UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM N-CSR

              CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT
                              INVESTMENT COMPANIES

                  Investment Company Act file number 811-08297
                                                     ---------

                             OPPENHEIMER MIDCAP FUND
                             -----------------------
               (Exact name of registrant as specified in charter)

             6803 SOUTH TUCSON WAY, CENTENNIAL, COLORADO 80112-3924
             ------------------------------------------------------
               (Address of principal executive offices) (Zip code)

                              Robert G. Zack, Esq.
                             OppenheimerFunds, Inc.
            TWO WORLD FINANCIAL CENTER, NEW YORK, NEW YORK 10281-1008
            ---------------------------------------------------------
                     (Name and address of agent for service)

       Registrant's telephone number, including area code: (303) 768-3200
                                                           --------------

                       Date of fiscal year end: OCTOBER 31
                                                ----------

                      Date of reporting period: 04/30/2007
                                                ----------



ITEM 1.  REPORTS TO STOCKHOLDERS.


TOP HOLDINGS AND ALLOCATIONS
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

TOP TEN COMMON STOCK INDUSTRIES
- --------------------------------------------------------------------------------
Software                                                                    9.2%
- --------------------------------------------------------------------------------
Specialty Retail                                                            7.9
- --------------------------------------------------------------------------------
Health Care Equipment & Supplies                                            7.2
- --------------------------------------------------------------------------------
IT Services                                                                 6.0
- --------------------------------------------------------------------------------
Capital Markets                                                             5.0
- --------------------------------------------------------------------------------
Commercial Banks                                                            5.0
- --------------------------------------------------------------------------------
Health Care Providers & Services                                            4.2
- --------------------------------------------------------------------------------
Electronic Equipment & Instruments                                          4.1
- --------------------------------------------------------------------------------
Semiconductors & Semiconductor Equipment                                    4.0
- --------------------------------------------------------------------------------
Insurance                                                                   3.8

Portfolio holdings and allocations are subject to change. Percentages are as of
April 30, 2007, and are based on net assets.

TOP TEN COMMON STOCK HOLDINGS
- --------------------------------------------------------------------------------
Alliance Data Systems Corp.                                                 2.9%
- --------------------------------------------------------------------------------
Bard (C.R.), Inc.                                                           2.9
- --------------------------------------------------------------------------------
O'Reilly Automotive, Inc.                                                   2.9
- --------------------------------------------------------------------------------
Microchip Technology, Inc.                                                  2.8
- --------------------------------------------------------------------------------
Stericycle, Inc.                                                            2.7
- --------------------------------------------------------------------------------
Rockwell Collins, Inc.                                                      2.6
- --------------------------------------------------------------------------------
Coventry Health Care, Inc.                                                  2.4
- --------------------------------------------------------------------------------
Fastenal Co.                                                                2.4
- --------------------------------------------------------------------------------
Covance, Inc.                                                               2.4
- --------------------------------------------------------------------------------
Polo Ralph Lauren Corp., Cl. A                                              2.3

Portfolio holdings and allocations are subject to change. Percentages are as of
April 30, 2007, and are based on net assets.

For up-to-date Top 10 Fund Holdings, please visit www.oppenheimerfunds.com.

- --------------------------------------------------------------------------------


                          10 | OPPENHEIMER MIDCAP FUND



- --------------------------------------------------------------------------------

SECTOR ALLOCATION

  [THE FOLLOWING TABLE WAS REPRESENTED BY A PIE CHART IN THE PRINTED MATERIAL.]

Information Technology             26.3%
   Software                         9.5
   IT Services                      6.2
   Electronic Equipment
   & Instruments                    4.3
   Semiconductors
   & Semiconductor Equipment        4.1
   Internet Software & Services     1.9
   Computers & Peripherals          0.3
Financials                         17.8
Health Care                        16.9
Industrials                        14.3
Consumer Discretionary             14.1
Energy                              4.8
Materials                           3.7
Telecommunication Services          1.8
Utilities                           0.3

Portfolio holdings and allocations are subject to change. Percentages are as of
April 30, 2007, and are based on the total market value of common stocks.

- --------------------------------------------------------------------------------


                          11 | OPPENHEIMER MIDCAP FUND



NOTES
- --------------------------------------------------------------------------------

Total returns include changes in share price and reinvestment of dividends and
capital gains distributions in a hypothetical investment for the periods shown.
Cumulative total returns are not annualized. The Fund's total returns shown do
not reflect the deduction of income taxes on an individual's investment. Taxes
may reduce your actual investment returns on income or gains paid by the Fund or
any gains you may realize if you sell your shares. INVESTORS SHOULD CONSIDER THE
FUND'S INVESTMENT OBJECTIVES, RISKS AND OTHER CHARGES AND EXPENSES CAREFULLY
BEFORE INVESTING. THE FUND'S PROSPECTUS CONTAINS THIS AND OTHER INFORMATION
ABOUT THE FUND, AND MAY BE OBTAINED BY ASKING YOUR FINANCIAL ADVISOR, CALLING US
AT 1.800.525.7048 OR VISITING OUR WEBSITE AT WWW.OPPENHEIMERFUNDS.COM. READ THE
PROSPECTUS CAREFULLY BEFORE INVESTING.

The Fund's investment strategy and focus can change over time. The mention of
specific fund holdings does not constitute a recommendation by OppenheimerFunds,
Inc.

CLASS A shares of the Fund were first publicly offered on 12/1/97. Unless
otherwise noted, Class A returns include the current maximum initial sales
charge of 5.75%.

CLASS B shares of the Fund were first publicly offered on 12/1/97. Unless
otherwise noted, Class B returns include the applicable contingent deferred
sales charge of 5% (1-year) and 2% (5-year). Class B shares are subject to an
annual 0.75% asset-based sales charge. Because Class B shares convert to Class A
shares 72 months after purchase, the "since inception" return for Class B uses
Class A performance for the period after conversion.

CLASS C shares of the Fund were first publicly offered on 12/1/97. Unless
otherwise noted, Class C returns include the contingent deferred sales charge of
1% for the 1-year period. Class C shares are subject to an annual 0.75%
asset-based sales charge.

CLASS N shares of the Fund were first publicly offered on 3/1/01. Class N shares
are offered only through retirement plans. Unless otherwise noted, Class N
returns include the contingent deferred sales charge of 1% for the 1-year
period. Class N shares are subject to an annual 0.25% asset-based sales charge.


                          12 | OPPENHEIMER MIDCAP FUND



CLASS Y shares of the Fund were first publicly offered on 12/1/97. Class Y
shares are offered only to certain institutional investors under special
agreement with the Distributor.

An explanation of the  calculation of performance is in the Fund's  Statement of
Additional Information.


                          13 | OPPENHEIMER MIDCAP FUND



FUND EXPENSES
- --------------------------------------------------------------------------------

FUND EXPENSES. As a shareholder of the Fund, you incur two types of costs: (1)
transaction costs, which may include sales charges (loads) on purchase payments,
contingent deferred sales charges on redemptions; and redemption fees, if any;
and (2) ongoing costs, including management fees; distribution and service fees;
and other Fund expenses. These examples are intended to help you understand your
ongoing costs (in dollars) of investing in the Fund and to compare these costs
with the ongoing costs of investing in other mutual funds.

The examples are based on an investment of $1,000.00 invested at the beginning
of the period and held for the entire 6-month period ended April 30, 2007.

ACTUAL EXPENSES. The "actual" lines of the table provide information about
actual account values and actual expenses. You may use the information on this
line for the class of shares you hold, together with the amount you invested, to
estimate the expense that you paid over the period. Simply divide your account
value by $1,000.00 (for example, an $8,600.00 account value divided by $1,000.00
= 8.60), then multiply the result by the number in the "actual" line under the
heading entitled "Expenses Paid During Period" to estimate the expenses you paid
on your account during this period.

HYPOTHETICAL EXAMPLE FOR COMPARISON PURPOSES. The "hypothetical" lines of the
table provide information about hypothetical account values and hypothetical
expenses based on the Fund's actual expense ratio for each class of shares, and
an assumed rate of return of 5% per year before expenses, which is not the
Fund's actual return. The hypothetical account values and expenses may not be
used to estimate the actual ending account balance or expenses you paid for the
period. You may use this information to compare the ongoing costs of investing
in the Fund and other funds. To do so, compare this 5% hypothetical example for
the class of shares you hold with the 5% hypothetical examples that appear in
the shareholder reports of the other funds.

Please note that the expenses shown in the table are meant to highlight your
ongoing costs only and do not reflect any transactional costs, such as front-end
or contingent deferred sales charges (loads), or a $12.00 fee imposed annually
on accounts valued at less than $500.00 (subject to exceptions described in


                          14 | OPPENHEIMER MIDCAP FUND



the Statement of Additional Information). Therefore, the "hypothetical" lines of
the table are useful in comparing ongoing costs only, and will not help you
determine the relative total costs of owning different funds. In addition, if
these transactional costs were included, your costs would have been higher.

- --------------------------------------------------------------------------------

                                 BEGINNING     ENDING        EXPENSES
                                 ACCOUNT       ACCOUNT       PAID DURING
                                 VALUE         VALUE         6 MONTHS ENDED
                                 (11/1/06)     (4/30/07)     APRIL 30, 2007
- ----------------------------------------------------------------------------
Class A Actual                   $ 1,000.00    $ 1,049.80    $  6.83
- ----------------------------------------------------------------------------
Class A Hypothetical               1,000.00      1,018.15       6.73
- ----------------------------------------------------------------------------
Class B Actual                     1,000.00      1,046.40      10.50
- ----------------------------------------------------------------------------
Class B Hypothetical               1,000.00      1,014.58      10.34
- ----------------------------------------------------------------------------
Class C Actual                     1,000.00      1,046.40      10.66
- ----------------------------------------------------------------------------
Class C Hypothetical               1,000.00      1,014.43      10.49
- ----------------------------------------------------------------------------
Class N Actual                     1,000.00      1,048.90       8.06
- ----------------------------------------------------------------------------
Class N Hypothetical               1,000.00      1,016.96       7.93
- ----------------------------------------------------------------------------
Class Y Actual                     1,000.00      1,052.50       4.64
- ----------------------------------------------------------------------------
Class Y Hypothetical               1,000.00      1,020.28       4.57

Hypothetical assumes 5% annual return before expenses.

