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 811-02864 Pioneer Bond Fund (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: June 30 Date of reporting period: July 1, 2010 through December 31, 2010 Form N-CSR is to be used by management investment companies to file reports with the Commission not later than 10 days after the transmission to stockholders of any report that is required to be transmitted to stockholders under Rule 30e-1 under the Investment Company Act of 1940 (17 CFR 270.30e-1). The Commission may use the information provided on Form N-CSR in its regulatory, disclosure review, inspection, and policymaking roles. A registrant is required to disclose the information specified by Form N-CSR, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-CSR unless the Form displays a currently valid Office of Management and Budget ("OMB") control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. ss. 3507. ITEM 1. REPORTS TO SHAREOWNERS. Pioneer Bond Fund - -------------------------------------------------------------------------------- Semiannual Report | December 31, 2010 - -------------------------------------------------------------------------------- Ticker Symbols: Class A PIOBX Class B PBOBX Class C PCYBX Class R PBFRX Class Y PICYX Class Z PIBZX [LOGO] PIONEER Investments(R) visit us: pioneerinvestments.com Table of Contents Letter to Shareowners 2 Portfolio Management Discussion 4 Portfolio Summary 8 Prices and Distributions 9 Performance Update 10 Comparing Ongoing Fund Expenses 16 Schedule of Investments 18 Financial Statements 67 Notes to Financial Statements 77 Approval of Investment Advisory Agreement 87 Trustees, Officers and Service Providers 91 Pioneer Bond Fund | Semiannual Report | 12/31/10 1 President's Letter Dear Shareowner, Throughout 2010, the U.S. economy moved forward on a slow path to recovery. But with the memory of a deep recession still lingering, businesses and consumers remained cautious about both investing and spending. While business fundamentals showed signs of improvement, there was still a reluctance to hire, and high unemployment remains a problem. Wary investors, concerned about risk, gravitated towards cash and bonds, until a rally late in the year lifted equity returns. We remain generally optimistic about the prospects for economic recovery, although it may occur more slowly than many would like. At Pioneer, we have long advocated the benefits of staying diversified and investing for the long term. This strategy has generally performed well for many investors. Bond markets certainly rewarded investors in the first eleven months of 2010. While the equity markets barely budged for those first eleven months, valuations were inexpensive relative to bonds, compared with historic levels, and represented potentially good value for long-term investors, many of whom were rewarded in the subsequent late-year equity rally. Pioneer has not changed the basic approach to investing that we have used for more than 80 years. We remain focused on company fundamentals and risk management. Our investment process is based on careful research into individual companies, quantitative analysis, and active portfolio management. This three-pillared process, which we apply to each of our portfolios, is supported by an integrated team approach and is designed to carefully balance risk and reward. Our experienced professionals devote themselves to the careful research needed to identify investment opportunities in markets around the world. Our advice, as always, is to work closely with a trusted financial advisor to discuss your goals and work together to develop an investment strategy that meets your individual needs. There is no single best strategy that works for every investor. 2 Pioneer Bond Fund | Semiannual Report | 12/31/10 We invite you to learn more about Pioneer and our time-tested approach to investing by consulting with your financial advisor or visiting us online at www.pioneerinvestments.com. We greatly appreciate your trust in us and we thank you for investing with Pioneer. Sincerely, /s/ Daniel K. Kingsbury Daniel K. Kingsbury President and CEO Pioneer Investment Management USA, Inc. Any information in this shareowner report regarding market or economic trends or the factors influencing the Fund's historical or future performance are statements of the opinion of Fund management as of the date of this report. These statements should not be relied upon for any other purposes. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. Pioneer Bond Fund | Semiannual Report | 12/31/10 3 Portfolio Management Discussion | 12/31/10 The bond market generated modest, positive results in the second half of 2010, with corporate bonds and other credit-sensitive securities outperforming Treasuries, government agencies and other high-grade securities. In the following interview, Kenneth J. Taubes discusses the factors that affected the performance of Pioneer Bond Fund during the six months ended December 31, 2010. Mr. Taubes, the Chief Investment Officer at Pioneer Investments, is responsible for the daily management of the Fund. Q How did the Fund perform during the second half of 2010? A Pioneer Bond Fund Class A shares returned 3.52% at net asset value during the six months ended December 31, 2010, while the Fund's benchmark, the Barclays Capital Aggregate Bond Index (the Barclays Index), returned 1.15%. Over the same period, the average return of the 149 mutual funds in Lipper's Corporate Debt, A-Rated Fund category was 2.13%. On December 31, 2010, the 30-day SEC yield of Class A shares was 4.31%. Q What were the principal factors that influenced the Fund's performance over the six months ended December 31, 2010? A Throughout the six-month period, we maintained a positive outlook for the economy, believing the pace of the recovery -- as reflected by gross domestic product (GDP) -- would proceed faster than the investment markets generally anticipated. We overweighted the Fund to corporate securities, which stood to benefit from an improving economy, and we reduced the Fund's overall duration (duration is a measure of a portfolio's sensitivity to changes in interest rates). We believed that if the economy did grow faster than expected, the risk of rising interest rates would increase. In fact, interest rates did rise over the six-month period, with yields on 10-year Treasuries increasing from 2.93% to 3.29%. The pace of the economic recovery did quicken during the period, with reported GDP growth for the third calendar quarter of 2010 (through September 30) increasing to 2.6% from 1.7% in the second quarter. Both the overweighting of corporate debt and the short-duration positioning helped the Fund outperform the benchmark Barclays Index and its Lipper peer group of mutual funds over the six months ended December 31, 2010. In emphasizing corporate bonds, we significantly underweighted the Fund to Treasuries. We believed having exposure to credit risk made sense, given the healthy growth in corporate profits and the solid position of corporate balance sheets. In addition, we thought the risk of a "double-dip" recession, which was a concern last summer, had faded and that the economic recovery was likely to proceed and strengthen. We believed that yield spreads -- 4 Pioneer Bond Fund | Semiannual Report | 12/31/10 or yield differences between various types of debt instruments -- were likely to narrow, leading to outperformance by corporate bonds over Treasuries and government agency bonds. We focused on investment-grade corporate bonds rated A and BBB, which together accounted for 38.5% of the Fund's assets as of December 31, 2010. In addition, we maintained a healthy Fund exposure to higher-yielding, below-investment grade corporate bonds. High-yield corporate bonds and loans accounted for 17.5% of the Fund's assets at the end of the six-month period. Both the investment-grade and high-yield corporate holdings helped drive the Fund's strong performance for the six-month period. In addition to de-emphasizing Treasuries, we also underweighted the Fund to government agency mortgages, while increasing exposure to non-agency mortgage-backed securities. The non-agency mortgages, which are not part of the Barclays Index benchmark, performed quite well during the six-month period. Overall, the Fund's reduced allocation to government securities and greater exposure to corporate bonds resulted in a portfolio with an average credit quality rating lower than that of the Barclays Index. The positioning helped the Fund's performance during the period, as lower-quality securities generally outperformed higher-quality securities. Q What types of individual investments had the greatest influence on the Fund's performance results, either positively or negatively, during the six months ended December 31, 2010? A Several of the Fund's corporate bond holdings performed particularly well. The greatest single support to the Fund's performance results came from an investment in securities of Forest City Enterprises, a real estate company that owns and operates commercial and residential developments. As the financials sector rebounded, the Fund's position in securities issued by investment bank Goldman Sachs also performed very well. Other contributors to the Fund's performance results included securities issued by Domino's Pizza and insurance company MetLife. The three largest detractors from Fund performance during the six-month period were all long-term Treasuries, the prices of which declined as yields rose in the Treasury market. Q What is your investment outlook? A We retain a favorable outlook for the domestic economy and think that GDP could grow by more than 3% for 2011, especially if expanded capital spending by corporations and increased discretionary spending by consumers help broaden the reach of the economic recovery. We do not expect a dramatic improvement in employment trends in the private sector, although we do think we will see a slow increase in new-job creation. Inflation -- at least as reflected by the core consumer price index -- remains Pioneer Bond Fund | Semiannual Report | 12/31/10 5 restrained, despite some early evidence of inflationary pressures in the commodity markets. Accordingly, we anticipate that the U.S. Federal Reserve Board (the Fed) will remain accommodative, keeping short-term interest rates low and encouraging liquidity in the financial system. Going forward, we believe one risk to the fixed-income markets is that inflationary pressures will grow faster than the Fed expects and that the nation's central bank may wait too long before starting to tighten monetary policy. We expect that fixed-income investors generally will continue to shun Treasuries and government agency securities, especially if the economic expansion picks up speed. Another potential risk that will bear watching will be the economic outlook in Europe, especially if more national governments start disclosing severe debt problems. This could pose problems for the European banking system as well as the European Union in general. Overall, we are positive about investments in domestic corporate securities. We also may look for opportunities in the municipal bond market, where many tax-advantaged bonds are selling at compelling prices relative to taxable securities. Please refer to the Schedule of Investments on pages 18-66 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 the issuers of the underlying securities and their inability to meet their debt obligations. Prepayment risk is the chance that mortgage-backed bonds will be paid off early if falling interest rates prompt homeowners to refinance their mortgages. Forced to reinvest the unanticipated proceeds at lower interest rates, the Fund would experience a decline in income and lose the opportunity for additional price appreciation associated with falling interest rates. Investments in high-yield or lower-rated securities are subject to greater-than-average risk. The securities issued by U.S. Government sponsored entities (i.e., Fannie Mae, Freddie Mac) are neither guaranteed nor issued by the U.S. Government. The portfolio may invest in mortgage-backed securities, which during times of fluctuating interest rates may increase or decrease more than other fixed-income securities. At times, the Fund's investments may represent industries or industry sectors that are interrelated or have common risks, making the Fund more susceptible to any economic, political, or regulatory developments or other risks affecting those industries and sectors. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. 6 Pioneer Bond Fund | Semiannual Report | 12/31/10 Any information in this shareholder report regarding market or economic trends or the factors influencing the Fund's historical or future performance are statements of the opinion of Fund management as of the date of this report. These opinions should not be relied upon for any other purposes. Pioneer Bond Fund | Semiannual Report | 12/31/10 7 Portfolio Summary | 12/31/10 Portfolio Diversification - -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] U.S. Corporate Bonds 41.1% U.S. Government Securities 20.9% Collateralized Mortgage Obligations 17.1% Senior Secured Loans 9.3% Asset Backed Securities 7.1% Preferred Stocks 1.4% Temporary Cash Investments 1.4% Municipal Bonds 1.0% Convertible Corporate Bonds 0.6% Foreign Government Bonds 0.1% Portfolio Quality - -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] AAA 1.4% AA 4.3% A 12.9% BBB 25.6% BB 10.6% B & Lower 6.9% Commercial Paper 1.0% Treasury/Agency 37.3% 10 Largest Holdings - -------------------------------------------------------------------------------- (As a percentage of total long-term holdings)* 1. U.S. Treasury Bonds, 2.75%, 2/15/19 0.97% 2. Goldman Sachs Capital, Floating Rate Note, 12/29/49 0.79 3. Forest City Enterprises, Inc., 7.0%, 12/31/49 0.78 4. U.S. Treasury Notes, 4.5%, 8/15/39 0.78 5. U.S. Treasury Notes, 4.5%, 5/15/38 0.73 6. Wachovia Bank Commercial Mortgage Trust, 4.368%, 8/15/41 0.72 7. U.S. Treasury Notes, 4.5%, 2/15/36 0.64 8. U.S. Treasury Notes, 4.25%, 5/15/39 0.63 9. State Street Capital, 8.25%, 3/15/42 0.57 10. PNC Funding Corp., Floating Rate Note, 5/29/49 0.56 * This list excludes temporary cash investments and derivative instruments. The Fund 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 Bond Fund | Semiannual Report | 12/31/10 Prices and Distributions | 12/31/10 Net Asset Value per Share - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- Class 12/31/10 6/30/10 - -------------------------------------------------------------------------------- A $ 9.55 $ 9.44 - -------------------------------------------------------------------------------- B $ 9.49 $ 9.38 - -------------------------------------------------------------------------------- C $ 9.45 $ 9.34 - -------------------------------------------------------------------------------- R $ 9.64 $ 9.52 - -------------------------------------------------------------------------------- Y $ 9.47 $ 9.36 - -------------------------------------------------------------------------------- Z $ 9.57 $ 9.46 - -------------------------------------------------------------------------------- Distributions per Share: 7/1/10-12/31/10 - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains - -------------------------------------------------------------------------------- A $ 0.2217 $ -- $ -- - -------------------------------------------------------------------------------- B $ 0.1704 $ -- $ -- - -------------------------------------------------------------------------------- C $ 0.1772 $ -- $ -- - -------------------------------------------------------------------------------- R $ 0.2044 $ -- $ -- - -------------------------------------------------------------------------------- Y $ 0.2318 $ -- $ -- - -------------------------------------------------------------------------------- Z $ 0.2329 $ -- $ -- - -------------------------------------------------------------------------------- The Barclays Capital Aggregate Bond Index is a measure of the U.S. 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 on pages 10-15. Pioneer Bond Fund | Semiannual Report | 12/31/10 9 Performance Update | 12/31/10 Class A Shares Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Bond Fund at public offering price, compared to that of the Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of December 31, 2010) - -------------------------------------------------------------------------------- Net Asset Public Offering Period Value (NAV) Price (POP) - -------------------------------------------------------------------------------- 10 Years 6.44% 5.95% 5 Years 6.24 5.27 1 Year 9.44 4.51 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated November 1, 2010) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 1.07% 0.85% - -------------------------------------------------------------------------------- Value of $10,000 Investment [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Pioneer Barclays Capital Bond Fund Aggregate Bond Index 12/00 9550 10000 10271 10844 12/02 11172 11957 12161 12447 12/04 12855 12987 13172 13303 12/06 13639 13879 14470 14846 12/08 13839 15624 16288 16551 12/10 17826 17633 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. NAV results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. POP returns reflect deduction of maximum 4.50% sales charge. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. 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 November 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. 10 Pioneer Bond Fund | Semiannual Report | 12/31/10 Performance Update | 12/31/10 Class B Shares Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Bond Fund, compared to that of the Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of December 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- 10 Years 5.48% 5.48% 5 Years 5.21 5.21 1 Year 8.22 4.22 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated November 1, 2010) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 1.98% 1.90% - -------------------------------------------------------------------------------- Value of $10,000 Investment [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Pioneer Barclays Capital Bond Fund Aggregate Bond Index 12/00 10000 10000 10684 10844 12/02 11517 11957 12432 12447 12/04 13031 12987 13219 13303 12/06 13566 13879 14265 14846 12/08 13508 15624 15749 16551 12/10 17044 17633 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. "If Redeemed" returns reflect the deduction of applicable contingent deferred sales charge (CDSC). Effective December 1, 2004, the period during which a CDSC is applied to withdrawals was shortened to 5 years. The maximum CDSC for Class B shares is 4% and declines over five years. For more complete information, please see the prospectus. Note: Shares purchased prior to December 1, 2004, remain subject to the CDSC in effect at the time you purchased those shares. For performance information for shares purchased prior to December 1, 2004, please visit www.pioneerinvestments.com. 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. Please see the prospectus and financial statements for more information. The net expense ratio reflects the contractual expense limitation currently in effect through November 1, 2012, 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. Pioneer Bond Fund | Semiannual Report | 12/31/10 11 Performance Update | 12/31/10 Class C Shares Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Bond Fund, compared to that of the Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of December 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- 10 Years 5.46% 5.46% 5 Years 5.29 5.29 1 Year 8.40 8.40 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated November 1, 2010) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 1.79% 1.79% - -------------------------------------------------------------------------------- Value of $10,000 Investment [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Pioneer Barclays Capital Bond Fund Aggregate Bond Index 12/00 10000 10000 10637 10844 12/02 11453 11957 12343 12447 12/04 12950 12987 13143 13303 12/06 13480 13879 14197 14846 12/08 13453 15624 15691 16551 12/10 17009 17633 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Class C shares held for less than one year are also subject to a 1% contingent deferred sales charge (CDSC). The performance shown for Class C shares does not reflect the 1% front-end sales charge in effect prior to February 1, 2004. If you paid a 1% sales charge, your returns would be lower than those shown above. "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. 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 contractual expense limitations currently in effect through November 1, 2012, for Class C shares. There can be no assurance that Pioneer will extend the expense limitations 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 Bond Fund | Semiannual Report | 12/31/10 Performance Update | 12/31/10 Class R Shares Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Bond Fund, compared to that of the Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of December 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- 10 Years 6.12% 6.12% 5 Years 5.91 5.91 1 Year 9.08 9.08 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated November 1, 2010) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 1.26% 1.25% - -------------------------------------------------------------------------------- Value of $10,000 Investment [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Pioneer Barclays Capital Bond Fund Aggregate Bond Index 12/00 10000 10000 10700 10844 12/02 11581 11957 12604 12447 12/04 13312 12987 13593 13303 12/06 14042 13879 14880 14846 12/08 14155 15624 16606 16551 12/10 18114 17633 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. The performance shown for Class R shares for the period prior to the commencement of operations of Class R shares on April 1, 2003, is based on the performance of Class A shares, reduced to reflect the higher distribution and service fees of Class R shares. For the period beginning on April 1, 2003, the actual performance of Class R shares is reflected. The performance shown for Class R shares does not reflect the 1% CDSC that was in effect prior to July 1, 2004. 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. 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 November 1, 2012, for Class R 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 Bond Fund | Semiannual Report | 12/31/10 13 Performance Update | 12/31/10 Class Y Shares Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 million investment made in Pioneer Bond Fund, compared to that of the Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of December 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- 10 Years 6.80% 6.80% 5 Years 6.58 6.58 1 Year 9.75 9.75 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated November 1, 2010) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 0.61% 0.61% - -------------------------------------------------------------------------------- Value of $5,000,000 Investment [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Pioneer Barclays Capital Bond Fund Aggregate Bond Index 12/00 5000000 5000000 5382932 5422220 12/02 5877103 5978265 6424260 6223624 12/04 6832074 6493641 7021671 6651375 12/06 7301493 6939605 7775360 7423070 12/08 7460011 7812033 8799234 8275350 12/10 9657453 8816672 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Performance shown for periods prior to the inception of the Fund's Class Y shares on September 20, 2001, reflects the NAV performance of the 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. 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 contractual expense limitations currently in effect through June 1, 2012, for Class Y shares. There can be no assurance that Pioneer will extend the expense limitations 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. 14 Pioneer Bond Fund | Semiannual Report | 12/31/10 Performance Update | 12/31/10 Class Z Shares Investment Returns - -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Bond Fund, compared to that of the Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of December 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- 10 Years 6.46% 6.46% 5 Years 6.27 6.27 1 Year 9.56 9.56 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated November 1, 2010) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 0.63% 0.63% - -------------------------------------------------------------------------------- Value of $10,000 Investment [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Pioneer Barclays Capital Bond Fund Aggregate Bond Index 12/00 10000 10000 10754 10844 12/02 11697 11957 12733 12447 12/04 13459 12987 13791 13303 12/06 14209 13879 15035 14846 12/08 14416 15624 17063 16551 12/10 18694 17633 Call 1-800-225-6292 or visit www.