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 811-21664

                         Pioneer Series Trust III
               (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:  August 31


Date of reporting period:  September 1, 2018 through February 28, 2019


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

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


ITEM 1. REPORTS TO STOCKHOLDERS.



                              Pioneer Disciplined
                              Value Fund

--------------------------------------------------------------------------------
                              Semiannual Report | February 28, 2019
--------------------------------------------------------------------------------

                              Ticker Symbols:

                              Class A   CVFCX
                              Class C   CVCFX
                              Class R   CVRFX
                              Class Y   CVFYX

Beginning in February 2021, as permitted by regulations adopted by the
Securities and Exchange Commission, paper copies of the Fund's shareholder
reports like this one will no longer be sent by mail, unless you specifically
request paper copies of the reports from the Fund or from your financial
intermediary, such as a broker-dealer, bank or insurance company. Instead, the
reports will be made available on the Fund's website, and you will be notified
by mail each time a report is posted and provided with a website link to access
the report.

If you already elected to receive shareholder reports electronically, you will
not be affected by this change and you need not take any action. You may elect
to receive shareholder reports and other communications electronically by
contacting your financial intermediary or, if you invest directly with the
Fund, by calling 1-800-225-6292.

You may elect to receive all future reports in paper free of charge. If you
invest directly with the Fund, you can inform the Fund that you wish to
continue receiving paper copies of your shareholder reports by calling
1-800-225-6292. If you invest through a financial intermediary, you can contact
your financial intermediary to request that you continue to receive paper
copies of your shareholder reports. Your election to receive reports in paper
will apply to all funds held in your account if you invest through your
financial intermediary or all funds held within the Pioneer Fund complex if you
invest directly.

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



                        visit us: www.amundipioneer.com



                                                                          
Table of Contents

President's Letter                                                            2

Portfolio Management Discussion                                               4

Portfolio Summary                                                            12

Prices and Distributions                                                     13

Performance Update                                                           14

Comparing Ongoing Fund Expenses                                              18

Schedule of Investments                                                      20


Financial Statements                                                         25

Notes to Financial Statements                                                33

Approval of Investment Management Agreement                                  41

Trustees, Officers and Service Providers                                     46


                  Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 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 Disciplined Value Fund | Semiannual Report | 2/28/19



We greatly appreciate the trust you have placed in us and look forward to
continuing to serve you in the future.

Sincerely,

/s/ Lisa M. Jones

Lisa M. Jones
Head of the Americas, President and CEO of U.S.
Amundi Pioneer Asset Management USA, Inc.
February 28, 2019

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

                  Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 3



Portfolio Management Discussion | 2/28/19

In the following interview, Craig Sterling and Asesh (Ace) Savla discuss the
factors that affected the performance of Pioneer Disciplined Value Fund during
the six-month period ended February 28, 2019. Mr. Sterling, Managing Director,
Director of Core Equity, Head of Equity Research, U.S., and a portfolio manager
at Amundi Pioneer Asset Management, Inc. ("Amundi Pioneer"), is responsible for
day-to-day management of the Fund's investment portfolio, along with Mr. Savla,
a vice president, Team Leader of U.S. Equity Quantitative Research, and a
portfolio manager at Amundi Pioneer.

Q     How did the Fund perform during the six-month period ended February 28,
      2019?

A     Pioneer Disciplined Value Fund's Class A shares returned -3.66% at net
      asset value during the six-month period ended February 28, 2019, while the
      Fund's benchmark, the Russell 1000 Value Index, returned -1.62%. During
      the same period, the average return of the 1,242 mutual funds in
      Morningstar's Large Value Funds category was -2.89%.

Q     How would you describe the investment environment in the equity market
      during the six-month period ended February 28, 2019?

A     The six-month period proved to be a volatile one for U.S. equities. The
      first couple months, August and September 2018, seemed to portend a
      continuation of the favorable market conditions we had witnessed for most
      of 2017 and the first half of 2018, as the Standard & Poor's 500 Index
      (the S&P 500) produced a year-to-date return of more than 10% through
      September 30, 2018, on the back of strong corporate earnings growth and
      favorable economic data.

      Conditions began to decline rapidly in October, however, as concerns over
      a fairly aggressive approach to the tightening of monetary policy by the
      U.S. Federal Reserve (the Fed), slowing economic growth in Europe and
      China, trade disputes between the U.S. and its key trading partners,
      especially China, lower oil prices, and numerous geopolitical issues
      rattled the markets. In light of those potential roadblocks, equities had
      a very rough fourth quarter of 2018, as the S&P 500 was down by more than
      13% for the quarter, including a December return of -9.03%, the S&P 500's
      worst December performance since the Great Depression.

4 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



      Along with the abrupt change of direction in the equity markets in the
      fourth quarter came a change in market leadership. Many of the cyclical
      and high-valuation stocks that helped push the markets higher for 2017 and
      much of 2018 were what drove the markets lower in the fourth quarter of
      2018, with cyclicals starting to turn downward in May and essentially
      crashing in December, while the high-valuation stocks suffered
      meaningfully in the last quarter. Market leadership, in turn, shifted to
      defensive stocks in sectors such as consumer staples, utilities, and
      health care. The Fund underperformed in the "risk-off" environment as we
      did not at the time, nor do we still, see a recession on the horizon,
      which was the market's primary concern towards the latter part of 2018.

      The final two months of the period, January and February 2019, saw the
      markets rally on several positive developments, including: the Fed's
      announcement -- after raising interest rates four times in 2018 -- that it
      was likely to take a more measured approach with regard to future rate
      increases; rising oil prices, which jumped from around $50 per barrel at
      the end of December to nearly $70 per barrel by the end of February; and
      news that China and the U.S. were engaged in talks aimed at potentially
      resolving their trade differences.

      For the full six-month period ended February 28, 2019, most major U.S.
      equity indices finished in negative territory. The S&P 500 returned -3.04%
      for the six-month period, while the Fund's benchmark, the Russell 1000
      Value Index (the Russell Index), returned -1.62%.

Q     Which of your investment decisions detracted from the Fund's
      benchmark-relative performance during the six-month period ended February
      28, 2019?

A     With regard to sector allocation, the Fund's overweight to industrials and
      underweights to health care, utilities, and real estate detracted from
      benchmark-relative performance. The overweight to industrials was due to
      the cyclical bias we maintained in the portfolio. Unfortunately, it became
      apparent as the period progressed that the U.S. economy was decelerating
      and that trade talks between the U.S. and China were not advancing as well
      as hoped, and so cyclical stocks -- or stocks geared towards how well (or
      poorly) the economy and markets are performing -- did not fare well. We
      continued to believe that a still-healthy U.S. consumer, a trade deal with

                  Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 5



      China, a favorable interest-rate environment, and China's monetary
      stimulus could all lead to sustained economic growth and, while the market
      disagreed with us in the short-term, our long-term view still holds.

      In a period that saw many of the sectors within the Russell Index post
      negative returns, health care managed to finish in positive territory, and
      so the Fund's underweight, which was driven by our concerns about the
      potential for new health care-related legislation coming out of Washington
      as well as future regulations on drug pricing, hurt relative returns. We
      continue to hold this long-term view of the health care sector. The
      underweights to utilities and real estate detracted from the Fund's
      benchmark-relative performance as many investors fled to those sectors,
      which tend to be regarded as "bond proxies" by the market, during the
      fourth-quarter "risk-off" environment. We did not feel the valuations in
      those sectors were warranted, and we believe interest rates will
      eventually move up again, which makes the bond proxies even more expensive
      from a valuation standpoint.

      Individual portfolio positions that detracted from the Fund's
      benchmark-relative performance during the period included National Oilwell
      Varco, Laboratory Corporation of America, Masco, and Halliburton. National
      Oilwell Varco has typically benefited from increases in offshore capital
      expenditures ("capex"). We expected offshore capex to increase, but
      struggling oil prices put a damper on that during the six-month period. We
      sold the stock after it underperformed and it became more obvious that the
      offshore capex would not playout as we anticipated. Laboratory Corporation
      of America struggled during the period after indicating that its financial
      results would likely come in below expectations due to
      lower-than-anticipated volume growth in LabCorp Diagnostics, among other
      issues. The softness in demand was primarily due to slower growth in
      referred direct-to-consumer genetic testing, lower referral volumes from
      hospitals and health systems, volume declines from certain managed care
      plans that will no longer be exclusive to LabCorp in 2019, and adverse
      weather. We re-evaluated our investment case for the company after the
      stock price slumped, and we felt that the market's valuation had become
      overly pessimistic. The stock eventually rallied after the late-2018
      decline, and we then reduced the Fund's position after the valuation
      rebounded. Shares of Masco, a plumbing fixtures and painting company,
      declined over the six-month period due to the market's concerns over the
      deceleration of the domestic economy and the potential slowdown

6 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



      in the housing market that would likely accompany the deceleration. We
      sold the stock as we consolidated the portfolio's cyclical positions into
      our highest-conviction holdings, including United Rentals, Stanley Black &
      Decker, and Emerson Electric. Finally, the Fund's position in Halliburton
      underperformed and detracted from benchmark-relative returns.
      Halliburton's story was similar to National Oilwell Varco's, in that capex
      increases in the oilfield services area did not materialize as hoped
      during the period, due to oil-price volatility. The company has also
      experienced problems in the Permian (shale) Basin, due to pipeline
      constraints, which we believe will be alleviated in late 2019.

Q     Which of your investment decisions benefited the Fund's benchmark-relative
      performance during the six-month period ended February 28, 2019?