Expenses are equal to the Fund's annualized expense ratio for that class,
multiplied by the average account value over the period, multiplied by 181/365
(to reflect the one-half year period). Those annualized expense ratios,
excluding indirect expenses from affiliated fund, based on the 6-month period
ended April 30, 2007 are as follows:

CLASS          EXPENSE RATIOS
- -----------------------------
Class A             1.34%
- -----------------------------
Class B             2.06
- -----------------------------
Class C             2.09
- -----------------------------
Class N             1.58
- -----------------------------
Class Y             0.91

The expense ratios reflect voluntary waivers or reimbursements of expenses by
the Fund's Manager and Transfer Agent that can be terminated at any time,
without advance notice. The "Financial Highlights" tables in the Fund's
financial statements, included in this report, also show the gross expense
ratios, without such waivers or reimbursements.

- --------------------------------------------------------------------------------


                          15 | OPPENHEIMER MIDCAP FUND



STATEMENT OF INVESTMENTS  April 30, 2007 / Unaudited
- --------------------------------------------------------------------------------

                                                                          VALUE
                                                         SHARES      SEE NOTE 1
- --------------------------------------------------------------------------------
COMMON STOCKS--97.1%
- --------------------------------------------------------------------------------
CONSUMER DISCRETIONARY--13.7%
- --------------------------------------------------------------------------------
DIVERSIFIED CONSUMER SERVICES--0.8%
ITT Educational
Services, Inc. 1                                         85,100   $   8,272,571
- --------------------------------------------------------------------------------
HOTELS, RESTAURANTS & LEISURE--1.6%
International Game
Technology                                              273,900      10,446,546
- --------------------------------------------------------------------------------
Panera Bread
Co., Cl. A 1                                            137,200       7,640,668
                                                                  --------------
                                                                     18,087,214

- --------------------------------------------------------------------------------
SPECIALTY RETAIL--7.9%
GameStop Corp.,
Cl. A 1                                                  98,700       3,273,879
- --------------------------------------------------------------------------------
O'Reilly
Automotive, Inc. 1                                      886,300      31,552,280
- --------------------------------------------------------------------------------
Tiffany & Co.                                           431,300      20,568,697
- --------------------------------------------------------------------------------
TJX Cos., Inc. (The)                                    516,500      14,405,185
- --------------------------------------------------------------------------------
Tractor Supply Co. 1                                    319,700      16,541,278
                                                                  --------------
                                                                     86,341,319

- --------------------------------------------------------------------------------
TEXTILES, APPAREL & LUXURY GOODS--3.4%
Coach, Inc. 1                                           246,166      12,020,286
- --------------------------------------------------------------------------------
Polo Ralph
Lauren Corp., Cl. A                                     270,400      24,906,544
                                                                  --------------
                                                                     36,926,830

- --------------------------------------------------------------------------------
ENERGY--4.7%
- --------------------------------------------------------------------------------
ENERGY EQUIPMENT & SERVICES--2.4%
Cameron
International Corp. 1                                   112,400       7,257,668
- --------------------------------------------------------------------------------
Dril-Quip, Inc. 1                                        65,400       3,302,700
- --------------------------------------------------------------------------------
Smith
International, Inc.                                     291,100      15,265,284
                                                                  --------------
                                                                     25,825,652

- --------------------------------------------------------------------------------
OIL & GAS--2.3%
Murphy Oil Corp.                                        247,800      13,738,032
- --------------------------------------------------------------------------------
XTO Energy, Inc.                                        216,566      11,753,037
                                                                  --------------
                                                                     25,491,069

                                                                          VALUE
                                                         SHARES      SEE NOTE 1
- --------------------------------------------------------------------------------
FINANCIALS--17.3%
- --------------------------------------------------------------------------------
CAPITAL MARKETS--5.0%
Affiliated Managers
Group, Inc. 1                                           169,100   $  19,891,233
- --------------------------------------------------------------------------------
Greenhill & Co., Inc.                                   174,300      11,024,475
- --------------------------------------------------------------------------------
Investors Financial
Services Corp.                                          298,100      18,446,428
- --------------------------------------------------------------------------------
Legg Mason, Inc.                                         57,500       5,703,425
                                                                  --------------
                                                                     55,065,561

- --------------------------------------------------------------------------------
COMMERCIAL BANKS--5.0%
Commerce
Bancorp, Inc.                                           587,500      19,646,000
- --------------------------------------------------------------------------------
East West
Bancorp, Inc.                                           311,300      12,408,418
- --------------------------------------------------------------------------------
Marshall
& Ilsley Corp.                                          457,900      21,988,358
                                                                  --------------
                                                                     54,042,776

- --------------------------------------------------------------------------------
DIVERSIFIED FINANCIAL SERVICES--1.0%
Chicago Mercantile
Exchange (The)                                           21,400      11,058,450
- --------------------------------------------------------------------------------
INSURANCE--3.8%
AMBAC Financial
Group, Inc.                                             207,300      19,030,140
- --------------------------------------------------------------------------------
Brown & Brown, Inc.                                     101,600       2,616,200
- --------------------------------------------------------------------------------
Philadelphia
Consolidated
Holding Co. 1                                           460,000      19,964,000
                                                                  --------------
                                                                     41,610,340

- --------------------------------------------------------------------------------
REAL ESTATE MANAGEMENT & DEVELOPMENT--2.5%
CB Richard Ellis
Group, Inc., Cl. A 1                                    463,200      15,679,320
- --------------------------------------------------------------------------------
Jones Lang
LaSalle, Inc.                                           107,500      11,555,175
                                                                  --------------
                                                                     27,234,495

- --------------------------------------------------------------------------------
HEALTH CARE--16.4%
- --------------------------------------------------------------------------------
BIOTECHNOLOGY--0.4%
Cephalon, Inc. 1                                         55,200       4,394,472
- --------------------------------------------------------------------------------
HEALTH CARE EQUIPMENT & SUPPLIES--7.2%
Bard (C.R.), Inc.                                       382,700      31,813,851


                          16 | OPPENHEIMER MIDCAP FUND



                                                                          VALUE
                                                         SHARES      SEE NOTE 1
- --------------------------------------------------------------------------------
HEALTH CARE EQUIPMENT & SUPPLIES Continued
IDEXX
Laboratories, Inc. 1                                    201,300   $  18,151,221
- --------------------------------------------------------------------------------
ResMed, Inc. 1                                          186,000       7,860,360
- --------------------------------------------------------------------------------
Varian Medical
Systems, Inc. 1                                         489,052      20,642,885
                                                                  --------------
                                                                     78,468,317

- --------------------------------------------------------------------------------
HEALTH CARE PROVIDERS & SERVICES--4.2%
Coventry Health
Care, Inc. 1                                            462,225      26,730,472
- --------------------------------------------------------------------------------
Laboratory Corp.
of America
Holdings 1                                               46,100       3,639,134
- --------------------------------------------------------------------------------
Schein (Henry), Inc. 1                                  228,000      11,885,640
- --------------------------------------------------------------------------------
WellCare Health
Plans, Inc. 1                                            49,400       3,981,146
                                                                  --------------
                                                                     46,236,392

- --------------------------------------------------------------------------------
HEALTH CARE TECHNOLOGY--2.0%
Cerner Corp. 1                                          403,900      21,503,636
- --------------------------------------------------------------------------------
LIFE SCIENCES TOOLS & SERVICES--2.6%
Covance, Inc. 1                                         427,300      25,851,650
- --------------------------------------------------------------------------------
Techne Corp. 1                                           46,200       2,724,414
                                                                  --------------
                                                                     28,576,064

- --------------------------------------------------------------------------------
INDUSTRIALS--13.9%
- --------------------------------------------------------------------------------
AEROSPACE & DEFENSE--2.6%
Rockwell Collins, Inc.                                  431,900      28,362,873
- --------------------------------------------------------------------------------
AIR FREIGHT & LOGISTICS--1.4%
C.H. Robinson
Worldwide, Inc.                                         159,600       8,532,216
- --------------------------------------------------------------------------------
Expeditors International
of Washington, Inc.                                     154,200       6,445,560
                                                                  --------------
                                                                     14,977,776

- --------------------------------------------------------------------------------
COMMERCIAL SERVICES & SUPPLIES--3.0%
Dun & Bradstreet
Corp.                                                    36,800       3,323,040
- --------------------------------------------------------------------------------
Stericycle, Inc. 1                                      334,300      29,130,902
                                                                  --------------
                                                                     32,453,942

                                                                          VALUE
                                                         SHARES      SEE NOTE 1
- --------------------------------------------------------------------------------
ELECTRICAL EQUIPMENT--1.1%
Rockwell
Automation, Inc.                                        204,300   $  12,164,022
- --------------------------------------------------------------------------------
MACHINERY--3.4%
Donaldson Co., Inc.                                     550,500      19,773,960
- --------------------------------------------------------------------------------
Joy Global, Inc.                                        344,900      17,462,287
                                                                  --------------
                                                                     37,236,247

- --------------------------------------------------------------------------------
TRADING COMPANIES & DISTRIBUTORS--2.4%
Fastenal Co.                                            634,500      26,090,640
- --------------------------------------------------------------------------------
INFORMATION TECHNOLOGY--25.5%
- --------------------------------------------------------------------------------
COMPUTERS & PERIPHERALS--0.3%
Network
Appliance, Inc. 1                                        92,400       3,438,204
- --------------------------------------------------------------------------------
ELECTRONIC EQUIPMENT & INSTRUMENTS--4.1%
Agilent
Technologies, Inc. 1                                    485,300      16,679,761
- --------------------------------------------------------------------------------
Amphenol
Corp., Cl. A                                             93,800       3,293,318
- --------------------------------------------------------------------------------
CDW Corp.                                               113,200       8,151,532
- --------------------------------------------------------------------------------
Trimble
Navigation Ltd. 1                                       593,100      17,010,108
                                                                  --------------
                                                                     45,134,719

- --------------------------------------------------------------------------------
INTERNET SOFTWARE & SERVICES--1.9%
Akamai
Technologies, Inc. 1                                     96,600       4,258,128
- --------------------------------------------------------------------------------
Digital River, Inc. 1                                   274,500      16,066,485
                                                                  --------------
                                                                     20,324,613

- --------------------------------------------------------------------------------
IT SERVICES--6.0%
Alliance Data
Systems Corp. 1                                         500,300      31,849,098
- --------------------------------------------------------------------------------
Cognizant Technology
Solutions Corp. 1                                       170,300      15,224,820
- --------------------------------------------------------------------------------
Fiserv, Inc. 1                                           60,900       3,238,053
- --------------------------------------------------------------------------------
VeriFone
Holdings, Inc. 1                                        440,600      15,548,774
                                                                  --------------
                                                                     65,860,745


                          17 | OPPENHEIMER MIDCAP FUND



STATEMENT OF INVESTMENTS  Unaudited / Continued
- --------------------------------------------------------------------------------

