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 811-21460 Pioneer Series Trust II (Exact name of registrant as specified in charter) 60 State Street, Boston, MA 02109 (Address of principal executive offices) (ZIP code) Terrence J. Cullen, Amundi Pioneer Asset Management, Inc., 60 State Street, Boston, MA 02109 (Name and address of agent for service) Registrant's telephone number, including area code: (617) 742-7825 Date of fiscal year end: November 30, 2019 Date of reporting period: December 1, 2018 through November 30, 2019 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 Select Mid Cap Growth Fund -------------------------------------------------------------------------------- Annual Report | November 30, 2019 -------------------------------------------------------------------------------- Ticker Symbols: Class A PGOFX Class C GOFCX Class K PSMKX Class R PGRRX Class Y GROYX Beginning in February 2021, as permitted by regulations adopted by the Securities and Exchange Commission, paper copies of the Fund's shareholder reports like this one will no longer be sent by mail, unless you specifically request paper copies of the reports from the Fund or from your financial intermediary, such as a broker-dealer, bank or insurance company. Instead, the reports will be made available on the Fund's website, and you will be notified by mail each time a report is posted and provided with a website link to access the report. If you already elected to receive shareholder reports electronically, you will not be affected by this change and you need not take any action. You may elect to receive shareholder reports and other communications electronically by contacting your financial intermediary or, if you invest directly with the Fund, by calling 1-800-225-6292. You may elect to receive all future reports in paper free of charge. If you invest directly with the Fund, you can inform the Fund that you wish to continue receiving paper copies of your shareholder reports by calling 1-800-225-6292. If you invest through a financial intermediary, you can contact your financial intermediary to request that you continue to receive paper copies of your shareholder reports. Your election to receive reports in paper will apply to all funds held in your account if you invest through your financial intermediary or all funds held within the Pioneer Fund complex if you invest directly. [LOGO] Amundi Pioneer ============== ASSET MANAGEMENT visit us: www.amundipioneer.com/us Table of Contents President's Letter 2 Portfolio Management Discussion 4 Portfolio Summary 10 Prices and Distributions 11 Performance Update 12 Comparing Ongoing Fund Expenses 17 Schedule of Investments 19 Financial Statements 26 Notes to Financial Statements 35 Report of Independent Registered Public Accounting Firm 44 Approval of Investment Management Agreement 46 Trustees, Officers and Service Providers 51 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 1 President's Letter Dear Shareholders, As we enter 2020 and welcome a new decade, history has taught us the importance of taking a long-term horizon when investing, which has typically proven to be a prudent approach to generating solid returns over time. Since 1928, our investment process has been built on a foundation of fundamental research and active management, principles which have guided our investment decisions for more than 90 years. We believe active management --that is, making active investment decisions -- can help mitigate the potential risks during periods of market volatility. In today's global economy, investment risk can materialize from a number of factors, including a slowing economy, changing U.S. Federal Reserve interest-rate policy, oil price shocks, and political and geopolitical factors. At Amundi Pioneer, active management begins with our own fundamental, bottom-up research process. Our team of dedicated research analysts and portfolio managers analyze each security under consideration, communicating directly with the management teams of the companies issuing the securities and working together to identify those securities that best meet our investment criteria for our family of funds. Our risk management approach begins with each and every security, as we strive to carefully understand the potential opportunity, while considering any and all risk factors. Today, as investors, we have many options. It is our view that active management can serve shareholders well, not only when markets are thriving, but also during periods of market stress. As you consider your long-term investment goals, we encourage you to work with your financial advisor to develop an investment plan that paves the way for you to pursue both your short and long term goals. 2 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 We greatly appreciate the trust you have placed in us and look forward to continuing to serve you in the future. Sincerely, /s/ Lisa M. Jones Lisa M. Jones Head of the Americas, President and CEO of U.S. Amundi Pioneer Asset Management USA, Inc. November 30, 2019 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 Select Mid Cap Growth Fund | Annual Report | 11/30/19 3 Portfolio Management Discussion | 11/30/19 In the following interview, Ken Winston discusses the market environment and the factors that affected the performance of Pioneer Select Mid Cap Growth Fund during the 12-month period ended November 30, 2019. Mr. Winston, a senior vice president at Amundi Pioneer Asset Management, Inc. (Amundi Pioneer) and lead portfolio manager of the Fund, is responsible for the day-to-day management of the Fund's portfolio, along with Shaji John, a vice president and a portfolio manager at Amundi Pioneer, and David Sobell, a vice president and portfolio manager at Amundi Pioneer. Q How did the Fund perform during the 12-month period ended November 30, 2019? A Pioneer Select Mid Cap Growth Fund's Class A shares returned 18.54% at net asset value (NAV) during the 12-month period ended November 30, 2019, while the Fund's benchmark, the Russell Midcap Growth Index (the Russell Index), returned 21.75%. During the same 12-month period, the average return of the 617 mutual funds in Morningstar's Mid-Cap Growth Funds category was 17.56%. Q How would you describe the investment environment in the equity market during the 12-month period ended November 30, 2019? A The 12-month period began with a sharp correction in domestic stocks in December 2018, when the U.S. Federal Reserve (Fed) increased the federal funds rate for the fourth time in calendar year 2018. At the same time, trade disputes between the U.S. and China began escalating and caused further trepidation among equity investors. However, after the sharp correction in December 2018, domestic stocks rose steadily throughout the 12-month period, with only three brief setbacks in May, August, and October of 2019. Each period of market weakness -- usually in response to news signaling a lack of progress in U.S./China trade discussions and/or reports of weaker global manufacturing activity -- was soon followed by a full recovery. For the full 12-month period, U.S. stocks, as measured by the Standard & Poor's 500 Index (the S&P 500), returned 16.11%, while the Fund's benchmark, the Russell Index, returned 21.75%. U.S. economic growth slowed along with decelerating global economies during the 12-month period, while trade tensions between the U.S. and China ebbed and flowed, but remained a constant cause of investor concern and had a dampening effect on business confidence. The Fed responded to the weakening economic picture by cutting interest rates 4 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 three times between July and October of 2019. Meanwhile, towards the end of the 12-month period, the U.S. and China agreed in principle on a "phase-one" trade deal. "Easy" money conditions also played a major role in propelling equity markets higher during the 12-month period. Not only did the Fed cut rates three times, but it also ended its balance-sheet reduction program earlier than planned. It then began to swell its balance sheet once again, thus pumping more liquidity into the economy to ease stress in the overnight lending market. Another positive factor during the 12-month period was a resilient U.S. labor market and the continued strength in domestic consumer spending. Those positives contrasted with generally weak manufacturing data in both the U.S. and globally throughout most of the 12-month period. The 21.75% return of U.S. mid-cap growth stocks (as measured by the Russell Index) significantly outperformed all other U.S. equity categories during the 12-month period, and greatly outpaced other mid-cap categories. To illustrate, the mid-cap core category, as measured by the S&P Midcap 400 Index, returned just 8.83% over the 12-month period, while mid-cap value stocks, as measured by the Russell Midcap Value Index, returned 10.34%. Within the Russell Index, the three best-performing sectors during the 12-month period were information technology, real estate, and financials, which returned 31.6%, 29.8%, and 23.0%, respectively. Meanwhile, energy (-15.4%) was by far the worst-performing sector in the Russell Index over the 12-month period, while communications services (up by 5%) and consumer staples (up by 14%) also lagged despite posting positive returns. Q Which of your investment decisions had the greatest effects on the Fund's benchmark-relative performance during the 12-month period ended November 30, 2019? A Despite a strong absolute return, the Fund underperformed the Russell Index during the 12-month period, with both sector allocation and security selection detracting from relative performance. Benchmark-relative underperformance within sector allocation primarily resulted from the Fund's underweights to each of the top-performing sectors (information technology, real estate, and financials), combined with overweights to the underperforming communications services and health care sectors. Benefits of a portfolio underweight to the underperforming consumer staples sector partially offset the aforementioned negatives. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 5 Stock selection results also detracted from the Fund's benchmark-relative returns during the 12-month period, with selection results the worst in the consumer discretionary sector, and best in the information technology sector. With regard to individual stocks, the biggest detractors from the Fund's benchmark-relative performance during the 12-month period were portfolio positions in Chart Industries (industrials), PVH (consumer discretionary), and Align Technology (health care holding), while not owning shares of Lam Research (information technology) also had a negative effect on benchmark-relative returns. Chart Industries manufactures cryogenic equipment used in the production, storage, and distribution of liquefied natural gas (LNG) and industrial gases. End-user purchases of new equipment can be very cyclical and affected by LNG project delays, not to mention fluctuations in both demand and supply for natural gas, which is a factor beyond an individual company's control. Slowing global manufacturing activity as well as U.S./China trade concerns resulted in dampened business confidence and weaker-than-expected purchases of Chart's products during the 12-month period, which caused a decline in the company's share price. We trimmed the Fund's position in Chart during the period, but retained a holding in the portfolio as of period-end. PVH is a global apparel company with power brands Calvin Klein and Tommy Hilfiger. The company's share price declined in the middle of 2019 after PVH reported its April quarter-end results and provided dismal sales guidance for the July quarter. PVH has both a retail and a wholesale business, and its domestic retail business has been struggling due to an outlet concentration that relies heavily on spending by foreign tourists, which has weakened significantly of late because of the strength of the U.S. dollar. We exited the Fund's PVH position during the third quarter of 2019. Not owning shares of Lam Research, which makes semiconductor processing equipment used to produce integrated circuits, also detracted from the Fund's benchmark-relative performance during the 12-month period. Lam's shares significantly outperformed over the past year, despite the company's quarterly reports that showed year-over-year declines in both sales and profits. Investors bid up Lam's shares anyway, however, while anticipating a bottoming of the semiconductor equipment cycle in early 2020. Since Lam is a large constituent of the Russell Index, the Fund's lack of exposure to the outperforming stock hurt relative returns. Align Technology makes clear-aligner systems for the straightening of teeth as well as intra-oral scanners and CAD/CAM digital services used in dentistry, orthodontics, and the storage of dental records. Align's share price 6 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 declined significantly just after mid-year in 2019 after the company reported disappointing June quarterly results that showed top-line growth slowing to below investor expectations. The growth slowdown was the result of a combination of higher discounts to domestic customers and an unexpected slowdown in top-line growth from customers in China. We exited the Fund's position in Align in the third calendar quarter of 2019. On the positive side, the four portfolio holdings that made the biggest positive contributions to the Fund's benchmark-relative performance during the 12-month period were Loxo Oncology and Reata Pharmaceuticals, both in health care, industrials holding Generac, and information technology holding Worldpay. Loxo Oncology is a researcher and developer of cancer drugs. The company's share price appreciably rose in January 2019 after it agreed to be acquired by Eli Lilly (not a Fund holding). We eliminated the Fund's Loxo position in the first quarter of 2019. Reata Pharmaceuticals is a biotechnology company that develops small-molecule therapeutics with novel mechanisms of action used in the treatment of severe life-threatening diseases. Reata's share price rose in October 2019 after the company announced a successful trial of an experimental medicine known as Omaveloxoloine, which is used to treat a rare genetic disease (Friedreich's Ataxia). The successful trial potentially sets Reata on course to have the first drug approved for the treatment of the life-shortening neuromuscular disease. We have retained the Fund's Reata position. Shares of Generac, a leading manufacturer of residential standby and portable generators, rose during the 12-month period as the company's sales benefited from a market-penetration opportunity created by the California wildfires. In addition, we believe the company can benefit over the long term from the tailwinds of clean energy and 5G infrastructure, where Generac's products have been seeing increased usage. Generac continues to be a core holding in the Fund's portfolio. Finally, shares of Worldpay, a leading global payments processing company, rose in price during the 12-month period as it reported strong financial results and also received investor support for the announcement of its decision to merge with Fidelity Information Services. The combination of the two companies was completed in July 2019, with Fidelity Information Services becoming the surviving entity. The Fund owned shares of both companies prior to the merger, and continues to own a substantial stake in the combined entity operating under the Fidelity Information Services name. We believe the transaction may result in significant cost and revenue synergies. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 7 Q Did the Fund have any derivatives exposure during the 12-month period ended November 30, 2019? A No, the Fund had no exposure to derivative securities during the 12-month period. Q What is your outlook as the Fund heads into a new fiscal year? A The U.S. economy slowed modestly over the last 12 months from the pace it had exhibited in the prior year. That said, central banks around the globe have stepped in to provide substantial liquidity, and we believe the prospect of continued global central-bank support should be a positive for U.S. equities going forward. Additionally, as we noted earlier, a potential "phase-one" trade truce between the U.S. and China may begin to mend business confidence and could result in a bottoming of manufacturing activity in the U.S. and other regions. We feel that the most likely scenario is that the U.S. economy avoids a recession in 2020 and that moderate growth rates are likely to remain the case for the foreseeable future, with the Fed "having our back." In the slower, but stable economic environment that we expect, we believe investors are likely to favor stocks of secular growth companies that are not dependent on positive macroeconomic conditions in order to flourish. We also believe that market participants may be willing to pay a premium for shares of companies that can exhibit sustainable growth characteristics and innovation -- characteristics found in the types of equities that we favor holding in the Fund's portfolio. 