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, 2011 through December 31, 2011 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, 2011 -------------------------------------------------------------------------------- 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: us.pioneerinvestments.com Table of Contents Letter to Shareowners 2 Portfolio Management Discussion 4 Portfolio Summary 9 Prices and Distributions 10 Performance Update 11 Comparing Ongoing Fund Expenses 17 Schedule of Investments 19 Financial Statements 54 Notes to Financial Statements 64 Approval of Investment Advisory Agreement 73 Trustees, Officers and Service Providers 77 Pioneer Bond Fund | Semiannual Report | 12/31/11 1 President's Letter Dear Shareowner, Last year was difficult for investors, although bond investors experienced a much smoother ride than equity investors. The year was characterized by higher-than-usual volatility in the equity markets triggered by a series of major events, including the nuclear disaster in Japan, the European financial crisis, and political gridlock in Washington D.C. The Standard & Poor's 500 Index dropped 21% from its May high to its October low, only to finish the year virtually flat. The Barclays Capital Aggregate Bond Index, by contrast, was up 7.8% for the year. As we ended 2011, some positive trends were developing in the U.S. economy. Consumption, the most important driver of economic growth, rose 2.3% in the fourth quarter, up nicely from 0.7% in the second and third quarters. Year- over-year retail sales grew 4% over the last six months of 2011, and auto sales reached their highest level of the year. There were improvements in broad economic data, including employment and rising consumer confidence. Initial jobless claims trended in the right direction, with the final weekly report of 2011 falling to a three-and-a-half year low. While we expect moderate economic growth in the U.S. in 2012, there are still reasons for investors to remain cautious. The central issue remains Europe, which faces weak or possibly declining economic growth. The greatest risk to our outlook for 2012 is the possible contagion effects of the European sovereign-debt and banking crises. The European Union must find a comprehensive solution that includes ensuring funding for troubled sovereigns, achieving workable fiscal and economic integration, and improving labor competitiveness in southern Europe. Further setbacks in Europe could lead to further market volatility, while tangible progress could help the equity markets make up last year's lackluster results. Pioneer's investment professionals focus on finding good opportunities to invest in both equity and bond markets using the same disciplined investment approach we have used since 1928. Our strategy is to identify undervalued individual securities with the greatest potential for success, carefully weighing risk against reward. Our teams of investment professionals continually monitor and analyze the relative valuations of different sectors and securities 2 Pioneer Bond Fund | Semiannual Report | 12/31/11 globally to help build portfolios that we believe can help you achieve your investment goals. At Pioneer, we have long advocated the benefits of staying diversified* and investing for the long term. The strategy has generally performed well for many investors. Our advice, as always, is to work closely with a trusted financial advisor to discuss your goals and work together to develop an investment strategy that meets your individual needs. There is no single best strategy that works for every investor. We invite you to learn more about Pioneer and our time-tested approach to investing by consulting with your financial advisor or visiting us online at us.pioneerinvestments.com. We greatly appreciate your trust in us and we thank you for investing with Pioneer. * Diversification does not assure a profit or protect against loss in a declining market. Sincerely, /s/Daniel K. Kingsbury Daniel K. Kingsbury President and CEO Pioneer Investment Management USA, Inc. Any information in this shareowner report regarding market or economic trends or the factors influencing the Fund's historical or future performance are statements of opinion as of the date of this report. These statements should not be relied upon for any other purposes. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. Pioneer Bond Fund | Semiannual Report | 12/31/11 3 Portfolio Management Discussion | 12/31/11 Credit-exposed bonds fell out of favor while Treasuries and other high-grade bonds rallied during the six months ended December 31, 2011. The period saw continued declines in interest rates and rising high-grade bond prices during a market flight to safety, as investors became increasingly unsettled by a confluence of factors that muddied the economic outlook. In the following discussion, Kenneth J. Taubes reviews the factors that affected the performance of Pioneer Bond Fund during the six months ended December 31, 2011. Mr. Taubes, Chief Investment Officer, U.S., and portfolio manager at Pioneer Investments, is responsible for the daily management of the Fund. Q How did the Fund perform during the six months ended December 31, 2011? A Pioneer Bond Fund Class A shares returned 1.59% at net asset value during the six months ended December 31, 2011, while the Fund's benchmark, the Barclays Capital Aggregate Bond Index (the Barclays Index), returned 4.98%. During the same six-month period, the average return of the 120 mutual funds in Lipper's Corporate Debt, A-Rated Funds category was 3.80%. On December 31, 2011, the 30-day SEC yield of the Fund's Class A shares was 4.48% with fees waived, and 4.32% without fees waived. Q How would you describe the investment environment for fixed-income securities during the six-months ended December 31, 2011? A The dominant trend in fixed-income markets during the six-month period was a decline in interest rates, as investors bid-up the prices of Treasuries and other better-quality investments amid a host of domestic and global issues that the market feared could threaten the economic recovery. The issues worrying investors during the six-month period included: the March earthquake and resulting tsunami in Japan, which, even though it occurred prior to the start of the six-month period, still put a crimp in the global industrial supply chain for several months afterwards; the protracted and highly partisan debate last summer in Washington, D.C., over the national debt ceiling, which contributed to doubts about the resolve of national leaders to solve difficult economic problems; the resulting downgrade by Standard & Poor's of the credit rating of U.S. Treasury securities in August; concerns about the debt quality of sovereign bonds issued by Greece, Italy and other European nations and the vulnerability of European banks that owned those governments' debt; and huge tidal flooding that crippled industrial production in Thailand and other nations. Against that backdrop, a general market flight to quality led to strong performance by Treasuries 4 Pioneer Bond Fund | Semiannual Report | 12/31/11 and other high-grade bonds, while corporate bonds and other credit-sensitive securities struggled. High-yield corporates, in particular, tended to fall in price. Q What were the principal factors that affected the Fund's performance during the six months ended December 31, 2011? A The Fund underperformed the Barclays Index during the six-month period for two basic reasons. First, the Fund's asset allocation -- especially the significant underweighting of Treasuries -- was not positioned for the prevailing market environment. Second, the shorter-duration benchmark profile meant that the Fund would not benefit as much from the decline in interest rates. Throughout the six months, we underweighted Treasuries and emphasized credit-sensitive securities in the Fund, believing that the global economy -- and the U.S. economy -- would withstand short-term pressures and continue to expand. Treasuries have become very expensive in our view, given their negative real yields, or the amount of yield offered when adjusted for inflation. In fact, as of December 31, 2011, no Treasury security was offering a yield that exceeded the rate of inflation, as measured by the Consumer Price Index. We maintained healthy Fund allocations to both high-yield and investment- grade corporate bonds, as well as to bank loans. It was our position -- and it still is -- that corporations have generally solid financial structures and have shown their ability to improve earnings, even in a slow-growth atmosphere. As a consequence, we believed corporations in general were likely to continue to meet their debt obligations. As noted above, we also maintained a shorter duration in the Fund than that of the Barclays Index during the six-month period. (Duration measures a portfolio's price sensitivity to changes in interest rates.) The shorter- duration stance was partly the result of the Fund's significant underweight to Treasuries. When interest rates fell during the period, the Fund did not benefit as strongly from the resulting rise in prices of Treasuries and other high-grade bonds because of the shorter duration. The negative effect of duration positioning was softened, however, by positioning on the yield curve, as the Fund tended to have greater exposure to intermediate- and longer-term bonds than to short-term securities. During the six-month period ended December 31, 2011, yields on all maturities fell, with the greatest declines occurring in longer-term securities. That resulted in a flattening of the yield curve and in outperformance by longer-term bonds that gained in price. During the six months, the yield of the five-year Treasuries declined by 93 basis points (or 0.93%), while the yields of 10-year and 30-year Treasuries dropped by 128 basis points (1.28%) and 148 basis points (1.48%), respectively. Pioneer Bond Fund | Semiannual Report | 12/31/11 5 As of December 31, 2011, the Fund's effective duration was 4.12 years. High-yield securities represented roughly 17% of the Fund's net assets, with another 27% of net assets invested in BBB-rated debt (the lowest-rated rung on the investment-grade ladder). Investments in Treasuries and government agency debt totaled just over 8% of the Fund's net assets at the end of the period. Q How did security selection affect the Fund's performance during the six months ended December 31, 2011? A Security selection was a positive for the Fund's performance during the six- month period, helping to mitigate the effects of the Fund's sector positioning. While financials sector bonds generally struggled, the Fund's selections within the group performed well, with notable contributors to relative results including the preferred shares of Wells Fargo and the bonds of PNC Bank. Bonds of Commercial Metals, a metals recycler and fabricator, also performed well for the Fund. On the negative side, the bonds of investment banker Goldman Sachs underperformed when concerns grew about threats to the company's profitability, while worries about a potential global slowdown undercut the performance of the Fund's holdings in Cemex, a Mexico-based concrete conglomerate. A Fund investment in the debt of Forest City, a real estate investment firm, also hurt relative results. Q Did investing in derivatives affect the Fund's performance during the six months ended December 31, 2011? A The only derivatives in which we invested the Fund during the period were some interest-rate futures contracts. We held the short-term Treasury contracts to help manage the Fund's exposure to interest rate changes. The contracts had a modest, positive impact on the Fund's relative performance during the period, as the yield curve flattened and longer-term rates declined more than short-term rates. Q What is your investment outlook? A We think the U.S. economy will expand -- albeit modestly -- as business activity continues its slow, but important, growth trajectory. Industrial production has increased, as has consumer spending, with auto sales showing considerable gains. Export activity has increased, and we may have seen a bottoming in the housing market, most notably in multi-family housing. We are feeling the end of the effects of cutbacks by local and state governments, made in large part by the loss of federal stimulus money. The cutbacks have been one of the primary sources of weakness in the domestic economy this past year. Moreover, state tax receipts have increased, suggesting an improvement in the economy. 6 Pioneer Bond Fund | Semiannual Report | 12/31/11 As 2011 ended, we believed the best fixed-income opportunities continued to lie in corporate bonds and other credit-sensitive securities, with the possible exception of non-agency mortgage-backed securities. Corporates were selling at very attractive valuations and their yield advantages over other fixed-income classes could help them outperform. In contrast, Treasuries appeared very expensive, although, as the Fed has indicated, we are not likely to see increasing short-term interest rates, which could undermine Treasury prices. The Fund remains overweight in corporate bonds, with emphasis on financials and industrials. We also expect to maintain a solid Fund exposure to floating-rate bank loans, which accounted for roughly 7.50% of net assets on December 31, 2011. Although we think it is unlikely that short-term interest rates will rise and increase the yields of the bank loans, many are selling at below-par (face value) prices, and so they offer the potential for capital appreciation. In addition, we like the fact that bank loans have a senior position in corporate capital structures, meaning that they are more likely to be paid in the event a company fails to meet all its debt obligations. Please refer to the Schedule of Investments on pages 19-53 for a full listing of Fund securities. Pioneer Bond Fund | Semiannual Report | 12/31/11 7 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. These risks may increase share price volatility. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. Any information in this shareholder report regarding market or economic trends or the factors influencing the Fund's historical or future performance are statements of opinion as of the date of this report. These opinions should not be relied upon for any other purposes. 8 Pioneer Bond Fund | Semiannual Report | 12/31/11 Portfolio Summary | 12/31/11 Portfolio Diversification -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [THE FOLLOWING DATA IS A REPRESENTATION OF A PIE CHART IN THE PRINTED MATERIAL] U.S. Corporate Bonds 34.5% U.S. Government Securities 23.1% Collateralized Mortgage Obligations 15.6% Senior Secured Loans 7.4% Asset Backed Securities 6.4% Municipal Bonds 6.2% Temporary Cash Investments 4.6% Preferred Stocks 1.5% Convertible Corporate Bonds 0.6% Foreign Government Bonds 0.1% Portfolio Quality -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [THE FOLLOWING DATA IS A REPRESENTATION OF A PIE CHART IN THE PRINTED MATERIAL] AAA 37.8% AA 5.0% A 11.2% BBB 27.0% BB 10.0% B 4.5% CCC 1.3% Not Rated 1.3% Commercial Paper 1.9% Bond ratings are ordered highest to lowest in portfolio. Based on Standard & Poor's measures, AAA (highest possible rating) through BBB are considered investment grade; BB or lower ratings are considered non-investment grade. Cash equivalents and some bonds may not be rated. 10 Largest Holdings -------------------------------------------------------------------------------- (As a percentage of total long-term holdings)* 1. U.S. Treasury Bonds, 4.5%, 8/15/39 0.93% 2. U.S. Treasury Bonds, 4.5%, 5/15/38 0.86 3. U.S. Treasury Bonds, 4.25%, 5/15/39 0.75 4. U.S. Treasury Notes, 4.5%, 2/15/36 0.75 5. U.S. Treasury Bonds, 2.75%, 2/15/19 0.74 6. State Street Capital, 8.25%, 1/29/49 0.72 7. U.S. Treasury Notes, 2.125%, 8/15/21 0.64 8. Massachusetts Health & Educational Facilities Authority, 5.5%, 11/15/36 0.58 9. U.S. Treasury Bonds, 3.125%, 5/15/19 0.56 10. U.S. Treasury Bonds, 4.375%, 2/15/38 0.55 * 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. Pioneer Bond Fund | Semiannual Report | 12/31/11 9 Prices and Distributions | 12/31/11 Net Asset Value per Share -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 12/31/11 6/30/11 -------------------------------------------------------------------------------- A $ 9.53 $ 9.66 -------------------------------------------------------------------------------- B $ 9.48 $ 9.60 -------------------------------------------------------------------------------- C $ 9.43 $ 9.55 -------------------------------------------------------------------------------- R $ 9.62 $ 9.74 -------------------------------------------------------------------------------- Y $ 9.45 $ 9.57 -------------------------------------------------------------------------------- Z $ 9.55 $ 9.68 -------------------------------------------------------------------------------- Distributions per Share: 7/1/11-12/31/11 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains -------------------------------------------------------------------------------- A $ 0.2319 $ -- $ 0.0499 -------------------------------------------------------------------------------- B $ 0.1803 $ -- $ 0.0499 -------------------------------------------------------------------------------- C $ 0.1882 $ -- $ 0.0499 -------------------------------------------------------------------------------- R $ 0.2139 $ -- $ 0.0499 -------------------------------------------------------------------------------- Y $ 0.2419 $ -- $ 0.0499 -------------------------------------------------------------------------------- Z $ 0.2419 $ -- $ 0.0499 -------------------------------------------------------------------------------- Index Definition -------------------------------------------------------------------------------- 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 11-16. 10 Pioneer Bond Fund | Semiannual Report | 12/31/11 Performance Update | 12/31/11 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, 2011) -------------------------------------------------------------------------------- Net Asset Public Offering Period Value (NAV) Price (POP) -------------------------------------------------------------------------------- 10 Years 6.19% 5.71% 5 Years 6.55 5.57 1 Year 5.08 0.35 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated November 1, 2011) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 1.06% 0.85% -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS A REPRESENTATION OF A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Barclays Capital Aggregate Bond Fund Bond Index 12/01 $9,550 $10,000 12/02 $10,393 $11,025 12/03 $11,313 $11,478 12/04 $11,959 $11,976 12/05 $12,253 $12,267 12/06 $12,688 $12,798 12/07 $13,461 $13,690 12/08 $12,874 $14,407 12/09 $15,153 $15,262 12/10 $16,583 $16,260 12/11 $17,426 $17,535 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. NAV results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. POP returns reflect deduction of maximum 4.50% sales charge. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. 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. Pioneer Bond Fund | Semiannual Report | 12/31/11 11 Performance Update | 12/31/11 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, 2011) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 5.20% 5.20% 5 Years 5.51 5.51 1 Year 4.10 0.10 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated November 1, 2011) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 1.95% 1.90% -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS A REPRESENTATION OF A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Barclays Capital Aggregate Bond Fund Bond Index 12/01 $10,000 $10,000 12/02 $10,779 $11,025 12/03 $11,635 $11,478 12/04 $12,197 $11,976 12/05 $12,372 $12,267 12/06 $12,697 $12,798 12/07 $13,351 $13,690 12/08 $12,643 $14,407 12/09 $14,740 $15,262 12/10 $15,952 $16,260 12/11 $16,606 $17,535 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. "If Redeemed" returns reflect the deduction of applicable contingent deferred sales charge (CDSC). 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 us.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, 2013, for Class B shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. 12 Pioneer Bond Fund | Semiannual Report | 12/31/11 Performance Update | 12/31/11 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, 2011) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 5.24% 5.24% 5 Years 5.62 5.62 1 Year 4.18 4.18 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated November 1, 2011) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 1.73% 1.73% -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS A REPRESENTATION OF A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Barclays Capital Aggregate Bond Fund Bond Index 12/01 $10,000 $10,000 12/02 $10,768 $11,025 12/03 $11,604 $11,478 12/04 $12,175 $11,976 12/05 $12,356 $12,267 12/06 $12,673 $12,798 12/07 $13,347 $13,690 12/08 $12,648 $14,407 12/09 $14,752 $15,262 12/10 $15,991 $16,260 12/11 $16,659 $17,535 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Class C shares held for less than one year are also subject to a 1% contingent deferred sales charge (CDSC). 