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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, 2013 through December 31, 2013


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

--------------------------------------------------------------------------------
                        Semiannual Report | December 31, 2013
--------------------------------------------------------------------------------

                        Ticker Symbols:

                        Class A     PIOBX
                        Class B     PBOBX
                        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



                                                                           
Letter to Shareowners                                                          2

Portfolio Management Discussion                                                4

Portfolio Summary                                                              9

Prices and Distributions                                                      10

Performance Update                                                            11

Comparing Ongoing Fund Expenses                                               18

Schedule of Investments                                                       20

Financial Statements                                                          70

Notes to Financial Statements                                                 81

Approval of Investment Advisory Agreement                                     92

Trustees, Officers and Service Providers                                      97


                              Pioneer Bond Fund | Semiannual Report | 12/31/13 1


President's Letter

Dear Shareowner,

When we look into 2014, we foresee U.S. economic growth matching or exceeding
2013 levels. While unemployment remains high, employment has been rising
steadily. Consumer incomes, savings, wealth, and debt-servicing capacity have
been solid buttresses for the recovering housing and auto industries. Industrial
activity is growing only moderately, but current corporate profits are generally
solid and balance sheets appear able to support needed capital spending and
dividend* payouts. Tax hikes, spending restraint and a better economy have
meaningfully cut the federal budget deficit. A modestly improving European
economy, continuing economic improvement in Japan, and a "soft landing" of 7%
growth in China appear likely to result in improving global growth in 2014,
further supporting the U.S. economy. In addition, we feel that continuing slack
in labor markets and capacity utilization offers the potential for continuing
growth without bottlenecks and rising inflation, making it possible for the
Federal Reserve (the Fed) to continue its accommodative monetary policies.

After observing the strengthening economic trends, the Fed decided in December
2013 to start scaling back its QE (quantitative easing) program, but also said
that short-term interest rates are likely to remain near zero for some time to
come, given that inflation remains subdued and unemployment remains high.

The U.S. government's partial shutdown in October 2013 rattled the markets to a
degree, but does not appear to have had a significant negative impact on the
economy or capital markets. As the year drew to a close, leaders in Washington
reached a bipartisan budget agreement that establishes top-line government
spending levels for the next two fiscal years, a move which should help to
defuse the threat of another shutdown. That certainly was welcome news for
investors who had grown weary of infighting in Washington and wary of the risks
the policy uncertainty caused.

There are certainly risks and uncertainties facing the global economy as we head
into 2014. The European economy, while improving, remains weak, the Japanese
economy faces a tax hike this spring, and a number of emerging market countries
are experiencing difficulties. There are also geopolitical worries abroad and
the aforementioned political fights at home. While most of the widely recognized
risks we've outlined may already be "priced into" the market, we believe
investors should continue to expect market volatility.

*  Dividends are not guaranteed.

2 Pioneer Bond Fund | Semiannual Report | 12/31/13


At Pioneer, we have long advocated the benefits of staying diversified and
investing for the long term. And while diversification does not assure a profit
or protect against loss in a declining market, we believe there are still
opportunities for prudent investors to earn attractive returns. Our advice, as
always, is to work closely with a trusted financial advisor to discuss your
goals and work together to develop an investment strategy that meets your
individual needs, keeping in mind that there is no single best strategy that
works for every investor.

Pioneer's investment teams have, since 1928, sought out attractive opportunities
in global equity and bond markets, using in-depth research to identify
undervalued individual securities, and using thoughtful risk management to
construct portfolios which seek to balance potential risks and reward in an
ever-changing world.

We encourage you to learn more about Pioneer and our time-tested approach to
investing by consulting with your financial advisor or visiting us online at
us.pioneerinvestments.com. We greatly appreciate your trust in us, and we thank
you for investing with Pioneer.

Sincerely,

/s/ Daniel K. Kingsbury

Daniel K. Kingsbury
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 | Semiannual Report | 12/31/13 3


Portfolio Management Discussion | 12/31/13

Domestic fixed-income sectors produced mixed results during the six-month period
ended December 31, 2013, as rising interest rates resulted in price declines for
many securities. At the same time, a strengthening economy helped to produce
positive performance by corporate bonds and other credit-sensitive securities.
In the following interview, Kenneth J. Taubes reviews the market environment and
the factors that affected the performance of Pioneer Bond Fund during the six-
month period ended December 31, 2013. Mr. Taubes, Chief Investment Officer,
U.S., and a portfolio manager at Pioneer Investments, is responsible for the
daily management of the Fund, along with Charles Melchreit, a senior vice
president and a portfolio manager at Pioneer.

Q   How did the Fund perform during the six-month period ended December 31,
    2013?

A   Pioneer Bond Fund's Class A shares returned 1.47% at net asset value during
    the six-month period ended December 31, 2013, while the Fund's benchmark,
    the Barclays Aggregate Bond Index (the Barclays Index), returned 0.43%.
    During the same period, the average return of the 1,100 mutual funds in
    Morningstar's Intermediate-Term Bond Funds category was 0.91%, and the
    average return of the 63 mutual funds in Lipper's Corporate Debt, A-rated
    Funds category was 1.18%.

Q   How would you describe the investment environment in the fixed-income
    markets during the six-month period ended December 31, 2013?

A   Interest rates continued to rise during the period, although not as
    dramatically as they had in May and June of 2013, when market expectations
    grew that the Federal Reserve (the Fed) soon would begin gradually reducing
    the levels of some of its monetary stimulus, particularly its quantitative
    easing (QE) bond-purchasing program. The increase in rates exerted downward
    pressure on prices in the market, as bond prices tend to decline when
    interest rates rise. During the six-month period, negative returns were
    produced by many higher-quality and longer-duration securities, particularly
    Treasuries and government agency bonds, as the yield on Five-year Treasuries
    rose by 35 basis points (0.35%) during the period, while 10-year Treasury
    yields rose by 54 basis points (0.54%). (Duration is a measure of a
    security's or portfolio's price-sensitivity to changes in interest rates.)

    While the trend of increasing rates affected most parts of the bond market,
    rates on shorter-maturity instruments remained stable. Securities with
    maturities of one-to-two years showed very little change as the Fed kept the

4 Pioneer Bond Fund | Semiannual Report | 12/31/13


    influential Fed funds rate within the historically low range of 0% to 0.25%,
    where it has been for more than five years. While rates rose on securities
    with longer and intermediate maturities and the yield curve (which reflects
    the difference in yields between longer and shorter maturity securities)
    steepened, many benchmarks for fixed-income asset classes posted negative
    returns for the full six-month period, as the yields on the bonds failed to
    compensate for the declines in their prices. In this environment, portfolios
    with longer maturities tended to underperform relative to those with shorter
    maturities, which showed more price stability.

    The story was somewhat different, however, in the more credit-sensitive
    sectors. The domestic economy showed steady, albeit slow, improvement during
    the period as new jobs were created, consumer spending expanded, the housing
    industry improved and corporate earnings rose. The improving economic
    backdrop inspired confidence in the outlook for corporate profits in
    general, and credit-sensitive securities, like corporate bonds, tended to
    outperform higher-rated securities such as Treasuries and government agency
    debt that had little or no credit exposure but greater price-sensitivity to
    the changing interest-rate environment.

Q   Which of your investment strategies had the biggest effect on the Fund's
    benchmark-relative returns during the six-month period ended December 31,
    2013?

A   The Fund outperformed both the Barclays Index benchmark and its Lipper and
    Morningstar peers during the period because of favorable sector allocation,
    good portfolio positioning with respect to interest-rate risk, and
    successful security selection.

    With regard to sector allocation, the Fund was overweight in credit-
    sensitive securities, notably investment-grade and high-yield corporate
    bonds, non-government asset-backed debt, and floating-rate bank loans.
    Conversely, we significantly underweighted the portfolio to Treasuries and
    government agency debt, including agency mortgages. The Fund's allocation
    stance helped performance as the domestic economy improved, confidence in
    credit sectors increased, and the yield spreads between lower-rated bonds
    and higher-rated bonds narrowed (yield or credit spreads are commonly
    defined as the differences in yield between Treasuries and other types of
    fixed-income securities with similar maturities). Those factors combined to
    drive significant outperformance by lower-rated, credit-sensitive
    securities during the period.

    To account for interest-rate risk, on average, we kept the overall duration
    of the Fund's investments significantly shorter - by almost one year - than
    that of the Barclays Index benchmark. As interest rates rose, the shorter-
    duration positioning left the Fund's portfolio less vulnerable to price loss
    than would a longer-duration position.

                              Pioneer Bond Fund | Semiannual Report | 12/31/13 5


    Finally, the Fund experienced good security selection results among its
    positions in credit-sensitive securities.

    On the negative side, the Fund's holdings of municipal bonds, an asset class
    that had a rough year in 2013, slightly underperformed during the six-month
    period.

    As of December 31, 2013, the Fund had an effective duration of 4.72 years.
    Investment-grade corporate bonds issued by domestic institutions represented
    the portfolio's largest concentration as of period end, at roughly 25% of
    net assets. Non-agency mortgage-backed securities and commercial
    mortgage-backed securities combined to account for around 18% of the Fund's
    net assets, while asset-backed securities represented more than 8% of net
    assets. Floating-rate bank loans accounted for just over 5% of the
    portfolio's net assets, while more than 17% of net assets were invested in a
    combination of Treasuries, government agency bonds and agency-backed
    mortgages.

Q   Which individual securities had the biggest effects on the Fund's
    benchmark-relative performance during the six-month period ended December
    31, 2013?

A   The greatest support for the Fund's returns during the period came from
    corporate debt holdings. Several portfolio holdings in the financials sector
    stood out, including securities issued by asset managers Carlyle Group and
    KKR. The debt of both companies fared well as they each benefited from
    rising prices in real estate and the capital markets. Also in the financials
    sector, securities issued by XL Capital, an insurance company, and by
    Aviation Capital, an airline leasing company, also outperformed during the
    period and aided the Fund's performance. Elsewhere, the Fund benefited from
    the performance of securities issued by Masco, a manufacturer and
    distributor of home building products, and by ArcelorMittal, a
    Luxembourg-based mining and steel company.

Q   Did you employ any derivative strategies during the six-month period ended
    December 31, 2013?

A   Yes, we invested the portfolio in some Treasury futures in an attempt to
    reduce the Fund's exposure to interest-rate risk. The use of Treasury
    futures had a positive impact on results.

6 Pioneer Bond Fund | Semiannual Report | 12/31/13


Q   What is your investment outlook?

A   We expect the domestic economy to continue to improve, with gross domestic
    growth (GDP) in 2014 outpacing 2013. One important factor should be a
    broadening of support for economic growth. In 2013, growth came principally
    from the private sector, but in 2014 we expect that spending by state and
    local governments - whose tax collections and overall finances have improved
    as the economy has recovered - will begin contributing positively to GDP
    expansion. Even the U.S. government, whose spending was limited during the
    past year by budget "sequestration" and other restrictions, should become
    less of a drag on the overall economy given the bipartisan budget agreement
    in December that eased back on the sequestration cuts.

    The U.S. economy has become more competitive in the global marketplace as a
    weakened U.S. dollar and improved access to energy sources has led to
    increased exports and a comeback by domestic manufacturers. We believe
    growth trends are likely to persist, even as the Fed begins tapering its QE
    program in January by cutting back on the pace of its monthly bond
    purchases. Given the economy's positive momentum, we don't think the Fed's
    tapering of QE will be a significant restriction on growth. We think the
    tapering is more akin to easing up on the gas pedal than putting on the
    brakes.

    As interest rates have risen during the past year and the yield curve has
    steepened, valuations of longer-maturity fixed-income securities have become
    more attractive, with 10-year Treasuries approaching a yield of 3% and
    longer-maturity Treasuries approaching 4% yields. At current levels,
    longer-term bonds no longer have negative real yields (yields adjusted for
    inflation). In contrast, intermediate- and short-maturity securities
    continue to have negative yields.

    As we enter 2014, we expect to continue to keep the Fund's portfolio
    defensively positioned, but we may add exposure to longer-maturity
    securities. With the economic expansion persisting, we believe that the
    corporate sector and credit-sensitive securities generally offer attractive
    opportunities, although we think government agency mortgages may become more
    attractive.

    Overall, we anticipate keeping the portfolio overweight in credit-sensitive
    debt, at least early in the year.

                              Pioneer Bond Fund | Semiannual Report | 12/31/13 7


Please refer to the Schedule of Investments on pages 20-69 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 fail-
ure 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.

Past performance is no guarantee of future results, and there is no guarantee
that market forecasts discussed will be realized.

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. These opinions should not
be relied upon for any other purposes.

8 Pioneer Bond Fund | Semiannual Report | 12/31/13


Portfolio Summary | 12/31/13

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                                       25.9%
Collateralized Mortgage Obligations                        19.6%
U.S. Government Securities                                 15.8%
International Corporate Bonds                              12.2%
Asset Backed Securities                                     8.7%
Municipal Bonds                                             8.2%
Senior Secured Loans                                        5.4%
U.S. Preferred Stocks                                       2.3%
Convertible Corporate Bonds                                 0.8%
Warrants                                                    0.5%
Convertible Preferred Stocks                                0.4%
International Preferred Stocks                              0.2%


Portfolio Quality
--------------------------------------------------------------------------------
(As a percentage of total investment portfolio)

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



                                                        
AAA                                                        26.3%
AA                                                         10.0%
A                                                          16.0%
BBB                                                        30.7%
BB                                                          9.8%
B                                                           3.7%
CCC                                                         0.7%
Not Rated                                                   2.1%
Cash Equivalent                                             0.7%


Bond ratings are ordered highest to lowest in portfolio. Based on Standard &
Poor's measures, AAA (highest possible rating) through BBB are considered
investment grade; BB or lower ratings are considered non-investment grade. Cash
equivalents and some bonds may not be rated.

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



                                                                             
  1.  Government National Mortgage Association I, 5.5%, 4/15/19                 5.09%
-------------------------------------------------------------------------------------
  2.  Fannie Mae, 3.0%, 8/1/42                                                  1.57
-------------------------------------------------------------------------------------
  3.  Fannie Mae, 4.5%, 1/1/42                                                  1.02
-------------------------------------------------------------------------------------
  4.  U.S. Treasury Bonds, 4.5%, 8/15/39                                        0.71
-------------------------------------------------------------------------------------
  5.  U.S. Treasury Bonds, 4.5%, 5/15/38                                        0.66
-------------------------------------------------------------------------------------
  6.  U.S. Treasury Bonds, 4.25%, 5/15/39                                       0.57
-------------------------------------------------------------------------------------
  7.  U.S. Treasury Bonds, 2.875%, 5/15/43                                      0.57
-------------------------------------------------------------------------------------
  8.  Goldman Sachs Capital II, Floating Rate Note (Perpetual)                  0.55
-------------------------------------------------------------------------------------
  9.  Massachusetts Health & Educational Facilities Authority, 5.5%, 11/15/36   0.51
-------------------------------------------------------------------------------------
 10.  Fannie Mae, 3.0%, 9/1/42                                                  0.49
-------------------------------------------------------------------------------------


*   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 | Semiannual Report | 12/31/13 9


Prices and Distributions | 12/31/13

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



--------------------------------------------------------------------------------
           Class                       12/31/13                    6/30/13
--------------------------------------------------------------------------------
                                                              
             A                           $9.60                      $9.67
--------------------------------------------------------------------------------
             B                           $9.54                      $9.61
--------------------------------------------------------------------------------
             C                           $9.49                      $9.57
--------------------------------------------------------------------------------
             K                           $9.60                      $9.67
--------------------------------------------------------------------------------
             R                           $9.68                      $9.76
--------------------------------------------------------------------------------
             Y                           $9.51                      $9.58
--------------------------------------------------------------------------------
             Z                           $9.62                      $9.70
--------------------------------------------------------------------------------


Distributions per Share: 7/1/13-12/31/13
--------------------------------------------------------------------------------



--------------------------------------------------------------------------------
                      Net Investment          Short-Term        Long-Term
        Class             Income            Capital Gains     Capital Gains
--------------------------------------------------------------------------------
                                                       
          A              $0.2115                $   --          $   --
--------------------------------------------------------------------------------
          B              $0.1601                $   --          $   --
--------------------------------------------------------------------------------
          C              $0.1676                $   --          $   --
--------------------------------------------------------------------------------
          K              $0.2255                $   --          $   --
--------------------------------------------------------------------------------
          R              $0.1936                $   --          $   --
--------------------------------------------------------------------------------
          Y              $0.2182                $   --          $   --
--------------------------------------------------------------------------------
          Z              $0.2217                $   --          $   --
--------------------------------------------------------------------------------


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 11-17.

10 Pioneer Bond Fund | Semiannual Report | 12/31/13


Performance Update | 12/31/13                                     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 December 31, 2013)
--------------------------------------------------------------------------------
                          Net Asset        Public Offering
Period                    Value (NAV)      Price (POP)
--------------------------------------------------------------------------------
                                     
10 Years                  5.34%            4.85%
5 Years                   8.12             7.13
1 Year                    0.49            -4.06
--------------------------------------------------------------------------------


Expense Ratio
(Per prospectus dated November 1, 2013)
--------------------------------------------------------------------------------
                          Gross            Net
--------------------------------------------------------------------------------
                                     
                          1.01%            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
                                             
12/31/2003                $  9550.00               $ 10000.00
12/31/2004                $ 10095.00               $ 10434.00
12/31/2005                $ 10344.00               $ 10687.00
12/31/2006                $ 10711.00               $ 11150.00
12/31/2007                $ 11363.00               $ 11927.00
12/31/2008                $ 10868.00               $ 12552.00
12/31/2009                $ 12792.00               $ 13297.00
12/31/2010                $ 13999.00               $ 14166.00
12/31/2011                $ 14710.00               $ 15277.00
12/31/2012                $ 15984.00               $ 15921.00
12/31/2013                $ 16061.00               $ 15599.00


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 | Semiannual Report | 12/31/13 11


Performance Update | 12/31/13                                     Class B Shares

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



Average Annual Total Returns
(As of December 31, 2013)
--------------------------------------------------------------------------------
                          If               If
Period                    Held             Redeemed
--------------------------------------------------------------------------------
                                    
10 Years                  4.31%            4.31%
5 Years                   7.01             7.01
1 Year                   -0.48            -4.35
--------------------------------------------------------------------------------


Expense Ratio
(Per prospectus dated November 1, 2013)
--------------------------------------------------------------------------------
                          Gross            Net
--------------------------------------------------------------------------------
                                     
                          2.05%            1.90%
--------------------------------------------------------------------------------


[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
                                             
12/31/2003                $ 10000.00               $ 10000.00
12/31/2004                $ 10482.00               $ 10434.00
12/31/2005                $ 10633.00               $ 10687.00
12/31/2006                $ 10912.00               $ 11150.00
12/31/2007                $ 11475.00               $ 11927.00
12/31/2008                $ 10866.00               $ 12552.00
12/31/2009                $ 12669.00               $ 13297.00
12/31/2010                $ 13710.00               $ 14166.00
12/31/2011                $ 14272.00               $ 15277.00
12/31/2012                $ 15322.00               $ 15921.00
12/31/2013                $ 15249.00               $ 15599.00


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.

"If Held" results represent the percent change in net asset value per share.
Returns would have been lower had sales charges been reflected. "If Redeemed"
returns reflect the deduction of applicable contingent deferred sales charge
(CDSC). The maximum CDSC for Class B shares is 4% and declines over five years.
For more complete information, please see the prospectus.

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. Please
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 B 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.

12 Pioneer Bond Fund | Semiannual Report | 12/31/13


Performance Update | 12/31/13                                     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 December 31, 2013)
--------------------------------------------------------------------------------
                          If               If
Period                    Held             Redeemed
--------------------------------------------------------------------------------
                                    
10 Years                  4.41%            4.41%
5 Years                   7.15             7.15
1 Year                   -0.41            -0.41
--------------------------------------------------------------------------------


Expense Ratio
(Per prospectus dated November 1, 2013)
--------------------------------------------------------------------------------
                          Gross
--------------------------------------------------------------------------------
                       
                          1.72%
--------------------------------------------------------------------------------


[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
                                             
12/31/2003                $ 10000                  $ 10000
12/31/2004                $ 10492                  $ 10434
12/31/2005                $ 10648                  $ 10687
12/31/2006                $ 10921                  $ 11150
12/31/2007                $ 11502                  $ 11927
12/31/2008                $ 10899                  $ 12552
12/31/2009                $ 12712                  $ 13297
12/31/2010                $ 13780                  $ 14166
12/31/2011                $ 14356                  $ 15277
12/31/2012                $ 15457                  $ 15921
12/31/2013                $ 15393                  $ 15599


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). The performance shown for Class C shares does not
reflect the 1% front-end sales charge in effect prior to February 1, 2004. 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.

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 13


Performance Update | 12/31/13                                     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 December 31, 2013)
--------------------------------------------------------------------------------
                          If               If
Period                    Held             Redeemed
--------------------------------------------------------------------------------
                                     
10 Years                  5.37%            5.37%
5 Years                   8.19             8.19
1 Year                    0.89             0.89
--------------------------------------------------------------------------------


Expense Ratio
(Per prospectus dated November 1, 2013)
--------------------------------------------------------------------------------
                          Gross
--------------------------------------------------------------------------------
                       
                          0.57%
--------------------------------------------------------------------------------


[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
                                             
12/31/2003                $ 10000                  $ 10,000
12/31/2004                $ 10571                  $ 10,434
12/31/2005                $ 10831                  $ 10,687
12/31/2006                $ 11216                  $ 11,150
12/31/2007                $ 11899                  $ 11,927
12/31/2008                $ 11380                  $ 12,552
12/31/2009                $ 13394                  $ 13,297
12/31/2010                $ 14659                  $ 14,166
12/31/2011                $ 15403                  $ 15,277
12/31/2012                $ 16721                  $ 15,921
12/31/2013                $ 16871                  $ 15,599


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.

14 Pioneer Bond Fund | Semiannual Report | 12/31/13


Performance Update | 12/31/13                                     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 December 31, 2013)
--------------------------------------------------------------------------------
                          If               If
Period                    Held             Redeemed
--------------------------------------------------------------------------------
                                     
10 Years                  4.99%            4.99%
5 Years                   7.71             7.71
1 Year                    0.11             0.11
--------------------------------------------------------------------------------


Expense Ratio
(Per prospectus dated November 1, 2013)
--------------------------------------------------------------------------------
                          Gross            Net
--------------------------------------------------------------------------------
                                     
                          1.35%            1.25%
--------------------------------------------------------------------------------


[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
                                             
12/31/2003                $ 10000                  $ 10,000
12/31/2004                $ 10562                  $ 10,434
12/31/2005                $ 10785                  $ 10,687
12/31/2006                $ 11141                  $ 11,150
12/31/2007                $ 11806                  $ 11,927
12/31/2008                $ 11231                  $ 12,552
12/31/2009                $ 13175                  $ 13,297
12/31/2010                $ 14372                  $ 14,166
12/31/2011                $ 15046                  $ 15,277
12/31/2012                $ 16261                  $ 15,921
12/31/2013                $ 16279                  $ 15,599


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, 2015, 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.

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 15


Performance Update | 12/31/13                                     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 December 31, 2013)
--------------------------------------------------------------------------------
                          If               If
Period                    Held             Redeemed
--------------------------------------------------------------------------------
                                     
10 Years                  5.66%            5.66%
5 Years                   8.36             8.36
1 Year                    0.66             0.66
--------------------------------------------------------------------------------


Expense Ratio
(Per prospectus dated November 1, 2013)
--------------------------------------------------------------------------------
                          Gross
--------------------------------------------------------------------------------
                       
                          0.66%
--------------------------------------------------------------------------------


[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
                                             
12/31/2003                $ 5000000                $ 5,000,000
12/31/2004                $ 5317401                $ 5,216,930
12/31/2005                $ 5464957                $ 5,343,652
12/31/2006                $ 5682750                $ 5,575,213
12/31/2007                $ 6051561                $ 5,963,623
12/31/2008                $ 5806117                $ 6,276,112
12/31/2009                $ 6848444                $ 6,648,338
12/31/2010                $ 7516395                $ 7,083,233
12/31/2011                $ 7917778                $ 7,638,678
12/31/2012                $ 8616708                $ 7,960,664
12/31/2013                $ 8673367                $ 7,799,542


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.

16 Pioneer Bond Fund | Semiannual Report | 12/31/13


Performance Update | 12/31/13                                     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 December 31, 2013)
--------------------------------------------------------------------------------
                          If               If
Period                    Held             Redeemed
--------------------------------------------------------------------------------
                                     
10 Years                  5.52%            5.52%
5 Years                   8.40             8.40
1 Year                    0.69             0.69
--------------------------------------------------------------------------------


Expense Ratio
(Per prospectus dated November 1, 2013)
--------------------------------------------------------------------------------
                          Gross            Net
--------------------------------------------------------------------------------
                                     
                          0.87%            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
                                             
12/31/2003                $ 10000                  $ 10,000
12/31/2004                $ 10571                  $ 10,434
12/31/2005                $ 10831                  $ 10,687
12/31/2006                $ 11216                  $ 11,150
12/31/2007                $ 11928                  $ 11,927
12/31/2008                $ 11438                  $ 12,552
12/31/2009                $ 13538                  $ 13,297
12/31/2010                $ 14832                  $ 14,166
12/31/2011                $ 15616                  $ 15,277
12/31/2012                $ 17000                  $ 15,921
12/31/2013                $ 17117                  $ 15,599


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.

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 17


Comparing Ongoing Fund Expenses

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

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

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

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

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

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

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

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

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

Based on actual returns from July 1, 2013 through December 31, 2013.



-----------------------------------------------------------------------------------------------------------
Share Class                   A           B           C           K           R           Y           Z
-----------------------------------------------------------------------------------------------------------
                                                                             
Beginning Account         $1,000.00   $1,000.00   $1,000.00   $1,000.00   $1,000.00   $1,000.00   $1,000.00
Value on 7/1/13
-----------------------------------------------------------------------------------------------------------
Ending Account            $1,014.70   $1,009.40   $1,009.20   $1,016.20   $1,011.70   $1,015.60   $1,014.70
Value (after expenses)
on 12/31/13
-----------------------------------------------------------------------------------------------------------
Expenses Paid             $    4.32   $    9.62   $    8.66   $    4.07   $    6.34   $    3.35   $    3.30
During Period*
-----------------------------------------------------------------------------------------------------------


*   Expenses are equal to the Fund's annualized net expense ratio of 0.85%,
    1.90%, 1.71%, 0.80%, 1.25%, 0.66%, and 0.65% for Class A, Class B, Class C,
    Class K, Class R, Class Y, and Class Z shares, respectively, multiplied by
    the average account value over the period, multiplied by 184/365 (to reflect
    the one-half year period).

18 Pioneer Bond Fund | Semiannual Report | 12/31/13


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 July 1, 2013 through December 31, 2013.



-----------------------------------------------------------------------------------------------------------
Share Class                   A           B           C           K           R           Y           Z
-----------------------------------------------------------------------------------------------------------
                                                                             
Beginning Account         $1,000.00   $1,000.00   $1,000.00   $1,000.00   $1,000.00   $1,000.00   $1,000.00
Value on 7/1/13
-----------------------------------------------------------------------------------------------------------
Ending Account            $1,020.92   $1,015.63   $1,016.59   $1,021.17   $1,018.90   $1,021.88   $1,021.93
Value (after expenses)
on 12/31/13
-----------------------------------------------------------------------------------------------------------
Expenses Paid             $    4.33   $    9.65   $    8.69   $    4.08   $    6.36   $    3.36   $    3.31
During Period*
-----------------------------------------------------------------------------------------------------------


*   Expenses are equal to the Fund's annualized net expense ratio of 0.85%,
    1.90%, 1.71%, 0.80%, 1.25%, 0.66%, and 0.65% for Class A, Class B, Class C,
    Class K, Class R, Class Y, and Class Z shares, respectively, multiplied by
    the average account value over the period, multiplied by 184/365 (to reflect
    the one-half year period).

