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                                 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 811-02864

                          Pioneer Bond Fund
               (Exact name of registrant as specified in charter)


                       60 State Street, Boston, MA 02109
              (Address of principal executive offices) (ZIP code)


            Terrence J. Cullen, Pioneer Investment Management, Inc.,
                       60 State Street, Boston, MA 02109
                    (Name and address of agent for service)


Registrant's telephone number, including area code:  (617) 742-7825


Date of fiscal year end:  June 30


Date of reporting period:  July 1, 2014 through June 30, 2015


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 Bond Fund

--------------------------------------------------------------------------------
                        Annual Report | June 30, 2015
--------------------------------------------------------------------------------

                        Ticker Symbols:

                        Class A     PIOBX
                        Class C     PCYBX
                        Class K     PBFKX
                        Class R     PBFRX
                        Class Y     PICYX
                        Class Z     PIBZX

                        [LOGO] PIONEER
                               Investments(R)


                      visit us: us.pioneerinvestments.com


Table of Contents


                                                                           
President's Letter                                                             2

Portfolio Management Discussion                                                4

Portfolio Summary                                                              9

Prices and Distributions                                                      10

Performance Update                                                            11

Comparing Ongoing Fund Expenses                                               17

Schedule of Investments                                                       19

Financial Statements                                                          67

Notes to Financial Statements                                                 77

Report of Independent Registered Public Accounting Firm                       89

Trustees, Officers and Service Providers                                      91


                                   Pioneer Bond Fund | Annual Report | 6/30/15 1


President's Letter

Dear Shareowner,

At mid-year, economic conditions and government policies around the world are
far from homogeneous, and we expect them to continue to diverge. In the United
States, an ongoing economic expansion has brought the unemployment rate down to
levels where wage growth is likely to accelerate. Economic growth and fiscal
austerity have dramatically reduced the Federal budget deficit, while very
accommodative Federal Reserve System policies have kept interest rates
exceptionally low. In Europe and Japan, cyclical economic recoveries/expansions
appear to be gaining traction, buttressed by aggressive quantitative easing
policies of central banks as well as cheaper currencies. China's ongoing
transition from an infrastructure investment-driven to a consumer-driven economy
and the dramatic decline in the price of oil -- largely a result of U.S.
"fracking" -- have benefited some countries while burdening others. On balance,
though, the global economic outlook has continued to improve, although economic
and geopolitical "storm clouds" remain.

Today's market environment presents numerous opportunities as well as challenges
for investors. While we believe that the capital markets may already have priced
in some recent trends, such as the U.S. dollar's appreciation against a basket
of global currencies, it is worth noting that investment risks and opportunities
are not always aligned with the economic outlook.

Since 1928, Pioneer's investment professionals have focused on identifying and
capitalizing on the investment opportunities that present themselves in a
variety of ever-changing economic and market conditions, including those we face
today, while seeking to limit the risk of the permanent impairment of our
clients' capital. Our ongoing goal is to deliver competitive returns consistent
with our strategies' stated style and objectives and consistent with our
shareholders' expectations over a range of market conditions. We believe our
shareowners benefit from the experience and tenure of our investment teams, the
insights generated from extensive research resources, and our commitment to
prudent risk management.

2 Pioneer Bond Fund | Annual Report | 6/30/15


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, as we do when managing the assets
our clients have entrusted to us.

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

Sincerely,

/s/ Lisa M. Jones

Lisa M. Jones
President and CEO
Pioneer Investment Management USA, Inc.

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. These statements should not
be relied upon for any other purposes. Past performance is no guarantee of
future results, and there is no guarantee that market forecasts discussed will
be realized.

                                   Pioneer Bond Fund | Annual Report | 6/30/15 3


Portfolio Management Discussion | 6/30/15

Longer-maturity Treasuries outperformed virtually all other fixed-income asset
classes during the 12-month period ended June 30, 2015, despite strengthening
performance from credit-sensitive debt during the final three months of the
period. In the following interview, Kenneth J. Taubes and Charles Melchreit
review the factors that affected the performance of Pioneer Bond Fund during the
12-month period ended June 30, 2015. Mr. Taubes, Executive Vice President, Chief
Investment Officer, U.S., and a portfolio manager at Pioneer Investments, is
responsible for the daily management of the Portfolio, along with Charles
Melchreit, Director of Investment-Grade Management, a senior vice president and
a portfolio manager at Pioneer.

Q    How did the Fund perform during the 12-month period ended June 30, 2015?

A    Pioneer Bond Fund's Class A shares returned 1.32% at net asset value during
     the 12-month period ended June 30, 2015, while the Fund's benchmark, the
     Barclays Aggregate Bond Index (the Barclays Index), returned 1.86%. During
     the same period, the average return of the 50 mutual funds in Lipper's
     Corporate Debt, A-rated Underlying Funds category was 0.99%, and the
     average return of the 1,043 mutual funds in Morningstar's Intermediate-Term
     Bond Funds category was 1.04%.

Q    How would you describe the investment environment in the fixed-income
     markets over the 12-month period ended June 30, 2015?

A    The distinguishing characteristic of the first nine months of the period
     was a brisk rally in interest rates, as longer-maturity rates declined and
     bond prices appreciated. During that time, longer-maturity U.S. Treasuries
     outperformed virtually all other fixed-income asset classes, while more
     credit-sensitive securities lagged in a market environment characterized by
     a flight to quality resulting from periodic bouts of market volatility. The
     volatility was spurred by investor anxieties over a number of issues,
     including: changes in expectations with regard to the monetary policies of
     the world's central banks, as the European Central Bank (ECB) initiated
     quantitative easing even as the Federal Reserve System (the Fed) ended it
     in the United States; a slowdown of economic growth in China; heightened
     geopolitical risks in the Middle East; a dramatic decline in world oil
     prices; a reduction in industrial capital investments as a consequence of
     the collapse of energy prices; and softness in consumer spending in the
     United States. Overall, however, the U.S. economy appeared to be
     strengthening

4 Pioneer Bond Fund | Annual Report | 6/30/15


     during the period, despite a disappointing gross domestic product report
     for the first quarter of 2015, as employment figures improved and the
     housing market continued to rebound.

     The general market shift into Treasuries received a boost from declining
     interest rates in Europe, which resulted from the aforementioned
     quantitative easing program launched by the ECB. Global investors saw
     superior value in U.S. Treasuries and that, in turn, contributed to the
     strengthening of the U.S. dollar in world currency markets.

     The trends we witnessed over the first nine months of the Fund's fiscal
     year began to change over the final three months of the 12-month period,
     beginning in April. In the United States, investors became more optimistic
     about economic growth as they focused on the improving employment figures
     and the ongoing revival in the housing market. Within the U.S., the yield
     curve began steepening as market interest rates started rising, widening
     the difference between yields of shorter-maturity and longer-maturity debt
     instruments. Longer-maturity Treasuries began to weaken somewhat, while
     other asset classes, including corporate bonds, bank loans and government
     agency mortgages, started to show improved performance.

     Despite the changes in market trends over the final three months of the
     period, for the full 12 months ended June 30, 2015, Treasuries were still
     among the top-performing asset classes, and the U.S. dollar continued to
     outperform other major currencies, including the euro and the Japanese yen.

Q    What were the main factors that affected the Fund's performance relative to
     the Barclays Index benchmark during the 12-month period ended June 30,
     2015?

A    The Fund underperformed the benchmark during the period, primarily because
     of the portfolio's shorter-duration stance, which, on average, was 1 1/2
     years less than that of the Barclays Index. (Duration is a measure of the
     sensitivity of the price - the value of principal - of a fixed-income
     investment to a change in interest rates, expressed as a number of years.)
     We maintained a short-duration stance in the Fund's portfolio because we
     believed the U.S. economy's fundamentals were inconsistent with the low
     Treasury yields we were seeing. Nevertheless, Treasury yields continued to
     decline over the first nine months of the Fund's fiscal year, while bond
     prices rose. The negative effects of the low-duration stance on benchmark-
     relative performance were partially offset by our concentration of the
     Fund's investments in both the shorter and longer maturity ranges, and our
     avoidance of the poor-performing intermediate-term maturity range.

                                   Pioneer Bond Fund | Annual Report | 6/30/15 5


     The Fund's benchmark-relative returns were helped by sector allocation
     decisions during the period, as the portfolio had helpful exposures to
     several groups that are not included in the Barclays Index, including
     non-government agency mortgages, floating-rate bank loans and insurance-
     linked securities. The allocations helped to diminish the negative impact
     on relative returns caused by a portfolio underweight to Treasuries and an
     overweight to industrial bonds, the performance of which was dragged down
     by weakness in the energy and basic materials markets. The performance of
     the Fund's industrials holdings also was held back by our emphasis on
     owning lower-rated credits, which underperformed in a market that favored
     higher-quality debt.

     Finally, good security selection results, particularly in the financials
     sector and among the Fund's holdings of government agency mortgages (where
     we emphasized owning securities with strong pre-payment protection),
     contributed to benchmark-relative returns over the 12-month period.

Q    What factors affected the Fund's distributions to shareholders over the
     12-month period ended June 30, 2015?

A    Market yields began to increase during the latter months of the Fund's
     fiscal year, after falling during the first half of the 12-month period. We
     believe we are beginning to see an increase in the Fund's potential to earn
     current income for distribution to shareholders. This is a welcome reversal
     of the trend we had seen over the previous six-month period ended December
     31, 2014, when lower market yields had resulted in a decline in the Fund's
     distributions to shareholders.

Q    Did the Fund use any derivative securities during the 12-month period ended
     June 30, 2015? If so, did they have any effect on the Fund's
     benchmark-relative performance?

A    Yes, we used Treasury futures as part of our strategy to maintain a low
     duration in the Fund's portfolio. As the direction of market rates changed,
     we did not see much of an impact on results for the 12-month period. The
     Fund also had some exposure to credit default swaps in an attempt to manage
     the risks associated with investments in credit-sensitive debt. The swaps
     exerted a very modest drag on the Fund's results.

6 Pioneer Bond Fund | Annual Report | 6/30/15


Q    What is your investment outlook?

A    While the U.S. economy appears to be gaining strength, we still see some
     uncertainty in the financial markets. The fiscal situation in Greece
     remains a concern and clouds the economic outlook for Europe, while recent
     volatility in Chinese equities has been a source of anxiety for the world
     capital markets.

     In the U.S., however, the economy appeared to be gathering strength during
     the second calendar quarter of 2015 after a very disappointing gross
     domestic product (GDP) report for the first quarter, when GDP actually
     declined at a 0.2% annual rate (later revised upward into positive
     territory, after period end). As employment continues to improve and the
     housing market rebounds, the Fed, clearly, is thinking about tightening
     monetary policy through an increase in short-term interest rates sometime
     in 2015.

     At the start of the second half of 2015, the financial markets remain
     volatile due to the many uncertainties we have outlined, even though we see
     more positive signs than negative ones when we examine economic
     fundamentals. We are maintaining a shorter-than-benchmark duration in the
     Fund's portfolio, as we think the risks of rising interest rates are
     increasing, while we have continued to overweight credit-sensitive
     securities, including corporate bonds, as they generally perform well
     during periods of economic growth. We also see attractive relative value in
     the mortgage sector, both in government agency mortgages and non-agency
     securities.

     Given the reality that the Fed is moving toward tighter monetary policies
     than those of other major central banks, we think the U.S. dollar should
     continue to be strong, and we have continued to de-emphasize non-dollar-
     denominated securities in the Portfolio. Going forward, we think individual
     security selection should become an increasingly important performance
     factor.

     At the end of the 12-month period, on June 30, 2015, U.S. investment-grade
     corporate bonds represented the largest allocation among the Fund's
     investments, followed by government agency mortgages and non-agency
     mortgages. Other notable portfolio allocations at period end included
     commercial mortgage-backed securities, U.S. Treasuries, international
     investment-grade securities, asset-backed securities, floating-rate bank
     loans and insurance-linked securities.

                                   Pioneer Bond Fund | Annual Report | 6/30/15 7


Please refer to the Schedule of Investments on pages 19-66 for a full listing of
Fund securities.

When interest rates rise, the prices of fixed-income securities in the Fund will
generally fall. Conversely, when interest rates fall, the prices of fixed-income
securities in the Fund will generally rise.

Investments in the Fund are subject to possible loss due to the financial
failure of the issuers of the underlying securities and their inability to meet
their debt obligations.

Prepayment risk is the chance that an issuer may exercise its right to prepay
its security, if falling interest rates prompt the issuer to do so. Forced to
reinvest the unanticipated proceeds at lower interest rates, the Fund would
experience a decline in income and lose the opportunity for additional price
appreciation.

Investments in high-yield or lower-rated securities are subject to greater-than-
average price volatility, illiquidity and possibility of default.

The securities issued by U.S. Government-sponsored entities (i.e., Fannie Mae,
Freddie Mac) are neither guaranteed nor issued by the U.S. Government.

The portfolio may invest in mortgage-backed securities, which during times of
fluctuating interest rates may increase or decrease more than other fixed-
income securities. Mortgage-backed securities are also subject to pre-payments.

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.

These risks may increase share price volatility.

Before investing, consider the product's investment objectives, risks, charges
and expenses. Contact your advisor or Pioneer Investments for a prospectus or
summary prospectus containing this information. Read it carefully.

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

8 Pioneer Bond Fund | Annual Report | 6/30/15


Portfolio Summary | 6/30/15

Portfolio Diversification*
--------------------------------------------------------------------------------
(As a percentage of total investment portfolio)

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



                                                                        
U.S. Corporate Bonds                                                       30.2%
U.S. Government Securities                                                 27.9%
Collateralized Mortgage Obligations                                        18.2%
International Corporate Bonds                                              10.4%
Asset Backed Securities                                                     5.2%
Senior Secured Loans                                                        3.2%
Municipal Bonds                                                             2.6%
U.S. Preferred Stocks                                                       1.2%
International Preferred Stocks                                              0.5%
Temporary Cash Investments                                                  0.4%
Convertible Preferred Stocks                                                0.2%


*    Includes investments in insurance linked securities totaling 3.2% of total
     investment portfolio.

10 Largest Holdings
--------------------------------------------------------------------------------
(As a percentage of total long-term holdings)*



                                                                        
 1.  U.S. Treasury Inflation Indexed Bonds, 0.125%, 7/15/24                2.06%
--------------------------------------------------------------------------------
 2.  U.S. Treasury Bonds, 4.5%, 2/15/36                                    1.24
--------------------------------------------------------------------------------
 3.  U.S. Treasury Bonds, 2.5%, 2/15/45                                    0.91
--------------------------------------------------------------------------------
 4.  Fannie Mae, 5.0%, 2/1/45                                              0.79
--------------------------------------------------------------------------------
 5.  Fannie Mae, 3.0%, 8/1/42                                              0.70
--------------------------------------------------------------------------------
 6.  Government National Mortgage Association I, 3.5%, 1/15/45             0.68
--------------------------------------------------------------------------------
 7.  Fannie Mae, 4.0%, 8/1/44                                              0.63
--------------------------------------------------------------------------------
 8.  U.S. Treasury Note, Floating Rate Note, 1/31/17                       0.54
--------------------------------------------------------------------------------
 9.  U.S. Treasury Note, Floating Rate Note, 4/30/17                       0.54
--------------------------------------------------------------------------------
10.  Fannie Mae, 4.5%, 12/1/43                                             0.53
--------------------------------------------------------------------------------


*    This list excludes temporary cash investments and derivative instruments.
     The Fund is actively managed, and current holdings may be different. The
     holdings listed should not be considered recommendations to buy or sell any
     security listed.

                                   Pioneer Bond Fund | Annual Report | 6/30/15 9


Prices and Distributions | 6/30/15

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



--------------------------------------------------------------------------------
         Class                         6/30/15                    6/30/14
--------------------------------------------------------------------------------
                                                             
          A                             $9.68                      $9.88
--------------------------------------------------------------------------------
          C                             $9.57                      $9.77
--------------------------------------------------------------------------------
          K                             $9.68                      $9.87
--------------------------------------------------------------------------------
          R                             $9.77                      $9.97
--------------------------------------------------------------------------------
          Y                             $9.59                      $9.79
--------------------------------------------------------------------------------
          Z                             $9.69                      $9.90
--------------------------------------------------------------------------------


Distributions per Share: 7/1/14-6/30/15
--------------------------------------------------------------------------------



--------------------------------------------------------------------------------
                      Net Investment         Short-Term      Long-Term
         Class            Income            Capital Gains   Capital Gains
--------------------------------------------------------------------------------
                                                      
          A              $0.2870               $   --          $0.0431
--------------------------------------------------------------------------------
          C              $0.2060               $   --          $0.0431
--------------------------------------------------------------------------------
          K              $0.3237               $   --          $0.0431
--------------------------------------------------------------------------------
          R              $0.2633               $   --          $0.0431
--------------------------------------------------------------------------------
          Y              $0.3117               $   --          $0.0431
--------------------------------------------------------------------------------
          Z              $0.3121               $   --          $0.0431
--------------------------------------------------------------------------------



Index Definition
--------------------------------------------------------------------------------
The Barclays Aggregate Bond Index is an unmanaged measure of the U.S. bond
market. Index returns are calculated monthly, assume reinvestment of dividends
and, unlike Fund returns, do not reflect any fees, expenses or sales charges. It
is not possible to invest directly in an index.

The index defined here pertains to the "Value of $10,000 Investment" and "Value
of $5 Million Investment" charts on pages 11-16.

10 Pioneer Bond Fund | Annual Report | 6/30/15


Performance Update | 6/30/15                                      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 Bond Fund at public offering price
during the periods shown, compared to that of the Barclays Aggregate Bond Index.



Average Annual Total Returns
(As of June 30, 2015)
--------------------------------------------------------------------------------
                                      Net             Public           Barclays
                                      Asset           Offering         Aggregate
                                      Value           Price            Bond
Period                                (NAV)           (POP)            Index
--------------------------------------------------------------------------------
                                                              
10 Years                              5.10%            4.62%           4.44%
5 Years                               4.72             3.77            3.35
1 Year                                1.32            -3.29            1.86
--------------------------------------------------------------------------------


Expense Ratio
(Per prospectus dated October 1, 2014)
--------------------------------------------------------------------------------
                                      Gross           Net
--------------------------------------------------------------------------------
                                                
                                      0.92%           0.85%
--------------------------------------------------------------------------------


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

Value of $10,000 Investment



                          Pioneer Bond Fund        Barclays Aggregate Bond Index
                                             
6/30/2005                 $  9,550                 $ 10,000
6/30/2006                 $  9,434                 $  9,919
6/30/2007                 $  9,935                 $ 10,527
6/30/2008                 $ 10,594                 $ 11,276
6/30/2009                 $ 10,874                 $ 11,958
6/30/2010                 $ 12,474                 $ 13,094
6/30/2011                 $ 13,357                 $ 13,605
6/30/2012                 $ 14,146                 $ 14,622
6/30/2013                 $ 14,600                 $ 14,521
6/30/2014                 $ 15,504                 $ 15,156
6/30/2015                 $ 15,709                 $ 15,438


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

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

NAV results represent the percent change in net asset value per share. Returns
would have been lower had sales charges been reflected. POP returns reflect
deduction of maximum 4.50% sales charge. All results are historical and assume
the reinvestment of dividends and capital gains. Other share classes are
available for which performance and expenses will differ.

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

The net expense ratio reflects the contractual expense limitation currently in
effect through November 1, 2015, for Class A shares. There can be no assurance
that Pioneer will extend the expense limitation beyond such time. Please see the
prospectus and financial statements for more information.

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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 11


Performance Update | 6/30/15                                      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 Bond Fund during the periods shown,
compared to that of the Barclays Aggregate Bond Index.



Average Annual Total Returns
(As of June 30, 2015)
--------------------------------------------------------------------------------
                                                                       Barclays
                                                                       Aggregate
                                      If              If               Bond
Period                                Held            Redeemed         Index
--------------------------------------------------------------------------------
                                                              
10 Years                              4.18%           4.18%            4.44%
5 Years                               3.82            3.82             3.35
1 Year                                0.49            0.49             1.86
--------------------------------------------------------------------------------


Expense Ratio
(Per prospectus dated October 1, 2014)
--------------------------------------------------------------------------------
                                      Gross
--------------------------------------------------------------------------------
                                   
                                      1.65%
--------------------------------------------------------------------------------


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

Value of $10,000 Investment



                          Pioneer Bond Fund        Barclays Aggregate Bond Index
                                             
6/30/2005                 $ 10,000                 $ 10,000
6/30/2006                 $  9,792                 $  9,919
6/30/2007                 $ 10,222                 $ 10,527
6/30/2008                 $ 10,814                 $ 11,276
6/30/2009                 $ 10,989                 $ 11,958
6/30/2010                 $ 12,487                 $ 13,094
6/30/2011                 $ 13,244                 $ 13,605
6/30/2012                 $ 13,922                 $ 14,622
6/30/2013                 $ 14,247                 $ 14,521
6/30/2014                 $ 14,987                 $ 15,156
6/30/2015                 $ 15,061                 $ 15,438


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

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

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

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

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

12 Pioneer Bond Fund | Annual Report | 6/30/15


Performance Update | 6/30/15                                      Class K Shares

Investment Returns
--------------------------------------------------------------------------------
The mountain chart on the right shows the change in value of a $10,000
investment made in Class K shares of Pioneer Bond Fund during the periods shown,
compared to that of the Barclays Aggregate Bond Index.



Average Annual Total Returns
(As of June 30, 2015)
--------------------------------------------------------------------------------
                                                      Net              Barclays
                                                      Asset            Aggregate
                                                      Value            Bond
Period                                                (NAV)            Index
--------------------------------------------------------------------------------
                                                                 
10 Years                                              5.18%            4.44%
5 Years                                               4.89             3.35
1 Year                                                1.80             1.86
--------------------------------------------------------------------------------


Expense Ratio
(Per prospectus dated October 1, 2014)
--------------------------------------------------------------------------------
                                      Gross
--------------------------------------------------------------------------------
                                   
                                      0.48%
--------------------------------------------------------------------------------


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

Value of $10,000 Investment



                          Pioneer Bond Fund        Barclays Aggregate Bond Index
                                             
6/30/2005                 $ 10,000                 $ 10,000
6/30/2006                 $  9,875                 $  9,919
6/30/2007                 $ 10,400                 $ 10,527
6/30/2008                 $ 11,090                 $ 11,276
6/30/2009                 $ 11,383                 $ 11,958
6/30/2010                 $ 13,058                 $ 13,094
6/30/2011                 $ 13,982                 $ 13,605
6/30/2012                 $ 14,809                 $ 14,622
6/30/2013                 $ 15,310                 $ 14,521
6/30/2014                 $ 16,285                 $ 15,156
6/30/2015                 $ 16,578                 $ 15,438


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

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

The performance shown for Class K shares for the period prior to the
commencement of operations of Class K shares on December 20, 2012, is the net
asset value performance of the Fund's Class A shares, which has not been
restated to reflect any differences in expenses, including Rule 12b-1 fees
applicable to Class A shares. Since fees for Class A shares generally are higher
than those of Class K shares, the performance of Class K shares prior to their
inception would have been higher than the performance shown. Class K shares are
not subject to sales charges and are available for limited groups of eligible
investors, including institutional investors. All results are historical and
assume the reinvestment of dividends and capital gains.

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.

                                  Pioneer Bond Fund | Annual Report | 6/30/15 13


Performance Update | 6/30/15                                      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 Bond Fund during the periods
shown, compared to that of the Barclays Aggregate Bond Index.



Average Annual Total Returns
(As of June 30, 2015)
--------------------------------------------------------------------------------
                                                      Net              Barclays
                                                      Asset            Aggregate
                                                      Value            Bond
Period                                                (NAV)            Index
--------------------------------------------------------------------------------
                                                                 
10 Years                                              4.74%            4.44%
5 Years                                               4.35             3.35
1 Year                                                1.06             1.86
--------------------------------------------------------------------------------


Expense Ratio
(Per prospectus dated October 1, 2014)
--------------------------------------------------------------------------------
                                      Gross           Net
--------------------------------------------------------------------------------
                                                
                                      1.24%           1.10%
--------------------------------------------------------------------------------


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

Value of $10,000 Investment



                          Pioneer Bond Fund        Barclays Aggregate Bond Index
                                             
6/30/2005                 $ 10,000                 $ 10,000
6/30/2006                 $  9,857                 $  9,919
6/30/2007                 $ 10,354                 $ 10,527
6/30/2008                 $ 10,991                 $ 11,276
6/30/2009                 $ 11,249                 $ 11,958
6/30/2010                 $ 12,844                 $ 13,094
6/30/2011                 $ 13,701                 $ 13,605
6/30/2012                 $ 14,466                 $ 14,622
6/30/2013                 $ 14,871                 $ 14,521
6/30/2014                 $ 15,725                 $ 15,156
6/30/2015                 $ 15,893                 $ 15,438



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

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

Class 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 net expense ratio reflects the contractual expense limitation currently in
effect through November 1, 2016, for Class R shares. There can be no assurance
that Pioneer will extend the expense limitation beyond such time. Please see the
prospectus and financial statements for more information.

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

14 Pioneer Bond Fund | Annual Report | 6/30/15


Performance Update | 6/30/15                                      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 Bond Fund during the periods shown,
compared to that of the Barclays Aggregate Bond Index.



Average Annual Total Returns
(As of June 30, 2015)
--------------------------------------------------------------------------------
                                                      Net              Barclays
                                                      Asset            Aggregate
                                                      Value            Bond
Period                                                (NAV)            Index
--------------------------------------------------------------------------------
                                                                 
10 Years                                              5.39%            4.44%
5 Years                                               4.95             3.35
1 Year                                                1.59             1.86
--------------------------------------------------------------------------------


Expense Ratio
(Per prospectus dated October 1, 2014)
--------------------------------------------------------------------------------
                                      Gross
--------------------------------------------------------------------------------
                                   
                                      0.58%
--------------------------------------------------------------------------------


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

Value of $5 Million Investment



                          Pioneer Bond Fund        Barclays Aggregate Bond Index
                                             
6/30/2005                 $ 5,000,000              $ 5,000,000
6/30/2006                 $ 4,961,201              $ 4,959,729
6/30/2007                 $ 5,241,647              $ 5,263,299
6/30/2008                 $ 5,604,041              $ 5,638,210
6/30/2009                 $ 5,769,357              $ 5,979,145
6/30/2010                 $ 6,638,193              $ 6,547,062
6/30/2011                 $ 7,119,503              $ 6,802,492
6/30/2012                 $ 7,566,089              $ 7,310,888
6/30/2013                 $ 7,818,536              $ 7,260,610
6/30/2014                 $ 8,319,878              $ 7,578,141
6/30/2015                 $ 8,451,829              $ 7,718,929


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

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

Class 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.

                                  Pioneer Bond Fund | Annual Report | 6/30/15 15


Performance Update | 6/30/15                                      Class Z Shares

Investment Returns
--------------------------------------------------------------------------------
The mountain chart on the right shows the change in value of a $10,000
investment made in Class Z shares of Pioneer Bond Fund during the periods shown,
compared to that of the Barclays Aggregate Bond Index.



Average Annual Total Returns
(As of June 30, 2015)
--------------------------------------------------------------------------------
                                                      Net              Barclays
                                                      Asset            Aggregate
                                                      Value            Bond
Period                                                (NAV)            Index
--------------------------------------------------------------------------------
                                                                 
10 Years                                              5.31%            4.44%
5 Years                                               4.92             3.35
1 Year                                                1.47             1.86
--------------------------------------------------------------------------------


Expense Ratio
(Per prospectus dated October 1, 2014)
--------------------------------------------------------------------------------
                                      Gross           Net
--------------------------------------------------------------------------------
                                                
                                      0.74%           0.65%
--------------------------------------------------------------------------------


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

Value of $10,000 Investment



                          Pioneer Bond Fund        Barclays Aggregate Bond Index
                                             
6/30/2005                 $ 10,000                 $ 10,000
6/30/2006                 $  9,875                 $  9,919
6/30/2007                 $ 10,400                 $ 10,527
6/30/2008                 $ 11,128                 $ 11,276
6/30/2009                 $ 11,509                 $ 11,958
6/30/2010                 $ 13,198                 $ 13,094
6/30/2011                 $ 14,161                 $ 13,605
6/30/2012                 $ 15,043                 $ 14,622
6/30/2013                 $ 15,556                 $ 14,521
6/30/2014                 $ 16,535                 $ 15,156
6/30/2015                 $ 16,777                 $ 15,438


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

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

Performance shown for periods prior to the inception of Class Z shares on July
6, 2007, reflects the NAV performance of the Fund's Class A shares. The
performance does not reflect differences in expenses, including the Rule 12b-1
fees applicable to Class A shares. Since fees for Class A shares are generally
higher than those of Class Z shares, the performance for Class Z shares prior to
their inception on July 6, 2007 would have been higher than that shown. Class Z
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 net expense ratio reflects the contractual expense limitation currently in
effect through November 1, 2015, for Class Z shares. There can be no assurance
that Pioneer will extend the expense limitation beyond such time. Please see the
prospectus and financial statements for more information.

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

16 Pioneer Bond Fund | Annual Report | 6/30/15


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 Bond Fund

Based on actual returns from January 1, 2015 through June 30, 2015.



--------------------------------------------------------------------------------
Share Class          A          C         K          R          Y          Z
--------------------------------------------------------------------------------
                                                     
Beginning       $1,000.00  $1,000.00  $1,000.00  $1,000.00  $1,000.00  $1,000.00
Account Value
on 1/1/15
--------------------------------------------------------------------------------
Ending Account  $1,013.20  $1,004.90  $1,018.00  $1,010.60  $1,015.90  $1,014.70
Value (after
expenses)
on 6/30/15
--------------------------------------------------------------------------------
Expenses Paid   $    4.22  $    8.07  $    2.34  $    5.45  $    2.88  $    3.23
During Period*
--------------------------------------------------------------------------------


*    Expenses are equal to the Fund's annualized net expense ratio of 0.85%,
     1.63%, 0.47%, 1.10%, 0.58%, and 0.65% for Class A, Class C, Class K, Class
     R, Class Y, and Class Z shares, respectively, multiplied by the average
     account value over the period, multiplied by 181/365 (to reflect the
     one-half year period).

                                  Pioneer Bond Fund | Annual Report | 6/30/15 17


Hypothetical Example for Comparison Purposes

The table below provides information about hypothetical account values and
hypothetical expenses based on the Fund's actual expense ratio and an assumed
rate of return of 5% per year before expenses, which is not the Fund's actual
return. The hypothetical account values and expenses may not be used to estimate
the actual ending account balance or expenses you paid for the period. You may
use this information to compare the ongoing costs of investing in the Fund and
other funds. To do so, compare this 5% hypothetical example with the 5%
hypothetical examples that appear in the shareholder reports of the other funds.

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

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

Based on a hypothetical 5% per year return before expenses, reflecting the
period from January 1, 2015 through June 30, 2015.



--------------------------------------------------------------------------------
Share Class         A          C          K          R          Y          Z
--------------------------------------------------------------------------------
                                                     
Beginning       $1,000.00  $1,000.00  $1,000.00  $1,000.00  $1,000.00  $1,000.00
Account Value
on 1/1/15
--------------------------------------------------------------------------------
Ending Account  $1,020.58  $1,016.71  $1,022.46  $1,019.34  $1,021.92  $1,021.57
Value (after
expenses)
on 6/30/15
--------------------------------------------------------------------------------
Expenses Paid   $    4.26  $    8.15  $    2.36  $    5.51  $    2.91  $    3.26
During Period*
--------------------------------------------------------------------------------


*    Expenses are equal to the Fund's annualized net expense ratio of 0.85%,
     1.63%, 0.47%, 1.10%, 0.58%, and 0.65% for Class A, Class C, Class K, Class
     R, Class Y, and Class Z shares, respectively, multiplied by the average
     account value over the period, multiplied by 181/365 (to reflect the
     one-half year period).