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 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 | 12/31/11 13 Performance Update | 12/31/11 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, 2011) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 5.89% 5.89% 5 Years 6.19 6.19 1 Year 4.69 4.69 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated November 1, 2011) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 1.24% 1.24% -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS A REPRESENTATION OF A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Barclays Capital Aggregate Bond Fund Bond Index 12/01 $10,000 $10,000 12/02 $10,823 $11,025 12/03 $11,779 $11,478 12/04 $12,441 $11,976 12/05 $12,703 $12,267 12/06 $13,123 $12,798 12/07 $13,906 $13,690 12/08 $13,229 $14,407 12/09 $15,519 $15,262 12/10 $16,928 $16,260 12/11 $17,722 $17,535 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. 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 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 | 12/31/11 Performance Update | 12/31/11 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, 2011) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 6.57% 6.57% 5 Years 6.86 6.86 1 Year 5.34 5.34 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated November 1, 2011) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 0.61% 0.61% -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS A REPRESENTATION OF A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $5 Million Investment Pioneer Barclays Capital Aggregate Bond Fund Bond Index 12/01 $5,000,000 $5,000,000 12/02 $5,459,018 $5,512,747 12/03 $5,967,251 $5,739,000 12/04 $6,346,053 $5,987,992 12/05 $6,522,154 $6,133,444 12/06 $6,782,079 $6,399,230 12/07 $7,222,236 $6,845,047 12/08 $6,929,312 $7,203,722 12/09 $8,173,276 $7,630,962 12/10 $8,970,443 $8,130,134 12/11 $9,449,474 $8,767,676 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. 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 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 | 12/31/11 15 Performance Update | 12/31/11 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, 2011) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 6.23% 6.23% 5 Years 6.73 6.73 1 Year 5.28 5.28 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated November 1, 2011) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 0.72% 0.65% -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS A REPRESENTATION OF A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Barclays Capital Aggregate Bond Fund Bond Index 12/01 $10,000 $10,000 12/02 $10,877 $11,025 12/03 $11,840 $11,478 12/04 $12,516 $11,976 12/05 $12,824 $12,267 12/06 $13,213 $12,798 12/07 $13,981 $13,690 12/08 $13,406 $14,407 12/09 $15,867 $15,262 12/10 $17,384 $16,260 12/11 $18,303 $17,535 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. 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. 16 Pioneer Bond Fund | Semiannual Report | 12/31/11 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, 2011 through December 31, 2011. -------------------------------------------------------------------------------------------------------- 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 7/1/11 -------------------------------------------------------------------------------------------------------- Ending Account Value $ 1,015.90 $ 1,011.60 $ 1,012.50 $ 1,014.90 $ 1,018.10 $ 1,016.90 (after expenses) on 12/31/11 -------------------------------------------------------------------------------------------------------- Expenses Paid $ 4.31 $ 9.61 $ 8.75 $ 6.33 $ 3.25 $ 3.30 During Period* -------------------------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 0.85%, 1.90%, 1.73%, 1.25%, 0.64%, 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 184/366 (to reflect the one-half year period). Pioneer Bond Fund | Semiannual Report | 12/31/11 17 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, 2011 through December 31, 2011. -------------------------------------------------------------------------------------------------------- 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 7/1/11 -------------------------------------------------------------------------------------------------------- Ending Account Value $ 1,020.86 $ 1,015.58 $ 1,016.44 $ 1,018.85 $ 1,021.92 $ 1,021.87 (after expenses) on 12/31/11 -------------------------------------------------------------------------------------------------------- Expenses Paid $ 4.32 $ 9.63 $ 8.77 $ 6.34 $ 3.25 $ 3.30 During Period* -------------------------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 0.85%, 1.90%, 1.73%, 1.25%, 0.64%, 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 184/366 (to reflect the one-half year period). 18 Pioneer Bond Fund | Semiannual Report | 12/31/11 Schedule of Investments | 12/31/11 (unaudited) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) 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 $ 2,475,650 -------------- Total Energy $ 2,475,650 ----------------------------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 0.0% Health Care Services -- 0.0% 766,000 B+/B2 Omnicare, Inc., 3.25%, 12/15/35 $ 702,805 -------------- Total Health Care Equipment & Services $ 702,805 ----------------------------------------------------------------------------------------------------------- SEMICONDUCTORS -- 0.4% Semiconductors -- 0.4% 4,725,000 A-/NR Intel Corp., 2.95%, 12/15/35 $ 4,919,906 -------------- Total Semiconductors $ 4,919,906 ----------------------------------------------------------------------------------------------------------- TOTAL CONVERTIBLE CORPORATE BONDS (Cost $7,291,520) $ 8,098,361 ----------------------------------------------------------------------------------------------------------- Shares ----------------------------------------------------------------------------------------------------------- PREFERRED STOCKS -- 1.5% BANKS -- 0.5% Diversified Banks -- 0.5% 5,610 Wells Fargo & Co., 7.5%, 12/31/49 $ 5,924,160 -------------- Total Banks $ 5,924,160 ----------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 0.2% Diversified Financial Services -- 0.2% 116,000 Citigroup Capital XIII, 7.875%, 10/30/40 $ 3,022,960 -------------- Total Diversified Financials $ 3,022,960 ----------------------------------------------------------------------------------------------------------- INSURANCE -- 0.3% Life & Health Insurance -- 0.3% 153,800 Delphi Financial Group, 7.376%, 5/15/37 $ 3,709,656 -------------- Total Insurance $ 3,709,656 ----------------------------------------------------------------------------------------------------------- REAL ESTATE -- 0.5% Real Estate Operating Companies -- 0.5% 150,400 Forest City Enterprises, Inc., 7.0%, 12/31/49 $ 6,946,600 -------------- Total Real Estate $ 6,946,600 ----------------------------------------------------------------------------------------------------------- TOTAL PREFERRED STOCK (Cost $20,918,099) $ 19,603,376 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 19 Schedule of Investments | 12/31/11 (unaudited) (continued) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- ASSET BACKED SECURITIES -- 6.5% COMMERCIAL SERVICES & SUPPLIES -- 0.1% Research & Consulting Services -- 0.1% 753,333 A/NR TAL Advantage LLC, 4.31%, 5/20/26 $ 734,968 -------------- Total Commercial Services & Supplies $ 734,968 ----------------------------------------------------------------------------------------------------------- AUTOMOBILES & COMPONENTS -- 0.4% Automobile Manufacturers -- 0.4% 650,000 BBB/Aa2 AMCAR, 4.2%, 11/8/16 $ 651,637 500,000 BBB/Baa1 AmeriCredit Automobile Receivables Trust, 4.04%, 7/10/17 496,713 528,440 A/NR Santander Drive Auto Receivables Trust, 1.89%, 5/15/13 521,980 1,350,000 NR/Aa1 Santander Drive Auto Receivables Trust, 2.44%, 1/15/16 1,350,260 2,144,822 BBB/NR Santander Drive Auto Receivables Trust, 3.35%, 6/15/17 2,112,650 -------------- $ 5,133,240 -------------- Total Automobiles & Components $ 5,133,240 ----------------------------------------------------------------------------------------------------------- BANKS -- 2.7% Diversified Banks -- 0.1% 1,180,739 0.38 AAA/Aa1 Wells Fargo Home Equity, Floating Rate Note, 4/25/37 $ 1,141,176 ----------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- 2.6% 1,018,692 AAA/Aaa 321 Henderson Receivables, Inc., 3.82%, 12/15/48 $ 1,003,378 428,800 AAA/Aaa Accredited Mortgage Loan Trust, 0.8015%, 10/25/34 371,036 1,503,946 BBB+/A2 ACE Securities Corp., 6.5%, 8/15/30 1,545,985 1,622,821 NR/A1 Bombardier Capital Mortgage Securitization Corp., 6.65%, 4/15/28 1,698,070 269,252 0.34 BBB+/Ba1 Carrington Mortgage Loan Trust, Floating Rate Note, 1/25/37 266,674 310,276 0.78 AA/Aa1 Carrington Mortgage Loan Trust, Floating Rate Note, 2/25/35 303,243 312,247 0.69 AAA/Baa3 Carrington Mortgage Loan Trust, Floating Rate Note, 9/25/35 291,155 592,116 AAA/B2 Citicorp Residential Mortgage Securities, Inc., 5.775%, 9/25/36 574,568 1,700,000 A/B2 Citicorp Residential Mortgage Securities, Inc., 5.892%, 3/25/37 1,552,105 2,791,000 5.94 A/B1 Citicorp Residential Mortgage Securities, Inc., Floating Rate Note, 7/25/36 2,642,876 388,554 BBB/Baa3 Citigroup Mortgage Loan Trust, 0.34606%, 1/25/37 379,052 The accompanying notes are an integral part of these financial statements. 20 Pioneer Bond Fund | Semiannual Report | 12/31/11 ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 786,941 0.70 AA+/Aa1 Citigroup Mortgage Loan Trust, Floating Rate Note, 7/25/35 $ 767,924 2,363,773 5.07 AAA/B2 Countrywide Asset-Backed Certificates, Floating Rate Note, 12/25/35 2,131,991 502,441 0.71 AA+/Aa1 Countrywide Asset-Backed Certificates, Floating Rate Note, 8/25/35 496,503 2,098,773 BBB/Baa3 Countrywide Home Equity Loan Trust, 0.5371%, 11/15/28 1,994,552 700,000 6.25 AA/B1 Credit-Based Asset Servicing, Floating Rate Note, 10/25/36 673,693 1,445,288 0.69 AA+/Aa2 Credit-Based Asset Servicing, Floating Rate Note, 5/25/50 1,360,875 464,589 0.83 AAA/Aaa First Franklin Mortgage Loan Asset-Backed Certificates, Floating Rate Note, 9/24/34 438,201 4,700,000 AAA/Aa2 First NLC Trust, 0.74719%, 9/25/35 4,394,180 179,462 0.40 A/A2 Fremont Home Loan Trust, Floating Rate Note, 2/25/36 178,155 505,276 0.94 A/A2 GSAMP Trust, Floating Rate Note, 3/25/35 476,803 114,051 0.66 AAA/Aaa GSAMP Trust, Floating Rate Note, 8/25/36 112,704 532,026 0.67 AAA/Aa1 GSAMP Trust, Floating Rate Note, 9/25/35 518,043 1,200,000 AA/NR Leaf II Receivables, 4.9%, 3/20/13 1,192,320 498,991 BBB+/A2 Lehman ABS Manufactured Housing Contract Trust, 5.873%, 5/15/22 530,168 4,908,672 CCC+/Caa3 Local Insight Media Finance LLC, 5.88%, 10/23/37 1,963,469 2,200,000 BBB+/Ba3 Madison Avenue Manufactured Housing, 2.4626%, 3/25/32 1,942,875 895,521 A/NR Mid-State Trust, 5.25%, 12/15/45 938,332 415,812 0.35 B/Ba3 Morgan Stanley ABS Capital, Inc., Floating Rate Note, 12/25/36 216,628 543,020 0.39 CCC/Caa3 Morgan Stanley Home Equity Loan, Floating Rate Note, 4/25/37 458,706 30,885 A-/Caa2 Morgan Stanley IXIS Real Estate, 1.445%, 11/25/36 8,029 1,140,590 0.55 AAA/Aa3 Option One Mortgage Loan Trust, Floating Rate Note, 11/25/35 1,041,717 350,937 0.41 BBB/Aa3 Option One Mortgage Loan Trust, Floating Rate Note, 2/25/38 343,415 875,122 5.91 AA/Aa2 Origen Manufactured Housing, Floating Rate Note, 1/15/35 949,032 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 21 Schedule of Investments | 12/31/11 (unaudited) (continued) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 1,500,000 0.67 AA+/A3 RASC 2005-KS7 M1, Floating Rate Note, 8/25/35 $ 1,426,095 -------------- $ 35,182,552 -------------- Total Banks $ 36,323,728 ----------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 1.8% Consumer Finance -- 0.1% 900,000 0.63 AAA/Aaa SLMA 2004-10 A6B, Floating Rate Note, 4/27/26 $ 859,590 ----------------------------------------------------------------------------------------------------------- Diversified Financial Services -- 0.7% 221,688 0.73 AA/Aa2 Asset Backed Securities Corp., Floating Rate Note, 4/25/35 $ 215,712 1,700,000 A/NR DT Auto Owner Trust, 3.46%, 1/15/14 1,703,736 1,400,000 BBB/NR DT Auto Owner Trust, 4.89%, 1/17/17 1,411,071 473,494 AA/NR DT Auto Owner Trust, 5.92%, 10/15/15 483,838 1,952,810 AAA/Aaa Home Equity Asset Trust, 0.75719%, 11/25/35 1,906,593 335,213 0.53 AAA/A1 JPMorgan Mortgage Acquisition, Floating Rate Note, 12/25/35 308,179 3,300,000 0.78 AA-/A3 Long Beach Mortgage Loan Trust, Floating Rate Note, 4/25/35 2,958,001 800,000 A/NR Prestige Auto Receivables Trust, 3.9%, 7/16/18 812,904 -------------- $ 9,800,034 ----------------------------------------------------------------------------------------------------------- Specialized Finance -- 1.0% 2,588,657 0.56 AA/Baa3 Aegis Asset Backed Securities, Floating Rate Note, 3/25/12 $ 2,233,889 2,895,000 BBB-/Baa3 Dominos Pizza Master Issuer LLC, 5.261%, 4/25/37 2,906,580 5,325,000 BB/Aaa Dominos Pizza Master Issuer LLC, 7.629%, 4/25/37 5,364,104 800,000 0.99 A/A2 Irwin Home Equity Co., Floating Rate Note, 4/25/30 633,413 2,006,233 5.32 NR/Baa1 Irwin Home Equity Corp., Floating Rate Note, 6/25/35 1,896,191 228,752 AA+/Aa1 Master Asset Backed Securities Trust, 0.67375%, 5/25/35 222,856 908,073 0.64 AAA/Aaa New Century Home Equity Loan, Floating Rate Note, 3/25/35 798,253 -------------- $ 14,055,286 -------------- Total Diversified Financials $ 24,714,910 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 22 Pioneer Bond Fund | Semiannual Report | 12/31/11 ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- REAL ESTATE -- 0.8% Mortgage Real Estate Investment Trusts -- 0.8% 5,000,000 A+/NR FREMF Mortgage Trust, 4.437%, 11/25/17 $ 4,528,653 1,500,000 NR/NR FREMF Mortgage Trust, 4.598%, 11/25/49 1,296,777 1,750,000 NR/A3 FREMF Mortgage Trust, 4.77055%, 4/25/44 1,617,754 800,000 A-/A3 FREMF Mortgage Trust, 4.8868%, 7/25/44 740,649 890,000 NR/NR FREMF Mortgage Trust, 5.163344%, 9/25/45 805,831 600,000 A+/NR FREMF Mortgage Trust, 5.237%, 9/25/43 547,387 850,000 A+/A3 FREMF Mortgage Trust, 5.434669%, 4/25/20 789,416 -------------- $ 10,326,467 -------------- Total Real Estate $ 10,326,467 ----------------------------------------------------------------------------------------------------------- GOVERNMENT -- 0.7% Government -- 0.7% 965 AAA/Aaa Federal Home Loan Bank, 6.0%, 4/15/32 $ 964 3,743,000 AAA/Aaa FHR 3211 PB, 5.5%, 2/15/33 3,879,052 5,000,000 NR/NR Freddie Mac Remic, 5.0%, 6/15/33 5,305,723 503,162 AAA/Aaa Freddie Mac, 5.0%, 8/15/35 515,912 -------------- $ 9,701,651 -------------- Total Government $ 9,701,651 ----------------------------------------------------------------------------------------------------------- TOTAL ASSET BACKED SECURITIES (Cost $90,259,557) $ 86,934,964 ----------------------------------------------------------------------------------------------------------- COLLATERALIZED MORTGAGE OBLIGATIONS -- 15.8% BANKS -- 11.8% Thrifts & Mortgage Finance -- 11.8% 2,553,545 NR/Ba2 Banc of America Alternative Loan Trust, 5.0%, 7/25/19 $ 2,584,939 1,545,056 NR/B2 Banc of America Alternative Loan Trust, 5.25%, 5/25/19 1,565,531 1,801,971 NR/Ba3 Banc of America Alternative Loan Trust, 5.5%, 1/25/20 1,813,078 1,672,799 NR/B1 Banc of America Alternative Loan Trust, 5.5%, 11/25/19 1,689,139 2,464,712 NR/Baa2 Banc of America Alternative Loan Trust, 5.5%, 9/25/33 2,536,546 1,255,093 AAA/Aa3 Banc of America Alternative Loan Trust, 5.75%, 4/25/33 1,313,846 2,289,020 NR/Baa3 Banc of America Alternative Loan Trust, 6.0%, 3/25/34 2,345,982 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 23 Schedule of Investments | 12/31/11 (unaudited) (continued) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 2,082,817 BB-/A Banc of America Funding Corp., 0.4013%, 9/25/36 $ 1,971,178 1,947,161 B-/NR Banc of America Funding Corp., 5.5%, 1/25/36 1,901,099 1,395,561 AAA/Aaa Bayview Commercial Asset Trust, 0.67375%, 4/25/34 1,083,448 14,260,057 AAA/A1 Bayview Commercial Asset Trust, 2.65868%, 7/25/37 1,088,042 9,451,694 AA/A3 Bayview Commercial Asset Trust, 2.83149%, 9/25/37 875,227 2,004,790 2.45 AAA/Baa2 Bear Stearns Adjustable Rate Mortgage Trust, Floating Rate Note, 8/25/33 1,754,668 641,475 AAA/A3 Chase Mortgage Finance Corp., 5.0%, 10/25/33 660,643 784,828 AAA/Aaa Commercial Mortgage Pass Through Certificates, 0.48705%, 11/15/17 742,188 1,710,660 AAA/Aaa Commercial Mortgage Pass Through Certificates, 0.538%, 11/15/17 1,583,505 150,000 NR/Baa3 Commercial Mortgage Pass Through Certificates, 5.949%, 8/9/16 149,870 804,599 AAA/Ba1 Countrywide Alternative Loan Trust, 4.25%, 4/25/34 784,155 1,364,698 AAA/B2 Countrywide Alternative Loan Trust, 4.75%, 10/25/33 1,371,989 1,659,235 AAA/Ba1 Countrywide Alternative Loan Trust, 5.125%, 3/25/34 1,686,335 1,339,103 BB/B2 Countrywide Alternative Loan Trust, 5.5%, 1/25/35 1,355,307 6,521,939 CCC/NR Countrywide Alternative Loan Trust, 5.5%, 4/25/35 2,850,759 1,874,428 AAA/NR Countrywide Alternative Loan Trust, 5.5%, 8/25/34 1,758,570 2,104,385 AAA/NR Countrywide Alternative Loan Trust, 5.75%, 12/25/33 2,167,729 1,538,654 0.74 B-/NR Countrywide Alternative Loan Trust, Floating Rate Note, 8/25/18 1,458,106 1,759,737 CC/Ba1 Countrywide Home Loan Mortgage Pass Through Trust, 4.5%, 9/25/35 1,405,222 1,954,215 AAA/Baa3 Countrywide Home Loan Mortgage Pass Through Trust, 4.867257%, 12/25/33 1,748,295 560,151 BB+/NR Countrywide Home Loan Mortgage Pass Through Trust, 5.25%, 1/25/35 559,313 520,179 AAA/Aa3 Downey Savings & Loan, 0.83625%, 7/19/44 350,139 1,250,000 A/A2 Extended Stay America Trust, 4.8603%, 11/5/27 1,265,506 The accompanying notes are an integral part of these financial statements. 24 Pioneer Bond Fund | Semiannual Report | 12/31/11 ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 526,676 NR/Baa1 First Horizon Asset Securities, Inc., 5.6329%, 10/25/34 $ 519,345 819,199 CCC/NR First Horizon Asset Securities, Inc., 6.0%, 5/25/36 751,805 3,375,000 AAA/Aaa GMAC Commercial Mortgage Securities, Inc., 4.864%, 12/10/41 3,613,208 800,000 A/A2 GMAC Commercial Mortgage Securities, Inc., 5.307%, 4/10/40 770,364 900,000 NR/Aaa GS Mortgage Securities Corp. II, 5.56%, 11/10/39 988,113 1,770,000 NR/Aa3 GS Mortgage Securities Corp. II, 5.591%, 11/10/39 1,792,178 1,046,240 AAA/Aaa GS Mortgage Securities Corp. II, 7.12%, 11/18/29 1,056,877 1,907,300 AAA/NR GSR Mortgage Loan Trust, 2.5125%, 8/25/33 1,726,298 472,907 BBB-/NR GSR Mortgage Loan Trust, 2.911%, 1/25/35 420,484 1,003,712 AAA/Ba3 GSR Mortgage Loan Trust, 4.1408%, 6/25/34 917,337 297,110 BBB+/NR GSR Mortgage Loan Trust, 5.7199%, 2/25/34 255,083 1,017,780 1.01 AAA/A1 Impac CMB Trust, Floating Rate Note, 10/25/34 876,853 674,312 1.09 AAA/Aaa Impac Securities Assets Corp., Floating Rate Note, 11/25/34 596,362 1,180,092 0.64 AAA/Aaa Impac Securities Assets Corp., Floating Rate Note, 5/25/36 990,269 1,750,000 AA+/Aaa JPMCC 2002-C3 B, 5.146%, 7/12/35 1,769,472 1,387,246 4.89 AAA/A2 JPMMT 2004-A1 3A1, Floating Rate Note, 2/25/34 1,392,469 2,699,135 BBB/Ba2 JPMMT 2004-S1 2A1, 6.0%, 9/25/34 2,752,886 1,100,000 A-/Aa3 JPMorgan Chase Commercial Mortgage Securities Corp., 0.34205%, 5/15/47 1,002,019 1,600,000 AAA/NR JPMorgan Chase Commercial Mortgage Securities Corp., 3.6159%, 11/15/43 1,655,355 1,350,000 NR/Aaa JPMorgan Chase Commercial Mortgage Securities Corp., 4.1712%, 8/15/46 1,445,592 1,000,000 BBB+/Baa1 JPMorgan Chase Commercial Mortgage Securities Corp., 4.65%, 7/15/28 979,333 1,967,024 AAA/A2 JPMorgan Mortgage Trust, 2.657%, 2/25/34 1,912,927 989,621 AAA/NR JPMorgan Mortgage Trust, 2.675589%, 7/25/34 955,944 3,220,290 AAA/Aa3 JPMorgan Mortgage Trust, 4.498731%, 10/25/33 3,118,554 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 25 Schedule of Investments | 12/31/11 (unaudited) (continued) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 1,967,699 2.00 AAA/Aa3 JPMorgan Mortgage Trust, Floating Rate Note, 10/25/33 $ 1,902,678 2,800,000 BBB+/NR LB-UBS Commercial Mortgage Trust, 5.616%, 10/15/35 2,711,391 890,075 AAA/Aaa Lehman Brothers Small Balance Commercial, 5.41%, 12/25/36 878,580 1,104,560 0.54 AAA/Aa1 Lehman Brothers Small Balance Commercial, Floating Rate Note, 2/25/30 864,478 441,704 1.14 AAA/Aaa Lehman Brothers Small Balance Commercial, Floating Rate Note, 10/25/37 442,116 755,362 AAA/A1 Master Adjustable Rate Mortgage Trust, 2.86771%, 4/21/34 721,480 1,358,033 BB+/B3 Master Adjustable Rate Mortgage Trust, 5.194229%, 1/25/35 1,167,399 892,975 A-/NR Master Alternative Loan Trust, 4.5%, 1/25/15 892,196 508,181 B-/NR Master Alternative Loan Trust, 5.5%, 1/25/35 518,168 1,877,131 B+/NR Master Alternative Loan Trust, 5.5%, 10/25/19 1,922,891 2,458,911 AAA/NR Master Alternative Loan Trust, 5.5%, 2/25/35 2,520,173 3,409,552 B/AAA Master Alternative Loan Trust, 6.0%, 7/25/34 3,384,106 1,566,566 2.00 A-/NR Master Seasoned Securities Trust, Floating Rate Note, 9/25/32 1,639,767 480,720 AAA/Aaa Merrill Lynch Mortgage Trust, 4.556%, 6/12/43 484,363 133,649 5.44 AAA/Aaa Merrill Lynch/Countrywide Commercial Mortgage, Floating Rate Note, 2/12/39 133,737 2,569,845 AAA/Baa2 MLCC Mortgage Investors, Inc., 0.48344%, 3/25/30 2,082,972 1,550,539 0.52 AAA/Baa2 MLCC Mortgage Investors, Inc., Floating Rate Note, 4/25/29 1,311,571 2,950,000 NR/NR Morgan Stanley Reremic Trust, 5.0%, 11/26/36 2,850,143 1,344,853 NR/Aa3 PHH Mortgage Capital, 6.6%, 12/25/27 1,311,931 893,977 BB/B2 RAAC Series, 6.0%, 1/25/32 913,219 1,269,081 AA-/NR Residential Asset Securitization Trust, 5.25%, 11/25/34 1,283,850 1,130,709 B-/NR Residential Asset Securitization Trust, 5.5%, 2/25/35 1,143,481 2,105,274 B/NR Residential Asset Securitization Trust, 5.5%, 7/25/35 1,874,291 2,695,317 BBB+/NR Residential Asset Securitization Trust, 5.75%, 12/25/34 2,758,506 The accompanying notes are an integral part of these financial statements. 