OPPENHEIMER MIDCAP FUND
NSAR-B, 1999-12-30
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SIGNATURE   BRIAN W. WIXTED
TITLE       TREASURER



                        Report of Independent Accountants


To the Board of Trustees and Shareholders of
  Oppenheimer MidCap Fund

In planning and performing our audit of the financial  statements of Oppenheimer
MidCap Fund for the year ended  October 31,  1999,  we  considered  its internal
control,  including control activities for safeguarding securities,  in order to
determine our auditing  procedures  for the purpose of expressing our opinion on
the financial  statements and to comply with the requirements of Form N-SAR, not
to provide assurance on internal control.

The management of Oppenheimer  MidCap Fund is responsible for  establishing  and
maintaining internal control. In fulfilling this  responsibility,  estimates and
judgments by management are required to assess the expected benefits and related
costs of controls.  Generally, controls that are relevant to an audit pertain to
the entity's objective of preparing  financial  statements for external purposes
that are fairly  presented in  conformity  with  generally  accepted  accounting
principles.   Those  controls   include  the   safeguarding  of  assets  against
unauthorized acquisition, use or disposition.

Because of inherent  limitations in internal control,  errors or fraud may occur
and not be detected.  Also,  projection of any evaluation of internal control to
future periods is subject to the risk that it may become  inadequate  because of
changes in conditions or that the  effectiveness of the design and operation may
deteriorate.

Our consideration of internal control would not necessarily disclose all matters
in  internal   control  that  might  be  material   weaknesses  under  standards
established  by the  American  Institute  of  Certified  Public  Accountants.  A
material weakness is a condition in which the design or operation of one or more
of the internal control components does not reduce to a relatively low level the
risk  that  misstatements  caused  by error or fraud in  amounts  that  would be
material in relation to the financial statements being audited may occur and not
be  detected  within a timely  period  by  employees  in the  normal  course  of
performing  their assigned  functions.  However,  we noted no matters  involving
internal  control  and  its  operation,   including  controls  for  safeguarding
securities,  that we consider to be material  weaknesses  as defined above as of
October 31, 1999.

This  report is  intended  solely  for the  information  and use of the Board of
Trustees,  management  and the  Securities  and Exchange  Commission  and is not
intended  to be and  should not be used by anyone  other  than  these  specified
parties.



PricewaterhouseCoopers LLP

Denver, Colorado
November 19, 1999


     The Fund adjusts the  classification  of  distributions  to shareholders to
reflect the differences  between  financial  statement amounts and distributions
determined in accordance with income tax  regulations.  Accordingly,  during the
year  ended  October  31,  1999,  amounts  have been  reclassified  to reflect a
decrease  in paid-in  capital of  $911,479,  a decrease in  overdistributed  net
investment  income of $908,111,  and a decrease in accumulated net realized loss
on investments of $3,368.

WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK>               1041101
<NAME>              OPPENHEIMER MID-CAP FUND-A

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<PERIOD-TYPE>                                                           12-MOS
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<EXPENSE-RATIO>                                                                              1.40
[AVG-DEBT-OUTSTANDING]                                                                          0
[AVG-DEBT-PER-SHARE]                                                                         0.00


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK>               1041101
<NAME>              OPPENHEIMER MID-CAP FUND-B

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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK>               1041101
<NAME>              OPPENHEIMER MID-CAP FUND-C

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[AVG-DEBT-OUTSTANDING]                                                                          0
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK>               1041101
<NAME>              OPPENHEIMER MID-CAP FUND-Y

<S>                                                                     <C>
<PERIOD-TYPE>                                                           12-MOS
<FISCAL-YEAR-END>                                                       OCT-31-1999
<PERIOD-START>                                                          NOV-01-1998
<PERIOD-END>                                                            OCT-31-1999
<INVESTMENTS-AT-COST>                                                                 245,545,947
<INVESTMENTS-AT-VALUE>                                                                311,343,335
<RECEIVABLES>                                                                           8,357,137
<ASSETS-OTHER>                                                                              2,027
<OTHER-ITEMS-ASSETS>                                                                       51,788
<TOTAL-ASSETS>                                                                        319,754,287
<PAYABLE-FOR-SECURITIES>                                                                6,199,506
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                                       0
<TOTAL-LIABILITIES>                                                                     6,780,705
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                              253,629,991
<SHARES-COMMON-STOCK>                                                                         100
<SHARES-COMMON-PRIOR>                                                                         100
<ACCUMULATED-NII-CURRENT>                                                                       0
<OVERDISTRIBUTION-NII>                                                                      6,808
<ACCUMULATED-NET-GAINS>                                                                (6,446,989)
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                               65,797,388
<NET-ASSETS>                                                                                2,007
<DIVIDEND-INCOME>                                                                         203,711
<INTEREST-INCOME>                                                                         796,212
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                          1,914,842
<NET-INVESTMENT-INCOME>                                                                  (914,919)
<REALIZED-GAINS-CURRENT>                                                               (3,595,944)
<APPREC-INCREASE-CURRENT>                                                              65,603,264
<NET-CHANGE-FROM-OPS>                                                                  61,092,401
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                                       0
<DISTRIBUTIONS-OF-GAINS>                                                                        0
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                         0
<NUMBER-OF-SHARES-REDEEMED>                                                                     0
<SHARES-REINVESTED>                                                                             0
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<ACCUMULATED-NII-PRIOR>                                                                         0
<ACCUMULATED-GAINS-PRIOR>                                                              (2,813,668)
<OVERDISTRIB-NII-PRIOR>                                                                         0
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                     817,885
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                         1,919,261
<AVERAGE-NET-ASSETS>                                                                        2,000
<PER-SHARE-NAV-BEGIN>                                                                       10.88
<PER-SHARE-NII>                                                                             (0.01)
<PER-SHARE-GAIN-APPREC>                                                                      9.22
<PER-SHARE-DIVIDEND>                                                                         0.00
<PER-SHARE-DISTRIBUTIONS>                                                                    0.02
<RETURNS-OF-CAPITAL>                                                                         0.00
<PER-SHARE-NAV-END>                                                                         20.07
<EXPENSE-RATIO>                                                                              1.03
[AVG-DEBT-OUTSTANDING]                                                                          0
[AVG-DEBT-PER-SHARE]                                                                         0.00


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