18 Pioneer Bond Fund | Annual Report | 6/30/15


Schedule of Investments | 6/30/15



------------------------------------------------------------------------------------------------------
                Floating
                Rate (b)
Shares          (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              PREFERRED STOCKS -- 1.2%
                              BANKS -- 0.5%
                              Diversified Banks -- 0.3%
      87,990          7.88    Citigroup Capital XIII, Floating Rate Note, 10/30/40   $       2,284,220
     197,000          7.12    Citigroup, Inc., Floating Rate Note (Perpetual)                5,391,890
      95,890          6.00    US Bancorp, Floating Rate Note (Perpetual)                     2,553,551
                                                                                     -----------------
                                                                                     $      10,229,661
------------------------------------------------------------------------------------------------------
                              Regional Banks -- 0.2%
      85,000                  BB&T Corp., 5.625% (Perpetual)                         $       2,051,050
      28,000          6.25    CoBank ACB, Floating Rate Note (Perpetual) (144A)              2,884,876
      17,380          6.62    Fifth Third Bancorp, Floating Rate Note (Perpetual)              490,116
                                                                                     -----------------
                                                                                     $       5,426,042
                                                                                     -----------------
                              Total Banks                                            $      15,655,703
------------------------------------------------------------------------------------------------------
                              DIVERSIFIED FINANCIALS -- 0.3%
                              Specialized Finance -- 0.1%
     167,900          5.75    SCE Trust III, Floating Rate Note (Perpetual)          $       4,469,498
------------------------------------------------------------------------------------------------------
                              Consumer Finance -- 0.0%+
       1,250                  Ally Financial, Inc., 7.0% (Perpetual) (144A)          $       1,269,336
------------------------------------------------------------------------------------------------------
                              Asset Management & Custody Banks -- 0.1%
      54,200          5.90    State Street Corp., Floating Rate Note, 12/31/73       $       1,391,314
------------------------------------------------------------------------------------------------------
                              Investment Banking & Brokerage -- 0.1%
     110,230          6.38    Morgan Stanley, Floating Rate Note (Perpetual)         $       2,806,456
                                                                                     -----------------
                              Total Diversified Financials                           $       9,936,604
------------------------------------------------------------------------------------------------------
                              INSURANCE -- 0.3%
                              Property & Casualty Insurance -- 0.3%
      50,000          5.95    Aspen Insurance Holdings, Ltd., Floating
                              Rate Note (Perpetual)                                  $       1,260,000
     153,800          7.38    Delphi Financial Group, Inc., Floating Rate
                              Note, 5/15/37                                                  3,854,612
     147,475          5.10    The Allstate Corp., Floating Rate Note, 1/15/53                3,697,198
                                                                                     -----------------
                                                                                     $       8,811,810
------------------------------------------------------------------------------------------------------
                              Reinsurance -- 0.0%+
   2,000,000                  Pangaea Re., Variable Rate Notes, 7/1/18 (g)           $          36,000
                                                                                     -----------------
                              Total Insurance                                        $       8,847,810
------------------------------------------------------------------------------------------------------
                              UTILITIES -- 0.1%
                              Electric Utilities -- 0.1%
     164,000                  PPL Capital Funding, Inc., 5.9%, 4/30/73               $       4,062,280
                                                                                     -----------------
                              Total Utilities                                        $       4,062,280
------------------------------------------------------------------------------------------------------
                              TOTAL PREFERRED STOCKS
                              (Cost $37,519,082)                                     $      38,502,397
------------------------------------------------------------------------------------------------------


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 19


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
                Rate (b)
Shares          (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                               

                              CONVERTIBLE PREFERRED STOCK -- 0.2%
                              BANKS -- 0.2%
                              Diversified Banks -- 0.2%
       5,610                  Wells Fargo & Co., 7.5% (Perpetual)                    $       6,591,750
------------------------------------------------------------------------------------------------------
                              TOTAL CONVERTIBLE PREFERRED STOCK
                              (Cost $5,839,986)                                      $       6,591,750
------------------------------------------------------------------------------------------------------


------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)
------------------------------------------------------------------------------------------------------
                                                                               
                              ASSET BACKED SECURITIES -- 5.1%
                              CONSUMER SERVICES -- 0.1%
                              Hotels, Resorts & Cruise Lines -- 0.1%
     843,904                  Westgate Resorts 2012-A LLC, 2.25%,
                              8/20/25 (144A)                                         $         845,592
     854,453                  Westgate Resorts 2012-A LLC, 3.75%,
                              8/20/25 (144A)                                                   863,478
   2,670,865                  Westgate Resorts 2015-1 LLC, 2.75%,
                              5/20/27 (144A)                                                 2,672,842
     153,667                  Westgate Resorts LLC, 2.5%, 3/20/25 (144A)                       154,074
                                                                                     -----------------
                                                                                     $       4,535,986
                                                                                     -----------------
                              Total Consumer Services                                $       4,535,986
------------------------------------------------------------------------------------------------------
                              FOOD & STAPLES RETAILING -- 0.1%
                              Food Retail -- 0.1%
   3,791,565                  CKE Restaurant Holdings, Inc., 4.474%,
                              3/20/43 (144A)                                         $       3,850,228
                                                                                     -----------------
                              Total Food & Staples Retailing                         $       3,850,228
------------------------------------------------------------------------------------------------------
                              HEALTH CARE EQUIPMENT & SERVICES -- 0.1%
                              Health Care Distributors -- 0.1%
   1,600,000                  OneMain Financial Issuance Trust 2015-1,
                              3.19%, 3/18/26 (144A)                                  $       1,622,736
                                                                                     -----------------
                              Total Health Care Equipment & Services                 $       1,622,736
------------------------------------------------------------------------------------------------------
                              BANKS -- 3.9%
                              Thrifts & Mortgage Finance -- 3.9%
   2,500,000                  Access Point Funding I 2015-A LLC, 2.61%,
                              4/15/20 (144A)                                         $       2,499,750
     161,712          6.49    ACE Securities Corp., Manufactured Housing
                              Trust Series 2003-MH1, Floating Rate Note,
                              8/15/30 (144A)                                                   162,229
   2,200,000          1.60    American Homes 4 Rent 2014-SFR1, Floating
                              Rate Note, 6/17/31 (144A)                                      2,187,515
   2,800,000                  American Homes 4 Rent 2014-SFR3 Trust,
                              4.596%, 12/18/36 (144A)                                        2,900,761
     700,000                  American Homes 4 Rent 2014-SFR3 Trust,
                              5.04%, 12/18/36 (144A)                                           730,056


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

20 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Thrifts & Mortgage Finance -- (continued)
   1,300,000                  American Homes 4 Rent 2015-SFR1, 4.11%,
                              4/17/45 (144A)                                         $       1,289,547
   2,600,000                  Applebee's Funding LLC/IHOP Funding LLC,
                              4.277%, 9/5/44 (144A)                                          2,635,357
   2,200,000                  Ascentium Equipment Receivables 2015-1 LLC,
                              3.24%, 1/10/22 (144A)                                          2,209,291
     700,000                  Axis Equipment Finance Receivables III LLC,
                              3.41%, 4/20/20 (144A)                                            696,730
   1,095,494                  B2R Mortgage Trust 2015-1, 2.524%, 5/15/48
                              (144A)                                                         1,089,677
     320,232          0.69    Bayview Financial Mortgage Pass-Through Trust
                              2005-C, Floating Rate Note, 6/28/44                              317,765
   1,462,628                  Bayview Financial Mortgage Pass-Through Trust
                              2006-A, 5.865%, 2/28/41 (Step)                                 1,515,955
   1,007,894          0.64    Bayview Financial Mortgage Pass-Through Trust
                              Series 2005-B, Floating Rate Note, 4/28/39                       999,777
   1,650,000                  BCC Funding X LLC, 3.622%, 11/20/20 (144A)                     1,654,125
   1,432,128          0.69    Bear Stearns Asset Backed Securities I Trust
                              2005-FR1, Floating Rate Note, 6/25/35                          1,425,168
     883,245          0.68    Bear Stearns Asset Backed Securities Trust
                              2006-SD2, Floating Rate Note, 6/25/36                            865,108
   2,775,208                  BXG Receivables Note Trust 2015-A, 2.88%,
                              5/2/30 (144A)                                                  2,768,593
   3,000,000                  Capital Automotive Real Estate Investment Trust,
                              3.66%, 10/17/44 (144A)                                         2,989,260
      60,062          0.58    Carrington Mortgage Loan Trust Series 2005-NC4,
                              Floating Rate Note, 9/25/35                                       59,666
     400,000          1.38    Chesapeake Funding LLC, Floating Rate Note, 3/4/26               398,506
   1,400,000                  CIT Equipment Collateral 2014-VT1, 2.65%,
                              10/20/22 (144A)                                                1,407,252
     618,859          4.00    Citigroup Mortgage Loan Trust 2014-A, Floating
                              Rate Note, 1/1/35 (144A)                                         643,025
   1,001,603          0.94    Citigroup Mortgage Loan Trust, Inc., Floating Rate
                              Note, 5/25/35 (144A)                                             996,618
   1,800,000          2.10    Colony American Homes 2014-1, Floating Rate
                              Note, 5/19/31 (144A)                                           1,783,449
   1,997,916                  Consumer Credit Origination Loan Trust 2015-1,
                              2.82%, 3/15/21 (144A)                                          2,009,732
   1,935,480          4.81    Countrywide Asset-Backed Certificates, Floating
                              Rate Note, 12/25/35                                            1,997,516
   1,000,000          0.49    Credit-Based Asset Servicing and Securitization
                              LLC, Floating Rate Note, 7/25/36                                 987,865
     610,393          1.24    CWABS Asset-Backed Certificates Trust 2004-7,
                              Floating Rate Note, 12/25/34                                     607,049
   4,987,500                  DB Master Finance LLC 2015-1, 3.98%,
                              2/21/45 (144A)                                                 4,967,395
   1,133,357          3.13    Drug Royalty II LP 2, Floating Rate Note,
                              7/15/23 (144A)                                                 1,148,595


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 21


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Thrifts & Mortgage Finance -- (continued)
     458,245          0.59    First NLC Trust 2005-2, Floating Rate Note, 9/25/35    $         457,365
     879,658                  GMAT 2013-1 Trust, 3.9669%, 8/25/53 (Step)                       881,737
     425,088          0.93    GSAMP Trust 2005-HE1, Floating Rate Note,
                              12/25/34                                                         416,867
   1,275,287          1.54    GSRPM Mortgage Loan Trust 2003-2, Floating
                              Rate Note, 6/25/33                                             1,228,255
     723,599          0.48    GSRPM Mortgage Loan Trust 2006-2, Floating
                              Rate Note, 9/25/36 (144A)                                        687,455
   1,620,000                  HLSS Servicer Advance Receivables Trust, 1.7436%,
                              1/16/46 (144A)                                                 1,618,380
     224,000                  HLSS Servicer Advance Receivables Trust, 3.96%,
                              10/15/45 (144A)                                                  223,798
   3,004,250                  HOA Funding LLC, 4.846%, 8/22/44 (144A)                        2,968,794
     348,312          0.57    Home Equity Asset Trust 2005-7, Floating Rate
                              Note, 1/25/36                                                    346,467
   1,052,124          1.39    HSBC Home Equity Loan Trust USA 2007-3, Floating
                              Rate Note, 11/20/36                                            1,046,678
   1,514,198                  Icon Brand Holdings LLC, 4.229%, 1/26/43 (144A)                1,516,885
     343,314                  Icon Brand Holdings LLC, 4.352%, 1/25/43 (144A)                  342,470
   1,700,000          1.38    Invitation Homes 2014-SFR3 Trust, Floating Rate
                              Note, 12/17/31 (144A)                                          1,684,236
     352,643                  Irwin Home Equity Loan Trust 2005-1, 5.32%,
                              6/25/35 (Step)                                                   348,669
   3,114,951          0.41    Irwin Home Equity Loan Trust 2005-1, Floating Rate
                              Note, 6/25/25                                                  2,901,075
     637,415          1.69    Irwin Whole Loan Home Equity Trust 2003-C, Floating
                              Rate Note, 6/25/28                                               630,042
     550,000                  Leaf Receivables Funding 10 LLC, 2.74%, 3/15/21
                              (144A)                                                           544,994
     552,742                  Leaf Receivables Funding 8 LLC, 1.55%, 11/15/17
                              (144A)                                                           553,278
   2,203,000                  Leaf Receivables Funding 8 LLC, 1.92%, 9/15/20
                              (144A)                                                         2,208,155
     270,900                  Lehman ABS Manufactured Housing Contract
                              Trust 2001-B, 3.01%, 5/15/41                                     272,238
     274,151                  Lehman ABS Manufactured Housing Contract
                              Trust 2001-B, 5.873%, 5/15/41                                    289,425
     345,086          2.44    Madison Avenue Manufactured Housing Contract
                              Trust 2002-A, Floating Rate Note, 3/25/32                        345,049
     949,015                  Nations Equipment Finance Funding II LLC, 3.276%,
                              1/22/19 (144A)                                                   956,009
     260,801          0.34    Nationstar Home Equity Loan Trust 2007-A, Floating
                              Rate Note, 3/25/37                                               254,922
     908,073          0.88    New Century Home Equity Loan Trust 2005-1, Floating
                              Rate Note, 3/25/35                                               900,495
   1,050,000                  NextGear Floorplan Master Owner Trust, 1.92%,
                              10/15/19 (144A)                                                1,053,554


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

22 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                              Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Thrifts & Mortgage Finance -- (continued)
   1,000,000                  NextGear Floorplan Master Owner Trust, 2.61%,
                              10/15/19 (144A)                                        $       1,004,597
     430,000          1.84    NovaStar Mortgage Funding Trust Series 2004-4,
                              Floating Rate Note, 3/25/35                                      422,875
     508,369          5.91    Origen Manufactured Housing Contract Trust
                              2004-A, Floating Rate Note, 1/15/35                              533,804
     358,040          5.46    Origen Manufactured Housing Contract Trust
                              2004-B, Floating Rate Note, 11/15/35                             364,583
   1,600,000                  Oxford Finance Funding Trust 2014-1, 3.475%,
                              12/15/22 (144A)                                                1,604,352
   1,000,000          1.04    PFS Financing Corp., Floating Rate Note,
                              10/15/19 (144A)                                                  996,886
   2,700,000                  Progreso Receivables Funding I LLC, 4.0%,
                              7/9/18 (144A)                                                  2,703,375
   3,200,000                  Progreso Receivables Funding III LLC, 3.625%,
                              2/8/20 (144A)                                                  3,200,000
   2,000,000                  Progreso Receivables Funding LLC, 3.0%, 7/28/20                2,000,000
     180,000          2.44    Progress Residential 2014-SFR1 Trust, Floating
                              Rate Note, 10/17/31 (144A)                                       180,731
   2,700,000          2.59    Progress Residential 2015-SFR1 Trust, Floating
                              Rate Note, 2/20/32 (144A)                                      2,715,684
     864,705          0.44    RAAC Series 2006-RP2 Trust, Floating Rate Note,
                              2/25/37 (144A)                                                   853,243
     227,289          2.66    SASCO Mortgage Pass-Through Certificates Series
                              2004-S4, Floating Rate Note, 12/25/34                            227,264
   3,360,000          2.24    Silver Bay Realty 2014-1 Trust, Floating Rate Note,
                              9/18/31 (144A)                                                 3,353,287
   1,093,574                  Skopos Auto Receivables Trust 2015-1, 3.1%,
                              12/15/23 (144A)                                                1,093,574
   1,938,332                  SpringCastle America Funding LLC, 2.7%, 5/25/23                1,950,330
   1,640,868                  Springleaf Funding Trust 2013-A, 2.58%,
                              9/15/21 (144A)                                                 1,647,008
   1,200,000                  Springleaf Funding Trust 2014-A, 2.41%,
                              12/15/22 (144A)                                                1,201,500
     565,000          2.66    Springleaf Mortgage Loan Trust 2012-3, Floating
                              Rate Note, 12/26/59 (144A)                                       567,462
   1,398,833                  Store Master Funding I LLC, 3.75%, 4/20/45 (144A)              1,378,278
     289,268                  STORE Master Funding LLC, 4.16%, 3/20/43 (144A)                  296,216
   2,010,839                  STORE Master Funding LLC, 5.77%, 8/20/42 (144A)                2,157,389
   1,098,011          0.39    Structured Asset Investment Loan Trust 2006-1,
                              Floating Rate Note, 1/25/36                                    1,067,366
   1,554,441          0.41    Structured Asset Securities Corp., Mortgage Loan
                              Trust 2006-GEL4, Floating Rate Note,
                              10/25/36 (144A)                                                1,542,316
      79,224                  Structured Asset Securities Corp., 4.77%,
                              10/25/34 (Step)                                                   82,182


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 23


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Thrifts & Mortgage Finance -- (continued)
   1,709,071                  Sunset Mortgage Loan Co., 2014-NPL2 LLC,
                              3.721%, 11/16/44 (Step) (144A)                         $       1,702,645
     528,007                  SVO 2012-A VOI Mortgage LLC, 2.0%,
                              9/20/29 (144A)                                                   522,530
     771,441          1.13    Terwin Mortgage Trust Series TMTS 2003-8HE,
                              Floating Rate Note, 12/25/34                                     750,553
     400,378                  Terwin Mortgage Trust Series TMTS 2005-12ALT,
                              4.98598%, 7/25/36 (Step)                                         406,152
   2,578,253                  Terwin Mortgage Trust Series TMTS 2005-16HE,
                              4.35892%, 9/25/36 (Step)                                       2,656,170
     800,000          2.44    Trafigura Securitisation Finance Plc, 2014-1,
                              Floating Rate Note, 10/15/21 (144A)                              801,518
   2,140,000                  United Auto Credit Securitization Trust 2015-1,
                              2.92%, 6/17/19 (144A)                                          2,144,575
   3,845,763                  US Residential Opportunity Fund III Trust 2015-1,
                              3.7213%, 1/29/35 (144A)                                        3,846,540
   1,749,792                  VOLT XXXI LLC, 3.375%, 2/25/55 (Step) (144A)                   1,745,145
   3,856,371                  VOLT XXXIII LLC, 3.5%, 3/25/55 (Step) (144A)                   3,857,628
   1,938,000                  Welk Resorts 2015-A LLC, 2.79%, 6/16/31 (144A)                 1,938,310
                                                                                     -----------------
                                                                                     $     124,136,692
                                                                                     -----------------
                              Total Banks                                            $     124,136,692
------------------------------------------------------------------------------------------------------
                              DIVERSIFIED FINANCIALS -- 0.9%
                              Other Diversified Financial Services -- 0.3%
     499,944                  AXIS Equipment Finance Receivables II LLC,
                              4.94%, 7/20/18 (144A)                                  $         512,648
   2,900,000                  Capital Auto Receivables Asset Trust 2013-1,
                              1.74%, 10/22/18                                                2,907,882
     612,985                  CNH Equipment Trust 2013-A, 0.69%, 6/15/18                       613,381
     667,209                  Mid-State Capital Trust 2010-1, 5.25%,
                              12/15/45 (144A)                                                  697,365
   1,017,039                  Sierra Timeshare 2012-2 Receivables Funding
                              LLC, 2.38%, 3/20/29 (144A)                                     1,026,603
     197,953                  Sierra Timeshare 2012-3 Receivables Funding
                              LLC, 1.87%, 8/20/29 (144A)                                       198,549
   3,300,000                  Spirit Master Funding LLC, 4.6291%,
                              1/20/45 (144A)                                                 3,288,972
     267,623                  Spirit Master Funding LLC, 5.74%, 3/20/42 (144A)                 290,780
     700,000                  Spirit Master Funding VII LLC, 3.8868%, 12/21/43                 716,653
                                                                                     -----------------
                                                                                     $      10,252,833
------------------------------------------------------------------------------------------------------
                              Specialized Finance -- 0.3%
   3,914,279                  Domino's Pizza Master Issuer LLC, 5.216%,
                              1/27/42 (144A)                                         $       4,040,401
   2,920,000                  Hercules Capital Funding Trust 2014-1, 3.524%,
                              4/16/21 (144A)                                                 2,925,475


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

24 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Specialized Finance -- (continued)
     660,979                  JG Wentworth XXII LLC, 3.82%, 12/15/48 (144A)          $         694,721
                                                                                     -----------------
                                                                                     $       7,660,597
------------------------------------------------------------------------------------------------------
                              Consumer Finance -- 0.2%
     800,000                  AmeriCredit Automobile Receivables Trust 2013-1,
                              1.57%, 1/8/19                                          $         801,206
     243,637                  California Republic Auto Receivables Trust 2012-1,
                              1.18%, 8/15/17 (144A)                                            243,937
     129,775                  First Investors Auto Owner Trust 2012-2, 1.47%,
                              5/15/18 (144A)                                                   129,902
   1,200,000                  First Investors Auto Owner Trust 2013-1, 2.02%,
                              1/15/19 (144A)                                                 1,200,431
   2,100,000                  First Investors Auto Owner Trust 2014-3, 2.97%,
                              11/16/20 (144A)                                                2,111,071
     510,000                  First Investors Auto Owner Trust 2015-1, 3.59%,
                              1/18/22 (144A)                                                   506,652
     588,352                  Santander Drive Auto Receivables Trust 2012-1,
                              3.78%, 11/15/17                                                  592,073
     850,000                  Santander Drive Auto Receivables Trust 2012-5,
                              2.7%, 8/15/18                                                    859,570
                                                                                     -----------------
                                                                                     $       6,444,842
------------------------------------------------------------------------------------------------------
                              Asset Management & Custody Banks -- 0.0%+
     831,842                  Horizon Funding Trust 2013-1, 3.0%,
                              5/15/18 (144A)                                         $         835,741
------------------------------------------------------------------------------------------------------
                              Investment Banking & Brokerage -- 0.1%
   1,600,000          1.93    Chesapeake Funding LLC, Floating Rate Note,
                              2/7/27 (144A)                                          $       1,601,584
                                                                                     -----------------
                              Total Diversified Financials                           $      26,795,597
------------------------------------------------------------------------------------------------------
                              TOTAL ASSET BACKED SECURITIES
                              (Cost $160,143,023)                                    $     160,941,239
------------------------------------------------------------------------------------------------------
                              COLLATERALIZED MORTGAGE
                              OBLIGATIONS -- 17.6%
                              CONSUMER SERVICES -- 0.1%
                              Hotels, Resorts & Cruise Lines -- 0.1%
   2,706,389                  Westgate Resorts 2014-1 LLC, 2.15%,
                              12/20/26 (144A)                                        $       2,706,389
                                                                                     -----------------
                              Total Consumer Services                                $       2,706,389
------------------------------------------------------------------------------------------------------
                              BANKS -- 16.3%
                              Thrifts & Mortgage Finance -- 16.3%
     390,823                  A10 Securitization 2013-1 LLC, 2.4%,
                              11/17/25 (144A)                                        $         391,925
   2,028,820                  A10 Term Asset Financing 2013-2 LLC, 2.62%,
                              11/15/27 (144A)                                                2,040,502


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 25


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Thrifts & Mortgage Finance -- (continued)
   8,490,073          3.50    Agate Bay Mortgage Trust 2015-1, Floating Rate
                              Note, 1/25/45 (144A)                                   $       8,468,186
   6,398,334          3.50    Agate Bay Mortgage Trust 2015-2, Floating Rate
                              Note, 3/25/45 (144A)                                           6,556,041
     416,799          0.64    Alternative Loan Trust 2003-14T1, Floating Rate
                              Note, 8/25/18                                                    399,108
   1,528,055                  Alternative Loan Trust 2003-21T1, 5.75%, 12/25/33              1,598,688
     143,748                  Alternative Loan Trust 2004-4CB, 4.25%, 4/25/34                  145,058
   9,407,000          1.09    Alternative Loan Trust 2004-J5, Floating Rate
                              Note, 8/25/34                                                  8,679,030
   4,200,000          1.93    Arbor Realty Collateralized Loan Obligation
                              2015-FL1, Ltd., Floating Rate Note, 3/15/25 (144A)             4,200,000
   2,580,000          2.39    BAMLL Commercial Mortgage Securities Trust
                              2014-FL1, Floating Rate Note, 12/17/31 (144A)                  2,584,910
   1,600,000          2.14    BAMLL Commercial Mortgage Securities Trust
                              2014-INLD, Floating Rate Note, 12/17/29                        1,604,067
   4,200,000          1.90    BAMLL Commercial Mortgage Securities Trust
                              2015-ASHF, Floating Rate Note, 1/18/28 (144A)                  4,200,089
     608,106                  Banc of America Alternative Loan Trust 2003-2,
                              5.75%, 4/25/33                                                   630,060
   1,197,579                  Banc of America Alternative Loan Trust 2004-6,
                              5.0%, 7/25/19                                                  1,230,546
   3,477,221          5.37    Banc of America Commercial Mortgage Trust
                              2006-1, Floating Rate Note, 9/10/45                            3,494,976
     612,532                  Banc of America Funding 2003-3 Trust, 5.5%,
                              10/25/33                                                         634,979
      25,199          0.31    Banc of America Funding 2010-R4 Trust REMICS,
                              Floating Rate Note, 8/26/36 (144A)                                25,165
   1,082,648          2.71    Banc of America Mortgage 2003-F Trust, Floating
                              Rate Note, 7/25/33                                             1,089,163
     781,482                  Banc of America Mortgage Trust 2004-11, 5.75%,
                              1/25/35                                                          798,939
     901,590                  Banc of America Mortgage Trust 2004-9, 5.5%,
                              11/25/34                                                         917,137
   5,813,066                  Bayview Commercial Asset Trust 2007-4,
                              3.49%, 9/25/37 (Step) (144A) (c)                                 197,644
   1,308,405          1.19    Bayview Commercial Asset Trust 2008-1, Floating
                              Rate Note, 1/25/38 (144A)                                      1,306,837
   2,228,842          0.89    Bear Stearns ALT-A Trust 2004-12, Floating Rate
                              Note, 1/25/35                                                  2,163,608
   1,633,817          0.89    Bear Stearns ALT-A Trust 2004-12, Floating Rate
                              Note, 1/25/35                                                  1,579,729
   2,647,992          0.79    Bear Stearns ALT-A Trust 2004-4, Floating Rate
                              Note, 6/25/34                                                  2,535,219
     936,870          0.75    Bear Stearns ALT-A Trust 2005-1, Floating Rate
                              Note, 1/25/35                                                    911,455


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

26 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Thrifts & Mortgage Finance -- (continued)
   3,093,773          2.60    Bear Stearns ARM Trust 2003-6, Floating Rate
                              Note, 8/25/33                                          $       3,074,654
   1,000,000          5.21    Bear Stearns Commercial Mortgage Securities
                              Trust 2005-PWR7, Floating Rate Note, 2/11/41                     999,736
   2,050,256          5.77    Bear Stearns Commercial Mortgage Securities
                              Trust 2006-TOP22, Floating Rate Note, 4/12/38                  2,089,451
   1,685,668          0.89    Bella Vista Mortgage Trust 2004-1, Floating Rate
                              Note, 11/20/34                                                 1,499,297
   2,210,000          2.14    BLCP Hotel Trust, Floating Rate Note,
                              8/15/29 (144A)                                                 2,216,345
   2,460,000          2.04    Carefree Portfolio Trust 2014-CARE, Floating Rate
                              Note, 11/15/29 (144A)                                          2,470,172
   3,990,000          2.69    CDGJ Commercial Mortgage Trust 2014-BXCH,
                              Floating Rate Note, 12/15/27 (144A)                            3,999,480
     468,209          2.60    CHL Mortgage Pass-Through Trust 2003-56,
                              Floating Rate Note, 12/25/33                                     470,815
   5,000,000                  Citigroup Commercial Mortgage Trust 2014-GC25
                              REMICS, 3.371%, 10/10/47                                       5,140,285
     468,382          1.18    Citigroup Mortgage Loan Trust 2010-7 REMICS,
                              Floating Rate Note, 9/25/37 (144A)                               468,180
   2,981,269          2.24    Citigroup Mortgage Loan Trust, Inc., REMICS,
                              Floating Rate Note, 8/25/34                                    2,954,584
   1,048,497                  Citigroup Mortgage Loan Trust, Inc., 5.5%, 9/25/34             1,126,727
   1,000,000          4.65    City Center Trust 2011-CCHP, Floating Rate Note,
                              7/17/28 (144A)                                                 1,000,594
     443,990          0.63    CNL Commercial Mortgage Loan Trust 2003-2,
                              Floating Rate Note, 10/25/30 (144A)                              385,674
   3,155,141                  Colony Multifamily Mortgage Trust 2014-1,
                              2.5432%, 4/22/50 (144A)                                        3,154,002
     450,000                  COMM 2012-CCRE2 Mortgage Trust REMICS,
                              3.791%, 8/17/45                                                  470,418
     850,000                  COMM 2012-CCRE2 Mortgage Trust, 3.147%,
                              8/15/45                                                          865,933
     915,000                  COMM 2012-CCRE4 Mortgage Trust, 2.436%,
                              10/17/45                                                         917,071
   4,000,000                  COMM 2012-LC4 Mortgage Trust, 4.063%,
                              12/12/44                                                       4,254,704
   4,200,000          5.17    COMM 2013-CCRE11 Mortgage Trust, Floating
                              Rate Note, 12/8/50 (144A)                                      4,471,454
   1,900,000                  COMM 2013-LC6 Mortgage Trust, 2.941%, 1/12/46                  1,898,432
   3,800,000          2.34    COMM 2014-FL5 Mortgage Trust, Floating Rate
                              Note, 10/17/31 (144A)                                          3,795,246
   4,150,000          1.94    COMM 2014-SAVA Mortgage Trust, Floating Rate
                              Note, 6/15/34 (144A)                                           4,143,439
   1,750,000                  COMM 2015-CCRE23 Mortgage Trust, 3.807%,
                              5/12/48 (144A)                                                 1,779,430
   3,850,000                  Commercial Mortgage Pass-Through Certificates,
                              2.822%, 10/17/45                                               3,833,703


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 27


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Thrifts & Mortgage Finance -- (continued)
   1,319,265          2.13    Commercial Mortgage Pass-Through Certificates,
                              Floating Rate Note, 11/19/26 (144A)                    $       1,318,887
   2,360,130                  Credit Suisse Commercial Mortgage Trust Series
                              2007-C1, 5.361%, 2/15/40                                       2,467,197
     180,802                  Credit Suisse First Boston Mortgage Securities
                              Corp., 5.5%, 6/25/33                                             183,255
   2,736,297          5.23    Credit Suisse First Boston Mortgage Securities
                              Corp., Floating Rate Note, 12/17/40                            2,742,929
     533,859          2.78    Credit Suisse First Boston Mortgage Securities
                              Corp., Floating Rate Note, 6/25/34                               517,984
   2,700,000          2.44    Credit Suisse Mortgage Capital Certificates,
                              Floating Rate Note, 3/15/28 (144A)                             2,688,266
   7,146,516          1.55    CSMC Trust 2013-IVR2, Floating Rate Note,
                              4/27/43 (144A)                                                 6,685,480
   3,201,995          3.00    CSMC Trust 2013-IVR4, Floating Rate Note,
                              7/27/43 (144A)                                                 3,204,781
   2,365,882          3.00    CSMC Trust 2013-IVR4, Floating Rate Note,
                              7/27/43 (144A)                                                 2,385,652
   6,565,759          3.00    CSMC Trust 2014-WIN1, Floating Rate Note,
                              9/25/44 (144A)                                                 6,621,673
   9,396,127                  CSMC Trust 2015-2, 3.0%, 2/25/45                               9,537,069
   1,900,000          5.42    DBUBS 2011-LC3 Mortgage Trust, Floating Rate
                              Note, 8/12/44 (144A)                                           2,158,970
   1,895,000          1.49    Del Coronado Trust 2013-DEL, Floating Rate
                              Note, 3/16/26 (144A)                                           1,893,179
   4,085,597          3.50    EverBank Mortgage Loan Trust REMICS, Floating
                              Rate Note, 4/25/43 (144A)                                      4,074,345
     191,663          1.28    Extended Stay America Trust 2013-ESH, Floating
                              Rate Note, 12/5/31 (144A)                                        190,593
   4,630,000          3.38    GAHR Commercial Mortgage Trust 2015-NRF,
                              Floating Rate Note, 12/15/34 (144A)                            4,596,956
     842,113                  Global Mortgage Securitization, Ltd., 5.25%, 4/25/32             813,680
   2,154,984          0.46    Global Mortgage Securitization, Ltd., Floating
                              Rate Note, 4/25/32                                             2,071,325
   2,800,000                  GS Mortgage Securities Corp., Trust 2012-SHOP,
                              2.933%, 6/6/31 (144A)                                          2,876,121
   1,250,000                  GS Mortgage Securities Corp., II, 3.377%, 5/10/45              1,295,909
   1,000,000                  GS Mortgage Securities Corp., II, 3.682%,
                              2/10/46 (144A)                                                 1,002,827
     812,364                  GS Mortgage Securities Corp., II, 5.56%, 11/10/39                842,195
     930,735          2.45    GSR Mortgage Loan Trust 2003-9, Floating Rate
                              Note, 8/25/33                                                    926,482
   1,670,191          2.82    GSR Mortgage Loan Trust 2004-7, Floating Rate
                              Note, 6/25/34                                                  1,628,287
     928,696          2.64    GSR Mortgage Loan Trust 2005-AR1, Floating Rate
                              Note, 1/25/35                                                    934,179
   2,340,000          1.29    Homestar Mortgage Acceptance Corp., Floating
                              Rate Note, 1/25/35                                             2,280,388


