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overview/highlights.xsl

    overview/strategy.xsl

    Fund Strategy

    The Fund seeks high current income by actively managing a diversified portfolio of U.S. and international high yield and investment-grade debt securities. It selects sector concentrations driven by evaluation of capital markets. The Fund actively adjusts a blend of fixed-income securities to manage risk, seek enhanced yield, and offer total return potential.
    Diversification does not assure a profit or protect against loss.

    overview/mngmt.xsl

    Portfolio Management

      • Kenneth J. Taubes, Portfolio Manager
      • Mr. Taubes, an executive vice president and Chief Investment Officer of U.S. Investment Management, joined Amundi Pioneer in 1998 and has been an investment professional since 1983.
      • Andrew Feltus, CFA, Portfolio Manager
      • Mr. Feltus, a senior vice president and Director of High Yield and Bank Loans, joined Amundi Pioneer in 1994 and has been an investment professional since 1991.
      • Charles Melchreit, Portfolio Manager
      • Mr. Melchreit, a senior vice president and Director of Investment Grade, joined Amundi Pioneer in 2006 and has been an investment professional since 1986.

    Portfolio Management Perspective

    "In-depth, bottom-up research, timely asset allocation, and well-diversified bond asset classes are the foundation of our portfolio construction and security selection process. We believe this approach allows higher yields and higher returns than a core bond strategy alone allows without increased risk."

    overview/footnotes.xsl

    A WORD ABOUT RISK

    Investments in high yield or lower-rated securities are subject to greater-than-average price volatility, illiquidity and possibility of default. When interest rates rise, the prices of fixed-income securities in the Fund will generally fall. Conversely, when interest rates fall, the prices of fixed-income securities in the Fund will generally rise. Investments in the fund are subject to possible loss due to the financial failure of issuers of 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. The securities issued by U.S. Government sponsored entities (i.e., FNMA, 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. Investing in foreign and/or emerging market securities involves risks relating to interest rates, currency exchange rates, economic, and political conditions. At times, the Fund's investments may represent industries or industry sectors that are interrelated or have common risks, making it more susceptible to any economic, political, or regulatory developments or other risks affecting those industries and sectors. These risks may increase share price volatility.
    overview/bankbox.xsl
    • Not FDIC insured
    • May lose value
    • No bank guarantee
    Before investing, consider the product's investment objectives, risks, charges and expenses. Contact your advisor or Amundi Pioneer for a prospectus or summary prospectus containing this information. Read it carefully. To obtain a free prospectus and for information on any Pioneer fund, please download from our web site.
    Neither Amundi Pioneer, nor its representatives, are legal or tax advisors. In addition, Amundi Pioneer does not provide advice or recommendations. The investments you choose should correspond to your needs, goals, and risk tolerance. For assistance in determining your financial situation, please consult an investment professional.
    overview/mstarfootnotes.xsl

    About Morningstar Ratings:

    Ratings are based on past performance, which is no guarantee of future results. The Overall Morningstar RatingTM is based on a weighted average of the star ratings assigned to a fund's three, five, and ten year (as applicable) time periods. The Morningstar Category identifies funds based on their underlying portfolio holdings. Classifications are based on portfolio statistics and compositions over the past three years. For funds less than three years old, category classifications are based on life of the fund. Pioneer Strategic Income Fund was rated exclusively against U.S.-domiciled multisector bond funds as follows: 3, 3 and 4 stars among 243, 192 and 109 funds for the three-, five-, and 10-year periods ended 8/31/17, respectively. The Morningstar Rating is for Class A Shares only. Ratings may vary among share classes.
    Ratings are based on past performance, which is no guarantee of future results. Star ratings do not reflect the effect of any applicable sales load. The Morningstar RatingTM for funds, or "star rating", is calculated for managed products (including mutual funds, variable annuity and variable life subaccounts, exchange-traded funds, closed-end funds and separate accounts) with at least a three-year history. Exchange-traded funds and open-ended mutual funds are considered a single population for comparative purposes. It is calculated based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a managed product's monthly excess performance, placing more emphasis on downward variations and rewarding consistent performance. The top 10% of products in each product category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars, and the bottom 10% receive 1 star. The Overall Morningstar Rating for a managed product is derived from a weighted average of the performance figures associated with its three-, five-, and 10-year (if applicable) Morningstar Rating metrics. The weights are: 100% three-year rating for 36-59 months of total returns, 60% five-year rating/40% three-year rating for 60-119 months of total returns, and 50% 10-year rating/30% five-year rating/20% three-year rating for 120 or more months of total returns. While the 10-year overall star rating formula seems to give the most weight to the 10-year period, the most recent three-year period actually has the greatest impact because it is included in all three rating periods. The following copyright pertains only to Morningstar information. The Morningstar information contained herein 1) is proprietary to Morningstar; 2) may not be copied; and 3) is not warranted to be accurate, complete or timely. Neither Morningstar nor its content providers are responsible for any damages or losses arising from any use of this information. ©2017 Morningstar, Inc. All Rights Reserved.
    perf/risk.xsl

