WARBURG PINCUS TAX FREE FUND INC
497, 1996-03-12
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                      WARBURG PINCUS GROWTH & INCOME FUND
                          WARBURG PINCUS BALANCED FUND
                          WARBURG PINCUS TAX FREE FUND
                                       OF
                               THE RBB FUND, INC.
 
                              --------------------
 
                             YOUR VOTE IS IMPORTANT
 
DEAR SHAREHOLDER:
 
     The  Board of Directors of The RBB Fund, Inc. (the 'RBB Fund') has recently
reviewed and unanimously endorsed proposals  for the reorganization of three  of
its  investment series  -- Warburg Pincus  Growth & Income  Fund, Warburg Pincus
Balanced Fund and Warburg Pincus Tax Free Fund (each, an 'Existing Warburg Fund'
and, collectively,  the  'Existing  Warburg  Funds'). UNDER  THE  TERMS  OF  THE
PROPOSALS,  EACH OF THREE  NEWLY FORMED INVESTMENT  COMPANIES -- WARBURG, PINCUS
GROWTH & INCOME  FUND, INC., WARBURG,  PINCUS BALANCED FUND,  INC. AND  WARBURG,
PINCUS  TAX FREE FUND, INC.  (EACH, A 'NEW WARBURG  FUND,' AND COLLECTIVELY, THE
'NEW WARBURG FUNDS') -- WOULD ACQUIRE ALL OR SUBSTANTIALLY ALL OF THE ASSETS AND
LIABILITIES OF THE EXISTING WARBURG FUND WITH A SIMILAR NAME. We are pleased  to
invite  you to attend a  special meeting (the 'Meeting')  of the shareholders of
each Existing Warburg Fund to consider the approval of an Agreement and Plan  of
Reorganization  (the 'Plan') pursuant  to which the  reorganization of your Fund
(the 'Reorganization') would be effected.
 
     Your Board of Directors and Warburg, Pincus Counsellors, Inc.  ('Warburg'),
each  Fund's investment adviser, believe that  the Reorganization is in the best
interests of each Existing Warburg Fund and its shareholders. It will  integrate
the  Existing Warburg Funds fully into the Warburg Pincus Funds family, thereby,
among other  things, reducing  confusion  in the  marketplace and  reducing  the
possibility   of  inconsistencies  in  operations,  and  may  generate  economic
efficiencies as well.
 
     The Reorganization  will  not  result  in any  changes  to  the  investment
philosophy  or operations of your Fund, since each New Warburg Fund has the same
investment objective  and  substantially  similar  investment  policies  as  the
corresponding  Existing Warburg Fund.  Each New Warburg Fund  will have the same
investment  adviser,  administrators,  custodian  and  transfer  agent  as   the
corresponding  Existing Warburg  Fund. In addition,  Counsellors Securities Inc.
(each Fund's distributor) and PFPC Inc. (each Fund's co-administrator) (or their
affiliates), have agreed to waive fees  and reimburse expenses for the  one-year
period  following the closing of the  Reorganization (the 'Closing Date') to the
extent necessary for the  net expense ratio  of each New Warburg  Fund to be  no
higher  than the average of that of  the corresponding Existing Warburg Fund for
the thirty days ending on the Closing Date.
 
     If shareholders  of  an  Existing  Warburg  Fund  approve  the  Plan,  upon
consummation  of the Reorganization of that Fund, the Existing Warburg Fund will
be liquidated. You will  become a shareholder of  the corresponding New  Warburg
Fund,  having received shares of the same class with an aggregate value equal to
the aggregate net asset value of your investment in the Existing Warburg Fund at
the time of the transaction. No sales charge will be imposed in the transaction.
The transactions will, in  the opinion of counsel,  be free from federal  income
taxes  to you, the Existing Warburg Funds  and the New Warburg Funds. Warburg or
its  affiliates  will  bear  all  expenses  incurred  in  connection  with  each
Reorganization.
 
     The  Meeting will be held  on May 1, 1996  to consider this transaction. WE
STRONGLY INVITE YOUR PARTICIPATION BY ASKING YOU TO REVIEW, COMPLETE AND  RETURN
YOUR PROXY PROMPTLY. If you own shares of more than one Existing Warburg Fund, a
separate proxy card is enclosed for each.
 
     Detailed  information about the proposed reorganization is described in the
attached combined  prospectus/proxy  statement.  YOUR  BOARD  OF  DIRECTORS  HAS
UNANIMOUSLY  APPROVED  THE  REORGANIZATION  OF EACH  EXISTING  WARBURG  FUND AND
RECOMMENDS
 


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THAT YOU VOTE TO APPROVE THE PLAN. On behalf of the Board of Directors, I  thank
you for your participation as a shareholder and urge you to please exercise your
right  to vote by completing,  dating and signing the  enclosed proxy card(s). A
self-addressed, postage-paid envelope has been enclosed for your convenience; if
you prefer,  you can  fax the  proxy card  to D.F.  King &  Co., Inc.  at  (212)
809-8839.
 
     If  you have  any questions  regarding the  proposed reorganization, please
feel free to call 1(800) 755-3107, where an individual will be pleased to assist
you.
 
     IT IS VERY IMPORTANT THAT YOUR VOTING INSTRUCTIONS BE RECEIVED PROMPTLY.
 
                                          Sincerely,
 
                                          DONALD VAN RODEN
                                          Chairman of the Board
 
March 7, 1996


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                             QUESTIONS AND ANSWERS
 
Q.) WHAT ISSUE AM I BEING ASKED TO VOTE ON?
 
A.) You  are being asked  to approve a proposed  Reorganization of your Existing
    Warburg Fund. As a result of the Reorganization, you will receive shares  of
    identical  value in a corresponding New Warburg Fund with a similar name and
    the same  investment objective  and portfolio  manager(s) as  your  Existing
    Warburg Fund.
 
Q.) IS THE PROPOSED REORGANIZATION IN MY BEST INTEREST?
 
A.) Yes.  Your Board of Directors and  Warburg, Pincus Counsellors, Inc. believe
    that the Reorganization is  in the best interests  of each Existing  Warburg
    Fund  and its  shareholders. It  will integrate  the Existing  Warburg Funds
    fully into the  Warburg Pincus  Funds family, thereby,  among other  things,
    reducing  confusion  in  the  marketplace and  reducing  the  possibility of
    inconsistencies in  operations.  The interest  of  the shareholders  of  the
    Existing   Warburg  Funds   will  not  be   diluted  as  a   result  of  the
    Reorganization.
 
Q.) WILL THERE BE ANY CHANGES IN THE INVESTMENT OBJECTIVES
     AS A RESULT OF THE PROPOSED REORGANIZATION?
 
A.) The Reorganization  will  not  result  in  any  changes  to  the  investment
    philosophy  or operations of your Fund, since  each New Warburg Fund has the
    same investment objective as the  corresponding Existing Warburg Fund.  Each
    New  Warburg Fund will  have the same  portfolio manager(s), administrators,
    custodian and transfer agent as the corresponding Existing Warburg Fund.
 
Q.) ARE THERE ANY FEDERAL INCOME TAX CONSEQUENCES
     AS A RESULT OF THE PROPOSED REORGANIZATION?
 
A.) No. As a result of the Reorganization, no gain or loss will be recognized by
    an Existing  Warburg  Fund  or  its  shareholders  for  federal  income  tax
    purposes.
 
Q.) WHO WILL BEAR THE COSTS ASSOCIATED WITH THE PROPOSED REORGANIZATION?
 
A.) Warburg or its affiliates will bear all expenses incurred in connection with
    each Reorganization.
 
Q.) IS IT GOING TO COST ME MORE MONEY BECAUSE OF THE REORGANIZATION?
 
A.) No.  As  indicated in  the proxy  material, there  is no  change in  fees or
    expenses.
 
Q.) HOW DO I VOTE MY SHARES?
 
A.) You can vote your shares by  signing, dating and mailing the enclosed  proxy
    card in the postage paid envelope. If you prefer, you can fax the proxy card
    to  D.F. King &  Co., Inc. at (212)  809-8839. If you  have any questions or
    need any assistance please call our proxy solicitor, D.F. King & Co.,  Inc.,
    at 1(800) 755-3107.


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                               THE RBB FUND, INC.
                         BELLEVUE PARK CORPORATE CENTER
                              400 BELLEVUE PARKWAY
                                   SUITE 100
                           WILMINGTON, DELAWARE 19809
 
                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                           TO BE HELD ON MAY 1, 1996
 
     Notice  is  hereby  given  that  a  Special  Meeting  of  Shareholders (the
'Meeting') of Warburg Pincus Growth & Income Fund, Warburg Pincus Balanced  Fund
and  Warburg Pincus Tax Free Fund, each a  series of The RBB Fund, Inc., will be
held at the  offices of The  RBB Fund, Inc.,  400 Bellevue Parkway,  Wilmington,
Delaware  19809  on May  1,  1996, commencing  at  3:00 p.m.  for  the following
purposes:
 
          1. To approve or disapprove  the Agreement and Plan of  Reorganization
     dated  as of March 6, 1996 (the  'Plan') providing (i) that each of Warburg
     Pincus Growth  & Income  Fund,  Warburg Pincus  Balanced Fund  and  Warburg
     Pincus  Tax  Free  Fund  (individually  an  'Existing  Warburg  Fund'  and,
     together, the 'Existing Warburg Funds') would be reorganized from a  series
     of  The RBB  Fund, Inc.  into Warburg, Pincus  Growth &  Income Fund, Inc.,
     Warburg, Pincus  Balanced Fund,  Inc. and  Warburg, Pincus  Tax Free  Fund,
     Inc., respectively (individually a 'New Warburg Fund' and together the 'New
     Warburg  Funds'), (ii)  each Existing  Warburg Fund  would transfer  to the
     corresponding New Warburg Fund  all or substantially all  of its assets  in
     exchange  for  shares  of  the  New  Warburg  Fund  and  the  assumption of
     liabilities, and (iii) the distribution of  such shares of the New  Warburg
     Funds  to shareholders of the Existing  Warburg Funds in liquidation of the
     Existing Warburg Funds.
 
          2. To transact  such other business  as may properly  come before  the
     Meeting or any adjournment or adjournments thereof.
 
     THE  BOARD  OF  DIRECTORS  OF  THE  RBB  FUND  UNANIMOUSLY  RECOMMENDS THAT
SHAREHOLDERS OF EACH EXISTING WARBURG FUND VOTE TO APPROVE THE PLAN.
 
     The Board of Directors of the RBB  Fund has fixed the close of business  on
March  1, 1996 as the  record date for the  determination of shareholders of the
Existing Warburg Funds entitled to notice of and to vote at the Meeting and  any
adjournment or adjournments thereof.
 
     IT IS IMPORTANT THAT PROXIES BE RETURNED PROMPTLY.
 
     SHAREHOLDERS  WHO DO NOT EXPECT TO ATTEND  THE SPECIAL MEETING ARE URGED TO
(A) SIGN AND  RETURN WITHOUT DELAY  THE ENCLOSED PROXY  CARD(S) IN THE  ENCLOSED
ENVELOPE,  WHICH REQUIRES NO POSTAGE IF MAILED  IN THE UNITED STATES, OR (B) FAX
THE ENCLOSED PROXY CARD(S) TO D.F. KING  & CO., INC. AT (212) 809-8839, SO  THAT
THEIR  SHARES MAY  BE REPRESENTED  AT THE  MEETING. INSTRUCTIONS  FOR THE PROPER
EXECUTION OF PROXY CARDS  ARE SET FORTH  ON THE FOLLOWING  PAGE. PROXIES MAY  BE
REVOKED AT ANY TIME BEFORE THEY ARE EXERCISED BY
 


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THE  SUBSEQUENT EXECUTION AND  SUBMISSION OF A REVISED  PROXY, BY GIVING WRITTEN
NOTICE OF REVOCATION  TO THE  RBB FUND,  INC. AT ANY  TIME BEFORE  THE PROXY  IS
EXERCISED OR BY VOTING IN PERSON AT THE MEETING.
 
                                          By Order of the Board of Directors
 
                                          MORGAN R. JONES
                                          Secretary
 
March 7, 1996
 
     YOUR  PROMPT ATTENTION TO THE ENCLOSED PROXY WILL HELP TO AVOID THE EXPENSE
OF FURTHER SOLICITATION.
 



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                      INSTRUCTIONS FOR SIGNING PROXY CARDS
 
     The following general rules for signing proxy cards may be of assistance to
you and avoid the time and expense involved in validating your vote if you  fail
to sign your proxy card properly.
 
          1. Individual  Accounts: Sign your  name exactly as  it appears in the
             registration on the proxy card.
 
          2. Joint Accounts: Either party  may sign, but the  name of the  party
             signing   should  conform  exactly   to  the  name   shown  in  the
             registration on the proxy card.
 
          3. All Other  Accounts: The  capacity of  the individual  signing  the
             proxy  card should be indicated unless  it is reflected in the form
             of registration. For example:
 
<TABLE>
<CAPTION>
REGISTRATION                                                                     VALID SIGNATURES
- ------------                                                               -----------------------------
 
<S>            <C>                                                         <C>
CORPORATE ACCOUNTS
     (1)       ABC Corp. ...............................................   ABC Corp.
     (2)       ABC Corp. ...............................................   John Doe, Treasurer
     (3)       ABC Corp.
                 c/o John Doe, Treasurer................................   John Doe
     (4)       ABC Corp. Profit Sharing Plan............................   John Doe, Trustee
TRUST ACCOUNTS
     (1)       ABC Trust................................................   Jane B. Doe, Trustee
     (2)       Jane B. Doe, Trustee
                 u/t/d 12/28/78.........................................   Jane B. Doe
CUSTODIAL OR ESTATE ACCOUNTS
     (1)       John B. Smith, Cust.
                 f/b/o John B. Smith, Jr. UGMA..........................   John B. Smith
     (2)       John B. Smith............................................   John B. Smith, Jr., Executor
</TABLE>


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            COMBINED PROSPECTUS/PROXY STATEMENT DATED MARCH 7, 1996
                          ACQUISITION OF THE ASSETS OF
                      WARBURG PINCUS GROWTH & INCOME FUND
                          WARBURG PINCUS BALANCED FUND
                          WARBURG PINCUS TAX FREE FUND
                       SEPARATE INVESTMENT PORTFOLIOS OF
                               THE RBB FUND, INC.
                              400 BELLEVUE PARKWAY
                                   SUITE 100
                           WILMINGTON, DELAWARE 19809
                                 (302) 792-2555
                        BY AND IN EXCHANGE FOR SHARES OF
                   WARBURG, PINCUS GROWTH & INCOME FUND, INC.
                      WARBURG, PINCUS BALANCED FUND, INC.
                      WARBURG, PINCUS TAX FREE FUND, INC.
                              466 LEXINGTON AVENUE
                            NEW YORK, NEW YORK 10017
                                 1-800-888-6878
 
     This Combined Prospectus/Proxy Statement is being furnished to shareholders
of  Warburg Pincus Growth &  Income Fund (the 'Existing  Growth & Income Fund'),
Warburg Pincus Balanced Fund (the  'Existing Balanced Fund') and Warburg  Pincus
Tax Free Fund (the 'Existing Tax Free Fund,' together with the Existing Growth &
Income  Fund and Existing  Balanced Fund, the 'Existing  Warburg Funds,' each an
'Existing Warburg  Fund'), separate  series  of The  RBB  Fund, Inc.  (the  'RBB
Fund'),  in connection  with the proposed  Agreement and  Plan of Reorganization
(the 'Plan') to be submitted to  shareholders of each Existing Warburg Fund  for
consideration  at a Special Meeting of Shareholders to be held on May 1, 1996 at
3:00 p.m. (the 'Meeting'), at the offices  of The RBB Fund, Inc. located at  400
Bellevue Parkway, Wilmington, Delaware 19809, or any adjournment or adjournments
thereof.
 
     Each  of Warburg,  Pincus Growth  & Income  Fund, Inc.  (the 'New  Growth &
Income Fund'), Warburg, Pincus Balanced Fund, Inc. (the 'New Balanced Fund') and
Warburg, Pincus Tax Free Fund, Inc. (the  'New Tax Free Fund' and, with the  New
Growth  & Income Fund and the New Balanced Fund, the 'New Warburg Funds'; each a
'New Warburg Fund') is a newly organized registered investment company.
 
     The proposed reorganization pursuant  to the Plans will  not result in  any
change in the investment philosophy or operations of the Existing Warburg Funds.
The  investment objectives and policies of each New Warburg Fund are the same as
those of the corresponding  Existing Warburg Funds  except for minor  investment
policy  differences  described under  'Comparison  of Investment  Objectives and
Policies' in this Combined  Prospectus/Proxy Statement. The investment  adviser,
administrators,  custodian, transfer agent  and accountant for  each New Warburg
Fund are the same as those of the corresponding Existing Warburg Fund.
 
     The Plan provides for all or substantially all of the assets of an Existing
Warburg Fund to be  acquired by the corresponding  New Warburg Fund in  exchange
for  shares of the New Warburg Fund and  the assumption by such New Warburg Fund
of liabilities of the  Existing Warburg Fund (as  regards each Existing  Warburg
Fund,  hereinafter referred to as the  'Reorganization'). (The New Warburg Funds
and the Existing  Warburg Funds  are sometimes  referred to  hereinafter as  the
'Funds'  and individually as  a 'Fund.') Shares  of a New  Warburg Fund would be
distributed to  shareholders  of  the corresponding  Existing  Warburg  Fund  in
liquidation  of  the corresponding  Existing Warburg  Fund. As  a result  of the
proposed Reorganization,  each  shareholder of  an  Existing Warburg  Fund  will
receive  that number of shares  of the corresponding New  Warburg Fund having an
aggregate net asset  value equal to  the aggregate value  of such  shareholder's
shares of the Existing Warburg Fund immediately prior to the Reorganization. All
expenses  of the  Reorganization will be  borne by  Warburg, Pincus Counsellors,
Inc.
 


