Pioneer Series Trust IV NCSR Certified annual shareholder report (management investment company)

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 811-21781

Pioneer Series Trust IV

(Exact name of registrant as specified in charter)

60 State Street, Boston, MA 02109

(Address of principal executive offices) (ZIP code)

Christopher J. Kelley, Amundi Asset 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: July 31, 2023

Date of reporting period: August 1, 2022 through July 31, 2023

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 Balanced ESG Fund

Annual Report | July 31, 2023


A: AOBLX	C: PCBCX	K: PCBKX	R: CBPRX	Y: AYBLX

visit us: www.amundi.com/us

Table of Contents

President’s Letter	2
Portfolio Management Discussion	4
Portfolio Summary	14
Prices and Distributions	16
Performance Update	17
Comparing Ongoing Fund Expenses	22
Schedule of Investments	24
Financial Statements	59
Notes to Financial Statements	68
Report of Independent Registered Public Accounting Firm	87
Additional Information	89
Statement Regarding Liquidity Risk Management Program	90
Trustees, Officers and Service Providers	92

Pioneer Balanced ESG Fund | Annual Report | 7/31/231

Table of Contents

President’s Letter

Dear Shareholders,

On February 13, 2023, Amundi US celebrated the 95^th anniversary of Pioneer Fund, the second-oldest mutual fund in the United States. We recognized the anniversary with ringing of the closing bell at the New York Stock Exchange, which seemed fitting for this special milestone.

Pioneer Fund was launched on February 13, 1928 by Phil Carret, one of the earliest proponents of value investing and a leading innovator in the asset management industry. Mr. Carret began investing in the 1920s and founded Pioneer Investments (now Amundi US) in 1928, and was one of the first investors to realize he could uncover value through rigorous, innovative, fundamental research techniques.

Consistent with Mr. Carret’s investment approach and employing many of the same techniques utilized in the 1920s, Amundi US's portfolio managers have adapted Mr. Carret’s philosophy to a new age of “active” investing.

The last few years have seen investors face some unprecedented challenges, from a global pandemic that shuttered much of the world’s economy for months, to geopolitical strife, to rising inflation that has reached levels not seen in decades. Now, more than ever, Amundi US believes active management – that is, making active investment decisions across all of our portfolios – can help mitigate risk during periods of market volatility.

At Amundi US, active management begins with our own fundamental, bottom-up research process. Our team of dedicated research analysts and portfolio managers analyzes each security under consideration, communicating frequently with the management teams of the companies and other entities issuing the securities, and working together to identify those securities that we believe best meet our investment criteria for our family of funds. Our risk management approach begins with each security under consideration, as we strive to develop a deep understanding of the potential opportunity, while considering any potential risk factors.

Today, as shareholders, we have many options. It is our view that active management can serve shareholders well, not only when markets are thriving, but also during periods of market stress. As you consider your long-term investment goals, we encourage you to work with your financial professional to develop an investment plan that paves the way for you to pursue both your short-term and long-term goals.

2Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

We greatly appreciate the trust you have placed in us and look forward to continuing to serve you in the future.

Lisa M. Jones
Head of the Americas, President and CEO of US
Amundi Asset Management US, Inc.
September 2023

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. Past performance is no guarantee of future results.

Pioneer Balanced ESG Fund | Annual Report | 7/31/233

Table of Contents

Portfolio Management Discussion | 7/31/23

In the following interview, Howard Weiss, Bradley Komenda, and Lawrence Zeno discuss the factors that affected the performance of Pioneer Balanced ESG Fund during the 12-month period ended July 31, 2023. Mr. Weiss, CFA, a Senior Vice President and Director of Multi-Asset Solutions, US, and a portfolio manager at Amundi Asset Management US, Inc. (Amundi US), co-manages the Fund, along with Mr. Komenda, Managing Director, Director of Investment Grade Corporates, and a portfolio manager at Amundi US; Mr.Zeno, a Vice President and a portfolio manager at Amundi US; and Fergal Jackson, a Vice President and a portfolio manager at Amundi US.

Q	How did the Fund perform during the 12-month period ended July 31, 2023?
A	Pioneer Balanced ESG Fund’s Class A shares returned 6.51% at net asset value during the 12-month period ended July 31, 2023, while the Fund’s benchmarks, the Standard & Poor’s 500 Index (the S&P 500) and the Bloomberg US Aggregate Bond Index (the Bloomberg Index), returned 13.02% and -3.37%, respectively. During the same 12-month period, the average return of the 739 mutual funds in Morningstar’s 50% to 70% Equity Allocation Funds category was 5.57%.
Q	Could you describe the investment environment during the 12-month period ended July 31, 2023?
A	Entering the period in August 2022, the prospect of continued tightening of monetary policy by various central banks, including the US Federal Reserve (Fed), dominated the market’s focus. With data showing that US year-over-year consumer price inflation (CPI) had reached a new high of 9.1% in June 2022, investors’ expectations were that the Fed would continue to aggressively raise its benchmark federal funds rate target range, which it had begun raising earlier in the year. Indeed, the Fed implemented successive increases of 75 basis points (bps) to the federal funds rate target range at both its July 2022 and September 2022 meetings. (A basis point is equal to 1/100^th of a percentage point.) The Fed’s actions weighed on investors’ sentiment towards credit-sensitive fixed-income securities (such as corporate bonds) and on riskier assets (such as equities), in general. During that portion of the 12-month period (summer 2022), value stocks led performance within equities as the market

4Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

	discounted the more future-based (projected) earnings and cash flows of growth stocks to reflect the Fed’s higher interest-rate regime.
	As post-June 2022 inflation data showed signs of modest easing, investors began to anticipate a pivot by the Fed to a more dovish stance on monetary policy. The shift in market sentiment led to strong bond and stock market returns in October and November of 2022, despite another 75 bps increase in the federal funds target range by the Fed in early November. However, in December 2022, the market soon turned its attention to the potential recessionary effects of the higher interest-rate regime put in place by the Fed, which led riskier assets to give back some of their gains from earlier in the fourth quarter. The Fed then implemented a more modest increase of 50 bps to the federal funds rate target at its December meeting, leaving the target range at 4.25% – 4.50% at the end of 2022, the highest level since the fall of 2007.
	Entering 2023, investors became increasingly optimistic that the Fed and other leading central banks were poised to finally stop raising interest rates. January 2023 saw Treasury yields pull back from their more recent highs on the market’s outlook for a potential easing of monetary policy. That, in turn, boosted performance for bonds in general. In addition, the reopening of China’s economy as the government unwound its “Zero-COVID” policy eased concerns about slowing global economic growth. Against that backdrop, areas of the market that had lagged during the 2022 sell-off, such as growth stocks and corporate credit, outperformed. On February 1, 2023, the Fed increased the federal funds rate target again, but this time by a comparatively moderate 25 bps, bringing the target range to 4.50% – 4.75%.
	Soon after, the spring of 2023 saw the failure of multiple US banks and the collapse of European giant Credit Suisse, raising the prospect of a financial crisis. In response, the Fed implemented a new lending program to support bank liquidity, while market participants began to forecast decreases in the federal funds rate target range by the Fed over the second half of the calendar year. At its March 23 meeting, the Fed went forward with another modest 25 bps increase to the federal funds target, bringing the range to 4.75% ‒ 5.00%. The financial markets

Pioneer Balanced ESG Fund | Annual Report | 7/31/235

Table of Contents

	viewed that increase as an indication that the Fed believed the financial system, overall, remained on solid footing. The Fed would implement another increase to the federal funds target range of 25 bps in early May, bringing the range to 5.00% ‒ 5.25%, before taking a pause at its June meeting. On July 26, however, the Fed increased the federal funds target range by another quarter-point (25 bps), leaving the range at 5.25% ‒ 5.50% as of period-end.
	As of July 31, 2023, the 10-year US Treasury yield stood at 3.97%, an increase of 130 bps relative to the 10-year Treasury’s 2.67% yield 12 months earlier. Within equities, growth stocks notably outperformed their value counterparts over the latter part of the 12-month period as economic data remained surprisingly resilient and the Fed appeared to be nearing the end of its rate-hiking cycle. In particular, headlines around the potential commercial applications of generative Artificial Intelligence (AI) drove strong returns for growth-oriented companies perceived as possible beneficiaries of that secular trend.
Q	How did you broadly position the Fund’s portfolio during the 12-month period ended July 31, 2023?
A	At the start of the period, we had allocated approximately 60% of the Fund’s invested assets to equities and nearly 38% to fixed-income securities. As of July 31, 2023, the Fund’s equity allocation stood at roughly 63% in equities, with roughly 34% of the Fund’s invested assets allocated to fixed-income investments (with the remainder invested in cash/cash equivalents). The portfolio’s strategic target allocations typically have been 62.5% equity/37.5% fixed income.
Q	Could you review the Fund’s commitment to environmental, social, and governance (ESG) investing?
A	The Fund applies ESG criteria to its investments, and Amundi US integrates ESG factors in our fundamental research and investment selection processes. Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of borrowings, if any, for investment purposes) in securities of issuers that Amundi US believes adhere to the Fund’s ESG

6Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

	criteria. Amundi US believes that ESG-related information helps us gain a more complete understanding of a company and its business.
	For purposes of the Fund's 80% investment policy, “ESG criteria” is defined as the exclusion of investments issued by companies significantly involved in certain business activities, including but not limited to the production of alcohol, tobacco products, and certain controversial military weapons (as defined by the Fund's prospectus), and the operation of thermal coal mines and gambling casinos and other gaming businesses. Amundi US also considers pertinent ESG information, including ESG ratings, in seeking to avoid investing in companies perceived to have the most ESG-related risk.
Q	What specific investments within the portfolio’s equity allocation had noteworthy effects on the Fund’s benchmark-relative performance during the 12-month period ended July 31, 2023?
A	Our equity investment strategy has emphasized portfolio diversification, and seeking to own shares of companies that we believe feature reasonable valuations, good ESG standings (for sustainable performance), and that have a history of consistent capital allocation methodologies, which often has included the payment of dividends* as well as share buybacks.
	Sector allocation results detracted modestly from the equity portfolio’s (and the Fund’s) performance versus the S&P 500 Index for the 12-month period, while stock selection results had an essentially neutral effect on the Fund’s benchmark-relative performance.
	Positive contributions to the Fund’s benchmark-relative performance on the equity side were led by stock selection results within the financials and industrials sectors, along with the portfolio’s lack of exposure to utilities stocks, which lagged during the 12-month period. Conversely, stock selection results within the consumer discretionary sector and the Fund’s underweight to information technology stocks versus the S&P 500 weighed most heavily on benchmark-relative returns.

*	Diversification does not assure a profit nor protect against loss.

**	Dividends are not guaranteed.

Pioneer Balanced ESG Fund | Annual Report | 7/31/237

Table of Contents

	With regard to individual equity positions, positive contributions to the Fund’s benchmark-relative performance for the 12-month period were led by the portfolio’s overweight position in pharmaceutical and medical product distributor Cardinal Health, within the health care sector. Within the consumer discretionary sector, a lack of portfolio exposure to Tesla proved additive for the Fund’s relative returns, as the electric vehicle manufacturer has been compelled to lower prices in response to increased competition. Within the information technology sector, the Fund’s out-of-benchmark position in automated test equipment manufacturer National Instruments contributed positively to relative performance, as the company’s stock price rallied in the wake of its receiving a merger offer.
	On the downside, the biggest individual detractor from the Fund’s benchmark-relative results for the 12-month period was a lack of exposure to NVIDIA (information technology), as the semiconductor company holds a prominent position as a provider of chips deployed in AI applications, and AI-related stocks rallied strongly over the period. Similarly, a lack of portfolio exposure to Facebook parent Meta, within the communication services sector, weighed on the Fund’s benchmark-relative returns, as the social media giant’s efforts to trim capital expenditures in response to a weak advertising climate were well received by the market. Finally, the Fund’s overweight position versus the S&P 500 in Amazon.com, within the consumer discretionary sector, also detracted from relative returns as the online retailer’s growth has slowed in the post-pandemic economic climate.
Q	What investment strategies within the portfolio’s fixed-income allocations had noteworthy effects on the Fund’s benchmark-relative performance during the 12-month period ended July 31, 2023?
A	The Fund’s positioning along the yield curve had an essentially neutral effect on performance relative to the Bloomberg Index, as the negative impact from the portfolio’s overall long-duration stance versus the benchmark was offset by the positive effects of being overweight to the long end of the yield curve, which outperformed both the front and belly (middle) parts of the curve. (A yield curve is a line that plots the interest rates, at a set point in time, of bonds having equal credit quality but

8Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

	differing maturity dates. Duration is a measure of the sensitivity of the price, or the value of principal, of a fixed-income investment to a change in interest rates, expressed as a number of years.)
	The Fund’s sector allocation results within the fixed-income portion of the portfolio meaningfully contributed to positive relative performance versus the Bloomberg Index for the 12-month period. Most notably, relative returns benefited from the Fund’s overweight to the debt of issuers within the financials sector, within corporate credit. A portfolio overweight versus the Bloomberg Index to non-agency mortgage-backed securities (MBS) and an underweight to US Treasuries also proved additive for the Fund’s benchmark-relative performance.
	On the negative side within fixed income, the Fund’s overweight to commercial MBS (CMBS) was the lone meaningful detractor from benchmark-relative returns from an asset allocation standpoint. Security selection results within CMBS helped offset some of the negative effects of asset allocation, as we avoided investing the Fund in some of the weaker CMBS segments.
	The Fund’s overall security selection results were a positive contributor to benchmark-relative performance within fixed income. Along with the contribution from selection results within CMBS, the Fund experienced strong selection results within the financials sector, as our focus on investing in highly regulated, systemically important banks largely insulated the portfolio from the pitfalls resulting from the banking crisis during the spring of 2023. Within the portfolio’s allocation to agency MBS, an overweight versus the Bloomberg Index to higher-coupon mortgage pools modestly supported the Fund’s benchmark-relative results, as agency MBS backed by lower-coupon pools suffered a performance shortfall driven by duration extension during a period featuring rising mortgage rates.
Q	Did the Fund have any exposure to derivative securities during the 12-month period ended July 31, 2023? If so, did the use of derivatives have a material effect on performance?
A	Yes, we invested the Fund in Treasury futures as part of our duration-management strategy within the fixed-income portion of the portfolio. We believe the use of Treasury futures allows us

Pioneer Balanced ESG Fund | Annual Report | 7/31/239

Table of Contents

	to express our views on duration and yield-curve positioning in the most efficient manner. The use of Treasury futures, mainly for hedging purposes, had a negligible effect on the Fund’s relative performance during the 12-month period.
Q	Did the Fund’s yield, or distributions*** to shareholders, change during the 12-month period ended July 31, 2023?
A	Rising Treasury yields over the course of the 12-month period resulted in an increase in the Fund’s distribution rate, while having a negative effect on total returns, due to declining bond prices.
Q	What is your investment outlook heading into the Fund’s new fiscal year?
A	With elevated inflation proving to be sticky and the Fed committed to bringing inflation down to its 2% long-term target, we believe the federal funds rate target range will remain “higher for longer.” The market now appears to agree with this view, as expectations for the Fed’s first interest-rate cut have been pushed out to May 2024. We believe financial conditions will become more restrictive, and that the likelihood of a recession has increased as banks have tightened lending standards and as the Fed has maintained higher rates, given lingering inflation concerns. Consequently, we expect to maintain a relatively defensive posture in the portfolio as recession risks increase over the remainder of the calendar year, with weak manufacturing activity and higher mortgage rates weighing on the economy.
	As is typically the case during recessions, we would expect some credit-oriented bond issuers to face pressures, which could lead to increased ratings downgrades. However, we do not expect a deep recession, such as during the global financial crisis (GFC) of 2008. In our opinion, the economy will likely be on the upswing and the default rate headed lower at some point in 2024. We expect that by 2024 inflation will have fallen closer to the Fed’s targeted 2% area and that Treasury yields will be lower than today’s levels. In that scenario, we expect the default rate to remain lower than what we saw in the wake of the GFC.

***	Distributions are not guaranteed.

10Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

In our view, US fixed-income duration exposure remains attractive in both nominal and inflation-indexed terms. As spreads in credit-oriented sectors have narrowed back to early March (pre-bank crisis) levels, we have been selectively reducing corporate, securitized credit and agency MBS exposures. However, the Fund’s fixed-income positioning will actively evolve along with shifts in our outlook and views on relative valuations. (Credit spreads are commonly defined as the differences in yield between Treasuries and other types of fixed-income securities with similar maturities.)

At period-end, within the Fund’s equity portfolio, the largest sector overweights relative to the S&P 500 were to health care and energy. Within the health care sector, the portfolio has been tilted toward holdings of life sciences and biotechnology companies. The largest underweight in the Fund’s equity portfolio versus the S&P 500 as of period-end was to the information technology sector, as it is anticipated that continued tightening of monetary policy by the Fed and other central banks could compress valuations and limit future growth potential for companies in the sector.

Pioneer Balanced ESG Fund | Annual Report | 7/31/2311

Table of Contents

Please refer to the Schedule of Investments on pages 24 - 58 for a full listing of Fund securities.

All investments are subject to risk, including the possible loss of principal. In the past several years, financial markets have experienced increased volatility and heightened uncertainty. The market prices of securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic, political, or regulatory conditions, recessions, inflation, changes in interest or currency rates, lack of liquidity in the bond markets, the spread of infectious illness or other public health issues, armed conflict including Russia's military invasion of Ukraine, sanctions against Russia, other nations or individuals or companies and possible countermeasures, market disruptions caused by tariffs, trade disputes or other government actions, or adverse investor sentiment. These conditions may continue, recur, worsen or spread.

The Fund generally excludes corporate issuers that do not meet or exceed minimum ESG standards. Excluding specific issuers limits the universe of investments available to the Fund, which may mean forgoing some investment opportunities available to funds without similar ESG standards.

The market price of securities may fluctuate when interest rates change. 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.

Until recently, a commonly used reference rate for floating rate securities was LIBOR (London Interbank Offered Rate). Publication of most LIBOR settings has ceased on a representative basis. The impact of the transition from LIBOR on the Fund's transactions and financial markets generally cannot yet be determined.

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 US Government-sponsored entities (e.g., FNMA, Freddie Mac) are neither guaranteed nor issued by the US 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 prepayments.

12Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Investments in high-yield or lower rated securities are subject to greater-thanaverage price volatility, illiquidity and possibility of default.

Investing in foreign and/or emerging markets securities involves risks relating to interest rates, currency exchange rates, economic, and political conditions.

The portfolio invests in REIT (real estate investment trust) securities, the value of which can fall for a variety of reasons, such as declines in rental income, fluctuating interest rates, poor property management, environmental liabilities, uninsured damage, increased competition, or changes in real estate tax laws.

For more information on this or any Pioneer fund, please visit amundi.com/usinvestors or call 1-800-622-9876. This material must be preceded or accompanied by the Fund's current prospectus or summary prospectus.

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. Past performance is not a guarantee of future results.

Pioneer Balanced ESG Fund | Annual Report | 7/31/2313

Table of Contents

Portfolio Summary | 7/31/23

Portfolio Diversification

(As a percentage of total investments)*

Sector Distribution

(As a percentage of total investments)*

14Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

10 Largest Holdings

(As a percentage of total investments)*
1.	Alphabet, Inc., Class A	5.06%
2.	Microsoft Corp.	3.60
3.	U.S. Treasury Bonds, 3.125%, 5/15/48	2.61
4.	Medtronic Plc	1.87
5.	Visa, Inc., Class A	1.72
6.	Cisco Systems, Inc.	1.69
7.	Advanced Micro Devices, Inc.	1.68
8.	Ferguson Plc	1.51
9.	Cardinal Health, Inc.	1.50
10.	Adobe, Inc.	1.50


*	Excludes short-term investments and all derivative contracts except for options purchased. The Fund is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any securities.

(l) Pioneer ILS Interval Fund is an affiliated closed-end fund managed by Amundi Asset Management US, Inc. (the “Adviser”).

Pioneer Balanced ESG Fund | Annual Report | 7/31/2315

Table of Contents

Prices and Distributions | 7/31/23

Net Asset Value per Share

Class	7/31/23	7/31/22
A	$ 9.95	$9.66
C	$ 9.84	$9.57
K	$ 9.92	$9.64
R	$ 9.97	$9.68
Y	$10.04	$9.74

Distributions per Share: 8/1/22 - 7/31/23

Class	Net Investment Income	Short-Term Capital Gains	Long-Term Capital Gains
A	$0.1779	$—	$0.1317
C	$0.1205	$—	$0.1317
K	$0.2050	$—	$0.1317
R	$0.1514	$—	$0.1317
Y	$0.2040	$—	$0.1317

Index Definitions

The Standard & Poor’s 500 Index is an unmanaged, commonly used measure of the broad U.S. stock market. The Bloomberg US Aggregate Bond Index is an unmanaged measure of the US bond market. Indices are unmanaged and their returns assume reinvestment of dividends and do not reflect any fees or expenses. It is not possible to invest directly in an index.

The indices defined here pertain to the “Value of $10,000 Investment” and “Value of $5 Million Investment” charts on pages 17 - 21 .

16Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Performance Update | 7/31/23

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 Balanced ESG Fund at public offering price during the periods shown, compared to that of the Standard & Poor’s 500 Index and the Bloomberg US Aggregate Bond Index.

Average Annual Total Returns (As of July 31, 2023)
Period	Net Asset Value (NAV)	Public Offering Price (POP)	S&P 500 Index	Bloomberg US Aggregate Bond Index
10 Years	7.33%	6.83%	12.66%	1.50%
5 Years	6.82	5.85	12.20	0.75
1 Year	6.51	1.66	13.02	-3.37

Expense Ratio
(Per prospectus dated December 1, 2022)

Gross

0.95%

Value of $10,000 Investment

Call 1-800-225-6292 or visit www.amundi.com/us 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. NAV returns would have been lower had sales charges been reflected. POP returns reflect deduction of the 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 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.

Please see the financial highlights for a more current expense ratio.

Pioneer Balanced ESG Fund | Annual Report | 7/31/2317

Table of Contents

Performance Update | 7/31/23

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 Balanced ESG Fund during the periods shown, compared to that of the Standard & Poor’s 500 Index and the Bloomberg US Aggregate Bond Index.

Average Annual Total Returns (As of July 31, 2023)
Period	Net Asset Value (NAV)	Public Offering Price (POP)	S&P 500 Index	Bloomberg US Aggregate Bond Index
10 Years	6.52%	6.52%	12.66%	1.50%
5 Years	6.01	6.01	12.20	0.75
1 Year	5.69	4.69	13.02	-3.37

Expense Ratio
(Per prospectus dated December 1, 2022)

Gross

1.69%

Value of $10,000 Investment

Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.

Class C shares held for less than one year are subject to a 1% contingent deferred sales charge (CDSC). “If Held” results represent the percent change in net asset value per share. “If Redeemed” returns reflect deduction of the CDSC for the one-year period, assuming a complete redemption of shares at the last price calculated on the last business day of the period, and no CDSC for the five- and 10-year periods. 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.

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.

Please see the financial highlights for a more current expense ratio.

18Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Performance Update | 7/31/23

Class K Shares

Investment Returns

The mountain chart on the right shows the change in value of a $5 million investment made in Class K shares of Pioneer Balanced ESG Fund during the periods shown, compared to that of the Standard & Poor’s 500 Index and the Bloomberg US Aggregate Bond Index.

Average Annual Total Returns (As of July 31, 2023)
Period	Net Asset Value (NAV)	S&P 500 Index	Bloomberg US Aggregate Bond Index
10 Years	7.55%	12.66%	1.50%
5 Years	7.12	12.20	0.75
1 Year	6.72	13.02	-3.37

Expense Ratio
(Per prospectus dated December 1, 2022)

Gross

0.65%

Value of $5 Million Investment

Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.

The performance shown for Class K shares for the period prior to the commencement of operations of Class K shares on December 1, 2015, 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 on December 1, 2015, would have been higher than the performance shown. For the period beginning December 1, 2015, 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. 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.

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.

Please see the financial highlights for a more current expense ratio.

Pioneer Balanced ESG Fund | Annual Report | 7/31/2319

Table of Contents

Performance Update | 7/31/23

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 Balanced ESG Fund during the periods shown, compared to that of the Standard & Poor’s 500 Index and the Bloomberg US Aggregate Bond Index.

Average Annual Total Returns (As of July 31, 2023)
Period	Net Asset Value (NAV)	S&P 500 Index	Bloomberg US Aggregate Bond Index
10 Years	7.12%	12.66%	1.50%
5 Years	6.52	12.20	0.75
1 Year	6.19	13.02	-3.37

Expense Ratio
(Per prospectus dated December 1, 2022)

Gross

1.20%

Value of $10,000 Investment

Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.

The performance shown for Class R shares for the period prior to the commencement of operations of Class R shares on July 1, 2015, 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 R shares, the performance of Class R shares prior to their inception would have been higher than the performance shown. For the period beginning July 1, 2015, the actual performance of Class R shares is reflected. 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.

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.

Please see the financial highlights for a more current expense ratio.

20Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Performance Update | 7/31/23

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 Balanced ESG Fund during the periods shown, compared to that of the Standard & Poor’s 500 Index and the Bloomberg US Aggregate Bond Index.

Average Annual Total Returns (As of July 31, 2023)
Period	Net Asset Value (NAV)	S&P 500 Index	Bloomberg US Aggregate Bond Index
10 Years	7.62%	12.66%	1.50%
5 Years	7.15	12.20	0.75
1 Year	6.85	13.02	-3.37

Expense Ratio (Per prospectus dated December 1, 2022)
Gross	Net
0.75%	0.65%

Value of $5 Million Investment

Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.

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.

The net expense ratio reflects the contractual expense limitation currently in effect through December 1, 2023 for Class Y shares. There can be no assurance that Amundi US 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.

Please see the financial highlights for more current expense ratios.

Pioneer Balanced ESG Fund | Annual Report | 7/31/2321

Table of Contents

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 ÷ $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 Balanced ESG Fund

Based on actual returns from February 1, 2023 through July 31, 2023.

Share Class	A	C	K	R	Y
Beginning Account Value on 2/1/23	$1,000.00	$1,000.00	$1,000.00	$1,000.00	$1,000.00
Ending Account Value (after expenses) on 7/31/23	$1,054.10	$1,050.20	$1,055.30	$1,052.90	$1,056.90
Expenses Paid During Period*	$4.79	$8.59	$3.31	$6.36	$3.31


*	Expenses are equal to the Fund’s annualized expense ratio of 0.94%, 1.69%, 0.65%, 1.25%, and 0.65% for Class A, Class C, Class K, Class R, and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 181/365 (to reﬂect the one-half year period).

22Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

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 Balanced ESG Fund

Based on a hypothetical 5% return per year before expenses, reflecting the period from February 1, 2023 through July 31, 2023.

Share Class	A	C	K	R	Y
Beginning Account Value on 2/1/23	$1,000.00	$1,000.00	$1,000.00	$1,000.00	$1,000.00
Ending Account Value (after expenses) on 7/31/23	$1,020.13	$1,016.41	$1,021.57	$1,018.60	$1,021.57
Expenses Paid During Period*	$4.71	$8.45	$3.26	$6.26	$3.26


*	Expenses are equal to the Fund’s annualized expense ratio of 0.94%, 1.69%, 0.65%, 1.25%, and 0.65% for Class A, Class C, Class K, Class R, and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 181/365 (to reﬂect the one-half year period).

Pioneer Balanced ESG Fund | Annual Report | 7/31/2323

Table of Contents

Schedule of Investments | 7/31/23

Principal Amount USD ($)		Value
	UNAFFILIATED ISSUERS — 102.0%
	Senior Secured Floating Rate Loan Interests — 0.1% of Net Assets*(a)
	Chemicals-Diversified — 0.0%†
39,500	LSF11 A5 HoldCo LLC, Term Loan, 8.933% (Term SOFR + 350 bps), 10/15/28	$ 39,130
	Total Chemicals-Diversified	$39,130


	Chemicals-Specialty — 0.0%†
107,800	Mativ Holdings, Inc., Term B Loan, 9.183% (Term SOFR + 375 bps), 4/20/28	$ 104,835
	Total Chemicals-Specialty	$104,835


	Finance-Leasing Company — 0.0%†
71,861	Avolon TLB Borrower 1 (US) LLC, Term B-4 Loan, 6.855% (Term SOFR + 150 bps), 2/12/27	$ 71,541
	Total Finance-Leasing Company	$71,541


	Medical-Wholesale Drug Distribution — 0.0%†
60,938	Owens & Minor, Inc., Term B-1 Loan, 8.715% (Term SOFR + 375 bps), 3/29/29	$ 61,014
	Total Medical-Wholesale Drug Distribution	$61,014


	Metal Processors & Fabrication — 0.0%†
98,250	Grinding Media, Inc. (Molycop, Ltd.), First Lien Initial Term Loan, 9.53% (Term SOFR + 400 bps), 10/12/28	$ 96,531
	Total Metal Processors & Fabrication	$96,531


	REITS-Storage — 0.1%
165,812	Iron Mountain Information Management LLC, Incremental Term B Loan , 7.183% (LIBOR + 175 bps), 1/2/26	$ 165,536
	Total REITS-Storage	$165,536


	Total Senior Secured Floating Rate Loan Interests (Cost $541,963)	$538,587

Shares
	Common Stocks — 62.9% of Net Assets
	Air Freight & Logistics — 0.4%
9,639	United Parcel Service, Inc., Class B	$ 1,803,746
	Total Air Freight & Logistics	$1,803,746

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

24Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Shares		Value
	Automobiles — 0.8%
44,114	Honda Motor Co., Ltd. (A.D.R.)	$ 1,408,119
100,800	Subaru Corp.	1,903,484
	Total Automobiles	$3,311,603


	Banks — 2.2%
43,366	PNC Financial Services Group, Inc.	$ 5,936,372
79,246	Regions Financial Corp.	1,614,241
41,119	Truist Financial Corp.	1,365,973
	Total Banks	$8,916,586


	Beverages — 0.9%
19,873	PepsiCo., Inc.	$ 3,725,393
	Total Beverages	$3,725,393


	Biotechnology — 1.2%
32,135	AbbVie, Inc.	$ 4,806,753
	Total Biotechnology	�� $4,806,753


	Building Products — 1.2%
74,166	Johnson Controls International Plc	$ 5,158,245
	Total Building Products	$5,158,245


	Capital Markets — 1.7%
21,437	CME Group, Inc.	$ 4,265,105
131,758	UBS Group AG	2,921,075
	Total Capital Markets	$7,186,180


	Chemicals — 0.5%
7,315	Air Products and Chemicals, Inc.	$ 2,233,489
	Total Chemicals	$2,233,489


	Communications Equipment — 2.8%
129,541	Cisco Systems, Inc.	$ 6,741,314
16,356	Motorola Solutions, Inc.	4,688,120
	Total Communications Equipment	$11,429,434


	Construction Materials — 1.1%
78,258	CRH Plc (A.D.R.)	$ 4,718,957
	Total Construction Materials	$4,718,957


	Electrical Equipment — 1.5%
24,162	Eaton Corp. Plc	$ 4,960,942
35,193	Prysmian S.p.A.	1,402,683
	Total Electrical Equipment	$6,363,625

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2325

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Shares		Value
	Electronic Equipment, Instruments & Components — 0.6%
17,871	TE Connectivity, Ltd.	$ 2,564,310
	Total Electronic Equipment, Instruments & Components	$2,564,310


	Entertainment — 1.2%
54,883(b)	Walt Disney Co.	$ 4,878,550
	Total Entertainment	$4,878,550


	Financial Services — 1.7%
28,791	Visa, Inc., Class A	$ 6,844,485
	Total Financial Services	$6,844,485


	Food Products — 1.4%
55,538	Lamb Weston Holdings, Inc.	$ 5,755,403
	Total Food Products	$5,755,403


	Health Care Equipment & Supplies — 2.5%
8,468(b)	Intuitive Surgical, Inc.	$ 2,747,019
84,850	Medtronic Plc	7,446,436
	Total Health Care Equipment & Supplies	$10,193,455


	Health Care Providers & Services — 3.3%
65,319	Cardinal Health, Inc.	$ 5,974,729
15,412	Cigna Group	4,548,081
7,146	Elevance Health, Inc.	3,370,268
	Total Health Care Providers & Services	$13,893,078


	Hotels, Restaurants & Leisure — 2.0%
117,119	Cedar Fair LP	$ 4,561,785
5,249	Vail Resorts, Inc.	1,236,087
32,748	Wyndham Hotels & Resorts, Inc.	2,551,724
	Total Hotels, Restaurants & Leisure	$8,349,596


	Household Durables — 0.6%
27,559	Sony Group Corp. (A.D.R.)	$ 2,579,522
	Total Household Durables	$2,579,522


	Household Products — 0.7%
36,610	Reckitt Benckiser Group Plc	$ 2,742,894
	Total Household Products	$2,742,894


	Insurance — 1.4%
14,775	Chubb, Ltd.	$ 3,020,158
51,249	Sun Life Financial, Inc.	2,696,210
	Total Insurance	$5,716,368

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

26Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Shares		Value
	Interactive Media & Services — 4.9%
151,829(b)	Alphabet, Inc., Class A	$ 20,150,745
	Total Interactive Media & Services	$20,150,745


	Life Sciences Tools & Services — 0.5%
9,402(b)	IQVIA Holdings, Inc.	$ 2,103,792
	Total Life Sciences Tools & Services	$2,103,792


	Machinery — 0.9%
8,394	Deere & Co.	$ 3,606,062
	Total Machinery	$3,606,062


	Metals & Mining — 1.8%
9,813	Reliance Steel & Aluminum Co.	$ 2,873,835
106,116	Teck Resources, Ltd., Class B	4,714,734
	Total Metals & Mining	$7,588,569


	Oil, Gas & Consumable Fuels — 4.1%
29,080	Phillips 66	$ 3,243,874
16,622	Pioneer Natural Resources Co.	3,751,087
59,442	Shell Plc, (A.D.R.)	3,663,410
62,846	Targa Resources Corp.	5,152,744
9,914	Valero Energy Corp.	1,278,014
	Total Oil, Gas & Consumable Fuels	$17,089,129


	Pharmaceuticals — 2.3%
13,015	Eli Lilly & Co.	$ 5,915,968
20,210	Merck KGaA	3,550,899
	Total Pharmaceuticals	$9,466,867


	Professional Services — 0.7%
11,808	Automatic Data Processing, Inc.	$ 2,919,646
	Total Professional Services	$2,919,646


	Semiconductors & Semiconductor Equipment — 3.5%
58,554(b)	Advanced Micro Devices, Inc.	$ 6,698,578
12,537	Analog Devices, Inc.	2,501,508
4,309	Lam Research Corp.	3,095,973
24,864	Microchip Technology, Inc.	2,335,724
	Total Semiconductors & Semiconductor Equipment	$14,631,783


	Software — 5.8%
10,928(b)	Adobe, Inc.	$ 5,968,546
42,698	Microsoft Corp.	14,343,112
31,135	Oracle Corp.	3,649,956
	Total Software	$23,961,614


	Specialized REITs — 1.0%
14,768	Crown Castle, Inc.	$ 1,599,227

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2327

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Shares		Value
	Specialized REITs — (continued)
8,278	Digital Realty Trust, Inc.	$ 1,031,604
1,963	Equinix, Inc.	1,589,873
	Total Specialized REITs	$4,220,704


	Specialty Retail — 1.9%
11,026	Home Depot, Inc.	$ 3,680,920
50,566	TJX Cos., Inc.	4,375,476
	Total Specialty Retail	$8,056,396


	Technology Hardware, Storage & Peripherals — 3.0%
335,956	Hewlett Packard Enterprise Co.	$ 5,838,915
104,992(b)	Pure Storage, Inc., Class A	3,883,654
1,957	Samsung Electronics Co., Ltd. (G.D.R.) (144A)	2,663,477
	Total Technology Hardware, Storage & Peripherals	$12,386,046


	Textiles, Apparel & Luxury Goods — 0.5%
51,142	Tapestry, Inc.	$ 2,206,777
	Total Textiles, Apparel & Luxury Goods	$2,206,777


	Trading Companies & Distributors — 2.3%
57,913(b)	AerCap Holdings NV	$ 3,695,428
37,356	Ferguson Plc	6,037,477
	Total Trading Companies & Distributors	$9,732,905


	Total Common Stocks (Cost $182,358,274)	$261,292,707

Principal Amount USD ($)
	Asset Backed Securities — 2.0% of Net Assets
72,157	Accelerated LLC, Series 2021-1H, Class C, 2.35%, 10/20/40 (144A)	$ 64,177
300,000	Amur Equipment Finance Receivables XI LLC, Series 2022-2A, Class D, 7.25%, 5/21/29 (144A)	293,058
100,000	Amur Equipment Finance Receivables XII LLC, Series 2023-1A, Class C, 6.36%, 12/20/29 (144A)	99,719
300,000(a)	Arbor Realty Commercial Real Estate Notes, Ltd., Series 2021-FL3, Class C, 7.186% (1 Month Term SOFR + 196 bps), 8/15/34 (144A)	282,973
250,000(a)	Arbor Realty Commercial Real Estate Notes, Ltd., Series 2022-FL1, Class C, 7.368% (SOFR30A + 230 bps), 1/15/37 (144A)	237,917
400,000(a)	Arbor Realty Commercial Real Estate Notes, Ltd., Series 2022-FL2, Class C, 8.672% (1 Month Term SOFR + 345 bps), 5/15/37 (144A)	390,697

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

28Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Asset Backed Securities — (continued)
250,000(a)	Benefit Street Partners CLO XIX, Ltd., Series 2019-19A, Class D, 9.37% (3 Month Term SOFR + 406 bps), 1/15/33 (144A)	$ 243,433
198,398	Blackbird Capital Aircraft, Series 2021-1A, Class A, 2.443%, 7/15/46 (144A)	171,132
160,000(a)	BSPRT Issuer, Ltd., Series 2022-FL8, Class C, 7.368% (SOFR30A + 230 bps), 2/15/37 (144A)	152,514
132,141	BXG Receivables Note Trust, Series 2018-A, Class C, 4.44%, 2/2/34 (144A)	124,119
250,000(a)	Carlyle US CLO, Ltd., Series 2019-4A, Class CR, 8.508% (3 Month Term SOFR + 320 bps), 4/15/35 (144A)	234,664
131,947(c)	Cascade MH Asset Trust, Series 2019-MH1, Class A, 4.00%, 11/25/44 (144A)	124,432
150,000	Cascade MH Asset Trust, Series 2021-MH1, Class M1, 2.992%, 2/25/46 (144A)	109,965
200,000	Commercial Equipment Finance LLC, Series 2021-A, Class C, 3.55%, 12/15/28 (144A)	187,306
400,000	Continental Finance Credit Card ABS Master Trust, Series 2022-A, Class A, 6.19%, 10/15/30 (144A)	383,934
104,284	CoreVest American Finance Trust, Series 2020-3, Class A, 1.358%, 8/15/53 (144A)	94,246
500,000	Crossroads Asset Trust, Series 2021-A, Class D, 2.52%, 1/20/26 (144A)	480,035
100,000	DataBank Issuer, Series 2021-1A, Class B, 2.65%, 2/27/51 (144A)	85,999
193,000	Domino's Pizza Master Issuer LLC, Series 2019-1A, Class A2, 3.668%, 10/25/49 (144A)	168,309
30,000	Drive Auto Receivables Trust, Series 2020-2, Class D, 3.05%, 5/15/28	29,455
400,000(c)	Finance of America HECM Buyout, Series 2022-HB1, Class M3, 5.084%, 2/25/32 (144A)	347,007
40,160	Foundation Finance Trust, Series 2021-1A, Class A, 1.27%, 5/15/41 (144A)	35,766
341,348(a)	Gracie Point International Funding, Series 2022-2A, Class A, 7.828% (SOFR30A + 275 bps), 7/1/24 (144A)	341,390
125,000(a)	HGI CRE CLO, Ltd., Series 2021-FL2, Class C, 7.136% (1 Month USD LIBOR + 180 bps), 9/17/36 (144A)	117,824
196,500	HOA Funding LLC - HOA, Series 2021-1A, Class A2, 4.723%, 8/20/51 (144A)	162,186
118,674	Home Partners of America Trust, Series 2019-1, Class D, 3.406%, 9/17/39 (144A)	104,926
166,025	Home Partners of America Trust, Series 2019-2, Class E, 3.32%, 10/19/39 (144A)	140,589
450,000(a)	MF1, Ltd., Series 2021-FL7, Class D, 7.894% (1 Month Term SOFR + 266 bps), 10/16/36 (144A)	419,594

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2329

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Asset Backed Securities — (continued)
37,393	Mosaic Solar Loan Trust, Series 2019-2A, Class A, 2.88%, 9/20/40 (144A)	$ 32,509
93,762	Mosaic Solar Loan Trust, Series 2020-1A, Class A, 2.10%, 4/20/46 (144A)	80,188
150,000	Nelnet Student Loan Trust, Series 2021-A, Class B1, 2.85%, 4/20/62 (144A)	122,485
17,427	NMEF Funding LLC, Series 2019-A, Class C, 3.30%, 8/17/26 (144A)	17,404
100,000	NMEF Funding LLC, Series 2021-A, Class C, 2.58%, 12/15/27 (144A)	94,860
100,000	NMEF Funding LLC, Series 2022-B, Class C, 8.54%, 6/15/29 (144A)	99,677
151,055	Oportun Funding XIV LLC, Series 2021-A, Class C, 3.44%, 3/8/28 (144A)	145,237
250,000(a)	Palmer Square Loan Funding, Ltd., Series 2020-1A, Class B, 7.279% (3 Month USD LIBOR + 190 bps), 2/20/28 (144A)	249,042
250,000(a)	ReadyCap Lending Small Business Loan Trust, Series 2023-3, Class A, 8.32% (SOFR30A + 325 bps), 4/25/48 (144A)	250,000
250,000	Republic Finance Issuance Trust, Series 2021-A, Class A, 2.30%, 12/22/31 (144A)	229,669
100,000	Republic Finance Issuance Trust, Series 2021-A, Class C, 3.53%, 12/22/31 (144A)	85,540
250,000	SCF Equipment Leasing LLC, Series 2021-1A, Class D, 1.93%, 9/20/30 (144A)	221,900
74,253	SpringCastle America Funding LLC, Series 2020-AA, Class A, 1.97%, 9/25/37 (144A)	67,210
325,000(a)	STWD, Ltd., Series 2022-FL3, Class B, 7.018% (SOFR30A + 195 bps), 11/15/38 (144A)	311,922
74,322	Tricolor Auto Securitization Trust, Series 2021-1A, Class D, 1.92%, 5/15/26 (144A)	73,721
120,000	Tricon American Homes Trust, Series 2020-SFR2, Class E1, 2.73%, 11/17/39 (144A)	101,935
132,379	Welk Resorts LLC, Series 2019-AA, Class C, 3.34%, 6/15/38 (144A)	127,023
54,217	Westgate Resorts LLC, Series 2020-1A, Class C, 6.213%, 3/20/34 (144A)	53,473
239,254	Westgate Resorts LLC, Series 2022-1A, Class C, 2.488%, 8/20/36 (144A)	224,410
	Total Asset Backed Securities (Cost $8,815,984)	$8,215,571