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 19


Schedule of Investments | 12/31/13 (unaudited)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          CONVERTIBLE CORPORATE
                                          BONDS -- 0.8%
                                          HEALTH CARE EQUIPMENT &
                                          SERVICES -- 0.4%
                                          Health Care Services -- 0.0%+
       766,000                    B+/B2   Omnicare, Inc., 3.25%, 12/15/35           $     818,662
-------------------------------------------------------------------------------------------------
                                          Managed Health Care -- 0.4%
     4,090,000                    A-/NR   WellPoint, Inc., 2.75%, 10/15/42          $   5,536,838
                                                                                    -------------
                                          Total Health Care Equipment
                                          & Services                                $   6,355,500
-------------------------------------------------------------------------------------------------
                                          SEMICONDUCTORS &
                                          SEMICONDUCTOR EQUIPMENT -- 0.4%
                                          Semiconductors -- 0.4%
     4,725,000                    A-/NR   Intel Corp., 2.95%, 12/15/35              $   5,292,000
                                                                                    -------------
                                          Total Semiconductors &
                                          Semiconductor Equipment                   $   5,292,000
-------------------------------------------------------------------------------------------------
                                          TOTAL CONVERTIBLE
                                          CORPORATE BONDS
                                          (Cost $9,553,849)                         $  11,647,500
-------------------------------------------------------------------------------------------------


-------------------------------------------------------------------------------------------------
Shares
-------------------------------------------------------------------------------------------------
                                                                        
                                          PREFERRED STOCKS -- 2.6%
                                          BANKS -- 1.0%
                                          Diversified Banks -- 0.6%
        64,000       6.50       A-/Baa1   US Bancorp, Floating Rate
                                          Note (Perpetual)                          $   1,683,200
       235,000       6.00       A-/Baa1   US Bancorp, Floating Rate
                                          Note (Perpetual)                              6,431,950
                                                                                    -------------
                                                                                    $   8,115,150
-------------------------------------------------------------------------------------------------
                                          Regional Banks -- 0.4%
        85,000                 BBB/Baa2   BB&T Corp., 5.625% (Perpetual)            $   1,729,750
        28,000       6.25         A-/NR   CoBank ACB, Floating Rate Note
                                          (Perpetual) (144A)                            2,696,750
        43,050       6.62      BBB-/Ba1   Fifth Third Bancorp, Floating Rate
                                          Note (Perpetual)                              1,074,958
                                                                                    -------------
                                                                                    $   5,501,458
                                                                                    -------------
                                          Total Banks                               $  13,616,608
-------------------------------------------------------------------------------------------------
                                          DIVERSIFIED FINANCIALS -- 0.6%
                                          Other Diversified Financial
                                          Services -- 0.6%
       116,000       7.88       BB+/Ba2   Citigroup Capital XIII, Floating
                                          Rate Note, 10/30/40                       $   3,161,000


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

20 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
                 Floating   S&P/Moody's
Shares           Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Other Diversified Financial
                                          Services -- (continued)
       197,000       7.12        BB+/B1   Citigroup, Inc., Floating Rate
                                          Note (Perpetual)                          $   5,110,180
                                                                                    -------------
                                                                                    $   8,271,180
                                                                                    -------------
                                          Total Diversified Financials              $   8,271,180
-------------------------------------------------------------------------------------------------
                                          INSURANCE -- 0.8%
                                          Life & Health Insurance -- 0.3%
       153,800       7.38       BBB-/WR   Delphi Financial Group, Inc., Floating
                                          Rate Note, 5/15/37                        $   3,806,550
-------------------------------------------------------------------------------------------------
                                          Property & Casualty Insurance -- 0.3%
        50,000       5.95      BBB-/Ba1   Aspen Insurance Holdings, Ltd.,
                                          Floating Rate Note (Perpetual)            $   1,133,500
       147,475       5.10      BBB/Baa1   The Allstate Corp., Floating Rate
                                          Note, 1/15/53                                 3,555,622
                                                                                    -------------
                                                                                    $   4,689,122
-------------------------------------------------------------------------------------------------
                                          Reinsurance -- 0.2%
       900,000       0.00         NR/NR   Altair Re III, Floating Rate Note,
                                          6/30/16 (Cat Bond)                        $     900,000
     1,250,000       0.00         NR/NR   Altair Re, Floating Rate Note,
                                          4/30/16 (Cat Bond)                            1,375,250
       950,000                    NR/NR   Pangaea Re, 10/1/15 (d)
                                          (Cat Bond)                                    1,020,994
                                                                                    -------------
                                                                                    $   3,296,244
                                                                                    -------------
                                          Total Insurance                           $  11,791,916
-------------------------------------------------------------------------------------------------
                                          UTILITIES -- 0.2%
                                          Electric Utilities -- 0.2%
       164,000                  BB+/Ba1   PPL Capital Funding, Inc.,
                                          5.9%, 4/30/73                             $   3,406,280
                                                                                    -------------
                                          Total Utilities                           $   3,406,280
-------------------------------------------------------------------------------------------------
                                          TOTAL PREFERRED STOCKS
                                          (Cost $37,656,062)                        $  37,085,984
-------------------------------------------------------------------------------------------------
                                          CONVERTIBLE PREFERRED
                                          STOCKS -- 0.4%
                                          BANKS -- 0.4%
                                          Diversified Banks -- 0.4%
         5,610                BBB+/Baa3   Wells Fargo & Co., 7.5% (Perpetual)       $   6,199,050
                                                                                    -------------
                                          Total Banks                               $   6,199,050
-------------------------------------------------------------------------------------------------
                                          TOTAL CONVERTIBLE
                                          PREFERRED STOCKS
                                          (Cost $5,839,986)                         $   6,199,050
-------------------------------------------------------------------------------------------------


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 21


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          ASSET BACKED SECURITIES -- 8.6%
                                          MATERIALS -- 1.7%
                                          Diversified Metals & Mining -- 0.1%
       618,197                    NR/A1   BCMSC Trust 1998-A, 6.65%, 4/15/28 $            628,654
       324,820                BBB+/Baa1   Lehman ABS Manufactured Housing
                                          Contract Trust 2001-B, 5.873%,
                                          4/15/40                                         344,054
                                                                                    -------------
                                                                                    $     972,708
-------------------------------------------------------------------------------------------------
                                          Precious Metals & Minerals -- 0.2%
       628,918       6.50      BB+/Baa2   ACE Securities Corp. Manufactured
                                          Housing Trust Series 2003-MH1,
                                          Floating Rate Note, 8/15/30 (144A)        $     629,786
     1,231,387       6.50       BBB+/A2   ACE Securities Corp. Manufactured
                                          Housing Trust Series 2003-MH1,
                                          Floating Rate Note, 8/15/30 (144A)            1,280,862
       700,000                   NR/Ba2   Credit-Based Asset Servicing and
                                          Securitization LLC, 5.63098%,
                                          10/25/36 (Step) (144A)                          681,843
       772,021                     A/NR   Mid-State Capital Trust 2010-1,
                                          5.25%, 12/15/45 (144A)                          801,564
                                                                                    -------------
                                                                                    $   3,394,055
-------------------------------------------------------------------------------------------------
                                          Steel -- 1.4%
     1,721,866       0.43      BB+/Baa3   Aegis Asset Backed Securities Trust
                                          2005-5, Floating Rate Note, 12/25/35      $   1,607,824
     1,462,628                  AAA/Aaa   Bayview Financial Mortgage Pass-Through
                                          Trust 2006-A, 5.865%, 2/28/41 (Step)          1,519,441
     1,486,142       0.62        AA/Aa2   Bayview Financial Mortgage Pass-Through
                                          Trust Series 2005-B, Floating Rate
                                          Note, 4/28/39                                 1,454,805
     2,332,812       0.66        A+/Ba3   Bear Stearns Asset Backed Securities I
                                          Trust 2005-FR1, Floating Rate Note,
                                          6/25/35                                       2,283,900
       241,927       0.43        AA+/A1   Citigroup Mortgage Loan Trust
                                          2006-HE1, Floating Rate Note,
                                          1/25/36                                         239,950
     2,965,594       0.56       AA+/Aa2   First NLC Trust 2005-2, Floating Rate
                                          Note, 9/25/35                                 2,894,817
     1,248,744       0.41         B+/B3   GSAA Home Equity Trust 2005-11,
                                          Floating Rate Note, 10/25/35                  1,244,423
        51,289       0.57       AAA/Aaa   Home Equity Asset Trust 2005-5,
                                          Floating Rate Note, 11/25/35                     51,254
       478,325       0.54         A+/A2   Home Equity Asset Trust 2005-7,
                                          Floating Rate Note, 1/25/36                     459,584
     1,670,532       1.37        A+/Aa2   HSBC Home Equity Loan Trust USA
                                          2007-3, Floating Rate Note, 11/20/36          1,657,821


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

22 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Steel -- (continued)
       948,394                  NR/Baa1   Irwin Home Equity Loan Trust 2005-1,
                                          5.32%, 6/25/35 (Step)                     $     925,920
       483,937       0.86        AA+/A2   Irwin Whole Loan Home Equity Trust
                                          2005-C, Floating Rate Note, 3/25/25             444,360
       458,213       0.31       B-/Caa2   Nationstar Home Equity Loan Trust
                                          2007-A, Floating Rate Note, 3/25/37             430,040
       908,073       0.86       AAA/Aaa   New Century Home Equity Loan Trust
                                          2005-1, Floating Rate Note, 3/25/35             884,972
       771,441       1.10        AA+/A1   Terwin Mortgage Trust Series TMTS
                                          2003-8HE, Floating Rate Note,
                                          12/25/34                                        751,144
     2,792,862                   AA-/A2   Terwin Mortgage Trust Series TMTS
                                          2005-16HE, 4.466154%,
                                          9/25/36 (Step)                                2,915,634
                                                                                    -------------
                                                                                    $  19,765,889
                                                                                    -------------
                                          Total Materials                           $  24,132,652
-------------------------------------------------------------------------------------------------
                                          TRANSPORTATION -- 0.1%
                                          Railroads -- 0.1%
     1,611,039                     A/NR   Trinity Rail Leasing LP, 2.266%,
                                          1/15/43 (144A)                            $   1,582,537
                                                                                    -------------
                                          Total Transportation                      $   1,582,537
-------------------------------------------------------------------------------------------------
                                          AUTOMOBILES &
                                          COMPONENTS -- 0.3%
                                          Automobile Manufacturers -- 0.3%
       500,000                   NR/Aa1   AmeriCredit Automobile Receivables
                                          Trust 2011-3, 4.04%, 7/10/17              $     520,644
       800,000                    A+/NR   AmeriCredit Automobile Receivables
                                          Trust 2013-1, 1.57%, 1/8/19                     791,582
         6,822                   AA-/NR   Santander Drive Auto Receivables
                                          Trust 2011-S2, 3.35%,
                                          6/15/17 (144A)                                    6,836
     1,450,000                   AA/Aaa   Santander Drive Auto Receivables
                                          Trust 2012-1, 3.78%, 11/15/17                 1,499,180
       850,000                    A/Aa1   Santander Drive Auto Receivables
                                          Trust 2012-5, 2.7%, 8/15/18                     873,131
                                                                                    -------------
                                                                                    $   3,691,373
                                                                                    -------------
                                          Total Automobiles & Components            $   3,691,373
-------------------------------------------------------------------------------------------------
                                          CONSUMER SERVICES -- 0.2%
                                          Hotels, Resorts & Cruise Lines -- 0.2%
     1,315,767                     A/NR   Westgate Resorts 2012-2 LLC, 3.0%,
                                          1/20/25 (144A)                            $   1,326,043
     1,425,511                    NR/NR   Westgate Resorts 2012-A LLC,
                                          2.25%, 8/20/25 (144A)                         1,427,293


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 23


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Hotels, Resorts & Cruise
                                          Lines -- (continued)
       362,878                     A/NR   Westgate Resorts LLC, 2.5%,
                                          3/20/25 (144A)                            $     364,351
                                                                                    -------------
                                                                                    $   3,117,687
                                                                                    -------------
                                          Total Consumer Services                   $   3,117,687
-------------------------------------------------------------------------------------------------
                                          FOOD & STAPLES RETAILING -- 0.3%
                                          Food Retail -- 0.3%
     3,879,855                  BBB-/NR   CKE Restaurant Holdings, Inc.,
                                          4.474%, 3/20/43 (144A)                    $   3,875,447
                                                                                    -------------
                                          Total Food & Staples Retailing            $   3,875,447
-------------------------------------------------------------------------------------------------
                                          BANKS -- 3.9%
                                          Diversified Banks -- 0.0%+
        48,351       0.25        NR/Aa1   Wells Fargo Home Equity Asset-Backed
                                          Securities 2007-2 Trust, Floating
                                          Rate Note, 4/25/37                        $      48,274
-------------------------------------------------------------------------------------------------
                                          Thrifts & Mortgage Finance -- 3.9%
       452,549       0.34       BB+/Ba3   ACE Securities Corp. Home Equity
                                          Loan Trust Series 2006-ASAP2,
                                          Floating Rate Note, 3/25/36               $     440,600
       263,296                     A/NR   Beacon Container Finance LLC,
                                          3.72%, 9/20/27 (144A)                           263,735
     1,368,320       0.65         A+/NR   Bear Stearns Asset Backed Securities
                                          Trust 2006-SD2, Floating Rate
                                          Note, 6/25/36                                 1,345,424
       301,397       0.90         AA/A3   Carrington Mortgage Loan Trust
                                          Series 2005-NC1, Floating Rate
                                          Note, 2/25/35                                   299,189
       144,677       0.56        AA+/A1   Carrington Mortgage Loan Trust
                                          Series 2005-NC4, Floating Rate
                                          Note, 9/25/35                                   142,368
     2,133,024                   BB-/B1   Citicorp Residential Mortgage Trust
                                          Series 2006-1, 5.939%,
                                          7/25/36 (Step)                                2,126,712
       340,537                    B+/B2   Citicorp Residential Mortgage Trust
                                          Series 2006-2, 5.775%,
                                          9/25/36 (Step)                                  345,874
     2,231,641                    B-/B1   Citicorp Residential Mortgage Trust
                                          Series 2006-3, 5.703%,
                                          11/25/36 (Step)                               2,225,995
     1,421,584                    B-/B2   Citicorp Residential Mortgage Trust
                                          Series 2007-1, 5.892%,
                                          3/25/37 (Step)                                1,398,485
     1,133,830       1.21      BBB-/Ba1   Countrywide Asset-Backed Certificates,
                                          Floating Rate Note, 12/25/34                  1,125,773
     1,935,480       5.07       BB+/Ba3   Countrywide Asset-Backed Certificates,
                                          Floating Rate Note, 2/25/36                   2,004,964


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

24 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Thrifts & Mortgage
                                          Finance -- (continued)
     1,618,750                     A/NR   Cronos Containers Program, Ltd.,
                                          3.81%, 9/18/27 (144A)                     $   1,620,524
       393,536                 BBB/Baa2   Drug Royalty II LP 1, 4.474%,
                                          1/15/25 (144A)                                  400,227
       236,122       4.24      BBB/Baa2   Drug Royalty II LP 1, Floating Rate
                                          Note, 1/15/25 (144A)                            241,151
         4,237       1.16      BBB/Baa1   Ellington Loan Acquisition Trust
                                          2007-1, Floating Rate Note,
                                          5/26/37 (144A)                                    4,236
         2,839       0.96      BBB/Baa1   Ellington Loan Acquisition Trust
                                          2007-1, Floating Rate Note,
                                          5/27/37 (144A)                                    2,838
       121,632       1.24        AAA/NR   First Franklin Mortgage Loan Trust
                                          2004-FF10, Floating Rate
                                          Note, 9/25/34                                   121,333
       700,543                   AAA/NR   First Investors Auto Owner Trust
                                          2012-2, 1.47%, 5/15/18 (144A)                   704,192
     1,200,000                     A/NR   First Investors Auto Owner Trust
                                          2013-1, 2.02%, 1/15/19 (144A)                 1,178,512
     2,599,330                     A/NR   FRS I LLC, 3.08%, 4/15/43 (144A)              2,538,524
     1,444,746                    NR/NR   GMAT Trust, 3.9669%,
                                          8/25/53 (Step)                                1,443,081
       804,334       0.91       AA+/Ba1   GSAMP Trust 2005-HE1, Floating
                                          Rate Note, 12/25/34                             789,147
       241,427       0.81        A/Baa3   GSAMP Trust 2005-HE2, Floating
                                          Rate Note, 3/25/35                              239,183
     1,715,626       1.51     BBB+/Baa3   GSRPM Mortgage Loan Trust 2003-2,
                                          Floating Rate Note, 6/25/33                   1,635,986
     1,095,198       0.46       A+/Baa1   GSRPM Mortgage Loan Trust 2006-2,
                                          Floating Rate Note, 9/25/36 (144A)            1,021,598
     1,150,000                     A/NR   HLSS Servicer Advance Receivables
                                          Backed Notes, 1.6443%,
                                          1/15/44 (144A)                                1,150,000
     1,620,000                    AA/NR   HLSS Servicer Advance Receivables
                                          Backed Notes, 1.7436%,
                                          1/16/46 (144A)                                1,622,106
       800,000                   BBB/NR   HLSS Servicer Advance Receivables
                                          Backed Notes, 2.487%,
                                          1/15/44 (144A)                                  800,240
       224,000                     A/NR   HLSS Servicer Advance Receivables
                                          Backed Notes, 3.96%,
                                          10/15/45 (144A)                                 229,152
     2,687,086                    NR/A2   Horizon Funding Trust 2013-1, 3.0%,
                                          5/15/18 (144A)                                2,687,086
     1,317,973                   BBB/NR   Icon Brands Holdings LLC, 4.229%,
                                          1/25/43 (144A)                                1,310,463


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 25


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Thrifts & Mortgage
                                          Finance -- (continued)
     1,326,000                   NR/Aaa   Leaf Receivables Funding 8 LLC,
                                          1.55%, 11/15/17 (144A)                    $   1,333,028
     2,203,000                   NR/Aa2   Leaf Receivables Funding 8 LLC,
                                          1.92%, 9/15/20 (144A)                         2,210,975
     2,079,439       0.41        A+/Aa1   Lehman Brothers Small Balance
                                          Commercial, Floating Rate Note,
                                          2/25/30 (144A)                                1,916,461
     1,660,149       2.41         A+/A3   Madison Avenue Manufactured
                                          Housing Contract Trust 2002-A,
                                          Floating Rate Note, 3/25/32                   1,658,647
     1,087,000                   AAA/NR   Nationstar Mortgage Advance
                                          Receivables Trust 2013-T2, 1.679%,
                                          6/20/46 (144A)                                1,085,348
       654,721       5.91         AA/A3   Origen Manufactured Housing
                                          Contract Trust 2004-A, Floating
                                          Rate Note, 1/15/35                              696,104
       460,477       5.46       AAA/Aa3   Origen Manufactured Housing
                                          Contract Trust 2004-B, Floating
                                          Rate Note, 11/15/35                             476,210
       250,352                    NR/A2   Oxford Finance Funding Trust
                                          2012-1, 3.9%, 3/15/17 (144A)                    252,856
       526,376       0.87       AAA/Aaa   PFS Financing Corp., Floating Rate
                                          Note, 10/17/16 (144A)                           526,620
       775,712       1.67          A/NR   PFS Financing Corp., Floating Rate
                                          Note, 10/17/16 (144A)                           773,725
     1,384,139       0.41        B/Baa2   RAAC Series 2006-RP2 Trust, Floating
                                          Rate Note, 2/25/37 (144A)                     1,333,575
       262,647       0.35         B+/B2   RAMP Series 2006-NC1 Trust, Floating
                                          Rate Note, 1/25/36                              256,012
        35,819                    AA/NR   Santander Drive Auto Receivables
                                          Trust 2010-1, 1.89%, 5/15/17 (144A)              35,828
     1,472,072       2.64         A+/B2   SASCO Mortgage Pass-Through
                                          Certificates Series 2004-S4, Floating
                                          Rate Note, 12/25/34                           1,476,543
     1,174,526                    AA/NR   SNAAC Auto Receivables Trust 2013-1,
                                          1.14%, 7/16/18 (144A)                         1,173,580
     1,400,000                     A/NR   SNAAC Auto Receivables Trust, 3.11%,
                                          6/15/17 (144A)                                1,413,160
       296,549                     A/NR   STORE Master Funding LLC, 4.16%,
                                          3/20/43 (144A)                                  295,701
     2,057,026                     A/NR   STORE Master Funding LLC, 5.77%,
                                          8/20/42 (144A)                                2,216,034
     1,715,985       0.36       CCC/Ba3   Structured Asset Investment Loan
                                          Trust 2006-1, Floating Rate
                                          Note, 1/25/36                                 1,659,196


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

26 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Thrifts & Mortgage
                                          Finance -- (continued)
     3,236,098       0.38       B-/Baa3   Structured Asset Securities Corp
                                          Mortgage Loan Trust 2006-GEL4,
                                          Floating Rate Note,
                                          10/25/36 (144A)                           $   3,122,064
       364,791                  A+/Baa2   Structured Asset Securities Corp.,
                                          4.77%, 10/25/34 (Step)                          371,618
       814,759                    A+/NR   SVO 2012-A VOI Mortgage LLC,
                                          2.0%, 9/20/29 (144A)                            812,396
                                                                                    -------------
                                                                                    $  56,554,379
                                                                                    -------------
                                          Total Banks                               $  56,602,653
-------------------------------------------------------------------------------------------------
                                          DIVERSIFIED FINANCIALS -- 2.1%
                                          Other Diversified Financial
                                          Services -- 1.0%
     1,900,000                     A/A1   Capital Auto Receivables Asset Trust/
                                          Ally, 1.74%, 10/22/18                     $   1,876,339
     1,105,499                   AA+/NR   DT Auto Owner Trust 2011-1,
                                          4.89%, 1/17/17 (144A)                         1,110,152
       243,811                   AA+/NR   DT Auto Owner Trust 2012-1, 2.26%,
                                          10/16/17 (144A)                                 243,981
       108,512       0.40        AA+/A1   JP Morgan Mortgage Acquisition Corp
                                          2005-OPT2, Floating Rate
                                          Note, 12/25/35                                  108,253
       800,000                    AA/NR   Prestige Auto Receivables Trust 2011-1,
                                          3.9%, 7/16/18 (144A)                            813,983
     2,029,922                    A+/NR   Sierra Timeshare 2012-2 Receivables
                                          Funding LLC, 2.38%, 3/20/29 (144A)            2,050,211
       383,965                    A+/NR   Sierra Timeshare 2012-3 Receivables
                                          Funding LLC, 1.87%, 8/20/29 (144A)              385,279
     2,800,000                     A/NR   Springleaf Funding Trust 2013-A,
                                          2.58%, 9/15/21 (144A)                         2,795,926
       916,667                    A-/NR   Textainer Marine Containers, Ltd.,
                                          4.21%, 4/15/27 (144A)                           923,557
     4,681,803                    NR/NR   Topre Corp. 2013-LTR, 3.47%
                                          11/20/28                                      4,677,458
                                                                                    -------------
                                                                                    $  14,985,139
-------------------------------------------------------------------------------------------------
                                          Specialized Finance -- 0.6%
     1,400,000       1.04       AAA/Aaa   Ally Master Owner Trust, Floating
                                          Rate Note, 1/15/16                        $   1,400,356
     3,944,661                BBB+/Baa1   Domino's Pizza Master Issuer LLC,
                                          5.216%, 1/25/42 (144A)                        4,181,108
     1,659,000       0.61        NR/Aaa   GE Dealer Floorplan Master Note
                                          Trust, Floating Rate Note, 10/20/17           1,660,357
       450,209                    NR/A2   Hercules Capital Funding Trust 2012-1,
                                          3.32%, 12/16/17 (144A)                          451,897


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 27


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Specialized Finance -- (continued)
       801,552                   NR/Aaa   JG Wentworth XXII LLC, 3.82%,
                                          12/15/48 (144A)                           $     833,647
                                                                                    -------------
                                                                                    $   8,527,365
-------------------------------------------------------------------------------------------------
                                          Consumer Finance -- 0.4%
       428,000                  BBB+/NR   American Credit Acceptance
                                          Receivables Trust 2012-2, 4.05%,
                                          2/15/18 (144A)                            $     434,520
     1,087,314                    A+/NR   American Credit Acceptance
                                          Receivables Trust, 1.64%,
                                          11/15/16 (144A)                               1,089,408
     1,131,877                   NR/Aa2   California Republic Auto Receivables
                                          Trust 2012-1, 1.18%, 8/15/17 (144A)           1,130,436
       858,333                     A/NR   Global SC Finance II SRL, 4.11%,
                                          7/19/27 (144A)                                  864,209
       937,285                   NR/Aaa   Santander Drive Auto Receivables
                                          Trust 2011-2, 2.66%, 1/15/16                    942,314
       900,000       0.99       AAA/Aaa   SLM Student Loan Trust 2004-10,
                                          Floating Rate Note, 4/27/26 (144A)              895,640
                                                                                    -------------
                                                                                    $   5,356,527
-------------------------------------------------------------------------------------------------
                                          Asset Management & Custody
                                          Banks -- 0.1%
     1,085,750                     A/NR   Triton Container Finance LLC,
                                          4.21%, 5/14/27 (144A)                     $   1,094,933
-------------------------------------------------------------------------------------------------
                                          Investment Banking &
                                          Brokerage -- 0.0%+
       400,000       1.32        NR/Aa2   Chesapeake Funding LLC, Floating
                                          Rate Note, 5/7/24 (144A)                  $     398,664
                                                                                    -------------
                                          Total Diversified Financials              $  30,362,628
-------------------------------------------------------------------------------------------------
                                          TOTAL ASSET BACKED SECURITIES
                                          (Cost $122,160,497)                       $ 123,364,977
-------------------------------------------------------------------------------------------------
                                          COLLATERALIZED MORTGAGE
                                          OBLIGATIONS -- 19.3%
                                          MATERIALS -- 0.1%
                                          Precious Metals & Minerals -- 0.1%
       552,442       0.86      AA+/Baa3   Credit-Based Asset Servicing and
                                          Securitization LLC, Floating Rate
                                          Note, 5/25/50 (144A)                      $     550,441
                                                                                    -------------
                                          Total Materials                           $     550,441
-------------------------------------------------------------------------------------------------
                                          BANKS -- 13.4%
                                          Diversified Banks -- 0.0%+
       156,962       3.04        NR/Ba3   Banc of America Mortgage 2004-L
                                          Trust, Floating Rate Note, 1/25/35        $     154,930
-------------------------------------------------------------------------------------------------


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

28 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Thrifts & Mortgage Finance -- 13.4%
     1,750,000                    NR/NR   A10 Securitization 2013-1 LLC, 2.4%,
                                          11/15/25 (144A)                           $   1,744,146
     2,794,000                    NR/NR   A10 Term Asset Financing 2013-2
                                          LLC, 2.62%, 11/15/27 (144A)                   2,780,846
       632,096       0.61        CCC/NR   Alternative Loan Trust 2003-14T1,
                                          Floating Rate Note, 8/25/18                     598,171
     1,310,409                  BBB+/NR   Alternative Loan Trust 2003-21T1,
                                          5.75%, 12/25/33                               1,352,371
       536,198                   BB-/B2   Alternative Loan Trust 2003-J1,
                                          4.75%, 10/25/33                                 546,292
       704,184                   CCC/B2   Alternative Loan Trust 2004-28CB,
                                          5.5%, 1/25/35                                   714,682
       382,620                 BBB+/Ba1   Alternative Loan Trust 2004-2CB,
                                          5.125%, 3/25/34                                 384,759
       586,206                  BB+/Ba2   Alternative Loan Trust 2004-4CB,
                                          4.25%, 4/25/34                                  588,564
     3,714,858       0.60       A+/Baa3   Alternative Loan Trust 2005-J4,
                                          Floating Rate Note, 7/25/35                   3,572,037
       790,764                  A+/Baa2   Banc of America Alternative Loan
                                          Trust 2003-2, 5.75%, 4/25/33                    858,660
     1,679,050                  NR/Baa2   Banc of America Alternative Loan
                                          Trust 2003-7, 5.5%, 9/25/33                   1,723,426
       932,469                    NR/B1   Banc of America Alternative Loan
                                          Trust 2004-10, 5.5%, 11/25/19                   943,084
     1,068,975                   NR/Ba3   Banc of America Alternative Loan
                                          Trust 2004-12, 5.5%, 1/25/20                  1,084,902
     1,246,719                    NR/B3   Banc of America Alternative Loan
                                          Trust 2004-2, 5.5%, 3/25/19                   1,277,863
     1,678,157                   NR/Ba2   Banc of America Alternative Loan
                                          Trust 2004-2, 6.0%, 3/25/34                   1,733,831
       839,993                    NR/B2   Banc of America Alternative Loan
                                          Trust 2004-4, 5.25%, 5/25/34                    852,280
     1,522,172                   NR/Ba3   Banc of America Alternative Loan
                                          Trust 2004-6, 5.0%, 7/25/19                   1,549,844
       972,219                  BBB+/NR   Banc of America Funding 2003-3
                                          Trust, 5.5%, 10/25/33                         1,021,469
     1,438,813                   CCC/NR   Banc of America Funding 2005-8
                                          Trust, 5.5%, 1/25/36                          1,409,718
       944,842       0.30         BB-/A   Banc of America Funding 2010-R4
                                          Trust, Floating Rate Note,
                                          8/26/36 (144A)                                  935,567
        24,707       0.26        AAA/NR   Banc of America Funding 2010-R4
                                          Trust, Floating Rate Note,
                                          9/26/46 (144A)                                   24,693
       400,000       1.27        A-/Aaa   Banc of America Large Loan
                                          Trust 2007-BMB1, Floating Rate
                                          Note, 8/15/29 (144A)                            396,870


