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, 2012 through June 30, 2012 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 -------------------------------------------------------------------------------- Semiannual Report | June 30, 2012 -------------------------------------------------------------------------------- Ticker Symbols: Class A PBMFX Class B PBMUX Class C MNBCX Class Y PBYMX [LOGO] PIONEER Investments(R) visit us: us.pioneerinvestments.com Table of Contents Letter to Shareowners 2 Portfolio Management Discussion 4 Portfolio Summary 7 Prices and Distributions 8 Performance Update 9 Comparing Ongoing Fund Expenses 13 Schedule of Investments 15 Financial Statements 29 Notes to Financial Statements 37 Trustees, Officers and Service Providers 44 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 1 President's Letter Dear Shareowner, The U.S. economy showed signs of an economic slowdown in the second quarter, reflecting higher savings by consumers and reduced spending by corporations, in large part due to concerns about both the U.S. outlook and the deteriorating situation in Europe. Some 40% - 45% of U.S. corporate earnings come from overseas, with a large portion of that from Europe. While large U.S. corporations generally remain in excellent financial health - cash, borrowing capacity, and margins are all strong - they are holding back on hiring and investments due to concerns about Europe, China, and U.S. regulations, fiscal policies, taxes, and politics. Many investors share those concerns, and are maintaining a cautious approach to the markets. Despite this tough backdrop, the markets had a surprisingly strong first half of 2012. The Standard & Poor's 500 Index returned 9.5% over the six months ended June 30, 2012. In the U.S. bond markets, interest rates generally declined, with riskier sectors faring the best. The broad bond market, as measured by the Barclays Capital Aggregate Bond Index, returned 2.4% during the same six-month period, while the high-yield bond market, as measured by the Bank of America Merrill Lynch High Yield Master II Index, returned 7.1%. Given the major macroeconomic and political issues facing the markets in the second half of the year, we certainly expect continuing volatility. But we also see some positive economic data that give us hope for better news in the second half of 2012. While the unemployment rate remains unacceptably high at over 8%, employment and incomes continue to trend upward. Lower oil prices have acted like an effective tax cut for consumers. Home construction, sales, and refinancings have increased, and auto sales are holding up as well. At Pioneer, we have long advocated the benefits of staying diversified* and investing for the long term. The strategy has generally performed well for many investors. 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. * Diversification does not assure a profit or protect against loss in a declining market. 2 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 Pioneer's investment professionals focus on finding good opportunities in both equity and bond markets using the same disciplined investment approach we have used since 1928. Our strategy is to identify undervalued individual securities with the greatest potential for success, carefully weighing risk against reward. Our teams of investment professionals continually monitor and analyze the relative valuations of different sectors and securities globally to help build portfolios that we believe can help you achieve your investment goals. 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 us.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 opinion 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 | Semiannual Report | 6/30/12 3 Portfolio Management Discussion | 6/30/12 In the following interview, portfolio manager David Eurkus reviews the market environment for municipal investments and the performance of AMT-Free Municipal Fund during the six months ended June 30, 2012. Mr. Eurkus, senior vice president and portfolio manager at Pioneer, is the lead portfolio manager of the Fund, which he co-manages with Timothy Pynchon, vice president portfolio manager at Pioneer. Q How did the Fund perform during the six months ended June 30, 2012? A Pioneer AMT-Free Municipal Fund Class A shares returned 7.02% at net asset value during the six months ended June 30, 2012, while the Fund's benchmark, the Barclays Capital Municipal Bond Index (the Barclays Index), returned 3.66%. During the same period, the average return of the 241 mutual funds in Lipper's General Municipal Debt Funds category was 4.98%. Q How would you describe the investment environment for tax-exempt bonds during the six months ended June 30, 2012? A Over the first six months of 2012, the investment environment was conducive to continued declines in interest rates. The U.S. economy continued to grow, though at a more moderate pace, and we saw no significant inflationary pressures domestically. The U.S. Federal Reserve (the Fed) continued to state that short-term interest rates would remain near zero for the foreseeable future. And though the United States is facing a budgetary "fiscal cliff" in January 2013 (when automatic tax hikes and dramatic spending cuts will ensue unless Congress takes action), investors foresaw no major changes in the fixed-income investing environment and continued to purchase tax-exempt bonds at a high volume, due to the bonds' attractive tax-equivalent yields compared with short- and longer-term taxable alternatives. An increase in municipal bond supply during the first half of 2012 was easily absorbed by healthy investor demand during the six-month period. During the six-month period, municipal bond price performance was strong, given that continuing economic turmoil in Greece, Italy and Spain meant that more fixed-income investors were looking to invest in credits here in the United States, including municipal bonds. Additionally, we continued to see an improving fiscal environment for many states and municipalities, as municipal leaders were able to trim their budgets as needed, and revenue streams began to improve for many states and cities. 4 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 Q What was your overall investment strategy for the portfolio during the six months ended June 30, 2012? A Our principal portfolio strategy is to purchase and hold discounted long-term municipal bonds, as those investments offer the highest yields in the tax-exempt marketplace. We believe that over the long term, our broadly diversified* strategy will enable the Fund to outperform the benchmark Barclays Index and its Lipper peers. The Fund also continues to have a strong focus on sectors vital to communities nationwide. The sectors include health care/hospitals, power and energy, public and private education, and transportation. During the six-month period, we maintained our emphasis on overall portfolio quality. As of June 30, 2012, 8.9% of the Fund's portfolio contained investments rated AAA or the equivalent, while 45.2% of portfolio assets were rated A or AA. In addition, the Fund's investments are broadly diversified among a wide range of municipal bond sectors. Q What were the most significant contributors to and detractors from the Fund's performance during the six months ended June 30, 2012? A As we were comfortable with the bond positions we had already built into the portfolio over the last two years - and with the Fund's long-duration stance - we did not make any significant alterations to the portfolio's structure during the six-month period. (Duration is a measure of a portfolio's price sensitivity to changes in interest rates.) The largest contributions to the Fund's benchmark-relative outperformance during the six-month period came from the portfolio's long-duration positioning on the municipal yield curve, overweights (relative to the Barclays Index) to the four municipal sectors mentioned above (health care/hospitals, power and energy, public and private education, and transportation), and the portfolio's continued overweights to A-rated and Baa-rated bonds. One individual Fund position--Massachusetts State Health & Education Facilities--detracted just slightly from performance during the six-month period. Q What is your outlook for the months ahead? A In the coming months, we expect the technical environment for municipal investments to continue to be favorable, with slightly higher supply levels being more than matched by healthy investor demand. Moreover, we continue to be encouraged by the improving credit posture for most states and municipalities. And though the European economic situation and the impending U.S. "fiscal cliff" will create uncertainty in the overall markets, * Diversification does not assure a profit or protect against loss in a declining market. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 5 we are confident that municipal bonds will remain an attractive alternative for investors, especially considering their much better yields compared with those offered by taxable-bond investments. The Fund will continue to hold select long-term tax-exempt bonds that we believe have the strongest opportunity to perform well. We will also continue to review the Fund's holdings to seek to ensure their integrity and quality as well as the timely payment of principal and interest on the investments. The Fund remains broadly diversified, with only limited exposure to general obligation bonds, which are more tied to states' general revenues. The vast majority of the Fund's holdings are in bonds with dedicated revenue streams ("revenue bonds"), which we continue to monitor closely. 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 15-28 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 market 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. A portion of income may be subject to local, state, federal and/or alternative minimum tax. Capital gains, if any, are subject to capital gains tax. These risks may increase share price volatility. 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 opinion as of the date of this report. These opinions should not be relied upon for any other purposes. 6 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 Portfolio Summary | 6/30/12 Portfolio Quality -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] BBB 32.9% A 24.8% AA 20.4% AAA 8.9% B 4.6% BB 2.3% CCC 0.1% Not Rated 6.0% Bond ratings are ordered highest to lowest in portfolio. Based on Standard & Poor's measures, AAA (highest possible rating) through BBB are considered investment grade; BB or lower ratings are considered non-investment grade. Cash equivalents and some bonds may not be rated. Sector Distribution -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Health Care 27.1% Insured 26.1% Education 10.2% Special Revenues 9.6% Power 6.0% General Obligation 4.6% Pollution Control Revenue 4.5% Transportation 4.3% Varlous Revenues 3.6% Escrowed 1.5% Housing 1.3% Water & Sewer 1.2% 10 Largest Holdings* -------------------------------------------------------------------------------- (As a percentage of long-term holdings) 1. California Statewide Communities Development Authority, 5.0%, 8/15/47 2.30% -------------------------------------------------------------------------------- 2. North Carolina Eastern Municipal Power Agency, 6.0%, 1/1/22 1.68 -------------------------------------------------------------------------------- 3. Public Authority for Colorado Energy, 6.5%, 11/15/38 1.68 -------------------------------------------------------------------------------- 4. Massachusetts Housing Finance Agency, 5.4%, 12/1/28 1.60 -------------------------------------------------------------------------------- 5. Massachusetts Health & Educational Facilities Authority, 5.5%, 7/1/32 1.53 -------------------------------------------------------------------------------- 6. Tampa-Hillsborough County Expressway Authority, 4.0%, 7/1/34 1.52 -------------------------------------------------------------------------------- 7. Texas Private Activity Bond Surface Transportation Corp., 7.0%, 6/30/40 1.36 -------------------------------------------------------------------------------- 8. Philadelphia Hospitals & Higher Education Facilities Authority, 5.0%, 7/1/34 1.31 -------------------------------------------------------------------------------- 9. Phoenix Civic Improvement Corp., 7/1/43 1.26 -------------------------------------------------------------------------------- 10. FYI Properties, 5.5%, 6/1/39 1.21 -------------------------------------------------------------------------------- * 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. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 7 Prices and Distributions | 6/30/12 Net Asset Value per Share -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 6/30/12 12/31/11 -------------------------------------------------------------------------------- A $14.06 $13.40 -------------------------------------------------------------------------------- B $13.97 $13.30 -------------------------------------------------------------------------------- C $13.95 $13.29 -------------------------------------------------------------------------------- Y $14.03 $13.37 -------------------------------------------------------------------------------- Distributions per Share: 1/1/12-6/30/12 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains -------------------------------------------------------------------------------- A $0.2760 $ -- $ -- -------------------------------------------------------------------------------- B $0.2126 $ -- $ -- -------------------------------------------------------------------------------- C $0.2221 $ -- $ -- -------------------------------------------------------------------------------- Y $0.2939 $ -- $ -- -------------------------------------------------------------------------------- Index Definition -------------------------------------------------------------------------------- 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 9-12. 8 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 Performance Update | 6/30/12 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 June 30, 2012) -------------------------------------------------------------------------------- Net Asset Public Offering Period Value (NAV) Price (POP) -------------------------------------------------------------------------------- 10 Years 5.43% 4.95% 5 Years 5.59 4.62 1 Year 13.90 8.75 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated May 1, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 0.87% 0.82% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer AMT-Free Barclays Capital Municipal Fund Municipal Bond Index 6/30/2002 $ 9,550 $ 10,000 6/30/2003 $ 10,546 $ 10,874 6/30/2004 $ 10,559 $ 10,957 6/30/2005 $ 11,667 $ 11,859 6/30/2006 $ 11,802 $ 11,964 6/30/2007 $ 12,346 $ 12,526 6/30/2008 $ 12,466 $ 12,931 6/30/2009 $ 12,104 $ 13,419 6/30/2010 $ 13,833 $ 14,709 6/30/2011 $ 14,230 $ 15,220 6/30/2012 $ 16,208 $ 16,727 Call 1-800-225-6292 or visit us.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 acquired the assets and liabilities 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 of the Fund's Class A shares would be lower than the performance shown. 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 May 1, 2013, 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. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 9 Performance Update | 6/30/12 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 June 30, 2012) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 4.55% 4.55% 5 Years 4.66 4.66 1 Year 12.87 8.87 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated May 1, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 1.74% 1.72% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer AMT-Free Barclays Capital Municipal Fund Municipal Bond Index 6/30/2002 $ 10,000 $ 10,000 6/30/2003 $ 10,955 $ 10,874 6/30/2004 $ 10,884 $ 10,957 6/30/2005 $ 11,926 $ 11,859 6/30/2006 $ 11,988 $ 11,964 6/30/2007 $ 12,426 $ 12,526 6/30/2008 $ 12,428 $ 12,931 6/30/2009 $ 11,964 $ 13,419 6/30/2010 $ 13,550 $ 14,709 6/30/2011 $ 13,827 $ 15,220 6/30/2012 $ 15,607 $ 16,727 Call 1-800-225-6292 or visit us.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. For more complete information, please see the prospectus. 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 acquired the assets and liabilities 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 of the Fund's Class B shares would be lower than the performance shown. 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 May 1, 2013, for Class B 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 taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. 10 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 Performance Update | 6/30/12 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 June 30, 2012) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class (10/1/2003) 4.24% 4.24% 5 Years 4.75 4.75 1 Year 13.03 13.03 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated May 1, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 1.61% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer AMT-Free Barclays Capital Municipal Fund Municipal Bond Index 10/31/2003 $ 10,000 $ 10,000 6/30/2004 $ 10,061 $ 10,119 6/30/2005 $ 10,992 $ 10,952 6/30/2006 $ 11,049 $ 11,049 6/30/2007 $ 11,474 $ 11,568 6/30/2008 $ 11,496 $ 11,942 6/30/2009 $ 11,065 $ 12,393 6/30/2010 $ 12,542 $ 13,584 6/30/2011 $ 12,801 $ 14,056 6/30/2012 $ 14,468 $ 15,448 Call 1-800-225-6292 or visit us.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 AMT-Free Municipal Fund acquired the assets and liabilities 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 of the Fund's Class C shares would be lower than the performance shown. 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. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 11 Performance Update | 6/30/12 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 June 30, 2012) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 5.58% 5.58% 5 Years 5.86 5.86 1 Year 14.13 14.13 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated May 1, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 0.57% 0.55% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $5 Million Investment Pioneer AMT-Free Barclays Capital Municipal Fund Municipal Bond Index 6/30/2002 $ 5,000,000 $ 5,000,000 6/30/2003 $ 5,522,292 $ 5,437,116 6/30/2004 $ 5,529,171 $ 5,478,301 6/30/2005 $ 6,109,113 $ 5,929,546 6/30/2006 $ 6,179,957 $ 5,982,035 6/30/2007 $ 6,475,831 $ 6,262,886 6/30/2008 $ 6,556,983 $ 6,465,389 6/30/2009 $ 6,381,920 $ 6,709,420 6/30/2010 $ 7,306,990 $ 7,354,349 6/30/2011 $ 7,542,214 $ 7,609,940 6/30/2012 $ 8,608,442 $ 8,363,357 Call 1-800-225-6292 or visit us.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 acquired the assets and liabilities 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, 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 of the Fund's Class Y shares would be lower than the performance shown. 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 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 of Class Y shares for the period between December 10, 2004, and the inception of Class Y shares on November 10, 2006, 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 May 1, 2013, 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. 