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


Date of reporting period:  December 1, 2017 through November 30, 2018


Form N-CSR is to be used by management investment companies to file reports with
the Commission not later than 10 days after the transmission to stockholders of
any report that is required to be transmitted to stockholders under Rule 30e-1
under the Investment Company Act of 1940 (17 CFR 270.30e-1).  The Commission may
use the information provided on Form N-CSR in its regulatory, disclosure review,
inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-CSR,
and the Commission will make this information public. A registrant is not
required to respond to the collection of information contained in Form N-CSR
unless the Form displays a currently valid Office of Management and Budget
("OMB") control number. Please direct comments concerning the accuracy of the
information collection burden estimate and any suggestions for reducing the
burden to Secretary, Securities and Exchange Commission, 450 Fifth Street, NW,
Washington, DC 20549-0609.  The OMB has reviewed this collection of information
under the clearance requirements of 44 U.S.C. ss. 3507.


ITEM 1. REPORTS TO STOCKHOLDERS.
  

                                 Pioneer Select
                                 Mid Cap Growth Fund

--------------------------------------------------------------------------------
                                 Annual Report | November 30, 2018
--------------------------------------------------------------------------------

                                 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 Trust's shareholder
reports like this one will no longer be sent by mail, unless you specifically
request paper copies of the reports from the Trust or from your financial
intermediary, such as a broker-dealer, bank or insurance company. Instead, the
reports will be made available on the Trust'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
Trust, by calling 1-800-710-0935.

You may elect to receive all future reports in paper free of charge. If you
invest directly with the Trust, you can inform the Trust that you wish to
continue receiving paper copies of your shareholder reports by calling
1-800-710-0935. 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 with the Pioneer funds complex if you
invest directly.

                                 [LOGO]   Amundi Pioneer
                                          ==============
                                        ASSET MANAGEMENT



                        visit us: www.amundipioneer.com



Table of Contents



                                                                          
President's Letter                                                            2

Portfolio Management Discussion                                               4

Portfolio Summary                                                            10

Prices and Distributions                                                     11

Performance Update                                                           12

Comparing Ongoing Fund Expenses                                              17

Schedule of Investments                                                      19

Financial Statements                                                         26

Notes to Financial Statements                                                35

Report of Independent Registered Public Accounting Firm                      44

Additional Information                                                       46

Approval of Investment Management Agreement                                  48

Trustees, Officers and Service Providers                                     53


                 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 1



President's Letter

Since 1928, active portfolio management based on in-depth, fundamental
research, has been the foundation of Amundi Pioneer's investment approach. We
believe an active management investment strategy is a prudent approach to
investing, especially during periods of market volatility, which can result
from any number of risk factors, including slow U.S. economic growth, rising
interest rates, and geopolitical factors. Of course, in today's global economy,
risk factors extend well beyond U.S. borders, and political and economic issues
on the international front can also cause or contribute to volatility in U.S.
markets.

At Amundi Pioneer, each security under consideration is researched by our team
of experienced investment professionals, who visit companies and meet with
their management teams. At the end of this research process, if we have
conviction in a company's business model and management team, and regard the
security as a potentially solid investment opportunity, an Amundi Pioneer
portfolio manager makes an active decision to invest in that security. The
portfolio resulting from these decisions represents an expression of his or her
convictions, and strives to balance overall risk and return opportunity. As an
example, the Standard & Poor's 500 Index -- the predominant benchmark for many
U.S. Large-Cap Core Equity funds -- has 500 stocks. An Amundi Pioneer portfolio
manager chooses to invest in only those companies that he or she believes can
offer the most attractive opportunities to pursue the fund's investment
objective, thus potentially benefiting the fund's shareowners. This process
results in a portfolio that does not own all 500 stocks, but a much narrower
universe. The same active decision to invest in a company is also applied when
we decide to sell a security, either due to changing fundamentals, valuation
concerns, or market risks. We apply this active decision-making across all of
our equity, fixed-income, and global portfolios.

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 volatility and uncertainty, thus making it a
compelling investment choice. As you consider the many choices today, we
encourage you to work with your financial advisor to develop an overall
investment plan that addresses both your short- and long-term goals, and to
implement such a plan in a disciplined manner.

2 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



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, 2018

Any information in this shareowner report regarding market or economic trends
or the factors influencing the Fund's historical or future performance are
statements of opinion as of the date of this report. Past performance is no
guarantee of future results.

                 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 3



Portfolio Management Discussion | 11/30/18

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, 2018. 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,
      2018?

A     Pioneer Select Mid Cap Growth Fund's Class A shares returned 5.09% at net
      asset value during the 12-month period ended November 30, 2018, while the
      Fund's benchmark, the Russell Midcap Growth Index, returned 5.32%. During
      the same 12-month period, the average return of the 600 mutual funds in
      Morningstar's Mid-Cap Growth Funds category was 4.09%.

Q     How would you describe the investment environment in the equity market
      during the 12-month period ended November 30, 2018?

A     The Fund's fiscal year ended November 30, 2018, was a very volatile
      12-month period for domestic equities. Domestic stock indices rocketed
      higher in the first two months of the period (December 2017 and January
      2018), and then sharply corrected in the third month (February 2018), with
      the Standard & Poor's 500 Index (the S&P 500) falling by 9% from
      peak-to-trough over the course of those first three months. The February
      2018 market correction was driven by a sharp rise in the 10-year
      government (U.S. Treasury) bond yield, which started the 12-month period
      at 2.41%, but rose to 2.95% by mid-February. The increase in the 10-year
      Treasury yield was believed to be a result of heightened inflation
      expectations driven by wage-rate increases, which began to accelerate
      during the January/February period. Additionally, the Federal Reserve (the
      Fed) was, at the same time, signaling its intention to raise short-term
      interest rates throughout 2018 and possibly into 2019.

      The 10-year Treasury yield stabilized at the elevated rate for the
      following six months (through August 2018), however, and so equity
      investors instead began to focus on the strong corporate earnings reports
      that came out over the first two calendar quarters of 2018. The positive
      earnings reports led market participants to bid up stocks again between
      April and September 2018. In addition, during the April-September time
      period, equity returns

4 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



      were buoyed by improved levels in both business and consumer confidence,
      which were the result, to a certain degree, of reduced U.S. business and
      personal income tax rates that went into effect in January 2018.
      Employment trends also improved during the first six months of the
      12-month period, with the unemployment rate reaching 3.8% at the end of
      May, a multi-decade low.

      Market volatility returned after domestic equities peaked again at the end
      of September, however, as October saw another sharp market correction that
      was even larger than the one in February, with the S&P 500 declining by
      10% from peak-to-trough during the month. The October correction
      disproportionately punished stocks of secular growth companies -- which
      are a focus for us in managing the Fund -- and was driven by two large
      concerns that haunted equity markets: 1) the continued prospect for
      multiple short-term interest-rate increases by the Fed in 2018 and 2019,
      even as economic data (particularly in housing) was beginning to soften;
      and 2) the potential dampening effect on the economy and corporate
      earnings of U.S. tariffs, and the threat of a possible trade war with
      China, as the U.S. threatened to substantially increase the level and rate
      of tariffs on Chinese imports beginning on January 1, 2019.

      In November, the final month of the period, domestic stocks were once
      again extremely volatile, as market participants seemed to obsess over the
      two large concerns mentioned earlier. However, despite the significant
      volatility over the period, when all was said and done, the S&P 500 still
      managed to generate a positive return of 6.27% over the 12 months, while
      the Fund's benchmark, the Russell Midcap Growth Index (the Russell Index),
      also finished in positive territory, returning 5.32%. With that said, the
      12-month period ended with equities on shaky ground.

      Within the Russell Index, the top-performing sectors over the 12 months
      were consumer staples, utilities, and information technology, which were
      up by 19.0%, 12.4%, and 12.3%, respectively. Meanwhile, communication
      services, materials, and energy were the benchmark's worst-performing
      sectors for the period, returning 25.5%, 16.4%, and 4.3%, respectively.

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, 2018?

A     Sector allocation was essentially neutral to the Fund's benchmark-relative
      returns during the period, as the benefits of the portfolio's underweights
      to the underperforming communication services and materials sectors were
      largely offset by the negative effects of the Fund's underweights to the
      outperforming consumer staples and information technology sectors.

                 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 5



      With regard to stock selection, the Fund's results were positive overall
      during the period and aided benchmark-relative returns. Stock selection in
      health care was soundly positive for the Fund relative to the benchmark,
      and the strong results in the sector outpaced the negative performance
      from stock selections in industrials and consumer discretionary. Stock
      selection results in all other sectors were mixed, and were a neutral
      factor in the Fund's overall benchmark-relative performance.

Q     Which individual portfolio holdings contributed the most to, or detracted
      the most from, the Fund's benchmark-relative performance during the
      12-month period ended November 30, 2018?

A     Given that stock selection in health care was a significant positive
      contributor to the Fund's benchmark-relative performance during the
      period, it's no surprise that the three individual portfolio holdings that
      aided relative returns the most came from the sector: Foundation Medicine,
      Sage Therapeutics, and Teladoc Health.

      Foundation Medicine provides diagnostic tests that enable optimal,
      personalized cancer treatments. In the fourth quarter of 2017,
      Foundation's shares benefited from a joint announcement by the Food and
      Drug Administration (FDA) and The Centers for Medicare and Medicaid
      Services (CMS) that Medicare would provide coverage for the company's
      "Foundation One" tests (via a parallel review process). Then, in late-June
      2018, Foundation's share price increased again after the company agreed to
      be wholly acquired by its largest investor and partner, Roche. A global
      pharmaceutical and diagnostics company, Roche had purchased a minority
      stake in Foundation in 2015; with the June 2018 acquisition, Roche
      intended to bring Foundation's sequencing diagnostics platform under the
      Roche umbrella by acquiring all of the remaining shares at a 28% premium
      over the shares' trading price prior to the offer. After the acquisition
      offer was announced, we sold the Fund's position in Foundation.

      Sage Therapeutics is a biopharmaceutical company focused on treatments for
      disorders of the central nervous system, including schizophrenia and
      depression. Over the course of 2017, results of eight pipeline studies on
      Sage's therapies strongly affected the stock's performance, as pipeline
      success represented the key driver of share-price appreciation in December
      2017, which is when the bulk of Sage's share-price run-up during the
      period took place. Sage's lead product, "Brexanolene" (SAGE-547),
      successfully completed pivotal studies to assess its effectiveness in the
      treatment of postpartum depression, while another product, SAGE-217,
      demonstrated proof-of-concept in the treatment of major depressive
      disorder. We believe both therapies represent potential breakthroughs in
      the treatment of serious depression.

6 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



      Teladoc Health provides a technology platform and network that enables the
      delivery of medical care to patients by physicians on an on-demand basis,
      by either video conference or telephone. Teladoc's shares rose steadily
      throughout the 12-month period as the company continued to announce new
      partnerships with managed-care providers, which further solidified its
      position as the leading comprehensive virtual-care delivery solution.

      On the downside, the three biggest individual detractors from the Fund's
      benchmark-relative performance during the 12-month period were portfolio
      positions in Hain Celestial (consumer staples) and Hortonworks
      (information technology), and a lack of Fund exposure to the shares of
      Workday (information technology), a large component of the Russell Index.

      Shares of Hain Celestial, a maker of natural and organic foods, declined
      during the period after the company disappointed investors with
      weaker-than-expected sales results as well as projections for weaker
      forward profitability than we had anticipated. We lost confidence in our
      original investment thesis for Hain Celestial, which was based on the
      belief that the company's strategies to prune its product portfolio and
      improve overall profitability would be successful. After the disappointing
      performance, we exited the Fund's position.

      Hortonworks provides a next-generation data management platform based on
      open-source technology. We believe the company has been benefiting from
      the big-data tailwind in information technology and the likely transition
      of enterprises to using open-source data management platforms versus
      proprietary, closed platforms. While growing rapidly on the top-line,
      Hortonworks is not yet profitable, and so investors sold off the company's
      shares in October and November 2018, a period which saw the market's
      preference for stocks of potential growth companies that are not yet
      profitable greatly diminish. In addition, Hortonworks agreed to merge with
      one of its competitors, Cloudera, towards the end of the period. While the
      initial reaction to the deal was positive, investor psychology about it
      turned negative in November after short-sellers tried to convince market
      participants that the merger could be a sign of impending weakness in the
      open-source data-management market. We believe the deal will drive
      shareholder value, and so despite the stock's underperformance during the
      period, we retained the Fund's position in Hortonworks.

      The Fund did not own shares of Workday, a large component of the Russell
      Index, during the 12-month period, and lack of portfolio exposure to the
      stock detracted from benchmark-relative returns. Workday provides
      enterprise cloud-based applications for human capital and financial
      management. The company's shares appreciated significantly during the

                 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 7



      12 months in response to a better-than-expected earnings report for the
      third quarter of 2018. Workday's shares support a very high valuation, and
      given our valuation-sensitive investment process in managing the Fund, we
      did not believe the future discounted earnings potential of the company
      warranted the high valuation, an assessment that turned out to be
      incorrect.

Q     Did the Fund have any derivative exposure during the 12-month period ended
      November 30, 2018?

A     No, we did not invest the Fund in derivative securities during the period.

Q     What is your outlook as the Fund moves into a new fiscal year?

A     As noted earlier, domestic stocks finished the 12-month period ended
      November 30, 2018, on shaky ground, as investors seemed to become obsessed
      with the twin risks of: 1) the possibility of a continued rise in
      short-term interest rates in the face of a potentially slowing economy;
      and 2) the prospect of escalating trade disputes with China, where
      increased tariffs could threaten to stifle both economic growth and
      corporate earnings in 2019.

      We see the potential for both of the above-mentioned risks to be
      ameliorated in early 2019, as the Fed could very well decide to do a "one
      and done" move with respect to interest-rate increases from here, and the
      U.S. government may be able to negotiate a trade agreement with China that
      is acceptable to all parties. However, both situations, and their
      potential resolutions, are difficult to handicap. In any event, we believe
      economic growth is likely to slow in 2019 from the robust pace we have
      witnessed in 2018, but we believe it is unlikely that the economy will go
      into recession in the coming year. In the slower, but stable economic
      environment that we expect, we believe investors are likely to again favor
      stocks of secular growth companies that are not dependent on macroeconomic
      growth in order to flourish.