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('Warburg' or the 'Adviser'),  the investment adviser  of each Existing  Warburg
Fund and each New Warburg Fund. No sales charge will be imposed on the shares of
a  New Warburg Fund  received by the shareholders  of the corresponding Existing
Warburg Fund. This transaction is structured  to be tax-free for federal  income
tax  purposes to shareholders and to both the New Warburg Funds and the Existing
Warburg Funds.
 
     This Combined  Prospectus/Proxy Statement,  which  should be  retained  for
future  reference, sets  forth concisely the  information about  the New Warburg
Funds that  a prospective  investor  should know  before voting.  This  Combined
Prospectus/Proxy  Statement is expected  to first be sent  to shareholders on or
about March 8, 1996. A Statement of Additional Information dated March 7,  1996,
relating  to this  Combined Prospectus/Proxy Statement  and the Reorganizations,
has been filed with  the Securities and Exchange  Commission (the 'SEC') and  is
incorporated  by reference into this Combined Prospectus/Proxy Statement. A copy
of such Statement of  Additional Information is available  upon oral or  written
request  and without charge by  writing to the New  Warburg Funds at the address
listed on  the cover  page of  this Combined  Prospectus/Proxy Statement  or  by
calling 1-800-888-6878.
 
     The   following  documents,  which  have  been  filed  with  the  SEC,  are
incorporated herein in their entirety by reference.
 
          1. The Prospectus of each class  of shares offered by the New  Warburg
     Funds,  each dated March 4, 1996.  The New Warburg Fund Prospectus relating
     to each class of shares of each Existing Warburg Fund held by a shareholder
     accompanies this Combined Prospectus/Proxy Statement.
 
          2. The current Prospectuses of the RBB Fund on behalf of each class of
     Shares of the Existing Warburg Funds,  each dated December 29, 1995.  These
     may  be obtained without charge by writing to the address on the cover page
     of this Combined Prospectus/Proxy Statement or by calling 1-800-WARBURG.
 
          3. The Annual  Reports of the  Existing Warburg Funds  for the  fiscal
     year ended August 31, 1995.
 
     Accompanying  this Combined  Prospectus/Proxy Statement  as Exhibit  A is a
copy of the form of  Agreement and Plan of  Reorganization (the 'Plan') for  the
proposed Reorganizations.
 
     THESE  SECURITIES HAVE NOT  BEEN APPROVED OR  DISAPPROVED BY THE SECURITIES
AND  EXCHANGE  COMMISSION  OR  ANY  STATE  SECURITIES  COMMISSION  NOR  HAS  THE
SECURITIES  AND EXCHANGE  COMMISSION OR  ANY STATE  SECURITIES COMMISSION PASSED
UPON THE ACCURACY  OR ADEQUACY  OF THIS  PROSPECTUS. ANY  REPRESENTATION TO  THE
CONTRARY IS A CRIMINAL OFFENSE.
 
     NO  PERSON  HAS BEEN  AUTHORIZED TO  GIVE  ANY INFORMATION  OR TO  MAKE ANY
REPRESENTATIONS OTHER  THAN THOSE  CONTAINED IN  THIS COMBINED  PROSPECTUS/PROXY
STATEMENT  AND IN THE MATERIALS EXPRESSLY  INCORPORATED HEREIN BY REFERENCE AND,
IF GIVEN OR MADE, SUCH OTHER  INFORMATION OR REPRESENTATIONS MUST NOT BE  RELIED
UPON AS HAVING BEEN AUTHORIZED BY THE FUNDS.
 
                                       2
 


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                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                              PAGE
                                                                                                              ----
 
<S>                                                                                                           <C>
ADDITIONAL MATERIALS.......................................................................................     4
 
SUMMARY....................................................................................................     5
 
RISK FACTORS...............................................................................................     8
 
REASONS FOR THE REORGANIZATIONS............................................................................     8
 
FEE TABLES.................................................................................................     9
 
INFORMATION ABOUT THE REORGANIZATIONS......................................................................    12
 
COMPARISON OF INVESTMENT OBJECTIVES AND POLICIES...........................................................    15
 
MANAGEMENT OF THE FUND.....................................................................................    16
 
INTEREST OF WARBURG IN THE REORGANIZATIONS.................................................................    16
 
INFORMATION ON SHAREHOLDERS' RIGHTS........................................................................    16
 
ADDITIONAL INFORMATION.....................................................................................    18
 
VOTING INFORMATION.........................................................................................    18
 
OTHER BUSINESS.............................................................................................    20
 
FINANCIAL STATEMENTS AND EXPERTS...........................................................................    20
 
LEGAL MATTERS..............................................................................................    20
 
EXHIBIT A: FORM OF AGREEMENT AND PLAN OF REORGANIZATION....................................................   A-1
</TABLE>
 
                                       3
 


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                              ADDITIONAL MATERIALS
 
     The  following  additional  materials,  which  have  been  incorporated  by
reference into  the Statement  of  Additional Information  dated March  7,  1996
relating  to this  Combined Prospectus/Proxy Statement  and the Reorganizations,
will be  sent  to  all  shareholders  of  the  relevant  Existing  Warburg  Fund
requesting a copy of such Statement of Additional Information.
 
     1.  The Statement  of Additional  Information of  the relevant  New Warburg
Fund, dated March 4, 1996.
 
     2. The Statements of Additional Information for each class of Shares of the
relevant Existing Warburg Fund, dated December 29, 1995.
 
                                       4


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                                    SUMMARY
 
     This  summary is qualified  in its entirety by  reference to the additional
information contained elsewhere in this combined Prospectus/Proxy Statement, the
Plan, a copy of the form of which is attached to this combined  Prospectus/Proxy
Statement  as Exhibit  A, the Prospectuses  of the Existing  Warburg Funds dated
December 29,  1995, the  Statements of  Additional Information  of the  Existing
Warburg Funds dated December 29, 1995, the Prospectuses of the New Warburg Funds
dated  March 4,  1996 and  the Statements of  Additional Information  of the New
Warburg Funds dated March 4, 1996.
 
     Proposed Reorganization.  The Plan  provides  for the  transfer of  all  or
substantially all of the assets and liabilities of each Existing Warburg Fund to
the  corresponding New Warburg  Fund in exchange  for shares of  the New Warburg
Fund. The Plan also calls for the  distribution of shares of a New Warburg  Fund
to  the corresponding Existing Warburg Fund's shareholders in liquidation of the
Existing Warburg  Fund. (The  foregoing proposed  transactions as  regards  each
Existing  Warburg  Fund  are  referred  to  in  this  Combined  Prospectus/Proxy
Statement as  the 'Reorganization').  As a  result of  the Reorganization,  each
shareholder  of an Existing Warburg Fund will become the owner of that number of
full and fractional shares  of the same class  of the corresponding New  Warburg
Fund  having an aggregate  net asset value  equal to the  aggregate value of the
shareholder's shares of the Existing Warburg Fund as of the close of business on
the date that each  Existing Warburg Fund's assets  are exchanged for shares  of
the  corresponding New  Warburg Fund. Holders  of Common Shares  of the Existing
Warburg Fund  will become  holders of  Common Shares  of the  corresponding  New
Warburg  Fund and holders  of Advisor Shares  of the Existing  Warburg Fund will
become holders of  Advisor Shares  of the  corresponding New  Warburg Fund.  See
'Information About the Reorganization -- Plan of Reorganization.'
 
     For the reasons set forth below under 'Reasons for the Reorganization,' the
Board  of Directors of the RBB Fund, including the Directors of the RBB Fund who
are not  'interested persons'  (the 'Independent  Directors'), as  that term  is
defined  in the Investment Company Act of 1940, as amended (the '1940 Act'), has
unanimously concluded that the Reorganization would be in the best interests  of
the  shareholders of each Existing  Warburg Fund and that  the interests of each
Existing Warburg Fund's existing shareholders will not be diluted as a result of
the transaction  contemplated by  the Reorganization.  The Board  therefore  has
submitted  the Plan for  approval by each  Existing Warburg Fund's shareholders.
The Board of Directors of each New Warburg Fund has reached similar  conclusions
with  respect to the New  Warburg Fund and has  also approved the Reorganization
with respect to the New Warburg Fund.
 
     Approval of the Reorganization of an Existing Warburg Fund will require the
affirmative vote of the  holders of a majority  of that Existing Warburg  Fund's
outstanding  shares. See 'Voting Information.' No Reorganization of any Existing
Warburg Fund is contingent on the approval and/or closing of the  Reorganization
of  any other Existing Warburg Fund. In the  event that the Plan is not approved
by shareholders of one or more  Existing Warburg Funds, the Board will  consider
what other course of action, if any, should be taken.
 
     Tax  Consequences. Prior to completion of the Reorganization, each Existing
Warburg Fund  and its  corresponding  New Warburg  Fund  will have  received  an
opinion of counsel that, upon the closing of the Reorganization and the transfer
of  the assets of such Existing Warburg Fund, no gain or loss will be recognized
by the  Existing  Warburg  Fund  or its  shareholders  for  federal  income  tax
purposes.  The holding period  and aggregate tax basis  of the corresponding New
Warburg Fund's shares received by an  Existing Warburg Fund shareholder will  be
the  same as  the holding period  and aggregate tax  basis of the  shares of the
Existing Warburg  Fund previously  held by  such shareholder.  In addition,  the
holding  period and tax basis of the assets of each Existing Warburg Fund in the
hands of the corresponding  New Warburg Fund as  a result of the  Reorganization
will  be the same as in the hands of the Existing Warburg Fund immediately prior
to the Reorganization.
 
     Investment Objectives and Policies. Each New Warburg Fund was organized for
the purpose of acquiring the assets  of the corresponding Existing Warburg  Fund
and  each New Warburg Fund will have  the same investment objective, and, except
as noted below under 'Comparison of Investment
 
                                       5
 


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Objectives and Policies,' the  same investment policies  and limitations as  the
corresponding Existing Warburg Fund.
 
     Purchase  and Redemption Procedures. The purchase and redemption procedures
available to shareholders of  each New Warburg Fund  are virtually identical  to
those  available  to shareholders  of the  corresponding Existing  Warburg Fund.
Purchases of shares  of each  New Warburg  Fund and  the corresponding  Existing
Warburg  Fund may be made by mail, or with advance arrangements, by wire through
the Funds' distributor, Counsellors Securities Inc. ('CSI'). Shares of the Funds
are sold at net asset value per share and without a sales charge. Common  Shares
of  the New and Existing Balanced and Tax  Free Funds are subject to a 12b-1 fee
of .25% per annum. Advisor  Shares of the New and  Existing Growth & Income  and
Balanced Funds are subject to a 12b-1 fee of up to .75% per annum.
 
     Exchange  Privileges. The exchange privileges  available to shareholders of
each New Warburg Fund  are identical to those  available to shareholders of  the
corresponding  Existing Warburg Fund. Shareholders of each Existing Warburg Fund
and the corresponding New Warburg Funds may exchange at net asset value all or a
portion of their shares  for shares of  the same class  of certain other  mutual
funds  advised  by  Warburg  at  their  respective  net  asset  values. However,
shareholders may not effect exchanges between Common Shares and Advisor  Shares.
Exchanges  may be effected by  mail or by telephone.  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,  each Fund
reserves 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,  Common
Share  exchanges may be made among the Funds with Common Shares of the following
other Warburg Pincus 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   Intermediate  Municipal   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 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 Small  Company Value Fund  -- an  equity fund seeking
           long-term capital  appreciation  by  investing  primarily  in  equity
           securities of small companies;
 
           Warburg Pincus Emerging Growth Fund -- an equity fund seeking maximum
           capital appreciation by investing in emerging growth companies;
 
           Warburg  Pincus Post-Venture Capital  Fund -- an  equity fund seeking
           long-term growth  of  capital  by  investing  principally  in  equity
           securities   of  issuers  in  their  post-venture  capital  stage  of
           development;
 
                                       6
 


<PAGE>
<PAGE>

           Warburg Pincus International Equity  Fund -- an international  equity
           fund seeking long-term capital appreciation;
 
           Warburg Pincus Emerging Markets Fund -- an equity fund seeking growth
           of  capital by investing primarily in securities of non-United States
           issuers consisting of companies in emerging securities markets;
 
           Warburg Pincus Japan Growth Fund -- an equity fund seeking  long-term
           growth  of  capital by  investing primarily  in equity  securities of
           Japanese issuers; and
 
           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.
 
     An   institutional  shareholder  of  record  and  certain  other  financial
intermediaries may exchange Advisor Shares of a Fund for Advisor Shares of other
Warburg Pincus Funds.
 
     The exchange privilege is available  to shareholders residing in any  state
in  which the Fund's 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. No initial sales charge is imposed on  the
shares being acquired in an exchange. See 'How to Redeem and Exchange Shares' in
the accompanying Prospectuses of the New Warburg Funds.
 
     Dividends.  Each  New  Warburg Fund  and  each Existing  Warburg  Fund will
distribute substantially  all of  the  net investment  income and  net  realized
capital gains, if any, of the Fund to the Fund's shareholders. All distributions
are  reinvested in the  form of additional  full and fractional  shares unless a
shareholder elects otherwise. The Existing and New Growth & Income and  Balanced
Funds  declare and pay dividends, if  any, from net investment income quarterly.
The Existing and New Tax Free Funds declare dividends from net investment income
daily and pay such dividends monthly. Net realized capital gains (including  net
short-term  capital gains), if any, of each New Warburg Fund, like each Existing
Warburg  Fund,  will   be  distributed  at   least  annually.  See   'Dividends,
Distributions  and Taxes'  in the accompanying  Prospectuses of  the New Warburg
Funds.
 
     Shareholder Voting Rights. The  New Warburg Funds  are registered with  the
Securities  and Exchange Commission as open-end management investment companies.
The Existing Warburg Funds are each a  separate series of the RBB Fund which  is
also  registered as an open-end management  investment company. The RBB Fund and
the New  Warburg  Funds  are  Maryland corporations,  each  having  a  Board  of
Directors.  Shareholders of both the New  Warburg Funds and the Existing Warburg
Funds have similar voting rights. Neither the New Warburg Fund nor the RBB  Fund
on  behalf  of  the  Existing  Warburg Funds  holds  a  meeting  of shareholders
annually, except as required by the 1940  Act or other applicable law. Each  New
Warburg  Fund's By-Laws provides that  shareholders collectively owning at least
ten percent of the outstanding shares of  all classes of stock of the Fund  have
the  right to call for a meeting of  shareholders to consider the removal of one
or more directors. To  the extent required  by law, the  New Warburg Funds  will
assist in shareholder communication in such matters.
 
     In  addition, under the laws of the  State of Maryland, shareholders of the
New Warburg Funds and the Existing Warburg Funds do not have appraisal rights in
connection with  a combination  or acquisition  of  the assets  of the  Fund  by
another  entity. Shareholders of  an Existing Warburg  Fund may, however, redeem
their shares at net  asset value prior  to the date  of the Reorganization.  See
'Information on Shareholders' Rights -- Voting Rights.'
 
                                       7


<PAGE>
<PAGE>

                                  RISK FACTORS
 
     Due  to the fact  that the investment  objectives and policies  of each New
Warburg Fund  are virtually  identical to  those of  the corresponding  Existing
Warburg   Fund,  the  investment  risks   are  substantially  similar.  See  the
accompanying Prospectuses  of the  applicable New  Warburg Fund  for a  complete
discussion of the risks of investing in that Fund.
 
                        REASONS FOR THE REORGANIZATIONS
 
     The  Board of Directors  of the RBB Fund  has determined that  it is in the
best interest of  each Existing Warburg  Fund to effect  the Reorganization.  In
reaching  this conclusion, the  Board considered a  number of factors, including
the following:
 
          1. the terms and conditions of the Reorganizations;
 
          2. the  identical investment  objectives and  substantially  identical
     policies  and restrictions of each New Warburg Fund in relation to those of
     the corresponding Existing Warburg Fund;
 
          3. that the investment advisor, co-administrators, custodian, transfer
     agent and accountant for each New Warburg Fund are the same as those of the
     corresponding Existing Warburg Fund;
 
          4. the federal tax consequences of the Reorganizations to the Existing
     Warburg Funds, the New Warburg Funds and the shareholders of each, and that
     a legal opinion  will be rendered  that no recognition  of income, gain  or
     loss  for  federal  income tax  purposes  will  occur as  a  result  of the
     Reorganizations to any of them;
 
          5. that the interests  of shareholders of  the Existing Warburg  Funds
     will not be diluted as a result of the Reorganizations;
 
          6.  that CSI and PFPC Inc.,  the Fund's co-administrator ('PFPC'), (or
     their affiliates) have agreed to waive fees and reimburse expenses for  the
     one-year  period following the closing of the Reorganizations to the extent
     necessary for the  net expense  ratio of  each New  Warburg Fund  to be  no
     higher  than the average of that of the corresponding Existing Warburg Fund
     for the thirty days ending  on May 3, 1996, or  such date as may be  agreed
     upon by the parties to the Reorganizations (the 'Closing Date');
 
          7. that the expenses of the Reorganizations will be borne by Warburg;
 
          8.  that  no  sales charge  will  be  imposed in  connection  with the
     Reorganizations;
 
          9. that the Reorganizations would integrate the Existing Warburg Funds
     fully into the Warburg  Pincus Funds family,  thereby, among other  things,
     reducing  confusion  in the  marketplace  and reducing  the  possibility of
     inconsistencies in operations;
 
          10. that the Reorganizations may increase economic efficiencies of the
     Existing Warburg Funds; and
 
          11.  that  the   Reorganizations  would   remove  certain   regulatory
     limitations  on the ability of the Existing Warburg Funds to effect certain
     transactions with parties that are affiliated persons of the RBB Fund.
 
     In light  of  the  foregoing, the  Board  of  Directors of  the  RBB  Fund,
including  the  Independent Directors,  has determined  that it  is in  the best
interest of  each Existing  Warburg  Fund and  its  shareholders to  effect  the
Reorganization.   The  Board   of  Directors   has  also   determined  that  the
Reorganization of an  Existing Warburg  Fund and the  corresponding New  Warburg
Fund  would not result  in a dilution  of the interests  of the Existing Warburg
Fund's shareholders.
 
