RBB FUND INC
497, 1995-02-21
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<PAGE>
                              WARBURG PINCUS FUNDS
 
                     SUPPLEMENT DATED FEBRUARY 21, 1995 TO
                       PROSPECTUS DATED DECEMBER 28 1994
 
     1.  The  following  sentence replaces  the  second sentence  of  the  third
paragraph under 'Prospectus' on page 1 of the Prospectus:
 
          It seeks  to  achieve this  objective  by diversified  investments  in
     common stocks, preferred stocks, debt securities, preferred stocks and debt
     securities  which  are  convertible  into  common  stocks,  and government,
     corporate, bank, and commercial obligations.
 
     2. The  following  sentence  replaces  the second  sentence  of  the  first
paragraph under 'BALANCED FUND' on page 9 of the Prospectus:
 
          The  Balanced Fund seeks to achieve this objective through a policy of
     diversified  investments   in  common   stocks,  preferred   stocks,   debt
     securities, preferred stocks and debt securities which are convertible into
     common stocks, and government, corporate, bank and commercial obligations.

<PAGE>
                                     [Logo]
 
                                               PROSPECTUS
 
                                            DECEMBER 28, 1994
                         [ ] WARBURG PINCUS GROWTH & INCOME FUND
 
                         [ ] WARBURG PINCUS BALANCED FUND 
<PAGE>
                      WARBURG PINCUS GROWTH & INCOME FUND
                          WARBURG PINCUS BALANCED FUND
 
PROSPECTUS                                                     December 28, 1994
 
The  WARBURG PINCUS GROWTH  & INCOME FUND  (the 'Growth &  Income Fund') and the
WARBURG PINCUS BALANCED FUND (the  'Balanced Fund') (collectively, the  'Funds')
consist  of multiple classes of common stock  of The RBB Fund, Inc. ('RBB'). RBB
is an open-end management investment company incorporated under the laws of  the
State  of Maryland on February 29, 1988  and currently operating or proposing to
operate nineteen  separate  investment portfolios.  The  shares of  the  classes
('Shares') offered by this Prospectus represent interests in the Funds.
 
The  Growth & Income Fund's investment  objective is to provide long-term growth
of capital and income and a reasonable current return. The Growth & Income  Fund
seeks to achieve its objectives by investing primarily in equity securities, and
in  various income producing  securities including, but  not limited to dividend
paying equity securities, fixed income securities and money market  instruments.
The Growth & Income Fund may also purchase without limitation dollar-denominated
American  Depository Receipts  ('ADRs'). ADRs are  issued by  domestic banks and
evidence ownership of underlying foreign securities.
 
The Balanced Fund's investment objective is  to maximize total return through  a
combination  of long-term growth  of capital and  current income consistent with
preservation of  capital. It  seeks  to achieve  this objective  by  diversified
investments in dividend-paying common stocks, preferred stocks, debt securities,
preferred  stocks and debt  securities which are  convertible into common stocks
and government, corporate, bank and commercial obligations. In implementing this
objective, this Balanced Fund will use a multi-manager approach.
 
Each Fund offers two  classes of shares.  A class of common  shares that is  'no
load'  ('No Load Shares') is available (a) directly from the Funds' distributor,
Counsellors Securities Inc., ('Counsellors Securities') and (b) through  various
brokerage   firms,  including  Charles  Schwab   &  Company,  Inc.  Mutual  Fund
OneSource'tm' Program  and Fidelity  Brokerage Services,  Inc.  FundsNetwork'tm'
Program.  See 'How to Purchase Shares.' No  Load Shares of the Balanced Fund are
subject to a 12b-1 fee of .25% per annum. No Load Shares of the Growth &  Income
Fund  are not subject to a 12b-1 fee.  The Series 2 Shares are available through
certain financial institutions  ('Service Organizations'). The  Series 2  Shares
are  subject to a 12b-1 fee of up to .75% per annum for services provided to the
beneficial owners of such  shares, which is the  economic equivalent of a  sales
charge.
 
SHARES  OF  THE FUNDS  ARE  NOT DEPOSITS  OR  OBLIGATIONS OF,  OR  GUARANTEED OR
ENDORSED BY ANY BANK AND SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT
INSURANCE  CORPORATION,  THE  FEDERAL  RESERVE  BOARD,  OR  ANY  OTHER   AGENCY.
INVESTMENTS  IN  SHARES  OF THE  FUND  INVOLVE INVESTMENT  RISKS,  INCLUDING THE
POSSIBLE LOSS OF PRINCIPAL.
 
This Prospectus contains information that  a prospective investor needs to  know
before investing. Please keep it for future reference. A Statement of Additional
Information,  dated December  28, 1994, has  been filed with  the Securities and
Exchange Commission and is incorporated by reference in this Prospectus. It  may
be obtained free of charge from RBB's distributor by calling (800) 257-5614.
 
- --------------------------------------------------------------------------------
THESE  SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
   EXCHANGE COMMISSION  OR  ANY STATE  SECURITIES  COMMISSION NOR  HAS  THE
     COMMISSION  OR  ANY  STATE  SECURITIES  COMMISSION  PASSED  UPON THE
       ACCURACY OR ADEQUACY OF  THIS PROSPECTUS. ANY REPRESENTATION  TO
                   THE  CONTRARY IS A  CRIMINAL  OFFENSE.
- --------------------------------------------------------------------------------
 
<PAGE>
FEE TABLE
SHAREHOLDER TRANSACTION EXPENSES*
ANNUAL FUND OPERATING EXPENSES AFTER EXPENSE REIMBURSEMENTS AND WAIVERS
<TABLE>
<CAPTION>
                                                                             GROWTH & INCOME
                                                                                  FUND               BALANCED FUND
                                                                           -------------------    -------------------
                                                                           NO LOAD    SERIES 2    NO LOAD    SERIES 2
                                                                           SHARES      SHARES     SHARES      SHARES
                                                                           -------    --------    -------    --------
 
<S>                                                                        <C>        <C>         <C>        <C>
Management fees (after waivers)**.......................................      .75%       .75%        .90%       .90%
12b-1 fees (after waivers)**............................................       --        .75         .25        .75
Other Expenses (after waivers and reimbursements).......................      .53        .53         .45        .45
                                                                           -------    --------    -------    --------
Total Fund Operating Expenses (after waivers and reimbursements)........     1.28%      2.03%       1.60%      2.10%
EXAMPLE
     An investor would pay the following expenses on a $1,000 investment
     in  each of  the Funds,  assuming (1) a  5% annual  return, and (2)
     redemption at the end of each time period:
 
<CAPTION>
 
                                                                             ONE       THREE       FIVE        TEN
                                                                            YEAR       YEARS       YEARS      YEARS
                                                                           -------    --------    -------    --------
<S>                                                                        <C>        <C>         <C>        <C>
 
     Growth & Income Fund
          No Load Shares................................................    $  13       $ 41       $  70       $155
          Series 2 Shares...............................................       21         64         109        236
     Balanced Fund
          No Load Shares................................................       16         51          87        190
          Series 2 Shares...............................................       21         66         113        243
</TABLE>
 
- ------------
 
 * No sales charge is imposed  upon the purchase of  shares of the Funds.  Thus,
   the  full amount of the purchase price of Fund shares will be invested at the
   time of purchase or upon any other exchange of Shares of other Warburg Pincus
   Funds without imposition of any sales charge.
 
** Management fees and 12b-1 fees are based on average daily net assets and  are
   calculated daily and paid monthly.
 
     The  caption 'Other  Expenses' does  not include  extraordinary expenses as
determined by use of generally accepted accounting principles.
 
     The Example in the Fee Table  assumes that all dividends and  distributions
are reinvested and that the amounts listed under 'Annual Fund Operating Expenses
After  Expense Reimbursements and  Waivers' remain the same  as the years shown.
Certain broker-dealers and financial institutions also may charge their  clients
fees  in connection  with investments  in a  Fund's shares,  which fees  are not
reflected in the table. THE EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF
PAST OR FUTURE EXPENSES AND  ACTUAL EXPENSES MAY BE  GREATER OR LESS THAN  THOSE
SHOWN.  Long-term Shareholders of both classes of the Balanced Fund and Series 2
Shares of the Growth & Income Fund may pay more than the economic equivalent  of
the  maximum front-end  sales charges permitted  by the  National Association of
Securities Dealers, Inc. (the 'NASD').
 
                                       2 
<PAGE>
     The  Fee  Table is  designed  to assist  an  investor in  understanding the
various costs and expenses that an investor in the Shares of the Funds will bear
directly or indirectly. (For more complete descriptions of the various costs and
expenses, see  'Management' and  'Distribution of  Shares' below.)  The  expense
figures  for the Growth & Income Fund are based upon fees and costs as of August
31, 1994. Expenses for the Balanced Fund have been restated from actual expenses
paid by such  Fund during  the year  ended August  31, 1994  to reflect  current
expense  levels. In addition,  the Fee Table reflects  a voluntary assumption of
some of the additional expenses of the Balanced Fund by the investment  adviser.
There  can be no assurance  that the investment adviser  will continue to assume
such expenses.  Assumption  of  additional  expenses will  have  the  effect  of
lowering  the Balanced Fund's overall expense ratios and increasing its yield to
investors. Absent such expense reimbursements, under current expense levels  the
actual  expenses paid by  the Balanced Fund  for the year  ended August 31, 1994
would have been as follows:
 
ANNUAL FUND OPERATING EXPENSES BEFORE EXPENSE REIMBURSEMENTS AND WAIVERS
 
<TABLE>
<CAPTION>
                                                                               BALANCED FUND
                                                                            -------------------
                                                                            NO LOAD    SERIES 2
                                                                            SHARES      SHARES
                                                                            -------    --------
 
<S>                                                                         <C>        <C>
Management fees..........................................................      .90%       .90%
12b-1 Fees...............................................................      .25        .75
Other Expenses...........................................................     4.76       4.76
                                                                            -------    --------
Total Fund Operating Expenses............................................     5.91%      6.41%
</TABLE>
 
     The caption 'Other  Expenses' does  not include  extraordinary expenses  as
determined by use of generally accepted accounting principles.
 
OFFERING PRICES
 
     Shares which represent interests in the Funds will be offered to the public
at  the next determined net asset value after  receipt of an order by the Funds.
See 'How to Purchase Shares.'
 
MINIMUM INITIAL AND SUBSEQUENT INVESTMENTS
 
     The  minimum  initial  investment  for  the  Funds  is  $1,000.  Subsequent
investments must be $100 or more. See 'How to Purchase Shares.'
 
EXCHANGES
 
     Shares  may be exchanged for Shares of  other Warburg Pincus Funds at their
net asset  value next  determined after  receipt  by the  Funds of  an  exchange
request.  However,  exchanges may  not be  effected between  No Load  Shares and
Series 2 Shares. No exchange fee is currently charged for exchanges. See 'How to
Redeem and Exchange Shares.'
 
REDEMPTION PRICE
 
     Shares may be redeemed at any time at their net asset value next determined
after receipt by Warburg Pincus Funds of a redemption request. The Funds reserve
the right, upon 30 days written notice, to redeem an account in the Funds if the
total value of the investor's Shares in that account falls below $500 and is not
increased to at least such amount within such 30-day period. See 'How to  Redeem
and Exchange Shares -- Redemption of Shares.'
 

RISK FACTORS
 
     An  investment  in the  Growth &  Income  or Balanced  Funds is  subject to
certain  risks,  as  set   
 
                                       3
 
<PAGE>
forth in detail under 'Investment Objectives and Policies.' As with other mutual
funds,  there  can  be  no assurance that any Fund  will achieve  its objective.
The Funds, to  the extent set forth under 'Investment Objectives and  Policies,'
may  engage  in  the  following  investment practices: the purchase of mortgage-
related  securities, the lending of portfolio securities and engaging in options
and futures transactions, engaging in secured borrowings and investing  in lower
rated  fixed-income  securities.  High  yield bonds are commonly referred  to as
'junk bonds.' All  of these transactions involve certain  special risks, as  set
forth under 'Investment Objectives and Policies.'
 
SHAREHOLDER INQUIRIES
 
     Any  questions or communications regarding  a shareholder account should be
directed to Warburg Pincus Funds at 1-800-888-6878 and direct communications  to
P.O. Box 9030 Boston, Massachusetts 02205-9030.
 
                                       4 
<PAGE>

FINANCIAL HIGHLIGHTS
 
     The  table below sets  forth certain information  concerning the investment
results of  the RBB  classes representing  interests in  No Load  Shares of  the
Warburg  Pincus Growth &  Income and Balanced Funds,  for the periods indicated.
The financial data included in this table for each of the years or periods ended
August 31, 1990 through 1994  are a part of  RBB's financial statements for  the
Funds  which have  been audited by  Coopers & Lybrand  L.L.P., RBB's independent
accountants, whose current report thereon appears in the Statement of Additional
Information along  with the  financial statements.  The financial  data for  the
Funds  for  the period  ended  August 31,  1989  is part  of  previous financial
statements audited by Coopers  & Lybrand L.L.P. Financial  data is not  provided
for  the Series 2 Shares as those shares  were not available to the public as of
August 31, 1994. The  financial data included  in this table  should be read  in
conjunction  with the  financial statements  and related  notes included  in the
Statement of Additional Information.
 
