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                                 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 811-06106

                          Pioneer Mid Cap Value Fund
               (Exact name of registrant as specified in charter)


                       60 State Street, Boston, MA 02109
              (Address of principal executive offices) (ZIP code)


            Dorothy E. Bourassa, Pioneer Investment Management, Inc.,
                       60 State Street, Boston, MA 02109
                    (Name and address of agent for service)


Registrant's telephone number, including area code:  (617) 742-7825


Date of fiscal year end:  October 31


Date of reporting period:  November 1, 2004 through April 30, 2005


Form N-CSR is to be used by management investment companies to file reports with
the Commission not later than 10 days after the transmission to stockholders of
any report that is required to be transmitted to stockholders under Rule 30e-1
under the Investment Company Act of 1940 (17 CFR 270.30e-1).  The Commission may
use the information provided on Form N-CSR in its regulatory, disclosure review,
inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-CSR,
and the Commission will make this information public. A registrant is not
required to respond to the collection of information contained in Form N-CSR
unless the Form displays a currently valid Office of Management and Budget
("OMB") control number. Please direct comments concerning the accuracy of the
information collection burden estimate and any suggestions for reducing the
burden to Secretary, Securities and Exchange Commission, 450 Fifth Street, NW,
Washington, DC 20549-0609.  The OMB has reviewed this collection of information
under the clearance requirements of 44 U.S.C. ss. 3507.


ITEM 1. REPORTS TO SHAREOWNERS.


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

                                     PIONEER
                                     -------
                                  MID CAP VALUE
                                      FUND

                                   Semiannual
                                     Report

                                     4/30/05

                                 [LOGO] PIONEER
                                        Investments(R)


Table of Contents
- --------------------------------------------------------------------------------


                                                                      
Letter to Shareowners                                                     1

Portfolio Summary                                                         2

Prices and Distributions                                                  3

Performance Update                                                        4

Comparing Ongoing Fund Expenses                                          10

Portfolio Management Discussion                                          12

Schedule of Investments                                                  16

Financial Statements                                                     25

Notes to Financial Statements                                            35

Factors Considered by the Independent Trustees in Approving
the Management Contract                                                  43

Trustees, Officers and Service Providers                                 49




Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
LETTER TO SHAREOWNERS 4/30/05
- --------------------------------------------------------------------------------

Dear Shareowner,
- --------------------------------------------------------------------------------
U.S. stocks moved higher early in 2005, with the Standard & Poor's 500 Stock
Index and the Dow Jones Industrial Average advancing to three-year highs in
early March. But from then on, soaring prices for heating oil and gasoline,
plus the steady ratcheting up of interest rates by the Federal Reserve Board
overwhelmed sentiment and caused stocks to retrace their gains. By the end of
April, the Dow Industrials, the S&P 500 and the tech-heavy NASDAQ composite
were in negative territory for the year.

With investors less welcoming of risk and the economy giving mixed signals,
value stocks were more resilient than growth stocks. In addition,
large-capitalization stocks held up better than small- and mid-sized issues
that might be more vulnerable in an economic "soft patch," in the phrase of
Federal Reserve Board Chairman Alan Greenspan.

Determined to prevent damaging inflation, the Fed has repeatedly raised
short-term interest rates. As a result, bond returns were modestly negative in
most sectors. Fixed-income investors also became more risk-averse; high-yield
and other corporate sectors retrenched after a run of stellar performance while
Treasuries and mortgage-backed securities showed small declines, with long-term
issues showing positive. Municipal revenue bonds trended higher even against a
backdrop of heavy new issuance by states and localities.

Higher U.S. interest rates enhanced the dollar's appeal and brought at least a
pause in its long, sharp drop. But the stronger dollar muted returns for U.S.
investors in overseas markets. Globally, economies rich in metals and other
industrial commodities continued to thrive on heavy demand from China and
elsewhere. Meanwhile, growth in Japan may have stalled, and Europe's expansion
moved ahead slowly.

We believe that the U.S. economy and corporate earnings will continue to grow
at a moderate pace. Oil prices have receded from their record highs, but high
energy costs and rising interest rates may be in the headlines for a while.
Looking beyond present concerns, Pioneer's global investment experts continue
to find stocks and bonds with attractive long-term potential for our domestic
and international funds.

Expanding your opportunities

This period was like all others; different classes of investments delivered
different returns. That's why allocating your portfolio across several
investment categories is one way to seek wider opportunities. Pioneer's
disciplined approach and growing range of products are designed to help you
achieve this important objective. For thoughtful guidance on how to align your
portfolio with your goals, contact your financial professional.

Please consider a fund's investment objective, risks, charges and expenses
carefully before investing. The prospectus contains this and other information
about each fund and should be read carefully before you invest or send money.
To obtain a prospectus and for other information on any Pioneer fund, contact
your financial advisor, call 1-800-225-6292 or visit our web site at
www.pioneerfunds.com.

Respectfully,

/s/ Osbert M. Hood
President
Pioneer Investment Management, Inc.

Any information in this shareholder report regarding market or economic trends
or the factors influencing the Fund's historical or future performance are
statements of the opinion of Fund management as of the date of this report.
These statements should not be relied upon for any other purposes. Past
performance is no guarantee of future results, and there is no guarantee that
market forecasts discussed will be realized.

                                                                               1


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
PORTFOLIO SUMMARY 4/30/05
- --------------------------------------------------------------------------------

Portfolio Diversification
- --------------------------------------------------------------------------------
(As a percentage of total investment portfolio)

[The following data was represented as a pie chart in the printed material.]

U.S. Common Stocks 91.5%
Temporary Cash Investments 7.7%
Depositary Receipts for International Stocks 0.8%

Sector Distribution
- --------------------------------------------------------------------------------
(As a percentage of equity holdings)

[The following data was represented as a pie chart in the printed material.]

Consumer Discretionary 22.3%
Financials 19.1%
Information Technology 9.7%
Health Care 9.6%
Industrials 8.9%
Materials 8.2%
Utilities 7.8%
Consumer Staples 7.5%
Energy 6.8%
Telecommunication Services 0.1%

10 Largest Holdings
- --------------------------------------------------------------------------------
(As a percentage of equity holdings)*


                                                                    
 1.   Foot Locker, Inc.                                                   2.46%
 2.   Safeway, Inc.                                                       2.15
 3.   Republic Services, Inc.                                             1.96
 4.   Mattel, Inc.                                                        1.86
 5.   Triad Hospitals, Inc.                                               1.86
 6.   PPG Industries, Inc.                                                1.85
 7.   The PMI Group, Inc.                                                 1.82
 8.   Providian Financial Corp.                                           1.74
 9.   Tenet Healthcare Corp.                                              1.66
10.   BJ's Wholesale Club, Inc.                                           1.64


*This list excludes temporary cash and derivative instruments. The portfolio is
 actively managed, and current holdings may be different.

2


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
PRICES AND DISTRIBUTIONS
- --------------------------------------------------------------------------------

Net Asset Value Per Share
- --------------------------------------------------------------------------------



 Class                  4/30/05          10/31/04
 -----                  -------          --------
                                    
  A                     $24.33            $25.57
  B                     $21.79            $23.32
  C                     $21.63            $23.15
  R                     $24.20            $25.46
  Y                     $25.08            $26.17


 Class                  4/30/05          12/13/04
 -----                  -------          --------
                                    
Investor Class Shares   $24.34            $24.13


Distributions Per Share
- --------------------------------------------------------------------------------



                                       5/1/04 - 4/30/05
                                       ----------------
                            Net
                        Investment         Short-Term      Long-Term
 Class                    Income         Capital Gains   Capital Gains
 -----                  ----------       -------------   -------------
                                                   
  A                        $ -              $0.1828         $2.9742
  B                        $ -              $0.1828         $2.9742
  C                        $ -              $0.1828         $2.9742
  R                        $ -              $0.1828         $2.9742
  Y                        $ -              $0.1828         $2.9742


                                       12/11/04 - 4/30/05
                                       ------------------
                            Net
                        Investment         Short-Term      Long-Term
 Class                    Income         Capital Gains   Capital Gains
 -----                  ----------       -------------   -------------
                                                   
Investor Class Shares      $ -              $   -           $   -


                                                                               3


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
PERFORMANCE UPDATE 4/30/05                                        CLASS A SHARES
- --------------------------------------------------------------------------------

Investment Returns
- --------------------------------------------------------------------------------

The mountain chart below shows the change in value of a $10,000 investment made
in Pioneer Mid Cap Value Fund at public offering price, compared to that of the
Russell Midcap Value Index.

Average Annual Total Returns
(As of April 30, 2005)



                                        Public
                          Net Asset    Offering
Period                      Value     Price (POP)
                                  
10 Years                    11.23%      10.58%
5 Years                     11.70       10.38
1 Year                      15.97        9.30


[The following data was represented as a mountain chart in the printed
material.]

Value of a $10,000 Investment



              Pioneer Mid Cap       Russell Midcap
                Value Fund            Value Index
                                  
04/95              9425                 10000
                  12082                 12787
04/97             12292                 15057
                  16183                 21221
04/99             14867                 21624
                  15720                 20655
04/01             19279                 24706
                  20088                 26784
04/03             17231                 23169
                  23569                 31261
04/05             27334                 37607


Call 1-800-225-6292 or visit www.pioneerfunds.com for the most recent month-end
performance results. Current performance may be lower or higher than the
performance data quoted.

The performance data quoted represents past performance, which is no guarantee
of future results. Investment return and principal value will fluctuate, and
shares, when redeemed, may be worth more or less than their original cost.

NAV results represent the percent change in net asset value per share. Returns
would have been lower had sales charges been reflected. POP returns reflect
deduction of maximum 5.75% sales charge. All results are historical and assume
the reinvestment of dividends and capital gains. Other share classes are
available for which performance and expenses will differ. Performance results
reflect any applicable expense waivers in effect during the periods shown.
Without such waivers Fund performance would be lower. Waivers may not be in
effect for all funds. Certain fee waivers are contractual through a specified
period. Otherwise, fee waivers can be rescinded at any time. See the prospectus
and financial statements for more information.

The performance table and graph do not reflect the deduction of fees and taxes
that a shareowner would pay on Fund distributions or the redemption of Fund
shares.

The Russell Midcap Value Index measures the performance of U.S. mid-cap value
stocks. Index returns assume reinvestment of dividends and, unlike Fund returns,
do not reflect any fees, expenses or sales charges. You cannot invest directly
in an Index.

4


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
PERFORMANCE UPDATE 4/30/05                                        CLASS B SHARES
- --------------------------------------------------------------------------------

Investment Returns
- --------------------------------------------------------------------------------

The mountain chart below shows the change in value of a $10,000 investment made
in Pioneer Mid Cap Value Fund, compared to that of the Russell Midcap Value
Index.

Average Annual Total Returns
(As of April 30, 2005)



                               If         If
Period                        Held     Redeemed
                                   
10 Years                     10.34%      10.34%
5 Years                      10.75       10.75
1 Year                       14.89       10.89


[The following data was represented as a mountain chart in the printed
material.]

Value of a $10,000 Investment



              Pioneer Mid Cap       Russell Midcap
                Value Fund            Value Index
                                  
4/95              10000                 10000
                  12724                 12787
4/97              12843                 15057
                  16179                 19652
4/99              15302                 21624
                  16049                 20655
4/01              19525                 24706
                  20184                 26784
4/03              17168                 23169
                  23274                 31261
4/05              26740                 37607


Call 1-800-225-6292 or visit www.pioneerfunds.com for the most recent month-end
performance results. Current performance may be lower or higher than the
performance data quoted.

The performance data quoted represents past performance, which is no guarantee
of future results. Investment return and principal value will fluctuate, and
shares, when redeemed, may be worth more or less than their original cost.

"If held" results represent the percent change in net asset value per share.
Returns would have been lower had sales charges been reflected. "If redeemed"
returns reflect the deduction of applicable contingent deferred sales charge
(CSDC). Effective December 1, 2004, the period during which a CDSC is applied to
withdrawals was shortened to 5 years. The maximum CDSC for Class B shares
continues to be 4%. For more complete information, please see the prospectus for
details. Note: Shares purchased prior to December 1, 2004 remain subject to the
CDSC in effect at the time you purchased those shares. For performance
information for shares purchased prior to December 1, 2004, please visit
www.pioneerfunds.com/bshares. All results are historical and assume the
reinvestment of dividends and capital gains. Other share classes are available
for which performance and expenses will differ.

Performance results reflect any applicable expense waivers in effect during the
periods shown. Without such waivers Fund performance would be lower. Waivers may
not be in effect for all funds. Certain fee waivers are contractual through a
specified period. Otherwise, fee waivers can be rescinded at any time. See the
prospectus and financial statements for more information.

The performance table and graph do not reflect the deduction of fees and taxes
that a shareowner would pay on Fund distributions or the redemption of Fund
shares.

The Russell Midcap Value Index measures the performance of U.S. mid-cap value
stocks. Index returns assume reinvestment of dividends and, unlike Fund returns,
do not reflect any fees, expenses or sales charges. You cannot invest directly
in an Index.

                                                                               5


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
PERFORMANCE UPDATE 4/30/05                                        CLASS C SHARES
- --------------------------------------------------------------------------------

Investment Returns
- --------------------------------------------------------------------------------

The mountain chart below shows the change in value of a $10,000 investment made
in Pioneer Mid Cap Value Fund at public offering price, compared to that of the
Russell Midcap Value Index.

Average Annual Total Returns
(As of April 30, 2005)



                                 If         If
Period                          Held     Redeemed
                                    
Life-of-Class
(1/31/96)                       9.39%      9.39%
5 Years                        10.72      10.72
1 Year                         15.01      15.01


[The following data was represented as a mountain chart in the printed
material.]

Value of a $10,000 Investment



              Pioneer Mid Cap       Russell Midcap
                Value Fund            Value Index
                                  
01/96             10000                 10000
                  10931                 10396
04/97             11045                 12241
                  14433                 17252
04/99             13144                 17580
                  13780                 16792
04/01             16745                 20086
                  17305                 21775
04/03             14712                 18837
                  19934                 25415
04/05             22926                 30575


Call 1-800-225-6292 or visit www.pioneerfunds.com for the most recent month-end
performance results. Current performance may be lower or higher than the
performance data quoted.

The performance data quoted represents past performance, which is no guarantee
of future results. Investment return and principal value will fluctuate, and
shares, when redeemed, may be worth more or less than their original cost.

"If held" results represent the percent change in net asset value per share.
Returns would have been lower had sales charges been reflected. Class C shares
held for less than one year are also subject to a 1% contingent deferred sales
charge (CDSC). The performance of Class C shares does not reflect the 1%
front-end sales charge in effect prior to February 1, 2004. If you paid a 1%
sales charge, your returns would be lower than those shown above. All results
are historical and assume the reinvestment of dividends and capital gains. Other
share classes are available for which performance and expenses will differ.
Performance results reflect any applicable expense waivers in effect during the
periods shown. Without such waivers Fund performance would be lower. Waivers may
not be in effect for all funds. Certain fee waivers are contractual through a
specified period. Otherwise, fee waivers can be rescinded at any time. See the
prospectus and financial statements for more information.

The performance table and graph do not reflect the deduction of fees and taxes
that a shareowner would pay on Fund distributions or the redemption of Fund
shares.

The Russell Midcap Value Index measures the performance of U.S. mid-cap value
stocks. Index returns assume reinvestment of dividends and, unlike Fund returns,
do not reflect any fees, expenses or sales charges. You cannot invest directly
in an Index.