A     The main positive contributors to the Fund's benchmark-relative
      performance during the six-month period were an overweight to consumer
      staples and stock selection results in materials and financials. It is
      important to note that we attempt to balance risk while managing the
      portfolio. Part of the strategy entails looking at sectors with companies
      that we believe have stable business models and attractive valuations.
      Consumer staples is one such sector, and so we overweighted the Fund to
      consumer staples during the six-month period. The decision was rewarded
      when the sector posted a positive return of more than 5% during a period
      that saw roughly half the sectors within the Russell Index finish in
      negative territory.

      Individual positions that contributed positively to the Fund's
      benchmark-relative returns during the period included Procter & Gamble
      (P&G), American Electric Power, Progressive, and Marsh & McLennan. P&G
      performed quite well during the six-month period and boosted the Fund's
      benchmark-relative performance. We had purchased the stock earlier in the
      year when valuations in the consumer staples sector were more attractive.
      P&G has displayed improved performance and strategy execution, and we are
      encouraged by the company's recent decision to rationalize its cost
      structure by removing over 100 brands, while returning significant cash
      back to shareholders in the form of dividends*. A position in American
      Electric Power, the Fund's only utilities stock, was another positive
      performer during the six-month period, as investors gravitated toward the
      higher-quality, stable company during the late-2018 period of market
      turbulence. Insurer Progressive is a good example of our strategy to seek

*     Dividends are not guaranteed.

                  Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 7



      out stable companies with good valuations. Progressive is also a major
      player in the auto insurance industry and is making a big move into the
      home/auto insurance bundling area. Marsh & McLennan, an
      insurance-brokerage firm with a high-quality business model, is also
      representative of the types of stocks we seek to own in the portfolio.

Q     Did you invest in any derivative securities during the six-month period
      ended February 28, 2019? If so, did the derivatives have a material effect
      on the Fund's performance?

A     No, the Fund held no derivatives during the period.

Q     What is your current outlook for the equity markets, and how is the Fund
      positioned heading into the second half of its fiscal year?

A     The market has had a very strong start to 2019, with the S&P 500 up by
      13.7% and the Fund's benchmark, the Russell Index, up nearly 12% as of the
      end of the first quarter. Since 1926, the S&P 500 has delivered
      double-digit returns in the first quarter 14 times, and in only four of
      those years -- 1930, 1986, 1987, and 2012 -- did the market fail to post a
      return of 20% or better for the full 12 months. While each market
      environment is unique, we do not currently observe conditions that have
      typically led to a bear market in the past, such as asset bubbles, heavy
      inflows into equity market funds, a big pickup in merger & acquisition
      activity, excessive initial public offering activity, rising real interest
      rates, and a shift towards a more narrow, defensive market leadership. In
      fact, the defensive rotation we saw during the latter half of 2018 serves
      to demonstrate that the market does not ignore fundamental risks.

      Valuation and future earnings revisions drive market returns, and we have
      observed that earnings revisions started to improve again in March, after
      period-end. This could mean that the earnings recession that worried the
      market towards the end of 2018 may be over, as a global, synchronized
      upturn in the second half of 2019 seems promising. We believe a more
      accommodative Fed, a trade deal, and China's stimulus efforts should all
      have a meaningful, positive impact on future earnings, as those issues
      were the biggest drivers of negative earnings revisions in the latter part
      of 2018. Moreover, a still-healthy US consumer, stronger top-line growth,
      and still-manageable wage inflation suggests that the trajectory of
      corporate profit margins is likely to reverse.

8 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



      While earnings revisions can be important in the short- to medium-term,
      ultimately, we believe valuation is the single most important determinant
      of investment returns. We have been struggling to find relative value in
      sectors such as consumer staples, health care, and utilities. In addition,
      consumer staples companies increasingly face challenges from e-commerce as
      well as from consumer preferences for fewer processed foods & beverages,
      issues that make their business models less stable than they have ever
      been. However, those challenges are not priced into current valuations.
      Health care is front and center when it comes to political debate, and
      there are few issues that lawmakers in Washington can agree upon as much
      as they agree on the need to restrain drug prices. Current valuations do
      not fully embed such risks to future profits in the health care sector.
      Meanwhile, utilities stocks, while not facing any meaningful business
      model challenges, are simply overvalued, in our view.

      In managing the Fund, we seek to identify stocks of companies with quality
      business models and reasonable valuations, as we believe that approach can
      serve the Fund's investors well over time. It is our belief that we can
      find similarly stable business models in other areas of the market.

      The portfolio's biggest overweight relative to the Russell Index as of
      period-end is in the Financials sector, though a meaningful component of
      the overweight is allocated to financial services stocks that carry little
      or no interest-rate sensitivity or credit risks. The aforementioned
      Progressive and Marsh & McLennan are two such examples. We also continue
      to maintain large Fund positions in two of the three biggest U.S. banks:
      Bank of America and JPMorgan. We see both firms as structural winners
      among banks, given their technological and scale advantages in a rapidly
      evolving competitive landscape, which also features a regulatory construct
      that we feel may ultimately lead to the big banks demonstrating that they
      indeed have stable business models, thus making a repeat of the 2008
      financial crisis unlikely.

      Another meaningful portfolio overweight versus the benchmark is in the
      defense industry, as many defense companies have shown they have very
      stable, high-quality business models, driven by the prevailing, and
      persistent, geopolitical environment. In that area, Raytheon, a leader in
      the development of missile systems and cyber security, is one of the
      Fund's largest positions.


                  Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 9



      Finally, we are bullish on sectors serving the U.S. consumer, particularly
      retail spending on home repair & remodels, as we have a large Fund
      position in Home Depot. Home values, which are the biggest driver of
      spending, have been steady; the age of the average U.S. house is high as
      compared with history; and people are often choosing to remodel rather
      than move. In addition, the U.S. consumer in general remains quite
      healthy.

      Our disciplined and structured investment process is focused on
      identifying high-conviction holdings and on diligent portfolio
      surveillance, based on: 1) extensive analyst industry experience; 2)
      comprehensive, creative, and independent research; and 3) a common
      corporate performance-and-valuation framework grounded in business model
      economics, which is demonstrated through our proprietary economic value
      added (EVA) model. The result is a portfolio containing what we believe
      are stocks of higher-quality companies than those comprising the Russell
      Index benchmark, but with below-average valuation metrics based on
      earnings and profitability. We believe that combination positions the Fund
      to potentially provide favorable returns for its shareholders.

10 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



Please refer to the Schedule of Investments on pages 20-24 for a full listing
of Fund securities.

All investments are subject to risk, including the possible loss of principal.
In the past several years, financial markets have experienced increased
volatility, depressed valuations, decreased liquidity and heightened
uncertainty. These conditions may continue, recur, worsen or spread.

The Fund may invest in fewer than 40 securities, and as a result, the Fund's
performance may be more volatile than the performance of funds holding more
securities.

Investments in small- and mid-sized companies may offer the potential for
higher returns, but are also subject to greater short-term price fluctuations
than larger, more established companies.

At times, the Fund's investments may represent industries or industry sectors
that are interrelated or have common risks, making it more susceptible to any
economic, political, or regulatory developments or other risks affecting those
industries and sectors.

These risks may increase share price volatility.

Before investing, consider the product's investment objectives, risks, charges
and expenses. Contact your advisor or 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 Disciplined Value Fund | Semiannual Report | 2/28/19 11



Portfolio Summary | 2/28/19

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

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



                                                                        
Common Stocks                                                              97.8%
U.S. Government and Agency Obligations                                      2.2%


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

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



                                                                        
Financials                                                                 29.6%
Information Technology                                                     13.2%
Industrials                                                                13.0%
Health Care                                                                 9.9%
Energy                                                                      9.5%
Consumer Discretionary                                                      6.9%
Consumer Staples                                                            5.8%
Communication Services                                                      3.7%
Real Estate                                                                 3.2%
Government                                                                  2.2%
Utilities                                                                   1.8%
Materials                                                                   1.2%


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



                                                                        
 1. Bank of America Corp.                                                  5.60%
--------------------------------------------------------------------------------
 2. JPMorgan Chase & Co.                                                   5.32
--------------------------------------------------------------------------------
 3. Progressive Corp.                                                      4.82
--------------------------------------------------------------------------------
 4. Raytheon Co.                                                           4.51
--------------------------------------------------------------------------------
 5. Marsh & McLennan Cos., Inc.                                            4.40
--------------------------------------------------------------------------------
 6. TOTAL SA (A.D.R.)                                                      4.06
--------------------------------------------------------------------------------
 7. Apple, Inc.                                                            3.83
--------------------------------------------------------------------------------
 8. Emerson Electric Co.                                                   3.15
--------------------------------------------------------------------------------
 9. Home Depot, Inc.                                                       3.04
--------------------------------------------------------------------------------
10. Laboratory Corp. of America Holdings                                   2.95
--------------------------------------------------------------------------------


*     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.

12 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



Prices and Distributions | 2/28/19

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



--------------------------------------------------------------------------------
         Class                 2/28/19                 8/31/18
--------------------------------------------------------------------------------
                                                 
          A                    $13.30                  $16.20
--------------------------------------------------------------------------------
          C                    $13.08                  $15.85
--------------------------------------------------------------------------------
          R                    $12.79                  $15.63
--------------------------------------------------------------------------------
          Y                    $13.38                  $16.30
--------------------------------------------------------------------------------


Distributions per Share: 9/1/18 - 2/28/19
--------------------------------------------------------------------------------



--------------------------------------------------------------------------------
                                           Short-Term          Long-Term
         Class          Dividends         Capital Gains       Capital Gains
--------------------------------------------------------------------------------
                                                       
          A             $0.1351             $0.6369             $1.4540
--------------------------------------------------------------------------------
          C             $    --             $0.6369             $1.4540
--------------------------------------------------------------------------------
          R             $0.0996             $0.6369             $1.4540
--------------------------------------------------------------------------------
          Y             $0.1709             $0.6369             $1.4540
--------------------------------------------------------------------------------


The Russell 1000 Value Index is an unmanaged measure of the performance of
large-cap U.S. value 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 14-17.

