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 811-07318 Pioneer Series Trust VIII (Exact name of registrant as specified in charter) 60 State Street, Boston, MA 02109 (Address of principal executive offices) (ZIP code) Terrence J. Cullen, Pioneer Investment Management, Inc., 60 State Street, Boston, MA 02109 (Name and address of agent for service) Registrant's telephone number, including area code: (617) 742-7825 Date of fiscal year end: November 30 Date of reporting period: December 1, 2016 through May 31, 2017 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 International Equity Fund -------------------------------------------------------------------------------- Semiannual Report | May 31, 2017 -------------------------------------------------------------------------------- Ticker Symbols: Class A PIIFX Class C PCITX Class Y INVYX [LOGO] Amundi Pioneer ============== ASSET MANAGEMENT visit us: www.amundipioneer.com Table of Contents President's Letter 2 Portfolio Management Discussion 4 Portfolio Summary 9 Prices and Distributions 10 Performance Update 11 Comparing Ongoing Fund Expenses 14 Schedule of Investments 16 Financial Statements 23 Notes to Financial Statements 30 Approval of New and Interim Management Agreements 40 Trustees, Officers and Service Providers 49 Pioneer International Equity Fund | Semiannual Report | 5/31/17 1 President's Letter U.S. markets have continued to generate positive returns during the first several months of 2017, with so-called "risk" assets, such as equities and credit-sensitive bonds, posting solid gains. U.S. equities, as measured by the Standard & Poor's 500 Index, returned slightly more than 6% in the first calendar quarter of the year and more than 3% for the second quarter. Meanwhile, high-yield securities have dominated bond market performance thus far in 2017. The post-election market momentum we witnessed in the U.S. during the final weeks of the fourth quarter of 2016 slowed only when oil prices slumped in March, due to both higher-than-expected inventories and concerns over whether OPEC (Organization of Petroleum Exporting Countries) would continue its supply cuts. Not even the Federal Reserve System's (the Fed's) two rate hikes since March, nor Britain's trigger of Article 50 to begin the "Brexit" process caused any dramatic sell-off of risk assets. In fact, we are encouraged by the more hawkish stance of the Fed with regard to interest rates, in light of our view that current U.S. bond yields do not fairly reflect the prospective levels of economic activity and inflation. We expect the Fed to continue to tighten monetary policy, with at least one more rate hike likely to occur before the end of 2017. While U.S. gross domestic product (GDP) did slow in the first quarter, ending up at 1.4% after revisions, the expectation is for GDP growth to pick-up in the second quarter, with a solid consumer leading the way. It is our view that the U.S. economy may lead all developed nations in 2017, with GDP growth in excess of 2% for the full year, even if proposed tax and regulatory reforms are not passed into law in the near future. We also believe solid domestic employment figures should continue to support consumption and the housing market, and that stronger corporate profits and increased government spending may contribute to economic growth in 2018 and beyond. In addition, as we monitor global Purchasing Manager Indices (PMIs), we note that their numbers are increasing, which suggests that growth in global economies is also improving. (PMIs are used to measure the economic health of the manufacturing sector.) There are, as always, some risks to our outlook. First, the market already has priced in a good deal of the Trump economic reform platform, and that could lead to near-term disappointment if Congressional follow-through does not happen this year. The future of the Affordable Care Act (ACA) is another potential concern, as Congressional leaders have, thus far, failed to generate 2 Pioneer International Equity Fund | Semiannual Report | 5/31/17 enough support to get new health care legislation approved by both houses. However, if a bill is eventually passed that either eliminates or significantly alters the ACA, the new law will undoubtedly have an effect on the health care sector, one of the largest segments of the U.S. economy. Geopolitical risks, of course, remain a potential headwind, given ongoing strife in the Middle East and renewed tensions on the Korean Peninsula. While our current outlook is generally optimistic, conditions can and often do change, and while passive investment strategies may have a place in one's overall portfolio, it is our view that all investment decisions are active choices. Throughout our history, we have believed in the importance of active management. The active decisions to invest in equities or fixed-income securities are made by a team of experienced investment professionals focusing on identifying value across global markets using proprietary research, careful risk management, and a long-term perspective. We believe our shareowners can benefit from the experience and tenure of our investment teams as well as the insights generated from our extensive research process. 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 US Amundi Pioneer Asset Management USA, Inc. May 31, 2017 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 International Equity Fund | Semiannual Report | 5/31/17 3 Portfolio Management Discussion | 5/31/17 Important Note: On July 3, 2017, Amundi acquired Pioneer Investments, a group of asset management companies located throughout the world. Amundi, one of the world's largest asset managers, is headquartered in Paris, France. As a result of the transaction, Pioneer Investment Management, Inc., the Fund's investment adviser, became an indirect wholly owned subsidiary of Amundi and Amundi's wholly owned subsidiary, Amundi USA, Inc. Prior to July 3, 2017, Pioneer Investments was owned by Pioneer Global Asset Management S.p.A., a wholly owned subsidiary of UniCredit S.p.A. In connection with the transaction, the names of the Fund's investment adviser and principal underwriter changed. Effective July 3, 2017, the name of Pioneer Investment Management, Inc. changed to Amundi Pioneer Asset Management, Inc. and the name of Pioneer Funds Distributor, Inc. changed to Amundi Pioneer Distributor, Inc. This transaction does not impact your existing relationship with Pioneer Investments, your advisor, or the methods you use to communicate with us, as the investor contact telephone numbers and services you expect will remain the same. We are excited, however, to be launching a new website representing the combined company. Come visit us at: www.amundipioneer.com In the following interview, Madelynn Matlock discusses the market environment for international equities and the factors that influenced the performance of Pioneer International Equity Fund during the six-month period ended May 31, 2017. Ms. Matlock, a senior vice president and a portfolio manager at Amundi Pioneer Asset Management, Inc. (Amundi Pioneer), and Marco Pirondini, Executive Vice President, Head of Equities, U.S., and a portfolio manager at Amundi Pioneer, are responsible for the day-to-day management of the Fund. Q How did the Fund perform during the six month period ended May 31, 2017? A Pioneer International Equity Fund's Class A shares returned 18.84% at net asset value during the six-month period ended May 31, 2017, while the Fund's benchmark, the Morgan Stanley Capital International (MSCI) Europe, Australasia, Far East (EAFE) ND Index (the MSCI EAFE Index)(1), (1) The MSCI information may only be used for your internal use, may not be reproduced or re-disseminated in any form and may not be used as a basis for or a component of any financial instruments or products or indices. None of the MSCI information is intended to constitute investment advice or a recommendation to make (or refrain from making) any kind of investment decision and may not be relied on as such. Historical data and analysis should not be taken as an indication or guarantee of any future performance analysis, forecast or prediction. The MSCI information is provided on an "as is" basis and the user of this information assumes the entire risk of any use made of this information. MSCI, each of its affiliates and each other person involved in or related to compiling, computing or creating any MSCI information (collectively, the "MSCI Parties") expressly disclaims all warranties (including, without limitation, any warranties of originality, accuracy, completeness, timeliness, non-infringement, merchantability and fitness for a particular purpose) with respect to this information. Without limiting any of the foregoing, in no event shall any MSCI Party have any liability for any direct, indirect, special, incidental, punitive, consequential (including, without limitation, lost profits) or any other damages. 4 Pioneer International Equity Fund | Semiannual Report | 5/31/17 returned 17.91%. During the same period, the average return of the 460 mutual funds in Lipper's International Multi-Cap Core Funds category was 16.88%, and the average return of the 772 mutual funds in Morningstar's Foreign Large Blend Funds category was 16.92%. Q How would you characterize the investment environment for international equities during the six-month period ended May 31, 2017? A With consumer confidence and corporate earnings improving, international equities enjoyed strong performance during the six-month period. Not only were earnings improving on a global scale, but for the first time in several years, international companies were experiencing more upward earnings revisions than U.S. companies, according to Bloomberg data. The market-friendly outcome in the French elections added to investor confidence in European equities. Against that backdrop, the Fund's benchmark, the MSCI EAFE Index, strongly outperformed U.S. stocks, as measured by the Standard & Poor's 500 Index, which returned 10.80% for the period. From a regional perspective, equities in developing and developed markets rallied, led by Europe (22.74%) and the emerging markets (17.51%). From a sector perspective, information technology (22.20%) and utilities (18.68%) were the strongest-performing sectors within the Fund's benchmark. Meanwhile, energy (-5.08%) was the only sector to post a negative return for the period. Q Which of your investment strategies or individual portfolio holdings contributed positively to the Fund's benchmark-relative performance during the six-month period ended May 31, 2017? A Stock selection in the information technology sector was rewarding for the Fund, especially in the semiconductor industry. Within semiconductors, the Fund's position in Tokyo Electron aided benchmark-relative returns. As one of the most respected companies manufacturing equipment for the production of semiconductor chips, Tokyo Electron saw strong demand for its products during the period. Chips are increasingly finding their way into new products and applications, from light bulbs and cars to industrial equipment, as companies increasingly turn to automation. With automation likely to remain pervasive across industries for the foreseeable future, we believe Tokyo Electron is in a favorable position to continue benefiting from heightened chip demand. The Fund's investments in the United Kingdom (U.K.), particularly in companies exposed to the domestic economy, enjoyed solid performance during the period. For example, our decision to increase the Fund's exposure to homebuilder company Persimmon during times of weakness leading up to the semiannual reporting period proved advantageous and benefited benchmark-relative performance. The U.K. housing market does Pioneer International Equity Fund | Semiannual Report | 5/31/17 5 not have enough supply to meet the high demand, and we believe Persimmon is in a good position to expand its market share in the current environment. Finally, the Fund's position in Unilever, a maker of personal care and cleaning products, contributed to benchmark-relative performance. As with Persimmon, the company faced concerns about how last year's vote in favor of the U.K. leaving the European Union ("Brexit") would affect the country's trading relationship with its European partners. However, with a merger proposal from Kraft Heinz backed by Warren Buffett's Berkshire Hathaway, and with the economic growth outlook across Europe improving, investor interest in the stock rose during the period. Unilever's management ultimately rejected the Kraft Heinz bid, but the announcement piqued investor interest in the company and in management's efforts to build value for its shareholders. Q Which of your investment strategies or individual portfolio holdings detracted from the Fund's benchmark-relative performance during the six-month period ended May 31, 2017? A An out-of-benchmark position in Shire, a U.K. biotechnology company, contributed to the Fund's total returns but did not perform as well as the overall benchmark sector (health care) due to concerns about the company's potential acquisition of Radius Health. An agreement to acquire Radius Health was not reached during the period, but we remain confident in the efforts of Shire's management team to continue adding shareholder value either organically or through acquisitions. After a strong run-up prior to the six-month period, the Fund's investment in Daikin Industries, a global manufacturer of quiet and compact residential and commercial-grade air conditioners, lagged and detracted from benchmark-relative returns during the six months. Investor concerns that the strong Japanese yen would erode the company's profits drove Daikin's underperformance. We remain committed to the stock, however, as Daikin continues to benefit from increased demand from businesses as well as a rising middle class in the Pacific Rim. Finally, the Fund's investment in Schlumberger, an oil-and-gas equipment services company, struggled during the six-month period due to the oversupply of oil and the potential for reduced demand as alternative energy sources continue to be developed. With management's forward guidance suggesting that the current imbalance may affect Schlumberger's earnings in the second half of 2017 and into 2018, we subsequently sold the Fund's position before the end of the period. 