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 September 30, 2012 Form N-CSR is to be used by management investment companies to file reports with the Commission not later than 10 days after the transmission to stockholders of any report that is required to be transmitted to stockholders under Rule 30e-1 under the Investment Company Act of 1940 (17 CFR 270.30e-1). The Commission may use the information provided on Form N-CSR in its regulatory, disclosure review, inspection, and policymaking roles. A registrant is required to disclose the information specified by Form N-CSR, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-CSR unless the Form displays a currently valid Office of Management and Budget ("OMB") control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. ss. 3507. ITEM 1. REPORTS TO SHAREOWNERS. Pioneer Fundamental Growth Fund -------------------------------------------------------------------------------- Semiannual Report | September 30, 2012 -------------------------------------------------------------------------------- Ticker Symbols: Class A PIGFX Class B FUNBX Class C FUNCX Class R PFGRX* Class Y FUNYX Class Z PFGZX* * Share class was first publicly offered on April 2, 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 18 Schedule of Investments 20 Financial Statements 24 Notes to Financial Statements 34 Trustees, Officers and Service Providers 42 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 1 President's Letter Dear Shareowner, The U.S. stock market rallied sharply through the third quarter of 2012 amid a sluggish, but nonetheless growing, U.S. economy. We have been cautiously optimistic about the U.S. from the start of the year, and the economic data continue to be encouraging. The housing and auto sectors are benefitting from record-low interest rates. The climate for consumer and business credit has improved, and inflation appears to be subdued. While corporate profits slowed in the third quarter, many U.S. companies continue to have strong balance sheets and to pay attractive dividends* compared to fixed-income securities. All of these factors contributed to gains for investors who owned riskier assets, including equities and higher-yielding corporate bonds. Year to date through September 30, 2012, the Standard & Poor's 500 Index returned 16.35%. In fixed income, the Bank of America Merrill Lynch High Yield Master II Index was up by 12.02% during the same period, while the Barclays Capital Aggregate Bond Index gained 3.99%. Treasury bonds, by contrast, generated a comparatively sluggish return of 1.70%, as measured by the Barclays Capital Intermediate Treasuries Index. Despite this generally positive picture during the first nine months of 2012, investors face powerful macroeconomic challenges in the months ahead. These include the threat of a so-called "fiscal cliff" in the U.S. budget process after the November elections, the European sovereign-debt crisis, and slowing growth in both Europe and China. Investors can continue to count on market volatility tied to these factors, although we remain optimistic that the underlying economic trends are moving in the right direction. At Pioneer, we have long advocated the benefits of staying diversified** and investing for the long term. And while diversification alone does not assure a profit or protect against loss in a declining market, we believe in actively seeking out opportunities in undervalued securities and sectors around the globe. Our advice, as always, is to work closely with a trusted financial advisor to discuss your goals and work together to develop an investment strategy that meets your individual needs. There is no single best strategy that works for every investor. * Dividends are not guaranteed. ** Diversification does not assure a profit or protect against loss in a declining market. 2 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 Pioneer's investment professionals focus on finding good opportunities in both equity and bond markets using the same disciplined investment approach we have used since 1928. Our strategy is to identify undervalued individual securities with the greatest potential for success, carefully weighing risk against reward. Our teams of investment professionals continually monitor and analyze the relative valuations of different sectors and securities globally to help build portfolios that we believe can help you achieve your investment goals. We invite you to learn more about Pioneer and our time-tested approach to investing by consulting with your financial advisor or visiting us online at us.pioneerinvestments.com. We greatly appreciate your trust in us, and we thank you for investing with Pioneer. Sincerely, /s/ Daniel K. Kingsbury Daniel K. Kingsbury President and CEO Pioneer Investment Management USA, Inc. Any information in this shareowner report regarding market or economic trends or the factors influencing the Fund's historical or future performance are statements of opinion as of the date of this report. These statements should not be relied upon for any other purposes. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 3 Portfolio Management Discussion | 9/30/12 In a volatile period for the investment markets, stock values generally moved upward during the six months ended September 30, 2012. Renewed confidence about the direction of the economy led to a brisk rally in the final three months of the period, after a rocky start in the first three months. In the following interview, Timothy Mulrenan, Andrew Acheson, and Paul Cloonan discuss the market environment and the performance of Pioneer Fundamental Growth Fund during the six months ended September 30, 2012. Mr. Mulrenan, vice president and portfolio manager at Pioneer, was responsible for day-to-day portfolio management of the Fund during the six months ended September 30, 2012, with the support of Mr. Acheson, senior vice president and portfolio manager at Pioneer. Mr. Cloonan, Co-Head of Equity Research, U.S., at Pioneer, will join the Fund as a portfolio manager, replacing Mr. Mulrenan, effective November 1, 2012*. Q How would you describe the market environment during the six months ended September 30, 2012? A The six months ended September 30, 2012, consisted of two contrasting quarters, with stocks and other perceived riskier asset classes falling out of favor in the first three months of the period, before improving investor sentiment about global growth prospects led to a rally in the second three months. The shifting market dynamics were linked mainly to macroeconomic trends rather than to company-specific fundamentals. During the first three months of the period, investors sought to limit their exposure to stocks because of fears about economic conditions in Europe as well as in the United States. The financial crisis in Europe appeared to be worsening, as several nations faced higher borrowing costs and investors worried about the exposure of major banking institutions to the problems swirling around the euro zone. The concerns about Europe led to worries about weakening global economic trends in general, concerns that were further exacerbated by slowing growth trends in China. Meanwhile, corporate profit growth in the United States was unimpressive, with several companies reporting disappointing earnings results. Conditions began to improve in July 2012, however, as the European Central Bank (ECB) announced that it would become more aggressive in providing liquidity help to any sovereign nation that requested assistance. * Effective November 1, 2012, Mr. Cloonan, Co-Head of Equity Research, U.S., at Pioneer, will join Mr. Acheson as a portfolio manager of the Fund, replacing Mr. Mulrenan. 4 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 The ECB said that its assistance would include the indirect purchase of sovereign debt, a move with the potential to drive down the borrowing costs of troubled nations. Investor confidence received another boost in September when the U.S. Federal Reserve (the Fed) announced its third round of quantitative easing ("QE3"), in an effort to encourage lower interest rates through the purchasing of government securities on the open market. The combined actions of the central banks helped to quiet fears about the strength of the global economic recovery, and stock prices generally rose during the final three months of the period, overcoming the losses equity markets had experienced during the first three months. Q How did the Fund perform in that environment during the six months ended September 30, 2012? A Pioneer Fundamental Growth Fund Class A shares returned 3.02% at net asset value during the six months ended September 30, 2012, while the Fund's benchmark, the Russell 1000 Growth Index (the Russell Index), returned 1.84%. During the same period, the average return of the 741 mutual funds in Lipper's Large-Cap Growth Funds category was 0.27%. Q What were the main reasons behind the Fund's outperformance of the benchmark Russell Index during the six months ended September 30, 2012? A During the volatile six-month period, the Fund's traditional emphasis on higher-quality, financially healthy growth companies with defensible competitive positions helped it to weather the changing economic environment and to outperform both the Russell Index and its Lipper peers. The Fund's higher-quality emphasis helped it to hold up relatively well during the market downturn of the first three months of the period. The Fund subsequently captured most of its gains when stocks rallied in the second three months of the period. Our investment discipline for the Fund relies principally on stock selection rather than sector or industry weightings, and so it was no surprise to us that generally positive security selection results were the key to the Fund's relative outperformance during the period. Stock picks in the information technology sector had an especially favorable effect on the Fund's relative performance; selection results in the sector were responsible for half of the Fund's statistical outperformance of the benchmark during the period. In addition, stock selection in the consumer discretionary sector also made a noteworthy contribution to the Fund's relative returns. Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 5 Q What individual investments contributed the most to the Fund's performance during the six months ended September 30, 2012? A The top individual contributor in the portfolio during the period was a consumer discretionary stock: Ross Stores, a long-time Fund holding. The corporation operates a chain of retail shops specializing in name-brand merchandise offered at discounted prices. The chain has focused on the southern parts of the U.S., including the Southwest, but recently has begun to move into the Midwest. Ross is a well-managed company that has executed its business plan very well and has consistently posted healthy earnings gains, both from expanding same-store sales and from profitable new-store development. In health care, the Fund's holding in DaVita was the second-biggest contributor to performance. DaVita has achieved its growth by becoming one of the nation's leading operators of dialysis centers for kidney patients. At period-end, DaVita was in the process of acquiring Health Care Partners, the largest physician network in the United States. Health Care Partners has distinguished itself by efficiently managing patient services by taking a more holistic, rather than specialist-oriented, approach to patient care. We think Health Care Partners' operations have the potential to set important examples for reducing the total cost of health care, and we think the acquisition should add to DaVita's overall earnings power. A position in Disney, the well-known media and theme-park corporation, also made a significant contribution to the Fund's performance during the period. We added Disney to the portfolio in late 2011, and since then the stock has performed very well. Although the media industry has become increasingly fragmented, Disney's brands and operations have done well, especially its ESPN business, which has become a dominant force in sports broadcasting. Disney also is coming to the end of a substantial investment program in its theme parks, and we think the company is well positioned to start realizing profit gains from those investments. Google was the top performance contributor among the Fund's information technology holdings during the period, as the company's stock price registered healthy gains from its core Internet search business. At the same time, Google's Android operating system has become the leader in the smartphone market. We also think the company's profit outlook should not be seriously affected by a recent patent lawsuit filed, and won, by Apple. We think the lawsuit actually posed more problems for Samsung, which makes the hardware for many Android-based smartphones, rather than for Google. 6 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 Rounding out the top five positive performance contributors for the period was the Fund's holding in MasterCard, a leading global financial transaction processing company (credit and debit cards). MasterCard has continued to experience significant growth domestically as well as outside of the U.S., as both credit and debit card use has become increasingly accepted by consumers around the globe. Q What investments detracted from the Fund's performance during the six months ended September 30, 2012? A The Fund's positioning in the financials sector was the most notable factor holding back performance during the period. Specifically, the portfolio's holding in Progressive Insurance, a leading auto insurance company, lagged the overall results of the financials sector. Early in the six-month period, the company indicated that the cost of insurance claims, which has been below historical trends for several quarters, may begin to rise and thus pressure profit margins in the near term. Although claims costs have been rising from their previous low level, we expect that they will remain within the company's long-range expectations. We have maintained the portfolio's position in Progressive, with the expectation that the company will be a long-term share gainer within the auto insurance industry. Notable among other performance detractors in the portfolio during the period was communications network equipment company Juniper Networks. The company has been hurt by modest infrastructure spending by the major telecommunication services providers. Meanwhile, Juniper's new products have failed to contribute to significant increases in sales. While we have eliminated the Fund's position in Juniper, we have retained portfolio exposure to several other companies that detracted from performance results during the past six months. One such holding was coffee chain Starbucks, whose stock underperformed after the company reported softer-than-anticipated sales growth this past summer. We have maintained the Fund's position because Starbucks' earnings have remained solid and the company's longer-term growth prospects appear good. Starbucks has been doing especially well internationally as it expands into Asian markets. Worries about the global economic cycle hurt two other Fund holdings during the period: industrial gas producer Praxair and package delivery corporation United Parcel Service (UPS). Although Praxair's operating Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 7 earnings have continued to hold up, its stock price trailed that of the overall market during the period as investors feared that a slowing of global growth trends would hurt the company's business. Similarly, UPS's stock underperformed primarily due to concerns about the global economic backdrop. Moreover, the company's China-to-Europe business also fell as demand from Europe declined. Despite the immediate market concerns about Praxair and UPS, we continue to hold both stocks in the portfolio because of our more favorable long-term outlook for the companies. Q What changes did you make to the Fund's portfolio during the six months ended September 30, 2012? A In addition to selling the Fund's position in Juniper Networks, we liquidated investments in natural gas company Southwestern Energy, and in Western Union, which specializes in money transfer services. We believed that Southwestern's profit growth prospects were limited by the low prices for natural gas, while we were unsure of Western Union's earnings prospects, given that the company faces the need to invest in digital technology to defend its competitive position. We added several new investments to the portfolio during the period, including Express Scripts, a pharmacy benefit manager (PBM) that recently has acquired Medco, another PBM. We think the combined company has the potential to strengthen its position in the competitive market, and to grow earnings. Also in health care, we established a Fund position in Celgene, a biotechnology company that produces therapies for cancer and rheumatology. In the industrials sector, we initiated a position in Cummins Engine, a leading producer of large truck engines and engine components. We think the trucking industry is about to move into a new replacement cycle; that should benefit Cummins, as the company is introducing new engines capable of meeting stricter standards for air emissions. Q What is your investment outlook? A We think the Fund is well positioned for an uneasy investment environment. In the near term, we expect to see increased volatility arising from continued uncertainty over the pace of global economic growth. Moreover, markets also will be anxious about immediate developments in the United States and how the November elections may affect potential negotiations over the country's debt ceiling, spending cuts and tax policy (the so-called "fiscal cliff"). 8 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 We don't think it likely that we will see concrete signs of progress in Europe before the second half of 2013. In the case of China, the slowing of economic growth there has been more severe than we expected, and it is possible that any acceleration in growth may be delayed until the change in political leadership, which is scheduled to take place soon. We believe it may take as long as 12 to 18 months before we see positive resolutions to many of the questions that continue to hover over investors' minds--and contribute to market uncertainty. Until then, the markets may remain volatile and change direction rapidly from time to time. Nevertheless, we think stocks, in general, are reasonably priced, especially relative to other asset classes, and we feel the Fund is well positioned to weather continued market volatility because of its portfolio of what we believe to be higher-quality, financially strong growth companies. In an uncertain time, we believe companies that can demonstrate durable business models and strong competitive positions should do well. Please refer to the Schedule of Investments on pages 20-23 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 | Semiannual Report | 9/30/12 9 Portfolio Summary | 9/30/12 Portfolio Diversification -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] U.S. Common Stocks 93.7% Depositary Receipts for International Stocks 3.6% International Common Stocks 2.7% Sector Distribution -------------------------------------------------------------------------------- (As a percentage of equity holdings) Information Technology 33.3% Consumer Staples 15.1% Health Care 15.1% Industrials 10.7% Consumer Discretionary 9.6% Energy 6.6% Materials 6.5% Financials 3.1% 10 Largest Holdings -------------------------------------------------------------------------------- (As a percentage of equity holdings)* [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] 1. Apple, Inc. 6.96% -------------------------------------------------------------------------------- 2. Google, Inc. 5.09 -------------------------------------------------------------------------------- 3. Mastercard, Inc. 4.91 -------------------------------------------------------------------------------- 4. Microsoft Corp. 4.76 -------------------------------------------------------------------------------- 5. Philip Morris International, Inc. 4.40 -------------------------------------------------------------------------------- 6. Oracle Corp. 4.18 -------------------------------------------------------------------------------- 7. Ross Stores, Inc. 4.05 -------------------------------------------------------------------------------- 8. The Coca-Cola Co. 3.98 -------------------------------------------------------------------------------- 9. QUALCOMM, Inc. 3.89 -------------------------------------------------------------------------------- 10. Starbucks Corp. 3.31 -------------------------------------------------------------------------------- * 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 | Semiannual Report | 9/30/12 Prices and Distributions | 9/30/12 Net Asset Value per Share -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 9/30/12 3/31/12 -------------------------------------------------------------------------------- A $13.63 $13.23 -------------------------------------------------------------------------------- B $12.80 $12.50 -------------------------------------------------------------------------------- C $12.90 $12.57 -------------------------------------------------------------------------------- Y $13.72 $13.30 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 9/30/12 4/2/12 -------------------------------------------------------------------------------- R* $13.61 $13.34 -------------------------------------------------------------------------------- Z* $13.64 $13.34 -------------------------------------------------------------------------------- * Class R and Class Z shares were first publicly offered on April 2, 2012. Distributions per Share: 4/1/12-9/30/12 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains -------------------------------------------------------------------------------- A $ -- $ -- $ -- -------------------------------------------------------------------------------- B $ -- $ -- $ -- -------------------------------------------------------------------------------- C $ -- $ -- $ -- -------------------------------------------------------------------------------- R $ -- $ -- $ -- -------------------------------------------------------------------------------- Y $ -- $ -- $ -- -------------------------------------------------------------------------------- Z $ -- $ -- $ -- -------------------------------------------------------------------------------- The Russell 1000 Growth Index 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 12-17. Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 11 Performance Update | 9/30/12 Class A Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Fundamental Growth Fund at public offering price, compared to that of the Russell 1000 Growth Index. Average Annual Total Returns (As of September 30, 2012) -------------------------------------------------------------------------------- Net Asset Public Offering Period Value (NAV) Price (POP) -------------------------------------------------------------------------------- 10 Years 9.01% 8.38% 5 Years 4.58 3.35 1 Year 28.85 21.49 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated August 1, 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 9/30/2002 $ 9,425 $ 10,000 9/30/2003 $ 11,787 $ 12,592 9/30/2004 $ 12,390 $ 13,537 9/30/2005 $ 14,681 $ 15,107 9/30/2006 $ 15,346 $ 16,019 9/30/2007 $ 17,870 $ 19,119 9/30/2008 $ 15,071 $ 15,127 9/30/2009 $ 15,166 $ 14,847 9/30/2010 $ 16,457 $ 16,725 9/30/2011 $ 17,347 $ 17,357 9/30/2012 $ 22,352 $ 22,424 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 | Semiannual Report | 9/30/12 Performance Update | 9/30/12 Class B Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Fundamental Growth Fund, compared to that of the Russell 1000 Growth Index. Average Annual Total Returns (As of September 30, 2012) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class 12/15/2005 5.04% 5.04% 5 Years 3.58 3.58 1 Year 27.43 23.43 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated August 1, 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 9/30/2006 $ 10,341 $ 10,297 9/30/2007 $ 11,947 $ 12,290 9/30/2008 $ 9,978 $ 9,724 9/30/2009 $ 9,952 $ 9,544 9/30/2010 $ 10,688 $ 10,751 9/30/2011 $ 11,176 $ 11,158 9/30/2012 $ 14,242 $ 14,414 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 | Semiannual Report | 9/30/12 13 Performance Update | 9/30/12 Class C Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Fundamental Growth Fund, compared to that of the Russell 1000 Growth Index. Average Annual Total Returns (As of September 30, 2012) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class 12/15/2005 5.15% 5.15% 5 Years 3.73 3.73 1 Year 27.79 27.79 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated August 1, 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 9/30/2006 $ 10,331 $ 10,297 9/30/2007 $ 11,936 $ 12,290 9/30/2008 $ 9,978 $ 9,724 9/30/2009 $ 9,963 $ 9,544 9/30/2010 $ 10,719 $ 10,751 9/30/2011 $ 11,217 $ 11,158 9/30/2012 $ 14,335 $ 14,414 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 | Semiannual Report | 9/30/12 Performance Update | 9/30/12 Class R Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Fundamental Growth Fund, compared to that of the Russell 1000 Growth Index. Average Annual Total Returns (As of September 30, 2012) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 9.00% 9.00% 5 Years 4.55 4.55 1 Year 28.66 28.66 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated August 1, 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 9/30/2002 $ 10,000 $ 10,000 9/30/2003 $ 12,500 $ 12,592 9/30/2004 $ 13,140 $ 13,537 9/30/2005 $ 15,569 $ 15,107 9/30/2006 $ 16,274 $ 16,019 9/30/2007 $ 18,950 $ 19,119 9/30/2008 $ 15,982 $ 15,127 9/30/2009 $ 16,083 $ 14,847 9/30/2010 $ 17,452 $ 16,725 9/30/2011 $ 18,396 $ 17,357 9/30/2012 $ 23,669 $ 22,424 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. Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 15 Performance Update | 9/30/12 Class Y Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 million investment made in Pioneer Fundamental Growth Fund, compared to that of the Russell 1000 Growth Index. Average Annual Total Returns (As of September 30, 2012) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 9.17% 9.17% 5 Years 4.87 4.87 1 Year 29.24 29.24 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated August 1, 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 9/30/2002 $ 5,000,000 $ 5,000,000 9/30/2003 $ 6,250,000 $ 6,295,832 9/30/2004 $ 6,569,767 $ 6,768,559 9/30/2005 $ 7,784,464 $ 7,553,444 9/30/2006 $ 8,137,068 $ 8,009,355 9/30/2007 $ 9,475,052 $ 9,559,494 9/30/2008 $ 7,991,224 $ 7,563,626 9/30/2009 $ 8,064,715 $ 7,423,471 9/30/2010 $ 8,774,224 $ 8,362,667 9/30/2011 $ 9,300,846 $ 8,678,642 9/30/2012 $ 12,020,152 $ 11,211,777 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. 16 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 Performance Update | 9/30/12 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 September 30, 2012) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- 10 Years 9.02% 9.02% 5 Years 4.59 4.59 1 Year 28.95 28.95 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated August 1, 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 9/30/2002 $ 10,000 $ 10,000 9/30/2003 $ 12,500 $ 12,592 9/30/2004 $ 13,140 $ 13,537 9/30/2005 $ 15,569 $ 15,107 9/30/2006 $ 16,274 $ 16,019 9/30/2007 $ 18,950 $ 19,119 9/30/2008 $ 15,982 $ 15,127 9/30/2009 $ 16,083 $ 14,847 9/30/2010 $ 17,452 $ 16,725 9/30/2011 $ 18,396 $ 17,357 9/30/2012 $ 23,721 $ 22,424 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. Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 17 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 Fundamental Growth Fund Based on actual returns from April 1, 2012 through September 30, 2012. ----------------------------------------------------------------------------------------------------------- Share Class A B C R Y Z ----------------------------------------------------------------------------------------------------------- Beginning Account $ 1,000.00 $ 1,000.00 $ 1,000.00 $ 1,000.00 $ 1,000.00 $1,000.00 Value on 4/1/12** ----------------------------------------------------------------------------------------------------------- Ending Account $ 1,030.20 $ 1,024.00 $ 1,026.20 $ 1,020.20 $ 1,031.60 $1,022.50 Value (after expenses) on 9/30/12 ----------------------------------------------------------------------------------------------------------- Expenses Paid $ 5.60 $ 10.96 $ 9.45 $ 7.05 $ 3.87 $ 4.54 During Period* ----------------------------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 1.10%, 2.16%, 1.86%, 1.40%, 0.76% and 0.90% for Class A, Class B, Class C, Class R, Class Y and Class Z shares, respectively, multiplied by the average account value over the period, multiplied by 183/365 (182/365 for Class R and Class Z shares) (to reflect the one-half year period). ** Class R and Class Z shares were first publicly offered on April 2, 2012. 18 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 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 April 1, 2012 through September 30, 2012. ----------------------------------------------------------------------------------------------------------- Share Class A B C R Y Z ----------------------------------------------------------------------------------------------------------- Beginning Account $ 1,000.00 $ 1,000.00 $ 1,000.00 $ 1,000.00 $ 1,000.00 $ 1,000.00 Value on 4/1/12** ----------------------------------------------------------------------------------------------------------- Ending Account $ 1,019.55 $ 1,014.24 $ 1,015.74 $ 1,017.95 $ 1,021.26 $ 1,020.44 Value (after expenses) on 9/30/12 ----------------------------------------------------------------------------------------------------------- Expenses Paid $ 5.57 $ 10.91 $ 9.40 $ 7.04 $ 3.85 $ 4.53 During Period* ----------------------------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 1.10%, 2.16%, 1.86%, 1.40%, 0.76% and 0.90% for Class A, Class B, Class C, Class R, Class Y and Class Z shares, respectively, multiplied by the average account value over the period, multiplied by 183/365 (182/365 for Class R and Class Z shares) (to reflect the one-half year period). ** Class R and Class Z shares were first publicly offered on April 2, 2012. Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 19 Schedule of Investments | 9/30/12 (unaudited) ------------------------------------------------------------------------------------------- Shares Value ------------------------------------------------------------------------------------------- COMMON STOCKS -- 97.8% ENERGY -- 6.5% Oil & Gas Equipment & Services -- 2.9% 358,100 National Oilwell Varco, Inc. $ 28,687,391 ------------------------------------------------------------------------------------------- Integrated Oil & Gas -- 3.6% 247,150 Exxon Mobil Corp. $ 22,601,868 144,700 Occidental Petroleum Corp. 12,452,882 ------------- $ 35,054,750 ------------- Total Energy $ 63,742,141 ------------------------------------------------------------------------------------------- MATERIALS -- 6.4% Fertilizers & Agricultural Chemicals -- 1.2% 128,005 Monsanto Co. $ 11,651,015 ------------------------------------------------------------------------------------------- Industrial Gases -- 2.4% 220,370 Praxair, Inc. $ 22,892,036 ------------------------------------------------------------------------------------------- Specialty Chemicals -- 1.6% 243,950 Ecolab, Inc. $ 15,810,400 ------------------------------------------------------------------------------------------- Gold -- 1.2% 208,430 Newmont Mining Corp. $ 11,674,164 ------------- Total Materials $ 62,027,615 ------------------------------------------------------------------------------------------- CAPITAL GOODS -- 8.2% Aerospace & Defense -- 3.0% 372,255 United Technologies Corp. $ 29,143,844 ------------------------------------------------------------------------------------------- Industrial Conglomerates -- 3.1% 329,095 3M Co. $ 30,414,960 ------------------------------------------------------------------------------------------- Construction & Farm Machinery & Heavy Trucks -- 1.0% 110,300 Cummins, Inc. $ 10,170,763 ------------------------------------------------------------------------------------------- Trading Companies & Distributors -- 1.1% 49,200 WW Grainger, Inc. $ 10,251,804 ------------- Total Capital Goods $ 79,981,371 ------------------------------------------------------------------------------------------- TRANSPORTATION -- 2.3% Air Freight & Logistics -- 2.3% 313,630 United Parcel Service, Inc. (Class B) $ 22,446,499 ------------- Total Transportation $ 22,446,499 ------------------------------------------------------------------------------------------- CONSUMER SERVICES -- 3.2% Restaurants -- 3.2% 622,000 Starbucks Corp. $ 31,566,500 ------------- Total Consumer Services $ 31,566,500 ------------------------------------------------------------------------------------------- MEDIA -- 2.2% Movies & Entertainment -- 2.2% 408,050 The Walt Disney Co. $ 21,332,854 ------------- Total Media $ 21,332,854 ------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 20 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------- Shares Value ------------------------------------------------------------------------------------------- RETAILING -- 4.0% Apparel Retail -- 4.0% 598,040 Ross Stores, Inc. $ 38,633,384 ------------- Total Retailing $ 38,633,384 ------------------------------------------------------------------------------------------- FOOD & STAPLES RETAILING -- 4.2% Drug Retail -- 3.0% 607,550 CVS Caremark Corp. $ 29,417,571 ------------------------------------------------------------------------------------------- Food Retail -- 1.2% 120,600 Whole Foods Market, Inc. $ 11,746,440 ------------- Total Food & Staples Retailing $ 41,164,011 ------------------------------------------------------------------------------------------- FOOD, BEVERAGE & TOBACCO -- 9.7% Soft Drinks -- 5.4% 157,650 Fomento Economico Mexicano SAB de CV (A.D.R.) $ 14,500,647 1,001,780 The Coca-Cola Co. 37,997,515 ------------- $ 52,498,162 ------------------------------------------------------------------------------------------- Tobacco -- 4.3% 467,100 Philip Morris International, Inc. $ 42,010,974 ------------- Total Food, Beverage & Tobacco $ 94,509,136 ------------------------------------------------------------------------------------------- HOUSEHOLD & PERSONAL PRODUCTS -- 0.9% Household Products -- 0.9% 126,600 The Procter & Gamble Co. $ 8,780,976 ------------- Total Household & Personal Products $ 8,780,976 ------------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 7.8% Health Care Equipment -- 3.7% 191,445 Baxter International, Inc. $ 11,536,476 414,950 Covidien Plc 24,656,329 ------------- $ 36,192,805 ------------------------------------------------------------------------------------------- Health Care Services -- 4.1% 266,850 DaVita, Inc.* $ 27,648,328 199,400 Express Scripts Holding Co.* 12,496,398 ------------- $ 40,144,726 ------------- Total Health Care Equipment & Services $ 76,337,531 ------------------------------------------------------------------------------------------- PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 7.0% Biotechnology -- 1.8% 143,896 Celgene Corp.* $ 10,993,654 124,200 Vertex Pharmaceuticals, Inc.* 6,948,990 ------------- $ 17,942,644 ------------------------------------------------------------------------------------------- Pharmaceuticals -- 2.7% 286,250 Allergan, Inc. $ 26,214,775 ------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 21 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------- Shares Value ------------------------------------------------------------------------------------------- Life Sciences Tools & Services -- 2.5% 406,880 Thermo Fisher Scientific, Inc. $ 23,936,750 ------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 68,094,169 ------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 1.4% Specialized Finance -- 1.4% 100,665 IntercontinentalExchange, Inc.* $ 13,429,718 ------------- Total Diversified Financials $ 13,429,718 ------------------------------------------------------------------------------------------- INSURANCE -- 1.4% Property & Casualty Insurance -- 1.4% 639,380 The Progressive Corp. $ 13,260,741 ------------- Total Insurance $ 13,260,741 ------------------------------------------------------------------------------------------- SOFTWARE & SERVICES -- 18.5% Internet Software & Services -- 5.0% 64,330 Google, Inc.* $ 48,536,985 ------------------------------------------------------------------------------------------- Data Processing & Outsourced Services -- 4.8% 103,770 Mastercard, Inc. $ 46,850,080 ------------------------------------------------------------------------------------------- Systems Software -- 8.7% 1,524,340 Microsoft Corp. $ 45,394,845 1,265,470 Oracle Corp. 39,849,650 ------------- $ 85,244,495 ------------- Total Software & Services $ 180,631,560 ------------------------------------------------------------------------------------------- TECHNOLOGY HARDWARE & EQUIPMENT -- 10.6% Communications Equipment -- 3.8% 593,610 Qualcomm, Inc. $ 37,094,689 ------------------------------------------------------------------------------------------- Computer Hardware -- 6.8% 99,535 Apple, Inc. $ 66,415,724 ------------- Total Technology Hardware & Equipment $ 103,510,413 ------------------------------------------------------------------------------------------- SEMICONDUCTORS & SEMICONDUCTOR EQUIPMENT -- 3.5% Semiconductor Equipment -- 2.1% 372,750 ASML Holding NV (A.D.R.) $ 20,009,220 ------------------------------------------------------------------------------------------- Semiconductors -- 1.4% 408,300 Xilinx, Inc. $ 13,641,303 ------------- Total Semiconductors & Semiconductor Equipment $ 33,650,523 ------------------------------------------------------------------------------------------- TOTAL COMMON STOCKS (Cost $741,887,188) $ 953,099,142 ------------------------------------------------------------------------------------------- TOTAL INVESTMENT IN SECURITIES -- 97.8% (Cost $741,887,188) (a) $ 953,099,142 ------------------------------------------------------------------------------------------- OTHER ASSETS & LIABILITIES -- 2.2% $ 21,905,958 ------------------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $ 975,005,100 ------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 22 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 * Non-income producing security. (A.D.R.) American Depositary Receipts. (a) At September 30, 2012, the net unrealized gain on investments based on cost for federal income tax purposes of $743,082,101 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $ 212,225,245 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (2,208,204) -------------- Net unrealized gain $ 210,017,041 ============== Purchases and sales of securities (excluding temporary cash investments) for the six months ended September 30, 2012 aggregated $216,679,743 and $63,506,776, respectively. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. Level 1 - quoted prices in active markets for identical securities Level 2 - other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.) Level 3 - significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) Generally, equity securities are categorized as Level 1, fixed income securities and senior loans as Level 2 and securities valued using fair value methods (other than prices supplied by independent pricing services) are categorized as Level 3. See Notes to Financial Statements -- Note 1A. The following is a summary of the inputs used as of September 30, 2012, in valuing the Fund's assets: -------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total -------------------------------------------------------------------------------- Common Stocks $953,099,142 $ -- $ -- $ 953,099,142 -------------------------------------------------------------------------------- Total $953,099,142 $ -- $ -- $ 953,099,142 ================================================================================ The accompanying notes are an integral part of these financial statements. Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 23 Statement of Assets and Liabilities | 9/30/12 (unaudited) ASSETS: Investment in securities (cost $741,887,188) $953,099,142 Cash 24,371,547 Receivables -- Investment securities sold 756,149 Fund shares sold 4,538,926 Dividends 912,320 Due from affiliates 129,453 Due from Pioneer Investment Management, Inc. 13,342 Other 112,171 -------------------------------------------------------------------------------- Total assets $983,933,050 ================================================================================ LIABILITIES: Payables -- Investment securities purchased $ 7,147,951 Fund shares repurchased 1,649,543 Due to affiliates 113,508 Accrued expenses 16,948 -------------------------------------------------------------------------------- Total liabilities $ 8,927,950 ================================================================================ NET ASSETS: Paid-in capital $757,745,152 Undistributed net investment income 2,755,424 Accumulated net realized gain on investments 3,292,570 Net unrealized gain on investments 211,211,954 -------------------------------------------------------------------------------- Total net assets $975,005,100 ================================================================================ NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Class A (based on $391,356,974/28,721,096 shares) $ 13.63 Class B (based on $3,174,294/247,903 shares) $ 12.80 Class C (based on $56,768,146/4,400,925 shares) $ 12.90 Class R (based on $159,603/11,729 shares) $ 13.61 Class Y (based on $523,528,454/38,147,820 shares) $ 13.72 Class Z (based on $17,629/1,292 shares) $ 13.64 MAXIMUM OFFERING PRICE: Class A ($13.63 (divided by) 94.25%) $ 14.46 ================================================================================ The accompanying notes are an integral part of these financial statements. 24 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 Statement of Operations (unaudited) For the Six Months Ended 9/30/12 INVESTMENT INCOME: Dividends (net of foreign taxes withheld of $28,822) $ 6,215,557 Interest 13,474 -------------------------------------------------------------------------------------------------- Total investment income $ 6,229,031 -------------------------------------------------------------------------------------------------- EXPENSES: Management fees $ 2,800,153 Transfer agent fees Class A 121,786 Class B 6,545 Class C 15,383 Class Y 4,464 Class Z 15 Distribution fees Class A 450,408 Class B 15,605 Class C 212,264 Class R 126 Shareholder communications expense 267,368 Administrative reimbursements 122,563 Custodian fees 12,961 Registration fees 40,841 Professional fees 38,227 Printing expense 25,044 Fees and expenses of nonaffiliated Trustees 8,331 Miscellaneous 15,353 -------------------------------------------------------------------------------------------------- Total expenses $ 4,157,437 Less fees waived and expenses reimbursed by Pioneer Investment Management, Inc. (36,631) -------------------------------------------------------------------------------------------------- Net expenses $ 4,120,806 -------------------------------------------------------------------------------------------------- Net investment income $ 2,108,225 -------------------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS: Net realized loss on investments $ (3,367,504) -------------------------------------------------------------------------------------------------- Change in net unrealized gain on investments $ 33,850,548 -------------------------------------------------------------------------------------------------- Net gain on investments $ 30,483,044 -------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 32,591,269 ================================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 25 Statement of Changes in Net Assets -------------------------------------------------------------------------------------------------- Six Months Ended 9/30/12 Year Ended (unaudited) 3/31/12 -------------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income $ 2,108,225 $ 2,075,948 Net realized gain (loss) on investments (3,367,504) 13,832,845 Change in net unrealized gain on investments 33,850,548 69,418,797 -------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 32,591,269 $ 85,327,590 -------------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Net investment income: Class A ($0.00 and $0.03 per share, respectively) $ -- $ (487,169) Class Y ($0.00 and $0.07 per share, respectively) -- (1,318,638) Net realized gain: Class A ($0.00 and $0.30 per share, respectively) -- (4,746,151) Class B ($0.00 and $0.30 per share, respectively) -- (87,881) Class C ($0.00 and $0.30 per share, respectively) -- (539,842) Class Y ($0.00 and $0.30 per share, respectively) -- (5,958,549) -------------------------------------------------------------------------------------------------- Total distributions to shareowners $ -- $ (13,138,230) -------------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sale or exchange of shares $ 290,586,871 $ 432,147,397 Reinvestment of distributions -- 8,177,366 Cost of shares repurchased (135,936,014) (93,643,390) -------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets resulting from Fund share transactions $ 154,650,857 $ 346,681,373 -------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets $ 187,242,126 $ 418,870,733 NET ASSETS: Beginning of period 787,762,974 368,892,241 -------------------------------------------------------------------------------------------------- End of period $ 975,005,100 $ 787,762,974 -------------------------------------------------------------------------------------------------- Undistributed net investment income $ 2,755,424 $ 647,199 ================================================================================================== The accompanying notes are an integral part of these financial statements. 26 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------- 9/30/12 9/30/12 Shares Amount 3/31/12 3/31/12 (unaudited) (unaudited) Shares Amount --------------------------------------------------------------------------------------- Class A Shares sold 8,871,070 $115,623,458 19,396,234 $234,741,946 Reinvestment of distributions -- -- 418,234 4,691,030 Less shares repurchased (6,379,374) (83,074,270) (3,982,787) (47,524,046) --------------------------------------------------------------------------------------- Net increase 2,491,696 $ 32,549,188 15,831,681 $191,908,930 ======================================================================================= Class B Shares sold or exchanged 36,661 $ 455,650 100,515 $ 1,125,814 Reinvestment of distributions -- -- 7,205 76,090 Less shares repurchased (61,374) (750,000) (191,777) (2,156,277) --------------------------------------------------------------------------------------- Net decrease (24,713) $ (294,350) (84,057) $ (954,373) ======================================================================================= Class C Shares sold 1,992,914 $ 24,747,534 1,692,846 $ 19,363,891 Reinvestment of distributions -- -- 39,795 422,711 Less shares repurchased (287,009) (3,557,662) (373,086) (4,218,195) --------------------------------------------------------------------------------------- Net increase 1,705,905 $ 21,189,872 1,359,555 $ 15,568,407 ======================================================================================= Class R* Shares sold 11,729 $ 156,392 -- $ -- Reinvestment of distributions -- -- -- -- Less shares repurchased -- -- -- -- --------------------------------------------------------------------------------------- Net increase 11,729 $ 156,392 -- $ -- ======================================================================================= Class Y Shares sold 11,497,675 $149,586,578 14,339,090 $176,915,746 Reinvestment of distributions -- -- 263,491 2,987,535 Less shares repurchased (3,686,688) (48,554,082) (3,283,465) (39,744,872) --------------------------------------------------------------------------------------- Net increase 7,810,987 $101,032,496 11,319,116 $140,158,409 ======================================================================================= Class Z* Shares sold 1,292 $ 17,259 -- $ -- Reinvestment of distributions -- -- -- -- Less shares repurchased -- -- -- -- --------------------------------------------------------------------------------------- Net increase 1,292 $ 17,259 -- $ -- ======================================================================================= * 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 | Semiannual Report | 9/30/12 27 Financial Highlights ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 9/30/12 Ended Ended Ended Ended Ended (unaudited) 3/31/12 3/31/11 3/31/10 3/31/09 3/31/08 ------------------------------------------------------------------------------------------------------------------------------------ Class A Net asset value, beginning of period $ 13.23 $ 11.86 $ 10.96 $ 8.25 $ 11.32 $11.26 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income $ 0.02 $ 0.02 $ 0.03 $ 0.02 $ 0.01 $ 0.01 Net realized and unrealized gain (loss) on investments 0.38 1.68 1.17 3.29 (3.06) 0.27 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net assets from investment operations $ 0.40 $ 1.70 $ 1.20 $ 3.31 $ (3.05) $ 0.28 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income -- (0.03) (0.02) (0.02) -- -- Net realized gain -- (0.30) (0.28) (0.58) (0.02) (0.22) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 0.40 $ 1.37 $ 0.90 $ 2.71 $ (3.07) $ 0.06 ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 13.63 $ 13.23 $ 11.86 $ 10.96 $ 8.25 $11.32 ==================================================================================================================================== Total return* 3.02% 14.84% 11.23% 40.50% (26.95)% 2.39% Ratio of net expenses to average net assets+ 1.10%** 1.19% 1.25% 1.25% 1.25% 1.25% Ratio of net investment income to average net assets+ 0.35%** 0.28% 0.25% 0.14% 0.24% 0.13% Portfolio turnover rate 15%** 16% 18% 45% 27% 30% Net assets, end of period (in thousands) $391,357 $346,987 $123,305 $117,218 $ 6,720 $4,053 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.12%** 1.19% 1.28% 1.47% 3.94% 3.94% Net investment income (loss) 0.33%** 0.28% 0.22% (0.07)% (2.45)% (2.56)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.10%** 1.19% 1.25% 1.25% 1.25% 1.25% Net investment income 0.35%** 0.28% 0.25% 0.14% 0.24% 0.13% ==================================================================================================================================== * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized. + Ratios with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. 