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 811-21108 Pioneer Series Trust X (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: March 31 Date of reporting period: April 1, 2012 through March 31, 2013 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 Fundamental Growth Fund -------------------------------------------------------------------------------- Annual Report | March 31, 2013 -------------------------------------------------------------------------------- Ticker Symbols: Class A PIGFX Class B FUNBX Class C FUNCX Class K PFGKX** Class R PFGRX* Class Y FUNYX Class Z PFGZX* * Share class was first publicly offered on April 2, 2012. ** Share class was first publicly offered on December 20, 2012. [LOGO] PIONEER Investments(R) visit us: us.pioneerinvestments.com Table of Contents Letter to Shareowners 2 Portfolio Management Discussion 4 Portfolio Summary 10 Prices and Distributions 11 Performance Update 12 Comparing Ongoing Fund Expenses 19 Schedule of Investments 21 Financial Statements 26 Notes to Financial Statements 37 Report of Independent Registered Public Accounting Firm 45 Approval of Investment Advisory Agreement 47 Trustees, Officers and Service Providers 51 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 1 President's Letter Dear Shareowner, Pioneer continues to see only modest economic growth in the U.S. Employment continues to rise, albeit slowly, and we believe it will continue to do so in 2013, barring a negative shock to the system. The housing and auto sectors continue to recover, benefiting from record-low interest rates. Banks' willingness to lend to consumers and businesses also continues to rise, broad measures of inflation remain subdued, and, if the weather cooperates in 2013, food prices should come back down. And, while corporate profit growth has slowed, profits remain high and many U.S. companies continue to both pay and increase dividends*. Offsetting some of these positives are the continued contraction of fiscal policy in Washington and a recessionary Europe. The Federal Reserve's aggressive monetary policy has driven Treasury yields to generational lows and supported investments in all financial assets, including equities and high-yield corporate bonds. For example, the Standard & Poor's 500 Index (the S&P 500), a broad measure of the U.S. stock market, returned 15.99% for the full calendar year ended December 31, 2012, and the Bank of America Merrill Lynch High Yield Master II Index (the High Yield Index), which measures the performance of high-yield corporate bonds, returned 15.59% for the same 12-month period. On the other hand, the Barclays Aggregate Bond Index (the Aggregate Index), which tracks the performance of a higher-quality bond universe, gained 4.22% for the 12 months ended December 31, 2012; the safer-still Barclays Government Credit Index (the Government/Credit Index) returned 4.82%; and 3-month Treasury bills, generally regarded as essentially "risk free" by the markets, returned just 0.09% in 2012. "Risky" assets outperformed again in the first quarter of 2013, as the S&P 500 returned 10.60% and the High Yield Index returned 2.89%. In contrast, the Aggregate Index returned -0.12% in the first quarter, the Government Credit Index returned -0.16%, and Treasury bills returned 0.02%. Despite generally improving economic conditions and a rising stock market, global economies and investors still face daunting challenges as 2013 moves forward, although we remain cautiously optimistic. U.S. fiscal policy remains unsettled, and we feel the U.S. government could be at risk of credit rating downgrades from one or more of the major ratings agencies if the uncertainties persist. The Federal Reserve continues to provide extraordinary support to the U.S. economy and the bond market, but will not do so indefinitely. Europe has made progress, but has not yet resolved its sovereign-debt/banking problem, nor has the region been able to exit recession. Japan recently has unveiled aggressive and unconventional monetary and fiscal policies, but the country * Dividends are not guaranteed. 2 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 continues to face issues such as high levels of debt as well as an aging population. China and other emerging economies, while generally in better shape than most "developed" markets, also face a range of challenges. While most of the risks outlined here are widely recognized and may already be "priced in" to the market, we believe investors should continue to expect market volatility. At Pioneer, we have long advocated the benefits of staying diversified and investing for the long term. And while diversification does not assure a profit or protect against loss in a declining market, we believe there are still opportunities for prudent investors to earn attractive returns. 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, keeping in mind that there is no single best strategy that works for every investor. Pioneer's investment teams have, since 1928, sought out attractive opportunities in global equity and bond markets, using in-depth research to identify undervalued individual securities, and using thoughtful risk management to construct portfolios which balance potential risks and reward in an ever-changing world. We encourage you to learn more about Pioneer and our time-tested approach to investing by consulting with your financial advisor or visiting us online at us.pioneerinvestments.com. We greatly appreciate your trust in us, and we thank you for investing with Pioneer. Sincerely, /s/ Daniel K. Kingsbury Daniel K. Kingsbury President and CEO Pioneer Investment Management USA, Inc. Any information in this shareowner report regarding market or economic trends or the factors influencing the Fund's historical or future performance are statements of opinion as of the date of this report. These statements should not be relied upon for any other purposes. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 3 Portfolio Management Discussion | 3/31/13 The equity market delivered healthy returns over the 12 months ended March 31, 2013, as rising investor confidence in the prospects for a continuing global economic recovery spurred a rally in financial assets. The rally in stock prices strengthened during most of the period, especially after investors overcame concerns about another flare-up in the European sovereign-debt crisis in the early summer of 2012. In the following interview, Andrew Acheson and Paul Cloonan* discuss the factors that affected the performance of Pioneer Fundamental Growth Fund during the 12 months ended March 31, 2013. Mr. Acheson, a senior vice president and portfolio manager at Pioneer, and Mr. Cloonan, a senior vice president and portfolio manager, and Co-Head of Equity Research, U.S., at Pioneer, are responsible for day-to-day management of the Fund. Q How did the Fund perform during the 12 months ended March 31, 2013? A Pioneer Fundamental Growth Fund's Class A shares returned 9.64% at net asset value during the 12 months ended March 31, 2013, while the Fund's benchmark, the Russell 1000 Growth Index (the Russell Index), returned 10.09%. During the same 12-month period, the average return of the 702 mutual funds in Lipper's Large Cap Growth category was 7.36%. Q How would you describe the investment environment for equities during the 12 months ended March 31, 2013? A Equity values generally rose during the full 12-month period, as investors eventually brushed aside concerns about the sovereign-debt problems in Europe, weakening growth trends in China and sluggish economic growth as well as stubbornly high unemployment in the United States. Very early in the period, in the spring of 2012, stocks sold off amid growing fears that the global economic recovery could be undermined by the ripple effects of sovereign-debt problems in some European nations, most notably Greece, Spain and Italy. Market sentiment began to change, however, in August 2012, when the new leader of the European Central Bank (ECB) declared the ECB would do "whatever it takes" to protect the European Union and the euro currency. Not long after that announcement, the U.S. Federal Reserve Board announced its third round of quantitative easing, and some signs of improving growth in China and the United States followed. In response to the series of positive developments, equities began a rally that continued almost uninterrupted for the remainder of the Fund's fiscal year * Effective November 1, 2012, Paul Cloonan joined Andrew Acheson as a portfolio manager of the Fund, replacing Tim Mulrenan. 4 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 ended March 31, 2013. Almost all market sectors, with the notable exception of the information technology group, recorded double-digit percentage gains for the 12-month period. The more defensive sectors such as consumer staples and health care fared especially well, but the stock market showed broad strength across almost all industries as rising confidence about the durability of the global economic recovery drove investors into equities and other so-called "risk" assets. Q Which investment decisions or individual securities had the greatest effect on the Fund's returns relative to the benchmark Russell Index during the 12 months ended March 31, 2013? A The Fund's performance during the period tracked closely to that of the Russell Index. Stock selection results in two sectors, energy (negative) and information technology (positive), had by far the biggest effect on the Fund's relative performance during the 12-month period. Sector allocation decisions, which tend to be a byproduct of our stock-selection process, contributed to the Fund's benchmark-relative performance during the period. Stock selection in the energy sector was a large drag on benchmark-relative results during the period. One particular disappointment for the Fund in the sector was a position in National Oilwell Varco (NOV), a provider of equipment and services for oil and natural gas drilling operations. NOV's share price weakened during the period as the company's backlog of new orders began to slow and investors began worrying that the positive cycle in energy development may have peaked. We became concerned that NOV would start to experience a significant decline in returns on reinvested capital, and so we decided to sell the Fund's position. While we sold the position in NOV, we retained a Fund investment in another underperforming energy company, Occidental Petroleum, a diversified firm involved in both oil and natural gas operations. The company appeared to struggle with managing its cost structure during the 12-month period, but it has implemented operational reforms that we believe have the potential to improve future results. Stock selection in the information technology sector was the Fund's most significant positive performance driver during the 12-month period, with a holding in MasterCard the top individual contributor to returns within the sector. A leading global financial transaction-processing company, MasterCard enjoyed solid, double-digit gains from both its credit and debit card businesses during the period, including gains from international cross-border transactions. Another outstanding performer within the Fund's information technology portfolio during the period was a position Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 5 in ASML, a semiconductor firm based in the Netherlands whose share price received a boost when three major customers - Samsung, Taiwan Semiconductor, and Intel - all became equity investors in the company. Following the announcements by those three companies, we took advantage of the price appreciation in ASML's stock and took profits by selling the Fund's position. To be sure, the Fund did own some disappointing positions in the information technology sector during the period, including Juniper Networks, a communications network equipment company whose performance was hurt due to slowing infrastructure investing by telecommunication providers. Another poor-performing Fund position in the sector during the period was software giant Microsoft, which underperformed as a result of the overall slump in the personal computers market as well as disappointing early sales of the company's new Windows 8 software. Elsewhere, the Fund's overweight position in health care as well as good stock selection results in the sector helped to support relative returns during the period. In health care, Fund positions in Thermo Fisher Scientific, Celgene and DaVita performed especially well during the 12-month period. Thermo Fisher Scientific, which produces scientific and laboratory equipment, performed well as investors appreciated the company's ability to generate stable growth in an uncertain environment. Celgene is a biotechnology company that specializes in developing therapies to treat cancer and immune-inflammatory diseases. Celgene's stock value rose as investors saw strong potential for some of the company's drugs under development. DaVita, the nation's largest operator of kidney dialysis centers, generated solid growth in its business during the period, while announcing plans to acquire Health Care Partners, the largest physician network in the United States. The market viewed the acquisition as an opportunity for DaVita to add to its earnings potential. Other noteworthy contributors to the Fund's performance during the period included positions in Disney, in the consumer discretionary sector, and pharmacy chain CVS, in the consumer staples sector. Disney's performance benefited from improving prospects for both its theme park operations and the company's investments in entertainment media. Meanwhile, CVS began showing progress in resolving operational problems associated with its acquisition of a major pharmacy benefits manager, a move that had affected the company's shorter-term earnings. 6 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 Q What were some of the changes you made to the Fund's portfolio during the 12 months ended March 31, 2013? A We have recently increased the portfolio's exposure to the energy sector by adding several holdings, including Schlumberger and Cabot Oil and Gas. Schlumberger is one of the world's leading oil services firms and we think the company is well positioned to benefit from industry expansion in the international markets. We believe that Cabot, one of the lowest-cost natural gas producers, has the potential to grow earnings rapidly as natural gas production increases. Meanwhile, we eliminated the Fund's investments in the aforementioned NOV, and integrated oil company ExxonMobil, which we believe has diminished growth prospects. In other sectors, we established a new Fund position in Colgate-Palmolive, the global consumer products company. Colgate-Palmolive has strong brand strength and has been enjoying solid gains in the emerging markets. Q What is your investment outlook? A At the start of a new fiscal year for the Fund, we continue to emphasize portfolio investments in companies that we believe have sustainable business models and good competitive positions in their markets. We particularly favor companies that are able to generate solid cash flows, which can then be reinvested to improve their businesses through internal growth. Although the stock market has posted good gains in the past year, stock prices still appear inexpensive, especially relative to the low rate of inflation and the low level of interest rates. Many major corporations have been reporting solid earnings and we believe should be able to register impressive gains with any improvement in economic growth. We remain somewhat cautious, however, as the economic backdrop remains mixed and uncertain, and external events could exert significant influences on the capital markets. While the markets apparently have navigated past politically-created hurdles at home, such as the "fiscal cliff," a debt-ceiling deadline and budget "sequestration" cuts, we should not become complacent, as we still have not seen the full tangible effects of the spending cuts required under the sequestration scenario. The economy in Europe continues to appear weak, with problems in the peripheral markets beginning to affect the core economies of France and Germany, where Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 7 industrial production has fallen off. Economic conditions no longer appear to be deteriorating in China, however, as domestic consumer consumption is increasing; but we believe it is important to remember that China's most important export customer is Europe, and economic troubles there could have a ripple effect on the country's economy. Overall, we think there is reason for optimism about the equity markets, but investors must remain mindful of the possibility of unexpected pressures arising from anywhere around the globe. 8 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 Please refer to the Schedule of Investments on pages 21-25 for a full listing of Fund 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. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 9 Portfolio Summary | 3/31/13 Portfolio Diversification -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] U.S. Common Stocks 95.2% International Common Stocks 2.8% Temporary Cash Investments 1.0% Depositary Receipts for International Stocks 1.0% Sector Distribution -------------------------------------------------------------------------------- (As a percentage of equity holdings) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Information Technology 31.2% Health Care 17.1% Consumer Staples 15.7% Consumer Discretionary 12.5% Industrials 12.0% Materials 4.7% Energy 4.1% Financials 2.7% 10 Largest Holdings -------------------------------------------------------------------------------- (As a percentage of equity holdings)* 1. Apple, Inc. 6.25% -------------------------------------------------------------------------------- 2. Mastercard, Inc. 5.01 -------------------------------------------------------------------------------- 3. Google, Inc. 4.88 -------------------------------------------------------------------------------- 4. Microsoft Corp. 4.72 -------------------------------------------------------------------------------- 5. Philip Morris International, Inc. 4.18 -------------------------------------------------------------------------------- 6. The Coca-Cola Co. 3.88 -------------------------------------------------------------------------------- 7. Starbucks Corp. 3.67 -------------------------------------------------------------------------------- 8. United Technologies Corp. 3.59 -------------------------------------------------------------------------------- 9. Ross Stores, Inc. 3.54 -------------------------------------------------------------------------------- 10. Oracle Corp. 3.52 -------------------------------------------------------------------------------- * This list excludes temporary cash investments and derivative instruments. The portfolio is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any securities listed. 10 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 Prices and Distributions | 3/31/13 Net Asset Value per Share -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 3/31/13 3/31/12 -------------------------------------------------------------------------------- A $14.33 $13.23 -------------------------------------------------------------------------------- B $13.45 $12.50 -------------------------------------------------------------------------------- C $13.55 $12.57 -------------------------------------------------------------------------------- Y $14.41 $13.30 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 3/31/13 4/2/12 -------------------------------------------------------------------------------- R* $14.25 $13.34 -------------------------------------------------------------------------------- Z* $14.32 $13.34 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 3/31/13 12/20/12 -------------------------------------------------------------------------------- K** $14.30 $13.37 -------------------------------------------------------------------------------- * Class R and Class Z shares were first publicly offered on April 2, 2012. ** Class K shares were first publicly offered on December 20, 2012. Distributions per Share: 4/1/12-3/31/13 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains -------------------------------------------------------------------------------- A $0.0561 $ -- $0.1050 -------------------------------------------------------------------------------- B $ -- $ -- $0.1050 -------------------------------------------------------------------------------- C $0.0077 $ -- $0.1050 -------------------------------------------------------------------------------- K $0.1006 $ -- $ -- -------------------------------------------------------------------------------- R $0.0907 $ -- $0.1050 -------------------------------------------------------------------------------- Y $0.0960 $ -- $0.1050 -------------------------------------------------------------------------------- Z $0.0980 $ -- $0.1050 -------------------------------------------------------------------------------- The Russell 1000 Growth Index is an unmanaged index that measures the performance of large-cap U.S. growth stocks. Index returns 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 12-18. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 11 Performance Update | 3/31/13 Class A Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Fundamental Growth Fund at public offering price, compared to that of the Russell 1000 Growth Index. Average Annual Total Returns (As of March 31, 2013) ------------------------------------------------------------------------------------- Net Asset Public Offering Period Value (NAV) Price (POP) ------------------------------------------------------------------------------------- 10 Years 9.21% 8.56% 5 Years 7.53 6.26 1 Year 9.64 3.32 ------------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 12, 2012) ------------------------------------------------------------------------------------- Gross Net ------------------------------------------------------------------------------------- 1.19% 1.09% ------------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Fundamental Russell 1000 Growth Fund Growth Index 3/31/2003 $ 9,425 $ 10,000 3/31/2004 $ 12,505 $ 13,218 3/31/2005 $ 13,193 $ 13,371 3/31/2006 $ 14,657 $ 15,129 3/31/2007 $ 15,450 $ 16,197 3/31/2008 $ 15,819 $ 16,075 3/31/2009 $ 11,556 $ 10,564 3/31/2010 $ 16,236 $ 15,820 3/31/2011 $ 18,060 $ 18,708 3/31/2012 $ 20,741 $ 20,770 3/31/2013 $ 22,740 $ 22,866 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. NAV results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. POP returns reflect deduction of maximum 5.75% sales charge. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. 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 August 1, 2014, 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. 12 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 Performance Update | 3/31/13 Class B Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Fundamental Growth Fund, compared to that of the Russell 1000 Growth Index. Average Annual Total Returns (As of March 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class 12/15/2005 5.52% 5.52% 5 Years 6.51 6.51 1 Year 8.51 4.51 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 12, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 2.29% 2.15% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Fundamental Russell 1000 Growth Fund Growth Index 12/31/2005 $ 10,000 $ 10,000 3/31/2006 $ 10,379 $ 10,309 3/31/2007 $ 10,846 $ 11,037 3/31/2008 $ 11,010 $ 10,954 3/31/2009 $ 7,972 $ 7,199 3/31/2010 $ 11,088 $ 10,780 3/31/2011 $ 12,226 $ 12,748 3/31/2012 $ 13,909 $ 14,154 3/31/2013 $ 15,093 $ 15,581 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. "If Redeemed" returns reflect the deduction of applicable contingent deferred sales charge (CDSC). The maximum CDSC for Class B shares is 4% and declines over five years. For more complete information, please see the prospectus. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. 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 August 1, 2014, for Class B shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 13 Performance Update | 3/31/13 Class C Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Fundamental Growth Fund, compared to that of the Russell 1000 Growth Index. Average Annual Total Returns (As of March 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class 12/15/2005 5.63% 5.63% 5 Years 6.67 6.67 1 Year 8.77 8.77 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 12, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 1.96% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Fundamental Russell 1000 Growth Fund Growth Index 12/31/2005 $ 10,000 $ 10,000 3/31/2006 $ 10,369 $ 10,309 3/31/2007 $ 10,836 $ 11,037 3/31/2008 $ 11,000 $ 10,954 3/31/2009 $ 7,974 $ 7,199 3/31/2010 $ 11,108 $ 10,780 3/31/2011 $ 12,255 $ 12,748 3/31/2012 $ 13,968 $ 14,154 3/31/2013 $ 15,193 $ 15,581 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Class C shares held for less than one year are also subject to a 1% contingent deferred sales charge (CDSC). "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. 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 Fundamental Growth Fund | Annual Report | 3/31/13 Performance Update | 3/31/13 Class K Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Fundamental Growth Fund, compared to that of the Russell 1000 Growth Index. Average Annual Total Returns (As of March 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 9.22% 9.22% 5 Years 7.56 7.56 1 Year 9.78 9.78 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 12, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 0.71% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Fundamental Russell 1000 Growth Fund Growth Index 3/31/2003 $ 10,000 $ 10,000 3/31/2004 $ 13,270 $ 13,218 3/31/2005 $ 14,000 $ 13,371 3/31/2006 $ 15,554 $ 15,129 3/31/2007 $ 16,395 $ 16,197 3/31/2008 $ 16,787 $ 16,075 3/31/2009 $ 12,264 $ 10,564 3/31/2010 $ 17,230 $ 15,820 3/31/2011 $ 19,165 $ 18,708 3/31/2012 $ 22,010 $ 20,770 3/31/2013 $ 24,162 $ 22,866 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 K shares for the period prior to the commencement of operations of Class K shares on December 20, 2012, is the net asset value performance of the Fund's Class A shares, which has not been restated to reflect any differences in expenses, including Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares generally are higher than those of Class K shares, the performance of Class K shares prior to their inception would have been higher than the performance shown. Class K 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. 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 Fundamental Growth Fund | Annual Report | 3/31/13 15 Performance Update | 3/31/13 Class R Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Fundamental Growth Fund, compared to that of the Russell 1000 Growth Index. Average Annual Total Returns (As of March 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 9.18% 9.18% 5 Years 7.46 7.46 1 Year 9.32 9.32 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 12, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 1.50% 1.40% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Fundamental Russell 1000 Growth Fund Growth Index 3/31/2003 $ 10,000 $ 10,000 3/31/2004 $ 13,270 $ 13,218 3/31/2005 $ 14,000 $ 13,371 3/31/2006 $ 15,554 $ 15,129 3/31/2007 $ 16,395 $ 16,197 3/31/2008 $ 16,787 $ 16,075 3/31/2009 $ 12,264 $ 10,564 3/31/2010 $ 17,230 $ 15,820 3/31/2011 $ 19,165 $ 18,708 3/31/2012 $ 22,010 $ 20,770 3/31/2013 $ 24,060 $ 22,866 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 2, 2012, 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 April 2, 2012, the actual performance of Class R shares is reflected. Class R shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects the contractual expense limitation currently in effect through August 1, 2014, for Class R shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. 16 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 Performance Update | 3/31/13 Class Y Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 million investment made in Pioneer Fundamental Growth Fund, compared to that of the Russell 1000 Growth Index. Average Annual Total Returns (As of March 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 9.38% 9.38% 5 Years 7.87 7.87 1 Year 9.99 9.99 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 12, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 0.78% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $5 Million Investment Pioneer Fundamental Russell 1000 Growth Fund Growth Index 3/31/2003 $ 5,000,000 $ 5,000,000 3/31/2004 $ 6,635,150 $ 6,608,934 3/31/2005 $ 6,999,956 $ 6,685,721 3/31/2006 $ 7,776,986 $ 7,564,426 3/31/2007 $ 8,197,651 $ 8,098,300 3/31/2008 $ 8,393,437 $ 8,037,704 3/31/2009 $ 6,131,749 $ 5,282,054 3/31/2010 $ 8,645,314 $ 7,909,950 3/31/2011 $ 9,668,574 $ 9,353,949 3/31/2012 $ 11,146,698 $ 10,385,167 3/31/2013 $ 12,260,390 $ 11,432,757 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 Y shares for the period prior to the commencement of operations of Class Y shares on April 8, 2009, is the net asset value performance of the Fund's Class A shares, which has not been restated to reflect any differences in expenses, including Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares generally are higher than those of Class Y shares, the performance of Class Y shares prior to their inception would have been higher than the performance 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. 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 Fundamental Growth Fund | Annual Report | 3/31/13 17 Performance Update | 3/31/13 Class Z Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Fundamental Growth Fund, compared to that of the Russell 1000 Growth Index. Average Annual Total Returns (As of March 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 9.24% 9.24% 5 Years 7.58 7.58 1 Year 9.91 9.91 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 12, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 0.95% 0.90% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Fundamental Russell 1000 Growth Fund Growth Index 3/31/2003 $ 10,000 $ 10,000 3/31/2004 $ 13,270 $ 13,218 3/31/2005 $ 14,000 $ 13,371 3/31/2006 $ 15,554 $ 15,129 3/31/2007 $ 16,395 $ 16,197 3/31/2008 $ 16,787 $ 16,075 3/31/2009 $ 12,264 $ 10,564 3/31/2010 $ 17,230 $ 15,820 3/31/2011 $ 19,165 $ 18,708 3/31/2012 $ 22,010 $ 20,770 3/31/2013 $ 24,191 $ 22,866 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 April 2, 2012, 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 April 2, 2012, 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 August 1, 2014, 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. 18 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 Comparing Ongoing Fund Expenses As a shareowner in the Fund, you incur two types of costs: (1) ongoing costs, including management fees, distribution and/or service (12b-1) fees, and other Fund expenses; and (2) transaction costs, including sales charges (loads) on purchase payments. This example is intended to help you understand your ongoing expenses (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. The example is based on an invest- ment 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 Fundamental Growth Fund Based on actual returns from October 1, 2012 through March 31, 2013. -------------------------------------------------------------------------------------------------------- Share Class A B C K R Y Z -------------------------------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 10/1/12** -------------------------------------------------------------------------------------------------------- Ending Account $1,064.26 $1,059.67 $1,059.93 $1,077.70 $1,071.55 $1,066.21 $1,074.91 Value (after expenses) on 3/31/13 -------------------------------------------------------------------------------------------------------- Expenses Paid $ 5.61 $ 11.04 $ 9.81 $ 2.24 $ 7.18 $ 4.17 $ 4.66 During Period* -------------------------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized net expense ratio of 1.09%, 2.15%, 1.91%, 0.77%, 1.39%, 0.81% and 0.90% for Class A, Class B, Class C, Class K, Class R, Class Y and Class Z shares, respectively, multiplied by the average account value over the period, multiplied by 182/365 (102/365 for Class K shares) (to reflect the one-half year period). ** 12/20/12 for Class K shares. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 19 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 Fundamental Growth Fund Based on a hypothetical 5% per year return before expenses, reflecting the period from October 1, 2012 through March 31, 2013. -------------------------------------------------------------------------------------------------------- Share Class A B C K R Y Z -------------------------------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 10/1/12** -------------------------------------------------------------------------------------------------------- Ending Account $1,019.50 $1,014.21 $1,015.41 $1,011.82 $1,018.00 $1,020.89 $1,020.44 Value (after expenses) on 3/31/13 -------------------------------------------------------------------------------------------------------- Expenses Paid $ 5.49 $ 10.80 $ 9.60 $ 2.16 $ 6.99 $ 4.08 $ 4.53 During Period* -------------------------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized net expense ratio of 1.09%, 2.15%, 1.91%, 0.77%, 1.39%, 0.81% and 0.90% for Class A, Class B, Class C, Class K, Class R, Class Y and Class Z shares, respectively, multiplied by the average account value over the period, multiplied by 182/365 (102/365 for Class K shares) (to reflect the one-half year period). ** 12/20/12 for Class K shares. 20 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 Schedule of Investments | 3/31/13 --------------------------------------------------------------------------------------- Shares Value --------------------------------------------------------------------------------------- COMMON STOCKS -- 98.2% ENERGY -- 4.1% Oil & Gas Equipment & Services -- 2.0% 284,950 Schlumberger, Ltd. $ 21,339,906 --------------------------------------------------------------------------------------- Integrated Oil & Gas -- 1.1% 150,120 Occidental Petroleum Corp. $ 11,764,904 --------------------------------------------------------------------------------------- Oil & Gas Exploration & Production -- 1.0% 167,700 Cabot Oil & Gas Corp. $ 11,338,197 -------------- Total Energy $ 44,443,007 --------------------------------------------------------------------------------------- MATERIALS -- 4.7% Fertilizers & Agricultural Chemicals -- 1.3% 139,305 Monsanto Co. $ 14,714,787 --------------------------------------------------------------------------------------- Industrial Gases -- 1.5% 144,310 Praxair, Inc. $ 16,096,337 --------------------------------------------------------------------------------------- Specialty Chemicals -- 1.9% 256,060 Ecolab, Inc. $ 20,530,891 -------------- Total Materials $ 51,342,015 --------------------------------------------------------------------------------------- CAPITAL GOODS -- 9.3% Aerospace & Defense -- 3.5% 410,915 United Technologies Corp. $ 38,391,788 --------------------------------------------------------------------------------------- Industrial Conglomerates -- 3.4% 345,565 3M Co. $ 36,737,015 --------------------------------------------------------------------------------------- Construction & Farm Machinery & Heavy Trucks -- 1.3% 123,650 Cummins, Inc. $ 14,319,906 --------------------------------------------------------------------------------------- Trading Companies & Distributors -- 1.1% 51,350 WW Grainger, Inc. $ 11,552,723 -------------- Total Capital Goods $ 101,001,432 --------------------------------------------------------------------------------------- TRANSPORTATION -- 2.5% Air Freight & Logistics -- 2.5% 320,470 United Parcel Service, Inc. (Class B) $ 27,528,373 -------------- Total Transportation $ 27,528,373 --------------------------------------------------------------------------------------- CONSUMER SERVICES -- 3.6% Restaurants -- 3.6% 689,200 Starbucks Corp. $ 39,256,832 -------------- Total Consumer Services $ 39,256,832 --------------------------------------------------------------------------------------- MEDIA -- 2.8% Movies & Entertainment -- 2.8% 536,550 The Walt Disney Co. $ 30,476,040 -------------- Total Media $ 30,476,040 --------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 21 Schedule of Investments | 3/31/13 (continued) --------------------------------------------------------------------------------------- Shares Value --------------------------------------------------------------------------------------- RETAILING -- 5.9% Apparel Retail -- 3.5% 624,700 Ross Stores, Inc. $ 37,869,314 --------------------------------------------------------------------------------------- Home Improvement Retail -- 2.4% 384,750 The Home Depot, Inc. $ 26,847,855 -------------- Total Retailing $ 64,717,169 --------------------------------------------------------------------------------------- FOOD & STAPLES RETAILING -- 3.4% Drug Retail -- 3.4% 672,130 CVS Caremark Corp. $ 36,960,429 -------------- Total Food & Staples Retailing $ 36,960,429 --------------------------------------------------------------------------------------- FOOD, BEVERAGE & TOBACCO -- 9.0% Soft Drinks -- 4.9% 100,580 Fomento Economico Mexicano SAB de CV (A.D.R.) $ 11,415,830 1,025,800 The Coca-Cola Co. 41,483,352 -------------- $ 52,899,182 --------------------------------------------------------------------------------------- Tobacco -- 4.1% 483,080 Philip Morris International, Inc. $ 44,786,347 -------------- Total Food, Beverage & Tobacco $ 97,685,529 --------------------------------------------------------------------------------------- HOUSEHOLD & PERSONAL PRODUCTS -- 3.1% Household Products -- 3.1% 162,900 Colgate-Palmolive Co. $ 19,227,087 192,620 The Procter & Gamble Co. 14,843,297 -------------- $ 34,070,384 -------------- Total Household & Personal Products $ 34,070,384 --------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 7.1% Health Care Equipment -- 2.8% 447,190 Covidien Plc $ 30,337,370 --------------------------------------------------------------------------------------- Health Care Services -- 4.3% 290,220 DaVita HealthCare Partners, Inc.* $ 34,417,190 227,210 Express Scripts Holding Co.* 13,098,656 -------------- $ 47,515,846 -------------- Total Health Care Equipment & Services $ 77,853,216 --------------------------------------------------------------------------------------- PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 9.7% Biotechnology -- 3.3% 237,156 Celgene Corp.* $ 27,488,752 150,400 Vertex Pharmaceuticals, Inc.* 8,268,992 -------------- $ 35,757,744 --------------------------------------------------------------------------------------- Pharmaceuticals -- 3.2% 315,930 Allergan, Inc. $ 35,267,266 --------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 22 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 --------------------------------------------------------------------------------------- Shares Value --------------------------------------------------------------------------------------- Life Sciences Tools & Services -- 3.2% 453,880 Thermo Fisher Scientific, Inc. $ 34,717,281 -------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 105,742,291 --------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 1.6% Specialized Finance -- 1.6% 104,845 IntercontinentalExchange, Inc.* $ 17,097,074 -------------- Total Diversified Financials $ 17,097,074 --------------------------------------------------------------------------------------- INSURANCE -- 0.8% Property & Casualty Insurance -- 0.8% 325,680 The Progressive Corp. $ 8,229,934 -------------- Total Insurance $ 8,229,934 --------------------------------------------------------------------------------------- SOFTWARE & SERVICES -- 17.8% Internet Software & Services -- 4.8% 65,800 Google, Inc.* $ 52,247,174 --------------------------------------------------------------------------------------- Data Processing & Outsourced Services -- 4.9% 99,120 Mastercard, Inc. $ 53,636,806 --------------------------------------------------------------------------------------- Systems Software -- 8.1% 1,766,670 Microsoft Corp. $ 50,544,429 1,166,520 Oracle Corp. 37,725,257 -------------- $ 88,269,686 -------------- Total Software & Services $ 194,153,666 --------------------------------------------------------------------------------------- TECHNOLOGY HARDWARE & EQUIPMENT -- 9.1% Communications Equipment -- 3.0% 482,070 Qualcomm, Inc. $ 32,274,586 --------------------------------------------------------------------------------------- Computer Hardware -- 6.1% 151,265 Apple, Inc. $ 66,954,427 -------------- Total Technology Hardware & Equipment $ 99,229,013 --------------------------------------------------------------------------------------- SEMICONDUCTORS & SEMICONDUCTOR EQUIPMENT -- 3.7% Semiconductors -- 3.7% 236,000 Analog Devices, Inc. $ 10,971,640 370,250 Maxim Integrated Products, Inc. 12,088,662 462,480 Xilinx, Inc. 17,652,862 -------------- $ 40,713,164 -------------- Total Semiconductors & Semiconductor Equipment $ 40,713,164 --------------------------------------------------------------------------------------- TOTAL COMMON STOCKS (Cost $822,473,878) $1,070,499,568 --------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 23 Schedule of Investments | 3/31/13 (continued) --------------------------------------------------------------------------------------- Principal Amount ($) Value --------------------------------------------------------------------------------------- TEMPORARY CASH INVESTMENTS -- 0.9% Repurchase Agreement -- 0.9% 10,000,000 Bank of Nova Scotia, Inc., 0.19%, dated 3/28/13, repurchase price of $10,000,000 plus accrued interest on 4/1/13 collateralized by $10,200,054 Federal National Mortgage Association, 3.0-3.5%, 8/1/42-12-1-42 $ 10,000,000 --------------------------------------------------------------------------------------- TOTAL TEMPORARY CASH INVESTMENTS (Cost $10,000,000) $ 10,000,000 --------------------------------------------------------------------------------------- TOTAL INVESTMENT IN SECURITIES -- 99.1% (Cost $832,473,878) (a) $1,080,499,568 --------------------------------------------------------------------------------------- OTHER ASSETS & LIABILITIES -- 0.9% $ 9,525,253 --------------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $1,090,024,821 ======================================================================================= * Non-income producing security. (A.D.R.) American Depositary Receipts. (a) At March 31, 2013, the net unrealized appreciation on investments based on cost for federal income tax purposes of $834,563,689 was as follows: Aggregate gross unrealized appreciation for all investments in which there is an excess of value over tax cost $ 249,960,008 Aggregate gross unrealized depreciation for all investments in which there is an excess of tax cost over value (4,024,129) ------------- Net unrealized appreciation $ 245,935,879 ============= Purchases and sales of securities (excluding temporary cash investments) for the year ended March 31, 2013 aggregated $466,626,045 and $257,226,695, respectively. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. Level 1 - quoted prices in active markets for identical securities. Level 2 - other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.) See Notes to Financial Statements -- Note 1A. Level 3 - significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) See Notes to Financial Statements -- Note 1A. 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. 24 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 The following is a summary of the inputs used as of March 31, 2013, in valuing the Fund's investments: -------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total -------------------------------------------------------------------------------- Common Stocks $1,070,499,568 $ -- $ -- $1,070,499,568 Repurchase Agreement -- 10,000,000 -- 10,000,000 -------------------------------------------------------------------------------- Total $1,070,499,568 $10,000,000 $ -- $1,080,499,568 ================================================================================ During the year ended March 31, 2013, there were no transfers between Levels 1, 2 and 3. The accompanying notes are an integral part of these financial statements. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 25 Statement of Assets and Liabilities | 3/31/13 ASSETS: Investment in securities (cost $832,473,878) $1,080,499,568 Cash 26,825,696 Receivables -- Investment securities sold 10,400,362 Fund shares sold 5,383,672 Dividends and interest 1,016,051 Due from Pioneer Investment Management, Inc. 306,791 Other 54,498 -------------------------------------------------------------------------------- Total assets $1,124,486,638 ================================================================================ LIABILITIES: Payables -- Investment securities purchased $ 27,199,150 Fund shares repurchased 6,912,756 Due to affiliates 201,897 Accrued expenses 148,014 -------------------------------------------------------------------------------- Total liabilities $ 34,461,817 ================================================================================ NET ASSETS: Paid-in capital $ 816,411,684 Undistributed net investment income 1,210,759 Accumulated net realized gain on investments 24,376,688 Net unrealized appreciation on investments 248,025,690 -------------------------------------------------------------------------------- Total net assets $1,090,024,821 ================================================================================ NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Class A (based on $436,681,995/30,474,061 shares) $ 14.33 Class B (based on $3,128,471/232,682 shares) $ 13.45 Class C (based on $89,298,600/6,589,394 shares) $ 13.55 Class K (based on $10,693/748 shares) $ 14.30 Class R (based on $2,436,748/171,008 shares) $ 14.25 Class Y (based on $558,383,049/38,759,051 shares) $ 14.41 Class Z (based on $85,265/5,955 shares) $ 14.32 MAXIMUM OFFERING PRICE: Class A ($14.33 (divided by) 94.25%) $ 15.20 ================================================================================ The accompanying notes are an integral part of these financial statements. 26 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 Statement of Operations For the Year Ended 3/31/13 INVESTMENT INCOME: Dividends (net of foreign taxes withheld of $28,822) $ 15,639,310 Interest 31,563 -------------------------------------------------------------------------------------------- Total investment income $ 15,670,873 ============================================================================================ EXPENSES: Management fees $ 6,151,626 Transfer agent fees Class A 240,472 Class B 11,472 Class C 34,898 Class R 464 Class Y 10,102 Class Z 85 Distribution fees Class A 941,095 Class B 30,623 Class C 565,651 Class R 2,613 Shareholder communications expense 1,028,000 Administrative reimbursements 281,328 Custodian fees 27,962 Registration fees 225,949 Professional fees 121,261 Printing expense 78,088 Fees and expenses of nonaffiliated Trustees 36,080 Miscellaneous 47,378 -------------------------------------------------------------------------------------------- Total expenses $ 9,835,147 Less fees waived and expenses reimbursed by Pioneer Investment Management, Inc. (411,640) -------------------------------------------------------------------------------------------- Net expenses $ 9,423,507 -------------------------------------------------------------------------------------------- Net investment income $ 6,247,366 -------------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN ON INVESTMENTS AND CLASS ACTIONS: Net realized gain on: Investments $ 25,554,635 Class actions 20,775 $ 25,575,410 -------------------------------------------------------------------------------------------- Change in net unrealized appreciation on investments $ 70,664,284 -------------------------------------------------------------------------------------------- Net gain on investments $ 96,239,694 -------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $102,487,060 ============================================================================================ The accompanying notes are an integral part of these financial statements. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 27 Statements of Changes in Net Assets -------------------------------------------------------------------------------------------------- Year Ended Year Ended 3/31/13 3/31/12 -------------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income $ 6,247,366 $ 2,075,948 Net realized gain on investments and class actions 25,575,410 13,832,845 Change in net unrealized appreciation on investments 70,664,284 69,418,797 -------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 102,487,060 $ 85,327,590 -------------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Net investment income: Class A ($0.06 and $0.03 per share, respectively) $ (1,650,780) $ (487,169) Class C ($0.01 and $0.00 per share, respectively) (41,357) -- Class K ($0.10 and $0.00 per share, respectively) (75) -- Class R ($0.09 and $0.00 per share, respectively) (5,884) -- Class Y ($0.10 and $0.07 per share, respectively) (3,985,154) (1,318,638) Class Z ($0.10 and $0.00 per share, respectively) (556) -- Net realized gain: Class A ($0.11 and $0.30 per share, respectively) (2,968,572) (4,746,151) Class B ($0.11 and $0.30 per share, respectively) (24,208) (87,881) Class C ($0.11 and $0.30 per share, respectively) (532,125) (539,842) Class R ($0.11 and $0.00 per share, respectively) (1,919) -- Class Y ($0.11 and $0.30 per share, respectively) (4,331,818) (5,958,549) Class Z ($0.11 and $0.00 per share, respectively) (154) -- -------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (13,542,602) $ (13,138,230) ================================================================================================== FROM FUND SHARE TRANSACTIONS: Net proceeds from sale or exchange of shares $ 598,340,916 $ 432,147,397 Reinvestment of distributions 12,336,661 8,177,366 Cost of shares repurchased (397,360,188) (93,643,390) -------------------------------------------------------------------------------------------------- Net increase in net assets resulting from Fund share transactions $ 213,317,389 $ 346,681,373 -------------------------------------------------------------------------------------------------- Net increase in net assets $ 302,261,847 $ 418,870,733 NET ASSETS: Beginning of year 787,762,974 368,892,241 -------------------------------------------------------------------------------------------------- End of year $1,090,024,821 $ 787,762,974 -------------------------------------------------------------------------------------------------- Undistributed net investment income $ 1,210,759 $ 647,199 ================================================================================================== The accompanying notes are an integral part of these financial statements. 28 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 Statements of Changes in Net Assets ------------------------------------------------------------------------------------------------ '13 Shares '13 Amount '12 Shares '12 Amount ------------------------------------------------------------------------------------------------ Class A Shares sold 17,626,103 $ 234,747,570 19,396,234 $ 234,741,946 Reinvestment of distributions 336,370 4,440,108 418,234 4,691,030 Less shares repurchased (13,717,812) (181,951,822) (3,982,787) (47,524,046) ------------------------------------------------------------------------------------------------ Net increase 4,244,661 $ 57,235,856 15,831,681 $ 191,908,930 ================================================================================================ Class B Shares sold or exchanged 76,913 $ 971,467 100,515 $ 1,125,814 Reinvestment of distributions 1,784 22,092 7,205 76,090 Less shares repurchased (118,631) (1,480,233) (191,777) (2,156,277) ------------------------------------------------------------------------------------------------ Net decrease (39,934) $ (486,674) (84,057) $ (954,373) ================================================================================================ Class C Shares sold 4,626,989 $ 58,688,461 1,692,846 $ 19,363,891 Reinvestment of distributions 37,216 464,180 39,795 422,711 Less shares repurchased (769,831) (9,743,291) (373,086) (4,218,195) ------------------------------------------------------------------------------------------------ Net increase 3,894,374 $ 49,409,350 1,359,555 $ 15,568,407 ================================================================================================ Class K* Shares sold 748 $ 10,000 -- $ -- Reinvestment of distributions -- -- -- -- Less shares repurchased -- -- -- -- ------------------------------------------------------------------------------------------------ Net increase 748 $ 10,000 -- $ -- ================================================================================================ Class R** Shares sold 181,346 $ 2,466,995 -- $ -- Reinvestment of distributions 473 6,220 -- -- Less shares repurchased (10,811) (151,184) -- -- ------------------------------------------------------------------------------------------------ Net increase 171,008 $ 2,322,031 -- $ -- ================================================================================================ Class Y Shares sold 22,663,768 $ 301,376,832 14,339,090 $ 176,915,746 Reinvestment of distributions 557,257 7,403,503 263,491 2,987,535 Less shares repurchased (14,798,807) (204,032,532) (3,283,465) (39,744,872) ------------------------------------------------------------------------------------------------ Net increase 8,422,218 $ 104,747,803 11,319,116 $ 140,158,409 ================================================================================================ Class Z** Shares sold 5,992 $ 79,591 -- $ -- Reinvestment of distributions 42 558 -- -- Less shares repurchased (79) (1,126) -- -- ------------------------------------------------------------------------------------------------ Net increase 5,955 $ 79,023 -- $ -- ================================================================================================ * Class K shares were first publicly offered on December 20, 2012. ** Class R and Class Z shares were first publicly offered on April 2, 2012. The accompanying notes are an integral part of these financial statements. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 29 Financial Highlights ------------------------------------------------------------------------------------------------------------------------------- Year Year Year Year Year Ended Ended Ended Ended Ended 3/31/13 3/31/12 3/31/11 3/31/10 3/31/09 ------------------------------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of period $ 13.23 $ 11.86 $ 10.96 $ 8.25 $ 11.32 ------------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income $ 0.07 $ 0.02 $ 0.03 $ 0.02 $ 0.01 Net realized and unrealized gain (loss) on investments 1.20 1.68 1.17 3.29 (3.06) ------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets from investment operations $ 1.27 $ 1.70 $ 1.20 $ 3.31 $ (3.05) ------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.06) (0.03) (0.02) (0.02) -- Net realized gain (0.11) (0.30) (0.28) (0.58) (0.02) ------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 1.10 $ 1.37 $ 0.90 $ 2.71 $ (3.07) ------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 14.33 $ 13.23 $ 11.86 $ 10.96 $ 8.25 =============================================================================================================================== Total return* 9.64% 14.84% 11.23% 40.50% (26.95)% Ratio of net expenses to average net assets+ 1.09% 1.19% 1.25% 1.25% 1.25% Ratio of net investment income to average net assets+ 0.54% 0.28% 0.25% 0.14% 0.24% Portfolio turnover rate 28% 16% 18% 45% 27% Net assets, end of period (in thousands) $436,682 $346,987 $123,305 $117,218 $ 6,720 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reductions for fees paid indirectly: Total expenses 1.20% 1.19% 1.28% 1.47% 3.94% Net investment income (loss) 0.43% 0.28% 0.22% (0.07)% (2.45)% Ratios with waiver of fees and assumption of expenses by the Adviser and reductions for fees paid indirectly: Net expenses 1.09% 1.19% 1.25% 1.25% 1.25% Net investment income 0.54% 0.28% 0.25% 0.14% 0.24% =============================================================================================================================== * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. + Ratios with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. 30 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 ------------------------------------------------------------------------------------------------------------------------------------ Year Year Year Year Year Ended Ended Ended Ended Ended 3/31/13 3/31/12 3/31/11 3/31/10 3/31/09 ------------------------------------------------------------------------------------------------------------------------------------ Class B Net asset value, beginning of period $ 12.50 $ 11.30 $ 10.53 $ 8.01 $ 11.09 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment loss $ (0.07)(a) $ (0.09) $ (0.07)(a) $ (0.05)(a) $ (0.04) Net realized and unrealized gain (loss) on investments 1.13 1.59 1.12 3.15 (3.02) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net assets from investment operations $ 1.06 $ 1.50 $ 1.05 $ 3.10 $ (3.06) ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net realized gain (0.11) (0.30) (0.28) (0.58) (0.02) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 0.95 $ 1.20 $ 0.77 $ 2.52 $ (3.08) ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 13.45 $ 12.50 $ 11.30 $ 10.53 $ 8.01 ==================================================================================================================================== Total return* 8.51%(b) 13.77% 10.26% 39.09% (27.60)% Ratio of net expenses to average net assets+ 2.15% 2.15% 2.15% 2.15% 2.16% Ratio of net investment income to average net assets+ (0.53)% (0.71)% (0.65)% (0.71)% (0.67)% Portfolio turnover rate 28% 16% 18% 45% 27% Net assets, end of period (in thousands) $ 3,128 $ 3,407 $ 4,029 $ 4,114 $ 1,169 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reductions for fees paid indirectly: Total expenses 2.26% 2.29% 1.28% 2.53% 4.85% Net investment loss (0.64)% (0.85)% (0.73)% (1.09)% (3.36)% Ratios with waiver of fees and assumption of expenses by the Adviser and reductions for fees paid indirectly: Net expenses 2.15% 2.15% 2.15% 2.15% 2.15% Net investment loss (0.53)% (0.71)% (0.65)% (0.71)% (0.66)% ==================================================================================================================================== (a) The amount shown for a share outstanding does not correspond with the aggregate gain on investments for the period due to the timing of sales and repurchases of shares in relation to fluctuating fair values of the investments of the Fund. (b) If the Fund had not recognized gains in the settlement of class action lawsuits during the year ended March 31, 2013, the total return would have been 8.47%. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. + Ratios with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 31 Financial Highlights (continued) ------------------------------------------------------------------------------------------------------------------------------------ Year Year Year Year Year Ended Ended Ended Ended Ended 3/31/13 3/31/12 3/31/11 3/31/10 3/31/09 ------------------------------------------------------------------------------------------------------------------------------------ Class C Net asset value, beginning of period $ 12.57 $ 11.34 $ 10.56 $ 8.02 $ 11.09 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment loss $ (0.02)(a) $ (0.04) $ (0.05)(a) $ (0.04)(a) $ (0.02) Net realized and unrealized gain (loss) on investments 1.12 1.57 1.11 3.16 (3.03) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net assets from investment operations $ 1.10 $ 1.53 $ 1.06 $ 3.12 $ (3.05) ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income (0.01) -- -- -- -- Net realized gain (0.11) (0.30) (0.28) (0.58) (0.02) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 0.98 $ 1.23 $ 0.78 $ 2.54 $ (3.07) ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 13.55 $ 12.57 $ 11.34 $ 10.56 $ 8.02 ==================================================================================================================================== Total return* 8.77% 13.98% 10.33% 39.29% (27.51)% Ratio of net expenses to average net assets+ 1.91% 1.96% 2.03% 2.15% 2.15% Ratio of net investment loss to average net assets+ (0.23)% (0.50)% (0.52)% (0.72)% (0.65)% Portfolio turnover rate 28% 16% 18% 45% 27% Net assets, end of period (in thousands) $89,299 $33,880 $15,149 $11,331 $ 1,187 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reductions for fees paid indirectly: Total expenses 1.91% 1.96% 2.03% 2.31% 4.95% Net investment income (loss) (0.23)% (0.50)% (0.52)% (0.88)% (3.45)% Ratios with waiver of fees and assumption of expenses by the Adviser and reductions for fees paid indirectly: Net expenses 1.91% 1.96% 2.03% 2.15% 2.15% Net investment income (0.23)% (0.50)% (0.52)% (0.72)% (0.65)% ==================================================================================================================================== (a) The amount shown for a share outstanding does not correspond with the aggregate gain on investments for the period due to the timing of sales and repurchases of shares in relation to fluctuating fair values of the investments of the Fund. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. + Ratios with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. 32 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 -------------------------------------------------------------------------------------- 12/20/12 (a) to 3/31/13 -------------------------------------------------------------------------------------- Class K Net asset value, beginning of period $13.37 -------------------------------------------------------------------------------------- Increase from investment operations: Net investment income $ 0.03 Net realized and unrealized gain on investments 1.00 -------------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 1.03 -------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.10) -------------------------------------------------------------------------------------- Net increase in net asset value $ 0.93 -------------------------------------------------------------------------------------- Net asset value, end of period $14.30 ====================================================================================== Total return* 7.77%(b)(c) Ratio of net expenses to average net assets+ 0.77%** Ratio of net investment income to average net assets+ 0.77%** Portfolio turnover rate 28%** Net assets, end of period (in thousands) $ 11 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Total expenses 0.77%** Net investment income 0.77%** Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.77%** Net investment income 0.77%** ====================================================================================== (a) Class K shares were first publicly offered on December 20, 2012. (b) If the Fund had not recognized gains in settlement of class action lawsuits during the year ended March 31, 2013, the total return would have been 7.74%. (c) 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. The accompanying notes are an integral part of these financial statements. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 33 Financial Highlights (continued) -------------------------------------------------------------------------------------- 4/2/12 (a) to 3/31/13 -------------------------------------------------------------------------------------- Class R Net asset value, beginning of period $13.34 -------------------------------------------------------------------------------------- Increase from investment operations: Net investment income $ 0.06 Net realized and unrealized gain on investments 1.05 -------------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 1.11 -------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.09) Net realized gain (0.11) -------------------------------------------------------------------------------------- Net increase in net asset value $ 0.91 -------------------------------------------------------------------------------------- Net asset value, end of period $14.25 ====================================================================================== Total return* 8.42%(b)(c) Ratio of net expenses to average net assets+ 1.40%** Ratio of net investment income to average net assets+ 0.27%** Portfolio turnover rate 28%** Net assets, end of period (in thousands) $2,437 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Total expenses 1.45%** Net investment income 0.21%** Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.40%** Net investment income 0.27%** ====================================================================================== (a) Class R shares were first publicly offered on April 2, 2012. (b) If the Fund had not recognized gains in settlement of class action lawsuits during the year ended March 31, 2013, the total return would have been 8.41%. (c) 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. The accompanying notes are an integral part of these financial statements. 34 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 ------------------------------------------------------------------------------------------------------------------------- Year Year Year Ended Ended Ended 4/8/09 (a) 3/31/13 3/31/12 3/31/11 to 3/31/10 ------------------------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 13.30 $ 11.91 $ 10.99 $ 8.40 ------------------------------------------------------------------------------------------------------------------------- Increase from investment operations: Net investment loss $ 0.10 $ 0.07 $ 0.08 $ 0.03 Net realized and unrealized gain on investments 1.22 1.69 1.19 3.17 ------------------------------------------------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 1.32 $ 1.76 $ 1.27 $ 3.20 ------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.10) (0.07) (0.07) (0.03) Net realized gain (0.11) (0.30) (0.28) (0.58) ------------------------------------------------------------------------------------------------------------------------- Net increase in net asset value $ 1.11 $ 1.39 $ 0.92 $ 2.59 ------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 14.41 $ 13.30 $ 11.91 $ 10.99 ========================================================================================================================= Total return* 9.99%(c) 15.29% 11.84% 38.49%(b) Ratio of net expenses to average net assets+ 0.81% 0.78% 0.78% 0.89%** Ratio of net investment income to average net assets+ 0.85% 0.67% 0.72% 0.46%** Portfolio turnover rate 28% 16% 18% 45%(b) Net assets, end of period (in thousands) $558,383 $403,490 $226,409 $238,017 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reductions for fees paid indirectly: Total expenses 0.81% 0.78% 0.78% 0.97%** Net investment income 0.85% 0.67% 0.72% 0.38%** Ratios with waiver of fees and assumption of expenses by the Adviser and reductions for fees paid indirectly: Net expenses 0.81% 0.78% 0.78% 0.89%** Net investment income 0.85% 0.67% 0.72% 0.46%** ========================================================================================================================= (a) Class Y shares were first publicly offered on April 8, 2009. (b) Not annualized. (c) If the Fund had not recognized gains in settlement of class action lawsuits during the year ended March 31, 2013, the total return would have been 9.96%. * 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 Fundamental Growth Fund | Annual Report | 3/31/13 35 Financial Highlights (continued) -------------------------------------------------------------------------------- 4/2/12 (a) to 3/31/13 -------------------------------------------------------------------------------- Class Z Net asset value, beginning of period $13.34 -------------------------------------------------------------------------------- Increase from investment operations: Net investment income $ 0.05 Net realized and unrealized gain on investments 1.14 -------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 1.19 -------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.10) Net realized gain (0.11) -------------------------------------------------------------------------------- Net increase in net asset value $ 0.98 -------------------------------------------------------------------------------- Net asset value, end of period $14.32 ================================================================================ Total return* 9.00%(b)(c) Ratio of net expenses to average net assets+ 0.90%** Ratio of net investment income to average net assets+ 0.73%** Portfolio turnover rate 28%** Net assets, end of period (in thousands) $ 85 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Total expenses 1.04%** Net investment income 0.59%** Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.90%** Net investment income 0.73%** ================================================================================ (a) Class Z shares were first publicly offered on April 2, 2012. (b) If the Fund had not recognized gains in settlement of class action lawsuits during the year ended March 31, 2013, the total return would have been 8.99%. (c) 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. The accompanying notes are an integral part of these financial statements. 