    Risk Measures (3-Year)

    As of August 31, 2017

    As compared to the BBG Barc U.S. Universal Index

    R-squared0.39
    Beta0.65
    Sharpe Ratio0.29
    Standard Deviation (Fund)2.84
    Standard Deviation (Benchmark)2.72
    Risk measures apply to Class A Shares only.
    Beta is a measure of the volatility of a fund relative to the overall market.
    R-squared represents the percentage of the portfolio's movements that can be explained by the general movements of the market.
    Standard Deviation is a statistical measure of the historic volatility of a portfolio.
    Sharpe Ratio - a measure of excess return per unit of risk, as defined by standard deviation. A higher Sharpe ratio suggests better risk-adjusted performance.

    Source: Lipper.
    perf/performance.xsl

    Fund Performance

    10K chart

     

    Chart is for illustrative purposes. These results represent the percentage change in net asset value per share. Returns would have been lower had sales charges been reflected.

     
    For the most recent month-end performance results click here. 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. 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.

    Average Annual Total Returns

    through August 31, 2017
     
    1-Year
    3-Year
    5-Year
    10-Year
    Since Inception
    Class A Shares (NAV)
    4.21%
    3.17%
    3.93%
    6.07%
    6.69%
    Class A Shares (POP)
    -0.50%
    1.61%
    2.98%
    5.58%
    6.42%
    Class C Return If Held
    3.44%
    2.47%
    3.22%
    5.34%
    5.93%
    Class C Return If Redeemed
    3.44%
    2.47%
    3.22%
    5.34%
    5.93%
    Class K Shares (NAV)
    4.57%
    3.62%
    4.34%
    6.28%
    6.80%
    Class R Return If Held
    3.78%
    2.81%
    3.56%
    5.74%
    6.49%
    Class R Return If Redeemed
    3.78%
    2.81%
    3.56%
    5.74%
    6.49%
    Class Y Shares (NAV)
    4.44%
    3.49%
    4.23%
    6.42%
    6.94%
    BBG Barc U.S. Universal Index
    1.34%
    2.96%
    2.66%
    4.69%
    5.25%
    Lipper Multi-Sector Income Funds Average
    5.08%
    2.99%
    3.77%
    5.31%
    5.50%

    Average Annual Total Returns

    through June 30, 2017
     
    1-Year
    3-Year
    5-Year
    10-Year
    Since Inception
    Class A Shares (NAV)
    5.73%
    2.95%
    4.25%
    6.05%
    6.68%
    Class A Shares (POP)
    0.94%
    1.40%
    3.30%
    5.56%
    6.41%
    Class C Return If Held
    5.07%
    2.28%
    3.56%
    5.32%
    5.93%
    Class C Return If Redeemed
    5.07%
    2.28%
    3.56%
    5.32%
    5.93%
    Class K Shares (NAV)
    6.18%
    3.40%
    4.67%
    6.26%
    6.80%
    Class R Return If Held
    5.37%
    2.60%
    3.90%
    5.72%
    6.49%
    Class R Return If Redeemed
    5.37%
    2.60%
    3.90%
    5.72%
    6.49%
    Class Y Shares (NAV)
    6.05%
    3.27%
    4.57%
    6.41%
    6.94%
    BBG Barc U.S. Universal Index
    0.91%
    2.76%
    2.73%
    4.73%
    5.22%
    Lipper Multi-Sector Income Funds Average
    5.90%
    2.67%
    4.06%
    5.18%
    5.48%