6 Pioneer International Equity Fund | Semiannual Report | 5/31/17 Q Did you make any noteworthy shifts in the Fund's strategy or allocations during the six-month period ended May 31, 2017? A We did not make any notable shifts in the Fund's geographic and sector allocations. Prior to the reporting period, we had moved the portfolio to be more in line with the MSCI EAFE Index, adding undervalued European stocks that we believed offered more attractive growth potential, while reducing the Fund's exposure to Asian stocks. As part of that repositioning, we increased the Fund's exposure to European financial stocks, such as ING Group. As we have seen in recent years, European banks have strengthened their balance sheets and reduced the risk profiles of their assets. Accordingly, we believe European banks are generally better capitalized and are operating in a more efficient manner, thus positioning them to grow earnings after years of building up capital. The portfolio's increased exposure to European banks was beneficial for the Fund's performance during the six-month period, as financial stocks fared well. From a sector allocation perspective, the Fund had overweight exposures relative to the benchmark in the information technology and industrials sectors as of May 31, 2017, and had underweight exposures to telecommunication services and utilities stocks. Q Did the Fund have any derivative exposure during the six-month period ended May 31, 2017? A No, we did not invest the Fund in derivative securities during the period. Q What is your outlook for international equities for the balance of 2017? A We are more guarded than last year given the potential for reduced monetary stimulus from major global central banks, particularly the U.S. Federal Reserve. On the other hand, we may see more fiscal stimulus in the major developed economies. We believe corporate earnings are likely to accelerate into 2018, but risks to our outlook remain considerable. In particular, we believe current geopolitical risks are likely to persist through the end of the year, and perhaps beyond. These include risks related to the Brexit process in the U.K., and the potential for increased protectionism (altered trade agreements, tariffs, etc.). Thus, while we continue to be positive on the markets overall, we believe volatility is likely to remain elevated as investors respond to the political discourse on these and other fronts. As we look ahead, we believe Europe's nascent economic recovery will continue to offer interesting investment opportunities, and so will Japan, where stocks remain attractive given low valuations and changes in corporate governance. We will continue to closely follow those and other developments as we seek to identify companies with solid balance sheets and the potential to grow organically amid myriad crosscurrents. Pioneer International Equity Fund | Semiannual Report | 5/31/17 7 Please refer to the Schedule of Investments on pages 16-22 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. Investing in foreign and/or emerging markets securities involves risks relating to interest rates, currency exchange rates, economic, and political conditions. To the extent the Fund invests in issuers located within specific countries or regions, the Fund may be particularly affected by adverse markets, rates, and events, which may occur in those countries and regions. When interest rates rise, the prices of fixed-income securities in the Fund will generally fall. Conversely, when interest rates fall, the prices of fixed-income securities in the Fund will generally rise. At times, the Fund's investments may represent industries or industry sectors that are interrelated or have common risks, making it more susceptible to any economic, political, or regulatory developments or other risks affecting those industries or sectors. 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. 8 Pioneer International Equity Fund | Semiannual Report | 5/31/17 Portfolio Summary | 5/31/17 Sector Distribution -------------------------------------------------------------------------------- (As a percentage of total long-term holdings) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Financials 20.1% Consumer Staples 13.7% Industrials 12.8% Consumer Discretionary 11.9% Health Care 9.8% Information Technology 9.4% Materials 7.1% Real Estate 5.3% Energy 4.5% Telecommunication Services 3.7% Utilities 1.7% Geographical Distribution -------------------------------------------------------------------------------- (As a percentage of total long-term holdings based on a country of domicile) [THE FOLLOWING DATA WAS REPRESENTED AS A BAR CHART IN THE PRINTED MATERIAL] Japan 18.6% France 15.7% United Kingdom 14.9% Switzerland 11.1% Germany 10.9% Ireland 10.1% Netherlands 7.5% United States 1.9% Australia 1.6% Korea, Republic Of 1.4% Spain 1.4% Sweden 1.4% Taiwan, Province of China 1.2% Luxembourg 1.1% Other (individually less than 1%) 1.2% 10 Largest Holdings -------------------------------------------------------------------------------- (As a percentage of total long-term holdings)* 1. Unilever NV 2.30% -------------------------------------------------------------------------------- 2. BNP Paribas SA 2.22 -------------------------------------------------------------------------------- 3. Kerry Group Plc 2.12 -------------------------------------------------------------------------------- 4. Siemens AG 2.09 -------------------------------------------------------------------------------- 5. Schneider Electric SE 2.09 -------------------------------------------------------------------------------- 6. BAE Systems Plc 2.06 -------------------------------------------------------------------------------- 7. Kingspan Group Plc 2.05 -------------------------------------------------------------------------------- 8. Roche Holding AG 2.04 -------------------------------------------------------------------------------- 9. AXA SA 2.00 -------------------------------------------------------------------------------- 10. Zurich Insurance Group AG 1.99 -------------------------------------------------------------------------------- * This list excludes temporary cash investments. The portfolio is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any securities listed. Pioneer International Equity Fund | Semiannual Report | 5/31/17 9 Prices and Distributions | 5/31/17 Net Asset Value per Share -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 5/31/17 11/30/16 -------------------------------------------------------------------------------- A $22.92 $19.45 -------------------------------------------------------------------------------- C $20.03 $16.95 -------------------------------------------------------------------------------- Y $22.94 $19.50 -------------------------------------------------------------------------------- Distributions per Share: 12/1/16-5/31/17 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Short-Term Long-Term Class Dividends Capital Gains Capital Gains -------------------------------------------------------------------------------- A $0.1762 $-- $-- -------------------------------------------------------------------------------- C $0.0170 $-- $-- -------------------------------------------------------------------------------- Y $0.2504 $-- $-- -------------------------------------------------------------------------------- Index Definition -------------------------------------------------------------------------------- The MSCI EAFE ND Index is an unmanaged, commonly used measure of international stocks. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. It is not possible to invest directly in an index. The index defined here pertains to the "Value of $10,000 Investment" and "Value of $5 Million Investment" charts on pages 11-13. 10 Pioneer International Equity Fund | Semiannual Report | 5/31/17 Performance Update | 5/31/17 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 International Equity Fund at public offering price during the periods shown, compared to that of the Morgan Stanley Capital International (MSCI) Europe, Australasia and Far East (EAFE) ND Index. Average Annual Total Returns (As of May 31, 2017) -------------------------------------------------------------------------------- Net Public MSCI Asset Offering EAFE Value Price ND Period (NAV) (POP) Index -------------------------------------------------------------------------------- 10 Years -0.02% -0.61% 1.06% 5 Years 9.58 8.28 10.21 1 Year 16.39 9.71 16.44 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated April 1, 2017) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 1.68% 1.45% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer International Equity Fund MSCI EAFE ND Index 5/07 $9,425 $10,000 5/08 $9,122 $ 9,747 5/09 $5,839 $ 6,179 5/10 $5,916 $ 6,587 5/11 $7,542 $ 8,590 5/12 $5,953 $ 6,831 5/13 $7,625 $ 8,990 5/14 $8,691 $10,612 5/15 $8,955 $10,561 5/16 $8,080 $ 9,539 5/17 $9,404 $11,107 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. Returns would have been lower had sales charges been reflected. POP returns reflect deduction of maximum 5.75% sales charge. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects the contractual expense limitation currently in effect through April 1, 2018, for Class A 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. Pioneer International Equity Fund | Semiannual Report | 5/31/17 11 Performance Update | 5/31/17 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 International Equity Fund during the periods shown, compared to that of the Morgan Stanley Capital International (MSCI) Europe, Australasia and Far East (EAFE) ND Index. Average Annual Total Returns (As of May 31, 2017) -------------------------------------------------------------------------------- MSCI EAFE If If ND Period Held Redeemed Index -------------------------------------------------------------------------------- 10 Years -0.92% -0.92% 1.06% 5 Years 8.59 8.59 10.21 1 Year 15.23 15.23 16.44 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated April 1, 2017) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 2.37% 2.35% -------------------------------------------------------------------------------- Value of $10,000 Investment Pioneer International Equity Fund MSCI EAFE ND Index 5/07 $10,000 $10,000 5/08 $ 9,603 $ 9,747 5/09 $ 6,085 $ 6,179 5/10 $ 6,110 $ 6,587 5/11 $ 7,720 $ 8,590 5/12 $ 6,041 $ 6,831 5/13 $ 7,668 $ 8,990 5/14 $ 8,660 $10,612 5/15 $ 8,843 $10,561 5/16 $ 7,915 $ 9,539 5/17 $ 9,120 $11,107 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. Returns would have been lower had sales charges been reflected. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects the contractual expense limitation currently in effect through April 1, 2018, for Class C 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. 12 Pioneer International Equity Fund | Semiannual Report | 5/31/17 Performance Update | 5/31/17 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 International Equity Fund during the periods shown, compared to that of the Morgan Stanley Capital International (MSCI) Europe, Australasia and Far East (EAFE) ND Index. Average Annual Total Returns (As of May 31, 2017) -------------------------------------------------------------------------------- Net MSCI Asset EAFE Value ND Period (NAV) Index -------------------------------------------------------------------------------- 10 Years 0.32% 1.06% 5 Years 10.01 10.21 1 Year 16.75 16.44 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated April 1, 2017) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 1.09% -------------------------------------------------------------------------------- Value of $5 Million Investment Pioneer International Equity Fund MSCI EAFE ND Index 5/07 $5,000,000 $5,000,000 5/08 $4,840,027 $4,873,409 5/09 $3,101,431 $3,089,342 5/10 $3,154,789 $3,293,646 5/11 $4,041,881 $4,295,148 5/12 $3,203,313 $3,415,307 5/13 $4,119,560 $4,495,134 5/14 $4,714,750 $5,306,193 5/15 $4,876,736 $5,280,710 5/16 $4,420,851 $4,769,632 5/17 $5,161,537 $5,553,589 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 were first publicly offered on April 16, 2009. Performance shown for periods prior to the inception of Class Y shares on April 16, 2009, reflects the NAV performance of the Fund's Class A shares. The performance does not reflect differences in expenses, including the Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares are generally higher than those of Class Y shares, the performance for Class Y shares prior to their inception would have been higher than the performance shown. For the period beginning April 16, 2009, the actual performance of Class Y shares is reflected. Class Y shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. Please refer to the financial highlights for a more current expense ratio. Pioneer International Equity Fund | Semiannual Report | 5/31/17 13 Comparing Ongoing Fund Expenses As a shareowner in the Fund, you incur two types of costs: (1) ongoing costs, including management fees, distribution and/or service (12b-1) fees, and other Fund expenses; and (2) transaction costs, including sales charges (loads) on purchase payments. This example is intended to help you understand your ongoing expenses (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. The example is based on an investment of $1,000 at the beginning of the Fund's latest six-month period and held throughout the six months. Using the Tables -------------------------------------------------------------------------------- Actual Expenses The first table below provides information about actual account values and actual expenses. You may use the information in this table, together with the amount you invested, to estimate the expenses that you paid over the period as follows: (1) Divide your account value by $1,000 Example: an $8,600 account value (divided by) $1,000 = 8.6 (2) Multiply the result in (1) above by the corresponding share class's number in the third row under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. Expenses Paid on a $1,000 Investment in Pioneer International Equity Fund Based on actual returns from December 1, 2016, through May 31, 2017. --------------------------------------------------------------------------------- Share Class A C Y --------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 Value on 12/1/16 --------------------------------------------------------------------------------- Ending Account $1,188.40 $1,182.90 $1,191.50 Value (after expenses) on 5/31/17 --------------------------------------------------------------------------------- Expenses Paid $ 7.91 $ 12.79 $ 5.68 During Period* --------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized net expense ratio of 1.45%, 2.35% and 1.04% for Class A, Class C and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 182/365 (to reflect the one-half year period). 