THE RBB FUND, INC. WARBURG PINCUS GROWTH & INCOME FUND(D)
(for a share outstanding throughout each period)
<TABLE>
<CAPTION>
                                           FOR THE YEAR        FOR THE YEAR        FOR THE YEAR        FOR THE YEAR
                                           ENDED AUGUST        ENDED AUGUST        ENDED AUGUST        ENDED AUGUST
                                             31, 1994            31, 1993            31, 1992            31, 1991
                                          ---------------     ---------------     ---------------     ---------------
 
<S>                                       <C>                 <C>                 <C>                 <C>
Net asset value, beginning of
 period...............................     $       16.72        $     11.99         $     12.11         $     11.00
                                          ---------------     ---------------     ---------------     ---------------
   Income From Investment Operations:
   Net investment income..............             0.785              .0464               .1912               .3744
   Net gains (losses) on securities
     (both realized and unrealized)...            1.8151             4.8499               .0402              1.6891
                                          ---------------     ---------------     ---------------     ---------------
   Total from investment operations...            1.8936             4.8963               .2314              2.0635
                                          ---------------     ---------------     ---------------     ---------------
   Less Distributions
   Dividends (from net investment
     income)..........................            (.0785)            (.0875)             (.1871)             (.4043)
   Distributions (from capital
     gains)...........................           (3.9751)            (.0788)             (.1643)             (.5492)
                                          ---------------     ---------------     ---------------     ---------------
   Total distributions................           (4.0536)            (.1663)             (.3514)             (.9535)
                                          ---------------     ---------------     ---------------     ---------------
Net asset value, end of period........     $       14.56        $     16.72         $     11.99         $     12.11
                                          ---------------     ---------------     ---------------     ---------------
                                          ---------------     ---------------     ---------------     ---------------
Total Returns.........................             14.41%             41.17%               1.99%              19.91%
Ratios/Supplemental Data:
   Net assets, end of period..........     $ 410,657,628        $60,689,379         $28,976,303         $24,725,586
   Ratios of expenses to average net
     assets...........................              1.28%(a)           1.14%(a)            1.25%(a)            1.30%(a)
   Ratios of net investment income to
     average net assets...............               .41%               .30%               1.66%               3.42%
Portfolio turnover rate...............               150%               344%                175%                 41%
 
<CAPTION>
                                                             FOR THE PERIOD
                                                             OCTOBER 6, 1988
                                         FOR THE YEAR         (COMMENCEMENT
                                         ENDED AUGUST       OF OPERATIONS) TO
                                           31, 1990          AUGUST 31, 1989
                                        ---------------     -----------------
<S>                                       <C>               <C>         
Net asset value, beginning of
 period...............................    $     11.53          $     10.00
                                        ---------------           --------
   Income From Investment Operations:
   Net investment income..............          .3574                .3876
   Net gains (losses) on securities
     (both realized and unrealized)...         (.1856)              1.4225
                                        ---------------           --------
   Total from investment operations...          .1718               1.8101
                                        ---------------           --------
   Less Distributions
   Dividends (from net investment
     income)..........................         (.3951)              (.2833)
   Distributions (from capital
     gains)...........................         (.3067)                  --
                                        ---------------           --------
   Total distributions................         (.7018)              (.2833)
                                        ---------------           --------
Net asset value, end of period........    $     11.00          $     11.53
                                        ---------------           --------
                                        ---------------           --------
Total Returns.........................           1.48%               18.48%(c)
Ratios/Supplemental Data:
   Net assets, end of period..........    $ 1,396,198          $ 1,150,440
   Ratios of expenses to average net
     assets...........................           1.40%(a)             1.40%(a)(b)
   Ratios of net investment income to
     average net assets...............           3.32%                4.32%(b)
Portfolio turnover rate...............             98%                 111%(c)
</TABLE>
 
- ------------
 
 (a) Without the  waiver of  advisory and  administration fees  and without  the
     reimbursement  of  certain operating  expenses, the  ratios of  expenses to
     average net assets for the Warburg  Pincus Growth & Income Fund would  have
     been  1.28%, 1.14%, 1.28%, 2.17%  and 3.81% for the  years ended August 31,
     1994, 1993, 1992, 1991 and 1990, respectively, and 2.82% annualized for the
     period ended August 31, 1989.
 
 (b) Annualized.
 
 (c) Not annualized.
 
 (d) Formerly the Equity Growth  & Income Portfolio. Prior  to October 1,  1993,
     the Fund was advised by PNC Institutional Management Corporation.
 
                                       5
 
<PAGE>
THE RBB FUND, INC. WARBURG PINCUS BALANCED FUND(E)
(for a share outstanding throughout each period)
<TABLE>
<CAPTION>
                                           FOR THE YEAR        FOR THE YEAR        FOR THE YEAR        FOR THE YEAR
                                           ENDED AUGUST        ENDED AUGUST        ENDED AUGUST        ENDED AUGUST
                                             31, 1994            31, 1993            31, 1992            31, 1991
                                          ---------------     ---------------     ---------------     ---------------
 
<S>                                       <C>                 <C>                 <C>                 <C>
Net asset value, beginning of
 period...............................       $   11.71           $   12.04          $     12.05         $     10.60
                                               -------             -------        ---------------     ---------------
   Income from Investment Operations
   Net investment income..............           .4132               .5555                .4408               .4213
   Net gains (losses) on securities
     (both realized and unrealized)...           .3248              1.1253                .5155              1.7196
                                               -------             -------        ---------------     ---------------
   Total from Investment Operations...           .7380              1.6808                .9563              2.1409
                                               -------             -------        ---------------     ---------------
   Less Distributions
   Dividends (from net investment
     income)..........................          (.4586)             (.5412)              (.3713)             (.4128)
   Distributions (from capital
     gains)...........................          (.9794)            (1.4696)              (.5950)             (.2781)
                                               -------             -------        ---------------     ---------------
   Total Distributions................         (1.4380)            (2.0108)              (.9663)             (.6909)
                                               -------             -------        ---------------     ---------------
Net asset value, end of period........       $   11.01           $   11.71          $     12.04         $     12.05
                                               -------             -------        ---------------     ---------------
                                               -------             -------        ---------------     ---------------
Total Return..........................            6.86%(b)           15.27%(b)             8.07%(b)           21.18%(b)
Ratios/Supplemental Data
   Net assets, end of period..........       $ 808,028           $ 761,817          $ 1,026,223         $ 1,290,340
   Ratios of expenses to average net
     assets...........................               0%(a)               0%(a)              .67%(a)            1.40%(a)
   Ratios of net investment income to
     average net assets...............            3.76%               4.13%                3.68%               3.58%
   Portfolio turnover rate............              32%                 30%                  93%                 76%
 
<CAPTION>
                                                             FOR THE PERIOD
                                                             OCTOBER 6, 1988
                                         FOR THE YEAR         (COMMENCEMENT
                                         ENDED AUGUST       OF OPERATIONS) TO
                                           31, 1990          AUGUST 31, 1989
                                        ---------------     -----------------
<S>                                       <C>               <C>
Net asset value, beginning of
 period...............................    $     11.32          $     10.00
                                        ---------------           --------
   Income from Investment Operations
   Net investment income..............          .4080                .4371
   Net gains (losses) on securities
     (both realized and unrealized)...         (.2785)              1.2239
                                        ---------------           --------
   Total from Investment Operations...          .1295               1.6610
                                        ---------------           --------
   Less Distributions
   Dividends (from net investment
     income)..........................         (.4296)              (.3419)
   Distributions (from capital
     gains)...........................         (.4199)                  --
                                        ---------------           --------
   Total Distributions................         (.8495)              (.3419)
                                        ---------------           --------
Net asset value, end of period........    $     10.60          $     11.32
                                        ---------------           --------
                                        ---------------           --------
Total Return..........................           1.09%(b)            17.03%(b)(d)
Ratios/Supplemental Data
   Net assets, end of period..........    $ 1,372,774          $ 1,127,714
   Ratios of expenses to average net
     assets...........................           1.40%(a)             1.40%(a)(c)
   Ratios of net investment income to
     average net assets...............           3.80%                4.90%(c)
   Portfolio turnover rate............             95%                  35%(d)
</TABLE>
 
- ------------
 
 (a) Without  the waiver  of advisory  and administration  fees and  without the
     reimbursement of  certain operating  expenses, the  ratios of  expenses  to
     average  net assets  for the  Balanced Fund  would have  been 5.46%, 5.37%,
     3.88%, 3.89% and  3.76% for the  years ended August  31, 1994, 1993,  1992,
     1991  and 1990,  respectively, and  2.83% annualized  for the  period ended
     August 31, 1989.
 
 (b) Sales load not  reflected in total  return. The sales  load was  eliminated
     effective August 31, 1994.
 
 (c) Annualized.
 
 (d) Not Annualized.
 
 (e) Formerly the RBB Balanced Portfolio. Prior to October 1, 1994, the Fund was
     advised by PNC Institutional Management Corporation.
 
                                       6

<PAGE>
INVESTMENT OBJECTIVES AND POLICIES
 
GROWTH & INCOME FUND
 
     The  Growth & Income Fund's investment  objectives are to provide long-term
growth of  capital and  income and  a reasonable  current return.  The Growth  &
Income  Fund seeks  to achieve its  objectives by investing  primarily in equity
securities. Equity  securities  include  common  stocks,  securities  which  are
convertible into common stocks and readily marketable securities, such as rights
and  warrants, which derive their  value from common stock.  The Growth & Income
Fund seeks  to achieve  its  income objective  by  investing in  various  income
producing  securities  including, but  not  limited to,  dividend  paying equity
securities and  fixed income  securities.  The Growth  &  Income Fund  may  also
purchase  without  limitation  dollar-denominated  American  Depository Receipts
('ADRs'). ADRs are issued by domestic banks and evidence ownership of underlying
foreign securities.  The  policy  of the  Growth  &  Income Fund  is  to  invest
substantially  all  of  its  assets in  equity  securities  under  normal market
conditions.
 
     The Growth  & Income  Fund may  invest up  to 10%  of its  total assets  in
securities  of  foreign  issuers.  Investing in  securities  of  foreign issuers
involves considerations not typically associated with investing in securities of
companies organized and operated  in the U.S.  Foreign securities generally  are
denominated  and pay dividends  or interest in foreign  currencies. The Growth &
Income Fund may hold from time to time various foreign currencies pending  their
investment  in foreign  securities or  their conversion  into U.S.  dollars. The
value of the assets of the Growth & Income Fund as measured in U.S. dollars  may
therefore  be affected  favorably or unfavorably  by changes  in exchange rates.
There may be less publicly available information concerning foreign issuers than
is available  with  respect to  U.S.  issuers.  Foreign securities  may  not  be
registered  with  the U.S.  Securities and  Exchange Commission,  and generally,
foreign companies are not subject to uniform accounting, auditing and  financial
reporting  requirements  comparable to  those  applicable to  U.S.  issuers. See
'Investment Objectives and Policies --  Foreign Securities' in the Statement  of
Additional Information.
 
ILLIQUID  SECURITIES. The Growth & Income Fund  will not invest more than 15% of
its net assets in illiquid securities, including securities that are illiquid by
virtue of the  absence of  a readily available  market or  legal or  contractual
restrictions  on resale. Securities that  have legal or contractual restrictions
on resale  but have  a readily  available  market are  not deemed  illiquid  for
purposes of this limitation. The Growth & Income Fund's adviser will monitor the
liquidity  of such restricted securities under the supervision of the investment
adviser  and   the  Board   of  Directors.   See  'Investment   Objectives   and
Policies -- Illiquid Securities' in the Statement of Additional Information.
 
OPTIONS AND FUTURES  CONTRACTS.  The Growth & Income Fund may write covered call
options,  buy put  options,  buy call  options  and write put  options,  without
limitation  except  as noted in this  paragraph.  Such  options  may  relate  to
particular  securities  or to various  indexes and may or may not be listed on a
national securities exchange and issued by the Options Clearing Corporation. The
Growth & Income Fund may also invest in futures contracts and options on futures
contracts  (index  futures  contracts  or interest  rate futures  contracts,  as
applicable)  for  hedging  purposes or for other  purposes so long as  aggregate
initial margins and premiums required for non-hedging positions do not exceed 5%
of its net assets,  after taking into account any unrealized  profits and losses
on any such contracts it has entered into. However, the Growth & Income Fund may
not write put  options  or  purchase  or sell  futures  contracts  or options on
futures  contracts to hedge more than its total assets unless  immediately after
any such  transaction the aggregate  amount of premiums paid for



                                       7
<PAGE>

put options and the amount of margin deposits on its existing futures  positions
do not exceed 5% of its total assets.
 
     Options trading is a highly specialized activity which entails greater than
ordinary  investment risks.  A call option  for a particular  security gives the
purchaser of the option the right to  buy, and a writer the obligation to  sell,
the  underlying security at the  stated exercise price at  any time prior to the
expiration of the option,  regardless of the market  price of the security.  The
premium  paid to the writer is  in consideration for undertaking the obligations
under the option  contract. A  put option for  a particular  security gives  the
purchaser the right to sell the underlying security at the stated exercise price
at any time prior to the expiration date of the option, regardless of the market
price  of the security.  In contrast to  an option on  a particular security, an
option on an index provides the holder with the right to make or receive a  cash
settlement  upon exercise of the  option. The amount of  this settlement will be
equal to the difference between  the closing price of the  index at the time  of
exercise  and the  exercise price  of the option  expressed in  dollars, times a
specified multiple.
 
     The Growth & Income Fund  will engage in unlisted over-the-counter  options
only with broker/dealers deemed creditworthy by Adviser. Closing transactions in
certain  options are usually effected directly  with the same broker/dealer that
effected the original  option transaction. The  Growth & Income  Fund bears  the
risk  that the  broker/dealer will  fail to  meet its  obligations. There  is no
assurance that the Growth & Income Fund will be able to close an unlisted option
position. Furthermore,  unlisted  options are  not  subject to  the  protections
afforded purchasers of listed options by the Options Clearing Corporation, which
performs the obligations of its members who fail to do so in connection with the
purchase or sale of options.
 
     To  enter into  a futures contract,  the Growth  & Income Fund  must make a
deposit of an initial margin with its  custodian in a segregated account in  the
name  of its futures broker.  Subsequent payments to or  from the broker, called
variation margin, will be made on a  daily basis as the price of the  underlying
security or index fluctuates, making the long and short positions in the futures
contracts more or less valuable.
 
     The  risks related to the use of options and futures contracts include: (i)
the  correlation  between  movements  in  the  market  price  of  a  portfolio's
investments (held or intended for purchase) being hedged and in the price of the
futures  contract or  option may  be imperfect; (ii)  possible lack  of a liquid
secondary market for closing  out options or futures  positions; (iii) the  need
for  additional portfolio management skills and  techniques; and (iv) losses due
to unanticipated market movements. Successful use of options and futures by  the
Growth  & Income Fund is  subject to the Adviser's  ability to correctly predict
movements in the direction of  the market. For example,  if the Growth &  Income
Fund  uses future contracts as  a hedge against the  possibility of a decline in
the market  adversely affecting  securities  held by  it and  securities  prices
increase  instead, the Growth & Income Fund will lose part or all of the benefit
of the increased value  of its securities  which it has  hedged because it  will
have approximately equal offsetting losses in its futures positions. The risk of
loss  in trading  futures contracts in  some strategies can  be substantial, due
both to  the low  margin deposits  required, and  the extremely  high degree  of
leverage  involved  in future  pricing. As  a result,  a relatively  small price
movement in a futures contract may  result in immediate and substantial loss  or
gain  to the investor. Thus, a purchase or sale of a futures contract may result
in losses or  gains in  excess of  the amount invested  in the  contract. For  a
further  discussion  see 'Investment  Policies' in  the Statement  of Additional
Information.
 
