a Portfolio is  lending
its  funds  to the  seller at  the agreed  upon interest  rate, and  receiving a
security as collateral  for the loan.  Such agreements can  be entered into  for
periods  of one day (overnight repo) or for a fixed term (term repo). Repurchase
agreements are a common way to earn interest income on short-term funds.
 
    The use of repurchase agreements involves certain risks. For example, if the
seller of the agreement defaults on its obligation to repurchase the  underlying
securities  at  a  time when  the  value  of these  securities  has  declined, a
Portfolio may  incur a  loss upon  disposition of  them. If  the seller  of  the
agreement  becomes insolvent and subject  to liquidation or reorganization under
the Bankruptcy Code  or other laws,  a bankruptcy court  may determine that  the
underlying  securities are collateral not within  the control of a Portfolio and
therefore subject to sale by the trustee in bankruptcy. Finally, it is  possible
that  a Portfolio may not be able to substantiate its interest in the underlying
securities. While the Fund's management acknowledges these risks, it is expected
that they can be  controlled through stringent  security selection criteria  and
careful monitoring procedures. Credit screens will be established and maintained
for dealers and dealer-banks before portfolio transactions are executed for each
Portfolio.
 
    The  Fund has  applied to  the Commission for  permission to  pool the daily
uninvested cash  balances  of  the  Fund's Portfolios  in  order  to  invest  in
repurchase  agreements on a joint basis.  By entering into repurchase agreements
on a joint basis, it is expected that a Portfolio will incur lower  transactions
costs  and  potentially  obtain  higher rates  of  interest  on  such repurchase
agreements. Each Portfolio's participation in the income from jointly  purchased
repurchase  agreements will be based on that Portfolio's percentage share in the
total repurchase agreement. While  the Fund expects  to receive permission  from
the  Commission, there  can be  no assurance that  the requested  relief will be
granted.
 
                                       11
<PAGE>
   
STRIPPED SECURITIES
    
 
   
    The Sirach  Fixed  Income Portfolio  may  invest in  "stripped"  securities.
Stripped securities are usually structured with two or more classes that receive
different  proportions of the interest and  principal distributions on a pool of
U.S. Government, mortgage or asset-assets  securities. In some cases, one  class
will  receive all of the interest distributions (the interest-only class or "IO"
class), while the other  class will receive all  of the principal  distributions
(the  principal only or "PO" class). The  Portfolio does not intend to invest in
IOs. Stripped securities commonly  have greater volatility  than other types  of
fixed  income  securities.  Stripped securities  may  be  considered derivatives
securities.
    
 
RESTRICTED SECURITIES
 
    Each Portfolio may  purchase restricted securities  that are not  registered
for  sale to the general  public but which are  eligible for resale to qualified
institutional investors under Rule 144A of the Securities Act of 1933. Under the
supervision of  the  Fund's  Board  of Directors,  the  Adviser  determines  the
liquidity of such investments by considering all relevant factors. Provided that
a  dealer  or  institutional trading  market  in such  securities  exists, these
restricted securities are not treated as  illiquid securities for purposes of  a
Portfolio's investment limitations. Each of the Portfolios may also invest up to
15%  of its  net assets  (except the Sirach  Special Equity  Portfolio which may
invest up to 10% of its net assets) in securities that are illiquid by virtue of
the absence of  a readily available  market or because  of legal or  contractual
restrictions  or resale. The prices realized  from the sales of these securities
could be more or less than those  originally paid by the Portfolio or less  than
what may be considered the fair value of such securities.
 
LENDING OF SECURITIES
 
    Each Portfolio may lend its investment securities to qualified institutional
investors   who  need  to  borrow  securities   in  order  to  complete  certain
transactions, such  as  covering  short  sales,  avoiding  failures  to  deliver
securities  or  completing  arbitrage  operations.  A  Portfolio  will  not loan
portfolio securities to the extent that greater than one-third of its assets  at
fair  market  value, would  be  committed to  loans.  By lending  its investment
securities, a Portfolio attempts to increase  its income through the receipt  of
interest  on the loan.  Any gain or loss  in the market  price of the securities
loaned that might occur during the term of the loan would be for the account  of
the  Portfolio.  A Portfolio  may lend  its  investment securities  to qualified
brokers, dealers, domestic and foreign banks or other financial institutions, so
long as the terms, the structure and the aggregate amount of such loans are  not
inconsistent  with the  Investment Company Act  of 1940, as  amended, (the "1940
Act") or  the  Rules  and  Regulations  or  interpretations  of  the  Commission
thereunder,  which currently require  that (a) the  borrower pledge and maintain
with the  Portfolio collateral  consisting  of cash,  an irrevocable  letter  of
credit  issued by a domestic U.S. bank or securities issued or guaranteed by the
United States Government having a value at  all times not less than 100% of  the
value of the securities loaned, (b) the borrower add to such collateral whenever
the  price of  the securities  loaned rises  (i.e., the  borrower "marks  to the
market" on a daily basis),  (c) the loan be made  subject to termination by  the
Portfolio at any time, and (d) the Portfolio receives reasonable interest on the
loan  (which may include the Portfolio investing any cash collateral in interest
bearing short-term investments). As  with other extensions  of credit there  are
risks  of delay in recovery  or even loss of rights  in the securities loaned if
the borrower of the securities fails financially. These risks are similar to the
ones involved with repurchase agreements as discussed above. All relevant  facts
and  circumstances,  including the  creditworthiness  of the  broker,  dealer or
institution, will be considered in making decisions with respect to the  lending
of securities, subject to review by the Fund's Board of Directors.
 
    At  the present  time, the  Staff of  the Commission  does not  object if an
investment company pays  reasonable negotiated  fees in  connection with  loaned
securities so long as such fees are set forth in a written contract and approved
by  the investment company's Board of  Directors. The Portfolio will continue to
retain any voting rights  with respect to the  loaned securities. If a  material
event  occurs affecting an investment on a loan, the loan must be called and the
securities voted.
 
PORTFOLIO TURNOVER
 
   
    Generally, the  Portfolios  will  not trade  in  securities  for  short-term
profits,  but, when circumstances warrant, securities may be sold without regard
to length of  time held.  It should  be understood  that the  rate of  portfolio
turnover  will depend  upon market and  other conditions,  and it will  not be a
limiting  factor  when   the  Adviser  believes   that  portfolio  changes   are
appropriate.  The  portfolio turnover  for the  Sirach  Equity Portfolio  is not
anticipated to exceed 125%. A rate of turnover of 100% would occur, for example,
if all the securities held by a  Portfolio were replaced within a period of  one
year.  High rates  of portfolio  turnover necessarily  result in correspondingly
heavier brokerage and portfolio trading costs which are paid by the  Portfolios.
In addition to
    
 
                                       12
<PAGE>
Portfolio  trading costs, higher  rates of portfolio turnover  may result in the
realization of capital  gains. To the  extent net short-term  capital gains  are
realized,  any distributions resulting  from such gains  are considered ordinary
income  for  federal  income  tax  purposes.  (See  "Dividends,  Capital   Gains
Distributions  and Taxes" for more information on taxation.) The Portfolios will
not normally engage in short-term trading, but each reserves the right to do so.
The tables set forth in  "Financial Highlights" presents the Sirach  Portfolios'
historical portfolio turnover ratios.
 
WHEN-ISSUED, FORWARD DELIVERY AND DELAYED SETTLEMENT SECURITIES
 
    Each Portfolio may purchase and sell securities on a "when-issued," "delayed
settlement,"  or "forward  delivery" basis. "When-issued"  or "forward delivery"
refers to securities whose  terms and indenture are  available, and for which  a
market  exists, but which are not  available for immediate delivery. When-issued
or forward delivery transactions may be expected to occur a month or more before
delivery is due. Delayed settlement is a  term used to describe settlement of  a
securities  transaction in the secondary market which will occur sometime in the
future. No payment or delivery is made by a Portfolio until it receives  payment
or  delivery  from the  other  party to  any of  the  above transactions.  It is
possible that the market price of the securities at the time of delivery may  be
higher or lower than the purchase price. Each Portfolio will maintain a separate
account of cash, U.S. Government securities or other high-grade debt obligations
at  least equal  to the  value of  purchase commitments  until payment  is made.
Typically, no income accrues on securities purchased on a delayed delivery basis
prior to the time delivery of the securities is made although the Portfolio  may
earn income on securities it has deposited in a segregated account.
 
    Each  Portfolio may  engage in  when-issued transactions  to obtain  what is
considered to be an advantageous price and yield at the time of the transaction.
When a Portfolio  engages in  when-issued or forward  delivery transactions,  it
will  do  so  for  the  purpose  of  acquiring  securities  consistent  with its
investment objective  and  policies  and  not for  the  purposes  of  investment
leverage.
 
INVESTMENT COMPANIES
 
    As permitted by the 1940 Act, each Portfolio reserves the right to invest up
to  10%  of its  total  assets, calculated  at the  time  of investment,  in the
securities of other open-end or closed-end investment companies. No more than 5%
of the investing Portfolio's total assets  may be invested in the securities  of
any  one  investment company  nor  may it  acquire more  than  3% of  the voting
securities of any other investment  company. The Portfolio will indirectly  bear
its  proportionate share of any management fees paid by an investment company in
which it invests in addition to the advisory fee paid by the Portfolio.
 
    The Fund has received a ruling from the Commission which allows each of  its
Portfolios  to invest the greater  of 5% of its total  assets or $2.5 million in
the Fund's DSI Money Market Portfolio for cash management purposes provided that
the investment  is  consistent  with the  Portfolio's  investment  policies  and
restrictions. Based upon the Portfolio's assets invested in the DSI Money Market
Portfolio,  the investing Portfolio's adviser will waive its investment advisory
fee and any other fees earned as  a result of the Portfolio's investment in  the
DSI  Money Market Portfolio.  The investing Portfolio will  bear expenses of the
DSI Money Market Portfolio on the same basis as all of its other shareholders.
 
FOREIGN INVESTMENTS
 
    Investors should  recognize that  investing  in foreign  companies  involves
certain special considerations which are not typically associated with investing
in   U.S.  companies.  Since  the  stocks  of  foreign  companies  are  normally
denominated in foreign currencies,  the Portfolio may  be affected favorably  or
unfavorably  by changes in  currency rates and  in exchange control regulations,
and may incur costs in connection with conversions between various currencies.
 
    As non-U.S.  companies  are not  generally  subject to  uniform  accounting,
auditing  and financial  reporting standards  and practices  comparable to those
applicable to U.S. companies, there  may be less publicly available  information
about  certain foreign companies  than about U.S.  companies. Securities of some
non-U.S. companies  may be  less liquid  and more  volatile than  securities  of
comparable  U.S.  companies.  In  addition,  with  respect  to  certain  foreign
countries, there is the possibility  of expropriation or confiscatory  taxation,
political  or social instability, or  diplomatic developments which could affect
U.S. investments in those countries.
 
FUTURES CONTRACTS AND OPTIONS
 
    In order to  remain fully  invested, and  to reduce  transaction costs,  the
Sirach  Fixed  Income Portfolio  may utilize  appropriate futures  contracts and
options to a  limited extent.  Specifically, the  Portfolio may  invest in  bond
 
                                       13
<PAGE>
futures  and options and interest rate  futures contracts. For example, in order
to remain  fully exposed  to  the movements  of  the market,  while  maintaining
liquidity  to meet potential shareholder redemptions, the Portfolio may invest a
portion of  its assets  in  bond or  interest  rate futures  contracts.  Because
futures  contracts only  require a small  initial margin  deposit, the Portfolio
would then  be  able  to  keep  a  cash  reserve  available  to  meet  potential
redemptions,  while at  the same  time being  effectively fully  invested. Also,
because transaction costs associated with futures and options may be lower  than
the  costs of investing in bonds directly, it  is expected that the use of index
futures and options to facilitate cash flows may reduce the Portfolio's  overall
transactions costs. The Portfolio may enter into futures contracts provided that
not  more than 5% of the Portfolio's total assets are at the time of acquisition
required as  margin deposit  to  secure obligations  under such  contracts.  The
Portfolio  will engage in futures and  options transactions for hedging purposes
only.
 
    The primary risks  associated with the  use of futures  and options are  (1)
imperfect  correlation between the change in market value of the securities held
by the Portfolio and  the prices of  futures and options  relating to the  bonds
purchased  or sold by the Portfolio; and (2) possible lack of a liquid secondary
market for a futures contract or option  and the resulting inability to close  a
futures  position which could have an  adverse impact on the Portfolio's ability
to hedge. In the opinion of the  Directors, the risk that the Portfolio will  be
unable  to close out a futures position or options contract will be minimized by
only entering into futures contracts or options transactions traded on  national
exchanges and for which there appears to be a liquid secondary market.
 
    Except  as specified above and  as described under "INVESTMENT LIMITATIONS,"
the foregoing  investment policies  are not  fundamental and  the Directors  may
change  such  policies  without  an  affirmative  vote  of  a  "majority  of the
outstanding voting securities of a Portfolio," as defined in the 1940 Act.
 
                             INVESTMENT LIMITATIONS
 
    Each Portfolio  has  adopted  certain limitations  designed  to  reduce  its
exposure  to risk in specific  situations. Some of these  limitations are that a
Portfolio will not:
 
    (a) with respect to  75% of its  assets, invest  more than 5%  of its  total
        assets  at the time of  purchase in the securities  of any single issuer
        (other than  obligations  issued  or  guaranteed  as  to  principal  and
        interest  by the government of the U.S. or any agency or instrumentality
        thereof);
 
    (b) with respect to 75% of its assets,  purchase more than 10% of any  class
        of the outstanding voting securities of any issuer;
 
    (c) invest  more  than 5%  of  its assets  at the  time  of purchase  in the
        securities of  companies  that  have (with  predecessors)  a  continuous
        operating history of less than 3 years;
 
    (d) acquire  any securities of companies within one industry if, as a result
        of such acquisition, more than 25% of the value of the Portfolio's total
        assets  would  be  invested  in  securities  of  companies  within  such
        industry;  provided, however, that  there shall be  no limitation on the
        purchase of obligations issued or guaranteed by the U.S. Government, its
        agencies or instrumentalities, or instruments issued by U.S. banks  when
        a Portfolio adopts a temporary defensive position;
 
    (e) make  loans  except  (i)  by  purchasing  bonds,  debentures  or similar
        obligations  which  are  publicly  distributed,  (including   repurchase
        agreements  provided,  however, that  repurchase agreements  maturing in
        more than seven  days, together  with securities which  are not  readily
        marketable,  will not exceed  10% of the  Portfolio's total assets), and
        (ii) by lending its portfolio securities to banks, brokers, dealers  and
        other  financial institutions so long as such loans are not inconsistent
        with the 1940 Act or the Rules and Regulations or interpretations of the
        Commission thereunder;
 
    (f) (i)  borrow,  except  from  banks   and  as  a  temporary  measure   for
        extraordinary  or emergency purposes and then, in no event, in excess of
        33 1/3% (10% for the Sirach Special Equity Portfolio) of the Portfolio's
        gross assets valued at the lower of market or cost, and (ii) a Portfolio
        may not  purchase additional  securities when  borrowings exceed  5%  of
        total assets; or
 
    (g) pledge,  mortgage or hypothecate any of  its assets to an extent greater
        than 10% of its total assets at fair market value.
 
    The investment objectives of the Portfolios are fundamental and with respect
to each Portfolio  may be changed  only with the  approval of the  holders of  a
majority  of the  outstanding shares of  such Portfolio.  Except for limitations
(d), (e) and (f)(i), the Sirach Strategic Balanced, Sirach Growth, Sirach  Fixed
Income, Sirach Short-
 
                                       14
<PAGE>
Term  Reserves and Sirach Equity Portfolios' investment limitations and policies
described in this Prospectus and in the Statement of Additional Information  are
not  fundamental  and may  be  changed by  the  Fund's Board  of  Directors upon
reasonable notice to investors. The investment limitations of the Sirach Special
Equity Portfolio described here and  in the Statement of Additional  Information
are  fundamental  policies and  may be  changed  only with  the approval  of the
holders of  a  majority  of  the  outstanding shares  of  the  Portfolio.  If  a
percentage  limitation on investment or utilization of assets as set forth above
is adhered to at the  time an investment is made,  a later change in  percentage
resulting from changes in the value or total cost of the Portfolios' assets will
not be considered a violation of the restriction.
 
                             INVESTMENT SUITABILITY
 
    The  Sirach  Portfolios were  designed  principally for  the  investments of
institutional investors. The  Sirach Strategic Balanced  Portfolio is  available
for purchase by individuals and may be suitable for investors who seek long-term
growth of capital consistent with reasonable risk to principal by investing in a
diversified  portfolio of common stocks and  fixed income securities. The Sirach
Growth Portfolio is available  for purchase by individuals  and may be  suitable
for  investors who seek long-term capital growth consistent with reasonable risk
to principal by  investing primarily in  common stocks of  companies that  offer
long-term  growth potential. The Sirach Fixed  Income Portfolio is available for
purchase by individuals and may be suitable for investors who seek above-average
total return  with  reasonable  risk  to principal  by  investing  primarily  in
investment  grade  fixed  income  securities.  The  Sirach  Short-Term  Reserves
Portfolio is  available for  purchase by  individuals and  may be  suitable  for
investors  who seek competitive rates of  return consistent with the maintenance
of principal  and liquidity  by investing  primarily in  investment grade  fixed
income  securities with an average weighted maturity of three years or less. The
Sirach Special Equity Portfolio is available for purchase by individuals and may
be  suitable  for  investors  who  seek  maximum  long-term  growth  of  capital
consistent  with reasonable risk  to principal, by investing  in small to medium
capitalized companies with particularly attractive financial characteristics. No
mutual fund can guarantee that its investment objective will be met. The  Sirach
Equity  Portfolio is available  for purchase by individuals  and may be suitable
for investors  who seek  maximum  long-term growth  of capital  consistent  with
reasonable  risk  to  principal,  by investing  in  small  to  large capitalized
companies with attractive long-term growth potential.
 
                               PURCHASE OF SHARES
 
    Shares of each Portfolio may be purchased, without sales commission, at  the
net asset value per share next determined after an order is received by the Fund
and  payment  is received  by the  Custodian. (See  "VALUATION OF  SHARES.") The
minimum initial investment required is $2,500 except that, for 401(k) plans  the
minimum  initial investment is $1,000. Certain  exceptions may be made from time
to time by the officers of the Fund.
 
INITIAL INVESTMENTS BY MAIL
 
    An account may be opened by  completing and signing an Account  Registration
Form, and mailing it, together with a check payable to UAM Funds, Inc., to:
 
                                UAM Funds, Inc.
                            UAM Funds Service Center
                    c/o Chase Global Funds Services Company
                                 P.O. Box 2798
                             Boston, MA 02208-2798
 
    The  carbon copy (manually signed) of  the Account Registration Form must be
delivered to:
 
                          UAM Fund Distributors, Inc.
                              211 Congress Street
                                Boston, MA 02110
 
    Payment for the purchase of shares received by mail will be credited to your
account at the net asset value per share of the Portfolio next determined  after
receipt.  Such payment need not be converted into Federal Funds (monies credited
to the Fund's Custodian Bank by a Federal Reserve Bank) before acceptance by the
Fund.
 
INITIAL INVESTMENTS BY WIRE
 
    Shares of each Portfolio  may also be purchased  by wiring Federal Funds  to
the  Fund's Custodian Bank  (see instructions below). In  order to insure prompt
crediting of the Federal Funds wire, it is important to follow these steps:
 
                                       15
<PAGE>
    (a) Telephone the  Fund's  Transfer  Agent  (toll-free  1-800-638-7983)  and
        provide  the account name, address, telephone number, social security or
        taxpayer identification number, the Portfolio selected, the amount being
        wired and  the  name of  the  bank  wiring the  funds.  (Investors  with
        existing accounts should also notify the Fund prior to wiring funds.) An
        account number will then be provided to you;
 
    (b) Instruct your bank to wire the specified amount to the Fund's Custodian;
 
   
                               The Chase Manhattan Bank
                                    ABA #021000021
                                       UAM Funds
                           DDA Acct. Credit DDA #9102772952
                                  Ref: Portfolio Name
                              --------------------------
                               Your Account Registration
                              --------------------------
                                  Your Account Number
                              --------------------------
                                  Wire Control Number
    
                              --------------------------
 
    (c) A  completed Account Registration Form must be forwarded to the Fund and
        UAM Fund Distributors, Inc.  at the addresses shown  thereon as soon  as
        possible.  Federal Funds  purchases will  be accepted  only on  a day on
        which the New York  Stock Exchange and the  Custodian Bank are open  for
        business.
 
ADDITIONAL INVESTMENTS
 
    You  may add to your  account at any time  (minimum additional investment is
$100) by  purchasing  shares at  net  asset value  by  mailing a  check  to  the
Administrator  (payable to "UAM Funds, Inc.") at  the above address or by wiring
monies to the Custodian Bank using  the instructions outlined above. It is  very
important  that  your account  number,  account name,  and  the Portfolio  to be
purchased are specified on the check or wire to insure proper crediting to  your
account. In order to insure that your wire orders are invested promptly, you are
requested  to notify the Fund (toll-free 1-800-638-7983) prior to the wire date.
Mail orders  should include,  when possible,  the "Invest  by Mail"  stub  which
accompanies any Fund confirmation statement.
 