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 13



Performance Update | 2/28/19                                      Class A Shares

Investment Returns
--------------------------------------------------------------------------------
The mountain chart on the right shows the change in value of a $10,000
investment made in Class A shares of Pioneer Disciplined Value Fund at public
offering price during the periods shown, compared to that of the Russell 1000
Value Index.



Average Annual Total Returns
(As of February 28, 2019)
--------------------------------------------------------
                     Net        Public       Russell
                     Asset      Offering     1000
                     Value      Price        Value
Period               (NAV)      (POP)        Index
--------------------------------------------------------
                                    
10 years             12.89%     12.22%       15.39%
5 years               7.01       5.75         8.09
1 year               -3.24      -8.81         3.16
--------------------------------------------------------


Expense Ratio
(Per prospectus dated December 31, 2018)
--------------------------------------------------------
                Gross
--------------------------------------------------------
             
                1.13%
--------------------------------------------------------


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

Value of $10,000 Investment



                        Pioneer Disciplined             Russell 1000
                        Value Fund                      Value Index
                                                  
2/09                    $ 9,425                         $10,000
2/10                    $13,803                         $15,650
2/11                    $16,224                         $19,118
2/12                    $16,740                         $19,534
2/13                    $18,544                         $22,977
2/14                    $22,573                         $28,363
2/15                    $24,832                         $32,188
2/16                    $21,866                         $29,160
2/17                    $28,275                         $37,653
2/18                    $32,736                         $40,572
2/19                    $31,674                         $41,854


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. NAV
returns would have been lower had sales charges been reflected. POP returns
reflect deduction of maximum 5.75% sales charge. All results are historical and
assume the reinvestment of dividends and capital gains. Other share classes are
available for which performance and expenses will differ.

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

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

The Fund acquired the assets and liabilities of Pioneer Disciplined Value Fund
("the predecessor fund") on June 7, 2013. As a result of the reorganization,
the predecessor fund's performance and financial history became the performance
and financial history of the Fund. The performance of Class A shares of the
Fund is the performance of Class A shares of the predecessor fund for periods
prior to the reorganization, and has not been restated to reflect any
differences in expenses.

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

14 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



Performance Update | 2/28/19                                      Class C Shares

Investment Returns
--------------------------------------------------------------------------------
The mountain chart on the right shows the change in value of a $10,000
investment made in Class C shares of Pioneer Disciplined Value Fund during the
periods shown, compared to that of the Russell 1000 Value Index.



Average Annual Total Returns
(As of February 28, 2019)
--------------------------------------------------------
                                             Russell
                                             1000
                    If         If            Value
Period              Held       Redeemed      Index
--------------------------------------------------------
                                    
10 years            11.97%     11.97%        15.39%
5 years              6.25       6.25          8.09
1 year              -3.93      -3.93          3.16
--------------------------------------------------------


Expense Ratio
(Per prospectus dated December 31, 2018)
--------------------------------------------------------
                Gross
--------------------------------------------------------
             
                1.84%
--------------------------------------------------------


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

Value of $10,000 Investment



                        Pioneer Disciplined             Russell 1000
                        Value Fund                      Value Index
                                                  
2/09                    $10,000                         $10,000
2/10                    $14,508                         $15,650
2/11                    $16,912                         $19,118
2/12                    $17,253                         $19,534
2/13                    $18,963                         $22,977
2/14                    $22,879                         $28,363
2/15                    $24,992                         $32,188
2/16                    $21,837                         $29,160
2/17                    $28,036                         $37,653
2/18                    $32,248                         $40,572
2/19                    $30,980                         $41,854


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. "If Redeemed" returns would have been lower had
sales charges been reflected. All results are historical and assume the
reinvestment of dividends and capital gains. Other share classes are available
for which performance and expenses will differ.

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

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

The Fund acquired the assets and liabilities of Pioneer Disciplined Value Fund
("the predecessor fund") on June 7, 2013. As a result of the reorganization,
the predecessor fund's performance and financial history became the performance
and financial history of the Fund. The performance of Class C shares of the
Fund is the performance of Class C shares of the predecessor fund for periods
prior to the reorganization, and has not been restated to reflect any
differences in expenses.

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

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 15



Performance Update | 2/28/19                                      Class R Shares

Investment Returns
--------------------------------------------------------------------------------
The mountain chart on the right shows the change in value of a $10,000
investment made in Class R shares of Pioneer Disciplined Value Fund during the
periods shown, compared to that of the Russell 1000 Value Index.



Average Annual Total Returns
(As of February 28, 2019)
--------------------------------------------------------
                                             Russell
                                             1000
                          Net Asset          Value
Period                    Value (NAV)        Index
--------------------------------------------------------
                                       
10 years                  12.74%             15.39%
5 years                    6.76               8.09
1 year                    -3.42               3.16
--------------------------------------------------------


Expense Ratio
(Per prospectus dated December 31, 2018)
--------------------------------------------------------
                Gross
--------------------------------------------------------
             
                1.52%
--------------------------------------------------------


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

Value of $10,000 Investment



                        Pioneer Disciplined             Russell 1000
                        Value Fund                      Value Index
                                                  
2/09                    $10,000                         $10,000
2/10                    $14,645                         $15,650
2/11                    $17,214                         $19,118
2/12                    $17,761                         $19,534
2/13                    $19,675                         $22,977
2/14                    $23,907                         $28,363
2/15                    $26,241                         $32,188
2/16                    $23,038                         $29,160
2/17                    $29,750                         $37,653
2/18                    $34,341                         $40,572
2/19                    $33,165                         $41,854


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 Fund acquired the assets and liabilities of Pioneer Disciplined Value Fund
("the predecessor fund") on June 7, 2013. As a result of the reorganization,
the predecessor fund's performance and financial history became the performance
and financial history of the Fund. The 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.

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

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

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

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

16 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19


Performance Update | 2/28/19                                      Class Y Shares

Investment Returns
--------------------------------------------------------------------------------
The mountain chart on the right shows the change in value of a $5 million
investment made in Class Y shares of Pioneer Disciplined Value Fund during the
periods shown, compared to that of the Russell 1000 Value Index.



Average Annual Total Returns
(As of February 28, 2019)
--------------------------------------------------------
                                             Russell
                                             1000
                            Net Asset        Value
Period                      Value (NAV)      Index
--------------------------------------------------------
                                       
10 years                    13.25%           15.39%
5 years                      7.36             8.09
1 year                      -2.96             3.16
--------------------------------------------------------


Expense Ratio
(Per prospectus dated December 31, 2018)
--------------------------------------------------------
                Gross
--------------------------------------------------------
             
                0.83%
--------------------------------------------------------


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

Value of $5 Million Investment



                        Pioneer Disciplined             Russell 1000
                        Value Fund                      Value Index
                                                  
2/09                    $ 5,000,000                     $ 5,000,000
2/10                    $ 7,348,596                     $ 7,824,831
2/11                    $ 8,663,892                     $ 9,559,100
2/12                    $ 8,963,038                     $ 9,767,124
2/13                    $ 9,967,697                     $11,488,731
2/14                    $12,163,977                     $14,181,404
2/15                    $13,435,095                     $16,093,775
2/16                    $11,862,991                     $14,579,829
2/17                    $15,392,732                     $18,826,370
2/18                    $17,880,069                     $20,286,222
2/19                    $17,350,558                     $20,927,248


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 Fund acquired the assets and liabilities of Pioneer Disciplined Value Fund
("the predecessor fund") on June 7, 2013. As a result of the reorganization,
the predecessor fund's performance and financial history became the performance
and financial history of the Fund. The performance of Class Y shares of the
Fund is the performance of Class Y shares of the predecessor fund for periods
prior to the reorganization, and has not been restated to reflect any
differences in expenses.

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

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

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

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

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 17



Comparing Ongoing Fund Expenses

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

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

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

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

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

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

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

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

Expenses Paid on a $1,000 Investment in Pioneer Disciplined Value Fund

Based on actual returns from September 1, 2018, through February 28, 2019.



--------------------------------------------------------------------------------
Share Class                     A             C             R             Y
--------------------------------------------------------------------------------
                                                          
Beginning Account           $1,000.00     $1,000.00     $1,000.00     $1,000.00
Value on 9/1/18
--------------------------------------------------------------------------------
Ending Account                $963.40       $960.70       $963.30       $965.00
Value (after expenses)
on 2/28/19
--------------------------------------------------------------------------------
Expenses Paid                   $5.60         $9.09         $6.62         $4.19
During Period*
--------------------------------------------------------------------------------


*     Expenses are equal to the Fund's annualized expense ratio of 1.15%, 1.87%,
      1.36%, and 0.86% for Class A, Class C, Class R, and Class Y shares,
      respectively, multiplied by the average account value over the period,
      multiplied by 181/365 (to reflect the partial year period).

18 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



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 Disciplined Value Fund

Based on a hypothetical 5% return per year before expenses, reflecting the
period from September 1, 2018, through February 28, 2019.