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 29


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Thrifts & Mortgage
                                          Finance -- (continued)
       710,053       2.77       NR/Baa3   Banc of America Mortgage 2003-H
                                          Trust, Floating Rate Note, 9/25/33        $     711,701
     7,355,951                  NR/Caa2   Bayview Commercial Asset Trust,
                                          3.855%, 9/25/37 (Step) (144A) (c)               441,357
    10,978,485                  NR/Caa2   Bayview Commercial Asset Trust,
                                          4.69517%, 7/25/37 (Step)
                                          (144A) (c)                                      219,570
     1,112,733       3.47         NR/NR   Bayview Opportunity Master Fund IIa
                                          Trust 2012-4NPL, Floating Rate Note,
                                          7/28/32 (144A)                                1,112,399
       579,379       2.98         NR/NR   Bayview Opportunity Master Fund
                                          Trust IIB LP, Floating Rate Note,
                                          1/28/33 (144A)                                  573,238
       313,350       2.50         NR/NR   BCAP LLC 2010-RR10 Trust, Floating
                                          Rate Note, 12/27/34 (144A)                      315,447
     3,320,044       0.76        A+/Ba1   Bear Stearns ALT-A Trust 2004-4,
                                          Floating Rate Note, 6/25/34                   3,110,619
     1,148,292       0.72      AA+/Baa1   Bear Stearns ALT-A Trust 2005-1,
                                          Floating Rate Note, 1/25/35                   1,122,083
     1,124,337       2.35      AA+/Baa2   Bear Stearns ARM Trust 2003-5,
                                          Floating Rate Note, 8/25/33                   1,102,579
     1,000,000       5.21        NR/Ba1   Bear Stearns Commercial Mortgage
                                          Securities Trust 2005-PWR7,
                                          Floating Rate Note, 2/11/41                   1,010,490
     2,072,826       0.87      AA+/Baa3   Bella Vista Mortgage Trust 2004-1,
                                          Floating Rate Note, 11/20/34                  1,956,399
       155,185                  A+/Baa1   Chase Mortgage Finance Trust Series
                                          2003-S11, 5.0%, 10/25/33                        157,740
       658,952       2.58        A+/Ba1   CHL Mortgage Pass-Through Trust
                                          2003-56, Floating Rate Note, 12/25/33           655,045
       660,920                  NR/Baa3   CHL Mortgage Pass-Through Trust
                                          2004-9, 5.25%, 6/25/34                          667,359
     1,682,691       0.34        AA/Aaa   Citigroup Commercial Mortgage Trust
                                          2007-FL3, Floating Rate Note,
                                          4/15/22 (144A)                                1,675,193
     1,917,589       1.17        AA+/NR   Citigroup Mortgage Loan Trust 2010-7,
                                          Floating Rate Note, 9/25/37 (144A)            1,876,054
     1,732,465       2.30       BBB-/NR   Citigroup Mortgage Loan Trust, Inc.,
                                          Floating Rate Note, 8/25/34                   1,743,288
     1,000,000       4.65        AA-/A1   City Center Trust 2011-CCHP, Floating
                                          Rate Note, 7/15/28 (144A)                     1,009,617
       623,626       0.60       BBB+/A2   CNL Commercial Mortgage Loan Trust
                                          2003-2, Floating Rate Note,
                                          10/25/30 (144A)                                 531,270
     1,627,162       0.30        AA-/A1   COMM 2006-FL12 Mortgage Trust,
                                          Floating Rate Note, 12/15/20 (144A)           1,606,905


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

30 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Thrifts & Mortgage
                                          Finance -- (continued)
     1,118,656       0.35         A+/A1   COMM 2007-FL14 Mortgage Trust,
                                          Floating Rate Note, 6/15/22 (144A)        $   1,106,071
       850,000                   NR/Aaa   COMM 2012-CCRE2 Mortgage Trust,
                                          3.147%, 8/15/45                                 820,870
       450,000                   NR/Aaa   COMM 2012-CCRE2 Mortgage Trust,
                                          3.791%, 8/15/45                                 443,703
       915,000                  AAA/Aaa   COMM 2012-CCRE4 Mortgage Trust,
                                          2.436%, 10/15/45                                880,844
     4,000,000                   NR/Aaa   COMM 2012-LC4 Mortgage Trust,
                                          4.063%, 12/10/44                              4,049,896
     1,900,000                  AAA/Aaa   COMM 2013-LC6 Mortgage Trust,
                                          2.941%, 1/10/46                               1,780,095
     3,907,360       2.11        AAA/NR   Commercial Mortgage Pass Through
                                          Certificates, Floating Rate Note,
                                          11/17/26 (144A)                               3,912,385
     1,100,000       1.27        AA-/NR   Extended Stay America Trust
                                          2013-ESH, Floating Rate Note,
                                          12/5/31 (144A)                                1,100,742
       322,966       5.25        NR/Ba1   First Horizon Mortgage Pass-Through
                                          Trust 2004-AR5, Floating Rate
                                          Note, 10/25/34                                  316,343
       475,859       2.65        BB-/B1   First Horizon Mortgage Pass-Through
                                          Trust 2005-AR1, Floating Rate
                                          Note, 4/25/35                                   473,313
       777,435       0.34         A/Aa3   GE Business Loan Trust 2007-1,
                                          Floating Rate Note, 4/16/35 (144A)              703,062
       356,905                   NR/Aaa   GE Capital Commercial Mortgage
                                          Corp., 4.893%, 3/10/40                          357,279
     1,135,539                  BB/Caa3   Global Mortgage Securitization, Ltd.,
                                          5.25%, 4/25/32 (144A)                         1,115,283
     3,375,000                   AAA/NR   GMAC Commercial Mortgage
                                          Securities Inc Series 2004-C3 Trust,
                                          4.864%, 12/10/41                              3,464,012
     1,250,000                   NR/Aaa   GS Mortgage Securities Corp. II,
                                          3.377%, 5/10/45                               1,240,919
     1,000,000                   AA-/NR   GS Mortgage Securities Corp. II,
                                          3.682%, 2/10/46 (144A)                          940,626
       900,000                   NR/Aaa   GS Mortgage Securities Corp. II,
                                          5.56%, 11/10/39                                 986,834
     1,550,000       1.92         NR/A3   GS Mortgage Securities Corp. II,
                                          Floating Rate Note, 11/8/29 (144A)            1,540,440
     1,620,915       2.35         A+/NR   GSR Mortgage Loan Trust 2003-9,
                                          Floating Rate Note, 8/25/33                   1,612,034
       256,557       5.71          B/NR   GSR Mortgage Loan Trust 2004-3F,
                                          Floating Rate Note, 2/25/34                     228,217


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 31


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Thrifts & Mortgage
                                          Finance -- (continued)
     2,010,193       2.82         A+/B1   GSR Mortgage Loan Trust 2004-7,
                                          Floating Rate Note, 6/25/34               $   1,956,059
       370,821       2.62       BBB+/NR   GSR Mortgage Loan Trust 2005-AR1,
                                          Floating Rate Note, 1/25/35                     370,273
     2,718,997       0.51       AA+/Aa3   Homestar Mortgage Acceptance Corp.,
                                          Floating Rate Note, 6/25/34                   2,631,413
       680,714       0.88      BBB/Baa2   Impac CMB Trust Series 2004-5,
                                          Floating Rate Note, 10/25/34                    645,474
       505,791       0.96       BB+/Ba1   Impac CMB Trust Series 2004-6,
                                          Floating Rate Note, 10/25/34                    478,899
       926,967       0.94      BBB/Baa1   Impac CMB Trust Series 2004-6,
                                          Floating Rate Note, 10/25/34                    865,144
     2,556,029       0.90       BBB+/A3   Impac CMB Trust Series 2004-7,
                                          Floating Rate Note, 11/25/34                  2,406,956
       797,251       0.92         B/Ba3   Impac CMB Trust Series 2004-9,
                                          Floating Rate Note, 1/25/35                     697,881
     2,214,401       0.96       AAA/Aaa   Impac Secured Assets CMN Owner
                                          Trust, Floating Rate Note, 11/25/34           2,126,956
       537,566       0.51       AAA/Aaa   Impac Secured Assets Trust 2006-2,
                                          Floating Rate Note, 8/25/36                     521,232
     2,800,000       2.54          A/A2   JP Morgan Chase Commercial
                                          Mortgage Securities Corp., Floating
                                          Rate Note, 10/15/25 (144A)                    2,809,688
       661,881       0.32        AA/Aa3   JP Morgan Chase Commercial
                                          Mortgage Securities Trust 2006-LDP9,
                                          Floating Rate Note, 5/15/47                     661,665
     1,600,000                   AAA/NR   JP Morgan Chase Commercial
                                          Mortgage Securities Trust 2010-C2,
                                          3.6159%, 11/15/43 (144A)                      1,684,242
     1,350,000                   NR/Aaa   JP Morgan Chase Commercial
                                          Mortgage Securities Trust 2011-C5,
                                          4.1712%, 8/15/46                              1,417,682
       900,000       3.98         AA/NR   JP Morgan Chase Commercial
                                          Mortgage Securities Trust 2012-C8,
                                          Floating Rate Note, 10/15/45 (144A)             873,644
     1,368,000       3.01        AA-/NR   JP Morgan Chase Commercial
                                          Mortgage Securities Trust 2013-ALC,
                                          Floating Rate Note, 7/17/26 (144A)            1,381,618
     1,500,000       1.97         A-/NR   JP Morgan Chase Commercial
                                          Mortgage Securities Trust 2013-FL3,
                                          Floating Rate Note, 4/15/28 (144A)            1,492,402
     1,368,761       2.02       A+/Baa1   JP Morgan Mortgage Trust 2003-A1,
                                          Floating Rate Note, 10/25/33                  1,353,456
     1,127,446       2.49       A+/Baa1   JP Morgan Mortgage Trust 2003-A1,
                                          Floating Rate Note, 10/25/33                  1,109,462
     2,091,874       2.49      AA+/Baa3   JP Morgan Mortgage Trust 2004-A1,
                                          Floating Rate Note, 2/25/34                   2,103,068


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

32 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Thrifts & Mortgage
                                          Finance -- (continued)
     1,005,968       3.06      AA+/Baa1   JP Morgan Mortgage Trust 2004-A1,
                                          Floating Rate Note, 2/25/34               $     998,779
       267,093       2.84         A+/NR   JP Morgan Mortgage Trust 2004-A2,
                                          Floating Rate Note, 5/25/34                     265,655
     1,211,756       2.30      AA+/Baa2   JP Morgan Mortgage Trust 2004-A5,
                                          Floating Rate Note, 12/25/34                  1,200,962
       416,282       2.26      BBB+/Ba1   JP Morgan Mortgage Trust 2005-A4,
                                          Floating Rate Note, 7/25/35                     412,243
       914,901       3.50        AAA/NR   JP Morgan Mortgage Trust 2013-2,
                                          Floating Rate Note, 5/25/43 (144A)              881,481
       572,754       5.62       BBB+/NR   LB-UBS Commercial Mortgage Trust
                                          2002-C4, Floating Rate Note,
                                          10/15/35 (144A)                                 575,218
       400,819                  AAA/Aaa   LB-UBS Commercial Mortgage Trust
                                          2004-C1, 4.568%, 1/15/31                        409,961
        79,775       1.07      BBB+/Aa2   Lehman Brothers Floating Rate
                                          Commercial Mortgage Trust 2007-LLF C5,
                                          Floating Rate Note, 6/15/22 (144A)               79,555
           962       1.01       AAA/Aaa   Lehman Brothers Small Balance
                                          Commercial Mortgage Trust 2007-3
                                          Class 1A2, Floating Rate Note,
                                          10/25/37 (144A)                                     961
       359,480       1.11        A+/Aa1   Lehman Brothers Small Balance
                                          Commercial Mortgage Trust 2007-3
                                          Class 1A4, Floating Rate Note,
                                          10/25/37 (144A)                                 356,784
       589,058       0.41        A+/Aa1   Lehman Brothers Small Balance
                                          Commercial, Floating Rate Note,
                                          9/25/30 (144A)                                  522,728
     1,138,642       5.28         B-/B3   MASTR Adjustable Rate Mortgages
                                          Trust, Floating Rate Note, 1/25/35            1,143,639
     1,002,857                   BB+/NR   MASTR Alternative Loan Trust 2004-10,
                                          5.5%, 10/25/19                                1,028,410
        81,226                   AAA/NR   MASTR Alternative Loan Trust 2004-13,
                                          4.5%, 1/25/15                                    81,244
       278,967                    B+/NR   MASTR Alternative Loan Trust 2004-13,
                                          5.5%, 1/25/35                                   284,612
     2,312,669                    B-/NR   MASTR Alternative Loan Trust 2004-6,
                                          6.0%, 7/25/34                                 2,373,286
     1,651,492                    A+/NR   MASTR Alternative Loan Trust 2005-1,
                                          5.5%, 2/25/35                                 1,652,683
       849,766       6.60         A-/NR   MASTR Seasoned Securitization Trust
                                          2005-1, Floating Rate Note, 9/25/32             888,713
       308,051       2.38        BBB/B1   Merrill Lynch Mortgage Investors Trust
                                          Series 2005-2, Floating Rate
                                          Note, 10/25/35                                  307,840


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 33


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Thrifts & Mortgage
                                          Finance -- (continued)
     1,228,893       0.62       A+/Baa1   Merrill Lynch Mortgage Investors Trust
                                          Series MLCC 2004-A, Floating Rate
                                          Note, 4/25/29                             $   1,151,847
     3,499,957       0.44       A+/Baa2   Morgan Stanley Mortgage Loan Trust
                                          2005-6AR, Floating Rate Note,
                                          11/25/35                                      3,383,720
     2,950,000                    NR/NR   Morgan Stanley Re-REMIC Trust
                                          2010-R9, 5.0%, 11/26/36 (144A)                2,980,201
     2,963,682       0.94      AA+/Baa1   MortgageIT Trust 2004-1, Floating
                                          Rate Note, 11/25/34                           2,808,771
     2,554,644       1.37       AAA/Aaa   NorthStar 2012-1 Mortgage Trust,
                                          Floating Rate Note, 8/25/29 (144A)            2,555,600
       674,771       0.41        BB+/B2   Opteum Mortgage Acceptance Corp
                                          Asset Backed Pass-Through
                                          Certificates 2005-5, Floating Rate
                                          Note, 12/25/35                                  659,266
       577,110                    NR/A2   PHH Mortgage Capital LLC, 6.6%,
                                          12/25/27 (Step) (144A)                          588,455
       459,507                 BB+/Caa1   RAAC Series 2004-SP2 Trust, 6.0%,
                                          1/25/32                                         468,256
       639,319       1.57        B-/Ba3   RESI Finance LP, Floating Rate Note,
                                          9/10/35 (144A)                                  568,290
       390,246                    B-/NR   Residential Asset Securitization Trust
                                          2004-A10, 5.5%, 2/25/35                         396,632
       588,911                   BBB/NR   Residential Asset Securitization Trust
                                          2004-A8, 5.25%, 11/25/34                        600,320
     1,566,983                     B/NR   Residential Asset Securitization Trust
                                          2004-A9, 5.75%, 12/25/34                      1,615,518
     1,362,220                   CCC/NR   Residential Asset Securitization Trust
                                          2005-A9, 5.5%, 7/25/35                        1,323,824
     1,066,854                    NR/B3   RFMSI Series 2005-S5 Trust, 5.25%,
                                          7/25/35                                       1,076,230
     3,155,453       0.83       AA+/Ba1   Sequoia Mortgage Trust 2003-2,
                                          Floating Rate Note, 6/20/33                   3,037,884
     1,449,334       0.79      AA+/Baa3   Sequoia Mortgage Trust 2003-5,
                                          Floating Rate Note, 9/20/33                   1,422,972
     1,238,960       0.64       AA/Baa3   Sequoia Mortgage Trust 2004-12,
                                          Floating Rate Note, 1/20/35                   1,171,163
     1,468,474       0.39      BBB+/Ba3   Sequoia Mortgage Trust 2005-2,
                                          Floating Rate Note, 3/20/35                   1,333,069
       801,370       3.00        AAA/NR   Sequoia Mortgage Trust 2013-7,
                                          Floating Rate Note, 6/25/43                     736,764
     1,463,228       2.25        NR/Aaa   Sequoia Mortgage Trust 2013-8,
                                          Floating Rate Note, 6/25/43                   1,383,824
       861,377       3.00        NR/Aaa   Sequoia Mortgage Trust 2013-8,
                                          Floating Rate Note, 6/25/43                     791,833


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

34 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Thrifts & Mortgage
                                          Finance -- (continued)
       195,544                  NR/Baa3   SMA Issuer I LLC, 3.5%,
                                          8/20/25 (144A)                            $     195,968
     2,152,211       2.22        AAA/NR   Springleaf Mortgage Loan Trust
                                          2012-2, Floating Rate Note,
                                          10/25/57 (144A)                               2,192,511
       750,000       3.79         A-/NR   Springleaf Mortgage Loan Trust,
                                          Floating Rate Note, 6/25/58 (144A)              712,813
     4,117,544       0.85      AA+/Baa1   Structured Asset Mortgage
                                          Investments II Trust 2004-AR8,
                                          Floating Rate Note, 5/19/35                   3,995,875
     1,160,447       0.91        A+/Ba1   Structured Asset Mortgage
                                          Investments Trust 2003-AR2,
                                          Floating Rate Note, 12/19/33                  1,092,163
       948,361       2.65       A+/Baa3   Structured Asset Securities Corp.
                                          Mortgage Certificates Series
                                          2003-31A, Floating Rate Note,
                                          10/25/33                                        953,281
       945,182       0.81         NR/NR   Structured Asset Securities Corp.
                                          Reverse Mortgage Loan Trust
                                          2002-RM1, Floating Rate Note,
                                          10/25/37 (144A)                                 931,595
       918,704       2.72       NR/Baa2   Thornburg Mortgage Securities
                                          Trust 2003-3, Floating Rate
                                          Note, 6/25/43                                   909,003
     3,510,417       0.90     BBB+/Baa3   Thornburg Mortgage Securities
                                          Trust 2004-3, Floating Rate
                                          Note, 9/25/44                                 3,359,750
     1,310,144       0.74     BBB+/Baa1   Thornburg Mortgage Securities
                                          Trust 2004-4, Floating Rate
                                          Note, 12/25/44                                1,198,497
       774,078       4.00       AAA/Ba1   Thornburg Mortgage Securities
                                          Trust Class II4A, Floating Rate
                                          Note, 3/25/44                                   768,942
     4,470,000                  AAA/Aa1   TimberStar Trust 1, 5.668%,
                                          10/15/36 (144A)                               4,877,731
     1,435,000                   AA/Aa3   TimberStar Trust 1, 5.7467%,
                                          10/15/36 (144A)                               1,556,781
     3,787,250                  AAA/Aaa   Wachovia Bank Commercial
                                          Mortgage Trust Series 2004-C15,
                                          4.803%, 10/15/41                              3,873,001
       178,778       2.21        NR/Ba3   WaMu Mortgage Pass-Through
                                          Certificates Series 2002-AR2 Trust,
                                          Floating Rate Note, 2/27/34                     144,859
     2,635,441       2.44       A+/Baa1   WaMu Mortgage Pass-Through
                                          Certificates Series 2003-AR6 Trust,
                                          Floating Rate Note, 6/25/33                   2,669,272


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 35


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Thrifts & Mortgage
                                          Finance -- (continued)
       136,690       2.42        A+/Ba3   WaMu Mortgage Pass-Through
                                          Certificates Series 2004-AR9 Trust,
                                          Floating Rate Note, 8/25/34               $     135,533
     2,270,283       2.49        BBB/NR   WaMu Mortgage Pass-Through
                                          Certificates Series 2005-AR3 Trust,
                                          Floating Rate Note, 3/25/35                   2,251,067
       167,014       2.41         B-/NR   WaMu Mortgage Pass-Through
                                          Certificates Series 2005-AR7 Trust,
                                          Floating Rate Note, 8/25/35                     163,746
     3,743,082       2.41       BBB+/NR   WaMu Mortgage Pass-Through
                                          Certificates, Floating Rate Note,
                                          1/25/35                                       3,722,458
     1,233,457       0.57        AA+/A1   Wells Fargo Alternative Loan 2005-2
                                          Trust, Floating Rate Note, 10/25/35           1,207,290
     1,927,000                   NR/Aaa   Wells Fargo Commercial Mortgage
                                          Trust 2012-LC5, 3.539%, 10/15/45              1,863,735
     3,092,746                   NR/Aaa   Wells Fargo Commercial Mortgage
                                          Trust, 3.349%, 11/15/43 (144A)                3,220,099
       660,349       2.50         NR/NR   Wells Fargo Mortgage Backed
                                          Securities 2003-B Trust, Floating
                                          Rate Note, 2/25/33                              650,681
       684,419       2.49      AA+/Baa1   Wells Fargo Mortgage Backed
                                          Securities 2003-L Trust, Floating
                                          Rate Note, 11/25/33                             678,060
       327,994       2.53       A+/Baa1   Wells Fargo Mortgage Backed
                                          Securities 2003-L Trust, Floating
                                          Rate Note, 11/25/33                             321,730
       414,483       2.63      AA+/Baa1   Wells Fargo Mortgage Backed
                                          Securities 2004-V Trust, Floating
                                          Rate Note, 10/25/34                             421,338
       334,004                 AA+/Baa1   Wells Fargo Mortgage Backed
                                          Securities 2006-16 Trust, 5.0%,
                                          11/25/36                                        343,976
     1,399,428       4.93      BBB+/Ba3   Wells Fargo Mortgage Backed
                                          Securities Trust, Floating Rate
                                          Note, 8/25/34                                 1,422,071
       350,000       5.39         NR/A2   WF-RBS Commercial Mortgage
                                          Trust 2011-C2, Floating Rate Note,
                                          2/15/44 (144A)                                  369,920
                                                                                    -------------
                                                                                    $ 192,075,549
                                                                                    -------------
                                          Total Banks                               $ 192,230,479
-------------------------------------------------------------------------------------------------
                                          DIVERSIFIED FINANCIALS -- 3.1%
                                          Other Diversified Financial
                                          Services -- 2.9%
     1,390,026       2.77         A-/NR   Banc of America Mortgage 2003-F
                                          Trust, Floating Rate Note, 7/25/33        $   1,411,314


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

36 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Other Diversified Financial
                                          Services -- (continued)
       896,110       2.80        NR/Ba2   Banc of America Mortgage 2003-I Trust,
                                          Floating Rate Note, 10/25/33              $     896,035
       303,596       2.70        AA+/NR   Banc of America Mortgage 2004-E
                                          Trust, Floating Rate Note, 6/25/34              304,463
       594,803       5.09       BBB+/NR   Banc of America Mortgage 2005-H
                                          Trust, Floating Rate Note, 9/25/35              588,114
     1,228,790                    A+/NR   Banc of America Mortgage Trust
                                          2004-11, 5.75%, 1/25/35                       1,260,402
       131,989                    B-/NR   Banc of America Mortgage Trust
                                          2004-7, 4.5%, 8/25/19                           134,191
     1,235,297                    A+/NR   Banc of America Mortgage Trust
                                          2004-9, 5.5%, 11/25/34                        1,275,709
       484,939                    NR/B1   Citicorp Mortgage Securities Trust
                                          Series 2006-1, 5.0%, 2/25/36                    499,903
     2,714,042                  NR/Baa1   Credit Suisse Commercial Mortgage
                                          Trust Series 2007-C1, 5.361%, 2/15/40         2,893,109
       711,481       0.29        AA/Aaa   Credit Suisse First Boston Mortgage
                                          Securities Corp Series 2007-TFL1,
                                          Floating Rate Note, 2/15/22 (144A)              706,714
     1,900,000       5.42        NR/Aa2   DBUBS 2011-LC3 Mortgage Trust,
                                          Floating Rate Note, 8/10/44 (144A)            2,077,215
     1,895,000       1.47        AA-/NR   Del Coronado Trust 2013-DEL,
                                          Floating Rate Note, 3/15/26 (144A)            1,890,450
     1,556,990       0.42        AA/Aa3   GE Business Loan Trust 2005-1,
                                          Floating Rate Note, 6/15/33 (144A)            1,458,869
     1,262,355       0.36      BB+/Baa2   Impac Secured Assets Trust 2006-5,
                                          Floating Rate Note, 12/25/36                  1,151,446
     1,177,333                  B+/Baa3   JP Morgan Mortgage Trust 2004-S1,
                                          5.0%, 9/25/34                                 1,212,049
     2,004,654                   B-/Ba2   JP Morgan Mortgage Trust 2004-S1,
                                          6.0%, 9/25/34                                 2,062,362
       565,692       3.00         NR/NR   La Hipotecaria Panamanian
                                          Mortgage Trust 2010-1, Floating
                                          Rate Note, 9/8/39 (144A)                        589,999
     1,395,000       5.43         NR/A2   LSTAR Commercial Mortgage Trust,
                                          Floating Rate Note, 6/25/43 (144A)            1,470,451
     3,479,994                   AAA/NR   Morgan Stanley Capital I Trust
                                          2004-HQ4, 4.97%, 4/14/40                      3,522,530
     1,000,000                  BBB-/NR   Morgan Stanley Capital I Trust
                                          2007-HQ13, 5.569%, 12/15/44                   1,078,629
       663,795       0.27       AA+/Aaa   Morgan Stanley Capital I, Inc.,
                                          Floating Rate Note, 10/15/20 (144A)             651,169
     5,102,000       0.30        A+/Aa1   Morgan Stanley Capital I, Inc.,
                                          Floating Rate Note, 10/15/20 (144A)           4,975,322


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 37


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Other Diversified Financial
                                          Services -- (continued)
     1,081,602       3.75        AAA/NR   Nationstar Mortgage Loan Trust
                                          2013-A, Floating Rate Note,
                                          12/25/52 (144A)                           $   1,110,662
       640,517                   NR/Ba1   RALI Series 2003-QS14 Trust,
                                          5.0%, 7/25/18                                   652,441
     2,666,400                    NR/B1   RALI Series 2004-QS13 Trust,
                                          5.0%, 9/25/19                                 2,734,452
     1,037,197                    NR/B3   RALI Series 2004-QS16 Trust,
                                          5.5%, 12/25/34                                1,064,882
     1,493,845                   NR/Ba2   RALI Series 2004-QS3 Trust,
                                          5.0%, 3/25/19                                 1,542,336
       687,524       2.37       BBB-/B3   Structured Adjustable Rate Mortgage
                                          Loan Trust, Floating Rate Note,
                                          1/25/35                                         667,311
       506,617       5.21      BBB+/Ba2   Structured Adjustable Rate Mortgage
                                          Loan Trust, Floating Rate Note,
                                          11/25/34                                        497,250
       351,974                    NR/NR   VOLT XV LLC, 3.22162%, 5/27/53
                                          (Step) (144A)                                   350,654
                                                                                    -------------
                                                                                    $  40,730,433
-------------------------------------------------------------------------------------------------
                                          Specialized Finance -- 0.0%+
       270,267                 BB+/Baa2   Spirit Master Funding LLC, 5.74%,
                                          3/20/25 (144A)                            $     266,913
-------------------------------------------------------------------------------------------------
                                          Consumer Finance -- 0.1%
     1,304,794       3.36       AA/Baa3   GMACM Mortgage Loan Trust
                                          2003-AR1, Floating Rate Note,
                                          10/19/33                                  $   1,328,622
-------------------------------------------------------------------------------------------------
                                          Asset Management & Custody
                                          Banks -- 0.0%+
       419,681       2.59         NR/NR   Jefferies & Co., Inc., Floating Rate
                                          Note, 5/26/37 (144A)                      $     419,987
-------------------------------------------------------------------------------------------------
                                          Investment Banking &
                                          Brokerage -- 0.1%
     1,198,702       4.88        AAA/NR   Banc of America Merrill Lynch
                                          Commercial Mortgage, Inc., Floating
                                          Rate Note, 7/10/42                        $   1,211,786
       617,503       7.41      BBB+/Aaa   Bear Stearns Commercial Mortgage
                                          Securities Trust 2002-TOP6, Floating
                                          Rate Note, 10/15/36 (144A)                      627,222
                                                                                    -------------
                                                                                    $   1,839,008
                                                                                    -------------
                                          Total Diversified Financials              $  44,584,963
-------------------------------------------------------------------------------------------------