26 Pioneer Bond Fund | Semiannual Report | 12/31/11 ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 8,510,000 5.54 NR/Caa3 SASC 2007 BHC1 A1, Floating Rate Note, 12/18/49 $ 1,176,933 2,890,000 5.58 NR/NR SASC 2007 BHC1 A2, Floating Rate Note, 12/18/49 (c) 165,568 1,427,333 AAA/A3 Sequoia Mortgage Trust, 0.74969%, 1/20/35 1,097,038 769,270 NR/NR Sequoia Mortgage Trust, 3.9%, 9/25/41 774,586 1,606,966 0.50 AAA/Ba3 Sequoia Mortgage Trust, Floating Rate Note, 3/20/35 1,257,568 1,744,483 0.90 AAA/Baa1 Sequoia Mortgage Trust, Floating Rate Note, 9/20/33 1,524,235 1,590,693 AAA/A3 Structured Asset Securities Corp., 2.6671%, 10/25/33 1,413,383 1,192,624 B-/B2 Structured Asset Securities Corp., 5.0%, 5/25/35 1,173,479 1,435,000 AA/Aa3 T SRAR 2006-1 B, 5.7467%, 10/15/36 1,516,581 1,636,540 AAA/Ba1 Thornburg Mortgage Securities Trust, 4.1376%, 3/25/44 1,557,063 2,970,168 1.03 AAA/A2 Thornburg Mortgage Securities Trust, Floating Rate Note, 9/25/44 2,543,666 4,470,000 AAA/Aa1 TSTAR 2006-1A A, 5.668%, 10/15/36 4,992,060 3,787,250 AAA/Aaa Wachovia Bank Commercial Mortgage Trust, 4.803%, 10/15/41 4,056,077 2,500,000 A+/NR Wachovia Bank Commercial Mortgage Trust, 5.606%, 4/15/35 2,493,475 724,870,648 AAA/Aaa Wachovia Bank Commercial Mortgage Trust, 0.015222%, 6/15/45 611,791 1,645,517 AAA/Baa3 WaMu Mortgage Pass Through Certificates, 2.578211%, 6/25/34 1,591,041 3,326,780 AA/NR WaMu Mortgage Pass Through Certificates, 2.73272%, 1/25/35 3,010,464 364,875 CCC/NR WaMu Mortgage Pass Through Certificates, 2.77149%, 9/25/35 287,253 265,206 CC/NR WaMu Mortgage Pass Through Certificates, 4.82069%, 9/25/35 258,522 1,831,836 AAA/NR WaMu Mortgage Pass Through Certificates, 5.5%, 5/25/33 1,912,983 3,630,922 NR/Aaa Wells Fargo Commercial Mortgage, 3.349%, 10/15/57 3,748,901 2,107,055 AAA/Ba2 Wells Fargo Mortgage Backed Securities Trust, 4.75%, 12/25/18 2,173,006 1,004,483 AAA/A1 Wells Fargo Mortgage Backed Securities Trust, 5.0%, 11/25/36 1,013,621 350,000 NR/A2 Wells Fargo Mortgage Backed Securities Trust, 5.392%, 2/15/44 313,093 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 27 Schedule of Investments | 12/31/11 (unaudited) (continued) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 207,006 AAA/Baa1 Wells Fargo Mortgage Backed Securities Trust, 5.5%, 5/25/35 $ 205,286 1,089,118 2.62 NR/Ba3 Wells Fargo Mortgage Backed Securities Trust, Floating Rate Note, 1/25/35 896,499 633,162 2.71 AAA/Aa1 Wells Fargo Mortgage Backed Securities Trust, Floating Rate Note, 10/25/34 609,194 696,420 2.69 BBB-/B1 Wells Fargo Mortgage Backed Securities Trust, Floating Rate Note, 10/25/35 627,709 603,515 4.51 AAA/A1 Wells Fargo Mortgage Backed Securities Trust, Floating Rate Note, 11/25/33 592,840 382,814 5.62 B-/NR Wells Fargo Mortgage Backed Securities Trust, Floating Rate Note, 4/25/36 374,291 260,506 2.73 AAA/A2 Wells Fargo Mortgage Backed Securities Trust, Floating Rate Note, 6/25/34 244,514 -------------- $ 156,605,688 -------------- Total Banks $ 156,605,688 ----------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 3.4% Asset Management & Custody Banks -- 0.1% 773,243 4.01 NR/NR Jefferies & Co., Inc., Floating Rate Note, 5/26/37 $ 762,240 ----------------------------------------------------------------------------------------------------------- Diversified Financial Services -- 2.8% 1,931,152 A+/NR Banc of America Mortgage Securities, 5.5%, 11/25/34 $ 2,011,882 2,735,489 AAA/NR Banc of America Mortgage Securities, 5.75%, 1/25/35 2,796,985 1,359,189 2.79 AAA/Baa3 Banc of America Mortgage Securities, Floating Rate Note, 10/25/33 1,240,000 4,020,433 2.84 NR/Baa3 Banc of America Mortgage Securities, Floating Rate Note, 11/25/33 3,617,340 573,574 2.87 NR/Ba3 Banc of America Mortgage Securities, Floating Rate Note, 5/25/35 558,163 515,824 2.75 AAA/Aaa Banc of America Mortgage Securities, Floating Rate Note, 6/25/34 487,022 1,667,226 2.88 AAA/Aaa Banc of America Mortgage Securities, Floating Rate Note, 7/25/33 1,560,349 907,949 4.97 AA-/NR Banc of America Mortgage Securities, Floating Rate Note, 9/25/35 848,244 1,117,460 NR/B1 CMSI 2006-1 3A1, 5.0%, 2/25/36 1,106,870 2,950,000 BBB+/A2 Credit Suisse Mortgage Capital Certificates, 0.318%, 2/15/22 2,699,250 1,200,000 BBB/A1 Credit Suisse Mortgage Capital Certificates, 5.343%, 12/15/39 1,088,153 1,900,000 5.57 NR/Aa2 DBUBS Mortgage Trust, Floating Rate Note, 7/10/21 1,813,656 The accompanying notes are an integral part of these financial statements. 28 Pioneer Bond Fund | Semiannual Report | 12/31/11 ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Diversified Financial Services -- (continued) 1,260,440 CCC/NR JPMorgan Alternative Loan Trust, 5.5%, 3/25/36 $ 824,445 1,844,819 CCC/NR JPMorgan Alternative Loan Trust, 6.0%, 3/25/36 1,308,165 707,571 3.50 NR/NR La Hipotecaria SA, Floating Rate Note, 9/8/39 733,221 1,395,000 NR/A2 LSTAR Commercial Mortgage Trust, 5.7457%, 6/25/43 1,293,617 923,928 B-/Aaa MLMI 2005-A2 A4, 4.48%, 2/25/35 878,614 882,054 AAA/Aaa Morgan Stanley Capital I, 0.779%, 12/15/20 852,971 2,060,777 5.50 AAA/B2 RALI 2004-QS16 1A1, Floating Rate Note, 12/25/34 2,084,099 4,259,070 NR/Ba1 Residential Accredit Loans, Inc., 5.0%, 5/25/19 4,260,109 1,240,817 NR/Ba1 Residential Accredit Loans, Inc., 5.0%, 7/25/18 1,261,312 2,326,780 AAA/NR Residential Accredit Loans, Inc., 6.0%, 10/25/34 2,355,469 914,514 CCC/Caa3 Residential Accredit Loans, Inc., 0.49875%, 5/25/47 491,315 1,303,651 AAA/Baa1 Structured Adjustable Rate Mortgage Loan Trust, 2.3592%, 3/25/34 1,146,220 412,926 NR/NR Vericrest Opportunity Loan Transferee, 5.926%, 12/26/50 413,443 -------------- $ 37,730,914 ----------------------------------------------------------------------------------------------------------- Investment Banking & Brokerage -- 0.5% 1,440,000 AAA/Aaa Banc of America Commercial Mortgage, Inc., 4.877%, 7/10/42 $ 1,533,244 645,940 AAA/Aaa Banc of America Commercial Mortgage, Inc., 5.381%, 1/15/49 645,115 1,168,000 NR/Aaa Bear Stearns Commercial Mortgage Securities, 5.7154%, 5/11/17 1,278,739 1,250,000 BB+/A3 Bear Stearns Commercial Mortgage Securities, 5.760%, 9/11/38 980,236 947,288 AA/NR Bear Stearns Commercial Mortgage Securities, 6.63%, 2/15/35 946,734 1,600,000 7.28 BBB+/Baa2 Bear Stearns Commercial Mortgage Securities, Floating Rate Note, 10/15/36 1,573,285 -------------- $ 6,957,353 ----------------------------------------------------------------------------------------------------------- Specialized Finance -- 0.0% 566,067 AAA/NR CW Capital Cobalt, Ltd., 5.174%, 8/15/48 $ 573,592 -------------- Total Diversified Financials $ 46,024,099 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 29 Schedule of Investments | 12/31/11 (unaudited) (continued) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- REAL ESTATE -- 0.6% Mortgage Real Estate Investment Trusts -- 0.6% 504,604 AAA/NR Credit Suisse First Boston Mortgage Securities Corp., 5.5%, 6/25/33 $ 492,907 3,250,000 CCC-/A3 Credit Suisse First Boston Mortgage Securities Corp., 6.448%, 9/15/34 3,105,700 675,000 A+/Baa2 Credit Suisse First Boston Mortgage Securities Corp., 7.165%, 12/15/35 676,828 1,655,313 1.64 AA+/Aa2 Credit Suisse First Boston Mortgage Securities Corp., Floating Rate Note, 12/25/33 1,576,659 400,000 4.52 A-/A3 Credit Suisse First Boston Mortgage Securities Corp., Floating Rate Note, 5/15/38 378,515 1,317,574 1.79 AA+/WR Credit Suisse First Boston Mortgage Securities Corp., Floating Rate Note, 8/25/33 1,208,819 -------------- $ 7,439,428 ----------------------------------------------------------------------------------------------------------- Real Estate Services -- 0.0% 430,252 AAA/Aaa Morgan Stanley Capital I, 7.0%, 7/25/33 $ 448,784 -------------- Total Real Estate $ 7,888,212 ----------------------------------------------------------------------------------------------------------- TOTAL COLLATERALIZED MORTGAGE OBLIGATIONS (Cost $226,059,354) $ 210,517,999 ----------------------------------------------------------------------------------------------------------- CORPORATE BONDS -- 35.0% ENERGY -- 3.8% Oil & Gas Drilling -- 0.1% 1,025,000 BBB+/Baa1 Pride International, 6.875%, 8/15/20 $ 1,201,740 ----------------------------------------------------------------------------------------------------------- Oil & Gas Equipment & Services -- 0.3% 2,815,000 BBB/Baa2 Weatherford International, Ltd., 9.625%, 3/1/19 $ 3,640,617 ----------------------------------------------------------------------------------------------------------- Oil & Gas Exploration & Production -- 0.8% 2,292,000 BB-/B1 Denbury Resources, Inc., 8.25%, 2/15/20 $ 2,561,310 1,231,541 BBB+/NR Gazprom International SA, 7.201%, 2/1/20 RegS 1,300,816 901,000 BBB/Baa2 Marathon Oil Corp., 5.9%, 3/15/18 1,054,775 1,245,159 A/Aa3 Ras Laffan Liquefied Natural Gas Co., Ltd. III, 5.832%, 9/30/16 (144A) 1,332,320 1,000,000 BBB-/Baa2 TNK-BP Finance SA, 6.625%, 3/20/17 (144A) 1,015,000 2,080,000 BBB-/Baa2 TNK-BP Finance SA, 7.5%, 7/18/16 (144A) 2,194,400 1,000,000 BBB-/Baa2 TNK-BP Finance SA, 7.875%, 3/13/18 (144A) 1,068,750 -------------- $ 10,527,371 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 30 Pioneer Bond Fund | Semiannual Report | 12/31/11 ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Oil & Gas Refining & Marketing -- 0.9% 2,900,000 BB/Ba3 Coffeyville Resources LLC, 9.0%, 4/1/15 $ 3,074,000 2,475,000 BBB/Baa2 Spectra Energy Capital, 6.2%, 4/15/18 2,806,462 2,200,000 BBB/Baa2 Sunoco Logistics Partners Operations LP, 6.1%, 2/15/42 2,354,310 2,890,000 BBB/Baa2 Valero Energy Corp., 9.375%, 3/15/19 3,705,986 -------------- $ 11,940,758 ----------------------------------------------------------------------------------------------------------- Oil & Gas Storage & Transporation -- 1.7% 435,000 BBB-/Baa2 Boardwalk Pipelines LLC, 5.5%, 2/1/17 $ 474,317 1,535,000 BBB/Baa3 Buckeye Partners LP, 6.05%, 1/15/18 1,700,121 2,900,000 BBB/Baa2 DCP Midstream, 9.75%, 3/15/19 3,780,408 1,150,000 BB-/B1 Holly Energy Partners LP, 6.25%, 3/1/15 1,158,625 3,250,000 BBB/Baa2 Kinder Morgan Energy, 5.95%, 2/15/18 3,712,943 3,500,000 BBB-/Baa3 Plains All America Pipeline, 6.125%, 1/15/17 3,956,890 3,885,000 A/A3 Questar Pipeline Co., 5.83%, 2/1/18 4,544,836 2,000,000 BB/Ba1 Southern Union Co., 7.2%, 11/1/66 1,865,000 1,500,000 BBB/Baa2 Spectra Energy Capital LLC, 6.75%, 7/15/18 1,688,846 -------------- $ 22,881,986 -------------- Total Energy $ 50,192,472 ----------------------------------------------------------------------------------------------------------- MATERIALS -- 2.0% Aluminum -- 0.2% 2,425,000 BBB-/Baa3 Alcoa, Inc., 6.15%, 8/15/20 $ 2,519,517 ----------------------------------------------------------------------------------------------------------- Commodity Chemicals -- 0.1% 1,700,000 BB-/Ba2 Nova Chemicals Corp., 8.375%, 11/1/16 $ 1,853,000 ----------------------------------------------------------------------------------------------------------- Construction Materials -- 0.2% 2,225,000 6.72 CCC+/BBB- C10 Capital SPV, Ltd., Floating Rate Note, 12/31/49 $ 1,145,875 2,260,000 6.64 CCC+/NR C8 Capital SPV, Ltd., Floating Rate Note, 12/31/49 1,220,400 475,000 BBB/Baa2 Holcim, Ltd., 6.0%, 12/30/19 (144A) 489,473 -------------- $ 2,855,748 ----------------------------------------------------------------------------------------------------------- Diversified Metals & Mining -- 0.7% 3,085,000 BBB-/Baa3 AngloGold Ashanti Holdings, 5.375%, 4/15/20 $ 3,064,809 5,000,000 BBB-/Baa3 Gold Fields Orogen Holding BVI, 4.875%, 10/7/20 4,414,705 950,000 BBB/Baa2 Teck Resources, Ltd., 10.25%, 5/15/16 1,092,500 -------------- $ 8,572,014 ----------------------------------------------------------------------------------------------------------- Paper Products -- 0.1% 1,350,000 A-/Baa3 Georgia-Pacific LLC, 5.4%, 11/1/20 $ 1,495,325 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 31 Schedule of Investments | 12/31/11 (unaudited) (continued) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Specialty Chemicals -- 0.2% 2,400,000 BBB/Baa2 Cytec Industries, Inc., 8.95%, 7/1/17 $ 2,870,964 ----------------------------------------------------------------------------------------------------------- Steel -- 0.5% 500,000 BBB-/Baa3 ArcelorMittal, 5.5%, 3/1/21 $ 458,955 3,900,000 BBB-/Baa3 ArcelorMittal, 6.125%, 6/1/18 3,851,492 2,805,000 BB+/Ba1 Commercial Metals Co., 7.35%, 8/15/18 2,650,725 -------------- $ 6,961,172 -------------- Total Materials $ 27,127,740 ----------------------------------------------------------------------------------------------------------- CAPITAL GOODS -- 2.8% Aerospace & Defense -- 0.3% 3,020,000 BB/Ba3 Esterline Technology, 6.625%, 3/1/17 $ 3,125,700 ----------------------------------------------------------------------------------------------------------- Building Products -- 0.3% 4,260,000 BBB-/Ba2 Masco Corp., 7.125%, 3/15/20 $ 4,299,294 ----------------------------------------------------------------------------------------------------------- Construction & Farm Machinery & Heavy Trucks -- 0.1% 910,000 A/Baa2 Cummins, Inc., 6.75%, 2/15/27 $ 1,108,614 600,000 BB/B2 Oshkosh Corp., 8.5%, 3/1/20 618,000 -------------- $ 1,726,614 ----------------------------------------------------------------------------------------------------------- Electrical Components & Equipment -- 0.4% 2,665,000 BB/Ba2 Anixter International Corp., 5.95%, 3/1/15 $ 2,698,313 2,670,000 B+/Ba2 Belden CDT, Inc., 7.0%, 3/15/17 2,666,663 -------------- $ 5,364,976 ----------------------------------------------------------------------------------------------------------- Industrial Conglomerates -- 0.3% 2,950,000 BBB/Baa2 Tyco Electronics Group SA, 6.55%, 10/1/17 $ 3,407,834 525,000 A-/A3 Tyco International Finance SA, 8.5%, 1/15/19 676,241 -------------- $ 4,084,075 ----------------------------------------------------------------------------------------------------------- Industrial Machinery -- 0.4% 2,150,000 BBB+/Baa1 Ingersoll-Rand Global Holdings, 9.5%, 4/15/14 $ 2,499,098 1,810,000 BBB-/Baa3 Valmont Industries, Inc., 6.625%, 4/20/20 2,094,959 -------------- $ 4,594,057 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 32 Pioneer Bond Fund | Semiannual Report | 12/31/11 ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Trading Companies & Distributors -- 1.0% 495,000 BB-/Ba2 Ace Hardware Corp., 9.125%, 6/1/16 (144A) $ 524,700 3,525,000 BBB-/BBB- Aviation Capital Group Corp., 6.75%, 4/6/21 3,321,185 5,660,000 BBB/Baa1 GATX Financial Corp., 6.0%, 2/15/18 6,277,048 3,450,000 BBB/Baa2 Glencore Funding LLC, 6.0%, 4/15/14 (144A) 3,563,571 -------------- $ 13,686,504 -------------- Total Capital Goods $ 36,881,220 ----------------------------------------------------------------------------------------------------------- COMMERCIAL SERVICES & SUPPLIES -- 0.2% Office Services & Supplies -- 0.2% 3,110,000 BBB+/A2 Pitney Bowes, Inc., 5.6%, 3/15/18 $ 3,221,036 -------------- Total Commercial Services & Supplies $ 3,221,036 ----------------------------------------------------------------------------------------------------------- TRANSPORTATION -- 0.2% Airlines -- 0.2% 1,865,000 BBB-/Baa3 American Airlines 2011-2 Class A Pass Through Trust, 8.625%, 10/15/21 $ 1,902,300 603,045 BBB/Baa2 Southwest Airlines Co., 7.67%, 1/2/14 633,439 -------------- $ 2,535,739 -------------- Total Transportation $ 2,535,739 ----------------------------------------------------------------------------------------------------------- AUTOMOBILES & COMPONENTS -- 0.1% Automobile Manufacturers -- 0.1% 655,000 BBB/Baa2 Hyundai Motor Manufacturer, 4.5%, 4/15/15 $ 670,649 790,000 BBB+/Baa1 Nissan Motor Acceptance Corp., 4.5%, 1/30/15 (144A) 820,793 -------------- $ 1,491,442 -------------- Total Automobiles & Components $ 1,491,442 ----------------------------------------------------------------------------------------------------------- CONSUMER DURABLES & APPAREL -- 0.3% Household Appliances -- 0.3% 4,235,000 BBB-/Baa3 Whirlpool Corp., 5.5%, 3/1/13 $ 4,401,228 -------------- Total Consumer Durables & Apparel $ 4,401,228 ----------------------------------------------------------------------------------------------------------- CONSUMER SERVICES -- 0.4% Education Services -- 0.4% 1,100,000 AAA/Aaa Massachusetts Institute of Technology, 5.6%, 7/1/11 $ 1,513,193 3,095,000 AAA/Aaa President & Fellows of Harvard, 6.3%, 10/1/37 3,506,697 -------------- $ 5,019,890 -------------- Total Consumer Services $ 5,019,890 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 33 Schedule of Investments | 12/31/11 (unaudited) (continued) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- RETAILING -- 0.3% Internet Retail -- 0.3% 800,000 BBB-/Ba1 Expedia, Inc., 5.95%, 8/15/20 $ 806,746 3,000,000 BBB-/Ba1 Expedia, Inc., 8.5%, 7/1/16 (144A) 3,235,365 -------------- $ 4,042,111 -------------- Total Retailing $ 4,042,111 ----------------------------------------------------------------------------------------------------------- FOOD & DRUG RETAILING -- 0.2% Drug Retail -- 0.2% 782,049 BBB+/Baa2 CVS Pass-Through Trust, 5.298%, 1/11/27 $ 774,228 1,521,945 BBB+/Baa2 CVS Pass-Through Trust, 5.773%, 1/10/33 1,555,550 -------------- $ 2,329,778 -------------- Total Food & Drug Retailing $ 2,329,778 ----------------------------------------------------------------------------------------------------------- FOOD, BEVERAGE & TOBACCO -- 0.8% Agricultural Products -- 0.4% 5,175,000 BBB-/Ba1 Viterra, Inc., 5.95%, 8/1/20 $ 5,288,617 ----------------------------------------------------------------------------------------------------------- Packaged Foods & Meats -- 0.4% 3,725,000 BBB-/Baa2 Kraft Foods, Inc., 6.5%, 2/9/40 $ 4,846,002 -------------- Total Food, Beverage & Tobacco $ 10,134,619 ----------------------------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 0.1% Health Care Facilities -- 0.1% 1,050,000 BB/Ba3 HCA, Inc., 7.875%, 2/15/20 $ 1,134,000 385,000 BB/Ba3 HCA, Inc., 8.5%, 4/15/19 421,575 202,000 BB/B2 HCA, Inc., 9.875%, 2/15/17 220,685 -------------- $ 1,776,260 -------------- Total Health Care Equipment & Services $ 1,776,260 ----------------------------------------------------------------------------------------------------------- PHARMACEUTICALS & BIOTECHNOLOGY -- 0.6% Life Sciences Tools & Services -- 0.5% 5,366,000 BBB-/Baa2 Agilent Technologies, Inc., 6.5%, 11/1/17 $ 6,214,069 ----------------------------------------------------------------------------------------------------------- Pharmaceuticals -- 0.1% 1,000,000 AA/A1 Abbott Laboratories, 5.125%, 4/1/19 $ 1,161,139 -------------- Total Pharmaceuticals & Biotechnology $ 7,375,208 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 34 Pioneer Bond Fund | Semiannual Report | 12/31/11 ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- BANKS -- 3.7% Diversified Banks -- 1.0% 3,515,000 BBB+/Baa1 Barclays Plc, 6.05%, 12/4/17 $ 3,178,467 3,815,000 NR/A2 BBVA Bancomer SA, 6.5%, 3/10/21 3,676,706 2,820,000 BBB-/Baa1 Credit Agricole SA, 8.375%, 12/13/49 2,115,000 1,855,000 A/A1 Industrial Bank of Korea, 7.125%, 4/23/14 2,026,042 2,000,000 3.30 A/NR Scotiabank Peru SA, Floating Rate Note, 3/15/17 (144A) 1,991,452 -------------- $ 12,987,667 ----------------------------------------------------------------------------------------------------------- Regional Banks -- 2.7% 3,335,000 BB/Baa3 Capitial One Capital VI, 8.875%, 5/15/40 $ 3,461,366 1,190,000 A/NR Cobank ACB, 7.875%, 4/16/18 (144A) 1,423,910 2,505,000 A/Aa3 Mellon Funding Corp., 5.5%, 11/15/18 2,776,259 1,435,000 A/A3 PNC Bank NA, 6.0%, 12/7/17 1,593,965 1,050,000 BBB/Baa3 PNC Financial Services Group, 6.75%, 7/29/49 1,026,827 6,273,000 8.25 BBB/Baa3 PNC Financial Services Group, Floating Rate Note, 5/29/49 6,418,565 1,500,000 8.70 BBB/Baa3 PNC Preferred Funding Trust III, Floating Rate Note, 3/29/49 1,524,495 4,080,000 A/A3 Sovereign Bancorp, 8.75%, 5/30/18 4,549,155 9,470,000 BBB+/Baa1 State Street Capital, 8.25%, 1/29/49 9,315,923 3,520,000 A+/A1 Wachovia Bank NA, 6.0%, 11/15/17 3,886,865 -------------- $ 35,977,330 -------------- Total Banks $ 48,964,997 ----------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 7.3% Asset Management & Custody Banks -- 0.8% 2,000,000 A/Aa3 Bank of New York, 4.95%, 3/15/15 $ 2,158,040 3,945,000 A-/A3 Eaton Vance Corp., 6.5%, 10/2/17 4,427,477 4,050,000 BBB-/Baa3 Janus Capital Group, Inc., 6.95%, 6/15/17 4,297,803 -------------- $ 10,883,320 ----------------------------------------------------------------------------------------------------------- Consumer Finance -- 0.9% 1,465,000 BBB/Baa1 Capital One Bank USA NA, 8.8%, 7/15/19 $ 1,675,945 2,575,000 A/A2 Caterpillar Financial, 7.05%, 10/1/18 3,265,955 3,155,000 4.00 BBB-/Ba1 SLM Corp., Floating Rate Note, 7/25/14 2,928,660 4,435,000 B/B3 Springleaf Finance Corp., 6.9%, 12/15/17 3,193,200 -------------- $ 11,063,760 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 35 Schedule of Investments | 12/31/11 (unaudited) (continued) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Diversified Financial Services -- 2.3% 3,800,000 BBB+/Baa2 Alterra Finance LLC, 6.25%, 9/30/20 $ 4,002,529 875,000 0.00 BB+/NR Caelus Re II, Ltd., Floating Rate Note, 5/24/13 885,063 300,000 NR/NR Compass Re, Ltd., 0.0%, 1/8/15 297,240 375,000 NR/NR Compass Re, Ltd., 0.0%, 1/8/15 373,988 4,860,000 AA/Aa3 General Electric Capital Corp., 5.3%, 2/11/21 5,195,107 1,840,000 BBB+/Baa2 Hyundai Capital Services, Inc., 6.0%, 5/5/15 1,974,408 2,575,000 A/Aa3 JPMorgan Chase & Co., 6.0%, 1/15/18 2,872,873 6,140,000 BBB/Baa1 JPMorgan Chase & Co., 7.9%, 4/29/49 6,537,197 2,400,000 BB/NR Lodestone Re, Ltd., 0.0%, 1/8/14 2,364,720 1,650,000 BB/NR Lodestone Re, Ltd., 0.0%, 5/17/13 (144A) 1,656,270 250,000 8.37 BB-/NR Lodestone Re, Ltd., Floating Rate Note, 5/17/13 (144A) 250,425 600,000 9.72 BB-/NR Loma Reinsurance, Ltd., Floating Rate Note, 12/21/12 616,200 1,100,000 BBB+/Baa2 Nationsbank Corp., 7.75%, 8/15/15 1,114,025 156,429 BBB/Baa2 Power Receivables Finance LLC, 6.29%, 1/1/12 (144A) 156,429 750,000 0.00 BB-/NR Queen Street II Capital, Ltd., Floating Rate Note, 4/9/14 747,750 250,000 0.00 BB-/NR Queen Street IV Capital, Ltd., Floating Rate Note, 4/9/15 243,525 1,250,000 0.66 BB/NR Residential Reinsurance 2010, Ltd., Floating Rate Note, 6/6/13 (144A) 1,262,875 400,000 0.90 B+/NR Residential Reinsurance 2011, Ltd., Floating Rate Note, 6/6/15 406,480 -------------- $ 30,957,104 ----------------------------------------------------------------------------------------------------------- Investment Banking & Brokerage -- 2.3% 674,088 BBB-/NR Alta Wind Holdings LLC, 7.0%, 6/30/35 (144A) $ 741,025 11,040,000 5.79 BB+/Baa2 Goldman Sachs Capital, Floating Rate Note, 6/1/43 6,789,600 2,000,000 A-/A1 Goldman Sachs, 5.5%, 11/15/14 2,060,538 600,000 BBB/Baa2 Jefferies Group, Inc., 5.125%, 4/13/18 528,000 3,125,000 BBB/Baa2 Jefferies Group, Inc., 6.875%, 4/15/21 2,812,500 250,000 BBB/Baa2 Jefferies Group, Inc., 8.5%, 7/15/19 253,750 3,000,000 A-/A2 Macquarie Bank, Ltd., 6.625%, 4/7/21 2,765,871 2,730,000 A-/A2 Macquarie Group, Ltd., 6.0%, 1/14/20 2,560,751 3,875,000 A-/Baa1 Merrill Lynch & Co., 5.45%, 2/5/13 3,903,167 2,765,000 A-/A2 Morgan Stanley Dean Witter, 6.625%, 4/1/18 2,730,280 3,125,000 A-/A2 Morgan Stanley, 5.5%, 1/26/20 2,844,609 The accompanying notes are an integral part of these financial statements. 