--------------------------------------------------------------------------------
Share Class                     A             C             R             Y
--------------------------------------------------------------------------------
                                                          
Beginning Account           $1,000.00     $1,000.00     $1,000.00     $1,000.00
Value on 9/1/18
--------------------------------------------------------------------------------
Ending Account              $1,019.09     $1,015.52     $1,018.05     $1,020.53
Value (after expenses)
on 2/28/19
--------------------------------------------------------------------------------
Expenses Paid                   $5.76         $9.35         $6.80         $4.31
During Period*
--------------------------------------------------------------------------------


*     Expenses are equal to the Fund's annualized expense ratio of 1.15%, 1.87%,
      1.36%, and 0.86% for Class A, Class C, Class R, and Class Y shares,
      respectively, multiplied by the average account value over the period,
      multiplied by 181/365 (to reflect the partial year period).

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 19



Schedule of Investments | 2/28/19 (unaudited)



-----------------------------------------------------------------------------------------------------------
Shares                                                                                         Value
-----------------------------------------------------------------------------------------------------------
                                                                                         
                     UNAFFILIATED ISSUERS -- 99.0%
                     COMMON STOCKS -- 96.8% of Net Assets
                     Aerospace & Defense -- 4.5%
   102,880           Raytheon Co.                                                              $ 19,187,120
                                                                                               ------------
                     Total Aerospace & Defense                                                 $ 19,187,120
-----------------------------------------------------------------------------------------------------------
                     Air Freight & Logistics -- 2.0%
    47,927           FedEx Corp.                                                               $  8,674,787
                                                                                               ------------
                     Total Air Freight & Logistics                                             $  8,674,787
-----------------------------------------------------------------------------------------------------------
                     Auto Components -- 2.2%
   113,107           Aptiv Plc                                                                 $  9,400,323
                                                                                               ------------
                     Total Auto Components                                                     $  9,400,323
-----------------------------------------------------------------------------------------------------------
                     Automobiles -- 0.5%
    61,353           Harley-Davidson, Inc.                                                     $  2,277,423
                                                                                               ------------
                     Total Automobiles                                                         $  2,277,423
-----------------------------------------------------------------------------------------------------------
                     Banks -- 10.8%
   818,957           Bank of America Corp.                                                     $ 23,815,269
   216,733           JPMorgan Chase & Co.                                                        22,618,256
                                                                                               ------------
                     Total Banks                                                               $ 46,433,525
-----------------------------------------------------------------------------------------------------------
                     Beverages -- 1.7%
    63,005           PepsiCo., Inc.                                                            $  7,285,898
                                                                                               ------------
                     Total Beverages                                                           $  7,285,898
-----------------------------------------------------------------------------------------------------------
                     Capital Markets -- 5.3%
    24,613           BlackRock, Inc.                                                           $ 10,908,974
   286,053           Morgan Stanley                                                              12,008,505
                                                                                               ------------
                     Total Capital Markets                                                     $ 22,917,479
-----------------------------------------------------------------------------------------------------------
                     Chemicals -- 0.5%
    17,835           International Flavors & Fragrances, Inc.                                  $  2,273,963
                                                                                               ------------
                     Total Chemicals                                                           $  2,273,963
-----------------------------------------------------------------------------------------------------------
                     Communications Equipment -- 4.0%
   241,071           Cisco Systems, Inc.                                                       $ 12,480,246
    32,051           Motorola Solutions, Inc.                                                     4,587,139
                                                                                               ------------
                     Total Communications Equipment                                            $ 17,067,385
-----------------------------------------------------------------------------------------------------------
                     Consumer Finance -- 2.2%
   131,530           Discover Financial Services                                               $  9,418,863
                                                                                               ------------
                     Total Consumer Finance                                                    $  9,418,863
-----------------------------------------------------------------------------------------------------------
                     Containers & Packaging -- 0.6%
    50,916           Ball Corp.                                                                $  2,789,178
                                                                                               ------------
                     Total Containers & Packaging                                              $  2,789,178
-----------------------------------------------------------------------------------------------------------


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

20 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19





-----------------------------------------------------------------------------------------------------------
Shares                                                                                         Value
-----------------------------------------------------------------------------------------------------------
                                                                                         
                     Diversified Telecommunication Services -- 3.1%
   387,062           AT&T, Inc.                                                                $ 12,045,370
   102,843           CenturyLink, Inc.                                                            1,356,499
                                                                                               ------------
                     Total Diversified Telecommunication Services                              $ 13,401,869
-----------------------------------------------------------------------------------------------------------
                     Electric Utilities -- 1.7%
    91,957           American Electric Power Co., Inc.                                         $  7,462,311
                                                                                               ------------
                     Total Electric Utilities                                                  $  7,462,311
-----------------------------------------------------------------------------------------------------------
                     Electrical Equipment -- 3.1%
   196,755           Emerson Electric Co.                                                      $ 13,408,853
                                                                                               ------------
                     Total Electrical Equipment                                                $ 13,408,853
-----------------------------------------------------------------------------------------------------------
                     Energy Equipment & Services -- 1.0%
   136,251           Halliburton Co.                                                           $  4,181,543
                                                                                               ------------
                     Total Energy Equipment & Services                                         $  4,181,543
-----------------------------------------------------------------------------------------------------------
                     Entertainment -- 0.6%
    81,162           Viacom, Inc., Class B                                                     $  2,371,554
                                                                                               ------------
                     Total Entertainment                                                       $  2,371,554
-----------------------------------------------------------------------------------------------------------
                     Equity Real Estate Investment Trusts (REITs) -- 3.2%
   122,745           Liberty Property Trust                                                    $  5,809,521
   112,142           Prologis, Inc.                                                               7,856,668
                                                                                               ------------
                     Total Equity Real Estate Investment Trusts (REITs)                        $ 13,666,189
-----------------------------------------------------------------------------------------------------------
                     Food & Staples Retailing -- 1.9%
     9,702           Costco Wholesale Corp.                                                    $  2,122,215
    83,155           Walgreens Boots Alliance, Inc.                                               5,919,804
                                                                                               ------------
                     Total Food & Staples Retailing                                            $  8,042,019
-----------------------------------------------------------------------------------------------------------
                     Health Care Equipment & Supplies -- 2.5%
    32,454(a)        Hologic, Inc.                                                             $  1,530,206
    98,691           Medtronic Plc                                                                8,931,536
                                                                                               ------------
                     Total Health Care Equipment & Supplies                                    $ 10,461,742
-----------------------------------------------------------------------------------------------------------
                     Health Care Providers & Services -- 2.9%
    84,507(a)        Laboratory Corp. of America Holdings                                      $ 12,527,318
                                                                                               ------------
                     Total Health Care Providers & Services                                    $ 12,527,318
-----------------------------------------------------------------------------------------------------------
                     Household Products -- 2.1%
    92,833           Procter & Gamble Co.                                                      $  9,148,692
                                                                                               ------------
                     Total Household Products                                                  $  9,148,692
-----------------------------------------------------------------------------------------------------------
                     Insurance -- 11.1%
   201,342           Marsh & McLennan Cos., Inc.                                               $ 18,728,833
   281,328           Progressive Corp.                                                           20,508,811
    83,627           Prudential Financial, Inc.                                                   8,015,648
                                                                                               ------------
                     Total Insurance                                                           $ 47,253,292
-----------------------------------------------------------------------------------------------------------


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

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 21



Schedule of Investments | 2/28/19 (unaudited)(continued)



-----------------------------------------------------------------------------------------------------------
Shares                                                                                         Value
-----------------------------------------------------------------------------------------------------------
                                                                                         
                     Machinery -- 1.2%
    39,397           Stanley Black & Decker, Inc.                                              $  5,217,345
                                                                                               ------------
                     Total Machinery                                                           $  5,217,345
-----------------------------------------------------------------------------------------------------------
                     Multiline Retail -- 0.5%
    17,598           Dollar General Corp.                                                      $  2,084,659
                                                                                               ------------
                     Total Multiline Retail                                                    $  2,084,659
-----------------------------------------------------------------------------------------------------------
                     Oil, Gas & Consumable Fuels -- 8.4%
   106,098           ConocoPhillips                                                            $  7,198,749
   124,225           EOG Resources, Inc.                                                         11,677,150
   303,239           TOTAL SA (A.D.R.)                                                           17,257,332
                                                                                               ------------
                     Total Oil, Gas & Consumable Fuels                                         $ 36,133,231
-----------------------------------------------------------------------------------------------------------
                     Pharmaceuticals -- 4.4%
    55,868           Eli Lilly & Co.                                                           $  7,055,570
   150,160           Merck & Co., Inc.                                                           12,206,506
                                                                                               ------------
                     Total Pharmaceuticals                                                     $ 19,262,076
-----------------------------------------------------------------------------------------------------------
                     Road & Rail -- 1.1%
    41,522           Kansas City Southern                                                      $  4,510,950
                                                                                               ------------
                     Total Road & Rail                                                         $  4,510,950
-----------------------------------------------------------------------------------------------------------
                     Semiconductors & Semiconductor Equipment -- 3.6%
    96,011(a)        Advanced Micro Devices, Inc.                                              $  2,259,139
    49,586           Lam Research Corp.                                                           8,731,599
   110,191(a)        Micron Technology, Inc.                                                      4,504,608
                                                                                               ------------
                     Total Semiconductors & Semiconductor Equipment                            $ 15,495,346
-----------------------------------------------------------------------------------------------------------
                     Software -- 1.7%
   140,420           Oracle Corp.                                                              $  7,320,095
                                                                                               ------------
                     Total Software                                                            $  7,320,095
-----------------------------------------------------------------------------------------------------------
                     Specialty Retail -- 3.0%
    69,817           Home Depot, Inc.                                                          $ 12,925,919
                                                                                               ------------
                     Total Specialty Retail                                                    $ 12,925,919
-----------------------------------------------------------------------------------------------------------
                     Technology Hardware, Storage & Peripherals -- 3.8%
    94,132           Apple, Inc.                                                               $ 16,298,956
                                                                                               ------------
                     Total Technology Hardware, Storage & Peripherals                          $ 16,298,956
-----------------------------------------------------------------------------------------------------------
                     Textiles, Apparel & Luxury Goods -- 0.6%
    21,269           PVH Corp.                                                                 $  2,442,532
                                                                                               ------------
                     Total Textiles, Apparel & Luxury Goods                                    $  2,442,532
-----------------------------------------------------------------------------------------------------------
                     Trading Companies & Distributors -- 1.0%
    32,692(a)        United Rentals, Inc.                                                      $  4,400,016
                                                                                               ------------
                     Total Trading Companies & Distributors                                    $  4,400,016
-----------------------------------------------------------------------------------------------------------
                     TOTAL COMMON STOCKS
                     (Cost $398,853,322)                                                       $415,742,451
-----------------------------------------------------------------------------------------------------------