8 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 Please refer to the Schedule of Investments on pages 19-25 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. Investments in mid-sized companies may offer the potential for higher returns, but are also subject to greater short-term price fluctuations than investments in larger, more established companies. When interest rates rise, the prices of fixed-income securities in the fund will generally fall. Conversely, when interest rates fall, the prices of fixed-income securities in the fund will generally rise. The portfolio invests in REIT securities, the value of which can fall for a variety of reasons, such as declines in rental income, fluctuating interest rates, poor property management, environmental liabilities, uninsured damage, increased competition, or changes in real estate tax laws. Investing in foreign and/or emerging markets securities involves risks relating to interest rates, currency exchange rates, economic, and political conditions. 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 Amundi Pioneer Asset Management, Inc., for a prospectus or summary prospectus containing this information. Read it carefully. Any information in this shareholder report regarding market or economic trends or the factors influencing the Fund's historical or future performance are statements of opinion as of the date of this report. Past performance is no guarantee of future results. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 9 Portfolio Summary | 11/30/19 Portfolio Diversification -------------------------------------------------------------------------------- (As a percentage of total investments)* [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Common Stocks 100.0% Sector Distribution -------------------------------------------------------------------------------- (As a percentage of total investments)* [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Information Technology 32.9% Industrials 18.0% Health Care 16.1% Consumer Discretionary 13.5% Communication Services 5.4% Financials 4.9% Materials 3.4% Real Estate 2.4% Consumer Staples 2.1% Energy 1.3% 10 Largest Holdings -------------------------------------------------------------------------------- (As a percentage of total investments)* 1. Fidelity National Information Services, Inc. 2.43% -------------------------------------------------------------------------------- 2. Global Payments, Inc. 2.23 -------------------------------------------------------------------------------- 3. IAC/InterActiveCorp 1.99 -------------------------------------------------------------------------------- 4. Advanced Micro Devices, Inc. 1.76 -------------------------------------------------------------------------------- 5. FleetCor Technologies, Inc. 1.67 -------------------------------------------------------------------------------- 6. Veeva Systems, Inc. 1.63 -------------------------------------------------------------------------------- 7. Generac Holdings, Inc. 1.61 -------------------------------------------------------------------------------- 8. SS&C Technologies Holdings, Inc. 1.61 -------------------------------------------------------------------------------- 9. MSCI, Inc. 1.60 -------------------------------------------------------------------------------- 10. Reata Pharmaceuticals, Inc. 1.58 -------------------------------------------------------------------------------- * Excludes temporary cash investments and all derivative contracts except for options purchased. The Fund is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any securities. 10 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 Prices and Distributions | 11/30/19 Net Asset Value per Share -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Class 11/30/19 11/30/18 -------------------------------------------------------------------------------- A $44.42 $37.99 -------------------------------------------------------------------------------- C $30.29 $26.28 -------------------------------------------------------------------------------- K $45.42 $38.69 -------------------------------------------------------------------------------- R $42.19 $36.24 -------------------------------------------------------------------------------- Y $48.78 $41.57 -------------------------------------------------------------------------------- Distributions per Share: 12/1/18-11/30/19 -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains -------------------------------------------------------------------------------- A $ -- $ -- $0.6166 -------------------------------------------------------------------------------- C $ -- $ -- $0.6166 -------------------------------------------------------------------------------- K $ -- $ -- $0.6166 -------------------------------------------------------------------------------- R $ -- $ -- $0.6166 -------------------------------------------------------------------------------- Y $ -- $ -- $0.6166 -------------------------------------------------------------------------------- Index Definition -------------------------------------------------------------------------------- The Russell Midcap Growth Index is an unmanaged index that measures the performance of U.S. mid-cap 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 12-16. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 11 Performance Update | 11/30/19 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 Select Mid Cap Growth Fund at public offering price during the periods shown, compared to that of the Russell Midcap Growth Index. Average Annual Total Returns (As of November 30, 2019) --------------------------------------------------- Net Public Russell Asset Offering Midcap Value Price Growth Period (NAV) (POP) Index --------------------------------------------------- 10 Years 13.55% 12.88% 14.79% 5 Years 10.89 9.59 11.28 1 Year 18.54 11.73 21.75 --------------------------------------------------- Expense Ratio (Per prospectus dated April 1, 2019) --------------------------------------------------- Gross --------------------------------------------------- 1.02% --------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Select Mid Russell Cap Growth Midcap Fund Growth Index 11/09 $ 9,425 $10,000 11/10 $11,397 $12,633 11/11 $12,057 $13,399 11/12 $12,913 $15,016 11/13 $17,682 $20,108 11/14 $20,033 $23,284 11/15 $20,660 $23,708 11/16 $21,085 $24,784 11/17 $26,969 $30,987 11/18 $28,341 $32,635 11/19 $33,596 $39,734 Call 1-800-225-6292 or visit www.amundipioneer.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. NAV results represent the percent change in net asset value per share. POP returns reflect deduction of maximum 5.75% sales charge. NAV returns would have been lower had sales charges been reflected. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. The Fund acquired the assets and liabilities of Pioneer Select Mid Cap 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. 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. 12 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 Performance Update | 11/30/19 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 Select Mid Cap Growth Fund during the periods shown, compared to that of the Russell Midcap Growth Index. Average Annual Total Returns (As of November 30, 2019) --------------------------------------------------- Russell Midcap If If Growth Period Held Redeemed Index --------------------------------------------------- 10 Years 12.59% 12.59% 14.79% 5 Years 10.01 10.01 11.28 1 Year 17.60 17.60 21.75 --------------------------------------------------- Expense Ratio (Per prospectus dated April 1, 2019) --------------------------------------------------- Gross --------------------------------------------------- 1.78% --------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Select Mid Russell Cap Growth Midcap Fund Growth Index 11/09 $10,000 $10,000 11/10 $11,979 $12,633 11/11 $12,554 $13,399 11/12 $13,313 $15,016 11/13 $18,074 $20,108 11/14 $20,309 $23,284 11/15 $20,774 $23,708 11/16 $21,035 $24,784 11/17 $26,692 $30,987 11/18 $27,825 $32,635 11/19 $32,722 $39,734 Call 1-800-225-6292 or visit www.amundipioneer.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Class C shares held for less than one year are also subject to a 1% contingent deferred sales charge (CDSC). "If Held" results represent the percent change in net asset value per share. NAV returns would have been lower had sales charges been reflected. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. The Fund acquired the assets and liabilities of Pioneer Select Mid Cap 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. 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. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 13 Performance Update | 11/30/19 Class K Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 million investment made in Class K shares of Pioneer Select Mid Cap Growth Fund during the periods shown, compared to that of the Russell Midcap Growth Index. Average Annual Total Returns (As of November 30, 2019) --------------------------------------------------- Net Russell Asset Midcap Value Growth Period (NAV) Index --------------------------------------------------- 10 Years 13.76% 14.79% 5 Years 11.30 11.28 1 Year 18.98 21.75 --------------------------------------------------- Expense Ratio (Per prospectus dated April 1, 2019) --------------------------------------------------- Gross --------------------------------------------------- 0.66% --------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $5 Million Investment Pioneer Select Mid Russell Cap Growth Midcap Fund Growth Index 11/09 $ 5,000,000 $ 5,000,000 11/10 $ 6,046,176 $ 6,316,401 11/11 $ 6,396,104 $ 6,699,740 11/12 $ 6,850,649 $ 7,507,952 11/13 $ 9,380,538 $10,053,794 11/14 $10,627,788 $11,642,060 11/15 $10,997,328 $11,853,770 11/16 $11,269,928 $12,391,862 11/17 $14,466,114 $15,493,522 11/18 $15,254,596 $16,317,635 11/19 $18,150,555 $19,866,861 Call 1-800-225-6292 or visit www.amundipioneer.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. The performance shown for Class K shares for the period prior to the commencement of operations of Class K shares on December 31, 2014, is the net asset value performance of the Fund's Class A shares, which has not been restated to reflect any differences in expenses, including Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares generally are higher than those of Class K shares, the performance of Class K shares prior to their inception would have been higher than the performance shown. For the period beginning December 31, 2014, the actual performance of Class K shares is reflected. Class K shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. 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 Select Mid Cap 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. 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. 14 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 Performance Update | 11/30/19 Class R Shares Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Class R shares of Pioneer Select Mid Cap Growth Fund during the periods shown, compared to that of the Russell Midcap Growth Index. Average Annual Total Returns (As of November 30, 2019) --------------------------------------------------- Net Russell Asset Midcap Value Growth Period (NAV) Index --------------------------------------------------- 10 Years 13.27% 14.79% 5 Years 10.47 11.28 1 Year 18.12 21.75 --------------------------------------------------- Expense Ratio (Per prospectus dated April 1, 2019) --------------------------------------------------- Gross --------------------------------------------------- 1.44% --------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Select Mid Russell Cap Growth Midcap Fund Growth Index 11/09 $10,000 $10,000 11/10 $12,092 $12,633 11/11 $12,792 $13,399 11/12 $13,701 $15,016 11/13 $18,728 $20,108 11/14 $21,135 $23,284 11/15 $21,716 $23,708 11/16 $22,086 $24,784 11/17 $28,130 $30,987 11/18 $29,437 $32,635 11/19 $34,769 $39,734 Call 1-800-225-6292 or visit www.amundipioneer.com/us 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 R shares are not subject to sales charges and are available for limited groups of eligible 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. The Fund acquired the assets and liabilities of Pioneer Select Mid Cap 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. The predecessor fund did not offer Class R shares. Accordingly, the performance of Class R shares of the Fund is the performance of Class A shares of the predecessor fund for periods prior to the reorganization, restated to reflect the higher distribution and service fees of Class R shares, but not other differences in expenses. Please refer to the financial highlights for a more current expense ratio. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 15 Performance Update | 11/30/19 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 Select Mid Cap Growth Fund during the periods shown, compared to that of the Russell Midcap Growth Index. Average Annual Total Returns (As of November 30, 2019) --------------------------------------------------- Net Russell Asset Midcap Value Growth Period (NAV) Index --------------------------------------------------- 10 Years 13.92% 14.79% 5 Years 11.17 11.28 1 Year 18.82 21.75 --------------------------------------------------- Expense Ratio (Per prospectus dated April 1, 2019) --------------------------------------------------- Gross --------------------------------------------------- 0.78% --------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $5 Million Investment Pioneer Select Mid Russell Cap Growth Midcap Fund Growth Index 11/09 $ 5,000,000 $ 5,000,000 11/10 $ 6,072,443 $ 6,316,401 11/11 $ 6,448,864 $ 6,699,740 11/12 $ 6,938,920 $ 7,507,952 11/13 $ 9,533,566 $10,053,794 11/14 $10,839,010 $11,642,060 11/15 $11,209,073 $11,853,770 11/16 $11,470,492 $12,391,862 11/17 $14,703,028 $15,493,522 11/18 $15,491,045 $16,317,635 11/19 $18,407,013 $19,866,861 Call 1-800-225-6292 or visit www.amundipioneer.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Class Y shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The 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 Select Mid Cap 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. 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. Please refer to the financial highlights for a more current expense ratio. 16 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 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 Select Mid Cap Growth Fund Based on actual returns from June 1, 2019 through November 30, 2019. ------------------------------------------------------------------------------------------- Share Class A C K R Y ------------------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 6/1/19 ------------------------------------------------------------------------------------------- Ending Account $1,110.34 $1,105.78 $1,112.17 $1,109.32 $1,111.71 Value (after expenses) on 11/30/19 ------------------------------------------------------------------------------------------- Expenses Paid $5.45 $9.77 $3.55 $7.40 $4.18 During Period* ------------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 1.03%, 1.85%, 0.67%, 1.40% and 0.79% for Class A, Class C, Class K, Class R and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 183/365 (to reflect the partial year period). Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 17 Hypothetical Example for Comparison Purposes The table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the tables are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as sales charges (loads) that are charged at the time of the transaction. Therefore, the table below is useful in comparing ongoing costs only and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher. Expenses Paid on a $1,000 Investment in Pioneer Select Mid Cap Growth Fund Based on a hypothetical 5% return per year before expenses, reflecting the period from June 1, 2019 through November 30, 2019. ------------------------------------------------------------------------------------------- Share Class A C K R Y ------------------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 6/1/19 ------------------------------------------------------------------------------------------- Ending Account $1,019.90 $1,015.79 $1,021.71 $1,018.05 $1,021.11 Value (after expenses) on 11/30/19 ------------------------------------------------------------------------------------------- Expenses Paid $5.22 $9.35 $3.40 $7.08 $4.00 During Period* ------------------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio of 1.03%, 1.85%, 0.67%, 1.40% and 0.79% for Class A, Class C, Class K, Class R and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 183/365 (to reflect the partial year period). 