6


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
PERFORMANCE UPDATE 4/30/05                                 INVESTOR CLASS SHARES
- --------------------------------------------------------------------------------

Investment Returns
- --------------------------------------------------------------------------------

Average Annual Total Returns
(As of April 30, 2005)



                                If        If
Period                         Held    Redeemed
                                   
Life-of-Class
(12/13/04)                     1.42%     1.42%


Call 1-800-225-6292 or visit www.pioneerfunds.com for the most recent month-end
performance results. Current performance may be lower or higher than the
performance data quoted.

The performance data quoted represents past performance, which is no guarantee
of future results. Investment return and principal value will fluctuate, and
shares, when redeemed, may be worth more or less than their original cost.

Certain Pioneer funds (the "Funds") issued Investor Class shares in connection
with the reorganization of Safeco mutual funds. The Funds are not offering
additional Investor Class shares except in connection with the reinvestment of
dividends on the Funds' outstanding Investor Class shares. All Investor Class
shares of the Funds, whenever issued, convert to Class A shares of their
respective Funds on December 10, 2006. Investor Class shares are not subject to
sales charges.

Performance results reflect any applicable expense waivers in effect during the
periods shown. Without such waivers Fund performance would be lower. Waivers may
not be in effect for all funds. Certain fee waivers are contractual through a
specified period. Otherwise, fee waivers can be rescinded at any time. See the
prospectus and financial statements for more information.

The performance table does not reflect the deduction of fees and taxes that a
shareowner would pay on Fund distributions or the redemption of Fund shares.

                                                                               7


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
PERFORMANCE UPDATE 4/30/05                                        CLASS R SHARES
- --------------------------------------------------------------------------------

Investment Returns
- --------------------------------------------------------------------------------

The mountain chart below shows the change in value of a $10,000 investment made
in Pioneer Mid Cap Value Fund at public offering price, compared to that of the
Russell Midcap Value Index.

Average Annual Total Returns
(As of April 30, 2005)



                             If          If
Period                      Held      Redeemed
                                  
10 Years                    10.78%      10.78%
5 Years                     11.33       11.33
1 Year                      15.86       15.86


[The following data was represented as a mountain chart in the printed
material.]

Value of a $10,000 Investment



              Pioneer Mid Cap       Russell Midcap
                Value Fund            Value Index
                                  
01/96             10000                 10000
                  12757                 12787
04/97             12915                 15057
                  16917                 21221
04/99             15464                 21624
                  16275                 20655
04/01             19852                 24706
                  20593                 26784
04/03             17579                 23169
                  24028                 31261
04/05             27838                 37607


Call 1-800-225-6292 or visit www.pioneerfunds.com for the most recent month-end
performance results. Current performance may be lower or higher than the
performance data quoted.

The performance data quoted represents past performance, which is no guarantee
of future results. Investment return and principal value will fluctuate, and
shares, when redeemed, may be worth more or less than their original cost.

Class R shares are not subject to sales charges and are available for limited
groups of eligible investors, including retirement plan investors. The
performance of Class R shares for the period prior to the commencement of
operations of Class R shares on 4/1/03 is based on the performance of Class A
shares, reduced to reflect the higher distribution and service fees of Class R
shares. For the period after April 1, 2003, the actual performance of Class R
shares is reflected, which performance may be influenced by the smaller asset
size of Class R shares compared to Class A shares. The performance of Class R
shares does not reflect the 1% CDSC that was in effect prior to July 1, 2004.
All results are historical and assume the reinvestment of dividends and capital
gains. Other share classes are available for which performance and expenses will
differ. Performance results reflect any applicable expense waivers in effect
during the periods shown. Without such waivers Fund performance would be lower.
Waivers may not be in effect for all funds. Certain fee waivers are contractual
through a specified period. Otherwise, fee waivers can be rescinded at any time.
See the prospectus and financial statements for more information.

The performance table and graph do not reflect the deduction of fees and taxes
that a shareowner would pay on Fund distributions or the redemption of Fund
shares.

The Russell Midcap Value Index measures the performance of U.S. mid-cap value
stocks. Index returns assume reinvestment of dividends and, unlike Fund returns,
do not reflect any fees, expenses or sales charges. You cannot invest directly
in an Index.

8


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
PERFORMANCE UPDATE 4/30/05                                        CLASS Y SHARES
- --------------------------------------------------------------------------------

Investment Returns
- --------------------------------------------------------------------------------

The mountain chart below shows the change in value of a $10,000 investment made
in Pioneer Mid Cap Value Fund, compared to that of the Russell Midcap Value
Index.

Average Annual Total Returns
(As of April 30, 2005)



                             If           If
Period                      Held       Redeemed
                                  
10 Years                    11.62%      11.62%
5 Years                     12.27       12.27
1 Year                      16.70       16.70


[The following data was represented as a mountain chart in the printed
material.]

Value of a $10,000 Investment



              Pioneer Mid Cap       Russell Midcap
                Value Fund            Value Index
                                  
04/95             10000                 10000
                  12819                 12787
04/97             13041                 15057
                  17170                 21221
04/99             15843                 21624
                  16835                 20655
04/01             20743                 24706
                  21716                 26784
04/03             18722                 23169
                  25735                 31261
04/05             30032                 37607


Call 1-800-225-6292 or visit www.pioneerfunds.com for the most recent month-end
performance results. Current performance may be lower or higher than the
performance data quoted.

The performance data quoted represents past performance, which is no guarantee
of future results. Investment return and principal value will fluctuate, and
shares, when redeemed, may be worth more or less than their original cost.

Performance for periods prior to the inception of Y shares reflects the NAV
performance of the Fund's A shares. The performance does not reflect differences
in expenses, including the Rule 12b-1 fees applicable to A shares. Since fees
for A shares are generally higher than those of Y shares, the performance shown
for Y shares prior to their inception would have been higher. Class A shares are
used as a proxy from 7/25/90 to 7/2/98. Class Y shares are not subject to sales
charges and are available for limited groups of eligible investors, including
institutional investors. All results are historical and assume the reinvestment
of dividends and capital gains. Other share classes are available for which
performance and expenses will differ.

Performance results reflect any applicable expense waivers in effect during the
periods shown. Without such waivers Fund performance would be lower. Waivers may
not be in effect for all funds and can be rescinded at any time. See the
prospectus and financial statements for complete details.

The performance table and graph do not reflect the deduction of fees and taxes
that a shareowner would pay on Fund distributions or the redemption of Fund
shares.

Index comparison begins 7/31/98. The Russell Midcap Value Index measures the
performance of U.S. mid-cap value stocks. Index returns assume reinvestment of
dividends and, unlike Fund returns, do not reflect any fees, expenses or sales
charges. You cannot invest directly in an Index.

                                                                               9


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
COMPARING ONGOING FUND EXPENSES
- --------------------------------------------------------------------------------

As a shareowner in the Fund, you incur two types of costs:

(1) ongoing costs, including management fees, distribution and/or service
    (12b-1) fees, and other Fund expenses; and

(2) transaction costs, including sales charges (loads) on purchase payments.

This example is intended to help you understand your ongoing expenses (in
dollars) of investing in the Fund and to compare these costs with the ongoing
costs of investing in other mutual funds. The example is based on an investment
of $1,000 at the beginning of the Fund's latest six-month period and held
throughout the six months.

Using the Tables

Actual Expenses

The first table below provides information about actual account values and
actual expenses. You may use the information in this table, together with the
amount you invested, to estimate the expenses that you paid over the period as
follows:

1. Divide your account value by $1,000
   Example: an $8,600 account value - $1,000 = 8.6

2. Multiply the result in (1) above by the corresponding share class's number
   in the third row under the heading entitled "Expenses Paid During Period"
   to estimate the expenses you paid on your account during this period.

Expenses Paid on a $1,000 Investment in Pioneer Mid Cap Value Fund

Based on actual returns from November 1, 2004 through April 30, 2005



                                                                                     Investor
Share Class             A            B            C            R            Y          Class
- ------------------------------------------------------------------------------------------------
                                                                   
Beginning Account   $1,000.00    $1,000.00    $1,000.00    $1,000.00    $1,000.00    $1,000.00
Value On 11/1/04

Ending Account      $1,078.10    $1,072.60    $1,073.60    $1,077.60    $1,082.20    $1,014.20
Value On 4/30/05

Expenses Paid       $    5.98    $   10.74    $   10.28    $    6.70    $    3.82    $    3.93
During Period*


*  Expenses are equal to the Fund's annualized expense ratio of 1.16%, 2.10%,
   2.01%, 1.30%, 0.79%, and 1.01% for Class A, Class B, Class C, Class R,
   Class Y and Investor Class shares, respectively, multiplied by the average
   account value over the period, multiplied by 184/365 (to reflect the
   one-half year period) (142/365 for Investor Class shares).

10


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------

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

Hypothetical Example for Comparison Purposes

The table below provides information about hypothetical account values and
hypothetical expenses based on the Fund's actual expense ratio 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 with the
5% hypothetical examples that appear in the shareholder reports of the other
funds.

Please note that the expenses shown in the tables are meant to highlight your
ongoing costs only and do not reflect any transaction costs, such as sales
charges (loads) that are charged at the time of the transaction. Therefore, the
table below is useful in comparing ongoing costs only and will not help you
determine the relative total costs of owning different funds. In addition, if
these transaction costs were included, your costs would have been higher.

Expenses Paid on a $1,000 Investment in Pioneer Mid Cap Value Fund

Based on a hypothetical 5% per year return before expenses, reflecting the
period from November 1, 2004 through April 30, 2005



                                                                                     Investor
Share Class             A            B            C            R            Y          Class
- ------------------------------------------------------------------------------------------------
                                                                   
Beginning Account   $1,000.00    $1,000.00    $1,000.00    $1,000.00    $1,000.00    $1,000.00
Value On 11/1/04

Ending Account      $1,019.04    $1,014.43    $1,014.88    $1,018.35    $1,021.12    $1,015.14
Value On 4/30/05

Expenses Paid       $    5.81    $   10.44    $    9.99    $    6.51    $    3.71    $    3.93
During Period*


*  Expenses are equal to the Fund's annualized expense ratio of 1.16%, 2.10%,
   2.01%, 1.30%, 0.74%, and 1.01% for Class A, Class B, Class C, Class R,
   Class Y and Investor Class shares, respectively, multiplied by the average
   account value over the period, multiplied by 184/365 (to reflect the
   one-half year period) (142/365 for Investor Class shares).

                                                                              11


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
PORTFOLIO MANAGEMENT DISCUSSION 4/30/05
- --------------------------------------------------------------------------------

The stock market was volatile throughout the six-month period ended April 30,
2005, as investors reacted to changing signals about the health of the economy
and the impact of the Federal Reserve Board's decisions to raise short-term
interest rates. Over the period, mid-cap stocks performed well in relation to
the overall market, while value-oriented strategies tended to outperform
growth-oriented styles. In the following discussion, Rod Wright, portfolio
manager of Pioneer Mid Cap Value Fund, provides an update on the Fund, its
investment strategies and the economic environment during the six-month period.

Q:  How did the Fund perform?

A:  Pioneer Mid Cap Value Fund performed relatively well in a challenging
    environment, outperforming its Lipper peer group, while trailing its
    benchmark index. The Fund's Class A shares had a total return of 7.81% at
    net asset value for the six months ended April 30, 2005. During the same
    period, the benchmark Russell Midcap Value Index gained 8.81%, while the
    average return of the 245 funds in Lipper's mid-cap value category was
    5.46%.

    Call 1-800-225-6292 or visit www.pioneerfunds.com for the most recent
    month-end performance results. Current performance may be lower or higher
    than the performance data quoted.

    The performance data quoted represents past performance, which is no
    guarantee of future results. Investment return and principal value will
    fluctuate, and shares, when redeemed, may be worth more or less than their
    original cost.

Q:  What were the principal factors that affected performance?

A:  The six-month period started with a strong market rally. Stocks paying
    relatively high dividends performed especially well. The surge was triggered
    by the re-election of President Bush, an event which quelled fears about the
    possible end of tax cuts on income from dividends. The rally stalled early
    in 2005, however, amid fears that the Federal Reserve Board's increases in
    short-term interest rates might undermine the economic recovery. In
    addition, investors worried about the impending elections in Iraq. However,
    February brought a brief market recovery because of Iraq's successful
    election experience and greater optimism about the domestic economy and
    corporate profitability. But sentiment changed once again in late February
    because of anxiety about the state of the economy and the effects of rising
    energy prices. The

12


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------

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

    dominant trend was for stock prices to decline in the final weeks of the
    period.

    In this continually changing environment, mid-cap value stocks tended to
    outperform the overall market. With the dramatic increases in oil and
    natural gas prices, the energy sector was the best-performing part of the
    market. We were overweight in energy stocks for the first three months of
    the period, but reduced our positions and took profits when we believed
    commodity prices were approaching their peak. As we did so, we increased
    our holdings in consumer discretionary stocks, where we found many
    companies attractively priced. The Fund's results were largely in line
    with the benchmark Russell Midcap Value Index, although performance was
    not supported by our de-emphasis of companies, such as utilities, that
    could potentially be harmed by increasing interest rates. In general, we
    do not make decisions based on broad economic trends, but focus primarily
    on individual security selection, looking at stock prices in relation to
    underlying company fundamentals.

Q:  What were some of the individual investments that most affected performance?

A:  We had exceptional performance from investments in companies in which we had
    invested at depressed prices. Several holdings were able to turn around
    their finances, while others were in corporations that were taken over at
    premiums to their stock prices. One of the leading performers was Triad
    Hospitals, whose valuation had plunged during 2004 amid general concerns
    about the profitability of hospital chains because of uncertainties about
    factors such as medical reimbursements. However, Triad and other hospital
    stocks recovered in 2005 as those concerns dissipated. Two other health-care
    investments that appreciated strongly were Cigna, a specialist in life and
    health insurance, including managed-care programs, and McKesson, a
    pharmaceutical distribution company. Both companies successfully turned
    around their businesses and saw their stock prices respond.

    Two industrial companies that benefited from the cyclical recovery were
    Flowserve, a manufacturer of pumps and valves, and American Standard,
    which produces plumbing supplies and air conditioning systems.

                                                                              13


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
PORTFOLIO MANAGEMENT DISCUSSION 4/30/05                              (continued)
- --------------------------------------------------------------------------------

    Several companies received acquisition offers during the period, lifting
    their stock prices. They included SunGard Data Systems and Toys R Us, both
    of which were taken over by private equity firms; United Defense
    Industries, a defense contractor best known for its Bradley Fighting
    Vehicle, which was taken over by BEA; and VERITAS, which is being acquired
    by Symantec.

    Other investments that supported performance included: Blockbuster, whose
    stock price rose by more than 45% during the period following its spin-off
    by Viacom; and White Mountain Insurance Group, a diversified specialty
    insurer whose stock price gained more than 30%.

Q:  Were there any disappointments?

A:  The biggest detractor was a top-performing stock in the Index that we did
    not own: Valero Energy, an independent oil refiner that posted gains in the
    general rally of the energy sector.

    Fund holdings that hurt performance included PMI Group, BJ's Wholesale
    Club, and Eastman Kodak. The stock price of PMI Group, which provides
    private homeowners' insurance, slumped when mortgage rates remained low,
    encouraging homeowners to refinance. PMI's profits normally improve when
    interest rates rise and homeowners don't refinance. BJ's Wholesale's
    gasoline retail business was exposed to rapid increases in gasoline
    prices, while Eastman Kodak had a disappointing quarterly earnings report.
    Despite these disappointments over the six months, we continued to favor
    the longer-term prospects of PMI, BJ's and Eastman Kodak and still held
    positions in the companies at the end of the six-month period.

Q: What is your investment outlook?