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

22 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19





-----------------------------------------------------------------------------------------------------------
Principal
Amount
USD ($)                                                                                        Value
-----------------------------------------------------------------------------------------------------------
                                                                                         
                     U.S. GOVERNMENT AND AGENCY OBLIGATIONS --
                     2.2% of Net Assets
 2,155,000(b)        U.S. Treasury Bills, 3/5/19                                               $  2,154,439
 7,355,000(b)        U.S. Treasury Bills, 3/26/19                                                 7,342,805
-----------------------------------------------------------------------------------------------------------
                     TOTAL U.S. GOVERNMENT AND AGENCY OBLIGATIONS
                     (Cost $9,497,283)                                                         $  9,497,244
-----------------------------------------------------------------------------------------------------------
                     TOTAL INVESTMENTS IN UNAFFILIATED ISSUERS -- 99.0%
                     (Cost $408,350,605)                                                       $425,239,695
-----------------------------------------------------------------------------------------------------------
                     OTHER ASSETS AND LIABILITIES -- 1.0%                                      $  4,146,491
-----------------------------------------------------------------------------------------------------------
                     NET ASSETS -- 100.0%                                                      $429,386,186
===========================================================================================================


(A.D.R.)     American Depositary Receipts.

(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 six months ended February 28, 2019, aggregated $229,908,497 and
$284,638,681, 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 six months ended
February 28, 2019, the Fund did not engage in cross trade activity.

At February 28, 2019, the net unrealized appreciation on investments based on
cost for federal tax purposes of $409,068,617 was as follows:



                                                                          
   Aggregate gross unrealized appreciation for all investments in which
     there is an excess of value over tax cost                               $ 30,021,932
   Aggregate gross unrealized depreciation for all investments in which
     there is an excess of tax cost over value                                (13,850,854)
                                                                             ------------
   Net unrealized appreciation                                               $ 16,171,078
                                                                             ============


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

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

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

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

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

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 23



Schedule of Investments | 2/28/19 (unaudited)(continued)

The following is a summary of the inputs used as of February 28, 2019, in
valuing the Fund's investments.



--------------------------------------------------------------------------------------------------
                                        Level 1          Level 2        Level 3     Total
--------------------------------------------------------------------------------------------------
                                                                        
Common Stocks                           $415,742,451     $       --     $ --        $415,742,451
U.S. Government and
   Agency Obligations                             --      9,497,244       --           9,497,244
--------------------------------------------------------------------------------------------------
Total Investments in Securities         $415,742,451     $9,497,244     $ --        $425,239,695
==================================================================================================


During the six months ended February 28, 2019, there were no transfers between
Levels 1, 2 and 3.

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

24 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



Statement of Assets and Liabilities | 2/28/19 (unaudited)



                                                                              
ASSETS:
  Investments in unaffiliated issuers, at value (cost $408,350,605)              $425,239,695
  Cash                                                                              4,266,267
  Receivables --
     Fund shares sold                                                                 197,850
     Dividends                                                                        586,413
  Other assets                                                                         64,804
---------------------------------------------------------------------------------------------
        Total assets                                                             $430,355,029
=============================================================================================
LIABILITIES:
  Payables --
     Fund shares repurchased                                                     $    730,804
     Trustees' fees                                                                     2,960
     Transfer agent fees                                                               73,994
     Registration fees                                                                 74,161
  Due to affiliates                                                                    39,474
  Accrued expenses                                                                     47,450
---------------------------------------------------------------------------------------------
        Total liabilities                                                        $    968,843
=============================================================================================
NET ASSETS:
  Paid-in capital                                                                $422,699,984
  Distributable earnings                                                            6,686,202
---------------------------------------------------------------------------------------------
        Net assets                                                               $429,386,186
=============================================================================================
NET ASSET VALUE PER SHARE:
  No par value (unlimited number of shares authorized)
     Class A (based on $291,518,176/21,911,824 shares)                           $      13.30
     Class C (based on $34,244,224/2,618,747 shares)                             $      13.08
     Class R (based on $10,701,674/836,951 shares)                               $      12.79
     Class Y (based on $92,922,112/6,944,426 shares)                             $      13.38
MAXIMUM OFFERING PRICE PER SHARE:
     Class A (based on $13.30 net asset value per share/100% - 5.75%
        maximum sales charge)                                                    $      14.11
=============================================================================================


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

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 25



Statement of Operations (unaudited)

For the Six Months Ended 2/28/19



                                                                                    
INVESTMENT INCOME:
  Dividends from unaffiliated issuers (net of foreign taxes
     withheld $70,261)                                                    $6,147,970
  Interest from unaffiliated issuers                                         108,684
-------------------------------------------------------------------------------------------------------
       Total investment income                                                            $  6,256,654
-------------------------------------------------------------------------------------------------------
EXPENSES:
  Management fees                                                         $1,457,993
  Administrative expense                                                     108,797
  Transfer agent fees
     Class A                                                                 184,013
     Class C                                                                  19,725
     Class R                                                                  10,780
     Class Y                                                                  59,176
  Distribution fees
     Class A                                                                 372,676
     Class C                                                                 201,673
     Class R                                                                  26,073
  Shareowner communications expense                                           20,675
  Custodian fees                                                              12,326
  Registration fees                                                           53,867
  Professional fees                                                           16,204
  Printing expense                                                            28,209
  Trustees' fees                                                               8,152
  Insurance expense                                                            3,133
  Miscellaneous                                                               27,439
-------------------------------------------------------------------------------------------------------
     Total expenses                                                                       $  2,610,911
     Less fees waived and expenses reimbursed by the Adviser                                   (19,179)
-------------------------------------------------------------------------------------------------------
  Net expenses                                                                            $  2,591,732
-------------------------------------------------------------------------------------------------------
       Net investment income                                                              $  3,664,922
-------------------------------------------------------------------------------------------------------
REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS:
  Net realized gain (loss) on:
     Investments in unaffiliated issuers                                                  $ (7,444,925)
-------------------------------------------------------------------------------------------------------
  Change in net unrealized appreciation (depreciation) on:
     Investments in unaffiliated issuers                                                  $(18,231,213)
-------------------------------------------------------------------------------------------------------
  Net realized and unrealized gain (loss) on investments                                  $(25,676,138)
-------------------------------------------------------------------------------------------------------
  Net decrease in net assets resulting from operations                                    $(22,011,216)
=======================================================================================================


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

26 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



Statements of Changes in Net Assets



--------------------------------------------------------------------------------------------------
                                                                 Six Months
                                                                 Ended
                                                                 2/28/19            Year Ended
                                                                 (unaudited)        8/31/18
--------------------------------------------------------------------------------------------------
                                                                              
FROM OPERATIONS:
Net investment income (loss)                                     $   3,664,922      $   3,140,844
Net realized gain (loss) on investments                             (7,444,925)        70,156,937
Change in net unrealized appreciation (depreciation) on
  investments                                                      (18,231,213)       (13,400,973)
--------------------------------------------------------------------------------------------------
     Net increase (decrease) in net assets resulting
        from operations                                          $ (22,011,216)     $  59,896,808
--------------------------------------------------------------------------------------------------
DISTRIBUTIONS TO SHAREOWNERS:*
     Class A ($2.23 and $2.43 per share, respectively)           $ (45,467,830)     $ (43,109,750)
     Class C ($2.09 and $2.30 per share, respectively)              (5,432,217)       (13,769,982)
     Class R ($2.19 and $2.38 per share, respectively)              (1,602,207)        (1,631,879)
     Class Y ($2.26 and $2.48 per share, respectively)             (15,694,962)       (21,228,346)
--------------------------------------------------------------------------------------------------
        Total distributions to shareowners                       $ (68,197,216)     $ (79,739,957)
--------------------------------------------------------------------------------------------------
FROM FUND SHARE TRANSACTIONS:
Net proceeds from sales of shares                                $  78,600,941      $  71,524,284
Reinvestment of distributions                                       64,350,172         70,261,333
Cost of shares repurchased                                        (136,798,891)      (179,720,664)
--------------------------------------------------------------------------------------------------
     Net increase (decrease) in net assets resulting
        from Fund share transactions                             $   6,152,222      $ (37,935,047)
--------------------------------------------------------------------------------------------------
     Net decrease in net assets                                  $ (84,056,210)     $ (57,778,196)
NET ASSETS:**
Beginning of period                                              $ 513,442,396      $ 571,220,592
--------------------------------------------------------------------------------------------------
End of period                                                    $ 429,386,186      $ 513,442,396
==================================================================================================
* For the year ended August 31, 2018, distributions to shareowners were presented as follows:
Net investment income:
  Class A ($0.16 per share)                                                         $  (3,153,770)
  Class C ($0.03 per share)                                                              (227,168)
  Class R ($0.11 per share)                                                               (88,850)
  Class Y ($0.21 per share)                                                            (1,993,084)
Net realized gain:
  Class A ($2.27 per share)                                                         $ (39,955,980)
  Class C ($2.27 per share)                                                           (13,542,814)
  Class R ($2.27 per share)                                                            (1,543,029)
  Class Y ($2.27 per share)                                                           (19,235,262)