                                                                          VALUE
                                                         SHARES      SEE NOTE 1
- --------------------------------------------------------------------------------
SEMICONDUCTORS & SEMICONDUCTOR EQUIPMENT--4.0%
FormFactor, Inc. 1                                      306,900   $  12,671,901
- --------------------------------------------------------------------------------
Microchip
Technology, Inc.                                        769,800      31,053,732
                                                                  --------------
                                                                     43,725,633

- --------------------------------------------------------------------------------
SOFTWARE--9.2%
Adobe Systems, Inc. 1                                   456,100      18,955,516
- --------------------------------------------------------------------------------
Amdocs Ltd. 1                                           645,900      23,736,825
- --------------------------------------------------------------------------------
Ansys, Inc. 1                                            58,100       2,974,720
- --------------------------------------------------------------------------------
Autodesk, Inc. 1                                        133,100       5,493,037
- --------------------------------------------------------------------------------
Citrix Systems, Inc. 1                                  437,300      14,255,980
- --------------------------------------------------------------------------------
FactSet Research
Systems, Inc.                                           384,150      23,629,067
- --------------------------------------------------------------------------------
Intuit, Inc. 1                                          381,100      10,842,295
                                                                  --------------
                                                                     99,887,440

- --------------------------------------------------------------------------------
MATERIALS--3.6%
- --------------------------------------------------------------------------------
CHEMICALS--2.6%
Ecolab, Inc.                                            578,400      24,865,416
- --------------------------------------------------------------------------------
Sigma-Aldrich Corp.                                      78,900       3,320,112
                                                                  --------------
                                                                     28,185,528

- --------------------------------------------------------------------------------
CONSTRUCTION MATERIALS--0.3%
Vulcan Materials Co.                                     27,900       3,450,393

                                                                          VALUE
                                                        SHARES       SEE NOTE 1
- --------------------------------------------------------------------------------
METALS & MINING--0.7%
Allegheny
Technologies, Inc.                                      38,800   $    4,251,704
- --------------------------------------------------------------------------------
Titanium
Metals Corp. 1                                         109,300        3,774,129
                                                                 ---------------
                                                                      8,025,833

- --------------------------------------------------------------------------------
TELECOMMUNICATION SERVICES--1.7%
- --------------------------------------------------------------------------------
DIVERSIFIED TELECOMMUNICATION SERVICES--0.7%
NeuStar, Inc., Cl. A 1                                 289,500        8,326,020
- --------------------------------------------------------------------------------
WIRELESS TELECOMMUNICATION SERVICES--1.0%
NII Holdings, Inc. 1                                   138,300       10,614,525
- --------------------------------------------------------------------------------
UTILITIES--0.3%
- --------------------------------------------------------------------------------
GAS UTILITIES--0.3%
Questar Corp.                                           33,800        3,282,993
                                                                 ---------------
Total Common Stocks
(Cost $864,133,756)                                               1,060,677,304

- --------------------------------------------------------------------------------
INVESTMENTS IN AFFILIATED COMPANIES--2.5%

Oppenheimer Institutional Money
Market Fund, Cl. E,
5.21% 2,3
(Cost $26,852,866)                                  26,852,866       26,852,866

- --------------------------------------------------------------------------------
TOTAL INVESTMENTS,
AT VALUE
(COST $890,986,622)                                       99.6%   1,087,530,170
- --------------------------------------------------------------------------------
OTHER ASSETS
NET OF LIABILITIES                                         0.4        4,380,042
                                                    ----------------------------
NET ASSETS                                               100.0%  $1,091,910,212
                                                    ============================

FOOTNOTES TO STATEMENT OF INVESTMENTS

1. Non-income producing security.

2. Rate shown is the 7-day yield as of April 30, 2007.

3. Is or was an affiliate, as defined in the Investment Company Act of 1940, at
or during the period ended April 30, 2007, by virtue of the Fund owning at least
5% of the voting securities of the issuer or as a result of the Fund and the
issuer having the same investment advisor. Transactions during the period in
which the issuer was an affiliate are as follows:



                                       SHARES                                      SHARES
                                  OCTOBER 31,          GROSS          GROSS     APRIL 30,
                                         2006      ADDITIONS     REDUCTIONS          2007
- ------------------------------------------------------------------------------------------
                                                                   
Oppenheimer Institutional
Money Market Fund, Cl. E, 5.21%    15,374,147    145,915,562    134,436,843    26,852,866




                                                                      VALUE      DIVIDEND
                                                                 SEE NOTE 1        INCOME
- ------------------------------------------------------------------------------------------
                                                                           
Oppenheimer Institutional
Money Market Fund, Cl. E, 5.21%                                 $26,852,866      $381,872


SEE ACCOMPANYING NOTES TO FINANCIAL STATEMENTS.


                          18 | OPPENHEIMER MIDCAP FUND



STATEMENT OF ASSETS AND LIABILITIES  Unaudited
- --------------------------------------------------------------------------------



April 30, 2007
- -------------------------------------------------------------------------------------
                                                                 
ASSETS
- -------------------------------------------------------------------------------------
Investments, at value--see accompanying statement of investments:
Unaffiliated companies (cost $864,133,756)                          $  1,060,677,304
Affiliated companies (cost $26,852,866)                                   26,852,866
                                                                    -----------------
                                                                       1,087,530,170
- -------------------------------------------------------------------------------------
Cash                                                                         555,509
- -------------------------------------------------------------------------------------
Receivables and other assets:
Investments sold                                                          90,127,250
Shares of beneficial interest sold                                           394,226
Interest and dividends                                                       205,680
Other                                                                         20,722
                                                                    -----------------
Total assets                                                           1,178,833,557

- -------------------------------------------------------------------------------------
LIABILITIES
- -------------------------------------------------------------------------------------
Payables and other liabilities:
Investments purchased                                                     83,613,295
Shares of beneficial interest redeemed                                     2,382,962
Transfer and shareholder servicing agent fees                                332,357
Distribution and service plan fees                                           212,406
Shareholder communications                                                   197,572
Trustees' compensation                                                       160,586
Other                                                                         24,167
                                                                    -----------------
Total liabilities                                                         86,923,345

- -------------------------------------------------------------------------------------
NET ASSETS                                                          $  1,091,910,212
                                                                    =================

- -------------------------------------------------------------------------------------
COMPOSITION OF NET ASSETS
- -------------------------------------------------------------------------------------
Paid-in capital                                                     $  1,767,283,464
- -------------------------------------------------------------------------------------
Accumulated net investment loss                                           (5,576,703)
- -------------------------------------------------------------------------------------
Accumulated net realized loss on investments                            (866,340,097)
- -------------------------------------------------------------------------------------
Net unrealized appreciation on investments                               196,543,548
                                                                    -----------------
NET ASSETS                                                          $  1,091,910,212
                                                                    =================



                          19 | OPPENHEIMER MIDCAP FUND



STATEMENT OF ASSETS AND LIABILITIES  Unaudited / Continued
- --------------------------------------------------------------------------------


                                                                                               
- ----------------------------------------------------------------------------------------------------------
NET ASSET VALUE PER SHARE
- ----------------------------------------------------------------------------------------------------------
Class A Shares:
Net asset value and redemption price per share (based on net assets of $687,694,944 and
35,081,416 shares of beneficial interest outstanding)                                             $ 19.60
Maximum offering price per share (net asset value plus sales charge of 5.75% of offering price)   $ 20.80
- ----------------------------------------------------------------------------------------------------------
Class B Shares:
Net asset value, redemption price (excludes applicable contingent deferred sales charge)
and offering price per share (based on net assets of $195,205,948 and 10,678,787 shares
of beneficial interest outstanding)                                                               $ 18.28
- ----------------------------------------------------------------------------------------------------------
Class C Shares:
Net asset value, redemption price (excludes applicable contingent deferred sales charge)
and offering price per share (based on net assets of $134,443,070 and 7,355,233 shares
of beneficial interest outstanding)                                                               $ 18.28
- ----------------------------------------------------------------------------------------------------------
Class N Shares:
Net asset value, redemption price (excludes applicable contingent deferred sales charge)
and offering price per share (based on net assets of $38,122,373 and 1,973,878 shares
of beneficial interest outstanding)                                                               $ 19.31
- ----------------------------------------------------------------------------------------------------------
Class Y Shares:
Net asset value, redemption price and offering price per share (based on net assets
of $36,443,877 and 1,782,796 shares of beneficial interest outstanding)                           $ 20.44


SEE ACCOMPANYING NOTES TO FINANCIAL STATEMENTS.


                          20 | OPPENHEIMER MIDCAP FUND



STATEMENT OF OPERATIONS  Unaudited
- --------------------------------------------------------------------------------

For the Six Months Ended April 30, 2007
- --------------------------------------------------------------------------------
INVESTMENT INCOME
- --------------------------------------------------------------------------------
Dividends:
Unaffiliated companies                                           $   2,824,163
Affiliated companies                                                   381,872
- --------------------------------------------------------------------------------
Interest                                                                39,463
                                                                 ---------------
Total investment income                                              3,245,498

- --------------------------------------------------------------------------------
EXPENSES

Management fees                                                      3,739,682
- --------------------------------------------------------------------------------
Distribution and service plan fees:
Class A                                                                832,353
Class B                                                              1,058,975
Class C                                                                688,368
Class N                                                                 94,569
- --------------------------------------------------------------------------------
Transfer and shareholder servicing agent fees:
Class A                                                              1,362,822
Class B                                                                326,909
Class C                                                                262,674
Class N                                                                 81,545
Class Y                                                                 41,645
- --------------------------------------------------------------------------------
Shareholder communications:
Class A                                                                145,702
Class B                                                                 75,106
Class C                                                                 25,602
Class N                                                                  2,958
Class Y                                                                     30
- --------------------------------------------------------------------------------
Trustees' compensation                                                  29,309
- --------------------------------------------------------------------------------
Custodian fees and expenses                                              2,907
- --------------------------------------------------------------------------------
Administration service fees                                                750
- --------------------------------------------------------------------------------
Other                                                                   89,550
                                                                 ---------------
Total expenses                                                       8,861,456
Less waivers and reimbursements of expenses                           (193,479)
                                                                 ---------------
Net expenses                                                         8,667,977

- --------------------------------------------------------------------------------
NET INVESTMENT LOSS                                                 (5,422,479)

- --------------------------------------------------------------------------------
REALIZED AND UNREALIZED GAIN (LOSS)

Net realized gain on investments                                   100,551,997
- --------------------------------------------------------------------------------
Net change in unrealized appreciation on investments               (41,630,156)

- --------------------------------------------------------------------------------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS             $  53,499,362
                                                                 ===============

SEE ACCOMPANYING NOTES TO FINANCIAL STATEMENTS.