PORTFOLIO TURNOVER. The Growth & Income Fund will effect portfolio  transactions
without  regard to  holding period, if,  in its judgment,  such transactions are
advisable in light  of general



                                       8
<PAGE>

market, economic or financial conditions.  As a result, the Fund may engage in a
substantial  number of portfolio  transactions  which could cause the  portfolio
turnover  rate to exceed 100%,  although  under normal  conditions  the Growth &
Income Fund does not  anticipate  that its annual  portfolio  turnover rate will
exceed 100%.  However, it is impossible to predict portfolio turnover rates. The
portfolio  turnover  rate is  calculated  by  dividing  the lesser of the Fund's
annual sales or purchases of  portfolio  securities  (exclusive  of purchases or
sales of securities whose maturities at the time of acquisition were one year or
less) by the  monthly  average  value of the  securities  in the Fund during the
year.
 
     The  anticipated portfolio  turnover rate for  the Growth &  Income Fund is
greater than  that of  many other  investment companies.  A higher  than  normal
portfolio  turnover rate  may affect  the degree to  which the  Fund's net value
fluctuates.  Higher  portfolio   turnover  rates   are  likely   to  result   in
comparatively  greater  brokerage  commissions.  In  addition,  short-term gains
realized from portfolio  transactions are  taxable to  shareholders as  ordinary
income.  The amount  of portfolio  activity will not  be a  limiting factor when
making portfolio  decisions.  See  Statement  of  Additional  Information  'Fund
Transactions' and 'Taxes.'
 
TEMPORARY  DEFENSIVE MEASURES.  The Growth &  Income Fund reserves  the right to
hold,  as   a   temporary   defensive   measure,   cash   and   eligible,   U.S.
dollar-denominated  money market instruments,  as well as  securities subject to
repurchase agreements. The Growth  & Income Fund's  adviser will determine  when
market conditions warrant temporary defensive measures.
 
     The Growth & Income Fund's investment objectives and the policies described
above may be changed by RBB's Board of Directors without the affirmative vote of
the  holders of a  majority of the outstanding  Shares representing interests in
The Growth & Income Fund.  Such changes may result in  the Growth & Income  Fund
having  investment  objectives  which differ  from  those an  investor  may have
considered at the time of  investment. There is no  assurance that the Growth  &
Income Fund's investment objective will be achieved.
 
BALANCED FUND
 
     The  Balanced  Fund's  investment  objective is  to  maximize  total return
through a  combination  of  long-term  growth  of  capital  and  current  income
consistent with preservation of capital. The Balanced Fund seeks to achieve this
objective  through a policy of  diversified investment in dividend-paying common
stocks, preferred stocks, debt securities, preferred stocks and debt  securities
which  are convertible  into common stocks,  and government  corporate, bank and
commercial obligations. At all times, the  Balanced Fund will have a minimum  of
25%  of its  assets in  stocks and  minimum of  25% in  fixed income securities.
Compliance with  such  percentage  requirement  may limit  the  ability  of  the
Balanced  Fund  to maximize  total return.  With  respect to  convertible senior
securities, only that portion  of the value of  such securities attributable  to
their  fixed income characteristics will be used for purposes of determining the
percentage of the assets of the Balanced Fund that are invested in  fixed-income
senior  securities.  The  actual percentage  of  assets invested  in  equity and
fixed-income securities will vary from time  to time, depending on the  judgment
of  the sub-adviser  as to  general market  and economic  conditions, trends and
yields and interest rates and changes in fiscal and monetary policies.
 
MULTI-MANAGER  APPROACH.  The Balanced  Fund will be managed by a team of senior
managers of the investment adviser,  Warburg, Pincus Counsellors,  Inc. ('WPC').
Six of the managers will be dedicated to managing  portions of the Balanced Fund
allocated  to  equities;  one manager  will  select and manage the fixed  income
securities which comprise the fixed income portion of the Balanced Fund. Dale C.
Christensen  and  Anthony  G.  Orphanos,  Managing  Directors  of



                                       9
<PAGE>

WPC, will be designated  overall  portfolio  strategists and will be responsible
for determining the portion of the Balanced Fund to be allocated  between equity
and  fixed  income  securities,  and the  allocation  among the  various  equity
sectors.
 
     Equity Investment. Each  of the  equity portfolio managers  will manage  an
allocated  portion of the equity holdings of the Balance Fund; each manager will
manage his/her portion  with a  different investment emphasis  or approach,  but
consistent  with the  overall objective of  long-term growth of  capital for the
Balanced Fund's common stock portion.
 
     The four areas represented by the  equity portfolio managers are: (1)  U.S.
Value  Sector, managed by  Anthony G. Orphanos, will  invest primarily in stocks
whose acquisition  price represents  low absolute  or relative  value, based  on
historical  and financial analysis, and compared  to other stocks and sectors of
the Standard & Poor's 500 universe of  common stocks and other indices. (2)  U.S
Small  Company Sector, managed by Elizabeth B. Dater and Stephen J. Lurito, will
invest primarily  in common  stocks  and warrants  of small  capitalization  and
emerging  growth  U.S.  companies that  represent  attractive  opportunities for
maximum  capital  appreciation.   Emerging  growth  companies   are  small   and
medium-sized  companies  that have  passed their  start up  phase and  that show
positive earnings and prospects for achieving  significant profit and gain in  a
relatively  short period of time. (3) U.S. Mid-Capital Sector, managed by George
U. Wyper and Susan L. Black, will invest primarily in a diversified portfolio of
common stocks,  warrants and  securities convertible  into or  exchangeable  for
common  stock securities of domestic companies which have market capitalizations
in the  $660 million  to $13.8  billion range,  commonly referred  to as  middle
capitalization  or 'mid-cap,' and includes a  potential universe of companies in
such indices as the Russell Midcap Index and Standard & Poor's Midcap 400 Index.
The portfolio  manager  will attempt  to  identify  sectors of  the  market  and
companies  within market  sectors that he  believes will  outperform the overall
market. And, (4)  International Equity Sector,  managed by Richard  H. King  and
Nicholas  P.W. Horsley, will invest primarily in a broadly diversified portfolio
of equity securities of companies that, wherever organized, have their principal
business activities and interests outside  the United States. The  international
equity  managers intend to  invest principally in  the securities of financially
strong companies  with opportunities  for  growth within  growing  international
economies  and markets through increased earnings power and improved utilization
or recognition  of assets.  Investments  may be  made  in equity  securities  of
companies  of any size, whether traded on or off a national securities exchange.
Investments in foreign  securities involve risks  not otherwise associated  with
investments  in domestic  securities, including risks  of currency fluctuations,
tax or excessive government regulation, and political instability.
 
     Fixed  Income  Investment.  The  fixed  income  portion,  managed  by   Mr.
Christensen,  will  invest  primarily  in  debt  instruments  such  as corporate
obligations,   U.S.   Government   obligations,   municipal   obligations    and
mortgage-related debt securities.
 
CORPORATE  OBLIGATIONS.  The  Balanced  Fund may invest in debt  obligations  of
corporations,  such as corporate bonds, debentures,  debentures convertible into
common stocks, and notes, which, at the time of purchase for the Fund, are rated
'AAA,'  'AA' or 'A' by Standard & Poor's  Corporation  ('S&P') or 'Aaa,' 'Aa' or
'A,' by Moody's Investors Service, Inc. ('Moody's'). These ratings are described
in the Appendix to this  Prospectus.  The Balanced  Fund may also  purchase debt
obligations  which  are  unrated  at the  time of  purchase  provided  they  are
determined  by  the  Fund's  adviser  to  be  of  comparable  quality  to  rated
obligations pursuant to guide-lines  approved by RBB's Board of Directors.  Such
obligations may include dollar-denominated debt obligations of foreign issuers.
 


                                       10
<PAGE>


     In selecting debt securities for the Balanced Fund, the adviser will review
and monitor  the creditworthiness  of  each issuer  and  issue, in  addition  to
relying on ratings assigned by S&P or Moody's as indicators of quality. Interest
rate  trends and specific developments which  may affect individual issuers will
also be analyzed.
 
U.S. GOVERNMENT OBLIGATIONS. The Balanced  Fund may purchase obligations  issued
or  guaranteed  by the  U.S. Government  or  its agencies  or instrumentalities.
Obligations which  may  be so  purchased  include obligations  of  agencies  and
instrumentalities  of the U.S. Government which  are supported by the full faith
and credit of the U.S. or by U.S. Treasury guarantees, such as securities of the
Government National Mortgage Association and  the Federal Housing Authority,  or
obligations  supported  by the  right  of the  issuer  to borrow  from  the U.S.
Treasury, such as securities of the  Federal Home Loan Mortgage Corporation,  or
obligations  supported  only  by the  credit  of the  agency  or instrumentality
issuing the  obligation, such  as securities  of the  Federal National  Mortgage
Association and the Federal Loan Banks.
 
'WHEN-ISSUED'  SECURITIES.  The  Balanced  Fund  may  purchase  securities  on a
'when-issued'  basis.  When-issued  securities  are  securities  purchased   for
delivery  beyond the  normal settlement  date at a  stated price  and yield. The
Balanced Fund  will generally  not  pay for  such  securities or  start  earning
interest  on them until they are received. Securities purchased on a when-issued
basis are recorded  as an  asset when  the commitment  is entered  into and  are
subject  to changes in value prior to delivery based upon changes in the general
level of interest rates. The Balanced Fund expects that commitments to  purchase
when-issued  securities will  not exceed  25% of the  value of  its total assets
absent unusual market conditions. The Balanced Fund does not intend to  purchase
when-issued  securities for speculative purposes but  only in furtherance of its
investment objective.
 
MUNICIPAL OBLIGATIONS.  When  conditions warrant,  the  Balanced Fund  may  also
invest  without limitation in  Municipal Obligations, whether  or not the income
thereon is exempt from regular Federal  income tax, provided that the  Municipal
Obligations are determined by the Fund's adviser to present minimal credit risks
and  at the time of purchase are rated 'A' or higher by S&P or by Moody's in the
case of bonds,  'SP-1' by S&P  or 'MIG-2' or  higher by Moody's  in the case  of
notes,  or 'VMIG-2'  or higher by  Moody's in  the case of  variable rate demand
notes, or if unrated, are determined by the adviser to be of comparable  quality
pursuant  to guidelines adopted by RBB's Board of Directors. For a more complete
discussion  of   Municipal   Obligations,   see   'Investment   Objectives   and
Policies -- Municipal Obligations' in the Statement of Additional Information.
 
     MORTGAGE-RELATED  DEBT  SECURITIES.  The Balanced Fund may purchase without
limitation mortgage-related debt securities. Such securities represent interests
in pools of mortgage  loans to  residential  home buyers made by lenders such as
savings and loan  institutions,  mortgage bankers,  commercial banks and others.
Pools  of  mortgage  loans  are  assembled  for sale to  investors  (such as the
Balanced  Fund)  by  various   governmental,   government-related   and  private
organizations.  Mortgage-related  securities may include asset-backed securities
which  are  backed  by  mortgages,  installment  sales  contracts,  credit  card
receivables or other assets and  collateralized  mortgage  obligations  ('CMOs')
issued or guaranteed by U.S. Government agencies and instrumentalities or issued
by private  companies.  Purchasable  mortgage-related  securities  also  include
adjustable  rate  securities.  The estimated  life of an  asset-backed  security
varies  with the  prepayment  experience  with  respect to the  underlying  debt
instruments.  For this and other  reasons,  an  asset-backed  security's  stated
maturity may be shortened,  and the security's  total return may be difficult to
predict precisely. Such difficulties are not expected, however, to have a



                                       11
<PAGE>

significant  effect on  the Balanced  Fund since  the remaining  maturity of any
asset-backed security acquired will be 397 days or less.
 
     Interests in  pools of  mortgage  loans differ  from  other forms  of  debt
securities,  which normally  provide for periodic  payment of  interest in fixed
amounts with principal payments  at maturity or  specified call dates.  Instead,
these  securities  will provide  a monthly  payment to  the Balanced  Fund which
consists of both interest and principal payments. In effect, these payments  are
'pass-throughs'  of the  monthly payments  made by  the individual  borrowers on
their residential  mortgage  loans,  net of  any  fees  paid to  the  issuer  or
guarantor  of such  securities. Additional payments  to the Fund  may be derived
from  repayments  of  principal  resulting  from  the  sale  of  the  underlying
residential property, refinancing or foreclosure, net of fees or costs which may
be  incurred.  Some  mortgage-related  securities  are  described  as  'modified
pass-throughs.' These securities entitle the holder to receive all interest  and
principal payments owed on the mortgage pool, net of certain fees, regardless of
whether or not the mortgagor actually makes the payment.
 
     The  average life of mortgage-related securities varies with the maturities
of  the  underlying  mortgage  instruments.  In  addition,  prepayments  of  the
mortgages  included in the  underlying mortgage pool will  usually result in the
return of the greatest  part of principal invested  well before the maturity  of
the  mortgages in  the pool. The  volume of  such prepayments of  principal in a
given pool will influence the  actual yield of mortgage-related securities,  and
principal  returned to the Balanced  Fund as a holder  of such securities may be
reinvested in instruments  whose yield may  be higher or  lower than that  which
might  have been obtained had such prepayments not occurred. When interest rates
are decreasing, such prepayments usually increase, thereby reducing the  average
life of a pool. As a result, the reinvestment of such principal prepayments will
be at a lower rate than that on the original mortgage-related security, and thus
the  Balanced Fund's yield will  be lower. In addition,  when interest rates are
decreasing, the value of mortgage-related securities may not increase as much as
the value  of other  debt  securities. In  quoting yields  for  mortgage-related
securities,  the standard practice is to assume  that the securities will have a
12-year life.  As previously  noted,however, the  life of  individual pools  may
differ  widely and  the actual yield  earned on  mortgage-related securities may
differ significantly  from  the  estimated  yield  based  on  the  12-year  life
assumption.
 
     The  principal governmental guarantor of mortgage-related securities is the
Government National Mortgage Association ('GNMA').  GNMA is a wholly owned  U.S.
Government   corporation  within  the  U.S.  Department  of  Housing  and  Urban
Development. Pass-through securities issued by  GNMA are guaranteed by the  full
faith  and credit of the  U.S. Government as to  the timely payment of principal
and  interest.  The  Federal  National   Mortgage  Association  ('FNMA')  is   a
government-sponsored   corporation  owned  entirely   by  private  stockholders.
Pass-through securities issued by  FNMA are guaranteed as  to timely payment  of
principal  and interest by FNMA but are not  backed by the full faith and credit
of the U.S. Government. The Federal Home Loan Mortgage Corporation ('FHLMC')  is
a government-sponsored corporation owned entirely by private stockholders. FHLMC
issues Participation Certificates ('Pcs') which represent interests in mortgages
from FHLMC's national portfolio. FHLMC guarantees the timely payment of interest
and  ultimate collection of principal  but Pcs are not  backed by the full faith
and credit of the U.S. Government.
 