A: We continue to see potential opportunities among mid-cap value companies,
    although our enthusiasm is tempered because of a number of concerns. On
    the positive side, interest rates remain low, gross domestic product
    continues to grow at a reasonable rate, and the economy is still adding
    new jobs. However, we think there is some evidence that the pace of
    economic growth is slowing and is being held back by high energy prices.

14


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------

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

    We will hold to our long-term discipline and emphasize strong companies
    with attractive stock valuations.



Investing in mid-sized companies may offer the potential for higher returns,
but these companies are also subject to greater short-term price fluctuations
than larger, more established companies.

Any information in this shareholder report regarding market or economic trends
or the factors influencing the Fund's historical or future performance are
statements of the opinion of Fund management as of the date of this report.
These statements should not be relied upon for any other purposes. Past
performance is no guarantee of future results, and there is no guarantee that
market forecasts discussed will be realized.

                                                                              15


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
SCHEDULE OF INVESTMENTS 4/30/05 (unaudited)
- --------------------------------------------------------------------------------



  Shares                                                                 Value
                                                            
               COMMON STOCKS - 97.3%
               Energy - 6.7%
               Integrated Oil & Gas - 1.4%
  463,800      Occidental Petroleum Corp.                         $ 32,002,200
                                                                  ------------
               Oil & Gas Drilling - 3.0%
  500,000      ENSCO International, Inc.                          $ 16,300,000
  350,000      Nabors Industries, Inc.*                             18,854,500
   53,300      Pride International, Inc*                             1,188,590
  375,000      Transocean Offshore, Inc.*                           17,388,750
  300,000      Weatherford Intl, Inc.*                              15,645,000
                                                                  ------------
                                                                  $ 69,376,840
                                                                  ------------
               Oil & Gas Exploration & Production - 2.3%
   25,500      Apache Corp.                                       $  1,435,395
   20,900      Anadarko Petroleum Corp.                              1,526,536
  541,200      Devon Energy Corp.                                   24,446,004
  625,000      Pioneer Natural Resources Co.                        25,412,500
   46,000      XTO Energy, Inc.                                      1,387,820
                                                                  ------------
                                                                  $ 54,208,255
                                                                  ------------
               Total Energy                                       $155,587,295
                                                                  ------------
               Materials - 8.0%
               Commodity Chemicals - 1.4%
  550,000      Air Products & Chemicals, Inc.                     $ 32,301,500
                                                                  ------------
               Diversified Chemical - 1.8%
  624,000      PPG Industries, Inc.                               $ 42,151,200
                                                                  ------------
               Diversified Metals & Mining - 1.2%
  515,400      Freeport-McMoRan Copper & Gold, Inc. (Class B)     $ 17,863,764
  128,800      Phelps Dodge Corp.                                   11,057,480
                                                                  ------------
                                                                  $ 28,921,244
                                                                  ------------
               Metal & Glass Containers - 1.5%
  900,000      Ball Corp.                                         $ 35,550,000
                                                                  ------------
               Paper Products - 2.1%
  625,000      Flowserve Corp.*                                   $ 17,350,000
1,030,800      Meadwestvaco Corp.                                   30,357,060
                                                                  ------------
                                                                  $ 47,707,060
                                                                  ------------
               Total Materials                                    $186,631,004
                                                                  ------------


16   The accompanying notes are an integral part of these financial statements.


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------

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



   Shares                                                      Value
                                                  
               Capital Goods - 3.1%
               Aerospace & Defense - 0.1%
   21,200      Northrop Grumman Corp.                   $  1,162,608
                                                        ------------
               Construction & Farm Machinery & Heavy Trucks - 0.0%
   20,000      Terex Corp.*                             $    747,600
                                                        ------------
               Electrical Component & Equipment - 0.6%
1,000,000      Symbol Technologies, Inc.                $ 13,370,000
                                                        ------------
               Industrial Conglomerates - 2.4%
  650,000      American Standard Companies, Inc.        $ 29,061,500
  300,000      ITT Industries, Inc.                       27,138,000
                                                        ------------
                                                        $ 56,199,500
                                                        ------------
               Total Capital Goods                      $ 71,479,708
                                                        ------------
               Commercial Services & Supplies - 4.3%
               Commercial Printing - 1.4%
  975,000      R.R. Donnelly & Sons Co.                 $ 32,087,250
                                                        ------------
               Diversified Commercial Services - 1.0%
  375,000      The Dun & Bradstreet Corp.*              $ 23,415,000
   47,300      FTI Consulting, Inc.*                       1,044,384
                                                        ------------
                                                        $ 24,459,384
                                                        ------------
               Environmental & Facilities Services - 1.9%
1,288,000      Republic Services, Inc.                  $ 44,564,800
                                                        ------------
               Total Commercial Services & Supplies     $101,111,434
                                                        ------------
               Transportation - 1.3%
               Airlines - 0.5%
  800,000      Southwest Airlines Co.                   $ 11,904,000
                                                        ------------
               Railroads - 0.8%
  325,000      Canadian National Railway Co.            $ 18,593,250
                                                        ------------
               Total Transportation                     $ 30,497,250
                                                        ------------
               Automobiles & Components - 0.1%
               Automobile Manufacturers - 0.1%
   34,300      Monaco Coach Corp.                       $    486,374
   15,750      PACCAR, Inc.                                1,069,425
                                                        ------------
                                                        $  1,555,799
                                                        ------------
               Total Automobiles & Components           $  1,555,799
                                                        ------------


The accompanying notes are an integral part of these financial statements.   17


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
SCHEDULE OF INVESTMENTS 4/30/05 (unaudited) (continued)
- --------------------------------------------------------------------------------



   Shares                                                           Value
                                                       
               Consumer Durables & Apparel - 4.8%
               Housewares & Specialties - 1.6%
  400,000      Whirlpool Corp.*                              $ 24,824,000
  474,100      Yankee Candle Co*                               13,175,239
                                                             ------------
                                                             $ 37,999,239
                                                             ------------
               Leisure Products - 1.8%
2,350,000      Mattel, Inc.                                  $ 42,417,500
                                                             ------------
               Photographic Products - 1.4%
1,300,000      Eastman Kodak Co. (b)                         $ 32,500,000
                                                             ------------
               Total Consumer Durables & Apparel             $112,916,739
                                                             ------------
               Consumer Services - 2.7%
               Restaurants - 1.3%
  900,000      Ruby Tuesday, Inc.                            $ 20,250,000
  200,000      Tricon Global Restaurants, Inc                   9,392,000
                                                             ------------
                                                             $ 29,642,000
                                                             ------------
               Specialized Consumer Services - 1.4%
  650,000      H & R Block, Inc.                             $ 32,376,500
                                                             ------------
               Total Consumer Services                       $ 62,018,500
                                                             ------------
               Media - 4.5%
               Advertising - 1.3%
2,400,000      The Interpublic Group of Companies, Inc.*     $ 30,864,000
                                                             ------------
               Broadcasting & Cable TV - 1.3%
  950,000      Entercom Communications Corp.*                $ 30,618,500
                                                             ------------
               Movies & Entertainment - 0.9%
1,025,000      Regal Entertainment Group (b)                 $ 20,797,250
   30,000      Viacom, Inc. (Class B)                           1,038,600
                                                             ------------
                                                             $ 21,835,850
                                                             ------------
               Publishing - 1.0%
  575,000      Tribune Co.                                   $ 22,195,000
                                                             ------------
               Total Media                                   $105,513,350
                                                             ------------
               Retailing - 9.6%
               Apparel Retail - 1.0%
  618,500      Liz Claiborne, Inc.                           $ 21,913,455
                                                             ------------


18    The accompanying notes are an integral part of these financial statements.


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------

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



  Shares                                                      Value
                                                 
               Department Stores - 1.5%
  620,000      Federated Department Stores, Inc.       $ 35,650,000
                                                       ------------
               General Merchandise Stores - 0.8%
  800,000      American Greetings Corp.                $ 18,120,000
                                                       ------------
               Internet Retail - 1.5%
1,650,000      InterActive Corp.*(b)                   $ 35,871,000
                                                       ------------
               Specialty Stores - 4.8%
3,272,000      Blockbuster, Inc. (b)                   $ 32,392,800
2,100,000      Foot Locker, Inc.                         55,986,000
  800,000      Tiffany & Co.                             24,120,000
                                                       ------------
                                                       $112,498,800
                                                       ------------
               Total Retailing                         $224,053,255
                                                       ------------
               Food & Drug Retailing - 6.8%
               Drug Retail - 1.5%
  665,000      CVS Corp.                               $ 34,300,700
                                                       ------------
               Food Distributors - 0.1%
   17,500      Amerisourcebergen Corp.                 $  1,072,400
   38,900      Performance Food Group Co.*                1,046,021
                                                       ------------
                                                       $  2,118,421
                                                       ------------
               Food Retail - 3.6%
  425,000      ConAgra, Inc. (b)                       $ 11,368,750
  700,000      Dean Foods Co.*                           24,052,000
2,300,000      Safeway, Inc.                             48,967,000
                                                       ------------
                                                       $ 84,387,750
                                                       ------------
               Hypermarkets & Supercenters - 1.6%
1,400,000      BJ'S Wholesale Club, Inc.*(b)           $ 37,310,000
                                                       ------------
               Total Food & Drug Retailing             $158,116,871
                                                       ------------
               Food, Beverage & Tobacco - 0.1%
               Soft Drinks - 0.1%
   24,500      PepsiCo, Inc.                           $  1,363,180
                                                       ------------
               Total Food, Beverage & Tobacco          $  1,363,180
                                                       ------------
               Household & Personal Products - 0.4%
               Personal Products - 0.4%
  550,000      Perrigo Co.*                            $ 10,076,000
                                                       ------------
               Total Household & Personal Products     $ 10,076,000
                                                       ------------


The accompanying notes are an integral part of these financial statements.   19


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
SCHEDULE OF INVESTMENTS 4/30/05 (unaudited) (continued)
- --------------------------------------------------------------------------------



  Shares                                                         Value
                                                    
               Health Care Equipment & Services - 7.1%
               Health Care Distributors - 1.1%
  375,000      McKesson Corp.                             $ 13,875,000
  402,400      Par Pharmaceutical Co., Inc.*                12,084,072
                                                          ------------
                                                          $ 25,959,072
                                                          ------------
               Health Care Equipment - 0.9%
  725,000      Boston Scientific Corp.*                   $ 21,445,500
                                                          ------------
               Health Care Facilities - 3.4%
3,164,563      Tenet Healthcare Corp.*                    $ 37,879,819
  825,000      Triad Hospitals, Inc.*                       42,281,250
                                                          ------------
                                                          $ 80,161,069
                                                          ------------
               Health Care Services - 0.7%
  325,000      Laboratory Corp. of America Holdings*      $ 16,087,500
                                                          ------------
               Managed Health Care - 1.0%
  250,000      CIGNA Corp.                                $ 22,995,000
                                                          ------------
               Total Health Care Equipment & Services     $166,648,141
                                                          ------------
               Pharmaceuticals & Biotechnology - 2.2%
               Pharmaceuticals - 2.2%
1,900,000      IVAX Corp.*                                $ 35,910,000
  934,000      Mylan Laboratories, Inc. (b)                 15,411,000
   42,600      Pfizer, Inc.                                  1,157,442
                                                          ------------
                                                          $ 52,478,442
                                                          ------------
               Total Pharmaceuticals & Biotechnology      $ 52,478,442
                                                          ------------
               Banks - 6.9%
               Regional Banks - 4.6%
  335,000      City National Corp.                        $ 23,617,500
  566,900      KeyCorp                                      18,798,404
  500,000      Marshall & Ilsley Corp.                      21,320,000
  659,700      North Fork Bancorporation, Inc.              18,570,555
   45,910      Washington Banking Co.                          867,699
   54,100      West Coast Bancorp Oregon                     1,106,345
  335,000      Zions Bancorporation                         23,460,050
                                                          ------------
                                                          $107,740,553
                                                          ------------


20   The accompanying notes are an integral part of these financial statements.


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------

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



  Shares                                                       Value
                                                  
              Thrifts & Mortgage Finance - 2.3%
1,175,000     The PMI Group, Inc.                       $ 41,313,000
  554,900     Sovereign Bancorp, Inc.                     11,414,293
                                                        ------------
                                                        $ 52,727,293
                                                        ------------
              Total Banks                               $160,467,846
                                                        ------------
              Diversified Financials - 6.8%
              Consumer Finance - 1.4%
   52,410     White Mountains Insurance Group, Ltd.     $ 32,861,594
                                                        ------------
              Asset Management & Custody Banks - 1.5%
1,225,000     Federated Investors, Inc.                 $ 34,851,250
   41,900     Waddell & Reed Financial, Inc.                 729,479
                                                        ------------
                                                        $ 35,580,729
                                                        ------------
              Consumer Finance - 1.7%
   52,000     MBNA Corp.                                $  1,027,000
2,381,900     Providian Financial Corp.*                  39,706,273
                                                        ------------
                                                        $ 40,733,273
                                                        ------------
              Investment Banking & Brokerage - 2.2%
  838,000     A.G. Edwards, Inc.                        $ 33,276,980
  930,080     Investment Technology Group, Inc.*          17,680,821
                                                        ------------
                                                        $ 50,957,801
                                                        ------------
              Total Diversified Financials              $160,133,397
                                                        ------------
              Insurance - 4.9%
              Insurance Brokers - 2.1%
  798,800     Platinum Underwriter Holdings, Ltd.       $ 23,644,480
  750,000     Willis Group Holdings, Ltd. (b)             25,087,500
                                                        ------------
                                                        $ 48,731,980
                                                        ------------
              Life & Health Insurance - 1.4%
   10,700     Stancorp Financial Group, Inc.            $    818,764
1,850,000     UNUM Corp. (b)                              30,932,000
                                                        ------------
                                                        $ 31,750,764
                                                        ------------
              Property & Casualty Insurance - 1.4%
  150,000     Ambac Financial Group, Inc.               $ 10,027,500
  450,000     Safeco Corp.                                23,701,500
                                                        ------------
                                                        $ 33,729,000
                                                        ------------
              Total Insurance                           $114,211,744
                                                        ------------


The accompanying notes are an integral part of these financial statements.   21


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
SCHEDULE OF INVESTMENTS 4/30/05 (unaudited) (continued)
- --------------------------------------------------------------------------------



   Shares                                                       Value
                                                   
               Software & Services - 3.3%
               Application Software - 1.8%
  675,000      Symantec Corp.*                           $ 12,676,500
1,825,000      Unisys Corp.*                               11,844,250
  850,000      Veritas Software Corp.*                     17,501,500
                                                         ------------
                                                         $ 42,022,250
                                                         ------------
               Data Processing & Outsourced Services - 1.5%
2,400,000      The BISYS Group, Inc.*                    $ 33,888,000
                                                         ------------
               Systems Software - 0.0%
   63,800      WatchGuard Technologies, Inc.*            $    206,712
                                                         ------------
               Total Software & Services                 $ 76,116,962
                                                         ------------
               Technology Hardware & Equipment - 6.1%
               Communications Equipment - 2.5%
1,000,000      Century Telephone Enterprises, Inc.       $ 30,690,000
  475,000      Scientific-Atlanta, Inc.                    14,525,500
1,800,000      Tellabs, Inc.*                              13,968,000
                                                         ------------
                                                         $ 59,183,500
                                                         ------------
               Computer Storage & Peripherals - 2.5%
  900,000      Imation Corp.                             $ 31,383,000
  988,600      Storage Technology Corp.*                   27,483,080
                                                         ------------
                                                         $ 58,866,080
                                                         ------------
               Electronic Equipment & Instruments - 1.1%
  450,000      W.W. Grainger, Inc.                       $ 24,880,500
                                                         ------------
               Total Technology Hardware & Equipment     $142,930,080
                                                         ------------
               Semiconductors - 0.0%
   65,000      Micron Technology, Inc.*                  $    631,150
                                                         ------------
               Total Semiconductors                      $    631,150
                                                         ------------
               Telecommunication Services - 0.1%
               Integrated Telecomunications Services - 0.1%
   37,000      SBC Communications, Inc.                  $    880,600
   26,400      Verizon Communications, Inc.                   945,120
                                                         ------------
                                                         $  1,825,720
                                                         ------------
               Total Telecommunication Services          $  1,825,720
                                                         ------------