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

30Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Collateralized Mortgage Obligations—2.7% of Net Assets
90,537(a)	Bellemeade Re, Ltd., Series 2020-3A, Class M1C, 9.112% (1 Month USD LIBOR + 370 bps), 10/25/30 (144A)	$ 91,535
46,676(a)	Bellemeade Re, Ltd., Series 2020-4A, Class M2B, 9.012% (1 Month USD LIBOR + 360 bps), 6/25/30 (144A)	47,009
425,000(c)	BINOM Securitization Trust, Series 2022-RPL1, Class M2, 3.00%, 2/25/61 (144A)	291,927
100,000(c)	Bunker Hill Loan Depositary Trust, Series 2020-1, Class A3, 3.253%, 2/25/55 (144A)	84,581
100,000(c)	Cascade Funding Mortgage Trust, Series 2021-HB6, Class M3, 3.735%, 6/25/36 (144A)	91,402
450,000(c)	CFMT LLC, Series 2021-HB5, Class M3, 2.91%, 2/25/31 (144A)	413,728
200,000(c)	CFMT LLC, Series 2021-HB7, Class M3, 3.849%, 10/27/31 (144A)	181,599
130,000(c)	CFMT LLC, Series 2022-HB9, Class M3, 3.25%, 9/25/37 (144A)	100,990
500,000(c)	Citigroup Mortgage Loan Trust, Series 2018-RP3, Class M3, 3.25%, 3/25/61 (144A)	404,112
667,685(c)	Citigroup Mortgage Loan Trust, Series 2021-INV2, Class B1W, 2.989%, 5/25/51 (144A)	519,952
6,296(a)	Connecticut Avenue Securities Trust, Series 2019-R07, Class 1M2, 7.283% (SOFR30A + 221 bps), 10/25/39 (144A)	6,306
36,137(a)	Connecticut Avenue Securities Trust, Series 2020-R02, Class 2M2, 7.183% (SOFR30A + 211 bps), 1/25/40 (144A)	36,182
150,000(a)	Connecticut Avenue Securities Trust, Series 2022-R02, Class 2M2, 8.069% (SOFR30A + 300 bps), 1/25/42 (144A)	150,747
82,591(a)	Eagle Re, Ltd., Series 2018-1, Class M1, 6.85% (1 Month USD LIBOR + 170 bps), 11/25/28 (144A)	82,662
6,011(a)	Federal Home Loan Mortgage Corp. REMICs, Series 1671, Class S, 5.832% (SOFR30A + 76 bps), 2/15/24	6,003
207,784	Federal Home Loan Mortgage Corp. REMICs, Series 3816, Class HA, 3.50%, 11/15/25	202,434
13,211(a)	Federal Home Loan Mortgage Corp. REMICs, Series 3868, Class FA, 5.582% (SOFR30A + 51 bps), 5/15/41	12,964
105,912(a)(d)	Federal Home Loan Mortgage Corp. REMICs, Series 4091, Class SH, 1.368% (SOFR30A + 644 bps), 8/15/42	11,616

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2331

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Collateralized Mortgage Obligations—(continued)
84,487(d)	Federal Home Loan Mortgage Corp. REMICs, Series 4999, Class QI, 4.00%, 5/25/50	$ 15,410
112,713(d)	Federal Home Loan Mortgage Corp. REMICs, Series 5067, Class GI, 4.00%, 12/25/50	21,534
14,486(a)	Federal National Mortgage Association REMICs, Series 2006-104, Class GF, 5.503% (SOFR30A + 43 bps), 11/25/36	14,231
19,264(a)	Federal National Mortgage Association REMICs, Series 2006-23, Class FP, 5.483% (SOFR30A + 41 bps), 4/25/36	18,872
7,438(a)	Federal National Mortgage Association REMICs, Series 2007-93, Class FD, 5.733% (SOFR30A + 66 bps), 9/25/37	7,347
47,571(a)	Federal National Mortgage Association REMICs, Series 2011-63, Class FG, 5.633% (SOFR30A + 56 bps), 7/25/41	46,762
72,244(d)	Federal National Mortgage Association REMICs, Series 2020-83, Class EI, 4.00%, 11/25/50	14,482
108,850(a)	Freddie Mac STACR REMIC Trust, Series 2020-DNA3, Class B1, 10.283% (SOFR30A + 521 bps), 6/25/50 (144A)	117,013
124,659(a)	Freddie Mac STACR REMIC Trust, Series 2020-DNA4, Class B1, 11.183% (SOFR30A + 611 bps), 8/25/50 (144A)	139,057
50,241(a)	Freddie Mac STACR REMIC Trust, Series 2020-DNA5, Class M2, 7.869% (SOFR30A + 280 bps), 10/25/50 (144A)	50,964
485,000(a)	Freddie Mac STACR REMIC Trust, Series 2021-HQA3, Class B1, 8.419% (SOFR30A + 335 bps), 9/25/41 (144A)	483,191
400,000(a)	Freddie Mac STACR REMIC Trust, Series 2021-HQA3, Class M2, 7.169% (SOFR30A + 210 bps), 9/25/41 (144A)	392,000
309,255(d)	Government National Mortgage Association, Series 2019-159, Class CI, 3.50%, 12/20/49	54,231
260,293(a)(d)	Government National Mortgage Association, Series 2020-9, Class SA, 0.000% (1 Month Term SOFR + 324 bps), 1/20/50	4,278
160,000(c)	GS Mortgage-Backed Securities Corp. Trust, Series 2022-PJ4, Class A33, 3.00%, 9/25/52 (144A)	111,496
50,386(c)	GS Mortgage-Backed Securities Trust, Series 2020-NQM1, Class A3, 2.352%, 9/27/60 (144A)	46,581
301,504(c)	GS Mortgage-Backed Securities Trust, Series 2022-PJ1, Class A4, 2.50%, 5/28/52 (144A)	230,615

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

32Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Collateralized Mortgage Obligations—(continued)
68,968(a)	Home Re, Ltd., Series 2019-1, Class M1, 7.062% (1 Month USD LIBOR + 165 bps), 5/25/29 (144A)	$ 68,961
107,211(a)	Home Re, Ltd., Series 2020-1, Class M2, 10.662% (1 Month USD LIBOR + 525 bps), 10/25/30 (144A)	108,592
100,000(c)	Homeward Opportunities Fund I Trust, Series 2020-2, Class A3, 3.196%, 5/25/65 (144A)	91,913
100,000(c)	Imperial Fund Mortgage Trust, Series 2021-NQM2, Class B1, 3.295%, 9/25/56 (144A)	57,514
100,000(c)	Imperial Fund Mortgage Trust, Series 2021-NQM2, Class M1, 2.489%, 9/25/56 (144A)	58,986
349,709	IMS Ecuadorian Mortgage Trust, Series 2021-1, Class GA, 3.40%, 8/18/43 (144A)	318,235
125,167(c)	JP Morgan Mortgage Trust, Series 2021-13, Class B1, 3.142%, 4/25/52 (144A)	98,076
284,781(c)	JP Morgan Mortgage Trust, Series 2021-7, Class B2, 2.80%, 11/25/51 (144A)	204,667
123,221(c)	JP Morgan Mortgage Trust, Series 2021-INV1, Class B1, 2.983%, 10/25/51 (144A)	96,080
800,000(c)	JP Morgan Mortgage Trust, Series 2022-2, Class A5A, 2.50%, 8/25/52 (144A)	514,337
210,000(c)	JP Morgan Mortgage Trust, Series 2022-4, Class A5, 3.00%, 10/25/52 (144A)	145,921
670,964(c)	JP Morgan Mortgage Trust, Series 2022-8, Class B2, 4.674%, 1/25/53 (144A)	575,700
250,000(c)	JP Morgan Mortgage Trust, Series 2022-LTV1, Class M1, 3.524%, 7/25/52 (144A)	152,080
342,893(c)	Mello Mortgage Capital Acceptance, Series 2021-INV2, Class A15, 2.50%, 8/25/51 (144A)	265,274
300,000(c)	Mello Mortgage Capital Acceptance, Series 2021-INV2, Class A5, 2.50%, 8/25/51 (144A)	194,109
50,203(c)	MFA Trust, Series 2020-NQM1, Class A3, 2.30%, 8/25/49 (144A)	44,794
300,000(c)	Mill City Mortgage Loan Trust, Series 2019-GS2, Class M3, 3.25%, 8/25/59 (144A)	235,168
35,180(c)	New Residential Mortgage Loan Trust, Series 2019-NQM4, Class A1, 2.492%, 9/25/59 (144A)	32,480
113,468(a)	Oaktown Re V, Ltd., Series 2020-2A, Class M2, 10.433% (SOFR30A + 536 bps), 10/25/30 (144A)	115,708
565,258(c)	PRMI Securitization Trust, Series 2021-1, Class B1, 2.479%, 4/25/51 (144A)	405,106
272,769(c)	Provident Funding Mortgage Trust, Series 2021-2, Class A9, 2.25%, 4/25/51 (144A)	208,978
150,000(a)(e)	Radnor Re, Ltd., Series 2023-1, Class M1A, 7.767% (SOFR30A + 270 bps), 7/25/33 (144A)	150,000

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2333

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Collateralized Mortgage Obligations—(continued)
317,083(c)	RCKT Mortgage Trust, Series 2021-3, Class A25, 2.50%, 7/25/51 (144A)	$ 245,702
277,701(c)	RCKT Mortgage Trust, Series 2021-4, Class B1A, 3.007%, 9/25/51 (144A)	216,435
385,000(c)	RCKT Mortgage Trust, Series 2022-3, Class A17, 3.00%, 5/25/52 (144A)	264,459
37,733(c)	RMF Proprietary Issuance Trust, Series 2019-1, Class A, 2.75%, 10/25/63 (144A)	30,347
329,946(c)	RMF Proprietary Issuance Trust, Series 2021-2, Class A, 2.125%, 9/25/61 (144A)	234,224
150,000(c)	Sequoia Mortgage Trust, Series 2022-1, Class A7, 2.50%, 2/25/52 (144A)	96,531
311,568(a)	STACR Trust, Series 2018-HRP2, Class M3, 7.583% (SOFR30A + 251 bps), 2/25/47 (144A)	316,773
400,000(c)	UWM Mortgage Trust, Series 2021-INV1, Class A5, 2.50%, 8/25/51 (144A)	261,076
675,000(c)	UWM Mortgage Trust, Series 2021-INV2, Class A5, 2.50%, 9/25/51 (144A)	440,538
64,921(c)	Visio Trust, Series 2019-2, Class A1, 2.722%, 11/25/54 (144A)	61,228
371,067(c)	Wells Fargo Mortgage Backed Securities Trust, Series 2020-5, Class B2, 2.916%, 9/25/50 (144A)	288,257
100,000(c)	Wells Fargo Mortgage Backed Securities Trust, Series 2022-2, Class A5, 3.00%, 12/25/51 (144A)	69,403
335,000(c)	Wells Fargo Mortgage Backed Securities Trust, Series 2022-2, Class A6, 2.50%, 12/25/51 (144A)	214,709
	Total Collateralized Mortgage Obligations (Cost $13,237,845)	$11,386,174


	Commercial Mortgage-Backed Securities—1.6% of Net Assets
300,000	Benchmark Mortgage Trust, Series 2018-B8, Class A4, 3.963%, 1/15/52	$ 283,709
200,000(c)	Benchmark Mortgage Trust, Series 2022-B34, Class AM, 3.832%, 4/15/55	169,030
160,081(a)	CHC Commercial Mortgage Trust, Series 2019-CHC, Class D, 7.386% (1 Month Term SOFR + 216 bps), 6/15/34 (144A)	155,235
200,101(a)	CHC Commercial Mortgage Trust, Series 2019-CHC, Class E, 7.686% (1 Month Term SOFR + 246 bps), 6/15/34 (144A)	188,104
207,730	Citigroup Commercial Mortgage Trust, Series 2018-C5, Class A3, 3.963%, 6/10/51	192,091
8,397,151(c)(d)	COMM Mortgage Trust, Series 2014-CR18, Class XA, 0.916%, 7/15/47	41,431

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

34Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Commercial Mortgage-Backed Securities—(continued)
847	Credit Suisse First Boston Mortgage Securities Corp., Series 2005-C2, Class AMFX, 4.877%, 4/15/37	$ 830
250,000(c)	CSAIL Commercial Mortgage Trust, Series 2015-C4, Class AS, 4.174%, 11/15/48	233,959
14,309(a)	Freddie Mac Multifamily Structured Credit Risk, Series 2021-MN1, Class M1, 7.069% (SOFR30A + 200 bps), 1/25/51 (144A)	13,746
550,000(a)	Freddie Mac Multifamily Structured Credit Risk, Series 2021-MN3, Class M2, 9.069% (SOFR30A + 400 bps), 11/25/51 (144A)	516,222
300,000	Freddie Mac Multifamily Structured Pass Through Certificates, Series K729, Class A2, 3.136%, 10/25/24	291,532
100,000(c)	FREMF Mortgage Trust, Series 2017-KW03, Class B, 4.077%, 7/25/27 (144A)	91,142
109,745(a)	FREMF Mortgage Trust, Series 2019-KF64, Class B, 7.518% (1 Month USD LIBOR + 230 bps), 6/25/26 (144A)	104,551
207,604(a)	FREMF Mortgage Trust, Series 2019-KF66, Class B, 7.618% (1 Month USD LIBOR + 240 bps), 7/25/29 (144A)	190,397
250,000(c)	FREMF Trust, Series 2018-KW04, Class B, 3.925%, 9/25/28 (144A)	213,494
829,431(c)(d)	Government National Mortgage Association, Series 2017-21, Class IO, 0.633%, 10/16/58	29,651
400,000(a)	GS Mortgage Securities Corportation Trust, Series 2021-IP, Class D, 7.436% (1 Month Term SOFR + 221 bps), 10/15/36 (144A)	361,570
375,000	JP Morgan Chase Commercial Mortgage Securities Trust, Series 2018-WPT, Class AFX, 4.248%, 7/5/33 (144A)	336,367
250,000	JPMDB Commercial Mortgage Securities Trust, Series 2018-C8, Class A4, 4.211%, 6/15/51	231,620
2,450,000(c)(d)	JPMDB Commercial Mortgage Securities Trust, Series 2018-C8, Class XB, 0.125%, 6/15/51	13,284
250,000	Key Commercial Mortgage Securities Trust, Series 2019-S2, Class A3, 3.469%, 6/15/52 (144A)	223,949
398,090(a)	Med Trust, Series 2021-MDLN, Class E, 8.486% (1 Month Term SOFR + 326 bps), 11/15/38 (144A)	376,149
250,000(a)	MF1 Multifamily Housing Mortgage Loan Trust, Series 2021-FL5, Class D, 7.836% (1 Month Term SOFR + 261 bps), 7/15/36 (144A)	237,330
300,000(c)	Morgan Stanley Capital I Trust, Series 2018-MP, Class A, 4.276%, 7/11/40 (144A)	244,619
50,000	Palisades Center Trust, Series 2016-PLSD, Class A, 2.713%, 4/13/33 (144A)	28,500

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2335

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Commercial Mortgage-Backed Securities—(continued)
500,000(a)	Ready Capital Mortgage Financing LLC, Series 2021-FL7, Class D, 8.362% (1 Month Term SOFR + 306 bps), 11/25/36 (144A)	$ 468,055
475,000	SLG Office Trust, Series 2021-OVA, Class E, 2.851%, 7/15/41 (144A)	337,637
125,000(c)	Soho Trust, Series 2021-SOHO, Class A, 2.697%, 8/10/38 (144A)	87,004
325,000(a)	Taubman Centers Commercial Mortgage Trust, Series 2022-DPM, Class B, 8.154% (1 Month Term SOFR + 293 bps), 5/15/37 (144A)	315,251
348,734(a)	TTAN, Series 2021-MHC, Class B, 6.436% (1 Month Term SOFR + 121 bps), 3/15/38 (144A)	342,611
250,000(c)	UBS Commercial Mortgage Trust, Series 2018-C9, Class C, 4.948%, 3/15/51	180,585
1,007,650(c)(d)	Wells Fargo Commercial Mortgage Trust, Series 2015-NXS3, Class XA, 0.874%, 9/15/57	15,251
2,311,983(c)(d)	Wells Fargo Commercial Mortgage Trust, Series 2016-LC24, Class XA, 1.601%, 10/15/49	88,172
	Total Commercial Mortgage-Backed Securities (Cost $7,596,575)	$6,603,078


	Convertible Corporate Bonds — 1.7% of Net Assets
	REITs — 1.7%
4,484,000	PennyMac Corp., 5.50%, 3/15/26	$ 3,945,920
3,227,000	Redwood Trust, Inc., 7.75%, 6/15/27	2,930,520
	Total REITs	$6,876,440


	Total Convertible Corporate Bonds (Cost $7,043,529)	$6,876,440


	Corporate Bonds — 10.5% of Net Assets
	Aerospace & Defense — 0.1%
355,000	RTX Corp., 3.20%, 3/15/24	$ 349,684
	Total Aerospace & Defense	$349,684


	Airlines — 0.0%†
118,296	Air Canada 2017-1 Class AA Pass Through Trust, 3.30%, 7/15/31 (144A)	$ 103,694
60,000	Delta Air Lines, Inc./SkyMiles IP, Ltd., 4.75%, 10/20/28 (144A)	58,071
	Total Airlines	$161,765


	Auto Manufacturers — 0.2%
165,000	General Motors Financial Co., Inc., 3.10%, 1/12/32	$ 134,850

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

36Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Auto Manufacturers — (continued)
410,000(a)	General Motors Financial Co., Inc., 5.958% (SOFR + 76 bps), 3/8/24	$ 409,896
285,000	Hyundai Capital America, 5.80%, 4/1/30 (144A)	286,462
	Total Auto Manufacturers	$831,208


	Banks — 3.8%
400,000(c)	ABN AMRO Bank NV, 2.47% (1 Year CMT Index + 110 bps), 12/13/29 (144A)	$ 339,147
200,000	ABN AMRO Bank NV, 4.80%, 4/18/26 (144A)	192,478
200,000(c)	AIB Group Plc, 4.263% (3 Month USD LIBOR + 187 bps), 4/10/25 (144A)	196,376
200,000	Banco Santander Chile, 2.70%, 1/10/25 (144A)	191,240
200,000(c)	Banco Santander SA, 1.722% (1 Year CMT Index + 90 bps), 9/14/27	175,584
600,000(c)	Banco Santander SA, 3.225% (1 Year CMT Index + 160 bps), 11/22/32	478,097
335,000(c)	Bank of America Corp., 2.572% (SOFR + 121 bps), 10/20/32	271,881
150,000(c)	Bank of New York Mellon Corp., 5.834% (SOFR + 207 bps), 10/25/33	155,344
565,000(c)	Bank of Nova Scotia, 4.588% (5 Year CMT Index + 205 bps), 5/4/37	488,595
445,000(c)	Barclays Plc, 5.746% (1 Year CMT Index + 300 bps), 8/9/33	435,711
2,235,000(c)(f)	Barclays Plc, 8.00% (5 Year CMT Index + 543 bps)	2,078,550
225,000(c)	BNP Paribas SA, 2.159% (SOFR + 122 bps), 9/15/29 (144A)	188,869
350,000(c)	BPCE SA, 3.116% (SOFR + 173 bps), 10/19/32 (144A)	272,420
250,000(c)	BPCE SA, 3.648% (5 Year CMT Index + 190 bps), 1/14/37 (144A)	199,778
220,000(c)	Citigroup, Inc., 2.52% (SOFR + 118 bps), 11/3/32	177,064
205,000(c)	Citigroup, Inc., 4.91% (SOFR + 209 bps), 5/24/33	198,240
95,000(c)	Citigroup, Inc., 6.174% (SOFR + 266 bps), 5/25/34	96,503
375,000(c)	Comerica Bank, 5.332% (SOFR + 261 bps), 8/25/33	325,997
210,000(c)	Goldman Sachs Group, Inc., 2.65% (SOFR + 126 bps), 10/21/32	170,533
195,000(c)	Goldman Sachs Group, Inc., 3.272% (3 Month Term SOFR + 146 bps), 9/29/25	189,125
140,000(c)	Goldman Sachs Group, Inc., 4.223% (3 Month Term SOFR + 156 bps), 5/1/29	132,765
305,000(c)	HSBC Holdings Plc, 2.206% (SOFR + 129 bps), 8/17/29	256,668
335,000(c)	HSBC Holdings Plc, 2.871% (SOFR + 141 bps), 11/22/32	270,880
200,000(c)	HSBC Holdings Plc, 6.161% (SOFR + 197 bps), 3/9/29	202,646
200,000(c)	ING Groep NV, 4.252% (SOFR + 207 bps), 3/28/33	182,645