    Calendar Year Returns (Total Return)

    through August 31, 2017
     
    YTD
    2016
    2015
    2014
    2013
    Class A Shares at NAV
    4.50%
    7.63%
    -1.46%
    4.61%
    1.50%
    Class C Shares at NAV
    4.00%
    6.90%
    -2.05%
    3.79%
    0.82%
    Class K Shares at NAV
    4.71%
    8.09%
    -1.03%
    5.12%
    1.88%
    Class R Shares at NAV
    4.18%
    7.29%
    -1.78%
    4.21%
    1.13%
    Class Y Shares at NAV
    4.63%
    7.96%
    -1.15%
    4.93%
    1.81%
    BBG Barc U.S. Universal Index
    4.03%
    3.91%
    0.43%
    5.56%
    -1.35%
    Lipper Multi-Sector Income Funds Average
    5.00%
    7.18%
    -1.44%
    3.53%
    1.80%

    Class A Share (POP): Reflects the deduction of maximum 4.50% sales charge.
    Class C Return if Redeemed: The performance of 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 shown above. Class C Shares held for less than one year are subject to a 1% contingent deferred sales charge (CDSC).
    The performance of 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 12b-1 fees applicable to Class A shares. Since fees for Class A shares generally are higher than those of Class K shares, the performance of Class K shares prior to their inception would have been higher than the performance shown. For the period beginning December 20, 2012, the actual performance of Class K shares is reflected. Class K shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors.
    Class R Return if Redeemed: The performance of Class R shares for the period prior to the commencement of operations of Class R shares on 4/1/03 is based on the performance of Class A shares, reduced to reflect the higher distribution and service fees of Class R shares. For the period after April 1, 2003, the actual performance of Class R shares is reflected, which performance may be influenced by the smaller asset size of Class R shares compared to Class A shares. The performance of Class R shares does not reflect the 1% CDSC that was in effect prior to July 1, 2004.
    Performance for periods prior to the inception of Class Y Shares on 9/9/04 reflects the NAV performance of the Fund's Class A Shares. The performance does not reflect differences in expenses, including the 12b-1 fees applicable to Class A Shares. Since fees for Class A Shares are generally higher than those of Class Y, the performance shown for the Class Y Shares prior to their inception would have been higher. Class Y shares are not subject to sales charges and are available for limited groups of investors, including institutional investors.
    NAV results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. The Bloomberg Barclays (BBG Barc) U.S. Universal Index (benchmark) is the union of the U.S. Aggregate Index, the U.S. High Yield Corporate Index, the 144A Index, the Eurodollar Index, the Emerging Markets Index, the non-ERISA portion of the CMBS Index, and the CMBS High Yield Index. Municipal debt, private placements and non-dollar-denominated issues are excluded. The Lipper Multi-Sector Income Funds Average represents the average annual returns for all Multi-Sector Income Funds for the respective time periods. Indices are unmanaged and their returns assume reinvestment of dividends and, unlike fund returns, do not reflect any fees or expenses. You cannot invest directly in an index. Periods less than one year are actual, not annualized.
    perf/bankbox.xsl
    • Not FDIC insured
    • May lose value
    • No bank guarantee
    Before investing, consider the product's investment objectives, risks, charges and expenses. Contact your advisor or Amundi Pioneer for a prospectus or summary prospectus containing this information. Read it carefully. To obtain a free prospectus and for information on any Pioneer fund, please download from our web site.
    Neither Amundi Pioneer, nor its representatives, are legal or tax advisors. In addition, Amundi Pioneer does not provide advice or recommendations. The investments you choose should correspond to your needs, goals, and risk tolerance. For assistance in determining your financial situation, please consult an investment professional.
    perf/mstarfootnotes.xsl