      We believe larger-cap companies will continue to look to acquire mid-cap
      companies in order to generate top-line growth that is not available in a
      slowing economy; therefore, we believe mid-cap stocks are likely to
      benefit in 2019 and 2020. 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 | 11/30/18



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 | 11/30/18 9



Portfolio Summary | 11/30/18

Portfolio Diversification
--------------------------------------------------------------------------------
(As a percentage of total investments)*

[THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL]



                                                                        
Common Stocks                                                              99.7%
U.S. Government and Agency Obligations                                      0.3%


Sector Distribution
--------------------------------------------------------------------------------
(As a percentage of total investments)*

[THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL]



                                                                        
Information Technology                                                     29.4%
Industrials                                                                17.8%
Health Care                                                                17.2%
Consumer Discretionary                                                     17.2%
Communication Services                                                      4.6%
Financials                                                                  4.0%
Materials                                                                   3.8%
Consumer Staples                                                            2.2%
Real Estate                                                                 1.8%
Energy                                                                      1.7%
Government                                                                  0.3%


10 Largest Holdings
--------------------------------------------------------------------------------
(As a percentage of total investments)*



                                                                        
 1. Live Nation Entertainment, Inc.                                        2.28%
--------------------------------------------------------------------------------
 2. Centene Corp.                                                          1.84
--------------------------------------------------------------------------------
 3. Thomson Reuters Corp.                                                  1.82
--------------------------------------------------------------------------------
 4. IAC/InterActiveCorp                                                    1.73
--------------------------------------------------------------------------------
 5. Dollar Tree, Inc.                                                      1.72
--------------------------------------------------------------------------------
 6. Total System Services, Inc.                                            1.62
--------------------------------------------------------------------------------
 7. Ross Stores, Inc.                                                      1.59
--------------------------------------------------------------------------------
 8. Xilinx, Inc.                                                           1.50
--------------------------------------------------------------------------------
 9. Verisk Analytics, Inc.                                                 1.47
--------------------------------------------------------------------------------
10. Fidelity National Information Services, Inc.                           1.47
--------------------------------------------------------------------------------


*     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 | 11/30/18



Prices and Distributions | 11/30/18

Net Asset Value per Share
--------------------------------------------------------------------------------



--------------------------------------------------------------------------------
        Class               11/30/18                11/30/17
--------------------------------------------------------------------------------
                                               
         A                   $37.99                  $41.43
--------------------------------------------------------------------------------
         C                   $26.28                  $30.53
--------------------------------------------------------------------------------
         K                   $38.69                  $41.95
--------------------------------------------------------------------------------
         R                   $36.24                  $39.93
--------------------------------------------------------------------------------
         Y                   $41.57                  $44.72
--------------------------------------------------------------------------------


Distributions per Share: 12/1/17-11/30/18
--------------------------------------------------------------------------------



--------------------------------------------------------------------------------
                        Net
                     Investment          Short-Term           Long-Term
        Class         Income            Capital Gains        Capital Gains
--------------------------------------------------------------------------------
                                                      
         A             $ --                $ --                $5.5121
--------------------------------------------------------------------------------
         C             $ --                $ --                $5.5121
--------------------------------------------------------------------------------
         K             $ --                $ --                $5.5121
--------------------------------------------------------------------------------
         R             $ --                $ --                $5.5121
--------------------------------------------------------------------------------
         Y             $ --                $ --                $5.5121
--------------------------------------------------------------------------------


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 | 11/30/18 11



Performance Update | 11/30/18                                     Class A Shares

Investment Returns
--------------------------------------------------------------------------------
The mountain chart on the right shows the change in value of a $10,000
investment made in Class A shares of Pioneer 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, 2018)
------------------------------------------------------
                  Net          Public       Russell
                  Asset        Offering     Midcap
                  Value        Price        Growth
Period            (NAV)        (POP)        Index
------------------------------------------------------
                                   
10 Years          15.90%       15.22%       16.64%
5 Years            9.89         8.60        10.17
1 Year             5.09        -0.96         5.32
------------------------------------------------------


Expense Ratio
(Per prospectus dated April 1, 2018)
------------------------------------------------------
                Gross
------------------------------------------------------
             
                1.04%
------------------------------------------------------


[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
                                  
11/08           $ 9,425                 $10,000
11/09           $13,709                 $14,283
11/10           $16,578                 $18,044
11/11           $17,537                 $19,139
11/12           $18,783                 $21,448
11/13           $25,720                 $28,720
11/14           $29,140                 $33,257
11/15           $30,051                 $33,862
11/16           $30,670                 $35,399
11/17           $39,228                 $44,259
11/18           $41,223                 $46,614


Call 1-800-225-6292 or visit www.amundipioneer.com for the most recent
month-end performance results. Current performance may be lower or higher than
the performance data quoted.

The performance data quoted represents past performance, which is no guarantee
of future results. Investment return and principal value will fluctuate, and
shares, when redeemed, may be worth more or less than their original cost.

NAV results represent the percent change in net asset value per share. POP
returns reflect deduction of maximum 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.

The predecessor fund was established in connection with the reorganization of
Regions Morgan Keegan Select Mid Cap Growth Fund into the predecessor fund on
May 15, 2009. The performance of Class A shares of the predecessor fund for
periods prior to May 15, 2009, includes the performance of Regions Morgan
Keegan Select Mid Cap Growth Fund's Class A shares, which has been restated to
reflect differences in any applicable sales charges (but not differences in
expenses). This adjustment has the effect of reducing the previously reported
performance of Regions Morgan Keegan Select Mid Cap Growth Fund. A different
investment adviser served as the adviser of Regions Morgan Keegan Select Mid
Cap Growth Fund.

Please refer to the financial highlights for a more current expense ratio.

12 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



Performance Update | 11/30/18                                     Class C Shares

Investment Returns
--------------------------------------------------------------------------------
The mountain chart on the right shows the change in value of a $10,000
investment made in Class C shares of Pioneer 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, 2018)
------------------------------------------------------
                                            Russell
                                            Midcap
                   If          If           Growth
Period             Held        Redeemed     Index
------------------------------------------------------
                                   
10 Years           14.92%      14.92%       16.64%
5 Years             9.01        9.01        10.17
1 Year              4.24        4.24         5.32
------------------------------------------------------


Expense Ratio
(Per prospectus dated April 1, 2018)
------------------------------------
                Gross
------------------------------------
             
                1.84%
------------------------------------


[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
                                  
11/08           $10,000                 $10,000
11/09           $14,443                 $14,283
11/10           $17,300                 $18,044
11/11           $18,131                 $19,139
11/12           $19,228                 $21,448
11/13           $26,104                 $28,720
11/14           $29,332                 $33,257
11/15           $30,003                 $33,862
11/16           $30,381                 $35,399
11/17           $38,551                 $44,259
11/18           $40,187                 $46,614


Call 1-800-225-6292 or visit www.amundipioneer.com for the most recent
month-end performance results. Current performance may be lower or higher than
the performance data quoted.

The performance data quoted represents past performance, which is no guarantee
of future results. Investment return and principal value will fluctuate, and
shares, when redeemed, may be worth more or less than their original cost.

Class C shares held for less than one year are also subject to a 1% contingent
deferred sales charge (CDSC). "If Held" results represent the percent change in
net asset value per share. NAV returns would have been lower had sales charges
been reflected. All results are historical and assume the reinvestment of
dividends and capital gains. Other share classes are available for which
performance and expenses will differ.

Performance results reflect any applicable expense waivers in effect during the
periods shown. Without such waivers Fund performance would be lower. Waivers
may not be in effect for all funds. Certain fee waivers are contractual through
a specified period. Otherwise, fee waivers can be rescinded at any time. See
the prospectus and financial statements for more information.

The performance table and graph do not reflect the deduction of fees and taxes
that a shareowner would pay on Fund distributions or the redemption of Fund
shares.

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.

The predecessor fund was established in connection with the reorganization of
Regions Morgan Keegan Select Mid Cap Growth Fund into the predecessor fund on
May 15, 2009. The performance of Class C shares of the predecessor fund for
periods prior to May 15, 2009, includes the performance of Regions Morgan
Keegan Select Mid Cap Growth Fund's Class C shares, which has been restated to
reflect differences in any applicable sales charges (but not differences in
expenses). This adjustment has the effect of reducing the previously reported
performance of Regions Morgan Keegan Select Mid Cap Growth Fund. A different
investment adviser served as the adviser of Regions Morgan Keegan Select Mid
Cap Growth Fund.

Please refer to the financial highlights for a more current expense ratio.

                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 13



Performance Update | 11/30/18                                     Class K Shares

Investment Returns
--------------------------------------------------------------------------------
The mountain chart on the right shows the change in value of a $5 million
investment made in Class K shares of Pioneer 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, 2018)
------------------------------------------------------
                           Net            Russell
                           Asset          Midcap
                           Value          Growth
Period                     (NAV)          Index
------------------------------------------------------
                                    
10 Years                   16.07%         16.64%
5 Years                    10.21          10.17
1 Year                      5.45           5.32
------------------------------------------------------


Expense Ratio
(Per prospectus dated April 1, 2018)
------------------------------------------------------
                Gross
------------------------------------------------------
             
                0.67%
------------------------------------------------------


[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
                                  
11/08           $ 5,000,000             $ 5,000,000
11/09           $ 7,272,786             $ 7,141,598
11/10           $ 8,794,509             $ 9,021,839
11/11           $ 9,303,499             $ 9,569,371
11/12           $ 9,964,661             $10,723,755
11/13           $13,644,530             $14,360,031
11/14           $15,458,726             $16,628,583
11/15           $15,996,243             $16,930,972
11/16           $16,392,755             $17,699,539
11/17           $21,041,790             $22,129,702
11/18           $22,188,683             $23,306,798


Call 1-800-225-6292 or visit www.amundipioneer.com for the most recent
month-end performance results. Current performance may be lower or higher than
the performance data quoted.

The performance data quoted represents past performance, which is no guarantee
of future results. Investment return and principal value will fluctuate, and
shares, when redeemed, may be worth more or less than their original cost.

The performance shown for Class 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.

The predecessor fund was established in connection with the reorganization of
Regions Morgan Keegan Select Mid Cap Growth Fund into the predecessor fund on
May 15, 2009. The performance of Class A shares of the predecessor fund for
periods prior to May 15, 2009, includes the performance of Regions Morgan
Keegan Select Mid Cap Growth Fund's Class A shares, which has been restated to
reflect differences in any applicable sales charges (but not differences in
expenses). This adjustment has the effect of reducing the previously reported
performance of Regions Morgan Keegan Select Mid Cap Growth Fund. A different
investment adviser served as the adviser of Regions Morgan Keegan Select Mid
Cap Growth Fund.

Please refer to the financial highlights for a more current expense ratio.

14 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



Performance Update | 11/30/18                                     Class R Shares

Investment Returns
--------------------------------------------------------------------------------
The mountain chart on the right shows the change in value of a $10,000
investment made in Class R shares of Pioneer 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, 2018)
------------------------------------------------------
                        Net               Russell
                        Asset             Midcap
                        Value             Growth
Period                  (NAV)             Index
------------------------------------------------------
                                    
10 Years                15.65%            16.64%
5 Years                  9.47             10.17
1 Year                   4.65              5.32
------------------------------------------------------


Expense Ratio
(Per prospectus dated April 1, 2018)
------------------------------------------------------
                Gross
------------------------------------------------------
             
                1.45%
------------------------------------------------------


[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
                                  
11/08           $10,000                 $10,000
11/09           $14,546                 $14,283
11/10           $17,589                 $18,044
11/11           $18,607                 $19,139
11/12           $19,929                 $21,448
11/13           $27,241                 $28,720
11/14           $30,742                 $33,257
11/15           $31,587                 $33,862
11/16           $32,125                 $35,399
11/17           $40,916                 $44,259
11/18           $42,818                 $46,614


Call 1-800-225-6292 or visit www.amundipioneer.com for the most recent
month-end performance results. Current performance may be lower or higher than
the performance data quoted.

The performance data quoted represents past performance, which is no guarantee
of future results. Investment return and principal value will fluctuate, and
shares, when redeemed, may be worth more or less than their original cost.

Class 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.

The predecessor fund was established in connection with the reorganization of
Regions Morgan Keegan Select Mid Cap Growth Fund into the predecessor fund on
May 15, 2009. The performance shown for Class R shares of the Fund for periods
prior to May 15, 2009, is based on the performance of Regions Morgan Keegan
Select Mid Cap Growth Fund's Class A shares, which has been restated to reflect
differences in any applicable sales charges and the higher distribution and
service fees of Class R shares of the Fund (but not differences in expenses).
This adjustment has the effect of reducing the previously reported performance
of Regions Morgan Keegan Select Mid Cap Growth Fund. A different investment
adviser served as the adviser of Regions Morgan Keegan Select Mid Cap Growth
Fund.

Please refer to the financial highlights for a more current expense ratio.

                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 15



Performance Update | 11/30/18                                     Class Y Shares

Investment Returns
--------------------------------------------------------------------------------
The mountain chart on the right shows the change in value of a $5 million
investment made in Class Y shares of Pioneer 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, 2018)
------------------------------------------------------
                           Net            Russell
                           Asset          Midcap
                           Value          Growth
Period                     (NAV)          Index
------------------------------------------------------
                                    
10 Years                   16.30%         16.64%
5 Years                    10.20          10.17
1 Year                      5.36           5.32
------------------------------------------------------


Expense Ratio
(Per prospectus dated April 1, 2018)
------------------------------------------------------
                Gross
------------------------------------------------------
             
                0.79%
------------------------------------------------------


[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
                                  
11/08           $ 5,000,000             $ 5,000,000
11/09           $ 7,303,931             $ 7,141,598
11/10           $ 8,870,541             $ 9,021,839
11/11           $ 9,420,411             $ 9,569,371
11/12           $10,136,279             $10,723,755
11/13           $13,926,501             $14,360,031
11/14           $15,833,476             $16,628,583
11/15           $16,374,060             $16,930,972
11/16           $16,755,936             $17,699,539
11/17           $21,477,980             $22,129,702
11/18           $22,629,104             $23,306,798


Call 1-800-225-6292 or visit www.amundipioneer.com for the most recent
month-end performance results. Current performance may be lower or higher than
the performance data quoted.

The performance data quoted represents past performance, which is no guarantee
of future results. Investment return and principal value will fluctuate, and
shares, when redeemed, may be worth more or less than their original cost.

Class Y shares are not subject to sales charges and are available for limited
groups of eligible investors, including institutional investors. All results
are historical and assume the reinvestment of dividends and capital gains.
Other share classes are available for which performance and expenses will
differ.

Performance results reflect any applicable expense waivers in effect during the
periods shown. Without such waivers Fund performance would be lower. Waivers
may not be in effect for all funds. Certain fee waivers are contractual through
a specified period. Otherwise, fee waivers can be rescinded at any time. See
the prospectus and financial statements for more information.

The 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.

The predecessor fund was established in connection with the reorganization of
Regions Morgan Keegan Select Mid Cap Growth Fund into the predecessor fund on
May 15, 2009. The performance of Class Y shares of the predecessor fund for
periods prior to May 15, 2009, includes the performance of Regions Morgan
Keegan Select Mid Cap Growth Fund's Class I shares, which has been restated to
reflect differences in any applicable sales charges (but not differences in
expenses). This adjustment has the effect of reducing the previously reported
performance of Regions Morgan Keegan Select Mid Cap Growth Fund. A different
investment adviser served as the adviser of Regions Morgan Keegan Select Mid
Cap Growth Fund.

Please refer to the financial highlights for a more current expense ratio.

16 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



Comparing Ongoing Fund Expenses

As a shareowner in the Fund, you incur two types of costs:

(1)   ongoing costs, including management fees, distribution and/or service
      (12b-1) fees, and other Fund expenses; and

(2)   transaction costs, including sales charges (loads) on purchase payments.

This example is intended to help you understand your ongoing expenses (in
dollars) of investing in the Fund and to compare these costs with the ongoing
costs of investing in other mutual funds. The example is based on an investment
of $1,000 at the beginning of the Fund's latest six-month period and held
throughout the six months.

Using the Tables
--------------------------------------------------------------------------------
Actual Expenses

The first table below provides information about actual account values and
actual expenses. You may use the information in this table, together with the
amount you invested, to estimate the expenses that you paid over the period as
follows:

(1)   Divide your account value by $1,000
      Example: an $8,600 account value (divided by) $1,000 = 8.6

(2)   Multiply the result in (1) above by the corresponding share class's number
      in the third row under the heading entitled "Expenses Paid During Period"
      to estimate the expenses you paid on your account during this period.

Expenses Paid on a $1,000 Investment in Pioneer Select Mid Cap Growth Fund

Based on actual returns from June 1, 2018, through November 30, 2018.



--------------------------------------------------------------------------------------------------
Share Class                        A             C             K             R             Y
--------------------------------------------------------------------------------------------------
                                                                        
Beginning Account              $1,000.00     $1,000.00     $1,000.00     $1,000.00     $1,000.00
Value on 6/1/18
--------------------------------------------------------------------------------------------------
Ending Account                 $  972.25     $  968.23     $  973.68     $  969.79     $  973.12
Value (after expenses)
on 11/30/18
--------------------------------------------------------------------------------------------------
Expenses Paid                  $    5.04     $    8.78     $    3.27     $    7.11     $    3.86
During Period*
--------------------------------------------------------------------------------------------------


*     Expenses are equal to the Fund's annualized expense ratio of 1.02%, 1.78%,
      0.66%, 1.44% and 0.78% 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 | 11/30/18 17



Hypothetical Example for Comparison Purposes

The table below provides information about hypothetical account values and
hypothetical expenses based on the Fund's actual expense ratio and an assumed
rate of return of 5% per year before expenses, which is not the Fund's actual
return. The hypothetical account values and expenses may not be used to
estimate the actual ending account balance or expenses you paid for the
period.

You may use this information to compare the ongoing costs of investing in the
Fund and other funds. To do so, compare this 5% hypothetical example with the
5% hypothetical examples that appear in the shareholder reports of the other
funds.

Please note that the expenses shown in the tables are meant to highlight your
ongoing costs only and do not reflect any transaction costs, such as sales
charges (loads) that are charged at the time of the transaction. Therefore, the
table below is useful in comparing ongoing costs only and will not help you
determine the relative total costs of owning different funds. In addition, if
these transaction costs were included, your costs would have been higher.