     The Board of Directors of each New Warburg Fund has also determined that it
is advantageous to the New Warburg Fund to effect the Reorganization. The  Board
of  Directors also considered the terms and conditions of the Reorganization and
representations  that  the  Reorganization  would  be  effected  as  a  tax-free
reorganization.  Accordingly, the Board  of Directors of  each New Warburg Fund,
including a  majority of  the  Independent Directors,  has determined  that  the
Reorganization  is in the best interests  of the New Warburg Fund's shareholders
and that  the interests  of the  New Warburg  Fund's shareholders  would not  be
diluted as a result of the Reorganization.
 
                                       8
 


<PAGE>
<PAGE>

                                   FEE TABLES
 
     Following  are tables  showing current costs  and expenses  of the Existing
Warburg Funds and  the costs and  expenses expected  to be incurred  by the  New
Warburg  Funds after  giving effect  to the  Reorganizations. The  tables do not
reflect charges that  institutions and  financial intermediaries  may impose  on
their customers.
 
GROWTH & INCOME FUND -- COMMON SHARES
 
<TABLE>
<CAPTION>
                                                                                      EXISTING       NEW WARBURG
                                                                                    WARBURG FUND        FUND*
                                                                                    ------------    -------------
 
<S>                                                                                 <C>             <C>
SHAREHOLDER TRANSACTION EXPENSES
     Maximum sales charge imposed on purchases (as a percentage of offering
       price)....................................................................       None             None
ANNUAL OPERATING EXPENSES (after fee waivers and expense reimbursements)
     Management fees.............................................................        .75%             .75%
     12b-1 fees**................................................................          0                0
     Other expenses..............................................................        .49              .49
                                                                                       -----            -----
TOTAL OPERATING EXPENSES (after waivers and expense reimbursements)..............       1.24%            1.24%
                                                                                       -----            -----
                                                                                       -----            -----
</TABLE>
 
GROWTH & INCOME FUND -- ADVISOR SHARES
 
<TABLE>
<CAPTION>
                                                                                      EXISTING       NEW WARBURG
                                                                                    WARBURG FUND        FUND*
                                                                                    ------------    -------------
 
<S>                                                                                 <C>             <C>
SHAREHOLDER TRANSACTION EXPENSES
     Maximum sales charge imposed on purchases (as a percentage of offering
       price)....................................................................       None             None
ANNUAL OPERATING EXPENSES (after fee waivers and expense reimbursements)
     Management fees.............................................................        .75%             .75%
     12b-1 fees**................................................................        .50              .50
     Other expenses..............................................................        .38              .38
                                                                                       -----            -----
TOTAL OPERATING EXPENSES (after waivers and expense reimbursements)..............       1.63%            1.63%
                                                                                       -----            -----
                                                                                       -----            -----
</TABLE>
 
BALANCED FUND -- COMMON SHARES
 
<TABLE>
<CAPTION>
                                                                                      EXISTING       NEW WARBURG
                                                                                    WARBURG FUND        FUND*
                                                                                    ------------    -------------
 
<S>                                                                                 <C>             <C>
SHAREHOLDER TRANSACTION EXPENSES
     Maximum sales charge imposed on purchases (as a percentage of offering
       price)....................................................................       None            None*
ANNUAL OPERATING EXPENSES (after fee waivers and expense reimbursements)
     Management fees.............................................................          0                0
     12b-1 fees**................................................................        .25%             .25%
     Other expenses..............................................................       1.35             1.35
                                                                                       -----            -----
TOTAL OPERATING EXPENSES (after waivers and expense reimbursements)..............       1.60%            1.60%
                                                                                       -----            -----
                                                                                       -----            -----
</TABLE>
 
                                       9
 


<PAGE>
<PAGE>

BALANCED FUND -- ADVISOR SHARES
 
<TABLE>
<CAPTION>
                                                                                      EXISTING       NEW WARBURG
                                                                                    WARBURG FUND        FUND*
                                                                                    ------------    -------------
 
<S>                                                                                 <C>             <C>
SHAREHOLDER TRANSACTION EXPENSES
     Maximum sales charge imposed on purchases (as a percentage of offering
       price)....................................................................       None             None
ANNUAL OPERATING EXPENSES (after fee waivers and expense reimbursements)
     Management fees.............................................................          0                0
     12b-1 fees**................................................................        .50%             .50%
     Other expenses..............................................................       1.35             1.35
                                                                                       -----            -----
TOTAL OPERATING EXPENSES (after waivers and expense reimbursements)..............       1.85%            1.85%
                                                                                       -----            -----
                                                                                       -----            -----
</TABLE>
 
TAX FREE FUND -- COMMON SHARES
 
<TABLE>
<CAPTION>
                                                                                      EXISTING       NEW WARBURG
                                                                                    WARBURG FUND        FUND*
                                                                                    ------------    -------------
 
<S>                                                                                 <C>             <C>
SHAREHOLDER TRANSACTION EXPENSES
     Maximum sales charge imposed on purchases (as a percentage of offering
       price)....................................................................       None             None
ANNUAL OPERATING EXPENSES (after fee waivers and expense reimbursements)
     Management fees.............................................................          0                0
     12b-1 fees**................................................................        .25%             .25%
     Other expenses..............................................................        .25              .25
                                                                                       -----            -----
TOTAL OPERATING EXPENSES (after waivers and expense reimbursements)..............        .50%             .50%
                                                                                       -----            -----
                                                                                       -----            -----
</TABLE>
 
- ------------
 
 * CSI  and  PFPC Inc.  (or  their affiliates)  have  agreed to  waive  fees and
   reimburse expenses of each New Warburg  Fund for a one-year period  following
   the closing of a Reorganization so that the expense ratio of each New Warburg
   Fund will be no higher than the average of that of the corresponding Existing
   Warburg  Fund  for  the  thirty  days  ending  on  the  Closing  Date  of the
   Reorganization.
 
** The Advisor Shares impose a 12b-1 fee of  up to .75% per annum, which is  the
   economic equivalent of a sales charge. Long-term shareholders of the Existing
   and  New Balanced Fund, the Existing and  New Tax-Free Fund or Advisor Shares
   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').
 
                            ------------------------
 
     Expenses for the Funds reflect current expense levels as of March 1,  1996.
In  addition, the Fee Tables  reflect a voluntary waiver  of Management Fees and
the reimbursement of a portion of the expenses of the Existing Balanced and  Tax
Free   Funds  by  Warburg.  Absent  such  waivers  and  expense  reimbursements,
Management Fees for the Existing Balanced Fund and Existing Tax Free Fund  would
have  equaled .90% and .50%, respectively;  Other Expenses for the Common Shares
for the Existing Balanced and Tax Free Funds would have equaled 1.71% and 2.86%,
respectively, and, with respect  to the Existing  Balanced Fund Advisor  Shares,
Other  Expenses would have equaled 1.71%;  and Total Fund Operating Expenses for
the Common  Shares for  the Existing  Balanced  and Tax  Free Funds  would  have
equaled  2.86% and  3.61%, respectively, and  with respect  to Existing Balanced
Fund Advisor Shares, would have equaled 3.11%.
 
                                       10
 


<PAGE>
<PAGE>

EXAMPLES
 
     The following examples are intended to assist an investor in  understanding
the  various costs that an investor in  the New Warburg Funds will bear directly
or indirectly. The examples assume payment  of operating expenses at the  levels
set forth in the tables above.
 
<TABLE>
<CAPTION>
                                                                                                   1 YEAR    3 YEARS
                                                                                                   ------    -------
 
<S>                                                                                                <C>       <C>
An investor would pay the following expenses on a $1,000 investment, assuming (1) 5.00% annual
  return and (2) redemption at the end of each time period:
 
     Growth & Income Fund -- Common Shares
          Existing Warburg Fund.................................................................    $ 13       $39
          New Warburg Fund......................................................................      13        39
 
     Growth & Income Fund -- Advisor Shares
          Existing Warburg Fund.................................................................      17        51
          New Warburg Fund......................................................................      17        51
 
     Balanced Fund -- Common Shares
          Existing Warburg Fund.................................................................      16        50
          New Warburg Fund......................................................................      16        50
 
     Balanced Fund -- Advisor Shares
          Existing Warburg Fund.................................................................      19        58
          New Warburg Fund......................................................................      19        58
 
     Tax Free Fund -- Common Stock
          Existing Warburg Fund.................................................................       5        16
          New Warburg Fund......................................................................       5        16
</TABLE>
 
     The  examples in the Fee Tables assume that all dividends and distributions
are reinvested.
 
     The examples provide a means for the investor to compare expense levels  of
funds  with  different  fee  structures  over  varying  investment  periods.  To
facilitate such comparison,  all funds are  required to utilize  a 5.00%  annual
return  assumption.  However, each  Fund's actual  return will  vary and  may be
greater  or  less  than   5.00%.  THESE  EXAMPLES   SHOULD  NOT  BE   CONSIDERED
REPRESENTATIONS OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY BE GREATER OR
LESSER THAN THOSE SHOWN.
 
                                       11


<PAGE>
<PAGE>

                     INFORMATION ABOUT THE REORGANIZATIONS
 
     Agreement and Plan of Reorganization. The following summary of each Plan is
qualified  in its entirety by reference to  the form of Plan (Exhibit A hereto).
Each Plan  provides that  the relevant  New  Warburg Fund  will acquire  all  or
substantially  all of the  assets of the corresponding  Existing Warburg Fund in
exchange for  shares of  the New  Warburg Fund  and the  assumption by  the  New
Warburg  Fund of  the liabilities  of the Existing  Warburg Fund  on the Closing
Date.
 
     Prior to the Closing Date, the RBB Fund on behalf of each Existing  Warburg
Fund  will endeavor to  discharge all of its  known liabilities and obligations.
The New Warburg Fund shall assume all liabilities, expenses, costs, charges  and
reserves  reflected on an  unaudited statement of assets  and liabilities of the
corresponding Existing Warburg Fund prepared by PFPC, as of the close of regular
trading on the New York Stock Exchange, Inc., currently 4:00 p.m. New York  City
time,  on the  Closing Date,  in accordance  with generally  accepted accounting
principles consistently applied from the  prior audited period. The New  Warburg
Fund  shall also  assume any liabilities  of the  corresponding Existing Warburg
Fund arising from  the operations  and/or transactions of  the Existing  Warburg
Fund  prior to and including the Closing Date.  The net asset value per share of
each class of each  Fund will be  determined by adding  the relevant class'  pro
rata  share  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 that class  of shares,  and dividing the
result by the  total number of  outstanding shares of  the relevant class.  Each
Existing  Warburg Fund and  the corresponding New Warburg  Fund will utilize the
procedures set forth in their  respective current Prospectuses or Statements  of
Additional  Information  to determine  the value  of their  respective portfolio
securities and to determine the aggregate value of each Fund's portfolio.
 
     As soon after the Closing  Date as conveniently practicable, each  Existing
Warburg Fund will liquidate and distribute pro rata to shareholders of record as
of the close of business on the Closing Date the shares of the same class of the
corresponding  New  Warburg Fund  received by  the  Existing Warburg  Fund. Such
liquidation and  distribution  will  be accomplished  by  the  establishment  of
accounts  in the names of the Existing  Warburg Fund's shareholders on the share
records of the  corresponding New  Warburg Fund's transfer  agent. Each  account
will  represent the respective pro rata number  of shares of the class of shares
of the corresponding New Warburg Fund due to each of the Existing Warburg Fund's
shareholders.
 
     The consummation of each  Reorganization is subject  to the conditions  set
forth  in the Plan. Notwithstanding approval  by the shareholders of an Existing
Warburg Fund, the Plan may be terminated with respect to a Reorganization at any
time at or prior to the Closing Date:  (i) by mutual agreement of The RBB  Fund,
on  behalf of an Existing Warburg Fund,  and the corresponding New Warburg Fund;
(ii) by The RBB Fund,  on behalf of an Existing  Warburg Fund, in the event  the
corresponding  New Warburg Fund shall,  or a New Warburg  Fund, in the event the
RBB Fund or the corresponding Existing Warburg Fund shall, materially breach any
representation, warranty or agreement contained in  the Plan to be performed  at
or  prior to the Closing Date; or (iii)  if a condition to the Plan expressed to
be precedent to the obligations of the terminating party has not been met and it
reasonably appears that it will not or cannot be met.
 
     Pursuant to the  Plan, each New  Warburg Fund has  agreed to indemnify  and
advance  expenses to  each director  or officer  of The  RBB Fund  against money
damages incurred  in connection  with any  claim arising  out of  such  person's
services  as a director or officer with respect to matters specifically relating
to the  corresponding Existing  Warburg  Fund. Each  Existing Warburg  Fund  has
obtained  a  rider  for  its current  directors  and  officers  liability policy
extending the  period for  making  claims under  the  policy until  three  years
following  the  Closing Date.  The premium  for the  three-year period  has been
prepaid by the Existing Warburg Fund.
 
     Warburg has agreed  to indemnify each  person who served  as a director  or
officer of The RBB Fund on the date of execution of the Plan against any and all
direct   and  indirect   liabilities,  losses,  claims,   damages  and  expenses
(including, without  limitation, reasonable  attorneys' fees)  (each, a  'Loss')
that arise from or relate to the operations commencing on the first business day
after  the Closing Date of the New Warburg  Funds, to the extent that a Loss has
not been recovered against the relevant New Warburg Fund.
 
                                       12
 


<PAGE>
<PAGE>

     Approval of  the Plan  with  respect to  each  Existing Warburg  Fund  will
require  the  affirmative vote  of a  majority of  each Existing  Warburg Fund's
outstanding shares in  the aggregate without  regard to class,  in person or  by
proxy,  if a quorum  is present. The  approval of shareholders  of any other RBB
Fund or of shareholders of the  New Warburg Funds is not required.  Implementing
the  Reorganization by any one Existing Warburg Fund would not be conditioned on
receipt of shareholder approval by any other Existing Warburg Fund. Shareholders
of the Existing Warburg Funds  are entitled to one vote  for each share. If  the
Reorganization  is not approved by shareholders of an Existing Warburg Fund, the
Board of Directors of the RBB Fund on behalf of the applicable Existing  Warburg
Fund  will consider other possible courses  of action available to it, including
resubmitting the Reorganization proposal to shareholders.
 
     Description of the New  Warburg Funds' Shares. Shares  of each New  Warburg
Fund  will be  issued to the  corresponding Existing Warburg  Fund in accordance
with the procedures detailed  in the Plan  and as described  in the New  Warburg
Funds'  Prospectuses. The New  Warburg Funds do not  issue share certificates to
shareholders. See 'Information on Shareholders' Rights' and the Prospectuses  of
the  New Warburg Funds for additional information  with respect to the shares of
the New Warburg Funds.
 
     Federal Income Tax Consequences.  The exchange of  assets of each  Existing
Warburg  Fund for shares  of the corresponding  New Warburg Fund  is intended to
qualify for  federal income  tax  purposes as  a tax-free  reorganization  under
Section 368(a) of the Internal Revenue Code of 1986, as amended (the 'Code'). As
a  condition to the closing of the Reorganization, each New Warburg Fund and The
RBB Fund on behalf  of the corresponding Existing  Warburg Fund will receive  an
opinion  from Willkie Farr & Gallagher, counsel to the New Warburg Funds, to the
effect that, on the basis of the existing provisions of the Code, U.S.  Treasury
regulations  issued thereunder, current administrative rules, pronouncements and
court decisions,  for federal  income  tax purposes,  upon consummation  of  the
Reorganization:
 
          (1)  the transfer of all or substantially all of each Existing Warburg
     Fund's assets in exchange for  the corresponding New Warburg Fund's  shares
     and  the assumption by the New Warburg  Fund of liabilities of the Existing
     Warburg Fund  will  constitute a  'reorganization'  within the  meaning  of
     Section  368(a) of the Code, and the New Warburg Fund and the corresponding
     Existing Warburg Fund  are each a  'party to a  reorganization' within  the
     meaning of Section 368(b) of the Code;
 
          (2)  no gain or loss will be  recognized by each New Warburg Fund upon
     the receipt of the assets of the corresponding Existing Warburg Fund solely
     in exchange for the New Warburg Fund's shares and the assumption by the New
     Warburg Fund of liabilities of the corresponding Existing Warburg Fund;
 
          (3) no gain or loss will  be recognized by each Existing Warburg  Fund
     upon   the  transfer  of   the  Existing  Warburg   Fund's  assets  to  the
     corresponding New  Warburg Fund  in  exchange for  the New  Warburg  Fund's
     shares  and the assumption  by the New  Warburg Fund of  liabilities of the
     Existing  Warburg  Fund  or  upon  the  distribution  (whether  actual   or
     constructive)  of the  New Warburg  Fund's shares  to the  Existing Warburg
     Fund's shareholders;
 
          (4) no  gain  or loss  will  be  recognized by  shareholders  of  each
     Existing  Warburg Fund upon the exchange of  their shares for shares of the
     corresponding New Warburg Fund and the  assumption by the New Warburg  Fund
     of liabilities of the Existing Warburg Fund;
 
          (5)  the aggregate tax  basis of the  shares of each  New Warburg Fund
     received by each  shareholder of  the corresponding  Existing Warburg  Fund
     pursuant  to the Reorganization will be the same as the aggregate tax basis
     of shares of the Existing Warburg Fund held by such shareholder immediately
     prior to the Reorganization,  and the holding period  of shares of the  New
     Warburg  Fund to  be received by  each shareholder of  the Existing Warburg
     Fund will include the  period during which shares  of the Existing  Warburg
     Fund  exchanged therefor were held by  such shareholder (provided shares of
     the Existing Warburg Fund were  held as capital assets  on the date of  the
     Reorganization); and
 
          (6)  the tax basis of each  Existing Warburg Fund's assets acquired by
     the corresponding New Warburg  Fund will be  the same as  the tax basis  of
     such  assets  to  the  Existing  Warburg  Fund  immediately  prior  to  the
     Reorganization, and  the  holding period  of  the assets  of  the  Existing
 
                                       13
 


<PAGE>
<PAGE>

     Warburg  Fund in the hands of the  New Warburg Fund will include the period
     during which those assets were held by the Existing Warburg Fund.
 