36 Pioneer Bond Fund | Semiannual Report | 12/31/11 ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Investment Banking & Brokerage -- (continued) 250,000 0.00 B+/NR Queen Street III Capital, Floating Rate Note, 7/28/14 $ 247,700 2,550,000 NR/Baa3 Scottrade Financial Services, Inc., 6.125%, 7/11/21 2,559,438 -------------- $ 30,797,229 ----------------------------------------------------------------------------------------------------------- Specialized Finance -- 1.0% 2,850,000 BBB/Baa1 Banque PSA Finance, 5.75%, 4/4/21 $ 2,573,769 2,900,000 BBB+/Baa1 BM&FBovespa SA, 5.5%, 7/16/20 2,972,500 5,205,000 BBB/Baa3 Cantor Fitzgerald LP, 7.875%, 10/15/19 5,019,494 2,000,000 A+/A1 National Rural Utilities Corp., 5.45%, 2/1/18 2,303,434 -------------- $ 12,869,197 -------------- Total Diversified Financials $ 96,570,610 ----------------------------------------------------------------------------------------------------------- INSURANCE -- 4.8% Life & Health Insurance -- 1.7% 1,850,000 BBB/Baa3 Delphi Financial Group, Inc., 7.875%, 1/31/20 $ 2,103,102 3,380,000 BBB/Ba1 Lincoln National Corp., 6.05%, 4/20/67 2,813,850 1,690,000 A-/Baa2 Lincoln National Corp., 8.75%, 7/1/19 2,055,647 4,200,000 BBB/Baa2 MetLife, Inc., 10.75%, 8/1/39 5,544,000 4,250,000 A-/Baa2 Protective Life Corp., 7.375%, 10/15/19 4,716,348 2,800,000 A/Baa2 Prudential Financial, Inc., 5.15%, 1/15/13 2,898,829 2,140,000 BBB+/Baa3 Prudential Financial, Inc., 8.875%, 6/15/38 2,450,300 -------------- $ 22,582,076 ----------------------------------------------------------------------------------------------------------- Multi-Line Insurance -- 1.0% 3,960,000 BBB/Baa3 Genworth Financial, Inc., 7.2%, 2/15/21 $ 3,613,761 4,620,000 BB/Baa3 Liberty Mutual Group, 7.0%, 3/15/37 (144A) 3,880,800 3,035,000 BBB-/Baa2 Liberty Mutual Group, 7.3%, 6/15/14 (144A) 3,249,374 85,000 10.75 BB/Baa3 Liberty Mutual Group, Floating Rate Note, 6/15/58 (144A) 106,675 2,650,000 A+/A3 Loew Corp., 5.25%, 3/15/16 2,917,669 -------------- $ 13,768,279 ----------------------------------------------------------------------------------------------------------- Property & Casualty Insurance -- 1.3% 5,000,000 BBB-/Baa3 Hanover Insurance Group, 7.625%, 10/15/25 $ 5,691,590 700,000 BBB-/Baa3 The Hanover Insurance Group, Inc., 7.5%, 3/1/20 802,211 2,000,000 A/A2 Travelers Companies, Inc., 6.25%, 6/15/37 2,486,948 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 37 Schedule of Investments | 12/31/11 (unaudited) (continued) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Property & Casualty Insurance -- (continued) 3,600,000 BBB/Baa3 White Mountains Re Group, Ltd., 6.375%, 3/20/17 $ 3,775,856 1,750,000 BB+/Ba2 White Mountains Re Group, Ltd., 7.506%, 5/29/49 1,594,320 3,275,000 BBB-/Ba1 XL Group Plc, 6.5%, 3/29/49 2,562,688 -------------- $ 16,913,613 ----------------------------------------------------------------------------------------------------------- Reinsurance -- 0.8% 400,000 B+/NR Atlas V Capital, Ltd., 11.87211%, 2/24/12 $ 404,720 600,000 0.58 BB/A2 Foundation Re III, Ltd., Floating Rate Note, 2/3/14 599,760 800,000 5.02 BB+/NR Foundation Re III, Ltd., Floating Rate Note, 2/25/15 795,680 750,000 12.25 BB/NR Mystic Re, Floating Rate Note, 3/20/12 762,825 5,048,000 BBB/BBB+ Platinum Underwriters HD, 7.5%, 6/1/17 5,312,641 1,450,000 BBB-/Baa3 Reinsurance Group of America, Inc., 6.75%, 12/15/65 1,257,037 250,000 B-/NR Successor X, Ltd., 11.251351%, 11/10/15 247,375 1,400,000 9.42 B/NR Successor X, Ltd., Floating Rate Note, 2/25/14 1,401,680 -------------- $ 10,781,718 -------------- Total Insurance $ 64,045,686 ----------------------------------------------------------------------------------------------------------- REAL ESTATE -- 3.1% Diversified Real Estate Activities -- 0.4% 4,125,000 A-/A2 WEA Finance LLC, 7.125%, 4/15/18 $ 4,610,195 ----------------------------------------------------------------------------------------------------------- Diversified Real Estate Investment Trusts -- 0.8% 4,555,000 BBB+/Baa1 Dexus Finance Pty, Ltd., 7.125%, 10/15/14 $ 4,974,374 1,765,000 BBB/Baa2 Digital Realty Trust LP, 4.5%, 7/15/15 1,800,293 725,000 BBB/Baa2 Digital Realty Trust LP, 5.875%, 2/1/20 754,333 3,455,000 BBB/Baa3 Goodman Funding Pty, Ltd., 6.375%, 4/15/21 3,515,542 -------------- $ 11,044,542 ----------------------------------------------------------------------------------------------------------- Office Real Estate Investment Trusts -- 0.1% 1,607,000 BBB/Baa2 Mack-Cali Realty LP, 5.125%, 2/15/14 $ 1,669,287 ----------------------------------------------------------------------------------------------------------- Real Estate Operating Companies -- 0.0% 180,000 B-/B3 Forest City Enterprises, 7.625%, 6/1/15 $ 176,850 ----------------------------------------------------------------------------------------------------------- Retail Real Estate Investment Trusts -- 0.2% 2,905,000 BB+/Baa3 Developers Diversified Realty, 7.5%, 4/1/17 $ 3,136,101 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 38 Pioneer Bond Fund | Semiannual Report | 12/31/11 ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Specialized Real Estate Investment Trusts -- 1.6% 4,125,000 BBB-/Baa2 Health Care REIT, Inc., 6.2%, 6/1/16 $ 4,394,235 860,000 BBB-/Baa2 Health Care, Inc., 6.0%, 11/15/13 902,382 2,425,000 BBB-/Baa3 Healthcare Realty Trust, Inc., 6.5%, 1/17/17 2,604,297 5,325,000 BBB-/Baa2 Hospitality Properties Trust, 7.875%, 8/15/14 5,786,150 4,285,000 BBB-/Baa3 Senior Housing Properties Trust, 6.75%, 4/15/20 4,366,912 1,910,000 BBB/Baa2 Ventas Realty LP, 6.5%, 6/1/16 1,969,137 540,000 BBB/Baa2 Ventas Realty LP, 6.75%, 4/1/17 560,032 -------------- $ 20,583,145 -------------- Total Real Estate $ 41,220,120 ----------------------------------------------------------------------------------------------------------- SOFTWARE & SERVICES -- 0.0% Data Processing & Outsourced Services -- 0.0% 447,000 B-/Caa1 First Data Corp., 8.25%, 1/15/21 $ 400,065 -------------- Total Software & Services $ 400,065 ----------------------------------------------------------------------------------------------------------- SEMICONDUCTORS -- 0.3% Semiconductor Equipment -- 0.3% 3,100,000 BBB/Baa1 Klac Instruments Corp., 6.9%, 5/1/18 $ 3,574,774 -------------- Total Semiconductors $ 3,574,774 ----------------------------------------------------------------------------------------------------------- TELECOMMUNICATION SERVICES -- 1.3% Integrated Telecommunication Services -- 0.7% 2,530,000 B/B1 Cincinnati Bell, Inc., 8.25%, 10/15/17 $ 2,542,650 580,000 B/B1 Cincinnati Bell, Inc., 8.375%, 10/15/20 578,550 1,990,000 BB/Baa3 Embarq Corp., 7.082%, 6/1/16 2,157,053 3,950,000 NR/A2 GTP Towers Issuer LLC, 4.436%, 2/15/15 (144A) 4,044,800 -------------- $ 9,323,053 ----------------------------------------------------------------------------------------------------------- Wireless Telecommunication Services -- 0.6% 3,015,000 NR/A2 Crown Castle Towers LLC, 4.883%, 8/15/20 $ 3,081,436 1,625,000 NR/A2 Crown Castle Towers LLC, 6.113%, 1/15/20 1,792,926 3,355,000 NR/A2 GTP Acquisition Partners I LLC, 4.347%, 6/15/16 3,340,721 -------------- $ 8,215,083 -------------- Total Telecommunication Services $ 17,538,136 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 39 Schedule of Investments | 12/31/11 (unaudited) (continued) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- UTILITIES -- 2.7% Electric Utilities -- 1.4% 980,000 A-/Baa1 Commonwealth Edison, 6.15%, 9/15/17 $ 1,163,762 710,020 BBB-/Baa3 Crocket Cogeneration, 5.869%, 3/30/25 (144A) 721,827 3,365,000 A-/A3 Enel Finance International SA, 5.125%, 10/7/19 (144A) 3,006,119 1,167,768 BB/Baa3 FPL Energy America Wind LLC, 6.639%, 6/20/23 (144A) 1,206,223 357,000 B/Ba2 FPL Energy Wind Funding, 6.876%, 6/27/17 (144A) 296,310 1,925,000 BB+/Baa3 Israel Electric Corp., Ltd., 7.25%, 1/15/19 (144A) 1,986,463 610,000 BB+/Baa3 Israel Electric Corp., Ltd., 9.375%, 1/28/20 (144A) 703,436 910,000 BBB/Baa2 Nevada Power Co., 6.5%, 8/1/18 1,097,362 977,421 NR/WR Orcal Geothermal, 6.21%, 12/30/20 (144A) 987,674 2,690,000 BBB-/Baa3 Public Service of New Mexico, 7.95%, 5/15/18 3,144,414 3,550,000 BBB+/A3 West Penn Power Co., 5.95%, 12/15/17 4,193,182 -------------- $ 18,506,772 ----------------------------------------------------------------------------------------------------------- Gas Utilities -- 0.2% 2,402,127 A+/A1 Nakilat, Inc., 6.267%, 12/31/33 (144A) $ 2,577,002 ----------------------------------------------------------------------------------------------------------- Independent Power Producers & Energy Traders -- 0.7% 2,675,000 BB-/Ba3 Intergen NV, 9.0%, 6/30/17 $ 2,815,438 2,105,000 BBB-/Baa3 Kiowa Power Partners LLC, 5.737%, 3/20/21 (144A) 2,171,623 1,016,000 BB/Ba2 NSG Holdings, Inc., 7.75%, 12/15/25 1,041,400 2,499,266 BBB-/Baa3 Panoche Energy Center LLC, 6.88%, 7/31/29 (144A) 2,738,546 -------------- $ 8,767,007 ----------------------------------------------------------------------------------------------------------- Multi-Utilities -- 0.4% 5,055,000 BBB+/Baa2 NY State Gas and Electric, 6.15%, 12/15/17 (144A) $ 5,742,940 369,080 NR/NR Ormat Funding Corp., 8.25%, 12/30/20 345,090 -------------- $ 6,088,030 -------------- Total Utilities $ 35,938,811 ----------------------------------------------------------------------------------------------------------- TOTAL CORPORATE BONDS (Cost $433,604,162) $ 464,781,942 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 40 Pioneer Bond Fund | Semiannual Report | 12/31/11 ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- U.S. GOVERNMENT AGENCY OBLIGATIONS -- 23.5% 2,310,233 AAA/Aaa Federal Home Loan Mortgage Corp., 4.5%, 3/1/20 - 10/1/20 $ 2,460,717 11,278,737 AAA/Aaa Federal Home Loan Mortgage Corp., 5.0%, 10/1/20 - 10/1/38 12,167,936 4,346,496 AAA/Aaa Federal Home Loan Mortgage Corp., 5.5%, 12/1/18 - 11/1/35 4,735,946 10,355,847 AAA/Aaa Federal Home Loan Mortgage Corp., 6.0%, 5/1/17 - 12/1/36 11,471,879 711,744 AAA/Aaa Federal Home Loan Mortgage Corp., 6.5%, 3/1/13 - 4/1/34 810,093 753,461 AAA/Aaa Federal Home Loan Mortgage Corp., 7.0%, 8/1/22 - 11/1/30 822,967 2,849 AAA/Aaa Federal Home Loan Mortgage Corp., 8.0%, 8/1/31 3,251 7,700,000 NR/NR Federal National Mortgage Association REMICS, 5.0%, 3/25/24 - 7/25/33 8,210,606 132,847 AAA/Aaa Federal National Mortgage Association REMICS, 5.69%, 1/25/32 136,912 7,940 NR/NR Federal National Mortgage Association, 10.3%, 4/25/19 9,021 13,440,714 AAA/Aaa Federal National Mortgage Association, 4.0%, 7/1/18 - 1/1/42 14,137,641 25,585,608 AAA/Aaa Federal National Mortgage Association, 4.5%, 11/1/20 - 1/1/42 27,257,856 23,321,499 AAA/Aaa Federal National Mortgage Association, 5.0%, 12/1/17 - 8/1/40 25,249,210 12,020,526 AAA/Aaa Federal National Mortgage Association, 5.5%, 9/1/17 - 6/1/36 13,115,361 10,792,981 AAA/Aaa Federal National Mortgage Association, 6.0%, 6/1/16 - 7/1/38 11,983,415 1,965,973 AAA/Aaa Federal National Mortgage Association, 6.5%, 7/1/29 - 11/1/37 2,223,965 249,972 AAA/Aaa Federal National Mortgage Association, 7.0%, 3/1/12 - 1/1/32 291,320 3,822 AAA/Aaa Federal National Mortgage Association, 7.5%, 8/1/20 - 4/1/30 4,198 29,109 AAA/Aaa Federal National Mortgage Association, 8.0%, 4/1/20 - 5/1/31 34,580 214,359 AAA/Aaa Government National Mortgage Association I, 6.0%, 2/15/29 244,413 69,459 AAA/Aaa Government National Mortgage Association I, 7.0%, 12/15/30 - 3/15/31 81,416 12,097 AAA/Aaa Government National Mortgage Association I, 7.5%, 10/15/29 13,392 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 41 Schedule of Investments | 12/31/11 (unaudited) (continued) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 1,434,887 AAA/Aaa Government National Mortgage Association II, 4.5%, 12/20/34 - 1/20/35 $ 1,573,623 2,357,156 AAA/Aaa Government National Mortgage Association II, 5.5%, 10/20/19 - 11/20/34 2,606,245 75,183 AAA/Aaa Government National Mortgage Association II, 6.5%, 2/20/29 - 4/20/29 85,996 334,659 AAA/Aaa Government National Mortgage Association II, 7.0%, 11/20/28 - 12/20/30 389,921 17,820,972 AAA/Aaa Government National Mortgage Association, 4.5%, 7/15/33 - 9/20/41 19,484,712 2,589,897 AAA/Aaa Government National Mortgage Association, 5.0%, 10/15/18 - 4/15/35 2,865,935 13,332,701 AAA/Aaa Government National Mortgage Association, 5.5%, 10/15/17 - 2/15/37 14,881,818 12,882,211 AAA/Aaa Government National Mortgage Association, 6.0%, 8/15/13 - 10/15/36 14,606,700 5,751,676 AAA/Aaa Government National Mortgage Association, 6.5%, 5/15/26 - 7/15/35 6,659,033 871,750 AAA/Aaa Government National Mortgage Association, 7.0%, 12/15/13 - 5/15/32 1,020,074 142,196 AAA/Aaa Government National Mortgage Association, 7.5%, 2/15/26 - 12/15/31 165,115 9,446 AAA/Aaa Government National Mortgage Association, 7.75%, 2/15/30 11,365 81,429,305 0.68 NR/NR Government National Mortgage Association, Floating Rate Note, 11/16/51 3,728,729 8,750,000 AA+/Aaa U.S. Treasury Bonds, 2.75%, 2/15/19 9,583,298 6,380,000 AA+/Aaa U.S. Treasury Bonds, 3.125%, 5/15/19 7,153,575 2,500,000 AA+/Aaa U.S. Treasury Bonds, 3.625%, 8/15/19 2,895,508 7,620,000 AA+/Aaa U.S. Treasury Bonds, 4.25%, 5/15/39 9,694,073 1,365,000 AA+/Aaa U.S. Treasury Bonds, 4.375%, 11/15/39 1,772,154 5,450,000 AA+/Aaa U.S. Treasury Bonds, 4.375%, 2/15/38 7,045,825 8,435,000 AA+/Aaa U.S. Treasury Bonds, 4.5%, 5/15/38 11,115,744 9,068,000 AA+/Aaa U.S. Treasury Bonds, 4.5%, 8/15/39 11,993,845 4,000,000 AA+/Aaa U.S. Treasury Bonds, 4.625%, 2/15/40 5,395,000 5,100,000 AA+/Aaa U.S. Treasury Bonds, 5.25%, 11/15/28 7,031,625 4,750,000 AA+/Aaa U.S. Treasury Bonds, 6.25%, 8/15/23 6,798,438 8,000,000 AA+/Aaa U.S. Treasury Notes, 2.125%, 8/15/21 8,205,000 2,000,000 AA+/Aaa U.S. Treasury Notes, 4.375%, 5/15/40 2,598,124 7,340,000 AA+/Aaa U.S. Treasury Notes, 4.5%, 2/15/36 9,605,080 4,000,000 AA+/Aaa U.S. Treasury Notes, 5.375%, 2/15/31 5,701,248 The accompanying notes are an integral part of these financial statements. 42 Pioneer Bond Fund | Semiannual Report | 12/31/11 ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- U.S. Government Agency Obligations -- (continued) 840,000 AA+/Aaa U.S. Treasury Notes, 5.5%, 8/15/28 $ 1,185,844 450,000 NR/Aaa U.S. Treasury Notes, 7.875%, 2/15/21 686,707 -------------- $ 312,006,449 ----------------------------------------------------------------------------------------------------------- TOTAL U.S. GOVERNMENT AGENCY OBLIGATIONS (Cost $280,086,743) $ 312,006,449 ----------------------------------------------------------------------------------------------------------- FOREIGN GOVERNMENT BONDS -- 0.1% 625,000 A/A1 Export-Import Bank of Korea, 5.875%, 1/14/15 $ 670,296 -------------- TOTAL FOREIGN GOVERNMENT BONDS (Cost $622,865) $ 670,296 ----------------------------------------------------------------------------------------------------------- MUNICIPAL BONDS -- 6.3% Municipal Government -- 0.3% 1,660,000 AA+/Aa1 State of Washington, 5.0%, 7/1/18 $ 2,035,525 1,400,000 AA+/Aa1 State of Washington, 5.0%, 8/1/39 1,519,812 -------------- $ 3,555,337 ----------------------------------------------------------------------------------------------------------- Municipal Airport -- 0.1% 1,000,000 BBB/Baa2 Indianapolis Airport Authority, 5.1%, 1/15/17 $ 1,126,370 ----------------------------------------------------------------------------------------------------------- Municipal Development -- 0.8% 2,925,000 AA-/Aa3 California Statewide Communities Development Authority, 6.0%, 8/15/42 $ 3,226,802 2,350,000 BBB-/Baa3 Louisiana Local Government Environmental Facilities & Commercial, 6.5%, 11/1/35 2,476,195 2,310,000 BBB/Baa3 Selma Industrial Development Board, 5.8%, 5/1/34 2,382,904 2,560,000 BBB/Baa2 St. John Baptist Parish Louisiana Revenue, 5.125%, 6/1/37 2,556,646 -------------- $ 10,642,547 ----------------------------------------------------------------------------------------------------------- Municipal General -- 0.4% 2,750,000 A+/A1 New Jersey Transport Trust Fund Authority, 5.5%, 6/15/41 $ 3,028,878 2,400,000 AAA/Aa1 New York City Transitional Finance Authority, 5.0%, 11/1/33 2,625,648 -------------- $ 5,654,526 ----------------------------------------------------------------------------------------------------------- Municipal Higher Education -- 3.3% 4,380,000 AA+/Aa2 California State University Revenue, 5.0%, 11/1/39 $ 4,548,236 3,000,000 AAA/Aaa Connecticut State Health & Educational Facility Authority, 5.0%, 7/1/40 3,283,410 4,600,000 AAA/Aaa Connecticut State Health & Education, 5.0%, 7/1/42 5,020,026 The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 43 Schedule of Investments | 12/31/11 (unaudited) (continued) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Municipal Higher Education -- (continued) 2,300,000 AAA/Aaa Houston Texas Higher Education Finance Corp., 4.5%, 11/15/37 $ 2,364,446 1,500,000 AAA/Aaa Houston Texas Higher Education Finance Corp., 5.0%, 5/15/40 1,656,330 1,200,000 AAA/Aaa Massachusetts Development Finance Agency, 5.0%, 10/15/40 1,347,708 6,500,000 AAA/Aaa Massachusetts Health & Educational Facilities Authority, 5.5%, 11/15/36 7,509,385 1,000,000 AAA/Aaa Massachusetts Health & Educational Facilities Authority, 6.0%, 7/1/36 1,176,620 1,425,000 AAA/Aaa Massachusetts State Health & Education, 5.5%, 7/1/32 1,912,421 2,850,000 AAA/Aaa Missouri State Health & Educational Facilities, 5.0%, 11/15/39 3,150,191 2,590,000 AAA/Aaa New York State Dormitory Authority, 5.0%, 10/1/41 2,905,566 2,150,000 AA/Aa1 New York State Dormitory Authority, 5.0%, 7/1/35 2,349,026 3,700,000 AAA/Aaa New York State Dormitory Authority, 5.0%, 7/1/38 4,045,025 1,600,000 AA/Aa1 New York State Dormitory Authority, 5.0%, 7/1/40 1,742,032 800,000 AAA/Aaa Texas A&M University, 5.0%, 7/1/30 942,432 -------------- $ 43,952,854 ----------------------------------------------------------------------------------------------------------- Municipal Medical -- 0.1% 325,000 AA-/A1 Massachusetts Development Finance Agency, 5.25%, 4/1/37 $ 347,575 550,000 AA-/A1 Massachusetts Development Finance Agency, 5.375%, 4/1/41 586,911 -------------- $ 934,486 ----------------------------------------------------------------------------------------------------------- Municipal Pollution -- 0.5% 3,965,000 BBB/NR Brazoria County