    About Morningstar Ratings:

    Ratings are based on past performance, which is no guarantee of future results. The Overall Morningstar RatingTM is based on a weighted average of the star ratings assigned to a fund's three, five, and ten year (as applicable) time periods. The Morningstar Category identifies funds based on their underlying portfolio holdings. Classifications are based on portfolio statistics and compositions over the past three years. For funds less than three years old, category classifications are based on life of the fund. Pioneer Strategic Income Fund was rated exclusively against U.S.-domiciled multisector bond funds as follows: 3, 3 and 4 stars among 243, 192 and 109 funds for the three-, five-, and 10-year periods ended 8/31/17, respectively. The Morningstar Rating is for Class A Shares only. Ratings may vary among share classes.
    Ratings are based on past performance, which is no guarantee of future results. Star ratings do not reflect the effect of any applicable sales load. The Morningstar RatingTM for funds, or "star rating", is calculated for managed products (including mutual funds, variable annuity and variable life subaccounts, exchange-traded funds, closed-end funds and separate accounts) with at least a three-year history. Exchange-traded funds and open-ended mutual funds are considered a single population for comparative purposes. It is calculated based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a managed product's monthly excess performance, placing more emphasis on downward variations and rewarding consistent performance. The top 10% of products in each product category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars, and the bottom 10% receive 1 star. The Overall Morningstar Rating for a managed product is derived from a weighted average of the performance figures associated with its three-, five-, and 10-year (if applicable) Morningstar Rating metrics. The weights are: 100% three-year rating for 36-59 months of total returns, 60% five-year rating/40% three-year rating for 60-119 months of total returns, and 50% 10-year rating/30% five-year rating/20% three-year rating for 120 or more months of total returns. While the 10-year overall star rating formula seems to give the most weight to the 10-year period, the most recent three-year period actually has the greatest impact because it is included in all three rating periods. The following copyright pertains only to Morningstar information. The Morningstar information contained herein 1) is proprietary to Morningstar; 2) may not be copied; and 3) is not warranted to be accurate, complete or timely. Neither Morningstar nor its content providers are responsible for any damages or losses arising from any use of this information. ©2017 Morningstar, Inc. All Rights Reserved.
    holdings/portfolio.xsl

    Portfolio Allocation

    (% of Portfolio) as of August 31, 2017
    Agency Pass Throughs23.3%
    US Invest. Grade Corp.14.6%
    Emerging Markets9.8%
    Non-Agency MBS9.5%
    Int'l Invest.-Grade Bonds7.4%
    Bank Loans7.3%
    US High Yield Corp.6.5%
    U.S. Treasury/Agency Securities3.9%
    Asset Backed Securities3.8%
    CMBS3.5%
    Cash & Equivalents3.1%
    Other7.3%
    holdings/topholdings.xsl

    Top Holdings

    (% of Portfolio) as of August 31, 2017
    1U.S. Treasury Inflation Indexed Bonds, 0.75%, 2/15/451.9%
    2U.S. Treasury Inflation Indexed Bonds, 1.0%, 2/15/461.1%
    3Wells Fargo & Co., 7.5%, 12/31/49 (Perpetual)0.7%
    4International Bank for Reconstruction & Development, 3.5%, 1/22/210.7%
    5New Zealand Government Bond, 5.5%, 4/15/230.6%
    6International Finance Corp., 6.3%, 11/25/240.5%
    7Bank of America Corp., 7.25%, 12/31/49 (Perpetual)0.5%
    8Fannie Mae, 5.0%, 11/1/440.5%
    9Electricite de France SA, 6.0%, 1/22/14 (144A)0.4%
    10FN 30 YR POOL 3.5% #BH7772 01Aug470.4%
    TOTAL7.3%
    *The portfolio is actively managed and current fund information is subject to change. The holdings listed should not be considered recommendations to buy or sell any security listed.