36 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 Notes to Financial Statements | 3/31/13 1. Organization and Significant Accounting Policies Pioneer Fundamental Growth Fund (the Fund) is a series of Pioneer Series Trust X, a Delaware statutory trust. The Fund is registered under the Investment Company Act of 1940 as a diversified, open-end management investment company. The Fund's investment objective is to seek long-term capital growth. The Fund offers seven classes of shares designated as Class A, Class B, Class C, Class K, Class R, Class Y and Class Z shares. Class Y shares were first publicly offered on April 8, 2009. Class R and Class Z shares were first publicly offered on April 2, 2012. Class K shares were first publicly offered on December 20, 2012. 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 K, 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. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 37 The following is a summary of significant accounting policies followed by the Fund in the preparation of its financial statements, which are consistent with those policies generally accepted in the investment company industry: A. Security Valuation Security transactions are recorded as of trade date. The net asset value of the Fund is computed once daily, on each day the New York Stock Exchange (NYSE) is open, as of the close of regular trading on the NYSE. In computing the net asset value, securities that have traded on an exchange are valued at the last sale price on the principal exchange where they are traded. Securities that have not traded on the date of valuation, or securities for which sale prices are not available, generally are valued at the mean between the last bid and asked prices. Short-term fixed income securities with remaining maturities of sixty days or less generally are valued at amortized cost. Shares of money market mutual funds are valued at their net asset value. Trading in foreign securities is substantially completed each day at various times prior to the close of the NYSE. The values of such securities used in computing the net asset value of the Fund's shares are determined as of such times. Securities for which 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 by or at the direction or with the approval of the Valuation Committee using fair value methods pursuant to procedures adopted by the Board of Trustees. The Valuation Committee is comprised of certain members of 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 significantly from exchange prices and such differences could be material. Pioneer Investment Management, Inc. (PIM) is responsible for monitoring developments that may impact fair valued securities and for discussing and assessing fair values on an ongoing basis, and at least quarterly, with the Valuation Committee. At March 31, 2013, there were no securities that were valued using fair value methods (other than securities that were valued using prices supplied by independent pricing services). Inputs used when applying fair value methods to value a security may include credit ratings, the financial condition of the company, current market conditions and comparable securities. 38 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 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 provision for federal income taxes is required. As of March 31, 2013, the Fund did not have any interest and penalties related to uncertain tax positions, which, if applicable, would be recorded as an income tax expense in the Statement of Operations. Tax years for the prior three fiscal years are subject to examination by Federal and State tax authorities. The amount and character of income and capital gain distributions to shareowners are determined in accordance with federal income tax rules, which may differ from U.S. generally accepted accounting principles. Distributions in excess of net investment income or net realized gains are temporary overdistributions for financial statement purposes resulting from differences in the recognition or classification of income or distributions for financial statement and tax purposes. Capital accounts within the financial statements are adjusted for permanent book/tax differences to reflect tax character, but are not adjusted for temporary differences. The tax character of distributions paid during the years ended March 31, 2013 and March 31, 2012 was as follows: ---------------------------------------------------------------------------- 2013 2012 ---------------------------------------------------------------------------- Distributions paid from: Ordinary income $ 5,683,806 $ 1,805,807 Long-term capital gain 7,858,796 11,332,423 ---------------------------------------------------------------------------- Total $13,542,602 $13,138,230 ============================================================================ Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 39 The following shows the components of distributable earnings on a federal income tax basis at March 31, 2013: ---------------------------------------------------------------------------- 2013 ---------------------------------------------------------------------------- Distributable earnings: Undistributed ordinary income $ 1,210,759 Undistributed long-term gain 26,466,499 Net unrealized appreciation 245,935,879 ---------------------------------------------------------------------------- Total $273,613,137 ============================================================================ The difference between book-basis and tax-basis net unrealized appreciation is attributable to the tax deferral of losses on wash sales. C. Fund Shares The Fund records sales and repurchases of its shares as of trade date. Pioneer Funds Distributor, Inc. (PFD), the principal underwriter for the Fund and a wholly-owned indirect subsidiary of UniCredit S.p.A. (UniCredit), earned $142,708 in underwriting commissions on the sale of Class A shares during the year ended March 31, 2013. 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 year ended March 31, 2013, the Fund recognized gains of $20,775 in the 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). Distributions to shareowners are recorded as of the ex-dividend date. Distributions paid by the Fund with respect to each class of shares are calculated in the same manner and at the same time, except that net investment income dividends to Class A, Class B, Class C, Class R, Class Y and Class Z shares can reflect different transfer agent and distribution expense rates. 40 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 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. 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. PIM is responsible for determining that the value of the collateral remains at least equal to the repurchase price. 2. Management Agreement PIM, a wholly-owned indirect subsidiary of UniCredit, manages the Fund's portfolio. Management fees are calculated daily at the annual rate of 0.65% of the Fund's average daily net assets up to $1 billion and 0.60% on assets over $1 billion. For the year ended March 31, 2013, the effective management fee (excluding waivers and/or assumption of expenses) was equivalent to 0.65% 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 1.09%, 2.15%, 2.15%, 1.40% and 0.90% of the average daily net assets attributable to Class A, Class B, Class C, Class R and Class Z shares, respectively. Class Y shares do not have an expense limitation. Fees waived and expenses reimbursed during the year ended March 31, 2013 are reflected on the Statement of Operations. These expense limitations are in effect through August 1, 2014. There can be no assurance that PIM will extend the expense limitation agreement for a class of shares beyond the date referred to above. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 41 Prior to August 1, 2012, PIM contractually agreed to limit ordinary operating expenses of Class A shares to 1.25% of average daily net assets. In addition, under the management and administration agreements, certain other services and costs, including accounting, regulatory reporting and insurance premiums, are paid by the Fund as administrative reimbursements. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $112,783 in management fees, administrative costs and certain other reimbursements payable to PIM at March 31, 2013. 3. Transfer Agent PIMSS, a wholly owned indirect subsidiary of UniCredit, provides substantially all transfer agent and shareowner services to the Fund at negotiated rates. In addition, the Fund reimburses PIMSS for out-of-pocket expenses incurred by PIMSS related to shareholder communications activities such as proxy and statement mailings, outgoing phone calls and omnibus relationship contracts. For the year ended March 31, 2013, such out-of-pocket expenses by class of shares were as follows: -------------------------------------------------------------------------------- Shareholder Communications: -------------------------------------------------------------------------------- Class A $ 575,558 Class B 4,582 Class C 60,595 Class R 350 Class Y 386,909 Class Z 6 -------------------------------------------------------------------------------- Total $1,028,000 ================================================================================ Included in "Due from affiliates" reflected on the Statement of Assets and Liabilities is $61,519 in transfer agent fees and out-of-pocket reimbursements payable to PIMSS at March 31, 2013. 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 42 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 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 $27,595 in distribution fees payable to PFD at March 31, 2013. 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 K, 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 K, Class R, Class Y or Class Z shares. Proceeds from the CDSCs are paid to PFD. For the year ended March 31, 2013, CDSCs in the amount of $39,947 were paid to PFD. 5. Expense Offset Arrangements The Fund has entered into certain expense offset arrangements with PIMSS which may result in a reduction in the Fund's total expenses due to interest earned on cash held by PIMSS. For the year ended March 31, 2013, the Fund's expenses were not reduced under such arrangements. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 43 6. Line of Credit Facility The Fund, along with certain other funds in the Pioneer Family of Funds (the Funds), participates in a committed, unsecured revolving line of credit facility. Borrowings are used solely for temporary or emergency purposes. The Fund may borrow up to the lesser of the amount available under the facility or the limits set for borrowing by the Fund's prospectus and the 1940 Act. The credit facility in effect as of February 15, 2012 is in the amount of $215 million. Under such facility, depending on the type of loan, interest on borrowings is payable at the London Interbank Offered Rate (LIBOR) plus 0.90% on an annualized basis, or the Alternate Base Rate, which is the greater of (a) the facility's administrative agent's daily announced prime rate on the borrowing date, (b) 2% plus the Federal Funds Rate on the borrowing date and (c) 2% plus the overnight Euro dollar rate on the borrowing date. The Funds pay an annual commitment fee to participate in the credit facility. The commitment fee is allocated among participating Funds based on an allocation schedule set forth in the credit agreement. For the year ended March 31, 2013, the Fund had no borrowings under the credit facility. 44 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 Report of Independent Registered Public Accounting Firm To the Board of Trustees of Pioneer Series Trust X and the Shareowners of Pioneer Fundamental Growth Fund: -------------------------------------------------------------------------------- We have audited the accompanying statement of assets and liabilities, including the schedule of investments, of Pioneer Fundamental Growth Fund (one of the portfolios constituting Pioneer Series Trust X (the "Trust")) as of March 31, 2013, and the related statement of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, and the financial highlights for each of the periods indicated therein. These financial statements and financial highlights are the responsibility of the Trust's management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. We were not engaged to perform an audit of the Trust's internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Trust's internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements and financial highlights, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our procedures included confirmation of securities owned as of March 31, 2013, by correspondence with the custodian and brokers or by other appropriate auditing procedures where replies from brokers were not received. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the financial position of Pioneer Fundamental Growth Fund at March 31, 2013, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended, and the financial highlights for each of the periods indicated therein, in conformity with U.S. generally accepted accounting principles. /s/ Ernst & Young LLP Boston, Massachusetts May 28, 2013 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 45 ADDITIONAL INFORMATION (unaudited) For the year ended March 31, 2013, certain dividends paid by the Fund may be subject to a maximum tax rate of 15%, as provided for by the Jobs and Growth Tax Relief Reconciliation Act (the Act) of 2003. The Fund intends to designate up to the maximum amount of such dividends allowable under the Act, as taxed at a maximum rate of 15%. Complete information will be computed and reported in conjunction with your 2011 form 1099-DIV. The qualifying percentage of the Fund's ordinary income dividends for the purpose of the corporate dividends received deduction was 100%. 46 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 Approval of Investment Advisory Agreement Pioneer Investment Management, Inc. (PIM) serves as the investment adviser to Pioneer Fundamental Growth 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 2012 as the Trustees of the Fund agreed on, among other things, an overall approach and timeline for the process. In July 2012, 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 2012 and September 2012. 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, 2012 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 13, 2012, 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 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 47 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. 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, 2012, and in the second quintile of its Morningstar category for the three year period ended June 30, 2012. (In all quintile rankings referred to throughout this disclosure, first quintile is most favorable to the Fund's shareowners. Thus, highest relative performance would be first quintile and lowest relative expenses would also be first quintile.) The Trustees concluded that the investment performance of the Fund was satisfactory. Management Fee and Expenses The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees 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, 2012 was in the second quintile relative to the management fees paid by other funds in its Morningstar peer group for the 48 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 comparable period. The Trustees also considered the breakpoint in the management fee schedule and the reduced fee rate on assets over $1 billion. The Trustees considered that the Fund's expense ratio for the twelve months ended June 30, 2012 was in the second quintile relative to its Strategic Insight peer group for the comparable period. The Trustees reviewed management fees charged by PIM and PIM's affiliate, Pioneer Institutional Asset Management, Inc. (together with PIM, "Pioneer") to institutional and other clients, including publicly offered European funds sponsored by affiliates of Pioneer, unaffiliated 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 Pioneer's costs in providing services to the other clients and considered the differences in management fees and profit margins for Fund and non-Fund services. In evaluating the fees associated with Pioneer'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 Pioneer's management of 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. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 49 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 noted the breakpoint in the management fee schedule. 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 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 also considered the benefits to the Fund and to PIM and its affiliates from the use of "soft" commission dollars generated by the Fund to pay for research and brokerage services. The Trustees considered the intangible benefits to PIM by virtue of its relationship with the Fund and the other Pioneer funds. The Trustees concluded that the receipt of these benefits was reasonable in the context of the overall relationship between PIM and the Fund. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including all of the Independent Trustees, concluded that the investment advisory agreement between PIM and the Fund, including the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of the investment advisory agreement for the Fund. 50 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 Trustees, Officers and Service Providers Investment Adviser Pioneer Investment Management, Inc. Custodian and Sub-Administrator Brown Brothers Harriman & Co. Independent Registered Public Accounting Firm Ernst & Young LLP Principal Underwriter Pioneer Funds Distributor, Inc. Legal Counsel Bingham McCutchen LLP Shareowner Services and Transfer Agent Pioneer Investment Management Shareholder Services, Inc. Proxy Voting Policies and Procedures of the Fund are available without charge, upon request, by calling our toll free number (1-800-225-6292). Information regarding how the Fund voted proxies relating to portfolio securities during the most recent 12-month period ended June 30 is publicly available to shareowners at us.pioneerinvestments.com. This information is also available on the Securities and Exchange Commission's web site at www.sec.gov. Trustees and Officers The Fund's Trustees and Officers are listed on the following pages, together with their principal occupations during at least the past five years. Trustees who are interested persons of the Fund within the meaning of the 1940 Act are referred to as Interested Trustees. Trustees who are not interested persons of the Fund are referred to as Independent Trustees. Each of the Trustees serves as a trustee of each of the 56 U.S. registered investment portfolios for which Pioneer serves as investment adviser (the "Pioneer Funds"). The address for all Trustees and all officers of the Fund is 60 State Street, Boston, Massachusetts 02109. The Statement of Additional Information of the Fund includes additional information about the Trustees and is available, without charge, upon request, by calling 1-800-225-6292. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 51 Independent Trustees ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Term of Office and Other Directorships Position Held with the Fund Length of Service Principal Occupation Held by Trustee ------------------------------------------------------------------------------------------------------------------------------------ Thomas J. Perna (62) Trustee since 2006. Chairman and Chief Executive Officer, Director, Broadridge Chairman of the Board and Serves until a successor Quadriserv, Inc. (technology products Financial Solutions, Inc. Trustee trustee is elected or for securities lending industry) (2008 - (investor communications and earlier retirement or present); private investor (2004 - securities processing removal. 2008); and Senior Executive Vice provider for financial President, The Bank of New York services industry) (2009 - (financial and securities services) present); Director, (1986 - 2004) Quadriserv, Inc. (2005 - present); and Commissioner, New Jersey State Civil Service Commission (2011 - present) ------------------------------------------------------------------------------------------------------------------------------------ David R. Bock (69) Trustee since 2005. Managing Partner, Federal City Capital Director of Enterprise Trustee Serves until a successor Advisors (corporate advisory services Community Investment, Inc. trustee is elected or company) (1997 - 2004 and 2008 - (privately-held affordable earlier retirement or present); Interim Chief Executive housing finance company) removal. Officer, Oxford Analytica, Inc. (1985 - 2010); Director of (privately held research and consulting Oxford Analytica, Inc. (2008 company) (2010); Executive Vice - present); Director of The President and Chief Financial Officer, Swiss Helvetia Fund, Inc. I-trax, Inc. (publicly traded health (closed-end fund) (2010 - care services company) (2004 - 2007); present); and Director of and Executive Vice President and Chief New York Mortgage Trust Financial Officer, Pedestal Inc. (publicly traded mortgage (internet-based mortgage trading REIT) (2004 - 2009, 2012 - company) (2000 - 2002) present) ------------------------------------------------------------------------------------------------------------------------------------ Benjamin M. Friedman (68) Trustee since 2008. William Joseph Maier Professor of Trustee, Mellon Trustee Serves until a successor Political Economy, Harvard University Institutional Funds trustee is elected or (1972 - present) Investment Trust and Mellon earlier retirement or Institutional Funds Master removal. Portfolio (oversaw 17 portfolios in fund complex) (1989-2008) ------------------------------------------------------------------------------------------------------------------------------------ 52 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Term of Office and Other Directorships Position Held with the Fund Length of Service Principal Occupation Held by Trustee ------------------------------------------------------------------------------------------------------------------------------------ Margaret B.W. Graham (65) Trustee since 2002. Founding Director, Vice President and None Trustee Serves until a successor Corporate Secretary, The Winthrop Group, trustee is elected or Inc. (consulting firm) (1982-present); earlier retirement or Desautels Faculty of Management, McGill removal. University (1999 - present); and Manager of Research Operations and Organizational Learning, Xerox PARC, Xerox's advance research center (1990-1994) ------------------------------------------------------------------------------------------------------------------------------------ Marguerite A. Piret (64) Trustee since 2002. President and Chief Executive Officer, Director of New America High Trustee Serves until a successor Newbury, Piret & Company, Inc. Income Fund, Inc. trustee is elected or (investment banking firm) (1981 - (closed-end investment earlier retirement or present) company) (2004 - present); removal. and member, Board of Governors, Investment Company Institute (2000 - 2006) ------------------------------------------------------------------------------------------------------------------------------------ Stephen K. West (84) Trustee since 2002. Senior Counsel, Sullivan & Cromwell LLP Director, The Swiss Helvetia Trustee Serves until a successor (law firm) (1998 - present); and Fund, Inc. (closed-end trustee is elected or Partner, Sullivan & Cromwell LLP (prior investment company); and earlier retirement or to 1998) Director, Invesco, Ltd. removal. (formerly AMVESCAP PLC) (investment manager) (1997-2005) ------------------------------------------------------------------------------------------------------------------------------------ Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 53 Interested Trustees ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Term of Office and Other Directorships Position Held with the Fund Length of Service Principal Occupation Held by Trustee ------------------------------------------------------------------------------------------------------------------------------------ John F. Cogan, Jr. (86)* Trustee since 2002. Non-Executive Chairman and a director of None Trustee, President and Serves until a successor Pioneer Investment Management USA Inc. Chief Executive Officer of trustee is elected or ("PIM-USA"); Chairman and a director of the Fund earlier retirement or Pioneer; Chairman and Director of removal. Pioneer Institutional Asset Management, Inc. (since 2006); Director of Pioneer Alternative Investment Management Limited (Dublin) (until October 2011); President and a director of Pioneer Alternative Investment Management (Bermuda) Limited and affiliated funds; Deputy Chairman and a director of Pioneer Global Asset Management S.p.A. ("PGAM") (until April 2010); Director of Nano-C, Inc. (since 2003); Director of Cole Management Inc. (2004 - 2011); Director of Fiduciary Counseling, Inc. (until December 2011); President of all of the Pioneer Funds; and Retired Partner, Wilmer Cutler Pickering Hale and Dorr LLP ------------------------------------------------------------------------------------------------------------------------------------ Daniel K. Kingsbury (54)* Trustee since 2007. Director, CEO and President of PIM-USA None Trustee and Executive Vice Serves until a successor (since February 2007); Director and President trustee is elected or President of Pioneer and Pioneer earlier retirement or Institutional Asset Management, Inc. removal. (since February 2007); Executive Vice President of all of the Pioneer Funds (since March 2007); Director of PGAM (2007 - 2010); Head of New Europe Division, PGAM (2000 - 2005); Head of New Markets Division, PGAM (2005 - 2007) ------------------------------------------------------------------------------------------------------------------------------------ * Mr. Cogan and Mr. Kingsbury are Interested Trustees because they are officers or directors of the Fund's investment adviser and certain of its affiliates. 54 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 Fund Officers ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Term of Office and Other Directorships Position Held with the Fund Length of Service Principal Occupation Held by Officer ------------------------------------------------------------------------------------------------------------------------------------ Christopher J. Kelley (48) Since 2003. Serves at the Vice President and Associate General None Secretary discretion of the Board. Counsel of Pioneer since January 2008 and Secretary of all of the Pioneer Funds since June 2010; Assistant Secretary of all of the Pioneer Funds from September 2003 to May 2010; and Vice President and Senior Counsel of Pioneer from July 2002 to December 2007 ------------------------------------------------------------------------------------------------------------------------------------ Carol B. Hannigan (52) Since 2010. Serves at the Fund Governance Director of Pioneer None Assistant Secretary discretion of the Board. since December 2006 and Assistant Secretary of all the Pioneer Funds since June 2010; Manager - Fund Governance of Pioneer from December 2003 to November 2006; and Senior Paralegal of Pioneer from January 2000 to November 2003 ------------------------------------------------------------------------------------------------------------------------------------ Thomas Reyes (50) Since 2010. Serves at the Counsel of Pioneer since June 2007 and None Assistant Secretary discretion of the Board. Assistant Secretary of all the Pioneer Funds since June 2010; and Vice President and Counsel at State Street Bank from October 2004 to June 2007 ------------------------------------------------------------------------------------------------------------------------------------ Mark E. Bradley (53) Since 2008. Serves at the Vice President - Fund Treasury of None Treasurer and Chief discretion of the Board. Pioneer; Treasurer of all of the Pioneer Financial and Accounting Funds since March 2008; Deputy Treasurer Officer of the Fund of Pioneer from March 2004 to February 2008; and Assistant Treasurer of all of the Pioneer Funds from March 2004 to February 2008 ------------------------------------------------------------------------------------------------------------------------------------ Luis I. Presutti (47) Since 2002. Serves at the Assistant Vice President - Fund Treasury None Assistant Treasurer discretion of the Board. of Pioneer; and Assistant Treasurer of all of the Pioneer Funds ------------------------------------------------------------------------------------------------------------------------------------ Gary Sullivan (54) Since 2002. Serves at the Fund Accounting Manager - Fund Treasury None Assistant Treasurer discretion of the Board. of Pioneer; and Assistant Treasurer of all of the Pioneer Funds ------------------------------------------------------------------------------------------------------------------------------------ Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 55 Fund Officers (continued) ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Term of Office and Other Directorships Position Held with the Fund Length of Service Principal Occupation Held by Officer ------------------------------------------------------------------------------------------------------------------------------------ David F. Johnson (33) Since 2009. Serves at the Fund Administration Manager - Fund None Assistant Treasurer discretion of the Board. Treasury of Pioneer since November 2008; Assistant Treasurer of all of the Pioneer Funds since January 2009; and Client Service Manager - Institutional Investor Services at State Street Bank from March 2003 to March 2007 ------------------------------------------------------------------------------------------------------------------------------------ Jean M. Bradley (60) Since 2010. Serves at the Chief Compliance Officer of Pioneer and None Chief Compliance Officer discretion of the Board. of all the Pioneer Funds since March 2010; Director of Adviser and Portfolio Compliance at Pioneer since October 2005; and Senior Compliance Officer for Columbia Management Advisers, Inc. from October 2003 to October 2005 ------------------------------------------------------------------------------------------------------------------------------------ Kelley O'Donnell (42) Since 2006. Serves at the Director--Transfer Agency Compliance of None Anti-Money Laundering discretion of the Board. Pioneer and Anti-Money Laundering Officer Officer of all the Pioneer Funds since 2006 ------------------------------------------------------------------------------------------------------------------------------------ 56 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 This page for your notes. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 57 This page for your notes. 58 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 This page for your notes. Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 59 This page for your notes. 60 Pioneer Fundamental Growth Fund | Annual Report | 3/31/13 How to Contact Pioneer We are pleased to offer a variety of convenient ways for you to contact us for assistance or information. Call us for: -------------------------------------------------------------------------------- Account Information, including existing accounts, new accounts, prospectuses, applications and service forms 1-800-225-6292 FactFone(SM) for automated fund yields, prices, account information and transactions 1-800-225-4321 Retirement plans information 1-800-622-0176 Write to us: -------------------------------------------------------------------------------- PIMSS, Inc. P.O. Box 55014 Boston, Massachusetts 02205-5014 Our toll-free fax 1-800-225-4240 Our internet e-mail address ask.pioneer@pioneerinvestments.com (for general questions about Pioneer only) Visit our web site: us.pioneerinvestments.com This report must be preceded or accompanied by a prospectus. The Fund files a complete schedule of investments with the Securities and Exchange Commission for the first and third quarters for each fiscal year on Form N-Q. Shareholders may view the filed Form N-Q by visiting the Commission's web site at http://www.sec.gov. The filed form may also be viewed and copied at the Commission's Public Reference Room in Washington, DC. Information regarding the operations of the Public Reference Room may be obtained by calling 1-800-SEC-0330. [LOGO] PIONEER Investments(R) Pioneer Investment Management, Inc. 60 State Street Boston, MA 02109 us.pioneerinvestments.com Securities offered through Pioneer Funds Distributor, Inc. 60 State Street, Boston, MA 02109 Underwriter of Pioneer Mutual Funds, Member SIPC (C) 2013 Pioneer Investments 19341-07-0513 Pioneer Multi-Asset Ultrashort Income Fund (Formerly known as Pioneer Multi-Asset Floating Rate Fund)* -------------------------------------------------------------------------------- Annual Report | March 31, 2013 -------------------------------------------------------------------------------- Ticker Symbols: Class A MAFRX Class C MCFRX Class K MAUKX** Class Y MYFRX *Effective June 30, 2012, Pioneer Multi-Asset Floating Rate Fund was renamed Pioneer Multi-Asset Ultrashort Income Fund. **Share class was first publicly offered on December 20, 2012. [LOGO] PIONEER Investments(R) visit us: us.pioneerinvestments.com Table of Contents Letter to Shareowners 2 Portfolio Management Discussion 4 Portfolio Summary 10 Prices and Distributions 11 Performance Update 12 Comparing Ongoing Fund Expenses 16 Schedule of Investments 18 Financial Statements 87 Notes to Financial Statements 95 Report of Independent Registered Public Accounting Firm 104 Approval of Investment Advisory Agreement 105 Trustees, Officers and Service Providers 109 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 1 President's Letter Dear Shareowner, Pioneer continues to see only modest economic growth in the U.S. Employment continues to rise, albeit slowly, and we believe it will continue to do so in 2013, barring a negative shock to the system. The housing and auto sectors continue to recover, benefiting from record-low interest rates. Banks' willingness to lend to consumers and businesses also continues to rise, broad measures of inflation remain subdued, and, if the weather cooperates in 2013, food prices should come back down. And, while corporate profit growth has slowed, profits remain high and many U.S. companies continue to both pay and increase dividends*. Offsetting some of these positives are the continued contraction of fiscal policy in Washington and a recessionary Europe. The Federal Reserve's aggressive monetary policy has driven Treasury yields to generational lows and supported investments in all financial assets, including equities and high-yield corporate bonds. For example, the Standard & Poor's 500 Index (the S&P 500), a broad measure of the U.S. stock market, returned 15.99% for the full calendar year ended December 31, 2012, and the Bank of America Merrill Lynch High Yield Master II Index (the High Yield Index), which measures the performance of high-yield corporate bonds, returned 15.59% for the same 12-month period. On the other hand, the Barclays Aggregate Bond Index (the Aggregate Index), which tracks the performance of a higher-quality bond universe, gained 4.22% for the 12 months ended December 31, 2012; the safer-still Barclays Government Credit Index (the Government/Credit Index) returned 4.82%; and 3-month Treasury bills, generally regarded as essentially "risk free" by the markets, returned just 0.09% in 2012. "Risky" assets outperformed again in the first quarter of 2013, as the S&P 500 returned 10.60% and the High Yield Index returned 2.89%. In contrast, the Aggregate Index returned -0.12% in the first quarter, the Government Credit Index returned -0.16%, and Treasury bills returned 0.02%. Despite generally improving economic conditions and a rising stock market, global economies and investors still face daunting challenges as 2013 moves forward, although we remain cautiously optimistic. U.S. fiscal policy remains unsettled, and we feel the U.S. government could be at risk of credit rating downgrades from one or more of the major ratings agencies if the uncertainties persist. The Federal Reserve continues to provide extraordinary support to the U.S. economy and the bond market, but will not do so indefinitely. Europe has made progress, but has not yet resolved its sovereign-debt/banking problem, nor has the region been able to exit recession. Japan recently has unveiled aggressive and unconventional monetary and fiscal policies, but the country * Dividends are not guaranteed. 2 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 continues to face issues such as high levels of debt as well as an aging population. China and other emerging economies, while generally in better shape than most "developed" markets, also face a range of challenges. While most of the risks outlined here are widely recognized and may already be "priced in" to the market, we believe investors should continue to expect market volatility. At Pioneer, we have long advocated the benefits of staying diversified and investing for the long term. And while diversification does not assure a profit or protect against loss in a declining market, we believe there are still opportunities for prudent investors to earn attractive returns. 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, keeping in mind that there is no single best strategy that works for every investor. Pioneer's investment teams have, since 1928, sought out attractive opportunities in global equity and bond markets, using in-depth research to identify undervalued individual securities, and using thoughtful risk management to construct portfolios which balance potential risks and reward in an ever-changing world. We encourage you to learn more about Pioneer and our time-tested approach to investing by consulting with your financial advisor or visiting us online at us.pioneerinvestments.com. We greatly appreciate your trust in us, and we thank you for investing with Pioneer. Sincerely, /s/ Daniel K. Kingsbury Daniel K. Kingsbury President and CEO Pioneer Investment Management USA, Inc. Any information in this shareowner report regarding market or economic trends or the factors influencing the Fund's historical or future performance are statements of opinion as of the date of this report. These statements should not be relied upon for any other purposes. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 3 Portfolio Management Discussion | 3/31/13 In the following interview, portfolio managers Charles Melchreit, Seth Roman and Jonathan Sharkey discuss the market environment and the factors that influ- enced the performance of Pioneer Multi-Asset Ultrashort Income Fund during the 12-month period ended March 31, 2013. Mr. Melchreit, a vice president and portfolio manager at Pioneer, Mr. Roman, a vice president and portfolio manager at Pioneer, and Mr. Sharkey, a vice president and portfolio manager at Pioneer, are responsible for the day-to-day management of the Fund. Q How would describe the market environment for fixed-income investors during the 12 months ended March 31, 2013? A For most of the period, credit-sensitive sectors continued to benefit from the Federal Reserve Board's (the Fed's) policies, which in effect have forced investors seeking any kind of reasonable return to assume a degree of risk. Early in the period, during the spring and early summer of 2012, the flight-to-credit trend was somewhat mitigated by headlines coming out of Europe that called into question the future of the euro currency. Negotiations over a rescue of Greece vacillated between stalemate and grudging progress, while borrowing costs for the governments of larger economies such as Spain and Italy rose alarmingly. Elsewhere, economic growth in China continued to slow, while in the United States most economic indicators deteriorated and consensus growth estimates were lowered. As the period progressed, however, markets began to focus more on positive developments in the United States. U.S. housing data increasingly confirmed that prices had bottomed out and were even beginning to rise. In addition, with employment data continuing to disappoint, markets anticipated that the Fed would announce further bond purchases under a third round of quantitative easing ("QE3"). In September, the Fed met this expectation by announcing QE3, which involved purchases of agency mortgage-backed securities in the open market. At the same time, the Fed extended its commitment to keeping short-term rates at extraordinarily low levels, likely through 2015. The prospect of a new round of Fed support for the economy, along with a prolonged environment of low returns on risk-free assets, further strengthened investors' interest in credit-sensitive sectors. As November 2012 approached, the impending U.S. Presidential election and its potential implications for resolving the stalemate over the country's budgetary dilemma began to unsettle the markets. After the election, however, with the makeup of the government basically reverting to the 4 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 pre-election status quo, the so-called "fiscal cliff " scenario was, ultimately, averted, and risk sentiment in the markets resumed a positive tone in January of 2013. The positive sentiment was supported by continued improvements in U.S. auto and housing data as well as indications that economic growth in China would remain at levels sufficient to meaningfully bolster the overall global outlook. Interest rates began the 12-month period at extraordinarily low levels, and finished even lower. For the full 12-month period ended March 31, 2013, rates fell along the length of the Treasury yield curve. Specifically, the two-year Treasury yield went from 0.33% to 0.25% between April 1, 2012, and March 31, 2013; the five-year yield went from 1.04% to 0.77%; the 10-year yield went from 2.23% to 1.87%; and the 30-year yield went from 3.35% to 3.10%. Most credit spreads narrowed over the period as well, as investors continued to seek alternatives to the very low yields available among Treasury investments (credit spreads are commonly defined as the differences in yield between Treasuries and other types of fixed-income securities with similar maturities). While the three-month London Interbank Offered Rate (LIBOR) fluctuated along with developments in the European debt crisis, it still remained at very low levels throughout the period. Q How did the Fund perform in that environment during the 12 months ended March 31, 2013? A Pioneer Multi-Asset Ultrashort Income Fund's Class A shares returned 2.14% at net asset value during the 12 months ended March 31, 2013, while the Fund's benchmark, the Bank of America Merrill Lynch U.S. Dollar 3-Month LIBOR Index (the BofA ML Index), returned 0.43%. During the same 12-month period, the average return of the 92 mutual funds in Lipper's Ultra-Short Obligations Funds category was 1.18%. Q Can you review the Fund's principal investment strategies during the 12 months ended March 31, 2013? A We continued to maintain a portfolio designed to provide investors with a solid level of income, while providing significant protection of principal in the event of any rise in market interest rates. The strategy entailed investing the Fund in a wide range of mostly high-quality floating-rate securities as well as fixed-rate instruments with very short remaining maturities. As of March 31, 2013, well over 80% of the Fund's assets were held in floating-rate issues with interest rates tied to LIBOR, or fixed-rate issues with less than one year remaining to maturity. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 5 Unlike many other floating-rate vehicles, the Fund's holdings are focused primarily on investment-grade asset classes. At the same time, we do seek to derive some Fund performance from credit spreads - the incremental yield available from issues that trade at a yield premium to Treasuries. In doing so, we seek at all times to maintain diversified* portfolio exposure to a range of spread sectors. The principal spread sectors currently represented in the Fund include asset-backed securities (ABS), mortgage-backed securities (MBS), both agency and non-agency, and investment-grade corporate bonds. In making purchases, we seek to have the Fund benefit from attractive income opportunities, while minimizing exposure to price volatility by emphasizing shorter remaining maturities. As always, we are mindful that many investors view the Fund as a source of liquidity in their portfolios. As such, we continue to maintain significant liquidity in the portfolio, which allows the Fund to meet shareholder redemption requests without forced selling. With Treasury yields at such unattractive levels, we find that some money market instruments such as repurchase agreements provide the Fund with the requisite liquidity and income. Q Could you discuss how your investment strategies affected the Fund's performance during the 12 months ended March 31, 2013? A The Fund's credit exposures worked out well over the 12-month period. About half of the Fund's assets were held in securitized sectors, principally high-quality MBS and ABS, and that exposure added the most to the Fund's benchmark-relative performance during the period. The strong income component of the ABS/MBS holdings was combined with price strengthening as credit spreads narrowed. Among the Fund's commercial MBS holdings, we trimmed exposure to fixed-rate assets in favor of floating-rate pools, in order to help protect the portfolio against a rise in prepayment rates. Within the ABS portion of the portfolio, we increased the Fund's exposure to home equity loans, where we have seen reasonable valuations; the home equity holdings benefited during the period from the firming in housing prices. Performance relative to the BofA ML Index benchmark also was helped by the Fund's allocation to investment-grade corporates. While our focus has been on the investment-grade sectors, we also include representation from below-investment-grade asset categories in the portfolio, as we believe the incremental income available in that sector provides an attractive tradeoff * Diversification does not assure a profit nor protect against loss in a declining market. 6 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 between risk and reward. In that vein, the Fund has an allocation to leveraged bank loans, whose prices benefited during the period, not only from the positive overall market sentiment with respect to credit sectors, but also from investors who were attracted to the protection the leveraged loans' floating-rate features can provide against future interest-rate increases. Q What is your assessment of the current investment climate for the Fund? A U.S. Treasury securities, in relation to the spread sectors, continue to be an unattractive investment for the Fund, given real yields - or yields after taking inflation into account - that are significantly negative. Despite slowing economic growth in China and some recent softness in key U.S. indicators such as retail sales and employment, we continue to expect economic growth that should be sufficient to support fundamentals in the credit sectors. Given this backdrop, we expect to maintain a portfolio tilt in favor of spread sectors. That said, we have seen significant price appreciation and spread narrowing across the credit sectors, and the process of identifying high-quality securities that are trading at attractive valuations is especially labor intensive given recent price strength. We have a strong focus on individual security selection, while being careful not to assume risk for which the Fund is not adequately compensated. While the threat of calamity appears to have greatly reduced, we continue to expect that the ever-lingering European sovereign-debt and banking problems will take some time to resolve. With the bulk of the portfolio invested in floating-rate securities with yields tied to LIBOR, we believe it likely that the Fund's income stream will continue to be influenced by developments in Europe. In all environments, we will continue to seek to provide the Fund's shareholders with solid levels of income as well as significant protection against any future rise in market interest rates. Please refer to the Schedule of Investments on pages 18-86 for a full listing of Fund securities. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 7 All investments are subject to risk, including the possible loss of principal. Pioneer Multi-Asset Ultrashort Income ("MAUI") Fund has the ability to invest in a wide variety of debt securities. The Fund may invest in underlying funds (ETFs and unit investment trusts). In addition to the Fund's operating expenses, you will indirectly bear the operating expenses of investments in any underlying funds. The Fund and some of the underlying funds employ leverage, which increases the volatility of investment returns and subjects the Fund to magnified losses if an underlying fund's investments decline in value. The Fund and some of the underlying funds may use derivatives, such as options and futures, which can be illiquid, may disproportionately increase losses, and have a potentially large impact on Fund performance. The Fund may invest in inflation-linked securities. As inflationary expectations increase, inflation-linked securities may become more attractive, because they protect future interest payments against inflation. Conversely, as inflationary concerns decrease, inflation-linked securities will become less attractive and less valuable. The Fund may invest in credit default swaps, which may in some cases be illiquid, and they increase credit risk since the Fund has exposure to both the issuer of the referenced obligation and the counterparty to the credit default swap. The Fund may invest in subordinated securities which may be disproportionately adversely affected by a default or even a perceived decline in creditworthiness of the issuer. The Fund may invest in floating-rate loans. The value of collateral, if any, securing a floating-rate loan can decline or may be insufficient to meet the issuer's obligations or may be difficult to liquidate. The Fund may invest in event-linked bonds. The return of principal and the payment of interest on event-linked bonds are contingent on the non-occurrence of a pre-defined "trigger" event, such as a hurricane or an earthquake of a specific magnitude. The Fund may invest in zero-coupon bonds and payment-in-kind securities, which may be more speculative and fluctuate more in value than other fixed income securities. The accrual of income from these securities are payable as taxable annual dividends to shareholders. Investments in equity securities are subject to price fluctuation. 8 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 International investments are subject to special risks including currency fluctuations, social, economic and political uncertainties, which could increase volatility. These risks are magnified in emerging markets. Investments in fixed-income securities involve interest rate, credit, inflation, and reinvestment risks. As interest rates rise, the value of fixed income securities falls. The Fund may invest in mortgage-backed securities, which during times of fluctuating interest rates may increase or decrease more than other fixed-income securities. Mortgage-backed securities are also subject to pre-payments. Prepayment risk is the chance that mortgage-backed bonds will be paid off early if falling interest rates prompt homeowners to refinance their mortgages. High yield bonds possess greater price volatility, illiquidity, and possibility of default. There may be insufficient or illiquid collateral securing the floating rate loans held within the Fund. This may reduce the future redemption or recovery value of such loans. The Fund may have disadvantaged access to confidential information that could be used to assess a loan issuer, as Pioneer normally seeks to avoid receiving material, non-public information. There is no assurance that these and other strategies used by the Fund or underlying funds will be successful. Pioneer Multi-Asset Ultrashort Income Fund is not a money market fund. These risks may increase share price volatility. Please see the prospectus for a more complete discussion of the Fund's risks. 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 statements should not be relied upon for any other purposes. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 9 Portfolio Summary | 3/31/13 Portfolio Diversification -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Collateralized Mortgage Obligations 31.3% Asset Backed Securities 24.5% U.S. Corporate Bonds 12.5% U.S. Government Securities 7.6% Senior Secured Loans 7.0% International Corporate Bonds 6.8% Temporary Cash Investments 6.6% Municipal Bonds 3.7% Portfolio Quality -------------------------------------------------------------------------------- (As a percentage of total investment portfolio; based on S&P ratings) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] AAA 40.7% AA 14.5% A 15.9% B 3.3% BB 9.5% BBB 9.2% CCC 0.2% Cash and equivalents 4.6% Not Rated 2.1% 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. Federal National Mortgage Association, Floating Rate Note, 3/4/14 1.33% ----------------------------------------------------------------------------------------------------- 2. Maryland Health & Higher Educational Facilities Authority, Floating Rate Note, 7/1/36 0.89 ----------------------------------------------------------------------------------------------------- 3. Loudoun County Industrial Development Authority, Floating Rate Note, 2/15/38 0.57 ----------------------------------------------------------------------------------------------------- 4. Federal Home Loan Banks, Floating Rate Note, 8/22/13 0.57 ----------------------------------------------------------------------------------------------------- 5. University of Michigan, Floating Rate Note, 12/1/29 0.53 ----------------------------------------------------------------------------------------------------- 6. Connecticut State Health & Educational Facility Authority, Floating Rate Note, 7/1/33 0.51 ----------------------------------------------------------------------------------------------------- 7. Federal Home Loan Mortgage Corp., Floating Rate Note, 11/18/13 0.51 ----------------------------------------------------------------------------------------------------- 8. Federal National Mortgage Association, Floating Rate Note, 8/9/13 0.50 ----------------------------------------------------------------------------------------------------- 9. Federal Home Loan Banks, Floating Rate Note, 2/28/14 0.50 ----------------------------------------------------------------------------------------------------- 10. BA Credit Card Trust, Floating Rate Note, 12/15/16 0.50 ----------------------------------------------------------------------------------------------------- * This list excludes temporary cash investments and derivative instruments. The portfolio is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any security listed. 10 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 Prices and Distributions | 3/31/13 Net Asset Value per Share -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 3/31/13 3/31/12 -------------------------------------------------------------------------------- A $10.08 $10.02 -------------------------------------------------------------------------------- C $10.07 $10.02 -------------------------------------------------------------------------------- Y $10.09 $10.03 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 3/31/13 12/20/12 -------------------------------------------------------------------------------- K $10.08 $10.09 -------------------------------------------------------------------------------- Distributions per Share: 4/1/12-3/31/13 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains -------------------------------------------------------------------------------- A $0.1528 $ -- $ -- -------------------------------------------------------------------------------- C $0.1102 $ -- $ -- -------------------------------------------------------------------------------- K $0.0532 $ -- $ -- -------------------------------------------------------------------------------- Y $0.1736 $ -- $ -- -------------------------------------------------------------------------------- The Bank of America Merrill Lynch U.S. Dollar 3-Month LIBOR Index is an unmanaged index that tracks the performance of a synthetic asset paying the London Interbank Offered Rate (LIBOR), with a constant 3-month average maturity. The index is based on the assumed purchase at par value of a synthetic instrument having exactly its stated maturity and with a coupon equal to that day's 3-month LIBOR rate. Index returns 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 12-15. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 11 Performance Update | 3/31/13 Class A Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Multi-Asset Ultrashort Income Fund at public offering price, compared to that of the Bank of America (BofA) Merrill Lynch U.S. Dollar 3-Month LIBOR Index. Average Annual Total Returns (As of March 31, 2013) -------------------------------------------------------------------------------- Net Asset Public Offering Period Value (NAV) Price (POP) -------------------------------------------------------------------------------- Life-of-Class (5/2/11) 1.88% 0.53% 1 Year 2.14 -0.45 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated April 1, 2013) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 1.03% 0.85% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Multi-Asset BofA Merrill Lynch U.S. Ultrashort Income Fund Dollar 3-Month LIBOR Index 4/30/2011 $ 9,750 $ 10,000 3/31/2012 $ 9,891 $ 10,032 3/31/2013 $ 10,103 $ 10,075 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 2.50% 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 contractual expense limitations currently in effect through August 1, 2014, for Class A shares. There can be no assurance that Pioneer will extend the expense limitations beyond such time. Please see the prospectus for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. 12 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 Performance Update | 3/31/13 Class C Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Multi-Asset Ultrashort Income Fund, compared to that of the Bank of America (BofA) Merrill Lynch U.S. Dollar 3-Month LIBOR Index. Average Annual Total Returns (As of March 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class (5/2/11) 1.26% 1.26% 1 Year 1.61 1.61 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated April 1, 2013) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 1.37% 1.15% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Multi-Asset BofA Merrill Lynch U.S. Ultrashort Income Fund Dollar 3-Month LIBOR Index 4/30/2011 $ 10,000 $ 10,000 3/31/2012 $ 10,082 $ 10,032 3/31/2013 $ 10,243 $ 10,075 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 purchased prior to July 1, 2012, and held for less than one year are subject to a 1% contingent deferred sales charge (CDSC). "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through August 1, 2014, for Class C shares. There can be no assurance that Pioneer will extend the expense limitations beyond such time. Please see the prospectus 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 Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 13 Performance Update | 3/31/13 Class K Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Multi-Asset Ultrashort Income Fund, compared to that of the Bank of America (BofA) Merrill Lynch U.S. Dollar 3-Month LIBOR Index. Average Annual Total Returns (As of March 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class (5/2/11) 1.92% 1.92% 1 Year 2.20 2.20 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated April 1, 2013) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 0.43% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Multi-Asset BofA Merrill Lynch U.S. Ultrashort Income Fund Dollar 3-Month LIBOR Index 3/31/2012 $ 10,000 $ 10,000 3/31/2013 $ 10,148 $ 10,032 3/31/2013 $ 10,372 $ 10,075 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 K shares for the period prior to the commencement of operations of Class K shares on December 20, 2012, is the net asset value performance of the Fund's Class A shares, which has not been restated to reflect any differences in expenses, including Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares generally are higher than those of Class K shares, the performance of Class K shares prior to their inception would have been higher than the performance shown. Class K 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. 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 Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 Performance Update | 3/31/13 Class Y Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 million investment made in Pioneer Multi-Asset Ultrashort Income Fund, compared to that of the Bank of America (BofA) Merrill Lynch U.S. Dollar 3-Month LIBOR Index. Average Annual Total Returns (As of March 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class (5/2/11) 2.15% 2.15% 1 Year 2.35 2.35 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated April 1, 2013) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 0.80% 0.65% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $5 Million Investment Pioneer Multi-Asset BofA Merrill Lynch U.S. Ultrashort Income Fund Dollar 3-Month LIBOR Index 4/30/201 $ 5,000,000 $ 5,000,000 3/31/201 $ 5,089,498 $ 5,016,143 3/31/201 $ 5,208,889 $ 5,037,507 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 Y shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through August 1, 2014, for Class Y shares. There can be no assurance that Pioneer will extend the expense limitations beyond such time. Please see the prospectus 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 Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 15 Comparing Ongoing Fund Expenses As a shareowner in the Fund, you incur two types of costs: (1) ongoing costs, including management fees, distribution and/or service (12b-1) fees, and other Fund expenses; and (2) transaction costs, including sales charges (loads) on purchase payments. This example is intended to help you understand your ongoing expenses (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. The example is based on an investment of $1,000 at the beginning of the Fund's latest six-month period and held throughout the six months. Using the Tables -------------------------------------------------------------------------------- Actual Expenses The first table below provides information about actual account values and actual expenses. You may use the information in this table, together with the amount you invested, to estimate the expenses that you paid over the period as follows: (1) Divide your account value by $1,000 Example: an $8,600 account value (divided by) $1,000 = 8.6 (2) Multiply the result in (1) above by the corresponding share class's number in the third row under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. Expenses Paid on a $1,000 Investment in Pioneer Multi-Asset Ultrashort Income Fund Based on actual returns from October 1, 2012, through March 31, 2013. -------------------------------------------------------------------------------- Share Class A C K Y -------------------------------------------------------------------------------- Beginning Account Value on 10/1/12** $1,000.00 $1,000.00 $1,000.00 $1,000.00 -------------------------------------------------------------------------------- Ending Account Value (after expenses) on 3/31/13 $1,006.60 $1,005.14 $1,004.30 $1,007.58 -------------------------------------------------------------------------------- Expenses Paid During Period* $3.60 $5.15 $1.48 $2.75 -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized net expense ratio of 0.72%, 1.03%, 0.53% and 0.55% for Class A, Class C, Class K and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 182/365 (102/365 for Class K shares)(to reflect the one-half year period). ** 12/20/12 for Class K shares. 16 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 Hypothetical Example for Comparison Purposes The table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the tables are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as sales charges (loads) that are charged at the time of the transaction. Therefore, the table below is useful in comparing ongoing costs only and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher. Expenses Paid on a $1,000 Investment in Pioneer Multi-Asset Ultrashort Income Fund Based on a hypothetical 5% return per year before expenses, reflecting the period from October 1, 2012, through March 31, 2013. -------------------------------------------------------------------------------- Share Class A C K Y -------------------------------------------------------------------------------- Beginning Account Value on 10/1/12** $1,000.00 $1,000.00 $1,000.00 $1,000.00 -------------------------------------------------------------------------------- Ending Account Value (after expenses) on 3/31/13 $1,021.34 $1,019.80 $1,012.49 $1,022.19 -------------------------------------------------------------------------------- Expenses Paid During Period* $ 3.63 $ 5.19 $ 1.49 $ 2.77 -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized net expense ratio of 0.72%, 1.03%, 0.53% and 0.55% for Class A, Class C, Class K and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 182/365 (102/365 for Class K shares)(to reflect the one-half year period). ** 12/20/12 for Class K shares. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 17 Schedule of Investments | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- ASSET BACKED SECURITIES -- 24.5% MATERIALS -- 6.9% Diversified Chemicals -- 0.2% 3,000,000 0.60 AAA/NR BMW Floorplan Master Owner Trust, Floating Rate Note, 9/15/17 (144A) $ 3,008,684 ---------------------------------------------------------------------------------------------------------- Precious Metals & Minerals -- 0.1% 390,622 6.50 BB+/Baa2 ACE Securities Corp Manufactured Housing Trust Series 2003-MH1, Floating Rate Note, 8/15/30 (144A) $ 393,972 880,728 BB+/Baa1 Credit-Based Asset Servicing and Securitization LLC, 5.082%, 4/25/37 (Step) 898,476 187,423 1.10 BBB+/B2 Salomon Mortgage Loan Trust Series 2001-CB4, Floating Rate Note, 11/25/33 174,427 -------------- $ 1,466,875 ---------------------------------------------------------------------------------------------------------- Steel -- 4.6% 202,562 2.98 BB+/Caa3 ABFC 2003-WMC1 Trust, Floating Rate Note, 3/25/33 $ 180,356 326,832 0.92 BBB+/Baa3 ABFC 2005-HE2 Trust, Floating Rate Note, 6/25/35 326,528 887,890 0.51 AAA/Aa3 ABFC 2005-WF1 Trust, Floating Rate Note, 12/25/34 866,009 1,110,000 0.60 CCC/Baa3 Accredited Mortgage Loan Trust 2005-2, Floating Rate Note, 7/25/35 1,068,514 1,604,498 2.00 BBB+/Ba3 ACE Securities Corp Home Equity Loan Trust Series 2002-HE3, Floating Rate Note, 10/25/32 1,573,444 462,139 0.67 AA+/A3 ACE Securities Corp Home Equity Loan Trust Series 2005-HE5, Floating Rate Note, 8/25/35 461,565 80,316 0.74 BB+/Aa2 Aegis Asset Backed Securities Trust 2004-6, Floating Rate Note, 3/25/35 80,152 1,869,032 1.16 AAA/Aaa Aegis Asset Backed Securities Trust Mortgage Pass-Through Certificates Series 2004-2, Floating Rate Note, 6/25/34 1,848,899 1,300,704 0.75 AAA/Aa1 Aegis Asset Backed Securities Trust Mortgage Pass-Through Certificates Series 2004-4, Floating Rate Note, 10/25/34 1,275,045 1,242,864 0.40 BB/Ba3 Asset Backed Securities Corp. Home Equity Loan Trust Series AEG 2006-HE1, Floating Rate Note, 1/25/36 1,159,547 1,489,793 0.61 AAA/Aa1 Bayview Financial Mortgage Pass-Through Trust 2005-C, Floating Rate Note, 6/28/44 1,458,260 The accompanying notes are an integral part of these financial statements. 