OTHER PURCHASE INFORMATION
 
    The  purchase price of the  shares of each Portfolio  is the net asset value
next determined after  the order  and payment  is received.  (See "VALUATION  OF
SHARES.")  An order received prior to the 4:00  p.m. close of the New York Stock
Exchange (the "NYSE")  will be executed  at the  price computed on  the date  of
receipt;  an  order received  after  the 4:00  p.m. close  of  the NYSE  will be
executed at the price computed on the next day the NYSE is open.
 
    The Fund reserves the right, in its sole discretion, to suspend the offering
of shares of each Portfolio or reject purchase orders when, in the judgement  of
management, such suspension or rejection is in the best interests of the Fund.
 
    Purchases of a Portfolio's shares will be made in full and fractional shares
of  the Portfolio calculated to three decimal places. In the interest of economy
and convenience,  certificates for  shares  will not  be  issued except  at  the
written request of the shareholder. Certificates for fractional shares, however,
will not be issued.
 
    Shares of the Portfolios may be purchased by customers of brokers-dealers or
other  financial  intermediaries  ("Service Agents")  which  have  established a
shareholder servicing relationship with the  Fund on behalf of their  customers.
Service  Agents may impose additional or different conditions on the purchase or
redemption of Portfolio shares by their customers and may charge their customers
transaction or other account  fees on the purchase  and redemption of  Portfolio
shares.  Each Service Agent  is responsible for transmitting  to its customers a
schedule of any such fees and information regarding any additional or  different
conditions  regarding purchases and redemptions.  Shareholders who are customers
of Service Agents should consult  their Service Agent for information  regarding
these   fees  and  conditions.  Amounts  paid  to  Service  Agents  may  include
transaction fees  and/or service  fees paid  by the  Fund from  the Fund  assets
attributable  to the Service Agent, and which  would not be imposed if shares of
the Portfolio were  purchased directly  from the  Fund or  the Distributor.  The
Service  Agents may provide shareholder services to their customers that are not
available to a shareholder dealing directly with the Fund. A salesperson and any
other person entitled to receive compensation for selling or servicing Portfolio
shares may receive different compensation  with respect to one particular  class
of shares over another in the Fund.
 
    Service  Agents  may  enter confirmed  purchase  orders on  behalf  of their
customers. If you buy shares  of a Portfolio in  this manner, the Service  Agent
must  receive your investment order before the close of trading on the NYSE, and
transmit it to  the Fund's Transfer  Agent prior  to the close  of the  Transfer
Agent's business day and to
 
                                       16
<PAGE>
the  Distributor to receive that day's share price. Proper payment for the order
must be received by the Transfer Agent no later than the time when the Portfolio
is priced on the following business day. Service Agents are responsible to their
customers, the Fund and  the Fund's Distributor for  timely transmission of  all
subscription  and redemption requests, investment information, documentation and
money.
 
IN-KIND PURCHASES
 
    If accepted  by the  Fund, shares  of  each Portfolio  may be  purchased  in
exchange  for securities which are eligible for acquisition by the Portfolio, as
described in this Prospectus. Securities to  be exchanged which are accepted  by
the  Fund will be valued as set forth under "VALUATION OF SHARES" at the time of
the next determination of net asset  value after such acceptance. Shares  issued
by  a Portfolio  in exchange for  securities will  be issued at  net asset value
determined as of the same time. All dividends, interest, subscription, or  other
rights  pertaining to such securities shall become the property of the Portfolio
and must be delivered to the Fund by the investor upon receipt from the  issuer.
Securities  acquired through an in-kind purchase will be acquired for investment
and not for immediate resale.
 
    The Fund will not  accept securities in exchange  for shares of a  Portfolio
unless:  (1) such securities  are, at the  time of the  exchange, eligible to be
included in the Portfolio  and current market  quotations are readily  available
for  such securities; (2) the investor represents and agrees that all securities
offered  to  be  exchanged  are  liquid  securities  and  not  subject  to   any
restrictions  upon their sale by the Portfolio under the Securities Act of 1933,
or otherwise; and (3) the value  of any such securities (except U.S.  Government
securities)  being exchanged together  with other securities  of the same issuer
owned by the Portfolio  will not exceed  5% of the net  assets of the  Portfolio
immediately after the transaction.
 
    A gain or loss for Federal income tax purposes will be realized by investors
who are subject to Federal taxation upon the exchange depending upon the cost of
the  securities  or  local  currency  exchanged.  Investors  interested  in such
exchanges should contact the Adviser.
 
                              REDEMPTION OF SHARES
 
    Shares of each Portfolio may be redeemed  by mail or telephone at any  time,
without  cost, at  the net  asset value of  the Portfolio  next determined after
receipt of  the redemption  request.  No charge  is  made for  redemptions.  Any
redemption  may be more or less than the purchase price of your shares depending
on the market value of the investment securities held by the Portfolio.
 
BY MAIL
 
    Each Portfolio will redeem its shares at the net asset value next determined
on the date  the request is  received in  "good order". Your  request should  be
addressed to:
 
                            UAM Funds Service Center
                    c/o Chase Global Funds Services Company
                                 P.O. Box 2798
                             Boston, MA 02208-2798
 
    "Good  order"  means that  the  request to  redeem  shares must  include the
following documentation:
 
    (a) The stock certificates, if issued;
 
    (b) A letter of instruction or a  stock assignment specifying the number  of
        shares  or dollar amount to be redeemed, signed by all registered owners
        of the shares in the exact names in which they are registered;
 
    (c) Any required signature  guarantees (see  "Signature Guarantees"  below);
        and
 
    (d) Other  supporting legal documents, if required,  in the case of estates,
        trusts, guardianships, custodianships, corporations, pension and  profit
        sharing plans and other organizations.
 
    Shareholders who are uncertain of requirements for redemption should contact
the UAM Funds Service Center.
 
SIGNATURE GUARANTEES
 
    To  protect  your  account, the  Fund  and  the Transfer  Agent  from fraud,
signature guarantees are required for certain redemptions. Signature  guarantees
are  required for (1) redemptions  where the proceeds are  to be sent to someone
other than the registered shareowner(s) or the registered address, or (2)  share
transfer requests. The purpose of signature guarantees is to verify the identity
of the party who has authorized a redemption.
 
                                       17
<PAGE>
    Signatures  must  be guaranteed  by an  "eligible guarantor  institution" as
defined in Rule  17Ad-15 under  the Securities  Exchange Act  of 1934.  Eligible
guarantor  institutions include banks, brokers, dealers, credit unions, national
securities exchanges, registered securities associations, clearing agencies  and
savings  associations. A complete definition  of eligible guarantor institutions
is available  from the  Transfer Agent.  Broker-dealers guaranteeing  signatures
must  be a member of a clearing corporation  or maintain net capital of at least
$100,000. Credit  unions  must  be authorized  to  issue  signature  guarantees.
Signatures  guarantees will be accepted  from any eligible guarantor institution
which participates in a signature guarantee program.
 
    The signature guarantee must appear either:  (1) on the written request  for
redemption;  (2) on a  separate instrument for  assignment ("stock power") which
should specify the total number  of shares to be redeemed;  or (3) on all  stock
certificates  tendered for redemption and,  if shares held by  the Fund are also
being redeemed, on the letter or stock power.
 
BY TELEPHONE
 
    Provided you have previously established the telephone redemption  privilege
by completing an Account Registration Form, you may request a redemption of your
shares  by calling the Fund and requesting  the redemption proceeds be mailed to
you or wired to your  bank. The Fund and the  Fund's Transfer Agent will  employ
reasonable procedures to confirm that instructions communicated by telephone are
genuine,  and they may  be liable for  any losses if  they fail to  do so. These
procedures  include  requiring   the  investor  to   provide  certain   personal
identification  at the  time an  account is opened  and prior  to effecting each
transaction requested  by  telephone.  In addition,  all  telephone  transaction
requests  will be recorded  and investors may be  required to provide additional
telecopied written  instructions  of  such transaction  requests.  The  Fund  or
Transfer  Agent may be liable  for any losses due  to unauthorized or fraudulent
telephone instructions if the Fund or  the Transfer Agent does not employ  these
procedures.  Neither the Fund nor the Transfer Agent will be responsible for any
loss,  liability,  cost  or  expense  for  following  instructions  received  by
telephone that it reasonably believes to be genuine.
 
    To  change the  name of  the commercial  bank or  the account  designated to
receive redemption proceeds, a written request must  be sent to the Fund at  the
address  above. Requests to  change the bank  or account must  be signed by each
shareholder and each signature must be  guaranteed. You cannot redeem shares  by
telephone if you hold stock certificates for these shares. Please contact one of
the Fund's representatives at the Administrator for further details.
 
FURTHER REDEMPTION INFORMATION
 
    Normally,  the Fund  will make  payment for  all shares  redeemed under this
procedure within one business  day of receipt  of the request,  but in no  event
will  payment be made more than seven days after receipt of a redemption request
in good order. The Fund may suspend the right of redemption or postpone the date
at times  when  both the  NYSE  and Custodian  Bank  are closed,  or  under  any
emergency circumstances as determined by the Commission.
 
    If  the Board of  Directors determines that  it would be  detrimental to the
best interests of the remaining shareholders of the Fund to make payment  wholly
or  partly in cash, the Fund may pay the redemption proceeds in whole or in part
by a distribution in-kind of  liquid securities held by  a Portfolio in lieu  of
cash  in conformity with applicable rules of the Commission. Investors may incur
brokerage charges on the sale of portfolio securities so received in payment  of
redemptions.
 
                              SHAREHOLDER SERVICES
 
EXCHANGE PRIVILEGE
 
    Institutional  Class Shares  of each Sirach  Portfolio may  be exchanged for
Institutional  Class  Shares  of  the  other  Sirach  Portfolios.  In  addition,
Institutional  Class Shares  of each Sirach  Portfolio may be  exchanged for any
other Institutional Class Shares of a Portfolio included in the UAM Funds  which
is comprised of the Fund and UAM Funds Trust. (See the list of Portfolios of the
UAM  Funds - Institutional Class Shares at the end of this Prospectus.) Exchange
requests should be made  by calling the Fund  (1-800-638-7983) or by writing  to
UAM  Funds, UAM Funds  Service Center, c/o Chase  Global Funds Services Company,
P.O. Box 2798, Boston, MA 02208-2798.  The exchange privilege is only  available
with respect to Portfolios that are registered for sale in a shareholder's state
of residence.
 
    Any  such exchange will be  based on the respective  net asset values of the
shares involved. There  is no  sales commission or  charge of  any kind.  Before
making  an exchange into  a Portfolio, a shareholder  should read its Prospectus
and consider the investment objectives of the Portfolio to be purchased. You may
obtain a Prospectus for  the Portfolio(s) you are  interested in by calling  the
UAM Funds Service Center at 1-800-638-7983.
 
                                       18
<PAGE>
    Exchange  requests  may  be  made either  by  mail  or  telephone. Telephone
exchanges will  be  accepted only  if  the certificates  for  the shares  to  be
exchanged  are  held by  the Fund  for the  account of  the shareholder  and the
registration of  the two  accounts  will be  identical. Requests  for  exchanges
received  prior to 4:00 p.m. (Eastern Time) will be processed as of the close of
business on the same day. Requests received after 4:00 p.m. will be processed on
the next  business day.  Exchanges may  also  be subject  to limitations  as  to
amounts  or  frequency and  to other  restrictions established  by the  Board of
Directors to assure  that such exchanges  do not disadvantage  the Fund and  its
shareholders.  For  additional  information  regarding  responsibility  for  the
authenticity of  telephoned  instructions,  see  "Redemption  of  Shares  --  By
Telephone" above.
 
    For  Federal income  tax purposes,  an exchange  between Funds  is a taxable
event, and accordingly, a  capital gain or  loss may be  realized. In a  revenue
ruling  relating to  circumstances similar  to the  Fund's, an  exchange between
series of a Fund was also deemed to be a taxable event. It is likely, therefore,
that a capital gain or loss would be realized on an exchange between Portfolios.
You may want to consult your tax adviser for further information in this regard.
The exchange privilege may be modified or terminated at any time.
 
TRANSFER OF REGISTRATION
 
    You may transfer  the registration  of any of  your Fund  shares to  another
person  by writing  to the UAM  Funds at  the above address.  As in  the case of
redemptions, the  written request  must be  received in  good order  before  any
transfer can be made. (See "Redemption of Shares.")
 
                              VALUATION OF SHARES
 
    The  net asset value of each Portfolio  is determined by dividing the sum of
the total market value of the Portfolio's investments and other assets, less any
liabilities, by the  total outstanding shares  of the Portfolio.  The net  asset
value  per share of each Portfolio is determined  as of the close of the NYSE on
each day that the NYSE is open for business.
 
    Equity  securities  listed  on  a  securities  exchange  for  which   market
quotations are readily available are valued at the last quoted sale price on the
day  the valuation is made. Price information on listed securities is taken from
the exchange where the security is primarily traded. Unlisted equity  securities
and  listed  securities  not  traded  on the  valuation  date  for  which market
quotations are  readily available  are valued  not exceeding  the current  asked
prices  nor less than the current bid prices. For valuation purposes, quotations
of foreign  securities  in a  foreign  currency  are converted  to  U.S.  dollar
equivalents  based upon  the bid price  of such currencies  against U.S. dollars
quoted by any major bank or by a broker.
 
    Bonds and other fixed income securities are valued according to the broadest
and most representative  market, which will  ordinarily be the  over-the-counter
market.  Net asset values include interest  on fixed income securities, which is
accrued daily.
 
    In addition, bonds and  other fixed income securities  may be valued on  the
basis  of prices provided by a pricing  service when such prices are believed to
reflect the  fair market  value of  such securities.  The prices  provided by  a
pricing  service are determined without  regard to bid or  last sale prices, but
take into account institutional size trading in similar groups of securities and
any developments related to  the specific securities.  Securities not priced  in
this  manner are  valued at  the most  recent quoted  bid price,  or, when stock
exchange valuations are  used, at the  latest quoted  sale price on  the day  of
valuation.  If there is no such reported  sale, the latest quoted bid price will
be used. Securities purchased with remaining  maturities of 60 days or less  are
valued  at amortized cost when the  Board of Directors determines that amortized
cost reflects fair value. In the event that amortized cost does not  approximate
market, market prices as determined above will be used.
 
    The value of other assets and securities for which no quotations are readily
available  (including restricted securities) is determined in good faith at fair
value using methods determined by the Directors.
 
                DIVIDENDS, CAPITAL GAINS DISTRIBUTIONS AND TAXES
 
DIVIDENDS AND CAPITAL GAINS DISTRIBUTIONS
 
    Each Portfolio  will  normally  distribute  substantially  all  of  its  net
investment income to shareholders in the form of quarterly dividends. If any net
capital  gains are realized, each Portfolio  will normally distribute such gains
with the last dividend for the fiscal year.
 
                                       19
<PAGE>
    Undistributed net investment income is included in a Portfolio's net  assets
for  the purpose  of calculating  net asset value  per share.  Therefore, on the
"ex-dividend" date, the net asset value  per share excludes the dividend  (i.e.,
is  reduced by  the per  share amount of  the dividend).  Dividends paid shortly
after the purchase  of shares by  an investor,  although in effect  a return  of
capital, are taxable to shareholders.
 
    Each   Portfolio's  dividend   and  capital  gains   distributions  will  be
automatically reinvested in additional shares  of the Portfolio unless the  Fund
is  notified in writing that the  shareholder elects to receive distributions in
cash.
 
FEDERAL TAXES
 
    Each Portfolio  intends to  qualify  each year  as a  "regulated  investment
company"  under the Internal Revenue Code of  1986, as amended (the "Code"), and
if it qualifies, will not  be liable for Federal income  taxes to the extent  it
distributes its net investment income and net realized capital gains. Dividends,
either  in cash or reinvested in shares, paid by a Portfolio from net investment
income will be taxable to shareholders  as ordinary income. Dividends paid  from
the  Sirach Strategic Balanced, Sirach Special  Equity, Sirach Growth and Sirach
Equity  Portfolios  will  generally  qualify  for  the  70%  dividends  received
deduction  for corporations, but the portion  of the dividends so qualified will
depend on the ratio of the aggregate taxable qualifying dividend income received
by the Portfolio from domestic (U.S.)  sources to the Portfolio's total  taxable
income, exclusive of long-term capital gains.
 
    Whether paid in cash or additional shares of the Portfolio and regardless of
the  length  of  time  the  shares  in the  Portfolio  have  been  owned  by the
shareholder,  distributions  from  long-term   capital  gains  are  taxable   to
shareholders as such, but are not eligible for the dividends received deduction.
Shareholders  are notified  annually by  the Fund  as to  Federal tax  status of
dividends  and  distributions   paid  by   a  Portfolio.   Such  dividends   and
distributions may also be subject to state and local taxes.
 
    Redemptions  of shares in a Portfolio  are taxable events for Federal income
tax purposes. A shareholder may also be subject to state and local taxes on such
redemptions.
 
    Each Portfolio  intends  to  declare  and pay  dividend  and  capital  gains
distributions  so as to  avoid imposition of  the Federal Excise  Tax. To do so,
each Portfolio expects to distribute an amount equal to (1) 98% of its  calendar
year  ordinary income, (2)  98% of its  capital gains net  income (the excess of
short and long-term capital gains over  short and long-term capital losses)  for
the  one-year  period ending  October 31st,  and (3)  100% of  any undistributed
ordinary or capital gain net income  from the prior year. Dividends declared  in
December  will  be  deemed  to  have  been paid  by  the  Fund  and  received by
shareholders on the  record date  provided that  the dividends  are paid  before
February 1 of the following year.
 
    The  Fund is required by Federal law  to withhold 31% of reportable payments
(which may include dividends, capital gains distributions, and redemptions) paid
to  shareholders  who  have  not  complied  with  IRS  taxpayer   identification
regulations. In order to avoid this withholding requirement, you must certify on
the  Account Registration Form or  on a separate form  supplied by the Fund that
your Social Security or Taxpayer  Identification Number provided is correct  and
that you are not currently subject to backup withholding, or that you are exempt
from backup withholding.
 
STATE AND LOCAL TAXES
 
    Shareholders  may also be subject to  state and local taxes on distributions
from the Fund. Shareholders should consult with their tax advisers with  respect
to the tax status of distributions from the Fund in their state and locality.
 
                               INVESTMENT ADVISER
 
    Sirach   Capital  Management,   Inc.  is  a   Washington  corporation  whose
predecessor was formed in 1970 and is located at 3323 One Union Square, Seattle,
Washington 98101.  The Adviser  is  a wholly-owned  subsidiary of  United  Asset
Management  Corporation ("UAM")  and provides investment  management services to
corporations, pension and profit-sharing plans, 401(k) and thrift plans, trusts,
estates and  other  institutions  and  individuals.  As  of  the  date  of  this
Prospectus,  the Adviser had  over $5.4 billion in  assets under management. For
further information on  Sirach Capital Management,  Inc.'s investment  services,
please call (206) 624-3800.
 
    The  investment professionals of  the Adviser who  are primarily responsible
for the day-to-day  management of  the Sirach  Portfolios and  a description  of
their business experience during the past five years are as follows:
 
    SIRACH  STRATEGIC  BALANCED PORTFOLIO  --   George  B. Kauffman,  Stephen J.
Romano, and Robert L. Stephenson, Jr.;
 
                                       20
<PAGE>
    SIRACH GROWTH PORTFOLIO --  George B. Kauffman and Harvey G. Bateman;
 
    SIRACH FIXED INCOME PORTFOLIO --  Stephen J. Romano and Harvey G. Bateman;
 
    SIRACH SHORT-TERM RESERVES  PORTFOLIO --   Stephen J. Romano  and Harvey  G.
Bateman; and
 
    SIRACH SPECIAL EQUITY PORTFOLIO --  Harvey G. Bateman and Stefan W. Cobb.
 
    SIRACH EQUITY PORTFOLIO --  Harvey G. Bateman and George B. Kauffman
 
    HARVEY G. BATEMAN, CFA, CIC -- PRINCIPAL.  Mr. Bateman joined the Adviser in
1988.  He  has managed  equity funds  for  the Adviser  since 1989.  Mr. Bateman
assumed responsibility for managing  the Special Equity  Portfolio in 1989,  the
Fixed Income and Short-Term Reserves Portfolios in 1994, the Growth Portfolio in
1995 and the Equity Portfolio in 1996.
 
    GEORGE  B. KAUFFMAN, CFA, CIC -- PRINCIPAL.  Mr. Kauffman joined the Adviser
in 1981. He has managed  balanced and growth funds  for the Adviser since  1981.
Mr.  Kauffman assumed responsibility for managing the Strategic Balanced, Growth
Portfolios in 1993 and the Equity Portfolio in 1996.
 
    ROBERT L. STEPHENSON, JR., CFA, CIC -- PRINCIPAL.  Mr. Stephenson joined the
Adviser in 1987. He has managed balanced and growth funds for the Adviser  since
1987.  Mr. Stephenson assumed responsibility for managing the Strategic Balanced
Portfolio in 1993.
 
    STEPHEN J. ROMANO, CFA, CIC -- PRINCIPAL.  Mr. Romano joined the Adviser  in
1991.  Prior  to  that, he  was  a  Senior Investment  Officer  at Seattle-First
National Bank where he  managed equity and fixed  income portfolios for  private
banking clients. Mr. Romano has managed fixed income funds for the Adviser since
1991.  He assumed  responsibility for managing  the Fixed  Income and Short-Term
Reserves Portfolios in 1993.
 