    Click here for a full list of holdings.

    holdings/sectors.xsl

    holdings/qualitydist.xsl

    Quality Distribution

    (% of Portfolio) as of August 31, 2017
    AAA36.4%
    AA5.2%
    A5.4%
    BBB22.6%
    BB11.4%
    B9.0%
    CCC1.6%
    Not Rated5.6%
    Cash Equivalent2.9%
    Due to rounding, figures may not total 100%.
    Credit rating breakdown reflects the average of available ratings across Moody's, Standard & Poor's (S&P) and Fitch. Bond ratings are ordered highest to lowest in portfolio. Based on S&P’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.
    holdings/country.xslholdings/bankbox.xsl
    • Not FDIC insured
    • May lose value
    • No bank guarantee
    Before investing, consider the product's investment objectives, risks, charges and expenses. Contact your advisor or Amundi Pioneer for a prospectus or summary prospectus containing this information. Read it carefully. To obtain a free prospectus and for information on any Pioneer fund, please download from our web site.
    Neither Amundi Pioneer, nor its representatives, are legal or tax advisors. In addition, Amundi Pioneer does not provide advice or recommendations. The investments you choose should correspond to your needs, goals, and risk tolerance. For assistance in determining your financial situation, please consult an investment professional.
    holdings/mstarfootnotes.xsl

    About Morningstar Ratings:

    Ratings are based on past performance, which is no guarantee of future results. The Overall Morningstar RatingTM is based on a weighted average of the star ratings assigned to a fund's three, five, and ten year (as applicable) time periods. The Morningstar Category identifies funds based on their underlying portfolio holdings. Classifications are based on portfolio statistics and compositions over the past three years. For funds less than three years old, category classifications are based on life of the fund. Pioneer Strategic Income Fund was rated exclusively against U.S.-domiciled multisector bond funds as follows: 3, 3 and 4 stars among 243, 192 and 109 funds for the three-, five-, and 10-year periods ended 8/31/17, respectively. The Morningstar Rating is for Class A Shares only. Ratings may vary among share classes.
    Ratings are based on past performance, which is no guarantee of future results. Star ratings do not reflect the effect of any applicable sales load. The Morningstar RatingTM for funds, or "star rating", is calculated for managed products (including mutual funds, variable annuity and variable life subaccounts, exchange-traded funds, closed-end funds and separate accounts) with at least a three-year history. Exchange-traded funds and open-ended mutual funds are considered a single population for comparative purposes. It is calculated based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a managed product's monthly excess performance, placing more emphasis on downward variations and rewarding consistent performance. The top 10% of products in each product category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars, and the bottom 10% receive 1 star. The Overall Morningstar Rating for a managed product is derived from a weighted average of the performance figures associated with its three-, five-, and 10-year (if applicable) Morningstar Rating metrics. The weights are: 100% three-year rating for 36-59 months of total returns, 60% five-year rating/40% three-year rating for 60-119 months of total returns, and 50% 10-year rating/30% five-year rating/20% three-year rating for 120 or more months of total returns. While the 10-year overall star rating formula seems to give the most weight to the 10-year period, the most recent three-year period actually has the greatest impact because it is included in all three rating periods. The following copyright pertains only to Morningstar information. The Morningstar information contained herein 1) is proprietary to Morningstar; 2) may not be copied; and 3) is not warranted to be accurate, complete or timely. Neither Morningstar nor its content providers are responsible for any damages or losses arising from any use of this information. ©2017 Morningstar, Inc. All Rights Reserved.

    Daily Pricing

    prices/dailypricing.xsl
    Past performance is no guarantee of future results.Share price, yield and return will vary and you may have a gain or loss when you sell your shares.
    Y Shares are available only to investors eligible to invest in products at NAV (Net Asset Value).
    NAV returns do not reflect the deduction of sales charges which would lower returns.
    Call 1-800-225-6292 or visit the fund performance page 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.

    Historical Pricing

    Click here for historical pricing.

    Distributions

    Click here for distributions.

