OMB APPROVAL OMB Number: 3235-0570 Expires: August 31, 2013 Estimated average burden hours per response.....18.9 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 811-21460 Pioneer Series Trust II (Exact name of registrant as specified in charter) 60 State Street, Boston, MA 02109 (Address of principal executive offices) (ZIP code) Terrence J. Cullen, 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: December 31 Date of reporting period: January 1, 2010 through December 31, 2010 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 AMT-Free Municipal Fund - -------------------------------------------------------------------------------- Annual Report | December 31, 2010 - -------------------------------------------------------------------------------- Ticker Symbols: Class A PBMFX Class B PBMUX Class C MNBCX Class Y PBYMX [LOGO] PIONEER Investments(R) visit us: pioneerinvestments.com Table of Contents Letter to Shareowners 2 Portfolio Management Discussion 4 Portfolio Summary 8 Prices and Distributions 9 Performance Update 10 Comparing Ongoing Fund Expenses 14 Schedule of Investments 16 Financial Statements 31 Notes to Financial Statements 39 Report of Independent Registered Public Accounting Firm 48 Approval of Investment Advisory Agreement 50 Trustees, Officers and Service Providers 54 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 1 President's Letter Dear Shareowner, Throughout 2010, the U.S. economy moved forward on a slow path to recovery. But with the memory of a deep recession still lingering, businesses and consumers remained cautious about both investing and spending. While business fundamentals showed signs of improvement, there was still a reluctance to hire, and high unemployment remains a problem. Wary investors, concerned about risk, gravitated towards cash and bonds, until a rally late in the year lifted equity returns. We remain generally optimistic about the prospects for economic recovery, although it may occur more slowly than many would like. At Pioneer, we have long advocated the benefits of staying diversified and investing for the long term. This strategy has generally performed well for many investors. Bond markets certainly rewarded investors in the first eleven months of 2010. While the equity markets barely budged for those first eleven months, valuations were inexpensive relative to bonds, compared with historic levels, and represented potentially good value for long-term investors, many of whom were rewarded in the subsequent late-year equity rally. Pioneer has not changed the basic approach to investing that we have used for more than 80 years. We remain focused on company fundamentals and risk management. Our investment process is based on careful research into individual companies, quantitative analysis, and active portfolio management. This three-pillared process, which we apply to each of our portfolios, is supported by an integrated team approach and is designed to carefully balance risk and reward. Our experienced professionals devote themselves to the careful research needed to identify investment opportunities in markets around the world. Our advice, as always, is to work closely with a trusted financial advisor to discuss your goals and work together to develop an investment strategy that meets your individual needs. There is no single best strategy that works for every investor. 2 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 We invite you to learn more about Pioneer and our time-tested approach to investing by consulting with your financial advisor or visiting us online at www.pioneerinvestments.com. We greatly appreciate your trust in us and we thank you for investing with Pioneer. Sincerely, /s/ Daniel K. Kingsbury Daniel K. Kingsbury President and CEO Pioneer Investment Management USA, 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. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 3 Portfolio Management Discussion | 12/31/10 In the following interview, David Eurkus outlines the investment environment for tax-free bonds during the Pioneer AMT-Free Municipal Fund's most recent fiscal year ended December 31, 2010, as well as the Fund's performance, his investment strategy and his outlook going forward. Mr. Eurkus, senior vice president at Pioneer, is the lead portfolio manager of the Fund, which is co-managed by Timothy Pynchon. Q How did the Fund perform during the 12 months ended December 31, 2010? A For the 12 months ended December 31, 2010, Pioneer AMT-Free Municipal Fund Class A shares returned 2.15% at net asset value, while the Fund's benchmark, the Barclays Capital Municipal Bond Index, returned 2.38%. Over the same period, the average return of the 259 mutual funds in Lipper's General Municipal Debt Funds category was 1.72%. Q How would you describe the investing environment for tax-exempt bonds during the 12 months ended December 31, 2010? A Over the 12-month period ended December 31, 2010, the U.S. economy continued to recover, though growth was slow and the environment difficult in light of stubbornly high unemployment and ongoing elevated foreclosure rates in the housing market. In addition, a number of debt-ridden European countries were forced to seek assistance from the European Central Bank and the International Monetary Fund, and to commit to slashing their budgets going forward. For the first nine months of 2010, the municipal bond market performed well, and there was a high level of inflows from the money market sector into municipal bond funds because of near-zero interest rates on very short-term investment vehicles. Tax-exempt bonds were also benefiting from reduced supply, due in part to increased supply in the taxable marketplace because of the government's Build America Bonds (BAB) program. Toward the end of the third quarter (late September 2010), however, the tax-exempt bond market began to be hit hard by a number of negative events, including spikes in long-term interest rates and a steeper yield curve; negative headlines regarding the fiscal health and solvency of some states and municipalities; outflows from mutual funds as investors reacted to the media coverage; volatile Treasury yields; and negative credit news for certain classes of municipals, including tobacco bonds. In addition, during the summer of 2010 the U.S. Federal Reserve Board (the Fed) hinted at and then later announced a second round of quantitative easing ("QE2") -- including purchases of $600 billion in Treasury securities -- in order to provide 4 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 support for the economy and for asset prices. When the official announcement of QE2 was made, many investors were surprised to learn that the Fed would not be purchasing 30-year Treasuries, and long-term bonds sold off. Lastly, Congress' decision to end the BAB program as part of its year-end tax and employment benefits deal prompted another sell-off in the municipal market, as investors anticipated a significant increase in municipal bond supply going forward. The series of unfavorable events caused municipals to post their worst performance in a fourth quarter (on a relative and absolute basis) since 1980, as yields on high-grade 30-year municipal bonds rose by over 100 basis points (one percentage point) as their prices declined. The slide in the municipal bond market in the fourth quarter was also the market's worst for any three-month period since the first quarter of 1994. Despite the recent downdraft in tax-exempt bond prices, however, municipals managed to post positive returns for 2010 as a whole, and tax-free bonds retained the lowest default rate of any fixed-income class besides Treasuries, which are guaranteed by the federal government. Q Will you discuss your overall investment strategy for the Fund over the 12-month period ended December 31, 2010? A Our principal strategy for the Fund is to purchase and hold discounted long-term municipal bonds, as those investments offer the highest yields in the tax-exempt marketplace. Despite the recent disruptions in the municipal market, on a long-term basis we continue to be comfortable with the Fund's long-duration stance. (Duration is a measure of a portfolio's sensitivity to changes in interest rates.) We believe that our broadly diversified strategy may enable the Fund to outperform its benchmark and peers over the long term. During the 12-month period, the Fund also continued to have a strong focus on sectors vital to communities nationwide, whether the U.S. economy is growing or contracting. The sectors include health care/hospitals, public and private education, transportation, power and energy. We also maintained a strong focus on overall portfolio quality during the 12-month period. As of December 31, 2010, 13% of the Fund's portfolio was rated AAA or the equivalent, and 61% was rated A or better. In addition, the Fund remained broadly diversified among a wide range of municipal bond sectors. Q What were the most significant contributors to and detractors from Fund performance during the 12 months ended December 31, 2010, and did you make any significant changes to the Fund's portfolio during the 12-month period? A As we were comfortable with bond positions already built into the Fund's portfolio over the last two years, and with the Fund's long-duration stance, Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 5 we did not make any significant purchases or sales over the period. The Fund benefited from previous investments in health care/hospital bonds, which have been staging a recovery following a long period of uncertainty regarding the details of federal health care legislation, now signed into law. Also, the Fund's credit stance, emphasizing A-rated and Baa credits as often undervalued, contributed to benchmark-relative performance. In contrast, the Fund's long-duration stance detracted from performance during the period, albeit in the short term, as negative news about the municipal markets caused yields of long-term bonds to rise sharply. Also, the Fund's modest holdings in tobacco bonds, derived from 1998's Master Settlement Agreement between 46 states and major tobacco companies, detracted from performance results. Investors have been concerned about slowing receipts from tobacco firms (which are used to pay the bonds' principal and interest), given that cigarette consumption has declined recently. Lastly, pre-refunded municipal bonds held in the Fund's portfolio detracted from performance, as Treasury yields rose during the 12 months ended December 31, 2010. (Pre-refunded municipal bonds are tax-exempt securities where the issuer decides to buy its bonds back before the scheduled maturity date, and then reinvest the proceeds in Treasury bills until the scheduled "call" date of the original bond.) Q What is your outlook going forward? A While the tax-exempt bond market has endured a relatively large decline in prices during the past few months, we feel that many municipal bonds are undervalued and very attractively priced. Of course, we cannot be confident that the worst disruptions in the market are over until most tax-exempt bond funds stop experiencing severe outflows. That will depend, in part, on a decline in the negative media headlines that have helped to push municipal yields sharply higher. We believe, however, that projections by some market observers of widespread defaults and bankruptcies for local municipal credits will turn out to be overstated. As the expected realization of that likely outcome takes hold in the coming weeks and months, we believe that positive fund flows should once again provide support for the tax-exempt market, and could even spark a rally. The U.S. economy, although improving, is not terribly robust. Inflation remains near zero, however, and the Fed's comments indicating that they will remain on hold regarding short-term interest rates for the foreseeable future cause us to be quite positive regarding prospects for the long-term municipal bonds held in the Fund's portfolio. Additionally, the possibility of higher Federal taxes in the future has made municipal bonds appear attractive. 6 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 Our plan is for the Fund to continue to hold select long-term tax-exempt bonds that we believe have the strongest opportunity to perform well, and we will seek to avoid municipals that could falter due to budgetary problems on the part of their issuers. We will continue to monitor the Fund's holdings closely to ensure their integrity and quality, and the timely payment of principal and interest on the investments. The Fund remains broadly diversified, with only very limited exposure to general obligation bonds, which are more tied to states' general revenues. The vast majority of Fund holdings are in bonds with dedicated revenue streams, which we also continue to monitor closely. Going forward, we will continue to look for opportunities to lock in attractive yields for the Fund derived from high-quality, long-term tax-free bonds. We believe that Pioneer AMT-Free Municipal Fund continues to be a suitable vehicle for long-term investors seeking high income free from federal taxes. Please refer to the Schedule of Investments on pages 16-30 for a full listing of Fund securities. When interest rates rise, the prices of fixed-income securities in the Fund will generally fall. Conversely, when interest rates fall, the prices of fixed-income securities in the Fund will generally rise. Investments in the Fund are subject to possible loss due to the financial failure of issuers of underlying securities and their inability to meet their debt obligations. Investing in foreign and/or emerging markets securities involves risks relating to interest rates, currency exchange rates, economic, and political conditions. At times, the Fund's investments may represent industries or industry sectors that are interrelated or have common risks, making the Fund more susceptible to any economic, political, or regulatory developments or other risks affecting those industries and sectors. Past performance is not a guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. 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 opinions should not be relied upon for any other purposes. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 7 Portfolio Summary | 12/31/10 Portfolio Quality - -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [The following data was represented as a pie chart in the printed material] BBB 32.2% AA 24.0% A 23.8% AAA 12.9% Not Rated 3.1% CCC 2.2% BB & Lower 1.8% Sector Distribution - -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [The following data was represented as a pie chart in the printed material] Insured 33.0% Health 26.7% Various Revenues 8.6% Special Revenues 7.0% Education 5.1% Transportation 4.6% Water & Sewer 3.2% General Obligation 2.7% Escrowed 2.6% Pollution Control Revenue 2.5% Housing 2.1% Power 1.9% 10 Largest Holdings* - -------------------------------------------------------------------------------- (As a percentage of total long-term holdings) 1. California State, 4.25%, 8/1/33 1.84% 2. California Statewide Communities Development Authority, 5.0%, 8/15/47 1.83 3. Massachusetts State Housing Finance Agency, 5.4%, 12/1/28 1.62 4. North Carolina Eastern Municipal Power, 6.0%, 1/1/22 1.57 5. Dallas County Texas Utility & Reclamation, 5.375%, 2/15/29 1.51 6. Public Authority For Colorado Energy, 6.5%, 11/15/38 1.51 7. Tampa-Hillsborough County Florida, 4.0%, 7/1/34 1.28 8. New Jersey Transportation, 0.0%, 12/15/27 1.26 9. King County Washington Housing, 5.5%, 5/1/38 1.26 10. Philadelphia Hospital, 5.0%, 7/1/34 1.22 * This list excludes temporary cash investments and derivative instruments. The portfolio is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any security listed. 8 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 Prices and Distributions | 12/31/10 Net Asset Value per Share - -------------------------------------------------------------------------------- - ------------------------------------------------------ Class 12/31/10 12/31/09 - ------------------------------------------------------ A $ 12.56 $ 12.86 - ------------------------------------------------------ B $ 12.48 $ 12.78 - ------------------------------------------------------ C $ 12.46 $ 12.77 - ------------------------------------------------------ Y $ 12.53 $ 12.84 - ------------------------------------------------------ Distributions per Share: 1/1/10-12/31/10 - -------------------------------------------------------------------------------- - ---------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains - ---------------------------------------------------------------------- A $ 0.5920 $ -- $ -- - ---------------------------------------------------------------------- B $ 0.4738 $ -- $ -- - ---------------------------------------------------------------------- C $ 0.4849 $ -- $ -- - ---------------------------------------------------------------------- Y $ 0.6258 $ -- $ -- - ---------------------------------------------------------------------- Index Definitions - -------------------------------------------------------------------------------- The Barclays Capital Municipal Bond Index is a broad measure of the municipal bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. It is not possible to invest directly in an index. The index defined here pertains to the "Value of $10,000 Investment" and "Value of $5 million Investment" charts shown on pages 10-13. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 9 Performance Update | 12/31/10 Class A Shares Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer AMT-Free Municipal Fund at public offering price, compared to that of the Barclays Capital Municipal Bond Index. Average Annual Total Returns (As of December 31, 2010) - ------------------------------------------------------------------------ Net Asset Public Offering Period Value (NAV) Price (POP) - ------------------------------------------------------------------------ 10 Years 4.48% 4.00% 5 Years 2.85 1.90 1 Year 2.15 -2.47 - ------------------------------------------------------------------------ Expense Ratio (Per prospectus dated May 1, 2010) - ------------------------------------------------------------------------ Gross Net - ------------------------------------------------------------------------ 0.88% 0.82% - ------------------------------------------------------------------------ [The following data was represented as a mountain chart in the printed material] Value of $10,000 Investment Pioneer Barclays Capital AMT-Free Municipal Municipal Fund Bond Index 12/31/2000 $ 9,550 $10,000 12/31/2001 $10,018 $10,513 12/31/2002 $11,017 $11,522 12/31/2003 $11,641 $12,134 12/31/2004 $12,275 $12,678 12/31/2005 $12,865 $13,124 12/31/2006 $13,535 $13,759 12/31/2007 $13,723 $14,221 12/31/2008 $11,685 $13,870 12/31/2009 $14,491 $15,661 12/31/2010 $14,802 $16,033 Call 1-800-225-6292 or visit www.pioneerinvestments.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 4.50% 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. Pioneer AMT-Free Municipal Fund was created through the reorganization of predecessor fund, Safeco Municipal Bond Fund, on December 10, 2004. The performance shown for Class A shares of the Fund for periods prior to December 10, 2004, is based on the performance of the predecessor fund's Class A shares, which has been restated to reflect differences in any applicable sales charges (but not differences in expenses). If all the expenses of the Fund were reflected, the performance would be lower. 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 net expense ratio reflects the contractual expense limitation currently in effect through June 1, 2012 for Class A shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please 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. 10 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 Performance Update | 12/31/10 Class B Shares Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer AMT-Free Municipal Fund, compared to that of the Barclays Capital Municipal Bond Index. Average Annual Total Returns (As of December 31, 2010) - ------------------------------------------------------------------ If If Period Held Redeemed - ------------------------------------------------------------------ 10 Years 3.63% 3.63% 5 Years 1.96 1.96 1 Year 1.25 -2.65 - ------------------------------------------------------------------ Expense Ratio (Per prospectus dated May 1, 2010) - ------------------------------------------------------------------ Gross Net - ------------------------------------------------------------------ 1.71% 1.71% - ------------------------------------------------------------------ [The following data was represented as a mountain chart in the printed material] Value of $10,000 Investment Pioneer Barclays Capital AMT-Free Municipal Municipal Fund Bond Index 12/31/2000 $10,000 $10,000 12/31/2001 $10,414 $10,513 12/31/2002 $11,357 $11,522 12/31/2003 $11,918 $12,134 12/31/2004 $12,464 $12,678 12/31/2005 $12,963 $13,124 12/31/2006 $13,528 $13,759 12/31/2007 $13,590 $14,221 12/31/2008 $11,471 $13,870 12/31/2009 $14,105 $15,661 12/31/2010 $14,282 $16,033 Call 1-800-225-6292 or visit www.pioneerinvestments.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 (CDSC). The maximum CDSC is 4% and declines over five years. 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. Pioneer AMT-Free Municipal Fund was created through the reorganization of predecessor fund, Safeco Municipal Bond Fund, on December 10, 2004. The performance shown for Class B shares of the Fund for periods prior to December 10, 2004, is based on the performance of the predecessor fund's Class B shares, which has been restated to reflect differences in any applicable sales charges (but not differences in expenses). If all the expenses of the Fund were reflected, the performance would be lower. 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 taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 11 Performance Update | 12/31/10 Class C Shares Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer AMT-Free Municipal Fund, compared to that of the Barclays Capital Municipal Bond Index. Average Annual Total Returns (As of December 31, 2010) - ------------------------------------------------------------------ If If Period Held Redeemed - ------------------------------------------------------------------ Life-of-Class (10/1/2003) 2.74% 2.74% 5 Years 2.03 2.03 1 Year 1.26 1.26 - ------------------------------------------------------------------ Expense Ratio (Per prospectus dated May 1, 2010) - ------------------------------------------------------------------ Gross Net - ------------------------------------------------------------------ 1.64% 1.64% - ------------------------------------------------------------------ [The following data was represented as a mountain chart in the printed material] Value of $10,000 Investment Pioneer Barclays Capital AMT-Free Municipal Municipal Fund Bond Index 10/31/2003 $10,000 $10,000 12/31/2003 $10,210 $10,188 12/31/2004 $10,663 $10,644 12/31/2005 $11,065 $11,018 12/31/2006 $11,566 $11,552 12/31/2007 $11,643 $11,940 12/31/2008 $ 9,831 $11,645 12/31/2009 $12,086 $13,148 12/31/2010 $12,238 $13,461 Call 1-800-225-6292 or visit www.pioneerinvestments.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 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. "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. 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. Pioneer AMT-Free Municipal Fund was created through the reorganization of predecessor fund Safeco Municipal Bond Fund on December 10, 2004. The performance shown for Class C shares of the Fund for periods prior to December 10, 2004, is based on the performance of the predecessor fund's Class C shares, which has been restated to reflect differences in any applicable sales charges (but not differences in expenses). If all the expenses of the Fund were reflected, the performance would be lower. 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. 12 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 Performance Update | 12/31/10 Class Y Shares Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 million investment made in Pioneer AMT-Free Municipal Fund, compared to that of the Barclays Capital Municipal Bond Index. Average Annual Total Returns (As of December 31, 2010) - ------------------------------------------------------------------ If If Period Held Redeemed - ------------------------------------------------------------------ 10 Years 4.59% 4.59% 5 Years 3.05 3.05 1 Year 2.34 2.34 - ------------------------------------------------------------------ Expense Ratio (Per prospectus dated May 1, 2010) - ------------------------------------------------------------------ Gross Net - ------------------------------------------------------------------ 0.58% 0.55% - ------------------------------------------------------------------ [The following data was represented as a mountain chart in the printed material] Value of $5,000,000 Investment Pioneer Barclays Capital AMT-Free Municipal Municipal Fund Bond Index 12/31/2000 $5,000,000 $5,000,000 12/31/2001 $5,245,702 $5,256,283 12/31/2002 $5,768,944 $5,761,124 12/31/2003 $6,095,307 $6,067,232 12/31/2004 $6,427,647 $6,339,054 12/31/2005 $6,736,272 $6,561,806 12/31/2006 $7,089,276 $6,879,591 12/31/2007 $7,207,848 $7,110,725 12/31/2008 $6,158,125 $6,934,784 12/31/2009 $7,649,570 $7,830,313 12/31/2010 $7,828,477 $8,016,615 Call 1-800-225-6292 or visit www.pioneerinvestments.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. Pioneer AMT-Free Municipal Fund was created through the reorganization of predecessor Safeco Municipal Bond Fund on December 10, 2004. The performance shown for Class Y shares of the Fund for periods prior to December 10, 2004, is based on the net asset value performance of the predecessor fund's Class A shares prior to the reorganization, which has not been restated to reflect differences in expenses, including 12b-1 fees applicable to Class A shares. If all the expenses of the Fund were reflected, the performance would be lower. Performance shown for the period between December 10, 2004, and the inception of Class Y shares on November 10, 2006, reflects the NAV performance of the Pioneer AMT-Free Municipal Fund's Class A shares. The performance does not reflect differences in expenses, including the Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares are generally higher than those of Class Y shares, the performance for Class Y shares prior to its inception would have been higher than that shown. 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. 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 net expense ratio reflects the contractual expense limitation currently in effect through June 1, 2012, for Class Y shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please 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. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 13 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 [divided by] $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 AMT-Free Municipal Fund Based on actual returns from July 1, 2010, through December 31, 2010. - ------------------------------------------------------------------------------------- Share Class A B C Y - ------------------------------------------------------------------------------------- Beginning Account $ 1,000.00 $ 1,000.00 $ 1,000.00 $ 1,000.00 Value on 7/1/10 - ------------------------------------------------------------------------------------- Ending Account $ 979.86 $ 976.09 $ 975.72 $ 981.02 Value on 12/31/10 - ------------------------------------------------------------------------------------- Expenses Paid $ 4.09 $ 8.37 $ 7.97 $ 2.75 During Period* - ------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 0.82%, 1.68%, 1.60% and 0.55%, for Class A, Class B, Class C and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 184/365 (to reflect the one-half year period). 14 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 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 AMT-Free Municipal Fund Based on a hypothetical 5% per year return before expenses, reflecting the period from July 1, 2010, through December 31, 2010. - ------------------------------------------------------------------------------------- Share Class A B C Y - ------------------------------------------------------------------------------------- Beginning Account $ 1,000.00 $ 1,000.00 $ 1,000.00 $ 1,000.00 Value on 7/1/10 - ------------------------------------------------------------------------------------- Ending Account $ 1,021.07 $ 1,016.74 $ 1,017.14 $ 1,022.43 Value on 12/31/10 - ------------------------------------------------------------------------------------- Expenses Paid $ 4.18 $ 8.54 $ 8.13 $ 2.80 During Period* - ------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 0.82%, 1.68%, 1.60% and 0.55%, for Class A, Class B, Class C and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 184/365 (to reflect the one-half year period). Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 15 Schedule of Investments | 12/31/10 - ------------------------------------------------------------------------------------------------------------- Shares Value - ------------------------------------------------------------------------------------------------------------- COMMON STOCK -- 0.3% TRANSPORTATION -- 0.3% Airlines -- 0.3% 210,351 Delta Air Lines, Inc.* $ 2,650,423 ------------ TOTAL COMMON STOCK (Cost $4,839,425) $ 2,650,423 - ------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount($) (unaudited) (unaudited) - ------------------------------------------------------------------------------------------------------------- MUNICIPAL BONDS -- 99.4% Alabama -- 0.8% 5,000,000 NR/NR Alabama Drinking Water Finance Authority, 4.0%, 8/15/28 $ 4,225,500 2,000,000 A+/A1 Birmingham Alabama Waterworks & Sewer, 4.375%, 1/1/32 1,737,560 1,500,000 NR/NR Sylacauga Alabama Health Care Authority, 6.0%, 8/1/35 1,217,595 ------------ $ 7,180,655 - ------------------------------------------------------------------------------------------------------------- Arkansas -- 0.0% 250,000 A+/NR Arkansas State Development Finance Authority, 4.0%, 12/1/11 $ 257,705 ------------ $ 257,705 - ------------------------------------------------------------------------------------------------------------- Arizona -- 4.9% 5,565,000 AA-/Aa3 Arizona Board Regents Certificates Partnership, 4.0%, 6/1/31 $ 4,662,802 7,145,000 A+/NR Arizona Health Facilities Authority Revenue, 5.5%, 1/1/38 6,930,150 1,000,000 A/A1 Maricopa County Arizona, 5.0%, 6/1/35 930,680 6,080,000 AA/Aa2 Maricopa County Arizona High School District, 3.5%, 7/1/25 5,342,557 10,000,000 AA/Aa3 Phoenix Arizona Civic Import Corp., 5.5%, 7/1/43 8,136,200 4,000,000 AA/Aa3 Phoenix Arizona Civic Import Corp., District Revenue, 0.0%, 7/1/25 3,619,680 8,005,000 AA/Aa3 Phoenix Arizona Civic Import Corp., District Revenue, 0.0%, 7/1/26 7,154,469 530,000 NR/Baa3 Pima County Arizona Industrial, 6.375%, 7/1/31 473,905 959,000 NR/Baa3 Pima County Arizona Industrial Development Authority, 6.75%, 7/1/31 897,097 3,470,000 AA/Aa3 Pima County Industrial Development Authority, 5.0%, 7/1/20 3,701,206 500,000 BBB-/NR Pima County Industrial Development Authority, 6.1%, 6/1/45 418,260 ------------ $ 42,267,006 - ------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 16 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 - ----------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount($) (unaudited) (unaudited) Value - ----------------------------------------------------------------------------------------------------- California -- 18.6% 4,000,000 A/A3 Alameda Corridor Transportation Authority, 4.75%, 10/1/25 $ 3,811,920 3,500,000 A-/A2 Alameda County California Redevelopment Agency, 4.375%, 8/1/30 2,752,435 5,000,000 A/A1 Anaheim California Public Financing Authority Lease, 4.25%, 9/1/35 3,950,400 2,000,000 A/NR California Health Facilities Financing Authority, 5.0%, 3/1/33 1,772,060 2,000,000 A/A2 California Health Facilities, 5.625%, 7/1/32 2,002,760 4,000,000 BBB-/Baa2 California Municipal Finance Authority, 5.25%, 2/1/37 3,314,800 1,470,000 NR/Baa1 California Municipal Finance Authority, 5.875%, 10/1/34 1,400,337 565,000 AA+/Aa2 California State University Revenue, 5.0%, 11/1/39 544,095 20,000,000 A-/A1 California State, 4.25%, 8/1/33 16,038,000 10,000,000 AA-/A1 California Statewide, 5.75%, 7/1/47 9,712,100 4,875,000 NR/Baa2 California Statewide Communities Development Authority, 5.0%, 5/15/30 4,230,086 5,125,000 NR/Baa2 California Statewide Communities Development Authority, 5.0%, 5/15/38 4,266,511 20,955,000 BBB+/Baa2 California Statewide Communities Development Authority, 5.0%, 8/15/47 15,966,662 4,000,000 A-/NR California Statewide Communities Development Authority, 5.75%, 8/15/38 3,698,680 10,000,000 A+/Aa3 California Statewide Community, 5.25%, 11/15/48 8,954,600 19,340,000 AAA/Aaa Foothill/Eastern Corridor, 0.0%, 1/1/26 9,648,533 1,000,000 NR/Aa3 Franklin-McKinley California School District, 6.0%, 7/1/16 1,180,780 2,100,000 AA-/NR Fresno Joint Powers Financing Authority Lease Revenue, 4.75%, 9/1/28 2,036,349 15,000,000 BB+/Baa3 Golden State Tobacco Security Corp., California, 5.125%, 6/1/47 9,059,400 2,500,000 BBB+/Baa2 Inglewood California Redevelopment Agency Tax Allocation, 4.75%, 5/1/38 1,809,275 2,500,000 AA-/Aa2 Los Angeles California University School District, 4.25%, 1/1/28 2,158,700 3,000,000 A/A2 Long Beach California Finance Authority, 5.5%, 11/15/37 2,812,200 3,000,000 NR/NR Los Angeles County California Certificates of Participation, 4.75%, 3/1/23 2,842,650 The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 17 Schedule of Investments | 12/31/10 (continued) - -------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount($) (unaudited) (unaudited) Value - -------------------------------------------------------------------------------------------------------- California -- (continued) 3,000,000 A+/NR Los Angeles County Sanitation Districts Financing Authority Revenue, 4.5%, 10/1/35 $ 2,550,000 4,000,000 A-/NR Madera California Irrigation District Water, 5.5%, 1/1/33 3,885,760 3,680,000 A/Baa1 Madera California Public, 4.375%, 3/1/31 3,133,078 3,000,000 AA+/Aa3 Modesto California Wastewater Revenue, 4.25%, 11/1/36 2,455,170 1,785,000 AA+/Aa3 Oakland California University School District, 4.375%, 8/1/31 1,513,537 1,600,000 A+/NR Oxnard California School District, 4.375%, 8/1/33 1,357,936 7,000,000 BBB/NR Pittsburg California Redevelopment Agency, 6.5%, 9/1/28 7,427,910 3,815,000 BBB/NR Pittsburg California Redevelopment Agency, 4.25%, 9/1/34 2,767,248 2,180,000 A/Baa1 Pomona Unified School District, 6.55%, 8/1/29 2,401,161 2,095,000 A-/NR Redding California Redevelopment, 4.5%, 9/1/26 1,778,529 1,500,000 A-/NR Redding California Redevelopment, 5.0%, 9/1/36 1,283,790 3,000,000 A-/Aaa Rialto California Redevelopment Agency Tax Allocation, 6.25%, 9/1/37 2,868,750 2,500,000 A/A1 San Francisco California City & County Airports Common International, 4.5%, 5/1/32 2,219,775 10,865,000 A-/A2 San Jose California Redevelopment Agency Tax, 4.9%, 8/1/33 9,216,019 1,500,000 A/A1 Santa Cruz County California, Redevelopment Agency Tax Allocation, 6.625%, 9/1/29 1,579,035 1,505,000 A+/Aa3 Santa Maria California Joint, 0.0%, 8/1/27 504,551 3,600,000 A+/Aa2 Saugus California University School District, 0.0%, 8/1/23 1,670,688 ------------ $162,576,270 - -------------------------------------------------------------------------------------------------------- Colorado -- 3.2% 2,750,000 AA-/Aa3 Colorado Health Facilities Revenue, 5.25%, 11/15/35 $ 2,664,475 5,000 NR/Aa2 Colorado Housing Finance Authority, Series B-3, 6.55%, 5/1/25 5,046 5,555,000 A-/A3 Colorado Springs Colorado Hospital Revenue, 6.375%, 12/15/30 5,489,951 The accompanying notes are an integral part of these financial statements. 18 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 - ------------------------------------------------------------------------------------------------------ Floating S&P/Moody's Principal Rate (b) Ratings Amount($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------ Colorado -- (continued) 12,500,000 A/A2 Public Authority For Colorado Energy, 6.5%, 11/15/38 $ 13,147,625 1,250,000 NR/Baa3 Regional Transportation, 6.0%, 1/15/34 1,240,713 2,000,000 NR/Baa3 Regional Transportation, 6.5%, 1/15/30 2,092,460 2,500,000 NR/Baa3 Regional Transportation District, 6.0%, 1/15/26 2,530,675 1,000,000 NR/Baa3 Regional Transportation District, 6.0%, 1/15/41 979,530 ------------ $ 28,150,475 - ------------------------------------------------------------------------------------------------------ Connecticut -- 0.5% 1,000,000 NR/NR Connecticut State Health & Education, 5.5%, 7/1/17 $ 1,004,390 500,000 AAA/Aaa Connecticut State Health & Educational, 5.0%, 7/1/42 507,195 2,470,000 B+/NR Mohegan Tribe Indians Connecticut, 6.25%, 1/1/31 1,929,095 1,500,000 B+/NR Mohegan Tribe Indians Connecticut, 5.25%, 1/1/33 997,920 ------------ $ 4,438,600 - ------------------------------------------------------------------------------------------------------ District of Columbia -- 1.9% 10,000,000 BBB/Baa3 District of Columbia Tobacco Settlement Financing Corp., 6.75%, 5/15/40 $ 9,725,500 8,000,000 NR/A1 District of Columbia, 4.25%, 6/1/37 6,388,720 ------------ $ 16,114,220 - ------------------------------------------------------------------------------------------------------ Florida -- 6.0% 520,000 NR/NR County of Madison Florida, 6.0%, 7/1/25 $ 452,504 5,000,000 A-/A2 County of Miami-Dade, 5.5%, 10/1/41 4,850,300 1,000,000 NR/Aa2 Dade County Florida General, 7.7%, 10/1/12 1,111,420 8,000,000 AA/Aa1 Escambia County Florida Health Facilities, 5.25%, 11/15/32 8,018,480 3,000,000 NR/Baa1 Escambia County Health, 6.0%, 8/15/36 2,919,480 970,000 AA-/Aa3 Highlands County Health, 5.0%, 11/15/24 972,018 1,000,000 NR/A3 Hillsborough County Florida, 5.25%, 10/1/24 971,320 4,900,000 BB/NR Lee County Florida Industrial Development Authority, 4.75%, 6/15/14 4,849,236 2,000,000 BB/NR Lee County Florida Industrial Development Authority, 5.375%, 6/15/37 1,540,220 2,025,000 NR/NR Miami Beach Florida Health Facilities, 5.375%, 11/15/28 1,710,416 500,000 NR/Ba1 Miami Beach Health Facilities Authority, 6.7%, 11/15/19 502,295 The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 19 Schedule of Investments | 12/31/10 (continued) - ------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------- Florida -- (continued) 2,605,000 NR/NR State Johns County Industrial, 5.875%, 8/1/40 $ 2,531,930 3,400,000 NR/NR State Johns County Industrial, 6.0%, 8/1/45 3,327,070 7,500,000 NR/Baa1 Tallahassee Florida Health, 6.375%, 12/1/30 7,370,925 13,780,000 A-/A3 Tampa-Hillsborough County Florida, 4.0%, 7/1/34 11,181,368 ------------ $ 52,308,982 - ------------------------------------------------------------------------------------------------------- Georgia -- 1.4% 5,750,000 A/Baa1 Burke County Development, 7.0%, 1/1/23 $ 6,616,180 5,000,000 A+/A2 Main Street Natural Gas, Inc., Georgia, 5.5%, 9/15/28 4,792,200 1,000,000 NR/A2 Houston County Georgia Hospital Authority Revenue, 5.0%, 10/1/42 888,390 ------------ $ 12,296,770 - ------------------------------------------------------------------------------------------------------- Illinois -- 4.5% 4,000,000 NR/CAA1 Chicago Illinois O'Hare International Airport, 5.5%, 12/1/30 $ 3,250,280 4,580,000 NR/A3 Illinois Development Finance Authority Revenue, 5.25%, 10/1/24 4,615,220 5,000,000 NR/Baa2 Illinois Finance Authority, 6.5%, 4/1/39 5,115,750 1,000,000 BBB+/NR Illinois Finance Authority, 5.25%, 5/1/40 916,250 2,000,000 AA+/Aa3 Illinois Finance Authority, 6.0%, 8/15/25 2,049,180 1,000,000 NR/NR Illinois Finance Authority, 6.125%, 5/15/27 926,420 4,000,000 BBB/NR Illinois Finance Authority, 5.5%, 8/15/30 3,642,120 10,000,000 AAA/A2 Metropolitan Pier & Expo, 5.25%, 6/15/42 9,235,500 5,000,000 AAA/Aaa Metropolitan Pier & Expo, 7.0%, 7/1/26 6,515,350 20,000,000 0.00 AAA/A2 Metropolitan Pier & Exposition Authority Illinois Dedicated State Tax, Floating Rate Note, 6/15/39 3,066,200 ------------ $ 39,332,270 - ------------------------------------------------------------------------------------------------------- Indiana -- 2.8% 2,000,000 AA/NR Indiana Bond Bank, 5.5%, 2/1/29 $ 2,068,420 1,000,000 A-/NR Indiana Finance Authority, 5.125%, 3/1/30 924,620 1,000,000 A-/NR Indiana Finance Authority, 5.375%, 3/1/34 932,870 2,000,000 BB/Ba2 Indiana Finance Authority, 6.0%, 12/1/26 1,924,980 5,000,000 A+/A1 Indiana Health & Educational Facilities Authority, 4.75%, 2/15/34 4,364,550 The accompanying notes are an integral part of these financial statements. 