     Shareholders of  each  Existing  Warburg  Fund  should  consult  their  tax
advisors  regarding the effect, if any,  of the proposed Reorganization in light
of their individual circumstances. Since  the foregoing discussion only  relates
to  the federal income  tax consequences of  the Reorganization, shareholders of
each Existing Warburg Fund  should also consult their  tax advisors as to  state
and local tax consequences, if any, of the Reorganization.
 
     Capitalization.  The following table shows  the capitalization of each Fund
as of the  close of business  on February 29,  1996 and the  combined pro  forma
capitalization  as  if  each Reorganization  had  occurred  as of  the  close of
business on that date.
 
<TABLE>
<CAPTION>
                                                   EXISTING WARBURG FUND    NEW WARBURG FUND        PRO FORMA
                                                        (UNAUDITED)           (UNAUDITED)           COMBINED
                                                   ---------------------    ----------------    -----------------
<S>                                                <C>                      <C>                 <C>
GROWTH & INCOME FUND -- Common Shares
     Net assets.................................     $1,050,086,210.11                 0        $1,050,086,210.11
     Net asset value per share..................     $           16.24                 0        $           16.24
     Shares outstanding.........................       64,647,776.8490                            64,647,776.8490
GROWTH & INCOME FUND -- Advisor Shares
     Net assets.................................     $   80,037,316.87                 0        $   80,037,316.87
     Net asset value per share..................     $           16.23                 0        $           16.23
     Shares outstanding.........................        4,932,004.8370                             4,932,004.8370
BALANCED FUND -- Common Shares
     Net assets.................................     $   19,578,313.86                 0        $   19,578,313.86
     Net asset value per share..................     $           11.85                 0        $           11.85
     Shares outstanding.........................        1,652,037.6760                             1,652,037.6760
BALANCED FUND -- Advisor Shares
     Net assets.................................     $        1,316.65                 0        $        1,316.65
     Net asset value per share..................     $           11.85                 0        $           11.85
     Shares outstanding.........................              111.0930                                   111.0930
TAX FREE FUND -- Common Shares
     Net assets.................................     $    4,416,268.07                 0        $    4,416,268.07
     Net asset value per share..................     $           10.62                 0        $           10.62
     Shares outstanding.........................          415,857.4290                               415,857.4290
</TABLE>
 
     The New Warburg Funds  will not commence  operations until consummation  of
the  Reorganizations  and,  accordingly,  as  of March  1,  1996  there  were no
outstanding shares of the New Warburg Funds.
 
     As of  the  Record  Date,  the  officers and  directors  of  the  RBB  Fund
beneficially  owned as a  group less than  1% of the  outstanding shares of each
Existing Warburg Fund. To the best knowledge  of the RBB Fund, as of the  Record
Date,  no shareholder or 'group'  (as that term is used  in Section 13(d) of the
Securities Exchange Act of  1934 (the 'Exchange Act')),  except as set forth  in
the following table,
 
                                       14
 


<PAGE>
<PAGE>

owned  beneficially or  of record more  than 5%  of the outstanding  shares of a
class of an Existing Warburg Fund.
 
<TABLE>
<CAPTION>
                                                                                                    PERCENT OWNED
                 EXISTING                                                                           AS OF RECORD
               WARBURG FUND                                   NAME AND ADDRESS                          DATE
- ------------------------------------------  -----------------------------------------------------   -------------
<S>                                         <C>                                                     <C>
Warburg Pincus Growth & Income              Charles Schwab & Co., Inc.                                   34.37%
  Fund -- Common Shares                     Reinvest Account
                                            Attn: Mutual Funds Dept.
                                            101 Montgomery Street
                                            San Francisco, CA 94104-4122
 
                                            Nat'l Financial Svs. Corp.                                   11.41%
                                            P.O. Box 3908
                                            Church Street Station
                                            New York, NY 10008
 
Warburg Pincus Growth & Income              Connecticut General Life Ins. Co.                            98.68%
  Fund -- Advisor Shares                    CIGNA Corp.
                                            P.O. Box 2975
                                            Hartford, CT 06104
 
Warburg Pincus Balanced Fund -- Common      Charles Schwab & Co., Inc.                                   41.81%
  Shares                                    Reinvest Account
                                            Attn: Mutual Funds Dept.
                                            101 Montgomery Street
                                            San Francisco, CA 94104-4122
 
                                            Nat'l Financial Svs. Corp.                                   24.58%
                                            P.O. Box 3908
                                            Church Street Station
                                            New York, NY 10008
 
Warburg Pincus Balanced Fund -- Advisor     Warburg, Pincus Counsellors, Inc.                            85.34%
  Shares                                    Attn: Stephen Distler
                                            466 Lexington Avenue
                                            New York, NY 10017
 
Warburg Pincus Tax Free Fund -- Common      Gruntal & Co.                                                10.93%
  Shares                                    14 Wall Street
                                            New York, NY 10005
 
                                            Gruntal & Co.                                                 9.71%
                                            14 Wall Street
                                            New York, NY 10005
</TABLE>
 
                COMPARISON OF INVESTMENT OBJECTIVES AND POLICIES
 
     The following discussion is based upon and qualified in its entirety by the
disclosures in the Prospectuses and Statements of Additional Information of  the
New Warburg Funds and the Existing Warburg Funds.
 
     Investment  Objectives. As stated above each  Existing Warburg Fund and its
corresponding New Warburg Fund have the same investment objective. There can  be
no assurance that any Fund will achieve its investment objective. The investment
objectives  of the New Warburg Funds, like  those of the Existing Warburg Funds,
may be changed by  the Board of  Directors without the  affirmative vote of  the
holders of a majority of the outstanding shares of the relevant Fund (as defined
in the 1940 Act).
 
     Primary  Investments. The New Warburg Funds  were organized for the purpose
of acquiring the assets of the corresponding Existing Warburg Funds and have the
same portfolio managers.  In addition,  the investment  policies and  investment
restrictions  of the  New Warburg  Funds were  developed so  that they  would be
identical to  those  of the  corresponding  Existing Warburg  Funds,  except  as
follows:
 
          (1)  the borrowing  limit of the  New Growth  & Income Fund  is 30% of
     total assets, while that of the Existing Growth & Income Fund is 10%; and
 
                                       15
 


<PAGE>
<PAGE>

          (2) the New Growth & Income Fund  may pledge up to 125% of any  amount
     it  borrows while the  Existing Growth &  Income Fund may  pledge up to the
     lesser of  the  amount  borrowed or  10%  of  its assets  at  the  time  of
     borrowing.
 
     All  of  the  investment restrictions  of  the Existing  Warburg  Funds are
fundamental and  cannot be  changed without  the approval  of the  holders of  a
majority  of a Fund's outstanding  shares. While the New  Warburg Funds have the
same investment  restrictions  (except  as  previously  stated),  the  following
restrictions  have been reclassified  as nonfundamental and can  be changed by a
New Warburg  Fund's Board  of Directors  without shareholder  approval: (i)  the
prohibition  of  a Fund  investing in  oil, gas  or mineral-related  programs or
leases; (ii) the  prohibition of a  Fund investing in  securities issued by  any
other investment company; and (iii) the prohibition of a Fund making investments
for  purposes  of  exercising  control or  management.  Warburg  has  no current
intention of recommending any change to any nonfundamental investment policy  of
the New Warburg Funds for the first year of their operations.
 
                             MANAGEMENT OF THE FUND
 
     Warburg  will provide investment advisory services to each New Warburg Fund
under an advisory  agreement substantially identical  to the advisory  agreement
currently  in effect between Warburg and the  RBB Fund relating to each Existing
Warburg Fund. The  same persons  who today  are responsible  for the  day-to-day
management  of each Existing Warburg  Fund will continue in  that role after the
Reorganizations. In addition,  PFPC and  Counsellors Funds  Services Inc.  would
continue  to provide  accounting and co-administrative  services, as applicable,
and CSI  would  continue  to  provide  distribution  services,  each  under  new
agreements  substantially identical  to those  now in  effect for  each Existing
Warburg Fund.  In  particular, the  advisory  fees, co-administration  fees  and
distribution fees payable under the related agreements would not be changed as a
result of the Reorganizations.
 
     State  Street Bank and Trust Company  will continue its role as shareholder
servicing  agent,  transfer  agent  and  dividend  disbursing  agent  after  the
Reorganizations.  PNC Bank will continue to  serve as custodian and State Street
Bank as  co-custodian for  foreign  securities. The  fees payable  for  transfer
agency  and custodial services will be  no higher after the Reorganizations than
before. Coopers & Lybrand L.L.P., the  auditors for the Existing Warburg  Funds,
will also serve in that capacity for the New Warburg Funds.
 
                   INTEREST OF WARBURG IN THE REORGANIZATIONS
 
     Warburg   may  be  deemed  to  have  an   interest  in  the  Plan  and  the
Reorganizations because it provides investment advisory services to the Existing
Warburg Funds. Warburg receives compensation from the Existing Warburg Funds for
services it provides pursuant to  advisory agreements. The terms and  provisions
of  these arrangements are described in  the New Warburg Fund Prospectuses under
'Management of the Fund -- Investment  Adviser.' Future growth of assets of  the
New  Warburg Funds, if any, can be expected to increase the total amount of fees
payable to Warburg  and its  affiliates and  to reduce  the amount  of fees  and
expenses  required to be waived  to maintain total fees  and expenses of the New
Warburg Funds at  agreed upon  levels. Warburg  may also  be deemed  to have  an
interest  in the Plan and the Reorganizations because, as of the Record Date, it
or one or more of its affiliates possessed or shared voting power or  investment
power  as a fiduciary on behalf of  its customers in the Existing Warburg Funds.
Warburg and  its affiliates  have advised  the Existing  Warburg Funds  that  it
intends  to vote the shares over which it has voting power at the Meeting in the
manner instructed by the customers for  which such shares are held. See  'Voting
Information.'
 
                      INFORMATION ON SHAREHOLDERS' RIGHTS
 
     General.  The RBB Fund  and the New Warburg  Funds are open-end diversified
management  investment   companies  registered   under  the   1940  Act,   which
continuously  offer  to sell  shares  at their  current  net asset  values. Each
Existing Warburg  Fund  is  a series  of  the  RBB Fund,  which  is  a  Maryland
corporation  that was incorporated on  February 29, 1988 and  is governed by its
Articles of Incorporation, By-Laws and Board of Directors. Each New Warburg Fund
is a Maryland corporation organized on January  24, 1996 and is governed by  its
Articles of Incorporation, By-Laws and Board of
 
                                       16
 


<PAGE>
<PAGE>

Directors.  Each Fund is also governed by  applicable state and federal law. The
RBB Fund has an authorized capital of thirty billion shares of common stock with
a par value of $.001 per share. Each New Warburg Fund has an authorized  capital
of three billion shares of common stock with a par value of $.001 per share. The
Board  of Directors  of the  RBB Fund has  authorized the  issuance of seventeen
series of  shares,  each  representing  shares  in  one  of  seventeen  separate
portfolios, and may authorize the issuance of additional series of shares in the
future. The assets of each portfolio are segregated and separately managed and a
shareholder's  interest is  in the assets  of the  portfolio in which  he or she
holds shares. In each  New Warburg Fund and  each Existing Warburg Fund,  shares
represent  interests  in the  assets  of the  relevant  Fund and  have identical
voting, dividend, liquidation and other rights on the same terms and  conditions
except  that expenses related to  the distribution of each  class of shares of a
Fund are borne  solely by  such class  and each  class of  shares has  exclusive
voting  rights with respect to provisions of such Fund's Rule 12b-1 distribution
plan pertaining to a particular class.
 
     Multi-Class Structure. The New and Existing Tax Free Funds have issued only
one class of shares. The New and Existing Growth & Income Funds and the Balanced
Funds each have issued two classes of shares: Common Shares and Advisor  Shares.
Individual  investors  may purchase  Advisor  Shares only  through institutional
shareholders  of  record,  broker-dealers,  financial  institutions,  depository
institutions and other financial intermediaries ('Institutions').
 
     The  New and Existing Growth & Income  and Balanced Funds are authorized to
offer Advisor Shares exclusively to Institutions whose clients or customers  (or
participants  in  the case  of  retirement plans)  ('Customers')  are beneficial
owners of  Advisor  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 Advisor Shares with
CSI pursuant to a Distribution Plan. Pursuant to the terms of an Agreement,  the
Service   Organization  agrees  to  perform  certain  distribution,  shareholder
servicing,  administrative  and/or  accounting   services  for  its   Customers.
Distribution  services would be  marketing or other  services in connection with
the promotion  and sale  of Advisor  Shares. Shareholder  services that  may  be
provided  include  responding to  Customer  inquiries, providing  information on
Customer investments  and  providing  other shareholder  liaison  services.  See
'Shareholder  Servicing' in the  Prospectuses of the  Existing New Warburg Funds
for Advisor Shares.
 
     Directors. The By-Laws of the RBB Fund and of each New Warburg Fund provide
that the term of office of  each Director shall be from  the time of his or  her
election  and qualification  until the next  annual meeting  of shareholders and
until his or her successor shall have been elected and shall have qualified. Any
Director of the RBB Fund or any New  Warburg Fund may be removed by the vote  of
at  least a majority of the shares of capital stock then entitled to be cast for
the election of Directors. Vacancies  on the Boards of the  RBB Fund or any  New
Warburg  Fund may be filled  by the Directors remaining  in office. A meeting of
shareholders will be required for  the purpose of electing additional  Directors
whenever  fewer than a majority of the  Directors then in office were elected by
shareholders.
 
     Voting Rights.  Neither the  RBB Fund  nor  any New  Warburg Fund  holds  a
meeting   of  shareholders  annually,  and  there  normally  is  no  meeting  of
shareholders for the purpose of electing Directors unless and until such time as
less than  a majority  of the  Directors  holding office  have been  elected  by
shareholders.
 
     Liquidation  or Termination. In the event of the liquidation or termination
of any of the investment funds of the  RBB Fund or of any New Warburg Fund,  the
shareholders  of the fund are  entitled to receive, when  and as declared by the
Directors, the excess of the assets over the liabilities belonging to the  fund.
In  either case, the  assets so distributed to  shareholders will be distributed
among the shareholders in proportion to the number of shares of each class  held
by them and recorded on the books of the fund.
 
     Liability  of Directors. The Articles of  Incorporation of the RBB Fund and
of each New Warburg Fund  provide that the Directors  and officers shall not  be
liable  for  monetary damages  for breach  of  fiduciary duty  as a  Director or
officer, except  to the  extent such  exemption  is not  permitted by  law.  The
Articles of Incorporation further provide that the RBB Fund and each New Warburg
Fund  shall indemnify  each Director  and officer  and provide  advances for the
payment of expenses relating to the matter for which indemnification is  sought,
each  to the  fullest extent permitted  by Maryland General  Corporation Law and
other applicable law. Pursuant to the  Plan, each New Warburg Fund extends  this
 
                                       17
 


<PAGE>
<PAGE>

same  protection to current Directors and officers of the RBB Fund for liability
relating to the corresponding Existing Warburg Fund.
 
     Rights of Inspection. Maryland law permits any shareholder of the RBB  Fund
and  of each New  Warburg Fund or any  agent of such  shareholder to inspect and
copy,  during  usual  business  hours,  the  By-Laws,  minutes  of   shareholder
proceedings, annual statements of the affairs and voting trust agreements of the
RBB Fund and the New Warburg Fund on file at its principal offices.
 
     Shareholder Liability. Under Maryland law, shareholders of the RBB Fund and
of  each New Warburg Fund do not  have personal liability for corporate acts and
obligations. Shares of  a New  Warburg Fund issued  to the  shareholders of  the
corresponding Existing Warburg Fund in the Reorganization will be fully paid and
nonassessable  when issued, transferable  without restrictions and  will have no
preemptive rights.
 
     The  foregoing  is  only  a  summary  of  certain  characteristics  of  the
operations  of the New Warburg Funds and the  RBB Fund on behalf of the Existing
Warburg Funds. The  foregoing is  not a  complete description  of the  documents
cited.  Shareholders should refer  to the provisions  of the corporate documents
and state laws governing each Fund for a more thorough description.
 
                             ADDITIONAL INFORMATION
 
     Both  the  RBB  Fund  and  the  New  Warburg  Funds  are  subject  to   the
informational  requirements  of  the  Exchange  Act  and  the  1940  Act  and in
accordance  therewith  file  reports  and  other  information  including   proxy
material,  reports and charter  documents, with the SEC.  These materials can be
inspected and copies obtained at  the Public Reference Facilities maintained  by
the  SEC at 450 Fifth  Street, N.W., Washington, D.C. 20549  and at the New York
Regional Office of the SEC  at 7 World Trade Center,  Suite 1300, New York,  New
York  10048.  Copies of  such  material can  also  be obtained  from  the Public
Reference Branch,  Office of  Consumer Affairs  and Information  Services,  SEC,
Washington, D.C. 20549 at prescribed rates.
 
