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 811-21978 Pioneer Series Trust VI (Exact name of registrant as specified in charter) 60 State Street, Boston, MA 02109 (Address of principal executive offices) (ZIP code) Terrence J. Cullen, Amundi Pioneer Asset 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: October 31 Date of reporting period: November 1, 2017 through October 31, 2018 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 STOCKHOLDERS. Pioneer Flexible Opportunities Fund -------------------------------------------------------------------------------- Annual Report | October 31, 2018 -------------------------------------------------------------------------------- Ticker Symbols: Class A PMARX Class C PRRCX Class K FLEKX Class R MUARX Class Y PMYRX [LOGO] Amundi Pioneer ============== ASSET MANAGEMENT visit us: www.amundipioneer.com Table of Contents President's Letter 2 Portfolio Management Discussion 4 Portfolio Summary 10 Prices and Distributions 11 Performance Update 12 Comparing Ongoing Fund Expenses 17 Consolidated Schedule of Investments 19 Consolidated Financial Statements 35 Consolidated Notes to Financial Statements 44 Report of Independent Registered Public Accounting Firm 61 Additional Information 63 Approval of Investment Management Agreement 65 Trustees, Officers and Service Providers 70 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 1 President's Letter Despite economic news that has remained generally positive throughout 2018, market volatility has increased significantly this year compared with 2017. October was a particularly poor month for both U.S. and global equity markets, as every major stock market index finished the month in negative territory. Results have been more mixed on the fixed-income side, with rising interest rates pushing down most year-to-date returns. On the economic front, U.S. gross domestic product (GDP) growth exceeded 4% in the second quarter of 2018 and topped 3% once again in the third quarter. The low unemployment rate has continued, with initial jobless claims recently hitting a multi-decade low and consumer and small-business confidence also achieving levels not seen in many years. Despite the good economic news, and even though wages have been rising, inflation expectations have not risen significantly. For its part, the U.S. Federal Reserve System (the Fed) has continued with its tightening of monetary policy by raising interest rates three times in 2018, while moving forward with the tapering of its balance sheet, a process which began in October 2017. The greater market volatility this year as compared to last year has been driven by several factors. The aforementioned rising interest rates have been one reason, while the uncertainty surrounding U.S. trade policy has, at times, also led to unsettled markets. Of course, in today's global economy, risk factors extend well beyond U.S. borders, and in recent months investors have grappled with various issues on the international front, including questions surrounding the United Kingdom's Brexit negotiations, concerns about the budgetary policies of the populist Italian government, and the potential impact of Turkey's economic challenges on European banks. Moreover, while trade tensions between the U.S. and Europe have moderated, questions about the future of the U.S./China trade relationship remain unresolved, and any major fracture in that relationship could have a negative impact on China's economy and, by extension, on its Asian trade partners. With regard to our market outlook, over the medium term, we believe the fundamental investment case for U.S. equities remains in place, with support from the fairly positive economic backdrop and with an additional lift potentially coming from the investment side as U.S. businesses consider increasing capital expenditures. We do believe market volatility will persist and, therefore, careful selection of investment themes, sector allocations, and individual stocks will be increasingly relevant to overall performance, as the 2 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 maturity of the economic and market cycles could eventually become headwinds. We believe a focus on owning shares of quality companies trading at reasonable prices is key to navigating the current equity-market phase. In fixed income, we have taken a more cautious approach across our core portfolios with regard to credit-sensitive debt such as corporate bonds, favoring quality and liquidity. As interest rates have risen, we find that short- and intermediate-term U.S. Treasuries have become more attractive, and that agency mortgage-backed securities (MBS) and high-quality, non-agency MBS now also offer lower downside risk. In general, we think structured sectors (such as asset-backed securities and MBS) are more attractive than corporate sectors. We believe this year's market fluctuations as well as increased risk factors within the global economy have served to remind investors of the importance of active management. Since 1928, active management has been the foundation of Amundi Pioneer's investment approach. We believe active management is especially important during periods of volatility, and that our shareowners can benefit from the experience and tenure of our investment teams, who work collaboratively to make active and informed decisions across our funds. As always, and particularly during times of market uncertainty, we encourage you to work with your financial advisor to develop an overall investment plan that addresses both your short- and long-term goals, and to implement such a plan in a disciplined manner. We greatly appreciate the trust you have placed in us and look forward to continuing to serve you in the future. Sincerely, /s/ Lisa M. Jones Lisa M. Jones Head of the Americas, President and CEO of U.S. Amundi Pioneer Asset Management USA, Inc. October 31, 2018 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. Past performance is no guarantee of future results. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 3 Portfolio Management Discussion | 10/31/18 In the following discussion, Michele Garau and Howard Weiss review recent market events and describe the factors that affected the performance of Pioneer Flexible Opportunities Fund during the 12-month period ended October 31, 2018. Mr. Garau, a senior vice president and a portfolio manager at Amundi Pioneer Asset Management, Inc. ("Amundi Pioneer"), is responsible for the management of the Fund, along with Mr. Weiss, CFA, a vice president and portfolio manager at Amundi Pioneer, and Kenneth J. Taubes, Executive Vice President, Chief Investment Officer, U.S., and a portfolio manager at Amundi Pioneer. Q How did the Fund perform during the 12-month period ended October 31, 2018? A Pioneer Flexible Opportunities Fund's Class A shares returned -2.08% at net asset value during the 12-month period ended October 31, 2018, while the Fund's benchmark, the Bloomberg Barclays U.S. Treasury TIPS 1-10 Year Index (the Bloomberg Barclays Index), returned -0.61%. During the same period, the average return of the 283 mutual funds in Morningstar's Tactical Allocation Funds category was -1.82%. Q How did the financial markets perform during the 12-month period ended October 31, 2018? A The equity and fixed-income markets produced mixed returns over the period, with the strength of the U.S. economy acting as the main driver of performance across asset classes. As of the close of the period, U.S. gross domestic product (GDP) appeared to be on track for a greater-than 3% expansion for 2018 as a whole, thanks to the combination of significant tax cuts, deregulation, and stronger fixed-investment spending. In addition, solid employment numbers and income growth supported both consumption and housing prices. In turn, positive economic trends led to corporate profit growth that came in well ahead of expectations. Those factors contributed to positive performance for U.S. equities for the 12 months, as the Standard & Poor's 500 Index returned 7.4% -- even though the headline equity indices finished well off their peaks established earlier in the year after a market sell-off in September and October. During the final two months of the period, investors appeared to grow increasingly concerned about the potential for tighter U.S. Federal Reserve (the Fed) monetary policy in the coming calendar year. Additionally, stock market performance was hurt by worries that the Trump administration's protectionist trade policies would result in slower global economic growth. 4 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 Although U.S. stocks ended the period with a solid gain, the story was quite different overseas. Signs of slowing economic growth in Europe and China led to negative returns for equities in both the developed and emerging markets. The two asset classes came under further pressure from weakness in foreign currencies versus the U.S. dollar (USD). Since currencies have historically tended to perform well when interest rates are rising, the Fed's aggressive monetary tightening -- including a number of rate increases -- relative to other global central banks provided a strong tailwind for the USD. The combination of robust economic growth and tighter Fed policy led to poor returns across the investment-grade bond market. The Fed raised interest rates four times over the course of the year, and continued to reduce the size of its balance sheet. What's more, the consensus expectation was that the Fed would raise rates several more times before the end of 2019. Emerging markets bonds, which faced the added challenges of political turmoil in Argentina and Turkey, were particularly poor performers during the period. However, domestic high-yield bonds, which benefited from improving economic conditions, posted a narrow gain. Q Could you discuss some of the investment decisions that factored into the Fund's benchmark-relative performance during the 12-month period ended October 31, 2018? A The Fund's allocation to international equities was the primary reason for its underperformance relative to the Bloomberg Barclays Index over the 12-month period. An allocation to emerging markets equities was an especially large detractor from the Fund's benchmark-relative returns, even though we reduced the size of the position in the latter part of the period. The Fund's allocation to non-U.S. developed-market equities also detracted from benchmark-relative performance, as did our decision to add to the portfolio's weighting in the segment during the second calendar quarter of 2018, after several months of weakness for foreign currencies. The downturn, in fact, persisted through the end of October, so increasing the Fund's allocation detracted even further from benchmark-relative results by giving the portfolio greater exposure to the ongoing underperformance of both overseas stocks and the related currencies. On the positive side, the Fund's allocation to U.S. equities aided benchmark-relative returns, led by a number of stocks in the health care and information technology sectors. A portfolio underweight in Treasury Inflation-Protected Securities (TIPS), which make up 100% of the benchmark Bloomberg Barclays Index, was an additional positive Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 5 contributor to relative performance. Finally, a small portfolio position in Greek government debt contributed positively to the Fund's benchmark-relative performance, and offset the weakness of the Fund's investments in emerging markets corporate bonds. Q Can you discuss how you used derivatives as part of your investment strategy and how the use of derivatives affected the Fund's benchmark-relative performance during the 12-month period ended October 31, 2018? A We used derivatives across a broad spectrum of asset classes to establish specific market or issuer exposure within the portfolio, and to attempt to hedge downside risk. The derivative instruments we used included equity, fixed-income, and commodity futures; credit-linked securities; long or short positions in exchange-traded funds (ETFs); forward foreign currency contracts; Treasury futures contracts (also long or short positions); and options on both indices and individual securities. The Fund's use of derivatives had a positive effect on benchmark-relative results over the 12-month period. Q Could you discuss your outlook and the Fund's current positioning? A Our view is that while market volatility is likely to continue, the key trends in the world economy remain largely intact. Global economic growth appears to be decelerating somewhat, but unless the U.S. economy runs into trouble or China falls into recession, there is no reason to believe that the slowdown will be severe, in our opinion. The growth gap between the United States and the rest of the world remains large, and all signs indicate that the trend is set to continue. With that as a backdrop, we maintained a fairly steady portfolio positioning over the course of the Fund's fiscal year. The Fund's asset allocation remains heavily biased toward equities, with a total weighting of 79% in stocks at the end of October. At the regional level, the Fund has approximately 41% of its invested assets in North America, 26% in other developed economies, and 12% in the emerging markets (primarily China). We have continued to tilt the portfolio toward the United States, despite rich equity valuations, as we do not see a reason for a meaningful compression in the country's valuation premium versus the international markets. Additionally, domestic companies have been buying back shares at a faster pace than their global peers. While the investment potential in the foreign developed markets cannot be easily dismissed, we believe the United States remains the safest option. We find most emerging markets unattractive on a valuation basis, given that the asset class has tended to underperform when the Fed is tightening monetary policy. As a result, we made a sizable reduction in the Fund's weighting in the emerging markets compared with one year ago. 6 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 At the sector level, we have a preference for investments in aerospace & defense, U.S. health care, cybersecurity, and luxury & leisure companies. Overseas, the Fund has positions in European insurance, European and Singaporean real estate, and banks in Europe, Japan, and the emerging markets. The portfolio's allocation to bank stocks is structural in nature, as we expect the sector's fundamentals will benefit from multi-year tailwinds. As of period-end, the Fund retains a meaningful allocation to ETFs that invest in high-quality, dividend-paying* stocks. The PowerShares Buyback Achievers ETF, which invests in U.S.-listed equities that have repurchased at least 5% or more of their shares outstanding in the trailing 12 months, also continues to represent a substantial Fund position. We believe dividends and share buybacks are an indication of management teams that prioritize prudent capital allocation. Conversely, we see little value in fixed-income investments in an environment of healthy economic growth and tighter central-bank policies. At present, the Fund has only a small allocation to fixed income, with the majority held in domestic high-yield and emerging markets debt. Throughout the course of the Fund's fiscal year, we maintained enough cash in the portfolio to implement the aspect of our investment strategy that reflects our desire to maintain sufficient flexibility, with the goal of capitalizing on potentially higher market volatility in the months ahead. We also see less of an opportunity cost for holding cash, given that tighter Fed monetary policies have led to more compelling yields in certain areas. The Fund's positioning reflects our understanding of the current economic climate. With that said, uncertainty persists with respect to how geopolitical tensions or changes to major trade relationships could influence fundamentals and undermine economic growth. We therefore remain acutely focused on determining whether those external considerations may have an impact on our core outlook, which would in turn affect our investment orientation as well as the Fund's asset allocations. * Dividends are not guaranteed. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 7 Please refer to the Schedule of Investments on pages 19-34 for a full listing of Fund securities. All investments are subject to risk, including the possible loss of principal. In the past several years, financial markets have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. These conditions may continue, recur, worsen or spread. All investments are subject to risk, including the possible loss of principal. The Fund has the ability to invest in a wide variety of securities and asset classes. The Fund may invest in underlying funds (including ETFs). 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 through the use of derivatives, which increases the volatility of investment returns and subjects the Fund to magnified losses if the Fund or 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 and some of the underlying funds may employ short selling, a speculative strategy. Unlike the possible loss on a security that is purchased, there is no limit to the amount of loss on an appreciating security that is sold short. 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 insurance-linked securities, including event-linked bonds. The return of principal and the payment of interest on insurance-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. 8 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 The Fund may invest in commodity-linked derivatives. 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. Investments in equity securities are subject to price fluctuation. Small- and mid-cap stocks involve greater risks and volatility than large-cap stocks. International investments are subject to special risks, including currency fluctuations, and 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 will generally fall. Prepayment risk is the chance that an issuer may exercise its right to repay its security, if falling interest rates prompt the issuer to do so. Forced to reinvest the unanticipated proceeds at lower interest rates, the Fund would experience a decline in income and lose the opportunity for additional price appreciation. 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 prepayments. High-yield bonds possess greater price volatility, illiquidity, and possibility of default. These risks may increase share price volatility. There is no assurance that these and other strategies used by the Fund or underlying funds will be successful. Please see the prospectus for a more complete discussion of the Fund's risks. Before investing, consider the product's investment objectives, risks, charges and expenses. Contact your advisor or Amundi Pioneer Asset Management, Inc., for a prospectus or summary prospectus containing this information. Read it carefully. 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. Past performance is no guarantee of future results. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 9 Portfolio Summary | 10/31/18 Sector Distribution -------------------------------------------------------------------------------- (As a percentage of total investments)* [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Financials 32.3% Health Care 14.9% Industrials 12.1% Consumer Discretionary 7.9% Materials 6.9% Government 6.2% Information Technology 6.0% Real Estate 5.0% Energy 3.7% Communication Services 3.1% Consumer Staples 1.2% Utilities 0.7% Portfolio Diversification -------------------------------------------------------------------------------- (As a percentage of total investments)* [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Common Stocks 83.1% Investment Companies 4.5% Corporate Bonds 4.3% Foreign Government Bonds 3.5% U.S. Government and Agency Obligations 2.8% Over The Counter (OTC) Call Options Purchased 1.3% Exchange-Traded Call Options Purchased 0.4% Exchange-Traded Commodity 0.1% Exchange-Traded Put Options Purchased 0.0%+ Preferred Stocks 0.0%+ + Amount rounds to less than 0.1%. 10 Largest Holdings -------------------------------------------------------------------------------- (As a percentage of total investments)* 1. ETFMG Prime Cyber Security ETF 3.52% -------------------------------------------------------------------------------- 2. Ping An Insurance Group Co. of China, Ltd., Class H 1.84 -------------------------------------------------------------------------------- 3. Booz Allen Hamilton Holding Corp. 1.48 -------------------------------------------------------------------------------- 4. Anthem, Inc. 1.46 -------------------------------------------------------------------------------- 5. Indonesia Government International Bond, 3.375%, 4/15/23 (144A) 1.45 -------------------------------------------------------------------------------- 6. U.S. Treasury Bills, 11/8/18 1.39 -------------------------------------------------------------------------------- 7. Thermo Fisher Scientific, Inc. 1.38 -------------------------------------------------------------------------------- 8. U.S. Treasury Bills, 11/23/18 1.32 -------------------------------------------------------------------------------- 9. Microsoft Corp. 1.25 -------------------------------------------------------------------------------- 10. UnitedHealth Group, Inc. 1.23 -------------------------------------------------------------------------------- * Excludes temporary cash investments and all derivative contracts except for options purchased. The Fund 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 Flexible Opportunities Fund | Annual Report | 10/31/18 Prices and Distributions | 10/31/18 Net Asset Value per Share -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 10/31/18 10/31/17 -------------------------------------------------------------------------------- A $12.69 $14.17 -------------------------------------------------------------------------------- C $12.45 $13.95 -------------------------------------------------------------------------------- R $12.60 $14.11 -------------------------------------------------------------------------------- Y $12.74 $14.22 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 10/31/18 6/22/18 -------------------------------------------------------------------------------- K* $12.69 $13.67 -------------------------------------------------------------------------------- Distributions per Share: 11/1/17 -- 10/31/18 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Short-Term Long-Term Class Dividends Capital Gains Capital Gains -------------------------------------------------------------------------------- A $0.3462 $0.5291 $0.3551 -------------------------------------------------------------------------------- C $0.2688 $0.5291 $0.3551 -------------------------------------------------------------------------------- K $0.0430 $ -- $ -- -------------------------------------------------------------------------------- R $0.2914 $0.5291 $0.3551 -------------------------------------------------------------------------------- Y $0.3768 $0.5291 $0.3551 -------------------------------------------------------------------------------- The Bloomberg Barclays U.S. Treasury TIPS 1-10 Year Index is an unmanaged index comprised of U.S. Treasury Inflation Protected Securities (TIPS) having a maturity of at least 1 year and less than 10 years. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. It is not possible to invest directly in an index. The index defined here pertains to the "Value of $10,000 Investment" and "Value of $5 Million Investment" charts on pages 12-16. * Class K shares commenced operations on June 22, 2018 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 11 Performance Update | 10/31/18 Class A Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Class A shares of Pioneer Flexible Opportunities Fund at public offering price during the periods shown, compared to that of the Bloomberg Barclays U.S. Treasury TIPS 1-10 Year Index. Average Annual Total Returns (As of October 31, 2018) ---------------------------------------------------------- BBG Barclays Net Public U.S. Treasury Asset Offering TIPS Value Price 1-10 Year Period (NAV) (POP) Index ---------------------------------------------------------- Life of Class (5/3/2010) 6.60% 6.03% 1.90% 5 years 4.16 3.21 0.69 1 year -2.08 -6.49 -0.61 ---------------------------------------------------------- Expense Ratio (Per prospectus dated March 1, 2018) ---------------------------------------------------------- Gross ---------------------------------------------------------- 1.22% ---------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Bloomberg Barclays Pioneer Flexible U.S. Treasury TIPS Opportunities Fund 1-10 Year Index 5/10 $ 9,550 $10,000 10/10 $10,152 $10,481 10/11 $10,822 $11,217 10/12 $11,689 $11,797 10/13 $13,409 $11,351 10/14 $13,604 $11,419 10/15 $13,991 $11,277 10/16 $14,114 $11,804 10/17 $16,790 $11,821 10/18 $16,441 $11,749 Call 1-800-225-6292 or visit www.amundipioneer.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. POP returns reflect deduction of maximum 4.50% sales charge. NAV 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. Please refer to the financial highlights for a more current expense ratio. 12 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 Performance Update | 10/31/18 Class C Shares Investment Returns The mountain chart on the right shows the change in value of a $10,000 investment made in Class C shares of Pioneer Flexible Opportunities Fund during the periods shown, compared to that of the Bloomberg Barclays U.S. Treasury TIPS 1-10 Year Index. Average Annual Total Returns (As of October 31, 2018) ---------------------------------------------------------- BBG Barclays U.S. Treasury TIPS If If 1-10 Year Period Held Redeemed Index ---------------------------------------------------------- Life of Class (5/3/2010) 5.79% 5.79% 1.90% 5 years 3.35 3.35 0.69 1 year -2.83 -2.83 -0.61 ---------------------------------------------------------- Expense Ratio (Per prospectus dated March 1, 2018) ---------------------------------------------------------- Gross ---------------------------------------------------------- 1.97% ---------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Bloomberg Barclays Pioneer Flexible U.S. Treasury TIPS Opportunities Fund 1-10 Year Index 5/10 $10,000 $10,000 10/10 $10,600 $10,481 10/11 $11,203 $11,217 10/12 $12,007 $11,797 10/13 $13,680 $11,351 10/14 $13,762 $11,419 10/15 $14,053 $11,277 10/16 $14,065 $11,804 10/17 $16,599 $11,821 10/18 $16,129 $11,749 Call 1-800-225-6292 or visit www.amundipioneer.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. NAV 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. Please refer to the financial highlights for a more current expense ratio. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 13 Performance Update | 10/31/18 Class K Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 million investment made in Class K shares of Pioneer Flexible Opportunities Fund during the periods shown, compared to that of the Bloomberg Barclays U.S. Treasury TIPS 1-10 Year Index. Average Annual Total Returns (As of October 31, 2018) ---------------------------------------------------------- BBG Barclays Net U.S. Treasury Asset TIPS Value 1-10 Year Period (NAV) Index ---------------------------------------------------------- Life of Fund (5/3/2010) 6.61% 1.90% 5 years 4.18 0.69 1 year -2.00 -0.61 ---------------------------------------------------------- Expense Ratio (Per prospectus dated March 1, 2018) ---------------------------------------------------------- Gross Net ---------------------------------------------------------- 0.97% 0.94% ---------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $5 Million Investment Bloomberg Barclays Pioneer Flexible U.S. Treasury TIPS Opportunities Fund 1-10 Year Index 5/10 $5,000,000 $5,000,000 10/10 $5,315,000 $5,240,571 10/11 $5,665,914 $5,608,620 10/12 $6,119,889 $5,898,426 10/13 $7,020,648 $5,675,619 10/14 $7,122,391 $5,709,622 10/15 $7,325,209 $5,638,580 10/16 $7,389,684 $5,902,161 10/17 $8,790,686 $5,910,714 10/18 $8,614,719 $5,874,506 Call 1-800-225-6292 or visit us.amundipioneer.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. The performance shown for Class K shares for the period prior to the commencement of operations of Class K shares on June 22, 2018, is the net asset value performance of the Fund's Class A shares, which has not been restated to reflect any differences in expenses, including Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares generally are higher than those of Class K shares, the performance of Class K shares prior to their inception on June 22, 2018, would have been higher than the performance shown. For the period beginning June 22, 2018, the actual performance of Class K shares is reflected. Class K shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects the contractual expense limitation currently in effect through March 1, 2019, for Class K shares. There can be no assurance that Amundi 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. Please refer to the financial highlights for a more current expense ratio. 14 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 Performance Update | 10/31/18 Class R Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Class R shares of Pioneer Flexible Opportunities Fund during the periods shown, compared to that of the Bloomberg Barclays U.S. Treasury TIPS 1-10 Year Index. Average Annual Total Returns (As of October 31, 2018) ---------------------------------------------------------- BBG Barclays Net U.S. Treasury Asset TIPS Value 1-10 Year Period (NAV) Index ---------------------------------------------------------- Life of Fund (5/3/2010) 6.24% 1.90% 5 years 3.56 0.69 1 year -2.71 -0.61 ---------------------------------------------------------- Expense Ratio (Per prospectus dated March 1, 2018) ---------------------------------------------------------- Gross ---------------------------------------------------------- 1.66% ---------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Bloomberg Barclays Pioneer Flexible U.S. Treasury TIPS Opportunities Fund 1-10 Year Index 5/10 $10,000 $10,000 10/10 $10,630 $10,481 10/11 $11,332 $11,217 10/12 $12,240 $11,797 10/13 $14,037 $11,351 10/14 $14,204 $11,419 10/15 $14,473 $11,277 10/16 $14,522 $11,804 10/17 $17,188 $11,821 10/18 $16,722 $11,749 Call 1-800-225-6292 or visit www.amundipioneer.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 September 13, 2013, 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 September 13, 2013, 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 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. Please refer to the financial highlights for a more current expense ratio. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 15 Performance Update | 10/31/18 Class Y Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 million investment made in Class Y shares of Pioneer Flexible Opportunities Fund during the periods shown, compared to that of the Bloomberg Barclays U.S. Treasury TIPS 1-10 Year Index. Average Annual Total Returns (As of October 31, 2018) ---------------------------------------------------------- BBG Barclays Net U.S. Treasury Asset TIPS Value 1-10 Year Period (NAV) Index ---------------------------------------------------------- Life of Class (5/3/2010) 6.90% 1.90% 5 years 4.44 0.69 1 year -1.86 -0.61 ---------------------------------------------------------- Expense Ratio (Per prospectus dated March 1, 2018) ---------------------------------------------------------- Gross Net ---------------------------------------------------------- 0.99% 0.94% ---------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $5 Million Investment Bloomberg Barclays Pioneer Flexible U.S. Treasury TIPS Opportunities Fund 1-10 Year Index 5/10 $5,000,000 $5,000,000 10/10 $5,325,000 $5,240,571 10/11 $5,691,660 $5,608,620 10/12 $6,165,512 $5,898,426 10/13 $7,094,397 $5,675,619 10/14 $7,215,104 $5,709,622 10/15 $7,445,829 $5,638,580 10/16 $7,532,841 $5,902,161 10/17 $8,982,396 $5,910,714 10/18 $8,815,733 $5,874,506 Call 1-800-225-6292 or visit www.amundipioneer.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 March 1, 2019, for Class Y shares. There can be no assurance that Amundi 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. Please refer to the financial highlights for a more current expense ratio. 16 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 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 Flexible Opportunities Fund Based on actual returns from May 1, 2018, through October 31, 2018. ---------------------------------------------------------------------------------------------- Share Class A C K R Y ---------------------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 5/1/18 ---------------------------------------------------------------------------------------------- Ending Account $ 917.46 $ 913.17 $ 980.00 $ 913.35 $ 918.14 Value (after expenses) on 10/31/18 ---------------------------------------------------------------------------------------------- Expenses Paid $ 5.51 $ 9.21 $ 3.15 $ 8.78 $ 4.35 During Period* ---------------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized net expense ratio of 1.14%, 1.91%, 0.88%, 1.82% and 0.90% for Class A, Class C, Class K, Class R and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 184/365 and 132/365 for Class K (to reflect the one-half year period). Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 17 Hypothetical Example for Comparison Purposes The table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the tables are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as sales charges (loads) that are charged at the time of the transaction. Therefore, the table below is useful in comparing ongoing costs only and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher. Expenses Paid on a $1,000 Investment in Pioneer Flexible Opportunities Fund Based on a hypothetical 5% return per year before expenses, reflecting the period from May 1, 2018, through October 31, 2018. -------------------------------------------------------------------------------------------------- Share Class A C K R Y -------------------------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 5/1/18 -------------------------------------------------------------------------------------------------- Ending Account $1,019.46 $1,015.58 $1,014.90 $1,016.03 $1,020.67 Value (after expenses) on 10/31/18 -------------------------------------------------------------------------------------------------- Expenses Paid $ 5.80 $ 9.70 $ 3.21 $ 9.25 $ 4.58 During Period* -------------------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized net expense ratio of 1.14%, 1.91%, 0.88%, 1.82% and 0.90% for Class A, Class C, Class K, Class R and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 184/365 and 132/365 for Class K (to reflect the one-half year period). 18 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 Schedule of Investments | 10/31/18 (Consolidated) ----------------------------------------------------------------------------------------------------------------- Shares Value ----------------------------------------------------------------------------------------------------------------- UNAFFILIATED ISSUERS -- 96.8% COMMON STOCKS -- 78.5% of Net Assets AUTOMOBILES & COMPONENTS -- 0.4% Auto Parts & Equipment -- 0.4% 115,322 Dometic Group AB (144A) $ 805,655 5,490(a) Garrett Motion, Inc. 83,284 2,020,000 Xinyi Glass Holdings Ltd. 1,999,120 ------------ Total Automobiles & Components $ 2,888,059 ----------------------------------------------------------------------------------------------------------------- BANKS -- 8.5% Diversified Banks -- 7.3% 309,627 ABN AMRO Group NV (144A) $ 7,602,106 418,030 Bank for Foreign Trade of Vietnam JSC 995,587 8,238,000 China Construction Bank Corp., Class H 6,534,885 1,638,500 China Merchants Bank Co., Ltd., Class H 6,310,724 19,409 Citigroup, Inc. 1,270,513 136,100 DBS Group Holdings, Ltd. 2,303,351 352,502 FinecoBank Banca Fineco S.p.A. 3,687,660 7,858,000 Industrial & Commercial Bank of China, Ltd., Class H 5,311,457 29,558 JPMorgan Chase & Co. 3,222,413 386,700 Kasikornbank PCL 2,331,419 358,801 Sberbank of Russia PJSC (A.D.R.) 4,194,384 48,300 Sumitomo Mitsui Financial Group, Inc. 1,885,941 130,500 United Overseas Bank, Ltd. 2,295,188 ------------ $ 47,945,628 ----------------------------------------------------------------------------------------------------------------- Thrifts & Mortgage Finance -- 1.2% 344,844 Carlyle Group LP $ 6,989,988 143,054 OneSavings Bank Plc 681,842 ------------ $ 7,671,830 ------------ Total Banks $ 55,617,458 ----------------------------------------------------------------------------------------------------------------- CAPITAL GOODS -- 9.9% Aerospace & Defense -- 5.4% 15,267 Airbus SE $ 1,687,828 14,553 Boeing Co. 5,164,278 748,313(a) Bombardier, Inc., Class B 1,812,611 22,843 BWX Technologies, Inc. 1,335,402 33,817 L3 Technologies, Inc. 6,407,307 40,389 Raytheon Co. 7,069,690 49,251 Safran SA 6,355,441 43,047 Thales SA 5,503,725 ------------ $ 35,336,282 ----------------------------------------------------------------------------------------------------------------- Building Products -- 0.0%+ 8,540(a) Resideo Technologies, Inc. $ 179,767 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 19 Schedule of Investments | 10/31/18 (Consolidated) (continued) ----------------------------------------------------------------------------------------------------------------- Shares Value ----------------------------------------------------------------------------------------------------------------- Construction & Engineering -- 0.3% 14,535 Fluor Corp. $ 637,505 19,087 Vinci SA 1,703,492 ------------ $ 2,340,997 ----------------------------------------------------------------------------------------------------------------- Electrical Components & Equipment -- 1.0% 38,317 Rockwell Automation, Inc. $ 6,311,959 ----------------------------------------------------------------------------------------------------------------- Industrial Conglomerates -- 1.7% 51,243 Honeywell International, Inc. $ 7,421,011 41,553 Rheinmetall AG 3,598,539 ------------ $ 11,019,550 ----------------------------------------------------------------------------------------------------------------- Industrial Machinery -- 1.5% 63,589 Ingersoll-Rand Plc $ 6,100,729 71,887 Interpump Group S.p.A. 2,074,082 9,021 Schindler Holding AG 1,900,382 ------------ $ 10,075,193 ------------ Total Capital Goods $ 65,263,748 ----------------------------------------------------------------------------------------------------------------- COMMERCIAL & PROFESSIONAL SERVICES -- 0.3% Environmental & Facilities Services -- 0.3% 24,363 Waste Management, Inc. $ 2,179,758 ------------ Total Commercial & Professional Services $ 2,179,758 ----------------------------------------------------------------------------------------------------------------- CONSUMER DURABLES & APPAREL -- 4.1% Apparel, Accessories & Luxury Goods -- 3.7% 8,899 adidas AG $ 2,094,305 40,194 Cie Financiere Richemont SA 2,938,059 14,373 Kering SA 6,400,853 23,272 LVMH Moet Hennessy Louis Vuitton SE 7,077,801 144,209 Moncler S.p.A. 5,009,174 3,029 Swatch Group AG 1,023,836 ------------ $ 24,544,028 ----------------------------------------------------------------------------------------------------------------- Footwear -- 0.4% 4,919 Puma SE $ 2,526,784 ------------ Total Consumer Durables & Apparel $ 27,070,812 ----------------------------------------------------------------------------------------------------------------- CONSUMER SERVICES -- 2.0% Casinos & Gaming -- 0.8% 624,000 Galaxy Entertainment Group, Ltd. $ 3,374,242 16,772(a Kambi Group Plc 464,109 31,914 Kindred Group Plc 340,077 52,554 LeoVegas AB (144A) 306,914 73,933(a) Mr. Green & Co. AB 560,732 ------------ $ 5,046,074 ----------------------------------------------------------------------------------------------------------------- Hotels, Resorts & Cruise Lines -- 0.3% 192,542 Melia Hotels International SA $ 1,978,093 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 20 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 ----------------------------------------------------------------------------------------------------------------- Shares Value ----------------------------------------------------------------------------------------------------------------- Restaurants -- 0.9% 85,141 Aramark $ 3,058,264 146,721 Compass Group Plc 2,885,725 ------------ $ 5,943,989 ------------ Total Consumer Services $ 12,968,156 ----------------------------------------------------------------------------------------------------------------- DIVERSIFIED FINANCIALS -- 5.2% Asset Management & Custody Banks -- 2.1% 213,615 Blackstone Group LP $ 6,912,581 195,521 KKR & Co., Inc. 4,624,072 226,193 St James's Place Plc 2,927,823 ------------ $ 14,464,476 ----------------------------------------------------------------------------------------------------------------- Consumer Finance -- 2.2% 81,111 Capital One Financial Corp. $ 7,243,212 102,994 Discover Financial Services 7,175,592 ------------ $ 14,418,804 ----------------------------------------------------------------------------------------------------------------- Diversified Capital Markets -- 0.3% 24,834 Macquarie Group, Ltd. $ 2,058,919 ----------------------------------------------------------------------------------------------------------------- Financial Exchanges & Data -- 0.4% 12,940 S&P Global, Inc. $ 2,359,221 ----------------------------------------------------------------------------------------------------------------- Investment Banking & Brokerage -- 0.2% 31,124 Morgan Stanley $ 1,421,122 ------------ Total Diversified Financials $ 34,722,542 ----------------------------------------------------------------------------------------------------------------- ENERGY -- 3.0% Integrated Oil & Gas -- 1.4% 51,721 LUKOIL PJSC (A.D.R.) $ 3,860,455 90,863 TOTAL SA 5,341,849 ------------ $ 9,202,304 ----------------------------------------------------------------------------------------------------------------- Oil & Gas Equipment & Services -- 0.5% 561,625(a) Saipem S.p.A. $ 3,072,404 ----------------------------------------------------------------------------------------------------------------- Oil & Gas Exploration & Production -- 0.9% 58,540 EOG Resources, Inc. $ 6,166,603 ----------------------------------------------------------------------------------------------------------------- Oil & Gas Storage & Transportation -- 0.2% 4,650,000 China Suntien Green Energy Corp., Ltd., Class H $ 1,186,066 ------------ Total Energy $ 19,627,377 ----------------------------------------------------------------------------------------------------------------- FOOD, BEVERAGE & TOBACCO -- 1.1% Packaged Foods & Meats -- 1.1% 256,500(a) Health & Happiness H&H International Holdings, Ltd. $ 1,458,975 461,910(a) Masan Group Corp. 1,642,224 101,479 Mondelez International, Inc. 4,260,088 ------------ Total Food, Beverage & Tobacco $ 7,361,287 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 21 Schedule of Investments | 10/31/18 (Consolidated) (continued) ----------------------------------------------------------------------------------------------------------------- Shares Value ----------------------------------------------------------------------------------------------------------------- HEALTH CARE EQUIPMENT & SERVICES -- 8.9% Health Care Equipment -- 5.2% 20,323 Abbott Laboratories $ 1,401,067 29,882 Becton Dickinson and Co. 6,887,801 55,456(a) Boston Scientific Corp. 2,004,180 54,472 Danaher Corp. 5,414,517 48,460 Hill-Rom Holdings, Inc. 4,074,517 8,797(a) IDEXX Laboratories, Inc. 1,866,019 12,698(a) Intuitive Surgical, Inc. 6,617,944 35,878 Stryker Corp. 5,820,129 ------------ $ 34,086,174 ----------------------------------------------------------------------------------------------------------------- Managed Health Care -- 3.7% 32,893 Anthem, Inc. $ 9,064,324 23,557 Humana, Inc. 7,547,898 29,273 UnitedHealth Group, Inc. 7,650,499 ------------ $ 24,262,721 ------------ Total Health Care Equipment & Services $ 58,348,895 ----------------------------------------------------------------------------------------------------------------- INSURANCE -- 9.4% Life & Health Insurance -- 6.3% 716,255 Aegon NV $ 4,398,888 327,200 AIA Group, Ltd. 2,476,622 551,000 China Taiping Insurance Holdings Co., Ltd. 1,841,105 1,014,523 Legal & General Group Plc 3,258,681 927,700 New China Life Insurance Co., Ltd., Class H 4,336,180 160,068 NN Group NV 6,882,140 1,214,000 Ping An Insurance Group Co. of China, Ltd., Class H 11,433,915 19,116(a) Swiss Life Holding AG 7,208,434 ------------ $ 41,835,965 ----------------------------------------------------------------------------------------------------------------- Multi-line Insurance -- 2.0% 40,218 Ageas $ 2,011,761 34,512 Allianz SE 7,202,124 154,546 AXA SA 3,871,424 ------------ $ 13,085,309 ----------------------------------------------------------------------------------------------------------------- Property & Casualty Insurance -- 0.4% 245,384 Direct Line Insurance Group Plc $ 1,032,627 21,743 Progressive Corp. 1,515,487 ------------ $ 2,548,114 ----------------------------------------------------------------------------------------------------------------- Reinsurance -- 0.7% 32,536 Hannover Rueck SE $ 4,384,411 ------------ Total Insurance $ 61,853,799 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 22 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 ----------------------------------------------------------------------------------------------------------------- Shares Value ----------------------------------------------------------------------------------------------------------------- MATERIALS -- 5.0% Copper -- 0.2% 145,244 OZ Minerals, Ltd. $ 927,793 ----------------------------------------------------------------------------------------------------------------- Diversified Metals & Mining -- 3.2% 202,207 Anglo American Plc $ 4,326,182 1,688,157(a) Glencore Plc 6,874,501 245,397 MMC Norilsk Nickel PJSC (A.D.R.) 4,061,320 286,320 Teck Resources, Ltd., Class B 5,915,765 ------------ $ 21,177,768 ----------------------------------------------------------------------------------------------------------------- Steel -- 1.6% 266,280 ArcelorMittal $ 6,640,266 100,366 Steel Dynamics, Inc. 3,974,494 ------------ $ 10,614,760 ------------ Total Materials $ 32,720,321 ----------------------------------------------------------------------------------------------------------------- MEDIA & ENTERTAINMENT -- 2.3% Advertising -- 0.3% 37,970 Stroeer SE & Co. KGaA $ 1,983,946 ----------------------------------------------------------------------------------------------------------------- Interactive Home Entertainment -- 0.4% 31,523(a) Electronic Arts, Inc. $ 2,867,963 ----------------------------------------------------------------------------------------------------------------- Interactive Media & Services -- 1.2% 37,405(a) Catena Media Plc $ 416,473 84,110(a) Momo, Inc. (A.D.R.) 2,823,573 149,222(a) Yandex NV 4,496,059 ------------ $ 7,736,105 ----------------------------------------------------------------------------------------------------------------- Publishing -- 0.4% 96,385 Lagardere SCA $ 2,638,036 ------------ Total Media & Entertainment $ 15,226,050 ----------------------------------------------------------------------------------------------------------------- PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 5.2% Biotechnology -- 1.4% 32,352(a) Alexion Pharmaceuticals, Inc. $ 3,625,689 10,645(a) Biogen, Inc. 3,238,954 6,123(a) Regeneron Pharmaceuticals, Inc. 2,077,166 ------------ $ 8,941,809 ----------------------------------------------------------------------------------------------------------------- Life Sciences Tools & Services -- 2.3% 91,878 Agilent Technologies, Inc. $ 5,952,776 5,447(a) Charles River Laboratories International, Inc. 663,553 36,735 Thermo Fisher Scientific, Inc. 8,583,133 ------------ $ 15,199,462 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 23 Schedule of Investments | 10/31/18 (Consolidated) (continued) ----------------------------------------------------------------------------------------------------------------- Shares Value ----------------------------------------------------------------------------------------------------------------- Pharmaceuticals -- 1.5% 12,626 Johnson & Johnson $ 1,767,514 50,174 Novartis AG 4,391,127 11,361 Roche Holding AG 2,761,796 12,149 Zoetis, Inc. 1,095,233 ------------ $ 10,015,670 ------------ Total Pharmaceuticals, Biotechnology & Life Sciences $ 34,156,941 ----------------------------------------------------------------------------------------------------------------- REAL ESTATE -- 4.7% Diversified Real Estate Activities -- 0.1% 113,800 City Developments, Ltd. $ 649,371 ----------------------------------------------------------------------------------------------------------------- Diversified REIT -- 0.7% 145,212 Lar Espana Real Estate Socimi SA $ 1,437,626 263,488 Merlin Properties Socimi SA 3,303,209 ------------ $ 4,740,835 ----------------------------------------------------------------------------------------------------------------- Hotel & Resort REIT -- 0.3% 26,685 Ryman Hospitality Properties, Inc. $ 2,070,489 ----------------------------------------------------------------------------------------------------------------- Real Estate Development -- 1.7% 1,096,000 China Resources Land, Ltd. $ 3,718,073 1,670,000 KWG Property Holding, Ltd. 1,275,760 916,500 Longfor Properties Co., Ltd. 2,225,488 999,000 Shimao Property Holdings, Ltd. 1,954,414 805,477(a) Vinhomes JSC (144A) 2,290,963 ------------ $ 11,464,698 ----------------------------------------------------------------------------------------------------------------- Real Estate Operating Companies -- 1.7% 72,095 Deutsche Wohnen SE $ 3,298,767 114,059 Grand City Properties SA 2,759,133 108,006 Vonovia SE 4,939,461 ------------ $ 10,997,361 ----------------------------------------------------------------------------------------------------------------- Real Estate Services -- 0.2% 2,802,000(a) Colour Life Services Group Co., Ltd. $ 1,347,210 ------------ Total Real Estate $ 31,269,964 ----------------------------------------------------------------------------------------------------------------- RETAILING -- 1.0% Home Improvement Retail -- 0.4% 12,913 Home Depot, Inc. $ 2,271,139 ----------------------------------------------------------------------------------------------------------------- Homefurnishing Retail -- 0.1% 28,889 Maisons du Monde SA (144A) $ 723,678 ----------------------------------------------------------------------------------------------------------------- Specialty