20 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 - --------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount($) (unaudited) (unaudited) Value - --------------------------------------------------------------------------------------------------- Indiana -- (continued) 8,000,000 A+/A1 Indiana Health & Educational Facilities Authority, 5.0%, 2/15/39 $ 7,157,680 4,135,000 BBB-/NR Indiana State Development Finance, 5.75%, 10/1/11 4,169,403 1,180,000 AA/NR Indianapolis Local Public Improvement Board Revenue, 6.75%, 2/1/14 1,262,671 500,000 AA/Aa1 Indianapolis Local Public Improvement Board Revenue, 6.0%, 1/10/20 569,585 1,000,000 BBB+/Aa3 Lawrence Township Metropolitan School District Revenue, 6.75%, 7/5/13 1,072,570 ------------ $ 24,447,349 - --------------------------------------------------------------------------------------------------- Kentucky -- 0.1% 435,000 NR/NR Kentucky Economic Development Finance, 6.625%, 10/1/28 $ 437,640 ------------ $ 437,640 - --------------------------------------------------------------------------------------------------- Louisiana -- 2.4% 10,000,000 NR/Baa1 Louisiana Public Facilities Authority, 5.5%, 5/15/47 $ 8,450,200 5,000,000 AA/Aa1 Louisiana State Gas & Fuels Tax, 4.5%, 5/1/41 4,510,650 1,085,000 NR/NR Louisiana Local Government Environment Community, 5.25%, 12/1/18 1,071,145 8,000,000 BBB+/Baa1 State John Baptist Parish Louisiana Revenue, 5.125%, 6/1/37 7,256,160 ------------ $ 21,288,155 - --------------------------------------------------------------------------------------------------- Massachusetts -- 7.3% 4,000,000 NR/Aa2 City of Pittsfield Massachusetts, 5.0%, 3/1/19 $ 4,484,960 450,000 BBB/Baa2 Massachusetts Development Finance Agency, 5.15%, 10/1/14 462,524 1,680,000 BBB/NR Massachusetts Development Finance Agency, 5.25%, 10/1/29 1,533,857 3,320,000 BBB/NR Massachusetts Development Finance Agency, 5.25%, 10/1/37 2,918,114 1,100,000 BBB/Baa2 Massachusetts Development Finance Agency, 5.625%, 10/1/24 1,065,834 1,000,000 BBB/Baa2 Massachusetts Development Finance Agency, 5.7%, 10/1/34 919,570 2,635,000 NR/NR Massachusetts Development Finance Agency, 6.25%, 10/15/17 2,556,214 1,000,000 BBB/NR Massachusetts Development Finance Agency, 7.0%, 7/1/42 1,018,730 The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 21 Schedule of Investments | 12/31/10 (continued) - ---------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount($) (unaudited) (unaudited) Value - ---------------------------------------------------------------------------------------------------- Massachusetts -- (continued) 4,750,000 BBB+/Baa1 Massachusetts Health & Educational Facilities Authority Revenue, 6.625%, 7/1/32 $ 4,770,188 1,145,000 BBB+/NR Massachusetts Health & Educational Facilities Authority, 6.25%, 10/1/31 1,146,008 2,150,000 NR/Baa2 Massachusetts Health & Educational Facilities Authority, 6.25%, 7/1/22 2,342,554 2,000,000 BBB+/Baa1 Massachusetts Health & Educational Facilities Authority, 6.5%, 7/1/21 2,016,600 2,500,000 BB-/NR Massachusetts Health & Educational Facilities, 5.5%, 7/1/40 1,789,550 2,335,000 BBB-/Baa3 Massachusetts Health & Educational, 5.375%, 7/1/35 2,182,945 2,000,000 BBB+/NR Massachusetts Health, 5.25%, 7/1/38 1,782,000 500,000 BBB-/NR Massachusetts State Development Finance Agency, 5.5%, 1/1/35 422,580 3,990,000 A/NR Massachusetts State Development Finance Agency, 5.75%, 1/1/42 4,030,499 1,600,000 BBB/NR Massachusetts State Health & Educational Facilities Authority, 5.45%, 11/15/23 1,493,184 4,500,000 NR/NR Massachusetts State Health & Educational, 4.625%, 8/15/28 3,474,450 1,550,000 BBB-/Baa3 Massachusetts State Health & Educational, 5.25%, 7/15/18 1,539,507 40,000 AA/Aa2 Massachusetts State Health & Educational, 6.0%, 7/1/18 41,188 200,000 AA/Aa2 Massachusetts State Health and Educational Facilities, 5.75%, 7/1/32 202,344 3,750,000 BBB+/Baa1 Massachusetts State Health, 5.25%, 7/1/38 3,157,238 14,675,000 BBB/Baa1 Massachusetts State Housing Finance Agency, 5.4%, 12/1/28 14,104,436 4,130,000 AA+/Aa1 Massachusetts State Water Authority, 4.0%, 8/1/46 3,393,910 900,000 AAA/Aaa Massachusetts Water Pollution Abatement, Revenue, 3.5%, 8/1/26 825,552 ------------ $ 63,674,536 - ---------------------------------------------------------------------------------------------------- Maryland -- 1.1% 3,000,000 BB+/Ba1 Frederick County Maryland, 5.625%, 9/1/38 $ 2,619,780 2,000,000 A/A3 Maryland Economic Development Corp., 6.2%, 1/9/22 2,252,340 1,000,000 BB/NR Maryland Economic Development, 5.75%, 9/1/25 951,420 2,000,000 NR/Baa3 Maryland Health, 5.75%, 7/1/38 1,753,680 The accompanying notes are an integral part of these financial statements. 22 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 - ------------------------------------------------------------------------------------------------------ Floating S&P/Moody's Principal Rate (b) Ratings Amount($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------ Maryland -- (continued) 1,000,000 NR/NR Maryland State Economic Development, 5.0%, 12/1/16 $ 838,100 560,000 NR/NR Maryland State Economic Development, 5.0%, 12/1/16 469,336 1,000,000 NR/NR Maryland State Economic Development, 5.0%, 12/1/31 636,670 ------------ $ 9,521,326 - ------------------------------------------------------------------------------------------------------ Michigan -- 1.8% 3,000,000 AA+/NR Detroit Michigan Sewer District, 6.25%, 7/1/36 $ 3,197,250 1,500,000 BB/NR John Tolfree Health System, 6.0%, 9/15/23 1,222,875 1,490,000 NR/NR Meridian Michigan Economic Development Corridor, 5.25%, 7/1/26 1,255,683 3,340,000 NR/NR Michigan Public Educational Facilities Authority Revenue, 5.875%, 6/1/37 2,579,148 2,000,000 NR/NR Michigan State Hospital Finance Authority, 5.25%, 11/15/25 1,692,660 1,000,000 NR/NR Michigan State Hospital Finance Authority, 5.5%, 11/15/35 805,420 5,000,000 AA/Aa1 Michigan State Hospital Finance Authority, 5.5%, 11/15/26 5,058,050 6,485,000 NR/NR Wayne Charter Escrow, 12/1/15 (c) -- ------------ $ 15,811,086 - ------------------------------------------------------------------------------------------------------ Minnesota -- 0.7% 5,000,000 A/A1 Becker Minnesota Pollution Control Revenue Northern States Power "A" Conversions, 8.5%, 4/1/30 $ 5,318,650 1,000,000 NR/NR City of Winsted MN, 6.5%, 9/1/34 892,900 ------------ $ 6,211,550 - ------------------------------------------------------------------------------------------------------ Missouri -- 0.0% 80,000 NR/Aaa Missouri State Environmental Improvement & Energy Resources, 5.125%, 1/1/20 $ 84,991 ------------ $ 84,991 - ------------------------------------------------------------------------------------------------------ Mississippi -- 1.5% 1,800,000 NR/NR Columbus Mississippi Industrial Development Revenue, 5.9%, 12/1/11 $ 1,787,202 2,750,000 BBB/Baa3 County of Warren Mississippi, 5.8%, 5/1/34 2,754,840 7,950,000 BBB-/Ba1 Lowndes County Mississippi Solid Waste Disposal & Pollution Control Revenue, 6.8%, 4/1/22 8,331,203 ------------ $ 12,873,245 - ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 23 Schedule of Investments | 12/31/10 (continued) - ------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------- Montana -- 0.3% 2,785,000 A-/Baa1 Forsyth Montana Pollution Control Revenue, 5.0%, 3/1/31 $ 2,640,737 ------------ $ 2,640,737 - ------------------------------------------------------------------------------------------------------- North Carolina -- 1.9% 1,000,000 NR/NR North Carolina Capital Facilities Finance Agency Student Revenue, 5.0%, 6/1/27 $ 836,590 1,000,000 NR/NR North Carolina Capital Facilities Finance Agency Student Revenue, 5.0%, 6/1/32 804,200 2,000,000 NR/NR North Carolina Capital Facilities Finance, 4.5%, 10/1/26 1,536,740 12,000,000 A-/Baa1 North Carolina Eastern Municipal Power, 6.0%, 1/1/22 13,648,920 ------------ $ 16,826,450 - ------------------------------------------------------------------------------------------------------- New Hampshire -- 1.4% 3,750,000 A-/NR New Hampshire Health & Educational Facilities, 5.0%, 10/1/17 $ 3,325,950 5,000,000 A-/NR New Hampshire Health & Education Facilities, 5.0%, 10/1/32 4,531,700 2,250,000 A+/A2 New Hampshire Health & Education Facilities Authority Revenue, 5.75%, 10/1/31 2,277,675 2,000,000 BBB+/Baa1 New Hampshire Health & Educational Facilities Authority Revenue, 5.75%, 7/1/22 1,976,840 ------------ $ 12,112,165 - ------------------------------------------------------------------------------------------------------- New Jersey -- 2.8% 1,250,000 BBB/Baa3 Camden County New Jersey Import Authority, 5.75%, 2/15/34 $ 1,161,050 475,000 NR/NR New Jersey Economic Development Authority, 5.3%, 11/1/26 401,622 450,000 NR/NR New Jersey Economic Development Authority, 5.375%, 11/1/36 347,558 610,000 NR/NR New Jersey Economic Development Authority, 5.75%, 1/1/25 557,888 700,000 BB/Ba3 New Jersey Health Care Facilities, 5.125%, 7/1/14 682,318 30,000,000 AA+/Aa1 New Jersey Transportation, 0.0%, 12/15/27 10,956,000 5,115,000 BBB-/Baa3 New Jersey Health Care Facilities Financing Authority, 5.25%, 7/1/30 4,480,433 3,500,000 NR/NR New Jersey Health Care Facilities Financing Authority, 7.25%, 7/1/27 2,746,275 4,500,000 BB-/Baa3 Tobacco Settlement Financing Corp., 5.0%, 6/1/41 2,661,165 ------------ $ 23,994,309 - ------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 24 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 - ---------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount($) (unaudited) (unaudited) Value - ---------------------------------------------------------------------------------------------------- New Mexico -- 0.1% 1,000,000 A-/NR Dona Ana County New Mexico Pilt Revenue, 5.25%, 12/1/25 $ 976,720 ------------ $ 976,720 - ---------------------------------------------------------------------------------------------------- Nevada -- 0.5% 5,000,000 A-/A3 Reno Nevada Hospital Revenue, 5.25%, 6/1/41 $ 4,402,550 ------------ $ 4,402,550 - ---------------------------------------------------------------------------------------------------- New York -- 3.1% 2,500,000 BBB+/Baa2 Albany Individual Development, 5.25%, 11/15/32 $ 2,233,975 1,000,000 NR/B3 Albany Individual Development, 6.0%, 7/1/19 841,730 5,750,000 AAA/Aa1 New York City Municipal Finance Water & Sewer System Revenue, 4.25%, 6/15/39 5,105,310 5,515,000 BBB/NR New York State Dormitory Authority, 5.24%, 7/1/24 5,562,815 1,295,000 AA-/Aa3 New York State Dormitory Authority Revenue, 7.5%, 5/15/11 1,328,178 5,250,000 AA-/Aa3 New York State Dormitory Authority Revenue, 7.5%, 5/15/13 5,975,340 1,000,000 BBB-/Baa3 Port Authority of New York & New Jersey, 6.0%, 12/1/36 987,000 3,400,000 BBB-/Baa3 Port Authority of New York & New Jersey, 6.0%, 12/1/42 3,353,182 1,500,000 AA-/Aa2 Port Authority of New York & New Jersey, Ninety Third Series, 6.125%, 6/1/94 1,693,275 ------------ $ 27,080,805 - ---------------------------------------------------------------------------------------------------- Ohio -- 2.8% 6,000,000 BB-/Baa3 Buckeye Ohio Tobacco Settlement, 6.5%, 6/1/47 $ 4,305,060 10,000,000 BB-/Baa3 Buckeye Tobacco Settlement, 5.75%, 6/1/34 6,811,600 6,840,000 BB-/Baa3 Buckeye Tobacco Settlement Finance, 5.125%, 6/1/24 5,267,621 1,500,000 NR/NR Cuyahoga County Ohio Health, 6.0%, 5/15/37 1,296,420 1,500,000 NR/NR Cuyahoga County Ohio Health, 6.0%, 5/15/37 1,296,840 5,000,000 NR/Baa1 Lake County Ohio Hospital Municipal, 6.0%, 8/15/43 5,017,750 ------------ $ 23,995,291 - ---------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 25 Schedule of Investments | 12/31/10 (continued) - ------------------------------------------------------------------------------------------------------ Floating S&P/Moody's Principal Rate (b) Ratings Amount($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------ Oklahoma -- 1.9% 5,590,000 BBB/Baa1 McGee Creek Authority Water Revenue, 6.0%, 1/1/23 $ 6,061,405 9,055,000 BBB+/A3 Tulsa Airports Improvement Trust, 7.05%, 6/1/17 10,517,564 ------------ $ 16,578,969 - ------------------------------------------------------------------------------------------------------ Oregon -- 0.0% 185,000 BB+/NR Klamath Falls Inter-Community Hospital Authority Revenue, 6.125%, 9/1/22 $ 169,186 ------------ $ 169,186 - ------------------------------------------------------------------------------------------------------ Pennsylvania -- 5.5% 3,000,000 BB-/B1 Allegheny County Pennsylvania Hospital Development Authority, 5.375%, 11/15/40 $ 2,011,800 3,000,000 NR/Ca Allentown Pennsylvania Area Hospital Authority, 6.0%, 11/15/16 2,820,180 1,000,000 CCC/NR Columbia County Pennsylvania Hospital Authority, 5.8%, 6/1/19 927,690 10,000,000 A-/Baa2 Lehigh County Pennsylvania Industrial Development Authority Pollution Control, 4.75%, 2/15/27 9,275,000 1,000,000 BBB/NR Montgomery County Pennsylvania Industrial, 5.0%, 12/1/24 933,410 1,000,000 BBB/NR Montgomery County Pennsylvania Industrial, 5.0%, 12/1/30 881,450 5,000,000 BBB+/A3 Northampton County Pennsylvania General Purpose Authority Revenue, 5.5%, 8/15/40 4,622,850 11,500,000 0.82 BBB/NR Pennsylvania State Higher Education Floating Rate Note, 7/1/39 5,983,565 2,000,000 NR/NR Pennsylvania Economic Development Financing Authority, 5.0%, 12/1/43 1,943,320 1,000,000 BBB-/Baa3 Pennsylvania Higher Educational, 6.0%, 7/1/43 940,380 1,000,000 BBB-/Baa3 Pennsylvania Higher Educational Facilities Authority, 5.0%, 7/1/42 851,760 6,000,000 AA/Aa2 Philadelphia Pennsylvania Hospital, 4.5%, 7/1/37 5,336,400 12,900,000 BBB/Baa3 Philadelphia Pennsylvania Hospital, 5.0%, 7/1/34 10,625,472 1,000,000 AA+/Aa3 Pittsburgh & Allegheny County, 5.0%, 2/1/30 951,530 65,000 A+/NR Sayre Pennsylvania Health Care Facilities Authority, 5.75%, 12/1/21 66,210 ------------ $ 48,171,017 - ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 26 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 - ------------------------------------------------------------------------------------------------------ Floating S&P/Moody's Principal Rate (b) Ratings Amount($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------ Puerto Rico -- 1.1% 1,500,000 AA+/Aa3 Puerto Rico Highway, 4.95%, 7/1/26 $ 1,477,680 75,000 NR/NR Puerto Rico Public Buildings Authority Revenue, 5.25%, 7/1/33 84,419 925,000 BBB-/A3 Puerto Rico Public Buildings Authority Revenue, 5.25%, 7/1/33 869,250 7,000,000 AA-/Aa2 Puerto Rico Sales Tax, 0.0%, 8/1/40 1,052,030 5,000,000 AA-/Aa2 Puerto Rico Sales Tax Financing, 5.25%, 8/1/57 4,917,650 20,000,000 AA-/Aa2 Puerto Rico Sales Tax Financing, 0.0%, 11/15/27 1,029,600 ------------ $ 9,430,629 - ------------------------------------------------------------------------------------------------------ Rhode Island -- 0.5% 65,000 A-/A3 Rhode Island State Health & Educational Building Corp., 6.375%, 8/15/21 $ 66,575 5,200,000 BBB/Baa3 Tobacco Settlement Financing Corp., 6.25%, 6/1/42 4,664,504 ------------ $ 4,731,079 - ------------------------------------------------------------------------------------------------------ South Dakota -- 0.0% 65,000 NR/Aaa South Dakota Conservancy District Revenue, 5.625%, 8/1/17 $ 65,256 ------------ $ 65,256 - ------------------------------------------------------------------------------------------------------ Tennessee -- 0.7% 1,000,000 BBB+/Baa1 Johnson City Tennessee Health & Education, 5.5%, 7/1/36 $ 892,170 1,000,000 NR/A1 Knox County Health Facility, 6.375%, 4/15/22 1,059,010 4,000,000 NR/A1 Knox County Health Facility, 6.5%, 4/15/31 4,202,240 ------------ $ 6,153,420 - ------------------------------------------------------------------------------------------------------ Texas -- 5.9% 1,500,000 AAA/NR Anna Independent School District, 5.0%, 8/15/50 $ 1,506,735 4,275,000 AAA/Aaa City of Austin Texas, 3.375%, 9/1/29 3,374,300 1,500,000 AAA/Aaa County of Harris Texas, 5.0%, 10/1/24 1,619,655 2,695,000 AAA/Aaa Crowley Texas Independent School District, 3.5%, 8/1/36 2,125,493 14,000,000 BBB+/A3 Dallas County Texas Utilities & Reclamation, 5.375%, 2/15/29 13,157,900 10,000,000 CCC+/CAA1 Dallas-Fort Worth Texas International Airport, 6.0%, 11/1/14 9,638,500 2,000,000 A/Baa3 Greater Greenspoint Redevelopment Authority, 4.875%, 9/1/28 1,823,860 The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 27 Schedule of Investments | 12/31/10 (continued) - ----------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount($) (unaudited) (unaudited) Value - ----------------------------------------------------------------------------------------------------- Texas -- (continued) 20,000 NR/A1 Lower Colorado River Authority, 5.25%, 5/15/21 $ 21,751 3,000,000 BBB-/Baa2 Richardson Texas Hospital Authority, 6.0%, 12/1/34 2,692,170 1,000,000 BBB/NR Seguin Texas Higher Educational Facilities, 5.0%, 9/1/23 949,490 10,410,000 NR/Baa3 Texas Private Activities, 7.0%, 6/30/40 10,539,500 3,255,000 BBB/NR Texas State Public Finance Authority, 6.2%, 2/15/40 3,123,693 950,000 6.20 AA+/NR Texas State, Floating Rate Note, 9/30/11 1,016,291 20,000 NR/Aaa Whitehouse Texas Independent School District, 4.8%, 2/15/12 20,067 ------------ $ 51,609,405 - ----------------------------------------------------------------------------------------------------- Utah -- 0.1% 500,000 BBB-/NR Utah State Charter Schools, 5.75%, 7/15/20 $ 479,800 ------------ $ 479,800 - ----------------------------------------------------------------------------------------------------- Virginia -- 3.6% 10,000,000 BBB/Baa1 Chesapeake Bay Bridge and Tunnel Common Virginia Revenue, 5.5%, 7/1/25 $ 9,960,500 1,500,000 NR/Baa1 Prince William County Virginia Industrial Development Authority Hospital Revenue, 5.2%, 10/1/26 1,403,625 3,925,000 NR/Baa1 Prince William County Virginia Industrial Development Authority Hospital Revenue, 5.35%, 10/1/36 3,530,655 13,990,000 BB-/Baa3 Tobacco Settlement Financing Corp., 5.0%, 6/1/47 8,162,745 7,500,000 BBB+/Baa1 Washington County Industrial, 7.75%, 7/1/38 8,284,275 ------------ $ 31,341,800 - ----------------------------------------------------------------------------------------------------- Vermont -- 0.1% 1,295,000 NR/NR Vermont Educational & Health Buildings, 5.0%, 7/1/24 $ 1,028,243 ------------ $ 1,028,243 - ----------------------------------------------------------------------------------------------------- Washington -- 6.4% 5,755,000 A+/NR Centralia Washington Electric Revenue, 4.25%, 12/1/26 $ 5,290,802 10,000,000 AA/NR FYI Properties, 5.5%, 6/1/39 10,256,700 10,850,000 AAA/NR King County Washington Housing Authority, 5.5%, 5/1/38 10,931,484 3,000,000 A+/Aa3 King County Washington Public Hospital, 5.25%, 12/1/37 2,957,310 The accompanying notes are an integral part of these financial statements. 28 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 - ----------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount($) (unaudited) (unaudited) Value - ----------------------------------------------------------------------------------------------------- Washington -- (continued) 2,906,000 AA+/NR Seattle Washington Housing Authority, 6.6%, 8/20/38 $ 2,923,087 10,500,000 BBB/Baa3 Tobacco Settlement Authority Washington, 6.625%, 6/1/32 10,328,325 6,290,000 NR/NR Vancouver Washington Housing Authority, 5.65%, 3/1/31 4,979,541 1,500,000 NR/Baa2 Washington Health Care Facilities Authority, 5.25%, 12/1/30 1,347,690 2,500,000 NR/NR Washington State Housing, 5.25%, 1/1/17 2,154,850 5,000,000 AAA/Aa2 Washington State Health Care Facilities, 5.25%, 10/1/33 4,947,200 ------------ $ 56,116,989 - ----------------------------------------------------------------------------------------------------- Wisconsin -- 1.2% 1,430,000 NR/A1 Adams-Friendship School District, 6.5%, 4/1/16 $ 1,697,562 2,000,000 NR/A3 Wisconsin Health & Educational, 5.625%, 4/15/39 1,913,980 3,000,000 A+/NR Wisconsin Health & Educational Facilities Authority, 5.125%, 8/15/35 2,773,020 4,505,000 NR/A3 Wisconsin State Health & Educational Facilities Authority, 5.6%, 2/15/29 4,459,184 ------------ $ 10,843,746 - ----------------------------------------------------------------------------------------------------- TOTAL MUNICIPAL BONDS (Cost $915,570,928) $868,021,397 - ----------------------------------------------------------------------------------------------------- TOTAL INVESTMENT IN SECURITIES -- 99.7% (Cost $920,410,353) (a) $870,671,820 - ----------------------------------------------------------------------------------------------------- OTHER ASSETS AND LIABILITIES -- 0.3% $ 2,239,159 - ----------------------------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $872,910,979 ===================================================================================================== NR Not rated by either S&P or Moody's. * Non-income producing security. The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 29 Schedule of Investments | 12/31/10 (continued) (a) At December 31, 2010, the net unrealized loss on investments based on cost for federal income tax purposes of $918,314,766 was as follows: Aggregate gross unrealized loss for all investments in which there is an excess of value over tax cost $ 17,828,207 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (65,471,153) ------------ Net unrealized loss $(47,642,946) ============ (b) Debt obligation with a variable interest rate. Rate shown is rate at period end. (c) Security is fair valued by management. (See note 1A) Purchases and sales of securities (excluding temporary cash investments) for the year ended December 31, 2010 aggregated $145,654,167 and $175,804,687, respectively. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. Highest priority is given to Level 1 inputs and lowest priority is given to Level 3. Level 1 -- quoted prices in active markets for identical securities Level 2 -- other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.) Level 3 -- significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) The following is a summary of the inputs used as of December 31, 2010, in valuing the Fund's assets: - ------------------------------------------------------------------------------ Level 1 Level 2 Level 3 Total - ------------------------------------------------------------------------------ Common Stock $2,650,423 $ -- $-- $ 2,650,423 Municipal Bonds -- 868,021,397 -- 868,021,397 - ------------------------------------------------------------------------------ Total $2,650,423 $868,021,397 $-- $870,671,820 ============================================================================== Following is a reconciliation of assets using significant unobservable inputs (Level 3): - ------------------------------------------------------------------ Municipal Bonds - ------------------------------------------------------------------ Balance as of 12/31/09 $ -- Realized gain (loss)(1) -- Change in unrealized appreciation (depreciation)(2) -- Net purchases (sales) -- Transfers in and out of Level 3 -- -------- Balance as of 12/31/10 $ -- ======== 1 Realized gain (loss) on these securities is Included in the net realized gain (loss) from investments in the Statement of Operations. 2 Unrealized appreciation (depreciation) on these securities is Included in the change in unrealized gain (loss) on investments in the Statement of Operations. Net change in unrealized depreciation of investments still held as of 12/31/10 $ -- ======== The accompanying notes are an integral part of these financial statements. 30 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 Statement of Assets and Liabilities | 12/31/10 ASSETS: Investment in securities, at value (cost $920,410,353) $ 870,671,820 Receivables -- Investment securities sold 5,000 Fund shares sold 314,670 Interest 13,274,304 Due from Pioneer Investment Management, Inc. 38,548 Other 42,467 - -------------------------------------------------------------------------- Total assets $ 884,346,809 - -------------------------------------------------------------------------- LIABILITIES: Payables -- Fund shares repurchased $ 5,214,949 Dividends 1,089,917 Due to bank 4,929,891 Due to affiliates 82,266 Accrued expenses 118,807 - -------------------------------------------------------------------------- Total liabilities $ 11,435,830 - -------------------------------------------------------------------------- NET ASSETS: Paid-in capital $1,031,510,258 Undistributed net investment income 3,781,709 Accumulated net realized loss on investments (112,642,455) Net unrealized loss on investments (49,738,533) - -------------------------------------------------------------------------- Total net assets $ 872,910,979 ========================================================================== NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Class A (based on $749,234,921/59,629,868 shares) $ 12.56 Class B (based on $8,169,588/654,654 shares) $ 12.48 Class C (based on $38,547,662/3,092,887 shares) $ 12.46 Class Y (based on $76,958,808/6,139,583 shares) $ 12.53 MAXIMUM OFFERING PRICE: Class A ($12.56 [divided by] 95.50%) $ 13.15 ========================================================================== The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 31 Statement of Operations For the Year Ended 12/31/10 INVESTMENT INCOME: Interest $47,043,447 - ----------------------------------------------------------------------------------------- Total investment income $ 47,043,447 - ----------------------------------------------------------------------------------------- EXPENSES: Management fees $ 3,984,636 Transfer agent fees Class A 339,738 Class B 9,268 Class C 11,430 Class Y 2,205 Distribution fees Class A 1,883,965 Class B 102,059 Class C 388,437 Shareholder communication expense 212,866 Administrative reimbursements 276,706 Custodian fees 16,961 Registration fees 93,994 Professional fees 110,242 Printing expense 63,485 Fees and expenses of nonaffiliated trustees 24,412 Miscellaneous 109,396 - ----------------------------------------------------------------------------------------- Total expenses $ 7,629,800 Less fees waived and expenses reimbursed by Pioneer Investment Management, Inc. $ (255,602) - ----------------------------------------------------------------------------------------- Net expenses $ 7,374,198 - ----------------------------------------------------------------------------------------- Net investment income $ 39,669,249 - ----------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS: Net realized gain on investments $ 436,709 - ----------------------------------------------------------------------------------------- Change in net unrealized gain on investments $(25,243,454) - ----------------------------------------------------------------------------------------- Net loss on investments $(24,806,745) - ----------------------------------------------------------------------------------------- Net increase net assets resulting from operations $ 14,862,504 ========================================================================================= The accompanying notes are an integral part of these financial statements. 32 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 Statement of Changes in Net Assets For the Years Ended 12/31/10 and 12/31/09, respectively - ------------------------------------------------------------------------------------------- Year Ended Year Ended 12/31/10 12/31/09 - ------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income $ 39,669,249 $ 23,906,163 Net realized gain (loss) on investments 436,709 (9,884,318) Change in net unrealized gain (loss) on investments (25,243,454) 86,797,248 - ------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 14,862,504 $100,819,093 - ------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Net investment income: Class A ($0.59 and $0.61 per share, respectively) $(33,704,074) $(21,744,438) Class B ($0.47 and $0.50 per share, respectively) (366,881) (245,171) Class C ($0.48 and $0.50 per share, respectively) (1,434,829) (888,890) Class Y ($0.63 and $0.63 per share, respectively) (3,453,900) (1,096,135) Net realized gain: Class A ($0.00 and $0.01 per share, respectively) -- (179,999) Class B ($0.00 and $0.01 per share, respectively) -- (2,201) Class C ($0.00 and $0.01 per share, respectively) -- (9,574) Class Y ($0.00 and $0.01 per share, respectively) -- (9,025) - ------------------------------------------------------------------------------------------- Total distributions to shareowners $(38,959,684) $(24,175,433) - ------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sale of shares $ 98,299,947 $ 56,636,262 Shares issued in reorganization 417,600,371 73,975,006 Reinvestment of distributions 25,956,811 15,054,845 Cost of shares repurchased (178,670,277) (80,759,552) - ------------------------------------------------------------------------------------------- Net increase in net assets resulting from Fund share transactions $363,186,852 $ 64,906,561 - ------------------------------------------------------------------------------------------- Net increase in net assets $339,089,672 $141,550,221 NET ASSETS: Beginning of year 533,821,307 392,271,086 - ------------------------------------------------------------------------------------------- End of year $872,910,979 $533,821,307 - ------------------------------------------------------------------------------------------- Undistributed net investment income $ 3,781,709 $ 3,069,261 - ------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 33 Statement of Changes in Net Assets (continued) - ----------------------------------------------------------------------------------------------------- '10 Shares '10 Amount '09 Shares '09 Amount - ----------------------------------------------------------------------------------------------------- Class A Shares sold 4,845,878 $ 64,335,468 3,355,816 $40,839,914 Reinvestment of distributions 1,831,779 24,130,823 1,176,375 14,458,732 Shares issued in reorganization of Pioneer AMT-Free CA Municipal Fund -- -- 5,703,207 68,324,416 Shares issued in reorganization of Pioneer Intermediate Tax Free Income Fund 594,920 7,710,163 -- -- Shares issued in reorganization of Pioneer Tax Free Income Fund 25,471,046 330,104,753 -- -- Less shares repurchased (10,393,855) (136,128,850) (5,362,126) (66,299,212) - ----------------------------------------------------------------------------------------------------- Net increase 22,349,768 $290,152,357 4,873,272 $57,323,850 ===================================================================================================== Class B Shares sold 48,182 $ 636,415 79,753 $ 951,989 Reinvestment of distributions 20,361 266,522 8,871 107,840 Shares issued in reorganization of Pioneer AMT-Free CA Municipal Fund -- -- 65,510 779,574 Shares issued in reorganization of Pioneer Tax Free Income Fund 605,286 7,790,030 -- -- Less shares repurchased (475,982) (6,224,798) (185,481) (2,273,278) - ----------------------------------------------------------------------------------------------------- Net increase (decrease) 197,847 $ 2,468,169 (31,347) $ (433,875) ===================================================================================================== Class C Shares sold 694,754 $ 9,078,265 612,081 $ 7,427,598 Reinvestment of distributions 67,132 877,730 34,716 424,409 Shares issued in reorganization of Pioneer AMT-Free CA Municipal Fund -- -- 409,673 4,871,016 Shares issued in reorganization of Pioneer Intermediate Tax Free Income Fund 5,168 66,460 -- -- Shares issued in reorganization of Pioneer Tax Free Income Fund 1,066,656 13,717,192 -- -- Less shares repurchased (810,400) (10,487,121) (386,538) (4,717,655) - ----------------------------------------------------------------------------------------------------- Net increase 1,023,310 $ 13,252,526 669,932 $ 8,005,368 ===================================================================================================== Class Y Shares sold 1,849,946 $ 24,249,799 599,149 $ 7,416,761 Reinvestment of distributions 51,891 681,736 5,216 63,864 Shares issued in reorganization of Pioneer Intermediate Tax Free Income Fund 626,916 8,106,024 -- -- Shares issued in reorganization of Pioneer Tax Free Income Fund 3,875,155 50,105,749 -- -- Less shares repurchased (1,974,866) (25,829,508) (599,847) (7,469,407) - ----------------------------------------------------------------------------------------------------- Net increase 4,429,042 $ 57,313,800 4,518 $ 11,218 ===================================================================================================== The accompanying notes are an integral part of these financial statements. 34 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 Financial Highlights - ------------------------------------------------------------------------------------------------------ Year Ended Year Ended 12/31/10 12/31/09 - ------------------------------------------------------------------------------------------------------ Class A Net asset value, beginning of period $ 12.86 $ 10.90 - ------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.57 $ 0.59 Net realized and unrealized gain (loss) on investments (0.28) 1.99 - ------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.29 $ 2.58 Distributions to shareowners: Net investment income (0.59) (0.61) Net realized gain -- (0.01) - ------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (0.30) $ 1.96 - ------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 12.56 $ 12.86 ====================================================================================================== Total return* 2.15% 24.01% Ratio of net expenses to average net assets+ 0.82% 0.82% Ratio of net investment income to average net assets+ 4.55% 4.94% Portfolio turnover rate 18% 18% Net assets, end of period (in thousands) $749,235 $479,599 Ratios with no waiver of management fees by the Adviser and no reduction for fees paid indirectly: Net expenses 0.85% 0.88% Net investment income 4.52% 4.88% Ratios with waiver of management fees by the Adviser and reduction for fees paid indirectly: Net expenses 0.82% 0.82% Net investment income 4.55% 4.94% ====================================================================================================== - --------------------------------------------------------------------------------------------------------------------- Year Ended Year Ended Year Ended 12/31/08 12/31/07 12/31/06 - --------------------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of period $ 13.50 $ 14.11 $ 14.13 - --------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income $ 0.60 $ 0.62 $ 0.53 Net realized and unrealized gain (loss) on investments (2.54) (0.42) 0.18 - --------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (1.94) $ 0.20 $ 0.71 Distributions to shareowners: Net investment income (0.59) (0.61) (0.61) Net realized gain (0.07) (0.20) (0.12) - --------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (2.60) $ (0.61) $ (0.02) - --------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.90 $ 13.50 $ 14.11 ===================================================================================================================== Total return* (14.85)% 1.40% 5.20% Ratio of net expenses to average net assets+ 0.82% 0.82% 0.86% Ratio of net investment income to average net assets+ 4.66% 4.45% 4.48% Portfolio turnover rate 27% 18% 8% Net assets, end of period (in thousands) $353,257 $451,219 $471,084 Ratios with no waiver of management fees by the Adviser and no reduction for fees paid indirectly: Net expenses 0.88% 0.85% 0.96% Net investment income 4.60% 4.42% 4.38% Ratios with waiver of management fees by the Adviser and reduction for fees paid indirectly: Net expenses 0.82% 0.82% 0.86% Net investment income 4.66% 4.45% 4.48% ===================================================================================================================== * 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 and no sales charges. Total return would be reduced if sales charges were taken into account. + Ratios assuming no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 35 Financial Highlights (continued) - ----------------------------------------------------------------------------------------------------- Year Ended Year Ended 12/31/10 12/31/09 - ----------------------------------------------------------------------------------------------------- Class B Net asset value, beginning of period $12.78 $10.83 - ----------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income $ 0.46 $ 0.50 Net realized and unrealized gain (loss) on investments (0.29) 1.96 - ----------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 0.17 $ 2.46 Distributions to shareowners: Net investment income (0.47) (0.50) Net realized gain -- (0.01) - ----------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $(0.30) $ 1.95 - ----------------------------------------------------------------------------------------------------- Net asset value, end of period $12.48 $12.78 ===================================================================================================== Total return* 1.25% 22.97% Ratio of net expenses to average net assets+ 1.68% 1.71% Ratio of net investment income to average net assets+ 3.68% 4.06% Portfolio turnover rate 18% 18% Net assets, end of period (in thousands) $8,169 $5,838 Ratios with no waiver of management fees by the Adviser and no reduction for fees paid indirectly: Net expenses 1.68% 1.71% Net investment income 3.68% 4.06% Ratios with waiver of management fees by the Adviser and reduction for fees paid indirectly: Net expenses 1.68% 1.71% Net investment income 3.68% 4.06% ===================================================================================================== - --------------------------------------------------------------------------------------------------------------------- Year Ended Year Ended Year Ended 12/31/08 12/31/07 2/31/06 - --------------------------------------------------------------------------------------------------------------------- Class B Net asset value, beginning of period $ 13.41 $14.03 $14.07 - ----------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income $ 0.48 $ 0.48 $ 0.46 Net realized and unrealized gain (loss) on investments (2.52) (0.41) 0.14 - ----------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (2.04) $ 0.07 $ 0.60 Distributions to shareowners: Net investment income (0.47) (0.49) (0.52) Net realized gain (0.07) (0.20) (0.12) - ----------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (2.58) $(0.62) $(0.04) - ----------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.83 $13.41 $14.03 ================================================================================================================= Total return* (15.60%) 0.46% 4.36% Ratio of net expenses to average net assets+ 1.72% 1.72% 1.69% Ratio of net investment income to average net assets+ 3.76% 3.55% 3.62% Portfolio turnover rate 27% 18% 8% Net assets, end of period (in thousands) $ 5,286 $6,737 $6,228 Ratios with no waiver of management fees by the Adviser and no reduction for fees paid indirectly: Net expenses 1.72% 1.78% 1.69% Net investment income 3.76% 3.49% 3.62% Ratios with waiver of management fees by the Adviser and reduction for fees paid indirectly: Net expenses 1.72% 1.72% 1.69% Net investment income 3.76% 3.55% 3.62% ================================================================================================================= * 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 and no sales charges. Total return would be reduced if sales charges were taken into account. + Ratios assuming no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. 36 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 - --------------------------------------------------------------------------------------------------------- Year Ended Year Ended 12/31/10 12/31/09 - --------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of period $ 12.77 $ 10.83 - ------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.47 $ 0.47 Net realized and unrealized gain (loss) on investments (0.30) 1.98 - ------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.17 $ 2.45 Distributions to shareowners: Net investment income (0.48) (0.50) Net realized gain -- (0.01) - ------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (0.31) $ 1.94 - ------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 12.46 $ 12.77 ====================================================================================================== Total return* 1.26% 22.93% Ratio of net expenses to average net assets+ 1.60% 1.64% Ratio of net investment income to average net assets+ 3.78% 4.08% Portfolio turnover rate 18% 18% Net assets, end of period (in thousands) $38,548 $26,422 Ratios assuming no waiver of management fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.60% 1.64% Net investment income 3.78% 4.08% Ratios with waiver of management fees by the Adviser and reduction for fees paid indirectly: Net expenses 1.60% 1.64% Net investment income 3.78% 4.08% ====================================================================================================== - -------------------------------------------------------------------------------------------------------------------- Year Ended Year Ended Year Ended 12/31/08 12/31/07 12/31/06 - -------------------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of period $ 13.42 $ 14.02 $ 14.04 - ----------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income $ 0.45 $ 0.45 $ 0.44 Net realized and unrealized gain (loss) on investments (2.48) (0.35) 0.18 - ----------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (2.03) $ 0.10 $ 0.62 Distributions to shareowners: Net investment income (0.49) (0.50) (0.52) Net realized gain (0.07) (0.20) (0.12) - ----------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (2.59) $ (0.60) $ (0.02) - ----------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.83 $ 13.42 $ 14.02 ================================================================================================================= Total return* (15.56)% 0.67% 4.52% Ratio of net expenses to average net assets+ 1.65% 1.58% 1.65% Ratio of net investment income to average net assets+ 3.85% 3.66% 3.58% Portfolio turnover rate 27% 18% 8% Net assets, end of period (in thousands) $15,157 $12,620 $ 5,891 Ratios assuming no waiver of management fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.65% 1.58% 1.65% Net investment income 3.85% 3.66% 3.58% Ratios with waiver of management fees by the Adviser and reduction for fees paid indirectly: Net expenses 1.65% 1.58% 1.65% Net investment income 3.85% 3.66% 3.58% ================================================================================================================= * 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 and no sales charges. Total return would be reduced if sales charges were taken into account. + Ratios assuming no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 37 Financial Highlights (continued) - --------------------------------------------------------------------------------------------------------- Year Ended Year Ended 12/31/10 12/31/09 - --------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 12.84 $ 10.89 - ------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.58 $ 0.63 Net realized and unrealized gain (loss) on investments (0.26) 1.96 - ------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.32 $ 2.59 Distributions to shareowners: Net investment income (0.63) (0.63) Net realized gain -- (0.01) - ------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (0.31) $ 1.95 - ------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 12.53 $ 12.84 ====================================================================================================== Total return* 2.34% 24.22% Ratio of net expenses to average net assets+ 0.55% 0.58% Ratio of net investment income to average net assets+ 4.81% 5.17% Portfolio turnover rate 18% 18% Net assets, end of period (in thousands) $76,959 $21,963 Ratios assuming no waiver of management fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.55% 0.58% Net investment income 4.80% 5.17% Ratios with waiver of management fees by the Adviser and reduction for fees paid indirectly: Net expenses 0.55% 0.58% Net investment income 4.81% 5.17% ====================================================================================================== - --------------------------------------------------------------------------------------------------------------------- Year Ended Year Ended 11/10/06 to 12/31/08 12/31/07 12/31/06 (a) - --------------------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 13.48 $ 14.09 $ 14.17 - ------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.62 $ 0.67 $ 0.09 Net realized and unrealized gain (loss) on investments (2.51) (0.44) (0.06) - ------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (1.89) $ 0.23 $ 0.03 Distributions to shareowners: Net investment income (0.63) (0.64) (0.11) Net realized gain (0.07) (0.20) -- - ------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (2.59) $ (0.61) $ (0.08) - ------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 10.89 $ 13.48 $ 14.09 ================================================================================================================== Total return* (14.56)% 1.67% 0.21%(b) Ratio of net expenses to average net assets+ 0.58% 0.54% 0.60%** Ratio of net investment income to average net assets+ 4.90% 4.73% 4.49%** Portfolio turnover rate 27% 18% 8%** Net assets, end of period (in thousands) $18,571 $23,331 $28,693 Ratios assuming no waiver of management fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.58% 0.54% 0.60%** Net investment income 4.90% 4.73% 4.49%** Ratios with waiver of management fees by the Adviser and reduction for fees paid indirectly: Net expenses 0.58% 0.54% 0.60%** Net investment income 4.90% 4.73% 4.49%** ================================================================================================================== (a) Class Y shares were first publicly offered November 10, 2006. (b) Not Annualized. * 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 assuming no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. 