Pioneer Strategic Income Fund - Class R Shares Release Date

03-31-18..........................................................................................................................................................................................................................................................................................................................................CategoryMultisector Bond

Investment Objective & StrategyFrom the investment's prospectus

The investment seeks a high level of current income. The fund normally invests at least 80% of its net assets (plus the amount of borrowings, if any, for investment purposes) in debt securities. It invests primarily in debt securities issued or guaranteed by the U.S. government, its agencies or instrumentalities or non-U.S. governmental entities; debt securities of U.S. and non-U.S. corporate issuers; and mortgage-related securities. The fund invests in securities with a broad range of maturities and maintains an average portfolio maturity which varies based upon the judgment of the fund's investment adviser.

Volatility and RiskVolatility as of 03-31-18

Low Moderate High

Investment

Category

Risk Measures as of 03-31-18 Port Avg Rel BC Aggr Rel Cat3 Yr Std Dev 2.89 1.07 0.853 Yr Beta 0.57 . 1.00

Principal RisksCredit and Counterparty, Extension, Inflation-ProtectedSecurities, Prepayment (Call), Currency, Foreign Securities,Loss of Money, Not FDIC Insured, Interest Rate, Market/MarketVolatility, Bank Loans, Convertible Securities, Equity Securities,High-Yield Securities, Industry and Sector Investing, InverseFloaters, Mortgage-Backed and Asset-Backed Securities,Municipal Obligations, Leases, and AMT-Subject Bonds, Other,Preferred Stocks, Repurchase Agreements, Restricted/IlliquidSecurities, U.S. Government Obligations, Derivatives, Leverage,Pricing, Increase in Expenses, Shareholder Activity, AmortizedCost, Credit Default Swaps, Forwards, Management, Zero-Coupon Bond

Important InformationMorningstar Investment Profiles must be accompaniedby Morningstar Disclosure and Glossary.

Funds or their affiliates may pay compensation to Voya®affiliates offering a fund. Such compensation may be paid outof distribution, service and/or 12b-1 fees that are deducted fromthe fund's assets, and/or may be paid directly by the fund'saffiliates. Any fees deducted from fund assets are discussed inthe fund's prospectus and disclosed in the fund fact sheet.Because these fees are paid on an on-going basis, over timethese fees will increase the cost of your investment and maycost you more than paying other types of sales charges. Ifoffered through a retirement program, additional fees andexpenses may be charged under that program. NOT A DEPOSIT.NOT FDIC INSURED. NOT INSURED BY ANY FEDERALGOVERNMENT AGENCY. NOT GUARANTEED BY THEINSTITUTION. MAY GO DOWN IN VALUE.

Portfolio AnalysisComposition as of 02-28-18 % Assets

U.S. Stocks 0.0Non-U.S. Stocks 0.0Bonds 93.7Cash 0.8Other 5.6

Morningstar Fixed Income Style Box™ as of 03-31-18

HighM

edLow

Ltd Mod Ext

Avg Eff Duration 6.99Avg Eff Maturity 9.85

Top 10 Holdings as of 02-28-18 % Assets

United States Treasury Bonds 0.75% SNR 02-15-45 2.01United States Treasury Bonds 1% SNR PI 02-15-46 1.12International Bank for Reconstruction 01-22-21 0.72Wells Fargo & Co Pfd 12-31-49 0.69New Zealand (Government Of) 5.5% SNR P 04-15-23 0.66.......................................................................................................Bank of America Corporation Pfd 12-31-49 0.52International Finance Corporation 6.3% 11-25-24 0.51Federal National Mortgage Association 11-01-44 0.43Federal National Mortgage Association 08-01-47 0.42United States Treasury Bonds 0.875% PI 02-15-47 0.41

Morningstar F-I Sectors as of 02-28-18 % Fund

⁄ Government 9.52› Corporate 44.19€ Securitized 43.55‹ Municipal 1.95fi Cash/Cash Equivalents 0.78± Other 0.01

Credit Analysis: % Bonds as of 03-31-18

AAA 34 BB 12AA 8 B 8A 6 Below B 1BBB 24 Not Rated 6

OperationsGross Prosp Exp Ratio 1.41% of fund assetsNet Prosp Exp Ratio 1.41% of fund assetsManagement Fee 0.56%12b-1 Fee 0.50%Other Fee 0.01%Miscellaneous Fee(s) 0.34%Fund Inception Date 04-01-03Total Fund Assets ($mil) 5,829.2Annual Turnover Ratio % 52.00Fund Family Name Pioneer Investments

Waiver Data Type Exp. Date %

. . . .

Portfolio Manager(s)

Kenneth Taubes. Since 1999.Charles Melchreit. Since 2012.................................................................................................Advisor Amundi Pioneer Asset

Management, Inc.Subadvisor .

Notes

©2018 Morningstar, Inc., Morningstar Investment Profiles™ 312-696-6000. All rights reserved. The information contained herein: (1) is proprietary to Morningstar and/or its content providers; (2) maynot be copied or distributed 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 useof information. Past performance is no guarantee of future performance. Visit our investment website at www.morningstar.com.

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