Stores -- 0.5% 31,227 Tiffany & Co. $ 3,475,565 ------------ Total Retailing $ 6,470,382 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 24 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 ----------------------------------------------------------------------------------------------------------------- Shares Value ----------------------------------------------------------------------------------------------------------------- SOFTWARE & SERVICES -- 5.2% Application Software -- 1.2% 10,586(a) Adobe Systems, Inc. $ 2,601,615 107,135(a) Envestnet, Inc. 5,573,162 ------------ $ 8,174,777 ----------------------------------------------------------------------------------------------------------------- Data Processing & Outsourced Services -- 0.9% 102,426(a) First Data Corp. $ 1,919,463 19,875 Mastercard, Inc. 3,928,692 ------------ $ 5,848,155 ----------------------------------------------------------------------------------------------------------------- Internet Services & Infrastructure -- 0.2% 53,432(a) iQIYI, Inc. (A.D.R.) $ 1,049,404 ----------------------------------------------------------------------------------------------------------------- IT Consulting & Other Services -- 1.7% 186,520 Booz Allen Hamilton Holding Corp. $ 9,240,201 16,484 Capgemini SE 2,014,289 ------------ $ 11,254,490 ----------------------------------------------------------------------------------------------------------------- Systems Software -- 1.2% 72,583 Microsoft Corp. $ 7,752,590 ------------ Total Software & Services $ 34,079,416 ----------------------------------------------------------------------------------------------------------------- TECHNOLOGY HARDWARE & EQUIPMENT -- 1.5% Communications Equipment -- 1.0% 45,080 Harris Corp. $ 6,703,847 ----------------------------------------------------------------------------------------------------------------- Electronic Components -- 0.5% 21,411 Amphenol Corp. $ 1,916,284 122,500 Sunny Optical Technology Group Co., Ltd. 1,062,358 ------------ $ 2,978,642 ------------ Total Technology Hardware & Equipment $ 9,682,489 ----------------------------------------------------------------------------------------------------------------- TRANSPORTATION -- 0.1% Highways & Railtracks -- 0.1% 1,092,000 Shenzhen Expressway Co., Ltd., Class H $ 1,004,115 ------------ Total Transportation $ 1,004,115 ----------------------------------------------------------------------------------------------------------------- UTILITIES -- 0.7% Electric Utilities -- 0.3% 278,000 CK Infrastructure Holdings, Ltd. $ 2,031,539 ----------------------------------------------------------------------------------------------------------------- Renewable Electricity -- 0.4% 3,627,000 China Everbright Greentech, Ltd. (144A) $ 2,608,870 ------------ Total Utilities $ 4,640,409 ----------------------------------------------------------------------------------------------------------------- TOTAL COMMON STOCKS (Cost $532,807,783) $517,151,978 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 25 Schedule of Investments | 10/31/18 (Consolidated) (continued) ----------------------------------------------------------------------------------------------------------------- Shares Value ----------------------------------------------------------------------------------------------------------------- PREFERRED STOCK -- 0.1% of Net Assets REAL ESTATE -- 0.1% Retail REIT -- 0.1% 204^ Wheeler Real Estate Investment Trust, Inc. $ 143,808 ------------ Total Real Estate $ 143,808 ----------------------------------------------------------------------------------------------------------------- TOTAL PREFERRED STOCK (Cost $195,245) $ 143,808 ----------------------------------------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------------------------------- Principal Amount USD ($) ----------------------------------------------------------------------------------------------------------------- CORPORATE BONDS -- 4.1% of Net Assets BANKS -- 1.5% Diversified Banks -- 1.5% 2,301,000(b) Banco do Brasil SA, 3.875%, 10/10/22 $ 2,182,522 4,500,000 Industrial & Commercial Bank of China, Ltd., 3.538%, 11/8/27 4,193,770 3,804,000(c)(d) Intesa Sanpaolo S.p.A., 7.7% (5 Year USD Swap Rate + 546 bps) (144A) 3,447,375 ------------ Total Banks $ 9,823,667 ----------------------------------------------------------------------------------------------------------------- ENERGY -- 0.6% Integrated Oil & Gas -- 0.6% 3,798,000 Petrobras Global Finance BV, 4.375%, 5/20/23 $ 3,663,171 ------------ Total Energy $ 3,663,171 ----------------------------------------------------------------------------------------------------------------- MATERIALS -- 1.4% Commodity Chemicals -- 0.3% 2,081,000(b) Braskem Finance, Ltd., 6.45%, 2/3/24 $ 2,183,489 ----------------------------------------------------------------------------------------------------------------- Diversified Metals & Mining -- 0.7% 2,000,000 Anglo American Capital Plc, 4.75%, 4/10/27 (144A) $ 1,925,648 2,637,000 MMC Norilsk Nickel OJSC via MMC Finance, DAC, 4.1%, 4/11/23 (144A) 2,491,965 ------------ $ 4,417,613 ----------------------------------------------------------------------------------------------------------------- Paper Packaging -- 0.4% 3,000,000 Sealed Air Corp., 5.125%, 12/1/24 (144A) $ 2,917,500 ------------ Total Materials $ 9,518,602 ----------------------------------------------------------------------------------------------------------------- TELECOMMUNICATION SERVICES -- 0.6% Alternative Carriers -- 0.6% 4,400,000 CenturyLink, Inc., 7.65%, 3/15/42 $ 3,784,000 ------------ Total Telecommunication Services $ 3,784,000 ----------------------------------------------------------------------------------------------------------------- TOTAL CORPORATE BONDS (Cost $27,413,249) $ 26,789,440 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 26 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 ----------------------------------------------------------------------------------------------------------------- Principal Amount USD ($) Value ----------------------------------------------------------------------------------------------------------------- FOREIGN GOVERNMENT BONDS -- 3.3% of Net Assets Argentina -- 0.5% 4,500,000 Argentine Republic Government International Bond, 5.875%, 1/11/28 $ 3,465,000 ----------------------------------------------------------------------------------------------------------------- Brazil -- 0.8% 5,280,000 Brazilian Government International Bond, 4.25%, 1/7/25 $ 5,097,101 ----------------------------------------------------------------------------------------------------------------- Indonesia -- 1.4% 9,434,000 Indonesia Government International Bond, 3.375%, 4/15/23 (144A) $ 9,017,734 ----------------------------------------------------------------------------------------------------------------- Russia -- 0.5% 3,400,000 Russian Foreign Bond - Eurobond, 4.875%, 9/16/23 (144A) $ 3,476,398 ----------------------------------------------------------------------------------------------------------------- Turkey -- 0.1% TRY 4,250,000 Turkey Government Bond, 8.5%, 7/10/19 $ 695,483 ----------------------------------------------------------------------------------------------------------------- TOTAL FOREIGN GOVERNMENT BONDS (Cost $22,142,636) $ 21,751,716 ----------------------------------------------------------------------------------------------------------------- U.S. GOVERNMENT AND AGENCY OBLIGATIONS -- 2.6% of Net Assets 8,680,000(e) U.S. Treasury Bills, 11/8/18 $ 8,676,473 8,240,000(e) U.S. Treasury Bills, 11/23/18 8,229,167 ----------------------------------------------------------------------------------------------------------------- TOTAL U.S. GOVERNMENT AND AGENCY OBLIGATIONS (Cost $16,905,514) $ 16,905,640 ----------------------------------------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------------------------------- Shares ----------------------------------------------------------------------------------------------------------------- INVESTMENT COMPANIES -- 4.2% of Net Assets DIVERSIFIED FINANCIALS -- 4.2% Diversified Capital Markets -- 3.6% 607,873 ETFMG Prime Cyber Security ETF $ 21,895,586 62,296 Invesco International BuyBack Achievers ETF 1,929,307 ------------ $ 23,824,893 ----------------------------------------------------------------------------------------------------------------- Other Diversified Financial Services -- 0.3% 82,370 SPDR S&P Euro Dividend Aristocrats UCITS ETF $ 2,008,407 ----------------------------------------------------------------------------------------------------------------- Specialized Finance -- 0.3% 120,057 VanEck Vectors Vietnam ETF $ 1,822,465 ------------ Total Diversified Financials $ 27,655,765 ----------------------------------------------------------------------------------------------------------------- TOTAL INVESTMENT COMPANIES (Cost $28,799,964) $ 27,655,765 ----------------------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 27 Schedule of Investments | 10/31/18 (Consolidated) (continued) ----------------------------------------------------------------------------------------------------------------- Shares Value ----------------------------------------------------------------------------------------------------------------- EXCHANGE-TRADED COMMODITY -- 0.1% of Net Assets DIVERSIFIED FINANCIALS -- 0.1% Asset Management & Custody Banks -- 0.1% 3,411(a)(b) Xtrackers Physical Rhodium ETC $ 689,022 ------------ Total Diversified Financials $ 689,022 ----------------------------------------------------------------------------------------------------------------- TOTAL EXCHANGE-TRADED COMMODITY (Cost $534,086) $ 689,022 ----------------------------------------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------------------------------- Number of Strike Expiration Contracts Description Counterparty Notional Price Date ----------------------------------------------------------------------------------------------------------------- EXCHANGE-TRADED CALL OPTIONS PURCHASED -- 0.4% 2,000 Blue Apron Citigroup Global USD 266,000 USD 7 1/18/19 $ 15,000 Holdings, Inc. Markets, Inc. 8,690 Euro Stoxx Citibank NA EUR 1,383,519 EUR 170 3/15/19 245,808 600 Index 20,000 KKR & Co. LP Citigroup Global USD 1,216,400 USD 25 1/18/19 1,800,000 Markets, Inc. 10,000 Selected Citigroup Global USD 750,000 USD 27 1/18/19 660,000 Sector SPDR Markets, Inc. ------------ $ 2,720,808 ----------------------------------------------------------------------------------------------------------------- TOTAL EXCHANGE-TRADED CALL OPTIONS PURCHASED (Premiums paid $3,615,919) $ 2,720,808 ----------------------------------------------------------------------------------------------------------------- EXCHANGE-TRADED PUT OPTION PURCHASED -- 0.0%+ 25,392 Deutsche Barclays EUR 624,600 EUR 7 12/21/18 $ 287,298 Bank AG Capital ----------------------------------------------------------------------------------------------------------------- TOTAL EXCHANGE-TRADED PUT OPTION PURCHASED (Premiums paid $624,600) $ 287,298 ----------------------------------------------------------------------------------------------------------------- OVER THE COUNTER (OTC) CALL OPTIONS PURCHASED -- 1.3% 31,571 Euro Stoxx 50 Citibank NA EUR 3,001,680 EUR 3,559 6/21/19 $ 492,214 4,361 FTSE 100 Index Citibank NA GBP 766,532 GBP 7,622 1/21/19 128,402 3,270 FTSE 100 Index Citigroup Global GBP 839,711 GBP 7,697 3/15/19 130,535 Markets, Inc. 81,777 MSCI Emerging Citibank NA USD 4,999,985 USD 1,126 7/19/19 1,010,494 Markets Index 1,844,500 MSCI China Citibank NA HKD 840,134 HKD 91 12/28/18 2,283 Index 53 Nikkei 225 Index Citibank NA JPY 668,728 JPY 21,298 9/13/19 818,100 234 Nikkei 225 Index Citibank NA JPY 1,786,726 JPY 23,504 9/13/19 1,581,189 126,150 Nikkei 225 Index JPMorgan JPY 1,096,201 JPY 21,656 8/9/19 1,649,114 Chase Bank NA The accompanying notes are an integral part of these financial statements. 28 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 ----------------------------------------------------------------------------------------------------------------- Number of Strike Expiration Contracts Description Counterparty Notional Price Date Value ----------------------------------------------------------------------------------------------------------------- OVER THE COUNTER (OTC) CALL OPTIONS PURCHASED -- (continued) 10,883 S&P 500 Index Citibank NA USD 960,042 USD 2,772 4/19/19 $ 1,104,299 11,342 S&P 500 Index Citibank NA USD 989,964 USD 2,742 4/19/19 1,313,942 ------------ $ 8,230,572 ----------------------------------------------------------------------------------------------------------------- TOTAL OVER THE COUNTER (OTC) CALL OPTIONS PURCHASED (Premiums paid $15,949,703) $ 8,230,572 ----------------------------------------------------------------------------------------------------------------- TOTAL OPTIONS PURCHASED (Premiums paid $20,190,222) $ 11,238,678 ----------------------------------------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------------------------------- Principal Amount USD ($) ----------------------------------------------------------------------------------------------------------------- TEMPORARY CASH INVESTMENTS -- 2.2% of Net Assets REPURCHASE AGREEMENTS -- 2.2% 1,360,000 $1,360,000 Merrill Lynch, Pierce, Fenner & Smith Inc., 2.2%, dated 10/31/18 plus accrued interest on 11/1/18 collateralized by $1,387,200 Government National Mortgage Association, 4.5%, 9/20/48 $ 1,360,000 6,910,000 $6,910,000 RBC Capital Markets LLC, 2.21%, dated 10/31/18 plus accrued interest on 11/1/18 collateralized by $7,048,633 Federal National Mortgage Association, 4.0%, 7/1/48 6,910,000 3,825,000 $3,825,000 ScotiaBank, 2.2%, dated 10/31/18 plus accrued interest on 11/1/18 collateralized by the following: $982,815 Freddie Mac Giant, 3.5%, 12/1/47 $2,918,924 Federal National Mortgage Association, 3.5% - 5.0%, 3/1/47 - 7/1/78 3,825,000 1,290,000 $1,290,000 TD Securities USA LLC, 2.19%, dated 10/31/18 plus accrued interest on 11/1/18 collateralized by $1,315,850 U.S. Treasury Notes, 2.25%, 1/31/24 1,290,000 1,290,000 $1,290,000 TD Securities USA LLC, 2.21%, dated 10/31/18 plus accrued interest on 11/1/18 collateralized by $1,315,850 U.S. Treasury Notes, 2.25%, 1/31/24 1,290,000 ------------ $ 14,675,000 ----------------------------------------------------------------------------------------------------------------- TOTAL TEMPORARY CASH INVESTMENTS (Cost $14,675,000) $ 14,675,000 ----------------------------------------------------------------------------------------------------------------- TOTAL INVESTMENTS IN UNAFFILIATED ISSUERS -- 96.8% (Cost $663,663,699) $637,001,047 ----------------------------------------------------------------------------------------------------------------- OTHER ASSETS AND LIABILITIES -- 3.2% $ 21,227,458 ----------------------------------------------------------------------------------------------------------------- NET ASSETS -- 100.0% $658,228,505 ================================================================================================================= The accompanying notes are an integral part of these financial statements. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 29 Schedule of Investments | 10/31/18 (Consolidated) (continued) bps Basis Points. REIT Real Estate Investment Trust. (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 October 31, 2018, the value of these securities amounted to $37,614,806, or 5.7% of net assets. (A.D.R.) American Depositary Receipts. + Amount rounds to less than 0.1%. ^ Security is valued using fair value methods (other than prices supplied by independent pricing services). See Notes to Financial Statements -- Note 1A. (a) Non-income producing security. (b) All or a portion of this security is held by Flexible Opportunities Commodity Fund Ltd. (formerly, Pioneer Cayman Commodity Fund Ltd.) (c) The interest rate is subject to change periodically. The interest rate and/or reference index and spread shown at October 31, 2018. (d) Security is perpetual in nature and has no stated maturity date. (e) Security issued with a zero coupon. Income is recognized through accretion of discount. Purchases and sales of securities (excluding temporary cash investments) for the year ended October 31, 2018, were as follows: -------------------------------------------------------------------------------- Purchases Sales -------------------------------------------------------------------------------- Long-Term U.S. Government $ 19,777,613 $ 19,907,516 Other Long-Term Securities $1,767,592,682 $1,686,074,694 The Fund is permitted to engage in purchase and sale transactions ("cross trades") with certain funds and accounts for which Amundi Pioneer Asset Management, Inc., (the "Adviser") serves as the Fund's investment adviser, as set forth in Rule 17a-7 under the Investment Company Act of 1940, pursuant to procedures adopted by the Board of Trustees. Under these procedures, cross trades are effected at current market prices. During the year ended October 31, 2018, the Fund did not engage in cross trade activity. At October 31, 2018, the net unrealized depreciation on investments based on cost for federal tax purposes of $676,385,677 was as follows: Aggregate gross unrealized appreciation for all investments in which there is an excess of value over tax cost $ 39,734,752 Aggregate gross unrealized depreciation for all investments in which there is an excess of tax cost over value (68,611,109) ------------ Net unrealized depreciation $(28,876,357) ============ The accompanying notes are an integral part of these financial statements. 30 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 FUTURES CONTRACTS CURRENCY FUTURES CONTRACTS ------------------------------------------------------------------------------------------------- Number of Contracts Expiration Notional Market Unrealized Short Description Date Amount Value Appreciation ------------------------------------------------------------------------------------------------- 318 EURO 12/17/18 $ 46,629,557 $ 45,138,113 $ 1,491,444 237 Great British 12/17/18 19,485,844 18,954,075 531,769 Pound ------------------------------------------------------------------------------------------------- $ 66,115,401 $ 64,092,188 $ 2,023,213 ------------------------------------------------------------------------------------------------- INDEX FUTURES CONTRACTS ------------------------------------------------------------------------------------------------- Net Number of Unrealized Contracts Expiration Notional Market Appreciation Short Description Date Amount Value (Depreciation) ------------------------------------------------------------------------------------------------- 1,468 Euro Stoxx 50 12/21/18 $ 55,511,079 $ 53,051,336 $ 2,459,743 634 FTSE/JSE Top 40 12/20/18 22,033,167 19,961,426 2,071,741 183 FTSE/MIB 12/21/18 19,549,549 19,654,730 (105,181) 404 MSCI China Free 12/21/18 16,692,049 14,909,620 1,782,429 847 MSCI Emerging 12/21/18 43,982,836 40,516,245 3,466,591 Market 95 Nasdaq 100 12/21/18 13,195,947 13,253,450 (57,503) E-MINI ------------------------------------------------------------------------------------------------- $170,964,627 $161,346,807 $ 9,617,820 ------------------------------------------------------------------------------------------------- TOTAL FUTURES CONTRACTS $237,080,028 $225,438,995 $11,641,033 ================================================================================================= SWAP CONTRACTS OVER THE COUNTER (OTC) TOTAL RETURN SWAP CONTRACTS -- SELL PROTECTION ---------------------------------------------------------------------------------------------------------------------- Notional Obligation Pay/ Expiration Unrealized Market Amount(1) Counterparty Reference/Index Receive(2) Coupon Date Depreciation Value ---------------------------------------------------------------------------------------------------------------------- 26,483 Goldman Goldman Sachs Pay 3M LIBOR + 11/26/18 $ (397,509) $ (397,509) Sachs Total Cash 39bps International Return Index* 87,810 Goldman Goldman Sachs Pay 3M LIBOR + 5/1/19 (735,251) (735,251) Sachs Total Cash 39bps International Return Index* ---------------------------------------------------------------------------------------------------------------------- TOTAL SWAPS CONTRACTS $(1,132,760) $(1,132,760) ====================================================================================================================== (1) The notional amount is the maximum amount that a seller of credit protection would be obligated to pay upon occurrence of a credit event. (2) Pays Quarterly. Principal amounts are denominated in U.S. dollars ("USD") unless otherwise noted. EUR -- Euro GBP -- Great British Pound HKD -- Hong Kong Dollar JPY -- Japanese Yen TRY -- Turkish Lira The accompanying notes are an integral part of these financial statements. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 31 Schedule of Investments | 10/31/18 (Consolidated) (continued) * The following table shows the individual positions and related values of the securities underlying each total return swap with Goldman Sachs International, as of October 31, 2018. -------------------------------------------------------------------------------------- Index Description Shares Value % of basket -------------------------------------------------------------------------------------- AbbVie Inc. 306 $ (23,860) 2.11% AES Corp. 1,787 (26,052) 2.30% American Airlines Group, Inc. 474 (16,634) 1.47% American International Group, Inc. 332 (13,699) 1.21% Ameriprise Financial, Inc 158 (20,112) 1.78% AmerisourceBergen Corp. 246 (21,674) 1.91% Apple, Inc. 141 (30,791) 2.72% Applied Materials, Inc. 498 (16,363) 1.44% Archer-Daniels-Midland Co. 442 (20,872) 1.84% Assurant, Inc. 210 (20,413) 1.80% Boeing Co. 109 (38,801) 3.43% Capital One Financial Corp. 251 (22,452) 1.98% CBS Corp. 304 (17,413) 1.54% CenturyLink, Inc. 787 (16,249) 1.43% Corning, Inc. 700 (22,384) 1.98% DENTSPLY SIRONA, Inc. 320 (11,067) 0.98% Discover Financial Services 323 (22,495) 1.99% eBay, Inc. 605 (17,560) 1.55% Equity Residential 313 (20,328) 1.79% Express Scripts Holding Co 329 (31,948) 2.82% F5 Networks, Inc. 157 (27,431) 2.42% General Electric Co. 697 (7,041) 0.62% Gilead Sciences, Inc. 295 (20,100) 1.77% HCA Healthcare, Inc. 240 (32,045) 2.83% HP, Inc. 1,074 (25,922) 2.29% LyondellBasell Industries NV 238 (21,285) 1.88% McDonald's Corp. 144 (25,549) 2.26% Michael Kors Holdings, Ltd. 541 (29,997) 2.65% Monster Beverage Corp. 445 (23,536) 2.08% Motorola Solutions, Inc. 235 (28,811) 2.54% Navient Corp. 1,330 (15,396) 1.36% NetApp, Inc. 507 (39,804) 3.52% NRG Energy, Inc. 1,196 (43,276) 3.82% ONEOK, Inc. 384 (25,199) 2.22% Procter & Gamble Co. 231 (20,522) 1.81% PulteGroup, Inc. 891 (21,903) 1.93% Qorvo, Inc. 297 (21,837) 1.93% Quest Diagnostics, Inc. 192 (18,026) 1.59% Seagate Technology PLC 480 (19,298) 1.70% Sysco Corp. 382 (27,266) 2.41% Target Corp. 362 (30,261) 2.67% TransDigm Group, Inc. 82 (27,050) 2.39% The accompanying notes are an integral part of these financial statements. 32 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 -------------------------------------------------------------------------------------- Index Description Shares Value % of basket -------------------------------------------------------------------------------------- Tyson Foods, Inc. 314 $ (18,845) 1.66% United Continental Holdings, Inc. 288 (24,613) 2.17% Valero Energy Corp. 313 (28,492) 2.52% Western Union Co. 1,018 (18,357) 1.62% Weyerhaeuser Co. 597 (15,889) 1.40% Williams Cos, Inc. 660 (16,053) 1.42% Yum! Brands, Inc. 307 (27,789) 2.45% -------------------------------------------------------------------------------------- Totals $(1,132,760) 100.00% ====================================================================================== Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels 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 risks, etc.). See Notes to Financial Statements -- Note 1A. Level 3 - significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments). See Notes to Financial Statements -- Note 1A. The following is a summary of the inputs used as of October 31, 2018, in valuing the Fund's investments. ---------------------------------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total ---------------------------------------------------------------------------------------------------------- Common Stocks $517,151,978 $ -- $ -- $517,151,978 Preferred Stock Real Estate Retail REIT -- -- 143,808 143,808 Corporate Bonds -- 26,789,440 -- 26,789,440 Foreign Government Bonds -- 21,751,716 -- 21,751,716 U.S. Government and Agency Obligations -- 16,905,640 -- 16,905,640 Investment Companies 27,655,765 -- -- 27,655,765 Exchange-Traded Commodity 689,022 -- -- 689,022 Exchange-Traded Call Options Purchased 2,720,808 -- -- 2,720,808 Exchange-Traded Put Option Purchased 287,298 -- -- 287,298 Over The Counter (OTC) Call Options Purchased -- 8,230,572 -- 8,230,572 Repurchase Agreements -- 14,675,000 -- 14,675,000 ---------------------------------------------------------------------------------------------------------- Total Investments in Securities $548,504,871 $88,352,368 $143,808 $637,001,047 ---------------------------------------------------------------------------------------------------------- Other Financial Instruments Net unrealized appreciation on futures contracts 11,641,033 -- -- 11,641,033 Swap contracts, at value -- (1,132,760) -- (1,132,760) ---------------------------------------------------------------------------------------------------------- Total Other Financial Instruments $ 11,641,033 $(1,132,760) $ -- $ 10,508,273 ========================================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 33 Schedule of Investments | 10/31/18 (Consolidated) (continued) The following is a reconciliation of assets valued using significant unobservable inputs (Level 3): -------------------------------------------------------------------------------- Preferred Stock -------------------------------------------------------------------------------- Balance as of 10/31/17 $161,195 Realized gain (loss)(1) -- Changed in unrealized appreciation (depreciation)(2) (17,387) Accrued discounts/premiums -- Purchases -- Sales -- Transfers in to Level 3* -- Transfers out of Level 3* -- -------------------------------------------------------------------------------- Balance as of 10/31/18 $143,808 ================================================================================ (1) Realized gain (loss) on these securities is included in the realized gain (loss) on investments on the Statement of Operations. (2) Unrealized appreciation (depreciation) on these securities is included in the change in unrealized appreciation (depreciation) on investments on the Statement of Operations. * Transfers are calculated on the beginning of period values. During the year ended October 31, 2018, there were no transfers between Levels 1, 2 and 3. Net change in unrealized appreciation (depreciation) of Level 3 investments still held and considered Level 3 at October 31, 2018: $(17,387) -------- The accompanying notes are an integral part of these financial statements. 34 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 Statement of Assets and Liabilities | 10/31/18 (Consolidated) ASSETS: Investments in unaffiliated issuers, at value (cost $663,663,699) $637,001,047 Cash 3,668,806 Foreign currencies, at value (cost $14,706,609) 14,581,149 Futures collateral 15,400,500 Swap collateral 1,540,000 Net unrealized appreciation on futures contracts 11,641,033 Receivables -- Fund shares sold 740,718 Dividends 612,992 Interest 554,754 Due from the Adviser 55,460 Other assets 205,252 --------------------------------------------------------------------------------------------- Total assets $686,001,711 ============================================================================================= LIABILITIES: Payables -- Investment securities purchased $ 5,936,239 Fund shares repurchased 2,223,989 Distributions 774 Trustees' fees 3,847 Options collateral 1,290,000 Due to broker 2,262,401 Due to broker for futures and options 11,814,926 Variation margin for futures contracts 2,694,665 Swap contracts, at value 1,132,760 Due to affiliates 84,346 Accrued expenses 329,259 --------------------------------------------------------------------------------------------- Total liabilities $ 27,773,206 ============================================================================================= NET ASSETS: Paid-in capital $624,869,782 Distributable earnings 33,358,723 --------------------------------------------------------------------------------------------- Net assets $658,228,505 ============================================================================================= NET ASSET VALUE PER SHARE: No par value (unlimited number of shares authorized) Class A (based on $142,760,281/11,254,259 shares) $ 12.69 Class C (based on $122,304,682/9,823,312 shares) $ 12.45 Class K (based on $69,449,042/5,474,846 shares) $ 12.69 Class R (based on $302,598/24,007 shares) $ 12.60 Class Y (based on $323,411,902/25,385,119 shares) $ 12.74 MAXIMUM OFFERING PRICE: Class A (based on $12.69 net asset value per share/100%-4.50% maximum sales charge) $ 13.29 ============================================================================================= The accompanying notes are an integral part of these financial statements. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 35 Statement of Operations (Consolidated) FOR THE YEAR ENDED 10/31/18 INVESTMENT INCOME: Dividends from unaffiliated issuers (net of foreign taxes withheld $988,342) $ 15,111,227 Interest from unaffiliated issuers 3,744,267 ------------------------------------------------------------------------------------------------------ Total investment income $ 18,855,494 ------------------------------------------------------------------------------------------------------ EXPENSES: Management fees $ 5,206,035 Administrative expense 257,723 Transfer agent fees Class A 75,506 Class C 99,009 Class R 1,184 Class Y 405,700 Distribution fees Class A 384,089 Class C 1,428,522 Class R 1,652 Shareowner communications expense 55,398 Custodian fees 312,683 Registration fees 96,932 Professional fees 116,338 Printing expense 25,339 Pricing fees 5,627 Trustees' fees 32,311 Insurance expense 8,026 Miscellaneous 82,258 ------------------------------------------------------------------------------------------------------ Total expenses $ 8,594,332 Less fees waived and expenses reimbursed by the Adviser (97,307) ------------------------------------------------------------------------------------------------------ Net expenses $ 8,497,025 ------------------------------------------------------------------------------------------------------ Net investment income $ 10,358,469 ------------------------------------------------------------------------------------------------------ REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS: Net realized gain (loss) on: Investments in unaffiliated issuers $ 51,002,833 Futures contracts (5,517,234) Swap contracts 8,742,805 Other assets and liabilities denominated in foreign currencies (1,331,833) $ 52,896,571 ------------------------------------------------------------------------------------------------------ Change in net unrealized appreciation (depreciation) on: Investments in unaffiliated issuers $(94,868,422) Futures contracts 14,644,450 Swap contracts (3,069,395) Other assets and liabilities denominated in foreign currencies (198,694) $(83,492,061) ------------------------------------------------------------------------------------------------------ Net realized and unrealized gain (loss) on investments $(30,595,490) ------------------------------------------------------------------------------------------------------ Net increase in net assets resulting from operations $(20,237,021) ====================================================================================================== The accompanying notes are an integral part of these financial statements. 36 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 Statements of Changes in Net Assets (Consolidated) ---------------------------------------------------------------------------------------------------------- Year Ended Year Ended 10/31/18 10/31/17 ---------------------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income (loss) $ 10,358,469 $ 6,674,156 Net realized gain (loss) on investments 52,896,571 61,804,939 Change in net unrealized appreciation (depreciation) on investments (83,492,061) 39,928,961 ---------------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets resulting from operations $ (20,237,021) $ 108,408,056 ---------------------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS:** Class A ($1.23 and $0.12 per share, respectively) $ (12,321,509) $ (1,416,002) Class C ($1.15 and $0.06 per share, respectively) (12,164,041) (820,498) Class K* ($0.04 and $-- per share, respectively) (235,303) -- Class R ($1.18 and $0.08 per share, respectively) (23,045) (2,157) Class Y ($1.26 and $0.16 per share, respectively) (34,491,439) (4,306,248) ---------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (59,235,337) $ (6,544,905) ========================================================================================================== FROM FUND SHARE TRANSACTIONS: Net proceeds from sales of shares $ 416,332,043 $ 127,803,029 Reinvestment of distributions 50,052,246 5,535,308 Cost of shares repurchased (387,377,293) (267,730,775) ---------------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets resulting from Fund share transactions $ 79,006,996 $(134,392,438) ---------------------------------------------------------------------------------------------------------- Net decrease in net assets $ (465,362) $ (32,529,287) NET ASSETS:*** Beginning of year $ 658,693,867 $ 691,223,154 ---------------------------------------------------------------------------------------------------------- End of year $ 658,228,505 $ 658,693,867 ========================================================================================================== * Class K shares commenced operations on June 22, 2018. ** For the year ended October 31, 2017 Distributions to Shareowners was presented as follows: Net investment income: Class A ($0.12 per share) $ (1,416,002) Class C ($0.06 per share) (820,498) Class K ($0.00 per share) -- Class R ($0.08 per share) (2,157) Class Y ($0.16 per share) (4,306,248) *** For the year ended October 31, 2017 undistributed net investment income was presented as follows: $3,466,674 The accompanying notes are an integral part of these financial statements. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 37 Statements of Changes in Net Assets (Consolidated) (continued) ------------------------------------------------------------------------------------------------------------ Year Ended Year Ended Year Ended Year Ended 10/31/18 10/31/18 10/31/17 10/31/17 Shares Amount Shares Amount ------------------------------------------------------------------------------------------------------------ Class A Shares sold 5,191,038 $ 71,343,681 1,560,400 $ 19,940,069 Reinvestment of distributions 815,397 10,960,003 100,053 1,248,365 Less shares repurchased (4,654,378) (63,474,073) (5,467,662) (68,177,267) ------------------------------------------------------------------------------------------------------------ Net increase (decrease) 1,352,057 $ 18,829,611 (3,807,209) $ (46,988,833) ============================================================================================================ Class C Shares sold 1,547,855 $ 20,844,972 727,136 $ 9,039,802 Reinvestment of distributions 754,210 9,956,786 53,726 643,644 Less shares repurchased (3,128,303) (42,138,973) (5,156,033) (64,137,045) ------------------------------------------------------------------------------------------------------------ Net decrease (826,238) $ (11,337,215) (4,375,171) $ (54,453,599) ============================================================================================================ Class K* Shares sold 5,985,981 $ 80,532,422 -- $ -- Reinvestment of distributions -- -- -- -- Less shares repurchased (511,135) (6,893,926) -- -- ------------------------------------------------------------------------------------------------------------ Net increase 5,474,846 $ 73,638,496 -- $ -- ============================================================================================================ Class R Shares sold 10,792 $ 147,330 8,525 $ 103,330 Reinvestment of distributions 538 7,201 70 841 Less shares repurchased (7,077) (94,835) (12,309) (151,715) ------------------------------------------------------------------------------------------------------------ Net increase (decrease) 4,253 $ 59,696 (3,714) $ (47,544) ============================================================================================================ Class Y Shares sold 17,504,887 $ 243,463,638 7,774,087 $ 98,719,828 Reinvestment of distributions 2,157,757 29,128,256 288,109 3,642,458 Less shares repurchased (20,262,452) (274,775,486) (10,856,968) (135,264,748) ------------------------------------------------------------------------------------------------------------ Net decrease (599,808) $ (2,183,592) (2,794,772) $ (32,902,462) ============================================================================================================ * Class K shares commenced operations on June 22, 2018. The accompanying notes are an integral part of these financial statements. 38 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 Financial Highlights (Consolidated) ------------------------------------------------------------------------------------------------------------------------------------ Year Year Year Year Year Ended Ended Ended Ended Ended 10/31/18 10/31/17 10/31/16* 10/31/15* 10/31/14* ------------------------------------------------------------------------------------------------------------------------------------ Class A Net asset value, beginning of period $ 14.17 $ 12.03 $ 12.68 $ 12.94 $ 13.33 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) $ 0.19(a) $ 0.14(a) $ 0.16(a) $ 0.17(a) $ 0.27 Net realized and unrealized gain (loss) on investments (0.44) 2.12 (0.07) 0.20 (0.09) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (0.25) $ 2.26 $ 0.09 $ 0.37 $ 0.18 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.35) $ (0.12) $ (0.18) $ (0.30) $ (0.08) Net realized gain (0.88) -- (0.56) (0.33) (0.49) ------------------------------------------------------------------------------------------------------------------------------------ Total distributions $ (1.23) $ (0.12) $ (0.74) $ (0.63) $ (0.57) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (1.48) $ 2.14 $ (0.65) $ (0.26) $ (0.39) ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 12.69 $ 14.17 $ 12.03 $ 12.68 $ 12.94 ==================================================================================================================================== Total return (b) (2.08)% 18.96% 0.88% 2.85% 1.45% Ratio of net expenses to average net assets (c) 1.14% 1.18% 1.19% 1.20% 1.23% Ratio of net investment income (loss) to average net assets 1.35% 1.08% 1.38% 1.33% 1.60% Portfolio turnover rate 255% 292% 230% 295% 383% Net assets, end of period (in thousands) $142,760 $140,278 $164,898 $209,001 $227,251 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Total expenses to average net assets (c) 1.14% 1.18% 1.19% 1.26% 1.23% Net investment income (loss) to average net assets 1.35% 1.08% 1.38% 1.27% 1.60% ==================================================================================================================================== * The Fund was audited by an independent registered public accounting firm other than Ernst & Young LLP. (a) The per-share data presented above is based on the average shares outstanding for the period presented. (b) 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. (c) Includes interest expense of 0.00%, 0.00%, 0.00%, 0.00% and 0.05%, respectively. The accompanying notes are an integral part of these financial statements. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 39 Financial Highlights (Consolidated) (continued) ------------------------------------------------------------------------------------------------------------------------------------ Year Year Year Year Year Ended Ended Ended Ended Ended 10/31/18 10/31/17 10/31/16* 10/31/15* 10/31/14* ------------------------------------------------------------------------------------------------------------------------------------ Class C Net asset value, beginning of period $ 13.95 $ 11.88 $ 12.56 $ 12.78 $ 13.21 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) $ 0.07(a) $ 0.04(a) $ 0.07(a) $ 0.07(a) $ 0.13 Net realized and unrealized gain (loss) on investments (0.42) 2.09 (0.07) 0.20 (0.05) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (0.35) $ 2.13 $ -- $ 0.27 $ 0.08 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.27) $ (0.06) $ (0.12) $ (0.16) $ (0.02) Net realized gain (0.88) -- (0.56) (0.33) (0.49) ------------------------------------------------------------------------------------------------------------------------------------ Total distributions $ (1.15) $ (0.06) $ (0.68) $ (0.49) $ (0.51) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (1.50) $ 2.07 $ (0.68) $ (0.22) $ (0.43) ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 12.45 $ 13.95 $ 11.88 $ 12.56 $ 12.78 ==================================================================================================================================== Total return (b) (2.83)% 18.01% 0.09% 2.12% 0.60% Ratio of net expenses to average net assets (c) 1.91% 1.93% 1.94% 2.01% 1.97% Ratio of net investment income (loss) to average net assets 0.55% 0.34% 0.63% 0.52% 0.89% Portfolio turnover rate 255% 292% 230% 295% 383% Net assets, end of period (in thousands) $122,305 $148,591 $178,457 $218,597 $238,164 ==================================================================================================================================== * The Fund was audited by an independent registered public accounting firm other than Ernst & Young LLP. (a) The per-share data presented above is based on the average shares outstanding for the period presented. (b) 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. (c) Includes interest expense of 0.00%, 0.00%, 0.00%, 0.00% and 0.05%, respectively. The accompanying notes are an integral part of these financial statements. 40 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 ----------------------------------------------------------------------------------- 6/22/18* to 10/31/18 ----------------------------------------------------------------------------------- Class K Net asset value, beginning of period $ 13.67 ----------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (loss) $ 0.06(a) Net realized and unrealized gain (loss) on investments (1.00) ----------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (0.94) ----------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.04) Net realized gain -- ----------------------------------------------------------------------------------- Total distributions $ (0.04) ----------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (0.98) ----------------------------------------------------------------------------------- Net asset value, end of period $ 12.69 =================================================================================== Total return (b) (2.00)%(c) Ratio of net expenses to average net assets 0.88%(d) Ratio of net investment income (loss) to average net assets 1.28%(d) Portfolio turnover rate 255%(c) Net assets, end of period (in thousands) $69,449 =================================================================================== * Class K commenced operations on June 22, 2018. (a) The per-share data presented above is based on the average shares outstanding for the period presented. (b) 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. (c) Not annualized. (d) Annualized. The accompanying notes are an integral part of these financial statements. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 41 Financial Highlights (Consolidated) (continued) ------------------------------------------------------------------------------------------------------------------------------------ Year Year Year Year Year Ended Ended Ended Ended Ended 10/31/18 10/31/17 10/31/16* 10/31/15* 10/31/14* ------------------------------------------------------------------------------------------------------------------------------------ Class R Net asset value, beginning of period $14.11 $12.00 $12.69 $12.92 $13.32 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) $ 0.10(a) $ 0.08(a) $ 0.10(a) $ 0.06(a) $ 0.15 Net realized and unrealized gain (loss) on investments (0.43) 2.11 (0.08) 0.19 0.00(b) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $(0.33) $ 2.19 $ 0.02 $ 0.25 $ 0.15 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $(0.30) $(0.08) $(0.15) $(0.15) $(0.06) Net realized gain (0.88) -- (0.56) (0.33) (0.49) ------------------------------------------------------------------------------------------------------------------------------------ Total distributions $(1.18) $(0.08) $(0.71) $(0.48) $(0.55) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $(1.51) $ 2.11 $(0.69) $(0.23) $(0.40) ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $12.60 $14.11 $12.00 $12.69 $12.92 ==================================================================================================================================== Total return (c) (2.71)% 18.35% 0.34% 1.90% 1.19% Ratio of net expenses to average net assets (d) 1.82% 1.62% 1.71% 2.01% 1.55% Ratio of net investment income (loss) to average net assets 0.75% 0.64% 0.86% 0.47% 1.40% Portfolio turnover rate 255% 292% 230% 295% 383% Net assets, end of period (in thousands) $ 303 $ 279 $ 282 $ 120 $ 74 ==================================================================================================================================== * The Fund was audited by an independent registered public accounting firm other than Ernst & Young LLP. (a) The per-share data presented above is based on the average shares outstanding for the period presented. (b) Amount rounds to less than $0.01 or $(0.01) per share. (c) 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. (d) Includes interest expense of 0.00%, 0.00%, 0.00%, 0.00% and 0.05%, respectively. The accompanying notes are an integral part of these financial statements. 42 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------------------------------------ Year Year Year Year Year Ended Ended Ended Ended Ended 10/31/18 10/31/17 10/31/16* 10/31/15* 10/31/14* ------------------------------------------------------------------------------------------------------------------------------------ Class Y Net asset value, beginning of period $ 14.22 $ 12.08 $ 12.72 $ 12.97 $ 13.37 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) $ 0.24(a) $ 0.18(a) $ 0.20(a) $ 0.21(a) $ 0.27 Net realized and unrealized gain (loss) on investments (0.46) 2.12 (0.08) 0.20 (0.05) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (0.22) $ 2.30 $ 0.12 $ 0.41 $ 0.22 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.38) $ (0.16) $ (0.20) $ (0.33) $ (0.13) Net realized gain (0.88) -- (0.56) (0.33) (0.49) ------------------------------------------------------------------------------------------------------------------------------------ Total distributions $ (1.26) $ (0.16) $ (0.76) $ (0.66) $ (0.62) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (1.48) $ 2.14 $ (0.64) $ (0.25) $ (0.40) ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 12.74 $ 14.22 $ 12.08 $ 12.72 $ 12.97 ==================================================================================================================================== Total return (b) (1.86)% 19.24% 1.17% 3.20% 1.70% Ratio of net expenses to average net assets (c) 0.90% 0.90% 0.90% 0.90% 0.95% Ratio of net investment income (loss) to average net assets 1.71% 1.37% 1.65% 1.63% 1.92% Portfolio turnover rate 255% 292% 230% 295% 383% Net assets, end of period (in thousands) $323,412 $369,546 $347,586 $378,895 $401,336 Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Total expense to average net assets (c) 0.92% 0.95% 0.96% 1.02% 1.00% Net investment income (loss) to average net assets 1.69% 1.32% 1.59% 1.52% 1.92% ==================================================================================================================================== * The Fund was audited by an independent registered public accounting firm other than Ernst & Young LLP. (a) The per-share data presented above is based on the average shares outstanding for the period presented. (b) 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. (c) Includes interest expense of 0.00%, 0.00%, 0.00%, 0.00% and 0.05%, respectively. The accompanying notes are an integral part of these financial statements. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 43 Notes to Financial Statements | 10/31/18 (Consolidated) 1. Organization and Significant Accounting Policies Pioneer Flexible Opportunities Fund (the "Fund") is one of two portfolios comprising Pioneer Series Trust VI (the "Trust"), 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 total return. The Fund offers six classes of shares designated as Class A, Class C, Class K, Class R, Class T and Class Y shares. Class K commenced operations on June 22, 2018. Class T shares had not commenced operations as of October 31, 2018. 