18 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 Schedule of Investments | 11/30/19 ---------------------------------------------------------------------------------------------- Shares Value ---------------------------------------------------------------------------------------------- UNAFFILIATED ISSUERS -- 99.3% COMMON STOCKS -- 99.3% of Net Assets Aerospace & Defense -- 2.0% 147,988 L3Harris Technologies, Inc. $ 29,758,907 37,719(a) Teledyne Technologies, Inc. 12,899,521 -------------- Total Aerospace & Defense $ 42,658,428 ---------------------------------------------------------------------------------------------- Air Freight & Logistics -- 0.7% 182,871(a) XPO Logistics, Inc. $ 15,121,603 -------------- Total Air Freight & Logistics $ 15,121,603 ---------------------------------------------------------------------------------------------- Auto Components -- 0.7% 150,316 Aptiv Plc $ 14,111,666 -------------- Total Auto Components $ 14,111,666 ---------------------------------------------------------------------------------------------- Banks -- 0.5% 47,745(a) SVB Financial Group $ 11,063,949 -------------- Total Banks $ 11,063,949 ---------------------------------------------------------------------------------------------- Beverages -- 0.6% 67,985 Constellation Brands, Inc. $ 12,649,289 -------------- Total Beverages $ 12,649,289 ---------------------------------------------------------------------------------------------- Biotechnology -- 5.2% 134,633(a) Alnylam Pharmaceuticals, Inc. $ 15,770,910 302,221(a) Esperion Therapeutics, Inc. 15,522,070 253,614(a) Exact Sciences Corp. 20,545,270 387,525(a) FibroGen, Inc. 16,419,434 162,941(a) Sage Therapeutics, Inc. 25,218,379 159,574(a) Sarepta Therapeutics, Inc. 17,950,479 -------------- Total Biotechnology $ 111,426,542 ---------------------------------------------------------------------------------------------- Building Products -- 2.5% 279,290 Fortune Brands Home & Security, Inc. $ 17,667,885 317,146 Owens Corning 21,267,811 184,400(a) Trex Co., Inc. 15,869,464 -------------- Total Building Products $ 54,805,160 ---------------------------------------------------------------------------------------------- Capital Markets -- 3.8% 132,031 MSCI, Inc. $ 34,221,115 165,760 Nasdaq, Inc. 17,371,648 40,815 S&P Global, Inc. 10,801,690 450,456 Tradeweb Markets, Inc. 20,148,897 -------------- Total Capital Markets $ 82,543,350 ---------------------------------------------------------------------------------------------- Chemicals -- 0.7% 140,067 Albemarle Corp. $ 9,157,581 64,842(a) Ingevity Corp. 5,855,881 -------------- Total Chemicals $ 15,013,462 ---------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 19 Schedule of Investments | 11/30/19 (continued) ---------------------------------------------------------------------------------------------- Shares Value ---------------------------------------------------------------------------------------------- Commercial Services & Supplies -- 0.8% 197,545 Waste Connections, Inc. $ 17,887,700 -------------- Total Commercial Services & Supplies $ 17,887,700 ---------------------------------------------------------------------------------------------- Communications Equipment -- 0.2% 25,170(a) Arista Networks, Inc. $ 4,911,422 -------------- Total Communications Equipment $ 4,911,422 ---------------------------------------------------------------------------------------------- Construction Materials -- 0.9% 142,266 Vulcan Materials Co. $ 20,183,277 -------------- Total Construction Materials $ 20,183,277 ---------------------------------------------------------------------------------------------- Consumer Discretionary -- 1.1% 151,698 Dollar General Corp. $ 23,871,197 -------------- Total Consumer Discretionary $ 23,871,197 ---------------------------------------------------------------------------------------------- Containers & Packaging -- 1.5% 109,946 Avery Dennison Corp. $ 14,333,660 213,681(a) Crown Holdings, Inc. 16,218,388 -------------- Total Containers & Packaging $ 30,552,048 ---------------------------------------------------------------------------------------------- Diversified Consumer Services -- 0.2% 126,798(a) ServiceMaster Global Holdings, Inc. $ 4,969,214 -------------- Total Diversified Consumer Services $ 4,969,214 ---------------------------------------------------------------------------------------------- Electrical Equipment -- 2.8% 349,988(a) Generac Holdings, Inc. $ 34,473,818 128,702 Rockwell Automation, Inc. 25,205,000 -------------- Total Electrical Equipment $ 59,678,818 ---------------------------------------------------------------------------------------------- Electronic Equipment, Instruments & Components -- 1.6% 204,358 CDW Corp. $ 27,598,548 21,866(a) Zebra Technologies Corp. 5,487,054 -------------- Total Electronic Equipment, Instruments & Components $ 33,085,602 ---------------------------------------------------------------------------------------------- Energy Equipment & Services -- 0.7% 484,708 Cactus, Inc. $ 14,633,334 -------------- Total Energy Equipment & Services $ 14,633,334 ---------------------------------------------------------------------------------------------- Entertainment -- 1.9% 462,345(a) Live Nation Entertainment, Inc. $ 32,276,305 58,358(a) Roku, Inc. 9,358,872 -------------- Total Entertainment $ 41,635,177 ---------------------------------------------------------------------------------------------- Equity Real Estate Investment Trusts (REITs) -- 2.3% 410,006 Americold Realty Trust $ 15,424,426 269,055 Liberty Property Trust 16,579,169 77,424 SBA Communications Corp. 18,308,453 -------------- Total Equity Real Estate Investment Trusts (REITs) $ 50,312,048 ---------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 20 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 ---------------------------------------------------------------------------------------------- Shares Value ---------------------------------------------------------------------------------------------- Food & Staples Retailing -- 0.5% 245,286(a) Performance Food Group Co. $ 11,543,159 -------------- Total Food & Staples Retailing $ 11,543,159 ---------------------------------------------------------------------------------------------- Food Products -- 1.0% 1,011,601(a) Nomad Foods, Ltd. $ 21,243,621 -------------- Total Food Products $ 21,243,621 ---------------------------------------------------------------------------------------------- Health Care Equipment & Supplies -- 3.0% 142,158(a) DexCom, Inc. $ 32,313,935 69,054(a) Penumbra, Inc. 12,217,034 55,209 Teleflex, Inc. 19,507,548 -------------- Total Health Care Equipment & Supplies $ 64,038,517 ---------------------------------------------------------------------------------------------- Health Care Providers & Services -- 3.5% 112,673(a) Amedisys, Inc. $ 18,361,192 259,157(a) Centene Corp. 15,671,224 64,265 McKesson Corp. 9,295,290 71,180 Universal Health Services, Inc., Class B 9,928,898 73,713(a) WellCare Health Plans, Inc. 23,740,746 -------------- Total Health Care Providers & Services $ 76,997,350 ---------------------------------------------------------------------------------------------- Health Care Technology -- 2.4% 205,141(a) Teladoc Health, Inc. $ 17,178,507 233,462(a) Veeva Systems, Inc. 34,827,861 -------------- Total Health Care Technology $ 52,006,368 ---------------------------------------------------------------------------------------------- Hotels, Restaurants & Leisure -- 4.5% 302,064 Aramark $ 13,182,073 328,182 Brinker International, Inc. 14,702,554 16,082(a) Chipotle Mexican Grill, Inc. 13,089,461 137,792 Hilton Worldwide Holdings, Inc. 14,468,160 154,435(a) Planet Fitness, Inc. 11,415,835 899,505 Wendy's Co. 19,285,387 234,889 Yum China Holdings, Inc. 10,457,258 -------------- Total Hotels, Restaurants & Leisure $ 96,600,728 ---------------------------------------------------------------------------------------------- Household Durables -- 1.4% 192,626 Dr Horton, Inc. $ 10,661,849 150,563 KB Home 5,206,469 140,500(a) TopBuild Corp. 15,494,340 -------------- Total Household Durables $ 31,362,658 ---------------------------------------------------------------------------------------------- Industrial Conglomerates -- 0.7% 40,087 Roper Technologies, Inc. $ 14,446,152 -------------- Total Industrial Conglomerates $ 14,446,152 ---------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 21 Schedule of Investments | 11/30/19 (continued) ---------------------------------------------------------------------------------------------- Shares Value ---------------------------------------------------------------------------------------------- Insurance -- 0.6% 252,201 Fidelity National Financial, Inc. $ 12,012,334 -------------- Total Insurance $ 12,012,334 ---------------------------------------------------------------------------------------------- Interactive Media & Services -- 2.8% 190,846(a) IAC/InterActiveCorp $ 42,501,404 567,467(a) Twitter, Inc. 17,540,405 -------------- Total Interactive Media & Services $ 60,041,809 ---------------------------------------------------------------------------------------------- Internet & Direct Marketing Retail -- 0.4% 82,745 Expedia Group, Inc. $ 8,411,857 -------------- Total Internet & Direct Marketing Retail $ 8,411,857 ---------------------------------------------------------------------------------------------- IT Services -- 12.7% 106,996(a) EPAM Systems, Inc. $ 22,667,102 92,406(a) Euronet Worldwide, Inc. 14,525,299 377,042 Fidelity National Information Services, Inc. 52,088,352 267,758(a) Fiserv, Inc. 31,124,190 116,366(a) FleetCor Technologies, Inc. 35,715,053 44,485(a) Gartner, Inc. 7,138,063 326,922 Genpact, Ltd. 13,305,725 263,514 Global Payments, Inc. 47,722,385 165,916(a) InterXion Holding NV 14,109,497 206,158 Perspecta, Inc. 5,685,838 139,621(a) WEX, Inc. 28,081,972 -------------- Total IT Services $ 272,163,476 ---------------------------------------------------------------------------------------------- Machinery -- 3.9% 282,421 Albany International Corp. $ 23,632,989 1,350,235(a) ATS Automation Tooling Systems, Inc. 20,028,723 96,725(a) Chart Industries, Inc. 5,339,220 90,259 Nordson Corp. 14,967,650 124,595 Stanley Black & Decker, Inc. 19,653,616 -------------- Total Machinery $ 83,622,198 ---------------------------------------------------------------------------------------------- Materials -- 0.3% 71,615 FMC Corp. $ 7,015,405 -------------- Total Materials $ 7,015,405 ---------------------------------------------------------------------------------------------- Media -- 0.7% 134,503 Nexstar Media Group, Inc. $ 14,487,318 -------------- Total Media $ 14,487,318 ---------------------------------------------------------------------------------------------- Multiline Retail -- 0.4% 102,056(a) Dollar Tree, Inc. $ 9,334,042 -------------- Total Multiline Retail $ 9,334,042 ---------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 22 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 ---------------------------------------------------------------------------------------------- Shares Value ---------------------------------------------------------------------------------------------- Oil, Gas & Consumable Fuels -- 0.6% 410,370 PBF Energy, Inc. $ 12,844,581 -------------- Total Oil, Gas & Consumable Fuels $ 12,844,581 ---------------------------------------------------------------------------------------------- Pharmaceuticals -- 1.9% 81,824(a) Medicines Co. $ 6,889,581 172,950(a) Reata Pharmaceuticals, Inc. 33,747,733 -------------- Total Pharmaceuticals $ 40,637,314 ---------------------------------------------------------------------------------------------- Professional Services -- 4.5% 1,441,721(a) Clarivate Analytics Plc $ 25,922,144 23,646(a) CoStar Group, Inc. 14,491,688 475,319 Thomson Reuters Corp. 33,533,755 152,756 Verisk Analytics, Inc. 22,528,455 -------------- Total Professional Services $ 96,476,042 ---------------------------------------------------------------------------------------------- Semiconductors & Semiconductor Equipment -- 6.9% 959,836(a) Advanced Micro Devices, Inc. $ 37,577,579 771,714 Cypress Semiconductor Corp. 18,096,693 641,513(a) Micron Technology, Inc. 30,478,283 198,701 MKS Instruments, Inc. 21,117,942 108,146 NXP Semiconductors NV 12,499,515 670,921(a) ON Semiconductor Corp. 14,404,674 152,432 Xilinx, Inc. 14,142,641 -------------- Total Semiconductors & Semiconductor Equipment $ 148,317,327 ---------------------------------------------------------------------------------------------- Software -- 11.3% 103,148(a) Atlassian Corp. Plc $ 13,111,142 39,367(a) HubSpot, Inc. 5,944,417 106,444 Intuit, Inc. 27,557,287 34,310(a) Palo Alto Networks, Inc. 7,795,918 50,142(a) Paycom Software, Inc. 13,879,807 142,869(a) Rapid7, Inc. 8,010,665 298,319(a) RealPage, Inc. 16,416,495 110,596(a) ServiceNow, Inc. 31,303,092 133,524(a) Splunk, Inc. 19,924,451 573,158 SS&C Technologies Holdings, Inc. 34,418,138 199,704(a) Synopsys, Inc. 28,166,252 73,875(a) Trade Desk, Inc. 19,454,243 241,375(a) Zendesk, Inc. 19,068,625 -------------- Total Software $ 245,050,532 ---------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 23 Schedule of Investments | 11/30/19 (continued) ---------------------------------------------------------------------------------------------- Shares Value ---------------------------------------------------------------------------------------------- Specialty Retail -- 4.1% 141,412 Aaron's, Inc. $ 8,258,461 32,263 Advance Auto Parts, Inc. 5,067,872 118,695(a) Burlington Stores, Inc. 26,706,375 64,863(a) CarMax, Inc. 6,308,575 201,521 Ross Stores, Inc. 23,406,664 150,278 Tractor Supply Co. 14,192,254 17,798(a) Ulta Beauty, Inc. 4,162,240 -------------- Total Specialty Retail $ 88,102,441 ---------------------------------------------------------------------------------------------- Textiles, Apparel & Luxury Goods -- 0.5% 51,256(a) Lululemon Athletica, Inc. $ 11,567,967 -------------- Total Textiles, Apparel & Luxury Goods $ 11,567,967 ---------------------------------------------------------------------------------------------- TOTAL COMMON STOCKS (Cost $1,523,332,669) $2,139,436,482 ---------------------------------------------------------------------------------------------- TOTAL INVESTMENTS IN UNAFFILIATED ISSUERS -- 99.3% (Cost $1,523,332,669) $2,139,436,482 ---------------------------------------------------------------------------------------------- OTHER ASSETS AND LIABILITIES -- 0.7% $ 14,072,743 ---------------------------------------------------------------------------------------------- NET ASSETS -- 100.0% $2,153,509,225 ============================================================================================== REIT Real Estate Investment Trust. (a) Non-income producing security. Purchases and sales of securities (excluding temporary cash investments) for the year ended November 30, 2019, aggregated $1,086,865,581 and $1,041,963,204, respectively. The Fund is permitted to engage in purchase and sale transactions ("cross trades") with certain funds and accounts for which Amundi Pioneer Asset Management, Inc. (the "Adviser") serves as the Fund's investment adviser, as set forth in Rule 17a-7 under the Investment Company Act of 1940, pursuant to procedures adopted by the Board of Trustees. Under these procedures, cross trades are effected at current market prices. During the year ended November 30, 2019, the Fund did not engage in any cross trade activity. At November 30, 2019, the net unrealized appreciation on investments based on cost for federal tax purposes of $1,530,722,561 was as follows: Aggregate gross unrealized appreciation for all investments in which there is an excess of value over tax cost $ 631,327,812 Aggregate gross unrealized depreciation for all investments in which there is an excess of tax cost over value (22,613,891) ------------- Net unrealized appreciation $ 608,713,921 ============= Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels below. Level 1 - quoted prices in active markets for identical securities. Level 2 - other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.). See Notes to Financial Statements -- Note 1A. Level 3 - significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments). See Notes to Financial Statements -- Note 1A. The accompanying notes are an integral part of these financial statements. 24 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 The following is a summary of the inputs used as of November 30, 2019, in valuing the Fund's investments: ---------------------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total ---------------------------------------------------------------------------------------------- Common Stocks $2,139,436,482 $ -- $ -- $2,139,436,482 ---------------------------------------------------------------------------------------------- Total Investments in Securities $2,139,436,482 $ -- $ -- $2,139,436,482 ============================================================================================== During the year ended November 30, 2019, there were no transfers between Levels 1, 2 and 3. The accompanying notes are an integral part of these financial statements. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 25 Statement of Assets and Liabilities | 11/30/19 ASSETS: Investments in unaffiliated issuers, at value (cost $1,523,332,669) $2,139,436,482 Cash 624,502 Foreign currencies, at value (cost $6,069) 6,053 Receivables -- Investment securities sold 14,772,669 Fund shares sold 1,136,914 Dividends 1,267,847 Other assets 70,548 ----------------------------------------------------------------------------------------------- Total assets $2,157,315,015 =============================================================================================== LIABILITIES: Payables -- Investment securities purchased $ 1,088,558 Fund shares repurchased 1,497,150 Trustees' fees 18,173 Transfer agent fees 552,972 Registration fees 101,696 Due to affiliates Management fees 278,623 Other due to affiliates 87,367 Accrued expenses 181,251 ----------------------------------------------------------------------------------------------- Total liabilities $ 3,805,790 =============================================================================================== NET ASSETS: Paid-in capital $1,531,688,728 Distributable earnings 621,820,497 ----------------------------------------------------------------------------------------------- Net assets $2,153,509,225 =============================================================================================== NET ASSET VALUE PER SHARE: No par value (unlimited number of shares authorized) Class A (based on $1,252,845,112/28,205,929 shares) $ 44.42 Class C (based on $40,050,762/1,322,053 shares) $ 30.29 Class K (based on $160,784,902/3,539,771 shares) $ 45.42 Class R (based on $17,484,419/414,414 shares) $ 42.19 Class Y (based on $682,344,030/13,988,872 shares) $ 48.78 MAXIMUM OFFERING PRICE PER SHARE: Class A (based on $44.42 net asset value per share/100%-5.75% maximum sales charge) $ 47.13 =============================================================================================== The accompanying notes are an integral part of these financial statements. 