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

28 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Thrifts & Mortgage Finance -- (continued)
   1,809,878          0.54    Homestar Mortgage Acceptance Corp., Floating
                              Rate Note, 6/25/34                                     $       1,781,995
   2,100,000          1.89    Hyatt Hotel Portfolio Trust 2015-HYT, Floating
                              Rate Note, 11/15/29 (144A)                                     2,103,965
     529,697          0.99    Impac CMB Trust Series 2004-6, Floating Rate
                              Note, 10/25/34                                                   503,757
     264,967          0.53    Impac Secured Assets Trust 2006-2, Floating
                              Rate Note, 8/25/36                                               261,299
   1,033,178          0.39    Impac Secured Assets Trust 2006-5, Floating
                              Rate Note, 12/25/36                                              971,443
   3,910,234                  JP Morgan Chase Commercial Mortgage Securities
                              Corp., 2.84%, 12/17/47                                         3,897,803
   2,800,000          5.13    JP Morgan Chase Commercial Mortgage Securities
                              Trust 2005-LDP3, Floating Rate Note, 8/15/42                   2,799,110
   4,800,000          5.56    JP Morgan Chase Commercial Mortgage Securities
                              Trust 2006-LDP6, Floating Rate Note, 4/15/43                   4,888,147
     402,224          0.34    JP Morgan Chase Commercial Mortgage Securities
                              Trust 2006-LDP9, Floating Rate Note, 5/15/47                     398,840
   1,600,000                  JP Morgan Chase Commercial Mortgage Securities
                              Trust 2010-C2, 3.6159%, 11/15/43 (144A)                        1,670,771
   1,350,000                  JP Morgan Chase Commercial Mortgage Securities
                              Trust 2011-C5, 4.1712%, 8/17/46                                1,464,782
   1,200,000          3.98    JP Morgan Chase Commercial Mortgage Securities
                              Trust 2012-C8, Floating Rate Note, 10/17/45 (144A)             1,245,614
   5,000,000                  JP Morgan Chase Commercial Mortgage Securities
                              Trust 2014-C20 REMICS, 3.8046%, 7/15/47                        5,198,555
   4,600,000          2.14    JP Morgan Chase Commercial Mortgage Securities
                              Trust 2014-CBM, Floating Rate Note,
                              10/15/29 (144A)                                                4,583,932
   2,200,000          2.39    JP Morgan Chase Commercial Mortgage Securities
                              Trust 2014-FL4 REMICS, Floating Rate Note,
                              12/16/30 (144A)                                                2,196,968
     900,000          2.29    JP Morgan Chase Commercial Mortgage Securities
                              Trust 2014-FL5 REMICS, Floating Rate Note,
                              7/15/31 (144A)                                                   896,804
   1,260,000          1.54    JP Morgan Chase Commercial Mortgage Securities
                              Trust 2014-FL5, Floating Rate Note, 7/15/31 (144A)             1,263,523
   4,600,000          2.44    JP Morgan Chase Commercial Mortgage Securities
                              Trust 2015-COSMO, Floating Rate Note,
                              1/15/32 (144A)                                                 4,586,292
     423,188          2.49    JP Morgan Mortgage Trust 2003-A1, Floating Rate
                              Note, 10/25/33                                                   421,885
   1,569,010          2.51    JP Morgan Mortgage Trust 2004-A1, Floating Rate
                              Note, 2/25/34                                                  1,601,283
     505,193          2.49    JP Morgan Mortgage Trust 2004-A1, Floating Rate
                              Note, 2/25/34                                                    512,646
     759,006                  JP Morgan Mortgage Trust 2004-S1, 5.0%, 9/25/34                  786,253
   1,657,984                  JP Morgan Mortgage Trust 2004-S1, 6.0%, 9/25/34                1,747,367


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 29


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Thrifts & Mortgage Finance -- (continued)
   6,120,456          3.00    JP Morgan Mortgage Trust 2013-1, Floating Rate
                              Note, 3/25/43 (144A)                                   $       5,961,630
   5,451,046          2.50    JP Morgan Mortgage Trust 2013-1, Floating Rate
                              Note, 3/25/43 (144A)                                           5,387,590
   1,822,120          3.54    JP Morgan Mortgage Trust 2013-1, Floating Rate
                              Note, 3/25/43 (144A)                                           1,806,865
   1,485,537          3.50    JP Morgan Mortgage Trust 2013-2, Floating Rate
                              Note, 5/25/43 (144A)                                           1,493,312
     862,796          3.50    JP Morgan Mortgage Trust 2014-1 REMICS, Floating
                              Rate Note, 1/25/44 (144A)                                        871,378
   8,382,688          3.00    JP Morgan Mortgage Trust 2014-2, Floating Rate
                              Note, 6/25/29 (144A)                                           8,516,945
   7,677,897          3.43    JP Morgan Mortgage Trust 2014-2, Floating Rate
                              Note, 6/25/29 (144A)                                           7,848,359
   5,352,903          3.00    JP Morgan Mortgage Trust 2014-5, Floating Rate
                              Note, 10/25/29 (144A)                                          5,455,363
   2,452,388          3.04    JP Morgan Mortgage Trust 2014-5, Floating Rate
                              Note, 10/25/29 (144A)                                          2,404,183
   5,885,953          0.00    JP Morgan Mortgage Trust, 2014-OAK4-B1, Floating
                              Rate Note, 9/25/44 (f)                                         5,868,555
     469,971          2.50    La Hipotecaria Panamanian Mortgage Trust 2010-1,
                              Floating Rate Note, 9/8/39 (144A)                                487,736
   3,995,339          3.26    La Hipotecaria Panamanian Mortgage Trust 2014-1,
                              Floating Rate Note, 11/24/42 (144A)                            4,095,222
     177,179                  LB-UBS Commercial Mortgage Trust 2004-C1,
                              4.568%, 1/15/31                                                  179,104
     220,827          1.13    Lehman Brothers Small Balance Commercial
                              Mortgage Trust 2007-3 Class 1A4, Floating Rate
                              Note, 10/25/37 (144A)                                            219,599
   2,177,781          0.43    Lehman Brothers Small Balance Commercial,
                              Floating Rate Note, 2/25/30 (144A)                             2,058,262
     445,193          0.43    Lehman Brothers Small Balance Commercial,
                              Floating Rate Note, 9/25/30 (144A)                               419,855
   3,690,000          0.00    LSTAR Commercial Mortgage Trust 2015-3, Floating
                              Rate Note, 4/20/48 (144A) (d)                                  3,566,226
   4,609,206          2.18    LSTAR Securities Investment Trust 2014-2, Floating
                              Rate Note, 11/1/19 (144A)                                      4,575,907
   4,820,132          2.18    LSTAR Securities Investment Trust 2015-1, Floating
                              Rate Note, 1/1/20 (144A)                                       4,767,713
   2,449,047          2.18    LSTAR Securities Investment Trust 2015-3, Floating
                              Rate Note, 3/1/20 (144A)                                       2,437,659
   5,516,857          2.18    LSTAR Securities Investment Trust 2015-4, Floating
                              Rate Note, 4/1/20 (144A)                                       5,449,618
   2,848,138          2.18    LSTAR Securities Investment Trust 2015-5, Floating
                              Rate Note, 4/1/20 (144A)                                       2,837,099
     543,066          2.86    MASTR Adjustable Rate Mortgages Trust, Floating
                              Rate Note, 1/25/35                                               540,735
   2,207,925                  MASTR Alternative Loan Trust 2004-6, 6.0%, 7/25/34             2,247,056


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

30 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Thrifts & Mortgage Finance -- (continued)
     524,257          0.67    Mellon Residential Funding Corp., Mortgage
                              Pass-Through Trust Series 2000 TBC2, Floating
                              Rate Note, 6/15/30                                     $         497,545
     747,661          0.63    Mellon Residential Funding Corp., Mortgage
                              Pass-Through Trust Series 2000-TBC3, Floating
                              Rate Note, 12/15/30                                              712,793
     235,821          2.35    Merrill Lynch Mortgage Investors Trust Series
                              2005-2, Floating Rate Note, 10/25/35                             237,387
   2,972,582          0.46    Merrill Lynch Mortgage Investors Trust Series
                              2005-A3, Floating Rate Note, 4/25/35                           2,850,905
   1,821,224          0.75    Merrill Lynch Mortgage Investors Trust Series
                              MLCC 2004-G, Floating Rate Note, 1/25/30                       1,711,150
   3,212,768          5.29    Merrill Lynch Mortgage Trust 2005-LC1, Floating
                              Rate Note, 1/12/44                                             3,228,736
   2,241,153          5.65    ML-CFC Commercial Mortgage Trust 2006-1,
                              Floating Rate Note, 2/12/39                                    2,271,218
   3,263,268          0.97    MortgageIT Trust 2004-1, Floating Rate Note,
                              11/25/34                                                       3,118,819
   4,056,322          3.75    New Residential Mortgage Loan Trust 2014-1,
                              Floating Rate Note, 1/25/54 (144A)                             4,172,799
   4,015,026          3.75    New Residential Mortgage Loan Trust 2014-2,
                              Floating Rate Note, 5/26/54 (144A)                             4,147,188
   3,379,110          3.75    New Residential Mortgage Loan Trust 2014-3,
                              Floating Rate Note, 11/25/54 (144A)                            3,465,118
  11,695,000          0.00    New Residential Mortgage Loan Trust 2015-1,
                              Floating Rate Note, 4/25/52 (144A) (d)                        11,896,154
   6,326,690          3.32    NRP Mortgage Trust 2013-1, Floating Rate
                              Note, 7/25/43                                                  6,253,332
   3,771,126          3.32    NRP Mortgage Trust 2013-1, Floating Rate
                              Note, 7/25/43 (144A)                                           3,671,772
   4,975,951          3.25    NRP Mortgage Trust 2013-1, Floating Rate
                              Note, 7/25/43 (144A)                                           4,895,326
   5,220,783          3.25    NRP Mortgage Trust 2013-1, Floating Rate
                              Note, 7/25/43 (144A)                                           5,321,915
   6,511,679          0.58    Opteum Mortgage Acceptance Corp., Trust 2005-4,
                              Floating Rate Note, 11/25/35                                   5,998,461
     745,975                  ORES 2014-LV3 LLC, 3.0%, 3/27/24 (144A)                          745,975
     116,908                  PHH Mortgage Capital LLC, 6.600001%,
                              12/25/27 (Step) (144A)                                           117,098
     337,124                  RAAC Series 2004-SP2 Trust, 6.0%, 1/25/32                        343,149
     946,266          0.73    RALI Series 2003-QS13 Trust, Floating Rate
                              Note, 7/25/33                                                    873,765
     346,509                  RALI Series 2003-QS14 Trust, 5.0%, 7/25/18                       351,328
     886,965                  RALI Series 2004-QS3 Trust, 5.0%, 3/25/19                        907,125
   3,151,428          1.84    RESI Finance LP 2003-CB1, Floating Rate
                              Note, 7/9/35                                                   2,984,944


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 31


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Thrifts & Mortgage Finance -- (continued)
     483,011                  Residential Asset Securitization Trust 2004-A8,
                              5.25%, 11/25/34                                        $         489,429
   1,130,756                  Residential Asset Securitization Trust 2004-A9,
                              5.75%, 12/25/34                                                1,165,810
     783,185                  RFMSI Series 2005-S5 Trust, 5.25%, 7/25/35                       808,145
   4,000,000                  RREF 2015-LT7 LLC, 3.0%, 12/25/32 (144A)                       3,996,868
   2,890,298          0.85    Sequoia Mortgage Trust 2003-2, Floating Rate
                              Note, 6/20/33                                                  2,751,431
   5,566,931          1.81    Sequoia Mortgage Trust 2012-6, Floating Rate
                              Note, 12/26/42                                                 5,063,085
   3,177,255          1.45    Sequoia Mortgage Trust 2013-1, Floating Rate
                              Note, 2/25/43                                                  3,067,687
   7,061,569          3.59    Sequoia Mortgage Trust 2013-10, Floating Rate
                              Note, 8/25/43 (144A)                                           6,877,544
   7,560,287          3.54    Sequoia Mortgage Trust 2013-3, Floating Rate
                              Note, 3/25/43                                                  7,581,917
   7,992,370          2.33    Sequoia Mortgage Trust 2013-4 REMICS, Floating
                              Rate Note, 4/27/43                                             7,396,867
   4,491,103          3.51    Sequoia Mortgage Trust 2013-4, Floating Rate
                              Note, 4/25/43                                                  4,472,694
  12,030,370          2.50    Sequoia Mortgage Trust 2013-7, Floating Rate
                              Note, 6/25/43                                                 11,236,679
   1,573,846          3.00    Sequoia Mortgage Trust 2013-7, Floating Rate
                              Note, 6/25/43                                                  1,516,794
     728,341          2.25    Sequoia Mortgage Trust 2013-8, Floating Rate
                              Note, 6/25/43                                                    701,853
     777,703          3.00    Sequoia Mortgage Trust 2013-8, Floating Rate
                              Note, 6/25/43                                                    749,997
   6,397,420          3.56    Sequoia Mortgage Trust 2013-8, Floating Rate
                              Note, 6/25/43                                                  6,414,891
   1,820,253                  Sequoia Mortgage Trust 2013-9, 3.5%,
                              7/27/43 (144A)                                                 1,825,799
   7,043,883          3.00    Sequoia Mortgage Trust 2015-1, Floating Rate
                              Note, 1/25/45 (144A)                                           6,850,507
   8,657,691          3.50    Sequoia Mortgage Trust 2015-2, Floating Rate
                              Note, 5/25/45 (144A)                                           8,672,574
      50,829          3.00    Sequoia Mortgage Trust, Floating Rate Note,
                              9/25/42                                                           49,304
   1,093,633          2.22    Springleaf Mortgage Loan Trust 2012-2, Floating
                              Rate Note, 10/25/57 (144A)                                     1,096,340
     750,000          3.79    Springleaf Mortgage Loan Trust 2013-1, Floating
                              Rate Note, 6/25/58 (144A)                                        755,066
   1,533,923          2.00    Springleaf Mortgage Loan Trust 2013-1, Floating
                              Rate Note, 6/25/58 (144A)                                      1,535,537
     664,050          2.59    Structured Adjustable Rate Mortgage Loan Trust,
                              Floating Rate Note, 1/25/35                                      659,252


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

32 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Thrifts & Mortgage Finance -- (continued)
     525,334          2.46    Structured Adjustable Rate Mortgage Loan Trust,
                              Floating Rate Note, 11/25/34                           $         518,184
   3,954,307          0.87    Structured Asset Mortgage Investments II Trust
                              2004-AR8, Floating Rate Note, 5/19/35                          3,843,417
   2,045,110          0.93    Structured Asset Mortgage Investments Trust
                              2003-AR2, Floating Rate Note, 12/19/33                         1,960,958
   4,207,144                  Structured Asset Securities Corp., Trust 2005-17,
                              5.5%, 10/25/35                                                 4,329,189
     569,211          2.56    Structured Asset Securities Corp., Mortgage
                              Certificates Series 2003-31A, Floating Rate
                              Note, 10/25/33                                                   563,886
     678,993          0.48    Structured Asset Securities Corp., Trust 2005-14,
                              Floating Rate Note, 7/25/35                                      596,659
     738,105          2.16    Thornburg Mortgage Securities Trust 2003-3,
                              Floating Rate Note, 6/25/43                                      733,460
   5,451,526          0.93    Thornburg Mortgage Securities Trust 2004-3,
                              Floating Rate Note, 9/25/34                                    5,224,525
   4,470,000                  TimberStar Trust I REMICS, 5.668%, 10/15/36 (144A)             4,682,017
   1,435,000                  TimberStar Trust I, 5.7467%, 10/15/36 (144A)                   1,495,851
   5,040,000                  UBS Commercial Mortgage Trust 2012-C1,
                              3.4%, 5/12/45                                                  5,212,585
   2,272,971          2.19    Velocity Commercial Capital Loan Trust 2014-1,
                              Floating Rate Note, 9/25/44 (144A)                             2,261,606
   1,770,802                  VFC 2015-3 LLC, 2.75%, 12/20/31 (144A)                         1,768,810
   2,065,969                  VOLT XXX LLC, 3.625%, 10/25/57 (Step)                          2,064,438
   1,233,457          1.01    Wells Fargo Alternative Loan 2005-2 Trust,
                              Floating Rate Note, 10/25/35                                   1,228,495
   2,513,687                  Wells Fargo Commercial Mortgage Trust 2010-C1,
                              3.349%, 11/18/43 (144A)                                        2,576,001
   1,927,000                  Wells Fargo Commercial Mortgage Trust 2012-LC5
                              REMICS, 3.539%, 10/17/45                                       1,983,731
   4,500,000                  Wells Fargo Commercial Mortgage Trust 2014-LC16
                              REMICS, 3.477%, 8/17/50                                        4,681,764
   5,300,000          2.04    Wells Fargo Commercial Mortgage Trust 2014-TISH
                              REMICS, Floating Rate Note, 2/16/27 (144A)                     5,269,737
     350,000          5.39    WF-RBS Commercial Mortgage Trust 2011-C2,
                              Floating Rate Note, 2/15/44 (144A)                               381,800
   1,323,000          5.47    WF-RBS Commercial Mortgage Trust 2011-C2,
                              Floating Rate Note, 2/15/44 (144A)                             1,418,134
                                                                                     -----------------
                                                                                     $     516,385,820
                                                                                     -----------------
                              Total Banks                                            $     516,385,820
------------------------------------------------------------------------------------------------------
                              DIVERSIFIED FINANCIALS -- 0.2%
                              Other Diversified Financial Services -- 0.2%
   2,385,601          0.44    GE Business Loan Trust 2005-1, Floating Rate
                              Note, 6/15/33 (144A)                                   $       2,312,549
   2,015,577          0.36    GE Business Loan Trust 2007-1, Floating Rate
                              Note, 4/16/35 (144A)                                           1,911,113


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 33


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Other Diversified Financial Services -- (continued)
   1,000,000                  Morgan Stanley Capital I Trust 2007-HQ13,
                              5.569%, 12/15/44                                       $       1,061,142
                                                                                     -----------------
                                                                                     $       5,284,804
                                                                                     -----------------
                              Total Diversified Financials                           $       5,284,804
------------------------------------------------------------------------------------------------------
                              Government -- 1.0%
   1,250,000          4.30    Federal Home Loan Mortgage Corp., Floating Rate
                              Note, 9/26/44 (144A)                                   $       1,298,206
       3,023                  Federal National Mortgage Association REMICS,
                              10.3%, 4/25/19                                                     3,326
     649,508                  Federal National Mortgage Association REMICS,
                              4.5%, 6/25/29                                                    697,090
     313,644                  Federal National Mortgage Association REMICS,
                              5.0%, 7/25/33                                                    315,002
      75,154                  Federal National Mortgage Association REMICS,
                              5.0%, 9/25/39                                                     77,572
   1,330,472          1.54    Freddie Mac Structured Agency Credit Risk Debt
                              Notes, Floating Rate Note, 8/25/24                             1,330,243
     850,000          5.62    FREMF Mortgage Trust 2010-K7, Floating Rate
                              Note, 5/25/29 (144A)                                             951,131
     600,000          5.41    FREMF Mortgage Trust 2010-K8, Floating Rate
                              Note, 9/25/43 (144A)                                             666,954
     890,000          5.36    FREMF Mortgage Trust 2010-K9 REMICS, Floating
                              Rate Note, 9/25/45 (144A)                                        988,599
   1,500,000          4.78    FREMF Mortgage Trust 2011-K10 , Floating Rate
                              Note, 11/25/49 (144A)                                          1,625,508
   5,380,000          4.93    FREMF Mortgage Trust 2011-K702, Floating Rate
                              Note, 4/25/44 (144A)                                           5,739,319
   1,250,000          5.05    FREMF Mortgage Trust 2011-K703, Floating Rate
                              Note, 7/25/44 (144A)                                           1,339,785
     900,000          3.30    FREMF Mortgage Trust 2013-K502, Floating Rate
                              Note, 3/27/45 (144A)                                             914,338
   3,000,000          3.16    FREMF Mortgage Trust 2013-K713, Floating Rate
                              Note, 4/25/46 (144A)                                           3,022,392
   2,401,000          3.08    FREMF Mortgage Trust 2014-K503, Floating Rate
                              Note, 10/25/47 (144A)                                          2,418,028
     650,000          3.55    FREMF Mortgage Trust Class B, Floating Rate
                              Note, 11/25/46 (144A)                                            663,728
   2,010,000          3.95    FREMF Mortgage Trust Class B, Floating Rate
                              Note, 6/25/47 (144A)                                           2,085,992
   5,816,157                  Government National Mortgage Association
                              REMICS, 2.1%, 2/16/48                                          5,852,420
   1,482,422                  Government National Mortgage Association,
                              3.0%, 4/20/41                                                  1,538,455
      17,081                  Government National Mortgage Association,
                              4.973%, 4/16/42                                                   17,077


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

34 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                               
                              Government -- (continued)
     753,231                  Government National Mortgage Association,
                              5.25%, 8/16/35                                         $         845,517
                                                                                     -----------------
                                                                                     $      32,390,682
                                                                                     -----------------
                              Total Government                                       $      32,390,682
------------------------------------------------------------------------------------------------------
                              TOTAL COLLATERALIZED MORTGAGE OBLIGATIONS
                              (Cost $558,504,024)                                    $     556,767,695
------------------------------------------------------------------------------------------------------
                              CORPORATE BONDS -- 39.3%
                              ENERGY -- 4.9%
                              Oil & Gas Drilling -- 0.4%
   4,725,000                  Ensco Plc, 4.5%, 10/1/24                               $       4,514,062
   1,025,000                  Pride International, Inc., 6.875%, 8/15/20                     1,172,262
   6,185,000                  Rowan Companies, Inc., 4.75%, 1/15/24                          5,910,485
                                                                                     -----------------
                                                                                     $      11,596,809
------------------------------------------------------------------------------------------------------
                              Oil & Gas Equipment & Services -- 0.4%
   2,250,000                  Halliburton Co., 7.6%, 8/15/96 (144A)                  $       3,010,885
   6,050,000                  Helmerich & Payne International Drilling Co.,
                              4.65%, 3/15/25 (144A)                                          6,245,342
     675,000                  Weatherford International, Ltd., Bermuda,
                              5.95%, 4/15/42                                                   570,576
   2,815,000                  Weatherford International, Ltd., Bermuda,
                              9.625%, 3/1/19                                                 3,286,721
                                                                                     -----------------
                                                                                     $      13,113,524
------------------------------------------------------------------------------------------------------
                              Integrated Oil & Gas -- 0.6%
  4,175,000                   BP Capital Markets Plc, 3.062%, 3/17/22                $       4,164,116
  5,350,000                   ConocoPhillips Co., 3.35%, 11/15/24                            5,294,082
  1,000,000                   Rosneft Finance SA, 7.875%, 3/13/18 (144A)                     1,045,000
 10,050,000                   Sinopec Group Overseas Development 2015,
                              Ltd., 2.5%, 4/28/20 (144A)                                     9,898,647
                                                                                     -----------------
                                                                                     $      20,401,845
------------------------------------------------------------------------------------------------------
                              Oil & Gas Exploration & Production -- 0.4%
   1,500,000                  Approach Resources, Inc., 7.0%, 6/15/21                $       1,350,000
   2,230,000                  Canadian Natural Resources, Ltd., 6.5%, 2/15/37                2,533,224
   1,800,000                  EP Energy LLC, 9.375%, 5/1/20                                  1,923,660
     901,000                  Marathon Oil Corp., 5.9%, 3/15/18                                989,470
   2,360,000                  Newfield Exploration Co., 5.375%, 1/1/26                       2,336,400
   1,400,000                  Newfield Exploration Co., 5.625%, 7/1/24                       1,414,000
     483,747                  Ras Laffan Liquefied Natural Gas Co., Ltd., III,
                              5.832%, 9/30/16 (144A)                                           499,517
                                                                                     -----------------
                                                                                     $      11,046,271
------------------------------------------------------------------------------------------------------


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 35


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Oil & Gas Refining & Marketing -- 0.6%
   7,040,000                  EnLink Midstream Partners LP, 4.4%, 4/1/24             $       7,058,945
   3,800,000                  Motiva Enterprises LLC, 6.85%, 1/15/40 (144A)                  4,333,056
   2,825,000                  Valero Energy Corp., 6.625%, 6/15/37                           3,190,586
   2,890,000                  Valero Energy Corp., 9.375%, 3/15/19                           3,556,683
                                                                                     -----------------
                                                                                     $      18,139,270
------------------------------------------------------------------------------------------------------
                              Oil & Gas Storage & Transportation -- 2.2%
   5,550,000                  Boardwalk Pipelines LP, 4.95%, 12/15/24                $       5,442,680
   5,425,000                  Buckeye Partners LP, 4.15%, 7/1/23                             5,287,585
   2,900,000                  DCP Midstream LLC, 9.75%, 3/15/19 (144A)                       3,365,215
   3,950,000          5.85    DCP Midstream LLC, Floating Rate Note,
                              5/21/43 (144A)                                                 3,130,375
     500,000                  Energy Transfer Partners LP, 4.05%, 3/15/25                      471,495
   1,200,000          3.30    Energy Transfer Partners LP, Floating Rate
                              Note, 11/1/66                                                  1,020,000
   3,825,000                  Enterprise Products Operating LLC, 3.7%, 2/15/26               3,703,606
   5,310,000                  Enterprise Products Operating LLC, 3.9%, 2/15/24               5,332,052
   4,675,000                  Kinder Morgan Energy Partners LP, 4.25%, 9/1/24                4,553,146
   3,250,000                  Kinder Morgan Energy Partners LP, 5.95%, 2/15/18               3,551,506
   5,300,000                  Plains All American Pipeline LP, 4.9%, 2/15/45                 4,996,957
   3,500,000                  Sabine Pass LNG LP, 6.5%, 11/1/20                              3,622,500
   2,475,000                  Spectra Energy Capital LLC, 6.2%, 4/15/18                      2,703,873
   1,500,000                  Spectra Energy Capital LLC, 6.75%, 7/15/18                     1,676,988
   5,825,000                  Sunoco Logistics Partners Operations LP,
                              4.25%, 4/1/24                                                  5,656,291
   2,200,000                  Sunoco Logistics Partners Operations LP,
                              6.1%, 2/15/42                                                  2,254,529
   5,980,000                  The Williams Companies, Inc., 5.75%, 6/24/44                   5,549,279
   2,475,000                  The Williams Companies, Inc., 7.75%, 6/15/31                   2,762,474
   4,425,000                  TransCanada PipeLines, Ltd., 1.875%, 1/12/18                   4,454,249
                                                                                     -----------------
                                                                                     $      69,534,800
------------------------------------------------------------------------------------------------------
                              Other Diversified Financial Services -- 0.3%
   5,275,000                  CNOOC Nexen Finance 2014 ULC,
                              4.25%, 4/30/24                                         $       5,387,083
   4,750,000                  Sinopec Group Overseas Development 2014, Ltd.,
                              4.375%, 4/10/24 (144A)                                         4,981,895
                                                                                     -----------------
                                                                                     $      10,368,978
                                                                                     -----------------
                              Total Energy                                           $     154,201,497
------------------------------------------------------------------------------------------------------
                              MATERIALS -- 2.4%
                              Commodity Chemicals -- 0.1%
   2,625,000                  Methanex Corp., 4.25%, 12/1/24                         $       2,602,535
      40,000                  NOVA Chemicals Corp., 5.0%, 5/1/25 (144A)                         40,150
                                                                                     -----------------
                                                                                     $       2,642,685
------------------------------------------------------------------------------------------------------


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

36 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                               
                              Diversified Chemicals -- 0.2%
   4,845,000                  CF Industries, Inc., 5.15%, 3/15/34                    $       4,785,431
     980,000                  Eastman Chemical Co., 4.8%, 9/1/42                               939,978
   1,130,000                  WR Grace & Co-Conn, 5.125%, 10/1/21 (144A)                     1,138,475
                                                                                     -----------------
                                                                                     $       6,863,884
------------------------------------------------------------------------------------------------------
                              Fertilizers & Agricultural Chemicals -- 0.4%
   2,800,000                  Agrium, Inc., 4.125%, 3/15/35                          $       2,503,690
   7,600,000                  Agrium, Inc., 5.25%, 1/15/45                                   7,675,331
   2,675,000                  Monsanto Co., 3.375%, 7/15/24                                  2,554,949
                                                                                     -----------------
                                                                                     $      12,733,970
------------------------------------------------------------------------------------------------------
                              Specialty Chemicals -- 0.1%
   3,025,000                  The Valspar Corp., 3.3%, 2/1/25                        $       2,911,260
------------------------------------------------------------------------------------------------------
                              Construction Materials -- 0.4%
   3,328,000                  CEMEX Espana SA, 9.875%, 4/30/19 (144A)                $       3,641,498
  10,600,000                  CRH America, Inc., 3.875%, 5/18/25 (144A)                     10,503,996
     475,000                  Holcim US Finance S.a.r.l. & Cie SCS, 6.0%,
                              12/30/19 (144A)                                                  536,485
                                                                                     -----------------
                                                                                     $      14,681,979
------------------------------------------------------------------------------------------------------
                              Metal & Glass Containers -- 0.2%
   2,275,000                  Ball Corp., 4.0%, 11/15/23                             $       2,110,062
   4,000,000                  Ball Corp., 5.25%, 7/1/25                                      3,955,000
                                                                                     -----------------
                                                                                     $       6,065,062
------------------------------------------------------------------------------------------------------
                              Diversified Metals & Mining -- 0.2%
   1,850,000                  Freeport-McMoRan, Inc., 3.875%, 3/15/23                $       1,680,590
   1,650,000                  Freeport-McMoRan, Inc., 4.55%, 11/14/24                        1,537,424
   4,000,000                  Gold Fields Orogen Holdings BVI, Ltd., 4.875%,
                              10/7/20 (144A)                                                 3,660,000
                                                                                     -----------------
                                                                                     $       6,878,014
------------------------------------------------------------------------------------------------------
                              Steel -- 0.3%
   3,550,000                  Commercial Metals Co., 4.875%, 5/15/23                 $       3,337,000
   1,175,000                  Glencore Funding LLC, 4.125%, 5/30/23 (144A)                   1,136,713
   1,385,000                  Steel Dynamics, Inc., 5.125%, 10/1/21                          1,387,770
   3,135,000                  Worthington Industries, Inc., 4.55%, 4/15/26                   3,217,780
                                                                                     -----------------
                                                                                     $       9,079,263
------------------------------------------------------------------------------------------------------
                              Paper Products -- 0.5%
   1,285,000                  Clearwater Paper Corp., 4.5%, 2/1/23                   $       1,217,538
   6,975,000                  International Paper Co., 3.65%, 6/15/24                        6,874,616
   1,025,000                  International Paper Co., 3.8%, 1/15/26                         1,004,283
   2,400,000                  International Paper Co., 6.0%, 11/15/41                        2,587,505


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 37


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Paper Products -- (continued)
   3,930,000                  Resolute Forest Products, Inc., 5.875%, 5/15/23        $       3,576,300
                                                                                     -----------------
                                                                                     $      15,260,242
                                                                                     -----------------
                              Total Materials                                        $      77,116,359
------------------------------------------------------------------------------------------------------
                              CAPITAL GOODS -- 1.9%
                              Aerospace & Defense -- 0.4%
   2,600,000                  DigitalGlobe, Inc., 5.25%, 2/1/21 (144A)               $       2,544,750
  10,250,000                  United Technologies Corp., 1.778%, 5/4/18 (Step)              10,281,519
                                                                                     -----------------
                                                                                     $      12,826,269
------------------------------------------------------------------------------------------------------
                              Building Products -- 0.7%
   7,225,000                  Fortune Brands Home & Security, Inc.,
                              3.0%, 6/15/20                                          $       7,232,601
   1,050,000                  Masco Corp., 4.45%, 4/1/25                                     1,052,625
     825,000                  Masco Corp., 5.95%, 3/15/22                                      926,062
   4,260,000                  Masco Corp., 7.125%, 3/15/20                                   4,941,600
   5,150,000                  Owens Corning, 4.2%, 12/1/24                                   5,055,075
   3,600,000          5.75    Stanley Black & Decker, Inc., Floating Rate
                              Note, 12/15/53                                                 3,879,000
                                                                                     -----------------
                                                                                     $      23,086,963
------------------------------------------------------------------------------------------------------
                              Industrial Conglomerates -- 0.3%
   5,000,000                  Siemens Financieringsmaatschappij NV, 4.4%,
                              5/27/45 (144A)                                         $       4,939,615
   2,950,000                  Tyco Electronics Group SA, 6.55%, 10/1/17                      3,273,267
                                                                                     -----------------
                                                                                     $       8,212,882
------------------------------------------------------------------------------------------------------
                              Construction & Farm Machinery &
                              Heavy Trucks -- 0.1%
   3,727,000                  Cummins, Inc., 5.65%, 3/1/98                           $       3,917,983
     910,000                  Cummins, Inc., 6.75%, 2/15/27                                  1,118,453
                                                                                     -----------------
                                                                                     $       5,036,436
------------------------------------------------------------------------------------------------------
                              Industrial Machinery -- 0.0%+
     604,000                  Valmont Industries, Inc., 6.625%, 4/20/20              $         697,006
------------------------------------------------------------------------------------------------------
                              Trading Companies & Distributors -- 0.4%
   2,800,000                  Aircastle, Ltd., 6.75%, 4/15/17                        $       2,982,000
   2,260,000                  GATX Corp., 5.2%, 3/15/44                                      2,285,495
   5,660,000                  GATX Corp., 6.0%, 2/15/18                                      6,185,429
                                                                                     -----------------
                                                                                     $      11,452,924
                                                                                     -----------------
                              Total Capital Goods                                    $      61,312,480
------------------------------------------------------------------------------------------------------
                              COMMERCIAL SERVICES & SUPPLIES -- 0.2%
                              Environmental & Facilities Services -- 0.0%+
   1,700,000                  Waste Management, Inc., 3.125%, 3/1/25                 $       1,649,267
------------------------------------------------------------------------------------------------------