    STEFAN W. COBB -- PRINCIPAL.  Mr. Cobb joined the Adviser in 1994. Prior  to
that,  he was  a Vice  President at  the investment  banking firm  of Robertson,
Stephens & Company where he was engaged in institutional sales. Mr. Cobb assumed
the responsibility for managing the Special Equity Portfolio in 1994.
 
    Under Investment Advisory Agreements (the "Agreements") with the Fund, dated
as of September  27, 1989  and October  29, 1993,  the Adviser,  subject to  the
control and supervision of the Fund's Board of Directors and in conformance with
the  stated investment objectives and policies of the Sirach Portfolios, manages
the investment and reinvestment of the assets of the Sirach Portfolios. In  this
regard,  it is  the responsibility  of the Adviser  to manage  the Fund's Sirach
Portfolios and to place purchase and sales orders for the Sirach Portfolios.
 
    As  compensation  for  the  services  rendered  by  the  Adviser  under  the
Agreements,  each Sirach  Portfolio pays the  Adviser an annual  fee, in monthly
installments, calculated by  applying the following  annual percentage rates  to
each of the Sirach Portfolio's average daily net assets for the month:
 
<TABLE>
<CAPTION>
                                                                                                          RATE
                                                                                                       -----------
<S>                                                                                                    <C>
Sirach Strategic Balanced Portfolio..................................................................       0.65%
Sirach Growth Portfolio..............................................................................       0.65%
Sirach Fixed Income Portfolio........................................................................       0.65%
Sirach Short-Term Reserves Portfolio.................................................................       0.40%
Sirach Special Equity Portfolio......................................................................       0.70%
Sirach Equity Portfolio..............................................................................       0.65%
</TABLE>
 
    The  Adviser has voluntarily agreed to waive  a portion of its advisory fees
and to assume as the Adviser's own expense operating expenses otherwise  payable
by  the Portfolios, if necessary,  in order to reduce  expense ratios. As of the
date of this Prospectus, the Adviser has agreed to keep the Sirach Fixed Income,
the Sirach Short-Term  Reserves and the  Sirach Equity Portfolios  Institutional
Class  Shares from  exceeding 0.75%,  0.50% and  0.90% respectively,  of average
daily net assets. The Fund will not reimburse the Adviser for any advisory  fees
that  are waived or Portfolio expenses that the  Adviser may bear on behalf of a
Portfolio. In addition, the Adviser may compensate its affiliated companies  for
referring investors to the Portfolios. The Distributor, UAM, the Adviser, or any
of  their affiliates,  may, at  its own expense,  compensate a  Service Agent or
other person for marketing,  shareholder servicing, record-keeping and/or  other
services  performed with respect to the Fund, a Portfolio or any Class of Shares
of a Portfolio. The person making such  payments may do so out of its  revenues,
its profits or any other source available to it. Such service arrangements, when
in effect, are made generally available to all qualified service providers.
 
                                       21
<PAGE>
HISTORICAL PERFORMANCE
 
    Set  forth  below  are  certain performance  data  provided  by  the Adviser
relating to the composite  of equity accounts of  clients of the Adviser.  These
accounts  have the same investment objective as the Sirach Equity Portfolio, and
were managed  using substantially  similar, though  not in  all cases  identical
investment  strategies  and  techniques as  those  contemplated for  use  by the
Adviser in managing the Sirach Equity Portfolio. (See "Investment Objectives and
Policies.") The Results  presented are not  intended to predict  or suggest  the
returns  to  be experienced  by the  Sirach  Equity Portfolio  or the  return an
individual investor might achieve by  investing in the Sirach Equity  Portfolio.
Results  may  differ because  of, among  other  things, difference  in brokerage
commissions, account expenses, including investment  advisory fees, the size  of
positions  taken  in relation  to account  size, diversification  of securities,
timing of purchases  and sales,  availability of  cash for  new investments  and
private  character of the accounts compared with the Sirach Equity portfolio and
its shareholders.  Investors  should  be  aware  that  the  use  of  methods  of
determining performance different from that used below could result in different
performance  data. Investors should not rely  on the following performance date.
The performance data shown is that of the Adviser's private accounts and is  not
indicative of Sirach Equity Portfolio's future performance.
 
Total Annualized Return for Various Periods Ended December 31, 1995 (Unaudited)
 
<TABLE>
<CAPTION>
                                                                                      INSTITUTIONAL          S&P
                                                                                     EQUITY ACCOUNTS      500 INDEX
                                                                                    ------------------  -------------
<S>                                                                                 <C>                 <C>
One-year period...................................................................          35.2%             37.5%
Five-year period..................................................................          18.5%             16.6%
Ten-year period...................................................................          16.8%             14.8%
Fourteen-year period*.............................................................          19.9%             16.3%
</TABLE>
 
- ------------------------
*Inception of performance record
 
    1.    Sirach  Capital  Management,  Inc.  fully  adopted  the  Associate  of
       Investment Management and Research (AIMR) performance standards effective
       July 1, 1991.  Results prior to  April 1, 1989  were equal weighted.  The
       rates   of  return  were  calculated  using  a  quarterly  valuation  and
       geometrically linking of returns, as follows:
       The rate of  return for  each account was  the percentage  change in  the
       market value during the quarter, calculated monthly. This included earned
       income  for the quarter after allowing for the effect of any additions or
       withdrawals that might have occurred during the quarter. The formula used
       is in accordance with the acceptable methods set forth by AIMR (beginning
       July 1, 1991). Market value of each account was the sum of each account's
       total assets, including cash, cash equivalents, and securities valued  at
       current market prices, plus accrued income. To compute the annual rate of
       return  for each account, Sirach  Capital Management first determines the
       monthly rates, described above,  and then linked  the quarterly rates  of
       return.  To  compute the  rate  of return  for  more than  one  year, the
       quarterly rates of return were linked and then annualized.
 
    2.   Equity performance  results reflect  a blending  of 95%  of the  actual
       return from the equity only portion of Sirach Capital Management's Equity
       Composite  with 5% of the return of the Salomon Brothers 3 Month Treasury
       Bill rate.  Results are  based  on the  actual  performance of  an  asset
       weighted  composite of  fully discretionary,  non-restricted, unleveraged
       accounts. The composite totaled $1.519 billion as of 12/31/95.
 
    3.   The S&P  500 is  an unmanaged  index composite  of 400  industrial,  40
       financial,  40  utilities  and 20  transportation  stocks,  which assumes
       reinvestment of dividends and  is generally considered representative  of
       U.S. large capitalization stocks.
 
                            ADMINISTRATIVE SERVICES
 
    Pursuant  to a Fund Administration Agreement dated April 15, 1996, which was
approved by  the  Fund's Directors,  UAM  Fund Services,  Inc.,  a  wholly-owned
subsidiary  of UAM,  with its principal  office located at  211 Congress Street,
Boston, MA 02110, is responsible  for performing and overseeing  administration,
fund  accounting, dividend disbursing  and transfer agency  services provided to
the Fund and its Portfolios. The Fund pays UAM Fund Services, Inc. a monthly fee
for its services which on an annual basis  equals: 0.19 of 1% of the first  $200
million  of the aggregate  net assets of the  Fund; 0.11 of 1%  of the next $800
million of the aggregate net assets of the Fund; 0.07 of 1% of the aggregate net
assets in excess of $1 billion but less  than $3 billion; and 0.05 of 1% of  the
 
                                       22
<PAGE>
   
aggregate  assets in  excess of  $3 billion.  The fees  are allocated  among the
Portfolios on the basis of their relative assets and are subject to a  graduated
minimum  fee schedule  per Portfolio  of $1,250  per month  upon inception  of a
Portfolio to $70,000 annually after two years. If a separate class of shares  is
added  to a Portfolio, the minimum annual fee payable to UAM Fund Services, Inc.
by that Portfolio may be increased by up to $20,000. In addition, each Portfolio
will be pay to UAM Funds Services, Inc. a Fund-specific fee of between 0.02%  to
0.06% of the aggregate net assets of a Portfolio. The Directors of the Fund have
also  approved a Mutual Fund Service Agreement dated April 15, 1996, between UAM
Fund Services, Inc. and Chase Global Fund Services Company, an affiliate of  The
Chase  Manhattan  Bank,  N.A. under  which  Chase Global  Fund  Services Company
provides the Fund and its Portfolios  with certain services, including, but  not
limited  to,  fund accounting,  transfer  agency, maintenance  of  Fund records,
preparation of reports, assistance in the preparation of the Fund's registration
statement and general day to day administration of matters related to the Fund's
corporate existence. UAM Fund Services, Inc. pays Chase Global Funds Services  a
monthly fee for its services from the fees that UAM Fund Services, Inc. receives
from  the  Fund  under its  Fund  Administration Agreement.  Chase  Global Funds
Services Company  is  located  at  73 Tremont  Street,  Boston,  MA  02108-3913.
Effective  April 1,  1996, The  Chase Manhattan  Corporation, the  parent of The
Chase Manhattan Bank, N.A.  merged with and  into Chemical Banking  Corporation,
the  parent  company  of  Chemical Bank.  Chemical  Banking  Corporation  is the
surviving corporation and will continue its existence under the name "The  Chase
Manhattan Corporation".
    
 
                                  DISTRIBUTOR
 
    UAM  Fund Distributors,  Inc., a  wholly-owned subsidiary  of UAM,  with its
principal office located at 211  Congress Street, Boston, MA 02110,  distributes
the  shares of the Fund. Under the Distribution Agreement (the "Agreement"), the
Distributor, as  agent of  the Fund,  agrees to  use its  best efforts  as  sole
distributor  of the Fund's shares.  The Distributor does not  receive any fee or
other compensation under  the Agreement  with respect to  the Sirach  Portfolios
Institutional  Class Shares offered in  this Prospectus. The Agreement continues
in effect so  long as  such continuance  is approved  at least  annually by  the
Fund's  Board of Directors, including a majority  of those Directors who are not
parties to such Agreement or interested persons of any such party. The Agreement
provides that the Fund  will bear the  costs of the  registration of its  shares
with  the Commission  and various states  and the printing  of its prospectuses,
statements of additional information and reports to shareholders.
 
                             PORTFOLIO TRANSACTIONS
 
    The Investment  Advisory  Agreements authorize  the  Adviser to  select  the
brokers  or  dealers that  will execute  the purchases  and sales  of investment
securities for each of the Fund's  Sirach Portfolios and directs the Adviser  to
use  its best  efforts to  obtain the  best available  price and  most favorable
execution with  respect  to all  transactions  for the  Sirach  Portfolios.  The
Adviser  may, however, consistent  with the interests  of the Sirach Portfolios,
select brokers on the  basis of the research,  statistical and pricing  services
they  provide to the  Sirach Portfolios. Information  and research received from
such brokers will be in addition to,  and not in lieu of, the services  required
to  be  performed by  the Adviser  under the  Investment Advisory  Agreements. A
commission paid to such brokers may be higher than that which another  qualified
broker would have charged for effecting the same transaction, provided that such
commissions  are paid in compliance with the Securities Exchange Act of 1934, as
amended, and that the Adviser determines  in good faith that such commission  is
reasonable  in terms either of the  transaction or the overall responsibility of
the Adviser to the Sirach Portfolios and the Adviser's other clients.
 
    It is not  the Fund's  practice to  allocate brokerage  or effect  principal
transactions  with dealers  on the basis  of sales  of shares which  may be made
through broker-dealer firms.  However, the  Adviser may  place portfolio  orders
with qualified broker-dealers who refer clients to the Adviser.
 
    Some securities considered for investment by each of the Portfolios may also
be appropriate for other clients served by the Adviser. If a purchase or sale of
securities  is consistent with the investment policies of a Portfolio and one or
more of these other clients served by  the Adviser is considering a purchase  at
or  about the same time, transactions in such securities will be allocated among
the Portfolio and clients in a manner deemed fair and reasonable by the Adviser.
Although there is  no specified  formula for allocating  such transactions,  the
various  allocation  methods  used  by  the Adviser,  and  the  results  of such
allocations, are subject to periodic review by the Fund's Directors.
 
                                       23
<PAGE>
                              GENERAL INFORMATION
 
DESCRIPTION OF SHARES AND VOTING RIGHTS
 
    The Fund  was  organized under  the  name "ICM  Fund,  Inc." as  a  Maryland
corporation  on October 11, 1988. On January 18,  1989, the name of the Fund was
changed to "The Regis Fund, Inc." On October 31, 1995, the name of the Fund  was
changed  to "UAM Funds, Inc." The  Fund's Articles of Incorporation, as amended,
permit the Directors  to issue  three billion shares  of common  stock, with  an
$.001  par value. The Directors  have the power to  designate one or more series
("Portfolios") or  classes  of  shares  of  common  stock  and  to  classify  or
reclassify  any unissued shares with respect to such Portfolios, without further
action by shareholders. Currently the Fund is offering shares of 30  Portfolios.
The Board of Directors may create additional Portfolios and Classes of shares of
the Fund in the future at its discretion.
 
    The  shares  of each  Portfolio and  Class of  the Fund  are fully  paid and
nonassessable, and have  no preference  as to  conversion, exchange,  dividends,
retirement  or other features and have no pre-emptive rights. The shares of each
Portfolio and  Class have  non-cumulative voting  rights, which  means that  the
holders  of more than 50% of the shares voting for the election of Directors can
elect 100% of the Directors if they  choose to do so. A shareholder is  entitled
to  one vote for each full share held (and a fractional vote for each fractional
share held), then standing in his name on  the books of the Fund. As of  January
31,  1996,  the  South  Alaska  Carpenters  Defined  Contribution  Pension Plan,
Anchorage, AK,  held of  record 43%  of  the outstanding  shares of  the  Sirach
Short-Term  Reserves  Portfolio  Institutional  Class  Shares.  The  persons  or
organizations owning 25% or more of the outstanding shares of a Portfolio may be
presumed to "control" (as that term is defined in the 1940 Act) such  Portfolio.
As  a result, those  persons or organizations  could have the  ability to vote a
majority of the shares of the Portfolio on any matter requiring the approval  of
shareholders  of  such  Portfolio. Both  Institutional  Class  and Institutional
Service Class Shares represent an interest in the same assets of a Portfolio and
are identical in all respects except that the Service Class Shares bear  certain
expenses  related to  shareholder servicing,  may bear  expenses related  to the
distribution of such  shares and have  exclusive voting rights  with respect  to
matters  relating  to  such  distribution  expenditures.  Information  about the
Service Class  Shares  of the  Portfolios,  along  with the  fees  and  expenses
associated with such shares, is available upon request by contacting the Fund at
1-800-638-7983.  Annual meetings will not be held except as required by the 1940
Act and other applicable laws. The  Fund has undertaken that its Directors  will
call  a meeting of shareholders if such a meeting is requested in writing by the
holders of not  less than  10% of  the outstanding shares  of the  Fund. To  the
extent   required  by  the   undertaking,  the  Fund   will  assist  shareholder
communications in such matters.
 
CUSTODIAN
 
   
    The Chase Manhattan Bank serves as Custodian of the Fund's assets.
    
 
INDEPENDENT ACCOUNTANTS
 
    Price Waterhouse LLP serves as the independent accountants for the Fund  and
audits its financial statements annually.
 
REPORTS
 
    Shareholders  receive unaudited semi-annual  financial statements and annual
financial statements audited by Price Waterhouse LLP.
 
SHAREHOLDER INQUIRIES
 
    Shareholder inquiries may be made by writing  to the Fund at the address  on
the cover of this Prospectus or by calling 1-800-638-7983.
 
LITIGATION
 
    The Fund is not involved in any litigation.
 
                                       24
<PAGE>
                             DIRECTORS AND OFFICERS
 
    The   Officers  of  the  Fund  manage  its  day-to-day  operations  and  are
responsible to the Fund's Board of  Directors. The Directors set broad  policies
for  the Fund and choose its Officers. The  following is a list of the Directors
and Officers of the Fund  and a brief statement  of their present positions  and
principal occupations during the past five years.
 
   
<TABLE>
<S>                                   <C>
MARY RUDIE BARNEBY(*)                 Director   and  Executive  Vice  President  of  the  Fund;
1133 Avenue of the Americas           President of Regis Retirement  Plan Services, since  1993;
New York, NY 10036                    Former  President of UAM Fund Distributors, Inc.; Formerly
Age 43                                responsible for Defined  Contribution Plan  Services at  a
                                      division  of the Equitable  Companies, Dreyfus Corporation
                                      and Merrill Lynch.
 
JOHN T. BENNETT, JR.                  Director  of  the  Fund;  President  of  Squam  Investment
College Road - RFD3                   Management  Company,  Inc.  and  Great  Island  Investment
Meredith, NH 03253                    Company, Inc.;  President  of Bennett  Management  Company
Age 67                                from 1988 to 1993.
 
J. EDWARD DAY                         Director  of the  Fund; Retired Partner  in the Washington
5804 Brookside Drive                  office  of  the  law  firm  Squire,  Sanders  &   Dempsey;
Chevy Chase, MD 20815                 Director,  Medical Mutual  Liability Insurance  Society of
Age 81                                Maryland; Formerly,  Chairman  of The  Montgomery  County,
                                      Maryland, Revenue Authority.
 
PHILIP D. ENGLISH                     Director  of the  Fund; President  and 16  Chief Executive
West Madison Street                   Officer of Broventure Company, Inc.; Chairman of the Board
Baltimore, MD 21201                   of Chektec Corporation, and Cyber Scientific, Inc.
Age 47
 
WILLIAM A. HUMENUK                    Director of the Fund;  Partner in the Philadelphia  office
4000 Bell Atlantic Tower              of  the law firm Dechert  Price & Rhoads; Director, Hofler
1717 Arch Street                      Corp.
Philadelphia, PA 19103
Age 54
 
NORTON H. REAMER                      Director, President and Chairman  of the Fund;  President,
One International Place               Chief  Executive  Officer  and  Director  of  United Asset
Boston, MA 02110                      Management Corporation;  Director, Partner  or Trustee  of
Age 60                                each  of the Investment Companies of the Eaton Vance Group
                                      of Mutual Funds.
 
PETER M. WHITMAN, JR.(*)              Director of  the  Fund;  President  and  Chief  Investment
One Financial Center                  Officer  of  Dewey  Square  Investors  Corporation ("DSI")
Boston, MA 02111                      since 1988; Director  and Chief Executive  Officer of  H.T
Age 52                                Investors, Inc., formerly a subsidiary of DSI.
 
WILLIAM H. PARK(*)                    Vice  President of the Fund;  Executive Vice President and
One International Place               Chief  Financial  Officer   of  United  Asset   Management
Boston, MA 02110                      Corporation.
Age 49
 
GARY L. FRENCH(*)                     Treasurer  of  the  Fund;  President  and  Chief Executive
211 Congress Street                   Officer  of  UAM  Fund   Services,  Inc.;  formerly   Vice
Boston, MA 02110                      President-Operations  Development and  Control of Fidelity
Age 44                                Investment Institutional  Services from  February 1995  to
                                      August 1995; Treasurer of the Fidelity Group of Funds from
                                      1991 to February 1995.
 
MICHAEL E. DEFAO(*)                   Secretary  of the Fund; Vice President and General Counsel
211 Congress Street                   to UAM Fund Services, Inc.; formerly an Associate of Ropes
Boston, MA 02110                      & Gray (a law firm) from 1993 to November 1995.
Age 28
</TABLE>
    
 
                                       25
<PAGE>
<TABLE>
<S>                                   <C>
ROBERT R. FLAHERTY(*)                 Assistant Treasurer of  the Fund; Senior  Manager of  Fund
73 Tremont Street                     Administration  and Compliance  of Sub-Administrator since
Boston, MA 02108                      March 1995; formerly Senior  Manager of Deloitte &  Touche
Age 32                                LLP from 1985 to 1995.
 
KARL O. HARTMANN(*)                   Assistant Secretary of the Fund; Senior Vice President and
73 Tremont Street                     General Counsel of Sub-Administrator; formerly Senior Vice
Boston, MA 02108                      President,   Secretary  and  General  Counsel  of  Leland,
Age 41                                O'Brien, Rubinstein Associates, Inc. from November 1990 to
                                      November 1991.
</TABLE>
 
- ------------------------
*These people are deemed to be "interested persons" of the Fund as that term  is
 defined in the 1940 Act.
 