Expenses Paid on a $1,000 Investment in Pioneer Select Mid Cap Growth Fund

Based on a hypothetical 5% return per year before expenses, reflecting the
period from June 1, 2018, through November 30, 2018.



--------------------------------------------------------------------------------------------------
Share Class                        A             C             K             R             Y
--------------------------------------------------------------------------------------------------
                                                                        
Beginning Account              $1,000.00     $1,000.00     $1,000.00     $1,000.00     $1,000.00
Value on 6/1/18
--------------------------------------------------------------------------------------------------
Ending Account                 $1,019.95     $1,016.14     $1,021.76     $1,017.85     $1,021.16
Value (after expenses)
on 11/30/18
--------------------------------------------------------------------------------------------------
Expenses Paid                  $    5.16     $    9.00     $    3.35     $    7.28     $    3.95
During Period*
--------------------------------------------------------------------------------------------------


*     Expenses are equal to the Fund's annualized expense ratio of 1.02%, 1.78%,
      0.66%, 1.44% and 0.78% 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 | 11/30/18



Schedule of Investments | 11/30/18



----------------------------------------------------------------------------------------------------
Shares                                                                                Value
----------------------------------------------------------------------------------------------------
                                                                                
                    UNAFFILIATED ISSUERS -- 99.7%
                    COMMON STOCKS -- 98.6% of Net Assets
                    Aerospace & Defense -- 1.4%
  136,703           Harris Corp.                                                      $   19,541,694
  109,630           Textron, Inc.                                                          6,154,628
                                                                                      --------------
                    Total Aerospace & Defense                                         $   25,696,322
----------------------------------------------------------------------------------------------------
                    Air Freight & Logistics -- 1.3%
  299,690(a)        XPO Logistics, Inc.                                               $   22,734,483
                                                                                      --------------
                    Total Air Freight & Logistics                                     $   22,734,483
----------------------------------------------------------------------------------------------------
                    Airlines -- 0.7%
  173,686           Alaska Air Group, Inc.                                            $   12,724,236
                                                                                      --------------
                    Total Airlines                                                    $   12,724,236
----------------------------------------------------------------------------------------------------
                    Auto Components -- 0.8%
  190,339           Aptiv Plc                                                         $   13,685,374
                                                                                      --------------
                    Total Auto Components                                             $   13,685,374
----------------------------------------------------------------------------------------------------
                    Banks -- 0.7%
   47,691(a)        SVB Financial Group                                               $   12,152,144
                                                                                      --------------
                    Total Banks                                                       $   12,152,144
----------------------------------------------------------------------------------------------------
                    Beverages -- 1.0%
   46,042           Constellation Brands, Inc.                                        $    9,013,182
  140,404(a)        Monster Beverage Corp.                                                 8,379,311
                                                                                      --------------
                    Total Beverages                                                   $   17,392,493
----------------------------------------------------------------------------------------------------
                    Biotechnology -- 4.8%
   96,491(a)        Alnylam Pharmaceuticals, Inc.                                     $    7,831,210
  254,561(a)        Esperion Therapeutics, Inc.                                           13,532,463
  253,614(a)        Exact Sciences Corp.                                                  19,776,820
  237,504(a)        FibroGen, Inc.                                                        10,298,173
   68,761(a)        Loxo Oncology, Inc.                                                    9,655,420
   89,442(a)        Sage Therapeutics, Inc.                                               10,311,768
  109,122(a)        Sarepta Therapeutics, Inc.                                            14,128,025
                                                                                      --------------
                    Total Biotechnology                                               $   85,533,879
----------------------------------------------------------------------------------------------------
                    Building Products -- 2.3%
  270,189           Fortune Brands Home & Security, Inc.                              $   11,834,278
  350,562           Owens Corning                                                         18,281,808
  155,158(a)        Trex Co., Inc.                                                         9,888,219
                                                                                      --------------
                    Total Building Products                                           $   40,004,305
----------------------------------------------------------------------------------------------------
                    Capital Markets -- 2.4%
  141,230           MSCI, Inc.                                                        $   22,185,821
   68,045           S&P Global, Inc.                                                      12,442,709
  162,318           TD Ameritrade Holding Corp.                                            8,734,331
                                                                                      --------------
                    Total Capital Markets                                             $   43,362,861
----------------------------------------------------------------------------------------------------


The accompanying notes are an integral part of these financial statements.

                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 19



Schedule of Investments | 11/30/18 (continued)



----------------------------------------------------------------------------------------------------
Shares                                                                                Value
----------------------------------------------------------------------------------------------------
                                                                                
                    Chemicals -- 1.4%
  101,874           Ashland Global Holdings, Inc.                                     $    8,342,462
  160,865           CF Industries Holdings, Inc.                                           6,786,894
  256,764           Mosaic Co.                                                             9,243,504
                                                                                      --------------
                    Total Chemicals                                                   $   24,372,860
----------------------------------------------------------------------------------------------------
                    Commercial Services & Supplies -- 1.2%
  267,970           Waste Connections, Inc.                                           $   21,030,285
                                                                                      --------------
                    Total Commercial Services & Supplies                              $   21,030,285
----------------------------------------------------------------------------------------------------
                    Communications Equipment -- 0.7%
   71,525(a)        Palo Alto Networks, Inc.                                          $   12,370,249
                                                                                      --------------
                    Total Communications Equipment                                    $   12,370,249
----------------------------------------------------------------------------------------------------
                    Construction Materials -- 0.9%
  156,856           Vulcan Materials Co.                                              $   16,581,248
                                                                                      --------------
                    Total Construction Materials                                      $   16,581,248
----------------------------------------------------------------------------------------------------
                    Containers & Packaging -- 1.5%
  128,436           Avery Dennison Corp.                                              $   12,381,230
  135,413(a)        Berry Global Group, Inc.                                               6,813,982
   70,864           Packaging Corp. of America                                             6,931,917
                                                                                      --------------
                    Total Containers & Packaging                                      $   26,127,129
----------------------------------------------------------------------------------------------------
                    Diversified Consumer Services -- 1.7%
  138,561(a)        Grand Canyon Education, Inc.                                      $   16,954,324
  310,718(a)        ServiceMaster Global Holdings, Inc.                                   13,755,486
                                                                                      --------------
                    Total Diversified Consumer Services                               $   30,709,810
----------------------------------------------------------------------------------------------------
                    Electrical Equipment -- 0.4%
  232,763(a)        TPI Composites, Inc.                                              $    6,328,826
                                                                                      --------------
                    Total Electrical Equipment                                        $    6,328,826
----------------------------------------------------------------------------------------------------
                    Electronic Equipment, Instruments & Components -- 1.4%
  272,252           CDW Corp.                                                         $   25,232,315
                                                                                      --------------
                    Total Electronic Equipment, Instruments & Components              $   25,232,315
----------------------------------------------------------------------------------------------------
                    Energy Equipment & Services -- 0.9%
  563,804(a)        Cactus, Inc.                                                      $   16,282,660
                                                                                      --------------
                    Total Energy Equipment & Services                                 $   16,282,660
----------------------------------------------------------------------------------------------------
                    Entertainment -- 2.3%
  716,519(a)        Live Nation Entertainment, Inc.                                   $   39,895,778
                                                                                      --------------
                    Total Entertainment                                               $   39,895,778
----------------------------------------------------------------------------------------------------
                    Equity Real Estate Investment Trusts (REIT) -- 1.8%
  174,077           CubeSmart                                                         $    5,420,758
  271,940           Liberty Property Trust                                                12,316,163
   81,320(a)        SBA Communications Corp.                                              13,890,269
                                                                                      --------------
                    Total Equity Real Estate Investment Trusts (REIT)                 $   31,627,190
----------------------------------------------------------------------------------------------------


The accompanying notes are an integral part of these financial statements.

20 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18





----------------------------------------------------------------------------------------------------
Shares                                                                                Value
----------------------------------------------------------------------------------------------------
                                                                                
                    Food Products -- 1.1%
1,011,601(a)        Nomad Foods, Ltd.                                                 $   20,454,572
                                                                                      --------------
                    Total Food Products                                               $   20,454,572
----------------------------------------------------------------------------------------------------
                    Health Care Equipment & Supplies -- 4.6%
   44,247(a)        ABIOMED, Inc.                                                     $   14,720,092
   88,697(a)        Align Technology, Inc.                                                20,390,553
  333,913(a)        Boston Scientific Corp.                                               12,578,503
  100,840(a)        DexCom, Inc.                                                          13,067,856
   68,751(a)        Inogen, Inc.                                                          10,131,147
   77,593(a)        Penumbra, Inc.                                                        10,802,497
                                                                                      --------------
                    Total Health Care Equipment & Supplies                            $   81,690,648
----------------------------------------------------------------------------------------------------
                    Health Care Providers & Services -- 4.4%
  107,566(a)        Amedisys, Inc.                                                    $   14,655,867
  226,082(a)        Centene Corp.                                                         32,160,165
   36,346           Humana, Inc.                                                          11,974,917
   73,713(a)        WellCare Health Plans, Inc.                                           18,787,969
                                                                                      --------------
                    Total Health Care Providers & Services                            $   77,578,918
----------------------------------------------------------------------------------------------------
                    Health Care Technology -- 2.0%
  253,135(a)        Teladoc Health, Inc.                                              $   15,808,281
  198,244(a)        Veeva Systems, Inc.                                                   19,063,143
                                                                                      --------------
                    Total Health Care Technology                                      $   34,871,424
----------------------------------------------------------------------------------------------------
                    Hotels, Restaurants & Leisure -- 5.1%
  302,064           Aramark                                                           $   11,496,556
  263,062           Brinker International, Inc.                                           13,437,207
   20,787(a)        Chipotle Mexican Grill, Inc.                                           9,836,616
  116,646           Dave & Buster's Entertainment, Inc.                                    6,632,491
  137,792           Hilton Worldwide Holdings, Inc.                                       10,408,808
  201,517(a)        Planet Fitness, Inc.                                                  11,127,769
  137,474           Six Flags Entertainment Corp.                                          8,435,404
  523,873           Wendy's Co.                                                            9,393,043
  308,126           Yum China Holdings, Inc.                                              11,040,155
                                                                                      --------------
                    Total Hotels, Restaurants & Leisure                               $   91,808,049
----------------------------------------------------------------------------------------------------
                    Industrial Conglomerates -- 1.0%
   61,140           Roper Technologies, Inc.                                          $   18,194,653
                                                                                      --------------
                    Total Industrial Conglomerates                                    $   18,194,653
----------------------------------------------------------------------------------------------------
                    Insurance -- 0.8%
   85,761           Aon Plc                                                           $   14,159,999
                                                                                      --------------
                    Total Insurance                                                   $   14,159,999
----------------------------------------------------------------------------------------------------
                    Interactive Media & Services -- 1.7%
  170,193(a)        IAC/InterActiveCorp                                               $   30,287,547
                                                                                      --------------
                    Total Interactive Media & Services                                $   30,287,547
----------------------------------------------------------------------------------------------------


The accompanying notes are an integral part of these financial statements.

                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 21



Schedule of Investments | 11/30/18 (continued)



----------------------------------------------------------------------------------------------------
Shares                                                                                Value
----------------------------------------------------------------------------------------------------
                                                                                
                    Internet & Direct Marketing Retail -- 1.6%
  122,011           Expedia Group, Inc.                                               $   14,737,709
  178,066(a)        GrubHub, Inc.                                                         13,940,787
                                                                                      --------------
                    Total Internet & Direct Marketing Retail                          $   28,678,496
----------------------------------------------------------------------------------------------------
                    IT Services -- 9.4%
   86,989           DXC Technology Co.                                                $    5,483,787
  106,996(a)        EPAM Systems, Inc.                                                    13,936,229
   78,466(a)        Euronet Worldwide, Inc.                                                9,228,386
  238,082           Fidelity National Information Services, Inc.                          25,700,952
  648,285(a)        First Data Corp.                                                      12,369,278
  116,366(a)        FleetCor Technologies, Inc.                                           22,505,184
   65,625(a)        Gartner, Inc.                                                         10,053,094
  206,158           Perspecta, Inc.                                                        4,351,995
  325,286           Total System Services, Inc.                                           28,420,238
   76,174(a)        WEX, Inc.                                                             11,804,685
  256,372(a)        Worldpay, Inc.                                                        21,999,281
                                                                                      --------------
                    Total IT Services                                                 $  165,853,109
----------------------------------------------------------------------------------------------------
                    Life Sciences Tools & Services -- 0.9%
   45,068(a)        Illumina, Inc.                                                    $   15,210,450
                                                                                      --------------
                    Total Life Sciences Tools & Services                              $   15,210,450
----------------------------------------------------------------------------------------------------
                    Machinery -- 5.5%
  320,949           Albany International Corp.                                        $   23,223,869
  640,709(a)        ATS Automation Tooling Systems, Inc.                                   8,204,392
  326,312           Fortive Corp.                                                         24,822,554
  135,334           Stanley Black & Decker, Inc.                                          17,708,454
  310,115           Xylem, Inc.                                                           22,632,193
                                                                                      --------------
                    Total Machinery                                                   $   96,591,462
----------------------------------------------------------------------------------------------------
                    Media -- 0.6%
  134,503           Nexstar Media Group, Inc.                                         $   11,115,328
                                                                                      --------------
                    Total Media                                                       $   11,115,328
----------------------------------------------------------------------------------------------------
                    Multiline Retail -- 1.7%
  347,425(a)        Dollar Tree, Inc.                                                 $   30,146,067
                                                                                      --------------
                    Total Multiline Retail                                            $   30,146,067
----------------------------------------------------------------------------------------------------
                    Oil, Gas & Consumable Fuels -- 0.8%
  264,439           Cabot Oil & Gas Corp.                                             $    6,653,285
  105,260           Marathon Petroleum Corp.                                               6,858,741
                                                                                      --------------
                    Total Oil, Gas & Consumable Fuels                                 $   13,512,026
----------------------------------------------------------------------------------------------------
                    Pharmaceuticals -- 0.4%
  178,777(a)        Nektar Therapeutics                                               $    7,220,803
                                                                                      --------------
                    Total Pharmaceuticals                                             $    7,220,803
----------------------------------------------------------------------------------------------------


The accompanying notes are an integral part of these financial statements.

22 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18





----------------------------------------------------------------------------------------------------
Shares                                                                                Value
----------------------------------------------------------------------------------------------------
                                                                                
                    Professional Services -- 3.9%
   31,793(a)        CoStar Group, Inc.                                                $   11,744,016
  631,998           Thomson Reuters Corp.                                                 31,802,139
  209,540(a)        Verisk Analytics, Inc.                                                25,840,473
                                                                                      --------------
                    Total Professional Services                                       $   69,386,628
----------------------------------------------------------------------------------------------------
                    Semiconductors & Semiconductor Equipment -- 4.6%
  785,969(a)        Advanced Micro Devices, Inc.                                      $   16,741,140
   74,963           Analog Devices, Inc.                                                   6,890,599
  649,399           Cypress Semiconductor Corp.                                            9,026,646
  369,049(a)        Micron Technology, Inc.                                               14,230,529
  476,154(a)        ON Semiconductor Corp.                                                 9,132,634
  283,858           Xilinx, Inc.                                                          26,251,188
                                                                                      --------------
                    Total Semiconductors & Semiconductor Equipment                    $   82,272,736
  --------------------------------------------------------------------------------------------------
                    Software -- 11.5%
  108,429(a)        Atlassian Corp. PLC                                               $    9,318,388
   71,799           Blackbaud, Inc.                                                        5,259,277
  468,370(a)        Hortonworks, Inc.                                                      7,540,757
  106,444           Intuit, Inc.                                                          22,835,431
  146,271(a)        PTC, Inc.                                                             12,650,979
  365,713(a)        RealPage, Inc.                                                        18,863,476
   57,641(a)        Red Hat, Inc.                                                         10,292,377
  137,200(a)        ServiceNow, Inc.                                                      25,419,044
   88,410(a)        Splunk, Inc.                                                           9,878,049
  508,518           SS&C Technologies Holdings, Inc.                                      24,485,142
  199,704(a)        Synopsys, Inc.                                                        18,360,786
  145,244(a)        Tableau Software, Inc.                                                18,103,212
   73,875(a)        Trade Desk, Inc.                                                      10,523,494
  172,301(a)        Zendesk, Inc.                                                         10,239,848
                                                                                      --------------
                    Total Software                                                    $  203,770,260
----------------------------------------------------------------------------------------------------
                    Specialty Retail -- 5.6%
  133,429(a)        Burlington Stores, Inc.                                           $   22,117,191
   50,621(a)        O'Reilly Automotive, Inc.                                             17,554,350
  317,765           Ross Stores, Inc.                                                     27,836,214
  150,278           Tractor Supply Co.                                                    14,295,946
   55,674(a)        Ulta Beauty, Inc.                                                     16,579,161
                                                                                      --------------
                    Total Specialty Retail                                            $   98,382,862
----------------------------------------------------------------------------------------------------
                    Technology Hardware, Storage & Peripherals -- 1.3%
  164,711           NetApp, Inc.                                                      $   11,014,225
  644,166(a)        Pure Storage, Inc.                                                    12,181,179
                                                                                      --------------
                    Total Technology Hardware, Storage & Peripherals                  $   23,195,404
----------------------------------------------------------------------------------------------------


The accompanying notes are an integral part of these financial statements.