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Performance shown for periods prior to the inception of Class Z shares on July 6, 2007, reflects the NAV performance of the 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 Z shares, the performance for Class Z shares prior to their inception on July 6, 2007 would have been higher than that shown. Class Z 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 November 1, 2013, for Class Z 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 Bond Fund | Semiannual Report | 12/31/10 15 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 Bond Fund Based on actual returns from July 1, 2010 through December 31, 2010. - ------------------------------------------------------------------------------------------------------------------------------------ Share Class A B C R Y Z - ------------------------------------------------------------------------------------------------------------------------------------ Beginning Account $ 1,000.00 $ 1,000.00 $ 1,000.00 $ 1,000.00 $ 1,000.00 $ 1,000.00 Value on 7/1/10 - ------------------------------------------------------------------------------------------------------------------------------------ Ending Account Value $ 1,035.20 $ 1,029.90 $ 1,030.80 $ 1,034.10 $ 1,036.60 $ 1,036.30 (after expenses) on 12/31/10 - ------------------------------------------------------------------------------------------------------------------------------------ Expenses Paid $ 4.36 $ 9.72 $ 8.75 $ 5.90 $ 3.13 $ 3.34 During Period* - ------------------------------------------------------------------------------------------------------------------------------------ * Expenses are equal to the Fund's annualized expense ratio of 0.85%, 1.90%, 1.71%, 1.15%, 0.61%, and 0.65% for Class A, Class B, Class C, Class R, Class Y, and Class Z shares, respectively, multiplied by the average account value over the period, multiplied by 184/365 (to reflect the one-half year period). 16 Pioneer Bond Fund | Semiannual Report | 12/31/10 Hypothetical Example for Comparison Purposes The table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the tables are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as sales charges (loads) that are charged at the time of the transaction. Therefore, the table below is useful in comparing ongoing costs only and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher. Expenses Paid on a $1,000 Investment in Pioneer Bond Fund Based on a hypothetical 5% per year return before expenses, reflecting the period from July 1, 2010 through December 31, 2010. - ------------------------------------------------------------------------------------------------------------------------------------ Share Class A B C R Y Z - ------------------------------------------------------------------------------------------------------------------------------------ Beginning Account $ 1,000.00 $ 1,000.00 $ 1,000.00 $ 1,000.00 $ 1,000.00 $ 1,000.00 Value on 7/1/10 - ------------------------------------------------------------------------------------------------------------------------------------ Ending Account Value $ 1,020.92 $ 1,015.63 $ 1,016.59 $ 1,019.41 $ 1,022.13 $ 1,021.93 (after expenses) on 12/31/10 - ------------------------------------------------------------------------------------------------------------------------------------ Expenses Paid $ 4.33 $ 9.65 $ 8.69 $ 5.85 $ 3.11 $ 3.31 During Period* - ------------------------------------------------------------------------------------------------------------------------------------ * Expenses are equal to the Fund's annualized expense ratio of 0.85%, 1.90%, 1.71%, 1.15%, 0.61%, and 0.65% for Class A, Class B, Class C, Class R, Class Y, and Class Z shares, respectively, multiplied by the average account value over the period, multiplied by 184/365 (to reflect the one-half year period). Pioneer Bond Fund | Semiannual Report | 12/31/10 17 Schedule of Investments | 12/31/10 (unaudited) - ------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (d) Ratings Value - ------------------------------------------------------------------------------------------------------- CONVERTIBLE CORPORATE BONDS -- 0.6% ENERGY -- 0.2% Coal & Consumable Fuels -- 0.2% 2,680,000 BB-/NR Massey Energy Co., 3.25%, 8/1/15 $ 2,616,350 -------------- Total Energy $ 2,616,350 - ------------------------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 0.1% Health Care Services -- 0.1% 766,000 B+/B2 Omnicare, Inc., 3.25%, 12/15/35 $ 702,805 -------------- Total Health Care Equipment & Services $ 702,805 - ------------------------------------------------------------------------------------------------------- BANKS -- 0.1% Regional Banks -- 0.1% 2,100,000 A/A3 National City Corp., 4.0%, 2/1/11 $ 2,102,625 -------------- Total Banks $ 2,102,625 - ------------------------------------------------------------------------------------------------------- SEMICONDUCTORS -- 0.2% Semiconductors -- 0.2% 2,160,000 A-/NR Intel Corp., 2.95%, 12/15/35 $ 2,151,900 -------------- Total Semiconductors $ 2,151,900 - ------------------------------------------------------------------------------------------------------- TOTAL CONVERTIBLE CORPORATE BONDS (Cost $6,588,140) $ 7,573,680 - ------------------------------------------------------------------------------------------------------- Shares - ------------------------------------------------------------------------------------------------------- PREFERRED STOCKS -- 1.4% BANKS -- 0.3% Diversified Banks -- 0.3% 4,000 7.19 US Bancorp Preferred, Floating Rate Note, 12/31/99 (Perpetual) $ 3,171,500 -------------- Total Banks $ 3,171,500 - ------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 0.0% Diversified Financial Services -- 0.0% 13,000 Citigroup Capital XIII, 7.875%, 10/30/40 $ 350,220 -------------- Total Diversified Financials $ 350,220 - ------------------------------------------------------------------------------------------------------- INSURANCE -- 0.3% Life & Health Insurance -- 0.3% 153,800 Delphi Financial Group, 7.376%, 5/15/37 $ 3,598,920 -------------- Total Insurance $ 3,598,920 - ------------------------------------------------------------------------------------------------------- REAL ESTATE -- 0.8% Real Estate Operating Companies -- 0.8% 150,400 Forest City Enterprises, Inc., 7.0%, 12/31/49 $ 9,343,600 -------------- Total Real Estate $ 9,343,600 - ------------------------------------------------------------------------------------------------------- TOTAL PREFERRED STOCKS (Cost $14,975,370) $ 16,464,240 - ------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 18 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ------------------------------------------------------------------------------------------------------ Floating S&P/Moody's Rate (d) Ratings Shares (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------ COMMON STOCK -- 0.0% AUTOMOBILES & COMPONENTS -- 0.0% Auto Parts & Equipment -- 0.0% 6,000 Lear Corp.* $ 592,260 -------------- Total Automobiles & Components $ 592,260 - ------------------------------------------------------------------------------------------------------ TOTAL COMMON STOCK (Cost $206,644) $ 592,260 - ------------------------------------------------------------------------------------------------------ Principal Amount ($) - ------------------------------------------------------------------------------------------------------ ASSET BACKED SECURITIES -- 7.1% MATERIALS -- 0.8% Precious Metals & Minerals -- 0.1% 948,493 A/NR Mid-State Trust, 5.25%, 11/1/20 $ 927,147 - ------------------------------------------------------------------------------------------------------ Steel -- 0.7% 4,700,000 AAA/Aa2 First NLC Trust, 0.74719%, 9/25/35 $ 4,420,341 4,273,150 0.73 AA+/Aa3 Nomura Home Equity Loan, Inc., Floating Rate Note, 5/25/35 4,161,595 -------------- $ 8,581,936 -------------- Total Materials $ 9,509,083 - ------------------------------------------------------------------------------------------------------ AUTOMOBILES & COMPONENTS -- 0.1% Automobile Manufacturers -- 0.1% 650,000 BBB/Baa1 AMCAR, 4.2%, 11/8/16 $ 639,792 -------------- Total Automobiles & Components $ 639,792 - ------------------------------------------------------------------------------------------------------ BANKS -- 3.2% Diversified Banks -- 0.1% 1,395,272 0.35 AAA/Aa1 Wells Fargo Home Equity, Floating Rate Note, 4/25/37 $ 1,359,137 - ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- 3.1% 962,897 0.31 AAA/Baa1 Carrington Mortgage Loan Trust, Floating Rate Note, 1/25/37 $ 946,949 381,841 0.75 AA/Aa1 Carrington Mortgage Loan Trust, Floating Rate Note, 2/25/35 380,385 507,156 0.66 AAA/Baa3 Carrington Mortgage Loan Trust, Floating Rate Note, 9/25/35 459,762 2,791,000 5.94 A/B1 Citicorp Residential Mortgage, Floating Rate Note, 7/25/36 2,722,090 809,215 BBB/Baa3 Citigroup Mortgage Loan Trust, 0.34606%, 1/25/37 783,502 139,341 0.36 AAA/Aa3 Citigroup Mortgage Loan Trust, Floating Rate Note, 10/25/36 139,051 1,269,911 0.67 AA+/Aa1 Citigroup Mortgage Loan Trust, Floating Rate Note, 7/25/35 1,228,136 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 19 Schedule of Investments | 12/31/10 (unaudited) (continued) - ------------------------------------------------------------------------------------------------------ Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- (continued) 2,575,000 0.74 AA+/A3 Countrywide Asset-Backed Certificates, Floating Rate Note, 11/25/35 $ 2,401,296 1,047,000 0.65 AA+/Aa2 Countrywide Asset-Backed Certificates, Floating Rate Note, 8/25/35 971,156 1,291,655 0.68 AA+/Aa1 Countrywide Asset-Backed Certificates, Floating Rate Note, 8/25/35 1,278,059 1,502,711 0.88 AA+/Aa1 Countrywide Asset-Backed Certificates, Floating Rate Note, 1/25/35 1,452,791 2,728,909 5.07 AAA/Ba2 Countrywide Asset-Backed Certificates, Floating Rate Note, 12/25/35 2,610,840 700,000 6.25 AA/B1 Credit-Based Asset Servicing, Floating Rate Note, 10/25/36 700,364 1,445,288 0.96 AA+/Aa2 Credit-Based Asset Servicing, Floating Rate Note, 5/25/50 1,379,183 1,555,230 5.56 AAA/A2 CRMSI 2006-2 A3, Floating Rate Note, 9/25/36 1,564,925 1,848,864 AAA/A1 FBR Securitization Trust, 2.76188%, 9/25/35 1,762,946 629,236 0.80 AAA/Aaa First Franklin Mortgage Loan Asset-Backed Certificate, Floating Rate Note, 9/24/34 598,679 622,144 0.37 A/A2 Fremont Home Loan Trust, Floating Rate Note, 2/25/36 616,478 1,700,000 0.79 AA+/A1 GSAA Trust, Floating Rate Note, 6/25/35 1,598,406 53,248 0.52 AAA/Aa2 GSAMP Trust, Floating Rate Note, 11/25/35 53,175 645,690 0.69 A/A2 GSAMP Trust, Floating Rate Note, 3/25/35 621,098 341,160 0.63 AAA/Aaa GSAMP Trust, Floating Rate Note, 8/25/36 335,344 968,179 0.64 AAA/Aa1 GSAMP Trust, Floating Rate Note, 9/25/35 944,916 1,200,000 AA/NR Leaf II Receivables, 4.9%, 3/20/13 1,190,188 4,946,888 CCC+/B1 Local Insight Media Finance LLC, 5.88%, 10/23/37 2,226,100 172,442 0.30 AAA/Aaa Morgan Stanley ABS Capital, Inc., Floating Rate Note, 10/25/36 172,215 554,131 0.32 B/Ba3 Morgan Stanley ABS Capital, Inc., Floating Rate Note, 12/25/36 526,897 2,002,900 BB-/B1 Morgan Stanley Home Equity Loan, 0.28125%, 12/25/36 1,955,448 1,051,975 0.36 BB-/Ba3 Morgan Stanley Home Equity Loan, Floating Rate Note, 4/25/37 972,569 50,177 A-/Caa2 Morgan Stanley Ixis Real Estate, 1.445%, 11/25/36 49,936 The accompanying notes are an integral part of these financial statements. 20 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ------------------------------------------------------------------------------------------------------ Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- (continued) 543,487 0.38 A/Aa3 Option One Mortgage Loan Trust, Floating Rate Note, 2/25/38 $ 529,865 192,341 0.35 BBB+/Baa2 Option One Mortgage Loan Trust, Floating Rate Note, 5/25/37 189,217 1,500,000 0.67 AA+/A3 RASC 2005-KS7 M1, Floating Rate Note, 8/25/35 1,416,545 1,485,379 0.51 BB/Baa1 SASC 2007-BC4 A3, Floating Rate Note, 11/25/37 1,427,521 1,189,268 BB-/Ba3 Saxon Asset Securities, 0.34594%, 11/25/36 1,127,132 -------------- $ 37,333,164 -------------- Total Banks $ 38,692,301 - ------------------------------------------------------------------------------------------------------ DIVERSIFIED FINANCIALS -- 2.1% Consumer Finance -- 0.1% 36,541 BBB-/A2 Indymac Residential Asset Backed Securities, 0.32375%, 7/25/37 $ 36,492 749,797 AAA/Baa2 Specialty Underwriting & Residential, 0.64625%, 6/25/36 705,452 -------------- $ 741,944 - ------------------------------------------------------------------------------------------------------ Diversified Financial Services -- 0.5% 356,512 0.70 AA/Aa2 Asset Backed Securities Corp., Floating Rate Note, 4/25/35 $ 346,511 1,700,000 A/NR DT Auto Owner Trust, 3.46%, 1/15/14 1,700,835 1,026,319 AA/NR DT Auto Owner Trust, 5.92%, 10/15/15 1,029,902 352,810 AAA/Aaa Home Equity Asset Trust, 0.75719%, 11/25/35 335,229 474,622 0.50 AAA/A1 JPMorgan Mortgage Acquisition, Floating Rate Note, 12/25/35 437,836 3,300,000 0.75 AA-/A3 Long Beach Mortgage Loan Trust, Floating Rate Note, 4/25/35 3,042,405 -------------- $ 6,892,718 - ------------------------------------------------------------------------------------------------------ Specialized Finance -- 1.5% 3,158,497 0.53 AA+/A1 Aegis Asset Backed Securities, Floating Rate Note, 3/25/12 $ 2,927,288 2,895,000 BBB-/Baa3 Dominos Pizza Master Issuer LLC, 5.261%, 4/25/37 2,970,994 5,325,000 BB/Aaa Dominos Pizza Master Issuer LLC, 7.629%, 4/25/37 5,458,125 800,000 0.96 A/A2 Irwin Home Equity Co., Floating Rate Note, 4/25/30 615,258 2,667,829 5.32 NR/Baa1 Irwin Home Equity Corp., Floating Rate Note, 6/25/35 2,578,436 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 21 Schedule of Investments | 12/31/10 (unaudited) (continued) - ----------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ----------------------------------------------------------------------------------------------------- Specialized Finance -- (continued) 1,800,000 AA/Aa3 Master Asset Backed Securities, 0.79718%, 3/25/35 $ 1,658,736 441,222 AA+/Aa1 Master Asset Backed Securities, 0.67375%, 5/25/35 429,156 908,073 0.61 AAA/Aaa New Century Home Equity Loan, Floating Rate Note, 3/25/35 822,436 900,000 0.63 AAA/Aaa SLMA 2004-10 A6B, Floating Rate Note, 4/27/26 899,280 -------------- $ 18,359,709 -------------- Total Diversified Financials $ 25,994,371 - ----------------------------------------------------------------------------------------------------- GOVERNMENT -- 0.9% Government -- 0.9% 129,126 AAA/Aaa Federal Home Loan Bank, 6.0%, 4/15/32 $ 132,378 3,743,000 AAA/Aaa FHR 3211 PB, 5.5%, 2/15/33 4,031,240 902,079 AAA/Aaa Freddie Mac, 5.0%, 8/15/35 946,014 5,000,000 NR/NR Freddie Mac REMICS, 5.0%, 6/15/33 5,330,743 304,094 AAA/Aaa Freddie Mac, 6.1%, 9/15/18 307,350 -------------- $ 10,747,725 -------------- Total Government $ 10,747,725 - ----------------------------------------------------------------------------------------------------- TOTAL ASSET BACKED SECURITIES (Cost $85,616,229) $ 85,583,272 - ----------------------------------------------------------------------------------------------------- COLLATERALIZED MORTGAGE OBLIGATIONS -- 17.0% MATERIALS -- 0.5% Forest Products -- 0.5% 1,435,000 AA/Aa3 TSTAR 2006-1 B, 5.7467%, 10/15/36 $ 1,500,670 4,470,000 AAA/Aa1 TSTAR 2006-1A A, 5.668%, 10/15/36 4,776,630 -------------- $ 6,277,300 -------------- Total Materials $ 6,277,300 - ----------------------------------------------------------------------------------------------------- BANKS -- 12.2% Thrifts & Mortgage Finance -- 12.2% 1,092,469 AAA/Aaa 321 Henderson Receivables I, 3.82%, 12/15/48 $ 1,047,080 2,450,610 5.75 NR/NR American General Mortgage Loan, Floating Rate Note, 9/25/48 2,544,799 800,000 A/NR Americold LLC Trust, 6.811%, 1/14/29 798,467 3,138,723 NR/Aaa Banc of America Alternative Loan Trust, 5.0%, 7/25/19 3,174,407 2,156,002 NR/Aa3 Banc of America Alternative Loan Trust, 5.5%, 1/25/20 2,151,621 2,535,636 NR/Aaa Banc of America Alternative Loan Trust, 5.5%, 9/25/33 2,597,437 The accompanying notes are an integral part of these financial statements. 22 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 1,467,941 AAA/Aaa Banc of America Alternative Loan Trust, 5.75%, 4/25/33 $ 1,524,630 2,592,887 NR/Aaa Banc of America Alternative Loan Trust, 6.0%, 3/25/34 2,638,571 2,787,127 A/A Banc of America Funding Corp., 0.4013%, 9/25/36 2,647,771 1,318,460 AAA/NR Banc of America Funding Corp., 5.5%, 1/25/36 1,377,558 1,607,885 AAA/Aaa Bayview Commercial Asset Trust, 0.67375%, 4/25/34 1,298,166 16,934,980 AAA/Aa1 Bayview Commercial Asset Trust, 2.65868%, 7/25/37 1,613,904 922,000 AAA/Aa2 BCAP LLC Trust, 5.0%, 11/25/36 942,072 2,317,273 2.58 AAA/Aaa Bear Stearns Adjustable Rate Mortgage, Floating Rate Note, 8/25/33 2,330,495 944,738 AAA/Aaa Chase Mortgage Finance Corp., 5.0%, 10/25/33 973,953 2,774,033 NR/Ba3 Chase Mortgage Finance Corp., 5.5%, 5/25/35 2,638,224 2,100,023 CCC/Caa1 Chase Mortgage Finance Corp., 5.5%, 5/25/37 2,050,587 2,068,087 AAA/Aaa Citigroup Commercial Mortgage, 4.639%, 5/15/43 2,089,476 961,839 AAA/Aa1 Countrywide Alternative Loan Trust, 4.25%, 4/25/34 955,399 1,026,359 AAA/AAA Countrywide Alternative Loan Trust, 5.0%, 7/25/18 1,044,444 1,618,225 AAA/A1 Countrywide Alternative Loan Trust, 5.5%, 1/25/35 1,628,345 1,698,766 AAA/Aa1 Countrywide Alternative Loan Trust, 5.5%, 4/25/34 1,708,415 6,775,507 BBB/NR Countrywide Alternative Loan Trust, 5.5%, 4/25/35 3,668,111 2,480,097 AAA/NR Countrywide Alternative Loan Trust, 5.75%, 12/25/33 2,587,068 2,115,873 0.71 AAA/NR Countrywide Alternative Loan Trust, Floating Rate Note, 8/25/18 1,967,529 2,724,156 AAA/Aaa Countrywide Home Loan Mortgage Pass Through Trust, 4.867257%, 12/25/33 2,620,330 1,955,665 B-/Ba1 Countrywide Home Loan, 4.5%, 9/25/35 1,719,309 19,831 NR/B2 CWHL 2005-16 A22, 5.5%, 9/25/35 19,307 602,030 AAA/Aaa Downey Savings & Loan, 0.83625%, 7/19/44 474,143 1,250,000 A/A2 Extended Stay America Trust, 4.8603%, 11/5/27 1,225,163 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 23 Schedule of Investments | 12/31/10 (unaudited) (continued) - ----------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ----------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 3,375,000 AAA/Aaa GMAC Commercial Mortgage Securities, Inc., 4.864%, 12/10/41 $ 3,518,671 800,000 A/A2 GMAC Commercial Mortgage Securities, Inc., 5.307%, 4/10/40 783,462 2,204,055 AAA/Aaa GS Mortgage Securities Corp. II, 7.12%, 11/18/29 2,362,843 1,142,067 0.66 NR/Aaa Impac CMB Trust, Floating Rate Note, 11/25/35 958,747 852,467 1.06 AAA/Aaa Impac Securities Assets Corp., Floating Rate Note, 11/25/34 800,566 1,476,638 0.61 AAA/Aaa Impac Securities Assets Corp., Floating Rate Note, 5/25/36 1,267,776 3,149,997 AAA/Aa3 JPMorgan Mortgage Trust, 6.0%, 8/25/34 2,912,890 1,750,000 AAA/Aaa JPMCC 2002-C3 B, 5.146%, 7/12/35 1,819,565 814,342 4.93 AAA/Aaa JPMMT 2004-A1 3A1, Floating Rate Note, 2/25/34 822,633 1,600,000 AAA/NR JPMorgan Chase Commercial Mortgage, 3.6159%, 11/15/43 1,548,871 2,800,000 A-/NR LB-UBS Commercial Mortgage, 5.616%, 10/15/35 2,720,145 25,983 AAA/Aaa LB-UBS Commercial Mortgage, 6.51%, 12/15/26 26,016 1,332,840 AAA/Aa1 Lehman Brothers Small Balance Commercial, 5.41%, 12/25/36 1,292,855 1,262,029 0.51 AAA/Aa1 Lehman Brothers Small Balance Commercial, Floating Rate Note, 2/25/30 998,581 689,080 1.11 AAA/Aa1 Lehman Brothers Small Balance, Floating Rate Note, 10/25/37 649,146 901,661 AAA/Aaa Master Adjustable Rate Mortgages Trust, 2.86771%, 4/21/34 869,263 1,727,027 BB+/B3 Master Adjustable Rate Mortgages Trust, 5.194229%, 1/25/35 1,543,357 1,744,967 AAA/NR Master Alternative Loans Trust, 4.5%, 1/25/15 1,731,857 1,418,581 AA/NR Master Alternative Loans Trust, 5.5%, 10/25/19 1,428,360 2,823,387 AAA/NR Master Alternative Loans Trust, 5.5%, 2/25/35 2,859,399 3,945,903 AAA/AAA Master Alternative Loans Trust, 6.0%, 7/25/34 4,016,574 2,323,616 6.74 BBB/NR Master Seasoned Securities Trust, Floating Rate Note, 9/25/32 2,423,625 616,630 AAA/Aaa Merrill Lynch Mortgage Trust, 4.556%, 6/12/43 624,988 The accompanying notes are an integral part of these financial statements. 24 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ----------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ----------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 1,595,858 5.44 AAA/Aaa Merrill Lynch/Countrywide Commercial, Floating Rate Note, 3/12/11 $ 1,601,076 2,630,113 AAA/A1 MLCC Mortgage Investors, Inc., 0.48344%, 3/25/30 2,358,631 1,659,374 0.49 AAA/Aaa MLCC Mortgage Investors, Inc., Floating Rate Note, 4/25/29 1,564,526 1,103,707 BBB/Baa1 RAAC Series, 6.0%, 1/25/32 1,102,416 2,039,495 AAA/NR Residential Asset Securitization Trust, 5.25%, 11/25/34 2,046,746 1,571,731 A+/NR Residential Asset Securitization Trust, 5.5%, 2/25/35 1,576,054 8,510,000 5.54 CCC+/B3 SASC 2007 BHC1 A1, Floating Rate Note, 12/18/49 1,026,306 2,890,000 5.58 D/NR SASC 2007 BHC1 A2, Floating Rate Note, 12/18/49 232,703 1,931,114 0.88 AAA/Aaa Sequoia Mortgage Trust, Floating Rate Note, 9/20/33 1,719,823 1,696,422 A/B2 Structured Asset Securities, 5.0%, 5/25/35 1,655,650 8,369,395 AAA/Aaa Wachovia Bank Commercial Mortgage Trust, 4.368%, 8/15/41 8,618,355 3,787,250 AAA/Aaa Wachovia Bank Commercial Mortgage Trust, 4.803%, 10/15/41 3,964,859 2,464,187 AAA/Aaa Wachovia Bank Commercial Mortgage Trust, 4.957%, 8/15/35 2,482,373 2,500,000 A+/NR Wachovia Bank Commercial Mortgage Trust, 5.606%, 4/15/35 2,517,100 780,286,977 AAA/Aaa Wachovia Bank Commercial Mortgage Trust, 0.015222%, 6/15/45 1,139,843 2,723,280 AAA/NR WaMu Mortgage Pass Through Certificates, 2.73272%, 1/25/35 2,654,432 417,531 BB/NR WaMu Mortgage Pass Through Certificates, 2.77149%, 9/25/35 373,000 633,181 BB/NR WaMu Mortgage Pass Through Certificates, 4.82069%, 9/25/35 630,601 2,313,191 0.49 AAA/Caa1 WaMu Mortgage Pass Through Certificates, Floating Rate Note, 4/25/45 1,936,974 1,450,000 AAA/Aaa WBCMT 2003-C9 B, 5.109%, 12/15/35 1,476,887 3,878,867 AAA/Aa1 Wells Fargo Commercial Mortgage Backed Securities, 3.349%, 10/15/57 3,886,349 1,532,354 AAA/A1 Wells Fargo Mortgage Backed Securities, 5.0%, 11/25/36 1,531,634 1,702,205 NR/B2 Wells Fargo Mortgage Backed Securities, 5.0%, 3/25/21 1,699,013 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 25 Schedule of Investments | 12/31/10 (unaudited) (continued) - ------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 1,928,825 AAA/Baa1 Wells Fargo Mortgage Backed Securities, 5.5%, 5/25/35 $ 1,943,104 785,535 2.85 AAA/Aa1 Wells Fargo Mortgage Backed Securities, Floating Rate Note, 10/25/34 778,850 796,578 2.89 AAA/Aa1 Wells Fargo Mortgage Backed Securities, Floating Rate Note, 10/25/35 778,791 831,401 4.53 AAA/Aaa Wells Fargo Mortgage Backed Securities, Floating Rate Note, 11/25/33 847,492 1,819,315 5.64 A-/NR Wells Fargo Mortgage Backed Securities, Floating Rate Note, 4/25/36 1,796,224 342,505 4.53 AAA/Aa1 Wells Fargo Mortgage Backed Securities, Floating Rate Note, 6/25/34 336,147 2,098,678 4.77 AAA/Aaa WFMBS 2004-L A6, Floating Rate Note, 7/25/34 2,108,760 -------------- $ 148,421,690 -------------- Total Banks $ 148,421,690 - ------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 3.7% Asset Management & Custody Banks -- 0.1% 986,008 5.35 NR/NR Jefferies & Co., Inc., Floating Rate Note, 5/26/37 $ 968,444 - ------------------------------------------------------------------------------------------------------- Consumer Finance -- 0.1% 1,390,677 AAA/Aaa GMAC Mortgage Corp. Loan Trust, 5.5%, 11/25/33 $ 1,449,507 - ------------------------------------------------------------------------------------------------------- Diversified Financial Services -- 2.8% 1,794,682 AAA/NR Banc of America Mortgage Securities, 5.0%, 8/25/33 $ 1,794,796 2,116,904 AA-/NR Banc of America Mortgage Securities, 5.5%, 11/25/34 2,186,675 709,002 AAA/NR Banc of America Mortgage Securities, 5.75%, 1/25/35 733,886 1,487,080 3.23 AAA/Aaa Banc of America Mortgage Securities, Floating Rate Note, 10/25/33 1,469,962 3,944,080 3.22 NR/Aaa Banc of America Mortgage Securities, Floating Rate Note, 11/25/33 3,823,754 2,075,992 2.94 NR/Ba3 Banc of America Mortgage Securities, Floating Rate Note, 5/25/35 2,050,152 1,940,270 2.92 AAA/Aaa Banc of America Mortgage Securities, Floating Rate Note, 7/25/33 1,899,078 1,182,078 5.12 AAA/NR Banc of America Mortgage Securities, Floating Rate Note, 9/25/35 1,134,001 1,405,400 NR/A2 Citicorp Mortgage Securities, Inc., 5.5%, 3/25/35 1,444,216 1,458,214 NR/B1 CMSI 2006-1 3A1, 5.0%, 2/25/36 1,452,813 The accompanying notes are an integral part of these financial statements. 