Environmental, 5.95%, 5/15/33 $ 4,055,680 995,000 BBB+/Baa1 County of Sweetwater Wyoming, 5.6%, 12/1/35 995,915 980,000 BBB/Baa3 Courtland Industrial Development Board, 5.0%, 8/1/27 978,383 1,200,000 B-/Caa2 Pennsylvania Economic Development Financing Authority, 6.0%, 6/1/31 920,304 -------------- $ 6,950,282 ----------------------------------------------------------------------------------------------------------- Municipal Transportation -- 0.1% 1,600,000 AA/Aa2 Harris County Metropolitan Transit Authority, 5.0%, 11/1/41 $ 1,730,320 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 44 Pioneer Bond Fund | Semiannual Report | 12/31/11 ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Municipal Water -- 0.7% 2,800,000 AAA/Aa1 City of Charleston South Carolina, 5.0%, 1/1/41 $ 3,110,520 2,400,000 AAA/Aa1 City of Charleston South Carolina, 5.0%, 1/1/35 2,683,824 1,415,000 AAA/Aaa Greater Chicago Metropolitan Water Reclamation District, 5.0%, 12/1/30 1,602,969 1,200,000 AAA/Aaa Greater Chicago Metropolitan Water Reclamation District, 5.0%, 12/1/32 1,338,000 800,000 AAA/Aa2 Hampton Roads Sanitation District, 5.0%, 4/1/38 853,856 -------------- $ 9,589,169 ----------------------------------------------------------------------------------------------------------- TOTAL MUNICIPAL BONDS (Cost $77,222,608) $ 84,135,891 ----------------------------------------------------------------------------------------------------------- SENIOR FLOATING RATE LOAN INTERESTS -- 7.5%** ENERGY -- 0.4% Integrated Oil & Gas -- 0.2% 3,312,040 4.50 NR/NR Glenn Pool Oil & Gas Trust, Term Loan, 6/1/16 $ 3,303,760 ----------------------------------------------------------------------------------------------------------- Oil & Gas Equipment & Services -- 0.1% 1,295,690 8.50 B+/NR Hudson Products Holdings, Inc., Term Loan, 8/24/15 $ 1,153,164 ----------------------------------------------------------------------------------------------------------- Oil & Gas Refining & Marketing -- 0.1% 1,457,053 4.25 NR/Ba2 Pilot Travel Centers LLC, Initial Tranche B Term Loan, 3/7/18 $ 1,457,736 -------------- Total Energy $ 5,914,660 ----------------------------------------------------------------------------------------------------------- MATERIALS -- 0.5% Diversified Chemical -- 0.1% 199,351 3.12 BBB-/Ba1 Celanese U.S. Holdings LLC, Dollar Extended Term C Loan, 10/31/16 $ 200,473 497,987 7.50 NR/NR Ineos U.S. Finance Corp., Senior Credit Facility Term B2, 12/16/13 509,814 490,508 8.00 NR/NR Ineos U.S. Finance Corp., Senior Credit Facility Term C2, 12/16/14 502,158 -------------- $ 1,212,445 ----------------------------------------------------------------------------------------------------------- Metal & Glass Containers -- 0.0% 463,083 4.50 BB/Ba2 BWAY Holding Co., Replacement B Term Loan, 2/9/18 $ 457,681 42,688 4.50 BB/Ba2 ICL Industrial Containers ULC, Replacement C Term Loan, 2/9/18 42,190 -------------- $ 499,871 ----------------------------------------------------------------------------------------------------------- Paper Packaging -- 0.2% 2,271,754 3.14 BB/Ba2 Graphic Packaging International, Inc., Incremental Term Loan, 5/16/14 $ 2,272,464 -------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 45 Schedule of Investments | 12/31/11 (unaudited) (continued) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Precious Metals & Minerals -- 0.1% 1,348,500 5.25 NR/NR Fairmount Minerals, Ltd., Tranche B Term Loan, 3/1/17 $ 1,348,500 ----------------------------------------------------------------------------------------------------------- Specialty Chemicals -- 0.1% 1,620,000 5.50 NR/NR Chemtura Corp., Term Facility Loan, 8/11/16 $ 1,631,138 262,553 2.88 BB/Ba2 Huntsman International LLC, Extended Term B Loan, 4/19/17 252,050 -------------- $ 1,883,188 -------------- Total Materials $ 7,216,468 ----------------------------------------------------------------------------------------------------------- CAPITAL GOODS -- 0.5% Aerospace & Defense -- 0.5% 987,521 5.43 NR/NR DAE Aviation Holding, Tranche B-1 Term Loan, 7/31/14 $ 961,598 1,650,000 5.75 NR/NR DigitalGlobe, Inc., Term Loan, 9/21/18 1,625,250 947,901 6.27 BB-/Ba3 DynCorp International, Term Loan, 7/7/16 933,919 943,919 5.43 NR/NR Standard Aero, Ltd., Tranche B-2 Term Loan, 7/31/14 919,141 1,589,180 4.50 NR/Ba2 Tasc, Inc., New Tranche B Term Loan, 4/25/15 1,587,194 -------------- $ 6,027,102 -------------- Total Capital Goods $ 6,027,102 ----------------------------------------------------------------------------------------------------------- COMMERCIAL SERVICES & SUPPLIES -- 0.2% Environmental & Facilities Services -- 0.2% 2,590,555 2.28 D/B2 Synagro Technologies, Inc., 1st Lien Term Loan, 4/2/14 $ 2,226,258 -------------- Total Commercial Services & Supplies $ 2,226,258 ----------------------------------------------------------------------------------------------------------- TRANSPORTATION -- 0.1% Air Freight & Couriers -- 0.1% 462,700 5.37 NR/NR Ceva Group Plc, Dollar Tranche B Pre-Funded Term Loan, 8/31/16 $ 426,455 351,403 5.43 NR/NR Ceva Group Plc, EGL Tranche B Term Loan, 8/31/16 318,459 843,532 5.43 NR/B1 Ceva Group Plc, U.S. Tranche B Term Loan, 8/31/16 777,455 -------------- $ 1,522,369 -------------- Total Transportation $ 1,522,369 ----------------------------------------------------------------------------------------------------------- AUTOMOBILES & COMPONENTS -- 0.9% Auto Parts & Equipment -- 0.3% 1,037,600 2.78 B+/B2 Allison Transmission, Term Loan, 8/7/14 $ 1,015,366 1,607,026 3.50 BBB-/Baa3 Delphi Automotive LLP, Tranche B Term Loan, 3/31/17 1,604,348 542,747 2.22 NR/NR Federal Mogul Corp., Tranche C Term Loan, 12/28/15 503,624 The accompanying notes are an integral part of these financial statements. 46 Pioneer Bond Fund | Semiannual Report | 12/31/11 ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Auto Parts & Equipment -- (continued) 1,063,784 2.21 NR/NR Federal Mogul Corp., Tranche B Term Loan, 12/29/14 $ 987,103 721,018 4.25 NR/NR Pinafore LLC, Term B-1 Loan, 9/21/16 719,892 -------------- $ 4,830,333 ----------------------------------------------------------------------------------------------------------- Automobile Manufacturers -- 0.3% 3,895,425 6.00 NR/NR Chrysler Group LLC, Tranche B Term Loan, 4/28/17 $ 3,695,784 ----------------------------------------------------------------------------------------------------------- Tires & Rubber -- 0.3% 4,190,000 1.93 BB/Ba1 Goodyear Tire & Rubber Co., 2nd Lien Term Loan, 4/30/14 $ 4,053,825 -------------- Total Automobiles & Components $ 12,579,942 ----------------------------------------------------------------------------------------------------------- CONSUMER SERVICES -- 0.1% Restaurants -- 0.1% 1,019,738 4.50 BB+/Ba2 Burger King Holdings, Inc., Tranche B Term Loan, 10/30/16 $ 1,004,229 ----------------------------------------------------------------------------------------------------------- Specialized Consumer Services -- 0.0% 329,063 7.00 NR/NR Wash Multifamily Laundry, Term Loan, 8/28/14 $ 326,801 -------------- Total Consumer Services $ 1,331,030 ----------------------------------------------------------------------------------------------------------- MEDIA -- 1.0% Advertising -- 0.1% 1,098,083 5.00 BB/Ba3 Affinion Group, Inc., Tranche B Term Loan, 10/9/16 $ 975,921 ----------------------------------------------------------------------------------------------------------- Broadcasting -- 0.2% 2,884,687 4.55 B/Baa2 Univision Communications, Inc., Extended 1st Lien Term Loan, 3/29/17 $ 2,582,698 ----------------------------------------------------------------------------------------------------------- Cable & Satellite -- 0.3% 4,057,152 3.83 NR/NR Charter Communications Operations, Term C Loan, 9/8/16 $ 3,977,277 617,684 2.79 CCC/B2 WideOpenWest LLC, 1st Lien Term Loan, 6/30/14 579,593 -------------- $ 4,556,870 ----------------------------------------------------------------------------------------------------------- Movies & Entertainment -- 0.2% 1,057,125 5.25 NR/NR Cinedigm Digital Funding, Term Loan, 4/29/16 $ 1,020,126 1,670,250 4.50 B+/NR Live Nation Entertainment, Term B Loan, 10/20/16 1,664,669 -------------- $ 2,684,795 ----------------------------------------------------------------------------------------------------------- Publishing -- 0.2% 2,370,090 4.50 NR/NR Interactive Data Corp., Term B Loan, 1/31/18 $ 2,350,339 -------------- Total Media $ 13,150,623 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 47 Schedule of Investments | 12/31/11 (unaudited) (continued) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- RETAILING -- 0.1% Automotive Retail -- 0.1% 1,409,350 4.00 NR/NR Autotrader.com, Inc., Tranche B-1 Term Loan, 12/15/16 $ 1,410,525 -------------- Total Retailing $ 1,410,525 ----------------------------------------------------------------------------------------------------------- FOOD & DRUG RETAILING -- 0.0% Food Retail -- 0.0% 352,401 2.80 BB-/Ba3 Pinnacle Foods Group, Inc., Term Loan, 4/2/14 $ 344,580 -------------- Total Food & Drug Retailing $ 344,580 ----------------------------------------------------------------------------------------------------------- FOOD, BEVERAGE & TOBACCO -- 0.0% Packaged Foods & Meats -- 0.0% 307,500 4.50 BB/Ba2 B&G Foods, Inc., Tranche B Term Loan, 10/28/18 $ 308,749 -------------- Total Food, Beverage & Tobacco $ 308,749 ----------------------------------------------------------------------------------------------------------- HOUSEHOLD & PERSONAL PRODUCTS -- 0.1% Personal Products -- 0.1% 861,429 4.25 BB-/Ba1 NBTY, Inc., Term B-1 Loan, 10/1/17 $ 854,322 -------------- Total Household & Personal Products $ 854,322 ----------------------------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 1.4% Health Care Facilities -- 0.8% 1,630,974 6.50 B+/B1 Ardent Medical Services, Term Loan, 9/15/15 $ 1,620,780 110,226 2.55 BB-/Ba3 CHS/Community Health Systems, Inc., Non-Extended Delayed Draw Term Loan, 7/25/14 107,215 2,146,641 2.76 BB-/Ba3 CHS/Community Health Systems, Inc., Non-Extended Term Loan, 7/25/14 2,087,992 1,793,613 3.83 BB+/Ba2 HCA, Inc., Tranche B-2 Term Loan, 3/17/17 1,706,175 747,900 3.55 BB+/Ba2 HCA, Inc., Tranche B-3 Term Loan, 5/1/18 708,791 1,680,000 4.50 BB-/Ba3 Health Management Associates, Inc., Term B Loan, 11/1/18 1,674,112 1,869,344 3.75 NR/NR Universal Health Services, Inc., Tranche B Term Loan 2011, 11/30/16 1,868,633 -------------- $ 9,773,698 ----------------------------------------------------------------------------------------------------------- Health Care Services -- 0.2% 2,743,532 2.55 NR/NR Catalent Pharma Solutions, Inc., Dollar Term Loan, 4/10/14 $ 2,646,366 396,000 4.50 BB/Ba1 DaVita, Inc., Tranche B Term Loan, 10/20/16 396,198 -------------- $ 3,042,564 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 48 Pioneer Bond Fund | Semiannual Report | 12/31/11 ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Health Care Supplies -- 0.4% 540,346 3.55 BB-/B1 Bausch & Lomb, Inc., Delayed Draw Term Loan, 4/24/15 $ 529,201 2,214,237 3.83 BB-/B1 Bausch & Lomb, Inc., Parent Term Loan, 4/24/15 2,168,569 2,199,488 7.25 NR/NR Immucor, Inc., Term B Loan, 7/2/18 2,215,066 -------------- $ 4,912,836 ----------------------------------------------------------------------------------------------------------- Health Care Technology -- 0.0% 465,396 4.50 NR/NR IMS Health, Inc., Tranche B Dollar Term Loan, 8/31/17 $ 464,814 -------------- Total Health Care Equipment & Services $ 18,193,912 ----------------------------------------------------------------------------------------------------------- PHARMACEUTICALS & BIOTECHNOLOGY -- 0.2% Biotechnology -- 0.1% 1,024,850 6.00 NR/NR Grifols, Inc., U.S. Tranche B Term Loan, 6/4/16 $ 1,023,889 ----------------------------------------------------------------------------------------------------------- Pharmaceuticals -- 0.1% 1,105,016 4.00 NR/NR Endo Pharmaceuticals Holdings, Term B Loan, 4/14/18 $ 1,106,950 -------------- Total Pharmaceuticals & Biotechnology $ 2,130,839 ----------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 0.3% Diversified Financial Services -- 0.2% 1,741,250 4.00 NR/Baa3 RPI Finance Trust, 6.75 Year Term Loan, 4/13/18 $ 1,732,000 1,010,000 5.25 NR/NR Ship Luxco 3, Facility B2A Term Loan, 8/6/17 999,900 -------------- $ 2,731,900 ----------------------------------------------------------------------------------------------------------- Specialized Finance -- 0.1% 843,077 3.75 BBB-/Ba2 MSCI, Inc., Term B-1 Loan, 3/14/17 $ 849,927 -------------- Total Diversified Financials $ 3,581,827 ----------------------------------------------------------------------------------------------------------- INSURANCE -- 0.1% Insurance Brokers -- 0.1% 325,388 3.08 B/NR HUB International Holdings, Delayed Draw Term Loan, 6/13/14 $ 312,372 1,447,508 3.08 B/NR HUB International Holdings, Initial Term Loan, 6/13/14 1,389,607 -------------- $ 1,701,979 -------------- Total Insurance $ 1,701,979 ----------------------------------------------------------------------------------------------------------- SOFTWARE & SERVICES -- 0.3% Application Software -- 0.0% 382,082 3.30 BB+/Baa3 Nuance Communications, Inc., Term C Loan, 3/31/16 $ 380,411 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 49 Schedule of Investments | 12/31/11 (unaudited) (continued) ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- Data Processing & Outsourced Services -- 0.1% 865,714 3.25 BBB-/Ba1 Fidelity National, Inc., Term B Loan, 7/18/16 $ 867,658 ----------------------------------------------------------------------------------------------------------- IT Consulting & Other Services -- 0.2% 2,329,542 2.03 BB/Ba3 Sungard Data Systems, Inc., Tranche A U.S. Term Loan, 2/28/14 $ 2,276,157 ----------------------------------------------------------------------------------------------------------- Systems Software -- 0.0% 251,271 3.75 BB-/Ba2 Reynolds & Reynolds Co., Tranche B Term Loan, 3/9/18 $ 250,392 -------------- Total Software & Services $ 3,774,618 ----------------------------------------------------------------------------------------------------------- TECHNOLOGY HARDWARE & EQUIPMENT -- 0.4% Communications Equipment -- 0.1% 942,875 5.00 BB/Ba2 CommScope, Inc., Term Loan, 1/3/18 $ 938,947 ----------------------------------------------------------------------------------------------------------- Electronic Components -- 0.3% 2,683,760 2.52 BB+/Ba1 Flextronics Semiconductor, A Closing Date Loan, 10/1/14 $ 2,634,398 497,244 2.55 BB+/Ba1 Flextronics Semiconductor, A-1-A Delayed Draw Loan, 10/1/14 491,339 316,483 2.55 BB+/Ba1 Flextronics Semiconductor, A-2 Delayed Draw Loan, 10/1/14 312,725 369,231 2.52 BB+/Ba1 Flextronics Semiconductor, A-3 Delayed Draw Loan, 10/1/14 364,846 -------------- $ 3,803,308 -------------- Total Technology Hardware & Equipment $ 4,742,255 ----------------------------------------------------------------------------------------------------------- SEMICONDUCTORS -- 0.3% Semiconductor Equipment -- 0.2% 3,781,000 4.25 B+/Ba3 Aeroflex, Inc., Tranche B Term Loan, 4/25/18 $ 3,573,045 ----------------------------------------------------------------------------------------------------------- Semiconductors -- 0.1% 990,019 5.75 NR/NR Microsemi Corp., Term Loan B, 2/2/18 $ 992,494 -------------- Total Semiconductors $ 4,565,539 ----------------------------------------------------------------------------------------------------------- TELECOMMUNICATION SERVICES -- 0.3% Integrated Telecommunication Services -- 0.2% 2,930,480 3.30 NR/NR Telesat Canada, Inc., U.S. Term I Loan, 10/31/14 $ 2,907,281 251,736 3.30 NR/NR Telesat Canada, Inc., U.S. Term II Loan, 10/31/14 249,743 -------------- $ 3,157,024 ----------------------------------------------------------------------------------------------------------- Wireless Telecommunication Services -- 0.1% 1,180,000 3.39 B/B3 Intelsat Jackson Holdings, Ltd., Unsecured Term Loan, 2/1/14 $ 1,126,310 -------------- Total Telecommunication Services $ 4,283,334 ----------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 50 Pioneer Bond Fund | Semiannual Report | 12/31/11 ----------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ----------------------------------------------------------------------------------------------------------- UTILITIES -- 0.3% Electric Utilities -- 0.2% 4,044,646 4.78 BBB-/Ba1 Texas Competitive Electric Holdings Co. LLC, 2017 Extending Term Loan, 10/10/17 $ 2,575,091 ----------------------------------------------------------------------------------------------------------- Independent Power Producers & Energy Traders -- 0.1% 1,363,150 4.00 BB+/Baa3 NRG Energy, Inc., Term Loan, 5/5/18 $ 1,362,298 -------------- Total Utilities $ 3,937,389 ----------------------------------------------------------------------------------------------------------- TOTAL SENIOR FLOATING RATE LOAN INTERESTS (Cost $101,150,984) $ 99,798,320 ----------------------------------------------------------------------------------------------------------- TEMPORARY CASH INVESTMENTS -- 4.7% Repurchase Agreement -- 4.7% 62,600,000 NR/Aaa JPMorgan, Inc., 0.03%, dated 12/30/11, repurchase price of $62,600,000 plus accrued interest on 1/3/12 collateralized by $63,925,588 Federal National Mortgage Association (ARM), 1.356-6.409%, 10/1/18 - 11/1/41 $ 62,600,000 ----------------------------------------------------------------------------------------------------------- TOTAL TEMPORARY CASH INVESTMENTS (Cost $62,600,000) $ 62,600,000 ----------------------------------------------------------------------------------------------------------- TOTAL INVESTMENT IN SECURITIES -- 101.5% (Cost $1,299,815,892) (a) $1,349,147,598 ----------------------------------------------------------------------------------------------------------- OTHER ASSETS AND LIABILITIES -- (1.5)% $ (20,115,602) ----------------------------------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $1,329,031,996 =========================================================================================================== NR Not rated by either S&P or Moody's. WR Withdrawn rating. (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, 2011, the value of these securities amounted to $55,146,570 or 4.1% 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. The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 51 Schedule of Investments | 12/31/11 (unaudited) (continued) (a) At December 31, 2011, the net unrealized gain on investments based on cost for federal income tax purposes of $1,297,957,962 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $88,294,947 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (37,105,311) ----------- Net unrealized gain $51,189,636 =========== (b) Debt obligation with a variable interest rate. Rate shown is rate at end of period. (c) Security is valued using fair value methods (other than prices supplied by independent pricing services). See Notes to Financial Statements -- Note 1A. Purchases and sales of securities (excluding temporary cash investments) for the six months ended December 31, 2011 were as follows: Purchases Sales Long-Term U.S. Government Securities $53,905,931 $35,434,362 Other Long-Term Securities $93,345,704 $96,179,534 Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. Level 1 -- quoted prices in active markets for identical securities Level 2 -- other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.) Level 3 -- significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) Generally, equity securities are categorized as Level 1, fixed income securities and senior loans as Level 2 and securities valued using fair value methods (other than prices supplied by independent pricing services) as Level 3. See Notes to Financial Statements -- Note 1A. The accompanying notes are an integral part of these financial statements. 