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2337

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Banks — (continued)
585,000(c)(f)	ING Groep NV, 4.25% (5 Year CMT Index + 286 bps)	$ 409,375
250,000(c)	Intesa Sanpaolo S.p.A., 7.778% (1 Year CMT Index + 390 bps), 6/20/54 (144A)	252,915
275,000(c)	JPMorgan Chase & Co., 2.545% (SOFR + 118 bps), 11/8/32	225,952
90,000(c)	JPMorgan Chase & Co., 4.586% (SOFR + 180 bps), 4/26/33	85,874
285,000(c)	Lloyds Banking Group Plc, 4.976% (1 Year CMT Index + 230 bps), 8/11/33	268,151
260,000(c)	Lloyds Banking Group Plc, 7.953% (1 Year CMT Index + 375 bps), 11/15/33	283,496
205,000(c)(f)	Lloyds Banking Group Plc, 8.00% (5 Year CMT Index + 391 bps)	191,880
300,000(c)	Macquarie Group, Ltd., 2.691% (SOFR + 144 bps), 6/23/32 (144A)	236,681
175,000(c)	Macquarie Group, Ltd., 2.871% (SOFR + 153 bps), 1/14/33 (144A)	138,873
200,000(c)	Mitsubishi UFJ Financial Group, Inc., 2.494% (1 Year CMT Index + 97 bps), 10/13/32	160,907
290,000(c)	Morgan Stanley, 5.297% (SOFR + 262 bps), 4/20/37	275,207
65,000(c)	Morgan Stanley, 5.948% (5 Year CMT Index + 243 bps), 1/19/38	64,661
585,000(c)(f)	Nordea Bank Abp, 3.75% (5 Year CMT Index + 260 bps) (144A)	448,369
195,000(c)	Santander Holdings USA, Inc., 2.49% (SOFR + 125 bps), 1/6/28	169,459
200,000(c)	Societe Generale SA, 4.027% (1 Year CMT Index + 190 bps), 1/21/43 (144A)	137,213
200,000(c)(f)	Societe Generale SA, 5.375% (5 Year CMT Index + 451 bps) (144A)	159,520
245,000(c)	Societe Generale SA, 6.221% (1 Year CMT Index + 320 bps), 6/15/33 (144A)	232,598
330,000(c)	Standard Chartered Plc, 3.603% (1 Year CMT Index + 190 bps), 1/12/33 (144A)	266,474
200,000(c)	Standard Chartered Plc, 6.296% (1 Year CMT Index + 258 bps), 7/6/34 (144A)	203,771
53,000(c)	Truist Financial Corp., 4.916% (SOFR + 224 bps), 7/28/33	48,529
385,000(c)	UBS Group AG, 2.746% (1 Year CMT Index + 110 bps), 2/11/33 (144A)	305,133
2,500,000(c)(f)	UBS Group AG, 4.875% (5 Year CMT Index + 340 bps) (144A)	2,078,125
200,000(c)	UBS Group AG, 4.988% (1 Year CMT Index + 240 bps), 8/5/33 (144A)	188,625

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

38Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Banks — (continued)
350,000(c)	UniCredit S.p.A., 2.569% (1 Year CMT Index + 230 bps), 9/22/26 (144A)	$ 320,349
230,000(c)	UniCredit S.p.A., 5.459% (5 Year CMT Index + 475 bps), 6/30/35 (144A)	200,743
200,000(c)	UniCredit S.p.A., 7.296% (5 Year USD Swap Rate + 491 bps), 4/2/34 (144A)	194,082
530,000(c)	US Bancorp, 2.491% (5 Year CMT Index + 95 bps), 11/3/36	399,015
	Total Banks	$15,813,113


	Biotechnology — 0.0%†
165,000	Amgen, Inc., 5.25%, 3/2/33	$ 164,675
	Total Biotechnology	$164,675


	Building Materials — 0.0%†
140,000	Fortune Brands Innovations, Inc., 4.50%, 3/25/52	$ 110,000
	Total Building Materials	$110,000


	Chemicals — 0.3%
236,000	Albemarle Corp., 5.05%, 6/1/32	$ 225,729
329,000	Albemarle Corp., 5.65%, 6/1/52	309,060
205,000	Celanese US Holdings LLC, 6.379%, 7/15/32	207,369
385,000	OCI NV, 6.70%, 3/16/33 (144A)	380,136
	Total Chemicals	$1,122,294


	Commercial Services — 0.2%
35,000	Allied Universal Holdco LLC/Allied Universal Finance Corp., 6.625%, 7/15/26 (144A)	$ 33,422
200,000	Ashtead Capital, Inc., 5.50%, 8/11/32 (144A)	193,764
110,000	Element Fleet Management Corp., 1.60%, 4/6/24 (144A)	106,477
195,000	Garda World Security Corp., 4.625%, 2/15/27 (144A)	180,116
115,000	Prime Security Services Borrower LLC/Prime Finance, Inc., 6.25%, 1/15/28 (144A)	108,264
	Total Commercial Services	$622,043


	Cosmetics/Personal Care — 0.1%
210,000	Estee Lauder Cos., Inc., 5.15%, 5/15/53	$ 210,705
	Total Cosmetics/Personal Care	$210,705


	Diversified Financial Services — 1.1%
205,000	AerCap Ireland Capital DAC/AerCap Global Aviation Trust, 3.30%, 1/30/32	$ 168,206
595,000	Air Lease Corp., 2.875%, 1/15/32	479,229
410,000	Ally Financial, Inc., 4.75%, 6/9/27	386,411
45,000(c)	Ally Financial, Inc., 6.992% (SOFR + 326 bps), 6/13/29	45,333

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2339

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Diversified Financial Services — (continued)
55,000	Ally Financial, Inc., 8.00%, 11/1/31	$ 58,355
245,000	Ameriprise Financial, Inc., 5.15%, 5/15/33	243,047
18,000	Avolon Holdings Funding, Ltd., 3.95%, 7/1/24 (144A)	17,512
570,000	Avolon Holdings Funding, Ltd., 6.375%, 5/4/28 (144A)	568,113
200,000	B3 SA - Brasil Bolsa Balcao, 4.125%, 9/20/31 (144A)	171,100
206,000	Bread Financial Holdings, Inc., 7.00%, 1/15/26 (144A)	198,959
22,000(c)	Capital One Financial Corp., 2.359% (SOFR + 134 bps), 7/29/32	15,962
150,000	Capital One Financial Corp., 3.75%, 4/24/24	147,466
110,000	Capital One Financial Corp., 4.25%, 4/30/25	106,693
35,000(c)	Capital One Financial Corp., 5.247% (SOFR + 260 bps), 7/26/30	33,578
80,000(c)	Capital One Financial Corp., 5.268% (SOFR + 237 bps), 5/10/33	76,207
95,000(c)	Capital One Financial Corp., 5.817% (SOFR + 260 bps), 2/1/34	92,318
140,000(c)	Capital One Financial Corp., 6.377% (SOFR + 286 bps), 6/8/34	141,336
220,000(c)	Charles Schwab Corp., 5.853% (SOFR + 250 bps), 5/19/34	226,707
445,000	Nomura Holdings, Inc., 2.999%, 1/22/32	358,021
225,000	Nomura Holdings, Inc., 5.605%, 7/6/29	222,330
120,000	OneMain Finance Corp., 3.50%, 1/15/27	103,761
305,000	OneMain Finance Corp., 4.00%, 9/15/30	239,613
143,000	Raymond James Financial, Inc., 3.75%, 4/1/51	107,393
163,000	United Wholesale Mortgage LLC, 5.50%, 4/15/29 (144A)	143,298
	Total Diversified Financial Services	$4,350,948


	Electric — 0.4%
195,000(c)	Algonquin Power & Utilities Corp., 4.75% (5 Year CMT Index + 325 bps), 1/18/82	$ 157,355
125,000	American Electric Power Co., Inc., 4.30%, 12/1/28	119,878
220,000	Consolidated Edison Co. of New York, Inc., 4.625%, 12/1/54	191,702
76,000(g)	Dominion Energy, Inc., 3.071%, 8/15/24	73,795
250,000	Duke Energy Carolinas LLC, 3.95%, 3/15/48	200,992
75,000	Entergy Louisiana LLC, 4.75%, 9/15/52	67,915
121,000	New York State Electric & Gas Corp., 3.30%, 9/15/49 (144A)	82,001
185,000	NextEra Energy Capital Holdings, Inc., 6.051%, 3/1/25	186,342
75,000	Niagara Mohawk Power Corp., 5.783%, 9/16/52 (144A)	75,707
205,000	Puget Energy, Inc., 2.379%, 6/15/28	176,820

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

40Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Electric — (continued)
142,000	Puget Energy, Inc., 4.10%, 6/15/30	$ 128,485
120,000	Puget Energy, Inc., 4.224%, 3/15/32	107,559
200,000	Virginia Electric and Power Co., 4.45%, 2/15/44	171,959
	Total Electric	$1,740,510


	Energy-Alternate Sources — 0.0%†
35,226	Alta Wind Holdings LLC, 7.00%, 6/30/35 (144A)	$ 32,054
	Total Energy-Alternate Sources	$32,054


	Food — 0.1%
200,000	Minerva Luxembourg SA, 4.375%, 3/18/31 (144A)	$ 163,239
215,000	Smithfield Foods, Inc., 2.625%, 9/13/31 (144A)	158,393
155,000	Smithfield Foods, Inc., 3.00%, 10/15/30 (144A)	123,608
4,000	Smithfield Foods, Inc., 5.20%, 4/1/29 (144A)	3,702
	Total Food	$448,942


	Gas — 0.2%
325,000	Boston Gas Co., 3.15%, 8/1/27 (144A)	$ 296,424
375,000	KeySpan Gas East Corp., 5.994%, 3/6/33 (144A)	375,911
120,000	NiSource, Inc., 5.40%, 6/30/33	120,971
	Total Gas	$793,306


	Hand & Machine Tools — 0.0%†
125,000	Regal Rexnord Corp., 6.30%, 2/15/30 (144A)	$ 124,795
	Total Hand & Machine Tools	$124,795


	Healthcare-Products — 0.1%
48,000	Edwards Lifesciences Corp., 4.30%, 6/15/28	$ 46,537
244,000	Smith & Nephew Plc, 2.032%, 10/14/30	196,672
	Total Healthcare-Products	$243,209


	Healthcare-Services — 0.1%
135,000	Elevance Health, Inc., 4.55%, 5/15/52	$ 119,392
65,000	Elevance Health, Inc., 6.10%, 10/15/52	70,754
250,000	Fresenius Medical Care US Finance III, Inc., 2.375%, 2/16/31 (144A)	191,431
	Total Healthcare-Services	$381,577


	Insurance — 0.7%
185,000	Brown & Brown, Inc., 4.20%, 3/17/32	$ 167,267
435,000	CNO Global Funding, 2.65%, 1/6/29 (144A)	370,065
50,000(c)	Farmers Exchange Capital III, 5.454% (3 Month USD LIBOR + 345 bps), 10/15/54 (144A)	43,629
385,000(c)	Farmers Insurance Exchange, 4.747% (3 Month USD LIBOR + 323 bps), 11/1/57 (144A)	299,891

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2341

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Insurance — (continued)
875,000	Liberty Mutual Insurance Co., 7.697%, 10/15/97 (144A)	$ 957,198
160,000	Metropolitan Life Global Funding I, 5.15%, 3/28/33 (144A)	158,784
270,000(c)	Nippon Life Insurance Co., 2.75% (5 Year CMT Index + 265 bps), 1/21/51 (144A)	221,619
200,000(c)	Nippon Life Insurance Co., 2.90% (5 Year CMT Index + 260 bps), 9/16/51 (144A)	163,874
79,000	Primerica, Inc., 2.80%, 11/19/31	65,526
305,000	Prudential Financial, Inc., 3.00%, 3/10/40	230,615
163,000	Prudential Financial, Inc., 3.878%, 3/27/28	156,655
110,000	Teachers Insurance & Annuity Association of America, 4.27%, 5/15/47 (144A)	90,387
110,000	Teachers Insurance & Annuity Association of America, 4.90%, 9/15/44 (144A)	99,898
20,000	Teachers Insurance & Annuity Association of America, 6.85%, 12/16/39 (144A)	22,185
40,000	Willis North America, Inc., 2.95%, 9/15/29	34,760
	Total Insurance	$3,082,353


	Iron & Steel — 0.0%†
67,000	Commercial Metals Co., 4.375%, 3/15/32	$ 58,116
	Total Iron & Steel	$58,116


	Lodging — 0.1%
405,000	Marriott International, Inc., 4.90%, 4/15/29	$ 397,209
	Total Lodging	$397,209


	Machinery-Diversified — 0.1%
500,000	CNH Industrial Capital LLC, 1.875%, 1/15/26	$ 458,223
	Total Machinery-Diversified	$458,223


	Media — 0.1%
125,000	CCO Holdings LLC/CCO Holdings Capital Corp., 4.50%, 6/1/33 (144A)	$ 98,912
70,000	CCO Holdings LLC/CCO Holdings Capital Corp., 7.375%, 3/1/31 (144A)	69,601
215,000	Charter Communications Operating LLC/Charter Communications Operating Capital, 4.40%, 4/1/33	189,298
	Total Media	$357,811


	Mining — 0.3%
290,000	AngloGold Ashanti Holdings Plc, 3.75%, 10/1/30	$ 250,407
250,000	Corp. Nacional del Cobre de Chile, 5.625%, 10/18/43 (144A)	247,279

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

42Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Mining — (continued)
270,000	First Quantum Minerals, Ltd., 8.625%, 6/1/31 (144A)	$ 276,412
275,000	Rio Tinto Finance USA Plc, 5.125%, 3/9/53	275,754
	Total Mining	$1,049,852


	Multi-National — 0.1%
370,000	Banque Ouest Africaine de Developpement, 4.70%, 10/22/31 (144A)	$ 309,431
	Total Multi-National	$309,431


	Oil & Gas — 0.3%
600,000	Aker BP ASA, 3.10%, 7/15/31 (144A)	$ 497,604
400,000	Phillips 66 Co., 3.75%, 3/1/28	375,394
250,000	Sinopec Group Overseas Development 2014, Ltd., 4.375%, 4/10/24 (144A)	247,762
162,000	Valero Energy Corp., 6.625%, 6/15/37	174,274
	Total Oil & Gas	$1,295,034


	Pharmaceuticals — 0.2%
618,000	AbbVie, Inc., 3.20%, 11/21/29	$ 559,794
117,000	AbbVie, Inc., 4.05%, 11/21/39	101,869
40,000	CVS Health Corp., 5.25%, 1/30/31	40,003
250,000	CVS Health Corp., 5.25%, 2/21/33	248,710
	Total Pharmaceuticals	$950,376


	Pipelines — 0.4%
125,000	Crestwood Midstream Partners LP/Crestwood Midstream Finance Corp., 7.375%, 2/1/31 (144A)	$ 124,683
555,000	Kinder Morgan, Inc., 5.45%, 8/1/52	512,476
260,000	MPLX LP, 4.95%, 3/14/52	220,842
180,000	NGPL PipeCo LLC, 3.25%, 7/15/31 (144A)	148,250
65,000	Venture Global LNG, Inc., 8.125%, 6/1/28 (144A)	66,065
120,000	Venture Global LNG, Inc., 8.375%, 6/1/31 (144A)	121,766
205,000	Williams Cos., Inc., 5.75%, 6/24/44	200,671
242,000	Williams Cos., Inc., 7.75%, 6/15/31	267,273
	Total Pipelines	$1,662,026


	REITs — 0.4%
489,000	HAT Holdings I LLC/HAT Holdings II LLC , 3.375%, 6/15/26 (144A)	$ 441,676
19,000	Highwoods Realty LP, 2.60%, 2/1/31	13,991
18,000	Highwoods Realty LP, 3.05%, 2/15/30	14,069
490,000	Simon Property Group LP , 5.50%, 3/8/33	489,521
480,000	Sun Communities Operating LP , 5.70%, 1/15/33	471,793

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2343

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	REITs — (continued)
205,000	UDR, Inc., 1.90%, 3/15/33	$ 151,528
140,000	UDR, Inc., 4.40%, 1/26/29	131,741
	Total REITs	$1,714,319


	Retail — 0.4%
240,000	7-Eleven, Inc., 2.80%, 2/10/51 (144A)	$ 151,017
50,000	AutoNation, Inc., 1.95%, 8/1/28	41,273
50,000	AutoNation, Inc., 2.40%, 8/1/31	38,415
140,000	AutoNation, Inc., 3.85%, 3/1/32	118,724
250,000	AutoNation, Inc., 4.75%, 6/1/30	235,253
565,000	Best Buy Co., Inc., 1.95%, 10/1/30	456,882
335,000	Dollar Tree, Inc., 2.65%, 12/1/31	274,812
280,000	Lowe's Cos., Inc., 3.75%, 4/1/32	253,894
90,000	Tractor Supply Co., 5.25%, 5/15/33	88,980
	Total Retail	$1,659,250


	Semiconductors — 0.2%
391,000	Broadcom, Inc., 3.187%, 11/15/36 (144A)	$ 295,653
125,000	Broadcom, Inc., 4.15%, 4/15/32 (144A)	113,023
60,000	Broadcom, Inc., 4.30%, 11/15/32	54,735
200,000	Foundry JV Holdco LLC, 5.875%, 1/25/34 (144A)	197,996
269,000	Skyworks Solutions, Inc., 3.00%, 6/1/31	223,082
	Total Semiconductors	$884,489


	Software — 0.1%
379,000	Autodesk, Inc., 2.40%, 12/15/31	$ 310,738
175,000	Infor, Inc., 1.75%, 7/15/25 (144A)	160,595
	Total Software	$471,333


	Telecommunications — 0.2%
215,000	Motorola Solutions, Inc., 2.30%, 11/15/30	$ 172,935
230,000	Motorola Solutions, Inc., 5.60%, 6/1/32	228,274
350,000	T-Mobile USA, Inc., 2.55%, 2/15/31	290,848
170,000	T-Mobile USA, Inc., 5.05%, 7/15/33	166,371
230,000	Verizon Communications, Inc., 3.55%, 3/22/51	166,576
	Total Telecommunications	$1,025,004


	Transportation — 0.1%
250,000	FedEx Corp., 4.55%, 4/1/46	$ 215,687
	Total Transportation	$215,687


	Trucking & Leasing — 0.1%
98,000	Penske Truck Leasing Co. LP/PTL Finance Corp., 4.40%, 7/1/27 (144A)	$ 92,897

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

44Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Trucking & Leasing — (continued)
255,000	Penske Truck Leasing Co. LP/PTL Finance Corp., 5.55%, 5/1/28 (144A)	$ 251,053
35,000(e)	Penske Truck Leasing Co. LP/PTL Finance Corp., 6.05%, 8/1/28 (144A)	35,103
40,000	Penske Truck Leasing Co. LP/PTL Finance Corp., 6.20%, 6/15/30 (144A)	40,394
	Total Trucking & Leasing	$419,447


	Total Corporate Bonds (Cost $48,090,478)	$43,510,788

Shares
	Convertible Preferred Stock — 0.2% of Net Assets
	Banks — 0.2%
577(f)	Wells Fargo & Co., 7.50%	$ 680,277
	Total Banks	$680,277


	Total Convertible Preferred Stock (Cost $824,732)	$680,277

Principal Amount USD ($)
	Municipal Bonds — 0.1% of Net Assets(h)
	Massachusetts — 0.0%†
100,000	Massachusetts Development Finance Agency, Federally Taxable, Series B, 4.844%, 9/1/43	$ 94,056
	Total Massachusetts	$ 94,056


	Missouri — 0.0%†
100,000	Health & Educational Facilities Authority of the State of Missouri, Washington University, Series A, 3.685%, 2/15/47	$ 78,912
	Total Missouri	$ 78,912


	Texas — 0.1%
100,000(i)	Central Texas Regional Mobility Authority, 1/1/25	$ 94,503
	Total Texas	$ 94,503


	Total Municipal Bonds (Cost $292,578)	$ 267,471

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2345

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Shares		Value
	Preferred Stock — 0.4% of Net Assets
	Automobiles — 0.4%
15,107(b)	Porsche AG (144A)	$ 1,847,048
	Total Automobiles	$1,847,048