26 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------- Diversified Financial Services -- (continued) 2,056,731 CCC/NR JPMorgan Alternative Loan Trust, 6.0%, 3/25/36 $ 1,728,561 749,890 3.75 NR/NR La Hipotecaria SA, Floating Rate Note, 9/8/39 763,013 1,400,559 A+/Aaa MLMI 2005-A2 A4, 4.48%, 2/25/35 1,406,102 249,137 AAA/Aaa Morgan Stanley Capital, Inc., 7.0%, 7/25/33 254,438 2,681,103 5.50 AAA/Baa1 RALI 2004-QS16 1A1, Floating Rate Note, 12/25/34 2,634,430 2,326,833 NR/Aaa Residential Accredit Loans, Inc., 5.0%, 8/25/18 2,329,636 1,028,458 0.45 B-/Caa3 Residential Accredit Loans, Inc., Floating Rate Note, 5/25/47 641,426 4,843,285 NR/Aaa Residential Accredit, 5.0%, 5/25/19 4,966,431 768,030 AAA/NR Residential Accredit, 6.0%, 10/25/34 776,930 308,398 NR/NR Vericrest Opportunity Loan Trust, 4.25%, 5/25/39 308,398 -------------- $ 33,798,698 - ------------------------------------------------------------------------------------------------------- Investment Banking & Brokerage -- 0.6% 1,440,000 AAA/Aaa Banc of America Commercial Mortgage, Inc., 4.877%, 7/10/42 $ 1,525,155 1,021,614 5.51 NR/Aaa Bear Stearns Commercial Mortgage, Floating Rate Note, 4/12/38 1,023,978 3,080,000 AA/NR Bear Stearns Commercial Mortgage Securities, 6.63%, 2/15/35 3,096,843 1,600,000 7.12 BBB+/Baa2 Bear Stearns Commercial Mortgage Securities, Floating Rate Note, 10/15/36 1,594,902 -------------- $ 7,240,878 - ------------------------------------------------------------------------------------------------------- Specialized Finance -- 0.1% 728,137 AAA/NR CW Capital Cobalt, Ltd., 5.174%, 8/15/48 $ 742,114 -------------- Total Diversified Financials $ 44,199,641 - ------------------------------------------------------------------------------------------------------- REAL ESTATE -- 0.5% Mortgage Real Estate Investment Trusts -- 0.5% 942,302 AAA/Aaa Credit Suisse First Boston Mortgage Securities Corp., 6.51%, 2/15/34 $ 941,833 674,488 AA/Aa2 Credit Suisse First Boston Mortgage Securities Corp., 7.0%, 5/25/32 429,441 675,000 A+/Baa2 Credit Suisse First Boston Mortgage Securities Corp., 7.165%, 12/15/35 674,314 2,304,191 1.61 AA+/Aa2 Credit Suisse First Boston Mortgage Securities Corp., Floating Rate Note, 12/25/33 2,192,629 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 27 Schedule of Investments | 12/31/10 (unaudited) (continued) - ------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------- Mortgage Real Estate Investment Trusts -- (continued) 400,000 4.52 A-/A3 Credit Suisse First Boston Mortgage Securities Corp., Floating Rate Note, 5/15/38 $ 371,694 1,537,333 1.76 AA+/Aa2 Credit Suisse First Boston Mortgage Securities Corp., Floating Rate Note, 8/25/33 1,445,007 -------------- $ 6,054,918 -------------- Total Real Estate $ 6,054,918 - ------------------------------------------------------------------------------------------------------- GOVERNMENT -- 0.1% Government -- 0.1% 1,236,470 AAA/A2 GSR Mortgage Loan Trust, 4.1408%, 6/25/34 $ 1,246,329 -------------- Total Government $ 1,246,329 - ------------------------------------------------------------------------------------------------------- TOTAL COLLATERALIZED MORTGAGE OBLIGATIONS (Cost $216,746,465) $ 206,199,878 - ------------------------------------------------------------------------------------------------------- CORPORATE BONDS -- 41.0% ENERGY -- 4.3% Integrated Oil & Gas -- 0.2% 1,200,000 A/A2 BP Capital Markets Plc, 5.25%, 11/7/13 $ 1,299,616 990,000 BBB+/Baa1 Marathon Oil Corp., 5.9%, 3/15/18 1,122,484 45,000 BBB+/Baa2 Petro-Canada, 4.0%, 7/15/13 47,350 -------------- $ 2,469,450 - ------------------------------------------------------------------------------------------------------- Oil & Gas Drilling -- 0.1% 1,025,000 BBB-/Ba1 Pride International, 6.875%, 8/15/20 $ 1,063,438 - ------------------------------------------------------------------------------------------------------- Oil & Gas Equipment & Services -- 0.4% 900,000 3.44 NR/NR Sevan Marine ASA, Floating Rate Note, 5/14/13 (144A) $ 769,500 2,815,000 BBB/Baa2 Weatherford International, Ltd., 9.625%, 3/1/19 3,612,171 -------------- $ 4,381,671 - ------------------------------------------------------------------------------------------------------- Oil & Gas Exploration & Production -- 1.1% 2,180,000 BBB/Baa1 Canadian Natural Resources, 5.9%, 2/1/18 $ 2,482,809 1,020,000 BB/Ba3 Chesapeake Energy Corp., 9.5%, 2/15/15 1,150,050 2,292,000 BB/B1 Denbury Resources, Inc., 8.25%, 2/15/20 2,486,820 160,000 BB/B1 Denbury Resources, Inc., 9.75%, 3/1/16 178,400 1,570,996 BBB+/NR Gazprom International SA, 7.201%, 2/1/20 RegS 1,669,183 1,431,981 A/Aa2 Ras Laffan Liquefied Natural Gas Co., Ltd., III, 5.832%, 9/30/16 (144A) (b) 1,539,380 The accompanying notes are an integral part of these financial statements. 28 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------- Oil & Gas Exploration & Production -- (continued) 1,000,000 BBB-/Baa2 TNK-BP Finance SA, 6.625%, 3/20/17 (144A) $ 1,062,500 2,080,000 BBB-/Baa2 TNK-BP Finance SA, 7.5%, 7/18/16 (144A) 2,306,200 1,000,000 BBB-/Baa2 TNK-BP Finance SA, 7.875%, 3/13/18 (144A) 1,133,800 -------------- $ 14,009,142 - ------------------------------------------------------------------------------------------------------ Oil & Gas Refining & Marketing -- 0.6% 1,150,000 B+/B1 Holly Energy Partners LP, 6.25%, 3/1/15 $ 1,138,500 100,000 B/B2 Petroplus Finance, Ltd., 7.0%, 5/1/17 (144A) 88,500 2,475,000 BBB/Baa2 Spectra Energy Capital, 6.2%, 4/15/18 2,748,893 2,890,000 BBB/Baa2 Valero Energy Corp., 9.375%, 3/15/19 3,587,302 -------------- $ 7,563,195 - ------------------------------------------------------------------------------------------------------ Oil & Gas Storage & Transportation -- 1.9% 435,000 BBB-/Baa2 Boardwalk Pipelines LLC, 5.5%, 2/1/17 $ 462,171 1,535,000 BBB/Baa2 Buckeye Partners LP, 6.05%, 1/15/18 1,694,081 2,900,000 BBB/Baa2 DCP Midstream, 9.75%, 3/15/19 3,747,728 3,250,000 BBB/Baa2 Kinder Morgan Energy, 5.95%, 2/15/18 3,579,271 1,450,000 BBB-/Ba1 NGPL Pipeco LLC, 6.514%, 12/15/12 (144A) 1,565,000 3,500,000 BBB-/Baa3 Plains All America Pipeline, 6.125%, 1/15/17 3,842,916 3,885,000 A/A3 Questar Pipeline Co., 5.83%, 2/1/18 4,292,921 2,000,000 BB/Ba1 Southern Union Co., 7.2%, 11/1/66 1,842,500 1,500,000 BBB/Baa2 Spectra Energy Capital LLC, 6.75%, 7/15/18 1,655,384 -------------- $ 22,681,972 -------------- Total Energy $ 52,168,868 - ------------------------------------------------------------------------------------------------------ MATERIALS -- 2.8% Aluminum -- 0.2% 2,425,000 BBB-/Baa3 Alcoa, Inc., 6.15%, 8/15/20 $ 2,490,235 - ------------------------------------------------------------------------------------------------------ Commodity Chemicals -- 0.2% 1,700,000 B+/B1 Nova Chemicals Corp., 8.375%, 11/1/16 $ 1,810,500 - ------------------------------------------------------------------------------------------------------ Construction Materials -- 0.2% 2,260,000 6.64 B-/NR C8 Capital SPV, Ltd., Floating Rate Note, 12/31/49 $ 1,576,264 475,000 BBB/Baa2 Holcim, Ltd., 6.0%, 12/30/19 (144A) 493,261 -------------- $ 2,069,525 - ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 29 Schedule of Investments | 12/31/10 (unaudited) (continued) - ------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------- Diversified Metals & Mining -- 0.8% 3,085,000 BBB-/Baa3 AngloGold Ashanti Holdings, 5.375%, 4/15/20 $ 3,208,400 5,000,000 BBB-/Baa3 Gold Fields Orogen Holding BVI, 4.875%, 10/7/20 4,783,170 950,000 BBB/Baa2 Teck Resources, Ltd., 10.25%, 5/15/16 1,175,625 -------------- $ 9,167,195 - ------------------------------------------------------------------------------------------------------- Fertilizers & Agricultural Chemicals -- 0.5% 4,368,000 BBB/Baa2 Agrium, Inc., 6.75%, 1/15/19 $ 4,991,418 1,500,000 BB+/B1 CF Industries Holdings, Inc., 6.875%, 5/1/18 1,605,000 45,000 A-/Baa1 Potash Corp. Saskatchewan, 4.875%, 3/1/13 47,917 -------------- $ 6,644,335 - ------------------------------------------------------------------------------------------------------- Paper Products -- 0.1% 1,350,000 BBB/Ba2 Georgia-Pacific LLC, 5.4%, 11/1/20 $ 1,334,717 - ------------------------------------------------------------------------------------------------------- Specialty Chemicals -- 0.2% 2,400,000 BBB/Baa2 Cytec Industries, Inc., 8.95%, 7/1/17 $ 2,918,155 - ------------------------------------------------------------------------------------------------------- Steel -- 0.6% 3,900,000 BBB-/Baa3 ArcelorMittal, 6.125%, 6/1/18 $ 4,155,399 2,805,000 BBB-/Baa3 Commercial Metals Co., 7.35%, 8/15/18 2,853,860 -------------- $ 7,009,259 -------------- Total Materials $ 33,443,921 - ------------------------------------------------------------------------------------------------------- CAPITAL GOODS -- 3.2% Aerospace & Defense -- 0.3% 3,020,000 BB/Ba3 Esterline Tech, 6.625%, 3/1/17 $ 3,050,200 - ------------------------------------------------------------------------------------------------------- Building Products -- 0.5% 2,225,000 6.72 B-/BBB- C10 Capital SPV, Ltd., Floating Rate Note, 12/31/49 $ 1,552,431 4,260,000 BBB/Ba2 Masco Corp., 7.125%, 3/15/20 4,456,505 -------------- $ 6,008,936 - ------------------------------------------------------------------------------------------------------- Construction & Farm Machinery & Heavy Trucks -- 0.2% 910,000 BBB+/Baa2 Cummins, Inc., 6.75%, 2/15/27 $ 949,108 600,000 BB-/B2 Oshkosh Corp., 8.5%, 3/1/20 658,500 -------------- $ 1,607,608 - ------------------------------------------------------------------------------------------------------- Electrical Components & Equipment -- 0.4% 2,665,000 BB/Ba2 Anixter International Corp., 5.95%, 3/1/15 $ 2,668,331 2,670,000 B+/Ba2 Belden CDT, Inc., 7.0%, 3/15/17 2,703,375 -------------- $ 5,371,706 - ------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 30 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ---------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ---------------------------------------------------------------------------------------------------- Industrial Conglomerates -- 0.6% 3,500,000 A/A2 Cargill, Inc., 5.2%, 1/22/13 (144A) $ 3,776,077 2,950,000 BBB/Baa2 Tyco Electronics Group SA, 6.55%, 10/1/17 (b) 3,352,424 525,000 A-/Baa1 Tyco International Finance SA, 8.5%, 1/15/19 671,992 -------------- $ 7,800,493 - ---------------------------------------------------------------------------------------------------- Industrial Machinery -- 0.4% 2,150,000 BBB+/Baa1 Ingersoll-Rand Global Holdings, 9.5%, 4/15/14 $ 2,590,131 1,810,000 BBB-/Ba1 Valmont Industries, Inc., 6.625%, 4/20/20 1,882,918 -------------- $ 4,473,049 - ---------------------------------------------------------------------------------------------------- Trading Companies & Distributors -- 0.8% 495,000 BB-/Ba2 Ace Hardware Corp., 9.125%, 6/1/16 (144A) $ 529,650 5,660,000 BBB/Baa1 GATX Financial Corp., 6.0%, 2/15/18 6,041,048 3,450,000 BBB-/Baa2 Glencore Funding LLC, 6.0%, 4/15/14 (144A) 3,645,953 -------------- $ 10,216,651 -------------- Total Capital Goods $ 38,528,643 - ---------------------------------------------------------------------------------------------------- COMMERCIAL SERVICES & SUPPLIES -- 0.3% Office Services & Supplies -- 0.3% 3,110,000 BBB+/A2 Pitney Bowes, Inc., 5.6%, 3/15/18 $ 3,214,891 -------------- Total Commercial Services & Supplies $ 3,214,891 - ---------------------------------------------------------------------------------------------------- TRANSPORTATION -- 0.3% Airlines -- 0.1% 799,825 BBB+/Baa2 Southwest Airlines Co., 7.67%, 1/2/14 $ 833,737 - ---------------------------------------------------------------------------------------------------- Railroads -- 0.2% 2,140,000 BBB+/A3 Burlington Northern Santa Fe Corp., 5.75%, 3/15/18 $ 2,411,234 -------------- Total Transportation $ 3,244,971 - ---------------------------------------------------------------------------------------------------- AUTOMOBILES & COMPONENTS -- 0.1% Automobile Manufacturers -- 0.1% 655,000 BBB/Baa2 Hyundai Motor Manufacturer, 4.5%, 4/15/15 $ 672,105 790,000 BBB+/Baa2 Nissan Motor Acceptance Corp., 4.5%, 1/30/15 (144A) 820,281 -------------- $ 1,492,386 -------------- Total Automobiles & Components $ 1,492,386 - ---------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 31 Schedule of Investments | 12/31/10 (unaudited) (continued) - ------------------------------------------------------------------------------------------------------ Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------ CONSUMER DURABLES & APPAREL -- 0.4% Household Appliances -- 0.4% 4,235,000 BBB-/Baa3 Whirlpool Corp., 5.5%, 3/1/13 $ 4,497,714 -------------- Total Consumer Durables & Apparel $ 4,497,714 - ------------------------------------------------------------------------------------------------------ CONSUMER SERVICES -- 0.8% Casinos & Gaming -- 0.0% 1,160,000 NR/WD Station Casinos, 6.625%, 3/15/18 (e) $ 116 - ------------------------------------------------------------------------------------------------------ Education Services -- 0.7% 2,160,000 AAA/Aaa Leland Stanford Junior University, 4.75%, 5/1/19 $ 2,319,473 2,470,000 AAA/Aaa President & Fellows of Harvard, 3.7%, 4/1/13 2,616,693 3,095,000 AAA/Aaa President & Fellows of Harvard, 6.3%, 10/1/37 3,347,954 -------------- $ 8,284,120 - ------------------------------------------------------------------------------------------------------ Restaurants -- 0.1% 1,200,000 A/A2 McDonald's Corp., 5.35%, 3/1/18 $ 1,346,413 -------------- Total Consumer Services $ 9,630,649 - ------------------------------------------------------------------------------------------------------ MEDIA -- 0.7% Broadcasting -- 0.6% 2,620,000 BBB+/Baa1 Grupo Telivisa SA, 6.0%, 5/15/18 (144A) $ 2,882,204 4,250,000 B+/B3 Intelsat Subsidiary Holding Co., 8.5%, 1/15/13 4,255,313 -------------- $ 7,137,517 - ------------------------------------------------------------------------------------------------------ Cable & Satellite -- 0.1% 800,000 BBB/Baa2 Time Warner Cable, Inc., 8.25%, 4/1/19 $ 993,738 425,000 BBB/Baa2 Time Warner Cable, Inc., 8.75, 2/14/19 540,799 -------------- $ 1,534,537 -------------- Total Media $ 8,672,054 - ------------------------------------------------------------------------------------------------------ RETAILING -- 0.3% Internet Retail -- 0.3% 800,000 BBB-/Ba1 Expedia, Inc., 5.95%, 8/15/20 $ 804,000 3,000,000 BBB-/Ba1 Expedia, Inc., 8.5%, 7/1/16 (144A) 3,285,000 -------------- $ 4,089,000 -------------- Total Retailing $ 4,089,000 - ------------------------------------------------------------------------------------------------------ FOOD & DRUG RETAILING -- 0.1% Drug Retail -- 0.1% 1,555,000 BBB+/Baa2 CVS Pass-Through Trust, 5.773%, 1/31/33 $ 1,542,062 -------------- Total Food & Drug Retailing $ 1,542,062 - ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 32 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------- FOOD, BEVERAGE & TOBACCO -- 1.2% Agricultural Products -- 0.4% 5,175,000 BBB-/Ba1 Viterra, Inc., 5.95%, 8/1/20 $ 4,937,711 - ------------------------------------------------------------------------------------------------------- Brewers -- 0.3% 2,930,000 BBB+/Baa2 Anheuser-Busch InBev Worldwide, Inc., 7.75%, 1/15/19 (144A) $ 3,645,940 55,000 BBB+/Baa1 Miller Brewing Co., 5.5%, 8/15/13 (144A) 59,697 -------------- $ 3,705,637 - ------------------------------------------------------------------------------------------------------- Packaged Foods & Meats -- 0.4% 3,725,000 BBB-/Baa2 Kraft Foods, Inc., 6.5%, 2/9/40 $ 4,174,343 - ------------------------------------------------------------------------------------------------------- Tobacco -- 0.1% 1,535,000 BBB/WD UST, Inc., 5.75%, 3/1/18 $ 1,639,300 -------------- Total Food, Beverage & Tobacco $ 14,456,991 - ------------------------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 0.4% Health Care Facilities -- 0.1% 1,050,000 BB/Ba3 HCA, Inc., 7.875%, 2/15/20 $ 1,123,500 385,000 BB/Ba3 HCA, Inc., 8.5%, 4/15/19 421,575 310,000 BB-/B2 HCA, Inc., 9.875%, 2/15/17 341,000 -------------- $ 1,886,075 - ------------------------------------------------------------------------------------------------------- Managed Health Care -- 0.3% 3,275,000 A-/Baa1 United Health Group, 4.875%, 2/15/13 $ 3,486,709 -------------- Total Health Care Equipment & Services $ 5,372,784 - ------------------------------------------------------------------------------------------------------- PHARMACEUTICALS & BIOTECHNOLOGY -- 0.9% Biotechnology -- 0.3% 3,555,000 BBB+/Baa3 Biogen Idec, Inc., 6.0%, 3/1/13 $ 3,839,770 - ------------------------------------------------------------------------------------------------------- Life Sciences Tools & Services -- 0.5% 5,366,000 BBB-/Baa3 Agilent Technologies, Inc., 6.5%, 11/1/17 $ 5,947,406 ---------- --------- ---------------------------------------------------------- Pharmaceuticals -- 0.1% 1,000,000 AA/A1 Abbott Laboratories, 5.125%, 4/1/19 $ 1,101,064 -------------- Total Pharmaceuticals & Biotechnology $ 10,888,240 - ------------------------------------------------------------------------------------------------------- BANKS -- 4.7% Diversified Banks -- 1.2% 3,515,000 A/Baa1 Barclays Plc, 6.05%, 12/4/17 $ 3,605,698 3,400,000 AA-/Aa3 BNP Paribas, 1.34438%, 4/27/17 3,274,849 3,230,000 A-/A3 Credit Agricole SA, 8.375%, 12/13/49 3,318,825 1,855,000 A/A1 Industrial Bank of Korea, 7.125%, 4/23/14 2,082,356 2,000,000 3.05 A-/NR Scotiabank Peru SA, Floating Rate Note, 3/15/17 (144A) 2,007,200 -------------- $ 14,288,928 - ------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 33 Schedule of Investments | 12/31/10 (unaudited) (continued) - ------------------------------------------------------------------------------------------------------ Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------ Regional Banks -- 3.5% 1,870,000 BBB+/A2 American Express Bank FSB, 5.5%, 4/16/13 $ 2,015,473 2,000,000 A/A2 Branch Banking & Trust Co., 4.875%, 1/15/13 (b) 2,123,964 1,190,000 A/NR Cobank ACB, 7.875%, 4/16/18 (144A) 1,322,887 2,425,000 BBB+/Baa1 KeyBank NA, 5.8%, 7/1/14 2,598,414 2,030,000 BBB+/Baa1 Keycorp, 6.5%, 5/14/13 2,204,001 2,505,000 A+/Aa3 Mellon Funding Corp., 5.5%, 11/15/18 2,723,669 1,435,000 A/A3 PNC Bank NA, 6.0%, 12/7/17 1,560,811 6,273,000 8.25 BBB/Baa3 PNC Financial Services Group, Floating Rate Note, 5/29/49 (b) 6,688,837 1,500,000 8.70 BBB/Baa3 PNC Preferred Funding Trust III, Floating Rate Note, 3/29/49 1,592,655 2,755,000 A-/Baa1 Sovereign Bancorp, 8.75%, 5/30/18 3,004,176 6,670,000 BBB+/Baa1 State Street Capital, 8.25%, 3/15/42 6,776,720 3,520,000 AA-/Aa3 Wachovia Bank NA, 6.0%, 11/15/17 3,905,317 5,470,000 7.70 A-/Baa3 Wells Fargo & Co., Floating Rate Note, 12/29/49 (b) 5,654,613 -------------- $ 42,171,537 -------------- Total Banks $ 56,460,465 - ------------------------------------------------------------------------------------------------------ DIVERSIFIED FINANCIALS -- 8.1% Asset Management & Custody Banks -- 1.1% 2,000,000 A+/Aa3 Bank of New York, 4.95%, 3/15/15 $ 2,171,004 3,945,000 A-/A3 Eaton Vance Corp., 6.5%, 10/2/17 4,472,048 5,400,000 BB+/Baa3 Janus Capital Group, Inc., 6.95%, 6/15/17 5,625,866 -------------- $ 12,268,918 - ------------------------------------------------------------------------------------------------------ Consumer Finance -- 1.6% 4,435,000 B/B3 American General Finance, 6.9%, 12/15/17 $ 3,581,263 3,875,000 A+/A1 American Honda Finance, 6.7%, 10/1/13 (144A) 4,383,892 1,765,000 BBB/Baa1 Capital One Bank USA NA, 8.8%, 7/15/19 2,171,019 3,335,000 BB/Baa3 Capital One Capital VI, 8.875%, 5/15/40 3,472,569 2,575,000 A/A2 Caterpillar Financial, 7.05%, 10/1/18 3,114,805 3,155,000 4.00 BBB-/Ba1 SLM Corp., Floating Rate Note, 7/25/14 2,865,245 -------------- $ 19,588,793 - ------------------------------------------------------------------------------------------------------ Diversified Financial Services -- 2.3% 3,800,000 BBB/Baa2 Alterra Finance LLC, 6.25%, 9/30/20 $ 3,772,948 625,000 0.00 BB+/NR Caelus Re II, Ltd., Floating Rate Note, 5/24/13 630,625 The accompanying notes are an integral part of these financial statements. 34 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ---------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ---------------------------------------------------------------------------------------------------- Diversified Financial Services -- (continued) 3,015,000 NR/A2 Crown Castle Towers LLC, 4.883%, 8/15/20 $ 2,897,659 1,625,000 NR/A2 Crown Castle Towers LLC, 6.113%, 1/15/20 1,695,397 1,840,000 BBB+/Baa2 Hyundai Capital Services, Inc., 6.0%, 5/5/15 1,991,737 2,575,000 A+/Aa3 JPMorgan Chase & Co., 6.0%, 1/15/18 2,875,621 5,890,000 BBB+/Baa1 JPMorgan Chase & Co., 7.9%, 4/29/49 6,261,011 1,400,000 BB+/NR Lodestone Re, Ltd., 0.0%, 5/17/13 (144A) 1,401,960 2,400,000 BB+/NR Lodestone Re, Ltd., 0.0%, 1/8/14 2,398,320 1,100,000 A-/A3 Nationsbank Corp., 7.75%, 8/15/15 1,228,726 798,880 A-/Baa1 PF Export Receivable Master Trust, 6.436%, 6/1/15 (144A) 878,768 760,368 BBB/Baa2 Power Receivables Finance, LLC 6.29%, 1/1/12 (144A) 760,786 1,250,000 0.00 BB/NR Residential Reinsurance 2010 LLC, Floating Rate Note, 6/6/13 (144A) 1,246,875 -------------- $ 28,040,433 - ---------------------------------------------------------------------------------------------------- Investment Banking & Brokerage -- 2.3% 700,000 BBB-/NR Alta Wind Holdings, Ltd., 7.0%, 6/30/35 (144A) $ 746,592 11,040,000 5.79 BBB-/Baa2 Goldman Sachs Capital, Floating Rate Note, 12/29/49 9,356,400 2,000,000 A/A1 Goldman Sachs, 5.5%, 11/15/14 2,162,910 3,125,000 BBB/Baa2 Jefferies Group, Inc., 6.875%, 4/15/21 3,247,722 2,730,000 A-/A2 Macquarie Group, Ltd., 6.0%, 1/14/20 2,740,693 3,325,000 A/A2 Merrill Lynch & Co., 5.45%, 2/5/13 3,507,190 2,765,000 A/A2 Morgan Stanley Dean Witter, 6.625%, 4/1/18 2,999,386 3,125,000 A/A2 Morgan Stanley, 5.5%, 1/26/20 3,150,078 -------------- $ 27,910,971 - ---------------------------------------------------------------------------------------------------- Specialized Finance -- 0.8% 2,900,000 BBB+/Baa2 BM&FBovespa SA, 5.5%, 7/16/20 $ 2,950,936 4,680,000 BBB/Baa3 Cantor Fitzgerald LP, 7.875%, 10/15/19 4,819,572 2,000,000 A+/A1 National Rural Utilities Corp., 5.45%, 2/1/18 2,209,046 -------------- $ 9,979,554 -------------- Total Diversified Financials $ 97,788,669 - ---------------------------------------------------------------------------------------------------- INSURANCE -- 4.1% Insurance Brokers -- 0.1% 1,560,000 BB+/B1 Leucadia National, 7.125%, 3/15/17 (144A) $ 1,606,800 - ---------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 35 Schedule of Investments | 12/31/10 (unaudited) (continued) - -------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - -------------------------------------------------------------------------------------------------------- Life & Health Insurance -- 1.8% 850,000 BBB/Baa3 Delphi Financial Group, Inc., 7.875%, 1/31/20 $ 908,062 3,380,000 BBB/Ba1 Lincoln National Corp., 6.05%, 4/20/67 3,118,050 1,690,000 A-/Baa2 Lincoln National Corp., 8.75%, 7/1/19 2,113,933 4,200,000 BBB/Baa2 MetLife, Inc., 10.75%, 8/1/39 5,628,000 4,250,000 A-/Baa2 Protective Life Corp., 7.375%, 10/15/19 4,601,148 2,800,000 A/Baa2 Prudential Financial, Inc., 5.15%, 1/15/13 2,986,463 2,140,000 BBB+/Baa3 Prudential Financial, Inc., 8.875%, 6/15/38 2,487,750 -------------- $ 21,843,406 - -------------------------------------------------------------------------------------------------------- Multi-Line Insurance -- 1.0% 650,000 BBB/Baa3 Genworth Financial, Inc., 7.2%, 2/15/21 $ 665,352 4,620,000 BB/Baa3 Liberty Mutual Group, 7.0%, 3/15/37 (144A) 4,149,961 3,035,000 BBB-/Baa2 Liberty Mutual Group, 7.3%, 6/15/14 (144A) 3,318,930 650,000 10.75 BB/Baa3 Liberty Mutual Group, Floating Rate Note, 6/15/58 (144A) 786,500 2,650,000 A/A3 Loew Corp., 5.25%, 3/15/16 2,873,538 -------------- $ 11,794,281 - -------------------------------------------------------------------------------------------------------- Property & Casualty Insurance -- 0.7% 5,000,000 BBB-/Baa3 Hanover Insurance Group, 7.625%, 10/15/25 $ 5,011,430 700,000 BBB-/Baa3 The Hanover Insurance Group, Inc., 7.5%, 3/1/20 737,626 2,000,000 A-/A2 Travelers Cos., Inc., 6.25%, 6/15/37 2,222,656 -------------- $ 7,971,712 - -------------------------------------------------------------------------------------------------------- Reinsurance -- 0.5% 250,000 8.92 BB/NR Caelus Re, Ltd., Floating Rate Note, 6/7/11 $ 251,225 600,000 0.00 BB+/A2 Foundation Re III, Ltd., Floating Rate Note, 2/3/14 597,120 5,048,000 BBB+/BBB+ Platinum Underwriters HD, 7.5%, 6/1/17 5,251,384 -------------- $ 6,099,729 -------------- Total Insurance $ 49,315,928 - -------------------------------------------------------------------------------------------------------- REAL ESTATE -- 3.3% Diversified Real Estate Activities -- 0.4% 4,125,000 A-/A2 WEA Finance LLC, 7.125%, 4/15/18 $ 4,745,276 - -------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 36 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ----------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ----------------------------------------------------------------------------------------------------- Diversified Real Estate Investment Trusts -- 0.7% 5,125,000 BBB+/Baa1 Dexus Finance Pty, Ltd., 7.125%, 10/15/14 $ 5,658,072 1,765,000 BBB/Baa2 Digital Realty Trust LP, 4.5%, 7/15/15 (144A) 1,775,871 725,000 BBB/Baa2 Digital Realty Trust LP, 5.875%, 2/1/20 737,581 -------------- $ 8,171,524 - ----------------------------------------------------------------------------------------------------- Office Real Estate Investment Trusts -- 0.2% 692,000 BBB/Baa2 Mack-Cali Realty LP, 5.125%, 1/15/15 $ 724,831 1,607,000 BBB/Baa2 Mack-Cali Realty LP, 5.125%, 2/15/14 1,697,387 -------------- $ 2,422,218 - ----------------------------------------------------------------------------------------------------- Real Estate Operating Companies -- 0.0% 180,000 B-/B3 Forest City Enterprises, 7.625%, 6/1/15 $ 168,300 - ----------------------------------------------------------------------------------------------------- Retail Real Estate Investment Trusts -- 0.3% 2,905,000 BB/Baa3 Developers Diversified Realty, 7.5%, 4/1/17 $ 3,245,149 - ----------------------------------------------------------------------------------------------------- Specialized Real Estate Investment Trusts -- 1.7% 4,125,000 BBB-/Baa2 Health Care REIT, Inc., 6.2%, 6/1/16 $ 4,564,333 860,000 BBB-/Baa2 Health Care, Inc., 6.0%, 11/15/13 941,576 2,425,000 BBB-/Baa3 Healthcare Realty Trust, Inc., 6.5%, 1/17/17 2,615,234 5,325,000 BBB-/Baa2 Hospitality Properties Trust, 7.875%, 8/15/14 5,889,935 4,285,000 BBB-/Baa3 Senior Housing Properties Trust, 6.75%, 4/15/20 4,526,031 540,000 BBB-/Baa3 Ventas Realty LP/CAP Corp., 6.75%, 4/1/17 565,810 1,910,000 BBB-/Baa3 Ventas Realty LP/V, 6.5%, 6/1/16 1,986,305 -------------- $ 21,089,224 -------------- Total Real Estate $ 39,841,691 - ----------------------------------------------------------------------------------------------------- SOFTWARE & SERVICES -- 0.6% Data Processing & Outsourced Services -- 0.1% 447,000 B-/Caa1 First Data Corp., 12.625%, 1/15/21 $ 426,885 447,000 B-/Caa1 First Data Corp., 8.25%, 1/15/21 (b) 429,120 101,000 B-/Caa1 First Data Corp., 9.875%, 9/24/15 96,203 -------------- $ 952,208 - ----------------------------------------------------------------------------------------------------- Internet Software & Services -- 0.3% 3,950,000 NR/Ba2 GTP Towers Issuer LLC, 4.436%, 2/15/15 (144A) $ 4,083,087 - ----------------------------------------------------------------------------------------------------- Systems Software -- 0.2% 1,800,000 A/A2 Oracle Corp., 5.75%, 4/15/18 $ 2,059,101 -------------- Total Software & Services $ 7,094,396 - ----------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 37 Schedule of Investments | 12/31/10 (unaudited) (continued) - ---------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ---------------------------------------------------------------------------------------------------- TECHNOLOGY HARDWARE & EQUIPMENT -- 0.2% Communications Equipment -- 0.1% 497,000 BBB-/Ba2 Brocade Communications Systems, 6.625%, 1/15/18 $ 523,093 497,000 BBB-/Ba2 Brocade Communications Systems, 6.875%, 1/15/20 529,305 -------------- $ 1,052,398 - ---------------------------------------------------------------------------------------------------- Computer Hardware -- 0.1% 1,700,000 A/A2 Hewlett-Packard Co., 4.5%, 3/1/13 $ 1,819,612 -------------- Total Technology Hardware & Equipment $ 2,872,010 - ---------------------------------------------------------------------------------------------------- SEMICONDUCTORS -- 0.3% Semiconductor Equipment -- 0.3% 3,140,000 BBB/Baa1 Klac Instruments Corp., 6.9%, 5/1/18 $ 3,454,019 -------------- Total Semiconductors $ 3,454,019 - ---------------------------------------------------------------------------------------------------- TELECOMMUNICATION SERVICES -- 0.5% Integrated Telecommunication Services -- 0.5% 1,200,000 A-/A2 AT&T, Inc., 5.6%, 5/15/18 $ 1,338,893 2,530,000 B+/B2 Cincinnati Bell, Inc., 8.25%, 10/15/17 2,504,700 580,000 B+/B2 Cincinnati Bell, Inc., 8.375%, 10/15/20 556,800 1,990,000 BBB-/Baa3 Embarq Corp., 7.082%, 6/1/16 2,200,757 -------------- $ 6,601,150 -------------- Total Telecommunication Services $ 6,601,150 - ---------------------------------------------------------------------------------------------------- UTILITIES -- 3.4% Electric Utilities -- 2.1% 1,275,000 BBB+/A3 CenterPoint Energy Houston Electric LLC, 7.0%, 3/1/14 $ 1,458,183 980,000 A-/Baa1 Commonwealth Edison, 6.15%, 9/15/17 1,117,856 751,683 BBB-/Baa3 Crocket Cogeneration, 5.869%, 3/30/25 (144A) 751,119 3,365,000 A-/A2 Enel Finance International SA, 5.125%, 10/7/19 (144A) 3,334,799 1,330,308 BBB-/Baa3 FPL Energy America Wind LLC, 6.639%, 6/20/23 (144A) 1,335,017 457,800 B+/Ba2 FPL Energy Wind Funding, 6.876%, 6/27/17 (144A) 444,638 1,925,000 BBB-/Baa2 Israel Electric Corp., Ltd., 7.25%, 1/15/19 (144A) 2,118,545 610,000 BBB-/Baa2 Israel Electric Corp., Ltd., 9.375%, 1/28/20 (144A) 766,790 910,000 BBB/Baa3 Nevada Power Co., 6.5%, 8/1/18 1,050,711 5,055,000 BBB+/Baa2 NY State Gas and Electric, 6.15%, 12/15/17 (144A) 5,437,446 The accompanying notes are an integral part of these financial statements. 