18 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Steel -- (continued) 467,351 0.50 AAA/Aaa Bayview Financial Mortgage Pass-Through Trust 2006-A, Floating Rate Note, 2/28/41 $ 461,536 2,345,043 0.50 AA+/A1 Bayview Financial Mortgage Pass-Through Trust 2006-B, Floating Rate Note, 4/28/36 2,254,641 1,163,265 0.47 AA+/A1 Bayview Financial Mortgage Pass-Through Trust 2006-B, Floating Rate Note, 4/28/36 1,110,313 1,839,351 0.65 AA/Aa2 Bayview Financial Mortgage Pass-Through Trust Series 2005-B, Floating Rate Note, 4/28/39 1,804,199 1,851,978 0.70 A+/Ba3 Bear Stearns Asset Backed Securities I Trust 2005-FR1, Floating Rate Note, 6/25/35 1,808,686 1,105,389 0.70 AA+/NR Bear Stearns Asset Backed Securities I Trust 2005-HE8, Floating Rate Note, 8/25/35 1,100,314 300,000 0.61 BBB+/B2 Bear Stearns Asset Backed Securities I Trust 2006-EC1, Floating Rate Note, 12/25/35 285,994 7,688 0.70 AAA/NR Bear Stearns Asset Backed Securities Trust 2004-2, Floating Rate Note, 8/25/34 7,425 1,288,630 0.33 CCC/Ba1 Bear Stearns Asset Backed Securities Trust 2006-4, Floating Rate Note, 10/25/36 1,266,220 448,945 1.20 BBB/A1 Bear Stearns Structured Products Trust 2007-EMX1, Floating Rate Note, 3/25/37 (144A) 440,939 361,265 1.55 A+/Ba1 CDC Mortgage Capital Trust 2003-HE1, Floating Rate Note, 8/25/33 340,879 76,520 0.47 AA+/A1 Citigroup Mortgage Loan Trust 2006-HE1, Floating Rate Note, 1/25/36 75,287 1,709 D/NR Delta Funding Home Equity Loan Trust 1997-2, 7.04%, 6/25/27 1,795 33,681 A-/WR EquiVantage Home Equity Loan Trust 1997-1, 8.05%, 3/25/28 (Step) 33,250 262,358 0.60 AA+/Aa2 First NLC Trust 2005-2, Floating Rate Note, 9/25/35 255,433 2,248,113 0.98 AA+/Ba1 GSAA Home Equity Trust 2004-6, Floating Rate Note, 6/25/34 2,151,077 278,324 0.94 AAA/Aa2 GSAA Home Equity Trust 2004-8, Floating Rate Note, 9/25/34 273,109 1,027,685 0.45 B+/B3 GSAA Home Equity Trust 2005-11, Floating Rate Note, 10/25/35 1,006,779 3,404,000 0.67 A+/A3 Home Equity Asset Trust 2005-6, Floating Rate Note, 12/25/35 3,336,237 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 19 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Steel -- (continued) 2,868,166 0.58 A+/Baa2 Home Equity Asset Trust 2005-7, Floating Rate Note, 1/25/36 $ 2,764,708 361,371 0.38 BBB+/A1 Home Equity Asset Trust 2006-3, Floating Rate Note, 7/25/36 359,208 263,083 0.31 CCC/Ba1 Home Equity Asset Trust 2006-8, Floating Rate Note, 3/25/37 254,964 57,618 0.31 BBB/A1 Home Equity Asset Trust 2007-2, Floating Rate Note, 7/25/37 57,192 349,731 0.47 A/Ba1 Home Equity Mortgage Loan Asset-Backed Trust Series INABS 2005-C, Floating Rate Note, 10/25/35 340,545 331,016 0.46 AAA/Aaa HSBC Home Equity Loan Trust 2005-3, Floating Rate Note, 1/20/35 327,837 515,055 0.39 AA+/Aa1 HSBC Home Equity Loan Trust USA 2007-2, Floating Rate Note, 7/20/36 503,931 100,000 1.35 AA+/Aaa HSBC Home Equity Loan Trust USA 2007-3, Floating Rate Note, 11/20/36 98,541 2,237,431 1.40 A+/Aa2 HSBC Home Equity Loan Trust USA 2007-3, Floating Rate Note, 11/20/36 2,240,089 1,421,842 0.77 AA/A1 Irwin Whole Loan Home Equity Trust 2005-C, Floating Rate Note, 4/25/30 1,417,528 31,722 0.94 AAA/A3 IXIS Real Estate Capital Trust 2005-HE1, Floating Rate Note, 6/25/35 31,682 76,412 0.54 BB/A2 IXIS Real Estate Capital Trust 2005-HE4, Floating Rate Note, 2/25/36 74,160 1,797,396 0.42 BB+/Ba1 JP Morgan Mortgage Acquisition Corp 2005-FRE1, Floating Rate Note, 10/25/35 1,738,440 614,872 0.85 AA+/A3 Mastr Asset Backed Securities Trust 2004-HE1, Floating Rate Note, 9/25/34 611,034 194,733 0.45 AAA/Aa2 Mastr Asset Backed Securities Trust 2005-FRE1, Floating Rate Note, 10/25/35 193,816 3,368,586 0.43 BB+/A2 Mastr Asset Backed Securities Trust 2006-AB1, Floating Rate Note, 2/25/36 3,327,193 4,454,951 0.39 B-/B1 Mastr Asset Backed Securities Trust 2006-NC1, Floating Rate Note, 1/25/36 4,353,895 1,017,477 0.94 A/Aa1 Merrill Lynch Mortgage Synthetic, Floating Rate Note, 6/28/35 (144A) 1,014,781 125,624 0.91 AA-/Ba2 Morgan Stanley ABS Capital I Inc Trust 2005-WMC3, Floating Rate Note, 3/25/35 124,851 115,934 0.52 A+/Ba1 Morgan Stanley Home Equity Loan Trust 2005-4, Floating Rate Note, 9/25/35 111,387 315,682 0.72 A-/Baa3 MSDWCC Heloc Trust 2003-2, Floating Rate Note, 4/25/16 313,944 7,862 0.30 AA+/A2 Nationstar Home Equity Loan Trust 2007-A, Floating Rate Note, 3/25/37 7,858 The accompanying notes are an integral part of these financial statements. 20 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Steel -- (continued) 250,000 0.35 B-/Caa2 Nationstar Home Equity Loan Trust 2007-A, Floating Rate Note, 3/25/37 $ 233,906 1,778,592 1.33 BBB+/Baa3 New Century Home Equity Loan Trust Series 2003-4, Floating Rate Note, 10/25/33 1,739,434 780,684 0.46 NR/Aaa New Century Home Equity Loan Trust Series 2005-2, Floating Rate Note, 6/25/35 777,817 30,217 0.50 AAA/Aa1 New Century Home Equity Loan Trust Series 2005-2, Floating Rate Note, 6/25/35 29,964 262,213 0.60 AA+/NR Option One Mortgage Loan Trust 2005-1, Floating Rate Note, 2/25/35 258,197 155,823 0.46 AA+/Aa3 Option One Mortgage Loan Trust 2005-4 Asset-Backed Certificates Series 2005-4, Floating Rate Note, 11/25/35 153,121 88,965 AA-/A2 Option One Mortgage Loan Trust 2007-FXD2, 5.9%, 3/25/37 (Step) 87,566 351,138 0.63 AA/A2 RASC Series 2005-KS3 Trust, Floating Rate Note, 4/25/35 343,940 881,580 0.59 AA+/A3 Specialty Underwriting & Residential Finance Trust Series 2005-AB2, Floating Rate Note, 6/25/36 860,543 882,802 0.40 BBB+/Ba1 Specialty Underwriting & Residential Finance Trust Series 2006-BC1, Floating Rate Note, 12/25/36 867,199 2,815,436 0.50 BBB+/B2 Specialty Underwriting & Residential Finance Trust Series 2006-BC1, Floating Rate Note, 12/25/36 2,702,951 3,258,611 0.50 AAA/Caa2 Structured Asset Securities Corp Mortgage Loan Trust 2005-S7, Floating Rate Note, 12/25/35 (144A) 3,079,717 686,038 0.60 AAA/Aaa Truman Capital Mortgage Loan Trust, Floating Rate Note, 12/25/32 (144A) 685,826 189,000 0.61 AAA/A3 Wells Fargo Home Equity Asset-Backed Securities 2005-2 Trust, Floating Rate Note, 11/25/35 186,200 -------------- $ 60,586,397 ---------------------------------------------------------------------------------------------------------- Paper Products -- 2.0% 750,000 0.45 AAA/Aaa Bank One Issuance Trust, Floating Rate Note, 5/16/16 $ 750,644 1,500,000 0.44 AAA/Aaa Chase Credit Card Owner Trust 2003-4, Floating Rate Note, 1/15/16 1,501,773 2,700,000 0.35 AAA/NR Chase Issuance Trust, Floating Rate Note, 10/16/17 2,702,084 4,355,000 0.30 AAA/NR Chase Issuance Trust, Floating Rate Note, 5/16/16 4,356,119 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 21 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Paper Products -- (continued) 2,650,000 1.50 AAA/Aaa Chase Issuance Trust, Floating Rate Note, 8/15/15 $ 2,663,390 3,630,000 0.33 AAA/NR Chase Issuance Trust, Floating Rate Note, 8/15/17 3,631,104 1,000,000 0.35 AAA/Aaa Dryrock Issuance Trust, Floating Rate Note, 8/15/17 1,000,310 1,000,000 0.75 AAA/Aaa Gracechurch Card Funding Plc, Floating Rate Note, 4/15/15 (144A) 1,000,173 1,300,000 1.05 AAA/Aaa Gracechurch Card Funding Plc, Floating Rate Note, 5/15/19 (144A) 1,316,952 1,000,000 0.90 AAA/Aaa Gracechurch Card Funding Plc, Floating Rate Note, 6/15/17 (144A) 1,009,953 800,000 0.95 AAA/Aaa Penarth Master Issuer Plc, Floating Rate Note, 11/18/15 (144A) 800,840 2,465,000 0.77 AAA/Aaa Penarth Master Issuer Plc, Floating Rate Note, 3/18/14 (144A) 2,465,222 3,400,000 0.85 AAA/Aaa Penarth Master Issuer Plc, Floating Rate Note, 5/18/15 (144A) 3,399,592 -------------- $ 26,598,156 -------------- Total Materials $ 91,660,112 ---------------------------------------------------------------------------------------------------------- CAPITAL GOODS -- 0.0%+ Industrial Machinery -- 0.0%+ 91,322 AAA/Aaa CIT Equipment Collateral 2012-VT1, 0.85%, 5/20/14 (144A) $ 91,380 -------------- Total Capital Goods $ 91,380 ---------------------------------------------------------------------------------------------------------- COMMERCIAL SERVICES & SUPPLIES -- 0.0%+ Research & Consulting Services -- 0.0%+ 385,417 0.39 BBB/Baa2 TAL Advantage I LLC, Floating Rate Note, 4/20/21 (144A) $ 378,842 -------------- Total Commercial Services & Supplies $ 378,842 ---------------------------------------------------------------------------------------------------------- AUTOMOBILES & COMPONENTS -- 0.8% Automobile Manufacturers -- 0.8% 8,457 AAA/Aaa AmeriCredit Automobile Receivables Trust 2009-1, 9.79%, 4/15/14 $ 8,525 2,000,000 AAA/NR AmeriCredit Automobile Receivables Trust 2013-1, 0.49%, 6/8/16 2,000,474 1,000,000 AAA/NR AmeriCredit Automobile Receivables Trust, 0.51%, 1/8/16 999,871 1,181,240 NR/Aaa BMW Vehicle Owner Trust 2011-A, 0.76%, 8/25/15 1,184,312 3,257,431 1.20 AA-/NR Hyundai Capital Auto Funding VIII, Ltd., Floating Rate Note, 9/20/16 (144A) 3,264,272 The accompanying notes are an integral part of these financial statements. 22 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Automobile Manufacturers -- (continued) 124,866 AA/NR Santander Drive Auto Receivables Trust 2011-S2, 2.06%, 6/15/17 (144A) $ 125,754 118,317 AA-/NR Santander Drive Auto Receivables Trust 2011-S2, 2.86%, 6/15/17 (144A) 119,252 330,396 A+/NR Santander Drive Auto Receivables Trust 2011-S2, 3.35%, 6/15/17 (144A) 332,973 93,661 AAA/Aaa Santander Drive Auto Receivables Trust 2012-1, 1.25%, 4/15/15 93,906 980,182 AAA/Aaa Santander Drive Auto Receivables Trust 2012-2, 0.91%, 5/15/15 982,174 838,418 AAA/Aaa Santander Drive Auto Receivables Trust 2012-5, 0.57%, 12/15/15 838,812 -------------- $ 9,950,325 -------------- Total Automobiles & Components $ 9,950,325 ---------------------------------------------------------------------------------------------------------- CONSUMER SERVICES -- 0.1% Hotels, Resorts & Cruise Lines -- 0.1% 809,077 A/NR Westgate Resorts 2012-2 LLC, 3.0%, 1/20/25 (144A) $ 815,904 310,337 A/NR Westgate Resorts LLC, 2.5%, 3/20/25 (144A) 310,724 -------------- $ 1,126,628 -------------- Total Consumer Services $ 1,126,628 ---------------------------------------------------------------------------------------------------------- RETAILING -- 0.2% Automotive Retail -- 0.2% 393,141 AAA/Aaa Ford Credit Auto Owner Trust 2009-D, 2.98%, 8/15/14 $ 395,386 1,780,000 AAA/Aaa Hyundai Auto Receivables Trust 2013-A, 0.4%, 12/15/15 1,779,494 -------------- $ 2,174,880 -------------- Total Retailing $ 2,174,880 ---------------------------------------------------------------------------------------------------------- BANKS -- 9.6% Diversified Banks -- 0.0%+ 205,331 0.60 AA/Aaa KeyCorp Student Loan Trust 2004-A, Floating Rate Note, 10/28/41 $ 202,674 190,545 0.29 NR/Aa1 Wells Fargo Home Equity Asset-Backed Securities 2007-2 Trust, Floating Rate Note, 4/25/37 187,571 -------------- $ 390,245 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 23 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- 9.6% 471,138 0.38 BB+/B3 ACE Securities Corp Home Equity Loan Trust Series 2006-ASAP2, Floating Rate Note, 3/25/36 $ 455,127 497,586 AAA/NR Ally Auto Receivables Trust 2010-5, 1.11%, 1/15/15 498,361 100,000 AAA/Aaa Ally Auto Receivables Trust 2012-4, 0.48%, 5/15/15 100,048 659,858 AAA/Aaa Ally Auto Receivables Trust, 0.79%, 9/15/15 661,113 362,000 NR/Aaa AmeriCredit Automobile Receivables Trust 2011-3, 1.17%, 1/8/16 363,175 881,147 AAA/Aaa AmeriCredit Automobile Receivables Trust 2012-1, 0.91%, 10/8/15 882,932 620,000 0.53 A+/A3 Ameriquest Mortgage Securities, Inc. Asset Backed Pass-Through Certificates Series 2005-R11, Floating Rate Note, 1/25/36 609,518 475,844 0.65 AAA/Aaa Ameriquest Mortgage Securities, Inc. Asset-Backed Pass-Through Certificates Series 2004 R3, Floating Rate Note, 5/25/34 461,642 151,739 0.51 AA+/Aa1 Ameriquest Mortgage Securities, Inc. Asset-Backed Pass-Through Certificates Series 2004-R11, Floating Rate Note, 11/25/34 150,640 445,939 0.42 AA+/A2 Ameriquest Mortgage Securities, Inc. Asset-Backed Pass-Through Certificates Series 2005-R10, Floating Rate Note, 1/25/36 442,104 91,748 0.40 AA+/Aaa Ameriquest Mortgage Securities, Inc. Asset-Backed Pass-Through Certificates Series 2005-R6, Floating Rate Note, 8/25/35 89,495 325,573 0.75 AAA/NR ARI Fleet Lease Trust 2012-A, Floating Rate Note, 3/15/20 (144A) 326,597 723,702 0.50 AAA/NR ARI Fleet Lease Trust 2012-B, Floating Rate Note, 1/15/21 (144A) 721,927 1,260,000 NR/NR ARI Fleet Lease Trust, 0.7%, 12/15/15 (144A) 1,259,916 1,610,265 1.95 A/NR ARL First LLC, Floating Rate Note, 12/15/42 (144A) 1,643,477 405,625 NR/NR Ascentium Equipment Receivables LLC, 1.83%, 9/15/19 (144A) 405,584 78,793 AA+/A3 Bayview Financial Acquisition Trust, 6.205%, 5/28/37 (Step) 80,300 2,847,352 0.88 AAA/Aa1 Bayview Financial Acquisition Trust, Floating Rate Note, 2/28/44 2,795,613 74,100 0.83 AAA/Aaa Bayview Financial Acquisition Trust, Floating Rate Note, 5/28/44 73,071 The accompanying notes are an integral part of these financial statements. 24 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 575,477 0.79 AAA/Aaa Bayview Financial Acquisition Trust, Floating Rate Note, 8/28/44 $ 564,018 1,060,050 3.47 NR/NR Bayview Opportunity Master Fund IIa Trust 2012-4NPL, Floating Rate Note, 7/28/32 (144A) 1,088,502 6,857 0.45 AA+/Aa3 Bear Stearns Asset Backed Securities I Trust 2005-HE11, Floating Rate Note, 11/25/35 6,837 120,056 0.60 AAA/A1 Bear Stearns Asset Backed Securities Trust 2005-SD1, Floating Rate Note, 8/25/43 117,916 195,807 0.60 AA+/NR Bear Stearns Asset Backed Securities Trust 2005-SD2, Floating Rate Note, 3/25/35 192,734 103,642 AA/NR CarNow Auto Receivables Trust 2012-1, 2.09%, 1/15/15 (144A) 103,678 1,723,755 0.94 AA/A3 Carrington Mortgage Loan Trust Series 2005-NC1, Floating Rate Note, 2/25/35 1,690,332 107,578 0.60 AA+/Baa1 Carrington Mortgage Loan Trust Series 2005-NC4, Floating Rate Note, 9/25/35 105,474 2,670,495 0.38 BBB-/Ba3 Carrington Mortgage Loan Trust Series 2006-OPT1, Floating Rate Note, 2/25/36 2,608,991 267,031 0.32 A+/Ba1 Carrington Mortgage Loan Trust Series 2007-FRE1, Floating Rate Note, 2/25/37 264,916 752,418 3.65 AA+/Aaa Centex Home Equity Loan Trust 2003-A, Floating Rate Note, 3/25/33 751,403 1,444,055 0.35 BB/Ba3 Citigroup Mortgage Loan Trust 2007-WFH2, Floating Rate Note, 3/25/37 1,440,650 91,230 0.92 AAA/Aa2 Citigroup Mortgage Loan Trust, Inc., Floating Rate Note, 10/25/34 91,162 897,755 1.22 BBB-/Caa1 Citigroup Mortgage Loan Trust, Inc., Floating Rate Note, 11/25/34 847,031 51,192 0.60 AA+/NR Citigroup Mortgage Loan Trust, Inc., Floating Rate Note, 5/25/35 (144A) 50,539 326,153 0.61 AAA/A3 Citigroup Mortgage Loan Trust, Inc., Floating Rate Note, 7/25/35 326,032 129,261 NR/NR Conn Funding II LP, 4.0%, 4/15/16 (Step) (144A) 129,342 23,136 NR/Baa3 Conseco Financial Corp., 7.05%, 1/15/19 23,425 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 25 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 50,530 0.57 AA+/A2 Countrywide Asset-Backed Certificates, Floating Rate Note, 1/25/36 $ 50,341 3,124,053 1.04 AA/A3 Countrywide Asset-Backed Certificates, Floating Rate Note, 10/25/34 3,109,532 847,949 0.59 AAA/Aa3 Countrywide Asset-Backed Certificates, Floating Rate Note, 11/25/34 824,146 2,000,000 0.90 BBB-/Ba1 Countrywide Asset-Backed Certificates, Floating Rate Note, 12/25/34 1,979,180 393,378 0.69 BBB+/A3 Countrywide Asset-Backed Certificates, Floating Rate Note, 12/25/35 391,073 2,137,677 0.44 BB+/Ba2 Countrywide Asset-Backed Certificates, Floating Rate Note, 4/25/36 2,121,196 1,656,429 1.10 A+/Baa1 Countrywide Asset-Backed Certificates, Floating Rate Note, 5/25/35 1,633,072 449,719 0.31 BBB-/Ba3 Countrywide Asset-Backed Certificates, Floating Rate Note, 5/25/37 448,433 151,834 0.31 BB+/B1 Countrywide Asset-Backed Certificates, Floating Rate Note, 5/25/47 151,350 205,118 0.88 AAA/A1 Countrywide Asset-Backed Certificates, Floating Rate Note, 6/25/33 (144A) 200,408 50,182 1.10 AAA/A2 Countrywide Asset-Backed Certificates, Floating Rate Note, 6/25/33 (144A) 47,488 841,445 0.71 AA+/A1 Countrywide Asset-Backed Certificates, Floating Rate Note, 6/25/35 825,189 953,153 0.64 A+/A3 Countrywide Asset-Backed Certificates, Floating Rate Note, 7/25/35 952,179 466,717 0.55 BB+/Ba2 Countrywide Asset-Backed Certificates, Floating Rate Note, 8/25/47 463,328 638,465 0.55 BBB-/Ba3 Countrywide Home Equity Loan Trust, Floating Rate Note, 3/15/29 630,855 595,760 0.46 BBB/B2 Countrywide Home Equity Loan Trust, Floating Rate Note, 6/15/29 582,519 2,000,000 AA/NR Credit Acceptance Auto Loan Trust, 2.21%, 9/15/20 (144A) 2,019,026 488,445 4.30 BBB/Baa2 Drug Royalty II LP 1 2012-1, Floating Rate Note, 1/15/25 (144A) 488,445 1,101,939 1.20 BBB/Ba1 Ellington Loan Acquisition Trust 2007-1, Floating Rate Note, 5/26/37 (144A) 1,105,665 109,211 1.00 BBB/Ba1 Ellington Loan Acquisition Trust 2007-1, Floating Rate Note, 5/27/37 (144A) 108,033 2,400,000 1.10 B-/Caa3 Ellington Loan Acquisition Trust 2007-1, Floating Rate Note, 5/28/37 (144A) 2,268,276 226,837 AA/NR Exeter Automobile Receivables Trust 2012-1, 2.02%, 8/15/16 (144A) 228,055 The accompanying notes are an integral part of these financial statements. 26 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 778,517 AA/NR Exeter Automobile Receivables Trust 2012-2, 1.3%, 6/15/17 (144A) $ 780,568 1,000,000 BBB/NR Exeter Automobile Receivables Trust 2012-2, 3.06%, 7/16/18 (144A) 1,013,775 910,581 0.57 AAA/Aa3 First Frankin Mortgage Loan Trust 2005-FF7, Floating Rate Note, 7/25/35 903,121 1,565,273 0.71 NR/Baa1 First Frankin Mortgage Loan Trust 2005-FFH3, Floating Rate Note, 9/25/35 1,536,982 152,686 0.74 AAA/NR First Franklin Mortgage Loan Trust 2004-FF10, Floating Rate Note, 9/25/34 152,004 409,681 0.26 A/Aa1 First Franklin Mortgage Loan Trust 2006-FF14, Floating Rate Note, 10/25/36 409,114 417,167 0.46 BBB+/B1 First Franklin Mortgage Loan Trust Series 2005-FF12, Floating Rate Note, 11/25/36 404,989 358,342 0.66 AA+/A3 Fremont Home Loan Trust 2005-2, Floating Rate Note, 6/25/35 352,658 1,277,820 0.85 A+/A3 Fremont Home Loan Trust 2005-B, Floating Rate Note, 4/25/35 1,251,007 1,723,107 0.64 AAA/B1 GreenPoint Mortgage Funding Trust 2005-HE4, Floating Rate Note, 7/25/30 1,707,566 760,341 0.92 AAA/B1 GreenPoint Mortgage Funding Trust 2005-HE4, Floating Rate Note, 7/25/30 754,797 1,955,443 0.75 AAA/Aaa GSAMP Trust 2004-SEA2, Floating Rate Note, 3/25/34 1,947,569 3,898,600 0.85 BBB/A3 GSAMP Trust 2004-SEA2, Floating Rate Note, 3/25/34 3,855,205 3,334,418 0.50 A/NR GSAMP Trust 2006-SEA1, Floating Rate Note, 5/25/36 (144A) 3,282,922 2,000,000 AAA/NR HLSS Servicer Advance Receivables Backed Notes, 0.898%, 1/15/44 (144A) 2,002,000 1,586,000 AAA/NR HLSS Servicer Advance Receivables Backed Notes, 1.34%, 10/15/43 (144A) 1,589,965 750,000 A/NR HLSS Servicer Advance Receivables Backed Notes, 1.644%, 1/15/44 (144A) 751,875 500,000 BBB/NR HLSS Servicer Advance Receivables Backed Notes, 2.487%, 1/15/44 (144A) 501,400 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 27 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 259,641 AAA/Aaa Honda Auto Receivables 2010-1 Owner Trust, 1.98%, 5/23/16 $ 259,893 1,375,000 AAA/NR Honda Auto Receivables Owner Trust 2013-1, 0.35%, 6/22/15 1,374,612 82,757 0.46 AAA/Aa2 Lehman XS Trust Series 2005-6, Floating Rate Note, 11/25/35 82,505 500,000 2.45 A+/Baa1 Madison Avenue Manufactured Housing Contract, Floating Rate Note, 3/25/32 502,786 2,586,998 0.50 A/NR Mastr Specialized Loan Trust, Floating Rate Note, 1/25/36 (144A) 2,403,552 139,227 NR/Aaa MMAF Equipment Finance LLC 2011-A, 0.9%, 4/15/14 (144A) 139,252 146,658 0.40 BBB-/Baa1 Morgan Stanley ABS Capital I Inc Trust 2006-WMC1, Floating Rate Note, 12/25/35 145,706 454,183 0.28 CCC/Baa1 Morgan Stanley Structured Trust, Floating Rate Note, 6/25/37 444,839 2,250,000 AAA/NR Nationstar Agency Advance Funding Trust 2013-T1A, 0.997%, 2/15/45 (144A) 2,253,060 1,240,000 5.46 AAA/Aa3 Origen Manufactured Housing Contract Trust 2004-B, Floating Rate Note, 11/15/35 1,303,464 1,829,064 NR/A2 Oxford Finance Funding Trust 2012-1, 3.9%, 3/15/17 (144A) 1,845,068 582,380 1.14 AA+/A1 Park Place Securities, Inc. Asset-Backed Pass-Through Certificates Series 2004-MCW, Floating Rate Note, 10/25/34 569,090 504,889 1.25 AAA/A3 Park Place Securities, Inc. Asset-Backed Pass-Through Certificates Series 2004-MHQ, Floating Rate Note, 12/25/34 504,971 939,517 0.82 AA+/A3 Park Place Securities, Inc. Asset-Backed Pass-Through Certificates Series 2004-WCW2, Floating Rate Note, 10/25/34 937,986 949,008 0.88 AA+/A3 Park Place Securities, Inc. Asset-Backed Pass-Through Certificates Series 2004-WWF, Floating Rate Note, 12/25/34 947,680 1,398,699 0.57 BBB+/Ba3 Park Place Securities, Inc. Asset-Backed Pass-Through Certificates Series 2005-WHQ4, Floating Rate Note, 9/25/35 1,388,441 The accompanying notes are an integral part of these financial statements. 28 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 2,035,723 0.90 AAA/Aaa PFS Financing Corp., Floating Rate Note, 10/17/16 (144A) $ 2,045,448 325,276 1.70 A/NR PFS Financing Corp., Floating Rate Note, 10/17/16 (144A) 327,868 3,546,000 1.40 AAA/Aaa PFS Financing Corp., Floating Rate Note, 2/15/16 (144A) 3,569,162 2,340,000 0.75 AAA/Aaa PFS Financing Corp., Floating Rate Note, 2/15/18 (144A) 2,339,951 2,000,000 1.00 BBB+/Ba3 RAAC Series 2005-RP3 Trust, Floating Rate Note, 5/25/39 (144A) 1,922,556 1,537,208 0.50 AA+/A1 RAAC Series 2006-RP1 Trust, Floating Rate Note, 10/25/45 (144A) 1,524,977 3,129,656 0.45 B/Ba3 RAAC Series 2006-RP2 Trust, Floating Rate Note, 2/25/37 (144A) 3,007,267 459,822 0.39 A-/A2 RAAC Series 2006-SP1 Trust, Floating Rate Note, 9/25/45 451,547 363,463 0.82 AA+/Baa1 RAMP Series 2004-RS11 Trust, Floating Rate Note, 11/25/34 355,197 15,130 AA+/Baa2 RAMP Series 2004-RS8 Trust, 5.06%, 6/25/32 (Step) 15,273 71,768 0.49 A+/Baa2 RAMP Series 2005-RS8 Trust, Floating Rate Note, 10/25/33 71,139 305,229 0.47 AA+/A1 RAMP Series 2005-RZ3 Trust, Floating Rate Note, 9/25/35 302,967 112,058 0.40 AA+/A3 RAMP Series 2006-EFC1 Trust, Floating Rate Note, 2/25/36 109,106 598,851 0.39 B+/B2 RAMP Series 2006-NC1 Trust, Floating Rate Note, 1/25/36 583,770 402,685 0.42 BBB+/Baa3 RASC Series 2006-KS1 Trust, Floating Rate Note, 2/25/36 394,165 488,864 0.65 NR/Aa1 RFSC Series 2003-RP2 Trust, Floating Rate Note, 6/25/33 (144A) 476,600 2,000,000 1.20 NR/Aa2 RFSC Series 2003-RP2 Trust, Floating Rate Note, 7/25/41 (144A) 1,950,468 170,647 0.68 AAA/NR Salomon Brothers Mortgage Securities VII, Inc., Floating Rate Note, 3/25/28 166,435 658,653 AAA/NR Santander Drive Auto Receivables Trust 2010-1, 1.84%, 11/17/14 662,338 75,643 A/NR Santander Drive Auto Receivables Trust 2010-1, 1.89%, 5/15/17 (144A) 76,014 1,945,000 0.66 A+/A3 Saxon Asset Securities Trust 2005-3, Floating Rate Note, 11/25/35 1,872,222 627,383 0.31 BBB-/Ba3 Saxon Asset Securities Trust 2006-3, Floating Rate Note, 10/25/46 623,149 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 29 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 39,521 0.40 AAA/Aaa SLC Student Loan Trust 2004-1, Floating Rate Note, 8/15/19 $ 39,524 76,556 0.29 AAA/Aaa SLC Student Loan Trust 2005-3, Floating Rate Note, 6/15/20 76,506 468,463 0.75 NR/Aaa SMART Trust/Australia, Floating Rate Note, 3/14/15 (144A) 469,100 1,800,000 0.53 NR/Aaa SMART Trust/Australia, Floating Rate Note, 6/14/15 1,800,914 1,785,000 0.65 NR/Aaa SMART Trust/Australia, Floating Rate Note, 9/14/16 1,790,455 836,321 AA/NR SNAAC Auto Receivables Trust, 1.78%, 6/15/16 (144A) 841,101 1,226,629 0.65 AA/A3 Soundview Home Loan Trust 2005-DO1, Floating Rate Note, 5/25/35 1,221,839 1,295,868 0.46 BB+/NR Soundview Home Loan Trust 2005-OPT4, Floating Rate Note, 12/25/35 1,282,265 593,744 0.39 AA+/Aaa South Carolina Student Loan Corp., Floating Rate Note, 12/3/18 593,750 1,166,729 NR/NR Stanwich Mortgage Loan Co 2012-NPL4 LLC, 2.981%, 9/15/42 (144A) 1,169,645 459,831 0.60 AA+/Aa1 Structured Asset Investment Loan Trust 2005-4, Floating Rate Note, 5/25/35 456,804 1,760,265 0.40 CCC/Ba3 Structured Asset Investment Loan Trust 2006-1, Floating Rate Note, 1/25/36 1,718,263 1,037,208 0.31 BBB+/A3 Structured Asset Securities Corp Mortgage Loan Trust 2006-BC4, Floating Rate Note, 12/25/36 1,029,156 4,446,741 0.35 B-/B2 Structured Asset Securities Corp Mortgage Loan Trust 2006-EQ1, Floating Rate Note, 7/25/36 (144A) 4,358,486 3,973,505 0.42 B-/Baa3 Structured Asset Securities Corp Mortgage Loan Trust 2006-GEL4, Floating Rate Note, 10/25/36 (144A) 3,830,685 477,422 0.26 BB/A3 Structured Asset Securities Corp Mortgage Loan Trust 2007-BC3, Floating Rate Note, 5/25/47 468,115 327,090 0.35 BB/Ba3 Structured Asset Securities Corp Mortgage Loan Trust 2007-GEL2, Floating Rate Note, 5/25/37 (144A) 321,963 1,230,000 AAA/NR United Auto Credit Securitization Trust, 1.1%, 3/16/15 (144A) 1,230,260 48,447 0.48 NR/Baa1 Wilshire Mortgage Loan Trust, Floating Rate Note, 5/25/28 47,122 -------------- $ 126,945,405 -------------- Total Banks $ 127,335,650 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 30 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 6.9% Other Diversified Financial Services -- 1.6% 1,815,847 0.88 AA/A3 Asset Backed Securities Corp Home Equity Loan Trust Series 2005-HE2, Floating Rate Note, 2/25/35 $ 1,799,666 899,000 0.71 AA/A3 Asset Backed Securities Corp Home Equity Loan Trust Series OOMC 2005-HE6, Floating Rate Note, 7/25/35 889,074 1,495,000 NR/Aaa BMW Vehicle Lease Trust 2013-1, 0.4%, 1/20/15 1,494,007 1,750,000 AAA/Aaa Capital Auto Receivables Asset Trust 2013-1, 0.47%, 3/20/15 1,748,436 85,797 0.47 A+/Baa2 Credit Suisse Mortgage Capital Certificates, Floating Rate Note, 10/25/36 (144A) 84,522 664,018 AA/NR Direct Capital Funding IV LLC, 1.673%, 12/20/17 (144A) 664,018 194,128 A+/NR DT Auto Owner Trust 2011-2, 3.05%, 2/16/16 (144A) 194,579 1,131,387 AAA/NR DT Auto Owner Trust 2012-1, 1.05%, 1/15/15 (144A) 1,132,525 978,664 1.10 BB+/Ba2 Ellington Loan Acquisition Trust 2007-2, Floating Rate Note, 5/25/37 (144A) 963,814 1,000,000 A+/NR First Investors Auto Owner Trust 2011-1, 7.17%, 2/15/18 (144A) 1,044,795 500,000 0.45 BBB+/Baa3 GE Seaco Finance Srl, Floating Rate Note, 11/17/20 (144A) 493,824 533,266 0.37 BB+/Baa2 Home Equity Asset Trust 2006-4, Floating Rate Note, 8/25/36 522,747 274,809 0.35 BB/Ba1 JP Morgan Mortgage Acquisition Trust 2006-ACC1, Floating Rate Note, 5/25/36 266,952 152,105 BBB+/Ba1 JP Morgan Mortgage Acquisition Trust 2007-CH1, 5.453%, 11/25/36 (Step) 151,773 696,383 0.26 BB+/Ba2 JP Morgan Mortgage Acquisition Trust 2007-CH4, Floating Rate Note, 12/25/29 686,310 94,279 0.45 AA+/Aaa Nelnet Student Loan Trust 2004-3, Floating Rate Note, 1/25/21 94,291 1,075,316 0.37 AA+/Aaa Nelnet Student Loan Trust 2005-1, Rate Note, 10/26/20 1,072,844 1,239,711 3.96 A/NR Newtek Small Business Loan Trust, Floating Rate Note, 7/25/38 (144A) 1,239,711 2,570,000 0.30 NR/Aaa Nissan Auto Lease Trust, Floating Rate Note, 6/15/15 2,570,000 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 31 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Other Diversified Financial Services -- (continued) 860,015 AAA/NR Prestige Auto Receivables Trust 2012-1, 1.23%, 12/15/15 (144A) $ 863,189 981,424 0.38 CCC/Caa1 RASC Series 2007-KS3 Trust, Floating Rate Note, 4/25/37 959,476 986,476 0.96 AA/B2 SACO I Trust 2005-8, Floating Rate Note, 11/25/35 975,443 785,498 0.35 AA-/A3 Sierra Timeshare 2007-1 Receivables Funding LLC, Floating Rate Note, 3/20/19 (144A) 784,980 468,953 1.20 A+/Baa3 Sierra Timeshare 2007-2 Receivables Funding LLC, Floating Rate Note, 9/20/19 (144A) 465,321 563,333 0.45 A-/Baa1 Textainer Marine Containers, Ltd., Floating Rate Note, 5/15/20 (144A) 558,276 -------------- $ 21,720,573 ---------------------------------------------------------------------------------------------------------- Specialized Finance -- 0.6% 608,000 AAA/Aaa Ally Master Owner Trust, 2.88%, 4/15/15 (144A) $ 608,632 2,400,000 1.07 AAA/Aaa Ally Master Owner Trust, Floating Rate Note, 1/15/16 2,412,869 250,000 1.00 AAA/Aaa Ally Master Owner Trust, Floating Rate Note, 2/15/17 251,908 888,000 0.64 NR/Aaa GE Dealer Floorplan Master Note Trust, Floating Rate Note, 10/20/17 889,833 350,000 0.77 NR/Aaa GE Dealer Floorplan Master Note Trust, Floating Rate Note, 2/20/17 351,868 2,000,000 0.69 NR/Aaa GE Dealer Floorplan Master Note Trust, Floating Rate Note, 6/20/17 2,009,014 500,000 1.10 NR/Aa2 GE Dealer Floorplan Master Note Trust, Floating Rate Note, 6/20/17 500,000 250,000 0.80 NR/Aaa GE Dealer Floorplan Master Note Trust, Floating Rate Note, 7/20/16 251,598 371,389 NR/A2 Hercules Capital Funding Trust 2012-1, 3.32%, 12/16/17 (144A) 373,014 -------------- $ 7,648,736 ---------------------------------------------------------------------------------------------------------- Consumer Finance -- 3.7% 498,359 A+/NR American Credit Acceptance Receivables Trust 2012-2, 1.89%, 7/15/16 (144A) $ 500,244 1,000,000 A+/NR American Credit Acceptance Receivables Trust, 1.45%, 4/16/18 (144A) 999,430 1,105,180 A+/NR American Credit Acceptance Receivables Trust, 1.64%, 11/15/16 (144A) 1,105,110 780,000 0.80 AA+/A2 American Express Credit Account Master Trust, Floating Rate Note, 11/16/15 780,164 The accompanying notes are an integral part of these financial statements. 32 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Consumer Finance -- (continued) 550,000 1.50 AAA/Aaa American Express Credit Account Master Trust, Floating Rate Note, 3/15/16 $ 552,736 2,945,000 1.45 AAA/Aaa American Express Credit Account Master Trust, Floating Rate Note, 3/15/17 2,993,433 1,090,000 0.35 AAA/NR American Express Credit Account Master Trust, Floating Rate Note, 3/15/18 1,090,843 100,000 0.32 AAA/Aaa American Express Credit Account Master Trust, Floating Rate Note, 6/15/16 100,040 6,150,000 0.27 AAA/Aaa BA Credit Card Trust, Floating Rate Note, 12/15/16 6,156,181 3,443,000 0.26 AAA/Aaa BA Credit Card Trust, Floating Rate Note, 4/15/16 3,443,448 415,000 0.23 AAA/Aaa BA Credit Card Trust, Floating Rate Note, 5/16/16 414,970 945,974 NR/Aa3 California Republic Auto Receivables Trust 2012-1, 1.18%, 8/15/17 (144A) 945,499 2,512,000 0.42 AAA/Aaa Capital One Multi-Asset Execution Trust, Floating Rate Note, 3/15/17 2,514,876 1,220,000 0.23 AAA/Aaa Capital One Multi-Asset Execution Trust, Floating Rate Note, 4/15/16 1,219,972 776,237 AA-/A1 CPS Auto Trust, 1.82%, 12/16/19 (144A) 779,831 540,000 0.40 AAA/Aaa Discover Card Master Trust, Floating Rate Note, 1/16/18 540,626 500,000 0.41 AAA/Aaa Discover Card Master Trust, Floating Rate Note, 11/16/15 500,120 4,673,000 0.55 NR/Aaa Discover Card Master Trust, Floating Rate Note, 8/15/16 4,683,360 3,240,000 1.70 AA-/Aa2 Ford Credit Floorplan Master Owner Trust, Floating Rate Note, 1/15/16 3,261,011 2,657,000 2.30 BBB/A1 Ford Credit Floorplan Master Owner Trust, Floating Rate Note, 1/15/16 2,673,104 1,300,000 0.80 AAA/Aaa Ford Credit Floorplan Master Owner Trust, Floating Rate Note, 9/15/15 1,302,544 2,075,000 0.55 AAA/Aaa Ford Credit Floorplan Master Owner Trust, Floating Rate Note, 9/15/16 2,079,003 250,000 0.60 AAA/Aaa Golden Credit Card Trust, Floating Rate Note, 10/15/15 (144A) 250,025 2,000,000 0.26 AAA/Aaa MBNA Credit Card Master Note Trust, Floating Rate Note, 10/15/15 1,999,806 1,000,000 0.48 NR/Aaa Mercedes-Benz Master Owner Trust, Floating Rate Note, 11/15/16 (144A) 1,000,000 1,000,000 NR/Aaa Nissan Auto Receivables Owner Trust, 0.37%, 9/15/15 999,716 674,932 0.98 BBB+/Ba3 NovaStar Mortgage Funding Trust Series 2003-1, Floating Rate Note, 5/25/33 664,028 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 33 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Consumer Finance -- (continued) 97,673 A+/Baa1 Santander Consumer Acquired Receivables Trust 2011-S1, 3.15%, 8/15/16 (144A) $ 98,286 100,794 0.70 AAA/Aaa SLM Student Loan Trust 2004-10, Floating Rate Note, 7/27/20 (144A) 100,794 489,490 0.43 AAA/Aaa SLM Student Loan Trust 2004-3, Floating Rate Note, 4/25/19 489,472 1,820,000 AAA/NR Volvo Financial Equipment LLC, 0.53%, 11/16/15 (144A) 1,818,963 2,000,000 0.33 AAA/Aa2 World Financial Network Credit Card Master Trust, Floating Rate Note, 2/15/17 (144A) 1,999,940 800,000 0.41 AA/A3 World Financial Network Credit Card Master Trust, Floating Rate Note, 2/15/17 (144A) 799,624 -------------- $ 48,857,199 ---------------------------------------------------------------------------------------------------------- Asset Management & Custody Banks -- 0.1% 1,326,233 0.37 BBB/Baa2 Triton Container Finance LLC, Floating Rate Note, 11/26/21 (144A) $ 1,301,734 308,344 0.34 BBB/Baa2 Triton Container Finance LLC, Floating Rate Note, 2/26/19 (144A) 305,685 -------------- $ 1,607,419 ---------------------------------------------------------------------------------------------------------- Investment Banking & Brokerage -- 0.9% 2,000,000 0.95 AAA/Aaa Chesapeake Funding LLC, Floating Rate Note, 11/7/23 (144A) $ 2,008,488 250,000 2.20 A/A1 Chesapeake Funding LLC, Floating Rate Note, 11/7/23 (144A) 252,270 2,050,000 1.45 AAA/Aaa Chesapeake Funding LLC, Floating Rate Note, 4/7/24 (144A) 2,077,931 2,000,000 0.65 NR/Aaa Chesapeake Funding LLC, Floating Rate Note, 5/7/24 (144A) 1,999,668 200,000 1.35 NR/Aa2 Chesapeake Funding LLC, Floating Rate Note, 5/7/24 (144A) 200,000 353,365 1.95 AAA/Aaa Chesapeake Funding LLC, Floating Rate Note, 9/15/21 (144A) 354,859 700,000 1.95 AA+/Aaa Chesapeake Funding LLC, Floating Rate Note, 9/15/21 (144A) 704,386 2,400,000 1.95 AA-/Aa1 Chesapeake Funding LLC, Floating Rate Note, 9/15/21 (144A) 2,412,984 1,317,905 0.38 BBB/Baa3 CLI Funding LLC, Floating Rate Note, 8/18/21 (144A) 1,298,222 -------------- $ 11,308,808 -------------- Total Diversified Financials $ 91,142,735 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 34 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- REAL ESTATE -- 0.0%+ Real Estate Services -- 0.0%+ 20,438 0.94 AAA/A1 Chase Funding Trust Series 2002-4, Floating Rate Note, 10/25/32 $ 18,913 -------------- Total Real Estate $ 18,913 ---------------------------------------------------------------------------------------------------------- TOTAL ASSET BACKED SECURITIES (Cost $321,996,008) $ 323,879,465 ---------------------------------------------------------------------------------------------------------- COLLATERALIZED MORTGAGE OBLIGATIONS -- 31.3% CONSUMER SERVICES -- 0.1% Hotels, Resorts & Cruise Lines -- 0.1% 1,000,000 AAA/NR Motel 6 Trust, 1.5%, 10/5/25 (144A) $ 1,004,258 268,785 NR/Baa3 S2 Hospitality LLC, 4.5%, 4/15/25 (144A) 268,852 -------------- $ 1,273,110 -------------- Total Consumer Services $ 1,273,110 ---------------------------------------------------------------------------------------------------------- BANKS -- 15.2% Thrifts & Mortgage Finance -- 15.2% 631,515 2.75 AA+/Baa1 Adjustable Rate Mortgage Trust 2004-1, Floating Rate Note, 1/25/35 $ 626,153 300,000 0.98 AAA/A1 Adjustable Rate Mortgage Trust 2005-2, Floating Rate Note, 6/25/35 291,646 1,573,505 0.48 A+/Ba1 Adjustable Rate Mortgage Trust 2005-5, Floating Rate Note, 9/25/35 1,446,671 33,093 0.60 AA+/Aaa Alternative Loan Trust 2002-18, Floating Rate Note, 2/25/33 32,617 956,671 0.83 BBB+/NR Alternative Loan Trust 2003-3T1, Floating Rate Note, 5/25/33 927,145 234,496 0.75 A+/NR Alternative Loan Trust 2003-9T1, Floating Rate Note, 7/25/33 232,920 104,561 0.65 BBB+/Ba1 Alternative Loan Trust 2004-18CB, Floating Rate Note, 9/25/34 103,718 650,062 BBB+/Ba3 Alternative Loan Trust 2004-2CB, 5.125%, 3/25/34 658,221 94,066 0.60 BBB+/Ba3 Alternative Loan Trust 2004-2CB, Floating Rate Note, 3/25/34 91,812 1,314,531 BB+/Ba2 Alternative Loan Trust 2004-4CB, 4.25%, 4/25/34 1,322,722 1,198,759 0.49 BBB+/Ba1 Alternative Loan Trust 2004-6CB, Floating Rate Note, 5/25/34 1,090,239 35,097 0.59 AAA/Aaa Alternative Loan Trust 2004-J9, Floating Rate Note, 10/25/34 34,741 69,826 5.75 NR/NR American General Mortgage Loan Trust 2009-1, Floating Rate Note, 9/25/48 (144A) 69,794 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 35 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 2,350,000 1.69 AAA/Aaa Arkle Master Issuer Plc, Floating Rate Note, 5/17/60 (144A) $ 2,360,138 500,000 1.54 AAA/Aaa Arkle Master Issuer Plc, Floating Rate Note, 5/17/60 (144A) 501,866 2,275,000 1.35 NR/Aaa BAMLL Commercial Mortgage Securities Trust 2012-CLRN, Floating Rate Note, 8/15/29 (144A) 2,294,802 3,035,000 2.30 NR/A2 BAMLL Commercial Mortgage Securities Trust 2012-CLRN, Floating Rate Note, 8/15/29 (144A) 3,084,555 2,314,647 0.41 A/NR Banc of America Funding 2010-R4 Trust, Floating Rate Note, 6/26/37 (144A) 2,293,882 1,143,841 0.30 AAA/NR Banc of America Funding 2010-R4 Trust, Floating Rate Note, 9/26/46 (144A) 1,134,328 3,169,028 0.95 AA+/Aa1 Banc of America Large Loan Trust 2007-BMB1, Floating Rate Note, 8/15/29 (144A) 3,121,854 3,000,000 1.30 A-/A3 Banc of America Large Loan Trust 2007-BMB1, Floating Rate Note, 8/15/29 (144A) 2,927,412 144,132 3.16 NR/WR Banc of America Mortgage 2003-A Trust, Floating Rate Note, 2/25/33 141,230 551,862 3.00 NR/B2 Banc of America Mortgage 2004-I Trust, Floating Rate Note, 10/25/34 539,650 230,090 0.47 AAA/Aaa Bayview Commercial Asset Trust, Floating Rate Note, 4/25/36 (144A) 229,782 996,941 2.98 NR/NR Bayview Opportunity Master Fund Trust IIB LP, Floating Rate Note, 1/28/33 (144A) 1,004,518 288,369 2.98 NR/NR BCAP LLC 2010-RR11-I Trust, Floating Rate Note, 6/27/36 (144A) 288,727 93,968 4.78 A+/Baa3 Bear Stearns ALT-A Trust 2003-3, Floating Rate Note, 10/25/33 93,598 2,862,991 0.80 A+/Ba3 Bear Stearns ALT-A Trust 2004-4, Floating Rate Note, 6/25/34 2,670,501 655,063 5.36 AA+/Ba2 Bear Stearns ARM Trust 2004-1, Floating Rate Note, 4/25/34 646,940 827,504 2.24 A+/Ba2 Bear Stearns ARM Trust 2005-5, Floating Rate Note, 8/25/35 831,164 410,064 1.30 A+/Ba1 Bear Stearns Asset Backed Securities Trust 2003-AC5, Floating Rate Note, 10/25/33 373,296 1,469,236 AAA/Aaa Bear Stearns Commercial Mortgage Securities Trust 2004-PWR6, 4.705%, 11/11/41 1,497,226 The accompanying notes are an integral part of these financial statements. 36 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 2,329,333 0.40 A+/Baa1 Chevy Chase Funding LLC Mortgage-Backed Certificates Series 2005-A, Floating Rate Note, 1/25/36 (144A) $ 1,968,286 673,662 0.75 NR/Aa1 CHL Mortgage Pass-Through Trust 2003-11, Floating Rate Note, 5/25/33 652,999 1,344,489 0.70 A-/NR CHL Mortgage Pass-Through Trust 2003-15, Floating Rate Note, 6/25/18 1,319,509 141,201 0.60 A+/NR CHL Mortgage Pass-Through Trust 2003-J7, Floating Rate Note, 8/25/18 135,749 2,411,836 0.74 AA+/Baa1 CHL Mortgage Pass-Through Trust 2004-29, Floating Rate Note, 2/25/35 2,297,269 867,746 NR/Baa3 CHL Mortgage Pass-Through Trust 2004-9, 5.25%, 6/25/34 895,565 83,648 A+/NR CHL Mortgage Pass-Through Trust 2004-J9, 5.25%, 1/25/35 83,550 898,415 NR/Caa1 CHL Mortgage Pass-Through Trust 2005-19, 5.5%, 8/25/35 918,731 2,500,000 5.36 AAA/Aaa Citigroup Commercial Mortgage Trust 2004-C1, Floating Rate Note, 4/15/40 2,593,228 13,329 0.34 AAA/Aaa Citigroup Commercial Mortgage Trust 2007-FL3A, Floating Rate Note, 4/15/22 (144A) 13,188 1,238,868 0.37 AA/Aaa Citigroup Commercial Mortgage Trust 2007-FL3A, Floating Rate Note, 4/15/22 (144A) 1,204,772 1,772,180 0.41 A/Aa2 Citigroup Commercial Mortgage Trust 2007-FL3A, Floating Rate Note, 4/15/22 (144A) 1,705,684 301,158 0.45 BBB/A2 Citigroup Commercial Mortgage Trust 2007-FL3A, Floating Rate Note, 4/15/22 (144A) 287,690 881,059 0.50 BB/A3 Citigroup Commercial Mortgage Trust 2007-FL3A, Floating Rate Note, 4/15/22 (144A) 824,564 26,738 AAA/NR Citigroup Mortgage Loan Trust, Inc., 6.5%, 6/25/16 27,338 950,000 4.65 AA-/A1 City Center Trust 2011-CCHP, Floating Rate Note, 7/15/28 (144A) 955,310 640,643 0.64 BBB+/A2 CNL Commercial Mortgage Loan Trust 2003-2, Floating Rate Note, 10/25/30 (144A) 570,172 80,314 0.54 AAA/Aaa COMM 2005-FL11 Mortgage Trust, Floating Rate Note, 11/15/17 (144A) 74,593 143,761 0.59 AA-/Aa1 COMM 2005-FL11 Mortgage Trust, Floating Rate Note, 11/15/17 (144A) 132,083 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 37 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 69,135 NR/Aaa COMM 2006-C8 Mortgage Trust, 5.248%, 12/10/46 $ 69,674 740,006 0.30 AAA/Aaa COMM 2006-FL12 Mortgage Trust, Floating Rate Note, 12/15/20 (144A) 730,072 3,365,000 0.33 AA-/A1 COMM 2006-FL12 Mortgage Trust, Floating Rate Note, 12/15/20 (144A) 3,224,528 1,448,347 0.37 BBB/A3 COMM 2006-FL12 Mortgage Trust, Floating Rate Note, 12/15/20 (144A) 1,382,672 2,436,426 0.38 A+/A1 COMM 2007-FL14 Mortgage Trust, Floating Rate Note, 6/15/22 (144A) 2,400,605 290,956 3.64 NR/A2 COMM 2011-FL1 Mortgage Trust, Floating Rate Note, 7/17/28 (144A) 295,284 2,237,263 2.14 AAA/NR Commercial Mortgage Pass Through Certificates, Floating Rate Note, 11/17/26 (144A) 2,268,594 900,000 0.90 AAA/Aaa Extended Stay America Trust 2013-ESH, Floating Rate Note, 12/5/31 (144A) 900,765 800,000 1.30 AA-/NR Extended Stay America Trust 2013-ESH, Floating Rate Note, 12/5/31 (144A) 800,000 1,009,206 2.62 A+/NR First Horizon Mortgage Pass-Through Trust 2003-AR3, Floating Rate Note, 9/25/33 1,012,887 106,214 0.63 AA+/Aa2 GE Business Loan Trust 2003-1, Floating Rate Note, 4/15/31 (144A) 101,001 1,361,938 0.42 AA-/Aa1 GE Business Loan Trust 2004-2, Floating Rate Note, 12/15/32 (144A) 1,298,626 2,394,111 0.37 A/Aa3 GE Business Loan Trust 2007-1, Floating Rate Note, 4/16/35 (144A) 2,198,254 1,169,674 NR/Aaa GE Capital Commercial Mortgage Corp., 5.145%, 7/10/37 1,175,674 2,400,000 5.36 NR/Baa2 GE Capital Commercial Mortgage Corp., Floating Rate Note, 7/10/37 (144A) 2,417,117 217,589 0.52 A+/Baa2 Global Mortgage Securitization, Ltd., Floating Rate Note, 11/25/32 (144A) 202,701 2,133,028 AAA/Aaa GMAC Commercial Mortgage Securities Inc Series 2003-C3 Trust, 5.023%, 4/10/40 2,169,053 99,040 6.02 NR/NR GMAC Commercial Mortgage Securities, Inc., Floating Rate Note, 5/15/33 (144A) 100,257 2,380,232 1.84 AAA/Aaa Gracechurch Mortgage Financing Plc, Floating Rate Note, 11/20/56 (144A) 2,428,133 404,267 1.10 AAA/Aaa GS Mortgage Securities Corp II Trust 2007-EOP, Floating Rate Note, 3/6/20 (144A) 404,384 2,300,000 1.05 NR/Aaa GS Mortgage Securities Corp II, Floating Rate Note, 11/8/29 (144A) 2,305,226 The accompanying notes are an integral part of these financial statements. 38 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 900,000 NR/NR GS Mortgage Securities Corp Trust 2011-ALF, 3.563%, 2/10/21 (144A) $ 911,610 3,540,000 1.26 AAA/Aaa GS Mortgage Securities Corp. II, Floating Rate Note, 3/6/20 (144A) 3,545,508 500,000 2.20 AA/NR GS Mortgage Securities Corp. II, Floating Rate Note, 3/6/20 (144A) 502,205 140,765 2.54 B+/NR GSR Mortgage Loan Trust 2003-9, Floating Rate Note, 8/25/33 141,815 252,256 BB+/Ba1 GSR Mortgage Loan Trust 2005-6F, 5.0%, 7/25/35 253,122 341,810 1.33 AA+/Baa3 HarborView Mortgage Loan Trust 2004-4, Floating Rate Note, 6/19/34 337,462 1,435,333 1.70 AAA/Aaa Holmes Master Issuer Plc, Floating Rate Note, 10/15/54 (144A) 1,445,445 1,426,000 1.95 AAA/Aaa Holmes Master Issuer Plc, Floating Rate Note, 10/15/54 (144A) 1,454,377 2,500,000 1.85 AAA/Aaa Holmes Master Issuer Plc, Floating Rate Note, 10/21/54 (144A) 2,539,613 1,939,867 0.62 NR/Baa1 HomeBanc Mortgage Trust 2005-2, Floating Rate Note, 5/25/25 1,797,557 1,533,779 0.55 AA+/Aa3 Homestar Mortgage Acceptance Corp., Floating Rate Note, 6/25/34 1,519,153 1,388,503 0.65 AAA/Aa2 Homestar Mortgage Acceptance Corp., Floating Rate Note, 7/25/34 1,372,685 370,260 1.10 NR/Aaa Impac CMB Trust Series 2003-8, Floating Rate Note, 10/25/33 363,678 2,128,480 0.84 BBB/Ba3 Impac CMB Trust Series 2004-4, Floating Rate Note, 9/25/34 2,029,061 332,138 0.92 BBB/Baa2 Impac CMB Trust Series 2004-5, Floating Rate Note, 10/25/34 317,240 668,917 1.04 NR/Aaa Impac CMB Trust Series 2004-5, Floating Rate Note, 8/25/34 667,264 1,443,248 0.94 BBB+/A3 Impac CMB Trust Series 2004-7, Floating Rate Note, 11/25/34 1,385,247 686,915 0.61 AAA/Aaa Impac CMB Trust Series 2004-8, Floating Rate Note, 8/25/34 676,568 1,266,004 0.96 B/Ba2 Impac CMB Trust Series 2004-9, Floating Rate Note, 1/25/35 1,180,175 903,237 1.00 AAA/Aaa Impac Secured Assets CMN Owner Trust, Floating Rate Note, 11/25/34 880,640 698,229 0.55 AAA/Aaa Impac Secured Assets Trust 2006-1, Floating Rate Note, 5/25/36 689,171 200,292 0.55 AAA/Aaa Impac Secured Assets Trust 2006-2, Floating Rate Note, 8/25/36 194,074 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 39 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 257,000 6.45 NR/Caa1 JP Morgan Chase Commercial Mortgage Securities Corp. Pass-Through Certificates Series 2002 CIBC4, Floating Rate Note, 5/12/34 $ 261,181 1,723,644 4.92 AAA/Aaa JP Morgan Chase Commercial Mortgage Securities Corp. Pass-Through Certificates Series 2003-LN1, Floating Rate Note, 10/15/37 1,734,291 2,350,000 2.07 AA/Aa2 JP Morgan Chase Commercial Mortgage Securities Corp., Floating Rate Note, 10/15/25 (144A) 2,380,127 53,250 NR/Aaa JP Morgan Chase Commercial Mortgage Securities Trust 2006-CIBC15, 5.819%, 6/12/43 53,637 30,105 NR/Aaa JP Morgan Chase Commercial Mortgage Securities Trust 2006-CIBC17, 5.45%, 12/12/43 30,101 3,778,166 0.33 NR/Aa2 JP Morgan Chase Commercial Mortgage Securities Trust 2006-FL2, Floating Rate Note, 11/15/18 (144A) 3,721,017 801,351 0.41 NR/A2 JP Morgan Chase Commercial Mortgage Securities Trust 2006-FL2, Floating Rate Note, 11/15/18 (144A) 774,605 308,212 0.43 NR/A3 JP Morgan Chase Commercial Mortgage Securities Trust 2006-FL2, Floating Rate Note, 11/15/18 (144A) 291,761 192,633 0.56 NR/Ba1 JP Morgan Chase Commercial Mortgage Securities Trust 2006-FL2, Floating Rate Note, 11/15/18 (144A) 163,076 3,726,852 0.32 AAA/Aaa JP Morgan Chase Commercial Mortgage Securities Trust 2006-LDP9, Floating Rate Note, 5/15/47 3,714,896 200,000 0.36 AA/Aa3 JP Morgan Chase Commercial Mortgage Securities Trust 2006-LDP9, Floating Rate Note, 5/15/47 198,958 475,000 5.71 AAA/Aaa JP Morgan Chase Commercial Mortgage Securities Trust 2007-CIBC19, Floating Rate Note, 2/12/49 485,493 49,960 0.58 NR/Aa1 JP Morgan Chase Commercial Mortgage Securities Trust 2007-FL1, Floating Rate Note, 7/15/19 (144A) 48,823 34,790 NR/Aaa JP Morgan Chase Commercial Mortgage Securities Trust 2007-LDP10, 5.305%, 1/15/49 35,119 64,581 5.79 AAA/Aaa JP Morgan Chase Commercial Mortgage Securities Trust 2007-LDP11, Floating Rate Note, 6/15/49 66,553 The accompanying notes are an integral part of these financial statements. 40 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 481,744 2.10 AAA/Aaa JP Morgan Chase Commercial Mortgage Securities Trust 2011-FL1, Floating Rate Note, 11/15/28 (144A) $ 485,229 750,174 2.20 BBB/Baa1 JP Morgan Mortgage Trust 2003-A1, Floating Rate Note, 10/25/33 762,685 265,662 2.96 A+/NR JP Morgan Mortgage Trust 2005-A3, Floating Rate Note, 6/25/35 264,499 324,960 2.58 BBB+/Ba1 JP Morgan Mortgage Trust 2005-A4, Floating Rate Note, 7/25/35 326,516 2,000,000 1.69 AAA/Aaa Lanark Master Issuer Plc, Floating Rate Note, 12/22/54 (144A) 2,040,799 244,375 5.12 AAA/Aaa LB-UBS Commercial Mortgage Trust 2003-C8, Floating Rate Note, 11/15/32 246,926 887,089 AAA/Aaa LB-UBS Commercial Mortgage Trust 2004-C1, 4.568%, 1/15/31 909,409 641,236 AAA/Aaa LB-UBS Commercial Mortgage Trust 2004-C2, 3.973%, 3/15/29 646,366 2,080,000 AAA/Aaa LB-UBS Commercial Mortgage Trust 2004-C2, 4.367%, 3/15/36 2,135,051 327,306 AAA/Aaa LB-UBS Commercial Mortgage Trust 2005-C3, 4.664%, 7/15/30 332,685 38,257 AAA/Aaa LB-UBS Commercial Mortgage Trust 2007-C6, 5.845%, 7/15/40 38,382 336,472 6.15 AAA/Aaa LB-UBS Commercial Mortgage Trust 2008-C1, Floating Rate Note, 4/15/41 357,049 2,081,398 0.32 AAA/Aaa Lehman Brothers Floating Rate Commercial Mortgage Trust 2006-LLF C5, Floating Rate Note, 9/15/21 (144A) 2,078,238 1,281,412 0.90 BB/Aaa Lehman Brothers Floating Rate Commercial Mortgage Trust 2007-LLF C5, Floating Rate Note, 6/15/22 (144A) 1,275,677 725,000 1.10 B+/A1 Lehman Brothers Floating Rate Commercial Mortgage Trust 2007-LLF C5, Floating Rate Note, 6/15/22 (144A) 703,630 66,661 1.05 AAA/Aaa Lehman Brothers Small Balance Commercial Mortgage Trust 2007-3 Class 1A2, Floating Rate Note, 10/25/37 (144A) 66,422 152,887 1.15 A+/Aa1 Lehman Brothers Small Balance Commercial Mortgage Trust 2007-3 Class 1A4, Floating Rate Note, 10/25/37 (144A) 152,114 1,165,480 0.43 A+/Aa2 Lehman Brothers Small Balance Commercial, Floating Rate Note, 4/25/31 (144A) 1,004,832 2,366,886 0.45 A+/Aa3 Lehman Brothers Small Balance Commercial, Floating Rate Note, 9/25/30 (144A) 2,065,437 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 41 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 973,582 2.29 A+/Baa2 MASTR Adjustable Rate Mortgages Trust 2003-3, Floating Rate Note, 9/25/33 $ 958,046 1,000,000 1.30 A+/B1 MASTR Adjustable Rate Mortgages Trust 2004-11, Floating Rate Note, 11/25/34 886,915 1,666,789 0.36 AA-/A2 MASTR Adjustable Rate Mortgages Trust 2007-1, Floating Rate Note, 1/25/47 1,660,901 14,697 AAA/NR MASTR Asset Securitization Trust 2003-6, 4.5%, 7/25/13 14,675 475,105 0.60 AA+/NR MASTR Asset Securitization Trust 2003-6, Floating Rate Note, 7/25/18 469,696 1,592 AAA/NR MASTR Asset Securitization Trust 2004-3, 4.75%, 1/25/14 1,599 2,705,495 1.28 BBB+/Baa3 Merrill Lynch Mortgage Investors Trust Series MLCC 2003-A, Floating Rate Note, 3/25/28 2,665,692 473,479 0.86 AA+/Aa3 Merrill Lynch Mortgage Investors Trust Series MLCC 2003-C, Floating Rate Note, 6/25/28 468,963 959,523 2.40 A+/Baa3 Merrill Lynch Mortgage Investors Trust Series MLCC 2003-G, Floating Rate Note, 1/25/29 948,554 279,167 0.66 A+/A3 Merrill Lynch Mortgage Investors Trust Series MLCC 2004-A, Floating Rate Note, 4/25/29 272,652 686,062 1.07 AA+/Baa3 Merrill Lynch Mortgage Investors Trust Series MLCC 2004-B, Floating Rate Note, 5/25/29 652,247 241,000 1.51 AA+/A3 Merrill Lynch Mortgage Investors Trust Series MLCC 2004-C, Floating Rate Note, 7/25/29 238,933 875,249 2.27 AA+/Baa2 Merrill Lynch Mortgage Investors Trust Series MLCC 2004-D, Floating Rate Note, 9/25/29 864,630 3,997,024 0.53 A+/Ba2 Merrill Lynch Mortgage Investors Trust Series MLCC 2004-E, Floating Rate Note, 11/25/29 3,822,730 1,298,936 1.11 A+/Baa2 Merrill Lynch Mortgage Investors Trust Series MLCC 2004-G, Floating Rate Note, 1/25/30 1,257,562 663,756 2.44 BBB/B3 Merrill Lynch Mortgage Investors Trust Series MLCC 2005-2, Floating Rate Note, 10/25/35 656,694 439,579 0.66 AA+/Baa2 Merrill Lynch Mortgage Investors Trust Series MLCC 2005-A, Floating Rate Note, 3/25/30 438,275 The accompanying notes are an integral part of these financial statements. 42 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 400,649 5.24 AAA/NR Merrill Lynch Mortgage Trust Class A4, Floating Rate Note, 11/12/35 $ 406,544 497,614 5.29 NR/Aaa ML-CFC Commercial Mortgage Trust 2006-3, Floating Rate Note, 7/12/46 503,484 3,319,686 0.47 AA+/Baa3 Morgan Stanley Mortgage Loan Trust 2005-5AR, Floating Rate Note, 9/25/35 3,188,874 1,345,821 0.48 A+/Ba2 Morgan Stanley Mortgage Loan Trust 2005-6AR, Floating Rate Note, 11/25/35 1,265,353 1,174,277 0.50 A/NR Morgan Stanley Re-REMIC Trust 2010-R4, Floating Rate Note, 7/26/36 (144A) 1,166,114 1,727,275 0.98 AA+/Baa1 MortgageIT Trust 2004-1, Floating Rate Note, 11/25/34 1,667,989 1,747,312 0.46 A+/Baa2 MortgageIT Trust 2005-2, Floating Rate Note, 5/25/35 1,642,581 1,262,244 0.65 AA+/Aaa NCUA Guaranteed Notes Trust 2010-R1, Floating Rate Note, 10/7/20 1,266,194 3,703,819 0.57 AA+/Aaa NCUA Guaranteed Notes Trust 2010-R2, Floating Rate Note, 11/6/17 3,718,857 1,092,216 0.76 NR/Aaa NCUA Guaranteed Notes Trust 2010-R3, Floating Rate Note, 12/8/20 1,098,704 334,075 0.76 NR/Aaa NCUA Guaranteed Notes Trust 2010-R3, Floating Rate Note, 12/8/20 335,411 1,822,104 0.73 NR/Aaa NCUA Guaranteed Notes Trust 2011-C1, Floating Rate Note, 3/9/21 1,826,971 1,411,382 0.60 AA+/Aaa NCUA Guaranteed Notes Trust 2011-R3, Floating Rate Note, 3/11/20 1,415,792 557,725 0.58 AA+/NR NCUA Guaranteed Notes Trust 2011-R5, Floating Rate Note, 4/6/20 558,946 2,835,988 1.40 AAA/Aaa NorthStar 2012-1 Mortgage Trust, Floating Rate Note, 8/25/29 (144A) 2,835,988 1,000,000 4.45 BBB/Baa3 NorthStar 2012-1 Mortgage Trust, Floating Rate Note, 8/25/29 (144A) 1,016,717 650,535 0.45 BB+/B2 Opteum Mortgage Acceptance Corp Asset Backed Pass-Through Certificates 2005-5, Floating Rate Note, 12/25/35 635,643 771,073 0.46 AA+/A3 Opteum Mortgage Acceptance Corp Asset Backed Pass-Through Certificates Series 20, Floating Rate Note, 7/25/35 766,817 1,500,762 1.60 B-/Ba1 RESI Finance LP, Floating Rate Note, 9/10/35 (144A) 1,321,481 162,989 0.60 BBB+/NR Residential Asset Securitization Trust 2003-A2, Floating Rate Note, 5/25/33 147,379 47,767 0.70 AA+/NR Residential Asset Securitization Trust 2003-A6, Floating Rate Note, 7/25/33 47,681 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 43 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 2,100,000 0.00 NR/NR Resimac MBS Trust, Floating Rate Note, 3/7/14 $ 2,100,000 1,377,547 2.68 BBB+/B2 SASCO Mortgage Pass-Through Certificates Series 2004-S4, Floating Rate Note, 12/25/34 1,400,594 246,108 0.96 AA+/A3 Sequoia Mortgage Trust 10, Floating Rate Note, 10/20/27 242,579 718,254 1.25 AA+/Baa3 Sequoia Mortgage Trust 2003-2, Floating Rate Note, 6/20/33 716,742 301,986 0.82 AA+/Baa3 Sequoia Mortgage Trust 2003-5, Floating Rate Note, 9/20/33 298,079 652,771 0.84 A+/Baa1 Sequoia Mortgage Trust 2003-8, Floating Rate Note, 1/20/34 613,751 496,438 0.52 A+/Baa3 Sequoia Mortgage Trust 2004-10, Floating Rate Note, 11/20/34 488,075 1,164,116 0.47 A/Baa1 Sequoia Mortgage Trust 2004-12, Floating Rate Note, 1/20/35 1,085,549 162,339 0.80 AA/A3 Sequoia Mortgage Trust 2004-12, Floating Rate Note, 1/20/35 153,430 289,286 1.87 AA+/Baa3 Sequoia Mortgage Trust 2004-7, Floating Rate Note, 8/20/34 289,087 1,219,225 0.43 AA+/B1 Sequoia Mortgage Trust 2005-1, Floating Rate Note, 2/20/35 1,170,472 497,537 0.42 BBB+/Ba3 Sequoia Mortgage Trust 2005-2, Floating Rate Note, 3/20/35 463,022 292,501 0.92 AA+/A2 Sequoia Mortgage Trust 4, Floating Rate Note, 11/22/24 289,995 76,203 0.34 AAA/Aaa Series 2007-1G WST Trust, Floating Rate Note, 5/21/38 (144A) 75,656 421,202 NR/Baa3 SMA Issuer I LLC, 3.5%, 8/20/25 (144A) 423,026 178,367 0.40 AAA/Aaa SMHL Global Fund 2007-1, Floating Rate Note, 6/12/40 177,266 902,769 1.57 AAA/NR Springleaf Mortgage Loan Trust 2012-3, Floating Rate Note, 12/25/59 (144A) 905,590 1,012,294 0.90 AA+/A3 Structured Asset Mortgage Investments II Trust 2004-AR1, Floating Rate Note, 3/19/34 985,241 716,143 1.14 AA/NR Structured Asset Securities Corp. Mortgage Pass-Through Certificates Series 1998-8, Floating Rate Note, 8/25/28 706,403 465,998 2.77 AA+/Baa1 Structured Asset Securities Corp. Mortgage Pass-Through Certificates Series 2003-22A, Floating Rate Note, 6/25/33 468,170 1,272,013 2.60 A+/Baa3 Structured Asset Securities Corp. Mortgage Pass-Through Certificates Series 2003-24A, Floating Rate Note, 7/25/33 1,247,194 The accompanying notes are an integral part of these financial statements. 44 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 377,260 2.77 A+/Baa3 Structured Asset Securities Corp. Mortgage Pass-Through Certificates Series 2003-31A, Floating Rate Note, 10/25/33 $ 384,039 267,074 0.70 A+/Baa3 Structured Asset Securities Corp. Mortgage Pass-Through Certificates Series 2003-35, Floating Rate Note, 12/25/33 259,286 640,064 0.85 NR/NR Structured Asset Securities Corp. Reverse Mortgage Loan Trust 2002-RM1, Floating Rate Note, 10/25/37 (144A) 633,663 458,883 0.50 BB+/Ba3 Structured Asset Securities Corp. Trust 2005-14, Floating Rate Note, 7/25/35 411,172 393,354 1.82 AA+/Ba1 Thornburg Mortgage Securities Trust Class II2A, Floating Rate Note, 3/25/44 391,588 1,677,561 0.78 BB+/Aaa UBS Commercial Mortgage Trust 2007-FL1, Floating Rate Note, 7/15/24 (144A) 1,661,811 80,815 AAA/Aaa Wachovia Bank Commercial Mortgage Trust Series 2005-C18, 4.79%, 4/15/42 81,047 51,464 5.09 AAA/Aaa Wachovia Bank Commercial Mortgage Trust Series 2005-C20, Floating Rate Note, 7/15/42 52,036 2,397,855 0.28 A+/Aaa Wachovia Bank Commercial Mortgage Trust Series 2007-WHALE 8, Floating Rate Note, 6/15/20 (144A) 2,363,723 255,856 2.49 A+/A3 WaMu Mortgage Pass-Through Certificates, Floating Rate Note, 1/25/33 260,497 424,077 2.44 BBB+/NR WaMu Mortgage Pass-Through Certificates, Floating Rate Note, 1/25/35 424,748 1,463,147 2.49 B/NR WaMu Mortgage Pass-Through Certificates, Floating Rate Note, 12/25/35 1,419,305 582,081 2.48 A+/Ba2 WaMu Mortgage Pass-Through Certificates, Floating Rate Note, 2/25/33 582,309 187,448 0.60 NR/A2 WaMu Mortgage Pass-Through Certificates, Floating Rate Note, 3/25/34 184,942 182,821 BBB+/NR Wells Fargo Mortgage Backed Securities 2003-19 Trust, 4.5%, 1/25/19 182,866 82,068 5.00 NR/Ba2 Wells Fargo Mortgage Backed Securities 2005-AR6 Trust, Floating Rate Note, 4/25/35 83,658 1,818,360 4.94 BBB+/Ba3 Wells Fargo Mortgage Backed Securities Trust, Floating Rate Note, 8/25/34 1,871,054 -------------- $ 200,224,858 -------------- Total Banks $ 200,224,858 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 45 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 4.4% Other Diversified Financial Services -- 3.4% 63,993 1.49 NR/Aaa Arran Residential Mortgages Funding Plc, Floating Rate Note, 11/19/47 (144A) $ 64,063 702,312 0.94 AA+/Baa1 Bear Stearns ALT-A Trust 2004-13, Floating Rate Note, 11/25/34 692,017 1,328,801 0.90 A+/Baa2 Bear Stearns ALT-A Trust 2004-8, Floating Rate Note, 9/25/34 1,300,419 184,085 0.70 AAA/Baa2 Bear Stearns ALT-A Trust 2005-2, Floating Rate Note, 3/25/35 177,366 506,783 3.13 BBB+/B3 Bear Stearns ARM Trust 2004-3, Floating Rate Note, 7/25/34 491,961 157,256 0.53 AA+/Ba1 Chevy Chase Funding LLC Mortgage-Backed Certificates Series 2004-1, Floating Rate Note, 1/25/35 (144A) 134,214 78,661 0.50 A+/Ba2 Chevy Chase Funding LLC Mortgage-Backed Certificates Series 2004-3, Floating Rate Note, 8/25/35 (144A) 67,421 38,558 NR/Ba2 Citicorp Mortgage Securities REMIC Pass-Through Certificates Trust Series 2005-4, 5.0%, 7/25/20 40,483 186,599 NR/B2 Citicorp Mortgage Securities Trust Series 2006-3, 6.25%, 6/25/36 187,115 105,117 NR/A2 Citicorp Mortgage Securities, Inc., 4.75%, 1/25/34 106,677 233,086 5.76 AAA/Aaa Commercial Mortgage Pass-Through Certificates Series 2007-C4, Floating Rate Note, 9/15/39 237,602 1,186,545 0.32 BBB+/Aaa Commercial Mortgage Pass-Through Certificates Series 2007-TFL1, Floating Rate Note, 2/15/22 (144A) 1,174,890 81,881 AAA/Aaa Commercial Mortgage Trust 2003-C1, 4.111%, 7/5/35 81,864 2,956,723 0.37 AAA/Aa2 Credit Suisse Mortgage Capital Certificates, Floating Rate Note, 10/15/21 (144A) 2,899,233 2,295,748 0.35 AAA/Aaa Crusade Global Trust, Floating Rate Note, 11/15/37 2,240,343 2,524,143 0.36 AAA/Aaa Crusade Global Trust, Floating Rate Note, 4/19/38 2,465,351 858,902 0.35 AAA/Aaa Crusade Global Trust, Floating Rate Note, 8/14/37 847,557 1,460,000 1.50 NR/NR Del Coronado Trust, Floating Rate Note, 3/15/26 (144A) 1,460,000 960,016 0.55 NR/NR Fannie Mae Trust 2003-W6, Floating Rate Note, 9/25/42 945,850 1,841,918 0.38 A/Aa3 GE Business Loan Trust 2006-2, Floating Rate Note, 11/15/34 (144A) 1,700,682 The accompanying notes are an integral part of these financial statements. 46 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Other Diversified Financial Services -- (continued) 976,677 0.40 BB+/Baa2 Impac Secured Assets Trust 2006-5, Floating Rate Note, 12/25/36 $ 894,675 51,343 5.95 A+/Caa1 JP Morgan Alternative Loan Trust, Floating Rate Note, 9/25/36 51,347 1,020,104 0.33 AAA/Aaa Medallion Trust Series 2007-1G, Floating Rate Note, 2/27/39 1,015,443 238,862 2.53 A+/NR Merrill Lynch Mortgage Investors Trust Series MLMI 2005-A2, Floating Rate Note, 2/25/35 240,222 2,050,007 AAA/NR Morgan Stanley Capital I Trust 2004-HQ4, 4.97%, 4/14/40 2,135,359 1,850,187 5.11 AAA/NR Morgan Stanley Capital I Trust 2004-IQ8, Floating Rate Note, 6/15/40 1,920,690 2,158,285 NR/Aaa Morgan Stanley Capital I Trust 2004-TOP13, 4.66%, 9/13/45 2,191,488 118,820 AAA/NR Morgan Stanley Capital I Trust 2005-HQ6, 4.882%, 8/13/42 118,766 100,000 0.80 A+/A1 Morgan Stanley Capital I, Inc. Class B, Floating Rate Note, 12/15/20 (144A) 98,158 100,000 0.90 BBB+/A3 Morgan Stanley Capital I, Inc. Class C, Floating Rate Note, 12/15/20 (144A) 97,568 908,644 0.30 AA+/Aaa Morgan Stanley Capital I, Inc., Floating Rate Note, 10/15/20 (144A) 900,102 1,750,000 0.33 A+/Aa1 Morgan Stanley Capital I, Inc., Floating Rate Note, 10/15/20 (144A) 1,700,310 2,263,061 0.76 AA+/Aa2 Morgan Stanley Capital I, Inc., Floating Rate Note, 12/15/20 (144A) 2,210,049 2,292,755 NR/Baa3 ORES NPL LLC, 4.0%, 9/25/44 (144A) 2,294,651 201,594 0.75 NR/Baa3 RALI Series 2002-QS16 Trust, Floating Rate Note, 10/25/17 190,799 174,799 0.70 BB+/Ba1 RALI Series 2003-QS11 Trust, Floating Rate Note, 6/25/33 164,252 1,192,537 0.65 BBB/NR RALI Series 2003-QS22 Trust, Floating Rate Note, 12/26/33 1,088,492 2,098,144 0.65 AA+/NR RALI Series 2003-QS5 Trust, Floating Rate Note, 3/25/18 2,041,975 252,199 BBB+/Ba1 RALI Series 2004-QS1 Trust, 4.25%, 1/25/34 255,051 252,877 0.75 BBB+/Ba1 RALI Series 2004-QS1 Trust, Floating Rate Note, 1/25/34 243,715 83,702 NR/B3 RALI Series 2004-QS16 Trust, 5.5%, 12/25/34 82,472 509,070 BB+/Ba3 RALI Series 2004-QS5 Trust, 4.75%, 4/25/34 528,754 414,681 0.80 BB+/Ba3 RALI Series 2004-QS5 Trust, Floating Rate Note, 4/25/34 397,474 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 47 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Other Diversified Financial Services -- (continued) 684,478 3.00 BB+/Ba2 Structured Adjustable Rate Mortgage Loan Trust Class 1A1, Floating Rate Note, 3/25/34 $ 668,585 558,030 2.51 A+/A3 Structured Adjustable Rate Mortgage Loan Trust, Floating Rate Note, 3/25/34 554,641 106,763 0.60 AAA/A3 Structured Adjustable Rate Mortgage Loan Trust, Floating Rate Note, 6/25/35 106,323 2,937,319 NR/NR Vericrest Opportunity Loan Transferee, 2.487%, 2/26/52 (144A) 2,945,837 1,343,000 2.73 NR/NR Vericrest Opportunity Loan Transferee, Floating Rate Note, 11/25/60 (144A) 1,343,725 -------------- $ 43,796,031 ---------------------------------------------------------------------------------------------------------- Specialized Finance -- 0.5% 1,173,171 1.70 AAA/Aaa Fosse Master Issuer Plc, Floating Rate Note, 10/18/54 (144A) $ 1,187,425 1,000,000 1.70 AAA/Aaa Fosse Master Issuer Plc, Floating Rate Note, 10/18/54 (144A) 1,020,010 251,277 2.66 AAA/Aaa Nomura Asset Acceptance Corp Alternative Loan Trust Series 2004-AR4, Floating Rate Note, 12/25/34 253,032 164,317 BBB/B2 Nomura Asset Acceptance Corp Alternative Loan Trust Series 2005-WF1, 4.786%, 3/25/35 165,862 500,000 1.70 AAA/Aaa Permanent Master Issuer Plc, Floating Rate Note, 7/15/42 (144A) 504,340 2,500,000 1.80 AAA/Aaa Permanent Master Issuer Plc, Floating Rate Note, 7/15/42 (144A) 2,511,914 631,000 1.90 AAA/Aaa Permanent Master Issuer Plc, Floating Rate Note, 7/15/42 (144A) 646,437 -------------- $ 6,289,020 ---------------------------------------------------------------------------------------------------------- Consumer Finance -- 0.2% 1,150,511 0.45 NR/NR Freddie Mac Strips, Floating Rate Note, 8/15/36 $ 1,148,228 1,748,777 0.50 NR/NR Freddie Mac Strips, Floating Rate Note, 8/15/36 1,747,863 260,482 3.56 BBB+/Baa3 GMACM Mortgage Loan Trust 2005-AR3, Floating Rate Note, 6/19/35 261,253 -------------- $ 3,157,344 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 48 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Asset Management & Custody Banks -- 0.1% 443,927 NR/NR Freddie Mac Reference REMIC, 5.5%, 12/15/20 $ 446,145 532,479 0.60 NR/NR Freddie Mac Reference REMIC, Floating Rate Note, 7/15/23 532,685 -------------- $ 978,830 ---------------------------------------------------------------------------------------------------------- Investment Banking & Brokerage -- 0.2% 47,258 AAA/NR Banc of America Merrill Lynch Commercial Mortgage, Inc., 4.512%, 12/10/42 $ 47,644 2,363,776 5.06 AAA/NR Banc of America Merrill Lynch Commercial Mortgage, Inc., Floating Rate Note, 3/11/41 2,379,247 558,847 AAA/NR Bear Stearns Commercial Mortgage Securities Trust 2004-PWR3, 4.715%, 2/11/41 568,693 26,979 7.32 BB-/NR Morgan Stanley Dean Witter Cap I Inc Dep For Ser 2001-top1, Floating Rate Note, 2/15/33 (144A) 26,985 -------------- $ 3,022,569 -------------- Total Diversified Financials $ 57,243,794 ---------------------------------------------------------------------------------------------------------- REAL ESTATE -- 0.5% Mortgage REITs -- 0.2% 1,393,701 4.90 AAA/NR Credit Suisse First Boston Mortgage Securities Corp., Floating Rate Note, 12/15/36 $ 1,408,038 59,187 1.55 AA+/A3 Credit Suisse First Boston Mortgage Securities Corp., Floating Rate Note, 12/25/33 57,929 352,836 0.94 AAA/Baa1 Credit Suisse First Boston Mortgage Securities Corp., Floating Rate Note, 6/25/34 346,649 393,189 5.14 AAA/Aaa Credit Suisse First Boston Mortgage Securities Corp., Floating Rate Note, 8/15/36 395,042 -------------- $ 2,207,658 ---------------------------------------------------------------------------------------------------------- Diversified Real Estate Activities -- 0.3% 875,824 0.68 BBB/Aaa Mellon Residential Funding Corp. Mortgage Pass-Through Trust Series 2000 TBC2, Floating Rate Note, 6/15/30 $ 865,836 985,777 0.64 B+/Aaa Mellon Residential Funding Corp. Mortgage Pass-Through Trust Series 2000-TBC3, Floating Rate Note, 12/15/30 954,340 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 49 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Diversified Real Estate Activities -- (continued) 3,000,000 2.83 NR/NR Resource Real Estate Partners LLC, Floating Rate Note, 12/20/15 (144A) $ 3,000,000 -------------- $ 4,820,176 -------------- Total Real Estate $ 7,027,834 ---------------------------------------------------------------------------------------------------------- GOVERNMENT -- 11.1% Government -- 11.1% 1,503,692 NR/Aaa DBRR 2012- EZ1 Trust, 0.946%, 9/25/45 (144A) $ 1,507,737 1,016,580 0.53 NR/NR Fannie Mae REMIC Trust 2007-W3, Floating Rate Note, 4/25/37 1,019,203 414,050 NR/NR Fannie Mae REMICs, 3.0%, 4/25/40 430,242 210,239 NR/NR Fannie Mae REMICs, 3.5%, 10/25/39 218,167 17,943 NR/NR Fannie Mae REMICs, 3.5%, 12/25/31 18,125 234,313 NR/NR Fannie Mae REMICs, 3.5%, 9/25/18 234,359 97,442 NR/NR Fannie Mae REMICs, 4.0%, 11/25/35 97,454 2,000,000 NR/NR Fannie Mae REMICs, 4.0%, 5/25/29 2,081,248 1,081,152 NR/NR Fannie Mae REMICs, 4.0%, 6/25/37 1,093,841 223,984 NR/NR Fannie Mae REMICs, 4.0%, 9/25/21 225,187 919,614 NR/NR Fannie Mae REMICs, 4.5%, 1/25/38 935,126 208,812 NR/NR Fannie Mae REMICs, 4.5%, 1/25/39 215,311 25,536 NR/NR Fannie Mae REMICs, 4.5%, 2/25/33 25,698 19,844 NR/NR Fannie Mae REMICs, 5.0%, 8/25/35 19,984 285,625 NR/NR Fannie Mae REMICs, 5.5%, 10/25/32 287,318 95,054 NR/NR Fannie Mae REMICs, 6.0%, 3/25/27 97,749 313,214 NR/NR Fannie Mae REMICs, 6.0%, 3/25/35 329,798 185,819 NR/NR Fannie Mae REMICs, 6.0%, 4/25/39 188,674 15,871 NR/NR Fannie Mae REMICs, 7.0%, 6/25/13 15,931 680,684 0.90 NR/NR Fannie Mae REMICs, Floating Rate Note, 1/25/32 688,675 688,719 0.75 NR/NR Fannie Mae REMICs, Floating Rate Note, 1/25/40 695,888 80,461 0.50 NR/NR Fannie Mae REMICs, Floating Rate Note, 10/25/35 80,439 2,984,721 0.60 NR/NR Fannie Mae REMICs, Floating Rate Note, 10/25/36 3,006,196 252,708 0.75 NR/NR Fannie Mae REMICs, Floating Rate Note, 10/25/37 254,871 968,642 0.80 NR/NR Fannie Mae REMICs, Floating Rate Note, 10/25/37 981,071 2,382,000 0.40 NR/NR Fannie Mae REMICs, Floating Rate Note, 10/27/37 2,383,553 785,610 0.80 NR/NR Fannie Mae REMICs, Floating Rate Note, 11/25/31 792,532 The accompanying notes are an integral part of these financial statements. 50 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Government -- (continued) 691,336 0.80 NR/NR Fannie Mae REMICs, Floating Rate Note, 11/25/31 $ 693,436 1,429,021 0.70 NR/NR Fannie Mae REMICs, Floating Rate Note, 11/25/33 1,434,943 152,260 0.50 NR/NR Fannie Mae REMICs, Floating Rate Note, 11/25/34 152,559 584,995 0.52 NR/NR Fannie Mae REMICs, Floating Rate Note, 11/25/36 587,185 156,834 0.82 NR/NR Fannie Mae REMICs, Floating Rate Note, 12/25/23 158,023 548,737 1.22 NR/NR Fannie Mae REMICs, Floating Rate Note, 12/25/23 558,475 133,585 0.75 NR/NR Fannie Mae REMICs, Floating Rate Note, 12/25/30 134,616 699,008 1.10 NR/NR Fannie Mae REMICs, Floating Rate Note, 12/25/31 711,624 538,638 0.70 NR/NR Fannie Mae REMICs, Floating Rate Note, 12/25/32 542,693 676,030 0.50 NR/NR Fannie Mae REMICs, Floating Rate Note, 12/25/35 677,797 478,668 0.44 NR/NR Fannie Mae REMICs, Floating Rate Note, 12/25/36 478,465 349,482 0.60 NR/NR Fannie Mae REMICs, Floating Rate Note, 12/25/38 349,305 4,727,647 0.50 NR/NR Fannie Mae REMICs, Floating Rate Note, 12/25/42 4,733,604 594,468 0.75 NR/NR Fannie Mae REMICs, Floating Rate Note, 12/25/49 598,429 35,818 0.67 AAA/NR Fannie Mae REMICs, Floating Rate Note, 2/25/17 35,889 223,421 0.95 NR/NR Fannie Mae REMICs, Floating Rate Note, 2/25/33 226,047 538,423 0.51 NR/NR Fannie Mae REMICs, Floating Rate Note, 2/25/35 539,618 2,256,659 0.45 NR/NR Fannie Mae REMICs, Floating Rate Note, 2/25/37 2,254,669 1,092,957 0.40 NR/NR Fannie Mae REMICs, Floating Rate Note, 2/25/37 1,089,291 662,605 0.90 NR/NR Fannie Mae REMICs, Floating Rate Note, 2/25/38 667,334 302,411 0.70 NR/NR Fannie Mae REMICs, Floating Rate Note, 3/25/23 303,153 473,408 0.50 NR/NR Fannie Mae REMICs, Floating Rate Note, 3/25/28 463,028 349,647 0.50 NR/NR Fannie Mae REMICs, Floating Rate Note, 3/25/35 349,959 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 51 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Government -- (continued) 167,364 0.50 NR/NR Fannie Mae REMICs, Floating Rate Note, 3/25/36 $ 167,802 328,771 0.50 NR/NR Fannie Mae REMICs, Floating Rate Note, 3/25/36 329,823 484,902 1.20 NR/NR Fannie Mae REMICs, Floating Rate Note, 3/25/37 493,940 185,610 0.50 NR/NR Fannie Mae REMICs, Floating Rate Note, 4/25/25 186,462 231,458 0.85 NR/NR Fannie Mae REMICs, Floating Rate Note, 4/25/30 233,294 459,339 0.70 NR/NR Fannie Mae REMICs, Floating Rate Note, 4/25/33 462,455 344,768 0.43 NR/NR Fannie Mae REMICs, Floating Rate Note, 4/25/37 344,221 573,826 0.70 NR/NR Fannie Mae REMICs, Floating Rate Note, 4/25/42 581,077 2,648,112 0.51 NR/NR Fannie Mae REMICs, Floating Rate Note, 5/25/36 2,648,660 386,580 0.80 NR/NR Fannie Mae REMICs, Floating Rate Note, 5/25/40 390,523 3,208,184 0.70 NR/NR Fannie Mae REMICs, Floating Rate Note, 5/25/40 3,226,391 1,923,934 0.75 NR/NR Fannie Mae REMICs, Floating Rate Note, 5/25/40 1,935,712 188,165 0.60 NR/NR Fannie Mae REMICs, Floating Rate Note, 6/25/23 188,658 3,341,424 0.40 NR/NR Fannie Mae REMICs, Floating Rate Note, 6/25/37 3,335,163 1,296,910 0.44 NR/NR Fannie Mae REMICs, Floating Rate Note, 6/25/37 1,294,635 134,432 0.43 NR/NR Fannie Mae REMICs, Floating Rate Note, 6/25/37 134,395 203,571 0.65 NR/NR Fannie Mae REMICs, Floating Rate Note, 6/25/37 204,934 51,836 0.72 NR/NR Fannie Mae REMICs, Floating Rate Note, 7/18/27 52,012 760,326 0.80 NR/NR Fannie Mae REMICs, Floating Rate Note, 7/25/31 767,582 503,852 0.80 NR/NR Fannie Mae REMICs, Floating Rate Note, 7/25/31 509,287 322,789 1.20 NR/NR Fannie Mae REMICs, Floating Rate Note, 7/25/32 330,261 211,371 0.65 NR/NR Fannie Mae REMICs, Floating Rate Note, 7/25/34 212,614 2,749,765 0.50 NR/NR Fannie Mae REMICs, Floating Rate Note, 7/25/35 2,751,304 The accompanying notes are an integral part of these financial statements. 