    Sales Charges

    Trail fees are paid quarterly to qualifying dealers at a maximum rate of 0.25% on the net assets of your clients' accounts for all funds, with the exception of Pioneer Multi-Asset Ultrashort Income Fund A Shares, which pays 0.20%, and Pioneer Cash Reserves A Shares, which pays 0.05%.

    prices/bankbox.xsl
    • Not FDIC insured
    • May lose value
    • No bank guarantee
    Before investing, consider the product's investment objectives, risks, charges and expenses. Contact your advisor or Amundi Pioneer for a prospectus or summary prospectus containing this information. Read it carefully. To obtain a free prospectus and for information on any Pioneer fund, please download from our web site.
    Neither Amundi Pioneer, nor its representatives, are legal or tax advisors. In addition, Amundi Pioneer does not provide advice or recommendations. The investments you choose should correspond to your needs, goals, and risk tolerance. For assistance in determining your financial situation, please consult an investment professional.
    prices/mstarfootnotes.xsl

    About Morningstar Ratings:

    Ratings are based on past performance, which is no guarantee of future results. The Overall Morningstar RatingTM is based on a weighted average of the star ratings assigned to a fund's three, five, and ten year (as applicable) time periods. The Morningstar Category identifies funds based on their underlying portfolio holdings. Classifications are based on portfolio statistics and compositions over the past three years. For funds less than three years old, category classifications are based on life of the fund. Pioneer Strategic Income Fund was rated exclusively against U.S.-domiciled multisector bond funds as follows: 3, 3 and 4 stars among 243, 192 and 109 funds for the three-, five-, and 10-year periods ended 8/31/17, respectively. The Morningstar Rating is for Class A Shares only. Ratings may vary among share classes.
    Ratings are based on past performance, which is no guarantee of future results. Star ratings do not reflect the effect of any applicable sales load. The Morningstar RatingTM for funds, or "star rating", is calculated for managed products (including mutual funds, variable annuity and variable life subaccounts, exchange-traded funds, closed-end funds and separate accounts) with at least a three-year history. Exchange-traded funds and open-ended mutual funds are considered a single population for comparative purposes. It is calculated based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a managed product's monthly excess performance, placing more emphasis on downward variations and rewarding consistent performance. The top 10% of products in each product category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars, and the bottom 10% receive 1 star. The Overall Morningstar Rating for a managed product is derived from a weighted average of the performance figures associated with its three-, five-, and 10-year (if applicable) Morningstar Rating metrics. The weights are: 100% three-year rating for 36-59 months of total returns, 60% five-year rating/40% three-year rating for 60-119 months of total returns, and 50% 10-year rating/30% five-year rating/20% three-year rating for 120 or more months of total returns. While the 10-year overall star rating formula seems to give the most weight to the 10-year period, the most recent three-year period actually has the greatest impact because it is included in all three rating periods. The following copyright pertains only to Morningstar information. The Morningstar information contained herein 1) is proprietary to Morningstar; 2) may not be copied; and 3) is not warranted to be accurate, complete or timely. Neither Morningstar nor its content providers are responsible for any damages or losses arising from any use of this information. ©2017 Morningstar, Inc. All Rights Reserved.

    Literature

    literature/litfootnotes.xsl
    *SAI = Statement of Additional Information
    Printed copies can also be ordered by visiting Order Literature.
    If you have any questions, call our Sales Desk at 1-800-622-9876.
    All downloaded documents are in Adobe® Acrobat format. To view these documents, your computer must be equipped with the Adobe® Acrobat Reader, available free from Adobe: download Adobe Acrobat Reader.
    literature/bankbox.xsl
    • Not FDIC insured
    • May lose value
    • No bank guarantee
    Before investing, consider the product's investment objectives, risks, charges and expenses. Contact your advisor or Amundi Pioneer for a prospectus or summary prospectus containing this information. Read it carefully. To obtain a free prospectus and for information on any Pioneer fund, please download from our web site.
    Neither Amundi Pioneer, nor its representatives, are legal or tax advisors. In addition, Amundi Pioneer does not provide advice or recommendations. The investments you choose should correspond to your needs, goals, and risk tolerance. For assistance in determining your financial situation, please consult an investment professional.
    literature/mstarfootnotes.xsl