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

38 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                               
                              Research & Consulting Services -- 0.2%
   5,275,000                  Verisk Analytics, Inc., 5.5%, 6/15/45                  $       5,187,952
                                                                                     -----------------
                              Total Commercial Services & Supplies                   $       6,837,219
------------------------------------------------------------------------------------------------------
                              TRANSPORTATION -- 1.4%
                              Airlines -- 0.4%
   4,642,292                  Air Canada 2013-1 Class A Pass Through Trust,
                              4.125%, 11/15/26 (144A)                                $       4,746,744
   4,025,000                  Air Canada 2015-1 Class A Pass Through Trust,
                              3.6%, 9/15/28 (144A)                                           3,954,562
   2,350,000                  Southwest Airlines Co., 2.75%, 11/6/19                         2,384,312
   1,405,580                  US Airways 2013-1 Class A Pass Through Trust,
                              3.95%, 5/15/27                                                 1,412,607
                                                                                     -----------------
                                                                                     $      12,498,225
------------------------------------------------------------------------------------------------------
                              Railroads -- 0.6%
  13,825,000                  Burlington Northern Santa Fe LLC, 4.15%, 4/1/45        $      12,750,867
   6,650,000                  TTX Co., 3.6%, 1/15/25 (144A)                                  6,675,809
                                                                                     -----------------
                                                                                     $      19,426,676
------------------------------------------------------------------------------------------------------
                              Trucking -- 0.3%
     529,000                  Asciano Finance, Ltd., 4.625%, 9/23/20 (144A)          $         561,084
   8,850,000                  Penske Truck Leasing Co., Lp, 3.375%,
                              2/1/22 (144A)                                                  8,578,686
                                                                                     -----------------
                                                                                     $       9,139,770
------------------------------------------------------------------------------------------------------
                              Highways & Railtracks -- 0.1%
   4,600,000                  ERAC USA Finance LLC, 4.5%, 2/15/45 (144A)             $       4,227,501
                                                                                     -----------------
                              Total Transportation                                   $      45,292,172
------------------------------------------------------------------------------------------------------
                              AUTOMOBILES & COMPONENTS -- 0.7%
                              Auto Parts & Equipment -- 0.2%
   5,400,000                  Delphi Corp., 4.15%, 3/15/24                           $       5,582,104
------------------------------------------------------------------------------------------------------
                              Automobile Manufacturers -- 0.5%
   4,975,000                  Ford Motor Credit Co., LLC, 2.24%, 6/15/18             $       4,978,363
   6,425,000                  Ford Motor Credit Co., LLC, 3.219%, 1/9/22                     6,352,950
   5,000,000                  Toyota Motor Credit Corp., 2.125%, 7/18/19                     5,016,045
                                                                                     -----------------
                                                                                     $      16,347,358
                                                                                     -----------------
                              Total Automobiles & Components                         $      21,929,462
------------------------------------------------------------------------------------------------------
                              CONSUMER DURABLES & APPAREL -- 0.0%+
                              Home Furnishings -- 0.0%+
     800,000                  Mohawk Industries, Inc., 3.85%, 2/1/23                 $         798,865
                                                                                     -----------------
                              Total Consumer Durables & Apparel                      $         798,865
------------------------------------------------------------------------------------------------------


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 39


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                               
                              CONSUMER SERVICES -- 0.4%
                              Casinos & Gaming -- 0.2%
   1,010,000                  GLP Capital LP, 4.375%, 11/1/18                        $       1,036,512
   3,550,000                  MGM Resorts International, 6.0%, 3/15/23                       3,594,375
                                                                                     -----------------
                                                                                     $       4,630,887
------------------------------------------------------------------------------------------------------
                              Education Services -- 0.2%
   1,000,000                  Bowdoin College, 4.693%, 7/1/12                        $         836,403
   2,600,000                  President and Fellows of Harvard College,
                              2.3%, 10/1/23                                                  2,443,163
   3,550,000                  Tufts University, 5.017%, 4/15/12                              3,564,530
                                                                                     -----------------
                                                                                     $       6,844,096
------------------------------------------------------------------------------------------------------
                              Specialized Consumer Services -- 0.0%+
   1,300,000                  Sotheby's, 5.25%, 10/1/22 (144A)                       $       1,274,000
                                                                                     -----------------
                              Total Consumer Services                                $      12,748,983
------------------------------------------------------------------------------------------------------
                              MEDIA -- 1.0%
                              Broadcasting -- 0.5%
   6,125,000                  CBS Corp., 3.7%, 8/15/24                               $       5,985,025
   2,250,000                  CBS Corp., 4.6%, 1/15/45                                       2,009,030
   6,200,000                  DIRECTV Holdings LLC, 3.8%, 3/15/22                            6,235,662
   1,850,000                  Discovery Communications LLC, 3.45%, 3/15/25                   1,735,936
                                                                                     -----------------
                                                                                     $      15,965,653
------------------------------------------------------------------------------------------------------
                              Cable & Satellite -- 0.2%
   4,900,000                  DIRECTV Holdings LLC, 3.95%, 1/15/25                   $       4,804,029
   1,900,000                  Intelsat Jackson Holdings SA, 7.25%, 4/1/19                    1,928,500
                                                                                     -----------------
                                                                                     $       6,732,529
------------------------------------------------------------------------------------------------------
                              Movies & Entertainment -- 0.3%
   8,300,000                  Time Warner, Inc., 4.7%, 1/15/21                       $       8,969,071
                                                                                     -----------------
                              Total Media                                            $      31,667,253
------------------------------------------------------------------------------------------------------
                              RETAILING -- 1.0%
                              Catalog Retail -- 0.2%
   7,300,000                  QVC, Inc., 4.45%, 2/15/25                              $       7,044,091
------------------------------------------------------------------------------------------------------
                              Internet Retail -- 0.5%
   5,900,000                  Expedia, Inc., 4.5%, 8/15/24                           $       5,950,893
     800,000                  Expedia, Inc., 5.95%, 8/15/20                                    891,693
   7,375,000                  The Priceline Group, Inc., 3.65%, 3/15/25                      7,179,703
                                                                                     -----------------
                                                                                     $      14,022,289
------------------------------------------------------------------------------------------------------
                              Home Improvement Retail -- 0.1%
   4,520,000                  The Home Depot, Inc., 2.625%, 6/1/22                   $       4,445,479
------------------------------------------------------------------------------------------------------


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

40 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                               
                              Automotive Retail -- 0.1%
   2,575,000                  AutoZone, Inc., 2.5%, 4/15/21                          $       2,522,995
------------------------------------------------------------------------------------------------------
                              Homefurnishing Retail -- 0.1%
   2,000,000                  Bed Bath & Beyond, Inc., 3.749%, 8/1/24                $       1,995,012
                                                                                     -----------------
                              Total Retailing                                        $      30,029,866
------------------------------------------------------------------------------------------------------
                              FOOD & STAPLES RETAILING -- 0.3%
                              Drug Retail -- 0.1%
     650,000                  CVS Health Corp., 2.25%, 8/12/19                       $         647,048
     648,221                  CVS Pass-Through Trust, 5.298%, 1/11/27 (144A)                   716,284
   1,378,393                  CVS Pass-Through Trust, 5.773%, 1/10/33 (144A)                 1,549,323
                                                                                     -----------------
                                                                                     $       2,912,655
------------------------------------------------------------------------------------------------------
                              Food Retail -- 0.2%
   7,472,000                  The Kroger Co., 2.95%, 11/1/21                         $       7,424,209
                                                                                     -----------------
                              Total Food & Staples Retailing                         $      10,336,864
------------------------------------------------------------------------------------------------------
                              FOOD, BEVERAGE & TOBACCO -- 0.5%
                              Distillers & Vintners -- 0.0%+
     630,000                  Constellation Brands, Inc., 3.75%, 5/1/21              $         617,400
------------------------------------------------------------------------------------------------------
                              Agricultural Products -- 0.2%
   5,175,000                  Viterra, Inc., 5.95%, 8/1/20 (144A)                    $       5,689,343
------------------------------------------------------------------------------------------------------
                              Packaged Foods & Meats -- 0.3%
   4,200,000                  Grupo Bimbo SAB de CV, 3.875%, 6/27/24 (144A)          $       4,186,014
   3,240,000                  Kraft Foods Group, Inc., 3.5%, 6/6/22                          3,247,944
                                                                                     -----------------
                                                                                     $       7,433,958
------------------------------------------------------------------------------------------------------
                              Tobacco -- 0.0%+
   1,050,000                  RJ Reynolds Tobacco Co., 3.75%, 5/20/23                $       1,020,524
                                                                                     -----------------
                              Total Food, Beverage & Tobacco                         $      14,761,225
------------------------------------------------------------------------------------------------------
                              HEALTH CARE EQUIPMENT & SERVICES -- 0.7%
                              Health Care Equipment -- 0.5%
  10,525,000                  Becton Dickinson and Co., 3.734%, 12/15/24             $      10,489,594
   7,300,000                  Medtronic, Inc., 4.625%, 3/15/45 (144A)                        7,390,148
                                                                                     -----------------
                                                                                     $      17,879,742
------------------------------------------------------------------------------------------------------
                              Health Care Services -- 0.1%
   2,600,000                  Catholic Health Initiatives, 4.35%, 11/1/42            $       2,377,632
------------------------------------------------------------------------------------------------------
                              Health Care Facilities -- 0.1%
   2,400,000                  NYU Hospitals Center, 4.428%, 7/1/42                   $       2,278,392
                                                                                     -----------------
                              Total Health Care Equipment & Services                 $      22,535,766
------------------------------------------------------------------------------------------------------


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 41


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              PHARMACEUTICALS, BIOTECHNOLOGY &
                              LIFE SCIENCES -- 0.8%
                              Biotechnology -- 0.6%
  11,025,000                  Baxalta, Inc., 3.6%, 6/23/22 (144A)                    $      11,018,187
   7,550,000                  Gilead Sciences, Inc., 4.5%, 2/1/45                            7,520,902
                                                                                     -----------------
                                                                                     $      18,539,089
------------------------------------------------------------------------------------------------------
                              Pharmaceuticals -- 0.1%
     520,000                  Endo, Ltd., 6.0%, 2/1/25 (144A)                        $         528,450
   3,150,000                  Johnson & Johnson, 4.375%, 12/5/33                             3,337,979
                                                                                     -----------------
                                                                                     $       3,866,429
------------------------------------------------------------------------------------------------------
                              Life Sciences Tools & Services -- 0.1%
     894,000                  Agilent Technologies, Inc., 6.5%, 11/1/17              $         987,073
                                                                                     -----------------
                              Total Pharmaceuticals, Biotechnology &
                              Life Sciences                                          $      23,392,591
------------------------------------------------------------------------------------------------------
                              BANKS -- 5.0%
                              Diversified Banks -- 4.0%
   5,215,000                  Australia & New Zealand Banking Group, Ltd.,
                              4.5%, 3/19/24 (144A)                                   $       5,244,011
   1,150,000                  Bank of America Corp., 4.2%, 8/26/24                           1,147,231
   1,100,000                  Bank of America Corp., 7.75%, 8/15/15                          1,108,098
   3,950,000          6.10    Bank of America Corp., Floating Rate Note
                              (Perpetual)                                                    3,900,625
   6,975,000          6.50    Bank of America Corp., Floating Rate Note,
                              10/23/49                                                       7,219,125
   2,200,000          6.25    Bank of America Corp., Floating Rate Note,
                              9/29/49                                                        2,190,386
   3,515,000                  Barclays Bank Plc, 6.05%, 12/4/17 (144A)                       3,824,457
   5,250,000                  Barclays Plc, 3.65%, 3/16/25                                   4,965,440
   2,400,000                  BBVA Bancomer SA Texas, 4.375%,
                              4/10/24 (144A)                                                 2,428,800
   3,815,000                  BBVA Bancomer SA Texas, 6.5%, 3/10/21 (144A)                   4,129,738
   2,850,000          5.90    Citigroup, Inc., Floating Rate Note (Perpetual)                2,807,250
   2,925,000          5.88    Citigroup, Inc., Floating Rate Note (Perpetual)                2,931,435
   2,295,000          5.95    Citigroup, Inc., Floating Rate Note (Perpetual)                2,260,575
   3,435,000                  Cooperatieve Centrale Raiffeisen-Boerenleenbank
                              BA Netherlands, 3.875%, 2/8/22                                 3,573,455
   6,425,000                  Cooperatieve Centrale Raiffeisen-Boerenleenbank
                              BA Netherlands, 3.95%, 11/9/22                                 6,424,139
   5,075,000          6.62    Credit Agricole SA, Floating Rate Note
                              (Perpetual) (144A)                                             4,953,200
   7,475,000                  Export-Import Bank of Korea, 2.25%, 1/21/20                    7,402,649
   5,425,000                  First Tennessee Bank NA, 2.95%, 12/1/19                        5,422,304
   1,305,000                  HSBC Bank Plc, 7.65%, 5/1/25                                   1,661,518
   3,940,000                  HSBC Holdings Plc, 4.25%, 3/14/24                              3,979,341


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

42 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Diversified Banks -- (continued)
   3,476,000                  Intesa Sanpaolo S.p.A., 3.625%, 8/12/15 (144A)         $       3,484,614
   1,400,000                  Intesa Sanpaolo S.p.A., 6.5%, 2/24/21 (144A)                   1,597,105
   5,125,000                  Macquarie Bank, Ltd., 4.875%, 6/10/25 (144A)                   5,043,102
     840,000                  Macquarie Bank, Ltd., 6.625%, 4/7/21 (144A)                      962,151
   4,500,000                  Nordea Bank AB, 4.25%, 9/21/22 (144A)                          4,608,878
   5,600,000          6.12    Nordea Bank AB, Floating Rate Note (Perpetual)
                              (144A)                                                         5,521,247
     736,842          3.04    SBP DPR Finance Co., Floating Rate Note,
                              3/15/17 (144A)                                                   736,564
   2,600,000          4.50    Scotiabank Peru SAA, Floating Rate Note,
                              12/13/27 (144A)                                                2,554,500
   2,200,000                  Standard Chartered Bank, 6.4%, 9/26/17 (144A)                  2,397,481
   4,800,000                  Standard Chartered Plc, 3.95%, 1/11/23 (144A)                  4,684,253
   1,800,000                  Sumitomo Mitsui Banking Corp., 1.75%, 1/16/18                  1,806,395
  11,675,000                  The Bank of Tokyo-Mitsubishi UFJ, Ltd., 2.3%,
                              3/5/20 (144A)                                                 11,625,253
   3,400,000          5.88    Wells Fargo & Co., Floating Rate Note (Perpetual)              3,480,920
                                                                                     -----------------
                                                                                     $     126,076,240
------------------------------------------------------------------------------------------------------
                              Regional Banks -- 0.9%
   1,190,000                  CoBank ACB, 7.875%, 4/16/18 (144A)                     $       1,373,302
   7,000,000                  Credit Suisse New York NY, 1.75%, 1/29/18                      6,972,784
   3,350,000                  HSBC Bank USA NA New York NY, 6.0%, 8/9/17                     3,642,944
   7,378,000                  KeyCorp, 5.1%, 3/24/21                                         8,185,721
   1,435,000                  PNC Bank NA, 6.0%, 12/7/17                                     1,576,491
   1,025,000                  SunTrust Banks, Inc., 3.5%, 1/20/17                            1,055,540
     890,000          6.75    The PNC Financial Services Group, Inc., Floating
                              Rate Note (Perpetual)                                            985,675
   3,540,000                  Wells Fargo Bank NA, 6.0%, 11/15/17                            3,899,455
                                                                                     -----------------
                                                                                     $      27,691,912
------------------------------------------------------------------------------------------------------
                              Thrifts & Mortgage Finance -- 0.1%
   2,300,000                  Astoria Financial Corp., 5.0%, 6/19/17                 $       2,414,487
                                                                                     -----------------
                              Total Banks                                            $     156,182,639
------------------------------------------------------------------------------------------------------
                              DIVERSIFIED FINANCIALS -- 4.5%
                              Other Diversified Financial Services -- 0.8%
   3,000,000                  Alterra Finance LLC, 6.25%, 9/30/20                    $       3,445,251
   5,930,000                  Carlyle Holdings II Finance LLC, 5.625%,
                              3/30/43 (144A)                                                 6,160,790
   4,860,000                  General Electric Capital Corp., 5.3%, 2/11/21                  5,464,740
   1,384,187                  Grain Spectrum Funding II LLC, 3.29%,
                              10/10/19 (144A)                                                1,370,345
   1,890,000          6.12    JPMorgan Chase & Co., Floating Rate Note, 12/29/49             1,897,749
   6,215,000          6.75    JPMorgan Chase & Co., Floating Rate Note, 8/29/49              6,640,292


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 43


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Other Diversified Financial Services -- (continued)
   1,250,000          0.00    Tiers Trust, Floating Rate Note, 10/15/97 (144A) (e)   $       1,099,140
                                                                                     -----------------
                                                                                     $      26,078,307
------------------------------------------------------------------------------------------------------
                              Specialized Finance -- 0.6%
   3,725,000                  Aviation Capital Group Corp., 6.75%,
                              4/6/21 (144A)                                          $       4,254,565
   3,200,000                  BM&FBovespa SA -- Bolsa de Valores
                              Mercadorias e Futuros, 5.5%, 7/16/20 (144A)                    3,392,000
   2,980,000                  Cantor Fitzgerald LP, 7.875%, 10/15/19 (144A)                  3,278,510
   1,475,000                  LeasePlan Corp., NV, 2.5%, 5/16/18 (144A)                      1,477,168
   2,000,000                  National Rural Utilities Cooperative Finance Corp.,
                              5.45%, 2/1/18                                                  2,191,678
   5,480,000                  Nationstar Mortgage LLC, 6.5%, 6/1/22                          5,007,350
                                                                                     -----------------
                                                                                     $      19,601,271
------------------------------------------------------------------------------------------------------
                              Consumer Finance -- 1.1%
   1,500,000                  Ally Financial, Inc., 3.6%, 5/21/18                    $       1,501,875
     800,000                  Ally Financial, Inc., 4.625%, 3/30/25                            762,000
   5,050,000                  Ally Financial, Inc., 5.125%, 9/30/24                          5,062,625
   5,985,000                  American Honda Finance Corp., 1.2%, 7/14/17                    5,989,806
   1,465,000                  Capital One Bank USA NA, 8.8%, 7/15/19                         1,797,149
   6,650,000                  Capital One Financial Corp., 3.75%, 4/24/24                    6,619,403
   6,525,000                  General Motors Financial Co, Inc., 4.0%, 1/15/25               6,402,526
   2,245,000                  Hyundai Capital America, 1.45%, 2/6/17 (144A)                  2,237,838
   3,125,000                  Hyundai Capital America, 2.0%, 3/19/18 (144A)                  3,126,116
                                                                                     -----------------
                                                                                     $      33,499,338
------------------------------------------------------------------------------------------------------
                              Asset Management & Custody Banks -- 1.0%
   2,525,000                  Affiliated Managers Group, Inc., 4.25%, 2/15/24        $       2,601,785
   1,725,000                  Blackstone Holdings Finance Co., LLC, 5.0%,
                              6/15/44 (144A)                                                 1,729,307
   4,950,000                  Blackstone Holdings Finance Co., LLC, 4.75%,
                              2/15/23 (144A)                                                 5,301,420
   1,975,000                  Blackstone Holdings Finance Co., LLC, 6.25%,
                              8/15/42 (144A)                                                 2,305,400
     733,000                  Eaton Vance Corp., 6.5%, 10/2/17                                 807,995
   5,025,000                  KKR Group Finance Co., II LLC, 5.5%,
                              2/1/43 (144A)                                                  5,086,230
   2,400,000                  Legg Mason, Inc., 3.95%, 7/15/24                               2,427,050
   4,290,000                  Legg Mason, Inc., 5.625%, 1/15/44                              4,577,177
   4,250,000                  Neuberger Berman Group LLC, 4.875%,
                              4/15/45 (144A)                                                 3,853,552
   1,250,000          4.50    The Bank of New York Mellon Corp., Floating
                              Rate Note (Perpetual)                                          1,156,250
                                                                                     -----------------
                                                                                     $      29,846,166
------------------------------------------------------------------------------------------------------


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

44 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Investment Banking & Brokerage -- 1.0%
   1,650,000                  KKR Group Finance Co., III LLC, 5.125%,
                              6/1/44 (144A)                                          $       1,581,942
   2,730,000                  Macquarie Group, Ltd., 6.0%, 1/14/20 (144A)                    3,067,575
   5,100,000                  Morgan Stanley, 4.1%, 5/22/23                                  5,109,532
     300,000                  Morgan Stanley, 4.875%, 11/1/22                                  319,112
   2,900,000          5.55    Morgan Stanley, Floating Rate Note (Perpetual)                 2,878,975
     643,000                  North American Development Bank, 2.3%,
                              10/10/18                                                         654,388
   6,025,000                  TD Ameritrade Holding Corp., 3.625%, 4/1/25                    6,118,671
   6,875,000                  The Goldman Sachs Group, Inc., 6.75%, 10/1/37                  8,064,018
   4,400,000                  UBS AG, 7.625%, 8/17/22                                        5,156,796
                                                                                     -----------------
                                                                                     $      32,951,009
                                                                                     -----------------
                              Total Diversified Financials                           $     141,976,091
------------------------------------------------------------------------------------------------------
                              INSURANCE -- 5.0%
                              Insurance Brokers -- 0.1%
   5,000,000                  Brown & Brown, Inc., 4.2%, 9/15/24                     $       4,935,405
------------------------------------------------------------------------------------------------------
                              Life & Health Insurance -- 0.7%
   7,000,000                  Aflac, Inc., 3.625%, 11/15/24                          $       7,023,821
   4,250,000                  Protective Life Corp., 7.375%, 10/15/19                        5,032,659
   1,090,000                  Prudential Financial, Inc., 4.5%, 11/16/21                     1,187,130
   1,500,000          5.62    Prudential Financial, Inc., Floating Rate Note,
                              6/15/43                                                        1,554,750
   2,140,000          8.88    Prudential Financial, Inc., Floating Rate Note,
                              6/15/68                                                        2,503,800
   1,800,000          5.88    Prudential Financial, Inc., Floating Rate Note,
                              9/15/42                                                        1,902,240
   3,205,000                  Teachers Insurance & Annuity Association of
                              America, 6.85%, 12/16/39 (144A)                                4,013,150
                                                                                     -----------------
                                                                                     $      23,217,550
------------------------------------------------------------------------------------------------------
                              Multi-line Insurance -- 0.7%
   5,985,000                  AIG, 3.875%, 1/15/35                                   $       5,405,850
   3,900,000                  Assurant, Inc., 4.0%, 3/15/23                                  3,902,005
   2,335,000                  AXA SA, 8.6%, 12/15/30                                         3,129,262
   5,325,000                  Liberty Mutual Insurance Co., 7.697%
                              (Perpetual) (144A)                                             6,504,578
   2,650,000                  Loews Corp., 5.25%, 3/15/16                                    2,731,904
                                                                                     -----------------
                                                                                     $      21,673,599
------------------------------------------------------------------------------------------------------
                              Property & Casualty Insurance -- 0.3%
   1,850,000                  Delphi Financial Group, Inc., 7.875%, 1/31/20          $       2,192,422
   1,000,000                  OneBeacon US Holdings, Inc., 4.6%, 11/9/22                     1,019,542
   5,455,000          6.50    The Allstate Corp., Floating Rate Note, 5/15/57                6,109,600
                                                                                     -----------------
                                                                                     $       9,321,564
------------------------------------------------------------------------------------------------------


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 45


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Reinsurance -- 3.2%
   1,000,000          5.91    Alamo Re, Ltd., Floating Rate Note, 6/7/18
                              (Cat Bond) (144A)                                      $         993,800
     937,930                  Altair Re, Variable Rate Notes, 6/30/16 (g)                      546,438
   1,400,000                  Altair Re, Variable Rate Notes, 6/30/17 (g)                    1,442,000
   1,800,000          6.38    Aquarius + Investments Plc for Swiss Reinsurance
                              Co., Ltd., Floating Rate Note, 9/1/24                          1,861,214
     700,000                  Arlington Segregated Account (Kane SAC Ltd.),
                              Variable Rate Notes, 8/1/15 (g)                                  797,510
     900,000                  Arlington Segregated Account (Kane SAC Ltd.),
                              Variable Rate Notes, 8/31/16 (g)                                 906,390
     500,000          3.46    Atlas IX Capital, Ltd., Floating Rate Note, 1/17/19
                              (Cat Bond) (144A)                                                508,550
     250,000          8.14    Atlas Reinsurance VII, Ltd., Floating Rate Note,
                              1/7/16 (Cat Bond) (144A)                                         250,075
     800,000                  Bersick Segregated Account (Kane SAC Ltd.),
                              Variable Rate Note, 1/22/16 (g)                                  817,760
   3,050,000          4.37    Blue Danube II, Ltd., Floating Rate Note, 5/23/16
                              (Cat Bond) (144A)                                              3,032,615
   1,250,000          5.27    Caelus Re, Ltd., Floating Rate Note, 3/7/16
                              (Cat Bond) (144A)                                              1,226,000
   1,850,000          6.86    Caelus Re, Ltd., Floating Rate Note, 4/7/17
                              (Cat Bond) (144A)                                              1,855,550
   3,000,000                  Carnoustie Segregated Account (Kane SAC Ltd.),
                              Variable Rate Notes, 2/19/16 (g)                               3,189,900
     250,000          4.26    Citrus Re, Ltd., Floating Rate Note, 4/18/17 (Cat
                              Bond) (144A)                                                     242,875
     550,000          3.76    Citrus Re, Ltd., Floating Rate Note, 4/24/17 (Cat
                              Bond) (144A)                                                     535,425
   1,200,000                  Clarendon Segregated Account (Kane SAC Ltd.),
                              Variable Rate Notes, 6/15/16 (g)                               1,151,760
   1,100,000          0.00    Compass Re II, Ltd., Floating Rate Note, 12/8/15
                              (Cat Bond)                                                     1,047,640
     250,000          9.00    East Lane Re V, Ltd., Floating Rate Note, 3/16/16
                              (Cat Bond) (144A)                                                252,150
     700,000          3.76    East Lane Re VI, Ltd., Floating Rate Note, 3/13/20
                              (Cat Bond) (144A)                                                687,540
   2,500,000                  Eden Re II, Ltd., 4/19/18 (144A) (d) (g)                       2,560,000
   2,650,000          5.01    Embarcadero Reinsurance, Ltd., Floating Rate
                              Note, 2/7/17 (Cat Bond) (144A)                                 2,649,735
   3,654,000                  Exeter Segregated Account (Kane SAC Ltd.),
                              Variable Rate Notes, 1/7/16 (g)                                3,686,521
   1,000,000                  Fairfield Segregated Account (Kane SAC Ltd.),
                              Variable Rate Notes, 2/2/16 (g)                                  956,500
   1,200,000          7.43    Galileo Re, Ltd., Floating Rate Note, 1/9/19 (Cat
                              Bond) (144A)                                                   1,207,920
   1,600,000                  Gloucester Segregated Account (Kane SAC Ltd.),
                              Variable Rate Notes, 6/12/15 (g)                               1,600,000


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

46 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Reinsurance -- (continued)
   2,800,000          2.22    Golden State Re II, Ltd., Floating Rate Note,
                              1/8/19 (Cat Bond) (144A)                               $       2,778,160
   3,700,000                  Gullane Segregated Account (Kane SAC Ltd.),
                              Variable Rate Notes, 1/22/17 (g)                               3,887,960
   1,009,200                  Hereford Segregated Account (Kane SAC Ltd.),
                              Variable Rate Notes, 1/7/16 (g)                                1,021,411
   1,150,000          4.00    Ibis Re II, Ltd., Floating Rate Note, 6/28/16 (Cat
                              Bond) (144A)                                                   1,145,400
   1,000,000          4.51    Ibis Re II, Ltd., Floating Rate Note, 6/28/16 (Cat
                              Bond) (144A)                                                     990,900
   1,700,000          3.77    Kilimanjaro Re, Ltd., Floating Rate Note, 11/25/19
                              (Cat Bond) (144A)                                              1,677,730
     350,000          4.52    Kilimanjaro Re, Ltd., Floating Rate Note, 4/30/18
                              (Cat Bond) (144A)                                                335,440
   3,700,000          4.77    Kilimanjaro Re, Ltd., Floating Rate Note, 4/30/18
                              (Cat Bond) (144A)                                              3,562,360
     500,000                  Lahinch Re, Variable Rate Notes, 6/15/16 (g)                     487,450
     250,000          8.28    Loma Reinsurance, Ltd., Bermuda, Floating Rate
                              Note, 1/8/18 (Cat Bond) (144A)                                   256,375
   1,800,000          3.97    Longpoint Re, Ltd. III, Floating Rate Note, 5/18/16
                              (Cat Bond) (144A)                                              1,793,160
   1,300,000                  Lorenzo Re, Ltd., Variable Rate Notes, 3/31/18 (g)             1,324,440
   1,000,000          2.02    Merna Re V, Ltd., Floating Rate Note, 4/7/17 (Cat
                              Bond) (144A)                                                     995,300
     750,000          0.00    Merna Reinsurance, Ltd., Floating Rate Note,
                              4/9/18 (Cat Bond) (144A) (d)                                     747,450
   1,956,533                  Muirfield Segregated Account (Kane SAC Ltd.),
                              Variable Rate Notes, 1/12/16 (g)                               1,972,186
   1,000,000          8.60    Mythen Re, Ltd., Series 2012-2 Class A, Floating
                              Rate Note, 1/5/17 (Cat Bond) (144A)                            1,004,400
   2,100,000          8.03    Mythen Re, Ltd., Series 2013-1 Class B, Floating
                              Rate Note, 7/9/15 (Cat Bond) (144A)                            2,100,210
   1,100,000          7.27    Northshore Re, Ltd., Floating Rate Note, 7/5/16
                              (Cat Bond) (144A)                                              1,114,300
   3,600,000                  Pangaea Re, Series 2015-1, Principal at Risk
                              Notes, 2/1/19 (g)                                              3,809,160
   4,000,000                  Pangaea Re, Series 2015-2, Principal at Risk
                              Notes, 11/30/19 (g)                                            4,019,600
   1,000,000                  Prestwick Segregated Account (Kane SAC Ltd.),
                              Variable Rate Notes, 7/1/16 (g)                                1,022,200
   1,650,000          8.61    Queen Street VII Re, Ltd., Floating Rate Note,
                              4/8/16 (Cat Bond) (144A)                                       1,659,900
   1,000,000          8.91    Residential Reinsurance 2011, Ltd., Floating
                              Rate Note, 6/6/17 (Cat Bond) (144A)                              984,700
   2,800,000          4.51    Residential Reinsurance 2012, Ltd., Floating
                              Rate Note, 12/6/16 (Cat Bond) (144A)                           2,827,440
   1,650,000          5.76    Residential Reinsurance 2012, Ltd., Floating
                              Rate Note, 12/6/16 (Cat Bond) (144A)                           1,677,720