                          21 | OPPENHEIMER MIDCAP FUND



STATEMENTS OF CHANGES IN NET ASSETS
- --------------------------------------------------------------------------------



                                                                              SIX MONTHS              YEAR
                                                                                   ENDED             ENDED
                                                                          APRIL 30, 2007       OCTOBER 31,
                                                                              (UNAUDITED)             2006
- ------------------------------------------------------------------------------------------------------------
                                                                                     
OPERATIONS

Net investment loss                                                      $    (5,422,479)  $   (10,976,062)
- ------------------------------------------------------------------------------------------------------------
Net realized gain                                                            100,551,997        98,157,780
- ------------------------------------------------------------------------------------------------------------
Net change in unrealized appreciation                                        (41,630,156)      (20,813,201)
                                                                         -----------------------------------
Net increase in net assets resulting from operations                          53,499,362        66,368,517

- ------------------------------------------------------------------------------------------------------------
BENEFICIAL INTEREST TRANSACTIONS

Net increase (decrease) in net assets resulting from
beneficial interest transactions:
Class A                                                                      (33,904,742)       32,109,669
Class B                                                                      (50,164,463)      (92,141,117)
Class C                                                                      (16,054,643)         (296,334)
Class N                                                                       (2,157,528)        1,542,223
Class Y                                                                       (3,932,378)         (536,366)
                                                                         -----------------------------------
                                                                            (106,213,754)      (59,321,925)

- ------------------------------------------------------------------------------------------------------------
NET ASSETS

Total increase (decrease)                                                    (52,714,392)        7,046,592
- ------------------------------------------------------------------------------------------------------------
Beginning of period                                                        1,144,624,604     1,137,578,012
                                                                         -----------------------------------

End of period (including accumulated net investment loss of $5,576,703
and $154,224, respectively)                                              $ 1,091,910,212   $ 1,144,624,604
                                                                         ===================================


SEE ACCOMPANYING NOTES TO FINANCIAL STATEMENTS.


                          22 | OPPENHEIMER MIDCAP FUND



FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------



                                               SIX MONTHS                                                                    YEAR
                                                    ENDED                                                                   ENDED
                                           APRIL 30, 2007                                                                OCT. 31,
CLASS A                                       (UNAUDITED)           2006           2005           2004          2003         2002
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                                      
PER SHARE OPERATING DATA
- -----------------------------------------------------------------------------------------------------------------------------------
Net asset value, beginning of period           $    18.67     $    17.56     $    15.04     $    13.97    $    11.43    $   14.42
- -----------------------------------------------------------------------------------------------------------------------------------
Income (loss) from investment operations:
Net investment loss                                  (.07) 1        (.12) 1        (.15) 1        (.17)         (.12)        (.13)
Net realized and unrealized gain (loss)              1.00           1.23           2.67           1.24          2.66        (2.86)
                                               ------------------------------------------------------------------------------------
Total from investment operations                      .93           1.11           2.52           1.07          2.54        (2.99)
- -----------------------------------------------------------------------------------------------------------------------------------

Net asset value, end of period                 $    19.60     $    18.67     $    17.56     $    15.04    $    13.97    $   11.43
                                               ====================================================================================

- -----------------------------------------------------------------------------------------------------------------------------------
TOTAL RETURN, AT NET ASSET VALUE 2                   4.98%          6.32%         16.76%          7.66%        22.22%      (20.74)%
- -----------------------------------------------------------------------------------------------------------------------------------

- -----------------------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL DATA
- -----------------------------------------------------------------------------------------------------------------------------------
Net assets, end of period (in thousands)       $  687,695     $  687,642     $  618,270     $  504,292    $  430,514    $ 351,983
- -----------------------------------------------------------------------------------------------------------------------------------
Average net assets (in thousands)              $  689,004     $  696,033     $  570,513     $  457,926    $  366,050    $ 460,797
- -----------------------------------------------------------------------------------------------------------------------------------
Ratios to average net assets: 3
Net investment loss                                 (0.76)%        (0.65)%        (0.94)%        (1.05)%       (1.01)%      (1.06)%
Total expenses                                       1.39% 4        1.32% 4        1.39%          1.42%         1.61%        1.68%
Expenses after payments, waivers and/or
reimbursements and reductions
to custodian expenses                                1.34%          1.30%          1.35%          1.33%         1.32%        1.47%
- -----------------------------------------------------------------------------------------------------------------------------------
Portfolio turnover rate                                24%            63%            39%           114%           76%          51%


1. Per share amounts calculated based on the average shares outstanding during
the period.

2. Assumes an investment on the business day before the first day of the fiscal
period, with all dividends and distributions reinvested in additional shares on
the reinvestment date, and redemption at the net asset value calculated on the
last business day of the fiscal period. Sales charges are not reflected in the
total returns. Total returns are not annualized for periods of less than one
full year. Returns do not reflect the deduction of taxes that a shareholder
would pay on fund distributions or the redemption of fund shares.

3. Annualized for periods of less than one full year.

4. Expenses including indirect expenses from affiliated fund were as follows:

      Six Months Ended April 30, 2007     1.39%
      Year Ended October 31, 2006         1.32

SEE ACCOMPANYING NOTES TO FINANCIAL STATEMENTS.


                          23 | OPPENHEIMER MIDCAP FUND



FINANCIAL HIGHLIGHTS  Continued
- --------------------------------------------------------------------------------



                                               SIX MONTHS                                                                    YEAR
                                                    ENDED                                                                   ENDED
                                           APRIL 30, 2007                                                                OCT. 31,
CLASS B                                       (UNAUDITED)           2006           2005           2004          2003         2002
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                                      
PER SHARE OPERATING DATA
- -----------------------------------------------------------------------------------------------------------------------------------
Net asset value, beginning of period           $    17.47     $    16.56     $    14.29     $    13.37    $    11.02    $   14.02
- -----------------------------------------------------------------------------------------------------------------------------------
Income (loss) from investment operations:
Net investment loss                                  (.13) 1        (.25) 1        (.27) 1        (.30)         (.23)        (.30)
Net realized and unrealized gain (loss)               .94           1.16           2.54           1.22          2.58        (2.70)
                                               ------------------------------------------------------------------------------------
Total from investment operations                      .81            .91           2.27            .92          2.35        (3.00)
- -----------------------------------------------------------------------------------------------------------------------------------

Net asset value, end of period                 $    18.28     $    17.47     $    16.56     $    14.29    $    13.37    $   11.02
                                               ====================================================================================

- -----------------------------------------------------------------------------------------------------------------------------------
TOTAL RETURN, AT NET ASSET VALUE 2                   4.64%          5.49%         15.89%          6.88%        21.33%      (21.40)%
- -----------------------------------------------------------------------------------------------------------------------------------

- -----------------------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL DATA
- -----------------------------------------------------------------------------------------------------------------------------------
Net assets, end of period (in thousands)       $  195,206     $  235,821     $  310,352     $  312,315    $  327,880    $ 291,397
- -----------------------------------------------------------------------------------------------------------------------------------
Average net assets (in thousands)              $  213,604     $  283,459     $  319,953     $  316,748    $  291,209    $ 385,917
- -----------------------------------------------------------------------------------------------------------------------------------
Ratios to average net assets: 3
Net investment loss                                 (1.47)%        (1.40)%        (1.71)%        (1.83)%       (1.75)%      (1.85)%
Total expenses                                       2.07% 4        2.08% 4        2.26%          2.30%         2.51%        2.48%
Expenses after payments, waivers and/or
reimbursements and reductions
to custodian expenses                                2.06%          2.07%          2.14%          2.12%         2.06%        2.27%
- -----------------------------------------------------------------------------------------------------------------------------------
Portfolio turnover rate                                24%            63%            39%           114%           76%          51%


1. Per share amounts calculated based on the average shares outstanding during
the period.

2. Assumes an investment on the business day before the first day of the fiscal
period, with all dividends and distributions reinvested in additional shares on
the reinvestment date, and redemption at the net asset value calculated on the
last business day of the fiscal period. Sales charges are not reflected in the
total returns. Total returns are not annualized for periods of less than one
full year. Returns do not reflect the deduction of taxes that a shareholder
would pay on fund distributions or the redemption of fund shares.

3. Annualized for periods of less than one full year.

4. Expenses including indirect expenses from affiliated fund were as follows:

      Six Months Ended April 30, 2007     2.07%
      Year Ended October 31, 2006         2.08

SEE ACCOMPANYING NOTES TO FINANCIAL STATEMENTS.


                          24 | OPPENHEIMER MIDCAP FUND





                                               SIX MONTHS                                                                    YEAR
                                                    ENDED                                                                   ENDED
                                           APRIL 30, 2007                                                                OCT. 31,
CLASS C                                       (UNAUDITED)           2006           2005           2004          2003         2002
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                                      
PER SHARE OPERATING DATA
- -----------------------------------------------------------------------------------------------------------------------------------
Net asset value, beginning of period           $    17.47     $    16.56     $    14.29     $    13.37    $    11.02    $   14.02
- -----------------------------------------------------------------------------------------------------------------------------------
Income (loss) from investment operations:
Net investment loss                                  (.13) 1        (.24) 1        (.26) 1        (.25)         (.20)        (.30)
Net realized and unrealized gain (loss)               .94           1.15           2.53           1.17          2.55        (2.70)
                                               ------------------------------------------------------------------------------------
Total from investment operations                      .81            .91           2.27            .92          2.35        (3.00)
- -----------------------------------------------------------------------------------------------------------------------------------

Net asset value, end of period                 $    18.28     $    17.47     $    16.56     $    14.29    $    13.37    $   11.02
                                               ====================================================================================

- -----------------------------------------------------------------------------------------------------------------------------------
TOTAL RETURN, AT NET ASSET VALUE 2                   4.64%          5.49%         15.89%          6.88%        21.33%      (21.40)%
- -----------------------------------------------------------------------------------------------------------------------------------

- -----------------------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL DATA
- -----------------------------------------------------------------------------------------------------------------------------------
Net assets, end of period (in thousands)       $  134,443     $  144,184     $  137,308     $  110,018    $  103,271    $  83,351
- -----------------------------------------------------------------------------------------------------------------------------------
Average net assets (in thousands)              $  138,955     $  149,438     $  126,925     $  105,285    $   87,528    $ 112,436
- -----------------------------------------------------------------------------------------------------------------------------------
Ratios to average net assets: 3
Net investment loss                                 (1.50)%        (1.39)%        (1.68)%        (1.81)%       (1.77)%      (1.84)%
Total expenses                                       2.11% 4        2.06% 4        2.17%          2.26%         2.49%        2.47%
Expenses after payments, waivers and/or
reimbursements and reductions
to custodian expenses                                2.09%          2.04%          2.10%          2.10%         2.08%        2.26%
- -----------------------------------------------------------------------------------------------------------------------------------
Portfolio turnover rate                                24%            63%            39%           114%           76%          51%


1. Per share amounts calculated based on the average shares outstanding during
the period.

2. Assumes an investment on the business day before the first day of the fiscal
period, with all dividends and distributions reinvested in additional shares on
the reinvestment date, and redemption at the net asset value calculated on the
last business day of the fiscal period. Sales charges are not reflected in the
total returns. Total returns are not annualized for periods of less than one
full year. Returns do not reflect the deduction of taxes that a shareholder
would pay on fund distributions or the redemption of fund shares.