                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 23



Schedule of Investments | 11/30/18 (continued)



----------------------------------------------------------------------------------------------------
Shares                                                                                Value
----------------------------------------------------------------------------------------------------
                                                                                
                    Textiles, Apparel & Luxury Goods -- 0.5%
   73,037           PVH Corp.                                                         $    8,071,319
                                                                                      --------------
                    Total Textiles, Apparel & Luxury Goods                            $    8,071,319
----------------------------------------------------------------------------------------------------
                    TOTAL COMMON STOCKS
                    (Cost $1,423,152,439)                                             $1,746,297,207
----------------------------------------------------------------------------------------------------


----------------------------------------------------------------------------------------------------
Principal
Amount
USD ($)
----------------------------------------------------------------------------------------------------
                                                                                
                    U.S. GOVERNMENT AND AGENCY OBLIGATION --
                    0.3% of Net Assets
5,855,000(b)        U.S. Treasury Bills, 12/11/18                                     $    5,852,203
----------------------------------------------------------------------------------------------------
                    TOTAL U.S. GOVERNMENT AND AGENCY OBLIGATION
                    (Cost $5,851,471)                                                 $    5,852,203
----------------------------------------------------------------------------------------------------
                    TEMPORARY CASH INVESTMENTS --
                    0.8% of Net Assets
                    COMMERCIAL PAPERS -- 0.8%
4,410,000           Federation des Caisses Desjardins du Quebec, 2.16%,
                    12/3/18                                                           $    4,409,192
4,410,000           Natixis NY, 2.16%, 12/3/18                                             4,409,196
4,410,000           Prudential Funding LLC, 2.15%, 12/3/18                                 4,409,179
                                                                                      --------------
                                                                                      $   13,227,567
----------------------------------------------------------------------------------------------------
                    TOTAL TEMPORARY CASH INVESTMENTS
                    (Cost $13,228,415)                                                $   13,227,567
----------------------------------------------------------------------------------------------------
                    TOTAL INVESTMENTS IN UNAFFILIATED ISSUERS -- 99.7%
                    (Cost $1,442,232,325)                                             $1,765,376,977
----------------------------------------------------------------------------------------------------
                    OTHER ASSETS AND LIABILITIES -- 0.3%                              $    5,329,225
----------------------------------------------------------------------------------------------------
                    NET ASSETS -- 100.0%                                              $1,770,706,202
====================================================================================================


REIT     Real Estate Investment Trust.

(a)      Non-income producing security.

(b)      Security issued with a zero coupon. Income is recognized through
         accretion of discount.

Purchases and sales of securities (excluding temporary cash investments) for
the year ended November 30, 2018, aggregated $1,511,566,103 and
$1,410,347,586, 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, 2018, the Fund did not engage in cross trade activity.

The accompanying notes are an integral part of these financial statements.

24 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



At November 30, 2018, the net unrealized appreciation on investments based on
cost for federal tax purposes of $1,448,241,132 was as follows:



                                                                                     
           Aggregate gross unrealized appreciation for all investments in which
             there is an excess of value over tax cost                                  $ 374,744,628
           Aggregate gross unrealized depreciation for all investments in which
             there is an excess of tax cost over value                                    (57,608,783)
                                                                                        -------------
           Net unrealized appreciation                                                  $ 317,135,845
                                                                                        =============


Various inputs are used in determining the value of the Fund's investments.
These inputs are summarized in the three broad levels below.

   Level 1 - quoted prices in active markets for identical securities.

   Level 2 - other significant observable inputs (including quoted prices for
             similar securities, interest rates, prepayment speeds, credit
             risks, etc.). See Notes to Financial Statements -- Note 1A.

   Level 3 - significant unobservable inputs (including the Fund's own
             assumptions in determining fair value of investments). See Notes to
             Financial Statements -- Note 1A.

The following is a summary of the inputs used as of November 30, 2018, in
valuing the Fund's investments.



----------------------------------------------------------------------------------------------------------
                                            Level 1            Level 2        Level 3    Total
----------------------------------------------------------------------------------------------------------
                                                                             
Common Stocks                               $1,746,297,207     $        --    $ --       $1,746,297,207
U.S. Government and
   Agency Obligation                                    --       5,852,203      --            5,852,203
Commercial Papers                                       --      13,227,567      --           13,227,567
----------------------------------------------------------------------------------------------------------
Total Investments in Securities             $1,746,297,207     $19,079,770    $ --       $1,765,376,977
==========================================================================================================


During the year ended November 30, 2018, 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 | 11/30/18 25



Statement of Assets and Liabilities | 11/30/18



                                                                                 
ASSETS:
  Investments in unaffiliated issuers, at value (cost $1,442,232,325)               $1,765,376,977
  Cash                                                                                   5,340,214
  Foreign currencies, at value (cost $6,091)                                                 6,046
  Receivables --
     Investment securities sold                                                          5,336,857
     Fund shares sold                                                                    6,040,622
     Dividends                                                                           1,365,354
  Other assets                                                                              64,735
--------------------------------------------------------------------------------------------------
        Total assets                                                                $1,783,530,805
==================================================================================================
LIABILITIES:
  Payables --
     Investment securities purchased                                                $    6,283,273
     Fund shares repurchased                                                             5,825,148
     Trustees' fees                                                                         13,851
  Due to affiliates                                                                         99,939
  Accrued expenses                                                                         602,392
--------------------------------------------------------------------------------------------------
        Total liabilities                                                           $   12,824,603
==================================================================================================
NET ASSETS:
  Paid-in capital                                                                   $1,468,228,725
  Distributable earnings                                                               302,477,477
--------------------------------------------------------------------------------------------------
        Net assets                                                                  $1,770,706,202
==================================================================================================
NET ASSET VALUE PER SHARE:
No par value (unlimited number of shares authorized)
  Class A (based on $1,124,956,127/29,615,284 shares)                               $        37.99
  Class C (based on $40,955,859/1,558,212 shares)                                   $        26.28
  Class K (based on $52,763,994/1,363,758 shares)                                   $        38.69
  Class R (based on $19,340,710/533,675 shares)                                     $        36.24
  Class Y (based on $532,689,512/12,815,197 shares)                                 $        41.57
MAXIMUM OFFERING PRICE PER SHARE:
  Class A (based on $37.99 net asset value per share/
     100%-5.75% maximum sales charge)                                               $        40.31
==================================================================================================


The accompanying notes are an integral part of these financial statements.

26 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



Statement of Operations

For the Year Ended 11/30/18



                                                                                       
INVESTMENT INCOME:
  Dividends from unaffiliated issuers (net of foreign taxes
     withheld $70,808)                                                 $   9,718,278
  Interest from unaffiliated issuers                                         227,814
-----------------------------------------------------------------------------------------------------------
       Total investment income                                                               $   9,946,092
===========================================================================================================
EXPENSES:
  Management fees                                                      $  10,359,348
  Administrative expense                                                     620,652
  Transfer agent fees
     Class A                                                               1,090,640
     Class C                                                                  60,323
     Class K                                                                     792
     Class R                                                                  64,252
     Class Y                                                                 521,453
  Distribution fees
     Class A                                                               2,950,933
     Class C                                                                 596,905
     Class R                                                                 117,085
  Shareowner communications expense                                          249,510
  Custodian fees                                                              31,584
  Registration fees                                                          104,591
  Professional fees                                                           91,320
  Printing expense                                                            44,029
  Pricing fees                                                                    20
  Trustees' fees                                                              78,072
  Insurance expense                                                           17,439
  Miscellaneous                                                               73,473
-----------------------------------------------------------------------------------------------------------
     Total expenses                                                                          $  17,072,421
-----------------------------------------------------------------------------------------------------------
       Net investment income                                                                 $  (7,126,329)
-----------------------------------------------------------------------------------------------------------
REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS:
  Net realized gain (loss) on:
     Investments in unaffiliated issuers                               $ 196,280,590
     Class actions                                                           181,194
     Other assets and liabilities denominated in
       foreign currencies                                                     (6,468)        $ 196,455,316
-----------------------------------------------------------------------------------------------------------
  Change in net unrealized appreciation (depreciation) on:
     Investments in unaffiliated issuers                               $(117,512,910)
     Other assets and liabilities denominated in
       foreign currencies                                                        156         $(117,512,754)
-----------------------------------------------------------------------------------------------------------
  Net realized and unrealized gain (loss) on investments                                     $  78,942,562
-----------------------------------------------------------------------------------------------------------
  Net increase in net assets resulting from operations                                       $  71,816,233
===========================================================================================================


The accompanying notes are an integral part of these financial statements.

                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 27



Statements of Changes in Net Assets



--------------------------------------------------------------------------------------------------------
                                                                  Year Ended            Year Ended
                                                                  11/30/18              11/30/17
--------------------------------------------------------------------------------------------------------
                                                                                  
FROM OPERATIONS:
Net investment income (loss)                                      $   (7,126,329)       $   (4,341,390)
Net realized gain (loss) on investments                              196,455,316           135,904,298
Change in net unrealized appreciation (depreciation)
  on investments                                                    (117,512,754)          217,639,337
--------------------------------------------------------------------------------------------------------
     Net increase in net assets resulting from operations         $   71,816,233        $  349,202,245
--------------------------------------------------------------------------------------------------------
DISTRIBUTIONS TO SHAREOWNERS:
  Class A ($5.51 and $3.49 per share, respectively)               $ (143,556,531)       $  (87,832,063)*
  Class C ($5.51 and $3.49 per share, respectively)                   (7,160,458)           (6,458,271)*
  Class K ($5.51 and $3.49 per share, respectively)                   (6,535,713)           (1,849,419)*
  Class R ($5.51 and $3.49 per share, respectively)                   (2,550,557)           (3,022,279)*
  Class Y ($5.51 and $3.49 per share, respectively)                  (62,678,957)          (23,448,758)*
--------------------------------------------------------------------------------------------------------
     Total distributions to shareowners                           $ (222,482,216)       $ (122,610,790)
--------------------------------------------------------------------------------------------------------
FROM FUND SHARE TRANSACTIONS:
Net proceeds from sales of shares                                 $  486,524,930        $  216,576,398
Reinvestment of distributions                                        205,882,519           114,844,091
Cost of shares repurchased                                          (350,297,199)         (263,007,259)
--------------------------------------------------------------------------------------------------------
     Net increase in net assets resulting from Fund
       share transactions                                         $  342,110,250        $   68,413,230
--------------------------------------------------------------------------------------------------------
     Net increase in net assets                                   $  191,444,267        $  295,004,685
NET ASSETS:**
Beginning of year                                                  1,579,261,935         1,284,257,250
--------------------------------------------------------------------------------------------------------
End of year                                                       $1,770,706,202        $1,579,261,935
========================================================================================================


*     For the year ended November 30, 2017, distributions to shareowners were
      presented as net realized gain.

**    For the year ended November 30, 2017, undistributed net investment income
      was $0.


The accompanying notes are an integral part of these financial statements.

28 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18





-----------------------------------------------------------------------------------------------------------
                                           Year Ended      Year Ended        Year Ended      Year Ended
                                           11/30/18        11/30/18          11/30/17        11/30/17
                                           Shares          Amount            Shares          Amount
-----------------------------------------------------------------------------------------------------------
                                                                                 
Class A
Shares sold                                 2,572,411      $ 114,247,632      1,805,446      $  70,141,545
Reinvestment of distributions               3,626,698        136,908,029      2,013,319         83,190,401
Less shares repurchased                    (3,722,577)      (163,953,540)    (3,737,736)      (145,423,396)
-----------------------------------------------------------------------------------------------------------
     Net increase                           2,476,532      $  87,202,121         81,029      $   7,908,550
===========================================================================================================
Class C
Shares sold                                   493,058      $  16,119,837        308,825      $   9,108,739
Reinvestment of distributions                 230,233          6,013,689        188,697          5,745,821
Less shares repurchased                    (1,226,631)       (41,733,534)      (612,441)       (18,060,172)
-----------------------------------------------------------------------------------------------------------
     Net decrease                            (503,340)     $ (19,600,008)      (114,919)     $  (3,205,612)
===========================================================================================================
Class K
Shares sold                                   807,805      $  36,547,459        457,472      $  17,514,596
Reinvestment of distributions                 150,492          5,786,423         44,202          1,849,419
Less shares repurchased                      (171,000)        (7,639,875)      (416,409)       (15,395,774)
-----------------------------------------------------------------------------------------------------------
     Net increase                             787,297      $  34,694,007         85,265      $   3,968,241
===========================================================================================================
Class R
Shares sold                                   230,454      $   9,548,711        312,987      $  11,657,980
Reinvestment of distributions                  52,413          1,887,905         26,615          1,060,063
Less shares repurchased                      (678,123)       (28,114,194)      (505,964)       (19,497,070)
-----------------------------------------------------------------------------------------------------------
     Net decrease                            (395,256)     $ (16,677,578)      (166,362)     $  (6,779,027)
===========================================================================================================
Class Y
Shares sold                                 6,349,307      $ 310,061,291      2,581,939      $ 108,153,538
Reinvestment of distributions               1,338,331         55,286,473        515,543         22,998,387
Less shares repurchased                    (2,269,088)      (108,856,056)    (1,562,327)       (64,630,847)
-----------------------------------------------------------------------------------------------------------
     Net increase                           5,418,550      $ 256,491,708      1,535,155      $  66,521,078
===========================================================================================================


The accompanying notes are an integral part of these financial statements.