     Commercial banks, savings and loan institutions, private mortgage insurance
companies,  mortgage  bankers and other  secondary  market  issuers  also create
pass-through pools of conventional  residential mortgage loans. Such issuers may
in addition be the  originators of the underlying  mortgage loans as well as the
guarantors   of



                                       12
<PAGE>

the mortgage-related  securities. Pools created by such non-governmental issuers
generally offer a higher rate of interest than government and government-related
pools because there are no direct or indirect government  guarantees of payments
in the former pools. However,  timely payment of interest and principal of these
pools is  supported  by various  forms of  insurance  or  guarantees,  including
individual loan and pool  insurance.  The insurance and guarantees are issued by
government entities,  private insurers and the mortgage poolers.  Such insurance
and  guarantees  and  the  creditworthiness  of  the  issuers  thereof  will  be
considered in determining whether a mortgage-related security meets the Balanced
Fund's  investment  quality  standards.  Private insurers provide less assurance
than  government or  government-related  insurers that they will be able to meet
their obligations. The Balanced Fund may buy mortgage-related securities without
insurance or guarantees if,  through an  examination of the financial  condition
and business  history of the pooler,  including  among other things the pooler's
loan experience,  profitability,  capital adequacy, liquidity, foreign exposure,
and  management,  the  Balanced  Fund's  adviser  determines  that the pooler is
creditworthy.  Although the market for such securities is becoming  increasingly
liquid,  securities  issued by certain private  organizations may not be readily
marketable.
 
     Corporations that are government  owned, government-related or are  private
mortgage   poolers  may   create  mortgage  loan   pools  offering  pass-through
investments in addition to those described above. The mortgages underlying these
securities may be mortgage instruments whose principal or interest payments  may
vary  or whose terms to maturity may  differ from customary long-term fixed rate
mortgages. As new types of mortgage-related securities are developed and offered
to investors, the Balanced  Fund's adviser will  consider making investments  in
such  new types  of securities  consistent with  the Balanced  Fund's investment
objectives and  policies  and  with  due regard  to  those  quality  and  credit
standards, which, in the adviser's view, are applicable to such investments.
 
WARRANTS.  The  Balanced  Fund  may purchase  warrants  provided  that  they are
attached to securities that may otherwise be purchased by the Fund.
 
ILLIQUID SECURITIES. The Balanced Fund will not invest more than 15% of its  net
assets in illiquid securities. See 'Investment Objectives and Policies -- Growth
&  Income Fund  -- Illiquid  Securities' above,  and 'Investment  Objectives and
Policies -- Illiquid Securities' in the Statement of Additional Information.
 
PORTFOLIO TURNOVER. The Balanced Fund will effect portfolio transactions without
regard to holding period, if, in  its judgment, such transactions are  advisable
in  light of general market, economic or  financial conditions. As a result, the
Fund may engage in a substantial number of portfolio transactions. Moreover, due
to the reconfiguration of the Balanced Fund's portfolio occasioned by the change
in investment advisors in September, 1994, the portfolio turnover rates for both
the debt and equity portions of the  Balanced Fund are likely to exceed 150%  in
the  current  fiscal  year.  In  the  absence  of  these  unusual  and  isolated
circumstances, the Balanced Fund anticipates that, under normal conditions,  its
annual portfolio turnover rate should not exceed 100% for the equity portion and
100%  for  the  fixed  income  portion. However,  it  is  impossible  to predict
portfolio turnover rates.
 
     The anticipated portfolio turnover rate for the debt and equity portions of
the Balanced Fund are greater than that of many other investment companies.  For
a  discussion of the effects of higher portfolio turnover rates, see 'Investment
Objectives and Policies -- Growth & Income Fund -- Portfolio Turnover.'
 
TEMPORARY DEFENSIVE MEASURES. The  Balanced Fund also reserves  the right, as  a
temporary defensive measure, to purchase eligible, U.S. dollar-denominated money
market  instruments


                                       13
<PAGE>

and  securities  subject  to  repurchase  agreements.  The Fund's  adviser  will
determine when market conditions warrant temporary defensive measures.
 
The  investment objective and policies of  the Balanced Fund described above may
be changed by RBB's Board of Directors without the approval of a majority of the
outstanding Shares representing interest in the Fund. Such changes may result in
the Fund having investment  objectives which differ from  those an investor  may
have  considered  at the  time of  investment.  There is  no assurance  that the
investment objective of the Balanced Fund will be achieved.

INVESTMENT LIMITATIONS
 
The Funds  may not  change the  following investment  limitations (with  certain
exceptions,  as noted below)  without the affirmative  vote of the  holders of a
majority of a  Fund's outstanding  Shares. (A  complete list  of the  investment
limitations  that cannot be changed  without such a vote  of the shareholders is
contained  in  the  Statement   of  Additional  Information  under   'Investment
Objectives and Policies.')
 
     1.  Purchase the securities of any one issuer, other than securities issued
or guaranteed by the  U.S. Government or its  agencies or instrumentalities,  if
immediately  after and as a result of such purchase more than 5% of the value of
a Fund's total assets  would be invested  in the securities  of such issuer,  or
more than 10% of the outstanding voting securities of such issuer would be owned
by  a Fund, except that up  to 25% of the value of  a Fund's total assets may be
invested without regard to such limitations.
 
     2. Purchase any securities which would cause, at the time of purchase, more
than 25% of  the value  of the  total assets of  a Fund  to be  invested in  the
obligations  of issuers  in any industry,  provided that there  is no limitation
with respect to investments in U.S. Government obligations.
 
     In addition, the  Growth & Income  Fund may not  borrow money, except  from
banks  or by entering into reverse  repurchase agreements for temporary purposes
and then in amounts not in excess of 10% of the value of the Fund's total assets
at the time of such borrowing, and  only if after such borrowing there is  asset
coverage of at least 300% for all borrowings of the Fund; or mortgage, pledge or
hypothecate  any of its assets  except in connection with  any such borrowing or
reverse repurchase agreement and in amounts not  in excess of the lesser of  the
dollar  amounts borrowed or 10%  of the value of the  Fund's total assets at the
time of such borrowing;  or purchase portfolio  securities while borrowings  and
reverse  repurchase agreements  in excess  of 5%  of the  Fund's net  assets are
outstanding. (This  borrowing  provision is  not  for investment  leverage,  but
solely  to facilitate  management of  the Growth  & Income  Fund's securities by
enabling the  Growth  &  Income  Fund to  meet  redemption  requests  where  the
liquidation   of  portfolio  securities  is  deemed  to  be  disadvantageous  or
inconvenient.)
 
     Similarly,  the Balanced Fund may not borrow money, except from banks or by
entering into reverse  repurchase  agreements for temporary purposes and then in
amounts not in excess of 30% of the value of the Fund's total assets at the time
of such  borrowing,  and only if after such borrowing there is asset coverage of
at least 300% for all borrowings of the Fund; or mortgage, pledge or hypothecate
any of its  assets  except in  connection  with any such  borrowing  or  reverse
repurchase  agreement and in amounts not in excess of 125% of the dollar amounts
borrowed;   or  purchase  portfolio  securities  while  borrowings  and  reverse
repurchase  agreements in excess of 5% of the Fund's net assets are outstanding.
(This  borrowing  provision  is not  for  investment  leverage,  but  solely  to
facilitate management of the Balanced Fund's securities by enabling the Balanced
Fund to meet redemption  requests where the liquidation of portfolio  securities
is deemed to be disadvantageous or inconvenient.)



                                       14
<PAGE>


MANAGEMENT
 
BOARD  OF DIRECTORS. The business  and affairs of RBB  and the Funds are managed
under the direction of RBB's Board of Directors.
 
INVESTMENT ADVISER. Warburg,  Pincus Counsellors, Inc.  ('WPC'), a wholly  owned
subsidiary of Warburg, Pincus Counsellors G.P., serves as the investment adviser
to  the Funds. WPC,  organized in 1970, is  a professional investment counseling
firm which  provides  investment  services  to  investment  companies,  employee
benefit   plans,  endowment  funds,  foundations   and  other  institutions  and
individuals. WPC  currently  manages  over  $9.0 billion  in  assets,  of  which
approximately $4.0 billion are investment companies. WPC's principal offices are
located  at 466 Lexington Avenue,  New York, New York  10017-3147. As adviser to
the Funds,  WPC is  responsible for  overall  management of  the Funds,  and  is
responsible for all purchases and sales of portfolio securities for the Funds.
 
WPC  may,  at  its  own expense,  provide  promotional  incentives  to qualified
recipients who support the sale of shares of the Funds. Qualified recipients are
securities dealers who  have sold  Fund Shares  or others,  including banks  and
other  financial institutions,  under special  arrangements. In  some instances,
these  incentives   may  be   offered  only   to  certain   institutions   whose
representatives provide services in connection with the sale or expected sale of
significant amounts of Fund shares.
 
GROWTH  & INCOME FUND. Anthony  G. Orphanos, a Managing  Director of WPC who has
been with WPC for  the last sixteen  years, is Chief  Investment Officer and  is
responsible  for  the  day-to-day  management  of  the  Growth  &  Income Fund's
investments. Mr. Orphanos has been the portfolio manager of the Growth &  Income
Fund since WPC began serving as sub-advisor to the Fund in November 1991.
 
     For  the services provided and  expenses assumed by it,  WPC is entitled to
receive a fee from RBB, computed daily and payable monthly at an annual rate  of
.75%  of the Growth & Income Fund's average daily net assets. This fee is higher
than that paid by most investment companies.
 
BALANCED FUND. Dale C.  Christensen, a Managing Director  of WPC, has been  with
WPC  since 1989,  prior to which  he was  a Vice President  in the International
Private Banking division and  the domestic pension  fund management division  at
Citicorp,  a Fixed Income Portfolio  Manager at CIC Asset  Management and a Vice
President of Investments at First City  Trust. Mr. Christensen and Mr.  Orphanos
are  the overall portfolio strategists for the Balanced Fund and are responsible
for determining the portion of the Fund to be allocated among the various  fixed
income and equity sectors. Mr. Christensen also manages the fixed income portion
of  the Balanced Fund.  Mr. Orphanos is  responsible for the  U.S. Value Sector.
Elizabeth B. Dater  and Stephen  J. Lurito are  responsible for  the U.S.  Small
Company  Sector. Ms. Dater is  a Managing Director of WPC  and has been with WPC
since 1978. Mr. Lurito is a Managing Director at WPC and has been with WPC since
1987. George U. Wyper and Susan L. Black manage the U.S. Mid-Capital Sector. Mr.
Wyper joined  WPC in  August 1994,  before which  time he  was chief  investment
officer  of  White River  Corporation and  president  of Hanover  Advisers, Inc.
(1993-August 1994), chief investment officer of Fund American Enterprises,  Inc.
(1991-1993)  and the fixed income portfolio  manager of Firemen's Fund Insurance
Company (1987-1990). Ms. Black is a Managing  Director of WPC and has worked  at
WPC  since 1985. The International  Equity Sector is managed  by Richard H. King
and Nicholas P.W. Horsley. Mr.  King has been a  Managing Director of WPC  since
1989.   Mr.  Horsley  is  an  associate  portfolio  manager  with  WPC  and  has
been with WPC since 1993,  prior to which he  was a Director, portfolio  manager
and analyst at Barclays deZoete Wedd in New York City.
 
     For  the services provided and  expenses assumed by it,  WPC is entitled to
receive a fee 


                                       15
<PAGE>


from RBB,  computed  daily and payable  monthly at an annual rate of .90% of the
Balanced  Fund's average daily net assets.  This fee is higher than that paid by
most investment companies.
 
THE DISTRIBUTOR. Counsellors Securities  Inc. (the 'Counsellors Securities'),  a
wholly   owned  subsidiary  of  WPC,  serves   as  the  Funds'  distributor.  No
compensation is payable by  the Growth & Income  Fund to Counsellors  Securities
for  distribution services. Counsellors  Securities receives a  fee at an annual
rate equal  to  .25%  of  the  Balanced Fund's  average  daily  net  assets  for
distribution  services,  pursuant  to  a distribution  plan  (the  '12b-1 Plan')
adopted by the Fund pursuant to Rule  12b-1 under the 1940 Act. Amounts paid  to
Counsellors  Securities  under  the Balanced  Fund  12b-1  Plan may  be  used by
Counsellors Securities to cover  expenses that are related  to, (i) the sale  of
the  No  Load  Shares  of  the  Balanced  Fund,  (ii)  ongoing  servicing and/or
maintenance of the  accounts of  shareholders of  the Balanced  Fund, and  (iii)
sub-transfer  agency services, subaccounting services or administrative services
related to the sale of the No Load Shares of the Balanced Fund, all as set forth
in the Balanced  Fund 12b-1 Plan.  Payments under  the 12b-1 Plan  are not  tied
exclusively  to  the  distribution  expenses  actually  incurred  by Counsellors
Securities and  payments may  exceed  distribution expenses  actually  incurred.
RBB's  Board of Directors will evaluate the appropriateness of the 12b-1 Plan on
a continuing basis and in doing so will consider all relevant factors, including
expenses borne by Counsellors  Securities and amounts  received under the  12b-1
Plan.
 
CO-ADMINISTRATORS.   The   Funds   employ   Counsellors   Funds   Service,  Inc.
('Counsellors  Service'),  a  wholly-owned  subsidiary  of  Counsellors,  as   a
co-administrator.  As co-administrator, Counsellors Service provides shareholder
liaison services to the Funds including responding to shareholder inquiries  and
providing  information on  shareholder accounts.  As compensation,  the Growth &
Income Fund pays to Counsellors  Service a fee calculated  at an annual rate  of
.05%  of  the Fund's  average daily  net assets  for the  first $125  million of
average daily net assets and .10% of  average daily net assets for assets  above
$125  million; the Balanced Fund pays to Counsellors Service a fee calculated at
an annual rate of .10% of average daily net assets.
 
     The Funds  also  employ  PFPC  Inc.  ('PFPC'),  an  indirect,  wholly-owned
subsidiary of PNC Bank Corp., as a co-administrator. As a co-administrator, PFPC
calculates the Funds' net asset values, provides all accounting services for the
Funds  and assists in related aspects of the Funds' operations. As compensation,
the Growth & Income Fund pays to PFPC a fee calculated at an annual rate of .20%
of the  Fund's first  $125 million  of average  daily net  assets, and  .15%  of
average daily net assets over $125 million; the Balanced Fund pays to PFPC a fee
calculated  at an annual rate of .15% of  average daily net assets. PFPC has its
principal offices at 400 Bellevue Parkway, Wilmington, Delaware 19809.
 
CUSTODIAN. PNC  Bank serves  as RBB's  custodian. State  Street Bank  and  Trust
Company   ('State  Street')  serves  as  co-custodian  for  the  Funds'  foreign
securities.
 