                                       26
<PAGE>
                    UAM FUNDS -- INSTITUTIONAL CLASS SHARES
 
ACADIAN ASSET MANAGEMENT, INC.
    Acadian Emerging Markets Portfolio
    Acadian International Equity Portfolio
 
BARROW, HANLEY, MEWHINNEY & STRAUSS, INC.
    BHM&S Total Return Bond Portfolio
 
CHICAGO ASSET MANAGEMENT COMPANY
    Chicago Asset Management Value/Contrarian Portfolio
    Chicago Asset Management Intermediate Bond Portfolio
 
COOKE & BIELER, INC.
    C&B Balanced Portfolio
    C&B Equity Portfolio
 
C.S. MCKEE & COMPANY, INC.
    McKee U.S. Government Portfolio
    McKee Domestic Equity Portfolio
    McKee International Equity Portfolio
 
DEWEY SQUARE INVESTORS CORPORATION
    DSI Disciplined Value Portfolio
    DSI Limited Maturity Bond Portfolio
    DSI Money Market Portfolio
 
FIDUCIARY MANAGEMENT ASSOCIATES, INC.
    FMA Small Company Portfolio
 
INVESTMENT COUNSELORS OF MARYLAND, INC.
    ICM Equity Portfolio
    ICM Fixed Income Portfolio
    ICM Small Company Portfolio
 
INVESTMENT RESEARCH COMPANY
    IRC Enhanced Index Portfolio
 
MURRAY JOHNSTONE INTERNATIONAL LTD.
    MJI International Equity Portfolio
 
NEWBOLD'S ASSET MANAGEMENT, INC.
    Newbold's Equity Portfolio
 
NWQ INVESTMENT MANAGEMENT COMPANY
    NWQ Balanced Portfolio
    NWQ Value Equity Portfolio
 
RICE, HALL JAMES & ASSOCIATES
    Rice, Hall James Small Cap Portfolio
 
SIRACH CAPITAL MANAGEMENT, INC.
    Sirach Fixed Income Portfolio
    Sirach Growth Portfolio
    Sirach Short-Term Reserves Portfolio
    Sirach Special Equity Portfolio
    Sirach Strategic Balanced Portfolio
    Sirach Equity Portfolio
 
SPECTRUM ASSET MANAGEMENT, INC.
    SAMI Preferred Stock Income Portfolio
    Enhanced Monthly Income Portfolio
 
                                       27
<PAGE>
STERLING CAPITAL MANAGEMENT COMPANY
    Sterling Partners' Balanced Portfolio
    Sterling Partners' Equity Portfolio
    Sterling Partners' Short-Term Fixed Income Portfolio
 
THOMPSON, STEGEL & WALMSLEY, INC.
    TS&W Equity Portfolio
    TS&W Fixed Income Portfolio
    TS&W International Equity Portfolio
 
                                       28
<PAGE>
                 (This page has been left blank intentionally.)
<PAGE>
                 (This page has been left blank intentionally.)
<PAGE>
                 (This page has been left blank intentionally.)
<PAGE>
                                   UAM FUNDS
 
                            UAM FUNDS SERVICE CENTER
                    C/O CHASE GLOBAL FUNDS SERVICES COMPANY
                                 P.O. BOX 2798
                             BOSTON, MA 02208-2798
                                 1-800-638-7983
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
   
                                   PROSPECTUS
          FEBRUARY 29, 1996 AS AMENDED JUNE 26, 1996 AND JULY 17, 1996
                               Investment Adviser
                        SIRACH CAPITAL MANAGEMENT, INC.
                             3323 One Union Square
                               Seattle, WA 98101
                                 (206) 624-3800
    
- --------------------------------------------------------------------------------
 
                                  Distributor
                          UAM FUND DISTRIBUTORS, INC.
                              211 Congress Street
                                Boston, MA 02110
 
                               TABLE OF CONTENTS
   
<TABLE>
<CAPTION>
                                                      PAGE
                                                    ---------
<S>                                                 <C>
Fund Expenses.....................................          2
Prospectus Summary................................          3
Financial Highlights..............................          5
Performance Calculations..........................          6
Investment Objectives.............................          7
Investment Policies...............................          7
Other Investment Policies.........................         10
Investment Limitations............................         14
Investment Suitability............................         15
Purchase of Shares................................         15
Redemption of Shares..............................         17
 
<CAPTION>
                                                      PAGE
                                                    ---------
<S>                                                 <C>
Shareholder Services..............................         18
Valuation of Shares...............................         19
Dividends, Capital Gains Distributions and
 Taxes............................................         19
Investment Adviser................................         20
Administrative Services...........................         22
Distributor.......................................         23
Portfolio Transactions............................         23
General Information...............................         24
Directors and Officers............................         25
UAM Funds -- Institutional Class Shares...........         27
</TABLE>
    
 
NO  PERSON  HAS  BEEN  AUTHORIZED  TO  GIVE  ANY  INFORMATION  OR  TO  MAKE  ANY
REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS, OR IN THE FUND'S STATEMENT  OF
ADDITIONAL  INFORMATION, 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 THE FUND. THIS PROSPECTUS DOES NOT CONSTITUTE
AN OFFERING BY  THE FUND  IN ANY  JURISDICTION IN  WHICH SUCH  OFFERING MAY  NOT
LAWFULLY BE MADE.
<PAGE>
                                   UAM FUNDS
                            UAM FUNDS SERVICE CENTER
                    C/O CHASE GLOBAL FUNDS SERVICES COMPANY
                                 P.O. BOX 2798
                             BOSTON, MA 02208-2798
                                 1-800-638-7983
 
- --------------------------------------------------------------------------------
 
                        SIRACH CAPITAL MANAGEMENT, INC.
             SERVES AS INVESTMENT ADVISER TO THE SIRACH PORTFOLIOS
                       INSTITUTIONAL SERVICE CLASS SHARES
- --------------------------------------------------------------------------------
 
   
  PROSPECTUS -- FEBRUARY 29, 1996, AS AMENDED JUNE 26, 1996 AND JULY 17, 1996
    
 
INVESTMENT OBJECTIVES
 
UAM  Funds, Inc. (herein defined  as "UAM Funds" or  the "Fund") is an open-end,
management investment  company, known  as a  "mutual fund"  and organized  as  a
Maryland  corporation. The Fund consists of  multiple series of shares (known as
"Portfolios"), each of which has different investment objectives and  investment
policies.  The  Sirach Strategic  Balanced,  Growth, Special  Equity  and Equity
Portfolios currently offer two separate  classes of shares: Institutional  Class
Shares  and Institutional Service Class  Shares ("Service Class Shares"). Shares
of each class  represent equal,  pro rata interests  in a  Portfolio and  accrue
dividends  in the same manner except that Service Class Shares bear fees payable
by the class  (at the  rate of  .25% per  annum) to  financial institutions  for
services  they  provide  to  the  owners  of  such  shares.  (See  "SERVICE  AND
DISTRIBUTION PLANS.") The securities  offered in this  Prospectus are shares  of
the  Service Class  of the  four diversified Portfolios  of the  Fund managed by
Sirach Capital Management, Inc.
 
SIRACH STRATEGIC  BALANCED PORTFOLIO.   The  objective of  the Sirach  Strategic
Balanced  Portfolio is  to provide long-term  growth of  capital consistent with
reasonable risk to principal by investing  in a diversified portfolio of  common
stocks and fixed income securities.
 
SIRACH  GROWTH PORTFOLIO.   The objective of  the Sirach Growth  Portfolio is to
provide long-term capital growth consistent with reasonable risk to principal by
investing primarily in common  stocks of companies  that offer long-term  growth
potential.
 
SIRACH  SPECIAL EQUITY  PORTFOLIO.  The  objective of the  Sirach Special Equity
Portfolio is  to provide  maximum long-term  growth of  capital consistent  with
reasonable  risk  to  principal, by  investing  in small  to  medium capitalized
companies with particularly attractive financial characteristics.
 
   
SIRACH EQUITY PORTFOLIO.   The objective  of the Sirach  Equity Portfolio is  to
provide long-term capital growth consistent with reasonable risk to principal by
investing,  under normal circumstances, up to 90%  of its total assets in common
stocks of companies that offer long-term growth potential.
    
 
    There can be no assurance  that any of the  Portfolios will meet its  stated
objective.
 
ABOUT THIS PROSPECTUS
 
   
This  Prospectus,  which should  be retained  for  future reference,  sets forth
concisely information that you  should know before you  invest. A "Statement  of
Additional  Information" containing  additional information  about the  Fund has
been filed with the Securities and Exchange Commission. Such Statement is  dated
February  29,  1996, as  amended June  26,  1996, and  has been  incorporated by
reference into this Prospectus. A copy of the Statement may be obtained, without
charge, by writing to the Fund or by calling the telephone number shown above.
    
 
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 OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
                        CONTRARY IS A CRIMINAL OFFENSE.
<PAGE>
                                 FUND EXPENSES
 
    The  following  table illustrates  expenses and  fees  that a  Service Class
shareholder of the Sirach Portfolios  will incur. However, transaction fees  may
be  charged  if  you  are  a customer  of  a  broker-dealer  or  other financial
intermediary who has established a  shareholder servicing relationship with  the
Fund  on behalf of their customers. Please  see "Purchase of Shares" for further
information.
 
                        SHAREHOLDER TRANSACTION EXPENSES
 
<TABLE>
<CAPTION>
                                                               SIRACH                  SIRACH
                                                              STRATEGIC    SIRACH      SPECIAL     SIRACH
                                                              BALANCED     GROWTH      EQUITY      EQUITY
                                                              PORTFOLIO   PORTFOLIO   PORTFOLIO   PORTFOLIO
                                                               SERVICE     SERVICE     SERVICE     SERVICE
                                                                CLASS       CLASS       CLASS       CLASS
                                                               SHARES      SHARES      SHARES      SHARES
                                                              ---------   ---------   ---------   ---------
<S>                                                           <C>         <C>         <C>         <C>
Sales Load Imposed on Purchases.............................      NONE        NONE        NONE        NONE
Sales Load Imposed on Reinvested Dividends..................      NONE        NONE        NONE        NONE
Deferred Sales Load.........................................      NONE        NONE        NONE        NONE
Redemption Fees.............................................      NONE        NONE        NONE        NONE
Exchange Fees...............................................      NONE        NONE        NONE        NONE
</TABLE>
 
                         ANNUAL FUND OPERATING EXPENSES
                    (AS A PERCENTAGE OF AVERAGE NET ASSETS)
 
   
<TABLE>
<CAPTION>
                                                               SIRACH                  SIRACH
                                                              STRATEGIC    SIRACH      SPECIAL     SIRACH
                                                              BALANCED     GROWTH      EQUITY      EQUITY
                                                              PORTFOLIO   PORTFOLIO   PORTFOLIO   PORTFOLIO
                                                               SERVICE     SERVICE     SERVICE     SERVICE
                                                                CLASS       CLASS       CLASS       CLASS
                                                               SHARES      SHARES      SHARES      SHARES
                                                              ---------   ---------   ---------   ---------
<S>                                                           <C>         <C>         <C>         <C>
Investment Advisory Fees....................................      0.65%       0.65%       0.70%       0.65%**
Administrative Fees.........................................      0.17%       0.15%       0.13%       0.16%
12b-1 Fees (Including Shareholder Servicing Fees)+..........      0.25%       0.25%       0.25%       0.25%
Other Expenses..............................................      0.09%       0.09%*      0.04%       0.22%**
                                                                   ---         ---         ---    ---------
Advisory Fees Waived........................................        --          --          --       (0.13%)
                                                                   ---         ---         ---    ---------
Total Operating Expenses....................................      1.16%*      1.14%*      1.12%       1.15%**
</TABLE>
    
 
- ------------------------------
   
 *The annualized  Total  Operating  Expenses  excludes  the  effect  of  expense
  offsets. If expense offsets were included, annualized Total Operating Expenses
  of  the Sirach Strategic  Balanced and Growth  Portfolios Service Class Shares
  would be  1.15%  and  1.11%,  respectively,  and  annualized  Total  Operating
  Expenses of the Sirach Special Equity Portfolio Service Class Shares would not
  differ significantly.
    
   
**The Adviser has voluntarily agreed to waive a portion of its advisory fees and
  to assume as the Adviser's own expense operating expenses otherwise payable by
  the  Sirach Equity Portfolio, if necessary, in order to reduce expense ratios.
  As of  the  date of  this  Prospectus, the  Adviser  has agreed  to  keep  the
  annualized  Total Operating Expenses  for the Sirach  Equity Portfolio Service
  Class Shares from exceeding 1.15% of its average net assets. The Fund will not
  reimburse the  Adviser for  any advisory  fees that  are waived  or  Portfolio
  expenses that the Adviser may bear on behalf of the Sirach Equity Portfolio.
    
 +The   Service  Class  Shares  may  bear   service  fees  of  0.25%.  Long-term
  shareholders may  pay  more  than  the  economic  equivalent  of  the  maximum
  front-end  sales charges  permitted by  rules of  the National  Association of
  Securities Dealers Inc. (See "SERVICE AND DISTRIBUTIONS PLANS.")
 
   
    The purpose of  this table is  to assist the  investor in understanding  the
various  expenses that  an investor  in the Service  Class Shares  of the Sirach
Portfolios of the Fund will bear  directly or indirectly. With the exception  of
the  Sirach Equity Portfolio, the expenses and fees set forth above are based on
the operations  of the  Sirach  Strategic Balanced,  Growth and  Special  Equity
Portfolios  Institutional Class Shares during the  fiscal year ended October 31,
1995 except that such  information has been restated  to reflect 12b-1 fees  and
revised  administrative  fees. The  expenses and  fees set  forth above  for the
Sirach Equity Portfolio are based on estimates. For purposes of the  calculating
the  fees set forth above, the table  assumes that the Sirach Equity Portfolio's
average daily assets will be $50  million. It is estimated that without  waiving
fees  and assuming  reimbursing expense  the Total  Operating Expenses  would be
1.25% of the average net assets.
    
 
                                       2
<PAGE>
    The following example illustrates the expenses that a shareholder would  pay
on  a $1,000 investment over various time  periods assuming (1) a 5% annual rate
of return and (2)  redemption at the end  of each time period.  As noted in  the
table above, the Portfolios charge no redemption fees of any kind.
 
   
<TABLE>
<CAPTION>
                                          1 YEAR  3 YEARS  5 YEARS  10 YEARS
                                          ------  -------  -------  --------
<S>                                       <C>     <C>      <C>      <C>
Sirach Strategic Balanced Portfolio
 Service Class Shares...................    $12     $ 37     $ 64     $ 142
Sirach Growth Portfolio Service Class
 Shares.................................    $12     $ 36     $ 63     $ 139
Sirach Special Equity Portfolio Service
 Class Shares...........................    $12     $ 36     $ 62     $ 137
Sirach Equity Portfolio Service Class
 Shares.................................    $12     $ 37
</TABLE>
    
 
    THESE  EXAMPLES SHOULD NOT BE CONSIDERED  A REPRESENTATION OF PAST OR FUTURE
EXPENSES OR PERFORMANCE.  ACTUAL EXPENSES MAY  BE GREATER OR  LESSER THAN  THOSE
SHOWN.
 
NOTE TO EXPENSE TABLE
 
    The  information set forth  in the table  and example above  relates only to
Service Class Shares which are subject to different total fees and expenses than
Institutional Class  Shares.  Service Agents  may  charge other  fees  to  their
customers  who are beneficial owners of  Service Class Shares in connection with
their customer accounts. (See "SERVICE AND DISTRIBUTION PLANS.")
 
                               PROSPECTUS SUMMARY
 
INVESTMENT OBJECTIVES AND POLICIES
 
    SIRACH STRATEGIC BALANCED PORTFOLIO.  The objective of the Sirach  Strategic
Balanced  Portfolio is  to provide long-term  growth of  capital consistent with
reasonable risk to principal by investing  in a diversified portfolio of  common
stocks and fixed income securities.
 
    SIRACH GROWTH PORTFOLIO.  The objective of the Sirach Growth Portfolio is to
provide long-term capital growth consistent with reasonable risk to principal by
investing  primarily in common  stocks of companies  that offer long-term growth
potential.
 
    SIRACH SPECIAL EQUITY PORTFOLIO.  The objective of the Sirach Special Equity
Portfolio is  to provide  maximum long-term  growth of  capital consistent  with
reasonable  risk  to  principal, by  investing  in small  to  medium capitalized
companies with particularly attractive financial characteristics.
 
   
    SIRACH EQUITY PORTFOLIO.  The objective of the Sirach Equity Portfolio is to
provide long-term capital growth consistent with reasonable risk to principal by
investing, under normal circumstances, up to  90% of its total assets in  common
stocks of companies that offer long-term growth potential.
    
 
INVESTMENT ADVISER
 
    Sirach  Capital Management,  Inc. (the "Adviser"),  an investment counseling
firm founded in 1970, serves as investment  adviser to six of the Fund's  Sirach
Portfolios.  The  Adviser  presently  manages over  $5.4  billion  in  funds for
institutional  clients  and  high   net  worth  individuals.  (See   "Investment
Adviser.")
 
PURCHASE OF SHARES
 
    Shares  of  each Portfolio  are offered,  through broker-dealers,  and other
financial institutions ("Service  Agents") at  net asset value  without a  sales
commission.  Share purchases may be made  by sending investments directly to the
Fund. The  minimum initial  investment  is $2,500.  The minimum  for  subsequent
investments  is $100. The  minimum initial investment for  401(k) plans is $500.
Certain exceptions to the initial or  minimum investment amounts may be made  by
the officers of the Fund. (See "Purchase of Shares.")
 
DIVIDENDS AND DISTRIBUTIONS
 
    Each  Portfolio  will  normally  distribute  substantially  all  of  its net
investment income in the form of quarterly dividends to each class. In addition,
each Portfolio will distribute  to each class any  unrealized net capital  gains
annually.  Distributions will be  reinvested in the same  Portfolio and class of
shares automatically unless  an investor elects  to receive cash  distributions.
(See "Dividends, Capital Gains Distributions and Taxes.")
 
REDEMPTIONS AND EXCHANGES
 
    Shares  may be redeemed at  any time, without cost,  at their respective net
asset value  next  determined  after  receipt of  the  redemption  request.  The
redemption  price may be more or less  than the purchase price. (See "Redemption
of Shares.")
 
                                       3
<PAGE>
ADMINISTRATIVE SERVICES
 
    UAM Fund Services, Inc., a  wholly-owned subsidiary of UAM Asset  Management
Corporation,  is responsible for performing  and overseeing administration, fund
accounting dividend disbursing and transfer agency services provided to the Fund
and its  Portfolios  by  third party  service  providers.  (See  "Administrative
Services.")
 
RISK FACTORS
 
    The  value of each Portfolio's shares  will fluctuate in response to changes
in market  and economic  conditions  as well  as  the financial  conditions  and
prospects  of the  issuers in which  a Portfolio  invests. Prospective investors
should consider  the  following  factors.  (1)  The  Sirach  Strategic  Balanced
Portfolio  may invest a  portion of its assets  in derivatives including futures
contracts and options.  (See "Futures  Contracts and Options.")  (2) The  Sirach
Special  Equity Portfolio invests  primarily in small  and medium capitalization
companies, some of which  may be foreign based.  (See "Investment Policies"  and
"Foreign  Investments.")  (3)  In general,  the  Portfolios will  not  trade for
short-term profits,  but when  circumstances warrant,  investments may  be  sold
without  regard to the length of time held. High rates of portfolio turnover may
result in additional  transaction costs  and the realization  of capital  gains.
(See  "Portfolio Turnover.")  (4) In  addition, each  Portfolio may  use various
investment practices that involve special considerations, including investing in
repurchase agreements,  when-issued,  forward delivery  and  delayed  settlement
securities and lending of securities. (See "Other Investment Policies.")
 
                            PERFORMANCE CALCULATIONS
 
    Each  Portfolio may advertise or quote  total return data. Total return will
be calculated  on  an  average  annual  total return  basis,  and  may  also  be
calculated  on an  aggregate total  return basis,  for various  periods. Average
annual total return reflects the average annual percentage change in value of an
investment in  the Portfolio  over a  measuring period.  Aggregate total  return
reflects  the total  percentage change  in value  over a  measuring period. Both
methods of  calculating total  return assume  that dividends  and capital  gains
distributions  made by a Portfolio during the period are reinvested in Portfolio
shares. Performance will  be calculated separately  for Institutional Class  and
Service   Class  Shares.  Dividends   paid  by  a   Portfolio  with  respect  to
Institutional Class and Service  Class Shares, to the  extent any dividends  are
paid, will be calculated in the same manner at the same time on the same day and
will  be in the same amount, except  that service fees, any distribution charges
and any incremental transfer agency costs relating to Service Class Shares  will
be borne exclusively by that class.
 
    The  Annual Report to the Shareholders of the Sirach Portfolios for the most
recent fiscal year end contains additional performance information that includes
comparisons with appropriate  indices. The  Annual Report  is available  without
charge  upon request to the Fund by writing  to the address or calling the phone
number on the cover of this Prospectus.
 
                             INVESTMENT OBJECTIVES
 
    SIRACH STRATEGIC BALANCED PORTFOLIO.  The objective of the Sirach  Strategic
Balanced  Portfolio  is  to  provide long-term  capital  growth  consistent with
reasonable risk to principal by investing  in a diversified portfolio of  common
stocks  of established companies  and investment grade  fixed income securities.
The proportion of  the Portfolio's  assets invested  in fixed  income or  common
stocks  will vary  as market  conditions warrant.  A typical  asset mix  for the
Portfolio, however, is  expected to be  50% common stocks  and 50% fixed  income
securities.   Cash  equivalent  investments  will   be  maintained  when  deemed
appropriate by the Adviser.
 
    SIRACH GROWTH PORTFOLIO.  The objective of the Sirach Growth Portfolio is to
provide long-term capital growth consistent with reasonable risk to principal by
investing in common stocks of companies that offer long-term growth potential.
 
    SIRACH SPECIAL EQUITY PORTFOLIO.  The objective of the Sirach Special Equity
Portfolio is  to provide  maximum long-term  growth of  capital consistent  with
reasonable risk to principal, by investing in small to medium capitalized growth
companies that have particularly strong financial characteristics as measured by
the Adviser's "ranking system."
 