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 of Trustees the flexibility to specify either per-share voting or dollar-weighted voting when submitting matters for shareholder approval. Under per-share voting, each share of a class of the Fund is entitled to one vote. Under dollar-weighted voting, a shareholder's voting power is determined not by the number of shares owned, but by the dollar value of the shares on the record date. Each share class has exclusive voting rights with respect to matters affecting only that class, including with respect to the distribution plan for that class. There is no distribution plan for Class K and Class Y shares. Amundi Pioneer Asset Management, Inc., an indirect wholly owned subsidiary of Amundi and Amundi's wholly owned subsidiary, Amundi USA, Inc., serves as the Fund's investment adviser (the "Adviser"). Amundi Pioneer Distributor, Inc., an affiliate of Amundi Pioneer Asset Management, Inc., serves as the Fund's distributor (the "Distributor"). In August 2018, the SEC released a Disclosure Update and Simplification Final Rule. The Final Rule amends Regulation S-X disclosures requirements to conform them to U.S. Generally Accepted Accounting Principles ("U.S. GAAP") for investment companies. The Fund's financial statements were prepared in compliance with the new amendments to Regulation S-X. The consolidated financial statements of the Fund include the accounts of Flexible Opportunities Commodity Fund Ltd. (formerly, Pioneer Cayman Commodity Fund Ltd.) (the "Subsidiary"). All intercompany accounts and transactions have been eliminated. The Subsidiary, a Cayman Islands exempted 44 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 company, was incorporated on February 10, 2010, and is wholly-owned and controlled by the Fund. The Fund is the sole shareholder of the Subsidiary. It is intended that the Fund will remain the sole shareholder and will continue to control the Subsidiary. The Fund and the Subsidiary are both managed by the Adviser. The Subsidiary acts as an investment vehicle for the Fund in order to effect certain investments on behalf of the Fund. As of October 31, 2018, the Subsidiary represented $7,635,968, or approximately 1.16%, of the net assets of the Fund. The Fund is an investment company and follows investment company accounting and reporting guidance under U.S. GAAP. U.S. GAAP requires the management of the Fund to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of income, expenses and gain or loss on investments during the reporting period. Actual results could differ from those estimates. The following is a summary of significant accounting policies followed by the Fund in the preparation of its financial statements: A. Security Valuation 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. Equity securities that have traded on an exchange are valued by using 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 or, if both last bid and asked prices are not available, at the last quoted bid price. Last sale and bid and asked prices are provided by independent third party pricing services. In the case of equity securities not traded on an exchange, prices are typically determined by independent third party pricing services using a variety of techniques and methods. The value of foreign securities is translated into U.S. dollars based on foreign currency exchange rate quotations supplied by a third party pricing source. Trading in non-U.S. equity 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. The Fund may use a fair value model developed by an independent pricing service to value non-U.S. equity securities. Fixed-income securities are valued by using 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 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 45 ratings, or may use a pricing matrix or other fair value methods or techniques to provide an estimated value of the security or instrument. A pricing matrix is a means of valuing a debt security on the basis of current market prices for other debt securities, historical trading patterns in the market for fixed-income securities and/or other factors. Non-U.S. debt securities that are listed on an exchange will be valued at the bid price obtained from an independent third party pricing service. When independent third party pricing services are unable to supply prices, or when prices or market quotations are considered to be unreliable, the value of that security may be determined using quotations from one or more broker-dealers. Options contracts are generally valued at the mean between the last bid and ask prices on the principal exchange where they are traded. Over-the-counter ("OTC") options and options on swaps ("swaptions") are valued using 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, or may use a pricing matrix or other fair value methods or techniques to provide an estimated value of the security or instrument. Futures contracts are generally valued at the closing settlement price established by the exchange on which they are traded. Swap contracts, including interest rate swaps, caps and floors (other than centrally cleared swap contracts) are valued at the dealer quotations obtained from reputable International Swap Dealers Association members. Centrally cleared swaps are valued at the daily settlement price provided by the central clearing counterparty. Forward foreign currency exchange contracts are valued daily using the foreign exchange rate or, for longer-term forward contract positions, the spot currency rate and the forward points on a daily basis, in each case provided by a third party pricing service. Contracts whose forward settlement date falls between two quoted days are valued by interpolation. Shares of open-end registered investment companies (including money market mutual funds) are valued at such funds' net asset value. Shares of exchange-listed closed-end funds are valued by using the last sale price on the principal exchange where they are traded. Repurchase agreements are valued at par. Cash may include overnight time deposits at approved financial institutions. Securities for which independent pricing services or broker-dealers are unable to supply prices or for which market prices and/or quotations are not readily available or are considered to be unreliable are valued by a fair valuation team comprised of certain personnel of the Adviser pursuant to procedures adopted by the Fund's Board of Trustees. The Adviser's fair 46 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 valuation team uses fair value methods approved by the Valuation Committee of the Board of Trustees. The Adviser's fair valuation team is responsible for monitoring developments that may impact fair valued securities and for discussing and assessing fair values on an ongoing basis, and at least quarterly, with the Valuation Committee of the Board of Trustees. 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. The Fund may use fair value methods if it is determined that a significant event has occurred after the close of the exchange or market on which the security trades and prior to the determination of the Fund's net asset value. Examples of a significant event might include political or economic news, corporate restructurings, natural disasters, terrorist activity or trading halts. Thus, the valuation of the Fund's securities may differ significantly from exchange prices, and such differences could be material. At October 31, 2018, one security was valued using fair value methods (other than securities valued using prices supplied by independent pricing services, broker-dealers or using a third party insurance industry pricing model) representing 0.02% of net assets. The value of this valued security was $143,808. B. Investment Income and Transactions 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 and net of income accrued on defaulted securities. Interest and dividend income payable by delivery of additional shares is reclassified as PIK (payment-in-kind) income upon receipt and is included in interest and dividend income, respectively. Security transactions are recorded as of trade date. Gains and losses on sales of investments are calculated on the identified cost method for both financial reporting and federal income tax purposes. C. 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. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 47 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 on the Statement of Operations from the effects of changes in the market prices of those securities, but are included with the net realized and unrealized gain or loss on investments. 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 net taxable income and net realized capital gains, if any, to its shareowners. Therefore, no provision for federal income taxes is required. As of October 31, 2018, the Fund did not accrue any interest or penalties with respect to uncertain tax positions, which, if applicable, would be recorded as an income tax expense on the Statement of Operations. Tax returns filed within the prior three years remain subject to examination by federal and state tax authorities. The amount and character of income and capital gain distributions to shareowners are determined in accordance with federal income tax rules, which may differ from U.S. GAAP. Distributions in excess of net investment income or net realized gains are temporary over distributions for financial statement purposes resulting from differences in the recognition or classification of income or distributions for financial statement and tax purposes. Capital accounts within the financial statements are adjusted for permanent book/tax differences to reflect tax character, but are not adjusted for temporary differences. At October 31, 2018, the Fund reclassified $1,834,128 to increase distributable earnings and $1,834,128 to decrease paid-in capital to reflect permanent book/tax differences. These adjustments have no impact on net assets or the results of operations. The tax character of distributions paid during the years ended October 31, 2018 and October 31, 2017, were as follows: -------------------------------------------------------------------------- 2018 2017 -------------------------------------------------------------------------- Distributions paid from: Ordinary income $42,775,677 $6,544,905 Long Term 16,459,660 -- -------------------------------------------------------------------------- Total $59,235,337 $6,544,905 ========================================================================== 48 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 The following shows the components of distributable earnings on a federal income tax basis at October 31, 2018: -------------------------------------------------------------------------- 2018 -------------------------------------------------------------------------- Distributable earnings: Undistributed ordinary income $ 18,876,057 Undistributed long term capital gain 43,526,756 Unrealized depreciation (29,044,090) -------------------------------------------------------------------------- Total $ 33,358,723 ========================================================================== The difference between book-basis and tax-basis net unrealized depreciation is attributable to the tax deferral of losses on wash sales, adjustments related to the mark-to-market of futures contracts, tax basis adjustments on Real Estate Investment Trust ("REIT"), partnerships and swaps contracts. E. Fund Shares The Fund records sales and repurchases of its shares as of trade date. The Distributor earned $27,678 in underwriting commissions on the sale of Class A shares during the year ended October 31, 2018. 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, Class C and Class R shares of the Fund, respectively (see Note 4). Class K and Class Y shares do not pay distribution fees. All expenses and fees paid to the Fund's transfer agent 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 C, Class K, Class R and Class Y shares can reflect different transfer agent and distribution expense rates. G. Risks The value of securities held by the Fund may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic, political or regulatory conditions, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. In the past several years, financial markets have Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 49 experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. These conditions may continue, recur, worsen or spread. 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 investments in foreign markets and countries with limited developing markets may subject the Fund to a greater degree of risk than investments in a developed market. These risks include disruptive political or economic conditions and the imposition of adverse governmental laws or currency exchange restrictions. The Fund may gain exposure to commodities (such as oil and precious metals) through investment in commodity-related investments, including commodity-linked derivatives, ETFs and leveraged or unleveraged commodity-linked notes (derivative debt instruments with principal and/or coupon payments linked to the performance of commodity indices).The Fund also may invest in equity securities of issuers in commodity-related industries. The Fund's investments in commodity-related investments may subject the Fund to greater market price volatility than investments in traditional securities. The value of commodity-related investments may be affected by changes in overall market movements, commodity index volatility, changes in interest rates, or factors affecting particular industries or commodities, such as weather, disease, embargoes, acts of war or terrorism, or political and regulatory developments. Commodity-related investments may be more volatile than the underlying commodities. In addition, commodity-linked investments are subject to counterparty risk due to there being a relatively small number of issuers. The Fund gains exposure to commodity-related investments by investing in the Subsidiary, a foreign entity that is treated as a controlled foreign corporation for U.S. federal income tax purposes. The Fund may invest up to 25% of its total assets in the Subsidiary. The Fund's ability to invest in commodity-related investments, and the means through which any such investments may be made, is limited by tax considerations. The Fund may invest in REIT securities, the value of which can fall for a variety of reasons, such as declines in rental income, fluctuating interest rates, poor property management, environmental liabilities, uninsured damage, increased competition, or changes in real estate tax laws. Interest rates in the U.S. have been historically low and have begun to rise, so the Fund faces a heightened risk that interest rates may continue to rise. A general rise in interest rates could adversely affect the price and liquidity of fixed-income securities and could also result in increased redemptions from the Fund. 50 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 The Fund invests in below investment grade (high yield) debt securities and preferred stocks. Some of these high yield securities may be convertible into equity securities of the issuer. Debt securities rated below investment grade are commonly referred to as "junk bonds" and are considered speculative. These securities involve greater risk of loss, are subject to greater price volatility, and are less liquid, especially during periods of economic uncertainty or change, than higher rated debt securities. With the increased use of technologies such as the Internet to conduct business, the Fund is susceptible to operational, information security and related risks. While the Fund's Adviser has established business continuity plans in the event of, and risk management systems to prevent, limit or mitigate, such cyber-attacks, there are inherent limitations in such plans and systems including the possibility that certain risks have not been identified. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund such as Brown Brothers Harriman & Co., the Fund's custodian and accounting agent, and DST Asset Manager Solutions, Inc., the Fund's transfer agent. In addition, many beneficial owners of Fund shares hold them through accounts at broker-dealers, retirement platforms and other financial market participants over which neither the Fund nor Amundi Pioneer exercises control. Each of these may in turn rely on service providers to them, which are also subject to the risk of cyber-attacks. Cybersecurity failures or breaches at Amundi Pioneer or the Fund's service providers or intermediaries have the ability to cause disruptions and impact business operations, potentially resulting in financial losses, interference with the Fund's ability to calculate its net asset value, impediments to trading, the inability of Fund shareowners to effect share purchases, redemptions or exchanges or receive distributions, loss of or unauthorized access to private shareowners information and violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, or additional compliance costs. Such costs and losses may not be covered under any insurance. In addition, maintaining vigilance against cyber-attacks may involve substantial costs over time, and system enhancements may themselves be subject to cyber-attacks. 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. Repurchase Agreements Repurchase agreements are arrangements under which the Fund purchases securities from a broker-dealer or a bank, called the counterparty, upon the agreement of the counterparty to repurchase the securities from the Fund at a later date, and at a specific price, which is typically higher than the purchase price paid by the Fund. The securities purchased serve as the Fund's collateral Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 51 for the obligation of the counterparty to repurchase the securities. The value of the 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 sub-custodian of the Fund. The Adviser is responsible for determining that the value of the collateral remains at least equal to the repurchase price. In the event of a default by the counterparty, the Fund is entitled to sell the securities, but the Fund may not be able to sell them for the price at which they were purchased, thus causing a loss to the Fund. Additionally, if the counterparty becomes insolvent, there is some risk that the Fund will not have a right to the securities, or the immediate right to sell the securities. Open repurchase agreements as of October 31, 2018 are disclosed in the Fund's Schedule of Investments. I. Purchased Options The Fund may purchase put and call options to seek to increase total return. Purchased call and put options entitle the Fund to buy and sell a specified number of shares or units of a particular security, currency or index at a specified price at a specific date or within a specific period of time. Upon the purchase of a call or put option, the premium paid by the Fund is included on the Statement of Assets and Liabilities as an investment. All premiums are marked-to-market daily, and any unrealized appreciation or depreciation is recorded on the Fund's Statement of Operations. As the purchaser of an index option, the Fund has the right to receive a cash payment equal to any depreciation in the value of the index below the strike price of the option (in the case of a put) or equal to any appreciation in the value of the index over the strike price of the option (in the case of a call) as of the valuation date of the option. Premiums paid for purchased call and put options which have expired are treated as realized losses on investments on the Statement of Operations. Upon the exercise or closing of a purchased put option, the premium is offset against the proceeds on the sale of the underlying security or financial instrument in order to determine the realized gain or loss on investments. Upon the exercise or closing of a purchased call option, the premium is added to the cost of the security or financial instrument. The risk associated with purchasing options is limited to the premium originally paid. The average market value of purchased options contracts open during the year ended October 31, 2018 was $13,640,372. Open purchased options at October 31, 2018 are listed in the Fund's Schedule of Investments. J. Option Writing The Fund may write put and covered call options to seek to increase total return. When an option is written, the Fund receives a premium and becomes obligated to purchase or sell the underlying security at a fixed price, upon the 52 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 exercise of the option. When the Fund writes an option, an amount equal to the premium received by the Fund is recorded as "Written options outstanding" on the Statement of Assets and Liabilities and is subsequently adjusted to the current value of the option written. Premiums received from writing options that expire unexercised are treated by the Fund on the expiration date as realized gains from investments on the Statement of Operations. The difference between the premium and the amount paid on effecting a closing purchase transaction, including brokerage commissions, is also treated as a realized gain on the Statement of Operations, or, if the premium is less than the amount paid for the closing purchase transaction, as a realized loss on the Statement of Operations. If a call option is exercised, the premium is added to the proceeds from the sale of the underlying security in determining whether the Fund has realized a gain or loss. The Fund as writer of an option bears the market risk of an unfavorable change in the price of the security underlying the written option. The average market value of written options for the year ended October 31, 2018 was $(65,794). There were no open written options contracts at October 31, 2018. K. Futures Contracts The Fund may enter into futures transactions in order to attempt to hedge against changes in interest rates, securities prices and currency exchange rates or to seek to increase total return. Futures contracts are types of derivatives. All futures contracts entered into by the Fund are traded on a futures exchange. Upon entering into a futures contract, the Fund is required to deposit with a broker an amount of cash or securities equal to the minimum "initial margin" requirements of the associated futures exchange. The amount of cash deposited with the broker as collateral at October 31, 2018, is recorded as "Futures collateral" on the Statement of Assets and Liabilities. Subsequent payments for futures contracts ("variation margin") are paid or received by the Fund, depending on the daily fluctuation in the value of the contracts, and are recorded by the Fund as unrealized appreciation or depreciation. Cash received from or paid to the broker related to previous margin movement is held in a segregated account at the broker and is recorded as either "Due from broker for futures" or "Due to broker for futures" on the Statement of Assets and Liabilities. 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. With futures, there is reduced counterparty credit risk Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 53 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 market value of contracts open during the year ended October 31, 2018, was $(177,698,885). Open futures contracts outstanding at October 31, 2018 are listed in the Schedule of Investments. L. Total Return Swap Contracts The Fund may enter into total return swap contracts to attempt to manage and/or gain exposure to a security or market. Pursuant to total return swap contracts, the Fund negotiates with a counterparty to exchange a periodic stream of payments. One party makes payments based on the total return of a reference asset (such as a security or a basket of securities or securities index), and in return receives fixed or floating rate interest payments. The total return of the reference asset typically includes appreciation or depreciation on the reference asset, plus any interest or dividend payments. To the extent that the total return of the reference asset exceeds or falls short of the offsetting interest rate obligation, the Fund will receive a payment from or make a payment to the counterparty. Total return swap contracts are marked-to-market daily using valuations supplied by independent sources, and the change in value, if any, is recorded within "Swap contracts, at value" in the Statement of Assets and Liabilities. Payments received or made are recorded as realized gains or losses on the Statement of Operations. Total return swap contracts are subject to counterparty risk and unanticipated movements in value of exchange rates, interest rates, securities or the index. The average market value of total return swap contracts open during the year ended October 31, 2018 was $976,103. Open total return swap contracts at October 31, 2018 are listed in the Schedule of Investments. 2. Management Agreement The Adviser manages the Fund's portfolio. Effective October 1, 2018, management fees are calculated daily at an annual rate of 0.70% of the Fund's average daily net assets up to $1 billion, 0.675% of the next $1 billion and 0.65% on average daily net assets over $2 billion. Prior to October 1, 2018, management fees were calculated daily at an annual rate of 0.70% of the average daily net assets of the Fund, excluding assets invested in the Subsidiary and on which the Subsidiary pays a management fee. 54 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 The Subsidiary has entered into a separate management contract with the Adviser, pursuant to which the Adviser manages the assets of the Subsidiary. As compensation for its management services to the Subsidiary and expenses incurred with respect to the Subsidiary, the Subsidiary pays the Adviser a fee at the annual rate of 0.70% of the Subsidiary's average daily net assets. The Adviser has contractually agreed to limit ordinary operating expenses (ordinary operating expenses means all fund expenses other than taxes, brokerage commissions, acquired fund fees and expenses and extraordinary expenses, such as litigation) to the extent required to reduce Fund expenses to 1.20%, 0.90% and 0.90% of the average daily net assets attributable to Class A, Class K and Class Y shares, respectively. These expense limitations are in effect through March 1, 2019. Fees waived and expenses reimbursed during the year ended October 31, 2018 are reflected on the Statement of Operations. Fees and expenses of other investment companies in which the Fund may invest are not included in the expense limitations noted above. There can be no assurance that the Adviser 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 $62,902 in management fees, administrative costs and certain other reimbursements payable to the Adviser at October 31, 2018. 3. Transfer Agent DST Asset Manager Solutions, Inc. serves as the transfer agent to the Fund at negotiated rates. Transfer agent fees and payables shown on the Statement of Operations and the Statement of Assets and Liabilities, respectively, include sub-transfer agent expenses incurred through the Fund's omnibus relationship contracts. In addition, the Fund reimbursed the transfer agent for out-of-pocket expenses incurred by the transfer agent related to shareowner communications activities such as proxy and statement mailings, and outgoing phone calls. For the year ended October 31, 2018, such out-of-pocket expenses by class of shares were as follows: -------------------------------------------------------------------------------- Shareowner Communications -------------------------------------------------------------------------------- Class A $18,779 Class C 19,837 Class K 200 Class R 437 Class Y 16,145 -------------------------------------------------------------------------------- Total $55,398 ================================================================================ Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 55 4. Distribution and Service Plans The Fund has adopted a distribution plan (the "Plan") pursuant to Rule 12b-1 of the Investment Company Act of 1940 with respect to its Class A, Class C and Class R shares. Pursuant to the Plan, the Fund pays the Distributor 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 the Distributor 1.00% of the average daily net assets attributable to Class C shares. The fee for Class C shares consists of a 0.25% service fee and a 0.75% distribution fee paid as compensation for personal services and/or account maintenance services or distribution services with regard to Class C shares. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $21,444 in distribution fees payable to the Distributor at October 31, 2018. The Fund also has adopted a separate service plan for Class R shares (the "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 0.50% of the Fund's average daily net assets attributable to Class R shares held by such plans. In addition, redemptions of each class of shares (except Class K, Class R and Class Y shares) may be subject to a contingent deferred sales charge ("CDSC"). A CDSC of 1.00% may be imposed on redemptions of certain net asset value purchases of Class A shares within 12 months of purchase. Redemptions of Class C shares within 12 months of purchase are subject to a CDSC of 1.00%, based on the lower of cost or market value of shares being redeemed. Shares purchased as part of an exchange remain subject to any CDSC that applied to the original purchase of those shares. There is no CDSC for Class K, Class R or Class Y shares. Proceeds from the CDSCs are paid to the Distributor. For the year ended October 31, 2018, CDSCs in the amount of $8,194 were paid to the Distributor. 5. 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. Effective August 1, 2018, the Fund participates in a credit facility that is in the amount of $250 million. Prior to August 1, 2018, the credit facility that was in the amount of $195 million. Under such credit facility, depending on the type of loan, interest on borrowings is payable at the London Interbank Offered Rate ("LIBOR") plus 0.90% on an annualized basis, or the Alternate Base Rate, 56 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 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, or (c) 2% plus the overnight Eurodollar 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 year ended October 31, 2018, the Fund had no borrowings under the credit facility. 6. Master Netting Agreements The Fund has entered into an International Swaps and Derivatives Association, Inc. Master Agreement ("ISDA Master Agreement") or similar agreement with substantially all its derivative counterparties. An ISDA Master Agreement is a bilateral agreement between the Fund and a counterparty that governs the trading of certain Over the Counter ("OTC") derivatives and typically contains, among other things, close-out and set-off provisions which apply upon the occurrence of an event of default and/or a termination event as defined under the relevant ISDA Master Agreement. The ISDA Master Agreement may also give a party the right to terminate all transactions traded under such agreement if, among other things, there is deterioration in the credit quality of the other party. Upon an event of default or a termination of the ISDA Master Agreement, the non-defaulting party has the right to close out all transactions under such agreement and to net amounts owed under each transaction to determine one net amount payable by one party to the other. The right to close out and net payments across all transactions under the ISDA Master Agreement could result in a reduction of the Fund's credit risk to its counterparty equal to any amounts payable by the Fund under the applicable transactions, if any. However, the Fund's right to setoff may be restricted or prohibited by the bankruptcy or insolvency laws of the particular jurisdiction to which each specific ISDA of each counterparty is subject. The collateral requirements for derivatives transactions under an ISDA Master Agreement are governed by a credit support annex to the ISDA Master Agreement. Collateral requirements are generally determined at the close of business each day and are typically based on changes in market values for each transaction under an ISDA Master Agreement and netted into one amount for such agreement. Generally, the amount of collateral due from or to a counterparty is subject to threshold (a "minimum transfer amount") before a transfer is required, which may vary by counterparty. Collateral pledged for the benefit of the Fund and/or counterparty is held in segregated accounts by the Fund's custodian and cannot be sold, re-pledged, assigned or otherwise used while pledged. Cash that has been segregated to cover the Fund's Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 57 collateral obligations, if any, will be reported separately on the Statement of Assets and Liabilities as "Swaps collateral". Securities pledged by the Fund as collateral, if any, are identified as such on the Schedule of Investments. Financial instruments subject to an enforceable master netting agreement, such as an ISDA Master Agreement, have been offset on the Statement of Assets and Liabilities. The following charts show gross assets and liabilities of the Fund as of October 31, 2018. ------------------------------------------------------------------------------------------------------------------ Derivative Assets Derivatives Non-Cash Cash Net Amount Subject to Master Available for Collateral Collateral of Derivative Counterparty Netting Agreement Offset Received (a) Received (a) Assets (b) ------------------------------------------------------------------------------------------------------------------ Citibank N.A. $6,450,923 $ -- $ -- $ -- $6,450,923 Citigroup Global Markets, Inc. 130,535 -- -- -- 130,535 Goldman Sachs International -- -- -- -- -- JPMorgan Chase Bank N.A. 1,649,114 -- -- -- 1,649,114 ------------------------------------------------------------------------------------------------------------------ Total $8,230,572 $ -- $ -- $ -- $8,230,572 ================================================================================================================== ------------------------------------------------------------------------------------------------------------------ Derivative Liabilities Derivatives Non-Cash Cash Net Amount Subject to Master Available for Collateral Collateral of Derivative Counterparty Netting Agreement Offset Pledged (a) Pledged (a) Liabilities (c) ------------------------------------------------------------------------------------------------------------------ Citibank N.A. $ -- $ -- $ -- $ -- $ -- Citigroup Global Markets, Inc. -- -- -- -- -- Goldman Sachs International 1,132,760 -- -- (1,132,760) -- JPMorgan Chase Bank N.A. -- -- -- -- -- ------------------------------------------------------------------------------------------------------------------ Total $1,132,760 $ -- $ -- $(1,132,760) $ -- ================================================================================================================== (a) The amount presented here may be less than the total amount of collateral received/pledged, as the net amount of derivative assets and liabilities cannot be less than $0. (b) Represents the net amount due from the counterparty in the event of default. (c) Represents the net amount payable to the counterparty in the event of default. 7. Additional Disclosures about Derivative Instruments and Hedging Activities The Fund's use of derivatives may enhance or mitigate the Fund's exposure to the following risks: Interest rate risk relates to the fluctuations in the value of interest-bearing securities due to changes in the prevailing levels of market interest rates. Credit risk relates to the ability of the issuer of a financial instrument to make further principal or interest payments on an obligation or commitment that it has to the Fund. 58 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 Foreign exchange rate risk relates to fluctuations in the value of an asset or liability due to changes in currency exchange rates. Equity risk relates to the fluctuations in the value of financial instruments as a result of changes in market prices (other than those arising from interest rate risk or foreign exchange rate risk), whether caused by factors specific to an individual investment, its issuer, or all factors affecting all instruments traded in a market or market segment. Commodity risk relates to the risk that the value of a commodity or commodity index will fluctuate based on increases or decreases in the commodities market and factors specific to a particular industry or commodity. The fair value of open derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) by risk exposure at October 31, 2018 was as follows: -------------------------------------------------------------------------------------------- Statement of Assets and Liabilities Foreign Interest Credit Exchange Equity Commodity Rate Risk Risk Rate Risk Risk Risk -------------------------------------------------------------------------------------------- Assets Call options purchased* $ -- $ -- $ -- $ 8,230,572 $ -- Net unrealized appreciation on futures contracts $ -- $ -- $2,023,213 $ 9,617,820 $ -- -------------------------------------------------------------------------------------------- Total Value $ -- $ -- $2,023,213 $17,848,392 $ -- ============================================================================================ Liabilities Swap contracts, at value $ -- $ -- $ -- $ 1,132,760 $ -- -------------------------------------------------------------------------------------------- Total Value $ -- $ -- $ -- $ 1,132,760 $ -- ============================================================================================ * Reflects the market value of purchased option contracts (see Note 1I.). These amounts are included in investments in unaffiliated issuers, at value, on the statement of assets and liabilities. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 59 The effect of derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) on the Statement of Operations by risk exposure at October 31, 2018 was as follows: ----------------------------------------------------------------------------------------------------- Statement of Operations Foreign Interest Credit Exchange Equity Commodity Rate Risk Risk Rate Risk Risk Risk ----------------------------------------------------------------------------------------------------- Net realized gain (loss) on: Call options purchased** $ -- $ -- $ -- $ 16,955,273 $ -- Futures contracts (1,258,797) -- (1,127,755) (1,141,148) (1,989,534) Swap contracts -- -- -- 8,742,805 -- ----------------------------------------------------------------------------------------------------- Total Value $(1,258,797) $ -- $(1,127,755) $ 24,556,930 $(1,989,534) ===================================================================================================== Change in net unrealized appreciation (depreciation) on: Call options purchased** $ -- $ -- $ -- $(11,822,728) $ -- Put options purchased*** -- -- -- 764,533 -- Futures contracts 64,832 -- 614,831 13,964,787 -- Swap contracts -- -- -- (3,069,395) -- ----------------------------------------------------------------------------------------------------- Total Value $ 64,832 $ -- $ 614,831 $ (162,803) $ -- ===================================================================================================== ** Reflects the net realized gain (loss) on purchased option contracts (see Note 1I.). These amounts are included in net realized gain (loss) on investments in unaffiliated issuers, on the statements of operations. *** Reflects the change in net unrealized appreciation (depreciation) on purchased option contracts (see Note 1I.). These amounts are included in change in net unrealized appreciation (depreciation) on Investments in unaffiliated issuers, on the statements of operations. 60 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 Report of Independent Registered Public Accounting Firm To the Board of Trustees of Pioneer Series Trust VI and the Shareholders of Pioneer Flexible Opportunities Fund: -------------------------------------------------------------------------------- Opinion on the Financial Statements We have audited the accompanying consolidated statement of assets and liabilities, including the consolidated schedule of investments, of Pioneer Flexible Opportunities Fund (the "Fund") (one of the funds constituting Pioneer Series Trust VI (the "Trust")) as of October 31, 2018, and the related consolidated statements of operations, consolidated changes in net assets and the consolidated financial highlights for the year then ended and the related notes, and the consolidated statement of changes in net assets and financial highlights for the year ended October 31, 2017 (collectively referred to as the "financial statements"). The financial highlights for periods ended October 31, 2014, October 31, 2015 and October 31, 2016 were audited by another independent registered public accounting firm whose report, dated December 23, 2016, expressed an unqualified opinion on those financial highlights. In our opinion, the financial statements present fairly, in all material respects, the financial position of the Fund at October 31, 2018, the results of its operations, the changes in its net assets, and the financial highlights for the year ended, and the statement of changes in net assets and financial highlights for the year ended October 31, 2017, in conformity with U.S. generally accepted accounting principles. Basis for Opinion These financial statements are the responsibility of the Fund's management. Our responsibility is to express an opinion on the Fund's financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) ("PCAOB") and are required to be independent with respect to the Fund in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB. We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Fund is not required to have, nor were we engaged to perform, an audit of the Fund's internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting, but not for the purpose of expressing an opinion on the effectiveness of the Fund's internal control over financial reporting. Accordingly, we express no such opinion. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 61 Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our procedures included confirmation of securities owned as of October 31, 2018, by correspondence with the custodian and brokers. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion. /s/ Ernst & Young LLP We have served as the Fund's auditor since 2017. Boston, Massachusetts December 21, 2018 62 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 ADDITIONAL INFORMATION For the year ended October 31, 2018, certain dividends paid by the Fund may be subject to a maximum tax rate of 15%, as provided for by the Jobs and Growth Tax Relief Reconciliation Act (the Act) of 2003. The Fund intends to designate up to the maximum amount of such dividends allowable under the Act, as taxed at a maximum rate of 15%. Complete information will be computed and reported in conjunction with your 2018 form 1099-DIV. The qualifying percentage of the Fund's ordinary income dividends for the purpose of the corporate dividends received deduction was 35.89%. Change in Independent Registered Public Accounting Firm Prior to July 3, 2017 Pioneer Investment Management, Inc. (the "Adviser"), the Fund's investment adviser, was an indirect, wholly owned subsidiary of UniCredit S.p.A. ("UniCredit"). On that date, UniCredit completed the sale of its Pioneer Investments business, which includes the Adviser, to Amundi (the "Transaction"). As a result of the Transaction, the Adviser became an indirect, wholly owned subsidiary of Amundi. Amundi is controlled by Credit Agricole S.A. Amundi is headquartered in Paris, France, and, as of September 30, 2016, had more than $1.1 trillion in assets under management worldwide. Deloitte & Touche LLP ("D&T"), the Fund's previous independent registered public accounting firm, informed the Audit Committee and the Board that it would no longer be independent with respect to the Fund upon the completion of the Transaction as a result of certain services being provided to Amundi and Credit Agricole, and, accordingly, that it intended to resign as the Fund's independent registered public accounting firm upon the completion of the Transaction. D&T's resignation was effective on July 3, 2017, when the Transaction was completed. During the periods as to which D&T has served as the Fund's independent registered public accounting firm, D&T's reports on the Fund's financial statements have not contained an adverse opinion or disclaimer of opinion and have not been qualified or modified as to uncertainty, audit scope or accounting principles. Further, there have been no disagreements with D&T on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure, which, if not resolved to the satisfaction of D&T, would have caused D&T to make reference to the subject matter of the disagreement in connection with its report on the financial statements. In addition, there have been no reportable events of the kind described in Item 304(a)(1)(v) of Regulation S-K under the Securities Exchange Act of 1934. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 63 Effective immediately following the completion of the Transaction on July 3, 2017, the Board, acting upon the recommendation of the Audit Committee, engaged an independent registered public accounting firm, Ernst & Young LLP ("EY"). Prior to its engagement, EY had advised the Fund's Audit Committee that EY had identified the following matters, in each case relating to services rendered by other member firms of Ernst & Young Global Limited, all of which are located outside the United States, to UniCredit and certain of its subsidiaries during the period commencing July 1, 2016, that it determined to be inconsistent with the auditor independence rules set forth by the Securities and Exchange Commission ("SEC"): (a) project management support services to UniCredit in the Czech Republic, Germany, Italy, Serbia and Slovenia in relation to twenty-two projects, that were determined to be inconsistent with Rule 2-01(c)(4)(vi) of Regulation S-X (management functions); (b) two engagements for UniCredit in Italy where fees were contingent/success based and that were determined to be inconsistent with Rule 2-01(c)(5) of Regulation S-X (contingent fees); (c) four engagements where legal and expert services were provided to UniCredit in the Czech Republic and Germany, and twenty engagements where the legal advisory services were provided to UniCredit in Austria, Czech Republic, Italy and Poland, that were determined to be inconsistent with Rule 2-01(c)(4)(ix) and (x) of Regulation S-X (legal and expert services); and (d) two engagements for UniCredit in Italy involving assistance in the sale of certain assets, that were determined to be inconsistent with Rule 2-01(c)(4)(viii) of Regulation S-X (broker-dealer, investment adviser or investment banking services). None of the foregoing services involved the Fund, any of the other funds in the Pioneer Family of Funds or any other Pioneer entity sold by UniCredit in the Transaction. EY advised the Audit Committee that it had considered the matters described above and had concluded that such matters would not impair EY's ability to exercise objective and impartial judgment in connection with the audits of the financial statements of the Fund under the SEC and Public Company Accounting Oversight Board independence rules, and that a reasonable investor with knowledge of all relevant facts and circumstances would reach the same conclusion. Management and the Audit Committee considered these matters and discussed the matters with EY and, based upon EY's description of the matters and statements made by EY, Management and the Audit Committee believe that EY will be capable of exercising objective and impartial judgment in connection with the audits of the financial statements of the Fund, and Management further believes that a reasonable investor with knowledge of all relevant facts and circumstances would reach the same conclusion. 64 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 Approval of Investment Management Agreement Amundi Pioneer Asset Management, Inc. ("APAM") serves as the investment adviser to Pioneer Flexible Opportunities Fund (the "Fund") pursuant to an investment management agreement between APAM and the Fund. In order for APAM to remain the investment adviser of the Fund, the Trustees of the Fund must determine annually whether to renew the investment management agreement for the Fund. The contract review process began in January 2018 as the Trustees of the Fund agreed on, among other things, an overall approach and timeline for the process. Contract review materials were provided to the Trustees in March 2018, July 2018 and September 2018. In addition, the Trustees reviewed and discussed the Fund's performance at regularly scheduled meetings throughout the year, and took into account other information related to the Fund provided to the Trustees at regularly scheduled meetings, in connection with the review of the Fund's investment management agreement. In March 2018, the Trustees, among other things, discussed the memorandum provided by Fund counsel that summarized the legal standards and other considerations that are relevant to the Trustees in their deliberations regarding the renewal of the investment management agreement, and reviewed and discussed the qualifications of the investment management teams for the Fund, as well as the level of investment by the Fund's portfolio managers in the Fund. In July 2018, the Trustees, among other things, reviewed the Fund's management fees and total expense ratios, the financial statements of APAM and its parent companies, profitability analyses provided by APAM, and analyses from APAM as to possible economies of scale. The Trustees also reviewed the profitability of the institutional business of APAM and APAM's affiliate, Amundi Pioneer Institutional Asset Management, Inc. ("APIAM" and, together with APAM, "Amundi Pioneer"), as compared to that of APAM's fund management business, and considered the differences between the fees and expenses of the Fund and the fees and expenses of APAM's and APIAM's institutional accounts, as well as the different services provided by APAM to the Fund and by APAM and APIAM to the institutional accounts. The Trustees further considered contract review materials, including additional materials received in response to the Trustees' request, in September 2018. At a meeting held on September 18, 2018, based on their evaluation of the information provided by APAM and third parties, the Trustees of the Fund, including the Independent Trustees voting separately, unanimously approved the renewal of the investment management agreement for another year. In Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 65 approving the renewal of the investment management agreement, the Trustees considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the renewal of the agreement. APAM also serves as the investment adviser to Flexible Opportunities Commodity Fund Ltd. (the "Subsidiary"), a wholly-owned subsidiary of the Fund organized under the laws of the Cayman Islands. The Trustees also approved the renewal of the investment management agreement for the Subsidiary (the "Subsidiary Management Agreement") at the September 18, 2018 meeting. The factors considered by the Trustees in approving the renewal of the Subsidiary Management Agreement were substantially the same as the factors described below with respect to the investment management agreement for the Fund. Nature, Extent and Quality of Services The Trustees considered the nature, extent and quality of the services that had been provided by APAM to the Fund, taking into account the investment objective and strategy of the Fund. The Trustees also reviewed APAM's investment approach for the Fund and its research process. The Trustees considered the resources of APAM and the personnel of APAM who provide investment management services to the Fund. They also reviewed the amount of non-Fund assets managed by the portfolio managers of the Fund. They considered the non-investment resources and personnel of APAM that are involved in APAM's services to the Fund, including APAM's compliance, risk management, and legal resources and personnel. The Trustees noted the substantial attention and high priority given by APAM's senior management to the Pioneer Fund complex. The Trustees considered that APAM supervises and monitors the performance of the Fund's service providers and provides the Fund with personnel (including Fund officers) and other resources that are necessary for the Fund's business management and operations. The Trustees also considered that, as administrator, APAM is responsible for the administration of the Fund's business and other affairs. The Trustees considered the fees paid to APAM for the provision of administration services. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that had been provided by APAM to the Fund were satisfactory and consistent with the terms of the investment management agreement. 66 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 Performance of the Fund In considering the Fund's performance, the Trustees regularly review and discuss throughout the year data prepared by APAM and information comparing the Fund's performance with the performance of its peer group of funds, as classified by Morningstar, Inc. (Morningstar), and the performance of the Fund's benchmark index. They also discuss the Fund's performance with APAM on a regular basis. The Trustees' regular reviews and discussions were factored into the Trustees' deliberations concerning the renewal of the investment management agreement. Management Fee and Expenses The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees of its peer group of funds as classified by Morningstar and also to the expense ratios of a peer group of funds selected on the basis of criteria determined by the Independent Trustees for this purpose using data provided by Strategic Insight Mutual Fund Research and Consulting, LLC (Strategic Insight), an independent third party. The peer group comparisons referred to below are organized in quintiles. Each quintile represents one-fifth of the peer group. In all peer group comparisons referred to below, first quintile is most favorable to the Fund's shareowners. The Trustees noted that they separately review and consider the impact of the Fund's transfer agency and Fund- and APAM-paid expenses for sub-transfer agency and intermediary arrangements, and that the results of the most recent such review were considered in the consideration of the Fund's expense ratio. The Trustees considered that the Fund's management fee for the most recent fiscal year was in the second quintile relative to the management fees paid by other funds in its Morningstar category for the comparable period. The Trustees noted that although assets invested by the Fund in the Subsidiary are excluded from the calculation of the Fund's management fee, the Fund indirectly pays a management fee with respect to assets invested in the Subsidiary because the Subsidiary pays a management fee pursuant to the Subsidiary Management Agreement. The Trustees noted that the Subsidiary pays APAM a management fee at the same rate that the Fund pays APAM. The Trustees considered that the expense ratio of the Fund's Class A shares for the most recent fiscal year was in the second quintile relative to its Strategic Insight peer group for the comparable period. The Trustees considered that the expense ratio of the Fund's Class Y shares for the most recent fiscal year was in the second quintile relative to its Strategic Insight peer group for the comparable period. The Trustees noted that APAM had agreed to waive fees and/or reimburse expenses in order to limit the ordinary operating expenses of the Fund. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 67 The Trustees reviewed management fees charged by APAM and APIAM to institutional and other clients, including publicly offered European funds sponsored by APAM's affiliates, unaffiliated U.S. registered investment companies (in a sub-advisory capacity), and unaffiliated foreign and domestic separate accounts. The Trustees also considered APAM's costs in providing services to the Fund and APAM's and APIAM's costs in providing services to the other clients and considered the differences in management fees and profit margins for fund and non-fund services. In evaluating the fees associated with APAM's and APIAM's client accounts, the Trustees took into account the respective demands, resources and complexity associated with the Fund and other client accounts. The Trustees noted that, in some instances, the fee rates for those clients were lower than the management fee for the Fund and considered that, under the investment management agreement with the Fund, APAM performs additional services for the Fund that it does not provide to those other clients or services that are broader in scope, including oversight of the Fund's other service providers and activities related to compliance and the extensive regulatory and tax regimes to which the Fund is subject. The Trustees also considered the entrepreneurial risks associated with APAM's management of the Fund. The Trustees concluded that the management fee payable by the Fund to APAM was reasonable in relation to the nature and quality of the services provided by APAM. Profitability The Trustees considered information provided by APAM regarding the profitability of APAM with respect to the advisory services provided by APAM to the Fund, including the methodology used by APAM in allocating certain of its costs to the management of the Fund. The Trustees also considered APAM's profit margin in connection with the overall operation of the Fund. They further reviewed the financial results, including the profit margins, realized by APAM and APIAM from non-fund businesses. The Trustees considered APAM's profit margins in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees concluded that APAM's profitability with respect to the management of the Fund was not unreasonable. Economies of Scale The Trustees considered APAM's views relating to economies of scale in connection with the Pioneer Funds as fund assets grow and the extent to which any such economies of scale are shared with the Fund and Fund shareholders. The Trustees recognize that economies of scale are difficult to identify and quantify, and that, among other factors that may be relevant, are the following: fee levels, expense subsidization, investment by APAM in 68 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 research and analytical capabilities and APAM's commitment and resource allocation to the Fund. The Trustees noted that profitability also may be an indicator of the availability of any economies of scale, although profitability may vary for other reasons including due to reductions in expenses. The Trustees concluded that economies of scale, if any, were being appropriately shared with the Fund. Other Benefits The Trustees considered the other benefits that APAM enjoys from its relationship with the Fund. The Trustees considered the character and amount of fees paid or to be paid by the Fund, other than under the investment management agreement, for services provided by APAM and its affiliates. The Trustees further considered the revenues and profitability of APAM's businesses other than the Fund business. To the extent applicable, the Trustees also considered the benefits to the Fund and to APAM and its affiliates from the use of "soft" commission dollars generated by the Fund to pay for research and brokerage services. The Trustees considered that Amundi Pioneer is the principal U.S. asset management business of Amundi, which is one of the largest asset managers globally. Amundi's worldwide asset management business manages over $1.7 trillion in assets (including the Pioneer Funds). The Trustees considered that APAM's relationship with Amundi creates potential opportunities for APAM, APIAM and Amundi that derive from APAM's relationships with the Fund, including Amundi's ability to market the services of APAM globally. The Trustees noted that APAM has access to additional research and portfolio management capabilities as a result of its relationship with Amundi and Amundi's enhanced global presence that may contribute to an increase in the resources available to APAM. The Trustees considered that APAM and the Fund receive reciprocal intangible benefits from the relationship, including mutual brand recognition and, for the Fund, direct and indirect access to the resources of a large global asset manager. The Trustees concluded that any such benefits received by APAM as a result of its relationship with the Fund were reasonable. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including the Independent Trustees, concluded that the investment management agreement for the Fund, including the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of the investment management agreement. The Trustees, including the Independent Trustees, also concluded that the Subsidiary Management Agreement, including the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of the Subsidiary Management Agreement. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 69 Trustees, Officers and Service Providers Investment Adviser Amundi Pioneer Asset Management, Inc. Custodian and Sub-Administrator Brown Brothers Harriman & Co. Independent Registered Public Accounting Firm Ernst & Young LLP Principal Underwriter Amundi Pioneer Distributor, Inc. Legal Counsel Morgan, Lewis & Bockius LLP Shareowner Services and Transfer Agent DST Asset Manager Solutions, 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 www.amundipioneer.com. This information is also available on the Securities and Exchange Commission's web site at www.sec.gov. Trustees and Officers The Fund's Trustees and officers are listed below, together with their principal occupations and other directorships they have held during at least the past five years. Trustees who are interested persons of the Fund within the meaning of the 1940 Act are referred to as Interested Trustees. Trustees who are not interested persons of the Fund are referred to as Independent Trustees. Each of the Trustees serves as a Trustee of each of the 43 U.S. registered investment portfolios for which Amundi Pioneer serves as investment adviser (the "Pioneer Funds"). The address for all Trustees and all officers of the Fund is 60 State Street, Boston, Massachusetts 02109. The Statement of Additional Information of the Fund includes additional information about the Trustees and is available, without charge, upon request, by calling 1-800-225-6292. 70 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 Independent Trustees ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Position Term of Office and Other Directorships Held With the Fund Length of Service Principal Occupation Held by Trustee ------------------------------------------------------------------------------------------------------------------------------------ Thomas J. Perna (68) Trustee since 2010. Private investor (2004 - 2008 and 2013 - Director, Broadridge Financial Chairman of the Serves until a present); Chairman (2008 - 2013) and Chief Solutions, Inc. (investor Board and Trustee successor trustee is Executive Officer (2008 - 2012), Quadriserv, communications and securities elected or earlier Inc. (technology products for securities lending processing provider for retirement or industry); and Senior Executive Vice President, financial services industry) removal. The Bank of New York (financial and securities (2009 - present); Director, services) (1986 - 2004) Quadriserv, Inc. (2005 - 2013); and Commissioner, New Jersey State Civil Service Commission (2011 - 2015) ------------------------------------------------------------------------------------------------------------------------------------ David R. Bock (74) Trustee since 2010. Managing Partner, Federal City Capital Advisors Director of New York Mortgage Trustee Serves until a (corporate advisory services company) (1997 - Trust(publicly-traded mortgage successor trustee is 2004 and 2008 - present); Interim Chief REIT) (2004 - 2009, 2012 - elected or earlier Executive Officer, Oxford Analytica, Inc. present); Director of The Swiss retirement or (privately held research and consulting company) Helvetia Fund, Inc. (closed- removal. (2010); Executive Vice President and Chief end fund) (2010 - 2017); Financial Officer, I-trax, Inc. (publicly traded Director of Oxford Analytica, health care services company) (2004 - 2007); and Inc. (2008 - 2015); and Executive Vice President and Chief Financial Director of Enterprise Officer, Pedestal Inc. (internet-based mortgage Community Investment, Inc. trading company) (2000 - 2002); Private (privately-held affordable Consultant (1995 - 1997); Managing Director, housing finance company) (1985 Lehman Brothers (1992 - 1995); and Executive, - 2010) The World Bank (1979 - 1992) ------------------------------------------------------------------------------------------------------------------------------------ Benjamin M. Friedman (74) Trustee since 2010. William Joseph Maier Professor of Political Trustee, Mellon Institutional Trustee Serves until a Economy, Harvard University (1972 - present) Funds Investment Trust and successor trustee is Mellon Institutional Funds elected or earlier Master Portfolio (oversaw 17 retirement or portfolios in fund complex) removal. (1989 - 2008) ------------------------------------------------------------------------------------------------------------------------------------ Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 71 Independent Trustees (continued) ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Position Term of Office and Other Directorships Held With the Fund Length of Service Principal Occupation Held by Trustee ------------------------------------------------------------------------------------------------------------------------------------ Margaret B.W. Graham (71) Trustee since 2010. Founding Director, Vice-President and Corporate None Trustee Serves until a Secretary, The Winthrop Group, Inc. (consulting successor trustee is firm) (1982 - present); Desautels Faculty of elected or earlier Management, McGill University (1999 - 2017); and retirement or Manager of Research Operations and removal. Organizational Learning, Xerox PARC, Xerox's advance research center (1990-1994) ------------------------------------------------------------------------------------------------------------------------------------ Lorraine H. Monchak (62) Trustee since 2017. Chief Investment Officer, 1199 SEIU Funds None Trustee (Advisory Trustee (healthcare workers union pension funds) (2001 - from 2014 - 2017) present); Vice President - International Serves until a Investments Group, American International Group, successor trustee is Inc. (insurance company) (1993 - 2001); Vice elected or earlier President - Corporate Finance and Treasury retirement or Group, Citibank, N.A. (1980 - 1986 and 1990 - removal. 1993); Vice President - Asset/Liability Management Group, Federal Farm Funding Corporation (government-sponsored issuer of debt securities) (1988 - 1990); Mortgage Strategies Group, Shearson Lehman Hutton, Inc. (investment bank) (1987 - 1988); and Mortgage Strategies Group, Drexel Burnham Lambert, Ltd. (investment bank) (1986 - 1987) ------------------------------------------------------------------------------------------------------------------------------------ Marguerite A. Piret (70) Trustee since 2010. President and Chief Executive Officer, Newbury Director of New America High Trustee Serves until a Piret Company (investment banking firm) (1981 - Income Fund, Inc. (closed-end successor trustee is present) investment company) (2004 - elected or earlier present); and Member, Board of retirement or Governors, Investment Company removal. Institute (2000 - 2006) ------------------------------------------------------------------------------------------------------------------------------------ Fred J. Ricciardi (71) Trustee since 2014. Consultant (investment company services) (2012 - None Trustee Serves until a present); Executive Vice President, BNY Mellon successor trustee is (financial and investment company services) elected or earlier (1969 - 2012); Director, BNY International retirement or Financing Corp. (financial services) (2002 - removal. 2012); and Director, Mellon Overseas Investment Corp. (financial services) (2009 - 2012) ------------------------------------------------------------------------------------------------------------------------------------ 72 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 Interested Trustees ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Position Term of Office and Other Directorships Held With the Fund Length of Service Principal Occupation Held by Trustee ------------------------------------------------------------------------------------------------------------------------------------ Lisa M. Jones (56)* Trustee since 2017. Director, CEO and President of Amundi Pioneer None Trustee, President and Serves until a Asset Management USA, Inc. (since September Chief Executive Officer successor trustee is 2014); Director, CEO and President of Amundi elected or earlier Pioneer Asset Management, Inc. (since September retirement or 2014); Director, CEO and President of Amundi removal Pioneer Distributor, Inc. (since September 2014); Director, CEO and President of Amundi Pioneer Institutional Asset Management, Inc. (since September 2014); Chair, Amundi Pioneer Asset Management USA, Inc., Amundi Pioneer Distributor, Inc. and Amundi Pioneer Institutional Asset Management, Inc. (September 2014 - 2018); Managing Director, Morgan Stanley Investment Management (2010 - 2013); and Director of Institutional Business, CEO of International, Eaton Vance Management (2005 - 2010) ------------------------------------------------------------------------------------------------------------------------------------ Kenneth J. Taubes (60)* Trustee since 2014. Director and Executive Vice President (since None Trustee Serves until a 2008) and Chief Investment Officer, U.S. (since successor trustee is 2010) of Amundi Pioneer Asset Management USA, elected or earlier Inc.; Executive Vice President and Chief retirement or Investment Officer, U.S. of Amundi Pioneer removal (since 2008); Executive Vice President of Amundi Pioneer Institutional Asset Management, Inc. (since 2009); and Portfolio Manager of Amundi Pioneer (since 1999) ------------------------------------------------------------------------------------------------------------------------------------ * Ms. Jones and Mr. Taubes are Interested Trustees because they are officers or directors of the Fund's investment adviser and certain of its affiliates. Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 73 Fund Officers ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Position Term of Office and Other Directorships Held With the Fund Length of Service Principal Occupation Held by Officer ------------------------------------------------------------------------------------------------------------------------------------ Christopher J. Kelley (53) Since 2010. Serves Vice President and Associate General Counsel of None Secretary and at the discretion of Amundi Pioneer since January 2008; Secretary and Chief Legal Officer the Board Chief Legal Officer of all of the Pioneer Funds since June 2010; Assistant Secretary of all of the Pioneer Funds from September 2003 to May 2010; and Vice President and Senior Counsel of Amundi Pioneer from July 2002 to December 2007 ------------------------------------------------------------------------------------------------------------------------------------ Carol B. Hannigan (57) Since 2010. Serves Fund Governance Director of Amundi Pioneer since None Assistant Secretary at the discretion of December 2006 and Assistant Secretary of all the the Board Pioneer Funds since June 2010; Manager - Fund Governance of Amundi Pioneer from December 2003 to November 2006; and Senior Paralegal of Amundi Pioneer from January 2000 to November 2003 ------------------------------------------------------------------------------------------------------------------------------------ Thomas Reyes (55) Since 2010. Serves Senior Counsel of Amundi Pioneer since May 2013 None Assistant Secretary at the discretion of and Assistant Secretary of all the Pioneer Funds the Board since June 2010; and Counsel of Amundi Pioneer from June 2007 to May 2013 ------------------------------------------------------------------------------------------------------------------------------------ Mark E. Bradley (58) Since 2010. Serves Vice President - Fund Treasury of Amundi None Treasurer and at the discretion of Pioneer; Treasurer of all of the Pioneer Funds Chief Financial and the Board since March 2008; Deputy Treasurer of Amundi Accounting Officer Pioneer from March 2004 to February 2008; and Assistant Treasurer of all of the Pioneer Funds from March 2004 to February 2008 ------------------------------------------------------------------------------------------------------------------------------------ Luis I. Presutti (53) Since 2010. Serves Director - Fund Treasury of Amundi Pioneer; and None Assistant Treasurer at the discretion of Assistant Treasurer of all of the Pioneer Funds the Board ------------------------------------------------------------------------------------------------------------------------------------ Gary Sullivan (60) Since 2010. Serves Senior Manager - Fund Treasury of Amundi None Assistant Treasurer at the discretion of Pioneer; and Assistant Treasurer of all of the the Board Pioneer Funds ------------------------------------------------------------------------------------------------------------------------------------ 74 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 Fund Officers (continued) ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Position Term of Office and Other Directorships Held With the Fund Length of Service Principal Occupation Held by Officer ------------------------------------------------------------------------------------------------------------------------------------ David F. Johnson (38) Since 2010. Serves Senior Manager - Fund Treasury of Amundi Pioneer None Assistant Treasurer at the discretion of since November 2008; Assistant Treasurer of all the Board of the Pioneer Funds since January 2009; and Client Service Manager - Institutional Investor Services at State Street Bank from March 2003 to March 2007 ------------------------------------------------------------------------------------------------------------------------------------ John Malone (47) Since 2018. Serves Managing Director, Chief Compliance Officer of None Chief Compliance Officer at the discretion of Amundi Pioneer Asset Management; Amundi Pioneer the Board Institutional Asset Management, Inc.; and the Pioneer Funds since September 2018; and Chief Compliance Officer of Amundi Pioneer Distributor, Inc. since January 2014. ------------------------------------------------------------------------------------------------------------------------------------ Kelly O'Donnell (47) Since 2010. Serves Vice President - Investor Services Group of None Anti-Money Laundering at the discretion of Amundi Pioneer and Anti-Money Laundering Officer Officer the Board of all the Pioneer Funds since 2006 ------------------------------------------------------------------------------------------------------------------------------------ Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 75 This page is for your notes. 76 Pioneer Flexible Opportunities Fund | Annual Report | 10/31/18 How to Contact Amundi 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 FactFoneSM for automated fund yields, prices, account information and transactions 1-800-225-4321 Retirement plans information 1-800-622-0176 Write to us: -------------------------------------------------------------------------------- Amundi Pioneer P.O. Box 55014 Boston, Massachusetts 02205-5014 Our toll-free fax 1-800-225-4240 Our internet e-mail address us.askamundipioneer@amundipioneer.com (for general questions about Amundi Pioneer only) Visit our web site: www.amundipioneer.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. [LOGO] Amundi Pioneer ============== ASSET MANAGEMENT Amundi Pioneer Asset Management, Inc. 60 State Street Boston, MA 02109 www.amundipioneer.com Securities offered through Amundi Pioneer Distributor, Inc. 60 State Street, Boston, MA 02109 Underwriter of Pioneer Mutual Funds, Member SIPC [C] 2018 Amundi Pioneer Asset Management 24440-08-1218 Pioneer Floating Rate Fund -------------------------------------------------------------------------------- Annual Report | October 31, 2018 -------------------------------------------------------------------------------- Ticker Symbols: Class A FLARX Class C FLRCX Class Y FLYRX [LOGO] Amundi Pioneer ============== ASSET MANAGEMENT visit us: www.amundipioneer.com Table of Contents President's Letter 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 54 Notes to Financial Statements 61 Report of Independent Registered Public Accounting Firm 78 Additional Information 80 Approval of Investment Management Agreement 82 Trustees, Officers and Service Providers 87 Pioneer Floating Rate Fund | Annual Report | 10/31/18 1 President's Letter Despite economic news that has remained generally positive throughout 2018, market volatility has increased significantly this year compared with 2017. October was a particularly poor month for both U.S. and global equity markets, as every major stock market index finished the month in negative territory. Results have been more mixed on the fixed-income side, with rising interest rates pushing down most year-to-date returns. On the economic front, U.S. gross domestic product (GDP) growth exceeded 4% in the second quarter of 2018 and topped 3% once again in the third quarter. The low unemployment rate has continued, with initial jobless claims recently hitting a multi-decade low and consumer and small-business confidence also achieving levels not seen in many years. Despite the good economic news, and even though wages have been rising, inflation expectations have not risen significantly. For its part, the U.S. Federal Reserve System (the Fed) has continued with its tightening of monetary policy by raising interest rates three times in 2018, while moving forward with the tapering of its balance sheet, a process which began in October 2017. The greater market volatility this year as compared to last year has been driven by several factors. The aforementioned rising interest rates have been one reason, while the uncertainty surrounding U.S. trade policy has, at times, also led to unsettled markets. Of course, in today's global economy, risk factors extend well beyond U.S. borders, and in recent months investors have grappled with various issues on the international front, including questions surrounding the United Kingdom's Brexit negotiations, concerns about the budgetary policies of the populist Italian government, and the potential impact of Turkey's economic challenges on European banks. Moreover, while trade tensions between the U.S. and Europe have moderated, questions about the future of the U.S./China trade relationship remain unresolved, and any major fracture in that relationship could have a negative impact on China's economy and, by extension, on its Asian trade partners. With regard to our market outlook, over the medium term, we believe the fundamental investment case for U.S. equities remains in place, with support from the fairly positive economic backdrop and with an additional lift potentially coming from the investment side as U.S. businesses consider increasing capital expenditures. We do believe market volatility will persist and, therefore, careful selection of investment themes, sector allocations, and individual stocks will be increasingly relevant to overall performance, as the 2 Pioneer Floating Rate Fund | Annual Report | 10/31/18 maturity of the economic and market cycles could eventually become headwinds. We believe a focus on owning shares of quality companies trading at reasonable prices is key to navigating the current equity-market phase. In fixed income, we have taken a more cautious approach across our core portfolios with regard to credit-sensitive debt such as corporate bonds, favoring quality and liquidity. As interest rates have risen, we find that short- and intermediate-term U.S. Treasuries have become more attractive, and that agency mortgage-backed securities (MBS) and high-quality, non-agency MBS now also offer lower downside risk. In general, we think structured sectors (such as asset-backed securities and MBS) are more attractive than corporate sectors. We believe this year's market fluctuations as well as increased risk factors within the global economy have served to remind investors of the importance of active management. Since 1928, active management has been the foundation of Amundi Pioneer's investment approach. We believe active management is especially important during periods of volatility, and that our shareowners can benefit from the experience and tenure of our investment teams, who work collaboratively to make active and informed decisions across our funds. As always, and particularly during times of market uncertainty, we encourage you to work with your financial advisor to develop an overall investment plan that addresses both your short- and long-term goals, and to implement such a plan in a disciplined manner. We greatly appreciate the trust you have placed in us and look forward to continuing to serve you in the future. Sincerely, /s/ Lisa M. Jones Lisa M. Jones Head of the Americas, President and CEO of U.S. Amundi Pioneer Asset Management USA, Inc. October 31, 2018 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. Past performance is no guarantee of future results. Pioneer Floating Rate Fund | Annual Report | 10/31/18 3 Portfolio Management Discussion | 10/31/18 In the following interview, Jonathan Sharkey discusses the factors that influenced the bank-loan market and the performance of Pioneer Floating Rate Fund during the 12-month period ended October 31, 2018. Mr. Sharkey, a senior vice president and a portfolio manager at Amundi Pioneer Asset Management, Inc., is responsible for the day-to-day management of the Fund. Q How did the Fund perform during the 12-month period ended October 31, 2018? A Pioneer Floating Rate Fund's Class A shares returned 2.96% at net asset value during the 12-month period ended October 31, 2018, while the Fund's benchmark, the Standard & Poor's/Loan Syndications & Trading Association Leveraged Performing Loan Index (the S&P/LSTA Index), returned 4.78%. During the same period, the average return of the 239 mutual funds in Morningstar's Bank Loan Funds category was 3.51%. Q How would you describe the environment for investing in bank loans during the 12-month period ended October 31, 2018? A Entering the 12-month period, credit-sensitive areas of the bond market - that is, securities more susceptible to default risk rather than interest-rate risk - including bank loans, continued to receive support from positive economic data. Credit-market sentiment received an additional boost as 2017 drew to a close with the passage of a U.S. tax package that included a lowering of the corporate tax rate, a one-time opportunity for companies to repatriate cash held overseas on favorable terms, and a window during which companies can accelerate the expensing of capital investments. While U.S. gross domestic product (GDP) growth for the first quarter of 2018 was tabulated at a relatively modest 2.2%, many analysts attributed that to seasonal factors. The view was confirmed as GDP growth for the second and third quarters came in at 4.2% and 3.5%, respectively. Second-quarter corporate earnings results saw already robust profits surprise to the upside for most companies, while unemployment dipped below 4% as the 12-month period drew to a close. In addition to a strong fundamental backdrop for the credit markets, the attractiveness of loans as an asset class benefited from a rising-interest-rate environment over the 12 months. Four times during the period, the Federal 4 Pioneer Floating Rate Fund | Annual Report | 10/31/18 Reserve (the Fed) increased the target range for its overnight lending rate by 0.25%, driving the federal funds rate up to 2.25% as of period-end. The Fed's moves, in turn, put upward pressure on the LIBOR reference rates used to set the baselines for the yields on most bank loans (LIBOR refers to London Interbank Offered Rate). The impact of the Fed's rate hikes on loan yields was somewhat muted, however, as many borrowers have recently elected to tie payments to one-month LIBOR in lieu of the traditional three-month LIBOR. Increases in the one-month LIBOR rate have been temporarily suppressed, at least somewhat, in recent months by reduced demand for shorter-term investments in light of the prospect of U.S. companies repatriating cash post-tax reform. The upward movement in loan yields was also constrained by spread-tightening and a favorable refinancing environment, as investor sentiment towards bank loans has been supported by a low default rate. (Loan spreads are the interest rates over and above the LIBOR rate charged to borrowers by banks.) Supply-and-demand factors were generally favorable for bank loans over the 12 months. For much of the period, new issuance was below levels seen one year ago. Loan performance also benefited from strong institutional demand for yield, as reflected in robust formation of collateralized loan obligations (CMOs). In addition, retail loan mutual fund flows moved from negative in late 2017 to consistently positive as 2018 progressed, which was another positive factor for bank loans. Q What factors had the biggest effects on the Fund's benchmark-relative performance during the 12-month period ended October 31, 2018? A The Fund's absolute performance during the period was positive, though it did lag the return of the benchmark S&P/LSTA Index. The Fund's benchmark-relative underperformance was due in part to our maintaining a somewhat elevated cash position in the portfolio early in the period, which slightly constrained performance in a rising market. Given the strong refinancing environment, we elected to take a cautious stance toward investing new money into secondary market loans trading at a premium. In addition, much of the new-issue loan calendar featured loans that were either lower-quality or more highly-leveraged than the loans we preferred to hold in the portfolio. More broadly, we have sought to maintain a higher-quality profile in the Fund's portfolio than that of the benchmark, which also weighed on relative returns during a period in which riskier credits rated in the CCC or lower-B range generally outperformed higher-rated loans. Pioneer Floating Rate Fund | Annual Report | 10/31/18 5 The Fund's allocation across industries was essentially a neutral factor in its benchmark-relative performance during the period, while security selection results were a modest detractor from relative returns. During the 12-month period, none of the issues held by the Fund were subject to default. In terms of individual loan names that contributed to or detracted from the Fund's benchmark-relative returns, the portfolio's exposures to luxury department store chain Neiman Marcus and business supply chain Staples aided relative performance, as the deterioration in conditions for brick-and-mortar retailers eased over the period. In addition, exposure to the loans of grocery chain Albertsons proved beneficial for the Fund's performance, as investor sentiment improved after a proposed merger between Albertsons and drugstore chain Rite Aid was cancelled. A meaningful portfolio overweight in loans to CenturyLink also helped benchmark-relative returns, as the telecommunications company posted positive operating results. On the downside, the loan valuation for Catalina Marketing, a provider of targeted marketing services to grocery stores and other retailers, declined during the period as the company experienced client losses and weaker operating results. The Fund's exposure to Catalina's loans detracted from benchmark-relative returns. Another detractor from benchmark-relative performance was Revlon, as the loan prices declined on poor results and questions about the level of protection creditors would be afforded should the beauty company be taken private. Another Fund holding, point-of-sale technology solutions provider and ATM (automated teller) manufacturer Deibold Nixdorf, saw its loan price decline during the period on a softening in demand. Finally, the Fund's out-of-benchmark exposure to the high-yield bonds of Community Health Systems weighed on benchmark-relative returns, as results for the acute-care hospital operator continued to slide. One other positive contributor to the Fund's benchmark-relative performance during the period was an out-of-benchmark position in "catastrophe" bonds, which are insurance-linked securities (ILS) issued by insurers to mitigate the effects of claims payouts in the wake of a natural disaster. The Fund's ILS exposure more than offset the negative effects on 6 Pioneer Floating Rate Fund | Annual Report | 10/31/18 performance of the portfolio's out-of-benchmark position in high-yield corporates, as high yield lagged the returns of bank loans over the 12-month period. Q Did the Fund have any investments in derivative securities during the 12-month period ended October 31, 2018? If so, did the derivatives have any material effect on results? A Yes. We invested the Fund in high-yield bond and investment-grade bond credit-default swaps during the period, principally to maintain liquidity in the portfolio. The derivatives had no material impact on the Fund's performance. Q Did the Fund's distributions to shareholders change during the 12-month period ended October 31, 2018? A The Fund's distributions* increased during the period, in part due to the Fed's interest-rate hikes, which resulted in higher LIBOR reference rates for bank loans. In addition, we took advantage of improved loan valuations late in the period and reduced the proportion of cash held in the portfolio, thus providing more income for shareholder distributions. Q What is your investment outlook? A The default rate on loans for the 12-month period ended October 31, 2018, stood at 1.92% by loan volume, which was below the historical average of slightly more than 3%. The default rate by number of issuers was 1.79%, also below the long-term average. We view loan fundamentals as positive and expect default rates to remain manageable. We continue to maintain an up-in-quality bias in the portfolio as compared with the S&P/LSTA Index. The loan market has recently seen an uptick in the amount of leverage utilized in buyout activity, and so we have refrained from having the Fund participate in a number of the more-levered deals. We are emphasizing owning the loans of borrowers with strong cash flows, which could help ensure that those borrowers can pay their obligations in the event interest rates rise meaningfully from here, or if conditions deteriorate. We have focused our recent loan purchases within the broadcast, oil & gas, and financial intermediary loan-market segments. * Distributions are not guaranteed. Pioneer Floating Rate Fund | Annual Report | 10/31/18 7 We are maintaining only modest out-of-benchmark exposure in the portfolio to high-yield corporates, as we view the interest-rate environment as more favorable for bank loans. We are also maintaining a modest Fund position in ILS, based on the diversification** effect they can provide. We believe bank loans have demonstrated their investment value in the current rising-rate environment, as they substantially outperformed both high-yield and investment-grade corporate bonds over the 12-month period. With the current U.S. economic recovery in its 10th year, we regard a portfolio emphasis on the higher-quality tier of the loan market as appropriate, even if the positioning has acted as a constraint on the Fund's recent benchmark-relative performance. ** Diversification does not assure a profit nor protect against loss. 8 Pioneer Floating Rate Fund | Annual Report | 10/31/18 Please refer to the Schedule of Investments on pages 17-53 for a full listing of Fund securities. All investments are subject to risk, including the possible loss of principal. In the past several years, financial markets have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. These conditions may continue, recur, worsen or spread. Debt securities rated below investment grade are commonly referred to as "junk bonds" and are considered speculative. Below-investment-grade debt securities involve greater risk of loss, are subject to greater price volatility and are less liquid, especially during periods of economic uncertainty or change, than higher-rated debt securities. The Fund may invest in high-yield securities of any rating, including securities that are in default at the time of purchase. Securities with floating interest rates generally are less sensitive to interest rate changes but may decline in value if their interest rates do not rise as much, or as quickly, as prevailing interest rates. Unlike fixed-rate securities, floating-rate securities generally will not increase in value if interest rates decline. Changes in interest rates also will affect the amount of interest income the Fund earns on its floating-rate investments. Investing in foreign and/or emerging markets securities involves risks relating to interest rates, currency exchange rates, economic, and political conditions. These risks may increase share price volatility. Before investing, consider the product's investment objectives, risks, charges and expenses. Contact your advisor or Amundi Pioneer Asset Management, Inc., for a prospectus or summary prospectus containing this information. Read it carefully. 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. Past performance is no guarantee of future results. Pioneer Floating Rate Fund | Annual Report | 10/31/18 9 Portfolio Summary | 10/31/18 Portfolio Diversification -------------------------------------------------------------------------------- (As a percentage of total investments)* [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Senior Secured Floating Rate Loan Interests 85.1% U.S. Government and Agency Obligations 8.6% Corporate Bonds 3.1% Insurance-Linked Securities 1.6% Investment Companies 0.9% Collateralized Mortgage Obligations 0.4% Asset Backed Securities 0.3% Preferred Stock 0.0%+ Common Stock 0.0%+ + Amount rounds to less than 0.1%. 10 Largest Holdings -------------------------------------------------------------------------------- (As a percentage of total investments)* 1. United States Treasury Bills, 11/1/18 3.41% ------------------------------------------------------------------------------------------------- 2. United States Treasury Bills, 11/29/18 2.81 ------------------------------------------------------------------------------------------------- 3. United States Treasury Bills, 11/8/18 1.44 ------------------------------------------------------------------------------------------------- 4. Charter Communications Operating LLC (aka CCO Safari LLC), Term B Loan, 4.31% (LIBOR + 200 bps), 3/31/23 0.74 ------------------------------------------------------------------------------------------------- 5. Asurion LLC (fka Asurion Corp.), New Term Loan B7, 5.302% (LIBOR + 300 bps), 11/3/24 0.59 ------------------------------------------------------------------------------------------------- 6. CenturyLink, Inc., Initial Term B Loan, 5.052% (LIBOR + 275 bps), 1/31/25 0.58 ------------------------------------------------------------------------------------------------- 7. Bausch Health Cos., Inc. (fka Valeant Pharmaceuticals International, Inc.), Initial Term Loan, 5.274% (LIBOR + 300 bps), 6/2/25 0.55 ------------------------------------------------------------------------------------------------- 8. Scientific Games International, Inc., Initial Term B-5 Loan, 5.046% (LIBOR + 275 bps), 8/14/24 0.51 ------------------------------------------------------------------------------------------------- 9. Sprint Communications, Inc., Initial Term Loan, 4.813% (LIBOR + 250 bps), 2/2/24 0.49 ------------------------------------------------------------------------------------------------- 10. United States Treasury Bills, 1/24/19 0.49 ------------------------------------------------------------------------------------------------- * Excludes temporary cash investments and all derivative contracts except for options purchased. The Fund 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 Floating Rate Fund | Annual Report | 10/31/18 Prices and Distributions | 10/31/18 Net Asset Value per Share -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 10/31/18 10/31/17 -------------------------------------------------------------------------------- A $6.73 $6.80 -------------------------------------------------------------------------------- C $6.74 $6.80 -------------------------------------------------------------------------------- Y $6.75 $6.82 -------------------------------------------------------------------------------- Distributions per Share: 11/1/17-10/31/18 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains -------------------------------------------------------------------------------- A $0.2674 $ -- $ -- -------------------------------------------------------------------------------- C $0.2171 $ -- $ -- -------------------------------------------------------------------------------- Y $0.2888 $ -- $ -- -------------------------------------------------------------------------------- The S&P/LSTA Leveraged Performing Loan Index provides broad and comprehensive total return metrics of the U.S. universe of syndicated term loans. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. It is not possible to invest directly in an index. The index defined here pertains to the "Value of $10,000 Investment" and "Value of $5 Million Investment" charts on pages 12-14. Pioneer Floating Rate Fund | Annual Report | 10/31/18 11 Performance Update | 10/31/18 Class A Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Class A shares of Pioneer Floating Rate Fund at public offering price during the periods shown, compared to that of the S&P/LSTA Leveraged Performing Loan Index. Cumulative Total Returns (As of October 31, 2018) -------------------------------------------------------------------------------- Net Public S&P/LSTA Asset Offering Leveraged Value Price Performing Period (NAV) (POP) Loan Index -------------------------------------------------------------------------------- 10 years 6.08% 5.59% 7.91% 5 years 2.97 2.02 4.30 1 year 2.96 -1.67 4.78 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated March 1, 2018) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 1.03% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Floating S&P/LSTA Leveraged Rate Fund Performing Loan Index 10/08 $ 9,550 $ 10,000 10/09 $ 11,794 $ 13,162 10/10 $ 12,907 $ 14,664 10/11 $ 13,292 $ 15,136 10/12 $ 14,279 $ 16,446 10/13 $ 14,885 $ 17,345 10/14 $ 15,208 $ 17,939 10/15 $ 15,441 $ 18,213 10/16 $ 16,134 $ 19,417 10/17 $ 16,733 $ 20,436 10/18 $ 17,228 $ 21,413 Call 1-800-225-6292 or visit www.amundipioneer.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. POP returns reflect deduction of maximum 4.50% sales charge. NAV 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. Please refer to the financial highlights for a more current expense ratio. 12 Pioneer Floating Rate Fund | Annual Report | 10/31/18 Performance Update | 10/31/18 Class C Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Class C shares of Pioneer Floating Rate Fund during the periods shown, compared to that of the S&P/LSTA Leveraged Performing Loan Index. Cumulative Total Returns (As of October 31, 2018) -------------------------------------------------------------------------------- S&P/LSTA Leveraged If If Performing Period Held Redeemed Loan Index -------------------------------------------------------------------------------- 10 years 5.30% 5.30% 7.91% 5 years 2.22 2.22 4.30 1 year 2.35 2.35 4.78 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated March 1, 2018) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 1.78% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Floating S&P/LSTA Leveraged Rate Fund Performing Loan Index 10/08 $ 10,000 $ 10,000 10/09 $ 12,263 $ 13,162 10/10 $ 13,302 $ 14,664 10/11 $ 13,612 $ 15,136 10/12 $ 14,496 $ 16,446 10/13 $ 15,020 $ 17,345 10/14 $ 15,235 $ 17,939 10/15 $ 15,359 $ 18,213 10/16 $ 15,909 $ 19,417 10/17 $ 16,375 $ 20,436 10/18 $ 16,759 $ 21,413 Call 1-800-225-6292 or visit www.amundipioneer.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. NAV 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. Please refer to the financial highlights for a more current expense ratio. Pioneer Floating Rate Fund | Annual Report | 10/31/18 13 Performance Update | 10/31/18 Class Y Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 million investment made in Class Y shares of Pioneer Floating Rate Fund during the periods shown, compared to that of the S&P/LSTA Leveraged Performing Loan Index. Cumulative Total Returns (As of October 31, 2018) -------------------------------------------------------------------------------- Net S&P/LSTA Asset Leveraged Value Performing Period (NAV) Loan Index -------------------------------------------------------------------------------- 10 years 6.40% 7.91% 5 years 3.31 4.30 1 year 3.27 4.78 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated March 1, 2018) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 0.80% 0.71% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $5 Million Investment Pioneer Floating S&P/LSTA Leveraged Rate Fund Performing Loan Index 10/08 $ 5,000,000 $ 5,000,000 10/09 $ 6,184,750 $ 6,581,070 10/10 $ 6,785,591 $ 7,332,074 10/11 $ 6,996,417 $ 7,567,868 10/12 $ 7,540,632 $ 8,222,918 10/13 $ 7,900,036 $ 8,672,551 10/14 $ 8,097,913 $ 8,969,654 10/15 $ 8,253,484 $ 9,106,721 10/16 $ 8,653,792 $ 9,708,458 10/17 $ 9,004,105 $ 10,217,784 10/18 $ 9,298,987 $ 10,706,254 Call 1-800-225-6292 or visit www.amundipioneer.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 March 1, 2019, for Class Y shares. There can be no assurance that Amundi 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. Please refer to the financial highlights for a more current expense ratio. 