14 Pioneer International Equity Fund | Semiannual Report | 5/31/17 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), or redemption fees 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 International Equity Fund Based on a hypothetical 5% return per year before expenses, reflecting the period from December 1, 2016, through May 31, 2017. --------------------------------------------------------------------------------- Share Class A C Y --------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 Value on 12/1/16 --------------------------------------------------------------------------------- Ending Account $1,017.70 $1,013.21 $1,019.75 Value (after expenses) on 5/31/17 --------------------------------------------------------------------------------- Expenses Paid $ 7.29 $ 11.80 $ 5.24 During Period* --------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized net expense ratio of 1.45%, 2.35% and 1.04% for Class A, Class C and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 182/365 (to reflect the one-half year period). Pioneer International Equity Fund | Semiannual Report | 5/31/17 15 Schedule of Investments | 5/31/17 (unaudited) ------------------------------------------------------------------------------------------ Shares Value ------------------------------------------------------------------------------------------ COMMON STOCKS -- 98.4% ENERGY -- 4.5% Oil & Gas Equipment & Services -- 1.3% 32,200 Schlumberger, Ltd. $ 2,240,798 ------------------------------------------------------------------------------------------ Integrated Oil & Gas -- 3.2% 95,300 Royal Dutch Shell Plc $ 2,593,684 54,300 TOTAL SA 2,893,810 ------------- $ 5,487,494 ------------- Total Energy $ 7,728,292 ------------------------------------------------------------------------------------------ MATERIALS -- 7.1% Diversified Chemicals -- 0.9% 16,100 BASF SE $ 1,519,560 ------------------------------------------------------------------------------------------ Specialty Chemicals -- 2.0% 65,882 Croda International Plc $ 3,369,859 ------------------------------------------------------------------------------------------ Construction Materials -- 0.9% 45,700 CRH Plc $ 1,647,895 ------------------------------------------------------------------------------------------ Paper Packaging -- 3.3% 242,300 Amcor, Ltd. $ 2,759,930 103,000 Smurfit Kappa Group Plc 2,905,505 ------------- $ 5,665,435 ------------- Total Materials $ 12,202,749 ------------------------------------------------------------------------------------------ CAPITAL GOODS -- 12.7% Aerospace & Defense -- 2.0% 407,600 BAE Systems Plc $ 3,500,736 ------------------------------------------------------------------------------------------ Building Products -- 1.9% 32,700 Daikin Industries, Ltd. $ 3,213,358 ------------------------------------------------------------------------------------------ Electrical Components & Equipment -- 3.7% 110,900 ABB, Ltd. $ 2,795,416 46,100 Schneider Electric SE 3,555,939 ------------- $ 6,351,355 ------------------------------------------------------------------------------------------ Heavy Electrical Equipment -- 1.3% 165,700 Mitsubishi Electric Corp. $ 2,291,032 ------------------------------------------------------------------------------------------ Industrial Conglomerates -- 2.1% 24,900 Siemens AG $ 3,558,118 ------------------------------------------------------------------------------------------ Agricultural & Farm Machinery -- 1.7% 184,000 Kubota Corp. $ 2,920,306 ------------- Total Capital Goods $ 21,834,905 ------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 16 Pioneer International Equity Fund | Semiannual Report | 5/31/17 ------------------------------------------------------------------------------------------ Shares Value ------------------------------------------------------------------------------------------ AUTOMOBILES & COMPONENTS -- 2.5% Auto Parts & Equipment -- 2.5% 81,800 NGK Spark Plug Co., Ltd. $ 1,667,572 37,600 Valeo SA 2,623,376 ------------- $ 4,290,948 ------------- Total Automobiles & Components $ 4,290,948 ------------------------------------------------------------------------------------------ CONSUMER DURABLES & APPAREL -- 4.0% Consumer Electronics -- 1.1% 147,300 Panasonic Corp. $ 1,894,812 ------------------------------------------------------------------------------------------ Homebuilding -- 2.9% 1,225,368 Cairn Homes Plc $ 2,191,704 87,100 Persimmon Plc 2,757,991 ------------- $ 4,949,695 ------------- Total Consumer Durables & Apparel $ 6,844,507 ------------------------------------------------------------------------------------------ CONSUMER SERVICES -- 2.9% Hotels, Resorts & Cruise Lines -- 1.1% 28,500 Carnival Plc $ 1,827,215 ------------------------------------------------------------------------------------------ Restaurants -- 1.8% 57,400 Whitbread Plc $ 3,176,288 ------------- Total Consumer Services $ 5,003,503 ------------------------------------------------------------------------------------------ MEDIA -- 2.4% Advertising -- 1.3% 30,000 Publicis Groupe SA $ 2,300,912 ------------------------------------------------------------------------------------------ Broadcasting -- 1.1% 735,700 ITV Plc $ 1,856,441 ------------- Total Media $ 4,157,353 ------------------------------------------------------------------------------------------ FOOD & STAPLES RETAILING -- 2.6% Drug Retail -- 1.4% 62,800 Sundrug Co., Ltd. $ 2,449,147 ------------------------------------------------------------------------------------------ Food Retail -- 1.2% 49,200 Seven & I Holdings Co., Ltd. $ 2,096,438 ------------- Total Food & Staples Retailing $ 4,545,585 ------------------------------------------------------------------------------------------ FOOD, BEVERAGE & TOBACCO -- 5.4% Packaged Foods & Meats -- 5.4% 41,500 Danone SA $ 3,084,747 41,100 Kerry Group Plc 3,606,376 29,600 Nestle SA 2,529,613 ------------- $ 9,220,736 ------------- Total Food, Beverage & Tobacco $ 9,220,736 ------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer International Equity Fund | Semiannual Report | 5/31/17 17 Schedule of Investments | 5/31/17 (unaudited) (continued) ------------------------------------------------------------------------------------------ Shares Value ------------------------------------------------------------------------------------------ HOUSEHOLD & PERSONAL PRODUCTS -- 5.6% Household Products -- 1.5% 20,900 Henkel AG & Co. KGaA $ 2,598,804 ------------------------------------------------------------------------------------------ Personal Products -- 4.1% 14,400 L'Oreal SA $ 3,085,072 68,400 Unilever NV 3,900,443 ------------- $ 6,985,515 ------------- Total Household & Personal Products $ 9,584,319 ------------------------------------------------------------------------------------------ HEALTH CARE EQUIPMENT & SERVICES -- 3.5% Health Care Supplies -- 1.9% 67,600 Hoya Corp. $ 3,339,770 ------------------------------------------------------------------------------------------ Health Care Services -- 1.6% 31,200 Fresenius SE & Co. KGaA $ 2,674,977 ------------- Total Health Care Equipment & Services $ 6,014,747 ------------------------------------------------------------------------------------------ PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 6.2% Biotechnology -- 1.6% 47,700 Shire Plc $ 2,749,069 ------------------------------------------------------------------------------------------ Pharmaceuticals -- 3.6% 33,800 Novartis AG $ 2,769,224 12,606 Roche Holding AG 3,467,957 ------------- $ 6,237,181 ------------------------------------------------------------------------------------------ Life Sciences Tools & Services -- 1.0% 19,600 Gerresheimer AG $ 1,681,017 ------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 10,667,267 ------------------------------------------------------------------------------------------ BANKS -- 7.6% Diversified Banks -- 7.6% 523,800 Aldermore Group Plc $ 1,646,240 836,700 Barclays Plc 2,260,531 53,300 BNP Paribas SA 3,771,981 178,400 ING Groep NV 2,984,003 102,000 Swedbank AB 2,460,489 ------------- $ 13,123,244 ------------- Total Banks $ 13,123,244 ------------------------------------------------------------------------------------------ DIVERSIFIED FINANCIALS -- 5.2% Other Diversified Financial Services -- 2.0% 100,800 Kingspan Group Plc $ 3,489,752 ------------------------------------------------------------------------------------------ Diversified Capital Markets -- 1.2% 130,000 UBS Group AG $ 2,070,521 ------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 18 Pioneer International Equity Fund | Semiannual Report | 5/31/17 ------------------------------------------------------------------------------------------ Shares Value ------------------------------------------------------------------------------------------ Specialized Finance -- 2.0% 63,600 Euronext NV $ 3,335,016 ------------- Total Diversified Financials $ 8,895,289 ------------------------------------------------------------------------------------------ INSURANCE -- 5.0% Multi-line Insurance -- 5.0% 8,900 Allianz SE* $ 1,711,121 127,300 AXA SA 3,403,387 11,500 Zurich Insurance Group AG 3,385,601 ------------- $ 8,500,109 ------------- Total Insurance $ 8,500,109 ------------------------------------------------------------------------------------------ REAL ESTATE -- 6.8% Diversified REIT -- 1.5% 1,665,215 Hibernia Real Estate Investment Trust Plc* $ 2,612,760 ------------------------------------------------------------------------------------------ Diversified REIT -- 1.9% 507,700 Hibernia Real Estate Investment Trust Plc* $ 793,697 189,000 Merlin Properties Socimi SA 2,400,040 ------------- $ 3,193,737 ------------------------------------------------------------------------------------------ Real Estate Operating Companies -- 3.4% 91,200 Grand City Properties SA $ 1,891,903 555,900 Ichigo, Inc. 1,605,340 59,299 Vonovia SE* 2,332,727 ------------- $ 5,829,970 ------------- Total Real Estate $ 11,636,467 ------------------------------------------------------------------------------------------ SOFTWARE & SERVICES -- 1.8% IT Consulting & Other Services -- 0.7% 94,418 HCL Technologies, Ltd. $ 1,258,864 ------------------------------------------------------------------------------------------ Application Software -- 1.1% 20,000 Temenos Group AG $ 1,862,809 ------------- Total Software & Services $ 3,121,673 ------------------------------------------------------------------------------------------ TECHNOLOGY HARDWARE & EQUIPMENT -- 3.1% Computer Hardware Storage & Peripherals -- 1.4% 1,200 Samsung Electronics Co., Ltd. $ 2,389,287 ------------------------------------------------------------------------------------------ Electronic Equipment Manufacturers -- 1.7% 6,400 Keyence Corp. $ 2,915,814 ------------- Total Technology Hardware & Equipment $ 5,305,101 ------------------------------------------------------------------------------------------ SEMICONDUCTORS & SEMICONDUCTOR EQUIPMENT -- 4.5% Semiconductor Equipment -- 1.8% 21,200 Tokyo Electron, Ltd. $ 3,013,910 ------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer International Equity Fund | Semiannual Report | 5/31/17 19 Schedule of Investments | 5/31/17 (unaudited) (continued) ------------------------------------------------------------------------------------------ Shares Value ------------------------------------------------------------------------------------------ Semiconductors -- 2.7% 116,200 Infineon Technologies AG $ 2,575,481 306,000 Taiwan Semiconductor Manufacturing Co., Ltd. 2,054,680 ------------- $ 4,630,161 ------------- Total Semiconductors & Semiconductor Equipment $ 7,644,071 ------------------------------------------------------------------------------------------ TELECOMMUNICATION SERVICES -- 3.7% Integrated Telecommunication Services -- 2.5% 46,500 Nippon Telegraph & Telephone Corp. $ 2,234,101 119,100 Orange SA 2,096,483 ------------- $ 4,330,584 ------------------------------------------------------------------------------------------ Wireless Telecommunication Services -- 1.2% 71,700 KDDI Corp. $ 1,989,641 ------------- Total Telecommunication Services $ 6,320,225 ------------------------------------------------------------------------------------------ UTILITIES -- 1.3% Electric Utilities -- 1.3% 112,600 SSE Plc $ 2,184,753 ------------- Total Utilities $ 2,184,753 ------------------------------------------------------------------------------------------ TOTAL COMMON STOCKS (Cost $142,239,887) $ 168,825,843 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ Principal Amount ($) ------------------------------------------------------------------------------------------ U.S. GOVERNMENT AND AGENCY OBLIGATIONS -- 0.6% 430,000 U.S. Treasury Bill, 7/6/17 (c) $ 429,689 600,000 U.S. Treasury Bill, 6/8/17 (c) 599,921 ------------- $ 1,029,610 ------------------------------------------------------------------------------------------ TOTAL U.S. GOVERNMENT AND AGENCY OBLIGATIONS (Cost $1,029,615) $ 1,029,610 ------------------------------------------------------------------------------------------ TOTAL INVESTMENT IN SECURITIES -- 99.0% (Cost $143,269,502) (a) $ 169,855,453 ------------------------------------------------------------------------------------------ OTHER ASSETS & LIABILITIES -- 1.0% $ 1,764,245 ------------------------------------------------------------------------------------------ TOTAL NET ASSETS -- 100.0% $ 171,619,698 ========================================================================================== * Non-income producing security. (A.D.R.) American Depositary Receipts. REIT Real Estate Investment Trust. The accompanying notes are an integral part of these financial statements. 