   
    SIRACH EQUITY PORTFOLIO.  The objective of the Sirach Equity Portfolio is to
provide long-term capital growth consistent with reasonable risk to principal by
investing,  under normal circumstances, up to 90%  of its total assets in common
stocks of companies that offer  long-term growth potential. As described  below,
growth potential is measured by the Adviser's ranking system.
    
 
    There can be no assurance that any of the Portfolios will achieve its stated
objective.
 
                                       4
<PAGE>
                              INVESTMENT POLICIES
 
    SIRACH   STRATEGIC  BALANCED  PORTFOLIO.    The  Sirach  Strategic  Balanced
Portfolio is designed to provide a  single vehicle with which to participate  in
the  Adviser's equity and  fixed income strategies,  combined with the Adviser's
asset allocation  decisions. The  Portfolio seeks  to achieve  its objective  by
investing  in a combination of stocks,  bonds and short-term cash equivalents. A
typical asset mix of the Portfolio is expected to be 50% equities and 50%  fixed
income  securities. However, depending upon market conditions, the mix may vary,
and cash equivalent investments  will be maintained  when deemed appropriate  by
the  Adviser. Under  normal conditions,  the range  of exposure  to fixed income
securities is expected  to be  25% to  50% of the  Portfolio, and  the range  of
exposure  to equity securities is  expected to be 35%  to 70%. However, at least
25% of the  Portfolio's total  assets will always  be invested  in fixed  income
senior securities including debt securities and preferred stock.
 
    The  fixed income portion of the Portfolio will consist of a diversified mix
of investment  grade fixed  income securities  of varying  maturities  including
securities   of  the  U.S.   Government  and  its   agencies,  corporate  bonds,
mortgage-backed securities,  asset-backed  securities, and  various  short  term
instruments  such  as  commercial  paper,  Treasury  bills  and  certificates of
deposit.
 
    Investment grade bonds are generally considered to be those bonds having one
of the  four  highest  grades  assigned  by  Moody's  Investors  Services,  Inc.
("Moody's")  (Aaa, Aa,  A or  Baa ) or  Standard and  Poor's Corporation ("S&P")
(AAA, AA, A or BBB). Securities rated Baa  by Moody's or BBB by S&P may  possess
speculative  characteristics and may be more sensitive to changes in the economy
and the financial condition of issuers than higher rated bonds.  Mortgage-backed
securities  in which the Portfolio may invest will either carry a guarantee from
an agency of the U.S.  Government or a private issuer  of the timely payment  of
principal  and interest  or are  sufficiently seasoned  to be  considered by the
Adviser to be of investment grade quality.
 
    It is  the Adviser's  intention  that the  Portfolio's investments  will  be
limited  to the investment grades described above. However, the Adviser reserves
the right to retain securities which are downgraded by one or both of the rating
agencies if, in  the Adviser's  judgement, the  retention of  the securities  is
warranted.
 
    Credit  quality of bonds in such  ratings categories can change suddenly and
unexpectedly, and even recently-issued credit ratings may not fully reflect  the
actual  risks  posed by  a particular  security.  For these  reasons, it  is the
Portfolio's policy not to rely primarily on ratings issued by established credit
rating agencies, but to utilize such  ratings in conjunction with the  Adviser's
own independent and on-going review of credit quality.
 
    The  Adviser attempts to be risk  averse believing that preserving principal
in periods of rising  interest rates should lead  to above-average returns  over
the  long  run.  The fixed  income  portion  of the  Portfolio  will  be largely
determined by  the  Adviser's  assessment of  current  economic  conditions  and
trends,  the  Federal  Reserve  Board's management  of  monetary  policy, fiscal
policy, inflation expectations, government and private credit demands and global
conditions. Once  these  factors  have  been  carefully  analyzed,  the  average
maturity/duration  of the  Portfolio will be  adjusted to  reflect the Adviser's
outlook. Under  normal  market conditions,  the  weighted average  maturity  and
duration  will range  between eight  and twelve  years and  four and  six years,
respectively. Over a complete  market cycle, the  average maturity and  duration
will, on average, equal the general market.
 
    Additionally,  the  Adviser  attempts to  emphasize  relative  values within
selected maturity  ranges.  Interest  rate  spreads  between  different  quality
ranges,  by  types of  issues and  within  coupon areas  are monitored,  and the
Portfolio will be structured to take  advantage of relative values within  these
areas.  Marketability  of  individual  issues  and  diversification  within  the
Portfolio will be emphasized.
 
    Active security rotation will generate the majority of the excess returns in
the Portfolio. The Portfolio will hold,  under most circumstances, no more  than
10% of its assets in any non-governmental issue.
 
    While  the  Adviser  anticipates that  the  majority  of the  assets  in the
Portfolio  will  be  U.S.  dollar-denominated  securities,  up  to  20%  of  the
Portfolio's  assets may consist of obligations of foreign governments, agencies,
or corporations denominated either  in U.S. dollars  or foreign currencies.  The
credit  quality standards applied  to foreign obligations are  the same as those
applied to the selection of U.S.-based securities.
 
    Equity securities are selected using  approaches identical to those for  the
Sirach Growth Portfolio as set forth below.
 
    SIRACH  GROWTH PORTFOLIO.  The Sirach  Growth Portfolio seeks to achieve its
objective by investing in common stocks of companies that are small, medium  and
large  growth  companies  deemed  by  the  Adviser  to  offer  long-term  growth
potential. The  securities selected  will be  from a  universe of  approximately
2,500 companies listed on the
 
                                       5
<PAGE>
New  York  and  American Stock  Exchanges  and  on the  National  Association of
Securities Dealers Automated Quotation system ("NASDAQ"). The Portfolio may also
invest in convertible bonds or convertible preferred stocks.
 
    The Adviser's security  selection process  for the Portfolio  will focus  on
those  companies that rank high on the Adviser's proprietary ranking system. The
ranking system  consists of  five  buying tests  that  are ranked  according  to
decile.  The  Adviser believes  that companies  that  possess a  higher "ranking
score" are likely to provide superior rates of return over an extended period of
time relative to  the stock  market in general.  The components  of the  ranking
system  include  past earnings  per share  growth rates,  earnings acceleration,
prospective earnings "surprise" probabilities, relative price strength, and cash
reinvestment rates.  The  Adviser  screens a  universe  of  approximately  2,500
companies  to identify potentially attractive  securities. The list of potential
investments is narrowed further by  the use of traditional fundamental  security
analysis.  The  Adviser focuses  particular attention  on those  companies whose
recent earnings have exceeded consensus expectations.
 
   
    As perceived risks in  the marketplace increase, cash  reserves can be  used
for  defensive purposes. Under normal circumstances, it is anticipated that cash
reserves will represent a relatively small percentage of the Portfolio's  assets
(less  than 20%). For temporary defensive purposes, the Portfolio may reduce its
holdings  of  equity  securities  and   increase  its  holdings  in   short-term
investments. (See "Other Investment Policies - Short-Term Investments.")
    
 
    The  Adviser  anticipates  that  the  majority  of  the  investments  in the
Portfolio will be in United States based companies. However, from time to  time,
shares  of foreign based companies may be  purchased, if they pass the selection
process outlined above.  The Portfolio may  invest up  to 20% of  its assets  in
shares  of foreign based companies. In addition,  if shares of a foreign company
are purchased, they must  be traded in the  United States as sponsored  American
Depositary  Receipts ("ADRs")  which are  U.S. domestic  securities representing
ownership rights in  foreign companies.  (See "FOREIGN INVESTMENTS"  for a  more
detailed description of the risks involved.)
 
    SIRACH  SPECIAL  EQUITY  PORTFOLIO.   The  Portfolio  seeks  to  achieve its
objective by investing primarily in the  common stocks of companies with  market
capitalizations  of $100 million to $2  billion dollars. Securities selected for
the Portfolio will be chosen from the New York Stock Exchange and American Stock
Exchange or  from  the  over  the  counter  markets  operated  by  the  National
Association of Securities Dealers.
 
   
    The  security selection process for the Portfolio focuses on those companies
within the market capitalization specified above and that rank above average  on
the  Adviser's proprietary  "ranking system."  The "ranking  system" consists of
five buying tests that are ranked according to decile. The Adviser believes that
companies with smaller capitalizations that possess a higher "ranking score" are
likely to  provide superior  rates of  return over  an extended  period of  time
relative  to the stock market  in general. The components  of the ranking system
include past earnings per share growth rates, earnings acceleration, prospective
earnings,  "surprise"   probabilities,  relative   price  strength,   and   cash
reinvestment  rates. The Adviser screens a  universe of several thousand smaller
to medium capitalized companies  to identify potentially attractive  securities.
The  list of potential investments is narrowed further by the use of traditional
fundamental security  analysis.  In  addition, the  Adviser  focuses  particular
attention  on those  companies whose  earnings momentum  are accelerating and/or
whose recent earnings have exceeded the Adviser's expectations.
    
 
    It is  anticipated that  cash  reserves will  represent a  relatively  small
percentage of the Portfolio's assets (less than 20% under normal circumstances.)
For temporary defensive purposes, however, the Portfolio may reduce its holdings
of  equity  securities and  increase,  up to  100%,  its holdings  in short-term
investments.
 
    The Adviser  anticipates  that  the  majority  of  the  investments  in  the
Portfolio  will be in United States based companies. However, from time to time,
shares of foreign based  companies may be purchased  if they pass the  selection
process  outlined  above.  In  addition,  if shares  of  a  foreign  company are
purchased, they  must be  traded in  the United  States as  American  Depositary
Receipts  ("ADRs"), which  are U.S.  domestic securities  representing ownership
rights in foreign companies. Under normal circumstances, ADRs will not  comprise
more  than 20% of the Portfolio's assets.  (See "Foreign Investments" for a more
detailed description of the risks involved.)
 
    SIRACH EQUITY PORTFOLIO.   The Portfolio seeks to  achieve its objective  by
investing  primarily in  common stocks of  companies that are  small, medium and
large  capitalization  companies  deemed  by  the  Adviser  to  offer  long-term
potential.
 
                                       6
<PAGE>
    The  security  selection  process  for the  Portfolio  will  focus  on those
companies that  rank  high on  the  Adviser's proprietary  ranking  system.  The
ranking  system  consists of  five  buying tests  that  are ranked  according to
decile. The  Adviser believes  that  companies that  possess a  higher  "ranking
score" are likely to provide superior rates of return over an extended period of
time  relative to  the stock  market in general.  The components  of the ranking
system include  past earnings  per share  growth rates,  earnings  acceleration,
prospective  earnings "surprise" probabilities, relative price strength and cash
reinvestment rates.  The  Adviser  screens a  universe  of  approximately  2,500
companies  to identify potentially attractive  securities. The list of potential
investments is narrowed further by  the use of traditional fundamental  security
analysis.  The  Adviser focuses  particular attention  on those  companies whose
recent earnings have exceeded consensus expectations.
 
    In seeking to fulfill its investment objective, the Portfolio, under  normal
circumstances,  will invest  at least  90% of  its assets  in equity securities,
consisting primarily of common stock; however, the Portfolio may also invest  in
convertible  bonds or convertible  preferred stocks. The  Portfolio may invest a
portion of its  assets in  shares of  foreign based  companies. If  shares of  a
foreign  company are  purchased, they  must be  traded in  the United  States as
sponsored ADRs. (See "Foreign  Investments" for a  more detailed description  of
the risks involved.)
 
                           OTHER INVESTMENT POLICIES
 
SHORT-TERM INVESTMENTS
 
    There  may be periods when  economic or market conditions  are such that the
Adviser deems  a temporary  defensive position  to be  appropriate. During  such
periods, each Portfolio may adopt a temporary defensive posture in which greater
than  35% of its net assets are invested in the following instruments consistent
with each Portfolio's investment policies as set forth above.
 
    (1) Time deposits, certificates  of deposit  (including marketable  variable
        rate  certificates  of deposit)  and  bankers' acceptances  issued  by a
        commercial bank  or  savings and  loan  association. Time  deposits  are
        non-negotiable  deposits  maintained  in  a  banking  institution  for a
        specified period  of  time at  a  stated interest  rate.  Time  deposits
        maturing  in more than seven days will  not be purchased by a Portfolio,
        and time deposits maturing from two business days through seven calendar
        days will not exceed 10% of the total assets of a Portfolio.
 
        Certificates of deposit are negotiable short-term obligations issued  by
        commercial  banks  or savings  and  loan associations  collateralized by
        funds deposited in the  issuing institution. Variable rate  certificates
        of  deposit are  certificates of deposit  on which the  interest rate is
        periodically adjusted  prior  to  their stated  maturity  based  upon  a
        specified  market rate. A banker's acceptance is a time draft drawn on a
        commercial  bank  by   a  borrower,  usually   in  connection  with   an
        international  commercial  transaction (to  finance the  import, export,
        transfer or storage of goods).
 
        Each Portfolio will not  invest in any security  issued by a  commercial
        bank unless (i) the bank has total assets of at least $1 billion, or the
        equivalent  in other currencies, (ii) in the case of U.S. banks, it is a
        member of the Federal  Deposit Insurance Corporation,  and (iii) in  the
        case  of foreign branches of U.S. banks, the security is, in the opinion
        of the  Adviser, of  an investment  quality comparable  with other  debt
        securities which may be purchased by each Portfolio;
 
    (2) Commercial  paper  rated A-1  or A-2  by  S&P or  Prime-1 or  Prime-2 by
        Moody's or, if not rated, issued by a corporation having an  outstanding
        unsecured debt issue rated A or better by Moody's or by
 
    (3) Short-term  corporate obligations rated  BBB or better by  S&P or Baa or
        better by Moody's;
 
    (4) U.S. Government obligations including bills, notes, bonds and other debt
        securities issued by the U.S. Treasury. These are direct obligations  of
        the  U.S. Treasury, supported by the full faith and credit pledge of the
        U.S. Government  and differ  mainly in  interest rates,  maturities  and
        dates of issue;
 
    (5) U.S.   Government  agency  securities  issued   or  guaranteed  by  U.S.
        Government sponsored instrumentalities and Federal agencies.  Generally,
        such  securities are evaluated on  the creditworthiness of their issuing
        agency or guarantor  and are  not backed by  the direct  full faith  and
        credit pledge of the U.S. Government. These include securities issued by
        the   Federal  Home  Loan   Banks,  Federal  Land   Bank,  Farmers  Home
        Administration, Federal Farm Credit  Banks, Federal Intermediate  Credit
        Bank, Federal National Mortgage Association, Federal Financing Bank, the
        Tennessee Valley Authority, and others; and
 
    (6) Repurchase agreements collateralized by securities listed above.
 
                                       7
<PAGE>
   
    The Fund has received permission from the Securities and Exchange Commission
(the  "Commission") to deposit the daily  uninvested cash balances of the Fund's
Portfolios, as well  as cash  for investment purposes,  into one  or more  joint
accounts  and to invest the daily balance of the joint accounts in the following
short-term   investments:    fully   collateralized    repurchase    agreements,
interest-bearing  or  discounted commercial  paper  including dollar-denominated
commercial paper  of foreign  issuers,  and any  other short-term  money  market
instruments  including  variable rate  demand notes  and other  tax-exempt money
market instruments. By entering into these  investments on a joint basis, it  is
expected  that  a Portfolio  may earn  a  higher rate  of return  on investments
relative to what it could earn individually.
    
 
    The Fund has received a ruling from the Commission which allows each of  its
Portfolios  to invest the greater  of 5% of its total  assets or $2.5 million in
the Fund's  DSI  Money  Market  Portfolio for  cash  management  purposes.  (See
"Investment Companies.")
 
   
STRIPPED SECURITIES
    
 
   
    The  Sirach  Fixed Income  Portfolio  may invest  in  "stripped" securities.
Stripped securities are usually structured with two or more classes that receive
different proportions of the interest and  principal distributions on a pool  of
U.S.  Government mortgage or  asset-assets securities. In  some cases, one class
will receive all of the interest distributions (the interest-only class or  "IO"
class),  while the other  class will receive all  of the principal distributions
(the principal only or "PO" class). The  Portfolio does not intend to invest  in
IOs.  Stripped securities commonly  have greater volatility  than other types of
fixed income  securities.  Stripped  securities may  be  considered  derivatives
securities.
    
 
REPURCHASE AGREEMENTS
 
    Each  Portfolio may invest  in repurchase agreements  collateralized by U.S.
Government securities, certificates of deposit, and certain bankers' acceptances
and  other  securities  outlined  above  under  "Short-Term  Investments."   The
Portfolio  may  acquire repurchase  agreements as  long as  the Fund's  Board of
Directors evaluates the creditworthiness  of the brokers  or dealers with  which
each Portfolio will enter into repurchase agreements. In a repurchase agreement,
a  Portfolio  purchases a  security and  simultaneously  commits to  resell that
security at a future date to the seller (a qualified bank or securities  dealer)
at  an agreed  upon price plus  an agreed  upon market rate  of interest (itself
unrelated to the coupon rate or date of maturity of the purchased security). The
seller under a repurchase  agreement will be required  to maintain the value  of
the  securities subject  to the  agreement at not  less than  (1) the repurchase
price if  such securities  mature  in one  year  or less,  or  (2) 101%  of  the
repurchase  price  if  such  securities  mature  in  more  than  one  year.  The
Administrator and  the  Adviser will  mark  to market  daily  the value  of  the
securities  purchased, and the Adviser will, if necessary, require the seller to
maintain additional securities to  ensure that the value  is in compliance  with
the  previous  sentence. The  Adviser will  consider  the creditworthiness  of a
seller in  determining  whether  a  Portfolio should  enter  into  a  repurchase
agreement.
 
    In  effect, by entering into a  repurchase agreement, a Portfolio is lending
its funds  to the  seller at  the agreed  upon interest  rate, and  receiving  a
security  as collateral for  the loan. Such  agreements can be  entered into for
periods of one day (overnight repo) or for a fixed term (term repo).  Repurchase
agreements are a common way to earn interest income on short-term funds.
 
    The use of repurchase agreements involves certain risks. For example, if the
seller  of the agreement defaults on its obligation to repurchase the underlying
securities at  a  time  when the  value  of  these securities  has  declined,  a
Portfolio  may  incur a  loss upon  disposition of  them. If  the seller  of the
agreement becomes insolvent and subject  to liquidation or reorganization  under
the  Bankruptcy Code or  other laws, a  bankruptcy court may  determine that the
underlying securities are collateral not within  the control of a Portfolio  and
therefore  subject to sale by the trustee in bankruptcy. Finally, it is possible
that a Portfolio may not be able to substantiate its interest in the  underlying
securities. While the Fund's management acknowledges these risks, it is expected
that  they can be  controlled through stringent  security selection criteria and
careful monitoring procedures. Credit screens will be established and maintained
for dealers and dealer-banks before portfolio transactions are executed for each
Portfolio.
 
    The Fund has  applied to  the Commission for  permission to  pool the  daily
uninvested  cash  balances  of  the  Fund's Portfolios  in  order  to  invest in
repurchase agreements on a joint  basis. By entering into repurchase  agreements
on  a joint basis, it is expected that a Portfolio will incur lower transactions
costs and  potentially  obtain  higher  rates of  interest  on  such  repurchase
agreements.   Each  Portfolio's   participation  in  the   income  from  jointly
 
                                       8
<PAGE>
purchased repurchase agreements  will be  based on  that Portfolio's  percentage
share  in  the total  repurchase agreement.  While the  Fund expects  to receive
permission from the  Commission, there can  be no assurance  that the  requested
relief will be granted.
 
RESTRICTED SECURITIES
 
    Each  Portfolio may purchase  restricted securities that  are not registered
for sale to the general  public but which are  eligible for resale to  qualified
institutional investors under Rule 144A of the Securities Act of 1933. Under the
supervision  of  the  Fund's  Board of  Directors,  the  Adviser  determines the
liquidity of such investments by considering all relevant factors. Provided that
a dealer  or  institutional trading  market  in such  securities  exists,  these
restricted  securities are not treated as  illiquid securities for purposes of a
Portfolio's investment limitations. Each of the Portfolios may also invest up to
15% of its  net assets  (except the Sirach  Special Equity  Portfolio which  may
invest  up to 10% of its net assets)  in securities which are illiquid by virtue
of the absence of a readily available market or because of legal or  contractual
restrictions  on resale. The prices realized  from the sales of these securities
could be more or less than those  originally paid by the Portfolio or less  than
what may be considered the fair value of such securities.
 