14 Pioneer Floating Rate Fund | Annual Report | 10/31/18 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 Floating Rate Fund Based on actual returns from May 1, 2018, through October 31, 2018. -------------------------------------------------------------------------------- Share Class A C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 Value on 5/1/18 -------------------------------------------------------------------------------- Ending Account $1,012.49 $1,010.37 $1,014.04 Value (after expenses) on 10/31/18 -------------------------------------------------------------------------------- Expenses Paid $ 5.12 $ 8.92 $ 3.55 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 1.01%, 1.76% and 0.70% multiplied by the average account value over the period, multiplied by 184/365 (to reflect the partial year period). Pioneer Floating Rate Fund | Annual Report | 10/31/18 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 Floating Rate Fund Based on a hypothetical 5% return per year before expenses, reflecting the period from May 1, 2018, through October 31, 2018. -------------------------------------------------------------------------------- Share Class A C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 Value on 5/1/18 -------------------------------------------------------------------------------- Ending Account $1,020.11 $1,016.33 $1,021.68 Value (after expenses) on 10/31/18 -------------------------------------------------------------------------------- Expenses Paid $ 5.14 $ 8.94 $ 3.57 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 1.01%, 1.76% and 0.70% multiplied by the average account value over the period, multiplied by 184/365 (to reflect the partial year period). 16 Pioneer Floating Rate Fund | Annual Report | 10/31/18 Schedule of Investments | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ UNAFFILIATED ISSUERS -- 105.6% SENIOR SECURED FLOATING RATE LOAN INTERESTS -- 89.9% of Net Assets*(a) AUTOMOBILES & COMPONENTS -- 2.4% Auto Parts & Equipment -- 1.6% 1,135,793 Allison Transmission, Inc., New Term Loan, 4.04% (LIBOR + 175 bps), 9/23/22 $ 1,142,448 1,474,477 American Axle & Manufacturing, Inc., Tranche B Term Loan, 4.621% (LIBOR + 225 bps), 4/6/24 1,474,477 1,528,297 Cooper-Standard Automotive, Inc., Additional Term B-1 Loan, 4.302% (LIBOR + 200 bps), 11/2/23 1,532,836 1,156,940 Energy Acquisition LP, First Lien Initial Term Loan, 6.636% (LIBOR + 425 bps), 6/26/25 1,165,617 1,477,500 Innovative Xcessories & Services LLC, Term Loan, 7.04% (LIBOR + 475 bps), 11/29/22 1,485,811 1,579,287 Superior Industries International, Inc., Replacement Term Loan, 6.302% (LIBOR + 400 bps), 5/22/24 1,585,210 2,538,689 TI Group Automotive Systems LLC, Initial US Term Loan, 4.802% (LIBOR + 250 bps), 6/30/22 2,529,169 2,439,937 Tower Automotive Holdings USA LLC, Initial Term Loan, 5.063% (LIBOR + 275 bps), 3/7/24 2,440,955 1,807,917 Visteon Corp., New Term Loan, 4.049% (LIBOR + 175 bps), 3/25/24 1,796,617 --------------- $ 15,153,140 ------------------------------------------------------------------------------------------------------ Automobile Manufacturers -- 0.4% 1,526,286 FCA US LLC (fka Chrysler Group LLC), Tranche B Term Loan, 4.3% (LIBOR + 200 bps), 12/31/18 $ 1,529,385 1,000,000 Honeywell Technologies S.a r.l., Dollar Tranche B Term Loan, 4.89% (LIBOR + 250 bps), 9/27/25 999,375 1,213,333 Octavius Corp., (Winnebago Industries) New Tranche B Term Loan, 5.811% (LIBOR + 350 bps), 11/8/23 1,219,400 --------------- $ 3,748,160 ------------------------------------------------------------------------------------------------------ Tires & Rubber -- 0.4% 3,325,000 Goodyear Tire & Rubber Co., Second Lien Term Loan, 4.32% (LIBOR + 200 bps), 3/3/25 $ 3,308,392 --------------- Total Automobiles & Components $ 22,209,692 ------------------------------------------------------------------------------------------------------ CAPITAL GOODS -- 11.4% Aerospace & Defense -- 2.4% 1,341,591 Accudyne Industries Borrower SCA/Accudyne Industries LLC (fka Silver II US Holdings LLC), Initial Term Loan, 5.302% (LIBOR + 300 bps), 8/18/24 $ 1,338,478 3,105,978 Alion Science and Technology Corp., First Lien Term Loan, 6.802% (LIBOR + 450 bps), 8/19/21 3,125,390 3,217,583 Constellis Holdings LLC, First Lien Term B Loan, 7.386% (LIBOR + 500 bps), 4/21/24 3,210,881 2,534,928 DAE Aviation Holdings, Inc., Initial Term Loan, 6.05% (LIBOR + 375 bps), 7/7/22 2,548,962 The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 17 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Aerospace & Defense -- (continued) 1,068,157 DynCorp International, Inc., Term Loan B2, 8.282% (LIBOR + 600 bps), 7/7/20 $ 1,072,162 289,319 Engility Corp. (fka TASC, Inc.), Term B2 Loan, 5.052% (LIBOR + 275 bps), 8/14/23 290,103 1,270,816 Leidos Innovations Corp., Term Loan B, 4.063% (LIBOR + 175 bps), 8/22/25 1,277,571 2,612,707 MacDonald, Dettwiler and Associates, Ltd., Initial Term B Loan, 5.148% (LIBOR + 275 bps), 10/4/24 2,548,204 992,500 MRO Holdings, Inc., Initial Term Loan, 7.636% (LIBOR + 525 bps), 10/25/23 999,944 2,705,337 Transdigm, Inc., New Tranche F Term Loan, 4.802% (LIBOR + 250 bps), 6/9/23 2,696,423 1,417,749 Transdigm, Inc., New Tranche G Term Loan, 4.802% (LIBOR + 250 bps), 8/22/24 1,413,230 2,350,000 WP CPP Holdings, LLC, First Lien Initial Term Loan, 6.279% (LIBOR + 375 bps), 4/30/25 2,360,648 --------------- $ 22,881,996 ------------------------------------------------------------------------------------------------------ Building Products -- 3.0% 2,145,000 Armstrong World Industries, Inc., Term Loan B, 5.087% (LIBOR + 275 bps), 3/31/23 $ 2,147,681 2,248,076 Atkore International, Inc., First Lien Initial Incremental Term Loan, 5.14% (LIBOR + 275 bps), 12/22/23 2,252,291 3,733,120 Beacon Roofing Supply, Inc., Initial Term Loan, 4.527% (LIBOR + 225 bps), 1/2/25 3,705,454 3,238,865 Builders FirstSource, Inc., Refinancing Term Loan, 5.386% (LIBOR + 300 bps), 2/29/24 3,213,900 2,244,375 Hamilton Holdco LLC (Reece International Pty, Ltd.), Term Loan, 4.4% (LIBOR + 200 bps), 7/2/25 2,246,480 1,666,625 Janus International Group LLC, Initial First Lien Term Loan, 5.302% (LIBOR + 300 bps), 2/12/25 1,643,709 2,686,500 NCI Building Systems, Inc., Initial Term Loan, 4.302% (LIBOR + 200 bps), 2/7/25 2,685,380 2,635,746 Quikrete Holdings, Inc., First Lien Initial Term Loan, 5.052% (LIBOR + 275 bps), 11/15/23 2,629,863 1,312,584 Siteone Landscape Supply LLC, Tranche E Term Loan, 5.03% (LIBOR + 275 bps), 10/29/24 1,314,634 1,246,875 SRS Distribution, Inc., Initial Term Loan, 5.552% (LIBOR + 325 bps), 5/23/25 1,222,890 3,595,246 Summit Materials LLC, New Term Loan, 4.302% (LIBOR + 200 bps), 11/21/24 3,583,450 1,481,287 Unifrax I LLC, Initial Dollar Term Loan, 5.886% (LIBOR + 350 bps), 4/4/24 1,485,917 --------------- $ 28,131,649 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 18 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Construction & Engineering -- 0.3% 1,832,377 Installed Building Products, Inc., Tranche B-2 Term Loan, 4.802% (LIBOR + 250 bps), 4/15/25 $ 1,821,689 996,250 Verra Mobility Corporation (aka American Traffic Solutions), First Lien Initial Term Loan, 6.045% (LIBOR + 375 bps), 2/28/25 1,002,974 --------------- $ 2,824,663 ------------------------------------------------------------------------------------------------------ Construction & Farm Machinery & Heavy Trucks -- 0.8% 1,960,522 Clark Equipment Co. (aka Doosan Bobcat, Inc.), Repriced Term Loan, 4.377% (LIBOR + 200 bps), 5/18/24 $ 1,956,846 968,750 Commercial Vehicle Group, Inc., (CVG) Initial Term Loan, 8.302% (LIBOR + 600 bps), 4/12/23 974,805 4,163,703 Navistar, Inc., Tranche B Term Loan, 5.78% (LIBOR + 350 bps), 11/6/24 4,174,112 355,967 Terex Corp., Incremental US Term Loan, 4.294% (LIBOR + 200 bps), 1/31/24 355,522 --------------- $ 7,461,285 ------------------------------------------------------------------------------------------------------ Electrical Components & Equipment -- 1.5% 1,543,936 Convergint Technologies LLC, First Lien Initial Term Loan, 5.302% (LIBOR + 300 bps), 2/3/25 $ 1,534,286 2,565,543 Dell International LLC, Refinancing Term B Loan, 4.31% (LIBOR + 200 bps), 9/7/23 2,565,010 951,825 Diebold Nixdorf, Inc. (fka Diebold, Inc.), New Dollar Term B Loan, 5.063% (LIBOR + 275 bps), 11/6/23 828,087 1,750,000 GoodRx, Inc., First Lien Initial Term Loan, 5.283% (LIBOR + 300 bps), 10/10/25 1,759,844 1,406,475 Pelican Products, Inc., First Lien Term Loan, 5.774% (LIBOR + 350 bps), 5/1/25 1,409,405 2,543,625 Southwire Co., Initial Term Loan, 4.29% (LIBOR + 200 bps), 5/19/25 2,553,481 3,010,185 WireCo WorldGroup, Inc., First Lien Initial Term Loan, 7.302% (LIBOR + 500 bps), 9/29/23 3,038,406 --------------- $ 13,688,519 ------------------------------------------------------------------------------------------------------ Industrial Conglomerates -- 1.8% 1,676,603 AVSC Holding Corp., First Lien Initial Term Loan, 5.566% (LIBOR + 325 bps), 3/3/25 $ 1,676,603 2,014,253 Blount International, Inc., New Refinancing Term Loan, 6.052% (LIBOR + 375 bps), 4/12/23 2,034,396 2,319,472 DTI Holdco, Inc., Replacement B-1 Term Loan, 7.276% (LIBOR + 475 bps), 9/29/23 2,232,492 748,125 EaglePicher Technologies LLC, First Lien Initial Term Loan, 5.552% (LIBOR + 325 bps), 3/8/25 749,683 2,047,197 Filtration Group Corp., Initial Dollar Term Loan, 5.302% (LIBOR + 300 bps), 3/29/25 2,058,286 1,584,794 Gates Global LLC, Initial B-2 Dollar Term Loan, 5.052% (LIBOR + 275 bps), 4/1/24 1,589,321 The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 19 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Industrial Conglomerates -- (continued) 843,750 Hyster-Yale Group, Inc., Term Loan, 5.552% (LIBOR + 325 bps), 5/30/23 $ 846,914 1,821,605 Milacron LLC, Term B Loan, 4.802% (LIBOR + 250 bps), 9/28/23 1,825,021 1,732,635 ProAmpac PG Borrower LLC, First Lien Initial Term Loan, 5.841% (LIBOR + 350 bps), 11/20/23 1,737,689 2,035,483 Shape Technologies Group, Inc., Initial Term Loan, 5.305% (LIBOR + 300 bps), 4/20/25 2,034,210 440,250 Thermon Industries, Inc., Term Loan B, 6.006% (LIBOR + 375 bps), 10/30/24 443,552 --------------- $ 17,228,167 ------------------------------------------------------------------------------------------------------ Industrial Machinery -- 1.0% 1,985,000 Circor International, Inc., Initial Term Loan, 5.783% (LIBOR + 350 bps), 12/11/24 $ 1,986,241 1,400,289 Columbus McKinnon Corp., Repriced Term Loan, 4.886% (LIBOR + 250 bps), 1/31/24 1,403,789 1,895,253 Gardner Denver, Inc., Tranche B-1 Dollar Term Loan, 5.052% (LIBOR + 275 bps), 7/30/24 1,902,529 699,836 NN, Inc., Tranche B Term Loan, 6.052% (LIBOR + 375 bps), 10/19/22 701,914 1,763,877 Tank Holding Corp., Replacement Term Loan, 5.811% (LIBOR + 350 bps), 3/16/22 1,769,665 2,049,201 Welbilt, Inc. (fka Manitowoc Foodservice, Inc.), Term B Loan, 4.782% (LIBOR + 250 bps), 10/23/25 2,049,201 --------------- $ 9,813,339 ------------------------------------------------------------------------------------------------------ Trading Companies & Distributors -- 0.6% 1,200,000 HD Supply, Inc., Term B-5 Loan, 4.03% (LIBOR + 175 bps), 10/17/23 $ 1,201,000 1,000,000(b) Hertz Corp., Tranche Term B-1 Loan, 6/30/23 996,328 1,857,558 Nexeo Solutions LLC, Term B-1 Loan, 5.659% (LIBOR + 325 bps), 6/9/23 1,863,749 1,000,000(b) United Rentals, Inc., Term Loan B, 10/3/25 1,005,625 182,720 WESCO Distribution, Inc., Tranche B-1 Term Loan, 5.302% (LIBOR + 300 bps), 12/12/19 182,948 --------------- $ 5,249,650 --------------- Total Capital Goods $ 107,279,268 ------------------------------------------------------------------------------------------------------ COMMERCIAL & PROFESSIONAL SERVICES -- 1.9% Diversified Support Services -- 0.4% 1,017,477 Access CIG LLC, First Lien Term B Loan, 6.052% (LIBOR + 375 bps), 2/27/25 $ 1,022,193 1,412,694 Aristocrat Leisure, Ltd., Term B-3 Loan, 4.219% (LIBOR + 175 bps), 10/19/24 1,409,402 976,933 Patriot Container Corp., First Lien Closing Date Term Loan, 5.787% (LIBOR + 350 bps), 3/20/25 982,734 --------------- $ 3,414,329 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 20 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Environmental & Facilities Services -- 1.2% 4,001,770 Albany Molecular Research, Inc., First Lien Initial Term Loan, 5.552% (LIBOR + 325 bps), 8/30/24 $ 4,008,272 220,995 GFL Environmental, Inc., Delayed Draw Term Loan, 7.0% (PRIME + 175 bps), 5/30/25 218,301 2,374,558 GFL Environmental, Inc., Effective Date Incremental Term Loan, 5.136% (LIBOR + 275 bps), 5/30/25 2,345,617 1,866,037 Infiltrator Water Technologies LLC, First Lien Term B-2 Loan, 5.386% (LIBOR + 300 bps), 5/27/22 1,875,367 1,000,000(b) Tunnel Hill Partners LP, Cov-Lite Term Loan B, 10/1/25 1,005,000 2,001,461 Wrangler Buyer Corp. (aka Waste Industries USA, Inc.), Initial Term Loan, 5.006% (LIBOR + 275 bps), 9/27/24 2,004,798 --------------- $ 11,457,355 ------------------------------------------------------------------------------------------------------ Human Resource & Employment Services -- 0.3% 750,805 On Assignment, Inc., Initial Term B-1 Loan, 4.302% (LIBOR + 200 bps), 6/3/22 $ 754,793 191,484 On Assignment, Inc., Initial Term B-2 Loan, 4.302% (LIBOR + 200 bps), 4/2/25 192,043 2,118,115 STG-Fairway Acquisitions, Inc., First Lien Term Loan, 7.777% (LIBOR + 525 bps), 6/30/22 2,120,762 --------------- $ 3,067,598 --------------- Total Commercial & Professional Services $ 17,939,282 ------------------------------------------------------------------------------------------------------ COMMERCIAL SERVICES & SUPPLIES -- 1.8% Diversified Support Services -- 0.9% 5,891,602 Asurion LLC (fka Asurion Corp.), New Term Loan B7, 5.302% (LIBOR + 300 bps), 11/3/24 $ 5,907,804 575,155 Asurion LLC (fka Asurion Corp.), Replacement B-6 Term Loan, 5.302% (LIBOR + 300 bps), 11/3/23 576,593 243,965 IAP Worldwide Services, Inc., Second Lien Term Loan, 8.886% (LIBOR + 650 bps), 7/18/19 241,525 1,953,056 KAR Auction Services, Inc., Tranche B-5 Term Loan, 4.938% (LIBOR + 250 bps), 3/9/23 1,957,303 --------------- $ 8,683,225 ------------------------------------------------------------------------------------------------------ Environmental & Facilities Services -- 0.6% 2,347,032 Advanced Disposal Services, Inc. (fka ADS Waste Holdings, Inc.), Additional Term Loan, 4.46% (LIBOR + 225 bps), 11/10/23 $ 2,349,966 1,786,278 Clean Harbors, Inc., Initial Term Loan, 4.052% (LIBOR + 175 bps), 6/30/24 1,791,583 1,693,108 WCA Waste Systems, Inc., Initial Term Loan, 4.802% (LIBOR + 250 bps), 8/11/23 1,688,875 --------------- $ 5,830,424 ------------------------------------------------------------------------------------------------------ Office Services & Supplies -- 0.1% 496,250 Diamond (BC) BV Initial USD Term Loan, 5.526% (LIBOR + 300 bps), 9/6/24 $ 490,667 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 21 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Security & Alarm Services -- 0.2% 2,277,764 GW Honos Security Corp. (Garda World Security Corp.), Term B Loan, 5.821% (LIBOR + 350 bps), 5/24/24 $ 2,288,085 --------------- Total Commercial Services & Supplies $ 17,292,401 ------------------------------------------------------------------------------------------------------ CONSUMER DURABLES & APPAREL -- 1.3% Apparel, Accessories & Luxury Goods -- 0.1% 992,500 Hanesbrands Inc., New Term Loan B, 4.052% (LIBOR + 175 bps), 12/16/24 $ 994,155 ------------------------------------------------------------------------------------------------------ Homebuilding -- 0.2% 2,250,000 Interior Logic Group Holdings IV LLC, Initial Term Loan, 6.391% (LIBOR + 400 bps), 5/30/25 $ 2,248,594 ------------------------------------------------------------------------------------------------------ Household Appliances -- 0.3% 1,981,870 Global Appliance, Inc., Tranche B Term Loan, 6.31% (LIBOR + 400 bps), 9/29/24 $ 1,969,483 645,124 Ring Container Technologies Group, LLC, First Lien Initial Term Loan, 5.052% (LIBOR + 275 bps), 10/31/24 645,931 --------------- $ 2,615,414 ------------------------------------------------------------------------------------------------------ Housewares & Specialties -- 0.5% 505,452 Prestige Brands, Inc., Term B-4 Loan, 4.302% (LIBOR + 200 bps), 1/26/24 $ 506,580 2,304,751 Reynolds Group Holdings, Inc., Incremental US Term Loan, 5.052% (LIBOR + 275 bps), 2/5/23 2,309,612 1,995,000 SIWF Holdings, Inc., First Lien Initial Term Loan, 6.54% (LIBOR + 425 bps), 6/15/25 2,013,703 --------------- $ 4,829,895 ------------------------------------------------------------------------------------------------------ Leisure Products -- 0.2% 1,372,126 Bombardier Recreational Products, Inc., Term B Loan, 4.3% (LIBOR + 200 bps), 5/23/25 $ 1,370,696 --------------- Total Consumer Durables & Apparel $ 12,058,754 ------------------------------------------------------------------------------------------------------ CONSUMER SERVICES -- 8.0% Casinos & Gaming -- 2.5% 4,561,960 Boyd Gaming Corp., Refinancing Term B Loan, 4.467% (LIBOR + 225 bps), 9/15/23 $ 4,575,400 496,250 Churchill Downs Inc., Term B Facility Loan, 4.31% (LIBOR + 200 bps), 12/27/24 498,111 2,962,500 CityCenter Holdings LLC, Term B Loan, 4.552% (LIBOR + 225 bps), 4/18/24 2,960,186 2,018,360 Eldorado Resorts, Inc., Term Loan, 4.563% (LIBOR + 225 bps), 4/17/24 2,023,406 2,230,155 Golden Nugget, Inc. (aka Landry's Inc.), Initial Term Loan B, 5.23% (LIBOR + 275 bps), 10/4/23 2,235,563 2,500,000 Penn National Gaming, Inc., Term B-1 Facility Loan, 4.581% (LIBOR + 225 bps), 10/15/25 2,510,353 5,158,757 Scientific Games International, Inc., Initial Term B-5 Loan, 5.046% (LIBOR + 275 bps), 8/14/24 5,117,915 The accompanying notes are an integral part of these financial statements. 22 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Casinos & Gaming -- (continued) 1,995,000 Stars Group Holdings BV, USD Term Loan, 5.886% (LIBOR + 350 bps), 7/10/25 $ 2,003,728 1,949,016 Station Casinos LLC, Term B Facility Loan, 4.81% (LIBOR + 250 bps), 6/8/23 1,950,561 --------------- $ 23,875,223 ------------------------------------------------------------------------------------------------------ Education Services -- 1.0% 3,913,857 Bright Horizons Family Solutions LLC (fka Bright Horizons Family Solutions, Inc.), Term B Loan, 4.052% (LIBOR + 175 bps), 11/7/23 $ 3,920,585 2,713,755 Laureate Education, Inc., Series 2024 Term Loan, 6.027% (LIBOR + 350 bps), 4/26/24 2,722,574 2,754,710 McGraw-Hill Global Education Holdings LLC, First Lien Term B Loan, 6.302% (LIBOR + 400 bps), 5/4/22 2,642,555 --------------- $ 9,285,714 ------------------------------------------------------------------------------------------------------ Hotels, Resorts & Cruise Lines -- 0.8% 2,063,250 Four Seasons Holdings, Inc., 2013 First Lien Term Loan, 4.302% (LIBOR + 200 bps), 11/30/23 $ 2,065,185 953,274 Hilton Worldwide Finance LLC, Series B-2 Term Loan, 4.031% (LIBOR + 175 bps), 10/25/23 955,127 1,200,000 Marriott Ownership Resorts, Inc., Initial Term Loan, 4.552% (LIBOR + 225 bps), 8/29/25 1,206,000 2,395,843 Sabre GLBL, Inc., (fka Sabre, Inc.), 2018 Other Term B Loan, 4.302% (LIBOR + 200 bps), 2/22/24 2,398,195 700,000 Wyndham Hotels & Resorts, Inc., Term Loan B, 4.052% (LIBOR + 175 bps), 5/30/25 700,613 --------------- $ 7,325,120 ------------------------------------------------------------------------------------------------------ Leisure Facilities -- 1.2% 1,770,563 24 Hour Fitness Worldwide, Inc., Term Loan, 5.802% (LIBOR + 350 bps), 5/30/25 $ 1,777,202 1,568,000 Cedar Fair LP, US Term B Loan, 4.052% (LIBOR + 175 bps), 4/13/24 1,577,800 4,649,392 Fitness International LLC, Term B Loan, 5.552% (LIBOR + 325 bps), 4/18/25 4,663,438 1,692,292 Life Time Fitness, Inc., 2017 Refinancing Term Loan, 5.063% (LIBOR + 275 bps), 6/10/22 1,695,201 1,457,976 Six Flags Theme Parks, Inc., Tranche B Term Loan, 4.26% (LIBOR + 175 bps), 6/30/22 1,463,808 --------------- $ 11,177,449 ------------------------------------------------------------------------------------------------------ Restaurants -- 1.0% 3,362,816 1011778 BC Unlimited Liability Co. (New Red Finance, Inc.) (aka Burger King/Tim Hortons), Term B-3 Loan, 4.552% (LIBOR + 225 bps), 2/16/24 $ 3,353,360 1,995,000 Arby's Restaurant Group, Inc., Term B Loan, 5.46% (LIBOR + 325 bps), 2/5/25 1,995,712 The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 23 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Restaurants -- (continued) 696,750 Dhanani Group, Inc., Term Loan, 6.052% (LIBOR + 375 bps), 7/20/25 $ 694,137 3,192,601 KFC Holdings Co. (aka Yum! Brands), 2018 Term Loan B, 4.037% (LIBOR + 175 bps), 4/3/25 3,197,090 740,625 NPC International, Inc., First Lien Initial Term Loan, 5.802% (LIBOR + 350 bps), 4/19/24 744,328 --------------- $ 9,984,627 ------------------------------------------------------------------------------------------------------ Specialized Consumer Services -- 1.5% 1,566,056 Allied Universal Holdco LLC (fka USAGM Holdco LLC), First Lien Initial Term Loan, 6.136% (LIBOR + 375 bps), 7/28/22 $ 1,561,652 1,250,000 Allied Universal Holdco LLC (fka USAGM Holdco LLC), Incremental Term Loan, 6.641% (LIBOR + 425 bps), 7/28/22 1,244,791 2,554,941 Creative Artists Agency LLC, Refinancing Term Loan, 5.29% (LIBOR + 300 bps), 2/15/24 2,564,921 1,000,000 frontdoor, Inc., Initial Term Loan, 4.813% (LIBOR + 250 bps), 8/16/25 1,007,500 4,771,385 KUEHG Corp. (fka KC MergerSub, Inc.), Term B-3 Loan, 6.136% (LIBOR + 375 bps), 2/21/25 4,801,631 2,795,765 Prime Security Services Borrower LLC, First Lien 2016-2 Refinancing Term B-1 Loan, 5.052% (LIBOR + 275 bps), 5/2/22 2,801,008 --------------- $ 13,981,503 --------------- Total Consumer Services $ 75,629,636 ------------------------------------------------------------------------------------------------------ DIVERSIFIED FINANCIALS -- 5.6% Asset Management & Custody Banks -- 0.3% 2,527,216 Baring Private Equity Asia VI Holdings, Ltd., First Lien Initial Dollar Term Loan, 5.302% (LIBOR + 300 bps), 10/26/22 $ 2,536,693 ------------------------------------------------------------------------------------------------------ Consumer Finance -- 0.2% 1,895,250 Blackhawk Network Holdings, Inc., First Lien Term Loan, 5.386% (LIBOR + 300 bps), 6/15/25 $ 1,901,409 ------------------------------------------------------------------------------------------------------ Diversified Capital Markets -- 1.1% 4,596,093 Avolon TLB Borrower 1 (US) LLC, Term B-3 Loan, 4.28% (LIBOR + 200 bps), 1/15/25 $ 4,589,392 868,438 Clipper Acquisitions Corp. (aka TCW Group, Inc.), Term B-1 Loan, 4.029% (LIBOR + 175 bps), 12/27/24 869,516 831,599 FinCo I LLC (aka Fortress Investment Group), 2018 Replacement Term Loan, 4.302% (LIBOR + 200 bps), 12/27/22 832,327 1,617,228 Freedom Mortgage Corp., Initial Term Loan, 7.052% (LIBOR + 475 bps), 2/23/22 1,631,378 1,307,438 Pre-Paid Legal Services, Inc. (aka Legal/shield), First Lien Initial Term Loan, 5.552% (LIBOR + 325 bps), 5/1/25 1,316,426 1,416,250 Trico Group LLC, First Lien Initial Term Loan, 8.813% (LIBOR + 650 bps), 2/2/24 1,419,791 --------------- $ 10,658,830 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 24 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Investment Banking & Brokerage -- 0.5% 1,238,750 Duff & Phelps Investment Management Co., Initial Term Loan, 5.552% (LIBOR + 325 bps), 2/13/25 $ 1,239,414 1,768,875 Guggenheim Partners Investment Management Holdings LLC, Term B Loan, 5.052% (LIBOR + 275 bps), 7/21/23 1,782,142 1,777,050 LPL Holdings, Inc., Tranche B Term Loan, 4.53% (LIBOR + 225 bps), 9/23/24 1,782,603 --------------- $ 4,804,159 ------------------------------------------------------------------------------------------------------ Other Diversified Financial Services -- 0.8% 673,724 Delos Finance S.a r.l., New Term Loan, 4.136% (LIBOR + 175 bps), 10/6/23 $ 675,529 4,194,053 Fly Funding II S.a r.l., Term Loan, 4.34% (LIBOR + 200 bps), 2/9/23 4,193,181 2,416,986 Livingston International Inc., First Lien Refinancing Term B-3 Loan, 8.136% (LIBOR + 575 bps), 3/20/20 2,416,986 --------------- $ 7,285,696 ------------------------------------------------------------------------------------------------------ Specialized Finance -- 2.5% 1,828,571 CTC AcquiCo GmbH, Facility B2, 5.565% (LIBOR + 325 bps), 3/7/25 $ 1,824,000 1,462,121 DBRS, Ltd., Initial Term Loan, 7.563% (LIBOR + 525 bps), 3/4/22 1,465,776 3,000,000(b) Encino Acquisition Partners Holdings LLC, Second Lien Term Loan, 9/26/25 3,060,000 500,000 GBT Group Services B.V. (aka Amex GBT), Initial Term Loan, 4.838% (LIBOR + 250 bps), 8/13/25 503,750 1,050,000 Globallogic Holdings, Inc., Term B Loan, 5.552% (LIBOR + 325 bps), 8/1/25 1,058,531 650,000 Herbalife Nutrition Ltd., Term Loan B, 5.552% (LIBOR + 325 bps), 8/18/25 653,250 2,145,000 LTI Holdings, Inc., First Lien Initial Term Loan, 5.802% (LIBOR + 350 bps), 9/6/25 2,146,341 3,967,537 Parfums Holding Co., Inc., First Lien Initial Term Loan, 6.529% (LIBOR + 425 bps), 6/30/24 3,989,030 1,728,125 Peraton Corp. (fka MHVC Acquisition Corp.), First Lien Initial Term Loan, 7.64% (LIBOR + 525 bps), 4/29/24 1,721,645 1,050,000 Sigma Holdco BV (aka Flora Foods), Facility B2, 5.398% (LIBOR + 300 bps), 7/2/25 1,048,195 2,263,320 Trans Union LLC, 2017 Replacement Term B-3 Loan, 4.302% (LIBOR + 200 bps), 4/10/23 2,262,754 498,750 Trans Union LLC, 2018 Incremental Term B-4 Loan, 4.302% (LIBOR + 200 bps), 6/19/25 498,616 3,931,818 VICI Properties 1 LLC, Term B Loan, 4.28% (LIBOR + 200 bps), 12/20/24 3,927,517 --------------- $ 24,159,405 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 25 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Systems Software -- 0.2% 1,703,337 Avast Software BV, 2018 Refinancing Dollar Term Loan, 4.886% (LIBOR + 250 bps), 9/29/23 $ 1,711,853 --------------- Total Diversified Financials $ 53,058,045 ------------------------------------------------------------------------------------------------------ ENERGY -- 2.4% Integrated Oil & Gas -- 0.5% 1,400,000(b) BCP Raptor II LLC, Term Loan B, 10/22/25 $ 1,398,250 1,736,875 Medallion Midland Acquisition LLC, Initial Term Loan, 5.552% (LIBOR + 325 bps), 10/30/24 1,724,934 1,375,000 NorthRiver Midstream Finance LP, Initial Term B Loan, 5.646% (LIBOR + 325 bps), 10/1/25 1,384,110 --------------- $ 4,507,294 ------------------------------------------------------------------------------------------------------ Oil & Gas Drilling -- 0.5% 1,000,000 Gavilan Resources LLC, Second Lien Initial Term Loan, 8.28% (LIBOR + 600 bps), 3/1/24 $ 941,250 3,950,000 Traverse Midstream Partners LLC, Advance Term Loan, 6.6% (LIBOR + 400 bps), 9/27/24 3,983,946 --------------- $ 4,925,196 ------------------------------------------------------------------------------------------------------ Oil & Gas Equipment & Services -- 0.4% 1,142,169 Apergy Corp., Initial Term Loan, 4.813% (LIBOR + 250 bps), 5/9/25 $ 1,144,548 1,436,468 Keane Group Holdings LLC, Initial Term Loan, 6.063% (LIBOR + 375 bps), 5/25/25 1,396,965 1,492,500 McDermott International, Inc., Term Loan, 7.302% (LIBOR + 500 bps), 5/12/25 1,482,052 --------------- $ 4,023,565 ------------------------------------------------------------------------------------------------------ Oil & Gas Exploration & Production -- 0.2% 750,000 California Resources Corp., Term Loan, 12.67% (LIBOR + 1,038 bps), 12/31/21 $ 836,250 497,500 Lucid Energy Group II Borrower LLC, Initial Term Loan, 5.28% (LIBOR + 300 bps), 2/17/25 496,561 111,325 MEG Energy Corp., Initial Term Loan, 5.81% (LIBOR + 350 bps), 12/31/23 111,720 --------------- $ 1,444,531 ------------------------------------------------------------------------------------------------------ Oil & Gas Refining & Marketing -- 0.3% 2,686,500 Delek US Holdings, Inc., Initial Term Loan, 4.552% (LIBOR + 225 bps), 3/31/25 $ 2,689,299 ------------------------------------------------------------------------------------------------------ Oil & Gas Storage & Transportation -- 0.5% 2,857,896 Energy Transfer Equity LP, Refinanced Term Loan, 4.302% (LIBOR + 200 bps), 2/2/24 $ 2,861,292 2,118,195 Gulf Finance LLC, Tranche B Term Loan, 7.64% (LIBOR + 525 bps), 8/25/23 1,752,806 The accompanying notes are an integral part of these financial statements. 26 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Oil & Gas Storage & Transportation -- (continued) 555,333 Summit Midstream Partners Holdings LLC, Term Loan Credit Facility, 8.302% (LIBOR + 600 bps), 5/13/22 $ 558,804 --------------- $ 5,172,902 --------------- Total Energy $ 22,762,787 ------------------------------------------------------------------------------------------------------ FOOD & STAPLES RETAILING -- 1.1% Drug Retail -- 0.1% 1,320,688 H-Food Holdings LLC (aka Hearthside Food Solutions LLC), Initial Term Loan, 5.302% (LIBOR + 300 bps), 5/23/25 $ 1,300,465 ------------------------------------------------------------------------------------------------------ Food Distributors -- 0.3% 1,776,076 CSM Bakery Solutions, Ltd., First Lien Term Loan, 6.41% (LIBOR + 400 bps), 7/3/20 $ 1,713,913 1,600,000 United Natural Foods, Inc., Initial Term Loan, 6.552% (LIBOR + 425 bps), 10/22/25 1,502,000 --------------- $ 3,215,913 ------------------------------------------------------------------------------------------------------ Food Retail -- 0.7% 985,031 Albertson's LLC, 2017-1 Term B-5 Loan, 5.381% (LIBOR + 300 bps), 12/21/22 $ 984,724 2,993,881 Albertson's LLC, 2017-1 Term B-6 Loan, 5.311% (LIBOR + 300 bps), 6/22/23 2,980,316 1,250,000(b) Albertson's LLC, Term Loan B7, 10/29/25 1,241,931 967,688 Packers Holdings LLC, Initial Term Loan, 5.277% (LIBOR + 300 bps), 12/4/24 969,199 --------------- $ 6,176,170 --------------- Total Food & Staples Retailing $ 10,692,548 ------------------------------------------------------------------------------------------------------ FOOD, BEVERAGE & TOBACCO -- 2.6% Agricultural Products -- 0.2% 1,657,857 Darling Ingredients, Inc. (fka Darling International, Inc.), Term B Loan, 4.31% (LIBOR + 200 bps), 12/18/24 $ 1,672,364 ------------------------------------------------------------------------------------------------------ Distillers & Vintners -- 0.1% 739,984 Arterra Wines Canada, Inc. (fka 9941762 Canada, Inc.), First Lien USD Term B-1 Loan, 5.088% (LIBOR + 275 bps), 12/15/23 $ 742,990 ------------------------------------------------------------------------------------------------------ Packaged Foods & Meats -- 2.2% 500,000 8th Avenue Food & Provisions, Inc., First Lien Term Loan, 6.006% (LIBOR + 375 bps), 10/1/25 $ 505,312 3,819,056 Chobani LLC, First Lien New Term Loan, 5.802% (LIBOR + 350 bps), 10/10/23 3,739,092 2,253,639 CTI Foods Holding Co., LLC, First Lien Term Loan, 6.1% (LIBOR + 350 bps), 6/29/20 1,825,448 1,682,284 Dole Food Co., Inc., Tranche B Term Loan, 5.049% (LIBOR + 275bps/PRIME + 175 bps), 4/6/24 1,680,312 2,163,150 Give and Go Prepared Foods Corp., First Lien 2017 Term Loan, 6.636% (LIBOR + 425 bps), 7/29/23 1,917,092 4,124,393 JBS USA Lux SA (fka JBS USA LLC), Initial Term Loan, 4.844% (LIBOR + 250 bps), 10/30/22 4,129,227 The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 27 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Packaged Foods & Meats -- (continued) 2,739,248 Post Holdings, Inc., Series A, Incremental Term Loan, 4.29% (LIBOR + 200 bps), 5/24/24 $ 2,739,494 1,510,338 Shearer's Foods LLC, First Lien Term Loan, 6.552% (LIBOR + 425 bps), 6/30/21 1,507,506 2,488,731 Utz Quality Foods LLC, First Lien Initial Term Loan, 5.802% (LIBOR + 350 bps), 11/21/24 2,501,175 --------------- $ 20,544,658 ------------------------------------------------------------------------------------------------------ Soft Drinks -- 0.1% 1,200,000 Refresco Group NV, Facility B 3, 5.564% (LIBOR + 325 bps), 3/28/25 $ 1,201,470 --------------- Total Food, Beverage & Tobacco $ 24,161,482 ------------------------------------------------------------------------------------------------------ HEALTH CARE EQUIPMENT & SERVICES -- 8.1% Health Care Distributors -- 0.1% 995,000 PharMerica Corp., First Lien Initial Term Loan, 5.78% (LIBOR + 350 bps), 12/6/24 $ 999,975 ------------------------------------------------------------------------------------------------------ Health Care Equipment -- 0.2% 591,000 Cidron Healthcare, Ltd. (aka ConvaTec, Inc.), Term B Loan, 4.636% (LIBOR + 225 bps), 10/25/23 $ 595,248 1,444,000(b) NMN Holdings III Corp., Closing Date Term Loan, 11/13/25 1,447,610 --------------- $ 2,042,858 ------------------------------------------------------------------------------------------------------ Health Care Facilities -- 2.6% 3,152,966 Acadia Healthcare Co., Inc., Tranche B-4 Term Loan, 4.802% (LIBOR + 250 bps), 2/16/23 $ 3,164,790 2,798,399 ATI Holdings Acquisition, Inc., First Lien Initial Term Loan, 5.78% (LIBOR + 350 bps), 5/10/23 2,804,228 1,840,000(b) Auris LuxCo (aka Sivantos Group), First Lien Term B Loan, 7/24/25 1,855,526 1,564,250 CHS/Community Health Systems, Inc., Incremental 2021 Term H Loan, 5.563% (LIBOR + 325 bps), 1/27/21 1,535,572 2,773,345 Concentra, Inc., First Lien Tranche B-1 Term Loan, 5.03% (LIBOR + 275 bps), 6/1/22 2,783,746 796,000 HCA, Inc., Tranche B-10 Term Loan, 4.302% (LIBOR + 200 bps), 3/13/25 800,699 1,750,000 Kindred Healthcare LLC, Closing Date Term Loan, 7.313% (LIBOR + 500 bps), 7/2/25 1,753,281 4,273,329 NVA Holdings, Inc., First Lien Term B3 Loan, 5.052% (LIBOR + 275 bps), 2/2/25 4,247,509 1,050,547 Quorum Health Corp., Term Loan, 9.052% (LIBOR + 675 bps), 4/29/22 1,063,460 2,696,344 Select Medical Corp., Tranche B Term Loan, 4.78% (LIBOR + 275 bps), 3/6/25 2,708,477 1,365,000(b) Universal Hospital Services, Inc., Term Loan B, 10/18/25 1,375,238 634,096 Vizient, Inc., Term B-4 Loan, 5.052% (LIBOR + 275 bps), 2/13/23 637,663 --------------- $ 24,730,189 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 28 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Health Care Services -- 3.1% 1,934,729 Alliance HealthCare Services, Inc., First Lien Initial Term Loan, 6.802% (LIBOR + 450 bps), 10/24/23 $ 1,948,030 500,000 Alliance HealthCare Services, Inc., Second Lien Initial Term Loan, 12.302% (LIBOR + 1,000 bps), 4/24/24 501,250 2,103,064 DaVita, Inc. (fka DaVita HealthCare Partners, Inc.), Tranche B Term Loan, 5.052% (LIBOR + 275 bps), 6/24/21 2,110,122 807,500 Diplomat Pharmacy, Inc., Initial Term B Loan, 6.81% (LIBOR + 450 bps), 12/20/24 811,537 1,500,000 Envision Healthcare Corp., Initial Term Loan, 6.052% (LIBOR + 375 bps), 10/10/25 1,471,979 2,355,869 ExamWorks Group, Inc. (fka Gold Merger Co., Inc.), Term B-1 Loan, 5.552% (LIBOR + 325 bps), 7/27/23 2,367,158 1,850,549 Gentiva Health Services, Inc., First Lien Closing Date Initial Term Loan, 6.063% (LIBOR + 375 bps), 7/2/25 1,857,443 2,498,979 GHX Ultimate Parent Corp., First Lien Initial Term Loan, 5.636% (LIBOR + 325 bps), 6/28/24 2,498,979 2,617,976 HC Group Holdings III, Inc., First Lien Refinancing Term Loan, 6.052% (LIBOR + 375 bps), 4/7/22 2,626,158 1,855,278 Jaguar Holding Co. I LLC (aka Pharmaceutical Product Development LLC), 2018 Term Loan, 4.802% (LIBOR + 250 bps), 8/18/22 1,851,944 872,671 MPH Acquisition Holdings LLC, Initial Term Loan, 5.136% (LIBOR + 275 bps), 6/7/23 871,921 2,535,525 National Mentor Holdings, Inc., Tranche B Term Loan, 5.386% (LIBOR + 300 bps), 1/31/21 2,535,525 1,664,691 nThrive, Inc. (fka Precyse Acquisition Corp.), Additional Term B-2 Loan, 6.802% (LIBOR + 450 bps), 10/20/22 1,675,095 500,000 Surgery Center Holdings, Inc., Initial Term Loan, 5.57% (LIBOR + 325 bps), 9/2/24 499,687 2,955,000 Team Health Holdings, Inc., Initial Term Loan, 5.052% (LIBOR + 275 bps), 2/6/24 2,803,556 2,869,852 US Renal Care, Inc., First Lien Initial Term Loan, 6.636% (LIBOR + 425 bps), 12/30/22 2,792,128 --------------- $ 29,222,512 ------------------------------------------------------------------------------------------------------ Health Care Supplies -- 0.7% 1,143,916 Greatbatch, Ltd., New Term B Loan, 5.28% (LIBOR + 300 bps), 10/27/22 $ 1,149,755 1,535,563 Kinetic Concepts, Inc., Dollar Term Loan, 5.636% (LIBOR + 325 bps), 2/2/24 1,543,081 4,030,817 Sterigenics-Nordion Holdings LLC, Incremental Term Loan, 5.302% (LIBOR + 300 bps), 5/15/22 4,038,375 --------------- $ 6,731,211 ------------------------------------------------------------------------------------------------------ Health Care Technology -- 1.2% 3,258,238 Change Healthcare Holdings, Inc. (fka Emdeon, Inc.), Closing Date Term Loan, 5.173% (LIBOR + 275 bps), 3/1/24 $ 3,258,463 The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 29 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Health Care Technology -- (continued) 1,496,250 Iqvia, Inc. (Quintiles IMS), Term B-3 Dollar Loan, 4.136% (LIBOR + 175 bps), 6/11/25 $ 1,494,006 3,152,124 Press Ganey Holdings, Inc., 2018 First Lien Replacement Term Loan, 5.052% (LIBOR + 275 bps), 10/23/23 3,159,348 314,783 Quintiles IMS, Inc., Term B-1 Dollar Loan, 4.386% (LIBOR + 200 bps), 3/7/24 315,718 1,995,000 Sound Inpatient Physicians, Inc., First Lien Initial Term Loan, 5.302% (LIBOR + 300 bps), 6/27/25 1,999,987 500,000 Sound Inpatient Physicians, Inc., Second Lien Initial Term Loan, 9.052% (LIBOR + 675 bps), 6/26/26 505,000 --------------- $ 10,732,522 ------------------------------------------------------------------------------------------------------ Managed Health Care -- 0.2% 1,960,150 Prospect Medical Holdings, Inc., Term B-1 Loan, 7.813% (LIBOR + 550 bps), 2/22/24 $ 1,971,176 --------------- Total Health Care Equipment & Services $ 76,430,443 ------------------------------------------------------------------------------------------------------ HOUSEHOLD & PERSONAL PRODUCTS -- 1.6% Household Products -- 1.0% 2,499,750 Alphabet Holding Co., Inc. (aka Nature's Bounty), First Lien Initial Term Loan, 5.802% (LIBOR + 350 bps), 9/26/24 $ 2,392,731 1,880,000(b) Energizer Holdings, Inc., Term B Loan, 6/20/25 1,890,951 483,750 Energizer Holdings, Inc., Term Loan, 4.313% (LIBOR + 200 bps), 6/30/22 484,802 1,000,000 Resideo Funding Inc., Tranche B Term Loan, 4.49% (LIBOR + 200 bps), 10/24/25 1,005,000 1,998,637 Spectrum Brands, Inc., 2017 Refinanced USD Term Loan, 4.354% (LIBOR + 200 bps), 6/23/22 2,003,218 2,271,250 WKI Holding Co., Inc., Initial Term Loan, 6.343% (LIBOR + 400 bps), 5/1/24 2,245,698 --------------- $ 10,022,400 ------------------------------------------------------------------------------------------------------ Personal Products -- 0.6% 2,475,063 Albea Beauty Holdings SA, Facility B2, 5.195% (LIBOR + 275 bps), 4/22/24 $ 2,470,422 1,521,188 Coty, Inc., USD Term Loan B, 4.531% (LIBOR + 225 bps), 4/7/25 1,493,140 299,262 Party City Holdings, Inc., 2018 Replacement Term Loan, 5.06% (LIBOR + 275 bps), 8/19/22 300,759 1,771,246 Revlon Consumer Products Corp., Initial Term B Loan, 5.813% (LIBOR + 350 bps), 9/7/23 1,300,537 --------------- $ 5,564,858 --------------- Total Household & Personal Products $ 15,587,258 ------------------------------------------------------------------------------------------------------ INSURANCE -- 1.1% Insurance Brokers -- 0.1% 500,000 NFP Corp., Term B Loan, 5.302% (LIBOR + 300 bps), 1/8/24 $ 499,125 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 30 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Life & Health Insurance -- 0.2% 2,055,197 Integro Parent, Inc., First Lien Initial Term Loan, 8.068% (LIBOR + 575 bps), 10/31/22 $ 2,060,335 ------------------------------------------------------------------------------------------------------ Property & Casualty Insurance -- 0.8% 2,031,672 Alliant Holdings Intermediate LLC, Initial Term Loan, 5.28% (LIBOR + 300 bps), 5/9/25 $ 2,032,148 1,221,891 AmWINS Group, Inc., First Lien Term Loan, 5.047% (LIBOR + 275 bps), 1/25/24 1,226,473 2,286,121 Confie Seguros Holding II Co., Term B Loan, 7.552% (LIBOR + 525 bps), 4/19/22 2,290,408 1,881,000 USI, Inc. (fka Compass Investors Inc.), 2017 New Term Loan, 5.386% (LIBOR + 300 bps), 5/16/24 1,872,535 --------------- $ 7,421,564 --------------- Total Insurance $ 9,981,024 ------------------------------------------------------------------------------------------------------ MATERIALS -- 9.4% Construction Materials -- 0.9% 1,500,000 84 Lumber Co., Term B-1 Loan, 7.531% (LIBOR + 525 bps), 10/25/23 $ 1,512,499 1,938,612 American Bath Group LLC, First Lien Replacement Term Loan, 6.636% (LIBOR + 425 bps), 9/30/23 1,950,728 493,036 Associated Asphalt Partners LLC, Tranche B Term Loan, 7.552% (LIBOR + 525 bps), 4/5/24 492,625 2,475,000 HD Supply Waterworks, Ltd., Initial Term Loan, 5.317% (LIBOR + 300 bps), 8/1/24 2,477,062 1,545,438 Penn Engineering & Manufacturing Corp., Tranche B Term Loan, 5.045% (LIBOR + 275 bps), 6/27/24 1,550,267 --------------- $ 7,983,181 ------------------------------------------------------------------------------------------------------ Diversified Chemicals -- 2.0% 496,250 Avantor, Inc., Initial Dollar Term Loan, 6.302% (LIBOR + 400 bps), 11/21/24 $ 500,205 1,703,408 Azelis Finance SA (Azelis US Holding, Inc.), 2017 Refinancing Dollar Term Loan, 5.976% (LIBOR + 375 bps), 12/16/22 1,716,184 3,977,671 Chemours Co., Tranche B-2 US Dollar Term Loan, 4.05% (LIBOR + 175 bps), 4/3/25 3,960,269 992,500 Ineos US Finance LLC, New 2024 Dollar Term Loan, 4.302% (LIBOR + 200 bps), 4/1/24 993,120 1,012,500(b) Natgasoline LLC, Term Loan B, 10/31/25 1,016,297 1,016,772 Orion Engineered Carbons GmbH, Initial Dollar Term Loan, 4.386% (LIBOR + 200 bps), 7/25/24 1,017,412 3,088,827 Plaskolite LLC, First Lien Term Loan, 5.802% (LIBOR + 350 bps), 11/3/22 3,092,688 2,586,312 Tata Chemicals North America, Term Loan, 5.188% (LIBOR + 275 bps), 8/7/20 2,579,846 750,145 Tronox, Ltd., First Lien Blocked Dollar Term Loan, 5.302% (LIBOR + 300 bps), 9/23/24 749,676 The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 31 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Diversified Chemicals -- (continued) 1,731,105 Tronox, Ltd., First Lien Initial Dollar Term Loan, 5.302% (LIBOR + 300 bps), 9/23/24 $ 1,730,023 1,527,228 Univar USA, Inc., Term B-3 Loan, 4.552% (LIBOR + 225 bps), 7/1/24 1,528,341 --------------- $ 18,884,061 ------------------------------------------------------------------------------------------------------ Diversified Metals & Mining -- 0.9% 997,500 Aleris International, Inc., Initial Term Loan, 7.052% (LIBOR + 475 bps), 2/27/23 $ 1,008,306 1,206,975 Ball Metalpack Finco LLC, First Lien Initial Term Loan, 6.802% (LIBOR + 450 bps), 7/31/25 1,220,553 3,994,938 Global Brass and Copper, Inc., Initial Term Loan, 4.813% (LIBOR + 250 bps), 5/29/25 4,004,925 1,443,750 Oxbow Calcining LLC, First Lien Tranche B Term Loan, 5.802% (LIBOR + 350 bps), 1/4/23 1,449,164 773,115 Phoenix Services International LLC, Term Loan B, 6.031% (LIBOR + 375 bps), 3/1/25 780,363 434,049 US Silica Co., Term Loan, 6.313% (LIBOR + 400 bps), 5/1/25 395,745 --------------- $ 8,859,056 ------------------------------------------------------------------------------------------------------ Metal & Glass Containers -- 0.8% 1,764,203 BWay Holding Co., Initial Term Loan, 5.658% (LIBOR + 325 bps), 4/3/24 $ 1,756,485 1,895,886 Consolidated Container Co., LLC, First Lien Initial Term Loan, 5.052% (LIBOR + 275 bps), 5/22/24 1,900,389 703,114 Crown Holdings, Inc., Dollar Term B Loan, 4.283% (LIBOR + 200 bps), 4/3/25 705,531 1,547,225 IBC Capital I, Ltd. (aka Goodpack, Ltd.), First Lien Tranche B-1 Term Loan, 6.087% (LIBOR + 375 bps), 9/11/23 1,547,225 1,935,375 Trident TPI Holdings, Inc., Tranche B-1 Term Loan, 5.552% (LIBOR + 325 bps), 10/17/24 1,923,279 --------------- $ 7,832,909 ------------------------------------------------------------------------------------------------------ Paper Packaging -- 0.7% 1,746,797 Berry Global, Inc. (fka Berry Plastics Corp.), Term Q Loan, 4.277% (LIBOR + 200 bps), 10/1/22 $ 1,748,161 492,500 Berry Global, Inc. (fka Berry Plastics Corp.), Term R Loan, 4.277% (LIBOR + 200 bps), 1/19/24 492,346 1,510,351 Caraustar Industries, Inc., Refinancing Term Loan, 7.886% (LIBOR + 550 bps), 3/14/22 1,519,036 3,135,000 Plastipak Holdings, Inc., Tranche B Term Loan, 4.81% (LIBOR + 250 bps), 10/14/24 3,132,257 --------------- $ 6,891,800 ------------------------------------------------------------------------------------------------------ Paper Products -- 0.2% 1,633,752 Ranpak Corp., Tranche B-1 USD Term Loan, 5.552% (LIBOR + 325 bps), 10/1/21 $ 1,633,752 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 32 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Specialty Chemicals -- 2.8% 2,381,477 Allnex (Luxembourg) & Cy SCA (fka AI Chem & Cy SCA), Tranche B-2 Term Loan, 5.567% (LIBOR + 325 bps), 9/13/23 $ 2,384,454 1,794,256 Allnex (Luxembourg) & Cy SCA (fka AI Chem & Cy SCA), Tranche B-3 Term Loan, 5.567% (LIBOR + 325 bps), 9/13/23 1,796,499 1,802,188 Ashland LLC, Term B Loan, 4.037% (LIBOR + 175 bps), 5/17/24 1,808,757 2,395,921 Axalta Coating Systems Dutch Holding B BV (Axalta Coating Systems US Holdings, Inc.), Term B-3 Dollar Loan, 4.136% (LIBOR + 175 bps), 6/1/24 2,393,091 164,238 Ferro Corporation, Tranche B-1 Term Loan, 4.636% (LIBOR + 225 bps), 2/14/24 164,444 402,280 Ferro Corporation, Tranche B-2 Term Loan, 4.636% (LIBOR + 225 bps), 2/14/24 402,782 393,720 Ferro Corporation, Tranche B-3 Term Loan, 4.636% (LIBOR + 225 bps), 2/14/24 394,213 338,483 H.B. Fuller Co., Commitment, 4.28% (LIBOR + 200 bps), 10/20/24 337,706 3,145,559 MacDermid, Inc. (Platform Specialty Products Corp.), Tranche B-6 Term Loan, 5.302% (LIBOR + 300 bps), 6/7/23 3,145,559 2,560,235 Omnova Solutions, Inc., Term B-2 Loan, 5.552% (LIBOR + 325 bps), 8/25/23 2,566,636 4,115,864 Polyone Corp., Term B-4 Loan, 4.03% (LIBOR + 175 bps), 11/11/22 4,118,436 2,076,914 PQ Corp., Third Amendment Tranche B-1 Term Loan, 5.027% (LIBOR + 250 bps), 2/8/25 2,077,780 1,175,000 Starfruit Finco BV, Initial Dollar Term Loan, 5.506% (LIBOR + 325 bps), 10/1/25 1,174,449 2,790,240 Versum Materials, Inc. (fka Versum Materials LLC), Term Loan, 4.386% (LIBOR + 200 bps), 9/29/23 2,798,379 313,650 W.R. Grace & Co-CONN, Term B-1 Loan, 4.136% (LIBOR + 175 bps), 4/3/25 314,663 537,686 W.R. Grace & Co-CONN, Term B-2 Loan, 4.136% (LIBOR + 175 bps), 4/3/25 539,422 --------------- $ 26,417,270 ------------------------------------------------------------------------------------------------------ Steel -- 1.1% 2,231,651 American Builders & Contractors Supply Co., Inc., Term B-2 Loan, 4.302% (LIBOR + 200 bps), 10/31/23 $ 2,214,117 1,786,975 Big River Steel LLC, Closing Date Term Loan, 7.386% (LIBOR + 500 bps), 8/23/23 1,811,546 1,977,259 TMS International Corp. (aka Tube City IMS Corp.), Term B-2 Loan, 5.187% (LIBOR + 275 bps), 8/14/24 1,977,259 4,163,509 Zekelman Industries, Inc. (fka JMC Steel Group, Inc.), Term Loan, 4.623% (LIBOR + 225 bps), 6/14/21 4,162,218 --------------- $ 10,165,140 --------------- Total Materials $ 88,667,169 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 33 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ MEDIA & ENTERTAINMENT -- 7.9% Advertising -- 0.7% 2,431,074 CB Poly Investments LLC, First Lien Closing Date Term Loan, 6.052% (LIBOR + 375 bps), 8/16/23 $ 2,443,229 995,000 Lamar Media Corp., Term B Loan, 4.063% (LIBOR + 175 bps), 3/14/25 998,316 1,865,702 Outfront Media Capital LLC (Outfront Media Capital Corp.), Term Loan, 4.256% (LIBOR + 200 bps), 3/18/24 1,872,233 1,635,000 Red Ventures LLC, First Lien Term Loan, 6.302% (LIBOR + 400 bps), 11/8/24 1,641,813 --------------- $ 6,955,591 ------------------------------------------------------------------------------------------------------ Broadcasting -- 3.9% 1,024,278 A-L Parent LLC (aka Learfield Communications), First Lien Initial Term Loan, 5.56% (LIBOR + 325 bps), 12/1/23 $ 1,028,119 395,640(b) A-L Parent LLC (aka Learfield Communications), Incremental Term Loan, 12/1/23 399,349 2,419,031 CBS Radio, Inc., Additional Term B-1 Loan, 5.037% (LIBOR + 275 bps), 11/18/24 2,410,715 348,250 CSC Holdings LLC (fka CSC Holdings, Inc. (Cablevision)), January 2018 Incremental Term Loan, 4.78% (LIBOR + 250 bps), 1/25/26 349,382 3,767,937 CSC Holdings LLC (fka CSC Holdings, Inc. (Cablevision)), March 2017 Refinancing Term Loan, 4.53% (LIBOR + 225 bps), 7/17/25 3,753,762 2,628,905(b) CSC Holdings, LLC (fka CSC Holdings Inc. (Cablevision)), October 2018 Incremental Term Loan, 1/15/26 2,625,619 990,000 E.W. Scripps Co., Tranche B Term Loan, 4.302% (LIBOR + 200 bps), 10/2/24 990,206 3,081,456 Gray Television, Inc., Term B-2 Loan, 4.515% (LIBOR + 225 bps), 2/7/24 3,086,593 1,759,887 Hubbard Radio LLC, Term Loan, 5.31% (LIBOR + 300 bps), 3/28/25 1,762,087 943,625 MCC Iowa LLC, Tranche M Term Loan, 4.22% (LIBOR + 200 bps), 1/15/25 944,805 1,085,576 MediArena Acquisition BV (fka AP NMT Acquisition BV), First Lien Dollar Term B Loan, 8.148% (LIBOR + 575 bps), 8/13/21 1,087,611 2,513,553 Nielsen Finance LLC (VNU, Inc.), Class B-4 Term Loan, 4.281% (LIBOR + 200 bps), 10/4/23 2,504,127 3,406,912 Quebecor Media, Inc., Facility B-1 Tranche, 4.564% (LIBOR + 225 bps), 8/17/20 3,416,138 1,559,250 Raycom TV Broadcasting LLC, Tranche B-1 Term Loan, 4.552% (LIBOR + 225 bps), 8/23/24 1,562,173 4,683,647 Sinclair Television Group, Inc., Tranche B Term Loan, 4.56% (LIBOR + 225 bps), 1/3/24 4,686,574 1,992,898 Townsquare Media, Inc., Additional Term B Loan, 5.294% (LIBOR + 300 bps), 4/1/22 1,995,389 The accompanying notes are an integral part of these financial statements. 