28 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 9/30/12 Ended Ended Ended Ended Ended (unaudited) 3/31/12 3/31/11 3/31/10 3/31/09 3/31/08 ------------------------------------------------------------------------------------------------------------------------------------ Class B Net asset value, beginning of period $ 12.50 $ 11.30 $ 10.53 $ 8.01 $ 11.09 $ 11.13 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment loss $ (0.04) $ (0.09) $ (0.07)(a) $ (0.05)(a) $ (0.04) $ (0.05) Net realized and unrealized gain (loss) on investments 0.34 1.59 1.12 3.15 (3.02) 0.23 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net assets from investment operations $ 0.30 $ 1.50 $ 1.05 $ 3.10 $ (3.06) $ 0.18 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net realized gain -- (0.30) (0.28) (0.58) (0.02) (0.22) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 0.30 $ 1.20 $ 0.77 $ 2.52 $ (3.08) $ (0.04) ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 12.80 $ 12.50 $ 11.30 $ 10.53 $ 8.01 $ 11.09 ==================================================================================================================================== Total return* 2.40% 13.77% 10.26% 39.09% (27.60)% 1.51% Ratio of net expenses to average net assets+ 2.16%** 2.15% 2.15% 2.15% 2.16% 2.17% Ratio of net investment loss to average net assets+ (0.72)%** (0.71)% (0.65)% (0.71)% (0.67)% (0.78)% Portfolio turnover rate 15%** 16% 18% 45% 27% 30% Net assets, end of period (in thousands) $ 3,174 $ 3,407 $ 4,029 $ 4,114 $ 1,169 $ 1,057 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 2.33%** 2.29% 2.23% 2.53% 4.85% 5.01% Net investment loss (0.89)%** (0.85)% (0.73)% (1.09)% (3.36)% (3.62)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 2.16%** 2.15% 2.15% 2.15% 2.15% 2.15% Net investment loss (0.72)%** (0.71)% (0.65)% (0.71)% (0.66)% (0.76)% ==================================================================================================================================== (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. ** Annualized. + Ratios with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 29 Financial Highlights (continued) ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 9/30/12 Ended Ended Ended Ended Ended (unaudited) 3/31/12 3/31/11 3/31/10 3/31/09 3/31/08 ------------------------------------------------------------------------------------------------------------------------------------ Class C Net asset value, beginning of period $ 12.57 $ 11.34 $ 10.56 $ 8.02 $ 11.09 $ 11.13 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment loss $ (0.02) $ (0.04) $ (0.05)(a) $ (0.04)(a) $ (0.02) $ (0.05) Net realized and unrealized gain (loss) on investments 0.35 1.57 1.11 3.16 (3.03) 0.23 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net assets from investment operations $ 0.33 $ 1.53 $ 1.06 $ 3.12 $ (3.05) $ 0.18 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net realized gain -- (0.30) (0.28) (0.58) (0.02) (0.22) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 0.33 $ 1.23 $ 0.78 $ 2.54 $ (3.07) $ (0.04) ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 12.90 $ 12.57 $ 11.34 $ 10.56 $ 8.02 $ 11.09 ==================================================================================================================================== Total return* 2.62% 13.98% 10.33% 39.29% (27.51)% 1.51% Ratio of net expenses to average net assets+ 1.86%** 1.96% 2.03% 2.15% 2.15% 2.17% Ratio of net investment loss to average net assets+ (0.40)%** (0.50)% (0.52)% (0.72)% (0.65)% (0.79)% Portfolio turnover rate 15%** 16% 18% 45% 27% 30% Net assets, end of period (in thousands) $56,768 $33,880 $15,149 $11,331 $ 1,187 $ 377 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.86%** 1.96% 2.03% 2.31% 4.95% 5.00% Net investment loss (0.40)%** (0.50)% (0.52)% (0.88)% (3.45)% (3.62)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.86%** 1.96% 2.03% 2.15% 2.15% 2.15% Net investment loss (0.40)%** (0.50)% (0.52)% (0.72)% (0.65)% (0.77)% ==================================================================================================================================== (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. ** Annualized. + Ratios with no reduction for fees paid indirectly. The accompanying notes are an integral part of these financial statements. 30 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 -------------------------------------------------------------------------------- 4/2/12 (a) to 9/30/12 (unaudited) -------------------------------------------------------------------------------- Class R Net asset value, beginning of period $ 13.34 -------------------------------------------------------------------------------- Increase from investment operations: Net investment loss $ (0.01) Net realized and unrealized gain on investments 0.28 -------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 0.27 -------------------------------------------------------------------------------- Distributions to shareowners: Net investment income -- Net realized gain -- -------------------------------------------------------------------------------- Net increase in net asset value $ 0.27 -------------------------------------------------------------------------------- Net asset value, end of period $ 13.61 ================================================================================ Total return* 2.02% Ratio of net expenses to average net assets 1.40%** Ratio of net investment income to average net assets 0.17%** Portfolio turnover rate 15%** Net assets, end of period (in thousands) $ 160 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.56%** Net investment income 0.01%** 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 0.17%** ================================================================================ (a) Class R shares were first publicly offered on April 2, 2012. * 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 | Semiannual Report | 9/30/12 31 Financial Highlights (continued) ------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year 9/30/12 Ended Ended 4/8/09 (a) (unaudited) 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 income $ 0.04 $ 0.07 $ 0.08 $ 0.03 Net realized and unrealized gain on investments 0.38 1.69 1.19 3.17 ------------------------------------------------------------------------------------------------------------ Net increase in net assets from investment operations $ 0.42 $ 1.76 $ 1.27 $ 3.20 ------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income -- (0.07) (0.07) (0.03) Net realized gain -- (0.30) (0.28) (0.58) ------------------------------------------------------------------------------------------------------------ Net increase in net asset value $ 0.42 $ 1.39 $ 0.92 $ 2.59 ------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 13.72 $ 13.30 $ 11.91 $ 10.99 ------------------------------------------------------------------------------------------------------------ Total return* 3.16% 15.29% 11.84% 38.49%(b) Ratio of net expenses to average net assets+ 0.76%** 0.78% 0.78% 0.89%** Ratio of net investment income to average net assets+ 0.70%** 0.67% 0.72% 0.46%** Portfolio turnover rate 15%** 16% 18% 45%(b) Net assets, end of period (in thousands) $523,528 $403,490 $226,409 $238,017 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.76%** 0.78% 0.78% 0.97%** Net investment income 0.70%** 0.67% 0.72% 0.38%** Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.76%** 0.78% 0.78% 0.89%** Net investment income 0.70%** 0.67% 0.72% 0.46%** ============================================================================================================ (a) Class Y shares were first publicly offered on April 8, 2009. (b) Not annualized. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at 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. 32 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 -------------------------------------------------------------------------------- 4/2/12 (a) to 9/30/12 (unaudited) -------------------------------------------------------------------------------- Class Z Net asset value, beginning of period $ 13.34 -------------------------------------------------------------------------------- Increase from investment operations: Net investment income $ 0.02 Net realized and unrealized gain on investments 0.28 -------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 0.30 -------------------------------------------------------------------------------- Distributions to shareowners: Net investment income -- Net realized gain -- -------------------------------------------------------------------------------- Net increase in net asset value $ 0.30 -------------------------------------------------------------------------------- Net asset value, end of period $ 13.64 ================================================================================ Total return* 2.25% Ratio of net expenses to average net assets 0.90%** Ratio of net investment income to average net assets 0.57%** Portfolio turnover rate 15%** Net assets, end of period (in thousands) $ 18 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.98%** Net investment income 0.49%** 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 0.57%** ================================================================================ (a) Class Z shares were first publicly offered on April 2, 2012. * 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 | Semiannual Report | 9/30/12 33 Notes to Financial Statements | 9/30/12 (unaudited) 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 six classes of shares designated as Class A, Class B, Class C, 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. Effective as of the close of business on December 31, 2009, Class B shares are no longer offered to new or existing shareholders, except that dividends and/or capital gain distributions may continue to be reinvested in Class B shares, and shareholders may exchange their Class B shares for Class B shares of other Pioneer funds, as permitted by existing exchange privileges. Each class of shares represents an interest in the same portfolio of investments of the Fund and has identical rights (based on relative net asset values) to assets and liquidation proceeds. Share classes can bear different rates of class-specific fees and expenses such as transfer agent and distribution fees. Differences in class-specific fees and expenses will result in differences in net investment income and, therefore, the payment of different dividends from net investment income earned by each class. The Amended and Restated Declaration of Trust of the Fund gives the Board the flexibility to specify either per share voting or dollar-weighted voting when submitting matters for shareholder approval. Under per share voting, each share of a class of the Fund is entitled to one vote. Under dollar-weighted voting, a shareholder's voting power is determined not by the number of shares owned, but by the dollar value of the shares on the record date. Each share class has exclusive voting rights with respect to matters affecting only that class, including with respect to the distribution plan for that class. There is no distribution plan for Class Y or Class Z shares. Class B shares convert to Class A shares approximately eight years after the date of purchase. The Fund's financial statements have been prepared in conformity with U.S. generally accepted accounting principles that require the management of the Fund to, among other things, make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of income, expenses and gains and losses on investments during the reporting period. Actual results could differ from those estimates. 34 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 The following is a summary of significant accounting policies followed by the Fund in the preparation of its financial statements, which are consistent with those policies generally accepted in the investment company industry: A. Security Valuation Security transactions are recorded as of trade date. The net asset value of the Fund is computed once daily, on each day the New York Stock Exchange (NYSE) is open, as of the close of regular trading on the NYSE. In computing the net asset value, securities that have traded on an exchange are valued at the last sale price on the principal exchange where they are traded. Securities that have not traded on the date of valuation, or securities for which sale prices are not available, generally are valued at the mean between the last bid and asked prices. Short-term fixed income securities with remaining maturities of sixty days or less generally are valued at amortized cost. Money market mutual funds are valued at net asset value. Trading in foreign securities is substantially completed each day at various times prior to the close of the NYSE. The values of such securities used in computing the net asset value of the Fund's shares are determined as of such times. Securities for which market prices and/or quotations are not readily available or are considered to be unreliable are valued using fair value methods pursuant to procedures adopted by the Board of Trustees. The Fund may use fair value methods if it is determined that a significant event has occurred after the close of the exchange or market on which the security trades and prior to the determination of the Fund's net asset value. Examples of a significant event might include political or economic news, corporate restructurings, natural disasters, terrorist activity or trading halts. Thus, the valuation of the Fund's securities may differ from exchange prices. At September 30, 2012, 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. 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. Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 35 Gains and losses on sales of investments are calculated on the identified cost method for both financial reporting and federal income tax purposes. B. Federal Income Taxes It is the Fund's policy to comply with the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute all of its taxable income and net realized capital gains, if any, to its shareowners. Therefore, no federal income tax provision is required. As of September 30, 2012, the Fund did not have any interest and penalties related to unrecognized 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 remain subject to examination by federal and state tax authorities. The amounts and characterizations of distributions to shareowners for financial reporting purposes are determined in accordance with federal income tax rules. Therefore, the sources of the Fund's distributions may be shown in the accompanying financial statements as from or in excess of net investment income or as from net realized gain on investment transactions, or as from paid-in capital, depending on the type of book/tax differences that may exist. The tax character of current year distributions payable will be determined at the end of the Fund's taxable year. The tax character of distributions paid during the year ended March 31, 2012 was as follows: ---------------------------------------------------------------------------- 2012 ---------------------------------------------------------------------------- Distributions paid from: Ordinary income $ 1,805,807 Long-term capital gain 11,332,423 ---------------------------------------------------------------------------- Total $13,138,230 ============================================================================ The following shows the components of distributable earnings on a federal income tax basis at March 31, 2012: ---------------------------------------------------------------------------- 2012 ---------------------------------------------------------------------------- Distributable earnings: Undistributed ordinary income $ 647,199 Undistributed long-term gain 7,854,987 Net unrealized gain 176,166,493 ---------------------------------------------------------------------------- Total $184,668,679 ============================================================================ The difference between book-basis and tax-basis net unrealized gain is attributable to the tax deferral of losses on wash sales. 36 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 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 $64,617 in underwriting commissions on the sale of Class A shares during the six months ended September 30, 2012. D. Class Allocations Income, common expenses and realized and unrealized gains and losses are calculated at the Fund level and allocated daily to each class of shares based on its respective percentage of adjusted net assets at the beginning of the day. Distribution fees are calculated based on the average daily net asset value attributable to Class A, Class B, 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. 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. Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 37 F. Securities Lending The Fund may lend securities in its portfolio to certain broker-dealers or other institutional investors. When entering into a securities loan transaction, the Fund typically receives cash collateral from the borrower equal to at least the value of the securities loaned, which is invested in temporary investments. Credit Suisse AG, New York Branch, as the Fund's securities lending agent, manages the Fund's securities lending collateral. The income earned on the investment of collateral is shared with the borrower and the lending agent in payment of any rebate due to the borrower with respect to the securities loan, and in compensation for the lending agent's services to the Fund. The Fund also continues to receive payments in lieu of dividends or interest on the securities loaned. Gain or loss on the value of the loaned securities that may occur during the term of the loan will be for the account of the Fund. The amount of the collateral is required to be adjusted daily to reflect any price fluctuation in the value of the loaned securities. If the required market value of the collateral is less than the value of the loaned securities, the borrower is required to deliver additional collateral for the account of the Fund prior to the close of business on that day. The Fund has the right, under the lending agreement, to terminate the loan and recover the securities from the borrower with prior notice. The Fund is required to return the cash collateral to the borrower and could suffer a loss if the value of the collateral, as invested, has declined. At September 30, 2012, the Fund had no securities on loan. G. Repurchase Agreements With respect to repurchase agreements entered into by the Fund, the value of the underlying securities (collateral), including accrued interest, is required to be equal to or in excess of the repurchase price. The collateral for all repurchase agreements is held in safekeeping in the customer-only account of the Fund's custodian or a subcustodian of the Fund. The Fund's investment adviser, Pioneer Investment Management, Inc. (PIM), is responsible for determining that the value of the collateral remains at least equal to the repurchase price. 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 six months ended September 30, 2012, the effective management fee (excluding waivers and/or assumption of expenses) was equivalent to 0.65% of the Fund's average daily net assets. 38 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 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 six months ended September 30, 2012 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. 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 $96,278 in management fees, administrative costs and certain other reimbursements payable to PIM at September 30, 2012. Effective March 5, 2012 PIM has retained Brown Brothers Harriman & Co. to provide certain sub-administration and accounting services to the Fund. 3. Transfer Agent PIMSS, a wholly owned indirect subsidiary of UniCredit, provides substantially all transfer agent and shareowner services to the Fund at negotiated rates. In addition, the Fund reimburses PIMSS for out-of-pocket expenses incurred by PIMSS related to shareholder communications activities such as proxy and statement mailings, outgoing phone calls and omnibus relationship contracts. For the six months ended September 30, 2012, such out-of-pocket expenses by class of shares were as follows: -------------------------------------------------------------------------------- Shareholder Communications: -------------------------------------------------------------------------------- Class A $ 158,368 Class B 3,056 Class C 15,640 Class R 83 Class Y 90,221 -------------------------------------------------------------------------------- Total $ 267,368 ================================================================================ Included in "Due from affiliates" reflected on the Statement of Assets and Liabilities is $129,453 in transfer agent fees and out-of-pocket reimbursements payable to PIMSS at September 30, 2012. Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 39 4. Distribution Plan The Fund has adopted a Distribution Plan pursuant to Rule 12b-1 of the Investment Company Act of 1940 with respect to its Class A, Class B, Class C and Class R shares. Pursuant to the Plan, the Fund pays PFD 0.25% of the average daily net assets attributable to Class A shares as compensation for personal services and/or account maintenance services or distribution services with regard to Class A shares. Pursuant to the Plan, the Fund also pays PFD 1.00% of the average daily net assets attributable to Class B and Class C shares. The fee for Class B and Class C shares consists of a 0.25% service fee and a 0.75% distribution fee paid as compensation for personal services and/or account maintenance services or distribution services with regard to Class B and Class C shares. Pursuant to the Plan, the Fund further pays PFD 0.50% of the average daily net assets attributable to Class R shares for distribution services. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $17,230 in distribution fees payable to PFD at September 30, 2012. The Fund also has adopted a separate service plan for Class R shares (Service Plan). The Service Plan authorizes the Fund to pay securities dealers, plan administrators or other service organizations that agree to provide certain services to retirement plans or plan participants holding shares of the Fund a service fee of up to 0.25% of the Fund's average daily net assets attributable to Class R shares held by such plans. In addition, redemptions of each class of shares (except Class R, Class Y and Class Z shares) may be subject to a contingent deferred sales charge (CDSC). A CDSC of 1.00% may be imposed on redemptions of certain net asset value purchases of Class A shares within 12 months of purchase. Class B shares that are redeemed within five years of purchase are subject to a CDSC at declining rates beginning at 4.00%, based on the lower of cost or market value of shares being redeemed. Redemptions of Class C shares within one year of purchase are subject to a CDSC of 1.00%, based on the lower of cost or market value of shares being redeemed. Shares purchased as part of an exchange remain subject to any CDSC that applied to the original purchase of those shares. There is no CDSC for Class R, Class Y or Class Z shares. Proceeds from the CDSCs are paid to PFD. For the six months ended September 30, 2012, CDSCs in the amount of $5,555 were paid to PFD. 5. Expense Offset Arrangements The Fund has entered into certain expense offset arrangements with PIMSS which may result in a reduction in the Fund's total expenses due to interest earned on cash held by PIMSS. For the six months ended September 30, 2012, the Fund's expenses were not reduced under such arrangements. 40 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 6. Line of Credit Facility The Fund, along with certain other funds in the Pioneer Family of Funds (the Funds), participates in a committed, unsecured revolving line of credit facility. Borrowings are used solely for temporary or emergency purposes. The Fund may borrow up to the lesser of the amount available under the facility or the limits set for borrowing by the Fund's prospectus and the 1940 Act. The credit facility in effect until January 20, 2012 was in the amount of $165 million. Under such facility, interest on borrowings was payable at the higher of the London Interbank Offered Rate (LIBOR) on the borrowing date plus 1.25% on an annualized basis or the Federal Funds Rate on the borrowing date plus 1.25% on an annualized basis. The credit facility in effect as of February 15, 2012 is in the amount of $215 million. Under such facility, depending on the type of loan, interest on borrowings is payable at LIBOR plus 0.90% on an annualized basis, or the Alternate Base Rate, which is the greater of (a) the facility's administrative agent's daily announced prime rate on the borrowing date, (b) 2% plus the Federal Funds Rate on the borrowing date and (c) 2% plus the overnight Euro dollar rate on the borrowing date. The Funds pay an annual commitment fee to participate in a credit facility. The commitment fee is allocated among participating Funds based on an allocation schedule set forth in the credit agreement. For the six months ended September 30, 2012, the Fund had no borrowings under a credit facility. Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 41 Trustees, Officers and Service Providers Trustees Officers Thomas J. Perna, Chairman John F. Cogan, Jr., President* David R. Bock Daniel K. Kingsbury, Executive John F. Cogan, Jr. Vice President Benjamin M. Friedman Mark E. Bradley, Treasurer** Margaret B.W. Graham Christopher J. Kelley, Secretary Daniel K. Kingsbury Marguerite A. Piret Stephen K. West Investment Adviser and Administrator Pioneer Investment Management, Inc. Custodian and Sub-Administrator Brown Brothers Harriman & Co. Principal Underwriter Pioneer Funds Distributor, Inc. Legal Counsel Bingham McCutchen LLP Shareowner Services and Transfer Agent Pioneer Investment Management Shareholder Services, Inc. Proxy Voting Policies and Procedures of the Fund are available without charge, upon request, by calling our toll free number (1-800-225-6292). Information regarding how the Fund voted proxies relating to portfolio securities during the most recent 12-month period ended June 30 is publicly available to shareowners at us.pioneerinvestments.com. This information is also available on the Securities and Exchange Commission's web site at http://www.sec.gov. * Chief Executive Officer of the Fund ** Chief Financial and Accounting Officer of the Fund 42 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 This page for your notes. Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 43 This page for your notes. 44 Pioneer Fundamental Growth Fund | Semiannual Report | 9/30/12 How to Contact Pioneer We are pleased to offer a variety of convenient ways for you to contact us for assistance or information. Call us for: -------------------------------------------------------------------------------- Account Information, including existing accounts, new accounts, prospectuses, applications and service forms 1-800-225-6292 FactFone(SM) for automated fund yields, prices, account information and transactions 1-800-225-4321 Retirement plans information 1-800-622-0176 Write to us: -------------------------------------------------------------------------------- PIMSS, Inc. P.O. Box 55014 Boston, Massachusetts 02205-5014 Our toll-free fax 1-800-225-4240 Our internet e-mail address ask.pioneer@pioneerinvestments.com (for general questions about Pioneer only) Visit our web site: us.pioneerinvestments.com This report must be preceded or accompanied by a prospectus. The Fund files a complete schedule of investments with the Securities and Exchange Commission for the first and third quarters for each fiscal year on Form N-Q. Shareholders may view the filed Form N-Q by visiting the Commission's web site at http://www.sec.gov. The filed form may also be viewed and copied at the Commission's Public Reference Room in Washington, DC. Information regarding the operations of the Public Reference Room may be obtained by calling 1-800-SEC-0330. [LOGO] PIONEER Invesments(R) Pioneer Investment Management, Inc. 60 State Street Boston, MA 02109 us.pioneerinvestments.com Securities offered through Pioneer Funds Distributor, Inc. 60 State Street, Boston, MA 02109 Underwriter of Pioneer Mutual Funds, Member SIPC (c) 2012 Pioneer Investments 19434-06-1112 Pioneer Absolute Return Credit Fund -------------------------------------------------------------------------------- Semiannual Report | September 30, 2012 -------------------------------------------------------------------------------- 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 47 Notes to Financial Statements 54 Trustees, Officers and Service Providers 66 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 1 President's Letter Dear Shareowner, The U.S. stock market rallied sharply through the third quarter of 2012 amid a sluggish, but nonetheless growing, U.S. economy. We have been cautiously optimistic about the U.S. from the start of the year, and the economic data continue to be encouraging. The housing and auto sectors are benefitting from record-low interest rates. The climate for consumer and business credit has improved, and inflation appears to be subdued. While corporate profits slowed in the third quarter, many U.S. companies continue to have strong balance sheets and to pay attractive dividends* compared to fixed-income securities. All of these factors contributed to gains for investors who owned riskier assets, including equities and higher-yielding corporate bonds. Year to date through September 30, 2012, the Standard & Poor's 500 Index returned 16.35%. In fixed income, the Bank of America Merrill Lynch High Yield Master II Index was up by 12.02% during the same period, while the Barclays Capital Aggregate Bond Index gained 3.99%. Treasury bonds, by contrast, generated a comparatively sluggish return of 1.70%, as measured by the Barclays Capital Intermediate Treasuries Index. Despite this generally positive picture during the first nine months of 2012, investors face powerful macroeconomic challenges in the months ahead. These include the threat of a so-called "fiscal cliff" in the U.S. budget process after the November elections, the European sovereign-debt crisis, and slowing growth in both Europe and China. Investors can continue to count on market volatility tied to these factors, although we remain optimistic that the underlying economic trends are moving in the right direction. At Pioneer, we have long advocated the benefits of staying diversified** and investing for the long term. And while diversification alone does not assure a profit or protect against loss in a declining market, we believe in actively seeking out opportunities in undervalued securities and sectors around the globe. Our advice, as always, is to work closely with a trusted financial advisor to discuss your goals and work together to develop an investment strategy that meets your individual needs. There is no single best strategy that works for every investor. * Dividends are not guaranteed. ** Diversification does not assure a profit or protect against loss in a declining market. 2 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 Pioneer's investment professionals focus on finding good opportunities in both equity and bond markets using the same disciplined investment approach we have used since 1928. Our strategy is to identify undervalued individual securities with the greatest potential for success, carefully weighing risk against reward. Our teams of investment professionals continually monitor and analyze the relative valuations of different sectors and securities globally to help build portfolios that we believe can help you achieve your investment goals. We invite you to learn more about Pioneer and our time-tested approach to investing by consulting with your financial advisor or visiting us online at us.pioneerinvestments.com. We greatly appreciate your trust in us, and we thank you for investing with Pioneer. Sincerely, /s/ Daniel K. Kingsbury Daniel K. Kingsbury President and CEO Pioneer Investment Management USA, Inc. Any information in this shareowner report regarding market or economic trends or the factors influencing the Fund's historical or future performance are statements of opinion as of the date of this report. These statements should not be relied upon for any other purposes. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 3 Portfolio Management Discussion | 9/30/12 Credit-sensitive fixed-income securities delivered solid results during the six-month period ended September 30, 2012, after the markets bounced back from early concerns about the health of the global economic recovery. In the following interview, Michael Temple and Andrew Feltus discuss the factors that influenced the performance of Pioneer Absolute Return Credit Fund during the six-month period ended September 30, 2012. Mr. Temple, senior vice president, director of fixed-income credit research and portfolio manager at Pioneer, and Mr. Feltus, senior vice president and portfolio manager at Pioneer, are members of Pioneer's fixed-income team and are responsible for the day-to-day management of the Fund. Q How did Pioneer Absolute Return Credit Fund perform during the six months ended September 30, 2012? A Pioneer Absolute Return Credit Fund Class A shares returned 5.21% at net asset value during the six-month period ended September 30, 2012, while the Fund's benchmark, the Bank of America Merrill Lynch (BofA ML) U.S. Dollar 3-Month LIBOR Index (the BofA ML Index), returned 0.25%. During the same six-month period, the average return of the 267 mutual funds in Lipper's Absolute Return Funds category was 0.88%. Q How would you describe the market environment during the six-month period ended September 30, 2012? A Throughout the six-month period, global economic factors seemed to have as much of an influence on market trends as domestic issues, with investors closely watching developments in China and Europe as well as in the United States. At the start of the period, on April 1, 2012, high-yield bonds and other perceived riskier asset classes remained in favor with the market, but sentiment abruptly changed as evidence mounted that growth in China and the rest of Asia was slowing, and that the sovereign-debt problems of several European nations had not been solved. In the U.S., fears about the strength of the economic recovery were exacerbated when some corporations began announcing disappointing profit growth. Corporate bonds and other credit-sensitive securities fell out of favor in the spring of 2012, amid renewed fears about a potential global economic slowdown. The market downturn continued through much of the summer of 2012, until the announcements by central banks--particularly the European Central Bank (ECB) and the U.S. Federal Reserve System (the Fed)--of their intentions to inject more liquidity into the global financial system in an effort to stimulate economic growth and encourage job creation. The ECB announced in August 2012 that it could become more active in buying 4 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 the short-term debt of peripheral European nations, including Greece and Spain, in an effort to keep borrowing rates low for national governments on the Continent. Shortly after that, the Fed announced its third round of quantitative easing ("QE3") in an effort to encourage lower interest rates through the purchasing of government securities in the open market. Additionally, monetary authorities in China announced that they also were lowering short-term interest rates and easing credit conditions. The combination of the central banks' announcements helped trigger a sharp rally in the financial markets, and high-yield and other credit-sensitive securities rallied through the end of the period (September 30, 2012), outperforming higher-quality securities. Q How did you manage the Fund in that environment during the six-month period ended September 30, 2012? A Consistent with the Fund's overall strategy, we used three layers of hedges during the period to help manage risks associated with the portfolio's investments in the credit sectors. We used two of the three layers throughout the six-month period. The first of the hedges consists of futures contracts that "short" the Standard & Poor's 500 Index (the S&P 500 Index), and are designed to profit when the S&P Index declines. The second of the hedges consists of volatility contracts, which are based on investors' attitudes about the direction and intensity of stock market trends. Both of the hedging layers were in place throughout the six-month period. The third layer of hedges, consisting of investments in futures contracts for U.S. Treasury investments, was used to protect the portfolio's value when the credit sectors slumped in performance in May of 2012. The disciplined use of that tactic helped to protect the Fund from the more extreme effects of the market downturn. We removed the third hedging layer in time for the Fund's investments to participate in the market rally that occurred later in the summer of 2012. The use of the three layers of hedges was a major factor in the Fund's outperformance of the BofA ML Index during the six-month period. At the end of the period on September 30, 2012, nearly 74% of the portfolio's net assets were invested in below-investment-grade debt, with the largest allocations made to U.S. high-yield corporate bonds (28.6%) and floating-rate bank loans (20.8%). The below-investment-grade component of the portfolio also included event-linked ("catastrophe") bonds issued by insurance companies, convertible securities, and international high-yield investments. At the close of the period on September 30, 2012, 9.12% of the Fund's net assets were invested in U.S. investment-grade securities, underscoring the overall emphasis on credit-sensitive investments in the portfolio. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 5 Q What types of investments most affected the Fund's performance during the six-month period ended September 30, 2012? A The Fund's emphasis on credit-sensitive investments, combined with the aforementioned well-placed use of hedging tactics to control risk, helped the Fund to significantly outperform the BofA ML Index as well as its Lipper peer group average during the six-month period. The continued emphasis on higher-yielding, below-investment-grade securities in the Fund's investment portfolio helped to drive strong performance during the six-month period. By sector and industry, investments in health care, in general, helped the Fund's returns, as the group rebounded from the low valuations to which it had fallen in 2011, amid worries about the effects of the passage of the U.S. Affordable Care Act. Strong performers in health care in the Fund's portfolio during the period included the bonds of Kindred Health Care, a home health care provider, and Vanguard Health Systems, a hospital chain. The Fund's holdings of securities issued by homebuilders also fared well during the period as the housing sector showed signs of bottoming out and stabilizing. KB Homes was a good performer for the Fund in the homebuilding space. Aside from holdings in health care and homebuilders, a wide variety of investments contributed to the Fund's healthy returns during the six-month period, including debt issued by the Russian Government, financial broker Merrill Lynch, energy exploration-and-production company Comstock Resources, and NRE, an independent power producer. A catastrophe bond issued by Eastland Re also fared very well and contributed to the Fund's returns during the six-month period. The Fund did have some holdings that disappointed during the six-month period, including securities issued by: James River Coal, a coal producer that was hurt by weak demand for metallurgical coal; Navistar, a truck manufacturer that encountered difficulty with U.S. government emission standards; and Energia, an Argentinian power producer that was hurt when the national government blocked rate increases, despite the company's rising costs. 6 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 Q What is your investment outlook? A The fundamentals supporting both the economy and corporate profits appear solid, but in the short term, we expect that the capital markets will be highly affected by events that occur as the U.S. government approaches the so-called "fiscal cliff" budget scenario at the end of 2012. Congress is not expected to take any action until sometime after the November elections on three significant financial challenges: the nation's debt ceiling; sequestration, which calls for largely unspecified, but deep, across-the-board spending cuts in the absence of a budget agreement; and the automatic end of the Bush-era tax cuts. If Congress and the President cannot come to an agreement, the "fiscal cliff" would be reached. Obviously, the outcome of the November elections will have a major influence on how all three issues will be approached. If there were a successful resolution to the nation's immediate debt, spending and tax issues, we believe we would see less market volatility and a return by investors to focusing on fundamental investment principles. While the nation's economic growth, as measured by gross domestic product, clearly slowed in the first and second quarters of 2012, we think the prospects for improving economic conditions are good. The more accommodative stances by the major central banks in the U.S., Europe, China and Japan should help to encourage economic expansion as well as an improvement in corporate profits. We think those factors should encourage a higher level of economic growth, especially if the U.S. manages to avoid the "fiscal cliff." In an environment of extremely low interest rates, we think there should be continuing investor appetite for corporate bonds and other credit-sensitive securities that offer yield premiums over high-grade debt. Nevertheless, the currently low absolute level of interest rates does limit the total-return potential of fixed-income investments in general. We plan to watch events carefully and to be ready to make changes to the Fund's hedging position in order to protect against any sudden market volatility, including what could occur in connection with the approaching "fiscal cliff" scenario should a deal in Washington fail to emerge. Please refer to the Schedule of Investments on pages 17-46 for a full listing of Fund securities. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 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 commodities. The value of commodity-linked derivatives may be affected by changes in overall market movements, commodity index volatility, changes in interest rates, factors affecting a particular industry or commodity, international economic, political and regulatory developments, supply and demand, and governmental regulatory policies. 8 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 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. 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 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 | Semiannual Report | 9/30/12 9 Portfolio Summary | 9/30/12 Portfolio Diversification -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] U.S. Corporate Bonds 41.1% International Corporate Bonds 23.3% Senior Secured Loans 22.6% Collateralized Mortgage Obligations 4.7% Convertible Corporate Bonds 3.7% Asset Backed Securities 1.4% Municipal Bonds 1.2% U.S. Preferred Stocks 1.1% Convertible Preferred Stocks 0.5% Foreign Government Bonds 0.4% 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 0.5% AA 0.7% A 4.7% BBB 13.2% BB 29.7% B 32.9% CCC & Lower 6.6% Not Rated 4.5% Cash Equivalents 7.2% 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 debt holdings)* 1. AWAS Aviation Capital, Ltd., Term Loan, 6/25/18 1.43% ------------------------------------------------------------------------------------------- 2. Prudential Financial, Inc., Floating Rate Note, 9/15/42 0.58 ------------------------------------------------------------------------------------------- 3. State Street Capital Trust III, Floating Rate Note, 1/29/49 (Perpetual) 0.57 ------------------------------------------------------------------------------------------- 4. Reynolds Group Issuer, Inc., 9.875%, 8/15/19 0.50 ------------------------------------------------------------------------------------------- 5. Copano Energy LLC, 7.125%, 4/1/21 0.48 ------------------------------------------------------------------------------------------- 6. Transnet SOC, Ltd., 4.0%, 7/26/22 (144A) 0.47 ------------------------------------------------------------------------------------------- 7. Windstream Corp., 7.5%, 6/1/22 0.46 ------------------------------------------------------------------------------------------- 8. Genworth Financial, Inc., 7.2%, 2/15/21 0.43 ------------------------------------------------------------------------------------------- 9. QEP Resources, Inc., 5.25%, 5/1/23 0.43 ------------------------------------------------------------------------------------------- 10. Residential Reinsurance 2010, Ltd., Floating Rate Note, 6/6/13 (Cat Bond) (144A) 0.43 ------------------------------------------------------------------------------------------- * 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 | Semiannual Report | 9/30/12 Prices and Distributions | 9/30/12 Net Asset Value per Share -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 9/30/12 3/31/12 -------------------------------------------------------------------------------- A $9.87 $9.63 -------------------------------------------------------------------------------- C $9.85 $9.61 -------------------------------------------------------------------------------- Y $9.90 $9.66 -------------------------------------------------------------------------------- Distributions per Share: 4/1/12-9/30/12 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains -------------------------------------------------------------------------------- A $0.2540 $ -- $ -- -------------------------------------------------------------------------------- C $0.2176 $ -- $ -- -------------------------------------------------------------------------------- Y $0.2708 $ -- $ -- -------------------------------------------------------------------------------- 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. 