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

38 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          REAL ESTATE -- 1.7%
                                          Diversified REIT -- 0.0%+
       200,000                    A+/NR   Spirit Master Funding LLC,
                                          3.8868%, 12/20/43                         $     200,250
-------------------------------------------------------------------------------------------------
                                          Mortgage REIT -- 1.6%
       285,140                    B-/NR   Credit Suisse First Boston Mortgage
                                          Securities Corp., 5.5%, 6/25/33           $     284,506
       611,307       2.55      BBB+/Ba1   Credit Suisse First Boston Mortgage
                                          Securities Corp., Floating Rate
                                          Note, 11/25/33                                  602,975
       401,270       1.51        AA+/A3   Credit Suisse First Boston Mortgage
                                          Securities Corp., Floating Rate
                                          Note, 12/25/33                                  401,172
     1,929,232       5.01        NR/Aaa   Credit Suisse First Boston Mortgage
                                          Securities Corp., Floating Rate
                                          Note, 2/15/38                                 1,984,427
       584,909       2.57       BBB+/B1   Credit Suisse First Boston Mortgage
                                          Securities Corp., Floating Rate
                                          Note, 6/25/34                                   581,389
     3,250,000       6.45        D/Caa2   Credit Suisse First Boston Mortgage
                                          Securities Corp., Floating Rate
                                          Note, 9/15/34 (144A)                          3,243,468
     1,250,000       4.16       NR/Baa2   Federal Home Loan Mortgage Corp.,
                                          Floating Rate Note, 9/25/44 (144A)            1,206,025
       850,000       5.44         NR/A3   FREMF Mortgage Trust 2010-K7,
                                          Floating Rate Note, 4/25/20 (144A)              906,660
       600,000       5.24         A+/NR   FREMF Mortgage Trust 2010-K8,
                                          Floating Rate Note, 9/25/43 (144A)              631,822
       890,000       5.19         NR/NR   FREMF Mortgage Trust 2010-K9
                                          REMICS, Floating Rate Note,
                                          9/25/45 (144A)                                  932,823
     1,500,000       4.62         NR/NR   FREMF Mortgage Trust 2011-K10,
                                          Floating Rate Note, 11/25/49 (144A)           1,517,858
     1,750,000       4.77         NR/A3   FREMF Mortgage Trust 2011-K702,
                                          Floating Rate Note, 4/25/44 (144A)            1,848,406
     1,250,000       4.89         NR/A3   FREMF Mortgage Trust 2011-K703,
                                          Floating Rate Note, 7/25/44 (144A)            1,323,456
       900,000       3.20       A-/Baa2   FREMF Mortgage Trust 2013-K502,
                                          Floating Rate Note, 3/25/45 (144A)              858,110
       650,000       3.49         NR/A2   FREMF Mortgage Trust Class B, Floating
                                          Rate Note, 11/25/46 (144A)                      670,036
       858,000       3.82         NR/NR   FREMF Mortgage Trust Class B, Floating
                                          Rate Note, 6/25/47 (144A)                       848,257
     5,000,000       4.29         A-/NR   FREMF Mortgage Trust Class B, Floating
                                          Rate Note, 7/25/48 (144A)                     5,191,295
                                                                                    -------------
                                                                                    $  23,032,685
-------------------------------------------------------------------------------------------------


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 39


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Diversified Real Estate
                                          Activities -- 0.1%
       724,614       0.65      AA+/Baa1   Mellon Residential Funding Corp.
                                          Mortgage Pass-Through Trust Series
                                          2000 TBC2, Floating Rate Note,
                                          6/15/30                                   $     699,714
       934,584       0.61      AA+/Baa1   Mellon Residential Funding Corp.
                                          Mortgage Pass-Through Trust Series
                                          2000-TBC3, Floating Rate Note,
                                          12/15/30                                        912,324
                                                                                    -------------
                                                                                    $   1,612,038
                                                                                    -------------
                                          Total Real Estate                         $  24,844,973
-------------------------------------------------------------------------------------------------
                                          TELECOMMUNICATION
                                          SERVICES -- 0.2%
                                          Wireless Telecommunication
                                          Services -- 0.2%
     3,015,000                    NR/A2   Crown Castle Towers LLC, 4.883%,
                                          8/15/20 (144A)                            $   3,163,112
                                                                                    -------------
                                          Total Telecommunication Services          $   3,163,112
-------------------------------------------------------------------------------------------------
                                          GOVERNMENT -- 0.8%
                                          Government -- 0.8%
       999,400                    NR/NR   Federal Home Loan Mortgage Corp.
                                          REMICS, 5.0%, 6/15/33                     $   1,015,091
       488,136                    NR/NR   Federal Home Loan Mortgage Corp.
                                          REMICS, 5.0%, 6/15/34                           498,005
         5,087                    NR/NR   Federal National Mortgage Association
                                          REMICS, 10.3%, 4/25/19                            5,771
     1,000,000                    NR/NR   Federal National Mortgage Association
                                          REMICS, 4.5%, 6/25/29                         1,081,310
       140,829                    NR/NR   Federal National Mortgage Association
                                          REMICS, 5.0%, 3/25/24                           141,070
     1,828,246                    NR/NR   Federal National Mortgage Association
                                          REMICS, 5.0%, 7/25/33                         1,884,818
       168,716                    NR/NR   Federal National Mortgage Association
                                          REMICS, 5.0%, 9/25/39                           172,729
     1,865,752                    NR/NR   Government National Mortgage
                                          Association, 3.0%, 4/20/41                    1,919,801
       375,000                    NR/NR   Government National Mortgage
                                          Association, 4.973%, 4/16/42                    404,013
       696,309                    NR/NR   Government National Mortgage
                                          Association, 5.25%, 8/16/35                     769,041
    11,700,082       1.03         NR/NR   Government National Mortgage
                                          Association, Floating Rate
                                          Note, 2/16/53 (c)                               949,380
     8,082,700       1.05         NR/NR   Government National Mortgage
                                          Association, Floating Rate
                                          Note, 3/16/53 (c)                               631,065


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

40 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Government -- (continued)
    13,569,635       1.08         NR/NR   Government National Mortgage
                                          Association, Floating Rate
                                          Note, 8/16/52 (c)                         $     964,068
    12,624,601       1.07         NR/NR   Government National Mortgage
                                          Association, Floating Rate
                                          Note, 9/16/52 (c)                             1,058,535
                                                                                    -------------
                                                                                    $  11,494,697
                                                                                    -------------
                                          Total Government                          $  11,494,697
-------------------------------------------------------------------------------------------------
                                          TOTAL COLLATERALIZED
                                          MORTGAGE OBLIGATIONS
                                          (Cost $274,387,054)                       $ 276,868,665
-------------------------------------------------------------------------------------------------
                                          CORPORATE BONDS -- 37.4%
                                          ENERGY -- 2.9%
                                          Oil & Gas Drilling -- 0.1%
     1,025,000                BBB+/Baa1   Pride International, Inc., 6.875%,
                                          8/15/20                                   $   1,227,311
-------------------------------------------------------------------------------------------------
                                          Oil & Gas Equipment &
                                          Services -- 0.4%
     1,300,000                     A/A2   Halliburton Co., 7.6%,
                                          8/15/96 (144A)                            $   1,721,658
       125,000                BBB-/Baa2   Weatherford International, Ltd.
                                          Bermuda, 5.95%, 4/15/42                         125,242
     2,815,000                BBB-/Baa2   Weatherford International, Ltd.
                                          Bermuda, 9.625%, 3/1/19                       3,616,892
                                                                                    -------------
                                                                                    $   5,463,792
-------------------------------------------------------------------------------------------------
                                          Oil & Gas Exploration &
                                          Production -- 0.7%
     1,800,000                     B/B2   EP Energy LLC, 9.375%, 5/1/20             $   2,076,750
       901,000                 BBB/Baa1   Marathon Oil Corp., 5.9%, 3/15/18             1,025,230
     1,400,000                 BBB-/Ba1   Newfield Exploration Co.,
                                          5.625%, 7/1/24                                1,393,000
       829,785                    A/Aa3   Ras Laffan Liquefied Natural Gas
                                          Co., Ltd. III, 5.832%, 9/30/16 (144A)           881,647
     1,000,000                 BBB/Baa1   Rosneft Finance SA, 6.625%,
                                          3/20/17 (144A)                                1,105,000
     2,080,000                 BBB/Baa1   Rosneft Finance SA, 7.5%,
                                          7/18/16 (144A)                                2,337,400
     1,000,000                 BBB/Baa1   Rosneft Finance SA, 7.875%,
                                          3/13/18 (144A)                                1,155,000
                                                                                    -------------
                                                                                    $   9,974,027
-------------------------------------------------------------------------------------------------


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 41


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Oil & Gas Refining & Marketing -- 0.4%
     2,475,000                BBB-/Baa2   Spectra Energy Capital LLC,
                                          6.2%, 4/15/18                             $   2,792,466
     2,890,000                 BBB/Baa2   Valero Energy Corp., 9.375%, 3/15/19          3,724,589
                                                                                    -------------
                                                                                    $   6,517,055
-------------------------------------------------------------------------------------------------
                                          Oil & Gas Storage &
                                          Transportation -- 1.3%
     2,900,000                BBB-/Baa2   DCP Midstream LLC, 9.75%,
                                          3/15/19 (144A)                            $   3,608,287
     3,950,000       5.85       BB/Baa3   DCP Midstream LLC, Floating Rate
                                          Note, 5/21/43 (144A)                          3,673,500
     1,200,000       3.26         NR/NR   Energy Transfer Partners LP, Floating
                                          Rate Note, 11/1/66                            1,092,000
     3,250,000                 BBB/Baa2   Kinder Morgan Energy Partners LP,
                                          5.95%, 2/15/18                                3,693,284
     1,500,000                BBB-/Baa2   Spectra Energy Capital LLC,
                                          6.75%, 7/15/18                                1,721,247
     2,200,000                BBB-/Baa3   Sunoco Logistics Partners
                                          Operations LP, 6.1%, 2/15/42                  2,246,171
     2,475,000                BBB-/Baa3   The Williams Companies, Inc.,
                                          7.75%, 6/15/31                                2,653,747
                                                                                    -------------
                                                                                    $  18,688,236
                                                                                    -------------
                                          Total Energy                              $  41,870,421
-------------------------------------------------------------------------------------------------
                                          MATERIALS -- 1.7%
                                          Diversified Chemicals -- 0.1%
       980,000                 BBB/Baa2   Eastman Chemical Co., 4.8%, 9/1/42        $     925,357
-------------------------------------------------------------------------------------------------
                                          Construction Materials -- 0.3%
     3,328,000                    B+/NR   Cemex Espana Luxembourg,
                                          9.875%, 4/30/19 (144A)                    $   3,802,240
       475,000                 BBB/Baa2   Holcim US Finance Sarl & Cie SCS,
                                          6.0%, 12/30/19 (144A)                           536,874
                                                                                    -------------
                                                                                    $   4,339,114
-------------------------------------------------------------------------------------------------
                                          Diversified Metals & Mining -- 0.7%
       900,000                 BB+/Baa3   AngloGold Ashanti Holdings Plc,
                                          5.125%, 8/1/22                            $     776,250
     3,085,000                 BB+/Baa3   AngloGold Ashanti Holdings Plc,
                                          5.375%, 4/15/20                               2,884,475
     2,525,000                 BBB/Baa3   Freeport-McMoRan Copper & Gold,
                                          Inc., 3.875%, 3/15/23                         2,387,754
     5,000,000                  BB+/Ba1   Gold Fields Orogen Holding BVI,
                                          Ltd., 4.875%, 10/7/20 (144A)                  4,043,345
                                                                                    -------------
                                                                                    $  10,091,824
-------------------------------------------------------------------------------------------------
                                          Gold -- 0.1%
     1,650,000                BBB+/Baa2   Goldcorp, Inc., 3.7%, 3/15/23             $   1,475,689
-------------------------------------------------------------------------------------------------


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

42 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Steel -- 0.5%
       500,000                  BB+/Ba1   ArcelorMittal, 6.0%, 3/1/21               $     530,000
     3,900,000                  BB+/Ba1   ArcelorMittal, 6.125%, 6/1/18                 4,280,250
     1,105,000                  BB+/Ba2   Commercial Metals Co.,
                                          7.35%, 8/15/18                                1,259,700
     1,175,000                 BBB/Baa2   Glencore Funding LLC, 4.125%,
                                          5/30/23 (144A)                                1,098,055
                                                                                    -------------
                                                                                    $   7,168,005
                                                                                    -------------
                                          Total Materials                           $  23,999,989
-------------------------------------------------------------------------------------------------
                                          CAPITAL GOODS -- 2.1%
                                          Aerospace & Defense -- 0.2%
     2,250,000                   BB/Ba2   Bombardier, Inc., 4.25%,
                                          1/15/16 (144A)                            $   2,351,250
-------------------------------------------------------------------------------------------------
                                          Building Products -- 0.5%
       825,000                 BBB-/Ba3   Masco Corp., 5.95%, 3/15/22               $     872,438
     4,260,000                 BBB-/Ba3   Masco Corp., 7.125%, 3/15/20                  4,862,828
     1,750,000       5.75     BBB+/Baa2   Stanley Black & Decker, Inc.,
                                          Floating Rate Note, 12/15/53                  1,841,875
                                                                                    -------------
                                                                                    $   7,577,141
-------------------------------------------------------------------------------------------------
                                          Industrial Conglomerates -- 0.2%
     2,950,000                BBB+/Baa2   Tyco Electronics Group SA,
                                          6.55%, 10/1/17                            $   3,375,968
-------------------------------------------------------------------------------------------------
                                          Construction & Farm Machinery
                                          & Heavy Trucks -- 0.3%
     3,200,000                     A/A3   Cummins, Inc., 5.65%, 3/1/98              $   3,067,782
       910,000                     A/A3   Cummins, Inc., 6.75%, 2/15/27                 1,061,237
                                                                                    -------------
                                                                                    $   4,129,019
-------------------------------------------------------------------------------------------------
                                          Industrial Machinery -- 0.2%
     1,810,000                 BBB/Baa2   Valmont Industries, Inc.,
                                          6.625%, 4/20/20                           $   2,030,764
-------------------------------------------------------------------------------------------------
                                          Trading Companies &
                                          Distributors -- 0.7%
     3,525,000                   BB+/NR   Aviation Capital Group Corp.,
                                          6.75%, 4/6/21 (144A)                      $   3,833,201
     5,660,000                 BBB/Baa2   GATX Corp., 6.0%, 2/15/18                     6,315,977
                                                                                    -------------
                                                                                    $  10,149,178
                                                                                    -------------
                                          Total Capital Goods                       $  29,613,320
-------------------------------------------------------------------------------------------------
                                          TRANSPORTATION -- 0.1%
                                          Airlines -- 0.1%
       135,834                 BBB/Baa2   Southwest Airlines Co., 7.67%,
                                          1/2/14                                    $     135,851


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 43


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                           
                                          Airlines -- (continued)
     1,500,000                  A-/Baa1   US Airways 2013-1 Class A Pass
                                          Through Trust, 3.95%, 5/15/27             $   1,458,750
                                                                                    -------------
                                                                                    $   1,594,601
-------------------------------------------------------------------------------------------------
                                          Trucking -- 0.0%+
       529,000                BBB-/Baa2   Asciano Finance, Ltd., 4.625%,
                                          9/23/20 (144A)                            $     529,548
                                                                                    -------------
                                          Total Transportation                      $   2,124,149
-------------------------------------------------------------------------------------------------
                                          AUTOMOBILES &
                                          COMPONENTS -- 0.0%+
                                          Automobile Manufacturers -- 0.0%+
       655,000                BBB+/Baa1   Hyundai Motor Manufacturing
                                          Czech s.r.o., 4.5%, 4/15/15 (144A)        $     682,059
                                                                                    -------------
                                          Total Automobiles & Components            $     682,059
-------------------------------------------------------------------------------------------------
                                          CONSUMER DURABLES &
                                          APPAREL -- 0.1%
                                          Home Furnishings -- 0.1%
       800,000                 BBB/Baa3   Mohawk Industries, Inc.,
                                          3.85%, 2/1/23                             $     760,000
                                                                                    -------------
                                          Total Consumer Durables & Apparel         $     760,000
-------------------------------------------------------------------------------------------------
                                          CONSUMER SERVICES -- 0.6%
                                          Casinos & Gaming -- 0.2%
     1,010,000                 BBB-/Ba1   GLP Capital LP, 4.375%,
                                          11/1/18 (144A)                            $   1,032,725
     1,885,000                 BBB-/Ba1   GLP Capital LP, 4.875%,
                                          11/1/20 (144A)                                1,885,000
                                                                                    -------------
                                                                                    $   2,917,725
-------------------------------------------------------------------------------------------------
                                          Education Services -- 0.4%
     1,000,000                   NR/Aa2   Bowdoin College, 4.693%, 7/1/12           $     792,108
     2,600,000                  AAA/Aaa   President and Fellows of Harvard
                                          College, 2.3%, 10/1/23                        2,321,072
     3,550,000                  AA-/Aa2   Tufts University, 5.017%, 4/15/12             3,221,845
                                                                                    -------------
                                                                                    $   6,335,025
                                                                                    -------------
                                          Total Consumer Services                   $   9,252,750
-------------------------------------------------------------------------------------------------
                                          RETAILING -- 0.1%
                                          Internet Retail -- 0.1%
       800,000                 BBB-/Ba1   Expedia, Inc., 5.95%, 8/15/20             $     865,902
                                                                                    -------------
                                          Total Retailing                           $     865,902
-------------------------------------------------------------------------------------------------


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

44 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                           
                                          FOOD & STAPLES RETAILING -- 0.2%
                                          Drug Retail -- 0.2%
       708,619                BBB+/Baa1   CVS Pass-Through Trust, 5.298%,
                                          1/11/27 (144A)                            $     768,650
     1,443,473                BBB+/Baa1   CVS Pass-Through Trust, 5.773%,
                                          1/10/33 (144A)                                1,515,723
                                                                                    -------------
                                                                                    $   2,284,373
                                                                                    -------------
                                          Total Food & Staples Retailing            $   2,284,373
-------------------------------------------------------------------------------------------------
                                          FOOD, BEVERAGE & TOBACCO -- 1.1%
                                          Distillers & Vintners -- 0.1%
     1,500,000                BBB-/Baa2   Beam, Inc., 3.25%, 5/15/22                $   1,437,578
-------------------------------------------------------------------------------------------------
                                          Agricultural Products -- 0.4%
     5,175,000                 BBB/Baa2   Viterra, Inc., 5.95%, 8/1/20 (144A)       $   5,496,352
-------------------------------------------------------------------------------------------------
                                          Packaged Foods & Meats -- 0.5%
     3,240,000                 BBB/Baa2   Kraft Foods Group, Inc., 3.5%, 6/6/22     $   3,157,685
     3,725,000                BBB-/Baa1   Mondelez International, Inc.,
                                          6.5%, 2/9/40                                  4,451,379
                                                                                    -------------
                                                                                    $   7,609,064
-------------------------------------------------------------------------------------------------
                                          Tobacco -- 0.1%
     1,050,000                BBB-/Baa2   Lorillard Tobacco Co., 3.75%,
                                          5/20/23                                   $     955,887
                                                                                    -------------
                                          Total Food, Beverage & Tobacco            $  15,498,881
-------------------------------------------------------------------------------------------------
                                          HOUSEHOLD & PERSONAL
                                          PRODUCTS -- 0.2%
                                          Personal Products -- 0.2%
     3,720,000                BBB-/Baa2   Avon Products, Inc., 5.0%, 3/15/23        $   3,616,662
                                                                                    -------------
                                          Total Household & Personal Products       $   3,616,662
-------------------------------------------------------------------------------------------------
                                          HEALTH CARE EQUIPMENT &
                                          SERVICES -- 0.3%
                                          Health Care Services -- 0.2%
     2,600,000                    A+/A1   Catholic Health Initiatives,
                                          4.35%, 11/1/42                            $   2,255,508
-------------------------------------------------------------------------------------------------
                                          Health Care Facilities -- 0.1%
     2,400,000                    A-/A3   NYU Hospitals Center, 4.428%, 7/1/42      $   2,003,338
                                                                                    -------------
                                          Total Health Care Equipment
                                          & Services                                $   4,258,846
-------------------------------------------------------------------------------------------------
                                          PHARMACEUTICALS, BIOTECHNOLOGY
                                          & LIFE SCIENCES -- 0.4%
                                          Life Sciences Tools & Services -- 0.4%
     5,366,000                BBB+/Baa2   Agilent Technologies, Inc., 6.5%,
                                          11/1/17                                   $   6,215,647
                                                                                    -------------
                                          Total Pharmaceuticals,
                                          Biotechnology & Life Sciences             $   6,215,647
-------------------------------------------------------------------------------------------------


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 45


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          BANKS -- 4.7%
                                          Diversified Banks -- 2.4%
     3,515,000                 BBB/Baa3   Barclays Bank Plc, 6.05%,
                                          12/4/17 (144A)                            $   3,929,710
     3,815,000                  NR/Baa2   BBVA Bancomer SA Texas, 6.5%,
                                          3/10/21 (144A)                                4,024,825
     3,435,000                  AA-/Aa2   Cooperatieve Centrale
                                          Raiffeisen-Boerenleenbank BA
                                          Netherlands, 3.875%, 2/8/22                   3,453,724
      625,000                    A+/Aa3   Export-Import Bank of Korea,
                                          5.875%, 1/14/15                                 656,797
     1,855,000                   A+/Aa3   Industrial Bank of Korea, 7.125%,
                                          4/23/14 (144A)                                1,890,503
     3,476,000                 BBB/Baa2   Intesa Sanpaolo S.p.A., 3.625%,
                                          8/12/15 (144A)                                3,576,613
     1,400,000                 BBB/Baa2   Intesa Sanpaolo S.p.A., 6.5%,
                                          2/24/21 (144A)                                1,532,976
     3,000,000                 BBB/Baa2   Macquarie Bank, Ltd., 6.625%,
                                          4/7/21 (144A)                                 3,317,817
     4,500,000                   A/Baa1   Nordea Bank AB, 4.25%,
                                          9/21/22 (144A)                                4,449,465
     1,368,421       2.99          A/NR   SBP DPR Finance Co., Floating Rate
                                          Note, 3/15/17 (144A)                          1,364,567
     2,600,000       4.50       NR/Baa3   Scotiabank Peru SA, Floating Rate
                                          Note, 12/13/27 (144A)                         2,275,000
     2,200,000                     A/A2   Standard Chartered Bank, 6.4%,
                                          9/26/17 (144A)                                2,491,522
     1,300,000                    A-/A3   Standard Chartered Plc, 3.95%,
                                          1/11/23 (144A)                                1,205,779
                                                                                    -------------
                                                                                    $  34,169,298
-------------------------------------------------------------------------------------------------
                                          Regional Banks -- 2.0%
     1,190,000                    A-/NR   CoBank ACB, 7.875%,
                                          4/16/18 (144A)                            $   1,430,322
     3,350,000                     A/A2   HSBC Bank USA NA New York NY,
                                          6.0%, 8/9/17                                  3,771,346
     2,505,000                     A/A2   Mellon Funding Corp., 5.5%, 11/15/18          2,836,690
     1,435,000                    A-/A3   PNC Bank NA, 6.0%, 12/7/17                    1,635,249
     4,080,000                BBB-/Baa2   Santander Bank NA, 8.75%, 5/30/18             4,902,300
     1,025,000                 BBB/Baa1   SunTrust Banks, Inc., 3.5%, 1/20/17           1,077,805
     6,273,000       4.46      BBB/Baa3   The PNC Financial Services Group,
                                          Inc., Floating Rate Note (Perpetual)          6,257,318
     1,050,000       6.75      BBB/Baa3   The PNC Financial Services Group,
                                          Inc., Floating Rate Note (Perpetual)          1,092,525
     1,860,000       4.85      BBB/Baa3   The PNC Financial Services Group,
                                          Inc., Floating Rate Note (Perpetual)          1,665,630
     3,520,000                    A+/A1   Wachovia Bank NA, 6.0%, 11/15/17              4,061,728
                                                                                    -------------
                                                                                    $  28,730,913
-------------------------------------------------------------------------------------------------


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

46 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Thrifts & Mortgage Finance -- 0.3%
     2,300,000                BBB-/Baa2   Astoria Financial Corp., 5.0%,
                                          6/19/17                                   $   2,467,070
     2,000,000                 BBB/Baa2   Santander Holdings USA, Inc.
                                          Pennsylvania, 3.0%, 9/24/15                   2,065,298
                                                                                    -------------
                                                                                    $   4,532,368
                                                                                    -------------
                                          Total Banks                               $  67,432,579
-------------------------------------------------------------------------------------------------
                                          DIVERSIFIED FINANCIALS -- 6.7%
                                          Other Diversified Financial
                                          Services -- 2.0%
     3,000,000                BBB+/Baa2   Alterra Finance LLC, 6.25%, 9/30/20       $   3,375,255
     1,100,000                BBB+/Baa3   Bank of America Corp., 7.75%,
                                          8/15/15                                       1,210,239
     4,160,000                    A-/NR   Carlyle Holdings II Finance LLC,
                                          5.625%, 3/30/43 (144A)                        4,089,347
     2,000,000       5.95       BB+/Ba3   Citigroup, Inc., Floating Rate
                                          Note (Perpetual)                              1,850,700
     4,860,000                    AA/A2   General Electric Capital Corp.,
                                          5.3%, 2/11/21                                 5,436,493
     1,800,000       7.12      AA-/Baa1   General Electric Capital Corp.,
                                          Floating Rate Note (Perpetual)                2,011,500
     2,575,000                     A/A3   JPMorgan Chase & Co., 6.0%,
                                          1/15/18                                       2,965,053
     2,325,000       5.15       BBB/Ba1   JPMorgan Chase & Co., Floating
                                          Rate Note (Perpetual)                         2,086,688
     5,025,000                     A/NR   KKR Group Finance Co. II LLC,
                                          5.5%, 2/1/43 (144A)                           4,783,760
     1,250,000       7.70        BBB/NR   Tiers Trust, Floating Rate Note,
                                          10/15/97 (144A) (e)                             800,055
                                                                                    -------------
                                                                                    $  28,609,090
-------------------------------------------------------------------------------------------------
                                          Specialized Finance -- 0.9%
     3,200,000                BBB+/Baa1   BM&FBovespa SA, 5.5%,
                                          7/16/20 (144A)                            $   3,352,000
     5,205,000                  BBB-/NR   Cantor Fitzgerald LP, 7.875%,
                                          10/15/19 (144A)                               5,465,250
     1,475,000                BBB+/Baa2   LeasePlan Corp NV, 2.5%,
                                          5/16/18 (144A)                                1,433,995
     2,000,000                    A+/A1   National Rural Utilities
                                          Cooperative Finance Corp.,
                                          5.45%, 2/1/18                                 2,255,808
                                                                                    -------------
                                                                                    $  12,507,053
-------------------------------------------------------------------------------------------------
                                          Consumer Finance -- 0.4%
     1,465,000                 BBB/Baa1   Capital One Bank USA NA,
                                          8.8%, 7/15/19                             $   1,862,122
       790,000                  BBB+/A3   Nissan Motor Acceptance Corp.,
                                          4.5%, 1/30/15 (144A)                            821,188