52 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Government -- (continued) 587,821 0.45 NR/NR Fannie Mae REMICs, Floating Rate Note, 7/25/35 $ 589,232 451,313 0.49 NR/NR Fannie Mae REMICs, Floating Rate Note, 7/25/36 451,912 1,049,062 0.68 NR/NR Fannie Mae REMICs, Floating Rate Note, 7/25/36 1,050,692 460,993 0.60 NR/NR Fannie Mae REMICs, Floating Rate Note, 7/25/37 464,069 334,105 0.70 NR/NR Fannie Mae REMICs, Floating Rate Note, 8/25/31 336,794 157,362 0.80 NR/NR Fannie Mae REMICs, Floating Rate Note, 8/25/32 158,872 44,677 0.60 NR/NR Fannie Mae REMICs, Floating Rate Note, 8/25/33 44,758 475,250 0.75 NR/NR Fannie Mae REMICs, Floating Rate Note, 8/25/36 476,403 69,593 1.02 AA+/NR Fannie Mae REMICs, Floating Rate Note, 9/25/20 70,086 128,329 1.12 NR/NR Fannie Mae REMICs, Floating Rate Note, 9/25/21 129,887 645,997 0.70 NR/NR Fannie Mae REMICs, Floating Rate Note, 9/25/32 651,154 815,911 0.65 NR/NR Fannie Mae REMICs, Floating Rate Note, 9/25/32 817,308 961,929 0.45 NR/NR Fannie Mae REMICs, Floating Rate Note, 9/25/36 961,739 2,150,168 0.70 NR/NR Fannie Mae REMICs, Floating Rate Note, 9/25/37 2,169,840 470,046 0.75 NR/NR Fannie Mae REMICs, Floating Rate Note, 9/25/37 474,507 147,728 0.95 NR/NR Fannie Mae REMICs, Floating Rate Note, 9/25/38 148,113 172,122 2.75 NR/NR Fannie Mae Trust 2005-W3, Floating Rate Note, 4/25/45 183,782 280,343 2.29 NR/NR Fannie Mae Trust 2005-W4, Floating Rate Note, 6/25/35 291,465 57,735 NR/NR Freddie Mac REMICs, 3.5%, 11/15/22 59,181 1,889,486 NR/NR Freddie Mac REMICs, 3.5%, 6/15/28 1,953,556 328,385 NR/NR Freddie Mac REMICs, 4.0%, 1/15/24 336,350 82,121 NR/NR Freddie Mac REMICs, 4.0%, 11/15/23 84,534 655,321 NR/NR Freddie Mac REMICs, 4.0%, 12/15/22 668,811 161,023 NR/NR Freddie Mac REMICs, 5.0%, 10/15/31 162,142 177,101 NR/NR Freddie Mac REMICs, 5.0%, 12/15/32 180,915 83,340 NR/NR Freddie Mac REMICs, 5.0%, 6/15/22 83,531 1,016,131 NR/NR Freddie Mac REMICs, 5.0%, 6/15/34 1,050,436 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 53 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Government -- (continued) 140,083 NR/NR Freddie Mac REMICs, 5.0%, 7/15/32 $ 142,735 317,487 NR/NR Freddie Mac REMICs, 5.0%, 8/15/32 321,644 72,724 NR/NR Freddie Mac REMICs, 5.5%, 10/15/22 72,799 50,363 NR/NR Freddie Mac REMICs, 5.5%, 3/15/32 51,019 307,571 NR/NR Freddie Mac REMICs, 5.5%, 3/15/33 310,964 21,845 NR/NR Freddie Mac REMICs, 5.5%, 5/15/32 21,926 143,693 NR/NR Freddie Mac REMICs, 5.5%, 5/15/33 147,158 160,784 NR/NR Freddie Mac REMICs, 6.0%, 4/15/36 160,791 915,674 0.60 NR/NR Freddie Mac REMICs, Floating Rate Note, 1/15/33 919,376 594,504 0.50 NR/NR Freddie Mac REMICs, Floating Rate Note, 1/15/36 596,050 2,335,393 0.50 NR/NR Freddie Mac REMICs, Floating Rate Note, 1/15/37 2,339,667 276,104 0.35 NR/NR Freddie Mac REMICs, Floating Rate Note, 10/15/20 275,962 184,936 1.15 AAA/NR Freddie Mac REMICs, Floating Rate Note, 10/15/31 188,816 1,622,959 0.82 NR/NR Freddie Mac REMICs, Floating Rate Note, 10/15/37 1,636,350 510,936 0.50 NR/NR Freddie Mac REMICs, Floating Rate Note, 11/15/18 511,764 313,853 0.80 NR/NR Freddie Mac REMICs, Floating Rate Note, 11/15/31 316,835 481,424 1.20 NR/NR Freddie Mac REMICs, Floating Rate Note, 11/15/33 490,830 304,068 0.55 NR/NR Freddie Mac REMICs, Floating Rate Note, 11/15/35 305,111 884,999 0.55 NR/NR Freddie Mac REMICs, Floating Rate Note, 11/15/36 887,576 440,277 0.45 NR/NR Freddie Mac REMICs, Floating Rate Note, 11/15/36 440,297 1,546,861 0.60 NR/NR Freddie Mac REMICs, Floating Rate Note, 11/15/37 1,551,787 955,353 0.60 NR/NR Freddie Mac REMICs, Floating Rate Note, 11/15/40 961,064 282,917 0.60 NR/NR Freddie Mac REMICs, Floating Rate Note, 12/15/20 284,775 707,864 0.65 NR/NR Freddie Mac REMICs, Floating Rate Note, 12/15/28 712,017 323,157 0.55 NR/NR Freddie Mac REMICs, Floating Rate Note, 12/15/32 323,600 55,915 0.65 NR/NR Freddie Mac REMICs, Floating Rate Note, 12/15/32 55,966 59,427 0.70 NR/NR Freddie Mac REMICs, Floating Rate Note, 12/15/32 59,875 The accompanying notes are an integral part of these financial statements. 54 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Government -- (continued) 611,025 0.60 NR/NR Freddie Mac REMICs, Floating Rate Note, 12/15/32 $ 613,030 922,729 0.55 NR/NR Freddie Mac REMICs, Floating Rate Note, 12/15/41 925,391 753,164 0.43 NR/NR Freddie Mac REMICs, Floating Rate Note, 2/15/19 754,025 943,443 0.50 NR/NR Freddie Mac REMICs, Floating Rate Note, 2/15/25 945,909 401,674 0.55 NR/NR Freddie Mac REMICs, Floating Rate Note, 2/15/29 402,579 823,008 0.75 NR/NR Freddie Mac REMICs, Floating Rate Note, 2/15/33 827,733 887,908 0.55 NR/NR Freddie Mac REMICs, Floating Rate Note, 2/15/36 889,388 1,588,992 0.50 NR/NR Freddie Mac REMICs, Floating Rate Note, 2/15/37 1,590,710 132,650 0.50 NR/NR Freddie Mac REMICs, Floating Rate Note, 2/15/39 132,771 2,289,395 1.30 NR/NR Freddie Mac REMICs, Floating Rate Note, 3/15/24 2,332,014 252,627 0.90 NR/NR Freddie Mac REMICs, Floating Rate Note, 3/15/32 255,507 1,882,887 0.50 NR/NR Freddie Mac REMICs, Floating Rate Note, 3/15/36 1,887,848 4,097,487 0.45 NR/NR Freddie Mac REMICs, Floating Rate Note, 3/15/37 4,093,516 575,874 0.65 NR/NR Freddie Mac REMICs, Floating Rate Note, 3/15/39 579,515 966,783 0.50 NR/NR Freddie Mac REMICs, Floating Rate Note, 3/15/41 968,173 613,509 0.50 NR/NR Freddie Mac REMICs, Floating Rate Note, 4/15/35 614,210 205,194 0.55 NR/NR Freddie Mac REMICs, Floating Rate Note, 5/15/29 205,032 425,324 1.70 NR/NR Freddie Mac REMICs, Floating Rate Note, 5/15/33 436,674 1,218,823 0.54 NR/NR Freddie Mac REMICs, Floating Rate Note, 5/15/35 1,222,442 1,758,719 0.50 NR/NR Freddie Mac REMICs, Floating Rate Note, 5/15/35 1,760,464 875,352 0.54 NR/NR Freddie Mac REMICs, Floating Rate Note, 5/15/37 877,967 519,671 1.45 NR/NR Freddie Mac REMICs, Floating Rate Note, 5/15/37 527,583 200,871 0.55 NR/NR Freddie Mac REMICs, Floating Rate Note, 5/15/41 201,588 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 55 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Government -- (continued) 334,474 0.65 NR/NR Freddie Mac REMICs, Floating Rate Note, 6/15/23 $ 336,398 295,411 0.60 NR/NR Freddie Mac REMICs, Floating Rate Note, 6/15/31 297,336 975,960 0.60 NR/NR Freddie Mac REMICs, Floating Rate Note, 6/15/33 978,053 5,105,344 0.51 NR/NR Freddie Mac REMICs, Floating Rate Note, 6/15/36 5,106,370 2,195,004 0.60 NR/NR Freddie Mac REMICs, Floating Rate Note, 6/15/38 2,200,534 562,771 0.45 NR/NR Freddie Mac REMICs, Floating Rate Note, 7/15/21 562,987 1,089,093 0.44 NR/NR Freddie Mac REMICs, Floating Rate Note, 7/15/34 1,087,815 190,252 0.70 NR/NR Freddie Mac REMICs, Floating Rate Note, 7/15/36 191,881 119,523 0.60 NR/NR Freddie Mac REMICs, Floating Rate Note, 7/15/36 119,840 2,640,043 0.40 NR/NR Freddie Mac REMICs, Floating Rate Note, 7/15/36 2,634,645 1,065,517 0.55 NR/NR Freddie Mac REMICs, Floating Rate Note, 7/15/40 1,064,336 3,114,431 0.65 NR/NR Freddie Mac REMICs, Floating Rate Note, 8/15/33 3,138,384 1,493,695 0.45 NR/NR Freddie Mac REMICs, Floating Rate Note, 8/15/35 1,494,798 524,137 0.80 NR/NR Freddie Mac REMICs, Floating Rate Note, 9/15/32 528,899 632,752 0.62 NR/NR Freddie Mac REMICs, Floating Rate Note, 9/15/36 636,438 557,629 0.60 NR/NR Freddie Mac REMICs, Floating Rate Note, 9/15/36 561,079 300,090 NR/NR Government National Mortgage Association, 4.5%, 11/20/34 306,984 204,468 NR/NR Government National Mortgage Association, 4.5%, 2/16/34 205,207 821,362 NR/NR Government National Mortgage Association, 4.5%, 5/20/33 835,717 394,748 NR/NR Government National Mortgage Association, 5.0%, 6/20/26 401,466 1,585,209 0.40 NR/NR Government National Mortgage Association, Floating Rate Note, 1/16/33 1,593,278 671,760 0.45 NR/NR Government National Mortgage Association, Floating Rate Note, 1/20/33 673,469 The accompanying notes are an integral part of these financial statements. 56 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Government -- (continued) 1,032,403 0.70 NR/NR Government National Mortgage Association, Floating Rate Note, 1/20/37 $ 1,034,150 714,199 0.88 NR/NR Government National Mortgage Association, Floating Rate Note, 10/16/39 726,184 1,260,140 0.60 NR/NR Government National Mortgage Association, Floating Rate Note, 10/20/38 1,263,956 454,188 0.60 NR/NR Government National Mortgage Association, Floating Rate Note, 2/20/38 455,320 761,660 0.50 NR/NR Government National Mortgage Association, Floating Rate Note, 4/16/29 768,632 331,272 0.75 NR/NR Government National Mortgage Association, Floating Rate Note, 4/16/32 335,114 1,749,739 0.60 NR/NR Government National Mortgage Association, Floating Rate Note, 5/16/38 1,759,621 334,618 0.70 NR/NR Government National Mortgage Association, Floating Rate Note, 6/16/31 338,050 136,800 0.85 NR/NR Government National Mortgage Association, Floating Rate Note, 7/20/40 136,865 2,562,931 0.45 NR/NR Government National Mortgage Association, Floating Rate Note, 7/20/41 2,570,846 889,496 1.20 NR/NR Government National Mortgage Association, Floating Rate Note, 8/16/39 902,557 1,333,616 0.60 NR/NR Government National Mortgage Association, Floating Rate Note, 8/20/35 1,335,936 805,840 0.70 NR/NR Government National Mortgage Association, Floating Rate Note, 8/20/38 813,741 1,074,460 0.45 NR/NR Government National Mortgage Association, Floating Rate Note, 9/16/31 1,081,661 -------------- $ 146,105,163 -------------- Total Government $ 146,105,163 ---------------------------------------------------------------------------------------------------------- TOTAL COLLATERALIZED MORTGAGE OBLIGATIONS (Cost $409,171,701) $ 411,874,759 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 57 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- CORPORATE BONDS -- 19.3% ENERGY -- 0.2% Integrated Oil & Gas -- 0.2% 2,520,000 0.68 AA-/Aa1 Total Capital Canada, Ltd., Floating Rate Note, 1/15/16 $ 2,531,166 -------------- Total Energy $ 2,531,166 ---------------------------------------------------------------------------------------------------------- MATERIALS -- 0.1% Diversified Chemicals -- 0.1% 990,000 A/A2 EI du Pont de Nemours & Co., 5.0%, 7/15/13 $ 1,003,118 -------------- Total Materials $ 1,003,118 ---------------------------------------------------------------------------------------------------------- CAPITAL GOODS -- 0.0%+ Aerospace & Defense -- 0.0%+ 570,000 0.56 A/A2 United Technologies Corp., Floating Rate Note, 12/2/13 $ 571,208 -------------- Total Capital Goods $ 571,208 ---------------------------------------------------------------------------------------------------------- AUTOMOBILES & COMPONENTS -- 0.4% Auto Parts & Equipment -- 0.2% 2,342,000 0.71 BBB+/Baa1 Johnson Controls, Inc., Floating Rate Note, 2/4/14 $ 2,348,593 ---------------------------------------------------------------------------------------------------------- Automobile Manufacturers -- 0.2% 300,000 1.08 A-/A3 Daimler Finance North America LLC, Floating Rate Note, 4/10/14 (144A) $ 301,142 300,000 1.64 A-/A3 Daimler Finance North America LLC, Floating Rate Note, 7/11/13 (144A) 300,804 790,000 A-/A3 Volkswagen International Finance NV, 1.625%, 8/12/13 (144A) 793,365 1,000,000 0.89 A-/A3 Volkswagen International Finance NV, Floating Rate Note, 11/20/14 (144A) 1,003,932 300,000 1.03 A-/A3 Volkswagen International Finance NV, Floating Rate Note, 3/21/14 (144A) 301,010 -------------- $ 2,700,253 -------------- Total Automobiles & Components $ 5,048,846 ---------------------------------------------------------------------------------------------------------- MEDIA -- 0.1% Broadcasting -- 0.1% 855,000 0.82 A-/A3 NBCUniversal Enterprise, Inc., Floating Rate Note, 4/15/16 (144A) $ 854,411 -------------- Total Media $ 854,411 ---------------------------------------------------------------------------------------------------------- FOOD & STAPLES RETAILING -- 0.1% Drug Retail -- 0.1% 1,000,000 BBB/Baa1 Walgreen Co., 4.875%, 8/1/13 $ 1,014,015 -------------- Total Food & Staples Retailing $ 1,014,015 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 58 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- FOOD, BEVERAGE & TOBACCO -- 0.4% Soft Drinks -- 0.1% 860,000 0.50 A-/Aa3 PepsiCo, Inc., Floating Rate Note, 2/26/16 $ 860,504 850,000 0.26 AA-/Aa3 The Coca-Cola Co., Floating Rate Note, 3/5/15 850,322 -------------- $ 1,710,826 ---------------------------------------------------------------------------------------------------------- Packaged Foods & Meats -- 0.1% 1,500,000 0.60 BBB+/A2 Campbell Soup Co., Floating Rate Note, 8/1/14 $ 1,503,981 ---------------------------------------------------------------------------------------------------------- Tobacco -- 0.2% 700,000 A/A2 Philip Morris International, Inc., 4.875%, 5/16/13 $ 703,891 1,500,000 0.34 A/A2 Philip Morris International, Inc., Floating Rate Note, 2/26/15 1,501,155 -------------- $ 2,205,046 -------------- Total Food, Beverage & Tobacco $ 5,419,853 ---------------------------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 0.5% Health Care Equipment -- 0.5% 5,715,000 A/Baa1 Covidien International Finance SA, 1.875%, 6/15/13 $ 5,731,385 500,000 A/Baa1 St. Jude Medical, Inc., 2.2%, 9/15/13 503,847 -------------- $ 6,235,232 -------------- Total Health Care Equipment & Services $ 6,235,232 ---------------------------------------------------------------------------------------------------------- PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 0.2% Life Sciences Tools & Services -- 0.2% 2,950,000 BBB+/Baa2 Agilent Technologies, Inc., 2.5%, 7/15/13 $ 2,966,957 -------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 2,966,957 ---------------------------------------------------------------------------------------------------------- BANKS -- 4.1% Diversified Banks -- 2.0% 250,000 2.29 A/Aa3 Banco Santander Chile, Floating Rate Note, 2/14/14 (144A) $ 247,678 250,000 1.34 A+/Aa2 Bank of Nova Scotia, Floating Rate Note, 1/12/15 253,290 1,575,000 0.76 AA-/Aa2 Cooperatieve Centrale Raiffeisen-Boerenleenbank BA Netherlands, Floating Rate Note, 3/18/16 1,577,794 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 59 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Diversified Banks -- (continued) 400,000 0.50 AA-/Aa2 Cooperatieve Centrale Raiffeisen-Boerenleenbank BA Netherlands, Floating Rate Note, 7/25/13 $ 400,244 3,520,000 1.10 AA-/Aa3 HSBC Bank Plc, Floating Rate Note, 1/17/14 (144A) 3,540,592 1,400,000 0.94 AA-/Aa3 HSBC Bank Plc, Floating Rate Note, 8/12/13 (144A) 1,402,923 200,000 1.00 AA-/Aa3 Royal Bank of Canada, Floating Rate Note, 10/30/14 201,753 2,000,000 0.60 AA-/Aa3 Royal Bank of Canada, Floating Rate Note, 4/17/14 2,005,786 1,275,000 0.73 AA-/Aa3 Svenska Handelsbanken AB, Floating Rate Note, 3/21/16 1,274,243 1,500,000 0.75 AA-/Aa1 The Toronto-Dominion Bank, Floating Rate Note, 11/1/13 1,504,012 200,000 0.60 AA-/Aa1 The Toronto-Dominion Bank, Floating Rate Note, 7/14/14 200,523 1,000,000 A+/A1 US Bancorp, 1.375%, 9/13/13 1,003,500 2,529,000 A+/A1 US Bancorp, 2.0%, 6/14/13 2,538,160 628,000 0.64 A/A3 Wachovia Corp., Floating Rate Note, 10/28/15 623,951 1,725,000 2.07 A+/A2 Wachovia Corp., Floating Rate Note, 5/1/13 1,727,417 100,000 0.49 A+/A2 Wachovia Corp., Floating Rate Note, 8/1/13 100,084 2,503,000 0.50 A+/A2 Wells Fargo & Co., Floating Rate Note, 10/28/15 2,493,466 1,500,000 1.20 A+/A2 Wells Fargo & Co., Floating Rate Note, 6/26/15 1,519,606 1,935,000 1.01 AA-/Aa2 Westpac Banking Corp., Floating Rate Note, 12/9/13 1,944,946 1,000,000 0.52 AA-/Aa2 Westpac Banking Corp., Floating Rate Note, 3/28/14 999,958 500,000 1.10 NR/Aaa Westpac Banking Corp., Floating Rate Note, 7/17/15 (144A) 505,376 -------------- $ 26,065,302 ---------------------------------------------------------------------------------------------------------- Regional Banks -- 2.0% 1,660,000 A-/A2 American Express Bank FSB, 5.5%, 4/16/13 $ 1,662,314 1,573,000 1.00 A-/A2 BB&T Corp., Floating Rate Note, 4/28/14 1,582,238 1,000,000 0.60 A-/A2 Branch Banking & Trust Co., Floating Rate Note, 9/13/16 988,869 1,500,000 0.73 BBB+/A3 Capital One NA, Floating Rate Note, 3/22/16 1,499,990 The accompanying notes are an integral part of these financial statements. 60 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Regional Banks -- (continued) 3,775,000 BBB/Baa1 Fifth Third Bancorp, 6.25%, 5/1/13 $ 3,792,101 1,000,000 0.70 BBB-/Baa2 Fifth Third Bancorp, Floating Rate Note, 12/20/16 984,428 1,900,000 0.40 BBB+/A3 Fifth Third Bank Cincinnati Ohio, Floating Rate Note, 5/17/13 1,899,970 500,000 BBB-/Baa2 First Tennessee Bank NA, 4.625%, 5/15/13 502,085 5,345,000 BBB+/Baa1 KeyCorp, 6.5%, 5/14/13 5,381,742 1,000,000 0.44 A+/Aa3 Mellon Funding Corp., Floating Rate Note, 5/15/14 1,000,526 2,100,000 0.63 A-/A3 National City Bank Cleveland Ohio, Floating Rate Note, 12/15/16 2,084,752 750,000 0.61 NR/A2 PNC Bank NA, Floating Rate Note, 1/28/16 751,269 2,294,000 0.50 A-/A3 PNC Funding Corp., Floating Rate Note, 1/31/14 2,295,932 350,000 0.48 A+/Aa3 State Street Bank and Trust Co., Floating Rate Note, 12/8/15 347,226 1,425,000 0.58 A+/A1 US Bank NA Cincinnati Ohio, Floating Rate Note, 10/14/14 1,428,055 -------------- $ 26,201,497 ---------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- 0.1% 1,000,000 AAA/Aaa BRFkredit AS, 2.05%, 4/15/13 (144A) $ 1,000,610 1,220,000 0.73 AAA/Aaa Swedbank Hypotek AB, Floating Rate Note, 3/28/14 (144A) 1,224,340 -------------- $ 2,224,950 -------------- Total Banks $ 54,491,749 ---------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 8.3% Other Diversified Financial Services -- 4.0% 3,000,000 1.10 A-/Baa2 Bank of America Corp., Floating Rate Note, 3/22/16 $ 2,988,615 2,080,000 6.50 BB+/NR Caelus Re II, Ltd., Floating Rate Note, 5/24/13 (Cat Bond) (144A) 2,093,104 2,500,000 0.00 BB-/NR Caelus Re, Ltd., Floating Rate Note, 3/7/16 (Cat Bond) (144A) 2,498,000 800,000 NR/NR Caelus Re, Ltd., Floating Rate Note, 4/7/17 (Cat Bond) (144A) 800,000 3,410,000 A-/Baa2 Citigroup, Inc., 5.5%, 4/11/13 3,413,976 675,000 0.58 A-/Baa2 Citigroup, Inc., Floating Rate Note, 11/5/14 672,237 1,325,000 1.08 A-/NR Citigroup, Inc., Floating Rate Note, 4/1/16 1,325,771 2,942,000 2.29 A-/Baa2 Citigroup, Inc., Floating Rate Note, 8/13/13 2,961,352 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 61 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Other Diversified Financial Services -- (continued) 250,000 9.00 BB-/NR Compass Re, Ltd., Floating Rate Note, 1/8/15 (Cat Bond) (144A) $ 258,050 1,000,000 10.25 BB-/NR Compass Re, Ltd., Floating Rate Note, 1/8/15 (Cat Bond) (144A) 1,036,100 250,000 11.25 B+/NR Compass Re, Ltd., Floating Rate Note, 1/8/15 (Cat Bond) (144A) 254,525 250,000 9.00 BB/NR East Lane Re V, Ltd., Floating Rate Note, 3/16/16 (Cat Bond) (144A) 270,225 1,320,000 6.60 BB-/NR Embarcadero Reinsurance, Ltd., Floating Rate Note, 8/4/14 (Cat Bond) (144A) 1,342,308 525,000 5.00 BB+/NR Embarcadero Reinsurance, Ltd., Floating Rate Note, 8/7/15 (Cat Bond) (144A) 541,065 822,000 1.16 AA+/A1 General Electric Capital Corp., Floating Rate Note, 1/7/14 827,395 1,000,000 0.90 AA+/A1 General Electric Capital Corp., Floating Rate Note, 1/8/16 1,004,932 200,000 1.00 AA+/A1 General Electric Capital Corp., Floating Rate Note, 4/24/14 201,424 1,967,000 0.94 AA+/A1 General Electric Capital Corp., Floating Rate Note, 4/7/14 1,974,555 365,000 1.19 AA+/A1 General Electric Capital Corp., Floating Rate Note, 5/22/13 365,562 500,000 1.34 AA+/A1 General Electric Capital Corp., Floating Rate Note, 7/2/15 506,915 500,000 1.38 AA+/A1 General Electric Capital Corp., Floating Rate Note, 8/1/17 500,150 1,645,000 1.28 AA+/A1 General Electric Capital Corp., Floating Rate Note, 9/23/13 1,652,421 300,000 8.35 BB-/NR Ibis Re II, Ltd., Floating Rate Note, 2/5/15 (Cat Bond) (144A) 307,140 2,500,000 6.20 BB-/NR Ibis Re, Ltd., Floating Rate Note, 5/3/13 (Cat Bond) (144A) 2,508,000 500,000 9.25 B/NR Ibis Re, Ltd., Floating Rate Note, 5/3/13 (Cat Bond) (144A) 503,150 1,250,000 1.10 A/A2 JPMorgan Chase & Co., Floating Rate Note, 1/24/14 1,257,489 2,000,000 0.96 A/A2 JPMorgan Chase & Co., Floating Rate Note, 10/15/15 2,010,576 1,800,000 0.91 A/A2 JPMorgan Chase & Co., Floating Rate Note, 2/26/16 1,801,048 250,000 6.00 BB/NR Lodestone Re, Ltd., Floating Rate Note, 1/8/14 (Cat Bond) (144A) 252,175 2,000,000 7.25 BB/NR Lodestone Re, Ltd., Floating Rate Note, 1/8/14 (Cat Bond) (144A) 2,019,200 800,000 6.25 BB/NR Lodestone Re, Ltd., Floating Rate Note, 5/17/13 (Cat Bond) (144A) 802,880 The accompanying notes are an integral part of these financial statements. 62 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Other Diversified Financial Services -- (continued) 2,600,000 8.25 BB-/NR Lodestone Re, Ltd., Floating Rate Note, 5/17/13 (Cat Bond) (144A) $ 2,615,080 500,000 7.50 BB-/NR Queen Street II Capital, Ltd., Floating Rate Note, 4/9/14 (Cat Bond) (144A) 505,300 500,000 7.50 BB-/NR Queen Street IV Capital, Ltd., Floating Rate Note, 4/9/15 (Cat Bond) (144A) 504,700 250,000 8.50 B+/NR Queen Street V Re, Ltd., Floating Rate Note, 4/9/15 (Cat Bond) (144A) 256,525 500,000 13.00 B-/NR Residential Reinsurance 2010, Ltd., Floating Rate Note, 6/6/13 (Cat Bond) (144A) 509,750 1,000,000 6.25 BB/NR Residential Reinsurance 2010, Ltd., Floating Rate Note, 6/6/13 (Cat Bond) (144A) 1,009,600 250,000 10.75 NR/NR Residential Reinsurance 2010, Ltd., Floating Rate Note, 6/6/13 (Cat Bond) (144A) 253,525 2,500,000 6.60 BB/NR Residential Reinsurance 2010, Ltd., Floating Rate Note, 6/6/13 (Cat Bond) (144A) 2,526,000 500,000 9.00 BB-/NR Residential Reinsurance 2011, Ltd., Floating Rate Note, 6/6/15 (Cat Bond) (144A) 524,650 2,000,000 7.00 BB/NR Shore Re, Ltd., Floating Rate Note, 7/8/13 (Cat Bond) (144A) 2,019,200 400,000 3.10 BBB-/NR Vita Capital IV, Ltd., Floating Rate Note, 1/15/16 (Cat Bond) (144A) 405,320 1,500,000 2.90 BBB-/NR Vita Capital V, Ltd., Floating Rate Note, 1/15/17 (Cat Bond) (144A) 1,533,150 500,000 3.60 BB+/NR Vita Capital V, Ltd., Floating Rate Note, 1/15/17 (Cat Bond) (144A) 506,350 -------------- $ 52,119,490 ---------------------------------------------------------------------------------------------------------- Specialized Finance -- 0.4% 1,000,000 5.25 BB+/NR Kibou, Ltd., Floating Rate Note, 2/16/15 (Cat Bond) (144A) $ 1,034,900 2,790,000 0.38 A/A2 National Rural Utilities Cooperative Finance Corp., Floating Rate Note, 2/18/14 2,790,031 1,500,000 NR/Aaa Private Export Funding Corp., 4.974%, 8/15/13 1,527,432 -------------- $ 5,352,363 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 63 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Consumer Finance -- 2.3% 1,370,000 BBB+/A3 American Express Co., 4.875%, 7/15/13 $ 1,387,129 1,475,000 A-/A2 American Express Credit Corp., 5.875%, 5/2/13 1,481,422 1,100,000 1.90 A-/A2 American Express Credit Corp., Floating Rate Note, 6/19/13 1,103,785 2,025,000 1.13 A-/A2 American Express Credit Corp., Floating Rate Note, 6/24/14 2,040,204 1,500,000 0.43 A+/A1 American Honda Finance Corp., Floating Rate Note, 4/8/14 (144A) 1,499,796 1,275,000 0.74 A+/A1 American Honda Finance Corp., Floating Rate Note, 5/8/14 (144A) 1,280,695 1,500,000 0.68 A+/A1 American Honda Finance Corp., Floating Rate Note, 6/18/14 (144A) 1,505,146 550,000 0.90 A+/A1 American Honda Finance Corp., Floating Rate Note, 8/5/13 (144A) 551,263 3,550,000 BBB/Baa1 Capital One Bank USA NA, 6.5%, 6/13/13 3,591,815 2,242,000 1.45 BBB/Baa1 Capital One Financial Corp., Floating Rate Note, 7/15/14 2,266,364 1,500,000 0.53 A/A2 Caterpillar Financial Services Corp., Floating Rate Note, 2/26/16 1,501,311 2,000,000 0.64 A/A2 Caterpillar Financial Services Corp., Floating Rate Note, 2/9/15 2,008,504 897,000 0.45 A/A2 John Deere Capital Corp., Floating Rate Note, 4/25/14 898,334 2,863,000 0.65 A+/A1 PACCAR Financial Corp., Floating Rate Note, 4/5/13 2,863,117 250,000 0.53 A+/A1 PACCAR Financial Corp., Floating Rate Note, 6/5/14 250,672 554,000 AA-/Aa3 Toyota Motor Credit Corp., 1.25%, 11/17/14 560,920 1,000,000 0.70 AA-/Aa3 Toyota Motor Credit Corp., Floating Rate Note, 1/17/14 1,003,459 1,290,000 0.47 AA-/Aa3 Toyota Motor Credit Corp., Floating Rate Note, 1/23/15 1,290,013 3,290,000 0.76 AA-/Aa3 Toyota Motor Credit Corp., Floating Rate Note, 10/11/13 3,297,708 500,000 0.55 AA-/Aa3 Toyota Motor Credit Corp., Floating Rate Note, 4/23/13 500,139 -------------- $ 30,881,796 ---------------------------------------------------------------------------------------------------------- Asset Management & Custody Banks -- 0.5% 2,600,000 0.63 A+/A1 State Street Corp., Floating Rate Note, 3/7/14 $ 2,606,157 100,000 A+/Aa3 The Bank of New York Mellon Corp., 4.5%, 4/1/13 100,000 The accompanying notes are an integral part of these financial statements. 64 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Asset Management & Custody Banks -- (continued) 1,300,000 0.58 A+/Aa3 The Bank of New York Mellon Corp., Floating Rate Note, 1/31/14 $ 1,302,492 485,000 0.53 A+/Aa3 The Bank of New York Mellon Corp., Floating Rate Note, 10/23/15 485,378 1,000,000 0.51 A+/Aa3 The Bank of New York Mellon Corp., Floating Rate Note, 3/4/16 999,705 1,200,000 0.57 A+/Aa3 The Bank of New York Mellon Corp., Floating Rate Note, 7/28/14 1,201,868 -------------- $ 6,695,600 ---------------------------------------------------------------------------------------------------------- Investment Banking & Brokerage -- 1.1% 3,502,000 A-/Baa2 Merrill Lynch & Co, Inc., 6.15%, 4/25/13 $ 3,514,285 1,620,000 1.90 A-/Baa1 Morgan Stanley, Floating Rate Note, 1/24/14 1,633,365 1,700,000 1.54 A-/Baa1 Morgan Stanley, Floating Rate Note, 2/25/16 1,707,244 1,050,000 1.28 A-/Baa1 Morgan Stanley, Floating Rate Note, 4/29/13 1,050,563 100,000 2.79 A-/Baa1 Morgan Stanley, Floating Rate Note, 5/14/13 100,262 400,000 1.02 A/A2 The Bear Stearns Companies LLC, Floating Rate Note, 10/28/14 401,435 1,000,000 1.29 A-/A3 The Goldman Sachs Group, Inc., Floating Rate Note, 11/21/14 1,004,900 1,514,000 1.30 A-/A3 The Goldman Sachs Group, Inc., Floating Rate Note, 2/7/14 1,521,384 2,000,000 0.73 A-/A3 The Goldman Sachs Group, Inc., Floating Rate Note, 3/22/16 1,977,234 2,000,000 0.88 A-/A3 The Goldman Sachs Group, Inc., Floating Rate Note, 9/29/14 2,000,000 -------------- $ 14,910,672 -------------- Total Diversified Financials $ 109,959,921 ---------------------------------------------------------------------------------------------------------- INSURANCE -- 3.3% Life & Health Insurance -- 0.9% 5,392,000 A+/A1 Allstate Life Global Funding Trusts, 5.375%, 4/30/13 $ 5,413,660 1,000,000 0.68 AA-/Aa3 MetLife Institutional Funding II, Floating Rate Note, 1/6/15 (144A) 1,001,056 600,000 1.55 A-/A3 MetLife, Inc., Floating Rate Note, 8/6/13 602,491 2,800,000 A-/Baa2 Protective Life Corp., 4.3%, 6/1/13 2,816,010 500,000 0.57 BBB/Baa1 Sun Life Financial Global Funding III LP, Floating Rate Note, 10/6/13 (144A) 499,924 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 65 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Life & Health Insurance -- (continued) 1,000,000 2.75 BBB+/NR Vitality Re IV, Ltd., Floating Rate Note, 1/9/16 (Cat Bond) (144A) $ 1,012,700 1,000,000 4.56 BBB+/NR Vitality Re, Ltd., Floating Rate Note, 1/7/14 (Cat Bond) (144A) 1,021,100 -------------- $ 12,366,941 ---------------------------------------------------------------------------------------------------------- Multi-line Insurance -- 0.4% 520,000 AA-/Aa3 Metropolitan Life Global Funding I, 2.0%, 1/10/14 (144A) $ 525,764 1,130,000 AA-/Aa3 Metropolitan Life Global Funding I, 5.125%, 4/10/13 (144A) 1,131,063 680,000 1.06 AA-/Aa3 Metropolitan Life Global Funding I, Floating Rate Note, 1/10/14 (144A) 683,567 1,000,000 AA+/Aaa New York Life Global Funding, 0.75%, 7/24/15 (144A) 1,003,524 1,300,000 0.30 AA+/Aaa New York Life Global Funding, Floating Rate Note, 7/30/14 (144A) 1,300,361 -------------- $ 4,644,279 ---------------------------------------------------------------------------------------------------------- Reinsurance -- 2.0% 750,000 8.18 BB-/NR Atlas Reinsurance VII, Ltd., Floating Rate Note, 1/7/16 (Cat Bond) (144A) $ 758,400 600,000 6.30 BB+/NR Blue Danube, Ltd., Floating Rate Note, 4/10/15 (Cat Bond) (144A) 626,820 945,000 11.05 BB-/NR Blue Danube, Ltd., Floating Rate Note, 4/10/15 (Cat Bond) (144A) 1,012,756 500,000 9.25 BB/NR Blue Fin, Ltd., Floating Rate Note, 5/28/13 (Cat Bond) (144A) 504,800 500,000 14.00 B-/NR Blue Fin, Ltd., Floating Rate Note, 5/28/13 (Cat Bond) (144A) 506,750 500,000 4.50 NR/Baa1 Combine Re, Ltd., Floating Rate Note, 1/7/15 (Cat Bond) (144A) 513,250 1,500,000 10.00 NR/Ba2 Combine Re, Ltd., Floating Rate Note, 1/7/15 (Cat Bond) (144A) 1,610,850 500,000 0.00 B/NR Everglades Re, Ltd., Floating Rate Note, 3/28/16 (Cat Bond) (144A) 508,550 1,000,000 17.75 B+/NR Everglades Re, Ltd., Floating Rate Note, 4/30/14 (Cat Bond) (144A) 1,092,400 1,550,000 5.00 BB+/NR Foundation Re III, Ltd., Floating Rate Note, 2/25/15 (Cat Bond) 1,616,650 2,000,000 5.75 BB/NR Foundation Re III, Ltd., Floating Rate Note, 2/3/14 (Cat Bond) (144A) 2,025,400 750,000 3.75 BB+/NR Golden State Re, Ltd., Floating Rate Note, 1/8/15 (Cat Bond) (144A) 768,750 2,000,000 6.50 BB-/NR Johnston Re, Ltd., Floating Rate Note, 5/8/13 (Cat Bond) (144A) 2,008,400 750,000 6.00 BB+/NR Longpoint Re, Ltd., Floating Rate Note, 6/12/15 (Cat Bond) (144A) 781,350 The accompanying notes are an integral part of these financial statements. 66 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Reinsurance -- (continued) 1,000,000 9.00 BB/NR Mystic Re, Ltd., Floating Rate Note, 3/12/15 (Cat Bond) (144A) $ 1,047,600 500,000 12.00 B/NR Mystic Re, Ltd., Floating Rate Note, 3/12/15 (Cat Bond) (144A) 529,600 1,500,000 8.71 B+/NR Mythen Re, Ltd. Series 2012-2 Class A, Floating Rate Note, 1/5/17 (Cat Bond) (144A) 1,514,250 250,000 11.94 B-/NR Mythen Re, Ltd. Series 2012-2 Class A, Floating Rate Note, 11/10/16 (Cat Bond) (144A) 246,425 500,000 8.72 NR/Ba3 Mythen, Ltd., Floating Rate Note, 5/7/15 (Cat Bond) (144A) 533,150 1,000,000 8.22 NR/Ba3 Mythen, Ltd., Floating Rate Note, 5/7/15 (Cat Bond) (144A) 1,066,500 250,000 13.75 NR/NR Pelican Re, Ltd., Floating Rate Note, 4/13/15 (Cat Bond) (144A) 262,725 250,000 10.35 B/NR Queen Street VI Re, Ltd., Floating Rate Note, 4/9/15 (Cat Bond) (144A) 260,950 800,000 8.60 B/NR Queen Street VII Re, Ltd., Floating Rate Note, 4/8/16 (Cat Bond) (144A) 804,560 2,000,000 4.50 BB+/NR Residential Reinsurance 2012, Ltd., Floating Rate Note, 12/6/16 (Cat Bond) (144A) 2,022,800 250,000 10.00 BB-/NR Residential Reinsurance 2012, Ltd., Floating Rate Note, 6/6/16 (Cat Bond) (144A) 273,150 750,000 8.00 BB/NR Residential Reinsurance 2012, Ltd., Floating Rate Note, 6/6/16 (Cat Bond) (144A) 790,425 1,150,000 9.41 B/NR Successor X, Ltd. Class IV-E3, Floating Rate Note, 2/25/14 (Cat Bond) (144A) 1,155,635 250,000 16.75 NR/NR Successor X, Ltd., Floating Rate Note, 4/4/13 (Cat Bond) (144A) 250,550 500,000 9.75 NR/NR Successor X, Ltd., Floating Rate Note, 4/4/13 (Cat Bond) (144A) 500,350 750,000 11.75 NR/NR Successor X, Ltd., Floating Rate Note, 4/4/13 (Cat Bond) (144A) 750,825 -------------- $ 26,344,621 -------------- Total Insurance $ 43,355,841 ---------------------------------------------------------------------------------------------------------- TECHNOLOGY HARDWARE & EQUIPMENT -- 0.1% Office Electronics -- 0.1% 1,050,000 1.68 BBB-/Baa2 Xerox Corp., Floating Rate Note, 9/13/13 $ 1,054,051 -------------- Total Technology Hardware & Equipment $ 1,054,051 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 67 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- TELECOMMUNICATION SERVICES -- 0.4% Integrated Telecommunication Services -- 0.3% 1,330,000 1.41 BBB/Baa2 British Telecommunications Plc, Floating Rate Note, 12/20/13 $ 1,340,414 1,000,000 BBB+/Baa1 Deutsche Telekom International Finance BV, 5.25%, 7/22/13 1,013,970 1,000,000 NR/Ba2 GTP Towers Issuer LLC, 8.112%, 2/15/15 (144A) 1,066,940 500,000 BBB/Baa3 Telecom Italia Capital SA, 5.25%, 11/15/13 510,422 -------------- $ 3,931,746 ---------------------------------------------------------------------------------------------------------- Wireless Telecommunication Services -- 0.1% 1,150,000 0.68 A-/A3 Vodafone Group Plc, Floating Rate Note, 2/19/16 $ 1,148,871 -------------- Total Telecommunication Services $ 5,080,617 ---------------------------------------------------------------------------------------------------------- UTILITIES -- 1.1% Electric Utilities -- 0.5% 1,341,000 BBB/Baa2 Duke Energy Corp., 5.65%, 6/15/13 $ 1,354,752 1,090,000 0.60 A/A3 Georgia Power Co., Floating Rate Note, 3/15/16 1,090,631 1,175,000 BBB+/Baa2 Northeast Utilities, 5.65%, 6/1/13 1,184,706 3,222,000 1.03 BBB+/Baa2 Northeast Utilities, Floating Rate Note, 9/20/13 3,232,372 -------------- $ 6,862,461 ---------------------------------------------------------------------------------------------------------- Multi-Utilities -- 0.3% 2,820,000 A-/Baa2 Dominion Resources, Inc. Virginia, 1.8%, 3/15/14 $ 2,851,198 1,495,000 1.04 BBB+/Baa1 Sempra Energy, Floating Rate Note, 3/15/14 1,502,713 -------------- $ 4,353,911 ---------------------------------------------------------------------------------------------------------- Independent Power Producers & Energy Traders -- 0.3% 2,100,000 6.65 BB/NR East Lane Re, Ltd., Floating Rate Note, 3/13/15 (Cat Bond) (144A) $ 2,186,310 1,350,000 5.75 BB+/NR East Lane Re, Ltd., Floating Rate Note, 3/14/14 (Cat Bond) (144A) 1,377,405 -------------- $ 3,563,715 -------------- Total Utilities $ 14,780,087 ---------------------------------------------------------------------------------------------------------- TOTAL CORPORATE BONDS (Cost $253,406,435) $ 254,367,072 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 68 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- U.S. GOVERNMENT AND AGENCY OBLIGATIONS -- 7.6% 6,831 AAA/Aaa Fannie Mae, 6.5%, 1/1/15 $ 7,023 14,733 AAA/Aaa Fannie Mae, 7.0%, 10/1/17 15,812 29,039 2.65 AAA/Aaa Fannie Mae, Floating Rate Note, 1/1/48 30,956 29,598 2.54 AAA/Aaa Fannie Mae, Floating Rate Note, 10/1/32 31,685 18,567 2.28 AAA/Aaa Fannie Mae, Floating Rate Note, 11/1/23 19,328 33,017 2.42 AAA/Aaa Fannie Mae, Floating Rate Note, 2/1/34 33,725 7,383 2.70 AAA/Aaa Fannie Mae, Floating Rate Note, 4/1/15 7,417 26,694 2.31 AAA/Aaa Fannie Mae, Floating Rate Note, 9/1/32 28,398 500,000 AA+/Aaa Federal Farm Credit Banks, 0.875%, 6/14/16 500,662 100,000 0.26 AA+/Aaa Federal Farm Credit Banks, Floating Rate Note, 10/15/13 100,074 5,000,000 0.10 AA+/Aaa Federal Farm Credit Banks, Floating Rate Note, 2/10/14 5,002,270 6,000,000 0.42 AA+/Aaa Federal Farm Credit Banks, Floating Rate Note, 3/17/14 6,014,430 2,000,000 0.40 AA+/Aaa Federal Farm Credit Banks, Floating Rate Note, 3/6/14 2,004,308 1,000,000 0.26 AA+/Aaa Federal Farm Credit Banks, Floating Rate Note, 4/25/14 1,001,227 1,000,000 0.40 AA+/Aaa Federal Farm Credit Banks, Floating Rate Note, 5/29/14 1,002,891 1,230,000 0.25 AA+/Aaa Federal Farm Credit Banks, Floating Rate Note, 7/16/14 1,231,123 5,000,000 0.23 AA+/Aaa Federal Farm Credit Banks, Floating Rate Note, 7/29/13 5,002,170 3,000,000 0.24 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 1/15/14 3,002,424 3,600,000 0.25 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 1/2/14 3,602,142 1,000,000 0.21 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 11/15/13 1,000,462 4,570,000 0.22 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 12/20/13 4,572,641 6,150,000 0.28 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 2/28/14 6,157,448 1,250,000 0.25 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 3/11/14 1,251,199 3,000,000 0.33 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 4/12/13 3,000,183 670,000 0.18 AA+/NR Federal Home Loan Banks, Floating Rate Note, 4/12/13 669,996 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 69 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- U.S. Government and Agency Obligations -- (continued) 300,000 0.34 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 4/5/13 $ 300,005 450,000 0.31 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 5/2/13 450,073 2,500,000 0.30 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 6/7/13 2,500,868 5,515,000 0.24 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 7/22/13 5,517,454 3,675,000 0.28 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 8/1/13 3,676,896 7,000,000 0.17 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 8/22/13 7,001,470 485,000 0.36 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 9/16/13 485,533 4,759 AAA/Aaa Federal Home Loan Mortgage Corp., 7.0%, 6/1/14 4,863 13,446 2.36 AAA/Aaa Federal Home Loan Mortgage Corp., Floating Rate Note, 10/1/23 14,362 16,352 2.86 AAA/Aaa Federal Home Loan Mortgage Corp., Floating Rate Note, 11/1/33 17,525 6,240,000 0.43 AA+/Aaa Federal Home Loan Mortgage Corp., Floating Rate Note, 11/18/13 6,251,519 8,839 4.60 AAA/Aaa Federal Home Loan Mortgage Corp., Floating Rate Note, 6/1/35 9,396 2,020,000 0.34 AA+/Aaa Federal Home Loan Mortgage Corp., Floating Rate Note, 8/12/13 2,021,568 2,000,000 0.39 AA+/Aaa Federal National Mortgage Association, Floating Rate Note, 10/25/13 2,002,896 16,308,000 0.29 AA+/Aaa Federal National Mortgage Association, Floating Rate Note, 3/4/14 16,329,951 2,000,000 0.36 AA+/Aaa Federal National Mortgage Association, Floating Rate Note, 6/23/14 2,004,300 6,160,000 0.38 AA+/Aaa Federal National Mortgage Association, Floating Rate Note, 8/9/13 6,165,113 17,072 1.62 AAA/Aaa Government National Mortgage Association II, Floating Rate Note, 1/20/22 17,793 544,740 AA+/Aaa U.S. Treasury Inflation Indexed Bonds, 0.625%, 4/15/13 546,825 ---------------------------------------------------------------------------------------------------------- TOTAL U.S. GOVERNMENT AND AGENCY OBLIGATIONS (Cost $100,564,904) $ 100,608,404 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 70 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- MUNICIPAL BONDS -- 3.4% Municipal Development -- 0.4% 3,005,000 0.13 NR/Aa1 Mississippi Business Finance Corp., Floating Rate Note, 12/1/30 $ 3,005,000 1,860,000 0.13 AA/Aa1 Mississippi Business Finance Corp., Floating Rate Note, 12/1/30 1,860,000 -------------- $ 4,865,000 ---------------------------------------------------------------------------------------------------------- Municipal General -- 0.1% 200,000 1.28 A+/A1 New Jersey Economic Development Authority, Floating Rate Note, 6/15/13 $ 200,076 1,000,000 NR/NR State of California, 2.5%, 6/20/13 1,005,300 -------------- $ 1,205,376 ---------------------------------------------------------------------------------------------------------- Municipal Higher Education -- 1.8% 6,290,000 0.10 AAA/Aaa Connecticut State Health & Educational Facility Authority, Floating Rate Note, 7/1/33 $ 6,290,000 10,955,000 0.10 AA/Aa2 Maryland Health & Higher Educational Facilities Authority, Floating Rate Note, 7/1/36 10,955,000 250,000 0.78 AA/Aa1 University of California, Floating Rate Note, 7/1/41 250,432 6,470,000 0.11 AAA/Aaa University of Michigan, Floating Rate Note, 12/1/29 6,470,000 -------------- $ 23,965,432 ---------------------------------------------------------------------------------------------------------- Municipal Housing -- 0.1% 500,000 AA-/Aa3 Massachusetts Housing Finance Agency, 0.467%, 6/1/13 $ 500,065 ---------------------------------------------------------------------------------------------------------- Municipal Medical -- 0.9% 4,100,000 0.14 AA/NR Harris County Health Facilities Development Corp., Floating Rate Note, 12/1/41 $ 4,100,000 7,000,000 0.10 AAA/Aaa Loudoun County Industrial Development Authority, Floating Rate Note, 2/15/38 7,000,000 -------------- $ 11,100,000 ---------------------------------------------------------------------------------------------------------- Municipal Power -- 0.1% 1,000,000 0.90 NR/Aa3 South Carolina State Public Service Authority, Floating Rate Note, 6/2/14 $ 1,005,500 250,000 0.70 NR/Aa3 South Carolina State Public Service Authority, Floating Rate Note, 7/1/13 250,165 -------------- $ 1,255,665 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 71 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Municipal Student Loan -- 0.1% 1,250,000 1.00 AA+/NR Louisiana Public Facilities Authority, Floating Rate Note, 4/26/27 $ 1,262,675 ---------------------------------------------------------------------------------------------------------- TOTAL MUNICIPAL BONDS (Cost $44,144,763) $ 44,154,213 ---------------------------------------------------------------------------------------------------------- SENIOR FLOATING RATE LOAN INTERESTS -- 7.1%** ENERGY -- 0.2% Oil & Gas Drilling -- 0.0%+ 500,000 0.00 NR/B3 Offshore Group Investment, Ltd., Term Loan, 3/28/19 $ 503,750 ---------------------------------------------------------------------------------------------------------- Integrated Oil & Gas -- 0.0%+ 57,026 4.50 BBB/Baa2 Glenn Pool Oil & Gas Trust, Term Loan, 6/1/16 $ 57,311 ---------------------------------------------------------------------------------------------------------- Oil & Gas Exploration & Production -- 0.1% 250,000 5.75 BB-/Ba3 Chesapeake Energy Corp., Term Loan, 12/2/17 $ 258,170 300,000 6.00 B/B1 Samson Investment Co., Initial Term Loan (Second Lien), 9/10/16 304,350 -------------- $ 562,520 ---------------------------------------------------------------------------------------------------------- Oil & Gas Refining & Marketing -- 0.1% 99,500 3.75 BB/Ba2 Pilot Travel Centers LLC, Refinancing Tranche B Term Loan, 3/30/18 $ 100,631 1,000,000 0.00 BBB-/Ba1 Tesoro Corp., Initial Term Loan, 1/11/16 1,013,750 -------------- $ 1,114,381 ---------------------------------------------------------------------------------------------------------- Oil & Gas Storage & Transportation -- 0.0%+ 222,750 4.75 BB-/Ba3 Gibson Energy, Inc., Tranche B Term Loan, 6/30/18 $ 226,091 -------------- Total Energy $ 2,464,053 ---------------------------------------------------------------------------------------------------------- MATERIALS -- 0.5% Commodity Chemicals -- 0.1% 196,217 4.25 BB-/B1 Taminco Global Chemical Corp., T ranche B-2 Dollar Term Loan, 2/15/19 $ 198,547 703,607 4.50 NR/Ba2 Tronox, Inc., Closing Date Term Loan, 1/24/17 708,151 -------------- $ 906,698 ---------------------------------------------------------------------------------------------------------- Diversified Chemicals -- 0.1% 1,045,000 4.75 B+/B1 DuPont Performance Coatings, Inc., Initial Term B Loan, 2/1/20 $ 1,060,081 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 72 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Specialty Chemicals -- 0.1% 750,000 5.50 BB+/Ba1 Chemtura Corp., Term Facility, 8/11/16 $ 761,250 947,625 4.50 NR/NR PQ Corp., 2013 Term Loan, 8/7/17 958,878 -------------- $ 1,720,128 ---------------------------------------------------------------------------------------------------------- Metal & Glass Containers -- 0.1% 498,750 4.50 B/B1 BWAY Holding Co., Initial Term Loan, 8/31/17 $ 505,296 ---------------------------------------------------------------------------------------------------------- Paper Packaging -- 0.0%+ 49,125 6.50 B/B2 Exopack Holding Corp., Term Loan B, 5/6/17 $ 49,678 360,180 4.00 BB/Ba1 Sealed Air Corp., Term B-1 Facility, 10/3/18 366,145 -------------- $ 415,823 ---------------------------------------------------------------------------------------------------------- Aluminum -- 0.0%+ 118,800 5.75 B/B1 Noranda Aluminum Holding Corp., Term B Loan, 2/17/19 $ 120,805 ---------------------------------------------------------------------------------------------------------- Diversified Metals & Mining -- 0.1% 996,247 5.25 BB+/Ba1 Fortescue Metals Group, Ltd., Term Loan, 9/18/17 $ 1,009,234 534,863 0.00 B+/B2 Preferred Sands Holding Co. LLC, Term B Loan, 12/15/16 500,097 45,501 4.00 BB+/Ba1 SunCoke Energy, Inc., Tranche B Term Loan, 7/21/18 45,729 -------------- $ 1,555,060 ---------------------------------------------------------------------------------------------------------- Precious Metals & Minerals -- 0.0%+ 438,172 5.25 BB-/B1 Fairmount Minerals, Ltd., Tranche B Term Loan, 3/1/17 $ 441,549 ---------------------------------------------------------------------------------------------------------- Steel -- 0.0%+ 148,487 4.75 BB/B1 JMC Steel Group, Inc., Term Loan, 2/15/17 $ 150,063 -------------- Total Materials $ 6,875,503 ---------------------------------------------------------------------------------------------------------- CAPITAL GOODS -- 0.6% Aerospace & Defense -- 0.1% 489,861 4.75 BBB-/Ba2 AWAS Aviation Capital, Ltd., Term Loan, 6/25/18 $ 494,760 340,000 3.75 BBB-/Ba2 DigitalGlobe, Inc., Term Loan, 1/25/20 344,383 423,938 5.25 B/B1 Sequa Corp., Initial Term Loan, 12/19/17 431,180 346,500 3.75 BBB-/Ba1 Spirit Aerosystems, Inc., Term B Loan, 3/27/19 350,182 -------------- $ 1,620,505 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 73 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Building Products -- 0.1% 463,954 6.00 B+/B2 Custom Building Products, Inc., Term Loan, 12/12/19 $ 472,073 997,500 4.25 B+/B1 Unifrax Corp., New Term B Loan, 12/31/19 1,008,722 -------------- $ 1,480,795 ---------------------------------------------------------------------------------------------------------- Electrical Components & Equipment -- 0.1% 895,500 6.00 BB-/Ba2 WireCo WorldGroup, Inc., Term Loan, 4/13/17 $ 908,932 ---------------------------------------------------------------------------------------------------------- Industrial Conglomerates -- 0.0%+ 700,000 0.00 NR/NR Milacron LLC, Term Loan, 3/12/20 $ 707,000 ---------------------------------------------------------------------------------------------------------- Construction & Farm Machinery & Heavy Trucks -- 0.1% 147,758 4.50 NR/Ba2 Terex Corp., New US Term Loan, 4/28/17 $ 150,011 51,124 4.25 BB/Ba2 The Manitowoc Co., Inc., Term B Loan, 10/11/17 51,795 987,500 5.75 B+/B2 Waupaca Foundry, Inc., Term Loan, 6/29/17 1,002,313 -------------- $ 1,204,119 ---------------------------------------------------------------------------------------------------------- Industrial Machinery -- 0.1% 483,943 4.25 NR/NR Schaeffler AG, Facility C (USD), 1/27/17 $ 489,993 498,747 0.00 BB/Ba3 Trimas Corp., Tranche B Term Loan (2012), 10/11/19 503,111 83,396 6.25 BB-/Ba2 Xerium Technologies, Inc., Initial U.S. Term Loan, 5/26/17 84,021 -------------- $ 1,077,125 ---------------------------------------------------------------------------------------------------------- Trading Companies & Distributors -- 0.1% 1,271,813 4.50 B+/Ba3 WESCO International, Inc., Tranche B-1 Loan, 12/4/19 $ 1,285,961 -------------- Total Capital Goods $ 8,284,437 ---------------------------------------------------------------------------------------------------------- COMMERCIAL SERVICES & SUPPLIES -- 0.3% Environmental & Facilities Services -- 0.1% 198,000 3.50 BB+/Baa3 Covanta Holding Corp., Term Loan, 3/1/19 $ 200,351 100,000 0.00 NR/NR ISS AS, New Term B Loan, 3/26/18 100,594 399,000 3.50 BBB-/Ba1 Progressive Waste Solutions, Ltd., Term B Loan, 10/31/19 405,110 151,507 4.00 B+/B1 Waste Industries USA, Inc., Term B Loan, 2/23/17 153,780 -------------- $ 859,835 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 74 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Office Services & Supplies -- 0.0%+ 96,491 4.25 BB+/Ba1 ACCO Brands Corp., Term B Loan, 1/4/19 $ 97,878 ---------------------------------------------------------------------------------------------------------- Diversified Support Services -- 0.0%+ 498,640 6.25 B/B1 Language Line Services Holdings, Inc., Tranche B Term Loan, 5/30/16 $ 496,355 ---------------------------------------------------------------------------------------------------------- Security & Alarm Services -- 0.1% 521,020 5.25 B+/Ba3 Allied Security Holdings LLC, Term Loan (First Lien), 2/4/17 $ 525,579 748,125 4.50 BB/Ba1 Garda World Security Corp., Term B Loan, 10/24/19 758,646 -------------- $ 1,284,225 ---------------------------------------------------------------------------------------------------------- Human Resource & Employment Services -- 0.1% 601,486 5.00 BB-/Ba3 On Assignment, Inc., Initial Term B Loan, 3/20/19 $ 609,749 -------------- Total Commercial Services & Supplies $ 3,348,042 ---------------------------------------------------------------------------------------------------------- TRANSPORTATION -- 0.1% Airlines -- 0.1% 750,000 5.25 B+/Ba2 Delta Air Lines, Inc., Term B-1 Loan, 9/28/18 $ 762,891 250,000 0.00 BB-/Ba2 United Air Lines, Inc., Class B Term Loan, 3/12/19 253,021 -------------- $ 1,015,912 ---------------------------------------------------------------------------------------------------------- Trucking -- 0.0%+ 180,952 2.95 NR/NR Swift Transportation Co. LLC, Tranche B-1 Term Loan (2013), 12/21/16 $ 182,762 331,509 4.00 NR/NR Swift Transportation Co. LLC, Tranche B-2 Term Loan (2013), 12/21/17 336,689 -------------- $ 519,451 -------------- Total Transportation $ 1,535,363 ---------------------------------------------------------------------------------------------------------- AUTOMOBILES & COMPONENTS -- 0.2% Auto Parts & Equipment -- 0.1% 149,250 4.25 BB-/Ba3 Allison Transmission, Inc., Term B-3 Loan, 8/23/19 $ 151,321 498,750 5.00 B+/B1 Metaldyne Corp., USD Term Loan, 12/19/18 507,478 646,369 0.00 NR/NR TI Group Automotive Systems LLC, 3/27/19 652,832 96,293 3.75 BB/Ba2 Tomkins LLC, Term B-2 Loan, 9/29/16 97,496 -------------- $ 1,409,127 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 75 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Tires & Rubber -- 0.1% 600,000 4.75 BB/Ba1 The Goodyear Tire & Rubber Co., Loan (Second Lien), 3/27/19 $ 607,495 -------------- Total Automobiles & Components $ 2,016,622 ---------------------------------------------------------------------------------------------------------- CONSUMER DURABLES & APPAREL -- 0.4% Home Furnishings -- 0.0%+ 623,438 5.00 BB/Ba3 Tempur-Pedic International, Inc., Term B Loan, 9/27/19 $ 632,956 ---------------------------------------------------------------------------------------------------------- Housewares & Specialties -- 0.1% 151,705 3.75 BB-/Ba2 Prestige Brands, Inc., Term B-1 Loan, 1/31/19 $ 154,132 797,247 4.75 NR/B1 Reynolds Group Holdings, Ltd., U.S. Term Loan, 9/21/18 809,775 252,724 5.25 B+/B1 Yankee Candle Co., Inc., Initial Term Loan, 3/2/19 255,646 -------------- $ 1,219,553 ---------------------------------------------------------------------------------------------------------- Apparel, Accessories & Luxury Goods -- 0.1% 965,000 3.25 BBB-/Ba1 PVH Corp., Tranche B Term Loan, 12/19/19 $ 976,685 ---------------------------------------------------------------------------------------------------------- Footwear -- 0.1% 812,080 4.00 BB/Ba2 Wolverine World Wide, Inc., Tranche B Term Loan, 5/1/19 $ 822,231 ---------------------------------------------------------------------------------------------------------- Textiles -- 0.1% 902,166 5.75 NR/Ba3 Kloeckner Pentaplast SA, Term B-1 Loan, 12/14/16 $ 918,518 -------------- Total Consumer Durables & Apparel $ 4,569,943 ---------------------------------------------------------------------------------------------------------- CONSUMER SERVICES -- 0.5% Casinos & Gaming -- 0.2% 98,492 4.00 BB+/Ba2 Ameristar Casinos, Inc., B Term Loan, 3/29/18 $ 99,431 131,250 6.00 BB-/Ba3 Boyd Gaming Corp., Increased Term Loan, 12/17/15 132,797 1,246,875 4.25 BB/Ba2 MGM Resorts International, Term B Loan, 12/13/19 1,269,364 905,292 3.75 BBB-/Ba1 Penn National Gaming, Inc., Term B Facility Loan, 7/14/18 913,963 188,100 4.00 BB+/Ba1 Pinnacle Entertainment, Inc., Series A Term Loan, 3/5/19 189,746 97,796 3.21 BBB-/Ba1 Scientific Games Corp., Tranche B-1 Term Loan, 6/30/15 98,407 -------------- $ 2,703,708 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 76 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Leisure Facilities -- 0.1% 250,000 5.00 B+/B1 Bombardier Recreational Products, Inc., Term B Loan, 7/17/19 $ 252,786 540,216 4.00 BB+/Ba2 Six Flags Entertainment Corp., Tranche B Term Loan, 11/23/18 545,568 -------------- $ 798,354 ---------------------------------------------------------------------------------------------------------- Restaurants -- 0.2% 245,765 3.75 BB/Ba3 Burger King Corp., Tranche B Term Loan (2012), 9/28/19 $ 249,425 128,283 3.75 BB-/Ba2 DineEquity, Inc., Term B-2 Loan, 10/19/17 130,248 496,241 4.75 B+/B1 Landry's, Inc., B Term Loan, 3/22/18 500,790 157,067 4.50 NR/Ba3 NPC Restaurant Holdings LLC, Term Loan, 12/28/18 159,717 871,622 5.25 B+/Ba3 PF Chang's China Bistro, Inc., Term Borrowing, 7/2/19 883,607 1,049,725 4.75 BB-/B1 Wendy's International, Inc., Term Loan, 4/3/19 1,062,468 -------------- $ 2,986,255 ---------------------------------------------------------------------------------------------------------- Education Services -- 0.0%+ 379,050 4.00 B+/B1 Bright Horizons Family Solutions, Inc., Term B Loan, 1/14/20 $ 382,525 -------------- Total Consumer Services $ 6,870,842 ---------------------------------------------------------------------------------------------------------- MEDIA -- 0.5% Advertising -- 0.1% 498,750 0.00 B+/Ba3 Advantage Sales & Marketing LLC, 2013 Term Loan (First Lien), 12/17/17 $ 506,439 423,938 4.75 B/B1 Getty Images, Inc., New Initial Term Loan, 9/17/19 430,864 -------------- $ 937,303 ---------------------------------------------------------------------------------------------------------- Broadcasting -- 0.2% 247,500 4.00 BB-/Ba2 Cequel Communications Holdings I LLC, Term Loan, 1/31/19 $ 250,149 128,266 5.00 BB-/Ba3 Entercom Communications Corp., Term B Loan, 11/7/18 130,811 746,250 4.00 BB-/Ba3 MCC Georgia LLC, Tranche G Term Loan, 2/8/20 755,578 623,438 4.75 B/B1 NEP Broadcasting LLC, Refinanced New Term Loan (First Lien), 1/3/20 630,451 395,109 0.00 BB+/Ba1 Sinclair Broadcast Group, Inc., New Tranche B Term Loan, 10/29/16 396,835 372,188 0.00 NR/Ba3 Telesat Canada, U.S. Term B Loan, 3/28/19 375,675 347,375 5.75 NR/NR Truven Health Analytics, Inc., New Tranche B Term Loan, 5/23/19 353,454 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 77 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Broadcasting -- (continued) 98,318 3.50 BB-/Ba3 TWCC Holding Corp., Term Loan, 2/11/17 $ 99,813 -------------- $ 2,992,766 ---------------------------------------------------------------------------------------------------------- Cable & Satellite -- 0.1% 371,250 4.00 BB+/Baa3 Charter Communications Operating LLC, Term D Loan, 3/28/19 $ 375,798 650,000 3.25 NR/NR Kabel Deutschland Vertrieb und Service GmbH, Facility F1, 2/1/19 654,120 298,496 6.25 B/B1 WideOpenWest LLC, Term Loan, 4/18/18 302,675 -------------- $ 1,332,593 ---------------------------------------------------------------------------------------------------------- Movies & Entertainment -- 0.1% 569,301 4.75 BB-/Ba2 AMC Entertainment, Inc., Term B-3 Loan, 2/7/18 $ 574,209 494,908 4.50 BB-/Ba2 Live Nation Entertainment, Inc., Term B Loan, 10/20/16 499,440 493,750 5.25 BB-/Ba2 WMG Acquisition Corp., Initial Term Loan, 10/25/18 503,008 -------------- $ 1,576,657 ---------------------------------------------------------------------------------------------------------- Publishing -- 0.0%+ 142,308 0.00 B+/Ba3 Interactive Data Corp., Refinanced Term Loan, 2/11/18 $ 144,131 -------------- Total Media $ 6,983,450 ---------------------------------------------------------------------------------------------------------- RETAILING -- 0.3% Apparel Retail -- 0.0%+ 59,511 5.75 BB/Ba3 Lord & Taylor LLC, Term Loan, 12/2/18 $ 60,230 ---------------------------------------------------------------------------------------------------------- Home Improvement Retail -- 0.1% 1,250,000 4.50 B/B1 Apex Tool Group LLC, Term Loan, 2/1/20 $ 1,269,531 ---------------------------------------------------------------------------------------------------------- Specialty Stores -- 0.1% 1,000,000 3.75 BB-/B1 Michaels Stores, Inc., Term B Loan, 1/16/20 $ 1,012,079 ---------------------------------------------------------------------------------------------------------- Automotive Retail -- 0.1% 548,620 3.75 BB/Ba1 Avis Budget Car Rental LLC, New Tranche B Term Loan, 3/15/19 $ 555,473 498,750 6.25 B+/B1 Sequa Automotive Group, Term Loan, 11/1/18 504,257 748,125 3.75 BB/NR The Hertz Corp., Tranche B1 Term Loan, 3/11/18 759,502 -------------- $ 1,819,232 -------------- Total Retailing $ 4,161,072 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 78 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- FOOD & STAPLES RETAILING -- 0.1% Food Distributors -- 0.0%+ 249,375 5.75 B/B1 AdvancePierre Foods, Term Loan (First Lien), 6/17/17 $ 253,427 ---------------------------------------------------------------------------------------------------------- Food Retail -- 0.1% 625,000 5.75 NR/NR Albertsons LLC, Term B Loan, 2/14/16 $ 636,440 -------------- Total Food & Staples Retailing $ 889,867 ---------------------------------------------------------------------------------------------------------- FOOD, BEVERAGE & TOBACCO -- 0.4% Packaged Foods & Meats -- 0.4% 498,750 5.00 B+/NR Acosta, Inc., Term D Loan, 9/25/17 $ 505,608 74,063 4.00 BB/Ba1 B&G Foods, Inc., Tranche B Term Loan (2012), 11/30/18 75,220 498,750 4.00 B/B1 Del Monte Foods Co., Initial Term Loan, 2/3/18 503,686 1,600,000 0.00 BB-/NR HJ Heinz Co., Term B2 Loan, 3/27/20 1,615,664 997,500 3.75 NR/Ba2 JBS USA LLC, Initial Term Loan, 5/25/18 1,006,228 1,042,985 4.75 B+/Ba3 Pinnacle Foods Finance LLC, Tranche E Term Loan, 9/16/18 1,053,974 -------------- $ 4,760,380 -------------- Total Food, Beverage & Tobacco $ 4,760,380 ---------------------------------------------------------------------------------------------------------- HOUSEHOLD & PERSONAL PRODUCTS -- 0.0%+ Personal Products -- 0.0%+ 173,251 0.00 NR/NR Monotronics International, Inc., Term B Loan, 3/23/18 $ 171,518 426,136 4.00 B+/Ba2 Revlon Consumer Products Corp., Replacement Term Loan, 11/19/17 433,327 -------------- $ 604,845 -------------- Total Household & Personal Products $ 604,845 ---------------------------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 0.8% Health Care Equipment -- 0.1% 1,144,250 4.50 BBB-/Ba2 Hologic, Inc., Tranche B Term Loan, 4/29/19 $ 1,161,533 371,062 5.50 BB-/Ba2 Kinetic Concepts, Inc., Dollar Term C-1 Loan, 5/4/18 378,251 -------------- $ 1,539,784 ---------------------------------------------------------------------------------------------------------- Health Care Supplies -- 0.0%+ 221,640 5.00 BB-/Ba3 Immucor, Inc., Term B-2 Loan, 8/19/18 $ 223,684 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 79 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Health Care Services -- 0.3% 600,000 5.00 B+/Ba3 BSN Medical GmbH & Co. KG, Facility B1A, 8/28/19 $ 607,000 748,125 4.00 BB-/Ba2 DaVita, Inc., Tranche B2 Term Loan, 8/1/19 756,834 1,271,762 4.00 B+/Ba3 Emergency Medical Services Corp., Initial Term Loan, 4/5/18 1,279,393 66,656 7.75 B/B2 inVentiv Health, Inc., Term B-3 Loan, 6/24/18 66,239 746,292 6.75 B+/Ba3 MModal, Inc., Term B Loan, 8/17/19 719,705 -------------- $ 3,429,171 ---------------------------------------------------------------------------------------------------------- Health Care Facilities -- 0.3% 72,924 0.00 BB-/Ba3 Health Management Associates, Inc., Replacement Term B Loan, 11/18/18 $ 73,621 496,225 4.50 NR/NR IASIS Healthcare LLC, Term B-2 Loan, 5/3/18 503,823 723,188 5.25 B+/Ba3 Kindred Healthcare, Inc., Incremental Term Loan, 6/1/18 730,871 498,750 2.71 BB-/Ba1 LifePoint Hospitals, Inc., Incremental Term Loan B, 7/24/17 502,802 498,750 7.00 NR/NR RegionalCare Hospital Partners, Inc., Term Loan (First Lien 2013), 11/4/18 507,478 992,500 5.50 B+/B1 Select Medical Corp., Series A Tranche B Term Loan, 6/1/18 998,703 98,250 5.50 B+/B1 Select Medical Holdings Corp., Tranche B Term Loan, 4/25/18 99,232 -------------- $ 3,416,530 ---------------------------------------------------------------------------------------------------------- Health Care Technology -- 0.1% 750,000 5.00 B+/Ba3 Convatec, Inc., Dollar Term Loan, 12/1/16 $ 763,360 644,430 5.00 BB-/Ba3 Emdeon, Inc., Term B-1 Loan, 11/2/18 653,896 -------------- $ 1,417,256 -------------- Total Health Care Equipment & Services $ 10,026,425 ---------------------------------------------------------------------------------------------------------- PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 0.4% Biotechnology -- 0.2% 945,250 3.50 BB/B1 Alkermes, Inc., 2019 Term Loan, 9/25/19 $ 950,370 97,995 5.50 BB/B2 Axcan Intermediate Holdings, Inc., Term B-1 Loan, 2/11/17 98,975 815,191 4.25 BB+/Ba2 Grifols, Inc., New U.S. Tranche B Term Loan, 6/4/17 824,725 154,263 4.25 BBB-/Ba3 Warner Chilcott Corp., Additional Term B-1 Loan, 3/15/18 156,577 354,376 4.25 BBB-/Ba3 Warner Chilcott Corp., Term B-1 Loan, 3/3/18 359,692 The accompanying notes are an integral part of these financial statements. 80 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Biotechnology -- (continued) 125,573 4.25 BBB-/Ba3 Warner Chilcott Corp., Term B-2 Loan, 3/17/18 $ 127,457 279,253 4.25 BBB-/Ba3 WC Luxco Sarl, Term B-3 Loan, 3/3/18 283,442 -------------- $ 2,801,238 ---------------------------------------------------------------------------------------------------------- Pharmaceuticals -- 0.2% 8,650 4.00 BBB-/Baa3 Endo Health Solutions, Inc., Term Loan B 2011, 6/18/18 $ 8,713 746,255 4.25 B+/B1 Par Pharmaceutical Companies, Inc., Additional Term B-1 Loan, 9/28/19 755,502 541,957 3.50 BBB-/Baa2 RPI Finance Trust, 6.75 Year Term Loan (2012), 5/10/18 548,280 643,584 4.00 BBB-/Baa2 RPI Finance Trust, New Term Loan, 11/9/18 648,411 598,500 3.50 NR/NR Valeant Pharmaceuticals International, Inc., Series C-1 Tranche B Term Loan, 12/11/19 604,407 249,375 3.50 BBB-/Ba1 Valeant Pharmaceuticals International, Inc., Series D-1 Tranche B Term Loan, 2/13/19 251,930 -------------- $ 12,817,243 -------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 5,618,481 ---------------------------------------------------------------------------------------------------------- BANKS -- 0.1% Thrifts & Mortgage Finance -- 0.1% 1,225,000 5.00 B/B1 Ocwen Financial Corp., Initial Term Loan, 1/15/18 $ 1,246,438 -------------- Total Banks $ 1,246,438 ---------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 0.2% Other Diversified Financial Services -- 0.1% 1,226,772 5.75 NR/B1 Fly Funding II Sarl, Term Loan, 8/9/18 $ 1,243,640 98,939 5.25 BB/Ba3 WorldPay, Facility B2A Term Loan, 8/6/17 99,607 -------------- $ 1,343,247 ---------------------------------------------------------------------------------------------------------- Specialized Finance -- 0.1% 773,063 5.25 B/NR DH Services Luxembourg Sarl, Term Loan, 12/18/19 $ 780,954 500,000 0.00 BB-/B1 ROC Finance LLC, New Term Loan B, 3/27/19 503,440 -------------- $ 1,284,394 -------------- Total Diversified Financials $ 2,627,641 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 81 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- INSURANCE -- 0.1% Life & Health Insurance -- 0.0% 477,883 5.00 NR/Ba3 CNO Financial Group, Inc., Tranche B2 Term Loan, 9/4/18 $ 485,947 ---------------------------------------------------------------------------------------------------------- Multi-line Insurance -- 0.0%+ 249,375 5.00 B-/B1 Alliant Insurance Services, Inc., Initial Term Loan, 12/7/19 $ 252,414 ---------------------------------------------------------------------------------------------------------- Property & Casualty Insurance -- 0.1% 1,107,225 5.25 B-/B1 USI Insurance Services LLC, Initial Term Loan, 11/29/19 $ 1,118,759 -------------- Total Insurance $ 1,857,120 ---------------------------------------------------------------------------------------------------------- REAL ESTATE -- 0.0%+ Real Estate Services -- 0.0%+ 498,750 5.75 BB-/B1 Altisource Portfolio Solutions SA, Term B Loan, 11/1/19 $ 508,102 -------------- Total Real Estate $ 508,102 ---------------------------------------------------------------------------------------------------------- SOFTWARE & SERVICES -- 0.2% IT Consulting & Other Services -- 0.1% 995,000 4.50 BB/Ba3 Booz Allen Hamilton Holding Corp., Initial Tranche B Term Loan, 7/10/19 $ 1,010,422 ---------------------------------------------------------------------------------------------------------- Data Processing & Outsourced Services -- 0.1% 995,000 4.25 BB+/Ba2 Genpact, Ltd., Term Loan, 8/17/19 $ 1,010,754 171,586 4.25 BB/Ba3 VeriFone Systems, Inc., Term B Loan, 11/14/18 172,373 -------------- $ 1,183,127 ---------------------------------------------------------------------------------------------------------- APPLICATION SOFTWARE -- 0.0%+ 247,688 8.50 B/Ba3 Expert Global Solutions, Inc., Term B Advance (First Lien), 3/13/18 $ 250,165 ---------------------------------------------------------------------------------------------------------- Systems Software -- 0.0%+ 619,659 4.00 NR/Ba2 Rovi Corp., Tranche B2 Term Loan, 3/30/19 $ 619,659 -------------- Total Software & Services $ 3,063,373 ---------------------------------------------------------------------------------------------------------- TECHNOLOGY HARDWARE & EQUIPMENT -- 0.2% Communications Equipment -- 0.2% 497,500 6.75 B+/B1 Audio Visual Services Corp., Term Loan (First Lien), 10/11/18 $ 501,231 248,101 3.75 BB/Ba3 CommScope, Inc., Tranche 2 Term Loan, 1/14/18 250,889 1,689,080 4.00 BBB-/Ba3 Riverbed Technology, Inc., Term Loan, 10/29/19 1,710,193 -------------- $ 2,462,313 -------------- Total Technology Hardware & Equipment $ 2,462,313 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 82 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- SEMICONDUCTORS & SEMICONDUCTOR EQUIPMENT -- 0.1% Semiconductor Equipment -- 0.0%+ 131,559 5.75 BB-/B1 Aeroflex, Inc., Tranche B Term Loan, 4/25/18 $ 134,135 98,250 3.75 BBB-/Ba2 Sensata Technologies BV, Term Loan, 4/29/18 99,550 -------------- $ 233,685 ---------------------------------------------------------------------------------------------------------- Semiconductors -- 0.1% 295,301 3.75 BB/Ba2 Microsemi Corp., Term Loan, 2/2/18 $ 297,959 486,325 4.25 BBB-/Ba2 Semtech Corp., B Term Loan, 2/21/17 492,404 -------------- $ 790,363 -------------- Total Semiconductors & Semiconductor Equipment $ 1,024,048 ---------------------------------------------------------------------------------------------------------- TELECOMMUNICATION SERVICES -- 0.6% Integrated Telecommunication Services -- 0.5% 750,000 0.00 B+/B1 Hargray Communications Group, Inc., 1st Lien Term Loan, 6/29/14 $ 752,812 748,005 0.00 BB+/Baa3 tw telecom holdings, inc., Term B2 Loan, 12/30/16 753,615 2,205,000 0.00 NR/NR Virgin Media Investment Holdings, Ltd., 2/6/20 2,196,731 1,158,589 4.25 B+/Ba3 West Corp., Term B-8 Loan, 6/30/18 1,178,864 719,563 4.00 BB+/Baa3 Windstream Corp., Tranche B-3 Term Loan, 7/23/19 728,557 748,125 3.50 BB+/Baa3 Windstream Corp., Tranche B-4 Term Loan, 1/8/20 756,541 -------------- $ 6,367,120 ---------------------------------------------------------------------------------------------------------- Wireless Telecommunication Services -- 0.1% 123,125 4.50 NR/NR Cellular South, Inc., Term Loan, 7/27/17 $ 124,664 123,438 4.00 B+/Ba2 Crown Castle International Corp., Tranche B Term Loan, 1/10/19 125,042 750,000 0.00 BB-/B1 Syniverse Holdings, Inc., Initial Term Loan (2013), 4/23/19 751,875 -------------- $ 1,001,581 -------------- Total Telecommunication Services $ 7,368,701 ---------------------------------------------------------------------------------------------------------- UTILITIES -- 0.3% Independent Power Producers & Energy Traders -- 0.3% 270,628 5.00 BB+/NR AES Corp. Virginia, 2013 Other Term Loan, 5/27/18 $ 274,814 772,500 4.00 BB-/B1 Calpine Corp., Term Loan, 9/27/19 779,662 891,189 3.25 NR/NR NRG Energy, Inc., 2013 Term Loan, 7/1/18 904,446 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 83 Schedule of Investments | 3/31/13 (continued) ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Independent Power Producers & Energy Traders -- (continued) 1,381,538 4.75 BB+/Ba1 NSG Holdings LLC, New Term Loan, 11/15/19 $ 1,405,714 900,000 0.00 BB+/Ba2 Ruby Western Pipeline Holdings LLC, Term Loan, 3/27/20 912,375 -------------- $ 4,277,011 -------------- Total Utilities $ 4,277,011 ---------------------------------------------------------------------------------------------------------- TOTAL SENIOR FLOATING RATE LOAN INTERESTS (Cost $92,007,372) $ 93,444,072 ---------------------------------------------------------------------------------------------------------- TEMPORARY CASH INVESTMENTS -- 6.6% Certificates of Deposit -- 3.0% 950,000 0.56 NR/NR Bank of Nova Scotia Houston, Floating Rate Note, 1/3/14 $ 951,647 2,500,000 0.55 NR/NR Bank of Nova Scotia Houston, Floating Rate Note, 7/19/13 2,502,175 3,000,000 0.63 NR/NR Bank of Nova Scotia Houston, Floating Rate Note, 9/17/13 3,006,525 2,000,000 1.03 AA-/Aa2 Commonwealth Bank of Australia New York NY, Floating Rate Note, 6/14/13 2,004,466 6,490,000 NR/NR National Australia Funding Delaware, Inc., 0.0%, 4/1/13 (c) 6,490,000 6,455,000 BBB+/A3 Nissan Motor Acceptance Corp., 0.0%, 4/5/13 (c) 6,454,785 1,000,000 0.77 AA-/Aa3 Nordea Bank Finland Plc New York, Floating Rate Note, 1/27/14 1,003,803 300,000 0.74 AA-/NR Nordea Bank Finland Plc New York, Floating Rate Note, 4/5/13 300,014 600,000 0.53 NR/NR Royal Bank of Canada New York NY, Floating Rate Note, 5/29/13 600,352 1,550,000 0.49 AA-/Aa3 Royal Bank of Canada New York NY, Floating Rate Note, 9/3/13 1,551,993 3,450,000 1.10 NR/NR Svenska Handelsbanken New York NY, Floating Rate Note, 7/17/14 3,458,880 2,000,000 0.30 NR/NR Toronto-Dominion Bank New York, Floating Rate Note, 10/21/13 2,000,468 750,000 0.29 NR/NR Toronto-Dominion Bank New York, Floating Rate Note, 5/15/13 750,000 7,000,000 BBB+/Baa2 Tyco Electronics Group SA, 0.0%, 4/1/13 (c) 7,000,000 1,500,000 0.19 NR/NR Wells Fargo Bank NA, Floating Rate Note, 9/13/13 1,499,329 250,000 1.06 NR/NR Westpac Banking Corp. New York, Floating Rate Note, 7/10/13 250,553 -------------- $ 39,824,990 ---------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 84 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ---------------------------------------------------------------------------------------------------------- Repurchase Agreements -- 3.6% 20,465,000 NR/Aaa Bank of Nova Scotia, Inc., 0.19%, dated 3/28/13, repurchase price of $20,465,000 plus accrued interest on 4/1/13 collateralized by $20,874,411 Freddie Mac Giant, 3.5%, 6/1/42 $ 20,465,000 27,265,000 NR/Aaa Deutschebank AG, 0.15%, dated 3/28/13, repurchase price of $20,465,000 plus accrued interest on 4/1/13 collateralized by $27,810,319 U.S. Treasury Strip, 0.0-2.625%, 8/15/13-2/15/35 27,265,000 -------------- $ 47,730,000 ---------------------------------------------------------------------------------------------------------- TOTAL TEMPORARY CASH INVESTMENTS (Cost $87,566,906) $ 87,554,990 ---------------------------------------------------------------------------------------------------------- TOTAL INVESTMENT IN SECURITIES -- 99.8% (Cost $1,308,858,089) (a) $1,315,882,975 ---------------------------------------------------------------------------------------------------------- OTHER ASSETS & LIABILITIES -- 0.2% $ 5,040,961 ---------------------------------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $1,320,923,936 ========================================================================================================== NR Not rated by either S&P or Moody's. WR Withdrawn rating. REIT Real Estate Investment Trust. REMIC Real Estate Mortgage Investment Conduits. (Cat Bond) Catastrophe bond is a high-yield debt instrument that is usually insurance linked and meant to raise money in case of a catastrophe. (Step) Bond issued with an initial coupon rate which converts to a higher rate at a later date. + Rounds to less than 0.1%. (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 March 31, 2013, the value of these securities amounted to $321,391,005 or 24.3% 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 United States banks, (iii) the rate of a 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 Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 85 Schedule of Investments | 3/31/13 (continued) (a) At March 31, 2013, the net unrealized appreciation on investments based on cost for federal income tax purposes of $1,311,372,172 was as follows: Aggregate gross unrealized appreciation for all investments in which there is an excess of value over tax cost $ 7,577,038 Aggregate gross unrealized depreciation for all investments in which there is an excess of tax cost over value (3,066,235) ------------ Net unrealized appreciation $ 4,510,803 ============ (b) Debt obligation with a variable interest rate. Rate shown is rate at end of period. (c) Security issued with a zero coupon. Income is recognized through accretion of discount. Purchases and sales of securities (excluding temporary cash investments) for the year ended March 31, 2013 aggregated $1,469,230,087 and $638,780,975, respectively. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. Level 1 - quoted prices in active markets for identical securities. Level 2 - other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.) See Notes to Financial Statements -- Note 1A. Level 3 - significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) See Notes to Financial Statements -- Note 1A. 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 following is a summary of the inputs used as of March 31, 2013, in valuing the Fund's investments: ----------------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total ----------------------------------------------------------------------------------------- Asset Backed Securities $ -- $ 323,879,465 $ -- $ 323,879,465 Collateralized Mortgage Obligations -- 411,874,759 -- 411,874,759 Corporate Bonds -- 254,367,072 -- 254,367,072 U.S. Government and Agency Obligations -- 100,608,404 -- 100,608,404 Municipal Bonds -- 44,154,213 -- 44,154,213 Senior Floating Rate Loan Interests -- 93,444,072 -- 93,444,072 Certificates of Deposit -- 39,824,990 -- 39,824,990 Repurchase Agreements -- 47,730,000 -- 47,730,000 ----------------------------------------------------------------------------------------- Total $ -- $1,315,882,975 $ -- $1,315,882,975 ========================================================================================= During the year ended March 31, 2013, there were no transfers between Levels 1, 2 and 3. The accompanying notes are an integral part of these financial statements. 86 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 Statement of Assets and Liabilities | 3/31/13 ASSETS: Investment in securities (cost $1,308,858,089) $1,315,882,975 Cash 11,080,973 Receivables -- Investment securities sold 257,642 Fund shares sold 39,571,345 Interest 2,478,844 Other 109,287 ------------------------------------------------------------------------------------- Total assets $1,382,136,066 ------------------------------------------------------------------------------------- LIABILITIES: Payables -- Investment securities purchased $ 40,295,471 Fund shares repurchased 7,385,301 Dividends 341,814 Due to affiliates 218,537 Accrued expenses 216,007 ------------------------------------------------------------------------------------- Total liabilities $ 61,212,130 ------------------------------------------------------------------------------------- NET ASSETS: Paid-in capital $1,317,370,172 Distributions in excess of net investment income (2,855,856) Accumulated net realized loss on investments and futures contracts (615,266) Net unrealized appreciation on investments 7,024,886 ------------------------------------------------------------------------------------- Total net assets $1,320,923,936 ===================================================================================== NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Class A (based on $381,267,133/37,817,039 shares) $ 10.08 Class C (based on $330,828,383/32,849,981 shares) $ 10.07 Class K (based on $9,993/991 shares) $ 10.08 Class Y (based on $608,818,427/60,345,503 shares) $ 10.09 MAXIMUM OFFERING PRICE: Class A ($10.08 (divided by) 97.5%) $ 10.34 ===================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 87 Statement of Operations For the Year Ended 3/31/13 INVESTMENT INCOME: Interest $11,472,152 ------------------------------------------------------------------------------------------------ Total investment income $ 11,472,152 ------------------------------------------------------------------------------------------------ EXPENSES: Management fees $ 2,380,391 Transfer agent fees and expenses Class A 18,869 Class C 15,061 Class Y 7,292 Distribution fees Class A 396,625 Class C 724,251 Shareholder communication expense 354,773 Administrative reimbursement 206,972 Custodian fees 133,643 Registration fees 185,311 Professional fees 110,285 Printing expense 55,075 Fees and expenses of nonaffiliated Trustees 22,515 Miscellaneous 197,088 ------------------------------------------------------------------------------------------------ Total expenses $ 4,808,151 ------------------------------------------------------------------------------------------------ Net investment income $ 6,664,001 ------------------------------------------------------------------------------------------------ REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS AND FUTURES CONTRACTS: Net realized gain (loss) on: Investments $ 59,045 Futures contracts (1,251) $ 57,794 ------------------------------------------------------------------------------------------------ Change in net unrealized appreciation (depreciation) on: Investments $ 6,603,867 Futures contracts (688) $ 6,603,179 ------------------------------------------------------------------------------------------------ Net gain on investments and futures contracts $ 6,660,973 ------------------------------------------------------------------------------------------------ Net increase in net assets resulting from operations $ 13,324,974 ================================================================================================ The accompanying notes are an integral part of these financial statements. 88 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 Statements of Changes in Net Assets --------------------------------------------------------------------------------------------------- 5/2/11 (Commencement Year Ended of Operations) 3/31/13 to 3/31/12 --------------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income $ 6,664,001 $ 846,905 Net realized gain (loss) on investments, futures contracts, and foreign currency transactions 57,794 (7,898) Change in net unrealized appreciation on investments, futures contracts, and foreign currency transactions 6,603,179 421,707 --------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 13,324,974 $ 1,260,714 --------------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Net investment income: Class A ($0.15 and $0.13 per share, respectively) $ (2,922,161) $ (293,801) Class C ($0.11 and $0.06 per share, respectively) (1,648,303) (54,609) Class K ($0.05 and $0.00 per share, respectively) (54) -- Class Y ($0.17 and $0.15 per share, respectively) (5,907,023) (583,991) --------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (10,477,541) $ (932,401) --------------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sale of shares $1,778,506,536 $202,547,654 Reinvestment of distributions 8,481,507 542,255 Cost of shares repurchased (628,246,664) (44,083,098) --------------------------------------------------------------------------------------------------- Net increase in net assets resulting from Fund share transactions $1,158,741,379 $159,006,811 --------------------------------------------------------------------------------------------------- Net increase in net assets $1,161,588,812 $159,335,124 NET ASSETS: Beginning of period 159,335,124 -- --------------------------------------------------------------------------------------------------- End of period $1,320,923,936 $159,335,124 --------------------------------------------------------------------------------------------------- Distributions in excess of net investment income $ (2,855,856) $ (77,816) --------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 89 Statements of Changes in Net Assets (continued) ---------------------------------------------------------------------------------------------- '13 Shares '13 Amount '12 Shares '12 Amount ---------------------------------------------------------------------------------------------- Class A Shares sold 51,554,654 $ 519,046,315 5,368,452 $ 52,712,709 Reinvestment of distributions 267,063 2,690,174 23,987 239,674 Less shares repurchased (18,809,955) (189,556,502) (587,162) (5,869,255) ---------------------------------------------------------------------------------------------- Net increase 33,011,762 $ 332,179,987 4,805,277 $ 47,083,128 ============================================================================================== Class C Shares sold 43,411,358 $ 436,864,772 1,684,145 $ 15,038,604 Reinvestment of distributions 154,379 1,554,742 3,580 35,733 Less shares repurchased (11,878,112) (119,597,629) (525,369) (5,240,717) ---------------------------------------------------------------------------------------------- Net increase 31,687,625 $ 318,821,885 1,162,356 $ 9,833,620 ============================================================================================== Class K* Shares sold 991 $ 10,000 -- $ -- Reinvestment of distributions -- -- -- -- Less shares repurchased -- -- -- -- ---------------------------------------------------------------------------------------------- Net increase 991 $ 10,000 -- $ -- ============================================================================================== Class Y Shares sold 81,639,780 $ 822,585,449 13,195,493 $ 134,796,341 Reinvestment of distributions 420,137 4,236,591 26,678 266,848 Less shares repurchased (31,638,154) (319,092,533) (3,298,431) (32,973,126) ---------------------------------------------------------------------------------------------- Net increase 50,421,763 $ 507,729,507 9,923,740 $ 102,090,063 ============================================================================================== * Class K shares were first publicly offered on December 20, 2012. The accompanying notes are an integral part of these financial statements. 90 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 Financial Highlights ----------------------------------------------------------------------------------------------------------- 5/2/11 (Commencement Year Ended of Operations) 3/31/13 to 3/31/12 (a) ----------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of period $ 10.02 $ 10.00 ----------------------------------------------------------------------------------------------------------- Increase from investment operations: Net investment income $ 0.13 $ 0.12 Net realized and unrealized gain on investments 0.08 0.03 ----------------------------------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 0.21 $ 0.15 ----------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.15) (0.13) ----------------------------------------------------------------------------------------------------------- Net increase in net asset value $ 0.06 $ 0.02 ----------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.08 $ 10.02 =========================================================================================================== Total return* 2.14% 1.48%(b) Ratio of net expenses to average net assets 0.72% 0.90% ** Ratio of net investment income to average net assets 0.94% 1.45%** Portfolio turnover rate 101% 51%** Net assets, end of period (in thousands) $381,267 $48,160 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Total expenses 0.72% 1.03%** Net investment income 0.94% 1.32%** Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.72% 0.90%** Net investment income 0.94% 1.45%** =========================================================================================================== (a) Class A shares were first publicly offered on May 2, 2011. (b) Not annualized. * 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. The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 91 Financial Highlights (continued) ----------------------------------------------------------------------------------------------------------- 5/2/11 (Commencement Year Ended of Operations) 3/31/13 to 3/31/12 (a) ----------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of period $ 10.02 $ 10.00 ----------------------------------------------------------------------------------------------------------- Increase from investment operations: Net investment income $ 0.09 $ 0.05 Net realized and unrealized gain on investments 0.07 0.03 ----------------------------------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 0.16 $ 0.08 ----------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.11) (0.06) ----------------------------------------------------------------------------------------------------------- Net increase in net asset value $ 0.05 $ 0.02 ----------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.07 $ 10.02 =========================================================================================================== Total return* 1.61% 0.82%(b) Ratio of net expenses to average net assets 1.03% 1.75%** Ratio of net investment income to average net assets 0.63% 0.52%** Portfolio turnover rate 101% 51%** Net assets, end of period (in thousands) $330,828 $11,643 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Total expenses 1.03% 1.87%** Net investment income 0.63% 0.40%** Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.03% 1.75%** Net investment income 0.63% 0.52%** =========================================================================================================== (a) Class C shares were first publicly offered on May 2, 2011. (b) Not annualized. * 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. The accompanying notes are an integral part of these financial statements. 92 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------- 12/20/12 (Commencement of Operations) to 3/31/13 (a) ---------------------------------------------------------------------------------- Class K Net asset value, beginning of period $ 10.09 ---------------------------------------------------------------------------------- Increase from investment operations: Net investment income $ 0.03 Net realized and unrealized gain on investments 0.01 ---------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 0.04 ---------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.05) ---------------------------------------------------------------------------------- Net decrease in net asset value $ (0.01) ---------------------------------------------------------------------------------- Net asset value, end of period $ 10.08 ================================================================================== Total return* 0.43%(b) Ratio of net expenses to average net assets 0.53%** Ratio of net investment income to average net assets 1.25%** Portfolio turnover rate 101%** Net assets, end of period (in thousands) $ 10 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Total expenses 0.53%** Net investment income 1.25%** Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.53%** Net investment income 1.25%** ================================================================================== (a) Class K shares were first publicly offered on December 20, 2012. (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. The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 93 Financial Highlights (continued) ---------------------------------------------------------------------------------------- 5/2/11 (Commencement Year Ended of Operations) 3/31/13 to 3/31/12 (a) ---------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 10.03 $ 10.00 ---------------------------------------------------------------------------------------- Increase from investment operations: Net investment income $ 0.14 $ 0.14 Net realized and unrealized gain on investments 0.09 0.04 ---------------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 0.23 $ 0.18 ---------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.17) (0.15) ---------------------------------------------------------------------------------------- Net increase in net asset value $ 0.06 $ 0.03 ---------------------------------------------------------------------------------------- Net asset value, end of period $ 10.09 $ 10.03 ======================================================================================== Total return* 2.35% 1.79%(b) Ratio of net expenses to average net assets 0.55% 0.67%** Ratio of net investment income to average net assets 1.11% 1.72%** Portfolio turnover rate 101% 51%** Net assets, end of period (in thousands) $608,818 $99,533 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Total expenses 0.55% 0.80%** Net investment income 1.11% 1.59%** Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.55% 0.67%** Net investment income 1.11% 1.72%** ======================================================================================== (a) Class Y shares were first publicly offered on May 2, 2011. (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. The accompanying notes are an integral part of these financial statements. 94 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 Notes to Financial Statements | 3/31/13 1. Organization and Significant Accounting Policies Pioneer Multi-Asset Ultrashort Income Fund (formerly known as Pioneer Multi-Asset Floating Rate Fund) (the Fund) is one of three portfolios comprising Pioneer Series Trust X, a Delaware statutory trust. The Fund is registered under the Investment Company Act of 1940 as a diversified, open-end management investment company. The investment objective of the Fund is to seek a high level of current income to the extent consistent with a relatively high level of stability of principal. The Fund offers five classes of shares designated as Class A, Class C, Class K, Class Y and Class Z shares. Class A, Class C and Class Y shares were first publicly offered on May 2, 2011. Class K shares were first publicly offered on December 20, 2012. Class Z shares are offered effective April 1, 2013. 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 K or Class Y shares. 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. 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: Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 95 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. Short-term fixed income securities with remaining maturities of sixty days or less generally are valued at amortized cost. Shares of money market mutual funds are valued at their 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 by or at the direction or with the approval of the Valuation Committee using fair value methods pursuant to procedures adopted by the Board of Trustees. The Valuation Committee is comprised of certain members of 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 significantly from exchange prices and such differences could be material. Pioneer Investment Management, Inc. (PIM) is responsible for monitoring developments that may impact fair valued securities and for discussing and assessing fair values on an ongoing basis, and at least quarterly, with the Valuation Committee. At March 31, 2013, no securities were valued using fair value methods (other than securities valued using prices supplied by independent pricing services). Inputs used when applying fair value methods to value a security may include credit ratings, the financial condition of the company, current market conditions and comparable securities. 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. 96 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 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. Interest income, including interest on income bearing cash accounts, is recorded on the accrual basis, net of unrecoverable foreign taxes withheld at the applicable country rates. Gains and losses on sales of investments are calculated on the identified cost method for both financial reporting and federal income tax purposes. B. Foreign Currency Translation The books and records of the Fund are maintained in U.S. dollars. Amounts denominated in foreign currencies are translated into U.S. dollars using current exchange rates. Net realized gains and losses on foreign currency transactions, if any, represent, among other things, the net realized gains and losses on foreign currency contracts, disposition of foreign currencies and the difference between the amount of income accrued and the U.S. dollars actually received. Further, the effects of changes in foreign currency exchange rates on investments are not segregated in the statement of operations from the effects of changes in market price of those securities but are included with the net realized and unrealized appreciation or depreciation on investments. C. Forward Foreign Currency Contracts The Fund may enter into forward foreign currency contracts (contracts) for the purchase or sale of a specific foreign currency at a fixed price on a future date. All contracts are marked to market daily at the applicable exchange rates, and any resulting unrealized appreciation or depreciation are recorded in the Fund's financial statements. The Fund records realized gain and loss at the time a portfolio hedge is offset by entry into a closing transaction or extinguished by delivery of the currency. Risks may arise upon entering into these contracts from the potential inability of counterparties to meet the terms of the contract and from unanticipated movements in the value of foreign currencies relative to the U.S. dollar. D. 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 provision for federal income taxes is required. As of March 31, 2013, the Fund did not have any interest and penalties related to uncertain tax positions, which, if applicable, would be recorded as an income tax expense in the Statement of Operations. Tax years for the prior three fiscal years are subject to examination by Federal and State tax authorities. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 97 The amount and character of income and capital gain distributions to shareowners are determined in accordance with federal income tax rules, which may differ from U.S. generally accepted accounting principles. Distributions in excess of net investment income or net realized gains are temporary overdistributions for financial statement purposes resulting from differences in the recognition or classification of income or distributions for financial statement and tax purposes. Capital accounts within the financial statements are adjusted for permanent book/tax differences to reflect tax character, but are not adjusted for temporary differences. At March 31, 2013, the Fund reclassified $363,156 to decrease paid-in capital, $1,035,500 to decrease distributions in excess of net investment income, and $672,344 to increase accumulated net realized loss on investments to reflect permanent book/tax differences. These adjustments have no impact on net assets or the results of operations. The Fund has elected to defer $615,225 of capital losses recognized between November 1, 2012 and March 31, 2013 to its fiscal year ending March 31, 2014. The tax character of distributions paid during the years ended March 31, 2013 and March 31, 2012 was as follows: ------------------------------------------------------------------------- 2013 2012 ------------------------------------------------------------------------- Distributions paid from: Ordinary income $10,477,541 $ 932,401 ------------------------------------------------------------------------- Total $10,477,541 $ 932,401 ========================================================================= The following shows the components of distributable earnings on a federal income tax basis at March 31, 2013: ------------------------------------------------------------------------- 2013 ------------------------------------------------------------------------- Distributable earnings: Post-October loss deferred $ (615,225) Dividends payable (341,814) Net unrealized appreciation 4,510,803 ------------------------------------------------------------------------- Total $3,553,764 ========================================================================= 98 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 The difference between book-basis and tax-basis net unrealized appreciation is attributable to the tax deferral of losses on wash sales, adjustments relating to catastrophe bonds and the tax treatment of premium and amortization. E. 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 $22,668 in underwriting commissions on the sale of Class A shares during the year ended March 31, 2013. F. Class Allocations Income, common expenses, and realized and unrealized appreciation and depreciation are calculated at the Fund level and allocated daily to each class of shares based on its respective percentage of adjusted net assets at the beginning of the day. Distribution fees are calculated based on the average daily net asset value attributable to Class A and Class C shares of the Fund, respectively (see Note 4). Class K and Class Y shares do not pay distribution fees. All expenses and fees paid to the transfer agent, Pioneer Investment Management Shareholder Services, Inc. (PIMSS), for its services are allocated among the classes of shares based on the number of accounts in each class and the ratable allocation of related out-of-pocket expenses (see Note 3). The Fund declares as daily dividends substantially all of its net investment income. All dividends are paid on a monthly basis. Short-term capital gain distributions, if any, may be declared with the daily dividends. Distributions to shareowners are recorded as of the ex-dividend date. Distributions paid by the Fund with respect to each class of shares are calculated in the same manner and at the same time except that net investment income dividends to Class A, Class C, Class K and Class Y shares can reflect different transfer agent and distribution expense rates. G. Risks When interest rates rise, the prices of fixed-income securities in the Fund will generally fall. Conversely, when interest rates fall, the prices of fixed-income securities in the Fund will generally rise. Investments in the Fund are subject to possible loss due to the financial failure of issuers of underlying securities and the issuers' inability to meet their debt obligations. 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. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 99 H. Futures Contracts The Fund may enter into futures transactions to hedge against changes in interest rates, securities prices and currency 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 appreciation or depreciation. 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 fluctuations in foreign currency exchange rates where applicable. The use of futures contracts involves, to varying degrees, elements of market and counterparty risks and interest rate risk and currency exchange rate risk, which may exceed the amounts recognized by the Fund. 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. The average number of contracts open during the year ended March 31, 2013 was 3. There were no open futures contracts at March 31, 2013. I. 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. PIM is responsible for determining that the value of the collateral remains at least equal to the repurchase price. 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 0.35% of the Fund's average daily net assets up to $1 billion and 0.30% on assets over $1 billion. Prior to January 1, 2012, the Fund paid management fees calculated at the annual rate of 0.40% of the Fund's average daily net assets up to $1 billion and 0.35% on assets over $1 billion. For the year ended March 31, 2013, the effective management fee (excluding waivers and/or assumption of expenses) was equivalent to 0.34% of the Fund's average daily net assets. 100 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 PIM has contractually agreed to limit ordinary operating expenses to the extent required to reduce Fund expenses to 0.85%, 1.15%, and 0.65% of the average daily net assets attributable to Class A, Class C and Class Y shares, respectively. Fees waived and expenses reimbursed during the year ended March 31, 2013 are reflected on the Statement of Operations. These expense limitations are in effect through August 1, 2014. There can be no assurance that PIM will extend the expense limitation agreement for a class of shares beyond the date referred to above. In addition, under the management and administration agreements, certain other services and costs, including accounting, regulatory reporting, and insurance premiums, are paid by the Fund as administrative reimbursements. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $76,393 in management fees, administrative costs and certain other reimbursements payable to PIM at March 31, 2013. 3. Transfer Agent PIMSS, a wholly owned indirect subsidiary of UniCredit, provides substantially all transfer agent and shareowner services to the Fund at negotiated rates. In addition, the Fund reimburses PIMSS for out-of-pocket expenses incurred by PIMSS related to shareholder communications activities such as proxy and statement mailings, outgoing phone calls and omnibus relationship contracts. For the year ended March 31, 2013, such out-of-pocket expenses by class of shares were as follows: -------------------------------------------------------------------------------- Shareholder Communications: -------------------------------------------------------------------------------- Class A $ 70,201 Class C 35,617 Class Y 248,955 -------------------------------------------------------------------------------- Total $354,773 ================================================================================ Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $109,578 in transfer agent fees and out-of-pocket reimbursements payable from PIMSS at March 31, 2013. 4. Distribution Plan The Fund has adopted a Distribution Plan pursuant to Rule 12b-1 of the Investment Company Act of 1940 with respect to its Class A and Class C shares. Pursuant to the Plan, the Fund pays PFD 0.20% 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 0.50% of the average daily net assets attributable to Class C shares. The fee for Class C Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 101 shares consists of a 0.25% service fee and a 0.25% distribution fee paid as compensation for personal services and/or account maintenance services or distribution services with regard to Class C shares. Prior to July 1, 2012, the Fund paid PFD 0.25% of the average daily net assets attributable to Class A shares and 1.00% of the average daily net assets attributable to Class C shares. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $32,566 in distribution fees payable to PFD at March 31, 2013. In addition, redemptions of each class of shares (except Class K and Class Y shares) may be subject to a contingent deferred sales charge (CDSC). A CDSC of 1.00% may be imposed on redemptions of certain net asset value purchases of Class A shares within 12 months of purchase. For Class C shares purchased prior to July 1, 2012 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. For Class C shares purchased on or after July 1, 2012, no contingent deferred sales charge is charged. There is no CDSC for Class K or Class Y shares. Proceeds from the CDSCs are paid to PFD. For the year ended March 31, 2013, CDSCs of $89,438 were paid to PFD. 5. Expense Offset Arrangements The Fund has entered into certain expense offset arrangements with PIMSS, which may result in a reduction in the Fund's total expenses due to interest earned on cash held by PIMSS. For the year ended March 31, 2013, the Fund's expenses were not reduced under such arrangements. 6. Additional Disclosures about Derivative Instruments and Hedging Activities: The effect of derivative instruments on the Statement of Operations for the year ended March 31, 2013 was as follows: --------------------------------------------------------------------------------------------- Derivatives Not Change in Accounted for as Realized Unrealized Hedging Instruments Loss on Depreciation Under Accounting Location of Gain or (Loss) Derivatives on Derivatives Standards Codification on Derivatives Recognized Recognized Recognized (ASC) 815 in Income in Income in Income --------------------------------------------------------------------------------------------- Futures Contracts Net realized loss on futures contracts $(1,251) Futures Contracts Change in net unrealized depreciation $(688) on futures contracts 102 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 7. Line of Credit Facility The Fund, along with certain other funds in the Pioneer Family of Funds (the Funds), participates in a committed, unsecured revolving line of credit facility. Borrowings are used solely for temporary or emergency purposes. The Fund may borrow up to the lesser of the amount available under the facility or the limits set for borrowing by the Fund's prospectus and the 1940 Act. The credit facility in effect as of February 15, 2012 is in the amount of $215 million. Under such facility, depending on the type of loan, interest on borrowings is payable at the London Interbank Offered Rate (LIBOR) plus 0.90% on an annualized basis, or the Alternate Base Rate, which is the greater of (a) the facility's administrative agent's daily announced prime rate on the borrowing date, (b) 2% plus the Federal Funds Rate on the borrowing date and (c) 2% plus the overnight Euro dollar rate on the borrowing date. The Funds pay an annual commitment fee to participate in the credit facility. The commitment fee is allocated among participating Funds based on an allocation schedule set forth in the credit agreement. For the year ended March 31, 2013, the Fund had no borrowings under the credit facility. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 103 Report of Independent Registered Public Accounting Firm To the Board of Trustees of Pioneer Series Trust X and the Shareowners of Pioneer Multi-Asset Ultrashort Income Fund -------------------------------------------------------------------------------- We have audited the accompanying statement of assets and liabilities, including the schedule of investments, of Pioneer Multi-Asset Ultrashort Income Fund (formerly, Pioneer Multi-Asset Floating Rate Fund) (one of the portfolios constituting Pioneer Series Trust X (the "Trust")) as of March 31, 2013, and the related statement of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended and the financial highlights for each of the periods indicated therein. These financial statements and financial highlights are the responsibility of the Trust's management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audit. We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. We were not engaged to perform an audit of the Trust's internal control over financial reporting. Our audit included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Trust's internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements and financial highlights, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our procedures included confirmation of securities owned as of March 31, 2013, by correspondence with the custodian and brokers or by other appropriate auditing procedures where replies from brokers were not received. We believe that our audit provides a reasonable basis for our opinion. In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the financial position of Pioneer Multi-Asset Ultrashort Income Fund (formerly, Pioneer Multi-Asset Floating Rate Fund) at March 31, 2013, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended and the financial highlights for each of the periods indicated therein, in conformity with U.S. generally accepted accounting principles. Ernst & Young LLP Boston, Massachusetts May 28, 2013 104 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 Approval of Investment Advisory Agreement Pioneer Investment Management, Inc. (PIM) serves as the investment adviser to Pioneer Multi-Asset Ultrashort Income 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 2012 as the Trustees of the Fund agreed on, among other things, an overall approach and timeline for the process. In July 2012, 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 2012 and September 2012. 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, 2012 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 13, 2012, 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 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 105 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. 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 year period ended June 30, 2012. (In all quintile rankings referred to throughout this disclosure, first quintile is most favorable to the Fund's shareowners. Thus, highest relative performance would be first quintile and lowest relative expenses would also be first quintile.) The Trustees concluded that the investment performance of the Fund was satisfactory. Management Fee and Expenses The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees 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, 2012 was in the second quintile relative to the management fees paid by other funds in its Morningstar peer group for the comparable period. The Trustees also considered the breakpoint in the management fee schedule and the reduced fee rates above certain asset levels. The Trustees considered that the expense ratio of the Fund for the twelve months ended June 30, 2012 106 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 was in the fifth quintile relative to its Strategic Insight peer group for the comparable period. The Trustees noted the Fund's relatively small asset size compared to most of the other funds in the Fund's peer group and considered the impact of the Fund's non-management fee expenses on the Fund's expense ratio. The Trustees noted that PIM had recently lowered the Fund's expense caps. The Trustees also noted the recent increase in the Fund's total net assets. The Trustees reviewed management fees charged by PIM and PIM's affiliate, Pioneer Institutional Asset Management, Inc. (together with PIM, "Pioneer") to institutional and other clients, including publicly offered European funds sponsored by affiliates of Pioneer, unaffiliated 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 Pioneer's costs in providing services to the other clients and considered the differences in management fees and profit margins for Fund and non-Fund services. In evaluating the fees associated with Pioneer'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 Pioneer's management of 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. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 107 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 noted the breakpoint in the management fee schedule. 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 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 also considered the benefits to the Fund and to PIM and its affiliates from the use of "soft" commission dollars generated by the Fund to pay for research and brokerage services. The Trustees considered the intangible benefits to PIM by virtue of its relationship with the Fund and the other Pioneer funds. The Trustees concluded that the receipt of these benefits was reasonable in the context of the overall relationship between PIM and the Fund. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including all of the Independent Trustees, concluded that the investment advisory agreement between PIM and the Fund, including the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of the investment advisory agreement for the Fund. 108 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 Trustees, Officers and Service Providers Investment Adviser Pioneer Investment Management, Inc. Custodian and Sub-Administrator Brown Brothers Harriman & Co. Independent Registered Public Accounting Firm Ernst & Young LLP Principal Underwriter Pioneer Funds Distributor, Inc. Legal Counsel Bingham McCutchen LLP Shareowner Services and Transfer Agent Pioneer Investment Management Shareholder Services, Inc. Proxy Voting Policies and Procedures of the Fund are available without charge, upon request, by calling our toll free number (1-800-225-6292). Information regarding how the Fund voted proxies relating to portfolio securities during the most recent 12-month period ended June 30 is publicly available to shareowners at us.pioneerinvestments.com. This information is also available on the Securities and Exchange Commission's web site at www.sec.gov. Trustees and Officers The Fund's Trustees and Officers are listed on the following pages, together with their principal occupations during at least the past five years. Trustees who are interested persons of the Fund within the meaning of the 1940 Act are referred to as Interested Trustees. Trustees who are not interested persons of the Fund are referred to as Independent Trustees. Each of the Trustees serves as a trustee of each of the 56 U.S. registered investment portfolios for which Pioneer serves as investment adviser (the "Pioneer Funds"). The address for all Trustees and all officers of the Fund is 60 State Street, Boston, Massachusetts 02109. The Statement of Additional Information of the Fund includes additional information about the Trustees and is available, without charge, upon request, by calling 1-800-225-6292. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 109 Independent Trustees ---------------------------------------------------------------------------------------------------------------------------------- Name, Age and Term of Office and Other Directorships Position Held with the Fund Length of Service Principal Occupation Held by Trustee ---------------------------------------------------------------------------------------------------------------------------------- Thomas J. Perna (62) Trustee since 2011. Chairman and Chief Executive Officer, Director, Broadridge Chairman of the Board Serves until a Quadriserv, Inc. (technology products for Financial Solutions, Inc. and Trustee successor trustee is securities lending industry) (2008 - (investor communications and elected or earlier present); private investor (2004 - 2008); securities processing retirement or removal. and Senior Executive Vice President, The provider for financial Bank of New York (financial and securities services industry) (2009 - services) (1986 - 2004) present); Director, Quadriserv, Inc. (2005 - present); and Commissioner, New Jersey State Civil Service Commission (2011 - present) ---------------------------------------------------------------------------------------------------------------------------------- David R. Bock (69) Trustee since 2011. Managing Partner, Federal City Capital Director of Enterprise Trustee Serves until a Advisors (corporate advisory services Community Investment, Inc. successor trustee is company) (1997 - 2004 and 2008 - present); (privately-held affordable elected or earlier Interim Chief Executive Officer, Oxford housing finance company) (1985 retirement or removal. Analytica, Inc. (privately held research and - 2010); Director of Oxford consulting company) (2010); Executive Vice Analytica, Inc. (2008 - President and Chief Financial Officer, present); Director of The I-trax, Inc. (publicly traded health care Swiss Helvetia Fund, Inc. services company) (2004 - 2007); and (closed-end fund) (2010 - Executive Vice President and Chief Financial present); and Director of New Officer, Pedestal Inc. (internet-based York Mortgage Trust (publicly mortgage trading company) (2000 - 2002) traded mortgage REIT) (2004 - 2009, 2012 - present) ---------------------------------------------------------------------------------------------------------------------------------- Benjamin M. Friedman (68) Trustee since 2011. William Joseph Maier Professor of Political Trustee, Mellon Institutional Trustee Serves until a Economy, Harvard University (1972 - present) Funds Investment Trust and successor trustee is Mellon Institutional Funds elected or earlier Master Portfolio (oversaw 17 retirement or removal. portfolios in fund complex) (1989-2008) ---------------------------------------------------------------------------------------------------------------------------------- 110 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 ---------------------------------------------------------------------------------------------------------------------------------- Name, Age and Term of Office and Other Directorships Position Held with the Fund Length of Service Principal Occupation Held by Trustee ---------------------------------------------------------------------------------------------------------------------------------- Margaret B.W. Graham (65) Trustee since 2011. Founding Director, Vice President and None Trustee Serves until a Corporate Secretary, The Winthrop Group, successor trustee is Inc. (consulting firm) (1982-present); elected or earlier Desautels Faculty of Management, McGill retirement or removal. University (1999 - present); and Manager of Research Operations and Organizational Learning, Xerox PARC, Xerox's advance research center (1990-1994) ---------------------------------------------------------------------------------------------------------------------------------- Marguerite A. Piret (64) Trustee since 2011. President and Chief Executive Officer, Director of New America High Trustee Serves until a Newbury, Piret & Company, Inc. (investment Income Fund, Inc. (closed-end successor trustee is banking firm) (1981 - present) investment company) (2004 - elected or earlier present); and member, Board retirement or removal. of Governors, Investment Company Institute (2000 - 2006) ---------------------------------------------------------------------------------------------------------------------------------- Stephen K. West (84) Trustee since 2011. Senior Counsel, Sullivan & Cromwell LLP (law Director, The Swiss Helvetia Trustee Serves until a firm) (1998 - present); and Partner, Sullivan Fund, Inc. (closed-end successor trustee is & Cromwell LLP (prior to 1998) investment company); and elected or earlier Director, Invesco, Ltd. retirement or removal. (formerly AMVESCAP, PLC) (investment manager) (1997-2005) ---------------------------------------------------------------------------------------------------------------------------------- Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 111 Interested Trustees ---------------------------------------------------------------------------------------------------------------------------------- Name, Age and Term of Office and Other Directorships Position Held with the Fund Length of Service Principal Occupation Held by Trustee ---------------------------------------------------------------------------------------------------------------------------------- John F. Cogan, Jr. (86)* Trustee since 2011. Non-Executive Chairman and a director of None Trustee, President and Serves until a Pioneer Investment Management USA Inc. Chief Executive Officer successor trustee is ("PIM-USA"); Chairman and a director of of the Fund elected or earlier Pioneer; Chairman and Director of Pioneer retirement or removal. Institutional Asset Management, Inc. (since 2006); Director of Pioneer Alternative Investment Management Limited (Dublin) (until October 2011); President and a director of Pioneer Alternative Investment Management (Bermuda) Limited and affiliated funds; Deputy Chairman and a director of Pioneer Global Asset Management S.p.A. ("PGAM") (until April 2010); Director of Nano-C, Inc. (since 2003); Director of Cole Management Inc. (2004 - 2011); Director of Fiduciary Counseling, Inc. (until December 2011); President of all of the Pioneer Funds; and Retired Partner, Wilmer Cutler Pickering Hale and Dorr LLP ---------------------------------------------------------------------------------------------------------------------------------- Daniel K. Kingsbury (54)* Trustee since 2011. Director, CEO and President of PIM-USA None Trustee and Executive Serves until a (since February 2007); Director and Vice President successor trustee is President of Pioneer and Pioneer elected or earlier Institutional Asset Management, Inc. (since retirement or removal. February 2007); Executive Vice President of all of the Pioneer Funds (since March 2007); Director of PGAM (2007 - 2010); Head of New Europe Division, PGAM (2000 - 2005); Head of New Markets Division, PGAM (2005 - 2007) ---------------------------------------------------------------------------------------------------------------------------------- * Mr. Cogan and Mr. Kingsbury are Interested Trustees because they are officers or directors of the Fund's investment adviser and certain of its affiliates. 112 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 Fund Officers ---------------------------------------------------------------------------------------------------------------------------------- Name, Age and Term of Office and Principal Occupation Other Directorships Position Held with the Fund Length of Service Held by Officer ---------------------------------------------------------------------------------------------------------------------------------- Christopher J. Kelley (48) Since 2011. Serves at Vice President and Associate General Counsel None Secretary the discretion of the of Pioneer since January 2008 and Secretary Board. of all of the Pioneer Funds since June 2010; Assistant Secretary of all of the Pioneer Funds from September 2003 to May 2010; and Vice President and Senior Counsel of Pioneer from July 2002 to December 2007 ---------------------------------------------------------------------------------------------------------------------------------- Carol B. Hannigan (52) Since 2011. Serves at Fund Governance Director of Pioneer since None Assistant Secretary the discretion of the December 2006 and Assistant Secretary of all Board. the Pioneer Funds since June 2010; Manager - Fund Governance of Pioneer from December 2003 to November 2006; and Senior Paralegal of Pioneer from January 2000 to November 2003 ---------------------------------------------------------------------------------------------------------------------------------- Thomas Reyes (50) Since 2011. Serves at Counsel of Pioneer since June 2007 and None Assistant Secretary the discretion of the Assistant Secretary of all the Pioneer Funds Board. since June 2010; and Vice President and Counsel at State Street Bank from October 2004 to June 2007 ---------------------------------------------------------------------------------------------------------------------------------- Mark E. Bradley (53) Since 2011. Serves at Vice President - Fund Treasury of Pioneer; None Treasurer and Chief the discretion of the Treasurer of all of the Pioneer Funds since Financial and Accounting Board. March 2008; Deputy Treasurer of Pioneer from Officer of the Fund March 2004 to February 2008; and Assistant Treasurer of all of the Pioneer Funds from March 2004 to February 2008 ---------------------------------------------------------------------------------------------------------------------------------- Luis I. Presutti (47) Since 2011. Serves at Assistant Vice President - Fund Treasury of None Assistant Treasurer the discretion of the Pioneer; and Assistant Treasurer of all of Board. the Pioneer Funds ---------------------------------------------------------------------------------------------------------------------------------- Gary Sullivan (54) Since 2011. Serves at Fund Accounting Manager - Fund Treasury of None Assistant Treasurer the discretion of the Pioneer; and Assistant Treasurer of all of Board. the Pioneer Funds ---------------------------------------------------------------------------------------------------------------------------------- Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 113 Fund Officers (continued) ---------------------------------------------------------------------------------------------------------------------------------- Name, Age and Term of Office and Other Directorships Position Held with the Fund Length of Service Principal Occupation Held by Officer ---------------------------------------------------------------------------------------------------------------------------------- David F. Johnson (33) Since 2011. Serves at Fund Administration Manager - Fund Treasury None Assistant Treasurer the discretion of the of Pioneer since November 2008; Assistant Board. Treasurer of all of the Pioneer Funds since January 2009; and Client Service Manager - Institutional Investor Services at State Street Bank from March 2003 to March 2007 ---------------------------------------------------------------------------------------------------------------------------------- Jean M. Bradley (60) Since 2011. Serves at Chief Compliance Officer of Pioneer and of None Chief Compliance Officer the discretion of the all the Pioneer Funds since March 2010; Board. Director of Adviser and Portfolio Compliance at Pioneer since October 2005; and Senior Compliance Officer for Columbia Management Advisers, Inc. from October 2003 to October 2005 ---------------------------------------------------------------------------------------------------------------------------------- Kelley O'Donnell (42) Since 2011. Serves at Director--Transfer Agency Compliance of None Anti-Money Laundering the discretion of the Pioneer and Anti-Money Laundering Officer of Officer Board. all the Pioneer Funds since 2006 ---------------------------------------------------------------------------------------------------------------------------------- 114 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 This page for your notes. Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 115 This page for your notes. 116 Pioneer Multi-Asset Ultrashort Income Fund | Annual Report | 3/31/13 How to Contact Pioneer We are pleased to offer a variety of convenient ways for you to contact us for assistance or information. Call us for: -------------------------------------------------------------------------------- Account Information, including existing accounts, new accounts, prospectuses, applications and service forms 1-800-225-6292 FactFone(SM) for automated fund yields, prices, account information and transactions 1-800-225-4321 Retirement plans information 1-800-622-0176 Write to us: -------------------------------------------------------------------------------- PIMSS, Inc. P.O. Box 55014 Boston, Massachusetts 02205-5014 Our toll-free fax 1-800-225-4240 Our internet e-mail address ask.pioneer@pioneerinvestments.com (for general questions about Pioneer only) Visit our web site: us.pioneerinvestments.com This report must be preceded or accompanied by a prospectus. The Fund files a complete schedule of investments with the Securities and Exchange Commission for the first and third quarters for each fiscal year on Form N-Q. Shareholders may view the filed Form N-Q by visiting the Commission's web site at http://www.sec.gov. The filed form may also be viewed and copied at the Commission's Public Reference Room in Washington, DC. Information regarding the operations of the Public Reference Room may be obtained by calling 1-800-SEC-0330. [LOGO] PIONEER Investments(R) Pioneer Investment Management, Inc. 60 State Street Boston, MA 02109 us.pioneerinvestments.com Securities offered through Pioneer Funds Distributor, Inc. 60 State Street, Boston, MA 02109 Underwriter of Pioneer Mutual Funds, Member SIPC (C) 2013 Pioneer Investments 25671-01-0513 Pioneer Absolute Return Credit Fund -------------------------------------------------------------------------------- Annual Report | March 31, 2013 -------------------------------------------------------------------------------- Ticker Symbols: Class A RCRAX Class C RCRCX Class Y RCRYX [LOGO] PIONEER Investments(R) visit us: us.pioneerinvestments.com Table of Contents Letter to Shareowners 2 Portfolio Management Discussion 4 Portfolio Summary 10 Prices and Distributions 11 Performance Update 12 Comparing Ongoing Fund Expenses 15 Schedule of Investments 17 Financial Statements 63 Notes to Financial Statements 70 Report of Independent Registered Public Accounting Firm 82 Approval of Investment Advisory Agreement 84 Trustees, Officers and Service Providers 88 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 1 President's Letter Dear Shareowner, Pioneer continues to see only modest economic growth in the U.S. Employment continues to rise, albeit slowly, and we believe it will continue to do so in 2013, barring a negative shock to the system. The housing and auto sectors continue to recover, benefiting from record-low interest rates. Banks' willingness to lend to consumers and businesses also continues to rise, broad measures of inflation remain subdued, and, if the weather cooperates in 2013, food prices should come back down. And, while corporate profit growth has slowed, profits remain high and many U.S. companies continue to both pay and increase dividends*. Offsetting some of these positives are the continued contraction of fiscal policy in Washington and a recessionary Europe. The Federal Reserve's aggressive monetary policy has driven Treasury yields to generational lows and supported investments in all financial assets, including equities and high-yield corporate bonds. For example, the Standard & Poor's 500 Index (the S&P 500), a broad measure of the U.S. stock market, returned 15.99% for the full calendar year ended December 31, 2012, and the Bank of America Merrill Lynch High Yield Master II Index (the High Yield Index), which measures the performance of high-yield corporate bonds, returned 15.59% for the same 12-month period. On the other hand, the Barclays Aggregate Bond Index (the Aggregate Index), which tracks the performance of a higher-quality bond universe, gained 4.22% for the 12 months ended December 31, 2012; the safer-still Barclays Government Credit Index (the Government/Credit Index) returned 4.82%; and 3-month Treasury bills, generally regarded as essentially "risk free" by the markets, returned just 0.09% in 2012. "Risky" assets outperformed again in the first quarter of 2013, as the S&P 500 returned 10.60% and the High Yield Index returned 2.89%. In contrast, the Aggregate Index returned -0.12% in the first quarter, the Government Credit Index returned -0.16%, and Treasury bills returned 0.02%. Despite generally improving economic conditions and a rising stock market, global economies and investors still face daunting challenges as 2013 moves forward, although we remain cautiously optimistic. U.S. fiscal policy remains unsettled, and we feel the U.S. government could be at risk of credit rating downgrades from one or more of the major ratings agencies if the uncertainties persist. The Federal Reserve continues to provide extraordinary support to the U.S. economy and the bond market, but will not do so indefinitely. Europe has made progress, but has not yet resolved its sovereign-debt/banking problem, nor has the region been able to exit recession. Japan recently has unveiled aggressive and unconventional monetary and fiscal policies, but the country * Dividends are not guaranteed. 2 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 continues to face issues such as high levels of debt as well as an aging population. China and other emerging economies, while generally in better shape than most "developed" markets, also face a range of challenges. While most of the risks outlined here are widely recognized and may already be "priced in" to the market, we believe investors should continue to expect market volatility. At Pioneer, we have long advocated the benefits of staying diversified and investing for the long term. And while diversification does not assure a profit or protect against loss in a declining market, we believe there are still opportunities for prudent investors to earn attractive returns. 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, keeping in mind that there is no single best strategy that works for every investor. Pioneer's investment teams have, since 1928, sought out attractive opportunities in global equity and bond markets, using in-depth research to identify undervalued individual securities, and using thoughtful risk management to construct portfolios which balance potential risks and reward in an ever-changing world. We encourage you to learn more about Pioneer and our time-tested approach to investing by consulting with your financial advisor or visiting us online at us.pioneerinvestments.com. We greatly appreciate your trust in us, and we thank you for investing with Pioneer. Sincerely, /s/ Daniel K. Kingsbury Daniel K. Kingsbury President and CEO Pioneer Investment Management USA, Inc. Any information in this shareowner report regarding market or economic trends or the factors influencing the Fund's historical or future performance are statements of opinion as of the date of this report. These statements should not be relied upon for any other purposes. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 3 Portfolio Management Discussion | 3/31/13 Credit-sensitive bonds, led by high-yield corporates, delivered solid investment results during the 12 months ended March 31, 2013, after recovering from the effects of investor concerns about economic growth trends in Europe, China and the United States early in the period. In the following interview, Michael Temple, Andrew Feltus and Chin Liu discuss the factors that influenced the performance of Pioneer Absolute Return Credit Fund during the 12-month period ended March 31, 2013. Mr. Temple, a senior vice president and portfolio manager and Director of Fixed-Income Credit Research at Pioneer, and Mr. Feltus, a senior vice president and portfolio manager at Pioneer, are responsible for the day-to-day implementation of the Fund's investment strategies. Mr. Liu, a quantitative research analyst at Pioneer, provides investment management support to Mr. Feltus and Mr. Temple in implementing the portfolio's hedging strategies. Q How did the Fund perform during the 12 months ended March 31, 2013? A Pioneer Absolute Return Credit Fund's Class A shares returned 10.24% at net asset value during the 12 months ended March 31, 2013, while the Fund's benchmark, the Bank of America Merrill Lynch (BofA ML) U.S. Dollar 3-Month LIBOR Index, returned 0.43%. During the same 12-month period, the average return of the 298 mutual funds in Lipper's Absolute Return Funds category was 3.52%. Q How would you describe the investment environment for the credit markets during the 12 months ended March 31, 2013? A The past 12 months turned out to be a very good period for investing in credit-sensitive securities, especially high-yield corporates, after the market recovered from an early slump caused by a number of investor worries about global economic growth trends. The worries included concerns about the strength of the economy in the United States, slowing economic growth in China, and the lingering sovereign-debt problems in Europe. As a result of the concerns, high-yield and other perceived "riskier" asset classes fell out of favor and performed poorly during May of 2012. Market sentiment began to change as the summer wore on, however, and began to accelerate significantly in August 2012 when the new leader of the European Central Bank (ECB) declared that the ECB would do "whatever it takes" to protect the European Union and the euro currency. Shortly after that, the U.S. Federal Reserve Board (the Fed) announced its third round of quantitative easing in an effort to encourage lower long-term interest rates through the purchasing of agency mortgage-backed securities in the open market. Additionally, monetary authorities in China announced that they, too, were lowering short-term interest rates and easing credit conditions. 