TRANSFER AGENT AND SUB-TRANSFER AGENT. PFPC  serves as RBB's transfer agent  and
dividend  disbursing agent.  State Street  acts as  shareholder servicing agent,
sub-transfer agent and dividend disbursing agent for the Funds. It has delegated
to Boston  Financial  Data Services,  Inc.  ('BFDS'), a  50%  owned  subsidiary,
responsibility   for  most  shareholder   servicing  functions.  State  Street's
principal business address is 225 Franklin Street, Boston, Massachusetts 02110.
 
EXPENSES.  The expenses of the Funds are deducted from their total income before
dividends are paid. These expenses include, but are not limited to, fees paid to
the investment adviser,  fees and expenses of officers and directors who are not
affiliated with the Fund's investment adviser or Distributor,  taxes,  interest,
legal fees,  custodian  fees,  auditing fees,  brokerage  fees and  commissions,
certain of the fees and

                                       16

<PAGE>

expenses  of  registering   and  qualifying  the  Funds  and  their  shares  for
distribution  under  Federal and state  securities  laws,  expenses of preparing
prospectuses  and  statements  of  additional  information  and of printing  and
distributing  prospectuses and statements of additional  information annually to
existing  shareholders that are not attributable to a particular class of shares
of RBB, the expense of reports to shareholders, shareholders' meetings and proxy
solicitations  that are not attributable to a particular class of shares of RBB,
fidelity bond and  directors  and officers  liability  insurance  premiums,  the
expense of using  independent  pricing services and other expenses which are not
expressly assumed by the adviser under its investment  advisory  agreements with
respect  to the  Funds.  Any  general  expenses  of RBB  that  are  not  readily
identifiable  as belonging to a particular  investment  portfolio of RBB will be
allocated  among all  investment  portfolios  of RBB based upon the relative net
assets  of the  investment  portfolios  at the time  such  expenses  are  cited.
Distribution  expenses,  transfer  agency  expenses,  expenses  of  preparation,
printing and distributing  prospectuses,  statements of additional  information,
proxy statements and reports to shareholders,  and registration fees, identified
as belonging to a particular class, are allocated to such class.
 
     The investment adviser has agreed to reimburse the Funds for the amount, if
any,  by which the total operating and  management expenses of the Funds for any
fiscal year exceed  the most restrictive  state blue sky  expense limitation  in
effect from time to time, to the extent required by such limitation.
 
     The  investment adviser  may assume additional  expenses of  the Funds from
time to  time. In  certain circumstances,  it may  assume such  expenses on  the
condition  that it is reimbursed by  RBB for such amounts prior  to the end of a
fiscal year. In  such event,  the reimbursement of  such amounts  will have  the
effect  of  increasing  a  Fund's  expense  ratio  and  of  decreasing  yield to
investors.
 
     For the  Funds' fiscal  year ended  August 31,  1994, the  Growth &  Income
Fund's  total expenses were 1.28% of average net assets, and the Balanced Fund's
total expenses  were 5.46%  of average  net assets  before expense  waivers  and
reimbursements.  WPC has agreed to waive  expenses and provide reimbursements to
limit the  Balanced Fund's  total expenses  to 1.60%  per annum  of average  net
assets. However, there can be no assurance that WPC will continue to assume such
expenses.
 
FUND  TRANSACTIONS.  The Funds'  adviser  may consider  a  number of  factors in
determining which brokers to use in purchasing or selling the Funds' securities.
These factors, which  are more fully  discussed in the  Statement of  Additional
Information,   include,  but  are   not  limited  to,   research  services,  the
reasonableness  of   commissions  and   quality  of   services  and   execution.
Transactions  for the Funds may be  effected through Authorized Dealers, subject
to the requirements of best execution. The  higher rate of turnover of a  Fund's
securities  may involve correspondingly higher  transaction costs, which will be
borne directly by the  Fund. A Fund may  enter into brokerage transactions  with
and  pay brokerage commissions  to brokers that are  affiliated persons (as such
term is  defined in  the 1940  Act) provided  that the  terms of  the  brokerage
transactions comply with the provisions of the 1940 Act.
 
DISTRIBUTION OF SHARES
 
     Counsellors  Securities, a wholly owned subsidiary  of WPC, with offices at
466 Lexington Avenue, New York, New York, acts as distributor for the Funds.
 
HOW TO PURCHASE SHARES
 
     Shares of a Fund may be purchased  either by mail, or with special  advance
instructions, by wire.


                                       17
<PAGE>


BY  MAIL. If the investor  desires to purchase shares by  mail, a check or money
order made payable to RBB or Warburg  Pincus Funds (in U.S. currency) should  be
sent  along  with  the completed  account  application to  Warburg  Pincus Funds
through its distributor, Counsellors Securities  Inc., at the address set  forth
above.  Checks payable  to the  investor and  endorsed to  the order  of Warburg
Pincus Funds will not be accepted as payment and will be returned to sender.  If
payment  is received  by check in  proper form  on or before  4:00 p.m. (Eastern
time) on a day that a Fund calculates its net asset value (a 'business day') the
purchase will be made  at the Fund's  net asset value calculated  at the end  of
that  day. If payment is received after 4:00 p.m., the purchase will be effected
at the Fund's net asset value determined for the next business day after payment
has been received. Checks or  money orders that are not  in proper form or  that
are  not accompanied or preceded  by a complete application  will be returned to
sender. Shares  purchased  by  check  are  entitled  to  receive  dividends  and
distributions  beginning  on the  day after  payment  has been  received. Checks
should be made payable to  Warburg Pincus Funds for  an investment in more  than
one  mutual fund  managed by WPC,  and should  be accompanied by  a breakdown of
amounts to be  invested in  the Funds.  If a check  used for  purchase does  not
clear,  the Funds will  cancel the purchase  and the investor  may be liable for
losses or fees incurred. For a description of the manner of calculating a Fund's
net asset value, see 'Net Asset Value' below.
 
BY WIRE. Investors may also purchase shares in a Fund by wiring funds from their
banks.  Telephone  orders  will  not  be  accepted  until  a  completed  account
application  in proper  form has  been received and  an account  number has been
established. After  telephoning (800)  888-6878  for instructions,  an  investor
should  then  wire  federal  funds  to  Counsellors  Securities  Inc.  using the
following wire address:
 
State Street Bank and Trust Co.
225 Franklin Street
Boston, MA 02101
ABA# 0110 000 28
Attn: Mutual Funds/Custody Dept.
[Warburg Pincus Growth & Income or
Warburg Pincus Balanced Fund, as applicable]
DDA# 9904-649-2
[Shareowner name]
[Shareowner account number]
 
     If payment by  wire in  proper form  is received  by the  close of  regular
trading  on the New  York Stock Exchange ('NYSE')  (currently 4:00 p.m., Eastern
time), the  shares will  be  priced according  to the  net  asset value  of  the
relevant  Fund  on that  day  and are  entitled  to dividends  and distributions
declared beginning on that day. If a payment by wire in proper form is  received
after  the  close of  regular  trading on  the NYSE,  the  payment will  be held
uninvested until the  order is effected  at the  close of business  on the  next
business  day. Payment for wires  that are not accepted  will be returned to the
prospective investor after prompt inquiry.
 
     Shares of  a Fund  are sold  without a  sales charge.  The minimum  initial
investment  in a Fund is  $1,000 and the minimum  subsequent investments must be
$100, except that subsequent minimum investments can be as low as $50 under  the
Automatic  Monthly  Investment  Plan  described  in  the  next  section.  For  a
tax-deferred retirement plan, such as an IRA, the minimum initial and subsequent
investment is $500, except that subsequent minimum investments can be as low  as
$50 under the Automatic Monthly Investment Plan.
 
     After an investor has made his initial investment, additional shares may be
purchased  at any time by mail or by wire in the  manner  outlined  above.  Wire
payments for initial and  subsequent  investments  should  clearly  indicate the
investor's account number. In the interest of economy and convenience,  physical
certificates representing shares in a Fund are not normally issued.



                                       18
<PAGE>

 
     Investors who  purchase shares  of a  Fund through  a program  of  services
offered  or administered by a securities  dealer or financial institution should
read the program materials in conjunction with this Prospectus. Certain features
of a Fund, such as the minimum initial or subsequent investment, may be modified
in these programs, and  administrative charges may be  imposed for the  services
rendered. The Funds reserve the right to vary further the initial and subsequent
minimum investment requirements at any time.
 
     The  Funds  understand  that some  broker-dealers  (other  than Counsellors
Securities), financial  institutions,  securities  dealers  and  other  industry
professionals  ('Service Agents') may impose certain conditions on their clients
that invest in  the Funds,  which are  in addition  to or  different from  those
described  in  this  Prospectus,  and, to  the  extent  permitted  by applicable
regulatory authority, may charge their clients direct fees. Certain features  of
the  Funds,  such  as the  minimum  initial  or subsequent  investments,  may be
modified in these programs,  and administrative charges may  be imposed for  the
services   rendered.  Therefore,  a  client   or  customer  should  contact  the
organization acting  on his  behalf  concerning the  fees  (if any)  charged  in
connection with a purchase or redemption of a Fund's shares and should read this
Prospectus  in light  of the terms  governing his accounts  with Service Agents.
Service Agents will be responsible for promptly transmitting client or  customer
purchase  and redemption orders to the Funds in accordance with their agreements
with clients or customers. Certain Service Agents may receive compensation  from
Counsellors or Counsellors Service. See 'Shareholder Servicing.' Certain Service
Agents  that have entered into agreements  with Counsellors Securities may enter
confirmed purchase orders  on behalf  of customers,  with payment  to follow  no
later  than the Funds' pricing on the  following business day. If payment is not
received by such time, the Service Agent could be held liable for resulting fees
or losses.
 
     Each Fund may also be made available through the brokerage firms Waterhouse
Securities, Inc. and  Jack White  & Company, Inc.  Each Fund  is also  available
through  the Charles  Schwab & Company,  Inc. Mutual  Fund OneSource'tm' Program
('Schwab') and the  Fidelity Brokerage Services,  Inc. FundsNetwork'tm'  Program
('Fidelity').  For  distribution  and sub-accounting  services  with  respect to
shares of a  Fund held by  each of these  firms, Counsellors pays  Jack White  &
Company  up  to .25%,  Waterhouse  Securities up  to  .30% and  pays  Schwab and
Fidelity up to .35% of the annual average value of such accounts. Purchases made
through these programs do not require customers to pay a transaction fee.
 
AUTOMATIC MONTHLY INVESTING. Automatic monthly investing allows shareholders  to
authorize  the Funds to debit  their bank account monthly  ($50 minimum) for the
purchase of Fund shares on or about  either the tenth or twentieth business  day
of  each month.  To establish the  automatic monthly investing  option, obtain a
separate application or complete the  'Automatic Investment Program' section  of
the  account  application and  include a  voided, unsigned  check from  the bank
account to be debited. Only an account maintained at an automated clearing house
member may be  used. Shareholders using  this service must  satisfy the  initial
investment  minimum for  a Fund  prior to  or concurrent  with the  start of any
Automatic Investment Program. Please refer to an account application for further
information or  contact Warburg  Pincus Funds  at (800)  888-6878 to  modify  or
terminate the program. Investors should allow a period of up to 30 days in order
to  implement an automated  investment program. The  failure to provide complete
information could result in further delays.
 
RETIREMENT PLANS.  For  information  about  investing in  the  Funds  through  a
tax-deferred  retirement plan, such as  an Individual Retirement Account ('IRA')
or a Simplified Employee Pension  IRA ('SEP-IRA'), an investor should



                                       19
<PAGE>

telephone  Warburg  Pincus  Funds at (800)  888-6878 or write to Warburg  Pincus
Funds at the address set forth above.  Investors  should  consult  their own tax
advisers about the establishment of retirement plans. HOW TO REDEEM AND EXCHANGE
SHARES
 
REDEMPTION  OF SHARES. An investor of a Fund may redeem (sell) his shares on any
day that the Fund's net asset value is calculated (see 'Net Asset Value' below).
 
     Shares of a Fund may either be redeemed by mail or by telephone.  Investors
should  realize that in using the  telephone redemption and exchange option, you
may be giving up a measure of security  that you may have if you were to  redeem
or  exchange your shares in writing. If an investor desires to redeem his shares
by mail, a written request for redemption should be sent to Warburg Pincus Funds
at the address  indicated below  under 'Separate Transfer  Agent Agreement.'  An
investor  should be  sure that the  redemption request identifies  the Fund, the
number of shares to be redeemed and  the investor's account number. In order  to
change  the  bank  account  or  address  designated  to  receive  the redemption
proceeds, the investor must send a written request (with signature guarantee  of
all  investors listed on the  account when such a  change is made in conjunction
with a redemption request) to Warburg Pincus Funds. Each mail redemption request
must be signed by the registered owner(s) or his legal representative(s) exactly
as the  shares are  registered. If  an investor  has applied  for the  telephone
redemption  feature  on his  account application,  he may  redeem his  shares by
calling Warburg Pincus Funds at (800) 888-6878 between 9:00 a.m. and 4:00  p.m.,
Eastern  time on  any business  day. An  investor making  a telephone withdrawal
should state (i)  the name of  the Fund, (ii)  the account number  of the  Fund,
(iii)  the name  of the  investor(s) appearing on  the Fund's  records, (iv) the
amount to be withdrawn and (v) the name of the person requesting the redemption.
 
     After receipt  of the  redemption  request by  mail  or by  telephone,  the
redemption  proceeds will, at the  option of the investor,  be paid by check and
mailed to the investor of record or be wired to the investor's bank as indicated
in the account  application previously filled  out by the  investor. No  Warburg
Pincus  Fund currently imposes a service charge for effecting wire transfers but
each such Fund  reserves the right  to do so  in the future.  During periods  of
significant economic or market change, telephone redemptions may be difficult to
implement.  If  an  investor  is  unable  to  contact  Warburg  Pincus  Funds by
telephone, an  investor may  deliver the  redemption request  to Warburg  Pincus
Funds  by  mail  at  the  address shown  below  under  'Separate  Transfer Agent
Agreement.' Although the Funds will redeem shares purchased by check before  the
check  clears, payments  of the redemption  proceeds will be  delayed until such
check has  cleared,  which may  take  up to  15  days from  the  purchase  date.
Investors  should consider  purchasing shares  using a  certified bank  check or
money order if they anticipate an immediate need for a redemption.
 