38 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 Notes to Financial Statements | 12/31/10 1. Organization and Significant Accounting Policies Pioneer AMT-Free Municipal Fund (the Fund) is one of three series of portfolios comprising Pioneer Series Trust II, a Delaware statutory trust. The Fund is 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 a high level of current income exempt from federal income tax as is consistent with the relative stability of capital. The Fund offers four classes of shares designated as Class A, Class B, Class C and Class Y shares. Effective as of the close of business on December 31, 2009, Class B shares are no longer offered to new or existing shareholders, except that dividends and/or capital gain distributions may continue to be reinvested in Class B shares, and shareholders may exchange their Class B shares for Class B shares of other Pioneer funds, as permitted by existing exchange privileges. Each class of shares represents an interest in the same portfolio of investments of the Fund and has identical rights (based on relative net asset values) to assets and liquidation proceeds. Share classes can bear different rates of class-specific fees and expenses such as transfer agent and distribution fees. Differences in class-specific fees and expenses will result in differences in net investment income and, therefore, the payment of different dividends from net investment income earned by each class. The Amended and Restated Declaration of Trust of the Fund gives the Board the flexibility to specify either per share voting or dollar-weighted voting when submitting matters for shareholder approval. Under per share voting, each share of a class of the Fund is entitled to one vote. Under dollar-weighted voting, a shareholder's voting power is determined not by the number of shares owned, but by the dollar value of the shares on the record date. Each share class has exclusive voting rights with respect to matters affecting only that class, including with respect to the distribution plan for that class. There is no distribution plan for Class Y shares. Class B shares convert to Class A shares approximately eight years after the date of purchase. At times, the Fund's investments may represent industries or industry sectors that are interrelated or have common risks, making the Fund more susceptible to any economic, political, or regulatory developments or other risks affecting those industries and sectors. The Fund's prospectus contains unaudited information regarding the Fund's principal risks. Please refer to that documents when considering the Fund's principal risks. The Fund's financial statements have been prepared in conformity with U.S. generally accepted accounting principles that require the management of the Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 39 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 gain or loss on investments during the reporting period. 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. Fixed income securities with remaining maturity of more than sixty days are valued at prices supplied by independent pricing services, which consider such factors as market prices, market events, quotations from one or more brokers, Treasury spreads, yields, maturities and ratings. Valuations may be supplemented by dealers and other sources, as required. Securities for which independent pricing services are unable to supply prices or for which market prices and/or quotations are not readily available or are considered to be unreliable are valued using fair value methods pursuant to procedures adopted by the Board of Trustees. The Fund may use fair value methods if it is determined that a significant event has occurred after the close of the exchange or market on which the security trades and prior to the determination of the Fund's net asset value. Thus, the valuation of the Fund's securities may differ from exchange prices. At December 30, 2010 one security was valued using fair value methods representing 0.0% of net assets (in addition to securities valued using prices supplied by independent pricing services). Inputs used when applying fair value methods to value a security may include credit ratings, the financial condition of the company, current market conditions and comparable securities. Short-term fixed income securities with remaining maturities of sixty days or less generally are valued at amortized cost. Discount and premium on debt securities are accreted or amortized, respectively, daily into interest income on a yield-to-maturity basis over the life of the respective security with a corresponding increase or decrease in the cost basis of the security. Interest income, including interest on income bearing cash accounts, is recorded on the accrual basis. Gains and losses on sales of investments are calculated on the identified cost method for both financial reporting and federal income tax purposes. 40 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 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 tax provision is required. Tax years for the prior three fiscal years remain subject to examination by tax authorities. 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 from or in excess of net investment income or as from net realized gain on investment transactions, or as from paid-in capital, depending on the type of book/tax differences that may exist. At December 31, 2010, the Fund had a net capital loss carryforward of $112,013,132, of which, the following amounts will expire between 2011 and 2017 if not utilized: $1,586,570 in 2011, $61,017,188 in 2014, $4,164,490 in 2015, $31,743,687 in 2016 and $13,501,197 in 2017. Included in this amount is $103,941,059 which, as a result of the reorganizations with Pioneer Tax Free Income Fund on March 5, 2010, may be subject to limitations imposed by the Internal Revenue Code. The Fund has elected to defer $629,323 in capital losses recognized between November 1, 2009 and December 31, 2010 to its fiscal year ending December 31, 2011. At December 31, 2010, the Fund has reclassified $7,353,328 to decrease accumulated net realized loss on investments and $7,353,328 to decrease paid-in capital to reflect permanent book/tax differences. The reclassification has no impact on the net assets of the Fund and presents the Fund's capital accounts on a tax basis. The tax character of distributions paid during the year ended December 31, 2010 and December 31, 2009 was follows: - -------------------------------------------------------- 2010 2009 - -------------------------------------------------------- Distributions paid from: Ordinary income $ 970,116 $ 323,596 Tax-exempt income 37,989,568 23,651,944 Long-term capital gain -- 199,893 - -------------------------------------------------------- Total $38,959,684 $24,175,433 ======================================================== Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 41 The following shows the components of distributable earnings on a federal income tax basis at December 31, 2010: - ------------------------------------------------------------- 2010 - ------------------------------------------------------------- Distributable earnings: Undistributed tax-exempt income $ 1,686,122 Capital loss carryforward (112,013,132) Current year post-October loss deferred (629,323) Unrealized depreciation (47,642,946) - ------------------------------------------------------------- Total $(158,599,279) ============================================================= The difference between book basis and tax basis unrealized depreciation is attributable to the tax treatment of premium and amortization. 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 UniCredit S.p.A., (UniCredit), earned approximately $86,910 in underwriting commissions on the sale of Class A shares during the year ended December 31, 2010. D. Class Allocations Income, common expenses and realized and unrealized gains and losses are calculated at the Fund level and allocated daily to each class of shares based on its respective percentage of adjusted net assets at the beginning of the day. Distribution fees are calculated based on the average daily net asset value attributable to Class A, Class B and Class C shares of the Fund, respectively (see Note 4). Class Y shares do not pay distribution fees. All expenses and fees paid to the transfer agent, Pioneer Investment Management Shareholder Services, Inc. (PIMSS), for its services are allocated among the classes of shares based on the number of accounts in each class and the ratable allocation of related out-of-pocket expenses (see Note 3). The Fund declares as daily dividends substantially all of its net investment income. All dividends are paid on a monthly basis. Short-term capital gain distributions, if any, may be declared with the daily dividends. 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 and at the same time, except that net investment income dividends to Class A, Class B, Class C and Class Y shares can reflect different transfer agent and distribution expense rates. 42 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 2. Management Agreement Pioneer Investment Management, Inc. (PIM), a wholly owned indirect subsidiary of UniCredit, manages the Fund's portfolio. Management fees are calculated daily at the annual rate of 0.50% of the Fund's average daily net assets up to $250 million; 0.45% of the next $500 million; and 0.40% of the excess over $750 million. For the year ended December 31, 2010, the effective management fee (excluding waivers and/or assumption of expenses) was equivalent to 0.45% of the Fund's average daily net assets. PIM has contractually agreed to limit ordinary operating expenses of the Fund to the extent required to reduce Fund expenses to 0.82% and 0.55% of the average daily net assets attributable to Class A and Class Y shares, respectively. Expenses waived during the year ended December 31, 2010 are reflected on the Statement of Operations. These limitations are in effect through May 1, 2012 for Class A shares and through May 1, 2011 for Class Y shares. There can be no assurance that PIM will extend the expense limit agreement for a class of shares beyond the date referred to above. 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 as administrative reimbursements. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $14,993 in management fees, administrative costs and certain other reimbursements payable to PIM at December 31, 2010. 3.Transfer Agent PIMSS, a wholly owned indirect subsidiary of UniCredit, provides substantially all transfer agent and shareowner services to the Fund at negotiated rates. In addition, the Fund reimburses PIMSS for out-of-pocket expenses incurred by PIMSS related to shareholder communications activities such as proxy and statement mailings, outgoing phone calls and omnibus relationship contracts. For the year ended December 31, 2010, such out-of-pocket expenses by class of shares were as follows: - ------------------------------------------ Shareholder Communications: - ------------------------------------------ Class A $ 180,028 Class B 6,172 Class C 12,135 Class Y 14,531 - ------------------------------------------ Total $ 212,866 ========================================== Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $60,843 in transfer agent fees and out-of-pocket reimbursements payable to PIMSS at December 31, 2010. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 43 4. Distribution Plan The Fund has adopted a Distribution Plan pursuant to Rule 12b-1 of the Investment Company Act of 1940 with respect to its Class A, Class B and Class C shares. Pursuant to the Plan, the Fund pays PFD 0.25% of the average daily net assets attributable to Class A shares as compensation for personal services and/or account maintenance services or distribution services with regard to Class A shares. Pursuant to the Plan, the Fund also pays PFD 1.00% of the average daily net assets attributable to Class B and Class C shares. The fee for Class B and Class C shares 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. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $6,430 in distribution fees payable to PFD at December 31, 2010. In addition, redemptions of each class of shares (except Class Y shares) may be subject to a contingent deferred sales charge (CDSC). A CDSC of 1.00% may be imposed on redemptions of certain net asset value purchases of Class A shares within 18 months of purchase (within 12 months for purchases made on or after April 1, 2009). Class B shares 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%, based on the lower of cost or market value of shares being redeemed. Shares purchased as part of an exchange remain subject to any CDSC that applied to the original purchase of those shares. There is no CDSC for Class Y shares. Proceeds from the CDSCs are paid to PFD. For the year ended December 31, 2010, CDSCs in the amount of $21,385 were paid to PFD. 5. Expense Offset Arrangements The Fund has entered into certain expense offset arrangements with PIMSS which may result in a reduction in the Fund's total expenses due to interest earned on cash held by PIMSS. For the year ended December 31, 2010, the Fund's expenses were not reduced under such arrangements. 6. Line of Credit Facility The Fund, along with certain other funds in the Pioneer Family of Funds (the Funds), participates in a $165 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 the amount available under the facility or the limits set for borrowing by the Fund's prospectus and the 1940 Act. Interest on borrowings is payable at the higher of the London Interbank Offered Rate (LIBOR) on the borrowing date plus 1.25% on an annualized basis or the Federal Funds Rate on the borrowing date plus 1.25% on an 44 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 annualized basis. The Funds pay an annual commitment fee for this facility. The commitment fee is allocated among participating Funds based on an allocation schedule set forth in the credit agreement. For the year ended December 31, 2010, the Fund had no borrowings under this agreement. 7. Reorganization Information Pioneer AMT-Free CA Municipal Fund was reorganized into Pioneer AMT-Free Municipal Fund on June 12, 2009. The purpose of this transaction was to combine two funds (managed by PIM) with similar investment objectives and strategies. This tax-free reorganization was accomplished by exchanging the assets and liabilities of Pioneer AMT-Free CA Municipal Fund for shares of Pioneer AMT-Free Municipal Fund. Shareowners holding Class A, Class B and Class C shares of Pioneer AMT-Free CA Municipal Fund received Class A, Class B and Class C shares, respectively, of Pioneer AMT-Free Municipal Fund in the reorganization. The investment portfolio of Pioneer AMT-Free CA Municipal Fund, with a value of $72,747,025 and an identified cost of $84,821,239 at June 12, 2009, was the principal asset acquired by Pioneer AMT-Free Municipal Fund. For financial reporting purposes, assets received by Pioneer AMT-Free Municipal Fund were valued using prices supplied by independent pricing services and shares issued by Pioneer AMT-Free Municipal Fund were recorded at net asset value; however, the cost basis of the investments received from Pioneer AMT-Free CA Municipal Fund was carried forward to align ongoing reporting of Pioneer AMT-Free Municipal Fund's realized and unrealized gains and losses with amounts distributable to shareowners for tax purposes. The following charts show the details of the reorganization as of that Closing Date: - --------------------------------------------------------------------------------------------- Pioneer AMT-Free Pioneer AMT-Free Pioneer AMT-Free Municipal Fund CA Municipal Fund Municipal Fund (Pre-Reorganization) (Pre-Reorganization) (Post-Reorganization) - --------------------------------------------------------------------------------------------- Net Assets Class A $400,815,520 $68,324,416 $469,139,936 Class B $ 5,743,770 $ 779,574 $ 6,523,344 Class C $ 18,143,923 $ 4,871,016 $ 23,014,939 Class Y $ 19,582,373 $ -- $ 19,582,373 - ------------------------------------------------------------------------------------ Total Net Assets $444,285,586 $73,975,006 $518,260,592 - ------------------------------------------------------------------------------------ Shares Outstanding Class A 33,459,729 6,442,737 39,162,936 Class B 482,564 73,910 548,075 Class C 1,525,803 462,799 1,935,477 Class Y 1,637,397 -- 1,637,397 Shares Issued in Reorganization Class A 5,703,207 Class B 65,510 Class C 409,673 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 45 - ----------------------------------------------------------------------- Unrealized Accumulated Depreciation On Loss On Closing Date Closing Date - ----------------------------------------------------------------------- Pioneer AMT-Free CA Municipal Fund $ (12,074,214) $ (461,259) Assuming the reorganization had been completed on January 1, 2009, the beginning of the annual reporting period for Pioneer AMT-Free Municipal Fund, Pioneer AMT-Free Municipal Fund's pro forma results of operations for the year ended December 31, 2009, are as follows: - --------------------------------------------------------------------- - --------------------------------------------------------------------- Net investment income $ 25,775,244 Net gain on investments $ 84,796,536 Net increase in net assets resulting from operations $110,571,780 Each of Pioneer Tax Free Income Fund and Pioneer Intermediate Tax Free Income Fund was reorganized into Pioneer AMT-Free Municipal Fund on March 5, 2010. The purpose of this transaction was to combine three funds (managed by PIM) with similar investment objectives and strategies. This tax-free reorganization was accomplished by exchanging the assets and liabilities of each of Pioneer Tax Free Income Fund and Pioneer Intermediate Tax Free Income Fund for shares of Pioneer AMT-Free Municipal Fund. Shareowners holding Class A, Class B, Class C and Class Y shares of Pioneer Tax Free Income Fund received Class A, Class B, Class C and Class Y shares, respectively, of Pioneer AMT-Free Municipal Fund in the reorganization. Shareowners holding Class A, Class C and Class Y shares of Pioneer Intermediate Tax Free Income Fund received Class A, Class C and Class Y shares, respectively, of Pioneer AMT-Free Municipal Fund in the reorganization. The investment portfolio of Pioneer Tax Free Income Fund, with a value of $379,164,310 and an identified cost of $406,499,798 at March 5, 2010 and the investment portfolio of Pioneer Intermediate Tax Free Income Fund, with a value of $15,394,263 and an identified cost of $14,594,363 at March 5, 2010, were the principal assets acquired by Pioneer AMT-Free Municipal Fund in the respective reorganizations. For financial reporting purposes, assets received by Pioneer AMT-Free Municipal Fund were valued using prices supplied by independent pricing services and shares issued by Pioneer AMT-Free Municipal Fund were recorded at net asset value; however, the cost basis of the investments received from Pioneer Tax Free Income Fund and Pioneer Intermediate Tax Free Income Fund were carried forward to align ongoing reporting of Pioneer AMT-Free Municipal Fund's realized and unrealized gains and losses with amounts distributable to shareowners for tax purposes. The following charts show the details of the reorganization as of that Closing Date: 46 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 - ----------------------------------------------------------------------------------------------------------------- Pioneer Intermediate Pioneer AMT-Free Pioneer Tax Free Tax Free Pioneer AMT-Free Municipal Fund Income Fund Income Fund Municipal Fund (Pre-Reorganization) (Pre-Reorganization) (Pre-Reorganization) (Post-Reorganization) - ----------------------------------------------------------------------------------------------------------------- Net Assets Class A $ 476,945,445 $ 330,104,753 $ 7,710,163 $ 814,760,361 Class B $ 5,413,460 $ 7,790,030 $ -- $ 13,203,490 Class C $ 26,433,776 $ 13,717,192 $ 66,460 $ 40,217,428 Class Y $ 22,111,557 $ 50,105,749 $ 8,106,024 $ 80,323,330 - --------------------------------------------------------------------------------------------------------- Total Net Assets $ 530,904,238 $ 401,717,724 $ 15,882,647 $ 948,504,609 - --------------------------------------------------------------------------------------------------------- Shares Outstanding Class A 36,814,211 31,542,771 805,790 62,880,177 Class B 420,588 749,140 -- 1,025,874 Class C 2,055,785 1,330,179 6,939 3,127,609 Class Y 1,710,161 4,805,238 847,542 6,212,232 Exchange Exchange Shares Issued in Ratio Ratio Reorganization Class A 0.0772 0.0772 26,065,966 Class B 0.0777 -- 605,286 Class C 0.0778 0.0778 1,071,824 Class Y 0.0773 0.0773 4,502,071 - -------------------------------------------------------------------------------- Unrealized Appreciation Accumulated (Depreciation) On Gain (Loss) On Closing Date Closing Date - -------------------------------------------------------------------------------- Pioneer Tax Free Income Fund $ (27,335,488) $ (111,461,671) Pioneer Intermediate Tax Free Income Fund $ 799,900 $ 322,967 8. Subsequent Events In preparing these financial statements, PIM has evaluated the impact of all subsequent events and transactions for potential recognition or disclosure and has determined that there were no subsequent events requiring recognition or disclosure. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 47 Report of Independent Registered Public Accounting Firm To the Board of Trustees of Pioneer Series Trust II and Shareowners of Pioneer AMT-Free Municipal Fund: - -------------------------------------------------------------------------------- We have audited the accompanying statement of assets and liabilities of Pioneer AMT-Free Municipal Fund, one of the series comprising the Pioneer Series Trust II (the "Trust"), including the schedule of investments, as of December 31, 2010, and the related statement of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, and the financial highlights for each of the periods indicated therein. These financial statements and financial highlights are the responsibility of the Trust's management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. We were not engaged to perform an audit of the Trust's internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Trust's internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements and financial highlights, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our procedures included confirmation of securities owned as of December 31, 2010, by correspondence with the custodian or by other appropriate auditing procedures where replies from brokers were not received. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the financial position of Pioneer AMT-Free Municipal Fund of the Pioneer Series Trust II at December 31, 2010, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended, and financial highlights for each of the periods indicated therein, in conformity with U.S. generally accepted accounting principles. /s/ Ernst & Young Boston, Massachusetts February 25, 2011 48 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 ADDITIONAL INFORMATION (unaudited) The percentages of the Fund's ordinary income distributions that are exempt from nonresident alien (NRA) tax withholding resulting from qualified interest income and qualified short term gains were 98.50% and 0.0%, respectively. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 49 Approval of Investment Advisory Agreement Pioneer Investment Management, Inc. (PIM) serves as the investment adviser to Pioneer AMT-Free Municipal Fund (the Fund) pursuant to an investment advisory agreement between PIM and the Fund. In order for PIM to remain the investment adviser of the Fund, the Trustees of the Fund must determine annually whether to renew the investment advisory agreement for the Fund. The contract review process began in March 2010 as the Trustees of the Fund agreed on, among other things, an overall approach and timeline for the process. In July 2010, the Trustees approved the format of the contract review materials and submitted their formal request to PIM to furnish information necessary to evaluate the terms of the investment advisory agreement. The contract review materials were provided to the Trustees in September 2010. After reviewing and discussing the materials, the Trustees submitted a request for additional information to PIM, and materials were provided in response to this request. Meetings of the independent Trustees of the Fund were held in July, September, October, and November, 2010 to review and discuss the contract review materials. In addition, the Trustees took into account the information related to the Fund provided to the Trustees at each regularly scheduled meeting. At a meeting held on November 16, 2010, based on their evaluation of the information provided by PIM and third parties, the Trustees of the Fund, including the independent Trustees voting separately, unanimously approved the renewal of the investment advisory agreement for another year. In considering the renewal of the investment advisory agreement, the Trustees considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the renewal of the agreement. Nature, Extent and Quality of Services The Trustees considered the nature, extent and quality of the services that had been provided by PIM to the Fund, taking into account the investment objective and strategy of the Fund. The Trustees reviewed the terms of the investment advisory agreement. The Trustees also reviewed PIM's investment approach for the Fund, its research process and its process for trade execution. The Trustees considered the resources of PIM and the personnel of PIM who provide investment management services to the Fund. The Trustees considered the non-investment resources and personnel of PIM involved in PIM's services to the Fund, including PIM's compliance and legal resources and personnel. In addition, the Trustees considered the arrangements put in place to retain key investment and other personnel. The Trustees also considered the substantial 50 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 attention and high priority given by PIM's senior management to the Pioneer fund complex. The Trustees considered that PIM supervises and monitors the performance of the Fund's service providers and provides the Fund with personnel (including Fund officers) and other resources that are necessary for the Fund's business management and operations. The Trustees also considered that, as administrator, PIM is responsible for the administration of the Fund's business and other affairs. The Trustees considered the fees paid to PIM for the provision of administration services. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that had been provided by PIM to the Fund were satisfactory and consistent with the terms of the investment advisory agreement. Performance of the Fund The Trustees considered the performance results of the Fund over various time periods. They reviewed information comparing the Fund's performance with the performance of its peer group of funds as classified by Morningstar, Inc. (Morningstar), an independent provider of investment company data, and with the performance of the Fund's benchmark index. The Trustees considered that the Fund's annualized total return was in the first quintile of its Morningstar category for the one and ten year periods ended June 30, 2010, in the third quintile of its Morningstar category for the three year period ended June 30, 2010, and in the second quintile of its Morningstar category for the five year period ended June 30, 2010. (In all quintile rankings referred to throughout this disclosure, first quintile is most favorable to the Fund's shareowners. Thus, highest relative performance would be first quintile and lowest relative expenses would also be first quintile.) The Trustees concluded that the investment performance of the Fund was satisfactory. Management Fee and Expenses The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees of its peer group of funds as classified by Morningstar and the expense ratios of a peer group of funds selected on the basis of criteria determined by the independent Trustees for this purpose using data provided by Strategic Insight Mutual Trust Research and Consulting, LLC (Strategic Insight), an independent third party. The Trustees considered that the Fund's management fee for the twelve months ended June 30, 2010 was in the fourth quintile relative to the management fees paid by other funds in its Morningstar peer group for the comparable period. The Trustees also considered the breakpoints in the management fee schedule and the reduced fee rates above certain asset levels. The Trustees noted that the Fund's management fee was approximately two basis points over the median management fee of its peer group. The Trustees considered that the Fund's Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 51 expense ratio for the twelve months ended June 30, 2010 was in the third quintile relative to its Strategic Insight peer group for the comparable period. The Trustees also reviewed management fees charged by PIM to its institutional and other clients. In evaluating the fees associated with PIM's client accounts, the Trustees took into account the respective demands, resources and complexity associated with the Fund and client accounts. The Trustees noted that in some instances the fee rates for those clients were lower than the management fee for the Fund and considered that, under the investment advisory agreement with the Fund, PIM performs additional services for the Fund that it does not provide to those other clients or services that are broader in scope, including oversight of the Fund's other service providers and activities related to compliance and the extensive regulatory and tax regimes to which the Fund is subject. The Trustees concluded that the management fee payable by the Fund to PIM was reasonable in relation to the nature and quality of the services provided by PIM. The Trustees also concluded that the Fund's expense ratio was reasonable taking into account the nature and quality of services provided by PIM and the contractual expense limitation agreed to by PIM with respect to the Fund. Profitability The Trustees considered information provided by PIM regarding the profitability of PIM with respect to the advisory services provided by PIM to the Fund, including the methodology used by PIM in allocating certain of its costs to the management of the Fund. The Trustees also considered PIM's profit margin in connection with the overall operation of the Fund. They further reviewed the financial results realized by PIM and its affiliates from non-fund businesses. The Trustees considered PIM's profit margins with respect to the Fund in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees concluded that PIM's profitability with respect to the management of the Fund was not unreasonable. Economies of Scale The Trustees considered PIM's views relating to economies of scale in connection with the Pioneer Funds as fund assets grow and the extent to which any such economies of scale are shared with funds and fund shareholders. The Trustees recognize that economies of scale are difficult to identify and quantify and that, among other factors that may be relevant, are the following: fee levels, expense subsidization, investment by PIM in research and analytical capabilities and PIM's commitment and resource allocation to the Funds. The Trustees noted that profitability also may be an indicator of the availability of any economies of scale, although profitability may vary for other reasons particularly, for example during the recent difficult periods for financial markets, as 52 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 the level of services was maintained notwithstanding a significant decline in PIM's fee revenues from the Funds. Accordingly, the Trustees concluded that economies of scale, if any, were being appropriately shared with the Fund. Other Benefits The Trustees considered the other benefits to PIM from its relationship with the Fund. The Trustees considered the character and amount of fees paid by the Fund, other than under the investment advisory agreement, for services provided by PIM and its affiliates. The Trustees further considered the revenues and profitability of PIM's businesses other than the fund business. The Trustees considered the intangible benefits to PIM by virtue of its relationship with the Fund and the other Pioneer funds. The Trustees concluded that the receipt of these benefits was reasonable in the context of the overall relationship between PIM and the Fund. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including all of the independent Trustees, concluded that the investment advisory agreement between PIM and the Fund, including the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of the investment advisory agreement for the Fund. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 53 Trustees, Officers and Service Providers Investment Adviser Pioneer Investment Management, Inc. Custodian Brown Brothers Harriman & Co. Independent Registered Public Accounting Firm Ernst & Young LLP Principal Underwriter Pioneer Funds Distributor, Inc. Legal Counsel Bingham McCutchen 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 12-month period ended June 30 is publicly available to shareowners at www.pioneerinvestments.com. This information is also available on the Securities and Exchange Commission's web site at http://www.sec.gov. Trustees and Officers The Fund's Trustees and officers are listed below, together with their principal occupations during at least the past five years. Trustees who are interested persons of the Fund within the meaning of the 1940 Act are referred to as Interested Trustees. Trustees who are not interested persons of the Fund are referred to as Independent Trustees. Each of the Trustees, except Mr. West, serves as a trustee of each of the 56 U.S. registered investment portfolios for which Pioneer serves as investment adviser (the "Pioneer Funds"). Mr. West serves as a trustee of 44 U.S. registered investment portfolios for which Pioneer serves as investment adviser. The address for all Trustees and all officers of the fund is 60 State Street, Boston, Massachusetts 02109. The Statement of Additional Information of the Fund includes additional information about the Trustees and is available, without charge, upon request, by calling 1-800-225-6292. 54 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 Interested Trustees - ----------------------------------------------------------------------------------------------------------------------------------- Position Held Length of Service Other Directorships Name and Age with the Fund and Term of Office Principal Occupation Held by this Trustee - ----------------------------------------------------------------------------------------------------------------------------------- John F. Cogan, Jr. (84)* Chairman of the Board, Trustee since 2004. Non-Executive Chairman and a None Trustee and President Serves until a successor director of Pioneer Investment trustee is elected or Management USA Inc. ("PIM-USA"); earlier retirement or Chairman and a director of removal. Pioneer; Chairman and Director of Pioneer Institutional Asset Management, Inc. (since 2006); Director of Pioneer Alternative Investment Management Limited (Dublin); President and a director of Pioneer Alternative Investment Management (Bermuda) Limited and affiliated funds; Deputy Chairman and a director of Pioneer Global Asset Management S.p.A. ("PGAM") (until April 2010); Director of PIOGLOBAL Real Estate Investment Fund (Russia) (until June 2006); Director of Nano-C, Inc. (since 2003); Director of Cole Management Inc. (since 2004); Director of Fiduciary Counseling, Inc.; President and Director of Pioneer Funds Distributor, Inc. ("PFD") (until May 2006); President of all of the Pioneer Funds; and Of Counsel, Wilmer Cutler Pickering Hale and Dorr LLP - ----------------------------------------------------------------------------------------------------------------------------------- Daniel K. Kingsbury (52)* Trustee and Executive Trustee since 2007. Director, CEO and President of None Vice President Serves until a successor PIM-USA (since February 2007); trustee is elected or Director and President of earlier retirement or Pioneer and Pioneer removal. Institutional Asset Management, Inc. (since February 2007); Executive Vice President of all of the Pioneer Funds (since March 2007); Director of PGAM (2007 - 2010); Head of New Europe Division, PGAM (2000 - 2005); and Head of New Markets Division, PGAM (2005 - 2007) - ----------------------------------------------------------------------------------------------------------------------------------- * Mr. Cogan and Mr. Kingsbury are Interested Trustees because they are officers or directors of the Fund's investment adviser and certain of its affiliates. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 55 Independent Trustees - ----------------------------------------------------------------------------------------------------------------------------------- Position Held Length of Service Other Directorships Name and Age with the Fund and Term of Office Principal Occupation Held by this Trustee - ----------------------------------------------------------------------------------------------------------------------------------- David R. Bock (67) Trustee Trustee since 2005. Managing Partner, Federal City Director of Enterprise Serves until a successor Capital Advisors (corporate Community Investment, Inc. trustee is elected or advisory services company) (1997 (privately held affordable earlier retirement or - 2004 and 2008 - present); housing finance company) (1985 removal. Interim Chief Executive Officer, - 2010); Director of Oxford Oxford Analytica, Inc. Analytica, Inc. (2008 - (privately held research and present); Director of The consulting company) (2010); Swiss Helvetia Fund, Inc. Executive Vice President and (closed-end fund) (2010 - Chief Financial Officer, I-trax, present); and Director of New Inc. (publicly traded health York Mortgage Trust (publicly care services company) (2004 - traded mortgage REIT) (2004 - 2007); and Executive Vice 2009) President and Chief Financial Officer, Pedestal Inc. (internet-based mortgage trading company) (2000 - 2002) - ----------------------------------------------------------------------------------------------------------------------------------- Mary K. Bush (62) Trustee Trustee since 2004. Chairman, Bush International, Director of Marriott Serves until a successor LLC (international financial International, Inc. (2008 - trustee is elected or advisory firm) (1991 - present); present); Director of Discover earlier retirement or Senior Managing Director, Brock Financial Services (credit removal. Capital Group, LLC (strategic card issuer and electronic business advisers) (2010 - payment services) (2007 - present); Managing Director, present); Former Director of Federal Housing Finance Board Briggs & Stratton Co. (engine (oversight of Federal Home Loan manufacturer) (2004 - 2009); Bank system) (1989 - 1991); Vice Former Director of UAL President and Head of Corporation International Finance, Federal National Mortgage Association (1988 - 1989); U.S. Alternate Executive Director, International Monetary Fund (1984 - 1988); Executive Assistant to Deputy Secretary of the U.S. Treasury, U.S. Treasury Department (1982 - 1984); and Vice President and Team Leader in Corporate Banking, Bankers Trust Co. (1976 - 1982) - ----------------------------------------------------------------------------------------------------------------------------------- 56 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 - ----------------------------------------------------------------------------------------------------------------------------------- Position Held Length of Service Other Directorships Name and Age with the Fund and Term of Office Principal Occupation Held by this Trustee - ----------------------------------------------------------------------------------------------------------------------------------- Mary K. Bush (62) (continued) (airline holding company) (2006 - 2010); Director of ManTech International Corporation (national security, defense, and intelligence technology firm) (2006 - present); Member, Board of Governors, Investment Company Institute (2007 - present); Member, Board of Governors, Independent Directors Council (2007 - present); Former Director of Brady Corporation (2000 - 2007); Former Director of Mortgage Guaranty Insur- ance Corporation (1991 - 2006); Former Director of Millennium Chemicals, Inc. (commodity chemicals) (2002 - 2005); Former Director, R.J. Reynolds Tobacco Holdings, Inc. (tobacco) (1999 - 2005); and Former Director of Texaco, Inc. (1997 - 2001) - ----------------------------------------------------------------------------------------------------------------------------------- Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 57 Independent Trustees (continued) - ----------------------------------------------------------------------------------------------------------------------------------- Position Held Length of Service Other Directorships Name and Age with the Fund and Term of Office Principal Occupation Held by this Trustee - ----------------------------------------------------------------------------------------------------------------------------------- Benjamin M. Friedman (66) Trustee Trustee since 2008. William Joseph Maier Professor of Trustee, Mellon Serves until a successor Political Economy, Harvard Institutional Funds trustee is elected or University (1972 - present) Investment Trust and earlier retirement or Mellon Institutional Funds removal. Master Portfolio (oversaw 17 portfolios in fund complex) (1989 - 2008) - ----------------------------------------------------------------------------------------------------------------------------------- Margaret B.W. Graham (63) Trustee Trustee since 2004. Founding Director, Vice President None Serves until a successor and Corporate Secretary, The trustee is elected or Winthrop Group, Inc. (consulting earlier retirement or firm) (1982 - present); Desautels removal. Faculty of Management, McGill University (1999 - present); and Manager of Research Operations and Organiza- tional Learning, Xerox PARC, Xerox's Advance Research Center (1990 - 1994) - ----------------------------------------------------------------------------------------------------------------------------------- Thomas J. Perna (60) Trustee Trustee since 2006. Chairman and Chief Executive Director, Broadridge Serves until a successor Officer, Quadriserv, Inc. Financial Solutions, Inc. trustee is elected or (technology products for (investor communications earlier retirement or securities lending industry) and securities processing removal. (2008 - present); private provider for financial investor (2004 - 2008); and services industry) (2009 - Senior Executive Vice President, present); and Director, The Bank of New York (financial Quadriserv, Inc. (2005 - and securities services) (1986 - present) 2004) - ----------------------------------------------------------------------------------------------------------------------------------- 58 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 - ----------------------------------------------------------------------------------------------------------------------------------- Position Held Length of Service Other Directorships Name and Age with the Fund and Term of Office Principal Occupation Held by this Trustee - ----------------------------------------------------------------------------------------------------------------------------------- Marguerite A. Piret (62) Trustee Trustee since 2004. President and Chief Executive Director of New America Serves until a successor Officer, Newbury, Piret & High Income Fund, Inc. trustee is elected or Company, Inc. (investment banking (closed-end investment earlier retirement or firm) (1981 - present) company) (2004 - present); removal. and member, Board of Governors, Investment Company Institute (2000 - 2006) - ----------------------------------------------------------------------------------------------------------------------------------- Stephen K. West (82) Trustee Trustee since 2008. Senior Counsel, Sullivan & Director, The Swiss Serves until a successor Cromwell LLP (law firm) (1998 - Helvetia Fund, Inc. trustee is elected or present); and Partner, Sullivan & (closed-end investment earlier retirement or Cromwell LLP (prior to 1998) company); and Director, removal. AMVESCAP, PLC (investment manager) (1997 - 2005) - ----------------------------------------------------------------------------------------------------------------------------------- Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 59 Fund Officers - ----------------------------------------------------------------------------------------------------------------------------------- Position Held Length of Service Other Directorships Name and Age with the Fund and Term of Office Principal Occupation Held by this Officer - ----------------------------------------------------------------------------------------------------------------------------------- Christopher J. Kelley (46) Secretary Since 2010. Serves at Vice President and Associate General None the discretion of the Counsel of Pioneer since January 2008 Board. and Secretary of all of the Pioneer Funds since June 2010; Assistant Secretary of all of the Pioneer Funds from September 2003 to May 2010; and Vice President and Senior Counsel of Pioneer from July 2002 to December 2007 - ----------------------------------------------------------------------------------------------------------------------------------- Carol B. Hannigan (49) Assistant Since 2010. Serves at Fund Governance Director of Pioneer None Secretary the discretion of the since December 2006 and Assistant Board. Secretary of all the Pioneer Funds since June 2010; Manager - Fund Governance of Pioneer from December 2003 to November 2006; and Senior Paralegal of Pioneer from January 2000 to November 2003 - ----------------------------------------------------------------------------------------------------------------------------------- Thomas Reyes (48) Assistant Since 2010. Serves at Counsel of Pioneer since June 2007 None Secretary the discretion of the and Assistant Secretary of all the Board. Pioneer Funds since June 2010; and Vice President and Counsel at State Street Bank from October 2004 to June 2007 - ----------------------------------------------------------------------------------------------------------------------------------- Mark E. Bradley (51) Treasurer Since 2008. Serves at Vice President - Fund Accounting, None the discretion of the Administration and Controllership Board. Services of Pioneer; Treasurer of all of the Pioneer Funds since March 2008; Deputy Treasurer of Pioneer from March 2004 to February 2008; Assistant Treasurer of all of the Pioneer Funds from March 2004 to February 2008; and Treasurer and Senior Vice President, CDC IXIS Asset Management Services, from 2002 to 2003 - ----------------------------------------------------------------------------------------------------------------------------------- Luis I. Presutti (45) Assistant Since 2004. Serves at Assistant Vice President - Fund None Treasurer the discretion of the Accounting, Administration and Board. Controllership Services of Pioneer; and Assistant Treasurer of all of the Pioneer Funds - ----------------------------------------------------------------------------------------------------------------------------------- 60 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 - ----------------------------------------------------------------------------------------------------------------------------------- Position Held Length of Service Other Directorships Name and Age with the Fund and Term of Office Principal Occupation Held by this Officer - ----------------------------------------------------------------------------------------------------------------------------------- Gary Sullivan (52) Assistant Since 2004. Serves at Fund Accounting Manager - Fund None Treasurer the discretion of the Accounting, Administration and Board. Controllership Services of Pioneer; and Assistant Treasurer of all of the Pioneer Funds - ----------------------------------------------------------------------------------------------------------------------------------- David F. Johnson (31) Assistant Since 2009. Serves at Fund Administration Manager - Fund None Treasurer the discretion of the Accounting, Administration and Board. Controllership Services since November 2008; Assistant Treasurer of all of the Pioneer Funds since January 2009; and Client Service Manager - Institutional Investor Services at State Street Bank from March 2003 to March 2007 - ----------------------------------------------------------------------------------------------------------------------------------- Jean M. Bradley (58) Chief Compliance Since 2010. Serves at Chief Compliance Officer of Pioneer None Officer the discretion of the and of all the Pioneer Funds since Board. March 2010; Director of Adviser and Portfolio Compliance at Pioneer since October 2005; and Senior Compliance Officer for Columbia Management Advisers, Inc. from October 2003 to October 2005 - ----------------------------------------------------------------------------------------------------------------------------------- Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 61 This page for your notes. 62 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 This page for your notes. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 63 This page for your notes. 64 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 This page for your notes. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 65 This page for your notes. 66 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 This page for your notes. Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 67 This page for your notes. 68 Pioneer AMT-Free Municipal Fund | Annual Report | 12/31/10 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 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@pioneerinvestments.com (for general questions about Pioneer only) Visit our web site: pioneerinvestments.com This report must be preceded or accompanied by a prospectus. 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. Pioneer Growth Opportunities Fund - -------------------------------------------------------------------------------- Annual Report | December 31, 2010 - -------------------------------------------------------------------------------- Ticker Symbols: Class A PGOFX Class B GOFBX Class C GOFCX Class R PGRRX Class Y GROYX [LOGO] PIONEER Investments(R) visit us: pioneerinvestments.com Table of Contents Letter to Shareowners 2 Portfolio Management Discussion 4 Portfolio Summary 8 Prices and Distributions 9 Performance Update 10 Comparing Ongoing Fund Expenses 15 Schedule of Investments 17 Financial Statements 27 Notes to Financial Statements 36 Report of Independent Registered Public Accounting Firm 45 Approval of Investment Advisory Agreement 46 Trustees, Officers and Service Providers 50 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 1 President's Letter Dear Shareowner, Throughout 2010, the U.S. economy moved forward on a slow path to recovery. But with the memory of a deep recession still lingering, businesses and consumers remained cautious about both investing and spending. While business fundamentals showed signs of improvement, there was still a reluctance to hire, and high unemployment remains a problem. Wary investors, concerned about risk, gravitated towards cash and bonds, until a rally late in the year lifted equity returns. We remain generally optimistic about the prospects for economic recovery, although it may occur more slowly than many would like. At Pioneer, we have long advocated the benefits of staying diversified and investing for the long term. This strategy has generally performed well for many investors. Bond markets certainly rewarded investors in the first eleven months of 2010. While the equity markets barely budged for those first eleven months, valuations were inexpensive relative to bonds, compared with historic levels, and represented potentially good value for long-term investors, many of whom were rewarded in the subsequent late-year equity rally. Pioneer has not changed the basic approach to investing that we have used for more than 80 years. We remain focused on company fundamentals and risk management. Our investment process is based on careful research into individual companies, quantitative analysis, and active portfolio management. This three-pillared process, which we apply to each of our portfolios, is supported by an integrated team approach and is designed to carefully balance risk and reward. Our experienced professionals devote themselves to the careful research needed to identify investment opportunities in markets around the world. Our advice, as always, is to work closely with a trusted financial advisor to discuss your goals and work together to develop an investment strategy that meets your individual needs. There is no single best strategy that works for every investor. 2 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 We invite you to learn more about Pioneer and our time-tested approach to investing by consulting with your financial advisor or visiting us online at www.pioneerinvestments.com. We greatly appreciate your trust in us and we thank you for investing with Pioneer. Sincerely, /s/ Daniel K. Kingsbury Daniel K. Kingsbury President and CEO Pioneer Investment Management USA, Inc. Any information in this shareowner 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. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 3 Portfolio Management Discussion | 12/31/10 In the following interview, Brian Stack, portfolio manager of Pioneer Growth Opportunities Fund, discusses the factors that influenced the Fund's performance during the 12-month period ended December 31, 2010. Q How did the Fund perform over the 12 months ended December 31, 2010? A Pioneer Growth Opportunities Fund Class A shares returned 19.60% at net asset value over the 12 months ended December 31, 2010, while the Fund's benchmark, the Russell 2000 Growth Index (the Russell Index), returned 29.09%. Over the same period, the average return of the 499 mutual funds in Lipper's Small Cap Growth Funds category was 27.62%. Q What is your explanation for the Fund's underperformance of both the Russell Index and its peers over the 12 months ended December 31, 2010? A The broader-market backdrop, while positive in terms of its absolute results, proved challenging to our long-standing investment style for the Fund. For many years, we have employed an approach known as "GARP," which stands for "Growth at a Reasonable Price." The GARP style looks for stocks offering the best combination of durable earnings growth and reasonable valuations. We believe this approach creates a positive balance of risk and reward over the long term, since it identifies not just stocks enjoying strong prospective growth, but also those whose reasonable valuations promise the best outlook for strong risk-adjusted returns through a full investment cycle. Unfortunately, the GARP style was slightly out of step with the market in 2010. The market saw unprecedented levels of correlation between individual stocks. Moreover, dispersion in performance between individual securities was near-record low levels. The relatively narrow list of stocks that outperformed were among the most richly valued, fastest growing, and most volatile. As a result, investors were rewarded for taking on more risk and holding on to their winners. That was a difficult environment for a strategy such as ours, which focuses on attractively valued and less-volatile growth companies whose virtues are not yet fully reflected in their share prices. While we're pleased that the Fund produced a good absolute return for the 12 months ended December 31, 2010, we are disappointed with its underperformance of the Russell Index and its peers over the full calendar year. However, even in the hottest momentum-driven markets, it pays to remember that, ultimately, valuations do matter. We have therefore stayed true to the investment discipline that has worked well for the Fund over the past decade. 4 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 Q In what areas did the Fund's positioning hurt its performance over the 12 months ended December 31, 2010? A The Fund's positioning in the consumer discretionary sector had the largest negative impact on its performance. The Fund held a large underweight in the sector, as we found relatively few attractive individual stocks at a time in which consumer spending remained challenged due to excessive debt, high unemployment and poor wage growth. Consumer spending rebounded during 2010, however, as pent-up demand fueled improved earnings results and strong share performance within the sector. The Fund's underweight in the sector, together with poor stock selection, cost the Fund about four percentage points of benchmark-relative performance during the annual reporting period ended December 31, 2010. The Fund's positioning in the energy sector also pressured performance results. Energy stocks performed very well as a group, rising by about 44% for the year. There was a large disparity, however, between the performance of oil-related stocks, which surged behind the robust gain in crude oil prices; and natural gas stocks, which lagged sharply due to the commodity's poor price performance. The Fund was tilted more toward the natural gas side, which kept it from fully participating in the sector's strong gain. Among individual stocks, a key detractor from Fund performance was Amag Pharmaceutical, whose shares were hit hard in response to a disappointing launch of a new drug aimed at treating chronic kidney disease. Assured Guaranty, which guarantees municipal bond issues, performed poorly amidst concerns about the potential for rising municipal bond defaults. Chiquita International also posted disappointing share performance. The Fund owned the stock because of the company's movement into higher-margin packaged fruit products, as well as its ongoing debt-reduction efforts. Chiquita's shares underperformed, however, in response to weak European demand and banana pricing. Q What were some positive areas of performance for the Fund over the 12 months ended December 31, 2010? A As would be expected at a time in which the Fund returned more than 19% over a 12-month period, the portfolio had its share of strong performers in 2010. The leading contributor holding was an industrial stock, Polypore International, which makes separations membranes used in conventional automotive batteries and in kidney dialysis machines. The company also has a very large and fast-growing opportunity in the emerging market for electric vehicles. Polypore's shares gained more than 240% during 2010. The Fund's second-largest contributor was a technology stock, Finisar. A maker of fiber-optic systems for networking and high-speed data communications, Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 5 Finisar saw its shares surge in response to strong earnings and recovering demand in its end markets. In health care, the Fund benefited from the strong performance of DexCom and Air Methods. DexCom, a maker of medical devices, is the leader in continuous glucose monitoring, which allows improved management of diabetes. Air Methods, a provider of emergency air transport services, posted strong gains in response to both better-than-expected earnings and the premium-priced purchase (by private equity players) of a leading competitor. Another leading contributor to Fund performance over the 12-month period was Globe Specialty Metals (GSM), a maker of silicon-based metal and alloys used in industrial products, aluminum, steel and automotive parts. GSM is a low-cost producer, and its shares surged in response to earnings gains fueled by revived industrial activity. Q How do you view the broader market environment as we move into 2011? A We believe the recession is now behind us, but we also recognize the headwinds to consumer demand growth posed by high unemployment, poor wage growth and elevated levels of indebtedness. Recent economic numbers have been bulwarked by a significant amount of inventory re-stocking and the release of some pent-up consumer and industrial demand. We therefore do not expect to see a sharp, "V-shaped" recovery, but rather a sustained period of more modest, below-trend economic growth. As the sense of economic crisis abates, we expect the challenges posed by high correlations to diminish. Accordingly, we envision a more normalized investment environment, in which greater value can be added through stock selection. We continue to like the roster of individual companies held by the Fund, which is reflected in the relatively low level of portfolio turnover during the second half of the fiscal year ended December 31, 2010. Further, we have recently taken steps to augment our research team through the addition of new analysts; a move that we believe will help strengthen our stock-picking efforts for the Fund in the year ahead. In the short run, it can be difficult to outperform a momentum-driven market, but ultimately, we believe stocks with consistent earnings and reasonable valuations will be rewarded. We believe the Fund is well positioned to build on its strong long-term track record in the months and years ahead. 6 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 Please refer to the Schedule of Investments on pages 17-26 for a full listing of Fund securities. Investments in small companies may offer the potential for higher returns, but are also subject to greater short-term price fluctuations than larger, more established companies. Investing in foreign and/or emerging markets securities involves risks relating to interest rates, currency exchange rates, economic, and political conditions. At times, the Fund's investments may represent industries or industry sectors that are interrelated or have common risks, making it more susceptible to any economic, political, or regulatory developments or other risks affecting those industries and sectors. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. 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 opinions should not be relied upon for any other purposes. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 7 Portfolio Summary | 12/31/10 Portfolio Diversification - -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [THE DATA BELOW IS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL.] U.S. Common Stocks 78.8% Temporary Cash Investments 20.2% Exchange Traded Fund 1.0% Sector Distribution - -------------------------------------------------------------------------------- (As a percentage of total equity holdings) [THE DATA BELOW IS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL.] Information Technology 33.3% Health Care 21.1% Industrials 18.8% Consumer Discretionary 11.8% Financials 6.2% Energy 4.9% Consumer Staples 2.0% Materials 1.9% 10 Largest Holdings - -------------------------------------------------------------------------------- (As a percentage of equity holdings)* 1. Orbital Sciences Corp 2.02% - -------------------------------------------------------------------------------- 2. Blackboard, Inc. 1.60 - -------------------------------------------------------------------------------- 3. Alere, Inc. 1.53 - -------------------------------------------------------------------------------- 4. Entropic Communications, Inc. 1.52 - -------------------------------------------------------------------------------- 5. TransDigm Group, Inc. 1.50 - -------------------------------------------------------------------------------- 6. Haemonetics Corp. 1.47 - -------------------------------------------------------------------------------- 7. Catalyst Health Solutions, Inc. 1.46 - -------------------------------------------------------------------------------- 8. Integrated Device Tech, Inc. 1.37 - -------------------------------------------------------------------------------- 9. Brookdale Senior Living, Inc. 1.37 - -------------------------------------------------------------------------------- 10. DexCom, Inc. 1.37 - -------------------------------------------------------------------------------- * This list excludes temporary cash investments and derivative instruments. The portfolio is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any security listed. 8 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 Prices and Distributions | 12/31/10 Net Asset Value per Share - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- Class 12/31/10 12/31/09 - -------------------------------------------------------------------------------- A $27.28 $22.81 - -------------------------------------------------------------------------------- B $23.17 $19.60 - -------------------------------------------------------------------------------- C $23.47 $19.81 - -------------------------------------------------------------------------------- R $27.20 $22.80 - -------------------------------------------------------------------------------- Y $28.13 $23.39 - -------------------------------------------------------------------------------- Distributions per Share: 1/1/10-12/31/10 - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains - -------------------------------------------------------------------------------- A $ -- $ -- $ -- - -------------------------------------------------------------------------------- B $ -- $ -- $ -- - -------------------------------------------------------------------------------- C $ -- $ -- $ -- - -------------------------------------------------------------------------------- R $ -- $ -- $ -- - -------------------------------------------------------------------------------- Y $ -- $ -- $ -- - -------------------------------------------------------------------------------- Index Definitions - -------------------------------------------------------------------------------- The Russell 2000 Growth Index measures the performance of U.S. small-cap growth stocks. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses, or sales charges. It is not possible to invest directly in an index. The index defined here pertains to the "Value of $10,000 Investment" and "Value of $5 million Investment" charts on pages 10-14. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 9 Performance Update | 12/31/10 Class A Shares Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Growth Opportunities Fund at public offering price, compared to that of the Russell 2000 Growth Index. Average Annual Total Returns (As of December 31, 2010) - ------------------------------------------------------------------------ Net Asset Public Offering Period Value (NAV) Price (POP) - ------------------------------------------------------------------------ 10 Years 4.58% 3.96% 5 Years 2.16 0.96 1 Year 19.60 12.73 - ------------------------------------------------------------------------ Expense Ratio (Per prospectus dated May 1, 2010) - ------------------------------------------------------------------------ Gross Net - ------------------------------------------------------------------------ 1.35% 1.35% - ------------------------------------------------------------------------ [THE DATA BELOW IS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $10,000 Investment Pioneer Growth Opportunities Fund Russell 2000 Growth Index 12/00 $ 9,425 $10,000 11,467 9,077 12/02 7,218 6,330 10,370 9,403 12/04 12,675 10,748 13,254 11,195 12/06 13,887 12,689 13,346 13,583 12/08 8,623 8,348 12,331 11,226 12/10 14,748 14,491 Call 1-800-225-6292 or visit www.pioneerinvestments.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. Pioneer Growth Opportunities Fund was created through the reorganization of predecessor Safeco Growth Opportunities Fund on December 10, 2004. The performance shown for Class A shares of the Fund for periods prior to December 10, 2004, is based on the performance of the predecessor fund's Class A shares, which has been restated to reflect differences in any applicable sales charges (but not differences in expenses). If all the expenses of the Fund were reflected, the performance shown would be lower. 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 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. 10 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 Performance Update | 12/31/10 Class B Shares Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Growth Opportunities Fund, compared to that of the Russell 2000 Growth Index. Average Annual Total Returns (As of December 31, 2010) - -------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------- 10 Years 3.50% 3.50% 5 Years 0.87 0.87 1 Year 18.21 14.21 - -------------------------------------------------------------------- Expense Ratio (Per prospectus dated May 1, 2010) - -------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------- 2.58% 2.58% - -------------------------------------------------------------------- [THE DATA BELOW IS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $10,000 Investment Pioneer Growth Opportunities Fund Russell 2000 Growth Index 12/00 $10,000 $10,000 12,077 9,077 12/02 7,544 6,330 10,761 9,403 12/04 13,044 10,748 13,511 11,195 12/06 14,017 12,689 13,307 13,583 12/08 8,462 8,348 11,932 11,226 12/10 14,106 14,491 Call 1-800-225-6292 or visit www.pioneerinvestments.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 (CDSC). The maximum CDSC is 4% and declines over five years. 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. Pioneer Growth Opportunities Fund was created through the reorganization of predecessor Safeco Growth Opportunities Fund on December 10, 2004. The performance shown for Class B shares of the Fund for periods prior to December 10, 2004, is based on the performance of the predecessor fund's Class B shares, which has been restated to reflect differences in any applicable sales charges (but not differences in expenses). If all the expenses of the Fund were reflected, the performance shown would be lower. 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 more information. The performance table and graph do not reflect the deduction of taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 11 Performance Update | 12/31/10 Class C Shares Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Growth Opportunities Fund, compared to that of the Russell 2000 Growth Index. Average Annual Total Returns (As of December 31, 2010) - -------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------- 10 Years 3.62% 3.62% 5 Years 1.04 1.04 1 Year 18.48 18.48 - -------------------------------------------------------------------- Expense Ratio (Per prospectus dated May 1, 2010) - -------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------- 2.39% 2.39% - -------------------------------------------------------------------- [THE DATA BELOW IS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $10,000 Investment Pioneer Growth Opportunities Fund Russell 2000 Growth Index 12/00 $10,000 $10,000 12,074 9,077 12/02 7,548 6,330 10,766 9,403 12/04 13,050 10,748 13,550 11,195 12/06 14,083 12,689 13,384 13,583 12/08 8,526 8,348 12,047 11,226 12/10 14,272 14,491 Call 1-800-225-6292 or visit www.pioneerinvestments.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 C shares held for less than one year are also subject to a 1% contingent deferred sales charge (CDSC). "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. 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. Pioneer Growth Opportunities Fund was created through the reorganization of predecessor Safeco Growth Opportunities Fund on December 10, 2004. The performance shown for Class C shares of the Fund for periods prior to December 10, 2004, is based on the performance of the predecessor fund's Class C shares, which has been restated to reflect differences in any applicable sales charges (but not differences in expenses). This adjustment has the effect of reducing the previously reported performance of the predecessor fund. If all the expenses of the Fund were reflected, the performance shown would be lower. 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 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. 12 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 Performance Update | 12/31/10 Class R Shares Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Growth Opportunities Fund, compared to that of the Russell 2000 Growth Index. Average Annual Total Returns (As of December 31, 2010) - -------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------- 10 Years 3.76% 3.76% 5 Years 1.07 1.07 1 Year 19.30 19.30 - -------------------------------------------------------------------- Expense Ratio (Per prospectus dated May 1, 2010) - -------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------- 1.58% 1.58% - -------------------------------------------------------------------- [THE DATA BELOW IS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $10,000 Investment Pioneer Growth Opportunities Fund Russell 2000 Growth Index 12/00 $10,000 $10,000 12,106 9,077 12/02 7,582 6,330 10,839 9,403 12/04 13,184 10,748 13,717 11,195 12/06 14,301 12,689 13,498 13,583 12/08 8,571 8,348 12,125 11,226 12/10 14,465 14,491 Call 1-800-225-6292 or visit www.pioneerinvestments.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. Pioneer Growth Opportunities Fund was created through the reorganization of predecessor Safeco Growth Opportunities Fund on December 10, 2004. The performance shown for Class R shares for periods prior to December 10, 2004, is based on the performance of the predecessor fund's Class A shares, which has been restated to reflect any differences in any applicable sales charges. This adjustment has the effect of reducing the previously reported performance of predecessor fund. If all the expenses of the Fund were reflected, the performance shown would be lower. Performance for periods from December 10, 2004, to the inception of Class R shares on August 3, 2009, is based on the performance of the Pioneer Growth Opportunities Fund's Class A shares, reduced to reflect the higher distribution and service fees for Class R shares. Class R 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 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. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 13 Performance Update | 12/31/10 Class Y Shares Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 million investment made in Pioneer Growth Opportunities Fund, compared to that of the Russell 2000 Growth Index. Average Annual Total Returns (As of December 31, 2010) - -------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------- 10 Years 4.87% 4.87% 5 Years 2.72 2.72 1 Year 20.26 20.26 - -------------------------------------------------------------------- Expense Ratio (Per prospectus dated May 1, 2010) - -------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------- 0.77% 0.77% - -------------------------------------------------------------------- [THE DATA BELOW IS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $5,000,000 Investment Pioneer Growth Opportunities Fund Russell 2000 Growth Index 12/00 $5,000,000 $5,000,000 6,083,032 4,538,589 12/02 3,828,971 3,165,125 5,500,903 4,701,585 12/04 6,723,827 5,374,213 7,037,455 5,597,399 12/06 7,421,570 6,344,399 7,163,062 6,791,445 12/08 4,651,547 4,174,029 6,691,248 5,612,761 12/10 8,047,234 7,245,377 Call 1-800-225-6292 or visit www.pioneerinvestments.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. Pioneer Growth Opportunities Fund was created through the reorganization of predecessor Safeco Growth Opportunities Fund on December 10, 2004. The performance for Class Y shares for periods prior to December 10, 2004, is based on the performance of the predecessor fund's Class A shares, which has been restated to reflect any differences in any applicable sales charges. This adjustment has the effect of reducing the previously reported performance of predecessor fund. If all the expenses of the Fund were reflected, the performance shown would be lower. Performance shown for periods from December 10, 2004, to the inception of Class Y shares on September 23, 2005, reflects the NAV performance of the Pioneer Growth Opportunities Fund's Class A shares. The performance does not reflect differences in expenses, including the Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares are generally higher than those of Class Y shares, the performance for Class Y shares prior to their inception would have been higher than that shown. 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 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. 14 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 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 [divided by] $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 Growth Opportunities Fund Based on actual returns from July 1, 2010, through December 31, 2010. - ---------------------------------------------------------------------------------------------------- Share Class A B C R Y - ---------------------------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 07/01/10 - ---------------------------------------------------------------------------------------------------- Ending Account $1,236.18 $1,228.54 $1,230.07 $1,235.25 $1,239.67 Value on 12/31/10 - ---------------------------------------------------------------------------------------------------- Expenses Paid $7.27 $13.76 $12.70 $8.73 $4.29 During Period* - ---------------------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 1.29%, 2.45%, 2.26%, 1.55% and 0.76% for Class A, Class B, Class C, Class R, and Class Y, respectively, multiplied by the average account value over the period, multiplied by 184/365 (to reflect the one-half year period). Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 15 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 Growth Opportunities Fund Based on a hypothetical 5% return per year before expenses, reflecting the period from July 1, 2010, through December 31, 2010. - ---------------------------------------------------------------------------------------------------- Share Class A B C R Y - ---------------------------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 07/01/10 - ---------------------------------------------------------------------------------------------------- Ending Account $1,018.70 $1,012.85 $1,013.81 $1,017.39 $1,021.37 Value on 12/31/10 - ---------------------------------------------------------------------------------------------------- Expenses Paid $6.56 $12.43 $11.47 $7.88 $3.87 During Period* - ---------------------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 1.29%, 2.45%, 2.26%, 1.55% and 0.76% for Class A, Class B, Class C, Class R, and Class Y, respectively, multiplied by the average account value over the period, multiplied by 184/365 (to reflect the one-half year period). 16 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 Schedule of Investments | 12/31/10 - ---------------------------------------------------------------------- Shares Value - ---------------------------------------------------------------------- COMMON STOCKS -- 96.8% ENERGY -- 4.8% Oil & Gas Equipment & Services -- 1.8% 279,500 Exterran Holdings, Inc.* (b) $ 6,694,025 523,300 Geokinetics, Inc.* (b) 4,861,457 ------------ $ 11,555,482 - ---------------------------------------------------------------------- Oil & Gas Exploration & Production -- 1.8% 157,259 Carrizo Oil & Gas, Inc.* $ 5,423,863 51,100 Whiting Petroleum Corp.* 5,988,409 ------------ $ 11,412,272 - ---------------------------------------------------------------------- Oil & Gas Refining & Marketing -- 1.2% 538,900 CVR Energy, Inc* $ 8,180,502 ------------ Total Energy $ 31,148,256 - ---------------------------------------------------------------------- MATERIALS -- 1.8% Diversified Metals & Mining -- 0.9% 331,200 Globe Specialty Metals, Inc.* $ 5,660,208 - ---------------------------------------------------------------------- Precious Metals & Minerals -- 0.9% 281,800 Stillwater Mining Co.* $ 6,016,430 ------------ Total Materials $ 11,676,638 - ---------------------------------------------------------------------- CAPITAL GOODS -- 11.5% Aerospace & Defense -- 5.4% 176,800 DigitalGlobe, Inc.* $ 5,606,328 382,700 Hexcel Corp.* (b) 6,923,043 744,500 Orbital Sciences Corp.* 12,753,285 131,628 TransDigm Group, Inc.* 9,478,532 ------------ $ 34,761,188 - ---------------------------------------------------------------------- Construction & Engineering -- 2.3% 237,000 KBR Inc. $ 7,221,390 379,431 MYR Group, Inc.* (b) 7,968,051 ------------ $ 15,189,441 - ---------------------------------------------------------------------- Electrical Component & Equipment -- 1.1% 170,100 Polypore International, Inc.* (b) $ 6,928,173 - ---------------------------------------------------------------------- Industrial Machinery -- 1.6% 255,241 Altra Holdings, Inc.* $ 5,069,086 130,900 Kennametal, Inc. 5,165,314 ------------ $ 10,234,400 - ---------------------------------------------------------------------- Trading Companies & Distributors -- 1.1% 362,100 Titan Machinery, Inc.* (b) $ 6,988,530 ------------ Total Capital Goods $ 74,101,732 - ---------------------------------------------------------------------- COMMERCIAL SERVICES & SUPPLIES -- 3.6% Diversified Support Services -- 1.1% 182,336 Copart, Inc.* (b) $ 6,810,250 - ---------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 17 Schedule of Investments | 12/31/10 (continued) - -------------------------------------------------------------------------- Shares Value - -------------------------------------------------------------------------- Office Services & Supplies -- 0.8% 247,700 Sykes Enterprises, Inc.* $ 5,018,402 - -------------------------------------------------------------------------- Research & Consulting Services -- 1.7% 180,400 Acacia Research Corp.* $ 4,679,576 112,200 CoStar Group, Inc.* (b) 6,458,232 ------------ $ 11,137,808 ------------ Total Commercial Services & Supplies $ 22,966,460 - -------------------------------------------------------------------------- TRANSPORTATION -- 3.4% Air Freight & Couriers -- 1.1% 345,900 UTI Worldwide, Inc. (b) $ 7,333,080 - -------------------------------------------------------------------------- Marine Ports & Services -- 1.2% 730,100 Aegean Marine Petroleum Network, Inc. (b) $ 7,614,943 - -------------------------------------------------------------------------- Trucking -- 1.1% 545,200 Swift Transportation Co.* $ 6,820,452 ------------ Total Transportation $ 21,768,475 - -------------------------------------------------------------------------- CONSUMER DURABLES & APPAREL -- 5.4% Apparel, Accessories & Luxury Goods -- 2.0% 160,400 Carter's, Inc.* $ 4,733,404 104,500 The Warnaco Group, Inc.* 5,754,815 66,281 Vera Bradley, Inc.* (b) 2,187,273 ------------ $ 12,675,492 - -------------------------------------------------------------------------- Footwear -- 1.9% 331,632 Skechers U.S.A.* (b) $ 6,632,640 170,500 Wolverine World Wide, Inc. 5,435,540 ------------ $ 12,068,180 - -------------------------------------------------------------------------- Housewares & Specialties -- 0.9% 118,500 Tupperware Brands Corp. (b) $ 5,648,895 - -------------------------------------------------------------------------- Leisure Products -- 0.6% 736,100 Leapfrog Enterprises, Inc.* $ 4,085,355 ------------ Total Consumer Durables & Apparel $ 34,477,922 - -------------------------------------------------------------------------- CONSUMER SERVICES -- 0.9% Casinos & Gaming -- 0.9% 132,200 WMS Industries, Inc.