**For the year ended August 31, 2018, undistributed net investment income was
  presented as follows: $2,243,978.

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

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 27



Statements of Changes in Net Assets (continued)



-----------------------------------------------------------------------------------------------------------
                                       Six Months        Six Months
                                       Ended             Ended
                                       2/28/19           2/28/19             Year Ended       Year Ended
                                       Shares            Amount              8/31/18          8/31/18
                                       (unaudited)       (unaudited)         Shares           Amount
-----------------------------------------------------------------------------------------------------------
                                                                                  
Class A
Shares sold                             4,178,479        $ 63,818,386         1,814,828       $ 29,486,394
Reinvestment of distributions           3,373,770          43,731,261         2,616,595         41,325,920
Less shares repurchased                (4,004,728)        (54,097,867)       (4,344,138)       (70,910,168)
-----------------------------------------------------------------------------------------------------------
  Net increase (decrease)               3,547,521        $ 53,451,780            87,285       $    (97,854)
===========================================================================================================
Class C
Shares sold                               464,767        $  6,289,583           323,202       $  5,154,822
Reinvestment of distributions             368,852           4,699,176           788,637         12,156,647
Less shares repurchased                (3,792,955)        (57,526,917)       (1,769,537)       (28,311,321)
-----------------------------------------------------------------------------------------------------------
  Net decrease                         (2,959,336)       $(46,538,158)         (657,698)      $(10,999,852)
===========================================================================================================
Class R
Shares sold                               109,404        $  1,426,397           107,336       $  1,682,570
Reinvestment of distributions             125,581           1,564,432           104,400          1,590,205
Less shares repurchased                  (119,281)         (1,524,393)         (216,664)        (3,438,487)
-----------------------------------------------------------------------------------------------------------
  Net increase (decrease)                 115,704        $  1,466,436            (4,928)      $   (165,712)
===========================================================================================================
Class Y
Shares sold                               493,398        $  7,066,575         2,147,796       $ 35,200,498
Reinvestment of distributions           1,100,976          14,355,303           955,019         15,188,561
Less shares repurchased                (1,785,941)        (23,649,714)       (4,740,306)       (77,060,688)
-----------------------------------------------------------------------------------------------------------
  Net decrease                           (191,567)       $ (2,227,836)       (1,637,491)      $(26,671,629)
===========================================================================================================


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

28 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



Financial Highlights



------------------------------------------------------------------------------------------------------------------------------------
                                                              Six Months
                                                              Ended         Year        Year        Year        Year       Year
                                                              2/28/19       Ended       Ended       Ended       Ended      Ended
                                                              (unaudited)   8/31/18     8/31/17     8/31/16*    8/31/15*   8/31/14*
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                         
Class A
Net asset value, beginning of period                          $  16.20      $  16.84    $  14.18    $  16.42    $  21.00   $  19.80
------------------------------------------------------------------------------------------------------------------------------------
Increase (decrease) from investment operations:
  Net investment income (loss)                                $   0.11(a)   $   0.10(a) $   0.19(a) $   0.16(a) $   0.15   $   0.16
  Net realized and unrealized gain (loss) on investments         (0.78)         1.69        2.61        0.96       (1.00)      3.85
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) from investment operations            $  (0.67)     $   1.79    $   2.80    $   1.12    $  (0.85)  $   4.01
------------------------------------------------------------------------------------------------------------------------------------
Distributions to shareowners:
  Net investment income                                       $  (0.14)     $  (0.16)   $  (0.14)   $  (0.16)   $  (0.11)  $  (0.10)
  Net realized gain                                              (2.09)        (2.27)         --       (3.20)      (3.62)     (2.71)
------------------------------------------------------------------------------------------------------------------------------------
Total distributions                                           $  (2.23)     $  (2.43)   $  (0.14)   $  (3.36)   $  (3.73)  $  (2.81)
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                    $  (2.90)     $  (0.64)   $   2.66    $  (2.24)   $  (4.58)  $   1.20
------------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                $  13.30      $  16.20    $  16.84    $  14.18    $  16.42   $  21.00
====================================================================================================================================
Total return (b)                                                 (3.66)%(c)    11.10%      19.88%       7.35%      (5.16)%    21.57%
Ratio of net expenses to average net assets                       1.15%(d)      1.13%       1.15%       1.18%       1.17%      1.19%
Ratio of net investment income (loss) to average net assets       1.64%(d)      0.62%       1.23%       1.11%       0.82%      0.74%
Portfolio turnover rate                                             52%(c)       112%        115%        129%        122%        66%
Net assets, end of period (in thousands)                      $291,518      $297,450    $307,799    $316,382    $392,989   $564,898
Ratios with no waiver of fees and assumption of expenses by
  the Adviser and no reduction for fees paid indirectly:
  Total expenses to average net assets                            1.15%(d)      1.13%       1.15%       1.18%       1.17%      1.19%
  Net investment income (loss) to average net assets              1.64%(d)      0.62%       1.23%       1.11%       0.82%      0.74%
====================================================================================================================================


*     The Fund was audited by an independent registered public accounting firm
      other than Ernst & Young LLP.

(a)   The per-share data presented above is based on the average shares
      outstanding for the period presented.

(b)   Assumes initial investment at net asset value at the beginning of each
      period, reinvestment of all distributions, 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)   Not annualized.

(d)   Annualized.

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

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 29



Financial Highlights (continued)



------------------------------------------------------------------------------------------------------------------------------------
                                                             Six Months
                                                             Ended        Year        Year        Year        Year         Year
                                                             2/28/19      Ended       Ended       Ended       Ended        Ended
                                                             (unaudited)  8/31/18     8/31/17     8/31/16*    8/31/15*     8/31/14*
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                         
Class C
Net asset value, beginning of period                         $ 15.85      $ 16.52     $  13.91    $  16.14    $  20.73     $  19.64
------------------------------------------------------------------------------------------------------------------------------------
Increase (decrease) from investment operations:
  Net investment income (loss)                               $  0.06(a)   $ (0.02)(a) $   0.07(a) $   0.05(a) $   0.02     $   0.01
  Net realized and unrealized gain (loss) on investments       (0.74)        1.65         2.57        0.95       (0.99)        3.82
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) from investment operations           $ (0.68)     $  1.63     $   2.64    $   1.00    $  (0.97)    $   3.83
------------------------------------------------------------------------------------------------------------------------------------
Distributions to shareowners:
  Net investment income                                      $    --      $ (0.03)    $  (0.03)   $  (0.03)   $  (0.00)(b) $  (0.03)
  Net realized gain                                            (2.09)       (2.27)          --       (3.20)      (3.62)       (2.71)
------------------------------------------------------------------------------------------------------------------------------------
Total distributions                                          $ (2.09)     $ (2.30)    $  (0.03)   $  (3.23)   $  (3.62)    $  (2.74)
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                   $ (2.77)     $ (0.67)    $   2.61    $  (2.23)   $  (4.59)    $   1.09
------------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                               $ 13.08      $ 15.85     $  16.52    $  13.91    $  16.14     $  20.73
====================================================================================================================================
Total return (c)                                               (3.93)%(d)   10.29%       18.98%       6.62%      (5.86)%      20.70%
Ratio of net expenses to average net assets                     1.87%(e)     1.84%        1.89%       1.90%       1.91%        1.88%
Ratio of net investment income (loss) to average net assets     0.94%(e)    (0.10)%       0.48%       0.38%       0.08%        0.04%
Portfolio turnover rate                                           52%(d)      112%         115%        129%        122%          66%
Net assets, end of period (in thousands)                     $34,244      $88,422     $103,022    $120,404    $162,238     $211,148
Ratios with no waiver of fees and assumption of expenses by
  the Adviser and no reduction for fees paid indirectly:
  Total expenses to average net assets                          1.87%(e)     1.84%        1.89%       1.90%       1.91%        1.88%
  Net investment income (loss) to average net assets            0.94%(e)    (0.10)%       0.48%       0.38%       0.08%        0.04%
====================================================================================================================================


*     The Fund was audited by an independent registered public accounting firm
      other than Ernst & Young LLP.

(a)   The per-share data presented above is based on the average shares
      outstanding for the period presented.

(b)   Amount rounds to less than $0.01 or $(0.01) per share.

(c)   Assumes initial investment at net asset value at the beginning of each
      period, reinvestment of all distributions, 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.

(d)   Not annualized.

(e)   Annualized.