34 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Broadcasting -- (continued) 171,023 Tribune Media Co., Term B Loan, 5.302% (LIBOR + 300 bps), 12/27/20 $ 171,610 2,131,585 Tribune Media Co., Term C Loan, 5.302% (LIBOR + 300 bps), 1/26/24 2,138,898 1,683,707 Univision Communications, Inc., 2017 Replacement Repriced First Lien Term Loan, 5.052% (LIBOR + 275 bps), 3/15/24 1,618,113 --------------- $ 36,531,270 ------------------------------------------------------------------------------------------------------ Cable & Satellite -- 1.6% 1,382,500 Cable One, Inc., Incremental Term B-1 Loan, 4.14% (LIBOR + 175 bps), 5/1/24 $ 1,388,261 7,398,506 Charter Communications Operating LLC (aka CCO Safari LLC), Term B Loan, 4.31% (LIBOR + 200 bps), 3/31/23 7,407,754 450,000 Unitymedia Finance LLC, Facility E Term Loan, 4.28% (LIBOR + 200 bps), 6/1/23 449,919 1,200,000 Unitymedia Hessen GmbH & Co. KG, Facility B, 4.53% (LIBOR + 225 bps), 9/30/25 1,199,906 1,803,253 UPC Financing Partnership , Facility AR, 4.78% (LIBOR + 250 bps), 1/15/26 1,798,464 2,600,000 Ziggo Secured Finance Partnership, Term Loan E Facility, 4.78% (LIBOR + 250 bps), 4/15/25 2,553,018 --------------- $ 14,797,322 ------------------------------------------------------------------------------------------------------ Movies & Entertainment -- 1.0% 835,125 AMC Entertainment Holdings, Inc., 2016 Incremental Term Loan, 4.53% (LIBOR + 225 bps), 12/15/23 $ 836,482 2,066,774 AMC Entertainment, Inc., Initial Term Loan, 4.53% (LIBOR + 225 bps), 12/15/22 2,070,133 378,188 Kasima LLC, Term Loan, 4.852% (LIBOR + 250 bps), 5/17/21 380,237 1,489,714 Live Nation Entertainment, Inc., Term B-3 Loan, 4.063% (LIBOR + 175 bps), 10/31/23 1,493,671 1,000,000 NAI Entertainment Holdings LLC, Tranche B Term Loan, 4.81% (LIBOR + 250 bps), 5/8/25 1,000,625 1,215,288 Rovi Solutions Corp./Rovi Guides, Inc., Term B Loan, 4.81% (LIBOR + 250 bps), 7/2/21 1,214,148 1,895,000 Seminole Hard Rock Entertainment, Inc., Term Loan, 5.146% (LIBOR + 275 bps), 5/14/20 1,901,712 --------------- $ 8,897,008 ------------------------------------------------------------------------------------------------------ Publishing -- 0.7% 1,711,617 DH Publishing LP, Term B-6 Loan, 4.53% (LIBOR + 225 bps), 3/24/24 $ 1,713,757 1,552,247 Quincy Newspapers, Inc., Term Loan B, 5.311% (LIBOR + 300bps/PRIME + 200 bps), 11/2/22 1,558,068 3,149,888 Trader Corp., First Lien 2017 Refinancing Term Loan, 5.295% (LIBOR + 300 bps), 9/28/23 3,149,888 --------------- $ 6,421,713 --------------- Total Media & Entertainment $ 73,602,904 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 35 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 2.7% Biotechnology -- 0.5% 3,372,741 Alkermes, Inc., 2023 Term Loan, 4.54% (LIBOR + 225 bps), 3/27/23 $ 3,387,497 837,250 Lantheus Medical Imaging, Inc., Replacement Term Loan, 6.052% (LIBOR + 375 bps), 6/30/22 837,250 --------------- $ 4,224,747 ------------------------------------------------------------------------------------------------------ Life Sciences Tools & Services -- 0.3% 1,298,820 Catalent Pharma Solutions, Inc. (fka Cardinal Health 409, Inc.), Dollar Term Loan, 4.552% (LIBOR + 225 bps), 5/20/24 $ 1,306,010 987,374 Explorer Holdings, Inc., Initial Term Loan, 6.136% (LIBOR + 375 bps), 5/2/23 996,013 781,875 Syneos Health, Inc. (fka INC Research Holdings, Inc.), Replacement Term B Loan, 4.302% (LIBOR + 200 bps), 8/1/24 781,666 --------------- $ 3,083,689 ------------------------------------------------------------------------------------------------------ Pharmaceuticals -- 1.9% 1,353,391 Akorn, Inc., Term Loan, 7.813% (LIBOR + 550 bps), 4/16/21 $ 1,256,116 5,447,140 Bausch Health Cos., Inc. (fka Valeant Pharmaceuticals International, Inc.), Initial Term Loan, 5.274% (LIBOR + 300 bps), 6/2/25 5,460,382 4,280,912 Endo Luxembourg Finance Co. I S.a r.l., Initial Term Loan, 6.563% (LIBOR + 425 bps), 4/29/24 4,300,497 1,182,000 Grifols Worldwide Operations, Ltd., Tranche B Term Loan, 4.467% (LIBOR + 225 bps), 1/31/25 1,184,290 2,917,376 Horizon Pharma, Inc., Fourth Amendment Refinanced Term Loan, 5.313% (LIBOR + 300 bps), 3/29/24 2,924,670 2,653,082 RPI Finance Trust, Initial Term Loan B-6, 4.386% (LIBOR + 200 bps), 3/27/23 2,658,678 --------------- $ 17,784,633 --------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 25,093,069 ------------------------------------------------------------------------------------------------------ REAL ESTATE -- 1.2% Diversified REIT -- 0.1% 747,473 ESH Hospitality, Inc., Third Repriced Term Loan, 4.302% (LIBOR + 200 bps), 8/30/23 $ 747,998 ------------------------------------------------------------------------------------------------------ Hotel & Resort REIT -- 0.3% 2,666,625 MGM Growth Properties Operating Partnership LP, Term B Loan, 4.302% (LIBOR + 200 bps), 3/21/25 $ 2,661,625 ------------------------------------------------------------------------------------------------------ Real Estate Development -- 0.0%+ 450,000 Hanjin International Corp. (aka Wilshire Grand Center), Initial Term Loan, 4.945% (LIBOR + 250 bps), 10/19/20 $ 450,000 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 36 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Retail REITs -- 0.3% 2,390,000 DTZ US Borrower LLC, Closing Date Term Loan, 5.552% (LIBOR + 325 bps), 8/21/25 $ 2,392,765 ------------------------------------------------------------------------------------------------------ Specialized REIT -- 0.5% 3,219,363 Communications Sales & Leasing, Inc. (CSL Capital LLC), Shortfall Term Loan, 5.302% (LIBOR + 300 bps), 10/24/22 $ 3,050,346 2,089,500 Iron Mountain, Inc., Incremental Term Loan B, 4.052% (LIBOR + 175 bps), 1/2/26 2,065,122 --------------- $ 5,115,468 --------------- Total Real Estate $ 11,367,856 ------------------------------------------------------------------------------------------------------ RETAILING -- 2.6% Apparel Retail -- 0.2% 656,682 Hudson's Bay Co., Initial Term Loan, 5.545% (LIBOR + 325 bps), 9/30/22 $ 646,011 1,134,964 Men's Wearhouse, Inc., Tranche B-2 Term Loan, 5.506% (LIBOR + 325 bps), 4/9/25 1,141,112 --------------- $ 1,787,123 ------------------------------------------------------------------------------------------------------ Automotive Retail -- 0.3% 791,362 Avis Budget Car Rental LLC, Tranche B Term Loan, 4.31% (LIBOR + 200 bps), 2/13/25 $ 789,868 2,524,494 CWGS Group LLC, Term Loan, 5.029% (LIBOR + 275 bps), 11/8/23 2,440,345 --------------- $ 3,230,213 ------------------------------------------------------------------------------------------------------ Department Stores -- 0.6% 891,000 Archroma Finance S.a r.l., Facility B2, 6.67% (LIBOR + 425 bps), 8/12/24 $ 893,228 1,600,000 Dynatrace LLC, First Lien Term Loan, 5.552% (LIBOR + 325 bps), 8/22/25 1,608,750 480,892 JC Penney Corp., Inc., Term Loan, 6.567% (LIBOR + 425 bps), 6/23/23 433,203 2,612,584 Neiman Marcus Group, Ltd., LLC, Other Term Loan, 5.531% (LIBOR + 325 bps), 10/25/20 2,383,440 --------------- $ 5,318,621 ------------------------------------------------------------------------------------------------------ Homefurnishing Retail -- 0.2% 2,566,201 Serta Simmons Bedding LLC, First Lien Initial Term Loan, 5.775% (LIBOR + 350 bps), 11/8/23 $ 2,333,318 ------------------------------------------------------------------------------------------------------ Internet & Direct Marketing Retail -- 0.3% 990,025 NAB Holdings, LLC, 2018 Refinancing Term Loan, 5.386% (LIBOR + 300 bps), 7/1/24 $ 980,125 548,625 Shutterfly, Inc., Incremental Term Loan, 5.06% (LIBOR + 275 bps), 8/17/24 549,882 1,240,648 Shutterfly, Inc., Initial Term B Loan, 4.78% (LIBOR + 250 bps), 8/19/24 1,244,784 --------------- $ 2,774,791 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 37 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Specialty Stores -- 1.0% 1,732,500 Bass Pro Group LLC, Initial Term Loan, 7.302% (LIBOR + 500 bps), 9/25/24 $ 1,735,206 1,672,789 Michaels Stores, Inc., 2018 New Replacement Term B Loan, 4.794% (LIBOR + 250 bps), 1/30/23 1,664,007 4,326,238 PetSmart, Inc., Tranche B-2 Term Loan, 5.28% (LIBOR + 300 bps), 3/11/22 3,680,006 2,481,250 Staples, Inc., Closing Date Term Loan, 6.343% (LIBOR + 400 bps), 9/12/24 2,476,598 --------------- $ 9,555,817 --------------- Total Retailing $ 24,999,883 ------------------------------------------------------------------------------------------------------ SEMICONDUCTORS & SEMICONDUCTOR EQUIPMENT -- 1.6% Semiconductor Equipment -- 0.5% 1,000,000 Cohu, Inc., Term Loan B, 5.396% (LIBOR + 300 bps), 9/19/25 $ 1,001,875 884,526 Entegris, Inc., New Tranche B Term Loan, 4.552% (LIBOR + 225 bps), 4/30/21 887,843 818,323 MKS Instruments, Inc., Tranche B-3 Term Loan, 4.052% (LIBOR + 175 bps), 5/1/23 821,137 445,263 Sensata Technologies BV, Sixth Amendment Term Loan, 4.03% (LIBOR + 175 bps), 10/14/21 447,490 1,925,000 Ultra Clean Holdings, Inc., Term Loan B, 6.802% (LIBOR + 450 bps), 8/27/25 1,893,719 --------------- $ 5,052,064 ------------------------------------------------------------------------------------------------------ Semiconductors -- 1.1% 987,538 Bright Bidco BV (aka Lumileds LLC), 2018 Refinancing Term B Loan, 5.859% (LIBOR + 350 bps), 6/30/24 $ 969,638 2,197,580 MACOM Technology Solutions Holdings, Inc. (fka M/A-COM Technology Solutions Holdings, Inc.), Initial Term Loan, 4.552% (LIBOR + 225 bps), 5/17/24 2,131,652 2,215,617 Microchip Technology, Inc., Initial Term Loan, 4.31% (LIBOR + 200 bps), 5/29/25 2,209,524 3,486,285 Micron Technology, Inc., Term Loan, 4.06% (LIBOR + 175 bps), 4/26/22 3,495,001 1,237,540 ON Semiconductor Corp., 2018 New Replacement Term B-3 Loan, 4.052% (LIBOR + 175 bps), 3/31/23 1,237,076 --------------- $ 10,042,891 --------------- Total Semiconductors & Semiconductor Equipment $ 15,094,955 ------------------------------------------------------------------------------------------------------ SOFTWARE & SERVICES -- 5.6% Application Software -- 0.7% 2,981,222 Applied Systems, Inc., First Lien Initial Term Loan, 5.386% (LIBOR + 300 bps), 9/19/24 $ 2,991,572 1,604,582 Infor (US), Inc. (fka Lawson Software, Inc.), Tranche B-6 Term Loan, 5.136% (LIBOR + 275 bps), 2/1/22 1,601,072 1,613,614 Verint System, Inc., Refinancing Term Loan, 4.274% (LIBOR + 200 bps), 6/28/24 1,618,656 --------------- $ 6,211,300 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 38 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Data Processing & Outsourced Services -- 1.3% 982,500 Conduent, Inc., Term B Loan, 4.802% (LIBOR + 250 bps), 12/7/23 $ 986,798 3,185,413 Everi Payments Inc., Term B Loan, 5.302% (LIBOR + 300 bps), 5/9/24 3,205,985 2,542,227 First Data Corp., 2022D New Dollar Term Loan, 4.287% (LIBOR + 200 bps), 7/8/22 2,539,453 2,841,078 First Data Corp., 2024A New Dollar Term Loan, 4.287% (LIBOR + 200 bps), 4/26/24 2,837,978 765,206 Global Payments Inc., Term B-3 Loan, 4.052% (LIBOR + 175 bps), 4/21/23 766,401 1,000,000 Global Payments Inc., Term B-4 Loan, 4.086% (LIBOR + 175 bps), 10/17/25 1,000,000 1,398,497 WEX, Inc., Term B-2 Loan, 4.552% (LIBOR + 225 bps), 6/30/23 1,402,868 --------------- $ 12,739,483 ------------------------------------------------------------------------------------------------------ Internet Services & Infrastructure -- 0.6% 1,427,973 Rackspace Hosting, Inc., First Lien Term B Loan, 5.348% (LIBOR + 300 bps), 11/3/23 $ 1,391,560 591,266 Vantiv LLC (fka Fifth Third Processing Solutions LLC), New Term B-3 Loan, 4.03% (LIBOR + 175 bps), 10/14/23 590,978 991,020 Vantiv LLC (fka Fifth Third Processing Solutions LLC), New Term B-4 Loan, 4.03% (LIBOR + 175 bps), 8/9/24 990,676 2,295,129 Zayo Group LLC (Zayo Capital, Inc.), 2017 Incremental Refinancing B-2 Term Loan, 4.552% (LIBOR + 225 bps), 1/19/24 2,301,225 --------------- $ 5,274,439 ------------------------------------------------------------------------------------------------------ Internet Software & Services -- 0.2% 1,488,061 Match Group, Inc. (fka The Match Group, Inc.), Additional Term B-1 Loan, 4.78% (LIBOR + 250 bps), 11/16/22 $ 1,499,221 ------------------------------------------------------------------------------------------------------ IT Consulting & Other Services -- 2.3% 322,628 4L Technologies, Inc. (fka Clover Holdings, Inc.), Term Loan, 6.795% (LIBOR + 450 bps), 5/8/20 $ 315,773 945,250 Altran Technologies, Facility B, 4.588% (LIBOR + 225 bps), 3/20/25 948,204 655,129 Booz Allen Hamilton, Inc., New Refinancing Tranche B Term Loan, 4.302% (LIBOR + 200 bps), 6/30/23 658,241 3,730,539 CDW LLC (aka AP Exhaust Acquisition LLC) (fka CDW Corp.), Term Loan, 4.06% (LIBOR + 175 bps), 8/17/23 3,740,500 2,825,000 Financial & Risk US Holdings, Inc., Initial Dollar Term Loan, 6.052% (LIBOR + 375 bps), 10/1/25 2,803,813 995,000 Flexera Software LLC (fka Flexera Software, Inc.), First Lien Initial Term Loan, 5.56% (LIBOR + 325 bps), 2/26/25 998,524 1,972,853 Go Daddy Operating Co., LLC (GD Finance Co., Inc.), Tranche B-1 Term Loan, 4.552% (LIBOR + 225 bps), 2/15/24 1,977,323 763,428 Kronos, Inc., First Lien Incremental Term Loan, 5.343% (LIBOR + 300 bps), 11/1/23 765,535 1,000,000(b) Mitchell International, Inc., First Lien Initial Term Loan, 11/29/24 997,265 The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 39 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ IT Consulting & Other Services -- (continued) 2,550,651 Rocket Software, Inc., First Lien Term Loan, 6.136% (LIBOR + 375 bps), 10/14/23 $ 2,560,535 1,000,000(b) Science Applications International Corp., Term Loan B, 11/5/25 1,001,406 2,543,431 Tempo Acquisition LLC, Initial Term Loan, 5.302% (LIBOR + 300 bps), 5/1/24 2,547,007 2,600,000 Verscend Holding Corp., Term B Loan, 6.802% (LIBOR + 450 bps), 8/27/25 2,621,125 --------------- $ 21,935,251 ------------------------------------------------------------------------------------------------------ Systems Software -- 0.5% 616,139 Ivanti Software, Inc. (fka LANDesk Group, Inc.), First Lien Term Loan, 6.51% (LIBOR + 425 bps), 1/20/24 $ 617,679 967,575 West Corp., Incremental Term B-1 Loan, 6.026% (LIBOR + 350 bps), 10/10/24 958,201 3,492,281 West Corp., Initial Term B Loan, 6.526% (LIBOR + 400 bps), 10/10/24 3,483,114 --------------- $ 5,058,994 --------------- Total Software & Services $ 52,718,688 ------------------------------------------------------------------------------------------------------ TECHNOLOGY HARDWARE & EQUIPMENT -- 1.9% Communications Equipment -- 0.7% 2,300,000 Ciena Corp., Refinancing Term Loan, 4.28% (LIBOR + 200 bps), 9/26/25 $ 2,306,468 579,708 Commscope, Inc., Tranche 5 Term Loan, 4.302% (LIBOR + 200 bps), 12/29/22 581,881 1,000,000(b) Lumentum Holdings Inc., Term Loan, 8/8/25 1,005,000 2,250,000 Plantronics, Inc., Initial Term B Loan, 4.802% (LIBOR + 250 bps), 7/2/25 2,247,539 --------------- $ 6,140,888 ------------------------------------------------------------------------------------------------------ Electronic Components -- 0.2% 2,245,898 Mirion Technologies (Finance) LLC (Mirion Technologies, Inc.), First Lien Initial Term Loan, 7.136% (LIBOR + 475 bps), 3/31/22 $ 2,240,283 ------------------------------------------------------------------------------------------------------ Electronic Equipment & Instruments -- 0.1% 969,649 Zebra Technologies Corp. (Zebra Diamond Holdings, Ltd.), Tranche B Term Loan, 4.063% (LIBOR + 175 bps), 10/27/21 $ 974,618 ------------------------------------------------------------------------------------------------------ Electronic Manufacturing Services -- 0.2% 997,500 Celestica, Inc., Term B Loan, 4.295% (LIBOR + 200 bps), 6/27/25 $ 991,889 1,187,074 TTM Technologies, Inc., Term Loan B, 4.756% (LIBOR + 250 bps), 9/28/24 1,187,816 --------------- $ 2,179,705 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 40 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Technology Distributors -- 0.3% 582,112 SS&C Technologies Holdings, Inc., 2017 Refinancing New Term B-1 Loan, 4.552% (LIBOR + 225 bps), 7/8/22 $ 583,308 735,541 SS&C Technologies Holdings, Inc., Term B-3 Loan, 4.552% (LIBOR + 225 bps), 4/16/25 732,840 285,096 SS&C Technologies Holdings, Inc., Term B-4 Loan, 4.552% (LIBOR + 225 bps), 4/16/25 284,049 1,000,000 SS&C Technologies Holdings, Inc., Term B-5 Loan, 4.552% (LIBOR + 225 bps), 4/16/25 997,875 --------------- $ 2,598,072 ------------------------------------------------------------------------------------------------------ Technology Hardware, Storage & Peripherals -- 0.4% 3,851,989 Western Digital Corp., US Term B-4 Loan, 4.044% (LIBOR + 175 bps), 4/29/23 $ 3,834,656 --------------- Total Technology Hardware & Equipment $ 17,968,222 ------------------------------------------------------------------------------------------------------ TELECOMMUNICATION SERVICES -- 3.4% Integrated Telecommunication Services -- 2.2% 1,319,000 Altice France SA, USD Incremental Term B13 Loan, 6.28% (LIBOR + 400 bps), 8/14/26 $ 1,303,172 5,869,689 CenturyLink, Inc., Initial Term B Loan, 5.052% (LIBOR + 275 bps), 1/31/25 5,809,524 3,157,537 Frontier Communications Corp., Term B-1 Loan, 6.06% (LIBOR + 375 bps), 6/15/24 3,062,811 586,789 General Communications, Inc., New Term B Loan, 4.552% (LIBOR + 225 bps), 2/2/22 587,706 3,667,027 Level 3 Financing, Inc., Tranche B 2024 Term Loan, 4.53% (LIBOR + 225 bps), 2/22/24 3,673,903 1,526,750 Numericable US LLC, USD TLB-11 Term Loan, 5.052% (LIBOR + 275 bps), 7/31/25 1,486,673 496,250 Securus Technologies Holdings, Inc., First Lien Initial Term Loan, 6.802% (LIBOR + 450 bps), 11/1/24 498,855 1,980,000 SFR Group SA, USD Term Loan B-12, 5.967% (LIBOR + 369 bps), 1/31/26 1,944,113 1,305,384 Windstream Services LLC (fka Windstream Corp.), Tranche B-6 Term Loan, 6.29% (LIBOR + 400 bps), 3/29/21 1,222,982 950,780 Windstream Services LLC (fka Windstream Corp.), Tranche B-7 Term Loan, 5.54% (LIBOR + 325 bps), 2/17/24 828,763 --------------- $ 20,418,502 ------------------------------------------------------------------------------------------------------ Wireless Telecommunication Services -- 1.2% 1,980,000 Altice Financing SA, October 2017 USD Term Loan, 5.04% (LIBOR + 275 bps), 1/31/26 $ 1,949,047 2,338,167 Altice US Finance I Corp., March 2017 Refinancing Term Loan, 4.552% (LIBOR + 225 bps), 7/28/25 2,336,219 1,472,037 SBA Senior Finance II LLC, Initial Term Loan, 4.31% (LIBOR + 200 bps), 4/11/25 1,470,810 4,926,269 Sprint Communications, Inc., Initial Term Loan, 4.813% (LIBOR + 250 bps), 2/2/24 4,923,150 The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 41 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Wireless Telecommunication Services -- (continued) 1,045,876 Virgin Media Bristol LLC, Facility K, 4.78% (LIBOR + 250 bps), 1/15/26 $ 1,046,437 --------------- $ 11,725,663 --------------- Total Telecommunication Services $ 32,144,165 ------------------------------------------------------------------------------------------------------ TRANSPORTATION -- 1.7% Air Freight & Logistics -- 0.2% 1,619,250 Syncreon Global Finance, Inc., Term Loan, 6.777% (LIBOR + 425 bps), 10/28/20 $ 1,500,506 ------------------------------------------------------------------------------------------------------ Airlines -- 1.1% 3,935,250 Air Canada, Replacement Term Loan, 4.295% (LIBOR + 200 bps), 10/6/23 $ 3,948,366 871,987 American Airlines, Inc., 2017 Class B Term Loan, 4.28% (LIBOR + 200 bps), 12/14/23 867,286 490,000 American Airlines, Inc., 2017 Class B Term Loan, 4.295% (LIBOR + 200 bps), 4/28/23 487,397 3,879,991 American Airlines, Inc., 2018 Replacement Term Loan, 4.045% (LIBOR + 175 bps), 6/27/25 3,806,333 1,659,109 United AirLines, Inc., Refinanced Term Loan, 4.052% (LIBOR + 175 bps), 4/1/24 1,673,627 --------------- $ 10,783,009 ------------------------------------------------------------------------------------------------------ Highways & Railtracks -- 0.0%+ 500,000 Deck Chassis Acquisition Inc., Second Lien Initial Term Loan, 8.527% (LIBOR + 600 bps), 6/15/23 $ 504,375 ------------------------------------------------------------------------------------------------------ Marine -- 0.2% 810,643 Commercial Barge Line Co., Initial Term Loan, 11.052% (LIBOR + 875 bps), 11/12/20 $ 626,222 936,710 Navios Maritime Partners LP, Initial Term Loan, 7.34% (LIBOR + 500 bps), 9/14/20 938,271 --------------- $ 1,564,493 ------------------------------------------------------------------------------------------------------ Trucking -- 0.2% 108,236 Kenan Advantage Group Holdings Corp., Initial Canadian Term Loan, 5.302% (LIBOR + 300 bps), 7/29/22 $ 108,259 355,924 Kenan Advantage Group Holdings Corp., Initial US Term Loan, 5.302% (LIBOR + 300 bps), 7/29/22 355,998 969,537 YRC Worldwide, Inc., Tranche B-1 Term Loan, 10.802% (LIBOR + 850 bps), 7/26/22 982,868 --------------- $ 1,447,125 --------------- Total Transportation $ 15,799,508 ------------------------------------------------------------------------------------------------------ UTILITIES -- 2.6% Electric Utilities -- 1.4% 2,206,024 APLP Holdings, Ltd., Partnership, Term Loan, 5.302% (LIBOR + 300 bps), 4/13/23 $ 2,213,194 1,736,875 Calpine Construction Finance Co., LP, Term B Loan, 4.802% (LIBOR + 250 bps), 1/15/25 1,736,196 The accompanying notes are an integral part of these financial statements. 42 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Electric Utilities -- (continued) 1,243,305 Dayton Power & Light Co., Term Loan, 4.31% (LIBOR + 200 bps), 8/24/22 $ 1,247,967 490,350 Exgen Renewables IV LLC, Term Loan, 5.32% (LIBOR + 300 bps), 11/28/24 495,253 396,045 Helix Gen Funding LLC, Term Loan, 6.052% (LIBOR + 375 bps), 6/3/24 372,365 984,970 St. Joseph Energy Centre, LLC, Advance Term B Loan, 5.8% (LIBOR + 350 bps), 4/10/25 994,204 2,715,441 TPF II Power LLC (TPF II Convert Midco LLC), Term Loan, 6.052% (LIBOR + 375 bps), 10/2/23 2,714,382 3,296,058 Vistra Operations Co., LLC (fka Tex Operations Co., LLC), Initial Term Loan, 4.302% (LIBOR + 200 bps), 8/4/23 3,292,614 --------------- $ 13,066,175 ------------------------------------------------------------------------------------------------------ Gas Utilities -- 0.2% 2,000,000 Centurion Pipeline Co. LLC, Initial Term Loan, 5.636% (LIBOR + 325 bps), 9/29/25 $ 2,017,500 ------------------------------------------------------------------------------------------------------ Independent Power Producers & Energy Traders -- 0.5% 1,010,167 Calpine Corp., Term Loan, 4.89% (LIBOR + 250 bps), 1/15/24 $ 1,007,992 1,444,850 NRG Energy, Inc., Term Loan, 4.136% (LIBOR + 175 bps), 6/30/23 1,440,696 1,270,482 TerraForm AP Acquisition Holdings LLC, Term Loan, 6.636% (LIBOR + 425 bps), 6/27/22 1,270,482 1,269,303 TerraForm Power Operating LLC, Specified Refinancing Term Loan, 4.302% (LIBOR + 200 bps), 11/8/22 1,269,303 --------------- $ 4,988,473 ------------------------------------------------------------------------------------------------------ Multi-Utilities -- 0.2% 1,917,653 Compass Power Generation LLC, Tranche B-1 Term Loan, 5.802% (LIBOR + 350 bps), 12/20/24 $ 1,930,837 ------------------------------------------------------------------------------------------------------ Water Utilities -- 0.3% 911,790 Culligan NewCo., Ltd., First Lien Tranche B-1 Term Loan, 5.552% (LIBOR + 325 bps), 12/13/23 $ 910,367 1,865,650 EWT Holdings III Corp., Refinancing 2017-2 First Lien Term Loan, 5.302% (LIBOR + 300 bps), 12/20/24 1,863,318 --------------- $ 2,773,685 --------------- Total Utilities $ 24,776,670 ------------------------------------------------------------------------------------------------------ TOTAL SENIOR SECURED FLOATING RATE LOAN INTERESTS (Cost $849,090,696) $ 847,315,709 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 43 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Shares Value ------------------------------------------------------------------------------------------------------ COMMON STOCK -- 0.0%+ of Net Assets RETAILING -- 0.0%+ Computer & Electronics Retail -- 0.0%+ 54,675^(c) Targus Cayman SubCo., Ltd. $ 113,724 --------------- Total Retailing $ 113,724 ------------------------------------------------------------------------------------------------------ TOTAL COMMON STOCK (Cost $191,363) $ 113,724 ------------------------------------------------------------------------------------------------------ PREFERRED STOCK -- 0.1% of Net Assets DIVERSIFIED FINANCIALS -- 0.1% Consumer Finance -- 0.1% 10,902(d) GMAC Capital Trust I, 8.099% (3 Month USD LIBOR + 579 bps), 2/15/40 $ 286,287 --------------- Total Diversified Financials $ 286,287 ------------------------------------------------------------------------------------------------------ TOTAL PREFERRED STOCK (Cost $286,177) $ 286,287 ------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) ------------------------------------------------------------------------------------------------------ ASSET BACKED SECURITIES -- 0.4% of Net Assets BANKS -- 0.4% Thrifts & Mortgage Finance -- 0.4% 1,000,000(a) Hertz Fleet Lease Funding LP, Series 2016-1, Class E, 5.784% (1 Month USD LIBOR + 350 bps), 4/10/30 (144A) $ 1,002,593 1,500,000(a) Home Partners of America Trust, Series 2016-2, Class E, 6.07% (1 Month USD LIBOR + 378 bps), 10/17/33 (144A) 1,502,623 875,000(a) Palmer Square Loan Funding, Ltd., Series 2018-1A, Class D, 6.386% (3 Month USD LIBOR + 395 bps), 4/15/26 (144A) 860,110 --------------- Total Banks $ 3,365,326 ------------------------------------------------------------------------------------------------------ TOTAL ASSET BACKED SECURITIES (Cost $3,384,781) $ 3,365,326 ------------------------------------------------------------------------------------------------------ COLLATERALIZED MORTGAGE OBLIGATIONS -- 0.4% of Net Assets BANKS -- 0.4% Thrifts & Mortgage Finance -- 0.4% 1,000,000(a) Citigroup Commercial Mortgage Trust, Series 2015-SHP2, Class D, 5.58% (1 Month USD LIBOR + 330 bps), 7/15/27 (144A) $ 1,009,835 1,400,000(a) Commercial Mortgage Trust, Series 2014-FL5, Class D, 6.28% (1 Month USD LIBOR + 400 bps), 10/15/31 (144A) 1,363,610 1,035,770(a) GS Mortgage Securities Trust, Series 2014-GSFL, Class D, 5.582% (1 Month USD LIBOR + 390 bps), 7/15/31 (144A) 1,041,613 --------------- Total Banks $ 3,415,058 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 44 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ DIVERSIFIED FINANCIALS -- 0.0%+ Other Diversified Financial Services -- 0.0%+ 69,390(a) Velocity Commercial Capital Loan Trust, Series 2011-1, 6.216% (1 Month USD LIBOR + 400 bps), 8/25/40 (144A) $ 69,791 --------------- Total Diversified Financials $ 69,791 ------------------------------------------------------------------------------------------------------ TOTAL COLLATERALIZED MORTGAGE OBLIGATIONS (Cost $3,359,622) $ 3,484,849 ------------------------------------------------------------------------------------------------------ CORPORATE BONDS -- 3.2% of Net Assets BANKS -- 0.3% Diversified Banks -- 0.3% 1,000,000(d)(e) Bank of America Corp., 6.3% (3 Month USD LIBOR + 455 bps) $ 1,053,750 1,550,000(d)(e) BNP Paribas SA, 7.625% (5 Year USD Swap Rate + 631 bps) (144A) 1,610,062 --------------- Total Banks $ 2,663,812 ------------------------------------------------------------------------------------------------------ CAPITAL GOODS -- 0.1% Construction & Engineering -- 0.1% 750,000 MasTec, Inc., 4.875%, 3/15/23 $ 731,250 --------------- Total Capital Goods $ 731,250 ------------------------------------------------------------------------------------------------------ DIVERSIFIED FINANCIALS -- 0.4% Diversified Capital Markets -- 0.1% 1,000,000 Avation Capital SA, 6.5%, 5/15/21 (144A) $ 1,002,500 ------------------------------------------------------------------------------------------------------ Investment Banking & Brokerage -- 0.2% 1,500,000(a) Goldman Sachs Group, Inc., 4.081% (3 Month USD LIBOR + 177 bps), 2/25/21 $ 1,541,220 ------------------------------------------------------------------------------------------------------ Specialized Finance -- 0.1% 1,000,000 Nationstar Mortgage LLC/Nationstar Capital Corp., 6.5%, 7/1/21 $ 999,470 --------------- Total Diversified Financials $ 3,543,190 ------------------------------------------------------------------------------------------------------ ENERGY -- 0.8% Oil & Gas Equipment & Services -- 0.2% 1,000,000 Archrock Partners LP/Archrock Partners Finance Corp., 6.0%, 10/1/22 $ 990,000 1,000,000 FTS International, Inc., 6.25%, 5/1/22 953,750 --------------- $ 1,943,750 ------------------------------------------------------------------------------------------------------ Oil & Gas Exploration & Production -- 0.4% 485,000 Gulfport Energy Corp., 6.625%, 5/1/23 $ 485,000 947,000 Oasis Petroleum, Inc., 6.875%, 3/15/22 952,919 2,750,000 Resolute Energy Corp., 8.5%, 5/1/20 2,743,125 --------------- $ 4,181,044 ------------------------------------------------------------------------------------------------------ Oil & Gas Storage & Transportation -- 0.2% 1,400,000(a) Golar LNG Partners LP, 8.564% (3 Month USD LIBOR + 625 bps), 5/18/21 (144A) $ 1,403,510 --------------- Total Energy $ 7,528,304 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 45 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ FOOD, BEVERAGE & TOBACCO -- 0.1% Distillers & Vintners -- 0.0%+ 359,000 Pernod Ricard SA, 4.45%, 1/15/22 (144A) $ 365,697 ------------------------------------------------------------------------------------------------------ Packaged Foods & Meats -- 0.1% 400,000(a) Tyson Foods, Inc., 2.871% (3 Month USD LIBOR + 55 bps), 6/2/20 $ 400,814 --------------- Total Food, Beverage & Tobacco $ 766,511 ------------------------------------------------------------------------------------------------------ HEALTH CARE EQUIPMENT & SERVICES -- 0.5% Health Care Facilities -- 0.3% 600,000 CHS/Community Health Systems, Inc., 6.25%, 3/31/23 $ 551,820 96,000 CHS/Community Health Systems, Inc., 8.125%, 6/30/24 (144A) 75,840 2,000,000 HCA, Inc., 5.375%, 2/1/25 2,012,500 310,000 RegionalCare Hospital Partners Holdings, Inc., 8.25%, 5/1/23 (144A) 327,438 --------------- $ 2,967,598 ------------------------------------------------------------------------------------------------------ Health Care Services -- 0.0%+ 269,000 Universal Hospital Services, Inc., 7.625%, 8/15/20 $ 269,336 ------------------------------------------------------------------------------------------------------ Managed Health Care -- 0.2% 1,000,000 Centene Corp., 5.625%, 2/15/21 $ 1,015,000 1,000,000 Molina Healthcare, Inc., 5.375%, 11/15/22 1,000,000 --------------- $ 2,015,000 --------------- Total Health Care Equipment & Services $ 5,251,934 ------------------------------------------------------------------------------------------------------ MATERIALS -- 0.2% Diversified Metals & Mining -- 0.1% 376,000 Rain CII Carbon LLC/CII Carbon Corp., 7.25%, 4/1/25 (144A) $ 378,820 ------------------------------------------------------------------------------------------------------ Metal & Glass Containers -- 0.1% 1,150,000(a) Reynolds Group Issuer, Inc./Reynolds Group Issuer LLC/Reynolds Group Issuer Lu, 5.936% (3 Month USD LIBOR + 350 bps), 7/15/21 (144A) $ 1,161,500 --------------- Total Materials $ 1,540,320 ------------------------------------------------------------------------------------------------------ MEDIA & ENTERTAINMENT -- 0.3% Advertising -- 0.1% 370,000 MDC Partners, Inc., 6.5%, 5/1/24 (144A) $ 303,400 ------------------------------------------------------------------------------------------------------ Cable & Satellite -- 0.2% 1,250,000 Hughes Satellite Systems Corp., 5.25%, 8/1/26 $ 1,187,500 1,000,000 Sirius XM Radio, Inc., 3.875%, 8/1/22 (144A) 962,500 --------------- $ 2,150,000 --------------- Total Media & Entertainment $ 2,453,400 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 46 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 0.1% Pharmaceuticals -- 0.1% 1,000,000 Valeant Pharmaceuticals International, Inc., 5.5%, 11/1/25 (144A) $ 980,000 --------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 980,000 ------------------------------------------------------------------------------------------------------ RETAILING -- 0.3% Automotive Retail -- 0.0%+ 391,000 Penske Automotive Group, Inc., 3.75%, 8/15/20 $ 387,090 ------------------------------------------------------------------------------------------------------ Internet Retail -- 0.3% 1,500,000 Booking Holdings, Inc., 3.6%, 6/1/26 $ 1,432,559 1,500,000 Expedia Group, Inc., 4.5%, 8/15/24 1,478,290 --------------- $ 2,910,849 --------------- Total Retailing $ 3,297,939 ------------------------------------------------------------------------------------------------------ TELECOMMUNICATION SERVICES -- 0.0%+ Wireless Telecommunication Services -- 0.0%+ 500,000 Intelsat Jackson Holdings SA, 8.0%, 2/15/24 (144A) $ 523,125 --------------- Total Telecommunication Services $ 523,125 ------------------------------------------------------------------------------------------------------ TRANSPORTATION -- 0.1% Airlines -- 0.1% 932,357 Air Canada 2013-1 Class B Pass Through Trust, 5.375%, 5/15/21 (144A) $ 949,839 360,000 Air Canada 2015-1 Class C Pass Through Trust, 5.0%, 3/15/20 (144A) 361,800 --------------- Total Transportation $ 1,311,639 ------------------------------------------------------------------------------------------------------ TOTAL CORPORATE BONDS (Cost $ 30,858,385) $ 30,591,424 ------------------------------------------------------------------------------------------------------ INSURANCE-LINKED SECURITIES -- 1.7% of Net Assets(1) CATASTROPHE LINKED BONDS -- 0.8% Earthquakes - California -- 0.1% 500,000(a) Ursa Re, 3.5% (ZERO + 350 bps), 5/27/20 (144A) $ 500,750 ------------------------------------------------------------------------------------------------------ Multiperil - U.S. -- 0.5% 350,000(a) Kilimanjaro Re, 6.858% (3 Month USD LIBOR + 465 bps), 5/6/22 (144A) $ 349,650 500,000(a) Kilimanjaro Re, 9.08% (3 Month U.S. Treasury Bill + 675 bps), 12/6/19 (144A) 505,300 250,000(a) Kilimanjaro Re, 11.58% (3 Month U.S. Treasury Bill + 925 bps), 12/6/19 (144A) 255,025 600,000(a) Kilimanjaro II Re, 8.021% (6 Month USD LIBOR + 572 bps), 4/20/21 (144A) 601,800 300,000+(a) Panthera Re 2018-1, 5.83% (3 Month U.S. Treasury Bill + 350 bps), 3/9/20 (144A) 303,120 500,000(a) PennUnion Re, 6.83% (3 Month U.S. Treasury Bill + 450 bps), 12/7/18 (144A) 501,300 The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 47 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Multiperil - U.S. -- (continued) 250,000(a) Residential Reinsurance 2015, 9.105% (3 Month U.S. Treasury Bill + 678 bps), 12/6/19 (144A) $ 254,475 350,000(a) Residential Reinsurance 2016, 6.145% (3 Month U.S. Treasury Bill + 382 bps), 12/6/20 (144A) 354,375 500,000(a) Residential Reinsurance 2017, 7.865% (3 Month U.S. Treasury Bill + 554 bps), 12/6/21 (144A) 492,350 300,000(a) Sanders Re, 5.253% (6 Month USD LIBOR + 307 bps), 12/6/21 (144A) 293,130 350,000(a) Tailwind Re 2017-1, 9.58% (3 Month U.S. Treasury Bill + 725 bps), 1/8/22 (144A) 355,390 --------------- $ 4,265,915 ------------------------------------------------------------------------------------------------------ Multiperil - Worldwide -- 0.2% 400,000(a) Galilei Re, 6.84% (6 Month USD LIBOR + 466 bps), 1/8/20 (144A) $ 403,200 250,000(a) Galilei Re, 6.86% (6 Month USD LIBOR + 466 bps), 1/8/21 (144A) 250,200 300,000(a) Galilei Re, 7.63% (6 Month USD LIBOR + 545 bps), 1/8/20 (144A) 300,990 300,000(a) Galilei Re, 7.65% (6 Month USD LIBOR + 545 bps), 1/8/21 (144A) 300,840 300,000(a) Galilei Re, 8.71% (6 Month USD LIBOR + 653 bps), 1/8/20 (144A) 299,940 600,000(a) Galilei Re, 8.73% (6 Month USD LIBOR + 653 bps), 1/8/21 (144A) 601,020 --------------- $ 2,156,190 --------------- Total Catastrophe Linked Bonds $ 6,922,855 ------------------------------------------------------------------------------------------------------ COLLATERALIZED REINSURANCE -- 0.2% Earthquakes - California -- 0.1% 500,000+(f) Resilience Re, Variable Rate Notes, 1/8/19 (144A) $ 500,000 400,000+(f) Resilience Re, Variable Rate Notes, 10/15/19 420,680 --------------- $ 920,680 ------------------------------------------------------------------------------------------------------ Multiperil - Worldwide -- 0.1% 326,836+(f) Kilarney Re 2018, Variable Rate Notes, 4/15/19 $ 310,984 250,000+(f) Limestone Re 2016-1, Variable Rate Notes, 8/31/21 248,025 250,000+(f) Resilience Re, Variable Rate Notes, 4/8/19 248,975 300,000+(f) Resilience Re, Variable Rate Notes, 5/1/19 3,000 --------------- $ 810,984 ------------------------------------------------------------------------------------------------------ Windstorm - Florida -- 0.0%+ 300,000+(f) Formby Re 2018, Variable Rate Notes, 6/15/19 $ 307,410 102,242+(f) Formby Re 2018-2, Variable Rate Notes, 12/31/18 100,003 --------------- $ 407,413 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 48 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------ Principal Amount USD ($) Value ------------------------------------------------------------------------------------------------------ Windstorm - U.S. Regional -- 0.0%+ 300,000+(f) Promissum Re 2018, Variable Rate Notes, 6/15/19 $ 292,890 --------------- Total Collateralized Reinsurance $ 2,431,967 ------------------------------------------------------------------------------------------------------ INDUSTRY LOSS WARRANTIES -- 0.1% Multiperil - U.S. -- 0.1% 800,000+(f) Pinehurst Re 2018, Variable Rate Notes, 1/15/19 $ 797,840 --------------- Total Industry Loss Warranties $ 797,840 ------------------------------------------------------------------------------------------------------ REINSURANCE SIDECARS -- 0.6% Multiperil - U.S. -- 0.0%+ 600,000+(f) Carnoustie Re 2016, Variable Rate Notes, 11/30/20 $ 16,200 600,000+(f) Carnoustie Re 2017, Variable Rate Notes, 11/30/21 152,520 400,000+(f) Harambee Re 2018, Variable Rate Notes, 12/31/21 429,080 --------------- $ 597,800 ------------------------------------------------------------------------------------------------------ Multiperil - Worldwide -- 0.6% 1,635,886+(f) Berwick Re 2018-1, Variable Rate Notes, 12/31/21 $ 1,601,205 600,000+(f) Eden Re II, Variable Rate Notes, 3/22/22 (144A) 626,520 350,000+(f) Gleneagles Re 2016, Variable Rate Notes, 11/30/20 21,700 400,000+(f) Limestone Re 2018, Variable Rate Notes, 3/1/22 412,760 700,000+(f) Lorenz Re 2018, Variable Rate Notes, 7/1/21 692,230 250,000+(f) Madison Re 2016, Variable Rate Notes, 3/31/19 6,950 400,000+(f) Merion Re 2018-2, Variable Rate Notes, 12/31/21 431,360 600,000+(f) Pangaea Re 2016-1, Variable Rate Notes, 11/30/20 3,480 600,000+(f) Pangaea Re 2018-1, Variable Rate Notes, 12/31/21 612,780 600,000+(f) Pangaea Re 2018-3, Variable Rate Notes, 7/1/22 548,760 600,000+(f) St. Andrews Re 2017-1, Variable Rate Notes, 2/1/19 40,680 695,194+(f) St. Andrews Re 2017-4, Variable Rate Notes, 6/1/19 68,407 253,645+(f) Woburn Re 2018, Variable Rate Notes, 12/31/21 265,389 --------------- $ 5,332,221 --------------- Total Reinsurance Sidecars $ 5,930,021 ------------------------------------------------------------------------------------------------------ TOTAL INSURANCE-LINKED SECURITIES (Cost $15,967,150) $ 16,082,683 ------------------------------------------------------------------------------------------------------ U.S. GOVERNMENT AND AGENCY OBLIGATIONS -- 9.1% of Net Assets 34,000,000(g) United States Treasury Bills, 11/1/18 $ 34,000,000 14,350,000(g) United States Treasury Bills, 11/8/18 14,344,168 4,785,000(g) United States Treasury Bills, 11/15/18 4,781,069 28,000,000(g) United States Treasury Bills, 11/29/18 27,952,933 4,865,000(g) United States Treasury Bills, 1/24/19 4,839,388 ------------------------------------------------------------------------------------------------------ TOTAL U.S. GOVERNMENT AND AGENCY OBLIGATIONS (Cost $85,917,229) $ 85,917,558 ------------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 49 Schedule of Investments | 10/31/18 (continued) ------------------------------------------------------------------------------------------------------ Shares Value ------------------------------------------------------------------------------------------------------ INVESTMENT COMPANIES -- 0.8% of Net Assets BANKS -- 0.0%+ Diversified Banks -- 0.0%+ 100,000 Invesco Senior Income Trust $ 414,000 --------------- Total Banks $ 414,000 ------------------------------------------------------------------------------------------------------ DIVERSIFIED FINANCIALS -- 0.8% Asset Management & Custody Banks -- 0.4% 100,000 BlackRock Floating Rate Income Strategies Fund, Inc. $ 1,297,000 100,000 Eaton Vance Floating-Rate Income Trust 1,374,000 100,000 First Trust Senior Floating Rate Income Fund II 1,204,000 --------------- $ 3,875,000 ------------------------------------------------------------------------------------------------------ Other Diversified Financial Services -- 0.1% 50,000 Invesco Senior Loan ETF $ 1,150,500 ------------------------------------------------------------------------------------------------------ Specialized Finance -- 0.3% 36,000 iShares iBoxx $ High Yield Corporate Bond ETF $ 3,036,600 --------------- Total Diversified Financials $ 8,062,100 ------------------------------------------------------------------------------------------------------ TOTAL INVESTMENT COMPANIES (Cost $8,864,754) $ 8,476,100 ------------------------------------------------------------------------------------------------------ TOTAL INVESTMENTS IN UNAFFILIATED ISSUERS -- 105.6% (Cost $997,920,157) $ 995,633,660 ------------------------------------------------------------------------------------------------------ OTHER ASSETS AND LIABILITIES -- (5.6)% $ (53,033,278) ------------------------------------------------------------------------------------------------------ NET ASSETS -- 100.0% $ 942,600,382 ====================================================================================================== (1) Securities are restricted as to resale. bps Basis Points. LIBOR London Interbank Offered Rate. PRIME U.S. Federal Funds Rate. REIT Real Estate Investment Trust. ZERO Zero Constant Index. (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 October 31, 2018, the value of these securities amounted to $25,305,581, or 2.7% of net assets. + Amount rounds to less than 0.1%. * Senior secured 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, (ii) the prime rate offered by one or more major United States banks, (iii) the rate of a certificate of deposit or (iv) other base lending rates used by commercial lenders. The interest rate shown is the rate accruing at October 31, 2018. + Securities that used significant unobservable inputs to determine their value. ^ Security is valued using fair value methods (other than prices supplied by independent pricing services). See Notes to Financial Statements -- Note 1A. The accompanying notes are an integral part of these financial statements. 50 Pioneer Floating Rate Fund | Annual Report | 10/31/18 (a) Floating rate note. Coupon rate, reference index and spread shown at October 31, 2018. (b) This term loan will settle after October 31, 2018, at which time the interest rate will be determined. (c) Non-income producing security. (d) The interest rate is subject to change periodically. The interest rate and/or reference index and spread shown at October 31, 2018. (e) Security is perpetual in nature and has no stated maturity date. (f) Rate to be determined. (g) Security issued with a zero coupon. Income is recognized through accretion of discount. FORWARD FOREIGN CURRENCY CONTRACT ------------------------------------------------------------------------------------------------------ Currency In Currency Settlement Unrealized Purchased Exchange for Sold Deliver Counterparty Date Appreciation ------------------------------------------------------------------------------------------------------ USD 2,279,652 EUR (1,985,002) JPMorgan 1/31/19 $14,211 Chase Bank NA ------------------------------------------------------------------------------------------------------ TOTAL FORWARD FOREIGN CURRENCY CONTRACT $14,211 ====================================================================================================== SWAP CONTRACTS CENTRALLY CLEARED CREDIT DEFAULT SWAP CONTRACTS -- SELL PROTECTION ------------------------------------------------------------------------------------------------------ Net Obligation Annual Unrealized Notional Reference/ Pay/ Fixed Expiration Premiums Appreciation Market Amount ($)(1) Index Receive(2) Rate Date Paid (Depreciation) Value ------------------------------------------------------------------------------------------------------ 1,306,250 Markit CDX North Receive 5.00% 6/20/20 $ 69,761 $ (503) $ 69,258 America High Yield Index Series 24 3,000,000 Markit CDX North Receive 1.00% 12/20/20 54,248 (10,329) 43,919 America High Yield Index Series 25 1,468,800 Markit CDX North Receive 5.00% 12/20/20 81,453 7,505 88,958 America High Yield Index Series 25 7,389,200 Markit CDX North Receive 5.00% 12/20/21 521,831 1,666 523,497 America High Yield Index Series 27 ------------------------------------------------------------------------------------------------------ TOTAL SWAP CONTRACTS $727,293 $ (1,661) $725,632 ====================================================================================================== (1) The notional amount is the maximum amount that a seller of credit protection would be obligated to pay upon occurrence of a credit event. (2) Receives Quarterly. Principal amounts are denominated in U.S. dollars ("USD") unless otherwise noted. EUR -- Euro The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 51 Schedule of Investments | 10/31/18 (continued) Purchases and sales of securities (excluding temporary cash investments) for the year ended October 31, 2018 were as follows: ------------------------------------------------------------------------------------------------------ Purchases Sales ------------------------------------------------------------------------------------------------------ Long-Term U.S. Government $ -- $ 47,816,605 Other Long-Term Securities $419,333,742 $307,012,184 The Fund is permitted to engage in purchase and sale transactions ("cross trades") with certain funds and accounts for which Amundi Pioneer Asset Management, Inc., (the "Adviser"), serves as the Fund's investment adviser, as set forth in Rule 17a-7 under the Investment Company Act of 1940, pursuant to procedures adopted by the Board of Trustees. Under these procedures, cross trades are effected at current market prices. During the year ended October 31, 2018, the Fund engaged in purchases of $2,075,645 and sales of $0 pursuant to these procedures, which resulted in a net realized gain/loss of $0. At October 31, 2018, the net unrealized depreciation on investments based on cost for federal tax purposes of $999,032,198 was as follows: Aggregate gross unrealized appreciation for all investments in which there is an excess of value over tax cost $ 4,738,183 Aggregate gross unrealized depreciation for all investments in which there is an excess of tax cost over value (7,396,878) ----------- Net unrealized depreciation $(2,658,695) =========== Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels 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 risks, etc.). See Notes to Financial Statements -- Note 1A. Level 3 - significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments). See Notes to Financial Statements -- Note 1A. The following is a summary of the inputs used as of October 31, 2018, in valuing the Fund's investments. ------------------------------------------------------------------------------------------ Level 1 Level 2 Level 3 Total ------------------------------------------------------------------------------------------ Senior Secured Floating Rate Loan Interests $ -- $ 847,315,709 $ -- $ 847,315,709 Common Stock -- -- 113,724 113,724 Preferred Stock 286,287 -- -- 286,287 Asset Backed Securities -- 3,365,326 -- 3,365,326 Collateralized Mortgage Obligations -- 3,484,849 -- 3,484,849 Corporate Bonds -- 30,591,424 -- 30,591,424 Insurance-Linked Securities Catastrophe Linked Bonds Multiperil - U.S. -- 3,962,795 303,120 4,265,915 Collateralized Reinsurance Earthquakes - California -- -- 920,680 920,680 Multiperil - Worldwide -- -- 810,984 810,984 Windstorm - Florida -- -- 407,413 407,413 Windstorm - U.S. Regional -- -- 292,890 292,890 The accompanying notes are an integral part of these financial statements. 52 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------ Level 1 Level 2 Level 3 Total ------------------------------------------------------------------------------------------ Industry Loss Warranties Multiperil - U.S. $ -- $ -- $ 797,840 $ 797,840 Reinsurance Sidecars Multiperil - U.S. -- -- 597,800 597,800 Multiperil - Worldwide -- -- 5,332,221 5,332,221 All Other Insurance-Linked Securities -- 2,656,940 -- 2,656,940 U.S. Government and Agency Obligations -- 85,917,558 -- 85,917,558 Investment Companies 8,476,100 -- -- 8,476,100 ------------------------------------------------------------------------------------------ Total Investments in Securities $ 8,762,387 $ 977,294,601 $ 9,576,672 $ 995,633,660 ========================================================================================== Other Financial Instruments Unrealized appreciation on forward foreign currency contracts $ -- $ 14,211 $ -- $ 14,211 Swap contracts, at value -- 725,632 -- 725,632 ------------------------------------------------------------------------------------------ Total Other Financial Instruments $ -- $ 739,843 $ -- $ 739,843 ========================================================================================== The following is a reconciliation of assets valued using significant unobservable inputs (Level 3): ------------------------------------------------------------------------------- Insurance- Common Linked Stocks Securities Loans Total ------------------------------------------------------------------------------- Balance as of 10/31/17 $107,710 $ 5,431,036(a) $ 1,066,938 $ 6,605,684 Realized gain (loss)(1) -- (16,858) 28,549 11,691 Change in unrealized appreciation (depreciation)(2) 6,014 (112,030) (8,936) (114,952) Accrued discounts/ premiums -- -- 1,564 1,564 Purchases -- 8,539,444 -- 8,539,444 Sales -- (4,378,644) (1,088,115) (5,466,759) Transfers in to Level 3* -- -- -- -- Transfers out of Level 3* -- -- -- -- ------------------------------------------------------------------------------- Balance as of 10/31/18 $113,724 $ 9,462,948 $ -- $ 9,576,672 =============================================================================== (a) Securities were classified as Corporate Bonds on October 31, 2017 financial statements. (1) Realized gain (loss) on these securities is included in the realized gain (loss) from investments on the Statement of Operations. (2) Unrealized appreciation (depreciation) on these securities is included in the change in unrealized appreciation (depreciation) from investments on the Statement of Operations. * Transfers are calculated on the beginning of period value. For the year ended October 31, 2018, there were no transfers between levels 1, 2 and 3. Net change in unrealized appreciation (depreciation) of Level 3 investments still held and considered Level 3 at October 31, 2018: $94,141 ------- The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 53 Statement of Assets and Liabilities | 10/31/18 ASSETS: Investments in unaffiliated issuers, at value (cost $997,920,157) $ 995,633,660 Cash 1,512,083 Foreign currencies, at value (cost $17,375) 17,349 Swaps collateral 567,668 Variation margin for centrally cleared swap contracts 13,306 Swap contracts, at value (net premiums paid $727,293) 725,632 Unrealized appreciation on forward foreign currency contracts 14,211 Unrealized appreciation on unfunded loan commitments 9,648 Receivables -- Investment securities sold 10,396,034 Fund shares sold 2,990,858 Interest 2,297,286 Due from the Adviser 168,161 Other assets 52,071 ----------------------------------------------------------------------------------------- Total assets $1,014,397,967 ========================================================================================= LIABILITIES: Payables -- Investment securities purchased $ 67,453,332 Fund shares repurchased 2,708,654 Distributions 389,999 Trustees' fees 3,501 Due to broker for swap contracts 722,510 Due to affiliates 91,199 Accrued expenses 428,390 ----------------------------------------------------------------------------------------- Total liabilities $ 71,797,585 ========================================================================================= NET ASSETS: Paid-in capital $ 964,367,897 Distributable earnings (loss) (21,767,515) ----------------------------------------------------------------------------------------- Net assets $ 942,600,382 ========================================================================================= NET ASSET VALUE PER SHARE: No par value (unlimited number of shares authorized) Class A (based on $161,020,273/23,910,337 shares) $ 6.73 Class C (based on $68,364,349/10,145,263 shares) $ 6.74 Class Y (based on $713,215,760/105,637,861 shares) $ 6.75 MAXIMUM OFFERING PRICE PER SHARE: Class A (based on $6.73 net asset value per share/ 100%-4.50% maximum sales charge) $ 7.05 ========================================================================================= The accompanying notes are an integral part of these financial statements. 