3. Annualized for periods of less than one full year.

4. Expenses including indirect expenses from affiliated fund were as follows:

      Six Months Ended April 30, 2007     2.11%
      Year Ended October 31, 2006         2.06

SEE ACCOMPANYING NOTES TO FINANCIAL STATEMENTS.


                          25 | OPPENHEIMER MIDCAP FUND



FINANCIAL HIGHLIGHTS  Continued
- --------------------------------------------------------------------------------



                                               SIX MONTHS                                                                    YEAR
                                                    ENDED                                                                   ENDED
                                           APRIL 30, 2007                                                                OCT. 31,
CLASS N                                       (UNAUDITED)           2006           2005           2004          2003         2002
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                                      
PER SHARE OPERATING DATA
- -----------------------------------------------------------------------------------------------------------------------------------
Net asset value, beginning of period           $    18.41     $    17.36     $    14.90     $    13.87    $    11.38    $   14.40
- -----------------------------------------------------------------------------------------------------------------------------------
Income (loss) from investment operations:
Net investment loss                                  (.09) 1        (.16) 1        (.19) 1        (.18)         (.17)        (.14)
Net realized and unrealized gain (loss)               .99           1.21           2.65           1.21          2.66        (2.88)
                                               ------------------------------------------------------------------------------------
Total from investment operations                      .90           1.05           2.46           1.03          2.49        (3.02)
- -----------------------------------------------------------------------------------------------------------------------------------

Net asset value, end of period                 $    19.31     $    18.41     $    17.36     $    14.90    $    13.87    $   11.38
                                               ====================================================================================

- -----------------------------------------------------------------------------------------------------------------------------------
TOTAL RETURN, AT NET ASSET VALUE 2                   4.89%          6.05%         16.51%          7.43%        21.88%      (20.97)%
- -----------------------------------------------------------------------------------------------------------------------------------

- -----------------------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL DATA
- -----------------------------------------------------------------------------------------------------------------------------------
Net assets, end of period (in thousands)       $   38,122     $   38,500     $   34,879     $   22,488    $   16,606    $   8,846
- -----------------------------------------------------------------------------------------------------------------------------------
Average net assets (in thousands)              $   38,193     $   38,644     $   29,445     $   18,969    $   11,846    $   6,576
- -----------------------------------------------------------------------------------------------------------------------------------
Ratios to average net assets: 3
Net investment loss                                 (0.99)%        (0.89)%        (1.15)%        (1.28)%       (1.34)%      (1.28)%
Total expenses                                       1.66% 4        1.60% 4        1.67%          1.80%         1.86%        1.87%
Expenses after payments, waivers and/or
reimbursements and reductions
to custodian expenses                                1.58%          1.53%          1.55%          1.57%         1.64%        1.66%
- -----------------------------------------------------------------------------------------------------------------------------------
Portfolio turnover rate                                24%            63%            39%           114%           76%          51%


1. Per share amounts calculated based on the average shares outstanding during
the period.

2. Assumes an investment on the business day before the first day of the fiscal
period, with all dividends and distributions reinvested in additional shares on
the reinvestment date, and redemption at the net asset value calculated on the
last business day of the fiscal period. Sales charges are not reflected in the
total returns. Total returns are not annualized for periods of less than one
full year. Returns do not reflect the deduction of taxes that a shareholder
would pay on fund distributions or the redemption of fund shares.

3. Annualized for periods of less than one full year.

4. Expenses including indirect expenses from affiliated fund were as follows:

      Six Months Ended April 30, 2007     1.66%
      Year Ended October 31, 2006         1.60

SEE ACCOMPANYING NOTES TO FINANCIAL STATEMENTS.


                          26 | OPPENHEIMER MIDCAP FUND





                                             SIX MONTHS                                                                      YEAR
                                                  ENDED                                                                     ENDED
                                         APRIL 30, 2007                                                                  OCT. 31,
CLASS Y                                     (UNAUDITED)              2006            2005         2004         2003          2002
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                       
PER SHARE OPERATING DATA
- ------------------------------------------------------------------------------------------------------------------------------------
Net asset value, beginning of period          $   19.42         $   18.19       $   15.51    $   14.35    $   11.71      $  14.69
- ------------------------------------------------------------------------------------------------------------------------------------
Income (loss) from investment
operations:
Net investment loss                                (.03) 1           (.04) 1         (.08) 1      (.13)        (.19)         (.08)
Net realized and unrealized gain (loss)            1.05              1.27            2.76         1.29         2.83         (2.90)
                                              --------------------------------------------------------------------------------------
Total from investment operations                   1.02              1.23            2.68         1.16         2.64         (2.98)
- ------------------------------------------------------------------------------------------------------------------------------------

Net asset value, end of period                $   20.44         $   19.42       $   18.19    $   15.51    $   14.35      $  11.71
                                              ======================================================================================

- ------------------------------------------------------------------------------------------------------------------------------------
TOTAL RETURN, AT NET ASSET VALUE 2                 5.25%             6.76%          17.28%        8.08%       22.55%       (20.29)%
- ------------------------------------------------------------------------------------------------------------------------------------

- ------------------------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL DATA
- ------------------------------------------------------------------------------------------------------------------------------------
Net assets, end of period (in thousands)      $  36,444         $  38,478       $  36,769    $  23,785    $  17,171      $  7,419
- ------------------------------------------------------------------------------------------------------------------------------------
Average net assets (in thousands)             $  36,843         $  42,277       $  31,030    $  19,540    $  11,928      $  6,449
- ------------------------------------------------------------------------------------------------------------------------------------
Ratios to average net assets: 3
Net investment loss                               (0.33)%           (0.21)%         (0.49)%      (0.69)%      (0.80)%       (0.39)%
Total expenses                                     0.91% 4,5,6       0.86% 4,5       0.89% 7      0.98% 7      1.11% 6,7     0.83% 7
- ------------------------------------------------------------------------------------------------------------------------------------
Portfolio turnover rate                              24%               63%             39%         114%          76%           51%


1. Per share amounts calculated based on the average shares outstanding during
the period.

2. Assumes an investment on the business day before the first day of the fiscal
period, with all dividends and distributions reinvested in additional shares on
the reinvestment date, and redemption at the net asset value calculated on the
last business day of the fiscal period. Sales charges are not reflected in the
total returns. Total returns are not annualized for periods of less than one
full year. Returns do not reflect the deduction of taxes that a shareholder
would pay on fund distributions or the redemption of fund shares.

3. Annualized for periods of less than one full year.

4. Expenses including indirect expenses from affiliated fund were as follows:

      Six Months Ended April 30, 2007     0.91%
      Year Ended October 31, 2006         0.86

5. Voluntary waiver or reimbursement of indirect management fees less than
0.005%.

6. Voluntary waiver of transfer agent fees less than 0.005%.

7. Reduction to custodian expenses less than 0.005%.

SEE ACCOMPANYING NOTES TO FINANCIAL STATEMENTS.


                          27 | OPPENHEIMER MIDCAP FUND



NOTES TO FINANCIAL STATEMENTS  Unaudited
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
1. SIGNIFICANT ACCOUNTING POLICIES

Oppenheimer MidCap Fund (the Fund) is registered under the Investment Company
Act of 1940, as amended, as an open-end management investment company. The
Fund's investment objective is to seek capital appreciation. The Fund's
investment advisor is OppenheimerFunds, Inc. (the Manager).

      The Fund offers Class A, Class B, Class C, Class N and Class Y shares.
Class A shares are sold at their offering price, which is normally net asset
value plus a front-end sales charge. Class B, Class C and Class N shares are
sold without a front-end sales charge but may be subject to a contingent
deferred sales charge (CDSC). Class N shares are sold only through retirement
plans. Retirement plans that offer Class N shares may impose charges on those
accounts. Class Y shares are sold to certain institutional investors without
either a front-end sales charge or a CDSC, however, the institutional investor
may impose charges on those accounts. All classes of shares have identical
rights and voting privileges with respect to the Fund in general and exclusive
voting rights on matters that affect that class alone. Earnings, net assets and
net asset value per share may differ due to each class having its own expenses,
such as transfer and shareholder servicing agent fees and shareholder
communications, directly attributable to that class. Class A, B, C and N have
separate distribution and/or service plans. No such plan has been adopted for
Class Y shares. Class B shares will automatically convert to Class A shares six
years after the date of purchase.

      The following is a summary of significant accounting policies consistently
followed by the Fund.

- --------------------------------------------------------------------------------
SECURITIES VALUATION. The Fund calculates the net asset value of its shares as
of the close of the New York Stock Exchange (the "Exchange"), normally 4:00 P.M.
Eastern time, on each day the Exchange is open for business. Securities may be
valued primarily using dealer-supplied valuations or a portfolio pricing service
authorized by the Board of Trustees. Securities listed or traded on National
Stock Exchanges or other domestic exchanges are valued based on the last sale
price of the security traded on that exchange prior to the time when the Fund's
assets are valued. Securities traded on NASDAQ(R) are valued based on the
closing price provided by NASDAQ prior to the time when the Fund's assets are
valued. In the absence of a sale, the security is valued at the last sale price
on the prior trading day, if it is within the spread of the closing "bid" and
"asked" prices, and if not, at the closing bid price. Securities traded on
foreign exchanges are valued based on the last sale price on the principal
exchange on which the security is traded, as identified by the portfolio pricing
service, prior to the time when the Fund's assets are valued. In the absence of
a sale, the security is valued at the official closing price on the principal
exchange. Corporate, government and municipal debt instruments having a
remaining maturity in excess of sixty days and all mortgage-backed securities
will be valued at the mean between the "bid" and "asked" prices. Futures
contracts traded on a commodities or futures exchange will be valued at the
final settlement price or official closing price on the principal exchange as
reported by such principal exchange at its


                          28 | OPPENHEIMER MIDCAP FUND



trading session ending at, or most recently prior to, the time when the Fund's
assets are valued. Options are valued daily based upon the last sale price on
the principal exchange on which the option is traded. Securities (including
restricted securities) for which market quotations are not readily available are
valued at their fair value. Foreign and domestic securities whose values have
been materially affected by what the Manager identifies as a significant event
occurring before the Fund's assets are valued but after the close of their
respective exchanges will be fair valued. Fair value is determined in good faith
using consistently applied procedures under the supervision of the Board of
Trustees. Investments in open-end registered investment companies (including
affiliated funds) are valued at that fund's net asset value. Short-term "money
market type" debt securities with remaining maturities of sixty days or less are
valued at amortized cost (which approximates market value).