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 | Semiannual Report | 9/30/12 11 Performance Update | 9/30/12 Class A Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer 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 September 30, 2012) -------------------------------------------------------------------------------- Net Asset Public Offering Period Value (NAV) Price (POP) -------------------------------------------------------------------------------- Life-of-Class (5/2/11) 3.91% 0.61% 1 Year 10.57 5.64 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated August 1, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 1.66% 1.20% -------------------------------------------------------------------------------- Value of $10,000 Investment [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Pioneer Absolute BofA Merrill Lynch U.S. Return Credit Fund Dollar 3-Month LIBOR Index 4/30/2011 $ 9,550 $ 10,000 9/30/2011 $ 9,122 $ 10,009 9/30/2012 $ 10,086 $ 10,058 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 | Semiannual Report | 9/30/12 Performance Update | 9/30/12 Class C Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer 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 September 30, 2012) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class (5/2/11) 3.03% 3.03% 1 Year 9.63% 9.63% -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated August 1, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 2.46% 2.10% -------------------------------------------------------------------------------- Value of $10,000 Investment [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Pioneer Absolute BofA Merrill Lynch U.S. Return Credit Fund Dollar 3-Month LIBOR Index 4/30/2011 $ 10,000 $ 10,000 9/30/2011 $ 9,517 $ 10,009 9/30/2012 $ 10,434 $ 10,058 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 | Semiannual Report | 9/30/12 13 Performance Update | 9/30/12 Class Y Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 Million investment made in Pioneer 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 September 30, 2012) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class (5/2/11) 4.44% 4.44% 1 Year 10.80 10.80 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated August 1, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 1.30% 0.85% -------------------------------------------------------------------------------- Value of $5 Million Investment [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Pioneer Absolute BofA Merrill Lynch U.S. Return Credit Fund Dollar 3-Month LIBOR Index 4/30/2011 $ 5,000,000 $ 5,000,000 9/30/2011 $ 4,800,067 $ 5,004,742 9/30/2012 $ 5,318,483 $ 5,028,849 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 | Semiannual Report | 9/30/12 Comparing Ongoing Fund Expenses As a shareowner in the Fund, you incur two types of costs: (1) ongoing costs, including management fees, distribution and/or service (12b-1) fees, and other Fund expenses; and (2) transaction costs, including sales charges (loads) on purchase payments. This example is intended to help you understand your ongoing expenses (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. The example is based on an investment of $1,000 at the beginning of the Fund's latest six-month period and held throughout the six months. Using the Tables -------------------------------------------------------------------------------- Actual Expenses The first table below provides information about actual account values and actual expenses. You may use the information in this table, together with the amount you invested, to estimate the expenses that you paid over the period as follows: (1) Divide your account value by $1,000 Example: an $8,600 account value (divided by) $1,000 = 8.6 (2) Multiply the result in (1) above by the corresponding share class's number in the third row under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. Expenses Paid on a $1,000 Investment in Pioneer Absolute Return Credit Fund Based on actual returns from April 1, 2012, through September 30, 2012. -------------------------------------------------------------------------------- Share Class A C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 Value on 4/1/12 -------------------------------------------------------------------------------- Ending Account Value $1,052.10 $1,048.30 $1,053.70 (after expenses) on 9/30/12 -------------------------------------------------------------------------------- Expenses Paid $6.07 $9.86 $4.38 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 1.18%, 1.92%, and 0.85% for Class A, Class C and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 183/365 (to reflect the one-half year period). Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 15 Hypothetical Example for Comparison Purposes The table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the tables are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as sales charges (loads) that are charged at the time of the transaction. Therefore, the table below is useful in comparing ongoing costs only and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher. Expenses Paid on a $1,000 Investment in Pioneer Absolute Return Credit Fund Based on a hypothetical 5% return per year before expenses, reflecting the period from April 1, 2012, through September 30, 2012. -------------------------------------------------------------------------------- Share Class A C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 Value on 4/1/12 -------------------------------------------------------------------------------- Ending Account Value $1,019.15 $1,015.44 $1,020.81 (after expenses) on 9/30/12 -------------------------------------------------------------------------------- Expenses Paid $5.97 $9.70 $4.31 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 1.18%, 1.92%, and 0.85% for Class A, Class C and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 183/365 (to reflect the one-half year period). 16 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 Schedule of Investments | 9/30/12 (unaudited) --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- CONVERTIBLE CORPORATE BONDS -- 3.4% ENERGY -- 0.4% Oil & Gas Exploration & Production -- 0.2% 100,000 BB-/Ba3 Chesapeake Energy Corp., 2.25%, 12/15/38 $ 80,562 100,000 NR/NR Stone Energy Corp., 1.75%, 3/1/17 (144A) 95,188 -------------- $ 175,750 --------------------------------------------------------------------------------------------------------- Oil & Gas Storage & Transportation -- 0.1% 100,000 NR/NR Golar LNG, Ltd., 3.75%, 3/7/17 $ 99,770 --------------------------------------------------------------------------------------------------------- Coal & Consumable Fuels -- 0.1% 223,000 CCC-/B2 James River Coal Co., 3.125%, 3/15/18 $ 73,590 -------------- Total Energy $ 349,110 --------------------------------------------------------------------------------------------------------- CAPITAL GOODS -- 0.7% Electrical Components & Equipment -- 0.2% 100,000 B/B2 General Cable Corp., 4.5%, 11/15/29 (Step) $ 107,000 --------------------------------------------------------------------------------------------------------- Construction & Farm Machinery & Heavy Trucks -- 0.5% 100,000 NR/NR Greenbrier Companies, Inc., 3.5%, 4/1/18 $ 90,312 250,000 B-/NR Meritor, Inc., 4.625%, 3/1/26 (Step) 223,594 100,000 CCC+/NR Navistar International Corp., 3.0%, 10/15/14 88,688 -------------- $ 402,594 -------------- Total Capital Goods $ 509,594 --------------------------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 0.2% Health Care Equipment -- 0.1% 100,000 NR/NR NuVasive, Inc., 2.75%, 7/1/17 $ 95,438 --------------------------------------------------------------------------------------------------------- Health Care Technology -- 0.1% 100,000 NR/NR WebMD Health Corp., 2.25%, 3/31/16 $ 92,500 -------------- Total Health Care Equipment & Services $ 187,938 --------------------------------------------------------------------------------------------------------- PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 0.3% Biotechnology -- 0.3% 50,000 NR/NR Corsicanto, Ltd., 3.5%, 1/15/32 (144A) $ 84,938 130,000 NR/NR PDL BioPharma, Inc., 3.75%, 5/1/15 159,900 -------------- $ 244,838 -------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 244,838 --------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 0.2% Consumer Finance -- 0.2% 115,000 B+/NR DFC Global Corp., 3.25%, 4/15/17 (144A) $ 122,259 -------------- Total Diversified Financials $ 122,259 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 17 Schedule of Investments | 9/30/12 (unaudited) (continued) --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- SOFTWARE & SERVICES -- 0.3% Application Software -- 0.3% 175,000 NR/NR Mentor Graphics Corp., 4.0%, 4/1/31 $ 196,656 -------------- Total Software & Services $ 196,656 --------------------------------------------------------------------------------------------------------- TECHNOLOGY HARDWARE & EQUIPMENT -- 0.3% Computer Storage & Peripherals -- 0.1% 100,000 BB/NR SanDisk Corp., 1.5%, 8/15/17 $ 113,188 --------------------------------------------------------------------------------------------------------- Electronic Components -- 0.2% 180,000 BB+/NR Vishay Intertechnology, Inc., 2.25%, 5/15/41 (144A) $ 134,888 -------------- Total Technology Hardware & Equipment $ 248,076 --------------------------------------------------------------------------------------------------------- SEMICONDUCTORS & SEMICONDUCTOR EQUIPMENT -- 0.9% Semiconductor Equipment -- 0.3% 125,000 BBB-/Baa1 Lam Research Corp., 1.25%, 5/15/18 $ 120,781 100,000 BBB-/NR Novellus Systems, Inc., 2.625%, 5/15/41 111,062 -------------- $ 231,843 --------------------------------------------------------------------------------------------------------- Semiconductors -- 0.6% 50,000 A-/NR Intel Corp., 2.95%, 12/15/35 $ 54,375 30,000 A-/A2 Intel Corp., 3.25%, 8/1/39 36,975 55,000 NR/NR JA Solar Holdings Co., Ltd., 4.5%, 5/15/13 52,250 50,000 NR/NR JinkoSolar Holding Co, Ltd., 4.0%, 5/15/16 (144A) 19,500 150,000 NR/NR ReneSola, Ltd., 4.125%, 3/15/18 (144A) 75,562 250,000 NR/NR SunPower Corp., 4.75%, 4/15/14 236,875 -------------- $ 475,537 -------------- Total Semiconductors & Semiconductor Equipment $ 707,380 --------------------------------------------------------------------------------------------------------- TELECOMMUNICATION SERVICES -- 0.1% Integrated Telecommunication Services -- 0.1% 100,000 B/NR Ciena Corp., 0.875%, 6/15/17 $ 86,062 -------------- Total Telecommunication Services $ 86,062 --------------------------------------------------------------------------------------------------------- TOTAL CONVERTIBLE CORPORATE BONDS (Cost $2,804,048) $ 2,651,913 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 18 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------------------------- Floating S&P/Moody's Shares Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- PREFERRED STOCKS -- 1.0% BANKS -- 0.3% Diversified Banks -- 0.3% 2,250 6.50 A-/A3 US Bancorp, Floating Rate Note, 12/31/99 (Perpetual) $ 65,475 6,000 6.00 A-/A3 US Bancorp, Floating Rate Note, 12/31/99 (Perpetual) 167,880 -------------- $ 233,355 -------------- Total Banks $ 233,355 --------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 0.6% Other Diversified Financial Services -- 0.5% 5,125 7.88 BB/Ba2 Citigroup Capital XIII, Floating Rate Note, 10/30/40 $ 142,731 7,750 8.12 CCC+/B3 GMAC Capital Trust I, Floating Rate Note, 2/15/40 194,602 -------------- $ 337,333 --------------------------------------------------------------------------------------------------------- Consumer Finance -- 0.1% 100 CCC+/B3 Ally Financial, Inc., 7.0%, 12/31/99 (Perpetual) (144A) $ 93,553 -------------- Total Diversified Financials $ 430,886 --------------------------------------------------------------------------------------------------------- TELECOMMUNICATION SERVICES -- 0.1% Integrated Telecommunication Services -- 0.1% 4,400 BBB-/Baa3 Qwest Corp., 7.375%, 6/1/51 $ 118,272 -------------- Total Telecommunication Services $ 118,272 --------------------------------------------------------------------------------------------------------- TOTAL PREFERRED STOCKS (Cost $723,902) $ 782,513 --------------------------------------------------------------------------------------------------------- CONVERTIBLE PREFERRED STOCKS -- 0.2% BANKS -- 0.2% Diversified Banks -- 0.2% 100 BBB+/Ba1 Wells Fargo & Co., 7.5%, 12/31/99 (Perpetual) $ 123,800 -------------- Total Banks $ 123,800 --------------------------------------------------------------------------------------------------------- TOTAL CONVERTIBLE PREFERRED STOCKS (Cost $100,637) $ 123,800 --------------------------------------------------------------------------------------------------------- Principal Amount ($) --------------------------------------------------------------------------------------------------------- ASSET BACKED SECURITIES -- 1.3% MATERIALS -- 0.0% Precious Metals & Minerals -- 0.0% 22,559 BBB/NR Mid-State Capital Trust 2010-1, 7.0%, 12/15/45 (144A) $ 23,528 -------------- Total Materials $ 23,528 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 19 Schedule of Investments | 9/30/12 (unaudited) (continued) --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- CONSUMER SERVICES -- 0.3% Hotels, Resorts & Cruise Lines -- 0.3% 250,000 BB/NR Westgate Resorts LLC, 9.0%, 1/20/25 (144A) $ 251,250 -------------- Total Consumer Services $ 251,250 --------------------------------------------------------------------------------------------------------- BANKS -- 0.9% Thrifts & Mortgage Finance -- 0.9% 85,000 1.27 BB/A2 Bear Stearns Asset Backed Securities Trust, Floating Rate Note, 10/25/34 $ 70,753 100,000 BB/NR CarNow Auto Receivables Trust 2012-1, 6.9%, 11/15/16 (144A) 100,325 75,867 A/B2 Citicorp Residential Mortgage Securities, Inc., 5.836%, 7/25/36 (Step) 75,599 125,000 A/B2 Citicorp Residential Mortgage Securities, Inc., 5.892%, 3/25/37 (Step) 123,772 125,000 A/B1 Citicorp Residential Mortgage Securities, Inc., 5.939%, 7/25/36 (Step) 124,685 36,632 4.46 BBB/Ba1 Countrywide Asset-Backed Certificates, Floating Rate Note, 10/25/35 36,806 99,624 0.39 NR/Caa2 Countrywide Asset-Backed Certificates, Floating Rate Note, 11/25/36 (144A) 81,604 30,978 0.46 B+/B3 RASC Trust, Floating Rate Note, 11/25/35 29,756 6,056 B+/A2 Structured Asset Securities Corp., 4.51%, 2/25/35 (Step) 6,061 -------------- $ 649,361 -------------- Total Banks $ 649,361 --------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 0.1% Other Diversified Financial Services -- 0.1% 67,121 BB/NR Sierra Receivables Funding Co. LLC, 9.31%, 7/20/28 (144A) $ 67,113 -------------- Total Diversified Financials $ 67,113 --------------------------------------------------------------------------------------------------------- TOTAL ASSET BACKED SECURITIES (Cost $945,273) $ 991,252 --------------------------------------------------------------------------------------------------------- COLLATERALIZED MORTGAGE OBLIGATIONS -- 4.3% BANKS -- 2.6% Thrifts & Mortgage Finance -- 2.6% 210,162 2.80 A/NR Banc of America Funding Corp., Floating Rate Note, 11/20/34 $ 182,387 200,000 5.03 NR/Aa1 Citigroup Commercial Mortgage Trust, Floating Rate Note, 9/20/51 (144A) 198,404 77,772 NR/Baa1 Citigroup Mortgage Loan Trust, Inc., 6.75%, 8/25/34 82,854 93,417 0.40 A+/A1 COMM 2007-FL14 Mortgage Trust, Floating Rate Note, 6/15/22 (144A) 89,025 100,000 5.98 NR/A2 COMM 2010-C1 Mortgage Trust, Floating Rate Note, 7/10/46 (144A) 118,900 The accompanying notes are an integral part of these financial statements. 20 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- (continued) 100,000 NR/Baa3 COMM 2011-THL Mortgage Trust, 5.949%, 6/9/28 (144A) $ 104,136 100,000 5.02 NR/Baa3 COMM 2012-CCRE2 Mortgage Trust, Floating Rate Note, 8/15/45 (144A) 87,612 123,310 AAA/Ba1 Countrywide Alternative Loan Trust, 5.75%, 3/25/34 121,808 55,620 5.61 AAA/NR Countrywide Home Loan Mortgage Pass Through Trust, Floating Rate Note, 1/25/33 56,337 100,000 NR/NR GS Mortgage Securities Corp. II, 4.209%, 2/10/21 (144A) 100,830 87,971 CCC/NR GSR Mortgage Loan Trust, 6.0%, 2/25/36 89,570 113,587 5.25 BB+/NR GSR Mortgage Loan Trust, Floating Rate Note, 7/25/35 111,704 262,667 2.96 NR/Caa1 JP Morgan Mortgage Trust, Floating Rate Note, 10/25/35 240,471 20,398 CC/Caa2 Structured Asset Securities Corp., 6.0%, 8/25/35 18,421 64,586 2.66 BBB-/B3 Thornburg Mortgage Securities Trust, Floating Rate Note, 9/25/37 60,986 100,000 NR/Ba2 Wells Fargo Commercial Mortgage Trust, 4.0%, 11/15/43 (144A) 78,297 14,851 NR/B3 Wells Fargo Mortgage Backed Securities Trust, 5.75%, 5/25/36 14,717 48,344 2.64 BBB-/Ba2 Wells Fargo Mortgage Backed Securities Trust, Floating Rate Note, 3/25/35 47,961 50,000 AA-/NR WFDB Commercial Mortgage Trust, 5.914%, 7/5/24 (144A) 52,151 100,000 5.65 NR/Baa3 WFRBS Commercial Mortgage Trust 2011-C2, Floating Rate Note, 2/15/44 (144A) 97,175 50,000 5.42 NR/Baa1 WFRBS Commercial Mortgage Trust 2011-C4, Floating Rate Note, 6/15/44 (144A) 49,914 -------------- $ 2,003,660 -------------- Total Banks $ 2,003,660 --------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 1.4% Other Diversified Financial Services -- 1.0% 113,538 5.63 NR/A2 DBUBS Mortgage Trust, Floating Rate Note, 7/10/44 (144A) $ 125,018 100,000 0.92 BBB+/A3 Morgan Stanley Capital I, Inc., Floating Rate Note, 12/15/20 (144A) 91,956 105,000 7.35 B+/Ba3 Morgan Stanley Capital I, Inc., Floating Rate Note, 7/15/32 (144A) 108,399 80,286 AAA/NR RALI Trust, 6.0%, 10/25/34 81,713 250,000 NR/NR Vericrest Opportunity Loan Transferee, 6.414%, 2/26/52 (144A) 250,000 100,000 8.11 NR/NR Vericrest Opportunity Loan Trust 2012-NPL1, Floating Rate Note, 3/25/49 (144A) $ 101,832 -------------- $ 758,918 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 21 Schedule of Investments | 9/30/12 (unaudited) (continued) --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- Specialized Finance -- 0.2% 125,000 6.00 BB+/NR COBALT CMBS Commercial Mortgage Trust 2007-C3, Floating Rate Note, 5/15/46 $ 128,977 --------------------------------------------------------------------------------------------------------- Consumer Finance -- 0.1% 70,434 5.10 CCC/NR GMAC Mortgage Corp Loan Trust, Floating Rate Note, 5/25/35 $ 69,815 --------------------------------------------------------------------------------------------------------- Investment Banking & Brokerage -- 0.1% 125,000 5.93 BB+/Baa3 Bear Stearns Commercial Mortgage Securities, Floating Rate Note, 9/11/38 $ 112,974 -------------- Total Diversified Financials $ 1,070,684 --------------------------------------------------------------------------------------------------------- REAL ESTATE -- 0.3% Mortgage REITs -- 0.3% 60,628 2.66 AAA/B2 American Home Mortgage Investment Trust, Floating Rate Note, 6/25/45 $ 54,377 175,000 4.18 NR/NR FREMF Mortgage Trust, Floating Rate Note, 5/25/45 (144A) 149,905 -------------- $ 204,282 -------------- Total Real Estate $ 204,282 --------------------------------------------------------------------------------------------------------- GOVERNMENT -- 0.0% Government -- 0.0% 348,547 1.05 NR/NR Government National Mortgage Association, Floating Rate Note, 3/16/53 $ 29,593 -------------- Total Government $ 29,593 --------------------------------------------------------------------------------------------------------- TOTAL COLLATERALIZED MORTGAGE OBLIGATIONS (Cost $3,087,629) $ 3,308,219 --------------------------------------------------------------------------------------------------------- CORPORATE BONDS -- 58.8% ENERGY -- 9.1% Oil & Gas Drilling -- 0.5% 175,000 B/NR Drill Rigs Holdings, Inc., 6.5%, 10/1/17 (144A) $ 173,906 100,000 CCC+/Caa1 Ocean Rig UDW, Inc., 9.5%, 4/27/16 103,000 105,000 BB-/B2 Unit Corp., 6.625%, 5/15/21 (144A) 108,412 -------------- $ 385,318 --------------------------------------------------------------------------------------------------------- Oil & Gas Equipment & Services -- 0.8% 150,000 BB/Ba3 Bristow Group, Inc., 6.25%, 10/15/22 $ 153,562 100,000 B+/B1 Calfrac Holdings LP, 7.5%, 12/1/20 (144A) 99,000 123,000 B/B3 Expro Finance Luxembourg SCA, 8.5%, 12/15/16 (144A) 126,690 100,000 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) 124,800 50,000 BB/Ba3 Oil States International, Inc., 6.5%, 6/1/19 53,125 -------------- $ 654,177 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 22 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- Integrated Oil & Gas -- 0.4% 300,000 BB+/Ba1 QEP Resources, Inc., 5.25%, 5/1/23 $ 306,750 --------------------------------------------------------------------------------------------------------- Oil & Gas Exploration & Production -- 5.5% 200,000 B/B3 Carrizo Oil & Gas, Inc., 7.5%, 9/15/20 $ 204,000 100,000 B-/B3 Chaparral Energy, Inc., 8.25%, 9/1/21 108,000 205,000 B-/B3 Comstock Resources, Inc., 9.5%, 6/15/20 220,375 100,000 BB+/B1 Concho Resources, Inc., 6.5%, 1/15/22 110,250 225,000 B/B2 EP Energy LLC, 7.75%, 9/1/22 (144A) 229,500 100,000 B/B2 EP Energy LLC, 9.375%, 5/1/20 (144A) 109,000 250,000 B-/B3 EV Energy Partners LP, 8.0%, 4/15/19 259,375 285,000 B-/B2 Forest Oil Corp., 7.5%, 9/15/20 (144A) 282,862 200,000 CCC+/Caa1 Goodrich Petroleum Corp., 8.875%, 3/15/19 193,500 150,000 CCC+/B3 Halcon Resources Corp., 9.75%, 7/15/20 (144A) 153,375 100,000 CCC+/Caa1 Kodiak Oil & Gas Corp., 8.125%, 12/1/19 (144A) 106,000 150,000 B-/Caa1 Midstates Petroleum Co, Inc., 10.75%, 10/1/20 (144A) 156,375 100,000 B+/NR MIE Holdings Corp., 9.75%, 5/12/16 (144A) 103,250 100,000 NR/NR National JSC Naftogaz of Ukraine, 9.5%, 9/30/14 101,630 150,000 BBB-/Ba1 Newfield Exploration Co., 5.625%, 7/1/24 166,500 200,000 B-/Caa1 Northern Oil and Gas, Inc., 8.0%, 6/1/20 206,000 200,000 B/B3 Oasis Petroleum, Inc., 6.875%, 1/15/23 212,500 175,000 B-/B3 PDC Energy, Inc., 7.75%, 10/15/22 (144A) 175,000 100,000 B/B3 Penn Virginia Corp., 7.25%, 4/15/19 93,000 160,000 CCC+/Caa1 PetroBakken Energy, Ltd., 8.625%, 2/1/20 (144A) 166,400 140,000 B-/Caa1 QR Energy LP, 9.25%, 8/1/20 (144A) 142,800 115,000 CCC/Caa1 Quicksilver Resources, Inc., 7.125%, 4/1/16 98,325 290,000 B-/B3 Samson Investment Co., 9.75%, 2/15/20 (144A) 298,700 100,000 B/B3 Stone Energy Corp., 8.625%, 2/1/17 107,000 100,000 CCC+/Caa1 Venoco, Inc., 8.875%, 2/15/19 87,000 100,000 B/B3 W&T Offshore, Inc., 8.5%, 6/15/19 109,000 -------------- $ 4,199,717 --------------------------------------------------------------------------------------------------------- Oil & Gas Refining & Marketing -- 0.3% 215,000 BB+/Ba1 Tesoro Corp., 5.375%, 10/1/22 $ 221,450 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 23 Schedule of Investments | 9/30/12 (unaudited) (continued) --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- Oil & Gas Storage & Transportation -- 1.3% 325,000 B/B1 Copano Energy LLC, 7.125%, 4/1/21 $ 339,625 200,000 BBB-/Baa3 DCP Midstream Operating LP, 4.95%, 4/1/22 210,253 100,000 7.00 BB+/Baa3 Enterprise Products Operating LLC, Floating Rate Note, 6/1/67 107,125 95,000 BB/Ba3 MarkWest Energy Partners LP, 6.25%, 6/15/22 102,125 100,000 BBB/Baa2 Sunoco Logistics Partners Operations LP, 6.1%, 2/15/42 110,307 100,000 BBB-/Baa3 The Williams Companies, Inc., 7.75%, 6/15/31 127,911 -------------- $ 997,346 --------------------------------------------------------------------------------------------------------- Coal & Consumable Fuels -- 0.3% 250,000 B-/B2 James River Coal Co., 7.875%, 4/1/19 $ 143,125 75,000 B/B3 Murray Energy Corp., 10.25%, 10/15/15 (144A) 73,500 -------------- $ 216,625 -------------- Total Energy $ 6,981,383 --------------------------------------------------------------------------------------------------------- MATERIALS -- 5.3% Commodity Chemicals -- 0.3% 100,000 CCC+/B3 Hexion US Finance Corp., 8.875%, 2/1/18 $ 102,750 100,000 BB+/Ba2 NOVA Chemicals Corp., 7.875%, 9/15/25 100,750 -------------- $ 203,500 --------------------------------------------------------------------------------------------------------- Diversified Chemicals -- 0.5% 125,000 BB-/Ba3 Celanese US Holdings LLC, 5.875%, 6/15/21 $ 140,000 175,000 CCC+/Caa1 INEOS Group Holdings SA, 8.5%, 2/15/16 (144A) 165,375 90,000 B/B2 Orion Engineered Carbons Bondco GmbH, 9.625%, 6/15/18 (144A) 98,550 -------------- $ 403,925 --------------------------------------------------------------------------------------------------------- Specialty Chemicals -- 0.2% 170,000 BB-/B1 Tronox Finance LLC, 6.375%, 8/15/20 (144A) $ 171,700 --------------------------------------------------------------------------------------------------------- Metal & Glass Containers -- 1.0% 130,000 B-/B3 AEP Industries, Inc., 8.25%, 4/15/19 $ 137,800 111,858 CCC+/Caa1 ARD Finance SA, 11.125%, 6/1/18 (144A) (PIK) 111,299 EURO 100,000 CCC+/B3 Ardagh Glass Finance Plc, 8.75%, 2/1/20 (144A) 128,515 EURO 150,000 B+/Ba3 Ardagh Packaging Finance Plc, 7.375%, 10/15/17 (144A) 204,821 EURO 100,000 BB+/Ba2 OI European Group BV, 6.75%, 9/15/20 (144A) 142,652 -------------- $ 725,087 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 24 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- Paper Packaging -- 0.5% 200,000 B+/Ba3 Cascades, Inc., 7.875%, 1/15/20 $ 209,500 100,000 CCC+/Caa2 Exopack Holding Corp., 10.0%, 6/1/18 96,000 50,000 B/B3 Packaging Dynamics Corp., 8.75%, 2/1/16 (144A) 52,750 -------------- $ 358,250 --------------------------------------------------------------------------------------------------------- Aluminum -- 0.2% 150,000 BBB-/Baa3 Alcoa, Inc., 6.15%, 8/15/20 $ 165,535 --------------------------------------------------------------------------------------------------------- Diversified Metals & Mining -- 1.0% 200,000 BBB-/Baa3 Gold Fields Orogen Holding BVI, Ltd., 4.875%, 10/7/20 (144A) $ 203,422 75,000 BB-/B1 KGHM International, Ltd., 7.75%, 6/15/19 (144A) 77,250 100,000 CCC+/Caa1 Midwest Vanadium Pty, Ltd., 11.5%, 2/15/18 (144A) 61,000 200,000 CCC+/Caa1 Mirabela Nickel, Ltd., 8.75%, 4/15/18 (144A) 150,000 100,000 CCC+/B3 Molycorp, Inc., 10.0%, 6/1/20 (144A) 99,000 200,000 BB/Ba3 Vedanta Resources Plc, 8.25%, 6/7/21 (144A) 194,000 -------------- $ 784,672 --------------------------------------------------------------------------------------------------------- Gold -- 0.2% 180,000 BB-/B1 IAMGOLD Corp., 6.75%, 10/1/20 (144A) $ 176,400 --------------------------------------------------------------------------------------------------------- Steel -- 0.7% 100,000 B/B3 Essar Steel Algoma, Inc., 9.375%, 3/15/15 (144A) $ 95,250 100,000 B/B3 JMC Steel Group, 8.25%, 3/15/18 (144A) 102,000 100,000 NR/B2 Metinvest BV, 8.75%, 2/14/18 (144A) 95,250 120,000 BB+/Ba2 Steel Dynamics, Inc., 6.125%, 8/15/19 (144A) 124,800 120,000 BB+/Ba2 Steel Dynamics, Inc., 6.375%, 8/15/22 (144A) 123,900 -------------- $ 541,200 --------------------------------------------------------------------------------------------------------- Paper Products -- 0.7% 200,000 B+/B1 Appleton Papers, Inc., 10.5%, 6/15/15 (144A) $ 212,500 120,000 BB+/Ba1 PH Glatfelter Co., 5.375%, 10/15/20 (144A) 121,200 200,000 BB/Ba2 Sappi Papier Holding GmbH, 6.625%, 4/15/21 (144A) 192,000 -------------- $ 525,700 -------------- Total Materials $ 4,055,969 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 25 Schedule of Investments | 9/30/12 (unaudited) (continued) --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- CAPITAL GOODS -- 4.0% Aerospace & Defense -- 0.1% 100,000 B-/B2 DynCorp International, Inc., 10.375%, 7/1/17 $ 86,250 --------------------------------------------------------------------------------------------------------- Building Products -- 0.3% 50,000 BBB-/Ba2 Masco Corp., 5.95%, 3/15/22 $ 54,776 135,000 BBB-/Ba2 Masco Corp., 7.125%, 3/15/20 153,673 -------------- $ 208,449 --------------------------------------------------------------------------------------------------------- Construction & Engineering -- 0.7% 200,000 B+/B1 Abengoa Finance SAU, 8.875%, 11/1/17 (144A) $ 185,000 150,000 B+/B1 Empresas ICA SAB de CV, 8.375%, 7/24/17 (144A) 156,375 200,000 B+/B1 Empresas ICA SAB de CV, 8.9%, 2/4/21 (144A) 209,000 -------------- $ 550,375 --------------------------------------------------------------------------------------------------------- Electrical Components & Equipment -- 0.4% 200,000 B/B3 Coleman Cable, Inc., 9.0%, 2/15/18 $ 213,000 100,000 B/B3 WireCo WorldGroup, Inc., 9.5%, 5/15/17 107,000 -------------- $ 320,000 --------------------------------------------------------------------------------------------------------- Industrial Conglomerates -- 0.7% 100,000 BB-/Ba2 Boart Longyear Management Pty, Ltd., 7.0%, 4/1/21 (144A) $ 102,625 100,000 B/NR Cia Latinoamericana de Infraestructura & Servicios SA, 9.5%, 12/15/16 65,000 200,000 B+/B2 JB Poindexter & Co., Inc., 9.0%, 4/1/22 (144A) 200,000 150,000 CCC+/B3 Park-Ohio Industries, Inc., 8.125%, 4/1/21 155,250 -------------- $ 522,875 --------------------------------------------------------------------------------------------------------- Construction & Farm Machinery & Heavy Trucks -- 0.2% 100,000 B/B2 Commercial Vehicle Group, Inc., 7.875%, 4/15/19 $ 101,000 100,000 CCC+/B2 Navistar International Corp., 8.25%, 11/1/21 94,875 -------------- $ 195,875 --------------------------------------------------------------------------------------------------------- Industrial Machinery -- 0.7% 100,000 B/Caa2 Liberty Tire Recycling, 11.0%, 10/1/16 (144A) $ 97,000 100,000 CCC+/Caa2 Mueller Water Products, Inc., 7.375%, 6/1/17 102,500 200,000 B+/NR WPE International Cooperatief UA, 10.375%, 9/30/20 (144A) 170,000 198,000 B/B3 Xerium Technologies, Inc., 8.875%, 6/15/18 175,230 -------------- $ 544,730 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 26 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- Trading Companies & Distributors -- 0.9% 200,000 BB+/NR Aviation Capital Group Corp., 6.75%, 4/6/21 (144A) $ 203,880 175,000 B+/B3 H&E Equipment Services, Inc., 7.0%, 9/1/22 (144A) 182,000 100,000 B-/B3 INTCOMEX, Inc., 13.25%, 12/15/14 102,000 55,000 B+/B3 UR Merger Sub Corp., 7.375%, 5/15/20 (144A) 59,125 100,000 B+/B3 UR Merger Sub Corp., 7.625%, 4/15/22 (144A) 109,500 -------------- $ 656,505 -------------- Total Capital Goods $ 3,085,059 --------------------------------------------------------------------------------------------------------- COMMERCIAL SERVICES & SUPPLIES -- 0.1% Diversified Support Services -- 0.1% 100,000 B/B3 ADS Tactical, Inc., 11.0%, 4/1/18 (144A) $ 99,750 -------------- Total Commercial Services & Supplies $ 99,750 --------------------------------------------------------------------------------------------------------- TRANSPORTATION -- 1.7% Air Freight & Logistics -- 0.2% 200,000 B-/Ba3 CEVA Group Plc, 8.375%, 12/1/17 (144A) $ 192,750 --------------------------------------------------------------------------------------------------------- Airlines -- 0.3% 49,590 BB+/Ba2 Continental Airlines 1997-4 Class B Pass Through Trust, 6.9%, 1/2/17 $ 51,573 49,861 BB-/Ba1 Continental Airlines 2001-1 Class B Pass Through Trust, 7.373%, 12/15/15 53,416 100,000 BB+/Ba3 Delta Air Lines 2010-1 Class B Pass Through Trust, 6.375%, 1/2/16 100,000 -------------- $ 204,989 --------------------------------------------------------------------------------------------------------- Marine -- 0.2% 160,000 B+/B3 Navios South American Logistics, Inc., 9.25%, 4/15/19 $ 150,400 --------------------------------------------------------------------------------------------------------- Trucking -- 0.8% 150,000 BBB-/Baa2 Asciano Finance, Ltd., 5.0%, 4/7/18 (144A) $ 161,095 100,000 B/B3 syncreon Global Ireland, Ltd., 9.5%, 5/1/18 (144A) 104,250 325,000 BBB+/A3 Transnet SOC, Ltd., 4.0%, 7/26/22 (144A) 330,362 -------------- $ 595,707 --------------------------------------------------------------------------------------------------------- Airport Services -- 0.2% 93,000 B/B2 Aeropuertos Argentina 2000 SA, 10.75%, 12/1/20 (144A) $ 91,605 100,000 B/B2 Aguila 3 SA, 7.875%, 1/31/18 (144A) 105,000 -------------- $ 196,605 -------------- Total Transportation $ 1,340,451 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 27 Schedule of Investments | 9/30/12 (unaudited) (continued) --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- AUTOMOBILES & COMPONENTS -- 1.2% Auto Parts & Equipment -- 0.3% 200,000 B/Caa1 International Automotive Components Group SA, 9.125%, 6/1/18 (144A) $ 192,000 100,000 B+/B2 Pittsburgh Glass Works LLC, 8.5%, 4/15/16 (144A) 93,000 -------------- $ 285,000 --------------------------------------------------------------------------------------------------------- Tires & Rubber -- 0.6% 200,000 BB-/B2 Cooper Tire & Rubber Co., 8.0%, 12/15/19 $ 227,000 210,000 B+/B1 The Goodyear Tire & Rubber Co., 7.0%, 5/15/22 222,600 -------------- $ 449,600 --------------------------------------------------------------------------------------------------------- Automobile Manufacturers -- 0.3% 100,000 NR/Ba1 Automotores Gildemeister SA, 8.25%, 5/24/21 (144A) $ 108,750 100,000 B/B2 Chrysler Group LLC, 8.25%, 6/15/21 106,500 -------------- $ 215,250 -------------- Total Automobiles & Components $ 949,850 --------------------------------------------------------------------------------------------------------- CONSUMER DURABLES & APPAREL -- 1.6% Homebuilding -- 0.8% 100,000 NR/Ba3 Desarrolladora Homex SAB de CV, 9.5%, 12/11/19 (144A) $ 102,000 55,000 NR/Ba3 Desarrolladora Homex SAB de CV, 9.75%, 3/25/20 (144A) 56,100 200,000 B/B2 KB Home, 8.0%, 3/15/20 221,500 95,000 BB-/B1 The Ryland Group, Inc., 5.375%, 10/1/22 95,238 200,000 NR/Ba3 Urbi Desarrollos Urbanos SAB de CV, 9.5%, 1/21/20 (144A) 176,000 -------------- $ 650,838 --------------------------------------------------------------------------------------------------------- Housewares & Specialties -- 0.5% 330,000 CCC+/Caa2 Reynolds Group Issuer, Inc., 9.875%, 8/15/19 $ 351,038 --------------------------------------------------------------------------------------------------------- Leisure Products -- 0.1% EURO 100,000 CCC/Caa2 Heckler & Koch GmbH, 9.5%, 5/15/18 (144A) $ 108,595 --------------------------------------------------------------------------------------------------------- Footwear -- 0.2% 115,000 NR/B2 Wolverine World Wide, Inc., 6.125%, 10/15/20 (144A) $ 118,450 -------------- Total Consumer Durables & Apparel $ 1,228,921 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 28 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- CONSUMER SERVICES -- 1.7% Casinos & Gaming -- 1.1% 295,000 B-/Caa2 Codere Finance Luxembourg SA, 9.25%, 2/15/19 (144A) $ 241,900 EURO 200,000 8.25 BB/Ba2 Lottomatica Group S.p.A., Floating Rate Note, 3/31/66 (144A) 252,642 250,000 B-/B3 MGM Resorts International, 6.75%, 10/1/20 (144A) 250,000 100,000 BB-/B1 Scientific Games International, Inc., 9.25%, 6/15/19 111,000 -------------- $ 855,542 --------------------------------------------------------------------------------------------------------- Hotels, Resorts & Cruise Lines -- 0.3% 200,000 CCC+/B2 Seven Seas Cruises S de RL LLC, 9.125%, 5/15/19 $ 208,000 --------------------------------------------------------------------------------------------------------- Specialized Consumer Services -- 0.3% 260,000 BB/Ba3 Sotheby's, 5.25%, 10/1/22 (144A) $ 262,600 -------------- Total Consumer Services $ 1,326,142 --------------------------------------------------------------------------------------------------------- MEDIA -- 1.3% Broadcasting -- 1.1% 100,000 BB-/B1 CCO Holdings LLC, 6.5%, 4/30/21 $ 107,000 250,000 CCC+/B3 Cumulus Media Holdings, Inc., 7.75%, 5/1/19 243,125 100,000 CCC+/Caa3 Intelsat Luxembourg SA, 11.5%, 2/4/17 106,000 EURO 100,000 B+/B1 Nara Cable Funding, Ltd., 8.875%, 12/1/18 (144A) 117,591 150,000 B+/B2 Univision Communications, Inc., 6.875%, 5/15/19 (144A) 154,500 100,000 CCC+/Caa2 Univision Communications, Inc., 8.5%, 5/15/21 (144A) 101,500 -------------- $ 829,716 --------------------------------------------------------------------------------------------------------- Movies & Entertainment -- 0.1% 100,000 CCC+/Caa1 Production Resource Group, Inc., 8.875%, 5/1/19 $ 70,000 --------------------------------------------------------------------------------------------------------- Publishing -- 0.1% 100,000 B-/B3 MPL 2 Acquisition Canco, Inc., 9.875%, 8/15/18 (144A) $ 89,500 -------------- Total Media $ 989,216 --------------------------------------------------------------------------------------------------------- RETAILING -- 0.5% Department Stores -- 0.2% 100,000 B/NR Grupo Famsa SAB de CV, 11.0%, 7/20/15 (144A) $ 106,500 --------------------------------------------------------------------------------------------------------- Apparel Retail -- 0.3% 250,000 B/B3 Brown Shoe Co., Inc., 7.125%, 5/15/19 $ 255,625 -------------- Total Retailing $ 362,125 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 29 Schedule of Investments | 9/30/12 (unaudited) (continued) --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- FOOD, BEVERAGE & TOBACCO -- 1.9% Soft Drinks -- 0.1% 35,000 BB/Ba2 Central American Bottling Corp., 6.75%, 2/9/22 (144A) $ 37,800 --------------------------------------------------------------------------------------------------------- Packaged Foods & Meats -- 1.5% 75,000 B/NR Agrokor DD, 8.875%, 2/1/20 (144A) $ 75,000 200,000 BBB-/Baa3 BRF -- Brasil Foods SA, 5.875%, 6/6/22 (144A) 218,500 200,000 B/B3 FAGE Dairy Industry SA, 9.875%, 2/1/20 (144A) 196,500 100,000 B+/B2 Marfrig Holding Europe BV, 8.375%, 5/9/18 (144A) 81,500 100,000 B+/B2 Marfrig Overseas, Ltd., 9.5%, 5/4/20 (144A) 82,650 200,000 B+/B2 Minerva Overseas II, Ltd., 10.875%, 11/15/19 (144A) 221,000 100,000 B-/Caa1 Pilgrim's Pride Corp., 7.875%, 12/15/18 $ 95,250 200,000 B+/B1 Post Holdings, Inc., 7.375%, 2/15/22 (144A) 212,500 -------------- $ 1,182,900 --------------------------------------------------------------------------------------------------------- Tobacco -- 0.3% 200,000 B-/B3 Alliance One International, Inc., 10.0%, 7/15/16 $ 207,000 -------------- Total Food, Beverage & Tobacco $ 1,427,700 --------------------------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 3.2% Health Care Equipment -- 0.5% 200,000 BB/B2 Hologic, Inc., 6.25%, 8/1/20 (144A) $ 212,000 150,000 B+/B2 Physio-Control International, Inc., 9.875%, 1/15/19 (144A) 164,250 -------------- $ 376,250 --------------------------------------------------------------------------------------------------------- Health Care Supplies -- 0.3% 100,000 B/Caa1 ConvaTec Healthcare E SA, 10.5%, 12/15/18 (144A) $ 108,500 100,000 B-/Caa1 Immucor, Inc., 11.125%, 8/15/19 113,000 -------------- $ 221,500 --------------------------------------------------------------------------------------------------------- Health Care Services -- 0.3% 200,000 CCC/Caa2 Gentiva Health Services, Inc., 11.5%, 9/1/18 $ 188,750 75,000 CCC+/Caa1 Rural Metro Corp., 10.125%, 7/15/19 (144A) 74,438 -------------- $ 263,188 --------------------------------------------------------------------------------------------------------- Health Care Facilities -- 1.5% 100,000 B+/B1 Aviv Healthcare Properties LP, 7.75%, 2/15/19 $ 106,000 200,000 B/B3 Capella Healthcare, Inc., 9.25%, 7/1/17 213,250 215,000 B/B3 CHS, 7.125%, 7/15/20 229,378 The accompanying notes are an integral part of these financial statements. 30 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- Health Care Facilities -- (continued) 300,000 B-/B3 Kindred Healthcare, Inc., 8.25%, 6/1/19 $ 291,750 100,000 CCC+/NR United Surgical Partners International, Inc., 9.0%, 4/1/20 (144A) 108,500 200,000 B-/B3 Vanguard Health Holding Co. II LLC, 7.75%, 2/1/19 212,750 3,000 CCC+/Caa1 Vanguard Health Systems, Inc., 0.0%, 2/1/16 (c) 2,100 -------------- $ 1,163,728 --------------------------------------------------------------------------------------------------------- Health Care Technology -- 0.6% 200,000 CCC+/Caa1 Emdeon, Inc., 11.0%, 12/31/19 (144A) $ 227,000 175,000 B-/B3 MedAssets, Inc., 8.0%, 11/15/18 190,750 -------------- $ 417,750 -------------- Total Health Care Equipment & Services $ 2,442,416 --------------------------------------------------------------------------------------------------------- PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 0.6% Biotechnology -- 0.4% 155,000 BB-/B1 VPI Escrow Corp., 6.375%, 10/15/20 (144A) $ 158,100 130,000 BB-/B3 Warner Chilcott Co. LLC, 7.75%, 9/15/18 138,775 -------------- $ 296,875 --------------------------------------------------------------------------------------------------------- Pharmaceuticals -- 0.2% 110,000 NR/Caa1 Sky Growth Acquisition Corp., 7.375%, 10/15/20 (144A) $ 110,550 55,000 NR/B1 Valeant Pharmaceuticals International, 6.375%, 10/15/20 (144A) 56,100 -------------- $ 166,650 -------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 463,525 --------------------------------------------------------------------------------------------------------- BANKS -- 3.1% Diversified Banks -- 1.3% 200,000 NR/Ba2 Banco GNB Sudameris SA, 7.5%, 7/30/22 (144A) $ 215,263 100,000 NR/Baa2 Bancolombia SA, 5.95%, 6/3/21 112,500 250,000 BBB/NR BBVA Banco Continental SA, 5.0%, 8/26/22 (144A) 256,875 150,000 NR/A3 BBVA Bancomer SA Texas, 6.5%, 3/10/21 (144A) 164,325 250,000 A/Baa1 Nordea Bank AB, 4.25%, 9/21/22 (144A) 248,451 -------------- $ 997,414 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 31 Schedule of Investments | 9/30/12 (unaudited) (continued) --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- Regional Banks -- 1.6% 125,000 BB+/Baa3 Capital One Capital VI, 8.875%, 5/15/40 $ 127,095 250,000 A/A2 HSBC Bank USA NA New York NY, 6.0%, 8/9/17 291,438 150,000 6.75 BBB/Baa3 PNC Financial Services Group, Inc., Floating Rate Note, 7/29/49 (Perpetual) 167,630 400,000 5.38 BBB+/Baa1 State Street Capital Trust III, Floating Rate Note, 1/29/49 (Perpetual) 400,052 250,000 BBB-/NR UBS AG, 7.625%, 8/17/22 $ 261,390 -------------- $ 1,247,605 --------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- 0.2% 100,000 BBB-/Baa2 Astoria Financial Corp., 5.0%, 6/19/17 $ 103,875 -------------- Total Banks $ 2,348,894 --------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 7.3% Other Diversified Financial Services -- 4.7% 150,000 A-/Baa2 Citigroup, Inc., 5.375%, 8/9/20 $ 173,418 250,000 10.25 BB-/NR Compass Re, Ltd., Floating Rate Note, 1/8/15 (Cat Bond) (144A) 258,775 250,000 11.25 B+/NR Compass Re, Ltd., Floating Rate Note, 1/8/15 (Cat Bond) (144A) 257,925 250,000 9.00 BB/NR East Lane Re V, Ltd., Floating Rate Note, 3/16/16 (Cat Bond) (144A) 268,225 200,000 7.12 AA-/Baa1 General Electric Capital Corp., Floating Rate Note, 12/15/49 (Perpetual) 222,884 200,000 A/A2 JPMorgan Chase & Co., 4.35%, 8/15/21 220,436 100,000 7.90 BBB/Ba1 JPMorgan Chase & Co., Floating Rate Note, 4/29/49 (Perpetual) 113,573 250,000 6.00 BB/NR Lodestone Re, Ltd., Floating Rate Note, 1/8/14 (Cat Bond) (144A) 250,400 250,000 7.25 BB/NR Lodestone Re, Ltd., Floating Rate Note, 1/8/14 (Cat Bond) (144A) 252,350 250,000 6.25 BB/NR Lodestone Re, Ltd., Floating Rate Note, 5/17/13 (Cat Bond) (144A) 252,775 250,000 9.98 BB-/NR Loma Reinsurance, Ltd., Floating Rate Note, 12/21/12 (Cat Bond) (144A) 251,200 250,000 7.50 BB-/NR Queen Street IV Capital, Ltd., Floating Rate Note, 4/9/15 (Cat Bond) (144A) 245,850 250,000 8.50 B+/NR Queen Street V Re, Ltd., Floating Rate Note, 4/9/15 (Cat Bond) (144A) 250,850 300,000 6.25 BB/NR Residential Reinsurance 2010, Ltd., Floating Rate Note, 6/6/13 (Cat Bond) (144A) 306,420 250,000 8.00 BB-/NR Residential Reinsurance 2012, Ltd., Floating Rate Note, 6/6/16 (Cat Bond) (144A) 254,225 100,000 7.70 BBB/NR Tiers Trust, Floating Rate Note, 10/15/97 (144A) (d) 58,770 -------------- $ 3,638,076 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 32 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- Specialized Finance -- 0.6% 200,000 BBB/Baa3 Cantor Fitzgerald LP, 7.875%, 10/15/19 (144A) $ 206,560 250,000 5.25 BB+/NR Kibou, Ltd., Floating Rate Note, 2/16/15 (Cat Bond) (144A) $ 254,400 -------------- $ 460,960 --------------------------------------------------------------------------------------------------------- Consumer Finance -- 0.3% 150,000 CCC/Caa1 Springleaf Finance Corp., 6.9%, 12/15/17 $ 127,500 100,000 NR/NR Tarjeta Naranja SA, 9.0%, 1/28/17 (144A) 97,000 -------------- $ 224,500 --------------------------------------------------------------------------------------------------------- Asset Management & Custody Banks -- 0.5% 250,000 A/NR Blackstone Holdings Finance Co. LLC, 6.25%, 8/15/42 (144A) $ 265,269 100,000 BB+/Ba1 Neuberger Berman Group LLC, 5.625%, 3/15/20 (144A) 106,500 -------------- $ 371,769 --------------------------------------------------------------------------------------------------------- Investment Banking & Brokerage -- 1.2% 100,000 4.00 BB+/Ba2 Goldman Sachs Capital II, Floating Rate Note, 6/1/43 $ 75,316 100,000 BBB/A3 Macquarie Bank, Ltd., 6.625%, 4/7/21 (144A) 107,010 150,000 A-/Baa2 Merrill Lynch & Co., Inc., 5.0%, 2/3/14 156,195 200,000 BBB+/Baa3 Merrill Lynch & Co., Inc., 7.75%, 5/14/38 251,171 150,000 NR/Baa3 Scottrade Financial Services, Inc., 6.125%, 7/11/21 (144A) 154,786 150,000 A-/A3 The Goldman Sachs Group, Inc., 5.25%, 7/27/21 165,365 -------------- $ 909,843 -------------- Total Diversified Financials $ 5,605,148 --------------------------------------------------------------------------------------------------------- INSURANCE -- 7.5% Insurance Brokers -- 1.1% 200,000 CCC/Caa2 Alliant Holdings I, Inc., 11.0%, 5/1/15 (144A) $ 206,000 300,000 CCC+/Caa2 Hub International, Ltd., 8.125%, 10/15/18 (144A) 303,750 GBP 100,000 NR/Ba3 Towergate Finance Plc, 8.5%, 2/15/18 (144A) 157,316 100,000 CCC/Caa2 USI Holdings Corp., 9.75%, 5/15/15 (144A) 101,125 100,000 4.31 CCC/Caa1 USI Holdings Corp., Floating Rate Note, 11/15/14 (144A) 96,750 -------------- $ 864,941 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 33 Schedule of Investments | 9/30/12 (unaudited) (continued) --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- Life & Health Insurance -- 0.8% 150,000 B+/Ba3 CNO Financial Group, Inc., 6.375%, 10/1/20 (144A) $ 153,000 400,000 5.88 BBB+/Baa3 Prudential Financial, Inc., Floating Rate Note, 9/15/42 410,000 -------------- $ 563,000 --------------------------------------------------------------------------------------------------------- Multi-line Insurance -- 0.7% 300,000 BBB/Baa3 Genworth Financial, Inc., 7.2%, 2/15/21 $ 306,750 225,000 7.00 BB/Baa3 Liberty Mutual Group, Inc., Floating Rate Note, 3/15/37 (144A) 213,750 -------------- $ 520,500 --------------------------------------------------------------------------------------------------------- Property & Casualty Insurance -- 0.9% 250,000 BBB-/Baa3 Fidelity National Financial, Inc., 5.5%, 9/1/22 $ 268,002 100,000 BBB/Baa2 OneBeacon US Holdings, Inc., 5.875%, 5/15/13 102,367 110,000 7.51 BB+/Ba2 Sirius International Group, Ltd., Floating Rate Note, 5/29/49 (Perpetual) (144A) 112,108 250,000 6.50 BBB-/Ba1 XL Group Plc, Floating Rate Note, 12/29/49 (Perpetual) 230,000 -------------- $ 712,477 --------------------------------------------------------------------------------------------------------- Reinsurance -- 4.0% 250,000 14.00 B-/NR Blue Fin, Ltd., Floating Rate Note, 5/28/13 (Cat Bond) (144A) $ 259,500 250,000 10.00 NR/B1 Combine Re, Ltd., Floating Rate Note, 1/7/15 (Cat Bond) (144A) 262,525 250,000 6.00 BB+/NR Longpoint Re, Ltd., Floating Rate Note, 6/12/15 (Cat Bond) (144A) 262,575 250,000 10.16 B/NR Montana Re, Ltd., Floating Rate Note, 12/7/12 (Cat Bond) (144A) 251,475 250,000 9.00 BB/NR Mystic Re, Ltd., Floating Rate Note, 3/12/15 (Cat Bond) (144A) 259,750 250,000 12.00 B/NR Mystic Re, Ltd., Floating Rate Note, 3/12/15 (Cat Bond) (144A) 264,400 250,000 11.41 NR/B2 Mythen, Ltd., Floating Rate Note, 5/7/15 (Cat Bond) (144A) 263,025 250,000 6.75 BBB-/Baa3 Reinsurance Group of America, Inc., Floating Rate Note, 12/15/65 243,942 250,000 13.17 B-/NR Successor X, Ltd., Floating Rate Note, 1/7/14 (Cat Bond) (144A) 254,075 250,000 9.66 B/NR Successor X, Ltd., Floating Rate Note, 2/25/14 (Cat Bond) (144A) 251,725 250,000 13.00 NR/NR Successor X, Ltd., Floating Rate Note, 2/25/14 (Cat Bond) (144A) 255,575 200,000 BBB+/Baa2 Validus Holdings, Ltd., 8.875%, 1/26/40 $ 253,678 -------------- $ 3,082,245 -------------- Total Insurance $ 5,743,163 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 34 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- REAL ESTATE -- 1.2% Diversified REITs -- 0.5% 100,000 B+/Ba3 CNL Lifestyle Properties, Inc., 7.25%, 4/15/19 $ 94,750 250,000 BBB/Baa2 Goodman Funding Pty, Ltd., 6.375%, 4/15/21 (144A) 274,419 -------------- $ 369,169 --------------------------------------------------------------------------------------------------------- Specialized REITs -- 0.7% 250,000 BBB-/Baa2 Hospitality Properties Trust, 5.0%, 8/15/22 $ 262,636 100,000 BB-/B1 Sabra Health Care LP, 8.125%, 11/1/18 109,500 150,000 BBB/Baa2 Ventas Realty LP, 4.75%, 6/1/21 164,855 $ 536,991 -------------- Total Real Estate $ 906,160 --------------------------------------------------------------------------------------------------------- SOFTWARE & SERVICES -- 0.5% Internet Software & Services -- 0.4% 100,000 BB-/Ba2 Equinix, Inc., 7.0%, 7/15/21 $ 112,000 205,000 BB-/B1 j2 Global, Inc., 8.0%, 8/1/20 (144A) 207,050 -------------- $ 319,050 --------------------------------------------------------------------------------------------------------- Application Software -- 0.1% 90,000 BB-/Ba3 Nuance Communications, Inc., 5.375%, 8/15/20 (144A) $ 92,925 -------------- Total Software & Services $ 411,975 --------------------------------------------------------------------------------------------------------- TECHNOLOGY HARDWARE & EQUIPMENT -- 1.3% Communications Equipment -- 0.5% 260,000 B/B3 CommScope, Inc., 8.25%, 1/15/19 (144A) $ 280,800 100,000 B+/NR ViaSat, Inc., 6.875%, 6/15/20 103,000 -------------- $ 383,800 --------------------------------------------------------------------------------------------------------- Computer Hardware -- 0.2% 185,000 BB/Ba2 NCR Corp., 5.0%, 7/15/22 (144A) $ 186,850 --------------------------------------------------------------------------------------------------------- Computer Storage & Peripherals -- 0.3% 200,000 BB+/Ba1 Seagate HDD Cayman, 7.0%, 11/1/21 $ 214,000 --------------------------------------------------------------------------------------------------------- Electronic Equipment Manufacturers -- 0.3% 200,000 BB-/B2 Viasystems, Inc., 7.875%, 5/1/19 (144A) $ 199,500 -------------- Total Technology Hardware & Equipment $ 984,150 --------------------------------------------------------------------------------------------------------- SEMICONDUCTORS & SEMICONDUCTOR EQUIPMENT -- 0.4% Semiconductor Equipment -- 0.2% 150,000 B+/Caa1 MEMC Electronic Materials, Inc., 7.75%, 4/1/19 $ 123,000 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 35 Schedule of Investments | 9/30/12 (unaudited) (continued) --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- Semiconductors -- 0.2% 195,000 BB-/Ba3 Advanced Micro Devices, Inc., 7.5%, 8/15/22 (144A) $ 188,175 -------------- Total Semiconductors & Semiconductor Equipment $ 311,175 --------------------------------------------------------------------------------------------------------- TELECOMMUNICATION SERVICES -- 3.1% Integrated Telecommunication Services -- 2.2% 150,000 BB/Baa3 CenturyLink, Inc., 7.6%, 9/15/39 $ 158,644 220,000 B/B1 Cincinnati Bell, Inc., 8.375%, 10/15/20 236,500 250,000 BB/Ba2 Frontier Communications Corp., 8.75%, 4/15/22 283,750 155,000 NR/Ba3 GTP Acquisition Partners I LLC, 7.628%, 6/15/16 (144A) 161,081 125,000 BBB/Baa2 Telefonica Emisiones SAU, 6.221%, 7/3/17 130,625 EURO 200,000 B+/Ba3 Telenet Finance III Luxembourg SCA, 6.625%, 2/15/21 (144A) 264,420 100,000 BB-/B1 tw telecom holdings inc, 5.375%, 10/1/22 (144A) 102,000 305,000 B/Ba3 Windstream Corp., 7.5%, 6/1/22 323,300 -------------- $ 1,660,320 --------------------------------------------------------------------------------------------------------- Wireless Telecommunication Services -- 0.9% 200,000 NR/Caa1 Digicel Group, Ltd., 8.25%, 9/30/20 (144A) $ 210,000 150,000 B/B3 Intelsat Jackson Holdings SA, 7.5%, 4/1/21 162,375 100,000 B/B2 MetroPCS Wireless, Inc., 7.875%, 9/1/18 108,000 200,000 BB/Ba3 VimpelCom Holdings BV, 7.504%, 3/1/22 (144A) 209,750 -------------- $ 690,125 -------------- Total Telecommunication Services $ 2,350,445 --------------------------------------------------------------------------------------------------------- UTILITIES -- 2.2% Electric Utilities -- 0.9% 100,000 CCC+/NR Cia de Transporte de Energia Electrica en Alta Tension Transener SA, 9.75%, 8/15/21 (144A) $ 45,000 150,000 BBB+/Baa1 Enel Finance International NV, 5.125%, 10/7/19 (144A) 155,746 200,000 BB+/Baa3 Israel Electric Corp., Ltd., 6.7%, 2/10/17 (144A) 216,000 75,000 6.25 BBB-/Baa2 Southern California Edison Co., Floating Rate Note, 8/1/49 (Perpetual) $ 81,448 200,000 CCC/Caa1 Texas Competitive Electric Holdings Co. LLC, 11.5%, 10/1/20 (144A) 156,500 -------------- $ 654,694 --------------------------------------------------------------------------------------------------------- Gas Utilities -- 0.2% 165,000 NR/Ba2 AmeriGas Finance LLC, 7.0%, 5/20/22 $ 177,788 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 36 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- Independent Power Producers & Energy Traders -- 1.1% 250,000 5.75 BB+/NR East Lane Re, Ltd., Floating Rate Note, 3/14/14 (Cat Bond) (144A) $ 258,100 100,000 NR/B1 Inkia Energy, Ltd., 8.375%, 4/4/21 (144A) 109,000 150,000 BB-/B1 NRG Energy, Inc., 7.625%, 5/15/19 159,000 200,000 BB-/B1 NRG Energy, Inc., 8.25%, 9/1/20 218,000 100,000 BB-/B1 NRG Energy, Inc., 8.5%, 6/15/19 108,000 -------------- $ 852,100 -------------- Total Utilities $ 1,684,582 --------------------------------------------------------------------------------------------------------- TOTAL CORPORATE BONDS (Cost $44,126,732) $ 45,098,199 --------------------------------------------------------------------------------------------------------- FOREIGN GOVERNMENT BONDS -- 0.4% 100,000 B/B3 Provincia de Buenos Aires Argentina, 10.875%, 1/26/21 (144A) $ 72,500 200,000 B+/B2 Ukraine Government International Bond, 9.25%, 7/24/17 (144A) 210,092 -------------- TOTAL FOREIGN GOVERNMENT BONDS (Cost $294,209) $ 282,592 --------------------------------------------------------------------------------------------------------- MUNICIPAL BONDS -- 1.1% Municipal Airport -- 0.2% 150,000 NR/NR City of Charlotte North Carolina, 5.6%, 7/1/27 $ 137,228 --------------------------------------------------------------------------------------------------------- Municipal Development -- 0.1% 100,000 8.50 NR/NR California State Enterprise Development Authority, Floating Rate Note, 4/1/31 $ 115,963 --------------------------------------------------------------------------------------------------------- Municipal General -- 0.3% 100,000 BB+/Ba1 Central Texas Regional Mobility Authority, 6.75%, 1/1/41 $ 115,368 100,000 A+/A1 New Jersey Transportation Trust Fund Authority, 5.5%, 6/15/41 117,116 -------------- $ 232,484 --------------------------------------------------------------------------------------------------------- Municipal Medical -- 0.4% 100,000 AA-/A1 Massachusetts Development Finance Agency, 5.25%, 4/1/37 $ 113,411 150,000 A/NR New Hampshire Health & Education Facilities Authority, 6.5%, 1/1/41 176,142 -------------- $ 289,553 --------------------------------------------------------------------------------------------------------- Municipal Pollution -- 0.1% 100,000 B+/B1 County of York South Carolina, 5.7%, 1/1/24 $ 100,004 -------------- TOTAL MUNICIPAL BONDS (Cost $766,622) $ 875,232 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 37 Schedule of Investments | 9/30/12 (unaudited) (continued) --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- SENIOR FLOATING RATE LOAN INTERESTS -- 20.4%** ENERGY -- 0.6% Oil & Gas Equipment & Services -- 0.1% 88,004 6.25 B/B3 FTS International Services LLC, Term Loan, 5/6/16 $ 84,951 --------------------------------------------------------------------------------------------------------- Integrated Oil & Gas -- 0.1% 78,426 4.50 BBB/Baa2 Glenn Pool Oil & Gas Trust, Term Loan, 6/1/16 $ 78,818 --------------------------------------------------------------------------------------------------------- Oil & Gas Exploration & Production -- 0.4% 265,000 5.00 NR/NR EP Energy LLC, Tranche B-1 Loan, 5/24/18 $ 267,899 -------------- Total Energy $ 431,668 --------------------------------------------------------------------------------------------------------- MATERIALS -- 1.7% Commodity Chemicals -- 0.2% 110,000 0.00 B/B1 CPG International I, Inc., Term Loan, 9/21/19 $ 110,412 49,750 5.25 BB-/B1 Taminco Global Chemical Corp., Tranche B-1 Dollar Term Loan, 2/15/19 50,372 -------------- $ 160,784 --------------------------------------------------------------------------------------------------------- Diversified Chemicals -- 0.3% 134,325 6.50 NR/B1 Ineos Group Holdings, Ltd., Cash Dollar Term Loan, 5/4/18 $ 135,884 99,242 5.00 B+/B2 Univar, Term B Loan, 2/14/17 99,018 -------------- $ 234,902 --------------------------------------------------------------------------------------------------------- Specialty Chemicals -- 0.5% 148,500 5.75 BB-/Ba2 OM Group, Inc., Term B Dollar Loan, 7/5/17 $ 149,521 188,575 5.00 BB-/Ba1 PolyOne Corp., Term Loan, 9/30/17 190,284 -------------- $ 339,805 --------------------------------------------------------------------------------------------------------- Metal & Glass Containers -- 0.3% 221,577 6.75 B/B1 Tank Holdings Corp., Initial Term Loan, 6/8/19 $ 222,131 --------------------------------------------------------------------------------------------------------- Paper Packaging -- 0.1% 98,750 6.50 B/B2 Exopack Holding Corp., Term Loan B, 5/6/17 $ 98,421 --------------------------------------------------------------------------------------------------------- Diversified Metals & Mining -- 0.1% 98,998 4.00 BB+/Ba1 SunCoke Energy, Inc., Tranche B Term Loan, 7/21/18 $ 99,493 --------------------------------------------------------------------------------------------------------- Steel -- 0.2% 149,244 4.75 BB/B1 JMC Steel Group, Term Loan, 2/15/17 $ 150,270 -------------- Total Materials $ 1,305,806 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 38 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- CAPITAL GOODS -- 3.6% Aerospace & Defense -- 0.8% 98,749 8.75 B/B3 API Technologies Corp., Term Loan, 6/1/16 $ 99,490 129,025 5.75 BB+/Ba3 DigitalGlobe, Inc., Term Loan, 9/21/18 129,778 164,586 3.47 BB-/B1 Hunter Defense Technologies, Inc., Term Loan, 8/22/14 145,247 196,426 9.25 CCC/WR IAP Worldwide Services, Inc., Term Loan (First-Lien), 12/20/12 166,471 99,250 6.25 B/NR Sequa Corp., Tranche 1 2011 New Term Loan, 12/3/14 99,994 -------------- $ 640,980 --------------------------------------------------------------------------------------------------------- Electrical Components & Equipment -- 0.5% 249,375 0.00 NR/NR Pelican Products, Inc., Term Loan (First Lien), 8/15/18 $ 248,596 90,188 5.75 B+/B1 Scotsman Industries, Inc., Term Loan, 4/30/16 90,752 50,000 6.00 BB-/Ba2 WireCo WorldGroup, Inc., Term Loan, 4/13/17 50,562 -------------- $ 389,910 --------------------------------------------------------------------------------------------------------- Industrial Conglomerates -- 0.1% 97,808 7.00 B+/B2 Pro Mach, Inc., Term Loan, 7/6/17 $ 97,074 --------------------------------------------------------------------------------------------------------- Construction & Farm Machinery & Heavy Trucks -- 0.9% 200,000 7.00 B+/Ba2 Navistar International Corp., Tranche B Term Loan, 7/31/17 $ 203,250 148,500 5.50 BB/Ba2 Terex Corp., U.S. Term Loan, 4/28/17 149,242 100,000 8.50 BB-/B2 ThyssenKrupp Waupaca, Inc., Term Loan, 6/29/17 101,000 199,500 8.25 BB-/B3 Wastequip, Inc., Term Loan, 5/17/18 198,627 -------------- $ 652,119 --------------------------------------------------------------------------------------------------------- Trading Companies & Distributors -- 1.3% 1,000,000 5.75 BBB-/Ba2 AWAS Aviation Capital, Ltd., Term Loan, 6/25/18 $ 1,007,493 -------------- Total Capital Goods $ 2,787,576 --------------------------------------------------------------------------------------------------------- COMMERCIAL SERVICES & SUPPLIES -- 1.0% Commercial Printing -- 0.2% 198,987 6.62 BB-/Ba3 Cenveo Corp., Term B Facility, 12/15/16 $ 199,485 --------------------------------------------------------------------------------------------------------- Environmental & Facilities Services -- 0.5% 198,500 8.75 NR/WR Aquilex Holdings LLC, Term Loan, 4/1/16 $ 199,244 159,200 5.50 B+/B1 WCA Waste Corp., Term Loan, 3/1/18 160,195 -------------- $ 359,439 --------------------------------------------------------------------------------------------------------- Human Resource & Employment Services -- 0.3% 239,258 0.00 BB-/Ba3 On Assignment, Inc., Initial Term B Loan, 3/20/19 $ 240,005 -------------- Total Commercial Services & Supplies $ 798,929 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 39 Schedule of Investments | 9/30/12 (unaudited) (continued) --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- TRANSPORTATION -- 0.2% Trucking -- 0.2% 110,098 5.00 BB/B1 Swift Transportation Co., Tranche B-2 Term Loan, 12/15/17 $ 110,832 -------------- Total Transportation $ 110,832 --------------------------------------------------------------------------------------------------------- AUTOMOBILES & COMPONENTS -- 0.8% Auto Parts & Equipment -- 0.8% 65,000 0.00 NR/NR Allison Transmission, Inc., Term B3 Loan, 8/23/19 $ 65,285 81,368 3.50 BBB/Baa2 Delphi Automotive LLP, Tranche B Term Loan, 3/31/17 81,765 197,495 7.75 B+/B2 HHI Holdings LLC, Term Loan, 3/9/17 197,495 98,500 5.25 B+/NR Metaldyne Corp., Term Loan, 5/2/17 100,101 129,350 6.75 NR/NR TI Group Automotive Systems LLC, Term Loan, 3/1/19 128,299 64,065 4.25 BB/Ba2 Tomkins LLC, Term B-1 Loan, 9/21/16 64,530 $ 637,475 -------------- Total Automobiles & Components $ 637,475 --------------------------------------------------------------------------------------------------------- CONSUMER DURABLES & APPAREL -- 0.5% Housewares & Specialties -- 0.2% 107,008 5.25 BB-/Ba3 Prestige Brands, Inc., Term B Loan, 12/20/18 $ 108,250 49,750 5.25 B+/B1 Yankee Candle Co., Inc., Initial Term Loan, 3/2/19 50,294 -------------- $ 158,544 --------------------------------------------------------------------------------------------------------- Textiles -- 0.3% 249,375 6.75 NR/Ba3 Kloeckner Pentaplast SA, Term B-1 Loan, 12/14/16 $ 251,557 -------------- Total Consumer Durables & Apparel $ 410,101 --------------------------------------------------------------------------------------------------------- CONSUMER SERVICES -- 1.0% Casinos & Gaming -- 0.1% 96,250 6.00 BB-/Ba3 Boyd Gaming Corp., Increased Term Loan, 12/17/15 $ 97,614 --------------------------------------------------------------------------------------------------------- Hotels, Resorts & Cruise Lines -- 0.3% 250,000 6.25 NR/Ba2 Seven Seas Cruises S de RL LLC, Term B Loan, 12/21/18 $ 251,875 --------------------------------------------------------------------------------------------------------- Restaurants -- 0.5% 124,375 6.50 B+/B1 Landry's, Inc., B Term Loan, 3/22/18 $ 126,272 124,375 5.25 NR/NR NPC International, Inc., Term Loan 2012, 12/28/18 125,930 120,000 0.00 BB-/B1 Wendy's International, Inc., Term Loan, 4/3/19 121,219 -------------- $ 373,421 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 40 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- Specialized Consumer Services -- 0.1% 64,675 5.50 B/Ba3 Ascent Capital Group, Inc., Term Loan, 3/6/18 $ 65,524 -------------- Total Consumer Services $ 788,434 --------------------------------------------------------------------------------------------------------- MEDIA -- 1.4% Advertising -- 0.2% 197,973 5.00 B+/Ba3 Affinion Group, Inc., Tranche B Term Loan, 10/9/16 $ 182,383 --------------------------------------------------------------------------------------------------------- Broadcasting -- 0.6% 269,325 4.25 NR/Ba3 Telesat Canada, U.S. Term B Loan, 3/28/19 $ 270,335 199,863 4.47 B+/B2 Univision Communications, Inc., Extended First-Lien Term Loan, 3/29/17 198,337 -------------- $ 468,672 --------------------------------------------------------------------------------------------------------- Cable & Satellite -- 0.1% 99,750 6.25 B/B1 WideOpenWest LLC, Term Loan, 4/18/18 $ 100,810 --------------------------------------------------------------------------------------------------------- Movies & Entertainment -- 0.3% 198,991 4.50 BB-/Ba2 Live Nation Entertainment, Inc., Term B Loan, 10/20/16 $ 199,818 --------------------------------------------------------------------------------------------------------- Publishing -- 0.2% 120,419 4.50 BB-/Ba3 Interactive Data Corp., Term B Loan, 1/31/18 $ 121,246 -------------- Total Media $ 1,072,929 --------------------------------------------------------------------------------------------------------- RETAILING -- 0.7% Apparel Retail -- 0.3% 249,375 4.75 BB+/Ba2 Ascena Retail Group, Inc., Tranche B Term Loan, 5/17/18 $ 251,661 --------------------------------------------------------------------------------------------------------- Computer & Electronics Retail -- 0.1% 98,750 11.00 B/B2 Targus Group International, Term Loan, 5/12/16 $ 99,244 --------------------------------------------------------------------------------------------------------- Home Improvement Retail -- 0.2% 98,989 5.00 B+/Ba3 Hillman Group, Inc., Term Loan, 5/31/16 $ 99,978 --------------------------------------------------------------------------------------------------------- Automotive Retail -- 0.1% 84,589 6.25 BB/Ba1 Avis Budget Car Rental LLC, Tranche B Term Loan, 6/13/18 $ 85,012 -------------- Total Retailing $ 535,895 --------------------------------------------------------------------------------------------------------- FOOD & STAPLES RETAILING -- 0.3% Food Retail -- 0.3% 248,750 5.75 B+/B1 Roundy's Supermarkets, Inc., Tranche B Term Loan, 1/24/19 $ 244,397 -------------- Total Food & Staples Retailing $ 244,397 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 41 Schedule of Investments | 9/30/12 (unaudited) (continued) --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- FOOD, BEVERAGE & TOBACCO -- 0.6% Packaged Foods & Meats -- 0.6% 250,000 6.50 NR/NR Hearthside Food Solutions LLC, Term Loan A, 5/7/18 $ 250,625 198,736 7.00 B+/B1 Pierre Foods, Inc., Loan (First Lien), 9/30/16 199,875 -------------- $ 450,500 -------------- Total Food, Beverage & Tobacco $ 450,500 --------------------------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 3.0% Health Care Equipment -- 0.6% 175,000 4.50 BBB-/Ba2 Hologic, Inc., Tranche B Term Loan, 4/29/19 $ 177,275 248,623 7.00 BB-/Ba2 Kinetic Concepts, Inc., Dollar Term B-1 Loan, 1/12/18 252,507 -------------- $ 429,782 --------------------------------------------------------------------------------------------------------- Health Care Services -- 1.0% 100,000 0.00 BB-/Ba2 DaVita, Inc., Tranche B2 Term Loan, 8/1/19 $ 100,375 71,802 6.50 B/B1 Gentiva Health Services, Inc., Term B1 Term Loan, 2/22/16 71,533 247,621 6.75 B+/B1 inVentiv Health, Inc., Term B-3 Loan, 6/24/18 240,812 250,000 0.00 NR/Ba3 MModal, Inc., Term B Loan, 7/2/19 247,656 98,997 5.75 B+/Ba3 Rural Metro Corp., Term Loan (First Lien), 3/28/18 99,195 -------------- $ 759,571 --------------------------------------------------------------------------------------------------------- Health Care Facilities -- 1.0% 146,843 6.50 B/B1 Ardent Medical Services, Inc., Term Loan, 9/15/15 $ 147,577 59,550 4.50 BB-/Ba3 Health Management Associates, Inc., Term B Loan, 11/1/18 60,079 197,000 5.00 B/Ba3 IASIS Healthcare LLC, Term B Loan, 4/18/18 197,862 250,000 0.00 NR/NR Kindred Healthcare, Inc., Incremental Term Loan, 6/1/18 246,950 98,750 5.50 BB-/Ba3 Select Medical Holdings Corp., Tranche B Term Loan, 4/25/18 99,429 -------------- $ 751,897 --------------------------------------------------------------------------------------------------------- Managed Health Care -- 0.1% 45,719 8.50 NR/B1 Aveta, Inc., MMM Term Loan, 3/20/17 $ 46,290 45,719 8.50 B+/B1 Aveta, Inc., NAMM Term Loan, 4/4/17 46,119 -------------- $ 92,409 --------------------------------------------------------------------------------------------------------- Health Care Technology -- 0.3% 100,000 0.00 NR/NR Convatec, Inc., Dollar Term Loan, 12/22/16 $ 100,450 149,250 5.00 BB-/Ba3 Emdeon, Inc., Term B-1 Loan, 11/2/18 150,556 -------------- $ 251,006 -------------- Total Health Care Equipment & Services $ 2,284,665 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 42 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 0.7% Biotechnology -- 0.6% 200,000 0.00 BB/B1 Alkermes, Inc., 2019 Term Loan, 9/25/19 $ 201,250 98,496 5.50 BB/B2 Axcan Intermediate Holdings, Inc., Term B-1 Loan, 1/25/17 98,496 123,787 4.50 BB+/Ba2 Grifols, Inc., New U.S. Tranche B Term Loan, 6/4/17 125,056 -------------- $ 424,802 --------------------------------------------------------------------------------------------------------- Pharmaceuticals -- 0.1% 100,000 0.00 NR/B1 Par Pharmaceutical Companies, Inc., Term B Loan, 8/2/19 $ 99,975 -------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 524,777 --------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 0.6% Other Diversified Financial Services -- 0.6% 30,339 5.25 B+/B2 BNY ConvergEx Group LLC, Term Loan First Lien (EZE), 12/16/16 $ 29,353 69,246 5.25 B+/B2 BNY ConvergEx Group LLC, Term Loan First Lien (TOP), 12/16/16 66,995 149,250 7.25 NR/B2 HMH Holdings Delaware, Inc., Term Loan (Exit Facility), 11/21/13 $ 151,489 153,838 7.50 B+/B2 Preferred Sands Holding Co. LLC, Term B Loan, 12/15/16 146,530 98,939 5.25 NR/Ba2 WorldPay, Facility B2A Term Loan, 8/6/17 99,620 -------------- $ 493,987 -------------- Total Diversified Financials $ 493,987 --------------------------------------------------------------------------------------------------------- INSURANCE -- 0.6% Insurance Brokers -- 0.3% 249,357 0.00 B/B1 USI Holdings Corp., Series C New Term Loan, 5/5/14 $ 250,812 --------------------------------------------------------------------------------------------------------- Multi-Line Insurance -- 0.1% 99,750 5.75 B+/Ba2 AmWINS Group, Inc., 1st Lien Term Loan, 5/7/19 $ 100,124 --------------------------------------------------------------------------------------------------------- Life & Health Insurance -- 0.2% 100,000 0.00 NR/Ba3 CNO Financial Group, Inc., Tranche B2 Term Loan, 9/4/18 $ 100,479 -------------- Total Insurance $ 451,415 --------------------------------------------------------------------------------------------------------- SOFTWARE & SERVICES -- 1.8% Data Processing & Outsourced Services -- 0.6% 250,000 4.22 B+/B1 First Data Corp., 2018 Dollar Term Loan, 3/24/18 $ 239,418 175,000 4.25 NR/NR Genpact, Ltd., Term Loan, 8/17/19 175,766 99,000 5.00 BB+/Ba2 NeuStar, Inc., Term Advance Loan, 10/11/18 99,990 -------------- $ 515,174 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 43 Schedule of Investments | 9/30/12 (unaudited) (continued) --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- Application Software -- 1.1% 230,552 7.50 CCC+/B1 Allen Systems Group, Inc., Term B Loan, 11/22/15 $ 221,042 263,675 8.00 B/Ba3 Expert Global Solutions, Inc., Term B Advance (First Lien), 3/13/18 266,092 249,375 0.00 NR/NR Lawson Software, Inc., Tranche B2 Term Loan, 4/5/18 251,137 98,497 5.25 B+/B1 Vertafore, Inc., Term Loan (First Lien), 7/31/16 98,907 -------------- $ 837,178 --------------------------------------------------------------------------------------------------------- Systems Software -- 0.1% 59,700 4.00 NR/Ba2 Rovi Corp., Tranche B2 Term Loan, 3/30/19 $ 57,760 -------------- Total Software & Services $ 1,410,112 --------------------------------------------------------------------------------------------------------- TECHNOLOGY HARDWARE & EQUIPMENT -- 0.5% Electronic Components -- 0.4% 250,000 6.25 B+/B2 Generac Acquisition Corp., Term Loan, 5/22/19 $ 255,312 --------------------------------------------------------------------------------------------------------- Technology Distributors -- 0.1% 99,500 6.50 B/B2 Securus Technologies, Inc., Tranche 2 Term Loan (First Lien), 5/31/17 $ 99,811 -------------- Total Technology Hardware & Equipment $ 355,123 --------------------------------------------------------------------------------------------------------- SEMICONDUCTORS & SEMICONDUCTOR EQUIPMENT -- 0.4% Semiconductor Equipment -- 0.2% 133,728 5.75 BB-/B1 Aeroflex, Inc., Tranche B Term Loan, 4/25/18 $ 133,645 --------------------------------------------------------------------------------------------------------- Semiconductors -- 0.2% 143,340 4.00 BB/Ba2 Microsemi Corp., Term Loan, 2/2/18 $ 144,415 -------------- Total Semiconductors & Semiconductor Equipment $ 278,060 --------------------------------------------------------------------------------------------------------- TELECOMMUNICATION SERVICES -- 0.1% Wireless Telecommunication Services -- 0.1% 49,625 4.00 B+/Ba3 Crown Castle International Corp., Tranche B Term Loan, 1/10/19 $ 49,870 -------------- Total Telecommunication Services $ 49,870 --------------------------------------------------------------------------------------------------------- UTILITIES -- 0.3% Independent Power Producers & Energy Traders -- 0.3% 250,000 0.00 NR/B1 Calpine Corp., Term Loan, 9/27/19 $ 248,750 -------------- Total Utilities $ 248,750 --------------------------------------------------------------------------------------------------------- TOTAL SENIOR FLOATING RATE LOAN INTERESTS (Cost $15,529,722) $ 15,671,301 --------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 44 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------------------------- Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value --------------------------------------------------------------------------------------------------------- TOTAL INVESTMENT IN SECURITIES -- 90.9 % (Cost $68,378,774) (a) $ 69,785,021 --------------------------------------------------------------------------------------------------------- OTHER ASSETS & LIABILITIES -- 9.1% $ 6,940,024 --------------------------------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $ 76,725,045 ========================================================================================================= Notional Unrealized Principal Gain --------------------------------------------------------------------------------------------------------- Swap Counterparty/Referenced Obligation 250,000 Goodyear Tire & Rubber Co., 5.0%, 9/20/17 $ 3,658 --------------------------------------------------------------------------------------------------------- TOTAL CREDIT DEFAULT SWAP AGREEMENTS (Cost $(250,000)) $ 3,658 --------------------------------------------------------------------------------------------------------- NR Not rated by either S&P or Moody's. WR Withdrawn rating. PIK Represents a pay in kind security. REIT Real Estate Investment Trust Step Bond issued with an initial coupon rate which converts to a higher rate at a later date. Perpetual Security with no stated maturity date. Cat Bond Catastrophe Bond. ** 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 certificate of deposit or (iv) other base lending rates used by commercial lenders. The rate shown is the coupon rate at period end. (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 September 30, 2012, the value of these securities amounted to $28,834,834 or 37.6% of total net assets. (a) At September 30, 2012, the net unrealized gain on investments based on cost for federal income tax purposes of $68,383,118 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $ 2,570,365 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (1,168,462) ------------ Net unrealized gain $ 1,401,903 ============ (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. (d) Security is valued using fair value methods (other than prices supplied by independent pricing services). See Notes to Financial Statements -- Note 1A. Principal amounts are denominated in U.S. Dollars unless otherwise noted: EURO Euro GBP British Pound Sterling The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 45 Schedule of Investments | 9/30/12 (unaudited) (continued) Purchases and sales of securities (excluding temporary cash investments) for the six months ended September 30, 2012 aggregated $29,898,540 and $10,824,841, respectively. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. Level 1 - quoted prices in active markets for identical securities Level 2 - other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.) Level 3 - significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) Generally, equity securities are categorized as Level 1, fixed income securities and senior loans as Level 2 and securities valued using fair value methods (other than prices supplied by independent pricing services) as Level 3. See Notes to Financial Statements -- Note 1A. The following is a summary of the inputs used as of September 30, 2012, in valuing the Fund's assets: ---------------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total ---------------------------------------------------------------------------------------- Convertible Corporate Bonds $ -- $ 2,651,913 $ -- $ 2,651,913 Preferred Stocks 688,960 93,553 -- 782,513 Convertible Preferred Stocks 123,800 -- -- 123,800 Asset Backed Securities -- 991,252 -- 991,252 Collateralized Mortgage Obligations -- 3,308,219 -- 3,308,219 Corporate Bonds -- 45,039,429 58,770 45,098,199 Foreign Government Bonds -- 282,592 -- 282,592 Municipal Bonds -- 875,232 -- 875,232 Senior Floating Rate Loan Interests -- 15,671,301 -- 15,671,301 ---------------------------------------------------------------------------------------- Total $ 812,760 $68,913,491 $ 58,770 $69,785,021 ======================================================================================== Other Financial Instruments* $ (75,713) $ 5,233 $ -- $ (70,480) ======================================================================================== * Other financial instruments include futures contracts, forward foreign currency contracts and credit default swaps. Following is a reconciliation of assets using significant unobservable inputs (Level 3): -------------------------------------------------------------------------------- Corporate Bonds -------------------------------------------------------------------------------- Balance as of 3/31/12 $ -- Realized gain (loss)(1) 2,029 Change in unrealized appreciation (depreciation)(2) -- Net purchases (sales) -- Transfers in and out of Level 3** 56,741 -------------------------------------------------------------------------------- Balance as of 9/30/12 $ 58,770 ================================================================================ 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 net unrealized gain (loss) on investments in the Statement of Operations. ** Transfers are calculated on the beginning of period values. The accompanying notes are an integral part of these financial statements. 46 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 Statement of Assets and Liabilities | 9/30/12 (unaudited) ASSETS: Investment in securities (cost $68,378,774) $69,785,021 Cash 8,573,449 Foreign currencies, at value (cost $1,759) 1,765 Futures Collateral 311,150 Receivables -- Investment securities sold 188,670 Fund shares sold 571,600 Dividends and interest 956,958 Due from Pioneer Investment Management, Inc. 12,770 Forward foreign currency portfolio hedge contracts, open-net 1,575 Unrealized appreciation on bridge loan commitments 1,000 Unrealized appreciation on credit default swaps 4,040 Other 16,223 ----------------------------------------------------------------------------------------- Total assets $80,424,221 ----------------------------------------------------------------------------------------- LIABILITIES: Payables -- Investment securities purchased $ 3,360,714 Fund shares repurchased 146,694 Variation margin 1,714 Dividends 117,106 Swap premiums received 9,375 Due to affiliates 20,760 Accrued expenses 42,813 ----------------------------------------------------------------------------------------- Total liabilities $ 3,699,176 ----------------------------------------------------------------------------------------- NET ASSETS: Paid-in capital $75,401,883 Undistributed net investment income 216,905 Accumulated net realized loss on investments and foreign currency transactions and futures contracts (231,461) Net unrealized gain on investments 1,407,247 Net unrealized gain on forward foreign currency contracts and other assets and liabilities denominated in foreign currencies 2,144 Net unrealized gain on credit default swaps 4,040 Net unrealized loss on futures contracts (75,713) ----------------------------------------------------------------------------------------- Total net assets $76,725,045 ========================================================================================= NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Class A (based on $14,142,964/1,432,679 shares) $ 9.87 Class C (based on $5,538,033/562,302 shares) $ 9.85 Class Y (based on $57,044,048/5,759,899 shares) $ 9.90 MAXIMUM OFFERING PRICE: Class A ($9.87 (divided by) 95.50) $ 10.34 ========================================================================================= The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 47 Statement of Operations (unaudited) For the Six Months Ended 9/30/12 INVESTMENT INCOME: Interest $2,087,504 Dividends 30,425 ----------------------------------------------------------------------------------------------- Total investment income $2,117,929 ----------------------------------------------------------------------------------------------- EXPENSES: Management fees $ 220,083 Transfer agent fees and expenses Class A 1,565 Class C 1,081 Class Y 603 Distribution fees Class A 12,366 Class C 23,644 Shareholder communications expense 7,824 Administrative reimbursement 8,935 Custodian fees 12,963 Registration fees 34,201 Professional fees 31,999 Printing expense 6,751 Fees and expenses of nonaffiliated Trustees 3,684 Miscellaneous 8,988 ----------------------------------------------------------------------------------------------- Total expenses $ 374,687 Less fees waived and expenses reimbursed by Pioneer Investment Management, Inc. $ (65,480) ----------------------------------------------------------------------------------------------- Net expenses $ 309,207 ----------------------------------------------------------------------------------------------- Net investment income $1,808,722 ----------------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS, CREDIT DEFAULT SWAPS, FUTURES CONTRACTS, AND FOREIGN CURRENCY TRANSACTIONS: Net realized gain (loss) on: Investments $ 470,980 Credit default swaps 521 Futures contracts (113,821) Forward foreign currency contracts and other assets and liabilities denominated in foreign currencies 8,378 $ 366,058 ----------------------------------------------------------------------------------------------- Change in net unrealized gain (loss) on: Investments $1,240,038 Futures contracts (8,649) Credit default swaps 4,040 Bridge loan commitments 1,000 Forward foreign currency contracts and other assets and liabilities denominated in foreign currencies 35,567 $1,271,996 ----------------------------------------------------------------------------------------------- Net gain on investments, futures contracts, credit default swaps, bridge loan commitments and foreign currency transactions $1,638,054 ----------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $3,446,776 =============================================================================================== The accompanying notes are an integral part of these financial statements. 48 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 Statement of Changes in Net Assets --------------------------------------------------------------------------------------------- Six Months 5/2/11 Ended (Commencement 9/30/12 of Operations) (unaudited) to 3/31/12 --------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income $ 1,808,722 $ 1,700,309 Net realized gain (loss) on investments, credit default swaps, futures contracts and foreign currency transactions 366,058 (492,835) Change in net unrealized gain on investments, futures contracts, credit default swaps, bridge loan commitments and foreign currency transactions 1,271,996 65,722 --------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 3,446,776 $ 1,273,196 --------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Net investment income: Class A ($0.25 and $0.40 per share, respectively) $ (256,270) $ (328,451) Class C ($0.22 and $0.33 per share, respectively) (105,751) (139,118) Class Y ($0.27 and $0.42 per share, respectively) (1,331,411) (1,246,804) --------------------------------------------------------------------------------------------- Total distributions to shareowners $ (1,693,432) $ (1,714,373) --------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sale of shares $ 24,406,086 $ 66,798,132 Reinvestment of distributions 1,046,815 981,904 Cost of shares repurchased (3,952,770) (13,867,289) --------------------------------------------------------------------------------------------- Net increase in net assets resulting from Fund share transactions $ 21,500,131 $ 53,912,747 --------------------------------------------------------------------------------------------- Net increase in net assets $ 23,253,475 $ 53,471,570 NET ASSETS: Beginning of period 53,471,570 -- --------------------------------------------------------------------------------------------- End of period $ 76,725,045 $ 53,471,570 --------------------------------------------------------------------------------------------- Undistributed net investment income $ 216,905 $ (101,615) --------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 49 Statement of Changes in Net Assets (continued) ----------------------------------------------------------------------------------------- 9/30/12 9/30/12 Shares Amount 3/31/12 3/31/12 (unaudited) (unaudited) Shares Amount ----------------------------------------------------------------------------------------- Class A Shares sold 695,043 $ 6,732,541 1,355,973 $13,092,716 Reinvestment of distributions 14,372 139,788 17,960 170,918 Less shares repurchased (41,753) (406,499) (608,916) (5,846,274) ----------------------------------------------------------------------------------------- Net increase 667,662 $ 6,465,830 765,017 $ 7,417,360 -======================================================================================== Class C Shares sold 124,242 $ 1,207,363 481,506 $ 4,750,989 Reinvestment of distributions 3,270 31,643 3,719 35,400 Less shares repurchased (33,667) (320,432) (16,768) (158,596) ----------------------------------------------------------------------------------------- Net increase 93,845 $ 918,574 468,457 $ 4,627,793 ========================================================================================= Class Y Shares sold 1,691,956 $16,466,182 5,056,591 $48,954,427 Reinvestment of distributions 89,989 875,384 81,350 775,586 Less shares repurchased (330,580) (3,225,839) (829,407) (7,862,419) ----------------------------------------------------------------------------------------- Net increase 1,451,365 $14,115,727 4,308,534 $41,867,594 ========================================================================================= The accompanying notes are an integral part of these financial statements. 50 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 Financial Highlights --------------------------------------------------------------------------------------- Six Months 5/2/11 Ended (Commencement 9/30/12 of Operations) (unaudited) 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 $ 0.26 $ 0.39 Net realized and unrealized gain (loss) on investments 0.23 (0.36) --------------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 0.49 $ 0.03 --------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.25) (0.40) --------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.24 $ (0.37) --------------------------------------------------------------------------------------- Net asset value, end of period $ 9.87 $ 9.63 ======================================================================================= Total return* 5.21% 0.38%(b) Ratio of net expenses to average net assets 1.18%** 1.20%** Ratio of net investment income to average net assets 5.54%** 4.87%** Portfolio turnover rate 42%** 19%** Net assets, end of period (in thousands) $14,143 $ 7,365 Ratios with no waiver of fees and assumption of expenses by the Adviser: Net expenses 1.37%** 1.66%** Net investment income 5.35%** 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 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 Absolute Return Credit Fund | Semiannual Report | 9/30/12 51 Financial Highlights (continued) --------------------------------------------------------------------------------------- Six Months 5/2/11 Ended (Commencement 9/30/12 of Operations) (unaudited) 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 $ 0.23 $ 0.34 Net realized and unrealized gain (loss) on investments 0.23 (0.40) --------------------------------------------------------------------------------------- Net increase (decrease) in net assets from investment operations $ 0.46 $ (0.06) --------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.22) (0.33) --------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.24 $ (0.39) --------------------------------------------------------------------------------------- Net asset value, end of period $ 9.85 $ 9.61 ======================================================================================= Total return* 4.83% (0.47)%(b) Ratio of net expenses to average net assets 1.92%** 1.98%** Ratio of net investment income to average net assets 4.86%** 4.07%** Portfolio turnover rate 42%** 19%** Net assets, end of period (in thousands) $5,538 $ 4,501 Ratios with no waiver of fees and assumption of expenses by the Adviser: Net expenses 2.11%** 2.46%** Net investment income 4.67%** 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 each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized. The accompanying notes are an integral part of these financial statements. 52 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------- Six Months 5/2/11 Ended (Commencement 9/30/12 of Operations) (unaudited) 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 $ 0.28 $ 0.42 Net realized and unrealized gain (loss) on investments 0.23 (0.34) --------------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 0.51 $ 0.08 --------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.27) (0.42) --------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.24 $ (0.34) --------------------------------------------------------------------------------------- Net asset value, end of period $ 9.90 $ 9.66 ======================================================================================= Total return* 5.37% 0.95%(b) Ratio of net expenses to average net assets 0.85%** 0.85%** Ratio of net investment income to average net assets 5.88%** 5.48%** Portfolio turnover rate 42%** 19%** Net assets, end of period (in thousands) $57,044 $41,606 Ratios with no waiver of fees and assumption of expenses by the Adviser: Net expenses 1.07%** 1.30%** Net investment income 5.66%** 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 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 Absolute Return Credit Fund | Semiannual Report | 9/30/12 53 Notes to Financial Statements | 9/30/12 (unaudited) 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 three classes of shares designated as Class A, Class C, and Class Y shares. Class A, Class C and Class Y shares were first publicly offered on May 2, 2011. 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: 54 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 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. Money market mutual funds are valued at net asset value. Securities or loans for which independent pricing services are unable to supply prices for which market prices and/or quotations are not readily available or are considered to be unreliable are valued using fair value methods pursuant to procedures adopted by the Board of Trustees. The Fund may use fair value methods if it is determined that a significant event has occurred after the close of the exchange or market on which the security trades and prior to the determination of the Fund's net asset value. Examples of a significant event might include political or economic news, corporate restructurings, natural disasters, terrorist activity or trading halts. Thus, the valuation of the Fund's securities may differ from exchange prices. At September 30, 2012, there was one security that was valued using fair value methods (in addition to securities valued using prices supplied by independent pricing services) representing 0.1% of net assets. Inputs used when applying fair value methods to value a security may include credit ratings, the financial condition of the company, current market conditions and comparable securities. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 55 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 gain or loss 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 gains or losses are recorded 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). 56 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 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 federal income tax provision is required. As of September 30, 2012, the Fund did not have any interest and penalties related to unrecognized 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 remain subject to examination by federal and state tax authorities. The amounts and characterizations of distributions to shareowners for financial reporting purposes are determined in accordance with federal income tax rules. Therefore, the sources of the Fund's distributions may be shown in the accompanying financial statements as from or in excess of net investment income or as from net realized gain on investment transactions, or as from paid-in capital, depending on the type of book/tax differences that may exist. The tax character of current year distributions payable will be determined at the end of the Fund's taxable year. The tax character of distributions paid during the period ended March 31, 2012 was as follows: -------------------------------------------------------------------------------- 2012 -------------------------------------------------------------------------------- Distributions paid from: Ordinary income $1,714,373 -------------------------------------------------------------------------------- Total $1,714,373 ================================================================================ The following shows the components of distributable earnings on a federal income tax basis at March 31, 2012: -------------------------------------------------------------------------------- 2012 -------------------------------------------------------------------------------- Distributable earnings: Undistributed ordinary income $ 172,513 Dividends payable (664,583) Late year loss deferred (99,032) Net unrealized gain 160,920 -------------------------------------------------------------------------------- Total $ (430,182) ================================================================================ The difference between book-basis and tax-basis net unrealized gain is attributable to the tax adjustments relating to catastrophe bonds, the mark-to-market of forward currency and futures contracts, and interest accruals on preferred stock. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 57 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 $666 in underwriting commissions on the sale of Class A shares during the six months ended September 30, 2012. 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. 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. 58 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 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. Subsequent payments for futures contracts ("variation margin") are paid or received by the Fund, depending on the daily fluctuation in the value of the contracts, and are recorded by the Fund as unrealized gains or losses. When the contract is closed, the Fund realizes a gain or loss equal to the difference between the opening and closing value of the contract as well as any fluctuation in foreign currency exchange rates where applicable. Futures contracts are subject to market risk, interest rate risk and currency exchange rate risk. Changes in value of the contracts may not directly correlate to the changes in value of the underlying securities. These risks may decrease the effectiveness of the Fund's hedging strategies and potentially result in a loss. With futures, there is minimal counterparty credit risk to the Fund since futures are exchange-traded and the exchange's clearinghouse, as counterparty to all exchange-traded futures, guarantees the futures against default. The average number of contracts open during the six months ended September 30, 2012 was 204. At September 30, 2012, open futures contracts were as follows: -------------------------------------------------------------------------------------- Number of Contracts Settlement Unrealized Type Long/(Short) Month Value Gain (Loss) -------------------------------------------------------------------------------------- CBOE VIX Future (51) 10/12 $ (836,400) $ 182,100 CBOE VIX Future (25) 11/12 (451,250) 18,157 CBOE VIX Future 36 12/12 691,200 (81,650) CBOE VIX Future (3) 1/13 (62,700) 2,550 CBOE VIX Future 33 2/13 730,950 (133,750) S&P 500 EMINI Future (21) 12/12 (1,505,963) 20,277 U.S. 5 Year Note (CBT) (7) 12/12 (872,430) (4,047) CBOE VIX Future 35 3/13 817,250 (62,950) CBOE VIX Future 17 4/13 416,500 (16,400) -------------------------------------------------------------------------------------- Total $ (75,713) ====================================================================================== Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 59 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. The Fund's investment adviser, Pioneer Investment Management, Inc. (PIM), is responsible for determining that the value of the collateral remains at least equal to the repurchase price. 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. 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. 60 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 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 gain or loss. 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 six months ended September 30, 2012, the Fund opened one credit default swap contract, which was open at the end of the period, 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 six months ended September 30, 2012, 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 six months ended September 30, 2012 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 | Semiannual Report | 9/30/12 61 Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $17,785 in management fees, administrative costs and certain other reimbursements payable to PIM at September 30, 2012. Effective March 5, 2012 PIM has retained Brown Brothers Harriman & Co. to provide certain sub-administration and accounting services to the Fund. 3. Transfer Agent PIMSS, a wholly owned indirect subsidiary of UniCredit, provides substantially all transfer agent and shareowner services to the Fund at negotiated rates. In addition, the Fund reimburses PIMSS for out-of-pocket expenses incurred by PIMSS related to shareholder communications activities such as proxy and statement mailings, outgoing phone calls and omnibus relationship contracts. For the six months ended September 30, 2012, such out-of-pocket expenses by class of shares were as follows: -------------------------------------------------------------------------------- Shareholder Communications: -------------------------------------------------------------------------------- Class A $2,436 Class C 316 Class Y 5,072 -------------------------------------------------------------------------------- Total $7,824 ================================================================================ Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $1,990 in transfer agent fees and out-of-pocket reimbursements payable to PIMSS at September 30, 2012. 