22   The accompanying notes are an integral part of these financial statements.


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------

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



     Shares                                                                     Value
                                                                
                   Utilities - 7.7%
                   Electric Utilities - 4.2%
     84,400        Avista Corp.                                        $    1,417,076
    400,000        Edison Intl.                                            14,520,000
    350,000        Entergy Corp.                                           25,655,000
    474,200        NSTAR                                                   25,673,188
    884,800        PG&E Corp.                                              30,720,256
                                                                       --------------
                                                                       $   97,985,520
                                                                       --------------
                   Gas Utilities - 0.4%
    309,200        Atmos Energy Corp.                                  $    8,131,960
                                                                       --------------
                   Independent Power Producer & Energy Traders - 1.9%
    500,000        Constellation Energy Group                          $   26,280,000
    206,200        TXU Corp.                                               17,689,898
                                                                       --------------
                                                                       $   43,969,898
                                                                       --------------
                   Multi-Utilities - 1.2%
  2,850,000        Reliant Energy*(b)                                  $   28,984,500
                                                                       --------------
                   Total Utilities                                     $  179,071,878
                                                                       --------------
                   TOTAL COMMON STOCKS
                   (Cost $1,959,198,510)                               $2,275,435,745
                                                                       --------------

   Principal
     Amount                                                                     Value
                                                                
                   TEMPORARY CASH INVESTMENTS - 8.2%
                   Repurchase Agreement - 3.2%
$73,800,000        UBS Warburg, Inc., 2.85%, dated 4/29/05, repur-
                   chase price of $73,800,000 plus accrued inter-
                   est on 5/2/05 collateralized by $77,010,000
                   U.S. Treasury Note, 3.0%, 2/15/09
                   (Cost $73,800,000)                                  $   73,800,000
                                                                       --------------
                   Security Lending Collateral - 5.0%
116,680,114        Securities Lending Investment Fund, 2.97%           $  116,680,114
                                                                       --------------
                   TOTAL TEMPORARY CASH INVESTMENTS
                   (Cost $190,480,114)                                 $  190,480,114
                                                                       --------------
                   TOTAL INVESTMENTS IN SECURITIES - 105.5%
                   (Cost $2,149,678,623)(a)                            $2,465,915,859
                                                                       --------------
                   OTHER ASSETS AND LIABILITIES - (5.5)%               $ (126,922,616)
                                                                       --------------
                   TOTAL NET ASSETS - 100.0%                           $2,338,993,243
                                                                       ==============


The accompanying notes are an integral part of these financial statements.   23


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
SCHEDULE OF INVESTMENTS 4/30/05 (unaudited) (continued)
- --------------------------------------------------------------------------------

*   Non-income producing security.

(a) At April 31, 2005, the net unrealized gain on investments based on cost for
    federal income tax purposes of $2,151,820,865 was as follows:


                                                                             
       Aggregate gross unrealized gain for all investments in which there is
       an excess of value over tax cost                                         $357,846,020
       Aggregate gross unrealized loss for all investments in which there is
       an excess of tax cost over value                                          (43,751,026)
                                                                                ------------
       Net unrealized gain                                                      $314,094,994
                                                                                ------------


(b)   At April 30, 2005, the following securities were out on loan:



    Shares       Security                                                       Market Value
                                                                          
       68,195     BJ'S Wholesale Club, Inc.*                                    $  1,817,397
    1,948,377     Blockbuster, Inc.                                               19,288,932
      403,115     ConAgra, Inc.                                                   10,783,326
      836,225     Eastman Kodak Co.                                               20,905,625
      449,200     InterActive Corp.*                                               9,765,208
      887,219     Mylan Laboratories, Inc.                                        14,639,114
      866,643     Regal Entertainment Group                                       17,584,186
    1,518,905     Reliant Energy*                                                 15,447,264
       43,030     UNUM Corp.                                                         669,302
       15,000     Willis Group Holdings, Ltd.                                        501,750
                                                                                ------------
                  Total                                                         $111,402,104
                                                                                ============


Purchases and sales of securities (excluding temporary cash investments) for
the six months ended April 30, 2005 aggregated $772,046,976 and $546,813,566,
respectively.

24   The accompanying notes are an integral part of these financial statements.


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
STATEMENT OF ASSETS AND LIABILITIES 4/30/05 (unaudited)
- --------------------------------------------------------------------------------


                                                            
ASSETS:
  Investment in securities (including securities loaned of
    $111,402,104) (cost $2,149,678,623)                        $2,465,915,859
  Cash                                                                421,385
  Receivables -
    Investment securities sold                                     10,502,719
    Fund shares sold                                                8,002,914
    Dividends, interest and foreign taxes withheld                  1,255,886
  Other                                                                15,727
                                                               --------------
      Total assets                                             $2,486,114,490
                                                               --------------
LIABILITIES:
  Payables -
    Investment securities purchased                            $   23,313,925
    Fund shares repurchased                                         4,458,786
    Upon return of securities loaned                              116,680,114
  Due to affiliates                                                 2,518,253
  Accrued expenses                                                    150,169
                                                               --------------
      Total liabilities                                        $  147,121,247
                                                               --------------
NET ASSETS:
  Paid-in capital                                              $1,853,353,474
  Accumulated net investment loss                                    (772,242)
  Accumulated net realized gain on investments                    170,174,775
  Net unrealized gain on investments                              316,237,236
                                                               --------------
      Total net assets                                         $2,338,993,243
                                                               ==============
NET ASSET VALUE PER SHARE:
(No par value, Unlimited number of shares authorized)
  Class A (based on $1,828,159,026/75,144,668 shares)          $        24.33
                                                               ==============
  Class B (based on $201,539,311/9,247,744 shares)             $        21.79
                                                               ==============
  Class C (based on $136,145,955/6,295,588 shares)             $        21.63
                                                               ==============
  Investor Class (based on $66,852,120/2,746,048 shares)       $        24.34
                                                               ==============
  Class R (based on $8,009,112/330,980 shares)                 $        24.20
                                                               ==============
  Class Y (based on $98,287,719/3,918,684 shares)              $        25.08
                                                               ==============
MAXIMUM OFFERING PRICE:
  Class A ($24.33 [divided by] 94.25%)                         $        25.81
                                                               ==============


The accompanying notes are an integral part of these financial statements.   25


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
STATEMENT OF OPERATIONS (unaudited)
- --------------------------------------------------------------------------------
For the Six Months Ended 4/30/05


                                                                      
INVESTMENT INCOME:
  Dividends (net of foreign taxes withheld of $20,645)     $12,383,236
  Interest                                                     661,015
  Income from securities loaned, net                           102,356
                                                           -----------
      Total investment income                                               $ 13,146,607
                                                                            ------------
EXPENSES:
  Management fees
    Basic Fee                                              $ 7,044,998
    Performance Adjustment                                     282,659
  Transfer agent fees and expenses
    Class A                                                  1,508,991
    Class B                                                    390,491
    Class C                                                    169,395
    Investor Class                                              78,418
    Class R                                                      1,310
    Class Y                                                        306
  Distribution fees
    Class A                                                  2,059,021
    Class B                                                  1,080,283
    Class C                                                    632,432
    Class R                                                     14,184
  Administrative reimbursements                                201,602
  Custodian fees                                                52,893
  Registration fees                                            209,159
  Professional fees                                             47,779
  Printing expense                                             117,923
  Fees and expenses of nonaffiliated trustees                   22,196
  Miscellaneous                                                 32,959
                                                           -----------
      Total expenses                                                        $ 13,946,999
      Less fees paid indirectly                                                  (28,150)
                                                                            ------------
      Net expenses                                                          $ 13,918,849
                                                                            ------------
       Net investment loss                                                  $   (772,242)
                                                                            ------------
REALIZED AND UNREALIZED GAIN (LOSS)
ON INVESTMENTS:
  Net realized gain on investments                                          $172,326,441
                                                                            ------------
  Change in net unrealized gain on investments                              $(26,270,885)
                                                                            ------------
    Net gain on investments                                                 $146,055,556
                                                                            ------------
    Net increase in net assets resulting from operations                    $145,283,314
                                                                            ============


26   The accompanying notes are an integral part of these financial statements.


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
STATEMENTS OF CHANGES IN NET ASSETS
- --------------------------------------------------------------------------------
For the Six Months Ended 4/30/05 and the Year Ended 10/31/04



                                                          Six Months
                                                             Ended              Year
                                                            4/30/05             Ended
                                                          (unaudited)         10/31/04
                                                                     
FROM OPERATIONS:
Net investment loss                                     $     (772,242)    $   (1,976,878)
Net realized gain on investments                           172,326,441        246,396,005
Change in net unrealized gain (loss) on investments        (26,270,885)        24,101,697
                                                        --------------     --------------
    Net increase in net assets resulting from
     operations                                         $  145,283,314     $  268,520,824
                                                        --------------     --------------
DISTRIBUTIONS TO SHAREOWNERS:
Net realized gain:
  Class A ($3.16 and $0.52 per share, respectively)     $ (192,323,613)    $  (28,487,287)
  Class B ($3.16 and $0.49 per share, respectively)        (28,484,916)        (5,806,720)
  Class C ($3.16 and $0.49 per share, respectively)        (15,255,111)        (1,376,991)
  Class R ($3.16 and $0.59 per share, respectively)           (432,320)            (9,104)
  Class Y ($3.16 and $0.60 per share, respectively)         (6,412,542)          (222,150)
                                                        --------------     --------------
    Total distributions to shareowners                  $ (242,908,502)    $  (35,902,252)
                                                        --------------     --------------
FROM FUND SHARE TRANSACTIONS:
Net proceeds from sale of shares                        $  451,297,831     $  515,669,882
Shares issued in reorganization                             74,855,245                  -
Reinvestment of distributions                              206,087,363         31,599,105
Cost of shares repurchased                                (211,418,526)      (376,087,240)
                                                        --------------     --------------
  Net increase in net assets resulting from
    Fund share transactions                             $  520,821,913     $  171,181,747
                                                        --------------     --------------
  Net increase in net assets                            $  423,196,725     $  403,800,319
NET ASSETS:
Beginning of period                                      1,915,796,518      1,511,996,199
                                                        --------------     --------------
End of period (including accumulated net investment
  loss of ($772,242) and $0, respectively)              $2,338,993,243     $1,915,796,518
                                                        ==============     ==============


The accompanying notes are an integral part of these financial statements.   27


Pioneer Mid Cap Value Fund
- -----------------------------------------------------------------------------
STATEMENTS OF CHANGES IN NET ASSETS                                (continued)
- -----------------------------------------------------------------------------
For the Six Months Ended 4/30/05 and the Year Ended 10/31/04



                                   '05 Shares       '05 Amount
                                  (unaudited)      (unaudited)       '04 Shares      '04 Amount
                                                                        
CLASS A
Shares sold                        13,201,658     $ 327,837,281      14,807,485     $ 358,418,447
Reinvestment of distributions       7,034,381       166,926,274       1,148,882        25,351,846
Less shares repurchased            (5,619,518)     (139,034,686)     (9,746,158)     (233,994,444)
                                   ----------     -------------      ----------     -------------
    Net increase                   14,616,521     $ 355,728,869       6,210,209     $ 149,775,849
                                   ==========     =============      ==========     =============
CLASS B
Shares sold                         1,185,980     $  26,506,574       2,425,751     $  53,361,606
Reinvestment of distributions       1,171,560        25,013,108         245,157         4,957,085
Less shares repurchased            (2,067,101)      (45,868,999)     (5,494,026)     (122,138,709)
                                   ----------     -------------      ----------     -------------
    Net increase (decrease)           290,439     $   5,650,683      (2,823,118)    $ (63,820,018)
                                   ==========     =============      ==========     =============
CLASS C
Shares sold                         1,840,648     $  40,829,549       2,672,746     $  58,567,505
Reinvestment of distributions         560,391        11,869,083          53,189         1,068,044
Less shares repurchased              (674,601)      (14,819,661)       (810,887)      (17,714,083)
                                   ----------     -------------      ----------     -------------
    Net increase                    1,726,438     $  37,878,971       1,915,048     $  41,921,466
                                   ==========     =============      ==========     =============
INVESTOR CLASS
Shares sold                            10,746     $     258,165
Shares issued in
  reorganization                    3,118,969        74,855,245
Less shares repurchased              (383,667)       (9,461,229)
                                   ----------     -------------
    Net increase                    2,746,048     $  65,652,181
                                   ==========     =============
CLASS R
Shares sold                           216,883     $   5,300,773         177,122     $   4,286,805
Reinvestment of distributions          15,506           366,263             410             9,087
Less shares repurchased               (29,860)         (734,606)        (50,857)       (1,225,525)
                                   ----------     -------------      ----------     -------------
    Net increase                      202,529     $   4,932,430         126,675     $   3,070,367
                                   ==========     =============      ==========     =============
CLASS Y
Shares sold                         1,985,626     $  50,565,489       1,580,743     $  41,035,519
Reinvestment of distributions          78,322         1,912,635           9,409           213,043
Less shares repurchased               (58,587)       (1,499,345)        (40,273)       (1,014,479)
                                   ----------     -------------      ----------     -------------
    Net increase                    2,005,361     $  50,978,779       1,549,879     $  40,234,083
                                   ==========     =============      ==========     =============


28    The accompanying notes are an integral part of these financial statements.


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------



                                                        Six Months
                                                          Ended
                                                         4/30/05      Year Ended   Year Ended    Year Ended  Year Ended   Year Ended
CLASS A                                                 (unaudited)    10/31/04     10/31/03      10/31/02    10/31/01     10/31/00
                                                                                                         
Net asset value, beginning of period                    $   25.57     $    22.25   $    16.93    $  19.29     $  20.83    $  19.90
                                                        ---------     ----------   ----------    --------     --------    --------
Increase (decrease) from investment operations:
 Net investment income (loss)                           $    0.01     $     0.01   $     0.04    $  (0.02)    $  (0.01)   $   0.11
 Net realized and unrealized gain (loss) on investments      1.91           3.83         5.28       (0.97)        0.34        3.46
                                                        ---------     ----------   ----------    --------     --------    --------
   Net increase (decrease) from investment operations   $    1.92     $     3.84   $     5.32    $  (0.99)    $   0.33    $   3.57
Distributions to shareowners:
 Net realized gain                                          (3.16)         (0.52)           -       (1.37)       (1.87)      (2.64)
                                                        ---------     ----------   ----------    --------     --------    --------
Net increase (decrease) in net asset value              $   (1.24)    $     3.32   $     5.32    $  (2.36)    $  (1.54)   $   0.93
                                                        ---------     ----------   ----------    --------     --------    --------
Net asset value, end of period                          $   24.33     $    25.57   $    22.25    $  16.93     $  19.29    $  20.83
                                                        =========     ==========   ==========    ========     ========    ========
Total return*                                                7.81%         17.65%       31.42%      (5.99)%       1.85%      20.00%
Ratio of net expenses to average net assets+                 1.16%**        1.21%        1.37%       1.30%        1.24%       1.13%
Ratio of net investment income (loss) to average
 net assets+                                                 0.06%**        0.05%        0.24%      (0.09)%       0.01%       0.27%
Portfolio turnover rate                                        52%**          59%          58%         65%          95%         70%
Net assets, end of period (in thousands)                $1,828,159    $1,547,823   $1,208,400    $890,856     $921,310    $945,583
Ratios with reduction for fees paid indirectly:
 Net expenses                                                1.16%**        1.21%        1.37%       1.30%        1.22%       1.11%
 Net investment income (loss)                                0.06%**        0.05%        0.24%      (0.09)%       0.03%       0.29%


 *  Assumes initial investment at net asset value at the beginning of each
    period, reinvestment of all distributions, the complete redemption of the
    investment at net asset value at the end of each period, and no sales
    charges. Total return would be reduced if sales charges were taken into
    account.
**  Annualized
+   Ratios with no reduction for fees paid indirectly.