4 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 The news of these measures buoyed the credit markets, and then the resurgence picked up even more momentum in the fourth quarter of 2012 when signs of economic strengthening appeared in China, where a new government took office and announced pro-growth policies. Strong economic growth trends in select emerging markets further encouraged investor confidence. Global economic data was somewhat mixed during the first quarter of 2013, the final three months of the 12-month period, but the markets reacted favorably when elections in Japan brought a new national government that favored more-stimulative economic policies. The government's reforms included a more accommodative monetary policy put forth by the Bank of Japan, to which a new president was appointed. In the United States, meanwhile, progress in the manufacturing and housing sectors strengthened the market's confidence. While investors did worry about how political disagreements in Washington over fiscal policy could affect the nation's economy, temporary measures agreed upon by Congress and the President calmed fears enough to allow the rally in credit-sensitive securities to continue through the end of the period. Investors appeared to take comfort from signs of increased austerity by the U.S. government at a time when the private sector seemed to be strengthening. Q Which of your investment strategies were most beneficial for the Fund's performance during the 12 months ended March 31, 2013? A The principal driver of the Fund's solid results during the period was our focus on the credit sectors within the fixed-income markets. Performance benefited the most from the portfolio's allocations to high-yield corporate bonds, floating-rate bank loans, emerging market securities, international high-yield bonds and convertible securities. As one might expect in an environment where credit-sensitive bonds performed quite well, the Fund's use of hedging techniques to manage downside risks in the portfolio ended up being a slight drag on overall returns during the 12-month period, even though the hedging positions did help to cushion the effects of periodic market downturns. For instance, during the market's downturn in May of 2012, the general high-yield debt market was down by -1.21%, but the hedge positions helped to limit the Fund's losses for that month to -0.08% (Class A shares at net asset value). As of March 31, 2013, the Fund had more than 30% of its net assets invested in domestic high-yield corporate bonds--the largest sector allocation in the portfolio. Other notable Fund allocations as of the end of the period included those to floating-rate bank loans (roughly 15% of net assets), emerging market debt (roughly 8%), international high-yield bonds (roughly 7%), Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 5 convertible bonds (roughly 7%), U.S. investment-grade corporate bonds (roughly 6%), and event-linked (catastrophe) bonds issued by insurance companies (roughly 5%). Q Could you describe how hedges are used in managing the Fund? A The Fund's overall strategy is directed at seeking a positive return over an entire market cycle by investing in a broad portfolio of fixed-income securities. In addition to the Fund's investments in bonds and other securities, we also employ hedging techniques to help protect the portfolio's assets against the risks that come with investing in the fixed income markets. Such risks include portfolio exposure to credit sectors as well as from exposure to rising interest rates, which can undermine bond values. In managing the Fund, we use three layers of derivatives as part of our hedging tactics. Two of the hedges are used all the time, and the third is put into action during times of market stress. The first of the hedges uses futures contracts that "short" the equity market. This hedge layer is designed to profit during periods when the equity market, as represented by the Standard & Poor's 500 Index, declines. The second hedge layer uses volatility contracts, which are based on investors' attitudes about the direction and intensity of stock market trends. While the first two hedge layers were employed throughout the 12 months ended March 31, 2013, we also used the third hedge layer two different times during the period. The third hedge layer consists of investments in U.S. Treasury futures, and is designed to reduce the effects of extreme market stress on the portfolio. We used the third hedge layer early in the period when investors were fretting about the health of the global economy, and then used it again late in 2012 when the financial headlines were dominated by worries about how political infighting over U.S. budgetary policies might affect the domestic economy. Overall, the hedging techniques used during the period accomplished their main goal of reducing overall risk in the portfolio, despite their slightly negative effect on the Fund's otherwise very strong investment returns. Q What were some of the individual investments that affected the Fund's results during the 12 months ended March 31, 2013, either from a positive or negative standpoint? A The Fund received very good performance from many of its corporate bond holdings during the period, especially those in the financials sector, as investors recognized that many financial institutions have shored up their capital bases and now possess much stronger balance sheets than during the period leading up the market slump of 2008 and 2009. In particular, the portfolio's holding of a bond issued by Bank of America Merrill Lynch registered solid price appreciation during the period, in recognition that the company had a smaller debt load and greater 6 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 protections as a result of new financial industry regulations. Another corporate investment in the portfolio that performed very well during the period was a bond issued by Fage, a producer of Greek yogurt with operations in both the United States and Greece. Part of the bond's strong performance derived from the market's recognition that the company was not as vulnerable to problems in Greece as had been originally feared. Fund investments in the homebuilding industry also fared well during the period; most noteworthy in the homebuilding group was the performance of the debt of KB Home, which appreciated in value as the housing sector appeared to embark on a recovery. Despite the overall solid returns produced by credit-sensitive holdings, the Fund did own some disappointing investments during the period, including the convertible debt of James River Coal, which was hurt by weakening demand for coal. Fund positions in securities issued by information technology companies also underperformed during the period, as the entire sector fell out of favor with the market. Individual performance detractors in the portfolio from the information technology sector included bonds issued by Novellus Systems, a semiconductor equipment manufacturer, and by Nuance Communications, which specializes in the development of voice and language software. Q What is your investment outlook? A We are taking a cautious look at the market, as we are very cognizant that downside risks can increase following periods of strong rallies in the credit sectors. With that said, we also believe that securities with some credit risk are likely to continue to outperform Treasuries. We think overall economic growth is likely to continue to be modest, which should allow the Fed as well as other major central banks to continue their accommodative, low-interest-rate policies. In the U.S., we anticipate that the Fed will continue its policy of quantitative easing. To be sure, values in the fixed-income market are not overly attractive at present, as yields have fallen and prices have risen in virtually all sectors. Yields on U.S. Treasury securities, in particular, currently are in negative territory after taking inflation into consideration (known as "real" yields), In addition, Treasury prices appear high. Going forward, we expect to continue to emphasize the credit sectors in the Fund's portfolio, but expect to proceed carefully, while watching for any signs of changes in the economic backdrop, or in investors' expectations for future market trends. Please refer to the Schedule of Investments on pages 17-62 for a full listing of Fund securities. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 7 All investments are subject to risk, including the possible loss of principal. Pioneer Absolute Return Credit ("ARC") Fund has the ability to invest in a wide variety of debt securities. The Fund may invest in underlying funds (ETFs and unit investment trusts). In addition to the Fund's operating expenses, you will indirectly bear the operating expenses of investments in any underlying funds. The Fund and some of the underlying funds employ leverage, which increases the volatility of investment returns and subjects the Fund to magnified losses if an underlying fund's investments decline in value. The Fund and some of the underlying funds may use derivatives, such as options and futures, which can be illiquid, may disproportionately increase losses, and have a potentially large impact on Fund performance. The Fund may invest in inflation-linked securities. As inflationary expectations increase, inflation-linked securities may become more attractive, because they protect future interest payments against inflation. Conversely, as inflationary concerns decrease, inflation-linked securities will become less attractive and less valuable. The Fund may invest in credit default swaps, which may in some cases be illiquid, and they increase credit risk since the Fund has exposure to both the issuer of the referenced obligation and the counterparty to the credit default swap. The Fund may invest in floating-rate loans. The value of collateral, if any, securing a floating-rate loan can decline or may be insufficient to meet the issuer's obligations or may be difficult to liquidate. The Fund may invest in event-linked bonds. The return of principal and the payment of interest on event-linked bonds are contingent on the nonoccurrence of a pre-defined "trigger" event, such as a hurricane or an earthquake of a specific magnitude. The Fund may invest in zero coupon bonds and payment-in-kind securities, which may be more speculative and fluctuate more in value than other fixed income securities. The accrual of income from these securities are payable as taxable annual dividends to shareholders. Investments in equity securities are subject to price fluctuation. 8 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 Investments in fixed-income securities involve interest rate, credit, inflation, and reinvestment risks. As interest rates rise, the value of fixed-income securities falls. The Fund may invest in mortgage-backed securities, which during times of fluc- tuating interest rates may increase or decrease more than other fixed-income securities. Mortgage-Backed securities are also subject to pre-payments. Prepayment risk is the chance that mortgage-backed bonds will be paid off early if falling interest rates prompt homeowners to refinance their mortgages. High-yield bonds possess greater price volatility, illiquidity, and possibility of default. There is no assurance that these and other strategies used by the Fund or underlying funds will be successful. Absolute return funds are not intended to outperform stocks and bonds during strong market rallies. These risks may increase share price volatility. Please see the prospectus for a more complete discussion of the Fund's risks. 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 statements should not be relied upon for any other purposes. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 9 Portfolio Summary | 3/31/13 Portfolio Diversification -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] U.S. Corporate Bonds 35.2% International Corporate Bonds 21.2% Senior Secured Loans 13.9% Temporary Cash Investment 13.4% Convertible Corporate Bonds 7.0% Collateralized Mortgage Obligations 4.4% Asset Backed Securities 1.8% U.S. Preferred Stocks 1.4% Municipal Bonds 1.0% Convertible Preferred Stocks 0.5% Foreign Government Bonds 0.2% Portfolio Quality -------------------------------------------------------------------------------- (As a percentage of total investment portfolio; based on S&P ratings) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] AAA 0.1% AA 0.7% A 2.9% BBB 10.8% BB 26.9% B 36.4% Not Rated 9.3% Cash Equivalents 8.3% CCC 4.6% 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. City of Charlotte North Carolina, 5.6%, 7/1/27 0.68% -------------------------------------------------------------------------------- 2. Lam Research Corp., 1.25%, 5/15/18 0.65 -------------------------------------------------------------------------------- 3. Everglades Re, Ltd., Floating Rate Note, 4/30/14 (Cat Bond) (144A) 0.59 -------------------------------------------------------------------------------- 4. Shelf Drilling Holdings, Ltd., 8.625%, 11/1/18 (144A) 0.52 -------------------------------------------------------------------------------- 5. Scottrade Financial Services, Inc., 6.125%, 7/11/21 (144A) 0.51 -------------------------------------------------------------------------------- 6. PetroBakken Energy, Ltd., 8.625%, 2/1/20 (144A) 0.48 -------------------------------------------------------------------------------- 7. j2 Global, Inc., 8.0%, 8/1/20 0.47 -------------------------------------------------------------------------------- 8. Cobalt International Energy, Inc., 2.625%, 12/1/19 0.47 -------------------------------------------------------------------------------- 9. Drill Rigs Holdings, Inc., 6.5%, 10/1/17 (144A) 0.46 -------------------------------------------------------------------------------- 10. SanDisk Corp., 1.5%, 8/15/17 0.46 -------------------------------------------------------------------------------- * This list excludes temporary cash investments and derivative instruments. The portfolio is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any security listed. 10 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 Prices and Distributions | 3/31/13 Net Asset Value per Share -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 3/31/13 3/31/12 -------------------------------------------------------------------------------- A $10.04 $9.63 -------------------------------------------------------------------------------- C $10.02 $9.61 -------------------------------------------------------------------------------- Y $10.08 $9.66 -------------------------------------------------------------------------------- Distributions per Share: 4/1/12-3/31/13 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains -------------------------------------------------------------------------------- A $0.5494 $ -- $ -- -------------------------------------------------------------------------------- C $0.4762 $ -- $ -- -------------------------------------------------------------------------------- Y $0.5833 $ -- $ -- -------------------------------------------------------------------------------- The Bank of America Merrill Lynch U.S. Dollar 3-Month LIBOR Index is an unmanaged index that tracks the performance of a synthetic asset paying the London Interbank Offered Rate (LIBOR), with a constant 3-month average maturity. The index is based on the assumed purchase at par value of a synthetic instrument having exactly its stated maturity and with a coupon equal to that day's 3-month LIBOR rate. Index returns 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 12-14. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 11 Performance Update | 3/31/13 Class A Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Absolute Return Credit Fund at public offering price, compared to that of the Bank of America (BofA) Merrill Lynch U.S. Dollar 3-Month LIBOR Index. Average Annual Total Returns (As of March 31, 2013) -------------------------------------------------------------------------------- Net Asset Public Offering Period Value (NAV) Price (POP) -------------------------------------------------------------------------------- Life-of-Class (5/2/11) 5.40% 2.92% 1 Year 10.24 5.32 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated April 1, 2013) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 1.66% 1.20% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Absolute BofA Merrill Lynch U.S. Return Credit Fund Dollar 3-Month LIBOR Index 4/30/2011 $ 9,550 $10,000 3/31/2012 $ 9,587 $10,032 3/31/2013 $10,569 $10,075 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 August 1, 2014, for Class A shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. 12 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 Performance Update | 3/31/13 Class C Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Absolute Return Credit Fund, compared to that of the Bank of America (BofA) Merrill Lynch U.S. Dollar 3-Month LIBOR Index. Average Annual Total Returns (As of March 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class (5/2/11) 4.55% 4.55% 1 Year 9.44% 9.44% -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated April 1, 2013) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 2.46% 2.10% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Absolute BofA Merrill Lynch U.S. Return Credit Fund Dollar 3-Month LIBOR Index 4/30/2011 $10,000 $10,000 3/31/2012 $ 9,953 $10,032 3/31/2013 $10,893 $10,075 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 subject to a 1% contingent deferred sales charge (CDSC). "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. 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 August 1, 2014, for Class C shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus 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 Absolute Return Credit Fund | Annual Report | 3/31/13 13 Performance Update | 3/31/13 Class Y Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 million investment made in Pioneer Absolute Return Credit Fund, compared to that of the Bank of America (BofA) Merrill Lynch U.S. Dollar 3-Month LIBOR Index. Average Annual Total Returns (As of March 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class (5/2/11) 5.94% 5.94% 1 Year 10.69 10.69 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated April 1, 2013) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 1.30% 0.85% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $5 Million Investment Pioneer Absolute BofA Merrill Lynch U.S. Return Credit Fund Dollar 3-Month LIBOR Index 5/31/2011 $5,000,000 $5,000,000 3/31/2012 $5,047,246 $5,016,143 3/31/2013 $5,586,945 $5,037,507 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 Y shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects the contractual expense limitation currently in effect through August 1, 2014, for Class Y shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus 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 Absolute Return Credit Fund | Annual Report | 3/31/13 Comparing Ongoing Fund Expenses As a shareowner in the Fund, you incur two types of costs: (1) ongoing costs, including management fees, distribution and/or service (12b-1) fees, and other Fund expenses; and (2) transaction costs, including sales charges (loads) on purchase payments. This example is intended to help you understand your ongoing expenses (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. The example is based on an investment of $1,000 at the beginning of the Fund's latest six-month period and held throughout the six months. Using the Tables -------------------------------------------------------------------------------- Actual Expenses The first table below provides information about actual account values and actual expenses. You may use the information in this table, together with the amount you invested, to estimate the expenses that you paid over the period as follows: (1) Divide your account value by $1,000 Example: an $8,600 account value (divided by) $1,000 = 8.6 (2) Multiply the result in (1) above by the corresponding share class's number in the third row under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. Expenses Paid on a $1,000 Investment in Pioneer Absolute Return Credit Fund Based on actual returns from October 1, 2012, through March 31, 2013. -------------------------------------------------------------------------------- Share Class A C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 Value on 10/1/12 -------------------------------------------------------------------------------- Ending Account Value $1,047.81 $1,043.98 $1,050.49 (after expenses) on 3/31/13 -------------------------------------------------------------------------------- Expenses Paid $ 6.13 $ 9.94 $ 4.35 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized net expense ratio of 1.20%, 1.95%, and 0.85% for Class A, Class C and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 182/365 (to reflect the one-half year period). Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 15 Hypothetical Example for Comparison Purposes The table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the tables are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as sales charges (loads) that are charged at the time of the transaction. Therefore, the table below is useful in comparing ongoing costs only and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher. Expenses Paid on a $1,000 Investment in Pioneer Absolute Return Credit Fund Based on a hypothetical 5% return per year before expenses, reflecting the period from October 1, 2012, through March 31, 2013. -------------------------------------------------------------------------------- Share Class A C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 Value on 10/1/12 -------------------------------------------------------------------------------- Ending Account Value $1,018.95 $1,015.21 $1,020.69 (after expenses) on 3/31/13 -------------------------------------------------------------------------------- Expenses Paid $ 6.04 $ 9.80 $ 4.28 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized net expense ratio of 1.20%, 1.95%, and 0.85% for Class A, Class C and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 182/365 (to reflect the one-half year period). 16 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 Schedule of Investments | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- CONVERTIBLE CORPORATE BONDS -- 7.2% ENERGY -- 1.0% Oil & Gas Exploration & Production -- 0.6% 200,000 BB-/Ba3 Chesapeake Energy Corp., 2.25%, 12/15/38 $ 177,500 150,000 BB-/Ba3 Chesapeake Energy Corp., 2.5%, 5/15/37 143,719 765,000 NR/NR Cobalt International Energy, Inc., 2.625%, 12/1/19 854,409 100,000 B-/NR Stone Energy Corp., 1.75%, 3/1/17 (144A) 91,875 --------------- $ 1,267,503 ----------------------------------------------------------------------------------------------------------------- Oil & Gas Storage & Transportation -- 0.4% 700,000 NR/NR Golar LNG, Ltd., 3.75%, 3/7/17 $ 706,720 ----------------------------------------------------------------------------------------------------------------- Coal & Consumable Fuels -- 0.0%+ 223,000 CC/B2 James River Coal Co., 3.125%, 3/15/18 $ 44,600 --------------- Total Energy $ 2,018,823 ----------------------------------------------------------------------------------------------------------------- MATERIALS -- 0.1% Steel -- 0.1% 250,000 BB/B1 United States Steel Corp., 2.75%, 4/1/19 $ 252,812 --------------- Total Materials $ 252,812 ----------------------------------------------------------------------------------------------------------------- CAPITAL GOODS -- 0.5% Electrical Components & Equipment -- 0.1% 100,000 B/B2 General Cable Corp., 4.5%, 11/15/29 (Step) $ 124,750 ----------------------------------------------------------------------------------------------------------------- Construction & Farm Machinery & Heavy Trucks -- 0.4% 305,000 NR/NR Greenbrier Companies, Inc., 3.5%, 4/1/18 $ 305,191 550,000 B-/NR Meritor, Inc., 7.875%, 3/1/26 (144A) 557,906 --------------- $ 863,097 --------------- Total Capital Goods $ 987,847 ----------------------------------------------------------------------------------------------------------------- CONSUMER DURABLES & APPAREL -- 0.2% Homebuilding -- 0.2% 400,000 B/B2 KB Home, 1.375%, 2/1/19 $ 439,750 --------------- Total Consumer Durables & Apparel $ 439,750 ----------------------------------------------------------------------------------------------------------------- CONSUMER SERVICES -- 0.1% Casinos & Gaming -- 0.1% 250,000 B+/B3 MGM Resorts International, 4.25%, 4/15/15 $ 271,406 --------------- Total Consumer Services $ 271,406 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 17 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- FOOD, BEVERAGE & TOBACCO -- 0.1% Tobacco -- 0.1% 200,000 CCC+/Caa2 Alliance One International, Inc., 5.5%, 7/15/14 $ 204,250 --------------- Total Food, Beverage & Tobacco $ 204,250 ----------------------------------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 1.0% Health Care Equipment -- 0.6% 550,000 B+/NR Hologic, Inc., 2.0%, 3/1/42 (Step) $ 576,125 700,000 NR/NR NuVasive, Inc., 2.75%, 7/1/17 680,750 --------------- $ 1,256,875 ----------------------------------------------------------------------------------------------------------------- Managed Health Care -- 0.4% 550,000 NR/NR Molina Healthcare, Inc., 1.125%, 1/15/20 (144A) $ 550,000 300,000 A-/NR WellPoint, Inc., 2.75%, 10/15/42 (144A) 327,750 --------------- $ 877,750 --------------- Total Health Care Equipment & Services $ 2,134,625 ----------------------------------------------------------------------------------------------------------------- PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 1.2% Biotechnology -- 0.7% 50,000 NR/NR Corsicanto, Ltd., 3.5%, 1/15/32 $ 61,781 130,000 NR/NR PDL BioPharma, Inc., 3.75%, 5/1/15 155,675 500,000 NR/NR Theravance, Inc., 2.125%, 1/15/23 547,812 500,000 NR/NR Vertex Pharmaceuticals, Inc., 3.35%, 10/1/15 599,062 --------------- $ 1,364,330 ----------------------------------------------------------------------------------------------------------------- Pharmaceuticals -- 0.5% 300,000 NR/NR Auxilium Pharmaceuticals, Inc., 1.5%, 7/15/18 $ 303,750 195,000 NR/NR Pacira Pharmaceuticals, Inc. Delaware, 3.25%, 2/1/19 (144A) 265,688 500,000 NR/NR Salix Pharmaceuticals, Ltd., 1.5%, 3/15/19 (144A) 530,312 --------------- $ 1,099,750 --------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 2,464,080 ----------------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 0.1% Consumer Finance -- 0.1% 115,000 B+/NR DFC Global Corp., 3.25%, 4/15/17 (144A) $ 119,744 --------------- Total Diversified Financials $ 119,744 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 18 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- SOFTWARE & SERVICES -- 0.6% Internet Software & Services -- 0.2% 355,000 NR/NR Blucora, Inc., 4.25%, 4/1/19 (144A) $ 366,759 100,000 NR/NR WebMD Health Corp., 2.5%, 1/31/18 92,000 --------------- $ 458,759 ----------------------------------------------------------------------------------------------------------------- Application Software -- 0.4% 175,000 NR/NR Mentor Graphics Corp., 4.0%, 4/1/31 $ 205,516 500,000 BB-/NR Nuance Communications, Inc., 2.75%, 11/1/31 516,562 --------------- $ 722,078 --------------- Total Software & Services $ 1,180,837 ----------------------------------------------------------------------------------------------------------------- TECHNOLOGY HARDWARE & EQUIPMENT -- 0.7% Computer Storage & Peripherals -- 0.4% 650,000 BB/NR SanDisk Corp., 1.5%, 8/15/17 $ 837,688 ----------------------------------------------------------------------------------------------------------------- Electronic Components -- 0.3% 680,000 BB+/NR Vishay Intertechnology, Inc., 2.25%, 5/15/41 (144A) $ 623,900 --------------- Total Technology Hardware & Equipment $ 1,461,588 ----------------------------------------------------------------------------------------------------------------- SEMICONDUCTORS & SEMICONDUCTOR EQUIPMENT -- 1.6% Semiconductor Equipment -- 0.7% 1,125,000 BBB-/Baa1 Lam Research Corp., 1.25%, 5/15/18 $ 1,200,234 100,000 BBB-/NR Novellus Systems, Inc., 2.625%, 5/15/41 136,062 --------------- $ 1,336,296 ----------------------------------------------------------------------------------------------------------------- Semiconductors -- 0.9% 300,000 A-/NR Intel Corp., 2.95%, 12/15/35 $ 318,375 30,000 A-/A2 Intel Corp., 3.25%, 8/1/39 36,112 55,000 NR/NR JA Solar Holdings Co., Ltd., 4.5%, 5/15/13 52,938 50,000 NR/NR JinkoSolar Holding Co., Ltd., 4.0%, 5/15/16 (144A) 30,000 700,000 BB+/NR ON Semiconductor Corp., 2.625%, 12/15/26 793,188 150,000 NR/NR ReneSola, Ltd., 4.125%, 3/15/18 (144A) 76,500 650,000 NR/NR SunPower Corp., 4.75%, 4/15/14 650,000 --------------- $ 1,957,113 --------------- Total Semiconductors & Semiconductor Equipment $ 3,293,409 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 19 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- TELECOMMUNICATION SERVICES -- 0.0%+ Integrated Telecommunication Services -- 0.0%+ 100,000 B/NR Ciena Corp., 0.875%, 6/15/17 $ 90,438 --------------- Total Telecommunication Services $ 90,438 ----------------------------------------------------------------------------------------------------------------- TOTAL CONVERTIBLE CORPORATE BONDS (Cost $14,623,511) $ 14,919,609 ----------------------------------------------------------------------------------------------------------------- PREFERRED STOCKS -- 1.4% BANKS -- 0.5% Diversified Banks -- 0.2% 12,250 6.50 A-/Baa1 US Bancorp, Floating Rate Note (Perpetual) $ 365,785 6,000 6.00 A-/Baa1 US Bancorp, Floating Rate Note (Perpetual) 167,040 --------------- $ 532,825 ----------------------------------------------------------------------------------------------------------------- Regional Banks -- 0.3% 5,000 6.25 A-/NR CoBank ACB, Floating Rate Note (Perpetual) (144A) $ 533,906 --------------- Total Banks $ 1,066,731 ----------------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 0.5% Other Diversified Financial Services -- 0.4% 17,200 7.88 BB/Ba2 Citigroup Capital XIII, Floating Rate Note, 10/30/40 $ 491,748 7,750 8.12 CCC+/B3 GMAC Capital Trust I, Floating Rate Note, 2/15/40 210,800 2,500 Lorenz Re* $ 250,000 --------------- $ 952,548 ----------------------------------------------------------------------------------------------------------------- Consumer Finance -- 0.1% 100 CCC+/B3 Ally Financial, Inc., 7.0%, 12/31/99 (Perpetual) (144A) $ 98,900 --------------- Total Diversified Financials $ 1,051,448 ----------------------------------------------------------------------------------------------------------------- INSURANCE -- 0.1% Property & Casualty Insurance -- 0.1% 9,000 5.10 BBB/Baa1 The Allstate Corp., Floating Rate Note, 1/15/53 $ 235,620 --------------- Total Insurance $ 235,620 ----------------------------------------------------------------------------------------------------------------- TELECOMMUNICATION SERVICES -- 0.1% Integrated Telecommunication Services -- 0.1% 4,400 BBB-/Baa3 Qwest Corp., 7.375%, 6/1/51 $ 116,864 --------------- Total Telecommunication Services $ 116,864 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 20 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- UTILITIES -- 0.3% Electric Utilities -- 0.3% 25,000 BB+/NR PPL Capital Funding, Inc., 5.9%, 4/30/73 $ 630,500 --------------- Total Utilities $ 630,500 ----------------------------------------------------------------------------------------------------------------- TOTAL PREFERRED STOCKS (Cost $2,974,700) $ 3,101,163 ----------------------------------------------------------------------------------------------------------------- CONVERTIBLE PREFERRED STOCKS -- 0.1% BANKS -- 0.1% Diversified Banks -- 0.1% 100 BBB+/Ba1 Wells Fargo & Co., 7.5% (Perpetual) $ 128,875 --------------- Total Banks $ 128,875 ----------------------------------------------------------------------------------------------------------------- TOTAL CONVERTIBLE PREFERRED STOCKS (Cost $100,637) $ 128,875 ----------------------------------------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------------------------------- Principal Amount ($) ----------------------------------------------------------------------------------------------------------------- ASSET BACKED SECURITIES -- 1.9% MATERIALS -- 1.0% Aluminum -- 0.4% 174,110 B+/B1 Bayview Financial Mortgage Pass-Through Trust 2007-B, 6.407%, 8/28/47 (Step) $ 178,870 347,195 7.78 NR/B3 GE Mortgage Services LLC, Floating Rate Note, 3/25/27 343,874 250,000 6.55 B-/B3 Security National Mortgage Loan Trust 2007-1, Floating Rate Note, 4/25/37 (144A) 244,958 --------------- $ 767,702 ----------------------------------------------------------------------------------------------------------------- Precious Metals & Minerals -- 0.0%+ 21,785 BBB/NR Mid-State Capital Trust 2010-1, 7.0%, 12/15/45 (144A) $ 22,699 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 21 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Steel -- 0.6% 672,498 B+/B3 Accredited Mortgage Loan Trust 2003-3, 5.21%, 1/25/34 (Step) $ 642,442 85,000 1.25 AA+/A3 Bear Stearns Asset Backed Securities I Trust 2004-BO1, Floating Rate Note, 10/25/34 80,473 356,309 0.30 CCC/Caa3 Morgan Stanley Home Equity Loan Trust 2007-2, Floating Rate Note, 4/25/37 283,593 234,629 CC/Caa2 RASC Series 2003-KS5 Trust, 4.46%, 7/25/33 (Step) 223,496 --------------- $ 1,230,004 --------------- Total Materials $ 2,020,405 ----------------------------------------------------------------------------------------------------------------- CONSUMER SERVICES -- 0.1% Hotels, Resorts & Cruise Lines -- 0.1% 202,269 BB/NR Westgate Resorts 2012-2 LLC, 9.0%, 1/20/25 (144A) $ 205,999 --------------- Total Consumer Services $ 205,999 ----------------------------------------------------------------------------------------------------------------- BANKS -- 0.5% Thrifts & Mortgage Finance -- 0.5% 100,000 BB/NR CarNow Auto Receivables Trust 2012-1, 6.9%, 11/15/16 (144A) $ 100,218 69,859 BB/B2 Citicorp Residential Mortgage Trust Series 2006-1, 5.836%, 7/25/36 (Step) 69,609 114,347 BB-/B1 Citicorp Residential Mortgage Trust Series 2006-1, 5.939%, 7/25/36 (Step) 114,053 125,000 B-/B2 Citicorp Residential Mortgage Trust Series 2007-1, 5.892%, 3/25/37 (Step) 123,476 34,501 4.46 BB+/Ba1 Countrywide Asset-Backed Certificates, Floating Rate Note, 10/25/35 34,636 79,169 0.37 NR/Caa2 Countrywide Asset-Backed Certificates, Floating Rate Note, 11/25/36 (144A) 69,280 100,000 BBB/NR HLSS Servicer Advance Receivables Backed Notes, 4.458%, 1/15/48 (144A) 102,460 145,527 NR/Ba1 Leaf Receivables Funding 8 LLC, 5.5%, 9/15/20 (144A) 129,563 144,527 0.36 BB+/Ba1 RAMP Series 2006-RZ3 Trust, Floating Rate Note, 8/25/36 135,785 200,000 A/NR STORE Master Funding LLC, 4.16%, 3/20/43 (144A) 201,226 --------------- $ 1,080,306 --------------- Total Banks $ 1,080,306 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 22 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 0.3% Other Diversified Financial Services -- 0.3% 55,067 BB/NR Sierra Timeshare 2011-3 Receivables Funding LLC, 9.31%, 7/20/28 (144A) $ 57,053 500,000 BB/NR Springleaf Funding Trust 2013-A, 5.0%, 9/15/21 (144A) 493,388 --------------- $ 550,441 --------------- Total Diversified Financials $ 550,441 ----------------------------------------------------------------------------------------------------------------- TOTAL ASSET BACKED SECURITIES (Cost $3,829,893) $ 3,857,151 ----------------------------------------------------------------------------------------------------------------- COLLATERALIZED MORTGAGE OBLIGATIONS -- 4.6% CONSUMER SERVICES -- 0.1% Hotels, Resorts & Cruise Lines -- 0.1% 227,000 BB+/NR Motel 6 Trust, 4.274%, 10/5/25 (144A) $ 228,499 --------------- Total Consumer Services $ 228,499 ----------------------------------------------------------------------------------------------------------------- BANKS -- 3.5% Thrifts & Mortgage Finance -- 3.5% 126,904 BBB-/B3 Alternative Loan Trust 2004-2CB, 5.75%, 3/25/34 $ 125,054 368,418 0.59 NR/Baa3 Bayview Commercial Asset Trust, Floating Rate Note, 1/25/36 (144A) 296,042 317,345 0.51 AA+/Baa3 Bayview Commercial Asset Trust, Floating Rate Note, 8/25/35 (144A) 253,634 139,741 2.49 A+/Ba1 Bear Stearns ALT-A Trust 2003-3, Floating Rate Note, 10/25/33 127,770 100,000 5.21 NR/Baa2 Bear Stearns Commercial Mortgage Securities Trust 2005-PWR7, Floating Rate Note, 2/11/41 102,584 46,735 5.61 B+/NR CHL Mortgage Pass-Through Trust 2002-32, Floating Rate Note, 1/25/33 47,090 200,000 5.03 NR/Aaa Citigroup Commercial Mortgage Trust 2005-EMG, Floating Rate Note, 9/20/51 (144A) 203,114 300,000 5.74 NR/Baa3 Citigroup Commercial Mortgage Trust 2006-C4, Floating Rate Note, 3/15/49 312,052 73,209 NR/Baa1 Citigroup Mortgage Loan Trust, Inc., 6.75%, 8/25/34 78,012 88,501 0.38 A+/A1 COMM 2007-FL14 Mortgage Trust, Floating Rate Note, 6/15/22 (144A) 87,200 100,000 5.77 NR/A2 COMM 2010-C1 Mortgage Trust, Floating Rate Note, 7/10/46 (144A) 117,499 100,000 NR/Baa3 COMM 2011-THL Mortgage Trust, 5.949%, 6/9/28 (144A) 102,644 The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 23 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 100,000 4.86 NR/Baa3 COMM 2012-CCRE2 Mortgage Trust, Floating Rate Note, 8/15/45 (144A) $ 97,685 303,000 4.58 BBB-/Baa3 COMM 2012-CCRE4 Mortgage Trust, Floating Rate Note, 10/15/45 (144A) 286,343 200,000 NR/NR Extended Stay America Trust 2013-ESH MZ, 7.625%, 12/5/19 (144A) 211,442 350,000 5.15 BBB-/NR GE Capital Commercial Mortgage Corp., Floating Rate Note, 7/10/45 (144A) 351,141 200,000 3.80 NR/Ba2 GS Mortgage Securities Corp. II, Floating Rate Note, 11/8/29 (144A) 200,849 100,000 NR/NR GS Mortgage Securities Corp. II, 4.209%, 2/10/21 (144A) 100,890 110,000 5.64 NR/Baa3 GS Mortgage Securities Trust 2012-GC6, Floating Rate Note, 1/10/45 (144A) 113,991 99,528 5.25 BB-/NR GSR Mortgage Loan Trust 2005-AR4, Floating Rate Note, 7/25/35 97,891 200,000 6.00 B-/NR JP Morgan Chase Commercial Mortgage Securities Trust 2007-LDP12, Floating Rate Note, 2/15/51 175,349 257,107 2.98 NR/Caa1 JP Morgan Mortgage Trust 2005-A7, Floating Rate Note, 10/25/35 245,533 463,990 5.28 BB/NR LB-UBS Commercial Mortgage Trust 2006-C1, Floating Rate Note, 2/15/41 465,936 624,134 2.64 BB+/Ba1 MASTR Adjustable Rate Mortgages Trust 2003-6, Floating Rate Note, 12/25/33 610,807 196,136 5.29 B-/B3 MASTR Adjustable Rate Mortgages Trust, Floating Rate Note, 1/25/35 188,700 123,748 B-/NR MASTR Alternative Loan Trust 2004-6, 6.0%, 7/25/34 125,859 301,184 D/Caa3 Merrill Lynch Mortgage Investors Trust Series 2006-AF1, 5.75%, 8/25/36 247,851 77,846 0.98 AA+/Baa1 MortgageIT Trust 2004-1, Floating Rate Note, 11/25/34 75,174 300,000 6.70 NR/NR New York Securitization Trust 2012-1, Floating Rate Note, 12/27/47 (144A) 300,000 300,000 4.45 BBB/Baa3 NorthStar 2012-1 Mortgage Trust, Floating Rate Note, 8/25/29 (144A) 305,015 232,343 NR/Baa3 RCMC LLC, 5.623%, 11/15/44 (144A) 232,312 203,245 1.60 B-/Ba1 RESI Finance LP, Floating Rate Note, 9/10/35 (144A) 178,965 200,000 5.30 BBB/NR Springleaf Mortgage Loan Trust 2012-3, Floating Rate Note, 12/25/59 (144A) 204,001 137,493 1.70 A+/Ba3 Structured Asset Mortgage Investments Trust 2003-AR1, Floating Rate Note, 10/19/33 120,393 The accompanying notes are an integral part of these financial statements. 24 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 19,548 CC/Caa2 Structured Asset Securities Corp Trust 2005-15, 6.0%, 8/25/35 $ 19,032 30,000 BB/B1 Timberstar Trust, 7.53%, 10/15/36 (144A) 31,006 100,000 NR/Ba2 Wells Fargo Commercial Mortgage Trust, 4.0%, 11/15/43 (144A) 78,620 50,000 AA-/NR WFDB Commercial Mortgage Trust, 5.914%, 7/5/24 (144A) 51,304 100,000 5.47 NR/Baa3 WFRBS Commercial Mortgage Trust 2011-C2, Floating Rate Note, 2/15/44 (144A) 104,307 50,000 5.25 NR/Baa1 WFRBS Commercial Mortgage Trust 2011-C4, Floating Rate Note, 6/15/44 (144A) 52,962 200,000 4.50 BBB-/NR WF-RBS Commercial Mortgage Trust, Floating Rate Note, 3/15/48 181,985 --------------- $ 7,308,038 --------------- Total Banks $ 7,308,038 ----------------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 0.7% Other Diversified Financial Services -- 0.3% 113,538 5.45 NR/A2 DBUBS 2011-LC2 Mortgage Trust, Floating Rate Note, 7/10/44 (144A) $ 129,724 100,000 0.90 BBB+/A3 Morgan Stanley Capital I, Inc. Class C, Floating Rate Note, 12/15/20 (144A) 97,568 76,178 7.35 B+/Ba3 Morgan Stanley Capital I, Inc., Floating Rate Note, 7/15/32 (144A) 79,229 84,552 2.64 A+/NR Structured Adjustable Rate Mortgage Loan Trust, Floating Rate Note, 7/25/34 83,849 250,000 NR/NR Vericrest Opportunity Loan Transferee, 6.414%, 2/26/52 (144A) 253,125 --------------- $ 643,495 ----------------------------------------------------------------------------------------------------------------- Specialized Finance -- 0.3% 125,000 5.81 BB-/NR COBALT CMBS Commercial Mortgage Trust 2007-C3, Floating Rate Note, 5/15/46 $ 140,036 456,990 BB+/Baa2 Spirit Master Funding LLC, 5.74%, 3/20/25 (144A) 469,771 --------------- $ 609,807 ----------------------------------------------------------------------------------------------------------------- Consumer Finance -- 0.0%+ 63,179 5.10 CCC/NR GMACM Mortgage Loan Trust 2005-AR2, Floating Rate Note, 5/25/35 $ 62,042 ----------------------------------------------------------------------------------------------------------------- Investment Banking & Brokerage -- 0.1% 145,520 5.72 BBB/NR Banc of America Merrill Lynch Commercial Mortgage, Inc., Floating Rate Note, 9/10/47 (144A) $ 151,651 --------------- Total Diversified Financials $ 1,466,995 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 25 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- REAL ESTATE -- 0.3% Mortgage REITs -- 0.3% 58,679 2.45 BBB-/B2 American Home Mortgage Investment Trust 2005-1, Floating Rate Note, 6/25/45 $ 55,022 100,000 5.14 CCC/B3 Credit Suisse First Boston Mortgage Securities Corp., Floating Rate Note, 10/15/39 (144A) 92,773 200,000 3.76 NR/NR FREMF Mortgage Trust, Floating Rate Note, 2/25/45 (144A) 203,349 175,000 4.04 NR/NR FREMF Mortgage Trust, Floating Rate Note, 5/25/45 (144A) 169,888 --------------- $ 521,032 --------------- Total Real Estate $ 521,032 ----------------------------------------------------------------------------------------------------------------- GOVERNMENT -- 0.0%+ Government -- 0.0%+ 345,549 1.05 NR/NR Government National Mortgage Association, Floating Rate Note, 3/16/53 $ 29,418 --------------- Total Government $ 29,418 ----------------------------------------------------------------------------------------------------------------- TOTAL COLLATERALIZED MORTGAGE OBLIGATIONS (Cost $9,216,320) $ 9,553,982 ----------------------------------------------------------------------------------------------------------------- CORPORATE BONDS -- 57.9% ENERGY -- 11.6% Oil & Gas Drilling -- 1.7% 845,000 B/B3 Drill Rigs Holdings, Inc., 6.5%, 10/1/17 (144A) $ 853,450 400,000 CCC+/Caa3 Ocean Rig UDW, Inc., 9.5%, 4/27/16 (144A) 420,000 600,000 B-/B3 Offshore Group Investment, Ltd., 7.5%, 11/1/19 (144A) 636,000 905,000 B/B1 Shelf Drilling Holdings, Ltd., 8.625%, 11/1/18 (144A) 959,300 650,000 BB-/B2 Unit Corp., 6.625%, 5/15/21 680,875 --------------- $ 3,549,625 ----------------------------------------------------------------------------------------------------------------- Oil & Gas Equipment & Services -- 0.9% 280,000 B+/B2 Basic Energy Services, Inc., 7.75%, 10/15/22 $ 288,400 300,000 B+/B2 Basic Energy Services, Inc., 7.75%, 2/15/19 306,750 150,000 BB/Ba3 Bristow Group, Inc., 6.25%, 10/15/22 162,000 100,000 B+/B1 Calfrac Holdings LP, 7.5%, 12/1/20 (144A) 100,375 The accompanying notes are an integral part of these financial statements. 26 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Oil & Gas Equipment & Services -- (continued) 100,000 B/Caa1 Forbes Energy Services, Ltd., 9.0%, 6/15/19 $ 97,000 120,000 B-/B3 Hiland Partners LP, 7.25%, 10/1/20 (144A) 131,100 400,000 BB-/B1 Key Energy Services, Inc., 6.75%, 3/1/21 417,000 245,000 B/B3 Seitel, Inc., 9.5%, 4/15/19 (144A) 245,919 --------------- $ 1,748,544 ----------------------------------------------------------------------------------------------------------------- Oil & Gas Exploration & Production -- 6.6% 185,000 B+/B2 Antero Resources Finance Corp., 6.0%, 12/1/20 (144A) $ 193,325 235,000 CCC+/Caa1 Aurora USA Oil & Gas, Inc., 7.5%, 4/1/20 (144A) 237,350 650,000 B-/B3 Carrizo Oil & Gas, Inc., 7.5%, 9/15/20 693,875 100,000 B-/B3 Chaparral Energy, Inc., 8.25%, 9/1/21 113,250 700,000 B-/B3 Comstock Resources, Inc., 7.75%, 4/1/19 738,500 205,000 B-/B3 Comstock Resources, Inc., 9.5%, 6/15/20 224,475 100,000 BB+/B1 Concho Resources, Inc., 6.5%, 1/15/22 109,000 285,000 BB/B1 Denbury Resources, Inc., 4.625%, 7/15/23 275,025 225,000 B/B2 EP Energy LLC, 7.75%, 9/1/22 248,625 100,000 B/B2 EP Energy LLC, 9.375%, 5/1/20 115,500 590,000 B-/Caa1 EPL Oil & Gas, Inc., 8.25%, 2/15/18 (144A) 625,400 250,000 B-/B3 EV Energy Partners LP, 8.0%, 4/15/19 263,750 685,000 B-/B2 Forest Oil Corp., 7.5%, 9/15/20 (144A) 722,671 200,000 B/NR GeoPark Latin America, Ltd. Agencia en Chile, 7.5%, 2/11/20 (144A) 208,000 600,000 CCC/Caa1 Goodrich Petroleum Corp., 8.875%, 3/15/19 621,000 690,000 CCC+/B3 Gulfport Energy Corp., 7.75%, 11/1/20 (144A) 727,950 120,000 CCC+/B3 Halcon Resources Corp., 8.875%, 5/15/21 (144A) 129,300 400,000 CCC+/B3 Halcon Resources Corp., 9.75%, 7/15/20 (144A) 442,000 250,000 B-/B3 Kodiak Oil & Gas Corp., 5.5%, 1/15/21 (144A) 261,875 100,000 B-/B3 Kodiak Oil & Gas Corp., 8.125%, 12/1/19 113,000 150,000 B-/Caa1 Midstates Petroleum Co, Inc., 10.75%, 10/1/20 (144A) 166,500 100,000 B+/NR MIE Holdings Corp., 9.75%, 5/12/16 (144A) 107,750 The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 27 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Oil & Gas Exploration & Production -- (continued) 400,000 NR/NR National JSC Naftogaz of Ukraine, 9.5%, 9/30/14 $ 410,480 150,000 BBB-/Ba1 Newfield Exploration Co., 5.625%, 7/1/24 154,875 800,000 B-/Caa1 Northern Oil and Gas, Inc., 8.0%, 6/1/20 834,000 200,000 B/B3 Oasis Petroleum, Inc., 6.875%, 1/15/23 220,000 175,000 B-/B3 PDC Energy, Inc., 7.75%, 10/15/22 (144A) 185,500 100,000 B-/B3 Penn Virginia Corp., 7.25%, 4/15/19 99,750 860,000 CCC+/Caa1 PetroBakken Energy, Ltd., 8.625%, 2/1/20 (144A) 877,200 300,000 BB+/Ba1 QEP Resources, Inc., 5.25%, 5/1/23 307,500 140,000 B-/Caa1 QR Energy LP, 9.25%, 8/1/20 148,400 50,000 CCC+/B3 Quicksilver Resources, Inc., 8.25%, 8/1/15 49,188 400,000 BB/Ba3 Range Resources Corp., 5.0%, 3/15/23 (144A) 409,000 290,000 B-/B3 Samson Investment Co., 9.75%, 2/15/20 (144A) 308,125 700,000 B-/B2 SandRidge Energy, Inc., 7.5%, 2/15/23 726,250 150,000 B-/B3 Stone Energy Corp., 7.5%, 11/15/22 163,875 100,000 B-/B3 Stone Energy Corp., 8.625%, 2/1/17 108,000 200,000 B+/B3 Swift Energy Co., 7.875%, 3/1/22 209,000 420,000 CCC+/Caa1 Talos Production LLC, 9.75%, 2/15/18 (144A) 415,800 CAD 620,000 B/NR Trilogy Energy Corp., 7.25%, 12/13/19 (144A) 634,302 100,000 B/B3 W&T Offshore, Inc., 8.5%, 6/15/19 108,750 --------------- $ 13,708,116 ----------------------------------------------------------------------------------------------------------------- Oil & Gas Refining & Marketing -- 0.2% 215,000 BB+/Ba1 Tesoro Corp., 5.375%, 10/1/22 $ 224,138 90,000 BB-/B2 Western Refining, Inc., 6.25%, 4/1/21 (144A) 92,025 --------------- $ 316,163 ----------------------------------------------------------------------------------------------------------------- Oil & Gas Storage & Transportation -- 1.2% 575,000 B/B1 Copano Energy LLC, 7.125%, 4/1/21 $ 664,125 200,000 BBB-/Baa3 DCP Midstream Operating LP, 4.95%, 4/1/22 218,355 100,000 7.00 BBB-/Baa2 Enterprise Products Operating LLC, Floating Rate Note, 6/1/67 108,000 105,000 B/B1 Genesis Energy LP, 5.75%, 2/15/21 (144A) 108,412 The accompanying notes are an integral part of these financial statements. 28 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Oil & Gas Storage & Transportation -- (continued) NOK 2,000,000 7.07 NR/NR Golar LNG Partners LP, Floating Rate Note, 10/12/17 $ 348,544 200,000 BB/B1 Inergy Midstream LP, 6.0%, 12/15/20 (144A) 208,000 61,000 BB/Ba3 MarkWest Energy Partners LP, 6.25%, 6/15/22 65,728 585,000 BB+/Ba3 Sabine Pass Liquefaction LLC, 5.625%, 2/1/21 (144A) 606,938 100,000 BBB-/Baa3 Sunoco Logistics Partners Operations LP, 6.1%, 2/15/42 113,531 100,000 BBB-/Baa3 The Williams Companies, Inc., 7.75%, 6/15/31 124,593 --------------- $ 2,566,226 ----------------------------------------------------------------------------------------------------------------- Coal & Consumable Fuels -- 1.0% 325,000 B/B2 Bumi Investment Pte, Ltd., 10.75%, 10/6/17 (144A) $ 274,625 250,000 NR/B1 Indo Energy Finance II BV, 6.375%, 1/24/23 (144A) 256,875 250,000 CCC+/B3 James River Coal Co., 7.875%, 4/1/19 120,000 700,000 B/B3 Murray Energy Corp., 10.25%, 10/15/15 (144A) 702,625 EURO 400,000 B-/NR New World Resources NV, 7.875%, 1/15/21 (144A) 461,574 300,000 BB-/B1 SunCoke Energy Partners LP, 7.375%, 2/1/20 (144A) 315,750 --------------- $ 2,131,449 --------------- Total Energy $ 24,020,123 ----------------------------------------------------------------------------------------------------------------- MATERIALS -- 6.1% Commodity Chemicals -- 0.9% 500,000 BB/Ba3 Axiall Corp., 4.875%, 5/15/23 (144A) $ 508,750 110,000 B-/NR Hexion US Finance Corp., 6.625%, 4/15/20 (144A) 110,275 700,000 CCC+/B3 Hexion US Finance Corp., 8.875%, 2/1/18 724,500 550,000 BB-/B1 Rain CII Carbon LLC, 8.25%, 1/15/21 (144A) 594,000 --------------- $ 1,937,525 ----------------------------------------------------------------------------------------------------------------- Diversified Chemicals -- 0.2% 125,000 BB/Ba2 Celanese US Holdings LLC, 5.875%, 6/15/21 $ 136,250 175,000 CCC+/Caa1 INEOS Group Holdings SA, 8.5%, 2/15/16 (144A) 177,625 The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 29 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Diversified Chemicals -- (continued) 90,000 B/B2 Orion Engineered Carbons Bondco GmbH, 9.625%, 6/15/18 (144A) $ 100,125 --------------- $ 414,000 ----------------------------------------------------------------------------------------------------------------- Fertilizers & Agricultural Chemicals -- 0.1% 200,000 NR/Baa3 Phosagro OAO via Phosagro Bond Funding, Ltd., 4.204%, 2/13/18 (144A) $ 199,250 ----------------------------------------------------------------------------------------------------------------- Specialty Chemicals -- 0.2% 570,000 BB-/B2 Tronox Finance LLC, 6.375%, 8/15/20 (144A) $ 552,900 ----------------------------------------------------------------------------------------------------------------- Construction Materials -- 0.3% 550,000 B/NR Cemex SAB de CV, 5.875%, 3/25/19 (144A) $ 555,500 ----------------------------------------------------------------------------------------------------------------- Metal & Glass Containers -- 0.6% 485,000 B-/B3 AEP Industries, Inc., 8.25%, 4/15/19 $ 527,438 118,080 CCC+/Caa1 ARD Finance SA, 11.125%, 6/1/18 (144A) (PIK) 128,707 EURO 100,000 CCC+/B3 Ardagh Glass Finance Plc, 8.75%, 2/1/20 (144A) 133,985 200,000 B+/Ba3 Ardagh Packaging Finance Plc, 4.875%, 11/15/22 (144A) 197,500 EURO 150,000 B+/Ba3 Ardagh Packaging Finance Plc, 7.375%, 10/15/17 (144A) 207,708 --------------- $ 1,195,338 ----------------------------------------------------------------------------------------------------------------- Paper Packaging -- 0.5% 200,000 B+/Ba3 Cascades, Inc., 7.875%, 1/15/20 $ 215,000 100,000 CCC+/Caa2 Exopack Holding Corp., 10.0%, 6/1/18 99,500 340,000 B/B3 Packaging Dynamics Corp., 8.75%, 2/1/16 (144A) 355,725 235,000 BB-/B1 Sealed Air Corp., 5.25%, 4/1/23 (144A) 235,881 115,000 BB-/B1 Sealed Air Corp., 6.875%, 7/15/33 (144A) 109,250 --------------- $ 1,015,356 ----------------------------------------------------------------------------------------------------------------- Aluminum -- 0.1% 150,000 BBB-/Baa3 Alcoa, Inc., 6.15%, 8/15/20 $ 163,314 ----------------------------------------------------------------------------------------------------------------- Diversified Metals & Mining -- 1.0% 500,000 B/B3 Global Brass & Copper, Inc., 9.5%, 6/1/19 (144A) $ 553,750 400,000 BB+/Ba1 Gold Fields Orogen Holding BVI, Ltd., 4.875%, 10/7/20 (144A) 393,000 75,000 BB-/B1 KGHM International, Ltd., 7.75%, 6/15/19 (144A) 78,750 The accompanying notes are an integral part of these financial statements. 30 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Diversified Metals & Mining -- (continued) 100,000 CCC/Caa2 Midwest Vanadium Pty, Ltd., 11.5%, 2/15/18 (144A) $ 63,000 400,000 B-/Caa1 Mirabela Nickel, Ltd., 8.75%, 4/15/18 (144A) 365,000 100,000 CCC+/B3 Molycorp, Inc., 10.0%, 6/1/20 98,500 265,000 B/Caa1 Prince Mineral Holding Corp., 11.5%, 12/15/19 (144A) 296,138 200,000 BB/Ba3 Vedanta Resources Plc, 8.25%, 6/7/21 (144A) 228,000 --------------- $ 2,076,138 ----------------------------------------------------------------------------------------------------------------- Gold -- 0.3% 200,000 BB/Ba3 Eldorado Gold Corp., 6.125%, 12/15/20 (144A) $ 207,500 380,000 BB-/B1 IAMGOLD Corp., 6.75%, 10/1/20 (144A) 365,750 --------------- $ 573,250 ----------------------------------------------------------------------------------------------------------------- Steel -- 1.0% 100,000 B/B3 Essar Steel Algoma, Inc., 9.375%, 3/15/15 (144A) $ 96,000 500,000 B/Caa1 Ferrexpo Finance Plc, 7.875%, 4/7/16 (144A) 498,750 320,000 B/B3 JMC Steel Group, Inc., 8.25%, 3/15/18 (144A) 339,200 100,000 NR/B3 Metinvest BV, 10.25%, 5/20/15 (144A) 105,720 500,000 NR/B3 Metinvest BV, 8.75%, 2/14/18 (144A) 511,500 150,000 B-/B3 Permian Holdings, Inc., 10.5%, 1/15/18 (144A) 154,500 95,000 BB+/Ba2 Steel Dynamics, Inc., 5.25%, 4/15/23 (144A) 96,306 120,000 BB+/Ba2 Steel Dynamics, Inc., 6.125%, 8/15/19 (144A) 129,600 120,000 BB+/Ba2 Steel Dynamics, Inc., 6.375%, 8/15/22 (144A) 129,600 --------------- $ 2,061,176 ----------------------------------------------------------------------------------------------------------------- Paper Products -- 0.9% 250,000 BB/Ba2 Clearwater Paper Corp., 4.5%, 2/1/23 (144A) $ 245,000 500,000 B+/B1 Grupo Papelero Scribe SA de CV, 8.875%, 4/7/20 (144A) 486,250 120,000 BB+/Ba1 PH Glatfelter Co., 5.375%, 10/15/20 125,700 The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 31 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Paper Products -- (continued) 400,000 BB/Ba2 Sappi Papier Holding GmbH, 6.625%, 4/15/21 (144A) $ 413,000 630,000 B-/Caa1 Unifrax I LLC, 7.5%, 2/15/19 (144A) 648,900 --------------- $ 1,918,850 --------------- Total Materials $ 12,662,597 ----------------------------------------------------------------------------------------------------------------- CAPITAL GOODS -- 4.9% Aerospace & Defense -- 0.4% 150,000 BB/Ba2 Bombardier, Inc., 6.125%, 1/15/23 (144A) $ 155,625 465,000 BB/B1 DigitalGlobe, Inc., 5.25%, 2/1/21 (144A) 462,094 150,000 CCC+/Caa1 Silver II Borrower, 7.75%, 12/15/20 (144A) 159,750 --------------- $ 777,469 ----------------------------------------------------------------------------------------------------------------- Building Products -- 0.2% 250,000 BB-/B2 Gibraltar Industries, Inc., 6.25%, 2/1/21 (144A) $ 265,000 50,000 BBB-/Ba3 Masco Corp., 5.95%, 3/15/22 56,242 135,000 BBB-/Ba3 Masco Corp., 7.125%, 3/15/20 157,601 --------------- $ 478,843 ----------------------------------------------------------------------------------------------------------------- Construction & Engineering -- 0.6% 600,000 B+/B2 Abengoa Finance SAU, 8.875%, 11/1/17 (144A) $ 585,000 150,000 B+/B1 Empresas ICA SAB de CV, 8.375%, 7/24/17 (144A) 160,500 200,000 B+/B1 Empresas ICA SAB de CV, 8.9%, 2/4/21 (144A) 214,760 200,000 BB-/NR OAS Investments GmbH, 8.25%, 10/19/19 (144A) 215,000 --------------- $ 1,175,260 ----------------------------------------------------------------------------------------------------------------- Electrical Components & Equipment -- 0.3% EURO 300,000 B+/Ba2 Belden, Inc., 5.5%, 4/15/23 (144A) $ 383,683 200,000 B/B3 Coleman Cable, Inc., 9.0%, 2/15/18 216,500 100,000 B/B3 WireCo WorldGroup, Inc., 9.5%, 5/15/17 104,500 --------------- $ 704,683 ----------------------------------------------------------------------------------------------------------------- Industrial Conglomerates -- 0.5% 200,000 BB-/Ba2 Boart Longyear Management Pty, Ltd., 7.0%, 4/1/21 (144A) $ 206,500 100,000 B-/NR Cia Latinoamericana de Infraestructura & Servicios SA, 9.5%, 12/15/16 66,750 The accompanying notes are an integral part of these financial statements. 32 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Industrial Conglomerates -- (continued) 500,000 B+/B2 JB Poindexter & Co., Inc., 9.0%, 4/1/22 (144A) $ 522,500 150,000 CCC+/B3 Park-Ohio Industries, Inc., 8.125%, 4/1/21 163,125 --------------- $ 958,875 ----------------------------------------------------------------------------------------------------------------- Construction & Farm Machinery & Heavy Trucks -- 0.7% 200,000 B/B2 Commercial Vehicle Group, Inc., 7.875%, 4/15/19 $ 203,000 350,000 A/Baa1 Cummins, Inc., 5.65%, 3/1/98 356,226 400,000 CCC+/B3 Navistar International Corp., 8.25%, 11/1/21 407,500 450,000 B+/B3 Terex Corp., 6.0%, 5/15/21 473,625 --------------- $ 1,440,351 ----------------------------------------------------------------------------------------------------------------- Industrial Machinery -- 1.2% 400,000 B-/B3 BC Mountain LLC, 7.0%, 2/1/21 (144A) $ 424,000 275,000 B/B2 Cleaver-Brooks, Inc., 8.75%, 12/15/19 (144A) 296,656 475,000 B/B2 Constellation Enterprises LLC, 10.625%, 2/1/16 (144A) 498,750 100,000 B/Caa2 Liberty Tire Recycling, 11.0%, 10/1/16 (144A) 99,000 400,000 CCC+/Caa2 Mueller Water Products, Inc., 7.375%, 6/1/17 411,500 200,000 B+/NR WPE International Cooperatief UA, 10.375%, 9/30/20 (144A) 186,000 598,000 B/B3 Xerium Technologies, Inc., 8.875%, 6/15/18 572,585 --------------- $ 2,488,491 ----------------------------------------------------------------------------------------------------------------- Trading Companies & Distributors -- 1.0% 200,000 BB+/Ba3 Aircastle, Ltd., 6.25%, 12/1/19 $ 218,500 200,000 BB+/NR Aviation Capital Group Corp., 4.625%, 1/31/18 (144A) 206,336 200,000 BB+/NR Aviation Capital Group Corp., 6.75%, 4/6/21 (144A) 222,411 100,000 BB+/NR Aviation Capital Group Corp., 7.125%, 10/15/20 (144A) 113,559 220,000 B/B2 Avis Budget Car Rental LLC, 5.5%, 4/1/23 (144A) 219,450 EURO 150,000 B/B2 Avis Budget Finance Plc, 6.0%, 3/1/21 (144A) 196,207 175,000 B+/B3 H&E Equipment Services, Inc., 7.0%, 9/1/22 (144A) 192,500 The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 33 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Trading Companies & Distributors -- (continued) 97,000 B-/B3 INTCOMEX, Inc., 13.25%, 12/15/14 $ 99,910 600,000 BB/Ba3 Rexel SA, 5.25%, 6/15/20 (144A) 607,500 --------------- $ 2,076,373 --------------- Total Capital Goods $ 10,100,345 ----------------------------------------------------------------------------------------------------------------- COMMERCIAL SERVICES & SUPPLIES -- 0.7% Diversified Support Services -- 0.6% 100,000 B/Caa1 ADS Tactical, Inc., 11.0%, 4/1/18 (144A) $ 99,250 415,000 B+/B1 Iron Mountain, Inc., 5.75%, 8/15/24 414,481 725,000 B+/B3 NANA Development Corp., 9.5%, 3/15/19 (144A) 734,062 --------------- $ 1,247,793 ----------------------------------------------------------------------------------------------------------------- Security & Alarm Services -- 0.1% 150,000 B+/B1 The Geo Group, Inc., 5.125%, 4/1/23 (144A) $ 151,500 --------------- Total Commercial Services & Supplies $ 1,399,293 ----------------------------------------------------------------------------------------------------------------- TRANSPORTATION -- 1.4% Air Freight & Logistics -- 0.1% 200,000 B-/B1 CEVA Group Plc, 8.375%, 12/1/17 (144A) $ 206,000 ----------------------------------------------------------------------------------------------------------------- Airlines -- 0.2% 33,609 BB+/Ba2 Continental Airlines 1997-4 Class B Pass Through Trust, 6.9%, 1/2/17 $ 34,732 49,861 BB-/Ba1 Continental Airlines 2001-1 Class B Pass Through Trust, 7.373%, 12/15/15 52,419 400,000 BB+/Ba3 Delta Air Lines 2010-1 Class B Pass Through Trust, 6.375%, 1/2/16 417,000 --------------- $ 504,151 ----------------------------------------------------------------------------------------------------------------- Marine -- 0.3% 560,000 B+/B3 Navios South American Logistics, Inc., 9.25%, 4/15/19 $ 602,000 ----------------------------------------------------------------------------------------------------------------- Trucking -- 0.7% 650,000 BB-/Ba3 Aeropuertos Dominicanos Siglo XXI SA, 9.25%, 11/13/19 $ 706,875 150,000 BBB-/Baa2 Asciano Finance, Ltd., 5.0%, 4/7/18 (144A) 164,556 150,000 B/B3 Syncreon Global Ireland, Ltd., 9.5%, 5/1/18 (144A) 159,375 100,000 B/B3 Syncreon Global Ireland, Ltd., 9.5%, 5/1/18 (144A) 106,250 The accompanying notes are an integral part of these financial statements. 