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 811-08547 Pioneer Series Trust XII (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: August 31 Date of reporting period: September 1, 2016 through Feburary 28, 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 Disciplined Growth Fund -------------------------------------------------------------------------------- Semiannual Report | February 28, 2017 -------------------------------------------------------------------------------- Ticker Symbols: Class A PINDX Class C INDCX Class Y INYDX [LOGO] PIONEER Investments(R) visit us: us.pioneerinvestments.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 20 Notes to Financial Statements 27 Approval of Investment Advisory Agreement 35 Trustees, Officers and Service Providers 40 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 1 President's Letter Dear Shareowner, The 2016 calendar year featured many swings in market sentiment, both in the equity and fixed-income markets. After a slow start to the year, the markets began to rally in mid-February 2016 with a recovery in the prices of oil and other commodities, as well as slow, positive progress in US employment figures. The rally persisted throughout much of the remaining 10 months of 2016, gaining further momentum in the second half of the year when US gross domestic product (GDP) growth showed solid improvement during the third quarter and unemployment continued to decline. Finally, in November, the election of Donald Trump as the 45th President of the United States sparked a dramatic late-year market upturn that saw US equities briefly climb to all-time highs. Speculation that the new Trump administration's policies would stimulate the US economy through reduced taxes, less regulation, and increased government spending on infrastructure, fueled the year-end rally. For the full 12 months ended December 31, 2016, the Standard & Poor's 500 Index, a broad measure of US stock market performance, returned a strong 11.9%. In bond markets, the Federal Reserve Board's (the Fed's) 0.25% hike in the Federal funds rate in December 2016, its first rate increase in a year, contributed to a sell-off in US Treasuries. The pullback from Treasuries also derived from the market's increased inflation and growth expectations under the incoming Trump administration. Elsewhere within fixed income, corporate credit, particularly in the high-yield segment of the market, performed well over the fourth quarter and the full calendar year. US high-yield securities, as measured by the Bank of America Merrill Lynch US High Yield Index, returned a robust 17.5% for the 12 months ended December 31, 2016. The debt of energy-related issuers drove the strong performance within high yield, as the recovery in oil and other commodity prices, which began in February 2016, sparked a rally in the sector. Meanwhile, the Bloomberg Barclays US Aggregate Bond Index, which tracks the performance of Treasury and agency issues, corporate bond issues, and mortgage-backed securities, returned 2.7% for the same 12-month period, reflecting the relative weakness in government bonds. The US economy's underlying fundamentals seem solid, and growth prospects for 2017 appear healthy. However, we remain concerned about risks to the economy of potentially disruptive trade policies pursued by the Trump administration. Barring a damaging trade war, though, we anticipate the Fed will continue to hike short-term interest rates gradually during 2017. In addition, we expect the Fed to consider carefully the potential economic effects of any fiscal policies enacted by the new Trump administration and the Republican-controlled Congress. In that regard, we believe President Trump's economic policies, if they come to fruition, could help boost real GDP growth. However, the impact of Trump's policies on US GDP may be greater in 2018 rather than in 2017. Still, even prior to the late-year "Trump rally," US GDP growth appeared to settling in at a sustainable annual pace of more than 2% as 2016 drew to a close, following some weaker performance in the first half of the year. Continued improvement in the employment market driven in part by gains in manufacturing output were among the factors behind the bounce-back in GDP. 2 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 While economic conditions inside the US appear solid, many economies around the world continue to experience slow growth rates. Moreover, several countries in various regions face a number of challenges in 2017 and beyond, including the shifting geopolitics driving "Brexit" - the United Kingdom's pending exit from the European Union - as well as related populist movements in Europe, limited productivity gains, aging populations, and transitioning economic models in China and other emerging markets. In recent years, global central banks have kept interest rates at close to zero in an effort to stimulate economic growth. While financial markets often benefited from the low rates, it now appears that those policies may be losing their effectiveness, leaving central banks little room to maneuver going forward. Moreover, the low interest rates have caused government bond yields to plummet, presenting a dilemma for the income-oriented investor. Against this backdrop of still-low global interest rates, shifting priorities of central banks, evolving demographics, and numerous geopolitical concerns, we believe investors are likely to face ongoing challenges and much uncertainty when it comes to finding opportunities for both income and capital appreciation. While much has been made of passive investing as a possible source of stability in this uncertain environment, it is our view that all investment decisions are active choices. Throughout Pioneer's history, we have believed in the importance of active management. During challenging market conditions, we view the value of active management as even more compelling. Our experienced and tenured investment teams focus 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 President and CEO Pioneer Investment Management USA Inc. February 28, 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 Disciplined Growth Fund | Semiannual Report | 2/28/17 3 Portfolio Management Discussion | 2/28/17 The domestic equity market produced impressive gains during the six-month period ended February 28, 2017, as stocks staged a robust rally following the November 2016 elections. In the following interview, Craig D. Sterling discusses the factors that affected the performance of Pioneer Disciplined Growth Fund during the six-month period. Mr. Sterling, Head of Equity Research, a senior vice president and a portfolio manager at Pioneer, is responsible for the day-to-day management of the Fund, along with Paul Cloonan, a senior vice president and a portfolio manager at Pioneer, and Ashesh (Ace) Savla, a vice president and Head of U.S. Equity Quantitative Research at Pioneer. Q How did the Fund perform during the six-month period ended February 28, 2017? A Pioneer Disciplined Growth Fund's Class A shares returned 6.80% at net asset value during the six-month period ended February 28, 2017, while the Fund's benchmark, the Russell 1000 Growth Index (the Russell Index), returned 9.15%. During the same period, the average return of the 689 mutual funds in Lipper's Large-Cap Growth Funds category was 7.35%, and the average return of the 1,489 mutual funds in Morningstar's Large Growth category was 7.84%. Q How would you describe the investment environment in the equity market during the six-month period ended February 28, 2017? A When the reporting period began in September 2016, global equity markets had already bounced back strongly from the negative, but brief fallout driven by the June 2016 "Brexit" vote in the United Kingdom. As the period progressed, uncertainty surrounding the U.S. presidential election also weighed on the markets as investors grappled with the potential effects that the election results might have on global economic growth. However, with non-U.S. central banks committed to policies aimed at propping up economic growth in their respective countries and regions, coupled with signs that the U.S. economy was gathering strength, market sentiment steadily improved. After Donald Trump's election in November 2016, speculation that tax reform, more infrastructure spending, and deregulation would be important policy initiatives during his presidency spurred renewed investor optimism, and, by year-end, major U.S. stock market indices had reached all-time highs. In December, the U.S. Federal Reserve (the Fed), in response to stronger economic data, increased the key Federal funds rate by 0.25% and suggested that multiple, additional rate hikes were on the table for 2017. 