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 62 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 distribution services with regard to Class C shares. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $985 in distribution fees payable to PFD at September 30, 2012. In addition, redemptions of each class of shares (except Class Y shares) may be subject to a contingent deferred sales charge (CDSC). A CDSC of 1.00% may be imposed on redemptions of certain net asset value purchases of Class A shares within 12 months of purchase. Redemptions of Class C shares within one year of purchase are subject to a CDSC of 1.00%, based on the lower of cost or market value of shares being redeemed. Shares purchased as part of an exchange remain subject to any CDSC that applied to the original purchase of those shares. There is no CDSC for Class Y shares. Proceeds from the CDSCs are paid to PFD. For the period ended September 30, 2012, CDSCs in the amount of $518 were paid to PFD. 5. Expense Offset Arrangements The Fund has entered into certain expense offset arrangements with PIMSS which may result in a reduction in the Fund's total expenses due to interest earned on cash held by PIMSS. For the six months ended September 30, 2012, the Fund's expenses were not reduced under such arrangements. 6. Forward Foreign Currency Contracts At September 30, 2012, 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 September 30, 2012. The average number of contracts open during the six months ended September 30, 2012 was 986,143. Open portfolio hedges at September 30, 2012 were as follows: ------------------------------------------------------------------------------------------------ Net In Net Contracts Exchange Settlement Unrealized Currency to Deliver For Date Value Gain (Loss) ------------------------------------------------------------------------------------------------ EUR (Euro Dollar) (806,000) $(1,039,881) 10/15/12 $(1,035,963) $ 3,918 GBP (British Pound) (70,000) (110,578) 12/14/12 (112,921) (2,343) ------------------------------------------------------------------------------------------------ $ 1,575 ================================================================================================ Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 63 7. Bridge Loan Commitments As of September 30, 2012, the Fund had no outstanding unfunded loan commitments. The Fund had the following bridge loan commitments outstanding as of September 30, 2012: ---------------------------------------------------------------------------------------------- Net Unrealized Loan Shares Cost Value Gain ---------------------------------------------------------------------------------------------- Hamilton Sundstrand, Bridge Loan 200,000 $200,000 $201,000 $1,000 ---------------------------------------------------------------------------------------------- Total $1,000 ============================================================================================== 8. Additional Disclosures about Derivative Instruments and Hedging Activities: Values of derivative instruments as of September 30, 2012 were as follows: ---------------------------------------------------------------------------------------------------------- Derivatives Not Accounted for as Hedging Instruments Asset Derivatives 2012 Liabilities Derivatives 2012 Under Accounting --------------------------- ---------------------------------- Standards Codification Balance Sheet Balance Sheet (ASC) 815 Location Value Location Value ---------------------------------------------------------------------------------------------------------- Foreign Exchange Contracts* Receivables $1,575 Payables $ -- Futures Contracts** Receivables -- Payables 75,713 ---------------------------------------------------------------------------------------------------------- Total $1,575 $ 75,713 ========================================================================================================== * Foreign exchange contracts are shown as a net payable 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 six months ended September 30, 2012 was as follows: 64 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Derivatives Not Change in Accounted for as Realized Gain Unrealized Hedging Instruments (Loss) on Gain or (Loss) 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 ------------------------------------------------------------------------------------------------------ Foreign Exchange Contracts Net realized gain on forward foreign $ 9,414 currency contracts and other assets and liabilities denominated in foreign currencies Foreign Exchange Contracts Change in unrealized gain (loss) on forward $ 34,053 foreign currency contracts and other assets and liabilities denominated in foreign currencies Futures Contracts Net realized loss on futures contracts $(113,831) Futures Contracts Change in unrealized loss on futures $ (8,649) contracts Credit Default Swaps Net realized gain on credit default swaps $ 521 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 until January 20, 2012 was in the amount of $165 million. Under such facility, interest on borrowings was payable at the higher of the London Interbank Offered Rate (LIBOR) on the borrowing date plus 1.25% on an annualized basis or the Federal Funds Rate on the borrowing date plus 1.25% on an annualized basis. The credit facility in effect as of February 15, 2012 is in the amount of $215 million. Under such facility, depending on the type of loan, interest on borrowings is payable at LIBOR plus 0.90% on an annualized basis, or the Alternate Base Rate, which is the greater of (a) the facility's administrative agent's daily announced prime rate on the borrowing date, (b) 2% plus the Federal Funds Rate on the borrowing date and (c) 2% plus the overnight Euro dollar rate on the borrowing date. The Funds pay an annual commitment fee to participate in a credit facility. The commitment fee is allocated among participating Funds based on an allocation schedule set forth in the credit agreement. For the six months ended September 30, 2012, the Fund had no borrowings under a credit facility. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 65 Trustees, Officers and Service Providers Trustees Officers Thomas J. Perna, Chairman John F. Cogan, Jr., President* David R. Bock Daniel K. Kingsbury, Executive John F. Cogan, Jr. Vice President Benjamin M. Friedman Mark E. Bradley, Treasurer** Margaret B.W. Graham Christopher J. Kelley, Secretary Daniel K. Kingsbury Marguerite A. Piret Stephen K. West Investment Adviser and Administrator Pioneer Investment Management, Inc. Custodian and Sub-Administrator Brown Brothers Harriman & Co. Principal Underwriter Pioneer Funds Distributor, Inc. Legal Counsel Bingham McCutchen LLP Shareowner Services and Transfer Agent Pioneer Investment Management Shareholder Services, Inc. Proxy Voting Policies and Procedures of the Fund are available without charge, upon request, by calling our toll free number (1-800-225-6292). Information regarding how the Fund voted proxies relating to portfolio securities during the most recent 12-month period ended June 30 is publicly available to shareowners at us.pioneerinvestments.com. This information is also available on the Securities and Exchange Commission's web site at http://www.sec.gov. * Chief Executive Officer of the Fund ** Chief Financial and Accounting Officer of the Fund 66 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 This page for your notes. Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 67 This page for your notes. 68 Pioneer Absolute Return Credit Fund | Semiannual Report | 9/30/12 How to Contact Pioneer We are pleased to offer a variety of convenient ways for you to contact us for assistance or information. Call us for: -------------------------------------------------------------------------------- Account Information, including existing accounts, new accounts, prospectuses, applications and service forms 1-800-225-6292 FactFone(SM) for automated fund yields, prices, account information and transactions 1-800-225-4321 Retirement plans information 1-800-622-0176 Write to us: -------------------------------------------------------------------------------- PIMSS, Inc. P.O. Box 55014 Boston, Massachusetts 02205-5014 Our toll-free fax 1-800-225-4240 Our internet e-mail address ask.pioneer@pioneerinvestments.com (for general questions about Pioneer only) Visit our web site: us.pioneerinvestments.com This report must be preceded or accompanied by a prospectus. The Fund files a complete schedule of investments with the Securities and Exchange Commission for the first and third quarters for each fiscal year on Form N-Q. Shareholders may view the filed Form N-Q by visiting the Commission's web site at www.sec.gov. The filed form may also be viewed and copied at the Commission's Public Reference Room in Washington, DC. Information regarding the operations of the Public Reference Room may be obtained by calling 1-800-SEC-0330. [LOGO] PIONEER Investments(R) Pioneer Investment Management, Inc. 60 State Street Boston, MA 02109 us.pioneerinvestments.com Securities offered through Pioneer Funds Distributor, Inc. 60 State Street, Boston, MA 02109 Underwriter of Pioneer Mutual Funds, Member SIPC (c) 2012 Pioneer Investments 25266-01-1112 Pioneer Multi-Asset Ultrashort Income Fund (Formerly known as Pioneer Multi-Asset Floating Rate Fund)* -------------------------------------------------------------------------------- Semiannual Report | September 30, 2012 -------------------------------------------------------------------------------- Ticker Symbols: Class A MAFRX Class C MCFRX Class Y MYFRX *Effective June 30, 2012, Pioneer Multi-Asset Floating Rate Fund was renamed Pioneer Multi-Asset Ultrashort Income Fund. [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 66 Notes to Financial Statements 73 Trustees, Officers and Service Providers 82 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 1 President's Letter Dear Shareowner, The U.S. stock market rallied sharply through the third quarter of 2012 amid a sluggish, but nonetheless growing, U.S. economy. We have been cautiously optimistic about the U.S. from the start of the year, and the economic data continue to be encouraging. The housing and auto sectors are benefitting from record-low interest rates. The climate for consumer and business credit has improved, and inflation appears to be subdued. While corporate profits slowed in the third quarter, many U.S. companies continue to have strong balance sheets and to pay attractive dividends* compared to fixed-income securities. All of these factors contributed to gains for investors who owned riskier assets, including equities and higher-yielding corporate bonds. Year to date through September 30, 2012, the Standard & Poor's 500 Index returned 16.35%. In fixed income, the Bank of America Merrill Lynch High Yield Master II Index was up by 12.02% during the same period, while the Barclays Capital Aggregate Bond Index gained 3.99%. Treasury bonds, by contrast, generated a comparatively sluggish return of 1.70%, as measured by the Barclays Capital Intermediate Treasuries Index. Despite this generally positive picture during the first nine months of 2012, investors face powerful macroeconomic challenges in the months ahead. These include the threat of a so-called "fiscal cliff" in the U.S. budget process after the November elections, the European sovereign-debt crisis, and slowing growth in both Europe and China. Investors can continue to count on market volatility tied to these factors, although we remain optimistic that the underlying economic trends are moving in the right direction. At Pioneer, we have long advocated the benefits of staying diversified** and investing for the long term. And while diversification alone does not assure a profit or protect against loss in a declining market, we believe in actively seeking out opportunities in undervalued securities and sectors around the globe. Our advice, as always, is to work closely with a trusted financial advisor to discuss your goals and work together to develop an investment strategy that meets your individual needs. There is no single best strategy that works for every investor. * Dividends are not guaranteed. ** Diversification does not assure a profit or protect against loss in a declining market. 2 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 Pioneer's investment professionals focus on finding good opportunities in both equity and bond markets using the same disciplined investment approach we have used since 1928. Our strategy is to identify undervalued individual securities with the greatest potential for success, carefully weighing risk against reward. Our teams of investment professionals continually monitor and analyze the relative valuations of different sectors and securities globally to help build portfolios that we believe can help you achieve your investment goals. We invite you to learn more about Pioneer and our time-tested approach to investing by consulting with your financial advisor or visiting us online at us.pioneerinvestments.com. We greatly appreciate your trust in us, and we thank you for investing with Pioneer. Sincerely, /s/ Daniel K. Kingsbury Daniel K. Kingsbury President and CEO Pioneer Investment Management USA, Inc. Any information in this shareowner report regarding market or economic trends or the factors influencing the Fund's historical or future performance are statements of opinion as of the date of this report. These statements should not be relied upon for any other purposes. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 3 Portfolio Management Discussion | 9/30/12 In the following interview, portfolio managers Charles Melchreit, Seth Roman and Jonathan Sharkey discuss the market environment and the factors that influenced the performance of Pioneer Multi-Asset Ultrashort Income Fund during the six-month period ended September 30, 2012. Mr. Melchreit, vice president and portfolio manager at Pioneer, Mr. Roman, vice president and portfolio manager at Pioneer, and Mr. Sharkey, vice president and portfolio manager at Pioneer, are responsible for the day-to-day management of the Fund*. Q How would you describe the market environment for fixed-income investors during the six-month period ended September 30, 2012? A For most of the period, credit-sensitive sectors continued to benefit from the policies of the Federal Reserve (the Fed), which in effect forced investors seeking any kind of reasonable return to assume a degree of risk. Early in the period, this flight-to-credit trend was somewhat mitigated by headlines coming out of Europe that called into question the future of the euro. 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 indicators deteriorated and consensus growth estimates were lowered. As the period progressed, however, markets began to focus more on some encouraging developments in the United States. U.S. housing data increasingly confirmed that prices had bottomed out and even were beginning to rise. In addition, with employment data continuing to disappoint, markets anticipated that the Fed would announce further bond purchases through a third round of quantitative easing ("QE3"). In September 2012, the Fed met this expectation and at the same time extended its commitment to keeping short-term interest rates at extraordinarily low levels 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 the credit-sensitive sectors. Interest rates began the period at extraordinarily low levels and finished even lower. For the full period between April 1, 2012, and September 30, 2012, interest rates fell along the length of the Treasury yield curve. Specifically, the two-year Treasury yield declined from 0.33% to 0.23%, the * Effective June 30, 2012, Pioneer Multi-Asset Floating Rate Fund was renamed Pioneer Multi-Asset Ultrashort Income Fund. 4 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 five-year yield declined from 1.04% to 0.62%, the 10-year yield declined from 2.23% to 1.65%, and the 30-year yield declined from 3.35% to 2.82%. Most credit spreads narrowed during the period as investors continued to seek alternatives to the very low yields available in Treasuries. (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 with developments in the European debt crisis, it remained at very low levels throughout the period. Q How did the Fund perform in that environment? A Pioneer Multi-Asset Ultrashort Income Fund Class A shares returned 1.47% at net asset value during the six-month period ended September 30, 2012, while the Fund's benchmark, the Bank of America Merrill Lynch (BofA ML) U.S. Dollar 3-Month LIBOR Index, returned 0.25%. During the same period, the average return of the 90 mutual funds in Lipper's Ultra-Short Obligations Funds category was 0.82%. Q How did you manage the Fund in the prevailing environment during the six-month period ended September 30, 2012? A During the six-month period, we continued to maintain a portfolio that was designed to provide higher levels of income than cash or money market accounts by taking on more risk, while providing protection of investors' principal against 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. During the period, well over 80% of the Fund's portfolio was held in floating-rate issues with interest rates tied to LIBOR, or fixed-rate issues with less than one year remaining to maturity. Unlike many other floating-rate vehicles, the Fund's strategy is primarily focused on the investment-grade asset classes. At the same time, we do seek to have the Fund benefit from credit spreads. In doing so, we seek at all times to maintain diversified* portfolio exposure to a range of spread sectors. The principal spread sectors represented in the Fund during the period included asset-backed securities (ABS), mortgage-backed securities (MBS) -- both agency and non-agency -- and investment-grade corporate bonds. In making purchases for the Fund, we seek to benefit from what we believe to be attractive income opportunities, while minimizing portfolio exposure to price volatility by emphasizing securities with shorter remaining maturities. * Diversification does not assure a profit or protect against loss in a declining market. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 5 Q How did the Fund's positioning affect its benchmark-relative performance during the six-month period ended September 30, 2012? A The Fund's credit exposures worked out well during the six-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 MBS/ABS holdings combined with price strengthening as credit spreads narrowed during the six-month period. In commercial MBS, we trimmed the portfolio's exposure to fixed-rate securities in favor of floating-rate pools, in order to protect against a rise in prepayment rates. Within ABS, we increased the Fund's exposure to home equity loans, where we have seen reasonable values and the potential to benefit from a firming in the U.S. housing market. Benchmark-relative performance during the period also was helped by the portfolio's significant holdings of investment-grade corporates. While we do focus on the investment-grade sectors, we also will include representation in the portfolio from below-investment-grade asset categories, where we believe the incremental income provides an attractive trade off between risk and reward. In that vein, the Fund held a modest position in leveraged bank loans, which also benefited from the positive investor sentiment about the credit sectors during the period. In addition, the Fund's more than 4% exposure to event-linked, or "catastrophe" bonds, provided a boost to performance during the six-month period. As always, we are mindful that many investors view the Fund as a source of liquidity in their portfolios. As such, we have maintained significant liquidity in the portfolio to allow us to meet any shareholder redemption requests without forced selling. With Treasury yields at such unattractive levels, we find that some money market instruments, such as municipal variable rate demand notes and repurchase agreements, provide the Fund with the requisite liquidity as well as income. As the period progressed, we shifted the liquid portion of the portfolio toward repurchase agreements. Q What is your assessment of the current investment climate for the Fund? A U.S. Treasury securities continue to appear unattractive to us in relation to the spread sectors, given real yields, or yields after accounting for inflation, that are significantly in negative territory. At the same time, we continue to expect modest economic growth that should be sufficient to support credit-sector fundamentals, especially given the strength of corporate balance sheets. Given this backdrop, we expect to maintain a portfolio tilt toward the spread sectors. Given recent price appreciation and spread narrowing across the credit sectors, however, we have been focusing strongly on individual security selection. The process of identifying what 6 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 we believe to be high-quality securities that are trading at attractive valuations is especially labor intensive in light of recent price strength. We constantly strive to not assume any risk for which the Fund is not adequately compensated. We continue to expect that the European sovereign-debt and banking issues will take some time to resolve. In all investment environments, we will continue to seek to provide the Fund's shareholders with higher levels of income than cash vehicles as well as protection against any future rise in market interest rates. Of course, while we always strive to achieve these goals, investing in the Fund is associated with certain risks, and positive outcomes are never a certainty. Please refer to the Schedule of Investments on pages 17-65 for a full listing of Fund securities. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 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 commodities. The value of commodity-linked derivatives may be affected by changes in overall market movements, commodity index volatility, changes in interest rates, factors affecting a particular industry or commodity, international economic, political and regulatory developments, supply and demand, and governmental regulatory policies. 8 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 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. 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. 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 | Semiannual Report | 9/30/12 9 Portfolio Summary | 9/30/12 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 29.1% U.S. Corporate Bonds 12.9% U.S. Government Securities 8.2% Senior Secured Loans 7.5% International Corporate Bonds 7.3% Municipal Bonds 2.0% Temporary Cash Investments 1.7% 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 39.7% AA 16.8% A 11.9% BBB 8.5% BB 9.8% B 2.4% Not Rated 2.1% Cash and equivalents 8.8% 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 Home Loan Banks, Floating Rate Note, 7/22/13 0.89% --------------------------------------------------------------------------------------------------- 2. Federal National Mortgage Association, Floating Rate Note, 11/23/12 0.85 --------------------------------------------------------------------------------------------------- 3. Structured Asset Securities Corp., Floating Rate Note, 7/25/36 (144A) 0.73 --------------------------------------------------------------------------------------------------- 4. Federal National Mortgage Association, Floating Rate Note, 12/3/12 0.72 --------------------------------------------------------------------------------------------------- 5. Mississippi Business Finance Corp., Floating Rate Note, 12/1/30 0.70 --------------------------------------------------------------------------------------------------- 6. Federal Home Loan Mortgage Corp., Floating Rate Note, 11/18/13 0.69 --------------------------------------------------------------------------------------------------- 7. Harris County Health Facilities Development Corp., Floating Rate Note, 12/1/41 0.64 --------------------------------------------------------------------------------------------------- 8. Banc of America Large Loan Trust 2007-BMB1, Floating Rate Note, 8/15/29 (144A) 0.64 --------------------------------------------------------------------------------------------------- 9. Fannie Mae REMICS, Floating Rate Note, 5/25/40 0.64 --------------------------------------------------------------------------------------------------- 10. Mastr Asset Backed Securities Trust, Floating Rate Note, 2/25/36 0.63 --------------------------------------------------------------------------------------------------- * 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 | Semiannual Report | 9/30/12 Prices and Distributions | 9/30/12 Net Asset Value per Share -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 9/30/12 3/31/12 -------------------------------------------------------------------------------- A $10.09 $10.02 -------------------------------------------------------------------------------- C $10.08 $10.02 -------------------------------------------------------------------------------- Y $10.10 $10.03 -------------------------------------------------------------------------------- Distributions per Share: 4/1/12-9/30/12 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains -------------------------------------------------------------------------------- A $0.0767 $ -- $ -- -------------------------------------------------------------------------------- C $0.0488 $ -- $ -- -------------------------------------------------------------------------------- Y $0.0873 $ -- $ -- -------------------------------------------------------------------------------- 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. 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 Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 11 Performance Update | 9/30/12 Class A Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer 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 September 30, 2012) -------------------------------------------------------------------------------- Net Asset Public Offering Period Value (NAV) Price (POP) -------------------------------------------------------------------------------- Life-of-Class -------------------------------------------------------------------------------- (5/2/11) 2.08% 0.26% -------------------------------------------------------------------------------- 1 Year 2.88 0.26 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated June 30, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 1.03% 0.85% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment BofA Merrill Lynch U.S. Pioneer Multi-Asset Dollar 3-Month LIBOR Index Ultrashort Income Fund 4/30/2011 $ 9,750 $ 10,000 9/30/2011 $ 9,756 $ 10,009 9/30/2012 $ 10,037 $ 10,058 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 | Semiannual Report | 9/30/12 Performance Update | 9/30/12 Class C Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer 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 September 30, 2012) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class -------------------------------------------------------------------------------- (5/2/11) 1.34% 1.34% -------------------------------------------------------------------------------- 1 Year 2.17 2.17 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated June 30, 2012) -------------------------------------------------------------------------------- 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 9/30/2011 $ 9,975 $ 10,009 9/30/2012 $ 10,191 $ 10,058 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 | Semiannual Report | 9/30/12 13 Performance Update | 9/30/12 Class Y Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 million investment made in Pioneer 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 September 30, 2012) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class -------------------------------------------------------------------------------- (5/2/11) 2.38% 2.38% -------------------------------------------------------------------------------- 1 Year 3.21 3.21 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated June 30, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 0.80% 0.65% -------------------------------------------------------------------------------- [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 $ 5,000,000 $ 5,000,000 9/30/2011 $ 5,008,825 $ 5,004,742 9/30/2012 $ 5,169,696 $ 5,028,849 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. 14 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 Comparing Ongoing Fund Expenses As a shareowner in the Fund, you incur two types of costs: (1) ongoing costs, including management fees, distribution and/or service (12b-1) fees, and other Fund expenses; and (2) transaction costs, including sales charges (loads) on purchase payments. This example is intended to help you understand your ongoing expenses (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. The example is based on an investment of $1,000 at the beginning of the Fund's latest six-month period and held throughout the six months. Using the Tables -------------------------------------------------------------------------------- Actual Expenses The first table below provides information about actual account values and actual expenses. You may use the information in this table, together with the amount you invested, to estimate the expenses that you paid over the period as follows: (1) Divide your account value by $1,000 Example: an $8,600 account value (divided by) $1,000 = 8.6 (2) Multiply the result in (1) above by the corresponding share class's number in the third row under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. Expenses Paid on a $1,000 Investment in Pioneer Multi-Asset Ultrashort Income Fund Based on actual returns from April 1, 2012, through September 30, 2012. -------------------------------------------------------------------------------- Share Class A C Y -------------------------------------------------------------------------------- Beginning Account Value on 4/1/12 $1,000.00 $1,000.00 $1,000.00 -------------------------------------------------------------------------------- Ending Account Value (after expenses) on 9/30/12 $1,014.70 $1,010.90 $1,015.80 -------------------------------------------------------------------------------- Expenses Paid During Period* $3.28 $5.24 $2.27 -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 0.65%, 1.04% and 0.45% for Class A, Class C, and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 183/366 (to reflect the one-half year period). Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 15 Hypothetical Example for Comparison Purposes The table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the tables are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as sales charges (loads) that are charged at the time of the transaction. Therefore, the table below is useful in comparing ongoing costs only and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher. Expenses Paid on a $1,000 Investment in Pioneer Multi-Asset Ultrashort Income Fund Based on a hypothetical 5% return per year before expenses, reflecting the period from April 1, 2012, through September 30, 2012. -------------------------------------------------------------------------------- Share Class A C Y -------------------------------------------------------------------------------- Beginning Account Value on 4/1/12 $1,000.00 $1,000.00 $1,000.00 -------------------------------------------------------------------------------- Ending Account Value (after expenses) on 9/30/12 $1,021.81 $1,019.85 $1,022.81 -------------------------------------------------------------------------------- Expenses Paid During Period* $3.29 $5.27 $2.28 -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 0.65%, 1.04% and 0.45% for Class A, Class C, and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 183/366 (to reflect the one-half year period). 16 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 Schedule of Investments | 9/30/12 (unaudited) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ ASSET BACKED SECURITIES -- 26.3% MATERIALS -- 3.6% Diversified Chemicals -- 0.4% 3,000,000 0.62 AAA/NR BMW Floorplan Master Owner Trust, Floating Rate Note, 9/15/17 (144A) $ 3,000,725 ------------------------------------------------------------------------------------------------------ Precious Metals & Minerals -- 0.0%+ 117,805 1.12 AA-/B2 Credit-Based Asset Servicing and Securitization LLC, Floating Rate Note, 11/25/33 $ 103,774 ------------------------------------------------------------------------------------------------------ Steel -- 1.8% 667,784 0.70 BBB+/Aa2 ABFC 2005-HE2 Trust, Floating Rate Note, 6/25/35 $ 662,201 1,043,822 0.53 AAA/Aa3 ABFC 2005-WF1 Trust, Floating Rate Note, 12/25/34 990,642 72,911 1.57 AA/Ba3 CDC Mortgage Capital Trust, Floating Rate Note, 8/25/33 63,480 113,091 0.49 AA+/A1 Citigroup Mortgage Loan Trust 2006-HE1, Floating Rate Note, 1/25/36 110,226 300,000 0.62 AAA/Aa2 First NLC Trust 2005-2, Floating Rate Note, 9/25/35 286,833 358,721 0.48 AAA/Aaa HSBC Home Equity Loan Trust 2005-3, Floating Rate Note, 1/20/35 346,156 100,000 1.37 AAA/Aaa HSBC Home Equity Loan Trust USA 2007-3, Floating Rate Note, 11/20/36 95,190 2,462,866 1.42 AAA/Aa2 HSBC Home Equity Loan Trust USA 2007-3, Floating Rate Note, 11/20/36 2,422,310 335,431 0.95 AA/Aa1 IXIS Real Estate Capital Trust 2005-HE1, Floating Rate Note, 6/25/35 333,438 90,397 0.56 BB/A2 IXIS Real Estate Capital Trust 2005-HE4, Floating Rate Note, 2/25/36 84,025 1,159,415 0.95 AA-/Aa1 Merrill Lynch Mortgage Synthetic, Floating Rate Note, 6/28/35 (144A) 1,140,679 142,482 0.74 A-/Baa3 MSDWCC Heloc Trust, Floating Rate Note, 4/25/16 137,147 167,278 0.32 BBB-/A2 Nationstar Home Equity Loan Trust, Floating Rate Note, 3/25/37 166,931 961,723 0.48 NR/Aaa New Century Home Equity Loan Trust Series 2005-2, Floating Rate Note, 6/25/35 956,366 53,291 0.52 AAA/Aa1 New Century Home Equity Loan Trust Series 2005-2, Floating Rate Note, 6/25/35 52,607 13,422 0.33 BB/A2 Soundview Home Loan Trust 2006-EQ1, Floating Rate Note, 10/25/36 13,399 941,153 0.34 BB-/A1 Soundview Home Loan Trust 2007-NS1, Floating Rate Note, 1/25/37 937,915 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 17 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Steel -- (continued) 1,138,089 0.42 A/Ba1 Specialty Underwriting & Residential Finance, Floating Rate Note, 12/25/36 $ 1,104,121 970,822 0.61 AAA/A3 Specialty Underwriting & Residential Finance, Floating Rate Note, 6/25/36 945,803 30,619 0.47 A/Baa3 Specialty Underwriting & Residential Finance, Floating Rate Note, 9/25/36 30,486 1,392,182 0.62 AAA/Aaa Truman Capital Mortgage Loan Trust, Floating Rate Note, 12/25/32 (144A) 1,394,319 ------------- $ 12,274,274 ------------------------------------------------------------------------------------------------------ Paper Products -- 1.4% 2,000,000 1.52 AAA/Aaa Chase Issuance Trust, Floating Rate Note, 8/15/15 $ 2,023,158 600,000 0.82 AAA/Aaa Gracechurch Card Funding Plc, Floating Rate Note, 11/15/14 (144A) 600,024 1,000,000 0.77 AAA/Aaa Gracechurch Card Funding Plc, Floating Rate Note, 4/15/15 (144A) 1,000,040 1,000,000 1.07 AAA/Aaa Gracechurch Card Funding Plc, Floating Rate Note, 5/15/19 (144A) 996,740 1,000,000 0.92 AAA/Aaa Gracechurch Card Funding Plc, Floating Rate Note, 6/15/17 (144A) 1,007,076 600,000 0.97 AAA/Aaa Penarth Master Issuer Plc, Floating Rate Note, 11/18/15 (144A) 599,838 2,700,000 0.97 AAA/Aaa Penarth Master Issuer Plc, Floating Rate Note, 12/18/14 (144A) 2,702,126 700,000 0.87 AAA/Aaa Penarth Master Issuer Plc, Floating Rate Note, 5/18/15 (144A) 699,459 73,750 AAA/NR World Financial Network Credit Card Master Trust II, 4.16%, 9/15/17 (144A) 73,869 ------------- $ 9,702,330 ------------- Total Materials $ 25,081,103 ------------------------------------------------------------------------------------------------------ CAPITAL GOODS -- 0.0%+ Construction & Farm Machinery & Heavy Trucks -- 0.0%+ 9,559 NR/Aaa John Deere Owner Trust, 1.32%, 5/15/14 $ 9,575 ------------- Total Capital Goods $ 9,575 ------------------------------------------------------------------------------------------------------ COMMERCIAL SERVICES & SUPPLIES -- 0.1% Research & Consulting Services -- 0.1% 447,917 0.41 BBB/Baa2 TAL Advantage LLC, Floating Rate Note, 4/20/21 (144A) $ 438,565 ------------- Total Commercial Services & Supplies $ 438,565 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 18 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ AUTOMOBILES & COMPONENTS -- 0.8% Automobile Manufacturers -- 0.8% 38,925 AA+/Aaa AmeriCredit Automobile Receivables Trust 2009-1, 9.79%, 4/15/14 $ 40,108 60,880 AAA/Aaa AmeriCredit Automobile Receivables Trust 2011-1, 0.84%, 6/9/14 60,889 2,779,000 1.22 AA/NR Hyundai Capital Auto Funding, Ltd., Floating Rate Note, 9/20/16 (144A) 2,764,549 104,125 A/NR Santander Drive Auto Receivables Trust 2011-S1, 1.89%, 5/15/17 (144A) 104,546 170,337 AA/NR Santander Drive Auto Receivables Trust 2011-S2, 2.06%, 6/15/17 (144A) 171,106 161,403 A/NR Santander Drive Auto Receivables Trust 2011-S2, 2.86%, 6/15/17 (144A) 162,405 47,694 BBB/NR Santander Drive Auto Receivables Trust 2011-S2, 3.35%, 6/15/17 (144A) 47,962 168,059 AAA/Aaa Santander Drive Auto Receivables Trust 2012-1, 1.25%, 4/15/15 168,835 803,929 NR/NR Santander Drive Auto Receivables Trust 2012-5, 0.336%, 8/15/13 803,982 1,000,000 AAA/Aaa Santander Drive Auto Receivables Trust 2012-5, 0.57%, 12/15/15 1,001,544 ------------- $ 5,325,926 ------------- Total Automobiles & Components $ 5,325,926 ------------------------------------------------------------------------------------------------------ CONSUMER SERVICES -- 0.2% Hotels, Resorts & Cruise Lines -- 0.2% 164,449 BBB+/Baa2 Marriott Vacation Club Owner Trust 2005-2, 6.205%, 10/20/27 (144A) $ 163,954 207,474 AAA/Aaa Marriott Vacation Club Owner Trust 2006-2, 5.362%, 10/20/28 (144A) 208,700 60,493 AA/Aa2 Marriott Vacation Club Owner Trust 2006-2, 5.442%, 10/20/28 (144A) 60,701 161,018 A/A2 Marriott Vacation Club Owner Trust 2006-2, 5.691%, 10/20/28 (144A) 161,294 1,000,000 A/NR Westgate Resorts LLC, 3.0%, 1/20/25 (144A) 1,001,250 ------------- $ 1,595,899 ------------- Total Consumer Services $ 1,595,899 ------------------------------------------------------------------------------------------------------ RETAILING -- 0.2% Automotive Retail -- 0.2% 58,861 AAA/NR CarMax Auto Owner Trust, 1.74%, 4/15/14 $ 58,953 155,854 AAA/Aaa CarMax Auto Owner Trust, 5.81%, 12/16/13 157,034 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 19 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Automotive Retail -- (continued) 1,004,071 AAA/Aaa Ford Credit Auto Owner Trust, 2.98%, 8/15/14 $ 1,013,672 ------------- $ 1,229,659 ------------- Total Retailing $ 1,229,659 ------------------------------------------------------------------------------------------------------ BANKS -- 12.3% Diversified Banks -- 0.1% 235,548 0.75 AA/Aaa Keycorp Student Loan Trust, Floating Rate Note, 10/28/41 $ 221,885 298,922 0.31 NR/Aa1 Wells Fargo Home Equity Trust, Floating Rate Note, 4/25/37 292,149 ------------- $ 514,034 ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- 12.2% 1,685,763 2.02 BBB+/Ba3 ACE Securities Corp., Floating Rate Note, 10/25/32 $ 1,631,737 581,001 0.40 BB+/B3 ACE Securities Corp., Floating Rate Note, 3/25/36 549,613 468,350 6.50 BB+/Baa2 ACE Securities Corp., Floating Rate Note, 8/15/30 (144A) 473,307 705,000 AAA/NR AH Mortgage Advance Co., Ltd., 2.98%, 3/13/43 (144A) 709,616 500,000 AAA/NR AH Mortgage Servicer Advance Revolving Trust 1, 2.23%, 5/10/43 (144A) 501,900 1,169,884 AAA/NR Ally Auto Receivables Trust 2010-5, 1.11%, 1/15/15 1,174,349 173,157 0.52 AAA/Aa1 Ameriquest Mortgage Securities, Inc., Floating Rate Note, 11/25/34 165,232 342,807 0.44 AAA/A2 Ameriquest Mortgage Securities, Inc., Floating Rate Note, 12/25/35 333,201 126,510 0.42 AAA/Aaa Ameriquest Mortgage Securities, Inc., Floating Rate Note, 8/25/35 122,565 416,728 0.77 AAA/NR ARI Fleet Lease Trust 2010-A, Floating Rate Note, 3/15/20 (144A) 416,728 86,912 AAA/A3 Bayview Financial Acquisition Trust, 6.205%, 5/28/37 (Step) 87,988 2,834,219 0.89 AAA/Aa1 Bayview Financial Acquisition Trust, Floating Rate Note, 2/28/44 2,765,523 917,482 0.49 AAA/A1 Bayview Financial Acquisition Trust, Floating Rate Note, 4/28/36 870,665 89,751 0.85 AAA/Aaa Bayview Financial Acquisition Trust, Floating Rate Note, 5/28/44 87,547 1,284,967 0.63 AAA/Aa1 Bayview Financial Acquisition Trust, Floating Rate Note, 6/28/44 1,241,514 607,587 0.80 AAA/Aaa Bayview Financial Acquisition Trust, Floating Rate Note, 8/28/44 590,168 The accompanying notes are an integral part of these financial statements. 20 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- (continued) 1,325,878 3.47 NR/NR Bayview Opportunity Master Fund Trust IIB LP, Floating Rate Note, 7/28/32 (144A) $ 1,325,878 1,598,252 0.35 CCC/Ba1 Bear Stearns Asset Backed Securities Trust, Floating Rate Note, 10/25/36 1,565,472 45,945 0.47 AAA/Aa3 Bear Stearns Asset Backed Securities Trust, Floating Rate Note, 11/25/35 45,442 218,894 0.62 AAA/NR Bear Stearns Asset Backed Securities Trust, Floating Rate Note, 3/25/35 207,030 8,885 0.72 AAA/NR Bear Stearns Asset Backed Securities Trust, Floating Rate Note, 8/25/34 8,246 305,801 AA/NR CarNow Auto Receivables Trust 2012-1, 2.09%, 1/15/15 (144A) 305,943 1,723,755 0.95 AA/Aa1 Carrington Mortgage Loan Trust, Floating Rate Note, 2/25/35 1,680,010 2,950,614 0.40 AA/Ba3 Carrington Mortgage Loan Trust, Floating Rate Note, 2/25/36 2,854,917 533,670 0.34 A+/Ba1 Carrington Mortgage Loan Trust, Floating Rate Note, 2/25/37 527,110 125,837 0.62 AAA/Baa1 Carrington Mortgage Loan Trust, Floating Rate Note, 9/25/35 121,518 1,008,329 3.65 AAA/Aaa Centex Home Equity, Floating Rate Note, 3/25/33 1,008,550 2,142,400 0.37 BB/Ba3 Citigroup Mortgage Loan Trust 2007-WFH2, Floating Rate Note, 3/25/37 2,134,231 1,036,315 0.32 BBB/A3 Citigroup Mortgage Loan Trust, Inc., Floating Rate Note, 1/25/37 1,033,607 186,910 0.58 AAA/Aa2 Citigroup Mortgage Loan Trust, Inc., Floating Rate Note, 10/25/34 185,842 69,244 0.62 AAA/NR Citigroup Mortgage Loan Trust, Inc., Floating Rate Note, 5/25/35 (144A) 68,096 504,909 1.12 A-/Baa1 Citigroup Mortgage Loan Trust, Inc., Floating Rate Note, 7/25/37 499,482 595,000 1.02 NR/Aaa CNH Wholesale Master Note Trust, Floating Rate Note, 12/15/15 (144A) 595,925 2,405,000 1.87 NR/A2 CNH Wholesale Master Note Trust, Floating Rate Note, 12/15/15 (144A) 2,408,466 293,030 4.27 NR/NR Conn Funding II LP, Floating Rate Note, 4/15/16 (144A) 292,667 33,376 NR/Baa3 Conseco Financial Corp., 7.05%, 1/15/19 33,773 437,304 0.84 AA+/Aa1 Countrywide Asset-Backed Certificates, Floating Rate Note, 1/25/35 436,501 67,738 0.59 AAA/A2 Countrywide Asset-Backed Certificates, Floating Rate Note, 1/25/36 64,982 3,808,766 1.06 AA/Baa2 Countrywide Asset-Backed Certificates, Floating Rate Note, 10/25/34 3,789,227 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 21 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- (continued) 2,000,000 0.92 AA+/Ba1 Countrywide Asset-Backed Certificates, Floating Rate Note, 12/25/34 $ 1,915,576 329,764 0.33 BBB-/Ba3 Countrywide Asset-Backed Certificates, Floating Rate Note, 5/25/37 327,488 661,986 0.33 BBB/B1 Countrywide Asset-Backed Certificates, Floating Rate Note, 5/25/47 655,716 238,261 0.56 AAA/A1 Countrywide Asset-Backed Certificates, Floating Rate Note, 6/25/33 (144A) 229,758 1,017,575 0.73 AA+/A1 Countrywide Asset-Backed Certificates, Floating Rate Note, 6/25/35 980,291 1,221,415 0.66 AA/A2 Countrywide Asset-Backed Certificates, Floating Rate Note, 7/25/35 1,220,127 28,378 0.27 A/Ba1 Countrywide Asset-Backed Certificates, Floating Rate Note, 7/25/37 28,320 890,367 0.57 A/Ba2 Countrywide Asset-Backed Certificates, Floating Rate Note, 8/25/47 880,157 124,233 0.57 BBB/Baa3 Countrywide Home Equity Loan Trust, Floating Rate Note, 11/15/28 121,672 842,067 0.57 BBB-/Ba3 Countrywide Home Equity Loan Trust, Floating Rate Note, 3/15/29 818,691 365,821 0.48 BBB/B2 Countrywide Home Equity Loan Trust, Floating Rate Note, 6/15/29 338,688 2,000,000 AA/NR Credit Acceptance Auto Loan Trust, 2.21%, 9/15/20 (144A) 1,999,543 2,338 D/NR Delta Funding Home Equity Loan Trust, 7.04%, 6/25/27 2,497 35,853 A-/WR Equivantage Home Equity Loan Trust, 8.05%, 3/25/28 (Step) 35,370 1,000,000 AA/NR Exeter Automobile Receivables Trust, 1.3%, 6/15/17 (144A) 999,899 205,612 AA/NR Exeter Automobile Receivables Trust, 2.02%, 8/15/16 (144A) 205,994 1,000,000 BBB/NR Exeter Automobile Receivables Trust, 3.06%, 7/16/18 (144A) 999,743 711,034 0.73 NR/Baa1 First Franklin Mortgage Loan Trust 2005-FFH3, Floating Rate Note, 9/25/35 690,099 197,890 0.76 AAA/NR First Franklin Mortgage Loan Trust 2004-FF10, Floating Rate Note, 9/25/34 192,718 1,341,332 0.28 A/Aa1 First Franklin Mortgage Loan Trust 2006-FF14, Floating Rate Note, 10/25/36 1,335,264 1,167,633 NR/NR First Investors Auto Owner Trust 2012-2, 0.451%, 8/15/13 (144A) 1,167,775 1,443,422 0.65 AA/A3 Fremont Home Loan Trust, Floating Rate Note, 4/25/35 1,411,673 490,283 0.68 AA+/Aa1 Fremont Home Loan Trust, Floating Rate Note, 6/25/35 481,168 The accompanying notes are an integral part of these financial statements. 22 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- (continued) 3,051 NR/Aa2 Greenpoint Manufactured Housing, 7.59%, 11/15/28 $ 3,048 1,318,789 0.44 AAA/B1 Greenpoint Mortgage Funding Trust, Floating Rate Note, 7/25/30 1,300,774 130,273 0.43 AAA/A1 GSAA Trust, Floating Rate Note, 6/25/35 130,217 290,641 0.59 AAA/Aa2 GSAA Trust, Floating Rate Note, 9/25/34 285,175 423,111 0.77 AAA/Aaa GSAMP Trust 2004-SEA2, Floating Rate Note, 3/25/34 416,897 3,506,052 0.52 A/NR GSAMP Trust 2006-SEA1, Floating Rate Note, 5/25/36 (144A) 3,446,786 230,000 AAA/Aaa Honda Auto Receivables Owner Trust, 1.98%, 5/23/16 231,818 114,587 0.27 BB+/Ba3 HSI Asset Securitization Corp Trust 2007-OPT1, Floating Rate Note, 12/25/36 113,529 462,520 0.49 A/Ba1 Indymac Residential Asset Backed Trust, Floating Rate Note, 10/25/35 443,199 93,693 0.56 AAA/Aaa Indymac Residential Asset Backed Trust, Floating Rate Note, 8/25/35 92,654 178,316 0.48 AAA/Aa2 Lehman XS Trust, Floating Rate Note, 11/25/35 179,952 500,000 2.47 BBB+/Baa3 Madison Avenue Manufactured Housing Contract, Floating Rate Note, 3/25/32 464,160 321,703 0.42 BBB-/Baa1 Morgan Stanley ABS Capital I, Floating Rate Note, 12/25/35 315,921 123,347 0.54 AAA/Ba1 Morgan Stanley Home Equity Loan Trust, Floating Rate Note, 9/25/35 111,294 113,564 AA-/Aa3 Option One Mortgage Loan Trust, 5.9%, 3/25/37 (Step) 111,985 176,400 0.48 AA+/Aa3 Option One Mortgage Loan Trust, Floating Rate Note, 11/25/35 173,322 282,675 0.62 AAA/NR Option One Mortgage Loan Trust, Floating Rate Note, 2/25/35 263,851 582,380 0.84 AA+/A1 Park Place Securities, Inc., Floating Rate Note, 10/25/34 569,160 684,264 0.92 AA+/Aa1 Park Place Securities, Inc., Floating Rate Note, 12/25/34 681,786 1,139,936 0.90 AA/Aa2 Park Place Securities, Inc., Floating Rate Note, 12/25/34 1,134,153 126,331 0.81 AA+/Aa1 Park Place Securities, Inc., Floating Rate Note, 2/25/35 126,009 220,723 0.92 AAA/Aaa PFS Financing Corp., Floating Rate Note, 10/17/16 (144A) 220,773 325,276 1.72 A/NR PFS Financing Corp., Floating Rate Note, 10/17/16 (144A) 325,413 578,000 1.42 AAA/Aaa PFS Financing Corp., Floating Rate Note, 2/15/16 (144A) 579,973 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 23 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- (continued) 1,779,023 0.52 AAA/A1 RAAC Series, Floating Rate Note, 10/25/45 (144A) $ 1,748,707 26,642 AAA/Baa2 RAMP Trust, 5.06%, 6/25/32 (Step) 27,131 480,328 0.41 B+/B2 RAMP Trust, Floating Rate Note, 1/25/36 457,527 120,351 0.51 AAA/Baa2 RAMP Trust, Floating Rate Note, 10/25/33 118,686 411,985 0.84 AA/Baa1 RAMP Trust, Floating Rate Note, 11/25/34 402,496 145,619 0.42 AAA/A3 RAMP Trust, Floating Rate Note, 2/25/36 140,942 432,732 0.49 AAA/A1 RAMP Trust, Floating Rate Note, 9/25/35 428,410 518,827 0.44 AAA/Baa3 RASC Trust, Floating Rate Note, 2/25/36 505,576 421,140 0.65 AA/Baa2 RASC Trust, Floating Rate Note, 4/25/35 411,415 881,819 0.67 NR/Aa1 RFSC Series 2003-RP2 Trust, Floating Rate Note, 6/25/33 (144A) 846,546 229,098 0.70 AAA/NR Salomon Brothers Mortgage Securities VII, Inc., Floating Rate Note, 3/25/28 219,452 849,625 0.33 BBB-/Ba3 Saxon Asset Securities Trust, Floating Rate Note, 10/25/46 834,494 220,731 0.40 AAA/Aaa SLC Student Loan Trust, Floating Rate Note, 6/15/20 220,396 215,007 0.54 AAA/Aaa SLC Student Loan Trust, Floating Rate Note, 8/15/19 215,014 668,354 NR/Aaa SMART Trust/Australia, 1.22%, 11/14/13 (144A) 669,225 500,000 0.77 NR/Aaa SMART Trust/Australia, Floating Rate Note, 3/14/15 (144A) 499,370 1,267,230 AA/NR SNAAC Auto Receivables Trust, 1.78%, 6/15/16 (144A) 1,269,579 1,511,208 0.67 AA/Aa2 Soundview Home Loan Trust 2005-DO1, Floating Rate Note, 5/25/35 1,504,285 1,500,000 NR/NR Stanwich Mortgage Loan Trust, 2.981%, 9/15/42 (144A) 1,500,000 1,062,763 0.42 CCC/Ba3 Structured Asset Investment Loan Trust 2006-1, Floating Rate Note, 1/25/36 1,004,381 12,882 B+/A2 Structured Asset Securities Corp., 4.51%, 2/25/35 (Step) 12,893 4,049,370 0.44 B-/Baa3 Structured Asset Securities Corp., Floating Rate Note, 10/25/36 (144A) 3,831,339 485,066 0.37 BB/Ba3 Structured Asset Securities Corp., Floating Rate Note, 5/25/37 (144A) 474,936 598,239 0.28 BB+/A3 Structured Asset Securities Corp., Floating Rate Note, 5/25/47 585,155 4,956,986 0.37 B-/B2 Structured Asset Securities Corp., Floating Rate Note, 7/25/36 (144A) 4,514,788 1,230,000 AAA/NR United Auto Credit Securitization Trust, 1.1%, 3/16/15 (144A) 1,229,895 The accompanying notes are an integral part of these financial statements. 