   The accompanying notes are an integral part of these financial statements.

                                                                              29


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------



                                                        Six Months
                                                          Ended
                                                         4/30/05      Year Ended   Year Ended   Year Ended   Year Ended   Year Ended
CLASS B                                                 (unaudited)    10/31/04     10/31/03     10/31/02     10/31/01     10/31/00
                                                                                                         
Net asset value, beginning of period                    $   23.32       $ 20.48    $  15.72     $  18.14     $  19.85     $  19.22
                                                        ---------       -------    --------     --------     --------     --------
Increase (decrease) from investment operations:
 Net investment loss                                    $   (0.10)      $ (0.22)   $  (0.13)    $  (0.18)    $  (0.10)    $  (0.20)
 Net realized and unrealized gain (loss) on investments      1.73          3.55        4.89        (0.87)        0.26         3.47
                                                        ---------       -------    --------     --------     --------     --------
   Net increase (decrease) from investment operations   $    1.63       $  3.33    $   4.76     $  (1.05)    $   0.16     $   3.27
Distributions to shareowners:
 Net realized gain                                          (3.16)        (0.49)          -        (1.37)       (1.87)       (2.64)
                                                        ---------       -------    --------     --------     --------     --------
Net increase (decrease) in net asset value              $   (1.53)      $  2.84    $   4.76     $  (2.42)    $  (1.71)    $   0.63
                                                        ---------       -------    --------     --------     --------     --------
Net asset value, end of period                          $   21.79       $ 23.32    $  20.48     $  15.72     $  18.14     $  19.85
                                                        =========       ========   ========     ========     ========     ========
Total return*                                                7.26%        16.64%      30.28%       (6.75)%       1.01%       19.04%
Ratio of net expenses to average net assets+                 2.10%**       2.13%       2.22%        2.10%        2.03%        1.91%
Ratio of net investment loss to average net assets+         (0.88)%**     (0.86)%     (0.61)%      (0.89)%      (0.78)%      (0.52)%
Portfolio turnover rate                                        52%**         59%         58%          65%          95%          70%
Net assets, end of period (in thousands)                $ 201,539       $208,844   $241,313     $264,881     $330,926     $336,301
Ratios with reduction for fees paid indirectly:
 Net expenses                                                2.10%**       2.13%       2.22%        2.10%        2.01%        1.90%
 Net investment loss                                        (0.88)%**     (0.86)%     (0.61)%      (0.89)%      (0.76)%      (0.51)%


 *  Assumes initial investment at net asset value at the beginning of each
    period, reinvestment of all distributions, the complete redemption of the
    investment at net asset value at the end of each period, and no sales
    charges. Total return would be reduced if sales charges were taken into
    account.
**  Annualized
+   Ratios with no reduction for fees paid indirectly.

   The accompanying notes are an integral part of these financial statements.

30


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------



                                                          Six Months
                                                            Ended
                                                           4/30/05     Year Ended  Year Ended  Year Ended   Year Ended   Year Ended
CLASS C                                                  (unaudited)    10/31/04    10/31/03    10/31/02     10/31/01     10/31/00
                                                                                                         
Net asset value, beginning of period                     $   23.15      $  20.34     $ 15.61     $ 18.04      $ 19.76      $ 19.16
                                                         ---------      --------     -------     -------      -------      -------
Increase (decrease) from investment operations:
 Net investment income (loss)                            $   (0.07)     $  (0.16)    $ (0.10)    $ (0.16)     $  0.03      $ (0.26)
 Net realized and unrealized gain (loss) on investments       1.71          3.46        4.83       (0.90)        0.12         3.50
                                                         ---------      --------     -------     -------      -------      -------
 Net increase (decrease) from investment operations      $    1.64      $   3.30     $  4.73     $ (1.06)     $  0.15      $  3.24
Distributions to shareowners:
 Net realized gain                                           (3.16)        (0.49)          -       (1.37)       (1.87)       (2.64)
                                                         ---------      --------     -------     -------      -------      -------
Net increase (decrease) in net asset value               $   (1.52)     $   2.81     $  4.73     $ (2.43)     $ (1.72)     $  0.60
                                                         ---------      --------     -------     -------      -------      -------
Net asset value, end of period                           $   21.63      $  23.15     $ 20.34     $ 15.61      $ 18.04      $ 19.76
                                                         =========      ========     =======     =======      =======      =======
Total return*                                                 7.36%        16.60%      30.30%      (6.85)%       0.96%       18.92%
Ratio of net expenses to average net assets+                  2.00%**       2.11%       2.28%       2.20%        2.11%        2.01%
Ratio of net investment loss to average net assets+          (0.79)%**     (0.88)%     (0.68)%     (0.99)%      (0.86)%      (0.61)%
Portfolio turnover rate                                         52%**         59%         58%         65%          95%          70%
Net assets, end of period (in thousands)                 $ 136,146      $105,778     $53,982     $34,605      $29,547      $24,495
Ratios with reduction for fees paid indirectly:
 Net expenses                                                 2.00%**       2.11%       2.28%       2.20%        2.09%        1.98%
 Net investment loss                                         (0.79)%**     (0.88)%     (0.68)%     (0.99)%      (0.84)%      (0.58)%


 *  Assumes initial investment at net asset value at the beginning of each
    period, reinvestment of all distributions, the complete redemption of the
    investment at net asset value at the end of each period, and no sales
    charges. Total return would be reduced if sales charges were taken into
    account.
**  Annualized
+   Ratios with no reduction for fees paid indirectly.

   The accompanying notes are an integral part of these financial statements.

                                                                              31


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------



                                                   Six Months
                                                      Ended
                                                     4/30/05      Year Ended    4/1/03 (a) to
CLASS R                                            (unaudited)     10/31/04       10/31/03
                                                                          
Net asset value, beginning of period                 $25.46         $22.25         $16.81
                                                     ------         ------         ------
Increase from investment operations:
  Net investment income (loss)                       $(0.01)        $ 0.06         $    -
  Net realized and unrealized gain on
   investments                                         1.91           3.74           5.44
                                                     ------         ------         ------
   Net increase from investment operations           $ 1.90         $ 3.80         $ 5.44
Distributions to shareowners:
  Net realized gain                                   (3.16)         (0.59)             -
                                                     ------         ------         ------
Net increase (decrease)                              $(1.26)        $ 3.21         $ 5.44
                                                     ------         ------         ------
Net asset value, end of period                       $24.20         $25.46         $22.25
                                                     ======         ======         ======
Total return*                                          7.76%         17.50%         32.36%
Ratio of net expenses to average net assets+           1.30%**        1.34%          1.31%**
Ratio of net investment loss to average
  net assets+                                         (0.11)%**      (0.16)%        (0.08)%**
Portfolio turnover rate                                  52%**          59%            58%
Net assets, end of period (in thousands)             $8,009         $3,271         $   40
Ratios with reduction for fees paid indirectly:
  Net expenses                                         1.30%**        1.34%          1.31%**
  Net investment loss                                 (0.11)%**      (0.16)%        (0.08)%**


(a) Class R shares were first publicly offered on April 1, 2003.
 *  Assumes initial investment at net asset value at the beginning of each
    period, reinvestment of all distributions, and the complete redemption of
    the investment at net asset value at the end of each period.
**  Annualized
+   Ratios with no reduction for fees paid indirectly.

32    The accompanying notes are an integral part of these financial statements.


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------



                                                         Six Months
                                                            Ended
                                                           4/30/05    Year Ended    Year Ended  Year Ended   Year Ended   Year Ended
CLASS Y                                                  (unaudited)   10/31/04      10/31/03    10/31/02     10/31/01     10/31/00
                                                                                                          
Net asset value, beginning of period                      $ 26.17       $ 22.73      $  17.21     $ 19.50      $ 20.94      $ 19.91
                                                          -------       -------      --------     -------      -------      -------
Increase (decrease) from investment operations:
 Net investment income                                    $  0.04       $  0.08      $   0.15     $  0.06      $  0.07      $  0.20
 Net realized and unrealized gain (loss) on investments      2.03          3.96          5.37       (0.98)        0.36         3.47
                                                          -------       -------      --------     -------      -------      -------
  Net increase (decrease) from investment operations      $  2.07       $  4.04      $   5.52     $ (0.92)     $  0.43      $  3.67
Distributions to shareowners:
 Net realized gain                                          (3.16)        (0.60)            -       (1.37)       (1.87)       (2.64)
                                                          -------       -------      --------     -------      -------      -------
Net increase (decrease) in net asset value                $ (1.09)      $  3.44      $   5.52     $ (2.29)     $ (1.44)     $  1.03
                                                          -------       -------      --------     -------      -------      -------
Net asset value, end of period                            $ 25.08       $ 26.17      $  22.73     $ 17.21      $ 19.50      $ 20.94
                                                         ========       =======      ========     =======      =======      =======
Total return*                                                8.22%        18.23%        32.07%      (5.54)%       2.36%       20.56%
Ratio of net expenses to average net assets+                 0.74%**       0.78%         0.84%       0.84%        0.76%        0.63%
Ratio of net investment income to average net assets+        0.46%**       0.46%         0.76%       0.37%        0.49%        0.77%
Portfolio turnover rate                                        52%**         59%           58%         65%          95%          70%
Net assets, end of period (in thousands)                  $98,288       $50,081      $  8,261     $ 6,318      $ 3,642      $ 3,376
Ratios with reduction for fees paid indirectly:
 Net expenses                                                0.74%**       0.78%         0.84%       0.83%        0.75%        0.61%
 Net investment income                                       0.46%**       0.46%         0.76%       0.38%        0.50%        0.79%


 *  Assumes initial investment at net asset value at the beginning of each
    period, reinvestment of all distributions, and the complete redemption of
    the investment at net asset value at the end of each period.
**  Annualized
+   Ratios with no reduction for fees paid indirectly.

  The accompanying notes are an integral part of these financial statements.

                                                                              33


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------



                                                           12/10/04 to
                                                             4/30/05
INVESTOR CLASS                                             (unaudited)
                                                       
Net asset value, beginning of period                        $ 24.00
                                                            -------
Increase from investment operations:
  Net investment income                                     $     -
  Net realized and unrealized gain on investments              0.34
                                                            -------
   Net increase from investment operations                  $  0.34
                                                            -------
Net increase in net asset value                             $  0.34
                                                            -------
Net asset value, end of period                              $ 24.34
                                                            =======
Total return*                                                  1.42%
Ratio of net expenses to average net assets+                   1.01%**
Ratio of net investment income to average net assets+          0.02%**
Portfolio turnover rate                                          52%**
Net assets, end of period (in thousands)                    $66,852
Ratios with reduction for fees paid indirectly:
  Net expenses                                                 1.01%**
  Net investment income                                        0.02%**


 *  Assumes initial investment at net asset value at the beginning of each
    period, reinvestment of all distributions, and the complete redemption of
    the investment at net asset value at the end of each period.
**  Annualized
+   Ratios with no reduction for fees paid indirectly.

34    The accompanying notes are an integral part of these financial statements.


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
NOTES TO FINANCIAL STATEMENTS 4/30/05 (unaudited)
- --------------------------------------------------------------------------------

1. Organization and Significant Accounting Policies
Pioneer Mid Cap Value Fund (the Fund) is a Delaware statutory trust registered
under the Investment Company Act of 1940 as a diversified, open-end management
investment company. The investment objective of the Fund is to seek capital
appreciation by investing in a diversified portfolio of securities consisting
primarily of common stocks.

The Trustees have authorized the issuance of six classes of shares of the Fund.
The fund offers six classes of shares designated as Class A, Class B, Class C,
Investor Class, Class R and Class Y shares. Investor class shares were first
issued on December 10, 2004. The Fund is not offering additional Investor Class
shares except in connection with the reinvestment of dividends on the Fund's
outstanding Investor Class shares. Each class of shares represents an interest
in the same portfolio of investments of the fund and have equal rights to
voting, redemptions, dividends and liquidations, except that each class of
shares can bear different transfer agent and distribution fees and has
exclusive voting rights with respect to the distribution plans that have been
adopted by Class A, Class B, Class C and class R shareowners, respectively.
There is no distribution plan for Investor Class or Class Y shareowners.

The Fund's financial statements have been prepared in conformity with U.S
generally accepted accounting principles that require the management of the
Fund to, among other things, make estimates and assumptions that affect the
reported amounts of assets and liabilities, the disclosure of contingent assets
and liabilities at the date of the financial statements, and the reported
amounts of income, expenses and gains and losses on investments during the
reporting year. Actual results could differ from those estimates. The following
is a summary of significant accounting policies followed by the Fund in the
preparation of its financial statements, which are consistent with those
policies generally accepted in the investment company industry:

A.  Security Valuation

    Security transactions are recorded as of trade date. The net asset value
    of the Fund is computed once daily, on each day the New York Stock
    Exchange (NYSE) is open, as of the close of regular trading on the NYSE.
    In computing the net asset value, securities are valued at the last sale
    price on the principal exchange where they are traded. Securities that
    have not traded on the date of

                                                                              35


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
NOTES TO FINANCIAL STATEMENTS 4/30/05 (unaudited)                    (continued)
- --------------------------------------------------------------------------------

    valuation, or securities for which sale prices are not generally reported,
    are valued at the mean between the last bid and asked prices. Securities
    for which market quotations are not readily available are valued at their
    fair values as determined by, or under the direction of, the Board of
    Trustees. Trading in foreign securities is substantially completed each
    day at various times prior to the close of the NYSE. The values of such
    securities used in computing the net asset value of the Fund's shares are
    determined as of such times. The Fund also may use the fair value of a
    security, including a non-U.S. security, when the closing market price on
    the principal exchange where the security is traded no longer reflects the
    value of the security. At April 30, 2005 there were no securities fair
    valued. Temporary cash investments are valued at amortized cost.

    Dividend income is recorded on the ex-dividend date except that certain
    dividends from foreign securities where the ex dividend date may have
    passed are recorded as soon as the Fund becomes aware of the ex-dividend
    data in exercise of reasonable diligence. Dividend and interest income is
    recorded on the accrual basis, net of unrecoverable foreign taxes withheld
    at the applicable country rates.

    Gains and losses on sales of investments are calculated on the identified
    cost method for both financial reporting and federal income tax purposes.

B.  Federal Income Taxes

    It is the Fund's policy to comply with the requirements of the Internal
    Revenue Code applicable to regulated investment companies and to
    distribute all of its taxable income and net realized capital gains, if
    any, to its shareowners. Therefore, no federal income tax provision is
    required.

    The amounts and characterizations of distributions to shareowners for
    financial reporting purposes are determined in accordance with federal
    income tax rules. Therefore, the sources of the Fund's distributions may
    be shown in the accompanying financial statements as either from or in
    excess of net investment income or net realized gain on investment
    transactions, or from paid-in capital, depending on the type of book/tax
    differences that may exist.