52 Pioneer Bond Fund | Semiannual Report | 12/31/11 The following is a summary of the inputs used as of December 31, 2011, in valuing the Fund's assets: -------------------------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total -------------------------------------------------------------------------------------------------- Convertible Corporate Bonds $ -- $ 8,098,361 $ -- $ 8,098,361 Preferred Stocks 12,656,776 6,946,600 -- 19,603,376 Asset Backed Securities -- 86,934,964 -- 86,934,964 Collateralized Mortgage Obligations -- 210,352,431 165,568 210,517,999 Corporate Bonds -- 464,781,942 -- 464,781,942 U.S. Government Agency Obligations -- 312,006,449 -- 312,006,449 Foreign Government Bonds -- 670,296 -- 670,296 Municipal Bonds -- 84,135,891 -- 84,135,891 Senior Floating Rate Loan Interests -- 99,798,320 -- 99,798,320 Temporary Cash Investments -- 62,600,000 -- 62,600,000 -------------------------------------------------------------------------------------------------- Total $12,656,776 $1,336,325,254 $165,568 $1,349,147,598 ================================================================================================== Other Financial Instruments* $ (706,982) $ -- $ -- $ (706,982) ================================================================================================== * Other financial instruments include futures contracts. Following is a reconciliation of assets using significant unobservable inputs (Level 3): -------------------------------------------------------------------------------- Collateralized Mortgage Obligations -------------------------------------------------------------------------------- Balance as of 6/30/11 $ 232,842 Realized gain (loss)1 -- Change in unrealized appreciation (depreciation)2 (67,274) Net purchases (sales) -- Transfers in and out of Level 3** -- -------------------------------------------------------------------------------- Balance as of 12/31/11 $ 165,568 ================================================================================ 1 Realized gain (loss) on these securities is included in the net realized gain (loss) on 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. ** Transfers are calculated on the beginning of period values. The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 53 Statement of Assets and Liabilities | 12/31/11 (unaudited) ASSETS: Investment in securities (cost $1,299,815,892) $1,349,147,598 Cash 6,721,588 Futures collateral 1,073,595 Receivables -- Investment securities sold 9,946 Fund shares sold 4,241,740 Interest 11,650,548 Due from Pioneer Investment Management, Inc. 30,488 Other 112,854 ---------------------------------------------------------------------------------------- Total assets $1,372,988,357 ---------------------------------------------------------------------------------------- LIABILITIES: Payables -- Investment securities purchased $ 37,707,012 Fund shares repurchased 2,749,571 Dividends 2,915,868 Variation margin 166,298 Due to affiliates 307,674 Accrued expenses 109,938 ---------------------------------------------------------------------------------------- Total liabilities $ 43,956,361 ---------------------------------------------------------------------------------------- NET ASSETS: Paid-in capital $1,302,630,347 Distributions in excess of net investment income (2,609,474) Accumulated net realized loss on investments and futures contracts (19,613,601) Net unrealized gain on investments 49,331,706 Net unrealized loss on futures contracts (706,982) ---------------------------------------------------------------------------------------- Total net assets $1,329,031,996 ======================================================================================== NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Class A (based on $423,609,993/44,427,954 shares) $ 9.53 Class B (based on $15,917,051/1,679,356 shares) $ 9.48 Class C (based on $92,233,624/9,778,719 shares) $ 9.43 Class R (based on $20,060,413/2,085,367 shares) $ 9.62 Class Y (based on $775,422,820/82,049,815 shares) $ 9.45 Class Z (based on $1,788,095/187,194 shares) $ 9.55 MAXIMUM OFFERING PRICE: Class A ($9.53 / 95.5%) $ 9.98 ======================================================================================== The accompanying notes are an integral part of these financial statements. 54 Pioneer Bond Fund | Semiannual Report | 12/31/11 Statement of Operations (unaudited) For the Six Months Ended 12/31/11 INVESTMENT INCOME: Interest $ 33,239,373 Dividends 519,189 Income from securities loaned, net 34,712 ----------------------------------------------------------------------------------------- Total investment income $33,793,274 ----------------------------------------------------------------------------------------- EXPENSES: Management fees $ 3,193,672 Transfer agent fees Class A 166,457 Class B 29,230 Class C 25,102 Class R 3,790 Class Y 43,651 Class Z 256 Distribution fees Class A 549,984 Class B 86,590 Class C 439,389 Class R 48,336 Shareholder communications expense 653,261 Administrative reimbursements 189,596 Custodian fees 24,994 Registration fees 90,261 Professional fees 47,865 Printing expense 16,192 Fees and expenses of nonaffiliated Trustees 19,685 Miscellaneous 51,755 ----------------------------------------------------------------------------------------- Total expenses $ 5,680,066 Less fees waived and expenses reimbursed by Pioneer Investment Management, Inc. (402,369) ----------------------------------------------------------------------------------------- Net expenses $ 5,277,697 ----------------------------------------------------------------------------------------- Net investment income $28,515,577 ----------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS AND FUTURES CONTRACTS: Net realized gain (loss) on: Investments $ (1,293,512) Class action 18,311 Futures contracts (287,181) $(1,562,382) ----------------------------------------------------------------------------------------- Change in net unrealized loss on: Investments $ (4,058,770) Futures contracts (729,063) $(4,787,833) ----------------------------------------------------------------------------------------- Net loss on investments and futures contracts $(6,350,215) ----------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $22,165,362 ========================================================================================= The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 55 Statement of Changes in Net Assets For the Six Months Ended 12/31/11 and the Year Ended 6/30/11, respectively ------------------------------------------------------------------------------------------------------- Six Months Ended 12/31/11 Year Ended (unaudited) 6/30/11 FROM OPERATIONS: Net investment income $ 28,515,577 $ 58,916,585 Net realized gain (loss) on investments and futures contracts (1,562,382) 19,978,053 Change in net unrealized gain (loss) on investments and futures contracts (4,787,833) 6,496,838 ------------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 22,165,362 $ 85,391,476 ------------------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Net investment income: Class A ($0.23 and $0.44 per share, respectively) $ (10,464,579) $ (19,115,565) Class B ($0.18 and $0.34 per share, respectively) (320,898) (814,135) Class C ($0.19 and $0.35 per share, respectively) (1,733,658) (3,061,924) Class R ($0.21 and $0.41 per share, respectively) (422,827) (841,089) Class Y ($0.24 and $0.46 per share, respectively) (18,736,707) (33,941,983) Class Z ($0.24 and $0.46 per share, respectively) (22,373) (34,116) Net realized gain: Class A ($0.05 and $0.00 per share, respectively) (2,175,261) -- Class B ($0.05 and $0.00 per share, respectively) (84,708) -- Class C ($0.05 and $0.00 per share, respectively) (468,609) -- Class R ($0.05 and $0.00 per share, respectively) (100,096) -- Class Y ($0.05 and $0.00 per share, respectively) (4,001,897) -- Class Z ($0.05 and $0.00 per share, respectively) (4,956) -- ------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (38,536,569) $ (57,808,812) ------------------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sale of shares $ 277,578,708 $ 502,805,760 Reinvestment of distributions 22,960,193 31,046,676 Cost of shares repurchased (296,157,960) (483,127,000) ------------------------------------------------------------------------------------------------------- Net increase in net assets resulting from Fund share transactions $ 4,380,941 $ 50,725,436 ------------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets $ (11,990,266) $ 78,308,100 NET ASSETS: Beginning of period 1,341,022,262 1,262,714,162 ------------------------------------------------------------------------------------------------------- End of period $1,329,031,996 $1,341,022,262 ======================================================================================================= Undistributed (distributions in excess of) net investment income $ (2,609,474) $ 575,991 ======================================================================================================= The accompanying notes are an integral part of these financial statements. 56 Pioneer Bond Fund | Semiannual Report | 12/31/11 ---------------------------------------------------------------------------------------------- 12/11 Shares 12/11 Amount 6/11 Shares 6/11 Amount (unaudited) (unaudited) ---------------------------------------------------------------------------------------------- Class A Shares sold 9,747,488 $ 94,149,457 27,278,290 $263,115,680 Reinvestment of distributions 1,048,743 10,066,164 1,589,792 15,316,927 Less shares repurchased (18,236,819) (176,573,084) (21,554,132) (207,161,586) ---------------------------------------------------------------------------------------------- Net increase (decrease) (7,440,588) $(72,357,463) 7,313,950 $ 71,271,021 ============================================================================================== Class B Shares sold 178,835 $ 1,720,287 222,239 $ 2,121,453 Reinvestment of distributions 38,863 370,945 77,652 743,038 Less shares repurchased (462,589) (4,438,871) (1,289,045) (12,303,562) ---------------------------------------------------------------------------------------------- Net decrease (244,890) $ (2,347,639) (989,154) $ (9,439,071) ============================================================================================== Class C Shares sold 2,227,510 $ 21,244,446 2,737,693 $ 26,073,411 Reinvestment of distributions 158,083 1,500,025 213,686 2,036,474 Less shares repurchased (1,284,782) (12,230,557) (3,040,932) (28,890,255) ---------------------------------------------------------------------------------------------- Net increase (decrease) 1,100,811 $ 10,513,914 (89,553) $ (780,370) ============================================================================================== Class R Shares sold 674,521 $ 6,560,245 1,314,257 $ 12,751,688 Reinvestment of distributions 43,610 422,049 63,853 620,735 Less shares repurchased (737,919) (7,198,832) (1,182,197) (11,480,126) ---------------------------------------------------------------------------------------------- Net increase (decrease) (19,788) $ (216,538) 195,913 $ 1,892,297 ============================================================================================== Class Y Shares sold 15,991,190 $152,860,788 20,798,206 $198,381,546 Reinvestment of distributions 1,112,026 10,574,149 1,288,384 12,308,045 Less shares repurchased (9,986,762) (95,658,963) (23,425,218) (222,959,013) ---------------------------------------------------------------------------------------------- Net increase (decrease) 7,116,454 $ 67,775,974 (1,338,628) $(12,269,422) ============================================================================================== Class Z Shares sold 109,016 $ 1,043,485 37,285 $ 361,982 Reinvestment of distributions 2,794 26,861 2,220 21,457 Less shares repurchased (5,973) (57,653) (34,264) (332,458) ---------------------------------------------------------------------------------------------- Net increase 105,837 $ 1,012,693 5,241 $ 50,981 ============================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Bond Fund | Semiannual Report | 12/31/11 57 Financial Highlights ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 12/31/11 Ended Ended Ended Ended Ended (unaudited) 6/30/11 6/30/10 6/30/09 6/30/08 6/30/07 ------------------------------------------------------------------------------------------------------------------------------------ Class A Net asset value, beginning of period $ 9.66 $ 9.44 $ 8.63 $ 9.10 $ 8.95 $ 8.89 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.21 $ 0.45 $ 0.45 $ 0.50 $ 0.43 $ 0.40 Net realized and unrealized gain (loss) on investments (0.06) 0.21 0.80 (0.31) 0.16 0.07 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.15 $ 0.66 $ 1.25 $ 0.19 $ 0.59 $ 0.47 Distributions to shareowners: Net investment income (0.23) (0.44) (0.44) (0.55) (0.44) (0.41) Net realized gain (0.05) -- -- (0.11) -- -- ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (0.13) $ 0.22 $ 0.81 $ (0.47) $ 0.15 $ 0.06 ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 9.53 $ 9.66 $ 9.44 $ 8.63 $ 9.10 $ 8.95 ==================================================================================================================================== Total return* 1.59% 7.08% 14.71% 2.65% 6.64% 5.31% Ratio of net expenses to average net assets+ 0.85%** 0.85% 0.85% 0.89%(a) 1.00% 1.00% Ratio of net investment income to average net assets+ 4.32%** 4.63% 4.86% 5.88% 4.60% 4.48% Portfolio turnover rate 21%** 36% 41% 34% 73% 31% Net assets, end of period (in thousands) $423,610 $500,905 $420,706 $320,036 $265,959 $284,592 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.02%** 1.06% 1.07% 1.09% 1.04% 1.00% Net investment income 4.15%** 4.42% 4.64% 5.68% 4.56% 4.48% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.85%** 0.85% 0.85% 0.89%(a) 1.00% 1.00% Net investment income 4.32%** 4.63% 4.86% 5.88% 4.60% 4.48% ==================================================================================================================================== * 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. 58 Pioneer Bond Fund | Semiannual Report | 12/31/11 ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 12/31/11 Ended Ended Ended Ended Ended (unaudited) 6/30/11 6/30/10 6/30/09 6/30/08 6/30/07 ------------------------------------------------------------------------------------------------------------------------------------ Class B Net asset value, beginning of period $ 9.60 $ 9.38 $ 8.58 $ 9.05 $ 8.90 $ 8.85 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.16 $ 0.35 $ 0.35 $ 0.42 $ 0.34 $ 0.33 Net realized and unrealized gain (loss) on investments (0.05) 0.21 0.79 (0.31) 0.16 0.05 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.11 $ 0.56 $ 1.14 $ 0.11 $ 0.50 $ 0.38 Distributions to shareowners: Net investment income (0.18) (0.34) (0.34) (0.47) (0.35) (0.33) Net realized gain (0.05) -- -- (0.11) -- -- ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (0.12) $ 0.22 $ 0.80 $ (0.47) $ 0.15 $ 0.05 ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 9.48 $ 9.60 $ 9.38 $ 8.58 $ 9.05 $ 8.90 ==================================================================================================================================== Total return* 1.16% 5.99% 13.47% 1.62% 5.70% 4.26% Ratio of net expenses to average net assets+ 1.90%** 1.90% 1.90% 1.90% 1.90% 1.92% Ratio of net investment income to average net assets+ 3.29%** 3.59% 3.89% 4.90% 3.72% 3.55% Portfolio turnover rate 21%** 36% 41% 34% 73% 31% Net assets, end of period (in thousands) $ 15,917 $ 18,474 $27,342 $ 31,738 $ 34,106 $ 36,366 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.99%** 1.95% 1.98% 1.99% 1.90% 2.02% Net investment income 3.20%** 3.54% 3.81% 4.81% 3.72% 3.45% 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% 1.90% 1.89% 1.90% Net investment income 3.29%** 3.59% 3.89% 4.90% 3.73% 3.57% ==================================================================================================================================== * 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 | 12/31/11 59 Financial Highlights (continued) ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 12/31/11 Ended Ended Ended Ended Ended (unaudited) 6/30/11 6/30/10 6/30/09 6/30/08 6/30/07 ------------------------------------------------------------------------------------------------------------------------------------ Class C Net asset value, beginning of period $ 9.55 $ 9.34 $ 8.54 $ 9.02 $ 8.87 $ 8.81 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.17 $ 0.36 $ 0.37 $ 0.42 $ 0.35 $ 0.33 Net realized and unrealized gain (loss) on investments (0.05) 0.20 0.78 (0.31) 0.16 0.06 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.12 $ 0.56 $ 1.15 $ 0.11 $ 0.51 $ 0.39 Distributions to shareowners: Net investment income (0.19) (0.35) (0.35) (0.48) (0.36) (0.33) Net realized gain (0.05) -- -- (0.11) -- -- ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (0.12) $ 0.21 $ 0.80 $ (0.48) $ 0.15 $ 0.06 ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 9.43 $ 9.55 $ 9.34 $ 8.54 $ 9.02 $ 8.87 ==================================================================================================================================== Total return* 1.25% 6.06% 13.63% 1.62% 5.80% 4.39% Ratio of net expenses to average net assets+ 1.73%** 1.73% 1.79% 1.83% 1.82% 1.85% Ratio of net investment income to average net assets+ 3.45%** 3.75% 3.91% 4.93% 3.79% 3.62% Portfolio turnover rate 21%** 36% 41% 34% 73% 31% Net assets, end of period (in thousands) $ 92,234 $ 82,915 $ 81,892 $ 53,045 $ 35,784 $ 30,934 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.73%** 1.73% 1.79% 1.83% 1.82% 1.85% Net investment income 3.45%** 3.75% 3.91% 4.93% 3.79% 3.62% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.73%** 1.73% 1.79% 1.83% 1.82% 1.84% Net investment income 3.45%** 3.75% 3.91% 4.93% 3.79% 3.63% ==================================================================================================================================== * 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. 60 Pioneer Bond Fund | Semiannual Report | 12/31/11 ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 12/31/11 Ended Ended Ended Ended Ended (unaudited) 6/30/11 6/30/10 6/30/09 6/30/08 6/30/07 ------------------------------------------------------------------------------------------------------------------------------------ Class R Net asset value, beginning of period $ 9.74 $ 9.52 $ 8.71 $ 9.18 $ 9.05 $ 8.99 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.19 $ 0.41 $ 0.42 $ 0.48 $ 0.40 $ 0.39 Net realized and unrealized gain (loss) on investments (0.05) 0.22 0.80 (0.31) 0.15 0.06 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.15 $ 0.63 $ 1.22 $ 0.17 $ 0.55 $ 0.45 Distributions to shareowners: Net investment income (0.21) (0.41) (0.41) (0.53) (0.42) (0.39) Net realized gain (0.05) -- -- (0.11) -- -- ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (0.11) $ 0.22 $ 0.81 $ (0.47) $ 0.13 $ 0.06 ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 9.63 $ 9.74 $ 9.52 $ 8.71 $ 9.18 $ 9.05 ==================================================================================================================================== Total return* 1.49% 6.67% 14.18% 2.35% 6.15% 5.04% Ratio of net expenses to average net assets+ 1.25%** 1.24% 1.25% 1.25% 1.25% 1.25% Ratio of net investment income to average net assets+ 3.92%** 4.25% 4.50% 5.53% 4.35% 4.24% Portfolio turnover rate 21%** 36% 41% 34% 73% 31% Net assets, end of period (in thousands) $ 20,060 $ 20,508 $ 18,186 $ 15,404 $ 11,263 $ 6,511 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.33%** 1.24% 1.26% 1.30% 1.31% 1.44% Net investment income 3.84%** 4.25% 4.49% 5.48% 4.30% 4.05% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.25%** 1.24% 1.25% 1.25% 1.25% 1.25% Net investment income 3.92%** 4.25% 4.50% 5.53% 4.35% 4.24% ==================================================================================================================================== * 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 | 12/31/11 61 Financial Highlights (continued) ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 12/31/11 Ended Ended Ended Ended Ended (unaudited) 6/30/11 6/30/10 6/30/09 6/30/08 6/30/07 ------------------------------------------------------------------------------------------------------------------------------------ Class Y Net asset value, beginning of period $ 9.57 $ 9.36 $ 8.55 $ 9.02 $ 8.88 $ 8.83 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.22 $ 0.47 $ 0.47 $ 0.53 $ 0.45 $ 0.44 Net realized and unrealized gain (loss) on investments (0.05) 0.20 0.79 (0.31) 0.16 0.06 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.17 $ 0.67 $ 1.26 $ 0.22 $ 0.61 $ 0.50 Distributions to shareowners: Net investment income (0.24) (0.46) (0.45) (0.58) (0.47) (0.45) Net realized gain (0.05) -- -- (0.11) -- -- ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (0.12) $ 0.21 $ 0.81 $ (0.47) $ 0.14 $ 0.05 ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 9.45 $ 9.57 $ 9.36 $ 8.55 $ 9.02 $ 8.88 ==================================================================================================================================== Total return* 1.81% 7.25% 15.06% 2.95% 6.91% 5.65% Ratio of net expenses to average net assets+ 0.64%** 0.61% 0.61% 0.63% 0.59% 0.57% Ratio of net investment income to average net assets+ 4.54%** 4.88% 5.13% 6.10% 5.02% 4.89% Portfolio turnover rate 21%** 36% 41% 34% 73% 31% Net assets, end of period (in thousands) $775,423 $717,433 $713,869 $589,661 $710,219 $613,523 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.64%** 0.61% 0.61% 0.64% 0.61% 0.57% Net investment income 4.54%** 4.88% 5.13% 6.09% 5.00% 4.89% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.64%** 0.61% 0.61% 0.63% 0.59% 0.57% Net investment income 4.54%** 4.88% 5.13% 6.10% 5.02% 4.89% ==================================================================================================================================== * 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. 