OMB APPROVAL OMB Number: 3235-0570 Expires: November 30, 2005 Estimated average burden hours per response..... 5.0 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 - -------------------------------------------------------------------------------- This page for your notes. 50 - -------------------------------------------------------------------------------- This page for your notes. 51 - -------------------------------------------------------------------------------- This page for your notes. 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.