Pioneer AMT-Free Municipal Fund
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September 29, 2021 Pioneer AMT-Free Municipal Fund Supplement to the Prospectus, Summary Prospectus and Statement of Additional Information, each dated April 1, 2021 New expense limitation Effective October 1, 2021, the fund is implementing a new expense limitation as follows: Class Y shares – 0.49% Amundi US has contractually agreed to limit ordinary operating expenses (ordinary operating expenses means all fund expenses other than taxes, brokerage commissions, acquired fund fees and expenses, and extraordinary expenses, such as litigation) to the extent required to reduce fund expenses to the above amount. This expense limitation will be in effect through May 1, 2025. 32673-00-1021 ©2021 Amundi Distributor US, Inc. Underwriter of Pioneer mutual funds Member SIPC September 10, 2021 Pioneer Funds Supplement to the Summary Prospectus and Prospectus, as in effect and as may be amended from time to time, for: Fund Date of Prospectus Pioneer AMT-Free Municipal Fund April 1, 2021 Pioneer High Income Municipal Fund December 18, 2020 Effective November 8, 2021, Pioneer AMT-Free Municipal Fund and Pioneer High Income Municipal Fund are making the following change relating to Class A share purchases. The sales charge breakpoint at which purchases may be made at net asset value (that is, without the imposition of a sales charge) will be reduced from $500,000 to $250,000. The following replaces the first footnote to the “Annual fund operating expenses” table in the “Fund summary” section of each prospectus. 1 Class A purchases of $250,000 or more that are not subject to an initial sales charge may be subject to a contingent deferred sales charge of 1%. See “Sales charges.” The following replaces the “Sales charges for Class A shares” table in the “Sales charges” section of each prospectus. Sales charges for Class A shares Sales charge as % of Offering Net amount Amount of purchase price invested Less than $100,000 4.50 4.71 $100,000 but less than $250,000 3.50 3.63 $250,000 or more -0- -0- 32537-00-0921 ©2021 Amundi Distributor US, Inc. Underwriter of Pioneer mutual funds Member SIPC Click here to view the Fund's Summary Prospectus Click here to view the Fund's Statement of Additional Information Pioneer AMT-Free Municipal Fund Prospectus | April 1, 2021 Class A Shares Class C Shares Class K Shares Class Y Shares PBMFX MNBCX ——- PBYMX Contents Fundsummary............................................... 1 More on the fund’s investment objective and strategies.................17 Moreontherisksofinvestinginthefund...........................25 Management .................................................43 Pricingofshares..............................................45 Choosing a class of shares .......................................47 Distribution and service arrangements .............................51 Sales charges ................................................53 Buying, exchanging and selling shares..............................60 Accountoptions..............................................72 Shareholder services and policies .................................76 Dividends, capital gains and taxes .................................82 Financial highlights ............................................85 Intermediary defined sales charge waiver policies .....................89 Neither the Securities and Exchange Commission nor any state securities agency has approved or disapproved the fund's shares or determined whether this prospectus is accurate or complete. Any representation to the contrary is a crime. Beginning in February 2021, as permitted by regulations adopted by the Securities and Exchange Commission, paper copies of the fund’s shareholder reports are no longer sent by mail, unless you specifically request paper copies of the reports from the fund or from your financial intermediary, such as a broker-dealer, bank or insurance company. Instead, the reports are available on the fund’s website, and you will be notified by mail each time a report is posted and provided with a website link to access the report. You may elect to receive all future reports in paper free of charge. If you invest directly with the fund, you can inform the fund that you wish to continue receiving paper copies of your shareholder reports by calling 1-800-225-6292. If you invest through a financial intermediary, you can contact your financial intermediary to request that you continue to receive paper copies of your shareholder reports. Your election to receive reports in paper will apply to all funds held in your account if you invest through your financial intermediary or all funds held with the Pioneer funds complex if you invest directly. An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Contact your investment professional to discuss how the fund may fit into your portfolio. Fund summary Investment objective As high a level of current interest income exempt from federal income tax as is consistent with the relative stability of capital. Fees and expenses of the fund This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you or your family invest, or agree to invest in the future, at least $100,000 in Class A shares of the Pioneer funds. More information about these and other discounts is available from your investment professional and in the “Sales charges” section of the prospectus beginning on page 53, the “Intermediary defined sales charge waiver policies” section of the prospectus beginning on page 89, and the “Sales charges” section of the statement of additional information beginning on page 47. If you invest in Class K shares or Class Y shares through an investment professional or financial intermediary, that investment professional or financial intermediary may charge you a commission. Such commissions, if any, are not charged by the fund and are not reflected in the fee table or expense example below. 1 Fund summary Shareowner fees (fees paid directly from your investment) Class A Class C Class K Class Y Maximum sales charge (load) when you buy shares (as a percentage of offering price) 4.50% None None None Maximum deferred sales charge (load) (as a percentage of offering price or the amount you receive when you sell shares, whichever is less) None1 1% None None Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment) Class A Class C Class K Class Y Management Fees 0.44% 0.44% 0.44% 0.44% Distribution and Service (12b-1) Fees 0.25% 1.00% 0.00% 0.00% Other Expenses2 0.11% 0.11% 0.06% 0.18% Total Annual Fund Operating Expenses 0.80% 1.55% 0.50% 0.62% Less: Fee Waiver and Expense Reimbursement3 0.00% 0.00% 0.00% -0.07% Net Expenses3 0.80% 1.55% 0.50% 0.55% 1 Class A purchases of $500,000 or more that are not subject to an initial sales charge may be subject to a contingent deferred sales charge of 1%. See “Sales charges.” 2 Other expenses for Class K shares are estimated for the current fiscal year. 3 The fund’s investment adviser has contractually agreed to limit ordinary operating expenses (ordinary operating expenses means all fund expenses other than taxes, brokerage commissions, acquired fund fees and expenses and extraordinary expenses, such as litigation) to the extent required to reduce fund expenses to 0.55% of the average daily net assets attributable to Class Y shares. This expense limitation is in effect through May 1, 2022. There can be no assurance that the adviser will extend the expense limitation beyond such time. Net expenses for a Class may exceed the applicable expense limitation to the extent that the fund incurs excluded expenses. While in effect, the arrangement may be terminated for a class only by agreement of the adviser and the Board of Trustees. Example This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods shown and then, except as indicated, redeem all of your shares at the end of those periods. It also assumes that (a) your investment has a 5% return each year and (b) the fund's total annual operating expenses remain the same except for year one (which considers the effect of the expense limitation). Although your actual costs may be higher or lower, based on these assumptions your costs would be: 2 If you redeem your shares If you do not redeem your shares Number of years you own your shares 135101 3 5 10 Class A $528 $694 $874 $1,395 $528 $694 $874 $1,395 Class C 258 490 845 1,845 158 490 845 1,845 Class K 51 160 280 628 51 160 280 628 Class Y 56 191 339 768 56 191 339 768 Portfolio turnover The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 29% of the average value of its portfolio. Principal investment strategies Normally, the fund invests at least 80% of its net assets (plus the amount of borrowings, if any, for investment purposes) in investment grade municipal bonds with a maturity of more than one year, the interest on which is exempt from regular federal income tax. The fund normally will not invest in securities the interest on which is a tax preference item for purposes of the federal alternative minimum tax (AMT).