* $ 5,980,728 ------------ Total Consumer Services $ 5,980,728 - -------------------------------------------------------------------------- MEDIA -- 1.0% Movies & Entertainment -- 1.0% 351,419 Cinemark Holdings, Inc. (b) $ 6,058,464 ------------ Total Media $ 6,058,464 - -------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 18 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 - -------------------------------------------------------------------------- Shares Value - -------------------------------------------------------------------------- RETAILING -- 4.3% Apparel Retail -- 2.7% 236,000 Citi Trends, Inc.* (b) $ 5,793,800 277,900 Express, Inc.* (b) 5,224,520 182,200 Urban Outfitters, Inc.* (b) 6,524,582 ------------ $ 17,542,902 - -------------------------------------------------------------------------- Automotive Retail -- 0.5% 102,600 Monro Muffler Brake, Inc. (b) $ 3,548,934 - -------------------------------------------------------------------------- Internet Retail -- 1.1% 862,000 Orbitz Worldwide, Inc.* (b) $ 4,818,580 384,134 Vitacost.com, Inc.* (b) (d) 1,989,814 ------------ $ 6,808,394 ------------ Total Retailing $ 27,900,230 - -------------------------------------------------------------------------- FOOD, BEVERAGE & TOBACCO -- 2.0% Packaged Foods & Meats -- 2.0% 445,600 Chiquita Brands International, Inc.* (b) $ 6,247,312 199,100 Green Mountain Coffee Roasters, Inc.* (b) 6,542,426 ------------ $ 12,789,738 ------------ Total Food, Beverage & Tobacco $ 12,789,738 - -------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 15.6% Health Care Equipment -- 6.2% 700,553 Abiomed, Inc.* (b) $ 6,732,314 148,706 ArthroCare Corp.* (b) 4,618,808 632,344 DexCom, Inc.* (b) 8,631,496 258,300 Insulet Corp.* (b) 4,003,650 324,300 MAKO Surgical Corp.* 4,935,846 134,200 Masimo Corp. (b) 3,901,194 239,500 Thoratec Corp.* (b) 6,782,640 ------------ $ 39,605,948 - -------------------------------------------------------------------------- Health Care Facilities -- 1.3% 403,200 Brookdale Senior Living, Inc.* (b) $ 8,632,512 - -------------------------------------------------------------------------- Health Care Services -- 5.1% 119,993 Air Methods Corp.* $ 6,752,006 197,900 Catalyst Health Solutions, Inc.* 9,200,371 58,900 HMS Holdings Corp.* 3,814,953 160,539 IPC The Hospitalist Co., Inc.* (b) 6,262,626 263,550 Lincare Holdings, Inc. (b) 7,071,047 ------------ $ 33,101,003 - -------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 19 Schedule of Investments | 12/31/10 (continued) - ----------------------------------------------------------------------- Shares Value - ----------------------------------------------------------------------- Health Care Supplies -- 3.0% 264,500 Alere, Inc.* (b) $ 9,680,700 147,400 Haemonetics Corp.* 9,312,732 ------------ $ 18,993,432 ------------ Total Health Care Equipment & Services $100,332,895 - ----------------------------------------------------------------------- PHARMACEUTICALS & BIOTECHNOLOGY -- 5.1% Biotechnology -- 4.3% 82,000 Alexion Pharmaceuticals, Inc.* $ 6,605,100 366,300 Alkermes, Inc.* 4,498,164 231,900 BioMarin Pharmaceutical, Inc.* (b) 6,245,067 326,100 Cubist Pharmaceuticals, Inc.* (b) 6,978,540 148,800 Myriad Genetics, Inc.* 3,398,592 ------------ $ 27,725,463 - ----------------------------------------------------------------------- Life Sciences Tools & Services -- 0.8% 247,800 Parexel International Corp.* $ 5,260,794 ------------ Total Pharmaceuticals & Biotechnology $ 32,986,257 - ----------------------------------------------------------------------- BANKS -- 0.5% Regional Banks -- 0.5% 157,800 Home Bancshares, Inc. $ 3,476,334 ------------ Total Banks $ 3,476,334 - ----------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 2.6% Consumer Finance -- 1.0% 220,198 Ezcorp, Inc.* $ 5,973,972 - ----------------------------------------------------------------------- Investment Banking & Brokerage -- 0.8% 328,870 E*Trade Financial Corp.* $ 5,261,920 - ----------------------------------------------------------------------- Specialized Finance -- 0.8% 135,000 MSCI, Inc.* (b) $ 5,259,600 ------------ Total Diversified Financials $ 16,495,492 - ----------------------------------------------------------------------- INSURANCE -- 1.7% Property & Casualty Insurance -- 1.7% 356,100 Assured Guaranty, Ltd. $ 6,302,970 132,300 Axis Capital Holdings, Ltd. 4,746,924 ------------ $ 11,049,894 ------------ Total Insurance $ 11,049,894 - ----------------------------------------------------------------------- SOFTWARE & SERVICES -- 19.9% Application Software -- 8.0% 399,733 Aspen Technology, Inc.* (b) $ 5,076,609 244,800 Blackboard, Inc.* (b) 10,110,240 206,400 Bottomline Technologies, Inc.* 4,480,944 85,752 Concur Technologies, Inc.* (b) 4,453,101 349,675 Solarwinds, Inc.* 6,731,244 100,132 Solera Holdings, Inc. 5,138,774 The accompanying notes are an integral part of these financial statements. 20 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 - ----------------------------------------------------------------------- Shares Value - ----------------------------------------------------------------------- Application Software -- (continued) 156,300 SuccessFactors, Inc.* (b) $ 4,526,448 136,433 The Ultimate Software Group, Inc.* (b) 6,634,737 501,281 TiVo, Inc.* (b) 4,326,055 ------------ $ 51,478,152 - ----------------------------------------------------------------------- Data Processing & Outsourced Services -- 2.1% 145,900 Global Payments, Inc. $ 6,742,039 145,500 Syntel, Inc. 6,953,445 ------------ $ 13,695,484 - ----------------------------------------------------------------------- Internet Software & Services -- 3.8% 234,522 Dealertrack Holdings, Inc.* (b) $ 4,706,858 452,300 Dice Holdings, Inc.* 6,490,505 101,300 LogMeIn, Inc.* (b) 4,491,642 74,600 VistaPrint NV* (b) 3,431,600 186,804 Vocus, Inc.* (b) 5,166,999 ------------ $ 24,287,604 - ----------------------------------------------------------------------- IT Consulting & Other Services -- 3.2% 210,300 Gartner Group, Inc.* $ 6,981,960 454,300 Sapient Corp. 5,497,030 514,900 Virtusa Corp.* 8,423,764 ------------ $ 20,902,754 - ----------------------------------------------------------------------- Systems Software -- 2.8% 427,704 DemandTec, Inc.* $ 4,636,311 160,500 Fortinet, Inc.* (b) 5,192,175 415,200 Radiation Systems, Inc.* 8,125,464 ------------ $ 17,953,950 ------------ Total Software & Services $128,317,944 - ----------------------------------------------------------------------- TECHNOLOGY HARDWARE & EQUIPMENT -- 4.6% Communications Equipment -- 2.4% 282,347 Finisar Corp.* (b) $ 8,382,882 877,700 ShoreTel, Inc.* 6,854,837 ------------ $ 15,237,719 - ----------------------------------------------------------------------- Electronic Equipment & Instruments -- 1.3% 281,900 Flir Systems, Inc.* (b) $ 8,386,525 - ----------------------------------------------------------------------- Electronic Manufacturing Services -- 0.9% 402,300 TTM Technologies, Inc.* (b) $ 5,998,293 ------------ Total Technology Hardware & Equipment $ 29,622,537 - ----------------------------------------------------------------------- SEMICONDUCTORS -- 8.1% Semiconductor Equipment -- 0.8% 402,200 Nanometrics, Inc.* $ 5,160,226 - ----------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 21 Schedule of Investments | 12/31/10 (continued) - ------------------------------------------------------------------------------------- Shares Value - ------------------------------------------------------------------------------------- Semiconductors -- 7.3% 795,800 Entropic Communications, Inc.* (b) $ 9,613,264 77,900 Hittite Microwave Corp.* 4,755,016 1,298,300 Integrated Device Tech, Inc.* (b) 8,646,678 543,100 Lattice Semiconductor Corp.* 3,291,186 276,500 Microsemi Corp.* 6,331,850 197,669 Netlogic Microsystems, Inc.* (b) 6,208,783 972,800 PMC-Sierra, Inc.* 8,356,352 ------------ $ 47,203,129 ------------ Total Semiconductors $ 52,363,355 - ------------------------------------------------------------------------------------- TOTAL COMMON STOCKS (Cost $483,064,766) $623,513,351 - ------------------------------------------------------------------------------------- EXCHANGE TRADED FUND -- 1.2% Diversified Financials -- 1.2% Multi-Sector Holding -- 1.2% 91,800 iShares Russell 2000 Growth Exchange Traded Fund (b) $ 8,025,156 ------------ TOTAL EXCHANGE TRADED FUND (Cost $6,303,903) $ 8,025,156 - ------------------------------------------------------------------------------------- - ------------------------------------------------------------------------------------- Principal Amount ($) - ------------------------------------------------------------------------------------- TEMPORARY CASH INVESTMENTS -- 24.8% Securities Lending Collateral -- 24.8% (c) Certificates of Deposit: 4,528,174 Bank of Nova Scotia, 0.37%, 9/29/11 $ 4,528,174 3,169,722 BBVA Group NY, 0.61%, 7/26/11 3,169,722 3,303,031 BNP Paribas Bank NY, 0.1%, 1/3/11 3,303,031 2,264,087 BNP Paribas Bank NY, 0.29%, 2/8/11 2,264,087 2,264,087 BNP Paribas Bank NY, 0.3%, 1/20/11 2,264,087 4,528,174 Canadian Imperial Bank of Commerce NY, 0.29%, 4/27/11 4,528,174 4,528,174 DnB NOR Bank ASA NY, 0.25%, 3/7/11 4,528,174 2,263,945 National Australia Bank NY, 0.31%, 10/19/11 2,263,945 4,528,174 RaboBank Netherland NV NY, 0.31%, 8/8/11 4,528,174 4,528,174 Royal Bank of Canada NY, 0.44%, 12/2/11 4,528,174 2,264,087 SocGen NY, 0.30%, 2/10/11 2,264,087 4,528,174 Westpac Banking Corp. NY, 0.44%, 12/6/11 4,528,174 ------------ $ 42,698,003 - ------------------------------------------------------------------------------------- Commercial Paper: 2,716,904 American Honda Finance, 0.30%, 5/4/11 $ 2,716,904 1,817,904 American Honda Finance, 1.05%, 6/20/11 1,817,904 1,663,385 Australia & New Zealand Banking Group, 0.89%, 8/4/11 1,663,385 4,612,936 Caterpillar Financial Services Corp., 1.05%, 6/24/11 4,612,936 4,980,991 CBA, 0.32%, 1/3/11 4,980,991 1,358,079 CHARFD, 0.26%, 2/8/11 1,358,079 2,263,543 FAIRPP, 0.27%, 2/2/11 2,263,543 The accompanying notes are an integral part of these financial statements. 22 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 - ------------------------------------------------------------------------------- Principal Amount ($) Value - ------------------------------------------------------------------------------- Commercial Paper -- (continued): 2,324,717 FAIRPP, 0.27%, 3/7/11 $ 2,324,717 4,528,554 Federal Home Loan Bank, 0.37%, 6/1/11 4,528,554 2,264,059 GE Corp., 0.34%, 1/26/11 2,264,059 2,264,864 General Electric Capital Corp., 0.38%, 4/28/11 2,264,864 452,638 General Electric Capital Corp., 0.38%, 6/6/11 452,638 4,525,830 OLDLLC, 0.27%, 3/11/11 4,525,830 4,526,359 SEB, 0.39%, 2/7/11 4,526,359 5,433,778 SOCNAM, 0.1%, 1/3/11 5,433,778 2,263,850 SOCNAM, 0.29%, 1/14/11 2,263,850 2,715,184 STDFIN, 0.6%, 2/8/11 2,715,184 4,527,167 STRAIT, 0.25%, 2/2/11 4,527,167 2,263,934 TBLLC, 0.27%, 1/10/11 2,263,934 2,263,543 TBLLC, 0.27%, 2/2/11 2,263,543 4,528,174 Toyota Motor Credit Corp., 0.44%, 9/8/11 4,528,174 1,810,694 VARFUN, 0.26%, 2/14/11 1,810,694 2,759,891 VARFUN, 0.27%, 1/20/11 2,759,891 2,716,953 Wachovia, 0.40%, 3/22/11 2,716,953 1,812,445 Wachovia, 0.42%, 10/15/11 1,812,445 ------------- $ 73,396,376 - -------------------------------------------------------------------------------- Tri-party Repurchase Agreements: 6,611,134 Deutsche Bank Securities, Inc., 0.22%, 1/3/11 $ 6,611,134 9,056,347 HSBC Bank USA NA, 0.21%, 1/3/11 9,056,347 13,131,704 RBS Securities, Inc., 0.25%, 1/3/11 13,131,704 ------------- $ 28,799,185 - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- Shares - -------------------------------------------------------------------------------- Money Market Mutual Funds: 7,245,078 Dreyfus Preferred Money Market Fund $ 7,245,078 7,245,078 Fidelity Prime Money Market Fund 7,245,078 ------------- $ 14,490,156 ------------- Total Securities Lending Collateral $ 159,383,720 - -------------------------------------------------------------------------------- TOTAL TEMPORARY CASH INVESTMENTS (Cost $159,383,720) $ 159,383,720 - -------------------------------------------------------------------------------- TOTAL INVESTMENT IN SECURITIES -- 122.8% (Cost $648,752,389) (a) $ 790,922,227 - -------------------------------------------------------------------------------- OTHER ASSETS AND LIABILITIES -- (22.8)% $(147,055,301) - -------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $ 643,866,926 ================================================================================ * Non-income producing security. The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 23 Schedule of Investments | 12/31/10 (continued) (a) At December 31, 2010, the net unrealized gain on investments based on cost for federal income tax purposes of $654,881,019 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $146,077,603 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (10,036,395) ------------ Net unrealized gain $136,041,208 ============ (b) At December 31, 2010, the following securities were out on loan: - ------------------------------------------------------------------------------- Shares Security Value - ------------------------------------------------------------------------------- 204,000 Abiomed, Inc.* $ 1,960,440 104,600 Aegean Marine Petroleum Network, Inc. 1,090,978 249,400 Alere, Inc.* 9,128,040 34,600 ArthroCare Corp.* 1,074,676 21,400 Aspen Technology, Inc.* 271,780 229,500 BioMarin Pharmaceutical, Inc.* 6,180,435 241,800 Blackboard, Inc.* 9,986,340 36,000 Brookdale Senior Living, Inc.* 770,760 145,200 Chiquita Brands International, Inc.* 2,035,704 600 Cinemark Holdings, Inc. 10,344 3,000 Citi Trends, Inc.* 73,650 57,892 Concur Technologies, Inc.* 3,006,331 170,000 Copart, Inc.* 6,349,500 92,300 CoStar Group, Inc.* 5,312,788 231,700 Cubist Pharmaceuticals, Inc.* 4,958,380 7,000 Dealertrack Holdings, Inc.* 140,490 5,200 DexCom, Inc.* 70,980 809,950 Entropic Communications, Inc.* 9,784,196 3,100 Express, Inc.* 58,280 279,274 Exterran Holdings, Inc.* 6,688,612 109,800 Finisar Corp.* 3,259,962 264,000 Flir Systems, Inc.* 7,854,000 63,400 Fortinet, Inc.* 2,050,990 425,600 Geokinetics, Inc.* 3,953,824 128,900 Green Mountain Coffee Roasters, Inc.* 4,235,654 192,200 Hexcel Corp.* 3,476,898 255,600 Insulet Corp.* 3,961,800 15,000 Integrated Device Tech, Inc.* 99,900 2,300 IPC The Hospitalist Co., Inc.* 89,723 144,300 iShares Russell 2000 Growth Exchange Traded Fund 12,614,706 191,235 Lincare Holdings, Inc. 5,130,835 97,400 LogMeIn, Inc.* 4,318,716 66,900 Masimo Corp. 1,944,783 99,050 Monro Muffler Brake, Inc. 3,426,140 The accompanying notes are an integral part of these financial statements. 24 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 - ------------------------------------------------------------------------------- Shares Security Value - ------------------------------------------------------------------------------- 500 MSCI, Inc.* $ 19,480 50,800 MYR Group, Inc.* 1,066,800 154,000 Netlogic Microsystems, Inc.* 4,837,140 20,000 Orbitz Worldwide, Inc.* 111,800 17,200 Polypore International, Inc.* 700,556 82,500 Skechers U.S.A.* 1,650,000 10,300 SuccessFactors, Inc.* 298,288 50,500 Thoratec Corp.* 1,430,160 245,000 Titan Machinery, Inc.* 4,728,500 232,000 TiVo, Inc.* 2,002,160 155,200 TTM Technologies, Inc.* 2,314,032 9,800 Tupperware Brands Corp. 467,166 22,900 The Ultimate Software Group, Inc.* 1,113,627 12,700 Urban Outfitters, Inc.* 454,787 100 UTI Worldwide, Inc. 2,120 49,100 Vera Bradley, Inc.* 1,620,300 71,300 VistaPrint NV* 3,279,800 379,400 Vitacost.com, Inc.* 1,965,292 38,600 Vocus, Inc.* 1,067,676 - ------------------------------------------------------------------------------- Total $154,500,319 =============================================================================== (c) Securities lending collateral is managed by Credit Suisse AG, New York Branch. (d) Security is fair valued by management. (See Note 1A) Purchases and sales of securities (excluding temporary cash investments) for the year ended December 31, 2010 aggregated $689,734,619 and $813,491,981, respectively. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. Highest priority is given to Level 1 inputs and lowest priority is given to Level 3. Level 1 -- quoted prices in active markets for identical securities Level 2 -- other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.) Level 3 -- significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) Generally, equity securities are categorized as level 1. Securities valued using fair value methods (See Note 1A) are categorized as level 3. The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 25 Schedule of Investments | 12/31/10 (continued) The following is a summary of the inputs used as of December 31, 2010, in valuing the Fund's assets: - ---------------------------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total - ---------------------------------------------------------------------------------------------------- Common Stocks $621,523,537 $ -- $ -- $621,523,537 Common Stocks (Internet Retail) -- -- 1,989,814 1,989,814 Exchange traded fund 8,025,156 -- -- 8,025,156 Temporary Cash Investments -- 144,893,564 -- 144,893,564 Money Market Mutual Funds 14,490,156 -- -- 14,490,156 - ---------------------------------------------------------------------------------------------------- Total $644,038,849 $144,893,564 $1,989,814 $790,922,227 ==================================================================================================== Following is a reconciliation of assets using significant unobservable inputs (Level 3): - ------------------------------------------------------------------------------ Common Stocks - ------------------------------------------------------------------------------ Balance as of 12/31/09 $ -- Realized gain (loss) (1) -- Change in unrealized appreciation (depreciation) (2) -- Net purchases (sales) -- Transfers in and out of Level 3 1,989,814 - ------------------------------------------------------------------------------ Balance as of 12/31/10 $1,989,814 - ------------------------------------------------------------------------------ 1 Realized gain (loss) on these securities is Included in the net realized gain (loss) from investments in the Statement of Operations. 2 Unrealized appreciation (depreciation) on these securities is Included in the change in unrealized gain (loss) on investments in the Statement of Operations. Net change in unrealized depreciation of investments still held as of 12/31/10 $-- The accompanying notes are an integral part of these financial statements. 26 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 Statement of Assets and Liabilities | 12/31/10 ASSETS: Investment in securities (including securities loaned of $154,500,319) Cost ($648,752,389) $790,922,227 Cash 860,893 Receivables -- Investment securities sold 18,064,182 Fund shares sold 260,749 Dividends, interest and foreign taxes withheld 111,374 Other 29,521 - ---------------------------------------------------------------------------------------- Total assets $810,248,946 - ---------------------------------------------------------------------------------------- LIABILITIES: Payables -- Investment securities purchased $ 6,426,603 Fund shares repurchased 258,464 Upon return of securities loaned 159,383,720 Due to affiliates 208,503 Accrued expenses 104,730 - ---------------------------------------------------------------------------------------- Total liabilities $166,382,020 - ---------------------------------------------------------------------------------------- NET ASSETS: Paid-in capital $702,626,357 Accumulated net realized loss on investments (200,929,269) Net unrealized gain on investments 142,169,838 - ---------------------------------------------------------------------------------------- Total net assets $643,866,926 ======================================================================================== NET ASSET VALUE PER SHARE: (No par value, Unlimited number of shares authorized) Class A (based on $505,960,383/18,543,577 shares) $ 27.28 Class B (based on $28,463,755/1,228,215 shares) $ 23.17 Class C (based on $49,238,963/2,097,736 shares) $ 23.47 Class R (based on $10,676,703/392,491 shares) $ 27.20 Class Y (based on $49,527,122/1,760,775 shares) $ 28.13 MAXIMUM OFFERING PRICE: Class A ($27.28 [divided by] 94.25%) $ 28.94 ======================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 27 Statement of Operations For the Year Ended 12/31/10 INVESTMENT INCOME: Dividends $ 2,198,809 Interest and other income 70,492 Income from securities loaned, net 351,061 - ---------------------------------------------------------------------------------------- Total investment income $ 2,620,362 - ---------------------------------------------------------------------------------------- EXPENSES: Management fees $ 3,991,421 Transfer agent fees Class A 963,312 Class B 178,673 Class C 92,895 Class R 5,283 Class Y 3,207 Distribution fees Class A 1,167,942 Class B 330,544 Class C 477,950 Class R 51,615 Shareholder communications expense 660,613 Administrative reimbursements 191,704 Custodian fees 42,899 Registration expense 91,148 Professional fees 106,472 Printing expense 79,419 Fees and expenses of nonaffiliated trustees 18,938 Miscellaneous 44,562 - ---------------------------------------------------------------------------------------- Total expenses $ 8,498,597 - ---------------------------------------------------------------------------------------- Net expenses $ 8,498,597 - ---------------------------------------------------------------------------------------- Net investment loss $ (5,878,235) - ---------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN ON INVESTMENTS: Net realized gain on: Investments $82,569,030 Class actions 643,894 $ 83,212,924 - ---------------------------------------------------------------------------------------- Change in net unrealized gain on investments $ 32,391,293 - ---------------------------------------------------------------------------------------- Net gain on investments $115,604,217 - ---------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $109,725,982 ======================================================================================== The accompanying notes are an integral part of these financial statements. 28 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 Statement of Changes in Net Assets For the Years Ended 12/31/10 and 12/31/09, respectively - -------------------------------------------------------------------------------------------------- Year Ended Year Ended 12/31/10 12/31/09 - -------------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment loss $ (5,878,235) $ (1,892,735) Net realized gain (loss) on investments 83,212,924 (3,524,564) Change in net unrealized gain on investments 32,391,293 122,119,969 - -------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 109,725,982 $116,702,670 - -------------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sale of shares $ 56,980,953 $ 26,185,688 Shares issued in reorganization -- 384,615,214 Cost of shares repurchased (170,198,548) (95,667,556) - -------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets resulting from Fund share transactions $(113,217,595) $315,133,346 - -------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets $ (3,491,613) $431,836,016 NET ASSETS: Beginning of year 647,358,539 215,522,523 - -------------------------------------------------------------------------------------------------- End of year $ 643,866,926 $647,358,539 - -------------------------------------------------------------------------------------------------- Accumulated net investment loss $ -- $ -- - -------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 29 Statement of Changes in Net Assets (continued) - -------------------------------------------------------------------------------------------------------- '10 Shares '10 Amount '09 Shares '09 Amount - -------------------------------------------------------------------------------------------------------- Class A Shares sold 1,745,810 $ 41,972,597 896,454 $ 18,157,940 Shares issued in reorganization -- -- 10,825,861 228,425,673 Less shares repurchased (3,537,049) (84,539,417) (2,134,952) (42,790,352) - -------------------------------------------------------------------------------------------------------- Net increase (decrease) (1,791,239) $(42,566,820) 9,587,363 $203,793,261 ======================================================================================================== Class B Shares sold 79,271 $ 1,641,859 92,304 $ 1,649,214 Shares issued in reorganization -- -- 2,212,262 40,263,167 Less shares repurchased (942,538) (19,218,308) (295,984) (5,485,978) - -------------------------------------------------------------------------------------------------------- Net increase (decrease) (863,267) $(17,576,449) 2,008,582 $ 36,426,403 ======================================================================================================== Class C Shares sold 272,240 $ 5,688,243 167,011 $ 3,082,984 Shares issued in reorganization -- -- 2,624,567 48,320,960 Less shares repurchased (693,675) (14,477,584) (325,032) (6,147,991) - -------------------------------------------------------------------------------------------------------- Net increase (decrease) (421,435) $ (8,789,341) 2,466,546 $ 45,255,953 ======================================================================================================== Class R(a) Shares sold 146,300 $ 3,481,422 53,300 $ 1,167,112 Shares issued in reorganization -- -- 459,269 9,690,575 Less shares repurchased (215,068) (5,067,898) (51,310) (1,125,982) - -------------------------------------------------------------------------------------------------------- Net increase (decrease) (68,768) $ (1,586,476) 461,259 $ 9,731,705 ======================================================================================================== Class Y Shares sold 174,551 $ 4,196,832 104,241 $ 2,128,438 Shares issued in reorganization -- -- 2,682,484 57,914,839 Less shares repurchased (1,921,859) (46,895,341) (1,877,580) (40,117,253) - -------------------------------------------------------------------------------------------------------- Net increase (decrease) (1,747,308) $(42,698,509) 909,145 $ 19,926,024 ======================================================================================================== (a) Class R shares commenced operations on August 3, 2009 The accompanying notes are an integral part of these financial statements. 30 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 Financial Highlights - ---------------------------------------------------------------------------------------------------------------- Year Ended Year Ended 12/31/10 12/31/09 Class A Net asset value, beginning of period $ 22.81 $ 15.95 - ---------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations: Net investment loss $ (0.22) $ (0.07) Net realized and unrealized gain (loss) on investments 4.69 6.93 - ---------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 4.47 $ 6.86 Distributions to shareowners: Net realized gain -- -- - ---------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 4.47 $ 6.86 - ---------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 27.28 $ 22.81 ================================================================================================================ Total return* 19.60% 43.01% Ratio of net expenses to average net assets+ 1.29% 1.35% Ratio of net investment loss to average net assets+ (0.86)% (0.53)% Portfolio turnover rate 114% 140% Net assets, end of period (in thousands) $505,960 $463,880 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.29% 1.35% Net investment loss (0.86)% (0.53)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.29% 1.35% Net investment loss (0.86)% (0.53)% ================================================================================================================ - ----------------------------------------------------------------------------------------------------------------------------- Year Ended Year Ended Year Ended 12/31/08 12/31/07 12/31/06 - ----------------------------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of period $ 25.24 $ 28.81 $ 31.16 - ----------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations: Net investment loss $ (0.07) $ (0.20) $ (0.02) Net realized and unrealized gain (loss) on investments (8.91) (1.01) 1.45 - ----------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (8.98) $ (1.21) $ 1.43 Distributions to shareowners: Net realized gain (0.31) (2.36) (3.78) - ----------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (9.29) $ (3.57) $ (2.35) - ----------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 15.95 $ 25.24 $ 28.81 ============================================================================================================================= Total return* (35.39)% (3.90)% 4.78% Ratio of net expenses to average net assets+ 1.28% 1.17% 1.28% Ratio of net investment loss to average net assets+ (0.29)% (0.65)% (0.39)% Portfolio turnover rate 221% 104% 99% Net assets, end of period (in thousands) $171,415 $339,870 $428,128 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.28% 1.17% 1.28% Net investment loss (0.29)% (0.65)% (0.39)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.28% 1.16% 1.28% Net investment loss (0.28)% (0.64)% (0.39)% ============================================================================================================================= * 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. + Ratios with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 31 Financial Highlights (continued) - ---------------------------------------------------------------------------------------------------------------- Year Ended Year Ended 12/31/10 12/31/09 - ---------------------------------------------------------------------------------------------------------------- Class B Net asset value, beginning of period $ 19.60 $ 13.90 - ---------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations: Net investment loss $ (0.55) $ (0.11) Net realized and unrealized gain (loss) on investments 4.12 5.81 - ---------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 3.57 $ 5.70 Distributions to shareowners: Net realized gain -- -- - ---------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 3.57 $ 5.70 - ---------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 23.17 $ 19.60 ================================================================================================================ Total return* 18.21% 41.01% Ratio of net expenses to average net assets+ 2.45% 2.58% Ratio of net investment loss to average net assets+ (2.03)% (1.54)% Portfolio turnover rate 114% 140% Net assets, end of period (in thousands) $28,464 $40,989 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 2.45% 2.58% Net investment loss (2.03)% (1.54)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 2.45% 2.58% Net investment loss (2.03)% (1.54)% ================================================================================================================ - ---------------------------------------------------------------------------------------------------------------------------- Year Ended Year Ended Year Ended 12/31/08 12/31/07 12/31/06 - ---------------------------------------------------------------------------------------------------------------------------- Class B Net asset value, beginning of period $ 22.42 $26.19 $28.94 - ---------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations: Net investment loss $ (0.39) $(0.48) $(0.48) Net realized and unrealized gain (loss) on investments (7.82) (0.93) 1.51 - ---------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (8.21) $(1.41) $ 1.03 Distributions to shareowners: Net realized gain (0.31) (2.36) (3.78) - ---------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (8.52) $(3.77) $(2.75) - ---------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 13.90 $22.42 $26.19 ============================================================================================================================ Total return* (36.41)% (5.06)% 3.74% Ratio of net expenses to average net assets+ 2.84% 2.40% 2.40% Ratio of net investment loss to average net assets+ (1.86)% (1.88)% (1.67)% Portfolio turnover rate 221% 104% 99% Net assets, end of period (in thousands) $ 1,153 $2,385 $3,145 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 2.84% 2.40% 2.40% Net investment loss (1.86)% (1.88)% (1.67)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 2.82% 2.37% 2.38% Net investment loss (1.84)% (1.85)% (1.65)% ============================================================================================================================ * 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. + Ratios with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. 32 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 - ---------------------------------------------------------------------------------------------------------------- Year Ended Year Ended 12/31/10 12/31/09 - ---------------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of period $ 19.81 $ 14.02 - ---------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations: Net investment loss $ (0.42) $ (0.09) Net realized and unrealized gain (loss) on investments 4.08 5.88 - ---------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 3.66 $ 5.79 Distributions to shareowners: Net realized gain -- -- - ---------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 3.66 $ 5.79 - ---------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 23.47 $ 19.81 ================================================================================================================ Total return* 18.48% 41.30% Ratio of net expenses to average net assets+ 2.26% 2.39% Ratio of net investment loss to average net assets+ (1.83)% (1.33)% Portfolio turnover rate 114% 140% Net assets, end of period (in thousands) $49,239 $49,845 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 2.26% 2.39% Net investment loss (1.83)% (1.33)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 2.26% 2.39% Net investment loss (1.83)% (1.33)% ================================================================================================================ - -------------------------------------------------------------------------------------------------------------------------- Year Ended Year Ended Year Ended 12/31/08 12/31/07 12/31/06 - -------------------------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of period $ 22.57 $26.32 $29.01 - -------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations: Net investment loss $ (0.27) $(0.46) $(0.36) Net realized and unrealized gain (loss) on investments ( 7.97) (0.93) 1.45 - -------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (8.24) $(1.38) $ 1.09 Distributions to shareowners: Net realized gain ( 0.31) (2.36) (3.78) - -------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (8.55) $(3.75) $(2.69) - -------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 14.02 $22.57 $26.32 ========================================================================================================================== Total return* (36.30)% (4.96)% 3.93% Ratio of net expenses to average net assets+ 2.65% 2.22% 2.27% Ratio of net investment loss to average net assets+ (1.64)% (1.70)% (1.52)% Portfolio turnover rate 221% 104% 99% Net assets, end of period (in thousands) $ 696 $1,042 $1,381 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 2.65% 2.22% 2.27% Net investment loss (1.64)% (1.70)% (1.52)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 2.64% 2.20% 2.26% Net investment loss (1.63)% (1.68)% (1.51)% ========================================================================================================================== * 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. + Ratios with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 33 Financial Highlights (continued) - ------------------------------------------------------------------------------------------ Year Ended 8/3/09 to 12/31/10 12/31/09 (a) - ------------------------------------------------------------------------------------------ Class R Net asset value, beginning of period $ 22.80 $ 20.45 - ------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment loss $ (0.29) $ (0.04) Net realized and unrealized gain on investments 4.69 2.39 - ------------------------------------------------------------------------------------------ Net increase from investment operations $ 4.40 $ 2.35 - ------------------------------------------------------------------------------------------ Net increase in net asset value $ 4.40 $ 2.35 - ------------------------------------------------------------------------------------------ Net asset value, end of period $ 27.20 $ 22.80 ========================================================================================== Total return* 19.30% 11.49%(b) Ratio of net expenses to average net assets+ 1.55% 1.58%** Ratio of net investment loss to average net assets+ (1.12)% (0.49)%** Portfolio turnover rate 114% 140%** Net assets, end of period (in thousands) $10,677 $10,515 Ratios with reduction for fees paid indirectly: Net expenses 1.55% 1.58%** Net investment loss (1.12)% (0.49)%** ========================================================================================== (a) Class R shares were first publicly offered on August 3, 2009. (b) Not Annualized. * 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 each end of each period. ** Annualized. + Ratio with no reduction for fees paid indirectly. 34 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 - ---------------------------------------------------------------------------------------------------------------- Year Ended Year Ended 12/31/10 12/31/09 - ---------------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 23.39 $ 16.26 - ---------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations: Net investment gain (loss) $ (0.11) $ 0.01(a) Net realized and unrealized gain (loss) on investments 4.85 7.13 - ---------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 4.74 $ 7.13 Distributions to shareowners: Net realized gain -- -- - ---------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 4.74 $ 7.13 - ---------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 28.13 $ 23.39 ================================================================================================================ Total return* 20.26% 43.85% Ratio of net expenses to average net assets+ 0.76% 0.77% Ratio of net investment income (loss) to average net assets+ (0.34)% (0.04)% Portfolio turnover rate 114% 140% Net assets, end of period (in thousands) $49,527 $82,061 Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.76% 0.77% Net investment income (loss) (0.34)% 0.04% ================================================================================================================ - --------------------------------------------------------------------------------------------------------------------------- Year Ended Year Ended Year Ended 12/31/08 12/31/07 12/31/06 - --------------------------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 25.59 $ 29.05 $ 31.19 - --------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations: Net investment gain (loss) $ 0.05 $ (0.06) $ 0.01 Net realized and unrealized gain (loss) on investments (9.07) (1.04) 1.63 - --------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (9.02) $ (1.10) $ 1.64 Distributions to shareowners: Net realized gain (0.31) (2.36) (3.78) - --------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (9.33) $ (3.46) $ (2.14) - --------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 16.26 $ 25.59 $ 29.05 =========================================================================================================================== Total return* (35.06)% (3.48)% 5.46% Ratio of net expenses to average net assets+ 0.79% 0.71% 0.72% Ratio of net investment income (loss) to average net assets+ 0.23% (0.19)% 0.00% Portfolio turnover rate 221% 104% 99% Net assets, end of period (in thousands) $42,259 $75,001 $139,415 Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.79% 0.71% 0.70% Net investment income (loss) 0.23% (0.19)% 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. + Ratios with no reduction for fees paid indirectly. (a) The amount shown for share outstanding does not correspond with the net investment loss on the Statement of Operations for the period due to the timing of sales and repurchases of shares. The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 35 Notes to Financial Statements | 12/31/10 1. Organization and Significant Accounting Policies Pioneer Growth Opportunities Fund (the Fund) is one of three series comprising Pioneer Series Trust II, a Delaware statutory trust. The Fund is registered under the Investment Company Act of 1940 as a diversified, open-end management investment company. The investment objective of the Fund is growth of capital. The Fund offers five classes of shares designated as Class A, Class B, Class C, Class R, and Class Y shares. Class R shares were first publicly offered on August 3, 2009. Class Y shares were first publicly offered on September 23, 2005. Effective as of the close of business on December 31, 2009, Class B shares are no longer offered to new or existing shareholders, except that dividends and/or capital gain distributions may continue to be reinvested in Class B shares, and shareholders may exchange their Class B shares for Class B shares of other Pioneer funds, as permitted by existing exchange privileges. Each class of shares represents an interest in the same portfolio of investments of the Fund and has identical rights (based on relative net asset values) to assets and liquidation proceeds. Share classes can bear different rates of class-specific fees and expenses such as transfer agent and distribution fees. Differences in class-specific fees and expenses will result in differences in net investment income and, therefore, the payment of different dividends from net investment income earned by each class. The Amended and Restated Declaration of Trust of the Fund gives the Board the flexibility to specify either per share voting or dollar-weighted voting when submitting matters for shareholder approval. Under per share voting, each share of a class of the Fund is entitled to one vote. Under dollar-weighted voting, a shareholder's voting power is determined not by the number of shares owned, but by the dollar value of the shares on the record date. Each share class has exclusive voting rights with respect to matters affecting only that class, including with respect to the distribution plan for that class. There is no distribution plan for Class Y shares. Class B shares convert to Class A shares approximately eight years after the date of purchase. At times, the Fund's investments may represent industries or industry sectors that are interrelated or have common risks, making the Fund more susceptible to any economic, political, or regulatory developments or other risks affecting those industries and sectors. The Fund's prospectus contains unaudited information regarding the Fund's principal risks. Please refer to that document when considering the Fund's principal risks. The Fund's financial statements have been prepared in conformity with U.S. generally accepted accounting principles that require the management of the 36 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 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 gain or loss on investments during the reporting period. 