62 Pioneer Bond Fund | Semiannual Report | 12/31/11 -------------------------------------------------------------------------------------------------------------------------------- Six Months Ended Year Year Year 12/31/11 Ended Ended Ended 7/6/07 (a) (unaudited) 6/30/11 6/30/10 6/30/09 to 6/30/08 -------------------------------------------------------------------------------------------------------------------------------- Class Z Net asset value, beginning of period $ 9.68 $ 9.46 $ 8.67 $ 9.10 $ 8.89 -------------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income $ 0.23 $ 0.47 $ 0.48 $ 0.54 $ 0.45 Net realized and unrealized gain (loss) on investments (0.07) 0.21 0.77 (0.28) 0.22 -------------------------------------------------------------------------------------------------------------------------------- Net increase from investment operations $ 0.16 $ 0.68 $ 1.25 $ 0.26 $ 0.67 Distributions to shareowners: Net investment income (0.24) (0.46) (0.46) (0.58) (0.46) Net realized gain (0.05) -- -- (0.11) -- -------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (0.13) $ 0.22 $ 0.79 $ (0.43) $ 0.21 -------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 9.55 $ 9.68 $ 9.46 $ 8.67 $ 9.10 ================================================================================================================================ Total return* 1.69% 7.30% 14.68% 3.42% 7.63%(b) Ratio of net expenses to average net assets+ 0.65%** 0.65% 0.63% 0.65% 0.58%** Ratio of net investment income to average net assets+ 4.45%** 4.82% 5.00% 5.91% 5.00%** Portfolio turnover rate 21%** 36% 41% 34% 73% Net assets, end of period (in thousands) $ 1,788 $ 787 $ 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 0.90%** 0.72% 0.63% 0.67% 0.58%** Net investment income 4.20%** 4.75% 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%** 0.65% 0.63% 0.65% 0.58%** Net investment income 4.45%** 4.82% 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. Pioneer Bond Fund | Semiannual Report | 12/31/11 63 Notes to Financial Statements | 12/31/11 (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. The Fund's financial statements have been prepared in conformity with U.S. generally accepted accounting principles that require the management of the Fund to, among other things, make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of income, expenses and gains and losses on investments during the reporting period. Actual results could differ from those estimates. 64 Pioneer Bond Fund | Semiannual Report | 12/31/11 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. 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. 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. Examples of a significant event might include political or economic news, corporate restructurings, natural disasters, terrorist activity or trading halts. Thus, the valuation of the Fund's securities may differ from exchange prices. At December 31, 2011, one security was valued using fair value methods (in addition to securities valued using prices supplied by independent pricing services) representing 0.01% 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. Pioneer Bond Fund | Semiannual Report | 12/31/11 65 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 federal and state tax authorities. The amounts and characterizations of distributions to shareowners for financial reporting purposes are determined in accordance with federal income tax rules. Therefore, the sources of the Fund's distributions may be shown in the accompanying financial statements as from or in excess of net investment income or as from net realized gain on investment transactions, or as from paid-in capital, depending on the type of book/tax differences that may exist. The tax character of current year 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, 2011 was as follows: -------------------------------------------------------------------------------- 2011 -------------------------------------------------------------------------------- Distributions paid from: Ordinary income $ 57,808,812 -------------------------------------------------------------------------------- Total $ 57,808,812 ================================================================================ 66 Pioneer Bond Fund | Semiannual Report | 12/31/11 The following shows the components of distributable earnings on a federal income tax basis at June 30, 2011. -------------------------------------------------------------------------------- 2011 -------------------------------------------------------------------------------- Distributable earnings: Undistributed ordinary income $ 2,623,165 Undistributed long-term gain 6,833,664 Capital loss carryforward (19,855,305) Dividends payable (2,077,073) Net unrealized gain 55,248,405 -------------------------------------------------------------------------------- Total $ 42,772,856 ================================================================================ The difference between book-basis and tax-basis net unrealized gain is attributable to the tax deferral of losses on wash sales, adjustments relating to catastrophe bonds, interest on defaulted bonds, the tax treatment of premium and amortization and the mark to market of futures contracts. 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 $58,902 in underwriting commissions on the sale of Class A shares during the six months ended December 31, 2011. 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 $18,311 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 Pioneer Bond Fund | Semiannual Report | 12/31/11 67 manner and at the same time, except that net investment income dividends 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. Risks At times, the Fund's investments may represent industries or industry sectors that are interrelated or have common risks, making the Fund more susceptible to any economic, political, or regulatory developments or other risks affecting those industries and sectors. The Fund's prospectus contains unaudited information regarding the Fund's principal risks. Please refer to that document when considering the Fund's principal risks. F. 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 number of contracts open during the six months ended December 31, 2011 was 1,127. 68 Pioneer Bond Fund | Semiannual Report | 12/31/11 At December 31, 2011, open futures contracts were as follows: -------------------------------------------------------------------------------- Number of Contracts Settlement Unrealized Type Long/(Short) Month Value Gain/(Loss) -------------------------------------------------------------------------------- U.S. 10 Year Note (660) 3/12 $86,542,500 $ (794,063) U.S. 2 Year Note (CBT) (278) 3/12 61,312,010 (13,031) U.S. 5 Year Note (CBT) 221 3/12 27,239,974 105,096 U.S. Long Bond (46) 3/12 6,661,375 (31,625) U.S. Ultra Bond (CBT) 31 3/12 4,965,813 26,641 -------------------------------------------------------------------------------- $ (706,982) -------------------------------------------------------------------------------- G. Repurchase Agreements With respect to repurchase agreements entered into by the Fund, the value of the underlying securities (collateral), including accrued interest, is required to be equal to or in excess of the repurchase price. The collateral for all repurchase agreements is held in safekeeping in the customer-only account of the Fund's custodian or a subcustodian of the Fund. The Fund's investment adviser, Pioneer Investment Management, Inc. (PIM), is responsible for determining that the value of the collateral remains at least equal to the repurchase price. H. Securities Lending The Fund may lend securities in its portfolio to certain broker-dealers or other institutional investors. When entering into a securities loan transaction, the Fund typically receives cash collateral from the borrower equal to at least the value of the securities loaned, which is invested in temporary investments. Credit Suisse AG, New York Branch, as the Fund's securities lending agent, manages the Fund's securities lending collateral. The income earned on the investment of collateral is shared with the borrower and the lending agent in payment of any rebate due to the borrower with respect to the securities loan, and in compensation for the lending agent's services to the Fund. The Fund also continues to receive payments in lieu of dividends or interest on the securities loaned. Gain or loss on the value of the loaned securities that may occur during the term of the loan will be for the account of the Fund. The amount of the collateral is required to be adjusted daily to reflect any price fluctuation in the value of the loaned securities. If the required market value of the collateral is less than the value of the loaned securities, the borrower is required to deliver additional collateral for the account of the Fund prior to the close of business on that day. The Fund has the right, under the lending agreement, to terminate the loan and recover the securities from the borrower with prior notice. The Fund is required to return the cash collateral to the borrower and could suffer a loss if the value of the collateral, as invested, has declined. At December 31, 2011, the Fund had no securities on loan. Pioneer Bond Fund | Semiannual Report | 12/31/11 69 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, 2011, 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. Fees waived and expenses reimbursed during the six months ended December 31, 2011 are reflected on the Statement of Operations. These expense limitations are in effect through November 1, 2013 for Class A, Class B, Class C, Class R and Class Z 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 dates referred to above. In addition, under the management and administration agreements, certain other services and costs, including accounting, regulatory reporting, and insurance premiums, are paid by the Fund as administrative reimbursements. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $37,365 in management fees, administrative costs and certain other reimbursements payable to PIM at December 31, 2011. 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, 2011, such out-of-pocket expenses by class of shares were as follows: -------------------------------------------------------------------------------- Shareholder Communications: -------------------------------------------------------------------------------- Class A $315,385 Class B 8,225 Class C 49,435 Class R 22,391 Class Y 256,554 Class Z 1,271 -------------------------------------------------------------------------------- Total: $653,261 ================================================================================ 70 Pioneer Bond Fund | Semiannual Report | 12/31/11 Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $258,112 in transfer agent fees and out-of-pocket reimbursements payable to PIMSS at December 31, 2011. 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 $12,197 in distribution fees payable to PFD at December 31, 2011. 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 12 months of purchase. Class B shares that are redeemed within five years of purchase are subject to a CDSC at declining rates beginning at 4.00%, based on the lower of cost or market value of shares being redeemed. Redemptions of Class C shares within one year of purchase are subject to a CDSC of 1.00%, based on the lower of cost or market value of shares being redeemed. Shares purchased as part of an exchange remain subject to any CDSC that applied to the original purchase of those shares. There is no CDSC for Class R, Class Y or Class Z shares. Proceeds from the CDSCs are paid to PFD. For the six months ended December 31, 2011, CDSCs in the amount of $13,171 were paid to PFD. Pioneer Bond Fund | Semiannual Report | 12/31/11 71 5. Expense Offset Arrangements The Fund has entered into certain expense offset arrangements with PIMSS which may result in a reduction in the Fund's total expenses due to interest earned on cash held by PIMSS. For the six months ended December 31, 2011, the Fund's expenses were not reduced under such arrangements. 6. Additional Disclosures about Derivative Instruments and Hedging Activities: Values of derivative instruments as of December 31, 2011 were as follows: ---------------------------------------------------------------------------------- Derivatives Not Accounted for as Hedging Instruments Liabilities Derivatives Under Accounting Standards Asset Derivatives 2011 2011 Codification (ASC) 815 ---------------------------------------------------- Balance Balance Sheet Location Value Sheet Location Value ---------------------------------------------------------------------------------- Interest Rate Futures* Receivables Payables $70,982 ---------------------------------------------------------------------------------- Total ================================================================================== * Reflects the unrealized depreciation on futures contracts (see Note 1F). The current day's variation margin is separately disclosed on the Statement of Assets and Liabilities. The effect of derivative instruments on the Statement of Operations for the six months ended December 31, 2011 was as follows: ----------------------------------------------------------------------------------------------------------- Derivatives Not Change in Accounted for as Realized Gain Unrealized Hedging Instruments or (Loss) on Gain or (Loss) Under Accounting Derivatives on Derivatives Standards Codification Location of Gain or (Loss) Recognized in Recognized in (ASC) 815 on Derivatives Recognized in Income Income Income ----------------------------------------------------------------------------------------------------------- Interest Rate Futures Net realized loss on futures contracts $(287,181) Interest Rate Futures Change in unrealized loss on futures contracts $(729,063) =========================================================================================================== 72 Pioneer Bond Fund | Semiannual Report | 12/31/11 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 2011 as the Trustees of the Fund agreed on, among other things, an overall approach and timeline for the process. In July 2011, 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 July 2011 and September 2011. 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, 2011 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 29, 2011, 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. The Trustees also considered the substantial attention and high priority given by PIM's senior management to the Pioneer fund complex. In addition, the Trustees considered PIM's plans to increase resources in its investment management function and other enhancements to PIM's advisory capabilities. Pioneer Bond Fund | Semiannual Report | 12/31/11 73 The Trustees considered that PIM supervises and monitors the performance of the Fund's service providers and provides the Fund with personnel (including Fund officers) and other resources that are necessary for the Fund's business management and operations. The Trustees also considered that, as administrator, PIM is responsible for the administration of the Fund's business and other affairs. The Trustees considered the fees paid to PIM for the provision of administration services. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that had been provided by PIM to the Fund were satisfactory and consistent with the terms of the investment advisory agreement. Performance of the Fund The Trustees considered the performance results of the Fund over various time periods. They reviewed information comparing the Fund's performance with the performance of its peer group of funds as classified by Morningstar, Inc. (Morningstar), an independent provider of investment company data, and with the performance of the Fund's benchmark index. The Trustees considered that the Fund's annualized total return was in the first quintile of its Morningstar category for the one and five year periods ended June 30, 2011 and in the second quintile of its Morningstar category for the three year period ended June 30, 2011. (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 also considered that the Fund's twelve month average gross portfolio yield (using month end 30 day effective yields) exceeded the twelve month average yield of the Fund's benchmark index. 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 and expense ratios of its peer group of funds as classified by Morningstar and also to 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, 2011 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, 2011 was in 74 Pioneer Bond Fund | Semiannual Report | 12/31/11 the second quintile relative to its Strategic Insight peer group for the comparable period. The Trustees reviewed gross and net management fees charged by PIM to its institutional and other clients, including publicly offered European funds, U.S. registered investment companies (in a sub-advisory capacity), and unaffiliated foreign and domestic separate accounts. The Trustees also considered PIM's costs in providing services to the Fund and to its other clients and considered the differences in management fees and profit margins for PIM's Fund and non-Fund services. 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 also considered the different entrepreneurial risks associated with PIM's management of the Fund and the other client accounts. 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. 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, rarely identifiable on a Fund-by-Fund basis, 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 Pioneer Bond Fund | Semiannual Report | 12/31/11 75 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. 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. 76 Pioneer Bond Fund | Semiannual Report | 12/31/11 Trustees, Officers and Service Providers Trustees Officers John F. Cogan, Jr., Chairman John F. Cogan, Jr., President David R. Bock Daniel K. Kingsbury, Executive Mary K. Bush Vice President Benjamin M. Friedman Mark E. Bradley, Treasurer Margaret B.W. Graham Christopher J. Kelley, Secretary Daniel K. Kingsbury Thomas J. Perna Marguerite A. Piret 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 us.pioneerinvestments.com. This information is also available on the Securities and Exchange Commission's web site at www.sec.gov. Pioneer Bond Fund | Semiannual Report | 12/31/11 77 This page for your notes. 78 Pioneer Bond Fund | Semiannual Report | 12/31/11 This page for your notes. Pioneer Bond Fund | Semiannual Report | 12/31/11 79 This page for your notes. 80 Pioneer Bond Fund | Semiannual Report | 12/31/11 This page for your notes. Pioneer Bond Fund | Semiannual Report | 12/31/11 81 This page for your notes. 82 Pioneer Bond Fund | Semiannual Report | 12/31/11 This page for your notes. Pioneer Bond Fund | Semiannual Report | 12/31/11 83 This page for your notes. 84 Pioneer Bond Fund | Semiannual Report | 12/31/11 How to Contact Pioneer We are pleased to offer a variety of convenient ways for you to contact us for assistance or information. Call us for: -------------------------------------------------------------------------------- Account Information, including existing accounts, new accounts, prospectuses, applications and service forms 1-800-225-6292 FactFone(SM) for automated fund yields, prices, account information and transactions 1-800-225-4321 Retirement plans information 1-800-622-0176 Write to us: -------------------------------------------------------------------------------- PIMSS, Inc. P.O. Box 55014 Boston, Massachusetts 02205-5014 Our toll-free fax 1-800-225-4240 Our internet e-mail address ask.pioneer@pioneerinvestments.com (for general questions about Pioneer only) Visit our web site: us.pioneerinvestments.com This report must be preceded or accompanied by a prospectus. The Fund files a complete schedule of investments with the Securities and Exchange Commission for the first and third quarters for each fiscal year on Form N-Q. Shareholders may view the filed Form N-Q by visiting the Commission's web site at 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 (see attachment); (2) Post the text of such code of ethics on its Internet website and disclose, in its most recent report on this Form N-CSR, its Internet address and the fact that it has posted such code of ethics on its Internet website; or (3) Undertake in its most recent report on this Form N-CSR to provide to any person without charge, upon request, a copy of such code of ethics and explain the manner in which such request may be made. 	