LENDING OF SECURITIES
 
    Each Portfolio may lend its investment securities to qualified institutional
investors   who  need  to  borrow  securities   in  order  to  complete  certain
transactions, such  as  covering  short  sales,  avoiding  failures  to  deliver
securities  or  completing  arbitrage  operations.  A  Portfolio  will  not loan
portfolio securities to the extent that greater than one-third of its assets  at
fair  market  value, would  be  committed to  loans.  By lending  its investment
securities, a Portfolio attempts to increase  its income through the receipt  of
interest  on the loan.  Any gain or loss  in the market  price of the securities
loaned that might occur during the term of the loan would be for the account  of
the  Portfolio.  A Portfolio  may lend  its  investment securities  to qualified
brokers, dealers, domestic and foreign banks or other financial institutions, so
long as the terms, the structure and the aggregate amount of such loans are  not
inconsistent  with the  Investment Company Act  of 1940, as  amended, (the "1940
Act") or  the  Rules  and  Regulations  or  interpretations  of  the  Commission
thereunder,  which currently require  that (a) the  borrower pledge and maintain
with the  Portfolio collateral  consisting  of cash,  an irrevocable  letter  of
credit  issued by a domestic U.S. bank or securities issued or guaranteed by the
U.S. Government having a value at all times  not less than 100% of the value  of
the  securities loaned,  (b) the  borrower add  to such  collateral whenever the
price of the securities loaned rises  (i.e., the borrower "marks to the  market"
on  a daily basis), (c) the loan be made subject to termination by the Portfolio
at any time,  and (d)  the Portfolio receives  reasonable interest  on the  loan
(which  may  include the  Portfolio investing  any  cash collateral  in interest
bearing short-term investments). As with  other extensions of credit, there  are
risks  of delay in recovery  or even loss of rights  in the securities loaned if
the borrower of the securities fails financially. These risks are similar to the
ones involved with repurchase agreements as discussed above. All relevant  facts
and  circumstances,  including the  creditworthiness  of the  broker,  dealer or
institution, will be considered in making decisions with respect to the  lending
of securities, subject to review by the Fund's Board of Directors.
 
    At  the present  time, the  Staff of  the Commission  does not  object if an
investment company pays  reasonable negotiated  fees in  connection with  loaned
securities so long as such fees are set forth in a written contract and approved
by  the investment company's Board of  Directors. The Portfolio will continue to
retain any voting rights  with respect to the  loaned securities. If a  material
event  occurs affecting an investment on a loan, the loan must be called and the
securities voted.
 
PORTFOLIO TURNOVER
 
   
    Generally, the  Portfolios  will  not trade  in  securities  for  short-term
profits,  but, when circumstances warrant, securities may be sold without regard
to length of  time held.  It should  be understood  that the  rate of  portfolio
turnover  will depend  upon market and  other conditions,  and it will  not be a
limiting  factor  when   the  Adviser  believes   that  portfolio  changes   are
appropriate.  The portfolio turnover rate for the Sirach Equity Portfolio is not
anticipated to exceed 125%. A rate of turnover of 100% would occur, for example,
if all the securities held by a  Portfolio were replaced within a period of  one
year.  High rates  of portfolio  turnover necessarily  result in correspondingly
heavier brokerage and portfolio trading costs which are paid by the  Portfolios.
In  addition to Portfolio trading costs,  higher rates of portfolio turnover may
result in the realization of capital gains. To the extent net short-term capital
gains are realized, any distributions  resulting from such gains are  considered
ordinary  income for federal income tax purposes. (See "Dividends, Capital Gains
Distributions and Taxes" for more information on taxation.) The Portfolios  will
not normally engage in short-term trading, but each reserves the right to do so.
The   table  set  forth  in  "Financial  Highlights"  presents  the  Portfolios'
historical portfolio turnover ratios.
    
 
                                       9
<PAGE>
WHEN-ISSUED, FORWARD DELIVERY AND DELAYED SETTLEMENT SECURITIES
 
    Each Portfolio may purchase and sell securities on a "when-issued," "delayed
settlement," or "forward  delivery" basis. "When-issued"  or "forward  delivery"
refers  to securities whose terms  and indenture are available,  and for which a
market exists, but which are  not available for immediate delivery.  When-issued
or forward delivery transactions may be expected to occur a month or more before
delivery  is due. Delayed settlement is a  term used to describe settlement of a
securities transaction in the secondary market which will occur sometime in  the
future.  No payment or delivery is made by a Portfolio until it receives payment
or delivery  from the  other  party to  any of  the  above transactions.  It  is
possible  that the market price of the securities at the time of delivery may be
higher or lower than the purchase price. Each Portfolio will maintain a separate
account of cash, U.S. Government securities or other high-grade debt obligations
at least  equal to  the value  of purchase  commitments until  payment is  made.
Typically, no income accrues on securities purchased on a delayed delivery basis
prior  to the time delivery of the securities is made although the Portfolio may
earn income on securities it has deposited in a segregated account.
 
    Each Portfolio  may engage  in when-issued  transactions to  obtain what  is
considered to be an advantageous price and yield at the time of the transaction.
When  a Portfolio  engages in when-issued  or forward  delivery transactions, it
will do  so  for  the  purpose  of  acquiring  securities  consistent  with  its
investment  objective  and  policies  and not  for  the  purposes  of investment
leverage.
 
FOREIGN INVESTMENTS
 
    Investors should  recognize that  investing  in foreign  companies  involves
certain special considerations which are not typically associated with investing
in   U.S.  companies.  Since  the  stocks  of  foreign  companies  are  normally
denominated in foreign currencies,  the Portfolio may  be affected favorably  or
unfavorably  by changes in  currency rates and  in exchange control regulations,
and may incur costs in connection with conversions between various currencies.
 
    As non-U.S.  companies  are not  generally  subject to  uniform  accounting,
auditing  and financial  reporting standards  and practices  comparable to those
applicable to U.S. companies, there  may be less publicly available  information
about  certain foreign companies  than about U.S.  companies. Securities of some
non-U.S. companies  may be  less liquid  and more  volatile than  securities  of
comparable  U.S.  companies.  In  addition,  with  respect  to  certain  foreign
countries, there is the possibility  of expropriation or confiscatory  taxation,
political  or social instability, or  diplomatic developments which could affect
U.S. investments in those countries.
 
INVESTMENT COMPANIES
 
    As permitted by the 1940 Act, each Portfolio reserves the right to invest up
to 10%  of its  total  assets, calculated  at the  time  of investment,  in  the
securities of other open-end or closed-end investment companies. No more than 5%
of  the investing Portfolio's total assets may  be invested in the securities of
any one  investment company  nor  may it  acquire more  than  3% of  the  voting
securities  of any other investment company.  The Portfolio will indirectly bear
its proportionate share of any management fees paid by an investment company  in
which it invests in addition to the advisory fee paid by the Portfolio.
 
    The  Fund has received a ruling from the Commission which allows each of its
Portfolios to invest the greater  of 5% of its total  assets or $2.5 million  in
the Fund's DSI Money Market Portfolio for cash management purposes provided that
the  investment  is  consistent  with the  Portfolio's  investment  policies and
restrictions. Based upon the Portfolio's assets invested in the DSI Money Market
Portfolio, the investing Portfolio's adviser will waive its investment  advisory
fee  and any other fees earned as a  result of the Portfolio's investment in the
DSI Money Market Portfolio.  The investing Portfolio will  bear expenses of  the
DSI Money Market Portfolio on the same basis as all of its other shareholders.
 
    Except  as specified above and  as described under "Investment Limitations,"
the foregoing  investment policies  are not  fundamental and  the Directors  may
change  such  policies  without  an  affirmative  vote  of  a  "majority  of the
outstanding voting securities of a Portfolio," as defined in the 1940 Act.
 
                                       10
<PAGE>
                             INVESTMENT LIMITATIONS
 
    Each Portfolio  has  adopted  certain limitations  designed  to  reduce  its
exposure  to risk in specific  situations. Some of these  limitations are that a
Portfolio will not:
 
    (a) with respect to  75% of its  assets, invest  more than 5%  of its  total
        assets  at the time of  purchase in the securities  of any single issuer
        (other than  obligations  issued  or  guaranteed  as  to  principal  and
        interest  by  the  U.S.  Government  or  any  agency  or instrumentality
        thereof);
 
    (b) with respect to 75% of its assets,  purchase more than 10% of any  class
        of the outstanding voting securities of any issuer;
 
    (c) invest  more  than 5%  of  its assets  at the  time  of purchase  in the
        securities of  companies  that  have (with  predecessors)  a  continuous
        operating history of less than 3 years;
 
    (d) acquire  any securities of companies within one industry if, as a result
        of such acquisition, more than 25% of the value of the Portfolio's total
        assets  would  be  invested  in  securities  of  companies  within  such
        industry;  provided, however, that  there shall be  no limitation on the
        purchase of obligations issued or guaranteed by the U.S. Government, its
        agencies or instrumentalities, or instruments issued by U.S. banks  when
        a Portfolio adopts a temporary defensive position;
 
    (e) make  loans  except  (i)  by  purchasing  bonds,  debentures  or similar
        obligations  which  are  publicly  distributed,  (including   repurchase
        agreements  provided,  however, that  repurchase agreements  maturing in
        more than seven  days, together  with securities which  are not  readily
        marketable,  will not exceed  10% of the  Portfolio's total assets), and
        (ii) by lending its portfolio securities to banks, brokers, dealers  and
        other  financial institutions so long as such loans are not inconsistent
        with the 1940 Act or the Rules and Regulations or interpretations of the
        Commission thereunder;
 
    (f) (i)  borrow,  except  from  banks   and  as  a  temporary  measure   for
        extraordinary  or emergency purposes and then, in no event, in excess of
        33 1/3% (10% for the Sirach Special Equity Portfolio) of the Portfolio's
        gross assets valued at the lower of market or cost, and (ii) a Portfolio
        may not  purchase additional  securities when  borrowings exceed  5%  of
        total assets; or
 
    (g) pledge,  mortgage or hypothecate any of  its assets to an extent greater
        than 10% of its total assets at fair market value.
 
    The investment objectives of the Portfolios are fundamental and with respect
to each Portfolio  may be changed  only with the  approval of the  holders of  a
majority  of the  outstanding shares of  such Portfolio.  Except for limitations
(d), (e) and (f)(i),  the Sirach Strategic Balanced,  Sirach Growth, and  Sirach
Equity  Portfolios'  investment  limitations  and  policies  described  in  this
Prospectus and in the  Statement of Additional  Information are not  fundamental
and  may be changed by  the Fund's Board of  Directors upon reasonable notice to
investors. The investment  limitations of  the Sirach  Special Equity  Portfolio
described  here and in  the Statement of  Additional Information are fundamental
policies and may be changed only with the approval of the holders of a  majority
of  the  outstanding shares  of  the Portfolio.  If  a percentage  limitation on
investment or utilization of assets as set forth above is adhered to at the time
an investment is made,  a later change in  percentage resulting from changes  in
the  value or  total cost  of the  Portfolios' assets  will not  be considered a
violation of the restriction.
 
                             INVESTMENT SUITABILITY
 
    The Sirach  Portfolios  were designed  principally  for the  investments  of
institutional  investors. The  Sirach Strategic Balanced  Portfolio is available
for purchase by individuals and may be suitable for investors who seek long-term
growth of capital consistent with reasonable risk to principal by investing in a
diversified portfolio of common stocks  and fixed income securities. The  Sirach
Growth  Portfolio is available  for purchase by individuals  and may be suitable
for investors who seek long-term capital growth consistent with reasonable  risk
to  principal by  investing primarily in  common stocks of  companies that offer
long-term growth potential. The Sirach Special Equity Portfolio is available for
purchase by individuals and may be suitable for investors who seek maximum long-
term growth  of  capital  consistent  with  reasonable  risk  to  principal,  by
investing  in small to medium capitalized companies with particularly attractive
financial characteristics.  Although  no  mutual fund  can  guarantee  that  its
investment  objective will be met. The  Sirach Equity Portfolio is available for
purchase by  individuals and  may be  suitable for  investors who  seek  maximum
long-term  growth of  capital consistent  with reasonable  risk to  principal by
investing in  small to  large capitalized  companies with  attractive  long-term
growth potential.
 
                                       11
<PAGE>
                               PURCHASE OF SHARES
 
    Shares  of each  Portfolio and  Class may  be purchased  through any Service
Agent having selling or service agreements with UAM Fund Distributors, Inc. (the
"Distributor") without a sales commission,  at their respective net asset  value
per  share  next  determined after  an  order is  received  by the  Fund  or the
designated Service Agent. (See "SERVICE  AND DISTRIBUTION PLANS" and  "VALUATION
OF  SHARES.") The minimum initial investment required is $2,500 except that, for
401(k) plans the minimum initial investment  is $500. Certain exceptions may  be
made  from time to  time by the Officers  of the Fund.  The Portfolios issue two
classes of shares: Institutional Class and Institutional Service Class. The  two
classes of shares each represent interests in the same portfolio of investments,
have  the same rights and are identical in all respects, except that the Service
Class Shares offered by this Prospectus bear shareholder servicing expenses, may
in the future bear distribution plan expenses, and have exclusive voting  rights
with  respect  to  the  Rule  12b-1  Distribution  Plan  pursuant  to  which the
distribution  fee  may  be  paid.  The  two  classes  have  different   exchange
privileges.  (See "Exchange Privilege.") The  net income attributable to Service
Class Shares and the dividends payable  on Service Class Shares will be  reduced
by  the amount of the shareholder  servicing and distribution fees; accordingly,
the net asset value of the Service  Class Shares will be reduced by such  amount
to the extent the Portfolio has undistributed net income.
 
    Some  Service Agents may  also impose additional  or different conditions or
other account fees on the purchase and redemption of Portfolio shares, which are
not subject to the Rule 12b-1 Service and Distribution Plans, which may  include
transaction  fees and/or  service fees  paid by  the Fund  from the  Fund assets
attributable to the Service  Agent and, would  not be imposed  if shares of  the
Portfolio  were purchased directly from the Fund or the Distributor. The Service
Agents may  provide  shareholder  services  to  their  customers  that  are  not
available to a shareholder dealing directly with the Fund. Each Service Agent is
responsible  for transmitting to its  customers a schedule of  any such fees and
information regarding any additional or different conditions regarding purchases
and redemptions. Shareholders who are customers of Service Agents should consult
their Service  Agent for  information  regarding these  fees and  conditions.  A
salesperson and any other person entitled to receive compensation for selling or
servicing  Portfolio shares may  receive different compensation  with respect to
one particular class of shares over another in the Fund.
 
    If you buy shares of a Portfolio through a Service Agent, the Service  Agent
must  receive your investment order before the  close of trading on the New York
Stock Exchange ("NYSE"), generally 4:00 p.m.  (Eastern Time) and transmit it  to
the  Fund's Transfer Agent,  Chase Global Funds Services  Company, (prior to the
close of the Transfer Agent's business day) and the Distributor to receive  that
day's  offering price, with proper payment to the Fund to follow. Service Agents
are responsible to  their customers,  the Fund  and its  Distributor for  timely
transmission  of all  investment and  redemption information,  documentation and
money.
 
INITIAL INVESTMENTS BY MAIL
 
    An account also may be opened with  the assistance of your Service Agent  by
completing and signing an Account Registration Form, and forwarding it, together
with a check payable to UAM FUNDS, INC. through your Service Agent, to:
 
                                UAM Funds, Inc.
                            UAM Funds Service Center
                    c/o Chase Global Funds Services Company
                                 P.O. Box 2798
                             Boston, MA 02208-2798
 
    The  carbon copy (manually signed) of  the Account Registration Form must be
delivered to:
 
                          UAM Fund Distributors, Inc.
                              211 Congress Street
                                Boston, MA 02110
 
   
    Payment for the purchase of shares received by mail will be credited to your
account at the net asset value per share of the Portfolio next determined  after
receipt.  Such payment need not be converted into Federal Funds (monies credited
to the Fund's Custodian Bank by a Federal Reserve Bank) before acceptance by the
Fund.
    
 
INITIAL INVESTMENTS BY WIRE
 
    Shares may also be purchased by  wiring Federal Funds to the Custodian  Bank
(see  instructions below).  In order to  insure prompt crediting  of the Federal
Funds wire, it is important to follow these steps:
 
                                       12
<PAGE>
    (a) Your Service Agent should telephone the Fund's Transfer Agent (toll-free
        1-800-638-7983) and provide the account name, address, telephone number,
        social security  or  taxpayer identification  number,  the name  of  the
        Portfolio (Service Class Shares), the amount being wired and the name of
        the bank wiring the funds. (Investors with existing accounts should also
        notify  the Fund prior to wiring funds.)  An account number will then be
        provided to you;
 
   
    (b) Instruct your bank to wire the specified amount to the Custodian Bank;
    
 
   
                               The Chase Manhattan Bank
                                    ABA #021000021
                                       UAM Funds
                                Credit DDA #9102772952
                                  Ref: Portfolio Name
                              --------------------------
                               Your Account Registration
                              --------------------------
                                  Your Account Number
                              --------------------------
                                  Wire Control Number
    
                              --------------------------
 
    (c) A completed Account Registration Form must be forwarded to the Fund  and
        the  Distributor at  the addresses  shown thereon  as soon  as possible.
        Federal Funds purchases will be accepted only on a day on which the NYSE
        and the Custodian Bank are open for business.
 
ADDITIONAL INVESTMENTS
 
    You may add to  your account at any  time (minimum additional investment  is
$100)  by purchasing shares at net asset  value through your Service Agent or by
mailing a check to the Administrator (payable to "UAM Funds, Inc.") at the above
address or  by  wiring monies  to  the  Custodian Bank  using  the  instructions
outlined above. It is very important that your account number, account name, the
Portfolio,  and class of  shares to be  purchased are specified  on the check or
wire to insure proper crediting  to your account. In  order to insure that  your
wire  orders  are  invested  promptly,  you are  requested  to  notify  the Fund
(toll-free 1-800-638-7983) prior to the  wire date. Mail orders should  include,
when possible, the "Invest by Mail" stub which accompanies any Fund confirmation
statement.
 
OTHER PURCHASE INFORMATION
 
    Non-securities  dealer Service Agents may  receive transaction fees that are
the same as distribution fees paid to dealers.
 
    The Fund reserves the right, in its sole discretion, to suspend the offering
of shares of either Class  or Portfolio or reject  purchase orders when, in  the
judgement  of management, such suspension or  rejection is in the best interests
of the Fund.
 
    Purchases of  shares will  be made  in  full and  fractional shares  of  the
appropriate Class calculated to three decimal places. In the interest of economy
and  convenience,  certificates for  shares  will not  be  issued except  at the
written request of the shareholder. Certificates for fractional shares, however,
will not be issued.
 
IN-KIND PURCHASES
 
    If accepted by the Fund, shares may be purchased in exchange for  securities
which  are  eligible  for  acquisition  by  the  Portfolio  being  purchased, as
described in this Prospectus. Securities to  be exchanged which are accepted  by
the  Fund will be valued as set forth under "VALUATION OF SHARES" at the time of
the next determination of net asset  value after such acceptance. Shares  issued
in exchange for securities will be issued at relevant net asset value determined
as  of the  same time.  All dividends,  interest, subscription,  or other rights
pertaining to such  securities shall become  the property of  the Portfolio  and
must  be delivered  to the Fund  by the  investor upon receipt  from the issuer.
Securities acquired through an in-kind purchase will be acquired for  investment
and not for immediate resale.
 
    The  Fund will not accept  securities in exchange for  shares of a Portfolio
unless: (1) such securities  are, at the  time of the  exchange, eligible to  be
included  in the Portfolio  and current market  quotations are readily available
for such securities; (2) the investor represents and agrees that all  securities
offered  to be exchanged are liquid and are not subject to any restrictions upon
their sale by the Portfolio  under the Securities Act  of 1933, or liquidity  of
market;  and  (3)  the value  of  any  such securities  (except  U.S. Government
securities) being exchanged together  with other securities  of the same  issuer
owned  by the Portfolio  will not exceed 5%  of the net  assets of the Portfolio
immediately after the transaction.
 
                                       13
<PAGE>
    A gain or loss for Federal income tax purposes will be realized by investors
who are subject to Federal taxation upon the exchange depending upon the cost of
the securities  or  local  currency  exchanged.  Investors  interested  in  such
exchanges should contact the Adviser.
 
                              REDEMPTION OF SHARES
 
    Shares  may be redeemed by  mail or telephone at  any time, without cost, at
their net asset value next determined  after receipt of the redemption  request.
No  charge is made for redemptions. Any redemption  may be more or less than the
purchase price of your  shares depending on the  market value of the  investment
securities held by the relevant Portfolio.
 
BY MAIL
 
    Shares  will be redeemed  at the net  asset value next  determined after the
request is received in "good order". Your request should be addressed to:
 
                            UAM Funds Service Center
                    c/o Chase Global Funds Services Company
                                 P.O. Box 2798
                             Boston, MA 02208-2798
 
or to your Service Agent.
 
    "Good order"  means that  the  request to  redeem  shares must  include  the
following documentation:
 
    (a) The stock certificates, if issued;
 
    (b) A  letter of instruction or a  stock assignment specifying the number of
        shares or dollar amount to be redeemed, signed by all registered  owners
        of the shares in the exact names in which they are registered;
 
    (c) Any  required signature  guarantees (see  "SIGNATURE GUARANTEES" below);
        and
 
    (d) Other supporting legal documents, if  required, in the case of  estates,
        trusts,  guardianships, custodianships, corporations, pension and profit
        sharing plans and other organizations.
 
    Shareholders who are uncertain of requirements for redemption should contact
the UAM Funds Service Center.
 
SIGNATURE GUARANTEES
 
    To protect  your  account, the  Fund  and  the Transfer  Agent  from  fraud,
signature  guarantees are required for certain redemptions. Signature guarantees
are required for (1) redemptions  where the proceeds are  to be sent to  someone
other  than the registered shareowner(s) or the registered address, or (2) share
transfer requests. The purpose of signature guarantees is to verify the identity
of the party who has authorized a redemption.
 