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 47


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Reinsurance -- (continued)
     800,000          8.01    Residential Reinsurance 2012, Ltd., Floating Rate
                              Note, 6/6/16 (Cat Bond) (144A)                         $         834,480
     275,000         10.01    Residential Reinsurance 2012, Ltd., Floating Rate
                              Note, 6/6/16 (Cat Bond) (144A)                                   283,965
     250,000          9.27    Residential Reinsurance 2013, Ltd., Floating Rate
                              Note, 6/6/17 (Cat Bond) (144A)                                   257,475
     800,000          3.02    Sanders Re, Ltd., Floating Rate Note, 5/25/18
                              (Cat Bond) (144A)                                                770,960
   1,250,000          4.02    Sanders Re, Ltd., Floating Rate Note, 5/5/17
                              (Cat Bond) (144A)                                              1,220,875
   1,200,000          3.54    Sanders Re, Ltd., Floating Rate Note, 5/5/17
                              (Cat Bond) (144A)                                              1,169,040
   2,000,000          3.91    Sanders Re, Ltd., Floating Rate Note, 6/7/17
                              (Cat Bond) (144A)                                              1,978,000
   3,000,000                  Sector Re V, Ltd., Variable Rate Notes,
                              3/1/20 (144A) (g)                                              3,016,800
     400,000                  Sector Re V, Ltd., Variable Rate Notes,
                              3/1/20 (144A) (g)                                                404,320
     250,000                  Silverton Re, Ltd., Variable Rate Notes,
                              9/16/16 (144A) (g)                                                 9,750
   1,000,000                  Silverton Re, Ltd., Variable Rate Notes,
                              9/18/17 (144A) (g)                                             1,110,400
   1,300,000                  St. Andrews Segregated Account (Kane SAC Ltd.),
                              Variable Rate Notes, 1/22/16 (g)                               1,326,520
     250,000         11.26    Successor X, Ltd., Floating Rate Note, 11/10/15
                              (Cat Bond) (144A)                                                247,950
     300,000          8.51    Tar Heel Re, Ltd., Floating Rate Note, 5/9/16
                              (Cat Bond) (144A)                                                305,190
   2,018,867                  Troon Segregated Account (Kane SAC Ltd.), Variable
                              Rate Notes, 1/12/16 (g)                                        2,030,374
   1,012,000                  Turnberry Segregated Account (Kane SAC Ltd.),
                              Variable Rate Notes, 1/15/16 (g)                               1,021,310
   2,500,000                  Versutus Ltd., Series 2015-A, Variable Rate Notes,
                              12/31/2017 (g)                                                 2,619,500
   1,500,000          2.76    Vita Capital V, Ltd., Floating Rate Note, 1/15/17
                              (Cat Bond) (144A)                                              1,519,350
     500,000          2.77    Vitality Re IV, Ltd., Floating Rate Note, 1/9/17
                              (Cat Bond) (144A)                                                506,350
     500,000          1.77    Vitality Re V, Ltd., Floating Rate Note, 1/7/19
                              (Cat Bond) (144A)                                                496,250
   1,400,000          5.88    Wilton Re Finance LLC, Floating Rate Note,
                              3/30/33 (144A)                                                 1,452,966
                                                                                     -----------------
                                                                                     $      99,783,045
                                                                                     -----------------
                              Total Insurance                                        $     158,931,163
------------------------------------------------------------------------------------------------------
                              REAL ESTATE -- 1.5%
                              Diversified REIT -- 0.8%
   4,225,000                  Brixmor Operating Partnership LP, 3.85%, 2/1/25        $       4,060,487


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

48 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                               
                              Diversified REIT -- (continued)
   1,475,000                  DCT Industrial Operating Partnership LP,
                              4.5%, 10/15/23                                         $       1,501,692
   2,175,000                  Duke Realty LP, 3.625%, 4/15/23                                2,150,003
   5,300,000                  Duke Realty LP, 3.75%, 12/1/24                                 5,266,032
   9,125,000                  Essex Portfolio LP, 3.5%, 4/1/25                               8,837,307
   1,715,000                  WP Carey, Inc., 4.6%, 4/1/24                                   1,721,970
                                                                                     -----------------
                                                                                     $      23,537,491
------------------------------------------------------------------------------------------------------
                              Office REIT -- 0.4%
      75,000                  Alexandria Real Estate Equities, Inc.,
                              2.75%, 1/15/20                                         $          74,237
   1,093,000                  Alexandria Real Estate Equities, Inc.,
                              3.9%, 6/15/23                                                  1,088,439
   2,670,000                  Alexandria Real Estate Equities, Inc., 4.6%, 4/1/22            2,812,671
   1,250,000                  DuPont Fabros Technology LP, 5.875%, 9/15/21                   1,265,625
   2,032,000                  Highwoods Realty LP, 3.2%, 6/15/21                             2,022,082
   2,100,000                  Highwoods Realty LP, 3.625%, 1/15/23                           2,071,870
   2,550,000                  Piedmont Operating Partnership LP, 3.4%, 6/1/23                2,408,763
                                                                                     -----------------
                                                                                     $      11,743,687
------------------------------------------------------------------------------------------------------
                              Health Care REIT -- 0.3%
   3,750,000                  Healthcare Realty Trust, Inc., 3.875%, 5/1/25          $       3,616,958
   3,945,000                  Omega Healthcare Investors, Inc., 4.95%, 4/1/24                4,035,045
   2,485,000                  Senior Housing Properties Trust, 6.75%, 4/15/20                2,790,610
                                                                                     -----------------
                                                                                     $      10,442,613
------------------------------------------------------------------------------------------------------
                              Specialized REIT -- 0.0%+
     730,000                  CubeSmart LP, 4.8%, 7/15/22                            $         785,162
                                                                                     -----------------
                              Total Real Estate                                      $      46,508,953
------------------------------------------------------------------------------------------------------
                              SOFTWARE & SERVICES -- 1.2%
                              Internet Software & Services -- 0.1%
   1,875,000                  Equinix, Inc., 5.75%, 1/1/25                           $       1,856,250
------------------------------------------------------------------------------------------------------
                              Data Processing & Outsourced Services -- 0.1%
   3,000,000                  Cardtronics, Inc., 5.125%, 8/1/22 (144A)               $       2,932,500
------------------------------------------------------------------------------------------------------
                              Application Software -- 0.7%
   8,100,000                  Adobe Systems, Inc., 3.25%, 2/1/25                     $       7,820,113
  10,450,000                  Autodesk, Inc., 3.125%, 6/15/20                               10,463,177
   2,875,000                  Igloo Holdings Corp., 8.25%, 12/15/17 (8.25%
                              Cash, 9.00% PIK) (144A) (PIK)                                  2,910,938
                                                                                     -----------------
                                                                                     $      21,194,228
------------------------------------------------------------------------------------------------------
                              Systems Software -- 0.3%
  10,600,000                  Oracle Corp., 2.5%, 5/15/22                            $      10,292,685
------------------------------------------------------------------------------------------------------
                              Home Entertainment Software -- 0.0%+
     650,000                  Activision Blizzard, Inc., 6.125%, 9/15/23 (144A)      $         697,125
                                                                                     -----------------
                              Total Software & Services                              $      36,972,788
------------------------------------------------------------------------------------------------------


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 49


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                               
                              TECHNOLOGY HARDWARE & EQUIPMENT -- 1.1%
                              Communications Equipment -- 0.3%
   2,860,000                  Brocade Communications Systems, Inc.,
                              4.625%, 1/15/23                                        $       2,767,050
   3,800,000                  Cisco Systems, Inc., 3.0%, 6/15/22                             3,817,974
   3,485,000                  Cisco Systems, Inc., 3.625%, 3/4/24                            3,595,771
                                                                                     -----------------
                                                                                     $      10,180,795
------------------------------------------------------------------------------------------------------
                              Computer Hardware Storage &
                              Peripherals -- 0.6%
   4,600,000                  NCR Corp., 4.625%, 2/15/21                             $       4,611,500
   1,425,000                  NCR Corp., 6.375%, 12/15/23                                    1,510,500
   3,450,000                  Seagate HDD Cayman, 4.75%, 6/1/23                              3,504,055
   3,700,000                  Seagate HDD Cayman, 4.875%, 6/1/27 (144A)                      3,596,644
   4,350,000                  Seagate HDD Cayman, 5.75%, 12/1/34 (144A)                      4,283,101
                                                                                     -----------------
                                                                                     $      17,505,800
------------------------------------------------------------------------------------------------------
                              Electronic Components -- 0.1%
   3,675,000                  Amphenol Corp., 3.125%, 9/15/21                        $       3,677,631
------------------------------------------------------------------------------------------------------
                              Electronic Manufacturing Services -- 0.1%
   2,750,000                  Flextronics International, Ltd., 4.75%,
                              6/15/25 (144A)                                         $       2,728,550
                                                                                     -----------------
                              Total Technology Hardware & Equipment                  $      34,092,776
------------------------------------------------------------------------------------------------------
                              SEMICONDUCTORS & SEMICONDUCTOR
                              EQUIPMENT -- 0.4%
                              Semiconductor Equipment -- 0.1%
   2,500,000                  Entegris, Inc., 6.0%, 4/1/22 (144A)                    $       2,568,750
------------------------------------------------------------------------------------------------------
                              Semiconductors -- 0.3%
  11,075,000                  Intel Corp., 4.8%, 10/1/41                             $      11,109,776
                                                                                     -----------------
                              Total Semiconductors &
                              Semiconductor Equipment                                $      13,678,526
------------------------------------------------------------------------------------------------------
                              TELECOMMUNICATION SERVICES -- 1.3%
                              Integrated Telecommunication Services -- 0.8%
   2,250,000                  AT&T, Inc., 4.75%, 5/15/46                             $       2,047,442
   4,300,000                  Frontier Communications Corp., 7.125%, 1/15/23                 3,816,250
   4,800,000                  GTP Acquisition Partners I LLC, 2.35%,
                              6/15/20 (144A)                                                 4,774,512
     773,645                  GTP Cellular Sites LLC, 3.721%, 3/15/17 (144A)                   783,211
   2,750,000                  Telefonica Emisiones SAU, 6.221%, 7/3/17                       2,989,077
   1,500,000                  Unison Ground Lease Funding LLC, 2.981%,
                              3/16/43 (144A)                                                 1,488,969
   1,938,000                  Verizon Communications, Inc., 5.012%, 8/21/54                  1,778,284
   5,100,000                  Verizon Communications, Inc., 5.15%, 9/15/23                   5,583,689
   1,934,000                  Verizon Communications, Inc., 6.55%, 9/15/43                   2,262,304
                                                                                     -----------------
                                                                                     $      25,523,738
------------------------------------------------------------------------------------------------------


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

50 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Wireless Telecommunication Services -- 0.5%
   1,675,000                  Altice Financing SA, 7.875%, 12/15/19 (144A)           $       1,762,938
   3,015,000                  Crown Castle Towers LLC, 4.883%, 8/15/20 (144A)                3,272,339
   1,625,000                  Crown Castle Towers LLC, 6.113%, 1/15/20 (144A)                1,850,248
   6,975,000                  SBA Tower Trust, 3.869%, 10/15/49 (144A)                       7,023,023
   1,500,000                  Sprint Corp., 7.125%, 6/15/24                                  1,391,400
   1,500,000                  Sprint Corp., 7.25%, 9/15/21                                   1,462,500
                                                                                     -----------------
                                                                                     $      16,762,448
                                                                                     -----------------
                              Total Telecommunication Services                       $      42,286,186
------------------------------------------------------------------------------------------------------
                              UTILITIES -- 3.1%
                              Electric Utilities -- 2.0%
     980,000                  Commonwealth Edison Co., 6.15%, 9/15/17                $       1,079,785
     539,093                  Crockett Cogeneration LP, 5.869%, 3/30/25 (144A)                 566,048
   8,700,000                  Duke Energy Progress, Inc., 4.15%, 12/1/44                     8,407,784
   4,250,000                  Electricite de France SA, 6.0%, 1/22/14 (144A)                 4,525,268
   2,150,000          5.25    Electricite de France SA, Floating Rate Note
                              (Perpetual) (144A)                                             2,152,688
   2,825,000                  Empresa Electrica Angamos SA, 4.875%,
                              5/25/29 (144A)                                                 2,778,246
   3,365,000                  Enel Finance International NV, 5.125%,
                              10/7/19 (144A)                                                 3,689,026
   2,320,000          8.13    Enel S.p.A., Floating Rate Note, 9/24/73 (144A)                2,662,200
   4,250,000                  Exelon Corp., 2.85%, 6/15/20                                   4,274,663
     573,458                  FPL Energy American Wind LLC, 6.639%,
                              6/20/23 (144A)                                                  589,328
      65,461                  FPL Energy Wind Funding LLC, 6.876%,
                              6/27/17 (144A)                                                    65,625
   4,475,000                  Iberdrola International BV, 6.75%, 7/15/36                     5,484,368
   1,925,000                  Israel Electric Corp., Ltd., 7.25%, 1/15/19 (144A)             2,170,438
     610,000                  Israel Electric Corp., Ltd., 9.375%, 1/28/20 (144A)              757,925
     910,000                  Nevada Power Co., 6.5%, 8/1/18                                 1,038,440
     542,991                  Orcal Geothermal, Inc., 6.21%, 12/30/20 (144A)                   564,711
   2,690,000                  Public Service Co. of New Mexico, 7.95%, 5/15/18               3,130,288
   6,200,000                  Southern California Edison Co., 1.845%, 2/1/22                 6,193,881
   2,200,000          6.25    Southern California Edison Co., Floating Rate
                              Note (Perpetual)                                               2,428,800
  10,800,000                  Southwestern Electric Power Co., 3.9%, 4/1/45                  9,401,940
                                                                                     -----------------
                                                                                     $      61,961,452
------------------------------------------------------------------------------------------------------
                              Gas Utilities -- 0.1%
   2,125,000                  DCP Midstream Operating LP, 5.6%, 4/1/44               $       1,895,279
   2,178,211                  Nakilat, Inc., 6.267%, 12/31/33 (144A)                         2,513,111
                                                                                     -----------------
                                                                                     $       4,408,390
------------------------------------------------------------------------------------------------------


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 51


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                               
                              Multi-Utilities -- 0.6%
   5,475,000                  Consolidated Edison Co. of New York, Inc.,
                              4.625%, 12/1/54                                        $       5,331,079
   5,170,000                  Dominion Resources, Inc., Virginia, 3.625%,
                              12/1/24                                                        5,126,551
   5,055,000                  New York State Electric & Gas Corp., 6.15%,
                              12/15/17 (144A)                                                5,576,196
     238,480                  Ormat Funding Corp., 8.25%, 12/30/20                             243,249
   3,150,000                  San Diego Gas & Electric Co., 1.914%, 2/1/22                   3,163,091
                                                                                     -----------------
                                                                                     $      19,440,166
------------------------------------------------------------------------------------------------------
                              Independent Power Producers &
                              Energy Traders -- 0.4%
     546,570                  Alta Wind Holdings LLC, 7.0%, 6/30/35 (144A)           $         635,334
   4,300,000                  Colbun SA, 4.5%, 7/10/24 (144A)                                4,289,534
   1,605,797                  Kiowa Power Partners LLC, 5.737%,
                              3/30/21 (144A)                                                 1,733,779
   2,000,000                  NRG Energy, Inc., 8.25%, 9/1/20                                2,095,000
   2,203,620                  Panoche Energy Center LLC, 6.885%,
                              7/31/29 (144A)                                                 2,538,292
                                                                                     -----------------
                                                                                     $      11,291,939
                                                                                     -----------------
                              Total Utilities                                        $      97,101,947
------------------------------------------------------------------------------------------------------
                              TOTAL CORPORATE BONDS
                              (Cost $1,238,583,390)                                  $   1,240,691,671
------------------------------------------------------------------------------------------------------
                              U.S. GOVERNMENT AND AGENCY
                              OBLIGATIONS -- 27.0%
  46,841,286                  Fannie Mae, 3.0%, 7/16/15-7/1/43                       $      47,266,321
  58,075,840                  Fannie Mae, 3.5%, 7/14/15-9/1/44                              60,147,205
 143,049,311                  Fannie Mae, 4.0%, 8/13/15-2/1/45                             151,876,686
  83,474,317                  Fannie Mae, 4.5%, 10/1/35-1/1/44                              90,386,550
  35,343,639                  Fannie Mae, 5.0%, 12/1/17-2/1/45                              39,089,167
   2,641,896                  Fannie Mae, 5.5%, 9/1/17-6/1/36                                2,929,560
   3,075,934                  Fannie Mae, 6.0%, 6/1/16-7/1/38                                3,507,924
     667,701                  Fannie Mae, 6.5%, 7/1/29-11/1/37                                 766,796
      96,546                  Fannie Mae, 7.0%, 12/1/30-1/1/32                                 110,295
      12,461                  Fannie Mae, 8.0%, 2/1/29-5/1/31                                   14,775
   4,490,661                  Federal Home Loan Mortgage Corp., 3.0%, 8/1/29                 4,664,591
  21,885,010                  Federal Home Loan Mortgage Corp., 3.5%,
                              11/1/28-3/1/45                                                22,601,111
  66,178,594                  Federal Home Loan Mortgage Corp., 4.0%,
                              11/1/41-12/1/44                                               70,282,079
  16,729,374                  Federal Home Loan Mortgage Corp., 4.5%,
                              3/1/20-11/1/43                                                18,092,194
   2,471,827                  Federal Home Loan Mortgage Corp., 5.0%,
                              10/1/20-10/1/38                                                2,680,714


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

52 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                               
                              U.S. GOVERNMENT AND AGENCY
                              OBLIGATIONS -- (continued)
   3,104,734                  Federal Home Loan Mortgage Corp., 5.5%,
                              12/1/18-6/1/41                                         $       3,465,600
   2,897,943                  Federal Home Loan Mortgage Corp., 6.0%,
                              5/1/17-12/1/36                                                 3,300,878
     139,766                  Federal Home Loan Mortgage Corp., 6.5%,
                              11/1/30-4/1/34                                                   161,529
     336,162                  Federal Home Loan Mortgage Corp., 7.0%,
                              8/1/22-11/1/30                                                   368,984
     456,290                  Federal National Mortgage Association,
                              4.0%, 11/1/34                                                    488,464
   1,347,140                  Federal National Mortgage Association, 5.0%, 8/1/40            1,489,720
  32,333,018                  Government National Mortgage Association I,
                              3.5%, 1/15/45-7/15/42                                         33,589,206
  39,681,543                  Government National Mortgage Association I,
                              4.0%, 5/15/39-9/15/44                                         42,256,561
  12,101,477                  Government National Mortgage Association I,
                              4.5%, 7/15/33-8/15/41                                         13,173,374
   1,201,501                  Government National Mortgage Association I,
                              5.0%, 10/15/18-4/15/35                                         1,337,624
   4,673,881                  Government National Mortgage Association I,
                              5.5%, 10/15/17-10/15/35                                        5,244,143
   5,339,162                  Government National Mortgage Association I,
                              6.0%, 1/15/17-10/15/36                                         6,180,455
   2,703,834                  Government National Mortgage Association I,
                              6.5%, 2/15/29-7/15/35                                          3,160,109
     478,164                  Government National Mortgage Association I,
                              7.0%, 4/15/28-5/15/32                                            559,971
      89,247                  Government National Mortgage Association I,
                              7.5%, 2/15/26-12/15/31                                            94,075
       2,389                  Government National Mortgage Association I,
                              7.75%, 2/15/30                                                     2,449
   4,059,051                  Government National Mortgage Association II,
                              4.0%, 10/20/44                                                 4,304,716
   2,930,384                  Government National Mortgage Association II,
                              4.5%, 12/20/34-9/20/41                                         3,199,726
     925,759                  Government National Mortgage Association II,
                              5.5%, 10/20/19-4/20/34                                         1,023,618
      41,008                  Government National Mortgage Association II,
                              6.5%, 2/20/29-4/20/29                                             47,972
     180,937                  Government National Mortgage Association II,
                              7.0%, 11/20/28-12/20/30                                          217,168
  31,575,000                  U.S. Treasury Bonds, 2.5%, 2/15/45                            27,788,526
   6,865,000                  U.S. Treasury Bonds, 4.375%, 11/15/39                          8,443,950
   4,500,000                  U.S. Treasury Bonds, 4.375%, 5/15/40                           5,540,976
   1,150,000                  U.S. Treasury Bonds, 4.375%, 5/15/41                           1,421,329


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 53


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              U.S. GOVERNMENT AND AGENCY
                              OBLIGATIONS -- (continued)
  30,000,000                  U.S. Treasury Bonds, 4.5%, 2/15/36                     $      37,720,320
  64,349,449                  U.S. Treasury Inflation Indexed Bonds,
                              0.125%, 7/15/24                                               62,755,773
  11,325,000          0.06    U.S. Treasury Note, Floating Rate Note, 1/31/16               11,324,909
  11,325,000          0.08    U.S. Treasury Note, Floating Rate Note, 4/30/16               11,327,174
  11,325,000          0.08    U.S. Treasury Note, Floating Rate Note, 7/31/16               11,327,639
  16,435,000          0.09    U.S. Treasury Note, Floating Rate Note, 1/31/17               16,443,661
  16,395,000          0.09    U.S. Treasury Note, Floating Rate Note, 4/30/17               16,393,541
   4,400,000                  U.S. Treasury Notes, 2.0%, 2/15/25                             4,274,873
                                                                                     -----------------
                                                                                     $     852,844,981
------------------------------------------------------------------------------------------------------
                              TOTAL U.S. GOVERNMENT AND
                              AGENCY OBLIGATIONS
                              (Cost $851,646,715)                                    $     852,844,981
------------------------------------------------------------------------------------------------------
                              FOREIGN GOVERNMENT BOND -- 0.1%
   4,550,000                  Africa Finance Corp., 4.375%, 4/29/20 (144A)           $       4,595,500
------------------------------------------------------------------------------------------------------
                              TOTAL FOREIGN GOVERNMENT BOND
                              (Cost $4,507,102)                                      $       4,595,500
------------------------------------------------------------------------------------------------------
                              MUNICIPAL BONDS -- 2.6%
                              Municipal Airport -- 0.0%+
   1,000,000                  Indianapolis Airport Authority, 5.1%, 1/15/17          $       1,062,110
------------------------------------------------------------------------------------------------------
                              Municipal Development -- 0.5%
   2,925,000                  California Statewide Communities Development
                              Authority, 6.0%, 8/15/42                               $       3,466,096
   2,350,000                  Louisiana Local Government Environmental
                              Facilities & Community Development Authority,
                              6.5%, 11/1/35                                                  2,797,346
   4,500,000                  New Jersey Economic Development Authority,
                              2/15/18 (d)                                                    4,153,365
   2,560,000                  Parish of St. John the Baptist Louisiana,
                              5.125%, 6/1/37                                                 2,685,030
   2,310,000                  Selma Industrial Development Board, 5.8%, 5/1/34               2,631,390
                                                                                     -----------------
                                                                                     $      15,733,227
------------------------------------------------------------------------------------------------------
                              Municipal Education -- 0.0%+
     525,000                  Amherst College, 3.794%, 11/1/42                       $         493,486
------------------------------------------------------------------------------------------------------
                              Municipal General -- 0.6%
   4,075,000                  JobsOhio Beverage System, 3.985%, 1/1/29               $       4,213,794
   1,035,000                  JobsOhio Beverage System, 4.532%, 1/1/35                       1,076,048
   2,750,000                  New Jersey Transportation Trust Fund Authority,
                              Transportation System-Series A, 5.5%, 6/15/41                  2,874,080
   2,400,000                  New York City Transitional Finance Authority Future
                              Tax Secured Revenue, 5.0%, 11/1/33                             2,732,592


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

54 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                               
                              Municipal General -- (continued)
   1,050,000                  Texas Municipal Gas Acquisition & Supply Corp., III,
                              5.0%, 12/15/30                                         $       1,132,562
   2,100,000                  Texas Municipal Gas Acquisition & Supply Corp., III,
                              5.0%, 12/15/31                                                 2,259,474
   2,200,000                  Virginia Commonwealth Transportation Board,
                              4.0%, 5/15/31                                                  2,302,036
   2,210,000                  Virginia Commonwealth Transportation Board,
                              4.0%, 5/15/32                                                  2,300,455
                                                                                     -----------------
                                                                                     $      18,891,041
------------------------------------------------------------------------------------------------------
                              Municipal Higher Education -- 0.7%
   1,025,000                  Baylor University, 4.313%, 3/1/42                      $       1,015,006
   1,980,000                  California Educational Facilities Authority,
                              5.0%, 6/1/43                                                   2,494,067
   1,425,000                  Massachusetts Health & Educational Facilities
                              Authority, Massachusetts Institute of
                              Technology -Series K, 5.5%, 7/1/32                             1,874,331
   1,100,000                  Massachusetts Institute of Technology,
                              5.6%, 7/1/11                                                   1,321,047
   3,100,000                  New Jersey Educational Facilities Authority,
                              4.0%, 7/1/45                                                   3,192,876
     800,000                  Permanent University Fund, 5.0%, 7/1/30                          940,408
   3,095,000                  President and Fellows of Harvard College,
                              6.3%, 10/1/37                                                  3,226,528
   1,900,000                  The George Washington University, 1.827%, 9/15/17              1,925,631
     525,000                  The University of Texas System, 5.0%, 8/15/43                    589,386
   2,600,000                  University of California, 3.38%, 5/15/28                       2,545,296
   3,100,000                  University of Virginia, 5.0%, 4/1/45                           3,544,602
                                                                                     -----------------
                                                                                     $      22,669,178
------------------------------------------------------------------------------------------------------
                              Municipal Medical -- 0.1%
     325,000                  Massachusetts Development Finance Agency,
                              5.25%, 4/1/37                                          $         363,890
     550,000                  Massachusetts Development Finance Agency,
                              Broad Institute -Series A, 5.375%, 4/1/41                        607,354
   1,765,000                  Ohio Higher Educational Facility Commission,
                              5.0%, 1/1/42                                                   1,918,943
                                                                                     -----------------
                                                                                     $       2,890,187
------------------------------------------------------------------------------------------------------
                              Municipal Pollution -- 0.2%
   3,965,000                  Port Freeport Texas, 5.95%, 5/15/33                    $       4,433,941
------------------------------------------------------------------------------------------------------
                              Municipal School District -- 0.1%
   2,700,000                  Frisco Independent School District, 4.0%, 8/15/40      $       2,721,384
   1,700,000                  Frisco Independent School District, 4.0%, 8/15/45              1,706,681
                                                                                     -----------------
                                                                                     $       4,428,065
------------------------------------------------------------------------------------------------------


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 55


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Municipal Transportation -- 0.1%
     600,000                  Port Authority of New York & New Jersey,
                              4.458%, 10/1/62                                        $         574,374
   1,000,000                  Texas Transportation Commission State Highway
                              Fund, 5.0%, 4/1/33                                             1,147,110
                                                                                     -----------------
                                                                                     $       1,721,484
------------------------------------------------------------------------------------------------------
                              Municipal Obligation -- 0.3%
   3,000,000                  State of Texas, 4.0%, 10/1/44                          $       3,062,760
     560,000                  State of Washington, 3.0%, 7/1/28                                557,183
   1,600,000                  State of Washington, 5.0%, 7/1/30                              1,854,272
   1,620,000                  Washington Suburban Sanitary Commission,
                              4.0%, 6/1/43                                                   1,651,655
   1,565,000                  Washington Suburban Sanitary Commission,
                              4.0%, 6/1/44                                                   1,594,391
                                                                                     -----------------
                                                                                     $       8,720,261
------------------------------------------------------------------------------------------------------
                              TOTAL MUNICIPAL BONDS
                              (Cost $77,067,483)                                     $      81,042,980
------------------------------------------------------------------------------------------------------
                              SENIOR FLOATING RATE LOAN
                              INTERESTS -- 3.0%**
                              ENERGY -- 0.0%+
                              Integrated Oil & Gas -- 0.0%+
     598,085          4.50    Glenn Pool Oil & Gas Trust, Term Loan, 5/2/16          $         596,590
                                                                                     -----------------
                              Total Energy                                           $         596,590
------------------------------------------------------------------------------------------------------
                              MATERIALS -- 0.2%
                              Commodity Chemicals -- 0.0%+
     764,864          4.25    Tronox Pigments Holland BV, New Term Loan,
                              3/19/20                                                $         766,394
------------------------------------------------------------------------------------------------------
                              Diversified Chemicals -- 0.0%+
     194,134          4.25    OXEA Sarl, Tranche B-2 Term Loan (First Lien),
                              1/15/20                                                $         188,067
------------------------------------------------------------------------------------------------------
                              Specialty Chemicals -- 0.1%
     154,286          3.50    Chemtura Corp., New Term Loan, 8/29/16                 $         154,543
     252,086          2.73    Huntsman International LLC, Extended Term B
                              Loan, 4/19/17                                                    252,242
     911,524          4.50    MacDermid, Inc., Tranche B Term Loan
                              (First Lien), 6/7/20                                             914,847
     477,500          4.25    OMNOVA Solutions, Inc., Term B-1 Loan, 5/31/18                   477,948
     238,745          2.75    WR Grace & Co-Conn, Term Loan, 1/23/21                           238,809
     663,448          2.75    WR Grace & Co-Conn, U.S. Term Loan, 1/23/21                      663,626
                                                                                     -----------------
                                                                                     $       2,702,015
------------------------------------------------------------------------------------------------------
                              Construction Materials -- 0.1%
   1,043,696          4.25    CeramTec Service GmbH, Initial Dollar Term B-1
                              Loan, 8/30/20                                          $       1,045,653
------------------------------------------------------------------------------------------------------


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

56 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Metal & Glass Containers -- 0.0%+
     198,000          5.50    BWay Intermediate, Initial Term Loan, 8/14/20          $         199,268
------------------------------------------------------------------------------------------------------
                              Aluminum -- 0.0%+
     700,000          4.00    Novelis, Inc., 1st Lien Term Loan 5/28/22              $         697,375
------------------------------------------------------------------------------------------------------
                              Diversified Metals & Mining -- 0.0%+
     417,005          3.75    Fortescue Metals Group, Ltd., Bank Loan, 6/30/19       $         371,265
                                                                                     -----------------
                              Total Materials                                        $       5,970,037
------------------------------------------------------------------------------------------------------
                              CAPITAL GOODS -- 0.2%
                              Aerospace & Defense -- 0.2%
   1,204,479          6.25    DAE Aviation Holdings, Inc., Replacement
                              Tranche B-1 Loan, 11/2/18                              $       1,207,792
   2,569,902          3.75    DigitalGlobe, Inc., Term Loan, 1/25/20                         2,575,525
     425,419          6.25    DynCorp International, Inc., Term Loan, 7/7/16                   421,342
     544,335          5.00    Standard Aero, Ltd., Replacement Tranche B-2
                              Loan, 11/2/18                                                    546,203
     641,293          7.00    TASC, Inc., First Lien Term Loan, 2/28/17                        649,042
                                                                                     -----------------
                                                                                     $       5,399,904
------------------------------------------------------------------------------------------------------
                              Building Products -- 0.0%+
   1,375,946          3.50    Nortek, Inc., Term Loan, 10/30/20                      $       1,370,212
------------------------------------------------------------------------------------------------------
                              Industrial Conglomerates -- 0.0%+
     105,893          4.25    CeramTec Acquisition Corp., Initial Dollar Term B-2
                              Loan, 8/30/20                                          $         106,091
     314,222          4.25    CeramTec GmbH, Dollar Term B-3 Loan, 8/30/20                     314,811
                                                                                     -----------------
                                                                                     $         420,902
------------------------------------------------------------------------------------------------------
                              Trading Companies & Distributors -- 0.0%+
     590,405          3.75    WESCO Distribution, Inc., Tranche B-1
                              Loan, 12/12/19                                         $         591,143
                                                                                     -----------------
                              Total Capital Goods                                    $       7,782,161
------------------------------------------------------------------------------------------------------
                              COMMERCIAL SERVICES & SUPPLIES -- 0.0%+
                              Security & Alarm Services -- 0.0%+
     202,752          4.00    Garda World Security Corp., Term B Loan, 11/8/20       $         202,414
     792,577          4.00    Garda World Security Corp., Term B Loan, 11/1/20                 791,256
                                                                                     -----------------
                                                                                     $         993,670
                                                                                     -----------------
                              Total Commercial Services & Supplies                   $         993,670
------------------------------------------------------------------------------------------------------
                              TRANSPORTATION -- 0.1%
                              Airlines -- 0.1%
   1,641,451          3.25    Delta Air Lines, Inc., Term Loan, 4/20/17              $       1,641,040
------------------------------------------------------------------------------------------------------
                              Marine -- 0.0%+
     653,165          5.25    Navios Maritime Partners LP, Term Loan, 6/27/18        $         652,757
                                                                                     -----------------
                              Total Transportation                                   $       2,293,797
------------------------------------------------------------------------------------------------------