54 Pioneer Floating Rate Fund | Annual Report | 10/31/18 Statement of Operations For the Year Ended 10/31/18 INVESTMENT INCOME: Interest from unaffiliated issuers $ 43,056,449 Dividends from unaffiliated issuers (net of foreign taxes withheld $238) 477,781 ------------------------------------------------------------------------------------------------- Total investment income $ 43,534,230 ================================================================================================= EXPENSES: Management fees $ 5,115,220 Administrative expense 274,428 Transfer agent fees Class A 126,632 Class C 54,297 Class Y 484,517 Distribution fees Class A 441,693 Class C 744,266 Shareowner communications expense 38,026 Custodian fees 73,995 Registration fees 92,611 Professional fees 102,737 Printing expense 36,183 Pricing fees 65,922 Trustees' fees 35,727 Insurance expense 10,201 Miscellaneous 262,205 ------------------------------------------------------------------------------------------------- Total expenses $ 7,958,660 Less fees waived and expenses reimbursed by the Adviser (425,907) ------------------------------------------------------------------------------------------------- Net expenses $ 7,532,753 ------------------------------------------------------------------------------------------------- Net investment income $ 36,001,477 ------------------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS: Net realized gain (loss) on: Investments in unaffiliated issuers $ (3,004,866) Forward foreign currency contracts 228,862 Swap contracts 713,659 Other assets and liabilities denominated in foreign currencies (53,786) $ (2,116,131) ------------------------------------------------------------------------------------------------- Change in net unrealized appreciation (depreciation) on: Investments in unaffiliated issuers $ (5,613,908) Forward foreign currency contracts 14,211 Swap contracts (477,988) Unfunded loan commitments 9,648 Other assets and liabilities denominated in foreign currencies (55,434) $ (6,123,471) ------------------------------------------------------------------------------------------------- Net realized and unrealized gain (loss) on investments $ (8,239,602) ------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 27,761,875 ================================================================================================= The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 55 Statements of Changes in Net Assets ------------------------------------------------------------------------------------------ Year Year Ended Ended 10/31/18 10/31/17 ------------------------------------------------------------------------------------------ FROM OPERATIONS: Net investment income (loss) $ 36,001,477 $ 30,827,302 Net realized gain (loss) on investments (2,116,131) (803,351) Change in net unrealized appreciation (depreciation) on investments (6,123,471) 1,636,548 ------------------------------------------------------------------------------------------ Net increase in net assets resulting from operations $ 27,761,875 $ 31,660,499 ------------------------------------------------------------------------------------------ DISTRIBUTIONS TO SHAREOWNERS: Class A ($0.27 and $0.24 per share, respectively) $ (6,978,239) $ (6,923,555)*** Class C ($0.22 and $0.19 per share, respectively) (2,383,910) (2,336,352)*** Class K* ($-- and $0.24 per share, respectively) -- (12,368)*** Class Y ($0.29 and $0.26 per share, respectively) (26,910,705) (21,158,154)*** ------------------------------------------------------------------------------------------ Total distributions to shareowners $ (36,272,854) $ (30,430,429) ------------------------------------------------------------------------------------------ FROM FUND SHARE TRANSACTIONS: Net proceeds from sales of shares $ 414,179,477 $ 391,242,498 Reinvestment of distributions 32,093,449 27,914,969 Cost of shares repurchased (361,051,827) (288,319,155) ------------------------------------------------------------------------------------------ Net increase in net assets resulting from Fund share transactions $ 85,221,099 $ 130,838,312 ------------------------------------------------------------------------------------------ Net increase in net assets $ 76,710,120 $ 132,068,382 NET ASSETS:** Beginning of year $ 865,890,262 $ 733,821,880 ------------------------------------------------------------------------------------------ End of year $ 942,600,382 $ 865,890,262 ========================================================================================== * Class K shares had no assets or shareowners for periods after October 4, 2017. ** For the year ended October 31, 2017 undistributed net investment income was presented as follows: $821,591. *** For the year ended October 31, 2017 distributions to shareowners were presented as net investment income. The accompanying notes are an integral part of these financial statements. 56 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------- Year Ended Year Ended Year Ended Year Ended 10/31/18 10/31/18 10/31/17 10/31/17 Shares Amount Shares Amount ------------------------------------------------------------------------------------- Class A Shares sold 9,683,451 $ 65,540,109 8,672,241 $ 58,946,960 Reinvestment of distributions 975,066 6,596,289 974,592 6,624,723 Less shares repurchased (15,163,284) (102,659,897) (9,869,591) (67,079,839) ------------------------------------------------------------------------------------- Net decrease (4,504,767) $ (30,523,499) (222,758) $ (1,508,156) ===================================================================================== Class C Shares sold 2,506,138 $ 16,969,718 2,570,564 $ 17,480,458 Reinvestment of distributions 325,208 2,201,908 318,001 2,163,592 Less shares repurchased (4,306,823) (29,161,062) (3,864,560) (26,287,345) ------------------------------------------------------------------------------------- Net decrease (1,475,477) $ (9,989,436) (975,995) $ (6,643,295) ===================================================================================== Class K* Shares sold -- $ -- -- $ -- Reinvestment of distributions -- -- -- -- Less shares repurchased -- -- (102,850) (699,035) ------------------------------------------------------------------------------------- Net decrease -- $ -- (102,850) $ (699,035) ===================================================================================== Class Y Shares sold 48,878,516 $ 331,669,650 46,208,677 $ 314,815,080 Reinvestment of distributions 3,435,561 23,295,252 2,806,943 19,126,654 Less shares repurchased (33,777,903) (229,230,868) (28,499,823) (194,252,936) ------------------------------------------------------------------------------------- Net increase 18,536,174 $ 125,734,034 20,515,797 $ 139,688,798 ===================================================================================== * Class K shares had no assets or shareowners for periods after October 4, 2017. The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 57 Financial Highlights ------------------------------------------------------------------------------------------------------------------------------------ Year Year Year Year Year Ended Ended Ended Ended Ended 10/31/18 10/31/17 10/31/16* 10/31/15* 10/31/14* ------------------------------------------------------------------------------------------------------------------------------------ Class A Net asset value, beginning of period $ 6.80 $ 6.79 $ 6.73 $ 6.86 $ 6.95 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) $ 0.26(a) $ 0.24(a) $ 0.24(a) $ 0.24(a) $ 0.24 Net realized and unrealized gain (loss) on investments (0.06) 0.01 0.05 (0.14) (0.09) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.20 $ 0.25 $ 0.29 $ 0.10 $ 0.15 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.27) $ (0.24) $ (0.23) $ (0.23) $ (0.24) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (0.07) $ 0.01 $ 0.06 $ (0.13) $ (0.09) ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 6.73 $ 6.80 $ 6.79 $ 6.73 $ 6.86 ==================================================================================================================================== Total return (b) 2.96% 3.71% 4.49% 1.53% 2.17% Ratio of net expenses to average net assets 1.01% 1.02% 1.01% 1.08% 1.07% Ratio of net investment income (loss) to average net assets 3.89% 3.54% 3.66% 3.48% 3.49% Portfolio turnover rate 42% 69% 51% 24% 43% Net assets, end of period (in thousands) $161,020 $193,193 $194,408 $174,979 $238,764 Ratios with no waiver of fees and assumption of expense by the Adviser and no reduction for fees paid indirectly: Total expenses to average net assets 1.01% 1.02% 1.04% 1.10% 1.07% Net investment income (loss) to average net assets 3.89% 3.54% 3.63% 3.46% 3.49% ==================================================================================================================================== * The Fund was audited by an independent registered public accounting firm other than Ernst & Young LLP. (a) The per-share data presented above is based on the average shares outstanding for the period presented. (b) 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. The accompanying notes are an integral part of these financial statements. 58 Pioneer Floating Rate Fund | Annual Report | 10/31/18 -------------------------------------------------------------------------------------------------------------------------------- Year Year Year Year Year Ended Ended Ended Ended Ended 10/31/18 10/31/17 10/31/16* 10/31/15* 10/31/14* -------------------------------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of period $ 6.80 $ 6.79 $ 6.74 $ 6.87 $ 6.96 -------------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (loss) $ 0.21(a) $ 0.19(a) $ 0.19(a) $ 0.19(a) $ 0.19 Net realized and unrealized gain (loss) on investments (0.05) 0.01 0.05 (0.13) (0.09) -------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 0.16 $ 0.20 $ 0.24 $ 0.06 $ 0.10 -------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.22) $ (0.19) $ (0.19) $ (0.19) $ (0.19) -------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (0.06) $ 0.01 $ 0.05 $ (0.13) $ (0.09) -------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 6.74 $ 6.80 $ 6.79 $ 6.74 $ 6.87 ================================================================================================================================ Total return (b) 2.35% 2.93% 3.58% 0.81% 1.43% Ratio of net expenses to average net assets 1.76% 1.77% 1.79% 1.81% 1.78% Ratio of net investment income (loss) to average net assets 3.15% 2.78% 2.89% 2.74% 2.79% Portfolio turnover rate 42% 69% 51% 24% 43% Net assets, end of period (in thousands) $68,364 $79,057 $85,563 $92,924 $112,117 Ratios with no waiver of fees and assumption of expense by the Adviser and no reduction for fees paid indirectly: Total expenses to average net assets 1.76% 1.77% 1.81% 1.84% 1.78% Net investment income (loss) to average net assets 3.15% 2.78% 2.87% 2.71% 2.79% ================================================================================================================================ * The Fund was audited by an independent registered public accounting firm other than Ernst & Young LLP. (a) The per-share data presented above is based on the average shares outstanding for the period presented. (b) 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. The accompanying notes are an integral part of these financial statements. Pioneer Floating Rate Fund | Annual Report | 10/31/18 59 Financial Highlights (continued) ------------------------------------------------------------------------------------------------------------------------------------ Year Year Year Year Year Ended Ended Ended Ended Ended 10/31/18 10/31/17 10/31/16* 10/31/15* 10/31/14* ------------------------------------------------------------------------------------------------------------------------------------ Class Y Net asset value, beginning of period $ 6.82 $ 6.81 $ 6.75 $ 6.88 $ 6.97 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) $ 0.29(a) $ 0.26(a) $ 0.27(a) $ 0.26(a) $ 0.27 Net realized and unrealized gain (loss) on investments (0.07) 0.01 0.05 (0.13) (0.10) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.22 $ 0.27 $ 0.32 $ 0.13 $ 0.17 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.29) $ (0.26) $ (0.26) $ (0.26) $ (0.26) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (0.07) $ 0.01 $ 0.06 $ (0.13) $ (0.09) ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 6.75 $ 6.82 $ 6.81 $ 6.75 $ 6.88 ==================================================================================================================================== Total return (b) 3.27% 4.05% 4.85% 1.92% 2.50% Ratio of net expenses to average net assets 0.70% 0.70% 0.70% 0.70% 0.70% Ratio of net investment income (loss) to average net assets 4.22% 3.86% 3.97% 3.84% 3.86% Portfolio turnover rate 42% 69% 51% 24% 43% Net assets, end of period (in thousands) $713,216 $593,640 $453,152 $323,812 $352,115 Ratios with no waiver of fees and assumption of expense by the Adviser and no reduction for fees paid indirectly: Total expenses to average net assets 0.77% 0.79% 0.82% 0.82% 0.82% Net investment income (loss) to average net assets 4.15% 3.77% 3.85% 3.72% 3.74% ==================================================================================================================================== * The Fund was audited by an independent registered public accounting firm other than Ernst & Young LLP. (a) The per-share data presented above is based on the average shares outstanding for the period presented. (b) 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. The accompanying notes are an integral part of these financial statements. 60 Pioneer Floating Rate Fund | Annual Report | 10/31/18 Notes to Financial Statements | 10/31/18 1. Organization and Significant Accounting Policies Pioneer Floating Rate Fund (the "Fund") is one of three portfolios comprising Pioneer Series Trust VI, 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 produce a high level of current income. The Fund offers five classes of shares designated as Class A, Class C, Class K, Class T and Class Y shares. Class K shares did not have assets or shareholders as of October 31, 2018. Class T shares had not commenced operations as of October 31, 2018. 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 of Trustees the flexibility to specify either per-share voting or dollar-weighted voting when submitting matters for shareowner approval. Under per-share voting, each share of a class of the Fund is entitled to one vote. Under dollar-weighted voting, a shareowner'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. Amundi Pioneer Asset Management, Inc., an indirect wholly owned subsidiary of Amundi and Amundi's wholly owned subsidiary, Amundi USA, Inc., serves as the Fund's investment adviser (the "Adviser"). Amundi Pioneer Distributor, Inc., an affiliate of Amundi Pioneer Asset Management, Inc., serves as the Fund's distributor (the "Distributor"). In August 2018, the SEC released a Disclosure Update and Simplification Final Rule. The Final Rule amends Regulation S-X disclosures requirements to conform them to U.S. Generally Accepted Accounting Principles ("U.S. GAAP") for investment companies. The Fund's financial statements were prepared in compliance with the new amendments to Regulation S-X. The Fund is an investment company and follows investment company accounting and reporting guidance under U.S. GAAP. U.S. GAAP requires the management of the Fund to make estimates and assumptions that affect the Pioneer Floating Rate Fund | Annual Report | 10/31/18 61 reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of income, expenses and gain or loss on investments during the reporting period. Actual results could differ from those estimates. The following is a summary of significant accounting policies followed by the Fund in the preparation of its financial statements: A. Security Valuation The net asset value of the Fund is computed once daily, on each day the New York Stock Exchange ("NYSE") is open, as of the close of regular trading on the NYSE. Fixed-income securities are valued by using 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, or may use a pricing matrix or other fair value methods or techniques to provide an estimated value of the security or instrument. A pricing matrix is a means of valuing a debt security on the basis of current market prices for other debt securities, historical trading patterns in the market for fixed-income securities and/or other factors. Non-U.S. debt securities that are listed on an exchange will be valued at the bid price obtained from an independent third party pricing service. When independent third party pricing services are unable to supply prices, or when prices or market quotations are considered to be unreliable, the value of that security may be determined using quotations from one or more broker-dealers. Loan interests 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, an independent third party pricing service. If price information is not available from Loan Pricing Corporation, or if the price information is deemed to be unreliable, price information will be obtained from an alternative loan interest pricing service. If no reliable price quotes are available from either the primary or alternative pricing service, broker quotes will be solicited. Event-linked bonds or catastrophe bonds are valued at the bid price obtained from an independent third party pricing service. Other insurance-linked securities (including sidecars, collateralized reinsurance and industry loss warranties) may be valued at the bid price obtained from an independent pricing service, or through a third party using a pricing matrix, insurance industry valuation models, or other fair value methods or techniques to provide an estimated value of the instrument. 62 Pioneer Floating Rate Fund | Annual Report | 10/31/18 Equity securities that have traded on an exchange are valued by using 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 or, if both last bid and asked prices are not available, at the last quoted bid price. Last sale and bid and asked prices are provided by independent third party pricing services. In the case of equity securities not traded on an exchange, prices are typically determined by independent third party pricing services using a variety of techniques and methods. The value of foreign securities is translated into U.S. dollars based on foreign currency exchange rate quotations supplied by a third party pricing source. Trading in non-U.S. equity 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. The Fund may use a fair value model developed by an independent pricing service to value non-U.S. equity securities. Forward foreign currency exchange contracts are valued daily using the foreign exchange rate or, for longer term forward contract positions, the spot currency rate and the forward points on a daily basis, in each case provided by a third party pricing service. Contracts whose forward settlement date falls between two quoted days are valued by interpolation. Swap contracts, including interest rate swaps, caps and floors (other than centrally cleared swap contracts) are valued at the dealer quotations obtained from reputable International Swap Dealers Association members. Centrally cleared swaps are valued at the daily settlement price provided by the central clearing counterparty. Shares of open-end registered investment companies (including money market mutual funds) are valued at such funds' net asset value. Shares of exchange-listed closed-end funds are valued by using the last sale price on the principal exchange where they are traded. Repurchase agreements are valued at par. Cash may include overnight time deposits at approved financial institutions. Securities or loan interests for which independent pricing services or broker-dealers are unable to supply prices or for which market prices and/or quotations are not readily available or are considered to be unreliable are valued by a fair valuation team comprised of certain personnel of the Adviser pursuant to procedures adopted by the Fund's Board of Trustees. The Adviser's fair valuation team uses fair value methods approved by the Valuation Committee of the Board of Trustees. The Adviser's fair valuation Pioneer Floating Rate Fund | Annual Report | 10/31/18 63 team is responsible for monitoring developments that may impact fair valued securities and for discussing and assessing fair values on an ongoing basis, and at least quarterly, with the Valuation Committee of the Board of Trustees. 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. The Fund may use fair value methods if it is determined that a significant event has occurred after the close of the exchange or market on which the security trades and prior to the determination of the Fund's net asset value. Examples of a significant event might include political or economic news, corporate restructurings, natural disasters, terrorist activity or trading halts. Thus, the valuation of the Fund's securities may differ significantly from exchange prices, and such differences could be material. At October 31, 2018, one security was valued using fair value methods (in addition to securities valued using prices supplied by independent pricing services, broker-dealers or using a third party insurance pricing model) representing 0.01% of net assets. The value of this fair valued security was $113,724. B. Investment Income and Transactions 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 and net of income accrued on defaulted securities. Interest and dividend income payable by delivery of additional shares is reclassified as PIK (payment-in-kind) income upon receipt and is included in interest and dividend income, respectively. 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 purchase prices of 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. Security transactions are recorded as of trade date. Gains and losses on sales of investments are calculated on the identified cost method for both financial reporting and federal income tax purposes. 64 Pioneer Floating Rate Fund | Annual Report | 10/31/18 C. 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 on the Statement of Operations from the effects of changes in the market prices of those securities, but are included with the net realized and unrealized gain or loss on investments. 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 net taxable income and net realized capital gains, if any, to its shareowners. Therefore, no provision for federal income taxes is required. As of October 31, 2018, the Fund did not accrue any interest or penalties with respect to uncertain tax positions, which, if applicable, would be recorded as an income tax expense on the Statement of Operations. Tax returns filed within the prior three years remain subject to examination by federal and state tax authorities. The amount and character of income and capital gain distributions to shareowners are determined in accordance with federal income tax rules, which may differ from U.S. GAAP. Distributions in excess of net investment income or net realized gains are temporary over distributions for financial statement purposes resulting from differences in the recognition or classification of income or distributions for financial statement and tax purposes. Capital accounts within the financial statements are adjusted for permanent book/tax differences to reflect tax character, but are not adjusted for temporary differences. At October 31, 2018, the Fund was permitted to carry forward $1,652,256 of short-term capital losses and $19,074,878 of long-term capital losses without limitation. Additionally, at October 31, 2018, the Fund had a net capital loss carryforward of $574,533, which will expire in 2019 if not utilized. Since unlimited losses are required to be used first, loss carryforwards that are subject to expiration may be more likely to expire unused. Pioneer Floating Rate Fund | Annual Report | 10/31/18 65 The tax character of distributions paid during the years ended October 31, 2018 and October 31, 2017, were as follows: --------------------------------------------------------------------------- 2018 2017 --------------------------------------------------------------------------- Distributions paid from: Ordinary income $36,272,854 $30,430,429 --------------------------------------------------------------------------- Total $36,272,854 $30,430,429 =========================================================================== The following shows the components of distributable earnings on a federal income tax basis at October 31, 2018: --------------------------------------------------------------------------- 2018 --------------------------------------------------------------------------- Distributable earnings: Undistributed ordinary income $ 2,628,633 Capital loss carryforward (21,301,667) Dividend payable (389,999) Net unrealized depreciation (2,704,482) --------------------------------------------------------------------------- Total $(21,767,515) =========================================================================== The difference between book basis and tax basis unrealized appreciation is attributable to the tax deferral of losses on wash sales, the mark to market of swap contracts, the tax treatment of premium and amortization, adjustments relating to catastrophe bonds, the tax adjustments relating to credit default swaps, preferred stocks and other holdings. E. Fund Shares The Fund records sales and repurchases of its shares as of trade date. The Distributor earned $13,285 in underwriting commissions on the sale of Class A shares during the year ended October 31, 2018. 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 Fund's transfer agent 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). 66 Pioneer Floating Rate Fund | Annual Report | 10/31/18 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 The value of securities held by the Fund may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic, political or regulatory conditions, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. In the past several years, financial markets have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. These conditions may continue, recur, worsen or spread. 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 investments in foreign markets and countries with limited developing markets may subject the Fund to a greater degree of risk than investments in a developed market. These risks include disruptive political or economic conditions and the imposition of adverse governmental laws or currency exchange restrictions. Interest rates in the U.S. have been historically low and have begun to rise, so the Fund faces a heightened risk that interest rates may continue to rise. A general rise in interest rates could adversely affect the price and liquidity of fixed-income securities and could also result in increased redemptions from the Fund. The Fund invests in below investment grade (high yield) debt securities and preferred stocks. Some of these high yield securities may be convertible into equity securities of the issuer. Debt securities rated below investment grade are commonly referred to as "junk bonds" and are considered speculative. These securities involve greater risk of loss, are subject to greater price volatility, and are less liquid, especially during periods of economic uncertainty or change, than higher rated debt securities. With the increased use of technologies such as the Internet to conduct business, the Fund is susceptible to operational, information security and related risks. While the Fund's Adviser has established business continuity Pioneer Floating Rate Fund | Annual Report | 10/31/18 67 plans in the event of, and risk management systems to prevent, limit or mitigate, such cyber-attacks, there are inherent limitations in such plans and systems including the possibility that certain risks have not been identified. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund such as Brown Brothers Harriman & Co., the Fund's custodian and accounting agent, and DST Asset Manager Solutions, Inc., the Fund's transfer agent. In addition, many beneficial owners of Fund shares hold them through accounts at broker- dealers, retirement platforms and other financial market participants over which neither the Fund nor Amundi Pioneer exercises control. Each of these may in turn rely on service providers to them, which are also subject to the risk of cyber-attacks. Cybersecurity failures or breaches at Amundi Pioneer or the Fund's service providers or intermediaries have the ability to cause disruptions and impact business operations, potentially resulting in financial losses, interference with the Fund's ability to calculate its net asset value, impediments to trading, the inability of Fund shareowners to effect share purchases, redemptions or exchanges or receive distributions, loss of or unauthorized access to private shareowners information and violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, or additional compliance costs. Such costs and losses may not be covered under any insurance. In addition, maintaining vigilance against cyber-attacks may involve substantial costs over time, and system enhancements may themselves be subject to cyber-attacks. 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. Insurance-Linked Securities ("ILS") The Fund invests in event-linked bonds and other ILS. The Fund could lose a portion or all of the principal it has invested in an ILS, and the right to additional interest payments with respect to the security, upon the occurrence of one or more trigger events, as defined within the terms of an insurance-linked security. Trigger events, generally, are hurricanes, earthquakes, or other natural events of a specific size or magnitude that occur in a designated geographic region during a specified time period, and/or that involve losses or other metrics that exceed a specific amount. There is no way to accurately predict whether a trigger event will occur and, accordingly, ILS carry significant risk. The Fund is entitled to receive principal and interest payments so long as no trigger event occurs of the description and magnitude specified by the instrument. In addition to the specified trigger events, ILS may expose the Fund to other risks, including but not limited to issuer (credit) default, adverse regulatory or jurisdictional interpretations and adverse tax consequences. 68 Pioneer Floating Rate Fund | Annual Report | 10/31/18 The Fund's investments in ILS may include special purpose vehicles ("SPVs") or similar instruments structured to comprise a portion of a reinsurer's catastrophe-oriented business, known as quota share instruments (sometimes referred to as reinsurance sidecars), or to provide reinsurance relating to specific risks to insurance or reinsurance companies through a collateralized instrument, known as collateralized reinsurance. Structured reinsurance investments also may include industry loss warranties ("ILWs"). A traditional ILW takes the form of a bilateral reinsurance contract, but there are also products that take the form of derivatives, collateralized structures, or exchange-traded instruments. Where the ILS are based on the performance of underlying reinsurance contracts, the Fund has limited transparency into the individual underlying contracts, and therefore must rely upon the risk assessment and sound underwriting practices of the issuer. Accordingly, it may be more difficult for the Adviser to fully evaluate the underlying risk profile of the Fund's structured reinsurance investments, and therefore the Fund's assets are placed at greater risk of loss than if the Adviser had more complete information. Structured reinsurance instruments generally will be considered illiquid securities by the Fund. These securities may be difficult to purchase, sell or unwind. Illiquid securities also may be difficult to value. If the Fund is forced to sell an illiquid asset, the Fund may be forced to sell at a loss. Additionally, the Fund may gain exposure to ILS by investing in a closed end interval fund, Pioneer ILS Interval Fund, an affiliate of the Adviser. I. Repurchase Agreements Repurchase agreements are arrangements under which the Fund purchases securities from a broker-dealer or a bank, called the counterparty, upon the agreement of the counterparty to repurchase the securities from the Fund at a later date, and at a specific price, which is typically higher than the purchase price paid by the Fund. The securities purchased serve as the Fund's collateral for the obligation of the counterparty to repurchase the securities. The value of the 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 sub-custodian of the Fund. The Adviser is responsible for determining that the value of the collateral remains at least equal to the repurchase price. In the event of a default by the counterparty, the Fund is entitled to sell the securities, but the Fund may not be able to sell them for the price at which they were purchased, thus causing a loss to the Fund. Additionally, if the counterparty becomes insolvent, there is some risk that the Fund will not have a right to the securities, or the immediate right to sell the securities. Pioneer Floating Rate Fund | Annual Report | 10/31/18 69 As of and for the year ended October 31, 2018, the Fund had no open repurchase agreements. J. Forward Foreign Currency Contracts The Fund may enter into forward foreign currency contracts ("contracts") for the purchase or sale of a specific foreign currency at a fixed price on a future date. All contracts are marked to market daily at the applicable exchange rates, and any resulting unrealized appreciation or depreciation is recorded in the Fund's financial statements. The Fund records realized gains and losses at the time a contract 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). At October 31, 2018, the Fund had entered into various forward foreign currency contracts that obligated 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. The average market value of forward foreign currency contracts open during the year ended October 31, 2018, was $(2,008,502). Forward foreign currency contracts outstanding at October 31, 2018, are listed in the Schedule of Investments. K. Credit Default Swap Contracts A credit default swap is a contract between a buyer of protection and a seller of protection against a pre-defined credit event or an underlying reference obligation, which may be a single security or a basket or index of securities. The Fund may buy or sell credit default swap contracts to seek to increase the Fund's income, or to attempt to hedge the risk of default on portfolio securities. A credit default swap index is used to hedge risk or take a position on a basket of credit entities or indices. As 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 seller would be the notional value of the credit default swaps outstanding. If no default occurs, the Fund would 70 Pioneer Floating Rate Fund | Annual Report | 10/31/18 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 referenced above. As a buyer of protection, the Fund makes an upfront or periodic payment to the protection seller in exchange for the right to receive a contingent payment. An upfront payment made by the Fund, as the protection buyer, is recorded within the "Swap contracts, at value" line item on the Statement of Assets and Liabilities. Periodic payments received or paid by the Fund are recorded as realized gains or losses on the Statement of Operations. Credit default swap contracts are marked-to-market daily using valuations supplied by independent sources and the change in value, if any, is recorded within the "Swap contracts, at value" line item on the Statement of Assets and Liabilities. 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 on the Statement of Operations. 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. In addition, obligations under sell protection credit default swaps may be partially offset by net amounts received from settlement of buy protection credit default swaps entered into by the Fund for the same reference obligation with the same counterparty. Certain swap contracts that are cleared through a central clearinghouse are referred to as centrally cleared swaps. All payments made or received by the Fund are pursuant to a centrally cleared swap contract with the central clearing party rather than the original counterparty. Upon entering into a centrally cleared swap contract, the Fund is required to make an initial margin deposit, either in cash or in securities. The daily change in value on open centrally cleared contracts is recorded as "Variation margin for centrally cleared swaps" on the Statement of Assets and Liabilities. Cash received from or paid to the broker related to previous margin movement is held in a segregated account at the broker and is recorded as either "Due from broker for swaps" or "Due to broker for swaps" on the Statement of Assets and Pioneer Floating Rate Fund | Annual Report | 10/31/18 71 Liabilities. The amount of cash deposited with a broker as collateral at October 31, 2018, is recorded as "Swaps collateral" on the Statement of Assets and Liabilities. The average market value of credit default swap contracts open during the year ended October 31, 2018 was $798,222. Open credit default swap contracts at October 31, 2018 are listed in the Schedule of Investments. 2. Management Agreement The Adviser manages the Fund's portfolio. Effective October 1, 2018, Management fees are calculated daily at the annual rate of 0.60% of the Fund's average daily net assets up to $500 million, 0.55% of the next $1.5 billion of the Fund's average daily net assets, and 0.50% of the Fund's average daily net assets over $2 billion. Prior to August 1, 2018, Management fees were calculated daily at the annual rate of 0.60% of the Fund's average daily net assets up to $500 million and 0.55% on assets over $500 million. For the year ended October 31, 2018, the effective management fee (excluding waivers and/or assumption of expenses) was equivalent to 0.58% of the Fund's average daily net assets. The Adviser has contractually agreed to limit ordinary operating expenses (ordinary operating expenses means all fund expenses other than extraordinary expenses, such as litigation, taxes, brokerage commissions and acquired fund fees and expenses) of the Fund to the extent required to reduce Fund expenses to 0.70% of the average daily net assets attributable to Class Y shares. Fees waived and expenses reimbursed during the year ended October 31, 2018, are reflected on the Statement of Operations. These expense limitations are in effect through March 1, 2019. There can be no assurance that the Adviser will extend the expense limitation agreement for a class of shares beyond the date referred to above. In addition, under the management and administration agreements, certain other services and costs, including accounting, regulatory reporting and insurance premiums, are paid by the Fund as administrative reimbursements. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $76,363 in management fees, administrative costs and certain other reimbursements payable to the Adviser at October 31, 2018. 3. Transfer Agent DST Asset Manager Solutions, Inc. serves as the transfer agent to the Fund at negotiated rates. Transfer agent fees and payables shown on the Statement of Operations and the Statement of Assets and Liabilities, respectively, include sub-transfer agent expenses incurred through the Fund's omnibus relationship contracts. 72 Pioneer Floating Rate Fund | Annual Report | 10/31/18 In addition, the Fund reimbursed the transfer agent for out-of-pocket expenses incurred by the transfer agent related to shareowner communications activities such as proxy and statement mailings, and outgoing phone calls. For the year ended October 31, 2018, such out-of-pocket expenses by class of shares were as follows: -------------------------------------------------------------------------------- Shareowner Communications -------------------------------------------------------------------------------- Class A $ 7,410 Class Y 30,616 -------------------------------------------------------------------------------- Total $38,026 ================================================================================ 4. Distribution Plan The Fund has adopted a distribution plan (the "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 the Distributor 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 the Distributor 1.00% of the average daily net assets attributable to Class C shares. The fee for Class C shares consists of a 0.25% service fee and a 0.75% distribution fee paid as compensation for personal services and/or account maintenance services or distribution services with regard to Class C shares. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $14,836 in distribution fees payable to the Distributor at October 31, 2018. 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 12 months 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 the Distributor. For the year ended October 31, 2018, CDSCs in the amount of $9,551 were paid to the Distributor. 5. 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. Up until July 31, 2018, the Fund participated in a credit facility that was in the Pioneer Floating Rate Fund | Annual Report | 10/31/18 73 amount of $195 million. Effective August 1, 2018, the Fund participates in a credit facility that is in the amount of 250 million. Under such credit facility, depending on the type of loan, interest on borrowings is payable at the London Interbank Offered Rate ("LIBOR") plus 0.90% on an annualized basis, or the Alternate Base Rate, which is the greater of (a) the facility's administrative agent's daily announced prime rate on the borrowing date, (b) 2% plus the Federal Funds Rate on the borrowing date, or (c) 2% plus the overnight Eurodollar 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 year ended October 31, 2018, the Fund had no borrowings under the credit facility. 6. Master Netting Agreements The Fund has entered into an International Swaps and Derivatives Association, Inc. Master Agreement ("ISDA Master Agreement") or similar agreement with substantially all its derivative counterparties. An ISDA Master Agreement is a bilateral agreement between the Fund and a counterparty that governs the trading of certain Over the Counter ("OTC") derivatives and typically contains, among other things, close-out and set-off provisions which apply upon the occurrence of an event of default and/or a termination event as defined under the relevant ISDA Master Agreement. The ISDA Master Agreement may also give a party the right to terminate all transactions traded under such agreement if, among other things, there is deterioration in the credit quality of the other party. Upon an event of default or a termination of the ISDA Master Agreement, the non-defaulting party has the right to close out all transactions under such agreement and to net amounts owed under each transaction to determine one net amount payable by one party to the other. The right to close out and net payments across all transactions under the ISDA Master Agreement could result in a reduction of the Fund's credit risk to its counterparty equal to any amounts payable by the Fund under the applicable transactions, if any. However, the Fund's right to setoff may be restricted or prohibited by the bankruptcy or insolvency laws of the particular jurisdiction to which each specific ISDA of each counterparty is subject. The collateral requirements for derivatives transactions under an ISDA Master Agreement are governed by a credit support annex to the ISDA Master Agreement. Collateral requirements are generally determined at the close of business each day and are typically based on changes in market values for each transaction under an ISDA Master Agreement and netted into one amount for such agreement. Generally, the amount of collateral due from or to a counterparty is subject to threshold (a "minimum transfer amount") before a transfer is required, which may vary by counterparty. Collateral pledged for 74 Pioneer Floating Rate Fund | Annual Report | 10/31/18 the benefit of the Fund and/or counterparty is held in segregated accounts by the Fund's custodian and cannot be sold, re-pledged, assigned or otherwise used while pledged. Cash that has been segregated to cover the Fund's collateral obligations, if any, will be reported separately on the Statement of Assets and Liabilities as "Forwards collateral" and/or "Swaps collateral". Securities pledged by the Fund as collateral, if any, are identified as such in the Schedule of Investments. Financial instruments subject to an enforceable master netting agreement such as an ISDA Master Agreement have been offset on the Statement of Assets and Liabilities. The following chart shows gross assets of the Fund as of October 31, 2018. -------------------------------------------------------------------------------------------- Derivative Assets Subject to Derivatives Non-Cash Cash Net Amount Master Netting Available Collateral Collateral of Derivative Counterparty Agreement for Offset Received (a) Received (a) Assets (b) -------------------------------------------------------------------------------------------- JPMorgan Chase Bank NA $14,211 $ -- $ -- $ -- $14,211 -------------------------------------------------------------------------------------------- Total $14,211 $ -- $ -- $ -- $14,211 ============================================================================================ (a) The amount presented here may be less than the total amount of collateral received/pledged as the net amount of derivative assets and liabilities cannot be less than $0. (b) Represents the net amount due from the counterparty in the event of default. 7. Additional Disclosures about Derivative Instruments and Hedging Activities The Fund's use of derivatives may enhance or mitigate the Fund's exposure to the following risks: Interest rate risk relates to the fluctuations in the value of interest-bearing securities due to changes in the prevailing levels of market interest rates. Credit risk relates to the ability of the issuer of a financial instrument to make further principal or interest payments on an obligation or commitment that it has to the Fund. Foreign exchange rate risk relates to fluctuations in the value of an asset or liability due to changes in currency exchange rates. Equity risk relates to the fluctuations in the value of financial instruments as a result of changes in market prices (other than those arising from interest rate risk or foreign exchange rate risk), whether caused by factors specific to an individual investment, its issuer, or all factors affecting all instruments traded in a market or market segment. Pioneer Floating Rate Fund | Annual Report | 10/31/18 75 Commodity risk relates to the risk that the value of a commodity or commodity index will fluctuate based on increases or decreases in the commodities market and factors specific to a particular industry or commodity. The fair value of open derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) by risk exposure at October 31, 2018 was as follows: ----------------------------------------------------------------------------------- Statement of Assets and Liabilities Foreign Interest Credit Exchange Equity Commodity Rate Risk Risk Rate Risk Risk Risk ----------------------------------------------------------------------------------- Assets Unrealized appreciation on forward foreign currency contracts $ -- $ -- $ 14,211 $ -- $ -- Swap contracts, at value -- 725,632 -- -- -- ----------------------------------------------------------------------------------- Total Value $ -- $ 725,632 $ 14,211 $ -- $ -- =================================================================================== The effect of derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) on the Statement of Operations by risk exposure at October 31, 2018, was as follows: ----------------------------------------------------------------------------------- Statement of Operations Foreign Interest Credit Exchange Equity Commodity Rate Risk Risk Rate Risk Risk Risk ----------------------------------------------------------------------------------- Net realized gain (loss) on: Forward foreign currency contracts $ -- $ -- $ 228,862 $ -- $ -- Swap contracts -- 713,659 -- -- -- ----------------------------------------------------------------------------------- Total Value $ -- $ 713,659 $ 228,862 $ -- $ -- =================================================================================== Change in net unrealized appreciation (depreciation) on: Forward foreign currency contracts $ -- $ $ 14,211 $ -- $ -- Swap contracts -- (477,987) -- -- ----------------------------------------------------------------------------------- Total Value $ -- $ (477,987) $ 14,211 $ -- $ -- =================================================================================== 76 Pioneer Floating Rate Fund | Annual Report | 10/31/18 8. Unfunded Loan Commitments The Fund may enter into unfunded loan commitments. Unfunded loan commitments may be partially or wholly unfunded. During the contractual period, the Fund is obliged to provide funding to the borrower upon demand. A fee is earned by the Fund on the unfunded commitment and is recorded as interest income on the Statement of Operations. As of October 31, 2018, the Fund had the following unfunded loan commitments outstanding: ----------------------------------------------------------------------------------- Unrealized Loan Principal Cost Value Appreciation ----------------------------------------------------------------------------------- Access CIG, LLC $ 127,410 $ 126,825 $ 128,000 $1,175 Globallogic Holdings Inc. 150,000 149,276 151,219 1,943 NMN Holdings III Corp. 306,000 305,235 306,765 1,530 Universal Health Services Inc. 1,000,000 1,000,000 1,005,000 5,000 ----------------------------------------------------------------------------------- Total Value $1,583,410 $1,581,336 $1,590,984 $9,648 =================================================================================== Pioneer Floating Rate Fund | Annual Report | 10/31/18 77 Report of Independent Registered Public Accounting Firm To the Board of Trustees of Pioneer Series Trust VI and the Shareholders of Pioneer Floating Rate Fund: -------------------------------------------------------------------------------- Opinion on the Financial Statements We have audited the accompanying statement of assets and liabilities, including the schedule of investments, of Pioneer Floating Rate Fund (the "Fund") (one of the funds constituting Pioneer Series Trust VI (the "Trust")) as of October 31, 2018, and the related statements of operations, changes in net assets and the financial highlights for the year then ended and the related notes, and the statement of changes in net assets and financial highlights for the year ended October 31, 2017 (collectively referred to as the "financial statements"). The financial highlights for periods ended October 31, 2014, October 31, 2015 and October 31, 2016 were audited by another independent registered public accounting firm whose report, dated December 23, 2016, expressed an unqualified opinion on those financial highlights. In our opinion, the financial statements present fairly, in all material respects, the financial position of the Fund at October 31, 2018, the results of its operations, the changes in its net assets, and the financial highlights for the year ended, and the statement of changes in net assets and financial highlights for the year ended October 31, 2017, in conformity with U.S. generally accepted accounting principles. Basis for Opinion These financial statements are the responsibility of the Fund's management. Our responsibility is to express an opinion on the Fund's financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) ("PCAOB") and are required to be independent with respect to the Fund in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB. We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Fund is not required to have, nor were we engaged to perform, an audit of the Fund's internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting, but not for the purpose of expressing an opinion on the effectiveness of the Fund's internal control over financial reporting. Accordingly, we express no such opinion. 