20 Pioneer International Equity Fund | Semiannual Report | 5/31/17 (a) At May 31, 2017, the net unrealized appreciation on investments based on cost for federal income tax purposes of $144,247,100 was as follows: Aggregate gross unrealized appreciation for all investments in which there is an excess of value over tax cost $34,476,123 Aggregate gross unrealized depreciation for all investments in which there is an excess of tax cost over value (8,867,770) ----------- Net unrealized appreciation $25,608,353 =========== (b) Distributions of investments by country of domicile (excluding temporary cash investments) as a percentage of total investment in securities, is as follows: Japan 18.6% France 15.7 United Kingdom 14.9 Switzerland 11.1 Germany 10.9 Ireland 10.1 Netherlands 7.5 United States 1.9 Australia 1.6 Korea, Republic Of 1.4 Spain 1.4 Sweden 1.4 Taiwan, Province Of China 1.2 Luxembourg 1.1 Other (individually less than 1%) 1.2 ----- 100.0% ===== (c) Security issued with a zero coupon. Income is earned through accretion of discount. Purchases and sales of securities (excluding temporary cash investments) for the six months ended May 31, 2017, aggregated $22,267,488 and $29,031,218, respectively. 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., (Amundi Pioneer) formerly Pioneer Investment Management, Inc. (PIM), 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 six months ended May 31, 2017, the Fund did not engage in cross trade activity. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. Level 1 - quoted prices in active markets for identical securities. Level 2 - other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.) See Notes to Financial Statements -- Note 1A. Level 3 - significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) See Notes to Financial Statements -- Note 1A. The accompanying notes are an integral part of these financial statements. Pioneer International Equity Fund | Semiannual Report | 5/31/17 21 Schedule of Investments | 5/31/17 (unaudited) (continued) The following is a summary of the inputs used as of May 31, 2017, in valuing the Fund's investments: --------------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total --------------------------------------------------------------------------------------- Common Stocks Energy Oil & Gas Equipment & Services $2,240,798 $ -- $-- $ 2,240,798 All Other Common Stocks* -- 166,585,045 -- 166,585,045 U.S. Government and Agency Obligations -- 1,029,610 -- 1,029,610 --------------------------------------------------------------------------------------- Total $2,240,798 $ 167,614,655 $-- $169,855,453 ======================================================================================= * Level 2 securities are valued using inputs/data furnished by independent pricing services using fair value factors. During the six months ended May 31, 2017, there were no transfers between Levels 1, 2 and 3. The accompanying notes are an integral part of these financial statements. 22 Pioneer International Equity Fund | Semiannual Report | 5/31/17 Statement of Assets and Liabilities | 5/31/17 (unaudited) ASSETS: Investment in securities (cost $143,269,502) $ 169,855,453 Cash 852,854 Foreign currencies, at value (cost $98,240) 98,641 Receivables -- Fund shares sold 64,744 Dividends and foreign taxes withheld 1,260,699 Due from Amundi Pioneer Asset Management, Inc., formerly Pioneer Investment Management, Inc. 4,011 Other assets 26,546 -------------------------------------------------------------------------------- Total assets $ 172,162,948 ================================================================================ LIABILITIES: Payables -- Fund shares repurchased $ 215,938 Distributions 93 Trustee fees 1,144 Transfer agent fees 69,105 Registration fees 45,993 Audit fees 19,343 Due to affiliates 169,209 Accrued expenses 22,425 -------------------------------------------------------------------------------- Total liabilities $ 543,250 ================================================================================ NET ASSETS: Paid-in capital $ 262,099,701 Undistributed net investment income 841,657 Accumulated net realized loss on investments and foreign currency transactions (117,869,241) Net unrealized appreciation on investments 26,585,951 Net unrealized depreciation on other assets and liabilities denominated in foreign currencies (38,370) -------------------------------------------------------------------------------- Net assets $ 171,619,698 ================================================================================ NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Class A (based on $74,760,250/3,261,980 shares) $ 22.92 Class C (based on $10,449,549/521,566 shares) $ 20.03 Class Y (based on $86,409,899/3,767,597 shares) $ 22.94 MAXIMUM OFFERING PRICE: Class A ($22.92 (divided by) 94.25%) $ 24.32 ================================================================================ The accompanying notes are an integral part of these financial statements. Pioneer International Equity Fund | Semiannual Report | 5/31/17 23 Statement of Operations (unaudited) For the Six Months Ended 5/31/17 INVESTMENT INCOME: Dividends (net of foreign taxes withheld of $302,569) $ 2,861,013 Interest 4,424 ---------------------------------------------------------------------------------------------- Total investment income $ 2,865,437 ---------------------------------------------------------------------------------------------- EXPENSES: Management fees $ 671,948 Transfer agent fees Class A 67,415 Class C 9,463 Class Y 1,130 Distribution fees Class A 86,471 Class C 49,821 Shareholder communications expense 57,495 Administrative expense 48,993 Custodian fees 18,639 Registration fees 27,420 Professional fees 21,839 Printing expense 5,573 Fees and expenses of nonaffiliated Trustees 3,459 Miscellaneous 23,171 ---------------------------------------------------------------------------------------------- Total expenses $ 1,092,837 Less fees waived and expenses reimbursed by Amundi Pioneer Asset Management, Inc., (Amundi Pioneer) formerly Pioneer Investment Management, Inc. (PIM) (62,743) ---------------------------------------------------------------------------------------------- Net expenses $ 1,030,094 ---------------------------------------------------------------------------------------------- Net investment income $ 1,835,343 ---------------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS, AND FOREIGN CURRENCY TRANSACTIONS: Net realized gain (loss) on: Investments $ 2,816,698 Other assets and liabilities denominated in foreign currencies (41,955) $ 2,774,743 ---------------------------------------------------------------------------------------------- Change in net unrealized appreciation (depreciation) on: Investments $23,073,406 Other assets and liabilities denominated in foreign currencies 49,240 $23,122,646 ---------------------------------------------------------------------------------------------- Net realized and unrealized gain (loss) on investments and foreign currency transactions $25,897,389 ---------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $27,732,732 ============================================================================================== The accompanying notes are an integral part of these financial statements. 24 Pioneer International Equity Fund | Semiannual Report | 5/31/17 Statements of Changes in Net Assets ------------------------------------------------------------------------------------------ Six Months Ended 5/31/17 Year Ended (unaudited) 11/30/16 ------------------------------------------------------------------------------------------ FROM OPERATIONS: Net investment income $ 1,835,343 $ 1,905,984 Net realized gain (loss) on investments, futures contracts, and foreign currency transactions 2,774,743 (10,202,926) Change in net unrealized appreciation (depreciation) on investments, futures contracts and foreign currency transactions 23,122,646 490,254 ------------------------------------------------------------------------------------------ Net increase (decrease) in net assets resulting from operations $ 27,732,732 $ (7,806,688) ------------------------------------------------------------------------------------------ DISTRIBUTIONS TO SHAREOWNERS: Net investment income: Class A ($0.18 and $0.33 per share, respectively) $ (590,165) $ (1,211,983) Class C ($0.02 and $0.19 per share, respectively) (9,746) (125,805) Class Y ($0.25 and $0.42 per share, respectively) (956,462) (1,712,039) ------------------------------------------------------------------------------------------ Total distributions to shareowners $ (1,556,373) $ (3,049,827) ------------------------------------------------------------------------------------------ FROM FUND SHARE TRANSACTIONS: Net proceeds from sale of shares $ 5,761,062 $ 6,785,651 Reinvestment of distributions 585,065 1,332,456 Cost of shares repurchased (11,023,101) (21,251,717) ------------------------------------------------------------------------------------------ Net decrease in net assets resulting from Fund share transactions $ (4,676,974) $ (13,133,610) ------------------------------------------------------------------------------------------ Net increase (decrease) in net assets $ 21,499,385 $ (23,990,125) NET ASSETS: Beginning of period $150,120,313 $ 174,110,438 ------------------------------------------------------------------------------------------ End of period $171,619,698 $ 150,120,313 ------------------------------------------------------------------------------------------ Undistributed net investment income $ 841,657 $ 562,687 ========================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer International Equity Fund | Semiannual Report | 5/31/17 25 Statements of Changes in Net Assets (continued) --------------------------------------------------------------------------------------- Six Months Six Months Ended Ended 5/31/17 5/31/17 Year Ended Year Ended Shares Amount 11/30/16 11/30/16 (unaudited) (unaudited) Shares Amount --------------------------------------------------------------------------------------- Class A Shares sold 178,400 $ 3,727,016 211,512 $ 4,111,213 Reinvestment of distributions 28,800 563,041 57,160 1,153,475 Less shares repurchased (330,024) (6,854,494) (605,069) (11,814,805) --------------------------------------------------------------------------------------- Net decrease (122,824) $ (2,564,437) (336,397) $ (6,550,117) ======================================================================================= Class C Shares sold 76,709 $ 1,418,382 80,672 $ 1,374,118 Reinvestment of distributions 534 9,169 6,660 118,087 Less shares repurchased (135,644) (2,492,951) (168,136) (2,860,729) --------------------------------------------------------------------------------------- Net decrease (58,401) $ (1,065,400) (80,804) $ (1,368,524) ======================================================================================= Class Y Shares sold 28,807 $ 615,664 65,581 $ 1,300,320 Reinvestment of distributions 658 12,855 3,021 60,894 Less shares repurchased (79,582) (1,675,656) (333,726) (6,576,183) --------------------------------------------------------------------------------------- Net decrease (50,117) $ (1,047,137) (265,124) $ (5,214,969) ======================================================================================= The accompanying notes are an integral part of these financial statements. 