     If a redemption  order is received prior to the close of regular trading on
the NYSE, the redemption order will be effected at the net asset value per share
as determined on that day. If a redemption  order is received after the close of
regular  trading on the NYSE, the  redemption  order will be effected at the net
asset value as next determined.  Redemption  proceeds will normally be mailed or
wired to an investor on the next  business day  following  the date a redemption
order is effected.  If, however, in the judgment of WPC, immediate payment would
adversely  affect a Fund,  the Funds  reserve  the  right to pay the  redemption
proceeds within seven days after the redemption order is effected.  Furthermore,
a Fund may suspend the right of  redemption or postpone the date of payment upon
redemption (as well as suspend or



                                       20
<PAGE>


postpone  the  recordation  of an exchange  of shares)  for such  periods as are
permitted under the 1940 Act.
 
     The proceeds  paid upon  redemption may  be more  or less  than the  amount
invested  depending upon a share's net asset value at the time of redemption. If
an  investor  redeems  all  the  shares  in  his  account,  all  dividends   and
distributions declared up to and including the date of redemption are paid along
with the proceeds of the redemption.
 
     If,  due to redemptions, the  value of an investor's  account drops to less
than $500, the Funds reserve the right  to redeem the shares in that account  at
net  asset value.  Prior to any  redemption, a  Fund will notify  an investor in
writing that this account has a value of less than $500. The investor will  then
have  60  days to  make an  additional  investment before  a redemption  will be
processed by a Fund.
 
SEPARATE TRANSFER AGENT  ARRANGEMENT. Shareholders who  purchased shares of  the
Funds  through  Counsellors Securities  or Warburg  Pincus  Funds should  send a
written request for  additional share  purchases or redemptions  in proper  form
directly  to:  Warburg  Pincus  Funds, P.O.  Box  9030,  Boston,  MA 02205-9030.
Investors who indicated instructions for  telephone redemption by wire or  check
on  their original Warburg  Pincus Funds application  form may telephone Warburg
Pincus Funds at 1-800-888-6878.
 
     Shareholders who made their purchases  of shares of the RBB/Warburg  Pincus
Growth  & Income Fund through any other  Authorized Dealer or Brokerage Firm may
direct their redemption requests in writing  to Warburg Pincus Funds, c/o  PFPC,
P.O.  Box  8950, Wilmington,  Delaware 19899.  Shareholders who  purchased their
shares of these  Funds through an  Authorized Dealer may  also place  redemption
requests through an Authorized Dealer, but such Authorized Dealer might charge a
fee for this service.
 
TELEPHONE  TRANSACTIONS. In order to request redemptions by telephone, investors
must have completed and returned to Warburg Pincus Funds an account  application
containing  a telephone election.  Unless contrary instructions  are elected, an
investor will be entitled to make exchanges by telephone. Neither a Fund nor its
agents will be liable for following instructions communicated by telephone  that
it  reasonably believes to be genuine. Reasonable procedures will be employed on
behalf of the Funds to confirm  that instructions communicated by telephone  are
genuine.  Such procedures  include providing  written confirmation  of telephone
transactions, tape  recording  telephone  instructions  and  requiring  specific
personal  information prior to  acting upon telephone  instructions. If these or
other reasonable procedures are  not followed, the Funds  may be liable for  any
losses due to unauthorized or fraudulent instructions.
 
AUTOMATIC  CASH WITHDRAWAL  PLAN. Each Fund  offers investors  an automatic cash
withdrawal plan  under  which  investors  may elect  to  receive  periodic  cash
payments  of at  least $1,000 monthly  or quarterly. To  establish this service,
complete the 'Automatic Withdrawal Plan' section of the account application  and
attach  a  voided  check from  the  bank  account to  be  credited.  For further
information regarding  the  automatic  cash  withdrawal plan  or  to  modify  or
terminate  the  Plan, investors  should contact  Warburg  Pincus Funds  at (800)
888-6878.
 
EXCHANGE OF SHARES. An investor may exchange shares of a Fund for shares of  the
same  class of the  other Fund or for  shares of the same  class of other mutual
funds advised by WPC at their respective net asset value. However,  shareholders
may  not effect exchanges between No Load  Shares and Series 2 Shares. Exchanges
may   be    effected    by   mail    or    by   telephone    in    the    manner
described under 'Redemption of Shares' above. If an exchange request is received
by  Warburg Pincus Funds prior to 4:00 p.m. (Eastern time), the exchange will be
made to the Fund's net asset



                                       21
<PAGE>


value  determined at the end of that business  day.  Exchanges  will be effected
without a sales charge but must satisfy the minimum dollar amount  necessary for
new  purchases.  Due to the costs  involved in  effecting  exchanges,  the Funds
reserve  the right to refuse to honor more than  three  exchange  requests  by a
shareholder  in any 30-day  period.  The exchange  privilege  may be modified or
terminated  at any  time  upon  60  days'  notice  to  shareholders.  Currently,
exchanges may be made among the Funds with the following other funds:
 
      WARBURG  PINCUS  CASH RESERVE  FUND --  a money  market fund  investing in
      short-term, high quality money market instruments;
 
      WARBURG PINCUS NEW YORK TAX EXEMPT  FUND -- a money market fund  investing
      in  short-term, high quality  municipal obligations designed  for New York
      investors seeking income exempt from federal, New York State and New  York
      City income tax;
 
      WARBURG  PINCUS  NEW  YORK  MUNICIPAL BOND  FUND  --  an intermediate-term
      municipal bond fund designed for New York investors seeking income  exempt
      from federal, New York State and New York City income tax;
 
      WARBURG    PINCUS   INTERMEDIATE   MATURITY    GOVERNMENT   FUND   --   an
      intermediate-term bond fund investing in obligations issued or  guaranteed
      by the U.S. government, its agencies or instrumentalities;
 
      WARBURG  PINCUS FIXED  INCOME FUND --  a bond fund  seeking current income
      and, secondarily,  capital  appreciation  by investing  in  a  diversified
      portfolio of fixed-income securities;
 
      WARBURG  PINCUS  SHORT-TERM AFTER-TAX  BOND FUND  --  a bond  fund seeking
      maximum income  after the  effect of  federal income  taxes as  a  primary
      objective  and  capital  appreciation  as  a  secondary  objective through
      investments in taxable and tax-exempt debt instruments;
 
      WARBURG PINCUS GLOBAL  FIXED INCOME  FUND -- a  bond fund  investing in  a
      portfolio  consisting  of  investment  grade  fixed  income  securities of
      governmental and  corporate  issuers denominated  in  various  currencies,
      including U.S. dollars;
 
      WARBURG  PINCUS  CAPITAL  APPRECIATION  FUND  --  an  equity  fund seeking
      long-term capital  appreciation  by  investing  in  equity  securities  of
      financially strong domestic companies;
 
      WARBURG  PINCUS EMERGING  GROWTH FUND  -- an  equity fund  seeking maximum
      capital appreciation by investing in emerging growth companies;
 
      WARBURG PINCUS INTERNATIONAL EQUITY FUND  -- an international equity  fund
      seeking long-term capital appreciation.
 
      WARBURG  PINCUS JAPAN OTC FUND -- an equity fund seeking long-term capital
      appreciation by  investing in  a  portfolio of  securities traded  in  the
      Japanese over-the-counter market.
 
     The exchange  privilege is available to shareholders  residing in any state
in which the Funds' shares being acquired may legally be sold.  When an investor
effects an exchange of shares,  the  exchange is treated for federal  income tax
purposes as a redemption.  Therefore, the investor may realize a taxable gain or
loss in connection  with the exchange.  Investors  wishing to exchange shares of
the Funds for shares in another Warburg Pincus Fund should review the prospectus
of the other fund prior to making an exchange. For further information regarding
the exchange  privilege or to obtain a current  prospectus  for another  Warburg
Pincus Fund, an


                                       22
<PAGE>


investor should contact Warburg Pincus Funds at (800) 257-5614.

NET ASSET VALUE
 
     The  net  asset value  per  class of  a Fund  is  calculated by  adding the
relevant class' pro rata share of the  value of the Fund's securities, cash  and
other  assets, deducting the  relevant class' pro  rata share of  the actual and
accrued liabilities and the liabilities  specifically allocated to the  relevant
class,  and  dividing  by the  total  number  of Shares  of  the  relevant class
outstanding. The net asset value per class of the Fund is calculated as of  4:00
p.m. Eastern Time on each Business Day.
 
     Valuation  of securities held by the Funds is as follows: securities traded
on a national securities  exchange or on the  NASDAQ National Market System  are
valued at the last reported sale price that day; securities traded on a national
securities exchange or on the NASDAQ National Market System for which there were
no sales on that day and securities traded on other over-the-counter markets for
which  market quotations are readily available are valued at the mean of the bid
and asked prices;  and securities for  which market quotations  are not  readily
available  are valued  at fair market  value as  determined in good  faith by or
under the direction of  RBB's Board of Directors.  The amortized cost method  of
valuation  may also be used with respect  to debt obligations with sixty days or
less remaining to maturity.
 
     With the approval  of the  Board of  Directors, a  Fund may  use a  pricing
service,  bank or broker-dealer experienced in  such matters to value the Fund's
securities. A more detailed discussion of net asset value and security valuation
is contained in the Statement of Additional Information.

DIVIDENDS AND DISTRIBUTIONS
 
     The Funds will distribute  substantially all of  the net investment  income
and net realized capital gains, if any, of the Funds to the Funds' shareholders.
All  distributions are reinvested in the  form of additional full and fractional
Shares unless a shareholder elects otherwise.
 
     The Funds  will declare  and pay  dividends, if  any, from  net  investment
income  quarterly,  near the  end of  each quarter.  Net realized  capital gains
(including net short-term capital gains), if  any, will be distributed at  least
annually.
 
TAXES
 
     The  following discussion is only a brief  summary of some of the important
tax considerations generally affecting the  Funds and their shareholders and  is
not intended as a substitute for careful tax planning. Accordingly, investors in
the Funds should consult their tax advisers with specific reference to their own
tax situation.
 
     The  Funds will elect  to be taxed as  regulated investment companies under
Subchapter M of the Internal  Revenue Code of 1986, as  amended. So long as  the
Funds  qualify for  this tax  treatment, the Funds  will be  relieved of Federal
income tax  on amounts  distributed to  shareholders, but  shareholders,  unless
otherwise  exempt,  will  pay  income  or  capital  gains  taxes  on  amounts so
distributed (except distributions that constitute 'exempt interest dividends' or
that  are  treated  as  a  return   of  capital)  regardless  of  whether   such
distributions are paid in cash or reinvested in additional Shares.
 
     Distributions  out of the  'net capital gain' (the  excess of net long-term
capital gain over net  short-term capital loss),  if any, of  the Funds will  be
taxed to shareholders as long-term capital gain regardless of the length of time
a  shareholder has held his Shares, whether such gain was reflected in the price
paid for the  Shares, or  whether such gain  was attributable  to bonds  bearing
tax-exempt  interest. All other  distributions, to the  extent they are taxable,
are   taxed    to    shareholders    as    ordinary    income.    The    maximum
marginal  rate  on  ordinary  income  for  individuals,  trusts  and  estates is
generally 31%  while  the maximum  rate  imposed on  net  capital gain  of



                                       23
<PAGE>

such taxpayers is 28%.  Corporate  taxpayers are taxed at the same rates on both
ordinary income and capital gains.
 
     The Funds anticipate that dividends paid by the Funds will be eligible  for
the  70% dividends  received deduction  allowed to  certain corporations  to the
extent of the gross amount of qualified dividends received, respectively, by the
Funds for  the year.  However, corporate  shareholders will  have to  take  into
account the entire amount of any dividend received in determining their adjusted
current  earnings adjustment for alternative minimum tax purposes. The dividends
received deduction is not available for capital gain dividends.
     The Funds will send written notices to shareholders annually regarding  the
tax  status of distributions  made by the Funds.  Dividends declared in October,
November or  December  of  any year  payable  to  shareholders of  record  on  a
specified  date in  such a  month will be  deemed to  have been  received by the
shareholders on December 31, provided such dividends are paid during January  of
the  following  year.  The Funds  intend  to  make sufficient  actual  or deemed
distributions prior to  the end  of each calendar  year to  avoid liability  for
Federal excise tax.
 
     Investors  should be  careful to  consider the  tax implications  of buying
Shares just prior to a distribution. The price of shares purchased at that  time
will  reflect  the  amount  of  the  forthcoming  distribution.  Those investors
purchasing just prior to a distribution will nevertheless be taxed on the entire
amount of the distribution received.
 
     Shareholders who exchange  Shares representing interests  in the Funds  for
Shares  representing interests in another  Fund will generally recognize capital
gain or loss for Federal income tax purposes.
 
     Shareholders who  are  nonresident  alien individuals,  foreign  trusts  or
estates,  foreign  corporations  or  foreign  partnerships  may  be  subject  to
different U.S. Federal income tax treatment.
 
     An investment in any RBB portfolio is not intended to constitute a balanced
investment program.
 
     Future  legislative  or  administrative  changes  or  court  decisions  may
materially  affect the tax consequences of  investing in the Funds. Shareholders
are also urged to consult their tax advisers concerning the application of state
and local income taxes  to investments in  the Funds which  may differ from  the
Federal income tax consequences described above.
 
SHAREHOLDER SERVICING
 
     Each Fund is authorized to offer Series 2 Shares  exclusively  to financial
institutions  and  retirement  plans   ('Institutions'),   whose  customers  (or
participants  in the case of  retirement  plans)  ('Customers')  are  beneficial
owners of Series 2 Shares.  Either those  institutions  or  companies  providing
certain  services to them (together,  'Service  Organizations')  will enter into
service  agreements  ('Agreements')  related  to the sale of the Series 2 Shares
with Counsellors  Securities pursuant to a Distribution Plan as described below.
Pursuant  to the terms of the  Agreements,  the Service  Organization  agrees to
perform  certain  distribution,   shareholder   servicing,   administrative  and
accounting services for its Customers.  Distribution services would be marketing
or other services in connection  with the promotion and sale of Series 2 Shares.
Shareholder  services  that  may be  provided  include  responding  to  customer
inquiries,  providing  information on customer  investments  and providing other
shareholder liaison services.  Administrative and accounting services related to
the sale of the Series 2 Shares  may  include  (i)  aggregating  and  processing
purchase and  redemption  requests  from  Customers and placing net purchase and
redemption  orders  with a  Fund's  transfer  agent,  (ii)  processing  dividend
payments from a Fund on behalf of Customers



                                       24
<PAGE>


and  (iii)  providing  sub-accounting  relating  to the sale of a Fund's  shares
beneficially  owned  by  Customers  or  the  information  to RBB  necessary  for
sub-accounting.  The Board of Directors of RBB has approved a Distribution  Plan
(the 'Plan')  pursuant to Rule 12b-1 under the 1940 Act under which  Counsellors
Securities may pay each participating  Service  Organization a negotiated fee on
an annual  basis not to exceed  .75%,  in each case of the value of the  average
daily net assets of its  Customers  invested  in the  Series 2 Shares.  However,
under the current Distribution  Agreement between Counsellors Securities and RBB
on behalf of the  Funds,  such fee shall not exceed  .50% of  average  daily net
assets of  Customers.  Each Fund  may,  in the  future,  enter  into  additional
Agreements  with  Service  Organizations.  The  Board of  Directors  of RBB will
evaluate the appropriateness of the Plan on a continuing basis.
 