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 57


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              AUTOMOBILES & COMPONENTS -- 0.4%
                              Auto Parts & Equipment -- 0.2%
     532,336          3.50    Allison Transmission, Inc., Term B-3 Loan, 8/23/19     $       1,135,144
   1,131,432          4.00    Cooper Standard Intermediate Holdco 2 LLC,
                              Term Loan, 3/28/21                                             1,736,481
   1,736,842          4.25    Remy International, Inc., Term B Loan 2013, 3/5/20             1,717,140
   1,714,996          0.00    TI Group Automotive Systems LLC, 1st Lien Term
                              Loan B, 6/25/22 (f)                                              531,671
                                                                                     -----------------
                                                                                     $       5,120,436
------------------------------------------------------------------------------------------------------
                              Tires & Rubber -- 0.1%
   3,491,667          3.75    The Goodyear Tire & Rubber Co., Term Loan
                              (Second Lien), 3/27/19                                 $       3,502,578
------------------------------------------------------------------------------------------------------
                              Automobile Manufacturers -- 0.1%
   3,758,400          3.50    Chrysler Group LLC, Term Loan B, 5/24/17               $       3,758,723
                                                                                     -----------------
                              Total Automobiles & Components                         $      12,381,737
------------------------------------------------------------------------------------------------------
                              CONSUMER DURABLES & APPAREL -- 0.0%+
                              Apparel, Accessories & Luxury Goods -- 0.0%+
     498,750          3.25    Hanesbrands Inc., US, 1st Lien Term Loan, 4/15/22      $         502,179
     384,612          3.25    PVH Corp., Tranche B Term Loan, 12/19/19                         386,856
                                                                                     -----------------
                                                                                     $         889,035
                                                                                     -----------------
                              Total Consumer Durables & Apparel                      $         889,035
------------------------------------------------------------------------------------------------------
                              CONSUMER SERVICES -- 0.2%
                              Casinos & Gaming -- 0.2%
     688,943          3.75    Pinnacle Entertainment, Inc., Tranche B-2 Term
                              Loan, 8/13/20                                          $         689,619
   4,328,250          6.00    Scientific Games, Initial Term B-2, 10/1/21                    4,330,462
                                                                                     -----------------
                                                                                     $       5,020,081
------------------------------------------------------------------------------------------------------
                              Restaurants -- 0.0%+
     364,309          3.75    1011778 BC ULC, Term B-2 Loan, 12/12/21                $         364,537
                                                                                     -----------------
                              Total Consumer Services                                $       5,384,618
------------------------------------------------------------------------------------------------------
                              MEDIA -- 0.3%
                              Advertising -- 0.0%+
   1,059,566          6.75    Affinion Group, Inc., Tranche B Term Loan, 4/30/18     $       1,021,157
------------------------------------------------------------------------------------------------------
                              Broadcasting -- 0.1%
   2,253,902          4.00    Univision Communications, Inc., Replacement First-
                              Lien Term Loan, 3/1/20                                 $       2,242,319
------------------------------------------------------------------------------------------------------
                              Cable & Satellite -- 0.1%
   1,690,500          3.00    Charter Communications Operating LLC, Term F
                              Loan, 1/1/21                                           $       1,672,011
     147,202          4.50    WideOpenWest Finance LLC, Replacement Term B
                              Loan, 4/1/19                                                     147,276
                                                                                     -----------------
                                                                                     $       1,819,287
------------------------------------------------------------------------------------------------------


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

58 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Movies & Entertainment -- 0.1%
     318,163          3.75    Cinedigm Digital Funding 1 LLC, Term
                              Loan, 2/28/18                                          $         318,561
   1,400,063          3.50    Live Nation Entertainment, Inc., Term B-1
                              Loan, 8/17/20                                                  1,402,093
                                                                                     -----------------
                                                                                     $       1,720,654
------------------------------------------------------------------------------------------------------
                              Publishing -- 0.0%+
     743,042          4.75    Interactive Data Corp., Tranche B Term Loan (First
                              Lien), 4/24/21                                         $         746,138
                                                                                     -----------------
                              Total Media                                            $       7,549,555
------------------------------------------------------------------------------------------------------
                              RETAILING -- 0.1%
                              General Merchandise Stores -- 0.0%+
     666,667          3.50    Dollar Tree, Inc., 1st Lien Term Loan-B1 3/9/22        $         667,778
------------------------------------------------------------------------------------------------------
                              Specialty Stores -- 0.1%
   1,925,000          3.50    Staples, Inc., 1st Lien Term Loan B, 4/24/21           $       1,925,133
                                                                                     -----------------
                              Total Retailing                                        $       2,592,911
------------------------------------------------------------------------------------------------------
                              FOOD, BEVERAGE & TOBACCO -- 0.0%+
                              Agricultural Products -- 0.0%+
   1,239,313          3.25    Darling International, Inc., Term B USD
                              Loan, 12/19/20                                         $       1,246,672
------------------------------------------------------------------------------------------------------
                              Packaged Foods & Meats -- 0.0%+
      20,755          3.00    Pinnacle Foods Finance LLC, New Term Loan G,
                              4/29/20                                                $          20,692
                                                                                     -----------------
                              Total Food, Beverage & Tobacco                         $       1,267,364
------------------------------------------------------------------------------------------------------
                              HOUSEHOLD & PERSONAL PRODUCTS -- 0.1%
                              Personal Products -- 0.1%
   1,422,330          4.75    Federal-Mogul Corp., Tranche C Term, 4/15/21           $       1,408,462
     861,429          3.50    NBTY, Inc., Term B-2 Loan, 10/1/17                               857,121
     977,058          4.00    Revlon Consumer Products Corp., Acquisition
                              Term Loan, 8/19/19                                               978,737
                                                                                     -----------------
                                                                                     $       3,244,320
                                                                                     -----------------
                              Total Household & Personal Products                    $       3,244,320
------------------------------------------------------------------------------------------------------
                              HEALTH CARE EQUIPMENT & SERVICES -- 0.4%
                              Health Care Equipment -- 0.1%
   1,988,646          4.50    Kinetic Concepts, Inc., Term DTL-E1 loan, 5/4/18       $       1,998,899
------------------------------------------------------------------------------------------------------
                              Health Care Supplies -- 0.1%
   2,123,082          5.00    Immucor, Inc., Term B-2 Loan, 8/19/18                  $       2,133,698
------------------------------------------------------------------------------------------------------


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 59


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Health Care Services -- 0.0%+
     498,319          6.75    Ardent Medical Services, Inc., 1st Lien Term
                              Loan, 5/2/18                                           $         499,980
     251,141          3.50    DaVita HealthCare Partners, Inc., Tranche B Loan
                              (First Lien), 6/19/21                                            251,534
                                                                                     -----------------
                                                                                     $         751,514
------------------------------------------------------------------------------------------------------
                              Health Care Facilities -- 0.2%
     338,300          5.25    Capella Healthcare, Inc., Tranche B Term Loan
                              (First Lien), 12/31/21                                 $         339,146
     592,659          3.53    CHS, Incremental 2018 Term F Loans, 12/31/18                     592,870
   1,119,878          3.03    CHS, Incremental 2019 Term G Loan, 12/31/19                    1,121,278
   2,060,545          4.00    CHS, Incremental 2021 Term H Loan, 1/27/21                     2,065,839
     734,812          3.03    HCA, Inc., Tranche B-4 Term Loan, 5/1/18                         735,628
   1,762,225          2.94    HCA, Inc., Tranche B-5 Term Loan, 3/31/17                      1,763,437
                                                                                     -----------------
                                                                                     $       6,618,198
------------------------------------------------------------------------------------------------------
                              Health Care Technology -- 0.0%+
     451,525          3.50    IMS Health, Inc., Term B Dollar Loan, 3/17/21          $         449,197
                                                                                     -----------------
                              Total Health Care Equipment & Services                 $      11,951,506
------------------------------------------------------------------------------------------------------
                              PHARMACEUTICALS, BIOTECHNOLOGY & LIFE
                              SCIENCES -- 0.2%
                              Biotechnology -- 0.0%+
     746,164          3.50    Alkermes, Inc., 2019 Term Loan, 9/25/19                $         747,252
------------------------------------------------------------------------------------------------------
                              Pharmaceuticals -- 0.2%
   2,012,986          3.25    Endo Luxembourg Finance I Co., S.a.r.l., Tranche B
                              Term Loan (First Lien), 11/5/20                        $       2,017,390
     385,125          3.19    Grifols Worldwide Operations USA, Inc., U.S.
                              Tranche B Term Loam, 4/1/21                                      385,626
   1,648,573          3.50    RPI Finance Trust, Term B-4 Term Loan, 11/9/20                 1,651,870
     532,996          3.04    Valeant Pharmaceuticals International, Inc.,
                              Series C-2 Tranche B Term Loan, 12/11/19                         532,589
     997,500          4.00    Valeant Pharmaceuticals, Series F-1, 3/11/22                     998,180
                                                                                     -----------------
                                                                                     $       5,585,655
------------------------------------------------------------------------------------------------------
                              Life Sciences Tools & Services -- 0.0%+
   1,637,121          4.25    Catalent Pharma Solutions, Dollar Term
                              Loan, 5/20/21                                          $       1,642,237
                                                                                     -----------------
                              Total Pharmaceuticals, Biotechnology &
                              Life Sciences                                          $       7,975,144
------------------------------------------------------------------------------------------------------
                              DIVERSIFIED FINANCIALS -- 0.1%
                              Other Diversified Financial Services -- 0.0%+
     795,333          5.25    WorldPay, Facility B2A Term Loan, 8/6/17               $         800,801
------------------------------------------------------------------------------------------------------


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

60 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Specialized Finance -- 0.1%
   1,492,443          3.75    Trans Union LLC, 1st Lien Term Loan-B2 4/9/21          $       1,482,183
                                                                                     -----------------
                              Total Diversified Financials                           $       2,282,984
------------------------------------------------------------------------------------------------------
                              INSURANCE -- 0.2%
                              Insurance Brokers -- 0.2%
   1,161,227          4.50    National Financial Partners Corp., Tranche B
                              Term Loan (First Lien), 7/1/20                         $       1,162,679
   6,177,456          4.25    USI Insurance Services LLC, Term B Loan, 12/30/19              6,189,039
                                                                                     -----------------
                                                                                     $       7,351,718
                                                                                     -----------------
                              Total Insurance                                        $       7,351,718
------------------------------------------------------------------------------------------------------
                              SOFTWARE & SERVICES -- 0.1%
                              IT Consulting & Other Services -- 0.0%+
     953,650          3.93    SunGard Data Systems, Inc., Tranche C Term
                              Loan, 2/28/17                                          $         955,284
------------------------------------------------------------------------------------------------------
                              Application Software -- 0.0%+
     368,859          2.94    Nuance Communications, Inc., Term C Loan, 8/7/19       $         366,323
------------------------------------------------------------------------------------------------------
                              Systems Software -- 0.0%+
     606,950          5.75    AVG Technologies NV, Term Loan, 10/15/20               $         609,985
------------------------------------------------------------------------------------------------------
                              Home Entertainment Software -- 0.1%
   1,146,608          3.25    Activision Blizzard, Inc., Term Loan, 7/26/20          $       1,150,907
                                                                                     -----------------
                              Total Software & Services                              $       3,082,499
------------------------------------------------------------------------------------------------------
                              TECHNOLOGY HARDWARE & EQUIPMENT -- 0.0%+
                              Communications Equipment -- 0.0%+
     342,733          3.25    Commscope, Inc., Tranche 4 Term Loan, 1/14/18          $         343,074
                                                                                     -----------------
                              Total Technology Hardware & Equipment                  $         343,074
------------------------------------------------------------------------------------------------------
                              SEMICONDUCTORS & SEMICONDUCTOR
                              EQUIPMENT -- 0.1%
                              Semiconductor Equipment -- 0.1%
   1,166,202          2.53    Sensata Technologies, 1st Lien Term
                              Loan, 10/14/21                                         $       1,171,513
------------------------------------------------------------------------------------------------------
                              Semiconductors -- 0.0%+
     324,504          3.75    Avago Technologies, Ltd., Tranche B Term Loan
                              (First Lien), 4/16/21                                  $         325,426
     350,189          2.78    Microsemi Corp., Term Loan (First Lien), 3/14/21                 350,714
                                                                                     -----------------
                                                                                     $         676,140
                                                                                     -----------------
                              Total Semiconductors & Semiconductor Equipment         $       1,847,653
------------------------------------------------------------------------------------------------------
                              TELECOMMUNICATION SERVICES -- 0.2%
                              Integrated Telecommunication Services -- 0.1%
   1,920,788          4.00    Cincinnati Bell, Inc., Tranche B Term Loan, 9/10/20    $       1,921,187
------------------------------------------------------------------------------------------------------


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 61


Schedule of Investments | 6/30/15 (continued)



------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                            
                              Wireless Telecommunication Services -- 0.1%
   1,492,424          3.00    Crown Castle International Corp., Tranche B-2
                              Term Loan (First Lien), 1/31/21                        $       1,486,268
   1,211,963          4.75    GCI Holdings, Inc., Tranche B Term Loan (First
                              Lien), 12/22/21                                                1,219,537
     333,333          4.00    Syniverse Holdings, Inc., Initial Term Loan, 4/23/19             315,833
     666,667          4.00    Syniverse Holdings, Inc., Tranche B Term
                              Loan, 4/23/19                                                    631,667
                                                                                     -----------------
                                                                                     $       3,653,305
                                                                                     -----------------
                              Total Telecommunication Services                       $       5,574,492
------------------------------------------------------------------------------------------------------
                              UTILITIES -- 0.1%
                              Electric Utilities -- 0.0%+
   1,285,660          3.75    Texas Competitive Electric Holdings Co., LLC, DIP
                              Term Loan (2014), 5/5/16                               $       1,291,285
------------------------------------------------------------------------------------------------------
                              Independent Power Producers & Energy
                              Traders -- 0.1%
   1,018,588          4.00    Dynegy, Inc., Tranche B-2 Term Loan, 4/23/20           $       1,021,665
   1,315,739          2.75    NRG Energy, Inc., Term Loan (2013), 7/1/18                     1,306,941
     746,113          3.75    NSG Holdings LLC, New Term Loan, 12/11/19                        744,248
                                                                                     -----------------
                                                                                     $       3,072,854
                                                                                     -----------------
                              Total Utilities                                        $       4,364,139
------------------------------------------------------------------------------------------------------
                              TOTAL SENIOR FLOATING RATE LOAN INTERESTS
                              (Cost $94,414,419)                                     $      95,719,004
------------------------------------------------------------------------------------------------------
                              TEMPORARY CASH INVESTMENTS -- 0.5%
                              Repurchase Agreements -- 0.5%
   3,800,000                  $3,800,000 Bank of Nova Scotia, 0.14%, dated
                              6/30/15 plus accrued interest on 7/1/15
                              collateralized by the following:
                              $603,037 Freddie Mac Giant, 3.0%-4.0%,
                              8/1/27 - 1/1/45
                              $3,272,978 Federal National Mortgage
                              Association, 3.0%, 12/1/29                             $       3,800,000
  11,220,000                  $11,220,000 RBC Capital Markets, Inc., 0.10%,
                              dated 6/30/15 plus accrued interest on
                              7/1/15 collateralized by the following:
                              $4,368,411 Federal National Mortgage
                              Association, 3.0-5.5%, 2/1/26-1/1/45
                              $4,601,828 Federal Home Loan Mortgage Corp.,
                              2.157-2.68%, 5/1/42-11/1/42
                              $2,474,162 Federal National Mortgage
                              Association (ARM), 2.694-4.867%,
                              9/1/33-6/1/45                                                 11,220,000
                                                                                     -----------------
                                                                                     $      15,020,000
------------------------------------------------------------------------------------------------------
                              TOTAL TEMPORARY CASH INVESTMENTS
                              (Cost $15,020,000)                                     $      15,020,000
------------------------------------------------------------------------------------------------------


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

62 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------
                Floating
Principal       Rate (b)
Amount ($)      (unaudited)                                                          Value
------------------------------------------------------------------------------------------------------
                                                                               
                              TOTAL INVESTMENT IN SECURITIES -- 96.6%
                              (Cost $3,043,245,224) (a)                              $   3,052,717,217
------------------------------------------------------------------------------------------------------
                              OTHER ASSETS & LIABILITIES -- 3.4%                     $     107,711,216
------------------------------------------------------------------------------------------------------
                              TOTAL NET ASSETS -- 100.0%                             $   3,160,428,433
======================================================================================================


REIT        Real Estate Investment Trust.

+           Rounds to less than 0.01%.

(PIK)       Represents a pay-in kind security.

(Perpetual) Security with no stated maturity date.

(Cat Bond)  Catastrophe or Event Linked Bond. At June 30, 2015, the value of
            these securities amounted to $49,730,705, or 1.6% of total net
            assets. See Notes to Financial Statements -- Note 1F.

REMICS      Real Estate Mortgage Investment Conduits.

ARM         Adjustable Rate Mortgage.

(Step)      Bond issued with an initial coupon rate which converts to a higher
            rate at a later date.

(144A)      Security is exempt from registration under Rule 144A of the
            Securities Act of 1933. Such securities may be resold normally to
            qualified institutional buyers in a transaction exempt from
            registration. At June 30, 2015, the value of these securities
            amounted to $825,022,179 or 26.1% of total net assets.

**          Senior floating rate loan interests in which the Fund invests
            generally pay interest at rates that are periodically redetermined
            by reference to a base lending rate plus a premium. These base
            lending rates are generally (i) the lending rate offered by one or
            more major European banks, such as LIBOR (London InterBank Offered
            Rate), (ii) the prime rate offered by one or more major U.S. banks,
            (iii) the rate of a certificate of deposit or (iv) other base
            lending rates used by commercial lenders. The rate shown is the
            coupon rate at period end.

(a)         At June 30, 2015, the net unrealized appreciation on investments
            based on cost for federal income tax purposes of $3,047,848,363 was
            as follows:



                                                                                  
              Aggregate gross unrealized appreciation for all investments in which
                there is an excess of value over tax cost                            $  42,909,739

              Aggregate gross unrealized depreciation for all investments in which
                there is an excess of tax cost over value                              (38,040,885)
                                                                                     -------------
              Net unrealized appreciation                                            $   4,868,854
                                                                                     =============


(b)         Debt obligation with a variable interest rate. Rate shown is rate at
            end of period.

(c)         Security represents the interest only portion of payments on a pool
            of underlying mortgages or mortgage-backed securities.

(d)         Security issued with a zero coupon. Income is earned through
            accretion of discount.

(e)         Security is valued using fair value methods (other than prices
            supplied by independent pricing services or broker-dealers). See
            Notes to Financial Statements -- Note 1A.

(f)         Rate to be determined.

(g)         Structured reinsurance investment. At June 30, 2015, the value of
            these securities amounted to $46,774,160 or 1.5% of total net
            assets. See Notes to Financial Statements -- Note 1F.

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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 63


Schedule of Investments | 6/30/15 (continued)

Purchases and sales of securities (excluding temporary cash investments) for the
year ended June 30, 2015 were as follows:



            --------------------------------------------------------------------
                                                   Purchases       Sales
            --------------------------------------------------------------------
                                                             
            Long-Term U.S. Government Securities   1,929,259,090   1,494,775,263
            Other Long-Term Securities             1,532,994,714     443,900,716


CENTRALLY CLEARED CREDIT DEFAULT SWAP AGREEMENTS -- SELL PROTECTION



------------------------------------------------------------------------------------------------------
Notional                        Obligation             Credit     Expiration  Premiums  Net Unrealized
Principal ($)(1)  Counterparty  Entity/Index   Coupon  Rating(2)  Date        Paid      Appreciation
------------------------------------------------------------------------------------------------------
                                                                   
25,000,000        Chicago       MARKIT CDX
                   Mercentile    North America
                   Exchange      Investment
                                 Grade Index   1.00%   BBB+       12/20/19    $316,361  $34,098
------------------------------------------------------------------------------------------------------


(1)  The notional amount is the maximum amount that a seller of credit
     protection would be obligated to pay upon occurrence of a credit event.

(2)  Based on Standard & Poor's rating of the issuer or weighted average of all
     the underlying securities of the index.

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

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

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

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

Generally, equity securities are categorized as Level 1, fixed income securities
and senior loans as Level 2 and securities valued using fair value methods
(other than prices supplied by independent pricing services or broker-dealers)
as Level 3. See Notes to Financial Statements -- Note 1A.

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

64 Pioneer Bond Fund | Annual Report | 6/30/15


The following is a summary of the inputs used as of June 30, 2015, in valuing
the Fund's assets:



-------------------------------------------------------------------------------------------------------
                                         Level 1      Level 2            Level 3        Total
-------------------------------------------------------------------------------------------------------
                                                                            
Preferred Stocks
   Banks
        Regional Banks                   $ 2,541,166  $       2,884,876  $          --  $    5,426,042
   Diversified Financials
        Consumer Finance                          --          1,269,336             --       1,269,336
   Insurance
        Property & Casualty
           Insurance                       4,957,198          3,854,612             --       8,811,810
        Reinsurance                               --                 --         36,000          36,000
   All Other Preferred Stocks             22,959,209                 --             --      22,959,209
Convertible Preferred Stock                6,591,750                 --             --       6,591,750
Asset Backed Securities                           --        160,941,239             --     160,941,239
Collateralized Mortgage Obligations               --        556,767,695             --     556,767,695
Corporate Bonds
   Diversified Financials
        Other Diversified
           Financial Services                     --         24,979,167      1,099,140      26,078,307
   Insurance
        Reinsurance                               --                 --     44,178,160      44,178,160
   All Other Corporate Bonds                      --      1,170,435,204             --   1,170,435,204
U.S. Government Agency Obligations                --        852,844,981             --     852,844,981
Foreign Government Bond                           --          4,595,500             --       4,595,500
Municipal Bonds                                   --         81,042,980             --      81,042,980
Senior Floating Rate Loan Interests               --         95,719,004             --      95,719,004
Repurchase Agreements                             --         15,020,000             --      15,020,000
-------------------------------------------------------------------------------------------------------
Total                                    $37,049,323  $   2,970,354,594  $  45,313,300  $3,052,717,217
=======================================================================================================
Other Financial Instruments
Net unrealized appreciation on
   Futures Contracts                     $ 4,828,656  $              --  $          --  $    4,828,656
Net unrealized appreciation on
   Centrally Cleared Swap Contracts               --             34,098             --          34,098
-------------------------------------------------------------------------------------------------------
Total Other Financial
   Instruments                           $ 4,828,656  $          34,098  $          --  $    4,862,754
=======================================================================================================


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 65


Schedule of Investments | 6/30/15 (continued)

Following is a reconciliation of assets using significant unobservable inputs
(Level 3):



-------------------------------------------------------------------------------------------------------
                                                               Preferred     Corporate
                                                               Stocks        Bonds         Total
-------------------------------------------------------------------------------------------------------
                                                                                  
Balance as of 6/30/14                                          $ 2,081,052   $ 4,383,603   $ 6,464,655
Realized gain (loss)(1)                                                 --           361           361
Change in unrealized appreciation (depreciation)(2)                     --     1,584,729     1,584,729
Net purchases                                                       36,000    40,914,524    40,950,524
Net sales                                                               --    (3,686,969)   (3,686,969)
Transfers in to Level 3*                                                --            --            --
Transfers out of Level 3*                                               --            --            --
Transfers in and out of Level 3 activity                        (2,081,052)    2,081,052            --
-------------------------------------------------------------------------------------------------------
Balance as of 6/30/15                                          $    36,000   $45,277,300   $45,313,300
=======================================================================================================


1    Realized gain (loss) on these securities is included in the net realized
     gain (loss) from investments in the Statement of Operations.

2    Unrealized appreciation (depreciation) on these securities is included in
     the change in unrealized appreciation (depreciation) on investments in the
     Statement of Operations.

*    Transfers are calculated on the beginning of period values.

     During the year ended June 30, 2015, there were no transfers between Levels
     1, 2 and 3.



                                                                                        
     Net change in unrealized appreciation (depreciation) of investments still
     held as of 6/30/15                                                                    $ 1,584,729
                                                                                           -----------


The following is a summary of the valuation of certain Fund's assets and
liabilities as of June 30, 2015.



-------------------------------------------------------------------------------------------------------
                                           Level 1          Level 2       Level 3           Total
-------------------------------------------------------------------------------------------------------
                                                                                
Assets:
Futures collateral                         $          --    $5,608,450    $           --    $5,608,450
Centrally cleared swap collateral                     --       500,000                --       500,000
Credit default swaps,
   premiums paid                                      --       316,361                --       316,361
Variation margin for
   futures contracts                             133,025            --                --       133,025
Liabilities:
Variation margin for centrally
   cleared swap contracts                             --        21,705                --        21,705
-------------------------------------------------------------------------------------------------------
Total:                                     $     133,025    $6,446,516    $           --    $6,579,541
=======================================================================================================


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

66 Pioneer Bond Fund | Annual Report | 6/30/15


Statement of Assets and Liabilities | 6/30/15



                                                                                     
ASSETS:
  Investment in securities (cost $3,043,245,224)                                        $3,052,717,217
  Cash                                                                                     122,141,983
  Futures Collateral                                                                         5,608,450
  Centrally cleared swap collateral                                                            500,000
  Receivables --
     Investment securities sold                                                              1,362,072
     Fund shares sold                                                                       32,597,934
     Dividends                                                                                 189,231
     Interest                                                                               19,317,034
     Due from Pioneer Investment Management, Inc.                                              298,645
     Variation margin for futures contracts                                                    133,025
  Credit default swaps, premiums paid                                                          316,361
  Variation margin for centrally cleared swap contracts                                         21,705
  Net unrealized appreciation on futures contracts                                           4,828,656
  Net unrealized appreciation on centrally cleared swap contracts                               34,098
  Other assets                                                                                  94,773
-------------------------------------------------------------------------------------------------------
                                                                                        $3,240,161,184
=======================================================================================================
LIABILITIES:
  Payables --
     Investment securities purchased                                                    $   70,709,403
     Fund shares repurchased                                                                 6,509,481
     Dividends                                                                               1,560,199
  Due to affiliates                                                                            674,217
  Accrued expenses                                                                             279,451
-------------------------------------------------------------------------------------------------------
                                                                                        $   79,732,751
=======================================================================================================
NET ASSETS:
  Paid-in capital                                                                       $3,146,745,747
  Distributions in excess of net investment income                                            (189,809)
  Accumulated net realized loss on investments, swap contracts
     and futures contracts                                                                    (462,252)
  Net unrealized appreciation on investments                                                 9,471,993
  Net unrealized appreciation on futures contracts                                           4,828,656
  Net unrealized appreciation on swap contracts                                                 34,098
-------------------------------------------------------------------------------------------------------
                                                                                        $3,160,428,433
=======================================================================================================
NET ASSET VALUE PER SHARE:
(No par value, unlimited number of shares authorized)
  Class A (based on $1,044,659,065/107,894,688 shares)                                  $         9.68
  Class C (based on $114,222,374/11,929,960 shares)                                     $         9.57
  Class K (based on $179,134,738/18,507,861 shares)                                     $         9.68
  Class R (based on $116,815,429/11,957,070 shares)                                     $         9.77
  Class Y (based on $1,644,160,972/171,413,890 shares)                                  $         9.59
  Class Z (based on $61,435,855/6,337,200 shares)                                       $         9.69
MAXIMUM OFFERING PRICE:
  Class A ($9.68 / 95.5%)                                                               $        10.14
=======================================================================================================


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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 67


Statement of Operations

For the Year Ended 6/30/15



                                                                                   
INVESTMENT INCOME:
  Interest                                                               $  84,177,416
  Dividends                                                                  2,997,180
-------------------------------------------------------------------------------------------------------
         Total investment income                                                         $  87,174,596
=======================================================================================================
EXPENSES:
  Management fees                                                        $   9,885,812
  Transfer agent fees
     Class A                                                                   279,967
     Class B*                                                                   11,204
     Class C                                                                    35,526
     Class K                                                                     1,767
     Class R                                                                    10,209
     Class Y                                                                    50,721
     Class Z                                                                     4,893
  Distribution fees
     Class A                                                                 2,277,564
     Class B*                                                                   18,499
     Class C                                                                   959,478
     Class R                                                                   393,957
  Shareholder communications expense                                         3,406,026
  Administrative reimbursements                                                693,950
  Custodian fees                                                               153,745
  Registration fees                                                            258,150
  Professional fees                                                            134,571
  Printing expense                                                              56,349
  Fees and expenses of nonaffiliated Trustees                                   90,772
  Miscellaneous                                                                257,475
-------------------------------------------------------------------------------------------------------
         Total expenses                                                                  $  18,980,635
         Less fees waived and expenses reimbursed
            by Pioneer Investment Management, Inc.                                            (799,315)
-------------------------------------------------------------------------------------------------------
         Net expenses                                                                    $  18,181,320
-------------------------------------------------------------------------------------------------------
            Net investment income                                                        $  68,993,276
-------------------------------------------------------------------------------------------------------
REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS,
FUTURES CONTRACTS AND SWAP CONTRACTS:
  Net realized gain (loss) on:
     Investments                                                         $  32,158,762
     Futures contracts                                                      (9,267,380)
     Swap contracts                                                            504,374   $  23,395,756
-------------------------------------------------------------------------------------------------------
  Change in net unrealized appreciation (depreciation) on:
     Investments                                                         $ (69,946,701)
     Futures contracts                                                       3,870,594
     Swap contracts                                                            134,072   $ (65,942,035)
-------------------------------------------------------------------------------------------------------
  Net loss on investments, futures contracts and swap contracts                          $ (42,546,279)
-------------------------------------------------------------------------------------------------------
  Net increase in net assets resulting from operations                                   $  26,446,997
=======================================================================================================


*    Class B shares converted to Class A shares on November 10, 2014.

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

68 Pioneer Bond Fund | Annual Report | 6/30/15


Statements of Changes in Net Assets



-------------------------------------------------------------------------------------------------------
                                                                       Year Ended       Year Ended
                                                                       6/30/15          6/30/14
-------------------------------------------------------------------------------------------------------
                                                                                  
FROM OPERATIONS:
Net investment income                                                  $   68,993,276   $   55,183,804
Net realized gain on investments, futures
  contracts and swap contracts                                             23,395,756       14,043,931
Change in net unrealized appreciation (depreciation)
  on investments, futures contracts and swap contracts                    (65,942,035)      23,696,606
-------------------------------------------------------------------------------------------------------
      Net increase in net assets resulting from operations             $   26,446,997   $   92,924,341
-------------------------------------------------------------------------------------------------------
DISTRIBUTIONS TO SHAREOWNERS:
Net investment income:
      Class A ($0.29 and $0.38 per share, respectively)                $  (26,434,196)  $  (22,667,902)
      Class B ($0.07 and $0.27 per share, respectively)*                      (34,683)        (193,002)
      Class C ($0.21 and $0.29 per share, respectively)                    (2,016,609)      (2,298,637)
      Class K ($0.32 and $0.40 per share, respectively)                    (2,711,408)         (38,942)
      Class R ($0.26 and $0.34 per share, respectively)                    (2,060,446)      (1,255,219)
      Class Y ($0.31 and $0.39 per share, respectively)                   (39,612,426)     (32,906,308)
      Class Z ($0.31 and $0.40 per share, respectively)                    (1,526,702)        (162,131)
Net realized gains
      Class A ($0.04 and $0.00 per share, respectively)                    (3,819,881)              --
      Class C ($0.04 and $0.00 per share, respectively)                      (406,576)              --
      Class K ($0.04 and $0.00 per share, respectively)                       (45,156)              --
      Class R ($0.04 and $0.00 per share, respectively)                      (285,304)              --
      Class Y ($0.04 and $0.00 per share, respectively)                    (4,943,141)              --
      Class Z ($0.04 and $0.00 per share, respectively)                      (218,854)              --
-------------------------------------------------------------------------------------------------------
      Total distributions to shareowners                               $  (84,115,382)  $  (59,522,141)
-------------------------------------------------------------------------------------------------------
FROM FUND SHARE TRANSACTIONS
Net proceeds from sale or exchange of shares                           $2,251,662,439   $  666,056,558
Reinvestment of distributions                                              65,229,520       47,974,430
Cost of shares repurchased                                               (813,633,836)    (647,980,831)
-------------------------------------------------------------------------------------------------------
      Net increase in net assets resulting from
         Fund share transactions                                       $1,503,258,123   $   66,050,157
-------------------------------------------------------------------------------------------------------
      Net increase in net assets                                       $1,445,589,738   $   99,452,357
NET ASSETS:
Beginning of year                                                      $1,714,838,695   $1,615,386,338
-------------------------------------------------------------------------------------------------------
End of year                                                            $3,160,428,433   $1,714,838,695
=======================================================================================================
Distributions in excess of net investment income                       $     (189,809)  $   (1,372,548)
=======================================================================================================


*    Class B shares converted to Class A shares on November 10, 2014.