26 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 Statement of Operations FOR THE YEAR ENDED 11/30/19 INVESTMENT INCOME: Dividends from unaffiliated issuers (net of foreign taxes withheld $136,341) $ 11,130,870 Interest from unaffiliated issuers 503,756 -------------------------------------------------------------------------------------------------- Total investment income $ 11,634,626 ================================================================================================== EXPENSES: Management fees $ 11,797,855 Administrative expense 670,151 Transfer agent fees Class A 1,170,870 Class C 61,739 Class K 3,695 Class R 35,791 Class Y 817,928 Distribution fees Class A 2,959,684 Class C 403,927 Class R 86,863 Shareowner communications expense 311,559 Custodian fees 33,979 Registration fees 202,364 Professional fees 128,354 Printing expense 30,503 Pricing fees 67 Trustees' fees 97,085 Insurance expense 23,203 Miscellaneous 97,229 -------------------------------------------------------------------------------------------------- Total expenses $ 18,932,846 -------------------------------------------------------------------------------------------------- Net investment loss $ (7,298,220) -------------------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS: Net realized gain (loss) on: Investments in unaffiliated issuers $ 55,297,717 Other assets and liabilities denominated in foreign currencies 7,188 $ 55,304,905 -------------------------------------------------------------------------------------------------- Change in net unrealized appreciation (depreciation) on: Investments in unaffiliated issuers $292,959,161 Other assets and liabilities denominated in foreign currencies 29 $292,959,190 -------------------------------------------------------------------------------------------------- Net realized and unrealized gain (loss) on investments $348,264,095 -------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $340,965,875 ================================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 27 Statements of Changes in Net Assets ---------------------------------------------------------------------------------------------------- Year Year Ended Ended 11/30/19 11/30/18 ---------------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income (loss) $ (7,298,220) $ (7,126,329) Net realized gain (loss) on investments 55,304,905 196,455,316 Change in net unrealized appreciation (depreciation) on investments 292,959,190 (117,512,754) ---------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 340,965,875 $ 71,816,233 ---------------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Class A ($0.62 and $5.51 per share, respectively) $ (17,185,164) $ (143,556,531) Class C ($0.62 and $5.51 per share, respectively) (799,300) (7,160,458) Class K ($0.62 and $5.51 per share, respectively) (2,150,704) (6,535,713) Class R ($0.62 and $5.51 per share, respectively) (251,089) (2,550,557) Class Y ($0.62 and $5.51 per share, respectively) (8,527,630) (62,678,957) ---------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (28,913,887) $ (222,482,216) ---------------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sales of shares $ 404,457,928 $ 486,524,930 Reinvestment of distributions 26,869,067 205,882,519 Cost of shares repurchased (360,575,960) (350,297,199) ---------------------------------------------------------------------------------------------------- Net increase in net assets resulting from Fund share transactions $ 70,751,035 $ 342,110,250 ---------------------------------------------------------------------------------------------------- Net increase in net assets $ 382,803,023 $ 191,444,267 NET ASSETS: Beginning of year $1,770,706,202 $1,579,261,935 ---------------------------------------------------------------------------------------------------- End of year $2,153,509,225 $1,770,706,202 ==================================================================================================== The accompanying notes are an integral part of these financial statements. 28 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 --------------------------------------------------------------------------------------------------- Year Ended Year Ended Year Ended Year Ended 11/30/19 11/30/19 11/30/18 11/30/18 Shares Amount Shares Amount --------------------------------------------------------------------------------------------------- Class A Shares sold 1,750,568 $ 71,121,113 2,572,411 $ 114,247,632 Reinvestment of distributions 368,191 16,398,868 3,626,698 136,908,029 Less shares repurchased (3,528,114) (144,220,734) (3,722,577) (163,953,540) --------------------------------------------------------------------------------------------------- Net increase (decrease) (1,409,355) $ (56,700,753) 2,476,532 $ 87,202,121 =================================================================================================== Class C Shares sold 328,982 $ 8,844,469 493,058 $ 16,119,837 Reinvestment of distributions 23,868 725,186 230,233 6,013,689 Less shares repurchased (589,009) (16,195,188) (1,226,631) (41,733,534) --------------------------------------------------------------------------------------------------- Net decrease (236,159) $ (6,625,533) (503,340) $ (19,600,008) =================================================================================================== Class K Shares sold 2,847,859 $ 116,414,583 807,805 $ 36,547,459 Reinvestment of distributions 41,268 1,879,358 150,492 5,786,423 Less shares repurchased (713,114) (30,330,153) (171,000) (7,639,875) --------------------------------------------------------------------------------------------------- Net increase 2,176,013 $ 87,963,788 787,297 $ 34,694,007 =================================================================================================== Class R Shares sold 227,625 $ 8,383,567 230,454 $ 9,548,711 Reinvestment of distributions 5,807 245,589 52,413 1,887,905 Less shares repurchased (352,693) (13,063,403) (678,123) (28,114,194) -------------------------------------------------------------------------------------------------- Net decrease (119,261) $ (4,434,247) (395,256) $ (16,677,578) =================================================================================================== Class Y Shares sold 4,565,272 $ 199,694,196 6,349,307 $ 310,061,291 Reinvestment of distributions 155,798 7,620,066 1,338,331 55,286,473 Less shares repurchased (3,547,395) (156,766,482) (2,269,088) (108,856,056) --------------------------------------------------------------------------------------------------- Net increase 1,173,675 $ 50,547,780 5,418,550 $ 256,491,708 =================================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 29 Financial Highlights ------------------------------------------------------------------------------------------------------------------------------------ Year Year Year Year Year Ended Ended Ended Ended Ended 11/30/19 11/30/18 11/30/17 11/30/16* 11/30/15* ------------------------------------------------------------------------------------------------------------------------------------ Class A Net asset value, beginning of period $ 37.99 $ 41.43 $ 35.13 $ 35.00 $ 36.92 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) (a) $ (0.18) $ (0.20) $ (0.12) $ (0.04) $ (0.15) Net realized and unrealized gain (loss) on investments 7.23 2.27 9.91 0.76 1.30 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 7.05 $ 2.07 $ 9.79 $ 0.72 $ 1.15 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net realized gain $ (0.62) $ (5.51) $ (3.49) $ (0.59) $ (3.07) ------------------------------------------------------------------------------------------------------------------------------------ Total distributions $ (0.62) $ (5.51) $ (3.49) $ (0.59) $ (3.07) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 6.43 $ (3.44) $ 6.30 $ 0.13 $ (1.92) ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 44.42 $ 37.99 $ 41.43 $ 35.13 $ 35.00 ==================================================================================================================================== Total return (b) 18.54% 5.09%(c) 27.90%(d) 2.06% 3.13%(e) Ratio of net expenses to average net assets 1.03% 1.02% 1.04% 1.06% 1.06% Ratio of net investment income (loss) to average net assets (0.44)% (0.45)% (0.32)% (0.12)% (0.40)% Portfolio turnover rate 53% 82% 83% 99% 91% Net assets, end of period (in thousands) $1,252,845 $1,124,956 $1,124,242 $950,638 $1,009,964 ==================================================================================================================================== * The Fund was audited by an independent registered public accounting firm other than Ernst & Young LLP. (a) The per-share data presented above is based on the average shares outstanding for the period presented. (b) Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if sales charges were taken into account. (c) If the Fund had not recognized gains in the settlement of class action lawsuits during the year ended November 30, 2018, the total return would have been 5.06%. (d) If the Fund had not recognized gains in the settlement of class action lawsuits during the year ended November 30, 2017, the total return would have been 27.88%. (e) If the Fund had not recognized gains in the settlement of class action lawsuits during the year ended November 30, 2015, the total return would have been 3.10%. The accompanying notes are an integral part of these financial statements. 30 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 ------------------------------------------------------------------------------------------------------------------------------------ Year Year Year Year Year Ended Ended Ended Ended Ended 11/30/19 11/30/18 11/30/17 11/30/16* 11/30/15* ------------------------------------------------------------------------------------------------------------------------------------ Class C Net asset value, beginning of period $ 26.28 $ 30.53 $ 26.82 $ 27.07 $ 29.47 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) (a) $ (0.36) $ (0.40) $ (0.33) $ (0.24) $ (0.37) Net realized and unrealized gain (loss) on investments 4.99 1.66 7.53 0.58 1.04 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 4.63 $ 1.26 $ 7.20 $ 0.34 $ 0.67 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net realized gain $ (0.62) $ (5.51) $ (3.49) $ (0.59) $ (3.07) ------------------------------------------------------------------------------------------------------------------------------------ Total distributions $ (0.62) $ (5.51) $ (3.49) $ (0.59) $ (3.07) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 4.01 $ (4.25) $ 3.71 $ (0.25) $ (2.40) ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 30.29 $ 26.28 $ 30.53 $ 26.82 $ 27.07 ==================================================================================================================================== Total return (b) 17.60% 4.24% 26.89% 1.26% 2.29%(c) Ratio of net expenses to average net assets 1.85% 1.78% 1.84% 1.86% 1.87% Ratio of net investment income (loss) to average net assets (1.26)% (1.22)% (1.11)% (0.92)% (1.20)% Portfolio turnover rate 53% 82% 83% 99% 91% Net assets, end of period (in thousands) $40,051 $40,956 $62,937 $58,377 $69,528 ==================================================================================================================================== * The Fund was audited by an independent registered public accounting firm other than Ernst & Young LLP. (a) The per-share data presented above is based on the average shares outstanding for the period presented. (b) Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if sales charges were taken into account. (c) If the Fund had not recognized gains in the settlement of class action lawsuits during the year ended November 30, 2015, the total return would have been 2.25%. The accompanying notes are an integral part of these financial statements. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 31 Financial Highlights (continued) ------------------------------------------------------------------------------------------------------------------------------------ Year Year Year Year Ended Ended Ended Ended 12/31/14 11/30/19 11/30/18 11/30/17 11/30/16* to 11/30/15* ------------------------------------------------------------------------------------------------------------------------------------ Class K Net asset value, beginning of period $ 38.69 $ 41.95 $ 35.41 $ 35.13 $ 37.00 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) (a) $ (0.03) $ (0.03) $ 0.01(b) $ 0.09(b) $ 0.01 Net realized and unrealized gain (loss) on investments 7.38 2.28 10.02 0.78 1.19 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 7.35 $ 2.25 $ 10.03 $ 0.87 $ 1.20 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net realized gain $ (0.62) $ (5.51) $ (3.49) $ (0.59) $ (3.07) ------------------------------------------------------------------------------------------------------------------------------------ Total distributions $ (0.62) $ (5.51) $ (3.49) $ (0.59) $ (3.07) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 6.73 $ (3.26) $ 6.54 $ 0.28 $ (1.87) ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 45.42 $ 38.69 $ 41.95 $ 35.41 $ 35.13 ==================================================================================================================================== Total return (c) 18.98% 5.45% 28.36%(d) 2.48% 3.25%(e)(f) Ratio of net expenses to average net assets 0.67% 0.66% 0.67% 0.68% 0.67%(g) Ratio of net investment income (loss) to average net assets (0.07)% (0.07)% 0.03% 0.27% 0.03%(g) Portfolio turnover rate 53% 82% 83% 99% 91% Net assets, end of period (in thousands) $160,785 $52,764 $24,180 $17,395 $11,973 ==================================================================================================================================== * The Fund was audited by an independent registered public accounting firm other than Ernst & Young LLP. (a) The per-share data presented above is based on the average shares outstanding for the period presented. (b) The amount shown for a share outstanding does not correspond with net investment loss on the Statement of Operations for the period due to timing of the sales and repurchase of shares. (c) Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period. (d) If the Fund had not recognized gains in the settlement of class action lawsuits during the year ended November 30, 2017, the total return would have been 28.34%. (e) Not annualized. (f) If the Fund had not recognized gains in the settlement of class action lawsuits during the year ended November 30, 2015, the total return would have been 3.23%. (g) Annualized. The accompanying notes are an integral part of these financial statements. 32 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 ------------------------------------------------------------------------------------------------------------------------------------ Year Year Year Year Year Ended Ended Ended Ended Ended 11/30/19 11/30/18 11/30/17 11/30/16* 11/30/15* ------------------------------------------------------------------------------------------------------------------------------------ Class R Net asset value, beginning of period $ 36.24 $ 39.93 $ 34.10 $ 34.11 $ 36.19 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) (a) $ (0.32) $ (0.37) $ (0.27) $ (0.16) $ (0.29) Net realized and unrealized gain (loss) on investments 6.89 2.19 9.59 0.74 1.28 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 6.57 $ 1.82 $ 9.32 $ 0.58 $ 0.99 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net realized gain $ (0.62) $ (5.51) $ (3.49) $ (0.59) $ (3.07) ------------------------------------------------------------------------------------------------------------------------------------ Total distributions $ (0.62) $ (5.51) $ (3.49) $ (0.59) $ (3.07) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 5.95 $ (3.69) $ 5.83 $ (0.01) $ (2.08) ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 42.19 $ 36.24 $ 39.93 $ 34.10 $ 34.11 ==================================================================================================================================== Total return (b) 18.12% 4.65% 27.37% 1.70% 2.75%(c) Ratio of net expenses to average net assets 1.40% 1.44% 1.45% 1.43% 1.45% Ratio of net investment income (loss) to average net assets (0.82)% (0.88)% (0.72)% (0.49)% (0.77)% Portfolio turnover rate 53% 82% 83% 99% 91% Net assets, end of period (in thousands) $17,484 $19,341 $37,092 $37,351 $25,973 ==================================================================================================================================== * The Fund was audited by an independent registered public accounting firm other than Ernst & Young LLP. (a) The per-share data presented above is based on the average shares outstanding for the period presented. (b) Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period. (c) If the Fund had not recognized gains in the settlement of class action lawsuits during the year ended November 30, 2015, the total return would have been 2.72%. The accompanying notes are an integral part of these financial statements. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 33 Financial Highlights (continued) ------------------------------------------------------------------------------------------------------------------------------------ Year Year Year Year Year Ended Ended Ended Ended Ended 11/30/19 11/30/18 11/30/17 11/30/16* 11/30/15* ------------------------------------------------------------------------------------------------------------------------------------ Class Y Net asset value, beginning of period $ 41.57 $ 44.72 $ 37.62 $ 37.34 $ 39.08 ------------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) (a) $ (0.09) $ (0.10) $ (0.03) $ 0.05(b) $ (0.04) Net realized and unrealized gain (loss) on investments 7.92 2.46 10.62 0.82 1.37 ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 7.83 $ 2.36 $ 10.59 $ 0.87 $ 1.33 ------------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net realized gain $ (0.62) $ (5.51) $ (3.49) $ (0.59) $ (3.07) ------------------------------------------------------------------------------------------------------------------------------------ Total distributions $ (0.62) $ (5.51) $ (3.49) $ (0.59) $ (3.07) ------------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 7.21 $ (3.15) $ 7.10 $ 0.28 $ (1.74) ------------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 48.78 $ 41.57 $ 44.72 $ 37.62 $ 37.34 ==================================================================================================================================== Total return (c) 18.82% 5.36%(d) 28.18% 2.33%(e) 3.42%(f) Ratio of net expenses to average net assets 0.79% 0.78% 0.79% 0.82% 0.77% Ratio of net investment income (loss) to average net assets (0.21)% (0.20)% (0.07)% 0.12% (0.09)% Portfolio turnover rate 53% 82% 83% 99% 91% Net assets, end of period (in thousands) $682,344 $532,690 $330,810 $220,496 $206,479 ==================================================================================================================================== * The Fund was audited by an independent registered public accounting firm other than Ernst & Young LLP. (a) The per-share data presented above is based on the average shares outstanding for the period presented. (b) The amount shown for a share outstanding does not correspond with net investment loss on the Statement of Operations for the period due to timing of the sales and repurchase of shares. (c) Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period. (d) If the Fund had not recognized gains in the settlement of class action lawsuits during the year ended November 30, 2018, the total return would have been 5.34%. (e) If the Fund had not recognized gains in the settlement of class action lawsuits during the year ended November 30, 2016, the total return would have been 2.31%. (f) If the Fund had not recognized gains in the settlement of class action lawsuits during the year ended November 30, 2015, the total return would have been 3.39%. The accompanying notes are an integral part of these financial statements. 34 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 Notes to Financial Statements | 11/30/19 1. Organization and Significant Accounting Policies Pioneer Select Mid Cap Growth Fund (the "Fund") is one of two portfolios comprising Pioneer Series Trust II (the "Trust"), a Delaware statutory trust. The Fund is registered under the Investment Company Act of 1940 as a diversified, open-end management investment company. The investment objective of the Fund is long-term capital growth. The Fund offers five classes of shares designated as Class A, Class C, Class K, Class R 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 Trust gives the Board of Trustees the flexibility to specify either per-share voting or dollar-weighted voting when submitting matters for shareowner approval. Under per-share voting, each share of a class of the Fund is entitled to one vote. Under dollar-weighted voting, a shareowner's voting power is determined not by the number of shares owned, but by the dollar value of the shares on the record date. Each share class has exclusive voting rights with respect to matters affecting only that class, including with respect to the distribution plan for that class. There is no distribution plan for Class K or Class Y shares. Amundi Pioneer Asset Management, Inc., an indirect, wholly owned subsidiary of Amundi and Amundi's wholly owned subsidiary, Amundi USA, Inc., serves as the Fund's investment adviser (the "Adviser"). Amundi Pioneer Distributor, Inc., an affiliate of Amundi Pioneer Asset Management, Inc., serves as the Fund's distributor (the "Distributor"). In August 2018, the Securities and Exchange Commission ("SEC") released a Disclosure Update and Simplification Final Rule. The Final Rule amends Regulation S-X disclosures requirements to conform them to U.S. Generally Accepted Accounting Principles ("U.S. GAAP") for investment companies. The Fund's financial statements were prepared in compliance with the new amendments to Regulation S-X. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 35 The Fund is an investment company and follows investment company accounting and reporting guidance under U.S. GAAP. U.S. GAAP requires the management of the Fund to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of income, expenses and gain or loss on investments during the reporting period. Actual results could differ from those estimates. The following is a summary of significant accounting policies followed by the Fund in the preparation of its financial statements: A. Security Valuation The net asset value of the Fund is computed once daily, on each day the New York Stock Exchange ("NYSE") is open, as of the close of regular trading on the NYSE. Equity securities that have traded on an exchange are valued by using the last sale price on the principal exchange where they are traded. Equity securities that have not traded on the date of valuation, or securities for which sale prices are not available, generally are valued using the mean between the last bid and asked prices or, if both last bid and asked prices are not available, at the last quoted bid price. Last sale and bid and asked prices are provided by independent third party pricing services. In the case of equity securities not traded on an exchange, prices are typically determined by independent third party pricing services using a variety of techniques and methods. The value of foreign securities is translated into U.S. dollars based on foreign currency exchange rate quotations supplied by a third party pricing source. Trading in non-U.S. equity securities is substantially completed each day at various times prior to the close of the NYSE. The values of such securities used in computing the net asset value of the Fund's shares are determined as of such times. The Fund may use a fair value model developed by an independent pricing service to value non-U.S. equity securities. Fixed-income securities are valued by using prices supplied by independent pricing services, which consider such factors as market prices, market events, quotations from one or more brokers, Treasury spreads, yields, maturities and ratings, or may use a pricing matrix or other fair value methods or techniques to provide an estimated value of the security or instrument. A pricing matrix is a means of valuing a debt security on the basis of current market prices for other debt securities, historical trading patterns in the market for fixed-income securities and/or other factors. Non-U.S. debt securities that are listed on an exchange will be valued at the bid price obtained from an independent third 36 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 party pricing service. When independent third party pricing services are unable to supply prices, or when prices or market quotations are considered to be unreliable, the value of that security may be determined using quotations from one or more broker-dealers. Securities for which independent pricing services or broker-dealers are unable to supply prices or for which market prices and/or quotations are not readily available or are considered to be unreliable are valued by a fair valuation team comprised of certain personnel of the Adviser pursuant to procedures adopted by the Fund's Board of Trustees. The Adviser's fair valuation team uses fair value methods approved by the Valuation Committee of the Board of Trustees. The Adviser's fair valuation team is responsible for monitoring developments that may impact fair valued securities and for discussing and assessing fair values on an ongoing basis, and at least quarterly, with the Valuation Committee of the Board of Trustees. Inputs used when applying fair value methods to value a security may include credit ratings, the financial condition of the company, current market conditions and comparable securities. The Fund may use fair value methods if it is determined that a significant event has occurred after the close of the exchange or market on which the security trades and prior to the determination of the Fund's net asset value. Examples of a significant event might include political or economic news, corporate restructurings, natural disasters, terrorist activity or trading halts. Thus, the valuation of the Fund's securities may differ significantly from exchange prices, and such differences could be material. At November 30, 2019, no securities were valued using fair value methods (other than securities valued using prices supplied by independent pricing services, broker-dealers or using a third party insurance industry pricing model). B. Investment Income and Transactions Dividend income is recorded on the ex-dividend date, except that certain dividends from foreign securities where the ex-dividend date may have passed are recorded as soon as the Fund becomes aware of the ex-dividend data in the exercise of reasonable diligence. Interest income, including interest on income-bearing cash accounts, is recorded on the accrual basis. Dividend and interest income are reported net of unrecoverable foreign taxes withheld at the applicable country rates and net of income accrued on defaulted securities. Interest and dividend income payable by delivery of additional shares is reclassified as PIK (payment-in-kind) income upon receipt and is included in interest and dividend income, respectively. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 37 Security transactions are recorded as of trade date. Gains and losses on sales of investments are calculated on the identified cost method for both financial reporting and federal income tax purposes. C. Foreign Currency Translation The books and records of the Fund are maintained in U.S. dollars. Amounts denominated in foreign currencies are translated into U.S. dollars using current exchange rates. Net realized gains and losses on foreign currency transactions, if any, represent, among other things, the net realized gains and losses on foreign currency exchange contracts, disposition of foreign currencies and the difference between the amount of income accrued and the U.S. dollars actually received. Further, the effects of changes in foreign currency exchange rates on investments are not segregated on the Statement of Operations from the effects of changes in the market prices of those securities, but are included with the net realized and unrealized gain or loss on investments. D. Federal Income Taxes It is the Fund's policy to comply with the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute all of its net taxable income and net realized capital gains, if any, to its shareowners. Therefore, no provision for federal income taxes is required. As of November 30, 2019, the Fund did not accrue any interest or penalties with respect to uncertain tax positions, which, if applicable, would be recorded as an income tax expense on the Statement of Operations. Tax returns filed within the prior three years remain subject to examination by federal and state tax authorities. The amount and character of income and capital gain distributions to shareowners are determined in accordance with federal income tax rules, which may differ from U.S. GAAP. Distributions in excess of net investment income or net realized gains are temporary over distributions for financial statement purposes resulting from differences in the recognition or classification of income or distributions for financial statement and tax purposes. Capital accounts within the financial statements are adjusted for permanent book/tax differences to reflect tax character, but are not adjusted for temporary differences. At November 30, 2019, the Fund reclassified $7,291,032 to increase distributable earnings and $7,291,032 to decrease paid-in capital to reflect permanent book/tax differences. These adjustments have no impact on net assets or the results of operations. 38 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 The tax character of distributions paid during the years ended November 30, 2019 and November 30, 2018, were as follows: -------------------------------------------------------------------------- 2019 2018 -------------------------------------------------------------------------- Distributions paid from: Long-term capital gain $28,913,887 $222,482,216 -------------------------------------------------------------------------- Total $28,913,887 $222,482,216 ========================================================================== The following shows the components of distributable earnings on a federal income tax basis at November 30, 2019: -------------------------------------------------------------------------- 2019 -------------------------------------------------------------------------- Distributable earnings: Undistributed long-term gain $ 13,106,592 Net unrealized appreciation 608,713,905 -------------------------------------------------------------------------- Total $621,820,497 ========================================================================== The difference between book-basis and tax-basis unrealized appreciation is attributable to the tax deferral of losses on wash sales and tax basis adjustments on Real Estate Investment Trust (REIT) holdings. E. Fund Shares The Fund records sales and repurchases of its shares as of trade date. The Distributor earned $57,975 in underwriting commissions on the sale of Class A shares during the year ended November 30, 2019. F. Class Allocations Income, common expenses and realized and unrealized gains and losses are calculated at the Fund level and allocated daily to each class of shares based on its respective percentage of adjusted net assets at the beginning of the day. Distribution fees are calculated based on the average daily net asset value attributable to Class A, Class C and Class R shares of the Fund, respectively (see Note 4). Class K and Class Y shares do not pay distribution fees. All expenses and fees paid to the Fund's transfer agent for its services are allocated among the classes of shares based on the number of accounts in each class and the ratable allocation of related out-of-pocket expenses (see Note 3). Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 39 Distributions to shareowners are recorded as of the ex-dividend date. Distributions paid by the Fund with respect to each class of shares are calculated in the same manner and at the same time, except that net investment income dividends to Class A, Class C, Class K, Class R and Class Y shares can reflect different transfer agent and distribution expense rates. G. Risks The value of securities held by the Fund may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic, political or regulatory conditions, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. In the past several years, financial markets have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. These conditions may continue, recur, worsen or spread. A general rise in interest rates could adversely affect the price and liquidity of fixed-income securities and could also result in increased redemptions from the Fund. At times, the Fund's investments may represent industries or industry sectors that are interrelated or have common risks, making the Fund more susceptible to any economic, political, or regulatory developments or other risks affecting those industries and sectors. The Fund's investments in foreign markets and countries with limited developing markets may subject the Fund to a greater degree of risk than investments in a developed market. These risks include disruptive political or economic conditions and the imposition of adverse governmental laws or currency exchange restrictions. With the increased use of technologies such as the Internet to conduct business, the Fund is susceptible to operational, information security and related risks. While the Fund's Adviser has established business continuity plans in the event of, and risk management systems to prevent, limit or mitigate, such cyber-attacks, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund such as Brown Brothers Harriman & Co., the Fund's custodian and accounting agent, and DST Asset Manager Solutions, Inc., the Fund's transfer agent. In addition, many beneficial owners of Fund shares hold them through accounts at broker-dealers, retirement platforms and other financial market participants over which neither the Fund nor Amundi Pioneer exercises control. Each of these may in turn rely on service providers to them, which are also subject to the risk of cyber-attacks. Cybersecurity failures or breaches at Amundi Pioneer or 40 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 the Fund's service providers or intermediaries have the ability to cause disruptions and impact business operations, potentially resulting in financial losses, interference with the Fund's ability to calculate its net asset value, impediments to trading, the inability of Fund shareowners to effect share purchases, redemptions or exchanges or receive distributions, loss of or unauthorized access to private shareowner information and violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, or additional compliance costs. Such costs and losses may not be covered under any insurance. In addition, maintaining vigilance against cyber-attacks may involve substantial costs over time, and system enhancements may themselves be subject to cyber-attacks. The Fund's prospectus contains unaudited information regarding the Fund's principal risks. Please refer to that document when considering the Fund's principal risks. 