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

30 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19





------------------------------------------------------------------------------------------------------------------------------------
                                                               Six Months
                                                               Ended         Year        Year        Year        Year       Year
                                                               2/28/19       Ended       Ended       Ended       Ended      Ended
                                                               (unaudited)   8/31/18     8/31/17     8/31/16*    8/31/15*   8/31/14*
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                          
Class R
Net asset value, beginning of period                           $ 15.63       $ 16.33     $ 13.77     $ 16.03     $ 20.60    $ 19.49
------------------------------------------------------------------------------------------------------------------------------------
Increase (decrease) from investment operations:
  Net investment income (loss)                                 $  0.10(a)    $  0.06(a)  $  0.15(a)  $  0.12(a)  $  0.10    $  0.11
  Net realized and unrealized gain (loss) on investments         (0.75)         1.62        2.53        0.94       (0.96)      3.78
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) from investment operations             $ (0.65)      $  1.68     $  2.68     $  1.06     $ (0.86)   $  3.89
------------------------------------------------------------------------------------------------------------------------------------
Distributions to shareowners:
  Net investment income                                        $ (0.10)      $ (0.11)    $ (0.12)    $ (0.12)    $ (0.09)   $ (0.07)
  Net realized gain                                              (2.09)        (2.27)         --       (3.20)      (3.62)     (2.71)
------------------------------------------------------------------------------------------------------------------------------------
Total distributions                                            $ (2.19)      $ (2.38)    $ (0.12)    $ (3.32)    $ (3.71)   $ (2.78)
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                     $ (2.84)      $ (0.70)    $  2.56     $ (2.26)    $ (4.57)   $  1.11
------------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                 $ 12.79       $ 15.63     $ 16.33     $ 13.77     $ 16.03    $ 20.60
====================================================================================================================================
Total return (b)                                                 (3.67)%(c)    10.77%      19.53%       7.13%      (5.32)%    21.25%
Ratio of net expenses to average net assets                       1.36%(d)      1.40%       1.40%       1.40%       1.40%      1.40%
Ratio of net investment income (loss) to average net assets       1.44%(d)      0.35%       0.97%       0.89%       0.59%      0.52%
Portfolio turnover rate                                             52%(c)       112%        115%        129%        122%        66%
Net assets, end of period (in thousands)                       $10,702       $11,275     $11,860     $12,888     $15,505    $21,012
Ratios with no waiver of fees and assumption of expenses by
  the Adviser and no reduction for fees paid indirectly:
  Total expenses to average net assets                            1.48%(d)      1.52%       1.54%       1.58%       1.53%      1.58%
  Net investment income (loss) to average net assets              1.32%(d)      0.23%       0.84%       0.71%       0.46%      0.34%
====================================================================================================================================


*     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)   Not annualized.

(d)   Annualized.

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

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 31



Financial Highlights (continued)



------------------------------------------------------------------------------------------------------------------------------------
                                                               Six Months
                                                               Ended        Year        Year        Year        Year       Year
                                                               2/28/19      Ended       Ended       Ended       Ended      Ended
                                                               (unaudited)  8/31/18     8/31/17     8/31/16*    8/31/15*   8/31/14*
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                         
Class Y
Net asset value, beginning of period                           $ 16.30      $  16.93    $  14.27    $  16.49    $  21.09   $  19.85
------------------------------------------------------------------------------------------------------------------------------------
Increase (decrease) from investment operations:
  Net investment income (loss)                                 $  0.13(a)   $   0.15(a) $   0.24(a) $   0.21(a) $   0.24   $   0.23
  Net realized and unrealized gain (loss) on investments         (0.79)         1.70        2.62        0.98       (1.03)      3.86
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) from investment operations             $ (0.66)     $   1.85    $   2.86    $   1.19    $  (0.79)  $   4.09
------------------------------------------------------------------------------------------------------------------------------------
Distributions to shareowners:
  Net investment income                                        $ (0.17)     $  (0.21)   $  (0.20)   $  (0.21)   $  (0.19)  $  (0.14)
  Net realized gain                                              (2.09)        (2.27)         --       (3.20)      (3.62)     (2.71)
------------------------------------------------------------------------------------------------------------------------------------
Total distributions                                            $ (2.26)     $  (2.48)   $  (0.20)   $  (3.41)   $  (3.81)  $  (2.85)
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                     $ (2.92)     $  (0.63)   $   2.66    $  (2.22)   $  (4.60)  $   1.24
------------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                 $ 13.38      $  16.30    $  16.93    $  14.27    $  16.49   $  21.09
====================================================================================================================================
Total return (b)                                                 (3.50)%(c)    11.42%      20.20%       7.80%      (4.85)%    21.97%
Ratio of net expenses to average net assets                       0.86%(d)      0.83%       0.84%       0.84%       0.85%      0.82%
Ratio of net investment income (loss) to average net assets       1.92%(d)      0.90%       1.54%       1.45%       1.12%      1.11%
Portfolio turnover rate                                             52%(c)       112%        115%        129%        122%        66%
Net assets, end of period (in thousands)                       $92,922      $116,296    $148,541    $109,037    $161,238   $276,563
Ratios with no waiver of fees and assumption of expenses by
  the Adviser and no reduction for fees paid indirectly:
  Total expenses to average net assets                            0.89%(d)      0.83%       0.84%       0.84%       0.85%      0.82%
  Net investment income (loss) to average net assets              1.89%(d)      0.90%       1.54%       1.45%       1.12%      1.11%
====================================================================================================================================


*     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)   Not annualized.

(d)   Annualized.

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

32 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



Notes to Financial Statements | 2/28/19 (unaudited)

1. Organization and Significant Accounting Policies

Pioneer Disciplined Value Fund (the "Fund") is a series of Pioneer Series Trust
III, a Delaware statutory trust. The Fund is registered under the Investment
Company Act of 1940 as a diversified, open-end management investment company.
The Fund's investment objective is to seek long-term capital growth.

The Fund offers five classes of shares designated as Class A, Class C, Class K,
Class R and Class Y shares. Class K shares had not commenced operations as of
February 28, 2019. Each class of shares represents an interest in the same
portfolio of investments of the Fund and has identical rights (based on relative
net asset values) to assets and liquidation proceeds. Share classes can bear
different rates of class-specific fees and expenses, such as transfer agent and
distribution fees. Differences in class-specific fees and expenses will result
in differences in net investment income and, therefore, the payment of different
dividends from net investment income earned by each class. The Amended and
Restated Declaration of Trust of the Fund gives the Board of Trustees the
flexibility to specify either per-share voting or dollar-weighted voting when
submitting matters for shareowner approval. Under per-share voting, each share
of a class of the Fund is entitled to one vote. Under dollar-weighted voting, a
shareowner's voting power is determined not by the number of shares owned, but
by the dollar value of the shares on the record date. Each share class has
exclusive voting rights with respect to matters affecting only that class,
including with respect to the distribution plan for that class. There is no
distribution plan for Class Y shares.

Amundi Pioneer Asset Management, Inc., an indirect wholly owned subsidiary of
Amundi and Amundi's wholly owned subsidiary, Amundi USA, Inc., serves as the
Fund's investment adviser (the "Adviser"). Amundi Pioneer Distributor, Inc., an
affiliate of Amundi Pioneer Asset Management, Inc., serves as the Fund's
distributor (the "Distributor").

In August 2018, the 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.

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

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 33



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.

      Fixed-income securities are valued by using prices supplied by independent
      pricing services, which consider such factors as market prices, market
      events, quotations from one or more brokers, Treasury spreads, yields,
      maturities and ratings, or may use a pricing matrix or other fair value
      methods or techniques to provide an estimated value of the security or
      instrument. A pricing matrix is a means of valuing a debt security on the
      basis of current market prices for other debt securities, historical
      trading patterns in the market for fixed-income securities and/or other
      factors. Non-U.S. debt securities that are listed on an exchange will be
      valued at the bid price obtained from an independent third party pricing
      service. When independent third party pricing services are unable to
      supply prices, or when prices or market quotations are considered to be
      unreliable, the value of that security may be determined using quotations
      from one or more broker-dealers.

      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.

34 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



      Inputs used when applying fair value methods to value a security may
      include credit ratings, the financial condition of the company, current
      market conditions and comparable securities. The Fund may use fair value
      methods if it is determined that a significant event has occurred after
      the close of the exchange or market on which the security trades and prior
      to the determination of the Fund's net asset value. Examples of a
      significant event might include political or economic news, corporate
      restructurings, natural disasters, terrorist activity or trading halts.
      Thus, the valuation of the Fund's securities may differ significantly from
      exchange prices, and such differences could be material.

      At February 28, 2019, no securities were valued using fair value methods
      (other than securities valued using prices supplied by independent pricing
      services, broker-dealers or using a third party insurance industry pricing
      model).

B.    Investment Income and Transactions

      Dividend income is recorded on the ex-dividend date, except that certain
      dividends from foreign securities where the ex-dividend date may have
      passed are recorded as soon as the Fund becomes aware of the ex-dividend
      data in the exercise of reasonable diligence.

      Interest income, including interest on income-bearing cash accounts, is
      recorded on the accrual basis. Dividend and interest income are reported
      net of unrecoverable foreign taxes withheld at the applicable country
      rates and net of income accrued on defaulted securities.

      Interest and dividend income payable by delivery of additional shares is
      reclassified as PIK (payment-in-kind) income upon receipt and is included
      in interest and dividend income, respectively.

      Security transactions are recorded as of trade date. Gains and losses on
      sales of investments are calculated on the identified cost method for both
      financial reporting and federal income tax purposes.

C.    Federal Income Taxes

      It is the Fund's policy to comply with the requirements of the Internal
      Revenue Code applicable to regulated investment companies and to
      distribute all of its net taxable income and net realized capital gains,
      if any, to its shareowners. Therefore, no provision for federal income
      taxes is required. As of August 31, 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.

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 35



      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.