24 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- (continued) 83,489 0.50 NR/Baa1 Wilshire Mortgage Loan Trust, Floating Rate Note, 5/25/28 $ 75,807 ------------- $ 85,423,089 ------------- Total Banks $ 85,937,123 ------------------------------------------------------------------------------------------------------ DIVERSIFIED FINANCIALS -- 9.1% Other Diversified Financial Services -- 2.6% 1,815,847 0.89 AA/Aaa Asset Backed Securities Corp Home Equity, Floating Rate Note, 2/25/35 $ 1,794,832 13,039 AAA/Aaa Capital Auto Receivables Asset Trust, 5.42%, 12/15/14 13,070 151,754 AAA/Aaa CNH Equipment Trust, 5.17%, 10/15/14 152,092 94,665 0.49 AAA/Baa2 Credit Suisse Mortgage Capital Certificates, Floating Rate Note, 10/25/36 (144A) 87,502 46,751 AA+/NR DT Auto Owner Trust 2011-1, 1.94%, 12/16/13 (144A) 46,768 662,368 AAA/NR DT Auto Owner Trust 2012-1, 1.05%, 1/15/15 (144A) 662,777 1,745,824 1.22 B/Ba1 Ellington Loan Acquisition Trust 2007-1, Floating Rate Note, 5/26/37 (144A) 1,727,527 173,025 1.02 B/Ba1 Ellington Loan Acquisition Trust 2007-1, Floating Rate Note, 5/27/37 (144A) 170,480 1,169,560 1.12 B+/Ba2 Ellington Loan Acquisition Trust 2007-2, Floating Rate Note, 5/25/37 (144A) 1,148,726 1,015,653 0.60 A+/Baa2 Home Equity Asset Trust, Floating Rate Note, 1/25/36 977,970 3,404,000 0.69 AA+/A3 Home Equity Asset Trust, Floating Rate Note, 12/25/35 3,327,036 308,238 0.33 CCC/Ba1 Home Equity Asset Trust, Floating Rate Note, 3/25/37 294,042 463,990 0.40 AAA/A1 Home Equity Asset Trust, Floating Rate Note, 7/25/36 460,234 109,063 0.33 BBB/A1 Home Equity Asset Trust, Floating Rate Note, 7/25/37 107,633 646,890 B/Ba1 JP Morgan Mortgage Acquisition Corp., 5.453%, 11/25/36 (Step) 645,333 1,836,262 0.44 BB+/Ba1 JP Morgan Mortgage Acquisition Corp., Floating Rate Note, 10/25/35 1,757,905 983,226 0.28 BB/Ba2 JP Morgan Mortgage Acquisition Corp., Floating Rate Note, 5/25/37 954,723 123,258 1.19 A/Ba3 Merrill Lynch Mortgage Investors, Inc., Floating Rate Note, 2/25/36 121,478 1,303,178 0.52 AA+/Aaa Nelnet Student Loan Trust, Floating Rate Note, 10/26/20 1,295,142 1,012,182 0.37 AA-/A3 Sierra Receivables Funding Co., LLC, Floating Rate Note, 3/20/19 (144A) 1,000,697 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 25 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Other Diversified Financial Services -- (continued) 593,432 1.22 A+/Baa3 Sierra Receivables Funding Co., LLC, Floating Rate Note, 9/20/19 (144A) $ 585,785 122,479 AAA/Aaa SVO VOI Mortgage Corp., 5.25%, 2/20/21 (144A) 123,340 693,333 0.47 A-/Baa1 Textainer Marine Containers, Ltd., Floating Rate Note, 5/15/20 (144A) 683,136 ------------- $ 18,138,228 ------------------------------------------------------------------------------------------------------ Specialized Finance -- 2.3% 1,869,032 0.70 AAA/Aaa Aegis Asset Backed Securities Trust, Floating Rate Note, 6/25/34 $ 1,841,152 2,000,000 1.97 AAA/Aaa Ally Master Owner Trust, Floating Rate Note, 1/15/15 (144A) 2,009,258 2,000,000 1.09 AAA/Aaa Ally Master Owner Trust, Floating Rate Note, 1/15/16 2,013,902 250,000 1.02 AAA/Aaa Ally Master Owner Trust, Floating Rate Note, 2/15/17 251,079 500,000 1.77 AAA/Aaa GE Dealer Floorplan Master Note Trust, Floating Rate Note, 10/20/14 (144A) 500,480 250,000 0.79 NR/Aaa GE Dealer Floorplan Master Note Trust, Floating Rate Note, 2/20/17 251,961 2,000,000 0.71 NR/Aaa GE Dealer Floorplan Master Note Trust, Floating Rate Note, 6/20/17 2,009,896 500,000 1.12 NR/Aa2 GE Dealer Floorplan Master Note Trust, Floating Rate Note, 6/20/17 500,000 250,000 0.82 NR/Aaa GE Dealer Floorplan Master Note Trust, Floating Rate Note, 7/20/16 250,938 1,580,000 1.47 AAA/Aaa Hyundai Floorplan Master Owner Trust, Floating Rate Note, 11/17/14 (144A) 1,582,233 236,456 0.47 AAA/Aa2 Mastr Asset Backed Securities Trust, Floating Rate Note, 10/25/35 227,588 3,988,490 0.45 CCC/A2 Mastr Asset Backed Securities Trust, Floating Rate Note, 2/25/36 3,900,751 1,000,000 1.37 AAA/Aaa Nissan Master Owner Trust Receivables, Floating Rate Note, 1/15/15 (144A) 1,003,086 ------------- $ 16,342,324 ------------------------------------------------------------------------------------------------------ Consumer Finance -- 3.0% 727,944 A+/NR American Credit Acceptance Receivables Trust 2012-2, 1.89%, 7/15/16 (144A) $ 728,425 875,000 1.47 AAA/Aaa American Express Credit Account Master Trust, Floating Rate Note, 3/15/17 895,511 150,000 0.92 AA+/A2 American Express Credit Account Master Trust, Floating Rate Note, 5/15/15 150,035 1,220,000 0.25 AAA/Aaa Capital One Multi-Asset Execution Trust, Floating Rate Note, 4/15/16 1,220,009 1,200,000 0.29 AAA/Aaa Citibank Credit Card Issuance Trust, Floating Rate Note, 10/20/14 1,200,048 The accompanying notes are an integral part of these financial statements. 26 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Consumer Finance -- (continued) 500,000 0.85 AA/A2 Citibank Credit Card Issuance Trust, Floating Rate Note, 11/7/14 $ 500,196 1,000,000 AA-/A2 CPS Auto Trust, 1.82%, 12/16/19 (144A) 1,000,457 400,000 0.43 AAA/Aaa Discover Card Master Trust, Floating Rate Note, 11/16/15 400,585 3,240,000 1.72 AA-/Aa3 Ford Credit Floorplan Master Owner Trust, Floating Rate Note, 1/15/16 3,252,672 325,000 1.87 AAA/Aaa Ford Credit Floorplan Master Owner Trust, Floating Rate Note, 12/15/14 (144A) 326,123 250,000 0.82 AAA/Aaa Ford Credit Floorplan Master Owner Trust, Floating Rate Note, 9/15/15 251,150 2,075,000 0.57 AAA/Aaa Ford Credit Floorplan Master Owner Trust, Floating Rate Note, 9/15/16 2,075,021 250,000 0.62 AAA/Aaa Golden Credit Card Trust, Floating Rate Note, 10/15/15 (144A) 250,566 2,000,000 0.28 AAA/Aaa MBNA Credit Card Master Note Trust, Floating Rate Note, 10/15/15 2,000,382 1,900,000 0.28 AAA/Aaa MBNA Credit Card Master Note Trust, Floating Rate Note, 6/15/15 1,900,091 300,000 0.44 A+/Aa2 MBNA Credit Card Master Note Trust, Floating Rate Note, 7/15/15 299,849 1,000,000 0.64 BBB/A3 MBNA Credit Card Master Note Trust, Floating Rate Note, 7/15/15 1,000,008 2,250,000 1.37 NR/Aaa Navistar Financial Dealer Note Master Trust, Floating Rate Note, 10/25/16 (144A) 2,266,348 250,000 1.67 AAA/Aaa Navistar Financial Dealer Note Master Trust, Floating Rate Note, 10/26/15 (144A) 250,225 475,000 4.47 AA/Aa2 Navistar Financial Dealer Note Master Trust, Floating Rate Note, 10/26/15 (144A) 476,282 76,215 0.58 AAA/Aaa SLM Student Loan Trust, Floating Rate Note, 4/25/19 76,172 216,091 0.85 AAA/Aaa SLM Student Loan Trust, Floating Rate Note, 7/27/20 (144A) 216,090 177,383 0.42 AA/Aaa SLM Student Loan Trust, Floating Rate Note, 9/15/22 177,119 300,000 0.43 AA/A3 World Financial Network Credit Card Master Trust, Floating Rate Note, 2/15/17 (144A) 298,448 ------------- $ 21,211,812 ------------------------------------------------------------------------------------------------------ Asset Management & Custody Banks -- 0.2% 1,507,083 0.39 BBB/Baa2 Triton Container Finance LLC, Floating Rate Note, 11/26/21 (144A) $ 1,465,084 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 27 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Investment Banking & Brokerage -- 1.0% 1,000,000 0.98 AAA/Aaa Chesapeake Funding LLC, Floating Rate Note, 11/7/23 (144A) $ 1,002,474 250,000 2.23 A/A2 Chesapeake Funding LLC, Floating Rate Note, 11/7/23 (144A) 250,642 650,000 1.48 AAA/Aaa Chesapeake Funding LLC, Floating Rate Note, 4/7/24 (144A) 655,283 664,791 1.97 AAA/Aaa Chesapeake Funding LLC, Floating Rate Note, 9/15/21 (144A) 670,110 200,000 1.97 AA+/Aaa Chesapeake Funding LLC, Floating Rate Note, 9/15/21 (144A) 201,000 2,400,000 1.97 AA-/Aa3 Chesapeake Funding LLC, Floating Rate Note, 9/15/21 (144A) 2,414,400 1,510,769 0.40 BBB/Baa3 CLI Funding LLC, Floating Rate Note, 8/18/21 (144A) 1,476,179 ------------- $ 6,670,088 ------------- Total Diversified Financials $ 63,827,536 ------------------------------------------------------------------------------------------------------ REAL ESTATE -- 0.0%+ Real Estate Services -- 0.0%+ 21,295 0.96 AAA/A1 Chase Funding Mortgage Loan Asset-Backed Certificates, Floating Rate Note, 10/25/32 $ 18,852 ------------- Total Real Estate $ 18,852 ------------------------------------------------------------------------------------------------------ TOTAL ASSET BACKED SECURITIES (Cost $182,484,377) $ 183,464,238 ------------------------------------------------------------------------------------------------------ COLLATERALIZED MORTGAGE OBLIGATIONS -- 28.2% CONSUMER SERVICES -- 0.1% Hotels, Resorts & Cruise Lines -- 0.1% 423,868 NR/Baa3 S2 Hospitality LLC, 4.5%, 4/15/25 (144A) $ 426,271 ------------- Total Consumer Services $ 426,271 ------------------------------------------------------------------------------------------------------ BANKS -- 14.2% Thrifts & Mortgage Finance -- 14.2% 720,957 2.85 AAA/Baa1 Adjustable Rate Mortgage Trust 2004-1, Floating Rate Note, 1/25/35 $ 714,913 37,526 0.96 AAA/Aaa Adjustable Rate Mortgage Trust 2004-4, Floating Rate Note, 3/25/35 37,553 5,122 0.78 AAA/Aaa Adjustable Rate Mortgage Trust 2005-2, Floating Rate Note, 6/25/35 5,126 764,543 5.75 NR/NR American General Mortgage Loan Trust, Floating Rate Note, 9/25/48 (144A) 766,397 200,000 1.58 AAA/Aaa Arkle Master Issuer Plc, Floating Rate Note, 5/17/60 (144A) 200,634 350,000 1.83 AAA/Aaa Arkle Master Issuer Plc, Floating Rate Note, 5/17/60 (144A) 352,988 The accompanying notes are an integral part of these financial statements. 28 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- (continued) 500,000 1.68 AAA/Aaa Arkle Master Issuer Plc, Floating Rate Note, 5/17/60 (144A) $ 503,603 2,275,000 1.39 NR/NR Banc of America Re-Remic Trust, Floating Rate Note, 8/15/29 (144A) 2,275,000 3,035,000 2.34 NR/NR Banc of America Re-Remic Trust, Floating Rate Note, 8/15/29 (144A) 3,035,000 445,506 0.49 AAA/Aaa Bayview Commercial Asset Trust, Floating Rate Note, 4/25/36 (144A) 441,508 584,826 3.02 NR/NR BCAP LLC Trust, Floating Rate Note, 6/27/36 (144A) 587,423 439,050 1.32 AAA/Baa2 Bear Stearns Asset Backed Securities Trust, Floating Rate Note, 10/25/33 404,939 13,329 0.36 A+/Aaa Citigroup Commercial Mortgage Trust, Floating Rate Note, 4/15/22 (144A) 13,094 1,238,868 0.39 BBB+/Aaa Citigroup Commercial Mortgage Trust, Floating Rate Note, 4/15/22 (144A) 1,192,287 1,772,180 0.43 BBB-/Aa2 Citigroup Commercial Mortgage Trust, Floating Rate Note, 4/15/22 (144A) 1,687,824 301,158 0.47 BB+/A2 Citigroup Commercial Mortgage Trust, Floating Rate Note, 4/15/22 (144A) 283,811 881,059 0.52 BB/A3 Citigroup Commercial Mortgage Trust, Floating Rate Note, 4/15/22 (144A) 821,499 61,424 AAA/NR Citigroup Mortgage Loan Trust, Inc., 6.5%, 6/25/16 62,361 80,314 0.56 AAA/Aaa COMM 2005-FL11 Mortgage Trust, Floating Rate Note, 11/15/17 (144A) 74,630 143,761 0.61 AA-/Aa1 COMM 2005-FL11 Mortgage Trust, Floating Rate Note, 11/15/17 (144A) 132,151 115,735 NR/Aaa COMM 2006-C8 Mortgage Trust, 5.248%, 12/10/46 116,384 290,577 0.32 AAA/Aaa COMM 2006-FL12 Mortgage Trust, Floating Rate Note, 12/15/20 (144A) 284,909 2,890,000 0.35 AA-/A1 COMM 2006-FL12 Mortgage Trust, Floating Rate Note, 12/15/20 (144A) 2,652,994 2,571,773 0.40 A+/A1 COMM 2007-FL14 Mortgage Trust, Floating Rate Note, 6/15/22 (144A) 2,450,858 445,168 5.11 NR/A2 COMM 2011-FL1 Mortgage Trust, Floating Rate Note, 7/17/28 (144A) 452,402 83,552 0.61 AAA/Aaa Countrywide Alternative Loan Trust, Floating Rate Note, 10/25/34 84,787 45,750 0.62 AAA/Aaa Countrywide Alternative Loan Trust, Floating Rate Note, 2/25/33 44,916 129,369 0.62 AAA/Baa3 Countrywide Alternative Loan Trust, Floating Rate Note, 3/25/34 124,698 433,296 0.77 AAA/NR Countrywide Alternative Loan Trust, Floating Rate Note, 7/25/33 428,752 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 29 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- (continued) 66,557 0.67 AAA/Ba1 Countrywide Alternative Loan Trust, Floating Rate Note, 9/25/34 $ 64,373 411,562 BB-/NR Countrywide Home Loan Mortgage Pass Through Trust, 5.25%, 1/25/35 413,334 1,705,949 0.76 AAA/Baa1 Countrywide Home Loan Mortgage Pass Through Trust, Floating Rate Note, 2/25/35 1,538,817 887,171 0.77 NR/Aa1 Countrywide Home Loan Mortgage Pass Through Trust, Floating Rate Note, 5/25/33 870,337 1,780,116 0.72 A-/NR Countrywide Home Loan Mortgage Pass Through Trust, Floating Rate Note, 6/25/18 1,744,316 184,843 0.62 AAA/NR Countrywide Home Loan Mortgage Pass Through Trust, Floating Rate Note, 8/25/18 177,259 1,794,343 AAA/Aaa Extended Stay America Trust 2010-ESH, 2.951%, 11/5/27 (144A) 1,800,284 103,953 AAA/Aaa First Union Lehman Brothers Bank of America Communities Mortgage Pass Through Certificates Series 1998-c2, 6.778%, 11/18/35 104,365 136,102 0.65 AA+/Aa2 GE Business Loan Trust 2003-1, Floating Rate Note, 4/15/31 (144A) 128,144 1,537,818 0.44 AA-/Aa1 GE Business Loan Trust 2004-2, Floating Rate Note, 12/15/32 (144A) 1,431,003 419,697 0.39 A/Aa3 GE Business Loan Trust 2007-1, Floating Rate Note, 4/16/35 (144A) 358,841 252,233 0.54 AAA/Baa2 Global Mortgage Securitization, Ltd., Floating Rate Note, 11/25/32 (144A) 232,918 25,895 AAA/Aaa GMAC Commercial Mortgage Securities, Inc., Series 2002-C3 Trust, 4.93%, 7/10/39 25,909 131,776 6.02 NR/NR GMAC Commercial Mortgage Securities, Inc., Floating Rate Note, 5/15/33 (144A) 135,216 900,000 NR/NR GS Mortgage Securities Corp., II, 3.563%, 2/10/21 (144A) 917,730 532,855 1.10 AAA/Aaa GS Mortgage Securities Corp., II, Floating Rate Note, 3/6/20 (144A) 532,655 2,520,000 1.26 AAA/Aaa GS Mortgage Securities Corp., II, Floating Rate Note, 3/6/20 (144A) 2,518,513 500,000 2.20 AA/NR GS Mortgage Securities Corp., II, Floating Rate Note, 3/6/20 (144A) 499,997 679,982 CCC/B1 GSR Mortgage Loan Trust, 5.0%, 7/25/35 688,634 152,197 2.81 AAA/NR GSR Mortgage Loan Trust, Floating Rate Note, 8/25/33 153,386 The accompanying notes are an integral part of these financial statements. 30 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- (continued) 301,377 2.65 AAA/NR GSR Mortgage Loan Trust, Floating Rate Note, 9/25/35 $ 302,424 349,861 1.36 AAA/Baa3 Harborview Mortgage Loan Trust, Floating Rate Note, 6/19/34 324,720 1,950,000 1.86 AAA/Aaa Holmes Master Issuer Plc, Floating Rate Note, 10/15/54 (144A) 1,978,246 2,070,900 0.64 NR/Baa1 HomeBanc Mortgage Trust 2005-2, Floating Rate Note, 5/25/25 1,905,477 649,809 0.57 AAA/Aa3 Homestar Mortgage Acceptance Corp., Floating Rate Note, 6/25/34 643,419 1,548,228 0.67 AAA/Aa2 Homestar Mortgage Acceptance Corp., Floating Rate Note, 7/25/34 1,529,191 475,835 1.12 AAA/Aaa Impac CMB Trust Series 2003-8, Floating Rate Note, 10/25/33 468,998 833,014 0.86 AAA/Ba3 Impac CMB Trust Series 2004-4, Floating Rate Note, 9/25/34 762,680 363,539 0.94 AAA/Baa2 Impac CMB Trust Series 2004-5, Floating Rate Note, 10/25/34 340,816 353,970 1.06 AAA/Aaa Impac CMB Trust Series 2004-5, Floating Rate Note, 8/25/34 351,667 812,417 0.96 AAA/A3 Impac CMB Trust Series 2004-7, Floating Rate Note, 11/25/34 768,163 684,929 0.63 AAA/Aaa Impac CMB Trust Series 2004-8, Floating Rate Note, 8/25/34 682,057 258,598 0.98 AAA/Ba2 Impac CMB Trust Series 2004-9, Floating Rate Note, 1/25/35 224,106 44,734 1.02 AAA/Aaa Impac Secured Assets CMN Owner Trust, Floating Rate Note, 11/25/34 44,573 757,081 0.57 AAA/Aaa Impac Secured Assets Trust 2006-1, Floating Rate Note, 5/25/36 748,105 218,230 0.57 AAA/Aaa Impac Secured Assets Trust 2006-2, Floating Rate Note, 8/25/36 219,520 330,519 NR/Aaa JP Morgan Chase Commercial Mortgage Securities Corp., 4.767%, 3/12/39 332,753 51,626 NR/Aaa JP Morgan Chase Commercial Mortgage Securities Corp., 5.305%, 1/15/49 52,025 38,580 NR/Aaa JP Morgan Chase Commercial Mortgage Securities Corp., 5.45%, 12/12/43 38,744 187,936 NR/Aaa JP Morgan Chase Commercial Mortgage Securities Corp., 5.819%, 6/12/43 192,496 3,907,542 0.35 NR/Aa2 JP Morgan Chase Commercial Mortgage Securities Corp., Floating Rate Note, 11/15/18 (144A) 3,847,323 809,178 0.43 NR/A2 JP Morgan Chase Commercial Mortgage Securities Corp., Floating Rate Note, 11/15/18 (144A) 780,250 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 31 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- (continued) 311,222 0.45 NR/A3 JP Morgan Chase Commercial Mortgage Securities Corp., Floating Rate Note, 11/15/18 (144A) $ 293,872 194,514 0.58 NR/Ba1 JP Morgan Chase Commercial Mortgage Securities Corp., Floating Rate Note, 11/15/18 (144A) 164,218 498,336 2.12 AAA/Aaa JP Morgan Chase Commercial Mortgage Securities Corp., Floating Rate Note, 11/15/28 (144A) 503,319 475,000 5.92 AAA/Aaa JP Morgan Chase Commercial Mortgage Securities Corp., Floating Rate Note, 2/12/49 497,293 257,000 6.45 NR/B3 JP Morgan Chase Commercial Mortgage Securities Corp., Floating Rate Note, 5/12/34 254,685 3,857,507 0.34 AAA/Aaa JP Morgan Chase Commercial Mortgage Securities Corp., Floating Rate Note, 5/15/47 3,834,944 200,000 0.38 A-/Aa3 JP Morgan Chase Commercial Mortgage Securities Corp., Floating Rate Note, 5/15/47 189,726 93,747 5.99 AAA/Aaa JP Morgan Chase Commercial Mortgage Securities Corp., Floating Rate Note, 6/15/49 96,833 87,654 0.60 NR/Aa1 JP Morgan Chase Commercial Mortgage Securities Corp., Floating Rate Note, 7/15/19 (144A) 84,981 350,000 4.65 AA-/A1 JP Morgan Chase Commercial Mortgage Securities Corp., Floating Rate Note, 7/15/28 (144A) 354,276 276,231 5.17 AAA/NR JP Morgan Chase Commercial Mortgage Securities Corp., Floating Rate Note, 8/12/40 276,274 90,990 2.37 AAA/Baa1 JP Morgan Mortgage Trust, Floating Rate Note, 10/25/33 94,262 81,900 4.43 AAA/A3 JP Morgan Mortgage Trust, Floating Rate Note, 2/25/35 82,620 453,458 3.04 BB+/NR JP Morgan Mortgage Trust, Floating Rate Note, 6/25/35 451,273 2,000,000 1.83 AAA/Aaa Lanark Master Issuer Plc, Floating Rate Note, 12/22/54 (144A) 2,049,333 748,652 AAA/Aaa LB-UBS Commercial Mortgage Trust, 3.973%, 3/15/29 764,641 432,147 AAA/Aaa LB-UBS Commercial Mortgage Trust, 4.664%, 7/15/30 435,335 229,148 AAA/Aaa LB-UBS Commercial Mortgage Trust, 4.83%, 11/15/27 231,504 605 AAA/Aaa LB-UBS Commercial Mortgage Trust, 5.532%, 3/15/32 605 The accompanying notes are an integral part of these financial statements. 32 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- (continued) 38,481 AAA/Aaa LB-UBS Commercial Mortgage Trust, 5.845%, 7/15/40 $ 39,620 383,323 6.33 AAA/Aaa LB-UBS Commercial Mortgage Trust, Floating Rate Note, 4/15/41 401,822 2,233,177 0.34 AAA/Aaa Lehman Brothers Floating Rate Commercial Mortgage Trust 2006-LLF C5, Floating Rate Note, 9/15/21 (144A) 2,188,513 1,500,000 0.72 BB+/Aa3 Lehman Brothers Floating Rate Commercial Mortgage Trust 2007-LLF C5, Floating Rate Note, 6/15/22 (144A) 1,471,802 725,000 1.12 B+/Baa3 Lehman Brothers Floating Rate Commercial Mortgage Trust 2007-LLF C5, Floating Rate Note, 6/15/22 (144A) 680,558 129,865 1.07 AAA/Aaa Lehman Brothers Small Balance Commercial Mortgage Trust 2007-3, Floating Rate Note, 10/25/37 (144A) 126,095 173,218 1.17 A+/Aa1 Lehman Brothers Small Balance Commercial Mortgage Trust 2007-3, Floating Rate Note, 10/25/37 (144A) 172,157 178,323 0.47 A+/Aa3 Lehman Brothers Small Balance Commercial, Floating Rate Note, 9/25/30 (144A) 146,330 1,009,966 2.41 AAA/Baa2 MASTR Adjustable Rate Mortgages Trust 2003-3, Floating Rate Note, 9/25/33 1,002,106 601,629 2.62 AAA/Aa2 MASTR Adjustable Rate Mortgages Trust 2004-13, Floating Rate Note, 11/21/34 605,184 95,324 AAA/NR MASTR Asset Securitization Trust 2003-6, 4.5%, 7/25/13 95,511 625,450 0.62 AAA/NR MASTR Asset Securitization Trust 2003-6, Floating Rate Note, 7/25/18 617,760 3,540 AAA/NR MASTR Asset Securitization Trust 2004-3, 4.75%, 1/25/14 3,572 499,189 0.88 AA+/Aa3 Merrill Lynch Mortgage Investors Trust Series MLCC 2003-C, Floating Rate Note, 6/25/28 493,816 227,120 0.68 AAA/A3 Merrill Lynch Mortgage Investors Trust Series MLCC 2004-A, Floating Rate Note, 4/25/29 220,569 921,234 2.49 AA+/Baa2 Merrill Lynch Mortgage Investors Trust Series MLCC 2004-D, Floating Rate Note, 9/25/29 914,145 2,538,456 0.55 A+/Ba2 Merrill Lynch Mortgage Investors Trust Series MLCC 2004-E, Floating Rate Note, 11/25/29 2,388,469 368,087 0.68 AA+/Baa2 Merrill Lynch Mortgage Investors Trust Series MLCC 2005-A, Floating Rate Note, 3/25/30 360,892 260,000 5.24 AAA/NR Merrill Lynch Mortgage Trust, Floating Rate Note, 11/12/35 270,527 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 33 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- (continued) 1,595,589 0.49 A/NR Morgan Stanley Re-REMIC Trust 2010-R4, Floating Rate Note, 7/26/36 (144A) $ 1,568,491 699,170 1.00 AAA/Baa1 Mortgage IT Trust 2004-1, Floating Rate Note, 11/25/34 664,536 265,347 0.59 AAA/A2 Mortgage IT Trust 2004-2, Floating Rate Note, 12/25/34 253,192 1,250,154 0.60 AA+/Aaa NCUA Guaranteed Notes Trust 2010-R2, Floating Rate Note, 11/6/17 1,253,280 1,153,052 0.79 NR/Aaa NCUA Guaranteed Notes Trust 2010-R3, Floating Rate Note, 12/8/20 1,159,971 350,686 0.79 NR/Aaa NCUA Guaranteed Notes Trust 2010-R3, Floating Rate Note, 12/8/20 353,317 1,885,853 0.76 NR/Aaa NCUA Guaranteed Notes Trust 2011-C1, Floating Rate Note, 3/9/21 1,887,179 837,522 0.63 AA+/Aaa NCUA Guaranteed Notes Trust 2011-R3, Floating Rate Note, 3/11/20 842,234 605,118 0.61 AA+/NR NCUA Guaranteed Notes Trust 2011-R5, Floating Rate Note, 4/6/20 607,726 1,088,761 0.48 AAA/A3 Opteum Mortgage Acceptance Corp., Floating Rate Note, 7/25/35 1,073,079 175,001 0.62 AAA/NR Residential Asset Securitization Trust, Floating Rate Note, 5/25/33 157,871 171,256 0.72 AAA/NR Residential Asset Securitization Trust, Floating Rate Note, 7/25/33 170,385 15,183 2.00 NR/Aaa SAECURE 11 BV, Floating Rate Note, 7/30/92 15,495 365,197 7.37 NR/Aaa Salomon Brothers Mortgage Securities VII, Inc., Floating Rate Note, 5/18/32 (144A) 372,514 764,712 1.07 AA+/Baa3 Sequoia Mortgage Trust 2003-2, Floating Rate Note, 6/20/33 735,194 309,153 0.84 AA+/Baa3 Sequoia Mortgage Trust 2003-5, Floating Rate Note, 9/20/33 296,066 680,616 0.86 AAA/Baa1 Sequoia Mortgage Trust 2003-8, Floating Rate Note, 1/20/34 660,411 511,073 0.54 A+/Baa3 Sequoia Mortgage Trust 2004-10, Floating Rate Note, 11/20/34 504,428 1,179,543 0.49 AAA/Baa1 Sequoia Mortgage Trust 2004-12, Floating Rate Note, 1/20/35 1,060,737 174,145 1.02 AAA/A3 Sequoia Mortgage Trust 2004-12, Floating Rate Note, 1/20/35 153,387 315,943 2.10 AA+/Baa3 Sequoia Mortgage Trust 2004-7, Floating Rate Note, 8/20/34 318,752 284,405 0.45 AA+/B1 Sequoia Mortgage Trust 2005-1, Floating Rate Note, 2/20/35 274,372 181,250 0.44 AA+/Ba3 Sequoia Mortgage Trust 2005-2, Floating Rate Note, 3/20/35 176,722 The accompanying notes are an integral part of these financial statements. 34 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- (continued) 318,664 0.94 A-/A2 Sequoia Mortgage Trust 4, Floating Rate Note, 11/22/24 $ 316,183 88,579 0.48 AAA/Aaa Series 2007-1G WST Trust, Floating Rate Note, 5/21/38 (144A) 87,156 1,068,951 0.92 AAA/A3 Structured Asset Mortgage Investments, Inc., Floating Rate Note, 3/19/34 1,030,688 379,673 2.90 AAA/Baa3 Structured Asset Securities Corp., Floating Rate Note, 10/25/33 381,524 762,101 0.87 NR/NR Structured Asset Securities Corp., Floating Rate Note, 10/25/37 (144A) 749,717 346,001 0.72 AAA/Baa3 Structured Asset Securities Corp., Floating Rate Note, 12/25/33 334,518 351,706 2.78 AAA/Baa3 Structured Asset Securities Corp., Floating Rate Note, 7/25/33 345,041 532,081 0.52 A/Ba3 Structured Asset Securities Corp., Floating Rate Note, 7/25/35 474,961 796,542 1.16 AA/NR Structured Asset Securities Corp., Floating Rate Note, 8/25/28 753,063 214,422 0.46 AAA/Aaa Superannuation Members Home Loans Global Fund, Floating Rate Note, 6/12/40 207,714 406,114 1.91 AAA/Ba1 Thornburg Mortgage Securities Trust, Floating Rate Note, 3/25/44 398,706 82,280 AAA/Aaa Wachovia Bank Commercial Mortgage Trust, 4.79%, 4/15/42 84,780 2,534,077 0.30 A+/Aaa Wachovia Bank Commercial Mortgage Trust, Floating Rate Note, 6/15/20 (144A) 2,427,988 65,502 5.09 AAA/Aaa Wachovia Bank Commercial Mortgage Trust, Floating Rate Note, 7/15/42 66,327 433,166 0.31 AA+/Aaa Wachovia Bank Commercial Mortgage Trust, Floating Rate Note, 9/15/21 (144A) 419,167 278,163 2.40 AAA/A3 WaMu Mortgage Pass Through Certificates, Floating Rate Note, 1/25/33 279,948 208,482 2.45 AA/NR WaMu Mortgage Pass Through Certificates, Floating Rate Note, 1/25/35 211,073 648,404 2.46 AA+/Ba2 WaMu Mortgage Pass Through Certificates, Floating Rate Note, 2/25/33 647,476 313,780 0.62 NR/A2 WaMu Mortgage Pass Through Certificates, Floating Rate Note, 3/25/34 308,307 774,651 B+/NR Wells Fargo Mortgage Backed Securities Trust, 4.5%, 1/25/19 779,713 98,461 5.02 NR/Ba2 Wells Fargo Mortgage Backed Securities Trust, Floating Rate Note, 4/25/35 100,522 ------------- $ 98,930,578 ------------- Total Banks $ 98,930,578 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 35 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ DIVERSIFIED FINANCIALS -- 4.4% Other Diversified Financial Services -- 3.5% 204,831 1.63 NR/Aaa Arran Residential Mortgages Funding Plc, Floating Rate Note, 11/19/47 (144A) $ 205,572 206,026 1.64 NR/Aaa Arran Residential Mortgages Funding Plc, Floating Rate Note, 5/16/47 (144A) 206,241 106,304 4.78 AAA/Baa3 Bear Stearns ALT-A Trust 2003-3, Floating Rate Note, 10/25/33 104,673 751,599 0.96 A+/Baa1 Bear Stearns ALT-A Trust 2004-13, Floating Rate Note, 11/25/34 733,661 1,437,646 0.92 AAA/Baa2 Bear Stearns ALT-A Trust 2004-8, Floating Rate Note, 9/25/34 1,395,366 201,794 0.72 AAA/Baa2 Bear Stearns ALT-A Trust 2005-2, Floating Rate Note, 3/25/35 194,242 164,664 0.55 AAA/Ba1 CC Funding Corp., DE, Floating Rate Note, 1/25/35 (144A) 134,219 82,037 0.52 AAA/Ba2 CC Funding Corp., DE, Floating Rate Note, 8/25/35 (144A) 62,927 132,234 NR/A2 Citicorp Mortgage Securities, Inc., 4.75%, 1/25/34 134,282 43,487 NR/Baa3 Citicorp Mortgage Securities, Inc., 5.0%, 7/25/20 45,764 250,000 NR/B2 Citicorp Mortgage Securities, Inc., 6.25%, 6/25/36 251,831 262,161 5.95 AAA/Aaa Commercial Mortgage Pass-Through Certificates Series 2007-C4, Floating Rate Note, 9/15/39 262,880 900,585 0.34 BBB+/Aaa Commercial Mortgage Pass-Through Certificates Series 2007-TFL1, Floating Rate Note, 2/15/22 (144A) 875,640 2,969,286 0.39 AAA/Aa2 Credit Suisse Mortgage Capital Certificates, Floating Rate Note, 10/15/21 (144A) 2,885,020 100,156 0.52 AAA/Aaa Crusade Global Trust, Floating Rate Note, 4/19/38 96,968 100,662 AAA/Aaa Greenwich Capital Commercial Funding Corp., 4.111%, 7/5/35 101,844 5,523 AAA/Aaa Greenwich Capital Commercial Funding Corp., 5.117%, 4/10/37 5,518 817,262 5.95 B-/Caa1 JP Morgan Alternative Loan Trust, Floating Rate Note, 9/25/36 827,425 151,914 2.53 B-/NR Merrill Lynch Mortgage Investors, Inc., Floating Rate Note, 2/25/35 153,757 119,016 AAA/NR Morgan Stanley Capital I Trust 2005-HQ6, 4.882%, 8/13/42 120,044 1,330,207 0.32 AA+/Aaa Morgan Stanley Capital I, Inc., Floating Rate Note, 10/15/20 (144A) 1,323,706 1,750,000 0.35 A+/Aa3 Morgan Stanley Capital I, Inc., Floating Rate Note, 10/15/20 (144A) 1,645,000 The accompanying notes are an integral part of these financial statements. 36 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Other Diversified Financial Services -- (continued) 100,000 0.82 A+/A1 Morgan Stanley Capital I, Inc., Floating Rate Note, 12/15/20 (144A) $ 92,956 100,000 0.92 BBB+/A3 Morgan Stanley Capital I, Inc., Floating Rate Note, 12/15/20 (144A) 91,956 2,000,000 6.34 AA-/NR Morgan Stanley Capital I, Inc., Floating Rate Note, 7/15/30 (144A) 2,042,736 3,000,000 NR/NR ORES NPL LLC, 4.0%, 9/25/44 (144A) 3,015,000 592,608 AAA/Ba3 RALI Trust, 4.75%, 4/25/34 594,338 94,450 NR/B3 RALI Trust, 5.5%, 12/25/34 93,495 84,632 0.77 AAA/Ba1 RALI Trust, Floating Rate Note, 1/25/34 80,832 90,048 0.77 NR/Baa1 RALI Trust, Floating Rate Note, 10/25/17 84,802 1,307,210 0.67 AAA/NR RALI Trust, Floating Rate Note, 12/26/33 1,188,541 2,532,633 0.67 AAA/NR RALI Trust, Floating Rate Note, 3/25/18 2,459,075 36,737 0.82 AAA/Ba3 RALI Trust, Floating Rate Note, 4/25/34 34,085 191,304 0.72 AAA/Ba1 RALI Trust, Floating Rate Note, 6/25/33 179,241 100,769 3.22 AAA/Ba2 Structured Adjustable Rate Mortgage Loan Trust, Floating Rate Note, 3/25/34 99,254 574,039 2.75 AAA/A3 Structured Adjustable Rate Mortgage Loan Trust, Floating Rate Note, 3/25/34 566,654 123,820 0.62 AAA/A3 Structured Adjustable Rate Mortgage Loan Trust, Floating Rate Note, 6/25/35 123,239 2,000,000 NR/NR Vericrest Opportunity Loan Transferee, 2.487%, 2/26/52 (144A) 2,004,060 145,191 4.21 NR/NR Vericrest Opportunity Loan Trust 2012-NPL1, Floating Rate Note, 3/25/49 (144A) 145,823 ------------- $ 24,662,667 ------------------------------------------------------------------------------------------------------ Specialized Finance -- 0.5% 1,308,743 1.86 AAA/Aaa Fosse Master Issuer Plc, Floating Rate Note, 10/18/54 (144A) $ 1,324,491 1,000,000 1.86 AAA/Aaa Fosse Master Issuer Plc, Floating Rate Note, 10/18/54 (144A) 1,020,423 183,387 BB/B2 Nomura Asset Acceptance Corp., 4.786%, 3/25/35 182,518 262,583 2.62 AAA/Aaa Nomura Asset Acceptance Corp., Floating Rate Note, 12/25/34 265,578 100,000 1.61 AAA/Aaa Permanent Master Issuer Plc, Floating Rate Note, 7/15/42 (144A) 100,268 500,000 1.86 AAA/Aaa Permanent Master Issuer Plc, Floating Rate Note, 7/15/42 (144A) 506,712 ------------- $ 3,399,990 ------------------------------------------------------------------------------------------------------ Consumer Finance -- 0.1% 572,467 3.56 BB+/Baa3 GMAC Mortgage Corp., Loan Trust, Floating Rate Note, 6/19/35 $ 580,646 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 37 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Investment Banking & Brokerage -- 0.3% 50,733 AAA/NR Banc of America Merrill Lynch Commercial Mortgage, Inc., 4.512%, 12/10/42 $ 51,455 26,947 BBB+/Aaa Banc of America Merrill Lynch Commercial Mortgage, Inc., 6.309%, 6/11/35 26,976 125,000 B+/Aa1 Banc of America Merrill Lynch Commercial Mortgage, Inc., 6.349%, 6/11/35 122,438 877,652 4.87 AAA/NR Banc of America Merrill Lynch Commercial Mortgage, Inc., Floating Rate Note, 3/11/41 886,435 1,250,000 5.06 AAA/NR Banc of America Merrill Lynch Commercial Mortgage, Inc., Floating Rate Note, 3/11/41 1,288,168 18,048 AAA/Aaa Bear Stearns Commercial Mortgage Securities, 4.8%, 1/12/41 18,124 45,000 7.61 BB-/NR Morgan Stanley Dean Witter Capital I, Floating Rate Note, 2/15/33 (144A) 44,043 ------------- $ 2,437,639 ------------- Total Diversified Financials $ 31,080,942 ------------------------------------------------------------------------------------------------------ REAL ESTATE -- 0.9% Mortgage REIT's -- 0.1% 83,518 A-/NR Credit Suisse First Boston Mortgage Securities Corp., 5.5%, 7/25/35 $ 83,825 73,248 1.57 AA+/Aa2 Credit Suisse First Boston Mortgage Securities Corp., Floating Rate Note, 12/25/33 69,863 352,836 0.96 AAA/Baa1 Credit Suisse First Boston Mortgage Securities Corp., Floating Rate Note, 6/25/34 342,198 202,262 5.07 NR/Aaa Credit Suisse First Boston Mortgage Securities Corp., Floating Rate Note, 8/15/38 203,125 ------------- $ 699,011 ------------------------------------------------------------------------------------------------------ Diversified Real Estate Activities -- 0.2% 1,105,943 0.66 AAA/Aaa Mellon Residential Funding Corp., Floating Rate Note, 12/15/30 $ 1,100,693 636,802 0.70 AAA/Aaa Mellon Residential Funding Corp., Floating Rate Note, 6/15/30 638,594 ------------- $ 1,739,287 ------------------------------------------------------------------------------------------------------ Real Estate Services -- 0.6% 4,074,290 0.97 AA+/Aa1 Banc of America Large Loan Trust 2007-BMB1, Floating Rate Note, 8/15/29 (144A) $ 3,964,679 The accompanying notes are an integral part of these financial statements. 38 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Real Estate Services -- (continued) 108,565 0.43 AAA/NR Banc of America Large Loan, Inc., Floating Rate Note, 10/15/19 (144A) $ 105,308 ------------- $ 4,069,987 ------------- Total Real Estate $ 6,508,285 ------------------------------------------------------------------------------------------------------ GOVERNMENT -- 8.6% 1,537,145 NR/NR DBRR Trust, 0.946%, 9/25/45 (144A) $ 1,538,917 1,220,359 0.55 NR/NR Fannie Mae REMIC Trust 2007-W3, Floating Rate Note, 4/25/37 1,223,572 255,000 NR/NR Fannie Mae REMICS, 3.5%, 10/25/39 268,176 46,266 NR/NR Fannie Mae REMICS, 3.5%, 12/25/31 47,021 218,080 NR/NR Fannie Mae REMICS, 4.5%, 1/25/32 219,967 378,516 NR/NR Fannie Mae REMICS, 4.5%, 1/25/38 388,575 212,719 NR/NR Fannie Mae REMICS, 4.5%, 11/25/31 214,467 88,838 NR/NR Fannie Mae REMICS, 4.5%, 2/25/33 89,904 61,300 NR/NR Fannie Mae REMICS, 5.0%, 8/25/35 61,932 120,000 NR/NR Fannie Mae REMICS, 6.0%, 3/25/27 126,300 435,841 NR/NR Fannie Mae REMICS, 6.0%, 3/25/35 461,594 76,651 NR/NR Fannie Mae REMICS, 7.0%, 6/25/13 77,875 852,620 0.92 NR/NR Fannie Mae REMICS, Floating Rate Note, 1/25/32 863,331 842,730 0.77 NR/NR Fannie Mae REMICS, Floating Rate Note, 1/25/40 851,876 1,173,597 0.62 NR/NR Fannie Mae REMICS, Floating Rate Note, 10/25/36 1,180,212 307,810 0.77 NR/NR Fannie Mae REMICS, Floating Rate Note, 10/25/37 310,118 973,366 0.82 NR/NR Fannie Mae REMICS, Floating Rate Note, 11/25/31 984,349 856,562 0.82 NR/NR Fannie Mae REMICS, Floating Rate Note, 11/25/31 860,937 1,864,005 0.72 NR/NR Fannie Mae REMICS, Floating Rate Note, 11/25/33 1,877,814 185,875 0.82 NR/NR Fannie Mae REMICS, Floating Rate Note, 12/25/23 187,822 622,864 1.22 NR/NR Fannie Mae REMICS, Floating Rate Note, 12/25/23 634,133 155,091 0.77 NR/NR Fannie Mae REMICS, Floating Rate Note, 12/25/30 156,658 893,112 1.12 NR/NR Fannie Mae REMICS, Floating Rate Note, 12/25/31 909,190 646,961 0.72 NR/NR Fannie Mae REMICS, Floating Rate Note, 12/25/32 652,396 813,247 0.52 NR/NR Fannie Mae REMICS, Floating Rate Note, 12/25/35 815,881 370,571 0.62 NR/NR Fannie Mae REMICS, Floating Rate Note, 12/25/38 370,379 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 39 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Government -- (continued) 57,941 0.67 AAA/NR Fannie Mae REMICS, Floating Rate Note, 2/25/17 $ 58,149 75,045 0.92 NR/NR Fannie Mae REMICS, Floating Rate Note, 2/25/32 75,095 282,793 0.97 NR/NR Fannie Mae REMICS, Floating Rate Note, 2/25/33 285,892 342,718 0.72 NR/NR Fannie Mae REMICS, Floating Rate Note, 3/25/23 344,304 512,968 0.52 NR/NR Fannie Mae REMICS, Floating Rate Note, 3/25/28 492,154 274,174 0.87 NR/NR Fannie Mae REMICS, Floating Rate Note, 4/25/30 277,051 644,562 0.72 NR/NR Fannie Mae REMICS, Floating Rate Note, 4/25/33 649,221 621,004 0.72 NR/NR Fannie Mae REMICS, Floating Rate Note, 4/25/42 624,683 376,699 0.72 NR/NR Fannie Mae REMICS, Floating Rate Note, 5/25/19 376,931 413,656 0.82 NR/NR Fannie Mae REMICS, Floating Rate Note, 5/25/40 417,970 3,940,681 0.72 NR/NR Fannie Mae REMICS, Floating Rate Note, 5/25/40 3,952,890 234,513 0.62 NR/NR Fannie Mae REMICS, Floating Rate Note, 6/25/23 235,251 56,465 0.75 NR/NR Fannie Mae REMICS, Floating Rate Note, 7/18/27 56,840 942,040 0.82 NR/NR Fannie Mae REMICS, Floating Rate Note, 7/25/31 952,672 623,941 0.82 NR/NR Fannie Mae REMICS, Floating Rate Note, 7/25/31 632,307 238,664 0.67 NR/NR Fannie Mae REMICS, Floating Rate Note, 7/25/34 240,356 3,022,164 0.52 NR/NR Fannie Mae REMICS, Floating Rate Note, 7/25/35 3,029,804 709,013 0.47 NR/NR Fannie Mae REMICS, Floating Rate Note, 7/25/35 709,016 525,704 0.51 NR/NR Fannie Mae REMICS, Floating Rate Note, 7/25/36 527,912 193,900 0.82 NR/NR Fannie Mae REMICS, Floating Rate Note, 8/25/32 196,087 56,646 0.62 NR/NR Fannie Mae REMICS, Floating Rate Note, 8/25/33 56,805 635,745 0.77 NR/NR Fannie Mae REMICS, Floating Rate Note, 8/25/36 640,773 776,071 0.72 NR/NR Fannie Mae REMICS, Floating Rate Note, 9/25/32 782,823 252,887 0.97 NR/NR Fannie Mae REMICS, Floating Rate Note, 9/25/38 253,991 The accompanying notes are an integral part of these financial statements. 40 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Government -- (continued) 183,880 2.72 NR/NR Fannie Mae Trust 2005-W3, Floating Rate Note, 4/25/45 $ 186,912 314,278 2.26 NR/NR Fannie Mae Trust 2005-W4, Floating Rate Note, 6/25/35 337,863 88,436 NR/NR Freddie Mac REMICS, 3.5%, 11/15/22 90,405 532,863 NR/NR Freddie Mac REMICS, 4.0%, 1/15/24 546,450 85,193 NR/NR Freddie Mac REMICS, 4.0%, 11/15/23 89,781 545,338 NR/NR Freddie Mac REMICS, 5.0%, 10/15/31 553,616 17,347 AA+/NR Freddie Mac REMICS, 5.0%, 10/15/31 17,394 1,792,801 NR/NR Freddie Mac REMICS, 5.0%, 10/15/33 1,808,985 377,000 NR/NR Freddie Mac REMICS, 5.0%, 6/15/22 382,112 232,425 NR/NR Freddie Mac REMICS, 5.0%, 9/15/31 234,125 738,321 NR/NR Freddie Mac REMICS, 5.5%, 10/15/22 747,677 33,167 NR/NR Freddie Mac REMICS, 5.5%, 2/15/33 33,219 117,516 NR/NR Freddie Mac REMICS, 5.5%, 3/15/32 120,019 107,208 NR/NR Freddie Mac REMICS, 5.5%, 5/15/32 108,695 268,293 NR/NR Freddie Mac REMICS, 5.5%, 5/15/33 277,049 1,062,714 0.62 NR/NR Freddie Mac REMICS, Floating Rate Note, 1/15/33 1,069,296 268,963 1.17 AAA/NR Freddie Mac REMICS, Floating Rate Note, 10/15/31 274,814 712,431 0.52 NR/NR Freddie Mac REMICS, Floating Rate Note, 11/15/18 713,732 107,303 0.62 NR/NR Freddie Mac REMICS, Floating Rate Note, 11/15/30 107,328 397,495 0.82 NR/NR Freddie Mac REMICS, Floating Rate Note, 11/15/31 401,997 23,777 1.12 NR/NR Freddie Mac REMICS, Floating Rate Note, 11/15/33 23,794 366,641 0.57 NR/NR Freddie Mac REMICS, Floating Rate Note, 11/15/35 367,861 354,822 0.62 NR/NR Freddie Mac REMICS, Floating Rate Note, 12/15/20 357,068 806,670 0.67 NR/NR Freddie Mac REMICS, Floating Rate Note, 12/15/28 812,967 106,430 0.67 NR/NR Freddie Mac REMICS, Floating Rate Note, 12/15/32 106,708 78,370 0.72 NR/NR Freddie Mac REMICS, Floating Rate Note, 12/15/32 78,987 972,448 0.57 NR/NR Freddie Mac REMICS, Floating Rate Note, 12/15/41 975,063 546,289 0.45 NR/NR Freddie Mac REMICS, Floating Rate Note, 2/15/19 547,573 193,819 0.57 NR/NR Freddie Mac REMICS, Floating Rate Note, 2/15/29 194,798 1,034,468 0.77 NR/NR Freddie Mac REMICS, Floating Rate Note, 2/15/33 1,042,504 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 41 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Government -- (continued) 147,435 0.52 NR/NR Freddie Mac REMICS, Floating Rate Note, 2/15/39 $ 147,631 303,392 0.92 NR/NR Freddie Mac REMICS, Floating Rate Note, 3/15/32 307,508 993,485 0.52 NR/NR Freddie Mac REMICS, Floating Rate Note, 3/15/41 995,681 232,073 0.57 NR/NR Freddie Mac REMICS, Floating Rate Note, 5/15/29 232,453 491,470 1.73 NR/NR Freddie Mac REMICS, Floating Rate Note, 5/15/33 504,158 1,139,787 0.56 NR/NR Freddie Mac REMICS, Floating Rate Note, 5/15/37 1,142,841 258,769 0.57 NR/NR Freddie Mac REMICS, Floating Rate Note, 5/15/41 259,625 559,295 0.67 NR/NR Freddie Mac REMICS, Floating Rate Note, 6/15/23 562,331 1,239,303 0.62 NR/NR Freddie Mac REMICS, Floating Rate Note, 6/15/33 1,243,428 778,694 0.53 NR/NR Freddie Mac REMICS, Floating Rate Note, 6/15/36 780,521 653,485 0.47 NR/NR Freddie Mac REMICS, Floating Rate Note, 7/15/21 654,340 243,957 0.72 NR/NR Freddie Mac REMICS, Floating Rate Note, 7/15/36 245,397 162,302 0.62 NR/NR Freddie Mac REMICS, Floating Rate Note, 7/15/36 162,945 1,625,516 0.42 NR/NR Freddie Mac REMICS, Floating Rate Note, 7/15/36 1,624,519 644,754 0.82 NR/NR Freddie Mac REMICS, Floating Rate Note, 9/15/32 650,702 120,888 0.64 NR/NR Freddie Mac REMICS, Floating Rate Note, 9/15/36 121,481 660,889 0.62 NR/NR Freddie Mac REMICS, Floating Rate Note, 9/15/36 664,098 408,854 NR/NR Government National Mortgage Association, 4.5%, 6/20/27 408,617 56,836 NR/NR Government National Mortgage Association, 4.75%, 6/20/38 56,982 952,136 0.47 NR/NR Government National Mortgage Association, Floating Rate Note, 1/20/33 954,716 2,485,400 0.62 NR/NR Government National Mortgage Association, Floating Rate Note, 5/16/38 2,500,767 361,632 0.72 NR/NR Government National Mortgage Association, Floating Rate Note, 6/16/31 365,299 The accompanying notes are an integral part of these financial statements. 42 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Government -- (continued) 161,285 0.87 NR/NR Government National Mortgage Association, Floating Rate Note, 7/20/40 $ 161,417 203,148 0.72 NR/NR Government National Mortgage Association, Floating Rate Note, 8/20/38 205,151 1,230,910 0.47 NR/NR Government National Mortgage Association, Floating Rate Note, 9/16/31 1,239,274 ------------- $ 60,043,047 ------------- Total Government $ 60,043,047 ------------------------------------------------------------------------------------------------------ TOTAL COLLATERALIZED MORTGAGE OBLIGATIONS (Cost $194,827,350) $196,989,123 ------------------------------------------------------------------------------------------------------ CORPORATE BONDS -- 18.2% ENERGY -- 0.0%+ Oil & Gas Exploration & Production -- 0.0%+ 150,000 A/Aa3 Ras Laffan Liquefied Natural Gas Co., Ltd., III, 4.5%, 9/30/12 (144A) $ 150,000 ------------- Total Energy $ 150,000 ------------------------------------------------------------------------------------------------------ CAPITAL GOODS -- 0.2% Aerospace & Defense -- 0.1% 570,000 0.69 A/A2 United Technologies Corp., Floating Rate Note, 12/2/13 $ 572,295 ------------------------------------------------------------------------------------------------------ Industrial Conglomerates -- 0.1% 625,000 BBB/Baa2 Tyco Electronics Group SA, 6.0%, 10/1/12 $ 625,000 ------------- Total Capital Goods $ 1,197,295 ------------------------------------------------------------------------------------------------------ TRANSPORTATION -- 0.3% Railroads -- 0.3% 2,357,000 BBB/Baa3 CSX Corp., 5.75%, 3/15/13 $ 2,412,653 ------------- Total Transportation $ 2,412,653 ------------------------------------------------------------------------------------------------------ AUTOMOBILES & COMPONENTS -- 0.7% Auto Parts & Equipment -- 0.2% 1,205,000 0.85 BBB+/Baa1 Johnson Controls, Inc., Floating Rate Note, 2/4/14 $ 1,209,667 ------------------------------------------------------------------------------------------------------ Automobile Manufacturers -- 0.5% 200,000 0.83 A/A2 BMW US Capital LLC, Floating Rate Note, 12/21/12 $ 200,200 1,250,000 0.97 A-/A3 Daimler Finance North America LLC, Floating Rate Note, 3/28/14 (144A) 1,252,361 300,000 1.24 A-/A3 Daimler Finance North America LLC, Floating Rate Note, 4/10/14 (144A) 301,046 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 43 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Automobile Manufacturers -- (continued) 300,000 1.79 A-/A3 Daimler Finance North America LLC, Floating Rate Note, 7/11/13 (144A) $ 302,227 250,000 BBB+/A3 Nissan Motor Acceptance Corp., 3.25%, 1/30/13 (144A) 251,780 790,000 A-/A3 Volkswagen International Finance NV, 1.625%, 8/12/13 (144A) 797,750 300,000 1.13 A-/A3 Volkswagen International Finance NV, Floating Rate Note, 3/21/14 (144A) 301,605 ------------- $ 3,406,969 ------------- Total Automobiles & Components $ 4,616,636 ------------------------------------------------------------------------------------------------------ FOOD, BEVERAGE & TOBACCO -- 1.0% Brewers -- 0.4% 600,000 A/A3 Anheuser-Busch InBev Worldwide, Inc., 2.5%, 3/26/13 $ 605,927 1,318,000 A/A3 Anheuser-Busch InBev Worldwide, Inc., 3.0%, 10/15/12 1,319,127 620,000 1.10 A/A3 Anheuser-Busch InBev Worldwide, Inc., Floating Rate Note, 3/26/13 622,349 ------------- $ 2,547,403 ------------------------------------------------------------------------------------------------------ Packaged Foods & Meats -- 0.6% 1,500,000 0.74 BBB+/A2 Campbell Soup Co., Floating Rate Note, 8/1/14 $ 1,506,926 3,025,000 BBB-/Baa2 Kraft Foods, Inc., 6.0%, 2/11/13 3,082,127 ------------- $ 4,589,053 ------------- Total Food, Beverage & Tobacco $ 7,136,456 ------------------------------------------------------------------------------------------------------ HEALTH CARE EQUIPMENT & SERVICES -- 0.3% Health Care Equipment -- 0.3% 1,780,000 A/Baa1 Covidien International Finance SA, 1.875%, 6/15/13 $ 1,797,403 500,000 A/Baa1 St Jude Medical, Inc., 2.2%, 9/15/13 507,171 ------------- $ 2,304,574 ------------- Total Health Care Equipment & Services $ 2,304,574 ------------------------------------------------------------------------------------------------------ PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 0.2% Pharmaceuticals -- 0.0%+ 150,000 AA/A1 Abbott Laboratories, Inc., 5.15%, 11/30/12 $ 151,152 ------------------------------------------------------------------------------------------------------ Life Sciences Tools & Services -- 0.2% 1,450,000 BBB+/Baa2 Agilent Technologies, Inc., 2.5%, 7/15/13 $ 1,469,476 ------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 1,620,628 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 44 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ BANKS -- 3.3% Diversified Banks -- 1.9% 250,000 2.44 A/Aa3 Banco Santander Chile SA, Floating Rate Note, 2/14/14 (144A) $ 246,322 250,000 AA-/Aa1 Bank of Nova Scotia, Inc., 2.25%, 1/22/13 251,508 250,000 1.50 AA-/Aa1 Bank of Nova Scotia, Inc., Floating Rate Note, 1/12/15 253,619 400,000 0.65 AA/Aa2 Cooperatieve Centrale Raiffeisen-Boerenleenbank BA Netherlands, Floating Rate Note, 7/25/13 400,303 1,745,000 1.26 AA-/Aa3 HSBC Bank Plc, Floating Rate Note, 1/17/14 (144A) 1,754,016 300,000 0.86 AA-/Aa3 HSBC Bank Plc, Floating Rate Note, 1/18/13 (144A) 300,362 305,000 A-/A3 HSBC Holdings Plc, 5.25%, 12/12/12 307,679 200,000 1.15 AA-/Aa3 Royal Bank of Canada, Inc., Floating Rate Note, 10/30/14 201,907 560,000 0.56 AA-/Aa3 Royal Bank of Canada, Inc., Floating Rate Note, 3/8/13 560,367 1,000,000 0.76 AA-/Aa3 Royal Bank of Canada, Inc., Floating Rate Note, 4/17/14 1,003,112 250,000 A/Aa3 The Korea Development Bank, Ltd., 5.5%, 11/13/12 251,174 1,500,000 0.89 AA-/Aaa The Toronto-Dominion Bank, Inc., Floating Rate Note, 11/1/13 1,507,496 200,000 0.76 AA-/Aaa The Toronto-Dominion Bank, Inc., Floating Rate Note, 7/14/14 200,963 128,000 0.79 A/A3 Wachovia Corp., Floating Rate Note, 10/28/15 125,477 1,725,000 2.21 A+/A2 Wachovia Corp., Floating Rate Note, 5/1/13 1,742,471 100,000 0.63 A+/A2 Wachovia Corp., Floating Rate Note, 8/1/13 100,074 820,000 A+/A2 Wells Fargo & Co., 5.25%, 10/23/12 822,354 1,500,000 1.29 A+/A2 Wells Fargo & Co., Floating Rate Note, 6/26/15 1,511,277 365,000 1.14 AA-/Aa2 Westpac Banking Corp., Floating Rate Note, 12/9/13 367,136 500,000 1.26 NR/Aaa Westpac Banking Corp., Floating Rate Note, 7/17/15 (144A) 504,144 1,000,000 0.67 AA-/Aa2 Westpac Banking Corp., Floating Rate Note, 9/27/13 999,906 ------------- $ 13,411,667 ------------------------------------------------------------------------------------------------------ Regional Banks -- 1.2% 1,660,000 A-/A2 American Express Bank FSB, 5.5%, 4/16/13 $ 1,705,230 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 45 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Regional Banks -- (continued) 250,000 A-/A2 American Express Bank FSB, 5.55%, 10/17/12 $ 250,509 400,000 A-/A2 American Express Centurion Bank, Inc., 5.55%, 10/17/12 400,797 200,000 BBB+/A3 BB&T Corp., 4.75%, 10/1/12 200,000 400,000 1.15 A-/A2 BB&T Corp., Floating Rate Note, 4/28/14 402,472 2,450,000 BBB/Baa1 Fifth Third Bancorp, 6.25%, 5/1/13 2,529,289 500,000 BBB-/Baa2 First Tennessee Bank NA, 4.625%, 5/15/13 509,529 1,541,000 BBB+/Baa1 KeyCorp, 6.5%, 5/14/13 1,595,639 100,000 0.65 A-/A3 PNC Funding Corp., Floating Rate Note, 1/31/14 99,838 350,000 0.61 A+/Aa3 State Street Bank and Trust Co., Floating Rate Note, 12/8/15 342,875 450,000 5.38 BBB+/Baa1 State Street Capital Trust III, Floating Rate Note, 1/29/49 (Perpetual) 450,058 125,000 0.74 A+/Aa3 US Bank NA Cincinnati Ohio, Floating Rate Note, 10/14/14 124,710 ------------- $ 8,610,946 ------------------------------------------------------------------------------------------------------ Thrifts & Mortgage Finance -- 0.2% 1,220,000 0.81 AAA/Aaa Swedbank Hypotek AB, Floating Rate Note, 3/28/14 (144A) $ 1,218,165 ------------- Total Banks $ 23,240,778 ------------------------------------------------------------------------------------------------------ DIVERSIFIED FINANCIALS -- 7.1% Other Diversified Financial Services -- 4.1% 300,000 6.50 BB+/NR Caelus Re II, Ltd., Floating Rate Note, 5/24/13 (Cat Bond) (144A) $ 306,900 1,495,000 A-/Baa2 Citigroup, Inc., 5.5%, 4/11/13 1,531,578 1,000,000 1.28 A-/Baa2 Citigroup, Inc., Floating Rate Note, 2/15/13 1,001,955 2,942,000 2.44 A-/Baa2 Citigroup, Inc., Floating Rate Note, 8/13/13 2,981,323 250,000 9.00 BB-/NR Compass Re, Ltd., Floating Rate Note, 1/8/15 (Cat Bond) (144A) 256,750 1,000,000 10.25 BB-/NR Compass Re, Ltd., Floating Rate Note, 1/8/15 (Cat Bond) (144A) 1,035,100 250,000 11.25 B+/NR Compass Re, Ltd., Floating Rate Note, 1/8/15 (Cat Bond) (144A) 257,925 250,000 9.00 BB/NR East Lane Re V, Ltd., Floating Rate Note, 3/16/16 (Cat Bond) (144A) 268,225 520,000 6.71 BB-/NR Embarcadero Reinsurance, Ltd., Floating Rate Note, 8/4/14 (Cat Bond) (144A) 522,392 525,000 0.00 BB+/NR Embarcadero Reinsurance, Ltd., Floating Rate Note, 8/7/15 (Cat Bond) (144A) 528,622 The accompanying notes are an integral part of these financial statements. 