2. Management Agreement The Adviser manages the Fund's portfolio. Management fees are calculated daily at the annual rate of 0.625% of the Fund's average daily net assets up to $500 million, 0.60% of the next $500 million of the Fund's average daily net assets, 0.575% of the next $4 billion of the Fund's average daily net assets and 0.55% of the Fund's average daily net assets average daily net assets over $5 billion. Prior to October 1, 2018, Management fees were calculated daily at the annual rate of 0.625% of the Fund's average daily net assets up to $500 million, 0.60% of the next $500 million of the Fund's average daily net assets and 0.575% of the Fund's average daily net assets average daily net assets over $1 billion. For the year ended November 30, 2019, the effective management fee was equivalent to 0.59% 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 $284,736 in management fees, administrative costs and certain other reimbursements payable to the Adviser at November 30, 2019. 3. Transfer Agent DST Asset Manager Solutions, Inc. serves as the transfer agent to the Fund at negotiated rates. Transfer agent fees and payables shown on the Statement of Operations and the Statement of Assets and Liabilities, respectively, include sub-transfer agent expenses incurred through the Fund's omnibus relationship contracts. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 41 In addition, the Fund reimbursed the transfer agent for out-of-pocket expenses incurred by the transfer agent related to shareowner communications activities such as proxy and statement mailings, and outgoing phone calls. For the year ended November 30, 2019, such out-of-pocket expenses by class of shares were as follows: -------------------------------------------------------------------------------- Shareowner Communications: -------------------------------------------------------------------------------- Class A $263,298 Class C 14,698 Class K 2,447 Class R 6,842 Class Y 24,274 -------------------------------------------------------------------------------- Total $311,559 ================================================================================ 4. Distribution and Service Plans The Fund has adopted a distribution plan (the "Plan") pursuant to Rule 12b-1 of the Investment Company Act of 1940 with respect to its Class A, Class C and Class R shares. Pursuant to the Plan, the Fund pays the Distributor 0.25% of the average daily net assets attributable to Class A shares as compensation for personal services and/or account maintenance services or distribution services with regard to Class A shares. Pursuant to the Plan, the Fund also pays the Distributor 1.00% of the average daily net assets attributable to Class C shares. The fee for Class C shares consists of a 0.25% service fee and a 0.75% distribution fee paid as compensation for personal services and/or account maintenance services or distribution services with regard to Class C shares. Pursuant to the Plan, the Fund further pays the Distributor 0.50% of the average daily net assets attributable to Class R shares for distribution services. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities is $81,254 in distribution fees payable to the Distributor at November 30, 2019. The Fund also has adopted a separate service plan for Class R shares (the "Service Plan"). The Service Plan authorizes the Fund to pay securities dealers, plan administrators or other service organizations that agree to provide certain services to retirement plans or plan participants holding shares of the Fund a service fee of up to 0.25% of the Fund's average daily net assets attributable to Class R shares held by such plans. In addition, redemptions of Class A and Class C 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 42 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 cost or market value of shares being redeemed. Shares purchased as part of an exchange remain subject to any CDSC that applied to the original purchase of those shares. There is no CDSC for Class K, Class R and Class Y shares. Proceeds from the CDSCs are paid to the Distributor. For the year ended November 30, 2019, CDSCs in the amount of $4,675 were paid to the Distributor. 5. Line of Credit Facility The Fund, along with certain other funds in the Pioneer Family of Funds (the "Funds"), participates in a committed, unsecured revolving line of credit facility. Borrowings are used solely for temporary or emergency purposes. The Fund may borrow up to the lesser of the amount available under the credit facility or the limits set for borrowing by the Fund's prospectus and the 1940 Act. Effective August 1, 2018, the Fund participates in a credit facility in the amount of $250 million. Under such facility, depending on the type of loan, interest on borrowings is payable at the London Interbank Offered Rate ("LIBOR") plus a credit spread. The Fund also pays an annual commitment fee to participate in a credit facility. The commitment fee is allocated among participating Funds based on an allocation schedule set forth in the credit agreement. For the year ended November 30, 2019, the Fund had no borrowings under the credit facility. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 43 Report of Independent Registered Public Accounting Firm To the Board of Trustees of Pioneer Series Trust II and the Shareholders of Pioneer Select Mid Cap Growth Fund: -------------------------------------------------------------------------------- Opinion on the Financial Statements We have audited the accompanying statement of assets and liabilities of Pioneer Select Mid Cap Growth Fund (the "Fund") (one of the funds constituting Pioneer Series Trust II (the "Trust")), including the schedule of investments, as of November 30, 2019, and the related statement of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, the financial highlights for each of the three years in the period then ended and the related notes (collectively referred to as the "financial statements"). The financial highlights for the periods ended November 30, 2015 and November 30, 2016 were audited by another independent registered public accounting firm whose report, dated January 25, 2017, expressed an unqualified opinion on those financial highlights. In our opinion, the financial statements present fairly, in all material respects, the financial position of the Fund (one of the funds constituting Pioneer Series Trust II) at November 30, 2019, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended, and its financial highlights for each of the three years in the period then ended, in conformity with U.S. generally accepted accounting principles. Basis for Opinion These financial statements are the responsibility of the Trust's management. Our responsibility is to express an opinion on the Fund's financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) ("PCAOB") and are required to be independent with respect to the Fund in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB. We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Trust is not required to have, nor were we engaged to perform, an audit of the Trust's internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting, but not for the purpose of expressing an opinion on the effectiveness of the Trust's internal control over financial reporting. Accordingly, we express no such opinion. 44 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our procedures included confirmation of securities owned as of November 30, 2019, by correspondence with the custodian and brokers. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion. /s/ Ernst & Young LLP We have served as the Fund's auditor since 2017. Boston, Massachusetts January 29, 2020 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 45 Approval of Investment Management Agreement Amundi Pioneer Asset Management, Inc. ("APAM") serves as the investment adviser to Pioneer Select Mid Cap Growth Fund (the "Fund") pursuant to an investment management agreement between APAM and the Fund. In order for APAM to remain the investment adviser of the Fund, the Trustees of the Fund must determine annually whether to renew the investment management agreement for the Fund. The contract review process began in January 2019 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 2019, July 2019 and September 2019. In addition, the Trustees reviewed and discussed the Fund's performance at regularly scheduled meetings throughout the year, and took into account other information related to the Fund provided to the Trustees at regularly scheduled meetings, in connection with the review of the Fund's investment management agreement. In March 2019, the Trustees, among other things, discussed the memorandum provided by Fund counsel that summarized the legal standards and other considerations that are relevant to the Trustees in their deliberations regarding the renewal of the investment management agreement, and reviewed and discussed the qualifications of the investment management teams for the Fund, as well as the level of investment by the Fund's portfolio managers in the Fund. In July 2019, the Trustees, among other things, reviewed the Fund's management fees and total expense ratios, the financial statements of APAM and its parent companies, profitability analyses provided by APAM, and analyses from APAM as to possible economies of scale. The Trustees also reviewed the profitability of the institutional business of APAM and APAM's affiliate, Amundi Pioneer Institutional Asset Management, Inc. ("APIAM" and, together with APAM, "Amundi Pioneer"), as compared to that of APAM's fund management business, and considered the differences between the fees and expenses of the Fund and the fees and expenses of APAM's and APIAM's institutional accounts, as well as the different services provided by APAM to the Fund and by APAM and APIAM to the institutional accounts. The Trustees further considered contract review materials, including additional materials received in response to the Trustees' request, in September 2019. At a meeting held on September 17, 2019, based on their evaluation of the information provided by APAM and third parties, the Trustees of the Fund, including the Independent Trustees voting separately, unanimously approved the renewal of the investment management agreement for another year. In approving the renewal of the investment management agreement, the Trustees 46 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the renewal of the agreement. Nature, Extent and Quality of Services The Trustees considered the nature, extent and quality of the services that had been provided by APAM to the Fund, taking into account the investment objective and strategy of the Fund. The Trustees also reviewed APAM's investment approach for the Fund and its research process. The Trustees considered the resources of APAM and the personnel of APAM who provide investment management services to the Fund. They also reviewed the amount of non-Fund assets managed by the portfolio managers of the Fund. They considered the non-investment resources and personnel of APAM that are involved in APAM's services to the Fund, including APAM's compliance, risk management, and legal resources and personnel. The Trustees noted the substantial attention and high priority given by APAM's senior management to the Pioneer Fund complex. The Trustees considered that APAM supervises and monitors the performance of the Fund's service providers and provides the Fund with personnel (including Fund officers) and other resources that are necessary for the Fund's business management and operations. The Trustees also considered that, as administrator, APAM is responsible for the administration of the Fund's business and other affairs. The Trustees considered the fees paid to APAM for the provision of administration services. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that had been provided by APAM to the Fund were satisfactory and consistent with the terms of the investment management agreement. Performance of the Fund In considering the Fund's performance, the Trustees regularly review and discuss throughout the year data prepared by APAM and information comparing the Fund's performance with the performance of its peer group of funds, as classified by Morningstar, Inc. (Morningstar), and the performance of the Fund's benchmark index. They also discuss the Fund's performance with APAM on a regular basis. The Trustees' regular reviews and discussions were factored into the Trustees' deliberations concerning the renewal of the investment management agreement. Management Fee and Expenses The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees of its peer group of funds as classified by Morningstar and also to the expense ratios of a peer group of Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 47 funds selected on the basis of criteria determined by the Independent Trustees for this purpose using data provided by Strategic Insight Mutual Fund Research and Consulting, LLC (Strategic Insight), an independent third party. The peer group comparisons referred to below are organized in quintiles. Each quintile represents one-fifth of the peer group. In all peer group comparisons referred to below, first quintile is most favorable to the Fund's shareowners. The Trustees noted that they separately review and consider the impact of the Fund's transfer agency and Fund- and APAM-paid expenses for sub-transfer agency and intermediary arrangements, and that the results of the most recent such review were considered in the consideration of the Fund's expense ratio. The Trustees considered that the Fund's management fee for the most recent fiscal year was in the first quintile relative to the management fees paid by other funds in its Morningstar category for the comparable period. The Trustees also considered the breakpoints in the management fee schedule and the reduced fee rates above certain asset levels. The Trustees considered that the expense ratio of the Fund's Class A shares for the most recent fiscal year was in the first quintile relative to its Strategic Insight peer group for the comparable period. The Trustees reviewed management fees charged by APAM and APIAM to institutional and other clients, including publicly offered European funds sponsored by APAM's affiliates, unaffiliated U.S. registered investment companies (in a sub-advisory capacity), and unaffiliated foreign and domestic separate accounts. The Trustees also considered APAM's costs in providing services to the Fund and APAM's and APIAM's costs in providing services to the other clients and considered the differences in management fees and profit margins for fund and non-fund services. In evaluating the fees associated with APAM's and APIAM's client accounts, the Trustees took into account the respective demands, resources and complexity associated with the Fund and other client accounts. The Trustees noted that, in some instances, the fee rates for those clients were lower than the management fee for the Fund and considered that, under the investment management agreement with the Fund, APAM performs additional services for the Fund that it does not provide to those other clients or services that are broader in scope, including oversight of the Fund's other service providers and activities related to compliance and the extensive regulatory and tax regimes to which the Fund is subject. The Trustees also considered the entrepreneurial risks associated with APAM's management of the Fund. The Trustees concluded that the management fee payable by the Fund to APAM was reasonable in relation to the nature and quality of the services provided by APAM. 48 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 Profitability The Trustees considered information provided by APAM regarding the profitability of APAM with respect to the advisory services provided by APAM to the Fund, including the methodology used by APAM in allocating certain of its costs to the management of the Fund. The Trustees also considered APAM's profit margin in connection with the overall operation of the Fund. They further reviewed the financial results, including the profit margins, realized by APAM and APIAM from non-fund businesses. The Trustees considered APAM's profit margins in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees concluded that APAM's profitability with respect to the management of the Fund was not unreasonable. Economies of Scale The Trustees considered APAM's views relating to economies of scale in connection with the Pioneer Funds as fund assets grow and the extent to which any such economies of scale are shared with the Fund and Fund shareholders. The Trustees noted the breakpoints in the management fee schedule. The Trustees recognize that economies of scale are difficult to identify and quantify, and that, among other factors that may be relevant, are the following: fee levels, expense subsidization, investment by APAM in research and analytical capabilities and APAM's commitment and resource allocation to the Fund. The Trustees noted that profitability also may be an indicator of the availability of any economies of scale, although profitability may vary for other reasons including due to reductions in expenses. The Trustees concluded that economies of scale, if any, were being appropriately shared with the Fund. Other Benefits The Trustees considered the other benefits that APAM enjoys from its relationship with the Fund. The Trustees considered the character and amount of fees paid or to be paid by the Fund, other than under the investment management agreement, for services provided by APAM and its affiliates. The Trustees further considered the revenues and profitability of APAM's businesses other than the Fund business. To the extent applicable, the Trustees also considered the benefits to the Fund and to APAM and its affiliates from the use of "soft" commission dollars generated by the Fund to pay for research and brokerage services. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 49 The Trustees considered that Amundi Pioneer is the principal U.S. asset management business of Amundi, which is one of the largest asset managers globally. Amundi's worldwide asset management business manages over $1.6 trillion in assets (including the Pioneer Funds). The Trustees considered that APAM's relationship with Amundi creates potential opportunities for APAM, APIAM and Amundi that derive from APAM's relationships with the Fund, including Amundi's ability to market the services of APAM globally. The Trustees noted that APAM has access to additional research and portfolio management capabilities as a result of its relationship with Amundi and Amundi's enhanced global presence that may contribute to an increase in the resources available to APAM. The Trustees considered that APAM and the Fund receive reciprocal intangible benefits from the relationship, including mutual brand recognition and, for the Fund, direct and indirect access to the resources of a large global asset manager. The Trustees concluded that any such benefits received by APAM as a result of its relationship with the Fund were reasonable. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including the Independent Trustees, concluded that the investment management agreement for the Fund, including the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of the investment management agreement. 50 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 Trustees, Officers and Service Providers Investment Adviser and Administrator Amundi Pioneer Asset Management, Inc. Custodian and Sub-Administrator Brown Brothers Harriman & Co. Independent Registered Public Accounting Firm Ernst & Young LLP Principal Underwriter Amundi Pioneer Distributor, Inc. Legal Counsel Morgan, Lewis & Bockius LLP Transfer Agent DST Asset Manager Solutions, Inc. Proxy Voting Policies and Procedures of the Fund are available without charge, upon request, by calling our toll free number (1-800-225-6292). Information regarding how the Fund voted proxies relating to portfolio securities during the most recent 12-month period ended June 30 is publicly available to shareowners at www.amundipioneer.com/us. This information is also available on the Securities and Exchange Commission's web site at www.sec.gov. Trustees and Officers The Fund's Trustees and officers are listed below, together with their principal occupations and other directorships they have held during at least the past five years. Trustees who are interested persons of the Fund within the meaning of the 1940 Act are referred to as Interested Trustees. Trustees who are not interested persons of the Fund are referred to as Independent Trustees. Each of the Trustees serves as a Trustee of each of the 45 U.S. registered investment portfolios for which Amundi Pioneer serves as investment adviser (the "Pioneer Funds"). The address for all Trustees and all officers of the Fund is 60 State Street, Boston, Massachusetts 02109. The Statement of Additional Information of the Fund includes additional information about the Trustees and is available, without charge, upon request, by calling 1-800-225-6292. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 51 Independent Trustees Name, Age and Position Term of Office and Other Directorships Held With the Fund Length of Service Principal Occupation Held by Trustee ------------------------------------------------------------------------------------------------------------------------------------ Thomas J. Perna (68) Trustee since 2006. Private investor (2004 - 2008 and Director, Broadridge Financial Chairman of the Board Serves until a successor 2013 - present); Chairman (2008 - Solutions, Inc. (investor and Trustee trustee is elected 2013) and Chief Executive Officer communications and securities or earlier retirement (2008 - 2012), Quadriserv, Inc. processing provider for financial or removal. (technology products for securities services industry) (2009 - present); lending industry); and Senior Director, Quadriserv, Inc. (2005 - Executive Vice President, The Bank 2013); and Commissioner, New Jersey of New York (financial and State Civil Service Commission securities services) (1986 - 2004) (2011 - 2015) ------------------------------------------------------------------------------------------------------------------------------------ John E. Baumgardner, Trustee since 2019. Of Counsel (2019 - present), Partner Chairman, The Lakeville Journal Jr. (68) Serves until a successor (1983-2018), Sullivan & Cromwell LLP Company, LLC, (privately-held Trustee trustee is elected (law firm). community newspaper group) or earlier retirement (2015-present) or removal. ------------------------------------------------------------------------------------------------------------------------------------ Diane Durnin (62) Trustee since 2019. Managing Director - Head of Product None Trustee Serves until a successor Strategy and Development, BNY Mellon trustee is elected Investment Management (2012-2018); or earlier retirement Vice Chairman - The Dreyfus Corporation or removal. (2005 - 2018): Executive Vice President Head of Product, BNY Mellon Investment Management (2007-2012); Executive Director- Product Strategy, Mellon Asset Management (2005-2007); Executive Vice President Head of Products, Marketing and Client Service, Dreyfus Corporation (2000-2005); and Senior Vice President Strategic Product and Business Development, Dreyfus Corporation (1994-2000) ------------------------------------------------------------------------------------------------------------------------------------ 52 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 Name, Age and Position Term of Office and Other Directorships Held With the Fund Length of Service Principal Occupation Held by Trustee ------------------------------------------------------------------------------------------------------------------------------------ Benjamin M. Friedman (75) Trustee since 2008. William Joseph Maier Professor of Trustee, Mellon Institutional Funds Trustee Serves until a successor Political Economy, Harvard University Investment Trust and Mellon trustee is elected (1972 - present) Institutional Funds Master Portfolio or earlier retirement (oversaw 17 portfolios in fund or removal. complex) (1989 - 2008) ------------------------------------------------------------------------------------------------------------------------------------ Lorraine H. Monchak (62) Trustee since 2017. Chief Investment Officer, 1199 SEIU None Trustee (Advisory Trustee from Funds (healthcare workers union pension 2014 - 2017). funds) (2001 - present); Vice Serves until asuccessor President - International Investments trustee is elected Group, American International Group, or earlier retirement Inc. (insurance company) (1993 - 2001); or removal. Vice President - Corporate Finance and Treasury Group, Citibank, N.A. (1980 - 1986 and 1990 - 1993); Vice President - Asset/Liability Management Group, Federal Farm Funding Corporation (government-sponsored issuer of debt securities) (1988 - 1990); Mortgage Strategies Group, Shearson Lehman Hutton, Inc. (investment bank) (1987 - 1988); and Mortgage Strategies Group, Drexel Burnham Lambert, Ltd. (investment bank) (1986 - 1987) ------------------------------------------------------------------------------------------------------------------------------------ Marguerite A. Piret (71) Trustee since 2004. President and Chief Executive Officer, Director of New America High Income Trustee Serves until a successor Metric Financial Inc. (formerly known Fund, Inc. (closed-end investment trustee is elected as Newbury Piret Company) (investment company) (2004 - present); and or earlier retirement banking firm) (1981 - present) Member, Board of Governors, or removal. Investment Company Institute (2000 - 2006) ------------------------------------------------------------------------------------------------------------------------------------ Fred J. Ricciardi (72) Trustee since 2014. Consultant (investment company None Trustee Serves until a successor services) (2012 - present); Executive trustee is elected Vice President, BNY Mellon (financial or earlier retirement and investment company services) or removal. (1969 - 2012); Director, BNY International Financing Corp. (financial services) (2002 - 2012); Director, Mellon Overseas Investment Corp. (financial services) (2009 - 2012); Director, Financial Models (technology) (2005-2007); Director, BNY Hamilton Funds, Ireland (offshore investment companies) (2004-2007); Chairman/Director, AIB/BNY Securities Services, Ltd., Ireland (financial services) (1999-2006); and Chairman, BNY Alternative Investment Services, Inc. (financial services) (2005-2007) ------------------------------------------------------------------------------------------------------------------------------------ Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 53 Interested Trustees Name, Age and Position Term of Office and Other Directorships Held With the Fund Length of Service Principal Occupation Held by Trustee ------------------------------------------------------------------------------------------------------------------------------------ Lisa M. Jones (57)* Trustee since 2017. Director, CEO and President of Amundi None Trustee, President and Serves until a successor Pioneer Asset Management USA, Inc. Chief Executive Officer trustee is elected (since September 2014); Director, CEO or earlier retirement and President of Amundi Pioneer Asset or removal Management, Inc. (since September 2014); Director, CEO and President of Amundi Pioneer Distributor, Inc. (since September 2014); Director, CEO and President of Amundi Pioneer Institutional Asset Management, Inc. (since September 2014); Chair, Amundi Pioneer Asset Management USA, Inc., Amundi Pioneer Distributor, Inc. and Amundi Pioneer Institutional Asset Management, Inc. (September 2014 - 2018); Managing Director, Morgan Stanley Investment Management (2010 - 2013); Director of Institutional Business, CEO of International, Eaton Vance Management (2005 - 2010); and Director of Amundi USA, Inc. (since 2017) ------------------------------------------------------------------------------------------------------------------------------------ Kenneth J. Taubes (61)* Trustee since 2014. Director and Executive Vice President None Trustee Serves until a successor (since 2008) and Chief Investment trustee is elected Officer, U.S. (since 2010) of Amundi or earlier retirement Pioneer Asset Management USA, Inc.; or removal Director and Executive Vice President and Chief Investment Officer, U.S. of Amundi Pioneer (since 2008); Executive Vice President and Chief Investment Officer, U.S. of Amundi Pioneer Institutional Asset Management, Inc. (since 2009); Portfolio Manager of Amundi Pioneer (since 1999); and Director of Amundi USA, Inc. (since 2017) ------------------------------------------------------------------------------------------------------------------------------------ * Ms. Jones and Mr. Taubes are Interested Trustees because they are officers or directors of the Fund's investment adviser and certain of its affiliates. 54 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 Fund Officers Name, Age and Position Term of Office and Other Directorships Held With the Fund Length of Service Principal Occupation Held by Officer ------------------------------------------------------------------------------------------------------------------------------------ Christopher J. Kelley (54) Since 2004. Serves at Vice President and Associate General None Secretary and Chief the discretion of Counsel of Amundi Pioneer since January Legal Officer the Board 2008; Secretary and Chief Legal Officer of all of the Pioneer Funds since June 2010; Assistant Secretary of all of the Pioneer Funds from September 2003 to May 2010; and Vice President and Senior Counsel of Amundi Pioneer from July 2002 to December 2007 ------------------------------------------------------------------------------------------------------------------------------------ Carol B. Hannigan (58) Since 2010. Serves at Fund Governance Director of Amundi None Assistant Secretary the discretion of Pioneer since December 2006 and the Board Assistant Secretary of all the Pioneer Funds since June 2010; Manager - Fund Governance of Amundi Pioneer from December 2003 to November 2006; and Senior Paralegal of Amundi Pioneer from January 2000 to November 2003 ------------------------------------------------------------------------------------------------------------------------------------ Thomas Reyes (57) Since 2010. Serves at Senior Counsel of Amundi Pioneer since None Assistant Secretary the discretion of May 2013 and Assistant Secretary of all the Board the Pioneer Funds since June 2010; and Counsel of Amundi Pioneer from June 2007 to May 2013 ------------------------------------------------------------------------------------------------------------------------------------ Mark E. Bradley (60) Since 2008. Serves at Vice President - Fund Treasury of None Treasurer and the discretion of Amundi Pioneer; Treasurer of all of the Chief Financial the Board Pioneer Funds since March 2008; Deputy and Accounting Officer Treasurer of Amundi Pioneer from March 2004 to February 2008; and Assistant Treasurer of all of the Pioneer Funds from March 2004 to February 2008 ------------------------------------------------------------------------------------------------------------------------------------ Luis I. Presutti (54) Since 2004. Serves at Director - Fund Treasury of Amundi None Assistant Treasurer the discretion of Pioneer; and Assistant Treasurer of the Board all of the Pioneer Funds ------------------------------------------------------------------------------------------------------------------------------------ Gary Sullivan (61) Since 2004. Serves at Senior Manager - Fund Treasury of None Assistant Treasurer the discretion of Amundi Pioneer; and Assistant the Board Treasurer of all of the Pioneer Funds ------------------------------------------------------------------------------------------------------------------------------------ Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 55 Fund Officers (continued) Name, Age and Position Term of Office and Other Directorships Held With the Fund Length of Service Principal Occupation Held by Officer ------------------------------------------------------------------------------------------------------------------------------------ John Malone (48) Since 2018. Serves at Managing Director, Chief Compliance None Chief Compliance Officer the discretion of Officer of Amundi Pioneer Asset the Board Management; Amundi Pioneer Institutional Asset Management, Inc.; and the Pioneer Funds since September 2018; and Chief Compliance Officer of Amundi Pioneer Distributor, Inc. since January 2014. ------------------------------------------------------------------------------------------------------------------------------------ Kelly O'Donnell (48) Since 2006. Serves at Vice President - Amundi Pioneer Asset None Anti-Money the discretion of Management; and Anti-Money Laundering Laundering Officer the Board Officer of all the Pioneer Funds since 2006 ------------------------------------------------------------------------------------------------------------------------------------ 56 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 This page was intentionally left blank. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 57 This page was intentionally left blank. 58 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 This page was intentionally left blank. Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 59 This page was intentionally left blank. 