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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 69


Statements of Changes in Net Assets (continued)



-------------------------------------------------------------------------------------------------------
                                           '15 Shares    '15 Amount        '14 Shares    '14 Amount
-------------------------------------------------------------------------------------------------------
                                                                             
Class A
Shares sold                                 73,397,739   $  722,362,397     33,575,403   $ 326,968,655
Reinvestment of distributions                2,437,923       23,964,170      2,135,282      20,747,926
Less shares repurchased                    (39,490,108)    (388,662,183)   (22,630,052)   (219,467,397)
-------------------------------------------------------------------------------------------------------
      Net increase                          36,345,554   $  357,664,384     13,080,633   $ 128,249,184
=======================================================================================================
Class B*
Shares exchanged                                12,531   $      122,811         17,772   $     171,327
Reinvestment of distributions                    2,761           27,063         16,903         162,846
Less shares repurchased                       (561,244)      (5,495,479)      (404,531)     (3,892,942)
-------------------------------------------------------------------------------------------------------
      Net decrease                            (545,952)  $   (5,345,605)      (369,856)  $  (3,558,769)
=======================================================================================================
Class C
Shares sold                                  6,453,693   $   62,788,125      1,238,186   $  11,902,291
Reinvestment of distributions                  159,439        1,549,668        176,433       1,692,531
Less shares repurchased                     (2,176,700)     (21,155,723)    (3,094,712)    (29,662,070)
-------------------------------------------------------------------------------------------------------
      Net increase (decrease)                4,436,432   $   43,182,070     (1,680,093)  $ (16,067,248)
=======================================================================================================
Class K
Shares sold                                 19,313,507   $  189,643,402        459,929   $   4,490,799
Reinvestment of distributions                  110,358        1,081,971          3,958          38,794
Less shares repurchased                     (1,361,429)     (13,348,774)       (19,469)       (191,302)
-------------------------------------------------------------------------------------------------------
      Net increase                          18,062,436   $  177,376,599        444,418   $   4,338,291
=======================================================================================================
Class R
Shares sold                                  8,339,063   $   82,666,234      2,689,792   $  26,402,096
Reinvestment of distributions                  217,675        2,158,016        119,608       1,172,422
Less shares repurchased                     (1,440,815)     (14,287,736)    (1,161,793)    (11,353,848)
-------------------------------------------------------------------------------------------------------
      Net increase                           7,115,923   $   70,536,514      1,647,607   $  16,220,670
=======================================================================================================
Class Y
Shares sold                                116,221,047   $1,131,771,954     30,497,633   $ 293,771,461
Reinvestment of distributions                3,565,174       34,708,672      2,494,174      24,002,560
Less shares repurchased                    (37,432,755)    (364,339,899)   (39,540,727)   (379,763,123)
-------------------------------------------------------------------------------------------------------
      Net increase (decrease)               82,353,466   $  802,140,727     (6,548,920)  $ (61,989,102)
=======================================================================================================
Class Z
Shares sold                                  6,317,443   $   62,307,516        241,257   $   2,349,929
Reinvestment of distributions                  176,815        1,739,960         16,156         157,351
Less shares repurchased                       (644,582)      (6,344,042)      (377,159)     (3,650,149)
-------------------------------------------------------------------------------------------------------
      Net increase (decrease)                5,849,676   $   57,703,434       (119,746)  $  (1,142,869)
=======================================================================================================


*    Class B shares converted to Class A shares on November 10, 2014.

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

70 Pioneer Bond Fund | Annual Report | 6/30/15


Financial Highlights



---------------------------------------------------------------------------------------------------------------------
                                                             Year         Year       Year       Year       Year
                                                             Ended        Ended      Ended      Ended      Ended
                                                             6/30/15      6/30/14    6/30/13    6/30/12    6/30/11
---------------------------------------------------------------------------------------------------------------------
                                                                                            
Class A
Net asset value, beginning of period                         $     9.88   $   9.67   $   9.73   $   9.66   $   9.44
---------------------------------------------------------------------------------------------------------------------
Increase (decrease) from investment operations:
   Net investment income (loss)                              $     0.27   $   0.35   $   0.38   $   0.42   $   0.45
   Net realized and unrealized gain (loss) on investments         (0.14)      0.24      (0.07)      0.13       0.21
---------------------------------------------------------------------------------------------------------------------
Net increase (decrease) from investment operations           $     0.13   $   0.59   $   0.31   $   0.55   $   0.66
---------------------------------------------------------------------------------------------------------------------
Distribution to shareowners:
   Net investment income                                     $    (0.29)  $  (0.38)  $  (0.37)  $  (0.43)  $  (0.44)
   Net realized gain                                              (0.04)        --         --      (0.05)        --
---------------------------------------------------------------------------------------------------------------------
Total distributions                                          $    (0.33)  $  (0.38)  $  (0.37)  $  (0.48)  $  (0.44)
---------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                   $    (0.20)  $   0.21   $  (0.06)  $   0.07   $   0.22
---------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                               $     9.68   $   9.88   $   9.67   $   9.73   $   9.66
=====================================================================================================================
Total return*                                                      1.32%      6.19%      3.21%      5.91%      7.08%
Ratio of net expenses to average net assets                        0.85%      0.85%      0.85%      0.85%      0.85%
Ratio of net investment income (loss) to average net assets        2.68%      3.52%      3.77%      4.35%      4.63%
Portfolio turnover rate                                              81%        41%        28%        21%        36%
Net assets, end of period (in thousands)                     $1,044,659   $706,962   $565,569   $453,772   $500,905
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                            0.93%      1.00%      1.01%      1.03%      1.06%
   Net investment income (loss) to average net assets              2.60%      3.37%      3.61%      4.17%      4.42%
=====================================================================================================================


*    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.

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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 71


Financial Highlights (continued)



---------------------------------------------------------------------------------------------------------------------
                                                                   Year       Year      Year      Year      Year
                                                                   Ended      Ended     Ended     Ended     Ended
                                                                   6/30/15    6/30/14   6/30/13   6/30/12   6/30/11
---------------------------------------------------------------------------------------------------------------------
                                                                                             
Class C
Net asset value, beginning of period                               $   9.77   $  9.57   $  9.63   $  9.55   $  9.34
---------------------------------------------------------------------------------------------------------------------
Increase (decrease) from investment operations:
   Net investment income (loss)                                    $   0.19   $  0.26   $  0.29   $  0.33   $  0.36
   Net realized and unrealized gain (loss) on investments             (0.14)     0.23     (0.06)     0.15      0.20
---------------------------------------------------------------------------------------------------------------------
Net increase (decrease) from investment operations                 $   0.05   $  0.49   $  0.23   $  0.48   $  0.56
---------------------------------------------------------------------------------------------------------------------
Distribution to shareowners:
   Net investment income                                           $  (0.21)  $ (0.29)  $ (0.29)  $ (0.35)  $ (0.35)
   Net realized gain                                                  (0.04)       --        --     (0.05)       --
---------------------------------------------------------------------------------------------------------------------
Total distributions                                                $  (0.25)  $ (0.29)  $ (0.29)  $ (0.40)  $ (0.35)
---------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                         $  (0.20)  $  0.20   $ (0.06)  $  0.08   $  0.21
---------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                     $   9.57   $  9.77   $  9.57   $  9.63   $  9.55
=====================================================================================================================
Total return*                                                          0.49%     5.20%     2.33%     5.12%     6.06%
Ratio of net expenses to average net assets                            1.63%     1.73%     1.72%     1.73%     1.73%
Ratio of net investment income (loss) to average net assets            1.89%     2.69%     2.93%     3.47%     3.75%
Portfolio turnover rate                                                  81%       41%       28%       21%       36%
Net assets, end of period (in thousands)                           $114,222   $73,224   $87,763   $93,737   $82,915
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                                1.63%     1.73%     1.72%     1.73%     1.73%
   Net investment income (loss) to average net assets                  1.89%     2.69%     2.93%     3.47%     3.75%
=====================================================================================================================


*    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.

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

72 Pioneer Bond Fund | Annual Report | 6/30/15





---------------------------------------------------------------------------------------------------------------------
                                                                                                         12/20/12
                                                                                Year Ended   Year Ended  to
                                                                                6/30/15      6/30/14     6/30/13
---------------------------------------------------------------------------------------------------------------------
                                                                                                
Class K
Net asset value, beginning of period                                            $   9.87     $  9.67     $  9.94
---------------------------------------------------------------------------------------------------------------------
Increase (decrease) from investment operations:
  Net investment income (loss)                                                  $   0.30     $  0.40     $  0.20
  Net realized and unrealized gain (loss)
     on investments                                                                (0.13)       0.20       (0.26)
---------------------------------------------------------------------------------------------------------------------
Net increase (decrease) from investment
  operations                                                                    $   0.17     $  0.60     $ (0.06)
---------------------------------------------------------------------------------------------------------------------
Distribution to shareowners:
  Net investment income                                                         $  (0.32)    $ (0.40)    $ (0.21)
  Net realized gain                                                                (0.04)         --          --
---------------------------------------------------------------------------------------------------------------------
Total distributions                                                             $  (0.36)    $ (0.40)    $ (0.21)
---------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                                      $  (0.19)    $  0.20     $ (0.27)
---------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                                  $   9.68     $  9.87     $  9.67
=====================================================================================================================
Total return*                                                                       1.80%       6.37%      (0.61)%(a)
Ratio of net expenses to average net assets                                         0.47%       0.56%       0.57%**
Ratio of net investment income (loss) to
  average net assets                                                                3.03%       3.59%       3.86%**
Portfolio turnover rate                                                               81%         41%         28%
Net assets, end of period (in thousands)                                        $179,135     $ 4,398     $    10
Ratios with no waiver of fees and assumption
  of expenses by the Adviser and no reduction
  for fees paid indirectly:
  Total expenses                                                                    0.47%       0.56%       0.57%**
  Net investment income (loss)                                                      3.03%       3.59%       3.86%**
=====================================================================================================================


*    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.

**   Annualized.

(a)  Not Annualized.

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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 73


Financial Highlights (continued)



---------------------------------------------------------------------------------------------------------------------
                                                                   Year       Year      Year      Year      Year
                                                                   Ended      Ended     Ended     Ended     Ended
                                                                   6/30/15    6/30/14   6/30/13   6/30/12   6/30/11
---------------------------------------------------------------------------------------------------------------------
                                                                                             
Class R
Net asset value, beginning of period                               $   9.97   $  9.76   $  9.82   $  9.74   $  9.52
---------------------------------------------------------------------------------------------------------------------
Increase (decrease) from investment operations:
   Net investment income (loss)                                    $   0.25   $  0.32   $  0.34   $  0.39   $  0.41
   Net realized and unrealized gain (loss) on investments             (0.15)     0.23     (0.06)     0.14      0.22
---------------------------------------------------------------------------------------------------------------------
Net increase (decrease) from investment operations                 $   0.10   $  0.55   $  0.28   $  0.53   $  0.63
---------------------------------------------------------------------------------------------------------------------
Distribution to shareowners:
   Net investment income                                           $  (0.26)  $ (0.34)  $ (0.34)  $ (0.40)  $ (0.41)
   Net realized gain                                                  (0.04)       --        --     (0.05)       --
---------------------------------------------------------------------------------------------------------------------
Total distributions                                                $  (0.30)  $ (0.34)  $ (0.34)  $ (0.45)  $ (0.41)
---------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                         $  (0.20)  $  0.21   $ (0.06)  $  0.08   $  0.22
---------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                     $   9.77   $  9.97   $  9.76   $  9.82   $  9.74
=====================================================================================================================
Total return*                                                          1.06%     5.75%     2.80%     5.58%     6.67%
Ratio of net expenses to average net assets                            1.10%     1.25%     1.25%     1.25%     1.24%
Ratio of net investment income (loss) to average net assets            2.43%     3.12%     3.36%     3.94%     4.25%
Portfolio turnover rate                                                  81%       41%       28%       21%       36%
Net assets, end of period (in thousands)                           $116,815   $48,264   $31,169   $23,892   $20,508
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                                1.21%     1.32%     1.35%     1.35%     1.24%
   Net investment income (loss) to average net assets                  2.32%     3.05%     3.26%     3.84%     4.25%
=====================================================================================================================


*    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.

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

74 Pioneer Bond Fund | Annual Report | 6/30/15




---------------------------------------------------------------------------------------------------------------------
                                                             Year         Year       Year       Year       Year
                                                             Ended        Ended      Ended      Ended      Ended
                                                             6/30/15      6/30/14    6/30/13    6/30/12    6/30/11
---------------------------------------------------------------------------------------------------------------------
                                                                                            
Class Y
Net asset value, beginning of period                         $     9.79   $   9.58   $   9.65   $   9.57   $   9.36
---------------------------------------------------------------------------------------------------------------------
Increase (decrease) from investment operations:
   Net investment income (loss)                              $     0.30   $   0.36   $   0.39   $   0.44   $   0.47
   Net realized and unrealized gain (loss) on investments         (0.15)      0.24      (0.07)      0.14       0.20
---------------------------------------------------------------------------------------------------------------------
Net increase (decrease) from investment operations           $     0.15   $   0.60   $   0.32   $   0.58   $   0.67
---------------------------------------------------------------------------------------------------------------------
Distribution to shareowners:
   Net investment income                                     $    (0.31)  $  (0.39)  $  (0.39)  $  (0.45)  $  (0.46)
   Net realized gain                                              (0.04)        --         --      (0.05)        --
---------------------------------------------------------------------------------------------------------------------
Total distributions                                          $    (0.35)  $  (0.39)  $  (0.39)  $  (0.50)  $  (0.46)
---------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                   $    (0.20)  $   0.21   $  (0.07)  $   0.08   $   0.21
---------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                               $     9.59   $   9.79   $   9.58   $   9.65   $   9.57
=====================================================================================================================
Total return*                                                      1.59%      6.41%      3.34%      6.27%      7.25%
Ratio of net expenses to average net assets                        0.58%      0.66%      0.66%      0.65%      0.61%
Ratio of net investment income (loss) to average net assets        2.95%      3.72%      3.97%      4.55%      4.88%
Portfolio turnover rate                                              81%        41%        28%        21%        36%
Net assets, end of period (in thousands)                     $1,644,161   $871,801   $916,182   $847,072   $717,433
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                            0.58%      0.66%      0.66%      0.65%      0.61%
   Net investment income (loss) to average net assets              2.95%      3.72%      3.97%      4.55%      4.88%
=====================================================================================================================


*    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.

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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 75


Financial Highlights (continued)



---------------------------------------------------------------------------------------------------------------------
                                                                    Year      Year      Year      Year      Year
                                                                    Ended     Ended     Ended     Ended     Ended
                                                                    6/30/15   6/30/14   6/30/13   6/30/12   6/30/11
---------------------------------------------------------------------------------------------------------------------
                                                                                             
Class Z
Net asset value, beginning of period                                $  9.90   $  9.70   $  9.76   $  9.68   $  9.46
---------------------------------------------------------------------------------------------------------------------
Increase (decrease) from investment operations:
   Net investment income (loss)                                     $  0.28   $  0.38   $  0.40   $  0.45   $  0.47
   Net realized and unrealized gain (loss) on investments             (0.14)     0.22     (0.06)     0.14      0.21
---------------------------------------------------------------------------------------------------------------------
Net increase (decrease) from investment operations                  $  0.14   $  0.60   $  0.34   $  0.59   $  0.68
---------------------------------------------------------------------------------------------------------------------
Distribution to shareowners:
   Net investment income                                            $ (0.31)  $ (0.40)  $ (0.40)  $ (0.46)  $ (0.46)
   Net realized gain                                                  (0.04)       --        --     (0.05)       --
---------------------------------------------------------------------------------------------------------------------
Total distributions                                                 $ (0.35)  $ (0.40)  $ (0.40)  $ (0.51)  $ (0.46)
---------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                          $ (0.21)  $  0.20   $ (0.06)  $  0.08   $  0.22
---------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                      $  9.69   $  9.90   $  9.70   $  9.76   $  9.68
=====================================================================================================================
Total return*                                                          1.47%     6.29%     3.41%     6.23%     7.30%
Ratio of net expenses to average net assets                            0.65%     0.65%     0.65%     0.65%     0.65%
Ratio of net investment income (loss) to average net assets            2.89%     3.70%     3.95%     4.50%     4.82%
Portfolio turnover rate                                                  81%       41%       28%       21%       36%
Net assets, end of period (in thousands)                            $61,436   $ 4,828   $ 5,889   $ 2,196   $   787
Ratios with no waiver of fees and assumption of expenses by
   the Adviser and no reduction for fees paid indirectly:
   Total expenses                                                      0.65%     0.82%     0.87%     0.83%     0.72%
   Net investment income (loss)                                        2.89%     3.53%     3.73%     4.32%     4.75%
=====================================================================================================================


*    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.

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

76 Pioneer Bond Fund | Annual Report | 6/30/15


Notes to Financial Statements | 6/30/15

1. Organization and Significant Accounting Policies

Pioneer Bond Fund (the Fund) is a Delaware statutory trust. The Fund is
registered under the Investment Company Act of 1940 as a diversified, open-end
management investment company. The investment objective of the Fund is to seek
current income consistent with preservation of capital.

The Fund offers six classes of shares designated as Class A, Class C, Class K,
Class R, Class Y and Class Z shares. Class K shares commenced operations on
December 20, 2012. The Fund ceased to offer Class B shares on November 10, 2014.
Class B shares were converted to Class A shares as of the close of business on
November 10, 2014. 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 the flexibility to
specify either per-share voting or dollar-weighted voting when submitting
matters for shareholder approval. Under per-share voting, each share of a class
of the Fund is entitled to one vote. Under dollar-weighted voting, a
shareholder's voting power is determined not by the number of shares owned, but
by the dollar value of the shares on the record date. Each share class has
exclusive voting rights with respect to matters affecting only that class,
including with respect to the distribution plan for that class. There is no
distribution plan for Class K, Class Y or Class Z shares.

The Fund's financial statements have been prepared in conformity with U.S.
generally accepted accounting principles that require the management of the Fund
to, among other things, make estimates and assumptions that affect the reported
amounts of assets and liabilities, the disclosure of contingent assets and
liabilities at the date of the financial statements, and the reported amounts of
income, expenses and gains and losses 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, which are consistent with
those policies generally accepted in the investment company industry:

                                  Pioneer Bond Fund | Annual Report | 6/30/15 77


A.   Security Valuation

     Security transactions are recorded as of trade date. 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. Fixed
     income securities are valued at 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. Valuations may be supplemented by dealers and other sources,
     as required. Senior floating rate loan interests (senior loans) are valued
     in accordance with guidelines established by the Board of Trustees at the
     mean between the last available bid and asked prices from one or more
     brokers or dealers as obtained from Loan Pricing Corporation, an
     independent pricing service. If price information is not available from
     Loan Pricing Corporation, or if the price information is deemed to be
     unreliable, price information will be obtained from an alternative loan
     interest pricing service. If no reliable price quotes are available from
     either the primary or alternative pricing service, broker quotes will be
     solicited. Event-linked bonds are valued at the bid price obtained from an
     independent third party pricing service. Other insurance-linked securities
     may be valued at the bid price obtained from an independent pricing
     service, or through a third party using a pricing matrix, insurance
     industry valuation models, or other fair value methods or techniques to
     provide an estimated value of the instrument. Credit default swaps are
     valued by an independent pricing service based upon valuation models
     incorporating default probabilities, estimated recovery rates, actual
     reported transactions, and other available market data. Equity securities
     that have traded on an exchange are valued at 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. Shares of money market mutual funds are valued at such funds'
     net asset value. Cash may include overnight time deposits at approved
     financial institutions.

     Securities for which independent pricing services are unable to supply
     prices or for which market prices and/or quotations are not readily
     available or are considered to be unreliable are valued by a fair valuation
     team comprised of certain personnel of Pioneer Investment Management, Inc.
     (PIM), the Fund's investment adviser, pursuant to procedures adopted by the
     Fund's Board of Trustees. PIM's fair valuation team uses fair value methods
     approved by the Valuation Committee of the Board of Trustees. PIM's fair
     valuation team is responsible for monitoring developments that may impact
     fair valued securities and for discussing and assessing fair values on an
     ongoing basis, and at least quarterly, with the Valuation Committee of the
     Board of Trustees.

79 Pioneer Bond Fund | Annual Report | 6/30/15


     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 June 30, 2015, one security was valued using fair value methods (in
     addition to securities valued using prices supplied by independent pricing
     services, broker-dealers or using a third party insurance industry pricing
     model) amounting to 0.03% of net assets.

B.   Investment Income and Transactions

     Principal amounts of mortgage-backed securities, asset-backed securities
     and corporate bonds are adjusted for monthly paydowns. Premiums and
     discounts related to certain mortgage-backed securities are amortized or
     accreted in proportion to the monthly paydowns. All discounts/premiums on
     purchase prices of debt securities are accreted/amortized for financial
     reporting purposes over the life of the respective securities, and such
     accretion/amortization is included in interest income.

     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.

     Gains and losses on sales of investments are calculated on the identified
     cost method for both financial reporting and federal income tax purposes.

C.   Federal Income Taxes

     It is the Fund's policy to comply with the requirements of the Internal
     Revenue Code applicable to regulated investment companies and to distribute
     all of its taxable income and net realized capital gains, if any, to its
     shareowners. Therefore, no provision for federal income taxes is required.
     As of June 30, 2015, the Fund did not accrue any interest or penalties with
     respect to uncertain tax positions, which, if applicable, would be recorded
     as

                                  Pioneer Bond Fund | Annual Report | 6/30/15 79


     an income tax expense in the Statement of Operations. Tax returns filed
     within the prior three years remain subject to examination by Federal and
     State tax authorities.

     Distributions in excess of net investment income or net realized gains are
     temporary overdistributions for financial statement purposes resulting from
     differences in the recognition or classification of income or distributions
     for financial statement and tax purposes. Capital accounts within the
     financial statements are adjusted for permanent book/tax differences to
     reflect tax character, but are not adjusted for temporary differences. At
     June 30, 2015, the Fund reclassified $6,585,933 to decrease distributions
     in excess of net investment income and $6,585,933 to decrease accumulated
     net realized loss on investments, swap contracts and futures contracts to
     reflect permanent book/tax differences. These adjustments have no impact on
     net assets or the results of operations.

     At June 30, 2015, a capital loss carryforward of $4,795,956 was utilized to
     offset gains incurred by the Fund.

     The tax character of distributions paid during the years ended June 30,
     2015 and June 30, 2014 were as follows:



     ---------------------------------------------------------------------------
                                                     2015                   2014
     ---------------------------------------------------------------------------
                                                               
     Distributions paid from:
     Ordinary income                          $74,396,470            $59,522,141
     Long-term capital gain                     9,718,912                     --
     ---------------------------------------------------------------------------
          Total                               $84,115,382            $59,522,141
     ===========================================================================


     The following shows the components of distributable earnings on a federal
     income tax basis at June 30, 2015:



     ---------------------------------------------------------------------------
                                                                            2015
     ---------------------------------------------------------------------------
                                                                  
     Distributable earnings:
     Undistributed ordinary income                                   $ 3,028,838
     Undistributed long-term capital gain                              7,303,607
     Dividends payable                                                (1,560,199)
     Net unrealized appreciation                                       4,910,440
     ---------------------------------------------------------------------------
          Total                                                      $13,682,686
     ===========================================================================


     The difference between book-basis and tax-basis net unrealized appreciation
     is attributable to the tax deferral of losses on wash sales, adjustments
     relating to catastrophe bonds, the tax treatment of premium and
     amortization, the mark-to-market of futures contracts and credit default
     swaps.

80 Pioneer Bond Fund | Annual Report | 6/30/15


D.   Fund Shares

     The Fund records sales and repurchases of its shares as of trade date.
     Pioneer Funds Distributor, Inc. (PFD), the principal underwriter for the
     Fund and a wholly owned indirect subsidiary of UniCredit S.p.A.
     (UniCredit), earned $71,839 in underwriting commissions on the sale of
     Class A shares during the year ended June 30, 2015.

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 K, Class Y and Class Z shares do not pay
     distribution fees. All expenses and fees paid to the transfer agent,
     Pioneer Investment Management Shareholder Services, Inc. (PIMSS), 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).

     The Fund declares as daily dividends substantially all of its net
     investment income. All dividends are paid on a monthly basis. Short-term
     capital gain distributions, if any, may be declared with the daily
     dividends. Distributions to shareowners are recorded as of the ex-dividend
     date. Distributions paid by the Fund with respect to each class of shares
     are calculated in the same manner and at the same time, except that net
     investment income dividends to Class A, Class C, Class K, Class R, Class Y
     and Class Z shares can reflect different transfer agent and distribution
     expense rates.

F.   Risks

     At times, the Fund's investments may represent industries or industry
     sectors that are interrelated or have common risks, making the Fund more
     susceptible to any economic, political, or regulatory developments or other
     risks affecting those industries and sectors. The Fund's prospectus
     contains unaudited information regarding the Fund's principal risks. Please
     refer to that document when considering the Fund's principal risks.

     The Fund invests in event-linked bonds. Event-linked bonds are floating
     rate debt obligations for which the return of principal and the payment of
     interest are contingent on the non-occurrence of a pre-defined "trigger"
     event, such as a hurricane or an earthquake of a specific magnitude. The
     trigger event's magnitude may be based on losses to a company or industry,
     industry indexes or readings of scientific instruments, or may be based on
     specified actual losses. If a trigger event, as defined within the terms of
     an event-linked bond occurs, the Fund may lose a portion or all of its
     accrued interest and/or

                                  Pioneer Bond Fund | Annual Report | 6/30/15 81


     principal invested in such event-linked bond. The Fund is entitled to
     receive principal and interest payments so long as no trigger event occurs
     of the description and magnitude specified by the instrument. In addition
     to the specified trigger events, event-linked bonds may expose the Fund to
     other risks, including but not limited to issuer (credit) default, adverse
     regulatory or jurisdictional interpretations and adverse tax consequences.

     In addition to event-linked bonds, the Fund also may invest in other
     insurance-linked securities ("ILS"). The Fund's investments in ILS may
     include special purpose vehicles ("SPVs") or similar instruments structured
     to comprise a portion of a reinsurer's catastrophe-oriented business, known
     as quota share instruments (sometimes referred to as reinsurance sidecars),
     or to provide reinsurance relating to specific risks to insurance or
     reinsurance companies through a collateralized instrument, known as
     collateralized reinsurance. Structured reinsurance investments also may
     include industry loss warranties ("ILWs"), are subject to the same risks as
     event-linked bonds. In addition, because quota share instruments represent
     an interest in a basket of underlying reinsurance contracts, the Fund has
     limited transparency into the individual underlying contracts and therefore
     must rely upon the risk assessment and sound underwriting practices of the
     issuer. Accordingly, it may be more difficult for PIM to fully evaluate the
     underlying risk profile of the Fund's investment in quota share instruments
     and therefore place the Fund's assets at greater risk of loss than if PIM
     had more complete information. These securities may be difficult to
     purchase, sell or unwind and may be difficult to value.

G.   Futures Contracts

     The Fund may enter into futures transactions in order to attempt to hedge
     against changes in interest rates, securities prices and currency exchange
     rates or to seek to increase total return. Futures contracts are types of
     derivatives. All futures contracts entered into by the Fund are traded on a
     futures exchange. Upon entering into a futures contract, the Fund is
     required to deposit with a broker an amount of cash or securities equal to
     the minimum "initial margin" requirements of the associated futures
     exchange. The amount of cash deposited with the broker as collateral at
     June 30, 2015 was $5,608,450. Subsequent payments for futures contracts
     ("variation margin") are paid or received by the Fund, depending on the
     daily fluctuation in the value of the contracts, and are recorded by the
     Fund as unrealized appreciation or depreciation. When the contract is
     closed, the Fund realizes a gain or loss equal to the difference between
     the opening and closing value of the contract as well as any fluctuation in
     foreign currency exchange rates where applicable. The use of futures
     contracts are subject to market risk, interest rate risk and currency
     exchange rate risk. Changes in value of the

82 Pioneer Bond Fund | Annual Report | 6/30/15


     contracts may not directly correlate to the changes in value of the
     underlying securities. The average value of contracts open during the year
     ended June 30, 2015 was $426,354,761.

     At June 30, 2015, open futures contracts were as follows:



--------------------------------------------------------------------------------
                        Number of                                 Unrealized
                        Contracts    Settlement                   Appreciation
Type                    Long/(Short) Month       Value            (Depreciation)
--------------------------------------------------------------------------------
                                                      
U.S. Long Bond (CBT)      (575)      9/15        $  (86,735,156)  $1,889,531
U.S. Ultra Bond (CBT)      492       9/15            75,798,750     (104,043)
U.S. 10 Year Note (CBT) (3,573)      9/15          (450,812,109)   3,145,000
U.S. 2 Year Note (CBT)    (331)      9/15           (72,468,313)     (98,096)
U.S. 5 Year Note (CBT)     (17)      9/15            (2,027,383)      (3,736)
--------------------------------------------------------------------------------
                                                 $ (536,244,211)  $4,828,656
--------------------------------------------------------------------------------


H.   Repurchase Agreements

     With respect to repurchase agreements entered into by the Fund, the value
     of the underlying securities (collateral), including accrued interest, is
     required to be equal to or in excess of the repurchase price. The
     collateral for all repurchase agreements is held in safekeeping in the
     customer-only account of the Fund's custodian or a subcustodian of the
     Fund. PIM is responsible for determining that the value of the collateral
     remains at least equal to the repurchase price.

I.   Credit Default Swap Agreements

     A credit default swap is a contract between a buyer of protection and a
     seller of protection against a pre-defined credit event. The Fund may buy
     or sell credit default swap contracts to seek to increase the Fund's
     income, or to attempt to hedge the risk of default on portfolio securities.
     A credit default swap index is used to hedge risk or take a position on a
     basket of credit entities or indices. As a seller of protection, the Fund
     would be required to pay the notional (or other agreed-upon) value of the
     referenced debt obligation to the counterparty in the event of a default by
     a U.S. or foreign corporate issuer of a debt obligation, which would likely
     result in a loss to the Fund. In return, the Fund would receive from the
     counterparty a periodic stream of payments during the term of the contract
     provided that no event of default occurred. The maximum exposure of loss to
     the seller would be the notional value of the credit default swaps
     outstanding. If no default occurs, the Fund would keep the stream of
     payments and would have no payment obligation. The Fund may also buy credit
     default swap contracts in order to hedge against the risk of default of
     debt securities, in which case the Fund would function as the counterparty
     referenced above.

     When the Fund enters into a credit default swap contract, the protection
     buyer makes an upfront or periodic payment to the protection seller in
     exchange for the right to receive a contingent payment. An upfront payment

                                  Pioneer Bond Fund | Annual Report | 6/30/15 83


     made by the Fund, as the protection buyer, is recorded as an asset in the
     Statement of Assets and Liabilities. Periodic payments received or paid by
     the Fund are recorded as realized gains or losses in the Statement of
     Operations.

     Credit default swap contracts are marked-to-market daily using valuations
     supplied by independent sources and the change in value, if any, is
     recorded as unrealized appreciation or depreciation in the Statement of
     Assets and Liabilities. Payments received or made as a result of a credit
     event or upon termination of the contract are recognized, net of the
     appropriate amount of the upfront payment, as realized gains or losses in
     the Statement of Operations.

     Credit default swap contracts involving the sale of protection may involve
     greater risks than if the Fund had invested in the referenced debt
     instrument directly. Credit default swap contracts are subject to general
     market risk, liquidity risk, counterparty risk and credit risk. If the Fund
     is a protection buyer and no credit event occurs, it will lose its
     investment. If the Fund is a protection seller and a credit event occurs,
     the value of the referenced debt instrument received by the Fund, together
     with the periodic payments received, may be less than the amount the Fund
     pays to the protection buyer, resulting in a loss to the Fund.

     Certain swap contracts that are cleared through a central clearinghouse are
     referred to as centrally cleared swaps. All payments made or received by
     the Fund are pursuant to a centrally cleared swap contract with the central
     clearing party rather than the original counterparty. Upon entering into a
     centrally cleared swap contract, the Fund is required to make an initial
     margin deposit, either in cash or in securities. The daily change in value
     on open centrally cleared contracts is recorded as variation margin on
     centrally cleared swaps on the Statement of Assets and Liabilities.

     Open credit default swap contracts at June 30, 2015 are listed in the
     Schedule of Investments. The average value of swap contracts open during
     the year ended June 30, 2015 was $407,297.

2. Management Agreement

PIM, a wholly owned indirect subsidiary of UniCredit, manages the Fund's
portfolio. Management fees are calculated daily at the annual rate of 0.40% of
the Fund's average daily net assets. Prior to July 1, 2014, the annual fee paid
by the fund was 0.50% of the fund's average daily net assets up to $1 billion,
0.45% of the fund's average daily net assets between $1 billion and $2 billion,
and 0.40% of the fund's average daily net assets over $2 billion. For the year
ended June 30, 2015, the effective management fee (excluding waivers and/or
assumption of expenses) was equal to 0.40% of the Fund's average daily net
assets.