12 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 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 January 1, 2012, through June 30, 2012. -------------------------------------------------------------------------------- Share Class A B C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 1/1/12 -------------------------------------------------------------------------------- Ending Account $1,070.20 $1,066.60 $1,066.60 $1,071.80 Value (after expenses) on 6/30/12 -------------------------------------------------------------------------------- Expenses Paid $4.22 $8.84 $8.07 $2.83 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 0.82%, 1.72%, 1.57% 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 182/366 (to reflect the one-half year period). Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 13 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 January 1, 2012, through June 30, 2012. -------------------------------------------------------------------------------- Share Class A B C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 1/1/12 -------------------------------------------------------------------------------- Ending Account $1,020.79 $1,016.31 $1,017.06 $1,022.13 Value (after expenses) on 6/30/12 -------------------------------------------------------------------------------- Expenses Paid $4.12 $8.62 $7.87 $2.77 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 0.82%, 1.72%, 1.57% and 0.55% for Class A, Class B, Class C and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 182/366 (to reflect the one-half year period). 14 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 Schedule of Investments | 6/30/12 (unaudited) ----------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (d) Ratings Value ----------------------------------------------------------------------------------------------- MUNICIPAL BONDS -- 99.4% Alabama -- 0.7% 5,000,000 A+/A1 Alabama Drinking Water Finance Authority, 4.0%, 8/15/28 $ 5,052,600 1,500,000 NR/NR Sylacauga Health Care Authority, 6.0%, 8/1/35 1,485,120 --------------- $ 6,537,720 ----------------------------------------------------------------------------------------------- Arizona -- 4.6% 1,000,000 AA-/Aa3 Arizona Board of Regents, 4.0%, $ 1,022,860 6/1/31 5,145,000 AA-/NR Arizona Health Facilities Authority, 5.5%, 1/1/38 5,653,532 3,345,000 AA/Aa2 Maricopa County High School District No 210-Phoenix, 3.5%, 7/1/25 3,395,677 1,000,000 A/A1 Maricopa County Pollution Control Corp., 5.0%, 6/1/35 1,083,530 4,000,000 AA/Aa3 Phoenix Civic Improvement Corp., 0.0%, 7/1/25 4,666,040 8,005,000 AA/Aa3 Phoenix Civic Improvement Corp., 0.0%, 7/1/26 9,334,310 10,000,000 AA/Aa3 Phoenix Civic Improvement Corp., 0.0%, 7/1/43 11,587,200 3,470,000 AA/Aa3 Pima County Industrial Development Authority, 5.0%, 7/1/20 3,939,560 500,000 BBB-/NR Pima County Industrial Development Authority, 6.1%, 6/1/45 503,895 954,000 NR/Baa3 Pima County Industrial Development Authority, 6.75%, 7/1/31 956,452 --------------- $ 42,143,056 ----------------------------------------------------------------------------------------------- California -- 15.9% 4,000,000 A-/A3 Alameda Corridor Transportation Authority, 4.75%, 10/1/25 $ 4,001,240 1,000,000 AAA/Aaa California Educational Facilities Authority, 5.25%, 4/1/40 1,393,550 2,000,000 A/NR California Health Facilities Financing Authority, 5.0%, 3/1/33 2,011,180 2,000,000 A/A2 California Health Facilities Financing Authority, 5.625%, 7/1/32 2,180,780 4,000,000 BBB/Baa2 California Municipal Finance Authority, 5.25%, 2/1/37 4,058,360 4,875,000 NR/Baa2 California Statewide Communities Development Authority, 5.0%, 5/15/30 4,986,735 4,125,000 NR/Baa2 California Statewide Communities Development Authority, 5.0%, 5/15/38 4,165,260 20,955,000 BBB+/Baa2 California Statewide Communities Development Authority, 5.0%, 8/15/47 21,062,918 10,000,000 AA-/Aa3 California Statewide Communities Development Authority, 5.25%, 11/15/48 10,576,600 The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 15 Schedule of Investments | 6/30/12 (unaudited) (continued) ----------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (d) Ratings Value ----------------------------------------------------------------------------------------------- California -- (continued) 4,000,000 NR/Baa1 California Statewide Communities Development Authority, 5.375%, 12/1/37 $ 4,026,880 10,000,000 AA-/A1 California Statewide Communities Development Authority, 5.75%, 7/1/47 10,811,400 4,000,000 A-/NR California Statewide Communities Development Authority, 5.75%, 8/15/38 4,361,000 1,000,000 NR/Aa3 Franklin-Mckinley School District, 6.0%, 7/1/16 1,189,330 2,100,000 A-/WR Fresno Joint Powers Financing Authority, 4.75%, 9/1/28 2,101,575 15,000,000 B-/B3 Golden State Tobacco Securitization Corp., 5.125%, 6/1/47 10,823,400 2,500,000 BBB+/Ba1 Inglewood Redevelopment Agency, 4.75%, 5/1/38 2,294,375 3,000,000 A-/Baa2 Long Beach Bond Finance Authority, 5.5%, 11/15/37 3,255,510 4,000,000 A-/NR Madera Irrigation District, 5.5%, 4,310,240 1/1/33 3,680,000 A/Baa2 Madera Public Financing Authority, 4.375%, 3/1/31 3,749,184 1,600,000 AA-/WR Oxnard School District, 4.375%, 8/1/33 1,622,896 3,815,000 BBB/NR Pittsburg Redevelopment Agency, 4.25%, 9/1/34 3,115,100 7,000,000 BBB/NR Pittsburg Redevelopment Agency, 6.5%, 9/1/28 7,535,710 2,180,000 A/Baa2 Pomona Unified School District, 6.55%, 8/1/29 2,853,729 1,000,000 A-/NR Redding Redevelopment Agency, 4.5%, 9/1/26 995,070 3,000,000 A-/NR Rialto Redevelopment Agency, 6.25%, 9/1/37 3,154,200 1,500,000 AA-/Aa1 San Jose Evergreen Community College District, 5.0%, 8/1/41 1,672,260 7,365,000 BBB/Ba2 San Jose Redevelopment Agency, 4.9%, 8/1/33 6,651,921 2,085,000 NR/Aa2 San Juan Unified School District, 5.0%, 8/1/25 2,424,146 1,500,000 A/Ba1 Santa Cruz County Redevelopment Agency, 6.625%, 9/1/29 1,745,340 1,405,000 A+/Aa3 Santa Maria Joint Union High School District, 0.0%, 8/1/27 (b) 671,815 3,500,000 A+/Aa2 Saugus Union School District, 0.0%, 8/1/23 (b) 2,268,035 9,500,000 A-/A1 State of California, 4.25%, 8/1/33 9,626,255 --------------- $ 145,695,994 ----------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 16 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 ----------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (d) Ratings Value ----------------------------------------------------------------------------------------------- Colorado -- 4.7% 5,555,000 A-/A3 City of Colorado Springs Colorado, 6.375%, 12/15/30 $ 5,562,610 2,750,000 5.25 AA-/Aa3 Colorado Health Facilities Authority, Floating Rate Note, 11/15/35 2,927,568 15,000,000 BBB/Baa2 E-470 Public Highway Authority, 0.0%, 9/1/23 (b) 8,871,150 5,000,000 BBB/Baa2 E-470 Public Highway Authority, 0.0%, 9/1/27 (b) 2,291,200 12,500,000 A-/Baa2 Public Authority for Colorado Energy, 6.5%, 11/15/38 15,421,125 2,500,000 NR/Baa3 Regional Transportation District, 6.0%, 1/15/26 2,859,100 1,250,000 NR/Baa3 Regional Transportation District, 6.0%, 1/15/34 1,407,675 1,000,000 NR/Baa3 Regional Transportation District, 6.0%, 1/15/41 1,114,560 2,000,000 NR/Baa3 Regional Transportation District, 6.5%, 1/15/30 2,353,020 --------------- $ 42,808,008 ----------------------------------------------------------------------------------------------- Connecticut -- 0.5% 1,000,000 NR/NR Connecticut State Health & Educational Facility Authority, 5.5%, 7/1/17 $ 1,011,500 1,500,000 B/NR Mohegan Tribe of Indians of Connecticut, 5.25%, 1/1/33 (144A) 1,248,045 2,470,000 B/NR Mohegan Tribe of Indians of Connecticut, 6.25%, 1/1/31 2,353,095 --------------- $ 4,612,640 ----------------------------------------------------------------------------------------------- District of Columbia -- 2.0% 10,000,000 BBB/Baa1 District of Columbia Tobacco Settlement Financing Corp., 6.75%, 5/15/40 $ 10,190,100 7,950,000 NR/A1 District of Columbia, 4.25%, 6/1/37 7,970,750 --------------- $ 18,160,850 ----------------------------------------------------------------------------------------------- Florida -- 6.2% 7,500,000 NR/Baa1 City of Tallahassee Florida, 6.375%, 12/1/30 $ 7,510,500 520,000 NR/NR County of Madison Florida, 6.0%, 7/1/25 498,815 5,000,000 A-/A2 County of Miami-Dade Florida Aviation Revenue, 5.5%, 10/1/41 5,598,200 4,885,000 A/Aa3 County of Miami-Dade Florida, 5.0%, 6/1/22 5,090,023 1,000,000 NR/Aa2 County of Miami-Dade Florida, 7.7%, 10/1/12 1,017,840 The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 17 Schedule of Investments | 6/30/12 (unaudited) (continued) ----------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (d) Ratings Value ----------------------------------------------------------------------------------------------- Florida -- (continued) 8,000,000 AA+/Aa1 Escambia County Health Facilities Authority, 5.25%, 11/15/32 $ 8,135,360 3,000,000 NR/Baa1 Escambia County Health Facilities Authority, 6.0%, 8/15/36 3,316,200 1,390,000 NR/NR Florida Development Finance Corp., 6.0%, 9/15/30 1,474,860 1,830,000 A+/Aa3 Greater Orlando Aviation Authority, 5.0%, 10/1/25 2,098,772 2,980,000 BB+/NR Lee County Industrial Development Authority Florida, 4.75%, 6/15/14 3,052,235 2,000,000 BB+/NR Lee County Industrial Development Authority Florida, 5.375%, 6/15/37 1,976,920 3,400,000 NR/NR St Johns County Industrial Development Authority, 6.0%, 8/1/45 3,715,928 13,780,000 A-/A3 Tampa-Hillsborough County Expressway Authority, 4.0%, 7/1/34 13,907,052 --------------- $ 57,392,705 ----------------------------------------------------------------------------------------------- Georgia -- 1.5% 5,750,000 A/Baa1 Burke County Development Authority, 7.0%, 1/1/23 $ 6,857,738 5,000,000 A-/Baa2 Main Street Natural Gas, Inc., 5.5%, 9/15/28 5,516,550 1,500,000 A/A2 Municipal Electric Authority of Georgia, 5.625%, 1/1/26 1,702,575 --------------- $ 14,076,863 ----------------------------------------------------------------------------------------------- Idaho -- 0.1% 1,000,000 NR/Aa1 Idaho Board Bank Authority, 4.0%, 9/15/41 $ 1,002,280 ----------------------------------------------------------------------------------------------- Illinois -- 3.8% 1,580,000 NR/A3 Illinois Finance Authority, 5.25%, 10/1/24 $ 1,688,846 1,000,000 BBB+/Baa2 Illinois Finance Authority, 5.25%, 1,045,660 5/1/40 4,000,000 BBB-/NR Illinois Finance Authority, 5.5%, 4,083,040 8/15/30 1,600,000 AA-/Aa3 Illinois Finance Authority, 6.0%, 1,696,928 8/15/25 1,000,000 NR/NR Illinois Finance Authority, 6.125%, 5/15/27 1,036,680 5,000,000 NR/Baa2 Illinois Finance Authority, 6.5%, 5,472,850 4/1/39 20,000,000 AAA/A3 Metropolitan Pier & Exposition Authority, 0.0%, 6/15/39 4,767,200 7,500,000 AAA/A3 Metropolitan Pier & Exposition Authority, 5.25%, 6/15/42 7,588,650 5,000,000 AA+/Aaa Metropolitan Pier & Exposition Authority, 7.0%, 7/1/26 (Pre-Refunded) 7,197,100 --------------- $ 34,576,954 ----------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 18 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 ----------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (d) Ratings Value ----------------------------------------------------------------------------------------------- Indiana -- 2.5% 3,500,000 NR/Baa2 Delaware County Hospital Authority Indiana, 5.0%, 8/1/24 $ 3,698,555 2,000,000 AA/Aa2 Indiana Bond Bank, 5.5%, 2/1/29 2,237,240 2,000,000 BB/B1 Indiana Finance Authority, 6.0%, 12/1/26 2,138,860 5,000,000 A+/A1 Indiana Health & Educational Facilities Financing Authority, 4.75%, 2/15/34 5,193,700 7,000,000 A+/A1 Indiana Health & Educational Facilities Financing Authority, 5.0%, 2/15/39 7,293,930 500,000 AA/Aa1 Indianapolis Local Public Improvement Bond Bank, 6.0%, 1/10/20 584,330 650,000 AA/NR Indianapolis Local Public Improvement Bond Bank, 6.75%, 2/1/14 (Pre-Refunded) 683,397 760,000 A-/A1 Lawrence Township Metropolitan School District, 6.75%, 7/5/13 778,924 --------------- $ 22,608,936 ----------------------------------------------------------------------------------------------- Louisiana -- 2.8% 6,000,000 BBB-/Baa2 Jefferson Parish Hospital Service District No 2, 6.375%, 7/1/41 $ 6,712,320 690,000 BBB+/Baa1 Louisiana Local Government Environmental Facilities & Community Development Authority, 5.25%, 12/1/18 748,567 10,000,000 NR/Baa1 Louisiana Public Facilities Authority, 5.5%, 5/15/47 10,299,300 500,000 AA-/Aa3 Louisiana State Citizens Property Insurance Corp., 5.0%, 6/1/24 567,470 400,000 A-/A3 Louisiana State Citizens Property Insurance Corp., 5.0%, 6/1/24 447,888 3,000,000 BBB/Baa2 Parish of St John the Baptist Louisiana, 5.125%, 6/1/37 3,137,070 1,000,000 AA/Aa1 State of Louisiana Gasoline & Fuels Tax Revenue, 4.5%, 5/1/41 1,024,380 3,000,000 A-/A3 Tobacco Settlement Financing Corp. Louisiana, 5.875%, 5/15/39 3,063,330 --------------- $ 26,000,325 ----------------------------------------------------------------------------------------------- Maine -- 0.9% 4,500,000 NR/Baa3 Maine Health & Higher Educational Facilities Authority, 6.75%, 7/1/36 $ 5,178,150 3,040,000 NR/Baa3 Maine Health & Higher Educational Facilities Authority, 6.95%, 7/1/41 3,518,162 --------------- $ 8,696,312 ----------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 19 Schedule of Investments | 6/30/12 (unaudited) (continued) ----------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (d) Ratings Value ----------------------------------------------------------------------------------------------- Maryland -- 1.5% 3,000,000 BB+/Ba2 County of Frederick Maryland, 5.625%, 9/1/38 $ 2,921,610 1,000,000 NR/NR Maryland Economic Development Corp., 5.0%, 12/1/16 891,800 500,000 NR/NR Maryland Economic Development Corp., 5.0%, 12/1/16 445,900 1,000,000 NR/NR Maryland Economic Development Corp., 5.0%, 12/1/31 668,860 1,200,000 BB/NR Maryland Economic Development Corp., 5.75%, 9/1/25 1,276,644 2,000,000 A/A3 Maryland Economic Development Corp., 6.2%, 9/1/22 2,424,280 4,400,000 NR/Baa3 Maryland Health & Higher Educational Facilities Authority, 5.75%, 7/1/38 4,675,132 --------------- $ 13,304,226 ----------------------------------------------------------------------------------------------- Massachusetts -- 10.3% 4,000,000 NR/Aa2 City of Pittsfield Massachusetts, 5.0%, 3/1/19 $ 4,825,560 1,000,000 A-/A3 Massachusetts Development Finance Agency, 5.0%, 10/1/21 1,219,240 1,000,000 A-/A3 Massachusetts Development Finance Agency, 5.0%, 10/1/22 1,203,740 1,000,000 BBB+/A3 Massachusetts Development Finance Agency, 5.0%, 10/1/30 1,087,150 500,000 BBB+/A3 Massachusetts Development Finance Agency, 5.0%, 10/1/31 545,605 1,585,000 AA+/Aa1 Massachusetts Development Finance Agency, 5.0%, 6/1/25 1,862,407 1,000,000 A-/Baa1 Massachusetts Development Finance Agency, 5.125%, 7/1/26 1,074,970 345,000 BBB/Baa2 Massachusetts Development Finance Agency, 5.15%, 10/1/14 354,025 1,680,000 BBB/NR Massachusetts Development Finance Agency, 5.25%, 10/1/29 1,743,840 3,320,000 BBB/NR Massachusetts Development Finance Agency, 5.25%, 10/1/37 3,394,600 1,980,000 AA-/A1 Massachusetts Development Finance Agency, 5.375%, 4/1/41 2,187,009 500,000 BBB-/NR Massachusetts Development Finance Agency, 5.5%, 1/1/35 500,115 1,100,000 BBB/Baa2 Massachusetts Development Finance Agency, 5.625%, 10/1/24 1,138,357 1,000,000 BBB/Baa2 Massachusetts Development Finance Agency, 5.7%, 10/1/34 1,027,330 6,185,000 A/WR Massachusetts Development Finance Agency, 5.75%, 1/1/42 7,664,205 The accompanying notes are an integral part of these financial statements. 20 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 ----------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (d) Ratings Value ----------------------------------------------------------------------------------------------- Massachusetts -- (continued) 2,635,000 NR/NR Massachusetts Development Finance Agency, 6.25%, 10/15/17 $ 2,744,063 1,000,000 BBB/NR Massachusetts Development Finance Agency, 6.75%, 1/1/36 1,156,020 1,000,000 BBB/NR Massachusetts Development Finance Agency, 7.0%, 7/1/42 1,165,770 2,000,000 NR/A2 Massachusetts Health & Educational Facilities Authority, 4.125%, 10/1/37 2,035,100 4,500,000 BB/NR Massachusetts Health & Educational Facilities Authority, 4.625%, 8/15/28 4,152,465 6,265,000 AAA/Aaa Massachusetts Health & Educational Facilities Authority, 5.125%, 7/15/37 6,278,658 3,750,000 BBB+/Baa1 Massachusetts Health & Educational Facilities Authority, 5.25%, 7/1/38 3,862,762 1,550,000 BBB-/Baa3 Massachusetts Health & Educational Facilities Authority, 5.25%, 7/15/18 1,551,906 2,335,000 BBB-/Baa3 Massachusetts Health & Educational Facilities Authority, 5.375%, 7/1/35 2,461,440 10,140,000 AAA/Aaa Massachusetts Health & Educational Facilities Authority, 5.5%, 7/1/32 14,026,155 14,675,000 BBB/Baa2 Massachusetts Housing Finance Agency, 5.4%, 12/1/28 14,688,941 3,975,000 AA/Aa2 Massachusetts State College Building Authority, 5.0%, 5/1/28 4,644,152 2,000,000 AAA/NR Town of Chatham Massachusetts, 3.5%, 6/15/37 1,957,540 4,500,000 AA+/NR Town of Wilmington Massachusetts, 4.0%, 3/15/37 4,510,575 --------------- $ 95,063,700 ----------------------------------------------------------------------------------------------- Michigan -- 1.9% 3,000,000 AA-/Aa3 City of Detroit Michigan Water Supply System Revenue, 6.25%, 7/1/36 $ 3,454,320 1,500,000 BB-/NR John Tolfree Health System Corp., 6.0%, 9/15/23 1,403,385 1,465,000 NR/NR Meridian Economic Development Corp. Michigan, 5.25%, 7/1/26 1,465,161 3,285,000 NR/NR Michigan Public Educational Facilities Authority, 5.875%, 6/1/37 3,190,753 2,000,000 NR/NR Michigan State Hospital Finance Authority, 5.25%, 11/15/25 2,002,520 5,000,000 AA+/Aa1 Michigan State Hospital Finance Authority, 5.25%, 11/15/26 5,215,000 1,000,000 NR/NR Michigan State Hospital Finance Authority, 5.5%, 11/15/35 980,600 --------------- $ 17,711,739 ----------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 21 Schedule of Investments | 6/30/12 (unaudited) (continued) ----------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (d) Ratings Value ----------------------------------------------------------------------------------------------- Minnesota -- 0.7% 5,000,000 8.50 A/A1 City of Becker Minnesota, Floating Rate Note, 4/1/30 $ 5,102,350 1,000,000 A-/NR Tobacco Securitization Authority Minnesota, 5.25%, 3/1/31 1,101,080 --------------- $ 6,203,430 ----------------------------------------------------------------------------------------------- Mississippi -- 1.3% 7,950,000 BBB-/Ba1 County of Lowndes Mississippi, 6.8%, 4/1/22 $ 9,072,381 2,750,000 BBB/Baa3 County of Warren Mississippi, 5.8%, 5/1/34 2,996,070 --------------- $ 12,068,451 ----------------------------------------------------------------------------------------------- Missouri -- 0.0% 80,000 NR/Aaa Missouri State Environmental Improvement & Energy Resources Authority, 5.125%, 1/1/20 $ 81,833 ----------------------------------------------------------------------------------------------- Montana -- 0.3% 2,785,000 A-/A3 City of Forsyth Montana, 5.0%, 3/1/31 $ 2,838,639 ----------------------------------------------------------------------------------------------- New Hampshire -- 1.2% 5,000,000 A-/NR New Hampshire Health & Education Facilities Authority, 5.0%, 10/1/32 $ 5,208,100 3,750,000 A-/NR New Hampshire Health & Education Facilities Authority, 5.0%, 10/1/37 3,868,500 2,000,000 BBB+/Baa1 New Hampshire Health & Education Facilities Authority, 5.75%, 7/1/22 2,025,220 --------------- $ 11,101,820 ----------------------------------------------------------------------------------------------- New Jersey -- 1.8% 1,250,000 BBB/Baa3 Camden County Improvement Authority, 5.75%, 2/15/34 $ 1,269,875 475,000 NR/NR New Jersey Economic Development Authority, 5.3%, 11/1/26 446,590 450,000 NR/NR New Jersey Economic Development Authority, 5.375%, 11/1/36 398,079 610,000 NR/NR New Jersey Economic Development Authority, 5.75%, 1/1/25 612,812 3,000,000 AAA/Aaa New Jersey Educational Facilities Authority, 5.0%, 7/1/39 3,460,200 5,115,000 BBB-/Baa3 New Jersey Health Care Facilities Financing Authority, 5.25%, 7/1/30 5,214,078 3,500,000 NR/NR New Jersey Health Care Facilities Financing Authority, 7.25%, 7/1/27 3,151,960 2,000,000 A+/A1 New Jersey Transportation Trust Fund Authority, 5.5%, 6/15/41 2,307,040 --------------- $ 16,860,634 ----------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 22 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 ----------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (d) Ratings Value ----------------------------------------------------------------------------------------------- New Mexico -- 0.1% 1,000,000 A/NR County of Dona Ana New Mexico, 5.25%, 12/1/25 $ 1,032,990 ----------------------------------------------------------------------------------------------- New York -- 3.1% 2,500,000 BBB+/A3 Albany Industrial Development Agency, 5.25%, 11/15/32 $ 2,663,450 1,000,000 NR/WR Albany Industrial Development Agency, 6.0%, 7/1/19 500,970 6,000,000 AAA/Aaa New York State Dormitory Authority, 5.0%, 10/1/41 6,868,020 5,515,000 BBB/WR New York State Dormitory Authority, 5.25%, 7/1/24 6,237,465 5,250,000 AA-/Aa3 New York State Dormitory Authority, 7.5%, 5/15/13 5,581,170 1,000,000 BBB-/Baa3 Port Authority of New York & New Jersey, 6.0%, 12/1/36 1,120,520 3,400,000 BBB-/Baa3 Port Authority of New York & New Jersey, 6.0%, 12/1/42 3,771,450 1,500,000 AA-/Aa2 Port Authority of New York & New Jersey, 6.125%, 6/1/94 1,835,040 --------------- $ 28,578,085 ----------------------------------------------------------------------------------------------- North Carolina -- 2.0% 1,790,000 NR/NR North Carolina Capital Facilities Finance Agency, 4.5%, 10/1/26 $ 1,491,142 700,000 BBB-/Baa North Carolina Capital Facilities Finance Agency, 5.0%, 6/1/27 679,903 1,000,000 BBB-/Baa North Carolina Capital Facilities Finance Agency, 5.0%, 6/1/32 903,990 12,000,000 A-/Baa1 North Carolina Eastern Municipal Power Agency, 6.0%, 1/1/22 15,428,280 --------------- $ 18,503,315 ----------------------------------------------------------------------------------------------- Ohio -- 3.0% 6,840,000 B-/B3 Buckeye Tobacco Settlement Financing Authority, 5.125%, 6/1/24 $ 5,504,353 10,000,000 B-/B3 Buckeye Tobacco Settlement Financing Authority, 5.75%, 6/1/34 7,656,900 6,000,000 B-/B3 Buckeye Tobacco Settlement Financing Authority, 6.5%, 6/1/47 5,037,780 1,000,000 AAA/Aaa City of Cincinnati Ohio Water System Revenue, 5.0%, 12/1/37 1,135,810 1,500,000 NR/NR County of Cuyahoga Ohio, 6.0%, 5/15/37 1,519,455 1,500,000 NR/NR County of Cuyahoga Ohio, 6.0%, 5/15/42 1,518,810 5,000,000 NR/Baa1 County of Lake Ohio, 6.0%, 8/15/43 5,317,650 --------------- $ 27,690,758 ----------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 23 Schedule of Investments | 6/30/12 (unaudited) (continued) ----------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (d) Ratings Value ----------------------------------------------------------------------------------------------- Oklahoma -- 0.7% 5,590,000 BBB/Baa2 McGee Creek Authority, 6.0%, 1/1/23 $ 6,486,356 ----------------------------------------------------------------------------------------------- Oregon -- 0.3% 2,365,000 A+/A1 Oregon Health & Science University, 3.75%, 7/1/27 $ 2,397,353 ----------------------------------------------------------------------------------------------- Pennsylvania -- 4.9% 2,605,000 NR/WR Allentown Area Hospital Authority, 6.0%, 11/15/16 $ 2,611,721 1,000,000 CCC/NR Columbia County Hospital Authority, 5.8%, 6/1/19 1,000,550 10,000,000 A-/Baa2 Lehigh County Industrial Development Authority, 4.75%, 2/15/27 10,229,500 1,000,000 BBB/NR Montgomery County Industrial Development Authority Pennsylvania, 5.0%, 12/1/24 1,036,300 1,000,000 BBB/NR Montgomery County Industrial Development Authority Pennsylvania, 5.0%, 12/1/30 1,019,920 3,000,000 BBB+/A3 Northampton County General Purpose Authority, 5.5%, 8/15/40 3,123,090 1,000,000 BBB-/Baa3 Pennsylvania Higher Educational Facilities Authority, 5.0%, 7/1/42 1,025,250 1,000,000 BBB-/Baa3 Pennsylvania Higher Educational Facilities Authority, 6.0%, 7/1/43 1,108,400 11,500,000 0.96 BBB+/WR Pennsylvania Higher Educational Facilities Authority, Floating Rate Note, 7/1/39 6,517,970 4,000,000 AA/Aa2 Philadelphia Hospitals & Higher Education Facilities Authority, 4.5%, 7/1/37 4,121,000 12,900,000 BBB-/Ba1 Philadelphia Hospitals & Higher Education Facilities Authority, 5.0%, 7/1/34 12,051,438 1,000,000 AA-/Aa3 Sports & Exhibition Authority of Pittsburgh and Allegheny County, 5.0%, 2/1/30 1,077,810 --------------- $ 44,922,949 ----------------------------------------------------------------------------------------------- Puerto Rico -- 0.8% 1,000,000 BBB/Baa1 Commonwealth of Puerto Rico, 5.0%, 7/1/41 $ 984,940 925,000 BBB/Baa1 Puerto Rico Public Buildings Authority, 5.25%, 7/1/33 931,160 75,000 NR/Baa3 Puerto Rico Public Buildings Authority, 5.25%, 7/1/33 (Pre-Refunded) 82,084 5,000,000 AA-/Aa2 Puerto Rico Sales Tax Financing Corp., 5.25%, 8/1/57 5,227,400 --------------- $ 7,225,584 ----------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 24 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 ----------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (d) Ratings Value ----------------------------------------------------------------------------------------------- Rhode Island -- 0.6% 35,000 A-/Baa1 Rhode Island Health & Educational Building Corp., 6.375%, 8/15/21 $ 35,137 5,200,000 BB/Ba1 Tobacco Settlement Financing Corp. Rhode Island, 6.25%, 6/1/42 5,290,012 --------------- $ 5,325,149 ----------------------------------------------------------------------------------------------- South Carolina -- 1.1% 8,265,000 AA-/Aa3 South Carolina State Public Service Authority, 5.0%, 12/1/43 $ 9,201,177 500,000 AA+/Aaa State of South Carolina, 5.0%, 4/1/20 627,785 --------------- $ 9,828,962 ----------------------------------------------------------------------------------------------- South Dakota -- 0.1% 65,000 NR/Aaa South Dakota Conservancy District, 5.625%, 8/1/17 (Pre-Refunded) $ 65,283 1,000,000 A+/A1 South Dakota Health & Educational Facilities Authority, 5.0%, 7/1/42 1,070,310 --------------- $ 1,135,593 ----------------------------------------------------------------------------------------------- Tennessee -- 0.5% 4,000,000 AA/Aa1 Metropolitan Government of Nashville & Davidson County Tennessee, 4.0%, 7/1/24 $ 4,479,320 ----------------------------------------------------------------------------------------------- Texas -- 5.2% 7,100,000 BBB-/Baa3 Central Texas Regional Mobility Authority, 0.0%, 1/1/25 $ 3,932,832 3,000,000 BBB-/Baa3 Central Texas Regional Mobility Authority, 0.0%, 1/1/26 1,551,990 3,000,000 BBB-/Baa3 Central Texas Regional Mobility Authority, 0.0%, 1/1/27 1,457,310 2,500,000 BB+/Ba1 Central Texas Regional Mobility Authority, 6.75%, 1/1/41 2,801,950 10,000,000 BBB+/A3 Dallas County Utility & Reclamation District, 5.375%, 2/15/29 10,640,300 390,000 AAA/Aaa Houston Higher Education Finance Corp., 5.0%, 5/15/40 443,180 2,000,000 NR/Aaa La Joya Independent School District, 4.0%, 2/15/22 2,304,960 20,000 NR/A1 Lower Colorado River Authority, 5.25%, 5/15/21 (Pre-Refunded) 20,805 3,000,000 A/Baa2 Richardson Hospital Authority, 6.0%, 12/1/34 3,082,470 1,000,000 BBB/NR Seguin Higher Education Facilities Corp., 5.0%, 9/1/23 1,022,430 5,000,000 AA+/Aaa State of Texas, 5.0%, 8/1/27 5,914,200 10,410,000 NR/Baa3 Texas Private Activity Bond Surface Transportation Corp., 7.0%, 6/30/40 12,467,641 The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 25 Schedule of Investments | 6/30/12 (unaudited) (continued) ----------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (d) Ratings Value ----------------------------------------------------------------------------------------------- Texas -- (continued) 2,255,000 BBB/NR Texas State Public Finance Authority Charter School Finance Corp., 6.2%, 2/15/40 $ 2,591,018 --------------- $ 48,231,086 ----------------------------------------------------------------------------------------------- Utah -- 0.1% 500,000 BBB-/NR Utah State Charter School Finance Authority, 5.75%, 7/15/20 $ 526,605 ----------------------------------------------------------------------------------------------- Vermont -- 0.1% 1,295,000 BBB-/Baa Vermont Educational & Health Buildings Financing Agency, 5.0%, 7/1/24 $ 1,210,540 ----------------------------------------------------------------------------------------------- Virginia -- 3.3% 5,000,000 BBB/Baa2 Chesapeake Bay Bridge & Tunnel District, 5.5%, 7/1/25 $ 5,675,850 1,500,000 NR/WR Prince William County Industrial Development Authority, 5.2%, 10/1/26 (Pre-Refunded) 1,620,720 3,925,000 NR/WR Prince William County Industrial Development Authority, 5.35%, 10/1/36 (Pre-Refunded) 4,248,263 13,990,000 B-/B2 Tobacco Settlement Financing Corp. Virginia, 5.0%, 6/1/47 9,314,122 7,500,000 BBB+/Baa1 Washington County Industrial Development Authority Virginia, 7.75%, 7/1/38 9,212,775 --------------- $ 30,071,730 ----------------------------------------------------------------------------------------------- Washington -- 7.7% 10,000,000 AA+/Aa1 City of Seattle Washington, 4.0%, 9/1/37 $ 10,023,500 10,000,000 AA/NR FYI Properties, 5.5%, 6/1/39 11,090,100 1,000,000 AA+/Aa1 King & Snohomish Counties School District No 417 Northshore, 5.0%, 12/1/30 1,171,450 1,000,000 AA+/Aa1 King & Snohomish Counties School District No 417 Northshore, 5.0%, 12/1/31 1,163,980 10,000,000 AAA/NR King County Housing Authority, 5.5%, 5/1/38 10,785,500 3,000,000 A+/Aa3 King County Public Hospital District No 1, 5.25%, 12/1/37 3,236,910 1,000,000 AA+/Aa1 Pierce County School District No 3 Puyallup, 5.0%, 12/1/23 1,227,930 10,500,000 BBB/Baa1 Tobacco Settlement Authority of Washington, 6.625%, 6/1/32 10,920,000 5,600,000 AA+/Aaa University of Washington, 5.0%, 6/1/37 6,204,800 The accompanying notes are an integral part of these financial statements. 26 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 ----------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (d) Ratings Value ----------------------------------------------------------------------------------------------- Washington -- (continued) 2,400,000 BBB/Baa2 Washington Health Care Facilities Authority, 6.125%, 8/15/37 $ 2,575,536 4,000,000 NR/A2 Washington Health Care Facilities Authority, 6.5%, 11/15/33 4,461,000 5,000,000 5.25 AA/Aa2 Washington Health Care Facilities Authority, Floating Rate Note, 10/1/33 5,436,550 2,500,000 NR/NR Washington State Housing Finance Commission, 5.25%, 1/1/17 2,489,100 --------------- $ 70,786,356 ----------------------------------------------------------------------------------------------- Wisconsin -- 0.5% 1,430,000 NR/A1 Adams-Friendship Area School District, 6.5%, 4/1/16 $ 1,700,213 3,000,000 A+/NR Wisconsin Health & Educational Facilities Authority, 5.125%, 8/15/35 3,202,050 --------------- $ 4,902,263 ----------------------------------------------------------------------------------------------- Wyoming -- 0.1% 1,000,000 A+/NR County of Laramie Wyoming, 5.0%, 5/1/37 $ 1,069,940 ----------------------------------------------------------------------------------------------- TOTAL MUNICIPAL BONDS (Cost $853,533,433) $ 913,952,049 ----------------------------------------------------------------------------------------------- TOTAL INVESTMENT IN SECURITIES -- 99.4% (Cost $853,533,432) (a) $ 913,952,049 ----------------------------------------------------------------------------------------------- OTHER ASSETS & LIABILITIES -- 0.6% $ 5,368,044 ----------------------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $ 919,320,093 =============================================================================================== (Pre-Refunded) Pre-refunded bonds have been collateralized by U.S. Treasury securities which are held in escrow and used to pay principal and interest on the tax-exempt issue and to retire the bonds in full at the earliest refunding date. NR Not rated by either S&P or Moody's. WR Rating withdrawn by either S&P or Moody's. (144A) Security is exempt from registration under Rule 144A of the Securities Act of 1933. Such securities may be resold normally to qualified institutional buyers in a transaction exempt from registration. At June 30, 2012, the value of these securities amounted to $1,248,045 or 0.1% of total net assets. (a) At June 30, 2012, the net unrealized gain on investments based on cost for federal income tax purposes of $851,747,726 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $ 71,650,228 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (9,445,905) ------------ Net unrealized gain $ 62,204,323 ============ The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 27 Schedule of Investments | 6/30/12 (unaudited) (continued) (b) Security is issued with a zero coupon. Income is earned through accretion of discount. (d) Debt obligation with a variable interest rate. Rate shown is rate at period end. Purchases and sales of securities (excluding temporary cash investments) for the six months ended June 30, 2012 aggregated $168,922,197 and $105,018,847, 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. 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, fixed income securities and senior loans as Level 2 and securities valued using fair value methods (other than prices supplied by independent pricing services) are categorized as Level 3. See Notes to Financial Statements - Note 1A. The following is a summary of the inputs used as of June 30, 2012, in valuing the Fund's assets: --------------------------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total --------------------------------------------------------------------------------------------------- Municipal Bonds $-- $913,952,049 $-- $913,952,049 --------------------------------------------------------------------------------------------------- Total $-- $913,952,049 $-- $913,952,049 --------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 28 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 Statement of Assets and Liabilities | 6/30/12 (unaudited) ASSETS: Investment in securities (cost $853,533,432) $ 913,952,049 Receivables -- Investment securities sold 103,021 Fund shares sold 1,579,655 Interest 12,841,962 Due from Pioneer Investment Management, Inc. 14,773 Other 46,650 ----------------------------------------------------------------------------------------- Total assets $ 928,538,110 ========================================================================================= LIABILITIES: Payables -- Fund shares repurchased $ 1,039,728 Dividends 1,043,054 Due to bank 6,923,807 Due to affiliates 133,193 Accrued expenses 78,235 ----------------------------------------------------------------------------------------- Total liabilities $ 9,218,017 ========================================================================================= NET ASSETS: Paid-in capital $ 980,187,887 Undistributed net investment income 6,422,302 Accumulated net realized loss on investments (127,708,713) Net unrealized gain on investments 60,418,617 ----------------------------------------------------------------------------------------- Total net assets $ 919,320,093 ========================================================================================= NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Class A (Based on $797,180,894/56,685,216 shares) $ 14.06 Class B (Based on $3,820,501/273,542 shares) $ 13.97 Class C (Based on $42,002,369/3,011,183 shares) $ 13.95 Class Y (Based on $76,316,329/5,440,492 shares) $ 14.03 MAXIMUM OFFERING PRICE: Class A ($14.06 (divided by) 95.5%) $ 14.72 ========================================================================================= The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 29 Statement of Operations (unaudited) For the Six Months Ended 6/30/12 INVESTMENT INCOME: Interest $23,414,626 ----------------------------------------------------------------------------------------- Total investment income $ 23,414,626 ----------------------------------------------------------------------------------------- EXPENSES: Management fees $ 2,041,955 Transfer agent fees Class A 152,360 Class B 2,923 Class C 4,624 Class Y 1,237 Distribution fees Class A 977,337 Class B 20,593 Class C 199,409 Shareholder communication expense 179,181 Administrative reimbursements 128,802 Custodian fees 11,307 Registration fees 31,392 Professional fees 45,207 Fees and expenses of nonaffiliated trustees 17,756 Miscellaneous 21,504 ----------------------------------------------------------------------------------------- Total expenses $ 3,835,587 Less fees waived and expenses reimbursed by Pioneer Investment Management, Inc. $ (79,646) ----------------------------------------------------------------------------------------- Net expenses $ 3,755,941 ----------------------------------------------------------------------------------------- Net investment income $19,658,685 ----------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS: Net realized gain on Investments $ 920,697 ----------------------------------------------------------------------------------------- Change in net unrealized gain on Investments $40,535,674 ----------------------------------------------------------------------------------------- Net gain on investments $41,456,371 ----------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $61,115,056 ========================================================================================= The accompanying notes are an integral part of these financial statements. 30 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 Statements of Changes in Net Assets Six Months Ended 6/30/12 Year Ended (Unaudited) 12/31/11 --------------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income $ 19,658,685 $ 39,730,631 Net realized gain (loss) on investments 920,697 (17,705,612) Change in net unrealized gain (loss) on investments 40,535,674 69,621,476 --------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 61,115,056 $ 91,646,495 --------------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Net investment income: Class A ($0.28 and $0.59 per share, respectively) $(15,714,838) $ (33,936,017) Class B ($0.21 and $0.48 per share, respectively) (64,200) (205,660) Class C ($0.22 and $0.49 per share, respectively) (650,193) (1,307,520) Class Y ($0.29 and $0.63 per share, respectively) (1,517,370) (3,220,838) --------------------------------------------------------------------------------------------------- Total distributions to shareowner $(17,946,601) $ (38,670,035) --------------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sale or exchange of shares $ 63,392,660 $ 123,935,441 Reinvestment of distributions 12,514,585 26,335,652 Cost of shares repurchased (75,140,156) (200,773,983) --------------------------------------------------------------------------------------------------- Net increase in net assets resulting from Fund share transactions $ 767,089 $ (50,502,890) --------------------------------------------------------------------------------------------------- Net increase in net assets $ 43,935,544 $ 2,473,570 NET ASSETS: Beginning of period 875,384,549 872,910,979 --------------------------------------------------------------------------------------------------- End of period $919,320,093 $ 875,384,549 =================================================================================================== Undistributed net investment income $ 6,422,302 $ 4,710,218 =================================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 31 Statements of Changes in Net Assets (continued) ----------------------------------------------------------------------------------------------- '12 Shares '12 Amount (Unaudited) (Unaudited) '11 Shares '11 Amount ----------------------------------------------------------------------------------------------- CLASS A Shares sold 3,220,478 $ 44,676,316 7,716,963 $ 100,511,196 Reinvestment of distributions 827,017 11,522,772 1,914,655 24,592,119 Less shares repurchased (4,625,138) (64,055,473) (11,998,627) (153,811,651) ----------------------------------------------------------------------------------------------- Net decrease (577,643) $ (7,856,385) (2,367,009) $ (28,708,336) =============================================================================================== CLASS B Shares sold or exchanged 4,476 $ 61,547 31,101 $ 393,652 Reinvestment of distributions 3,638 50,309 13,290 168,365 Less shares repurchased (62,599) (861,871) (371,018) (4,637,405) ----------------------------------------------------------------------------------------------- Net decrease (54,485) $ (750,015) (326,627) $ (4,075,388) =============================================================================================== CLASS C Shares sold 448,343 $ 6,167,017 715,343 $ 9,249,990 Reinvestment of distributions 33,475 462,641 70,687 900,254 Less shares repurchased (317,315) (4,355,450) (1,032,237) (12,922,370) ----------------------------------------------------------------------------------------------- Net increase (decrease) 164,503 $ 2,274,208 (246,207) $ (2,772,126) =============================================================================================== CLASS Y Shares sold 899,286 $ 12,487,780 1,066,581 $ 13,780,603 Reinvestment of distributions 34,430 478,863 52,541 674,914 Less shares repurchased (422,787) (5,867,362) (2,329,142) (29,402,557) ----------------------------------------------------------------------------------------------- Net increase (decrease) 510,929 $ 7,099,281 (1,210,020) $ (14,947,040) =============================================================================================== The accompanying notes are an integral part of these financial statements. 