4 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 In that environment, U.S. stocks delivered very positive performance during the six-month period, returning 10.01% as measured by the Standard & Poor's 500 Index (the S&P 500). Meanwhile, growth stocks, as measured by the Fund's benchmark, the Russell Index, returned 9.15%. Q What were the main reasons for the Fund's underperformance of the Russell Index during the six-month period ended February 28, 2017? A The Fund delivered a healthy absolute return during the six-month period, but lagged the performance of the benchmark Russell Index in the sharp market rally that began in the aftermath of the 2016 U.S. elections, which raised investor hopes that corporate earnings would increase with the enactment of more pro-growth economic policies. Stock selection results were the main reason for the Fund's underperformance of its benchmark during the period. The single biggest drag on the Fund's benchmark-relative performance was a position in auto parts retailer O'Reilly Automotive, followed by positions in courier United Parcel Service (UPS), medical device company Edwards Lifesciences, diversified health care corporation Johnson & Johnson, financial market exchange company IntercontinentalExchange, and packaging company Sealed Air. O'Reilly Automotive had been one of the Fund's strongest performers in 2015, as its convenient locations and superior business model made it a leader in auto parts retail, a segment of the retail industry that has been relatively less vulnerable to encroachment by internet-based competitors. However, O'Reilly's high stock price made it less attractive in 2016, as investors grew concerned that rising gasoline prices appeared to be leading to declines in the number of miles driven, which is an important indicator of demand for auto parts (i.e., more accidents). Although we continue to consider O'Reilly a well-managed company with an impressive competitive position, we sold the Fund's shares in the wake of the recent difficulties and a less-compelling valuation. The performance of Edwards Lifesciences, a medical-device company specializing in heart valve systems, lagged during the period due to speculation that profits from its Trans-catheter Aortic Valve Replacement (TAVR) product might fall short of lofty expectations. Johnson & Johnson's share price weakened when it announced acquisition plans that worried investors, who felt the move suggested an unanticipated departure from the company's previous strategy. We liquidated the Fund's positions in both Edwards and Johnson & Johnson. In contrast, we have maintained the Fund's positions in UPS, IntercontinentalExchange, and Sealed Air, despite the fact that each stock produced disappointing share-price performance during the period. UPS Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 5 underperformed during the period after announcing that it planned to increase capital spending to meet peak holiday demand, which raised concerns about the company's ability to execute its strategy successfully, given that e-commerce continues to expand and internet-commerce company Amazon.com is developing its own logistics system. However, we continue to believe that UPS has a sustained competitive position in e-commerce, and that the shares do not properly reflect that position or the company's ability to continue to generate solid economic profit. IntercontinentalExchange (ICE), which operates financial exchanges and offers clearing & risk management as well as a comprehensive set of data and technology solutions, apparently fell out of favor with the market when more cyclical, less defensive stocks attracted investors. Despite the recent setback, ICE continues to have a unique competitive position, and we are confident the market will continue to reward the company's shares as it monetizes its market power. Sealed Air, which makes product and food care packaging solutions, encountered delays in selling its Diversey industrial cleaning business, causing the market to lose patience. We still believe in the longer-term prospects for all three companies. Q What were some of the notable positive contributors to the Fund's benchmark-relative performance during the six-month period ended February 28, 2017? A The Fund's sector positioning had a positive impact on benchmark-relative results during the period. In particular, our avoidance of real estate-related stocks, an overweight in financials, and the portfolio's relative underexposure to the health care sector benefited relative performance. The individual Fund investment with the greatest positive influence on benchmark-relative performance was a position in diversified financial services company Charles Schwab, followed by investments in semiconductor corporation Micron Technology, managed care companies Aetna and Humana, intermodal transportation company J.D. Hunt, and internet retailer Amazon.com. Charles Schwab, whose operations include discount brokerage, wealth management, and a bank, has gained a dominant position in its businesses. During the past six months, Schwab outperformed as investors recognized the potential of its ability to transfer sweep-cash from money markets to its bank. Schwab has also developed a unique advisory business that we believe can increase the company's assets under management. In addition, we believe Schwab should benefit from rising interest rates and potentially declining corporate tax rates under the new administration. Micron Technology, a leader in dynamic random-access memory (DRAM) 6 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 technologies, saw strong demand for its products during the period. We sold the Fund's Micron position after it had doubled in value, which raised concerns that the stock was approaching full price. In health care, we had invested the Fund in Aetna and Humana after our research indicated that managed care insurance providers would benefit as health care delivery systems in the U.S. continued to evolve. While we took profits and sold the Fund's investment in Aetna, we have maintained the portfolio's exposure to Humana, which has gained a leadership position in the health care market for retirees with its Medicare Advantage plans. Indeed, we think Humana's Medicare Advantage is the most attractive segment in the managed care industry. Transportation firm J.B. Hunt's earnings rose as pricing for trucking services finally began to trough after a period of extended weakness. Like many of the Fund's other holdings, J.B. Hunt's domestic orientation also would make it a primary beneficiary of any future decreases in corporate tax rates in the United States. Finally, Amazon.com fared well during the period as the company maintained its rapid expansion pace in internet- based retailing, and its dominant position in cloud information technology services. Q Did the Fund have any investments in derivative securities during the six-month period ended February 28, 2017? A No. The Fund had no exposure to any derivatives during the period. Q What is your investment outlook? A We are relatively confident in the outlook for U.S. stocks, even after the big rally that began in the wake of the November 2016 national elections. We think the economy should continue to grow at a moderate pace, providing a good backdrop for the expansion of corporate earnings. We continue to expect U.S. gross domestic product (GDP) to grow at a rate between 2% and 3% in 2017, led by consumer spending, a recovery in the industrial economy, and a modest increase in government spending. In our investment process for the Fund, we remain focused on bottom-up analysis, using company-specific research and our own propriety financial models to examine the potential for corporate profitability, and to evaluate that potential in a company's current market price. We intend to maintain our emphasis on identifying companies that are potential winners from longer-term secular changes in the economy. In information technology, for example, we have built up Fund positions in market-leading companies that appear able to fulfill the potential of Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 7 cloud-based processing, including Microsoft, Google, and Amazon. However, we also remain alert for the development of any cyclical trends that may favor specific companies. For example, in the retail industry, we have built up Fund positions in companies currently benefiting from the growing popularity of home repair and remodeling, including hardware chain Home Depot, building products corporation Masco, and paint corporation Sherwin Williams. Please refer to the Schedule of Investments on pages 16-19 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. The Fund invests in a limited number of securities and, as a result, the Fund's performance may be more volatile than the performance of other funds holding more securities. Investments in small and mid-sized companies may offer the potential for higher returns, but are also subject to greater short-term price fluctuations than larger, more established companies. 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 and sectors. These risks may increase share price volatility. Before investing, consider the product's investment objectives, risks, charges and expenses. Contact your advisor or Pioneer Investments 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 Disciplined Growth Fund | Semiannual Report | 2/28/17 Portfolio Summary | 2/28/17 Portfolio Diversification -------------------------------------------------------------------------------- (As a percentage of total investment portfolio) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] U.S. Common Stocks 96.0% Depositary Receipts for International Stocks 4.0% Sector Distribution -------------------------------------------------------------------------------- (As a percentage of equity holdings) [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Information Technology 36.8% Consumer Discretionary 16.4% Industrials 12.0% Health Care 11.4% Consumer Staples 8.4% Financials 7.0% Materials 4.8% Telecommunication Services 1.7% Energy 1.5% 10 Largest Holdings -------------------------------------------------------------------------------- (As a percentage of equity holdings)* 1. Apple, Inc. 7.62% -------------------------------------------------------------------------------- 2. Microsoft Corp. 5.39 -------------------------------------------------------------------------------- 3. Amazon.com, Inc. 5.05 -------------------------------------------------------------------------------- 4. Visa, Inc. 4.71 -------------------------------------------------------------------------------- 5. Illinois Tool Works, Inc. 4.56 -------------------------------------------------------------------------------- 6. The Home Depot, Inc. 4.11 -------------------------------------------------------------------------------- 7. Alphabet, Inc. (Class A) 4.03 -------------------------------------------------------------------------------- 8. Intercontinental Exchange, Inc. 3.91 -------------------------------------------------------------------------------- 9. Taiwan Semiconductor Manufacturing Co., Ltd. 3.91 -------------------------------------------------------------------------------- 10. Alphabet, Inc. (Class C) 3.51 -------------------------------------------------------------------------------- * This list excludes temporary cash investments and derivative instruments. The portfolio is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any securities listed. Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 9 Prices and Distributions | 2/28/17 Net Asset Value per Share -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 2/28/17 8/31/16 -------------------------------------------------------------------------------- A $17.24 $17.53 -------------------------------------------------------------------------------- C $15.67 $16.08 -------------------------------------------------------------------------------- Y $17.56 $17.86 -------------------------------------------------------------------------------- Distributions per Share: 9/1/16-2/28/17 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains -------------------------------------------------------------------------------- A $0.0431 $ -- $1.3539 -------------------------------------------------------------------------------- C $ -- $ -- $1.3539 -------------------------------------------------------------------------------- Y $0.0853 $ -- $1.3539 -------------------------------------------------------------------------------- The Russell 1000 Growth Index is an unmanaged measure of the performance of large-cap U.S. growth 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 Disciplined Growth Fund | Semiannual Report | 2/28/17 Performance Update | 2/28/17 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 Disciplined Growth Fund at public offering price during the periods shown, compared to that of the Russell 1000 Growth Index. Average Annual Total Returns (As of February 28, 2017) -------------------------------------------------------------------------------- Net Public Russell Asset Offering 1000 Value Price Growth Period (NAV) (POP) Index -------------------------------------------------------------------------------- 10 Years 8.26% 7.63% 9.07% 5 Years 12.09 10.76 13.79 1 Year 16.50 9.81 22.15 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 31, 2016) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 1.13% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Disciplined Russell 1000 Growth Fund Growth Index 2/07 $ 9,425 $10,000 2/08 $ 9,618 $10,040 2/09 $ 5,816 $ 6,021 2/10 $ 8,760 $ 9,283 2/11 $11,081 $11,599 2/12 $11,787 $12,483 2/13 $12,818 $13,681 2/14 $16,492 $17,668 2/15 $19,037 $20,537 2/16 $17,899 $19,500 2/17 $20,853 $23,819 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. NAV results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. POP returns reflect deduction of maximum 5.75% sales charge. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The 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. The Fund acquired the assets and liabilities of Pioneer Disciplined Growth Fund ("the predecessor fund") on June 7, 2013. As a result of the reorganization, the predecessor fund's performance and financial history became the performance and financial history of the Fund. The performance of Class A shares of the Fund is the performance of Class A shares of the predecessor fund for periods prior to the reorganization, and has not been restated to reflect any differences in expenses. Please refer to the financial highlights for a more current expense ratio. Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 11 Performance Update | 2/28/17 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 Disciplined Growth Fund during the periods shown, compared to that of the Russell 1000 Growth Index. Average Annual Total Returns (As of February 28, 2017) -------------------------------------------------------------------------------- Russell 1000 If If Growth Period Held Redeemed Index -------------------------------------------------------------------------------- Life of Class (7/16/08) 9.18% 9.18% 10.75% 5 Years 11.13 11.13 13.79 1 Year 15.49 15.49 22.15 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 31, 2016) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 1.98% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Disciplined Russell 1000 Growth Fund Growth Index 7/08 $10,000 $10,000 2/09 $ 6,356 $ 6,074 2/10 $ 9,490 $ 9,366 2/11 $11,896 $11,702 2/12 $12,541 $12,594 2/13 $13,515 $13,803 2/14 $17,245 $17,825 2/15 $19,740 $20,720 2/16 $18,402 $19,673 2/17 $21,252 $24,031 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Class C shares held for less than one year are also subject to a 1% contingent deferred sales charge (CDSC). "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. The Fund acquired the assets and liabilities of Pioneer Disciplined Growth Fund ("the predecessor fund") on June 7, 2013. As a result of the reorganization, the predecessor fund's performance and financial history became the performance and financial history of the Fund. The performance of Class C shares of the Fund is the performance of Class C shares of the predecessor fund for periods prior to the reorganization, and has not been restated to reflect any differences in expenses. Please refer to the financial highlights for a more current expense ratio. 12 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 Performance Update | 2/28/17 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 Disciplined Growth Fund during the periods shown, compared to that of the Russell 1000 Growth Index. Average Annual Total Returns (As of February 28, 2017) -------------------------------------------------------------------------------- Russell 1000 Net Asset Growth Period Value (NAV) Index -------------------------------------------------------------------------------- 10 Years 8.56% 9.07% 5 Years 12.43 13.79 1 Year 16.73 22.15 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 31, 2016) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 0.86% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $5 Million Investment Pioneer Disciplined Russell 1000 Growth Fund Growth Index 2/07 $ 5,000,000 $ 5,000,000 2/08 $ 5,101,566 $ 5,020,068 2/09 $ 3,090,020 $ 3,010,387 2/10 $ 4,670,387 $ 4,641,712 2/11 $ 5,934,729 $ 5,799,499 2/12 $ 6,327,247 $ 6,241,429 2/13 $ 6,907,805 $ 6,840,421 2/14 $ 8,909,798 $ 8,833,957 2/15 $10,323,423 $10,268,583 2/16 $ 9,736,732 $ 9,749,774 2/17 $11,365,919 $11,909,422 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. The Fund acquired the assets and liabilities of Pioneer Disciplined Growth Fund ("the predecessor fund") on June 7, 2013. As a result of the reorganization, the predecessor fund's performance and financial history became the performance and financial history of the Fund. The performance of Class Y shares of the Fund is the performance of Class Y shares of the predecessor fund for periods prior to the reorganization, and has not been restated to reflect any differences in expenses. Performance shown for periods prior to the inception of Class Y shares of the predecessor fund on July 31, 2008, is the net asset value performance of the predecessor fund's Class A shares, which has not been restated to reflect any differences in expenses, including Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares generally are higher than those of Class Y shares, the performance of Class Y shares of the predecessor fund prior to their inception on July 31, 2008, would have been higher than the performance shown. Class Y shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. 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 Disciplined Growth Fund | Semiannual Report | 2/28/17 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 Disciplined Growth Fund Based on actual returns from September 1, 2016, through February 28, 2017. -------------------------------------------------------------------------------- Share Class A C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 Value on 9/1/16 -------------------------------------------------------------------------------- Ending Account $1,068.00 $1,063.60 $1,068.60 Value (after expenses) on 2/28/17 -------------------------------------------------------------------------------- Expenses Paid $ 5.64 $ 9.93 $ 4.36 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized net expense ratio of 1.10%, 1.94% and 0.85% for Class A, Class C and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 181/365 (to reflect the one-half year period). 14 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 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 Disciplined Growth Fund Based on a hypothetical 5% return per year before expenses, reflecting the period from September 1, 2016, through February 28, 2017. -------------------------------------------------------------------------------- Share Class A C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 Value on 9/1/16 -------------------------------------------------------------------------------- Ending Account $1,019.34 $1,015.17 $1,020.58 Value (after expenses) on 2/28/17 -------------------------------------------------------------------------------- Expenses Paid $ 5.51 $ 9.69 $ 4.26 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized net expense ratio of 1.10%, 1.94% and 0.85% for Class A, Class C and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 181/365 (to reflect the one-half year period). Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 15 Schedule of Investments | 2/28/17 (unaudited) ------------------------------------------------------------------------------------------------ Shares Value ------------------------------------------------------------------------------------------------ COMMON STOCKS -- 99.9% ENERGY -- 1.0% Oil & Gas Exploration & Production -- 1.0% 503,344 Cabot Oil & Gas Corp. $ 11,023,234 -------------- Total Energy $ 11,023,234 ------------------------------------------------------------------------------------------------ MATERIALS -- 4.9% Specialty Chemicals -- 2.9% 101,514 The Sherwin-Williams Co. $ 31,321,130 ------------------------------------------------------------------------------------------------ Paper Packaging -- 2.0% 478,368 Sealed Air Corp. $ 22,234,545 -------------- Total Materials $ 53,555,675 ------------------------------------------------------------------------------------------------ CAPITAL GOODS -- 6.0% Building Products -- 1.5% 481,214 Masco Corp. $ 16,255,409 ------------------------------------------------------------------------------------------------ Industrial Machinery -- 4.5% 379,336 Illinois Tool Works, Inc. $ 50,076,145 -------------- Total Capital Goods $ 66,331,554 ------------------------------------------------------------------------------------------------ TRANSPORTATION -- 6.0% Air Freight & Logistics -- 2.6% 274,385 United Parcel Service, Inc. (Class B) $ 29,018,958 ------------------------------------------------------------------------------------------------ Trucking -- 3.4% 379,151 JB Hunt Transport Services, Inc. $ 37,221,254 -------------- Total Transportation $ 66,240,212 ------------------------------------------------------------------------------------------------ CONSUMER SERVICES -- 3.2% Restaurants -- 3.2% 609,698 Starbucks Corp. $ 34,673,525 -------------- Total Consumer Services $ 34,673,525 ------------------------------------------------------------------------------------------------ MEDIA -- 3.1% Cable & Satellite -- 3.1% 902,484 Comcast Corp. $ 33,770,951 -------------- Total Media $ 33,770,951 ------------------------------------------------------------------------------------------------ RETAILING -- 10.2% Internet Retail -- 5.0% 65,539 Amazon.com, Inc.* $ 55,383,077 ------------------------------------------------------------------------------------------------ Home Improvement Retail -- 4.1% 311,091 The Home Depot, Inc. $ 45,080,197 ------------------------------------------------------------------------------------------------ Automotive Retail -- 1.1% 75,382 Advance Auto Parts, Inc. $ 11,805,575 -------------- Total Retailing $ 112,268,849 ------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. 16 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 ------------------------------------------------------------------------------------------------ Shares Value ------------------------------------------------------------------------------------------------ FOOD & STAPLES RETAILING -- 2.9% Drug Retail -- 2.9% 396,227 CVS Health Corp. $ 31,927,972 -------------- Total Food & Staples Retailing $ 31,927,972 ------------------------------------------------------------------------------------------------ FOOD, BEVERAGE & TOBACCO -- 5.5% Brewers -- 2.0% 220,813 Molson Coors Brewing Co. (Class B) $ 22,167,417 ------------------------------------------------------------------------------------------------ Packaged Foods & Meats -- 3.5% 114,253 McCormick & Co., Inc. $ 11,244,780 251,793 The Hershey Co. 27,281,772 -------------- $ 38,526,552 -------------- Total Food, Beverage & Tobacco $ 60,693,969 ------------------------------------------------------------------------------------------------ HEALTH CARE EQUIPMENT & SERVICES -- 6.2% Health Care Supplies -- 3.2% 173,512 The Cooper Companies, Inc. $ 34,553,180 ------------------------------------------------------------------------------------------------ Managed Health Care -- 3.0% 158,358 Humana, Inc. $ 33,453,128 -------------- Total Health Care Equipment & Services $ 68,006,308 ------------------------------------------------------------------------------------------------ PHARMACEUTICALS, BIOTECHNOLOGY & LIFE SCIENCES -- 5.3% Biotechnology -- 5.3% 174,060 Alder Biopharmaceuticals, Inc. $ 3,977,271 206,727 Celgene Corp.* 25,532,852 314,098 Vertex Pharmaceuticals, Inc.* 28,463,561 -------------- $ 57,973,684 -------------- Total Pharmaceuticals, Biotechnology & Life Sciences $ 57,973,684 ------------------------------------------------------------------------------------------------ DIVERSIFIED FINANCIALS -- 7.0% Specialized Finance -- 3.9% 751,479 Intercontinental Exchange, Inc. $ 42,931,995 ------------------------------------------------------------------------------------------------ Investment Banking & Brokerage -- 3.1% 840,391 The Charles Schwab Corp. $ 33,960,200 -------------- Total Diversified Financials $ 76,892,195 ------------------------------------------------------------------------------------------------ SOFTWARE & SERVICES -- 22.3% Internet Software & Services -- 10.9% 52,334 Alphabet, Inc. (Class A) $ 44,218,567 46,793 Alphabet, Inc. (Class C) 38,520,466 1,082,374 eBay, Inc.* 36,692,479 -------------- $ 119,431,512 ------------------------------------------------------------------------------------------------ IT Consulting & Other Services -- 1.3% 246,542 Cognizant Technology Solutions Corp.* $ 14,612,544 ------------------------------------------------------------------------------------------------ The accompanying notes are an integral part of these financial statements. Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 17 Schedule of Investments | 2/28/17 (unaudited) (continued) ------------------------------------------------------------------------------------------------ Shares Value ------------------------------------------------------------------------------------------------ Data Processing & Outsourced Services -- 4.7% 587,914 Visa, Inc. $ 51,701,157 ------------------------------------------------------------------------------------------------ Systems Software -- 5.4% 924,470 Microsoft Corp. $ 59,147,591 -------------- Total Software & Services $ 244,892,804 ------------------------------------------------------------------------------------------------ TECHNOLOGY HARDWARE & EQUIPMENT -- 10.6% Computer Storage & Peripherals -- 7.6% 610,582 Apple, Inc. $ 83,643,625 ------------------------------------------------------------------------------------------------ Technology Distributors -- 3.0% 561,885 CDW Corp./DE $ 33,095,026 -------------- Total Technology Hardware & Equipment $ 116,738,651 ------------------------------------------------------------------------------------------------ SEMICONDUCTORS & SEMICONDUCTOR EQUIPMENT -- 3.9% Semiconductors -- 3.9% 1,363,684 Taiwan Semiconductor Manufacturing Co., Ltd. (A.D.R.) $ 42,915,135 -------------- Total Semiconductors & Semiconductor Equipment $ 42,915,135 ------------------------------------------------------------------------------------------------ TELECOMMUNICATION SERVICES -- 1.8% Integrated Telecommunication Services -- 1.8% 395,639 Verizon Communications, Inc. $ 19,635,564 -------------- Total Telecommunication Services $ 19,635,564 ------------------------------------------------------------------------------------------------ TOTAL COMMON STOCKS (Cost $856,482,747) $1,097,540,282 ------------------------------------------------------------------------------------------------ TOTAL INVESTMENT IN SECURITIES -- 99.9% (Cost $856,482,747) (a) $1,097,540,282 ------------------------------------------------------------------------------------------------ OTHER ASSETS & LIABILITIES -- 0.1% $ 1,596,830 ------------------------------------------------------------------------------------------------ TOTAL NET ASSETS -- 100.0% $1,099,137,112 ================================================================================================ * Non-income producing security. (A.D.R.) American Depositary Receipts. (a) At February 28, 2017, the net unrealized appreciation on investments based on cost for federal income tax purposes of $857,591,130 was as follows: Aggregate gross unrealized appreciation for all investments in which there is an excess of value over tax cost $243,961,365 Aggregate gross unrealized depreciation for all investments in which there is an excess of tax cost over value (4,012,213) ------------ Net unrealized appreciation $239,949,152 ============ Purchases and sales of securities (excluding temporary cash investments) for the six months ended February 28, 2017, aggregated $422,055,684 and $439,659,733, respectively. The Fund is permitted to engage in purchase and sale transactions ("cross trades") with certain Funds and accounts for which 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. The accompanying notes are an integral part of these financial statements. 18 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 During the six months ended February 28, 2017, the Fund engaged in purchases and sales pursuant to these procedures amounting to $-- and $18,955,996, respectively, which resulted in a net realized gain/loss of $293,559. 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 following is a summary of the inputs used as of February 28, 2017, in valuing the Fund's investments: -------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total -------------------------------------------------------------------------------- Common Stocks $1,097,540,282 $-- $-- $1,097,540,282 -------------------------------------------------------------------------------- Total $1,097,540,282 $-- $-- $1,097,540,282 ================================================================================ During the six months ended February 28, 2017, there were no transfers between Levels 1, 2 and 3. The accompanying notes are an integral part of these financial statements. Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 19 Statement of Assets and Liabilities | 2/28/17 (unaudited) ASSETS: Investment in securities (cost $856,482,747) $1,097,540,282 Cash 3,326,857 Receivables -- Fund shares sold 82,497 Dividends 1,212,264 Other assets 59,871 -------------------------------------------------------------------------------- Total assets $1,102,221,771 ================================================================================ LIABILITIES: Payables -- Investment securities purchased $ 2,097,254 Fund shares repurchased 591,816 Federal registration expense payable 54,942 Due to affiliates 111,733 Trustee fees 8,062 Accrued expenses 220,852 -------------------------------------------------------------------------------- Total liabilities $ 3,084,659 ================================================================================ NET ASSETS: Paid-in capital $ 837,221,412 Undistributed net investment income 527,396 Accumulated net realized gain on investments 20,330,769 Net unrealized appreciation on investments 241,057,535 -------------------------------------------------------------------------------- Total net assets $1,099,137,112 ================================================================================ NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Class A (based on $1,033,601,904/59,967,041 shares) $ 17.24 Class C (based on $20,510,859/1,309,214 shares) $ 15.67 Class Y (based on $45,024,349/2,563,477 shares) $ 17.56 MAXIMUM OFFERING PRICE: Class A ($17.24 (divided by) 94.25%) $ 18.29 ================================================================================ The accompanying notes are an integral part of these financial statements. 20 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 Statement of Operations (unaudited) For the Six Months Ended 2/28/17 INVESTMENT INCOME: Dividends $ 6,939,702 Interest 6,145 ------------------------------------------------------------------------------------------------ Total investment income $ 6,945,847 ------------------------------------------------------------------------------------------------ EXPENSES: Management fees $ 3,386,330 Transfer agent fees Class A 411,593 Class C 19,526 Class Y 25,518 Distribution fees Class A 1,229,214 Class C 100,013 Shareholder communications expense 212,346 Administrative expense 278,796 Custodian fees 6,751 Registration fees 27,476 Professional fees 25,987 Printing expense 7,631 Fees and expenses of nonaffiliated Trustees 22,800 Miscellaneous 45,191 ------------------------------------------------------------------------------------------------ Total expenses $ 5,799,172 ----------------------------------------------------------------------------------------------- Net investment income $ 1,146,675 ------------------------------------------------------------------------------------------------ REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS: Net realized gain (loss) on investments $25,864,432 ------------------------------------------------------------------------------------------------ Change in net unrealized appreciation (depreciation) on investments $43,190,942 ------------------------------------------------------------------------------------------------ Net realized and unrealized gain (loss) on investments $69,055,374 ------------------------------------------------------------------------------------------------ Net increase in net assets resulting from operations $70,202,049 ================================================================================================ The accompanying notes are an integral part of these financial statements. Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 21 Statements of Changes in Net Assets ----------------------------------------------------------------------------------------------- Six Months Ended 2/28/17 Year Ended (unaudited) 8/31/16 ----------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income (loss) $ 1,146,675 $ 3,836,673 Net realized gain (loss) on investments 25,864,432 76,770,271 Change in net unrealized appreciation (depreciation) on investments 43,190,942 (8,070,036) ----------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 70,202,049 $ 72,536,908 =============================================================================================== DISTRIBUTIONS TO SHAREOWNERS: Net investment income: Class A ($0.04 and $0.05 per share, respectively) $ (2,602,801) $ (3,002,270) Class Y ($0.09 and $0.11 per share, respectively) (222,001) (218,041) Net realized gain: Class A ($1.35 and $1.00 per share, respectively) (75,838,049) (55,189,396) Class C ($1.35 and $1.00 per share, respectively) (1,681,538) (1,403,033) Class Y ($1.35 and $1.00 per share, respectively) (3,248,377) (1,967,556) ----------------------------------------------------------------------------------------------- Total distributions to shareowners $ (83,592,766) $ (61,780,296) =============================================================================================== FROM FUND SHARE TRANSACTIONS: Net proceeds from sale of shares $ 29,002,375 $ 68,722,405 Reinvestment of distributions 82,614,373 60,988,525 Cost of shares repurchased (56,321,520) (113,614,415) ----------------------------------------------------------------------------------------------- Net increase in net assets resulting from Fund share transactions $ 55,295,228 $ 16,096,515 ----------------------------------------------------------------------------------------------- Net increase in net assets $ 41,904,511 $ 26,853,127 NET ASSETS: Beginning of period $ 1,057,232,601 $ 1,030,379,474 ----------------------------------------------------------------------------------------------- End of period $ 1,099,137,112 $ 1,057,232,601 ----------------------------------------------------------------------------------------------- Undistributed net investment income $ 527,396 $ 2,205,523 =============================================================================================== The accompanying notes are an integral part of these financial statements. 22 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 ----------------------------------------------------------------------------------------------- Six Months Six Months Ended Ended 2/28/17 2/28/17 Year Ended Year Ended Shares Amount 8/31/16 8/31/16 (unaudited) (unaudited) Shares Amount ----------------------------------------------------------------------------------------------- Class A Shares sold 1,338,655 $ 22,615,741 2,881,007 $ 49,095,074 Reinvestment of distributions 4,766,798 77,690,076 3,298,673 57,586,443 Less shares repurchased (2,828,739) (48,015,545) (5,628,365) (96,294,767) ----------------------------------------------------------------------------------------------- Net increase 3,276,714 $ 52,290,272 551,315 $ 10,386,750 =============================================================================================== Class C Shares sold 73,796 $ 1,133,872 200,413 $ 3,160,251 Reinvestment of distributions 106,687 1,578,966 81,888 1,317,581 Less shares repurchased (163,214) (2,521,917) (422,802) (6,511,902) ----------------------------------------------------------------------------------------------- Net increase (decrease) 17,269 $ 190,921 (140,501) $ (2,034,070) =============================================================================================== Class Y Shares sold 305,030 $ 5,252,762 978,917 $ 16,467,080 Reinvestment of distributions 200,995 3,345,331 117,169 2,084,501 Less shares repurchased (335,124) (5,784,058) (621,631) (10,807,746) ----------------------------------------------------------------------------------------------- Net increase 170,901 $ 2,814,035 474,455 $ 7,743,835 =============================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 23 Financial Highlights ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 2/28/17 Ended Ended Ended Ended Ended (unaudited) 8/31/16 8/31/15 8/31/14 8/31/13 (a) 8/31/12 (a) ---------------------------------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of period $ 17.53 $ 17.34 $ 17.93 $ 14.27 $ 13.93 $ 12.96 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) $ 0.02(b) $ 0.06(b) $ 0.05 $ 0.17 $ 0.06 $ 0.03 Net realized and unrealized gain (loss) on investments 1.08 1.18 0.43 3.52 2.13 2.03 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 1.10 $ 1.24 $ 0.48 $ 3.69 $ 2.19 $ 2.06 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.04) $ (0.05) $ (0.16) $ (0.03) $ (0.08) $ (0.04) Net realized gain (1.35) (1.00) (0.91) -- (1.77) (1.05) ------------------------------------------------------------------------------------------------------------------------------------ Total distributions $ (1.39) $ (1.05) $ (1.07) $ (0.03) $ (1.85) $ (1.09) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (0.29) $ 0.19 $ (0.59) $ 3.66 $ 0.34 $ 0.97 ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 17.24 $ 17.53 $ 17.34 $ 17.93 $ 14.27 $ 13.93 ==================================================================================================================================== Total return* 6.80% 7.18% 2.58% 25.89% 16.57% 17.46% Ratio of net expenses to average net assets 1.10%** 1.13% 1.14% 1.18% 1.23% 1.25% Ratio of net investment income (loss) to average net assets 0.23%** 0.38% 0.33% 1.01% 0.26% 0.31% Portfolio turnover rate 81%** 118% 49% 47% 45% 75% Net assets, end of period (in thousands) $ 1,033,602 $ 993,736 $ 973,492 $998,718 $ 846,042 $ 9,646 Ratios with no waiver of fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Total expenses to average net assets 1.10%** 1.13% 1.14% 1.18% 1.26% 1.48% Net investment income (loss) to average net assets 0.23%** 0.38% 0.33% 1.01% 0.23% 0.08% ==================================================================================================================================== (a) The Fund acquired the assets and liabilities of Pioneer Disciplined Growth Fund (the "predecessor fund") on June 7, 2013 (the "reorganization"). As a result of the reorganization, the predecessor fund's performance and financial history became the performance and financial history of the Fund. Historical per-share amounts prior to June 7, 2013 have been adjusted to reflect the conversion ratio used to align the net asset values of the predecessor fund with those of the Fund. (b) The per-share data presented above is based on the average shares outstanding for the period presented. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized. The accompanying notes are an integral part of these financial statements. 