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 that have traded on an exchange are valued at the last sale price on the principal exchange where they are traded. Securities that have not traded on the date of valuation, or securities for which sale prices are not available, generally are valued at the mean between the last bid and asked prices. Securities for which market prices and/or quotations are not readily available or are considered to be unreliable are valued using fair value methods pursuant to procedures adopted by 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 may use fair value methods if it is determined that a significant event has occurred after the close of the exchange or market on which the security trades and prior to the determination of the Fund's net asset value. Thus, the valuation of the Fund's securities may differ from exchange prices. At December 31, 2010, one security was valued using fair value methods (in addition to securities that were valued using prices supplied by independent pricing services) representing 0.31% of net assets. Inputs used when applying fair value methods to value a security may include credit ratings, the financial condition of the company, current market conditions and comparable securities. Short-term fixed income securities with remaining maturities of sixty days or less generally are valued at amortized cost. Money market mutual funds are valued at net asset value. 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 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 37 data in the exercise of reasonable diligence. Interest income, including interest on income bearing cash accounts, is recorded on the accrual basis. Dividend and interest income are reported 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. Foreign Currency Translation The books and records of the Fund are maintained in U.S. dollars. Amounts denominated in foreign currencies are translated into U.S. dollars using current exchange rates. Net realized gains and losses on foreign currency transactions, if any, represent, among other things, the net realized gains and losses on foreign currency contracts, disposition of foreign currencies and the difference between the amount of income accrued and the U.S. dollars actually received. Further, the effects of changes in foreign currency exchange rates on investments are not segregated in the statement of operations from the effects of changes in market price of those securities but are included with the net realized and unrealized gain or loss on investments. C. 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 tax provision is required. Tax years for the prior three fiscal years remain subject to examination by tax authorities. The amounts and characterizations of distributions to shareowners for financial reporting purposes are determined in accordance with federal income tax rules. Therefore, the source of the Portfolio's distributions may be shown in the accompanying financial statements as from or in excess of net investment income or as from net realized gain on investment transactions, or as from paid-in capital, depending on the type of book/tax differences that may exist. At December 31, 2010, the Fund had a net capital loss carryforward of $194,800,639, of which, the following amounts will expire between 2015 and 2017 if not utilized: $2,408,096 in 2015, $164,995,103 in 2016 and $27,397,440 in 2017. Included in this amount is $65,997,890 of capital losses which, as a result of the reorganizations with Pioneer Small Cap Value Fund on August 28, 2009 may be subject to limitations imposed by the Internal Revenue Code. At December 31, 2010, the Fund has reclassified $5,878,235 to decrease accumulated net investment loss and $5,878,235 to decrease Paid-in capital 38 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 to reflect permanent book/tax differences. The reclassification has no impact on the net assets of the Fund and presents the Fund's capital accounts on a tax basis. There were no distributions paid during the years ended December 31, 2010 and December 31, 2009. The following shows the components of distributable earnings on a federal income tax basis at December 31, 2010: - -------------------------------------------------------------------------------- 2010 - -------------------------------------------------------------------------------- Distributable earnings: Capital loss carryforward $(194,800,639) Unrealized appreciation 136,041,208 - -------------------------------------------------------------------------------- Total $ (58,759,431) ================================================================================ The difference between book basis and tax basis unrealized appreciation is attributable to the tax deferral of losses on wash sales. D. 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 UniCredit S.p.A. (UniCredit), earned approximately $24,351 in underwriting commissions on the sale of Class A shares during the year ended December 31, 2010. During the year ended December 31, 2010 the Fund recognized gains of $643,894 in settlement of class action lawsuits from several different companies, as reflected on the Statement of Operations. E. Class Allocations Income, common expenses and realized and unrealized gains and losses are calculated at the Fund level and allocated daily to each class of shares based on its respective percentage of adjusted net assets at the beginning of the day. 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). Class Y shares do not pay distribution fees. All expenses and fees paid to the transfer agent, Pioneer Investment Management Shareholder Services, Inc. (PIMSS), for its services are allocated among the classes of shares based on the number of accounts in each class and the ratable allocation of related out-of-pocket expenses (see Note 3.) 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 and at the same time, except that net investment Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 39 income dividends to Class A, Class B, Class C, Class R and Class Y shares can reflect different transfer agent and distribution expense rates. F. Securities Lending The Fund lends securities in its portfolio to certain broker-dealers or other institutional investors. When entering into a securities loan transaction, the Fund typically receives cash collateral from the borrower equal to at least the value of the securities loaned, which is invested in temporary investments. Credit Suisse AG, New York Branch, as the Fund's securities lending agent, manages the Fund's securities lending collateral. The income earned on the investment of collateral is shared with the borrower and the lending agent in payment of any rebate due to the borrower with respect to the securities loan, and in compensation for the lending agent's services to the Fund. The Fund also continues to receive payments in lieu of dividends or interest on the securities loaned. Gain or loss on the value of the loaned securities that may occur during the term of the loan will be for the account of the Fund. The amount of the collateral is required to be adjusted daily to reflect any price fluctuation in the value of the loaned securities. If the required market value of the collateral is less than the value of the loaned securities, the borrower is required to deliver additional collateral for the account of the Fund prior to the close of business on that day. The Fund has the right, under the lending agreement, to terminate the loan and recover the securities from the borrower with prior notice. The Fund is required to return the cash collateral to the borrower and could suffer a loss if the value of the collateral, as invested, has declined. G. Repurchase Agreements With respect to repurchase agreements entered into by the Fund, the value of the underlying securities (collateral), including accrued interest, is required to be equal to or in excess of the repurchase price. The collateral for all repurchase agreements is held in safekeeping in the customer-only account of the Fund's custodian or a subcustodian of the Fund. 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. H. Option Writing The funds may buy and sell put and call options, or write put and covered call options on portfolio securities in order to produce incremental earning or protect against changes in the value of portfolio securities. The funds generally purchase put options or write covered call options to hedge against adverse movements in the value of portfolio holdings. When an option is written, the Fund receives a premium and becomes obligated to sell or purchase the underlying security at a fixed price, upon the exercise of the 40 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 option. 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 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. For the year ended December 31, 2010 there were no transactions in written options. 2. Management Agreement PIM, a wholly owned indirect subsidiary of UniCredit, manages the Fund's portfolio. Management fees are calculated daily at the annual rate of 0.65% of the Fund's average daily net assets. 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 as administrative reimbursements. Included in "Due to Affiliates" reflected on the Statement of Assets and Liabilities is $14,392 in management fees, administrative costs and certain other reimbursements payable to PIM at December 31, 2010. 3. Transfer Agent PIMSS, a wholly owned indirect subsidiary of UniCredit, provides substantially all transfer agent and shareowner services to the Fund at negotiated rates. In addition, the Fund reimburses PIMSS for out-of-pocket expenses incurred by PIMSS related to shareholder communications activities such as proxy and statement mailings, outgoing phone calls and omnibus relationship contracts. For the year ended December 31, 2010 such out-of-pocket expenses by class of shares were as follows: - -------------------------------------------------------------------------------- Shareholder Communications: - -------------------------------------------------------------------------------- Class A $419,254 Class B 54,294 Class C 154,532 Class R 26,314 Class Y 6,219 - -------------------------------------------------------------------------------- Total $660,613 ================================================================================ Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 41 Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $188,338 in transfer agent fees and out-of-pocket reimbursements payable to PIMSS at December 31, 2010. 4. Distribution and Service Plans The Fund has adopted a Distribution Plan pursuant to Rule 12b-1 of the Investment Company Act of 1940 with respect to its Class A, Class B, Class C and Class R shares. Pursuant to the Plan, the Fund pays PFD 0.25% of the average daily net assets attributable to Class A shares as compensation for personal services and/or account maintenance services or distribution services with regard to Class A shares. Pursuant to the Plan, the Fund also pays PFD 1.00% of the average daily net assets attributable to Class B and Class C shares. The fee for Class B and Class C shares 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 Plan, the Fund further pays PFD 0.50% of the average daily net assets attributable to Class R shares for distribution services. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $5,773 in distribution fees payable to PFD at December 31, 2010. 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 R and Class Y shares) may be subject to a contingent deferred sales charge (CDSC). A CDSC of 1.00% may be imposed on redemptions of certain net asset value purchases of Class A shares within 18 months of purchase (within 12 months for purchases made on or after April 1, 2009). Class B shares 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%, based on the lower of cost or market value of shares being redeemed. Shares purchased as part of an exchange remain subject to any CDSC that applied to the original purchase of those shares. There is no CDSC for Class R or Class Y shares. Proceeds from the CDSCs are paid to PFD. For the year ended December 31, 2010, CDSCs in the amount of $60,502 were paid to PFD. 42 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 5. Expense Offset Arrangements 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 year ended December 31, 2010, the Fund's expenses were not reduced under such arrangements. 6. Line of Credit Facility The Fund, along with certain other funds in the Pioneer Family of Funds (the Funds), participates in a $165 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 the amount available under the facility or the limits set for borrowing by the Fund's prospectus and the 1940 Act. Interest on borrowings is payable at the higher of the London Interbank Offered Rate (LIBOR) on the borrowing date plus 1.25% on an annualized basis or the Federal Funds Rate on the borrowing date plus 1.25% on an annualized basis. The Funds pay an annual commitment fee for this facility. The commitment fee is allocated among participating Funds based on an allocation schedule set forth in the credit agreement. For the year ended December 31, 2010, the Fund had no borrowings under this agreement. 7. Reorganization Information Pioneer Small Cap Value Fund was reorganized into Pioneer Growth Opportunities Fund on August 28, 2009. The purpose of this transaction was to combine two funds (managed by PIM) with similar investment objectives and strategies. This tax-free reorganization was accomplished by exchanging the assets and liabilities of Pioneer Small Cap Value Fund for shares of Pioneer Growth Opportunities Fund. Shareowners holding Class A, Class B, Class C, Class R and Class Y shares of Pioneer Small Cap Value Fund received Class A, Class B, Class C, Class R and Class Y shares, respectively, of Pioneer Growth Opportunities Fund in the reorganization. The investment portfolio of Pioneer Small Cap Value Fund, with a value of $398,937,998 and an identified cost of $401,928,323 at August 28, 2009, was the principal asset acquired by Pioneer Growth Opportunities Fund. For financial reporting purposes, assets received by Pioneer Growth Opportunities Fund were valued using closing market prices or available market quotations, and shares issued by Pioneer Growth Opportunities Fund were recorded at net asset value; however, the cost basis of the investments received from Pioneer Small Cap Value Fund was carried forward to align ongoing reporting of Pioneer Growth Opportunities Fund's realized and unrealized gains and losses with amounts distributable to shareowners for tax purposes. The following charts show the details of the reorganization as of the Closing Date: Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 43 - ----------------------------------------------------------------------------------------------- Pioneer Growth Pioneer Small Pioneer Growth Opportunities Fund Cap Value Fund Opportunities Fund (Pre-Reorganization) (Pre-Reorganization) (Post-Reorganization) - ----------------------------------------------------------------------------------------------- Net Assets Class A $218,381,748 $228,425,673 $446,807,421 Class B $ 1,648,142 $ 40,263,167 $ 41,911,309 Class C $ 1,422,914 $ 48,320,960 $ 49,743,874 Class R $ 15,967 $ 9,690,575 $ 9,706,542 Class Y $ 44,450,812 $ 57,914,839 $102,365,651 - ----------------------------------------------------------------------------------------------- Total Net Assets $265,919,583 $384,615,214 $650,534,797 =============================================================================================== Shares Outstanding Class A 10,352,091 12,876,615 21,177,952 Class B 90,538 2,656,995 2,302,800 Class C 77,379 2,968,545 2,704,946 Class R 757 553,775 460,026 Class Y 2,058,821 3,144,680 4,741,305 Shares Issued in Reorganization Class A -- -- 10,825,861 Class B -- -- 2,212,262 Class C -- -- 2,627,567 Class R -- -- 459,269 Class Y -- -- 2,682,484 - ----------------------------------------------------------------------------------------------- Unrealized Accumulated Appreciation On Loss On Closing Date Closing Date - ----------------------------------------------------------------------------------------------- Pioneer Small Cap Value Fund $(2,990,325) $(185,381,897) Assuming the reorganization had been completed on January 1, 2009, the beginning of the annual reporting period for Pioneer Growth Opportunities Fund, Pioneer Growth Opportunities Fund's pro forma results of operations for the year ended December 31, 2009, are as follows: Net investment loss $ (2,904,210) Net gain on investments 186,349,060 - ------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 183,444,850 ===================================================================================== 8. Subsequent Events In preparing these financial statements, PIM has evaluated the impact of all events and transactions for potential recognition or disclosure and has determined that there were no subsequent events requiring recognition or disclosure in the financial statements. 44 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 Report of Independent Registered Public Accounting Firm To the Board of Trustees of Pioneer Series Trust II and Shareowners of Pioneer Growth Opportunities Fund: - -------------------------------------------------------------------------------- We have audited the accompanying statement of assets and liabilities, including the schedule of investments, of Pioneer Growth Opportunities Fund, one of the series comprising Pioneer Series Trust II (the "Trust"), as of December 31, 2010, and the related statement of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, and the financial highlights for each of the periods indicated therein. These financial statements and financial highlights are the responsibility of the Trust's management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. We were not engaged to perform an audit of the Trust's internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Trust's internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements and financial highlights, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our procedures included confirmation of securities owned as of December 31, 2010, by correspondence with the custodian and brokers or by other appropriate audit procedures where replies from brokers were not received. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the financial position of Pioneer Growth Opportunities Fund of Pioneer Series Trust II at December 31, 2010, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended, and financial highlights for each of the periods indicated therein, in conformity with U.S. generally accepted accounting principles. Ernst & Young LLP Boston, Massachusetts February 25, 2011 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 45 Approval of Investment Advisory Agreement Pioneer Investment Management, Inc. (PIM) serves as investment adviser to Pioneer Growth Opportunities Fund (the Fund) pursuant to an investment advisory agreement between PIM and the Fund. In order for PIM to remain the investment adviser of the Fund, the Trustees of the Fund must determine annually whether to renew the investment advisory agreement for the Fund. The contract review process began in March 2010 as the Trustees of the Fund agreed on, among other things, an overall approach and timeline for the process. In July 2010, the Trustees approved the format of the contract review materials and submitted their formal request to PIM to furnish information necessary to evaluate the terms of the investment advisory agreement. The contract review materials were provided to the Trustees in September 2010. After reviewing and discussing the materials, the Trustees submitted a request for additional information to PIM, and materials were provided in response to this request. Meetings of the independent Trustees of the Fund were held in July, September, October, and November, 2010 to review and discuss the contract review materials. In addition, the Trustees took into account the information related to the Fund provided to the Trustees at each regularly scheduled meeting. At a meeting held on November 16, 2010, based on their evaluation of the information provided by PIM and third parties, the Trustees of the Fund, including the independent Trustees voting separately, unanimously approved the renewal of the investment advisory agreement for another year. In considering the renewal of the investment advisory agreement, the Trustees considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the renewal of the agreement. Nature, Extent and Quality of Services The Trustees considered the nature, extent and quality of the services that had been provided by PIM to the Fund, taking into account the investment objective and strategy of the Fund. The Trustees reviewed the terms of the investment advisory agreement. The Trustees also reviewed PIM's investment approach for the Fund, its research process and its process for trade execution. The Trustees considered the resources of PIM and the personnel of PIM who provide investment management services to the Fund. The Trustees considered the non-investment resources and personnel of PIM involved in PIM's services to the Fund, including PIM's compliance and legal resources and personnel. In addition, the Trustees considered the arrangements put in place to retain key investment and other personnel. The Trustees also considered the substantial 46 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 attention and high priority given by PIM's senior management to the Pioneer fund complex. The Trustees considered that PIM supervises and monitors the performance of the Fund's service providers and provides the Fund with personnel (including Fund officers) and other resources that are necessary for the Fund's business management and operations. The Trustees also considered that, as administrator, PIM is responsible for the administration of the Fund's business and other affairs. The Trustees considered the fees paid to PIM for the provision of administration services. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that had been provided by PIM to the Fund were satisfactory and consistent with the terms of the investment advisory agreement. Performance of the Fund The Trustees considered the performance results of the Fund over various time periods. They reviewed information comparing the Fund's performance with the performance of its peer group of funds as classified by Morningstar, Inc. (Morningstar), an independent provider of investment company data, and with the performance of the Fund's benchmark index. The Trustees considered that the Fund's annualized total return was in the fourth quintile of its Morningstar category for the one and five year periods ended June 30, 2010, and in the second quintile of its Morningstar category for the three and ten year periods ended June 30, 2010. (In all quintile rankings referred to throughout this disclosure, first quintile is most favorable to the Fund's shareowners. Thus, highest relative performance would be first quintile and lowest relative expenses would also be first quintile.) The Trustees discussed the Fund's recent underperformance with PIM and were satisfied with the information presented by PIM with respect to the Fund's performance. Management Fee and Expenses The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees of its peer group of funds as classified by Morningstar and the expense ratios of a peer group of funds selected on the basis of criteria determined by the independent Trustees for this purpose using data provided by Strategic Insight Mutual Trust Research and Consulting, LLC (Strategic Insight), an independent third party. The Trustees considered that the Fund's management fee for the twelve months ended June 30, 2010 was in the first quintile relative to the management fees paid by other funds in its Morningstar peer group for the comparable period. The Trustees also considered that the Fund's expense ratio for the twelve months ended June 30, 2010 was in the second quintile relative to its Strategic Insight peer group for the comparable period. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 47 The Trustees also reviewed management fees charged by PIM to its institutional and other clients. In evaluating the fees associated with PIM's client accounts, the Trustees took into account the respective demands, resources and complexity associated with the Fund and client accounts. The Trustees noted that in some instances the fee rates for those clients were lower than the management fee for the Fund and considered that, under the investment advisory agreement with the Fund, PIM performs additional services for the Fund that it does not provide to those other clients or services that are broader in scope, including oversight of the Fund's other service providers and activities related to compliance and the extensive regulatory and tax regimes to which the Fund is subject. The Trustees concluded that the management fee payable by the Fund to PIM was reasonable in relation to the nature and quality of the services provided by PIM. The Trustees also concluded that the Fund's expense ratio was reasonable taking into account the nature and quality of services provided by PIM. Profitability The Trustees considered information provided by PIM regarding the profitability of PIM with respect to the advisory services provided by PIM to the Fund, including the methodology used by PIM in allocating certain of its costs to the management of the Fund. The Trustees also considered PIM's profit margin in connection with the overall operation of the Fund. They further reviewed the financial results realized by PIM and its affiliates from non-fund businesses. The Trustees considered PIM's profit margins with respect to the Fund in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees concluded that PIM's profitability with respect to the management of the Fund was not unreasonable. Economies of Scale The Trustees considered PIM's views relating to economies of scale in connection with the Pioneer Funds as fund assets grow and the extent to which any such economies of scale are shared with funds and fund shareholders. The Trustees recognize that economies of scale are difficult to identify and quantify and that, among other factors that may be relevant, are the following: fee levels, expense subsidization, investment by PIM in research and analytical capabilities and PIM's commitment and resource allocation to the Funds. The Trustees noted that profitability also may be an indicator of the availability of any economies of scale, although profitability may vary for other reasons particularly, for example during the recent difficult periods for financial markets, as the level of services was maintained notwithstanding a significant decline in PIM's fee revenues from the Funds. Accordingly, the Trustees concluded that economies of scale, if any, were being appropriately shared with the Fund. 48 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 Other Benefits The Trustees considered the other benefits to PIM from its relationship with the Fund. The Trustees considered the character and amount of fees paid by the Fund, other than under the investment advisory agreement, for services provided by PIM and its affiliates. The Trustees further considered the revenues and profitability of PIM's businesses other than the fund business. The Trustees also considered the benefits to the Fund and to PIM and its affiliates from the use of "soft" commission dollars generated by the Fund to pay for research and brokerage services. The Trustees considered the intangible benefits to PIM by virtue of its relationship with the Fund and the other Pioneer funds. The Trustees concluded that the receipt of these benefits was reasonable in the context of the overall relationship between PIM and the Fund. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including all of the independent Trustees, concluded that the investment advisory agreement between PIM and the Fund, including the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of the investment advisory agreement for the Fund. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 49 Trustees, Officers and Service Providers Investment Adviser Pioneer Investment Management, Inc. Custodian Brown Brothers Harriman & Co. Independent Registered Public Accounting Firm Ernst & Young LLP Principal Underwriter Pioneer Funds Distributor, Inc. Legal Counsel Bingham McCutchen 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 12-month period ended June 30 is publicly available to shareowners at www.pioneerinvestments.com. This information is also available on the Securities and Exchange Commission's web site at http://www.sec.gov. Trustees and Officers The Fund's Trustees and officers are listed below, together with their principal occupations during at least the past five years. Trustees who are interested persons of the Fund within the meaning of the 1940 Act are referred to as Interested Trustees. Trustees who are not interested persons of the Fund are referred to as Independent Trustees. Each of the Trustees, except Mr. West, serves as a trustee of each of the 56 U.S. registered investment portfolios for which Pioneer serves as investment adviser (the "Pioneer Funds"). Mr. West serves as a trustee of 44 U.S. registered investment portfolios for which Pioneer serves as investment adviser. The address for all Trustees and all officers of the fund is 60 State Street, Boston, Massachusetts 02109. The Statement of Additional Information of the Fund includes additional information about the Trustees and is available, without charge, upon request, by calling 1-800-225-6292. 50 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 Interested Trustees - -------------------------------------------------------------------------------- Position Held Length of Service Name and Age with the Fund and Term of Office - -------------------------------------------------------------------------------- John F. Cogan, Jr. (84)* Chairman of the Board, Trustee since 2004. Trustee and President Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- Daniel K. Kingsbury (52)* Trustee and Executive Trustee since 2007. Vice President Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- * Mr. Cogan and Mr. Kingsbury are Interested Trustees because they are officers or directors of the Fund's investment adviser and certain of its affiliates. - ------------------------------------------------------------------------------------------------------------------- Other Directorships Name and Age Principal Occupation Held by this Trustee - ------------------------------------------------------------------------------------------------------------------- John F. Cogan, Jr. (84)* Non-Executive Chairman and a director of Pioneer Investment None Management USA Inc. ("PIM-USA"); Chairman and a director of Pioneer; Chairman and Director of Pioneer Institutional Asset Management, Inc. (since 2006); Director of Pioneer Alternative Investment Management Limited (Dublin); President and a director of Pioneer Alternative Investment Management (Bermuda) Limited and affiliated funds; Deputy Chairman and a director of Pioneer Global Asset Management S.p.A. ("PGAM") (until April 2010); Director of PIOGLOBAL Real Estate Investment Fund (Russia) (until June 2006); Director of Nano-C, Inc. (since 2003); Director of Cole Management Inc. (since 2004); Director of Fiduciary Counseling, Inc.; President and Director of Pioneer Funds Distributor, Inc. ("PFD") (until May 2006); President of all of the Pioneer Funds; and Of Counsel, Wilmer Cutler Pickering Hale and Dorr LLP - ------------------------------------------------------------------------------------------------------------------- Daniel K. Kingsbury (52)* Director, CEO and President of PIM-USA (since February None 2007); Director and President of Pioneer and Pioneer Institutional Asset Management, Inc. (since February 2007); Executive Vice President of all of the Pioneer Funds (since March 2007); Director of PGAM (2007 - 2010); Head of New Europe Division, PGAM (2000 - 2005); and Head of New Markets Division, PGAM (2005 - 2007) - ------------------------------------------------------------------------------------------------------------------- * Mr. Cogan and Mr. Kingsbury are Interested Trustees because they are officers or directors of the Fund's investment adviser and certain of its affiliates. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 51 Independent Trustees - ----------------------------------------------------------------- Position Held Length of Service and Name and Age with the Fund Term of Office - ----------------------------------------------------------------- David R. Bock (67) Trustee Trustee since 2005. Serves until a successor trustee is elected or earlier retirement or removal. - ----------------------------------------------------------------- Mary K. Bush (62) Trustee Trustee since 2004. Serves until a successor trustee is elected or earlier retirement or removal. - ------------------------------------------------------------------------------------------------------------------- Other Directorships Held Name and Age Principal Occupation by this Trustee - ------------------------------------------------------------------------------------------------------------------- David R. Bock (67) Managing Partner, Federal City Capital Advisors (corporate Director of Enterprise advisory services company) (1997 - 2004 and 2008 - Community Investment, Inc. present); Interim Chief Executive Officer, Oxford Analytica, (privately held affordable Inc. (privately held research and consulting company) housing finance company) (2010); Executive Vice President and Chief Financial Officer, (1985 - 2010); Director of I-trax, Inc. (publicly traded health care services company) Oxford Analytica, Inc. (2008 (2004 - 2007); and Executive Vice President and Chief - present); Director of The Financial Officer, Pedestal Inc. (internet-based mortgage Swiss Helvetia Fund, Inc. trading company) (2000 - 2002) (closed-end fund) (2010 - present); and Director of New York Mortgage Trust (publicly traded mortgage REIT) (2004 - 2009) - ------------------------------------------------------------------------------------------------------------------- Mary K. Bush (62) Chairman, Bush International, LLC (international financial Director of Marriott advisory firm) (1991 - present); Senior Managing Director, International, Inc. (2008 - Brock Capital Group, LLC (strategic business advisors) (2010 present); Director of - present); Managing Director, Federal Housing Finance Discover Financial Services Board (oversight of Federal Home Loan Bank system) (1989 (credit card issuer and - 1991); Vice President and Head of International Finance, electronic payment services) Federal National Mortgage Association (1988 - 1989); U.S. (2007 - present); Former Alternate Executive Director, International Monetary Fund Director of Briggs & Stratton (1984 - 1988); Executive Assistant to Deputy Secretary of Co. (engine manufacturer) the U.S. Treasury, U.S. Treasury Department (1982 - 1984); (2004 - 2009); Former and Vice President and Team Leader in Corporate Banking, Director of UAL Corporation Bankers Trust Co. (1976 - 1982) 52 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 - ---------------------------------------------------------------------------------------------------------------------------- Position Held Length of Service and Other Directorships Held Name and Age with the Fund Term of Office Principal Occupation by this Trustee - ---------------------------------------------------------------------------------------------------------------------------- Mary K. Bush (62) (continued) (airline holding company) (2006 - 2010); Director of ManTech International Corporation (national security, defense, and intelligence technology firm) (2006 - present); Member, Board of Governors, Investment Company Institute (2007 - present); Member, Board of Governors, Independent Directors Council (2007 - present); Former Director of Brady Corporation (2000 - 2007); Former Director of Mortgage Guaranty Insurance Corporation (1991 - 2006); Former Director of Millennium Chemicals, Inc. (commodity chemicals) (2002 - 2005); Former Director, R.J. Reynolds Tobacco Holdings, Inc. (tobacco) (1999 - 2005); and Former Director of Texaco, Inc. (1997 - 2001) - ---------------------------------------------------------------------------------------------------------------------------- Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 53 Independent Trustees (continued) - ------------------------------------------------------------------------ Position Held Length of Service and Name and Age with the Fund Term of Office - ------------------------------------------------------------------------ Benjamin M. Friedman (66) Trustee Trustee since 2008. Serves until a successor trustee is elected or earlier retirement or removal. - ------------------------------------------------------------------------ Margaret B.W. Graham (63) Trustee Trustee since 2004. Serves until a successor trustee is elected or earlier retirement or removal. - ------------------------------------------------------------------------ Thomas J. Perna (60) Trustee Trustee since 2006. Serves until a successor trustee is elected or earlier retirement or removal. - ------------------------------------------------------------------------ - ---------------------------------------------------------------------------------------------------------------------------- Other Directorships Held Name and Age Principal Occupation by this Trustee - ---------------------------------------------------------------------------------------------------------------------------- Benjamin M. Friedman (66) William Joseph Maier Professor of Political Economy, Harvard Trustee, Mellon Institutional University (1972 - present) Funds Investment Trust and Mellon Institutional Funds Master Portfolio (oversaw 17 portfolios in fund complex) (1989 - 2008) - ---------------------------------------------------------------------------------------------------------------------------- Margaret B.W. Graham (63) Founding Director, Vice President and Corporate Secretary, None The Winthrop Group, Inc. (consulting firm) (1982 - present); Desautels Faculty of Management, McGill University (1999 - present); and Manager of Research Operations and Organiza- tional Learning, Xerox PARC, Xerox's Advance Research Center (1990 - 1994) - ---------------------------------------------------------------------------------------------------------------------------- Thomas J. Perna (60) Chairman and Chief Executive Officer, Quadriserv, Inc. Director, Broadridge (technology products for securities lending industry) (2008 - Financial Solutions, Inc. present); private investor (2004 - 2008); and Senior (investor communications Executive Vice President, The Bank of New York (financial and and securities processing securities services) (1986 - 2004) provider for financial services industry) (2009 - present); and Director, Quadriserv, Inc. (2005 - present) - ---------------------------------------------------------------------------------------------------------------------------- 54 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 - ------------------------------------------------------------------------ Position Held Length of Service and Name and Age with the Fund Term of Office - ------------------------------------------------------------------------ Marguerite A. Piret (62) Trustee Trustee since 2004. Serves until a successor trustee is elected or earlier retirement or removal. - ------------------------------------------------------------------------ Stephen K. West (82) Trustee Trustee since 2008. Serves until a successor trustee is elected or earlier retirement or removal. - ------------------------------------------------------------------------ - --------------------------------------------------------------------------------------------------------------------- Other Directorships Held Name and Age Principal Occupation by this Trustee - --------------------------------------------------------------------------------------------------------------------- Marguerite A. Piret (62) President and Chief Executive Officer, Newbury, Piret & Director of New America Company, Inc. (investment banking firm) (1981 - present) High Income Fund, Inc. (closed-end investment company) (2004 - present); and member, Board of Governors, Investment Company Institute (2000 - 2006) - --------------------------------------------------------------------------------------------------------------------- Stephen K. West (82) Senior Counsel, Sullivan & Cromwell LLP (law firm) Director, The Swiss Helvetia (1998 - present); and Partner, Sullivan & Cromwell LLP Fund, Inc. (closed-end (prior to 1998) investment company); and Director, AMVESCAP, PLC (investment manager) (1997 - 2005) - --------------------------------------------------------------------------------------------------------------------- Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 55 Fund Officers - -------------------------------------------------------------------------------- Position Held Length of Service and Name and Age with the Fund Term of Office - -------------------------------------------------------------------------------- Christopher J. Kelley (46) Secretary Since 2010. Serves at the discretion of the Board. - -------------------------------------------------------------------------------- Carol B. Hannigan (49) Assistant Secretary Since 2010. Serves at the discretion of the Board. - -------------------------------------------------------------------------------- Thomas Reyes (48) Assistant Secretary Since 2010. Serves at the discretion of the Board. - -------------------------------------------------------------------------------- Mark E. Bradley (51) Treasurer Since 2008. Serves at the discretion of the Board. - -------------------------------------------------------------------------------- Luis I. Presutti (45) Assistant Treasurer Since 2004. Serves at the discretion of the Board. - -------------------------------------------------------------------------------- - ----------------------------------------------------------------------------------------------------------------------------- Other Directorships Held Name and Age Principal Occupation by this Officer - ----------------------------------------------------------------------------------------------------------------------------- Christopher J. Kelley (46) Vice President and Associate General Counsel of Pioneer None since January 2008 and Secretary of all of the Pioneer Funds since June 2010; Assistant Secretary of all of the Pioneer Funds from September 2003 to May 2010; and Vice President and Senior Counsel of Pioneer from July 2002 to December 2007 - ----------------------------------------------------------------------------------------------------------------------------- Carol B. Hannigan (49) Fund Governance Director of Pioneer since December 2006 None and Assistant Secretary of all the Pioneer Funds since June 2010; Manager - Fund Governance of Pioneer from December 2003 to November 2006; and Senior Paralegal of Pioneer from January 2000 to November 2003 - ----------------------------------------------------------------------------------------------------------------------------- Thomas Reyes (48) Counsel of Pioneer since June 2007 and Assistant Secretary None of all the Pioneer Funds since June 2010; and Vice President and Counsel at State Street Bank from October 2004 to June 2007 - ----------------------------------------------------------------------------------------------------------------------------- Mark E. Bradley (51) Vice President - Fund Accounting, Administration and None Controllership Services of Pioneer; Treasurer of all of the Pioneer Funds since March 2008; Deputy Treasurer of Pioneer from March 2004 to February 2008; Assistant Treasurer of all of the Pioneer Funds from March 2004 to February 2008; and Treasurer and Senior Vice President, CDC IXIS Asset Management Services, from 2002 to 2003 - ----------------------------------------------------------------------------------------------------------------------------- Luis I. Presutti (45) Assistant Vice President - Fund Accounting, Administration None and Controllership Services of Pioneer; and Assistant Treasurer of all of the Pioneer Funds - ----------------------------------------------------------------------------------------------------------------------------- 56 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 - ---------------------------------------------------------------------------- Position Held Length of Service and Name and Age with the Fund Term of Office - ---------------------------------------------------------------------------- Gary Sullivan (52) Assistant Treasurer Since 2004. Serves at the discretion of the Board. - ---------------------------------------------------------------------------- David F. Johnson (31) Assistant Treasurer Since 2009. Serves at the discretion of the Board. - ---------------------------------------------------------------------------- Jean M. Bradley (58) Chief Compliance Officer Since 2010. Serves at the discretion of the Board. - ---------------------------------------------------------------------------- - ------------------------------------------------------------------------------------------------------------------ Other Directorships Held Name and Age Principal Occupation by this Officer - ------------------------------------------------------------------------------------------------------------------ Gary Sullivan (52) Fund Accounting Manager - Fund Accounting, Administration None and Controllership Services of Pioneer; and Assistant Treasurer of all of the Pioneer Funds - ------------------------------------------------------------------------------------------------------------------ David F. Johnson (31) Fund Administration Manager - Fund Accounting, Administration None and Controllership Services since November 2008; Assistant Treasurer of all of the Pioneer Funds since January 2009; and Client Service Manager - Institutional Investor Services at State Street Bank from March 2003 to March 2007 - ------------------------------------------------------------------------------------------------------------------ Jean M. Bradley (58) Chief Compliance Officer of Pioneer and of all the Pioneer None Funds since March 2010; Director of Adviser and Portfolio Compliance at Pioneer since October 2005; and Senior Compliance Officer for Columbia Management Advisers, Inc. from October 2003 to October 2005 - ------------------------------------------------------------------------------------------------------------------ Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 57 This page for your notes. 