60 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/19 How to Contact Amundi Pioneer We are pleased to offer a variety of convenient ways for you to contact us for assistance or information. Call us for: -------------------------------------------------------------------------------- Account Information, including existing accounts, new accounts, prospectuses, applications and service forms 1-800-225-6292 FactFoneSM for automated fund yields, prices, account information and transactions 1-800-225-4321 Retirement plans information 1-800-622-0176 Write to us: -------------------------------------------------------------------------------- Amundi Pioneer P.O. Box 219427 Kansas City, MO 64121-9427 Our toll-free fax 1-800-225-4240 Our internet e-mail address us.askamundipioneer@amundipioneer.com (for general questions about Amundi Pioneer only) Visit our web site: www.amundipioneer.com/us This report must be preceded or accompanied by a prospectus. The Fund files a complete schedule of portfolio holdings with the Securities and Exchange Commission for the first and third quarters of each fiscal year as an exhibit to its reports on Form N-PORT. Shareholders may view the filed Form N-PORT by visiting the Commission's web site at https://www.sec.gov. [LOGO] Amundi Pioneer ============== ASSET MANAGEMENT Amundi Pioneer Asset Management, Inc. 60 State Street Boston, MA 02109 www.amundipioneer.com/us Securities offered through Amundi Pioneer Distributor, Inc. 60 State Street, Boston, MA 02109 Underwriter of Pioneer Mutual Funds, Member SIPC [C] 2020 Amundi Pioneer Asset Management 23474-10-0120 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)). Mr. David R. Bock, an independent trustee, is such an audit committee financial expert. (3) If the registrant provides the disclosure required by paragraph (a)(1) (ii) of this Item, it must explain why it does not have an audit committee financial expert. Not applicable. ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES. (a) Disclose, under the caption AUDIT FEES, the aggregate fees billed for each of the last two fiscal years for professional services rendered by the principal accountant for the audit of the registrant's annual financial statements or services that are normally provided by the accountant in connection with statutory and regulatory filings or engagements for those fiscal years. The audit fees for the Trust were $23,000 payable to Ernst & Young LLP for the year ended November 30, 2019 and $23,000 for the year ended November 30, 2018. (b) Disclose, under the caption AUDIT-RELATED FEES, the aggregate fees billed in each of the last two fiscal years for assurance and related services by the principal accountant that are reasonably related to the performance of the audit of the registrant's financial statements and are not reported under paragraph (a) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. Audit-Related Fees There were no audit-related services in 2019 or 2018. (c) Disclose, under the caption TAX FEES, the aggregate fees billed in each of the last two fiscal years for professional services rendered by the principal accountant for tax compliance, tax advice, and tax planning. Registrants shall describe the nature of the services comprising the fees disclosed under this category. The tax fees for the Trust were $8,028 payable to Ernst & Young LLP for the year ended November 30, 2019 and $8,028 for the year ended November 30, 2018. (d) Disclose, under the caption ALL OTHER FEES, the aggregate fees billed in each of the last two fiscal years for products and services provided by the principal accountant, other than the services reported in paragraphs (a) through (c) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. There were no other fees in 2019 or 2018. (e) (1) Disclose the audit committee's pre-approval policies and procedures described in paragraph (c)(7) of Rule 2-01 of Regulation S-X. PIONEER FUNDS APPROVAL OF AUDIT, AUDIT-RELATED, TAX AND OTHER SERVICES PROVIDED BY THE INDEPENDENT AUDITOR SECTION I - POLICY PURPOSE AND APPLICABILITY The Pioneer Funds recognize the importance of maintaining the independence of their outside auditors. Maintaining independence is a shared responsibility involving Amudi Pioneer Asset Management, Inc, the audit committee and the independent auditors. The Funds recognize that a Fund's independent auditors: 1) possess knowledge of the Funds, 2) are able to incorporate certain services into the scope of the audit, thereby avoiding redundant work, cost and disruption of Fund personnel and processes, and 3) have expertise that has value to the Funds. As a result, there are situations where it is desirable to use the Fund's independent auditors for services in addition to the annual audit and where the potential for conflicts of interests are minimal. Consequently, this policy, which is intended to comply with Rule 210.2-01(C)(7), sets forth guidelines and procedures to be followed by the Funds when retaining the independent audit firm to perform audit, audit-related tax and other services under those circumstances, while also maintaining independence. Approval of a service in accordance with this policy for a Fund shall also constitute approval for any other Fund whose pre-approval is required pursuant to Rule 210.2-01(c)(7)(ii). In addition to the procedures set forth in this policy, any non-audit services that may be provided consistently with Rule 210.2-01 may be approved by the Audit Committee itself and any pre-approval that may be waived in accordance with Rule 210.2-01(c)(7)(i)(C) is hereby waived. Selection of a Fund's independent auditors and their compensation shall be determined by the Audit Committee and shall not be subject to this policy. SECTION II - POLICY ---------------- -------------------------------- ------------------------------------------------- SERVICE SERVICE CATEGORY DESCRIPTION SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES CATEGORY ---------------- -------------------------------- ------------------------------------------------- I. AUDIT Services that are directly o Accounting research assistance SERVICES related to performing the o SEC consultation, registration independent audit of the Funds statements, and reporting o Tax accrual related matters o Implementation of new accounting standards o Compliance letters (e.g. rating agency letters) o Regulatory reviews and assistance regarding financial matters o Semi-annual reviews (if requested) o Comfort letters for closed end offerings ---------------- -------------------------------- ------------------------------------------------- II. Services which are not o AICPA attest and agreed-upon procedures AUDIT-RELATED prohibited under Rule o Technology control assessments SERVICES 210.2-01(C)(4) (the "Rule") o Financial reporting control assessments and are related extensions of o Enterprise security architecture the audit services support the assessment audit, or use the knowledge/expertise gained from the audit procedures as a foundation to complete the project. In most cases, if the Audit-Related Services are not performed by the Audit firm, the scope of the Audit Services would likely increase. The Services are typically well-defined and governed by accounting professional standards (AICPA, SEC, etc.) ---------------- -------------------------------- ------------------------------------------------- ------------------------------------- ------------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the audit period for all services and related fees pre-approved specific service reported at each regularly subcategories. Approval of the scheduled Audit Committee independent auditors as meeting. auditors for a Fund shall constitute pre approval for these services. ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the fund fiscal year within services and related fees a specified dollar limit (including comparison to for all pre-approved specified dollar limits) specific service subcategories reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limit for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for Audit-Related Services not denoted as "pre-approved", or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------------------ SECTION III - POLICY DETAIL, CONTINUED ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- --------------------------- ----------------------------------------------- III. TAX SERVICES Services which are not o Tax planning and support prohibited by the Rule, o Tax controversy assistance if an officer of the Fund o Tax compliance, tax returns, excise determines that using the tax returns and support Fund's auditor to provide o Tax opinions these services creates significant synergy in the form of efficiency, minimized disruption, or the ability to maintain a desired level of confidentiality. ----------------------- --------------------------- ----------------------------------------------- ------------------------------------- ------------------------- AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------- ------------------------------------- ------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year all such services and within a specified dollar limit related fees 				 (including comparison 			 to specified dollar 			 limits) reported 			 quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for tax services not denoted as pre-approved, or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------- SECTION III - POLICY DETAIL, CONTINUED ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- --------------------------- ----------------------------------------------- IV. OTHER SERVICES Services which are not o Business Risk Management support prohibited by the Rule, o Other control and regulatory A. SYNERGISTIC, if an officer of the Fund compliance projects UNIQUE QUALIFICATIONS determines that using the Fund's auditor to provide these services creates significant synergy in the form of efficiency, minimized disruption, the ability to maintain a desired level of confidentiality, or where the Fund's auditors posses unique or superior qualifications to provide these services, resulting in superior value and results for the Fund. ----------------------- --------------------------- ----------------------------------------------- --------------------------------------- ------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- -------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year within all such services and a specified dollar limit related fees 			 (including comparison 			 to specified dollar 				 limits) reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for "Synergistic" or "Unique Qualifications" Other Services not denoted as pre-approved to the left, or to add a specific service subcategory as "pre-approved" ------------------------------------- -------------------------- SECTION III - POLICY DETAIL, CONTINUED ----------------------- ------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PROHIBITED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- ------------------------- ----------------------------------------------- PROHIBITED SERVICES Services which result 1. Bookkeeping or other services in the auditors losing related to the accounting records or independence status financial statements of the audit under the Rule. client* 2. Financial information systems design and implementation* 3. Appraisal or valuation services, fairness* opinions, or contribution-in-kind reports 4. Actuarial services (i.e., setting actuarial reserves versus actuarial audit work)* 5. Internal audit outsourcing services* 6. Management functions or human resources 7. Broker or dealer, investment advisor, or investment banking services 8. Legal services and expert services unrelated to the audit 9. Any other service that the Public Company Accounting Oversight Board determines, by regulation, is impermissible ----------------------- ------------------------- ----------------------------------------------- ------------------------------------------- ------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------------- ------------------------------ o These services are not to be o A summary of all performed with the exception of the(*) services and related services that may be permitted fees reported at each if they would not be subject to audit regularly scheduled procedures at the audit client (as Audit Committee meeting defined in rule 2-01(f)(4)) level will serve as continual the firm providing the service. confirmation that has 				 not provided any restricted services. ------------------------------------------- ------------------------------ -------------------------------------------------------------------------------- GENERAL AUDIT COMMITTEE APPROVAL POLICY: o For all projects, the officers of the Funds and the Fund's auditors will each make an assessment to determine that any proposed projects will not impair independence. o Potential services will be classified into the four non-restricted service categories and the "Approval of Audit, Audit-Related, Tax and Other Services" Policy above will be applied. Any services outside the specific pre-approved service subcategories set forth above must be specifically approved by the Audit Committee. o At least quarterly, the Audit Committee shall review a report summarizing the services by service category, including fees, provided by the Audit firm as set forth in the above policy. -------------------------------------------------------------------------------- (2) Disclose the percentage of services described in each of paragraphs (b) through (d) of this Item that were approved by the audit committee pursuant to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X. Non-Audit Services Beginning with non-audit service contracts entered into on or after May 6, 2003, the effective date of the new SEC pre-approval rules, the Trust's audit committee is required to pre-approve services to affiliates defined by SEC rules to the extent that the services are determined to have a direct impact on the operations or financial reporting of the Trust. For the years ended November 30 2019 and 2018, there were no services provided to an affiliate that required the Trust's audit committee pre-approval. (f) If greater than 50 percent, disclose the percentage of hours expended on the principal accountants engagement to audit the registrant's financial statements for the most recent fiscal year that were attributed to work performed by persons other than the principal accountant's full-time, permanent employees. N/A (g) Disclose the aggregate non-audit fees billed by the registrants accountant for services rendered to the registrant, and rendered to the registrants investment adviser (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant for each of the last two fiscal years of the registrant. The aggregate non-audit fees for the Trust were $8,028 payable to Ernst & Young LLP for the year ended November 30, 2019 and $8,028 for the year ended November 30, 2018. (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. Item 12. Disclosure of Securities Lending Activities for Closed-End Management Investment Companies. (a) If the registrant is a closed-end management investment company, provide the following dollar amounts of income and compensation related to the securities lending activities of the registrant during its most recent fiscal year: N/A (1) Gross income from securities lending activities; N/A (2) All fees and/or compensation for each of the following securities lending activities and related services: any share of revenue generated by the securities lending program paid to the securities lending agent(s) (revenue split); fees paid for cash collateral management services (including fees deducted from a pooled cash collateral reinvestment vehicle) that are not included in the revenue split; administrative fees that are not included in the revenue split; fees for indemnification that are not included in the revenue split; rebates paid to borrowers; and any other fees relating to the securities lending program that are not included in the revenue split, including a description of those other fees; N/A (3) The aggregate fees/compensation disclosed pursuant to paragraph (2); and N/A (4) Net income from securities lending activities (i.e., the dollar amount in paragraph (1) minus the dollar amount in paragraph (3)). If a fee for a service is included in the revenue split, state that the fee is included in the revenue split. N/A (b) If the registrant is a closed-end management investment company, describe the services provided to the registrant by the securities lending agent in the registrants most recent fiscal year. N/A ITEM 13. EXHIBITS. (a) File the exhibits listed below as part of this Form. Letter or number the exhibits in the sequence indicated. (1) Any code of ethics, or amendment thereto, that is the subject of the disclosure required by Item 2, to the extent that the registrant intends to satisfy the Item 2 requirements through filing of an exhibit. (2) A separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2(a) under the Act (17 CFR 270.30a-2(a)) , exactly as set forth below: Filed herewith. SIGNATURES [See General Instruction F] Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. (Registrant) Pioneer Series Trust II By (Signature and Title)* /s/ Lisa M. Jones Lisa M. Jones, President & Chief Executive Officer Date January 31, 2020 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 January 31, 2020 By (Signature and Title)* /s/ Mark E. Bradley Mark E. Bradley, Treasurer & Chief Accounting & Financial Officer Date January 31, 2020 * Print the name and title of each signing officer under his or her signature.