84 Pioneer Bond Fund | Annual Report | 6/30/15


PIM has contractually agreed to limit ordinary operating expenses to the extent
required to reduce Fund expenses to 0.85%, 1.90%, 1.10%, 0.58% and 0.65% of the
average daily net assets attributable to Class A, Class C, Class R, Class Y and
Class Z shares, respectively. Fees waived and expenses reimbursed during the
year ended June 30, 2015 are reflected on the Statement of Operations. These
expense limitations are in effect through November 1, 2016 for Class A, Class R,
Class Y and Class Z shares and November 1, 2015 for Class C shares. There can be
no assurance that PIM will extend the expense limitation agreement for a class
of shares beyond the dates referred to above.

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
$145,099 in management fees, administrative costs and certain other
reimbursements payable to PIM at June 30, 2015.

3. Transfer Agent

PIMSS, a wholly owned indirect subsidiary of UniCredit, provides substantially
all transfer agent and shareowner services to the Fund at negotiated rates.

In addition, the Fund reimburses PIMSS for out-of-pocket expenses incurred by
PIMSS related to shareholder communications activities such as proxy and
statement mailings, outgoing phone calls and omnibus relationship contracts. For
the year ended June 30, 2015, such out-of-pocket expenses by class of shares
were as follows:



--------------------------------------------------------------------------------
Shareholder Communications:
--------------------------------------------------------------------------------
                                                                   
Class A                                                               $1,652,247
Class B                                                                    3,967
Class C                                                                  122,320
Class K                                                                      596
Class R                                                                  181,101
Class Y                                                                1,361,096
Class Z                                                                   84,699
--------------------------------------------------------------------------------
    Total                                                             $3,406,026
================================================================================


Included in "Due to affiliates" reflected on the Statement of Assets and
Liabilities is $481,586 in transfer agent fees and out-of-pocket reimbursements
payable to PIMSS at June 30, 2015.

4. Distribution and Service Plans

The Fund has adopted a Distribution Plan pursuant to Rule 12b-1 of the
Investment Company Act of 1940 with respect to its Class A, Class C and Class R
shares. Pursuant to the Plan, the Fund pays PFD 0.25% of the average daily net

                                  Pioneer Bond Fund | Annual Report | 6/30/15 85


assets attributable to Class A shares as compensation for personal services
and/or account maintenance services or distribution services with regard to
Class A shares. Pursuant to the Plan, the Fund also pays PFD 1.00% of the
average daily net assets attributable to Class C shares. The fee for Class C
shares consists of a 0.25% service fee and a 0.75% distribution fee paid as
compensation for personal services and/or account maintenance services or
distribution services with regard to Class C shares. Pursuant to the Plan, the
Fund further pays PFD 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 $47,532 in distribution
fees payable to PFD at June 30, 2015.

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

In addition, redemptions of each class of shares (except Class K, Class R, Class
Y and Class Z 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, Class Y or Class Z shares.
Proceeds from the CDSC are paid to PFD. For the year ended June 30, 2015, CDSC
in the amount of $17,558 were paid to PFD.

5. Expense Offset Arrangements

The Fund has entered into certain expense offset arrangements with PIMSS which
may result in a reduction in the Fund's total expenses due to interest earned on
cash held by PIMSS. For the year ended June 30, 2015, the Fund's expenses were
not reduced under such arrangements.

6. Line of Credit Facility

The Fund, along with certain other funds in the Pioneer Family of Funds (the
Funds), participates in a committed, unsecured revolving line of credit
facility. Borrowings are used solely for temporary or emergency purposes. The
Fund may borrow up to the lesser of the amount available under the facility or
the limits set for borrowing by the Fund's prospectus and the 1940 Act. The
credit facility in effect until June 9, 2015 was in the amount of $215 million.
As of June 9, 2015, the facility is in the amount of $240 million. Under such
facility, depending on the type of loan, interest on borrowings is payable at
the London

86 Pioneer Bond Fund | Annual Report | 6/30/15


Interbank Offered Rate (LIBOR) plus 0.85% (0.90% prior to February 12, 2014) on
an annualized basis, or the Alternate Base Rate, which is the greater of (a) the
facility's administrative agent's daily announced prime rate on the borrowing
date, (b) 2% plus the Federal Funds Rate on the borrowing date and (c) 2% plus
the overnight Eurodollar rate on the borrowing date. The Funds pay an annual
commitment fee to participate in a credit facility. The commitment fee is
allocated among participating Funds based on an allocation schedule set forth in
the credit agreement. For the year ended June 30, 2015, the Fund had no
borrowings under a credit facility.

7. Additional Disclosures about Derivative Instruments and Hedging Activities:

Values of derivative instruments as of June 30, 2015, were as follows:



-------------------------------------------------------------------------------------------
Derivatives Not
Accounted for as           Asset Derivatives 2015             Liabilities Derivatives 2015
Hedging Instruments        ------------------------------    ------------------------------
Under Accounting           Statement of Assets                Statement of Assets
Standards Codification     and Liabilities                    and Liabilities
(ASC) 815                  Location           Value           Location               Value
-------------------------------------------------------------------------------------------
                                                                         
Futures contracts          Net unrealized                     Net unrealized
                           appreciation on                    depreciation on
                           futures contracts  $4,828,656      futures contracts      $  --
Swap Contracts             Net unrealized                     Net unrealized
                           appreciation on                    depreciation on
                           swap contracts     $   34,098      swap contracts         $  --
-------------------------------------------------------------------------------------------
 Total                                        $4,862,754                             $  --
===========================================================================================


The effect of derivative instruments on the Statement of Operations for the year
ended June 30, 2015 was as follows:



-------------------------------------------------------------------------------------------
                                                              Change in
Derivatives Not                                               Realized      Unrealized
Accounted for as                                              Gain or       Appreciation or
Hedging Instruments                                           Loss on       (Depreciation)
Under Accounting         Location of Gain or (Loss)           Derivatives   on Derivatives
Standards Codification   on Derivatives Recognized            Recognized    Recognized
(ASC) 815                in Income                            in Income     in Income
-------------------------------------------------------------------------------------------
                                                                   
Futures contracts        Net realized gain (loss) on
                         futures contracts                    $(9,267,380)
Futures contracts        Change in unrealized appreciation
                         (depreciation) on futures contracts                $3,870,594
Swap Contracts           Net realized gain (loss) on
                         swap contracts                       $   504,374
Swap Contracts           Change in unrealized appreciation
                         (depreciation) on swap contracts                   $ 134,072


                                  Pioneer Bond Fund | Annual Report | 6/30/15 87


8. Bridge Loan Commitments

As of June 30, 2015, the Portfolio had one bridge loan commitment of $3,685,000,
which could be extended at the option of the borrower, pursuant to the following
loan agreement:



-------------------------------------------------------------------------------------------
                                                                               Unrealized
Loan                              Principal       Cost           Value         Appreciation
-------------------------------------------------------------------------------------------
                                                                   
Charter Communications
 Operating Co., Bridge Loan       3,685,000       $3,685,000     $3,685,000    $--
-------------------------------------------------------------------------------------------
 Total                                                                         $--
===========================================================================================


9. Conversion of Class Z Shares

As of the close of business on August 7, 2015 (the "Conversion Date"), all
outstanding Class Z shares of the Fund were converted to Class Y shares.

Additional Information

PIM, the Fund's investment adviser, is currently an indirect, wholly-owned
subsidiary of UniCredit. On April 23, 2015, UniCredit announced that it signed a
preliminary and exclusive agreement with Banco Santander and affiliates of
Warburg Pincus and General Atlantic (the "Private Equity Firms") with respect to
Pioneer Investments ("Pioneer") and Santander Asset Management ("SAM") (the
"Transaction").

The Transaction, as described in the UniCredit announcement, will entail the
establishment of a holding company, with the name Pioneer Investments, to be
owned by UniCredit (50%) and the Private Equity Firms (50% between them). The
holding company will control Pioneer's U.S. operations, including the Adviser.
The holding company also will own 66.7% of Pioneer's and SAM's combined
operations outside the U.S., while Banco Santander will own directly the
remaining 33.3% stake. The completion of the Transaction is subject to the
signing of a definitive agreement, as well as certain regulatory and corporate
approvals, and other conditions.

Under the Investment Company Act of 1940, completion of the Transaction will
cause the Fund's investment advisory agreement with the Adviser to terminate. In
connection with the Transaction, the Fund's Board of Trustees will be asked to
approve a new investment advisory agreement for the Fund. If approved by the
Board, the Fund's new investment advisory agreement will be submitted to the
shareholders of the Fund for their approval.

88 Pioneer Bond Fund | Annual Report | 6/30/15


Report of Independent Registered Public Accounting Firm

To the Board of Trustees and the Shareowners of
Pioneer Bond Fund:
--------------------------------------------------------------------------------
We have audited the accompanying statement of assets and liabilities of Pioneer
Bond Fund (the "Fund"), including the schedule of investments, as of June 30,
2015, and the related statements of operations for year then ended, and the
statement of changes in net assets and the financial highlights for each of the
two years in the period then ended. These financial statements and financial
highlights are the responsibility of the Fund's management. Our responsibility
is to express an opinion on these financial statements and financial highlights
based on our audits. The financial highlights for the years ended June 30, 2013,
2012, and 2011 were audited by other auditors. Those auditors expressed an
unqualified opinion on those financial statements and financial highlights in
their report dated August 22, 2013.

We conducted our audits in accordance with the standards of the Public Company
Accounting Oversight Board (United States). Those standards require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statements and financial highlights are free of material misstatement. The Fund
is not required to have, nor were we engaged to perform, an audit of its
internal control over financial reporting. Our audits included consideration of
internal control over financial reporting as a basis for designing audit
procedures that are appropriate in the circumstances, but not for the purpose of
expressing an opinion on the effectiveness of the Fund's internal control over
financial reporting. Accordingly, we express no such opinion. An audit also
includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements, assessing the accounting principles
used and significant estimates made by management, as well as evaluating the
overall financial statement presentation. Our procedures included confirmation
of securities owned as of June 30, 2015, by correspondence with the custodian,
brokers and agent banks; where replies were not received from brokers and agent
banks, we performed other auditing procedures. We believe that our audits
provide a reasonable basis for our opinion.

In our opinion, the financial statements and financial highlights referred to
above present fairly, in all material respects, the financial position of
Pioneer Bond Fund as of June 30, 2015, the results of its operations for the
year then ended, and the changes in its net assets and the financial highlights
for each of the two years in the period then ended, in conformity with
accounting principles generally accepted in the United States of America.

/s/ Diloitte & Touch LLP

Boston, Massachusetts
August 21, 2015

                                  Pioneer Bond Fund | Annual Report | 6/30/15 89


ADDITIONAL INFORMATION (unaudited)

The percentage of the Fund's ordinary income distributions that are exempt from
nonresident alien (NRA) tax withholding resulting from qualified interest income
was 80.89%.

90 Pioneer Bond Fund | Annual Report | 6/30/15


Trustees, Officers and Service Providers

Investment Adviser
Pioneer Investment Management, Inc.

Custodian and Sub-Administrator
Brown Brothers Harriman & Co.

Independent Registered Public Accounting Firm
Deloitte & Touche LLP

Principal Underwriter
Pioneer Funds Distributor, Inc.

Legal Counsel
Morgan, Lewis & Bockius LLP

Shareowner Services and Transfer Agent
Pioneer Investment Management Shareholder Services, Inc.

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

Trustees and Officers

The Fund's Trustees and officers are listed below, together with their principal
occupations during at least the past five years. Trustees who are interested
persons of the Fund within the meaning of the 1940 Act are referred to as
Interested Trustees. Trustees who are not interested persons of the Fund are
referred to as Independent Trustees. Each of the Trustees serves as a Trustee of
each of the 51 U.S. registered investment portfolios for which Pioneer serves as
investment adviser (the "Pioneer Funds"). The address for all Trustees and all
officers of the Fund is 60 State Street, Boston, Massachusetts 02109.

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

                                  Pioneer Bond Fund | Annual Report | 6/30/15 91


Independent Trustees



------------------------------------------------------------------------------------------------------------------------------------
Name, Age and                Term of Office and                                                       Other Directorships
Position Held with the Fund  Length of Service     Principal Occupation                               Held by Trustee
------------------------------------------------------------------------------------------------------------------------------------
                                                                                             
Thomas J. Perna (64)         Trustee since 2006.   Private investor (2004 - 2008 and 2013 -           Director, Broadridge Financial
Chairman of the Board        Serves until a        present); Chairman (2008 - 2013) and Chief         Solutions, Inc.(investor
and Trustee                  successor trustee     Executive Officer (2008 - 2012), Quadriserv, Inc.  communications and securities
                             is elected or         (technology products for securities lending        processing provider for
                             earlier retirement    industry); and Senior Executive Vice President,    financial services industry)
                             or removal.           The Bank of New York (financial and securities     (2009 - present); Director,
                                                   services) (1986 - 2004)                            Quadriserv, Inc. (2005 -
                                                                                                      2013); and Commissioner, New
                                                                                                      Jersey State Civil Service
                                                                                                      Commission (2011 - present)
------------------------------------------------------------------------------------------------------------------------------------
David R. Bock (71)           Trustee since 2005.   Managing Partner, Federal City Capital Advisors    Director of New York Mortgage
Trustee                      Serves until a        (corporate advisory services company) (1997 -      Trust (publicly-traded
                             successor trustee is  2004 and 2008 - present); Interim Chief Executive  mortgage REIT) (2004 - 2009,
                             elected or earlier    Officer, Oxford Analytica, Inc. (privately-held    2012 - present); Director of
                             retirement or         research and consulting company) (2010);           The Swiss Helvetia Fund, Inc.
                             removal.              Executive Vice President and Chief Financial       (closed-end fund) (2010 -
                                                   Officer, I-trax, Inc. (publicly traded health      present); Director of Oxford
                                                   care services company) (2004 - 2007); and          Analytica, Inc. (2008 -
                                                   Executive Vice President and Chief Financial       present); and Director of
                                                   Officer, Pedestal Inc. (internet-based mortgage    Enterprise Community
                                                   trading company) (2000 - 2002); Private            Investment, Inc.
                                                   consultant (1995-1997), Managing Director, Lehman  (privately-held affordable
                                                   Brothers (investment banking firm) (1992-1995);    housing 3nance company) (1985
                                                   and Executive, The World Bank (1979-1992)          - 2010)
------------------------------------------------------------------------------------------------------------------------------------
Benjamin M. Friedman (70)    Trustee since 2008.   William Joseph Maier Professor of Political        Trustee, Mellon Institutional
Trustee                      Serves until a        Economy, Harvard University (1972 - present)       Funds Investment Trust and
                             successor trustee is                                                     Mellon Institutional Funds
                             elected or earlier                                                       Master Portfolio (oversaw 17
                             retirement or                                                            portfolios in fund complex)
                             removal.                                                                 (1989-2008)
------------------------------------------------------------------------------------------------------------------------------------


92 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------------------------------------
Name, Age and                Term of Office and                                                       Other Directorships
Position Held with the Fund  Length of Service     Principal Occupation                               Held by Trustee
------------------------------------------------------------------------------------------------------------------------------------
                                                                                             
Margaret B.W. Graham (68)    Trustee since 1996.   Founding Director, Vice President and Corporate     None
Trustee                      Serves until a        Secretary, The Winthrop Group, Inc. (consulting
                             successor trustee is  firm) (1982 - present); Desautels Faculty of
                             elected or earlier    Management, McGill University (1999 - present);
                             retirement or         and Manager of Research Operations and
                             removal.              Organizational Learning, Xerox PARC, Xerox's
                                                   advance research center (1990-1994)
------------------------------------------------------------------------------------------------------------------------------------
Marguerite A. Piret (67)     Trustee since 1996.   President and Chief Executive Officer, Newbury,    Director of New America High
Trustee                      Serves until a        Piret & Company, Inc. (investment banking firm)    Income Fund, Inc. (closed-end
                             successor trustee is  (1981 - present)                                   investment company) (2004 -
                             elected or earlier                                                       present); and Member, Board
                             retirement or                                                            of Governors, Investment
                             removal.                                                                 Company Institute (2000 -
                                                                                                      2006)
------------------------------------------------------------------------------------------------------------------------------------
Fred J. Ricciardi (68)       Trustee since 2014.   Consultant (investment company services) (2012 -   None
Trustee                      Serves until a        present); Executive Vice President, BNY Mellon
                             successor trustee is  (financial and investment company services) (1969
                             elected or earlier    - 2012); Director, BNY International Financing
                             retirement or         Corp. (financial services) (2002 - 2012); and
                             removal.              Director, Mellon Overseas Investment Corp.
                                                   (financial services) (2009 - 2012)
------------------------------------------------------------------------------------------------------------------------------------


                                  Pioneer Bond Fund | Annual Report | 6/30/15 93


Interested Trustee



------------------------------------------------------------------------------------------------------------------------------------
Name, Age and                Term of Office and                                                       Other Directorships
Position Held with the Fund  Length of Service     Principal Occupation                               Held by Trustee
------------------------------------------------------------------------------------------------------------------------------------
                                                                                             
Kenneth J. Taubes (57)*      Trustee since 2014.   Director and Executive Vice President (since       None
Trustee                      Serves until a        2008) and Chief Investment Officer, U.S. (since
                             successor trustee is  2010) of PIM-USA; Executive Vice President of
                             elected or earlier    Pioneer (since 2008); Executive Vice President
                             retirement or         of Pioneer Institutional Asset Management, Inc.
                             removal.              (since 2009); and Portfolio Manager of Pioneer
                                                   (since 1999)
------------------------------------------------------------------------------------------------------------------------------------


*    Mr. Taubes is an Interested Trustee because he is an officer of the Fund's
     investment adviser and certain of its affiliates.

94 Pioneer Bond Fund | Annual Report | 6/30/15


Advisory Trustee



------------------------------------------------------------------------------------------------------------------------------------
Name, Age and                Term of Office and                                                           Other Directorships
Position Held with the Fund  Length of Service     Principal Occupation                                   Held by Trustee
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                 
Lorraine Monchak (59)**      Advisory Trustee      Chief Investment Officer, 1199 SEIU Funds              None
Advisory Trustee             since 2014.           (healthcare workers union pension funds) (2001 -
                                                   present); Vice President - International
                                                   Investments  Group, American International Group,
                                                   Inc. (insurance company) (1993 - 2001); Vice
                                                   President Corporate Finance and Treasury Group,
                                                   Citibank, N.A. (1980 - 1986 and 1990 - 1993);
                                                   Vice President - Asset/Liability Management
                                                   Group, Federal Farm Funding Corporation
                                                   (government-sponsored issuer of debt securities)
                                                   (1988 - 1990); Mortgage Strategies Group,
                                                   Shearson Lehman Hutton, Inc. (investment bank)
                                                   (1987 - 1988); and Mortgage Strategies Group,
                                                   Drexel Burnham Lambert, Ltd. (investment bank)
                                                   (1986 - 1987)
------------------------------------------------------------------------------------------------------------------------------------


**   Ms. Monchak is a non-voting advisory trustee.

                                  Pioneer Bond Fund | Annual Report | 6/30/15 95


Fund Officers



------------------------------------------------------------------------------------------------------------------------------------
Name, Age and                Term of Office and                                                           Other Directorships
Position Held with the Fund  Length of Service     Principal Occupation                                   Held by Officer
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                 
Lisa M. Jones (53)           Since 2014. Serves    Chair, Director, CEO and President of Pioneer          None
President and Chief          at the discretion     Investment Management-USA (since September 2014);
Executive Officer            of the Board.         Chair, Director, CEO and President of Pioneer
                                                   Investment Management, Inc. (since September 2014);
                                                   Chair, Director, CEO and President of Pioneer Funds
                                                   Distributor, Inc. (since September 2014); Chair,
                                                   Director, CEO and President of Pioneer Institutional
                                                   Asset Management, Inc. (since September 2014); and
                                                   Chair, Director, and CEO of Pioneer Investment
                                                   Management Shareholder Services, Inc. (since
                                                   September 2014); Managing Director, Morgan Stanley
                                                   Investment Management (2010 - 2013); and Director of
                                                   Institutional Business, CEO of International, Eaton
                                                   Vance Management (2005 - 2010)
------------------------------------------------------------------------------------------------------------------------------------
Christopher J. Kelley (50)   Since 2003. Serves    Vice President and Associate General Counsel of        None
Secretary and                at the discretion     Pioneer since January 2008; Secretary and Chief Legal
Chief Legal Officer          of the Board.         Officer of all of the Pioneer Funds since June 2010;
                                                   Assistant Secretary of all of the Pioneer Funds from
                                                   September 2003 to May 2010; and Vice President and
                                                   Senior Counsel of Pioneer from July 2002 to December
                                                   2007
------------------------------------------------------------------------------------------------------------------------------------
Carol B. Hannigan (54)       Since 2010. Serves    Fund Governance Director of Pioneer since December     None
Assistant Secretary          at the discretion     2006 and Assistant Secretary of all the Pioneer Funds
                             of the Board.         since June 2010; Manager - Fund Governance of Pioneer
                                                   from December 2003 to November 2006; and Senior
                                                   Paralegal of Pioneer from January 2000 to November
                                                   2003
------------------------------------------------------------------------------------------------------------------------------------
Thomas Reyes (52)            Since 2010. Serves    Senior Counsel of Pioneer since May 2013 and           None
Assistant Secretary          at the discretion     Assistant Secretary of all the Pioneer Funds since
                             of the Board.         June 2010; and Counsel of Pioneer from June 2007 to
                                                   May 2013
------------------------------------------------------------------------------------------------------------------------------------
Mark E. Bradley (55)         Since 2008. Serves    Vice President - Fund Treasury of Pioneer; Treasurer   None
Treasurer and Chief          at the discretion     of all of the Pioneer Funds since March 2008; Deputy
Financial and                of the Board.         Treasurer of Pioneer from March 2004 to February
Accounting Officer                                 2008; and Assistant Treasurer of all of the Pioneer
                                                   Funds from March 2004 to February 2008
------------------------------------------------------------------------------------------------------------------------------------


96 Pioneer Bond Fund | Annual Report | 6/30/15




------------------------------------------------------------------------------------------------------------------------------------
Name, Age and                Term of Office and                                                            Other Directorships
Position Held with the Fund  Length of Service     Principal Occupation                                    Held by Officer
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                  
Luis I. Presutti (50)        Since 2000. Serves    Director - Fund Treasury of Pioneer; and Assistant      None
Assistant Treasurer          at the discretion of  Treasurer of all of the Pioneer Funds
                             the Board.
------------------------------------------------------------------------------------------------------------------------------------
Gary Sullivan (57)           Since 2002. Serves    Fund Accounting Manager - Fund Treasury of Pioneer;     None
Assistant Treasurer          at the discretion of  and Assistant Treasurer of all of the Pioneer Funds
                             the Board.
------------------------------------------------------------------------------------------------------------------------------------
David F. Johnson (35)        Since 2009. Serves    Fund Administration Manager - Fund Treasury of Pioneer  None
Assistant Treasurer          at the discretion of  since November 2008; Assistant Treasurer of all of the
                             the Board.            Pioneer Funds since January 2009; and Client Service
                                                   Manager - Institutional Investor Services at State
                                                   Street Bank from March 2003 to March 2007
------------------------------------------------------------------------------------------------------------------------------------
Jean M. Bradley (62)         Since 2010. Serves    Chief Compliance Officer of Pioneer and of all the      None
Chief Compliance Officer     at the discretion of  Pioneer Funds since March 2010; Chief Compliance
                             the Board.            Officer of Pioneer Institutional Asset Management,
                                                   Inc. since January 2012; Chief Compliance Officer of
                                                   Vanderbilt Capital Advisors, LLC since July 2012:
                                                   Director of Adviser and Portfolio Compliance at
                                                   Pioneer since October 2005; and Senior Compliance
                                                   Officer for Columbia Management Advisers, Inc. from
                                                   October 2003 to October 2005
------------------------------------------------------------------------------------------------------------------------------------
Kelly O'Donnell (44)         Since 2006. Serves    Director - Transfer Agency Compliance of Pioneer and    None
Anti-Money                   at the discretion of  Anti-Money Laundering Officer of all the Pioneer Funds
Laundering Officer           the Board.            since 2006
------------------------------------------------------------------------------------------------------------------------------------


                                  Pioneer Bond Fund | Annual Report | 6/30/15 97



                           This page for your notes.

98 Pioneer Bond Fund | Annual Report | 6/30/15


                           This page for your notes.

                                  Pioneer Bond Fund | Annual Report | 6/30/15 99


                           This page for your notes.

100 Pioneer Bond Fund | Annual Report | 6/30/15


How to Contact Pioneer

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

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

FactFone(SM) for automated fund yields, prices,
account information and transactions                              1-800-225-4321

Retirement plans information                                      1-800-622-0176

Write to us:
--------------------------------------------------------------------------------
PIMSS, Inc.
P.O. Box 55014
Boston, Massachusetts 02205-5014

Our toll-free                                                     1-800-225-4240

Our internet e-mail address                   ask.pioneer@pioneerinvestments.com
(for general questions about Pioneer only)


Visit our web site: us.pioneerinvestments.com

This report must be preceded or accompanied by a prospectus.

The Fund files a complete schedule of investments with the Securities and
Exchange Commission for the first and third quarters for each fiscal year on
Form N-Q. Shareholders may view the filed Form N-Q by visiting the Commission's
web site at http://www.sec.gov. The filed form may also be viewed and copied at
the Commission's Public Reference Room in Washington, DC. Information regarding
the operations of the Public Reference Room may be obtained by calling
1-800-SEC-0330.


[LOGO] PIONEER
       Investments(R)

Pioneer Investment Management, Inc.
60 State Street
Boston, MA 02109
us.pioneerinvestments.com

Securities offered through Pioneer Funds Distributor, Inc.
60 State Street, Boston, MA 02109
Underwriter of Pioneer Mutual Funds, Member SIPC
(C) 2015 Pioneer Investments 19398-09-0815



ITEM 2. CODE OF ETHICS.

(a) Disclose whether, as of the end of the period covered by the report, the
registrant has adopted a code of ethics that applies to the registrant's
principal executive officer, principal financial officer, principal accounting
officer or controller, or persons performing similar functions, regardless of
whether these individuals are employed by the registrant or a third party.  If
the registrant has not adopted such a code of ethics, explain why it has not
done so.

The registrant has adopted, as of the end of the period covered by this report,
a code of ethics that applies to the registrant's principal executive officer,
principal financial officer, principal accounting officer and controller.

(b) For purposes of this Item, the term "code of ethics" means written standards
that are reasonably designed to deter wrongdoing and to promote:

        (1) Honest and ethical conduct, including the ethical handling of actual
        or apparent conflicts of interest between personal and professional
        relationships;

        (2) Full, fair, accurate, timely, and understandable disclosure in
        reports and documents that a registrant files with, or submits to, the
        Commission and in other public communications made by the registrant;

        (3) Compliance with applicable governmental laws, rules, and
        regulations;

        (4) The prompt internal reporting of violations of the code to an
        appropriate person or persons identified in the code; and

        (5) Accountability for adherence to the code.

(c) The registrant must briefly describe the nature of any amendment, during the
period covered by the report, to a provision of its code of ethics that applies
to the registrant's principal executive officer, principal financial officer,
principal accounting officer or controller, or persons performing similar
functions, regardless of whether these individuals are employed by the
registrant or a third party, and that relates to any element of the code of
ethics definition enumerated in paragraph (b) of this Item. The registrant must
file a copy of any such amendment as an exhibit pursuant to Item 10(a), unless
the registrant has elected to satisfy paragraph (f) of this Item by posting its
code of ethics on its website pursuant to paragraph (f)(2) of this Item, or by
undertaking to provide its code of ethics to any person without charge, upon
request, pursuant to paragraph (f)(3) of this Item.

The registrant has made no amendments to the code of ethics during the period
covered by this report.

(d) If the registrant has, during the period covered by the report, granted a
waiver, including an implicit waiver, from a provision of the code of ethics to
the registrant's principal executive officer, principal financial officer,
principal accounting officer or controller, or persons performing similar
functions, regardless of whether these individuals are employed by the
registrant or a third party, that relates to one or more of the items set forth
in paragraph (b) of this Item, the registrant must briefly describe the nature
of the waiver, the name of the person to whom the waiver was granted, and the
date of the waiver.

Not applicable.

(e) If the registrant intends to satisfy the disclosure requirement under
paragraph (c) or (d) of this Item regarding an amendment to, or a waiver from,
a provision of its code of ethics that applies to the registrant's principal
executive officer, principal financial officer, principal accounting officer or
controller, or persons performing similar functions and that relates to any
element of the code of ethics definition enumerated in paragraph (b) of this
Item by posting such information on its Internet website, disclose the
registrant's Internet address and such intention.

Not applicable.

(f) The registrant must:

        (1) File with the Commission, pursuant to Item 12(a)(1), a copy of
        its code of ethics that applies to the registrant's principal
        executive officer,principal financial officer, principal accounting
        officer or controller, or persons performing similar functions,
        as an exhibit to its annual
        report on this Form N-CSR (see attachment);

        (2) Post the text of such code of ethics on its Internet website and
        disclose, in its most recent report on this Form N-CSR, its Internet
        address and the fact that it has posted such code of ethics on its
        Internet website; or

        (3) Undertake in its most recent report on this Form N-CSR to provide to
        any person without charge, upon request, a copy of such code of ethics
        and explain the manner in which such request may be made.
	See Item 10(2)

ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT.

(a) (1)  Disclose that the registrant's board of trustees has determined that
         the registrant either:

    (i)  Has at least one audit committee financial expert serving on its audit
         committee; or

    (ii) Does not have an audit committee financial expert serving on its audit
         committee.

The registrant's Board of Trustees has determined that the registrant has at
least one audit committee financial expert.

    (2) If the registrant provides the disclosure required by paragraph
(a)(1)(i) of this Item, it must disclose the name of the audit committee
financial expert and whether that person is "independent." In order to be
considered "independent" for purposes of this Item, a member of an audit
committee may not, other than in his or her capacity as a member of the audit
committee, the board of trustees, or any other board committee:

    (i)  Accept directly or indirectly any consulting, advisory, or other
         compensatory fee from the issuer; or

    (ii) Be an "interested person" of the investment company as defined in
         Section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19)).

Ms. Marguerite A. Piret, an independent trustee, is such an audit committee
financial expert.

    (3) If the registrant provides the disclosure required by paragraph (a)(1)
(ii) of this Item, it must explain why it does not have an audit committee
financial expert.

Not applicable.


ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES.

(a) Disclose, under the caption AUDIT FEES, the aggregate fees billed for each
of the last two fiscal years for professional services rendered by the principal
accountant for the audit of the registrant's annual financial statements or
services that are normally provided by the accountant in connection with
statutory and regulatory filings or engagements for those fiscal years.

The audit fees for the Fund were $56,422
payable to Deloitte & Touche LLP for the year ended
June 30, 2015 and $40,803 for the year ended June 30, 2014.

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

There were no audit-related services in 2015 or 2014.



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

The tax fees for the Fund were $8,750
payable to Deloitte & Touche LLP for the year ended
June 30, 2015 and $7,100 for the year ended June 30, 2014.

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

There were no other fees in 2015 or 2014.

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

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

                  SECTION I - POLICY PURPOSE AND APPLICABILITY

The Pioneer Funds recognize the importance of maintaining the independence of
their outside auditors. Maintaining independence is a shared responsibility
involving Pioneer Investment Management, Inc ("PIM"), the audit committee and
the independent auditors.

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

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

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

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



                               SECTION II - POLICY

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

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

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

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




                     SECTION III - POLICY DETAIL, CONTINUED

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

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

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

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




                     SECTION III - POLICY DETAIL, CONTINUED

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

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

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




                     SECTION III - POLICY DETAIL, CONTINUED

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

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

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

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

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

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


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

Non-Audit Services
Beginning with non-audit service contracts entered
into on or after May 6, 2003, the effective date of the
new SEC pre-approval rules, the Fund's audit
committee is required to pre-approve services to
affiliates defined by SEC rules to the extent that the
services are determined to have a direct impact on the
operations or financial reporting of the Trust.  For the
years ended June 30, 2015 and 2014, there were no
services provided to an affiliate that required the
Fund's audit committee pre-approval.

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

N/A

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

The aggregate non-audit fees for the Fund were $8,750
payable to Deloitte & Touche LLP for the year ended
June 30, 2015 and $7,100 for the year ended June 30, 2015.
2013.

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

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

ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS

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

N/A

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

N/A

ITEM 6. SCHEDULE OF INVESTMENTS.

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

Included in Item 1


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

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

Not applicable to open-end management investment companies.



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

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


Not applicable to open-end management investment companies.


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

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

Not applicable to open-end management investment companies.


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

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


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


ITEM 11. CONTROLS AND PROCEDURES.

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

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


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

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

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

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


ITEM 12. EXHIBITS.

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

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



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

Filed herewith.





                                   SIGNATURES

                          [See General Instruction F]


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


(Registrant) Pioneer Bond Fund


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

Date August 28, 2015


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 August 28, 2015


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

Date August 28, 2015

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