58 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 This page for your notes. Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 59 This page for your notes. 60 Pioneer Growth Opportunities Fund | Annual Report | 12/31/10 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 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@pioneerinvestments.com (for general questions about Pioneer only) Visit our web site: pioneerinvestments.com This report must be preceded or accompanied by a prospectus. The Fund files a complete schedule 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. Pioneer Tax Free Money Market Fund - -------------------------------------------------------------------------------- Annual Report | December 31, 2010 - -------------------------------------------------------------------------------- Ticker Symbols: Class A TTAXX [LOGO] PIONEER Investments(R) visit us: pioneerinvestments.com Table of Contents Letter to Shareowners 2 Portfolio Management Discussion 4 Portfolio Summary 7 Performance Update 8 Comparing Ongoing Fund Expenses 9 Schedule of Investments 11 Financial Statements 15 Notes to Financial Statements 20 Report of Independent Registered Public Accounting Firm 24 Approval of Investment Advisory Agreement 26 Trustees, Officers and Service Providers 30 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 1 President's Letter Dear Shareowner, Throughout 2010, the U.S. economy moved forward on a slow path to recovery. But with the memory of a deep recession still lingering, businesses and consumers remained cautious about both investing and spending. While business fundamentals showed signs of improvement, there was still a reluctance to hire, and high unemployment remains a problem. Wary investors, concerned about risk, gravitated towards cash and bonds, until a rally late in the year lifted equity returns. We remain generally optimistic about the prospects for economic recovery, although it may occur more slowly than many would like. At Pioneer, we have long advocated the benefits of staying diversified and investing for the long term. This strategy has generally performed well for many investors. Bond markets certainly rewarded investors in the first eleven months of 2010. While the equity markets barely budged for those first eleven months, valuations were inexpensive relative to bonds, compared with historic levels, and represented potentially good value for long-term investors, many of whom were rewarded in the subsequent late-year equity rally. Pioneer has not changed the basic approach to investing that we have used for more than 80 years. We remain focused on company fundamentals and risk management. Our investment process is based on careful research into individual companies, quantitative analysis, and active portfolio management. This three-pillared process, which we apply to each of our portfolios, is supported by an integrated team approach and is designed to carefully balance risk and reward. Our experienced professionals devote themselves to the careful research needed to identify investment opportunities in markets around the world. Our advice, as always, is to work closely with a trusted financial advisor to discuss your goals and work together to develop an investment strategy that meets your individual needs. There is no single best strategy that works for every investor. 2 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 We invite you to learn more about Pioneer and our time-tested approach to investing by consulting with your financial advisor or visiting us online at www.pioneerinvestments.com. We greatly appreciate your trust in us and we thank you for investing with Pioneer. Sincerely, /s/ Daniel K. Kingsbury Daniel K. Kingsbury President and CEO Pioneer Investment Management USA, 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. Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 3 Portfolio Management Discussion | 12/31/10 In the following interview, Pioneer Tax Free Money Market Fund Portfolio Manager Seth Roman outlines the investment environment for tax-free money market securities during the Fund's most recent fiscal year ended December 31, 2010, as well as the Fund's performance, his investment strategy, and his outlook going forward. Mr. Roman is a member of Pioneer's Fixed Income Group, which is responsible for the daily management of the Fund. Q How did the Fund perform during its most recent fiscal year ended December 31, 2010? A For the 12-month period ended December 31, 2010, the Fund's Class A shares posted a 0.01% total return at net asset value. Over the same period, the average return of the 94 mutual funds in Lipper's Tax-Exempt Money Market Funds category was 0.03%. Q How would you describe the investing environment for tax-exempt money market funds during the 12 months ended December 31, 2010? A In 2010, the U.S. economy took some additional steps toward normalcy, but unemployment remained uncomfortably high. Concerned about U.S. unemployment, and also anxious to ward off any possibility of a deflationary spiral, the Federal Reserve Board (the Fed) kept its benchmark federal funds rate at a target range between 0.00% and 0.25%.With stimulus from the executive and congressional branches of the government having run its course, the Fed decided to engage in a second round of quantitative easing, known as "QE2," announcing its intention to purchase $600 billion in Treasury securities through June 2011. The purpose of QE2 is to provide a boost to economic growth through monetary stimulus, and to put a "floor" under asset prices. During the 12-month period, state and local governments' budget woes increased. Unlike the Federal government, states and municipalities must balance their budgets annually; the obligation has become much more difficult for states and municipalities to fulfill after a sustained period of reduced tax revenue across much of the country. States such as California, Illinois, New York and New Jersey -- along with many others -- face serious fiscal stress. Internationally, budget woes for Greece and Ireland negatively affected the global bond market, and the European Central Bank worked to prevent the fiscal crisis from spreading to other European countries, especially Spain, Portugal and Italy. During the fourth quarter, concern over the possible inflationary effects of the Fed's QE2 program prompted a sell-off in the long-term Treasury market, causing the Treasury yield curve to steepen. 4 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 The short-term municipal yield curve remained fairly flat, however, meaning that there was very little difference in yield between tax-exempt securities maturing in one day versus those maturing in one year. Q In that environment, what was your investment strategy for the Fund during the 12-month period ended December 31, 2010? A Our goal is always to maintain broad diversification within the Fund's portfolio, both on a regional and national basis, with AAA credits in revenue issues. As we pursue our nationally-focused diversification strategy, we strongly emphasize high-quality and safety of principal in the securities owned by the Fund. In a difficult period for the tax-exempt money markets, we took an extremely cautious approach in managing the Fund's assets. In particular, we avoided issues tied to state governments with economic troubles. During the 12 months ended December 31, 2010, the Fund invested principally in high-quality daily and weekly floating-rate securities. The floating-rate issues are extremely liquid, with yields that adjust daily or weekly based on market conditions, thus providing the management team with strategic flexibility and the Fund with some measure of yield. From time to time, we took advantage of opportunities to add longer-term issues to the Fund's portfolio -- though only those of the highest quality -- in an attempt to pick up additional yield. Within the floating-rate market, we have favored issues with dedicated revenue streams, such as water and sewer debt securities. Q What is your outlook? A We are cautiously optimistic that the U.S. economy will continue to improve in 2011, that banks will lend more, and that municipalities will see some increases in tax receipts, which would improve their fiscal outlook. Nevertheless, we expect that tax-exempt issuers will continue to face hard times in dealing with budget problems and unfunded liabilities, such as pension obligations, and it seems unlikely to us that many municipalities will be able to raise money in the short-term municipal market when they are already overburdened by debt. In addition, we think that the Fed's monetary policy will continue to be accommodative, as Fed officials appear generally much more worried about deflation and high unemployment than about inflation. We will continue to look for opportunities to extend the Fund's maturity, though with extreme caution, and will carefully examine credit quality due to the severe budgetary strains nationwide. In addition, we will monitor market movements strictly, and seek to take advantage of any upward trends in short-term yields, while maintaining the highest-quality portfolio. Note to Shareholders: On January 11, 2011, The Board of Trustees authorized the liquidation of the Fund. The liquidation is expected to occur on or about March 25, 2011. Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 5 Please refer to the Schedule of Investments on pages 11-14 for a full listing of Fund securities. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund. Fund shares are not federally insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency. When interest rates rise, the prices of fixed income securities in the Fund will generally fall. Conversely, when interest rates fall, the prices of fixed income securities in the Fund will generally rise. Investments in the Fund are subject to possible loss due to the financial failure of issuers of underlying securities and their inability to meet their debt obligations. Investing in foreign and/or emerging markets securities involves risks relating to interest rates, currency exchange rates, economic, and political conditions. At times, the Fund's investments may represent industries or industry sectors that are interrelated or have common risks, making it more susceptible to any economic, political, or regulatory developments or other risks affecting those industries and sectors. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. 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. 6 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 Portfolio Summary | 12/31/10 Sector Distribution - -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [The following data was represented as a pie chart in the printed material] Higher Education 33.3% Medical 20.8% Water 9.2% Education 6.6% Development 6.2% General 4.6% Pollution Control 4.6% Airport 4.4% Diversified 4.2% Government 2.8% School District 2.4% Utilities 0.9% 10 Largest Holdings - -------------------------------------------------------------------------------- (As a percentage of debt holdings)* 1. Texas Water Development Board, Floating Rate Note, 7/15/19 4.76% 2. Lincoln County Wyoming Pollutant Control, Floating Rate Note, 11/1/14 4.55 3. Metropolitan Washington Airport, Floating Rate Note, 10/1/39 4.39 4. Maryland State Health & Higher Educational Facilities Authority Revenue, Floating Rate Note, 7/1/36 4.35 5. Massachusetts Health & Educational, Floating Rate Note, 7/1/35 4.33 6. Massachusetts State Health & Educational, Floating Rate Note, 11/1/49 4.31 7. Boston Massachusetts Water & Sewer Communities Revenue, Floating Rate Note, 11/1/24 3.93 8. Virginia College Building Authority, Floating Rate Note, 2/1/26 3.73 9. Connecticut State Health, Floating Rate Note, 7/1/36 3.52 10. Syracuse Industrial, 0.15%, 12/1/35 3.30 * This list excludes temporary cash investments. Portfolio holdings will vary for other periods. The holdings listed should not be considered recommendations to buy or sell any securities listed. Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 7 Performance Update | 12/31/10 Share Prices - -------------------------------------------------------------------------------- - ------------------------------------------------------------------ Net Asset Value per Share 12/31/10 12/31/09 - ------------------------------------------------------------------ Class A shares $ 1.00 $ 1.00 Distributions per Share - -------------------------------------------------------------------------------- - ------------------------------------------------------------------ Income Short-Term Long-Term (1/1/10-12/31/10) Dividends Capital Gains Capital Gains - ------------------------------------------------------------------ Class A shares $ 0.0001 $ - $ - Yields** - -------------------------------------------------------------------------------- - ------------------------------------------------------------------ Per Share 7-Day Annualized 7-Day Effective* - ------------------------------------------------------------------ Class A shares 0.01% 0.01% Expense Ratio - -------------------------------------------------------------------------------- - ------------------------------------------------------------------ (Per Prospectus dated May 1, 2010) Gross Net - ------------------------------------------------------------------ Class A shares 0.75% 0.75% * Assumes daily compounding of dividends. ** Please contact Pioneer to obtain the Fund's current yield. Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. Performance data shown represents past performance. Past performance does not guarantee future results. Investment returns will fluctuate, and there can be no guarantee the Fund will be able to maintain a stable net asset value of $1.00 per share. An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund. Pioneer Tax Free Money Market Fund was created through the reorganization of the predecessor fund, Safeco Tax Free Money Market Fund, on December 10, 2004. Performance does not reflect the deduction of taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. 8 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 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 [divided by] $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 Tax Free Money Market Fund Based on actual returns from July 1, 2010, through December 31, 2010. - -------------------------------------------------- Share Class A - -------------------------------------------------- Beginning Account $ 1,000.00 Value on 7/1/10 - -------------------------------------------------- Ending Account $ 1,000.10 Value on 12/31/10 - -------------------------------------------------- Expenses Paid $ 1.66 During Period* - -------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 0.33%, for Class A shares, multiplied by the average account value over the period, multiplied by 184/365 (to reflect the one-half year period). Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 9 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 Tax Free Money Market Fund Based on a hypothetical 5% per year return before expenses, reflecting the period from July 1, 2010, through December 31, 2010. - -------------------------------------------------- Share Class A - -------------------------------------------------- Beginning Account $ 1,000.00 Value on 7/1/10 - -------------------------------------------------- Ending Account $ 1,023.54 Value on 12/31/10 - -------------------------------------------------- Expenses Paid $ 1.68 During Period* - -------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 0.33%, for Class A shares, multiplied by the average account value over the period, multiplied by 184/365 (to reflect the one-half year period). 10 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 Schedule of Investments | 12/31/10 - ------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------- MUNICIPAL BONDS -- 91.6% Government -- 3.1% $ 1,485,000 0.30 AA+/NR Washington State Putters-Series, Floating Rate Note, 7/1/13 $ 1,485,000 - ------------------------------------------------------------------------------------------------------- Municipal Airport -- 4.4% 2,120,000 0.28 AAA/Aa1 Metropolitan Washington Airport, Floating Rate Note, 10/1/39 $ 2,120,000 - ------------------------------------------------------------------------------------------------------- Municipal Development -- 6.2% 1,500,000 AA/Aa1 Mississippi Business, 0.16%, 12/1/30 $ 1,500,000 900,000 0.27 AA/Aa1 Mississippi Business Finance Corp., Gulf Opportunity Zone, Floating Rate Note, 12/1/30 900,000 600,000 0.40 AA-/A2 Mobile Industrial Development, Floating Rate Note, 4/1/15 600,000 ----------- $ 3,000,000 - ------------------------------------------------------------------------------------------------------- Municipal Education -- 2.5% 800,000 0.49 AA-/NA Illinois Financial Authority Revenue, Floating Rate Note, 9/1/41 $ 800,000 430,000 0.29 AAA/Aaa New Hampshire Health & Education, Floating Rate Note, 1/1/28 430,000 ----------- $ 1,230,000 - ------------------------------------------------------------------------------------------------------- Municipal General -- 2.5% 1,225,000 0.29 NR/Aa2 Colorado Educational & Cultural Facilities Authority, 0.4%, 3/1/39 $ 1,225,000 - ------------------------------------------------------------------------------------------------------- Municipal Higher Education -- 33.2% 210,000 NR/Aa2 Charlottesville Virginia Industrial Development, Floating Rate Note, 12/1/37 $ 210,000 240,000 0.23 AAA/Aaa Connecticut State Health & Educational, Floating Rate Note, 7/1/33 240,000 1,700,000 0.24 AAA/Aaa Connecticut State Health, Floating Rate Note, 7/1/36 1,700,000 1,200,000 0.30 AAA/Aa1 District Of Columbia, Floating Rate Note, 4/1/41 1,200,000 500,000 0.30 AAA/Aa1 District of Columbia University Revenue, Floating Rate Note, 4/1/41 500,000 495,000 0.27 AA/NR Kent County Delaware Student, Floating Rate Note, 7/1/36 495,000 2,100,000 0.29 AA/Aa2 Maryland State Health & Higher Educational Facilities Authority Revenue, Floating Rate Note, 7/1/36 2,100,000 1,510,000 0.24 AA+/Aaa Massachusetts Health & Educational, Floating Rate Note, 7/1/39 1,510,000 2,080,000 0.24 AAA/Aaa Massachusetts State Health & Educational, Floating Rate Note, 11/1/49 2,080,000 200,000 0.26 AAA/Aaa Missouri State Health & Educational Facility, Floating Rate Note, 3/1/40 200,000 The accompanying notes are an integral part of these financial statements. Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 11 Schedule of Investments | 12/31/10 (continued) - -------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount (unaudited) (unaudited) Value - -------------------------------------------------------------------------------------------------------- Municipal Higher Education -- continued $ 1,595,000 AAA/Aa1 Syracuse Industrial, 0.15%, 12/1/35 $ 1,595,000 700,000 0.25 AAA/Aa1 Syracuse New York Industrial Development Agency, Floating Rate Note, 12/1/37 700,000 720,000 0.34 AA/Aa2 University of Minnesota, Floating Rate Note, 12/1/36 720,000 1,800,000 0.28 AA+/Aa1 Virginia College Building Authority, Floating Rate Note, 2/1/26 1,800,000 615,000 0.35 NR/Aa1 Virginia College Building Authority, Floating Rate Note, 2/26/39 615,000 460,000 0.28 AAA/Aa1 Wisconsin State Health & Educational Facilities, Floating Rate Note, 12/1/33 460,000 ----------- $16,125,000 - -------------------------------------------------------------------------------------------------------- Municipal Medical -- 20.8% 1,000,000 0.28 AA/Aaa Harris County Texas Health, Floating Rate Note, 12/1/41 $ 1,000,000 500,000 0.26 AAA/Aaa Loudoun County Virginia Industrial Development Authority, Floating Rate Note, 2/15/38 500,000 1,120,000 0.29 AAA/Aaa Loudoun County Virginia Industrial Development Authority, Floating Rate Note, 2/15/38 1,120,000 2,090,000 0.27 AA/Aa2 Massachusetts Health & Educational, Floating Rate Note, 7/1/35 2,090,000 50,000 0.33 AA/Aa1 Minneapolis & St Paul, Floating Rate Note, 11/15/34 50,000 950,000 NR/Aa1 Minneapolis & St. Paul Housing & Redevelopment Authority, 0.2%, 11/15/35 950,000 1,050,000 NR/Aa1 Minneapolis & St. Paul Housing & Redevelopment Authority, 0.2%, 11/15/35 1,050,000 1,540,000 0.27 NR/Aa2 North Carolina Medical Care Communities, Floating Rate Note, 6/1/15 1,540,000 700,000 0.29 NR/Aa1 Nueces County Texas Health Facilities Development Corp. Revenue, Floating Rate Note, 7/1/15 700,000 500,000 0.28 AA-/NR Oregon State Facilities Authority Revenue, Floating Rate Note, 8/1/34 500,000 580,000 0.28 AA+/Aa2 University of Michigan, Floating Rate Note, 12/1/37 580,000 ----------- $10,080,000 - -------------------------------------------------------------------------------------------------------- Municipal Pollution -- 4.5% 2,200,000 0.23 AAA/Aaa Lincoln County Wyoming Pollutant Control, Floating Rate Note, 11/1/14 $ 2,200,000 - -------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 12 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 - -------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount (unaudited) (unaudited) Value - -------------------------------------------------------------------------------------------------------- Municipal School District -- 4.4% $ 1,140,000 0.28 AAA/Aa1 Chicago Board of Education, Floating Rate Note, 3/1/31 $ 1,140,000 1,000,000 NR/NR Town of Weston Massachusetts, 1.5%, 2/4/11 1,001,134 ----------- $ 2,141,134 - -------------------------------------------------------------------------------------------------------- Municipal Utilities -- 0.9% 430,000 0.33 AA/Aa2 Gainsville Florida Utilities, Floating Rate Note, 10/1/38 $ 430,000 - -------------------------------------------------------------------------------------------------------- Municipal Water -- 9.1% 1,900,000 0.39 AA-/Aa2 Boston Massachusetts Water & Sewer Communities Revenue, Floating Rate Note, 11/1/24 $ 1,900,000 200,000 0.38 AAA/Aa1 Columbia South Carolina Water, Floating Rate Note, 2/1/38 200,000 2,300,000 0.29 AAA/Aaa Texas Water Development Board, Floating Rate Note, 7/15/19 2,300,000 ----------- $ 4,400,000 ----------- Total Government $44,436,134 - -------------------------------------------------------------------------------------------------------- TOTAL MUNICIPAL BONDS (Cost $44,436,134) $44,436,134 - -------------------------------------------------------------------------------------------------------- TEMPORARY CASH INVESTMENTS -- 8.2% Commercial Paper -- 8.0% 250,000 A-1+/P-1 Johns Hopkins University, 0.29%, 2/4/11 $ 250,000 240,000 A-1+/P-1 Massachusetts Health & Educational Facilities Authority, 0.25%, 2/4/11 240,000 280,000 NR/NR Massachusetts Health & Educational Facilities Authority, 0.25%, 1/6/11 280,000 260,000 A-1+/P-1 Texas A&M University, 0.28%, 1/3/11 260,000 200,000 NR/NR University of Minnesota, 0.25%, 1/6/11 200,000 386,000 A-1+/P-1 University of Texas, 0.24%, 1/6/11 386,000 340,000 A-1+/P-1 University of Texas, 0.25%, 2/3/11 340,000 100,000 A-1+/NR Private Colleges & Universities, 0.3%, 2/1/11 100,000 1,490,000 A-1+/P-1 Texas Public Finance Authority, 0.27%, 2/1/11 1,490,000 325,000 A-1+/P-1 Texas Public Finance Authority, 0.28%, 3/4/11 325,000 - -------------------------------------------------------------------------------------------------------- TOTAL COMMERCIAL PAPER $ 3,871,000 ----------- (Cost $3,871,000) $ 3,871,000 - -------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 13 Schedule of Investments | 12/31/10 (continued) - ------------------------------------------------------------------------------------------- Floating S&P/Moody's Rate (b) Ratings Shares (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------- TAX EXEMPT MONEY MARKET MUTUAL FUND -- 0.2% 100,000 BlackRock Liquidity Funds Temp Cash Portfolio $ 100,000 - ------------------------------------------------------------------------------------------- TOTAL TAX EXEMPT MONEY MARKET MUTUAL FUND $ 100,000 - ------------------------------------------------------------------------------------------- TOTAL TEMPORARY CASH INVESTMENTS (Cost $3,971,000) $ 3,971,000 - ------------------------------------------------------------------------------------------- TOTAL INVESTMENT IN SECURITIES -- 99.8% (Cost $48,407,134) (a) $48,407,134 - ------------------------------------------------------------------------------------------- OTHER ASSETS AND LIABILITIES -- 0.2% $ 107,869 - ------------------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $48,515,003 =========================================================================================== NR Not Rated by either S&P or Moody's (a) At December 31, 2010, cost for federal income tax purposes was $48,407,134. (b) Debt obligation with a variable interest rate. Rate shown is rate at period end. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. Highest priority is given to Level 1 inputs and lowest priority is given to Level 3. Level 1 -- quoted prices in active markets for identical securities Level 2 -- other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.) Level 3 -- significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) The following is a summary of the inputs used as of December 31, 2010, in valuing the Fund's assets: - ------------------------------------------------------------------------------------ Level 1 Level 2 Level 3 Total - ------------------------------------------------------------------------------------ Municipal bonds $ -- $44,436,134 $-- $44,436,134 Commercial paper -- 3,871,000 -- 3,871,000 Tax exempt money market mutual fund 100,000 -- -- 100,000 - ------------------------------------------------------------------------------------ Total $100,000 $48,307,134 $-- $48,407,134 ==================================================================================== The accompanying notes are an integral part of these financial statements. 14 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 Statement of Assets and Liabilities | 12/31/10 ASSETS: Investment in securities (cost $48,407,134) $48,407,134 Cash 89,823 Receivables -- Fund shares sold 1,372 Dividends, interest 48,549 Due from Pioneer Investment Management, Inc. 30,787 Other 14,154 - --------------------------------------------------------------------- Total assets $48,591,819 - --------------------------------------------------------------------- LIABILITIES: Due to affiliates $ 7,315 Auditing fees 29,625 Printing fees 7,220 Insurance fees 10,494 Legal fees 5,100 Accrued expenses 17,062 - --------------------------------------------------------------------- Total liabilities $ 76,816 - --------------------------------------------------------------------- NET ASSETS: Paid-in capital $48,524,726 Accumulated net realized loss on investments (9,723) - --------------------------------------------------------------------- Total net assets $48,515,003 ===================================================================== NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Class A (based on $48,515,003/48,467,111 shares) $ 1.00 ===================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 15 Statement of Operations For the Year Ended 12/31/10 INVESTMENT INCOME: Interest $154,862 - ------------------------------------------------------------------------------------- Total investment income $ 154,862 - ------------------------------------------------------------------------------------- EXPENSES: Management fees $211,404 Transfer agent fees and expenses Class A 11,533 Distribution fees Class A 67,417 Shareholder communications expense 5,309 Administrative reimbursements 16,698 Registration fees 63,762 Professional fees 70,173 Printing expense 23,243 Fees and expenses of nonaffiliated trustees 10,178 Miscellaneous 3,400 - ------------------------------------------------------------------------------------- Total expenses $ 483,117 Less fees waived and expenses reimbursed by Pioneer Investment Management, Inc. (347,154) - ------------------------------------------------------------------------------------- Net expenses $ 135,963 - ------------------------------------------------------------------------------------- Net investment income $ 18,899 - ------------------------------------------------------------------------------------- REALIZED GAIN ON INVESTMENTS Net realized gain on investments $ 12,029 - ------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 30,928 ===================================================================================== The accompanying notes are an integral part of these financial statements. 16 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 Statements of Changes in Net Assets For the Years Ended 12/31/10 and 12/31/09, respectively - ---------------------------------------------------------------------------------------------- Year Ended Year Ended 12/31/10 12/31/09 - ---------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income $ 18,899 $ 41,347 Net realized gain on investments 12,029 5,212 - ---------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 30,928 $ 46,559 - ---------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Net investment income: Class A ($0.0001 and $0.0001 per share, respectively) $ (4,487) $ (7,169) Class Y* ($0.0001 and $0.0002 per share, respectively) (742) (17,763) - ---------------------------------------------------------------------------------------------- Total distributions to shareowners $ (5,229) $ (24,932) - ---------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sale of shares $ 70,020,886 $157,719,458 Reinvestment of distributions 4,487 7,171 Cost of shares repurchased (109,909,748) (243,527,086) - ---------------------------------------------------------------------------------------------- Net decrease in net assets resulting from Fund share transactions $(39,884,375) $(85,800,457) - ---------------------------------------------------------------------------------------------- Net decrease in net assets $(39,858,676) $(85,778,830) NET ASSETS: Beginning of year 88,373,679 174,152,509 - ---------------------------------------------------------------------------------------------- End of year $ 48,515,003 $ 88,373,679 - ---------------------------------------------------------------------------------------------- Distributions in excess of net investment income $ -- $ (13,670) - ---------------------------------------------------------------------------------------------- * Class Y shares were liquidated on March 24, 2010. The accompanying notes are an integral part of these financial statements. Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 17 Statements of Changes in Net Assets (continued) - ------------------------------------------------------------------------------------------------------ '10 Shares '10 Amount '09 Shares '09 Amount - ------------------------------------------------------------------------------------------------------ Class A Shares sold 61,699,869 $ 61,720,693 90,223,403 $ 90,223,402 Reinvestment of distributions 4,487 4,487 7,169 7,169 Less shares repurchased (57,376,025) (57,376,025) (116,430,862) (116,430,862) - ------------------------------------------------------------------------------------------------------ Net increase (decrease) 4,328,331 $ 4,349,155 (26,200,290) $(26,200,291) ====================================================================================================== Class Y* Shares sold 8,300,193 $ 8,300,193 67,496,056 $ 67,496,056 Reinvestment of distributions -- -- 2 2 Less shares repurchased (52,533,723) (52,533,723) (127,096,224) (127,096,224) - ------------------------------------------------------------------------------------------------------ Net decrease (44,233,530) $(44,233,530) (59,600,166) $(59,600,166) ====================================================================================================== * Class Y shares were liquidated on March 24, 2010. The accompanying notes are an integral part of these financial statements. 18 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 Financial Highlights - --------------------------------------------------------------------------------------------------- Year Ended Year Ended 12/31/10 12/31/09 - --------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of period $ 1.0000 $ 1.0000 - --------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income $ 0.0003 $ 0.0001 Net realized and unrealized loss on investments (0.0002) -- - --------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations: $ 0.0001 $ 0.0001 Distributions to shareowners: Net investment income (0.0001) (0.0001) Net realized and unrealized gain on investments -- - --------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value: 0.0000 -- - --------------------------------------------------------------------------------------------------- Net asset value, end of period $ 1.0000 $ 1.0000 =================================================================================================== Total return* 0.01% 0.01% Ratio of net expenses to average net assets+ 0.33% 0.41% Ratio of net investment income to average net assets+ 0.02% 0.02% Net assets, end of period (in thousands) $ 48,515 $ 44,138 Ratios with no waiver of management fees and assumptions of expense by the Adviser and no reductions for fees paid indirectly: Net expenses 1.00% 0.80% Net investment income (loss) (0.65)% (0.37)% Ratios with waiver of management fees and assumptions of expense by the Adviser and no reductions for fees paid indirectly: Net expenses 0.33% 0.41% Net investment income 0.02% 0.02% =================================================================================================== - ------------------------------------------------------------------------------------------------------------ Year Ended Year Ended Year Ended 12/31/08 12/31/07 12/31/06 - ------------------------------------------------------------------------------------------------------------ Class A Net asset value, beginning of period $ 1.0000 $ 1.0000 $ 1.0000 - ------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.0157 $(0.0299) $ 0.0270 Net realized and unrealized loss on investments -- -- -- - ------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations: $ 0.0157 $(0.0299) $ 0.0270 Distributions to shareowners: Net investment income (0.0157) 0.0299 (0.0270) Net realized and unrealized gain on investments -- 0.0003 -- - ------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value: -- 0.0003 -- - ------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 1.0000 $ 1.0003 $ 1.0000 ============================================================================================================ Total return* 1.58% 3.03% 2.76% Ratio of net expenses to average net assets+ 0.72% 0.65% 0.75% Ratio of net investment income to average net assets+ 1.56% 2.96% 2.82% Net assets, end of period (in thousands) $ 70,331 $ 71,568 $ 72,854 Ratios with no waiver of management fees and assumptions of expense by the Adviser and no reductions for fees paid indirectly: Net expenses 0.72% 0.65% 0.75% Net investment income (loss) 1.56% 2.96% 2.82% Ratios with waiver of management fees and assumptions of expense by the Adviser and no reductions for fees paid indirectly: Net expenses 0.72% 0.64% 0.75% Net investment income 1.56% 2.96% 2.82% ============================================================================================================ * 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. + Ratio with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 19 Notes to Financial Statements | 12/31/10 1. Organization and Significant Accounting Policies Pioneer Tax Free Money Market Fund (the Fund) is one of three series comprising Pioneer Series Trust II, a Delaware statutory trust. The Fund is registered under the Investment Company Act of 1940 as a diversified, open-end management investment company. The investment objective of the Fund is to provide current income, exempt from federal income tax, as is consistent with the preservation of capital. The Fund offers one class of shares -- Class A shares. Class Y shares were liquidated on March 24, 2010. Each class of shares represents an interest in the same portfolio of investments of the Fund and have identical rights (based on relative net asset values) to assets and liquidation proceeds. Share classes can bear different rates of class-specific fees and expenses such as transfer agent and distribution fees. Differences in class-specific fees and expenses will result in differences in net investments income and, therefore, the payment of different dividends from net investment income earned by each class. The Amended and Restated Declaration of Trust of the Fund gives the Board the flexibility to specify either per share voting or dollar-weighted voting when submitting matters for shareholder approval. Under per share voting, each share of a class of the Fund is entitled to one vote. Under dollar-weighted voting, a shareholder's voting power is determined not by the number of shares owned, but by the dollar value of the shares on the record date. Each share class has exclusive voting rights with respect to matters affecting only that class, including with respect to the distribution plan for that class. There was no distribution plan for Class Y shares. The Fund's prospectus contains unaudited information regarding the Fund's principal risks. Please refer to that document when considering the Fund's principal risks. Investments in the Fund are subject to possible loss due to the financial failure of underlying issuers and their inability to meet their debt obligations. 