                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 29



Financial Highlights



------------------------------------------------------------------------------------------------------------------------------------
                                                              Year           Year           Year         Year           Year
                                                              Ended          Ended          Ended        Ended          Ended
                                                              11/30/18       11/30/17       11/30/16*    11/30/15*      11/30/14*
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                         
Class A
Net asset value, beginning of period                          $    41.43     $    35.13     $  35.00     $    36.92     $    37.55
------------------------------------------------------------------------------------------------------------------------------------
Increase (decrease) from investment operations:
  Net investment income (loss)                                $    (0.20)(a) $    (0.12)(a) $  (0.04)(a) $    (0.15)(a) $    (0.17)
  Net realized and unrealized gain (loss) on investments            2.27           9.91         0.76           1.30           5.16
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) from investment operations            $     2.07     $     9.79     $   0.72     $     1.15     $     4.99
------------------------------------------------------------------------------------------------------------------------------------
Distributions to shareowners:
  Net realized gain                                           $    (5.51)    $    (3.49)    $  (0.59)    $    (3.07)    $    (5.62)
------------------------------------------------------------------------------------------------------------------------------------
Total distributions                                           $    (5.51)    $    (3.49)    $  (0.59)    $    (3.07)    $    (5.62)
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                    $    (3.44)    $     6.30     $   0.13     $    (1.92)    $    (0.63)
------------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                $    37.99     $    41.43     $  35.13     $    35.00     $    36.92
====================================================================================================================================
Total return (b)                                                    5.09%(c)      27.90%(d)     2.06%          3.13%(e)      13.30%
Ratio of net expenses to average net assets                         1.02%          1.04%        1.06%          1.06%          1.09%
Ratio of net investment income (loss) to average net assets        (0.45)%        (0.32)%      (0.12)%        (0.40)%        (0.48)%
Portfolio turnover rate                                               82%            83%          99%            91%           105%
Net assets, end of period (in thousands)                      $1,124,956     $1,124,242     $950,638     $1,009,964     $1,016,065
====================================================================================================================================


*     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 | 11/30/18





------------------------------------------------------------------------------------------------------------------------------------
                                                                      Year         Year         Year         Year         Year
                                                                      Ended        Ended        Ended        Ended        Ended
                                                                      11/30/18     11/30/17     11/30/16*    11/30/15*    11/30/14*
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                           
Class C
Net asset value, beginning of period                                  $ 30.53      $ 26.82      $ 27.07      $ 29.47      $ 31.23
------------------------------------------------------------------------------------------------------------------------------------
Increase (decrease) from investment operations:
  Net investment income (loss)                                        $ (0.40)(a)  $ (0.33)(a)  $ (0.24)(a)  $ (0.37)(a)  $ (0.34)
  Net realized and unrealized gain (loss) on investments                 1.66         7.53         0.58         1.04         4.20
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) from investment operations                    $ 1.26       $  7.20      $  0.34      $  0.67      $  3.86
------------------------------------------------------------------------------------------------------------------------------------
Distributions to shareowners:
  Net realized gain                                                   $ (5.51)     $ (3.49)     $ (0.59)     $ (3.07)     $ (5.62)
------------------------------------------------------------------------------------------------------------------------------------
Total distributions                                                   $ (5.51)     $ (3.49)     $ (0.59)     $ (3.07)     $ (5.62)
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                            $ (4.25)     $  3.71      $ (0.25)     $ (2.40)     $ (1.76)
------------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                        $ 26.28      $ 30.53      $ 26.82      $ 27.07      $ 29.47
====================================================================================================================================
Total return (b)                                                         4.24%       26.89%        1.26%        2.29%(c)    12.37%
Ratio of net expenses to average net assets                              1.78%        1.84%        1.86%        1.87%        1.91%
Ratio of net investment income (loss) to average net assets             (1.22)%      (1.11)%      (0.92)%      (1.20)%      (1.30)%
Portfolio turnover rate                                                    82%          83%          99%          91%         105%
Net assets, end of period (in thousands)                              $40,956      $62,937      $58,377      $69,528      $71,942
====================================================================================================================================


*     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 | 11/30/18 31



Financial Highlights (continued)



------------------------------------------------------------------------------------------------------------------------------------
                                                                         Year          Year           Year
                                                                         Ended         Ended          Ended          12/31/14
                                                                         11/30/18      11/30/17       11/30/16*      to 11/30/15*
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                         
Class K
Net asset value, beginning of period                                     $ 41.95       $ 35.41        $ 35.13        $ 37.00
------------------------------------------------------------------------------------------------------------------------------------
Increase (decrease) from investment operations:
  Net investment income (loss) (a)                                       $ (0.03)      $  0.01(b)     $  0.09(b)     $  0.01
  Net realized and unrealized gain (loss) on investments                    2.28         10.02           0.78           1.19
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) from investment operations                       $  2.25       $ 10.03        $  0.87        $  1.20
------------------------------------------------------------------------------------------------------------------------------------
Distributions to shareowners:
  Net realized gain                                                      $ (5.51)      $ (3.49)       $ (0.59)       $ (3.07)
------------------------------------------------------------------------------------------------------------------------------------
Total distributions                                                      $ (5.51)      $ (3.49)       $ (0.59)       $ (3.07)
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                               $ (3.26)      $  6.54        $  0.28        $ (1.87)
------------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                           $ 38.69       $ 41.95        $ 35.41        $ 35.13
====================================================================================================================================
Total return (c)                                                            5.45%        28.36%(d)       2.48%          3.25%(e)(f)
Ratio of net expenses to average net assets                                 0.66%         0.67%          0.68%          0.67%(g)
Ratio of net investment income (loss) to average net assets                (0.07)%        0.03%          0.27%          0.03%(g)
Portfolio turnover rate                                                       82%           83%            99%            91%
Net assets, end of period (in thousands)                                 $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 in 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 | 11/30/18





------------------------------------------------------------------------------------------------------------------------------------
                                                                   Year          Year          Year          Year          Year
                                                                   Ended         Ended         Ended         Ended         Ended
                                                                   11/30/18      11/30/17      11/30/16*     11/30/15*     11/30/14*
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                            
Class R
Net asset value, beginning of period                               $ 39.93       $ 34.10       $ 34.11       $ 36.19       $ 37.05
------------------------------------------------------------------------------------------------------------------------------------
Increase (decrease) from investment operations:
  Net investment income (loss)                                     $ (0.37)(a)   $ (0.27)(a)   $ (0.16)(a)   $ (0.29)(a)   $ (0.23)
  Net realized and unrealized gain (loss) on investments              2.19          9.59          0.74          1.28          4.99
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) from investment operations                 $  1.82       $  9.32       $  0.58       $  0.99       $  4.76
------------------------------------------------------------------------------------------------------------------------------------
Distributions to shareowners:
  Net realized gain                                                $ (5.51)      $ (3.49)      $ (0.59)      $ (3.07)      $ (5.62)
------------------------------------------------------------------------------------------------------------------------------------
Total distributions                                                $ (5.51)      $ (3.49)      $ (0.59)      $ (3.07)      $ (5.62)
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                         $ (3.69)      $  5.83       $ (0.01)      $ (2.08)      $ (0.86)
------------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                     $ 36.24       $ 39.93       $ 34.10       $ 34.11       $ 36.19
====================================================================================================================================
Total return (b)                                                      4.65%        27.37%         1.70%         2.75%(c)     12.85%
Ratio of net expenses to average net assets                           1.44%         1.45%         1.43%         1.45%         1.49%
Ratio of net investment income (loss) to average net assets          (0.88)%       (0.72)%       (0.49)%       (0.77)%       (0.87)%
Portfolio turnover rate                                                 82%           83%           99%           91%          105%
Net assets, end of period (in thousands)                           $19,341       $37,092       $37,351       $25,973       $14,591
====================================================================================================================================


*     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 | 11/30/18 33



Financial Highlights (continued)



------------------------------------------------------------------------------------------------------------------------------------
                                                                    Year         Year         Year           Year         Year
                                                                    Ended        Ended        Ended          Ended        Ended
                                                                    11/30/18     11/30/17     11/30/16*      11/30/15*    11/30/14*
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                           
Class Y
Net asset value, beginning of period                                $  44.72     $  37.62     $  37.34       $  39.08     $  39.32
------------------------------------------------------------------------------------------------------------------------------------
Increase (decrease) from investment operations:
  Net investment income (loss)                                      $  (0.10)(a) $  (0.03)(a) $   0.05(a)(b) $  (0.04)(a) $  (0.03)
  Net realized and unrealized gain (loss) on investments                2.46        10.62         0.82           1.37         5.41
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) from investment operations                  $   2.36     $  10.59     $   0.87       $   1.33     $   5.38
------------------------------------------------------------------------------------------------------------------------------------
Distributions to shareowners:
  Net realized gain                                                 $  (5.51)    $  (3.49)    $  (0.59)      $  (3.07)    $  (5.62)
------------------------------------------------------------------------------------------------------------------------------------
Total distributions                                                 $  (5.51)    $  (3.49)    $  (0.59)      $  (3.07)    $  (5.62)
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                          $  (3.15)    $   7.10     $   0.28       $  (1.74)    $  (0.24)
------------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                      $  41.57     $  44.72     $  37.62       $  37.34     $  39.08
====================================================================================================================================
Total return (c)                                                        5.36%(d)    28.18%        2.33%(e)       3.42%(f)    13.69%
Ratio of net expenses to average net assets                             0.78%        0.79%        0.82%          0.77%        0.76%
Ratio of net investment income (loss) to average net assets            (0.20)%      (0.07)%       0.12%         (0.09)%      (0.16)%
Portfolio turnover rate                                                   82%          83%          99%            91%         105%
Net assets, end of period (in thousands)                            $532,690     $330,810     $220,496       $206,479     $102,721
====================================================================================================================================


*     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 in 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 | 11/30/18



Notes to Financial Statements | 11/30/18

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 six classes of shares designated as Class A, Class C, Class K,
Class R, Class T and Class Y shares. Class T had not commenced operations as of
November 30, 2018. Each class of shares represents an interest in the same
portfolio of investments of the Fund and has identical rights (based on
relative net asset values) to assets and liquidation proceeds. Share classes
can bear different rates of class-specific fees and expenses, such as transfer
agent and distribution fees. Differences in class-specific fees and expenses
will result in differences in net investment income and, therefore, the payment
of different dividends from net investment income earned by each class. The
Amended and Restated Declaration of Trust of the Fund gives the Board of
Trustees the flexibility to specify either per-share voting or dollar-weighted
voting when submitting matters for shareowner approval. Under per-share voting,
each share of a class of the Fund is entitled to one vote. Under
dollar-weighted voting, a shareowner's voting power is determined not by the
number of shares owned, but by the dollar value of the shares on the record
date. Each share class has exclusive voting rights with respect to matters
affecting only that class, including with respect to the distribution plan for
that class. There is no distribution plan for Class 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 | 11/30/18 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

36 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



      independent third party pricing service. When independent third party
      pricing services are unable to supply prices, or when prices or market
      quotations are considered to be unreliable, the value of that security may
      be determined using quotations from one or more broker-dealers.

      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, 2018, 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 | 11/30/18 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 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, 2018, the Fund did not accrue any
      interest or penalties with respect to uncertain tax positions, which, if
      applicable, would be recorded as an income tax expense on the Statement of
      Operations. Tax returns filed within the prior three years remain subject
      to examination by federal and state tax authorities.

      The amount and character of income and capital gain distributions to
      shareowners are determined in accordance with federal income tax rules,
      which may differ from U.S. GAAP. Distributions in excess of net investment
      income or net realized gains are temporary over distributions for
      financial statement purposes resulting from differences in the recognition
      or classification of income or distributions for financial statement and
      tax purposes. Capital accounts within the financial statements are
      adjusted for permanent book/tax differences to reflect tax character, but
      are not adjusted for temporary differences.

      At November 30, 2018, the Fund reclassified $3,335,230 to increase
      distributable earnings and $3,335,230 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 | 11/30/18



      The Fund has elected to defer $15,393,376 of capital losses recognized
      between November 1, 2018, through November 30, 2018, to its fiscal year
      ending November 30, 2019.

      The tax character of distributions paid during the years ended November
      30, 2018, and November 30, 2017, were as follows:



      --------------------------------------------------------------------------
                                                          2018             2017
      --------------------------------------------------------------------------
                                                             
      Distributions paid from:
      Short-term capital gain                     $         --     $ 12,348,127
      Long-term capital gain                       222,482,216      110,262,663
      --------------------------------------------------------------------------
          Total                                   $222,482,216     $122,610,790
      ==========================================================================


      The following shows the components of distributable earnings on a federal
      income tax basis at November 30, 2018:



      --------------------------------------------------------------------------
                                                                           2018
      --------------------------------------------------------------------------
                                                                
      Distributable earnings:
      Undistributed long-term gain                                 $    735,053
      Current year late year loss deferral                          (15,393,376)
      Net unrealized appreciation                                   317,135,800
      --------------------------------------------------------------------------
          Total                                                    $302,477,477
      ==========================================================================


      The difference between book-basis and tax-basis net unrealized
      appreciation is attributable to the tax deferral of losses on wash sales.

E.    Fund Shares

      The Fund records sales and repurchases of its shares as of trade date. The
      Distributor earned $76,825 in underwriting commissions on the sale of
      Class A shares during the year ended November 30, 2018.

F.    Class Allocations

      Income, common expenses and realized and unrealized gains and losses are
      calculated at the Fund level and allocated daily to each class of shares
      based on its respective percentage of adjusted net assets at the beginning
      of the day.

      Distribution fees are calculated based on the average daily net asset
      value attributable to Class A, Class C and Class R shares of the Fund,
      respectively (see Note 4). Class K and Class Y shares do not pay
      distribution fees. All expenses and fees paid to the Fund's transfer agent
      for its services are allocated among the classes of shares based on the
      number of accounts in each class and the ratable allocation of related
      out-of-pocket expenses (see Note 3).

                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 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.

      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 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

40 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



      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. Effective October 1, 2018, 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, 0.575% of
the assets next $4 billion and 0.55% on 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 and 0.575% on assets over $1 billion. For the year ended
November 30, 2018, the effective management fee was equivalent to 0.60% 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
$72,009 in management fees, administrative costs and certain other
reimbursements payable to the Adviser at November 30, 2018.

3. Transfer Agent

DST Asset Manager Solutions, Inc. serves as the transfer agent to the Fund at
negotiated rates. Transfer agent fees and payables shown on the Statement of
Operations and the Statement of Assets and Liabilities, respectively, include
sub-transfer agent expenses incurred through the Fund's omnibus relationship
contracts.

In addition, the Fund reimbursed the transfer agent for out-of-pocket expenses
incurred by the transfer agent related to shareowner communications activities
such as proxy and statement mailings, and outgoing phone calls. For the year
ended November 30, 2018, such out-of-pocket expenses by class of shares were as
follows:

                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 41





--------------------------------------------------------------------------------
Shareowner Communications:
--------------------------------------------------------------------------------
                                                                    
Class A                                                                $212,262
Class C                                                                  15,020
Class K                                                                     608
Class R                                                                   1,774
Class Y                                                                  19,846
--------------------------------------------------------------------------------
 Total                                                                 $249,510
================================================================================


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 $27,930 in distribution fees payable to the Distributor at
November 30, 2018.

The Fund also has adopted a separate service plan for Class R shares (the
"Service Plan"). The Service Plan authorizes the Fund to pay securities
dealers, plan administrators or other service organizations that agree to
provide certain services to retirement plans or plan participants holding
shares of the Fund a service fee of up to 0.25% of the Fund's average daily net
assets attributable to Class R shares held by such plans.

In addition, redemptions of each class of shares (except Class K, Class R and
Class Y shares) may be subject to a contingent deferred sales charge ("CDSC").
A CDSC of 1.00% may be imposed on redemptions of certain net asset value
purchases of Class A shares within 12 months of purchase. Redemptions of Class
C shares within 12 months of purchase are subject to a CDSC of 1.00%, based on
the lower of cost or market value of shares being redeemed. Shares purchased as
part of an exchange remain subject to any CDSC that applied to the original
purchase of those shares. There is no CDSC for Class K, Class R and Class Y
shares. Proceeds from the CDSCs are paid to the Distributor. For the year ended
November 30, 2018, CDSCs in the amount of $9,246 were paid to the Distributor.

42 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



5. Line of Credit Facility

The Fund, along with certain other funds in the Pioneer Family of Funds (the
"Funds"), participates in a committed, unsecured revolving line of credit
facility. Borrowings are used solely for temporary or emergency purposes. The
Fund may borrow up to the lesser of the amount available under the facility or
the limits set for borrowing by the Fund's prospectus and the 1940 Act.
Effective August 1, 2018, the Fund participates in a credit facility that is in
the amount of $250 million. Prior to August 1, 2018, the credit facility was in
the amount of $195 million. Under such credit facility, depending on the type
of loan, interest on borrowings is payable at the London Interbank Offered Rate
("LIBOR") plus 0.90% on an annualized basis, or the Alternate Base Rate, which
is the greater of (a) the facility's administrative agent's daily announced
prime rate on the borrowing date, (b) 2% plus the Federal Funds Rate on the
borrowing date, or (c) 2% plus the overnight Eurodollar rate on the borrowing
date. The Funds pay an annual commitment fee to participate in a credit
facility. The commitment fee is allocated among participating Funds based on an
allocation schedule set forth in the credit agreement. For the year ended
November 30, 2018, the Fund had no borrowings under the credit facility.

                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 43



Report of Independent Registered Public Accounting Firm

To the Board of Trustees and the Shareholders 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, including
the schedule of investments, of Pioneer Select Mid Cap Growth Fund (the "Fund")
(one of the funds constituting Pioneer Series Trust II (the "Trust")) as of
November 30, 2018, and the related statements of operations, changes in net
assets and the financial highlights for the year then ended and the related
notes, and the statement of changes in net assets and financial highlights for
the year ended November 30, 2017 (collectively referred to as the "financial
statements"). The financial highlights for periods ended November 30, 2014,
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 at November 30, 2018, the results of its
operations, the changes in its net assets, and the financial highlights for the
year ended, and the statement of changes in net assets and financial highlights
for the year ended November 30, 2017, in conformity with U.S. generally
accepted accounting principles.