      The tax character of current year distributions payable will be determined
      at the end of the current taxable year. The tax character of distributions
      paid during the year ended August 31, 2018 was as follows:



      --------------------------------------------------------------------------
                                                                           2018
      --------------------------------------------------------------------------
                                                                 
      Distributions paid from:
      Ordinary income                                               $21,696,742
      Long-term capital gain                                         58,043,215
      --------------------------------------------------------------------------
          Total                                                     $79,739,957
      ==========================================================================


      The following shows the components of distributable earnings (losses) on a
      federal income tax-basis at August 31, 2018:



      --------------------------------------------------------------------------
                                                                           2018
      --------------------------------------------------------------------------
                                                                 
      Distributable earnings:
      Undistributed ordinary income                                 $21,673,782
      Undistributed long-term capital gain                           40,818,561
      Net unrealized appreciation                                    34,402,291
      --------------------------------------------------------------------------
          Total                                                     $96,894,634
      ==========================================================================


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

D.    Fund Shares

      The Fund records sales and repurchases of its shares as of trade date. The
      Distributor earned $6,728 in underwriting commissions on the sale of Class
      A shares during the six months ended February 28, 2019.

E.    Class Allocations

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

      Distribution fees are calculated based on the average daily net asset
      value attributable to Class A, Class C and Class R shares of the Fund,
      respectively (see Note 4). Class Y shares do not pay distribution fees.
      All expenses and fees

36 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



      paid to the Fund's transfer agent for its services are allocated among the
      classes of shares based on the number of accounts in each class and the
      ratable allocation of related out-of-pocket expenses (see Note 3).

      Distributions to shareowners are recorded as of the ex-dividend date.
      Distributions paid by the Fund with respect to each class of shares are
      calculated in the same manner and at the same time, except that net
      investment income dividends to Class A, Class C, Class R and Class Y
      shares can reflect different transfer agent and distribution expense
      rates.

F.    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

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 37



      disruptions and impact business operations, potentially resulting in
      financial losses, interference with the Fund's ability to calculate its
      net asset value, impediments to trading, the inability of Fund shareowners
      to effect share purchases, redemptions or exchanges or receive
      distributions, loss of or unauthorized access to private shareowners
      information and violations of applicable privacy and other laws,
      regulatory fines, penalties, reputational damage, or additional compliance
      costs. Such costs and losses may not be covered under any insurance. In
      addition, maintaining vigilance against cyber-attacks may involve
      substantial costs over time, and system enhancements may themselves be
      subject to cyber-attacks.

      The Fund's prospectus contains unaudited information regarding the Fund's
      principal risks. Please refer to that document when considering the Fund's
      principal risks.

2. Management Agreement

The Adviser manages the Fund's portfolio. Management fees are calculated daily
at the annual rate to 0.65% of the Fund's average daily net assets up to $1
billion, 0.60% of the next $2 billion of the Fund's average daily net assets,
0.55% of the next $4.5 billion of the Fund's average daily net assets and 0.525%
of the Fund's average daily net assets over $7.5 billion. For the six months
ended February 28, 2019, the effective management fee (excluding waivers and/or
assumption of expenses) was equivalent to 0.65% (annualized) of the Fund's
average daily net assets.

Adviser contractually agreed to limit ordinary operating expenses prior to
January 1, 2019 (ordinary operating expenses means all fund expenses other than
extraordinary expenses, such as litigation, taxes, brokerage commissions and
acquired fund fees and expenses) of the Fund to the extent required to reduce
Fund expenses to 1.20%, 2.10%, 1.40% and 0.85% of the average daily net assets
attributable to Class A, Class C, Class R and Class Y shares, respectively. Fees
waived and expenses reimbursed during the six months ended February 28, 2019,
are reflected on the Statement of Operations. These expense limitations are no
longer in effect.

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
$23,761 in management fees, administrative costs and certain other
reimbursements payable to the Adviser at February 28, 2019.

38 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



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 six
months ended February 28, 2019, such out-of-pocket expenses by class of shares
were as follows:



--------------------------------------------------------------------------------
Shareowner Communications:
--------------------------------------------------------------------------------
                                                                     
Class A                                                                 $16,935
Class C                                                                   2,782
Class R                                                                     569
Class Y                                                                     389
--------------------------------------------------------------------------------
 Total                                                                  $20,675
================================================================================


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 $15,713 in distribution fees payable to the Distributor at
February 28, 2019.

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

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 39



In addition, redemptions of each class of shares (except 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 R or Class Y shares. Proceeds from the
CDSCs are paid to the Distributor. For the six months ended February 28, 2019,
CDSCs in the amount of $565 were paid to the Distributor.

5. Line of Credit Facility

The Fund, along with certain other funds in the Pioneer Family of Funds (the
"Funds"), participates in a committed, unsecured revolving line of credit
facility. Borrowings are used solely for temporary or emergency purposes. The
Fund may borrow up to the lesser of the amount available under the facility or
the limits set for borrowing by the Fund's prospectus and the 1940 Act. Prior to
August 1, 2018, the credit facility that was in the amount of $195 million.
Effective August 1, 2018 the Fund participates in a credit facility that is in
the amount of $250 million. Under such credit facility, depending on the type of
loan, interest on borrowings is payable at the London Interbank Offered Rate
("LIBOR") plus 0.90% on an annualized basis, or the Alternate Base Rate, which
is the greater of (a) the facility's administrative agent's daily announced
prime rate on the borrowing date, (b) 2% plus the Federal Funds Rate on the
borrowing date or (c) 2% plus the overnight Eurodollar rate on the borrowing
date. The Funds pay an annual commitment fee to participate in a credit
facility. The commitment fee is allocated among participating Funds based on an
allocation schedule set forth in the credit agreement. For the six months ended
February 28, 2019, the Fund had no borrowings under the credit facility.

40 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



Approval of Investment Management Agreement

Amundi Pioneer Asset Management, Inc. ("APAM") serves as the investment adviser
to Pioneer Disciplined Value Fund (the "Fund") pursuant to an investment
management agreement between APAM and the Fund. In order for APAM to remain the
investment adviser of the Fund, the Trustees of the Fund must determine annually
whether to renew the investment management agreement for the Fund.

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

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

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

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 41



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.

42 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



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 third quintile relative to the management fees paid by
other funds in its Morningstar category for the comparable period. The Trustees
considered that the expense ratio of the Fund's Class A shares for the most
recent fiscal year was in the fourth quintile relative to its Strategic Insight
peer group for the comparable period. The Trustees noted the impact of expenses
relating to small accounts and omnibus accounts on transfer and sub-transfer
agency expenses generally. The Trustees noted that APAM had agreed to waive fees
and/or reimburse expenses in order to limit the ordinary operating expenses of
the Fund.

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

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 43



the Fund's other service providers and activities related to compliance and the
extensive regulatory and tax regimes to which the Fund is subject. The Trustees
also considered the entrepreneurial risks associated with APAM's management of
the Fund.

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

Profitability

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

Economies of Scale

The Trustees considered APAM's views relating to economies of scale in
connection with the Pioneer Funds as fund assets grow and the extent to which
any such economies of scale are shared with the Fund and Fund shareholders. The
Trustees recognize that economies of scale are difficult to identify and
quantify, and that, among other factors that may be relevant, are the following:
fee levels, expense subsidization, investment by APAM in 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.

44 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



Other Benefits

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

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

Conclusion

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

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 45



Trustees, Officers and Service Providers

Trustees                                   Officers
Thomas J. Perna, Chairman                  Lisa M. Jones, President and
David R. Bock                                Chief Executive Officer
Benjamin M. Friedman                       Mark E. Bradley, Treasurer and
Margaret B.W. Graham                         Chief Financial Officer
Lisa M. Jones                              Christopher J. Kelley, Secretary and
Lorraine H. Monchak                          Chief Legal Officer
Marguerite A. Piret
Fred J. Ricciardi
Kenneth J. Taubes

Investment Adviser and Administrator
Amundi Pioneer Asset Management, Inc.

Custodian and Sub-Administrator
Brown Brothers Harriman & Co.

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.

46 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



                          This page is for your notes.

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 47



                          This page is for your notes.

48 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



                          This page is for your notes.

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 49



                          This page is for your notes.

50 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



                          This page is for your notes.

                 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19 51



                          This page is for your notes.

52 Pioneer Disciplined Value Fund | Semiannual Report | 2/28/19



How to Contact Amundi Pioneer

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

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

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

Retirement plans information                                      1-800-622-0176

Write to us:
--------------------------------------------------------------------------------
Amundi Pioneer
P.O. Box 219427
Kansas City, MO 64121-9427

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

Our internet e-mail address                us.askamundipioneer@amundipioneer.com
(for general questions about Amundi Pioneer only)
Visit our web site: www.amundipioneer.com

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 19126-13-0419




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.

N/A

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

N/A


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

N/A

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

N/A

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

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

                  SECTION I - POLICY PURPOSE AND APPLICABILITY

The Pioneer Funds recognize the importance of maintaining the independence of
their outside auditors. Maintaining independence is a shared responsibility
involving 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.

N/A


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

N/A

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

N/A.

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

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

ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS

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

N/A

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

N/A

ITEM 6. SCHEDULE OF INVESTMENTS.

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

Included in Item 1


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

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

Not applicable to open-end management investment companies.



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

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


Not applicable to open-end management investment companies.


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

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

Not applicable to open-end management investment companies.


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

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


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


ITEM 11. CONTROLS AND PROCEDURES.

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

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


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

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

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

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

Item 12. 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 III


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

Date April 29, 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 April 29, 2019


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

Date April 29, 2019

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