26 Pioneer International Equity Fund | Semiannual Report | 5/31/17 Financial Highlights ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 5/31/17 Ended Ended Ended Ended Ended (unaudited) 11/30/16 11/30/15 11/30/14 11/30/13 11/30/12 ------------------------------------------------------------------------------------------------------------------------------------ Class A Net asset value, beginning of period $ 19.45 $ 20.74 $ 22.34 $ 22.49 $ 18.67 $ 17.99 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) $ 0.23(a) $ 0.21(a) $ 0.16(a) $ 0.63 $ 0.27 $ 0.36 Net realized and unrealized gain (loss) on investments 3.42 (1.17) (0.53) (0.28) 3.87 0.58 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 3.65 $ (0.96) $ (0.37) $ 0.35 $ 4.14 $ 0.94 ------------------------------------------------------------------------------------------------------------------------------------ Distribution to shareowners: Net investment income $ (0.18) $ (0.33) $ (1.23) $ (0.50) $ (0.32) $ (0.26) ------------------------------------------------------------------------------------------------------------------------------------ Total distributions $ (0.18) $ (0.33) $ (1.23) $ (0.50) $ (0.32) $ (0.26) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 3.47 $ (1.29) $ (1.60) $ (0.15) $ 3.82 $ 0.68 ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 22.92 $ 19.45 $ 20.74 $ 22.34 $ 22.49 $ 18.67 ==================================================================================================================================== Total return* 18.84% (4.70)% (1.69)% 1.55% 22.50% 5.38% Ratio of net expenses to average net assets (b) 1.45%** 1.45% 1.45% 1.46% 1.45% 1.45% Ratio of net investment income (loss) to average net assets 2.17%** 1.10% 0.73% 2.72% 1.26% 1.89% Portfolio turnover rate 29%** 41% 49% 100% 101% 61% Net assets, end of period (in thousands) $74,760 $65,844 $77,173 $83,544 $86,602 $75,784 Ratios with no waiver of fees and assumption of expenses by Amundi Pioneer formerly PIM, and no reduction for fees paid indirectly: Total expenses to average net assets (b) 1.63%** 1.68% 1.71% 1.70% 1.69% 1.82% Net investment income (loss) to average net assets 1.99%** 0.87% 0.47% 2.48% 1.02% 1.53% ==================================================================================================================================== * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized. (a) The per-share data presented above is based on the average shares outstanding for the period presented. (b) Includes interest expense of 0.00%, 0.00%, 0.00%, 0.01%, 0.00% and 0.00%, respectively. The accompanying notes are an integral part of these financial statements. Pioneer International Equity Fund | Semiannual Report | 5/31/17 27 Financial Highlights (continued) ---------------------------------------------------------------------------------------------------------------------------------- Six Months Ended Year Year Year Year Year 5/31/17 Ended Ended Ended Ended Ended (unaudited) 11/30/16 11/30/15 11/30/14 11/30/13 11/30/12 ---------------------------------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of period $ 16.95 $ 18.13 $ 19.69 $ 19.91 $ 16.57 $ 15.97 ---------------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (loss) $ 0.11(a) $ 0.03(a) $ (0.04)(a) $ 0.35 $ 0.08 $ 0.18 Net realized and unrealized gain (loss) on investments 2.99 (1.02) (0.46) (0.23) 3.44 0.53 ---------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 3.10 $ (0.99) $ (0.50) $ 0.12 $ 3.52 $ 0.71 ---------------------------------------------------------------------------------------------------------------------------------- Distribution to shareowners: Net investment income $ (0.02) $ (0.19) $ (1.06) $ (0.34) $ (0.18) $ (0.11) ---------------------------------------------------------------------------------------------------------------------------------- Total distributions $ (0.02) $ (0.19) $ (1.06) $ (0.34) $ (0.18) $ (0.11) ---------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 3.08 $ (1.18) $ (1.56) $ (0.22) $ 3.34 $ 0.60 ---------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 20.03 $ 16.95 $ 18.13 $ 19.69 $ 19.91 $ 16.57 ================================================================================================================================== Total return* 18.29% (5.50)% (2.58)% 0.60% 21.43% 4.48% Ratio of net expenses to average net assets (b) 2.35%** 2.35% 2.35% 2.36% 2.35% 2.35% Ratio of net investment income (loss) to average net assets 1.24%** 0.20% (0.20)% 1.78% 0.36% 0.99% Portfolio turnover rate 29%** 41% 49% 100% 101% 61% Net assets, end of period (in thousands) $10,450 $ 9,829 $11,981 $10,865 $10,826 $ 9,910 Ratios with no waiver of fees and assumption of expenses by Amundi Pioneer formerly PIM, and no reduction for fees paid indirectly: Total expenses to average net assets (b) 2.36%** 2.37% 2.42% 2.44% 2.41% 2.63% Net investment income (loss) to average net assets 1.23%** 0.18% (0.27)% 1.70% 0.30% 0.71% ================================================================================================================================== * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized. (a) The per-share data presented above is based on the average shares outstanding for the period presented. (b) Includes interest expense of 0.00%, 0.00%, 0.00%, 0.01%, 0.00% and 0.00%, respectively. The accompanying notes are an integral part of these financial statements. 28 Pioneer International Equity Fund | Semiannual Report | 5/31/17 ---------------------------------------------------------------------------------------------------------------------------------- Six Months Ended Year Year Year Year Year 5/31/17 Ended Ended Ended Ended Ended (unaudited) 11/30/16 11/30/15 11/30/14 11/30/13 11/30/12 ---------------------------------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 19.50 $ 20.81 $ 22.41 $ 22.56 $ 18.73 $ 18.07 ---------------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (loss) $ 0.27(a) $ 0.28(a) $ 0.25(a) $ 1.29 $ 0.37 $ 0.41 Net realized and unrealized gain (loss) on investments 3.42 (1.17) (0.54) (0.85) 3.87 0.60 ---------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 3.69 $ (0.89) $ (0.29) $ 0.44 $ 4.24 $ 1.01 ---------------------------------------------------------------------------------------------------------------------------------- Distribution to shareowners: Net investment income $ (0.25) $ (0.42) $ (1.31) $ (0.59) $ (0.41) $ (0.35) ---------------------------------------------------------------------------------------------------------------------------------- Total distributions $ (0.25) $ (0.42) $ (1.31) $ (0.59) $ (0.41) $ (0.35) ---------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 3.44 $ (1.31) $ (1.60) $ (0.15) $ 3.83 $ 0.66 ---------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 22.94 $ 19.50 $ 20.81 $ 22.41 $ 22.56 $ 18.73 ================================================================================================================================== Total return* 19.15% (4.34)% (1.29)% 1.94% 23.02% 5.79% Ratio of net expenses to average net assets (b) 1.04%** 1.09% 1.04% 1.06% 1.04% 1.01% Ratio of net investment income (loss) to average net assets 2.59%** 1.45% 1.16% 3.89% 1.69% 2.35% Portfolio turnover rate 29%** 41% 49% 100% 101% 61% Net assets, end of period (in thousands) $86,410 $74,448 $84,957 $102,563 $224,523 $216,217 ================================================================================================================================== * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period. ** Annualized. (a) The per-share data presented above is based on the average shares outstanding for the period presented. (b) Includes interest expense of 0.00%, 0.00%, 0.00%, 0.01%, 0.00% and 0.00%, respectively. The accompanying notes are an integral part of these financial statements. Pioneer International Equity Fund | Semiannual Report | 5/31/17 29 Notes to Financial Statements | 5/31/17 (unaudited) 1. Organization and Significant Accounting Policies Pioneer International Equity Fund (formerly Pioneer International Value Fund) (the Fund) is the sole portfolio comprising Pioneer Series Trust VIII, 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 long-term growth of capital. The Fund offered three classes of shares designated as Class A, Class C and Class Y shares. 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 Y shares. On July 3, 2017, Amundi acquired Pioneer Investments, a group of asset management companies located throughout the world. Amundi, one of the world's largest asset managers, is headquartered in Paris, France. As a result of the transaction, Pioneer Investment Management, Inc., the Fund's investment adviser, became an indirect wholly owned subsidiary of Amundi and Amundi's wholly owned subsidiary, Amundi USA, Inc. Prior to July 3, 2017, Pioneer Investments was owned by Pioneer Global Asset Management S.p.A., a wholly owned subsidiary of UniCredit S.p.A. In connection with the transaction, the names of the Fund's investment adviser and principal underwriter changed. Effective July 3, 2017, the name of Pioneer Investment Management, Inc. changed to Amundi Pioneer Asset Management, Inc. and the name of Pioneer Funds Distributor, Inc. changed to Amundi Pioneer Distributor, Inc. The Fund's financial statements have been prepared in conformity with U.S. generally accepted accounting principles (U.S. GAAP) that require the management of the Fund to make estimates and assumptions that affect the 30 Pioneer International Equity Fund | Semiannual Report | 5/31/17 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 Fund is an investment company and follows investment company accounting and reporting guidance under U.S. GAAP. 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 principal exchanges and markets for non-U.S. equity securities have closing times prior to the close of the NYSE. However, the value of these securities may be influenced by changes in global markets occurring after the closing times of the local exchanges and markets up to the time the Fund determines its net asset value. Consequently, the Fund uses a fair value model developed by an independent pricing service to value non-U.S. equity securities. On a daily basis, the pricing service recommends changes, based on a proprietary model, to the closing market prices of each non-U.S. security held by the Fund to reflect the security's fair value at the time the Fund determines its net asset value. The Fund applies these recommendations in accordance with procedures approved by the Board of Trustees. 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 Amundi Pioneer Asset Management, Inc., (Amundi Pioneer), formerly Pioneer Investment Management, Inc. (PIM), the Fund's investment adviser, pursuant to procedures adopted by the Board of Trustees. Amundi Pioneer's, formerly PIM's, fair valuation team uses fair value methods approved by the Valuation Pioneer International Equity Fund | Semiannual Report | 5/31/17 31 Committee of the Board of Trustees. Amundi Pioneer's, formerly PIM'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 May 31, 2017, there were no securities that were valued using fair value methods (other than securities valued using prices supplied by independent pricing services). 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. 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. 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 32 Pioneer International Equity Fund | Semiannual Report | 5/31/17 investments are not segregated in the Statement of Operations from the effects of changes in the market price 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 November 30, 2016, 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 in the Statement of Operations. Tax returns filed within the prior three years remain subject to examination by federal and state tax authorities. In addition to meeting the requirements of the Internal Revenue Code, the Fund may be required to pay local taxes on the recognition of capital gains and/or the repatriation of foreign currencies in certain countries. During the six months ended May 31, 2017, the Fund paid no such taxes. 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 overdistributions for financial statement purposes resulting from differences in the recognition or classification of income or distributions for financial statement and tax purposes. Capital accounts within the financial statements are adjusted for permanent book/tax differences to reflect tax character, but are not adjusted for temporary differences. The tax character of current year distributions payable will be determined at the end of the current taxable year. The tax character of distributions paid during the fiscal year ended November 30, 2016 was as follows: --------------------------------------------------------------------------- 2016 --------------------------------------------------------------------------- Distribution paid from: Ordinary income $3,049,827 --------------------------------------------------------------------------- Total $3,049,827 =========================================================================== Pioneer International Equity Fund | Semiannual Report | 5/31/17 33 The following shows the components of distributable earnings on a federal income tax basis at November 30, 2016: --------------------------------------------------------------------------- 2016 --------------------------------------------------------------------------- Distributable earnings: Undistributed ordinary income $ 1,559,252 Capital loss carryforward (120,239,519) Current year late year loss deferral (423,432) Net unrealized appreciation 2,447,337 --------------------------------------------------------------------------- Total $(116,656,362) =========================================================================== The difference between book-basis and tax-basis net unrealized appreciation is attributable to the tax deferral of losses on wash sales and adjustments relating to PFICs. E. Fund Shares The Fund records sales and repurchases of its shares as of trade date. Amundi Pioneer Distributor, Inc., formerly Pioneer Funds Distributor, Inc. (PFD), the principal underwriter for the Fund, earned $4,641 in underwriting commissions on the sale of Class A shares during the six months ended May 31, 2017. 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). 