                               VOTING INFORMATION
 
     This  Combined Prospectus/Proxy Statement is furnished in connection with a
solicitation of proxies by the Board of Directors of the RBB Fund to be used  at
the  Special Meeting of Shareholders of the Existing Warburg Funds to be held at
3:00 p.m. on May  1, 1996, at the  offices of The RBB  Fund, Inc., 400  Bellevue
Parkway,  Wilmington,  Delaware 19809  and  at any  adjournment  or adjournments
thereof. This Combined Prospectus/Proxy  Statement, along with  a Notice of  the
Meeting and proxy card(s), is first being mailed to shareholders of the Existing
Warburg  Funds on or about March 8, 1996.  Only shareholders of record as of the
close of business on the Record Date will be entitled to notice of, and to  vote
at,  the Meeting or any adjournment thereof. As of the Record Date, the Existing
Warburg Funds  had  the  following  shares outstanding  and  entitled  to  vote:
Existing  Growth &  Income Fund 63,992,111.6950  (Common Shares), 4,939,664.0300
(Advisor  Shares);  Existing  Balanced  Fund  1,665,020.2620  (Common   Shares),
111.0930  (Advisor  Shares); and  Existing  Tax Free  Fund  416,881.9450 (Common
Shares). The holders  of one-third  of the shares  of an  Existing Warburg  Fund
outstanding  at the close  of business on  the Record Date  present in person or
represented by proxy will constitute a quorum for the Meeting of that Fund.  For
purposes  of  determining  a quorum  for  transacting business  at  the Meeting,
abstentions and broker  'nonvotes' (that  is, proxies from  brokers or  nominees
indicating  that such persons have not received instructions from the beneficial
owner or  other persons  entitled to  vote shares  on a  particular matter  with
respect  to which the brokers or nominees  do not have discretionary power) will
be treated as shares that  are present but which have  not been voted. For  this
reason,  abstentions and broker nonvotes will have the effect of a 'no' vote for
purposes of obtaining the requisite approval of the Plan. If the enclosed  proxy
is  properly  executed and  returned in  time to  be voted  at the  Meeting, the
proxies named  therein  will  vote  the  shares  represented  by  the  proxy  in
accordance  with the instructions marked thereon. Unmarked proxies will be voted
FOR approval of the relevant Plan and  FOR approval of any other matters  deemed
appropriate.  A proxy  may be revoked  at any time  on or before  the Meeting by
written notice to the Secretary of  The RBB Fund, Inc., Bellevue Park  Corporate
Center, 400 Bellevue Parkway, Suite 100, Wilmington, Delaware 19809.
 
                                       18
 


<PAGE>
<PAGE>

     Approval  of  the Plan  with  respect to  each  Existing Warburg  Fund will
require the  affirmative vote  of a  majority of  each Existing  Warburg  Fund's
outstanding  shares, voting in the aggregate  without regard to class, in person
or by proxy, if a quorum is  present. The approval of shareholders of any  other
investment   series  of  the   RBB  Fund  is   not  required.  Implementing  the
Reorganization by any  one Existing  Warburg Fund  would not  be conditioned  on
receipt of shareholder approval by any other Existing Warburg Fund. Shareholders
of the Existing Warburg Funds are entitled to one vote for each share.
 
     Proxy solicitations will be made primarily by mail, but proxy solicitations
also  may be  made by telephone,  telegraph or personal  interviews conducted by
officers and employees of Warburg and/or by PFPC or their respective affiliates.
In addition, D.F. King &  Co. Inc. ('D.F. King'), or  an agent of D.F. King  may
call  shareholders to ask if they would be willing to authorize D.F. King or its
agent to execute a proxy on their behalf authorizing the voting of their  shares
in   accordance  with  the   instructions  given  over   the  telephone  by  the
shareholders.  The  latter  telephone  solicitation  procedure  is  designed  to
authenticate  the  shareholder's identity  by,  among other  things,  asking the
shareholder to provide  his or her  social security  number (in the  case of  an
individual)  or taxpayer identification  number (in the case  of an entity). The
shareholder's instructions will be implemented in a proxy executed by D.F.  King
or  its agent and a confirmation will be  sent to the shareholder to ensure that
the vote has been authorized in accordance with the shareholder's  instructions.
Although  a shareholder's vote  may be solicited  and cast in  this manner, each
shareholder will receive a copy of this Combined Prospectus/Proxy Statement  and
may  vote by mail or by fax using  the enclosed proxy card. The Existing Warburg
Funds believe that this  telephone voting system will  comply with Maryland  law
and  will obtain an opinion of counsel to that effect prior to implementing such
procedures. The  aggregate  cost of  solicitation  of the  shareholders  of  the
Existing  Warburg Funds is expected to  be approximately $54,000 to $78,000. All
expenses of the Reorganization,  including the costs  of the proxy  solicitation
and  the preparation of  enclosures to the  Combined Prospectus/Proxy Statement,
reimbursement of  expenses of  forwarding  solicitation material  to  beneficial
owners  of  shares  of  the  Existing Warburg  Funds  and  expenses  incurred in
connection with the preparation of this Combined Prospectus/Proxy Statement will
be borne  by Warburg  or its  affiliates (excluding  extraordinary expenses  not
normally  associated with transactions of this type) and not by the Funds. It is
anticipated that banks,  brokerage houses and  other institutions, nominees  and
fiduciaries  will be requested  to forward proxy  materials to beneficial owners
and to  obtain  authorization for  the  execution  of proxies.  Warburg  or  its
affiliates,  may,  upon request,  reimburse  banks, brokerage  houses  and other
institutions, nominees and  fiduciaries for their  expenses in forwarding  proxy
materials to beneficial owners.
 
     In  the event that  a quorum necessary  for a shareholders'  meeting is not
present or sufficient votes to approve the Reorganization of an Existing Warburg
Fund are not received by May 1,  1996, the persons named as proxies may  propose
one  or  more adjournments  of  the Meeting  to  permit further  solicitation of
proxies. In determining whether  to adjourn the  Meeting, the following  factors
may  be considered:  the percentage  of votes  actually cast,  the percentage of
negative votes actually  cast, the nature  of any further  solicitation and  the
information  to be provided to shareholders with  respect to the reasons for the
solicitation. Any  such adjournment  will  require an  affirmative vote  by  the
holders  of  a majority  of the  shares  of the  relevant Existing  Warburg Fund
present in person or by proxy and  entitled to vote at the Meeting. The  persons
named  as proxies will vote upon a  decision to adjourn the Meeting with respect
to an Existing  Warburg Fund after  consideration of the  best interests of  all
shareholders of that Fund.
 
     As  of the  Record Date,  Warburg (or  its affiliates)  possessed or shared
voting power or investment power as a fiduciary on behalf of its customers, with
respect to  the  following number  of  shares (constituting  the  percentage  of
outstanding  shares indicated in parentheses) of each of the respective Existing
Warburg Funds: Existing  Warburg Growth &  Income Fund, 6,519,945.608  (10.19%);
Existing  Warburg Balanced  Fund, 19,351.726  (1.17%); and  Existing Warburg Tax
Free Fund, 34,729.816 (8.33%).
 
                                       19
 


<PAGE>
<PAGE>

                                 OTHER BUSINESS
 
     The RBB Fund Board of  Directors knows of no  other business to be  brought
before  the  Meeting. However,  if any  other matters  come before  the Meeting,
proxies that do not contain specific restrictions to the contrary will be  voted
on  such matters  in accordance with  the judgment  of the persons  named in the
enclosed Proxy Card.
 
     The approval of shareholders  of the New Warburg  Funds is not required  in
order  to  affect  the  Reorganizations  and,  accordingly,  the  votes  of  the
shareholders of the New Warburg Funds  are not being solicited by this  Combined
Prospectus/Proxy Statement.
 
                        FINANCIAL STATEMENTS AND EXPERTS
 
     The  audited statement of  assets and liabilities  of each Existing Warburg
Fund, including the schedule  of portfolio investments, as  of August 31,  1995,
the  related statements of operations for the  year then ended, the statement of
changes in net assets for each of the two years in the period then ended and the
financial highlights for each of the  years in the five-year period then  ended,
have   been  incorporated  by  reference  into  this  Combined  Prospectus/Proxy
Statement in reliance upon the reports of Coopers & Lybrand L.L.P.,  independent
accountants,  given on the authority  of such firm as  experts in accounting and
auditing. There is no financial information  available at this time for the  New
Warburg Funds, which have not yet commenced operations.
 
                                 LEGAL MATTERS
 
     Certain  legal matters concerning the issuance of shares of the New Warburg
Funds will be passed upon by Willkie Farr & Gallagher, One Citicorp Center,  153
East 53rd Street, New York, New York 10022, counsel to the New Warburg Funds. In
rendering  such opinion,  Willkie Farr  & Gallagher  may rely  on an  opinion of
Venable, Baetjer and Howard, L.L.P. as to certain matters under Maryland law.
 
                                       20


<PAGE>
<PAGE>
                                                                       EXHIBIT A
 
                  FORM OF AGREEMENT AND PLAN OF REORGANIZATION
 
     THIS  AGREEMENT AND PLAN OF REORGANIZATION  (the 'Agreement') is made as of
this  6th   day   of   March,   1996,  between   and   among   Warburg,   Pincus
                    Fund, Inc., a Maryland corporation (the 'New Warburg Fund'),
and  The RBB Fund, Inc.,  a Maryland corporation (the  'RBB Fund'), on behalf of
the Warburg Pincus                     Fund, a series of shares of the RBB  Fund
(the 'Existing Warburg Fund').
 
     This Agreement is intended to be and is adopted as a plan of reorganization
and  liquidation  within the  meaning  of Section  368(a)  of the  United States
Internal Revenue Code of  1986, as amended (the  'Code'). The reorganization  of
the  Existing Warburg Fund (collectively,  the 'Reorganization') will consist of
the transfer of substantially all of the assets of the Existing Warburg Fund  in
exchange   solely  for   shares  of  the   applicable  class   of  common  stock
(collectively, the 'Shares'), of the New Warburg Fund corresponding thereto,  as
indicated in the table set forth in Schedule A hereto, and the assumption by the
New   Warburg  Fund  of  liabilities  of  the  Existing  Warburg  Fund  and  the
distribution, after the  Closing Date  hereinafter referred to,  of New  Warburg
Fund  Shares to the shareholders of the  Existing Warburg Fund in liquidation of
the Existing Warburg Fund as provided herein, all upon the terms and  conditions
hereinafter set forth in this Agreement.
 
     WHEREAS,  the Board of Directors of the  RBB Fund on behalf of the Existing
Warburg Fund has  determined that  the exchange  of all  of the  assets and  the
liabilities  of the Existing  Warburg Fund for  New Warburg Fund  Shares and the
assumption of such liabilities by the New Warburg Fund is in the best  interests
of  the RBB  Fund and the  Existing Warburg Fund  and that the  interests of the
existing shareholders of the RBB Fund and the Existing Warburg Fund would not be
diluted as a result of this transaction; and
 
     WHEREAS, the Board of Directors of the New Warburg Fund has determined that
the exchange of all of the assets  of the Existing Warburg Fund for New  Warburg
Fund  Shares is in the best interests of the New Warburg Fund's shareholders and
that the interests of  the existing shareholders of  the New Warburg Fund  would
not be diluted as a result of this transaction.
 
     NOW,  THEREFORE, in consideration of the  premises and of the covenants and
agreements hereinafter  set forth,  the  parties hereto  covenant and  agree  as
follows:
 
1.  TRANSFER OF ASSETS OF THE EXISTING WARBURG FUND IN EXCHANGE FOR NEW WARBURG
    FUND SHARES AND ASSUMPTION OF THE EXISTING WARBURG FUND'S LIABILITIES AND
    LIQUIDATION OF THE EXISTING WARBURG FUND
 
     1.1.  Subject to the terms and conditions herein set forth and on the basis
of the representations and warranties contained  herein, the RBB Fund agrees  to
transfer the Existing Warburg Fund's assets as set forth in paragraph 1.2 to the
New  Warburg Fund identified in  Schedule A, and the  New Warburg Fund agrees in
exchange therefor: (i) to deliver to the RBB Fund the number of New Warburg Fund
Shares, including fractional New Warburg Fund Shares, determined by dividing the
value of the Existing  Warburg Fund's net assets  attributable to each class  of
shares,  computed  in the  manner  and as  of  the time  and  date set  forth in
paragraph 2.1, by the net asset value of one New Warburg Fund Share of the  same
class, computed in the manner and as of the time and date set forth in paragraph
2.2;  and (ii) to  assume the liabilities  of the Existing  Warburg Fund, as set
forth in  paragraph 1.3.  Such  transactions shall  take  place at  the  closing
provided for in paragraph 3.1 (the 'Closing').
 
     1.2.  (a) The assets of the Existing Warburg Fund to be acquired by the New
Warburg Fund shall consist  of all property  including, without limitation,  all
cash,  securities and  dividend or interest  receivables which are  owned by the
Existing Warburg Fund and any deferred or prepaid expenses shown as an asset  on
the books of the Existing Warburg Fund on the closing date provided in paragraph
3.1 (the 'Closing Date').
 
     (b)  The RBB Fund, on behalf of the Existing Warburg Fund, has provided the
New Warburg Fund with a list of all of the Existing Warburg Fund's assets as  of
the date of execution of this Agreement.
 
                                      A-1
 


<PAGE>
<PAGE>

The RBB Fund, on behalf of the Existing Warburg Fund, reserves the right to sell
any  of these  securities but will  not, without  the prior approval  of the New
Warburg Fund, acquire  any additional  securities other than  securities of  the
type  in which  the New Warburg  Fund is permitted  to invest. The  RBB Fund, on
behalf of the Existing Warburg Fund, will, within a reasonable time prior to the
Closing Date, furnish the  New Warburg Fund  with a list  of the securities,  if
any,  on the Existing Warburg  Fund's list referred to  in the first sentence of
this paragraph  which  do not  conform  to  the New  Warburg  Fund's  investment
objectives,  policies and restrictions.  In the event  that the Existing Warburg
Fund holds any investments which the New Warburg Fund may not hold, the Existing
Warburg Fund  will dispose  of such  securities prior  to the  Closing Date.  In
addition,  if it is determined that the  portfolios of the Existing Warburg Fund
and the New Warburg Fund,  when aggregated, would contain investments  exceeding
certain percentage limitations imposed upon the New Warburg Fund with respect to
such  investments, the  Existing Warburg Fund,  if requested by  the New Warburg
Fund, will dispose of and/or reinvest a sufficient amount of such investments as
may be necessary to avoid violating such limitations as of the Closing Date.
 
     1.3. The RBB Fund, on behalf of the Existing Warburg Fund, will endeavor to
discharge all  the Existing  Warburg Funds'  known liabilities  and  obligations
prior  to the Closing  Date, other than those  liabilities and obligations which
would otherwise  be  discharged  at a  later  date  in the  ordinary  course  of
business.  The New Warburg  Fund shall assume  all liabilities, expenses, costs,
charges and  reserves, including  those liabilities  reflected on  an  unaudited
statement  of assets  and liabilities of  the Existing Warburg  Fund prepared by
PFPC Inc., as of the Valuation Date (as defined in paragraph 2.1), in accordance
with generally  accepted accounting  principles  consistently applied  from  the
prior  audited period. The  New Warburg Fund shall  also assume any liabilities,
expenses, costs or charges incurred by or on behalf of the Existing Warburg Fund
specifically arising from or relating  to the operations and/or transactions  of
the  Existing Warburg Fund prior to and including the Closing Date but which are
not reflected  on  the  above-mentioned statement  of  assets  and  liabilities,
including  any liabilities, expenses,  costs or charges  arising under paragraph
5.10 hereof.
 
     1.4. As provided in  paragraph 3.4, as  soon after the  Closing Date as  is
conveniently  practicable (the  'Liquidation Date'),  the Existing  Warburg Fund
will  liquidate  and  distribute  pro  rata  to  the  Existing  Warburg   Fund's
shareholders  of record determined  as of the  close of business  on the Closing
Date (the 'Existing Warburg Fund Shareholders')  the New Warburg Fund Shares  it
receives  pursuant to paragraph  1.1. Such liquidation  and distribution will be
accomplished by the transfer of the New Warburg Fund Shares then credited to the
account of the Existing  Warburg Fund on  the books of the  New Warburg Fund  to
open  accounts on the share records  of the New Warburg Fund  in the name of the
Existing Warburg Fund's shareholders representing the respective pro rata number
of the New Warburg  Fund Shares of the  particular class due such  shareholders.
All   issued  and  outstanding   shares  of  the   Existing  Warburg  Fund  will
simultaneously be  canceled  on  the  books of  the  RBB  Fund,  although  share
certificates  representing interests in the Existing Warburg Fund will represent
a number of  New Warburg Fund  Shares after  the Closing Date  as determined  in
accordance  with Section 2.3. The New  Warburg Fund shall not issue certificates
representing the New Warburg Fund Shares in connection with such exchange.
 
     1.5. Ownership of New Warburg Fund Shares will be shown on the books of the
New Warburg Fund's transfer agent. Shares of the New Warburg Fund will be issued
in the  manner  described in  the  New  Warburg Fund's  current  prospectus  and
statement of additional information.
 
     1.6.  Any  transfer taxes  payable upon  issuance of  the New  Warburg Fund
Shares in a name other than the  registered holder of the Existing Warburg  Fund
Shares  on the books  of the Existing Warburg  Fund as of that  time shall, as a
condition of such issuance and transfer, be paid by the person to whom such  New
Warburg Fund shares are to be issued and transferred.
 
     1.7. Any reporting responsibility of the Existing Warburg Fund is and shall
remain  the responsibility of  the RBB Fund  up to and  including the applicable
Closing Date  and  such  later dates  on  which  the Existing  Warburg  Fund  is
terminated.
 
                                      A-2
 


<PAGE>
<PAGE>

2.  VALUATION
 
     2.1.  The  value  of the  Existing  Warburg  Fund's assets  to  be acquired
hereunder shall be the value of such assets computed as of the close of  regular
trading  on the  New York  Stock Exchange, Inc.  (the 'NYSE')  on the applicable
Closing Date (such time and date being hereinafter called the 'Valuation Date'),
using the valuation  procedures set forth  in the Existing  Warburg Fund's  then
current prospectus or statement of additional information.
 
     2.2.  The net asset value  of each class of Shares  of the New Warburg Fund
shall be the net asset value per share computed as of the Valuation Date,  using
the  valuation  procedures set  forth  in the  New  Warburg Fund's  then current
prospectus or statement of additional information.
 
     2.3. The number  of Shares  of each  class of the  New Warburg  Fund to  be
issued  (including  fractional  shares, if  any)  in exchange  for  the Existing
Warburg Fund's net assets shall be determined  by dividing the value of the  net
assets  of the Existing  Warburg Fund attributable to  the respective classes of
Shares determined using the same  valuation procedures referred to in  paragraph
2.1  by the  net asset value  per Share  of such class  of the  New Warburg Fund
determined in accordance with paragraph 2.2.
 
     2.4. All computations  of value shall  be made by  PFPC Inc. in  accordance
with its regular practice as pricing agent for the Existing Warburg Fund and New
Warburg Fund, respectively.
 