34 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Trucking -- (continued) 325,000 BBB/A3 Transnet SOC, Ltd., 4.0%, 7/26/22 (144A) $ 311,188 --------------- $ 1,448,244 ----------------------------------------------------------------------------------------------------------------- Airport Services -- 0.1% 91,000 B-/B3 Aeropuertos Argentina 2000 SA, 10.75%, 12/1/20 (144A) $ 84,175 100,000 B/B2 Aguila 3 SA, 7.875%, 1/31/18 (144A) 107,250 --------------- $ 191,425 --------------- Total Transportation $ 2,951,820 ----------------------------------------------------------------------------------------------------------------- AUTOMOBILES & COMPONENTS -- 0.5% Auto Parts & Equipment -- 0.2% 400,000 B/Caa1 International Automotive Components Group SA, 9.125%, 6/1/18 (144A) $ 396,000 100,000 B+/B2 Pittsburgh Glass Works LLC, 8.5%, 4/15/16 (144A) 101,750 --------------- $ 497,750 ----------------------------------------------------------------------------------------------------------------- Tires & Rubber -- 0.2% 200,000 BB-/B2 Cooper Tire & Rubber Co., 8.0%, 12/15/19 $ 230,500 210,000 B+/B1 The Goodyear Tire & Rubber Co., 7.0%, 5/15/22 221,288 --------------- $ 451,788 ----------------------------------------------------------------------------------------------------------------- Automobile Manufacturers -- 0.1% 100,000 B/B1 Chrysler Group LLC, 8.25%, 6/15/21 $ 111,625 --------------- Total Automobiles & Components $ 1,061,163 ----------------------------------------------------------------------------------------------------------------- CONSUMER DURABLES & APPAREL -- 1.4% Home Furnishings -- 0.1% 205,000 B+/B3 Tempur-Pedic International, Inc., 6.875%, 12/15/20 (144A) $ 218,838 ----------------------------------------------------------------------------------------------------------------- Homebuilding -- 0.7% 500,000 BB-/B2 Brookfield Residential Properties, Inc., 6.5%, 12/15/20 (144A) $ 535,000 100,000 NR/Ba3 Desarrolladora Homex SAB de CV, 9.5%, 12/11/19 (144A) 85,500 55,000 NR/Ba3 Desarrolladora Homex SAB de CV, 9.75%, 3/25/20 (144A) 47,025 200,000 B/B2 KB Home, 8.0%, 3/15/20 230,500 245,000 BB-/Ba3 Lennar Corp., 4.75%, 11/15/22 (144A) 240,100 95,000 BB-/B1 The Ryland Group, Inc., 5.375%, 10/1/22 97,138 The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 35 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Homebuilding -- (continued) 200,000 NR/B2 Urbi Desarrollos Urbanos SAB de CV, 9.5%, 1/21/20 (144A) $ 122,000 --------------- $ 1,357,263 ----------------------------------------------------------------------------------------------------------------- Household Appliances -- 0.2% 400,000 BB+/NR Arcelik AS, 5.0%, 4/3/23 (144A) $ 398,811 ----------------------------------------------------------------------------------------------------------------- Housewares & Specialties -- 0.4% 425,000 CCC+/Caa2 Reynolds Group Issuer, Inc., 8.25%, 2/15/21 $ 437,750 330,000 CCC+/Caa2 Reynolds Group Issuer, Inc., 9.875%, 8/15/19 361,762 --------------- $ 799,512 ----------------------------------------------------------------------------------------------------------------- Leisure Products -- 0.0%+ EURO 100,000 CCC/Caa2 Heckler & Koch GmbH, 9.5%, 5/15/18 (144A) $ 113,150 --------------- Total Consumer Durables & Apparel $ 2,887,574 ----------------------------------------------------------------------------------------------------------------- CONSUMER SERVICES -- 1.3% Casinos & Gaming -- 0.5% 395,000 CCC/Caa3 Codere Finance Luxembourg SA, 9.25%, 2/15/19 (144A) $ 284,400 EURO 200,000 8.25 BB/Ba2 Lottomatica Group S.p.A., Floating Rate Note, 3/31/66 (144A) 268,687 250,000 B+/B3 MGM Resorts International, 6.75%, 10/1/20 (144A) 265,000 100,000 BB-/B1 Scientific Games International, Inc., 9.25%, 6/15/19 110,125 --------------- $ 928,212 ----------------------------------------------------------------------------------------------------------------- Hotels, Resorts & Cruise Lines -- 0.2% 200,000 CCC+/B2 Seven Seas Cruises S de RL LLC, 9.125%, 5/15/19 $ 216,500 210,000 B+/B3 Viking Cruises, Ltd., 8.5%, 10/15/22 (144A) 231,000 --------------- $ 447,500 ----------------------------------------------------------------------------------------------------------------- Leisure Facilities -- 0.3% EURO 550,000 B+/B3 Cirsa Funding Luxembourg SA, 8.75%, 5/15/18 (144A) $ 689,316 ----------------------------------------------------------------------------------------------------------------- Specialized Consumer Services -- 0.3% 250,000 BB-/Ba3 Coinstar, Inc., 6.0%, 3/15/19 (144A) $ 255,625 260,000 BB/Ba3 Sotheby's, 5.25%, 10/1/22 (144A) 262,600 --------------- $ 518,225 --------------- Total Consumer Services $ 2,583,253 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 36 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- MEDIA -- 1.7% Advertising -- 0.2% 90,000 B/B3 MDC Partners, Inc., 11.0%, 11/1/16 (144A) $ 99,900 295,000 B-/B3 MDC Partners, Inc., 6.75%, 4/1/20 (144A) 297,950 --------------- $ 397,850 ----------------------------------------------------------------------------------------------------------------- Broadcasting -- 1.2% 475,000 BB-/B1 CCO Holdings LLC, 5.75%, 9/1/23 (144A) $ 476,188 100,000 BB-/B1 CCO Holdings LLC, 6.5%, 4/30/21 105,750 450,000 CCC+/B3 Cumulus Media Holdings, Inc., 7.75%, 5/1/19 462,375 67,213 CCC+/Caa3 Intelsat Luxembourg SA, 11.5%, 2/4/17 71,380 350,000 CCC+/Caa3 Intelsat Luxembourg SA, 7.75%, 6/1/21 (144A) 356,125 EURO 200,000 B+/B1 Nara Cable Funding II, Ltd., 8.5%, 3/1/20 (144A) 268,610 EURO 100,000 B+/B1 Nara Cable Funding, Ltd., 8.875%, 12/1/18 (144A) 134,305 325,000 B+/B2 Quebecor Media, Inc., 5.75%, 1/15/23 (144A) 331,500 150,000 B+/B2 Univision Communications, Inc., 6.875%, 5/15/19 (144A) 160,500 100,000 CCC+/Caa2 Univision Communications, Inc., 8.5%, 5/15/21 (144A) 108,000 --------------- $ 2,474,733 ----------------------------------------------------------------------------------------------------------------- Cable & Satellite -- 0.1% 200,000 BB/B1 Sirius XM Radio, Inc., 5.25%, 8/15/22 (144A) $ 204,500 ----------------------------------------------------------------------------------------------------------------- Movies & Entertainment -- 0.2% 100,000 CCC+/Caa1 Production Resource Group, Inc., 8.875%, 5/1/19 $ 75,750 75,000 B-/B3 Regal Entertainment Group, 5.75%, 2/1/25 73,688 190,000 BB-/Ba2 WMG Acquisition Corp., 6.0%, 1 /15/21 (144A) 199,025 --------------- $ 348,463 ----------------------------------------------------------------------------------------------------------------- Publishing -- 0.0%+ 100,000 B-/B3 MPL 2 Acquisition Canco, Inc., 9.875%, 8/15/18 (144A) $ 100,750 --------------- Total Media $ 3,526,296 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 37 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- RETAILING -- 0.5% Department Stores -- 0.1% 100,000 B/NR Grupo Famsa SAB de CV, 11.0%, 7/20/15 (144A) $ 107,000 ----------------------------------------------------------------------------------------------------------------- Apparel Retail -- 0.1% 250,000 B/B3 Brown Shoe Co., Inc., 7.125%, 5/15/19 $ 263,750 ----------------------------------------------------------------------------------------------------------------- Specialty Stores -- 0.3% 600,000 B-/B3 Radio Systems Corp., 8.375%, 11/1/19 (144A) $ 634,500 --------------- Total Retailing $ 1,005,250 ----------------------------------------------------------------------------------------------------------------- FOOD, BEVERAGE & TOBACCO -- 2.3% Soft Drinks -- 0.1% 195,000 BB/Ba2 Central American Bottling Corp., 6.75%, 2/9/22 (144A) $ 212,306 ----------------------------------------------------------------------------------------------------------------- Agricultural Products -- 0.5% 240,000 BB/Ba2 Cosan Luxembourg SA, 5.0%, 3/14/23 (144A) $ 241,440 750,000 B/NR Tonon Bioenergia SA, 9.25%, 1/24/20 (144A) 765,000 --------------- $ 1,006,440 ----------------------------------------------------------------------------------------------------------------- Packaged Foods & Meats -- 1.5% 75,000 B/NR Agrokor DD, 8.875%, 2/1/20 (144A) $ 82,312 550,000 B/B1 Chiquita Brands International, Inc., 7.875%, 2/1/21 (144A) 576,812 300,000 B/B3 FAGE Dairy Industry SA, 9.875%, 2/1/20 (144A) 329,250 200,000 B+/B2 Marfrig Holding Europe BV, 8.375%, 5/9/18 (144A) 180,500 200,000 B+/B2 Marfrig Holding Europe BV, 9.875%, 7/24/17 (144A) 195,000 100,000 B+/B2 Marfrig Overseas, Ltd., 9.5%, 5/4/20 (144A) 94,500 500,000 B/NR MHP SA, 8.25%, 4/2/20 (144A) 495,445 400,000 B+/B1 Minerva Luxembourg SA, 7.75%, 1/31/23 (144A) 429,000 360,000 B/Caa1 Pilgrim's Pride Corp., 7.875%, 12/15/18 389,250 200,000 B+/B1 Post Holdings, Inc., 7.375%, 2/15/22 218,750 70,000 B+/B2 Wells Enterprises, Inc., 6.75%, 2/1/20 (144A) 73,850 --------------- $ 3,064,669 ----------------------------------------------------------------------------------------------------------------- Tobacco -- 0.2% 500,000 B-/B3 Alliance One International, Inc., 10.0%, 7/15/16 $ 528,125 --------------- Total Food, Beverage & Tobacco $ 4,811,540 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 38 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- HOUSEHOLD & PERSONAL PRODUCTS -- 0.5% Personal Products -- 0.5% 255,000 B+/B2 Albea Beauty Holdings SA, 8.375%, 11/1/19 (144A) $ 271,575 750,000 BBB-/Baa2 Avon Products, Inc., 5.0%, 3/15/23 769,552 --------------- $ 1,041,127 --------------- Total Household & Personal Products $ 1,041,127 ----------------------------------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 1.6% Health Care Equipment -- 0.3% 250,000 B+/B1 Accellent, Inc., 8.375%, 2/1/17 $ 265,625 200,000 BB/B2 Hologic, Inc., 6.25%, 8/1/20 212,750 150,000 B+/B2 Physio-Control International, Inc., 9.875%, 1/15/19 (144A) 169,125 --------------- $ 647,500 ----------------------------------------------------------------------------------------------------------------- Health Care Supplies -- 0.1% 100,000 B/Caa1 ConvaTec Healthcare E SA, 10.5%, 12/15/18 (144A) $ 111,250 100,000 B-/Caa1 Immucor, Inc., 11.125%, 8/15/19 114,000 --------------- $ 225,250 ----------------------------------------------------------------------------------------------------------------- Health Care Services -- 0.2% 400,000 CCC+/Caa2 Gentiva Health Services, Inc., 11.5%, 9/1/18 $ 411,000 75,000 CCC+/Caa2 Rural Metro Corp., 10.125%, 7/15/19 (144A) 76,312 --------------- $ 487,312 ----------------------------------------------------------------------------------------------------------------- Health Care Facilities -- 0.7% 350,000 BB/B1 Aviv Healthcare Properties LP, 7.75%, 2/15/19 $ 376,250 200,000 B/B3 Capella Healthcare, Inc., 9.25%, 7/1/17 216,500 215,000 B/B3 CHS, 7.125%, 7/15/20 233,275 400,000 B-/B3 Kindred Healthcare, Inc., 8.25%, 6/1/19 397,000 200,000 B-/B3 Vanguard Health Holding Co. II LLC, 7.75%, 2/1/19 214,000 --------------- $ 1,437,025 ----------------------------------------------------------------------------------------------------------------- Health Care Technology -- 0.3% 200,000 CCC+/Caa1 Emdeon, Inc., 11.0%, 12/31/19 $ 230,500 170,000 B/B3 IMS Health, Inc., 6.0%, 11/1/20 (144A) 177,225 175,000 B-/B3 MedAssets, Inc., 8.0%, 11/15/18 191,188 --------------- $ 598,913 --------------- Total Health Care Equipment & Services $ 3,396,000 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 39 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 0.8% Biotechnology -- 0.4% 600,000 B+/Caa2 Lantheus Medical Imaging, Inc., 9.75%, 5/15/17 $ 595,500 130,000 BB/B3 Warner Chilcott Co. LLC, 7.75%, 9/15/18 138,938 --------------- $ 734,438 ----------------------------------------------------------------------------------------------------------------- Pharmaceuticals -- 0.4% 610,000 B-/Caa1 Sky Growth Acquisition Corp., 7.375%, 10/15/20 (144A) $ 645,075 55,000 BB-/B1 Valeant Pharmaceuticals International, 6.375%, 10/15/20 (144A) 57,991 155,000 BB-/B1 VPI Escrow Corp., 6.375%, 10/15/20 (144A) 163,331 --------------- $ 866,397 --------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 1,600,835 ----------------------------------------------------------------------------------------------------------------- BANKS -- 2.4% Diversified Banks -- 1.7% 500,000 NR/Baa3 Banco de Bogota SA, 5.375%, 2/19/23 (144A) $ 515,000 400,000 6.25 BB/NR Banco do Brasil SA, Floating Rate Note, 12/29/49 (Perpetual) (144A) 394,000 200,000 NR/B1 Banco GNB Sudameris SA, 7.5%, 7/30/22 (144A) 220,965 300,000 BBB-/Baa3 Bank of India London, 3.625%, 9/21/18 (144A) 301,123 250,000 BBB/NR BBVA Banco Continental SA, 5.0%, 8/26/22 (144A) 263,125 400,000 NR/Baa2 BBVA Bancomer SA Texas, 6.5%, 3/10/21 (144A) 454,000 350,000 NR/Ba3 CorpGroup Banking SA, 6.75%, 3/15/23 (144A) 366,188 300,000 BBB+/Baa2 Intesa Sanpaolo S.p.A., 6.5%, 2/24/21 (144A) 309,123 100,000 BBB/A3 Macquarie Bank, Ltd., 6.625%, 4/7/21 (144A) 111,744 250,000 A/Baa1 Nordea Bank AB, 4.25%, 9/21/22 (144A) 255,694 300,000 BBB-/Baa2 VTB Bank OJSC Via VTB Capital SA, 6.95%, 10/17/22 (144A) 316,050 --------------- $ 3,507,012 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 40 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Regional Banks -- 0.7% 250,000 A/A2 HSBC Bank USA NA New York NY, 6.0%, 8/9/17 $ 292,993 400,000 8.25 BBB/Baa3 PNC Financial Services Group, Inc., Floating Rate Note, 5/29/49 (Perpetual) 402,439 150,000 6.75 BBB/Baa3 PNC Financial Services Group, Inc., Floating Rate Note, 7/29/49 (Perpetual) 171,561 500,000 BBB-/NR UBS AG, 7.625%, 8/17/22 558,730 --------------- $ 1,425,723 ----------------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- 0.0%+ 100,000 BBB-/Baa2 Astoria Financial Corp., 5.0%, 6/19/17 $ 107,086 --------------- Total Banks $ 5,039,821 ----------------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 6.7% Other Diversified Financial Services -- 3.9% 500,000 NR/NR Caelus Re, Ltd., Floating Rate Note, 4/7/17 (Cat Bond) (144A) $ 500,000 500,000 0.00 BB-/NR Caelus Re, Ltd., Floating Rate Note, 3/7/16 (Cat Bond) (144A) 499,600 500,000 5.95 BB/B1 Citigroup, Inc., Floating Rate Note, 12/29/49 (Perpetual) 518,750 250,000 10.25 BB-/NR Compass Re, Ltd., Floating Rate Note, 1/8/15 (Cat Bond) (144A) 259,025 250,000 11.25 B+/NR Compass Re, Ltd., Floating Rate Note, 1/8/15 (Cat Bond) (144A) 254,525 500,000 NR/NR DTEK Finance Plc, 7.875%, 4/4/18 (144A) 491,849 250,000 9.00 BB/NR East Lane Re V, Ltd., Floating Rate Note, 3/16/16 (Cat Bond) (144A) 270,225 250,000 6.60 BB-/NR Embarcadero Reinsurance, Ltd., Floating Rate Note, 8/4/14 (Cat Bond) (144A) 254,225 1,000,000 BBB/NR Fixed Income Trust Series 2013-A, 0.0%, 10/15/97 (Step) (144A) (c) 590,748 200,000 7.12 AA-/Baa1 General Electric Capital Corp., Floating Rate Note, 12/29/49 (Perpetual) 232,613 200,000 A/A2 JPMorgan Chase & Co., 4.35%, 8/15/21 220,635 100,000 7.90 BBB/Ba1 JPMorgan Chase & Co., Floating Rate Note (Perpetual) 114,883 500,000 A-/NR KKR Group Finance Co. II LLC, 5.5%, 2/1/43 (144A) 481,535 250,000 6.00 BB/NR Lodestone Re, Ltd., Floating Rate Note, 1/8/14 (Cat Bond) (144A) 252,175 250,000 7.25 BB/NR Lodestone Re, Ltd., Floating Rate Note, 1/8/14 (Cat Bond) (144A) 252,400 500,000 6.25 BB/NR Lodestone Re, Ltd., Floating Rate Note, 5/17/13 (Cat Bond) (144A) 501,800 The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 41 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Other Diversified Financial Services -- (continued) 450,000 BB/NR Magnesita Finance, Ltd., 8.625%, 4/29/49 (Perpetual) (144A) $ 476,995 250,000 7.50 BB-/NR Queen Street IV Capital, Ltd., Floating Rate Note, 4/9/15 (Cat Bond) (144A) 252,350 250,000 8.50 B+/NR Queen Street V Re, Ltd., Floating Rate Note, 4/9/15 (Cat Bond) (144A) 256,525 300,000 6.25 BB/NR Residential Reinsurance 2010, Ltd., Floating Rate Note, 6/6/13 (Cat Bond) (144A) 302,880 250,000 10.75 NR/NR Residential Reinsurance 2010, Ltd., Floating Rate Note, 6/6/13 (Cat Bond) (144A) 253,525 250,000 NR/NR Sector Re V, Ltd., 3/1/18 (Cat Bond) (144A) 250,000 100,000 7.70 BBB/NR Tiers Trust, Floating Rate Note, 10/15/97 (144A) 65,626 300,000 NR/NR Unison Ground Lease Funding LLC, 5.78%, 3/16/20 (144A) 300,000 250,000 2.90 BBB-/NR Vita Capital V, Ltd., Floating Rate Note, 1/15/17 (Cat Bond) (144A) 255,525 --------------- $ 8,108,414 ----------------------------------------------------------------------------------------------------------------- Specialized Finance -- 1.1% 400,000 BB/Ba3 Ausdrill Finance Pty, Ltd., 6.875%, 11/1/19 (144A) $ 409,000 500,000 BBB-/WR Cantor Fitzgerald LP, 7.875%, 10/15/19 (144A) 519,826 200,000 CCC+/Caa1 Igloo Holdings Corp., 8.25%, 12/15/17 (144A) (PIK) 206,500 250,000 5.25 BB+/NR Kibou, Ltd., Floating Rate Note, 2/16/15 (Cat Bond) (144A) 258,725 400,000 B+/B2 Nationstar Mortgage LLC, 6.5%, 7/1/21 (144A) 417,000 400,000 B/B1 Oxford Finance LLC, 7.25%, 1/15/18 (144A) 415,000 --------------- $ 2,226,051 ----------------------------------------------------------------------------------------------------------------- Consumer Finance -- 0.1% 150,000 CCC/Caa1 Springleaf Finance Corp., 6.9%, 12/15/17 $ 150,750 100,000 NR/NR Tarjeta Naranja SA, 9.0%, 1/28/17 (144A) 90,000 --------------- $ 240,750 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 42 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Asset Management & Custody Banks -- 0.4% 250,000 A/NR Blackstone Holdings Finance Co. LLC, 4.75%, 2/15/23 (144A) $ 275,896 250,000 A/NR Blackstone Holdings Finance Co. LLC, 6.25%, 8/15/42 (144A) 283,925 100,000 BB+/Ba1 Neuberger Berman Group LLC, 5.625%, 3/15/20 (144A) 104,750 250,000 BBB/NR Prospect Capital Corp., 5.875%, 3/15/23 250,474 --------------- $ 915,045 ----------------------------------------------------------------------------------------------------------------- Investment Banking & Brokerage -- 1.2% 100,000 4.00 BB+/Ba2 Goldman Sachs Capital II, Floating Rate Note, 6/1/43 $ 84,125 500,000 BBB/Baa3 Jefferies Group LLC, 5.125%, 1/20/23 529,388 150,000 A-/Baa2 Merrill Lynch & Co., Inc., 5.0%, 2/3/14 155,199 200,000 BBB+/Baa3 Merrill Lynch & Co., Inc., 7.75%, 5/14/38 266,556 250,000 BBB+/Baa2 Morgan Stanley, 4.875%, 11/1/22 265,028 900,000 NR/Baa3 Scottrade Financial Services, Inc., 6.125%, 7/11/21 (144A) 936,346 150,000 A-/A3 The Goldman Sachs Group, Inc., 5.25%, 7/27/21 169,960 --------------- $ 2,406,602 --------------- Total Diversified Financials $ 13,896,862 ----------------------------------------------------------------------------------------------------------------- INSURANCE -- 6.8% Insurance Brokers -- 1.0% 600,000 CCC+/Caa2 Hub International, Ltd., 8.125%, 10/15/18 (144A) $ 631,500 700,000 BBB-/Baa3 Ironshore Holdings US, Inc., 8.5%, 5/15/20 (144A) 801,391 500,000 CCC/Caa2 Onex USI Acquisition Corp., 7.75%, 1/15/21 (144A) 501,250 GBP 100,000 NR/Ba3 Towergate Finance Plc, 8.5%, 2/15/18 (144A) 158,720 --------------- $ 2,092,861 ----------------------------------------------------------------------------------------------------------------- Life & Health Insurance -- 0.9% 650,000 B+/Ba3 CNO Financial Group, Inc., 6.375%, 10/1/20 (144A) $ 691,438 500,000 B+/B1 Fidelity & Guaranty Life Holdings, Inc., 6.375%, 4/1/21 (144A) 510,000 125,000 5.20 BBB+/Baa3 Prudential Financial, Inc., Floating Rate Note, 3/15/44 125,312 400,000 5.88 BBB+/Baa3 Prudential Financial, Inc., Floating Rate Note, 9/15/42 426,000 The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 43 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Life & Health Insurance -- (continued) 165,000 5.88 NR/NR Wilton Re Finance LLC, Floating Rate Note, 3/30/33 (144A) $ 166,664 --------------- $ 1,919,414 ----------------------------------------------------------------------------------------------------------------- Multi-line Insurance -- 0.6% 250,000 BBB/A3 AXA SA, 8.6%, 12/15/30 $ 320,570 500,000 6.46 BBB-/Baa1 AXA SA, Floating Rate Note (Perpetual) (144A) 496,250 300,000 BBB-/Baa3 Genworth Financial, Inc., 7.2%, 2/15/21 349,500 --------------- $ 1,166,320 ----------------------------------------------------------------------------------------------------------------- Property & Casualty Insurance -- 0.9% 250,000 BBB-/Baa3 Fidelity National Financial, Inc., 5.5%, 9/1/22 $ 283,799 200,000 NR/Baa3 First American Financial Corp., 4.3%, 2/1/23 208,145 200,000 BBB-/Baa2 OneBeacon US Holdings, Inc., 4.6%, 11/9/22 209,335 110,000 7.51 BB+/Ba2 Sirius International Group, Ltd., Floating Rate Note (Perpetual) (144A) 116,425 400,000 BBB-/Baa3 The Hanover Insurance Group, Inc., 7.625%, 10/15/25 467,148 550,000 6.50 BBB-/Ba1 XL Group Plc, Floating Rate Note (Perpetual) 537,625 --------------- $ 1,822,477 ----------------------------------------------------------------------------------------------------------------- Reinsurance -- 3.4% 250,000 14.00 B-/NR Blue Fin, Ltd., Floating Rate Note, 5/28/13 (Cat Bond) (144A) $ 253,375 250,000 10.00 NR/Ba2 Combine Re, Ltd., Floating Rate Note, 1/7/15 (Cat Bond) (144A) 268,475 250,000 0.00 B/NR Everglades Re, Ltd., Floating Rate Note, 3/28/16 (Cat Bond) (144A) 254,275 1,000,000 17.75 B+/NR Everglades Re, Ltd., Floating Rate Note, 4/30/14 (Cat Bond) (144A) 1,092,400 350,000 5.00 BB+/NR Foundation Re III, Ltd., Floating Rate Note, 2/25/15 (Cat Bond) 365,050 250,000 5.75 BB/NR Foundation Re III, Ltd., Floating Rate Note, 2/3/14 (Cat Bond) (144A) 253,175 250,000 6.00 BB+/NR Longpoint Re, Ltd., Floating Rate Note, 6/12/15 (Cat Bond) (144A) 260,450 250,000 12.18 B/NR Montana Re, Ltd., Floating Rate Note, 1/8/14 (Cat Bond) (144A) 246,000 250,000 9.00 BB/NR Mystic Re, Ltd., Floating Rate Note, 3/12/15 (Cat Bond) (144A) 261,900 250,000 12.00 B/NR Mystic Re, Ltd., Floating Rate Note, 3/12/15 (Cat Bond) (144A) 264,800 The accompanying notes are an integral part of these financial statements. 44 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Reinsurance -- (continued) 250,000 8.71 B+/NR Mythen Re, Ltd. Series 2012-2 Class A, Floating Rate Note, 1/5/17 (Cat Bond) (144A) $ 252,375 250,000 11.94 B-/NR Mythen Re, Ltd. Series 2012-2 Class A, Floating Rate Note, 11/10/16 (Cat Bond) (144A) 246,425 250,000 11.22 NR/B2 Mythen, Ltd., Floating Rate Note, 5/7/15 (Cat Bond) (144A) 265,275 250,000 13.75 NR/NR Pelican Re, Ltd., Floating Rate Note, 4/13/15 (Cat Bond) (144A) 262,725 250,000 6.75 BBB-/Baa3 Reinsurance Group of America, Inc., Floating Rate Note, 12/15/65 252,500 250,000 12.75 NR/NR Residential Reinsurance 2012, Ltd., Floating Rate Note, 12/6/16 (Cat Bond) (144A) 253,500 250,000 8.00 BB/NR Residential Reinsurance 2012, Ltd., Floating Rate Note, 6/6/16 (Cat Bond) (144A) 263,475 250,000 12.93 B-/NR Successor X, Ltd. Class III-R3, Floating Rate Note, 1/7/14 (Cat Bond) (144A) 251,100 250,000 13.00 NR/NR Successor X, Ltd. Class IV-AL3, Floating Rate Note, 2/25/14 (Cat Bond) (144A) 251,150 500,000 9.41 B/NR Successor X, Ltd. Class IV-E3, Floating Rate Note, 2/25/14 (Cat Bond) (144A) 502,450 250,000 11.25 B-/NR Successor X, Ltd., Floating Rate Note, 11/10/15 (Cat Bond) (144A) 251,925 250,000 16.75 NR/NR Successor X, Ltd., Floating Rate Note, 4/4/13 (Cat Bond) (144A) 250,550 200,000 BBB+/Baa2 Validus Holdings, Ltd., 8.875%, 1/26/40 266,866 --------------- $ 7,090,216 --------------- Total Insurance $ 14,091,288 ----------------------------------------------------------------------------------------------------------------- REAL ESTATE -- 0.6% Diversified REITs -- 0.3% 300,000 B+/Ba3 CNL Lifestyle Properties, Inc., 7.25%, 4/15/19 $ 300,000 250,000 BBB/Baa2 Goodman Funding Pty, Ltd., 6.375%, 4/15/21 (144A) 289,349 --------------- $ 589,349 ----------------------------------------------------------------------------------------------------------------- Specialized REITs -- 0.3% 250,000 BBB-/Baa2 Hospitality Properties Trust, 5.0%, 8/15/22 $ 266,401 100,000 BB-/B1 Sabra Health Care LP, 8.125%, 11/1/18 108,625 150,000 BBB/Baa2 Ventas Realty LP, 4.75%, 6/1/21 166,701 --------------- $ 541,727 --------------- Total Real Estate $ 1,131,076 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 45 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- SOFTWARE & SERVICES -- 0.7% Internet Software & Services -- 0.5% 100,000 BB/Ba3 Equinix, Inc., 7.0%, 7/15/21 $ 111,000 805,000 BB/B1 j2 Global, Inc., 8.0%, 8/1/20 857,325 --------------- $ 968,325 ----------------------------------------------------------------------------------------------------------------- Data Processing & Outsourced Services -- 0.2% 100,000 B-/Caa1 First Data Corp., 8.25%, 1/15/21 (144A) $ 104,000 400,000 BB/Ba3 WEX, Inc., 4.75%, 2/1/23 (144A) 387,000 --------------- $ 491,000 --------------- Total Software & Services $ 1,459,325 ----------------------------------------------------------------------------------------------------------------- TECHNOLOGY HARDWARE & EQUIPMENT -- 0.9% Communications Equipment -- 0.3% 250,000 BB+/B1 Brocade Communications Systems, Inc., 4.625%, 1/15/23 (144A) $ 241,875 260,000 B/B3 CommScope, Inc., 8.25%, 1/15/19 (144A) 282,100 100,000 B+/B1 ViaSat, Inc., 6.875%, 6/15/20 107,250 --------------- $ 631,225 ----------------------------------------------------------------------------------------------------------------- Computer Hardware -- 0.1% 185,000 BB/Ba3 NCR Corp., 5.0%, 7/15/22 (144A) $ 185,462 ----------------------------------------------------------------------------------------------------------------- Computer Storage & Peripherals -- 0.1% 200,000 BB+/Ba1 Seagate HDD Cayman, 7.0%, 11/1/21 $ 217,000 ----------------------------------------------------------------------------------------------------------------- Electronic Equipment Manufacturers -- 0.3% 550,000 BB-/B1 Viasystems, Inc., 7.875%, 5/1/19 (144A) $ 574,750 ----------------------------------------------------------------------------------------------------------------- Electronic Manufacturing Services -- 0.1% 85,000 BB+/Ba1 Flextronics International, Ltd., 4.625%, 2/15/20 (144A) $ 85,850 145,000 BB+/Ba1 Flextronics International, Ltd., 5.0%, 2/15/23 (144A) 144,638 --------------- $ 230,488 --------------- Total Technology Hardware & Equipment $ 1,838,925 ----------------------------------------------------------------------------------------------------------------- SEMICONDUCTORS & SEMICONDUCTOR EQUIPMENT -- 0.5% Semiconductor Equipment -- 0.3% 650,000 B+/Caa1 MEMC Electronic Materials, Inc., 7.75%, 4/1/19 $ 601,250 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 46 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Semiconductors -- 0.2% 445,000 B/B2 Advanced Micro Devices, Inc., 7.5%, 8/15/22 (144A) $ 403,838 --------------- Total Semiconductors & Semiconductor Equipment $ 1,005,088 ----------------------------------------------------------------------------------------------------------------- TELECOMMUNICATION SERVICES -- 2.4% Integrated Telecommunication Services -- 2.2% 500,000 BB/Ba2 CenturyLink, Inc., 6.45%, 6/15/21 $ 530,000 150,000 BB/Ba2 CenturyLink, Inc., 7.6%, 9/15/39 145,500 300,000 BB/Ba2 CenturyLink, Inc., 7.65%, 3/15/42 289,875 578,000 B/B1 Cincinnati Bell, Inc., 8.375%, 10/15/20 601,120 250,000 BB-/Ba2 Frontier Communications Corp., 7.625%, 4/15/24 257,188 500,000 BB-/Ba2 Frontier Communications Corp., 8.75%, 4/15/22 556,250 200,000 BB-/Ba2 Frontier Communications Corp., 9.0%, 8/15/31 206,500 155,000 NR/Ba3 GTP Acquisition Partners I LLC, 7.628%, 6/15/16 (144A) 172,242 500,000 BB-/NR Lynx I Corp., 5.375%, 4/15/21 (144A) 520,000 150,000 BB-/Ba3 MasTec, Inc., 4.875%, 3/15/23 148,500 200,000 A/A2 Qtel International Finance, Ltd., 3.875%, 1/31/28 (144A) 196,958 125,000 BBB/Baa2 Telefonica Emisiones SAU, 6.221%, 7/3/17 139,860 EURO 200,000 B+/Ba3 Telenet Finance III Luxembourg SCA, 6.625%, 2/15/21 (144A) 267,328 100,000 BB-/B1 tw telecom holdings inc, 5.375%, 10/1/22 104,250 305,000 B/Ba3 Windstream Corp., 7.5%, 6/1/22 326,350 --------------- $ 4,461,921 ----------------------------------------------------------------------------------------------------------------- Wireless Telecommunication Services -- 0.2% 150,000 B/B3 Intelsat Jackson Holdings SA, 7.5%, 4/1/21 $ 166,875 100,000 B/B1 MetroPCS Wireless, Inc., 7.875%, 9/1/18 109,250 200,000 BB/Ba3 VimpelCom Holdings BV, 7.504%, 3/1/22 (144A) 222,560 --------------- $ 498,685 --------------- Total Telecommunication Services $ 4,960,606 ----------------------------------------------------------------------------------------------------------------- UTILITIES -- 1.3% Electric Utilities -- 0.5% 100,000 CCC/NR Cia de Transporte de Energia Electrica en Alta Tension Transener SA, 9.75%, 8/15/21 (144A) $ 42,750 The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 47 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Electric Utilities -- (continued) 500,000 5.25 BBB+/A3 Electricite de France SA, Floating Rate Note, 1/29/49 (Perpetual) (144A) $ 496,720 150,000 BBB+/Baa2 Enel Finance International NV, 5.125%, 10/7/19 (144A) 159,142 75,000 6.25 BBB-/Baa2 Southern California Edison Co., Floating Rate Note, 8/1/49 (Perpetual) 82,521 400,000 CCC/Caa3 Texas Competitive Electric Holdings Co. LLC, 11.5%, 10/1/20 (144A) 299,000 --------------- $ 1,080,133 ----------------------------------------------------------------------------------------------------------------- Gas Utilities -- 0.1% 165,000 NR/Ba2 AmeriGas Finance LLC, 7.0%, 5/20/22 $ 179,438 ----------------------------------------------------------------------------------------------------------------- Independent Power Producers & Energy Traders -- 0.7% 250,000 5.75 BB+/NR East Lane Re, Ltd., Floating Rate Note, 3/14/14 (Cat Bond) (144A) $ 255,075 100,000 NR/B1 Inkia Energy, Ltd., 8.375%, 4/4/21 (144A) 112,950 400,000 B/B1 InterGen NV, 9.0%, 6/30/17 (144A) 393,000 150,000 BB-/B1 NRG Energy, Inc., 7.625%, 5/15/19 162,000 200,000 BB-/B1 NRG Energy, Inc., 8.25%, 9/1/20 225,750 300,000 BB-/B1 NRG Energy, Inc., 8.5%, 6/15/19 329,250 --------------- $ 1,478,025 --------------- Total Utilities $ 2,737,596 ----------------------------------------------------------------------------------------------------------------- GOVERNMENT -- 0.3% Government -- 0.3% 500,000 NR/NR Brazil Minas SPE via State of Minas Gerais, 5.333%, 2/15/28 $ 550,000 --------------- Total Government $ 550,000 ----------------------------------------------------------------------------------------------------------------- TOTAL CORPORATE BONDS (Cost $116,909,229) $ 119,757,803 ----------------------------------------------------------------------------------------------------------------- FOREIGN GOVERNMENT BONDS -- 0.2% 100,000 B-/Caa1 Provincia de Buenos Aires Argentina, 10.875%, 1/26/21 (144A) $ 69,000 200,000 B/B3 Ukraine Government International Bond, 7.8%, 11/28/22 (144A) 202,500 200,000 B/B3 Ukraine Government International Bond, 9.25%, 7/24/17 (144A) 216,520 ----------------------------------------------------------------------------------------------------------------- TOTAL FOREIGN GOVERNMENT BONDS (Cost $494,421) $ 488,020 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 48 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- MUNICIPAL BONDS -- 1.1% Municipal Airport -- 0.6% 1,250,000 NR/NR City of Charlotte North Carolina, 5.6%, 7/1/27 $ 1,251,400 ----------------------------------------------------------------------------------------------------------------- Municipal General -- 0.3% 500,000 AA/A2 JobsOhio Beverage System, 3.985%, 1/1/29 $ 512,780 75,000 AA/A2 JobsOhio Beverage System, 4.532%, 1/1/35 77,841 --------------- $ 590,621 ----------------------------------------------------------------------------------------------------------------- Municipal Medical -- 0.1% 100,000 AA-/A1 Massachusetts Development Finance Agency, 5.25%, 4/1/37 $ 111,908 150,000 A/NR New Hampshire Health & Education Facilities Authority, 6.5%, 1/1/41 173,598 --------------- $ 285,506 ----------------------------------------------------------------------------------------------------------------- Municipal Pollution -- 0.1% 100,000 B+/B1 County of York South Carolina, 5.7%, 1/1/24 $ 99,998 ----------------------------------------------------------------------------------------------------------------- TOTAL MUNICIPAL BONDS (Cost $2,142,908) $ 2,227,525 ----------------------------------------------------------------------------------------------------------------- SENIOR FLOATING RATE LOAN INTERESTS -- 14.0%** ENERGY -- 0.9% Oil & Gas Drilling -- 0.4% 400,000 0.00 NR/B3 Offshore Group Investment, Ltd., Term Loan, 3/28/19 $ 403,000 299,250 0.00 B+/Ba1 Shelf Drilling Holdings, Ltd., Term Loan, 5/30/18 302,242 --------------- $ 705,242 ----------------------------------------------------------------------------------------------------------------- Oil & Gas Equipment & Services -- 0.2% 300,000 0.00 BB-/NR American Petroleum Tankers Parent LLC, Term Loan, 9/15/19 $ 300,750 25,090 8.50 CCC+/B3 FTS International Services LLC, Term Loan, 5/6/16 23,908 --------------- $ 324,658 ----------------------------------------------------------------------------------------------------------------- Integrated Oil & Gas -- 0.0%+ 65,580 4.50 BBB/Baa2 Glenn Pool Oil & Gas Trust, Term Loan, 6/1/16 $ 65,908 ----------------------------------------------------------------------------------------------------------------- Oil & Gas Exploration & Production -- 0.3% 200,000 5.75 BB-/Ba3 Chesapeake Energy Corp., Term Loan, 12/2/17 $ 206,536 The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 49 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Oil & Gas Exploration & Production -- (continued) 265,000 5.00 B+/Ba3 EP Energy LLC, Tranche B-1 Loan, 5/24/18 $ 268,431 200,000 6.00 B/B1 Samson Investment Co., Initial Term Loan (Second Lien), 9/25/18 202,900 --------------- $ 677,867 --------------- Total Energy $ 1,773,675 ----------------------------------------------------------------------------------------------------------------- MATERIALS -- 1.1% Commodity Chemicals -- 0.0%+ 49,501 4.25 BB-/B1 Taminco Global Chemical Corp., Tranche B-2 Dollar Term Loan, 2/15/19 $ 50,089 ----------------------------------------------------------------------------------------------------------------- Diversified Chemicals -- 0.1% 133,650 6.50 NR/B1 Ineos Group Holdings, Ltd., Cash Dollar Term Loan, 5/4/18 $ 135,947 98,738 5.00 B+/B2 Univar, Term B Loan, 2/14/17 99,840 --------------- $ 235,787 ----------------------------------------------------------------------------------------------------------------- Specialty Chemicals -- 0.2% 399,000 4.50 NR/NR PQ Corp., 2013 Term Loan, 8/7/17 $ 403,738 ----------------------------------------------------------------------------------------------------------------- Metal & Glass Containers -- 0.3% 399,000 4.50 B/B1 BWAY Holding Co., Initial Term Loan, 8/31/17 $ 404,237 219,676 4.25 B/B1 Tank Holdings Corp., Initial Term Loan, 6/8/19 220,363 --------------- $ 624,600 ----------------------------------------------------------------------------------------------------------------- Paper Packaging -- 0.1% 98,250 6.50 B/B2 Exopack Holding Corp., Term Loan B, 5/6/17 $ 99,355 ----------------------------------------------------------------------------------------------------------------- Diversified Metals & Mining -- 0.2% 298,874 5.25 BB+/Ba1 Fortescue Metals Group, Ltd., Term Loan, 9/18/17 $ 302,770 153,063 0.00 B+/B2 Preferred Sands Holding Co. LLC, Term B Loan, 12/15/16 143,113 30,410 4.00 BB+/Ba1 SunCoke Energy, Inc., Tranche B Term Loan, 7/26/18 30,562 --------------- $ 476,445 ----------------------------------------------------------------------------------------------------------------- Steel -- 0.2% 124,375 8.75 B/B1 Essar Steel Algoma, Inc., Term Loan, 9/12/14 $ 127,484 148,487 4.75 BB/B1 JMC Steel Group, Inc., Term Loan, 2/15/17 150,063 --------------- $ 277,547 --------------- Total Materials $ 2,167,561 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 50 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- CAPITAL GOODS -- 1.6% Aerospace & Defense -- 0.4% 104,000 3.75 BBB-/Ba2 DigitalGlobe, Inc., Term Loan, 1/25/20 $ 105,341 162,379 3.54 BB-/B2 Hunter Defense Technologies, Inc., Term Loan, 8/22/14 151,825 448,875 5.25 B/B1 Sequa Corp., Initial Term Loan, 12/19/17 456,543 --------------- $ 713,709 ----------------------------------------------------------------------------------------------------------------- Building Products -- 0.2% 109,450 5.75 B/B1 CPG International I, Inc., Term Loan, 9/21/19 $ 110,476 249,438 6.00 B+/B2 Custom Building Products, Inc., Term Loan, 12/12/19 253,803 124,688 4.25 B+/B1 Unifrax Corp., New Term B Loan, 12/31/19 126,090 --------------- $ 490,369 ----------------------------------------------------------------------------------------------------------------- Electrical Components & Equipment -- 0.1% 248,125 7.00 NR/NR Pelican Products, Inc., Term Loan (First Lien), 8/15/18 $ 248,745 49,750 6.00 BB-/Ba2 WireCo WorldGroup, Inc., Term Loan, 4/13/17 50,496 --------------- $ 299,241 ----------------------------------------------------------------------------------------------------------------- Industrial Conglomerates -- 0.3% 300,000 0.00 NR/NR Milacron LLC, Term Loan, 3/12/20 $ 303,000 347,808 5.00 B+/B2 Pro Mach, Inc., Term Loan, 7/16/17 352,155 --------------- $ 655,155 ----------------------------------------------------------------------------------------------------------------- Construction & Farm Machinery & Heavy Trucks -- 0.4% 319,500 7.00 B+/Ba3 Navistar International Corp., Tranche B T erm Loan, 7/31/17 $ 323,721 147,758 4.50 NR/Ba2 Terex Corp., New US Term Loan, 4/28/17 150,011 332,767 5.75 B+/B2 Waupaca Foundry, Inc., Term Loan, 6/29/17 337,759 --------------- $ 811,491 ----------------------------------------------------------------------------------------------------------------- Industrial Machinery -- 0.1% 198,500 8.25 BB-/B3 Wastequip, Inc., Term Loan, 5/17/18 $ 199,492 ----------------------------------------------------------------------------------------------------------------- Trading Companies & Distributors -- 0.1% 234,413 4.50 B+/Ba3 WESCO International, Inc., Tranche B-1 Loan, 12/4/19 $ 237,020 --------------- Total Capital Goods $ 3,406,477 ----------------------------------------------------------------------------------------------------------------- COMMERCIAL SERVICES & SUPPLIES -- 0.6% Commercial Printing -- 0.1% 197,975 7.00 BB-/Ba3 Cenveo Corp., Term B Facility, 12/15/16 $ 199,088 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 51 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Environmental & Facilities Services -- 0.3% 400,000 0.00 NR/NR ISS AS, New Term B Loan, 3/26/18 $ 402,376 158,400 5.50 B+/B1 WCA Waste Corp., Term Loan, 3/23/18 159,885 --------------- $ 562,261 ----------------------------------------------------------------------------------------------------------------- Diversified Support Services -- 0.1% 185,875 10.00 NR/NR IAP Worldwide Services, Inc., Term Loan (First Lien), 12/31/15 $ 139,406 ----------------------------------------------------------------------------------------------------------------- Security & Alarm Services -- 0.0%+ 124,688 4.50 BB/Ba1 Garda World Security Corp., Term B Loan, 10/24/19 $ 126,441 ----------------------------------------------------------------------------------------------------------------- Human Resource & Employment Services -- 0.1% 210,254 5.00 BB-/Ba3 On Assignment, Inc., Initial Term B Loan, 3/20/19 $ 213,142 --------------- Total Commercial Services & Supplies $ 1,240,338 ----------------------------------------------------------------------------------------------------------------- TRANSPORTATION -- 0.3% Air Freight & Logistics -- 0.1% 175,000 0.00 B-/Ba3 Ozburn-Hessey Logistics LLC, Term Loan (First Lien), 4/7/16 $ 175,875 ----------------------------------------------------------------------------------------------------------------- Airlines -- 0.2% 175,000 5.25 B+/Ba2 Delta Air Lines, Inc., Term B-1 Loan, 9/28/18 $ 178,008 250,000 0.00 BB-/Ba2 United Air Lines, Inc., 3/12/19 253,021 --------------- $ 431,029 ----------------------------------------------------------------------------------------------------------------- Trucking -- 0.0%+ 72,997 4.00 NR/NR Swift Transportation Co LLC, Tranche B-2 Term Loan (2013), 12/21/17 $ 74,138 --------------- Total Transportation $ 681,042 ----------------------------------------------------------------------------------------------------------------- AUTOMOBILES & COMPONENTS -- 0.3% Auto Parts & Equipment -- 0.3% 64,675 4.25 BB-/Ba3 Allison Transmission, Inc., Term B-3 Loan, 8/23/19 $ 65,572 167,632 5.00 NR/NR HHI Holdings LLC, Additional Term Loan, 10/5/18 170,356 249,375 5.00 B+/B1 Metaldyne Corp., USD Term Loan, 12/18/18 253,739 129,025 0.00 NR/NR TI Group Automotive Systems LLC, Additional Term Loan, 3/27/19 130,315 62,590 3.75 BB/Ba2 Tomkins LLC, Term B-2 Loan, 9/29/16 63,373 --------------- $ 683,355 --------------- Total Automobiles & Components $ 683,355 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 52 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- CONSUMER DURABLES & APPAREL -- 0.4% Home Furnishings -- 0.1% 149,625 5.00 BB/Ba3 Tempur-Pedic International, Inc., Term B Loan, 9/27/19 $ 151,909 ----------------------------------------------------------------------------------------------------------------- Housewares & Specialties -- 0.1% 84,280 3.75 BB-/Ba2 Prestige Brands, Inc., Term B-1 Loan, 1/31/19 $ 85,629 200,000 5.50 B+/B1 World Kitchen LLC, U.S. Term Loan, 2/13/19 202,750 45,129 5.25 B+/B1 Yankee Candle Co., Inc., Initial Term Loan, 3/2/19 45,651 --------------- $ 334,030 ----------------------------------------------------------------------------------------------------------------- Apparel, Accessories & Luxury Goods -- 0.1% 150,000 5.75 B/B2 Renfro Corp., Tranche B Term Loan, 1/23/19 $ 152,250 ----------------------------------------------------------------------------------------------------------------- Textiles -- 0.1% 237,256 5.75 NR/Ba3 Kloeckner Pentaplast SA, Term B-1 Loan, 12/14/16 $ 241,556 --------------- Total Consumer Durables & Apparel $ 879,745 ----------------------------------------------------------------------------------------------------------------- CONSUMER SERVICES -- 0.8% Casinos & Gaming -- 0.2% 93,750 6.00 BB-/Ba3 Boyd Gaming Corp., Increased Term Loan, 12/17/15 $ 94,855 269,325 4.25 BB/Ba2 MGM Resorts International, Term B Loan, 12/20/19 274,183 --------------- $ 369,038 ----------------------------------------------------------------------------------------------------------------- Hotels, Resorts & Cruise Lines -- 0.1% 246,875 4.75 NR/Ba2 Seven Seas Cruises S de RL LLC, Term B-1 Loan, 12/21/18 $ 250,578 ----------------------------------------------------------------------------------------------------------------- Leisure Facilities -- 0.1% 200,000 5.00 B+/B1 Bombardier Recreational Products, Inc., Term B Loan, 7/17/19 $ 202,229 ----------------------------------------------------------------------------------------------------------------- Restaurants -- 0.3% 77,610 3.75 BB/Ba3 Burger King Corp., Tranche B Term Loan (2012), 9/28/19 $ 78,766 248,435 4.75 B+/B1 Landry's, Inc., B Term Loan, 3/22/18 250,713 272,708 4.50 NR/Ba3 NPC Restaurant Holdings LLC, Term Loan, 12/28/18 277,310 119,400 4.75 BB-/B1 Wendy's International, Inc., Term Loan, 4/3/19 120,849 --------------- $ 727,638 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 53 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Education Services -- 0.1% 149,625 4.00 B+/B1 Bright Horizons Family Solutions, Inc., Term B Loan, 1/14/20 $ 150,997 --------------- Total Consumer Services $ 1,700,480 ----------------------------------------------------------------------------------------------------------------- MEDIA -- 1.0% Advertising -- 0.3% 199,500 0.00 B+/Ba3 Advantage Sales & Marketing LLC, 2013 Term Loan (First Lien), 12/17/17 $ 202,576 396,446 6.50 B/Ba3 Affinion Group, Inc., Tranche B Term Loan, 10/9/16 388,269 --------------- $ 590,845 ----------------------------------------------------------------------------------------------------------------- Broadcasting -- 0.3% 199,500 4.75 B/B1 NEP Broadcasting LLC, Refinanced New Term Loan (First Lien), 1/22/20 $ 201,744 267,975 0.00 NR/Ba3 Telesat Canada, U.S. Term B Loan, 3/28/19 270,486 199,863 4.75 B+/NR Univision Communications, Inc., 2013 Converted Extended First-Lien Term Loan, 2/22/20 201,288 --------------- $ 673,518 ----------------------------------------------------------------------------------------------------------------- Cable & Satellite -- 0.2% 448,121 6.25 B/B1 WideOpenWest LLC, Term Loan, 4/18/18 $ 454,394 ----------------------------------------------------------------------------------------------------------------- Movies & Entertainment -- 0.1% 197,963 4.50 BB-/Ba2 Live Nation Entertainment, Inc., Term B Loan, 10/20/16 $ 199,776 ----------------------------------------------------------------------------------------------------------------- Publishing -- 0.1% 118,550 0.00 B+/Ba3 Interactive Data Corp., Refinanced Term Loan, 2/11/18 $ 120,069 --------------- Total Media $ 2,038,602 ----------------------------------------------------------------------------------------------------------------- RETAILING -- 0.4% Computer & Electronics Retail -- 0.1% 98,250 11.00 B/B2 Targus Group International, Term Loan, 5/12/16 $ 98,741 ----------------------------------------------------------------------------------------------------------------- Home Improvement Retail -- 0.2% 250,000 4.50 B/B1 Apex Tool Group LLC, Term Loan, 2/1/20 $ 253,906 223,276 4.25 B+/WR The Hillman Group, Inc., Term Loan, 5/31/16 225,601 --------------- $ 479,507 ----------------------------------------------------------------------------------------------------------------- Automotive Retail -- 0.1% 199,500 6.25 B+/B1 Sequa Automotive Group, Term Loan, 11/1/18 $ 201,703 --------------- Total Retailing $ 779,951 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 54 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- FOOD & STAPLES RETAILING -- 0.3% Food Distributors -- 0.1% 150,000 4.50 B/B1 Crossmark Holdings, Inc., Term Loan (First Lien), 1/31/20 $ 150,422 ----------------------------------------------------------------------------------------------------------------- Food Retail -- 0.2% 150,000 5.75 NR/NR Albertsons LLC, Term B Loan, 2/14/16 $ 152,746 247,307 5.75 B+/B1 Roundy's Supermarkets, Inc., Tranche B Term Loan, 1/24/19 247,153 --------------- $ 399,899 --------------- Total Food & Staples Retailing $ 550,321 ----------------------------------------------------------------------------------------------------------------- FOOD, BEVERAGE & TOBACCO -- 0.8% Packaged Foods & Meats -- 0.8% 199,500 4.00 B/B1 Del Monte Foods Co., Initial Term Loan, 2/3/18 $ 201,474 248,750 6.50 NR/NR Hearthside Food Solutions LLC, Term Loan A, 5/7/18 251,238 400,000 0.00 BB-/NR HJ Heinz Co., Term B2 Loan, 3/27/20 403,916 680,000 0.00 NR/NR Hostess Brands, Inc., Term B Loan, 2/25/20 695,300 199,496 4.75 B+/Ba3 Pinnacle Foods Finance LLC, Tranche E Term Loan, 9/16/18 201,598 --------------- $ 1,753,526 --------------- Total Food, Beverage & Tobacco $ 1,753,526 ----------------------------------------------------------------------------------------------------------------- HOUSEHOLD & PERSONAL PRODUCTS -- 0.2% Personal Products -- 0.2% 64,350 0.00 NR/NR Monotronics International, Inc., Term B Loan, 3/23/18 $ 63,707 250,000 0.00 BB-/NR NBTY, Inc., Term B-2 Loan, 10/1/17 253,406 --------------- $ 317,113 --------------- Total Household & Personal Products $ 317,113 ----------------------------------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 1.5% Health Care Equipment -- 0.2% 174,125 4.50 BBB-/Ba2 Hologic, Inc., Tranche B Term Loan, 4/29/19 $ 176,755 247,375 5.50 BB-/Ba2 Kinetic Concepts, Inc., Dollar Term C-1 Loan, 5/4/18 252,168 --------------- $ 428,923 ----------------------------------------------------------------------------------------------------------------- Health Care Supplies -- 0.1% 249,375 0.00 BB-/Ba3 Immucor, Inc., Term B-2 Loan, 8/19/18 $ 251,674 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 55 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Health Care Services -- 0.5% 99,750 4.00 BB-/Ba2 DaVita, Inc., Tranche B2 Term Loan, 8/1/19 $ 100,911 299,238 4.00 B+/Ba3 Emergency Medical Services Corp., Initial Term Loan, 4/5/18 301,034 71,802 6.50 B+/B1 Gentiva Health Services, Inc., Term B1 Term Loan, 2/22/16 72,430 133,714 7.75 B/B2 inVentiv Health, Inc., Term B-3 Loan, 6/24/18 132,879 248,764 6.75 B+/Ba3 MModal, Inc., Term B Loan, 8/17/19 239,902 98,496 5.75 B+/B1 Rural Metro Corp., Term Loan (First Lien), 3/28/18 99,247 --------------- $ 946,403 ----------------------------------------------------------------------------------------------------------------- Health Care Facilities -- 0.6% 58,339 0.00 BB-/Ba3 Health Management Associates, Inc., Replacement Term B Loan, 11/18/18 $ 58,896 196,009 4.50 NR/NR IASIS Healthcare LLC, Term B-2 Loan, 5/3/18 199,010 249,375 5.25 B+/Ba3 Kindred Healthcare, Inc., Incremental Term Loan, 6/1/18 252,025 249,375 7.00 NR/NR RegionalCare Hospital Partners, Inc., Term Loan (First Lien 2013), 11/4/18 253,739 98,250 5.50 B+/B1 Select Medical Holdings Corp., Tranche B Term Loan, 4/25/18 99,232 350,000 3.75 NR/NR Vanguard Health Holding Co II LLC, Term B Loan, 1/29/16 354,812 --------------- $ 1,217,714 ----------------------------------------------------------------------------------------------------------------- Managed Health Care -- 0.0%+ 70,000 9.75 B+/B2 MMM Holdings, Inc., Term Loan, 10/9/17 $ 70,525 ----------------------------------------------------------------------------------------------------------------- Health Care Technology -- 0.1% 100,000 5.00 B+/Ba3 Convatec, Inc., Dollar Term Loan, 12/1/16 $ 101,781 148,500 5.00 BB-/Ba3 Emdeon, Inc., Term B-1 Loan, 11/2/18 150,681 --------------- $ 252,462 --------------- Total Health Care Equipment & Services $ 3,167,701 ----------------------------------------------------------------------------------------------------------------- PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 0.4% Biotechnology -- 0.3% 199,000 3.50 BB/B1 Alkermes, Inc., 2019 Term Loan, 9/25/19 $ 200,078 97,995 5.50 BB/B2 Axcan Intermediate Holdings, Inc., Term B-1 Loan, 2/11/17 98,975 122,978 4.25 BB+/Ba2 Grifols, Inc., New U.S. Tranche B Term Loan, 6/1/17 124,416 22,077 4.25 BBB-/Ba3 Warner Chilcott Corp., Additional Term B-1 Loan, 3/15/18 22,409 The accompanying notes are an integral part of these financial statements. 56 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Biotechnology -- (continued) 50,717 4.25 BBB-/Ba3 Warner Chilcott Corp., Term B-1 Loan, 3/3/18 $ 51,478 17,971 4.25 BBB-/Ba3 Warner Chilcott Corp., Term B-2 Loan, 3/17/18 18,241 39,965 4.25 BBB-/Ba3 WC Luxco Sarl, Term B-3 Loan, 3/3/18 40,565 --------------- $ 556,162 ----------------------------------------------------------------------------------------------------------------- Pharmaceuticals -- 0.1% 245,607 11.00 NR/NR K-V Pharmaceutical Co., DIP Facility, 12/28/13 $ 238,239 99,501 4.25 B+/B1 Par Pharmaceutical Companies, Inc., Additional Term B-1 Loan, 9/28/19 100,734 --------------- $ 338,973 --------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 895,135 ----------------------------------------------------------------------------------------------------------------- BANKS -- 0.1% Thrifts & Mortgage Finance -- 0.1% 275,000 5.00 B/B1 Ocwen Financial Corp., Initial Term Loan, 1/15/18 $ 279,812 --------------- Total Banks $ 279,812 ----------------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 0.7% Other Diversified Financial Services -- 0.1% 30,184 5.25 B/B2 BNY ConvergEx Group LLC, Term Loan First Lien (EZE), 12/17/16 $ 30,134 66,677 5.25 B/B2 BNY ConvergEx Group LLC, Term Loan First Lien (TOP), 12/17/16 66,566 98,939 5.25 BB/Ba3 WorldPay, Facility B2A Term Loan, 11/30/17 99,607 --------------- $ 196,307 ----------------------------------------------------------------------------------------------------------------- Multi-Sector Holdings -- 0.1% 249,374 5.50 B/B2 Fox Acquisition Sub LLC, Initial Term Loan, 7/14/17 $ 254,257 ----------------------------------------------------------------------------------------------------------------- Specialized Finance -- 0.3% 229,425 5.25 B/NR DH Services Luxembourg Sarl, Term Loan, 12/18/19 $ 231,767 300,000 0.00 BB-/B1 ROC Finance LLC, New Term Loan B, 3/27/19 302,064 --------------- $ 533,831 ----------------------------------------------------------------------------------------------------------------- Consumer Finance -- 0.1% 250,000 5.50 CCC+/B3 Springleaf Finance Corp., Initial Term Loan, 5/28/17 $ 252,070 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 57 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Investment Banking & Brokerage -- 0.1% 300,000 0.00 NR/B1 Duff & Phelps Corp., 3/14/20 $ 303,562 --------------- Total Diversified Financials $ 1,540,027 ----------------------------------------------------------------------------------------------------------------- INSURANCE -- 0.3% Life & Health Insurance -- 0.1% 95,577 5.00 NR/Ba3 CNO Financial Group, Inc., Tranche B2 Term Loan, 9/4/18 $ 97,189 ----------------------------------------------------------------------------------------------------------------- Property & Casualty Insurance -- 0.2% 299,250 6.50 B-/B2 Confie seguros Holding II Co., Term B Loan (First Lien), 10/11/13 $ 302,617 199,500 5.25 B-/B1 USI Insurance Services LLC, Initial Term Loan, 11/29/19 201,578 --------------- $ 504,195 --------------- Total Insurance $ 601,384 ----------------------------------------------------------------------------------------------------------------- REAL ESTATE -- 0.1% Real Estate Services -- 0.1% 99,750 5.75 BB-/B1 Altisource Portfolio Solutions SA, Term B Loan, 11/1/19 $ 101,620 --------------- Total Real Estate $ 101,620 ----------------------------------------------------------------------------------------------------------------- SOFTWARE & SERVICES -- 0.6% Data Processing & Outsourced Services -- 0.2% 250,000 4.20 B+/B1 First Data Corp., 2018 Dollar Term Loan, 3/24/18 $ 249,656 174,125 4.25 BB+/Ba2 Genpact, Ltd., Term Loan, 8/17/19 176,882 --------------- $ 426,538 ----------------------------------------------------------------------------------------------------------------- Application Software -- 0.4% 261,236 8.50 B/Ba3 Expert Global Solutions, Inc., Term B Advance (First Lien), 3/13/18 $ 263,849 148,500 7.25 NR/B2 HMH Holdings Delaware, Inc., Term Loan (Exit Facility), 11/21/13 149,707 248,128 5.25 B+/Ba3 Lawson Software, Inc., Tranche B2 Term Loan, 4/5/18 252,729 97,996 5.25 B+/B1 Vertafore, Inc., Term Loan (First Lien), 7/31/16 99,037 --------------- $ 765,322 ----------------------------------------------------------------------------------------------------------------- Systems Software -- 0.0%+ 55,388 4.00 NR/Ba2 Rovi Corp., Tranche B2 Term Loan, 3/30/19 $ 55,388 --------------- Total Software & Services $ 1,247,248 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 58 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- TECHNOLOGY HARDWARE & EQUIPMENT -- 0.4% Communications Equipment -- 0.3% 248,750 6.75 B+/B1 Audio Visual Services Corp., Term Loan (First Lien), 10/11/18 $ 250,616 388,032 4.00 BBB-/Ba3 Riverbed Technology, Inc., Term Loan, 10/29/19 392,882 --------------- $ 643,498 ----------------------------------------------------------------------------------------------------------------- Electronic Components -- 0.1% 226,528 6.25 B+/B2 Generac Acquisition Corp., Term Loan, 5/22/19 $ 232,474 --------------- Total Technology Hardware & Equipment $ 875,972 ----------------------------------------------------------------------------------------------------------------- SEMICONDUCTORS & SEMICONDUCTOR EQUIPMENT -- 0.1% Semiconductor Equipment -- 0.0%+ 131,559 5.75 BB-/B1 Aeroflex, Inc., Tranche B Term Loan, 5/9/18 $ 134,135 ----------------------------------------------------------------------------------------------------------------- Semiconductors -- 0.1% 134,104 3.75 BB/Ba2 Microsemi Corp., Term Loan, 2/2/18 $ 135,311 --------------- Total Semiconductors & Semiconductor Equipment $ 269,446 ----------------------------------------------------------------------------------------------------------------- TELECOMMUNICATION SERVICES -- 0.6% Integrated Telecommunication Services -- 0.5% 99,000 6.50 B/B2 Securus Technologies, Inc., Tranche 2 Term Loan (First Lien), 5/31/17 $ 99,248 490,000 0.00 NR/NR Virgin Media Investment Holdings, Ltd., New Term B Loan, 2/6/20 488,162 300,000 0.00 B+/Ba3 West Corp., Term B-8 Loan, 6/30/18 305,250 --------------- $ 892,660 ----------------------------------------------------------------------------------------------------------------- Wireless Telecommunication Services -- 0.1% 49,375 4.00 B+/Ba2 Crown Castle International Corp., Tranche B Term Loan, 1/10/19 $ 50,017 200,000 0.00 BB-/B1 Syniverse Holdings, Inc., Initial Term Loan (2013), 4/23/19 200,500 --------------- $ 250,517 --------------- Total Telecommunication Services $ 1,143,177 ----------------------------------------------------------------------------------------------------------------- UTILITIES -- 0.5% Independent Power Producers & Energy Traders -- 0.5% 448,750 4.00 BB-/B1 Calpine Corp., Term Loan, 9/27/19 $ 452,910 The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 59 Schedule of Investments | 3/31/13 (continued) ----------------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Principal Rate (b) Ratings Amount ($) (unaudited) (unaudited) Value ----------------------------------------------------------------------------------------------------------------- Independent Power Producers & Energy Traders -- (continued) 229,425 4.75 BB+/Ba1 NSG Holdings LLC, New Term Loan, 11/15/19 $ 233,440 300,000 0.00 BB+/Ba2 Ruby Western Pipeline Holdings LLC, Term Loan, 3/27/20 304,125 --------------- $ 990,475 --------------- Total Utilities $ 990,475 ----------------------------------------------------------------------------------------------------------------- TOTAL SENIOR FLOATING RATE LOAN INTERESTS (Cost $28,694,014) $ 29,084,183 ----------------------------------------------------------------------------------------------------------------- TEMPORARY CASH INVESTMENTS -- 13.9% Repurchase Agreement -- 13.9% 28,710,000 NR/Aaa Bank of Nova Scotia, Inc., 0.19%, dated 3/28/13, repurchase price of $20,465,000 plus accrued interest on 4/1/13 collateralized by $29,284,355 Freddie Mac Giant, 3.5-5.5%, 6/1/35-8/1/42 $ 28,710,000 ----------------------------------------------------------------------------------------------------------------- TOTAL TEMPORARY CASH INVESTMENTS (Cost $28,710,000) $ 28,710,000 ----------------------------------------------------------------------------------------------------------------- TOTAL INVESTMENT IN SECURITIES -- 102.4% (Cost $207,695,632) (a) $ 211,828,311 ----------------------------------------------------------------------------------------------------------------- OTHER ASSETS & LIABILITIES -- (2.4)% $ (4,785,657) ----------------------------------------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $ 207,042,654 ================================================================================================================= ----------------------------------------------------------------------------------------------------------------- Notional Unrealized Principal ($) Appreciation ----------------------------------------------------------------------------------------------------------------- CREDIT DEFAULT SWAP AGREEMENTS 250,000 JPMorgan Chase & Co., Goodyear Tire & Rubber, 5.0%, 9/20/17 $ 12,610 250,000 JPMorgan Chase & Co., American Axle & Manufacturing Co., 5.0%, 12/20/17 15,993 --------------- $ 28,603 ----------------------------------------------------------------------------------------------------------------- TOTAL CREDIT DEFAULT SWAP AGREEMENTS (Cost ($16,874)) $ 28,603 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 60 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 * Non-income producing security. + Rounds to less than 0.1%. NR Not rated by either S&P or Moody's. WR Withdrawn rating. REIT Real Estate Investment Trust. (Step) Bond issued with an initial coupon rate which converts to a higher rate at a later date. (Cat Bond) Catastrophe bond is a high-yield debt instrument that is usually insurance linked and meant to raise money in case of a catastrophe. (Perpetual) Security with no stated maturity date. PIK Represents a pay in kind security. (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 March 28, 2013, the value of these securities amounted to $88,340,937 or 42.7% 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 United States banks, (iii) the rate of a certificate of deposit or (iv) other base lending rates used by commercial lenders. The rate shown is the coupon rate at period end. (a) At March 31, 2013, the net unrealized appreciation on investments based on cost for federal income tax purposes of $207,898,439 was as follows: Aggregate gross unrealized appreciation for all investments in which there is an excess of value over tax cost $ 5,266,514 Aggregate gross unrealized depreciation for all investments in which there is an excess of tax cost over value (1,336,642) ----------- Net unrealized appreciation $ 3,929,872 =========== (b) Debt obligation with a variable interest rate. Rate shown is rate at end of period. (c) Security issued with a zero coupon. Income is recognized through accretion of discount. Principal amounts are denominated in U.S. Dollars unless otherwise noted: CAD Canadian Dollar. EURO Euro. GBP British Pound Sterling. NOK Norwegian Krone. Purchases and sales of securities (excluding temporary cash investments) for the year ended March 31, 2013 aggregated $153,982,595 and $24,758,191, respectively. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. Level 1 - quoted prices in active markets for identical securities. Level 2 - other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.) See Notes to Financial Statements -- Note 1A. Level 3 - significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) See Notes to Financial Statements -- Note 1A. The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 61 Schedule of Investments | 3/31/13 (continued) 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 following is a summary of the inputs used as of March 31, 2013, in valuing the Fund's investments: ------------------------------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total ------------------------------------------------------------------------------------------------------- Convertible Corporate Bonds $ -- $ 14,919,609 $ -- $ 14,919,609 Preferred Stock 2,218,357 882,806 -- 3,101,163 Convertible Preferred Stock 128,875 -- -- 128,875 Asset Backed Securities -- 3,857,151 -- 3,857,151 Collateralized Mortgage Obligations -- 9,553,982 -- 9,553,982 Corporate Bonds -- 119,101,429 656,374 119,757,803 Foreign Government Bonds -- 488,020 -- 488,020 Municipal Bonds -- 2,227,525 -- 2,227,525 Senior Floating Rate Loan Interests -- 29,084,183 -- 29,084,183 Repurchase Agreements -- 28,710,000 -- 28,710,000 ------------------------------------------------------------------------------------------------------- Total $ 2,347,232 $ 208,824,705 $ 656,374 $211,828,311 ======================================================================================================= Other Financial Instruments Unrealized appreciation on credit default swaps $ -- $ 28,603 $ -- $ 28,603 Net unrealized depreciation on futures contracts (5,410) -- -- (5,410) Unrealized depreciation on forward foreign currency portfolio hedge contracts -- 110,500 -- 110,500 ------------------------------------------------------------------------------------------------------- Total $ (5,410) $ 139,103 $ -- $ 133,693 ======================================================================================================= During the year ended March 31, 2013, there were no transfers between Levels 1, 2 and 3. Following is a reconciliation of assets using significant unobservable inputs (Level 3): ------------------------------------------------------------------------------------------------------- Corporate Bonds ------------------------------------------------------------------------------------------------------- Balance as of 3/31/12 $ -- Realized gain (loss)1 -- Change in unrealized appreciation (depreciation)2 48,414 Purchases 607,960 Sales -- Transfers in and out of Level 3* -- ------------------------------------------------------------------------------------------------------- Balance as of 3/31/13 $ 656,374 ======================================================================================================= 1 Realized gain (loss) on these securities is included in the net realized gain (loss) from investments in the Statement of Operations. 2 Unrealized appreciation (depreciation) on these securities is included in the change in unrealized appreciation (depreciation) 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. 62 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 Statement of Assets and Liabilities | 3/31/13 ASSETS: Investment in securities (cost $178,985,632) $183,118,311 Repurchase agreements (cost $28,710,000) 28,710,000 ------------------------------------------------------------------------------------------------------------ Total investment in securities (cost $207,695,632) $211,828,311 Cash 3,735,243 Futures Collateral 531,000 Receivables -- Investment securities sold 538,093 Fund shares sold 8,853,221 Interest 2,460,176 Dividends 18,067 Due from Pioneer Investment Management, Inc. 154,154 Unrealized appreciation on forward foreign currency portfolio hedge contracts 110,500 Unrealized appreciation on credit default swaps 28,603 Other 45,712 ------------------------------------------------------------------------------------------------------------- Total assets $228,303,080 ------------------------------------------------------------------------------------------------------------- LIABILITIES: Payables -- Investment securities purchased $ 17,722,559 Fund shares repurchased 610,754 Variation margin 64,650 Dividends 244,644 Due to custodian (cost $2,351,255) 2,307,630 Unrealized depreciation on futures contracts 5,410 Swap premiums received 16,874 Due to affiliates 140,191 Accrued expenses 147,714 ------------------------------------------------------------------------------------------------------------- Total liabilities $ 21,260,426 ------------------------------------------------------------------------------------------------------------- NET ASSETS: Paid-in capital $203,748,613 Distributions in excess of net investment income (431,839) Accumulated net realized loss on investments and foreign currency transactions and futures contracts (582,470) Net unrealized appreciation on investments 4,132,679 Net unrealized appreciation on forward foreign currency contracts and other assets and liabilities denominated in foreign currencies 152,478 Net unrealized appreciation on credit default swaps 28,603 Net unrealized depreciation on futures contracts (5,410) ------------------------------------------------------------------------------------------------------------- Total net assets $207,042,654 ============================================================================================================= NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Class A (based on $47,232,974/4,703,627 shares) $ 10.04 Class C (based on $28,796,479/2,874,381 shares) $ 10.02 Class Y (based on $131,013,201/13,002,660 shares) $ 10.08 MAXIMUM OFFERING PRICE: Class A ($10.04 (divided by) 95.50) $ 10.51 ============================================================================================================= The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 63 Statement of Operations For the Year Ended 3/31/13 INVESTMENT INCOME: Interest $5,480,992 Dividends 79,654 ------------------------------------------------------------------------------------------------------------- Total investment income $5,560,646 ------------------------------------------------------------------------------------------------------------- EXPENSES: Management fees $ 614,276 Transfer agent fees and expenses Class A 3,642 Class C 2,584 Class Y 1,394 Distribution fees Class A 45,180 Class C 83,952 Shareholder communications expense 55,200 Administrative reimbursement 41,791 Custodian fees 53,934 Registration fees 132,279 Professional fees 58,455 Printing expense 33,006 Fees and expenses of nonaffiliated Trustees 6,586 Miscellaneous 66,005 ------------------------------------------------------------------------------------------------------------- Total expenses $1,198,284 Less fees waived and expenses reimbursed by Pioneer Investment Management, Inc. $ (297,593) ------------------------------------------------------------------------------------------------------------- Net expenses $ 900,691 ------------------------------------------------------------------------------------------------------------- Net investment income $4,659,955 ------------------------------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS, CREDIT DEFAULT SWAPS, FUTURES CONTRACTS, AND FOREIGN CURRENCY TRANSACTIONS: Net realized gain (loss) on: Investments $ 775,048 Credit default swaps 11,424 Futures contracts (861,782) Forward foreign currency contracts and other assets and liabilities denominated in foreign currencies (33,579) $ (108,889) ------------------------------------------------------------------------------------------------------------- Change in net unrealized appreciation (depreciation) on: Investments $3,966,470 Futures contracts 61,654 Credit default swaps 28,603 Forward foreign currency contracts and other assets and liabilities denominated in foreign currencies 185,901 $4,242,628 ------------------------------------------------------------------------------------------------------------- Net gain on investments and futures contracts/foreign currency transactions $4,133,739 ------------------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $8,793,694 ------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 64 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 Statements of Changes in Net Assets ------------------------------------------------------------------------------------------------------------- Year Ended 5/2/11 to 3/31/13 3/31/12(a) ------------------------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income $ 4,659,955 $ 1,700,309 Net realized loss on investments, futures contracts and foreign currency transactions (108,889) (492,835) Change in net unrealized appreciation on investments, futures contracts and foreign currency transactions 4,242,628 65,722 ------------------------------------------------------------------------------------------------------------- Net decrease in net assets resulting from operations $ 8,793,694 $ 1,273,196 ------------------------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Net investment income: Class A ($0.55 and $0.40 per share, respectively) $ (1,017,674) $ (328,451) Class C ($0.48 and $0.33 per share, respectively) (409,985) (139,118) Class Y ($0.58 and $0.42 per share, respectively) (3,641,812) (1,246,804) ------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (5,069,471) $ (1,714,373) ------------------------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sale of shares $160,436,580 $ 66,798,132 Reinvestment of distributions 3,437,827 981,904 Cost of shares repurchased (14,027,546) (13,867,289) ------------------------------------------------------------------------------------------------------------- Net increase in net assets resulting from Fund share transactions $149,846,861 $ 53,912,747 ------------------------------------------------------------------------------------------------------------- Net increase in net assets $153,571,084 $ 53,471,570 NET ASSETS: Beginning of period 53,471,570 -- ------------------------------------------------------------------------------------------------------------- End of period $207,042,654 $ 53,471,570 ------------------------------------------------------------------------------------------------------------- Undistributed (distributions in excess of) net investment income $ (431,839) $ 101,615 ============================================================================================================= The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 65 Statement of Changes in Net Assets (continued) ------------------------------------------------------------------------------------------------------------- '13 Shares '13 Amount '12 Shares '12 Amount ------------------------------------------------------------------------------------------------------------- Class A Shares sold 4,220,656 $41,903,055 1,355,973 $13,092,716 Reinvestment of distributions 72,754 721,812 17,960 170,918 Less shares repurchased (354,800) (3,530,342) (608,916) (5,846,274) ------------------------------------------------------------------------------------------------------------- Net increase 3,938,610 $39,094,525 765,017 $ 7,417,360 ============================================================================================================= Class C Shares sold 2,487,554 $24,762,530 481,506 $ 4,750,989 Reinvestment of distributions 22,101 219,048 3,719 35,400 Less shares repurchased (103,731) (1,017,622) (16,768) (158,596) ------------------------------------------------------------------------------------------------------------- Net increase 2,405,924 $23,963,956 468,457 $ 4,627,793 ============================================================================================================= Class Y Shares sold 9,398,336 $93,770,995 5,056,591 $48,954,427 Reinvestment of distributions 252,272 2,496,967 81,350 775,586 Less shares repurchased (956,482) (9,479,582) (829,407) (7,862,419) ------------------------------------------------------------------------------------------------------------- Net increase 8,694,126 $86,788,380 4,308,534 $41,867,594 ============================================================================================================= The accompanying notes are an integral part of these financial statements. 66 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 Financial Highlights ------------------------------------------------------------------------------------------------------------- 5/2/11 Year (Commencement Ended of Operations) 3/31/13 to 3/31/12 (a) ------------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of period $ 9.63 $ 10.00 ------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income $ 0.51 $ 0.39 Net realized and unrealized gain (loss) on investments 0.45 (0.36) ------------------------------------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 0.96 $ 0.03 ------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.55) (0.40) ------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.41 $ (0.37) ------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.04 $ 9.63 ============================================================================================================= Total return* 10.24% 0.38%(b) Ratio of net expenses to average net assets 1.20% 1.20%** Ratio of net investment income to average net assets 5.05% 4.87%** Portfolio turnover rate 30% 17% Net assets, end of period (in thousands) $47,233 $ 7,365 Ratios with no waiver of fees and assumption of expenses by the Adviser: Total expenses 1.48% 1.66%** Net investment income 4.77% 4.41%** ============================================================================================================= (a) Class A shares were first publicly offered on May 2, 2011. (b) Not annualized. * Assumes initial investment at net asset value at the beginning of the period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of the period and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized. The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 67 Financial Highlights (continued) ------------------------------------------------------------------------------------------------------------- 5/2/11 Year (Commencement Ended of Operations) 3/31/13 to 3/31/12 (a) ------------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of period $ 9.61 $ 10.00 ------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income $ 0.44 $ 0.34 Net realized and unrealized gain (loss) on investments 0.45 (0.40) ------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets from investment operations $ 0.89 $ (0.06) ------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.48) (0.33) ------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.41 $ (0.39) ------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.02 $ 9.61 ============================================================================================================= Total return* 9.44% (0.47)%(b) Ratio of net expenses to average net assets 1.95% 1.98%** Ratio of net investment income to average net assets 4.29% 4.07%** Portfolio turnover rate 30% 17% Net assets, end of period (in thousands) $28,796 $ 4,501 Ratios with no waiver of fees and assumption of expenses by the Adviser: Total expenses 2.23% 2.46%** Net investment income 4.01% 3.59%** ============================================================================================================= (a) Class C shares were first publicly offered on May 2, 2011. (b) Not annualized. * Assumes initial investment at net asset value at the beginning of the period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of the period and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized. The accompanying notes are an integral part of these financial statements. 68 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ------------------------------------------------------------------------------------------------------------- 5/2/11 Year (Commencement Ended of Operations) 3/31/13 to 3/31/12 (a) ------------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 9.66 $ 10.00 ------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income $ 0.55 $ 0.42 Net realized and unrealized gain (loss) on investments 0.45 (0.34) ------------------------------------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 1.00 $ 0.08 ------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.58) (0.42) ------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.42 $ (0.34) ------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.08 $ 9.66 ============================================================================================================= Total return* 10.69% 0.95%(b) Ratio of net expenses to average net assets 0.85% 0.85%** Ratio of net investment income to average net assets 5.52% 5.48%** Portfolio turnover rate 30% 17% Net assets, end of period (in thousands) $131,013 $41,606 Ratios with no waiver of fees and assumption of expenses by the Adviser: Total expenses 1.21% 1.30%** Net investment income 5.16% 5.03%** ============================================================================================================= (a) Class Y shares were first publicly offered on May 2, 2011. (b) Not annualized. * Assumes initial investment at net asset value at the beginning of the period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of the period. ** Annualized. The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 69 Notes to Financial Statements | 3/31/13 1. Organization and Significant Accounting Policies Pioneer Absolute Return Credit Fund (the Fund) is a series of Pioneer Series Trust X, a Delaware statutory trust. The Fund is registered under the Investment Company Act of 1940 as a diversified, open-end management investment company. The investment objective of the Fund is to seek a high level of current income. Capital appreciation is a secondary objective. The Fund offers four classes of shares designated as Class A, Class C, Class Y and Class Z shares. Class A, Class C and Class Y shares were first publicly offered on May 2, 2011. Class Z shares are offered effective April 1, 2013. Each class of shares represents an interest in the same portfolio of investments of the Fund and has identical rights (based on relative net asset values) to assets and liquidation proceeds. Share classes can bear different rates of class-specific fees and expenses, such as transfer agent and distribution fees. Differences in class-specific fees and expenses will result in differences in net investment income and, therefore, the payment of different dividends from net investment income earned by each class. The Amended and Restated Declaration of Trust of the Fund gives the Board the flexibility to specify either per-share voting or dollar-weighted voting when submitting matters for shareholder approval. Under per-share voting, each share of a class of the Fund is entitled to one vote. Under dollar-weighted voting, a shareholder's voting power is determined not by the number of shares owned, but by the dollar value of the shares on the record date. Each share class has exclusive voting rights with respect to matters affecting only that class, including with respect to the distribution plan for that class. There is no distribution plan for Class Y shares. 