	Total Preferred Stock (Cost $1,237,220)	$1,847,048

Principal Amount USD ($)
	Insurance-Linked Securities — 0.1% of Net Assets#
	Event Linked Bonds — 0.1%
	Multiperil – U.S. — 0.1%
250,000(a)	Easton Re Pte, 9.916%, (3 Month U.S. Treasury Bill + 453 bps), 1/8/24 (144A)	$ 248,100
	Windstorm – U.S. — 0.0%†
250,000(a)	Bonanza Re, 10.279%, (3 Month U.S. Treasury Bill + 487 bps), 12/23/24 (144A)	$ 224,800
	Total Event Linked Bonds	$ 472,900

Face Amount USD ($)
	Reinsurance Sidecars — 0.0%†
	Multiperil – Worldwide — 0.0%†
100,000(j) +	Sector Re V, 3/1/24 (144A)	$ 50,740
	Total Reinsurance Sidecars	$50,740


	Total Insurance-Linked Securities (Cost $568,166)	$523,640

Principal Amount USD ($)
	Foreign Government Bond — 0.0%† of Net Assets
	Philippines — 0.0%†
200,000	Philippine Government International Bond, 5.000%, 1/13/37	$ 196,744
	Total Philippines	$196,744


	Total Foreign Government Bond (Cost $260,250)	$196,744

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

46Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	U.S. Government and Agency Obligations — 13.4% of Net Assets
358,673	Federal Home Loan Mortgage Corp., 1.500%, 12/1/41	$ 288,972
92,478	Federal Home Loan Mortgage Corp., 1.500%, 1/1/42	74,468
91,079	Federal Home Loan Mortgage Corp., 1.500%, 1/1/42	73,341
452,589	Federal Home Loan Mortgage Corp., 1.500%, 1/1/42	364,448
181,104	Federal Home Loan Mortgage Corp., 1.500%, 2/1/42	145,834
272,303	Federal Home Loan Mortgage Corp., 1.500%, 2/1/42	219,159
95,132	Federal Home Loan Mortgage Corp., 2.000%, 3/1/52	77,130
732,162	Federal Home Loan Mortgage Corp., 2.500%, 5/1/51	619,484
186,571	Federal Home Loan Mortgage Corp., 2.500%, 4/1/52	157,350
75,843	Federal Home Loan Mortgage Corp., 3.000%, 6/1/46	67,859
18,548	Federal Home Loan Mortgage Corp., 3.000%, 12/1/46	16,524
7,804	Federal Home Loan Mortgage Corp., 3.000%, 11/1/47	6,979
87,084	Federal Home Loan Mortgage Corp., 3.500%, 8/1/46	80,617
81,194	Federal Home Loan Mortgage Corp., 3.500%, 8/1/46	75,164
8,679	Federal Home Loan Mortgage Corp., 3.500%, 6/1/47	8,007
85,772	Federal Home Loan Mortgage Corp., 3.500%, 4/1/52	78,330
254,162	Federal Home Loan Mortgage Corp., 3.500%, 4/1/52	232,537
89,343	Federal Home Loan Mortgage Corp., 4.000%, 11/1/37	86,191
108,223	Federal Home Loan Mortgage Corp., 4.000%, 2/1/40	103,629
131,077	Federal Home Loan Mortgage Corp., 4.000%, 11/1/40	125,513
135,374	Federal Home Loan Mortgage Corp., 4.000%, 11/1/40	129,627
82,882	Federal Home Loan Mortgage Corp., 4.000%, 1/1/41	79,363
11,852	Federal Home Loan Mortgage Corp., 4.000%, 4/1/47	11,224
22,179	Federal Home Loan Mortgage Corp., 4.000%, 9/1/51	20,749
14,651	Federal Home Loan Mortgage Corp., 4.500%, 8/1/34	14,398
49,652	Federal Home Loan Mortgage Corp., 4.500%, 5/1/40	48,883
25,655	Federal Home Loan Mortgage Corp., 4.500%, 7/1/40	25,257
48,430	Federal Home Loan Mortgage Corp., 4.500%, 5/1/41	47,679
10,907	Federal Home Loan Mortgage Corp., 5.000%, 11/1/34	10,963
10,260	Federal Home Loan Mortgage Corp., 5.000%, 8/1/37	10,312
2,648	Federal Home Loan Mortgage Corp., 5.000%, 5/1/39	2,647
6,579	Federal Home Loan Mortgage Corp., 5.000%, 12/1/39	6,577
22,901	Federal Home Loan Mortgage Corp., 5.000%, 10/1/49	22,466
191,231	Federal Home Loan Mortgage Corp., 5.000%, 12/1/49	188,920
93,899	Federal Home Loan Mortgage Corp., 5.000%, 10/1/52	93,809
195,741	Federal Home Loan Mortgage Corp., 5.000%, 4/1/53	191,196
393,000	Federal Home Loan Mortgage Corp., 5.000%, 4/1/53	383,876
99,680	Federal Home Loan Mortgage Corp., 5.000%, 4/1/53	97,534
6,863	Federal Home Loan Mortgage Corp., 5.500%, 11/1/34	7,021
188,598	Federal Home Loan Mortgage Corp., 5.500%, 7/1/49	190,069
3,754	Federal Home Loan Mortgage Corp., 6.000%, 1/1/38	3,875
7,908	Federal Home Loan Mortgage Corp., 6.000%, 10/1/38	8,157

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2347

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	U.S. Government and Agency Obligations — (continued)
99,789	Federal Home Loan Mortgage Corp., 6.000%, 4/1/53	$ 101,339
3,479	Federal Home Loan Mortgage Corp., 6.500%, 10/1/33	3,610
28,721	Federal Home Loan Mortgage Corp., 6.500%, 1/1/53	29,377
191,494	Federal Home Loan Mortgage Corp., 6.500%, 2/1/53	201,070
100,000	Federal Home Loan Mortgage Corp., 6.500%, 8/1/53	102,402
883,040	Federal National Mortgage Association, 1.500%, 11/1/41	711,545
539,274	Federal National Mortgage Association, 1.500%, 1/1/42	434,762
361,055	Federal National Mortgage Association, 1.500%, 1/1/42	290,782
461,482	Federal National Mortgage Association, 1.500%, 2/1/42	371,471
181,722	Federal National Mortgage Association, 1.500%, 3/1/42	146,201
184,949	Federal National Mortgage Association, 2.000%, 3/1/52	149,870
17,323	Federal National Mortgage Association, 2.500%, 3/1/43	14,859
12,919	Federal National Mortgage Association, 2.500%, 4/1/43	11,082
5,637	Federal National Mortgage Association, 2.500%, 8/1/43	4,836
13,242	Federal National Mortgage Association, 2.500%, 4/1/45	11,360
20,216	Federal National Mortgage Association, 2.500%, 4/1/45	17,340
9,829	Federal National Mortgage Association, 2.500%, 8/1/45	8,432
69,245	Federal National Mortgage Association, 2.500%, 9/1/50	59,510
76,587	Federal National Mortgage Association, 2.500%, 9/1/50	65,579
831,077	Federal National Mortgage Association, 2.500%, 5/1/51	712,707
262,751	Federal National Mortgage Association, 2.500%, 11/1/51	224,674
267,824	Federal National Mortgage Association, 2.500%, 12/1/51	228,212
631,457	Federal National Mortgage Association, 2.500%, 1/1/52	537,826
88,550	Federal National Mortgage Association, 2.500%, 2/1/52	75,659

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

48Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	U.S. Government and Agency Obligations — (continued)
797,636	Federal National Mortgage Association, 2.500%, 4/1/52	$ 672,190
270,677	Federal National Mortgage Association, 2.500%, 4/1/52	230,925
1,338,426	Federal National Mortgage Association, 2.500%, 4/1/52	1,128,692
30,081	Federal National Mortgage Association, 3.000%, 10/1/30	28,587
10,179	Federal National Mortgage Association, 3.000%, 2/1/43	9,135
2,611	Federal National Mortgage Association, 3.000%, 5/1/46	2,331
4,244	Federal National Mortgage Association, 3.000%, 10/1/46	3,794
2,709	Federal National Mortgage Association, 3.000%, 1/1/47	2,419
83,323	Federal National Mortgage Association, 3.000%, 3/1/47	74,656
42,006	Federal National Mortgage Association, 3.000%, 4/1/47	37,546
434,458	Federal National Mortgage Association, 3.000%, 1/1/52	384,963
583,279	Federal National Mortgage Association, 3.000%, 3/1/52	519,922
2,000,000	Federal National Mortgage Association, 3.000%, 8/1/53 (TBA)	1,749,766
89,520	Federal National Mortgage Association, 3.000%, 2/1/57	77,571
5,588	Federal National Mortgage Association, 3.500%, 2/1/49	5,070
147,121	Federal National Mortgage Association, 3.500%, 5/1/49	136,225
226,709	Federal National Mortgage Association, 3.500%, 5/1/49	211,592
21,093	Federal National Mortgage Association, 3.500%, 4/1/52	19,118
80,710	Federal National Mortgage Association, 3.500%, 4/1/52	73,126
164,929	Federal National Mortgage Association, 3.500%, 4/1/52	150,858
177,959	Federal National Mortgage Association, 3.500%, 5/1/52	162,519
73,796	Federal National Mortgage Association, 4.000%, 10/1/40	71,037

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2349

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	U.S. Government and Agency Obligations — (continued)
107,959	Federal National Mortgage Association, 4.000%, 3/1/41	$ 103,255
155,356	Federal National Mortgage Association, 4.000%, 6/1/42	148,632
48,852	Federal National Mortgage Association, 4.000%, 9/1/42	46,725
36,928	Federal National Mortgage Association, 4.000%, 11/1/50	34,683
18,487	Federal National Mortgage Association, 4.000%, 12/1/50	17,316
7,852	Federal National Mortgage Association, 4.000%, 1/1/51	7,348
10,993	Federal National Mortgage Association, 4.000%, 2/1/51	10,298
12,990	Federal National Mortgage Association, 4.000%, 4/1/51	12,175
27,064	Federal National Mortgage Association, 4.000%, 6/1/51	25,323
74,502	Federal National Mortgage Association, 4.000%, 7/1/51	69,674
38,037	Federal National Mortgage Association, 4.000%, 7/1/56	35,623
68,176	Federal National Mortgage Association, 4.000%, 1/1/57	63,764
600,000	Federal National Mortgage Association, 4.500%, 8/1/38 (TBA)	587,719
99,086	Federal National Mortgage Association, 4.500%, 6/1/40	97,178
76,619	Federal National Mortgage Association, 4.500%, 4/1/41	75,830
104,475	Federal National Mortgage Association, 4.500%, 9/1/43	102,735
167,387	Federal National Mortgage Association, 4.500%, 12/1/43	162,899
66,175	Federal National Mortgage Association, 4.500%, 1/1/44	65,073
840,293	Federal National Mortgage Association, 4.500%, 7/1/44	821,971
59,105	Federal National Mortgage Association, 4.500%, 8/1/47	58,046
48,679	Federal National Mortgage Association, 5.000%, 5/1/31	48,512
1,000,000	Federal National Mortgage Association, 5.000%, 8/1/38 (TBA)	993,047

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

50Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	U.S. Government and Agency Obligations — (continued)
9,554	Federal National Mortgage Association, 5.000%, 6/1/49	$ 9,386
94,746	Federal National Mortgage Association, 5.000%, 10/1/50	93,777
98,413	Federal National Mortgage Association, 5.000%, 6/1/52	96,419
284,514	Federal National Mortgage Association, 5.000%, 8/1/52	277,912
302,388	Federal National Mortgage Association, 5.000%, 8/1/52	295,605
99,622	Federal National Mortgage Association, 5.000%, 4/1/53	97,358
100,000	Federal National Mortgage Association, 5.000%, 8/1/53 (TBA)	97,684
2,092	Federal National Mortgage Association, 5.500%, 3/1/34	2,077
4,522	Federal National Mortgage Association, 5.500%, 12/1/34	4,529
23,872	Federal National Mortgage Association, 5.500%, 10/1/35	24,296
9,916	Federal National Mortgage Association, 5.500%, 12/1/35	10,147
11,658	Federal National Mortgage Association, 5.500%, 12/1/35	11,927
6,287	Federal National Mortgage Association, 5.500%, 5/1/37	6,444
65,682	Federal National Mortgage Association, 5.500%, 5/1/38	67,162
97,450	Federal National Mortgage Association, 5.500%, 4/1/50	98,209
190,633	Federal National Mortgage Association, 5.500%, 4/1/50	192,119
98,232	Federal National Mortgage Association, 5.500%, 1/1/53	98,135
99,482	Federal National Mortgage Association, 5.500%, 2/1/53	99,384
98,786	Federal National Mortgage Association, 5.500%, 4/1/53	98,331
97,037	Federal National Mortgage Association, 5.500%, 4/1/53	96,481
100,000	Federal National Mortgage Association, 5.500%, 7/1/53	100,282
2,000,000	Federal National Mortgage Association, 5.500%, 8/1/53 (TBA)	1,986,094

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2351

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	U.S. Government and Agency Obligations — (continued)
227	Federal National Mortgage Association, 6.000%, 9/1/29	$ 233
718	Federal National Mortgage Association, 6.000%, 8/1/32	736
5,256	Federal National Mortgage Association, 6.000%, 12/1/33	5,291
4,743	Federal National Mortgage Association, 6.000%, 10/1/37	4,896
3,361	Federal National Mortgage Association, 6.000%, 12/1/37	3,466
48,665	Federal National Mortgage Association, 6.000%, 1/1/53	49,856
19,549	Federal National Mortgage Association, 6.000%, 1/1/53	19,904
97,331	Federal National Mortgage Association, 6.000%, 1/1/53	98,740
99,596	Federal National Mortgage Association, 6.000%, 3/1/53	100,313
99,702	Federal National Mortgage Association, 6.000%, 5/1/53	102,146
99,605	Federal National Mortgage Association, 6.000%, 5/1/53	101,111
99,891	Federal National Mortgage Association, 6.000%, 6/1/53	101,685
100,000	Federal National Mortgage Association, 6.000%, 7/1/53	101,364
100,000	Federal National Mortgage Association, 6.000%, 7/1/53	101,709
100,000	Federal National Mortgage Association, 6.000%, 7/1/53	101,580
1,500,000	Federal National Mortgage Association, 6.000%, 8/15/53 (TBA)	1,508,906
4,176	Federal National Mortgage Association, 6.500%, 4/1/29	4,194
2,475	Federal National Mortgage Association, 6.500%, 7/1/29	2,524
7,106	Federal National Mortgage Association, 6.500%, 5/1/32	7,352
6,570	Federal National Mortgage Association, 6.500%, 9/1/32	6,810
2,987	Federal National Mortgage Association, 6.500%, 10/1/32	3,049
97,172	Federal National Mortgage Association, 6.500%, 3/1/53	100,337

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

52Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	U.S. Government and Agency Obligations — (continued)
100,000	Federal National Mortgage Association, 6.500%, 8/1/53	$ 102,285
8,462	Federal National Mortgage Association, 7.000%, 1/1/36	8,680
600,000	Government National Mortgage Association, 3.000%, 8/20/53 (TBA)	533,742
200,000	Government National Mortgage Association, 3.500%, 8/20/53 (TBA)	183,750
700,000	Government National Mortgage Association, 5.000%, 8/15/53 (TBA)	685,891
500,000	Government National Mortgage Association, 5.500%, 8/15/53 (TBA)	496,875
700,000	Government National Mortgage Association, 6.000%, 8/15/53 (TBA)	703,309
65,884	Government National Mortgage Association I, 3.500%, 11/15/41	61,691
8,651	Government National Mortgage Association I, 3.500%, 10/15/42	8,100
109,518	Government National Mortgage Association I, 4.000%, 9/15/41	104,794
19,041	Government National Mortgage Association I, 4.000%, 4/15/45	18,224
31,131	Government National Mortgage Association I, 4.000%, 6/15/45	29,961
19,451	Government National Mortgage Association I, 4.500%, 5/15/39	19,131
4,612	Government National Mortgage Association I, 5.500%, 8/15/33	4,656
7,917	Government National Mortgage Association I, 5.500%, 9/15/33	7,907
4,956	Government National Mortgage Association I, 6.000%, 10/15/33	4,993
8,272	Government National Mortgage Association I, 6.000%, 9/15/34	8,337
22,038	Government National Mortgage Association I, 6.000%, 9/15/38	22,825
1,595	Government National Mortgage Association I, 6.500%, 10/15/28	1,623
5,447	Government National Mortgage Association I, 6.500%, 5/15/31	5,544
5,306	Government National Mortgage Association I, 6.500%, 6/15/32	5,405
8,100	Government National Mortgage Association I, 6.500%, 12/15/32	8,258

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2353

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	U.S. Government and Agency Obligations — (continued)
11,083	Government National Mortgage Association I, 6.500%, 5/15/33	$ 11,281
105	Government National Mortgage Association I, 7.000%, 8/15/28	106
1,993	Government National Mortgage Association I, 8.000%, 2/15/30	1,989
673,800	Government National Mortgage Association II, 3.500%, 9/20/52	618,852
478,885	Government National Mortgage Association II, 4.000%, 9/20/52	450,916
26,776	Government National Mortgage Association II, 4.500%, 9/20/44	26,461
12,663	Government National Mortgage Association II, 4.500%, 10/20/44	12,507
25,133	Government National Mortgage Association II, 4.500%, 11/20/44	24,824
476,205	Government National Mortgage Association II, 4.500%, 9/20/52	458,129
9,887	Government National Mortgage Association II, 5.500%, 2/20/34	10,080
100,369	Government National Mortgage Association II, 5.500%, 9/20/52	99,768
13,277	Government National Mortgage Association II, 6.500%, 11/20/28	13,488
795	Government National Mortgage Association II, 7.500%, 9/20/29	805
1,357,000	U.S. Treasury Bonds, 2.000%, 2/15/50	903,412
2,440,000	U.S. Treasury Bonds, 3.000%, 2/15/48	2,001,181
12,374,000	U.S. Treasury Bonds, 3.125%, 5/15/48	10,385,943
255,000	U.S. Treasury Bonds, 3.625%, 2/15/53	237,827
5,039,000	U.S. Treasury Notes, 1.125%, 2/15/31	4,121,154
2,500,000	U.S. Treasury Notes, 1.500%, 2/15/30	2,132,324
340,000	U.S. Treasury Notes, 2.625%, 5/31/27	319,507
250,000	U.S. Treasury Notes, 2.750%, 5/31/29	231,943
2,090,000	U.S. Treasury Notes, 2.875%, 5/15/32	1,919,861
850,000	U.S. Treasury Notes, 3.250%, 6/30/27	817,428
353,000	U.S. Treasury Notes, 3.375%, 5/15/33	336,729
2,830,000	U.S. Treasury Notes, 3.500%, 2/15/33	2,727,412
	Total U.S. Government and Agency Obligations (Cost $59,814,956)	$55,630,379

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

54Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Shares		Value
	SHORT TERM INVESTMENTS — 6.3% of Net Assets
	Open-End Fund — 6.3%
26,266,484(k)	Dreyfus Government Cash Management, Institutional Shares, 5.14%	$ 26,266,484
		$ 26,266,484


	TOTAL SHORT TERM INVESTMENTS (Cost $26,266,484)	$26,266,484


	TOTAL INVESTMENTS IN UNAFFILIATED ISSUERS — 102.0% (Cost $356,949,034)	$423,835,388

		Dividend Income	Net Realized Gain (Loss)	Change in Net Unrealized Appreciation (Depreciation)
	Affiliated Issuer — 0.2%
	Closed-End Fund — 0.2% of Net Assets
115,672(l)	Pioneer ILS Interval Fund	$24,446	$—	$48,899	$ 1,023,698
	Total Closed-End Fund (Cost $1,166,789)				$ 1,023,698


	Total Investments in Affiliated Issuer — 0.2% (Cost $1,166,789)				$ 1,023,698


	OTHER ASSETS AND LIABILITIES — (2.2)%				$ (9,290,902)
	net assets — 100.0%				$415,568,184

(A.D.R.)	American Depositary Receipts.
(G.D.R.)	Global Depositary Receipts.
(TBA)	“To Be Announced” Securities.
bps	Basis Points.
CMT	Constant Maturity Treasury Index.
FREMF	Freddie Mac Multifamily Fixed-Rate Mortgage Loans.
LIBOR	London Interbank Offered Rate.
REIT	Real Estate Investment Trust.
REMICs	Real Estate Mortgage Investment Conduits.
SOFR	Secured Overnight Financing Rate.
SOFR30A	Secured Overnight Financing Rate 30 Day Average.

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2355

Table of Contents

Schedule of Investments | 7/31/23 (continued)

(144A)

The resale of such security is exempt from registration under Rule 144A of the Securities Act of 1933. Such securities may be resold normally to qualified institutional buyers. At July 31, 2023, the value of these securities amounted to $46,543,358, or 11.2% of net assets.