24 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 2/28/17 Ended Ended Ended Ended Ended (unaudited) 8/31/16 8/31/15 8/31/14 8/31/13 (a) 8/31/12 (a) ------------------------------------------------------------------------------------------------------------------------------------ Class C Net asset value, beginning of period $ 16.08 $ 16.07 $ 16.72 $ 13.40 $ 13.17 $ 12.35 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) $ (0.05)(b)(c) $ (0.08)(b)(c) $ (0.09)(c) $ 0.03 $ (0.05) $ (0.08) Net realized and unrealized gain (loss) on investments 0.99 1.09 0.40 3.29 2.00 1.92 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.94 $ 1.01 $ 0.31 $ 3.32 $ 1.95 $ 1.84 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ -- $ -- $ (0.05) $ -- $ (1.72) $ (1.02) Net realized gain (1.35) (1.00) (0.91) -- -- -- ------------------------------------------------------------------------------------------------------------------------------------ Total distributions $ (1.35) $ (1.00) $ (0.96) $ -- $ (1.72) $ (1.02) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (0.41) $ 0.01 $ (0.65) $ 3.32 $ 0.23 $ 0.82 ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 15.67 $ 16.08 $ 16.07 $ 16.72 $ 13.40 $ 13.17 ==================================================================================================================================== Total return* 6.36% 6.26% 1.74% 24.78% 15.49% 16.41% Ratio of net expenses to average net assets 1.94%** 1.98% 2.00% 2.04% 2.15% 2.15% Ratio of net investment income (loss) to average net assets (0.62)%** (0.48)% (0.51)% 0.15% (0.59)% (0.58)% Portfolio turnover rate 81%** 118% 49% 47% 45% 75% Net assets, end of period (in thousands) $20,511 $20,776 $23,020 $ 20,453 $ 17,505 $ 1,501 Ratios with no waiver of fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Total expenses to average net assets 1.94%** 1.98% 2.00% 2.04% 2.25% 2.41% Net investment income (loss) to average net assets (0.62)%** (0.48)% (0.51)% 0.15% (0.69)% (0.84)% ==================================================================================================================================== (a) The Fund acquired the assets and liabilities of Pioneer Disciplined Growth Fund (the "predecessor fund") on June 7, 2013 (the "reorganization"). As a result of the reorganization, the predecessor fund's performance and financial history became the performance and financial history of the Fund. Historical per-share amounts prior to June 7, 2013 have been adjusted to reflect the conversion ratio used to align the net asset values of the predecessor fund with those of the Fund. (b) The per-share data presented above is based on the average shares outstanding for the period presented. (c) The amount shown for a share outstanding does not correspond with net investment income on the Statement of Operations for the period due to timing of the sales and repurchase of shares. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized The accompanying notes are an integral part of these financial statements. Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 25 Financial Highlights (continued) ------------------------------------------------------------------------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 2/28/17 Ended Ended Ended Ended Ended (unaudited) 8/31/16 8/31/15 8/31/14 8/31/13 (a) 8/31/12 (a) ------------------------------------------------------------------------------------------------------------------------------------ Class Y Net asset value, beginning of period $ 17.86 $ 17.66 $ 18.24 $ 14.49 $ 14.16 $ 13.16 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) $ 0.04(b) $ 0.11(b) $ 0.10 $ 0.33 $ 0.13 $ 0.09 Net realized and unrealized gain (loss) on investments 1.10 1.20 0.45 3.49 2.14 2.04 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 1.14 $ 1.31 $ 0.55 $ 3.82 $ 2.27 $ 2.13 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.09) $ (0.11) $ (0.22) $ (0.07) $ (0.16) $ (0.08) Net realized gain (1.35) (1.00) (0.91) -- (1.78) (1.05) ------------------------------------------------------------------------------------------------------------------------------------ Total distributions $ (1.44) $ (1.11) $ (1.13) $ (0.07) $ (1.94) $ (1.13) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (0.30) $ 0.20 $ (0.58) $ 3.75 $ 0.33 $ 1.00 ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 17.56 $ 17.86 $ 17.66 $ 18.24 $ 14.49 $ 14.16 ==================================================================================================================================== Total return* 6.86% 7.46%(c) 2.93% 26.41% 16.95% 17.88% Ratio of net expenses to average net assets 0.85%** 0.86% 0.82% 0.75% 0.90% 0.90% Ratio of net investment income (loss) to average net assets 0.48%** 0.65% 0.70% 1.52% 0.78% 0.67% Portfolio turnover rate 81%** 118% 49% 47% 45% 75% Net assets, end of period (in thousands) $ 45,024 $ 42,721 $ 33,867 $ 19,818 $ 28,352 $ 38,296 Ratios with no waiver of fees and assumption of expenses by PIM and no reduction for fees paid indirectly: Total expenses to average net assets 0.85%** 0.86% 0.82% 0.75% 0.95% 1.00% Net investment income (loss) to average net assets 0.48%** 0.65% 0.70% 1.52% 0.73% 0.57% ==================================================================================================================================== (a) The Fund acquired the assets and liabilities of Pioneer Disciplined Growth Fund (the "predecessor fund") on June 7, 2013 (the "reorganization"). As a result of the reorganization, the predecessor fund's performance and financial history became the performance and financial history of the Fund. Historical per-share amounts prior to June 7, 2013 have been adjusted to reflect the conversion ratio used to align the net asset values of the predecessor fund with those of the Fund. (b) The per-share data presented above is based on the average shares outstanding for the period presented. (c) If the Fund had not recognized gains in settlement of class action lawsuits during the year ended August 31, 2016, the total return would have been 7.40%. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if sales charges were taken into account. ** Annualized The accompanying notes are an integral part of these financial statements. 26 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 Notes to Financial Statements | 2/28/17 (unaudited) 1. Organization and Significant Accounting Policies Pioneer Disciplined Growth Fund (the Fund) is a diversified series of Pioneer Series Trust XII, a Delaware statutory trust. The Fund is registered under the Investment Company Act of 1940 as a diversified, open-end management investment company. The Fund's investment objective is to seek long-term capital growth. The Fund offers 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. 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 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. Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 27 Equity securities that have traded on an exchange are valued by using the last sale price on the principal exchange where they are traded. Equity securities that have not traded on the date of valuation, or securities for which sale prices are not available, generally are valued using the mean between the last bid and asked prices or, if both last bid and asked prices are not available, at the last quoted bid price. Last sale and bid and asked prices are provided by independent third party pricing services. In the case of equity securities not traded on an exchange, prices are typically determined by independent third party pricing services using a variety of techniques and methods. The value of foreign securities is translated into U.S. dollars based on foreign currency exchange rate quotations supplied by a third party pricing source. Trading in non-U.S. equity securities is substantially completed each day at various times prior to the close of the NYSE. The values of such securities used in computing the net asset value of the Fund's shares are determined as of such times. The Fund may use a fair value model developed by an independent pricing service to value non-U.S. equity securities. 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 Pioneer Investment Management, Inc. (PIM), the Fund's investment adviser and a wholly owned indirect subsidiary of UniCredit S.p.A. (UniCredit), pursuant to procedures adopted by the Fund's Board of Trustees. PIM's fair valuation team uses fair value methods approved by the Valuation Committee of the Board of Trustees. 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 February 28, 2017, there were no securities that were valued using fair value methods (other than securities valued using prices supplied by independent pricing services). 