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 34 Pioneer International Equity Fund | Semiannual Report | 5/31/17 experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. These conditions may continue, recur, worsen or spread. Investing in foreign and/or emerging markets securities involves risks relating to interest rates, currency exchange rates and economic and political conditions. The Fund may invest a substantial amount of its assets in issuers located in a limited number of countries and therefore is susceptible to adverse economic, political or regulatory developments affecting those countries. At times, the Fund's investments may represent industries or industry sectors that are interrelated or have common risks, making the Fund more susceptible to any economic, political, or regulatory developments or other risks affecting those industries and sectors. The Fund's prospectus contains unaudited information regarding the Fund's principal risks. Please refer to that document when considering the Fund's principal risks. 2. Management Agreement Amundi Pioneer, formerly PIM manages the Fund's portfolio. Management fees are calculated daily at the annual rate of 0.85% of the Fund's average daily net assets up to $500 million and 0.75% of the excess over $500 million. For the six months ended May 31, 2017, the effective management fee (excluding waivers and/or assumptions of expenses) was equivalent to 0.85% of the Fund's average daily net assets. Amundi Pioneer, formerly PIM, contractually agreed to limit ordinary operating expenses to the extent required to reduce Fund expenses to 1.45% and 2.35%, of the average daily net assets attributable to Class A and Class C shares, respectively. These expense limitations are in effect through April 1, 2018. There can be no assurance that Amundi Pioneer, formerly PIM, will extend the expense limitation agreement for a class of shares beyond the date referred to above. Fees waived and expenses reimbursed during the six months ended May 31, 2017 are reflected on the Statement of Operations. Class Y shares do not have an expense limitation. 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 $141,513 in management fees, administrative costs and certain other reimbursements payable to Amundi Pioneer, formerly PIM, at May 31, 2017. Pioneer International Equity Fund | Semiannual Report | 5/31/17 35 3. Transfer Agent Boston Financial Data Services, 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 shareholder communications activities such as proxy and statement mailings and outgoing phone calls. For the six months ended May 31, 2017, such out-of-pocket expenses by class of shares were as follows: -------------------------------------------------------------------------------- Shareholder Communications: -------------------------------------------------------------------------------- Class A $50,626 Class C 6,631 Class Y 238 -------------------------------------------------------------------------------- Total $57,495 ================================================================================ 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 Amundi Pioneer Distributor, Inc., formerly PFD, 0.25% of the average daily net assets attributable to Class A shares as compensation for personal services and/or account maintenance services or distribution services with regard to Class A shares. Pursuant to the Plan, the Fund also pays Amundi Pioneer Distributor, Inc., formerly PFD, 1.00% of the average daily net assets attributable to Class C shares. The fee for Class C shares consists of a 0.25% service fee and a 0.75% distribution fee paid as compensation for personal services and/or account maintenance services or distribution services with regard to Class C shares. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $27,696 in distribution fees payable to Amundi Pioneer Distributor, Inc., formerly PFD, at May 31, 2017. 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 36 Pioneer International Equity Fund | Semiannual Report | 5/31/17 are paid to Amundi Pioneer Distributor, Inc., formerly PFD. For the six months ended May 31, 2017, CDSCs in the amount of $1,289 were paid to Amundi Pioneer Distributor, Inc., formerly PFD. 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. The credit facility in which the Fund participated until February 9, 2016 was in the amount of $240 million. The credit facility in which the fund participated until February 7, 2017 was in the amount of $220 million. Effective February 8, 2017, the Fund participates in a facility that is in the amount of $25 million. Under such facility, depending on the type of loan, interest on borrowings is payable at the London Interbank Offered Rate (LIBOR) plus 0.85% on an annualized basis, or the Alternate Base Rate, which is the greater of (a) the facility's administrative agent's daily announced prime rate on the borrowing date, (b) 2% plus the Federal Funds Rate on the borrowing date and (c) 2% plus the overnight 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 six months ended May 31, 2017, the Fund had no borrowings under the credit facility. Pioneer International Equity Fund | Semiannual Report | 5/31/17 37 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, including the Fund's two most recent fiscal years preceding the fiscal year ended June 30, 2017, 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 a new independent registered public accounting firm, Ernst & Young LLP ("EY"), for the Fund's fiscal year ended June 30, 2017. 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 38 Pioneer International Equity Fund | Semiannual Report | 5/31/17 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 advisor 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 International Equity Fund | Semiannual Report | 5/31/17 39 Approval of New and Interim Management Agreements Amundi Pioneer Asset Management, Inc. (Amundi Pioneer), formerly Pioneer Investment Management, Inc., serves as the investment adviser to Pioneer International Equity Fund (the Fund) pursuant to an investment management agreement between Amundi Pioneer and the Fund. On July 3, 2017, Amundi acquired Pioneer Investments, a group of asset management companies located throughout the world (the "Transaction"). As a result of the Transaction, Amundi Pioneer became an indirect wholly-owned subsidiary of Amundi and Amundi's wholly-owned subsidiary, Amundi USA, Inc. Prior to July 3, 2017, Pioneer Investments was owned by Pioneer Global Asset Management S.p.A. ("PGAM"), a wholly-owned subsidiary of UniCredit S.p.A. ("UniCredit"). Under the Investment Company Act of 1940, the Fund's current investment management agreement (the "Current Management Agreement") terminated automatically upon the consummation of the Transaction. In order for Amundi Pioneer to continue to manage the Fund after the consummation of the Transaction, the Trustees and shareholders of the Fund were required to approve a new investment management agreement for the Fund (the "New Management Agreement"). As discussed below, the Board of Trustees of the Fund approved the New Management Agreement at a meeting held on March 6-7, 2017. The New Management Agreement was approved by the shareholders of the Fund at a meeting held on June 13, 2017. The Board of Trustees of the Fund also approved an interim investment management agreement between Amundi Pioneer and the Fund (the "Interim Management Agreement") at the March 6-7, 2017 meeting. The Interim Management Agreement would have taken effect upon the closing of the Transaction in the event that the shareholders of the Fund did not approve the New Management Agreement. Board Evaluation of the New and Interim Management Agreements The Board evaluated the Transaction and the New Management Agreement and Interim Management Agreement for the Fund. In connection with their evaluation of the Transaction and the New Management Agreement for the Fund, the Trustees requested such information as they deemed reasonably necessary, including: (a) the structure of the Transaction and the strategy underlying the Transaction; (b) the anticipated benefits of the Transaction to the Fund and its shareholders; (c) the post-Transaction plans for Amundi Pioneer, including Amundi's plans for integration of Pioneer Investments and Amundi Pioneer with its existing asset management businesses and plans for the future development of Amundi Pioneer; (d) the effect of the Transaction on the ongoing services provided to the Fund, including the need to select a new independent registered public accounting firm for the Fund, and any 40 Pioneer International Equity Fund | Semiannual Report | 5/31/17 plans to modify the operations of the Fund; (e) the stability and continuity of Amundi Pioneer's management and key employees, including compensation and benefits to Amundi Pioneer's key employees, and retention plans and incentive plan structure; (f) the post-Transaction indebtedness and financial resources of Amundi Pioneer; (g) Amundi's legal and operational structure, its principal shareholders and senior management, its investment management, risk management, administrative, legal and compliance functions; (h) certain regulatory matters relating to Amundi's affiliates; and (i) Amundi's commitment to the United States, including the role of Amundi Pioneer in the larger Amundi business. The Trustees also requested and obtained the following information in connection with their evaluation of the Transaction and the New Management Agreement for the Fund: (i) memoranda provided by Fund counsel that summarized the legal standards and other considerations that are relevant to the Trustees in their deliberations regarding the New Management Agreement; (ii) 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; (iii) the Fund's management fees and total expense ratios, the financial statements of Amundi Pioneer and its pre- and post-Transaction parent companies, profitability analyses from Amundi Pioneer, and analyses from Amundi Pioneer as to possible economies of scale; (iv) the profitability of the institutional business of Amundi Pioneer and Amundi Pioneer's affiliate, Amundi Pioneer Institutional Asset Management, Inc. ("Amundi Pioneer Institutional") as compared to that of Amundi Pioneer's fund management business; and (v) the differences between the fees and expenses of the Fund and the fees and expenses of Amundi Pioneer's and Amundi Pioneer Institutional's institutional accounts, as well as the different services provided by Adviser to the Fund and by Amundi Pioneer and Amundi Pioneer Institutional to the institutional accounts. In addition, the Trustees considered the information provided at regularly scheduled meetings throughout the year regarding the Fund's performance and risk attributes, including through meetings with investment management personnel, and took into account other information related to the Fund provided to the Trustees at regularly scheduled meetings. The Trustees also considered information they had received in their review of the continuance of the Current Management Agreement for the Fund in September 2016. At meetings held on January 9, 2017 and January 10, 2017, the Trustees met with representatives of Amundi and PGAM, including separate meetings of the Trustees who are not "interested persons" of the Fund Complex ("Independent Trustees") and counsel with representatives of Amundi and PGAM, and subsequently with representatives of Amundi. In those meetings, they received an extensive presentation from the representatives of Amundi, including the chief executive officer of Amundi, describing Amundi's Pioneer International Equity Fund | Semiannual Report | 5/31/17 41 background and history, its global asset management activities, the growth of its business, and its status as the largest asset management firm in Europe and one of the largest globally; its capital structure and financial resources, including information as to the financing of the Transaction; its principal investors, including its majority investor Credit Agricole S.A., and Credit Agricole's long-term commitment to the asset management business; the philosophy and strategy underlying the Transaction and the complementarity of Amundi's and Pioneer Investments' respective asset management businesses; Amundi's various operating and investment committees and how they would likely interact with Amundi Pioneer; the proposed integration process, including the progress to date and the establishment of various integration work streams; Amundi's plans for management of Amundi Pioneer; Amundi's philosophy as to compensation of key employees and its general intentions with respect to incentive plans for key employees of Amundi Pioneer; Amundi's preliminary plans to achieve cost and other synergies; and opportunities to further develop the business of Amundi Pioneer and Amundi Pioneer Institutional, including in the area of institutional asset management, and how that would benefit shareholders of the Pioneer Funds. In those meetings, the representatives of Amundi confirmed their intention that the Chief Executive Officer and Chief Investment Officer of Amundi Pioneer would remain in their current positions, and confirmed that they do not currently foresee major changes in the day-to-day investment management operations of Amundi Pioneer with respect to the Fund as a direct result of the Transaction. They discussed incentive arrangements for key personnel that would continue after the closing of the Transaction and their plans to establish a new long-term incentive plan following the closing. They also generally discussed ways in which Amundi Pioneer could potentially draw on the expanded global resources of Amundi post-Transaction. At those meetings, the Independent Trustees identified certain areas to which they requested further information, including as to trading and execution of securities