- --------------------------------------------------------------------------------
INVESTMENT IN OPPENHEIMER INSTITUTIONAL MONEY MARKET FUND. The Fund is permitted
to invest daily available cash balances in an affiliated money market fund. The
Fund may invest the available cash in Class E shares of Oppenheimer
Institutional Money Market Fund ("IMMF") which seeks current income and
stability of principal. IMMF is a registered open-end management investment
company, regulated as a money market fund under the Investment Company Act of
1940, as amended. The Manager is also the investment advisor of IMMF. The Fund's
investment in IMMF is included in the Statement of Investments. As a
shareholder, the Fund is subject to its proportional share of IMMF's Class E
expenses, including its management fee. The Manager will waive fees and/or
reimburse Fund expenses in an amount equal to the indirect management fees
incurred through the Fund's investment in IMMF.

- --------------------------------------------------------------------------------
ALLOCATION OF INCOME, EXPENSES, GAINS AND LOSSES. Income, expenses (other than
those attributable to a specific class), gains and losses are allocated on a
daily basis to each class of shares based upon the relative proportion of net
assets represented by such class. Operating expenses directly attributable to a
specific class are charged against the operations of that class.

- --------------------------------------------------------------------------------
FEDERAL TAXES. The Fund intends to comply with provisions of the Internal
Revenue Code applicable to regulated investment companies and to distribute
substantially all of its investment company taxable income, including any net
realized gain on investments not offset by capital loss carryforwards, if any,
to shareholders, therefore, no federal income or excise tax provision is
required.

      Net investment income (loss) and net realized gain (loss) may differ for
financial statement and tax purposes. The character of dividends and
distributions made during the fiscal year from net investment income or net
realized gains may differ from their ultimate characterization for federal
income tax purposes. Also, due to timing of dividends and distributions, the
fiscal year in which amounts are distributed may differ from the fiscal year in
which the income or net realized gain was recorded by the Fund.


                          29 | OPPENHEIMER MIDCAP FUND



NOTES TO FINANCIAL STATEMENTS  Unaudited / Continued
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
1. SIGNIFICANT ACCOUNTING POLICIES Continued

      As of April 30, 2007, the Fund had available for federal income tax
purposes an estimated capital loss carryforward of $866,283,871 expiring by
2015. This estimated capital loss carryforward represents carryforward as of the
end of the last fiscal year, increased for losses deferred under tax accounting
rules to the current fiscal year and is increased or decreased by capital losses
or gains realized in the first six months of the current fiscal year. As of
April 30, 2007, it is estimated that the Fund will utilize $100,551,997 of
capital loss carryforward to offset realized capital gains. During the fiscal
year ended October 31, 2006, the Fund utilized $98,062,815 of capital loss
carryforward to offset capital gains realized in that fiscal year. a

A. Includes $260,660 of capital loss carryforwards acquired in the September 4,
2003 merger of Oppenheimer Select Managers-Gartmore Millennium Growth Fund II.

As of October 31, 2006, the Fund had available for federal income tax purposes
unused capital loss carryforwards as follows:

                         EXPIRING
                         ------------------------------
                         2009              $661,307,473
                         2010               237,892,098
                         2011                67,636,297
                                           ------------
                         Total             $966,835,868
                                           ============

- --------------------------------------------------------------------------------
TRUSTEES' COMPENSATION. The Fund has adopted an unfunded retirement plan for the
Fund's independent trustees. Benefits are based on years of service and fees
paid to each trustee during the years of service. During the six months ended
April 30, 2007, the Fund's projected benefit obligations were increased by
$15,121 and payments of $6,859 were made to retired trustees, resulting in an
accumulated liability of $153,013 as of April 30, 2007.

      The Board of Trustees has adopted a compensation deferral plan for
independent trustees that enables trustees to elect to defer receipt of all or a
portion of the annual compensation they are entitled to receive from the Fund.
For purposes of determining the amount owed to the Trustee under the plan,
deferred amounts are treated as though equal dollar amounts had been invested in
shares of the Fund or in other Oppenheimer funds selected by the Trustee. The
Fund purchases shares of the funds selected for deferral by the Trustee in
amounts equal to his or her deemed investment, resulting in a Fund asset equal
to the deferred compensation liability. Such assets are included as a component
of "Other" within the asset section of the Statement of Assets and Liabilities.
Deferral of trustees' fees under the plan will not affect the net assets of the
Fund, and will not materially affect the Fund's assets, liabilities or net
investment income per share. Amounts will be deferred until distributed in
accordance to the compensation deferral plan.


                          30 | OPPENHEIMER MIDCAP FUND



- --------------------------------------------------------------------------------
DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS. Dividends and distributions to
shareholders, which are determined in accordance with income tax regulations,
are recorded on the ex-dividend date. Income and capital gain distributions, if
any, are declared and paid annually.

- --------------------------------------------------------------------------------
INVESTMENT INCOME. Dividend income is recorded on the ex-dividend date or upon
ex-dividend notification in the case of certain foreign dividends where the
ex-dividend date may have passed. Non-cash dividends included in dividend
income, if any, are recorded at the fair market value of the securities
received. Interest income, which includes accretion of discount and amortization
of premium, is accrued as earned.

- --------------------------------------------------------------------------------
CUSTODIAN FEES. "Custodian fees and expenses" in the Statement of Operations may
include interest expense incurred by the Fund on any cash overdrafts of its
custodian account during the period. Such cash overdrafts may result from the
effects of failed trades in portfolio securities and from cash outflows
resulting from unanticipated shareholder redemption activity. The Fund pays
interest to its custodian on such cash overdrafts, to the extent they are not
offset by positive cash balances maintained by the Fund, at a rate equal to the
Federal Funds Rate plus 0.50%. The "Reduction to custodian expenses" line item,
if applicable, represents earnings on cash balances maintained by the Fund
during the period. Such interest expense and other custodian fees may be paid
with these earnings.

- --------------------------------------------------------------------------------
SECURITY TRANSACTIONS. Security transactions are recorded on the trade date.
Realized gains and losses on securities sold are determined on the basis of
identified cost.

- --------------------------------------------------------------------------------
INDEMNIFICATIONS. The Fund's organizational documents provide current and former
trustees and officers with a limited indemnification against liabilities arising
in connection with the performance of their duties to the Fund. In the normal
course of business, the Fund may also enter into contracts that provide general
indemnifications. The Fund's maximum exposure under these arrangements is
unknown as this would be dependent on future claims that may be made against the
Fund. The risk of material loss from such claims is considered remote.

- --------------------------------------------------------------------------------
OTHER. The preparation of financial statements in conformity with U.S. generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of income and expenses during the reporting
period. Actual results could differ from those estimates.


                          31 | OPPENHEIMER MIDCAP FUND



NOTES TO FINANCIAL STATEMENTS  Unaudited / Continued
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
2. SHARES OF BENEFICIAL INTEREST

The Fund has authorized an unlimited number of no par value shares of beneficial
interest of each class. Transactions in shares of beneficial interest were as
follows:



                                  SIX MONTHS ENDED APRIL 30, 2007      YEAR ENDED OCTOBER 31, 2006
                                         SHARES            AMOUNT          SHARES           AMOUNT
- ---------------------------------------------------------------------------------------------------
                                                                         
CLASS A
Sold                                  4,144,907     $  79,155,982      12,456,104    $ 232,902,655
Redeemed                             (5,900,857)     (113,060,724)    (10,828,490)    (200,792,986)
                                     --------------------------------------------------------------
Net increase (decrease)              (1,755,950)    $ (33,904,742)      1,627,614    $  32,109,669
                                     ==============================================================

- ---------------------------------------------------------------------------------------------------
CLASS B
Sold                                    620,687     $  11,121,923       2,421,700    $  42,440,670
Redeemed                             (3,441,153)      (61,286,386)     (7,667,035)    (134,581,787)
                                     --------------------------------------------------------------
Net decrease                         (2,820,466)    $ (50,164,463)     (5,245,335)   $ (92,141,117)
                                     ==============================================================

- ---------------------------------------------------------------------------------------------------
CLASS C
Sold                                    698,081     $  12,513,266       2,268,226    $  39,902,362
Redeemed                             (1,595,855)      (28,567,909)     (2,308,632)     (40,198,696)
                                     --------------------------------------------------------------
Net decrease                           (897,774)    $ (16,054,643)        (40,406)   $    (296,334)
                                     ==============================================================

- ---------------------------------------------------------------------------------------------------
CLASS N
Sold                                    400,571     $   7,569,910       1,048,416    $  19,390,271
Redeemed                               (517,570)       (9,727,438)       (966,459)     (17,848,048)
                                     --------------------------------------------------------------
Net increase (decrease)                (116,999)    $  (2,157,528)         81,957    $   1,542,223
                                     ==============================================================

- ---------------------------------------------------------------------------------------------------
CLASS Y
Sold                                    221,051     $   4,418,554         715,427    $  13,998,045
Redeemed                               (419,095)       (8,350,932)       (755,584)     (14,534,411)
                                     --------------------------------------------------------------
Net decrease                           (198,044)    $  (3,932,378)        (40,157)   $    (536,366)
                                     ==============================================================


- --------------------------------------------------------------------------------
3. PURCHASES AND SALES OF SECURITIES

The aggregate cost of purchases and proceeds from sales of securities, other
than short-term obligations and investments in IMMF, for the six months ended
April 30, 2007, were as follows:

                                             PURCHASES           SALES
           -----------------------------------------------------------
           Investment securities          $265,761,236    $395,972,094

- --------------------------------------------------------------------------------
4. FEES AND OTHER TRANSACTIONS WITH AFFILIATES

MANAGEMENT FEES. Management fees paid to the Manager were in accordance with the
investment advisory agreement with the Fund which provides for a fee at an
annual rate of average net assets as shown in the following table:


                          32 | OPPENHEIMER MIDCAP FUND



                      FEE SCHEDULE
                      ---------------------------------
                      Up to $200 million          0.75%
                      Next $200 million           0.72
                      Next $200 million           0.69
                      Next $200 million           0.66
                      Next $700 million           0.60
                      Next $1.0 billion           0.58
                      Over $2.5 billion           0.56

- --------------------------------------------------------------------------------
ADMINISTRATION SERVICE FEES. The Fund pays the Manager a fee of $1,500 per year
for preparing and filing the Fund's tax returns.