28 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 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 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. Federal Income Taxes It is the Fund's policy to comply with the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute all of its taxable income and net realized capital gains, if any, to its shareowners. Therefore, no provision for federal income taxes is required. As of August 31, 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 fiscal years remain subject to examination by Federal and State tax authorities. The amount and character of income and capital gain distributions to shareowners are determined in accordance with federal income tax rules, which may differ from U.S. GAAP. Distributions in excess of net investment income or net realized gains are temporary 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 during the year ended August 31, 2016 was as follows: ---------------------------------------------------------------------------- 2016 ---------------------------------------------------------------------------- Distributions paid from: Ordinary income $ 3,220,311 Long-term capital gain 58,559,985 ---------------------------------------------------------------------------- Total $61,780,296 ============================================================================ Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 29 The following shows the components of distributable earnings on a federal income tax-basis at August 31, 2016: ---------------------------------------------------------------------------- 2016 ---------------------------------------------------------------------------- Distributable earnings: Undistributed ordinary income $ 2,145,653 Undistributed long term capital gain 76,402,554 Net unrealized appreciation 196,758,210 ---------------------------------------------------------------------------- Total $275,306,417 ============================================================================ The difference between book-basis and tax-basis net unrealized appreciation is attributable to the tax deferral of losses on wash sales, and adjustments related to other holdings. D. Fund Shares The Fund records sales and repurchases of its shares as of trade date. Pioneer Funds Distributor, Inc. (PFD), the principal underwriter for the Fund and a wholly owned indirect subsidiary of UniCredit, earned $20,142 in underwriting commissions on the sale of Class A shares during the year ended February 28, 2017. E. 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 (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. 30 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 F. Risks At times, the Fund's investments may represent industries or industry sectors that are interrelated or have common risks, making the Fund more susceptible to any economic, political, or regulatory developments or other risks affecting those industries and sectors. The Fund's prospectus contains unaudited information regarding the Fund's principal risks. Please refer to that document when considering the Fund's principal risks. 2. Management Agreement PIM manages the Fund's portfolio. Management fees are calculated daily at the annual rate equal to 0.65% of the Fund's average daily net assets up to $1 billion, 0.60% of the next $4 billion of the Fund's average daily net assets and 0.55% of the Fund's average daily net assets over $5 billion. For the six months ended February 28, 2017, the effective annualized management fee (excluding waivers and/or assumption of expenses) was equivalent to 0.65% of the Fund's average daily net assets. In addition, under the management and administration agreements, certain other services and costs, including accounting, regulatory reporting and insurance premiums, are paid by the Fund as administrative reimbursements. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $81,014 in management fees, administrative costs and certain other reimbursements payable to PIM at February 28, 2017. 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 February 28, 2017, such out-of-pocket expenses by class of shares were as follows: -------------------------------------------------------------------------------- Shareholder Communications: -------------------------------------------------------------------------------- Class A $209,103 Class C 2,289 Class Y 954 -------------------------------------------------------------------------------- Total $212,346 ================================================================================ Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 31 4. Distribution Plan The Fund has adopted a Distribution Plan pursuant to Rule 12b-1 of the Investment Company Act of 1940 with respect to its Class A and Class C shares. Pursuant to the Plan, the Fund pays PFD 0.25% of the average daily net assets attributable to Class A shares as compensation for personal services and/or account maintenance services or distribution services with regard to Class A shares. Pursuant to the Plan, the Fund also pays PFD 1.00% of the average daily net assets attributable to Class C shares. The fee for Class C shares consists of a 0.25% service fee and a 0.75% distribution fee paid as compensation for personal services and/or account maintenance services or distribution services with regard to Class C shares. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $30,719 in distribution fees payable to PFD at February 28, 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 are paid to PFD. For the six months ended February 28, 2017, CDSCs in the amount of $1,155 were paid to 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 32 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 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 participated in a facility that is in the amount of $195 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 February 28, 2017, the Fund had no borrowings under the credit facility. Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 33 ADDITIONAL INFORMATION Pioneer Investment Management, Inc. (the "Adviser"), the Fund's investment adviser, is currently an indirect, wholly owned subsidiary of UniCredit S.p.A. ("UniCredit"). On December 12, 2016, UniCredit announced that it has entered into a binding agreement for the sale of its Pioneer Investments business, which includes the Adviser, to Amundi (the "Transaction"). Amundi is headquartered in Paris, France, and, as of September 30, 2016, had more than $1.1 trillion in assets under management worldwide. The closing of the Transaction is expected to happen in 2017, subject to certain regulatory and antitrust approvals, and other conditions. Under the Investment Company Act of 1940, the closing of the Transaction will cause the Fund's current investment advisory agreement with the Adviser to terminate. Accordingly, the Fund's Board of Trustees has approved a new investment advisory agreement for the Fund, which will be submitted to the shareholders of the Fund for their approval. 34 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 Approval of Investment Advisory Agreement Pioneer Investment Management, Inc. (PIM) serves as the investment adviser to Pioneer Disciplined Growth Fund (the Fund) pursuant to an investment advisory agreement between PIM and the Fund. In order for PIM to remain the investment adviser of the Fund, the Trustees of the Fund must determine annually whether to renew the investment advisory agreement for the Fund. The contract review process began in January 2016 as the Trustees of the Fund agreed on, among other things, an overall approach and timeline for the process. Contract review materials were provided to the Trustees in March 2016 and May 2016. In addition, the Trustees reviewed and discussed the Fund's performance at regularly scheduled meetings throughout the year, and took into account other information related to the Fund provided to the Trustees at regularly scheduled meetings, in connection with the review of the Fund's investment advisory agreement. In March 2016, the Trustees, among other things, discussed the memorandum provided by Fund counsel that summarized the legal standards and other considerations that are relevant to the Trustees in their deliberations regarding the renewal of the investment advisory agreement, and reviewed and discussed the qualifications of the investment management teams, as well as the level of investment by the Fund's portfolio managers in the Fund. In May 2016, the Trustees, among other things, reviewed the Fund's management fee and total expense ratios, the financial statements of PIM and its parent companies, the profitability analyses provided by PIM, and possible economies of scale. The Trustees also reviewed the profitability of the institutional business of PIM and PIM's affiliate, Pioneer Institutional Asset Management, Inc. (together with PIM, "Pioneer"), as compared to that of PIM's fund management business, and considered the differences between the fees and expenses of the Fund and the fees and expenses of Pioneer's institutional accounts, as well as the different services provided by PIM to the Fund and by Pioneer to the institutional accounts. The Trustees further considered contract review materials in July and September 2016. At a meeting held on September 13, 2016, based on their evaluation of the information provided by PIM and third parties, the Trustees of the Fund, including the Independent Trustees voting separately, unanimously approved the renewal of the investment advisory agreement for another year. In approving the renewal of the investment advisory agreement, the Trustees considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the renewal of the agreement. Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 35 Nature, Extent and Quality of Services The Trustees considered the nature, extent and quality of the services that had been provided by PIM to the Fund, taking into account the investment objective and strategy of the Fund. The Trustees also reviewed PIM's investment approach for the Fund and its research process. The Trustees considered the resources of PIM and the personnel of PIM who provide investment management services to the Fund. They also reviewed the amount of non-Fund assets managed by the portfolio managers of the Fund. The Trustees considered the non-investment resources and personnel of PIM involved in PIM's services to the Fund, including PIM's compliance and legal resources and personnel. The Trustees noted the substantial attention and high priority given by PIM's senior management to the Pioneer fund complex. The Trustees considered that PIM supervises and monitors the performance of the Fund's service providers and provides the Fund with personnel (including Fund officers) and other resources that are necessary for the Fund's business management and operations. The Trustees also considered that, as administrator, PIM is responsible for the administration of the Fund's business and other affairs. The Trustees considered the fees paid to PIM for the provision of administration services. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that had been provided by PIM to the Fund were satisfactory and consistent with the terms of the investment advisory agreement. Performance of the Fund In considering the Fund's performance, the Trustees regularly review and discuss throughout the year data prepared by PIM 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 with the performance of the Fund's benchmark index. They also discuss the Fund's performance with PIM on a regular basis. The Trustees' regular reviews and discussions were factored into the Trustees' deliberations concerning the renewal of the advisory agreement. Management Fee and Expenses The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees and expense ratios of its peer group of funds as classified by Morningstar and also to the expense ratios of a peer group of funds selected on the basis of criteria determined by the Independent Trustees for this purpose using data provided by Strategic Insight 36 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 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. The Trustees considered that the Fund's management fee for the most recent fiscal year was in the second quintile relative to the management fees paid by other funds in its Morningstar peer group for the comparable period. The Trustees also considered the breakpoints in the management fee schedule and the reduced fee rates above certain asset levels. The Trustees considered that the expense ratio of the Fund's Class A shares for the most recent fiscal year was in the third quintile relative to its Morningstar peer group and in the second quintile relative to its Strategic Insight peer group, in each case for the comparable period. The Trustees considered the impact of transfer agency, sub-transfer agency, and other non-management fee expenses on the expense ratios of the Fund, and noted the impact of expenses relating to small accounts and omnibus accounts on transfer and sub-transfer agency expenses generally. 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 reviewed management fees charged by Pioneer to institutional and other clients, including publicly offered European funds sponsored by affiliates of Pioneer, unaffiliated U.S. registered investment companies (in a sub-advisory capacity), and unaffiliated foreign and domestic separate accounts. The Trustees also considered PIM's costs in providing services to the Fund and Pioneer's costs in providing services to the other clients and considered the differences in management fees and profit margins for Fund and non-Fund services. In evaluating the fees associated with Pioneer's client accounts, the Trustees took into account the respective demands, resources and complexity associated with the Fund and client accounts. The Trustees noted that, in some instances, the fee rates for those clients were lower than the management fee for the Fund and considered that, under the investment advisory agreement with the Fund, PIM performs additional services for the Fund that it does not provide to those other clients or services that are broader in scope, including oversight of the Fund's other service providers and activities related to compliance and the extensive regulatory and tax regimes to which the Fund is subject. The Trustees also considered the different entrepreneurial risks associated with PIM's management of the Fund and Pioneer's management of the other client accounts. The Trustees concluded that the management fee payable by the Fund to PIM was reasonable in relation to the nature and quality of the services provided by PIM to the Fund. Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 37 Profitability The Trustees considered information provided by PIM regarding the profitability of PIM with respect to the advisory services provided by PIM to the Fund, including the methodology used by PIM in allocating certain of its costs to the management of the Fund. The Trustees also considered PIM's profit margin in connection with the overall operation of the Fund. They further reviewed the financial results, including the profit margins, realized by PIM and its affiliates from non-fund businesses. The Trustees considered PIM's profit margins with respect to the Fund in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees concluded that PIM's profitability with respect to the management of the Fund was not unreasonable. Economies of Scale The Trustees considered PIM's views relating to economies of scale in connection with the Pioneer Funds as fund assets grow and the extent to which any such economies of scale are shared with funds and fund shareholders. The Trustees noted the breakpoints in the management fee schedule. The Trustees recognize that economies of scale are difficult to identify and quantify, and that, among other factors that may be relevant, are the following: fee levels, expense subsidization, investment by PIM in research and analytical capabilities and PIM'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 reductions in expenses. The Trustees concluded that economies of scale, if any, were being appropriately shared with the Funds. Other Benefits The Trustees considered the other benefits to PIM from its relationship with the Fund. The Trustees considered the character and amount of fees paid by the Fund, other than under the investment advisory agreement, for services provided by PIM and its affiliates. The Trustees further considered the revenues and profitability of PIM's businesses other than the fund business. Pioneer is the principal U.S. asset management business of Pioneer Global Asset Management, the worldwide asset management business of UniCredit Group, which manages over $150 billion in assets (including the Funds). Pioneer and the Funds receive reciprocal intangible benefits from the relationship, including mutual brand recognition and, for the Funds, direct and indirect access to the resources of a large global asset manager. The Trustees concluded that any such benefits received by Pioneer as a result of its relationship with the Funds were reasonable and their consideration of the advisory agreement between the Fund and PIM and the fees thereunder were unaffected by Pioneer's possible receipt of any such intangible benefits. 38 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 Conclusion After consideration of the factors described above as well as other factors, the Trustees, including all of the Independent Trustees, concluded that the investment advisory agreement between PIM and the Fund, including the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of the investment advisory agreement for the Fund. Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 39 Trustees, Officers and Service Providers Trustees Advisory Trustee Thomas J. Perna, Chairman Lorraine H. Monchak* David R. Bock Benjamin M. Friedman Officers Margaret B.W. Graham Lisa M. Jones, President and Chief Marguerite A. Piret Executive Officer Fred J. Ricciardi Mark E. Bradley, Treasurer and Kenneth J. Taubes Chief Financial Officer Christopher J. Kelley, Secretary and Chief Legal Officer Investment Adviser and Administrator Pioneer Investment Management, Inc. Custodian and Sub-Administrator Brown Brothers Harriman & Co. Principal Underwriter 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 us.pioneerinvestments.com. This information is also available on the Securities and Exchange Commission's web site at www.sec.gov. * Ms. Monchak is a non-voting Advisory Trustee. 40 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 This page is for your notes. Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 41 This page is for your notes. 42 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 This page is for your notes. Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 43 This page is for your notes. 44 Pioneer Disciplined Growth Fund | Semiannual Report | 2/28/17 How to Contact Pioneer We are pleased to offer a variety of convenient ways for you to contact us for assistance or information. Call us for: -------------------------------------------------------------------------------- Account Information, including existing accounts, new accounts, prospectuses, applications and service forms 1-800-225-6292 FactFone(SM) for automated fund yields, prices, account information and transactions 1-800-225-4321 Retirement plans information 1-800-622-0176 Write to us: -------------------------------------------------------------------------------- Pioneer Funds P.O. Box 55014 Boston, Massachusetts 02205-5014 Our toll-free fax 1-800-225-4240 Our internet e-mail address ask.pioneer@pioneerinvestments.com (for general questions about Pioneer only) Visit our web site: us.pioneerinvestments.com This report must be preceded or accompanied by a prospectus. The Fund files a complete schedule of investments with the Securities and Exchange Commission for the first and third quarters for each fiscal year on Form N-Q. Shareholders may view the filed Form N-Q by visiting the Commission's web site at http://www.sec.gov. The filed form may also be viewed and copied at the Commission's Public Reference Room in Washington, DC. Information regarding the operations of the Public Reference Room may be obtained by calling 1-800-SEC-0330. [LOGO] PIONEER Investments(R) Pioneer Investment Management, Inc. 60 State Street Boston, MA 02109 us.pioneerinvestments.com Securities offered through Pioneer Funds Distributor, Inc. 60 State Street, Boston, MA 02109 Underwriter of Pioneer Mutual Funds, Member SIPC (C) 2017 Pioneer Investments 19111-11-0417 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 XII By (Signature and Title)* /s/ Lisa M. Jones Lisa M. Jones, President & Chief Executive Officer Date May 1, 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 May 1, 2017 By (Signature and Title)* /s/ Mark E. Bradley Mark E. Bradley, Treasurer & Chief Accounting & Financial Officer Date May 1, 2017 * Print the name and title of each signing officer under his or her signature.