36


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------

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

  The tax character of current year distributions will be determined at the
  end of the fiscal year. The tax character of distributions paid during the
  year ended October 31, 2004 was as follows:



- --------------------------------------------------------------------------------
                                                                       2004
- --------------------------------------------------------------------------------
                                                                
  Distributions paid from:
   Ordinary Income                                                 $14,085,382
   Long-Term capital gain                                           21,816,870
                                                                   -----------
    Total                                                          $35,902,252
                                                                   ===========
- --------------------------------------------------------------------------------


  The following shows the components of distributable earnings on a federal
  income tax basis at October 31, 2004 :



- --------------------------------------------------------------------------------
                                                                       2004
- --------------------------------------------------------------------------------
                                                               
  Undistributed ordinary income                                   $ 14,063,274
  Undistributed long-term gain                                     228,835,803
  Unrealized appreciation                                          325,576,037
                                                                  ------------
   Total                                                          $568,475,114
                                                                  ------------
- --------------------------------------------------------------------------------


    The difference between book basis and tax-basis unrealized appre
    ciation is attributable to the tax deferral of losses on wash sales.

C.  Fund Shares

    The Fund records sales and repurchases of its shares as of trade date.
    Pioneer Funds Distributor, Inc. (PFD), the principal underwriter for the
    Fund and a wholly owned indirect subsidiary of UniCredito Italiano S.p.A.
    (UniCredito Italiano), earned approximately $258,431 in underwriting
    commissions on the sale of Class A shares during the six months ended
    April 30, 2005.

D.  Class Allocations

    Distribution fees are calculated based on the average daily net asset
    value attributable to Class A, Class B, Class C, and Class R shares of the
    Fund, respectively (see Note 4). Investor Class and Class Y shares are not
    subject to a distribution plan. Shareowners of each class share all
    expenses and fees paid to the transfer agent, Pioneer Investment
    Management Shareholder Services, Inc. (PIMSS), for its services, which are
    allocated based on the number of accounts in each class and the ratable
    allocation of related out-of-pocket expenses (see Note 3). Income, common
    expenses and

                                                                              37


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
NOTES TO FINANCIAL STATEMENTS 4/30/05 (unaudited)                    (continued)
- --------------------------------------------------------------------------------

    realized and unrealized gains and losses are calculated at the Fund level
    and allocated daily to each class of shares based on the respective
    percentage of adjusted net assets at the beginning of the day.

    Distributions to shareowners are recorded as of the ex-dividend date.
    Distributions paid by the Fund with respect to each class of shares are
    calculated in the same manner, at the same time, on the same day, and in
    the same amount, except that Class A, Class B, Class C, Class R and Class
    Y shares can bear different transfer agent and distribution fees.

E.  Securities Lending

    The Fund lends securities in its Portfolio to certain broker-dealers or
    other institutional investors, with the Fund's custodian acting as the
    lending agent. When entering into a loan, the Fund receives collateral,
    which is maintained by the custodian and earns income in the form of
    negotiated lenders' fees. The Fund also continues to receive interest or
    payments in lieu of dividends on the securities loaned. Gain or loss on
    the fair value of the loaned securities that may occur during the term of
    the loan will be for the account of the Fund. The loans are secured by
    collateral of at least 102%, at all times, of the fair value of the
    securities loaned. The amount of the collateral will be adjusted daily to
    reflect any price fluctuation in the value of the loaned securities. The
    Fund has the right under the lending agreements to recover the securities
    on loan from the borrower on demand. The Fund invests cash collateral in
    the Securities Lending Investment Fund, which is managed by Brown Brothers
    Harriman & Co., the Fund's custodian.

F.  Repurchase Agreements

    With respect to repurchase agreements entered into by the Fund, the value
    of the underlying securities (collateral), including accrued interest
    received from counterparties, is required to be at least equal to or in
    excess of the value of the repurchase agreement at the time of purchase.
    The collateral for all repurchase agreements is held in safekeeping in the
    customer-only account of the Fund's custodian, or subcustodians. The
    Fund's investment adviser, Pioneer Investment Management, Inc. (PIM), is
    responsible for determining that the value of the collateral remains at
    least equal to the repurchase price.

38


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------

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

G. Option writing

    When the Fund writes an option, an amount equal to the premium received by
    the Fund is recorded as a liability and is subsequently adjusted to the
    current fair value of the option written. Premiums received from writing
    options that expire unexercised are treated by the Fund on the expiration
    date as realized gains from investments. The difference between the
    premium and the amount paid on effecting a closing purchase transaction,
    including brokerage commissions, is also treated as a realized gain, or,
    if the premium is less than the amount paid for the closing purchase
    transaction, as a realized loss. If a call option is exercised, the
    premium is added to the proceeds from the sale of the underlying security
    or currency in determining whether the Fund has realized a gain or loss.
    The Fund as writer of an option bears the market risk of an unfavorable
    change in the price of the security underlying the written option.

    During the period, the Fund did not write or exercise any option
    contracts.

2. Management Agreement

PIM, a wholly owned indirect subsidiary of UniCredito Italiano, manages the
Fund's portfolio. PIM receives a basic fee that is calculated at the annual
rate of 0.70% of the Fund's average daily net assets up to $500 million; 0.65%
of the next $500 million; and 0.625% of the excess over $1 billion. The basic
fee is subject to a performance adjustment up to a maximum of +/-0.10% based on
the Fund's investment performance as compared with the Russell Midcap Value
Index over a rolling 36-month period. In addition, the fee is further limited
to a maximum annualized rate adjustment of +/-0.10% (a "ceiling" and a "floor").
Effective August 1, 2004 PIM commenced a voluntary waiver of the minimum fee
provision (the "floor"), but may reimpose it in the future. Pursuant to a
shareowner vote on April 17, 2003 the benchmark was changed from the Lipper
Growth Funds Index effective May 1, 2003; however the Lipper Growth Funds Index
will be used for monthly periods prior to May 1, 2003 until it is eventually
phased out. For the six months ended April 30, 2005, the aggregate performance
adjustment resulted in an increase to the basic fee of $282,659. The management
fee was equivalent to 0.67% of the average daily net assets for the period.

                                                                              39


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
NOTES TO FINANCIAL STATEMENTS 4/30/05 (unaudited)                    (continued)
- --------------------------------------------------------------------------------

In addition, under the management and administration agreements, certain other
services and costs, including accounting, regulatory reporting and insurance
premiums, are paid by the Fund. On April 30, 2005, $1,230,232 was payable to
PIM related to management fees, administrative costs and certain others
services, and is included in due to affiliates.

3. Transfer Agent

PIMSS, a wholly owned indirect subsidiary of UniCredito Italiano, provides
substantially all transfer agent and shareowner services to the Fund at
negotiated rates. Included in due to affiliates is $668,119 in transfer agent
fees payable to PIMSS at April 30, 2005.

4. Distribution and Service Plans

The Fund adopted a plan of Distribution with respect to Class A, Class B, Class
C and Class R shares (Class A Plan, Class B Plan, Class C Plan and Class R
Plan) in accordance with Rule 12b-1 of the Investment Company Act of 1940.
Pursuant to the Class A Plan, the Fund pays PFD a service fee of up to 0.25% of
the average daily net assets attributable to Class A shares in reimbursement of
its actual expenditures to finance activities primarily intended to result in
the sale of Class A shares. Pursuant to the Class B Plan and the Class C Plan,
the Fund pays PFD 1.00% of the average daily net assets attributable to each
class of shares. The fee consists of a 0.25% service fee and a 0.75%
distribution fee paid as compensation for personal services and/or account
maintenance services or distribution services with regard to Class B and Class
C shares. Pursuant to the Class R Plan, the Fund pays PFD 0.50% of the average
daily net assets attributable to Class R shares for distribution services.
Included in due to affiliates is $619,902 in distribution fees payable to PFD
at April 30, 2005. The Fund also has adopted a separate service plan for Class
R shares (Service Plan). The Service Plan authorizes the Fund to pay securities
dealers, plan administrators or other service organizations that agree to
provide certain services to retirement plans or plan participants holding
shares of the Fund a service fee of up to 0.25% of the Fund's average daily net
assets attributable to Class R shares held by such plans.

In addition, redemptions of each class of shares (except Class Y shares) may be
subject to a contingent deferred sales charge (CDSC). Effective February 1,
2004, a CDSC of 1.00% may be imposed on

40


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------

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

redemptions of certain of net asset value purchases of Class A shares within 18
months of purchase (12 months for shares purchased prior to February 1, 2004).
Class B shares subscribed on or after December 1, 2004 that are redeemed within
five years of purchase are subject to a CDSC at declining rates beginning at
4.00%, based on the lower of cost or market value of shares being redeemed.
Redemptions of Class C shares within one year of purchase are subject to a CDSC
of 1.00%. Redemptions of Class R shares within 18 months of purchase were
subject to a CDSC of 1.00%. Effective July 1, 2004, the CDSC on Class R shares
was eliminated. Proceeds from the CDSCs are paid to PFD. For the six months
ended April 30, 2005, CDSCs in the amount of $123,563 were paid to PFD.

5. Directed Brokerage and Expense Offset Arrangements

The Fund has entered into directed brokerage arrangements with brokers with
whom PIM places trades on behalf of the Fund where they provide services to the
Fund in addition to trade execution. These services included payments of
certain expenses on behalf of the Fund. For the six months ended April 30,
2005, the Fund's expenses were not reduced under this agreement. In addition,
the Fund has entered into certain expense offset arrangements with PIMSS
resulting in a reduction in the Fund's total expenses due to interest earned on
cash held by PIMSS. For the six months ended April 30, 2005, the Fund's
expenses were reduced by $28,150 under such arrangements.

6. Line of Credit Facility

The Fund, along with certain other funds in the Pioneer Family of Funds (the
Funds), collectively participate in a $50 million committed, unsecured
revolving line of credit facility. Borrowings are used solely for temporary or
emergency purposes. The Fund may borrow up to the lesser of $50 million or the
limits set by its prospectus for borrowings. Interest on collective borrowings
is payable at the Federal Funds Rate plus 1/2% on an annualized basis. The
Funds pay an annual commitment fee for this facility. The commitment fee is
allocated among such Funds based on their respective borrowing limits. For the
six months ended April 30, 2005, the Fund had no borrowings under this
agreement.

                                                                              41


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
NOTES TO FINANCIAL STATEMENTS 4/30/05 (unaudited)                    (continued)
- --------------------------------------------------------------------------------

7. Merger Information

On December 8, 2004, beneficial owners of Safeco Multi-Cap Core Fund (one of
the Series that comprised Safeco Common Stock Trust) approved a proposed
Agreement and Plan of Reorganization that provided for the merger listed below.
This tax-free reorganization was accomplished on December 10, 2004, by
exchanging all of Safeco's net assets for Investor Class shares, based on the
Fund's Class A shares' ending net asset value. The following charts show the
details of the reorganizations as of that closing date ("Closing Date"):



- ----------------------------------------------------------------------------------------------
                        Pioneer Mid Cap         Safeco Multi-Cap          Pioneer Mid Cap
                          Value Fund                Core Fund               Value Fund
                     (Pre-Reorganization)     (Pre-Reorganization)     (Post-Reorganization)
- ----------------------------------------------------------------------------------------------
                                                                 
  Net Assets           $2,043,704,410              $74,855,245            $2,118,559,655

  Shares
  Outstanding              86,855,098                3,678,154                89,974,067

  Investor Class
  Shares Issued                                                                3,118,969
- ----------------------------------------------------------------------------------------------




- ----------------------------------------------------------------------------------------------
                                                   Unrealized                Accumulated
                                                 Appreciation on               Gain on
                                                  Closing Date               Closing Date
- ----------------------------------------------------------------------------------------------
                                               
  Safeco Multi-Cap Core Fund                       $14,789,843               $21,589,835
- ----------------------------------------------------------------------------------------------


42


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
FACTORS CONSIDERED BY THE INDEPENDENT TRUSTEES IN
APPROVING THE MANAGEMENT CONTRACT
- --------------------------------------------------------------------------------

The Investment Company Act of 1940 requires that both the Board of Trustees and
a majority of the Independent Trustees (collectively "the Trustees") vote
separately annually to approve the Fund's management contract (the "Management
Contract"). The Trustees have determined that the terms of the Management
Contract are fair and reasonable and that renewal of the contract will enable
the Fund to receive quality investment advisory services at a cost deemed
reasonable and in the best interests of the Fund and its shareholders. In
making such determinations, the Independent Trustees relied upon the assistance
of counsel to the Independent Trustees and counsel to the Fund.

Throughout the year, the Independent Trustees regularly met in executive
session separately from the Interested Trustees of the Fund and any officer of
Pioneer Investment Management, Inc., the Fund's adviser (the "Investment
Adviser"), or its affiliates. While the Trustees, including the Independent
Trustees, act on all major matters relating to the Fund, a significant portion
of the activities of the Board of Trustees (including certain of those
described herein) is conducted through committees, the members of which are
comprised exclusively of Independent Trustees. Such committee meetings are
attended by officers of the Fund or the Investment Adviser to the extent
requested by the members of the committee.

In evaluating the Management Contract, the Trustees conducted a review that was
specifically focused upon the renewal of the Management Contract, and relied
upon their knowledge, resulting from their meetings throughout the year, of the
Investment Adviser, its services and the Fund. Both in meetings specifically
dedicated to renewal of the Management Contract and at other meetings during
the course of the year, the Trustees, including the Independent Trustees,
received materials relating to the Investment Adviser's investment and
management services under the Management Contract. These materials included (i)
information on the investment performance of the Fund, a peer group of funds
and two indices, in each case selected by the Independent Trustees for this
purpose, (ii) sales and redemption data in respect to the Fund, (iii) the
general investment outlook in the markets in which the Fund invests, (iv)
arrangements in respect of the distribution of the Fund's shares, (v) the
procedures employed to determine the value of each of the Fund's assets, (vi)
the Investment Adviser's management of the relationships with the Fund's
unaffiliated service providers, (vii) the record of compliance with the

                                                                              43


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
FACTORS CONSIDERED BY THE INDEPENDENT TRUSTEES IN
APPROVING THE MANAGEMENT CONTRACT                                    (continued)
- --------------------------------------------------------------------------------

Fund's investment policies and restrictions and with the Fund's Code of Ethics
and the structure and responsibilities of the Investment Adviser's compliance
department, (viii) the nature, cost and character of non-investment management
services provided by the Investment Adviser and its affiliates and (ix) the
disclosures included in the Fund's prospectuses and reports to shareholders.

Specifically in connection with the Independent Trustees' review of the
Management Contract, the Independent Trustees requested and the Investment
Adviser provided additional information in order to evaluate the quality of the
Investment Adviser's services and the reasonableness of the fee under the
Management Contract. Among other items, this information included data or
analyses of (1) investment performance for one, three and five year periods for
the Fund and a peer group selected by the Independent Trustees for this
purpose, (2) management fees incurred by a peer group of funds selected by the
Independent Trustees for this purpose, (3) the advisory fees of comparable
portfolios of other clients of the Investment Adviser, (4) expense ratios for
the Fund and a peer group of funds selected by the Independent Trustees for
this purpose, (5) the overall organization of the Investment Adviser, (6) the
Investment Adviser's financial results and condition, including its and certain
of its affiliates profitability from services performed for the Fund, (7)
transfer agency fees and administrative reimbursements paid to the Investment
Adviser or affiliates, (8) investment management staffing, and (9) operating
expenses paid to third parties. The Trustees also reviewed information
regarding the potential for the Fund and the Investment Adviser to benefit from
further economies of scale in the management of the Fund in light of reasonable
growth expectations for the Fund and certain of the Fund's expenses that are
not incurred as fees based on a percentage of net assets.