Basis for Opinion

These financial statements are the responsibility of the Fund's management. Our
responsibility is to express an opinion on the Fund's financial statements
based on our audits. We are a public accounting firm registered with the Public
Company Accounting Oversight Board (United States) ("PCAOB") and are required
to be independent with respect to the Fund in accordance with the U.S. federal
securities laws and the applicable rules and regulations of the Securities and
Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those
standards require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material
misstatement, whether due to error or fraud. The Fund is not required to have,
nor were we engaged to perform, an audit of the Fund's internal control over
financial reporting. As part of our audits, we are required to obtain an
understanding of internal control over financial reporting, but not for the
purpose of expressing an opinion on the effectiveness of the Fund's internal
control over financial reporting. Accordingly, we express no such opinion.

44 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



Our audits included performing procedures to assess the risks of material
misstatement of the financial statements, whether due to error or fraud, and
performing procedures that respond to those risks. Such procedures included
examining, on a test basis, evidence regarding the amounts and disclosures in
the financial statements. Our procedures included confirmation of securities
owned as of November 30, 2018, by correspondence with the custodian and
brokers. Our audits also included evaluating the accounting principles used and
significant estimates made by management, as well as evaluating the overall
presentation of the financial statements. We believe that our audits provide a
reasonable basis for our opinion.

                                                           /s/ Ernst & Young LLP

We have served as the Fund's auditor since 2017.

Boston, Massachusetts
January 28, 2019

                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 45



ADDITIONAL INFORMATION (unaudited)

Change in Independent Registered Public Accounting Firm

Prior to July 3, 2017 Pioneer Investment Management, Inc. (the "Adviser"), the
Fund's investment adviser, was an indirect, wholly owned subsidiary of
UniCredit S.p.A. ("UniCredit"). On that date, UniCredit completed the sale of
its Pioneer Investments business, which includes the Adviser, to Amundi (the
"Transaction"). As a result of the Transaction, the Adviser became an indirect,
wholly owned subsidiary of Amundi. Amundi is controlled by Credit Agricole S.A.
Amundi is headquartered in Paris, France, and, as of September 30, 2016, had
more than $1.1 trillion in assets under management worldwide.

Deloitte & Touche LLP ("D&T"), the Fund's previous independent registered
public accounting firm, informed the Audit Committee and the Board that it
would no longer be independent with respect to the Fund upon the completion of
the Transaction as a result of certain services being provided to Amundi and
Credit Agricole, and, accordingly, that it intended to resign as the Fund's
independent registered public accounting firm upon the completion of the
Transaction. D&T's resignation was effective on July 3, 2017, when the
Transaction was completed.

During the periods as to which D&T has served as the Fund's independent
registered public accounting firm, D&T's reports on the Fund's financial
statements have not contained an adverse opinion or disclaimer of opinion and
have not been qualified or modified as to uncertainty, audit scope or
accounting principles. Further, there have been no disagreements with D&T on
any matter of accounting principles or practices, financial statement
disclosure, or auditing scope or procedure, which, if not resolved to the
satisfaction of D&T, would have caused D&T to make reference to the subject
matter of the disagreement in connection with its report on the financial
statements. In addition, there have been no reportable events of the kind
described in Item 304(a)(1)(v) of Regulation S-K under the Securities Exchange
Act of 1934.

Effective immediately following the completion of the Transaction on July 3,
2017, the Board, acting upon the recommendation of the Audit Committee, engaged
an independent registered public accounting firm, Ernst & Young LLP ("EY").

Prior to its engagement, EY had advised the Fund's Audit Committee that EY had
identified the following matters, in each case relating to services rendered by
other member firms of Ernst & Young Global Limited, all of which are located
outside the United States, to UniCredit and certain of its subsidiaries

46 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



during the period commencing July 1, 2016, that it determined to be
inconsistent with the auditor independence rules set forth by the Securities
and Exchange Commission ("SEC"): (a) project management support services to
UniCredit in the Czech Republic, Germany, Italy, Serbia and Slovenia in
relation to twenty-two projects, that were determined to be inconsistent with
Rule 2-01(c)(4)(vi) of Regulation S-X (management functions); (b) two
engagements for UniCredit in Italy where fees were contingent/success based and
that were determined to be inconsistent with Rule 2-01(c)(5) of Regulation S-X
(contingent fees); (c) four engagements where legal and expert services were
provided to UniCredit in the Czech Republic and Germany, and twenty engagements
where the legal advisory services were provided to UniCredit in Austria, Czech
Republic, Italy and Poland, that were determined to be inconsistent with Rule
2-01(c)(4)(ix) and (x) of Regulation S-X (legal and expert services); and (d)
two engagements for UniCredit in Italy involving assistance in the sale of
certain assets, that were determined to be inconsistent with Rule
2-01(c)(4)(viii) of Regulation S-X (broker-dealer, investment adviser or
investment banking services). None of the foregoing services involved the Fund,
any of the other Funds in the Pioneer Family of Funds or any other Pioneer
entity sold by UniCredit in the Transaction.

EY advised the Audit Committee that it had considered the matters described
above and had concluded that such matters would not impair EY's ability to
exercise objective and impartial judgment in connection with the audits of the
financial statements of the Fund under the SEC and Public Company Accounting
Oversight Board independence rules, and that a reasonable investor with
knowledge of all relevant facts and circumstances would reach the same
conclusion. Management and the Audit Committee considered these matters and
discussed the matters with EY and, based upon EY's description of the matters
and statements made by EY, Management and the Audit Committee believe that EY
will be capable of exercising objective and impartial judgment in connection
with the audits of the financial statements of the Fund, and Management further
believes that a reasonable investor with knowledge of all relevant facts and
circumstances would reach the same conclusion.

                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 47



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 2018 as the Trustees of the Fund
agreed on, among other things, an overall approach and timeline for the
process. Contract review materials were provided to the Trustees in March 2018,
July 2018 and September 2018. In addition, the Trustees reviewed and discussed
the Fund's performance at regularly scheduled meetings throughout the year, and
took into account other information related to the Fund provided to the
Trustees at regularly scheduled meetings, in connection with the review of the
Fund's investment management agreement.

In March 2018, the Trustees, among other things, discussed the memorandum
provided by Fund counsel that summarized the legal standards and other
considerations that are relevant to the Trustees in their deliberations
regarding the renewal of the investment management agreement, and reviewed and
discussed the qualifications of the investment management teams for the Fund,
as well as the level of investment by the Fund's portfolio managers in the
Fund. In July 2018, the Trustees, among other things, reviewed the Fund's
management fees and total expense ratios, the financial statements of APAM and
its parent companies, profitability analyses provided by APAM, and analyses
from APAM as to possible economies of scale. The Trustees also reviewed the
profitability of the institutional business of APAM and APAM's affiliate,
Amundi Pioneer Institutional Asset Management, Inc. ("APIAM" and, together with
APAM, "Amundi Pioneer"), as compared to that of APAM's fund management
business, and considered the differences between the fees and expenses of the
Fund and the fees and expenses of APAM's and APIAM's institutional accounts, as
well as the different services provided by APAM to the Fund and by APAM and
APIAM to the institutional accounts. The Trustees further considered contract
review materials, including additional materials received in response to the
Trustees' request, in September 2018.

At a meeting held on September 18, 2018, based on their evaluation of the
information provided by APAM and third parties, the Trustees of the Fund,
including the Independent Trustees voting separately, unanimously approved the
renewal of the investment management agreement for another year. In

48 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



approving the renewal of the investment management agreement, the Trustees
considered various factors that they determined were relevant, including the
factors described below. The Trustees did not identify any single factor as the
controlling factor in determining to approve the renewal of the agreement.

Nature, Extent and Quality of Services

The Trustees considered the nature, extent and quality of the services that had
been provided by APAM to the Fund, taking into account the investment objective
and strategy of the Fund. The Trustees also reviewed APAM's investment approach
for the Fund and its research process. The Trustees considered the resources of
APAM and the personnel of APAM who provide investment management services to
the Fund. They also reviewed the amount of non-Fund assets managed by the
portfolio managers of the Fund. They considered the non-investment resources
and personnel of APAM that are involved in APAM's services to the Fund,
including APAM's compliance, risk management, and legal resources and
personnel. The Trustees noted the substantial attention and high priority given
by APAM's senior management to the Pioneer Fund complex.

The Trustees considered that APAM supervises and monitors the performance of
the Fund's service providers and provides the Fund with personnel (including
Fund officers) and other resources that are necessary for the Fund's business
management and operations. The Trustees also considered that, as administrator,
APAM is responsible for the administration of the Fund's business and other
affairs. The Trustees considered the fees paid to APAM for the provision of
administration services.

Based on these considerations, the Trustees concluded that the nature, extent
and quality of services that had been provided by APAM to the Fund were
satisfactory and consistent with the terms of the investment management
agreement.

Performance of the Fund

In considering the Fund's performance, the Trustees regularly review and
discuss throughout the year data prepared by APAM and information comparing the
Fund's performance with the performance of its peer group of funds, as
classified by Morningstar, Inc. (Morningstar), and the performance of the
Fund's benchmark index. They also discuss the Fund's performance with APAM on a
regular basis. The Trustees' regular reviews and discussions were factored into
the Trustees' deliberations concerning the renewal of the investment management
agreement.

                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 49



Management Fee and Expenses

The Trustees considered information showing the fees and expenses of the Fund
in comparison to the management fees of its peer group of funds as classified
by Morningstar and also to the expense ratios of a peer group of funds selected
on the basis of criteria determined by the Independent Trustees for this
purpose using data provided by Strategic Insight Mutual Fund Research and
Consulting, LLC (Strategic Insight), an independent third party. The peer group
comparisons referred to below are organized in quintiles. Each quintile
represents one-fifth of the peer group. In all peer group comparisons referred
to below, first quintile is most favorable to the Fund's shareowners. The
Trustees noted that they separately review and consider the impact of the
Fund's transfer agency and Fund- and APAM-paid expenses for sub-transfer agency
and intermediary arrangements, and that the results of the most recent such
review were considered in the consideration of the Fund's expense ratio.

The Trustees considered that the Fund's management fee for the most recent
fiscal year was in the 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.

50 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



The Trustees concluded that the management fee payable by the Fund to APAM was
reasonable in relation to the nature and quality of the services provided by
APAM.

Profitability

The Trustees considered information provided by APAM regarding the
profitability of APAM with respect to the advisory services provided by APAM to
the Fund, including the methodology used by APAM in allocating certain of its
costs to the management of the Fund. The Trustees also considered APAM's profit
margin in connection with the overall operation of the Fund. They further
reviewed the financial results, including the profit margins, realized by APAM
and APIAM from non-fund businesses. The Trustees considered APAM's profit
margins in comparison to the limited industry data available and noted that the
profitability of any adviser was affected by numerous factors, including its
organizational structure and method for allocating expenses. The Trustees
concluded that APAM's profitability with respect to the management of the Fund
was not unreasonable.

Economies of Scale

The Trustees considered APAM's views relating to economies of scale in
connection with the Pioneer Funds as fund assets grow and the extent to which
any such economies of scale are shared with the Fund and Fund shareholders. The
Trustees noted the breakpoints in the management fee schedule. The Trustees
recognize that economies of scale are difficult to identify and quantify, and
that, among other factors that may be relevant, are the following: fee levels,
expense subsidization, investment by APAM in research and analytical
capabilities and APAM's commitment and resource allocation to the Fund. The
Trustees noted that profitability also may be an indicator of the availability
of any economies of scale, although profitability may vary for other reasons
including due to reductions in expenses. The Trustees concluded that economies
of scale, if any, were being appropriately shared with the Fund.

Other Benefits

The Trustees considered the other benefits that APAM enjoys from its
relationship with the Fund. The Trustees considered the character and amount of
fees paid or to be paid by the Fund, other than under the investment management
agreement, for services provided by APAM and its affiliates. The Trustees
further considered the revenues and profitability of APAM's businesses other
than the Fund business. To the extent applicable, the Trustees also considered
the benefits to the Fund and to APAM and its affiliates from the use of "soft"
commission dollars generated by the Fund to pay for research and brokerage
services.

                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 51



The Trustees considered that Amundi Pioneer is the principal U.S. asset
management business of Amundi, which is one of the largest asset managers
globally. Amundi's worldwide asset management business manages over $1.7
trillion in assets (including the Pioneer Funds). The Trustees considered
that APAM's relationship with Amundi creates potential opportunities for APAM,
APIAM and Amundi that derive from APAM's relationships with the Fund, including
Amundi's ability to market the services of APAM globally. The Trustees noted
that APAM has access to additional research and portfolio management
capabilities as a result of its relationship with Amundi and Amundi's enhanced
global presence that may contribute to an increase in the resources available
to APAM. The Trustees considered that APAM and the Fund receive reciprocal
intangible benefits from the relationship, including mutual brand recognition
and, for the Fund, direct and indirect access to the resources of a large
global asset manager. The Trustees concluded that any such benefits received by
APAM as a result of its relationship with the Fund were reasonable.

Conclusion

After consideration of the factors described above as well as other factors,
the Trustees, including the Independent Trustees, concluded that the investment
management agreement for the Fund, including the fees payable thereunder, was
fair and reasonable and voted to approve the proposed renewal of the investment
management agreement.

52 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



Trustees, Officers and Service Providers

Investment Adviser
Amundi Pioneer Asset Management, Inc.

Custodian and Sub-Administrator
Brown Brothers Harriman & Co.

Independent Registered Public Accounting Firm
Ernst & Young LLP

Principal Underwriter
Amundi Pioneer Distributor, Inc.

Legal Counsel
Morgan, Lewis & Bockius LLP

Shareowner Services and Transfer Agent
DST Asset Manager Solutions, Inc.

Proxy Voting Policies and Procedures of the Fund are available without charge,
upon request, by calling our toll free number (1-800-225-6292). Information
regarding how the Fund voted proxies relating to portfolio securities during
the most recent 12-month period ended June 30 is publicly available to
shareowners at www.amundipioneer.com. This information is also available on the
Securities and Exchange Commission's web site at www.sec.gov.

Trustees and Officers

The Fund's Trustees and officers are listed below, together with their
principal occupations and other directorships they have held during at least
the past five years. Trustees who are interested persons of the Fund within the
meaning of the 1940 Act are referred to as Interested Trustees. Trustees who
are not interested persons of the Fund are referred to as Independent Trustees.
Each of the Trustees serves as a Trustee of each of the 43 U.S. registered
investment portfolios for which Amundi Pioneer serves as investment adviser
(the "Pioneer Funds"). The address for all Trustees and all officers of the
Fund is 60 State Street, Boston, Massachusetts 02109.

The Statement of Additional Information of the Fund includes additional
information about the Trustees and is available, without charge, upon request,
by calling 1-800-225-6292.