32 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 Financial Highlights ------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 6/30/12 Ended Ended Ended Ended Ended (Unaudited) 12/31/11 12/31/10 12/31/09 12/31/08 12/31/07 ------------------------------------------------------------------------------------------------------------------------------ Class A Net asset value, beginning of period $ 13.40 $ 12.56 $ 12.86 $ 10.90 $ 13.50 $ 14.11 ------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.30 $ 0.62 $ 0.57 $ 0.59 $ 0.60 $ 0.62 Net realized and unrealized gain (loss) on investments 0.64 0.82 (0.28) 1.99 (2.54) (0.42) ------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.94 $ 1.44 $ 0.29 $ 2.58 $ (1.94) $ 0.20 ------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income (0.28) (0.60) (0.59) (0.61) (0.59) (0.61) Net realized gain -- -- -- (0.01) (0.07) (0.20) ------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 0.66 $ 0.84 $ (0.30) $ 1.96 $ (2.60) $ (0.61) ------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 14.06 $ 13.40 $ 12.56 $ 12.86 $ 10.90 $ 13.50 ============================================================================================================================== Total return* 7.02% 11.73% 2.15% 24.01% (14.85)% 1.40% Ratio of net expenses to average net assets+ 0.82%** 0.82% 0.82% 0.82% 0.82% 0.82% Ratio of net investment income to average net assets+ 4.40%** 4.77% 4.55% 4.94% 4.66% 4.45% Portfolio turnover rate 24%** 14% 18% 18% 27% 18% Net assets, end of period (in thousands) $797,181 $767,290 $749,235 $479,599 $353,257 $451,219 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.84%** 0.87% 0.85% 0.88% 0.88% 0.85% Net investment income 4.38%** 4.72% 4.52% 4.88% 4.60% 4.42% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.82%** 0.82% 0.82% 0.82% 0.82% 0.82% Net investment income 4.40%** 4.77% 4.55% 4.94% 4.66% 4.45% ============================================================================================================================== * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized + Ratios assuming no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 33 Financial Highlights (continued) -------------------------------------------------------------------------------------------------------------------------- Six Months Ended Year Year Year Year Year 6/30/12 Ended Ended Ended Ended Ended (Unaudited) 12/31/11 12/31/10 12/31/09 12/31/08 12/31/07 -------------------------------------------------------------------------------------------------------------------------- Class B Net asset value, beginning of period $13.30 $12.48 $ 12.78 $10.83 $ 13.41 $ 14.03 -------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income $ 0.26 $ 0.55 $ 0.46 $ 0.50 $ 0.48 $ 0.48 Net realized and unrealized gain (loss) on investments 0.62 0.75 (0.29) 1.96 (2.52) (0.41) -------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 0.88 $ 1.30 $ 0.17 $ 2.46 $ (2.04) $ 0.07 -------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.21) (0.48) (0.47) (0.50) (0.47) (0.49) Net realized gain -- -- -- (0.01) (0.07) (0.20) -------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.67 $ 0.82 $ (0.30) $ 1.95 $ (2.58) $ (0.62) -------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $13.97 $13.30 $ 12.48 $12.78 $ 10.83 $ 13.41 ========================================================================================================================== Total return* 6.66% 10.63% 1.25% 22.97% (15.60)% 0.46% Ratio of net expenses to average net assets+ 1.72%** 1.72% 1.68% 1.71% 1.72% 1.72% Ratio of net investment income to average net assets+ 3.50%** 3.93% 3.68% 4.06% 3.76% 3.55% Portfolio turnover rate 24%** 14% 18% 18% 27% 18% Net assets, end of period (in thousands) $3,821 $4,364 $ 8,169 $5,838 $ 5,286 $ 6,737 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.75%** 1.74% 1.68% 1.71% 1.72% 1.78% Net investment income 3.47%** 3.90% 3.68% 4.06% 3.76% 3.49% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.72%** 1.72% 1.68% 1.71% 1.72% 1.72% Net investment income 3.50%** 3.93% 3.68% 4.06% 3.76% 3.55% ========================================================================================================================== * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized + Ratios assuming no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. 34 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 ----------------------------------------------------------------------------------------------------------------------------- Six Months Ended Year Year Year Year Year 6/30/12 Ended Ended Ended Ended Ended (Unaudited) 12/31/11 12/31/10 12/31/09 12/31/08 12/31/07 ----------------------------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of period $ 13.29 $ 12.46 $ 12.77 $ 10.83 $ 13.42 $ 14.02 ----------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income $ 0.24 $ 0.51 $ 0.47 $ 0.47 $ 0.45 $ 0.45 Net realized and unrealized gain (loss) on investments 0.64 0.81 (0.30) 1.98 (2.48) (0.35) ----------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 0.88 $ 1.32 $ 0.17 $ 2.45 $ (2.03) $ 0.10 ----------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.22) (0.49) (0.48) (0.50) (0.49) (0.50) Net realized gain -- -- -- (0.01) (0.07) (0.20) ----------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.66 $ 0.83 $ (0.31) $ 1.94 $ (2.59) $ (0.60) ----------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 13.95 $ 13.29 $ 12.46 $ 12.77 $ 10.83 $ 13.42 ============================================================================================================================= Total return* 6.66% 10.84% 1.26% 22.93% (15.56)% 0.67% Ratio of net expenses to average net assets+ 1.57%** 1.61% 1.60% 1.64% 1.65% 1.58% Ratio of net investment income to average net assets+ 3.65%** 3.98% 3.78% 4.08% 3.85% 3.66% Portfolio turnover rate 24%** 14% 18% 18% 27% 18% Net assets, end of period (in thousands) $42,002 $37,834 $38,548 $26,422 $15,157 $12,620 Ratios with no waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.57%** 1.61% 1.60% 1.64% 1.65% 1.58% Net investment income 3.65%** 3.98% 3.78% 4.08% 3.85% 3.66% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.57%** 1.61% 1.60% 1.64% 1.65% 1.58% Net investment income 3.65%** 3.98% 3.78% 4.08% 3.85% 3.66% ============================================================================================================================= * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized + Ratios assuming no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 35 Financial Highlights (continued) ----------------------------------------------------------------------------------------------------------------------------- Six Months Ended Year Year Year Year Year 6/30/12 Ended Ended Ended Ended Ended (Unaudited) 12/31/11 12/31/10 12/31/09 12/31/08 12/31/07 ----------------------------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 13.37 $ 12.53 $ 12.84 $ 10.89 $ 13.48 $ 14.09 ----------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income $ 0.31 $ 0.67 $ 0.58 $ 0.63 $ 0.62 $ 0.67 Net realized and unrealized gain (loss) on investments 0.64 0.80 (0.26) 1.96 (2.51) (0.44) ----------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 0.95 $ 1.47 $ 0.32 $ 2.59 $ (1.89) $ 0.23 ----------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.29) (0.63) (0.63) (0.63) (0.63) (0.64) Net realized gain -- -- -- (0.01) (0.07) (0.20) ----------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.66 $ 0.84 $ (0.31) $ 1.95 $ (2.59) $ (0.61) ----------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 14.03 $ 13.37 $ 12.53 $ 12.84 $ 10.89 $ 13.48 ============================================================================================================================= Total return* 7.18% 12.04% 2.34% 24.22% (14.56)% 1.67% Ratio of net expenses to average net assets+ 0.55%** 0.55% 0.55% 0.58% 0.58% 0.54% Ratio of net investment income to average net assets+ 4.67%** 5.04% 4.81% 5.17% 4.90% 4.73% Portfolio turnover rate 24%** 14% 18% 18% 27% 18% Net assets, end of period (in thousands) $76,316 $65,896 $76,959 $21,963 $18,571 $23,331 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.57%** 0.57% 0.55% 0.58% 0.58% 0.54% Net investment income 4.64%** 5.02% 4.80% 5.17% 4.90% 4.73% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.55%** 0.55% 0.55% 0.58% 0.58% 0.54% Net investment income 4.67%** 5.04% 4.81% 5.17% 4.90% 4.73% ============================================================================================================================= * 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. ** Annualized + 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 | Semiannual Report | 6/30/12 Notes to Financial Statements | 6/30/12 (unaudited) 1. Organization and Significant Accounting Policies Pioneer AMT-Free Municipal Fund (the Fund) is one of two 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 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. 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 gain or loss on investments during the reporting period. Actual results could differ from those estimates. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 37 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. Equity securities that have traded on an exchange are valued at the last sale price on the principal exchange where they are traded. Equity securities that have not traded on the date of valuation, or securities for which sale prices are not available, generally are valued using the mean between the last bid and asked prices. Short-term fixed income securities with remaining maturities of sixty days or less generally are valued at amortized cost. 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. Examples of a significant event might include political or economic news, corporate restructurings, natural disasters, terrorist activity or trading halts. Thus, the valuation of the Fund's securities may differ from exchange prices. At June 30, 2012, no securities were valued using fair value methods (other than 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. 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. 38 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 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 federal and state 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. The tax character of current year distribution payable will be determined at the end of the current taxable year. The tax character of distributions paid during the year ended December 31, 2011 was as follows: -------------------------------------------------------------------------------- 2011 -------------------------------------------------------------------------------- Distributions paid from: Ordinary income $ 649,938 Tax-exempt income 38,020,097 Long-term capital gain -- -------------------------------------------------------------------------------- Total $38,670,035 -------------------------------------------------------------------------------- The following shows the components of distributable earnings on a federal income tax basis at December 31, 2011: -------------------------------------------------------------------------------- 2011 -------------------------------------------------------------------------------- Distributable earnings: Undistributed tax-exempt income $ 2,924,512 Capital loss carryforward (118,209,800) Current year post-October loss deferred (10,419,610) Unrealized appreciation 21,668,649 -------------------------------------------------------------------------------- Total $(104,036,249) -------------------------------------------------------------------------------- The difference between book basis and tax basis appreciation is attributable to the tax treatment of premium and amortization. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 39 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 $34,343 in underwriting commissions on the sale of Class A shares six months ended June 30, 2012. 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. E. Risks 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. 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 six months ended June 30, 2012, the effective management fee (excluding waivers and/or assumption of expenses) was equivalent to 0.45% of the Fund's average daily net assets. 40 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 PIM has contractually agreed to limit ordinary operating expenses of the Fund to the extent required to reduce Fund expenses to 0.82%, 1.72%, 1.72% and 0.55% of the average daily net assets attributable to Class A, Class B, Class C and Class Y shares, respectively. Fees waived and expenses reimbursed during the six months ended June 30, 2012 are reflected on the Statement of Operations. These expense limitations are in effect through June 1, 2013. 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 $50,812 in management fees, administrative costs and certain other reimbursements payable to PIM at June 30, 2012. Effective March 5, 2012 PIM has retained Brown Brothers Harriman & Co. to provide certain sub-administration and accounting services to the Fund. 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 six months ended June 30, 2012, such out-of-pocket expenses by class of shares were as follows: -------------------------------------------------------------------------------- Shareholder Communications: -------------------------------------------------------------------------------- Class A $148,121 Class B 2,072 Class C 7,523 Class Y 21,465 -------------------------------------------------------------------------------- Total $179,181 -------------------------------------------------------------------------------- Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $62,345 in transfer agent fees and out-of-pocket reimbursements payable to PIMSS at June 30, 2012. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 41 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 $20,036 in distribution fees payable to PFD at June 30, 2012. 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 12 months of purchase. 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 six months ended June 30, 2012, CDSCs in the amount of $18,786 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 six months ended June 30, 2012, 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 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. The credit facility in effect until January 20, 2012 was in the amount of $165 million. 42 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 Under such facility, interest on borrowings was 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 credit facility in effect as of February 15, 2012 is in the amount of $215 million. Under such facility, depending on the type of loan, interest on borrowings is payable at LIBOR plus 0.90% on an annualized basis, or the Alternate Base Rate, which is the greater of (a) the facility's administrative agent's daily announced prime rate on the borrowing date, (b) 2% plus the Federal Funds Rate on the borrowing date and (c) 2% plus the overnight Euro dollar rate on the borrowing date. The Funds pay an annual commitment fee to participate in a credit facility. The commitment fee is allocated among participating Funds based on an allocation schedule set forth in the credit agreement. For the six months ended June 30, 2012, the Fund had no borrowings under a credit facility. Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 43 Trustees, Officers and Service Providers Trustees Officers Thomas J. Perna, Chairman John F. Cogan, Jr., President* David R. Bock Daniel K. Kingsbury, Executive Mary K. Bush Vice President John F. Cogan, Jr. Mark E. Bradley, Treasurer** Benjamin M. Friedman Christopher J. Kelley, Secretary Margaret B.W. Graham Daniel K. Kingsbury Marguerite A. Piret Stephen K. West Investment Adviser and Administrator Pioneer Investment Management, Inc. Custodian and Sub-Administrator Brown Brothers Harriman & Co. 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 us.pioneerinvestments.com. This information is also available on the Securities and Exchange Commission's web site at http://www.sec.gov. * Chief Executive Officer of the Funds ** Chief Financial and Accounting Officer of the Funds 44 Pioneer AMT-Free Municipal Fund | Semiannual Report | 6/30/12 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: us.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. [LOGO] PIONEER Investments(R) Pioneer Investment Management, Inc. 60 State Street Boston, MA 02109 us.pioneerinvestments.com Securities offered through Pioneer Funds Distributor, Inc. 60 State Street, Boston, MA 02109 Underwriter of Pioneer Mutual Funds, Member SIPC (C) 2012 Pioneer Investments 19451-06-0812 Pioneer Growth Opportunities Fund -------------------------------------------------------------------------------- Semiannual Report | June 30, 2012 -------------------------------------------------------------------------------- Ticker Symbols: Class A PGOFX Class B GOFBX Class C GOFCX Class R PGRRX Class Y GROYX [LOGO] PIONEER Investments(R) visit us: 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 24 Notes to Financial Statements 33 Trustees, Officers and Service Providers 42 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 1 President's Letter Dear Shareowner, The U.S. economy showed signs of an economic slowdown in the second quarter, reflecting higher savings by consumers and reduced spending by corporations, in large part due to concerns about both the U.S. outlook and the deteriorating situation in Europe. Some 40% - 45% of U.S. corporate earnings come from overseas, with a large portion of that from Europe. While large U.S. corporations generally remain in excellent financial health - cash, borrowing capacity, and margins are all strong - they are holding back on hiring and investments due to concerns about Europe, China, and U.S. regulations, fiscal policies, taxes, and politics. Many investors share those concerns, and are maintaining a cautious approach to the markets. Despite this tough backdrop, the markets had a surprisingly strong first half of 2012. The Standard & Poor's 500 Index returned 9.5% over the six months ended June 30, 2012. In the U.S. bond markets, interest rates generally declined, with riskier sectors faring the best. The broad bond market, as measured by the Barclays Capital Aggregate Bond Index, returned 2.4% during the same six-month period, while the high-yield bond market, as measured by the Bank of America Merrill Lynch High Yield Master II Index, returned 7.1%. Given the major macroeconomic and political issues facing the markets in the second half of the year, we certainly expect continuing volatility. But we also see some positive economic data that give us hope for better news in the second half of 2012. While the unemployment rate remains unacceptably high at over 8%, employment and incomes continue to trend upward. Lower oil prices have acted like an effective tax cut for consumers. Home construction, sales, and refinancings have increased, and auto sales are holding up as well. At Pioneer, we have long advocated the benefits of staying diversified* and investing for the long term. The strategy has generally performed well for many investors. 