- --------------------------------------------------------------------------------
TRANSFER AGENT FEES. OppenheimerFunds Services (OFS), a division of the Manager,
acts as the transfer and shareholder servicing agent for the Fund. The Fund pays
OFS a per account fee. For the six months ended April 30, 2007, the Fund paid
$1,831,340 to OFS for services to the Fund.

      Additionally, Class Y shares are subject to minimum fees of $10,000 per
annum for assets of $10 million or more. The Class Y shares are subject to the
minimum fees in the event that the per account fee does not equal or exceed the
applicable minimum fees. OFS may voluntarily waive the minimum fees.

- --------------------------------------------------------------------------------
DISTRIBUTION AND SERVICE PLAN (12b-1) FEES. Under its General Distributor's
Agreement with the Fund, OppenheimerFunds Distributor, Inc. (the Distributor)
acts as the Fund's principal underwriter in the continuous public offering of
the Fund's classes of shares.

- --------------------------------------------------------------------------------
SERVICE PLAN FOR CLASS A SHARES. The Fund has adopted a Service Plan for Class A
shares. It reimburses the Distributor for a portion of its costs incurred for
services provided to accounts that hold Class A shares. Reimbursement is made
periodically at an annual rate of up to 0.25% of the average annual net assets
of Class A shares of the Fund. The Distributor currently uses all of those fees
to pay dealers, brokers, banks and other financial institutions periodically for
providing personal services and maintenance of accounts of their customers that
hold Class A shares. Any unreimbursed expenses the Distributor incurs with
respect to Class A shares in any fiscal year cannot be recovered in subsequent
periods. Fees incurred by the Fund under the plan are detailed in the Statement
of Operations.

- --------------------------------------------------------------------------------
DISTRIBUTION AND SERVICE PLANS FOR CLASS B, CLASS C AND CLASS N SHARES. The Fund
has adopted Distribution and Service Plans for Class B, Class C and Class N
shares to compensate the Distributor for its services in connection with the
distribution of those shares and servicing accounts. Under the plans, the Fund
pays the Distributor an annual asset-based sales charge of 0.75% on Class B and
Class C shares and 0.25% on Class N shares. The Distributor also receives a
service fee of 0.25% per year under each plan. If either the Class B, Class C or
Class N plan is terminated by the Fund or by the shareholders of a class, the
Board of Trustees and its independent trustees must determine whether the
Distributor shall be entitled to payment from the Fund of all or a portion of
the service fee and/or asset-based sales charge in respect to shares sold prior
to the effective date of


                          33 | OPPENHEIMER MIDCAP FUND



NOTES TO FINANCIAL STATEMENTS  Unaudited/Continued
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
4. FEES AND OTHER TRANSACTIONS WITH AFFILIATES Continued

such termination. The Distributor determines its uncompensated expenses under
the plan at calendar quarter ends. The Distributor's aggregate uncompensated
expenses under the plan at March 31, 2007 for Class B, Class C and Class N
shares were $16,727,586, $5,000,041 and $724,804, respectively. Fees incurred by
the Fund under the plans are detailed in the Statement of Operations.

- --------------------------------------------------------------------------------
SALES CHARGES. Front-end sales charges and contingent deferred sales charges
(CDSC) do not represent expenses of the Fund. They are deducted from the
proceeds of sales of Fund shares prior to investment or from redemption proceeds
prior to remittance, as applicable. The sales charges retained by the
Distributor from the sale of shares and the CDSC retained by the Distributor on
the redemption of shares is shown in the following table for the period
indicated.



                                        CLASS A         CLASS B         CLASS C         CLASS N
                       CLASS A       CONTINGENT      CONTINGENT      CONTINGENT      CONTINGENT
                     FRONT-END         DEFERRED        DEFERRED        DEFERRED        DEFERRED
                 SALES CHARGES    SALES CHARGES   SALES CHARGES   SALES CHARGES   SALES CHARGES
SIX MONTHS         RETAINED BY      RETAINED BY     RETAINED BY     RETAINED BY     RETAINED BY
ENDED              DISTRIBUTOR      DISTRIBUTOR     DISTRIBUTOR     DISTRIBUTOR     DISTRIBUTOR
- ------------------------------------------------------------------------------------------------
                                                                         
April 30, 2007       $ 199,769          $ 6,331       $ 191,226         $ 6,855         $ 1,276


- --------------------------------------------------------------------------------
WAIVERS AND REIMBURSEMENTS OF EXPENSES. OFS has voluntarily agreed to limit
transfer and shareholder servicing agent fees for all classes to 0.35% of
average annual net assets per class. During the six months ended April 30, 2007,
OFS waived $150,263, $3,486, $18,056 and $14,395 for Class A, Class B, Class C
and Class N shares, respectively. This undertaking may be amended or withdrawn
at any time.

      The Manager will waive fees and/or reimburse Fund expenses in an amount
equal to the indirect management fees incurred through the Fund's investment in
IMMF. During the six months ended April 30, 2007, the Manager waived $7,279 for
IMMF management fees.

- --------------------------------------------------------------------------------
5. RECENT ACCOUNTING PRONOUNCEMENTS

In June 2006, the Financial Accounting Standards Board ("FASB") issued FASB
Interpretation No. 48 ("FIN 48"), ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES.
FIN 48 clarifies the accounting for uncertainty in income taxes recognized in an
enterprise's financial statements in accordance with FASB Statement No. 109,
ACCOUNTING FOR INCOME TAXES. FIN 48 requires the evaluation of tax positions
taken in the course of preparing the Fund's tax returns to determine whether it
is "more-likely-than-not" that tax positions taken in the Fund's tax return will
be ultimately sustained. A tax liability and expense must be recorded in respect
of any tax position that, in Management's judgment, will not be fully realized.
FIN 48 is effective for fiscal years beginning after December 15, 2006. As of
April 30, 2007, the Manager has evaluated the implications of FIN 48 and does
not currently anticipate a material impact to the Fund's financial statements.
The Manager will continue to monitor the Fund's tax positions prospectively for
potential future impacts.


                          34 | OPPENHEIMER MIDCAP FUND



      In September 2006, the FASB issued Statement of Financial Accounting
Standards ("SFAS") No. 157, FAIR VALUE MEASUREMENTS. This standard establishes a
single authoritative definition of fair value, sets out a framework for
measuring fair value and expands disclosures about fair value measurements. SFAS
No. 157 applies to fair value measurements already required or permitted by
existing standards. SFAS No. 157 is effective for financial statements issued
for fiscal years beginning after November 15, 2007, and interim periods within
those fiscal years. As of April 30, 2007, the Manager does not believe the
adoption of SFAS No. 157 will materially impact the financial statement amounts;
however, additional disclosures may be required about the inputs used to develop
the measurements and the effect of certain of the measurements on changes in net
assets for the period.


                          35 | OPPENHEIMER MIDCAP FUND



PORTFOLIO PROXY VOTING POLICIES AND PROCEDURES;
UPDATES TO STATEMENTS OF INVESTMENTS  Unaudited
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
The Fund has adopted Portfolio Proxy Voting Policies and Procedures under which
the Fund votes proxies relating to securities ("portfolio proxies") held by the
Fund. A description of the Fund's Portfolio Proxy Voting Policies and Procedures
is available (i) without charge, upon request, by calling the Fund toll-free at
1.800.525.7048, (ii) on the Fund's website at www.oppenheimerFunds.com, and
(iii) on the SEC's website at www.sec.gov. In addition, the Fund is required to
file Form N-PX, with its complete proxy voting record for the 12 months ended
June 30th, no later than August 31st of each year. The Fund's voting record is
available (i) without charge, upon request, by calling the Fund toll-free at
1.800.525.7048, and (ii) in the Form N-PX filing on the SEC's website at
www.sec.gov.

      The Fund files its complete schedule of portfolio holdings with the SEC
for the first quarter and the third quarter of each fiscal year on Form N-Q. The
Fund's Form N-Q filings are available on the SEC's website at
http://www.sec.gov. Those forms may be reviewed and copied at the SEC's Public
Reference Room in Washington D.C. Information on the operation of the Public
Reference Room may be obtained by calling 1-800-SEC-0330.


                          36 | OPPENHEIMER MIDCAP FUND



BOARD APPROVAL OF THE FUND'S INVESTMENT
ADVISORY AGREEMENT  Unaudited
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
Each year, the Board of Trustees (the "Board"), including a majority of the
independent Trustees, is required to determine whether to renew the Fund's
investment advisory agreement (the "Agreement"). The Investment Company Act of
1940, as amended, requires that the Board request and evaluate, and that the
Manager provide, such information as may be reasonably necessary to evaluate the
terms of the Agreement. The Board employs an independent consultant to prepare a
report that provides information, including comparative information that the
Board requests for that purpose. In addition, the Board receives information
throughout the year regarding Fund services, fees, expenses and performance.

      The Manager and the independent consultant provided information to the
Board on the following factors: (i) the nature, quality and extent of the
Manager's services, (ii) the investment performance of the Fund and the Manager,
(iii) the fees and expenses of the Fund, including comparative expense
information, (iv) the profitability of the Manager and its affiliates, including
an analysis of the cost of providing services by the Manager and its affiliates,
(v) the extent to which economies of scale are realized as the Fund grows and
whether fee levels reflect these economies of scale for Fund investors and (vi)
other benefits to the Manager from its relationship with the Fund. The Board was
aware that there are alternatives to retaining the Manager.