    About Morningstar Ratings:

    Ratings are based on past performance, which is no guarantee of future results. The Overall Morningstar RatingTM is based on a weighted average of the star ratings assigned to a fund's three, five, and ten year (as applicable) time periods. The Morningstar Category identifies funds based on their underlying portfolio holdings. Classifications are based on portfolio statistics and compositions over the past three years. For funds less than three years old, category classifications are based on life of the fund. Pioneer Strategic Income Fund was rated exclusively against U.S.-domiciled multisector bond funds as follows: 3, 3 and 4 stars among 243, 192 and 109 funds for the three-, five-, and 10-year periods ended 8/31/17, respectively. The Morningstar Rating is for Class A Shares only. Ratings may vary among share classes.
    Ratings are based on past performance, which is no guarantee of future results. Star ratings do not reflect the effect of any applicable sales load. The Morningstar RatingTM for funds, or "star rating", is calculated for managed products (including mutual funds, variable annuity and variable life subaccounts, exchange-traded funds, closed-end funds and separate accounts) with at least a three-year history. Exchange-traded funds and open-ended mutual funds are considered a single population for comparative purposes. It is calculated based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a managed product's monthly excess performance, placing more emphasis on downward variations and rewarding consistent performance. The top 10% of products in each product category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars, and the bottom 10% receive 1 star. The Overall Morningstar Rating for a managed product is derived from a weighted average of the performance figures associated with its three-, five-, and 10-year (if applicable) Morningstar Rating metrics. The weights are: 100% three-year rating for 36-59 months of total returns, 60% five-year rating/40% three-year rating for 60-119 months of total returns, and 50% 10-year rating/30% five-year rating/20% three-year rating for 120 or more months of total returns. While the 10-year overall star rating formula seems to give the most weight to the 10-year period, the most recent three-year period actually has the greatest impact because it is included in all three rating periods. The following copyright pertains only to Morningstar information. The Morningstar information contained herein 1) is proprietary to Morningstar; 2) may not be copied; and 3) is not warranted to be accurate, complete or timely. Neither Morningstar nor its content providers are responsible for any damages or losses arising from any use of this information. ©2017 Morningstar, Inc. All Rights Reserved.
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    Overall Morningstar RatingTM




    (out of 243 funds in the Multisector Bond Category)


    Morningstar proprietary ratings reflect risk-adjusted performance as of 8/31/17

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    As of August 31, 2017

    Fund Facts
    CUSIP723884102723884300723884706723884508723884409
    Nasdaq SymbolPSRAXPSRCXSTRKXSTIRXSTRYX
    Inception Date/
    Performance Inception Date
    4/15/19994/15/19994/15/19994/15/19994/15/1999
    Total Net Assets (millions)$1,050.2$708.8$393.8$226.3$3,778.2
    Initial Minimum Invest.$1,000$1,000$5,000,000$0$5,000,000
    Management Fee0.56%0.56%0.56%0.56%0.56%
    Gross Expense Ratio1.04%1.72%0.62%1.35%0.73%

    Initial minimum investment amounts for retirement plans are lower.
    *Class Y shares are not subject to sales charges and are available for limited groups of investors, including institutional investors.


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    Portfolio Characteristics

    As of August 31, 2017

    30-day SEC Yield
    Class A
    Class C
    Class K
    Class R
    Class Y

    3.49%
    2.91%
    3.85%
    3.26%
    3.77%
    Weighted Average Life of Securities7.95 Years
    Weighted Average Maturity11.28 Years
    Duration4.39 Years
    Total Holdings1422
    Turnover110%

    The 30-day SEC yield is based on the hypothetical annualized earning power (investment income only) of the Fund's portfolio securities during the period indicated.

    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. 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 Average Maturity of certain funds might not be a useful measure if they contain securities with principal paydowns, such as mortgage passthroughs. Instead, market participants calculate Average Life, which reflects the average time to receipt of principal payments (scheduled principal payments and projected prepayments).