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. * Diversification does not assure a profit or protect against loss in a declining market. 2 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 Pioneer's investment professionals focus on finding good opportunities in both equity and bond markets using the same disciplined investment approach we have used since 1928. Our strategy is to identify undervalued individual securities with the greatest potential for success, carefully weighing risk against reward. Our teams of investment professionals continually monitor and analyze the relative valuations of different sectors and securities globally to help build portfolios that we believe can help you achieve your investment goals. 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 us.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 opinion 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 | Semiannual Report | 6/30/12 3 Portfolio Management Discussion | 6/30/12 In the following interview, Brian Stack, senior vice president and portfolio manager at Pioneer, discusses the factors that influenced the performance of Pioneer Growth Opportunities Fund during the six-month period ended June 30, 2012. Mr. Stack is responsible for the daily management of the Fund. Q How did the Fund perform during the six months ended June 30, 2012? A Pioneer Growth Opportunities Fund Class A shares returned 7.56% at net asset value during the six months ended June 30, 2012, while the Fund's benchmark, the Russell 2000 Growth Index (the Russell Index), returned 8.81%. During the same period, the average return of the 526 mutual funds in Lipper's Small Cap Growth Funds category was 8.12%. Q How would you describe your investment strategy in managing the Fund, and how did that strategy affect the Fund's performance during the six months ended June 30, 2012? A During the period, we continued to employ our "growth at a reasonable price" (GARP) discipline in managing the Fund. The GARP approach targets companies that we believe are attractively priced, with above-average growth potential, defensible business models, solid competitive positions, and innovative products or other growth drivers that can prevail, even in an uncertain economic environment. While the Fund underperformed the Russell Index and its peer group during the six-month period, we also recognize that the first half of 2012 was a difficult time for individual stock pickers. Many of the best performers during the period were stocks with higher valuations and strong price momentum. The market environment during the last six months was a challenging one for the Fund's investment strategy, which emphasizes higher-quality, attractively-valued companies that are sometimes out of favor with the market. Q What specific holdings helped the Fund's performance during the six months ended June 30, 2012? A Three of the Fund's holdings were taken over at a premium during the period. In health care, Catalyst Health Solutions merged with SXC Health Solutions, and the drug development company Inhibitex was acquired by Bristol-Myers Squibb. In addition, the restaurant operator PF Chang's was purchased by a private equity firm. We don't intentionally look for takeover 4 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 targets when we pick stocks for the Fund, but a natural result of our focus on undervalued growth companies is that the Fund has averaged about four to six takeovers per year throughout its history. The Fund's returns also benefited from owning several stocks that displayed robust performance during the period, on the strength of positive fundamental developments. The stock price of Amarin, a development-stage biopharmaceutical company, climbed from $7.49 to $14.46 during the period after successfully completing Phase III clinical testing for its key drug. The drug is expected to receive FDA approval later this year. Also in health care, the Fund's position in Conceptus returned more than 50% during the period, behind strong earnings and news of a strengthened management team. Our stock selection process also added value to Fund returns in the energy and industrials sectors. In energy, an emphasis on natural gas over oil stocks in the Fund benefited performance. Our enthusiasm for low-cost providers of natural gas, such as Cabot Oil & Gas, a strong performer, is based on our expectation that higher-cost producers will curtail drilling and production in the face of a low price for the commodity. Additionally, we expect that longer-term demand for natural gas will be boosted by the development of both liquefied natural gas infrastructure and gas-fired vehicles. In industrials, the Fund held a number of stocks that registered robust gains during the six-month period, including TransDigm, the aerospace component maker; On Assignment, the temporary help provider; and U.S. Airways. Q What types of investment decisions or individual holdings hurt the Fund's performance during the six months ended June 30, 2012? A The Fund's positioning in the information technology and financials sectors accounted for the majority of the underperformance relative to the Russell Index during the six-month period. The largest individual detractor from performance in the information technology sector was WebMD Health, which is the largest online provider of health information services. WebMD fell sharply during the period as advertising sales cycles lengthened in response to heightened regulatory review of online pharmaceuticals marketing. Additionally, OCZ Technology, which makes solid-state disk drives that are being adopted in place of hard disk drives, declined during the period after reporting a modest earnings shortfall. We eliminated WebMD from the Fund based on our belief that advertising revenues would remain under pressure. We remain optimistic about OCZ's prospects for the balance of 2012 and beyond, however, and the stock remains in the Fund's portfolio. Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 5 The Fund's benchmark-relative underperformance in the financials sector primarily reflected a lack of exposure to real estate investment trusts (REITs), which were among the market's best performers during the period, due in part to investors' thirst for yield. Q Broadly speaking, how was the Fund positioned as of June 30, 2012? A The Fund is positioned for a low-to-moderate economic growth environment. Keeping in mind that Fund's sector weights are a residual effect of our security selection process, information technology remained the portfolio's largest overweight relative to the Russell Index at the end of the six-month period. Financials and consumer staples remained the Fund's largest benchmark-relative underweights. Portfolio turnover was lower than average during the six months ended June 30, 2012, as we didn't make any wholesale shifts. Instead, we made incremental, stock-by-stock changes to the portfolio based on our bottom-up selection process. We believe the lower turnover reflects our confidence in the fundamentals and valuations of the stocks currently owned by the Fund. Q What is your outlook for the second half of 2012, and beyond? A As noted previously, the Fund is positioned for a low-to-moderate economic growth environment, but we remain optimistic on the long-term outlook for U.S. equities. We continue to be focused on identifying U.S.-centric, company-specific growth stories when adding securities to the Fund's portfolio, and we will continue to strive to generate long-term Fund outperformance through all market cycles. We believe that maintaining our GARP investment discipline - rather than trying to chase short-term performance trends - is the best way to accomplish that goal. 6 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 Please refer to the Schedule of Investments on pages 17-23 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. These risks may increase share price volatility. 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 opinion as of the date of this report. These opinions should not be relied upon for any other purposes. Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 7 Portfolio Summary | 6/30/12 Portfolio Diversification -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] U.S. Common Stocks 86.5% Exchange Traded Fund 1.1% Temporary Cash Investment 2.9% International Common Stocks 6.5% Depository Receipts for International Stocks 3.0% Sector Distribution -------------------------------------------------------------------------------- (As a percentage of equity holdings) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Health Care 26.2% Materials 4.0% Financials 4.3% Energy 7.6% Information Technology 26.0% Industrials 14.0% Consumer Discretionary 17.9% 10 Largest Holdings -------------------------------------------------------------------------------- (As a percentage of equity holdings)* 1. Amarin Corp Plc (A.D.R.) 2.25% -------------------------------------------------------------------------------- 2. Cabot Oil & Gas Corp. 2.04 -------------------------------------------------------------------------------- 3. Jazz Pharmaceuticals Plc 2.03 -------------------------------------------------------------------------------- 4. Spirit Aerosystems Holdings, Inc. 1.94 -------------------------------------------------------------------------------- 5. Salix Pharmaceuticals, Ltd. 1.88 -------------------------------------------------------------------------------- 6. Cinemark Holdings, Inc. 1.85 -------------------------------------------------------------------------------- 7. Cubist Pharmaceuticals, Inc. 1.67 -------------------------------------------------------------------------------- 8. WR Grace & Co. 1.55 -------------------------------------------------------------------------------- 9. Conceptus, Inc. 1.45 -------------------------------------------------------------------------------- 10. Gartner, Inc. 1.45 -------------------------------------------------------------------------------- * 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 | Semiannual Report | 6/30/12 Prices and Distributions | 6/30/12 Net Asset Value per Share -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 6/30/12 12/31/11 -------------------------------------------------------------------------------- A $28.60 $26.59 -------------------------------------------------------------------------------- B $23.83 $22.31 -------------------------------------------------------------------------------- C $24.28 $22.68 -------------------------------------------------------------------------------- R $28.37 $26.43 -------------------------------------------------------------------------------- Y $29.71 $27.55 -------------------------------------------------------------------------------- Distributions per Share: 1/1/12-6/30/12 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains -------------------------------------------------------------------------------- A $ -- $ -- $ -- -------------------------------------------------------------------------------- B $ -- $ -- $ -- -------------------------------------------------------------------------------- C $ -- $ -- $ -- -------------------------------------------------------------------------------- R $ -- $ -- $ -- -------------------------------------------------------------------------------- Y $ -- $ -- $ -- -------------------------------------------------------------------------------- Index Definition -------------------------------------------------------------------------------- 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 | Semiannual Report | 6/30/12 9 Performance Update | 6/30/12 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 June 30, 2012) -------------------------------------------------------------------------------- Net Asset Public Offering Period Value (NAV) Price (POP) -------------------------------------------------------------------------------- 10 Years 5.01% 4.39% 5 Years 0.78 -0.41 1 Year -5.01 -10.48 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated May 1, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 1.26% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Growth Russell 2000 Opportunities fund Growth Index 6/30/2002 $ 9,425 $ 10,000 6/30/2003 $ 8,419 $ 10,069 6/30/2004 $ 11,154 $ 13,245 6/30/2005 $ 12,401 $ 13,813 6/30/2006 $ 13,052 $ 15,827 6/30/2007 $ 14,781 $ 18,491 6/30/2008 $ 11,958 $ 16,488 6/30/2009 $ 10,217 $ 12,391 6/30/2010 $ 11,856 $ 14,617 6/30/2011 $ 16,175 $ 20,975 6/30/2012 $ 15,364 $ 20,406 Call 1-800-225-6292 or visit us.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 acquired the assets and liabilities 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 | Semiannual Report | 6/30/12 Performance Update | 6/30/12 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 June 30, 2012) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 3.84% 3.84% 5 Years -0.56 -0.56 1 Year -6.26 -10.00 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated May 1, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 2.49% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Growth Russell 2000 Opportunities fund Growth Index 6/30/2002 $ 10,000 $ 10,000 6/30/2003 $ 8,865 $ 10,069 6/30/2004 $ 11,656 $ 13,245 6/30/2005 $ 12,856 $ 13,813 6/30/2006 $ 13,386 $ 15,827 6/30/2007 $ 14,991 $ 18,491 6/30/2008 $ 11,962 $ 16,488 6/30/2009 $ 10,068 $ 12,391 6/30/2010 $ 11,536 $ 14,617 6/30/2011 $ 15,548 $ 20,975 6/30/2012 $ 14,576 $ 20,406 Call 1-800-225-6292 or visit us.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. For more complete information, please see the prospectus. 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 acquired the assets and liabilities 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 | Semiannual Report | 6/30/12 11 Performance Update | 6/30/12 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 June 30, 2012) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 4.02% 4.02% 5 Years -0.32 -0.32 1 Year -5.89 -5.89 Expense Ratio (Per prospectus dated May 1, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 2.13% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Growth Russell 2000 Opportunities fund Growth Index 6/30/2002 $ 10,000 $ 10,000 6/30/2003 $ 8,869 $ 10,069 6/30/2004 $ 11,661 $ 13,245 6/30/2005 $ 12,872 $ 13,813 6/30/2006 $ 13,449 $ 15,827 6/30/2007 $ 15,073 $ 18,491 6/30/2008 $ 12,047 $ 16,488 6/30/2009 $ 10,148 $ 12,391 6/30/2010 $ 11,657 $ 14,617 6/30/2011 $ 15,763 $ 20,975 6/30/2012 $ 14,834 $ 20,406 Call 1-800-225-6292 or visit us.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 acquired the assets and liabilities 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 | Semiannual Report | 6/30/12 Performance Update | 6/30/12 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 June 30, 2012) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 4.21% 4.21% 5 Years -0.13 -0.13 1 Year -5.34 -5.34 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated May 1, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 1.57% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Growth Russell 2000 Opportunities fund Growth Index 6/30/2002 $ 10,000 $ 10,000 6/30/2003 $ 8,889 $ 10,069 6/30/2004 $ 11,717 $ 13,245 6/30/2005 $ 12,963 $ 13,813 6/30/2006 $ 13,575 $ 15,827 6/30/2007 $ 15,200 $ 18,491 6/30/2008 $ 12,078 $ 16,488 6/30/2009 $ 10,143 $ 12,391 6/30/2010 $ 11,723 $ 14,617 6/30/2011 $ 15,956 $ 20,975 6/30/2012 $ 15,104 $ 20,406 Call 1-800-225-6292 or visit us.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 acquired the assets and liabilities 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 (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 shown for periods from December 10, 2004, to the inception of Class R shares on August 3, 2009, is based on the performance of 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 | Semiannual Report | 6/30/12 13 Performance Update | 6/30/12 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 June 30, 2012) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 5.38% 5.38% 5 Years 1.30 1.30 1 Year -4.53 -4.53 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated May 1, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 0.75% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $5 Million Investment Pioneer Growth Russell 2000 Opportunities fund Growth Index 6/30/2002 $ 5,000,000 $ 5,000,000 6/30/2003 $ 4,466,368 $ 5,034,366 6/30/2004 $ 5,917,040 $ 6,622,598 6/30/2005 $ 6,578,475 $ 6,906,458 6/30/2006 $ 6,948,431 $ 7,913,632 6/30/2007 $ 7,918,263 $ 9,245,282 6/30/2008 $ 6,433,821 $ 8,243,856 6/30/2009 $ 5,529,189 $ 6,195,503 6/30/2010 $ 6,450,246 $ 7,308,394 6/30/2011 $ 8,846,702 $ 10,487,287 6/30/2012 $ 8,445,871 $ 10,202,977 Call 1-800-225-6292 or visit us.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 acquired the assets and liabilities 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 (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 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 | Semiannual Report | 6/30/12 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 (division) $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 January 1, 2012, through June 30, 2012. -------------------------------------------------------------------------------- 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 1/1/12 -------------------------------------------------------------------------------- Ending Account Value $1,075.60 $1,068.10 $1,070.60 $1,073.40 $1,078.40 (after expenses) on 6/30/12 -------------------------------------------------------------------------------- Expenses Paid $6.50 $13.73 $10.86 $8.56 $3.88 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 1.26%, 2.67%, 2.11%, 1.66% and 0.75% for Class A, Class B, Class C, Class R, and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 182/366 (to reflect the one-half year period). Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 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 January 1, 2012, through June 30, 2012. -------------------------------------------------------------------------------- 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 1/1/12 -------------------------------------------------------------------------------- Ending Account Value $1,018.60 $1,011.59 $1,014.37 $1,016.61 $1,021.13 (after expenses) on 6/30/12 -------------------------------------------------------------------------------- Expenses Paid $6.32 $13.35 $10.57 $8.32 $3.77 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 1.26%, 2.67%, 2.11%, 1.66% and 0.75% for Class A, Class B, Class C, Class R, and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 182/366 (to reflect the one-half year period). 