(a)	Floating rate note. Coupon rate, reference index and spread shown at July 31, 2023.
(b)	Non-income producing security.
(c)	The interest rate is subject to change periodically. The interest rate and/or reference index and spread shown at July 31, 2023.
(d)	Security represents the interest-only portion payments on a pool of underlying mortgages or mortgage-backed securities.
(e)	Securities purchased on a when-issued basis. Rates do not take effect until settlement date.
(f)	Security is perpetual in nature and has no stated maturity date.
(g)	Debt obligation initially issued at one coupon which converts to a higher coupon at a speciﬁc date. The rate shown is the rate at July 31, 2023.
(h)	Consists of Revenue Bonds unless otherwise indicated.
(i)	Security issued with a zero coupon. Income is recognized through accretion of discount.
(j)	Issued as participation notes.
(k)	Rate periodically changes. Rate disclosed is the 7-day yield at July 31, 2023.
(l)	Pioneer ILS Interval Fund is an affiliated closed-end fund managed by Amundi Asset Management US, Inc. (the “Adviser”).
*	Senior secured ﬂoating rate loan interests in which the Fund invests generally pay interest at rates that are periodically re-determined 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 or SOFR, (ii) the prime rate offered by one or more major United States banks, (iii) the rate of a certiﬁcate of deposit or (iv) other base lending rates used by commercial lenders. The interest rate shown is the rate accruing at July 31, 2023.
†	Amount rounds to less than 0.1%.
+	Security is valued using significant unobservable inputs (Level 3).
#	Securities are restricted as to resale.

Restricted Securities	Acquisition date	Cost	Value
Bonanza Re	12/15/2020	$250,000	$224,800
Easton Re Pte	12/15/2020	250,000	248,100
Sector Re V	4/23/2019	68,166	50,740
Total Restricted Securities			$523,640
% of Net assets			0.1%

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

56Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

FUTURES CONTRACTS
FIXED INCOME INDEX FUTURES CONTRACTS

Number of Contracts Long	Description	Expiration Date	Notional Amount	Market Value	Unrealized (Depreciation)
71	U.S. 2 Year Note (CBT)	9/29/23	$14,632,016	$14,415,219	$(216,797)
201	U.S. 5 Year Note (CBT)	9/29/23	21,648,836	21,470,882	(177,954)
19	U.S. 10 Year Note (CBT)	9/20/23	2,148,160	2,116,719	(31,441)
19	U.S. 10 Year Ultra Bond (CBT)	9/20/23	2,224,767	2,222,703	(2,064)
45	U.S. Long Bond (CBT)	9/20/23	5,709,387	5,599,688	(109,699)
			$46,363,166	$45,825,211	$(537,955)

Number of Contracts Short	Description	Expiration Date	Notional Amount	Market Value	Unrealized Appreciation
13	U.S. Ultra Bond (CBT)	9/20/23	$ (1,722,691)	$ (1,718,844)	$ 3,847
TOTAL FUTURES CONTRACTS			$44,640,475	$44,106,367	$(534,108)

Principal amounts are denominated in U.S. dollars (“USD”) unless otherwise noted.

Purchases and sales of securities (excluding short-term investments) for the year ended July 31, 2023 were as follows:

	Purchases	Sales
Long-Term U.S. Government Securities	$ 14,745,749	$ 7,404,853
Other Long-Term Securities	$149,345,854	$165,008,872

At July 31, 2023, the net unrealized appreciation on investments based on cost for federal tax purposes of $358,076,367 was as follows:

Aggregate gross unrealized appreciation for all investments in which there is an excess of value over tax cost	$ 83,793,918
Aggregate gross unrealized depreciation for all investments in which there is an excess of tax cost over value	(17,545,307)
Net unrealized appreciation	$ 66,248,611

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2357

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels below.

Level 1	–	unadjusted 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 risks, etc.). See Notes to Financial Statements — Note 1A.
Level 3	–	significant unobservable inputs (including the Adviser's own assumptions in determining fair value of investments). See Notes to Financial Statements — Note 1A.

The following is a summary of the inputs used as of July 31, 2023, in valuing the Fund's investments:

	Level 1	Level 2	Level 3	Total
Senior Secured Floating Rate Loan Interests	$ —	$ 538,587	$ —	$ 538,587
Common Stocks	261,292,707	—	—	261,292,707
Asset Backed Securities	—	8,215,571	—	8,215,571
Collateralized Mortgage Obligations	—	11,386,174	—	11,386,174
Commercial Mortgage-Backed Securities	—	6,603,078	—	6,603,078
Convertible Corporate Bonds	—	6,876,440	—	6,876,440
Corporate Bonds	—	43,510,788	—	43,510,788
Convertible Preferred Stock	680,277	—	—	680,277
Municipal Bonds	—	267,471	—	267,471
Preferred Stock	1,847,048	—	—	1,847,048
Insurance-Linked Securities
Reinsurance Sidecars
Multiperil – Worldwide	—	—	50,740	50,740
All Other Insurance-Linked Securities	—	472,900	—	472,900
Foreign Government Bond	—	196,744	—	196,744
U.S. Government and Agency Obligations	—	55,630,379	—	55,630,379
Open-End Fund	26,266,484	—	—	26,266,484
Affiliated Closed-End Fund	1,023,698	—	—	1,023,698
Total Investments in Securities	$ 291,110,214	$133,698,132	$ 50,740	$ 424,859,086
Other Financial Instruments
Net unrealized depreciation on futures contracts	$ (534,108)	$ —	$ —	$ (534,108)
Total Other Financial Instruments	$ (534,108)	$ —	$ —	$ (534,108)

During the year ended July 31, 2023, there were no significant transfers in or out of Level 3.

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

58Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Statement of Assets and Liabilities | 7/31/23

ASSETS:
Investments in unaffiliated issuers, at value (cost $356,949,034)	$423,835,388
Investments in affiliated issuers, at value (cost $1,166,789)	1,023,698
Cash	263,277
Foreign currencies, at value (cost $161)	165
Futures collateral	691,690
Collateral due from broker for TBA Securities	10,000
Variation margin for futures contracts	24,750
Receivables —
Investment securities sold	906,753
Fund shares sold	156,350
Dividends	234,746
Interest	1,214,943
Due from the Adviser	1,646
Other assets	27,099
Total assets	$ 428,390,505
LIABILITIES:
Payables —
Investment securities purchased	$ 11,971,889
Fund shares repurchased	578,642
Distributions	13
Trustees' fees	2,009
Management fees	28,173
Administrative expenses	10,162
Distribution fees	14,444
Accrued expenses	216,989
Total liabilities	$ 12,822,321
NET ASSETS:
Paid-in capital	$358,227,505
Distributable earnings	57,340,679
Net assets	$415,568,184
NET ASSET VALUE PER SHARE:
No par value (unlimited number of shares authorized)
Class A (based on $270,803,573/27,221,970 shares)	$ 9.95
Class C (based on $35,935,673/3,651,785 shares)	$ 9.84
Class K (based on $38,360,068/3,865,153 shares)	$ 9.92
Class R (based on $3,948,202/396,077 shares)	$ 9.97
Class Y (based on $66,520,668/6,627,907 shares)	$ 10.04
MAXIMUM OFFERING PRICE PER SHARE:
Class A (based on $9.95 net asset value per share/100%-4.50% maximum sales charge)	$ 10.42

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/23 59

Table of Contents

Statement of Operations FOR THE YEAR ENDED 7/31/23

INVESTMENT INCOME:
Interest from unaffiliated issuers (net of foreign taxes withheld $846)	$ 6,309,458
Dividends from unaffiliated issuers (net of foreign taxes withheld $52,415)	5,398,108
Dividends from affiliated issuers	24,446
Total Investment Income		$ 11,732,012
EXPENSES:
Management fees	$ 1,975,202
Administrative expenses	149,557
Transfer agent fees
Class A	120,296
Class C	18,620
Class K	176
Class R	3,066
Class Y	72,989
Distribution fees
Class A	662,462
Class C	382,218
Class R	16,953
Shareowner communications expense	59,986
Custodian fees	3,651
Registration fees	86,427
Professional fees	144,230
Printing expense	18,088
Officers' and Trustees' fees	20,025
Insurance expense	4,218
Miscellaneous	143,659
Total expenses		$ 3,881,823
Less fees waived and expenses reimbursed by the Adviser		(119,815)
Net expenses		$ 3,762,008
Net investment income		$ 7,970,004
REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS:
Net realized gain (loss) on:
Investments in unaffiliated issuers	$ (7,831,541)
Futures contracts	(1,275,020)
Other assets and liabilities denominated in foreign currencies	57,937	$ (9,048,624)
Change in net unrealized appreciation (depreciation) on:
Investments in unaffiliated issuers	$26,384,552
Investments in affiliated issuers	48,899
Futures contracts	(732,907)
Other assets and liabilities denominated in foreign currencies	(274)	$25,700,270
Net realized and unrealized gain (loss) on investments		$16,651,646
Net increase in net assets resulting from operations		$24,621,650

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

60Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Statements of Changes in Net Assets

	Year Ended 7/31/23	Year Ended 7/31/22
FROM OPERATIONS:
Net investment income (loss)	$ 7,970,004	$ 4,439,971
Net realized gain (loss) on investments	(9,048,624)	12,713,768
Change in net unrealized appreciation (depreciation) on investments	25,700,270	(49,462,972)
Net increase (decrease) in net assets resulting from operations	$ 24,621,650	$ (32,309,233)
DISTRIBUTIONS TO SHAREOWNERS:
Class A ($0.31 and $0.91 per share, respectively)	$ (8,818,454)	$ (24,678,235)
Class C ($0.25 and $0.83 per share, respectively)	(1,055,140)	(3,865,458)
Class K ($0.34 and $0.95 per share, respectively)	(619,119)	(393,068)
Class R ($0.28 and $0.88 per share, respectively)	(100,787)	(166,585)
Class Y ($0.33 and $0.94 per share, respectively)	(2,421,250)	(6,264,634)
Total distributions to shareowners	$ (13,014,750)	$ (35,367,980)
FROM FUND SHARE TRANSACTIONS:
Net proceeds from sales of shares	$ 79,317,089	$ 85,210,523
Reinvestment of distributions	12,781,779	34,584,331
Cost of shares repurchased	(96,329,928)	(76,584,713)
Net increase (decrease) in net assets resulting from Fund share transactions	$ (4,231,060)	$ 43,210,141
Net increase (decrease) in net assets	$ 7,375,840	$ (24,467,072)
NET ASSETS:
Beginning of year	$408,192,344	$432,659,416
End of year	$415,568,184	$408,192,344

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2361

Table of Contents

Statements of Changes in Net Assets (continued)

	Year Ended 7/31/23 Shares	Year Ended 7/31/23 Amount	Year Ended 7/31/22 Shares	Year Ended 7/31/22 Amount
Class A
Shares sold	2,865,557	$ 26,869,048	3,892,101	$ 41,513,795
Reinvestment of distributions	934,805	8,615,109	2,248,900	24,068,744
Less shares repurchased	(5,555,638)	(51,920,689)	(3,777,059)	(39,682,763)
Net increase (decrease)	(1,755,276)	$(16,436,532)	2,363,942	$ 25,899,776
Class C
Shares sold	302,886	$ 2,798,958	740,583	$ 7,924,096
Reinvestment of distributions	115,665	1,054,662	363,341	3,865,458
Less shares repurchased	(1,339,715)	(12,410,536)	(1,467,546)	(15,492,417)
Net decrease	(921,164)	$ (8,556,916)	(363,622)	$ (3,702,863)
Class K
Shares sold	3,547,274	$ 33,238,329	632,906	$ 6,535,090
Reinvestment of distributions	66,599	619,119	36,982	391,612
Less shares repurchased	(550,872)	(5,126,715)	(95,764)	(957,960)
Net increase	3,063,001	$ 28,730,733	574,124	$ 5,968,742
Class R
Shares sold	136,795	$ 1,266,678	167,700	$ 1,719,826
Reinvestment of distributions	10,923	100,787	15,541	166,585
Less shares repurchased	(49,484)	(463,625)	(95,664)	(1,027,343)
Net increase	98,234	$ 903,840	87,577	$ 859,068
Class Y
Shares sold	1,603,646	$ 15,144,076	2,599,392	$ 27,517,716
Reinvestment of distributions	257,110	2,392,102	565,081	6,091,932
Less shares repurchased	(2,809,314)	(26,408,363)	(1,844,458)	(19,424,230)
Net increase (decrease)	(948,558)	$ (8,872,185)	1,320,015	$ 14,185,418

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

62Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Financial Highlights

	Year Ended 7/31/23	Year Ended 7/31/22	Year Ended 7/31/21	Year Ended 7/31/20	Year Ended 7/31/19
Class A
Net asset value, beginning of period	$ 9.66	$ 11.31	$ 9.72	$ 9.57	$ 9.64
Increase (decrease) from investment operations:
Net investment income (loss) (a)	$ 0.19	$ 0.11	$ 0.12	$ 0.15	$ 0.18
Net realized and unrealized gain (loss) on investments	0.41	(0.85)	1.84	0.54	0.56
Net increase (decrease) from investment operations	$ 0.60	$ (0.74)	$ 1.96	$ 0.69	$ 0.74
Distributions to shareowners:
Net investment income	$ (0.18)	$ (0.13)	$ (0.11)	$ (0.15)	$ (0.18)
Net realized gain	(0.13)	(0.78)	(0.26)	(0.39)	(0.63)
Total distributions	$ (0.31)	$ (0.91)	$ (0.37)	$ (0.54)	$ (0.81)
Net increase (decrease) in net asset value	$ 0.29	$ (1.65)	$ 1.59	$ 0.15	$ (0.07)
Net asset value, end of period	$ 9.95	$ 9.66	$ 11.31	$ 9.72	$ 9.57
Total return (b)	6.51%	(7.23)%	20.60%	7.55%	8.51%
Ratio of net expenses to average net assets	0.94%	0.95%	0.99%	0.99%	1.01%
Ratio of net investment income (loss) to average net assets	2.02%	1.07%	1.12%	1.65%	1.97%
Portfolio turnover rate	44%	40%	54%	65%	60%
Net assets, end of period (in thousands)	$270,804	$279,982	$301,068	$233,421	$219,544
Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly:
Total expenses to average net assets	0.96%	0.95%	1.00%	1.04%	1.07%
Net investment income (loss) to average net assets	2.00%	1.07%	1.11%	1.60%	1.91%

(a)	The per-share data presented above is based on the average shares outstanding for the period presented.
(b)	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.

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2363

Table of Contents

Financial Highlights (continued)

	Year Ended 7/31/23	Year Ended 7/31/22	Year Ended 7/31/21	Year Ended 7/31/20	Year Ended 7/31/19
Class C
Net asset value, beginning of period	$ 9.57	$ 11.21	$ 9.65	$ 9.50	$ 9.57
Increase (decrease) from investment operations:
Net investment income (loss) (a)	$ 0.12	$ 0.03	$ 0.04	$ 0.09	$ 0.11
Net realized and unrealized gain (loss) on investments	0.40	(0.84)	1.82	0.54	0.55
Net increase (decrease) from investment operations	$ 0.52	$ (0.81)	$ 1.86	$ 0.63	$ 0.66
Distributions to shareowners:
Net investment income	$ (0.12)	$ (0.05)	$ (0.04)	$ (0.09)	$ (0.10)
Net realized gain	(0.13)	(0.78)	(0.26)	(0.39)	(0.63)
Total distributions	$ (0.25)	$ (0.83)	$ (0.30)	$ (0.48)	$ (0.73)
Net increase (decrease) in net asset value	$ 0.27	$ (1.64)	$ 1.56	$ 0.15	$ (0.07)
Net asset value, end of period	$ 9.84	$ 9.57	$ 11.21	$ 9.65	$ 9.50
Total return (b)	5.69%	(7.92)%	19.63%	6.82%	7.68%
Ratio of net expenses to average net assets	1.69%	1.68%	1.72%	1.72%	1.75%
Ratio of net investment income (loss) to average net assets	1.28%	0.33%	0.41%	0.92%	1.23%
Portfolio turnover rate	44%	40%	54%	65%	60%
Net assets, end of period (in thousands)	$35,936	$43,776	$55,342	$56,387	$46,993
Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly:
Total expenses to average net assets	1.70%	1.69%	1.73%	1.76%	1.79%
Net investment income (loss) to average net assets	1.27%	0.32%	0.40%	0.88%	1.19%

(a)	The per-share data presented above is based on the average shares outstanding for the period presented.
(b)	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.

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

64Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

	Year Ended 7/31/23	Year Ended 7/31/22	Year Ended 7/31/21	Year Ended 7/31/20	Year Ended 7/31/19
Class K
Net asset value, beginning of period	$ 9.64	$11.29	$ 9.71	$ 9.56	$ 9.63
Increase (decrease) from investment operations:
Net investment income (loss) (a)	$ 0.22	$ 0.15	$ 0.15	$ 0.18	$ 0.20
Net realized and unrealized gain (loss) on investments	0.40	(0.85)	1.84	0.54	0.55
Net increase (decrease) from investment operations	$ 0.62	$ (0.70)	$ 1.99	$ 0.72	$ 0.75
Distributions to shareowners:
Net investment income	$ (0.21)	$ (0.17)	$ (0.15)	$ (0.18)	$ (0.19)
Net realized gain	(0.13)	(0.78)	(0.26)	(0.39)	(0.63)
Total distributions	$ (0.34)	$ (0.95)	$ (0.41)	$(0.57)	$(0.82)
Net increase (decrease) in net asset value	$ 0.28	$ (1.65)	$ 1.58	$ 0.15	$ (0.07)
Net asset value, end of period	$ 9.92	$ 9.64	$11.29	$ 9.71	$ 9.56
Total return (b)	6.72%	(6.90)%	20.96%	7.93%	8.72%
Ratio of net expenses to average net assets	0.65%	0.65%	0.65%	0.65%	0.76%
Ratio of net investment income (loss) to average net assets	2.35%	1.44%	1.43%	1.95%	2.21%
Portfolio turnover rate	44%	40%	54%	65%	60%
Net assets, end of period (in thousands)	$38,360	$7,732	$2,575	$ 606	$ 281
Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly:
Total expenses to average net assets	0.66%	0.65%	0.70%	0.71%	0.81%
Net investment income (loss) to average net assets	2.34%	1.44%	1.38%	1.89%	2.16%

(a)	The per-share data presented above is based on the average shares outstanding for the period presented.
(b)	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.

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2365

Table of Contents

Financial Highlights (continued)

	Year Ended 7/31/23	Year Ended 7/31/22	Year Ended 7/31/21	Year Ended 7/31/20	Year Ended 7/31/19
Class R
Net asset value, beginning of period	$ 9.68	$11.33	$ 9.75	$ 9.59	$ 9.64
Increase (decrease) from investment operations:
Net investment income (loss) (a)	$ 0.16	$ 0.09	$ 0.09	$ 0.12	$ 0.15
Net realized and unrealized gain (loss) on investments	0.41	(0.86)	1.83	0.56	0.56
Net increase (decrease) from investment operations	$ 0.57	$ (0.77)	$ 1.92	$ 0.68	$ 0.71
Distributions to shareowners:
Net investment income	$ (0.15)	$ (0.10)	$ (0.08)	$ (0.13)	$ (0.13)
Net realized gain	(0.13)	(0.78)	(0.26)	(0.39)	(0.63)
Total distributions	$ (0.28)	$ (0.88)	$ (0.34)	$ (0.52)	$ (0.76)
Net increase (decrease) in net asset value	$ 0.29	$ (1.65)	$ 1.58	$ 0.16	$ (0.05)
Net asset value, end of period	$ 9.97	$ 9.68	$11.33	$ 9.75	$ 9.59
Total return (b)	6.19%	(7.45)%	20.12%	7.32%	8.24%
Ratio of net expenses to average net assets	1.25%	1.20%	1.30%	1.30%	1.30%
Ratio of net investment income (loss) to average net assets	1.73%	0.84%	0.81%	1.32%	1.65%
Portfolio turnover rate	44%	40%	54%	65%	60%
Net assets, end of period (in thousands)	$3,948	$2,884	$2,383	$2,047	$1,363
Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly:
Total expenses to average net assets	1.26%	1.20%	1.45%	1.59%	1.77%
Net investment income (loss) to average net assets	1.72%	0.84%	0.66%	1.03%	1.18%

(a)	The per-share data presented above is based on the average shares outstanding for the period presented.
(b)	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.