     No Load Shares may be sold to or through institutions that will not be paid
a distribution fee by the  Funds pursuant to Rule 12b-1  under the 1940 Act  for
services  to their  clients or  customers who are  beneficial owners  of No Load
Shares. These institutions may be paid a  fee by the Funds for transfer  agency,
administrative  or other services  provided to their customers  that invest in a
Fund's No  Load  Shares. These  services  include maintaining  account  records,
processing orders to purchase, redeem and exchange No Load Shares and responding
to  certain customer inquiries. WPC and Counsellors Securities may, from time to
time, at their own expense, also provide compensation to these institutions.  To
the  extent  they do  so,  such compensation  does  not represent  an additional
expense to the  Funds or  their shareholders,  since it  will be  paid from  the
assets   of  WPC,  Counsellors  Securities   or  their  affiliates.  Counsellors
Securities receives a fee equal to an  annual rate of .25% of the average  daily
net  assets of the Balanced Fund's No Load Shares for distribution services. See
'Management -- Distributor.'
 
DESCRIPTION OF SHARES
 
     RBB has authorized  capital of thirty billion shares of Common Stock, $.001
par value per share,  of which 10.7 billion  shares are currently  classified as
follows:  100 million  shares are classified as Class A Common Stock (Growth and
Income),  100 million shares are classified as Class B Common Stock, 100 million
shares are classified as Class C Common Stock (Balanced), 100 million shares are
classified as Class D Common Stock (Tax-Free), 500 million shares are classified
as Class E Common Stock  (Money),  500 million  shares are classified as Class F
Common Stock  (Municipal  Money),  500 million  shares are classified as Class G
Common Stock (Money),  500 million shares are classified as Class H Common Stock
(Municipal  Money),  1 billion  shares are  classified  as Class I Common  Stock
(Money),  500 million shares are  classified as Class J Common Stock  (Municipal
Money),  500  million  shares  are  classified  as  Class K Common  Stock  (U.S.
Government  Money),  1,500 million shares are classified as Class L Common Stock
(Money),  500 million shares are  classified as Class M Common Stock  (Municipal
Money),  500  million  shares  are  classified  as  Class N Common  Stock  (U.S.
Government  Money),  500 million  shares are  classified as Class O Common Stock
(N.Y.  Money),  100  million  shares  are  classified  as Class P  Common  Stock
(Government),  100 million  shares are  classified as Class Q Common Stock,  500
million shares are  classified as Class R Common Stock  (Municipal  Money),  500
million shares are classified as Class S Common Stock (U.S.  Government  Money),
500 million shares are classified as Class T Common Stock  (International),  500
million shares are classified as Class U Common Stock  (Strategic),  500 million
shares are classified as Class V Common Stock (Emerging), 100 million shares are
classified as Class W Common Stock (Laffer/Canto  Equity), 50 million shares are
classified  as Class X Common Stock (U.S.  Core Equity),  50 million  shares are
classified as



                                       25
<PAGE>


Class Y Common Stock (U.S. Core Fixed-Income),  50 million shares are classified
as Class Z Common Stock  (International  Fixed  Income),  50 million  shares are
classified  as Class AA Common Stock  (Municipal  Bond),  50 million  shares are
classified as Class BB Common Stock (Balanced), 50 million shares are classified
as Class CC Common Stock (Short Duration),  100 million shares are classified as
Class DD Common  Stock  (Growth & Income  Series  2),  100  million  shares  are
classified as Class EE Common Stock  (Balanced  Series 2), 1 million  shares are
classified  as  Class  Alpha 1  Common  Stock  (Money),  1  million  shares  are
classified as Class Alpha 2 Common Stock (Municipal Money), 1 million shares are
classified  as Class Alpha 3 Common  Stock (U.S.  Government  Money),  1 million
shares are  classified  as Class Alpha 4 Common  Stock (N.Y.  Money),  1 million
shares are classified as Class Beta 1 Common Stock (Money), 1 million shares are
classified as Class Beta 2 Common Stock (Municipal  Money), 1 million shares are
classified  as Class Beta 3 Common  Stock  (U.S.  Government  Money),  1 million
shares are  classified  as Class Beta 4 Common  Stock  (N.Y.  Money),  1 million
shares are  classified  as Gamma 1 Common Stock  (Money),  1 million  shares are
classified  as Gamma 2 Common  Stock  (Municipal  Money),  1 million  shares are
classified as Gamma 3 Common Stock (U.S. Government Money), 1 million shares are
classified as Gamma 4 Common Stock (N.Y. Money), 1 million shares are classified
as Delta 1 Common Stock  (Money),  1 million  shares are  classified  as Delta 2
Common Stock  (Municipal  Money),  1 million  shares are  classified  as Delta 3
Common Stock (U.S. Government Money), 1 million shares are classified as Delta 4
Common Stock (N.Y.  Money),  1 million shares are classified as Epsilon 1 Common
Stock  (Money),  1 million  shares  are  classified  as  Epsilon 2 Common  Stock
(Municipal  Money),  1 million  shares are  classified as Epsilon 3 Common Stock
(U.S.  Government  Money),  1 million  shares are classified as Epsilon 4 Common
Stock (N.Y.  Money),  1 million  shares are  classified  as Zeta 1 Common  Stock
(Money),  1 million  shares are  classified  as Zeta 2 Common  Stock  (Municipal
Money), 1 million shares are classified as Zeta 3 Common Stock (U.S.  Government
Money),  1 million shares are classified as Zeta 4 Common Stock (N.Y.  Money), 1
million shares are  classified as Eta 1 Common Stock  (Money),  1 million shares
are  classified as Eta 2 Common Stock  (Municipal  Money),  1 million shares are
classified as Eta 3 Common Stock (U.S.  Government  Money), 1 million shares are
classified as Eta 4 Common Stock (N.Y.  Money),  1 million shares are classified
as Theta 1 Common Stock  (Money),  1 million  shares are  classified  as Theta 2
Common Stock  (Municipal  Money),  1 million  shares are  classified  as Theta 3
Common Stock (U.S.  Government  Money),  and 1 million  shares are classified as
Theta 4 Common Stock (N.Y. Money).  Shares of Class A, C, DD and EE Common Stock
constitute the RBB Classes offered by this Prospectus.  Under RBB's charter, the
Board of Directors has the power to classify or reclassify  any unissued  shares
of Common Stock from time to time.
 
     The  classes  of Common  Stock  have been  grouped  into  sixteen  separate
'families':  the RBB Family,  the Warburg Pincus Family,  the Cash  Preservation
Family,  the Sansom Street Family,  the Bedford Family, the Bradford Family, the
BEA Family,  the Laffer/Canto  Equity,  the Alpha Family,  the Beta Family,  the
Gamma Family,  the Delta Family,  the Epsilon Family,  the Zeta Family,  the Eta
Family  and  the  Theta  Family.  The RBB  Family  represents  interests  in two
non-money  market  portfolios  as well as the Money Market and  Municipal  Money
Market  Portfolios.  The Cash Preservation  Family  represents  interests in the
Money  Market  and  Municipal  Money  Market  Funds;  the Sansom  Street  Family
represents interests in the Money Market,  Municipal Money Market and Government
Obliga



                                       26
<PAGE>


tions Money Market Funds; the Bedford Family  represents  interests in the Money
Market, Municipal Money Market, Government Obligations Money Market and New York
Municipal Money Market Funds;  the Bradford Family  represents  interests in the
Municipal Money Market and Government  Obligations  Money Market Funds;  the BEA
Family   represents   interests  in  nine  non-money  market   portfolios;   the
Laffer/Canto  Equity  represents  interests  in  the  Laffer/Canto  Equity  Fund
Portfolio;  and the Alpha,  Beta,  Gamma,  Delta,  Epsilon,  Zeta, Eta and Theta
Families  (collectively,  the 'Additional  Families') represent interests in the
Money Market,  Municipal Money Market,  Government  Obligations Money Market and
New York Municipal Money Market Portfolios.
 
     THIS  PROSPECTUS AND  THE STATEMENT OF  ADDITIONAL INFORMATION INCORPORATED
HEREIN RELATE PRIMARILY TO  THE WARBURG PINCUS GROWTH  & INCOME CLASSES AND  THE
WARBURG  PINCUS BALANCED CLASSES AND DESCRIBE  ONLY THE INVESTMENT OBJECTIVE AND
POLICIES, OPERATIONS, CONTRACTS AND OTHER MATTERS RELATING TO THE WARBURG PINCUS
GROWTH & INCOME AND BALANCED CLASSES.
 
     Each share  that  represents  an  interest in  a  portfolio  has  an  equal
proportionate interest in the assets belonging to such portfolio with each other
share  that represents an interest  in such portfolio, even  where a share has a
different class designation than another share representing an interest in  that
Fund. Shares of RBB do not have preemptive or conversion rights. When issued for
payment  as  described  in  this  Prospectus,  Shares  will  be  fully  paid and
non-assessable.
 
     RBB currently  does not  intend  to hold  annual meetings  of  shareholders
except  as  required by  the 1940  Act or  other applicable  law. The  law under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors. To the  extent
required by law, RBB will assist in shareholder communication in such matters.
 
     Shareholders of all investment portfolios of RBB (including the Funds) will
vote  in the aggregate and not by  portfolio except as otherwise required by law
or when the  Board of  Directors determines  that the  matter to  be voted  upon
affects  only  the  interests of  the  shareholders of  a  particular investment
portfolio. (See  the  Statement  of  Additional  Information  under  'Additional
Information  Concerning Fund  Shares' for  examples when  the 1940  Act requires
voting by investment portfolio or by class.) Shareholders of RBB are entitled to
one vote  for each  full share  held (irrespective  of class  or portfolio)  and
fractional  votes for fractional  shares held. Voting  rights are not cumulative
and, accordingly, the holders of more than 50% of the aggregate shares of Common
Stock of RBB may elect all of the directors.
 
     As of September 30, 1994, to the Fund's knowledge, no person held of record
or  beneficially  25% or more of the  outstanding  shares of all  classes of the
Fund, although as of such date Home Insurance Company owned more than 25% of the
outstanding  shares of the RBB  Family  Classes  representing  interests  in the
Government  Securities  Portfolio;  Seymour  Fein  owned  more  than  25% of the
outstanding  shares of the RBB Family  Class  representing  an  interest  in the
Municipal  Money Market;  Boston  Financial Data Services owned more than 25% of
the  outstanding  shares of Warburg Pincus Class  representing  interests in the
Growth & Income Fund;  Planco Inc. Profit Sharing Plan Trust owned more than 25%
of the outstanding shares of Warburg Pincus Class representing  interests in the
Balanced  Fund;  E. M.  Warburg  Pincus & Co.,  Inc.  owned more than 25% of the
outstanding  shares of Warburg  Pincus  representing  interests  in the Balanced
Fund; the Jewish Family and Children's  Agency of Philadelphia  Capital Campaign
owned more than 25% of the  outstanding  shares of the Cash  Preservation  Class
representing  an interest in the Money Market  Portfolio;  the Crowe Trust owned
more than 25% of the outstanding shares of the Cash Preservation



                                       27
<PAGE>


Class representing an interest in the Municipal Money Market Portfolio; Wasner &
Co for account of Paine Webber  Managed Assets -- Sundry Holding owned more than
25% of the outstanding  shares of the Sansom Street Family Class representing an
interest  in  the  Money  Market  Portfolio;   the  State  of  Oregon,  Treasury
Department,  owned  more than 25% of the  outstanding  Shares of the BEA  Family
Class representing an interest in the BEA Strategic Fixed Income Portfolio;  the
Bank of New York owned more than 25% of the outstanding Shares of the BEA Family
Class  representing an interest in the BEA U.S. Core Equity  Portfolio;  the New
England UFCW and  Employers'  Pension Fund Board of Trustees owned more than 25%
of the  outstanding  Shares of the BEA Family Class  representing an interest in
the BEA U.S.  Core  Fixed  Income  Portfolio;  Bankers  Trust on  behalf  of the
Pechiney Corporation Pension Master Trust owned more than 25% of the outstanding
Shares of the BEA Family  Class  representing  an interest in the BEA U.S.  Core
Fixed  Income  Portfolio;  the  Bank of New  York  as  trustee  for the  Eastern
Enterprises  Retirement Plan Trust owned more than 25% of the outstanding Shares
of the BEA Family Class  representing an interest in the BEA Global Fixed Income
Portfolio; and John Hancock Clearing Corporation Special Custody Account for the
Exclusive Benefit of Customers owned more than 25% of the outstanding  shares of
the  Laffer/Canto  Equity  Class  representing  an interest in the  Laffer/Canto
Equity Portfolio. OTHER INFORMATION
 
REPORTS  AND INQUIRIES. Shareholders will  receive unaudited semi-annual reports
describing RBB's investment operations  and annual financial statements  audited
by  independent  accountants. Shareholder  inquiries can  be made  by contacting
Warburg Pincus Funds at (800) 888-6878,  or by writing to Warburg Pincus  Funds,
P.O. Box 9030, Boston, Massachusetts 02205-9030.
 
SHARE  CERTIFICATES. RBB will issue share certificates for the Classes only upon
the written request of  a shareholder sent to  PFPC. Share certificates are  not
available for shares purchased through Warburg Pincus.
 
PERFORMANCE  INFORMATION.  From  time to  time,  the Funds  may  advertise their
performance, including comparisons to other mutual funds with similar investment
objectives and to stock or other relevant indices. All such advertisements  will
show the average annual total return, net of a Fund's maximum sales charge, over
one, five and ten year periods or, if such periods have not yet elapsed, shorter
periods corresponding to the life of the Fund. Such total return quotations will
be  computed by finding the compounded average annual total return for each time
period that would equate the assumed initial investment of $1,000 to the  ending
redeemable value, according to a required standardized calculation. The standard
calculation  is required by the SEC  to provide consistency and comparability in
investment company advertising. The Funds may also from time to time include  in
such  advertising an aggregate total return figure or a total return figure that
is not calculated according to the standardized formula in order to compare more
accurately a Fund's performance  with other measures  of investment return.  For
example,  a  portfolio's total  return may  be compared  with data  published by
Lipper  Analytical  Services,  Inc.,   CDA  Investment  Technologies,  Inc.   or
Weisenberger Investment Company Service, or with the performance of the Standard
& Poor's 500 Stock Index or the Dow Jones Industrial Average. All advertisements
containing   performance  data  will  include  a  legend  disclosing  that  such
performance data represent past performance  and that the investment return  and
principal  value of an  investment will fluctuate so  that an investor's Shares,
when redeemed, may be worth more or less than their original cost.
 