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 47


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Consumer Finance -- (continued)
     3,155,000       4.00      BBB-/Ba1   SLM Corp., Floating Rate Note,
                                          7/25/14                                   $   3,156,704
                                                                                    -------------
                                                                                    $   5,840,014
-------------------------------------------------------------------------------------------------
                                          Asset Management & Custody
                                          Banks -- 0.7%
     1,400,000                    A+/NR   Blackstone Holdings Finance Co.
                                          LLC, 4.75%, 2/15/23 (144A)                $   1,450,701
       733,000                    A-/A3   Eaton Vance Corp., 6.5%, 10/2/17                831,987
     4,050,000                BBB-/Baa3   Janus Capital Group, Inc., 6.7%,
                                          6/15/17                                       4,509,987
     2,000,000                     A/A2   The Bank of New York Mellon Corp.,
                                          4.95%, 3/15/15                                2,100,292
     1,250,000       4.50      BBB/Baa2   The Bank of New York Mellon Corp.,
                                          Floating Rate Note (Perpetual)                1,134,375
                                                                                    -------------
                                                                                    $  10,027,342
-------------------------------------------------------------------------------------------------
                                          Investment Banking &
                                          Brokerage -- 2.7%
    11,040,000       4.00       BB+/Ba2   Goldman Sachs Capital II, Floating
                                          Rate Note (Perpetual)                     $   7,761,120
     3,125,000                 BBB/Baa3   Jefferies Group LLC, 6.875%, 4/15/21          3,559,469
     2,730,000                   BBB/A3   Macquarie Group, Ltd., 6.0%,
                                          1/14/20 (144A)                                3,015,394
       221,000                  A-/Baa2   Merrill Lynch & Co., Inc., 5.0%,
                                          2/3/14                                          221,811
     4,350,000                BBB+/Baa3   Merrill Lynch & Co., Inc., 7.75%,
                                          5/14/38                                       5,616,133
     5,100,000                BBB+/Baa3   Morgan Stanley, 4.1%, 5/22/23                 4,935,530
       300,000                BBB+/Baa3   Morgan Stanley, 4.875%, 11/1/22                 307,098
     3,125,000                  A-/Baa2   Morgan Stanley, 5.5%, 1/26/20                 3,508,038
     1,600,000                   NR/Aaa   North American Development Bank,
                                          2.3%, 10/10/18                                1,575,504
     4,750,000                  NR/Baa3   Scottrade Financial Services, Inc.,
                                          6.125%, 7/11/21 (144A)                        4,690,649
     2,000,000                  A-/Baa1   The Goldman Sachs Group, Inc.,
                                          5.5%, 11/15/14                                2,084,510
     1,450,000                  BBB-/NR   UBS AG, 7.625%, 8/17/22                       1,660,707
                                                                                    -------------
                                                                                    $  38,935,963
-------------------------------------------------------------------------------------------------
                                          Diversified Capital Markets -- 0.0%+
       300,000       7.50        BB-/NR   Credit Suisse Group AG, Floating
                                          Rate Note (Perpetual) (144A)              $     316,875
                                                                                    -------------
                                          Total Diversified Financials              $  96,236,337
-------------------------------------------------------------------------------------------------


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

48 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          INSURANCE -- 9.1%
                                          Life & Health Insurance -- 2.2%
     1,850,000                  BBB+/NR   Delphi Financial Group, Inc.,
                                          7.875%, 1/31/20                           $   2,151,278
     1,690,000                  A-/Baa1   Lincoln National Corp., 8.75%,
                                          7/1/19                                        2,175,294
     3,380,000       6.05      BBB/Baa3   Lincoln National Corp., Floating
                                          Rate Note, 4/20/67                            3,354,650
     4,200,000                 BBB/Baa2   MetLife, Inc., 10.75%, 8/1/69                 6,195,000
     4,250,000                  A-/Baa2   Protective Life Corp., 7.375%,
                                          10/15/19                                      5,183,245
     1,090,000                   A/Baa1   Prudential Financial, Inc., 4.5%,
                                          11/16/21                                      1,160,068
     1,500,000       5.62     BBB+/Baa2   Prudential Financial, Inc., Floating
                                          Rate Note, 6/15/43                            1,470,000
     2,140,000       8.88     BBB+/Baa2   Prudential Financial, Inc., Floating
                                          Rate Note, 6/15/68                            2,602,775
     1,800,000       5.88     BBB+/Baa2   Prudential Financial, Inc., Floating
                                          Rate Note, 9/15/42                            1,829,250
     3,205,000                  AA-/Aa2   Teachers Insurance & Annuity
                                          Association of America, 6.85%,
                                          12/16/39 (144A)                               3,956,217
     1,080,000                 BBB/Baa2   Unum Group, 5.75%, 8/15/42                    1,103,693
                                                                                    -------------
                                                                                    $  31,181,470
-------------------------------------------------------------------------------------------------
                                          Multi-line Insurance -- 1.0%
     3,900,000                BBB+/Baa2   Assurant, Inc., 4.0%, 3/15/23             $   3,752,568
     2,335,000                   BBB/A3   AXA SA, 8.6%, 12/15/30                        2,874,969
     1,807,000                BBB-/Baa3   Genworth Holdings, Inc., 7.2%,
                                          2/15/21                                       2,098,314
     3,035,000                BBB-/Baa2   Liberty Mutual Group, Inc., 7.3%,
                                          6/15/14 (144A)                                3,119,725
     2,650,000                    A+/A2   Loews Corp., 5.25%, 3/15/16                   2,888,683
                                                                                    -------------
                                                                                    $  14,734,259
-------------------------------------------------------------------------------------------------
                                          Property & Casualty Insurance -- 1.5%
     1,200,000                BBB-/Baa3   Fidelity National Financial, Inc.,
                                          5.5%, 9/1/22                              $   1,244,597
     1,350,000                  NR/Baa3   First American Financial Corp.,
                                          4.3%, 2/1/23                                  1,285,862
       250,000        N/A         NR/NR   Loma Reinsurance, Ltd. Bermuda,
                                          Floating Rate Note, 1/8/18 (Cat
                                          Bond) (144A)                                    250,025
     1,000,000                BBB-/Baa2   OneBeacon US Holdings, Inc.,
                                          4.6%, 11/9/22                                   981,130
     2,670,000       6.80       BBB/Ba1   QBE Capital Funding II LP, Floating
                                          Rate Note (Perpetual) (144A)                  2,643,300


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 49


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Property & Casualty
                                          Insurance -- (continued)
     1,100,000                  A-/Baa2   QBE Insurance Group, Ltd., 2.4%,
                                          5/1/18 (144A)                             $   1,056,770
     5,455,000       6.50      BBB/Baa1   The Allstate Corp., Floating Rate
                                          Note, 5/15/57                                 5,675,928
       700,000                BBB-/Baa3   The Hanover Insurance Group, Inc.,
                                          7.5%, 3/1/20                                    828,127
     1,952,000                BBB-/Baa3   The Hanover Insurance Group, Inc.,
                                          7.625%, 10/15/25                              2,292,044
     2,000,000                     A/A2   The Travelers Companies, Inc.,
                                          6.25%, 6/15/37                                2,397,540
     2,948,000       6.50       BBB/Ba1   XL Group Plc, Floating Rate Note
                                          (Perpetual)                                   2,900,095
                                                                                    -------------
                                                                                    $  21,555,418
-------------------------------------------------------------------------------------------------
                                          Reinsurance -- 4.4%
     1,800,000       6.38         NR/NR   Aquarius + Investments Plc for Swiss
                                          Reinsurance Co., Ltd., Floating Rate
                                          Note, 9/1/24                              $   1,867,500
     1,350,000       4.25        BB+/NR   Armor Re, Ltd., Floating Rate Note,
                                          5/14/14 (Cat Bond) (144A)                     1,358,775
       500,000       3.68         BB/NR   Atlas IX Capital, Ltd., Floating Rate
                                          Note, 1/17/19 (Cat Bond) (144A)                 506,300
       250,000       8.25        BB-/NR   Atlas Reinsurance VII, Ltd., Floating
                                          Rate Note, 1/7/16 (Cat Bond) (144A)             258,550
       500,000       4.30        BB+/NR   Blue Danube II, Ltd., Floating Rate
                                          Note, 5/23/16 (Cat Bond) (144A)                 505,050
       250,000       6.24        BB+/NR   Blue Danube, Ltd., Floating Rate
                                          Note, 4/10/15 (Cat Bond) (144A)                 258,250
       350,000       2.56        BB+/NR   Bosphorus 1 Re, Ltd., Floating Rate
                                          Note, 5/3/16 (Cat Bond) (144A)                  350,070
     1,250,000       5.29        BB-/NR   Caelus Re, Ltd., Floating Rate Note,
                                          3/7/16 (Cat Bond) (144A)                      1,267,250
     1,100,000       6.85         NR/NR   Caelus Re, Ltd., Floating Rate Note,
                                          4/7/17 (Cat Bond) (144A)                      1,136,850
     1,000,000       4.74       NR/Baa1   Combine Re, Ltd., Floating Rate Note,
                                          1/7/15 (Cat Bond) (144A)                      1,021,000
       950,000      10.28        BB-/NR   Compass Re, Ltd., Floating Rate Note,
                                          1/8/15 (Cat Bond) (144A)                        998,545
       300,000       9.03        BB-/NR   Compass Re, Ltd., Floating Rate Note,
                                          1/8/15 (Cat Bond) (144A)                        310,470
       250,000       9.06         BB/NR   East Lane Re V, Ltd., Floating Rate
                                          Note, 3/16/16 (Cat Bond) (144A)                 271,600
       850,000       6.71         BB/NR   East Lane Re, Ltd., Floating Rate Note,
                                          3/13/15 (Cat Bond) (144A)                       882,300
       250,000       7.30        BB-/NR   Embarcadero Reinsurance, Ltd.,
                                          Floating Rate Note, 2/13/15 (Cat
                                          Bond) (144A)                                    258,125


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

50 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Reinsurance -- (continued)
       500,000       6.67        BB-/NR   Embarcadero Reinsurance, Ltd.,
                                          Floating Rate Note, 2/4/16 (Cat
                                          Bond) (144A)                              $     507,850
       650,000       5.24        BB+/NR   Embarcadero Reinsurance, Ltd.,
                                          Floating Rate Note, 8/7/15 (Cat
                                          Bond) (144A)                                    671,515
     4,475,000      17.79         B+/NR   Everglades Re, Ltd., Floating Rate
                                          Note, 4/30/14 (Cat Bond) (144A)               4,696,960
     1,050,000       5.07        BB+/NR   Foundation Re III, Ltd., Floating Rate
                                          Note, 2/25/15 (Cat Bond) (144A)               1,076,355
     2,450,000       5.80         BB/NR   Foundation Re III, Ltd., Floating Rate
                                          Note, 2/3/14 (Cat Bond) (144A)                2,456,615
     1,200,000       7.40         NR/NR   Galileo Re, Ltd., Floating Rate Note,
                                          1/9/19 (Cat Bond) (144A)                      1,231,080
       900,000       4.04        BB+/NR   Ibis Re II, Ltd., Floating Rate Note,
                                          6/28/16 (Cat Bond) (144A)                       913,050
     1,850,000       7.66        BB-/NR   Johnston Re, Ltd., Floating Rate Note,
                                          5/8/14 (Cat Bond) (144A)                      1,885,705
       250,000       6.96        BB-/NR   Johnston Re, Ltd., Floating Rate Note,
                                          5/8/14 (Cat Bond) (144A)                        254,225
     1,000,000       7.27         BB/NR   Lodestone Re, Ltd., Floating Rate Note,
                                          1/8/14 (Cat Bond) (144A)                      1,000,200
     2,400,000       6.02         BB/NR   Lodestone Re, Ltd., Floating Rate Note,
                                          1/8/14 (Cat Bond) (144A)                      2,400,240
     1,200,000       4.08         BB/NR   Longpoint Re, Ltd. III, Floating Rate
                                          Note, 5/18/16 (Cat Bond) (144A)               1,213,680
       600,000       6.24        BB+/NR   Longpoint Re, Ltd., Floating Rate Note,
                                          6/12/15 (Cat Bond) (144A)                       628,620
     2,650,000                   BBB/NR   Montpelier Re Holdings, Ltd., 4.7%,
                                          10/15/22                                      2,600,169
       650,000       9.04         BB/NR   Mystic Re, Ltd., Floating Rate Note,
                                          3/12/15 (Cat Bond) (144A)                       679,965
       500,000       8.61         B+/NR   Mythen Re, Ltd. Series 2012-2 Class A,
                                          Floating Rate Note, 1/5/17 (Cat
                                          Bond) (144A)                                    521,600
       500,000       8.24        NR/Ba3   Mythen Re, Ltd., Floating Rate Note,
                                          5/7/15 (Cat Bond) (144A)                        535,150
       250,000       8.74        NR/Ba3   Mythen Re, Ltd., Floating Rate Note,
                                          5/7/15 (Cat Bond) (144A)                        265,800
     5,048,000                   BBB/NR   Platinum Underwriters Finance, Inc.,
                                          7.5%, 6/1/17                                  5,565,082
       750,000       7.56        BB-/NR   Queen Street II Capital, Ltd., Floating
                                          Rate Note, 4/9/14 (Cat Bond) (144A)             757,275
       500,000       7.56        BB-/NR   Queen Street IV Capital, Ltd., Floating
                                          Rate Note, 4/9/15 (Cat Bond) (144A)             513,250
       250,000      10.60          B/NR   Queen Street VI Re, Ltd., Floating Rate
                                          Note, 4/9/15 (Cat Bond) (144A)                  263,025


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 51


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Reinsurance -- (continued)
       900,000       8.66          B/NR   Queen Street VII Re, Ltd., Floating Rate
                                          Note, 4/8/16 (Cat Bond) (144A)            $     931,860
       725,000       8.80         B+/NR   Residential Reinsurance 2011, Ltd.,
                                          Floating Rate Note, 12/6/16 (Cat
                                          Bond) (144A)                                    772,778
       650,000       9.06        BB-/NR   Residential Reinsurance 2011, Ltd.,
                                          Floating Rate Note, 6/6/15 (Cat
                                          Bond) (144A)                                    694,720
     2,800,000       4.57        BB+/NR   Residential Reinsurance 2012, Ltd.,
                                          Floating Rate Note, 12/6/16 (Cat
                                          Bond) (144A)                                  2,886,240
       800,000       8.07         BB/NR   Residential Reinsurance 2012, Ltd.,
                                          Floating Rate Note, 6/6/16 (Cat
                                          Bond) (144A)                                    885,280
       275,000      10.24        BB-/NR   Residential Reinsurance 2012, Ltd.,
                                          Floating Rate Note, 6/6/16 (Cat
                                          Bond) (144A)                                    309,155
       250,000       9.32         B-/NR   Residential Reinsurance 2013, Ltd.,
                                          Floating Rate Note, 6/6/17 (Cat
                                          Bond) (144A)                                    258,475
     1,250,000       4.00         BB/NR   Sanders Re, Ltd., Floating Rate Note,
                                          5/5/17 (Cat Bond) (144A)                      1,240,750
     1,200,000       3.54        BB+/NR   Sanders Re, Ltd., Floating Rate Note,
                                          5/5/17 (Cat Bond) (144A)                      1,193,520
       250,000                    NR/NR   Silverton RE, Ltd., 0.0%, 9/16/16
                                          (Cat Bond) (144A) (d)                           250,400
     3,600,000                 BBB/Baa3   Sirius International Group, Ltd.,
                                          6.375%, 3/20/17 (144A)                        3,901,975
     2,110,000       7.51       BB+/Ba2   Sirius International Group, Ltd.,
                                          Floating Rate Note (Perpetual) (144A)         2,174,287
     1,400,000       9.30          B/NR   Successor X, Ltd. Class IV-E3, Floating
                                          Rate Note, 2/25/14 (Cat Bond) (144A)          1,411,760
       250,000      11.32         B-/NR   Successor X, Ltd., Floating Rate Note,
                                          11/10/15 (Cat Bond) (144A)                      263,925
       300,000       8.66         B+/NR   Tar Heel Re, Ltd., Floating Rate Note,
                                          5/9/16 (Cat Bond) (144A)                        319,170
       250,000       6.25         NR/NR   Tradewynd Re, Ltd., Floating Rate
                                          Note, 1/8/15 (Cat Bond) (144A)                  250,275
     1,500,000       2.80       BBB-/NR   Vita Capital V, Ltd., Floating Rate
                                          Note, 1/15/17 (Cat Bond) (144A)               1,526,850
       500,000       2.79       BBB+/NR   Vitality Re IV, Ltd., Floating Rate
                                          Note, 1/9/17 (Cat Bond) (144A)                  509,550
     1,400,000       5.88         NR/NR   Wilton Re Finance LLC, Floating
                                          Rate Note, 3/30/33 (144A)                     1,379,000
                                                                                    -------------
                                                                                    $  63,048,016
                                                                                    -------------
                                          Total Insurance                           $ 130,519,163
-------------------------------------------------------------------------------------------------


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

52 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                           
                                          REAL ESTATE -- 2.6%
                                          Diversified REIT -- 0.4%
       725,000                 BBB/Baa2   Digital Realty Trust LP, 5.875%,
                                          2/1/20                                    $     771,296
     1,050,000                 BBB/Baa2   Goodman Funding Pty, Ltd., 6.0%,
                                          3/22/22 (144A)                                1,130,415
     3,455,000                 BBB/Baa2   Goodman Funding Pty, Ltd.,
                                          6.375%, 4/15/21 (144A)                        3,817,765
                                                                                    -------------
                                                                                    $   5,719,476
-------------------------------------------------------------------------------------------------
                                          Industrial REIT -- 0.1%
     1,475,000                BBB-/Baa2   DCT Industrial Operating Partnership
                                          LP, 4.5%, 10/15/23 (144A)                 $   1,433,241
-------------------------------------------------------------------------------------------------
                                          Office REIT -- 0.7%
     1,093,000                BBB-/Baa2   Alexandria Real Estate Equities,
                                          Inc., 3.9%, 6/15/23                       $   1,018,489
     2,670,000                BBB-/Baa2   Alexandria Real Estate Equities,
                                          Inc., 4.6%, 4/1/22                            2,686,685
       900,000                BBB-/Baa3   BioMed Realty LP, 4.25%, 7/15/22                864,090
     1,500,000                BBB-/Baa3   Corporate Office Properties LP,
                                          3.6%, 5/15/23                                 1,359,518
     2,100,000                 BBB/Baa2   Highwoods Realty LP, 3.625%,
                                          1/15/23                                       1,919,988
     2,550,000                 BBB/Baa2   Piedmont Operating Partnership
                                          LP, 3.4%, 6/1/23                              2,263,255
                                                                                    -------------
                                                                                    $  10,112,025
-------------------------------------------------------------------------------------------------
                                          Retail REIT -- 0.3%
       575,000                BBB-/Baa2   DDR Corp., 4.625%, 7/15/22                $     586,487
     2,905,000                BBB-/Baa2   DDR Corp., 7.5%, 4/1/17                       3,385,809
                                                                                    -------------
                                                                                    $   3,972,296
-------------------------------------------------------------------------------------------------
                                          Specialized REIT -- 1.1%
       730,000                BBB-/Baa3   CubeSmart LP, 4.8%, 7/15/22               $     749,814
     1,000,000                 BBB/Baa2   Health Care Real Estate Investment
                                          Trust, Inc., 4.5%, 1/15/24                      987,348
     2,425,000                BBB-/Baa3   Healthcare Realty Trust, Inc.,
                                          6.5%, 1/17/17                                 2,719,521
     1,985,000                BBB-/Baa2   Hospitality Properties Trust,
                                          5.0%, 8/15/22                                 2,017,228
     4,175,000                BBB-/Baa2   Hospitality Properties Trust,
                                          7.875%, 8/15/14                               4,208,888
     4,285,000                BBB-/Baa3   Senior Housing Properties Trust,
                                          6.75%, 4/15/20                                4,757,935
                                                                                    -------------
                                                                                    $  15,440,734
                                                                                    -------------
                                          Total Real Estate                         $  36,677,772
-------------------------------------------------------------------------------------------------


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 53


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                           
                                          SOFTWARE & SERVICES -- 0.1%
                                          Data Processing & Outsourced
                                          Services -- 0.0%+
       447,000                  B-/Caa1   First Data Corp., 8.25%,
                                          1/15/21 (144A)                            $     475,496
-------------------------------------------------------------------------------------------------
                                          Home Entertainment Software -- 0.1%
       650,000                  BB+/Ba2   Activision Blizzard, Inc., 6.125%,
                                          9/15/23 (144A)                            $     677,625
                                                                                    -------------
                                          Total Software & Services                 $   1,153,121
-------------------------------------------------------------------------------------------------
                                          TECHNOLOGY HARDWARE &
                                          EQUIPMENT -- 0.1%
                                          Computer Hardware -- 0.1%
     2,100,000                   BB/Ba3   NCR Corp., 4.625%, 2/15/21                $   2,010,750
                                                                                    -------------
                                          Total Technology Hardware
                                          & Equipment                               $   2,010,750
-------------------------------------------------------------------------------------------------
                                          SEMICONDUCTORS &
                                          SEMICONDUCTOR EQUIPMENT -- 0.3%
                                          Semiconductor Equipment -- 0.3%
     3,100,000                 BBB/Baa1   KLA-Tencor Corp., 6.9%, 5/1/18            $   3,627,437
                                                                                    -------------
                                          Total Semiconductors &
                                          Semiconductor Equipment                   $   3,627,437
-------------------------------------------------------------------------------------------------
                                          TELECOMMUNICATION
                                          SERVICES -- 1.3%
                                          Integrated Telecommunication
                                          Services -- 1.2%
       469,000                     B/B3   Cincinnati Bell, Inc., 8.375%,
                                          10/15/20                                  $     507,692
     3,355,000                    NR/A2   GTP Acquisition Partners I LLC,
                                          4.347%, 6/15/16 (144A)                        3,531,010
       792,094                    NR/NR   GTP Cellular Sites LLC, 3.721%,
                                          3/15/17 (144A)                                  809,605
     3,950,000                    NR/A2   GTP Towers Issuer LLC, 4.436%,
                                          2/15/15 (144A)                                4,060,612
     2,750,000                 BBB/Baa2   Telefonica Emisiones SAU,
                                          6.221%, 7/3/17                                3,100,133
     1,500,000                    NR/NR   Unison Ground Lease Funding
                                          LLC, 2.981%, 3/15/20 (144A)                   1,424,896
     3,460,000                BBB+/Baa1   Verizon Communications, Inc.,
                                          6.55%, 9/15/43                                4,048,058
                                                                                    -------------
                                                                                    $  17,482,006
-------------------------------------------------------------------------------------------------
                                          Wireless Telecommunication
                                          Services -- 0.1%
     1,625,000                    NR/A2   Crown Castle Towers LLC, 6.113%,
                                          1/15/20 (144A)                            $   1,822,163
                                                                                    -------------
                                          Total Telecommunication Services          $  19,304,169
-------------------------------------------------------------------------------------------------


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

54 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          UTILITIES -- 2.7%
                                          Electric Utilities -- 1.7%
       980,000                    A-/A3   Commonwealth Edison Co.,
                                          6.15%, 9/15/17                            $   1,132,429
       615,593                BBB-/Baa3   Crockett Cogeneration LP, 5.869%,
                                          3/30/25 (144A)                                  646,141
     5,400,000       5.25       BBB+/A3   Electricite de France SA, Floating
                                          Rate Note (Perpetual) (144A)                  5,370,300
     3,365,000                 BBB/Baa2   Enel Finance International NV,
                                          5.125%, 10/7/19 (144A)                        3,592,642
     2,320,000       8.75       BB+/Ba1   Enel S.p.A., Floating Rate Note,
                                          9/24/73 (144A)                                2,522,691
       716,928                  BB/Baa3   FPL Energy American Wind LLC,
                                          6.639%, 6/20/23 (144A)                          701,777
       132,661                   B-/Ba2   FPL Energy Wind Funding LLC,
                                          6.876%, 6/27/17 (144A)                          127,355
     1,925,000                 BB+/Baa3   Israel Electric Corp., Ltd., 7.25%,
                                          1/15/19 (144A)                                2,139,156
       610,000                 BB+/Baa3   Israel Electric Corp., Ltd., 9.375%,
                                          1/28/20 (144A)                                  739,944
       910,000                     A/A3   Nevada Power Co., 6.5%, 8/1/18                1,077,488
       693,649                    NR/NR   Orcal Geothermal, Inc., 6.21%,
                                          12/30/20 (144A)                                 679,776
     2,690,000                 BBB/Baa3   Public Service Co. of New Mexico,
                                          7.95%, 5/15/18                                3,197,520
     2,200,000       6.25     BBB-/Baa2   Southern California Edison Co.,
                                          Floating Rate Note (Perpetual)                2,277,000
                                                                                    -------------
                                                                                    $  24,204,219
-------------------------------------------------------------------------------------------------
                                          Gas Utilities -- 0.2%
     2,268,712                    A+/A1   Nakilat, Inc., 6.267%,
                                          12/31/33 (144A)                           $   2,382,148
-------------------------------------------------------------------------------------------------
                                          Multi-Utilities -- 0.4%
     5,055,000                BBB+/Baa1   New York State Electric & Gas Corp.,
                                          6.15%, 12/15/17 (144A)                    $   5,606,854
       302,057                    NR/NR   Ormat Funding Corp., 8.25%,
                                          12/30/20                                        289,975
                                                                                    -------------
                                                                                    $   5,896,829
-------------------------------------------------------------------------------------------------
                                          Independent Power Producers &
                                          Energy Traders -- 0.4%
       595,000                  BBB-/NR   Alta Wind Holdings LLC, 7.0%,
                                          6/30/35 (144A)                            $     629,445
     2,105,000                BBB-/Baa3   Kiowa Power Partners LLC,
                                          5.737%, 3/30/21 (144A)                        2,237,133
     1,016,000                  BB+/Ba1   NSG Holdings LLC, 7.75%,
                                          12/15/25 (144A)                               1,082,040


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 55


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                           
                                          Independent Power Producers &
                                          Energy Traders -- (continued)
     2,336,778                BBB-/Baa3   Panoche Energy Center LLC,
                                          6.885%, 7/31/29 (144A)                    $   2,364,048
                                                                                    -------------
                                                                                    $   6,312,666
                                                                                    -------------
                                          Total Utilities                           $  38,795,862
-------------------------------------------------------------------------------------------------
                                          TOTAL CORPORATE BONDS
                                          (Cost $504,916,031)                       $ 536,800,189
-------------------------------------------------------------------------------------------------
                                          U.S. GOVERNMENT AND AGENCY
                                          OBLIGATIONS -- 15.5%
    32,831,712                  AAA/Aaa   Fannie Mae, 3.0%, 8/1/42-12/1/42          $  31,207,681
     5,986,556                  AAA/Aaa   Fannie Mae, 3.5%, 11/1/42-7/1/43              5,955,215
    15,888,775                  AAA/Aaa   Fannie Mae, 4.0%, 7/1/18-2/1/43              16,372,848
    29,297,891                  AAA/Aaa   Fannie Mae, 4.5%, 10/1/35-12/1/43            31,061,723
    11,343,927                  AAA/Aaa   Fannie Mae, 5.0%, 12/1/17-7/1/40             12,327,081
     4,883,373                  AAA/Aaa   Fannie Mae, 5.5%, 9/1/17-6/1/36               5,333,632
     4,736,087                  AAA/Aaa   Fannie Mae, 6.0%, 6/1/16-7/1/38               5,274,301
       984,472                  AAA/Aaa   Fannie Mae, 6.5%, 1/1/15-11/1/37              1,098,661
       123,388                  AAA/Aaa   Fannie Mae, 7.0%, 7/1/21-1/1/32                 138,855
         1,096                  AAA/Aaa   Fannie Mae, 7.5%, 8/1/20                          1,194
        17,852                  AAA/Aaa   Fannie Mae, 8.0%, 2/1/29-5/1/31                  20,609
     2,190,782                    NR/NR   Federal Home Loan Mortgage Corp.,
                                          3.5%, 11/1/28                                 2,293,792
     4,260,000                    NR/NR   Federal Home Loan Mortgage Corp.,
                                          4.0%, 12/1/43                                 4,379,318
       976,116                  AAA/Aaa   Federal Home Loan Mortgage Corp.,
                                          4.5%, 3/1/20-10/1/20                          1,036,868
     4,066,740                  AAA/Aaa   Federal Home Loan Mortgage Corp.,
                                          5.0%, 10/1/20-10/1/38                         4,380,829
     1,692,168                  AAA/Aaa   Federal Home Loan Mortgage Corp.,
                                          5.5%, 12/1/18-11/1/35                         1,838,209
     3,971,022                  AAA/Aaa   Federal Home Loan Mortgage Corp.,
                                          6.0%, 5/1/17-12/1/36                          4,416,170
       418,501                  AAA/Aaa   Federal Home Loan Mortgage Corp.,
                                          6.5%, 11/1/30-4/1/34                            468,995
       473,842                  AAA/Aaa   Federal Home Loan Mortgage Corp.,
                                          7.0%, 8/1/22-11/1/30                            524,044
     1,716,858                  AAA/Aaa   Federal National Mortgage
                                          Association, 5.0%, 8/1/40                     1,873,242
     8,422,896                    NR/NR   Government National Mortgage
                                          Association I, 4.5%, 7/15/33-8/15/41          9,040,184
     1,603,391                  AAA/Aaa   Government National Mortgage
                                          Association I, 5.0%, 10/15/18-4/15/35         1,749,302
     6,813,619                  AAA/Aaa   Government National Mortgage
                                          Association I, 5.5%, 10/15/17-2/15/37         7,505,605