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. 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: 70 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 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. Credit default swaps are valued by an independent pricing service based upon valuation models incorporating default probabilities, estimated recovery rates, actual reported transactions, and other available market data. 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. Shares of money market mutual funds are valued at their 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 by or at the direction or with the approval of the Valuation Committee using fair value methods pursuant to procedures adopted by the Board of Trustees. The Valuation Committee is comprised of certain members of 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 significantly from exchange prices and such differences could be material. Pioneer Investment Management, Inc. (PIM) is responsible for monitoring developments that may impact fair valued securities and for discussing and assessing fair values on an ongoing basis, and at least quarterly, with the Valuation Committee. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 71 At March 31, 2013, there were two securities that were valued using fair value methods (in addition to securities valued using prices supplied by independent pricing services) representing 0.3% 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. 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, net of unrecoverable foreign taxes withheld at the applicable country rates. Gains and losses on sales of investments are calculated on the identified cost method for both financial reporting and federal income tax purposes. B. Foreign Currency Translation The books and records of the Fund are maintained in U.S. dollars. Amounts denominated in foreign currencies are translated into U.S. dollars using current exchange rates. Net realized gains and losses on foreign currency transactions, if any, represent, among other things, the net realized gains and losses on foreign currency contracts, disposition of foreign currencies and the difference between the amount of income accrued and the U.S. dollars actually received. Further, the effects of changes in foreign currency exchange rates on investments are not segregated in the statement of operations from the effects of changes in market price of those securities but are included with the net realized and unrealized appreciation or depreciation on investments. C. Forward Foreign Currency Contracts The Fund may enter into forward foreign currency contracts (contracts) for the purchase or sale of a specific foreign currency at a fixed price on a future date. All contracts are marked to market daily at the applicable exchange rates, and any resulting unrealized appreciation or depreciation are recorded 72 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 in the Fund's financial statements. The Fund records realized gains and losses at the time a portfolio hedge is offset by entry into a closing transaction or extinguished by delivery of the currency. Risks may arise upon entering into these contracts from the potential inability of counterparties to meet the terms of the contract and from unanticipated movements in the value of foreign currencies relative to the U.S. dollar (see Note 6). D. 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 provision for federal income taxes is required. As of March 31, 2013, the Fund did not have any interest and penalties related to uncertain tax positions, which, if applicable, would be recorded as an income tax expense in the Statement of Operations. Tax years for the prior three fiscal years are subject to examination by Federal and State tax authorities. The amount and character of income and capital gain distributions to shareowners are determined in accordance with federal income tax rules, which may differ from U.S. generally accepted accounting principles. Distributions in excess of net investment income or net realized gains are temporary overdistributions for financial statement purposes resulting from differences in the recognition or classification of income or distributions for financial statement and tax purposes. Capital accounts within the financial statements are adjusted for permanent book/tax differences to reflect tax character, but are not adjusted for temporary differences. At March 31, 2013, the Fund reclassified $123,938 to increase distributions in excess of net investment income and $123,938 to decrease accumulated net realized loss on investments to reflect permanent book/tax differences. These adjustments have no impact on net assets or the results of operations. At March 31, 2013, the Fund was permitted to carry forward indefinitely $133,222 of short-term losses and $454,548 of long-term losses under the Regulated Investment Company Modernization Act of 2010 without limitation. The tax character of distributions paid during the years ended March 31, 2013 and March 31, 2012 was as follows: --------------------------------------------------------------------------- 2013 2012 --------------------------------------------------------------------------- Distributions paid from: Ordinary income $5,069,471 $1,714,373 --------------------------------------------------------------------------- Total $5,069,471 $1,714,373 =========================================================================== Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 73 The following shows the components of distributable earnings on a federal income tax basis at March 31, 2013: --------------------------------------------------------------------------- 2013 --------------------------------------------------------------------------- Distributable earnings: Undistributed ordinary income $ 153,772 Capital loss carryforward (587,770) Dividends payable (244,644) Net unrealized appreciation 3,972,683 --------------------------------------------------------------------------- Total $3,294,041 =========================================================================== The difference between book-basis and tax-basis net unrealized appreciation is attributable to the tax adjustments relating to catastrophe bonds and credit default swaps, the mark-to-market of forward currency and futures contracts, and interest accruals on preferred stock. E. 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 $17,115 in underwriting commissions on the sale of Class A shares during the year ended March 31, 2013. F. Class Allocations Income, common expenses, and realized and unrealized gains and losses are calculated at the Fund level and allocated daily to each class of shares based on its respective percentage of adjusted net assets at the beginning of the day. Distribution fees are calculated based on the average daily net asset value attributable to Class A and Class C shares of the Fund, respectively (see Note 4). Class Y shares do not pay distribution fees. All expenses and fees paid to the transfer agent, Pioneer Investment Management Shareholder Services, Inc. (PIMSS), for its services are allocated among the classes of shares based on the number of accounts in each class and the ratable allocation of related out-of-pocket expenses (see Note 3). The Fund declares as daily dividends substantially all of its net investment income. All dividends are paid on a monthly basis. Short-term capital gain distributions, if any, may be declared with the daily dividends. Distributions to shareowners are recorded as of the ex-dividend date. Distributions paid by the Fund with respect to each class of shares are calculated in the same manner and at the same time except that net investment income dividends to Class A, Class C and Class Y shares can reflect different transfer agent and distribution expense rates. 74 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 G. Risks When interest rates rise, the prices of fixed-income securities in the Fund will generally fall. Conversely, when interest rates fall, the prices of fixed-income securities in the Fund will generally rise. Investments in the Fund are subject to possible loss due to the financial failure of issuers of underlying securities and the issuers' inability to meet their debt obligations. 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. H. 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. The amount of cash deposited with the broker as collateral at March 31, 2013 was $531,000. 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 appreciation or depreciation. 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 year ended March 31, 2013 was 260. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 75 At March 31, 2013, open futures contracts were as follows: --------------------------------------------------------------------------------- Number of Unrealized Contracts Settlement Appreciation Type Long/(Short) Month Value (Depreciation) -------------------------------------------------------------------------------- CBOE VIX Future (74) 4/13 $(1,050,800) $ 122,740 CBOE VIX Future 48 5/13 748,800 (101,500) CBOE VIX Future 110 6/13 1,826,000 (112,125) CBOE VIX Future (70) 8/13 (1,249,500) 69,750 S&P 500 EMINI Future (30) 6/13 (2,344,050) (15,675) U.S. 10 Year Note (CBT) (60) 6/13 (7,919,063) 7,500 CBOE VIX Future (60) 9/13 (1,107,000) 21,251 CBOE VIX Future 40 11/13 770,000 1,999 CBOE VIX Future 60 10/13 1,134,000 650 --------------------------------------------------------------------------------- Total $ (5,410) ================================================================================= I. 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. PIM is responsible for determining that the value of the collateral remains at least equal to the repurchase price. J. Credit Default Swap Agreements A credit default swap is a contract between a buyer of protection and a seller of protection against a pre-defined credit event. The Fund may buy or sell credit default swap contracts to increase the Fund's income, to add leverage to the Fund or to hedge the risk of default on portfolio securities. When the Fund is a seller of protection, the Fund would be required to pay the notional (or other agreed-upon) value of the referenced debt obligation to the counterparty in the event of a default by a U.S. or foreign corporate issuer of a debt obligation, which would likely result in a loss to the Fund. In return, the Fund would receive from the counterparty a periodic stream of payments during the term of the contract provided that no event of default occurred. The maximum exposure of loss to the Fund as seller of protection would be the notional value of the credit default swaps outstanding. If no default occurs, the Fund would keep the stream of payments and would have no payment obligation. The Fund may also buy credit default swap contracts in order to hedge against the risk of default of debt securities, in which case the Fund would function as the counterparty described above. 76 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 When the Fund enters into a credit default swap contract, one party, the protection buyer, makes an upfront or periodic payment to the protection seller in exchange for the right to receive a contingent payment. An upfront payment received by the Fund, as the protection seller, is recorded as a liability in the Fund's records. An upfront payment made by the Fund, as the protection buyer, is recorded as an asset in the Fund's records. Periodic payments received or paid by the Fund are recorded as realized gains or losses. The credit default swap contracts are marked-to-market daily using valuations supplied by independent sources and the change in value, if any, is recorded as unrealized appreciation or depreciation. Payments received or made as a result of a credit event or upon termination of the contract are recognized, net of the appropriate amount of the upfront payment, as realized gains or losses. Credit default swap contracts involving the sale of protection may involve greater risks than if the Fund had invested in the referenced debt instrument directly. Credit default swap contracts are subject to general market risk, liquidity risk, counterparty risk and credit risk. If the Fund is a protection buyer and no credit event occurs, it will lose its investment. If the Fund is a protection seller and a credit event occurs, the value of the referenced debt instrument received by the Fund, together with the periodic payments received, may be less than the amount the Fund pays to the protection buyer, resulting in a loss to the Fund. During the year ended March 31, 2013, the Fund opened two credit default swap contracts, which were open at year end, each with a notional amount of $250,000. 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 0.70% of the Fund's average daily net assets up to $1 billion and 0.65% on assets over $1 billion. For the year ended March 31, 2013, the effective management fee (excluding waivers and/or assumption of expenses) was equivalent to 0.70% 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 1.20%, 2.10%, and 0.85% of the average daily net assets attributable to Class A, Class C and Class Y shares, respectively. Fees waived and expenses reimbursed during the year ended March 31, 2013 are reflected on the Statement of Operations. These expense limitations are in effect through August 1, 2014. There can be no assurance that PIM will extend the expense limitation agreement for a class of shares beyond the date referred to above. In addition, under the management and administration agreements, certain other services and costs, including accounting, regulatory reporting, and insurance premiums, are paid by the Fund as administrative reimbursements. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 77 Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $114,393 in management fees, administrative costs and certain other reimbursements payable to PIM at March 31, 2013. 3. Transfer Agent PIMSS, a wholly owned indirect subsidiary of UniCredit, provides substantially all transfer agent and shareowner services to the Fund at negotiated rates. In addition, the Fund reimburses PIMSS for out-of-pocket expenses incurred by PIMSS related to shareholder communications activities such as proxy and statement mailings, outgoing phone calls and omnibus relationship contracts. For the year ended March 31, 2013, such out-of-pocket expenses by class of shares were as follows: -------------------------------------------------------------------------------- Shareholder Communications: -------------------------------------------------------------------------------- Class A $ 9,436 Class C 2,223 Class Y 43,541 -------------------------------------------------------------------------------- Total $55,200 ================================================================================ Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $20,414 in transfer agent fees and out-of-pocket reimbursements payable to PIMSS at March 31, 2013. 4. Distribution Plan The Fund has adopted a Distribution Plan pursuant to Rule 12b-1 of the Investment Company Act of 1940 with respect to its Class A and Class C shares. Pursuant to the Plan, the Fund pays PFD 0.25% of the average daily net assets attributable to Class A shares as compensation for personal services and/or account maintenance services or distribution services with regard to Class A shares. Pursuant to the Plan, the Fund also pays PFD 1.00% of the average daily net assets attributable to Class C shares. The fee for 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 C shares. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $5,384 in distribution fees payable to PFD at March 31, 2013. In addition, redemptions of each class of shares (except Class Y shares) may be subject to a contingent deferred sales charge (CDSC). A CDSC of 1.00% may be imposed on redemptions of certain net asset value purchases of Class A shares within 12 months of purchase. 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 78 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 exchange remain subject to any CDSC that applied to the original purchase of those shares. There is no CDSC for Class Y shares. Proceeds from the CDSCs are paid to PFD. For the year ended March 31, 2013, CDSCs in the amount of $3,603 were paid to PFD. 5. Expense Offset Arrangements The Fund has entered into certain expense offset arrangements with PIMSS which may result in a reduction in the Fund's total expenses due to interest earned on cash held by PIMSS. For the year ended March 31, 2013, the Fund's expenses were not reduced under such arrangements. 6. Forward Foreign Currency Contracts At March 31, 2013, the Fund had entered into various forward foreign currency contracts that obligate the Fund to deliver or take delivery of currencies at specified future maturity dates. Alternatively, prior to the settlement date of a forward foreign currency contract, the Fund may close out such contract by entering into an offsetting contract. There were no open settlement hedges at March 31, 2013. The average value of portfolio hedge contracts open during the year ended March 31, 2013 was $1,703,773. Open portfolio hedges at March 31, 2013 were as follows: ------------------------------------------------------------------------------------------------ Net Net In Unrealized Contracts Exchange Settlement Appreciation Currency to Deliver For Date Value (Depreciation) ------------------------------------------------------------------------------------------------ GBP (British Pound) (70,000) $ (113,059) 5/15/13 $ (106,294) $ 6,765 CAD (Canadian Dollar) (120,000) (121,066) 6/28/13 (117,814) 3,252 EUR (Euro Dollar) (1,162,000) (1,571,304) 5/6/13 (1,490,196) 81,108 JPY (Japanese Yen) 175,000,000 1,857,213 4/22/13 1,858,874 1,661 JPY (Japanese Yen) 180,000,000 1,896,058 4/22/13 1,911,984 15,926 CAD (Canadian Dollar) (104,000) (104,019) 5/6/13 (102,231) 1,788 ------------------------------------------------------------------------------------------------ $ 110,500 ================================================================================================ 7. Bridge Loan Commitments As of March 31, 2013, the Fund had no outstanding unfunded loan commitments. The Fund had the following bridge loan commitment outstanding as of March 31, 2013: ------------------------------------------------------------------------------------------------ Net Unrealized Loan Shares Cost Value Appreciation ------------------------------------------------------------------------------------------------ Constellation Brands, Bridge Loan 600,000 $600,000 $600,000 $ -- ------------------------------------------------------------------------------------------------ Total $ -- ------------------------------------------------------------------------------------------------ Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 79 8. Additional Disclosures about Derivative Instruments and Hedging Activities: Values of derivative instruments as of March 31, 2013 were as follows: ---------------------------------------------------------------------------------------------- Derivatives Not Accounted for as Hedging Instruments Asset Derivatives 2013 Liabilities Derivatives 2013 Under Accounting ---------------------------- ---------------------------- Standards Codification Balance Sheet Balance Sheet (ASC) 815 Location Value Location Value ---------------------------------------------------------------------------------------------- Forward foreign currency Net unrealized $110,500 Net unrealized $ -- porfolio hedges* appreciation on depreciation on forward foreign forward foreign currency portfolio currency portfolio hedges hedges Futures contracts** Net unrealized -- Net unrealized 5,410 appreciation on depreciation on futures contracts futures contracts Credit default swaps Net unrealized 28,603 Net unrealized -- appreciation on depreciation on credit default credit default swaps swaps ---------------------------------------------------------------------------------------------- Total $139,103 $ 5,410 ============================================================================================== * Foreign exchange contracts are shown as net unrealized appreciation on forward foreign currency portfolio hedge contracts on the Statement of Assets and Liabilities. ** Reflects the unrealized depreciation on futures contracts (see Note 1H). 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 year ended March 31, 2013 was as follows: ----------------------------------------------------------------------------------------------- Change in Derivatives Not Unrealized Accounted for as Realized Appreciation or Hedging Instruments Gain (Loss) (Depreciation) Under Accounting Location of Gain or (Loss) on Derivatives on Derivatives Standards Codification on Derivatives Recognized Recognized Recognized (ASC) 815 in Income in Income in Income ----------------------------------------------------------------------------------------------- Forward Foreign Exchange Net realized gain on forward $ (47,993) Portfolio Hedge Contracts foreign currency contracts and other assets and liabilities denominated in foreign currencies Forward Foreign Exchange Change in unrealized appreciation $142,978 Portfolio Hedge Contracts (depreciation) on forward foreign currency contracts and other assets and liabilities denominated in foreign currencies Futures Contracts Net realized loss on futures $(861,782) contracts Futures Contracts Change in unrealized depreciation $ 61,654 on futures contracts Credit Default Swaps Net realized gain on credit $ 11,424 default swaps Credit Default Swaps Change in unrealized appreciation $ 28,603 on credit default swaps 80 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 9. Line of Credit Facility The Fund, along with certain other funds in the Pioneer Family of Funds (the Funds), participates in a committed, unsecured revolving line of credit facility. Borrowings are used solely for temporary or emergency purposes. The Fund may borrow up to the lesser of the amount available under the facility or the limits set for borrowing by the Fund's prospectus and the 1940 Act. The credit facility in effect as of February 15, 2012 is in the amount of $215 million. Under such facility, depending on the type of loan, interest on borrowings is payable at the London Interbank Offered Rate (LIBOR) plus 0.90% on an annualized basis, or the Alternate Base Rate, which is the greater of (a) the facility's administrative agent's daily announced prime rate on the borrowing date, (b) 2% plus the Federal Funds Rate on the borrowing date and (c) 2% plus the overnight Euro dollar rate on the borrowing date. The Funds pay an annual commitment fee to participate in the credit facility. The commitment fee is allocated among participating Funds based on an allocation schedule set forth in the credit agreement. For the year ended March 31, 2013, the Fund had no borrowings under the credit facility. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 81 Report of Independent Registered Public Accounting Firm To the Board of Trustees of Pioneer Series Trust X and the Shareowners of Pioneer Absolute Return Credit Fund -------------------------------------------------------------------------------- We have audited the accompanying statement of assets and liabilities, including the schedule of investments, of Pioneer Absolute Return Credit Fund (one of the portfolios constituting Pioneer Series Trust X (the "Trust")) as of March 31, 2013, and the related statement of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended and the financial highlights for each of the periods indicated therein. These financial statements and financial highlights are the responsibility of the Trust's management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. We were not engaged to perform an audit of the Trust's internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Trust's internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements and financial highlights, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our procedures included confirmation of securities owned as of March 31, 2013, by correspondence with the custodian and brokers or by other appropriate auditing procedures where replies from brokers were not received. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the financial position of Pioneer Absolute Return Credit Fund at March 31, 2013, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended, and the financial highlights for each of the periods indicated therein, in conformity with U.S. generally accepted accounting principles. /s/ Ernst & Young LLP Boston, Massachusetts May 28, 2013 82 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ADDITIONAL INFORMATION (unaudited) The percentage of the Fund's ordinary income distributions that are exempt from nonresident alien (NRA) tax withholding resulting from qualified interest income was 62.55%. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 83 Approval of Investment Advisory Agreement Pioneer Investment Management, Inc. (PIM) serves as the investment adviser to Pioneer Absolute Return Credit 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 2012 as the Trustees of the Fund agreed on, among other things, an overall approach and timeline for the process. In July 2012, 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 2012 and September 2012. 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, 2012 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 13, 2012, 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. 84 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 84 The Trustees considered that PIM supervises and monitors the performance of the Fund's service providers and provides the Fund with personnel (including Fund officers) and other resources that are necessary for the Fund's business management and operations. The Trustees also considered that, as administrator, PIM is responsible for the administration of the Fund's business and other affairs. The Trustees considered the fees paid to PIM for the provision of administration services. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that had been provided by PIM to the Fund were satisfactory and consistent with the terms of the investment advisory agreement. Performance of the Fund The Trustees considered the performance results of the Fund over various time periods. They reviewed information comparing the Fund's performance with the performance of its peer group of funds as classified by Morningstar, Inc. (Morningstar), an independent provider of investment company data, and with the performance of the Fund's benchmark index. The Trustees considered that the Fund's annualized total return was in the second quintile of its Morningstar category for the one year period ended June 30, 2012. (In all quintile rankings referred to throughout this disclosure, first quintile is most favorable to the Fund's shareowners. Thus, highest relative performance would be first quintile and lowest relative expenses would also be first quintile.) The Trustees concluded that the investment performance of the Fund was satisfactory. Management Fee and Expenses The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees 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, with respect to Class A shares of the Fund, the Fund's management fee for the twelve months ended June 30, 2012 was in the fourth quintile relative to the management fees paid by other funds in its Morningstar peer group for the comparable period. The Trustees noted that, with respect to Class A shares, the Fund's management fee was only six basis points higher than the median management fee paid by other funds in the Fund's Morningstar category, and less than one basis point higher than the management fee of the fund at the bottom of the third quintile of management fees paid by other funds in the Fund's Morningstar category. The Trustees also considered that Class Y shares of the Fund had significantly more assets than Class A shares and that, with respect to Class Y shares, the Fund's management fee for the twelve months ended June 30, 2012 was in the second quintile relative to the Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 85 management fees paid by other funds in its Morningstar category for the comparable period. The Trustees also considered the breakpoint in the management fee schedule and the reduced fee rates above certain asset levels. The Trustees considered that the expense ratio of Class A shares of the Fund for the twelve months ended June 30, 2012 was in the fourth quintile relative to its Strategic Insight peer group for the comparable period. The Trustees noted the relatively small size of the Fund and that the Fund was in its first year of operations. The Trustees also noted that the expense ratio of Class A shares of the Fund was only 3.9 basis points higher than the median expense ratio of the Fund's Strategic Insight peer group. The Trustees noted the small size of the Fund's peer group. The Trustees also considered that Class Y shares of the Fund had over five times as many assets as Class A shares, and that the expense ratio of Class Y shares of the fund for the twelve months ended June 30, 2012 was in the second quintile relative to its Morningstar category for the comparable period. The Trustees considered the impact of the Fund's non-management fee expenses on the Fund's expense ratio. The Trustees reviewed management fees charged by PIM and PIM's affiliate, Pioneer Institutional Asset Management, Inc. (together with PIM, "Pioneer") to institutional and other clients, including publicly offered European funds sponsored by affiliates of Pioneer, unaffiliated 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 Pioneer's costs in providing services to the other clients and considered the differences in management fees and profit margins for Fund and non-Fund services. In evaluating the fees associated with Pioneer'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 Pioneer's management of 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 86 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 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 noted the breakpoint in the management fee schedule. 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 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 also considered the benefits to the Fund and to PIM and its affiliates from the use of "soft" commission dollars generated by the Fund to pay for research and brokerage services. The Trustees considered the intangible benefits to PIM by virtue of its relationship with the Fund and the other Pioneer funds. The Trustees concluded that the receipt of these benefits was reasonable in the context of the overall relationship between PIM and the Fund. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including all of the Independent Trustees, concluded that the investment advisory agreement between PIM and the Fund, including the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of the investment advisory agreement for the Fund. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 87 Trustees, Officers and Service Providers Investment Adviser Pioneer Investment Management, Inc. Custodian and Sub-Administrator Brown Brothers Harriman & Co. Independent Registered Public Accounting Firm Ernst & Young LLP Principal Underwriter Pioneer Funds Distributor, Inc. Legal Counsel Bingham McCutchen LLP Shareowner Services and Transfer Agent Pioneer Investment Management Shareholder Services, Inc. Proxy Voting Policies and Procedures of the Fund are available without charge, upon request, by calling our toll free number (1-800-225-6292). Information regarding how the Fund voted proxies relating to portfolio securities during the most recent 12-month period ended June 30 is publicly available to shareowners at us.pioneerinvestments.com. This information is also available on the Securities and Exchange Commission's web site at www.sec.gov. Trustees and Officers The Fund's Trustees and Officers are listed on the following pages, together with their principal occupations during at least the past five years. Trustees who are interested persons of the Fund within the meaning of the 1940 Act are referred to as Interested Trustees. Trustees who are not interested persons of the Fund are referred to as Independent Trustees. Each of the Trustees serves as a trustee of each of the 56 U.S. registered investment portfolios for which Pioneer serves as investment adviser (the "Pioneer Funds"). The address for all Trustees and all officers of the Fund is 60 State Street, Boston, Massachusetts 02109. The Statement of Additional Information of the Fund includes additional information about the Trustees and is available, without charge, upon request, by calling 1-800-225-6292. 88 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 Independent Trustees ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Term of Office and Other Directorships Position Held with the Fund Length of Service Principal Occupation Held by Trustee ------------------------------------------------------------------------------------------------------------------------------------ Thomas J. Perna (62) Trustee since 2011. Chairman and Chief Executive Officer, Director, Broadridge Chairman of the Board and Serves until a successor Quadriserv, Inc. (technology products Financial Solutions, Inc. Trustee trustee is elected or for securities lending industry) (2008 - (investor communications and earlier retirement or present); private investor (2004 - securities processing removal. 2008); and Senior Executive Vice provider for financial President, The Bank of New York services industry) (2009 - (financial and securities services) present); Director, (1986 - 2004) Quadriserv, Inc. (2005 - present); and Commissioner, New Jersey State Civil Service Commission (2011 - present) ------------------------------------------------------------------------------------------------------------------------------------ David R. Bock (69) Trustee since 2011. Managing Partner, Federal City Capital Director of Enterprise Trustee Serves until a successor Advisors (corporate advisory services Community Investment, Inc. trustee is elected or company) (1997 - 2004 and 2008 - (privately-held affordable earlier retirement or present); Interim Chief Executive housing finance company) removal. Officer, Oxford Analytica, Inc. (1985 - 2010); Director of (privately held research and consulting Oxford Analytica, Inc. (2008 company) (2010); Executive Vice - present); Director of The President and Chief Financial Officer, Swiss Helvetia Fund, Inc. I-trax, Inc. (publicly traded health (closed-end fund) (2010 - care services company) (2004 - 2007); present); and Director of and Executive Vice President and Chief New York Mortgage Trust Financial Officer, Pedestal Inc. (publicly traded mortgage (internet-based mortgage trading REIT) (2004 - 2009, 2012 - company) (2000 - 2002) present) ------------------------------------------------------------------------------------------------------------------------------------ Benjamin M. Friedman (68) Trustee since 2011. William Joseph Maier Professor of Trustee, Mellon Trustee Serves until a successor Political Economy, Harvard University Institutional Funds trustee is elected or (1972 - present) Investment Trust and Mellon earlier retirement or Institutional Funds Master removal. Portfolio (oversaw 17 portfolios in fund complex) (1989-2008) ------------------------------------------------------------------------------------------------------------------------------------ Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 89 Independent Trustees (continued) ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Term of Office and Other Directorships Position Held with the Fund Length of Service Principal Occupation Held by Trustee ------------------------------------------------------------------------------------------------------------------------------------ Margaret B.W. Graham (65) Trustee since 2011. Founding Director, Vice President and None Trustee Serves until a successor Corporate Secretary, The Winthrop Group, trustee is elected or Inc. (consulting firm) (1982-present); earlier retirement or Desautels Faculty of Management, McGill removal. University (1999 - present); and Manager of Research Operations and Organizational Learning, Xerox PARC, Xerox's advance research center (1990-1994) ------------------------------------------------------------------------------------------------------------------------------------ Marguerite A. Piret (64) Trustee since 2011. President and Chief Executive Officer, Director of New America High Trustee Serves until a successor Newbury, Piret & Company, Inc. Income Fund, Inc. trustee is elected or (investment banking firm) (1981 - (closed-end investment earlier retirement or present) company) (2004 - present); removal. and member, Board of Governors, Investment Company Institute (2000 - 2006) ------------------------------------------------------------------------------------------------------------------------------------ Stephen K. West (84) Trustee since 2011. Senior Counsel, Sullivan & Cromwell LLP Director, The Swiss Helvetia Trustee Serves until a successor (law firm) (1998 - present); and Fund, Inc. (closed-end trustee is elected or Partner, Sullivan & Cromwell LLP (prior investment company); and earlier retirement or to 1998) Director, Invesco, Ltd. removal. (formerly AMVESCAP, PLC) (investment manager) (1997-2005) ------------------------------------------------------------------------------------------------------------------------------------ 90 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 Interested Trustees ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Term of Office and Other Directorships Position Held with the Fund Length of Service Principal Occupation Held by Trustee ------------------------------------------------------------------------------------------------------------------------------------ John F. Cogan, Jr. (86)* Trustee since 2011. Non-Executive Chairman and a director of None Trustee, President and Serves until a successor Pioneer Investment Management USA Inc. Chief Executive Officer of trustee is elected or ("PIM-USA"); Chairman and a director of the Fund earlier retirement or Pioneer; Chairman and Director of removal. Pioneer Institutional Asset Management, Inc. (since 2006); Director of Pioneer Alternative Investment Management Limited (Dublin) (until October 2011); President and a director of Pioneer Alternative Investment Management (Bermuda) Limited and affiliated funds; Deputy Chairman and a director of Pioneer Global Asset Management S.p.A. ("PGAM") (until April 2010); Director of Nano-C, Inc. (since 2003); Director of Cole Management Inc. (2004 - 2011); Director of Fiduciary Counseling, Inc. (until December 2011); President of all of the Pioneer Funds; and Retired Partner, Wilmer Cutler Pickering Hale and Dorr LLP ------------------------------------------------------------------------------------------------------------------------------------ Daniel K. Kingsbury (54)* Trustee since 2011. Director, CEO and President of PIM-USA None Trustee and Executive Vice Serves until a successor (since February 2007); Director and President trustee is elected or President of Pioneer and Pioneer earlier retirement or Institutional Asset Management, Inc. removal. (since February 2007); Executive Vice President of all of the Pioneer Funds (since March 2007); Director of PGAM (2007 - 2010); Head of New Europe Division, PGAM (2000 - 2005); Head of New Markets Division, PGAM (2005 - 2007) ------------------------------------------------------------------------------------------------------------------------------------ * Mr. Cogan and Mr. Kingsbury are Interested Trustees because they are officers or directors of the Fund's investment adviser and certain of its affiliates. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 91 Fund Officers ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Term of Office and Other Directorships Position Held with the Fund Length of Service Principal Occupation Held by Officer ------------------------------------------------------------------------------------------------------------------------------------ Christopher J. Kelley (48) Since 2011. Serves at the Vice President and Associate General None Secretary discretion of the Board. Counsel of Pioneer since January 2008 and Secretary of all of the Pioneer Funds since June 2010; Assistant Secretary of all of the Pioneer Funds from September 2003 to May 2010; and Vice President and Senior Counsel of Pioneer from July 2002 to December 2007 ------------------------------------------------------------------------------------------------------------------------------------ Carol B. Hannigan (52) Since 2011. Serves at the Fund Governance Director of Pioneer None Assistant Secretary discretion of the Board. since December 2006 and Assistant Secretary of all the Pioneer Funds since June 2010; Manager - Fund Governance of Pioneer from December 2003 to November 2006; and Senior Paralegal of Pioneer from January 2000 to November 2003 ------------------------------------------------------------------------------------------------------------------------------------ Thomas Reyes (50) Since 2011. Serves at the Counsel of Pioneer since June 2007 and None Assistant Secretary discretion of the Board. Assistant Secretary of all the Pioneer Funds since June 2010; and Vice President and Counsel at State Street Bank from October 2004 to June 2007 ------------------------------------------------------------------------------------------------------------------------------------ Mark E. Bradley (53) Since 2011. Serves at the Vice President - Fund Treasury of None Treasurer and Chief discretion of the Board. Pioneer; Treasurer of all of the Pioneer Financial and Accounting Funds since March 2008; Deputy Treasurer Officer of the Fund of Pioneer from March 2004 to February 2008; and Assistant Treasurer of all of the Pioneer Funds from March 2004 to February 2008 ------------------------------------------------------------------------------------------------------------------------------------ Luis I. Presutti (47) Since 2011. Serves at the Assistant Vice President - Fund Treasury None Assistant Treasurer discretion of the Board. of Pioneer; and Assistant Treasurer of all of the Pioneer Funds ------------------------------------------------------------------------------------------------------------------------------------ Gary Sullivan (54) Since 2011. Serves at the Fund Accounting Manager - Fund Treasury None Assistant Treasurer discretion of the Board. of Pioneer; and Assistant Treasurer of all of the Pioneer Funds ------------------------------------------------------------------------------------------------------------------------------------ 92 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Term of Office and Other Directorships Position Held with the Fund Length of Service Principal Occupation Held by Officer ------------------------------------------------------------------------------------------------------------------------------------ David F. Johnson (33) Since 2011. Serves at the Fund Administration Manager - Fund None Assistant Treasurer discretion of the Board. Treasury of Pioneer since November 2008; Assistant Treasurer of all of the Pioneer Funds since January 2009; and Client Service Manager - Institutional Investor Services at State Street Bank from March 2003 to March 2007 ------------------------------------------------------------------------------------------------------------------------------------ Jean M. Bradley (60) Since 2011. Serves at the Chief Compliance Officer of Pioneer and None Chief Compliance Officer discretion of the Board. of all the Pioneer Funds since March 2010; Director of Adviser and Portfolio Compliance at Pioneer since October 2005; and Senior Compliance Officer for Columbia Management Advisers, Inc. from October 2003 to October 2005 ------------------------------------------------------------------------------------------------------------------------------------ Kelley O'Donnell (42) Since 2011. Serves at the Director--Transfer Agency Compliance of None Anti-Money Laundering discretion of the Board. Pioneer and Anti-Money Laundering Officer Officer of all the Pioneer Funds since 2006 ------------------------------------------------------------------------------------------------------------------------------------ Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 93 This page for your notes. 94 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 This page for your notes. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 95 This page for your notes. 96 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 This page for your notes. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 97 This page for your notes. 98 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 This page for your notes. Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 99 This page for your notes. 100 Pioneer Absolute Return Credit Fund | Annual Report | 3/31/13 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. [LOGO] PIONEER Investments(R) Pioneer Investment Management, Inc. 60 State Street Boston, MA 02109 us.pioneerinvestments.com Securities offered through Pioneer Funds Distributor, Inc. 60 State Street, Boston, MA 02109 Underwriter of Pioneer Mutual Funds, Member SIPC (C) 2013 Pioneer Investments 25667-01-0513 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. Pioneer Multi-Asset Ultrashort Income Fund: Audit Fees Fees for audit services provided to the Fund, including fees associated with the filings of its Form N-1A, totaled approximately $34,990 in 2013 and $35,000 in 2012. Pioneer Fundamental Growth Fund: Audit Fees Fees for audit services provided to the Fund, including fees associated with the filings of its Form N-1A, totaled approximately $26,957 in 2013 and approximately $28,386 in 2012. Pioneer Absolute Credit Return Fund: Audit Fees Fees for audit services provided to the Fund, including fees associated with the filings of its Form N-1A, totaled approximately $34,990 in 2013 and $35,000 in 2012. (b) Disclose, under the caption AUDIT-RELATED FEES, the aggregate fees billed in each of the last two fiscal years for assurance and related services by the principal accountant that are reasonably related to the performance of the audit of the registrant's financial statements and are not reported under paragraph (a) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. Audit-Related Fees There were no fees for audit-related services provided to the Fund during the fiscal year ended March 31, 2013 and 2012. (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. Pioneer Multi-Asset Ultrashort Income Fund: Tax Fees Fees for tax compliance services, primarily for tax returns, totaled $8,290 and $8,290 in 2013 and 2012, respectively. Pioneer Fundamental Growth Fund: Tax Fees Fees for tax compliance services, primarily for tax returns, totaled $8,290 in 2013 and $8,290 in 2012. Pioneer Absolute Credit Return Fund: Tax Fees Fees for tax compliance services, primarily for tax returns, totaled $8,290 and $8,290 in 2013 and 2012, respectively. (d) Disclose, under the caption ALL OTHER FEES, the aggregate fees billed in each of the last two fiscal years for products and services provided by the principal accountant, other than the services reported in paragraphs (a) through (c) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. Other Fees There were no fees for other services provided to the Fund during the fiscal year ended March 31, 2013 and 2012. (e) (1) Disclose the audit committee's pre-approval policies and procedures described in paragraph (c)(7) of Rule 2-01 of Regulation S-X. PIONEER FUNDS APPROVAL OF AUDIT, AUDIT-RELATED, TAX AND OTHER SERVICES PROVIDED BY THE INDEPENDENT AUDITOR SECTION I - POLICY PURPOSE AND APPLICABILITY The Pioneer Funds recognize the importance of maintaining the independence of their outside auditors. Maintaining independence is a shared responsibility involving Pioneer Investment Management, Inc ("PIM"), the audit committee and the independent auditors. The Funds recognize that a Fund's independent auditors: 1) possess knowledge of the Funds, 2) are able to incorporate certain services into the scope of the audit, thereby avoiding redundant work, cost and disruption of Fund personnel and processes, and 3) have expertise that has value to the Funds. As a result, there are situations where it is desirable to use the Fund's independent auditors for services in addition to the annual audit and where the potential for conflicts of interests are minimal. Consequently, this policy, which is intended to comply with Rule 210.2-01(C)(7), sets forth guidelines and procedures to be followed by the Funds when retaining the independent audit firm to perform audit, audit-related tax and other services under those circumstances, while also maintaining independence. Approval of a service in accordance with this policy for a Fund shall also constitute approval for any other Fund whose pre-approval is required pursuant to Rule 210.2-01(c)(7)(ii). In addition to the procedures set forth in this policy, any non-audit services that may be provided consistently with Rule 210.2-01 may be approved by the Audit Committee itself and any pre-approval that may be waived in accordance with Rule 210.2-01(c)(7)(i)(C) is hereby waived. Selection of a Fund's independent auditors and their compensation shall be determined by the Audit Committee and shall not be subject to this policy. SECTION II - POLICY ---------------- -------------------------------- ------------------------------------------------- SERVICE SERVICE CATEGORY DESCRIPTION SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES CATEGORY ---------------- -------------------------------- ------------------------------------------------- I. AUDIT Services that are directly o Accounting research assistance SERVICES related to performing the o SEC consultation, registration independent audit of the Funds statements, and reporting o Tax accrual related matters o Implementation of new accounting standards o Compliance letters (e.g. rating agency letters) o Regulatory reviews and assistance regarding financial matters o Semi-annual reviews (if requested) o Comfort letters for closed end offerings ---------------- -------------------------------- ------------------------------------------------- II. Services which are not o AICPA attest and agreed-upon procedures AUDIT-RELATED prohibited under Rule o Technology control assessments SERVICES 210.2-01(C)(4) (the "Rule") o Financial reporting control assessments and are related extensions of o Enterprise security architecture the audit services support the assessment audit, or use the knowledge/expertise gained from the audit procedures as a foundation to complete the project. In most cases, if the Audit-Related Services are not performed by the Audit firm, the scope of the Audit Services would likely increase. The Services are typically well-defined and governed by accounting professional standards (AICPA, SEC, etc.) ---------------- -------------------------------- ------------------------------------------------- ------------------------------------- ------------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the audit period for all services and related fees pre-approved specific service reported at each regularly subcategories. Approval of the scheduled Audit Committee independent auditors as meeting. auditors for a Fund shall constitute pre approval for these services. ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the fund fiscal year within services and related fees a specified dollar limit (including comparison to for all pre-approved specified dollar limits) specific service subcategories reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limit for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for Audit-Related Services not denoted as "pre-approved", or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------------------ SECTION III - POLICY DETAIL, CONTINUED ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- --------------------------- ----------------------------------------------- III. TAX SERVICES Services which are not o Tax planning and support prohibited by the Rule, o Tax controversy assistance if an officer of the Fund o Tax compliance, tax returns, excise determines that using the tax returns and support Fund's auditor to provide o Tax opinions these services creates significant synergy in the form of efficiency, minimized disruption, or the ability to maintain a desired level of confidentiality. ----------------------- --------------------------- ----------------------------------------------- ------------------------------------- ------------------------- AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------- ------------------------------------- ------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year all such services and within a specified dollar limit related fees 				 (including comparison 			 to specified dollar 			 limits) reported 			 quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for tax services not denoted as pre-approved, or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------- SECTION III - POLICY DETAIL, CONTINUED ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- --------------------------- ----------------------------------------------- IV. OTHER SERVICES Services which are not o Business Risk Management support prohibited by the Rule, o Other control and regulatory A. SYNERGISTIC, if an officer of the Fund compliance projects UNIQUE QUALIFICATIONS determines that using the Fund's auditor to provide these services creates significant synergy in the form of efficiency, minimized disruption, the ability to maintain a desired level of confidentiality, or where the Fund's auditors posses unique or superior qualifications to provide these services, resulting in superior value and results for the Fund. ----------------------- --------------------------- ----------------------------------------------- --------------------------------------- ------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- -------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year within all such services and a specified dollar limit related fees 			 (including comparison 			 to specified dollar 				 limits) reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for "Synergistic" or "Unique Qualifications" Other Services not denoted as pre-approved to the left, or to add a specific service subcategory as "pre-approved" ------------------------------------- -------------------------- SECTION III - POLICY DETAIL, CONTINUED ----------------------- ------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PROHIBITED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- ------------------------- ----------------------------------------------- PROHIBITED SERVICES Services which result 1. Bookkeeping or other services in the auditors losing related to the accounting records or independence status financial statements of the audit under the Rule. client* 2. Financial information systems design and implementation* 3. Appraisal or valuation services, fairness* opinions, or contribution-in-kind reports 4. Actuarial services (i.e., setting actuarial reserves versus actuarial audit work)* 5. Internal audit outsourcing services* 6. Management functions or human resources 7. Broker or dealer, investment advisor, or investment banking services 8. Legal services and expert services unrelated to the audit 9. Any other service that the Public Company Accounting Oversight Board determines, by regulation, is impermissible ----------------------- ------------------------- ----------------------------------------------- ------------------------------------------- ------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------------- ------------------------------ o These services are not to be o A summary of all performed with the exception of the(*) services and related services that may be permitted fees reported at each if they would not be subject to audit regularly scheduled procedures at the audit client (as Audit Committee meeting defined in rule 2-01(f)(4)) level will serve as continual the firm providing the service. confirmation that has 				 not provided any restricted services. ------------------------------------------- ------------------------------ -------------------------------------------------------------------------------- GENERAL AUDIT COMMITTEE APPROVAL POLICY: o For all projects, the officers of the Funds and the Fund's auditors will each make an assessment to determine that any proposed projects will not impair independence. o Potential services will be classified into the four non-restricted service categories and the "Approval of Audit, Audit-Related, Tax and Other Services" Policy above will be applied. Any services outside the specific pre-approved service subcategories set forth above must be specifically approved by the Audit Committee. o At least quarterly, the Audit Committee shall review a report summarizing the services by service category, including fees, provided by the Audit firm as set forth in the above policy. -------------------------------------------------------------------------------- (2) Disclose the percentage of services described in each of paragraphs (b) through (d) of this Item that were approved by the audit committee pursuant to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X. Non-Audit Services Beginning with non-audit service contracts entered into on or after May 6, 2003, the effective date of the new SEC pre-approval rules, the Fund's audit committee is required to pre-approve services to affiliates defined by SEC rules to the extent that the services are determined to have a direct impact on the operations or financial reporting of the Fund. For the year ended March 31, 2013 and 2012, there were no services provided to an affiliate that required the Fund's audit committee pre- approval. (f) If greater than 50 percent, disclose the percentage of hours expended on the principal accountant's engagement to audit the registrant's financial statements for the most recent fiscal year that were attributed to work performed by persons other than the principal accountant's full-time, permanent employees. N/A (g) Disclose the aggregate non-audit fees billed by the registrant's accountant for services rendered to the registrant, and rendered to the registrant's investment adviser (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant for each of the last two fiscal years of the registrant. Pioneer Multi-Asset Ultrashort Income Fund: The aggregate non-audit fees for the Fund and affiliates, as previously defined, totaled approximately $8,290 in 2013 and $8,290 in 2012 Pioneer Fundamental Growth Fund: The aggregate non-audit fees for the Fund and affiliates, as previously defined, totaled approximately $8,290 in 2013 and $8,290 in 2012. Pioneer Absolute Credit Return Fund: The aggregate non-audit fees for the Fund and affiliates, as previously defined, totaled approximately $8,290 in 2013 and $8,290 in 2012. (h) Disclose whether the registrant's audit committee of the board of trustees has considered whether the provision of non-audit services that were rendered to the registrant's investment adviser (not including any subadviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the investment adviser that provides ongoing services to the registrant that were not pre-approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant's independence. The Fund's audit committee of the Board of Trustees has considered whether the provision of non-audit services that were rendered to the Affiliates (as defined) that were not pre- approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant's independence. Item 5. Audit Committee of Listed Registrants (a) If the registrant is a listed issuer as defined in Rule 10A-3 under the Exchange Act (17 CFR 240.10A-3), state whether or not the registrant has a separately-designated standing audit committee established in accordance with Section 3(a)(58)(A) of the Exchange Act (15 U.S.C. 78c(a)(58)(A)). If the registrant has such a committee, however designated, identify each committee member. If the entire board of directors is acting as the registrants audit committee as specified in Section 3(a)(58)(B) of the Exchange Act (15 U.S.C. 78c(a)(58)(B)), so state. N/A (b) If applicable, provide the disclosure required by Rule 10A-3(d) under the Exchange Act (17 CFR 240.10A-3(d)) regarding an exemption from the listing standards for audit committees. N/A Item 6. Schedule of Investments. File Schedule I Investments in securities of unaffiliated issuers as of the close of the reporting period as set forth in 210.12- 12 of Regulation S-X [17 CFR 210.12-12], unless the schedule is included as part of the report to shareholders filed under Item 1 of this Form. Included in Item 1 ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END MANAGEMENT INVESTMENT COMPANIES. A closed-end management investment company that is filing an annual report on this Form N-CSR must, unless it invests exclusively in non-voting securities, describe the policies and procedures that it uses to determine how to vote proxies relating to portfolio securities, including the procedures that the company uses when a vote presents a conflict between the interests of its shareholders, on the one hand, and those of the company's investment adviser; principal underwriter; or any affiliated person (as defined in Section 2(a)(3) of the Investment Company Act of 1940 (15 U.S.C. 80a-2(a)(3)) and the rules thereunder) of the company, its investment adviser, or its principal underwriter, on the other. Include any policies and procedures of the company's investment adviser, or any other third party, that the company uses, or that are used on the company's behalf, to determine how to vote proxies relating to portfolio securities. Not applicable to open-end management investment companies. Item 8. Portfolio Managers of Closed-End Management Investment Companies. (a) If the registrant is a closed-end management investment company that is filing an annual report on this Form N-CSR,provide the following information: (1) State the name, title, and length of service of the person or persons employed by or associated with the registrant or an investment adviser of the registrant who are primarily responsible for the day-to-day management of the registrants portfolio (Portfolio Manager). Also state each Portfolio Managers business experience during the past 5 years. Not applicable to open-end management investment companies. Item 9. Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers. (a) If the registrant is a closed-end management investment company, in the following tabular format, provide the information specified in paragraph (b) of this Item with respect to any purchase made by or on behalf of the registrant or any affiliated purchaser, as defined in Rule 10b-18(a)(3) under the Exchange Act (17 CFR 240.10b-18(a)(3)), of shares or other units of any class of the registrants equity securities that is registered by the registrant pursuant to Section 12 of the Exchange Act (15 U.S.C. 781). Instruction to paragraph (a). Disclose all purchases covered by this Item, including purchases that do not satisfy the conditions of the safe harbor of Rule 10b-18 under the Exchange Act (17 CFR 240.10b-18), made in the period covered by the report. Provide disclosures covering repurchases made on a monthly basis. For example, if the reporting period began on January 16 and ended on July 15, the chart would show repurchases for the months from January 16 through February 15, February 16 through March 15, March 16 through April 15, April 16 through May 15, May 16 through June 15, and June 16 through July 15. Not applicable to open-end management investment companies. Item 10. Submission of Matters to a Vote of Security Holders. Describe any material changes to the procedures by which shareholders may recommend nominees to the registrants board of directors, where those changes were implemented after the registrant last provided disclosure in response to the requirements of Item 7(d)(2)(ii)(G) of Schedule 14A (17 CFR 240.14a-101), or this Item. There have been no material changes to the procedures by which the shareholders may recommend nominees to the registrants board of directors since the registrant last provided disclosure in response to the requirements of Item 7(d)(2)(ii)(G) of Schedule 14(A) in its definitive proxy statement, or this Item. ITEM 11. CONTROLS AND PROCEDURES. (a) Disclose the conclusions of the registrant's principal executive officer or officers and principal financial officer or officers, or persons performing similar functions, about the effectiveness of the registrant's disclosure controls and procedures (as defined in Rule 30a-2(c) under the Act (17 CFR 270.30a-2(c))) based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of the report that includes the disclosure required by this paragraph. The registrant's principal executive officer and principal financial officer have concluded that the registrant's disclosure controls and procedures are effective based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this report. (b) Disclose whether or not there were significant changes in the registrant's internal controls or in other factors that could significantly affect these controls subsequent to the date of their evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses. There were no significant changes in the registrant's internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. The registrant's principal executive officer and principal financial officer, however, voluntarily are reporting the following information: In August of 2006 the registrant's investment adviser enhanced its internal procedures for reporting performance information required to be included in prospectuses. Those enhancements involved additional internal controls over the appropriateness of performance data generated for this purpose. Such enhancements were made following an internal review which identified prospectuses relating to certain classes of shares of a limited number of registrants where, inadvertently, performance information not reflecting the deduction of applicable sales charges was included. Those prospectuses were revised, and the revised prospectuses were distributed to shareholders. ITEM 12. EXHIBITS. File the exhibits listed below as part of this Form. Letter or number the exhibits in the sequence indicated. (a) Any code of ethics, or amendment thereto, that is the subject of the disclosure required by Item 2, to the extent that the registrant intends to satisfy the Item 2 requirements through filing of an exhibit. (b) A separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2 under the Act (17 CFR 270.30a-2). Filed herewith. SIGNATURES [See General Instruction F] Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. (Registrant) Pioneer Series Trust X By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr, President Date May 30, 2013 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 May 30, 2013 By (Signature and Title)* /s/ Mark Bradley Mark Bradley, Treasurer & Chief Accounting & Financial Officer Date May 30, 2013 * Print the name and title of each signing officer under his or her signature.