The following summarizes matters considered by the Trustees in connection with
their renewal of the Fund's Management Contract. The Trustees did not identify
any single factor as all-important or controlling, and the summary does not
detail all the matters that were considered.

A.  Ancillary Benefits to Shareholders. The Trustees considered the benefits to
    shareholders of investing in a Fund that is part of a large number of
    investment companies offering a variety of

44


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------

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

    investment disciplines and providing for a large variety of Fund and
    shareholder services.

B.  Compliance and Investment Performance. The Trustees determined that the
    Investment Adviser had policies and systems reasonably designed to achieve
    compliance with the Fund's investment objectives and regulatory
    requirements. The Trustees also reviewed the Fund's investment performance
    based upon total return, as well as the Fund's performance compared to both
    the performance of a peer group and an index, in each case selected by the
    Independent Trustees for this purpose. The Fund's performance based upon
    total return was in the second quintile of the peer group for the 12 months
    ended June 30, 2004, the third quintile of the peer group for the three
    years ended June 30, 2004, and the third quintile for the five years ended
    June 30, 2004. (In all quintile rankings referred to throughout this
    discussion first quintile is most favorable to the Fund's shareholders.
    Thus, highest relative performance would be first quintile and lowest
    relative expenses also would be first quintile.) The Trustees concluded that
    the performance of the Fund supported the continuation of the Management
    Contract.

C.  The Investment Adviser's Personnel and Methods. The Trustees reviewed the
    background of members of the team responsible for the daily management of
    the Fund and the Fund's investment objective and discipline. The Independent
    Trustees also have had discussions with senior management of the Investment
    Adviser responsible for investment operations and the senior management of
    the Investment Adviser's equities group. Among other things, the Trustees
    considered the number, education and experience of the Investment Adviser's
    investment staff and their use of technology and emphasis on analytics in
    view of the risk profile of securities in which the Fund invests. The
    Trustees concluded that the Investment Adviser had the quality and depth of
    personnel and the well-developed methods essential to performing its duties
    under the Management Contract.

D.  Nature and Quality of Other Services. The Trustees considered the nature,
    quality, cost and extent of other services provided to shareholders of the
    Fund, including administrative and shareholder services performed by the
    Investment Adviser under the Management Contract. The Trustees also
    considered the reasonableness of the

                                                                              45


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
FACTORS CONSIDERED BY THE INDEPENDENT TRUSTEES IN
APPROVING THE MANAGEMENT CONTRACT                                    (continued)
- --------------------------------------------------------------------------------

    arrangements for reimbursement of the Investment Adviser's out-of-pocket
    costs and expenses, including overhead, for certain administrative
    services that the Investment Adviser is not required to provide under the
    Management Contract. The Trustees also considered the nature and extent of
    the other services provided by the Investment Adviser's affiliates under
    other contracts and its supervision of third party service providers.
    Based on these considerations, the Trustees concluded that the nature,
    quality, cost and extent of such services are satisfactory and reliable
    and serve the shareholders of the Fund well.

E.  Management Fee and Expenses. The Trustees considered the Investment
    Adviser's fee under the Management Contract relative to the management fees
    charged by a peer group of funds selected by the Independent Trustees for
    this purpose using data provided by an independent third party. The Fund's
    management fee for the 12 months ended June 30, 2004 was in the fourth
    quintile relative to the management fees paid by the other funds in that
    peer group for the comparable period. The Trustees also considered that the
    performance fee structure aligned the interest of shareholders and the
    Investment Adviser. The Trustees noted that Pioneer was currently waiving
    the floor on the performance fee but evaluated the performance fee
    arrangement assuming the floor continued to be applied. The Trustees
    determined that the fee under the Management Contract was reasonable and
    fair in light of both the overall nature and quality of services provided by
    the Investment Adviser and the fees charged by the funds in the peer group.
    The Trustees also considered the Fund's expense ratio and expense ratios of
    a peer group of funds selected by the Independent Trustees for this purpose.
    The Fund's expense ratio for the 12 months ended June 30, 2004 was in the
    second quintile of the applicable peer group for the most recent fiscal year
    of the peer group for the comparable period. The Trustees concluded that the
    Fund's overall expense ratio was lower than that of comparable funds.

F.  Profitability. The Trustees considered the level of the Investment Adviser's
    profits with respect to the management of the Pioneer Funds, including
    details with respect to the Fund. This consideration included a review of
    the Investment Adviser's methodology in allocating certain of its costs to
    the management of each Fund. The Trustees also considered the financial
    results realized by the Investment Adviser in connection with the operation
    of the Fund.

46


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------

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

    They further considered the profits realized by the Investment Adviser and
    its affiliates from non-fund businesses that may benefit from or be
    related to the Fund's business. The Trustees considered the Investment
    Adviser's profit margins in comparison with the limited available industry
    data. The Trustees concluded that the Investment Adviser's profits from
    management of the Pioneer Funds, including the financial results derived
    from the Fund, bear a reasonable relationship to the services rendered and
    are fair for the management of the Fund.

G.  Economies of Scale. The Trustees considered the economies of scale with
    respect to the management of the Fund, whether the Fund had appropriately
    benefited from any economies of scale, and whether there was potential for
    realization of any further economies of scale. Because of break points in
    the management fee, the Trustees concluded that any perceived or potential
    economies of scale would be shared at future asset levels in a reasonable
    manner as the Fund grows in size between Fund's shareholders and the
    Investment Adviser.

H.  Other Benefits to the Investment Adviser. The Trustees also considered the
    character and amount of fees paid by the Fund, other than under the
    Management Contract, for services provided by the Investment Adviser and
    affiliates, including fees for services such as shareholder services. The
    Trustees also considered the receipt of sales loads and payments under Rule
    12b-1 plans in respect to the Pioneer Funds (including the Fund), and
    benefits to the Investment Adviser from the use of "soft" commission dollars
    to pay for research and brokerage services. The Trustees further considered
    the revenues and profitability of the Investment Adviser's businesses other
    than the fund business, including the Investment Adviser's institutional
    investment advisory business. The Trustees considered the intangible
    benefits that accrue to the Investment Adviser and its affiliates by virtue
    of its relationship with the Fund and the Pioneer Funds as a group. The
    Trustees concluded that all these types of benefits accruing to the
    Investment Adviser were reasonable in the context of the overall
    relationship between the Investment Adviser and the Fund.

Conclusion. The Trustees, in light of the Investment Adviser's overall
performance, considered it appropriate to continue to retain the management
services of the Investment Adviser. Based on their evalu-

                                                                              47


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
FACTORS CONSIDERED BY THE INDEPENDENT TRUSTEES IN
APPROVING THE MANAGEMENT CONTRACT                                    (continued)
- --------------------------------------------------------------------------------

ation of all material factors deemed relevant and the advice of independent
counsel, the Trustees concluded that the Management Contract with the Fund is
fair and reasonable and voted to approve the continuation of the Management
Contract for another year.






48


Pioneer Mid Cap Value Fund
- --------------------------------------------------------------------------------
TRUSTEES, OFFICERS AND SERVICE PROVIDERS
- --------------------------------------------------------------------------------



Trustees                              Officers
                                   
John F. Cogan, Jr., Chairman          John F. Cogan, Jr., President
David R. Bock                         Osbert M. Hood, Executive
Mary K. Bush                           Vice President
Margaret B.W. Graham                  Vincent Nave, Treasurer
Osbert M. Hood                        Dorothy E. Bourassa, Secretary
Marguerite A. Piret
Stephen K. West
John Winthrop


Investment Adviser
Pioneer Investment Management, Inc.

Custodian
Brown Brothers Harriman & Co.

Principal Underwriter
Pioneer Funds Distributor, Inc.

Legal Counsel
Wilmer Cutler Pickering Hale and Dorr LLP

Shareowner Services and Transfer Agent
Pioneer Investment Management Shareholder Services, Inc.


Proxy Voting Policies and Procedures of the Fund are available without charge,
upon request, by calling our toll free number (1-800-225-6292). Information
regarding how the Fund voted proxies relating to portfolio securities during
the most recent 6-month period ended August 31, 2004 is publicly available to
shareowners at www.pioneerfunds.com. This information is also available on the
Securities and Exchange Commission's web site at http://www.sec.gov.

                                                                              49


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50


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52


- --------------------------------------------------------------------------------
HOW TO CONTACT PIONEER
- --------------------------------------------------------------------------------

We are pleased to offer a variety of convenient ways for you to contact us for
assistance or information.

Call us for:

Account Information, including existing accounts,
new accounts, prospectuses, applications
and service forms                                                1-800-225-6292

FactFone(SM) for automated fund yields, prices,
account information and transactions                             1-800-225-4321

Retirement plans information                                     1-800-622-0176

Telecommunications Device for the Deaf (TDD)                     1-800-225-1997

Write to us:

PIMSS, Inc.
P.O. Box 55014
Boston, Massachusetts 02205-5014

Our toll-free fax                                                1-800-225-4240

Our internet e-mail address                       ask.pioneer@pioneerinvest.com
(for general questions about Pioneer only)

Visit our web site:                                        www.pioneerfunds.com

Please consider the Fund's investment objectives, risks, charges and expenses
carefully before investing. The prospectus contains this and other information
about the Fund and should be read carefully before you invest or send money. To
obtain a prospectus and for other information on any Pioneer fund, call
1-800-225-6292 or visit our web site www.pioneerfunds.com.

The Fund files a complete statement of investments with the Securities and
Exchange Commission for the first and third quarters for each fiscal year on
Form N-Q. Shareholders may view the filed Form N-Q by visiting the Commission's
web site at http://www.sec.gov. The filed form may also be viewed and copied at
the Commission's Public Reference Room in Washington, DC. Information regarding
the operations of the Public Reference Room may be obtained by calling
1-800-SEC-0330.



ITEM 2. CODE OF ETHICS.

(a) Disclose whether, as of the end of the period covered by the report, the
registrant has adopted a code of ethics that applies to the registrant's
principal executive officer, principal financial officer, principal accounting
officer or controller, or persons performing similar functions, regardless of
whether these individuals are employed by the registrant or a third party.  If
the registrant has not adopted such a code of ethics, explain why it has not
done so.

The registrant has adopted, as of the end of the period covered by this report,
a code of ethics that applies to the registrant's principal executive officer,
principal financial officer, principal accounting officer and controller.

(b) For purposes of this Item, the term "code of ethics" means written standards
that are reasonably designed to deter wrongdoing and to promote:

        (1) Honest and ethical conduct, including the ethical handling of actual
        or apparent conflicts of interest between personal and professional
        relationships;

        (2) Full, fair, accurate, timely, and understandable disclosure in
        reports and documents that a registrant files with, or submits to, the
        Commission and in other public communications made by the registrant;

        (3) Compliance with applicable governmental laws, rules, and
        regulations;

        (4) The prompt internal reporting of violations of the code to an
        appropriate person or persons identified in the code; and

        (5) Accountability for adherence to the code.

(c) The registrant must briefly describe the nature of any amendment, during the
period covered by the report, to a provision of its code of ethics that applies
to the registrant's principal executive officer, principal financial officer,
principal accounting officer or controller, or persons performing similar
functions, regardless of whether these individuals are employed by the
registrant or a third party, and that relates to any element of the code of
ethics definition enumerated in paragraph (b) of this Item. The registrant must
file a copy of any such amendment as an exhibit pursuant to Item 10(a), unless
the registrant has elected to satisfy paragraph (f) of this Item by posting its
code of ethics on its website pursuant to paragraph (f)(2) of this Item, or by
undertaking to provide its code of ethics to any person without charge, upon
request, pursuant to paragraph (f)(3) of this Item.

The registrant has made no amendments to the code of ethics during the period
covered by this report.

(d) If the registrant has, during the period covered by the report, granted a
waiver, including an implicit waiver, from a provision of the code of ethics to
the registrant's principal executive officer, principal financial officer,
principal accounting officer or controller, or persons performing similar
functions, regardless of whether these individuals are employed by the
registrant or a third party, that relates to one or more of the items set forth
in paragraph (b) of this Item, the registrant must briefly describe the nature
of the waiver, the name of the person to whom the waiver was granted, and the
date of the waiver.

Not applicable.

(e) If the registrant intends to satisfy the disclosure requirement under
paragraph (c) or (d) of this Item regarding an amendment to, or a waiver from,
a provision of its code of ethics that applies to the registrant's principal
executive officer, principal financial officer, principal accounting officer or
controller, or persons performing similar functions and that relates to any
element of the code of ethics definition enumerated in paragraph (b) of this
Item by posting such information on its Internet website, disclose the
registrant's Internet address and such intention.

Not applicable.

(f) The registrant must:

        (1) File with the Commission, pursuant to Item 10(a), a copy of its code
        of ethics that applies to the registrant's principal executive officer,
        principal financial officer, principal accounting officer or controller,
        or persons performing similar functions, as an exhibit to its annual
        report on this Form N-CSR;

        (2) Post the text of such code of ethics on its Internet website and
        disclose, in its most recent report on this Form N-CSR, its Internet
        address and the fact that it has posted such code of ethics on its
        Internet website; or

        (3) Undertake in its most recent report on this Form N-CSR to provide to
        any person without charge, upon request, a copy of such code of ethics
        and explain the manner in which such request may be made.
	See Item 10(2)

ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT.

(a) (1)  Disclose that the registrant's board of trustees has determined that
         the registrant either:

    (i)  Has at least one audit committee financial expert serving on its audit
         committee; or

    (ii) Does not have an audit committee financial expert serving on its audit
         committee.

The registrant's Board of Trustees has determined that the registrant has at
least one audit committee financial expert.

    (2) If the registrant provides the disclosure required by paragraph
(a)(1)(i) of this Item, it must disclose the name of the audit committee
financial expert and whether that person is "independent." In order to be
considered "independent" for purposes of this Item, a member of an audit
committee may not, other than in his or her capacity as a member of the audit
committee, the board of trustees, or any other board committee:

    (i)  Accept directly or indirectly any consulting, advisory, or other
         compensatory fee from the issuer; or

    (ii) Be an "interested person" of the investment company as defined in
         Section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19)).

Ms. Marguerite A. Piret, an independent trustee, is such an audit committee
financial expert.

    (3) If the registrant provides the disclosure required by paragraph (a)(1)
(ii) of this Item, it must explain why it does not have an audit committee
financial expert.

Not applicable.


ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES.

(a) Disclose, under the caption AUDIT FEES, the aggregate fees billed for each
of the last two fiscal years for professional services rendered by the principal
accountant for the audit of the registrant's annual financial statements or
services that are normally provided by the accountant in connection with
statutory and regulatory filings or engagements for those fiscal years.

N/A

(b) Disclose, under the caption AUDIT-RELATED FEES, the aggregate fees billed in
each of the last two fiscal years for assurance and related services by the
principal accountant that are reasonably related to the performance of the audit
of the registrant's financial statements and are not reported under
paragraph (a) of this Item. Registrants shall describe the nature of the
services comprising the fees disclosed under this category.

N/A

(c) Disclose, under the caption TAX FEES, the aggregate fees billed in each of
the last two fiscal years for professional services rendered by the principal
accountant for tax compliance, tax advice, and tax planning. Registrants shall
describe the nature of the services comprising the fees disclosed under this
category.

N/A

(d) Disclose, under the caption ALL OTHER FEES, the aggregate fees billed in
each of the last two fiscal years for products and services provided by the
principal accountant, other than the services reported in paragraphs (a) through
(c) of this Item. Registrants shall describe the nature of the services
comprising the fees disclosed under this category.

N/A

(e) (1) Disclose the audit committee's pre-approval policies and procedures
described in paragraph (c)(7) of Rule 2-01 of Regulation S-X.