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

56 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                           
                                          U.S. Government and Agency
                                          Obligations -- (continued)
     7,386,099                  AAA/Aaa   Government National Mortgage
                                          Association I, 6.0%,
                                          4/15/14-10/15/36                          $   8,258,096
     3,633,243                  AAA/Aaa   Government National Mortgage
                                          Association I, 6.5%,
                                          1/15/29-7/15/35                               4,108,654
       642,684                  AAA/Aaa   Government National Mortgage
                                          Association I, 7.0%,
                                          4/15/28-10/15/31                                746,777
       108,499                  AAA/Aaa   Government National Mortgage
                                          Association I, 7.5%,
                                          2/15/26-12/15/31                                120,262
         5,105                  AAA/Aaa   Government National Mortgage
                                          Association I, 7.75%, 2/15/30                     5,582
     4,072,188                  AAA/Aaa   Government National Mortgage
                                          Association II, 4.5%,
                                          12/20/34-9/20/41                              4,367,283
     1,490,013                  AAA/Aaa   Government National Mortgage
                                          Association II, 5.5%,
                                          10/20/19-4/20/34                              1,626,932
        51,557                  AAA/Aaa   Government National Mortgage
                                          Association II, 6.5%,
                                          2/20/29-4/20/29                                  58,916
       234,328                  AAA/Aaa   Government National Mortgage
                                          Association II, 7.0%,
                                          11/20/28-12/20/30                               272,486
    10,000,000                   NR/Aaa   U.S. Treasury Bonds, 2.875%, 5/15/43          8,104,690
     1,200,000                   NR/Aaa   U.S. Treasury Bonds, 3.125%, 2/15/43          1,027,500
     7,620,000                  AA+/Aaa   U.S. Treasury Bonds, 4.25%, 5/15/39           8,126,014
     1,365,000                  AA+/Aaa   U.S. Treasury Bonds, 4.375%, 11/15/39         1,483,371
     4,650,000                  AA+/Aaa   U.S. Treasury Bonds, 4.375%, 2/15/38          5,061,237
     2,000,000                  AA+/Aaa   U.S. Treasury Bonds, 4.375%, 5/15/40          2,172,500
     8,435,000                  AA+/Aaa   U.S. Treasury Bonds, 4.5%, 5/15/38            9,352,306
     9,068,000                  AA+/Aaa   U.S. Treasury Bonds, 4.5%, 8/15/39           10,051,316
     4,000,000                  AA+/Aaa   U.S. Treasury Bonds, 4.625%, 2/15/40          4,517,500
     4,000,000                  AA+/Aaa   U.S. Treasury Bonds, 5.375%, 2/15/31          4,901,876
                                                                                    -------------
                                                                                    $ 222,661,656
-------------------------------------------------------------------------------------------------
                                          TOTAL U.S. GOVERNMENT AND
                                          AGENCY OBLIGATIONS
                                          (Cost $219,207,650)                       $ 222,661,656
-------------------------------------------------------------------------------------------------
                                          MUNICIPAL BONDS -- 8.1%
                                          Municipal Airport -- 0.1%
     1,000,000                 BBB/Baa1   Indianapolis Airport Authority,
                                          5.1%, 1/15/17                             $   1,101,530
-------------------------------------------------------------------------------------------------


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 57


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                           
                                          Municipal Development -- 0.7%
     2,925,000                  AA-/Aa3   California Statewide Communities
                                          Development Authority, 6.0%,
                                          8/15/42                                   $   3,271,262
     2,350,000                 BBB/Baa3   Louisiana Local Government
                                          Environmental Facilities & Community
                                          Development Authority, 6.5%, 11/1/35          2,508,296
     2,560,000                 BBB/Baa1   Parish of St. John the Baptist
                                          Louisiana, 5.125%, 6/1/37                     2,510,285
     2,310,000                 BBB/Baa3   Selma Industrial Development
                                          Board, 5.8%, 5/1/34                           2,356,339
                                                                                    -------------
                                                                                    $  10,646,182
-------------------------------------------------------------------------------------------------
                                          Municipal General -- 1.2%
     4,075,000                    AA/A2   JobsOhio Beverage System,
                                          3.985%, 1/1/29                            $   3,719,904
     1,035,000                    AA/A2   JobsOhio Beverage System,
                                          4.532%, 1/1/35                                  958,576
     4,500,000                   AA-/A1   New Jersey Economic Development
                                          Authority, 0.0%, 2/15/18 (d)                  3,934,845
     2,750,000                    A+/A1   New Jersey Transportation Trust Fund
                                          Authority, 5.5%, 6/15/41                      2,857,168
     2,400,000                  AAA/Aa1   New York City Transitional Finance
                                          Authority Future Tax Secured Revenue,
                                          5.0%, 11/1/33                                 2,533,320
     1,050,000                   BBB/A3   Texas Municipal Gas Acquisition &
                                          Supply Corp. III, 5.0%, 12/15/30              1,008,200
     2,100,000                   BBB/A3   Texas Municipal Gas Acquisition &
                                          Supply Corp. III, 5.0%, 12/15/31              2,001,804
                                                                                    -------------
                                                                                    $  17,013,817
-------------------------------------------------------------------------------------------------
                                          Municipal Higher Education -- 3.6%
       525,000                  AA+/Aaa   Amherst College, 3.794%, 11/1/42          $     436,195
     1,025,000                    A+/NR   Baylor University, 4.313%, 3/1/42               894,702
     1,980,000                  AAA/Aaa   California Educational Facilities
                                          Authority, 5.0%, 6/1/43                       2,227,936
     3,000,000                  AAA/Aaa   Connecticut State Health &
                                          Educational Facility Authority,
                                          5.0%, 7/1/40                                  3,173,190
     4,600,000                  AAA/Aaa   Connecticut State Health &
                                          Educational Facility Authority,
                                          5.0%, 7/1/42                                  4,720,336
     2,850,000                  AAA/Aaa   Health & Educational Facilities
                                          Authority of the State of Missouri,
                                          5.0%, 11/15/39                                2,977,082
     2,300,000                  AAA/Aaa   Houston Higher Education Finance
                                          Corp., 4.5%, 11/15/37                         2,302,323
     1,500,000                  AAA/Aaa   Houston Higher Education Finance
                                          Corp., 5.0%, 5/15/40                          1,565,220


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

58 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                           
                                          Municipal Higher
                                          Education -- (continued)
     1,100,000                   AA/Aa1   Illinois Finance Authority,
                                          5.0%, 10/1/51                             $   1,082,917
     1,200,000                  AAA/Aaa   Massachusetts Development Finance
                                          Agency, 5.0%, 10/15/40                        1,279,176
     6,500,000                  AAA/Aaa   Massachusetts Health & Educational
                                          Facilities Authority, 5.5%, 11/15/36          7,192,835
     1,425,000                  AAA/Aaa   Massachusetts Health & Educational
                                          Facilities Authority, 5.5%, 7/1/32            1,731,974
     1,000,000                  AAA/Aaa   Massachusetts Health & Educational
                                          Facilities Authority, 6.0%, 7/1/36            1,120,720
     1,100,000                  AAA/Aaa   Massachusetts Institute of Technology,
                                          5.6%, 7/1/11                                  1,249,475
     1,600,000                   AA/Aa1   New York State Dormitory Authority
                                          Series A, 5.0%, 7/1/40                        1,659,936
     2,590,000                  AAA/Aaa   New York State Dormitory Authority,
                                          5.0%, 10/1/41                                 2,726,467
     2,150,000                   AA/Aa1   New York State Dormitory Authority,
                                          5.0%, 7/1/35                                  2,251,588
       875,000                  AA-/Aa3   New York State Dormitory Authority,
                                          5.0%, 7/1/37                                    911,269
     3,700,000                  AAA/Aaa   New York State Dormitory Authority,
                                          5.0%, 7/1/38                                  3,882,632
       800,000                  AAA/Aaa   Permanent University Fund, 5.0%,
                                          7/1/30                                          896,696
     3,095,000                  AAA/Aaa   President and Fellows of Harvard
                                          College, 6.3%, 10/1/37                        3,424,268
     1,900,000                    A+/A1   The George Washington University,
                                          1.827%, 9/15/17                               1,874,394
       525,000                  AAA/Aaa   The University of Texas System,
                                          5.0%, 8/15/43                                   549,675
     2,600,000                   AA/Aa1   University of California, 3.38%,
                                          5/15/28                                       2,311,946
                                                                                    -------------
                                                                                    $  52,442,952
-------------------------------------------------------------------------------------------------
                                          Municipal Medical -- 0.2%
       325,000                   AA-/A1   Massachusetts Development Finance
                                          Agency, 5.25%, 4/1/37                     $     335,650
       550,000                   AA-/A1   Massachusetts Development Finance
                                          Agency, 5.375%, 4/1/41                          569,811
     1,765,000                  AA-/Aa2   Ohio Higher Educational Facility
                                          Commission, 5.0%, 1/1/42                      1,766,271
                                                                                    -------------
                                                                                    $   2,671,732
-------------------------------------------------------------------------------------------------
                                          Municipal Pollution -- 0.4%
       995,000                  A-/Baa1   County of Sweetwater Wyoming,
                                          5.6%, 12/1/35                             $   1,008,641


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 59


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Municipal Pollution -- (continued)
       980,000                 BBB/Baa3   Courtland Industrial Development
                                          Board, 5.0%, 8/1/27                       $     971,386
     3,965,000       5.95        BBB/NR   Port Freeport Texas, Floating Rate
                                          Note, 5/15/33                                 4,151,593
                                                                                    -------------
                                                                                    $   6,131,620
-------------------------------------------------------------------------------------------------
                                          Municipal Power -- 0.3%
     4,060,000                   AA-/A1   South Carolina State Public Service
                                          Authority, 5.0%, 12/1/43                  $   4,028,657
-------------------------------------------------------------------------------------------------
                                          Municipal Transportation -- 0.2%
     1,600,000                  AA+/Aa2   Metropolitan Transit Authority of Harris
                                          County, 5.0%, 11/1/41                     $   1,651,152
       600,000                  AA-/Aa3   Port Authority of New York & New
                                          Jersey, 4.458%, 10/1/62                         508,704
                                                                                    -------------
                                                                                    $   2,159,856
-------------------------------------------------------------------------------------------------
                                          Municipal Water -- 1.0%
     2,400,000                  AAA/Aa1   City of Charleston South Carolina
                                          Waterworks & Sewer System
                                          Revenue, 5.0%, 1/1/35                     $   2,525,808
     2,800,000                  AAA/Aa1   City of Charleston South Carolina
                                          Waterworks & Sewer System
                                          Revenue, 5.0%, 1/1/41                         2,919,112
     3,275,000                  AA-/Aa3   City of San Francisco California
                                          Public Utilities Commission Water
                                          Revenue, 5.0%, 11/1/37                        3,396,764
       800,000                  AAA/Aa2   Hampton Roads Sanitation District,
                                          5.0%, 4/1/38                                    823,888
     1,415,000                  AAA/Aa1   Metropolitan Water Reclamation
                                          District of Greater Chicago, 5.0%,
                                          12/1/30                                       1,492,471
     1,200,000                  AAA/Aa1   Metropolitan Water Reclamation
                                          District of Greater Chicago, 5.0%,
                                          12/1/32                                       1,251,720
     1,750,000                   AAA/NR   Tarrant Regional Water District,
                                          5.0%, 3/1/52                                  1,779,802
                                                                                    -------------
                                                                                    $  14,189,565
-------------------------------------------------------------------------------------------------
                                          Municipal Obligation -- 0.4%
     1,800,000                  AAA/Aa1   State of Florida, 4.0%, 6/1/27            $   1,833,930
       560,000                  AA+/Aa1   State of Washington, 3.0%, 7/1/28               494,917
     1,660,000                  AA+/Aa1   State of Washington, 5.0%, 7/1/18             1,936,324
     1,400,000                  AA+/Aa1   State of Washington, 5.0%, 8/1/39             1,449,966
                                                                                    -------------
                                                                                    $   5,715,137
-------------------------------------------------------------------------------------------------
                                          TOTAL MUNICIPAL BONDS
                                          (Cost $115,456,175)                       $ 116,101,048
-------------------------------------------------------------------------------------------------


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

60 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          SENIOR FLOATING RATE
                                          LOAN INTERESTS -- 5.3%**
                                          ENERGY -- 0.2%
                                          Integrated Oil & Gas -- 0.1%
     1,636,642       2.74      BBB/Baa2   Glenn Pool Oil & Gas Trust, Term
                                          Loan, 5/2/16                              $   1,655,054
-------------------------------------------------------------------------------------------------
                                          Oil & Gas Refining & Marketing -- 0.1%
     1,438,840       3.75        BB/Ba2   Pilot Travel Centers LLC, Refinancing
                                          Tranche B Term Loan, 3/30/18              $   1,442,204
                                                                                    -------------
                                          Total Energy                              $   3,097,258
-------------------------------------------------------------------------------------------------
                                          MATERIALS -- 0.2%
                                          Commodity Chemicals -- 0.1%
       777,877       4.50        NR/Ba2   Tronox Pigments BV, New Term
                                          Loan, 3/19/20                             $     789,059
-------------------------------------------------------------------------------------------------
                                          Specialty Chemicals -- 0.1%
     1,225,823       3.50       BB+/Ba1   Chemtura Corp., New Term Loan,
                                          8/29/16                                   $   1,231,952
       257,302       3.25       BB+/Ba2   Huntsman International LLC, Extended
                                          Term B Loan, 4/19/17                            257,784
                                                                                    -------------
                                                                                    $   1,489,736
-------------------------------------------------------------------------------------------------
                                          Metal & Glass Containers -- 0.0%+
       420,750       4.50          B/B1   BWAY Holding Co., Initial Term
                                          Loan, 8/31/17                             $     423,818
                                                                                    -------------
                                          Total Materials                           $   2,702,613
-------------------------------------------------------------------------------------------------
                                          CAPITAL GOODS -- 0.5%
                                          Aerospace & Defense -- 0.4%
     1,355,382       6.25         B-/B2   DAE Aviation Holdings, Inc., Tranche
                                          B-1 Loan, 11/2/18                         $   1,369,783
       614,441       6.25          B/B2   DAE Aviation Holdings, Inc., Tranche
                                          B-2 Loan, 11/2/18                               620,970
     1,310,100       3.75      BBB-/Ba2   DigitalGlobe, Inc., Term Loan, 1/25/20        1,316,028
       629,868       6.25        BB-/WR   DynCorp International, Inc., Term
                                          Loan, 7/7/16                                    636,364
       638,625       3.75      BBB-/Ba1   Spirit Aerosystems, Inc., Term B
                                          Loan, 4/18/19                                   643,514
     1,557,237       4.50        BB-/B1   TASC, Inc. Virginia, New Tranche B
                                          Term Loan, 12/18/15                           1,485,864
                                                                                    -------------
                                                                                    $   6,072,523
-------------------------------------------------------------------------------------------------
                                          Trading Companies &
                                          Distributors -- 0.1%
       590,405       4.50        BB/Ba3   WESCO Distribution, Inc., Tranche
                                          B-1 Loan, 12/12/19                        $     592,619
                                                                                    -------------
                                          Total Capital Goods                       $   6,665,142
-------------------------------------------------------------------------------------------------


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 61


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          TRANSPORTATION -- 0.1%
                                          Air Freight & Logistics -- 0.1%
       462,700       0.14       CCC+/B2   CEVA Group Plc, Dollar Tranche B
                                          Pre-Funded Term Loan, 8/31/16             $     450,554
       843,532       5.24       CCC+/B2   CEVA Logistics US Holdings, Inc.,
                                          US Tranche B Term Loan, 8/31/16                 821,389
       351,403       5.24       CCC+/NR   EGL, Inc., EGL Tranche B Term
                                          Loan, 8/31/16                                   344,705
                                                                                    -------------
                                                                                    $   1,616,648
                                                                                    -------------
                                          Total Transportation                      $   1,616,648
-------------------------------------------------------------------------------------------------
                                          AUTOMOBILES & COMPONENTS -- 0.6%
                                          Auto Parts & Equipment -- 0.3%
       212,095       3.17       BB-/Ba3   Allison Transmission, Inc., New Term
                                          B-2 Loan, 8/7/17                          $     212,891
     1,000,252       3.75        B+/Ba3   Allison Transmission, Inc., Term B-3
                                          Loan, 8/23/19                                 1,007,129
       903,052       2.18          B/B1   Federal-Mogul Corp., Tranche B Term
                                          Loan, 12/29/14                                  891,701
       531,440       2.18          B/B1   Federal-Mogul Corp., Tranche C Term
                                          Loan, 12/28/15                                  524,760
       832,373       5.50         NR/NR   TI Group Automotive Systems LLC,
                                          Additional Term Loan, 3/27/19                   838,876
       684,567       3.75        BB/Ba2   Tomkins LLC, Term B-2 Loan, 9/29/16             688,161
                                                                                    -------------
                                                                                    $   4,163,518
-------------------------------------------------------------------------------------------------
                                          Tires & Rubber -- 0.3%
     4,190,000       4.75        BB/Ba1   The Goodyear Tire & Rubber Co., Term
                                          Loan (Second Lien), 3/27/19               $   4,238,449
                                                                                    -------------
                                          Total Automobiles & Components            $   8,401,967
-------------------------------------------------------------------------------------------------
                                          CONSUMER DURABLES &
                                          APPAREL -- 0.0%+
                                          Apparel, Accessories & Luxury
                                          Goods -- 0.0%+
       652,811       3.25      BBB-/Ba1   PVH Corp., Tranche B Term Loan,
                                          12/19/19                                  $     656,891
                                                                                    -------------
                                          Total Consumer Durables & Apparel         $     656,891
-------------------------------------------------------------------------------------------------
                                          CONSUMER SERVICES -- 0.1%
                                          Casinos & Gaming -- 0.1%
     1,044,750       3.75       BB+/Ba2   Pinnacle Entertainment, Inc.,
                                          Tranche B-2 Term Loan, 8/13/20            $   1,051,280
-------------------------------------------------------------------------------------------------
                                          Restaurants -- 0.0%+
       483,875       3.75        BB/Ba3   Burger King Corp., Tranche B Term
                                          Loan (2012), 9/28/19                      $     486,640
                                                                                    -------------
                                          Total Consumer Services                   $   1,537,920
-------------------------------------------------------------------------------------------------


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

62 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          MEDIA -- 0.7%
                                          Advertising -- 0.1%
     1,075,768       6.50         B-/B1   Affinion Group, Inc., Tranche B Term
                                          Loan, 10/9/16                             $   1,062,513
-------------------------------------------------------------------------------------------------
                                          Broadcasting -- 0.2%
     2,288,878       4.50         B+/B2   Univision Communications, Inc.,
                                          2013 Converted Extended First-Lien
                                          Term Loan, 3/1/20                         $   2,304,818
-------------------------------------------------------------------------------------------------
                                          Cable & Satellite -- 0.1%
     1,716,375       3.00      BB+/Baa3   Charter Communications Operating
                                          LLC, Term F Loan, 1/1/21                  $   1,703,931
       197,011       4.75          B/B1   WideOpenWest Finance LLC, Term B
                                          Loan, 4/1/19                                    198,231
                                                                                    -------------
                                                                                    $   1,902,162
-------------------------------------------------------------------------------------------------
                                          Movies & Entertainment -- 0.1%
       595,494       4.50       NR/Baa3   Cinedigm Digital Funding I LLC, Term
                                          Loan, 2/28/18                             $     597,727
     1,421,438       3.50        BB/Ba3   Live Nation Entertainment, Inc.,
                                          Term B-1 Loan, 8/17/20                        1,425,436
                                                                                    -------------
                                                                                    $   2,023,163
-------------------------------------------------------------------------------------------------
                                          Publishing -- 0.2%
     2,241,695       3.75       BB-/Ba3   Interactive Data Corp., Refinanced
                                          Term Loan, 2/11/18                        $   2,248,001
                                                                                    -------------
                                          Total Media                               $   9,540,657
-------------------------------------------------------------------------------------------------
                                          RETAILING -- 0.3%
                                          Automotive Retail -- 0.3%
     3,817,125       4.25        BB/Ba1   Chrysler Group LLC, Term Loan B,
                                          5/24/17                                   $   3,843,356
                                                                                    -------------
                                          Total Retailing                           $   3,843,356
-------------------------------------------------------------------------------------------------
                                          FOOD, BEVERAGE & TOBACCO -- 0.1%
                                          Agricultural Products -- 0.1%
     1,255,000       3.25         NR/NR   Darling International, Inc., Tranche
                                          B-1 (1st Lien) Term Loan, 12/19/20        $   1,267,550
-------------------------------------------------------------------------------------------------
                                          Packaged Foods & Meats -- 0.0%+
        23,820       3.25       BB-/Ba3   Pinnacle Foods Finance LLC, New Term
                                          Loan G, 4/29/20                           $      23,831
                                                                                    -------------
                                          Total Food, Beverage & Tobacco            $   1,291,381
-------------------------------------------------------------------------------------------------
                                          HOUSEHOLD & PERSONAL
                                          PRODUCTS -- 0.1%
                                          Household Products -- 0.0%+
       161,200       5.25         B-/B2   WASH Multifamily Laundry Systems
                                          LLC, U.S. Term Loan, 2/21/19              $     161,804
-------------------------------------------------------------------------------------------------


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 63


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Personal Products -- 0.1%
       861,429       3.50       BB-/Ba3   NBTY, Inc., Term B-2 Loan, 10/1/17        $     868,787
                                                                                    -------------
                                          Total Household & Personal Products       $   1,030,591
-------------------------------------------------------------------------------------------------
                                          HEALTH CARE EQUIPMENT &
                                          SERVICES -- 0.8%
                                          Health Care Equipment -- 0.0%+
       561,679       3.75      BBB-/Ba2   Hologic, Inc., Refinancing Tranche B
                                          Term Loan, 8/1/19                         $     565,892
-------------------------------------------------------------------------------------------------
                                          Health Care Supplies -- 0.2%
     2,155,745       5.00        BB-/B1   Immucor, Inc., Term B-2 Loan, 8/19/18     $   2,170,117
-------------------------------------------------------------------------------------------------
                                          Health Care Services -- 0.1%
       544,500       6.75         B+/B1   Ardent Medical Services, Inc., 1st Lien
                                          Term Loan, 5/2/18                         $     547,450
       388,000       4.50       BB-/Ba2   DaVita HealthCare Partners, Inc.,
                                          Tranche B Term Loan, 10/20/16                   391,334
                                                                                    -------------
                                                                                    $     938,784
-------------------------------------------------------------------------------------------------
                                          Health Care Facilities -- 0.5%
     2,199,732       3.74        BB/Ba2   CHS, Extended Term Loan, 1/25/17          $   2,218,979
       746,030       3.00        BB/Ba3   HCA, Inc., Tranche B-4 Term Loan,
                                          5/1/18                                          747,633
     1,789,129       3.00        BB/Ba3   HCA, Inc., Tranche B-5 Term Loan,
                                          3/31/17                                       1,792,623
     1,621,095       3.50       BB-/Ba3   Health Management Associates, Inc.,
                                          Replacement Term B Loan, 11/16/18             1,623,122
       704,687       2.42       BB+/Ba2   Universal Health Services, Inc.,
                                          Tranche B-1 Term Loan, 11/15/16                 708,651
                                                                                    -------------
                                                                                    $   7,091,008
-------------------------------------------------------------------------------------------------
                                          Health Care Technology -- 0.0%+
       457,240       3.75        BB-/Ba3  IMS Health, Inc., Tranche B-1 Dollar Term
                                          Loan, 9/1/17                              $     459,755
                                                                                    -------------
                                          Total Health Care Equipment
                                          & Services                                $  11,225,556
-------------------------------------------------------------------------------------------------
                                          PHARMACEUTICALS, BIOTECHNOLOGY
                                          & LIFE SCIENCES -- 0.4%
                                          Biotechnology -- 0.0%+
       998,324       4.25       BB+/Ba1   Grifols, Inc., New U.S. Tranche B Term
                                          Loan, 6/1/17                              $   1,005,951
-------------------------------------------------------------------------------------------------
                                          Pharmaceuticals -- 0.2%
     1,688,978       0.00         NR/NR   Royalty Pharma, Tranche B-2 Term
                                          Loan, 5/9/18                              $   1,695,663
       152,673       4.00       BB+/Ba1   Endo Health Solutions, Inc., Term
                                          Loan B 2011, 6/17/18                            153,016


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

64 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Pharmaceuticals -- (continued)
       617,188       3.75        BB/Ba1   Valeant Pharmaceuticals International,
                                          Inc., Series C-2 Tranche B Term
                                          Loan, 12/11/19                            $     622,533
                                                                                    -------------
                                                                                    $   2,471,212
-------------------------------------------------------------------------------------------------
                                          Life Sciences Tools & Services -- 0.2%
     2,686,866       3.74       BB-/Ba3   Catalent Pharma Solutions, Inc.,
                                          Refinancing Dollar Term-1 (2016),
                                          9/15/16                                   $   2,703,100
                                                                                    -------------
                                          Total Pharmaceuticals,
                                          Biotechnology & Life Sciences             $   6,180,263
-------------------------------------------------------------------------------------------------
                                          DIVERSIFIED FINANCIALS -- 0.1%
                                          Other Diversified
                                          Financial Services -- 0.1%
       999,288       5.75        BB/Ba3   WorldPay, Facility B2A Term Loan,
                                          8/6/17                                    $   1,011,029
                                                                                    -------------
                                          Total Diversified Financials              $   1,011,029
-------------------------------------------------------------------------------------------------
                                          INSURANCE -- 0.4%
                                          Insurance Brokers -- 0.4%
     6,271,769       4.25         NR/NR   USI Insurance Services, Tranche B
                                          Term Loan, 12/30/19                       $   6,310,967
                                                                                    -------------
                                          Total Insurance                           $   6,310,967
-------------------------------------------------------------------------------------------------
                                          SOFTWARE & SERVICES -- 0.2%
                                          Internet Software & Services -- 0.1%
     1,380,950       4.00       BB+/Ba3   AutoTrader.com, Inc., Tranche B-1
                                          Term Loan, 12/15/16                       $   1,390,013
-------------------------------------------------------------------------------------------------
                                          IT Consulting & Other Services -- 0.1%
     1,017,010       3.92        BB/Ba3   SunGard Data Systems, Inc., Tranche C
                                          Term Loan, 2/28/17                        $   1,022,413
-------------------------------------------------------------------------------------------------
                                          Application Software -- 0.0%+
       374,505       3.00      BB+/Baa3   Nuance Communications, Inc., Term C
                                          Loan, 8/7/19                              $     372,866
-------------------------------------------------------------------------------------------------
                                          Systems Software -- 0.0%+
       119,969       2.17        BB/Ba3   The Reynolds & Reynolds Co.,
                                          Tranche B Term Loan, 4/21/16              $     120,455
                                                                                    -------------
                                          Total Software & Services                 $   2,905,747
-------------------------------------------------------------------------------------------------
                                          TECHNOLOGY HARDWARE &
                                          EQUIPMENT -- 0.0%+
                                          Communications Equipment -- 0.0%+
       330,657       0.00         NR/NR   CommScope Inc., Tranche B (1st Lien)
                                          Term Loan, 1/21/17                        $     332,311


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 65


Schedule of Investments | 12/31/13 (unaudited) (continued)



-------------------------------------------------------------------------------------------------
Principal        Floating   S&P/Moody's
Amount ($)       Rate (b)   Ratings                                                 Value
-------------------------------------------------------------------------------------------------
                                                                        
                                          Communications
                                          Equipment -- (continued)
       495,986       3.25         NR/NR   CommScope Inc., Tranche B Term
                                          Loan, 1/14/18                             $     500,016
                                                                                    -------------
                                                                                    $     832,327
                                                                                    -------------
                                          Total Technology Hardware
                                          & Equipment                               $     832,327
-------------------------------------------------------------------------------------------------
                                          SEMICONDUCTORS &
                                          SEMICONDUCTOR EQUIPMENT -- 0.3%
                                          Semiconductor Equipment -- 0.2%
     3,048,411       4.50         NR/B1   Aeroflex, Inc., Tranche B-1 Term
                                          Loan, 11/9/19                             $   3,078,566
-------------------------------------------------------------------------------------------------
                                          Semiconductors -- 0.1%
       826,238       2.99        BB+/WR   Microsemi Corp., Term Loan, 2/19/20       $     831,402
                                                                                    -------------
                                          Total Semiconductors &
                                          Semiconductor Equipment                   $   3,909,968
-------------------------------------------------------------------------------------------------
                                          TELECOMMUNICATION
                                          SERVICES -- 0.1%
                                          Integrated Telecommunication
                                          Services -- 0.1%
     1,950,113       4.00       BB-/Ba3   Cincinnati Bell, Inc., Tranche B Term
                                          Loan, 9/10/20                             $   1,956,729
                                                                                    -------------
                                          Total Telecommunication Services          $   1,956,729
-------------------------------------------------------------------------------------------------
                                          UTILITIES -- 0.1%
                                          Independent Power Producers &
                                          Energy Traders -- 0.1%
     1,335,930       2.75      BB+/Baa3   NRG Energy, Inc., Term Loan
                                          (2013), 7/1/18                            $   1,334,631
       793,416       4.75       BB+/Ba1   NSG Holdings LLC, New Term
                                          Loan, 12/11/19                                  807,301
                                                                                    -------------
                                                                                    $   2,141,932
                                                                                    -------------
                                          Total Utilities                           $   2,141,932
-------------------------------------------------------------------------------------------------
                                          TOTAL SENIOR FLOATING RATE
                                          LOAN INTERESTS
                                          (Cost $75,306,955)                        $  76,858,942
-------------------------------------------------------------------------------------------------


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

66 Pioneer Bond Fund | Semiannual Report | 12/31/13




-------------------------------------------------------------------------------------------------
Shares                                                                             Value
-------------------------------------------------------------------------------------------------
                                                                             
                                          RIGHTS / WARRANTS -- 0.0%+
                                          AUTOMOBILES &
                                          COMPONENTS -- 0.0%+
                                          Auto Parts & Equipment -- 0.0%+
           247                            Lear Corp., 11/9/14                      $       40,273
-------------------------------------------------------------------------------------------------
                                          TOTAL RIGHTS / WARRANTS
                                          (Cost $13,341)                           $       40,273
-------------------------------------------------------------------------------------------------
                                          TOTAL INVESTMENT IN
                                          SECURITIES -- 98.0%
                                          (Cost $1,364,497,599) (a)                $1,407,628,284
-------------------------------------------------------------------------------------------------
                                          OTHER ASSETS & LIABILITIES -- 2.0%       $   29,200,065
-------------------------------------------------------------------------------------------------
                                          TOTAL NET ASSETS -- 100.0%               $1,436,828,349
=================================================================================================


NR            Not rated by either S&P or Moody's.