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

66Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

	Year Ended 7/31/23	Year Ended 7/31/22	Year Ended 7/31/21	Year Ended 7/31/20	Year Ended 7/31/19
Class Y
Net asset value, beginning of period	$ 9.74	$ 11.39	$ 9.79	$ 9.64	$ 9.71
Increase (decrease) from investment operations:
Net investment income (loss) (a)	$ 0.22	$ 0.14	$ 0.15	$ 0.19	$ 0.21
Net realized and unrealized gain (loss) on investments	0.41	(0.85)	1.86	0.54	0.55
Net increase (decrease) from investment operations	$ 0.63	$ (0.71)	$ 2.01	$ 0.73	$ 0.76
Distributions to shareowners:
Net investment income	$ (0.20)	$ (0.16)	$ (0.15)	$ (0.19)	$ (0.20)
Net realized gain	(0.13)	(0.78)	(0.26)	(0.39)	(0.63)
Total distributions	$ (0.33)	$ (0.94)	$ (0.41)	$ (0.58)	$ (0.83)
Net increase (decrease) in net asset value	$ 0.30	$ (1.65)	$ 1.60	$ 0.15	$ (0.07)
Net asset value, end of period	$ 10.04	$ 9.74	$ 11.39	$ 9.79	$ 9.64
Total return (b)	6.85%	(6.95)%	20.99%	7.95%	8.77%
Ratio of net expenses to average net assets	0.65%	0.65%	0.65%	0.65%	0.69%
Ratio of net investment income (loss) to average net assets	2.32%	1.37%	1.46%	1.99%	2.29%
Portfolio turnover rate	44%	40%	54%	65%	60%
Net assets, end of period (in thousands)	$66,521	$73,819	$71,290	$53,142	$33,930
Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly:
Total expenses to average net assets	0.75%	0.75%	0.77%	0.82%	0.84%
Net investment income (loss) to average net assets	2.22%	1.27%	1.34%	1.82%	2.14%

(a)	The per-share data presented above is based on the average shares outstanding for the period presented.
(b)	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.

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

Pioneer Balanced ESG Fund | Annual Report | 7/31/2367

Table of Contents

Notes to Financial Statements | 7/31/23

1. Organization and Signiﬁcant Accounting Policies

Pioneer Balanced ESG Fund (the “Fund”) is one of four portfolios comprising Pioneer Series Trust IV (the "Trust"), a Delaware statutory trust. The Fund is registered under the Investment Company Act of 1940, as amended (the "1940 Act"), as a diversified, open-end management investment company. The Fund’s investment objective is to seek capital growth and current income through a diversified portfolio of equity securities and bonds.

The Fund offers ﬁve classes of shares designated as Class A, Class C, Class K, Class R and Class Y shares. 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 Trust gives the Board of Trustees the ﬂexibility to specify either per-share voting or dollar-weighted voting when submitting matters for shareowner approval. Under per-share voting, each share of a class of the Fund is entitled to one vote. Under dollar-weighted voting, a shareowner’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 or Class Y shares.

Amundi Asset Management US, Inc., an indirect, wholly owned subsidiary of Amundi and Amundi’s wholly owned subsidiary, Amundi USA, Inc., serves as the Fund’s investment adviser (the “Adviser”). Amundi Distributor US, Inc., an afﬁliate of the Adviser, serves as the Fund’s distributor (the “Distributor”).

68Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

contract modifications that occur during the period from March 12, 2020 through December 31, 2023. Management is evaluating the impact of ASU 2020-04 on the Fund's investments, derivatives, debt and other contracts, if applicable, that will undergo reference rate-related modifications as a result of the reference rate reform.

The Fund is required to comply with Rule 18f-4 under the 1940 Act, which governs the use of derivatives by registered investment companies. Rule 18f-4 permits funds to enter into derivatives transactions (as defined in Rule 18f-4) and certain other transactions notwithstanding the restrictions on the issuance of “senior securities” under Section 18 of the 1940 Act. In accordance with Rule 18f-4, the Fund has established and maintains a comprehensive derivatives risk management program, has appointed a derivatives risk manager and complies with a relative or absolute limit on fund leverage risk calculated based on value-at-risk ("VaR").

The Fund is an investment company and follows investment company accounting and reporting guidance under U.S. Generally Accepted Accounting Principles (“U.S. GAAP”). U.S. GAAP requires the management of the Fund to 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 gain or loss on investments during the reporting period. Actual results could differ from those estimates.

The following is a summary of signiﬁcant accounting policies followed by the Fund in the preparation of its ﬁnancial statements:

A.	Security Valuation
	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.
	Equity securities that have traded on an exchange are valued by using 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 or, if both last bid and asked prices are not available, at the last quoted bid price. Last sale and bid and asked prices are provided by independent third party pricing services. In the case of equity securities not traded on an exchange, prices are typically determined by independent third party pricing services using a variety of techniques and methods.

Pioneer Balanced ESG Fund | Annual Report | 7/31/2369

Table of Contents

	The value of foreign securities is translated into U.S. dollars based on foreign currency exchange rate quotations supplied by a third party pricing source. Trading in non-U.S. equity securities is substantially completed each day at various times prior to the close of the NYSE. The values of such securities used in computing the net asset value of the Fund's shares are determined as of such times. The Adviser may use a fair value model developed by an independent pricing service to value non-U.S. equity securities.
	Fixed-income securities are valued by using 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, or may use a pricing matrix or other fair value methods or techniques to provide an estimated value of the security or instrument. A pricing matrix is a means of valuing a debt security on the basis of current market prices for other debt securities, historical trading patterns in the market for fixed-income securities and/or other factors. Non-U.S. debt securities that are listed on an exchange will be valued at the bid price obtained from an independent third party pricing service. When independent third party pricing services are unable to supply prices, or when prices or market quotations are considered to be unreliable, the value of that security may be determined using quotations from one or more broker-dealers.
	Loan interests are valued 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 third party 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.
	Event-linked bonds are valued at the bid price obtained from an independent third party pricing service. Other insurance-linked securities (including reinsurance sidecars, collateralized reinsurance and industry loss warranties) may be valued at the bid price obtained from an independent pricing service, or through a third party using a pricing matrix, insurance valuation models, or other fair value methods or techniques to provide an estimated value of the instrument.
	Futures contracts are generally valued at the closing settlement price established by the exchange on which they are traded.
	Shares of open-end registered investment companies (including money market mutual funds) are valued at such funds' net asset value.

70Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

	Shares of closed-end interval funds that offer their shares at net asset value are valued at such funds’ net asset value.
	Repurchase agreements are valued at par. Cash may include overnight time deposits at approved financial institutions.
	Securities or loan interests for which independent pricing services or broker-dealers 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 the Adviser. The Adviser is designated as the valuation designee for the Fund pursuant to Rule 2a-5 under the 1940 Act. The Adviser’s fair valuation team is responsible for monitoring developments that may impact fair valued securities.
	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 Adviser 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.
B.	Investment Income and Transactions
	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 and net of income accrued on defaulted securities.
	Interest and dividend income payable by delivery of additional shares is reclassified as PIK (payment-in-kind) income upon receipt and is included in interest and dividend income, respectively.
	Principal amounts of mortgage-backed securities 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 purchase prices of

Pioneer Balanced ESG Fund | Annual Report | 7/31/2371

Table of Contents

	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.
	Security transactions are recorded as of trade date. Gains and losses on sales of investments are calculated on the identified cost method for both financial reporting and federal income tax purposes.
C.	Foreign Currency Translation
	The books and records of the Fund are maintained in U.S. dollars. Amounts denominated in foreign currencies are translated into U.S. dollars using current exchange rates.
	Net realized gains and losses on foreign currency transactions, if any, represent, among other things, the net realized gains and losses on foreign currency exchange contracts, disposition of foreign currencies and the difference between the amount of income accrued and the U.S. dollars actually received. Further, the effects of changes in foreign currency exchange rates on investments are not segregated on the Statement of Operations from the effects of changes in the market prices of those securities, but are included with the net realized and unrealized gain or loss on investments.
D.	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 net taxable income and net realized capital gains, if any, to its shareowners. Therefore, no provision for federal income taxes is required. As of July 31, 2023, 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 on the Statement of Operations. Tax returns filed within the prior three years remain subject to examination by federal and state tax authorities.
	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. GAAP. Distributions in excess of net investment income or net realized gains are temporary over distributions 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.

72Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

	A portion of the dividend income recorded by the Fund is from distributions by publicly traded real estate investment trusts (“REITs”), and such distributions for tax purposes may also consist of capital gains and return of capital. The actual return of capital and capital gains portions of such distributions will be determined by formal notifications from the REITs subsequent to the calendar year-end. Distributions received from the REITs that are determined to be a return of capital are recorded by the Fund as a reduction of the cost basis of the securities held and those determined to be capital gain are reflected as such on the Statement of Operations.
	At July 31, 2023, the Fund reclassified $19,648 to increase distributable earnings and $19,648 to decrease paid-in capital to reflect permanent book/tax differences. These adjustments have no impact on net assets or the results of operations.
	At July 31, 2023, the Fund was permitted to carry forward indefinitely $5,158,977 of short-term losses and $4,611,142 of long-term losses.
	The tax character of distributions paid during the years ended July 31, 2023 and July 31, 2022, was as follows:

	2023	2022
Distributions paid from:
Ordinary income	$ 7,519,615	$ 5,477,754
Long-term capital gains	5,495,135	29,890,226
Total	$13,014,750	$35,367,980

The following shows the components of distributable earnings (losses) on a federal income tax basis at July 31, 2023:

	2023
Distributable earnings/(losses):
Undistributed ordinary income	$ 862,187
Capital loss carryforward	(9,770,119)
Net unrealized appreciation	66,248,611
Total	$ 57,340,679

The difference between book-basis and tax-basis net unrealized appreciation is attributable to the tax deferral of losses on wash sales, the tax treatment of premium and amortization, the mark to market of futures contracts, and tax basis adjustments on partnership holdings.

E.	Fund Shares
	The Fund records sales and repurchases of its shares as of trade date. The Distributor earned $23,530 in underwriting commissions on the sale of Class A shares during the year ended July 31, 2023.

Pioneer Balanced ESG Fund | Annual Report | 7/31/2373

Table of Contents

F.	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 C and Class R shares of the Fund, respectively (see Note 5). Class K and Class Y shares do not pay distribution fees. All expenses and fees paid to the Fund's transfer agent 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 4).
	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 C, Class K, Class R and Class Y shares can reflect different transfer agent and distribution expense rates.
G.	Risks
	The value of securities held by the Fund may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic, political or regulatory conditions, recessions, the spread of infectious illness or other public health issues, inflation, changes in interest rates, armed conflict including Russia's military invasion of Ukraine, sanctions against Russia, other nations or individuals or companies and possible countermeasures, lack of liquidity in the bond markets or adverse investor sentiment. In the past several years, financial markets have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. These conditions may continue, recur, worsen or spread. Inflation and interest rates have increased and may rise further. These circumstances could adversely affect the value and liquidity of the Fund's investments and negatively impact the Fund's performance.
	The long-term impact of the COVID-19 pandemic and its subsequent variants on economies, markets, industries and individual issuers, are not known. Some sectors of the economy and individual issuers have experienced or may experience particularly large losses. Periods of extreme volatility in the financial markets, reduced liquidity of many instruments, increased government debt, inflation, and disruptions to supply chains, consumer demand and employee availability, may

74Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

	continue for some time. Following Russia's invasion of Ukraine, Russian securities lost all, or nearly all, their market value. Other securities or markets could be similarly affected by past or future political, geopolitical or other events or conditions.
	Governments and central banks, including the U.S. Federal Reserve, have taken extraordinary and unprecedented actions to support local and global economies and the financial markets. These actions have resulted in significant expansion of public debt, including in the U.S. The consequences of high public debt, including its future impact on the economy and securities markets, may not be known for some time.
	The U.S. and other countries are periodically involved in disputes over trade and other matters, which may result in tariffs, investment restrictions and adverse impacts on affected companies and securities. For example, the U.S. has imposed tariffs and other trade barriers on Chinese exports, has restricted sales of certain categories of goods to China, and has established barriers to investments in China. Trade disputes may adversely affect the economies of the U.S. and its trading partners, as well as companies directly or indirectly affected and financial markets generally. If the political climate between the U.S. and China does not improve or continues to deteriorate, if China were to attempt unification of Taiwan by force, or if other geopolitical conflicts develop or get worse, economies, markets and individual securities may be severely affected both regionally and globally, and the value of the Fund's assets may go down.
	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 Adviser allocates the Fund's assets between equity and debt securities based on its assessment of current business, economic and market conditions. Normally, equity and debt securities each represent 35% to 65% of the Fund's net assets. The Fund’s investments in foreign markets and countries with limited developing markets may subject the Fund to a greater degree of risk than investments in a developed market. These risks include disruptive political or economic conditions, military conflicts and sanctions, terrorism, sustained economic downturns, financial instability, less liquid trading markets, extreme price volatility, currency risks, reduction of government or central bank support, inadequate accounting standards, tariffs, tax disputes or other tax burdens, nationalization or expropriation of assets and the imposition of adverse governmental laws, arbitrary application of laws and regulations

Pioneer Balanced ESG Fund | Annual Report | 7/31/2375

Table of Contents

	or lack of rule of law and investment and repatriation restrictions. Lack of information and less market regulation also may affect the value of these securities. Withholding and other non-U.S. taxes may decrease the Fund’s return. Non-U.S. issuers may be located in parts of the world that have historically been prone to natural disasters. Investing in depositary receipts is subject to many of the same risks as investing directly in non-U.S. issuers. Depositary receipts may involve higher expenses and may trade at a discount (or premium) to the underlying security.
	Russia launched a large-scale invasion of Ukraine on February 24, 2022. In response to the military action by Russia, various countries, including the U.S., the United Kingdom, and European Union issued broad-ranging economic sanctions against Russia and Belarus and certain companies and individuals. Since then, Russian securities have lost all, or nearly all, their market value, and many other issuers, securities and markets have been adversely affected. The United States and other countries may impose sanctions on other countries, companies and individuals in light of Russia’s military invasion. The extent and duration of the military action or future escalation of such hostilities, the extent and impact of existing and future sanctions, market disruptions and volatility, and the result of any diplomatic negotiations cannot be predicted. These and any related events could have a significant impact on the value and liquidity of certain Fund investments, on Fund performance and the value of an investment in the Fund, particularly with respect to securities and commodities, such as oil, natural gas and food commodities, as well as other sectors with exposure to Russian issuers or issuers in other countries affected by the invasion, and are likely to have collateral impacts on market sectors globally.
	The Fund may invest in REIT securities, the value of which can fall for a variety of reasons, such as declines in rental income, fluctuating interest rates, poor property management, environmental liabilities, uninsured damage, increased competition, or changes in real estate tax laws.
	The Fund invests in below-investment-grade (high-yield) debt securities and preferred stocks. Some of these high-yield securities may be convertible into equity securities of the issuer. Debt securities rated below-investment-grade are commonly referred to as “junk bonds” and are considered speculative with respect to the issuer’s capacity to pay interest and repay principal. These securities involve greater risk of loss, are subject to greater price volatility, and may be less liquid and more difficult to value, especially during periods of economic uncertainty or change, than higher rated debt securities.

76Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

	The Fund’s ESG criteria exclude securities of issuers in certain industries, and the Adviser considers ESG factors in making investment decisions. Excluding specific issuers limits the universe of investments available to the Fund as compared with other funds that do not consider ESG criteria or ESG factors, which may mean forgoing some investment opportunities available to funds that do not consider ESG criteria or ESG factors. Accordingly, the Fund may underperform other funds that do not utilize an investment strategy that considers ESG criteria or ESG factors. However, the strategy of seeking to identify companies with sustainable business models is believed to provide potential return and risk benefits, including the selection of issuers with fewer ESG-related risks. In considering ESG factors, the Adviser may use third party ESG ratings information that it believes to be reliable, but such information may not be accurate or complete, or may be biased.
	The Fund's investments, payment obligations and financing terms may be based on floating rates, such as LIBOR (London Interbank Offered Rate) or SOFR (Secured Overnight Financing Rate). ICE Benchmark Administration, the administrator of LIBOR, has ceased publication of most LIBOR settings on a representative basis. Actions by regulators have resulted in the establishment of alternative reference rates to LIBOR in most major currencies. In the U.S., a common benchmark replacement is based on the SOFR published by the Federal Reserve Bank of New York, including certain spread adjustments and benchmark replacement conforming changes, although other benchmark replacements (without or without spread adjustments) may be used in certain transactions. The impact of the transition from LIBOR on the Fund's transactions and financial markets generally cannot yet be determined. The transition away from LIBOR may lead to increased volatility and illiquidity in markets for instruments that have relied on LIBOR and may adversely affect the Fund's performance.
	With the increased use of technologies such as the Internet to conduct business, the Fund is susceptible to operational, information security and related risks. While the Fund’s Adviser has established business continuity plans in the event of, and risk management systems to prevent, limit or mitigate, such cyber-attacks, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund such as the Fund’s custodian and accounting agent, and the Fund’s transfer agent. In addition, many beneficial owners of Fund shares hold them through accounts at broker-dealers, retirement platforms and other financial market participants

Pioneer Balanced ESG Fund | Annual Report | 7/31/2377

Table of Contents

	over which neither the Fund nor the Adviser exercises control. Each of these may in turn rely on service providers to them, which are also subject to the risk of cyber-attacks. Cybersecurity failures or breaches at the Adviser or the Fund’s service providers or intermediaries have the ability to cause disruptions and impact business operations, potentially resulting in financial losses, interference with the Fund’s ability to calculate its net asset value, impediments to trading, the inability of Fund shareowners to effect share purchases, redemptions or exchanges or receive distributions, loss of or unauthorized access to private shareowner information and violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, or additional compliance costs. Such costs and losses may not be covered under any insurance. In addition, maintaining vigilance against cyber-attacks may involve substantial costs over time, and system enhancements may themselves be subject to cyber-attacks.
	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.
H.	Restricted Securities
	Restricted Securities are subject to legal or contractual restrictions on resale. Restricted securities generally are resold in transactions exempt from registration under the Securities Act of 1933. Private placement securities are generally considered to be restricted except for those securities traded between qualiﬁed institutional investors under the provisions of Rule 144A of the Securities Act of 1933.
	Disposal of restricted investments may involve negotiations and expenses, and prompt sale at an acceptable price may be difﬁcult to achieve. Restricted investments held by the Fund at July 31, 2023 are listed in the Schedule of Investments.
I.	Insurance-Linked Securities (“ILS”)
	The Fund invests in ILS. The Fund could lose a portion or all of the principal it has invested in an ILS, and the right to additional interest or dividend payments with respect to the security, upon the occurrence of one or more trigger events, as deﬁned within the terms of an insurance-linked security. Trigger events, generally, are hurricanes, earthquakes, or other natural events of a speciﬁc size or magnitude that occur in a designated geographic region during a speciﬁed time period, and/or that involve losses or other metrics that exceed a speciﬁc amount. There is no way to accurately predict whether a trigger event will occur, and accordingly, ILS carry signiﬁcant risk. The Fund is entitled to receive

78Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

	principal, and interest and/or dividend payments so long as no trigger event occurs of the description and magnitude speciﬁed by the instrument. In addition to the speciﬁed trigger events, ILS may expose the Fund to other risks, including but not limited to issuer (credit) default, adverse regulatory or jurisdictional interpretations and adverse tax consequences.
	The Fund’s investments in ILS may include event-linked bonds. ILS also may include special purpose vehicles (“SPVs”) or similar instruments structured to comprise a portion of a reinsurer’s catastrophe-oriented business, known as quota share instruments (sometimes referred to as reinsurance sidecars), or to provide reinsurance relating to speciﬁc risks to insurance or reinsurance companies through a collateralized instrument, known as collateralized reinsurance. Structured reinsurance investments also may include industry loss warranties (“ILWs”). A traditional ILW takes the form of a bilateral reinsurance contract, but there are also products that take the form of derivatives, collateralized structures, or exchange-traded instruments.
	Where the ILS are based on the performance of underlying reinsurance contracts, the Fund has limited transparency into the individual underlying contracts, and therefore must rely upon the risk assessment and sound underwriting practices of the issuer. Accordingly, it may be more difficult for the Adviser to fully evaluate the underlying risk profile of the Fund's structured reinsurance investments, and therefore the Fund's assets are placed at greater risk of loss than if the Adviser had more complete information. Structured reinsurance instruments generally will be considered illiquid securities by the Fund. These securities may be difficult to purchase, sell or unwind. Illiquid securities also may be difficult to value. If the Fund is forced to sell an illiquid asset, the Fund may be forced to sell at a loss.
	Additionally, the Fund may gain exposure to ILS by investing in a closed-end interval fund, Pioneer ILS Interval Fund, an affiliate of the Adviser. The Fund’s investment in Pioneer ILS Interval Fund at July 31, 2023 is listed in the Schedule of Investments.
J.	Repurchase Agreements
	Repurchase agreements are arrangements under which the Fund purchases securities from a broker-dealer or a bank, called the counterparty, upon the agreement of the counterparty to repurchase the securities from the Fund at a later date, and at a specific price, which is typically higher than the purchase price paid by the Fund. The securities purchased serve as the Fund’s collateral for the obligation of the counterparty to repurchase the securities. The value of the collateral,

Pioneer Balanced ESG Fund | Annual Report | 7/31/2379

Table of Contents

	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 sub-custodian of the Fund. The Adviser is responsible for determining that the value of the collateral remains at least equal to the repurchase price. In the event of a default by the counterparty, the Fund is entitled to sell the securities, but the Fund may not be able to sell them for the price at which they were purchased, thus causing a loss to the Fund. Additionally, if the counterparty becomes insolvent, there is some risk that the Fund will not have a right to the securities, or the immediate right to sell the securities.
	As of and for the year ended July 31, 2023, the Fund had no open repurchase agreements.
K.	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 July 31, 2023 is recorded as "Futures collateral" on the Statement of Assets and Liabilities.
	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. Cash received from or paid to the broker related to previous margin movement is held in a segregated account at the broker and is recorded as either "Due from broker for futures" or "Due to broker for futures" on the Statement of Assets and Liabilities. 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. 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. With futures, there is reduced counterparty credit risk to the Fund since

80Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

	futures are exchange-traded and the exchange's clearinghouse, as counterparty to all exchange-traded futures, guarantees the futures against default.
	The average notional values of futures contracts long position and futures contracts short position during the year ended July 31, 2023 were $32,074,801 and $5,872,320, respectively. Open futures contracts outstanding at July 31, 2023 are listed in the Schedule of Investments.