78 Pioneer Floating Rate Fund | Annual Report | 10/31/18 Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our procedures included confirmation of securities owned as of October 31, 2018, by correspondence with the custodian and brokers. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion. /s/ Ernst & Young LLP We have served as the Fund's auditor since 2017. Boston, Massachusetts December 21, 2018 Pioneer Floating Rate Fund | Annual Report | 10/31/18 79 ADDITIONAL INFORMATION (unaudited) Qualified interest income is exempt from nonresident alien (NRA) tax withholding. The percentage of the Fund's ordinary income distributions derived from qualified interest income was 98.21%. Change in Independent Registered Public Accounting Firm Prior to July 3, 2017 Pioneer Investment Management, Inc. (the "Adviser"), the Fund's investment adviser, was an indirect, wholly owned subsidiary of UniCredit S.p.A. ("UniCredit"). On that date, UniCredit completed the sale of its Pioneer Investments business, which includes the Adviser, to Amundi (the "Transaction"). As a result of the Transaction, the Adviser became an indirect, wholly owned subsidiary of Amundi. Amundi is controlled by Credit Agricole S.A. Amundi is headquartered in Paris, France, and, as of September 30, 2016, had more than $1.1 trillion in assets under management worldwide. Deloitte & Touche LLP ("D&T"), the Fund's previous independent registered public accounting firm, informed the Audit Committee and the Board that it would no longer be independent with respect to the Fund upon the completion of the Transaction as a result of certain services being provided to Amundi and Credit Agricole, and, accordingly, that it intended to resign as the Fund's independent registered public accounting firm upon the completion of the Transaction. D&T's resignation was effective on July 3, 2017, when the Transaction was completed. During the periods as to which D&T has served as the Fund's independent registered public accounting firm, D&T's reports on the Fund's financial statements have not contained an adverse opinion or disclaimer of opinion and have not been qualified or modified as to uncertainty, audit scope or accounting principles. Further, there have been no disagreements with D&T on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure, which, if not resolved to the satisfaction of D&T, would have caused D&T to make reference to the subject matter of the disagreement in connection with its report on the financial statements. In addition, there have been no reportable events of the kind described in Item 304(a)(1)(v) of Regulation S-K under the Securities Exchange Act of 1934. Effective immediately following the completion of the Transaction on July 3, 2017, the Board, acting upon the recommendation of the Audit Committee, engaged an independent registered public accounting firm, Ernst & Young LLP ("EY"). 80 Pioneer Floating Rate Fund | Annual Report | 10/31/18 Prior to its engagement, EY had advised the Fund's Audit Committee that EY had identified the following matters, in each case relating to services rendered by other member firms of Ernst & Young Global Limited, all of which are located outside the United States, to UniCredit and certain of its subsidiaries during the period commencing July 1, 2016, that it determined to be inconsistent with the auditor independence rules set forth by the Securities and Exchange Commission ("SEC"): (a) project management support services to UniCredit in the Czech Republic, Germany, Italy, Serbia and Slovenia in relation to twenty-two projects, that were determined to be inconsistent with Rule 2-01(c)(4)(vi) of Regulation S-X (management functions); (b) two engagements for UniCredit in Italy where fees were contingent/success based and that were determined to be inconsistent with Rule 2-01(c)(5) of Regulation S-X (contingent fees); (c) four engagements where legal and expert services were provided to UniCredit in the Czech Republic and Germany, and twenty engagements where the legal advisory services were provided to UniCredit in Austria, Czech Republic, Italy and Poland, that were determined to be inconsistent with Rule 2-01(c)(4)(ix) and (x) of Regulation S-X (legal and expert services); and (d) two engagements for UniCredit in Italy involving assistance in the sale of certain assets, that were determined to be inconsistent with Rule 2-01(c)(4)(viii) of Regulation S-X (broker-dealer, investment adviser or investment banking services). None of the foregoing services involved the Fund, any of the other funds in the Pioneer Family of Funds or any other Pioneer entity sold by UniCredit in the Transaction. EY advised the Audit Committee that it had considered the matters described above and had concluded that such matters would not impair EY's ability to exercise objective and impartial judgment in connection with the audits of the financial statements of the Fund under the SEC and Public Company Accounting Oversight Board independence rules, and that a reasonable investor with knowledge of all relevant facts and circumstances would reach the same conclusion. Management and the Audit Committee considered these matters and discussed the matters with EY and, based upon EY's description of the matters and statements made by EY, Management and the Audit Committee believe that EY will be capable of exercising objective and impartial judgment in connection with the audits of the financial statements of the Fund, and Management further believes that a reasonable investor with knowledge of all relevant facts and circumstances would reach the same conclusion. Pioneer Floating Rate Fund | Annual Report | 10/31/18 81 Approval of Investment Management Agreement Amundi Pioneer Asset Management, Inc. ("APAM") serves as the investment adviser to Pioneer Floating Rate Fund (the "Fund") pursuant to an investment management agreement between APAM and the Fund. In order for APAM to remain the investment adviser of the Fund, the Trustees of the Fund must determine annually whether to renew the investment management agreement for the Fund. The contract review process began in January 2018 as the Trustees of the Fund agreed on, among other things, an overall approach and timeline for the process. Contract review materials were provided to the Trustees in March 2018, July 2018 and September 2018. In addition, the Trustees reviewed and discussed the Fund's performance at regularly scheduled meetings throughout the year, and took into account other information related to the Fund provided to the Trustees at regularly scheduled meetings, in connection with the review of the Fund's investment management agreement. In March 2018, the Trustees, among other things, discussed the memorandum provided by Fund counsel that summarized the legal standards and other considerations that are relevant to the Trustees in their deliberations regarding the renewal of the investment management agreement, and reviewed and discussed the qualifications of the investment management teams for the Fund, as well as the level of investment by the Fund's portfolio managers in the Fund. In July 2018, the Trustees, among other things, reviewed the Fund's management fees and total expense ratios, the financial statements of APAM and its parent companies, profitability analyses provided by APAM, and analyses from APAM as to possible economies of scale. The Trustees also reviewed the profitability of the institutional business of APAM and APAM's affiliate, Amundi Pioneer Institutional Asset Management, Inc. ("APIAM" and, together with APAM, "Amundi Pioneer"), as compared to that of APAM's fund management business, and considered the differences between the fees and expenses of the Fund and the fees and expenses of APAM's and APIAM's institutional accounts, as well as the different services provided by APAM to the Fund and by APAM and APIAM to the institutional accounts. The Trustees further considered contract review materials, including additional materials received in response to the Trustees' request, in September 2018. At a meeting held on September 18, 2018, based on their evaluation of the information provided by APAM and third parties, the Trustees of the Fund, including the Independent Trustees voting separately, unanimously approved the renewal of the investment management agreement for another year. In 82 Pioneer Floating Rate Fund | Annual Report | 10/31/18 approving the renewal of the investment management agreement, the Trustees considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the renewal of the agreement. Nature, Extent and Quality of Services The Trustees considered the nature, extent and quality of the services that had been provided by APAM to the Fund, taking into account the investment objective and strategy of the Fund. The Trustees also reviewed APAM's investment approach for the Fund and its research process. The Trustees considered the resources of APAM and the personnel of APAM who provide investment management services to the Fund. They also reviewed the amount of non-Fund assets managed by the portfolio managers of the Fund. They considered the non-investment resources and personnel of APAM that are involved in APAM's services to the Fund, including APAM's compliance, risk management, and legal resources and personnel. The Trustees noted the substantial attention and high priority given by APAM's senior management to the Pioneer Fund complex. The Trustees considered that APAM supervises and monitors the performance of the Fund's service providers and provides the Fund with personnel (including Fund officers) and other resources that are necessary for the Fund's business management and operations. The Trustees also considered that, as administrator, APAM is responsible for the administration of the Fund's business and other affairs. The Trustees considered the fees paid to APAM for the provision of administration services. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that had been provided by APAM to the Fund were satisfactory and consistent with the terms of the investment management agreement. Performance of the Fund In considering the Fund's performance, the Trustees regularly review and discuss throughout the year data prepared by APAM and information comparing the Fund's performance with the performance of its peer group of funds, as classified by Morningstar, Inc. (Morningstar), and the performance of the Fund's benchmark index. They also discuss the Fund's performance with APAM on a regular basis. The Trustees' regular reviews and discussions were factored into the Trustees' deliberations concerning the renewal of the investment management agreement. Pioneer Floating Rate Fund | Annual Report | 10/31/18 83 Management Fee and Expenses The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees of its peer group of funds as classified by Morningstar and also to the expense ratios of a peer group of funds selected on the basis of criteria determined by the Independent Trustees for this purpose using data provided by Strategic Insight Mutual Fund Research and Consulting, LLC (Strategic Insight), an independent third party. The peer group comparisons referred to below are organized in quintiles. Each quintile represents one-fifth of the peer group. In all peer group comparisons referred to below, first quintile is most favorable to the Fund's shareowners. The Trustees noted that they separately review and consider the impact of the Fund's transfer agency and Fund- and APAM-paid expenses for sub-transfer agency and intermediary arrangements, and that the results of the most recent such review were considered in the consideration of the Fund's expense ratio. The Trustees considered that the Fund's management fee for the most recent fiscal year was in the second quintile relative to the management fees paid by other funds in its Morningstar category for the comparable period. The Trustees also considered the breakpoints in the management fee schedule and the reduced fee rates above certain asset levels. The Trustees considered that the expense ratio of the Fund's Class A shares for the most recent fiscal year was in the third quintile relative to its Strategic Insight peer group for the comparable period. The Trustees considered that the expense ratio of the Fund's Class Y shares for the most recent fiscal year was in the first quintile relative to its Strategic Insight peer group for the comparable period. The Trustees reviewed management fees charged by APAM and APIAM to institutional and other clients, including publicly offered European funds sponsored by APAM's affiliates, unaffiliated U.S. registered investment companies (in a sub-advisory capacity), and unaffiliated foreign and domestic separate accounts. The Trustees also considered APAM's costs in providing services to the Fund and APAM's and APIAM's costs in providing services to the other clients and considered the differences in management fees and profit margins for fund and non-fund services. In evaluating the fees associated with APAM's and APIAM's client accounts, the Trustees took into account the respective demands, resources and complexity associated with the Fund and other client accounts. The Trustees noted that, in some instances, the fee rates for those clients were lower than the management fee for the Fund and considered that, under the investment management agreement with the Fund, APAM performs additional services for the Fund that it does not provide to those other clients or services that are broader in scope, including oversight of the Fund's other service providers and activities related to compliance and the extensive regulatory and tax regimes to which the Fund is subject. The Trustees also considered the entrepreneurial risks associated with APAM's management of the Fund. 84 Pioneer Floating Rate Fund | Annual Report | 10/31/18 The Trustees concluded that the management fee payable by the Fund to APAM was reasonable in relation to the nature and quality of the services provided by APAM. Profitability The Trustees considered information provided by APAM regarding the profitability of APAM with respect to the advisory services provided by APAM to the Fund, including the methodology used by APAM in allocating certain of its costs to the management of the Fund. The Trustees also considered APAM's profit margin in connection with the overall operation of the Fund. They further reviewed the financial results, including the profit margins, realized by APAM and APIAM from non-fund businesses. The Trustees considered APAM's profit margins in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees concluded that APAM's profitability with respect to the management of the Fund was not unreasonable. Economies of Scale The Trustees considered APAM's views relating to economies of scale in connection with the Pioneer Funds as fund assets grow and the extent to which any such economies of scale are shared with the Fund and Fund shareholders. The Trustees noted the breakpoints in the management fee schedule. The Trustees recognize that economies of scale are difficult to identify and quantify, and that, among other factors that may be relevant, are the following: fee levels, expense subsidization, investment by APAM in research and analytical capabilities and APAM's commitment and resource allocation to the Fund. The Trustees noted that profitability also may be an indicator of the availability of any economies of scale, although profitability may vary for other reasons including due to reductions in expenses. The Trustees concluded that economies of scale, if any, were being appropriately shared with the Fund. Other Benefits The Trustees considered the other benefits that APAM enjoys from its relationship with the Fund. The Trustees considered the character and amount of fees paid or to be paid by the Fund, other than under the investment management agreement, for services provided by APAM and its affiliates. The Trustees further considered the revenues and profitability of APAM's businesses other than the Fund business. To the extent applicable, the Trustees also considered the benefits to the Fund and to APAM and its affiliates from the use of "soft" commission dollars generated by the Fund to pay for research and brokerage services. Pioneer Floating Rate Fund | Annual Report | 10/31/18 85 The Trustees considered that Amundi Pioneer is the principal U.S. asset management business of Amundi, which is one of the largest asset managers globally. Amundi's worldwide asset management business manages over $1.7 trillion in assets (including the Pioneer Funds). The Trustees considered that APAM's relationship with Amundi creates potential opportunities for APAM, APIAM and Amundi that derive from APAM's relationships with the Fund, including Amundi's ability to market the services of APAM globally. The Trustees noted that APAM has access to additional research and portfolio management capabilities as a result of its relationship with Amundi and Amundi's enhanced global presence that may contribute to an increase in the resources available to APAM. The Trustees considered that APAM and the Fund receive reciprocal intangible benefits from the relationship, including mutual brand recognition and, for the Fund, direct and indirect access to the resources of a large global asset manager. The Trustees concluded that any such benefits received by APAM as a result of its relationship with the Fund were reasonable. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including the Independent Trustees, concluded that the investment management agreement for the Fund, including the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of the investment management agreement. 86 Pioneer Floating Rate Fund | Annual Report | 10/31/18 Trustees, Officers and Service Providers Investment Adviser Amundi Pioneer Asset Management, Inc. Custodian and Sub-Administrator Brown Brothers Harriman & Co. Independent Registered Public Accounting Firm Ernst & Young LLP Principal Underwriter Amundi Pioneer Distributor, Inc. Legal Counsel Morgan, Lewis & Bockius LLP Shareowner Services and Transfer Agent DST Asset Manager Solutions, 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 www.amundipioneer.com. This information is also available on the Securities and Exchange Commission's web site at www.sec.gov. Trustees and Officers The Fund's Trustees and officers are listed below, together with their principal occupations and other directorships they have held during at least the past five years. Trustees who are interested persons of the Fund within the meaning of the 1940 Act are referred to as Interested Trustees. Trustees who are not interested persons of the Fund are referred to as Independent Trustees. Each of the Trustees serves as a Trustee of each of the 43 U.S. registered investment portfolios for which Amundi Pioneer serves as investment adviser (the "Pioneer Funds"). The address for all Trustees and all officers of the Fund is 60 State Street, Boston, Massachusetts 02109. The Statement of Additional Information of the Fund includes additional information about the Trustees and is available, without charge, upon request, by calling 1-800-225-6292. Pioneer Floating Rate Fund | Annual Report | 10/31/18 87 Independent Trustees ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Position Term of Office and Other Directorships Held With the Fund Length of Service Principal Occupation Held by Trustee ------------------------------------------------------------------------------------------------------------------------------------ Thomas J. Perna (68) Trustee since 2007. Private investor (2004 - 2008 and 2013 - Director, Broadridge Financial Chairman of the Serves until a present); Chairman (2008 - 2013) and Chief Solutions, Inc. (investor Board and Trustee successor trustee is Executive Officer (2008 - 2012), Quadriserv, communications and securities elected or earlier Inc. (technology products for securities lending processing provider for retirement or industry); and Senior Executive Vice President, financial services industry) removal. The Bank of New York (financial and securities (2009 - present); Director, services) (1986 - 2004) Quadriserv, Inc. (2005 - 2013); and Commissioner, New Jersey State Civil Service Commission (2011 - 2015) ------------------------------------------------------------------------------------------------------------------------------------ David R. Bock (74) Trustee since 2007. Managing Partner, Federal City Capital Advisors Director of New York Mortgage Trustee Serves until a (corporate advisory services company) (1997 - Trust(publicly-traded mortgage successor trustee is 2004 and 2008 - present); Interim Chief REIT) (2004 - 2009, 2012 - elected or earlier Executive Officer, Oxford Analytica, Inc. present); Director of The Swiss retirement or (privately held research and consulting company) Helvetia Fund, Inc. (closed- removal. (2010); Executive Vice President and Chief end fund) (2010 - 2017); Financial Officer, I-trax, Inc. (publicly traded Director of Oxford Analytica, health care services company) (2004 - 2007); and Inc. (2008 - 2015); and Executive Vice President and Chief Financial Director of Enterprise Officer, Pedestal Inc. (internet-based mortgage Community Investment, Inc. trading company) (2000 - 2002); Private (privately-held affordable Consultant (1995 - 1997); Managing Director, housing finance company) (1985 Lehman Brothers (1992 - 1995); and Executive, - 2010) The World Bank (1979 - 1992) ------------------------------------------------------------------------------------------------------------------------------------ Benjamin M. Friedman (74) Trustee since 2008. William Joseph Maier Professor of Political Trustee, Mellon Institutional Trustee Serves until a Economy, Harvard University (1972 - present) Funds Investment Trust and successor trustee is Mellon Institutional Funds elected or earlier Master Portfolio (oversaw 17 retirement or portfolios in fund complex) removal. (1989 - 2008) ------------------------------------------------------------------------------------------------------------------------------------ 88 Pioneer Floating Rate Fund | Annual Report | 10/31/18 ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Position Term of Office and Other Directorships Held With the Fund Length of Service Principal Occupation Held by Trustee ------------------------------------------------------------------------------------------------------------------------------------ Margaret B.W. Graham (71) Trustee since 2007. Founding Director, Vice-President and Corporate None Trustee Serves until a Secretary, The Winthrop Group, Inc. (consulting successor trustee is firm) (1982 - present); Desautels Faculty of elected or earlier Management, McGill University (1999 - 2017); and retirement or Manager of Research Operations and removal. Organizational Learning, Xerox PARC, Xerox's advance research center (1990-1994) ------------------------------------------------------------------------------------------------------------------------------------ Lorraine H. Monchak (62) Trustee since 2017. Chief Investment Officer, 1199 SEIU Funds None Trustee (Advisory Trustee (healthcare workers union pension funds) (2001 - from 2014 - 2017) present); Vice President - International Serves until a Investments Group, American International Group, successor trustee is Inc. (insurance company) (1993 - 2001); Vice elected or earlier President - Corporate Finance and Treasury retirement or Group, Citibank, N.A. (1980 - 1986 and 1990 - removal. 1993); Vice President - Asset/Liability Management Group, Federal Farm Funding Corporation (government-sponsored issuer of debt securities) (1988 - 1990); Mortgage Strategies Group, Shearson Lehman Hutton, Inc. (investment bank) (1987 - 1988); and Mortgage Strategies Group, Drexel Burnham Lambert, Ltd. (investment bank) (1986 - 1987) ------------------------------------------------------------------------------------------------------------------------------------ Marguerite A. Piret (70) Trustee since 2007. President and Chief Executive Officer, Newbury Director of New America High Trustee Serves until a Piret Company (investment banking firm) (1981 - Income Fund, Inc. (closed-end successor trustee is present) investment company) (2004 - elected or earlier present); and Member, Board of retirement or Governors, Investment Company removal. Institute (2000 - 2006) ------------------------------------------------------------------------------------------------------------------------------------ Fred J. Ricciardi (71) Trustee since 2014. Consultant (investment company services) (2012 - None Trustee Serves until a present); Executive Vice President, BNY Mellon successor trustee is (financial and investment company services) elected or earlier (1969 - 2012); Director, BNY International retirement or Financing Corp. (financial services) (2002 - removal. 2012); and Director, Mellon Overseas Investment Corp. (financial services) (2009 - 2012) ------------------------------------------------------------------------------------------------------------------------------------ Pioneer Floating Rate Fund | Annual Report | 10/31/18 89 Interested Trustees ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Position Term of Office and Other Directorships Held With the Fund Length of Service Principal Occupation Held by Trustee ------------------------------------------------------------------------------------------------------------------------------------ Lisa M. Jones (56)* Trustee since 2017. Director, CEO and President of Amundi Pioneer None Trustee, President and Serves until a Asset Management USA, Inc. (since September Chief Executive Officer successor trustee is 2014); Director, CEO and President of Amundi elected or earlier Pioneer Asset Management, Inc. (since September retirement or 2014); Director, CEO and President of Amundi removal Pioneer Distributor, Inc. (since September 2014); Director, CEO and President of Amundi Pioneer Institutional Asset Management, Inc. (since September 2014); Chair, Amundi Pioneer Asset Management USA, Inc., Amundi Pioneer Distributor, Inc. and Amundi Pioneer Institutional Asset Management, Inc. (September 2014 - 2018); Managing Director, Morgan Stanley Investment Management (2010 - 2013); and Director of Institutional Business, CEO of International, Eaton Vance Management (2005 - 2010) ------------------------------------------------------------------------------------------------------------------------------------ Kenneth J. Taubes (60)* Trustee since 2014. Director and Executive Vice President (since None Trustee Serves until a 2008) and Chief Investment Officer, U.S. (since successor trustee is 2010) of Amundi Pioneer Asset Management USA, elected or earlier Inc.; Executive Vice President and Chief retirement or Investment Officer, U.S. of Amundi Pioneer removal (since 2008); Executive Vice President of Amundi Pioneer Institutional Asset Management, Inc. (since 2009); and Portfolio Manager of Amundi Pioneer (since 1999) ------------------------------------------------------------------------------------------------------------------------------------ * Ms. Jones and Mr. Taubes are Interested Trustees because they are officers or directors of the Fund's investment adviser and certain of its affiliates. 90 Pioneer Floating Rate Fund | Annual Report | 10/31/18 Fund Officers ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Position Term of Office and Other Directorships Held With the Fund Length of Service Principal Occupation Held by Officer ------------------------------------------------------------------------------------------------------------------------------------ Christopher J. Kelley (53) Since 2007. Serves Vice President and Associate General Counsel of None Secretary and at the discretion of Amundi Pioneer since January 2008; Secretary and Chief Legal Officer the Board Chief Legal Officer of all of the Pioneer Funds since June 2010; Assistant Secretary of all of the Pioneer Funds from September 2003 to May 2010; and Vice President and Senior Counsel of Amundi Pioneer from July 2002 to December 2007 ------------------------------------------------------------------------------------------------------------------------------------ Carol B. Hannigan (57) Since 2010. Serves Fund Governance Director of Amundi Pioneer since None Assistant Secretary at the discretion of December 2006 and Assistant Secretary of all the the Board Pioneer Funds since June 2010; Manager - Fund Governance of Amundi Pioneer from December 2003 to November 2006; and Senior Paralegal of Amundi Pioneer from January 2000 to November 2003 ------------------------------------------------------------------------------------------------------------------------------------ Thomas Reyes (55) Since 2010. Serves Senior Counsel of Amundi Pioneer since May 2013 None Assistant Secretary at the discretion of and Assistant Secretary of all the Pioneer Funds the Board since June 2010; and Counsel of Amundi Pioneer from June 2007 to May 2013 ------------------------------------------------------------------------------------------------------------------------------------ Mark E. Bradley (58) Since 2008. Serves Vice President - Fund Treasury of Amundi None Treasurer and at the discretion of Pioneer; Treasurer of all of the Pioneer Funds Chief Financial and the Board since March 2008; Deputy Treasurer of Amundi Accounting Officer Pioneer from March 2004 to February 2008; and Assistant Treasurer of all of the Pioneer Funds from March 2004 to February 2008 ------------------------------------------------------------------------------------------------------------------------------------ Luis I. Presutti (53) Since 2007. Serves Director - Fund Treasury of Amundi Pioneer; and None Assistant Treasurer at the discretion of Assistant Treasurer of all of the Pioneer Funds the Board ------------------------------------------------------------------------------------------------------------------------------------ Gary Sullivan (60) Since 2007. Serves Senior Manager - Fund Treasury of Amundi None Assistant Treasurer at the discretion of Pioneer; and Assistant Treasurer of all of the the Board Pioneer Funds ------------------------------------------------------------------------------------------------------------------------------------ Pioneer Floating Rate Fund | Annual Report | 10/31/18 91 Fund Officers (continued) ------------------------------------------------------------------------------------------------------------------------------------ Name, Age and Position Term of Office and Other Directorships Held With the Fund Length of Service Principal Occupation Held by Officer ------------------------------------------------------------------------------------------------------------------------------------ David F. Johnson (38) Since 2009. Serves Senior Manager - Fund Treasury of Amundi Pioneer None Assistant Treasurer at the discretion of since November 2008; Assistant Treasurer of all the Board of the Pioneer Funds since January 2009; and Client Service Manager - Institutional Investor Services at State Street Bank from March 2003 to March 2007 ------------------------------------------------------------------------------------------------------------------------------------ John Malone (47) Since 2018. Serves Managing Director, Chief Compliance Officer of None Chief Compliance Officer at the discretion of Amundi Pioneer Asset Management; Amundi Pioneer the Board Institutional Asset Management, Inc.; and the Pioneer Funds since September 2018; and Chief Compliance Officer of Amundi Pioneer Distributor, Inc. since January 2014. ------------------------------------------------------------------------------------------------------------------------------------ Kelly O'Donnell (47) Since 2007. Serves Vice President - Investor Services Group of None Anti-Money Laundering at the discretion of Amundi Pioneer and Anti-Money Laundering Officer Officer the Board of all the Pioneer Funds since 2006 ------------------------------------------------------------------------------------------------------------------------------------ 92 Pioneer Floating Rate Fund | Annual Report | 10/31/18 How to Contact Amundi 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: -------------------------------------------------------------------------------- Amundi Pioneer P.O. Box 55014 Boston, Massachusetts 02205-5014 Our toll-free fax 1-800-225-4240 Our internet e-mail address us.askamundipioneer@amundipioneer.com (for general questions about Amundi Pioneer only) Visit our web site: www.amundipioneer.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. [LOGO] Amundi Pioneer ============== ASSET MANAGEMENT Amundi Pioneer Asset Management, Inc. 60 State Street Boston, MA 02109 www.amundipioneer.com Securities offered through Amundi Pioneer Distributor, Inc. 60 State Street, Boston, MA 02109 Underwriter of Pioneer Mutual Funds, Member SIPC (C) 2018 Amundi Pioneer Asset Management 21401-11-1218 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 12(a)(1), 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. The audit fees for the Trust were $95,000 payable to Ernst & Young LLP for the year ended October 31, 2018 and $95,000 for the year ended October 31, 2017. (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. There were no audit-related services in 2018 or 2017. (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. The tax fees for the Trust were $25,189 payable to Ernst & Young LLP for the year ended October 31, 2018 and $21,630 for the year ended October 31, 2017. (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. There were no other fees in 2018 or 2017. (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 Amudi Pioneer Asset Management, Inc, the audit committee and the independent auditors. The Funds recognize that a Fund's independent auditors: 1) possess knowledge of the Funds, 2) are able to incorporate certain services into the scope of the audit, thereby avoiding redundant work, cost and disruption of Fund personnel and processes, and 3) have expertise that has value to the Funds. As a result, there are situations where it is desirable to use the Fund's independent auditors for services in addition to the annual audit and where the potential for conflicts of interests are minimal. Consequently, this policy, which is intended to comply with Rule 210.2-01(C)(7), sets forth guidelines and procedures to be followed by the Funds when retaining the independent audit firm to perform audit, audit-related tax and other services under those circumstances, while also maintaining independence. Approval of a service in accordance with this policy for a Fund shall also constitute approval for any other Fund whose pre-approval is required pursuant to Rule 210.2-01(c)(7)(ii). In addition to the procedures set forth in this policy, any non-audit services that may be provided consistently with Rule 210.2-01 may be approved by the Audit Committee itself and any pre-approval that may be waived in accordance with Rule 210.2-01(c)(7)(i)(C) is hereby waived. Selection of a Fund's independent auditors and their compensation shall be determined by the Audit Committee and shall not be subject to this policy. SECTION II - POLICY ---------------- -------------------------------- ------------------------------------------------- SERVICE SERVICE CATEGORY DESCRIPTION SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES CATEGORY ---------------- -------------------------------- ------------------------------------------------- I. AUDIT Services that are directly o Accounting research assistance SERVICES related to performing the o SEC consultation, registration independent audit of the Funds statements, and reporting o Tax accrual related matters o Implementation of new accounting standards o Compliance letters (e.g. rating agency letters) o Regulatory reviews and assistance regarding financial matters o Semi-annual reviews (if requested) o Comfort letters for closed end offerings ---------------- -------------------------------- ------------------------------------------------- II. Services which are not o AICPA attest and agreed-upon procedures AUDIT-RELATED prohibited under Rule o Technology control assessments SERVICES 210.2-01(C)(4) (the "Rule") o Financial reporting control assessments and are related extensions of o Enterprise security architecture the audit services support the assessment audit, or use the knowledge/expertise gained from the audit procedures as a foundation to complete the project. In most cases, if the Audit-Related Services are not performed by the Audit firm, the scope of the Audit Services would likely increase. The Services are typically well-defined and governed by accounting professional standards (AICPA, SEC, etc.) ---------------- -------------------------------- ------------------------------------------------- ------------------------------------- ------------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the audit period for all services and related fees pre-approved specific service reported at each regularly subcategories. Approval of the scheduled Audit Committee independent auditors as meeting. auditors for a Fund shall constitute pre approval for these services. ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the fund fiscal year within services and related fees a specified dollar limit (including comparison to for all pre-approved specified dollar limits) specific service subcategories reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limit for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for Audit-Related Services not denoted as "pre-approved", or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------------------ SECTION III - POLICY DETAIL, CONTINUED ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- --------------------------- ----------------------------------------------- III. TAX SERVICES Services which are not o Tax planning and support prohibited by the Rule, o Tax controversy assistance if an officer of the Fund o Tax compliance, tax returns, excise determines that using the tax returns and support Fund's auditor to provide o Tax opinions these services creates significant synergy in the form of efficiency, minimized disruption, or the ability to maintain a desired level of confidentiality. ----------------------- --------------------------- ----------------------------------------------- ------------------------------------- ------------------------- AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------- ------------------------------------- ------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year all such services and within a specified dollar limit related fees 				 (including comparison 			 to specified dollar 			 limits) reported 			 quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for tax services not denoted as pre-approved, or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------- SECTION III - POLICY DETAIL, CONTINUED ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- --------------------------- ----------------------------------------------- IV. OTHER SERVICES Services which are not o Business Risk Management support prohibited by the Rule, o Other control and regulatory A. SYNERGISTIC, if an officer of the Fund compliance projects UNIQUE QUALIFICATIONS determines that using the Fund's auditor to provide these services creates significant synergy in the form of efficiency, minimized disruption, the ability to maintain a desired level of confidentiality, or where the Fund's auditors posses unique or superior qualifications to provide these services, resulting in superior value and results for the Fund. ----------------------- --------------------------- ----------------------------------------------- --------------------------------------- ------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- -------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year within all such services and a specified dollar limit related fees 			 (including comparison 			 to specified dollar 				 limits) reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for "Synergistic" or "Unique Qualifications" Other Services not denoted as pre-approved to the left, or to add a specific service subcategory as "pre-approved" ------------------------------------- -------------------------- SECTION III - POLICY DETAIL, CONTINUED ----------------------- ------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PROHIBITED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- ------------------------- ----------------------------------------------- PROHIBITED SERVICES Services which result 1. Bookkeeping or other services in the auditors losing related to the accounting records or independence status financial statements of the audit under the Rule. client* 2. Financial information systems design and implementation* 3. Appraisal or valuation services, fairness* opinions, or contribution-in-kind reports 4. Actuarial services (i.e., setting actuarial reserves versus actuarial audit work)* 5. Internal audit outsourcing services* 6. Management functions or human resources 7. Broker or dealer, investment advisor, or investment banking services 8. Legal services and expert services unrelated to the audit 9. Any other service that the Public Company Accounting Oversight Board determines, by regulation, is impermissible ----------------------- ------------------------- ----------------------------------------------- ------------------------------------------- ------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------------- ------------------------------ o These services are not to be o A summary of all performed with the exception of the(*) services and related services that may be permitted fees reported at each if they would not be subject to audit regularly scheduled procedures at the audit client (as Audit Committee meeting defined in rule 2-01(f)(4)) level will serve as continual the firm providing the service. confirmation that has 				 not provided any restricted services. ------------------------------------------- ------------------------------ -------------------------------------------------------------------------------- GENERAL AUDIT COMMITTEE APPROVAL POLICY: o For all projects, the officers of the Funds and the Fund's auditors will each make an assessment to determine that any proposed projects will not impair independence. o Potential services will be classified into the four non-restricted service categories and the "Approval of Audit, Audit-Related, Tax and Other Services" Policy above will be applied. Any services outside the specific pre-approved service subcategories set forth above must be specifically approved by the Audit Committee. o At least quarterly, the Audit Committee shall review a report summarizing the services by service category, including fees, provided by the Audit firm as set forth in the above policy. -------------------------------------------------------------------------------- (2) Disclose the percentage of services described in each of paragraphs (b) through (d) of this Item that were approved by the audit committee pursuant to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X. Non-Audit Services Beginning with non-audit service contracts entered into on or after May 6, 2003, the effective date of the new SEC pre-approval rules, the Trust's audit committee is required to pre-approve services to affiliates defined by SEC rules to the extent that the services are determined to have a direct impact on the operations or financial reporting of the Trust. For the years ended October 31 2018 and 2017, there were no services provided to an affiliate that required the Trust's audit committee pre-approval. (f) If greater than 50 percent, disclose the percentage of hours expended on the principal accountants 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 registrants accountant for services rendered to the registrant, and rendered to the registrants 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. The aggregate non-audit fees for the Trust were $25,189 payable to Ernst & Young LLP for the year ended October 31, 2018 and $21,630 for the year ended October 31, 2017. (h) Disclose whether the registrants audit committee of the board of trustees has considered whether the provision of non-audit services that were rendered to the registrants 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 registrant's 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 of Investments in securities of unaffiliated issuers as of the close of the reporting period as set forth in 210.1212 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 registrant's portfolio ("Portfolio Manager"). Also state each Portfolio Manager's 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 registrant's equity securities that is registered by the registrant pursuant to Section 12 of the Exchange Act (15 U.S.C. 781). 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 registrant's board of directors, where those changes were implemented after the registrant last provided disclosure in response to the requirements of Item 407(c)(2)(iv) of Regulation S-R(17 CFR 229.407)(as required by Item 22(b)(15)) 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 registrant's board of directors since the registrant last provided disclosure in response to the requirements of Item 407(c)(2)(iv) of Regulation S-R 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 and principal financials officers, or persons performing similar functions, regarding the effectiveness of the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Act (17 CFR 270.30a-3(c))) as of a date within 90 days of the filing date of the report that includes the disclosure required by this paragraph, based on the evaluation of these controls and procedures required by Rule 30a-3(b) under the Act (17 CFR 270.30(a)-3(b) and Rules 13a-15(b) or 15d-15(b) under the Exchange Act (17 CFR 240.13a-15(b) or 240.15d-15(b)). The registrant's principal executive officer and principal financial officer have concluded that the registrant's disclosure controls and procedures are effective based on the evaluation of these controls and procedures as of a date within 90 days of the filing date of this report. (b) Disclose any change in the registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the Act (17CFR 270.30a-3(d)) that occured during the second fiscal quarter of the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting. 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. Disclosure of Securities Lending Activities for Closed-End Management Investment Companies. (a) If the registrant is a closed-end management investment company, provide the following dollar amounts of income and compensation related to the securities lending activities of the registrant during its most recent fiscal year: N/A (1) Gross income from securities lending activities; N/A (2) All fees and/or compensation for each of the following securities lending activities and related services: any share of revenue generated by the securities lending program paid to the securities lending agent(s) (revenue split); fees paid for cash collateral management services (including fees deducted from a pooled cash collateral reinvestment vehicle) that are not included in the revenue split; administrative fees that are not included in the revenue split; fees for indemnification that are not included in the revenue split; rebates paid to borrowers; and any other fees relating to the securities lending program that are not included in the revenue split, including a description of those other fees; N/A (3) The aggregate fees/compensation disclosed pursuant to paragraph (2); and N/A (4) Net income from securities lending activities (i.e., the dollar amount in paragraph (1) minus the dollar amount in paragraph (3)). If a fee for a service is included in the revenue split, state that the fee is included in the revenue split. N/A (b) If the registrant is a closed-end management investment company, describe the services provided to the registrant by the securities lending agent in the registrants most recent fiscal year. N/A ITEM 13. EXHIBITS. (a) File the exhibits listed below as part of this Form. Letter or number the exhibits in the sequence indicated. (1) 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. (2) A separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2(a) under the Act (17 CFR 270.30a-2(a)) , exactly as set forth below: 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 VI By (Signature and Title)* /s/ Lisa M. Jones Lisa M. Jones, President & Chief Executive Officer Date December 28, 2018 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/ Lisa M. Jones Lisa M. Jones, President & Chief Executive Officer Date December 28, 2018 By (Signature and Title)* /s/ Mark E. Bradley Mark E. Bradley, Treasurer & Chief Accounting & Financial Officer Date December 28, 2018 * Print the name and title of each signing officer under his or her signature.