3.  CLOSING AND CLOSING DATE
 
     3.1.  The Closing Date for the Reorganization shall be May 3, 1996, or such
other date as the parties  to such Reorganization may  agree to in writing.  All
acts taking place at the Closing shall be deemed to take place simultaneously as
of  the close  of business  on the Closing  Date unless  otherwise provided. The
Closing shall be held as of 4:00 p.m., at the offices of PFPC Inc., 400 Bellevue
Parkway, Wilmington, Delaware 19809, or at  such other time and/or place as  the
parties may agree.
 
     3.2.  The  custodian  for the  New  Warburg Fund  (the  'Custodian'), shall
deliver at the Closing a certificate of an authorized officer stating that:  (a)
the  Existing Warburg  Fund's portfolio  securities, cash  and any  other assets
shall have been delivered in proper form to the New Warburg Fund prior to or  on
the  Closing Date and (b) all  necessary taxes, including all applicable federal
and state stock transfer stamps, if any, shall have been paid, or provision  for
payment  shall have  been made,  in conjunction  with the  delivery of portfolio
securities.
 
     3.3. In  the event  that on  the Valuation  Date (a)  the NYSE  or  another
primary  trading market for portfolio securities of  the New Warburg Fund or the
Existing Warburg Fund  shall be closed  to trading or  trading thereon shall  be
restricted  or (b) trading or the reporting  of trading on the NYSE or elsewhere
shall be disrupted so that accurate appraisal of the value of the net assets  of
the  New  Warburg  Fund  or  the Existing  Warburg  Fund  is  impracticable, the
applicable Closing Date shall  be postponed until the  first business day  after
the day when trading shall have been fully resumed and reporting shall have been
restored.
 
     3.4. The RBB Fund, on behalf of the Existing Warburg Fund, shall deliver at
the  Closing a list  of the names  and addresses of  the Existing Warburg Fund's
shareholders and the number and class  of outstanding Shares owned by each  such
shareholder  immediately  prior to  the Closing  or  provide evidence  that such
information has been provided to the New Warburg Fund's transfer agent. The  New
Warburg  Fund shall issue and deliver  a confirmation evidencing the New Warburg
Fund Shares to be credited to the Existing Warburg Fund's account on the Closing
Date to the Secretary of  the RBB Fund or  provide evidence satisfactory to  the
RBB  Fund that such New  Warburg Fund Shares have  been credited to the Existing
Warburg Fund's account on  the books of  the New Warburg  Fund. At the  Closing,
each  party shall  deliver to  the relevant  other parties  such bills  of sale,
checks, assignments, share certificates, if any, receipts or other documents  as
such other party or its counsel may reasonably request.
 
4.  REPRESENTATIONS AND WARRANTIES
 
     4.1.  The RBB Fund, on behalf of  the Existing Warburg Fund, represents and
warrants to the New Warburg Fund as follows:
 
                                      A-3
 


<PAGE>
<PAGE>

          (a) The RBB  Fund is  a Maryland corporation  duly organized,  validly
     existing  and in good standing under the  laws of the State of Maryland and
     the Existing Warburg Fund is a validly existing series of shares of the RBB
     Fund representing interests in the Existing Warburg Fund under the laws  of
     the State of Maryland;
 
          (b)  The RBB Fund  is a registered investment  company classified as a
     management company  of the  open-end  type and  its registration  with  the
     Securities  and  Exchange Commission  (the  'Commission') as  an investment
     company under the  Investment Company Act  of 1940, as  amended (the  '1940
     Act'), is in full force and effect;
 
          (c)  The RBB Fund is not,  and the execution, delivery and performance
     of this Agreement will not result, in a violation of its Charter or By-Laws
     or any material agreement, indenture, instrument, contract, lease or  other
     undertaking  to which the RBB Fund or  any Existing Warburg Fund is a party
     or by which either of them or their property is bound;
 
          (d) The Existing Warburg  Fund has no  contracts or other  commitments
     (other  than this Agreement) which will be terminated with liability to the
     Existing Warburg Fund prior to the Closing Date;
 
          (e) Except as previously disclosed in  writing to and accepted by  the
     New   Warburg  Fund,   no  litigation   or  administrative   proceeding  or
     investigation of  or before  any court  or governmental  body is  presently
     pending or to its knowledge threatened against the Existing Warburg Fund or
     any  of  its properties  or assets  which,  if adversely  determined, would
     materially and adversely affect its  financial condition or the conduct  of
     its business. The RBB Fund knows of no facts which might form the basis for
     the  institution of such proceedings and is  not party to or subject to the
     provisions of any order,  decree or judgment of  any court or  governmental
     body which materially and adversely affects its business or the business of
     the  Existing Warburg  Fund or its  ability to  consummate the transactions
     herein contemplated;
 
          (f) The statements of assets  and liabilities of the Existing  Warburg
     Fund  for  the  six fiscal  years  ended  August 31,  1995  and  the period
     beginning with commencement of the Existing Warburg Fund and ending  August
     31,  1989 have been  audited by Coopers &  Lybrand L.L.P., certified public
     accountants, and  are  in  accordance with  generally  accepted  accounting
     principles  consistently applied, and such statements (copies of which have
     been furnished  to  the New  Warburg  Fund) fairly  reflect  the  financial
     condition  of the Existing Warburg Fund as  of such dates, and there are no
     known contingent liabilities of the Existing Warburg Fund as of such  dates
     not disclosed therein;
 
          (g)  Since August  31, 1995, there  has not been  any material adverse
     change  in  the  Existing  Warburg  Fund's  financial  condition,   assets,
     liabilities or business other than changes occurring in the ordinary course
     of business, or any incurrence by the Existing Warburg Fund of indebtedness
     maturing  more  than one  year  from the  date  that such  indebtedness was
     incurred, except as otherwise disclosed to and accepted by the New  Warburg
     Fund.  For the purposes  of this subparagraph  (g), a decline  in net asset
     value per share or  the total assets  of the Existing  Warburg Fund in  the
     ordinary course of business shall not constitute a material adverse change;
 
          (h) At the Closing Date, all federal and other tax returns and reports
     of  each Existing Warburg Fund  required by law to  have been filed by such
     dates shall have  been filed, and  all federal and  other taxes shall  have
     been  paid so far as due, or provision shall have been made for the payment
     thereof and, to the  best of the  RBB Fund's knowledge,  no such return  is
     currently  under audit and no assessment  has been asserted with respect to
     such returns;
 
          (i) For the  most recent fiscal  year of its  operation, the  Existing
     Warburg  Fund has  met the  requirements of  Subchapter M  of the  Code for
     qualification and treatment as a  regulated investment company; all of  the
     Existing Warburg Fund's issued and outstanding shares have been offered and
     sold  in compliance  in all material  respects with  applicable federal and
     state securities laws;
 
          (j) All issued and  outstanding shares of each  class of the  Existing
     Warburg  Fund are,  and at  the applicable Closing  Date will  be, duly and
     validly issued and outstanding, fully  paid and non-assessable. All of  the
     issued  and outstanding  shares of the  Existing Warburg Fund  will, at the
     time of Closing, be held  by the persons and the  amounts set forth in  the
     records of the transfer agent as
 
                                      A-4
 


<PAGE>
<PAGE>

     provided  in  paragraph  3.4.  The  Existing  Warburg  Fund  does  not have
     outstanding any  options, warrants  or  other rights  to subscribe  for  or
     purchase   any  of  the  Existing  Warburg  Fund's  shares,  nor  is  there
     outstanding any  security  convertible into  any  of the  Existing  Warburg
     Fund's shares;
 
          (k)  At the applicable Closing  Date, the RBB Fund  will have good and
     marketable title to the Existing Warburg Fund's assets to be transferred to
     the New Warburg Fund  pursuant to paragraph 1.2  and full right, power  and
     authority  to sell, assign, transfer and deliver such assets hereunder and,
     upon delivery  and payment  for  such assets,  the  New Warburg  Fund  will
     acquire  good and marketable  title thereto, subject  to no restrictions on
     the full transfer thereof, including such restrictions as might arise under
     the Securities Act  of 1933,  as amended (the  '1933 Act'),  other than  as
     disclosed to the New Warburg Fund.
 
          (l) The execution, delivery and performance of this Agreement has been
     duly  authorized by  all necessary  actions on the  part of  the RBB Fund's
     Board of Directors,  and subject to  the approval of  the Existing  Warburg
     Fund's  shareholders, this  Agreement will  constitute a  valid and binding
     obligation of  the RBB  Fund,  enforceable in  accordance with  its  terms,
     subject  to the  effect of  bankruptcy, insolvency,  fraudulent conveyance,
     reorganization,  moratorium  and  other  laws  relating  to  or   affecting
     creditors' rights and to general equity principles;
 
          (m)  The  information to  be  furnished by  the  RBB Fund  for  use in
     no-action  letters,   applications  for   exemptive  orders,   registration
     statements,  proxy materials and other documents  which may be necessary in
     connection with the transactions contemplated hereby shall be accurate  and
     complete in all material respects and shall comply in all material respects
     with   federal  securities  and  other   laws  and  regulations  thereunder
     applicable thereto;
 
          (n) The  proxy statement  of  the Existing  Warburg Fund  (the  'Proxy
     Statement')  to be  included in the  Registration Statement  referred to in
     paragraph 5.7  (other than  information  therein that  relates to  the  New
     Warburg Fund) will, on the effective date of the Registration Statement and
     on the Closing Date, not contain any untrue statement of a material fact or
     omit to state a material fact required to be stated therein or necessary to
     make the statements therein, in light of the circumstances under which such
     statements were made, not materially misleading.
 
     4.2.  The New Warburg Fund represents  and warrants to the Existing Warburg
Fund as follows:
 
          (a) The New Warburg  Fund is a  Maryland corporation, duly  organized,
     validly  existing  and in  good standing  under  the laws  of the  State of
     Maryland;
 
          (b) The New Warburg Fund is a registered investment company classified
     as a management company of the open-end type and its registration with  the
     Commission as an investment company under the 1940 Act is in full force and
     effect;
 
          (c)  The current  prospectus and  statement of  additional information
     filed as part of the New  Warburg Fund registration statement on Form  N-1A
     (the  'New Warburg  Fund Registration  Statement') conform  in all material
     respects to the applicable  requirements of the 1933  Act and the 1940  Act
     and  the  rules and  regulations of  the Commission  thereunder and  do not
     include any  untrue statement  of a  material  fact or  omit to  state  any
     material  fact  required to  be  stated therein  or  necessary to  make the
     statements therein, in  light of  the circumstances under  which they  were
     made, not materially misleading;
 
          (d)  At the  Closing Date,  the New  Warburg Fund  will have  good and
     marketable title to its assets;
 
          (e) The  New Warburg  Fund is  not, and  the execution,  delivery  and
     performance  of  this Agreement  will  not result,  in  a violation  of its
     Charter or  By-Laws  or  any  material  agreement,  indenture,  instrument,
     contract,  lease or other  undertaking to which  the New Warburg  Fund is a
     party or by which it is bound;
 
          (f) Except as previously disclosed in  writing to and accepted by  the
     RBB Fund, no litigation or administrative proceeding or investigation of or
     before  any  court or  governmental  body is  presently  pending or  to its
     knowledge threatened against the New Warburg Fund or any of its  properties
     or  assets which, if  adversely determined, would  materially and adversely
     affect its financial  condition or  the conduct  of its  business. The  New
     Warburg    Fund    knows   of    no    facts   which    might    form   the
 
                                      A-5
 


<PAGE>
<PAGE>

     basis for the  institution of such  proceedings and  is not a  party to  or
     subject  to the provisions of any order, decree or judgment of any court or
     governmental body which  materially and adversely  affects its business  or
     its ability to consummate the transactions contemplated herein;
 
          (g) Since the inception of the New Warburg Fund there has not been any
     material  adverse change with  respect to the  New Warburg Fund's financial
     condition, assets, liabilities or business other than changes occurring  in
     the  ordinary course of business, or any incurrence by the New Warburg Fund
     of indebtedness  maturing  more than  one  year  from the  date  that  such
     indebtedness  was incurred.  For the purposes  of this  subparagraph (h), a
     decline in net asset value per share or the total assets of the New Warburg
     Fund in the  ordinary course of  business shall not  constitute a  material
     adverse change;
 
          (h) At the Closing Date, all federal and other tax returns and reports
     of  the New Warburg Fund  required by law then to  be filed shall have been
     filed, and all federal  and other taxes  shown as due  on said returns  and
     reports  shall have  been paid  or provision shall  have been  made for the
     payment thereof;
 
          (i)  The  New  Warburg  Fund  intends  to  meet  the  requirements  of
     Subchapter  M of  the Code for  qualification and treatment  as a regulated
     investment company in the future;
 
          (j) At the date  hereof, all issued and  outstanding New Warburg  Fund
     Shares  are, and at the  Closing Date will be,  duly and validly issued and
     outstanding, fully  paid and  non-assessable,  with no  personal  liability
     attaching  to the  ownership thereof.  The New  Warburg Fund  does not have
     outstanding any  options, warrants  or  other rights  to subscribe  for  or
     purchase any New Warburg Fund Shares, nor is there outstanding any security
     convertible into any New Warburg Fund Shares;
 
          (k)  The execution, delivery  and performance of  this Agreement shall
     have been  duly authorized  prior  to the  Closing  Date by  all  necessary
     actions,  if any, on the part of  the New Warburg Fund's Board of Directors
     and the New Warburg Fund's shareholders, and this Agreement will constitute
     a valid  and binding  obligation of  the New  Warburg Fund  enforceable  in
     accordance with its terms, subject to the effect of bankruptcy, insolvency,
     fraudulent  conveyance, reorganization, moratorium  and other laws relating
     to or affecting creditors' rights and to general equity principles;
 
          (l) The New  Warburg Fund  Shares to be  issued and  delivered to  the
     Existing  Warburg  Fund, for  the account  of  the Existing  Warburg Fund's
     shareholders, pursuant to the terms of this Agreement, will at the  Closing
     Date  have been duly authorized and, when  so issued and delivered, will be
     duly and validly issued New Warburg Fund Shares, and will be fully paid and
     non-assessable with  no  personal  liability  attaching  to  the  ownership
     thereof;
 
          (m) The information to be furnished by the New Warburg Fund for use in
     no-action   letters,  applications   for  exemptive   orders,  registration
     statements, proxy materials and other  documents which may be necessary  in
     connection  with the transactions contemplated hereby shall be accurate and
     complete in all material respects and shall comply in all material respects
     with federal securities and other laws and regulations applicable thereto;
 
          (n) The Proxy Statement to  be included in the Registration  Statement
     referred to in paragraph 5.7 (only insofar as it relates to the New Warburg
     Fund)  will, on the effective date of the Registration Statement and on the
     Closing Date, not contain any untrue  statement of a material fact or  omit
     to state a material fact required to be stated therein or necessary to make
     the  statements therein,  in light  of the  circumstances under  which such
     statements were made, not materially misleading; and
 
          (o) The  New Warburg  Fund agrees  to use  all reasonable  efforts  to
     obtain  the approvals and authorizations required by the 1933 Act, the 1940
     Act and  such of  the state  Blue Sky  or securities  laws as  it may  deem
     appropriate in order to continue its operations after the Closing Date.
 
                                      A-6
 


<PAGE>
<PAGE>

5.  COVENANTS OF THE RBB FUND, THE NEW WARBURG FUND AND THE EXISTING WARBURG
    FUND
 
     5.1.  The New Warburg Fund and the  Existing Warburg Fund each will operate
its business in  the ordinary  course between the  date hereof  and the  Closing
Date.  It is understood that  such ordinary course of  business will include the
declaration and payment of customary dividends and distributions.
 
     5.2. The RBB  Fund, on behalf  of the  Existing Warburg Fund,  will call  a
meeting  of its shareholders to consider and act upon this Agreement and to take
all other actions in co-ordination with  the Existing Warburg Fund necessary  to
obtain approval of the transactions contemplated herein.
 
     5.3.  The RBB Fund, on behalf of  the Existing Warburg Fund, covenants that
the New Warburg Fund Shares  to be issued hereunder  are not being acquired  for
the purpose of making any distribution thereof other than in accordance with the
terms of this Agreement.
 
     5.4.  The RBB Fund, on behalf of the Existing Warburg Fund, will assist the
New Warburg  Fund  in  obtaining  such  information  as  the  New  Warburg  Fund
reasonably  requests concerning the beneficial ownership of the Existing Warburg
Fund's Shares.
 
     5.5. Subject to the provisions of this Agreement, the New Warburg Fund  and
the  RBB Fund each will take, or cause to  be taken, all action, and do or cause
to be done, all things reasonably  necessary, proper or advisable to  consummate
and make effective the transactions contemplated by this Agreement.
 
     5.6.  As promptly as practicable,  but in any case  within sixty days after
the Closing Date, the RBB Fund shall furnish the New Warburg Fund, in such  form
as  is  reasonably satisfactory  to the  New  Warburg Fund,  a statement  of the
earnings and  profits  of the  Existing  Warburg  Fund for  federal  income  tax
purposes  which will  be carried  over to the  New Warburg  Fund as  a result of
Section 381 of the  Code, and which  will be certified  by the Existing  Warburg
Fund's President and its Treasurer.
 
     5.7. The RBB Fund, on behalf of the Existing Warburg Fund, will provide the
New  Warburg Fund with information reasonably necessary for the preparation of a
prospectus (the 'Prospectus') which will include the Proxy Statement referred to
in paragraph 4.1(n), all to be included in a registration statement on Form N-14
of the New Warburg Fund (the  'Registration Statement'), in compliance with  the
1933  Act, the Securities Exchange Act of 1934 (the '1934 Act') and the 1940 Act
in connection  with the  meeting  of the  RBB  Fund's shareholders  to  consider
approval of this Agreement and the transactions contemplated herein.
 
     5.8. The RBB Fund, on behalf of the Existing Warburg Fund, will provide the
New  Warburg Fund with  information reasonably necessary  for the preparation of
the New Warburg Registration Statement.
 