transactions, research and portfolio management and potential changes in investment process, particularly where asset classes managed by Amundi Pioneer would overlap with asset classes managed by Amundi, the continued availability of resources currently at Pioneer Investments or elsewhere within Amundi to assist in management of certain Funds, and any anticipated significant changes in operations. The Independent Trustees considered the uncertainty as to whether the Fund's independent registered public accounting firm could continue to act in that capacity after the closing of the Transaction. The Independent Trustees also met with counsel to review the information they had received to date and to discuss next steps. Subsequently, the Trustees received further information from Amundi, including written responses to questions raised by the Independent Trustees, and received from Amundi Pioneer the information requested of it. The 42 Pioneer International Equity Fund | Semiannual Report | 5/31/17 Independent Trustees reviewed the information provided with counsel at telephonic meetings held on February 16, 2017 and February 27, 2017. The Trustees held a special in-person Board meeting on March 6-7, 2017 for further consideration of the New Management Agreements, the Interim Management Agreements and the Transaction. The Trustees met again with senior executives of Amundi at the March 6-7, 2017 meeting. At the March 6-7, 2017 meeting, based on their evaluation of the information provided by Amundi Pioneer and Amundi, the Trustees including the Independent Trustees voting separately, approved the New Management Agreement and the Interim Management Agreement for the Fund. In considering the New Management Agreement for the Fund, 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 their determinations. The Trustees considered the same factors with respect to the Interim 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 Amundi Pioneer to the Fund and that are expected to be provided by Amundi Pioneer to the Fund following the consummation of the Transaction. The Trustees reviewed the terms of the New Management Agreement, and noted that such terms are substantially similar to the terms of the Current Management Agreement, except for different execution dates, effective dates and termination dates. The Trustees reviewed Amundi Pioneer's investment approach for the Fund and its research process. The Trustees considered the resources of Amundi Pioneer and the personnel of Amundi Pioneer who provide investment management services to the Fund. They also reviewed the amount of non-investment resources and personnel of Amundi Pioneer that are involved in Amundi Pioneer's services to the Fund, including Amundi Pioneer's compliance and legal resources and personnel. The Trustees noted the substantial attention and high priority given by Amundi Pioneer's senior management to the Pioneer Fund complex. The Trustees considered that Amundi Pioneer 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 and that Amundi Pioneer would continue to provide those investment management and research services and resources to the Fund following the consummation of the Transaction. The Trustees also considered that, as administrator, Amundi Pioneer would continue to be responsible for the administration of the Fund's business and other affairs. The Trustees considered the fees to be paid to Amundi Pioneer for the provision of administration services. Pioneer International Equity Fund | Semiannual Report | 5/31/17 43 The Trustees considered that Deloitte & Touche LLP informed the Board that it would no longer be independent with respect to the Fund upon the completion of the Transaction and, accordingly, that it would be necessary for the Board to engage a new independent registered public accounting firm for the Fund. The Trustees considered that the Transaction was not expected to have a material adverse impact on the nature, scope and overall quality of services provided to the Fund and its shareholders, including investment management, risk management, administrative, compliance, legal and other services, as a result of the Transaction. In that regard, the Trustees considered that Amundi is one of the largest asset managers globally, and that Amundi Pioneer may have access to additional research and portfolio management capabilities as a result of the Transaction and that Amundi Pioneer, as part of Amundi, is expected to have an enhanced global presence that may contribute to an increase in the overall scale and resources of Amundi Pioneer. Furthermore, in considering whether the Transaction would be expected to have a material adverse impact on the nature, scope and overall quality of services provided to the Fund and its shareholders, the Trustees considered the statements by representatives of Amundi that they expect the Chief Executive Officer and Chief Investment Officer of Amundi Pioneer to remain in their current positions and that they do not currently foresee major changes in the day-to-day investment management operations of Amundi Pioneer as a direct result of the Transaction, or the risk management, legal or compliance services provided by Amundi Pioneer, with respect to the Fund. They further considered the current incentive arrangements for key personnel of Amundi Pioneer that would continue after the closing of the Transaction. They also noted Amundi's stated intention to establish a new long-term incentive plan following the closing. The Trustees also took into account their experience in evaluating the proposed combination of Pioneer Investments and Santander Asset Management, which was announced in September, 2014 and abandoned in July, 2016. In light of, among other things, this experience, the Trustees determined that they were not able to identify any realistic alternatives to approving the New Management Agreement that would provide the level of services to the Fund and its shareholders that are expected to be provided by Amundi Pioneer after the closing of the Transaction. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that Amundi Pioneer would continue to provide to the Fund under the New Management Agreement would be satisfactory and consistent with the terms of the New Management Agreement. 44 Pioneer International Equity Fund | Semiannual Report | 5/31/17 Performance of the Fund In considering the Fund's performance, the Trustees regularly reviewed and discussed throughout the year data prepared by Amundi Pioneer and information comparing the Fund's performance with the performance of its peer group of funds, as classified by each of Morningstar, Inc. (Morningstar) and Lipper, and the performance of the Fund's benchmark index. They also discussed the Fund's performance with Amundi Pioneer on a regular basis. The Trustees' regular reviews and discussions were factored into the Trustees' deliberations concerning the approval of the New Management Agreement. Management Fee and Expenses The Trustees noted that the stated management fees to be paid by the Fund are identical under the Current Management Agreement and the New Management Agreement. The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees and expense ratios of its peer group of funds as classified by Morningstar and also to the expense ratios of a peer group of funds selected on the basis of criteria determined by the Independent Trustees for this purpose using data provided by Strategic Insight Mutual Fund Research and Consulting, LLC (Strategic Insight), an independent third party. In all quintile rankings referred to below, first quintile is most favorable to the Fund's shareowners. To the extent applicable, the Trustees also considered the impact of transfer agency, sub-transfer agency, and other non-management fee expenses on the expense ratios of the Fund. The Trustees noted that they separately review the Fund's transfer agency, 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 as of September 30, 2016 was in the third quintile relative to the management fees paid by other funds in its Morningstar category for the comparable period. The Trustees also considered the breakpoint in the management fee schedule and the reduced fee rate above a certain asset level. The Trustees considered that the expense ratio of the Fund's Class A shares as of September 30, 2016 was in the fourth quintile relative to its Morningstar category and in the fourth quintile relative to its Strategic Insight peer group, in each case for the comparable period. The Trustees considered that the expense ratio of the Fund's Class Y shares as of September 30, 2016 was in the fourth quintile relative to its Morningstar category and in the fourth quintile relative to its Strategic Insight peer group, in each case for the comparable period. The Trustees noted that Amundi Pioneer had agreed to waive fees and/or reimburse expenses in order to limit the ordinary operating expenses of the Fund. The Trustees noted the Fund's relatively small asset size compared to most of the other funds in its Pioneer International Equity Fund | Semiannual Report | 5/31/17 45 peer groups. The Trustees noted the impact of expenses relating to small accounts and omnibus accounts on transfer and sub-transfer agency expenses generally. The Trustees considered that such non-management fee operating expenses generally are spread over a smaller asset base than the other funds in the peer group, which results in these fees being significantly higher as a percentage of assets. The Trustees reviewed management fees charged by Amundi Pioneer and Amundi Pioneer Institutional to institutional and other clients, including publicly offered European funds sponsored by Amundi Pioneer's affiliates, unaffiliated U.S. registered investment companies (in a sub-advisory capacity), and unaffiliated foreign and domestic separate accounts. The Trustees also considered Amundi Pioneer's costs in providing services to the Fund and Amundi Pioneer's and Amundi Pioneer Institutional'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 Amundi Pioneer's and Amundi Pioneer Institutional'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 both the Current Management Agreement and the New Management Agreement, Amundi Pioneer would perform additional services for the Fund that it does not provide to those other clients or services that are broader in scope, including oversight of the Fund's other service providers and activities related to compliance and the extensive regulatory and tax regimes to which the Fund is subject. The Trustees also considered the different risks associated with Amundi Pioneer's management of the Fund and Amundi Pioneer's and Amundi Pioneer Institutional's management of the other client accounts. The Trustees concluded that the management fee payable by the Fund to Amundi Pioneer was reasonable in relation to the nature and quality of the services to be provided by Amundi Pioneer. Profitability The Trustees considered information provided by Amundi Pioneer regarding the profitability of Amundi Pioneer with respect to the advisory services provided by Amundi Pioneer to the Fund, including the methodology used by Amundi Pioneer in allocating certain of its costs to the management of the Fund. The Trustees also considered Amundi Pioneer's profit margin in connection with the overall operation of the Fund. They further reviewed the financial results, including the profit margins, realized by Amundi Pioneer and Amundi Pioneer Institutional from non-fund businesses. The Trustees considered Amundi Pioneer's profit margins with respect to the Fund in 46 Pioneer International Equity Fund | Semiannual Report | 5/31/17 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 Amundi Pioneer's profitability with respect to the management of the Fund was not unreasonable. Economies of Scale The Trustees considered Amundi Pioneer'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 Amundi Pioneer in research and analytical capabilities and Amundi Pioneer'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 Amundi Pioneer 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 Current Management Agreement or the New Management Agreement, for services provided by Amundi Pioneer and its affiliates. The Trustees further considered the revenues and profitability of Amundi Pioneer's businesses other than the Fund business. To the extent applicable, the Trustees also considered the benefits to the Fund and to Amundi Pioneer 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 following the completion of the Transaction, Amundi Pioneer will be the principal U.S. asset management business of Amundi, and that Amundi's worldwide asset management business will manage over $1.38 trillion in assets (including the Pioneer Funds). This may create opportunities for Amundi Pioneer, Amundi Pioneer Institutional and Amundi that derive from Amundi Pioneer's relationships with the Fund, including Amundi's ability to market the services of Amundi Pioneer globally. The Trustees noted that Amundi Pioneer may have access to additional research capabilities as a result of the Transaction and Amundi's enhanced global presence that may contribute to an increase of the overall scale of Amundi Pioneer. The Trustees considered that Amundi Pioneer and the Fund are expected to receive reciprocal intangible benefits from the relationship, Pioneer International Equity Fund | Semiannual Report | 5/31/17 47 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 Amundi Pioneer 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 New Management Agreement and the Interim Management Agreement for the Fund, including the fees payable thereunder, were fair and reasonable and voted to approve the New Management Agreement and the Interim Management Agreement, and to recommend that shareholders approve the New Management Agreement. 