16 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 Schedule of Investments | 6/30/12 (unaudited) ------------------------------------------------------------------------------- Shares Value ------------------------------------------------------------------------------- COMMON STOCKS -- 95.2% ENERGY -- 7.4% Oil & Gas Exploration & Production -- 6.9% 279,043 Cabot Oil & Gas Corp. $ 10,994,294 356,670 Comstock Resources, Inc.* 5,856,521 524,000 EXCO Resources, Inc.* 3,977,160 395,800 McMoRan Exploration Co.* 5,014,786 140,500 Oasis Petroleum, Inc.* 3,397,290 66,529 Range Resources Corp. 4,116,149 53,600 Rosetta Resources, Inc.* 1,963,904 515,900 Triangle Petroleum Corp.* 2,878,722 ----------------- $ 38,198,826 ------------------------------------------------------------------------------- Oil & Gas Storage & Transportation -- 0.5% 76,826 Golar LNG, Ltd. $ 2,896,340 ----------------- Total Energy $ 41,095,166 ------------------------------------------------------------------------------- MATERIALS -- 3.6% Specialty Chemicals -- 3.0% 523,000 Flotek Industries, Inc.* $ 4,884,820 360,900 GSE Holding, Inc.* 3,814,713 165,400 WR Grace & Co.* 8,344,430 ----------------- $ 17,043,963 ------------------------------------------------------------------------------- Steel -- 0.6% 103,200 Allegheny Technologies, Inc. $ 3,291,048 ----------------- Total Materials $ 20,335,011 ------------------------------------------------------------------------------- CAPITAL GOODS -- 5.4% Aerospace & Defense -- 3.5% 125,800 Hexcel Corp.* $ 3,244,382 438,000 Spirit Aerosystems Holdings, Inc.* 10,437,540 42,528 TransDigm Group, Inc.* 5,711,510 ----------------- $ 19,393,432 ------------------------------------------------------------------------------- Construction & Engineering -- 0.8% 189,900 KBR, Inc. $ 4,692,429 ------------------------------------------------------------------------------- Industrial Machinery -- 1.1% 89,600 Chart Industries, Inc.* $ 6,160,896 ----------------- Total Capital Goods $ 30,246,757 ------------------------------------------------------------------------------- COMMERCIAL SERVICES & SUPPLIES -- 5.5% Diversi3ed Support Services -- 1.7% 153,372 Copart, Inc.* $ 3,633,383 141,300 Mobile Mini, Inc.* 2,034,720 106,200 United Rentals, Inc.* 3,615,048 ----------------- $ 9,283,151 ------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 17 Schedule of Investments | 6/30/12 (unaudited) (continued) ------------------------------------------------------------------------------- Shares Value ------------------------------------------------------------------------------- Human Resource & Employment Services -- 2.0% 387,585 On Assignment, Inc.* $ 6,185,857 315,900 WageWorks, Inc.* 4,757,454 ----------------- $ 10,943,311 ------------------------------------------------------------------------------- Research & Consulting Services -- 1.8% 8,800 Acacia Research Corp.* $ 327,712 48,411 CoStar Group, Inc.* 3,930,973 420,075 RPX Corp.* 6,028,076 ----------------- $ 10,286,761 ----------------- Total Commercial Services & Supplies $ 30,513,223 ------------------------------------------------------------------------------- TRANSPORTATION -- 2.6% Air Freight & Logistics -- 0.3% 83,400 XPO Logistics, Inc.* $ 1,401,120 ------------------------------------------------------------------------------- Airlines -- 2.3% 106,920 Allegiant Travel Co.* $ 7,450,186 424,900 US Airways Group, Inc.* 5,663,917 ----------------- $ 13,114,103 ----------------- Total Transportation $ 14,515,223 ------------------------------------------------------------------------------- AUTOMOBILES & COMPONENTS -- 0.9% Auto Parts & Equipment -- 0.9% 229,300 Gentex Corp. $ 4,785,491 ----------------- Total Automobiles & Components $ 4,785,491 ------------------------------------------------------------------------------- CONSUMER DURABLES & APPAREL -- 6.1% Household Appliances -- 0.8% 115,000 SodaStream International, Ltd.* $ 4,711,550 ------------------------------------------------------------------------------- Housewares & Specialties -- 0.7% 72,800 Tupperware Brands Corp. $ 3,986,528 ------------------------------------------------------------------------------- Leisure Products -- 0.6% 319,400 LeapFrog Enterprises, Inc.* $ 3,277,044 ------------------------------------------------------------------------------- Apparel, Accessories & Luxury Goods -- 3.3% 61,501 Carter's, Inc.* $ 3,234,953 156,000 G-III Apparel Group, Ltd.* 3,695,640 231,700 Hanesbrands, Inc.* 6,425,041 168,000 True Religion Apparel, Inc. 4,868,640 ----------------- $ 18,224,274 ------------------------------------------------------------------------------- Footwear -- 0.7% 252,256 Crocs, Inc.* $ 4,073,934 ----------------- Total Consumer Durables & Apparel $ 34,273,330 ------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 18 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 ------------------------------------------------------------------------------- Shares Value ------------------------------------------------------------------------------- CONSUMER SERVICES -- 2.9% Casinos & Gaming -- 1.0% 637,300 Scientific Games Corp.* $ 5,448,915 ------------------------------------------------------------------------------- Restaurants -- 0.9% 383,600 Caribou Coffee Co., Inc.* $ 4,952,276 ------------------------------------------------------------------------------- Education Services -- 1.0% 275,463 Grand Canyon Education, Inc.* $ 5,768,195 ----------------- Total Consumer Services $ 16,169,386 ------------------------------------------------------------------------------- MEDIA -- 2.5% Movies & Entertainment -- 2.5% 436,519 Cinemark Holdings, Inc. $ 9,974,459 153,900 Imax Corp.* 3,698,217 ----------------- $ 13,672,676 ----------------- Total Media $ 13,672,676 ------------------------------------------------------------------------------- RETAILING -- 4.9% Apparel Retail -- 3.2% 359,000 Express, Inc.* $ 6,523,030 119,900 Francesca's Holdings Corp.* 3,238,499 535,300 Hot Topic, Inc.* 5,187,057 116,300 Urban Outfitters, Inc.* 3,208,717 ----------------- $ 18,157,303 ------------------------------------------------------------------------------- Specialty Stores -- 1.1% 109,400 Vitamin Shoppe, Inc.* $ 6,009,342 ------------------------------------------------------------------------------- Homefurnishing Retail -- 0.6% 112,500 Mattress Firm Holding Corp.* $ 3,409,875 ----------------- Total Retailing $ 27,576,520 ------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 11.1% Health Care Equipment -- 5.6% 189,253 ABIOMED, Inc.* $ 4,318,753 394,825 Conceptus, Inc.* 7,825,432 56,034 HeartWare International, Inc.* 4,975,819 301,100 Insulet Corp.* 6,434,507 209,900 Masimo Corp.* 4,697,562 95,900 Volcano Corp.* 2,747,535 ----------------- $ 30,999,608 ------------------------------------------------------------------------------- Health Care Supplies -- 3.4% 161,000 Align Technology, Inc.* $ 5,387,060 417,800 Endologix, Inc.* 6,450,832 454,200 Quidel Corp.* 7,121,856 ----------------- $ 18,959,748 ------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 19 Schedule of Investments | 6/30/12 (unaudited) (continued) ------------------------------------------------------------------------------- Shares Value ------------------------------------------------------------------------------- Health Care Services -- 1.2% 71,600 Catalyst Health Solutions, Inc.* $ 6,690,304 ------------------------------------------------------------------------------- Health Care Facilities -- 0.4% 578,186 LCA-Vision, Inc.* $ 2,486,200 ------------------------------------------------------------------------------- Health Care Technology -- 0.5% 175,900 Greenway Medical Technologies, Inc.,* $ 2,868,929 ----------------- Total Health Care Equipment & Services $ 62,004,789 ------------------------------------------------------------------------------- PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 14.1% Biotechnology -- 7.3% 397,449 Alkermes Plc* $ 6,744,710 837,800 Amarin Corp Plc (A.D.R.)* 12,114,589 237,400 Cubist Pharmaceuticals, Inc.* 8,999,834 369,200 Exact Sciences Corp.* 3,957,824 304,570 Neurocrine Biosciences, Inc.* 2,409,149 752,700 NPS Pharmaceuticals, Inc.* 6,480,747 ----------------- $ 40,706,853 ------------------------------------------------------------------------------- Pharmaceuticals -- 6.8% 271,000 Auxilium Pharmaceuticals, Inc.* 7,287,190 242,905 Jazz Pharmaceuticals Plc* 10,933,154 288,100 Optimer Pharmaceuticals, Inc.* 4,471,312 99,700 Questcor Pharmaceuticals, Inc.* 5,308,028 185,900 Salix Pharmaceuticals, Ltd.* 10,120,396 ----------------- $ 38,120,080 ----------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 78,826,933 ------------------------------------------------------------------------------- BANKS -- 0.9% Regional Banks -- 0.9% 82,500 Signature Bank Corp.* $ 5,030,025 ----------------- Total Banks $ 5,030,025 ------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 1.6% Specialized Finance -- 1.0% 24,500 MarketAxess Holdings, Inc. $ 652,680 134,400 MSCI, Inc.* 4,572,288 ----------------- $ 5,224,968 ------------------------------------------------------------------------------- Consumer Finance -- 0.6% 147,798 Ezcorp, Inc.* $ 3,467,341 ----------------- Total Diversi3ed Financials $ 8,692,309 ------------------------------------------------------------------------------- Real Estate -- 0.7% Mortgage REIT's -- 0.7% 386,600 CreXus Investment Corp. $ 3,931,722 ----------------- Total Real Estate $ 3,931,722 ------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 20 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 ------------------------------------------------------------------------------- Shares Value ------------------------------------------------------------------------------- SOFTWARE & SERVICES -- 14.9% Internet Software & Services -- 3.8% 196,400 Brightcove, Inc.* $ 2,995,100 201,300 ExactTarget, Inc.* 4,400,418 418,000 SciQuest, Inc.* 7,507,280 568,400 Velti Plc* 3,694,600 142,218 Vocus, Inc.* 2,645,255 ----------------- $ 21,242,653 ------------------------------------------------------------------------------- IT Consulting & Other Services -- 3.6% 180,900 Gartner, Inc.* $ 7,787,745 187,983 InterXion Holding NV* 3,404,372 521,400 Sapient Corp. 5,250,498 284,300 Virtusa Corp.* 3,795,405 ----------------- $ 20,238,020 ------------------------------------------------------------------------------- Data Processing & Outsourced Services -- 1.8% 163,600 VeriFone Systems, Inc.* $ 5,413,524 468,100 WNS Holdings, Ltd. (A.D.R.)* 4,554,613 ----------------- $ 9,968,137 ------------------------------------------------------------------------------- Application Software -- 4.7% 198,333 Aspen Technology, Inc.* $ 4,591,409 278,000 RealPage, Inc.* 6,438,480 159,400 SS&C Technologies Holdings, Inc.* 3,985,000 342,140 Tangoe, Inc.* 7,291,003 43,233 Ultimate Software Group, Inc.* 3,852,925 ----------------- $ 26,158,817 ------------------------------------------------------------------------------- Systems Software -- 1.0% 170,940 Fortinet, Inc.* $ 3,969,227 83,800 Rovi Corp.* 1,644,156 ----------------- $ 5,613,383 ----------------- Total Software & Services $ 83,221,010 ------------------------------------------------------------------------------- TECHNOLOGY HARDWARE & EQUIPMENT -- 5.7% Communications Equipment -- 3.5% 369,500 Finisar Corp.* $ 5,527,720 217,200 Procera Networks, Inc.* 5,280,132 282,900 Riverbed Technology, Inc.* 4,568,835 941,300 ShoreTel, Inc.* 4,122,894 ----------------- $ 19,499,581 ------------------------------------------------------------------------------- Computer Storage & Peripherals -- 1.2% 1,233,219 OCZ Technology Group, Inc.* $ 6,536,061 ------------------------------------------------------------------------------- Technology Distributors -- 1.0% 166,306 SYNNEX Corp.* $ 5,735,894 ----------------- Total Technology Hardware & Equipment $ 31,771,536 ------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 21 Schedule of Investments | 6/30/12 (unaudited) (continued) ------------------------------------------------------------------------------- Shares Value ------------------------------------------------------------------------------- SEMICONDUCTORS & SEMICONDUCTOR EQUIPMENT -- 4.4% Semiconductor Equipment -- 0.7% 275,193 Nanometrics, Inc.* $ 4,226,964 ------------------------------------------------------------------------------- Semiconductors -- 3.7% 1,145,200 Entropic Communications, Inc.* $ 6,458,928 295,600 Integrated Device Technology, Inc.* 1,661,272 859,000 Lattice Semiconductor Corp.* 3,238,430 369,000 MIPS Technologies, Inc.* 2,461,230 277,300 Semtech Corp.* 6,743,936 ----------------- $ 20,563,796 ----------------- Total Semiconductors & Semiconductor Equipment $ 24,790,760 ------------------------------------------------------------------------------- TOTAL COMMON STOCKS (Cost $452,138,187) $ 531,451,867 ------------------------------------------------------------------------------- MUTUAL FUND -- 1.0% DIVERSIFIED FINANCIALS -- 1.0% Multi-Sector Holdings -- 1.0% 60,451 iShares Russell 2000 Growth Index Fund $ 5,529,453 ----------------- Total Diversi3ed Financials $ 5,529,453 ------------------------------------------------------------------------------- TOTAL MUTUAL FUND (Cost $5,267,135) $ 5,529,453 ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Principal Amount ($) ------------------------------------------------------------------------------- TEMPORARY CASH INVESTMENTS -- 2.9% Repurchase Agreements -- 2.9% 8,100,000 Deutsche Bank AG, 0.2%, dated 6/29/12, repurchase price of $8,100,000 plus accrued interest on 7/2/12 collateralized by the following: $247,596 U.S. Treasury Bond, 2.0-3.375%, 11/15/26-4/15/32 $8,014,404 U.S. Treasury Strip, 0.0-2.625%, 8/5/12-2/15/42 $ 8,100,000 8,100,000 JPMorgan, Inc., 0.18%, dated 6/29/12, repurchase price of $8,100,000 plus accrued interest on 7/2/12 collateralized by $8,262,126 Federal National Mortgage Association (ARM), 1.755-5.97%, 3/1/34-1/1/42 8,100,000 ----------------- $ 16,200,000 ------------------------------------------------------------------------------- TOTAL TEMPORARY CASH INVESTMENTS (Cost $16,200,000) $ 16,200,000 ------------------------------------------------------------------------------- TOTAL INVESTMENT IN SECURITIES -- 99.1% (Cost $473,635,436) (a) $ 553,181,320 =============================================================================== The accompanying notes are an integral part of these financial statements. 22 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 -------------------------------------------------------------------------------- Principal Amount ($) Value -------------------------------------------------------------------------------- WRITTEN OPTION -- (0.0) (256) Auxilium Pharmaceuticals, Inc. $ (85,760) -------------------------------------------------------------------------------- TOTAL WRITTEN OPTIONS (Premiums received $30,114) $ (85,760) -------------------------------------------------------------------------------- OTHER ASSETS & LIABILITIES -- 0.9% $ 5,296,512 ================================================================================ TOTAL NET ASSETS -- 100.0% $ 558,392,072 ================================================================================ * Non-income producing security. REIT's Real Estate Investment Trust. (A.D.R.) American Depositary Receipts. (a) At June 30, 2012, the net unrealized gain on investments based on cost for federal Income tax purposes of $476,406,985 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $101,984,711 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (25,210,376) ------------- Net unrealized gain $ 76,774,335 ============= Purchases and sales of securities (excluding temporary cash investments) for the six months ended June 30, 2012 aggregated $326,130,982 and $371,678,568, 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. 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, fixed income securities and senior loans as Level 2 and securities valued using fair value methods (other than prices supplied by independent pricing services) are categorized as Level 3. See Notes to Financial Statements -- Note 1A. The following is a summary of the inputs used as of June 30, 2012, in valuing the Fund's assets: ---------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total ---------------------------------------------------------------------------------- Common Stocks $531,451,867 $16,200,000 $ -- $547,651,867 Mutual Funds $ 5,529,453 $ -- $ -- $ 5,529,453 ---------------------------------------------------------------------------------- Total $536,981,320 $16,200,000 $ -- $553,181,320 ================================================================================== Other Financial Instruments* $ (85,760) $ -- $ -- $ (85,760) ================================================================================== * Other financial instruments include written options. The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 23 Statement of Assets and Liabilities | 6/30/12 (unaudited) ASSETS: Investment in securities (cost $473,635,436) $ 553,181,320 Cash 2,310,531 Receivables -- Investment securities sold 4,838,448 Fund shares sold 64,756 Dividends 166,526 Other 46,709 ------------------------------------------------------------------------------- Total assets $ 560,608,290 =============================================================================== LIABILITIES: Payables -- Investment securities purchased $ 1,250,076 Fund shares repurchased 582,048 Due to affiliates 226,648 Open option contracts written (premiums received $30,114) 85,760 Accrued expenses 71,686 ------------------------------------------------------------------------------- Total liabilities $ 2,216,218 =============================================================================== NET ASSETS: Paid-in capital $ 583,466,595 Accumulated net investment loss (2,941,355) Accumulated net realized loss on investments and options contracts (101,623,406) Net unrealized gain on investments 79,545,884 Net unrealized loss on written options (55,646) ------------------------------------------------------------------------------- Total net assets $ 558,392,072 =============================================================================== NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Class A (based on $454,233,549/15,883,486 shares) $ 28.60 Class B (based on $13,563,398/569,262 shares) $ 23.83 Class C (based on $41,887,815/1,725,025 shares) $ 24.28 Class R (based on $9,131,752/321,927 shares) $ 28.37 Class Y (based on $39,575,558/1,332,241 shares) $ 29.71 MAXIMUM OFFERING PRICE: Class A (28.60 (division) 94.25%) $ 30.34 =============================================================================== The accompanying notes are an integral part of these financial statements. 