38 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ---------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ---------------------------------------------------------------------------------------------------- Electric Utilities -- (continued) 1,001,930 NR/WD Orcal Geothermal, 6.21%, 12/30/20 (144A) $ 951,743 2,690,000 BB+/Baa3 Public Service of New Mexico, 7.95%, 5/15/18 3,023,165 3,550,000 BBB+/A3 West Penn Power Co., 5.95%, 12/15/17 3,913,790 -------------- $ 25,703,802 - ---------------------------------------------------------------------------------------------------- Gas Utilities -- 0.2% 2,450,000 A+/Aa3 Nakilat, Inc., 6.267%, 12/31/33 (144A) $ 2,326,104 - ---------------------------------------------------------------------------------------------------- Independent Power Producer & Energy Traders -- 1.0% 5,529,176 NR/B1 Coso Geothermal Power Holdings, 7.0%, 7/15/26 (144A) $ 4,783,843 2,675,000 BB-/Ba3 Intergen NV, 9.0%, 6/30/17 (b) 2,835,500 2,105,000 BBB-/Baa3 Kiowa Power Partners LLC, 5.737%, 3/20/21 (144A) 2,135,270 2,570,008 BBB-/Baa3 Panoche Energy Center LLC, 6.88%, 7/31/29 (144A) 2,651,786 -------------- $ 12,406,399 - ---------------------------------------------------------------------------------------------------- Multi-Utilities -- 0.1% 1,365,000 BB/Ba2 NSG Holdings, Inc., 7.75%, 12/15/25 $ 1,269,450 402,410 NR/NR Ormat Funding Corp., 8.25%, 12/30/20 388,829 -------------- $ 1,658,279 -------------- Total Utilities $ 42,094,584 - ---------------------------------------------------------------------------------------------------- TOTAL CORPORATE BONDS (Cost $453,116,990) $ 496,766,086 - ---------------------------------------------------------------------------------------------------- U.S. GOVERNMENT AGENCY OBLIGATIONS -- 20.8% 2,183,547 AAA/Aaa Federal Home Loan Mortgage Corp., 4.5%, 10/1/20 $ 2,302,278 1,180,559 AAA/Aaa Federal Home Loan Mortgage Corp., 4.5%, 3/1/20 1,244,752 3,805,858 AAA/Aaa Federal Home Loan Mortgage Corp., 5.0%, 10/1/20 4,072,862 104,656 AAA/Aaa Federal Home Loan Mortgage Corp., 5.0%, 11/1/34 110,351 155,981 AAA/Aaa Federal Home Loan Mortgage Corp., 5.0%, 12/1/21 165,559 2,530,485 AAA/Aaa Federal Home Loan Mortgage Corp., 5.0%, 2/1/22 2,686,126 2,023,662 AAA/Aaa Federal Home Loan Mortgage Corp., 5.0%, 6/1/35 2,132,516 679,670 AAA/Aaa Federal Home Loan Mortgage Corp., 5.5%, 11/1/34 729,186 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 39 Schedule of Investments | 12/31/10 (unaudited) (continued) - ---------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ---------------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 171,799 AAA/Aaa Federal Home Loan Mortgage Corp., 5.5%, 11/1/34 $ 184,315 427,024 AAA/Aaa Federal Home Loan Mortgage Corp., 5.5%, 11/1/35 457,734 824,916 AAA/Aaa Federal Home Loan Mortgage Corp., 5.5%, 12/1/18 891,692 2,296,573 AAA/Aaa Federal Home Loan Mortgage Corp., 5.5%, 8/1/35 2,461,732 1,300,168 AAA/Aaa Federal Home Loan Mortgage Corp., 5.5%, 9/1/33 1,396,921 185,795 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 1/1/33 204,187 124,174 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 1/1/34 136,466 360,507 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 1/1/34 394,504 143,032 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 11/1/33 157,191 795,572 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 12/1/33 874,327 573,980 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 12/1/33 632,675 135,172 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 12/1/33 148,553 333,090 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 12/1/36 362,004 45,223 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 2/1/33 49,700 309,526 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 2/1/33 340,166 240,088 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 3/1/33 263,855 770,604 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 3/1/33 846,888 71,458 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 4/1/33 78,532 573,919 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 4/1/35 625,531 2,656,090 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 4/1/36 2,886,650 349,863 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 5/1/17 381,842 1,930,029 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 5/1/34 2,112,040 334,840 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 5/1/34 366,417 The accompanying notes are an integral part of these financial statements. 40 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ---------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ---------------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 183,566 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 5/1/34 $ 200,877 1,374,989 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 6/1/35 1,498,641 615,191 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 6/1/35 670,514 330,110 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 7/1/34 362,788 669,853 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 8/1/34 733,023 598,782 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 9/1/33 658,057 474 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 1/1/31 534 387 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 1/1/31 435 1,638 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 1/1/33 1,842 247,674 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 10/1/33 279,674 57,239 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 10/1/33 64,709 881 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 11/1/30 991 322,194 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 11/1/33 364,291 4,086 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 2/1/33 4,595 9,943 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 3/1/13 10,142 1,626 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 3/1/31 1,828 25,767 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 3/1/31 28,973 23,053 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 4/1/34 26,000 1,003 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 5/1/31 1,127 19,642 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 5/1/31 22,085 371 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 6/1/32 417 4,692 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 7/1/31 5,276 54,868 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 7/1/31 61,694 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 41 Schedule of Investments | 12/31/10 (unaudited) (continued) - ---------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ---------------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 49,037 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 7/1/32 $ 55,138 11,256 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 8/1/31 12,657 1,939 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 9/1/31 2,180 10,320 AAA/Aaa Federal Home Loan Mortgage Corp., 7.0%, 11/1/30 11,753 226,644 AAA/Aaa Federal Home Loan Mortgage Corp., 7.0%, 8/1/22 246,630 618,562 AAA/Aaa Federal Home Loan Mortgage Corp., 7.0%, 9/1/22 673,109 3,743 AAA/Aaa Federal Home Loan Mortgage Corp., 8.0%, 8/1/31 4,208 2,700,000 NR/NR Federal National Mortgage Association REMICS, 5.0%, 3/25/24 2,897,868 5,000,000 NR/NR Federal National Mortgage Association REMICS, 5.0%, 7/25/33 5,343,092 244,429 AAA/Aaa Federal National Mortgage Association REMICS, 5.69%, 1/25/32 258,164 907 NR/NR Federal National Mortgage Association, 10.3%, 4/25/19 921 7,751 NR/NR Federal National Mortgage Association, 10.3%, 4/25/19 8,999 179,907 AAA/Aaa Federal National Mortgage Association, 4.0%, 7/1/18 187,806 2,240,776 AAA/Aaa Federal National Mortgage Association, 4.5%, 11/1/20 2,364,018 2,134,600 AAA/Aaa Federal National Mortgage Association, 4.50%, 10/1/35 2,203,103 1,868,571 AAA/Aaa Federal National Mortgage Association, 4.50%, 10/1/35 1,928,537 1,352,544 AAA/Aaa Federal National Mortgage Association, 5.0%, 1/1/20 1,454,196 1,710,778 AAA/Aaa Federal National Mortgage Association, 5.0%, 10/1/20 1,839,353 93,518 AAA/Aaa Federal National Mortgage Association, 5.0%, 12/1/17 100,021 270,956 AAA/Aaa Federal National Mortgage Association, 5.0%, 2/1/20 290,642 150,043 AAA/Aaa Federal National Mortgage Association, 5.0%, 2/1/22 159,271 2,614,224 AAA/Aaa Federal National Mortgage Association, 5.0%, 5/1/23 2,804,164 2,849,367 AAA/Aaa Federal National Mortgage Association, 5.0%, 6/1/40 2,997,609 The accompanying notes are an integral part of these financial statements. 42 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ---------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ---------------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 4,620,442 AAA/Aaa Federal National Mortgage Association, 5.0%, 7/1/40 $ 4,860,827 4,922,551 AAA/Aaa Federal National Mortgage Association, 5.0%, 7/1/40 5,178,653 2,917,856 AAA/Aaa Federal National Mortgage Association, 5.0%, 8/1/40 3,069,661 1,164,898 AAA/Aaa Federal National Mortgage Association, 5.5%, 12/1/17 1,256,412 80,403 AAA/Aaa Federal National Mortgage Association, 5.5%, 2/1/18 87,484 902,833 AAA/Aaa Federal National Mortgage Association, 5.5%, 3/1/25 975,765 2,148,131 AAA/Aaa Federal National Mortgage Association, 5.5%, 3/1/36 2,303,383 1,897,401 AAA/Aaa Federal National Mortgage Association, 5.5%, 5/1/36 2,034,533 203,772 AAA/Aaa Federal National Mortgage Association, 5.5%, 6/1/33 219,645 2,283,155 AAA/Aaa Federal National Mortgage Association, 5.5%, 6/1/36 2,448,166 34,301 AAA/Aaa Federal National Mortgage Association, 5.5%, 7/1/23 37,140 870,512 AAA/Aaa Federal National Mortgage Association, 5.5%, 7/1/33 938,324 4,142,239 AAA/Aaa Federal National Mortgage Association, 5.5%, 7/1/34 4,458,440 68,505 AAA/Aaa Federal National Mortgage Association, 5.5%, 9/1/17 73,867 1,200,708 AAA/Aaa Federal National Mortgage Association, 5.5%, 9/1/19 1,296,202 3,089 AAA/Aaa Federal National Mortgage Association, 6.0%, 1/1/29 3,403 2,408 AAA/Aaa Federal National Mortgage Association, 6.0%, 1/1/29 2,625 14,112 AAA/Aaa Federal National Mortgage Association, 6.0%, 1/1/32 15,546 299,906 AAA/Aaa Federal National Mortgage Association, 6.0%, 10/1/32 330,377 96,180 AAA/Aaa Federal National Mortgage Association, 6.0%, 10/1/34 105,501 1,335,638 AAA/Aaa Federal National Mortgage Association, 6.0%, 10/1/35 1,457,568 100,209 AAA/Aaa Federal National Mortgage Association, 6.0%, 11/1/33 110,390 60,610 AAA/Aaa Federal National Mortgage Association, 6.0%, 11/1/34 66,484 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 43 Schedule of Investments | 12/31/10 (unaudited) (continued) - ---------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ---------------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 2,963,402 AAA/Aaa Federal National Mortgage Association, 6.0%, 12/1/35 $ 3,233,932 31,855 AAA/Aaa Federal National Mortgage Association, 6.0%, 2/1/32 35,113 117,171 AAA/Aaa Federal National Mortgage Association, 6.0%, 2/1/32 129,076 202,311 AAA/Aaa Federal National Mortgage Association, 6.0%, 2/1/33 222,867 19,605 AAA/Aaa Federal National Mortgage Association, 6.0%, 2/1/35 21,505 50,068 AAA/Aaa Federal National Mortgage Association, 6.0%, 2/1/35 54,920 432,230 AAA/Aaa Federal National Mortgage Association, 6.0%, 3/1/33 476,146 25,899 AAA/Aaa Federal National Mortgage Association, 6.0%, 3/1/33 28,530 1,154,640 AAA/Aaa Federal National Mortgage Association, 6.0%, 4/1/33 1,271,955 1,088,898 AAA/Aaa Federal National Mortgage Association, 6.0%, 4/1/35 1,199,533 63,397 AAA/Aaa Federal National Mortgage Association, 6.0%, 5/1/33 69,838 493,859 AAA/Aaa Federal National Mortgage Association, 6.0%, 5/1/35 538,943 108,745 AAA/Aaa Federal National Mortgage Association, 6.0%, 6/1/16 118,379 431,058 AAA/Aaa Federal National Mortgage Association, 6.0%, 7/1/33 474,855 1,476,044 AAA/Aaa Federal National Mortgage Association, 6.0%, 7/1/33 1,626,015 484,070 AAA/Aaa Federal National Mortgage Association, 6.0%, 7/1/38 526,596 21,436 AAA/Aaa Federal National Mortgage Association, 6.0%, 8/1/32 23,614 770,390 AAA/Aaa Federal National Mortgage Association, 6.0%, 8/1/34 848,664 5,403 AAA/Aaa Federal National Mortgage Association, 6.0%, 9/1/29 5,952 3,094 AAA/Aaa Federal National Mortgage Association, 6.0%, 9/1/32 3,409 76,140 AAA/Aaa Federal National Mortgage Association, 6.0%, 9/1/34 83,519 343,190 AAA/Aaa Federal National Mortgage Association, 6.0%, 9/1/34 376,451 1,252,309 AAA/Aaa Federal National Mortgage Association, 6.0%, 9/1/34 1,373,677 The accompanying notes are an integral part of these financial statements. 44 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 62,174 AAA/Aaa Federal National Mortgage Association, 6.0%, 9/1/34 $ 68,200 52,004 AAA/Aaa Federal National Mortgage Association, 6.5% 9/1/31 58,474 8,970 AAA/Aaa Federal National Mortgage Association, 6.5%, 1/1/31 10,086 43,047 AAA/Aaa Federal National Mortgage Association, 6.5%, 10/1/31 48,402 4,313 AAA/Aaa Federal National Mortgage Association, 6.5%, 10/1/31 4,850 12,606 AAA/Aaa Federal National Mortgage Association, 6.5%, 10/1/31 14,174 134,898 AAA/Aaa Federal National Mortgage Association, 6.5%, 10/1/32 151,681 257,016 AAA/Aaa Federal National Mortgage Association, 6.5%, 12/1/31 288,993 41,017 AAA/Aaa Federal National Mortgage Association, 6.5%, 2/1/32 46,120 82,035 AAA/Aaa Federal National Mortgage Association, 6.5%, 2/1/32 92,241 110,828 AAA/Aaa Federal National Mortgage Association, 6.5%, 2/1/33 124,617 141,753 AAA/Aaa Federal National Mortgage Association, 6.5%, 3/1/32 159,389 7,350 AAA/Aaa Federal National Mortgage Association, 6.5%, 4/1/31 8,265 45,501 AAA/Aaa Federal National Mortgage Association, 6.5%, 5/1/31 51,162 195,888 AAA/Aaa Federal National Mortgage Association, 6.5%, 6/1/31 220,260 35,918 AAA/Aaa Federal National Mortgage Association, 6.5%, 7/1/29 40,387 112,167 AAA/Aaa Federal National Mortgage Association, 6.5%, 7/1/34 127,350 16,818 AAA/Aaa Federal National Mortgage Association, 6.5%, 8/1/31 18,911 30,950 AAA/Aaa Federal National Mortgage Association, 6.5%, 9/1/31 34,801 67,948 AAA/Aaa Federal National Mortgage Association, 7.0%, 1/1/32 77,380 5,040 AAA/Aaa Federal National Mortgage Association, 7.0%, 12/1/30 5,738 11,743 AAA/Aaa Federal National Mortgage Association, 7.0%, 12/1/30 13,370 59,790 AAA/Aaa Federal National Mortgage Association, 7.0%, 12/1/31 68,115 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 45 Schedule of Investments | 12/31/10 (unaudited) (continued) - ------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 92,734 AAA/Aaa Federal National Mortgage Association, 7.0%, 12/1/31 $ 105,646 907 AAA/Aaa Federal National Mortgage Association, 7.0%, 3/1/12 926 28,021 AAA/Aaa Federal National Mortgage Association, 7.0%, 4/1/31 31,905 15,116 AAA/Aaa Federal National Mortgage Association, 7.0%, 7/1/21 17,282 11,414 AAA/Aaa Federal National Mortgage Association, 7.0%, 9/1/31 13,004 48,114 AAA/Aaa Federal National Mortgage Association, 7.0%, 9/1/31 54,814 2,082 AAA/Aaa Federal National Mortgage Association, 7.5%, 4/1/30 2,390 2,022 AAA/Aaa Federal National Mortgage Association, 7.5%, 8/1/20 2,325 1,276 AAA/Aaa Federal National Mortgage Association, 8.0%, 10/1/30 1,427 5,823 AAA/Aaa Federal National Mortgage Association, 8.0%, 2/1/29 6,722 1,337 AAA/Aaa Federal National Mortgage Association, 8.0%, 2/1/30 1,545 915 AAA/Aaa Federal National Mortgage Association, 8.0%, 2/1/30 1,057 17,452 AAA/Aaa Federal National Mortgage Association, 8.0%, 3/1/31 20,170 3,617 AAA/Aaa Federal National Mortgage Association, 8.0%, 4/1/20 4,259 1,388 AAA/Aaa Federal National Mortgage Association, 8.0%, 4/1/30 1,606 452 AAA/Aaa Federal National Mortgage Association, 8.0%, 5/1/31 523 1,095 AAA/Aaa Federal National Mortgage Association, 8.0%, 7/1/30 1,266 247,588 AAA/Aaa Government National Mortgage Association I, 6.0%, 2/15/29 273,364 25,331 AAA/Aaa Government National Mortgage Association I, 7.0%, 12/15/30 29,046 45,822 AAA/Aaa Government National Mortgage Association I, 7.0%, 3/15/31 52,567 12,404 AAA/Aaa Government National Mortgage Association I, 7.5%, 10/15/29 14,340 1,190,820 AAA/Aaa Government National Mortgage Association II, 4.5%, 1/20/35 1,249,865 534,051 AAA/Aaa Government National Mortgage Association II, 4.5%, 12/20/34 561,019 The accompanying notes are an integral part of these financial statements. 46 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 1,595,314 AAA/Aaa Government National Mortgage Association II, 5.5%, 10/20/19 $ 1,723,657 85,034 AAA/Aaa Government National Mortgage Association II, 5.5%, 11/20/34 91,966 816,724 AAA/Aaa Government National Mortgage Association II, 5.5%, 3/20/34 883,301 5,870 AAA/Aaa Government National Mortgage Association II, 6.5%, 2/20/29 6,641 2,468 AAA/Aaa Government National Mortgage Association II, 6.5%, 3/20/29 2,792 77,117 AAA/Aaa Government National Mortgage Association II, 6.5%, 4/20/29 87,248 193,780 AAA/Aaa Government National Mortgage Association II, 7.0%, 1/20/29 221,147 183,702 AAA/Aaa Government National Mortgage Association II, 7.0%, 11/20/28 209,551 5,702 AAA/Aaa Government National Mortgage Association II, 7.0%, 12/20/30 6,510 1,010,718 AAA/Aaa Government National Mortgage Association, 4.5%, 10/15/33 1,057,035 782,156 AAA/Aaa Government National Mortgage Association, 4.5%, 10/15/33 818,000 1,093,614 AAA/Aaa Government National Mortgage Association, 4.5%, 10/15/35 1,140,997 91,420 AAA/Aaa Government National Mortgage Association, 4.5%, 2/15/34 95,614 799,361 AAA/Aaa Government National Mortgage Association, 4.5%, 3/15/35 833,995 302,497 AAA/Aaa Government National Mortgage Association, 4.5%, 3/15/35 315,603 220,982 AAA/Aaa Government National Mortgage Association, 4.5%, 3/20/35 231,939 1,024,636 AAA/Aaa Government National Mortgage Association, 4.5%, 4/15/35 1,069,030 132,673 AAA/Aaa Government National Mortgage Association, 4.5%, 4/15/35 138,422 716,872 AAA/Aaa Government National Mortgage Association, 4.5%, 4/15/38 745,692 90,162 AAA/Aaa Government National Mortgage Association, 4.5%, 5/15/34 94,181 256,014 AAA/Aaa Government National Mortgage Association, 4.5%, 7/15/33 267,746 934,339 AAA/Aaa Government National Mortgage Association, 4.5%, 9/15/33 977,156 217,124 AAA/Aaa Government National Mortgage Association, 4.5%, 9/15/35 226,531 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 47 Schedule of Investments | 12/31/10 (unaudited) (continued) - --------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - --------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 627,976 AAA/Aaa Government National Mortgage Association, 5.0%, 10/15/18 $ 673,210 499,892 AAA/Aaa Government National Mortgage Association, 5.0%, 4/15/34 533,061 1,171,362 AAA/Aaa Government National Mortgage Association, 5.0%, 4/15/35 1,258,600 533,900 AAA/Aaa Government National Mortgage Association, 5.0%, 7/15/19 572,108 5,713 AAA/Aaa Government National Mortgage Association, 5.0%, 7/15/19 6,122 345,946 AAA/Aaa Government National Mortgage Association, 5.0%, 9/15/33 370,422 607,899 AAA/Aaa Government National Mortgage Association, 5.5%, 1/15/35 659,472 771,005 AAA/Aaa Government National Mortgage Association, 5.5%, 10/15/17 834,612 204,177 AAA/Aaa Government National Mortgage Association, 5.5%, 10/15/17 221,022 89,345 AAA/Aaa Government National Mortgage Association, 5.5%, 10/15/33 97,065 421,879 AAA/Aaa Government National Mortgage Association, 5.5%, 10/15/35 457,671 808,363 AAA/Aaa Government National Mortgage Association, 5.5%, 10/15/35 876,943 228,288 AAA/Aaa Government National Mortgage Association, 5.5%, 11/15/18 247,407 953,386 AAA/Aaa Government National Mortgage Association, 5.5%, 11/15/19 1,033,083 1,604,730 AAA/Aaa Government National Mortgage Association, 5.5%, 11/15/34 1,742,880 97,200 AAA/Aaa Government National Mortgage Association, 5.5%, 12/15/18 105,341 447,713 AAA/Aaa Government National Mortgage Association, 5.5%, 2/15/18 485,209 576,242 AAA/Aaa Government National Mortgage Association, 5.5%, 2/15/18 624,502 175,658 AAA/Aaa Government National Mortgage Association, 5.5%, 2/15/35 190,560 502,869 AAA/Aaa Government National Mortgage Association, 5.5%, 2/15/35 545,532 244,844 AAA/Aaa Government National Mortgage Association, 5.5%, 2/15/37 265,310 3,998 AAA/Aaa Government National Mortgage Association, 5.5%, 4/15/19 4,366 755,155 AAA/Aaa Government National Mortgage Association, 5.5%, 4/20/34 816,714 The accompanying notes are an integral part of these financial statements. 48 Pioneer Bond Fund | Semiannual Report | 12/31/10 - --------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - --------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 70,540 AAA/Aaa Government National Mortgage Association, 5.5%, 6/15/33 $ 76,741 642,835 AAA/Aaa Government National Mortgage Association, 5.5%, 6/15/35 699,381 288,494 AAA/Aaa Government National Mortgage Association, 5.5%, 7/15/33 313,421 320,740 AAA/Aaa Government National Mortgage Association, 5.5%, 7/15/33 348,452 1,810,747 AAA/Aaa Government National Mortgage Association, 5.5%, 7/15/34 1,969,624 1,806,907 AAA/Aaa Government National Mortgage Association, 5.5%, 7/15/35 1,960,203 770,007 AAA/Aaa Government National Mortgage Association, 5.5%, 8/15/19 835,819 907,057 AAA/Aaa Government National Mortgage Association, 5.5%, 8/15/19 985,999 55,848 AAA/Aaa Government National Mortgage Association, 5.5%, 8/15/33 60,674 69,209 AAA/Aaa Government National Mortgage Association, 5.5%, 8/15/33 75,188 133,858 AAA/Aaa Government National Mortgage Association, 5.5%, 8/15/33 145,423 600,857 AAA/Aaa Government National Mortgage Association, 5.5%, 9/15/19 651,084 718,677 AAA/Aaa Government National Mortgage Association, 5.5%, 9/15/33 780,772 41,788 AAA/Aaa Government National Mortgage Association, 6.0%, 1/15/17 45,555 89,862 AAA/Aaa Government National Mortgage Association, 6.0%, 1/15/19 98,385 148,862 AAA/Aaa Government National Mortgage Association, 6.0%, 1/15/33 165,523 399,197 AAA/Aaa Government National Mortgage Association, 6.0%, 1/15/33 440,757 104,838 AAA/Aaa Government National Mortgage Association, 6.0%, 10/15/32 115,753 151,358 AAA/Aaa Government National Mortgage Association, 6.0%, 10/15/33 168,298 806,355 AAA/Aaa Government National Mortgage Association, 6.0%, 10/15/34 896,350 973,310 AAA/Aaa Government National Mortgage Association, 6.0%, 10/15/36 1,073,118 146,087 AAA/Aaa Government National Mortgage Association, 6.0%, 11/15/31 161,296 393,337 AAA/Aaa Government National Mortgage Association, 6.0%, 11/15/34 437,237 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 49 Schedule of Investments | 12/31/10 (unaudited) (continued) - --------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - --------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 222,265 AAA/Aaa Government National Mortgage Association, 6.0%, 12/15/32 $ 249,497 113,732 AAA/Aaa Government National Mortgage Association, 6.0%, 2/15/33 126,461 166,300 AAA/Aaa Government National Mortgage Association, 6.0%, 3/15/17 181,293 152,069 AAA/Aaa Government National Mortgage Association, 6.0%, 3/15/17 165,779 6,379 AAA/Aaa Government National Mortgage Association, 6.0%, 3/15/32 7,043 352,997 AAA/Aaa Government National Mortgage Association, 6.0%, 3/15/33 392,504 329,833 AAA/Aaa Government National Mortgage Association, 6.0%, 3/15/33 366,749 475,890 AAA/Aaa Government National Mortgage Association, 6.0%, 3/15/33 529,152 991,376 AAA/Aaa Government National Mortgage Association, 6.0%, 3/15/33 1,102,331 435,470 AAA/Aaa Government National Mortgage Association, 6.0%, 3/15/33 480,805 887,740 AAA/Aaa Government National Mortgage Association, 6.0%, 3/15/33 980,161 9,066 AAA/Aaa Government National Mortgage Association, 6.0%, 4/15/13 9,866 827 AAA/Aaa Government National Mortgage Association, 6.0%, 4/15/14 900 165,254 AAA/Aaa Government National Mortgage Association, 6.0%, 4/15/18 180,282 327,935 AAA/Aaa Government National Mortgage Association, 6.0%, 4/15/33 364,637 72,463 AAA/Aaa Government National Mortgage Association, 6.0%, 4/15/33 80,573 193,924 AAA/Aaa Government National Mortgage Association, 6.0%, 4/15/33 215,628 256,199 AAA/Aaa Government National Mortgage Association, 6.0%, 5/15/17 279,297 207,074 AAA/Aaa Government National Mortgage Association, 6.0%, 5/15/17 225,742 441,407 AAA/Aaa Government National Mortgage Association, 6.0%, 5/15/33 490,809 47,971 AAA/Aaa Government National Mortgage Association, 6.0%, 6/15/17 52,296 25,904 AAA/Aaa Government National Mortgage Association, 6.0%, 6/15/33 28,804 502,052 AAA/Aaa Government National Mortgage Association, 6.0%, 7/15/33 535,834 The accompanying notes are an integral part of these financial statements. 