48 Pioneer International Equity Fund | Semiannual Report | 5/31/17 Trustees, Officers and Service Providers Trustees Officers Thomas J. Perna, Chairman Lisa M. Jones, President and Chief David R. Bock Executive Officer Benjamin M. Friedman Mark E. Bradley, Treasurer and Margaret B.W. Graham Chief Financial Officer Lisa M. Jones Christopher J. Kelley, Secretary and Lorraine H. Monchak Chief Legal Officer Marguerite A. Piret Fred J. Ricciardi Kenneth J. Taubes Investment Adviser and Administrator Amundi Pioneer Asset Management, Inc., formerly Pioneer Investment Management, Inc. Custodian and Sub-Administrator Brown Brothers Harriman & Co. Principal Underwriter Amundi Pioneer Distributor, Inc., formerly Pioneer Funds Distributor, Inc. Legal Counsel Morgan, Lewis & Bockius LLP Shareowner Services and Transfer Agent Boston Financial Data Services, Inc. Proxy Voting Policies and Procedures of the Fund are available without charge, upon request, by calling our toll free number (1-800-225-6292). Information regarding how the Fund voted proxies relating to portfolio securities during the most recent 12-month period ended June 30 is publicly available to shareowners at www.amundipioneer.com. This information is also available on the Securities and Exchange Commission's web site at www.sec.gov. Pioneer International Equity Fund | Semiannual Report | 5/31/17 49 This page is for your notes. 50 Pioneer International Equity Fund | Semiannual Report | 5/31/17 This page is for your notes. Pioneer International Equity Fund | Semiannual Report | 5/31/17 51 This page is for your notes. 52 Pioneer International Equity Fund | Semiannual Report | 5/31/17 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 ask.amundipioneer@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 http://www.sec.gov. The filed form may also be viewed and copied at the Commission's Public Reference Room in Washington, DC. Information regarding the operations of the Public Reference Room may be obtained by calling 1-800-SEC-0330. [LOGO] 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) 2017 Amundi Pioneer Asset Management 19390-11-0717 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. N/A (b) Disclose, under the caption AUDIT-RELATED FEES, the aggregate fees billed in each of the last two fiscal years for assurance and related services by the principal accountant that are reasonably related to the performance of the audit of the registrant's financial statements and are not reported under paragraph (a) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A (c) Disclose, under the caption TAX FEES, the aggregate fees billed in each of the last two fiscal years for professional services rendered by the principal accountant for tax compliance, tax advice, and tax planning. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A (d) Disclose, under the caption ALL OTHER FEES, the aggregate fees billed in each of the last two fiscal years for products and services provided by the principal accountant, other than the services reported in paragraphs (a) through (c) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A (e) (1) Disclose the audit committee's pre-approval policies and procedures described in paragraph (c)(7) of Rule 2-01 of Regulation S-X. PIONEER FUNDS APPROVAL OF AUDIT, AUDIT-RELATED, TAX AND OTHER SERVICES PROVIDED BY THE INDEPENDENT AUDITOR SECTION I - POLICY PURPOSE AND APPLICABILITY The Pioneer Funds recognize the importance of maintaining the independence of their outside auditors. Maintaining independence is a shared responsibility involving Pioneer Investment Management, Inc ("PIM"), the audit committee and the independent auditors. The Funds recognize that a Fund's independent auditors: 1) possess knowledge of the Funds, 2) are able to incorporate certain services into the scope of the audit, thereby avoiding redundant work, cost and disruption of Fund personnel and processes, and 3) have expertise that has value to the Funds. As a result, there are situations where it is desirable to use the Fund's independent auditors for services in addition to the annual audit and where the potential for conflicts of interests are minimal. Consequently, this policy, which is intended to comply with Rule 210.2-01(C)(7), sets forth guidelines and procedures to be followed by the Funds when retaining the independent audit firm to perform audit, audit-related tax and other services under those circumstances, while also maintaining independence. Approval of a service in accordance with this policy for a Fund shall also constitute approval for any other Fund whose pre-approval is required pursuant to Rule 210.2-01(c)(7)(ii). In addition to the procedures set forth in this policy, any non-audit services that may be provided consistently with Rule 210.2-01 may be approved by the Audit Committee itself and any pre-approval that may be waived in accordance with Rule 210.2-01(c)(7)(i)(C) is hereby waived. Selection of a Fund's independent auditors and their compensation shall be determined by the Audit Committee and shall not be subject to this policy. SECTION II - POLICY ---------------- -------------------------------- ------------------------------------------------- SERVICE SERVICE CATEGORY DESCRIPTION SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES CATEGORY ---------------- -------------------------------- ------------------------------------------------- I. AUDIT Services that are directly o Accounting research assistance SERVICES related to performing the o SEC consultation, registration independent audit of the Funds statements, and reporting o Tax accrual related matters o Implementation of new accounting standards o Compliance letters (e.g. rating agency letters) o Regulatory reviews and assistance regarding financial matters o Semi-annual reviews (if requested) o Comfort letters for closed end offerings ---------------- -------------------------------- ------------------------------------------------- II. Services which are not o AICPA attest and agreed-upon procedures AUDIT-RELATED prohibited under Rule o Technology control assessments SERVICES 210.2-01(C)(4) (the "Rule") o Financial reporting control assessments and are related extensions of o Enterprise security architecture the audit services support the assessment audit, or use the knowledge/expertise gained from the audit procedures as a foundation to complete the project. In most cases, if the Audit-Related Services are not performed by the Audit firm, the scope of the Audit Services would likely increase. The Services are typically well-defined and governed by accounting professional standards (AICPA, SEC, etc.) ---------------- -------------------------------- ------------------------------------------------- ------------------------------------- ------------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the audit period for all services and related fees pre-approved specific service reported at each regularly subcategories. Approval of the scheduled Audit Committee independent auditors as meeting. auditors for a Fund shall constitute pre approval for these services. ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the fund fiscal year within services and related fees a specified dollar limit (including comparison to for all pre-approved specified dollar limits) specific service subcategories reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limit for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for Audit-Related Services not denoted as "pre-approved", or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------------------ SECTION III - POLICY DETAIL, CONTINUED ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- --------------------------- ----------------------------------------------- III. TAX SERVICES Services which are not o Tax planning and support prohibited by the Rule, o Tax controversy assistance if an officer of the Fund o Tax compliance, tax returns, excise determines that using the tax returns and support Fund's auditor to provide o Tax opinions these services creates significant synergy in the form of efficiency, minimized disruption, or the ability to maintain a desired level of confidentiality. ----------------------- --------------------------- ----------------------------------------------- ------------------------------------- ------------------------- AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------- ------------------------------------- ------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year all such services and within a specified dollar limit related fees 				 (including comparison 			 to specified dollar 			 limits) reported 			 quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for tax services not denoted as pre-approved, or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------- SECTION III - POLICY DETAIL, CONTINUED ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- --------------------------- ----------------------------------------------- IV. OTHER SERVICES Services which are not o Business Risk Management support prohibited by the Rule, o Other control and regulatory A. SYNERGISTIC, if an officer of the Fund compliance projects UNIQUE QUALIFICATIONS determines that using the Fund's auditor to provide these services creates significant synergy in the form of efficiency, minimized disruption, the ability to maintain a desired level of confidentiality, or where the Fund's auditors posses unique or superior qualifications to provide these services, resulting in superior value and results for the Fund. ----------------------- --------------------------- ----------------------------------------------- --------------------------------------- ------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- -------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year within all such services and a specified dollar limit related fees 			 (including comparison 			 to specified dollar 				 limits) reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for "Synergistic" or "Unique Qualifications" Other Services not denoted as pre-approved to the left, or to add a specific service subcategory as "pre-approved" ------------------------------------- -------------------------- SECTION III - POLICY DETAIL, CONTINUED ----------------------- ------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PROHIBITED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- ------------------------- ----------------------------------------------- PROHIBITED SERVICES Services which result 1. Bookkeeping or other services in the auditors losing related to the accounting records or independence status financial statements of the audit under the Rule. client* 2. Financial information systems design and implementation* 3. Appraisal or valuation services, fairness* opinions, or contribution-in-kind reports 4. Actuarial services (i.e., setting actuarial reserves versus actuarial audit work)* 5. Internal audit outsourcing services* 6. Management functions or human resources 7. Broker or dealer, investment advisor, or investment banking services 8. Legal services and expert services unrelated to the audit 9. Any other service that the Public Company Accounting Oversight Board determines, by regulation, is impermissible ----------------------- ------------------------- ----------------------------------------------- ------------------------------------------- ------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------------- ------------------------------ o These services are not to be o A summary of all performed with the exception of the(*) services and related services that may be permitted fees reported at each if they would not be subject to audit regularly scheduled procedures at the audit client (as Audit Committee meeting defined in rule 2-01(f)(4)) level will serve as continual the firm providing the service. confirmation that has 				 not provided any restricted services. ------------------------------------------- ------------------------------ -------------------------------------------------------------------------------- GENERAL AUDIT COMMITTEE APPROVAL POLICY: o For all projects, the officers of the Funds and the Fund's auditors will each make an assessment to determine that any proposed projects will not impair independence. o Potential services will be classified into the four non-restricted service categories and the "Approval of Audit, Audit-Related, Tax and Other Services" Policy above will be applied. Any services outside the specific pre-approved service subcategories set forth above must be specifically approved by the Audit Committee. o At least quarterly, the Audit Committee shall review a report summarizing the services by service category, including fees, provided by the Audit firm as set forth in the above policy. -------------------------------------------------------------------------------- (2) Disclose the percentage of services described in each of paragraphs (b) through (d) of this Item that were approved by the audit committee pursuant to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X. N/A (f) If greater than 50 percent, disclose the percentage of hours expended on the principal 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. N/A (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. 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 VIII By (Signature and Title)* /s/ Lisa M. Jones Lisa M. Jones, President & Chief Executive Officer Date July 28, 2017 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 July 28, 2017 By (Signature and Title)* /s/ Mark E. Bradley Mark E. Bradley, Treasurer & Chief Accounting & Financial Officer Date July 28, 2017 * Print the name and title of each signing officer under his or her signature.