WR            Withdrawn rating.

REIT          Real Estate Investment Trust.

+             Rounds to less than 0.01%.

(Perpetual)   Security with no stated maturity date.

(Cat Bond)    Catastrophe bond is a high-yield debt instrument that is usually
              insurance linked and meant to raise money in case of a
              catastrophe.

(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 December 31, 2013, the value of these securities
              amounted to $383,015,667 or 26.7% 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 December 31, 2013, the net unrealized appreciation on
              investments based on cost for federal income tax purposes of
              $1,367,115,146 was as follows:



                                                                                   
              Aggregate gross unrealized appreciation for all investments in which
                 there is an excess of value over tax cost                            $ 63,373,336

              Aggregate gross unrealized depreciation for all investments in which
                 there is an excess of tax cost over value                             (22,860,198)
                                                                                      ------------
              Net unrealized appreciation                                             $ 40,513,138
                                                                                      ============


(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.

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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 67


Schedule of Investments | 12/31/13 (unaudited) (continued)

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

Purchases and sales of securities (excluding temporary cash investments) for the
six months ended December 31, 2013 were as follows:



              -----------------------------------------------------------------------------
                                                               Purchases       Sales
              -----------------------------------------------------------------------------
                                                                         
              Long-Term U.S. Government Securities             $17,112,310     $116,962,024
              Other Long-Term Securities                       $92,061,322     $180,977,296


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) as Level 3. See
Notes to Financial Statements -- Note 1A.

The following is a summary of the inputs used as of December 31, 2013, in
valuing the Fund's assets:



----------------------------------------------------------------------------------------------------
                                   Level 1         Level 2             Level 3        Total
----------------------------------------------------------------------------------------------------
                                                                          
Convertible Corporate Bonds        $         --    $      11,647,500   $         --   $   11,647,500
Preferred Stocks                     27,286,440            6,503,300      3,296,244       37,085,984
Convertible Preferred Stocks          6,199,050                   --             --        6,199,050
Asset Backed Securities                      --          123,364,977             --      123,364,977
Collateralized Mortgage
   Obligations                               --          276,868,665             --      276,868,665
Corporate Bonds                              --          536,000,134        800,055      536,800,189
U.S. Government Agency
   Obligations                               --          222,661,656             --      222,661,656
Municipal Bonds                              --          116,101,048             --      116,101,048
Senior Floating Rate Loan
   Interests                                 --           76,858,942             --       76,858,942
Rights/Warrants                          40,273                   --             --           40,273
----------------------------------------------------------------------------------------------------
Total                              $ 33,525,763    $   1,370,006,222   $  4,096,299   $1,407,628,284
====================================================================================================
Other Financial Instruments
Unrealized Appreciation on
   Futures Contracts               $    798,907                   --             --   $      798,907
----------------------------------------------------------------------------------------------------
Total Other Financial
   Instruments                     $    798,907    $              --   $         --   $      798,907
====================================================================================================


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

68 Pioneer Bond Fund | Semiannual Report | 12/31/13


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



----------------------------------------------------------------------------------------------------
                                                        Preferred         Corporate
                                                        Stocks            Bonds           Total
----------------------------------------------------------------------------------------------------
                                                                                 
Balance as of 6/30/13                                   $2,241,535        $787,549        $3,029,084
Realized gain (loss)(1)                                         --              --                --
Change in unrealized appreciation (depreciation)(2)        154,709          12,506           167,215
Net purchases (sales)                                      900,000              --           900,000
Transfers in and out of Level 3**                               --              --                --
----------------------------------------------------------------------------------------------------
Balance as of 12/31/13                                  $3,296,244        $800,055        $4,096,299
====================================================================================================


(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 six months ended December 31, 2013, there were no transfers
    between Levels 1, 2 and 3.



                                                                                   
    Net change in unrealized appreciation (depreciation) of investments still held
    as of 12/31/13                                                                    $ 167,215
                                                                                      ---------


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 69


Statement of Assets and Liabilities | 12/31/13 (unaudited)



                                                              
ASSETS:
  Investment in securities (cost $1,364,497,599)                 $1,407,628,284
  Cash                                                               26,651,948
  Futures Collateral                                                    279,447
  Receivables --
     Investment securities sold                                          81,694
     Fund shares sold                                                 5,084,576
     Interest                                                        11,002,513
     Dividends                                                          223,478
     Due from Pioneer Investment Management, Inc.                       112,889
  Net unrealized appreciation on futures contracts                      798,907
  Other assets                                                           77,358
--------------------------------------------------------------------------------
        Total assets                                             $1,451,941,094
--------------------------------------------------------------------------------
LIABILITIES:
  Payables --
     Investment securities purchased                             $    8,823,635
     Fund shares repurchased                                          3,745,392
     Dividends                                                        2,006,323
  Due to affiliates                                                     381,258
  Accrued expenses                                                      156,137
--------------------------------------------------------------------------------
        Total liabilities                                        $   15,112,745
--------------------------------------------------------------------------------
NET ASSETS:
  Paid-in capital                                                $1,413,033,890
  Distributions in excess of net investment income                   (3,868,432)
  Accumulated net realized loss on investments
     and futures contracts                                          (16,266,701)
  Net unrealized appreciation on investments                         43,130,685
  Net unrealized appreciation on futures contracts                      798,907
--------------------------------------------------------------------------------
        Total net assets                                         $1,436,828,349
================================================================================
NET ASSET VALUE PER SHARE:
(No par value, unlimited number of shares authorized)
  Class A (based on $533,803,989/55,619,338 shares)              $         9.60
  Class B (based on $6,837,231/716,805 shares)                   $         9.54
  Class C (based on $75,376,023/7,941,284 shares)                $         9.49
  Class K (based on $1,246,785/129,885 shares)                   $         9.60
  Class R (based on $36,041,603/3,721,913 shares)                $         9.68
  Class Y (based on $779,899,089/82,022,429 shares)              $         9.51
  Class Z (based on $3,623,629/376,646 shares)                   $         9.62
MAXIMUM OFFERING PRICE:
  Class A ($9.60 / 95.5% )                                       $        10.05
================================================================================


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

70 Pioneer Bond Fund | Semiannual Report | 12/31/13


Statement of Operations (unaudited)

For the Six Months Ended 12/31/13



                                                                             
INVESTMENT INCOME:
  Interest                                                          $ 32,774,834
  Dividends                                                            1,225,066
------------------------------------------------------------------------------------------------
         Total investment income                                                   $ 33,999,900
------------------------------------------------------------------------------------------------
EXPENSES:
  Management fees                                                   $  3,588,172
  Transfer agent fees
     Class A                                                             143,558
     Class B                                                              16,929
     Class C                                                              18,714
     Class K                                                                  76
     Class R                                                               4,271
     Class Y                                                              28,390
     Class Z                                                               2,526
  Distribution fees
     Class A                                                             692,915
     Class B                                                              38,859
     Class C                                                             402,348
     Class R                                                              83,078
  Shareholder communications expense                                     919,150
  Administrative reimbursements                                          227,879
  Custodian fees                                                          53,675
  Registration fees                                                       53,401
  Professional fees                                                       52,367
  Printing expense                                                        20,685
  Fees and expenses of nonaffiliated Trustees                             23,782
  Miscellaneous                                                           56,040
------------------------------------------------------------------------------------------------
         Total expenses                                                            $  6,426,815
         Less fees waived and expenses reimbursed
            by Pioneer Investment Management, Inc.                                     (449,795)
------------------------------------------------------------------------------------------------
         Net expenses                                                              $  5,977,020
------------------------------------------------------------------------------------------------
            Net investment income                                                  $ 28,022,880
------------------------------------------------------------------------------------------------
REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS,
FUTURES CONTRACTS AND CREDIT DEFAULT SWAPS:
  Net realized gain on:
     Investments                                                    $  4,023,482
     Futures contracts                                                    37,482
     Credit default swaps                                                229,371   $  4,290,335
------------------------------------------------------------------------------------------------
  Change in net unrealized appreciation on:
     Investments                                                    $(12,897,861)
     Futures contracts                                                   442,783
     Credit default swaps                                               (195,506)  $(12,650,584)
------------------------------------------------------------------------------------------------
  Net loss on investments, futures contracts and credit
     default swaps                                                                 $ (8,360,249)
------------------------------------------------------------------------------------------------
  Net increase in net assets resulting from operations                             $ 19,662,631
================================================================================================


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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 71


Statements of Changes in Net Assets



------------------------------------------------------------------------------------------------------
                                                                 Six Months
                                                                 Ended
                                                                 12/31/13              Year Ended
                                                                 (unaudited)           6/30/13
------------------------------------------------------------------------------------------------------
                                                                                 
FROM OPERATIONS:
Net investment income                                            $   28,022,880        $   60,853,512
Net realized gain (loss) on investments, futures
  contracts and credit default swaps                                  4,290,335              (151,123)
Change in net unrealized appreciation (depreciation)
  on investments, futures contracts and credit
  default swaps                                                     (12,650,584)          (14,758,493)
------------------------------------------------------------------------------------------------------
      Net increase in net assets resulting from operations       $   19,662,631        $   45,943,896
------------------------------------------------------------------------------------------------------
DISTRIBUTIONS TO SHAREOWNERS:
Net investment income:
      Class A ($0.21 and $0.37 per share, respectively)          $  (11,879,900)       $  (19,971,054)
      Class B ($0.16 and $0.27 per share, respectively)                (124,299)             (315,610)
      Class C ($0.17 and $0.29 per share, respectively)              (1,372,700)           (2,893,417)
      Class K ($0.23 and $0.21 per share, respectively)                  (2,037)                 (215)
      Class R ($0.19 and $0.34 per share, respectively)                (661,143)             (922,219)
      Class Y ($0.22 and $0.39 per share, respectively)             (17,921,697)          (36,953,978)
      Class Z ($0.22 and $0.40 per share, respectively)                 (85,160)             (201,696)
------------------------------------------------------------------------------------------------------
      Total distributions to shareowners                         $  (32,046,936)       $  (61,258,189)
------------------------------------------------------------------------------------------------------
FROM FUND SHARE TRANSACTIONS:
Net proceeds from sale or exchange of shares                     $  205,942,004        $  622,314,487
Reinvestment of distributions                                        25,721,298            46,411,448
Cost of shares repurchased                                         (397,836,986)         (471,635,739)
------------------------------------------------------------------------------------------------------
      Net increase (decrease) in net assets resulting from
         Fund share transactions                                 $ (166,173,684)       $  197,090,196
------------------------------------------------------------------------------------------------------
      Net increase (decrease) in net assets                      $ (178,557,989)       $  181,775,903
NET ASSETS:
Beginning of period                                               1,615,386,338         1,433,610,435
------------------------------------------------------------------------------------------------------
End of period                                                    $1,436,828,349        $1,615,386,338
======================================================================================================
Undistributed (distributions in excess of) net
  investment income                                              $   (3,868,432)       $      155,624
======================================================================================================


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

72 Pioneer Bond Fund | Semiannual Report | 12/31/13




----------------------------------------------------------------------------------------------------------
                                       '13 Shares       '13 Amount
                                       (unaudited)      (unaudited)         '13 Shares      '13 Amount
----------------------------------------------------------------------------------------------------------
                                                                                
Class A
Shares sold                              8,782,544      $   85,059,586       24,375,983     $ 241,840,642
Reinvestment of distributions            1,131,194          10,907,239        1,779,061        17,627,684
Less shares repurchased                (12,762,901)       (122,866,715)     (14,312,751)     (141,497,556)
----------------------------------------------------------------------------------------------------------
      Net increase (decrease)           (2,849,163)     $  (26,899,890)      11,842,293     $ 117,970,770
==========================================================================================================
Class B
Shares exchanged                            10,730      $      102,793           88,345     $     868,374
Reinvestment of distributions               10,899             104,414           28,586           281,456
Less shares repurchased                   (220,632)         (2,112,382)        (538,851)       (5,303,792)
----------------------------------------------------------------------------------------------------------
      Net decrease                        (199,003)     $   (1,905,175)        (421,920)    $  (4,153,962)
==========================================================================================================
Class C
Shares sold                                513,697      $    4,898,305        2,835,146     $  27,818,936
Reinvestment of distributions              106,781           1,017,900          216,666         2,124,028
Less shares repurchased                 (1,852,815)        (17,663,544)      (3,614,367)      (35,367,504)
----------------------------------------------------------------------------------------------------------
      Net decrease                      (1,232,337)     $  (11,747,339)        (562,555)    $  (5,424,540)
==========================================================================================================
Class K*
Shares sold                                129,697      $    1,246,978            1,007     $      10,000
Reinvestment of distributions                  195               1,873               --                --
Less shares repurchased                     (1,014)             (9,807)              --                --
----------------------------------------------------------------------------------------------------------
      Net increase                         128,878      $    1,239,044            1,007     $      10,000
==========================================================================================================
Class R
Shares sold                              1,190,901      $   11,589,809        1,825,311     $  18,270,357
Reinvestment of distributions               63,893             621,307           83,994           839,417
Less shares repurchased                   (726,421)         (7,069,557)      (1,149,162)      (11,490,246)
----------------------------------------------------------------------------------------------------------
      Net increase                         528,373      $    5,141,559          760,143     $   7,619,528
==========================================================================================================
Class Y
Shares sold                             10,697,844      $  102,335,589       33,476,220     $ 328,848,985
Reinvestment of distributions            1,359,422          12,985,647        2,580,484        25,341,202
Less shares repurchased                (25,644,181)       (245,098,200)     (28,264,359)     (276,929,646)
----------------------------------------------------------------------------------------------------------
      Net increase (decrease)          (13,586,915)     $ (129,776,964)       7,792,345     $  77,260,541
==========================================================================================================
Class Z
Shares sold                                 73,262      $      708,944          468,315     $   4,657,193
Reinvestment of distributions                8,579              82,918           19,896           197,661
Less shares repurchased                   (312,465)         (3,016,781)        (106,004)       (1,046,995)
----------------------------------------------------------------------------------------------------------
      Net increase (decrease)             (230,624)     $   (2,224,919)         382,207     $   3,807,859
==========================================================================================================


* Class K shares were first publicly offered on December 20, 2012.

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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 73


Financial Highlights



------------------------------------------------------------------------------------------------------------------------------------
                                                               Six Months
                                                               Ended        Year       Year       Year       Year       Year
                                                               12/31/13     Ended      Ended      Ended      Ended      Ended
                                                               (unaudited)  6/30/13    6/30/12    6/30/11    6/30/10    6/30/09
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                      
Class A
Net asset value, beginning of period                           $   9.67     $   9.73   $   9.66   $   9.44   $   8.63   $   9.10
------------------------------------------------------------------------------------------------------------------------------------
Increase from investment operations:
   Net investment income                                       $   0.18     $   0.38   $   0.42   $   0.45   $   0.45   $   0.50
   Net realized and unrealized gain (loss) on investments         (0.04)       (0.07)      0.13       0.21       0.80      (0.31)
------------------------------------------------------------------------------------------------------------------------------------
Net increase from investment operations                        $   0.14     $   0.31   $   0.55   $   0.66   $   1.25   $   0.19
------------------------------------------------------------------------------------------------------------------------------------
Distributions to shareowners:
   Net investment income                                       $  (0.21)    $  (0.37)  $  (0.43)  $  (0.44)  $  (0.44)  $  (0.55)
   Net realized gain                                                 --           --      (0.05)        --         --      (0.11)
------------------------------------------------------------------------------------------------------------------------------------
Total distributions                                            $  (0.21)    $  (0.37)  $  (0.48)  $  (0.44)  $  (0.44)  $  (0.66)
------------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                     $  (0.07)    $  (0.06)  $   0.07   $   0.22   $   0.81   $  (0.47)
------------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                 $   9.60     $   9.67   $   9.73   $   9.66   $   9.44   $   8.63
====================================================================================================================================
Total return*                                                      1.47%        3.21%      5.91%      7.08%     14.71%      2.65%
Ratio of net expenses to average net assets                        0.85%**      0.85%      0.85%      0.85%      0.85%      0.89%(a)
Ratio of net investment income to average net assets               3.74%**      3.77%      4.35%      4.63%      4.86%      5.88%
Portfolio turnover rate                                              15%**        28%        21%        36%        41%        34%
Net assets, end of period (in thousands)                       $533,804     $565,569   $453,772   $500,905   $420,706   $320,036
Ratios with no waiver of fees and assumption of expenses by
   the Adviser and no reduction for fees paid indirectly:
   Total expenses                                                  1.00%**      1.01%      1.03%      1.06%      1.07%      1.09%
   Net investment income                                           3.59%**      3.61%      4.17%      4.42%      4.64%      5.68%
====================================================================================================================================


*   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.

**  Annualized.

(a) On October 1, 2008, Pioneer contractually lowered Class A shares' expense
    limitation from 1.00% to 0.85% of the average daily net assets attributable
    to Class A shares. The expense limit will be in effect through November 1,
    2015.

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

74 Pioneer Bond Fund | Semiannual Report | 12/31/13




---------------------------------------------------------------------------------------------------------------------------
                                                              Six Months
                                                              Ended        Year      Year      Year      Year      Year
                                                              12/31/13     Ended     Ended     Ended     Ended     Ended
                                                              (unaudited)  6/30/13   6/30/12   6/30/11   6/30/10   6/30/09
---------------------------------------------------------------------------------------------------------------------------
                                                                                                 
Class B
Net asset value, beginning of period                          $  9.61      $  9.67   $  9.60   $  9.38   $  8.58   $  9.05
---------------------------------------------------------------------------------------------------------------------------
Increase from investment operations:
   Net investment income                                      $  0.13      $  0.27   $  0.31   $  0.35   $  0.35   $  0.42
   Net realized and unrealized gain (loss) on investments       (0.04)       (0.06)     0.14      0.21      0.79     (0.31)
---------------------------------------------------------------------------------------------------------------------------
Net increase from investment operations                       $  0.09      $  0.21   $  0.45   $  0.56   $  1.14   $  0.11
---------------------------------------------------------------------------------------------------------------------------
Distributions to shareowners:
   Net investment income                                      $ (0.16)     $ (0.27)  $ (0.33)  $ (0.34)  $ (0.34)  $ (0.47)
   Net realized gain                                               --           --     (0.05)       --        --     (0.11)
---------------------------------------------------------------------------------------------------------------------------
Total distributions                                           $ (0.16)     $ (0.27)  $ (0.38)  $ (0.34)  $ (0.34)  $ (0.58)
---------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                    $ (0.07)     $ (0.06)  $  0.07   $  0.22   $  0.80   $ (0.47)
---------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                $  9.54      $  9.61   $  9.67   $  9.60   $  9.38   $  8.58
===========================================================================================================================
Total return*                                                    0.94%        2.15%     4.82%     5.99%    13.47%     1.62%
Ratio of net expenses to average net assets                      1.90%**      1.90%     1.90%     1.90%     1.90%     1.90%
Ratio of net investment income to average net assets             2.70%**      2.78%     3.31%     3.59%     3.89%     4.90%
Portfolio turnover rate                                            15%**        28%       21%       36%       41%       34%
Net assets, end of period (in thousands)                      $ 6,837      $ 8,805   $12,942   $18,474   $27,342   $31,738
Ratios with no waiver of fees and assumption of expenses by
   the Adviser and no reduction for fees paid indirectly:
   Total expenses                                                2.13%**      2.05%     2.02%     1.95%     1.98%     1.99%
   Net investment income                                         2.46%**      2.63%     3.19%     3.54%     3.81%     4.81%
===========================================================================================================================


*   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.

**  Annualized.

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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 75


Financial Highlights (continued)



----------------------------------------------------------------------------------------------------------------------------------
                                                                    Six Months
                                                                    Ended         Year      Year      Year      Year      Year
                                                                    12/31/13      Ended     Ended     Ended     Ended     Ended
                                                                    (unaudited)   6/30/13   6/30/12   6/30/11   6/30/10   6/30/09
----------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
Class C
Net asset value, beginning of period                                $  9.57       $  9.63   $  9.55   $  9.34   $  8.54   $  9.02
----------------------------------------------------------------------------------------------------------------------------------
Increase from investment operations:
   Net investment income                                            $  0.14       $  0.29   $  0.33   $  0.36   $  0.37   $  0.42
   Net realized and unrealized gain (loss) on investments             (0.05)        (0.06)     0.15      0.20      0.78     (0.31)
----------------------------------------------------------------------------------------------------------------------------------
Net increase from investment operations                             $  0.09       $  0.23   $  0.48   $  0.56   $  1.15   $  0.11
----------------------------------------------------------------------------------------------------------------------------------
Distributions to shareowners:
   Net investment income                                            $ (0.17)      $ (0.29)  $ (0.35)  $ (0.35)  $ (0.35)  $ (0.48)
   Net realized gain                                                     --            --     (0.05)       --        --     (0.11)
----------------------------------------------------------------------------------------------------------------------------------
Total distributions                                                 $ (0.17)      $ (0.29)  $ (0.40)  $ (0.35)  $ (0.35)  $ (0.59)
----------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                          $ (0.08)      $ (0.06)  $  0.08   $  0.21   $  0.80   $ (0.48)
----------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                      $  9.49       $  9.57   $  9.63   $  9.55   $  9.34   $  8.54
==================================================================================================================================
Total return*                                                          0.92%         2.33%     5.12%     6.06%    13.63%     1.62%
Ratio of net expenses to average net assets                            1.71%**       1.72%     1.73%     1.73%     1.79%     1.83%
Ratio of net investment income to average net assets                   2.89%**       2.93%     3.47%     3.75%     3.91%     4.93%
Portfolio turnover rate                                                  15%**         28%       21%       36%       41%       34%
Net assets, end of period (in thousands)                            $75,376       $87,763   $93,737   $82,915   $81,892   $53,045
Ratios with no waiver of fees and assumption of expenses by the
   Adviser and no reduction for fees paid indirectly:
   Total expenses                                                      1.71%**       1.72%     1.73%     1.73%     1.79%     1.83%
   Net investment income                                               2.89%**       2.93%     3.47%     3.75%     3.91%     4.93%
==================================================================================================================================


*   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.

**  Annualized.

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

76 Pioneer Bond Fund | Semiannual Report | 12/31/13




--------------------------------------------------------------------------------------------------------
                                                                              Six Months
                                                                              Ended         12/20/12 (a)
                                                                              12/31/13      to
                                                                              (unaudited)   6/30/13
--------------------------------------------------------------------------------------------------------
                                                                                      
Class K
Net asset value, beginning of period                                          $  9.67       $  9.94
--------------------------------------------------------------------------------------------------------
Decrease from investment operations:
  Net investment income                                                       $  0.21       $  0.20
  Net realized and unrealized loss on investments                               (0.05)        (0.26)
--------------------------------------------------------------------------------------------------------
Net decrease from investment operations                                       $  0.16       $ (0.06)
--------------------------------------------------------------------------------------------------------
Distributions to shareowners:
  Net investment income                                                       $ (0.23)      $ (0.21)
--------------------------------------------------------------------------------------------------------
Net decrease in net asset value                                               $ (0.07)      $ (0.27)
--------------------------------------------------------------------------------------------------------
Net asset value, end of period                                                $  9.60       $  9.67
========================================================================================================
Total return*                                                                    1.62%        (0.61)%(b)
Ratio of net expenses to average net assets                                      0.80%**       0.57%**
Ratio of net investment income to average net assets                             2.47%**       3.86%**
Portfolio turnover rate                                                            15%**         28%**
Net assets, end of period (in thousands)                                      $ 1,247       $    10
Ratios with no waiver of fees and assumption of expenses by the Adviser and
  no reduction for fees paid indirectly:
  Total expenses                                                                 0.80%**       0.57%**
  Net investment income                                                          2.47%**       3.86%**
========================================================================================================


*   Assumes initial investment at net asset value at the beginning of each
    period, reinvestment of all distributions, and the complete redemption of
    the investment at net asset value at the end of each period.

(a) Class K shares were first publicly offered on December 20, 2012.

(b) Not annualized.

**  Annualized.

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

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 77


Financial Highlights (continued)



------------------------------------------------------------------------------------------------------------------------------
                                                                 Six Months
                                                                 Ended        Year      Year      Year      Year      Year
                                                                 12/31/13     Ended     Ended     Ended     Ended     Ended
                                                                 (unaudited)  6/30/13   6/30/12   6/30/11   6/30/10   6/30/09
------------------------------------------------------------------------------------------------------------------------------
                                                                                                       
Class R
Net asset value, beginning of period                             $  9.76      $  9.82   $  9.74   $  9.52   $  8.71   $  9.18
------------------------------------------------------------------------------------------------------------------------------
Increase from investment operations:
   Net investment income                                         $  0.16      $  0.34   $  0.39   $  0.41   $  0.42   $  0.48
   Net realized and unrealized gain (loss) on investments          (0.05)       (0.06)     0.14      0.22      0.80     (0.31)
------------------------------------------------------------------------------------------------------------------------------
Net increase from investment operations                          $  0.11      $  0.28   $  0.53   $  0.63   $  1.22   $  0.17
------------------------------------------------------------------------------------------------------------------------------
Distributions to shareowners:
   Net investment income                                         $ (0.19)     $ (0.34)  $ (0.40)  $ (0.41)  $ (0.41)  $ (0.53)
   Net realized gain                                                  --           --     (0.05)       --        --     (0.11)
------------------------------------------------------------------------------------------------------------------------------
Total distributions                                              $ (0.19)     $ (0.34)  $ (0.45)  $ (0.41)  $ (0.41)  $ (0.64)
------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                       $ (0.08)     $ (0.06)  $  0.08   $  0.22   $  0.81   $ (0.47)
------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                   $  9.68      $  9.76   $  9.82   $  9.74   $  9.52   $  8.71
==============================================================================================================================
Total return*                                                       1.17%        2.80%     5.58%     6.67%    14.18%     2.35%
Ratio of net expenses to average net assets                         1.25%**      1.25%     1.25%     1.24%     1.25%     1.25%
Ratio of net investment income to average net assets                3.33%**      3.36%     3.94%     4.25%     4.50%     5.53%
Portfolio turnover rate                                               15%**        28%       21%       36%       41%       34%
Net assets, end of period (in thousands)                         $36,042      $31,169   $23,892   $20,508   $18,186   $15,404
Ratios with no waiver of fees and assumption of expenses by the
   Adviser and no reduction for fees paid indirectly:
   Total expenses                                                   1.42%**      1.35%     1.35%     1.24%     1.26%     1.30%
   Net investment income                                            3.16%**      3.26%     3.84%     4.25%     4.49%     5.48%
==============================================================================================================================


*   Assumes initial investment at net asset value at the beginning of each
    period, reinvestment of all distributions, and the complete redemption of
    the investment at net asset value at the end of each period.

