Form 497 Pioneer Series Trust IV

 							  File Number:333-126384
                                                Filed Pursuant to Rule 497(e) of
                                                      the Securities Act of 1933

                                                                   April 6, 2018


                        PIONEER MULTI-ASSET INCOME FUND


              SUPPLEMENT TO THE PROSPECTUS DATED DECEMBER 1, 2017


FUND SUMMARY
The following replaces the corresponding information under the heading
"Principal investment strategies" in the section entitled "Fund summary":

The fund has the flexibility to invest in a broad range of income-producing
investments, including both debt securities and equity securities. The fund may
invest in the securities of issuers located throughout the world, including in
emerging markets. In selecting investments, the fund's investment adviser
considers both broad economic and investment-specific factors.

The fund may invest in a broad range of issuers and segments of the debt
securities markets. The adviser allocates the fund's debt securities among
different instruments and segments of the debt markets, based on its outlook
for economic, interest rate and political trends. Debt securities may include
instruments and obligations of U.S. and non-U.S. corporate and other
non-governmental entities, those of U.S. and non-U.S. governmental entities,
mortgage-related or mortgage-backed securities (including "sub-prime"
mortgages), asset-backed securities, floating rate loans, convertible
securities, Treasury Inflation Protected Securities ("TIPS") and other
inflation-linked debt securities, subordinated debt securities, event-linked
bonds and other insurance-linked securities, and funds that invest primarily in
debt securities. The fund may invest without limit in debt securities of any
credit quality, including those rated below investment grade (known as "junk
bonds") or, if unrated, of equivalent credit quality as determined by the
adviser. The fund's investments in debt securities rated below investment grade
may include securities that are in default.

The fund invests in debt securities with a broad range of maturities. The
fund's investments may have fixed or variable principal payments and all types
of interest rate payment and reset terms, including fixed rate, adjustable
rate, floating rate, zero coupon, contingent, deferred, payment in kind and
auction rate features. The fund's investments may include instruments that
allow for balloon payments or negative amortization payments. The fund may
invest without limit in debt securities.


                                       


Equity securities include common stocks, rights, warrants, depositary receipts,
funds that invest primarily in equity securities, preferred stock, equity
interests in real estate trusts (REITs), equity-linked notes and master limited
partnerships. Derivative instruments that provide exposure to equity securities
or have similar economic characteristics may be considered equity securities
under this policy.

The fund may invest without limit in debt and equity securities of non-U.S.
issuers, including up to 30% of its total assets in debt and equity securities
of emerging market issuers.

Equity-linked notes (ELNs) are hybrid structured investments that combine the
characteristics of one or more reference underlying securities (usually a
single stock, a basket of stocks or a stock index) and a related equity
derivative, typically in the form of a note paying a stated interest rate.

In allocating assets among debt and equity securities, the adviser considers a
variety of factors expected to influence global economic activity, including
fundamental economic indicators, such as the rates of economic growth and
inflation, monetary policy, geo-political factors, the performance of
securities markets, and the relative value of the U.S. dollar compared to other
currencies. The fund is not required to allocate its investments among debt and
equity securities in any fixed proportion, nor is it limited by the issuer's
geographic location, size or market capitalization. The relative proportions of
the fund's investments in debt and equity securities may change over time based
upon market and economic conditions.

In selecting individual securities to buy and sell, the adviser considers a
security's income prospects relative to perceived risk. The adviser selects
debt securities based upon such factors as a security's yield, liquidity and
rating, an assessment of credit quality, and sector and issuer diversification.
The adviser considers an equity security's potential to provide income in view
of the sustainability of the issuer's earnings and financial condition. In
selecting equity and debt securities, the adviser generally favors those
securities it perceives to be undervalued. The adviser employs fundamental
research in evaluating issuers, taking into account financial condition and
profitability, future capital needs, potential for change in rating, industry
outlook, the competitive environment and management ability. In making these
portfolio decisions, the adviser relies on the knowledge, experience and
judgment of its staff and the staff of its affiliates who have access to a wide
variety of fundamental and quantitative research. In selecting among market
segments and instruments, the adviser considers the relative value


                                       


of particular investments. Investments typically are sold when the adviser's
overall assessment of market and economic conditions changes or the assessments
of the attributes of asset classes or individual holdings change.

The fund may invest in securities and instruments that are not income-producing
for purposes of seeking capital appreciation or managing risk or other
portfolio characteristics. The fund may, but is not required to, use
derivatives, such as options, credit default swaps and interest rate swaps,
forward currency exchange contracts and bond, index, interest rate and currency
futures. The fund may use derivatives for a variety of purposes, including: in
an attempt to hedge against adverse changes in the market price of securities,
interest rates or currency exchange rates; as a substitute for purchasing or
selling securities; to attempt to increase the fund's return as a non-hedging
strategy that may be considered speculative; to manage portfolio
characteristics; and as a cash flow management technique. In addition to
investing in securities denominated in non-U.S. currencies, the fund may hold
non-U.S. currencies and purchase and sell forward currency exchange contracts
in non-U.S. currencies. The fund may invest without limit in derivative
instruments. The fund may choose not to make use of derivatives for a variety
of reasons, and any use may be limited to applicable law and regulations. The
fund also may hold cash or other short-term investments.