46 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Other Diversified Financial Services -- (continued) 300,000 1.31 AA+/A1 General Electric Capital Corp., Floating Rate Note, 1/7/14 $ 300,937 200,000 1.15 AA+/A1 General Electric Capital Corp., Floating Rate Note, 4/24/14 201,285 372,000 1.09 AA+/A1 General Electric Capital Corp., Floating Rate Note, 4/7/14 373,617 365,000 1.33 AA+/A1 General Electric Capital Corp., Floating Rate Note, 5/22/13 367,036 500,000 1.49 AA+/A1 General Electric Capital Corp., Floating Rate Note, 7/2/15 503,783 500,000 1.38 AA+/A1 General Electric Capital Corp., Floating Rate Note, 8/1/17 498,054 1,645,000 1.37 AA+/A1 General Electric Capital Corp., Floating Rate Note, 9/23/13 1,658,278 300,000 8.35 BB-/NR Ibis Re II, Ltd., Floating Rate Note, 2/5/15 (Cat Bond) (144A) 308,640 1,000,000 6.20 BB-/NR Ibis Re, Ltd., Floating Rate Note, 5/3/13 (Cat Bond) (144A) 1,021,900 1,250,000 1.25 A/A2 JPMorgan Chase & Co., Floating Rate Note, 1/24/14 1,258,175 1,875,000 1.08 A/A2 JPMorgan Chase & Co., Floating Rate Note, 2/26/13 1,880,696 250,000 6.00 BB/NR Lodestone Re, Ltd., Floating Rate Note, 1/8/14 (Cat Bond) (144A) 250,400 1,000,000 7.25 BB/NR Lodestone Re, Ltd., Floating Rate Note, 1/8/14 (Cat Bond) (144A) 1,009,400 500,000 6.25 BB/NR Lodestone Re, Ltd., Floating Rate Note, 5/17/13 (Cat Bond) (144A) 505,550 1,600,000 8.25 BB-/NR Lodestone Re, Ltd., Floating Rate Note, 5/17/13 (Cat Bond) (144A) 1,629,920 600,000 9.98 BB-/NR Loma Reinsurance, Ltd., Floating Rate Note, 12/21/12 (Cat Bond) (144A) 602,880 500,000 7.50 BB-/NR Queen Street II Capital, Ltd., Floating Rate Note, 4/9/14 (Cat Bond) (144A) 502,050 500,000 7.50 BB-/NR Queen Street IV Capital, Ltd., Floating Rate Note, 4/9/15 (Cat Bond) (144A) 491,700 250,000 8.50 B+/NR Queen Street V Re, Ltd., Floating Rate Note, 4/9/15 (Cat Bond) (144A) 250,850 1,000,000 6.25 BB/NR Residential Reinsurance 2010, Ltd., Floating Rate Note, 6/6/13 (Cat Bond) (144A) 1,021,400 1,000,000 0.00 BB/NR Residential Reinsurance 2010, Ltd., Floating Rate Note, 6/6/13 (Cat Bond) (144A) 1,023,800 500,000 9.00 BB-/NR Residential Reinsurance 2011, Ltd., Floating Rate Note, 6/6/15 (Cat Bond) (144A) 512,000 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 47 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Other Diversified Financial Services -- (continued) 250,000 10.00 BB-/NR Residential Reinsurance 2012, Ltd., Floating Rate Note, 6/6/16 (Cat Bond) (144A) $ 262,525 750,000 8.00 BB-/NR Residential Reinsurance 2012, Ltd., Floating Rate Note, 6/6/16 (Cat Bond) (144A) 762,675 400,000 3.33 BBB-/NR Vita Capital IV, Ltd., Floating Rate Note, 1/15/16 (Cat Bond) (144A) 401,560 1,500,000 3.12 BBB-/NR Vita Capital V, Ltd., Floating Rate Note, 1/15/17 (Cat Bond) (144A) 1,499,700 500,000 3.82 BB+/NR Vita Capital V, Ltd., Floating Rate Note, 1/15/17 (Cat Bond) (144A) 500,050 ------------- $ 28,289,631 ------------------------------------------------------------------------------------------------------ Specialized Finance -- 0.3% 750,000 5.25 BB+/NR Kibou, Ltd., Floating Rate Note, 2/16/15 (Cat Bond) (144A) $ 763,200 1,500,000 NR/Aaa Private Export Funding Corp., 4.974%, 8/15/13 1,562,370 ------------- $ 2,325,570 ------------------------------------------------------------------------------------------------------ Consumer Finance -- 1.7% 1,370,000 BBB+/A3 American Express Co., 4.875%, 7/15/13 $ 1,416,531 265,000 A-/A2 American Express Credit Corp., 5.875%, 5/2/13 273,319 100,000 1.92 A-/A2 American Express Credit Corp., Floating Rate Note, 6/19/13 100,995 775,000 1.22 A-/A2 American Express Credit Corp., Floating Rate Note, 6/24/14 783,182 200,000 0.68 A+/A1 American Honda Finance Corp., Floating Rate Note, 11/20/12 (144A) 200,017 300,000 0.81 A+/A1 American Honda Finance Corp., Floating Rate Note, 11/7/12 (144A) 300,106 1,500,000 0.79 A+/A1 American Honda Finance Corp., Floating Rate Note, 6/18/14 (144A) 1,502,636 550,000 1.04 A+/A1 American Honda Finance Corp., Floating Rate Note, 8/5/13 (144A) 552,313 1,050,000 BBB/Baa1 Capital One Bank USA NA, 6.5%, 6/13/13 1,091,756 242,000 1.61 BBB/Baa1 Capital One Financial Corp., Floating Rate Note, 7/15/14 243,695 897,000 0.70 A/A2 John Deere Capital Corp., Floating Rate Note, 4/25/14 898,814 1,000,000 0.68 A+/A1 PACCAR Financial Corp., Floating Rate Note, 4/5/13 1,002,277 250,000 0.66 A+/A1 PACCAR Financial Corp., Floating Rate Note, 6/5/14 250,632 The accompanying notes are an integral part of these financial statements. 48 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Consumer Finance -- (continued) 554,000 AA-/Aa3 Toyota Motor Credit Corp., 1.25%, 11/17/14 $ 562,288 1,015,000 0.91 AA-/Aa3 Toyota Motor Credit Corp., Floating Rate Note, 10/11/13 1,019,150 1,200,000 0.66 AA-/Aa3 Toyota Motor Credit Corp., Floating Rate Note, 10/12/12 1,200,115 500,000 0.70 AA-/Aa3 Toyota Motor Credit Corp., Floating Rate Note, 4/23/13 500,610 ------------- $ 11,898,436 ------------------------------------------------------------------------------------------------------ Asset Management & Custody Banks -- 0.3% 100,000 A+/Aa3 The Bank of New York Mellon Corp., 4.5%, 4/1/13 $ 102,049 200,000 A+/Aa3 The Bank of New York Mellon Corp., 4.95%, 11/1/12 200,781 1,300,000 0.72 A+/Aa3 The Bank of New York Mellon Corp., Floating Rate Note, 1/31/14 1,303,892 200,000 0.72 A+/Aa3 The Bank of New York Mellon Corp., Floating Rate Note, 7/28/14 200,419 ------------- $ 1,807,141 ------------------------------------------------------------------------------------------------------ Investment Banking & Brokerage -- 0.7% 1,295,000 A-/Baa2 Merrill Lynch & Co, Inc., 6.15%, 4/25/13 $ 1,333,315 900,000 A-/Baa2 Merrill Lynch & Co., Inc., 5.45%, 2/5/13 913,752 250,000 2.05 A-/Baa1 Morgan Stanley Co., Floating Rate Note, 1/24/14 250,837 50,000 1.43 A-/Baa1 Morgan Stanley Co., Floating Rate Note, 4/29/13 50,056 100,000 2.94 A-/Baa1 Morgan Stanley Co., Floating Rate Note, 5/14/13 100,985 500,000 4.75 B+/NR Queen Street III Capital, Ltd., Floating Rate Note, 7/28/14 (Cat Bond) (144A) 495,800 410,000 A/Baa1 TD Ameritrade Holding Corp., 2.95%, 12/1/12 411,687 400,000 1.17 A/A2 The Bear Stearns Companies LLC, Floating Rate Note, 10/28/14 400,037 100,000 A-/A3 The Goldman Sachs Group, Inc., 5.45%, 11/1/12 100,392 200,000 1.44 A-/A3 The Goldman Sachs Group, Inc., Floating Rate Note, 2/7/14 199,898 1,000,000 0.82 A-/A3 The Goldman Sachs Group, Inc., Floating Rate Note, 3/22/16 961,112 ------------- $ 5,217,871 ------------- Total Diversified Financials $ 49,538,649 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 49 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ INSURANCE -- 3.2% Life & Health Insurance -- 1.1% 3,180,000 A+/A1 Allstate Life Global Funding Trusts, 5.375%, 4/30/13 $ 3,272,312 135,000 A-/A3 MetLife, Inc., 5.375%, 12/15/12 136,364 600,000 1.69 A-/A3 MetLife, Inc., Floating Rate Note, 8/6/13 605,743 1,800,000 A-/Baa2 Protective Life Corp., 4.3%, 6/1/13 1,841,852 305,000 A/Baa2 Prudential Financial, Inc., 2.75%, 1/14/13 306,975 500,000 0.71 BBB+/Baa1 Sun Life Financial Global Funding III LP, Floating Rate Note, 10/6/13 (144A) 496,450 1,000,000 4.71 BBB+/NR Vitality Re, Ltd., Floating Rate Note, 1/7/14 (Cat Bond) (144A) 1,021,400 ------------- $ 7,681,096 ------------------------------------------------------------------------------------------------------ Multi-line Insurance -- 0.4% 1,725,000 AA-/Aa3 Metropolitan Life Global Funding, Inc., 2.5%, 1/11/13 (144A) $ 1,734,465 330,000 AA-/Aa3 Metropolitan Life Global Funding, Inc., 5.125%, 4/10/13 (144A) 337,951 680,000 1.21 AA-/Aa3 Metropolitan Life Global Funding, Inc., Floating Rate Note, 1/10/14 (144A) 683,684 ------------- $ 2,756,100 ------------------------------------------------------------------------------------------------------ Reinsurance -- 1.7% 600,000 6.41 BB+/NR Blue Danube, Ltd., Floating Rate Note, 4/10/15 (Cat Bond) (144A) $ 623,580 625,000 11.16 BB-/NR Blue Danube, Ltd., Floating Rate Note, 4/10/15 (Cat Bond) (144A) 670,062 500,000 14.00 B-/NR Blue Fin, Ltd., Floating Rate Note, 5/28/13 (Cat Bond) (144A) 519,000 500,000 4.50 NR/Baa1 Combine Re, Ltd., Floating Rate Note, 1/7/15 (Cat Bond) (144A) 512,800 900,000 5.00 BB+/NR Foundation Re III, Ltd., Floating Rate Note, 2/25/15 (Cat Bond) 912,510 250,000 5.75 BB/NR Foundation Re III, Ltd., Floating Rate Note, 2/3/14 (Cat Bond) (144A) 252,800 750,000 3.75 BB+/NR Golden State Re, Ltd., Floating Rate Note, 1/8/15 (Cat Bond) (144A) 757,500 500,000 7.75 BB-/NR Lakeside Re II, Ltd., Floating Rate Note, 1/8/13 (Cat Bond) (144A) 501,650 1,000,000 5.40 BB+/NR Longpoint Re, Ltd., Floating Rate Note, 12/24/12 (Cat Bond) (144A) 1,004,800 750,000 6.00 BB+/NR Longpoint Re, Ltd., Floating Rate Note, 6/12/15 (Cat Bond) (144A) 787,725 500,000 3.21 BB+/NR Midori, Ltd., Floating Rate Note, 10/24/12 (Cat Bond) (144A) 500,000 500,000 10.16 B/NR Montana Re, Ltd., Floating Rate Note, 12/7/12 (Cat Bond) (144A) 502,950 The accompanying notes are an integral part of these financial statements. 50 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Reinsurance -- (continued) 1,000,000 11.50 B/NR MultiCat Mexico 2009, Ltd., Floating Rate Note, 10/19/12 (Cat Bond) (144A) $ 1,000,300 465,000 10.25 B/NR MultiCat Mexico 2009, Ltd., Floating Rate Note, 10/19/12 (Cat Bond) (144A) 462,536 500,000 10.25 B/NR MultiCat Mexico 2009, Ltd., Floating Rate Note, 10/19/12 (Cat Bond) (144A) 497,350 250,000 9.00 BB/NR Mystic Re, Ltd., Floating Rate Note, 3/12/15 (Cat Bond) (144A) 259,750 1,000,000 8.41 NR/Ba3 Mythen, Ltd., Floating Rate Note, 5/7/15 (Cat Bond) (144A) 1,070,700 500,000 13.75 NR/NR Pelican Re, Ltd., Floating Rate Note, 4/13/15 (Cat Bond) (144A) 500,600 250,000 10.35 B/NR Queen Street VI Re, Ltd., Floating Rate Note, 4/9/15 (Cat Bond) (144A) 253,500 500,000 9.66 B/NR Successor X, Ltd., Floating Rate Note, 2/25/14 (Cat Bond) (144A) 503,450 ------------- $ 12,093,563 ------------- Total Insurance $ 22,530,759 ------------------------------------------------------------------------------------------------------ TECHNOLOGY HARDWARE & EQUIPMENT -- 0.1% Office Electronics -- 0.1% 550,000 1.80 BBB-/Baa2 Xerox Corp., Floating Rate Note, 9/13/13 $ 553,632 ------------- Total Technology Hardware & Equipment $ 553,632 ------------------------------------------------------------------------------------------------------ TELECOMMUNICATION SERVICES -- 0.4% Integrated Telecommunication Services -- 0.4% 1,376,000 BBB/Baa2 British Telecommunications Plc, 5.15%, 1/15/13 $ 1,393,902 600,000 1.50 BBB/Baa2 British Telecommunications Plc, Floating Rate Note, 12/20/13 603,948 500,000 BBB/Baa2 Telecom Italia Capital SA, 5.25%, 11/15/13 515,625 200,000 0.77 BBB/Baa2 Telefonica Emisiones SAU, Floating Rate Note, 2/4/13 199,303 ------------- $ 2,712,778 ------------- Total Telecommunication Services $ 2,712,778 ------------------------------------------------------------------------------------------------------ UTILITIES -- 1.4% Electric Utilities -- 0.8% 1,341,000 BBB/Baa2 Duke Energy Corp., 5.65%, 6/15/13 $ 1,388,887 1,175,000 BBB+/Baa2 Northeast Utilities Co., 5.65%, 6/1/13 1,214,153 1,505,000 1.13 BBB+/Baa2 Northeast Utilities Co., Floating Rate Note, 9/20/13 1,513,908 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 51 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Electric Utilities -- (continued) 250,000 A-/A2 NSTAR Electric Co., 4.875%, 10/15/12 $ 250,372 385,000 A-/A1 Peco Energy Co., 4.75%, 10/1/12 385,000 300,000 A/A2 Public Service Co., of Colorado, 4.875%, 3/1/13 305,538 125,000 A/A2 Public Service Co., of Colorado, 7.875%, 10/1/12 125,000 ------------- $ 5,182,858 ------------------------------------------------------------------------------------------------------ Multi-Utilities -- 0.5% 1,900,000 A-/Baa2 Dominion Resources, Inc., Virginia, 5.0%, 3/15/13 $ 1,938,587 1,495,000 1.15 BBB+/Baa1 Sempra Energy Co., Floating Rate Note, 3/15/14 1,501,596 ------------- $ 3,440,183 ------------------------------------------------------------------------------------------------------ Independent Power Producers & Energy Traders -- 0.1% 500,000 6.65 BB/NR East Lane Re, Ltd., Floating Rate Note, 3/13/15 (Cat Bond) (144A) $ 527,250 250,000 5.75 BB+/NR East Lane Re, Ltd., Floating Rate Note, 3/14/14 (Cat Bond) (144A) 258,100 ------------- $ 785,350 ------------- Total Utilities $ 9,408,391 ------------------------------------------------------------------------------------------------------ TOTAL CORPORATE BONDS (Cost $126,799,724) $127,423,229 ------------------------------------------------------------------------------------------------------ U.S. GOVERNMENT AND AGENCY OBLIGATIONS -- 7.5% 8,894 AAA/Aaa Fannie Mae, 6.5%, 1/1/15 $ 9,353 16,286 AAA/Aaa Fannie Mae, 7.0%, 10/1/17 17,476 34,396 3.36 AAA/Aaa Fannie Mae, Floating Rate Note, 1/1/48 37,075 30,523 2.54 AAA/Aaa Fannie Mae, Floating Rate Note, 10/1/32 32,752 21,325 2.27 AAA/Aaa Fannie Mae, Floating Rate Note, 11/1/23 22,193 33,632 2.30 AAA/Aaa Fannie Mae, Floating Rate Note, 2/1/34 34,372 12,094 2.52 AAA/Aaa Fannie Mae, Floating Rate Note, 4/1/15 12,233 27,252 2.31 AAA/Aaa Fannie Mae, Floating Rate Note, 9/1/32 29,025 500,000 AA+/Aaa Federal Farm Credit Banks, 0.875%, 6/14/16 501,620 100,000 0.28 AA+/Aaa Federal Farm Credit Banks, Floating Rate Note, 10/15/13 100,069 3,000,000 0.20 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 1/15/14 3,001,044 The accompanying notes are an integral part of these financial statements. 52 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ U.S. Government and Agency Obligations -- (continued) 500,000 0.24 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 1/25/13 $ 500,229 1,000,000 0.17 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 11/15/13 1,000,024 300,000 0.29 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 2/25/13 300,224 1,250,000 0.21 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 3/11/14 1,250,415 440,000 0.27 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 3/13/13 440,322 670,000 0.14 AA+/NR Federal Home Loan Banks, Floating Rate Note, 4/12/13 669,929 300,000 0.34 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 4/5/13 300,255 450,000 0.27 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 5/2/13 450,394 2,500,000 0.32 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 6/7/13 2,502,388 5,515,000 0.27 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 7/22/13 5,518,451 3,675,000 0.24 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 8/1/13 3,677,914 485,000 0.38 AA+/Aaa Federal Home Loan Banks, Floating Rate Note, 9/16/13 485,800 7,873 AAA/Aaa Federal Home Loan Mortgage Corp., 7.0%, 6/1/14 8,261 3,450,000 0.28 AA+/Aaa Federal Home Loan Mortgage Corp., Floating Rate Note, 1/10/13 3,451,780 3,865,000 0.31 AA+/Aaa Federal Home Loan Mortgage Corp., Floating Rate Note, 1/24/13 3,867,006 15,222 2.34 AAA/Aaa Federal Home Loan Mortgage Corp., Floating Rate Note, 10/1/23 16,216 3,000,000 0.28 AA+/Aaa Federal Home Loan Mortgage Corp., Floating Rate Note, 10/12/12 3,000,126 16,906 2.86 AAA/Aaa Federal Home Loan Mortgage Corp., Floating Rate Note, 11/1/33 18,057 4,240,000 0.39 AA+/Aaa Federal Home Loan Mortgage Corp., Floating Rate Note, 11/18/13 4,250,558 9,220 4.60 AAA/Aaa Federal Home Loan Mortgage Corp., Floating Rate Note, 6/1/35 9,854 2,020,000 0.30 AA+/Aaa Federal Home Loan Mortgage Corp., Floating Rate Note, 8/12/13 2,022,648 2,000,000 0.35 AA+/Aaa Federal National Mortgage Association, Floating Rate Note, 10/25/13 2,003,934 5,270,000 0.29 AA+/Aaa Federal National Mortgage Association, Floating Rate Note, 11/23/12 5,271,570 4,480,000 0.29 AA+/Aaa Federal National Mortgage Association, Floating Rate Note, 12/3/12 4,481,581 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 53 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ U.S. Government and Agency Obligations -- (continued) 1,240,000 0.27 AA+/Aaa Federal National Mortgage Association, Floating Rate Note, 3/14/13 $ 1,240,629 18,501 1.62 AAA/Aaa Government National Mortgage Association II, Floating Rate Note, 1/20/22 19,264 541,960 AA+/Aaa U.S. Treasury Inflation Indexed Bonds, 0.625%, 4/15/13 547,125 250,000 AA+/Aaa U.S. Treasury Notes, 0.5%, 11/30/12 250,156 750,000 AA+/Aaa U.S. Treasury Notes, 0.625%, 12/31/12 750,879 ------------- $ 52,103,201 ------------------------------------------------------------------------------------------------------ TOTAL U.S. GOVERNMENT AND AGENCY OBLIGATIONS (Cost $52,086,293) $ 52,103,201 ------------------------------------------------------------------------------------------------------ MUNICIPAL BONDS -- 1.8% Municipal Development -- 0.6% 4,365,000 0.19 NR/Aa1 Mississippi Business Finance Corp., Floating Rate Note, 12/1/30 $ 4,365,000 ------------------------------------------------------------------------------------------------------ Municipal General -- 0.2% 200,000 1.39 A+/A1 New Jersey Economic Development Authority, Floating Rate Note, 6/15/13 $ 200,566 1,000,000 NR/NR State of California, 2.5%, 6/20/13 1,014,806 ------------- $ 1,215,372 ------------------------------------------------------------------------------------------------------ Municipal Housing -- 0.0%+ 500,000 AA-/Aa3 Massachusetts Housing Finance Agency, 0.467%, 6/1/13 $ 500,000 ------------------------------------------------------------------------------------------------------ Municipal Medical -- 0.6% 4,000,000 0.20 AA/NR Harris County Health Facilities Development Corp., Floating Rate Note, 12/1/41 $ 4,000,000 ------------------------------------------------------------------------------------------------------ Municipal Power -- 0.2% 1,000,000 0.93 NR/Aa3 South Carolina State Public Service Authority, Floating Rate Note, 6/2/14 $ 1,001,600 250,000 0.73 NR/Aa3 South Carolina State Public Service Authority, Floating Rate Note, 7/1/13 250,340 ------------- $ 1,251,940 ------------------------------------------------------------------------------------------------------ Municipal Student Loan -- 0.2% 1,250,000 1.00 AA+/NR Louisiana Public Facilities Authority, Floating Rate Note, 4/26/27 $ 1,262,200 ------------------------------------------------------------------------------------------------------ TOTAL MUNICIPAL BONDS (Cost $12,592,011) $ 12,594,512 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 54 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ SENIOR FLOATING RATE LOAN INTERESTS -- 6.8%** ENERGY -- 0.1% Integrated Oil & Gas -- 0.0%+ 68,197 4.50 BBB/Baa2 Glenn Pool Oil & Gas Trust, Term Loan, 6/1/16 $ 68,538 ------------------------------------------------------------------------------------------------------ Oil & Gas Refining & Marketing -- 0.0%+ 100,000 4.25 BB/Ba2 Pilot Travel Centers LLC, Initial Tranche B Term Loan, 3/7/18 $ 100,500 ------------------------------------------------------------------------------------------------------ Oil & Gas Storage & Transportation -- 0.1% 223,875 4.75 BB-/Ba3 Gibson Energy, Inc., Tranche B Term Loan, 6/30/18 $ 225,974 ------------- Total Energy $ 395,012 ------------------------------------------------------------------------------------------------------ MATERIALS -- 0.5% Commodity Chemicals -- 0.2% 197,205 5.25 BB-/B1 Taminco Global Chemical Corp., Tranche B-1 Dollar Term Loan, 2/15/19 $ 199,670 705,375 4.25 NR/Ba2 Tronox, Inc., Closing Date Term Loan, 1/24/17 712,429 192,375 4.25 NR/Ba2 Tronox, Inc., Delayed Draw Term Loan, 1/24/17 194,299 ------------- $ 1,106,398 ------------------------------------------------------------------------------------------------------ Specialty Chemicals -- 0.2% 92,500 3.75 BB+/Baa3 Ashland, Inc., Term B Loan, 5/31/18 $ 93,299 750,000 0.00 BB+/NR Chemtura Corp., Term Loan, 8/27/16 750,000 198,000 5.75 BB-/Ba2 OM Group, Inc., Term B Dollar Loan, 7/5/17 199,361 124,063 5.00 BB-/Ba1 PolyOne Corp., Term Loan, 9/30/17 125,187 ------------- $ 1,167,847 ------------------------------------------------------------------------------------------------------ Paper Packaging -- 0.0%+ 49,375 6.50 B/B2 Exopack Holding Corp., Term Loan B, 5/6/17 $ 49,210 147,000 4.75 BB/Ba1 Sealed Air Corp., Term B Advance, 5/31/18 148,168 ------------- $ 197,378 ------------------------------------------------------------------------------------------------------ Aluminum -- 0.0%+ 119,400 5.75 BB-/Ba2 Noranda Aluminum Holding Corp., Term B Loan, 2/17/19 $ 120,930 ------------------------------------------------------------------------------------------------------ Diversified Metals & Mining -- 0.0%+ 148,125 4.00 BB+/Ba1 SunCoke Energy, Inc., Tranche B Term Loan, 7/21/18 $ 148,866 ------------------------------------------------------------------------------------------------------ Precious Metals & Minerals -- 0.1% 459,677 5.25 BB-/B1 Fairmount Minerals, Ltd., Tranche B Term Loan, 3/1/17 $ 459,333 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 55 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Steel -- 0.0%+ 149,244 4.75 BB/B1 JMC Steel Group, Term Loan, 2/15/17 $ 150,270 ------------- Total Materials $ 3,351,022 ------------------------------------------------------------------------------------------------------ CAPITAL GOODS -- 0.5% Aerospace & Defense -- 0.1% 173,688 5.75 BB+/Ba3 DigitalGlobe, Inc., Term Loan, 9/21/18 $ 174,701 348,250 3.75 BBB-/Ba1 Spirit Aerosystems, Inc., Term B Loan, 3/27/19 350,499 ------------- $ 525,200 ------------------------------------------------------------------------------------------------------ Electrical Components & Equipment -- 0.1% 900,000 6.00 BB-/Ba2 WireCo WorldGroup, Inc., Term Loan, 4/13/17 $ 910,125 ------------------------------------------------------------------------------------------------------ Construction & Farm Machinery & Heavy Trucks -- 0.0%+ 148,500 5.50 BB/Ba2 Terex Corp., U.S. Term Loan, 4/28/17 $ 149,242 225,000 4.25 BB/Ba2 The Manitowoc Co., Inc., Term B Loan, 10/11/17 226,744 ------------- $ 375,986 ------------------------------------------------------------------------------------------------------ Industrial Machinery -- 0.1% 482,581 6.00 NR/NR Schaeffler AG, Facility C2 Term Loan, 1/27/17 $ 487,406 84,416 6.25 BB-/Ba2 Xerium Technologies, Inc., Initial U.S. Term Loan, 5/4/17 83,502 ------------- $ 570,908 ------------------------------------------------------------------------------------------------------ Trading Companies & Distributors -- 0.2% 500,000 5.75 BBB-/Ba2 AWAS Aviation Capital, Ltd., Term Loan, 6/25/18 $ 503,750 600,000 6.75 BBB-/B1 Fly Leasing, Ltd., Loan, 7/17/18 600,250 ------------- $ 1,104,000 ------------- Total Capital Goods $ 3,486,219 ------------------------------------------------------------------------------------------------------ COMMERCIAL SERVICES & SUPPLIES -- 0.2% Environmental & Facilities Services -- 0.0%+ 199,000 4.00 BB+/Ba1 Covanta Holding Corp., Term Loan, 3/1/19 $ 199,995 196,257 4.75 B+/B1 Waste Industries USA, Inc., Term B Loan, 2/23/17 197,484 ------------- $ 397,479 ------------------------------------------------------------------------------------------------------ Office Services & Supplies -- 0.0%+ 139,300 4.25 BB+/Ba1 ACCO Brands Corp., Term B Loan, 1/4/19 $ 140,475 ------------------------------------------------------------------------------------------------------ Diversified Support Services -- 0.1% 523,671 5.25 B+/Ba3 Allied Security Holdings LLC, Term Loan (First Lien), 1/21/17 $ 525,635 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 56 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Human Resource & Employment Services -- 0.1% 684,460 5.00 BB-/Ba3 On Assignment, Inc., Initial Term B Loan, 3/20/19 $ 686,599 ------------- Total Commercial Services & Supplies $ 1,750,188 ------------------------------------------------------------------------------------------------------ TRANSPORTATION -- 0.1% Railroads -- 0.0%+ 248,750 4.00 BB+/B1 RailAmerica, Inc., Initial Loan, 2/15/19 $ 248,905 ------------------------------------------------------------------------------------------------------ Trucking -- 0.1% 211,607 3.98 BB/B1 Swift Transportation Co., Tranche B-1 Term Loan, 12/21/16 $ 212,665 500,000 5.00 BB/B1 Swift Transportation Co., Tranche B-2 Term Loan, 12/15/17 503,334 ------------- $ 715,999 ------------- Total Transportation $ 964,904 ------------------------------------------------------------------------------------------------------ AUTOMOBILES & COMPONENTS -- 0.3% Auto Parts & Equipment -- 0.3% 1,006,368 3.50 BBB/Baa2 Delphi Automotive LLP, Tranche B Term Loan, 3/31/17 $ 1,011,269 647,997 6.75 NR/NR TI Group Automotive Systems LLC, Term Loan, 3/1/19 642,732 98,562 4.25 BB/Ba2 Tomkins LLC, Term B-1 Loan, 9/21/16 99,277 ------------- $ 1,753,278 ------------------------------------------------------------------------------------------------------ Tires & Rubber -- 0.0%+ 250,000 4.75 BB/Ba1 The Goodyear Tire & Rubber Co., Loan (Second Lien), 3/27/19 $ 252,604 ------------- Total Automobiles & Components $ 2,005,882 ------------------------------------------------------------------------------------------------------ CONSUMER DURABLES & APPAREL -- 0.2% Housewares & Specialties -- 0.0%+ 192,614 5.25 BB-/Ba3 Prestige Brands, Inc., Term B Loan, 12/20/18 $ 194,849 278,600 5.25 B+/B1 Yankee Candle Co., Inc., Initial Term Loan, 3/2/19 281,647 ------------- $ 476,496 ------------------------------------------------------------------------------------------------------ Footwear -- 0.1% 475,000 0.00 NR/Ba2 Wolverine World Wide, Inc., Term Loan, 5/1/19 $ 481,234 ------------------------------------------------------------------------------------------------------ Textiles -- 0.1% 698,250 6.75 NR/Ba3 Kloeckner Pentaplast SA, Term B-1 Loan, 12/14/16 $ 704,360 ------------- Total Consumer Durables & Apparel $ 1,662,090 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 57 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ CONSUMER SERVICES -- 0.7% Casinos & Gaming -- 0.1% 98,536 4.00 BB+/Ba2 Ameristar Casinos, Inc., B Term Loan, 3/29/18 $ 99,187 134,750 6.00 BB-/Ba3 Boyd Gaming Corp., Increased Term Loan, 12/17/15 136,659 409,875 3.75 BBB-/Ba1 Penn National Gaming, Inc., Term B Facility, 6/29/18 412,149 189,050 4.00 BB+/Ba1 Pinnacle Entertainment, Inc., Series A Term Loan, 3/5/19 190,350 98,346 2.98 BBB-/Ba1 Scientific Games Corp., Tranche B-1 Term Loan, 6/30/15 98,346 ------------- $ 936,691 ------------------------------------------------------------------------------------------------------ Leisure Facilities -- 0.1% 800,000 4.25 BB+/B1 Six Flags Entertainment Corp., Tranche B Term Loan, 11/23/18 $ 805,997 ------------------------------------------------------------------------------------------------------ Restaurants -- 0.4% 137,275 4.30 BB-/Ba2 DineEquity, Inc., Term B-1 Loan, 10/31/17 $ 138,442 498,747 6.50 B+/B1 Landry's, Inc., B Term Loan, 3/22/18 506,353 159,200 5.25 NR/NR NPC International, Inc., Term Loan 2012, 12/28/18 161,190 475,000 6.25 B+/Ba3 PF Chang's China Bistro, Inc., Term Borrowing, 5/15/19 480,344 1,055,000 0.00 BB-/B1 Wendy's International, Inc., Term Loan, 4/3/19 1,065,715 ------------- $ 2,352,044 ------------------------------------------------------------------------------------------------------ Education Services -- 0.1% 298,500 5.25 BB-/Ba2 Bright Horizons Family Solutions, Inc., Tranche C Term Loan, 5/1/17 $ 299,246 ------------------------------------------------------------------------------------------------------ Specialized Consumer Services -- 0.0%+ 174,125 5.50 B/Ba3 Ascent Capital Group, Inc., Term Loan, 3/6/18 $ 176,410 ------------- Total Consumer Services $ 4,570,388 ------------------------------------------------------------------------------------------------------ MEDIA -- 0.7% Broadcasting -- 0.3% 248,750 4.00 BB-/Ba2 Cequel Communications Holdings I LLC and Cequel Capital Corp., Term Loan, 1/31/19 $ 250,072 136,687 6.25 BB-/Ba3 Entercom Communications Corp., Term B Loan, 11/7/18 137,729 750,000 4.00 BB-/Ba3 MCC Georgia LLC, Tranche G Term, 2/8/20 746,250 397,478 4.00 BB+/Ba1 Sinclair Broadcast Group, Inc., New Tranche B Term Loan, 10/29/16 400,293 The accompanying notes are an integral part of these financial statements. 58 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Broadcasting -- (continued) 374,063 4.25 NR/Ba3 Telesat Canada, U.S. Term B Loan, 3/28/19 $ 375,465 98,318 4.25 BB-/Ba3 TWCC Holding Corp., Term Loan, 1/24/17 99,075 349,125 6.75 B+/Ba3 Wolverine Healthcare Analytics, Inc., Tranche B Term Loan, 5/25/19 352,180 ------------- $ 2,361,064 ------------------------------------------------------------------------------------------------------ Cable & Satellite -- 0.2% 373,125 4.00 BB+/Ba1 Charter Communications Operating LLC, Term D Loan, 3/28/19 $ 375,597 650,000 4.25 NR/NR Kabel Deutschland Vertrieb und Service GmbH, Facility F, 2/1/19 651,915 ------------- $ 1,027,512 ------------------------------------------------------------------------------------------------------ Movies & Entertainment -- 0.2% 572,184 4.75 BB-/Ba2 AMC Entertainment, Inc., Term B-3 Loan, 2/7/18 $ 576,532 497,478 4.50 BB-/Ba2 Live Nation Entertainment, Inc., Term B Loan, 10/20/16 499,546 ------------- $ 1,076,078 ------------------------------------------------------------------------------------------------------ Publishing -- 0.0%+ 144,552 4.50 BB-/Ba3 Interactive Data Corp., Term B Loan, 1/31/18 $ 145,545 ------------- Total Media $ 4,610,199 ------------------------------------------------------------------------------------------------------ RETAILING -- 0.2% Apparel Retail -- 0.1% 399,000 4.75 BB+/Ba2 Ascena Retail Group, Inc., Tranche B Term Loan, 5/17/18 $ 402,658 59,511 5.75 BB/Ba3 Lord & Taylor LLC, Term Loan, 12/2/18 60,032 ------------- $ 462,690 ------------------------------------------------------------------------------------------------------ Automotive Retail -- 0.1% 548,622 0.00 BB/Ba1 Avis Budget Car Rental LLC, 8/7/19 $ 555,479 84,589 6.25 BB/Ba1 Avis Budget Car Rental LLC, Tranche B Term Loan, 6/13/18 85,012 ------------- $ 640,491 ------------- Total Retailing $ 1,103,181 ------------------------------------------------------------------------------------------------------ FOOD, BEVERAGE & TOBACCO -- 0.1% Packaged Foods & Meats -- 0.1% 498,750 0.00 NR/NR Acosta, Inc., Term D Loan, 9/25/17 $ 501,867 74,438 4.50 BB/Ba2 B&G Foods, Inc., Tranche B Term Loan, 10/28/18 75,228 ------------- $ 577,095 ------------- Total Food, Beverage & Tobacco $ 577,095 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 59 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ HOUSEHOLD & PERSONAL PRODUCTS -- 0.1% Personal Products -- 0.1% 498,737 4.75 BB-/Ba3 Revlon, Inc., Term Loan B, 11/19/17 $ 501,621 ------------- Total Household & Personal Products $ 501,621 ------------------------------------------------------------------------------------------------------ HEALTH CARE EQUIPMENT & SERVICES -- 1.0% Health Care Equipment -- 0.2% 1,150,000 0.00 BBB-/Ba2 Hologic, Inc., Tranche B Term Loan, 4/29/19 $ 1,164,950 74,438 7.00 BB-/Ba2 Kinetic Concepts, Inc., Dollar Term B-1 Loan, 1/12/18 75,601 ------------- $ 1,240,551 ------------------------------------------------------------------------------------------------------ Health Care Supplies -- 0.0%+ 222,754 5.75 BB-/NR Immucor, Inc., Term B-1 Loan, 8/19/18 $ 225,910 ------------------------------------------------------------------------------------------------------ Health Care Services -- 0.3% 600,000 6.00 B+/Ba3 BSN Medical GmbH & Co KG, Facility B1, 6/11/19 $ 604,750 750,000 0.00 BB-/Ba2 DaVita, Inc., Tranche B-2 Term Loan, 8/1/19 752,812 123,438 6.75 B+/B1 inVentiv Health, Inc., Term B-3 Loan, 6/24/18 120,043 750,000 6.75 NR/Ba3 MModal, Inc., Term B Loan, 7/2/19 742,969 ------------- $ 2,220,574 ------------------------------------------------------------------------------------------------------ Health Care Facilities -- 0.3% 146,843 6.50 B/B1 Ardent Medical Services, Inc., Term Loan, 9/15/15 $ 147,577 74,438 4.50 BB-/Ba3 Health Management Associates, Inc., Term B Loan, 11/1/18 75,099 498,734 5.00 B/Ba3 IASIS Healthcare LLC, Term B Loan, 4/18/18 500,916 997,500 5.50 BB/Ba3 Select Medical Corp., Series A Tranche B Term Loan, 6/1/18 1,006,228 98,750 5.50 BB-/Ba3 Select Medical Holdings Corp., Tranche B Term Loan, 4/25/18 99,429 ------------- $ 1,829,249 ------------------------------------------------------------------------------------------------------ Health Care Technology -- 0.2% 750,000 0.00 NR/NR Convatec, Inc., Dollar Term Loan, 12/22/16 $ 753,371 647,685 5.00 BB-/Ba3 Emdeon, Inc., Term B-1 Loan, 11/2/18 653,352 79,533 5.25 BB-/Ba3 MedAssets, Inc., Term Loan, 11/15/16 80,262 ------------- $ 1,486,985 ------------- Total Health Care Equipment & Services $ 7,003,269 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 60 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 0.6% Biotechnology -- 0.3% 750,000 0.00 BB/B1 Alkermes, Inc., 2019 Term Loan, 9/25/19 $ 754,688 98,496 5.50 BB/B2 Axcan Intermediate Holdings, Inc., Term B-1 Loan, 1/25/17 98,496 820,552 4.50 BB+/Ba2 Grifols, Inc., New U.S. Tranche B Term Loan, 6/4/17 828,963 110,663 0.00 BBB-/Ba3 Warner Chilcott Corp., Additional Term B-1 Loan, 3/15/18 110,967 291,402 0.00 BBB-/Ba3 Warner Chilcott Corp., Term B-1 Loan, 3/3/18 292,204 145,701 0.00 BBB-/Ba3 Warner Chilcott Corp., Term B-2 Loan, 3/17/18 146,102 200,339 0.00 BBB-/Ba3 WC Luxco Sarl, Term B-3 Loan, 3/3/18 200,890 ------------- $ 2,432,310 ------------------------------------------------------------------------------------------------------ Pharmaceuticals -- 0.3% 22,936 4.00 BBB-/Ba1 Endo Health Solutions, Inc., Term Loan B 2011, 4/14/18 $ 23,039 750,000 0.00 NR/B1 Par Pharmaceutical Companies, Inc., Term Loan, 8/2/19 749,812 600,000 0.00 BBB-/Ba1 Valeant Pharmaceuticals International, Inc., Term Loan, 9/12/19 601,650 497,500 4.75 BBB-/Ba1 Valeant Pharmaceuticals International, Inc., Tranche B Term Loan, 2/13/19 501,439 ------------- $ 1,875,940 ------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 4,308,250 ------------------------------------------------------------------------------------------------------ DIVERSIFIED FINANCIALS -- 0.4% Other Diversified Financial Services -- 0.3% 537,571 7.50 B+/B2 Preferred Sands Holding Co., LLC, Term B Loan, 12/15/16 $ 512,036 545,721 4.00 BBB-/Baa2 RPI Finance Trust, 6.75 Year Term Loan, 4/13/18 547,767 648,049 4.00 BBB-/Baa2 RPI Finance Trust, New Term Loan, 11/9/18 653,180 98,939 5.25 NR/Ba2 WorldPay, Facility B2A Term Loan, 8/6/17 99,620 ------------- $ 1,812,603 ------------------------------------------------------------------------------------------------------ Specialized Finance -- 0.1% 747,497 4.75 B+/Ba3 Pinnacle Foods Finance LLC, Tranche E Term Loan, 9/16/18 $ 749,988 ------------- Total Diversified Financials $ 2,562,591 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 61 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ INSURANCE -- 0.1% Life & Health Insurance -- 0.1% 124,688 5.75 B+/Ba2 AmWINS Group, Inc., Term Loan, 5/7/19 $ 125,155 500,000 0.00 NR/Ba3 CNO Financial Group, Inc., Term Loan, 9/4/18 502,395 ------------- $ 627,550 ------------- Total Insurance $ 627,550 ------------------------------------------------------------------------------------------------------ SOFTWARE & SERVICES -- 0.4% IT Consulting & Other Services -- 0.1% 1,000,000 4.50 BB/Ba3 Booz Allen Hamilton Holding Corp., Initial Tranche B Term Loan, 7/10/19 $ 1,006,979 ------------------------------------------------------------------------------------------------------ Data Processing & Outsourced Services -- 0.2% 1,000,000 4.25 NR/NR Genpact, Ltd., Term Loan, 8/17/19 $ 1,004,375 99,000 5.00 BB+/Ba2 NeuStar, Inc., Term Advance Loan, 10/11/18 99,990 225,059 4.25 BB/Ba3 VeriFone Systems, Inc., Term B Loan, 11/14/18 225,762 ------------- $ 1,330,127 ------------------------------------------------------------------------------------------------------ Application Software -- 0.0%+ 92,221 7.50 CCC+/B1 Allen Systems Group, Inc., Term B Loan, 11/22/15 $ 88,417 ------------------------------------------------------------------------------------------------------ Systems Software -- 0.1% 667,897 4.00 NR/Ba2 Rovi Corp., Tranche B2 Term Loan, 3/30/19 $ 646,190 ------------- Total Software & Services $ 3,071,713 ------------------------------------------------------------------------------------------------------ TECHNOLOGY HARDWARE & EQUIPMENT -- 0.0%+ Communications Equipment -- 0.0%+ 249,367 4.25 NR/NR CommScope, Inc., Tranche 1 Term Loan, 1/14/18 $ 251,004 ------------- Total Technology Hardware & Equipment $ 251,004 ------------------------------------------------------------------------------------------------------ SEMICONDUCTORS & SEMICONDUCTOR EQUIPMENT -- 0.1% Semiconductor Equipment -- 0.0%+ 133,728 5.75 BB-/B1 Aeroflex, Inc., Tranche B Term Loan, 4/25/18 $ 133,645 98,750 4.00 BB+/Ba2 Sensata Technologies BV, Term Loan, 4/29/18 99,422 ------------- $ 233,067 ------------------------------------------------------------------------------------------------------ Semiconductors -- 0.1% 315,639 4.00 BB/Ba2 Microsemi Corp., Term Loan, 2/2/18 $ 318,006 488,775 4.25 BBB-/Ba2 Semtech Corp., B Term Loan, 2/21/17 492,746 ------------- $ 810,752 ------------- Total Semiconductors & Semiconductor Equipment $ 1,043,819 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 62 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ TELECOMMUNICATION SERVICES -- 0.3% Integrated Telecommunication Services -- 0.3% 1,172,063 5.75 B+/Ba3 West Corp., Term B-6 Loan, 8/1/18 $ 1,184,516 723,188 4.00 BB+/Baa3 Windstream Corp., Tranche B-3 Term Loan, 7/23/19 727,400 ------------- $ 1,911,916 ------------------------------------------------------------------------------------------------------ Wireless Telecommunication Services -- 0.0%+ 123,750 4.50 NR/NR Cellular South, Inc., Term Loan, 6/16/17 $ 124,833 124,063 4.00 B+/Ba3 Crown Castle International Corp., Tranche B Term Loan, 1/10/19 124,675 ------------- $ 249,508 ------------- Total Telecommunication Services $ 2,161,424 ------------------------------------------------------------------------------------------------------ UTILITIES -- 0.2% Independent Power Producers & Energy Traders -- 0.2% 500,000 0.00 NR/B1 Calpine Corp., Term Loan 2012, 9/27/19 $ 497,500 895,725 4.00 BB+/Baa3 NRG Energy, Inc., Term Loan, 5/5/18 901,659 347,867 4.25 BB+/Ba1 The AES Corp., Initial Term Loan, 5/17/18 350,228 ------------- $ 1,749,387 ------------- Total Utilities $ 1,749,387 ------------------------------------------------------------------------------------------------------ TOTAL SENIOR FLOATING RATE LOAN INTERESTS (Cost $47,163,441) $ 47,756,808 ------------------------------------------------------------------------------------------------------ TEMPORARY CASH INVESTMENTS -- 1.2% Certificates of Deposit -- 1.2% 140,000 0.76 AA-/Aa1 Bank of Nova Scotia Houston, Floating Rate Note, 10/18/12 $ 140,040 100,000 0.75 AA-/NR Bank of Nova Scotia Houston, Floating Rate Note, 2/15/13 100,192 2,500,000 0.71 NR/NR Bank of Nova Scotia Houston, Floating Rate Note, 7/19/13 2,504,660 1,000,000 0.74 NR/NR Bank of Nova Scotia Houston, Floating Rate Note, 9/17/13 1,003,754 2,000,000 1.14 AA-/Aa2 Commonwealth Bank of Australia New York NY, Floating Rate Note, 6/14/13 2,010,708 250,000 0.86 AA-/Aa3 Nordea Bank Finland Plc New York, Floating Rate Note, 3/8/13 250,299 300,000 0.90 AA-/NR Nordea Bank Finland Plc New York, Floating Rate Note, 4/5/13 300,438 1,000,000 0.56 AA-/Aa3 Royal Bank of Canada New York NY, Floating Rate Note, 10/5/12 1,000,039 250,000 0.48 AA-/Aaa Toronto-Dominion Bank New York, Floating Rate Note, 10/19/12 250,000 The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 63 Schedule of Investments | 9/30/12 (unaudited) (continued) ------------------------------------------------------------------------------------------------------ Principal Floating S&P/Moody's Amount ($) Rate (b) Ratings Value ------------------------------------------------------------------------------------------------------ Certificates of Deposit -- (continued) 750,000 0.31 NR/NR Toronto-Dominion Bank New York, Floating Rate Note, 5/15/13 $ 750,000 250,000 1.21 NR/NR Westpac Banking Corp., New York, Floating Rate Note, 7/10/13 251,354 ------------- $ 8,561,484 ------------------------------------------------------------------------------------------------------ TOTAL TEMPORARY CASH INVESTMENTS (Cost $8,556,510) $ 8,561,484 ------------------------------------------------------------------------------------------------------ TOTAL INVESTMENT IN SECURITIES -- 90.0% (Cost $624,509,705) (a) $ 628,892,595 ------------------------------------------------------------------------------------------------------ OTHER ASSETS & LIABILITIES -- 10.0% $ 69,771,951 ------------------------------------------------------------------------------------------------------ TOTAL NET ASSETS -- 100.0% $ 698,664,546 ====================================================================================================== NR Not rated by either S&P or Moody's. WR Security rating withdrawn by either S&P or Moody's. (Perpetual) Security with no stated maturity date. (Step) Bond issued with an initial coupon rate which converts to a higher rate at a later date. REIT's Real Estate Investment Trust. + Amount 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 September 28, 2012, the value of these securities amounted to $191,798,127 or 27.5% of total net assets. ** Senior floating rate loan interests in which the Fund invests generally pay interest at rates that are periodically redetermined by reference to a base lending rate plus a premium. These base lending rates are generally (i) the lending rate offered by one or more major European banks, such as LIBOR (London InterBank Offered Rate), (ii) the prime rate offered by one or more major U.S. banks, (iii) the certificate of deposit or (iv) other base lending rates used by commercial lenders. The rate shown is the coupon rate at period end. (a) At September 30, 2012, the net unrealized gain on investments based on cost for federal income tax purposes of $624,736,950 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $ 4,997,346 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (841,701) ------------- Net unrealized gain $ 4,155,645 ============= (b) Debt obligation with a variable interest rate. Rate shown is rate at end of period. Purchases and sales of securities (excluding temporary cash investments) for the six months ended September 30, 2012 aggregated $681,880,496 and $128,522,334, respectively. The accompanying notes are an integral part of these financial statements. 64 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. Level 1 - quoted prices in active markets for identical securities Level 2 - other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.) Level 3 - significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) Generally, equity securities are categorized as Level 1, fixed income securities and senior loans as Level 2 and securities using fair value methods are categorized as Level 3. See Notes to Financial Statements -- Note 1A. The following is a summary of the inputs used as of September 30, 2012, in valuing the Fund's assets: -------------------------------------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total -------------------------------------------------------------------------------------------------------------- Asset Backed Securities $ -- $ 183,464,238 $ -- $ 183,464,238 Collateralized Mortgage Obligations -- 196,989,123 -- 196,989,123 Corporate Bonds -- 127,423,229 -- 127,423,229 U.S. Government and Agency Obligations -- 52,103,201 -- 52,103,201 Municipal Bonds -- 12,594,512 -- 12,594,512 Senior Floating Rate Loan Interests -- 47,756,808 -- 47,756,808 Temporary Cash Investments -- 8,561,484 -- 8,561,484 -------------------------------------------------------------------------------------------------------------- Total $ -- $ 628,892,595 $ -- $ 628,892,595 -------------------------------------------------------------------------------------------------------------- Other Financial Instruments* $ (450) $ -- $ -- $ (450) ============================================================================================================== * Other financial instruments include futures contracts. The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 65 Statement of Assets and Liabilities | 9/30/12 (unaudited) ASSETS: Investment in securities (cost $624,509,705) $628,892,595 Cash 52,953,252 Futures collateral 1,100 Receivables -- Investment securities sold 2,333,897 Fund shares sold 32,153,258 Interest 1,435,309 Other 88,668 -------------------------------------------------------------------------------------------------------------- Total assets $717,858,079 -------------------------------------------------------------------------------------------------------------- LIABILITIES: Payables -- Investment securities purchased $ 15,202,973 Fund shares repurchased 3,804,719 Variation margin 250 Dividends 128,024 Due to affiliates 19,703 Accrued expenses 37,864 -------------------------------------------------------------------------------------------------------------- Total liabilities $ 19,193,533 -------------------------------------------------------------------------------------------------------------- NET ASSETS: Paid-in capital $694,674,115 Distributions in excess of net investment income (930,252) Accumulated net realized gain on investments and futures contracts 538,243 Net unrealized gain on investments 4,382,890 Net unrealized loss on futures contracts (450) -------------------------------------------------------------------------------------------------------------- Total net assets $698,664,546 ============================================================================================================== NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Class A (based on $206,971,134/20,519,394 shares) $ 10.09 Class C (based on $133,963,960/13,296,209 shares) $ 10.08 Class Y (based on $357,729,452/35,433,119 shares) $ 10.10 MAXIMUM OFFERING PRICE: Class A ($10.09 (divided by) 97.5%) $ 10.35 ============================================================================================================== The accompanying notes are an integral part of these financial statements. 