      NATURE AND EXTENT OF SERVICES. The Board considered information about the
nature and extent of the services provided to the Fund and information regarding
the Manager's key personnel who provide such services. The Manager's duties
include providing the Fund with the services of the portfolio manager and the
Manager's investment team, who provide research, analysis and other advisory
services in regard to the Fund's investments; securities trading services;
oversight of third party service providers; monitoring compliance with
applicable Fund policies and procedures and adherence to the Fund's investment
restrictions. The Manager is responsible for providing certain administrative
services to the Fund as well. Those services include providing and supervising
all administrative and clerical personnel who are necessary in order to provide
effective corporate administration for the Fund; compiling and maintaining
records with respect to the Fund's operations; preparing and filing reports
required by the Securities and Exchange Commission; preparing periodic reports
regarding the operations of the Fund for its shareholders; preparing proxy
materials for shareholder meetings; and preparing the registration statements
required by Federal and state securities laws for the sale of the Fund's shares.
The Manager also provides the Fund with office space, facilities and equipment.


                          37 | OPPENHEIMER MIDCAP FUND



BOARD APPROVAL OF THE FUND'S INVESTMENT
ADVISORY AGREEMENT  Unaudited / Continued
- --------------------------------------------------------------------------------

      QUALITY OF SERVICES. The Board also considered the quality of the services
provided and the quality of the Manager's resources that are available to the
Fund. The Board took account of the fact that the Manager has had over forty
years of experience as an investment adviser and that its assets under
management rank it among the top mutual fund managers in the United States. The
Board evaluated the Manager's administrative, accounting, legal and compliance
services, and information the Board has received regarding the experience and
professional qualifications of the Manager's personnel and the size and
functions of its staff. In its evaluation of the quality of the portfolio
management services provided, the Board considered the experience of John O'Hare
and the Manager's Growth investment team and analysts. The Board members also
considered their experiences with the Manager and its officers and other
personnel through their service as on the boards of the Fund and other funds
advised by the Manager. The Board considered information regarding the quality
of services provided by affiliates of the Manager, which its members have become
knowledgeable about in connection with the renewal of the Fund's service
agreements. In light of the foregoing, the Board concluded that the Fund
benefits from the services provided under the Agreement and from the Manager's
experience, reputation, personnel, operations, and resources.

      INVESTMENT PERFORMANCE OF THE MANAGER AND THE FUND. During the year, the
Manager provided information on the investment performance of the Fund and the
Manager at each Board meeting, including comparative performance information.
The Board also reviewed information, prepared by the Manager and by the
independent consultant, comparing the Fund's historical performance to relevant
market indices and to the performance of other retail front-end load and no-load
mid-cap growth funds advised by the Manager and by other investment advisers.
The Board noted that the Fund's one-year, three-year, and five-year performance
were below its peer group median.

      MANAGEMENT FEES AND EXPENSES. The Board reviewed the fees paid to the
Manager and its affiliates and the other expenses borne by the Fund. The Board
also evaluated the comparability of the fees charged and the services provided
to the Fund to the fees and services for other clients or accounts advised by
the Manager. The independent consultant provided comparative data in regard to
the fees and expenses of the Fund, other mid-cap growth funds and other funds
with comparable asset levels and distribution features. The Board noted that the
Fund's contractual and actual management fees are lower than its peer group
median although its total expenses are higher than its peer group median.


                          38 | OPPENHEIMER MIDCAP FUND



      ECONOMIES OF SCALE. The Board reviewed the extent to which the Manager may
realize economies of scale in managing and supporting the Fund, the extent to
which those economies of scale benefit the Fund's shareholders and the current
level of Fund assets in relation to the Fund's breakpoint schedule for its
management fees. The Board also noted the Fund's breakpoints, which are intended
to share economies of scale that may exist as the Fund grows with its
shareholders.

      BENEFITS TO THE MANAGER. The Board considered information regarding the
Manager's costs in serving as the Fund's investment adviser, including the costs
associated with the personnel and systems necessary to manage the Fund, and
information regarding the Manager's profitability from its relationship with the
Fund. The Board considered that the Manager must be able to pay and retain
experienced professional personnel at competitive rates to provide services to
the Fund and that maintaining the financial viability of the Manager is
important in order for the Manager to continue to provide significant services
to the Fund and its shareholders. In addition to considering the profits
realized by the Manager, the Board considered information regarding the direct
and indirect benefits the Manager receives as a result of its relationship with
the Fund, including compensation paid to the Manager's affiliates for services
provided and research provided to the Manager in connection with permissible
brokerage arrangements (soft dollar arrangements).

      CONCLUSIONS. These factors were also considered by the independent
Trustees meeting separately from the full Board, assisted by experienced counsel
to the Fund and the independent Trustees. Fund counsel is independent of the
Manager within the meaning and intent of the Securities and Exchange Commission
Rules.

      Based on its review of the information it received and its evaluations
described above, the Board, including a majority of the independent Trustees,
concluded that the nature, extent and quality of the services provided to the
Fund by the Manager are a benefit to the Fund and in the best interest of the
Fund's shareholders and that the amount and structure of the compensation
received by the Manager and its affiliates are reasonable in relation to the
services provided. Accordingly, the Board elected to continue the Agreement for
another year. In arriving at this decision, the Board did not single out any
factor or factors as being more important than others, but considered all of the
factors together. The Board judged the terms and conditions of the Agreement,
including the management fee, in light of all of the surrounding circumstances.


                          39 | OPPENHEIMER MIDCAP FUND



ITEM 2.  CODE OF ETHICS.

Not applicable to semiannual reports.


ITEM 3.  AUDIT COMMITTEE FINANCIAL EXPERT.

Not applicable to semiannual reports.


ITEM 4.  PRINCIPAL ACCOUNTANT FEES AND SERVICES.

Not applicable to semiannual reports.




ITEM 5.  AUDIT COMMITTEE OF LISTED REGISTRANTS

Not applicable.


ITEM 6.  SCHEDULE OF INVESTMENTS.

Not applicable.


ITEM 7.  DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END
MANAGEMENT INVESTMENT COMPANIES.

Not applicable.


ITEM 8.  PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES.

Not applicable.


ITEM 9.  PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT INVESTMENT
COMPANY AND AFFILIATED PURCHASERS.

Not applicable.


ITEM 10. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

THE FUND'S AUDIT COMMITTEE PROVISIONS WITH RESPECT TO NOMINATIONS OF
DIRECTORS/TRUSTEES TO THE RESPECTIVE BOARDS

1.  The Fund's Audit Committee (the "Committee") will evaluate potential Board
    candidates to assess their qualifications. The Committee shall have the
    authority, upon approval of the Board, to retain an executive search firm to
    assist in this effort. The Committee may consider recommendations by
    business and personal contacts of current Board members and by executive
    search firms which the Committee may engage from time to time and may also
    consider shareholder recommendations. The Committee may consider the advice
    and recommendation of the Funds' investment manager and its affiliates in
    making the selection.

2.  The Committee shall screen candidates for Board membership. The Committee
    has not established specific qualifications that it believes must be met by
    a trustee nominee. In evaluating trustee nominees, the Committee considers,
    among other things, an individual's background, skills, and experience;
    whether the individual is an "interested person" as defined in the
    Investment Company Act of 1940; and whether the individual would be deemed
    an "audit committee financial expert" within the meaning of applicable SEC
    rules.





    The Committee also considers whether the individual's background, skills,
    and experience will complement the background, skills, and experience of
    other nominees and will contribute to the Board. There are no differences in
    the manner in which the Committee evaluates nominees for trustees based on
    whether the nominee is recommended by a shareholder.

3.  The Committee may consider nominations from shareholders for the Board at
    such times as the Committee meets to consider new nominees for the Board.
    The Committee shall have the sole discretion to determine the candidates to
    present to the Board and, in such cases where required, to shareholders.
    Recommendations for trustee nominees should, at a minimum, be accompanied by
    the following:

    o   the name, address, and business, educational, and/or other pertinent
        background of the person being recommended;

    o   a statement concerning whether the person is an "interested person" as
        defined in the Investment Company Act of 1940;

    o   any other information that the Funds would be required to include in a
        proxy statement concerning the person if he or she was nominated; and

    o   the name and address of the person submitting the recommendation and, if
        that person is a shareholder, the period for which that person held Fund
        shares.

    The recommendation also can include any additional information which the
    person submitting it believes would assist the Committee in evaluating the
    recommendation.

4.  Shareholders should note that a person who owns securities issued by
    Massachusetts Mutual Life Insurance Company (the parent company of the
    Funds' investment adviser) would be deemed an "interested person" under the
    Investment Company Act of 1940. In addition, certain other relationships
    with Massachusetts Mutual Life Insurance Company or its subsidiaries, with
    registered broker-dealers, or with the Funds' outside legal counsel may
    cause a person to be deemed an "interested person."

5.  Before the Committee decides to nominate an individual as a trustee,
    Committee members and other directors customarily interview the individual
    in person. In addition, the individual customarily is asked to complete a
    detailed questionnaire which is designed to elicit information which must be
    disclosed under SEC and stock exchange rules and to determine whether the
    individual is subject to any statutory disqualification from serving as a
    trustee of a registered investment company.


ITEM 11.  CONTROLS AND PROCEDURES.

Based on their evaluation of the registrant's disclosure controls and procedures
(as defined in rule 30a-3(c) under the Investment Company Act of 1940 (17 CFR
270.30a-3(c)) as of






04/30/2007, the registrant's principal executive officer and principal financial
officer found the registrant's disclosure controls and procedures to provide
reasonable assurances that information required to be disclosed by the
registrant in the reports that it files under the Securities Exchange Act of
1934 (a) is accumulated and communicated to registrant's management, including
its principal executive officer and principal financial officer, to allow timely
decisions regarding required disclosure, and (b) is recorded, processed,
summarized and reported, within the time periods specified in the rules and
forms adopted by the U.S. Securities and Exchange Commission.

There have been no changes in the registrant's internal controls over financial
reporting that occurred during the registrant's second fiscal quarter of the
period covered by this report that have materially affected, or are reasonably
likely to materially affect, the registrant's internal control over financial
reporting.


ITEM 12.  EXHIBITS.

(a)    (1) Not applicable to semiannual reports.

       (2) Exhibits attached hereto.

       (3) Not applicable.

(b)    Exhibit attached hereto.






                                   SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment Company Act of 1940, the registrant has duly caused this report to be
signed on its behalf by the undersigned, thereunto duly authorized.

Oppenheimer MidCap Fund

By: /s/ John V. Murphy
    ---------------------------
    John V. Murphy
    Principal Executive Officer
Date: 06/12/2007

Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment Company Act of 1940, this report has been signed below by the
following persons on behalf of the registrant and in the capacities and on the
dates indicated.

By: /s/ John V. Murphy
    ---------------------------
    John V. Murphy
    Principal Executive Officer
Date: 06/12/2007

By: /s/ Brian W. Wixted
    ---------------------------
    Brian W. Wixted
    Principal Financial Officer
Date: 06/12/2007