PRINCIPAL INVESTMENT STRATEGIES
The following replaces the corresponding information under the heading
"Principal investment strategies" in the section entitled "More on the fund's
investment objectives and strategies":

The fund has the flexibility to invest in a broad range of income-producing
investments, including both debt securities and equity securities. The fund may
invest in the securities of issuers located throughout the world, including in
emerging markets. In selecting investments, Amundi Pioneer Asset Management,
Inc. ("Amundi Pioneer"), the fund's investment adviser, considers both broad
economic and investment-specific factors.

The fund may invest in a broad range of issuers and segments of the debt
securities markets. Amundi Pioneer allocates the fund's debt securities among
different instruments and segments of the debt markets, based on its outlook
for economic, interest rate and political trends. Debt securities may include
instruments and obligations of U.S. and non-U.S. corporate and other
non-governmental entities, those of U.S. and non-U.S. governmental entities,
mortgage-related or mortgage-backed securities (including "sub-prime"


                                       


mortgages), asset-backed securities, floating rate loans, convertible
securities, Treasury Inflation Protected Securities ("TIPS") and other
inflation-linked debt securities, subordinated debt securities, event-linked
bonds and other insurance-linked securities, and funds that invest primarily in
debt securities. The fund may invest without limit in debt securities of any
credit quality, including those rated below investment grade (known as "junk
bonds") or, if unrated, of equivalent credit quality as determined by Amundi
Pioneer. The fund's investments in debt securities rated below investment grade
may include securities that are in default.

The fund invests in debt securities with a broad range of maturities. The
fund's investments may have fixed or variable principal payments and all types
of interest rate payment and reset terms, including fixed rate, adjustable
rate, floating rate, zero coupon, contingent, deferred, payment in kind and
auction rate features. The fund's investments may include instruments that
allow for balloon payments or negative amortization payments. The fund may
invest without limit in debt securities.

Equity securities include common stocks, rights, warrants, depositary receipts,
funds that invest primarily in equity securities, preferred stock, equity
interests in real estate trusts (REITs), equity-linked notes and master limited
partnerships. Derivative instruments that provide exposure to equity securities
or have similar economic characteristics may be considered equity securities
under this policy.

The fund may invest without limit in debt and equity securities of non-U.S.
issuers, including up to 30% of its total assets in debt and equity securities
of emerging market issuers.

Equity-linked notes (ELNs) are hybrid structured investments that combine the
characteristics of one or more reference underlying securities (usually a
single stock, a basket of stocks or a stock index) and a related equity
derivative, typically in the form of a note paying a stated interest rate.

In allocating assets among debt and equity securities, Amundi Pioneer considers
a variety of factors expected to influence global economic activity, including
fundamental economic indicators, such as the rates of economic growth and
inflation, monetary policy, geo-political factors, the performance of
securities markets, and the relative value of the U.S. dollar compared to other
currencies. The fund is not required to allocate its investments among debt and
equity securities in any fixed proportion, nor is it limited by the


                                       


issuer's geographic location, size or market capitalization. The relative
proportions of the fund's investments in debt and equity securities may change
over time based upon market and economic conditions.

In selecting individual securities to buy and sell, Amundi Pioneer considers a
security's income prospects relative to perceived risk. Amundi Pioneer selects
debt securities based upon such factors as a security's yield, liquidity and
rating, an assessment of credit quality, and sector and issuer diversification.
The adviser considers an equity security's potential to provide income in view
of the sustainability of the issuer's earnings and financial condition. In
selecting equity and debt securities, Amundi Pioneer generally favors those
securities it perceives to be undervalued. Amundi Pioneer employs fundamental
research in evaluating issuers, taking into account financial condition and
profitability, future capital needs, potential for change in rating, industry
outlook, the competitive environment and management ability. In making these
portfolio decisions, Amundi Pioneer relies on the knowledge, experience and
judgment of its staff and the staff of its affiliates who have access to a wide
variety of fundamental and quantitative research. In selecting among market
segments and instruments, Amundi Pioneer considers the relative value of
particular investments. Investments typically are sold when Amundi Pioneer's
overall assessment of market and economic conditions changes or the assessments
of the attributes of asset classes or individual holdings change.

The fund may invest in securities and instruments that are not income-producing
for purposes of seeking capital appreciation or managing risk or other
portfolio characteristics. The fund may, but is not required to, use
derivatives, such as options, credit default swaps and interest rate swaps,
forward currency exchange contracts and bond, index, interest rate and currency
futures, for a variety of purposes, including: in an attempt to hedge against
adverse changes in the market price of securities, interest rates or currency
exchange rates; as a substitute for purchasing or selling securities; to
attempt to increase the fund's return as a non-hedging strategy that may be
considered speculative; to manage portfolio characteristics; and as a cash flow
management technique. In addition to investing in securities denominated in
non-U.S. currencies, the fund may hold non-U.S. currencies and purchase and
sell forward currency exchange contracts in non-U.S. currencies. The fund may
invest without limit in derivative instruments. The fund may choose not to make
use of derivatives for a variety of reasons, and any use may be limited by
applicable law and regulations. The fund also may hold cash or other short-term
investments.


The fund's investment strategies and policies may be changed from time to time
without shareholder approval, unless specifically stated otherwise in this
prospectus or in the statement of additional information.


































                                                                   30915-00-0418
                                (Copyright)2018 Amundi Pioneer Distributor, Inc.
                                             Underwriter of Pioneer mutual funds
                                                                     Member SIPC

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