50 Pioneer Bond Fund | Semiannual Report | 12/31/10 - -------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - -------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 2,127 AAA/Aaa Government National Mortgage Association, 6.0%, 8/15/13 $ 2,248 87,197 AAA/Aaa Government National Mortgage Association, 6.0%, 8/15/32 96,275 27,145 AAA/Aaa Government National Mortgage Association, 6.0%, 8/15/32 29,971 1,396,529 AAA/Aaa Government National Mortgage Association, 6.0%, 8/15/36 1,542,646 428,556 AAA/Aaa Government National Mortgage Association, 6.0%, 9/15/19 467,595 900,039 AAA/Aaa Government National Mortgage Association, 6.0%, 9/15/28 993,740 168,701 AAA/Aaa Government National Mortgage Association, 6.0%, 9/15/32 186,265 12,067 AAA/Aaa Government National Mortgage Association, 6.0%, 9/15/32 13,323 35,734 AAA/Aaa Government National Mortgage Association, 6.0%, 9/15/33 39,734 181,341 AAA/Aaa Government National Mortgage Association, 6.0%, 9/15/33 201,637 158,053 AAA/Aaa Government National Mortgage Association, 6.0%, 9/15/34 175,693 476,821 AAA/Aaa Government National Mortgage Association, 6.0%, 9/15/34 530,038 2,117,594 AAA/Aaa Government National Mortgage Association, 6.0%, 9/15/35 2,354,285 46,851 AAA/Aaa Government National Mortgage Association, 6.5%, 1/15/29 53,191 254,332 AAA/Aaa Government National Mortgage Association, 6.5%, 1/15/32 288,752 1,195,511 AAA/Aaa Government National Mortgage Association, 6.5%, 1/15/33 1,357,302 12,620 AAA/Aaa Government National Mortgage Association, 6.5%, 1/15/33 14,328 92,983 AAA/Aaa Government National Mortgage Association, 6.5%, 1/15/34 105,392 10,950 AAA/Aaa Government National Mortgage Association, 6.5%, 1/15/35 12,412 113,611 AAA/Aaa Government National Mortgage Association, 6.5%, 10/15/31 128,986 370,297 AAA/Aaa Government National Mortgage Association, 6.5%, 10/15/31 420,410 21,530 AAA/Aaa Government National Mortgage Association, 6.5%, 10/15/31 24,444 259,725 AAA/Aaa Government National Mortgage Association, 6.5%, 10/15/32 294,874 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 51 Schedule of Investments | 12/31/10 (unaudited) (continued) - -------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - -------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 5,163 AAA/Aaa Government National Mortgage Association, 6.5%, 10/15/33 $ 5,852 13,724 AAA/Aaa Government National Mortgage Association, 6.5%, 11/15/31 15,581 181,301 AAA/Aaa Government National Mortgage Association, 6.5%, 11/15/32 205,836 1,145,011 AAA/Aaa Government National Mortgage Association, 6.5%, 12/15/32 1,299,968 4,276 AAA/Aaa Government National Mortgage Association, 6.5%, 2/15/29 4,855 17,770 AAA/Aaa Government National Mortgage Association, 6.5%, 2/15/29 20,174 98,762 AAA/Aaa Government National Mortgage Association, 6.5%, 2/15/32 112,127 251,265 AAA/Aaa Government National Mortgage Association, 6.5%, 2/15/34 286,525 27,281 AAA/Aaa Government National Mortgage Association, 6.5%, 3/15/29 30,974 138,647 AAA/Aaa Government National Mortgage Association, 6.5%, 3/15/29 157,410 35,663 AAA/Aaa Government National Mortgage Association, 6.5%, 3/15/29 40,490 28,544 AAA/Aaa Government National Mortgage Association, 6.5%, 3/15/31 32,407 66,726 AAA/Aaa Government National Mortgage Association, 6.5%, 3/15/32 75,756 226,516 AAA/Aaa Government National Mortgage Association, 6.5%, 4/15/31 257,171 23,950 AAA/Aaa Government National Mortgage Association, 6.5%, 4/15/32 27,191 129,246 AAA/Aaa Government National Mortgage Association, 6.5%, 4/15/35 146,899 450 AAA/Aaa Government National Mortgage Association, 6.5%, 5/15/26 510 213,462 AAA/Aaa Government National Mortgage Association, 6.5%, 5/15/29 242,435 10,241 AAA/Aaa Government National Mortgage Association, 6.5%, 5/15/29 11,627 65,878 AAA/Aaa Government National Mortgage Association, 6.5%, 5/15/31 74,793 56,584 AAA/Aaa Government National Mortgage Association, 6.5%, 5/15/31 64,241 27,808 AAA/Aaa Government National Mortgage Association, 6.5%, 5/15/32 31,571 102,080 AAA/Aaa Government National Mortgage Association, 6.5%, 5/15/33 115,703 The accompanying notes are an integral part of these financial statements. 52 Pioneer Bond Fund | Semiannual Report | 12/31/10 - -------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - -------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 48,571 AAA/Aaa Government National Mortgage Association, 6.5%, 6/15/32 $ 55,144 312,754 AAA/Aaa Government National Mortgage Association, 6.5%, 6/15/34 356,644 19,043 AAA/Aaa Government National Mortgage Association, 6.5%, 6/15/35 21,715 568,490 AAA/Aaa Government National Mortgage Association, 6.5%, 7/15/32 645,426 113,243 AAA/Aaa Government National Mortgage Association, 6.5%, 7/15/32 128,568 200,879 AAA/Aaa Government National Mortgage Association, 6.5%, 7/15/35 227,688 170,745 AAA/Aaa Government National Mortgage Association, 6.5%, 7/15/35 193,639 1,056 AAA/Aaa Government National Mortgage Association, 6.5%, 8/15/11 1,065 141,082 AAA/Aaa Government National Mortgage Association, 6.5%, 8/15/31 160,175 84,145 AAA/Aaa Government National Mortgage Association, 6.5%, 8/15/32 95,532 25,241 AAA/Aaa Government National Mortgage Association, 6.5%, 8/15/32 28,656 17,967 AAA/Aaa Government National Mortgage Association, 6.5%, 9/15/34 20,365 39,940 AAA/Aaa Government National Mortgage Association, 7.0%, 10/15/31 45,819 119,915 AAA/Aaa Government National Mortgage Association, 7.0%, 11/15/28 137,365 48,958 AAA/Aaa Government National Mortgage Association, 7.0%, 11/15/28 56,082 9,109 AAA/Aaa Government National Mortgage Association, 7.0%, 12/15/13 9,715 9,372 AAA/Aaa Government National Mortgage Association, 7.0%, 12/15/30 10,746 4,856 AAA/Aaa Government National Mortgage Association, 7.0%, 4/15/28 5,564 48,125 AAA/Aaa Government National Mortgage Association, 7.0%, 4/15/29 55,162 17,272 AAA/Aaa Government National Mortgage Association, 7.0%, 4/15/31 19,814 172,251 AAA/Aaa Government National Mortgage Association, 7.0%, 5/15/32 197,252 32,402 AAA/Aaa Government National Mortgage Association, 7.0%, 6/15/31 37,172 81,622 AAA/Aaa Government National Mortgage Association, 7.0%, 6/15/31 93,592 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 53 Schedule of Investments | 12/31/10 (unaudited) (continued) - ------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 9,991 AAA/Aaa Government National Mortgage Association, 7.0%, 7/15/31 $ 11,457 3,650 AAA/Aaa Government National Mortgage Association, 7.0%, 8/15/28 4,182 386,678 AAA/Aaa Government National Mortgage Association, 7.0%, 8/15/31 443,597 5,542 AAA/Aaa Government National Mortgage Association, 7.0%, 9/15/11 5,646 44,472 AAA/Aaa Government National Mortgage Association, 7.0%, 9/15/31 51,018 100,643 AAA/Aaa Government National Mortgage Association, 7.5%, 12/15/31 116,654 6,062 AAA/Aaa Government National Mortgage Association, 7.5%, 2/15/26 6,990 17,255 AAA/Aaa Government National Mortgage Association, 7.5%, 2/15/31 20,000 284 AAA/Aaa Government National Mortgage Association, 7.5%, 8/15/11 285 21,446 AAA/Aaa Government National Mortgage Association, 7.5%, 8/15/29 24,792 9,670 AAA/Aaa Government National Mortgage Association, 7.75%, 2/15/30 11,358 83,150,625 0.70 NR/NR Government National Mortgage Association, Floating Rate Note, 11/16/51 4,065,118 11,750,000 AAA/Aaa U.S. Treasury Bonds, 2.75%, 2/15/19 11,598,531 5,100,000 AAA/Aaa U.S. Treasury Bonds, 5.25%, 11/15/28 5,845,079 4,750,000 AAA/Aaa U.S. Treasury Bonds, 6.25%, 8/15/23 5,970,156 6,380,000 AAA/Aaa U.S. Treasury Notes, 3.125%, 5/15/19 6,447,290 2,500,000 AAA/Aaa U.S. Treasury Notes, 3.625%, 8/15/19 2,611,720 7,620,000 AAA/Aaa U.S. Treasury Notes, 4.25%, 5/15/39 7,506,889 1,365,000 NR/Aaa U.S. Treasury Notes, 4.375%, 11/15/39 1,372,251 5,450,000 AAA/Aaa U.S. Treasury Notes, 4.375%, 2/15/38 5,507,906 2,000,000 AAA/Aaa U.S. Treasury Notes, 4.375%, 5/15/40 2,009,680 7,340,000 AAA/Aaa U.S. Treasury Notes, 4.5%, 2/15/36 7,599,190 8,435,000 AAA/Aaa U.S. Treasury Notes, 4.5%, 5/15/38 8,690,682 9,068,000 AAA/Aaa U.S. Treasury Notes, 4.5%, 8/15/39 9,311,703 4,000,000 NR/Aaa U.S. Treasury Notes, 4.625%, 2/15/40 4,190,000 840,000 AAA/Aaa U.S. Treasury Notes, 5.5%, 8/15/28 989,756 450,000 AAA/Aaa U.S. Treasury Notes, 7.875%, 2/15/21 627,750 -------------- $ 252,447,102 - ------------------------------------------------------------------------------------------------- TOTAL U.S. GOVERNMENT AGENCY OBLIGATIONS (Cost $239,614,323) $ 252,447,102 - ------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 54 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ----------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ----------------------------------------------------------------------------------------------------------- FOREIGN GOVERNMENT BONDS -- 0.1% BANKS -- 0.1% Diversified Banks -- 0.1% 625,000 A/A1 Export-Import Bank of Korea, 5.875%, 1/14/15 $ 676,831 -------------- Total Banks $ 676,831 - ----------------------------------------------------------------------------------------------------------- TOTAL FOREIGN GOVERNMENT BONDS (Cost $622,250) $ 676,831 - ----------------------------------------------------------------------------------------------------------- MUNICIPAL BONDS -- 1.0% Municipal General -- 0.3% 1,660,000 AA+/Aa1 State of Washington, 5.0%, 7/1/18 $ 1,914,129 855,000 A+/A1 State of Illinois, 3.321%, 1/1/13 857,155 -------------- $ 2,771,284 - ----------------------------------------------------------------------------------------------------------- Municipal Higher Education -- 0.7% 4,380,000 AA+/Aa2 California State University Revenue, 5.0%, 11/1/39 $ 4,217,940 4,600,000 AAA/Aaa Connecticut State Health & Education, 5.0%, 7/1/42 4,666,194 -------------- $ 8,884,134 - ----------------------------------------------------------------------------------------------------------- TOTAL MUNICIPAL BONDS (Cost $11,633,662) $ 11,655,418 - ----------------------------------------------------------------------------------------------------------- SENIOR FLOATING RATE LOAN INTERESTS -- 9.3%** ENERGY -- 0.2% Oil & Gas Equipment & Services -- 0.1% 1,527,546 8.50 B+/NR Hudson Products Holdings, Inc., Term Loan, 8/24/15 $ 1,479,810 - ----------------------------------------------------------------------------------------------------------- Oil & Gas Refining & Marketing -- 0.1% 1,505,978 5.25 NR/Ba2 Pilot Travel Centers, Initial Tranche B Term Loan, 6/30/16 $ 1,530,827 -------------- Total Energy $ 3,010,637 - ----------------------------------------------------------------------------------------------------------- MATERIALS -- 0.9% Diversified Chemical -- 0.2% 201,370 1.79 BB+/Ba2 Celanese Holdings LLC, Term B Dollar Loan, 4/2/14 $ 201,426 201,370 3.29 BB+/Ba2 Celanese Holdings LLC, Term C Dollar Loan, 10/31/16 202,755 358,847 1.78 BB-/Ba2 Huntsman Corp., New Term B Loan, 4/21/14 351,719 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 55 Schedule of Investments | 12/31/10 (unaudited) (continued) - ---------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ---------------------------------------------------------------------------------------------------- Diversified Chemical -- (continued) 949,817 7.50 NR/NR Ineos U.S. Finance Corp., Senior Credit Term Loan, 12/16/13 $ 981,873 950,544 8.00 NR/NR Ineos U.S. Finance Corp., Senior Credit Term Loan, 12/16/14 982,625 -------------- $ 2,720,398 - ---------------------------------------------------------------------------------------------------- Metal & Glass Containers -- 0.2% 500,343 5.52 B/Ba3 BWAY Holding Co., Term B Loan, 3/28/17 $ 504,176 1,831,430 6.75 B+/B2 Graham Packaging Co., Term C Loan, 4/5/14 1,853,015 46,907 5.56 B/Ba3 ICL Industrial Containers, Term C Loan, 6/16/17 47,266 -------------- $ 2,404,457 - ---------------------------------------------------------------------------------------------------- Paper Packaging -- 0.3% 369,075 6.00 B+/B2 Graham Packaging Co., Term D Loan, 9/9/16 $ 373,842 2,474,870 3.04 BB/Ba2 Graphic Packaging International, Inc., Incremental Term Loan, 5/16/14 2,467,290 -------------- $ 2,841,132 - ---------------------------------------------------------------------------------------------------- Precious Metals & Minerals -- 0.1% 1,441,196 6.27 NR/NR Fairmount Minerals, Ltd., Tranche B Term - ---------------------------------------------------------------------------------------------------- Loan, 7/11/16 $ 1,468,519 -------------------------------------------------------- Specialty Chemicals -- 0.1% 385,000 6.00 NR/NR Chemtura Corp., Term Loan, 3/22/11 $ 385,963 1,235,000 5.50 NR/NR Chemtura Corp., Term Facility Loan, 8/11/16 1,248,894 -------------- $ 1,634,857 -------------- Total Materials $ 11,069,363 - ---------------------------------------------------------------------------------------------------- CAPITAL GOODS -- 0.9% Aerospace & Defense -- 0.8% 987,521 4.04 NR/NR DAE Aviation Holdings, Inc., Tranche B1 Term Loan, 7/31/14 $ 977,646 3,531,150 6.25 BB-/Ba3 DynCorp International, Inc., Term Loan, 7/7/16 3,562,048 953,777 4.04 NR/NR Standard Aero, Ltd., Tranche B2 Term Loan, 7/31/14 944,239 1,731,323 5.50 NR/Ba2 Tasc, Inc., Tranche A Term Loan, 12/18/14 1,741,422 241,312 5.75 NR/Ba2 Tasc, Inc., Tranche B Term Loan, 12/18/15 243,726 1,995,000 4.50 NR/NR Triumph Group, Inc., Term Loan, 6/16/16 2,008,466 -------------- $ 9,477,547 - ---------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 56 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------- Construction & Farm Machinery & Heavy Trucks -- 0.1% 895,576 4.25 BB+/Ba2 Bucyrus International, Inc., Tranche C Term Loan, 12/21/15 $ 900,385 - ------------------------------------------------------------------------------------------------------- Industrial Conglomerates -- 0.0% 789,297 6.25 NR/NR Tomkins Plc, Term B Loan, 9/7/16 $ 801,348 -------------- Total Capital Goods $ 11,179,280 - ------------------------------------------------------------------------------------------------------- COMMERCIAL SERVICES & SUPPLIES -- 0.3% Diversified Support Services -- 0.0% 527,657 1.81 BB+/Baa3 Iron Mountain, Inc., Initial Term Loan, 4/16/14 $ 530,295 - ------------------------------------------------------------------------------------------------------- Environmental & Facilities Services -- 0.3% 637,779 6.00 NR/Ba3 Advanced Disposal Services, Inc., Term B Loan, 1/14/15 $ 645,751 2,909,548 2.27 D/B2 Synagro Technologies, Inc., 1st Lien Term Loan, 4/2/14 2,589,497 -------------- $ 3,235,248 -------------- Total Commercial Services & Supplies $ 3,765,543 - ------------------------------------------------------------------------------------------------------- TRANSPORTATION -- 0.2% Air Freight & Couriers -- 0.1% 351,403 3.26 B-/B1 Ceva Group Plc, EGL Tranche B Term Loan, 11/4/13 $ 332,954 462,700 3.29 NR/NR Ceva Group Plc, Tranche B Dollar Term Loan, 11/4/13 438,408 843,532 3.26 NR/NR Ceva Group Plc, U.S. Tranche B Term Loan, 11/4/13 799,247 -------------- $ 1,570,609 - ------------------------------------------------------------------------------------------------------- Marine -- 0.1% 653,125 3.31 NR/NR Horizon Lines, Inc., Term Loan, 8/8/12 $ 631,898 -------------- Total Transportation $ 2,202,507 - ------------------------------------------------------------------------------------------------------- AUTOMOBILES & COMPONENTS -- 0.7% Auto Parts & Equipment -- 0.2% 1,073,788 3.03 BB-/B2 Allison Transmission, Term Loan, 8/7/14 $ 1,051,417 1,074,865 2.21 NR/NR Federal Mogul Corp., Tranche B Term Loan, 12/29/14 1,005,191 548,400 2.20 NR/NR Federal Mogul Corp., Tranche C Term Loan, 12/28/15 512,852 -------------- $ 2,569,460 - ------------------------------------------------------------------------------------------------------- Automobile Manufacturers -- 0.1% 1,350,223 3.03 B/Baa3 Ford Motor Co., Tranche B1 Term Loan, 12/15/13 $ 1,346,656 - ------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 57 Schedule of Investments | 12/31/10 (unaudited) (continued) - ------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------- Tires & Rubber -- 0.4% 4,190,000 1.96 BB/Ba1 Goodyear Tire & Rubber Co., 2nd Lien Term Loan, 4/30/14 $ 4,090,488 -------------- Total Automobiles & Components $ 8,006,604 - ------------------------------------------------------------------------------------------------------- CONSUMER DURABLES & APPAREL -- 0.1% Housewares & Specialties -- 0.1% 648,468 2.80 BB+/Ba1 Jarden Corp., Term B3 Loan, 1/24/12 $ 647,050 -------------- Total Consumer Durables & Apparel $ 647,050 - ------------------------------------------------------------------------------------------------------- CONSUMER SERVICES -- 0.1% Restaurants -- 0.1% 1,065,000 6.25 BB+/Ba2 Burger King Holdings, Inc., Tranche B Term Loan, 9/7/16 $ 1,081,831 - ------------------------------------------------------------------------------------------------------- Specialized Consumer Services -- 0.0% 331,608 7.00 NR/NR Web Service Center, Term Loan, 8/28/14 $ 331,193 -------------- Total Consumer Services $ 1,413,024 - ------------------------------------------------------------------------------------------------------- MEDIA -- 1.2% Advertising -- 0.1% 1,109,240 5.00 BB/Ba2 Affinion Group, Inc., Tranche B Term Loan, 10/9/16 $ 1,105,947 - ------------------------------------------------------------------------------------------------------- Broadcasting -- 0.2% 2,910,267 4.51 B/Baa2 Univision Communications, Inc., Extended Term Loan, 3/29/17 $ 2,772,029 - ------------------------------------------------------------------------------------------------------- Cable & Satellite -- 0.4% 4,098,552 3.56 NR/NR Charter Communications, Inc., Term C Loan, 9/8/16 $ 4,053,724 351,879 2.27 NR/NR Charter Communications, Inc., Term B1 Loan, 3/5/14 348,020 621,651 2.76 CCC/B2 WideOpenWest LLC, 1st Lien Term Loan, 6/30/14 576,841 -------------- $ 4,978,585 - ------------------------------------------------------------------------------------------------------- Movies & Entertainment -- 0.3% 1,318,971 5.25 NR/NR Christie/AIX, Inc., Term Loan, 4/29/16 $ 1,312,376 1,687,250 4.50 B+/NR Live Nation Entertainment, Term B Loan, 10/20/16 1,690,048 -------------- $ 3,002,424 - ------------------------------------------------------------------------------------------------------- Publishing -- 0.2% 2,388,000 6.75 NR/NR Interactive Data Corp., Term Loan, 1/29/17 $ 2,425,303 -------------- Total Media $ 14,284,288 - ------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 58 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------- RETAILING -- 0.1% Automotive Retail -- 0.1% 1,425,000 0.00 NR/NR Autotrader Com, Inc., Tranche B Term Loan, 11/16/16 $ 1,435,243 -------------- Total Retailing $ 1,435,243 - ------------------------------------------------------------------------------------------------------- FOOD & DRUG RETAILING -- 0.0% Food Retail -- 0.0% 354,076 2.76 BB-/Ba3 Pinnacle Foods Group, Inc., Term Loan, 4/2/14 $ 347,962 -------------- Total Food & Drug Retailing $ 347,962 - ------------------------------------------------------------------------------------------------------- FOOD, BEVERAGE & TOBACCO -- 0.2% Packaged Foods & Meats -- 0.2% 2,000,000 6.50 NR/NR Reynolds Group Holdings, Ltd., Incremental Term Loan, 3/16/16 $ 2,022,216 -------------- Total Food, Beverage & Tobacco $ 2,022,216 - ------------------------------------------------------------------------------------------------------- HOUSEHOLD & PERSONAL PRODUCTS -- 0.1% Personal Products -- 0.1% 1,000,000 6.25 BB/Ba1 NBTY, Inc., Term B Loan, 12/29/17 $ 1,015,413 -------------- Total Household & Personal Products $ 1,015,413 - ------------------------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 1.4% Health Care Facilities -- 0.7% 1,647,550 6.50 B+/B1 Ardent Health Services LLC, Term Loan, 9/15/15 $ 1,648,236 111,403 2.55 BB-/Ba3 CHS/Community Health Systems, Inc., Non-Extended Term Loan, 7/25/14 108,806 2,163,120 2.54 BB-/Ba3 CHS/Community Health Systems, Inc., Non-Extended Term Loan, 7/25/14 2,112,692 747,900 2.55 BB+/Ba2 HCA, Inc., Tranche B1 Term Loan, 11/18/13 741,543 1,793,613 3.55 BB+/Ba2 HCA, Inc., Tranche B2 Term Loan, 3/17/17 1,793,239 2,050,000 5.50 NR/NR Universal Health Services, Inc., Tranche B Term Loan, 5/16/16 2,080,186 -------------- $ 8,484,702 - ------------------------------------------------------------------------------------------------------- Health Care Services -- 0.3% 2,772,260 2.51 NR/NR Catalent Pharma Solutions, Inc., Dollar Term Loan, 4/10/14 $ 2,640,578 400,000 4.50 BB/Ba1 DaVita, Inc., Tranche B Term Loan, 10/20/16 404,321 -------------- $ 3,044,899 - ------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 59 Schedule of Investments | 12/31/10 (unaudited) (continued) - ------------------------------------------------------------------------------------------------------ Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------ Health Care Supplies -- 0.4% 2,237,302 3.54 BB-/B1 Bausch & Lomb, Inc., Parent Term Loan, 4/24/15 $ 2,230,306 543,229 3.51 BB-/B1 Bausch & Lomb, Inc., Delayed Draw Term Loan, 4/24/15 542,116 1,499,726 3.29 BB/Ba2 Biomet, Inc., Dollar Term Loan, 3/25/15 1,497,584 -------------- $ 4,270,006 - ------------------------------------------------------------------------------------------------------ Health Care Technology -- 0.0% 470,364 5.25 NR/NR IMS Health, Inc., Tranche B Dollar Term Loan, 2/26/16 $ 476,244 -------------- Total Health Care Equipment & Services $ 16,275,851 - ------------------------------------------------------------------------------------------------------ PHARMACEUTICALS & BIOTECHNOLOGY -- 0.4% Biotechnology -- 0.4% 1,030,000 0.00 NR/NR Grifols, Inc., U.S. Tranche B Term Loan, 6/4/16 $ 1,043,305 905,850 6.25 NR/Ba3 Warner Chilcott Corp., Additional Term Loan, 4/30/15 913,148 665,085 6.00 NR/Ba3 Warner Chilcott Corp., Term A Loan, 10/30/14 667,371 329,132 6.25 NR/Ba3 Warner Chilcott Corp., Term B1 Loan, 4/30/15 331,686 548,064 6.25 NR/Ba3 Warner Chilcott Corp., Term B2 Loan, 4/30/15 552,317 760,956 6.50 NR/Ba3 Warner Chilcott Corp., Term B3 Loan, 2/22/16 769,217 -------------- $ 4,277,044 -------------- Total Pharmaceuticals & Biotechnology $ 4,277,044 - ------------------------------------------------------------------------------------------------------ DIVERSIFIED FINANCIALS -- 0.2% Diversified Financial Services -- 0.1% 1,010,000 6.25 NR/NR WorldPay, Facility B2A Term Loan, 8/6/17 $ 1,018,585 - ------------------------------------------------------------------------------------------------------ Specialized Finance -- 0.1% 980,075 4.75 BBB-/Ba2 MSCI, Inc., Term Loan, 6/1/16 $ 988,345 -------------- Total Diversified Financials $ 2,006,930 - ------------------------------------------------------------------------------------------------------ INSURANCE -- 0.1% Insurance Brokers -- 0.1% 328,783 2.80 B/NR HUB International Holdings, Delayed Draw Term Loan, 6/13/14 $ 319,844 1,462,665 2.80 B/NR HUB International Holdings, Initial Term Loan, 6/13/14 1,422,899 -------------- $ 1,742,743 -------------- Total Insurance $ 1,742,743 - ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 60 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------- SOFTWARE & SERVICES -- 0.7% Application Software -- 0.0% 386,000 2.02 B/Ba3 Nuance Communications, Inc., Incremental Term Loan, 3/29/13 $ 381,899 - ------------------------------------------------------------------------------------------------------- Data Processing & Outsourced Services -- 0.1% 1,007,475 5.25 BBB-/Ba1 Fidelity National Information, Term B Loan, 7/18/16 $ 1,021,429 - ------------------------------------------------------------------------------------------------------- Internet Software & Services -- 0.4% 4,438,875 6.75 NR/NR SAVVIS, Inc., Term Loan, 8/4/16 $ 4,513,089 - ------------------------------------------------------------------------------------------------------- IT Consulting & Other Services -- 0.2% 2,329,542 2.01 BB/Ba3 Sungard Data Systems, Inc., Tranche A U.S. Term Loan, 2/28/14 $ 2,276,036 - ------------------------------------------------------------------------------------------------------- Systems Software -- 0.0% 354,945 5.25 BB-/Ba3 Dealer Computer Services, Term Loan, 4/1/17 $ 357,885 -------------- Total Software & Services $ 8,550,338 - ------------------------------------------------------------------------------------------------------- TECHNOLOGY HARDWARE & EQUIPMENT -- 0.3% Electronic Components -- 0.3% 2,718,456 2.51 NR/Ba1 Flextronics Semiconductor, A Closing Date Term Loan, 10/1/14 $ 2,687,193 502,437 2.51 NR/Ba1 Flextronics Semiconductor, A1A Delayed Draw Term Loan, 10/1/14 496,659 319,780 2.51 NR/Ba1 Flextronics Semiconductor, A2 Delayed Draw Term Loan, 10/1/14 315,783 373,077 2.51 NR/Ba1 Flextronics Semiconductor, A3 Delayed Draw Term Loan, 10/1/14 368,413 -------------- $ 3,868,048 -------------- Total Technology Hardware & Equipment $ 3,868,048 - ------------------------------------------------------------------------------------------------------- SEMICONDUCTORS -- 0.5% Semiconductor Equipment -- 0.3% 3,815,656 4.31 B+/Ba3 Aeroflex, Inc., Tranche B1 Term Loan, 8/15/14 $ 3,789,423 - ------------------------------------------------------------------------------------------------------- Semiconductors -- 0.2% 1,531,163 4.75 BB/Ba2 Intersil Corp., Term Loan, 4/27/16 $ 1,544,943 1,000,000 5.00 NR/NR Microsemi Corp., Term Loan, 10/4/17 1,008,750 -------------- $ 2,553,693 -------------- Total Semiconductors $ 6,343,116 - ------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 61 Schedule of Investments | 12/31/10 (unaudited) (continued) - --------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - --------------------------------------------------------------------------------------------------------- TELECOMMUNICATION SERVICES -- 0.4% Integrated Telecommunication Services -- 0.3% 2,961,006 3.27 NR/NR Telesat Canada, Inc., U.S. Term I Loan, 10/31/14 $ 2,953,603 254,345 3.27 NR/NR Telesat Canada, Inc., U.S. Term II Loan, 10/31/14 253,709 -------------- $ 3,207,312 - --------------------------------------------------------------------------------------------------------- Wireless Telecommunication Services -- 0.1% 1,180,000 3.29 NR/NR Intelsat Jackson Holdings, Ltd., Term Loan, 2/1/14 $ 1,124,319 -------------- Total Telecommunication Services $ 4,331,631 - --------------------------------------------------------------------------------------------------------- UTILITIES -- 0.3% Electric Utilities -- 0.2% 395,000 3.76 BBB-/Ba1 Texas Competitive Electric Holdings, Delayed Draw Term Loan, 10/10/14 $ 303,602 3,812,066 3.76 BBB-/Ba1 Texas Competitive Electric Holdings, Initial Tranche B2 Term Loan, 10/10/14 2,952,836 -------------- $ 3,256,438 - --------------------------------------------------------------------------------------------------------- Independent Power Producer & Energy Traders -- 0.1% 968,589 3.15 B+/B1 Calpine Corp., 1st Priority Term Loan, 3/29/14 $ 969,108 -------------- Total Utilities $ 4,225,546 - --------------------------------------------------------------------------------------------------------- TOTAL SENIOR FLOATING RATE LOAN OBLIGATIONS (Cost $109,868,694) $ 112,020,377 - --------------------------------------------------------------------------------------------------------- TEMPORARY CASH INVESTMENTS -- 1.4% Repurchase Agreement -- 0.7% 2,930,000 NR/Aaa Deutsche Bank AG, 0.28%, dated 12/31/10, repurchase price of $1,000,000 plus accrued interest on 1/3/11 collateralized by $2,930,600 Federal National Mortgage Association, 7.0%, 8/1/38 $ 2,930,000 2,930,000 NR/Aaa JPMorgan, Inc., 0.20%, dated 12/31/10, repurchase price of $1,000,000 plus accrued interest on 1/3/11 collateralized by the following: $2,988,629 Federal National Mortgage Association, 4.0% - 5.0%, 2/1/20 - 3/1/40 2,930,000 The accompanying notes are an integral part of these financial statements. 62 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ---------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ---------------------------------------------------------------------------------------------------- Repurchase Agreement -- (continued) 2,930,000 NR/Aaa Societe Generale SA, 0.21%, dated 12/31/10, repurchase price of $2,988,600 plus accrued interest on 1/3/11 collateralized by $1,020,000 Federal National Mortgage Association, 4.5% - 6.5%, 6/1/33 - 1/1/40 $ 2,930,000 -------------- $ 8,790,000 - ---------------------------------------------------------------------------------------------------- SECURITIES LENDING COLLATERAL -- 0.7% (c) Certificates of Deposit: 255,151 Bank of Nova Scotia, 0.37%, 9/29/11 $ 255,151 178,606 BBVA Group NY, 0.61%, 7/26/11 178,606 186,118 BNP Paribas Bank NY, 0.1%, 1/3/11 186,118 127,576 BNP Paribas Bank NY, 0.29%, 2/8/11 127,576 127,576 BNP Paribas Bank NY, 0.3%, 1/20/11 127,576 255,151 Canadian Imperial Bank of Commerce NY, 0.29%, 4/27/11 255,151 255,151 DnB NOR Bank ASA NY, 0.25%, 3/7/11 255,151 127,568 National Australia Bank NY, 0.31%, 10/19/11 127,568 255,151 RoboBank Netherland NV NY, 0.31%, 8/8/11 255,151 255,151 Royal Bank of Canada NY, 0.44%, 12/2/11 255,151 127,576 SocGen NY, 0.30%, 2/10/11 127,576 255,151 Westpac Banking Corp. NY, 0.44%, 12/6/11 255,151 -------------- $ 2,405,926 - ---------------------------------------------------------------------------------------------------- Commercial Paper: 153,091 American Honda Finance, 0.30%, 5/4/11 $ 153,091 102,434 American Honda Finance, 1.05%, 6/20/11 102,434 93,728 Australia & New Zealand Banking Group, 0.89%, 8/4/11 93,728 259,927 Caterpillar Financial Services Corp., 1.05%, 6/24/11 259,927 280,666 CBA, 0.32%, 1/3/11 280,666 76,524 CHARFD, 0.26%, 2/8/11 76,524 127,545 FAIRPP, 0.27%, 2/2/11 127,545 130,992 FAIRPP, 0.27%, 3/7/11 130,992 255,173 Federal Home Loan Bank, 0.37%, 6/1/11 255,173 127,574 GE Corp., 0.34%, 1/26/11 127,574 127,619 General Electric Capital Corp., 0.38%, 4/28/11 127,619 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 63 Schedule of Investments | 12/31/10 (unaudited) (continued) - ------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (d) Ratings Amount ($) (unaudited) (unaudited) Value - ------------------------------------------------------------------------------------------------------- Commercial Paper: -- (continued) 25,505 General Electric Capital Corp., 0.38%, 6/6/11 $ 25,505 255,019 OLDLLC, 0.27%, 3/11/11 255,019 255,049 SEB, 0.39%, 2/7/11 255,049 306,180 SOCNAM, 0.1%, 1/3/11 306,180 127,562 SOCNAM, 0.29%, 1/14/11 127,562 152,994 STDFIN, 0.6%, 2/8/11 152,994 255,095 STRAIT, 0.25%, 2/2/11 255,095 127,567 TBLLC, 0.27%, 1/10/11 127,567 127,545 TBLLC, 0.27%, 2/2/11 127,545 255,151 Toyota Motor Credit Corp., 0.44%, 9/8/11 255,151 102,028 VARFUN, 0.26%, 2/14/11 102,028 155,513 VARFUN, 0.27%, 1/20/11 155,513 153,094 Wachovia, 0.40%, 3/22/11 153,094 102,127 Wachovia, 0.42%, 10/15/11 102,127 -------------- $ 4,135,702 - ------------------------------------------------------------------------------------------------------- Tri-party Repurchase Agreements: 372,521 Deutsche Bank Securities, Inc., 0.22%, 1/3/11 $ 372,521 510,303 HSBC Bank USA NA, 0.21%, 1/3/11 510,303 739,939 RBS Securities, Inc., 0.25%, 1/3/11 739,939 -------------- $ 1,622,763 - ------------------------------------------------------------------------------------------------------- Shares - ------------------------------------------------------------------------------------------------------- Money Market Mutual Funds: 408,242 Dreyfus Preferred Money Market Fund $ 408,242 408,242 Fidelity Prime Money Market Fund 408,242 -------------- $ 816,484 -------------- Total Securities Lending Collateral $ 8,980,875 - ------------------------------------------------------------------------------------------------------- TOTAL TEMPORARY CASH INVESTMENTS (Cost $17,770,875) $ 17,770,875 - ------------------------------------------------------------------------------------------------------- TOTAL INVESTMENT IN SECURITIES -- 99.7% (Cost $1,156,759,642) (a) $1,207,750,019 - ------------------------------------------------------------------------------------------------------- OTHER ASSETS AND LIABILITIES -- 0.3% $ 3,123,353 - ------------------------------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $1,210,873,372 - ------------------------------------------------------------------------------------------------------- * Non-income producing security. NR Not rated by either S&P or Moody's. WR Withdrawn rating. The accompanying notes are an integral part of these financial statements. 64 Pioneer Bond Fund | Semiannual Report | 12/31/10 (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 December 31, 2010, the value of these securities amounted to $83,110,152 or 6.9% of total net assets. ** Senior floating rate loan interests in which the Fund invests generally pay interest at rates that are periodically redetermined by reference to a base lending rate plus a premium. These base lending rates are generally (i) the lending rate offered by one or more major European banks, such as LIBOR (London InterBank Offered Rate), (ii) the prime rate offered by one or more major U.S. banks, (iii) the certificate of deposit or (iv) other base lending rates used by commercial lenders. The rate shown is the coupon rate at period end. (a) At December 31, 2010, the net unrealized gain on investments based on cost for federal income tax purposes of $1,157,046,051 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $77,814,815 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (27,110,847) ----------- Net unrealized gain $50,703,968 =========== (b) At December 31, 2010, the following securities were out on loan: - --------------------------------------------------------------------------------------------- Principal Amount ($) Security Value - --------------------------------------------------------------------------------------------- 1,260,000 Branch Banking & Trust Co., 4.875%, 1/15/13 $ 1,338,120 440,000 First Data Corp., 8.25%, 1/15/21 422,400 250,000 Intergen NV, 9.0%, 6/30/17 265,000 1,500,000 PNC Financial Services Group, Floating Rate Note, 5/29/49 1,599,450 200,000 Ras Laffan Liquefied Natural Gas Co., Ltd., III, 5.832%, 9/30/16 (144A) 215,000 5,000 Tyco Electronics Group SA, 6.55%, 10/1/17 5,682 4,700,000 Wells Fargo & Co., Floating Rate Note, 12/29/49 4,858,860 - --------------------------------------------------------------------------------------------- Total $ 8,704,512 ============================================================================================= (c) Securities lending collateral is managed by Credit Suisse AG, New York Branch. (d) Debt obligation with a variable interest rate. Rate shown is rate at end of period. (e) Security is in default and is non-income producing. Purchases and sales of securities (excluding temporary cash investments) for the six months ended December 31, 2010 were as follows: - -------------------------------------------------------------------------------- Purchases Sales - -------------------------------------------------------------------------------- Long-Term U.S. Government Securities $ 33,492,813 $ 59,263,561 Other Long-Term Securities $151,888,698 $180,037,613 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 65 Schedule of Investments | 12/31/10 (unaudited) (continued) Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. Highest priority is given to Level 1 inputs and lowest priority is given to Level 3. Level 1 -- quoted prices in active markets for identical securities Level 2 -- other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.) Level 3 -- significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) The following is a summary of the inputs used as of December 31, 2010, in valuing the Fund's assets: - ------------------------------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total - ------------------------------------------------------------------------------------------------------- Convertible Corporate Bonds $ -- $ 7,573,680 $ -- $ 7,573,680 Preferred Stocks 7,120,640 9,343,600 -- 16,464,240 Common Stock 592,260 -- -- 592,260 Asset Backed Securities -- 85,583,272 -- 85,583,272 Collateralized Mortgage Obligations -- 205,967,175 232,703 206,199,878 Corporate Bonds -- 496,766,086 -- 496,766,086 U.S. Government Agency Obligations -- 252,447,102 -- 252,447,102 Foreign Government Bonds -- 676,831 -- 676,831 Municipal Bonds -- 11,655,418 -- 11,655,418 Senior Floating Rate Loan Interests -- 112,020,377 -- 112,020,377 Temporary Cash Investments -- 16,954,391 -- 16,954,391 Money Market Mutual Funds 816,484 -- -- 816,484 - ------------------------------------------------------------------------------------------------------- Total $8,529,384 $1,198,987,932 $232,703 $1,207,750,019 - ------------------------------------------------------------------------------------------------------- Other Financial Instruments* $ -- $ 1,035,867 $ -- $ 1,035,867 ======================================================================================================= * Other financial instruments include futures contracts. Following is a reconciliation of assets using significant unobservable inputs (Level 3): - -------------------------------------------------------------------------------- Collateralized Mortgage Obligations - -------------------------------------------------------------------------------- Balance as of 6/30/10 $232,963 Realized gain (loss)(1) -- Change in unrealized appreciation (depreciation)(2) (260) Net purchases (sales) -- Transfers in and out of Level 3 -- - -------------------------------------------------------------------------------- Balance as of 12/31/10 $232,703 ================================================================================ 1 Realized gain (loss) on these securities is included in the net realized gain (loss) from investments in the Statement of Operations. 2 Unrealized appreciation (depreciation) on these securities is included in the change in unrealized gain (loss) on investments in the Statement of Operations. The accompanying notes are an integral part of these financial statements. 66 Pioneer Bond Fund | Semiannual Report | 12/31/10 Statement of Assets and Liabilities | 12/31/10 (unaudited) ASSETS: Investment in securities (including securities loaned of $8,704,512)(cost $1,156,759,642) $1,207,750,019 Cash 6,924,901 Futures Collateral 277,495 Receivables -- Investment securities sold 17,635 Fund shares sold 1,559,637 Dividends and interest 11,118,716 Due from Pioneer Investment Management, Inc. 75,195 Other 241,500 - ----------------------------------------------------------------------------------------- Total assets $1,227,965,098 - ----------------------------------------------------------------------------------------- LIABILITIES: Payables -- Investment securities purchased $ 2,437,575 Fund shares repurchased 2,435,419 Dividends 2,919,460 Upon return of securities loaned 8,980,875 Variation margin 53,373 Due to affiliates 172,728 Accrued expenses 92,296 - ----------------------------------------------------------------------------------------- Total liabilities $ 17,091,726 - ----------------------------------------------------------------------------------------- NET ASSETS: Paid-in capital $1,181,228,334 Undistributed net investment income 187,200 Accumulated net realized loss on investments and futures contracts (22,568,406) Net unrealized gain on investments 50,990,377 Net unrealized gain on futures contracts 1,035,867 - ----------------------------------------------------------------------------------------- Total net assets $1,210,873,372 - ----------------------------------------------------------------------------------------- NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Class A (based on $399,745,320/41,875,800 shares) $ 9.55 Class B (based on $23,489,400/2,475,418 shares) $ 9.49 Class C (based on $84,843,827/8,978,265 shares) $ 9.45 Class R (based on $21,048,791/2,184,410 shares) $ 9.64 Class Y (based on $681,022,114/71,947,299 shares) $ 9.47 Class Z (based on $723,920,/75,638 shares) $ 9.57 MAXIMUM OFFERING PRICE: Class A ($9.55 [divided by] 95.5%) $ 10.00 - ----------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 67 Statement of Operations (unaudited) For the Six Months Ended 12/31/10 INVESTMENT INCOME: Dividends $ 728,594 Interest 34,479,455 Income from securities loaned, net 13,765 - ---------------------------------------------------------------------------------------- Total investment income $35,221,814 - ---------------------------------------------------------------------------------------- EXPENSES: Management fees $3,142,283 Transfer agent fees Class A 188,664 Class B 38,656 Class C 32,030 Class R 2,306 Class Y 52,191 Class Z 249 Distribution fees Class A 533,555 Class B 130,474 Class C 436,715 Class R 50,047 Shareholder communications expense 425,472 Administrative reimbursements 207,725 Custodian fees 22,463 Registration fees 66,579 Professional fees 61,805 Printing expense 27,013 Fees and expenses of nonaffiliated trustees 19,849 Miscellaneous 65,691 - ---------------------------------------------------------------------------------------- Total expenses $ 5,503,767 Less fees waived and expenses reimbursed by Pioneer Investment Management, Inc. (375,311) - ---------------------------------------------------------------------------------------- Net expenses $ 5,128,456 - ---------------------------------------------------------------------------------------- Net investment income $30,093,358 - ---------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS AND FUTURES CONTRACTS: Net realized gain (loss) on: Investments $8,962,494 Class action 115,241 Futures contracts (122,836) $ 8,954,899 - ---------------------------------------------------------------------------------------- Change in net unrealized gain on: Investments $4,074,658 Futures contracts 1,035,867 $ 5,110,525 - ---------------------------------------------------------------------------------------- Net gain on investments and futures contracts $14,065,424 - ---------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $44,158,782 ======================================================================================== The accompanying notes are an integral part of these financial statements. 68 Pioneer Bond Fund | Semiannual Report | 12/31/10 Statements of Changes in Net Assets For the Six Months Ended 12/31/10 and the Year Ended 6/30/10, respectively - ------------------------------------------------------------------------------------------------ Six Months Ended 12/31/10 Year Ended (unaudited) 6/30/10 - ------------------------------------------------------------------------------------------------ FROM OPERATIONS: Net investment income $ 30,093,358 $ 57,136,766 Net realized gain on investments, class action and futures contracts 8,954,899 5,747,467 Change in net unrealized gain on investments and futures contracts 5,110,525 93,558,179 - ------------------------------------------------------------------------------------------------ Net increase in net assets resulting from operations $ 44,158,782 $ 156,442,412 - ------------------------------------------------------------------------------------------------ DISTRIBUTIONS TO SHAREOWNERS: Net investment income: Class A ($0.22 and $0.44 per share, respectively) $ (9,736,412) $ (16,791,891) Class B ($0.17 and $0.34 per share, respectively) (459,265) (1,152,065) Class C ($0.18 and $0.35 per share, respectively) (1,614,633) (2,598,981) Class R ($0.20 and $0.41 per share, respectively) (420,196) (773,008) Class Y ($0.23 and $0.45 per share, respectively) (17,421,680) (34,242,342) Class Z ($0.23 and $0.46 per share, respectively) (17,825) (27,059) - ------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (29,670,011) $ (55,585,346) - ------------------------------------------------------------------------------------------------ FROM FUND SHARE TRANSACTIONS: Net proceeds from sale of shares $ 214,204,975 $ 512,301,758 Reinvestment of distributions 15,492,474 24,975,542 Cost of shares repurchased (296,027,010) (385,687,490) - ------------------------------------------------------------------------------------------------ Net increase (decrease) in net assets resulting from Fund share transactions $ (66,329,561) $ 151,589,810 - ------------------------------------------------------------------------------------------------ Net increase (decrease) in net assets $ (51,840,790) $ 252,446,876 NET ASSETS: Beginning of period 1,262,714,162 1,010,267,286 - ------------------------------------------------------------------------------------------------ End of period $1,210,873,372 $1,262,714,162 - ------------------------------------------------------------------------------------------------ Undistributed net investment income $ 187,200 $ (236,147) ================================================================================================ The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 69 Statements of Changes in Net Assets (continued) - -------------------------------------------------------------------------------------------------------- '10 Shares '10 Amount '09 Shares '09 Amount (unaudited) (unaudited) - -------------------------------------------------------------------------------------------------------- Class A Shares sold 11,421,796 $109,303,289 21,985,150 $203,489,130 Reinvestment of distributions 788,439 7,581,814 1,317,083 12,121,485 Less shares repurchased (14,889,028) (143,005,496) (15,830,311) (145,512,861) - -------------------------------------------------------------------------------------------------------- Net increase (decrease) (2,678,793) $(26,120,393) 7,471,922 $ 70,097,754 ======================================================================================================== Class B Shares sold 140,120 $ 1,334,146 726,217 $ 6,600,255 Reinvestment of distributions 43,175 412,612 99,213 904,650 Less shares repurchased (621,277) (5,919,125) (1,612,539) (14,702,859) - -------------------------------------------------------------------------------------------------------- Net decrease (437,982) $ (4,172,367) (787,109) $ (7,197,954) ======================================================================================================== Class C Shares sold 1,289,133 $ 12,259,781 4,303,908 $ 39,005,155 Reinvestment of distributions 111,731 1,063,179 180,063 1,639,251 Less shares repurchased (1,190,060) (11,294,837) (1,928,805) (17,523,873) - -------------------------------------------------------------------------------------------------------- Net increase 210,804 $ 2,028,123 2,555,166 $ 23,120,533 ======================================================================================================== Class R Shares sold 681,443 $ 6,595,105 904,665 $ 8,267,967 Reinvestment of distributions 32,128 311,831 57,659 534,364 Less shares repurchased (438,403) (4,255,448) (821,575) (7,571,493) - -------------------------------------------------------------------------------------------------------- Net increase 275,168 $ 2,651,488 140,749 $ 1,230,838 ======================================================================================================== Class Y Shares sold 8,887,003 $ 84,656,052 28,285,000 $254,508,292 Reinvestment of distributions 641,439 6,117,904 1,070,227 9,769,546 Less shares repurchased (13,853,132) (131,485,438) (22,010,808) (200,233,538) - -------------------------------------------------------------------------------------------------------- Net increase (decrease) (4,324,690) $(40,711,482) 7,344,419 $ 64,044,300 ======================================================================================================== Class Z Shares sold 5,916 $ 56,602 46,777 $ 430,959 Reinvestment of distributions 532 5,134 673 6,246 Less shares repurchased (6,926) (66,666) (15,424) (142,866) - -------------------------------------------------------------------------------------------------------- Net increase (decrease) (478) $ (4,930) 32,026 $ 294,339 ======================================================================================================== The accompanying notes are an integral part of these financial statements. 