     5.9. As promptly as practicable, but in any case within thirty days of  the
Closing  Date, the RBB Fund shall furnish  the New Warburg Fund with a statement
containing information required for purposes of complying with Rule 24f-2  under
the  1940 Act. A notice pursuant to Rule  24f-2 will be filed by the New Warburg
Fund offsetting redemptions by the Existing Warburg Fund during the fiscal  year
ending on or after the applicable Closing Date against sales of New Warburg Fund
Shares  and the  RBB Fund agrees  that it  will not net  redemptions during such
period by the Existing Warburg Fund against sales of shares of any other  series
of the RBB Fund.
 
     5.10. The New Warburg Fund agrees to indemnify and advance expenses to each
person  who at the time of the execution  of this Agreement serves as a Director
or Officer  ('Indemnified  Person')  of  the RBB  Fund,  against  money  damages
actually  and reasonably incurred by such  Indemnified Person in connection with
any claim that is asserted against  such Indemnified Person arising out of  such
person's  service  as a  director or  officer of  the RBB  Fund with  respect to
matters specifically relating to the  Existing Warburg Fund, provided that  such
indemnification  and advancement of  expenses shall be  permitted to the fullest
extent that is available  under the Maryland General  Corporation law and  other
applicable  law.  This paragraph  5.10 shall  not  protect any  such Indemnified
Person against any liability to the Existing Warburg Fund, the New Warburg  Fund
or  their  shareholders to  which he  would  otherwise be  subject by  reason of
willful misfeasance, bad faith, gross  negligence or from reckless disregard  of
the  duties involved in the conduct of his office. An Indemnified Person seeking
indemnification shall be  entitled to  advances from  the New  Warburg Fund  for
payment of the reasonable expenses incurred by him in connection with the matter
as   to  which  he  is  seeking  indemnification   in  the  manner  and  to  the
 
                                      A-7
 


<PAGE>
<PAGE>

fullest extent permissible under the Maryland General Corporation law and  other
applicable  law. Such Indemnified Person shall provide to the New Warburg Fund a
written affirmation  of his  good  faith belief  that  the standard  of  conduct
necessary for indemnification by the New Warburg Fund has been met and a written
undertaking  to repay any advance if it should ultimately be determined that the
standard of conduct has not been met. In addition, at least one of the following
additional conditions shall  be met:  (a) the Indemnified  Person shall  provide
security  in  form  and  amount  acceptable to  the  New  Warburg  Fund  for its
undertaking; (b)  the New  Warburg Fund  is insured  against losses  arising  by
reason  of the advance;  or (c) either  a majority of  a quorum of disinterested
non-party directors of  the New Warburg  Fund (collectively, the  'Disinterested
Directors'),  or independent legal  counsel experienced in  mutual fund matters,
selected by the Indemnified Person, in a written opinion, shall have determined,
based on a review of facts readily available to the New Warburg Fund at the time
the advance is proposed  to be made,  that there is reason  to believe that  the
Director will ultimately be found to be entitled to indemnification.
 
6.  CONDITIONS PRECEDENT TO OBLIGATIONS OF THE EXISTING WARBURG FUND
 
     The obligations of the RBB Fund to consummate the transactions provided for
herein  with  respect to  the Existing  Warburg  Fund shall  be subject,  at its
election, to the performance by the New  Warburg Fund of all of the  obligations
to  be performed by it hereunder on or  before the Closing Date and, in addition
thereto, the following further conditions:
 
          6.1. All  representations  and  warranties of  the  New  Warburg  Fund
     contained  in  this Agreement  shall be  true and  correct in  all material
     respects as of the date hereof and,  except as they may be affected by  the
     actions  contemplated by  this Agreement, as  of the Closing  Date with the
     same force and effect as if made on and as of the Closing Date;
 
          6.2. The  New Warburg  Fund shall  have delivered  to the  RBB Fund  a
     certificate executed in its name by its President or Vice President and its
     Secretary,   Treasurer  or  Assistant  Treasurer,   in  a  form  reasonably
     satisfactory to the  RBB Fund  and dated  as of  the Closing  Date, to  the
     effect that the representations and warranties of the New Warburg Fund made
     in  this Agreement  are true  and correct  at and  as of  the Closing Date,
     except as they  may be affected  by the transactions  contemplated by  this
     Agreement  and as to such other matters  as the Existing Warburg Fund shall
     reasonably request;
 
          6.3. The RBB  Fund shall  have received written  agreements from  PFPC
     Inc. and Counsellors Securities Inc. (or their affiliates) to maintain, for
     a one year period from the Closing Date, the expense ratios of the RBB Fund
     at  the average net expense ratio for the thirty days ending on the Closing
     Date. These  expense ratios  will  be in  effect  except for  increases  in
     expense  ratios due to redemptions of shares outside of the ordinary course
     of business; and
 
          6.4. The RBB Fund shall have received on the Closing Date a  favorable
     opinion  from Willkie  Farr & Gallagher,  counsel to the  New Warburg Fund,
     dated as of the Closing Date, in a form reasonably satisfactory to the  RBB
     Fund, covering the following points:
 
             That (a) the New Warburg Fund is a validly existing corporation and
        in  good  standing under  the laws  of  the State  of Maryland,  has the
        corporate power to own all of its properties and assets and to carry  on
        its  business as a registered investment  company; (b) the Agreement has
        been duly authorized,  executed and  delivered by the  New Warburg  Fund
        and,  assuming  that the  Prospectus,  Registration Statement  and Proxy
        Statement comply with the 1933  Act, the 1934 Act  and the 1940 Act  and
        the  rules and  regulations thereunder and,  assuming due authorization,
        execution and delivery of the Agreement by the other parties thereto, is
        a valid  and binding  obligation  of the  New Warburg  Fund  enforceable
        against  the New Warburg  Fund in accordance with  its terms, subject to
        the   effect   of   bankruptcy,   insolvency,   fraudulent   conveyance,
        reorganization,  moratorium  and  other laws  relating  to  or affecting
        creditors' rights generally  and to general  equity principles; (c)  the
        New  Warburg Fund  Shares to  be issued  to the  Existing Warburg Fund's
        shareholders as provided by this Agreement are duly authorized and  upon
        such  delivery will be validly issued and outstanding and are fully paid
        and non-assessable  with no  personal liability  attaching to  ownership
        thereof, and no shareholder of the
 
                                      A-8
 


<PAGE>
<PAGE>

        New  Warburg Fund has any preemptive  rights to subscription or purchase
        in respect thereof; (d) the execution and delivery of this Agreement did
        not, and the consummation of  the transactions contemplated hereby  will
        not,  result in a violation of the New Warburg Fund's Charter or By-Laws
        or in a material violation of  any provision of any agreement (known  to
        such counsel) to which the New Warburg Fund is a party or by which it or
        its  property is bound or,  to the knowledge of  such counsel, result in
        the acceleration of  any obligation  or the imposition  of any  penalty,
        under  any agreement, judgment, or decree  to which the New Warburg Fund
        is a party or by which it or its property is bound; (e) to the knowledge
        of such counsel,  no consent,  approval, authorization or  order of  any
        court  or  governmental  authority  of the  United  States  or  state of
        Maryland is required for the consummation by the New Warburg Fund of the
        actions contemplated herein, except such as have been obtained under the
        1933 Act, the 1934  Act and the  1940 Act, and such  as may be  required
        under  state securities laws; (f) only insofar as they relate to the New
        Warburg Fund, the descriptions in the Proxy Statement of statutes, legal
        and  governmental  proceedings,   investigations,  orders,  decrees   or
        judgments  of any  court or governmental  body in the  United States and
        contracts and other documents, if  any, are accurate and fairly  present
        the  information required to be shown; (g) such counsel does not know of
        any legal,  administrative or  governmental proceedings,  investigation,
        order,  decree  or  judgment of  any  court or  governmental  body, only
        insofar as  they  relate  to the  New  Warburg  Fund or  its  assets  or
        properties,  pending, threatened or otherwise  existing on or before the
        effective date of the Registration Statement or the Closing Date,  which
        are  required to  be described  in the  Registration Statement  or to be
        filed as exhibits to the Registration Statement which are not  described
        and  filed as  required; (h)  the New Warburg  Fund is  registered as an
        investment company  under the  1940 Act  and its  registration with  the
        Commission  as an investment company under the 1940 Act is in full force
        and  effect;  (i)  the  Proxy   Statement  and  the  New  Warburg   Fund
        Registration  Statement  (except as  to  financial and  statistical data
        contained therein, as to  which no opinion need  be given) comply as  to
        form in all material respects with the requirements of the 1933 Act, the
        1934  Act and the 1940 Act and the rules and regulations thereunder; and
        (j) the New Warburg Registration  Statement is effective under the  1933
        Act  and the 1940 Act and  no stop-order suspending its effectiveness or
        order pursuant to section 8(e) of the 1940 Act has been issued.
 
     In addition, such counsel also shall  state that they have participated  in
conferences  with officers and other representatives  of the New Warburg Fund at
which the contents  of the Proxy  Statement, the New  Warburg Fund  Registration
Statement  and related matters were discussed and, although they are not passing
upon and do  not assume  any responsibility  for the  accuracy, completeness  or
fairness  of the statements contained in the Proxy Statement and the New Warburg
Fund Registration Statement (except to the extent indicated in paragraph (f)  of
their  above opinion), on the basis of  the foregoing (relying as to materiality
to a large extent upon the opinions of officers and other representatives of the
New Warburg Fund),  they do not  believe that  the Proxy Statement  and the  New
Warburg Fund Registration Statement as of their respective dates, as of the date
of  the Existing Warburg Fund shareholders' meeting, and as of the Closing Date,
contained an untrue statement of a material fact or omitted to state a  material
fact  required to be stated therein regarding  the New Warburg Fund or necessary
to make the statements therein regarding the  New Warburg Fund, in the light  of
the circumstances under which they were made, not misleading.
 
     Such  opinion may state that  such counsel does not  express any opinion or
belief as to  the financial  statements or  other financial  data or  as to  the
information  relating  to  the Existing  Warburg  Fund, contained  in  the Proxy
Statement, Registration Statement  or New Warburg  Fund Registration  Statement,
and  that such opinion is solely for the  benefit of the RBB Fund, its Directors
and its officers. Such counsel  may rely as to matters  governed by the laws  of
the  state of Maryland on an opinion  of Maryland counsel and/or certificates of
officers or directors of each New Warburg Fund. Such opinion also shall  include
such  other  matters incident  to the  transaction  contemplated hereby,  as the
Existing Warburg Fund may reasonably request.
 
     In this paragraph 6.4, references to the Proxy Statement include and relate
only to the text of such Proxy Statement and not, except as specifically  stated
above,  to any exhibits or attachments  thereto or to any documents incorporated
by reference therein.
 
                                      A-9
 


<PAGE>
<PAGE>

7.  CONDITIONS PRECEDENT TO OBLIGATIONS OF THE NEW WARBURG FUND
 
     The obligations  of  the New  Warburg  Fund to  complete  the  transactions
provided for herein shall be subject, at its election, to the performance by the
Existing  Warburg Fund of all the obligations to be performed by it hereunder on
or before the Closing Date and, in addition thereto, the following conditions:
 
          7.1. All representations and warranties  of the RBB Fund contained  in
     this Agreement shall be true and correct in all material respects as of the
     date  hereof  and,  except as  they  may  be affected  by  the transactions
     contemplated by this Agreement, as of the Closing Date with the same  force
     and effect as if made on and as of the Closing Date;
 
          7.2.  The RBB  Fund shall  have delivered  to the  New Warburg  Fund a
     statement of the Existing Warburg  Fund's assets and liabilities,  together
     with a list of the Existing Warburg Fund's portfolio securities showing the
     tax  costs  of such  securities  by lot  and  the holding  periods  of such
     securities, as of the Closing Date, certified by the Treasurer or Assistant
     Treasurer of the RBB Fund;
 
          7.3. The RBB Fund shall have delivered to the New Warburg Fund on  the
     Closing  Date a  certificate executed  in its  name, and  on behalf  of the
     Existing Warburg Fund, by its President or Vice President and its Treasurer
     or Assistant  Treasurer, in  form  and substance  satisfactory to  the  New
     Warburg  Fund and  dated as  of the  Closing Date,  to the  effect that the
     representations and warranties of  the Existing Warburg  Fund made in  this
     Agreement  are true and  correct at and  as of the  Closing Date, except as
     they may be affected  by the transactions  contemplated by this  Agreement,
     and  as to  such other  matters as  the New  Warburg Fund  shall reasonably
     request; and
 
          7.4. The New Warburg  Fund shall have received  on the Closing Date  a
     favorable  opinion of Ballard Spahr Andrews & Ingersoll, counsel to the RBB
     Fund, in a  form satisfactory  to the Secretary  of the  New Warburg  Fund,
     covering the following points:
 
             That (a) the RBB Fund is a validly existing corporation and in good
        standing  under the laws of the State  of Maryland and has the statutory
        power to  own all  of its  properties and  assets and  to carry  on  its
        business  as a registered investment company; (b) the Agreement has been
        duly authorized, executed and delivered by the RBB Fund on behalf of the
        Existing  Warburg   Fund  and,   assuming  that   the  Prospectus,   the
        Registration Statement and the Proxy Statement comply with the 1933 Act,
        the  1934 Act and the 1940 Act  and the rules and regulations thereunder
        and, assuming due authorization, execution and delivery of the Agreement
        by the other parties  hereto, is a valid  and binding obligation of  the
        RBB  Fund enforceable against the RBB Fund in accordance with its terms,
        subject to the effect of bankruptcy, insolvency, fraudulent  conveyance,
        reorganization,  moratorium  and  other laws  relating  to  or affecting
        creditors' rights generally  and to general  equity principles; (c)  the
        execution and delivery of the Agreement did not, and the consummation of
        the  transactions contemplated hereby will not, result in a violation of
        the RBB  Fund's  Charter or  By-Laws  or  a material  violation  of  any
        provision of any agreement (known to such counsel) to which the RBB Fund
        or  the Existing Warburg Fund  is a party or by  which either of them or
        their properties are bound or, to the knowledge of such counsel,  result
        in  the acceleration of any obligation or the imposition of any penalty,
        under any agreement,  judgment or decree  to which the  RBB Fund or  the
        Existing  Warburg Fund is  a party or  by which either  of them or their
        properties are bound, (d) to the knowledge of such counsel, no  consent,
        approval,  authorization or order of any court or governmental authority
        of  the  United  States  or  state  of  Maryland  is  required  for  the
        consummation  by  the RBB  Fund  and the  Existing  Warburg Fund  of the
        transactions contemplated  herein, except  such  as have  been  obtained
        under  the 1933 Act, the 1934  Act and the 1940 Act,  and such as may be
        required under state securities laws; (e) only insofar as they relate to
        the RBB Fund  and the  Existing Warburg  Fund, the  descriptions in  the
        Proxy  Statement  under  the  captions  'Summary  --  Shareholder Voting
        Rights',  'Management  of  the  Fund',  'Information  on   Shareholders'
        Rights',  and 'Voting Information'  are accurate and  fairly present the
        information required to be shown; (f) such counsel does not know of  any
        legal, administrative or governmental proceedings, investigation, order,
        decree  or judgment of  any court or governmental  body, only insofar as
        they relate  to the  RBB Fund  or  the Existing  Warburg Fund  or  their
        respective assets or properties, pending,
 
                                      A-10
 


<PAGE>
<PAGE>

        threatened  or otherwise existing on or before the effective date of the
        Registration Statement or  the Closing  Date, which are  required to  be
        described  in the Registration  Statement or to be  filed as exhibits to
        the Registration Statement which are not described and filed as required
        or which materially  and adversely  affect the  Existing Warburg  Fund's
        business];  and (g) the RBB Fund  is registered as an investment company
        under the  1940 Act  and  its registration  with  the Commission  as  an
        investment company under the 1940 Act is in full force and effect.
 
     Such  counsel also shall  state that they  have participated in conferences
with officers and other representatives of the RBB Fund and the Existing Warburg
Fund at  which the  contents of  the Proxy  Statement and  related matters  were
discussed  and,  although  they are  not  passing  upon and  do  not  assume any
responsibility for  the accuracy,  completeness or  fairness of  the  statements
contained  in the Proxy  Statement (except to the  extent indicated in paragraph
(e) of  their above  opinion), on  the basis  of the  foregoing (relying  as  to
materiality  to  a  large  extent  upon  the  opinions  of  officers  and  other
representatives of the  Existing Warburg  Fund), they  do not  believe that  the
Proxy  Statement as of its  date, as of the date  of the Existing Warburg Fund's
shareholder meeting, and as of the  Closing Date, contained an untrue  statement
of  a material fact  or omitted to state  a material fact  required to be stated
therein regarding the RBB Fund or the Existing Warburg Fund or necessary in  the
light  of the circumstances under  which they were made,  to make the statements
therein regarding the RBB Fund and the Existing Warburg Fund not misleading.
 
     Such opinion may state  that such counsel does  not express any opinion  or
belief  as to  the financial statements  or other  financial data, or  as to the
information relating to the New Warburg  Fund, contained in the Proxy  Statement
or  Registration Statement, and that  such opinion is solely  for the benefit of
the New Warburg  Fund and its  directors and officers.  Such opinion also  shall
include  such other matters  incident to the  transaction contemplated hereby as
the New Warburg Fund may reasonably request.
 
     In this paragraph 7.4, references to the Proxy Statement include and relate
only to the text of such Proxy Statement and not to any exhibits or  attachments
thereto or to any documents incorporated by reference therein.
 