                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 53




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 2013 - present);  Director, Broadridge Financial
Chairman of the Board       Serves until a        Chairman (2008 - 2013) and Chief Executive          Solutions, Inc. (investor
and Trustee                 successor trustee     Officer (2008 - 2012), Quadriserv, Inc.             communications and securities
                            is elected or         (technology products for securities lending         processing provider for
                            earlier retirement    industry); and Senior Executive Vice President,     financial services industry)
                            or removal.           The Bank of New York (financial and securities      (2009 - present); Director,
                                                  services) (1986 - 2004)                             Quadriserv, Inc. (2005 -
                                                                                                      2013); and Commissioner, New
                                                                                                      Jersey State Civil Service
                                                                                                      Commission (2011 - 2015)
------------------------------------------------------------------------------------------------------------------------------------
David R. Bock (74)          Trustee since 2005.   Managing Partner, Federal City Capital Advisors     Director of New York Mortgage
Trustee                     Serves until a        (corporate advisory services company) (1997 - 2004  Trust (publicly-traded
                            successor trustee     and 2008 - present); Interim Chief Executive        mortgage REIT) 2004 - 2009,
                            is elected or         Officer, Oxford Analytica, Inc. (privately held     2012 - present); Director
                            earlier retirement    research and consulting company) (2010); Executive  (of The Swiss Helvetia Fund,
                            or removal.           Vice President and Chief Financial Officer,         Inc. (closed-end fund) (2010 -
                                                  I-trax, Inc. (publicly traded health care services  2017); Director of Oxford
                                                  company) (2004 - 2007); and Executive Vice          Analytica, Inc. (2008 - 2015);
                                                  President and Chief Financial Officer, Pedestal     and Director of Enterprise
                                                  Inc. (internet-based mortgage trading company)      Community Investment, Inc.
                                                  (2000 - 2002); Private Consultant (1995 - 1997);    (privately-held affordable
                                                  Managing Director, Lehman Brothers (1992 - 1995);   housing finance company)
                                                  and Executive, The World Bank (1979 - 1992)         (1985 - 2010)
------------------------------------------------------------------------------------------------------------------------------------
Benjamin M. Friedman (74)   Trustee since 2008.   William Joseph Maier Professor of Political         Trustee, Mellon Institutional
Trustee                     Serves until a        Economy, Harvard University (1972 - present)        Funds Investment Trust and
                            successor trustee                                                         Mellon Institutional Funds
                            is elected or                                                             Master Portfolio (oversaw 17
                            earlier retirement                                                        portfolios in fund complex)
                            or removal.                                                               (1989 - 2008)
------------------------------------------------------------------------------------------------------------------------------------


54 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18




------------------------------------------------------------------------------------------------------------------------------------
Name, Age and Position      Term of Office and                                                        Other Directorships
Held With the Fund          Length of Service     Principal Occupation                                Held by Trustee
------------------------------------------------------------------------------------------------------------------------------------
                                                                                             
Margaret B.W. Graham (71)   Trustee since 2004.   Founding Director, Vice-President and Corporate     None
Trustee                     Serves until a        Secretary, The Winthrop  Group, Inc. (consulting
                            successor trustee     firm) (1982 - present); Desautels Faculty of
                            is elected or         Management, McGill University (1999 - 2017);
                            earlier retirement    and Manager of Research Operations and
                            or removal.           Organizational Learning, Xerox PARC, Xerox's
                                                  advance research center (1990-1994)
------------------------------------------------------------------------------------------------------------------------------------
Lorraine H. Monchak (62)    Trustee since 2017.   (Advisory Chief Investment Officer, 1199 SEIU       None
Trustee                     Trustee from 2014 -   Funds (healthcare workers union pension funds)
                            2017) Serves until a  (2001 - present); Vice President - International
                            successor trustee is  Investments Group, American International Group,
                            elected or earlier    Inc. (insurance company) (1993 - 2001); Vice
                            retirement or         President - Corporate Finance and Treasury Group,
                            removal.              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 (70)    Trustee since 2004.   President and Chief Executive Officer, Newbury      Director of New America High
Trustee                     Serves until a        Piret Company (investment banking firm) (1981 -     Income Fund, Inc. (closed-end
                            successor trustee     present)                                            investment company) (2004 -
                            is elected or                                                             present); and Member, Board
                            earlier retirement                                                        of Governors, Investment
                            or removal.                                                               Company Institute (2000 -
                                                                                                      2006)
------------------------------------------------------------------------------------------------------------------------------------
Fred J. Ricciardi (71)      Trustee since 2014.   Consultant (investment company services) (2012 -    None
Trustee                     Serves until a        present); Executive Vice President, BNY Mellon
                            successor trustee     (financial and investment company services)
                            is elected or         (1969 - 2012); Director, BNY International
                            earlier retirement    Financing Corp. (financial services) (2002 -
                            or removal.           2012); and Director, Mellon Overseas Investment
                                                  Corp. (financial services) (2009 - 2012)
------------------------------------------------------------------------------------------------------------------------------------


                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 55




Interested Trustees


------------------------------------------------------------------------------------------------------------------------------------
Name, Age and Position      Term of Office and                                                        Other Directorships
Held With the Fund          Length of Service     Principal Occupation                                Held by Trustee
------------------------------------------------------------------------------------------------------------------------------------
                                                                                             
Lisa M. Jones (56)*         Trustee since 2017.   Director, CEO and President of Amundi Pioneer       None
Trustee, President and      Serves until a        Asset Management USA, Inc. (since September 2014);
Chief Executive Officer     successor trustee     Director, CEO and President of Amundi Pioneer
                            is elected or         Asset Management, Inc. (since September 2014);
                            earlier retirement    Director, CEO and President of Amundi Pioneer
                            or removal            Distributor, Inc. (since September 2014);
                                                  Director, CEO and President of Amundi Pioneer
                                                  Institutional Asset Management, Inc. (since
                                                  September 2014); Chair, Amundi Pioneer Asset
                                                  Management USA, Inc., Amundi Pioneer Distributor,
                                                  Inc. and Amundi Pioneer Institutional Asset
                                                  Management, Inc. (September 2014 - 2018); Managing
                                                  Director, Morgan Stanley Investment Management
                                                  (2010 - 2013); and Director of Institutional
                                                  Business, CEO of International, Eaton Vance
                                                  Management (2005 - 2010)
------------------------------------------------------------------------------------------------------------------------------------
Kenneth J. Taubes (60)*     Trustee since 2014.   Director and Executive Vice President (since 2008)  None
Trustee                     Serves until a        and Chief Investment Officer, U.S. (since 2010) of
                            successor trustee     Amundi Pioneer Asset Management USA, Inc.;
                            is elected or         Executive Vice President and Chief Investment
                            earlier retirement    Officer, U.S. of Amundi Pioneer (since 2008);
                            or removal            Executive Vice President of Amundi Pioneer
                                                  Institutional Asset Management, Inc. (since 2009);
                                                  and Portfolio Manager of Amundi Pioneer
                                                  (since 1999)
------------------------------------------------------------------------------------------------------------------------------------
 * Ms. Jones and Mr. Taubes are Interested Trustees because they are officers or
   directors of the Fund's investment adviser and certain of its affiliates.


56 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18




Fund Officers


------------------------------------------------------------------------------------------------------------------------------------
Name, Age and Position      Term of Office and                                                        Other Directorships
Held With the Fund          Length of Service     Principal Occupation                                Held by Officer
------------------------------------------------------------------------------------------------------------------------------------
                                                                                             
Christopher J. Kelley (53)  Since 2004. Serves    Vice President and Associate General Counsel of     None
Secretary and Chief         at the discretion     Amundi Pioneer since January 2008; Secretary and
Legal Officer               of the Board          Chief Legal Officer of all of the Pioneer Funds
                                                  since June 2010; Assistant Secretary of all of the
                                                  Pioneer Funds from September 2003 to May 2010; and
                                                  Vice President and Senior Counsel of Amundi
                                                  Pioneer from July 2002 to December 2007
------------------------------------------------------------------------------------------------------------------------------------
Carol B. Hannigan (57)      Since 2010. Serves    Fund Governance Director of Amundi Pioneer since    None
Assistant Secretary         at the discretion     December 2006 and Assistant Secretary of all the
                            of the Board          Pioneer Funds since June 2010; Manager - Fund
                                                  Governance of Amundi Pioneer from December 2003
                                                  to November 2006; and Senior Paralegal of Amundi
                                                  Pioneer from January 2000 to November 2003
------------------------------------------------------------------------------------------------------------------------------------
Thomas Reyes (56)           Since 2010. Serves    Senior Counsel of Amundi Pioneer since May 2013     None
Assistant Secretary         at the discretion     and Assistant Secretary of all the Pioneer Funds
                            of the Board          since June 2010; and Counsel of Amundi Pioneer
                                                  from June 2007 to May 2013
------------------------------------------------------------------------------------------------------------------------------------
Mark E. Bradley (59)        Since 2008. Serves    Vice President - Fund Treasury of Amundi Pioneer;   None
Treasurer and Chief         at the discretion     Treasurer of all of the Pioneer Funds since March
Financial and               of the Board          2008; Deputy Treasurer of Amundi Pioneer from
Accounting Officer                                March 2004 to February 2008; and Assistant
                                                  Treasurer of all of the Pioneer Funds from
                                                  March 2004 to February 2008
------------------------------------------------------------------------------------------------------------------------------------
Luis I. Presutti (53)       Since 2004. Serves    Director - Fund Treasury of Amundi Pioneer; and     None
Assistant Treasurer         at the discretion     Assistant Treasurer of all of the Pioneer Funds
                            of the Board
------------------------------------------------------------------------------------------------------------------------------------
Gary Sullivan (60)          Since 2004. Serves    Senior Manager - Fund Treasury of Amundi Pioneer;   None
Assistant Treasurer         at the discretion     and Assistant Treasurer of all of the Pioneer
                            of the Board          Funds
------------------------------------------------------------------------------------------------------------------------------------


                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 57




Fund Officers (continued)

------------------------------------------------------------------------------------------------------------------------------------
Name, Age and Position      Term of Office and                                                        Other Directorships
Held With the Fund          Length of Service     Principal Occupation                                Held by Officer
------------------------------------------------------------------------------------------------------------------------------------
                                                                                             
David F. Johnson (39)       Since 2009. Serves    Senior Manager - Fund Treasury of Amundi Pioneer    None
Assistant Treasurer         at the discretion     since November 2008; Assistant Treasurer of all of
                            of the Board          the Pioneer Funds since January 2009; and Client
                                                  Service Manager - Institutional Investor Services
                                                  at State Street Bank from March 2003 to March 2007
------------------------------------------------------------------------------------------------------------------------------------
John Malone (48)            Since 2018. Serves    Managing Director, Chief Compliance Officer of      None
Chief Compliance Officer    at the discretion     Amundi Pioneer Asset Management; Amundi Pioneer
                            of the Board          Institutional Asset Management, Inc.; and the
                                                  Pioneer Funds since September 2018; and Chief
                                                  Compliance Officer of Amundi Pioneer Distributor,
                                                  Inc. since January 2014.
------------------------------------------------------------------------------------------------------------------------------------
Kelly O'Donnell (47)        Since 2006. Serves    Vice President - Investor Services Group of Amundi  None
Anti-Money Laundering       at the discretion     Pioneer and Anti-Money Laundering Officer of all
Officer                     of the Board          the Pioneer Funds since 2006
------------------------------------------------------------------------------------------------------------------------------------


58 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



                          This page is for your notes.

                Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18 59



                          This page is for your notes.

60 Pioneer Select Mid Cap Growth Fund | Annual Report | 11/30/18



How to Contact Amundi Pioneer

We are pleased to offer a variety of convenient ways for you to contact us for
assistance or information.

Call us for:
--------------------------------------------------------------------------------
Account Information, including existing accounts,
new accounts, prospectuses, applications
and service forms                                                 1-800-225-6292

FactFoneSM for automated fund yields, prices,
account information and transactions                              1-800-225-4321

Retirement plans information                                      1-800-622-0176

Write to us:
--------------------------------------------------------------------------------
Amundi Pioneer
P.O. Box 55014
Boston, Massachusetts 02205-5014

Our toll-free fax                                                 1-800-225-4240

Our internet e-mail address                us.askamundipioneer@amundipioneer.com
(for general questions about Amundi Pioneer only)

Visit our web site: www.amundipioneer.com

This report must be preceded or accompanied by a prospectus.

The Fund files a complete schedule of investments with the Securities and
Exchange Commission for the first and third quarters for each fiscal year on
Form N-Q. Shareholders may view the filed Form N-Q by visiting the Commission's
web site at https://www.sec.gov.



[LOGO]   Amundi Pioneer
         ==============
       ASSET MANAGEMENT

Amundi Pioneer Asset Management, Inc.
60 State Street
Boston, MA 02109
www.amundipioneer.com

Securities offered through Amundi Pioneer Distributor, Inc.
60 State Street, Boston, MA 02109
Underwriter of Pioneer Mutual Funds, Member SIPC
[C] 2019 Amundi Pioneer Asset Management 23474-09-0119



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.

Pioneer Series Trust II:
The audit fees for the Trust were $23,000
payable to Ernst & Young LLP for the year ended
November 30, 2018 and $23,000
for the year ended November 30, 2017.


(b) Disclose, under the caption AUDIT-RELATED FEES, the aggregate fees billed in
each of the last two fiscal years for assurance and related services by the
principal accountant that are reasonably related to the performance of the audit
of the registrant's financial statements and are not reported under
paragraph (a) of this Item. Registrants shall describe the nature of the
services comprising the fees disclosed under this category.

There were no audit-related services in 2018 or 2017.


(c) Disclose, under the caption TAX FEES, the aggregate fees billed in each of
the last two fiscal years for professional services rendered by the principal
accountant for tax compliance, tax advice, and tax planning. Registrants shall
describe the nature of the services comprising the fees disclosed under this
category.


Pioneer Series Trust II:
The tax fees for the Trust were $8,028
payable to Ernst & Young LLP for the year ended
November 30, 2018 and $8,028
for the year ended November 30, 2017.


(d) Disclose, under the caption ALL OTHER FEES, the aggregate fees billed in
each of the last two fiscal years for products and services provided by the
principal accountant, other than the services reported in paragraphs (a) through
(c) of this Item. Registrants shall describe the nature of the services
comprising the fees disclosed under this category.

There were no other fees in 2018 or 2017.


(e) (1) Disclose the audit committee's pre-approval policies and procedures
described in paragraph (c)(7) of Rule 2-01 of Regulation S-X.

 PIONEER FUNDS
            APPROVAL OF AUDIT, AUDIT-RELATED, TAX AND OTHER SERVICES
                       PROVIDED BY THE INDEPENDENT AUDITOR

                  SECTION I - POLICY PURPOSE AND APPLICABILITY

The Pioneer Funds recognize the importance of maintaining the independence of
their outside auditors. Maintaining independence is a shared responsibility
involving Amudi Pioneer Asset Management, Inc, the audit committee and
the independent auditors.

The Funds recognize that a Fund's independent auditors: 1) possess knowledge of
the Funds, 2) are able to incorporate certain services into the scope of the
audit, thereby avoiding redundant work, cost and disruption of Fund personnel
and processes, and 3) have expertise that has value to the Funds. As a result,
there are situations where it is desirable to use the Fund's independent
auditors for services in addition to the annual audit and where the potential
for conflicts of interests are minimal. Consequently, this policy, which is
intended to comply with Rule 210.2-01(C)(7), sets forth guidelines and
procedures to be followed by the Funds when retaining the independent audit firm
to perform audit, audit-related tax and other services under those
circumstances, while also maintaining independence.

Approval of a service in accordance with this policy for a Fund shall also
constitute approval for any other Fund whose pre-approval is required pursuant
to Rule 210.2-01(c)(7)(ii).

In addition to the procedures set forth in this policy, any non-audit services
that may be provided consistently with Rule 210.2-01 may be approved by the
Audit Committee itself and any pre-approval that may be waived in accordance
with Rule 210.2-01(c)(7)(i)(C) is hereby waived.

Selection of a Fund's independent auditors and their compensation shall be
determined by the Audit Committee and shall not be subject to this policy.