See Item 10(2) ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT. (a) (1) Disclose that the registrant's board of trustees has determined that the registrant either: (i) Has at least one audit committee financial expert serving on its audit committee; or (ii) Does not have an audit committee financial expert serving on its audit committee. The registrant's Board of Trustees has determined that the registrant has at least one audit committee financial expert. (2) If the registrant provides the disclosure required by paragraph (a)(1)(i) of this Item, it must disclose the name of the audit committee financial expert and whether that person is "independent." In order to be considered "independent" for purposes of this Item, a member of an audit committee may not, other than in his or her capacity as a member of the audit committee, the board of trustees, or any other board committee: (i) Accept directly or indirectly any consulting, advisory, or other compensatory fee from the issuer; or (ii) Be an "interested person" of the investment company as defined in Section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19)). Ms. Marguerite A. Piret, an independent trustee, is such an audit committee financial expert. (3) If the registrant provides the disclosure required by paragraph (a)(1) (ii) of this Item, it must explain why it does not have an audit committee financial expert. Not applicable. ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES. (a) Disclose, under the caption AUDIT FEES, the aggregate fees billed for each of the last two fiscal years for professional services rendered by the principal accountant for the audit of the registrant's annual financial statements or services that are normally provided by the accountant in connection with statutory and regulatory filings or engagements for those fiscal years. N/A (b) Disclose, under the caption AUDIT-RELATED FEES, the aggregate fees billed in each of the last two fiscal years for assurance and related services by the principal accountant that are reasonably related to the performance of the audit of the registrant's financial statements and are not reported under paragraph (a) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A (c) Disclose, under the caption TAX FEES, the aggregate fees billed in each of the last two fiscal years for professional services rendered by the principal accountant for tax compliance, tax advice, and tax planning. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A (d) Disclose, under the caption ALL OTHER FEES, the aggregate fees billed in each of the last two fiscal years for products and services provided by the principal accountant, other than the services reported in paragraphs (a) through (c) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A (e) (1) Disclose the audit committee's pre-approval policies and procedures described in paragraph (c)(7) of Rule 2-01 of Regulation S-X. PIONEER FUNDS APPROVAL OF AUDIT, AUDIT-RELATED, TAX AND OTHER SERVICES PROVIDED BY THE INDEPENDENT AUDITOR SECTION I - POLICY PURPOSE AND APPLICABILITY The Pioneer Funds recognize the importance of maintaining the independence of their outside auditors. Maintaining independence is a shared responsibility involving Pioneer Investment Management, Inc ("PIM"), the audit committee and the independent auditors. The Funds recognize that a Fund's independent auditors: 1) possess knowledge of the Funds, 2) are able to incorporate certain services into the scope of the audit, thereby avoiding redundant work, cost and disruption of Fund personnel and processes, and 3) have expertise that has value to the Funds. As a result, there are situations where it is desirable to use the Fund's independent auditors for services in addition to the annual audit and where the potential for conflicts of interests are minimal. Consequently, this policy, which is intended to comply with Rule 210.2-01(C)(7), sets forth guidelines and procedures to be followed by the Funds when retaining the independent audit firm to perform audit, audit-related tax and other services under those circumstances, while also maintaining independence. Approval of a service in accordance with this policy for a Fund shall also constitute approval for any other Fund whose pre-approval is required pursuant to Rule 210.2-01(c)(7)(ii). In addition to the procedures set forth in this policy, any non-audit services that may be provided consistently with Rule 210.2-01 may be approved by the Audit Committee itself and any pre-approval that may be waived in accordance with Rule 210.2-01(c)(7)(i)(C) is hereby waived. Selection of a Fund's independent auditors and their compensation shall be determined by the Audit Committee and shall not be subject to this policy. SECTION II - POLICY ---------------- -------------------------------- ------------------------------------------------- SERVICE SERVICE CATEGORY DESCRIPTION SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES CATEGORY ---------------- -------------------------------- ------------------------------------------------- I. AUDIT Services that are directly o Accounting research assistance SERVICES related to performing the o SEC consultation, registration independent audit of the Funds statements, and reporting o Tax accrual related matters o Implementation of new accounting standards o Compliance letters (e.g. rating agency letters) o Regulatory reviews and assistance regarding financial matters o Semi-annual reviews (if requested) o Comfort letters for closed end offerings ---------------- -------------------------------- ------------------------------------------------- II. Services which are not o AICPA attest and agreed-upon procedures AUDIT-RELATED prohibited under Rule o Technology control assessments SERVICES 210.2-01(C)(4) (the "Rule") o Financial reporting control assessments and are related extensions of o Enterprise security architecture the audit services support the assessment audit, or use the knowledge/expertise gained from the audit procedures as a foundation to complete the project. In most cases, if the Audit-Related Services are not performed by the Audit firm, the scope of the Audit Services would likely increase. The Services are typically well-defined and governed by accounting professional standards (AICPA, SEC, etc.) ---------------- -------------------------------- ------------------------------------------------- ------------------------------------- ------------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the audit period for all services and related fees pre-approved specific service reported at each regularly subcategories. Approval of the scheduled Audit Committee independent auditors as meeting. auditors for a Fund shall constitute pre approval for these services. ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the fund fiscal year within services and related fees a specified dollar limit (including comparison to for all pre-approved specified dollar limits) specific service subcategories reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limit for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for Audit-Related Services not denoted as "pre-approved", or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------------------ SECTION III - POLICY DETAIL, CONTINUED ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- --------------------------- ----------------------------------------------- III. TAX SERVICES Services which are not o Tax planning and support prohibited by the Rule, o Tax controversy assistance if an officer of the Fund o Tax compliance, tax returns, excise determines that using the tax returns and support Fund's auditor to provide o Tax opinions these services creates significant synergy in the form of efficiency, minimized disruption, or the ability to maintain a desired level of confidentiality. ----------------------- --------------------------- ----------------------------------------------- ------------------------------------- ------------------------- AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------- ------------------------------------- ------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year all such services and within a specified dollar limit related fees 				 (including comparison 			 to specified dollar 			 limits) reported 			 quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for tax services not denoted as pre-approved, or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------- SECTION III - POLICY DETAIL, CONTINUED ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- --------------------------- ----------------------------------------------- IV. OTHER SERVICES Services which are not o Business Risk Management support prohibited by the Rule, o Other control and regulatory A. SYNERGISTIC, if an officer of the Fund compliance projects UNIQUE QUALIFICATIONS determines that using the Fund's auditor to provide these services creates significant synergy in the form of efficiency, minimized disruption, the ability to maintain a desired level of confidentiality, or where the Fund's auditors posses unique or superior qualifications to provide these services, resulting in superior value and results for the Fund. ----------------------- --------------------------- ----------------------------------------------- --------------------------------------- ------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- -------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year within all such services and a specified dollar limit related fees 			 (including comparison 			 to specified dollar 				 limits) reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for "Synergistic" or "Unique Qualifications" Other Services not denoted as pre-approved to the left, or to add a specific service subcategory as "pre-approved" ------------------------------------- -------------------------- SECTION III - POLICY DETAIL, CONTINUED ----------------------- ------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PROHIBITED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- ------------------------- ----------------------------------------------- PROHIBITED SERVICES Services which result 1. Bookkeeping or other services in the auditors losing related to the accounting records or independence status financial statements of the audit under the Rule. client* 2. Financial information systems design and implementation* 3. Appraisal or valuation services, fairness* opinions, or contribution-in-kind reports 4. Actuarial services (i.e., setting actuarial reserves versus actuarial audit work)* 5. Internal audit outsourcing services* 6. Management functions or human resources 7. Broker or dealer, investment advisor, or investment banking services 8. Legal services and expert services unrelated to the audit 9. Any other service that the Public Company Accounting Oversight Board determines, by regulation, is impermissible ----------------------- ------------------------- ----------------------------------------------- ------------------------------------------- ------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------------- ------------------------------ o These services are not to be o A summary of all performed with the exception of the(*) services and related services that may be permitted fees reported at each if they would not be subject to audit regularly scheduled procedures at the audit client (as Audit Committee meeting defined in rule 2-01(f)(4)) level will serve as continual the firm providing the service. confirmation that has 				 not provided any restricted services. ------------------------------------------- ------------------------------ -------------------------------------------------------------------------------- GENERAL AUDIT COMMITTEE APPROVAL POLICY: o For all projects, the officers of the Funds and the Fund's auditors will each make an assessment to determine that any proposed projects will not impair independence. o Potential services will be classified into the four non-restricted service categories and the "Approval of Audit, Audit-Related, Tax and Other Services" Policy above will be applied. Any services outside the specific pre-approved service subcategories set forth above must be specifically approved by the Audit Committee. o At least quarterly, the Audit Committee shall review a report summarizing the services by service category, including fees, provided by the Audit firm as set forth in the above policy. -------------------------------------------------------------------------------- (2) Disclose the percentage of services described in each of paragraphs (b) through (d) of this Item that were approved by the audit committee pursuant to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X. N/A (f) If greater than 50 percent, disclose the percentage of hours expended on the principal accountant's engagement to audit the registrant's financial statements for the most recent fiscal year that were attributed to work performed by persons other than the principal accountant's full-time, permanent employees. N/A (g) Disclose the aggregate non-audit fees billed by the registrant's accountant for services rendered to the registrant, and rendered to the registrant's investment adviser (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant for each of the last two fiscal years of the registrant. N/A (h) Disclose whether the registrant's audit committee of the board of trustees has considered whether the provision of non-audit services that were rendered to the registrant's investment adviser (not including any subadviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the investment adviser that provides ongoing services to the registrant that were not pre-approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant's independence. The Fund's audit committee of the Board of Trustees has considered whether the provision of non-audit services that were rendered to the Affiliates (as defined) that were not pre- approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant's independence. Item 5. Audit Committee of Listed Registrants (a) If the registrant is a listed issuer as defined in Rule 10A-3 under the Exchange Act (17 CFR 240.10A-3), state whether or not the registrant has a separately-designated standing audit committee established in accordance with Section 3(a)(58)(A) of the Exchange Act (15 U.S.C. 78c(a)(58)(A)). If the registrant has such a committee, however designated, identify each committee member. If the entire board of directors is acting as the registrants audit committee as specified in Section 3(a)(58)(B) of the Exchange Act (15 U.S.C. 78c(a)(58)(B)), so state. N/A (b) If applicable, provide the disclosure required by Rule 10A-3(d) under the Exchange Act (17 CFR 240.10A-3(d)) regarding an exemption from the listing standards for audit committees. N/A Item 6. Schedule of Investments. File Schedule I Investments in securities of unaffiliated issuers as of the close of the reporting period as set forth in 210.12- 12 of Regulation S-X [17 CFR 210.12-12], unless the schedule is included as part of the report to shareholders filed under Item 1 of this Form. Included in Item 1 ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END MANAGEMENT INVESTMENT COMPANIES. A closed-end management investment company that is filing an annual report on this Form N-CSR must, unless it invests exclusively in non-voting securities, describe the policies and procedures that it uses to determine how to vote proxies relating to portfolio securities, including the procedures that the company uses when a vote presents a conflict between the interests of its shareholders, on the one hand, and those of the company's investment adviser; principal underwriter; or any affiliated person (as defined in Section 2(a)(3) of the Investment Company Act of 1940 (15 U.S.C. 80a-2(a)(3)) and the rules thereunder) of the company, its investment adviser, or its principal underwriter, on the other. Include any policies and procedures of the company's investment adviser, or any other third party, that the company uses, or that are used on the company's behalf, to determine how to vote proxies relating to portfolio securities. Not applicable to open-end management investment companies. Item 8. Portfolio Managers of Closed-End Management Investment Companies. (a) If the registrant is a closed-end management investment company that is filing an annual report on this Form N-CSR,provide the following information: (1) State the name, title, and length of service of the person or persons employed by or associated with the registrant or an investment adviser of the registrant who are primarily responsible for the day-to-day management of the registrants portfolio (Portfolio Manager). Also state each Portfolio Managers business experience during the past 5 years. Not applicable to open-end management investment companies. Item 9. Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers. (a) If the registrant is a closed-end management investment company, in the following tabular format, provide the information specified in paragraph (b) of this Item with respect to any purchase made by or on behalf of the registrant or any affiliated purchaser, as defined in Rule 10b-18(a)(3) under the Exchange Act (17 CFR 240.10b-18(a)(3)), of shares or other units of any class of the registrants equity securities that is registered by the registrant pursuant to Section 12 of the Exchange Act (15 U.S.C. 781). Instruction to paragraph (a). Disclose all purchases covered by this Item, including purchases that do not satisfy the conditions of the safe harbor of Rule 10b-18 under the Exchange Act (17 CFR 240.10b-18), made in the period covered by the report. Provide disclosures covering repurchases made on a monthly basis. For example, if the reporting period began on January 16 and ended on July 15, the chart would show repurchases for the months from January 16 through February 15, February 16 through March 15, March 16 through April 15, April 16 through May 15, May 16 through June 15, and June 16 through July 15. Not applicable to open-end management investment companies. Item 10. Submission of Matters to a Vote of Security Holders. Describe any material changes to the procedures by which shareholders may recommend nominees to the registrants board of directors, where those changes were implemented after the registrant last provided disclosure in response to the requirements of Item 7(d)(2)(ii)(G) of Schedule 14A (17 CFR 240.14a-101), or this Item. There have been no material changes to the procedures by which the shareholders may recommend nominees to the registrants board of directors since the registrant last provided disclosure in response to the requirements of Item 7(d)(2)(ii)(G) of Schedule 14(A) in its definitive proxy statement, or this Item. ITEM 11. CONTROLS AND PROCEDURES. (a) Disclose the conclusions of the registrant's principal executive officer or officers and principal financial officer or officers, or persons performing similar functions, about the effectiveness of the registrant's disclosure controls and procedures (as defined in Rule 30a-2(c) under the Act (17 CFR 270.30a-2(c))) based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of the report that includes the disclosure required by this paragraph. The registrant's principal executive officer and principal financial officer have concluded that the registrant's disclosure controls and procedures are effective based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this report. (b) Disclose whether or not there were significant changes in the registrant's internal controls or in other factors that could significantly affect these controls subsequent to the date of their evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses. There were no significant changes in the registrant's internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. The registrant's principal executive officer and principal financial officer, however, voluntarily are reporting the following information: In August of 2006 the registrant's investment adviser enhanced its internal procedures for reporting performance information required to be included in prospectuses. Those enhancements involved additional internal controls over the appropriateness of performance data generated for this purpose. Such enhancements were made following an internal review which identified prospectuses relating to certain classes of shares of a limited number of registrants where, inadvertently, performance information not reflecting the deduction of applicable sales charges was included. Those prospectuses were revised, and the revised prospectuses were distributed to shareholders. ITEM 12. EXHIBITS. File the exhibits listed below as part of this Form. Letter or number the exhibits in the sequence indicated. (a) Any code of ethics, or amendment thereto, that is the subject of the disclosure required by Item 2, to the extent that the registrant intends to satisfy the Item 2 requirements through filing of an exhibit. (b) A separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2 under the Act (17 CFR 270.30a-2). Filed herewith. SIGNATURES [See General Instruction F] Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. (Registrant) Pioneer Bond Fund By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr, President Date February 29, 2012 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr., President Date February 29, 2012 By (Signature and Title)* /s/ Mark Bradley Mark Bradley, Treasurer & Chief Accounting & Financial Officer Date February 29, 2012 * Print the name and title of each signing officer under his or her signature.