70 Pioneer Bond Fund | Semiannual Report | 12/31/10 Financial Highlights - ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 12/31/10 Ended Ended Ended Ended Ended (unaudited) 6/30/10 6/30/09 6/30/08 6/30/07 6/30/06 - ------------------------------------------------------------------------------------------------------------------------------------ Class A Net asset value, beginning of period $ 9.44 $ 8.63 $ 9.10 $ 8.95 $ 8.89 $ 9.40 - ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.22 $ 0.45 $ 0.50 $ 0.43 $ 0.40 $ 0.35 Net realized and unrealized gain (loss) on investments 0.11 0.80 (0.31) 0.16 0.07 (0.47) - ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.33 $ 1.25 $ 0.19 $ 0.59 $ 0.47 $ (0.12) Distributions to shareowners: Net investment income (0.22) (0.44) (0.55) (0.44) (0.41) (0.39) Net realized gain -- -- (0.11) -- -- -- - ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 0.11 $ 0.81 $ (0.47) $ 0.15 $ 0.06 $ (0.51) - ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 9.55 $ 9.44 $ 8.63 $ 9.10 $ 8.95 $ 8.89 ==================================================================================================================================== Total return* 3.52% 14.71% 2.65% 6.64% 5.31% (1.25)% Ratio of net expenses to average net assets+ 0.85%** 0.85% 0.89%(a) 1.00% 1.00% 1.00% Ratio of net investment income to average net assets+ 4.63%** 4.86% 5.88% 4.60% 4.48% 3.91% Portfolio turnover rate 30% 41% 34% 73% 31% 60% Net assets, end of period (in thousands) $399,745 $420,706 $ 320,036 $265,959 $284,592 $208,454 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.03%** 1.07% 1.09% 1.04% 1.00% 1.11% Net investment income 4.45%** 4.64% 5.68% 4.56% 4.48% 3.80% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.85%** 0.85% 0.89%(a) 1.00% 1.00% 1.00% Net investment income 4.63%** 4.86% 5.88% 4.60% 4.48% 3.91% ==================================================================================================================================== * 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. + Ratio with no reduction for fees paid indirectly. (a) On October 1, 2008, Pioneer contractually lowered Class A shares' expense limitation from 1.00% to 0.85% of the average daily net assets attributable to Class A shares. The expense limit will be in effect through November 1, 2013. The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 71 Financial Highlights (continued) - ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 12/31/10 Ended Ended Ended Ended Ended (unaudited) 6/30/10 6/30/09 6/30/08 6/30/07 6/30/06 - ------------------------------------------------------------------------------------------------------------------------------------ Class B Net asset value, beginning of period $ 9.38 $ 8.58 $ 9.05 $ 8.90 $ 8.85 $ 9.36 - ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.17 $ 0.35 $ 0.42 $ 0.34 $ 0.33 $ 0.27 Net realized and unrealized gain (loss) on investments 0.11 0.79 (0.31) 0.16 0.05 (0.47) - ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.28 $ 1.14 $ 0.11 $ 0.50 $ 0.38 $ (0.20) Distributions to shareowners: Net investment income (0.17) (0.34) (0.47) (0.35) (0.33) (0.31) Net realized gain -- -- (0.11) -- -- -- - ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 0.11 $ 0.80 $ (0.47) $ 0.15 $ 0.05 $ (0.51) - ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 9.49 $ 9.38 $ 8.58 $ 9.05 $ 8.90 $ 8.85 ==================================================================================================================================== Total return* 2.99% 13.47% 1.62% 5.70% 4.26% (2.14)% Ratio of net expenses to average net assets+ 1.90%** 1.90% 1.90% 1.90% 1.92% 1.90% Ratio of net investment income to average net assets+ 3.59%** 3.89% 4.90% 3.72% 3.55% 3.06% Portfolio turnover rate 30% 41% 34% 73% 31% 60% Net assets, end of period (in thousands) $ 23,489 $ 27,342 $ 31,738 $ 34,106 $ 36,366 $ 49,552 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.90%** 1.98% 1.99% 1.90% 2.02% 1.99% Net investment income 3.59%** 3.81% 4.81% 3.72% 3.45% 2.97% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.90%** 1.90% 1.90% 1.89% 1.90% 1.90% Net investment income 3.59%** 3.89% 4.90% 3.73% 3.57% 3.06% ==================================================================================================================================== * 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. + Ratio with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. 72 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 12/31/10 Ended Ended Ended Ended Ended (unaudited) 6/30/10 6/30/09 6/30/08 6/30/07 6/30/06 - ------------------------------------------------------------------------------------------------------------------------------------ Class C Net asset value, beginning of period $ 9.34 $ 8.54 $ 9.02 $ 8.87 $ 8.81 $ 9.32 - ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.18 $ 0.37 $ 0.42 $ 0.35 $ 0.33 $ 0.28 Net realized and unrealized gain (loss) on investments 0.11 0.78 (0.31) 0.16 0.06 (0.47) - ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.29 $ 1.15 $ 0.11 $ 0.51 $ 0.39 $ (0.19) Distributions to shareowners: Net investment income (0.18) (0.35) (0.48) (0.36) (0.33) (0.32) Net realized gain -- -- (0.11) -- -- -- - ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 0.11 $ 0.80 $ (0.48) $ 0.15 $ 0.06 $ (0.51) - ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 9.45 $ 9.34 $ 8.54 $ 9.02 $ 8.87 $ 8.81 ==================================================================================================================================== Total return* 3.08% 13.63% 1.62% 5.80% 4.39% (2.08)% Ratio of net expenses to average net assets+ 1.71%** 1.79% 1.83% 1.82% 1.85% 1.89% Ratio of net investment income to average net assets+ 3.78%** 3.91% 4.93% 3.79% 3.62% 3.07% Portfolio turnover rate 30% 41% 34% 73% 31% 60% Net assets, end of period (in thousands) $ 84,844 $81,892 $53,045 $35,784 $30,934 $35,942 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.71%** 1.79% 1.83% 1.82% 1.85% 1.89% Net investment income 3.78%** 3.91% 4.93% 3.79% 3.62% 3.07% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.71%** 1.79% 1.83% 1.82% 1.84% 1.89% Net investment income 3.78%** 3.91% 4.93% 3.79% 3.63% 3.07% ==================================================================================================================================== * 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. + Ratio with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 73 Financial Highlights (continued) - ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 12/31/10 Ended Ended Ended Ended Ended (unaudited) 6/30/10 6/30/09 6/30/08 6/30/07 6/30/06 - ------------------------------------------------------------------------------------------------------------------------------------ Class R Net asset value, beginning of period $ 9.52 $ 8.71 $ 9.18 $ 9.05 $ 8.99 $ 9.50 - ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.21 $ 0.42 $ 0.48 $ 0.40 $ 0.39 $ 0.34 Net realized and unrealized gain (loss) on investments 0.11 0.80 (0.31) 0.15 0.06 (0.47) - ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.32 $ 1.22 $ 0.17 $ 0.55 $ 0.45 $ (0.13) Distributions to shareowners: Net investment income (0.20) (0.41) (0.53) (0.42) (0.39) (0.38) Net realized gain -- -- (0.11) -- -- -- - ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 0.12 $ 0.81 $ (0.47) $ 0.13 $ 0.06 $ (0.51) - ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 9.64 $ 9.52 $ 8.71 $ 9.18 $ 9.05 $ 8.99 ==================================================================================================================================== Total return* 3.41% 14.18% 2.35% 6.15% 5.04% (1.43)% Ratio of net expenses to average net assets+ 1.15%** 1.25% 1.25% 1.25% 1.25% 1.25% Ratio of net investment income to average net assets+ 4.34%** 4.50% 5.53% 4.35% 4.24% 3.50% Portfolio turnover rate 30% 41% 34% 73% 31% 60% Net assets, end of period (in thousands) $ 21,049 $18,186 $15,404 $11,263 $ 6,511 $ 3,042 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.15%** 1.26% 1.30% 1.31% 1.44% 1.46% Net investment income 4.34%** 4.49% 5.48% 4.30% 4.05% 3.29% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.15%** 1.25% 1.25% 1.25% 1.25% 1.25% Net investment income 4.34%** 4.50% 5.53% 4.35% 4.24% 3.50% ==================================================================================================================================== * 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. + Ratio with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. 74 Pioneer Bond Fund | Semiannual Report | 12/31/10 - ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 12/31/10 Ended Ended Ended Ended Ended (unaudited) 6/30/10 6/30/09 6/30/08 6/30/07 6/30/06 - ------------------------------------------------------------------------------------------------------------------------------------ Class Y Net asset value, beginning of period $ 9.36 $ 8.55 $ 9.02 $ 8.88 $ 8.83 $ 9.33 - ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.23 $ 0.47 $ 0.53 $ 0.45 $ 0.44 $ 0.39 Net realized and unrealized gain (loss) on investments 0.11 0.79 (0.31) 0.16 0.06 (0.46) - ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.34 $ 1.26 $ 0.22 $ 0.61 $ 0.50 $ (0.07) Distributions to shareowners: Net investment income (0.23) (0.45) (0.58) (0.47) (0.45) (0.43) Net realized gain -- -- (0.11) -- -- -- - ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 0.11 $ 0.81 $ (0.47) $ 0.14 $ 0.05 $ (0.50) - ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 9.47 $ 9.36 $ 8.55 $ 9.02 $ 8.88 $ 8.83 ==================================================================================================================================== Total return* 3.66% 15.06% 2.95% 6.91% 5.65% (0.77)% Ratio of net expenses to average net assets+ 0.61%** 0.61% 0.63% 0.59% 0.57% 0.58% Ratio of net investment income to average net assets+ 4.88%** 5.13% 6.10% 5.02% 4.89% 4.20% Portfolio turnover rate 30% 41% 34% 73% 31% 60% Net assets, end of period (in thousands) $681,022 $713,869 $589,661 $710,219 $613,523 $521,480 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.61%** 0.61% 0.64% 0.61% 0.57% 0.58% Net investment income 4.88%** 5.13% 6.09% 5.00% 4.89% 4.20% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.61%** 0.61% 0.63% 0.59% 0.57% 0.58% Net investment income 4.88%** 5.13% 6.10% 5.02% 4.89% 4.20% ==================================================================================================================================== * 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. + Ratio with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/10 75 Financial Highlights (continued) Six Months Ended Year Year 12/31/10 Ended Ended 7/6/07 (a) (unaudited) 6/30/10 6/30/09 to 6/30/08 Class Z Net asset value, beginning of period $9.46 $ 8.67 $ 9.10 $ 8.89 - ----------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income $0.24 $ 0.48 $ 0.54 $ 0.45 Net realized and unrealized gain (loss) on investments 0.10 0.77 (0.28) 0.22 - ----------------------------------------------------------------------------------------------------------------------- Net increase from investment operations $0.34 $ 1.25 $ 0.26 $ 0.67 Distributions to shareowners: Net investment income (0.23) (0.46) (0.58) (0.46) Net realized gain -- -- (0.11) -- - ----------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $0.11 $ 0.79 $(0.43) $ 0.21 - ----------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $9.57 $ 9.46 $ 8.67 $ 9.10 ======================================================================================================================= Total return* 3.63% 14.68% 3.42% 7.63%(b) Ratio of net expenses to average net assets+ 0.65%** 0.63% 0.65% 0.58%** Ratio of net investment income to average net assets+ 4.84%** 5.00% 5.91% 5.00%** Portfolio turnover rate 30% 41% 34% 73% Net assets, end of period (in thousands) $ 724 $ 720 $ 382 $ 102 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.65%** 0.63% 0.67% 0.58%** Net investment income 4.84%** 5.00% 5.89% 5.00%** Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.65%** 0.63% 0.65% 0.58%** Net investment income 4.84%** 5.00% 5.91% 5.00%** ======================================================================================================================= (a) Class Z shares were first publicly offered on July 6, 2007. (b) Not annualized. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, and the complete redemption of the investment at net asset value at the end of each period. ** Annualized. + Ratios with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. 76 Pioneer Bond Fund | Semiannual Report | 12/31/10 Notes to Financial Statements | 12/31/10 (unaudited) 1. Organization and Significant Accounting Policies Pioneer Bond Fund (the Fund) is a Delaware statutory trust registered under the Investment Company Act of 1940 as a diversified, open-end management investment company. The investment objective of the Fund is to seek current income consistent with preservation of capital. The Fund offers six classes of shares designated as Class A, Class B, Class C, Class R, Class Y and Class Z shares. Class Z shares were first publicly offered on July 6, 2007. 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 or Class Z shares. Class B shares convert to Class A shares approximately eight years after the date of purchase. At times, the Fund's investments may represent industries or industry sectors that are interrelated or have common risks, making the Fund more susceptible to any economic, political, or regulatory developments or other risks affecting those industries and sectors. The Fund's prospectus contains unaudited information regarding the Fund's principal risks. Please refer to that document when considering the Fund's principal risks. The Fund's financial statements have been prepared in conformity with U.S. generally accepted accounting principles that require the management of the Fund to, among other things, make estimates and assumptions that affect the Pioneer Bond Fund | Semiannual Report | 12/31/10 77 reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of income, expenses and gains and losses on investments during the reporting period. Actual results could differ from those estimates. 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. Senior floating rate loan interests (senior loans) are valued in accordance with guidelines established by the Board of Trustees at the mean between the last available bid and asked prices from one or more brokers or dealers as obtained from Loan Pricing Corporation. Senior loans for which no reliable price quotes are available will be valued by Loan Pricing Corporation through the use of pricing matrices to determine valuations. 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. Securities or loans for which independent pricing services are unable to supply prices or for which market prices and/or quotations are not readily available or are considered to be unreliable are valued using fair value methods pursuant to procedures adopted by the Board of Trustees. The Fund may use fair value methods if it is determined that a significant event has occurred after the close of the exchange or market on which the security trades and prior to the determination of the Fund's net asset value. Thus, the valuation of the Fund's securities may differ from exchange prices. At December 31, 2010, there was one security that was valued using fair value methods (in addition to securities that were valued using prices supplied by independent pricing services) representing 0.02% of net assets. Inputs used when applying fair value methods to value a security may include credit ratings, the financial condition of the company, current market conditions and comparable securities. Short-term fixed income securities with remaining maturities of sixty days or less generally are valued at amortized cost. Money market mutual funds are valued at net asset value. 78 Pioneer Bond Fund | Semiannual Report | 12/31/10 Principal amounts of mortgage-backed securities are adjusted for monthly paydowns. Premiums and discounts related to certain mortgage-backed securities are amortized or accreted in proportion to the monthly paydowns. All discounts/premiums on debt securities are accreted/amortized for financial reporting purposes over the life of the respective securities, and such accretion/amortization is included in interest income. 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. B. Federal Income Taxes It is the Fund's policy to comply with the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute all of its taxable income and net realized capital gains, if any, to its shareowners. Therefore, no federal income tax provision is required. Tax years for the prior three fiscal years remain subject to examination by tax authorities. 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 distributions paid will be determined at the end of the current taxable year. The tax character of distributions paid during the year ended June 30, 2010 was as follows: - -------------------------------------------------------------------------------- 2010 - -------------------------------------------------------------------------------- Distributions paid from: Ordinary income $55,585,346 Long-term capital gain -- - -------------------------------------------------------------------------------- Total $55,585,346 ================================================================================ Pioneer Bond Fund | Semiannual Report | 12/31/10 79 The following shows the components of distributable earnings on a federal income tax basis at June 30, 2010. - -------------------------------------------------------------------------------- 2010 - -------------------------------------------------------------------------------- Distributable earnings: Undistributed ordinary income $ 1,903,129 Capital loss carryforward (33,533,387) Dividends payable (2,042,692) Unrealized appreciation 48,829,217 - -------------------------------------------------------------------------------- Total $ 15,156,267 ================================================================================ The difference between book-basis and tax-basis unrealized appreciation is attributable to the tax deferral of losses on wash sales, adjustments relating to catastrophe bonds, interest on defaulted bonds, and the tax treatment of premium and amortization. C. Fund Shares The Fund records sales and repurchases of its shares as of trade date. Pioneer Funds Distributor, Inc. (PFD), the principal underwriter for the Fund and a wholly owned indirect subsidiary of UniCredit S.p.A. (UniCredit), earned $71,340 in underwriting commissions on the sale of Class A shares during the six months ended December 31, 2010. D. Class Allocations Income, common expenses, and realized and unrealized gains and losses are calculated at the Fund level and allocated daily to each class of shares based on its respective percentage of adjusted net assets at the beginning of the day. During the period, the Fund recognized gains of $115,241 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 and Class Z 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 80 Pioneer Bond Fund | Semiannual Report | 12/31/10 to Class A, Class B, Class C, Class R, Class Y and Class Z shares can reflect different transfer agent and distribution expense rates. E. Futures Contracts The Fund may enter into futures transactions to hedge against changes in interest rates, securities prices and currency exchange rates or to seek to increase total return. Futures contracts are types of derivatives. All futures contracts entered into by the Fund are traded on a futures exchange. Upon entering into a futures contract, the Fund is required to deposit with a broker an amount of cash or securities equal to the minimum "initial margin" requirements of the associated futures exchange. Subsequent payments for futures contracts ("variation margin") are paid or received by the Fund, depending on the daily fluctuation in the value of the contracts, and are recorded by the Fund as unrealized gains or losses. When the contract is closed, the Fund realizes a gain or loss equal to the difference between the opening and closing value of the contract as well as any fluctuation in foreign currency exchange rates where applicable. Futures contracts are subject to market risk, interest rate risk and currency exchange rate risk. Changes in value of the contracts may not directly correlate to the changes in value of the underlying securities. These risks may decrease the effectiveness of the Fund's hedging strategies and potentially result in a loss. With futures, there is minimal counterparty credit risk to the Fund since futures are exchange-traded and the exchange's clearinghouse, as counterparty to all exchange-traded futures, guarantees the futures against default. The average value of contracts open during the six months ended December 31, 2010 was 309. At December 31, 2010, open futures contracts were as follows: - -------------------------------------------------------------------------------- Number of Contracts Settlement Fair Unrealized Type Long/(Short) Month Value Gain/(Loss) - -------------------------------------------------------------------------------- U.S. 10 Year Note (254) 3/11 $30,591,125 $ 1,025,922 U.S. 2 Year Note (CBT) (70) 3/11 15,323,434 32,031 U.S. 5 Year Note (CBT) 257 3/11 30,253,732 (22,086) - -------------------------------------------------------------------------------- $ 1,035,867 - -------------------------------------------------------------------------------- F. 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 Bond Fund | Semiannual Report | 12/31/10 81 G. Securities Lending The Fund lends securities in its portfolio to certain broker-dealers or other institutional investors. When entering into a securities loan transaction, the Fund typically receives cash collateral from the borrower equal to at least the value of the securities loaned, which is invested in temporary investments. Credit Suisse AG, New York Branch, as the Fund's securities lending agent, manages the Fund's securities lending collateral. The income earned on the investment of collateral is shared with the borrower and the lending agent in payment of any rebate due to the borrower with respect to the securities loan, and in compensation for the lending agent's services to the Fund. The Fund also continues to receive payments in lieu of dividends or interest on the securities loaned. Gain or loss on the value of the loaned securities that may occur during the term of the loan will be for the account of the Fund. The amount of the collateral is required to be adjusted daily to reflect any price fluctuation in the value of the loaned securities. If the required market value of the collateral is less than the value of the loaned securities, the borrower is required to deliver additional collateral for the account of the Fund prior to the close of business on that day. The Fund has the right, under the lending agreement, to terminate the loan and recover the securities from the borrower with prior notice. The Fund is required to return the cash collateral to the borrower and could suffer a loss if the value of the collateral, as invested, has declined. 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 0.50% of the Fund's average daily net assets up to $1 billion; 0.45% of the next $1 billion; and 0.40% of the excess over $2 billion. For the six months ended December 31, 2010, the effective management fee (excluding waivers and/or assumption of expenses) was equal to 0.49% of the Fund's average daily net assets. PIM has contractually agreed to limit ordinary operating expenses to the extent required to reduce Fund expenses to 0.85%, 1.90%, 1.90%, 1.25%, 0.76% and 0.65% of the average daily net assets attributable to Class A, Class B, Class C, Class R, Class Y and Class Z shares, respectively. Expenses waived during the period ended December 31, 2010 are reflected on the Statement of Operations. These expense limitations are in effect through November 1, 2013 for Class A and Class Z shares, through November 1, 2012 for Class B, Class C and Class R shares and through June 1, 2012 for Class Y shares. There can be no assurance that PIM will extend the expense limitation agreement for a class of shares beyond the date referred to above. 82 Pioneer Bond Fund | Semiannual Report | 12/31/10 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 $21,769 in management fees, administrative costs and certain other reimbursements payable to PIM at December 31, 2010. 3. Transfer Agent PIMSS, a wholly owned indirect subsidiary of UniCredit, provides substantially all transfer agent and shareowner services to the Fund at negotiated rates. In addition, the Fund reimburses PIMSS for out-of-pocket expenses incurred by PIMSS related to shareholder communications activities such as proxy and statement mailings, outgoing phone calls and omnibus relationship contracts. For the six months ended December 31, 2010, such out-of-pocket expenses by class of shares were as follows: - -------------------------------------------------------------------------------- Shareholder Communications: - -------------------------------------------------------------------------------- Class A $267,059 Class B 5,140 Class C 33,637 Class R 6,650 Class Y 112,921 Class Z 65 - -------------------------------------------------------------------------------- Total: $425,472 ================================================================================ Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $144,994 in transfer agent fees and out-of-pocket reimbursements payable to PIMSS at December 31, 2010. 4. Distribution and Service Plans The Fund has adopted a Distribution Plan pursuant to Rule 12b-1 of the Investment Company Act of 1940 with respect to its Class A, Class B, Class C and Class R shares. Pursuant to the Plan, the Fund pays PFD 0.25% of the average daily net assets attributable to Class A shares as compensation for personal services and/or account maintenance services or distribution services with regard to Class A shares. Pursuant to the Plan, the Fund also pays PFD 1.00% of the average daily net assets attributable to Class B and Class C shares. The fee for Class B and Class C shares consists of a 0.25% service fee and a 0.75% distribution fee paid as compensation for personal services and/or account maintenance services or distribution services with regard to Class B and Class C shares. Pursuant to the Plan, the Fund further pays PFD 0.50% of the average daily net assets attributable to Class R shares for distribution services. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $5,965 in distribution fees payable to PFD at December 31, 2010. Pioneer Bond Fund | Semiannual Report | 12/31/10 83 The Fund also has adopted a separate service plan for Class R shares (Service Plan). The Service Plan authorizes the Fund to pay securities dealers, plan administrators or other service organizations that agree to provide certain services to retirement plans or plan participants holding shares of the Fund a service fee of up to 0.25% of the Fund's average daily net assets attributable to Class R shares held by such plans. In addition, redemptions of each class of shares (except Class R, Class Y and Class Z shares) may be subject to a contingent deferred sales charge (CDSC). A CDSC of 1.00% may be imposed on redemptions of certain net asset value purchases of Class A shares within 18 months of purchase (within 12 months for purchases made on or after April 1, 2009). Class B shares that are redeemed within five years of purchase are subject to a CDSC at declining rates beginning at 4.00%, based on the lower of cost or market value of shares being redeemed. Redemptions of Class C shares within one year of purchase are subject to a CDSC of 1.00%, based on the lower of cost or market value of shares being redeemed. Shares purchased as part of an exchange remain subject to any CDSC that applied to the original purchase of those shares. There is no CDSC for Class R, Class Y or Class Z shares. Proceeds from the CDSCs are paid to PFD. For the six months ended December 31, 2010, CDSCs in the amount of $102,553 were paid to PFD. 5. Expense Offset Arrangements The Fund has entered into certain expense offset arrangements with PIMSS that 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 December 31, 2010, the Fund's expenses were not reduced under such arrangements. 6. Reorganization Information On May 8, 2009, beneficial owners of Regions Morgan Keegan Select Fixed Income Fund approved a proposed Agreement and Plan of Reorganization that provided for the reorganization listed below. The purpose of this transaction was to combine two funds with similar investment objectives and strategies. This tax-free reorganization was accomplished on May 15, 2009 ("Closing Date"), by exchanging the assets and stated liabilities of Regions Morgan Keegan Select Fixed Income Fund for shares of Pioneer Bond Fund. Shareowners holding Class A and Class I shares of Regions Morgan Keegan Select Fixed Income Fund received Class A and Class Y shares, respectively, of Pioneer Bond Fund in the reorganization. Shareowners holding Class C shares of Regions Morgan Keegan Select Fixed Income Fund received Class A shares of Pioneer Bond Fund. The investment portfolio of Regions Morgan Keegan Select Fixed Income Fund, with a value of $103,155,802 and an identified cost of $104,563,375 at May 15, 2009, was the principal asset acquired by Pioneer Bond Fund. For financial reporting purposes, assets received by Pioneer Bond Fund were valued using closing market prices or available market quotations 84 Pioneer Bond Fund | Semiannual Report | 12/31/10 and shares issued by Pioneer Bond Fund were recorded at net asset value; however, the cost basis of the investments received from Regions Morgan Keegan Select Fixed Income Fund was carried forward to align ongoing reporting of Pioneer Bond Fund's realized and unrealized gains and losses with amounts distributable to shareowners for tax purposes. The following charts show the details of the reorganization as of that Closing Date: - ----------------------------------------------------------------------------------------- Regions Morgan Pioneer Keegan Select Pioneer Bond Fund Fixed Income Fund Bond Fund (Pre-Reorganization) (Pre-Reorganization) (Post-Reorganization) - ----------------------------------------------------------------------------------------- Net Assets Class A $276,477,901 $ 36,518,366 $313,960,037 Class B $ 31,100,916 $ -- $ 31,100,916 Class C $ 48,515,093 $ 963,769 $ 48,515,093 Class R $ 15,664,037 $ -- $ 15,664,037 Class Y/I $518,695,851 $ 71,406,867 $590,102,718 Class Z $ 373,324 $ -- $ 373,324 - ------------------------------------------------------------------------------------ Total Net Assets $890,827,123 $108,889,002 $999,716,125 - ------------------------------------------------------------------------------------ Shares Outstanding Class A 32,629,637 4,117,511 37,054,919 Class B 3,692,276 -- 3,692,276 Class C 5,783,455 108,700 5,783,455 Class R 1,830,795 -- 1,830,795 Class Y/I 61,769,449 8,054,285 70,270,266 Class Z 43,870 -- 43,870 Shares Issued in Reorganization Class A 4,425,282 Class Y 8,500,817 - ----------------------------------------------------------------------------------------- Unrealized Accumulated Depreciation On Loss On Closing Date Closing Date - ----------------------------------------------------------------------------------------- Regions Morgan Keegan Select Fixed Income Fund $(1,407,573) $(7,590,952) Since the combined investment portfolios have been managed as a single integrated portfolio since the reorganization was completed, it is not practical to separate the amounts of revenue and earnings of Regions Morgan Keegan Select Fixed Income Fund that have been included in Pioneer Bond Fund's statement of operations since May 15, 2009. Pioneer Bond Fund | Semiannual Report | 12/31/10 85 7. Additional Disclosures about Derivative Instruments and Hedging Activities: Values of derivative instruments as of December 31, 2010 were as follows: - -------------------------------------------------------------------------------- Derivatives Not Accounted for as Hedging Instruments Under Accounting Standards Codification (ASC) 815 (formerly FASB Statement 133) Asset Derivatives 2010 Liabilities Derivatives 2010 - -------------------------------------------------------------------------------- Balance Balance Sheet Location Value Sheet Location Value - -------------------------------------------------------------------------------- Interest Rate Futures Receivables $-- Payables* $53,373 - -------------------------------------------------------------------------------- Total - -------------------------------------------------------------------------------- * Represents the unrealized depreciation on futures. Receivable for variation margin on open futures contracts reflects unsettled variation margin. The effect of derivative instruments on the Statement of Operations for the six months ended December 31, 2010 was as follows: Derivatives Not Accounted for as Hedging Instruments Change in Under Accounting Realized Gain Unrealized Standards Codification or (Loss) on Gain or (Loss) (ASC) 815 Derivatives on Derivatives (formerly FASB Location of Gain or (Loss) Recognized Recognized Statement 133) on Derivatives Recognized in Income in Income in Income - ---------------------------------------------------------------------------------------------------------- Interest Rate Futures Net realized loss on futures contracts $(122,836) Interest Rate Futures Change in unrealized gain on futures contracts $1,035,867 ========================================================================================================== 8. Subsequent Events In preparing these financial statements, PIM has evaluated the impact of all events and transactions for potential recognition or disclosure and has determined that there were no subsequent events requiring recognition or disclosure in the financial statements. 86 Pioneer Bond Fund | Semiannual Report | 12/31/10 Approval of Investment Advisory Agreement Pioneer Investment Management, Inc. (PIM) serves as the investment adviser to Pioneer Bond Fund (the Fund) pursuant to an investment advisory agreement between PIM and the Fund. In order for PIM to remain the investment adviser of the Fund, the Trustees of the Fund must determine annually whether to renew the investment advisory agreement for the Fund. The contract review process began in March 2010 as the Trustees of the Fund agreed on, among other things, an overall approach and timeline for the process. In July 2010, the Trustees approved the format of the contract review materials and submitted their formal request to PIM to furnish information necessary to evaluate the terms of the investment advisory agreement. The contract review materials were provided to the Trustees in September 2010. After reviewing and discussing the materials, the Trustees submitted a request for additional information to PIM, and materials were provided in response to this request. Meetings of the independent Trustees of the Fund were held in July, September, October, and November, 2010 to review and discuss the contract review materials. In addition, the Trustees took into account the information related to the Fund provided to the Trustees at each regularly scheduled meeting. At a meeting held on November 16, 2010, based on their evaluation of the information provided by PIM and third parties, the Trustees of the Fund, including the independent Trustees voting separately, unanimously approved the renewal of the investment advisory agreement for another year. In considering the renewal of the investment advisory agreement, the Trustees considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the renewal of the agreement. Nature, Extent and Quality of Services The Trustees considered the nature, extent and quality of the services that had been provided by PIM to the Fund, taking into account the investment objective and strategy of the Fund. The Trustees reviewed the terms of the investment advisory agreement. The Trustees also reviewed PIM's investment approach for the Fund, its research process and its process for trade execution. The Trustees considered the resources of PIM and the personnel of PIM who provide investment management services to the Fund. The Trustees considered the non-investment resources and personnel of PIM involved in PIM's services to the Fund, including PIM's compliance and legal resources and personnel. In addition, the Trustees considered the arrangements put in place to retain key investment and other personnel. The Trustees also considered the substantial Pioneer Bond Fund | Semiannual Report | 12/31/10 87 attention and high priority given by PIM's senior management to the Pioneer fund complex. The Trustees considered that PIM supervises and monitors the performance of the Fund's service providers and provides the Fund with personnel (including Fund officers) and other resources that are necessary for the Fund's business management and operations. The Trustees also considered that, as administrator, PIM is responsible for the administration of the Fund's business and other affairs. The Trustees considered the fees paid to PIM for the provision of administration services. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that had been provided by PIM to the Fund were satisfactory and consistent with the terms of the investment advisory agreement. Performance of the Fund The Trustees considered the performance results of the Fund over various time periods. They reviewed information comparing the Fund's performance with the performance of its peer group of funds as classified by Morningstar, Inc. (Morningstar), an independent provider of investment company data, and with the performance of the Fund's benchmark index. The Trustees considered that the Fund's annualized total return was in the second quintile of its Morningstar category for the one, three and five year periods ended June 30, 2010, and in the first quintile of its Morningstar category for the one year period ended June 30, 2010. (In all quintile rankings referred to throughout this disclosure, first quintile is most favorable to the Fund's shareowners. Thus, highest relative performance would be first quintile and lowest relative expenses would also be first quintile.) The Trustees concluded that the investment performance of the Fund was satisfactory. Management Fee and Expenses The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees of its peer group of funds as classified by Morningstar and the expense ratios of a peer group of funds selected on the basis of criteria determined by the independent Trustees for this purpose using data provided by Strategic Insight Mutual Trust Research and Consulting, LLC (Strategic Insight), an independent third party. The Trustees considered that the Fund's management fee for the twelve months ended June 30, 2010 was in the third quintile relative to the management fees paid by other funds in its Morningstar peer group for the comparable period. The Trustees also considered the breakpoints in the management fee schedule and the reduced fee rates above certain asset levels. The Trustees considered that the Fund's expense ratio for the twelve months ended June 30, 2010 was in the second quintile relative to its Strategic Insight peer group for the comparable period. 88 Pioneer Bond Fund | Semiannual Report | 12/31/10 The Trustees also reviewed management fees charged by PIM to its institutional and other clients. In evaluating the fees associated with PIM's client accounts, the Trustees took into account the respective demands, resources and complexity associated with the Fund and client accounts. The Trustees noted that in some instances the fee rates for those clients were lower than the management fee for the Fund and considered that, under the investment advisory agreement with the Fund, PIM performs additional services for the Fund that it does not provide to those other clients or services that are broader in scope, including oversight of the Fund's other service providers and activities related to compliance and the extensive regulatory and tax regimes to which the Fund is subject. The Trustees concluded that the management fee payable by the Fund to PIM was reasonable in relation to the nature and quality of the services provided by PIM. The Trustees also concluded that the Fund's expense ratio was reasonable taking into account the nature and quality of services provided by PIM and the contractual expense limitation agreed to by PIM with respect to the Fund. Profitability The Trustees considered information provided by PIM regarding the profitability of PIM with respect to the advisory services provided by PIM to the Fund, including the methodology used by PIM in allocating certain of its costs to the management of the Fund. The Trustees also considered PIM's profit margin in connection with the overall operation of the Fund. They further reviewed the financial results realized by PIM and its affiliates from non-fund businesses. The Trustees considered PIM's profit margins with respect to the Fund in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees concluded that PIM's profitability with respect to the management of the Fund was not unreasonable. Economies of Scale The Trustees considered PIM's views relating to economies of scale in connection with the Pioneer Funds as fund assets grow and the extent to which any such economies of scale are shared with funds and fund shareholders. The Trustees recognize that economies of scale are difficult to identify and quantify and that, among other factors that may be relevant, are the following: fee levels, expense subsidization, investment by PIM in research and analytical capabilities and PIM's commitment and resource allocation to the Funds. The Trustees noted that profitability also may be an indicator of the availability of any economies of scale, although profitability may vary for other reasons particularly, for example during the recent difficult periods for financial markets, as the level of services was maintained notwithstanding a significant decline in PIM's fee revenues from the Funds. Accordingly, the Trustees concluded that economies of scale, if any, were being appropriately shared with the Fund. Pioneer Bond Fund | Semiannual Report | 12/31/10 89 Other Benefits The Trustees considered the other benefits to PIM from its relationship with the Fund. The Trustees considered the character and amount of fees paid by the Fund, other than under the investment advisory agreement, for services provided by PIM and its affiliates. The Trustees further considered the revenues and profitability of PIM's businesses other than the fund business. The Trustees considered the intangible benefits to PIM by virtue of its relationship with the Fund and the other Pioneer funds. The Trustees concluded that the receipt of these benefits was reasonable in the context of the overall relationship between PIM and the Fund. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including all of the independent Trustees, concluded that the investment advisory agreement between PIM and the Fund, including the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of the investment advisory agreement for the Fund. 90 Pioneer Bond Fund | Semiannual Report | 12/31/10 Trustees, Officers and Service Providers Trustees John F. Cogan, Jr., Chairman David R. Bock Mary K. Bush Benjamin M. Friedman Margaret B.W. Graham Daniel K. Kingsbury Thomas J. Perna Marguerite A. Piret Officers John F. Cogan, Jr., President Daniel K. Kingsbury, Executive Vice President Mark E. Bradley, Treasurer Christopher J. Kelley, Secretary Investment Adviser and Administrator Pioneer Investment Management, Inc. Custodian 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 pioneerinvestments.com. This information is also available on the Securities and Exchange Commission's web site at http://www.sec.gov. The Statement of Additional Information of the Fund includes additional information about the Trustees and is available, without charge, upon request, by calling 1-800-225-6292. Pioneer Bond Fund | Semiannual Report | 12/31/10 91 This page for your notes. 92 Pioneer Bond Fund | Semiannual Report | 12/31/10 How to Contact Pioneer We are pleased to offer a variety of convenient ways for you to contact us for assistance or information. Call us for: - -------------------------------------------------------------------------------- Account Information, including existing accounts, new accounts, prospectuses, applications and service forms 1-800-225-6292 FactFone(SM) for automated fund yields, prices, account information and transactions 1-800-225-4321 Retirement plans information 1-800-622-0176 Write to us: - -------------------------------------------------------------------------------- PIMSS, Inc. P.O. Box 55014 Boston, Massachusetts 02205-5014 Our toll-free fax 1-800-225-4240 Our internet e-mail address ask.pioneer@pioneerinvestments.com (for general questions about Pioneer only) Visit our web site: pioneerinvestments.com This report must be preceded or accompanied by a prospectus. The Fund files a complete schedule of investments with the Securities and Exchange Commission for the first and third quarters for each fiscal year on Form N-Q. Shareholders may view the filed Form N-Q by visiting the Commission's web site at http://www.sec.gov. The filed form may also be viewed and copied at the Commission's Public Reference Room in Washington, DC. Information regarding the operations of the Public Reference Room may be obtained by calling 1-800-SEC-0330. ITEM 2. CODE OF ETHICS. (a) Disclose whether, as of the end of the period covered by the report, the registrant has adopted a code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, regardless of whether these individuals are employed by the registrant or a third party. If the registrant has not adopted such a code of ethics, explain why it has not done so. The registrant has adopted, as of the end of the period covered by this report, a code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer and controller. (b) For purposes of this Item, the term "code of ethics" means written standards that are reasonably designed to deter wrongdoing and to promote: (1) Honest and ethical conduct, including the ethical handling of actual or apparent conflicts of interest between personal and professional relationships; (2) Full, fair, accurate, timely, and understandable disclosure in reports and documents that a registrant files with, or submits to, the Commission and in other public communications made by the registrant; (3) Compliance with applicable governmental laws, rules, and regulations; (4) The prompt internal reporting of violations of the code to an appropriate person or persons identified in the code; and (5) Accountability for adherence to the code. (c) The registrant must briefly describe the nature of any amendment, during the period covered by the report, to a provision of its code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, regardless of whether these individuals are employed by the registrant or a third party, and that relates to any element of the code of ethics definition enumerated in paragraph (b) of this Item. The registrant must file a copy of any such amendment as an exhibit pursuant to Item 10(a), unless the registrant has elected to satisfy paragraph (f) of this Item by posting its code of ethics on its website pursuant to paragraph (f)(2) of this Item, or by undertaking to provide its code of ethics to any person without charge, upon request, pursuant to paragraph (f)(3) of this Item. The registrant has made no amendments to the code of ethics during the period covered by this report. (d) If the registrant has, during the period covered by the report, granted a waiver, including an implicit waiver, from a provision of the code of ethics to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, regardless of whether these individuals are employed by the registrant or a third party, that relates to one or more of the items set forth in paragraph (b) of this Item, the registrant must briefly describe the nature of the waiver, the name of the person to whom the waiver was granted, and the date of the waiver. Not applicable. (e) If the registrant intends to satisfy the disclosure requirement under paragraph (c) or (d) of this Item regarding an amendment to, or a waiver from, a provision of its code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions and that relates to any element of the code of ethics definition enumerated in paragraph (b) of this Item by posting such information on its Internet website, disclose the registrant's Internet address and such intention. Not applicable. (f) The registrant must: (1) File with the Commission, pursuant to Item 10(a), a copy of its code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, as an exhibit to its annual report on this Form N-CSR; (2) Post the text of such code of ethics on its Internet website and disclose, in its most recent report on this Form N-CSR, its Internet address and the fact that it has posted such code of ethics on its Internet website; or (3) Undertake in its most recent report on this Form N-CSR to provide to any person without charge, upon request, a copy of such code of ethics and explain the manner in which such request may be made. 	See Item 10(2) ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT. (a) (1) Disclose that the registrant's board of trustees has determined that the registrant either: (i) Has at least one audit committee financial expert serving on its audit committee; or (ii) Does not have an audit committee financial expert serving on its audit committee. The registrant's Board of Trustees has determined that the registrant has at least one audit committee financial expert. (2) If the registrant provides the disclosure required by paragraph (a)(1)(i) of this Item, it must disclose the name of the audit committee financial expert and whether that person is "independent." In order to be considered "independent" for purposes of this Item, a member of an audit committee may not, other than in his or her capacity as a member of the audit committee, the board of trustees, or any other board committee: (i) Accept directly or indirectly any consulting, advisory, or other compensatory fee from the issuer; or (ii) Be an "interested person" of the investment company as defined in Section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19)). Ms. Marguerite A. Piret, an independent trustee, is such an audit committee financial expert. (3) If the registrant provides the disclosure required by paragraph (a)(1) (ii) of this Item, it must explain why it does not have an audit committee financial expert. Not applicable. ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES. (a) Disclose, under the caption AUDIT FEES, the aggregate fees billed for each of the last two fiscal years for professional services rendered by the principal accountant for the audit of the registrant's annual financial statements or services that are normally provided by the accountant in connection with statutory and regulatory filings or engagements for those fiscal years. 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 Bond Fund By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr, President Date March 1, 2011 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr., President Date March 1, 2011 By (Signature and Title)* /s/ Mark Bradley Mark Bradley, Treasurer Date March 1, 2011 * Print the name and title of each signing officer under his or her signature.