     7.5. The New Warburg Fund shall have received from Coopers & Lybrand L.L.P.
a letter addressed to the New Warburg Fund dated as of the effective date of the
Registration  Statement in  form and substance  satisfactory to  the New Warburg
Fund, to the effect that:
 
          (a) they are independent  public accountants with  respect to the  RBB
     Fund  within the  meaning of  the 1933  Act and  the applicable regulations
     thereunder;
 
          (b) in their opinion,  the financial statements  and per Share  income
     and  capital changes of the Existing  Warburg Fund included or incorporated
     by reference in the Registration Statement  and reported on by them  comply
     as  to  form  in  all  material  aspects  with  the  applicable  accounting
     requirements of the 1933 Act and the rules and regulations thereunder;
 
          (c) on the basis of limited procedures agreed upon by the New  Warburg
     Fund  and the RBB  Fund and described in  such letter (but  not an audit in
     accordance with generally accepted auditing standards) with respect to  the
     unaudited  pro  forma financial  statements  of the  Existing  Warburg Fund
     included in  the  Registration  Statement  and  the  Proxy  Statement,  and
     inquiries  of  appropriate officials  of the  RBB  Fund or  the director(s)
     thereof responsible for financial and  accounting matters, nothing came  to
     their  attention which caused  them to believe that  (i) such unaudited pro
     forma financial  statements  do not  comply  as  to form  in  all  material
     respects  with the applicable  accounting requirements of  the 1933 Act and
     the rules  and regulations  thereunder, or  (ii) such  unaudited pro  forma
     financial  statements are not fairly presented in conformity with generally
     accepted accounting principles applied on a basis substantially  consistent
     with that of the audited financial statements; and
 
          (d)  on the basis of limited procedures agreed upon by the New Warburg
     Fund and the RBB Fund and described in such letter (but not an  examination
     in  accordance with generally accepted auditing standards), the information
     relating to  the  Existing  Warburg  Fund  appearing  in  the  Registration
     Statement  and  the  Proxy  Statement  that  is  expressed  in  dollars  or
     percentages of dollars (with the exception of performance comparisons)  has
     been obtained from the accounting
 
                                      A-11
 


<PAGE>
<PAGE>

     records  of  such  Existing  Warburg Fund  or  from  schedules  prepared by
     officers of the RBB Fund having responsibility for financial and  reporting
     matters  and such information is in  agreement with such records, schedules
     or computations made therefrom.
 
     7.6. The RBB Fund shall have delivered to the New Warburg Fund, pursuant to
paragraph 4.1(f), copies of financial statements of the Existing Warburg Fund as
of and for its most recently completed fiscal year.
 
     7.7. The New Warburg Fund shall have received from Coopers & Lybrand LLP  a
letter  addressed to the New Warburg Fund and dated as of the applicable Closing
Date stating that as of a date no more than three (3) business days prior to the
applicable Closing Date, Coopers &  Lybrand LLP performed limited procedures  in
connection  with the RBB  Fund's most recent  unaudited financial statements and
that (a) nothing came to their  attention in performing such limited  procedures
or  otherwise that led  them to believe that  there had been  any changes in the
assets, liabilities, net assets, net investment income, net increase  (decrease)
in  net  assets from  operations or  net  increase (decrease)  in net  assets as
compared with amounts  as of  the Existing  Warburg Fund's  most recent  audited
fiscal  year end or the corresponding period in the Existing Warburg Fund's most
recent audited fiscal year, other than changes occurring in the ordinary  course
of  business, and (b)  based on such  limited procedures, there  is no change in
their report on the  most recent audited financial  statements of such  Existing
Warburg Fund.
 
     7.8.  The Board of Directors  of the RBB Fund,  including a majority of the
directors who are not 'interested  persons' of the RBB  Fund (as defined by  the
1940  Act),  shall  have determined  that  this Agreement  and  the transactions
contemplated hereby are in the best interests  of the RBB Fund and the  Existing
Warburg  Fund and that the interests of the shareholders in the RBB Fund and the
Existing Warburg Fund would not be diluted as a result of such transactions, and
the RBB Fund  shall have delivered  to the  New Warburg Fund  at the  applicable
Closing, a certificate, executed by an officer, to the effect that the condition
described in this subparagraph has been satisfied.
 
8.  FURTHER CONDITIONS PRECEDENT TO OBLIGATIONS OF THE NEW WARBURG FUND AND THE
    EXISTING WARBURG FUND
 
     If  any of  the conditions set  forth below do  not exist on  or before the
Closing Date with respect to the New Warburg Fund, the RBB Fund on behalf of the
Existing Warburg Fund shall, and  if any of such conditions  do not exist on  or
before  the Closing  Date with  respect to  the Existing  Warburg Fund,  the New
Warburg Fund shall, at  their respective option, not  be required to  consummate
the transactions contemplated by this Agreement:
 
          8.1. The Agreement and the transactions contemplated herein shall have
     been  approved  by the  requisite vote  of the  holders of  the outstanding
     Shares of the Existing  Warburg Fund in accordance  with the provisions  of
     the RBB Fund's Charter and applicable law and certified copies of the votes
     evidencing such approval shall have been delivered to the New Warburg Fund.
 
          8.2.  On the Closing Date no action, suit or other proceeding shall be
     pending before any court  or governmental agency in  which it is sought  to
     restrain or prohibit, or obtain damages or other relief in connection with,
     this Agreement or the transactions contemplated herein.
 
          8.3.  All consents of other parties and all other consents, orders and
     permits of federal, state and local regulatory authorities (including those
     of the  Commission  and  of  state blue  sky  and  securities  authorities,
     including  'no-action' positions of and  exemptive orders from such federal
     and state authorities) deemed necessary by the New Warburg Fund or the  RBB
     Fund  to permit consummation, in all material respects, of the transactions
     contemplated hereby  shall  have been  obtained,  except where  failure  to
     obtain  any such  consent, order or  permit would  not involve a  risk of a
     material adverse effect on the assets or properties of the New Warburg Fund
     or the Existing  Warburg Fund, provided  that either party  hereto may  for
     itself waive any of such conditions.
 
          8.4.  The Registration Statement and the New Warburg Fund Registration
     Statement shall each have become effective  under the 1933 Act and no  stop
     orders  suspending the effectiveness thereof shall have been issued and, to
     the best knowledge of  the parties hereto,  no investigation or  proceeding
     for  that purpose shall  have been instituted or  be pending, threatened or
     contemplated under the 1933 Act.
 
                                      A-12
 


<PAGE>
<PAGE>

          8.5. The parties shall  have received a  favorable opinion of  Willkie
     Farr  & Gallagher, addressed to, and in form and substance satisfactory to,
     the RBB Fund, on behalf of the  Existing Warburg Fund, and the New  Warburg
     Fund, substantially to the effect that for federal income tax purposes:
 
             (a)  The  transfer  of all  or  substantially all  of  the Existing
        Warburg Fund's assets in  exchange for the New  Warburg Fund Shares  and
        the  assumption by the  New Warburg Fund of  liabilities of the Existing
        Warburg Fund will  constitute a 'reorganization'  within the meaning  of
        Section  368(a) of the  Code and the  New Warburg Fund  and the Existing
        Warburg Fund are each a 'party  to a reorganization' within the  meaning
        of Section 368(b) of the Code; (b) no gain or loss will be recognized by
        the  New Warburg  Fund upon  the receipt of  the assets  of the Existing
        Warburg Fund solely in exchange for the New Warburg Fund Shares and  the
        assumption  by  the  New Warburg  Fund  of liabilities  of  the Existing
        Warburg Fund; (c)  no gain or  loss will be  recognized by the  Existing
        Warburg  Fund upon the transfer of the Existing Warburg Fund's assets to
        the New Warburg Fund in exchange for the New Warburg Fund Shares and the
        assumption by  the  New Warburg  Fund  of liabilities  of  the  Existing
        Warburg  Fund or upon the  distribution (whether actual or constructive)
        of  the  New  Warburg  Fund  Shares  to  the  Existing  Warburg   Fund's
        shareholders  in exchange for their shares of the Existing Warburg Fund;
        (d) no gain or loss will  be recognized by shareholders of the  Existing
        Warburg Fund upon the exchange of their Existing Warburg Fund shares for
        the  New Warburg Fund Shares and the  assumption by the New Warburg Fund
        of liabilities of the Existing Warburg Fund; (e) the aggregate tax basis
        for the New Warburg Fund Shares received by each of the Existing Warburg
        Fund's shareholders pursuant to the  Reorganization will be the same  as
        the aggregate tax basis of the Existing Warburg Fund Shares held by such
        shareholder  immediately prior  to the  Reorganization, and  the holding
        period of the New  Warburg Fund Shares to  be received by each  Existing
        Warburg  Fund  shareholder  will  include the  period  during  which the
        Existing Warburg  Fund  Shares  exchanged therefor  were  held  by  such
        shareholder (provided that the Existing Warburg Fund Shares were held as
        capital assets on the date of the Reorganization); and (f) the tax basis
        of  the Existing Warburg Fund's assets  acquired by the New Warburg Fund
        will be the same as the tax basis of such assets to the Existing Warburg
        Fund immediately prior to the Reorganization, and the holding period  of
        the  assets of the Existing Warburg Fund in the hands of the New Warburg
        Fund will include the period during which those assets were held by  the
        Existing Warburg Fund.
 
     Notwithstanding  anything herein to  the contrary, neither  the New Warburg
Fund nor the RBB Fund may waive the conditions set forth in this paragraph 8.5.
 
9.  BROKERAGE FEES AND EXPENSES; OTHER AGREEMENTS
 
     9.1. The New Warburg Fund represents  and warrants to the Existing  Warburg
Fund,  and the RBB  Fund on behalf  of the Existing  Warburg Fund represents and
warrants to the New Warburg Fund, that there are no brokers or finders or  other
entities  to receive any  payments in connection  with the transactions provided
for herein.
 
     9.2. Warburg, Pincus Counsellors, Inc. ('Warburg') or its affiliates agrees
to bear the expenses incurred  in connection with the transactions  contemplated
by  this Agreement, whether or not consummated (excluding extraordinary expenses
such as litigation expenses, damages and other expenses not normally  associated
with  transactions of the  type contemplated by  this Agreement). These expenses
consist  of:  (i)  expenses  associated  with  preparing  this  Agreement,   the
Registration  Statement and expenses of the shareholder meetings; (ii) preparing
and filing the New Warburg Registration Statement covering the Fund Shares to be
issued in  the  Reorganization; (iii)  registration  or qualification  fees  and
expenses  of preparing and filing such forms, if any, necessary under applicable
state securities laws to  qualify the New  Warburg Fund Shares  to be issued  in
connection with the Reorganization; (iv) postage; printing; accounting fees; and
legal  fees incurred  in connection with  the transactions  contemplated by this
Agreement; (v) solicitation costs incurred  in connection with the  shareholders
meeting  referred to in clause  (i) above and paragraph  5.2 hereof and (vi) any
other Reorganization expenses.
 
                                      A-13
 


<PAGE>
<PAGE>

     9.3. (a) Warburg agrees to indemnify  and hold harmless each person who  at
the time of execution of this Agreement is a director or officer of the RBB Fund
(a 'Warburg Indemnified Party') from and against any and all direct and indirect
liabilities,   losses,   claims,  damages   and  expenses   (including,  without
limitation,  reasonable  attorneys'  fees)  ('Losses')  incurred  by  a  Warburg
Indemnified  Party and that arise from or relate to the operations commencing on
the first business  day after the  Closing Date  of the New  Warburg Fund.  This
indemnification  provision shall only cover Losses  that have not been recovered
by the Warburg Indemnified Party against the New Warburg Fund after a reasonable
period of time following a written request  to do so by the Warburg  Indemnified
Party.
 
     (b)  Warburg's  agreement  to  indemnify  the  Warburg  Indemnified Parties
pursuant to this  paragraph 9.3  is expressly conditioned  upon Warburg's  being
promptly  notified of any action  or claim brought against  any such party after
the Warburg Indemnified Party  receives notice of the  action. The failure of  a
Warburg  Indemnified Party to notify Warburg  shall not relieve Warburg from any
liability  that   Warburg  may   have  otherwise   than  on   account  of   this
indemnification agreement.
 
     (c)  In  case any  action or  claim  shall be  brought against  any Warburg
Indemnified Party  and  it  shall  timely notify  Warburg  of  the  commencement
thereof, Warburg shall be entitled to participate in, and, to the extent that it
shall  wish to do so, to assume the defense thereof with counsel satisfactory to
it. If Warburg opts to  assume the defense of such  action, Warburg will not  be
liable  to  the  Warburg  Indemnified  Party for  any  legal  or  other expenses
subsequently incurred by the  Warburg Indemnified Party  in connection with  the
defense  thereof  other  than  (1)  reasonable  costs  of  investigation  or the
furnishing of documents or witnesses and (2) all reasonable fees and expenses of
separate counsel to such  Warburg Indemnified Party  if the Warburg  Indemnified
Party  shall have  concluded reasonably that  representation of  Warburg and the
Warburg Indemnified Party  by the  same counsel  would be  inappropriate due  to
actual  or  potential differing  interests between  them in  the conduct  of the
defense of such action.
 
10.  ENTIRE AGREEMENT; SURVIVAL OF WARRANTIES
 
     10.1. The New Warburg Fund  and the RBB Fund, itself  and on behalf of  the
Existing  Warburg Fund,  agree that neither  party has  made any representation,
warranty or covenant not  set forth herein and  that this Agreement  constitutes
the entire agreement among the parties.
 
     10.2.  The  representations,  warranties and  covenants  contained  in this
Agreement or in any document delivered pursuant hereto or in connection herewith
shall survive the consummation of the transactions contemplated hereunder.
 
11.  TERMINATION
 
     11.1. This Agreement  may be  terminated at  any time  at or  prior to  the
Closing Date by: (1) mutual agreement of the RBB Fund, on behalf of the Existing
Warburg  Fund, and  the New  Warburg Fund; (2)  the RBB  Fund, on  behalf of the
Existing Warburg Fund,  in the  event the  New Warburg  Fund shall,  or the  New
Warburg  Fund in  the event  the RBB  Fund or  the Existing  Warburg Fund shall,
materially breach any representation, warranty or agreement contained herein  to
be  performed at or prior to the Closing Date; or (3) the RBB Fund, on behalf of
the Existing Warburg Fund, or the New  Warburg Fund, or the New Warburg Fund  in
the event a condition herein expressed to be precedent to the obligations of the
terminating  party or parties has not been met and it reasonably appears that it
will not or cannot be met.
 
     11.2. In the event of any such termination, there shall be no liability for
damages on the part  of either the New  Warburg Fund or the  RBB Fund, or  their
respective directors or officers, to the other party or parties.
 
12.  AMENDMENTS
 
     This  Agreement may be amended, modified or supplemented in writing in such
manner as may  be mutually agreed  upon by  the authorized officers  of the  New
Warburg  Fund and the RBB Fund; provided, however, that following the meeting of
the Existing Warburg Fund's shareholders called by
 
                                      A-14
 


<PAGE>
<PAGE>

the RBB Fund pursuant to paragraph 5.2  of this Agreement no such amendment  may
have the effect of changing the provisions for determining the number of the New
Warburg  Fund Shares  to be issued  to the Existing  Warburg Fund's Shareholders
under this Agreement to the detriment of such shareholders without their further
approval.
 
13.  NOTICES
 
     13.1. Any notice, report, statement or demand required or permitted by  any
provisions  of this Agreement shall be in  writing and shall be given by prepaid
telegraph, telecopy  or certified  mail addressed  to the  RBB Fund  and/or  the
Existing Warburg Fund at:
 
        Bellevue Park Corporate Center
        400 Bellevue Parkway
        Suite 100
        Wilmington, DE 19809
        Attention: Edward Roach
 
        with a copy to:
 
        John N. Ake, Esq.
        Ballard Spahr Andrews & Ingersoll
        1735 Market Street, 51st Floor
        Philadelphia, PA 19101
 
or to the New Warburg Fund at:
 
        466 Lexington Avenue
        New York, NY 10017
        Attention: Arnold M. Reichman
 
        with a copy to:
 
        Rose F. DiMartino, Esq.
        Willkie Farr & Gallagher
        153 East 53rd Street
        New York, NY 10022
 
14.  HEADINGS; COUNTERPARTS; GOVERNING LAW; ASSIGNMENT; LIMITATION OF LIABILITY
 
     14.1.  The article and  paragraph headings contained  in this Agreement are
for reference purposes  only and  shall not  affect in  any way  the meaning  or
interpretation of this Agreement.
 
     14.2. This Agreement may be executed in any number of counterparts, each of
which shall be deemed an original.
 
     14.3.  This Agreement shall be governed by and construed in accordance with
the laws of the State of Delaware.
 
     14.4. This Agreement  shall bind and  inure to the  benefit of the  parties
hereto  and  their  respective  successors and  assigns,  but  no  assignment or
transfer hereof or of any rights or  obligations hereunder shall be made by  any
party  without the written consent of  the other party. Nothing herein expressed
or implied is intended or shall be construed to confer upon or give any  person,
firm  or  corporation,  other  than  the  parties  hereto  and  their respective
successors and  assigns, any  rights or  remedies  under or  by reason  of  this
Agreement.
 
                                      A-15
 


<PAGE>
<PAGE>

     IN WITNESS WHEREOF, each of the parties hereto has caused this Agreement to
be  executed  by its  Chairman of  the  Board, President  or Vice  President and
attested to by its Secretary or Assistant Secretary.
 
WARBURG, PINCUS  ................
FUND, INC.
 
By:
     .................................
    NAME:
 
    TITLE:
 
Attest:  .............................
THE RBB FUND, INC., for itself and
on behalf of the Warburg, Pincus
 ..................... Fund
 
By:
     .................................
 
    NAME:
 
    TITLE:
 
Attest:  .............................
Solely with respect to paragraphs 9.2
and 9.3:
 
WARBURG, PINCUS COUNSELLORS, INC.
 
By:
     .................................
 
    NAME:
 
    TITLE:
 
Attest:  .............................
 
                                      A-16
 


<PAGE>
<PAGE>

                                                                      SCHEDULE A
 
<TABLE>
<CAPTION>
                 EXISTING WARBURG FUND                                        NEW WARBURG FUND
- --------------------------------------------------------  --------------------------------------------------------
 
<S>                                                       <C>
Warburg Pincus  ................. Fund, a series of the
  RBB Fund..............................................  Warburg, Pincus  ................. Fund, Inc.
 
Warburg Pincus Class....................................  Common Shares
 
Warburg Pincus Series 2 Class...........................  Series 2 Shares
</TABLE>
 
                                      A-17

<PAGE>




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