                               SECTION II - POLICY

---------------- -------------------------------- -------------------------------------------------
SERVICE           SERVICE CATEGORY DESCRIPTION      SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES
CATEGORY
---------------- -------------------------------- -------------------------------------------------
                                            
I.  AUDIT        Services that are directly       o Accounting research assistance
SERVICES         related to performing the        o SEC consultation, registration
                 independent audit of the Funds     statements, and reporting
                                                  o Tax accrual related matters
                                                  o Implementation of new accounting
                                                    standards
                                                  o Compliance letters (e.g. rating agency
                                                    letters)
                                                  o Regulatory reviews and assistance
                                                    regarding financial matters
                                                  o Semi-annual reviews (if requested)
                                                  o Comfort letters for closed end
                                                    offerings
---------------- -------------------------------- -------------------------------------------------
II.              Services which are not           o AICPA attest and agreed-upon procedures
AUDIT-RELATED    prohibited under Rule            o Technology control assessments
SERVICES         210.2-01(C)(4) (the "Rule")      o Financial reporting control assessments
                 and are related extensions of    o Enterprise security architecture
                 the audit services support the     assessment
                 audit, or use the
                 knowledge/expertise gained
                 from the audit procedures as a
                 foundation to complete the
                 project.  In most cases, if
                 the Audit-Related Services are
                 not performed by the Audit
                 firm, the scope of the Audit
                 Services would likely
                 increase.  The Services are
                 typically well-defined and
                 governed by accounting
                 professional standards (AICPA,
                 SEC, etc.)
---------------- -------------------------------- -------------------------------------------------

 ------------------------------------- ------------------------------------
                                    
   AUDIT COMMITTEE APPROVAL POLICY               AUDIT COMMITTEE
                                                REPORTING POLICY
 ------------------------------------- ------------------------------------
                                    
 o "One-time" pre-approval             o A summary of all such
   for the audit period for all          services and related fees
   pre-approved specific service         reported at each regularly
   subcategories.  Approval of the       scheduled Audit Committee
   independent auditors as               meeting.
   auditors for a Fund shall
   constitute pre approval for
   these services.
 ------------------------------------- ------------------------------------
 o "One-time" pre-approval             o A summary of all such
   for the fund fiscal year within       services and related fees
   a specified dollar limit              (including comparison to
   for all pre-approved                  specified dollar limits)
   specific service subcategories        reported quarterly.

 o Specific approval is
   needed to exceed the
   pre-approved dollar limit for
   these services (see general
   Audit Committee approval policy
   below for details on obtaining
   specific approvals)

 o Specific approval is
   needed to use the Fund's
   auditors for Audit-Related
   Services not denoted as
   "pre-approved", or
   to add a specific service
   subcategory as "pre-approved"
 ------------------------------------- ------------------------------------




                     SECTION III - POLICY DETAIL, CONTINUED

----------------------- --------------------------- -----------------------------------------------
   SERVICE CATEGORY          SERVICE CATEGORY        SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES
                               DESCRIPTION
----------------------- --------------------------- -----------------------------------------------
                                              
III. TAX SERVICES       Services which are not      o Tax planning and support
                        prohibited by the Rule,     o Tax controversy assistance
                        if an officer of the Fund   o Tax compliance, tax returns, excise
                        determines that using the     tax returns and support
                        Fund's auditor to provide   o Tax opinions
                        these services creates
                        significant synergy in
                        the form of efficiency,
                        minimized disruption, or
                        the ability to maintain a
                        desired level of
                        confidentiality.
----------------------- --------------------------- -----------------------------------------------

------------------------------------- -------------------------
  AUDIT COMMITTEE APPROVAL POLICY         AUDIT COMMITTEE
                                          REPORTING POLICY
------------------------------------- -------------------------
------------------------------------- -------------------------
o "One-time" pre-approval             o A summary of
  for the fund fiscal  year             all such services and
  within a specified dollar limit       related fees
  				        (including comparison
  			                to specified dollar
  			                limits) reported
  			                quarterly.

o Specific approval is
  needed to exceed the
  pre-approved dollar limits for
  these services (see general
  Audit Committee approval policy
  below for details on obtaining
  specific approvals)

o Specific approval is
  needed to use the Fund's
  auditors for tax services not
  denoted as pre-approved, or to add a specific
  service subcategory as
  "pre-approved"
------------------------------------- -------------------------




                     SECTION III - POLICY DETAIL, CONTINUED

----------------------- --------------------------- -----------------------------------------------
   SERVICE CATEGORY          SERVICE CATEGORY        SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES
                               DESCRIPTION
----------------------- --------------------------- -----------------------------------------------
                                              
IV.  OTHER SERVICES     Services which are not      o Business Risk Management support
                        prohibited by the Rule,     o Other control and regulatory
A. SYNERGISTIC,         if an officer of the Fund     compliance projects
UNIQUE QUALIFICATIONS   determines that using the
                        Fund's auditor to provide
                        these services creates
                        significant synergy in
                        the form of efficiency,
                        minimized disruption,
                        the ability to maintain a
                        desired level of
                        confidentiality, or where
                        the Fund's auditors
                        posses unique or superior
                        qualifications to provide
                        these services, resulting
                        in superior value and
                        results for the Fund.
----------------------- --------------------------- -----------------------------------------------

--------------------------------------- ------------------------
    AUDIT COMMITTEE APPROVAL POLICY         AUDIT COMMITTEE
                                            REPORTING POLICY
------------------------------------- --------------------------
                                   
o "One-time" pre-approval             o A summary of
  for the fund fiscal year within       all such services and
  a specified dollar limit              related fees
  			               (including comparison
  			                to specified dollar
  				        limits) reported
                                        quarterly.
o Specific approval is
  needed to exceed the
  pre-approved dollar limits for
  these services (see general
  Audit Committee approval policy
  below for details on obtaining
  specific approvals)

o Specific approval is
  needed to use the Fund's
  auditors for "Synergistic" or
  "Unique Qualifications" Other
  Services not denoted as
  pre-approved to the left, or to
  add a specific service
  subcategory as "pre-approved"
------------------------------------- --------------------------




                     SECTION III - POLICY DETAIL, CONTINUED

----------------------- ------------------------- -----------------------------------------------
   SERVICE CATEGORY         SERVICE CATEGORY        SPECIFIC PROHIBITED SERVICE SUBCATEGORIES
                              DESCRIPTION
----------------------- ------------------------- -----------------------------------------------
                                            
PROHIBITED  SERVICES    Services which result     1. Bookkeeping or other services
                        in the auditors losing       related to the accounting records or
                        independence status          financial statements of the audit
                        under the Rule.              client*
                                                  2. Financial information systems design
                                                     and implementation*
                                                  3. Appraisal or valuation services,
                                                     fairness* opinions, or
                                                     contribution-in-kind reports
                                                  4. Actuarial services (i.e., setting
                                                     actuarial reserves versus actuarial
                                                     audit work)*
                                                  5. Internal audit outsourcing services*
                                                  6. Management functions or human
                                                     resources
                                                  7. Broker or dealer, investment
                                                     advisor, or investment banking services
                                                  8. Legal services and expert services
                                                     unrelated to the audit
                                                  9. Any other service that the Public
                                                     Company Accounting Oversight Board
                                                     determines, by regulation, is
                                                     impermissible
----------------------- ------------------------- -----------------------------------------------

------------------------------------------- ------------------------------
     AUDIT COMMITTEE APPROVAL POLICY               AUDIT COMMITTEE
                                                  REPORTING POLICY
------------------------------------------- ------------------------------
o These services are not to be              o A summary of all
  performed with the exception of the(*)      services and related
  services that may be permitted              fees reported at each
  if they would not be subject to audit       regularly scheduled
  procedures at the audit client (as          Audit Committee meeting
  defined in rule 2-01(f)(4)) level           will serve as continual
  the firm providing the service.             confirmation that has
  				              not provided any
                                              restricted services.
------------------------------------------- ------------------------------

--------------------------------------------------------------------------------
GENERAL AUDIT COMMITTEE APPROVAL POLICY:
o For all projects, the officers of the Funds and the Fund's auditors will each
  make an assessment to determine that any proposed projects will not impair
  independence.

o Potential services will be classified into the four non-restricted service
  categories and the "Approval of Audit, Audit-Related, Tax and Other
  Services" Policy above will be applied. Any services outside the specific
  pre-approved service subcategories set forth above must be specifically
  approved by the Audit Committee.

o At least quarterly, the Audit Committee shall review a report summarizing the
  services by service category, including fees, provided by the Audit firm as
  set forth in the above policy.

--------------------------------------------------------------------------------


    (2) Disclose the percentage of services described in each of paragraphs (b)
   through (d) of this Item that were approved by the audit committee pursuant
   to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X.

Non-Audit Services
Beginning with non-audit service contracts entered
into on or after May 6, 2003, the effective date of the
new SEC pre-approval rules, the Trust's audit
committee is required to pre-approve services to
affiliates defined by SEC rules to the extent that the
services are determined to have a direct impact on the
operations or financial reporting of the Trust.  For the
years ended November 30 2018 and 2017, there were no
services provided to an affiliate that required the
Trust's audit committee pre-approval.



(f) If greater than 50 percent, disclose the percentage of hours expended on the
principal accountants engagement to audit the registrant's financial statements
for the most recent fiscal year that were attributed to work performed by
persons other than the principal accountant's full-time, permanent employees.

N/A

(g) Disclose the aggregate non-audit fees billed by the registrants accountant
for services rendered to the registrant, and rendered to the registrants
investment adviser (not including any sub-adviser whose role is primarily
portfolio management and is subcontracted with or overseen by another investment
adviser), and any entity controlling, controlled by, or under common control
with the adviser that provides ongoing services to the registrant for each of
the last two fiscal years of the registrant.


The aggregate non-audit fees for the Trust were $8,028
payable to Ernst & Young LLP for the year ended
November 30, 2018 and $8,028 for the year
ended November 30, 2017.


(h) Disclose whether the registrants audit committee of the board of trustees
has considered whether the provision of non-audit services that were rendered to
the registrants investment adviser (not including any subadviser whose role is
primarily portfolio management and is subcontracted with or overseen by another
investment adviser), and any entity controlling, controlled by, or under common
control with the investment adviser that provides ongoing services to the
registrant that were not pre-approved pursuant to paragraph (c)(7)(ii) of
Rule 2-01 of Regulation S-X is compatible with maintaining the principal
accountant's independence.

The Fund's audit committee of the Board of Trustees
has considered whether the provision of non-audit
services that were rendered to the Affiliates (as
defined) that were not pre- approved pursuant to
paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is
compatible with maintaining the principal accountant's
independence.

ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS

(a) If the registrant is a listed issuer as defined in Rule 10A-3
under the Exchange Act (17 CFR 240.10A-3), state whether
or not the registrant has a separately-designated standing
 audit committee established in accordance with Section
3(a)(58)(A) of the Exchange Act (15 U.S.C. 78c(a)(58)(A)).
If the registrant has such a committee, however designated,
identify each committee member. If the entire board of directors
is acting as the registrant's audit committee as specified in
Section 3(a)(58)(B) of the Exchange Act (15 U.S.C. 78c(a)(58)(B)),
so state.

N/A

(b) If applicable, provide the disclosure required by Rule 10A-3(d)
under the Exchange Act (17 CFR 240.10A-3(d)) regarding an exemption
from the listing standards for audit committees.

N/A

ITEM 6. SCHEDULE OF INVESTMENTS.

File Schedule of Investments in securities of unaffiliated issuers
as of the close of the reporting period as set forth in 210.1212
of Regulation S-X [17 CFR 210.12-12], unless the schedule is
included as part of the report to shareholders filed under Item
1 of this Form.

Included in Item 1


ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR
CLOSED-END MANAGEMENT INVESTMENT COMPANIES.

A closed-end management investment company that is filing an annual report on
this Form N-CSR must, unless it invests exclusively in non-voting securities,
describe the policies and procedures that it uses to determine how to vote
proxies relating to portfolio securities, including the procedures that the
company uses when a vote presents a conflict between the interests of its
shareholders, on the one hand, and those of the company's investment adviser;
principal underwriter; or any affiliated person (as defined in Section 2(a)(3)
of the Investment Company Act of 1940 (15 U.S.C. 80a-2(a)(3)) and the rules
thereunder) of the company, its investment adviser, or its principal
underwriter, on the other. Include any policies and procedures of the company's
investment adviser, or any other third party, that the company uses, or that are
used on the company's behalf, to determine how to vote proxies relating to
portfolio securities.

Not applicable to open-end management investment companies.



ITEM 8. PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES.

(a) If the registrant is a closed-end management investment company that
is filing an annual report on this Form N-CSR,provide the following
information:
(1) State the name, title, and length of service of the person or persons
employed by or associated with the registrant or an investment adviser
of the registrant who are primarily responsible for the day-to-day management
of the registrant's portfolio ("Portfolio Manager"). Also state each Portfolio
Manager's business experience during the past 5 years.


Not applicable to open-end management investment companies.


ITEM 9. PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT
INVESTMENT COMPANY AND AFFILIATED PURCHASERS.

(a) If the registrant is a closed-end management investment company,
in the following tabular format, provide the information specified in
paragraph (b) of this Item with respect to any purchase made by or on
behalf of the registrant or any affiliated purchaser, as defined in
Rule 10b-18(a)(3) under the Exchange Act (17 CFR 240.10b-18(a)(3)), of
shares or other units of any class of the registrant's equity securities
that is registered by the registrant pursuant to Section 12 of the
Exchange Act (15 U.S.C. 781).

Not applicable to open-end management investment companies.


ITEM 10. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

Describe any material changes to the procedures by which shareholders
may recommend nominees to the registrant's board of directors, where
those changes were implemented after the registrant last provided
disclosure in response to the requirements of Item 407(c)(2)(iv) of
Regulation S-R(17 CFR 229.407)(as required by Item 22(b)(15))
of Schedule 14A (17 CFR 240.14a-101), or this Item.


There have been no material changes to the procedures by which the
shareholders may recommend nominees to the registrant's board of
directors since the registrant last provided disclosure in response
to the requirements of Item 407(c)(2)(iv) of Regulation S-R of Schedule 14(A)
in its definitive proxy statement, or this item.


ITEM 11. CONTROLS AND PROCEDURES.

(a) Disclose the conclusions of the registrant's principal executive and
principal financials officers, or persons performing similar functions,
regarding the effectiveness of the registrant's disclosure
controls and procedures (as defined in Rule 30a-3(c) under the Act (17 CFR
270.30a-3(c))) as of a date within 90 days of the filing date of the report
that includes the disclosure required by this paragraph,
based on the evaluation of these controls and procedures required by Rule
30a-3(b) under the Act (17 CFR 270.30(a)-3(b) and Rules 13a-15(b) or 15d-15(b)
under the Exchange Act (17 CFR 240.13a-15(b) or 240.15d-15(b)).

The registrant's principal executive officer
and principal financial officer have
concluded that the registrant's disclosure
controls and procedures are effective based
on the evaluation of these controls and
procedures as of a date within 90 days of the
filing date of this report.


(b) Disclose any change in the registrant's internal control over financial
reporting (as defined in Rule 30a-3(d) under the Act (17CFR 270.30a-3(d)) that
occured during the second fiscal quarter of the period covered by this report
that has materially affected, or is reasonably likely to materially affect,
the registrant's internal control over financial reporting.

There were no significant changes in the
registrant's internal control over financial
reporting that occurred during the second
fiscal quarter of the period covered by this
report that have materially affected, or are
reasonably likely to materially affect, the
registrant's internal control over financial
reporting.

The registrant's principal executive officer and principal financial
officer, however, voluntarily are reporting the following information:

In August of 2006 the registrant's investment adviser
enhanced its internal procedures for reporting performance
information required to be included in prospectuses.
Those enhancements involved additional internal controls
over the appropriateness of performance data
generated for this purpose.  Such enhancements were made
following an internal review which identified
prospectuses relating to certain classes of shares of
a limited number of registrants where, inadvertently,
performance information not reflecting the deduction of
applicable sales charges was included. Those prospectuses
were revised, and the revised prospectuses were distributed to
shareholders.

Item 12. Disclosure of Securities Lending Activities for Closed-End
Management Investment Companies.

(a) If the registrant is a closed-end management investment company,
provide the following dollar amounts of income and compensation related
to the securities lending activities of the registrant during its most
recent fiscal year:

N/A

(1) Gross income from securities lending activities;

N/A

(2) All fees and/or compensation for each of the following securities
lending activities and related services: any share of revenue generated
by the securities lending program paid to the securities lending agent(s)
(revenue split); fees paid for cash collateral management services
(including fees deducted from a pooled cash collateral reinvestment
vehicle) that are not included in the revenue split; administrative
fees that are not included in the revenue split; fees for
indemnification that are not included in the revenue split; rebates
paid to borrowers; and any other fees relating to the securities lending
program that are not included in the revenue split, including a description
of those other fees;

N/A

(3) The aggregate fees/compensation disclosed pursuant to paragraph (2); and

N/A

(4) Net income from securities lending activities (i.e., the dollar amount in
paragraph (1) minus the dollar amount in paragraph (3)).

If a fee for a service is included in the revenue split, state that the fee
is included in the revenue split.

N/A

(b) If the registrant is a closed-end management investment company, describe
the services provided to the registrant by the securities lending agent in
the registrants most recent fiscal year.

N/A


ITEM 13. EXHIBITS.

(a) File the exhibits listed below as part of this Form. Letter or number the
exhibits in the sequence indicated.

(1) Any code of ethics, or amendment thereto, that is the subject of the
disclosure required by Item 2, to the extent that the registrant intends to
satisfy the Item 2 requirements through filing of an exhibit.



(2) A separate certification for each principal executive officer and principal
financial officer of the registrant as required by Rule 30a-2(a) under the Act
(17 CFR 270.30a-2(a)) , exactly as set forth below:

Filed herewith.





                                   SIGNATURES

                          [See General Instruction F]


Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment Company Act of 1940, the registrant has duly caused this report to be
signed on its behalf by the undersigned, thereunto duly authorized.


(Registrant) Pioneer Series Trust II


By (Signature and Title)* /s/ Lisa M. Jones
Lisa M. Jones, President & Chief Executive Officer

Date January 30, 2019


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 30, 2019


By (Signature and Title)* /s/ Mark E. Bradley
Mark E. Bradley, Treasurer & Chief Accounting & Financial Officer


Date January 30, 2019

* Print the name and title of each signing officer under his or her signature.