    Signatures must  be guaranteed  by an  "eligible guarantor  institution"  as
defined  in Rule  17Ad-15 under  the Securities  Exchange Act  of 1934. Eligible
guarantor institutions include banks, brokers, dealers, credit unions,  national
securities  exchanges, registered securities associations, clearing agencies and
savings associations. A complete  definition of eligible guarantor  institutions
is  available from  the Transfer  Agent. Broker-dealers  guaranteeing signatures
must be a member of a clearing  corporation or maintain net capital of at  least
$100,000.  Credit  unions  must  be authorized  to  issue  signature guarantees.
Signatures guarantees will be accepted  from any eligible guarantor  institution
which participates in a signature guarantee program.
 
    The  signature guarantee must appear either:  (1) on the written request for
redemption; (2) on a  separate instrument for  assignment ("stock power")  which
should  specify the total number  of shares to be redeemed;  or (3) on all stock
certificates tendered for redemption  and, if shares held  by the Fund are  also
being redeemed, on the letter or stock power.
 
BY TELEPHONE
 
    Provided  you have previously established the telephone redemption privilege
by completing an Account Registration Form, you may request a redemption of your
shares by calling the Fund and  requesting the redemption proceeds be mailed  to
you  or wired to your  bank. The Fund and the  Fund's Transfer Agent will employ
reasonable procedures to confirm that instructions communicated by telephone are
genuine, and they  may be liable  for any losses  if they fail  to do so.  These
procedures   include  requiring   the  investor  to   provide  certain  personal
identification at the  time an  account is opened  and prior  to effecting  each
transaction requested by
 
                                       14
<PAGE>
telephone.  In addition, all telephone transaction requests will be recorded and
investors may be required to provide additional telecopied written  instructions
of  such transaction requests. Neither  the Fund nor the  Transfer Agent will be
responsible for any loss, liability, cost or expense for following  instructions
received by telephone that it reasonably believes to be genuine.
 
    To  change the  name of  the commercial  bank or  the account  designated to
receive redemption proceeds, a written request must  be sent to the Fund at  the
address  above. Requests to  change the bank  or account must  be signed by each
shareholder and each signature must be  guaranteed. You cannot redeem shares  by
telephone if you hold stock certificates for these shares. Please contact one of
the Fund's representatives at the Administrator for further details.
 
FURTHER REDEMPTION INFORMATION
 
    Normally,  the Fund  will make payment  for all shares  redeemed under these
procedures within one business day of receipt of the request in good order,  but
in  no  event will  payment be  made more  than  seven days  after receipt  of a
redemption request in good order. The  Fund may suspend the right of  redemption
or  postpone the date at times when both the NYSE and Custodian Bank are closed,
or under any emergency circumstances as determined by the Commission.
 
    If the Board  of Directors determines  that it would  be detrimental to  the
best  interests of the remaining shareholders of the Fund to make payment wholly
or partly in cash, the Fund may pay the redemption proceeds in whole or in  part
by  a distribution in-kind of  liquid securities held by  a Portfolio in lieu of
cash in conformity with applicable rules of the Commission. Investors may  incur
brokerage  charges on the sale of portfolio securities so received in payment of
redemptions.
 
                         SERVICE AND DISTRIBUTION PLANS
 
    Under the Service Plan  for Service Class Shares,  adopted pursuant to  Rule
12b-1  under  the 1940  Act, the  Fund  may enter  into service  agreements with
Service Agents (broker-dealers or other financial institutions) who receive fees
with respect to the Fund's Service  Class Shares owned by shareholders for  whom
the  Service Agent is  the dealer or holder  of record, or  for whom the Service
Agent performs  Servicing, as  defined below.  These fees  are paid  out of  the
assets  allocable to  Service Class  Shares to  the Distributor,  to the Service
Agent directly or through the  Distributor. The Fund reimburses the  Distributor
or the Service Agent, as the case may be, for payments made at an annual rate of
up to .25 of 1% of the average daily value of Service Class Shares of the Sirach
Portfolios owned by clients of such Service Agent during the period payments for
Servicing  are being  made to  it. Such  payments are  borne exclusively  by the
Service Class  Shares. Each  item for  which a  payment may  be made  under  the
Service Plan constitutes personal service and/or shareholder account maintenance
and  may constitute an expense of distributing  Fund Service Class Shares as the
Commission construes such term under Rule 12b-1. The fees payable for  Servicing
are payable without regard to actual expenses incurred, subject to adjustment of
the fee prospectively to reflect actual expenses.
 
    Servicing  may include,  among other  things, one  or more  of the following
rendered with respect to Service Class Shares or shareholders: answering  client
inquiries  regarding the Fund;  assisting clients in  changing dividend options,
account designations and addresses; performing sub-accounting; establishing  and
maintaining  shareholder accounts and record; processing purchase and redemption
transactions; investing client  cash account balances  automatically in  Service
Class  Shares; providing periodic statements  showing a client's account balance
and integrating such statements with those of other transactions and balances in
the client's other accounts  serviced by the Service  Agent; arranging for  bank
wires;  and  such other  services as  the Fund  may request,  to the  extent the
Service Agent is permitted by applicable statute, rule or regulation.
 
    The  Glass-Steagall  Act  and  other  applicable  laws  prohibit   Federally
chartered  or supervised banks from engaging  in certain aspects of the business
of issuing, underwriting, selling  and/or distributing securities.  Accordingly,
banks will be engaged to act as Service Agent only to perform administrative and
shareholder  servicing functions, including  transaction-related agency services
for their customers. If a bank  were prohibited from so acting, its  shareholder
clients would be permitted to remain Fund shareholders and alternative means for
continuing  the Servicing of such shareholders  would be sought. Banks and other
financial service institutions may  be subject to  various state laws  regarding
the  services  described  above, and  may  be  required to  register  as dealers
pursuant to state law.
 
    Banks and other  financial service  institutions may be  subject to  various
state  laws  regarding the  services  described above,  and  may be  required to
register as dealers pursuant to state law.
 
                                       15
<PAGE>
    The Distributor promotes the distribution of the Service Class Shares of the
Fund in accordance  with the terms  of a Distribution  Plan adopted pursuant  to
Rule  12b-1 under the  1940 Act. The  Distribution Plan provides  for the use of
Fund assets allocable to  Service Class Shares to  pay expenses of  distributing
such shares.
 
    The  Distribution Plan  and the  Service Plan  (together, the  "Plans") were
approved by the Board  of Directors, including a  majority of the directors  who
are not "interested persons" of the Fund as defined in the 1940 Act (and each of
whom  has no direct or indirect financial interest in the Plans or any agreement
related thereto, referred to herein as the "12b-1 Directors"). The Plans may  be
terminated  at any time by the  vote of the Board or  the 12b-1 Directors, or by
the vote of a majority of the outstanding voting securities of the Service Class
Shares.
 
    While the Plans continue in effect, the selection of the 12b-1 Directors  is
committed  to the discretion of  such persons then in  office. The Plans provide
generally that a Portfolio  may incur distribution and  service costs under  the
Plans  which may not exceed 0.75% per  annum of that Portfolio's net assets. The
Board has currently limited  payments under the  Plans to 0.50%  per annum of  a
Portfolio's  net assets.  The Service  Class Shares  offered by  this Prospectus
currently are  not  making  any  payments  under  the  Distribution  Plan.  Upon
implementation,  the Distribution Plan would permit payments to the Distributor,
broker-dealers, other  financial institutions,  sales representatives  or  other
third  parties who render promotional and  distribution services, for items such
as advertising  expenses, selling  expenses,  commissions or  travel  reasonably
intended  to result in sales  of shares of the Service  Class Shares and for the
printing of prospectuses  sent to  prospective purchasers of  the Service  Class
Shares of the Sirach Portfolios.
 
    Although  the Plans may be amended by  the Board of Directors, any change in
the Plans which  would materially  increase the  amounts authorized  to be  paid
under  the Plans  must be  approved by shareholders  of the  class involved. The
total amounts paid with respect  to a class of shares  of a Portfolio under  the
foregoing  arrangements may not  exceed the maximum  limits specified above, and
the amounts and purposes of expenditures under the Plans must be reported to the
12b-1 Directors quarterly. The amounts allowable under the Plans for each  Class
of Shares of the Portfolios are also limited under certain rules of the National
Association of Securities Dealers, Inc.
 
    In addition to payments by the Fund under the Plans, the Distributor, United
Asset  Management Corporation  ("UAM"), the parent  company of  the Adviser, the
Adviser, or  any of  their affiliates,  may, at  its own  expense, compensate  a
Service   Agent   or  other   person   for  marketing,   shareholder  servicing,
record-keeping and/or  other services  performed  with respect  to the  Fund,  a
Portfolio or any Class of Shares of a Portfolio. The person making such payments
may  do so out of its revenues, its profits or any other source available to it.
Such services arrangements, when in effect, are made generally available to  all
qualified service providers. The Adviser may compensate its affiliated companies
for referring investors to the Portfolios.
 
                              SHAREHOLDER SERVICES
 
EXCHANGE PRIVILEGE
 
    Service  Class Shares of each Sirach Portfolio  of the Fund may be exchanged
for Service Class Shares of any other Sirach Portfolio offering such shares.  In
addition, Service Class Shares of each Sirach Portfolio may be exchanged for any
other  Service Class Shares  of a Portfolio  included in the  UAM Funds which is
comprised of  the Fund  and UAM  Funds Trust.  (For those  Portfolios  currently
offering  Service  Class  Shares, please  call  the UAM  Funds  Service Center.)
Exchange requests should  be made  by calling  the Fund  (1-800-638-7983) or  by
writing  to UAM Funds, UAM Funds Service Center, c/o Chase Global Funds Services
Company, P.O. Box 2798,  Boston, MA 02208-2798. The  exchange privilege is  only
available  with  respect  to  Portfolios  that  are  registered  for  sale  in a
shareholder's state of residence.
 
    Any such exchange will be  based on the respective  net asset values of  the
shares  involved. There  is no  sales commission or  charge of  any kind. Before
making an exchange into  a Portfolio, a shareholder  should read its  Prospectus
and consider the investment objectives of the Portfolio to be purchased. You may
obtain  a Prospectus for the  Portfolio(s) you are interested  in by calling the
UAM Funds Service Center at 1-800-638-7983.
 
    Exchange requests may be made by mail, telephone or through a Service Agent.
Telephone exchanges will be accepted only if the certificates for the shares  to
be  exchanged are held  by the Fund for  the account of  the shareholder and the
registration of  the two  accounts  will be  identical. Requests  for  exchanges
received  prior to 4:00 p.m. (Eastern Time) will be processed as of the close of
business on the same day. Requests received after 4:00 p.m. will be processed on
the next  business  day.  Neither  the  Fund nor  the  Transfer  Agent  will  be
responsible  for  the  authenticity  of the  exchange  instructions  received by
telephone. Exchanges may also be subject to
 
                                       16
<PAGE>
limitations as to amounts or frequency and to other restrictions established  by
the  Board of Directors  to assure that  such exchanges do  not disadvantage the
Fund and its shareholders.  For additional information regarding  responsibility
for  the authenticity of telecopied instructions.  (See "Redemption of Shares by
Telephone" above.)
 
    For Federal income  tax purposes,  an exchange  between Funds  is a  taxable
event,  and accordingly, a  capital gain or  loss may be  realized. In a revenue
ruling relating  to circumstances  similar to  the Fund's,  an exchange  between
series of a Fund was also deemed to be a taxable event. It is likely, therefore,
that a capital gain or loss would be realized on an exchange between Portfolios.
You may want to consult your tax adviser for further information in this regard.
The exchange privilege may be modified or terminated at any time.
 
TRANSFER OF REGISTRATION
 
    You  may transfer  the registration  of any of  your Fund  shares to another
person by writing  to the  UAM Funds at  the above  address. As in  the case  of
redemptions,  the  written request  must be  received in  good order  before any
transfer can be made. (See "Redemption of Shares.")
 
                              VALUATION OF SHARES
 
    The net asset value of  each Class of shares  is determined by dividing  the
sum  of the total market value  the underlying Portfolio's investments and other
assets, less any liabilities, by the total outstanding shares of the Class.  The
net  asset value per share  of each Class of each  Portfolio is determined as of
the close of the NYSE on each day that the NYSE is open for business  (currently
4:00  p.m. Eastern Time). The net asset value of the Service Class Shares may be
lower than the net asset value of the Institutional Class Shares reflecting  the
daily expense accruals of the shareholder servicing fee and any distribution and
transfer agency fees applicable to the Service Class Shares.
 
    Equity   securities  listed  on  a  securities  exchange  for  which  market
quotations are readily available are valued at the last quoted sale price on the
day the valuation is made. Price information on listed securities is taken  from
the  exchange where the security is primarily traded. Unlisted equity securities
and listed  securities  not  traded  on the  valuation  date  for  which  market
quotations  are readily  available are  valued not  exceeding the  current asked
prices nor less than the current bid prices. For valuation purposes,  quotations
of  foreign  securities  in a  foreign  currency  are converted  to  U.S. dollar
equivalents based upon  the bid price  of such currencies  against U.S.  dollars
quoted by any major bank or by a broker.
 
    Bonds and other fixed income securities are valued according to the broadest
and  most representative market,  which will ordinarily  be the over-the-counter
market. Net asset values include interest  on fixed income securities, which  is
accrued daily.
 
    In  addition, bonds and other  fixed income securities may  be valued on the
basis of prices provided by a pricing  service when such prices are believed  to
reflect  the fair  market value  of such  securities. The  prices provided  by a
pricing service are determined  without regard to bid  or last sale prices,  but
take into account institutional size trading in similar groups of securities and
any  developments related to  the specific securities.  Securities not priced in
this manner are  valued at  the most  recent quoted  bid price,  or, when  stock
exchange  valuations are  used, at the  latest quoted  sale price on  the day of
valuation. If there is no such reported  sale, the latest quoted bid price  will
be used. Securities purchased with remaining maturities of 60 value days or less
are  valued  at  amortized cost  when  the  Board of  Directors  determines that
amortized cost reflects fair  value. In the event  that amortized cost does  not
approximate market, market prices as determined above will be used.
 
    The value of other assets and securities for which no quotations are readily
available  (including restricted securities) is determined in good faith at fair
value using methods determined by the Directors.
 
                DIVIDENDS, CAPITAL GAINS DISTRIBUTIONS AND TAXES
 
DIVIDENDS AND CAPITAL GAINS DISTRIBUTIONS
 
    Each Portfolio  will  normally  distribute  substantially  all  of  its  net
investment income to shareholders in the form of quarterly dividends. If any net
capital  gains are realized, each Portfolio  will normally distribute such gains
with the  last  dividend  for the  fiscal  year.  The per  share  dividends  and
distributions on Service Class Shares generally will be lower than the per share
dividends  and distributions  on Institutional Class  Shares as a  result of the
shareholder servicing, distribution and any  transfer agency fees applicable  to
the Service Class Shares.
 
                                       17
<PAGE>
    Undistributed  net investment income is included in a Portfolio's net assets
for the purpose  of calculating  net asset value  per share.  Therefore, on  the
"ex-dividend"  date, the net asset value  per share excludes the dividend (i.e.,
is reduced by  the per  share amount of  the dividend).  Dividends paid  shortly
after  the purchase  of shares by  an investor,  although in effect  a return of
capital, are taxable to shareholders.
 
    Each  Portfolio's  dividend   and  capital  gains   distributions  will   be
automatically  reinvested in additional shares of  the Portfolio unless the Fund
is notified in writing that the  shareholder elects to receive distributions  in
cash.
 
FEDERAL TAXES
 
    Each  Portfolio  intends to  qualify each  year  as a  "regulated investment
company" under the Internal Revenue Code  of 1986, as amended (the "Code"),  and
if  it qualifies, will not  be liable for Federal income  taxes to the extent it
distributes its net investment income and net realized capital gains. Dividends,
either in cash or reinvested in shares, paid by a Portfolio from net  investment
income  will be taxable to shareholders  as ordinary income. Dividends paid from
the Sirach Strategic Balanced, Sirach  Special Equity, Sirach Growth and  Sirach
Equity  Portfolios  will  generally  qualify  for  the  70%  dividends  received
deduction for corporations, but the portion  of the dividends so qualified  will
depend on the ratio of the aggregate taxable qualifying dividend income received
by  the Portfolio from domestic (U.S.)  sources to the Portfolio's total taxable
income, exclusive of long-term capital gains.
 
    Whether paid in cash or additional shares of the Portfolio and regardless of
the length  of  time  the  shares  in the  Portfolio  have  been  owned  by  the
shareholder,   distributions  from  long-term  capital   gains  are  taxable  to
shareholders as such, but are not eligible for the dividends received deduction.
Shareholders are  notified annually  by the  Fund as  to Federal  tax status  of
dividends   and  distributions   paid  by   a  Portfolio.   Such  dividends  and
distributions may also be subject to state and local taxes.
 
    Exchanges and redemptions of  shares in a Portfolio  are taxable events  for
Federal  income tax  purposes. A  shareholder may also  be subject  to state and
local taxes on such redemptions.
 
    Each Portfolio  intends  to  declare  and pay  dividend  and  capital  gains
distributions  so as to  avoid imposition of  the Federal Excise  Tax. To do so,
each Portfolio expects to distribute an amount equal to (1) 98% of its  calendar
year  ordinary income, (2)  98% of its  capital gains net  income (the excess of
short and long-term capital gains over  short and long-term capital losses)  for
the  one-year  period ending  October 31st,  and (3)  100% of  any undistributed
ordinary or capital gain net income  from the prior year. Dividends declared  in
December  will  be  deemed  to  have  been paid  by  the  Fund  and  received by
shareholders on the  record date  provided that  the dividends  are paid  before
February 1 of the following year.
 
    The  Fund is required by Federal law  to withhold 31% of reportable payments
(which may include dividends, capital gains distributions, and redemptions) paid
to  shareholders  who  have  not  complied  with  IRS  taxpayer   identification
regulations. In order to avoid this withholding requirement, you must certify on
the  Account Registration Form or  on a separate form  supplied by the Fund that
your Social Security or Taxpayer  Identification Number provided is correct  and
that you are not currently subject to backup withholding, or that you are exempt
from backup withholding.
 
STATE AND LOCAL TAXES
 
    Shareholders  may also be subject to  state and local taxes on distributions
from the Fund. Shareholders should consult with their tax advisers with  respect
to the tax status of distributions from the Fund in their state and locality.
 
                               INVESTMENT ADVISER
 
    The  investment adviser to the Sirach Portfolios, Sirach Capital Management,
Inc., is a Washington  corporation whose predecessor was  formed in 1970 and  is
located  at 3323 One Union  Square, Seattle, Washington 98101.  The Adviser is a
wholly-owned subsidiary  of United  Asset  Management Corporation  and  provides
investment  management  services  to  corporations,  pension  and profit-sharing
plans, 401(k)  and thrift  plans,  trusts, estates  and other  institutions  and
individuals.  As  of the  date of  this  Prospectus, the  Adviser had  over $5.4
billion in assets under  management. For further  information on Sirach  Capital
Management, Inc.'s investment services, please call (206) 624-3800.
 
    The  investment professionals of  the Adviser who  are primarily responsible
for the day-to-day  management of  the Sirach  Portfolios and  a description  of
their business experience during the past five years are as follows:
 
                                       18
<PAGE>
    SIRACH  STRATEGIC  BALANCED  PORTFOLIO  -- George  B.  Kauffman,  Stephen J.
Romano, and Robert L. Stephenson, Jr.;
 
    SIRACH GROWTH PORTFOLIO -- George B. Kauffman and Harvey G. Bateman; and
 
    SIRACH SPECIAL EQUITY PORTFOLIO - Harvey G. Bateman and Stefan W. Cobb.
 
    SIRACH EQUITY PORTFOLIO -- Harvey G. Bateman and George B. Kauffman
 
    HARVEY G. BATEMAN, CFA, CIC -- PRINCIPAL.  Mr. Bateman joined the Adviser in
1988. He  has managed  equity funds  for  the Adviser  since 1989.  Mr.  Bateman
assumed  responsibility for managing  the Special Equity  Portfolio in 1989, the
Growth Portfolio in 1995 and Equity Portfolio in 1996.
 
    GEORGE B. KAUFFMAN, CFA, CIC -- PRINCIPAL.  Mr. Kauffman joined the  Adviser
in  1981. He has managed  balanced and growth funds  for the Adviser since 1981.
Mr. Kauffman  assumed responsibility  for managing  the Strategic  Balanced  and
Growth Portfolios in 1993, and Equity Portfolio in 1996.
 
    ROBERT L. STEPHENSON, JR., CFA, CIC -- PRINCIPAL.  Mr. Stephenson joined the
Adviser  in 1987. He has managed balanced and growth funds for the Adviser since
1987. Mr. Stephenson assumed responsibility for managing the Strategic  Balanced
Portfolio in 1993.
 
    STEPHEN J. ROMANO, CFA -- PRINCIPAL.  Mr. Romano joined the Adviser in 1991.
Prior to that, he was a Senior Investment Officer at Seattle-First National Bank
where he managed equity and fixed income portfolios for private banking clients.
Mr. Romano has managed fixed income funds for the Adviser since 1991. He assumed
responsibility  for managing the fixed income  portion of the Strategic Balanced
Portfolio in 1993.
 
    STEFAN W. COBB -- PRINCIPAL.  Mr. Cobb joined the Adviser in 1994. Prior  to
that,  he was  a Vice  President at  the investment  banking firm  of Robertson,
Stephens & Company where he was engaged in institutional sales. Mr. Cobb assumed
responsibility for managing the Special Equity Portfolio in 1994.
 