     From time to time, the Funds  may also advertise their '30-day yield.'  The
yield  refers to the income generated by an investment in a 



                                       28
<PAGE>


Fund over the 30-day period identified in the advertisement,  and is computed by
dividing  the net  investment  income per share during the period by the maximum
public  offering  price per share of the last day of the period.  This income is
'annualized'  by assuming that the amount of income is generated each month over
a one-year period and is compounded semi-annually. The annualized income is then
shown as a percentage of the net asset value.
 
     The yield on  Shares of the  Funds will fluctuate  and are not  necessarily
representative  of future  results. Shareholders  should remember  that yield is
generally a  function of  portfolio quality  and maturity,  type of  instrument,
operating  expenses and  market conditions.  Any fees  charged by broker/dealers
directly to their customers in connection with investments in the Funds are  not
reflected  in the  yields on a  Fund's Shares,  and such fees,  if charged, will
reduce the actual return received by shareholders on their investments.
 
     In reports or other communications to  investors or in advertising, a  Fund
may  also describe  the general  biography or  work experience  of the portfolio
managers of the Fund  and may include quotations  attributable to the  portfolio
managers  describing approaches taken in managing a Fund's investments, research
methodology underlying stock selection or a Fund's investment objective. A  Fund
may  also  discuss  the  continuum  of risk  and  return  relating  to different
investments and the potential impact of foreign stocks on a portfolio  otherwise
composed  of domestic  securities. In  addition, a  Fund may  from time  to time
compare  its  expense  ratio  to  that  of  investment  companies  with  similar
objectives  and policies, based on data generated by Lipper Analytical Services,
Inc. or similar investment services that monitor mutual funds.
 
NO  PERSON  HAS   BEEN  AUTHORIZED  TO   GIVE  ANY  INFORMATION   OR  MAKE   ANY
REPRESENTATIONS  NOT  CONTAINED  IN THIS  PROSPECTUS  OR IN  RBB'S  STATEMENT OF
ADDITIONAL INFORMATION INCORPORATED HEREIN BY  REFERENCE IN CONNECTION WITH  THE
OFFERING  MADE BY  THIS PROSPECTUS AND,  IF GIVEN OR  MADE, SUCH REPRESENTATIONS
MUST NOT BE RELIED  UPON AS HAVING  BEEN AUTHORIZED BY  RBB OR ITS  DISTRIBUTOR.
THIS  PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY RBB OR BY THE DISTRIBUTOR IN
ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY BE MADE.
                      ------------------------------------
 
                                       29

<PAGE>
                                                                      APPENDIX A
 
                           RATINGS OF DEBT SECURITIES
                         STANDARD & POOR'S CORPORATION
 
<TABLE>
<S>               <C>
AAA               Debt  rated 'AAA' has the highest rating assigned by Standard & Poor's. Capacity to pay interest
                  and repay principal is extremely strong.
 
AA                Debt rated 'AA' has a very strong capacity to pay interest and repay principal and differs  from
                  the highest rated issues only in a small degree.
 
A                 Debt rated 'A' has a strong capacity to pay interest and repay principal although it is somewhat
                  more susceptible to the adverse effects of changes in circumstances and economic conditions than
                  debt in higher rated categories.
 
BBB               Debt rated 'BBB' is regarded as having an adequate capacity to pay interest and repay principal.
                  Whereas  it normally  exhibits adequate  protection parameters,  adverse economic  conditions or
                  changing circumstances are more likely to lead to a weakened capacity to pay interest and  repay
                  principal for debt in this category than in higher rated categories.
 
BB                Debt  rated 'BB', 'B', 'CCC', or 'CC' is regarded, on balance, as predominantly speculative with
B                 respect to capacity  to pay interest  and repay principal  in accordance with  the terms of  the
CCC               obligation.  'BB' indicates  the lowest  degree of  speculation and  'CC' the  highest degree of
CC                speculation. While such debt will likely have some quality and protective characteristics, these
                  are outweighed by large uncertainties or major risk exposures to adverse conditions.
 
C                 This rating is reserved for income bonds on which no interest is being paid.
 
D                 Debt rated 'D'  is in  default, and  payment of  interest and/or  repayment of  principal is  in
                  arrears.
 
(+) OR (-)        The  ratings from 'AAA' or 'CCC' may be modified by the addition of a plus or minus sign to show
                  relative standing or within the major rating categories.
 
*                 Continuance of the rating  is contingent upon S&P's  receipt of an executed  copy of the  escrow
                  agreement or closing documentation confirming investments and cash flows.
 
NR                Indicates  no rating has been requested, that there is insufficient information on which to base
                  a rating, or that S&P does not rate a particular type of obligation as a matter of policy.
 
                  DEBT OBLIGATIONS OF ISSUERS OUTSIDE THE UNITED STATES AND ITS TERRITORIES are rated on the  same
                  basis  as domestic corporate and  municipal issues. The ratings  measure the creditworthiness of
                  the obligor but do not take into account currency exchange and related uncertainties.
</TABLE>
 
                                      A-1
 
<PAGE>
<TABLE>
<S>               <C>
p                 PROVISIONAL RATINGS: The  letter 'p'  indicates that the  rating is  provisional. A  provisional
                  rating  assumes the successful completion of the project  being financed by the debt being rated
                  and indicates that payment of  debt service requirements is  largely or entirely dependent  upon
                  the  successful and  timely completion  of the project.  This rating,  however, while addressing
                  credit quality subsequent to completion of the  project, makes no comment on the likelihood  of.
                  or  the risk of default upon failure of,  such completion. The investor should exercise judgment
                  with respect to such likelihood and risk.
</TABLE>
 
NOTES
 
     Note rating symbols are as follows:
 
<TABLE>
<S>               <C>
SP-1              Very strong or strong capacity to pay principal and interest. Those issues determined to possess
                  overwhelming safety characteristics will be given a plus (+) designation.
SP-2              Satisfactory capacity to pay principal and interest.
SP-3              Speculative capacity to pay principal and interest.
</TABLE>
 
COMMERCIAL PAPER
 
     A Standard & Poor's commercial paper rating is a current assessment of  the
likelihood of timely payment of debt having an original maturity of no more than
365 days.
 
     Ratings  are graded into four categories,  ranging from 'A' for the highest
quality obligations to 'D' for the lowest. The four categories are as follows:
 
<TABLE>
<S>               <C>
A                 Issues assigned this  highest rating are  regarded as  having the greatest  capacity for  timely
                  payment.  Issues in this category  are delineated with the  numbers 1, 2, and  3 to indicate the
                  relative degree of safety.
A-1               This designation  indicates  that  the degree  of  safety  regarding timely  payment  is  either
                  overwhelming   or  very  strong.   Those  issues  determined   to  possess  overwhelming  safety
                  characteristics are denoted with a plus (+) sign designation.
A-2               Capacity for timely payment  on issues with  this designation is  strong. However, the  relative
                  degree of safety is not as high as for issues designated 'A-1'.
A-3               Issues  carrying this  designation have  a satisfactory capacity  for timely  payment. They are,
                  however, somewhat  more vulnerable  to the  adverse  effects of  changes in  circumstances  than
                  obligations carrying the higher designations.
B                 Issues  rated 'B' are regarded as having only  an adequate capacity for timely payment. However,
                  such capacity may be damaged by changing conditions or short-term adversities.
C                 This rating is assigned to short-term debt obligations with a doubtful capacity for payment.
D                 This rating indicates that the issue is either in  default or is expected to be in default  upon
                  maturity.
</TABLE>
 
                                      A-2
 
<PAGE>
VARIABLE RATE DEMAND BONDS
 
     Standard  & Poor's assigns 'dual' ratings to all long-term debt issues that
have as part of their provisions a  long-term rating and a variable rate  demand
rating.  The first rating addresses the likelihood of repayment of principal and
interest due  and the  second  rating addresses  only  the demand  feature.  The
long-term  debt  rating  symbols are  used  for  bonds to  denote  the long-term
maturity and the  commercial paper  rating symbols are  used to  denote the  put
option (for example, 'AAA/A-1 +'). If the nominal maturity is short (three years
or less), a note rating is assigned.
 
                    MOODY'S INVESTORS SERVICE, INC. RATINGS
 
CORPORATE BONDS
 
                                      Aaa
 
     Bonds which are rated Aaa are judged to be the best quality. They carry the
smallest degree of investment risk and are generally referred to as 'gilt edge.'
Interest  payments are protected by a large or by an exceptionally stable margin
and principal is  secure. While the  various protective elements  are likely  to
change,  such  changes as  can be  visualized  are most  unlikely to  impair the
fundamentally strong position of such issues.
 
                                       Aa
 
     Bonds which are rated Aa are judged to be of high quality by all standards.
Together with the Aaa group they comprise what are generally known as high grade
bonds. They are rated  lower than the best  bonds because margins of  protection
may  not be as large as in  Aaa securities or fluctuation of protective elements
may be of greater amplitude  or there may be  other elements present which  make
the long term risks appear somewhat larger than in Aaa securities.
 
                                       A
 
     Bonds  which are rated  A possess many  favorable investment attributes and
are to be considered as upper medium grade obligations. Factors giving  security
to  principal and interest  are considered adequate but  elements may be present
which suggest a susceptibility to impairment sometime in the future.
 
                                      Baa
 
     Bonds which are rated Baa are considered as medium grade obligations, i.e.,
they are  neither highly  protected nor  poorly scecured.  Interest payment  and
principal  security  appear  adequate  for the  present  but  certain protective
elements may be lacking or may  be characteristically unreliable over any  great
length  of time. Such  bonds lack outstanding  investment characteristics and in
fact have speculative characteristics as well.
 
                                       Ba
 
     Bonds which are  rated Ba are  judged to have  speculative elements;  their
future  cannot be considered  as well assured. Often  the protection of interest
and principal payments may be very
 
                                      A-3
 
<PAGE>
moderate and thereby not  well safeguarded during both  good and bad times  over
the future. Uncertainty of position characterizes bonds in this class.
 
                                       B
 
     Bonds  which are  rated B generally  lack characteristics  of the desirable
investment. Assurance of interest  and principal payments  or of maintenance  of
other terms of the contract over any long period of time may be small.
 
                                      Caa
 
     Bonds  which are  rated Caa  are of  poor standing.  Such issues  may be in
default or there may be present elements of danger with respect to principal  or
interest.
 
                                       Ca
 
     Bonds  which are rated Ca represent  obligations which are speculative in a
high degree. Such issues are often in default or have other marked shortcomings.
 
                                       C
 
     Bonds which are rated C are the  lowest rated class of bonds and issues  so
rated  can be regarded as having extremely  poor prospects of ever attaining any
real investment standing.
 
     Moody's bond  ratings, where  specified, are  also applied  to senior  bank
obligations  with an  original maturity  in excess of  one year.  Among the bank
obligations covered are  bank deposits,  bankers acceptance  and obligations  to
deliver  foreign exchange. Obligations  relying upon support  mechanisms such as
letters-of-credit are excluded unless explicitly rated.
 
     NOTE: Moody's  applies numerical  modifiers, 1,  2 and  3 in  each  generic
rating classification from Aa through B in its corporate bond rating system. The
modifier  1 indicates that the  security ranks in the  higher end of its generic
rating category; the modifier 2 indicates a mid-range ranking; and the  modifier
3  indicates  that  the issue  ranks  in the  lower  end of  its  generic rating
category.
 
SHORT-TERM NOTES AND VARIABLE RATE DEMAND OBLIGATIONS
 
     The following summarizes the ratings  used by Moody's for short-term  notes
and variable rate demand obligations:
 
          MIG-1/VMIG-1.  Obligations bearing these designations  are of the best
     quality, enjoying  strong protection  by established  cash flows,  superior
     liquidity  support  or demonstrated  broad-based access  to the  market for
     refinancing.
 
          MIG-2/VMIG-2. Obligations  bearing  these  designations  are  of  high
     quality  with margins of protection  ample although not as  large as in the
     preceding group.
 
          MIG-3/VMIG-3. Obligations bearing these designations are of  favorable
     quality. All security elements are accounted for but there is a lacking the
     undeniable  strength  of  the  preceding grades.  Liquidity  and  cash flow
     protection may be narrow and market access for refinancing is hereby to  be
     less well established.
 
                                      A-4

<PAGE>
COMMERCIAL PAPER RATINGS
 
     The  rating  PRIME-1 is  the highest  commercial  paper rating  assigned by
Moody's.  Issuers  rated  PRIME-1  (or  related  supporting  institutions)   are
considered  to have a superior capacity  for repayment of senior short-term debt
obligations. Issuers  rated PRIME-2  (or  related supporting  institutions)  are
considered  to  have strong  capacity for  repayment  of senior  short-term debt
obligations. This will normally be evidenced  by many of the characteristics  of
issuers  rated  PRIME-1 but  to a  lesser degree.  Earnings trends  and coverage
ratios,  while  sound,  will  be  more  subject  to  variation.   Capitalization
characteristics,  while  still appropriate,  may  be more  affected  by external
conditions.  Ample  alternate  liquidity  is  maintained.  Issuers  PRIME-3  (or
supporting  institutions)  have an  acceptable capacity  rated for  repayment of
senior short-term debt obligations. The  effect of industry characteristics  and
market   composition  may  be  more  pronounced.  Variability  in  earnings  and
profitability may result in changes in the level of debt protection measurements
and may require relatively high financial leverage. Adequate alternate liquidity
is maintained. Issuers  rated NOT  PRIME do  not fall  within any  of the  Prime
rating categories.
 
                                      A-5
<PAGE>
                               TABLE OF CONTENTS
 
  FINANCIAL HIGHLIGHTS ..................................................... 5
  INVESTMENT OBJECTIVES AND POLICIES ....................................... 7
  INVESTMENT LIMITATIONS .................................................. 14
  MANAGEMENT .............................................................. 15
  DISTRIBUTION OF SHARES .................................................. 17
  HOW TO PURCHASE SHARES .................................................. 17
  HOW TO REDEEM AND EXCHANGE SHARES ....................................... 20
  NET ASSET VALUE ......................................................... 23
  DIVIDENDS AND DISTRIBUTIONS ............................................. 23
  TAXES ................................................................... 23
  SHAREHOLDER SERVICING ................................................... 24
  DESCRIPTION OF SHARES ................................................... 25
  OTHER INFORMATION ....................................................... 28
 
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                               DECEMBER 28, 1994 






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