66 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 Statement of Operations (unaudited) For the Six Months Ended 9/30/12 INVESTMENT INCOME: Interest $2,927,996 -------------------------------------------------------------------------------------------------------------- Total investment income $ 2,927,996 -------------------------------------------------------------------------------------------------------------- EXPENSES: Management fees $ 631,108 Transfer agent fees and expenses Class A 5,844 Class C 2,242 Class Y 2,736 Distribution fees Class A 114,476 Class C 132,017 Administrative reimbursement 50,717 Shareholder communication expense 17,307 Custodian fees 12,775 Registration fees 27,005 Professional fees 32,745 Printing expense 12,138 Fees and expenses of nonaffiliated Trustees 3,786 Miscellaneous 9,590 -------------------------------------------------------------------------------------------------------------- Total expenses $ 1,054,486 -------------------------------------------------------------------------------------------------------------- Net expenses $ 1,054,486 -------------------------------------------------------------------------------------------------------------- Net investment income $ 1,873,510 -------------------------------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS AND FUTURES CONTRACTS: Net realized gain (loss) on: Investments $ 539,714 Futures contracts (755) $ 538,959 -------------------------------------------------------------------------------------------------------------- Change in net unrealized gain (loss) on: Investments $3,961,871 Futures contracts (1,138) $3,960,733 -------------------------------------------------------------------------------------------------------------- Net gain on investments and futures contracts $ 4,499,692 -------------------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 6,373,202 ============================================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 67 Statements of Changes in Net Assets ----------------------------------------------------------------------------------------------------------------------------- Six Months 5/2/11 Ended (Commencement 9/30/12 of Operations) (unaudited) to 3/31/12 ----------------------------------------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income $ 1,873,510 $ 846,905 Net realized gain (loss) on investments, futures contracts, and foreign currency transactions 538,959 (7,898) Change in net unrealized gain on investments, futures contracts, and foreign currency transactions 3,960,733 421,707 ----------------------------------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 6,373,202 $ 1,260,714 ----------------------------------------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Net investment income: Class A ($0.08 and $0.13 per share, respectively) $ (825,660) $ (293,801) Class C ($0.05 and $0.06 per share, respectively) (223,292) (54,609) Class Y ($0.09 and $0.15 per share, respectively) (1,676,994) (583,991) ----------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (2,725,946) $ (932,401) ----------------------------------------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sale of shares $ 657,795,159 $ 202,547,654 Reinvestment of distributions 2,158,861 542,255 Cost of shares repurchased (124,271,854) (44,083,098) ----------------------------------------------------------------------------------------------------------------------------- Net increase in net assets resulting from Fund share transactions $ 535,682,166 $ 159,006,811 ----------------------------------------------------------------------------------------------------------------------------- Net increase in net assets $ 539,329,422 $ 159,335,124 NET ASSETS: Beginning of period 159,335,124 -- ----------------------------------------------------------------------------------------------------------------------------- End of period $ 698,664,546 $ 159,335,124 ----------------------------------------------------------------------------------------------------------------------------- Distributions in excess of net investment income $ (930,252) $ (77,816) ----------------------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 68 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 ----------------------------------------------------------------------------------------------------------------------------- 9/12 Shares 9/12 Amount (unaudited) (unaudited) '12 Shares '12 Amount ----------------------------------------------------------------------------------------------------------------------------- Class A Shares sold 19,447,727 $195,179,188 5,368,452 $ 52,712,709 Reinvestment of distributions 76,392 767,389 23,987 239,674 Less shares repurchased (3,810,002) (38,266,575) (587,162) (5,869,255) ----------------------------------------------------------------------------------------------------------------------------- Net increase 15,714,117 $157,680,002 4,805,277 $ 47,083,128 ============================================================================================================================= Class C Shares sold 13,809,205 $138,590,248 1,684,145 $ 15,038,604 Reinvestment of distributions 20,498 206,016 3,580 35,733 Less shares repurchased (1,695,850) (17,005,773) (525,369) (5,240,717) ----------------------------------------------------------------------------------------------------------------------------- Net increase 12,133,853 $121,790,491 1,162,356 $ 9,833,620 ============================================================================================================================= Class Y Shares sold 32,256,663 $324,025,723 13,195,493 $134,796,341 Reinvestment of distributions 117,878 1,185,456 26,678 266,848 Less shares repurchased (6,865,162) (68,999,506) (3,298,431) (32,973,126) ----------------------------------------------------------------------------------------------------------------------------- Net increase 25,509,379 $256,211,673 9,923,740 $102,090,063 ============================================================================================================================= The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 69 Financial Highlights --------------------------------------------------------------------------------------------------------------------------- Six Months 5/2/11 Ended (Commencement 9/30/12 of Operations) (unaudited) to 3/31/12 (a) --------------------------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of period $ 10.02 $ 10.00 --------------------------------------------------------------------------------------------------------------------------- Increase from investment operations: Net investment income $ 0.07 $ 0.12 Net realized and unrealized gain on investments 0.08 0.03 --------------------------------------------------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 0.15 $ 0.15 --------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.08) (0.13) --------------------------------------------------------------------------------------------------------------------------- Net increase in net asset value $ 0.07 $ 0.02 --------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.09 $ 10.02 =========================================================================================================================== Total return* 1.47% 1.48% Ratio of net expenses to average net assets 0.65%** 0.90%** Ratio of net investment income to average net assets 0.97%** 1.45%** Portfolio turnover rate 24%** 51%** Net assets, end of period (in thousands) $206,971 $48,160 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.65%** 1.03%** Net investment income 0.97%** 1.32%** Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.65%** 0.90%** Net investment income 0.97%** 1.44%** =========================================================================================================================== (a) Class A shares were first publicly offered on May 2, 2011. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized. The accompanying notes are an integral part of these financial statements. 70 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 --------------------------------------------------------------------------------------------------------------------------- Six Months 5/2/11 Ended (Commencement 9/30/12 of Operations) (unaudited) to 3/31/12 (a) --------------------------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of period $ 10.02 $ 10.00 --------------------------------------------------------------------------------------------------------------------------- Increase from investment operations: Net investment income $ 0.05 $ 0.05 Net realized and unrealized gain on investments 0.06 0.03 --------------------------------------------------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 0.11 $ 0.08 --------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.05) (0.06) --------------------------------------------------------------------------------------------------------------------------- Net increase in net asset value $ 0.06 $ 0.02 --------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.08 $ 10.02 =========================================================================================================================== Total return* 1.09% 0.82% Ratio of net expenses to average net assets 1.04%** 1.75%** Ratio of net investment income to average net assets 0.54%** 0.52%** Portfolio turnover rate 24%** 51%** Net assets, end of period (in thousands) $133,964 $11,643 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.04%** 1.87%** Net investment income 0.54%** 0.40%** Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.04%** 1.75%** Net investment income 0.54%** 0.52%** ========================================================================================================================== (a) Class C shares were first publicly offered on May 2, 2011. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized. The accompanying notes are an integral part of these financial statements. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 71 Financial Highlights (continued) --------------------------------------------------------------------------------------------------------------------------- Six Months 5/2/11 Ended (Commencement 9/30/12 of Operations) (unaudited) to 3/31/12 (a) --------------------------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 10.03 $ 10.00 --------------------------------------------------------------------------------------------------------------------------- Increase from investment operations: Net investment income $ 0.08 $ 0.14 Net realized and unrealized gain on investments 0.08 0.04 --------------------------------------------------------------------------------------------------------------------------- Net increase in net assets from investment operations $ 0.16 $ 0.18 --------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income (0.09) (0.15) --------------------------------------------------------------------------------------------------------------------------- Net increase in net asset value $ 0.07 $ 0.03 --------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.10 $ 10.03 =========================================================================================================================== Total return* 1.58% 1.79% Ratio of net expenses to average net assets 0.45%** 0.67%** Ratio of net investment income to average net assets 1.19%** 1.72%** Portfolio turnover rate 24%** 51%** Net assets, end of period (in thousands) $357,729 $99,533 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.45%** 0.80%** Net investment income 1.19%** 1.59%** Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.45%** 0.67%** Net investment income 1.19%** 1.72%** =========================================================================================================================== (a) Class Y shares were first publicly offered on May 2, 2011. * 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. 72 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 Notes to Financial Statements | 9/30/12 (unaudited) 1. Organization and Significant Accounting Policies 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 three classes of shares designated as Class A, Class C, and Class Y shares. Class A, Class C and Class Y shares were first publicly Offered on May 2, 2011. 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: Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 73 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. Money market mutual funds are valued at net asset value. Securities or loans for which independent pricing services are unable to supply prices or for which market prices and/or quotations are not readily available or are considered to be unreliable are valued using fair value methods pursuant to procedures adopted by the Board of Trustees. The Fund may use fair value methods if it is determined that a significant event has occurred after the close of the exchange or market on which the security trades and prior to the determination of the Fund's net asset value. Examples of a significant event might include political or economic news, corporate restructurings, natural disasters, terrorist activity or trading halts. Thus, the valuation of the Fund's securities may differ from exchange prices. At September 30, 2012, no securities were valued using fair value methods (other than securities valued using prices supplied by independent pricing services). Inputs used when applying fair value methods to value a security may include credit ratings, the financial condition of the company, current market conditions and comparable securities. 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. 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. 74 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 Gains and losses on sales of investments are calculated on the identified cost method for both financial reporting and federal income tax purposes. B. Foreign Currency Translation The books and records of the Fund are maintained in U.S. dollars. Amounts denominated in foreign currencies are translated into U.S. dollars using current exchange rates. Net realized gains and losses on foreign currency transactions, if any, represent, among other things, the net realized gains and losses on foreign currency contracts, disposition of foreign currencies and the difference between the amount of income accrued and the U.S. dollars actually received. Further, the effects of changes in foreign currency exchange rates on investments are not segregated in the statement of operations from the effects of changes in market price of those securities but are included with the net realized and unrealized gain or loss on investments. C. 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 gains or losses are recorded 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. 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 federal income tax provision is required. As of September 30, 2012, the Fund did not have any interest and penalties related to unrecognized 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 remain subject to examination by federal and state tax authorities. The amounts and characterizations of distributions to shareowners for financial reporting purposes are determined in accordance with federal income tax rules. Therefore, the sources of the Fund's distributions may be shown in the accompanying financial statements as from or in excess of net investment income or as from net realized gain on investment transactions, or as from paid-in capital, depending on the type of book/tax differences that may exist. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 75 The tax character of current year distributions payable will be determined at the end of the current taxable year. The tax character of distributions paid during the year ended March 31, 2012 was as follows: -------------------------------------------------------------------------------- 2012 -------------------------------------------------------------------------------- Distributions paid from: Ordinary income $932,401 -------------------------------------------------------------------------------- Total $932,401 ================================================================================ The following shows the components of distributable earnings on a federal income tax basis at March 31, 2012: -------------------------------------------------------------------------------- 2012 -------------------------------------------------------------------------------- Distributable earnings: Undistributed ordinary income $218,725 Dividends payable (69,324) Net unrealized gain 193,774 -------------------------------------------------------------------------------- Total $345,175 ================================================================================ The difference between book-basis and tax-basis net unrealized gain is attributable to the tax deferral of losses on wash sales, adjustments relating to catastrophe bonds, the mark-to-market of futures contracts 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 $12,791 in underwriting commissions on the sale of Class A shares during the six months ended September 30, 2012. 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). 76 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 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. 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 rates or to seek to increase total return. Futures contracts are types of derivatives. All futures contracts entered into by the Fund are traded on a futures exchange. Upon entering into a futures contract, the Fund is required to deposit with a broker an amount of cash or securities equal to the minimum "initial margin" requirements of the associated futures exchange. Subsequent payments for futures contracts ("variation margin") are paid or received by the Fund, depending on the daily fluctuation in the value of the contracts, and are recorded by the Fund as unrealized gains or losses. When the contract is closed, the Fund realizes a gain or loss equal to the difference between the opening and closing value of the contract as well as any 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 for the six months ended September 30, 2012 was 4. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 77 At September 30, 2012, open futures contracts were as follows: -------------------------------------------------------------------------------- Number of Contracts Settlement Unrealized Type Long/(Short) Month Value Loss -------------------------------------------------------------------------------- U.S. 2 Year Note (CBT) (4) 12/12 $882,125 $(450) -------------------------------------------------------------------------------- Total $(450) ================================================================================ 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. The Fund's investment adviser, Pioneer Investment Management, Inc. (PIM), is responsible for determining that the value of the collateral remains at least equal to the repurchase price. 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 six months ended September 30, 2012, the effective management fee (excluding waivers and/or assumption of expenses) was equivalent to 0.35% of the Fund's average daily net assets. PIM has contractually agreed to limit ordinary operating expenses to the extent required to reduce Fund expenses to 0.85%, 1.15%, 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 six months ended March 31, 2012 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 $37,300 in management fees, administrative costs and certain other reimbursements payable to PIM at September 30, 2012. 78 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 3. Transfer Agent PIMSS, a wholly owned indirect subsidiary of UniCredit, provides substantially all transfer agent and shareowner services to the Fund at negotiated rates. In addition, the Fund reimburses PIMSS for out-of-pocket expenses incurred by PIMSS related to shareholder communications activities such as proxy and statement mailings, outgoing phone calls and omnibus relationship contracts. For the six months ended September 30, 2012, such out-of-pocket expenses by class of shares were as follows: -------------------------------------------------------------------------------- Shareholder Communications: -------------------------------------------------------------------------------- Class A $5,585 Class C 1,676 Class Y 10,046 -------------------------------------------------------------------------------- Total $17,307 ================================================================================ Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $29,136 in transfer agent fees and out-of-pocket reimbursements payable from PIMSS at September 30, 2012. 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 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 $11,539 in distribution fees payable to PFD at September 30, 2012. In addition, redemptions of each class of shares (except Class Y shares) may be subject to a contingent deferred sales charge (CDSC). A CDSC of 1.00% may be imposed on redemptions of certain net asset value purchases of Class A shares within 12 months of purchase. 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 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 79 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 Y shares. Proceeds from the CDSCs are paid to PFD. For the six months ended September 30, 2012, CDSCs of $13,982 were paid to PFD. 5. Expense offset Arrangements The Fund has entered into certain expense offset arrangements with PIMSS, which may result in a reduction in the Fund's total expenses due to interest earned on cash held by PIMSS. For the six months ended September 30, 2012, the Fund's expenses were not reduced under such arrangements. 6. Additional Disclosures about Derivative Instruments and Hedging Activities: Values of derivative instruments as of September 30, 2012 were as follows: -------------------------------------------------------------------------------------------- Derivatives Not Accounted for as Hedging Instruments Asset Derivatives 2012 Liabilities Derivatives 2012 Under Accounting ------------------------------------------------------------ Standards Codification Balance Sheet Balance Sheet (ASC) 815 Location Value Location Value Futures Contracts* Receivables $-- Payables $(450) -------------------------------------------------------------------------------------------- Total $-- $(450) ============================================================================================ * 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 six months ended September 30, 2012 was as follows: -------------------------------------------------------------------------------------------- Derivatives Not Change in Accounted for as Realized unrealized Hedging Instruments Loss on Loss on Under Accounting Location of Gain or (Loss) Derivatives Derivatives Standards Codification on Derivatives Recognized Recognized Recognized (ASC) 815 in Income in Income in Income -------------------------------------------------------------------------------------------- Futures Contracts Net realized loss on futures contracts $(755) Futures Contracts Change in net unrealized loss on $(1,138) futures contracts 80 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 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 until January 20, 2012 was in the amount of $165 million. Under such facility, interest on borrowings was payable at the higher of the London Interbank Offered Rate (LIBOR) on the borrowing date plus 1.25% on an annualized basis or the Federal Funds Rate on the borrowing date plus 1.25% on an annualized basis. The credit facility in effect as of February 15, 2015 is in the amount of $215 million. Under such facility, depending on the type of loan, interest on borrowings is payable at LIBOR plus 0.90% on an annualized basis, or the Alternate Base Rate, which is the greater of (a) the facility's administrative agent's daily announced prime rate on the borrowing date, (b) 2% plus the Federal Funds Rate on the borrowing date and (c) 2% plus the overnight Euro dollar rate on the borrowing date. The Funds pay an annual commitment fee to participate in a credit facility. The commitment fee is allocated among participating Funds based on an allocation schedule set forth in the credit agreement. For the six months ended September 30, 2012, the Fund had no borrowings under a credit facility. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 81 Trustees, Officers and Service Providers Trustees Officers Thomas J. Perna, Chairman John F. Cogan, Jr., President* David R. Bock Daniel K. Kingsbury, Executive John F. Cogan, Jr. Vice President Benjamin M. Friedman Mark E. Bradley, Treasurer** Margaret B.W. Graham Christopher J. Kelley, Secretary Daniel K. Kingsbury Marguerite A. Piret Stephen K. West Investment Adviser and Administrator Pioneer Investment Management, Inc. Custodian and Sub-Administrator Brown Brothers Harriman & Co. Principal Underwriter Pioneer Funds Distributor, Inc. Legal Counsel Bingham McCutchen LLP Shareowner Services and Transfer Agent Pioneer Investment Management Shareholder Services, Inc. Proxy Voting Policies and Procedures of the Fund are available without charge, upon request, by calling our toll free number (1-800-225-6292). Information regarding how the Fund voted proxies relating to portfolio securities during the most recent 12-month period ended June 30 is publicly available to shareowners at us.pioneerinvestments.com. This information is also available on the Securities and Exchange Commission's web site at http://www.sec.gov. * Chief Executive Officer of the Fund ** Chief Financial and Accounting Officer of the Fund 82 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 This page for your notes. Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 83 This page for your notes. 84 Pioneer Multi-Asset Ultrashort Income Fund | Semiannual Report | 9/30/12 How to Contact Pioneer We are pleased to offer a variety of convenient ways for you to contact us for assistance or information. Call us for: -------------------------------------------------------------------------------- Account Information, including existing accounts, new accounts, prospectuses, applications and service forms 1-800-225-6292 FactFone(SM) for automated fund yields, prices, account information and transactions 1-800-225-4321 Retirement plans information 1-800-622-0176 Write to us: -------------------------------------------------------------------------------- PIMSS, Inc. P.O. Box 55014 Boston, Massachusetts 02205-5014 Our toll-free fax 1-800-225-4240 Our internet e-mail address ask.pioneer@pioneerinvestments.com (for general questions about Pioneer only) Visit our web site: us.pioneerinvestments.com This report must be preceded or accompanied by a prospectus. The Fund files a complete schedule of investments with the Securities and Exchange Commission for the first and third quarters for each fiscal year on Form N-Q. Shareholders may view the filed Form N-Q by visiting the Commission's web site at http://www.sec.gov. The filed form may also be viewed and copied at the Commission's Public Reference Room in Washington, DC. Information regarding the operations of the Public Reference Room may be obtained by calling 1-800-SEC-0330. [LOGO] PIONEER Investment(R) Pioneer Investment Management, Inc. 60 State Street Boston, MA 02109 us.pioneerinvestments.com Securities offered through Pioneer Funds Distributor, Inc. 60 State Street, Boston, MA 02109 Underwriter of Pioneer Mutual Funds, Member SIPC (c) 2012 Pioneer Investments 25249-01-1112 ITEM 2. CODE OF ETHICS. (a) Disclose whether, as of the end of the period covered by the report, the registrant has adopted a code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, regardless of whether these individuals are employed by the registrant or a third party. If the registrant has not adopted such a code of ethics, explain why it has not done so. The registrant has adopted, as of the end of the period covered by this report, a code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer and controller. (b) For purposes of this Item, the term "code of ethics" means written standards that are reasonably designed to deter wrongdoing and to promote: (1) Honest and ethical conduct, including the ethical handling of actual or apparent conflicts of interest between personal and professional relationships; (2) Full, fair, accurate, timely, and understandable disclosure in reports and documents that a registrant files with, or submits to, the Commission and in other public communications made by the registrant; (3) Compliance with applicable governmental laws, rules, and regulations; (4) The prompt internal reporting of violations of the code to an appropriate person or persons identified in the code; and (5) Accountability for adherence to the code. (c) The registrant must briefly describe the nature of any amendment, during the period covered by the report, to a provision of its code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, regardless of whether these individuals are employed by the registrant or a third party, and that relates to any element of the code of ethics definition enumerated in paragraph (b) of this Item. The registrant must file a copy of any such amendment as an exhibit pursuant to Item 10(a), unless the registrant has elected to satisfy paragraph (f) of this Item by posting its code of ethics on its website pursuant to paragraph (f)(2) of this Item, or by undertaking to provide its code of ethics to any person without charge, upon request, pursuant to paragraph (f)(3) of this Item. The registrant has made no amendments to the code of ethics during the period covered by this report. (d) If the registrant has, during the period covered by the report, granted a waiver, including an implicit waiver, from a provision of the code of ethics to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, regardless of whether these individuals are employed by the registrant or a third party, that relates to one or more of the items set forth in paragraph (b) of this Item, the registrant must briefly describe the nature of the waiver, the name of the person to whom the waiver was granted, and the date of the waiver. Not applicable. (e) If the registrant intends to satisfy the disclosure requirement under paragraph (c) or (d) of this Item regarding an amendment to, or a waiver from, a provision of its code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions and that relates to any element of the code of ethics definition enumerated in paragraph (b) of this Item by posting such information on its Internet website, disclose the registrant's Internet address and such intention. Not applicable. (f) The registrant must: (1) File with the Commission, pursuant to Item 10(a), a copy of its code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, as an exhibit to its annual report on this Form N-CSR (see attachment); (2) Post the text of such code of ethics on its Internet website and disclose, in its most recent report on this Form N-CSR, its Internet address and the fact that it has posted such code of ethics on its Internet website; or (3) Undertake in its most recent report on this Form N-CSR to provide to any person without charge, upon request, a copy of such code of ethics and explain the manner in which such request may be made. 	See Item 10(2) ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT. (a) (1) Disclose that the registrant's board of trustees has determined that the registrant either: (i) Has at least one audit committee financial expert serving on its audit committee; or (ii) Does not have an audit committee financial expert serving on its audit committee. The registrant's Board of Trustees has determined that the registrant has at least one audit committee financial expert. (2) If the registrant provides the disclosure required by paragraph (a)(1)(i) of this Item, it must disclose the name of the audit committee financial expert and whether that person is "independent." In order to be considered "independent" for purposes of this Item, a member of an audit committee may not, other than in his or her capacity as a member of the audit committee, the board of trustees, or any other board committee: (i) Accept directly or indirectly any consulting, advisory, or other compensatory fee from the issuer; or (ii) Be an "interested person" of the investment company as defined in Section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19)). Ms. Marguerite A. Piret, an independent trustee, is such an audit committee financial expert. (3) If the registrant provides the disclosure required by paragraph (a)(1) (ii) of this Item, it must explain why it does not have an audit committee financial expert. Not applicable. ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES. (a) Disclose, under the caption AUDIT FEES, the aggregate fees billed for each of the last two fiscal years for professional services rendered by the principal accountant for the audit of the registrant's annual financial statements or services that are normally provided by the accountant in connection with statutory and regulatory filings or engagements for those fiscal years. N/A (b) Disclose, under the caption AUDIT-RELATED FEES, the aggregate fees billed in each of the last two fiscal years for assurance and related services by the principal accountant that are reasonably related to the performance of the audit of the registrant's financial statements and are not reported under paragraph (a) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A (c) Disclose, under the caption TAX FEES, the aggregate fees billed in each of the last two fiscal years for professional services rendered by the principal accountant for tax compliance, tax advice, and tax planning. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A (d) Disclose, under the caption ALL OTHER FEES, the aggregate fees billed in each of the last two fiscal years for products and services provided by the principal accountant, other than the services reported in paragraphs (a) through (c) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A (e) (1) Disclose the audit committee's pre-approval policies and procedures described in paragraph (c)(7) of Rule 2-01 of Regulation S-X. PIONEER FUNDS APPROVAL OF AUDIT, AUDIT-RELATED, TAX AND OTHER SERVICES PROVIDED BY THE INDEPENDENT AUDITOR SECTION I - POLICY PURPOSE AND APPLICABILITY The Pioneer Funds recognize the importance of maintaining the independence of their outside auditors. Maintaining independence is a shared responsibility involving Pioneer Investment Management, Inc ("PIM"), the audit committee and the independent auditors. The Funds recognize that a Fund's independent auditors: 1) possess knowledge of the Funds, 2) are able to incorporate certain services into the scope of the audit, thereby avoiding redundant work, cost and disruption of Fund personnel and processes, and 3) have expertise that has value to the Funds. As a result, there are situations where it is desirable to use the Fund's independent auditors for services in addition to the annual audit and where the potential for conflicts of interests are minimal. Consequently, this policy, which is intended to comply with Rule 210.2-01(C)(7), sets forth guidelines and procedures to be followed by the Funds when retaining the independent audit firm to perform audit, audit-related tax and other services under those circumstances, while also maintaining independence. Approval of a service in accordance with this policy for a Fund shall also constitute approval for any other Fund whose pre-approval is required pursuant to Rule 210.2-01(c)(7)(ii). In addition to the procedures set forth in this policy, any non-audit services that may be provided consistently with Rule 210.2-01 may be approved by the Audit Committee itself and any pre-approval that may be waived in accordance with Rule 210.2-01(c)(7)(i)(C) is hereby waived. Selection of a Fund's independent auditors and their compensation shall be determined by the Audit Committee and shall not be subject to this policy. SECTION II - POLICY ---------------- -------------------------------- ------------------------------------------------- SERVICE SERVICE CATEGORY DESCRIPTION SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES CATEGORY ---------------- -------------------------------- ------------------------------------------------- I. AUDIT Services that are directly o Accounting research assistance SERVICES related to performing the o SEC consultation, registration independent audit of the Funds statements, and reporting o Tax accrual related matters o Implementation of new accounting standards o Compliance letters (e.g. rating agency letters) o Regulatory reviews and assistance regarding financial matters o Semi-annual reviews (if requested) o Comfort letters for closed end offerings ---------------- -------------------------------- ------------------------------------------------- II. Services which are not o AICPA attest and agreed-upon procedures AUDIT-RELATED prohibited under Rule o Technology control assessments SERVICES 210.2-01(C)(4) (the "Rule") o Financial reporting control assessments and are related extensions of o Enterprise security architecture the audit services support the assessment audit, or use the knowledge/expertise gained from the audit procedures as a foundation to complete the project. In most cases, if the Audit-Related Services are not performed by the Audit firm, the scope of the Audit Services would likely increase. The Services are typically well-defined and governed by accounting professional standards (AICPA, SEC, etc.) ---------------- -------------------------------- ------------------------------------------------- ------------------------------------- ------------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the audit period for all services and related fees pre-approved specific service reported at each regularly subcategories. Approval of the scheduled Audit Committee independent auditors as meeting. auditors for a Fund shall constitute pre approval for these services. ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the fund fiscal year within services and related fees a specified dollar limit (including comparison to for all pre-approved specified dollar limits) specific service subcategories reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limit for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for Audit-Related Services not denoted as "pre-approved", or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------------------ SECTION III - POLICY DETAIL, CONTINUED ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- --------------------------- ----------------------------------------------- III. TAX SERVICES Services which are not o Tax planning and support prohibited by the Rule, o Tax controversy assistance if an officer of the Fund o Tax compliance, tax returns, excise determines that using the tax returns and support Fund's auditor to provide o Tax opinions these services creates significant synergy in the form of efficiency, minimized disruption, or the ability to maintain a desired level of confidentiality. ----------------------- --------------------------- ----------------------------------------------- ------------------------------------- ------------------------- AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------- ------------------------------------- ------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year all such services and within a specified dollar limit related fees 				 (including comparison 			 to specified dollar 			 limits) reported 			 quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for tax services not denoted as pre-approved, or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------- SECTION III - POLICY DETAIL, CONTINUED ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- --------------------------- ----------------------------------------------- IV. OTHER SERVICES Services which are not o Business Risk Management support prohibited by the Rule, o Other control and regulatory A. SYNERGISTIC, if an officer of the Fund compliance projects UNIQUE QUALIFICATIONS determines that using the Fund's auditor to provide these services creates significant synergy in the form of efficiency, minimized disruption, the ability to maintain a desired level of confidentiality, or where the Fund's auditors posses unique or superior qualifications to provide these services, resulting in superior value and results for the Fund. ----------------------- --------------------------- ----------------------------------------------- --------------------------------------- ------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- -------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year within all such services and a specified dollar limit related fees 			 (including comparison 			 to specified dollar 				 limits) reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for "Synergistic" or "Unique Qualifications" Other Services not denoted as pre-approved to the left, or to add a specific service subcategory as "pre-approved" ------------------------------------- -------------------------- SECTION III - POLICY DETAIL, CONTINUED ----------------------- ------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PROHIBITED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- ------------------------- ----------------------------------------------- PROHIBITED SERVICES Services which result 1. Bookkeeping or other services in the auditors losing related to the accounting records or independence status financial statements of the audit under the Rule. client* 2. Financial information systems design and implementation* 3. Appraisal or valuation services, fairness* opinions, or contribution-in-kind reports 4. Actuarial services (i.e., setting actuarial reserves versus actuarial audit work)* 5. Internal audit outsourcing services* 6. Management functions or human resources 7. Broker or dealer, investment advisor, or investment banking services 8. Legal services and expert services unrelated to the audit 9. Any other service that the Public Company Accounting Oversight Board determines, by regulation, is impermissible ----------------------- ------------------------- ----------------------------------------------- ------------------------------------------- ------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------------- ------------------------------ o These services are not to be o A summary of all performed with the exception of the(*) services and related services that may be permitted fees reported at each if they would not be subject to audit regularly scheduled procedures at the audit client (as Audit Committee meeting defined in rule 2-01(f)(4)) level will serve as continual the firm providing the service. confirmation that has 				 not provided any restricted services. ------------------------------------------- ------------------------------ -------------------------------------------------------------------------------- GENERAL AUDIT COMMITTEE APPROVAL POLICY: o For all projects, the officers of the Funds and the Fund's auditors will each make an assessment to determine that any proposed projects will not impair independence. o Potential services will be classified into the four non-restricted service categories and the "Approval of Audit, Audit-Related, Tax and Other Services" Policy above will be applied. Any services outside the specific pre-approved service subcategories set forth above must be specifically approved by the Audit Committee. o At least quarterly, the Audit Committee shall review a report summarizing the services by service category, including fees, provided by the Audit firm as set forth in the above policy. -------------------------------------------------------------------------------- (2) Disclose the percentage of services described in each of paragraphs (b) through (d) of this Item that were approved by the audit committee pursuant to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X. N/A (f) If greater than 50 percent, disclose the percentage of hours expended on the principal accountant's engagement to audit the registrant's financial statements for the most recent fiscal year that were attributed to work performed by persons other than the principal accountant's full-time, permanent employees. N/A (g) Disclose the aggregate non-audit fees billed by the registrant's accountant for services rendered to the registrant, and rendered to the registrant's investment adviser (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant for each of the last two fiscal years of the registrant. N/A (h) Disclose whether the registrant's audit committee of the board of trustees has considered whether the provision of non-audit services that were rendered to the registrant's investment adviser (not including any subadviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the investment adviser that provides ongoing services to the registrant that were not pre-approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant's independence. The Fund's audit committee of the Board of Trustees has considered whether the provision of non-audit services that were rendered to the Affiliates (as defined) that were not pre- approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant's independence. Item 5. Audit Committee of Listed Registrants (a) If the registrant is a listed issuer as defined in Rule 10A-3 under the Exchange Act (17 CFR 240.10A-3), state whether or not the registrant has a separately-designated standing audit committee established in accordance with Section 3(a)(58)(A) of the Exchange Act (15 U.S.C. 78c(a)(58)(A)). If the registrant has such a committee, however designated, identify each committee member. If the entire board of directors is acting as the registrants audit committee as specified in Section 3(a)(58)(B) of the Exchange Act (15 U.S.C. 78c(a)(58)(B)), so state. N/A (b) If applicable, provide the disclosure required by Rule 10A-3(d) under the Exchange Act (17 CFR 240.10A-3(d)) regarding an exemption from the listing standards for audit committees. N/A Item 6. Schedule of Investments. File Schedule I Investments in securities of unaffiliated issuers as of the close of the reporting period as set forth in 210.12- 12 of Regulation S-X [17 CFR 210.12-12], unless the schedule is included as part of the report to shareholders filed under Item 1 of this Form. Included in Item 1 ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END MANAGEMENT INVESTMENT COMPANIES. A closed-end management investment company that is filing an annual report on this Form N-CSR must, unless it invests exclusively in non-voting securities, describe the policies and procedures that it uses to determine how to vote proxies relating to portfolio securities, including the procedures that the company uses when a vote presents a conflict between the interests of its shareholders, on the one hand, and those of the company's investment adviser; principal underwriter; or any affiliated person (as defined in Section 2(a)(3) of the Investment Company Act of 1940 (15 U.S.C. 80a-2(a)(3)) and the rules thereunder) of the company, its investment adviser, or its principal underwriter, on the other. Include any policies and procedures of the company's investment adviser, or any other third party, that the company uses, or that are used on the company's behalf, to determine how to vote proxies relating to portfolio securities. Not applicable to open-end management investment companies. Item 8. Portfolio Managers of Closed-End Management Investment Companies. (a) If the registrant is a closed-end management investment company that is filing an annual report on this Form N-CSR,provide the following information: (1) State the name, title, and length of service of the person or persons employed by or associated with the registrant or an investment adviser of the registrant who are primarily responsible for the day-to-day management of the registrants portfolio (Portfolio Manager). Also state each Portfolio Managers business experience during the past 5 years. Not applicable to open-end management investment companies. Item 9. Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers. (a) If the registrant is a closed-end management investment company, in the following tabular format, provide the information specified in paragraph (b) of this Item with respect to any purchase made by or on behalf of the registrant or any affiliated purchaser, as defined in Rule 10b-18(a)(3) under the Exchange Act (17 CFR 240.10b-18(a)(3)), of shares or other units of any class of the registrants equity securities that is registered by the registrant pursuant to Section 12 of the Exchange Act (15 U.S.C. 781). Instruction to paragraph (a). Disclose all purchases covered by this Item, including purchases that do not satisfy the conditions of the safe harbor of Rule 10b-18 under the Exchange Act (17 CFR 240.10b-18), made in the period covered by the report. Provide disclosures covering repurchases made on a monthly basis. For example, if the reporting period began on January 16 and ended on July 15, the chart would show repurchases for the months from January 16 through February 15, February 16 through March 15, March 16 through April 15, April 16 through May 15, May 16 through June 15, and June 16 through July 15. Not applicable to open-end management investment companies. Item 10. Submission of Matters to a Vote of Security Holders. Describe any material changes to the procedures by which shareholders may recommend nominees to the registrants board of directors, where those changes were implemented after the registrant last provided disclosure in response to the requirements of Item 7(d)(2)(ii)(G) of Schedule 14A (17 CFR 240.14a-101), or this Item. There have been no material changes to the procedures by which the shareholders may recommend nominees to the registrants board of directors since the registrant last provided disclosure in response to the requirements of Item 7(d)(2)(ii)(G) of Schedule 14(A) in its definitive proxy statement, or this Item. ITEM 11. CONTROLS AND PROCEDURES. (a) Disclose the conclusions of the registrant's principal executive officer or officers and principal financial officer or officers, or persons performing similar functions, about the effectiveness of the registrant's disclosure controls and procedures (as defined in Rule 30a-2(c) under the Act (17 CFR 270.30a-2(c))) based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of the report that includes the disclosure required by this paragraph. The registrant's principal executive officer and principal financial officer have concluded that the registrant's disclosure controls and procedures are effective based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this report. (b) Disclose whether or not there were significant changes in the registrant's internal controls or in other factors that could significantly affect these controls subsequent to the date of their evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses. There were no significant changes in the registrant's internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. The registrant's principal executive officer and principal financial officer, however, voluntarily are reporting the following information: In August of 2006 the registrant's investment adviser enhanced its internal procedures for reporting performance information required to be included in prospectuses. Those enhancements involved additional internal controls over the appropriateness of performance data generated for this purpose. Such enhancements were made following an internal review which identified prospectuses relating to certain classes of shares of a limited number of registrants where, inadvertently, performance information not reflecting the deduction of applicable sales charges was included. Those prospectuses were revised, and the revised prospectuses were distributed to shareholders. ITEM 12. EXHIBITS. File the exhibits listed below as part of this Form. Letter or number the exhibits in the sequence indicated. (a) Any code of ethics, or amendment thereto, that is the subject of the disclosure required by Item 2, to the extent that the registrant intends to satisfy the Item 2 requirements through filing of an exhibit. (b) A separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2 under the Act (17 CFR 270.30a-2). Filed herewith. SIGNATURES [See General Instruction F] Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. (Registrant) Pioneer Series Trust X By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr, President Date November 29, 2012 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr., President Date November 29, 2012 By (Signature and Title)* /s/ Mark Bradley Mark Bradley, Treasurer & Chief Accounting & Financial Officer Date November 29, 2012 * Print the name and title of each signing officer under his or her signature.