24 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 Statement of Operations (unaudited) For the Six Months Ended 6/30/12 INVESTMENT INCOME: Dividends $ 874,971 Interest 11,558 Income from securities loaned, net 169 ------------------------------------------------------------------------------------- Total investment income $ 886,698 ===================================================================================== EXPENSES: Management fees $ 1,860,682 Transfer agent fees and expenses Class A 418,380 Class B 55,512 Class C 31,436 Class R 2,141 Class Y 1,310 Distribution fees Class A 579,811 Class B 78,197 Class C 214,301 Class R 23,352 Shareholder communications expense 351,381 Administrative reimbursements 82,254 Custodian fees 17,161 Registration fees 33,167 Professional fees 38,208 Printing expense 6,869 Fees and expenses of nonaffiliated trustees 9,582 Miscellaneous 24,309 ------------------------------------------------------------------------------------- Total expenses $ 3,828,053 ------------------------------------------------------------------------------------- Net expenses $ 3,828,053 ------------------------------------------------------------------------------------- Net investment loss $ (2,941,355) ------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS AND OPTIONS CONTRACTS: Net realized gain on: Investments $ 20,220,266 Class Actions 787 Written options closed/expired 301,961 $ 20,523,014 ------------------------------------------------------------------------------------- Change in net unrealized gain (loss) on: Investments $ 23,729,673 Written options (97,696) $ 23,631,977 ------------------------------------------------------------------------------------- Net gain on investments and written options $ 44,154,991 ------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 41,213,636 ===================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 25 Statements of Changes in Net Assets ------------------------------------------------------------------------------------ Six Months Ended 6/30/12 Year Ended (Unaudited) 12/30/11 ------------------------------------------------------------------------------------ FROM OPERATIONS: Net investment loss $ (2,941,355) $ (6,342,457) Net realized gain on investments, class actions and written options 20,523,014 78,782,849 Change in net unrealized gain (loss) on investments and written options 23,631,977 (86,311,577) ------------------------------------------------------------------------------------ Net increase (decrease) in net assets resulting from operations $ 41,213,636 $ (13,871,185) ------------------------------------------------------------------------------------ FROM FUND SHARE TRANSACTIONS: Net proceeds from sale or exchange of shares $ 18,859,658 $ 52,812,803 Cost of shares repurchased (50,909,005) (133,580,761) ------------------------------------------------------------------------------------ Net decrease in net assets resulting from Fund share transactions $ (32,049,347) $ (80,767,958) ------------------------------------------------------------------------------------ Net increase (decrease) in net assets 9,164,289 (94,639,143) NET ASSETS: Beginning of period 549,227,783 643,866,926 ------------------------------------------------------------------------------------ End of period $ 558,392,072 $ 549,227,783 ==================================================================================== Accumulated net investment loss $ (2,941,355) $ -- ==================================================================================== The accompanying notes are an integral part of these financial statements. 26 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 ------------------------------------------------------------------------------------------------ '12 Shares '12 Amount (Unaudited) (Unaudited) '11 Shares '11 Amount ------------------------------------------------------------------------------------------------ CLASS A Shares sold 447,038 $ 7,575,737 1,257,632 $ 35,074,021 Less shares repurchased (1,207,114) (16,154,826) (3,157,647) (87,102,644) ------------------------------------------------------------------------------------------------ Net decrease (760,076) $ (8,579,089) (1,900,015) $ (52,028,623) ================================================================================================ CLASS B Shares sold or exchanged 22,219 $ 1,006,213 74,049 $ 1,734,440 Less shares repurchased (211,297) (2,907,371) (543,924) (12,672,154) ------------------------------------------------------------------------------------------------ Net decrease (189,078) $ (1,901,158) (469,875) $ (10,937,714) ================================================================================================ CLASS C Shares sold 112,851 $ 1,580,432 260,737 $ 6,040,826 Less shares repurchased (215,762) (4,219,894) (530,537) (12,590,565) ------------------------------------------------------------------------------------------------ Net decrease (102,911) $ (2,639,462) (269,800) $ (6,549,739) ================================================================================================ CLASS R Shares sold 42,354 $ 7,995,681 211,063 $ 5,754,560 Less shares repurchased (62,234) (23,017,844) (261,747) (7,128,539) ------------------------------------------------------------------------------------------------ Net decrease (19,880) $ (15,022,163) (50,684) $ (1,373,979) ================================================================================================ CLASS Y Shares sold 46,152 $ 701,595 148,487 $ 4,208,956 Less shares repurchased (138,606) (4,609,070) (484,567) (14,086,859) ------------------------------------------------------------------------------------------------ Net decrease (92,454) $ (3,907,475) (336,080) $ (9,877,903) ================================================================================================ The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 27 Financial Highlights ---------------------------------------------------------------------------------------------------------------------------------- Six Months Ended Year Year Year Year Year 6/30/12 Ended Ended Ended Ended Ended (Unaudited) 12/31/11 12/31/10 12/31/09 12/31/08 12/31/07 Class A Net asset value, beginning of period $ 26.59 $ 27.28 $ 22.81 $ 15.95 $ 25.24 $ 28.81 ---------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations: Net investment loss $ (0.14) $ (0.28) $ (0.22) $ (0.07) $ (0.07) $ (0.20) Net realized and unrealized gain (loss) on investments 2.15 (0.41) 4.69 6.93 (8.91) (1.01) ---------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 2.01 $ (0.69) $ 4.47 $ 6.86 $ (8.98) $ (1.21) ---------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net realized gain -- -- -- -- (0.31) (2.36) ---------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 2.01 $ (0.69) $ 4.47 $ 6.86 $ (9.29) $ (3.57) ---------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 28.60 $ 26.59 $ 27.28 $ 22.81 $ 15.95 $ 25.24 ================================================================================================================================== Total return* 7.56% (2.53)% 19.60% 43.01% (35.39)% (3.90)% Ratio of net expenses to average net assets+ 1.26%** 1.26% 1.29% 1.35% 1.28% 1.17% Ratio of net investment loss to average net assets+ (0.96)%** (0.95)% (0.86)% (0.53)% (0.29)% (0.65)% Portfolio turnover rate 116%** 112% 114% 140% 221% 104% Net assets, end of period (in thousands) $ 454,234 $442,574 $505,960 $463,880 $171,415 $339,870 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.26%** 1.26% 1.29% 1.35% 1.28% 1.17% Net investment loss (0.95)%** (0.95)% (0.86)% (0.53)% (0.29)% (0.65)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.26%** 1.26% 1.29% 1.35% 1.28% 1.16% Net investment loss (0.95)%** (0.95)% (0.86)% (0.53)% (0.28)% (0.64)% ================================================================================================================================== * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized. + Ratios with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. 28 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 Six Months Ended Year Year Year Year Year 6/30/12 Ended Ended Ended Ended Ended (Unaudited) 12/31/11 12/31/10 12/31/09 12/31/08 12/31/07 Class B Net asset value, beginning of period $ 22.31 $ 23.17 $ 19.60 $ 13.90 $ 22.42 $ 26.19 ----------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations: Net investment loss $ (0.33) $ (0.66) $ (0.55) $ (0.11) $ (0.39) $ (0.48) Net realized and unrealized gain (loss) on investments 1.85 (0.20) 4.12 5.81 (7.82) (0.93) ----------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.52 $ (0.86) $ 3.57 $ 5.70 $ (8.21) $ (1.41) ----------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net realized gain -- -- -- -- (0.31) (2.36) ----------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 1.52 $ (0.86) $ 3.57 $ 5.70 $ (8.52) $ (3.77) ----------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 23.83 $ 22.31 $ 23.17 $ 19.60 $ 13.90 $ 22.42 =================================================================================================================================== Total return* 6.81% (3.71)% 18.21% 41.01% (36.41)% (5.06)% Ratio of net expenses to average net assets+ 2.67%** 2.49% 2.45% 2.58% 2.84% 2.40% Ratio of net investment loss to average net assets+ (2.37)%** (2.19)% (2.03)% (1.54)% (1.86)% (1.88)% Portfolio turnover rate 116%** 112% 114% 140% 221% 104% Net assets, end of period (in thousands) $ 13,563 $ 16,919 $ 28,464 $ 40,989 $ 1,153 $ 2,385 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 2.67%** 2.49% 2.45% 2.58% 2.84% 2.40% Net investment loss (2.37)%** (2.19)% (2.03)% (1.54)% (1.86)% (1.88)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 2.67%** 2.49% 2.45% 2.58% 2.82% 2.37% Net investment loss (2.37)%** (2.19)% (2.03)% (1.54)% (1.84)% (1.85)% =================================================================================================================================== * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized. + Ratios with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 29 Financial Highlights (continued) ----------------------------------------------------------------------------------------------------------------------------------- Six Months Ended Year Year Year Year Year 6/30/12 Ended Ended Ended Ended Ended (Unaudited) 12/31/11 12/31/10 12/31/09 12/31/08 12/31/07 Class C Net asset value, beginning of period $ 22.68 $ 23.47 $ 19.81 $ 14.02 $ 22.57 $ 26.32 ----------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations: Net investment loss $ (0.22) $ (0.46) $ (0.42) $ (0.09) $ (0.27) $ (0.46) Net realized and unrealized gain (loss) on investments 1.82 (0.33) 4.08 5.88 (7.97) (0.93) ----------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.60 $ (0.79) $ 3.66 $ 5.79 $ (8.24) $ (1.38) ----------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net realized gain -- -- -- -- (0.31) (2.36) ----------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 1.60 $ (0.79) $ 3.66 $ 5.79 $ (8.55) $ (3.75) ----------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 24.28 $ 22.68 $ 23.47 $ 19.81 $ 14.02 $ 22.57 =================================================================================================================================== Total return* 7.06% (3.37)% 18.48% 41.30% (36.30)% (4.96)% Ratio of net expenses to average net assets+ 2.11%** 2.13% 2.26% 2.39% 2.65% 2.22% Ratio of net investment loss to average net assets+ (1.81)%** (1.82)% (1.83)% (1.33)% (1.64)% (1.70)% Portfolio turnover rate 116%** 112% 114% 140% 221% 104% Net assets, end of period (in thousands) $ 41,888 $ 41,448 $ 49,239 $ 49,845 $ 696 $ 1,042 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 2.11% 2.13% 2.26% 2.39% 2.65% 2.22% Net investment loss (1.81)% (1.82)% (1.83)% (1.33)% (1.64)% (1.70)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 2.11% 2.13% 2.26% 2.39% 2.64% 2.20% Net investment loss (1.81)% (1.82)% (1.83)% (1.33)% (1.63)% (1.68)% =================================================================================================================================== * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized. + Ratios with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. 30 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 ----------------------------------------------------------------------------------------------------------------- Six Months Ended Year Year 8/3/09 6/30/12 Ended Ended to (Unaudited) 12/31/11 12/31/10 12/31/09 (a) Class R Net asset value, beginning of period $ 26.43 $ 27.20 $ 22.80 $ 20.45 ----------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment loss $ (0.19) $ (0.37) $ (0.29) $ (0.04) Net realized and unrealized gain (loss) on investments 2.13 (0.40) 4.69 2.39 ----------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.94 $ (0.77) $ 4.40 $ 2.35 ----------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 1.94 $ (0.77) $ 4.40 $ 2.35 ----------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 28.37 $ 26.43 $ 27.20 $ 22.80 ================================================================================================================= Total return* 7.34% (2.83)% 19.30% 11.49%(b) Ratio of net expenses to average net assets+ 1.66%** 1.57% 1.55% 1.58%** Ratio of net investment loss to average net assets+ (1.35)%** (1.25)% (1.12)% (0.49)%** Portfolio turnover rate 116%** 112% 114% 140%** Net assets, end of period (in thousands) $ 9,132 $ 9,033 $ 10,677 $ 10,515 Ratios with reduction for fees paid indirectly: Net expenses 1.66%** 1.57% 1.55% 1.58%** Net investment loss (1.35)%** (1.25)% (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. The accompanying notes are an integral part of these financial statements. Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 31 Financial Highlights (continued) ----------------------------------------------------------------------------------------------------------------------------------- Six Months Ended Year Year Year Year Year 6/30/12 Ended Ended Ended Ended Ended (Unaudited) 12/31/11 12/31/10 12/31/09 12/31/08 12/31/07 Class Y Net asset value, beginning of period $ 27.55 $ 28.13 $ 23.39 $ 16.26 $ 25.59 $ 29.05 ----------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations: Net investment gain (loss) $ (0.07) $ (0.14) $ (0.11) $ 0.01 $ 0.05 $ (0.06) Net realized and unrealized gain (loss) on investments 2.23 (0.43) 4.85 7.13 (9.07) (1.04) ----------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 2.16 $ (0.58) $ 4.74 $ 7.13 $ (9.02) $ (1.10) ----------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net realized gain -- -- -- -- (0.31) (2.36) ----------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 2.16 $ (0.58) $ 4.74 $ 7.13 $ (9.33) $ (3.46) ----------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 29.71 $ 27.55 $ 28.13 $ 23.39 $ 16.26 $ 25.59 =================================================================================================================================== Total return* 7.84% (2.06)% 20.26% 43.85% (35.06)% (3.48)% Ratio of net expenses to average net assets+ 0.75%** 0.75% 0.76% 0.77% 0.79% 0.71% Ratio of net investment income (loss) to average net assets+ (0.44)%** (0.44)% (0.34)% (0.04)% 0.23% (0.19)% Portfolio turnover rate 116%** 112% 114% 140% 221% 104% Net assets, end of period (in thousands) $ 39,576 $ 39,253 $ 49,527 $ 82,061 $ 42,259 $ 75,001 Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.75%** 0.75% 0.76% 0.77% 0.79% 0.71% Net investment income (loss) (0.44)%** (0.44)% (0.34)% 0.04% 0.23% (0.19)% =================================================================================================================================== * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period. ** Annualized. + Ratios with no reduction for fees paid indirectly. (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. 32 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 Notes to Financial Statements | 6/30/12 (unaudited) 1. Organization and Significant Accounting Policies Pioneer Growth Opportunities Fund (the Fund) is one of two 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. 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 gain or loss on investments during the reporting period. Actual results could differ from those estimates. Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 33 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. 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. 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. 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. 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. Examples of a significant event might include political or economic news, corporate restructurings, natural disasters, terrorist activity or trading halts. Thus, the valuation of the Fund's securities may differ from exchange prices. At June 30, 2012, no securities were valued using fair value methods (other than securities that were 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. Dividend income is recorded on the ex-dividend date except that certain dividends from foreign securities where the ex-dividend date may have passed are recorded as soon as the Fund becomes aware of the ex-dividend data in 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. 34 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 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 federal and state 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. There were no distributions paid during the years ended December 31, 2011. The tax character of current year distributions payable will be determined at the end of the current taxable year. The following shows the components of accumulated losses on a federal income tax basis at December 31, 2011: ------------------------------------------------------------------------------- 2011 ------------------------------------------------------------------------------- Accumulated losses: Capital loss carryforward $ (109,863,857) Current year post October loss deferred (9,511,014) Unrealized appreciation 53,086,712 ------------------------------------------------------------------------------- Total $ (66,288,159) =============================================================================== The difference between book basis and tax basis unrealized appreciation is attributable to the tax deferral of losses on wash sales. Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 35 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 $18,055 in underwriting commissions on the sale of Class A shares during the six months ended June 30, 2012. 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. During the six months ended June 30, 2012. The Fund recognized gains of $787 in settlement of class action lawsuits from several different companies, as reflected on the Statement of Operations. 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 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. Risks 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. 36 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 G. Securities Lending The Fund may lend 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. At June 30, 2012, the Fund had no securities on loan. H. 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. Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 37 I. Option Writing The Fund 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 Fund generally purchases put options or writes 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 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 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. Transactions in written call options for the six months ended June 30, 2012 are summarized as follows: ------------------------------------------------------------------------------ Number of Premiums Contracts Received ------------------------------------------------------------------------------ Options outstanding at beginning of year 829 $ 131,222 Options opened 4,003 538,078 Options exercised (2,369) (463,598) Options closed (416) (61,327) Options expired (1,791) (114,261) ------------------------------------------------------------------------------ Options outstanding at end of period 256 $ 30,114 ============================================================================== 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 $39,347 in management fees, administrative costs and certain other reimbursements payable to PIM at June 30, 2012. 