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 period. Actual results could differ from those estimates. 20 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 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. Securities are valued at amortized cost, which approximates fair market value. Mutual funds are valued at net asset value. Investments purchased at a discount or premium are valued by amortizing the difference between the original purchase price and maturity value of the issue over the period to maturity. Interest income, including interest on income bearing cash accounts, is recorded on the accrual basis. 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. Tax years for the prior three fiscal years remain subject to examination by tax authorities. At December 31, 2010, The fund had a net capital loss carryforward of $9,723, of which, the following amounts will expire between 2012 and 2016 if not utilized: $4,043 in 2012, $4,950 in 2014, and $730 in 2016. The tax character of distributions paid during the years ended December 31, 2010 and December 31, 2009 were as follows: - ------------------------------------------------------- 2010 2009 - ------------------------------------------------------- Distributions paid from: Tax exempt income $5,229 $24,932 - ------------------------------------------------------- Total $5,229 $24,932 ======================================================= The following shows the components of distributable earnings on a federal income tax basis at December 31, 2010: - ------------------------------------------ 2010 - ------------------------------------------ Distributable earnings: Capital loss carryforward $ (9,723) - ------------------------------------------ Total $ (9,723) ========================================== C. Fund Shares The Fund records sales and repurchases of its shares as of trade date. The Fund declares as daily dividends substantially all of its net investment income. All dividends are paid on a monthly basis. Short-term capital gain distributions, if any, may be declared with the daily dividends. Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 21 D. Class Allocations Income, common expenses and realized and unrealized gains and losses are calculated at the Fund level and allocated daily to each class of shares based on its respective percentage of adjusted net assets at the beginning of the day. Distribution fees are calculated based on the average daily net asset value attributable to Class A shares of the Fund (see Note 4). All expenses and fees paid to the transfer agent, Pioneer Investment Management Shareholder Services, Inc. (PIMSS), for its services, are allocated among the classes of shares based on the number of accounts in each class and the ratable allocation of related out-of-pocket expenses (see Note 3). Distributions to shareowners are recorded as of the ex-dividend date. 2. Management Agreement Pioneer Investment Management, Inc. (PIM), a wholly-owned indirect subsidy of UniCredit, S.p.A. (UniCredit), manages the Fund's portfolio. Management fees are calculated daily at the annual rate of 0.40% of the Fund's average daily net assets up to $1 billion and 0.35% on assets over $1 billion. For the year ended December 31, 2010, the effective management fee (excluding waivers and/or reimbursement of expenses) was equivalent to a rate of 0.40% of average daily net assets. PIM may limit the Fund's expenses or waive a portion of its management fee in an effort to maintain a net asset value of $1.00 per share. From time to time, PIM and its affiliates may limit the expenses of one or more classes for the purpose of avoiding a negative yield or increasing its yield during the period of the limitation. Expenses waived during the year ended December 31, 2010 are reflected on the Statement of Operations. These expense limitation policies are voluntary and temporary and may be revised or terminated by PIM at any time without notice. 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 as administrative reimbursements. Included in "Due to Affiliates" reflected on the Statement of Assets and Liabilities is $732 in management fees, administrative costs and certain other reimbursements payable to PIM at December 31, 2010. 3. Transfer Agent PIMSS, a wholly owned indirect subsidiary of UniCredit, provides substantially all transfer agent and shareowner services to the Fund at negotiated rates. In addition, the Fund reimburses PIMSS for out-of-pocket expenses incurred by PIMSS related to shareholder communications activities such as proxy and 22 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 statement mailings, outgoing phone calls and omnibus relationship contracts. For the year ended December 31, 2010, such out-of-pocket expenses by class of shares were as follows: - --------------------------------------- Shareholder Communications: - --------------------------------------- Class A $5,309 - --------------------------------------- Total $5,309 ======================================= Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $6,384 in transfer agent fees and out-of-pocket reimbursements payable to PIMSS at December 31, 2010. 4. Distribution Plan The Fund has adopted a Distribution plan pursuant to Rule 12b-1 of the Investment Company Act of 1940, with respect to its Class A shares. Pursuant to the Plan, the Fund pays Pioneer Funds Distributor, Inc. (PFD), 0.15% of the average daily net assets attributable to Class A shares as compensation for personal services and/or account maintenance services or distribution services with regard to Class A shares. Included in "Due to Affiliates" reflected on the Statement of Assets and Liabilities is $199 in distribution fees payable to PFD at December 31, 2010. 5. Expense Offsets 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 year ended December 31, 2010, the Fund's expenses were not reduced under such arrangements. 6. Subsequent Events In preparing these financial statements, PIM has evaluated the impact of all events and transactions for potential recognition or disclosure and has determined that there were no subsequent events requiring recognition or disclosure in the financial statements other than those disclosed below. On January 11, 2011, The Board of Trustees authorized the liquidation of the Fund. The liquidation is expected to occur on or about March 25, 2011. Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 23 Report of Independent Registered Public Accounting Firm To the Board of Trustees of Pioneer Series Trust II and Shareowners of Pioneer Tax Free Money Market Fund: - -------------------------------------------------------------------------------- We have audited the accompanying statement of assets and liabilities, including the schedule of investments, of Pioneer Tax Free Money Market Fund, one of the series comprising the Pioneer Series Trust II (the "Trust"), and the related statement of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, and the financial highlights for each of the five years in the period then ended. These financial statements and financial highlights are the responsibility of the Trust's management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. We were not engaged to perform an audit of the Trust's internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Trust's internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements and financial highlights, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our procedures included confirmation of securities owned as of December 31, 2010, by correspondence with the custodian. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the financial position of Pioneer Tax Free Money Market Fund, a series of Pioneer Series Trust II, at December 31, 2010, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended, and financial highlights for each of the five years in the period then ended, in conformity with U.S. generally accepted accounting principles. /s/ Ernst & Young Boston, Massachusetts February 25, 2011 24 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 ADDITIONAL INFORMATION (unaudited) The percentages of the Fund's ordinary income distributions that are exempt from nonresident alien (NRA) tax withholding resulting from qualified interest income and qualified short term gains were 84.66% and 0.0%, respectively. Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 25 Approval of Investment Advisory Agreement Pioneer Investment Management, Inc. (PIM) serves as the investment adviser to Pioneer Tax Free Money Market Fund (the Fund) pursuant to an investment advisory agreement between PIM and the Fund. In order for PIM to remain the investment adviser of the Fund, the Trustees of the Fund must determine annually whether to renew the investment advisory agreement for the Fund. The contract review process began in March 2010 as the Trustees of the Fund agreed on, among other things, an overall approach and timeline for the process. In July 2010, the Trustees approved the format of the contract review materials and submitted their formal request to PIM to furnish information necessary to evaluate the terms of the investment advisory agreement. The contract review materials were provided to the Trustees in September 2010. After reviewing and discussing the materials, the Trustees submitted a request for additional information to PIM, and materials were provided in response to this request. Meetings of the independent Trustees of the Fund were held in July, September, October, and November, 2010 to review and discuss the contract review materials. In addition, the Trustees took into account the information related to the Fund provided to the Trustees at each regularly scheduled meeting. At a meeting held on November 16, 2010, based on their evaluation of the information provided by PIM and third parties, the Trustees of the Fund, including the independent Trustees voting separately, unanimously approved the renewal of the investment advisory agreement for another year. In considering the renewal of the investment advisory agreement, the Trustees considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the renewal of the agreement. Nature, Extent and Quality of Services The Trustees considered the nature, extent and quality of the services that had been provided by PIM to the Fund, taking into account the investment objective and strategy of the Fund. The Trustees reviewed the terms of the investment advisory agreement. The Trustees also reviewed PIM's investment approach for the Fund, its research process and its process for trade execution. The Trustees considered the resources of PIM and the personnel of PIM who provide investment management services to the Fund. The Trustees considered the non-investment resources and personnel of PIM involved in PIM's services to the Fund, including PIM's compliance and legal resources and personnel. In addition, the Trustees considered the arrangements put in place to retain key investment and other personnel. The Trustees also considered the substantial 26 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 attention and high priority given by PIM's senior management to the Pioneer fund complex. The Trustees considered that PIM supervises and monitors the performance of the Fund's service providers and provides the Fund with personnel (including Fund officers) and other resources that are necessary for the Fund's business management and operations. The Trustees also considered that, as administrator, PIM is responsible for the administration of the Fund's business and other affairs. The Trustees considered the fees paid to PIM for the provision of administration services. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that had been provided by PIM to the Fund were satisfactory and consistent with the terms of the investment advisory agreement. Performance of the Fund The Trustees considered the performance results of the Fund over various time periods. They reviewed information comparing the Fund's performance with the performance of its peer group of funds as classified by Lipper, Inc. (Lipper), an independent provider of investment company data, and with the performance of the Fund's benchmark index. The Trustees considered that the Fund's annualized total return was in the third quintile of its Lipper category for the one year period ended June 30, 2010, and in the fourth quintile of its Lipper category for the three and five year periods ended June 30, 2010. (In all quintile rankings referred to throughout this disclosure, first quintile is most favorable to the Fund's shareowners. Thus, highest relative performance would be first quintile and lowest relative expenses would also be first quintile.) The Trustees discussed the Fund's recent underperformance with PIM and were satisfied with the information presented by PIM with respect to the Fund's performance. Management Fee and Expenses The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees of its peer group of funds as classified by Lipper and the expense ratios of a peer group of funds selected on the basis of criteria determined by the independent Trustees for this purpose using data provided by Strategic Insight Mutual Trust Research and Consulting, LLC (Strategic Insight), an independent third party. The Trustees considered that the Fund's management fee for the twelve months ended June 30, 2010 was in the fourth quintile relative to the management fees paid by other funds in its Lipper peer group for the comparable period. The Trustees also considered the breakpoint in the management fee schedule and the reduced fee rate on assets over $1 billion. The Trustees considered that the Fund's asset-weighted management fee was three basis points higher than the median management fee of the Fund's peer group and virtually the same as the Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 27 last fund in the third quintile of the Fund's peer group. The Trustees considered that the Fund's expense ratio for the twelve months ended June 30, 2010 was in the first quintile relative to its Strategic Insight peer group for the comparable period. The Trustees noted that PIM currently was waiving fees and/or reimbursing expenses of the Fund in order to maintain a positive yield. The Trustees also reviewed management fees charged by PIM to its institutional and other clients. In evaluating the fees associated with PIM's client accounts, the Trustees took into account the respective demands, resources and complexity associated with the Fund and client accounts. The Trustees noted that in some instances the fee rates for those clients were lower than the management fee for the Fund and considered that, under the investment advisory agreement with the Fund, PIM performs additional services for the Fund that it does not provide to those other clients or services that are broader in scope, including oversight of the Fund's other service providers and activities related to compliance and the extensive regulatory and tax regimes to which the Fund is subject. The Trustees concluded that the management fee payable by the Fund to PIM was reasonable in relation to the nature and quality of the services provided by PIM. The Trustees also concluded that the Fund's expense ratio was reasonable taking into account the nature and quality of services provided by PIM. Profitability The Trustees considered information provided by PIM regarding the profitability of PIM with respect to the advisory services provided by PIM to the Fund, including the methodology used by PIM in allocating certain of its costs to the management of the Fund. The Trustees also considered PIM's profit margin in connection with the overall operation of the Fund. They further reviewed the financial results realized by PIM and its affiliates from non-fund businesses. The Trustees considered PIM's profit margins with respect to the Fund in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees considered that PIM has been incurring losses due to fee waivers to address low investment income and to maintain a positive yield for investors. Economies of Scale The Trustees considered PIM's views relating to economies of scale in connection with the Pioneer Funds as fund assets grow and the extent to which any such economies of scale are shared with funds and fund shareholders. The Trustees recognize that economies of scale are difficult to identify and quantify and that, among other factors that may be relevant, are the following: fee levels, expense subsidization, investment by PIM in research and analytical capabilities and PIM's commitment and resource allocation to the Funds. The Trustees noted that profitability also may be an indicator of the availability of any 28 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 economies of scale, although profitability may vary for other reasons particularly, for example during the recent difficult periods for financial markets, as the level of services was maintained notwithstanding a significant decline in PIM's fee revenues from the Funds. Accordingly, the Trustees concluded that economies of scale, if any, were being appropriately shared with the Fund. Other Benefits The Trustees considered the other benefits to PIM from its relationship with the Fund. The Trustees considered the character and amount of fees paid by the Fund, other than under the investment advisory agreement, for services provided by PIM and its affiliates. The Trustees further considered the revenues and profitability of PIM's businesses other than the fund business. The Trustees considered the intangible benefits to PIM by virtue of its relationship with the Fund and the other Pioneer funds. The Trustees concluded that the receipt of these benefits was reasonable in the context of the overall relationship between PIM and the Fund. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including all of the independent Trustees, concluded that the investment advisory agreement between PIM and the Fund, including the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of the investment advisory agreement for the Fund. Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 29 Trustees, Officers and Service Providers Investment Adviser Pioneer Investment Management, Inc. Custodian Brown Brothers Harriman & Co. Independent Registered Public Accounting Firm Ernst & Young LLP Principal Underwriter Pioneer Funds Distributor, Inc. Legal Counsel Bingham McCutchen 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 12-month period ended June 30 is publicly available to shareowners at www.pioneerinvestments.com. This information is also available on the Securities and Exchange Commission's web site at http://www.sec.gov. Trustees and Officers The Fund's Trustees and officers are listed below, together with their principal occupations during at least the past five years. Trustees who are interested persons of the Fund within the meaning of the 1940 Act are referred to as Interested Trustees. Trustees who are not interested persons of the Fund are referred to as Independent Trustees. Each of the Trustees, except Mr. West, serves as a trustee of each of the 56 U.S. registered investment portfolios for which Pioneer serves as investment adviser (the "Pioneer Funds"). Mr. West serves as a trustee of 44 U.S. registered investment portfolios for which Pioneer serves as investment adviser. The address for all Trustees and all officers of the fund is 60 State Street, Boston, Massachusetts 02109. The Statement of Additional Information of the Fund includes additional information about the Trustees and is available, upon request, by calling 1-800-225-6292. 30 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 Interested Trustees - ----------------------------------------------------------------------------------------------------------------------------------- Position Held Length of Service Other Directorships Name and Age with the Fund and Term of Office Principal Occupation Held by this Trustee - ----------------------------------------------------------------------------------------------------------------------------------- John F. Cogan, Jr. (84)* Chairman of the Board, Trustee since 2004. Non-Executive Chairman and a None Trustee and President Serves until a successor director of Pioneer Investment trustee is elected or Management USA Inc. ("PIM-USA"); earlier retirement or Chairman and a director of removal. Pioneer; Chairman and Director of Pioneer Institutional Asset Management, Inc. (since 2006); Director of Pioneer Alternative Investment Management Limited (Dublin); President and a director of Pioneer Alternative Investment Management (Bermuda) Limited and affiliated funds; Deputy Chairman and a director of Pioneer Global Asset Management S.p.A. ("PGAM") (until April 2010); Director of PIOGLOBAL Real Estate Investment Fund (Russia) (until June 2006); Director of Nano-C, Inc. (since 2003); Director of Cole Management Inc. (since 2004); Director of Fiduciary Counseling, Inc.; President and Director of Pioneer Funds Distributor, Inc. ("PFD") (until May 2006); President of all of the Pioneer Funds; and Of Counsel, Wilmer Cutler Pickering Hale and Dorr LLP - ----------------------------------------------------------------------------------------------------------------------------------- Daniel K. Kingsbury (52)* Trustee and Executive Trustee since 2007. Director, CEO and President of None Vice President Serves until a successor PIM-USA (since February 2007); trustee is elected or Director and President of Pioneer earlier retirement or and Pioneer Institutional Asset removal. Management, Inc. (since February 2007); Executive Vice President of all of the Pioneer Funds (since March 2007); Director of PGAM (2007 - 2010); Head of New Europe Division, PGAM (2000 - 2005); and Head of New Markets Division, PGAM (2005 - 2007) - ----------------------------------------------------------------------------------------------------------------------------------- * Mr. Cogan and Mr. Kingsbury are Interested Trustees because they are officers or directors of the Fund's investment adviser and certain of its affiliates. Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 31 Independent Trustees - ----------------------------------------------------------------------------------------------------------------------------------- Position Held Length of Service Other Directorships Name and Age with the Fund and Term of Office Principal Occupation Held by this Trustee - ----------------------------------------------------------------------------------------------------------------------------------- David R. Bock (67) Trustee Trustee since 2005. Managing Partner, Federal City Director of Enterprise Serves until a successor Capital Advisors (corporate Community Investment, Inc. trustee is elected or advisory services company) (1997 (privately held affordable earlier retirement or - 2004 and 2008 - present); housing finance company) (1985 removal. Interim Chief Executive Officer, - 2010); Director of Oxford Oxford Analytica, Inc. (privately Analytica, Inc. (2008 - held research and consulting present); Director of The company) (2010); Executive Vice Swiss Helvetia Fund, Inc. President and Chief Financial (closed-end fund) (2010 - Officer, I-trax, Inc. (publicly present); and Director of New traded health care services York Mortgage Trust (publicly company) (2004 - 2007); and traded mortgage REIT) (2004 - Executive Vice President and 2009) Chief Financial Officer, Pedestal Inc. (internet-based mortgage trading company) (2000 - 2002) - ----------------------------------------------------------------------------------------------------------------------------------- Mary K. Bush (62) Trustee Trustee since 2004. Chairman, Bush International, LLC Director of Marriott Serves until a successor (international financial advisory International, Inc. (2008 - trustee is elected or firm) (1991 - present); Senior present); Director of Discover earlier retirement or Managing Director, Brock Capital Financial Services (credit removal. Group, LLC (strategic business card issuer and electronic advisors) (2010 - present); payment services) (2007 - Managing Director, Federal present); Former Director of Housing Finance Board (oversight Briggs & Stratton Co. (engine of Federal Home Loan Bank system) manufacturer) (2004 - 2009); (1989 - 1991); Vice President and Head of International Finance, Federal National Mortgage Association (1988 - 1989); U.S. Alternate Executive Director, International Monetary Fund (1984 - 1988); Executive Assistant to Deputy Secretary of the U.S. Treasury, U.S. Treasury Department (1982 - 1984); and Vice President and Team Leader in Corporate Banking, Bankers Trust Co. (1976 - 1982) - ----------------------------------------------------------------------------------------------------------------------------------- 32 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 - ----------------------------------------------------------------------------------------------------------------------------------- Position Held Length of Service Other Directorships Name and Age with the Fund and Term of Office Principal Occupation Held by this Trustee - ----------------------------------------------------------------------------------------------------------------------------------- Mary K. Bush (62) (continued) Former Director of UAL Corporation (airline holding company) (2006 - 2010); Director of ManTech International Corporation (national security, defense, and intelligence technology firm) (2006 - present); Member, Board of Governors, Investment Company Institute (2007 - present); Member, Board of Governors, Independent Directors Council (2007 - present); Former Director of Brady Corporation (2000 - 2007); Former Director of Mortgage Guaranty Insurance Corporation (1991 - 2006); Former Director of Millennium Chemicals, Inc. (commodity chemicals) (2002 - 2005); Former Director, R.J. Reynolds Tobacco Holdings, Inc. (tobacco) (1999 - 2005); and Former Director of Texaco, Inc. (1997 - 2001) - ----------------------------------------------------------------------------------------------------------------------------------- Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 33 Independent Trustees (continued) - ----------------------------------------------------------------------------------------------------------------------------------- Position Held Length of Service Other Directorships Name and Age with the Fund and Term of Office Principal Occupation Held by this Trustee - ----------------------------------------------------------------------------------------------------------------------------------- Benjamin M. Friedman (66) Trustee Trustee since 2008. William Joseph Maier Professor of Trustee, Mellon Serves until a successor Political Economy, Harvard Institutional Funds trustee is elected or University (1972 - present) Investment Trust and earlier retirement or Mellon Institutional Funds removal. Master Portfolio (oversaw 17 portfolios in fund complex) (1989 - 2008) - ----------------------------------------------------------------------------------------------------------------------------------- Margaret B.W. Graham (63) Trustee Trustee since 2004. Founding Director, Vice President None Serves until a successor and Corporate Secretary, The trustee is elected or Winthrop Group, Inc. (consulting earlier retirement or firm) (1982 - present); Desautels removal. Faculty of Management, McGill University (1999 - present); and Manager of Research Operations and Organizational Learning, Xerox PARC, Xerox's Advance Research Center (1990 - 1994) - ----------------------------------------------------------------------------------------------------------------------------------- Thomas J. Perna (60) Trustee Trustee since 2006. Chairman and Chief Executive Director, Broadridge Serves until a successor Officer, Quadriserv, Inc. Financial Solutions, Inc. trustee is elected or (technology products for (investor communications earlier retirement or securities lending industry) (2008 and securities processing removal. - present); private investor (2004 provider for financial - 2008); and Senior Executive Vice services industry) (2009 - President, The Bank of New York present); and Director, (financial and securities Quadriserv, Inc. (2005 - services) (1986 - 2004) present) - ----------------------------------------------------------------------------------------------------------------------------------- 34 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 - ----------------------------------------------------------------------------------------------------------------------------------- Position Held Length of Service Other Directorships Name and Age with the Fund and Term of Office Principal Occupation Held by this Trustee - ----------------------------------------------------------------------------------------------------------------------------------- Marguerite A. Piret (62) Trustee Trustee since 2004. President and Chief Executive Director of New America Serves until a successor Officer, Newbury, Piret & Company, High Income Fund, Inc. trustee is elected or Inc. (investment banking firm) (closed-end investment earlier retirement or (1981 - present) company) (2004 - removal. present); and member, Board of Governors, Investment Company Institute (2000 - 2006) - ----------------------------------------------------------------------------------------------------------------------------------- Stephen K. West (82) Trustee Trustee since 2008. Senior Counsel, Sullivan & Director, The Swiss Serves until a successor Cromwell LLP (law firm) (1998 - Helvetia Fund, Inc. trustee is elected or present); and Partner, Sullivan & (closed-end investment earlier retirement or Cromwell LLP (prior to 1998) company); and Director, removal. AMVESCAP, PLC (investment manager) (1997 - 2005) - ----------------------------------------------------------------------------------------------------------------------------------- Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 35 Fund Officers - ----------------------------------------------------------------------------------------------------------------------------------- Position Held Length of Service Other Directorships Name and Age with the Fund and Term of Office Principal Occupation Held by this Officer - ----------------------------------------------------------------------------------------------------------------------------------- Christopher J. Kelley (46) Secretary Since 2010. Serves at Vice President and Associate None the discretion of the General Counsel of Pioneer since Board. January 2008 and Secretary of all of the Pioneer Funds since June 2010; Assistant Secretary of all of the Pioneer Funds from September 2003 to May 2010; and Vice President and Senior Counsel of Pioneer from July 2002 to December 2007 - ----------------------------------------------------------------------------------------------------------------------------------- Carol B. Hannigan (49) Assistant Secretary Since 2010. Serves at Fund Governance Director of None the discretion of the Pioneer since December 2006 and Board. Assistant Secretary of all the Pioneer Funds since June 2010; Manager - Fund Governance of Pioneer from December 2003 to November 2006; and Senior Paralegal of Pioneer from January 2000 to November 2003 - ----------------------------------------------------------------------------------------------------------------------------------- Thomas Reyes (48) Assistant Secretary Since 2010. Serves at Counsel of Pioneer since June None the discretion of the 2007 and Assistant Secretary of Board. all the Pioneer Funds since June 2010; and Vice President and Counsel at State Street Bank from October 2004 to June 2007 - ----------------------------------------------------------------------------------------------------------------------------------- Mark E. Bradley (51) Treasurer Since 2008. Serves at Vice President - Fund Accounting, None the discretion of the Administration and Controllership Board. Services of Pioneer; Treasurer of all of the Pioneer Funds since March 2008; Deputy Treasurer of Pioneer from March 2004 to February 2008; Assistant Treasurer of all of the Pioneer Funds from March 2004 to February 2008; and Treasurer and Senior Vice President, CDC IXIS Asset Management Services, from 2002 to 2003 - ----------------------------------------------------------------------------------------------------------------------------------- Luis I. Presutti (45) Assistant Treasurer Since 2004. Serves at Assistant Vice President - Fund None the discretion of the Accounting, Administration and Board. Controllership Services of Pioneer; and Assistant Treasurer of all of the Pioneer Funds - ----------------------------------------------------------------------------------------------------------------------------------- 36 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 - ----------------------------------------------------------------------------------------------------------------------------------- Position Held Length of Service Other Directorships Name and Age with the Fund and Term of Office Principal Occupation Held by this Officer - ----------------------------------------------------------------------------------------------------------------------------------- Gary Sullivan (52) Assistant Treasurer Since 2004. Serves at Fund Accounting Manager - Fund None the discretion of the Accounting, Administration and Board. Controllership Services of Pioneer; and Assistant Treasurer of all of the Pioneer Funds - ----------------------------------------------------------------------------------------------------------------------------------- David F. Johnson (31) Assistant Treasurer Since 2009. Serves at Fund Administration Manager - None the discretion of the Fund Accounting, Administration Board. and Controllership Services since November 2008; Assistant Treasurer of all of the Pioneer Funds since January 2009; and Client Service Manager - Institutional Investor Services at State Street Bank from March 2003 to March 2007 - ----------------------------------------------------------------------------------------------------------------------------------- Jean M. Bradley (58) Chief Compliance Since 2010. Serves at Chief Compliance Officer of None Officer the discretion of the Pioneer and of all the Pioneer Board. Funds since March 2010; Director of Adviser and Portfolio Compliance at Pioneer since October 2005; and Senior Compliance Officer for Columbia Management Advisers, Inc. from October 2003 to October 2005 - ----------------------------------------------------------------------------------------------------------------------------------- Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 37 This page for your notes. 38 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 This page for your notes. Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 39 This page for your notes. 40 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 This page for your notes. Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 41 This page for your notes. 42 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 This page for your notes. Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 43 This page for your notes. 44 Pioneer Tax Free Money Market Fund | Annual Report | 12/31/10 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 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@pioneerinvestments.com (for general questions about Pioneer only) Visit our web site: pioneerinvestments.com This report must be preceded or accompanied by a prospectus. The Fund files a complete schedule 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. Audit Fees Fees for audit services provided to the Trust's seven series, including fees associated with the initial and routine filings of its Form N-1A, totaled approximately $101,158 in 2010 and $231,800 in 2009. (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. Audit-Related Fees There were no audit-related services provided to the Trust during the fiscal years ended December 31, 2010 and 2009. (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. Tax Fees Fees for tax compliance services, primarily for tax returns, totaled $24,870 in 2010 and $58,030 in 2009. (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. Other Fees There were no other services provided to the Trust during the fiscal years ended December 31, 2010 and 2009. (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. Non-Audit Services Beginning with non-audit service contracts entered into on or after May 6, 2003, the effective date of the new SEC pre- approval rules, the Trust's audit committee is required to pre-approve services to affiliates defined by SEC rules to the extent that the services are determined to have a direct impact on the operations or financial reporting of the Trust. For the years ended December 31, 2010 and 2009, there were no services provided to an affiliate that required the Trust's audit committee pre-approval. (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 aggregate non-audit fees for the Fund and affiliates, as previously defined, totaled $24,870 in 2009 and $58,030 in 2009. (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. The Fund's audit committee of the Board of Trustees has considered whether the provision of non-audit services that were rendered to the Affiliates (as defined) 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. Item 5. Audit Committee of Listed Registrants (a) If the registrant is a listed issuer as defined in Rule 10A-3 under the Exchange Act (17 CFR 240.10A-3), state whether or not the registrant has a separately-designated standing audit committee established in accordance with Section 3(a)(58)(A) of the Exchange Act (15 U.S.C. 78c(a)(58)(A)). If the registrant has such a committee, however designated, identify each committee member. If the entire board of directors is acting as the registrants audit committee as specified in Section 3(a)(58)(B) of the Exchange Act (15 U.S.C. 78c(a)(58)(B)), so state. N/A (b) If applicable, provide the disclosure required by Rule 10A-3(d) under the Exchange Act (17 CFR 240.10A-3(d)) regarding an exemption from the listing standards for audit committees. N/A Item 6. Schedule of Investments. File Schedule I Investments in securities of unaffiliated issuers as of the close of the reporting period as set forth in 210.12- 12 of Regulation S-X [17 CFR 210.12-12], unless the schedule is included as part of the report to shareholders filed under Item 1 of this Form. Included in Item 1 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. Portfolio Managers of Closed-End Management Investment Companies. (a) If the registrant is a closed-end management investment company that is filing an annual report on this Form N-CSR,provide the following information: (1) State the name, title, and length of service of the person or persons employed by or associated with the registrant or an investment adviser of the registrant who are primarily responsible for the day-to-day management of the registrants portfolio (Portfolio Manager). Also state each Portfolio Managers business experience during the past 5 years. Not applicable to open-end management investment companies. Item 9. Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers. (a) If the registrant is a closed-end management investment company, in the following tabular format, provide the information specified in paragraph (b) of this Item with respect to any purchase made by or on behalf of the registrant or any affiliated purchaser, as defined in Rule 10b-18(a)(3) under the Exchange Act (17 CFR 240.10b-18(a)(3)), of shares or other units of any class of the registrants equity securities that is registered by the registrant pursuant to Section 12 of the Exchange Act (15 U.S.C. 781). Instruction to paragraph (a). Disclose all purchases covered by this Item, including purchases that do not satisfy the conditions of the safe harbor of Rule 10b-18 under the Exchange Act (17 CFR 240.10b-18), made in the period covered by the report. Provide disclosures covering repurchases made on a monthly basis. For example, if the reporting period began on January 16 and ended on July 15, the chart would show repurchases for the months from January 16 through February 15, February 16 through March 15, March 16 through April 15, April 16 through May 15, May 16 through June 15, and June 16 through July 15. Not applicable to open-end management investment companies. Item 10. Submission of Matters to a Vote of Security Holders. Describe any material changes to the procedures by which shareholders may recommend nominees to the registrants board of directors, where those changes were implemented after the registrant last provided disclosure in response to the requirements of Item 7(d)(2)(ii)(G) of Schedule 14A (17 CFR 240.14a-101), or this Item. There have been no material changes to the procedures by which the shareholders may recommend nominees to the registrants board of directors since the registrant last provided disclosure in response to the requirements of Item 7(d)(2)(ii)(G) of Schedule 14(A) in its definitive proxy statement, or this Item. ITEM 11. 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 control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. The registrant's principal executive officer and principal financial officer, however, voluntarily are reporting the following information: In August of 2006 the registrant's investment adviser enhanced its internal procedures for reporting performance information required to be included in prospectuses. Those enhancements involved additional internal controls over the appropriateness of performance data generated for this purpose. Such enhancements were made following an internal review which identified prospectuses relating to certain classes of shares of a limited number of registrants where, inadvertently, performance information not reflecting the deduction of applicable sales charges was included. Those prospectuses were revised, and the revised prospectuses were distributed to shareholders. ITEM 12. 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 Series Trust II By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr, President Date February 28, 2011 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 February 28, 2011 By (Signature and Title)* /s/ Mark Bradley Mark Bradley, Treasurer Date February 28, 2011 * Print the name and title of each signing officer under his or her signature.