    Under Investment Advisory  Agreements (the "Advisory  Agreements") with  the
Fund,  dated as of September 27, 1989 and October 29, 1993, the Adviser, subject
to the  control  and  supervision  of  the Fund's  Board  of  Directors  and  in
conformance  with the  stated investment objectives  and policies  of the Sirach
Portfolios, manages the investment and reinvestment of the assets of the  Sirach
Portfolios.  In this regard, it  is the responsibility of  the Adviser to manage
the Fund's Sirach  Portfolios and  to place purchase  and sales  orders for  the
Sirach Portfolios.
 
    As  compensation for the services rendered by the Adviser under the Advisory
Agreements, each Sirach  Portfolio pays the  Adviser an annual  fee, in  monthly
installments,  calculated by applying  the following annual  percentage rates to
each of the Sirach Portfolio's average daily net assets for the month:
 
<TABLE>
<CAPTION>
                                                                                                         RATE
                                                                                                      -----------
<S>                                                                                                   <C>
Sirach Strategic Balanced Portfolio.................................................................      0.650%
Sirach Growth Portfolio.............................................................................      0.650%
Sirach Special Equity Portfolio.....................................................................      0.700%
Sirach Equity Portfolio.............................................................................      0.650%
</TABLE>
 
    The Adviser has voluntarily agreed to  waive a portion of its advisory  fees
and  to assume as the Adviser's own expense operating expenses otherwise payable
by the Portfolios, if necessary,  in order to reduce  expense ratios. As of  the
date  of  this Prospectus,  the Adviser  has  agreed to  keep the  Sirach Equity
Portfolio Institutional Service  Class Shares from  exceeding 0.90%, of  average
daily  net assets. The Fund will not reimburse the Adviser for any advisory fees
that are waived or Portfolio expenses that  the Adviser may bear on behalf of  a
Portfolio.  In addition, the Adviser may compensate its affiliated companies for
referring investors to the Portfolios. The Distributor, UAM, the Adviser, or any
of their affiliates,  may, at  its own expense,  compensate a  Service Agent  or
other  person for marketing, shareholder  servicing, record-keeping and/or other
services performed with respect to the Fund, a Portfolio or any Class of  Shares
of  a Portfolio. The person making such payments  may do so out of its revenues,
its profits or any other source available to it. Such service arrangements, when
in effect, are made generally available to all qualified service providers.
 
HISTORICAL PERFORMANCE
 
    Set forth  below  are  certain  performance data  provided  by  the  Adviser
relating  to the composite of  equity accounts of clients  of the Adviser. These
accounts have the same investment objective as the Sirach Equity Portfolio,  and
were  managed using  substantially similar,  though not  in all  cases identical
investment strategies and
 
                                       19
<PAGE>
techniques as those contemplated for use  by the Adviser in managing the  Sirach
Equity  Portfolio.  (See  "Investment  Objectives  and  Policies".)  The Results
presented are not intended to predict  or suggest the returns to be  experienced
by  the  Sirach Equity  Portfolio  or the  return  an individual  investor might
achieve by investing in the Sirach Equity Portfolio. Results may differ  because
of,  among other things, difference  in brokerage commissions, account expenses,
including investment advisory fees, the size  of positions taken in relation  to
account  size,  diversification of  securities, timing  of purchases  and sales,
availability of cash for new investments  and private character of the  accounts
compared with the Sirach Equity portfolio and its shareholders. Investors should
be  aware that the use of methods of determining performance different from that
used below could result in different performance data. Investors should not rely
on the following  performance date. The  performance data shown  is that of  the
Adviser's  private accounts and  is not indicative  of Sirach Equity Portfolio's
future performance.
 
      Total Annualized Return for Various Periods Ended December 31, 1995
                                  (Unaudited)
 
<TABLE>
<CAPTION>
                                                                                      INSTITUTIONAL          S&P
                                                                                     EQUITY ACCOUNTS      500 INDEX
                                                                                    ------------------  -------------
<S>                                                                                 <C>                 <C>
One-year period...................................................................          35.2%             37.5%
Five-year period..................................................................          18.5%             16.6%
Ten-year period...................................................................          16.8%             14.8%
Fourteen-year period*.............................................................          19.9%             16.3%
</TABLE>
 
- ------------------------
*Inception of performance record
 
    1.    Sirach  Capital  Management,  Inc.  fully  adopted  the  Associate  of
       Investment Management and Research (AIMR) performance standards effective
       July  1, 1991. Results  prior to April  1, 1989 were  equal weighted. The
       rates  of  return  were  calculated  using  a  quarterly  valuation   and
       geometrically linking of returns, as follows:
       The  rate of  return for  each account was  the percentage  change in the
       market value during the quarter, calculated monthly. This included earned
       income for the quarter after allowing for the effect of any additions  or
       withdrawals that might have occurred during the quarter. The formula used
       is in accordance with the acceptable methods set forth by AIMR (beginning
       July 1, 1991). Market value of each account was the sum of each account's
       total  assets, including cash, cash equivalents, and securities valued at
       current market prices, plus accrued income. To compute the annual rate of
       return for each account, Sirach  Capital Management first determines  the
       monthly  rates, described above,  and then linked  the quarterly rates of
       return. To  compute  the rate  of  return for  more  than one  year,  the
       quarterly rates of return were linked and then annualized.
 
    2.   Equity  performance results  reflect a  blending of  95% of  the actual
       return from the equity only portion of Sirach Capital Management's Equity
       Composite with 5% of the return of the Salomon Brothers 3 Month  Treasury
       Bill  rate.  Results are  based  on the  actual  performance of  an asset
       weighted composite  of fully  discretionary, non-restricted,  unleveraged
       accounts. The composite totaled $1.519 billion as of 12/31/95.
 
    3.    The S&P  500 is  an unmanaged  index composite  of 400  industrial, 40
       financial, 40  utilities  and  20 transportation  stocks,  which  assumes
       reinvestment  of dividends and is  generally considered representative of
       U.S. large capitalization stocks.
 
                            ADMINISTRATIVE SERVICES
 
   
    Pursuant to a Fund Administration Agreement dated April 15, 1996, which  was
approved  by  the  Fund's Directors,  UAM  Fund Services,  Inc.,  a wholly-owned
subsidiary of UAM,  with its principal  office located at  211 Congress  Street,
Boston,  MA 02110, is responsible  for performing and overseeing administration,
fund accounting, dividend  disbursing and transfer  agency services provided  to
the Fund and its Portfolios. The Fund pays UAM Fund Services, Inc. a monthly fee
for  its services which on an annual basis  equals: 0.19 of 1% of the first $200
million of the aggregate  net assets of the  Fund; 0.11 of 1%  of the next  $800
million of the aggregate net assets of the Fund; 0.07 of 1% of the aggregate net
assets  in excess of $1 billion but less than  $3 billion; and 0.05 of 1% of the
aggregate assets  in excess  of $3  billion. The  fees are  allocated among  the
Portfolios  on the basis of their relative assets and are subject to a graduated
minimum fee  schedule per  Portfolio of  $1,250 per  month upon  inception of  a
Portfolio  to $70,000 annually after two years. If a separate class of shares is
added to a Portfolio, the minimum
    
 
                                       20
<PAGE>
annual fee payable to UAM Fund Services, Inc. by that Portfolio may be increased
by up to $20,000.  In addition, each  Portfolio will pay  to UAM Fund  Services,
Inc.  a Fund-specific fee of between 0.02%  to 0.06% of the aggregate net assets
of a Portfolio.  The Directors  of the  Fund have  also approved  a Mutual  Fund
Service  Agreement dated  April 15,  1996, between  UAM Fund  Services, Inc. and
Chase Global Fund Services  Company, an affiliate of  The Chase Manhattan  Bank,
N.A.  under which Chase Global  Fund Services Company provides  the Fund and its
Portfolios  with  certain  services,  including,   but  not  limited  to,   fund
accounting,  transfer  agency,  maintenance  of  Fund  records,  preparation  of
reports, assistance in the preparation of the Fund's registration statement  and
general  day to  day administration of  matters related to  the Fund's corporate
existence. UAM Fund Services,  Inc. pays Chase Global  Funds Services a  monthly
fee  for its services from  the fees that UAM  Fund Services, Inc. receives from
the Fund under its  Fund Administration Agreement.  Chase Global Funds  Services
Company  is located at 73 Tremont Street, Boston, MA 02108-3913. Effective April
1, 1996, The  Chase Manhattan  Corporation, the  parent of  The Chase  Manhattan
Bank, N.A. merged with and into Chemical Banking Corporation, the parent company
of  Chemical Bank. Chemical Banking Corporation is the surviving corporation and
will continue its existence under the name "The Chase Manhattan Corporation".
 
                                  DISTRIBUTOR
 
    UAM Fund  Distributors, Inc.,  a wholly-owned  subsidiary of  UAM, with  its
principal  office located at 211 Congress  Street, Boston, MA 02110, distributes
the  shares  of  the  Fund.   Under  the  Fund's  Distribution  Agreement   (the
"Agreement"),  the Distributor,  as agent  of the Fund,  agrees to  use its best
efforts as  sole distributor  of the  Fund's shares.  The Distributor  does  not
receive  any fee or other compensation  under the Agreement (except as described
under "Service and Distribution Plans" above). The Agreement continues in effect
so long as such continuance is approved at least annually by the Fund's Board of
Directors, including a majority of those  Directors who are not parties to  such
Agreement  or interested persons of any  such party. The Agreement provides that
the Fund  will  bear the  costs  of the  registration  of its  shares  with  the
Commission  and various states and the  printing of its prospectuses, statements
of additional information and reports to shareholders.
 
                             PORTFOLIO TRANSACTIONS
 
    The Advisory  Agreements authorize  the  Adviser to  select the  brokers  or
dealers  that will execute the purchases  and sales of investment securities for
each of the Fund's  Sirach Portfolios and  directs the Adviser  to use its  best
efforts  to obtain  the best available  price and most  favorable execution with
respect to all transactions for the Sirach Portfolios. The Adviser may, however,
consistent with the interests  of the Sirach Portfolios,  select brokers on  the
basis  of the  research, statistical  and pricing  services they  provide to the
Sirach Portfolios. Information and research  received from such brokers will  be
in addition to, and not in lieu of, the services required to be performed by the
Adviser  under the Advisory Agreement. A commission  paid to such brokers may be
higher than that which another qualified broker would have charged for effecting
the same transaction, provided that such commissions are paid in compliance with
the Securities Exchange Act of 1934, as amended, and that the Adviser determines
in good  faith  that  such commission  is  reasonable  in terms  either  of  the
transaction  or  the  overall  responsibility  of  the  Adviser  to  the  Sirach
Portfolios and the Adviser's other clients.
 
    It is not  the Fund's  practice to  allocate brokerage  or effect  principal
transactions  with dealers  on the basis  of sales  of shares which  may be made
through intermediary brokers or dealers that market shares of the Fund. However,
the Adviser may place portfolio  orders with qualified broker-dealers who  refer
clients to the Adviser.
 
    Some securities considered for investment by each of the Portfolios may also
be appropriate for other clients served by the Adviser. If a purchase or sale of
securities  is consistent with the investment policies of a Portfolio and one or
more of these other clients served by  the Adviser is considering a purchase  at
or  about the same time, transactions in such securities will be allocated among
the Portfolio and clients in a manner deemed fair and reasonable by the Adviser.
Although there is  no specified  formula for allocating  such transactions,  the
various  allocation  methods  used  by  the Adviser,  and  the  results  of such
allocations, are subject to periodic review by the Fund's Directors.
 
                              GENERAL INFORMATION
 
DESCRIPTION OF SHARES AND VOTING RIGHTS
 
    The Fund  was  organized under  the  name "ICM  Fund,  Inc." as  a  Maryland
corporation  on October 11, 1988. On January 18,  1989, the name of the Fund was
changed to "The Regis Fund, Inc." On October 31, 1995, the name of the Fund  was
changed  to "UAM Funds, Inc." The  Fund's Articles of Incorporation, as amended,
permit the
 
                                       21
<PAGE>
Directors to  issue three  billion shares  of common  stock, with  an $.001  par
value.   The  Directors  have  the  power   to  designate  one  or  more  series
("Portfolios") or  classes  of  shares  of  common  stock  and  to  classify  or
reclassify  any unissued shares with respect to such Portfolios, without further
action by shareholders. Currently, the Fund is offering shares of 30 Portfolios.
The Directors of the Fund may create additional Portfolios and Classes of shares
of the Fund in the future at their discretion.
 
    The shares  of each  Portfolio and  Class of  the Fund  are fully  paid  and
nonassessable,  and have  no preference  as to  conversion, exchange, dividends,
retirement or other features and have no pre-emptive rights. The shares of  each
Portfolio  and Class  have non-cumulative  voting rights,  which means  that the
holders of more than 50% of the shares voting for the election of Directors  can
elect  100% of the Directors if they choose  to do so. A shareholder is entitled
to one vote for each full share held (and a fractional vote for each  fractional
share  held),  then  standing  in  his  name on  the  books  of  the  Fund. Both
Institutional Class and Service Class Shares  represent an interest in the  same
assets  of a Portfolio and are identical in all respects except that the Service
Class Shares bear certain expenses related to shareholder servicing and may bear
expenses related to the distribution of  such shares, and have exclusive  voting
rights  with  respect to  matters  relating to  such  distribution expenditures.
Information about the  Service Class Shares  of the Portfolios,  along with  the
fees  and expenses  associated with  such shares,  is available  upon request by
contacting the Fund at 1-800-638-7983. Annual  meetings will not be held  except
as  required by the 1940 Act and  other applicable laws. The Fund has undertaken
that its Directors  will call a  meeting of  shareholders if such  a meeting  is
requested  in writing  by the holders  of not  less than 10%  of the outstanding
shares of the Fund.  To the extent  required by the  undertaking, the Fund  will
assist shareholder communications in such matters.
 
CUSTODIAN
 
   
    The Chase Manhattan Bank serves as Custodian of the Fund's assets.
    
 
INDEPENDENT ACCOUNTANTS
 
    Price  Waterhouse LLP serves as the independent accountants for the Fund and
audits its financial statements annually.
 
REPORTS
 
    Shareholders receive unaudited semi-annual  financial statements and  annual
financial statements audited by Price Waterhouse LLP.
 
SHAREHOLDER INQUIRIES
 
    Shareholder  inquiries may be made by writing  to the Fund at the address on
the cover of this Prospectus or by calling 1-800-638-7983.
 
LITIGATION
 
    The Fund is not involved in any litigation.
 
                                       22
<PAGE>
                             DIRECTORS AND OFFICERS
 
    The  Officers  of  the  Fund  manage  its  day-to-day  operations  and   are
responsible  to the Fund's Board of  Directors. The Directors set broad policies
for the Fund and choose its Officers.  The following is a list of the  Directors
and  Officers of the Fund  and a brief statement  of their present positions and
principal occupations during the past five years.
 
   
<TABLE>
<S>                                   <C>
MARY RUDIE BARNEBY(*)                 Director  and  Executive  Vice  President  of  the   Fund;
1133 Avenue of the Americas           President  of Regis Retirement  Plan Services, since 1993;
New York, NY 10036                    Former President of UAM Fund Distributors, Inc.;  Formerly
Age 43                                responsible  for Defined  Contribution Plan  Services at a
                                      division of the  Equitable Companies, Dreyfus  Corporation
                                      and Merrill Lynch.
 
JOHN T. BENNETT, JR.                  Director  of  the  Fund;  President  of  Squam  Investment
College Road - RFD3                   Management  Company,  Inc.  and  Great  Island  Investment
Meredith, NH 03253                    Company,  Inc.;  President of  Bennett  Management Company
Age 67                                from 1988 to 1993.
 
J. EDWARD DAY                         Director of the  Fund; Retired Partner  in the  Washington
5804 Brookside Drive                  office   of  the  law  firm  Squire,  Sanders  &  Dempsey;
Chevy Chase, MD 20815                 Director, Medical  Mutual Liability  Insurance Society  of
Age 81                                Maryland;  Formerly,  Chairman of  The  Montgomery County,
                                      Maryland, Revenue Authority.
 
PHILIP D. ENGLISH                     Director of  the Fund;  President and  16 Chief  Executive
West Madison Street                   Officer of Broventure Company, Inc.; Chairman of the Board
Baltimore, MD 21201                   of Chektec Corporation, and Cyber Scientific, Inc.
Age 47
 
WILLIAM A. HUMENUK                    Director  of the Fund; Partner  in the Philadelphia office
4000 Bell Atlantic Tower              of the law firm Dechert  Price & Rhoads; Director,  Hofler
1717 Arch Street                      Corp.
Philadelphia, PA 19103
Age 54
 
NORTON H. REAMER                      Director,  President and Chairman  of the Fund; President,
One International Place               Chief Executive  Officer  and  Director  of  United  Asset
Boston, MA 02110                      Management  Corporation; Director,  Partner or  Trustee of
Age 60                                each of the Investment Companies of the Eaton Vance  Group
                                      of Mutual Funds.
 
PETER M. WHITMAN, JR.(*)              Director  of  the  Fund;  President  and  Chief Investment
One Financial Center                  Officer of  Dewey  Square  Investors  Corporation  ("DSI")
Boston, MA 02111                      since  1988; Director  and Chief Executive  Officer of H.T
Age 52                                Investors, Inc., formerly a subsidiary of DSI.
 
WILLIAM H. PARK(*)                    Vice President of the  Fund; Executive Vice President  and
One International Place               Chief   Financial  Officer  of   United  Asset  Management
Boston, MA 02110                      Corporation.
Age 49
 
GARY L. FRENCH(*)                     Treasurer of  the  Fund;  President  and  Chief  Executive
211 Congress Street                   Officer   of  UAM  Fund   Services,  Inc.;  formerly  Vice
Boston, MA 02110                      President - Operations Development and Control of Fidelity
Age 44                                Investment Institutional  Services from  February 1995  to
                                      August 1995; Treasurer of the Fidelity Group of Funds from
                                      1991 to February 1995.
 
MICHAEL E. DEFAO(*)                   Secretary  of the Fund; Vice President and General Counsel
211 Congress Street                   to UAM Fund Services, Inc.; formerly an Associate of Ropes
Boston, MA 02110                      & Gray (a law firm) from 1993 to November 1995.
Age 28
</TABLE>
    
 
                                       23
<PAGE>
<TABLE>
<S>                                   <C>
ROBERT R. FLAHERTY(*)                 Assistant Treasurer of  the Fund; Senior  Manager of  Fund
73 Tremont Street                     Administration  and Compliance  of Sub-Administrator since
Boston, MA 02108                      March 1995; formerly Senior  Manager of Deloitte &  Touche
Age 32                                LLP from 1985 to 1995.
 
KARL O. HARTMANN(*)                   Assistant Secretary of the Fund; Senior Vice President and
73 Tremont Street                     General Counsel of Sub-Administrator; formerly Senior Vice
Boston, MA 02108                      President,   Secretary  and  General  Counsel  of  Leland,
Age 41                                O'Brien, Rubinstein Associates, Inc. from November 1990 to
                                      November 1991.
</TABLE>
 
- ------------------------
*These people are deemed to be "interested persons" of the Fund as that term  is
 defined in the 1940 Act.
 
                                       24
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                                   UAM FUNDS
 
                            UAM FUNDS SERVICE CENTER
                    C/O CHASE GLOBAL FUNDS SERVICES COMPANY
                                 P.O. BOX 2798
                             BOSTON, MA 02208-2798
                                 1-800-638-7983
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
   
                                   PROSPECTUS
          FEBRUARY 29, 1996 AS AMENDED JUNE 26, 1996 AND JULY 17, 1996
                               Investment Adviser
                        SIRACH CAPITAL MANAGEMENT, INC.
                             3323 One Union Square
                               Seattle, WA 98101
                                 (206) 624-3800
    
- --------------------------------------------------------------------------------
 
                                  Distributor
                          UAM FUND DISTRIBUTORS, INC.
                              211 Congress Street
                                Boston, MA 02110
 
                               TABLE OF CONTENTS
   
<TABLE>
<CAPTION>
                                                      PAGE
                                                    ---------
<S>                                                 <C>
Fund Expenses.....................................          2
Prospectus Summary................................          3
Performance Calculations..........................          4
Investment Objectives.............................          4
Investment Policies...............................          5
Other Investment Policies.........................          7
Investment Limitations............................         10
Investment Suitability............................         11
Purchase of Shares................................         11
Redemption of Shares..............................         14
 
<CAPTION>
                                                      PAGE
                                                    ---------
<S>                                                 <C>
 
Service and Distribution Plans....................         15
Shareholder Services..............................         16
Valuation of Shares...............................         17
Dividends, Capital Gains Distributions and
 Taxes............................................         17
Investment Adviser................................         18
Administrative Services...........................         20
Distributor.......................................         21
Portfolio Transactions............................         21
General Information...............................         21
Directors and Officers............................         23
</TABLE>
    
 
NO  PERSON  HAS  BEEN  AUTHORIZED  TO  GIVE  ANY  INFORMATION  OR  TO  MAKE  ANY
REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS, OR IN THE FUND'S STATEMENT  OF
ADDITIONAL  INFORMATION, 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 THE FUND. THIS PROSPECTUS DOES NOT CONSTITUTE
AN OFFERING BY  THE FUND  IN ANY  JURISDICTION IN  WHICH SUCH  OFFERING MAY  NOT
LAWFULLY BE MADE.


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