 PIONEER FUNDS
            APPROVAL OF AUDIT, AUDIT-RELATED, TAX AND OTHER SERVICES
                       PROVIDED BY THE INDEPENDENT AUDITOR

                  SECTION I - POLICY PURPOSE AND APPLICABILITY

The Pioneer Funds recognize the importance of maintaining the independence of
their outside auditors. Maintaining independence is a shared responsibility
involving Pioneer Investment Management, Inc ("PIM"), the audit committee and
the independent auditors.

The Funds recognize that a Fund's independent auditors: 1) possess knowledge of
the Funds, 2) are able to incorporate certain services into the scope of the
audit, thereby avoiding redundant work, cost and disruption of Fund personnel
and processes, and 3) have expertise that has value to the Funds. As a result,
there are situations where it is desirable to use the Fund's independent
auditors for services in addition to the annual audit and where the potential
for conflicts of interests are minimal. Consequently, this policy, which is
intended to comply with Rule 210.2-01(C)(7), sets forth guidelines and
procedures to be followed by the Funds when retaining the independent audit firm
to perform audit, audit-related tax and other services under those
circumstances, while also maintaining independence.

Approval of a service in accordance with this policy for a Fund shall also
constitute approval for any other Fund whose pre-approval is required pursuant
to Rule 210.2-01(c)(7)(ii).

In addition to the procedures set forth in this policy, any non-audit services
that may be provided consistently with Rule 210.2-01 may be approved by the
Audit Committee itself and any pre-approval that may be waived in accordance
with Rule 210.2-01(c)(7)(i)(C) is hereby waived.

Selection of a Fund's independent auditors and their compensation shall be
determined by the Audit Committee and shall not be subject to this policy.



                               SECTION II - POLICY

- ---------------- -------------------------------- -------------------------------------------------
SERVICE           SERVICE CATEGORY DESCRIPTION      SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES
CATEGORY
- ---------------- -------------------------------- -------------------------------------------------
                                            
I.  AUDIT        Services that are directly       o Accounting research assistance
SERVICES         related to performing the        o SEC consultation, registration
                 independent audit of the Funds     statements, and reporting
                                                  o Tax accrual related matters
                                                  o Implementation of new accounting
                                                    standards
                                                  o Compliance letters (e.g. rating agency
                                                    letters)
                                                  o Regulatory reviews and assistance
                                                    regarding financial matters
                                                  o Semi-annual reviews (if requested)
                                                  o Comfort letters for closed end
                                                    offerings
- ---------------- -------------------------------- -------------------------------------------------
II.              Services which are not           o AICPA attest and agreed-upon procedures
AUDIT-RELATED    prohibited under Rule            o Technology control assessments
SERVICES         210.2-01(C)(4) (the "Rule")      o Financial reporting control assessments
                 and are related extensions of    o Enterprise security architecture
                 the audit services support the     assessment
                 audit, or use the
                 knowledge/expertise gained
                 from the audit procedures as a
                 foundation to complete the
                 project.  In most cases, if
                 the Audit-Related Services are
                 not performed by the Audit
                 firm, the scope of the Audit
                 Services would likely
                 increase.  The Services are
                 typically well-defined and
                 governed by accounting
                 professional standards (AICPA,
                 SEC, etc.)
- ---------------- -------------------------------- -------------------------------------------------

 ------------------------------------- ------------------------------------
                                    
   AUDIT COMMITTEE APPROVAL POLICY               AUDIT COMMITTEE
                                                REPORTING POLICY
 ------------------------------------- ------------------------------------
                                    
 o "One-time" pre-approval             o A summary of all such
   for the audit period for all          services and related fees
   pre-approved specific service         reported at each regularly
   subcategories.  Approval of the       scheduled Audit Committee
   independent auditors as               meeting.
   auditors for a Fund shall
   constitute pre approval for
   these services.
 ------------------------------------- ------------------------------------
 o "One-time" pre-approval             o A summary of all such
   for the fund fiscal year within       services and related fees
   a specified dollar limit              (including comparison to
   for all pre-approved                  specified dollar limits)
   specific service subcategories        reported quarterly.

 o Specific approval is
   needed to exceed the
   pre-approved dollar limit for
   these services (see general
   Audit Committee approval policy
   below for details on obtaining
   specific approvals)

 o Specific approval is
   needed to use the Fund's
   auditors for Audit-Related
   Services not denoted as
   "pre-approved", or
   to add a specific service
   subcategory as "pre-approved"
 ------------------------------------- ------------------------------------




                     SECTION III - POLICY DETAIL, CONTINUED

- ----------------------- --------------------------- -----------------------------------------------
   SERVICE CATEGORY          SERVICE CATEGORY        SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES
                               DESCRIPTION
- ----------------------- --------------------------- -----------------------------------------------
                                              
III. TAX SERVICES       Services which are not      o Tax planning and support
                        prohibited by the Rule,     o Tax controversy assistance
                        if an officer of the Fund   o Tax compliance, tax returns, excise
                        determines that using the     tax returns and support
                        Fund's auditor to provide   o Tax opinions
                        these services creates
                        significant synergy in
                        the form of efficiency,
                        minimized disruption, or
                        the ability to maintain a
                        desired level of
                        confidentiality.
- ----------------------- --------------------------- -----------------------------------------------

- ------------------------------------- -------------------------
  AUDIT COMMITTEE APPROVAL POLICY         AUDIT COMMITTEE
                                          REPORTING POLICY
- ------------------------------------- -------------------------
- ------------------------------------- -------------------------
o "One-time" pre-approval             o A summary of
  for the fund fiscal  year             all such services and
  within a specified dollar limit       related fees
  				        (including comparison
  			                to specified dollar
  			                limits) reported
  			                quarterly.

o Specific approval is
  needed to exceed the
  pre-approved dollar limits for
  these services (see general
  Audit Committee approval policy
  below for details on obtaining
  specific approvals)

o Specific approval is
  needed to use the Fund's
  auditors for tax services not
  denoted as pre-approved, or to add a specific
  service subcategory as
  "pre-approved"
- ------------------------------------- -------------------------




                     SECTION III - POLICY DETAIL, CONTINUED

- ----------------------- --------------------------- -----------------------------------------------
   SERVICE CATEGORY          SERVICE CATEGORY        SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES
                               DESCRIPTION
- ----------------------- --------------------------- -----------------------------------------------
                                              
IV.  OTHER SERVICES     Services which are not      o Business Risk Management support
                        prohibited by the Rule,     o Other control and regulatory
A. SYNERGISTIC,         if an officer of the Fund     compliance projects
UNIQUE QUALIFICATIONS   determines that using the
                        Fund's auditor to provide
                        these services creates
                        significant synergy in
                        the form of efficiency,
                        minimized disruption,
                        the ability to maintain a
                        desired level of
                        confidentiality, or where
                        the Fund's auditors
                        posses unique or superior
                        qualifications to provide
                        these services, resulting
                        in superior value and
                        results for the Fund.
- ----------------------- --------------------------- -----------------------------------------------

- --------------------------------------- ------------------------
    AUDIT COMMITTEE APPROVAL POLICY         AUDIT COMMITTEE
                                            REPORTING POLICY
- ------------------------------------- --------------------------
                                   
o "One-time" pre-approval             o A summary of
  for the fund fiscal year within       all such services and
  a specified dollar limit              related fees
  			               (including comparison
  			                to specified dollar
  				        limits) reported
                                        quarterly.
o Specific approval is
  needed to exceed the
  pre-approved dollar limits for
  these services (see general
  Audit Committee approval policy
  below for details on obtaining
  specific approvals)

o Specific approval is
  needed to use the Fund's
  auditors for "Synergistic" or
  "Unique Qualifications" Other
  Services not denoted as
  pre-approved to the left, or to
  add a specific service
  subcategory as "pre-approved"
- ------------------------------------- --------------------------




                     SECTION III - POLICY DETAIL, CONTINUED

- ----------------------- ------------------------- -----------------------------------------------
   SERVICE CATEGORY         SERVICE CATEGORY        SPECIFIC PROHIBITED SERVICE SUBCATEGORIES
                              DESCRIPTION
- ----------------------- ------------------------- -----------------------------------------------
                                            
PROHIBITED  SERVICES    Services which result     1. Bookkeeping or other services
                        in the auditors losing       related to the accounting records or
                        independence status          financial statements of the audit
                        under the Rule.              client*
                                                  2. Financial information systems design
                                                     and implementation*
                                                  3. Appraisal or valuation services,
                                                     fairness* opinions, or
                                                     contribution-in-kind reports
                                                  4. Actuarial services (i.e., setting
                                                     actuarial reserves versus actuarial
                                                     audit work)*
                                                  5. Internal audit outsourcing services*
                                                  6. Management functions or human
                                                     resources
                                                  7. Broker or dealer, investment
                                                     advisor, or investment banking services
                                                  8. Legal services and expert services
                                                     unrelated to the audit
                                                  9. Any other service that the Public
                                                     Company Accounting Oversight Board
                                                     determines, by regulation, is
                                                     impermissible
- ----------------------- ------------------------- -----------------------------------------------

- ------------------------------------------- ------------------------------
     AUDIT COMMITTEE APPROVAL POLICY               AUDIT COMMITTEE
                                                  REPORTING POLICY
- ------------------------------------------- ------------------------------
o These services are not to be              o A summary of all
  performed with the exception of the(*)      services and related
  services that may be permitted              fees reported at each
  if they would not be subject to audit       regularly scheduled
  procedures at the audit client (as          Audit Committee meeting
  defined in rule 2-01(f)(4)) level           will serve as continual
  the firm providing the service.             confirmation that has
  				              not provided any
                                              restricted services.
- ------------------------------------------- ------------------------------

- --------------------------------------------------------------------------------
GENERAL AUDIT COMMITTEE APPROVAL POLICY:
o For all projects, the officers of the Funds and the Fund's auditors will each
  make an assessment to determine that any proposed projects will not impair
  independence.

o Potential services will be classified into the four non-restricted service
  categories and the "Approval of Audit, Audit-Related, Tax and Other
  Services" Policy above will be applied. Any services outside the specific
  pre-approved service subcategories set forth above must be specifically
  approved by the Audit Committee.

o At least quarterly, the Audit Committee shall review a report summarizing the
  services by service category, including fees, provided by the Audit firm as
  set forth in the above policy.

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


    (2) Disclose the percentage of services described in each of paragraphs (b)
   through (d) of this Item that were approved by the audit committee pursuant
   to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X.

    N/A

(f) If greater than 50 percent, disclose the percentage of hours expended on the
principal accountant's engagement to audit the registrant's financial statements
for the most recent fiscal year that were attributed to work performed by
persons other than the principal accountant's full-time, permanent employees.

N/A

(g) Disclose the aggregate non-audit fees billed by the registrant's accountant
for services rendered to the registrant, and rendered to the registrant's
investment adviser (not including any sub-adviser whose role is primarily
portfolio management and is subcontracted with or overseen by another investment
adviser), and any entity controlling, controlled by, or under common control
with the adviser that provides ongoing services to the registrant for each of
the last two fiscal years of the registrant.

The Fund's independent auditor, Ernst & Young
LLP ("E&Y"), has advised the Securities
and Exchange Commission, the Public Company
Accounting Oversight Board, and the Audit
Committee of the Fund's Board of Trustees that
certain non-audit work performed by E&Y's China
affiliate raised questions regarding E&Y's
independence with respect to its performance of
audit services for the Fund.  In July 2004, E&Y
became aware that member firms in China ("E&Y
China") provided certain tax services to offices of
UniCredito Italiano, S.p.A. ("UCI"), a member of
the Fund's Investment Company Complex.  The
services included receipt and disbursement of
monies transferred to E&Y China by UCI in
payment of individual expatriate income taxes due
on returns prepared by E&Y China for certain UCI
employees located in China from October 1998 to
May 2003.  E&Y became auditors of the Fund in
May 2002.  These expatriate tax services were
discontinued in May 2003.  The fees received by
E&Y China for all such services totaled $3,685.

The Fund's Audit Committee and E&Y have
discussed the matter, including the nature of the
services provided, the personnel involved in
providing the services and the fees received by
E&Y for performing the services.  E&Y has informed
the Audit Committee that based on its internal reviews
and the de minimis nature of the services provided and
fees received, it does not believe its independence
with respect to the Fund has been impaired.

N/A


(h) Disclose whether the registrant's audit committee of the board of trustees
has considered whether the provision of non-audit services that were rendered to
the registrant's investment adviser (not including any subadviser whose role is
primarily portfolio management and is subcontracted with or overseen by another
investment adviser), and any entity controlling, controlled by, or under common
control with the investment adviser that provides ongoing services to the
registrant that were not pre-approved pursuant to paragraph (c)(7)(ii) of
Rule 2-01 of Regulation S-X is compatible with maintaining the principal
accountant's independence.

N/A


ITEMS 5-6. [RESERVED]


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

A closed-end management investment company that is filing an annual report on
this Form N-CSR must, unless it invests exclusively in non-voting securities,
describe the policies and procedures that it uses to determine how to vote
proxies relating to portfolio securities, including the procedures that the
company uses when a vote presents a conflict between the interests of its
shareholders, on the one hand, and those of the company's investment adviser;
principal underwriter; or any affiliated person (as defined in Section 2(a)(3)
of the Investment Company Act of 1940 (15 U.S.C. 80a-2(a)(3)) and the rules
thereunder) of the company, its investment adviser, or its principal
underwriter, on the other. Include any policies and procedures of the company's
investment adviser, or any other third party, that the company uses, or that are
used on the company's behalf, to determine how to vote proxies relating to
portfolio securities.

Not applicable to open-end management investment companies.


ITEM 8. [RESERVED]


ITEM 9. CONTROLS AND PROCEDURES.

(a) Disclose the conclusions of the registrant's principal executive officer or
officers and principal financial officer or officers, or persons performing
similar functions, about the effectiveness of the registrant's disclosure
controls and procedures (as defined in Rule 30a-2(c) under the Act (17 CFR
270.30a-2(c))) based on their evaluation of these controls and procedures as of
a date within 90 days of the filing date of the report that includes the
disclosure required by this paragraph.

The registrant's principal executive officer and principal financial
officer have concluded, that the registrant's disclosure controls and
procedures are effective based on their evaluation of these controls and
procedures as of a date within 90 days of the filing date of this report.


(b) Disclose whether or not there were significant changes in the registrant's
internal controls or in other factors that could significantly affect these
controls subsequent to the date of their evaluation, including any corrective
actions with regard to significant deficiencies and material weaknesses.

There were no significant changes in the registrant's internal controls or
in other factors that could significantly affect these controls subsequent to
the date of their evaluation, including any corrective actions with regard
to significant deficiencies and material weaknesses.


ITEM 10. EXHIBITS.

File the exhibits listed below as part of this Form. Letter or number the
exhibits in the sequence indicated.

(a) Any code of ethics, or amendment thereto, that is the subject of the
disclosure required by Item 2, to the extent that the registrant intends to
satisfy the Item 2 requirements through filing of an exhibit.



(b) A separate certification for each principal executive officer and principal
financial officer of the registrant as required by Rule 30a-2 under the Act
(17 CFR 270.30a-2).

Filed herewith.





                                   SIGNATURES

                          [See General Instruction F]


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.


(Registrant) Pioneer Mid Cap Value Fund


By (Signature and Title)* /s/ John F. Cogan, Jr.
John F. Cogan, Jr, President

Date  June 28, 2005


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 (Signature and Title)* /s/ John F. Cogan, Jr.
John F. Cogan, Jr., President

Date June 28, 2005


By (Signature and Title)* /s/ Vincent Nave
Vincent Nave, Treasurer

Date June 28, 2005

* Print the name and title of each signing officer under his or her signature.