38 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 Effective March 5, 2012 PIM has retained Brown Brothers Harriman & Co. to provide certain sub-administration and accounting services to the Fund. 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 six months ended June 30, 2012 such out-of-pocket expenses by class of shares were as follows: ------------------------------------------------------------------------------ Shareholder Communications: ------------------------------------------------------------------------------ Class A $ 256,941 Class B 18,875 Class C 52,251 Class R 18,349 Class Y 4,965 ------------------------------------------------------------------------------ Total $ 351,380 ============================================================================== Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $173,473 in transfer agent fees and out-of-pocket reimbursements payable to PIMSS at June 30, 2012. 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 $13,828 in distribution fees payable to PFD at June 30, 2012. 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 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 39 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 12 months of purchase. 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 six months ended June 30, 2012, CDSCs in the amount of $7,187 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 six months ended June 30, 2012, 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 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. The credit facility in effect until January 20, 2012 was in the amount of $165 million. Under such facility, interest on borrowings was 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 credit facility in effect as of February 15, 2012 is in the amount of $215 million. Under such facility, depending on the type of loan, interest on borrowings is payable at LIBOR plus 0.90% on an annualized basis, or the Alternate Base Rate, which is the greater of (a) the facility's administrative agent's daily announced prime rate on the borrowing date, (b) 2% plus the Federal Funds Rate on the borrowing date and (c) 2% plus the overnight Euro dollar rate on the borrowing date. The Funds pay an annual commitment fee to participate in a credit facility. The commitment fee is allocated among 40 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 participating Funds based on an allocation schedule set forth in the credit agreement. For the six months ended June 30, 2012, the Fund had no borrowings under a credit facility. 7. Additional Disclosures about Derivative Instruments and Hedging Activities The effect of derivative instruments on the Statement of Operations for the six months ended June 30, 2012 was as follows: ----------------------------------------------------------------------------------- Derivatives Not Change in Accounted for as Realized Unrealized Hedging Instruments Gain on Gain or (Loss) Under Accounting Location of Gain or (Loss) Derivatives on Derivatives Standards Codification on Derivatives Recognized Recognized Recognized (ASC) 185 in Income in Income in Income ----------------------------------------------------------------------------------- Equity Contracts -- Net realized gain on written Options options closed/expired $301,961 -- ------------------------------------------------------------------------------------ Equity Contracts -- Change in net unrealized loss Options on written options -- $(97,696) ------------------------------------------------------------------------------------ Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 41 Trustees, Officers and Service Providers Trustees Officers Thomas J. Perna, Chairman John F. Cogan, Jr., President* David R. Bock Daniel K. Kingsbury, Executive Mary K. Bush Vice President John F. Cogan, Jr. Mark E. Bradley, Treasurer** Benjamin M. Friedman Christopher J. Kelley, Secretary Margaret B.W. Graham Daniel K. Kingsbury Marguerite A. Piret Stephen K. West Investment Adviser and Administrator Pioneer Investment Management, Inc. Custodian and Sub-Administrator Brown Brothers Harriman & Co. 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 us.pioneerinvestments.com. This information is also available on the Securities and Exchange Commission's web site at http://www.sec.gov. * Chief Executive Officer of the Funds ** Chief Financial and Accounting Officer of the Funds 42 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 This page for your notes. Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 43 This page for your notes. 44 Pioneer Growth Opportunities Fund | Semiannual Report | 6/30/12 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: us.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. LOGO] Pioneer Investment(R) Pioneer Investment Management, Inc. 60 State Street Boston, MA 02109 us.pioneerinvestments.com Securities offered through Pioneer Funds Distributor, Inc. 60 State Street, Boston, MA 02109 Underwriter of Pioneer Mutual Funds, Member SIPC (c) 2012 Pioneer Investments 19413-06-0812 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 (see attachment); (2) Post the text of such code of ethics on its Internet website and disclose, in its most recent report on this Form N-CSR, its Internet address and the fact that it has posted such code of ethics on its Internet website; or (3) Undertake in its most recent report on this Form N-CSR to provide to any person without charge, upon request, a copy of such code of ethics and explain the manner in which such request may be made. 	See Item 10(2) ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT. (a) (1) Disclose that the registrant's board of trustees has determined that the registrant either: (i) Has at least one audit committee financial expert serving on its audit committee; or (ii) Does not have an audit committee financial expert serving on its audit committee. The registrant's Board of Trustees has determined that the registrant has at least one audit committee financial expert. (2) If the registrant provides the disclosure required by paragraph (a)(1)(i) of this Item, it must disclose the name of the audit committee financial expert and whether that person is "independent." In order to be considered "independent" for purposes of this Item, a member of an audit committee may not, other than in his or her capacity as a member of the audit committee, the board of trustees, or any other board committee: (i) Accept directly or indirectly any consulting, advisory, or other compensatory fee from the issuer; or (ii) Be an "interested person" of the investment company as defined in Section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19)). Ms. Marguerite A. Piret, an independent trustee, is such an audit committee financial expert. (3) If the registrant provides the disclosure required by paragraph (a)(1) (ii) of this Item, it must explain why it does not have an audit committee financial expert. Not applicable. ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES. (a) Disclose, under the caption AUDIT FEES, the aggregate fees billed for each of the last two fiscal years for professional services rendered by the principal accountant for the audit of the registrant's annual financial statements or services that are normally provided by the accountant in connection with statutory and regulatory filings or engagements for those fiscal years. N/A (b) Disclose, under the caption AUDIT-RELATED FEES, the aggregate fees billed in each of the last two fiscal years for assurance and related services by the principal accountant that are reasonably related to the performance of the audit of the registrant's financial statements and are not reported under paragraph (a) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A (c) Disclose, under the caption TAX FEES, the aggregate fees billed in each of the last two fiscal years for professional services rendered by the principal accountant for tax compliance, tax advice, and tax planning. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A (d) Disclose, under the caption ALL OTHER FEES, the aggregate fees billed in each of the last two fiscal years for products and services provided by the principal accountant, other than the services reported in paragraphs (a) through (c) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A (e) (1) Disclose the audit committee's pre-approval policies and procedures described in paragraph (c)(7) of Rule 2-01 of Regulation S-X. PIONEER FUNDS APPROVAL OF AUDIT, AUDIT-RELATED, TAX AND OTHER SERVICES PROVIDED BY THE INDEPENDENT AUDITOR SECTION I - POLICY PURPOSE AND APPLICABILITY The Pioneer Funds recognize the importance of maintaining the independence of their outside auditors. Maintaining independence is a shared responsibility involving Pioneer Investment Management, Inc ("PIM"), the audit committee and the independent auditors. The Funds recognize that a Fund's independent auditors: 1) possess knowledge of the Funds, 2) are able to incorporate certain services into the scope of the audit, thereby avoiding redundant work, cost and disruption of Fund personnel and processes, and 3) have expertise that has value to the Funds. As a result, there are situations where it is desirable to use the Fund's independent auditors for services in addition to the annual audit and where the potential for conflicts of interests are minimal. Consequently, this policy, which is intended to comply with Rule 210.2-01(C)(7), sets forth guidelines and procedures to be followed by the Funds when retaining the independent audit firm to perform audit, audit-related tax and other services under those circumstances, while also maintaining independence. Approval of a service in accordance with this policy for a Fund shall also constitute approval for any other Fund whose pre-approval is required pursuant to Rule 210.2-01(c)(7)(ii). In addition to the procedures set forth in this policy, any non-audit services that may be provided consistently with Rule 210.2-01 may be approved by the Audit Committee itself and any pre-approval that may be waived in accordance with Rule 210.2-01(c)(7)(i)(C) is hereby waived. Selection of a Fund's independent auditors and their compensation shall be determined by the Audit Committee and shall not be subject to this policy. SECTION II - POLICY ---------------- -------------------------------- ------------------------------------------------- SERVICE SERVICE CATEGORY DESCRIPTION SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES CATEGORY ---------------- -------------------------------- ------------------------------------------------- I. AUDIT Services that are directly o Accounting research assistance SERVICES related to performing the o SEC consultation, registration independent audit of the Funds statements, and reporting o Tax accrual related matters o Implementation of new accounting standards o Compliance letters (e.g. rating agency letters) o Regulatory reviews and assistance regarding financial matters o Semi-annual reviews (if requested) o Comfort letters for closed end offerings ---------------- -------------------------------- ------------------------------------------------- II. Services which are not o AICPA attest and agreed-upon procedures AUDIT-RELATED prohibited under Rule o Technology control assessments SERVICES 210.2-01(C)(4) (the "Rule") o Financial reporting control assessments and are related extensions of o Enterprise security architecture the audit services support the assessment audit, or use the knowledge/expertise gained from the audit procedures as a foundation to complete the project. In most cases, if the Audit-Related Services are not performed by the Audit firm, the scope of the Audit Services would likely increase. The Services are typically well-defined and governed by accounting professional standards (AICPA, SEC, etc.) ---------------- -------------------------------- ------------------------------------------------- ------------------------------------- ------------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the audit period for all services and related fees pre-approved specific service reported at each regularly subcategories. Approval of the scheduled Audit Committee independent auditors as meeting. auditors for a Fund shall constitute pre approval for these services. ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the fund fiscal year within services and related fees a specified dollar limit (including comparison to for all pre-approved specified dollar limits) specific service subcategories reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limit for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for Audit-Related Services not denoted as "pre-approved", or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------------------ SECTION III - POLICY DETAIL, CONTINUED ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- --------------------------- ----------------------------------------------- III. TAX SERVICES Services which are not o Tax planning and support prohibited by the Rule, o Tax controversy assistance if an officer of the Fund o Tax compliance, tax returns, excise determines that using the tax returns and support Fund's auditor to provide o Tax opinions these services creates significant synergy in the form of efficiency, minimized disruption, or the ability to maintain a desired level of confidentiality. ----------------------- --------------------------- ----------------------------------------------- ------------------------------------- ------------------------- AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------- ------------------------------------- ------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year all such services and within a specified dollar limit related fees 				 (including comparison 			 to specified dollar 			 limits) reported 			 quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for tax services not denoted as pre-approved, or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------- SECTION III - POLICY DETAIL, CONTINUED ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- --------------------------- ----------------------------------------------- IV. OTHER SERVICES Services which are not o Business Risk Management support prohibited by the Rule, o Other control and regulatory A. SYNERGISTIC, if an officer of the Fund compliance projects UNIQUE QUALIFICATIONS determines that using the Fund's auditor to provide these services creates significant synergy in the form of efficiency, minimized disruption, the ability to maintain a desired level of confidentiality, or where the Fund's auditors posses unique or superior qualifications to provide these services, resulting in superior value and results for the Fund. ----------------------- --------------------------- ----------------------------------------------- --------------------------------------- ------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- -------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year within all such services and a specified dollar limit related fees 			 (including comparison 			 to specified dollar 				 limits) reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for "Synergistic" or "Unique Qualifications" Other Services not denoted as pre-approved to the left, or to add a specific service subcategory as "pre-approved" ------------------------------------- -------------------------- SECTION III - POLICY DETAIL, CONTINUED ----------------------- ------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PROHIBITED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- ------------------------- ----------------------------------------------- PROHIBITED SERVICES Services which result 1. Bookkeeping or other services in the auditors losing related to the accounting records or independence status financial statements of the audit under the Rule. client* 2. Financial information systems design and implementation* 3. Appraisal or valuation services, fairness* opinions, or contribution-in-kind reports 4. Actuarial services (i.e., setting actuarial reserves versus actuarial audit work)* 5. Internal audit outsourcing services* 6. Management functions or human resources 7. Broker or dealer, investment advisor, or investment banking services 8. Legal services and expert services unrelated to the audit 9. Any other service that the Public Company Accounting Oversight Board determines, by regulation, is impermissible ----------------------- ------------------------- ----------------------------------------------- ------------------------------------------- ------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------------- ------------------------------ o These services are not to be o A summary of all performed with the exception of the(*) services and related services that may be permitted fees reported at each if they would not be subject to audit regularly scheduled procedures at the audit client (as Audit Committee meeting defined in rule 2-01(f)(4)) level will serve as continual the firm providing the service. confirmation that has 				 not provided any restricted services. ------------------------------------------- ------------------------------ -------------------------------------------------------------------------------- GENERAL AUDIT COMMITTEE APPROVAL POLICY: o For all projects, the officers of the Funds and the Fund's auditors will each make an assessment to determine that any proposed projects will not impair independence. o Potential services will be classified into the four non-restricted service categories and the "Approval of Audit, Audit-Related, Tax and Other Services" Policy above will be applied. Any services outside the specific pre-approved service subcategories set forth above must be specifically approved by the Audit Committee. o At least quarterly, the Audit Committee shall review a report summarizing the services by service category, including fees, provided by the Audit firm as set forth in the above policy. -------------------------------------------------------------------------------- (2) Disclose the percentage of services described in each of paragraphs (b) through (d) of this Item that were approved by the audit committee pursuant to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X. N/A (f) If greater than 50 percent, disclose the percentage of hours expended on the principal accountant's engagement to audit the registrant's financial statements for the most recent fiscal year that were attributed to work performed by persons other than the principal accountant's full-time, permanent employees. N/A (g) Disclose the aggregate non-audit fees billed by the registrant's accountant for services rendered to the registrant, and rendered to the registrant's investment adviser (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant for each of the last two fiscal years of the registrant. N/A (h) Disclose whether the registrant's audit committee of the board of trustees has considered whether the provision of non-audit services that were rendered to the registrant's investment adviser (not including any subadviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the investment adviser that provides ongoing services to the registrant that were not pre-approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant's independence. 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 August 29, 2012 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 August 29, 2012 By (Signature and Title)* /s/ Mark Bradley Mark Bradley, Treasurer & Chief Accounting & Financial Officer Date August 29, 2012 * Print the name and title of each signing officer under his or her signature.