**  Annualized.

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

78 Pioneer Bond Fund | Semiannual Report | 12/31/13




-----------------------------------------------------------------------------------------------------------------------------------
                                                                 Six Months
                                                                 Ended        Year       Year       Year       Year       Year
                                                                 12/31/13     Ended      Ended      Ended      Ended      Ended
                                                                 (unaudited)  6/30/13    6/30/12    6/30/11    6/30/10    6/30/09
-----------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
Class Y
Net asset value, beginning of period                             $   9.58     $   9.65   $   9.57   $   9.36   $   8.55   $   9.02
-----------------------------------------------------------------------------------------------------------------------------------
Increase from investment operations:
   Net investment income                                         $   0.19     $   0.39   $   0.44   $   0.47   $   0.47   $   0.53
   Net realized and unrealized gain (loss) on investments           (0.04)       (0.07)      0.14       0.20       0.79      (0.31)
-----------------------------------------------------------------------------------------------------------------------------------
Net increase from investment operations                          $   0.15     $   0.32   $   0.58   $   0.67   $   1.26   $   0.22
-----------------------------------------------------------------------------------------------------------------------------------
Distributions to shareowners:
   Net investment income                                         $  (0.22)    $  (0.39)  $  (0.45)  $  (0.46)  $  (0.45)  $  (0.58)
   Net realized gain                                                   --           --      (0.05)        --         --      (0.11)
-----------------------------------------------------------------------------------------------------------------------------------
Total distributions                                              $  (0.22)    $  (0.39)  $  (0.50)  $  (0.46)  $  (0.45)  $  (0.69)
-----------------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                       $  (0.07)    $  (0.07)  $   0.08   $   0.21   $   0.81   $  (0.47)
-----------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                   $   9.51     $   9.58   $   9.65   $   9.57   $   9.36   $   8.55
===================================================================================================================================
Total return*                                                        1.56%        3.34%      6.27%      7.25%     15.06%      2.95%
Ratio of net expenses to average net assets                          0.66%**      0.66%      0.65%      0.61%      0.61%      0.63%
Ratio of net investment income to average net assets                 3.93%**      3.97%      4.55%      4.88%      5.13%      6.10%
Portfolio turnover rate                                                15%**        28%        21%        36%        41%        34%
Net assets, end of period (in thousands)                         $779,899     $916,182   $847,072   $717,433   $713,869   $589,661
Ratios with no waiver of fees and assumption of expenses by the
   Adviser and no reduction for fees paid indirectly:
   Total expenses                                                    0.66%**      0.66%      0.65%      0.61%      0.61%      0.64%
   Net investment income                                             3.93%**      3.97%      4.55%      4.88%      5.13%      6.09%
===================================================================================================================================


*   Assumes initial investment at net asset value at the beginning of each
    period, reinvestment of all distributions, and the complete redemption of
    the investment at net asset value at the end of each period.

**  Annualized.

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


                             Pioneer Bond Fund | Semiannual Report | 12/31/13 79


Financial Highlights (continued)



-----------------------------------------------------------------------------------------------------------------------------
                                                               Six Months
                                                               Ended         Year      Year      Year      Year      Year
                                                               12/31/13      Ended     Ended     Ended     Ended     Ended
                                                               (unaudited)   6/30/13   6/30/12   6/30/11   6/30/10   6/30/09
-----------------------------------------------------------------------------------------------------------------------------
                                                                                                   
Class Z
Net asset value, beginning of period                           $  9.70       $  9.76   $  9.68   $  9.46   $  8.67   $  9.10
-----------------------------------------------------------------------------------------------------------------------------
Increase from investment operations:
   Net investment income                                       $  0.20       $  0.40   $  0.45   $  0.47   $  0.48   $  0.54
   Net realized and unrealized gain (loss) on investments        (0.06)        (0.06)     0.14      0.21      0.77     (0.28)
-----------------------------------------------------------------------------------------------------------------------------
Net increase from investment operations                        $  0.14       $  0.34   $  0.59   $  0.68   $  1.25   $  0.26
-----------------------------------------------------------------------------------------------------------------------------
Distributions to shareowners:
   Net investment income                                       $ (0.22)      $ (0.40)  $ (0.46)  $ (0.46)  $ (0.46)  $ (0.58)
   Net realized gain                                                --            --     (0.05)       --        --     (0.11)
-----------------------------------------------------------------------------------------------------------------------------
Total distributions                                            $ (0.22)      $ (0.40)  $ (0.51)  $ (0.46)  $ (0.46)  $ (0.69)
-----------------------------------------------------------------------------------------------------------------------------
Net increase (decrease) in net asset value                     $ (0.08)      $ (0.06)  $  0.08   $  0.22   $  0.79   $ (0.43)
-----------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                                 $  9.62       $  9.70   $  9.76   $  9.68   $  9.46   $  8.67
=============================================================================================================================
Total return*                                                     1.47%         3.41%     6.23%     7.30%    14.68%     3.42%
Ratio of net expenses to average net assets                       0.65%**       0.65%     0.65%     0.65%     0.63%     0.65%
Ratio of net investment income to average net assets              3.89%**       3.95%     4.50%     4.82%     5.00%     5.91%
Portfolio turnover rate                                             15%**         28%       21%       36%       41%       34%
Net assets, end of period (in thousands)                       $ 3,624       $ 5,889   $ 2,196   $   787   $   720   $   382
Ratios with no waiver of fees and assumption of expenses by
   the Adviser and no reduction for fees paid indirectly:
   Total expenses                                                 0.81%**       0.87%     0.83%     0.72%     0.63%     0.67%
   Net investment income                                          3.73%**       3.73%     4.32%     4.75%     5.00%     5.89%
=============================================================================================================================


*   Assumes initial investment at net asset value at the beginning of each
    period, reinvestment of all distributions, and the complete redemption of
    the investment at net asset value at the end of each period.

**  Annualized.

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

80 Pioneer Bond Fund | Semiannual Report | 12/31/13


Notes to Financial Statements | 12/31/13 (unaudited)

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 seven classes of shares designated as Class A, Class B, Class C,
Class K, Class R, Class Y and Class Z shares. Class K shares were first publicly
offered on December 20, 2012. Effective as of the close of business on December
31, 2009, Class B shares are no longer offered to new or existing shareholders,
except that dividends and/or capital gain distributions may continue to be
reinvested in Class B shares, and shareholders may exchange their Class B shares
for Class B shares of other Pioneer funds, as permitted by existing exchange
privileges. 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. Class B shares convert
to Class A shares approximately eight years after the date of purchase.

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.

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 81


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:

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. 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. Fixed income securities with
    remaining maturity of more than sixty days 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. 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. Short-term fixed income securities with remaining maturities
    of sixty days or less generally are valued at amortized cost. Shares of
    money market mutual funds are valued at such funds' net asset value.

    Securities or senior loans 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 Trust's investment adviser, pursuant to
    procedures adopted by the Trust'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.

82 Pioneer Bond Fund | Semiannual Report | 12/31/13


    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 December 31, 2013, one security was valued using fair value methods (in
    addition to securities valued using prices supplied by independent pricing
    services) representing 0.1% of net assets. 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.

    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 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.

B.  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 December 31, 2013, the Fund did not accrue any interest or penalties
    with respect to uncertain tax positions, which, if applicable, would be
    recorded as an income tax expense in the Statement of Operations. Tax
    returns filed within the prior three years remain subject to examination by
    Federal and State tax authorities.

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 83


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

     The tax character of current year distributions payable will be determined
     at the end of the current taxable year. The tax character of distributions
     paid during the years ended June 30, 2013 and June 30, 2012 was as follows:



     ---------------------------------------------------------------------------
                                                          2013              2012
     ---------------------------------------------------------------------------
                                                               
     Distributions paid from:
     Ordinary income                               $61,258,189       $61,062,120
     Long-term capital gain                                 --         6,835,526
     ---------------------------------------------------------------------------
          Total                                    $61,258,189       $67,897,646
     ===========================================================================


     The following shows the components of distributable earnings on a federal
     income tax basis at June 30, 2013:



     ---------------------------------------------------------------------------
                                                                           2013
     ---------------------------------------------------------------------------
                                                                
     Distributable earnings:
     Undistributed ordinary income                                 $  2,242,622
     Capital loss carryforward                                      (18,403,543)
     Dividends payable                                               (1,067,036)
     Net unrealized appreciation                                     53,406,721
     ---------------------------------------------------------------------------
          Total                                                    $ 36,178,764
     ===========================================================================


    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.

C.  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 $23,839 in underwriting commissions on the sale of Class A shares
    during the six months ended December 31, 2013.

84 Pioneer Bond Fund | Semiannual Report | 12/31/13


D.  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 B, 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 B, Class C, Class K, Class R,
    Class Y and Class Z shares can reflect different transfer agent and
    distribution expense rates.

E.  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.

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 85


F.  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
    December 31, 2013 was $279,447 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 contracts may not directly
    correlate to the changes in value of the underlying securities. The average
    value of contracts open during the six months ended December 31, 2013 was
    $127,919,386.

    At December 31, 2013, open futures contracts were as follows:



---------------------------------------------------------------------------------------
                           Number of                                     Unrealized
                           Contracts      Settlement                     Appreciation/
Type                       Long/(Short)   Month        Value             (Depreciation)
---------------------------------------------------------------------------------------
                                                             
U.S. Long Bond (CBT)       127            3/14         $ 16,295,688      $(271,847)
U.S. Ultra Bond (CBT)      65             3/14            8,856,250       (133,554)
U.S. 10 Year Note (CBT)    (193)          3/14          (23,748,048)       434,275
U.S. 2 Year Note (CBT)     (202)          3/14          (44,402,125)        78,905
U.S. 5 Year Note (CBT)     (456)          3/14          (54,406,500)       691,128
---------------------------------------------------------------------------------------
                                                       $(97,404,735)     $ 798,907
---------------------------------------------------------------------------------------


G.  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.

86 Pioneer Bond Fund | Semiannual Report | 12/31/13


H.  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. 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, either the buyer
    or seller of protection will make a rebalancing payment to the other party.
    The amount of the rebalancing payment is determined based on the value of
    the contract on the trade date. Periodic payments received or paid by the
    Fund are recorded as realized gains or losses.

    The 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. 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.

    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. In addition,
    obligations under sell protection credit default swaps may be partially
    offset by net amounts received from settlement of buy protection credit
    default swaps entered into by the Fund for the same reference obligation
    with the same counterparty.

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 87


    During the six months ended December 31, 2013, the Fund entered into one
    credit default swap contract, with a notional amount of $14,000,000. The
    Fund had no outstanding credit default swap contracts as of December 31,
    2013.

    The average value of swap contracts open during the six months ended
    December 31, 2013 was $14,176,840.

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 0.50% of
the Fund's average daily net assets up to $1 billion; 0.45% of the next $1
billion; and 0.40% of the excess over $2 billion. For the six months ended
December 31, 2013, the effective management fee (excluding waivers and/or
assumption of expenses) was equal to 0.48% of the Fund's average daily net
assets.

PIM has contractually agreed to limit ordinary operating expenses to the extent
required to reduce Fund expenses to 0.85%, 1.90%, 1.90%, 1.25% and 0.65% of the
average daily net assets attributable to Class A, Class B, Class C, Class R and
Class Z shares, respectively. Fees waived and expenses reimbursed during the six
months ended December 31, 2013 are reflected on the Statement of Operations.
These expense limitations are in effect through November 1, 2015. 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
$98,052 in management fees, administrative costs and certain other
reimbursements payable to PIM at December 31, 2013.

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 six months ended December 31, 2013, such out-of-pocket expenses by class of
shares were as follows:

88 Pioneer Bond Fund | Semiannual Report | 12/31/13




--------------------------------------------------------------------------------
Shareholder Communications:
--------------------------------------------------------------------------------
                                                                     
Class A                                                                 $408,661
Class B                                                                    5,756
Class C                                                                   45,251
Class R                                                                   57,815
Class Y                                                                  399,056
Class Z                                                                    2,611
--------------------------------------------------------------------------------
   Total                                                                $919,150
================================================================================


Included in "Due to affiliates" reflected on the Statement of Assets and
Liabilities is $257,733 in transfer agent fees and out-of-pocket reimbursements
payable to PIMSS at December 31, 2013.

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 B, Class C and
Class R shares. Pursuant to the Plan, the Fund pays PFD 0.25% of the average
daily net assets attributable to Class A shares as compensation for personal
services and/or account maintenance services or distribution services with
regard to Class A shares. Pursuant to the Plan, the Fund also pays PFD 1.00% of
the average daily net assets attributable to Class B and Class C shares. The fee
for Class B and 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 B and 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 $25,473 in distribution fees payable to PFD at December 31, 2013.

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. Class B shares that
are redeemed within five years of purchase are subject to a CDSC at declining
rates beginning at 4.00%, based on the lower of cost or market value of shares
being redeemed. Redemptions of Class C shares within 12 months of purchase are
subject to a CDSC of 1.00%, based on the lower of

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 89


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 six months ended December 31, 2013,
CDSC in the amount of $10,328 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 six months ended December 31, 2013, 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 as of fiscal year end is in the amount of $215
million. Under such facility, depending on the type of loan, interest on
borrowings is payable at the London Interbank Offered Rate (LIBOR) plus 0.90% on
an annualized basis, or the Alternate Base Rate, which is the greater of (a) the
facility's administrative agent's daily announced prime rate on the borrowing
date, (b) 2% plus the Federal Funds Rate on the borrowing date and (c) 2% plus
the overnight Euro dollar rate on the borrowing date. The Funds pay an annual
commitment fee to participate in the credit facility. The commitment fee is
allocated among participating Funds based on an allocation schedule set forth in
the credit agreement. For the six months ended December 31, 2013, the Fund had
no borrowings under the credit facility.

90 Pioneer Bond Fund | Semiannual Report | 12/31/13


7. Additional Disclosures about Derivative Instruments and Hedging Activities:

Values of derivative instruments as of December 31, 2013 were as follows:



------------------------------------------------------------------------------------------
Derivatives Not
Accounted for as
Hedging Instruments         Asset Derivatives 2013            Liabilities Derivatives 2013
Under Accounting            ----------------------------      ----------------------------
Standards Codification      Balance Sheet                     Balance Sheet
(ASC) 815                   Location            Value         Location             Value
------------------------------------------------------------------------------------------
                                                                       
Interest Rate Futures*      Net unrealized                    Net unrealized
                            appreciation on                   depreciation on
                            futures contracts   $798,907      futures contracts    $    --
------------------------------------------------------------------------------------------
Total                                           $798,907                           $    --
==========================================================================================


* Reflects the unrealized appreciation on futures contracts (see Note 1F).

The effect of derivative instruments on the Statement of Operations for the six
months ended December 31, 2013 was as follows:



----------------------------------------------------------------------------------------------
                                                                             Change in
Derivatives Not                                               Realized       Unrealized
Accounted for as                                              Gain or        Appreciation
Hedging Instruments                                           Loss on        or (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
----------------------------------------------------------------------------------------------
                                                                    
Interest Rate Futures    Net realized gain (loss) on
                         futures contracts                    $ 37,482
Interest Rate Futures    Change in unrealized appreciation
                         (depreciation) on
                         futures contracts                                   $ 442,783
Credit Default Swaps     Net realized gain (loss) on
                         credit default swaps                 $229,371
Credit Default Swaps     Change in unrealized appreciation
                         (depreciation) on credit
                         default swaps                                       $(195,506)


                             Pioneer Bond Fund | Semiannual Report | 12/31/13 91


Approval of Investment Advisory Agreement

Pioneer Investment Management, Inc. (PIM) serves as the investment adviser to
Pioneer Bond Fund (the Fund) pursuant to an investment advisory agreement
between PIM and the Fund. In order for PIM to remain the investment adviser of
the Fund, the Trustees of the Fund must determine annually whether to renew the
investment advisory agreement for the Fund.

The contract review process began in March 2013 as the Trustees of the Fund
agreed on, among other things, an overall approach and timeline for the process.
In July 2013, the Trustees approved the format of the contract review materials
and submitted their formal request to PIM to furnish information necessary to
evaluate the terms of the investment advisory agreement. The contract review
materials were provided to the Trustees in July 2013 and September 2013. After
reviewing and discussing the materials, the Trustees submitted a request for
additional information to PIM, and materials were provided in response to this
request. Meetings of the Independent Trustees of the Fund were held in July,
September, and November, 2013 to review and discuss the contract review
materials. In addition, the Trustees took into account the information related
to the Fund provided to the Trustees at regularly scheduled meetings.

At a meeting held on November 12, 2013, based on their evaluation of the
information provided by PIM and third parties, the Trustees of the Fund,
including the Independent Trustees voting separately, unanimously approved the
renewal of the investment advisory agreement for another year. In considering
the renewal of the investment advisory agreement, the Trustees considered
various factors that they determined were relevant, including the factors
described below. In all quintile rankings referred to throughout this
disclosure, first quintile is most favorable to the Fund's shareowners. Thus,
highest relative performance would be first quintile and lowest relative
expenses would also be first quintile. The Trustees did not identify any single
factor as the controlling factor in determining to approve the renewal of the
agreement.

Nature, Extent and Quality of Services

The Trustees considered the nature, extent and quality of the services that had
been provided by PIM to the Fund, taking into account the investment objective
and strategy of the Fund. The Trustees reviewed the terms of the investment
advisory agreement. The Trustees also reviewed PIM's investment approach for the
Fund and its research process. The Trustees considered the resources of PIM and
the personnel of PIM who provide investment management services to the Fund.
They also reviewed the amount of non-Fund

92 Pioneer Bond Fund | Semiannual Report | 12/31/13


assets managed by the portfolio managers of the Fund. The Trustees considered
the non-investment resources and personnel of PIM involved in PIM's services
to the Fund, including PIM's compliance and legal resources and personnel. The
Trustees noted the substantial attention and high priority given by PIM's senior
management to the Pioneer fund complex.

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

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

Performance of the Fund

The Trustees review the Fund's performance on a regular basis, based on analysis
and data prepared by PIM for this purpose and discuss performance issues with
PIM on an ongoing basis. For purposes of their contract renewal deliberations,
the Trustees considered the performance results of the Fund over various time
periods. They reviewed information comparing the Fund's performance with the
performance of its peer group of funds as classified by Morningstar, Inc.
(Morningstar), an independent provider of investment company data, and with the
performance of the Fund's benchmark index. The Trustees considered that the
Fund's annualized total return was in the first quintile of its Morningstar
category for the one, three and ten year periods ended June 30, 2013 and in the
second quintile of its Morningstar category for the five year period ended June
30, 2013. The Trustees also considered that the Fund's yield (for the twelve
months ended June 30, 2013) exceeded the yield of the Fund's benchmark index for
the same period. The Trustees noted the discussions held throughout the year
regarding the Fund's performance and confirmed that those discussions were
factored into the Trustees' deliberations concerning the renewal of the advisory
agreement. The Trustees concluded that the investment performance of the Fund
was satisfactory.

Management Fee and Expenses

The Trustees considered information showing the fees and expenses of the Fund in
comparison to the management fees and expense ratios of its peer group of funds
as classified by Morningstar and also to the expense ratios of a peer group of
funds selected on the basis of criteria determined by the

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 93


Independent Trustees for this purpose using data provided by Strategic Insight
Mutual Fund Research and Consulting, LLC (Strategic Insight), an independent
third party.

The Trustees considered that the Fund's management fee for the twelve months
ended June 30, 2013 was in the third quintile relative to the management fees
paid by other funds in its Morningstar peer group for the comparable period. The
Trustees also considered the breakpoints in the management fee schedule and the
reduced fee rates above certain asset levels.

The Trustees considered that the expense ratio of the Fund's Class A shares for
the twelve months ended June 30, 2013 was in the third quintile relative to its
Morningstar peer group and in the first quintile relative to its Strategic
Insight peer group, in each case for the comparable period, and that the expense
ratio of the Fund's Class Y shares for the twelve months ended June 30, 2013 was
in the fourth quintile relative to its Morningstar peer group and in the third
quintile relative to its Strategic Insight peer group, in each case for the
comparable period. The Trustees noted that the expense ratio of the Fund's Class
Y shares was approximately six basis points higher than the median expense ratio
of the Fund's Morningstar peer group, and approximately the same as the median
expense ratio of the Fund's Strategic Insight peer group. The Trustees noted
that PIM was waiving fees and/or reimbursing expenses in order to limit the
ordinary operating expenses of the Fund. The Trustees considered the impact of
transfer agency, sub-transfer agency, and other non-management fee expenses on
the expense ratios of the Fund, and noted the impact of expenses relating to
small accounts and omnibus accounts on transfer and sub-transfer agency expenses
generally. The Trustees noted that they separately review the Fund's transfer
agency, sub-transfer agency and intermediary arrangements.

The Trustees reviewed management fees charged by PIM and PIM's affiliate,
Pioneer Institutional Asset Management, Inc. (together with PIM, "Pioneer") to
institutional and other clients, including publicly offered European funds
sponsored by affiliates of Pioneer, unaffiliated U.S. registered investment
companies (in a sub-advisory capacity), and unaffiliated foreign and domestic
separate accounts. The Trustees also considered PIM's costs in providing
services to the Fund and Pioneer's costs in providing services to the other
clients and considered the differences in management fees and profit margins for
Fund and non-Fund services. In evaluating the fees associated with Pioneer's
client accounts, the Trustees took into account the respective demands,
resources and complexity associated with the Fund and client accounts. The
Trustees noted that, in some instances, the fee rates for those clients were
lower than the management fee for the Fund and considered that, under the
investment advisory agreement with the Fund, PIM performs

94 Pioneer Bond Fund | Semiannual Report | 12/31/13


additional services for the Fund that it does not provide to those other clients
or services that are broader in scope, including oversight of the Fund's other
service providers and activities related to compliance and the extensive
regulatory and tax regimes to which the Fund is subject. The Trustees also
considered the different entrepreneurial risks associated with PIM's
management of the Fund and Pioneer's management of the other client
accounts. The Trustees concluded that the management fee payable by the
Fund to PIM was reasonable in relation to the nature and quality of the services
provided by PIM.

Profitability

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

Economies of Scale

The Trustees considered PIM's views relating to economies of scale in connection
with the Pioneer Funds as fund assets grow and the extent to which any such
economies of scale are shared with funds and fund shareholders. The Trustees
noted the breakpoints in the management fee schedule. The Trustees recognize
that economies of scale are difficult to identify and quantify, rarely
identifiable on a fund-by-fund basis, and that, among other factors that may be
relevant, are the following: fee levels, expense subsidization, investment by
PIM in research and analytical capabilities and PIM's commitment and resource
allocation to the Fund. The Trustees noted that profitability also may be an
indicator of the availability of any economies of scale, although profitability
may vary for other reasons particularly, for example during the recent difficult
periods for financial markets, as the level of services was maintained
notwithstanding a significant decline in PIM's fee revenues from the Fund.
Accordingly, the Trustees concluded that economies of scale, if any, were being
appropriately shared with the Fund.

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 95


Other Benefits

The Trustees considered the other benefits to PIM from its relationship with the
Fund. The Trustees considered the character and amount of fees paid by the Fund,
other than under the investment advisory agreement, for services provided by PIM
and its affiliates. The Trustees further considered the revenues and
profitability of PIM's businesses other than the fund business. The Trustees
considered the intangible benefits to PIM by virtue of its relationship with the
Fund and the other Pioneer funds. The Trustees concluded that the receipt of
these benefits was reasonable in the context of the overall relationship between
PIM and the Fund.

Conclusion

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

96 Pioneer Bond Fund | Semiannual Report | 12/31/13


Trustees, Officers and Service Providers

Trustees+                               Officers
Thomas J. Perna, Chairman               Daniel K. Kingsbury, President and
David R. Bock                              Chief Executive Officer*
Benjamin M. Friedman                    Mark E. Bradley, Treasurer**
Margaret B.W. Graham                    Christopher J. Kelley, Secretary
Daniel K. Kingsbury                     John F. Cogan, Jr., President***
Marguerite A. Piret
Stephen K. West

Investment Adviser and Administrator
Pioneer Investment Management, Inc.

Custodian and Sub-Administrator
Brown Brothers Harriman & Co.

Principal Underwriter
Pioneer Funds Distributor, Inc.

Legal Counsel
Bingham McCutchen 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 http://www.sec.gov.

*   Mr. Kingsbury became President and Chief Executive Officer of the Fund
    effective January 1, 2014. Mr. Mark D. Goodwin became Executive Vice
    President of the Fund effective January 28, 2014.

**  Chief Financial and Accounting Officer of the Fund.

*** Mr. Cogan resigned as President and Chief Executive Officer of the Fund
    effective January 1, 2014.

+   Effective January 28, 2014, Mr. Marc O. Mayer and Mr. Kenneth J. Taubes
    became Trustees of the Fund.

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 97


                           This page for your notes.

98 Pioneer Bond Fund | Semiannual Report | 12/31/13


                           This page for your notes.

                             Pioneer Bond Fund | Semiannual Report | 12/31/13 99


                            This page for your notes.

100 Pioneer Bond Fund | Semiannual Report | 12/31/13


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 fax                                                 1-800-225-4240

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

Visit our web site: us.pioneerinvestments.com

This report must be preceded or accompanied by a prospectus.

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


[LOGO] PIONEER
       Investments(R)

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

us.pioneerinvestments.com

Securities offered through Pioneer Funds Distributor, Inc.
60 State Street, Boston, MA 02109
Underwriter of Pioneer Mutual Funds, Member SIPC
(C) 2014 Pioneer Investments 18633-08-0214



ITEM 2. CODE OF ETHICS.

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

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

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

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

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

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

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

        (5) Accountability for adherence to the code.

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

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

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

Not applicable.

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

Not applicable.

(f) The registrant must:

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

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

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

ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT.

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

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

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

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

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

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

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

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

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

Not applicable.


ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES.

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

N\A

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

N\A


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

N\A

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

N\A

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

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

                  SECTION I - POLICY PURPOSE AND APPLICABILITY

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

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

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

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

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



                               SECTION II - POLICY

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

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

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

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




                     SECTION III - POLICY DETAIL, CONTINUED

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

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

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

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




                     SECTION III - POLICY DETAIL, CONTINUED

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

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

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




                     SECTION III - POLICY DETAIL, CONTINUED

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

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

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

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

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

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


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

Non-Audit Services
N\A


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

N/A

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

N\A

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

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

ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS

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

N/A

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

N/A

ITEM 6. SCHEDULE OF INVESTMENTS.

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

Included in Item 1


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

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

Not applicable to open-end management investment companies.



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

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


Not applicable to open-end management investment companies.


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

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

Not applicable to open-end management investment companies.


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

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


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


ITEM 11. CONTROLS AND PROCEDURES.

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

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


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

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

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

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


ITEM 12. EXHIBITS.

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

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



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

Filed herewith.





                                   SIGNATURES

                          [See General Instruction F]


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


(Registrant) Pioneer Bond Fund


By (Signature and Title)* /s/ Daniel K. Kingsbury
Daniel K. Kingsbury, President

Date February 27, 2014


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/ Daniel K. Kingsbury
Daniel K. Kingsbury, President

Date February 27, 2014


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

Date February 27, 2014

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