2. Management Agreement

The Adviser manages the Fund’s portfolio. Management fees payable under the Fund’s Investment Management Agreement with the Adviser are calculated daily and paid monthly at the annual rate of 0.50% of the Fund’s average daily net assets up to $1 billion and 0.45% of the Fund’s average daily net assets over $1 billion. For the year ended July 31, 2023, the effective management fee (excluding waivers and/or assumption of expenses) was equivalent to 0.50% of the Fund’s average daily net assets.

The Adviser has agreed to waive its management fee with respect to any portion of the Fund’s assets invested in Pioneer ILS Interval Fund, an affiliated fund managed by the Adviser. For the year ended July 31, 2023, the Adviser waived $16,749 in management fees with respect to the Fund, which is reflected on the Statement of Operations as a fee waiver.

The Adviser has contractually agreed to waive and/or reimburse ordinary operating expenses (ordinary operating expenses means all fund expenses other than taxes, brokerage, acquired fund fees and expenses and extraordinary expenses, such as litigation) of the Fund to the extent required to reduce Fund expenses to 0.99%, 0.65%, 1.30% and 0.65% of the average daily net assets attributable to Class A, Class K, Class R and Class Y shares, respectively. These expense limitations are in effect through December 1, 2023. There can be no assurance that the Adviser will extend the expense limitation agreement for a class of shares beyond the date referred to above. Fees waived and expenses reimbursed during the year ended January 31, 2023 are reflected on the Statement of Operations.

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. Reflected on the Statement of Assets and Liabilities is $28,173 in management fees payable to the Adviser at July 31, 2023.

3. Compensation of Officers and Trustees

The Fund pays an annual fee to its Trustees. The Adviser reimburses the Fund for fees paid to the Interested Trustees. Except for the chief

Pioneer Balanced ESG Fund | Annual Report | 7/31/2381

Table of Contents

compliance officer, the Fund does not pay any salary or other compensation to its officers. The Fund pays a portion of the chief compliance officer's compensation for his services as the Fund's chief compliance officer. Amundi US pays the remaining portion of the chief compliance officer's compensation. For the year ended July 31, 2023, the Fund paid $20,025 in Officers' and Trustees' compensation, which is reflected on the Statement of Operations as Officers' and Trustees' fees. At July 31, 2023, on its Statement of Assets and Liabilities, the Fund had a payable for Trustees' fees of $2,009 and a payable for administrative expenses of $10,162, which includes the payable for Officers' compensation.

4. Transfer Agent

BNY Mellon Investment Servicing (US) Inc. serves as the transfer agent to the Fund at negotiated rates. Transfer agent fees and payables shown on the Statement of Operations and the Statement of Assets and Liabilities, respectively, include sub-transfer agent expenses incurred through the Fund’s omnibus relationship contracts.

In addition, the Fund reimbursed the transfer agent for out-of-pocket expenses incurred by the transfer agent related to shareowner communications activities such as proxy and statement mailings, and outgoing phone calls. For the year ended July 31, 2023, such out-of-pocket expenses by class of shares were as follows:

Shareowner Communications:
Class A	$51,661
Class C	4,622
Class K	543
Class R	833
Class Y	2,327
Total	$59,986

5. Distribution and Service Plans

The Fund has adopted a distribution plan (the “Plan”) pursuant to Rule 12b-1 of the Investment Company Act of 1940 with respect to its Class A, Class C and Class R shares. Pursuant to the Plan, the Fund pays the Distributor 0.25% of the Fund's 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 the Distributor 1.00% of the average daily net assets attributable to Class C shares. The fee for 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 C shares. Pursuant to the Plan, the Fund further pays the Distributor 0.50% of the average daily net assets

82Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

attributable to Class R shares for distribution services. Reflected on the Statement of Assets and Liabilities is $14,444 in distribution fees payable to the Distributor at July 31, 2023.

The Fund also has adopted a separate service plan for Class R shares (the “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 Class A and Class C 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. Redemptions of Class C shares within 12 months of purchase are subject to a CDSC of 1.00% based on the lower of 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 K, Class R or Class Y shares. Proceeds from the CDSCs are paid to the Distributor. For the year ended July 31, 2023, CDSCs in the amount of $4,340 were paid to the Distributor.

6. Line of Credit Facility

The Fund, along with certain other funds in the Pioneer Family of Funds, participates in a committed, unsecured revolving line of credit (“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 credit facility or the limits set for borrowing by the Fund’s prospectus and the 1940 Act. The Fund participates in a credit facility in the amount of $380 million. Under such credit facility, depending on the type of loan, interest on borrowings is payable at the Secured Overnight Financing Rate ("SOFR") plus a credit spread. The Fund also pays both an upfront fee and an annual commitment fee to participate in the credit facility. The upfront fee in the amount of 0.15% of the total credit facility and the commitment fee in the amount of 0.30% of the daily unused portion of each lender's commitment are allocated among participating funds based on an allocation schedule set forth in the credit agreement. For the year ended July 31, 2023, the Fund had no borrowings under the credit facility.

Pioneer Balanced ESG Fund | Annual Report | 7/31/2383

Table of Contents

7. Transactions in Underlying Funds

An affiliated issuer is a company in which the Fund has a direct or indirect ownership of, control of, or voting power of 5 percent or more of the outstanding voting shares, or a company which is under common ownership or control. At July 31, 2023, the value of the Fund’s investments in affiliated issuers was $1,023,698, which represents 0.2% of the Fund’s net assets.

Transactions in affiliated issuers by the Fund for the year ended July 31, 2023 were as follows:

Name of the Affiliated Issuer	Value at July 31, 2022	Purchases Costs	Change in Net Unrealized Appreciation/ (Depreciation)	Net Realized Gain/(Loss)	Dividends Received and Reinvested	Sales Proceeds	Shares held at July 31, 2023	Value at July 31, 2023
Pioneer ILS Interval Fund	$950,353	$ —	$48,899	$ —	$24,446	$ —	115,672	$1,023,698
Total	$ 950,353	$—	$48,899	$—	$24,446	$—	115,672	$ 1,023,698

Annual and semi-annual reports for the Pioneer ILS Interval Fund is available on the funds’ web page(s) at www.amundi.com/us.

84Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

8. Additional Disclosures about Derivative Instruments and Hedging Activities

The Fund’s use of derivatives may enhance or mitigate the Fund’s exposure to the following risks:

Interest rate risk relates to the ﬂuctuations in the value of interest-bearing securities due to changes in the prevailing levels of market interest rates.

Credit risk relates to the ability of the issuer of a ﬁnancial instrument to make further principal or interest payments on an obligation or commitment that it has to the Fund.

Foreign exchange rate risk relates to ﬂuctuations in the value of an asset or liability due to changes in currency exchange rates.

Equity risk relates to the ﬂuctuations in the value of ﬁnancial instruments as a result of changes in market prices (other than those arising from interest rate risk or foreign exchange rate risk), whether caused by factors speciﬁc to an individual investment, its issuer, or all factors affecting all instruments traded in a market or market segment.

Commodity risk relates to the risk that the value of a commodity or commodity index will ﬂuctuate based on increases or decreases in the commodities market and factors speciﬁc to a particular industry or commodity.

The fair value of open derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) by risk exposure at July 31, 2023, was as follows:

Statement of Assets and Liabilities	Interest Rate Risk	Credit Risk	Foreign Exchange Rate Risk	Equity Risk	Commodity Risk
Assets
Net unrealized appreciation on futures contracts*	$ 3,847	$ —	$ —	$ —	$ —
Total Value	$ 3,847	$—	$—	$—	$—
Liabilities
Net unrealized depreciation on futures contracts*	$537,955	$ —	$ —	$ —	$ —
Total Value	$537,955	$—	$—	$—	$—


*	Includes cumulative unrealized appreciation (depreciation) of futures contracts as reported in the Schedule of Investments. Only net variation margin is reported within the assets and/or liabilities on the Statement of Assets and Liabilities.

Pioneer Balanced ESG Fund | Annual Report | 7/31/2385

Table of Contents

The effect of derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) on the Statement of Operations by risk exposure at July 31, 2023 was as follows:

Statement of Operations	Interest Rate Risk	Credit Risk	Foreign Exchange Rate Risk	Equity Risk	Commodity Risk
Net Realized Gain (Loss) on
Futures contracts	$ (1,275,020)	$ —	$ —	$ —	$ —
Total Value	$(1,275,020)	$—	$—	$—	$—
Change in Net Unrealized Appreciation (Depreciation) on
Futures contracts	$ (732,907)	$ —	$ —	$ —	$ —
Total Value	$ (732,907)	$—	$—	$—	$—

86Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Report of Independent Registered Public Accounting Firm

To the Board of Trustees of Pioneer Series Trust IV and the Shareholders of Pioneer Balanced ESG Fund:

Opinion on the Financial Statements

We have audited the accompanying statement of assets and liabilities of Pioneer Balanced ESG Fund (the “Fund”) (one of the funds constituting Pioneer Series Trust IV (the “Trust”)), including the schedule of investments, as of July 31, 2023, and the related statement of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, the financial highlights for each of the five years in the period then ended and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Fund (one of the funds constituting Pioneer Series Trust IV) at July 31, 2023, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended, and its financial highlights for each of the five years in the period then ended in conformity with U.S. generally accepted accounting principles.

Basis for Opinion

These financial statements are the responsibility of the Trust’s management. Our responsibility is to express an opinion on the Fund’s financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) ("PCAOB") and are required to be independent with respect to the Trust in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Trust is not required to have, nor were we engaged to perform, an audit of the Trust’s internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting, but not for the purpose of expressing an opinion on the effectiveness of the Trust’s internal control over financial reporting. Accordingly, we express no such opinion.

Pioneer Balanced ESG Fund | Annual Report | 7/31/2387

Table of Contents

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our procedures included confirmation of securities owned as of July 31, 2023, by correspondence with the custodian, brokers and others; when replies were not received from brokers and others, we performed other auditing procedures. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

We have served as the auditor of one or more investment companies in the Pioneer family of funds since 2017.

Boston, Massachusetts
September 29, 2023

88Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Additional Information (unaudited)

For the year ended July 31, 2023, certain dividends paid by the Fund may be subject to a maximum tax rate of 20%. The Fund intends to designate up to the maximum amount of such dividends allowable, as taxed at a maximum rate of 20%. Complete information will be computed and reported in conjunction with our 2023 Form 1099-DIV.

The Fund designated $5,495,135 as long-term capital gains distributions during the year ended July 31, 2023. Distributable long-term gains are based on net realized long-term gains determined on a tax basis and may differ from such amounts for financial reporting purposes.

The qualifying percentage of the Fund’s ordinary income dividends for the purpose of the corporate dividends received deduction was 49.90%.

Qualified interest income is exempt from nonresident alien (NRA) tax withholding. The percentage of the Fund’s ordinary income distributions derived from qualified interest income was 46.29%.

Pioneer Balanced ESG Fund | Annual Report | 7/31/2389

Table of Contents

Statement Regarding Liquidity Risk Management Program

As required by law, the Fund has adopted and implemented a liquidity risk management program (the “Program”) that is designed to assess and manage liquidity risk. Liquidity risk is the risk that the Fund could not meet requests to redeem its shares without significant dilution of remaining investors’ interests in the Fund. The Fund’s Board of Trustees designated a liquidity risk management committee (the “Committee”) consisting of employees of Amundi Asset Management US, Inc. (the “Adviser”) to administer the Program.

The Committee provided the Board of Trustees with a report that addressed the operation of the Program and assessed its adequacy and effectiveness of implementation (the “Report”). The Report covered the period from January 1, 2022 through December 31, 2022 (the “Reporting Period”).

The Report confirmed that, throughout the Reporting Period, the Committee had monitored the Fund’s portfolio liquidity and liquidity risk on an ongoing basis, as described in the Program and in Board reporting throughout the Reporting Period.

The Report discussed the Committee’s annual review of the Program, which addressed, among other things, the following elements of the Program:

The Committee reviewed the Fund’s investment strategy and liquidity of portfolio investments during both normal and reasonably foreseeable stressed conditions. The Committee noted that the Fund’s investment strategy continues to be appropriate for an open-end fund, taking into account, among other things, whether and to what extent the Fund held less liquid and illiquid assets and the extent to which any such investments affected the Fund’s ability to meet redemption requests. In managing and reviewing the Fund’s liquidity risk, the Committee also considered the extent to which the Fund’s investment strategy involves a relatively concentrated portfolio or large positions in particular issuers, the extent to which the Fund uses borrowing for investment purposes, and the extent to which the Fund uses derivatives (including for hedging purposes). The Committee also reviewed the Fund’s short-term and long-term cash flow projections during both normal and reasonably foreseeable stressed conditions. In assessing the Fund’s cash flow projections, the Committee considered, among other factors, historical net redemption activity, redemption policies, ownership concentration, distribution channels, and the degree of certainty associated with the Fund’s short-term and long-term cash flow projections. The Committee also considered the Fund’s holdings of cash and cash equivalents, as well as borrowing arrangements

90Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

and other funding sources, including, if applicable, the Fund’s participation in a credit facility, as components of the Fund’s ability to meet redemption requests. The Fund has adopted an in-kind redemption policy which may be utilized to meet larger redemption requests.

The Committee reviewed the Program’s liquidity classification methodology for categorizing the Fund’s investments into one of four liquidity buckets. In reviewing the Fund’s investments, the Committee considered, among other factors, whether trading varying portions of a position in a particular portfolio investment or asset class in sizes the Fund would reasonably anticipate trading, would be reasonably expected to significantly affect liquidity.

The Committee performed an analysis to determine whether the Fund is required to maintain a Highly Liquid Investment Minimum, and determined that no such minimum is required because the Fund primarily holds highly liquid investments.

The Report stated that the Committee concluded the Program operates adequately and effectively, in all material respects, to assess and manage the Fund’s liquidity risk throughout the Reporting Period.

Pioneer Balanced ESG Fund | Annual Report | 7/31/23 91

Table of Contents

Trustees, Officers and Service Providers

Investment Adviser and Administrator
Amundi Asset Management US, Inc.

Custodian and Sub-Administrator
The Bank of New York Mellon Corporation

Independent Registered Public Accounting Firm
Ernst & Young LLP

Principal Underwriter
Amundi Distributor US, Inc.

Legal Counsel
Morgan, Lewis & Bockius LLP

Transfer Agent
BNY Mellon Investment Servicing (US) 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 www.amundi.com/us. This information is also available on the Securities and Exchange Commission’s web site at www.sec.gov.

Trustees and Officers

The Fund's Trustees and officers are listed below, together with their principal occupations and other directorships they have held during at least the past five years. Trustees who are interested persons of the Fund within the meaning of the 1940 Act are referred to as Interested Trustees. Trustees who are not interested persons of the Fund are referred to as Independent Trustees. Each of the Trustees serves as a Trustee of each of the 49 U.S. registered investment portfolios for which Amundi US serves as investment adviser (the “Pioneer Funds”). The address for all Trustees and all officers of the Fund is 60 State Street, Boston, Massachusetts 02109.

The Statement of Additional Information of the Fund includes additional information about the Directors and is available, without charge, upon request, by calling 1-800-225-6292.

92Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Independent Trustees

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Thomas J. Perna (72) Chairman of the Board and Trustee	Trustee since 2006. Serves until a successor trustee is elected or earlier retirement or removal.	Private investor (2004 – 2008 and 2013 – present); Chairman (2008 – 2013) and Chief Executive Officer (2008 – 2012), Quadriserv, Inc. (technology products for securities lending industry); and Senior Executive Vice President, The Bank of New York (financial and securities services) (1986 �� 2004)	Director, Broadridge Financial Solutions, Inc. (investor communications and securities processing provider for financial services industry) (2009 – present); Director, Quadriserv, Inc. (2005 – 2013); and Commissioner, New Jersey State Civil Service Commission (2011 – 2015)
John E. Baumgardner, Jr. (72)* Trustee	Trustee since 2019. Serves until a successor trustee is elected or earlier retirement or removal.	Of Counsel (2019 – present), Partner (1983-2018), Sullivan & Cromwell LLP (law firm).	Chairman, The Lakeville Journal Company, LLC, (privately-held community newspaper group) (2015-present)
Diane Durnin (66) Trustee	Trustee since 2019. Serves until a successor trustee is elected or earlier retirement or removal.	Managing Director - Head of Product Strategy and Development, BNY Mellon Investment Management (investment management firm) (2012-2018); Vice Chairman – The Dreyfus Corporation (2005 – 2018): Executive Vice President Head of Product, BNY Mellon Investment Management (2007-2012); Executive Director- Product Strategy, Mellon Asset Management (2005-2007); Executive Vice President Head of Products, Marketing and Client Service, Dreyfus Corporation (investment management firm) (2000-2005); Senior Vice President Strategic Product and Business Development, Dreyfus Corporation (1994-2000)	None

Pioneer Balanced ESG Fund | Annual Report | 7/31/2393

Table of Contents

Independent Trustees (continued)

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Benjamin M. Friedman (78) Trustee	Trustee since 2008. Serves until a successor trustee is elected or earlier retirement or removal.	William Joseph Maier Professor of Political Economy, Harvard University (1972 – present)	Trustee, Mellon Institutional Funds Investment Trust and Mellon Institutional Funds Master Portfolio (oversaw 17 portfolios in fund complex) (1989 - 2008)
Craig C. MacKay (60) Trustee	Trustee since 2021. Serves until a successor trustee is elected or earlier retirement or removal.	Partner, England & Company, LLC (advisory firm) (2012 – present); Group Head – Leveraged Finance Distribution, Oppenheimer & Company (investment bank) (2006 – 2012); Group Head – Private Finance & High Yield Capital Markets Origination, SunTrust Robinson Humphrey (investment bank) (2003 – 2006); and Founder and Chief Executive Officer, HNY Associates, LLC (investment bank) (1996 – 2003)	Director, Equitable Holdings, Inc. (financial services holding company) (2022 – present); Board Member of Carver Bancorp, Inc. (holding company) and Carver Federal Savings Bank, NA (2017 – present); Advisory Council Member, MasterShares ETF (2016 – 2017); Advisory Council Member, The Deal (financial market information publisher) (2015 – 2016); Board Co-Chairman and Chief Executive Officer, Danis Transportation Company (privately-owned commercial carrier) (2000 – 2003); Board Member and Chief Financial Officer, Customer Access Resources (privately-owned teleservices company) (1998 – 2000); Board Member, Federation of Protestant Welfare Agencies (human services agency) (1993 – present); and Board Treasurer, Harlem Dowling Westside Center (foster care agency) (1999 – 2018)

94Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Lorraine H. Monchak (67) Trustee	Trustee since 2017. (Advisory Trustee from 2014 - 2017). Serves until a successor trustee is elected or earlier retirement or removal.	Chief Investment Officer, 1199 SEIU Funds (healthcare workers union pension funds) (2001 – present); Vice President – International Investments Group, American International Group, Inc. (insurance company) (1993 – 2001); Vice President Corporate Finance and Treasury Group, Citibank, N.A. (1980 – 1986 and 1990 – 1993); Vice President – Asset/Liability Management Group, Federal Farm Funding Corporation (government-sponsored issuer of debt securities) (1988 – 1990); Mortgage Strategies Group, Shearson Lehman Hutton, Inc. (investment bank) (1987 – 1988); Mortgage Strategies Group, Drexel Burnham Lambert, Ltd. (investment bank) (1986 – 1987)	None
Marguerite A. Piret (75) Trustee	Trustee since 2005. Serves until a successor trustee is elected or earlier retirement or removal.	Chief Financial Officer, American Ag Energy, Inc. (technology for the environment, energy and agriculture ) (2019 – present); Chief Operating Officer, North Country Growers LLC (controlled environment agriculture company) (2020 – present); Chief Executive Officer, Green Heat LLC (biofuels company) (2022 – present); President and Chief Executive Officer, Newbury Piret Company (investment banking firm) (1981 – 2019)	Director of New America High Income Fund, Inc. (closed-end investment company) (2004 – present); and Member, Board of Governors, Investment Company Institute (2000 – 2006)

Pioneer Balanced ESG Fund | Annual Report | 7/31/2395

Table of Contents

Independent Trustees (continued)

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Fred J. Ricciardi (76) Trustee	Trustee since 2014. Serves until a successor trustee is elected or earlier retirement or removal.	Private investor (2020 – present); Consultant (investment company services) (2012 – 2020); Executive Vice President, BNY Mellon (financial and investment company services) (1969 – 2012); Director, BNY International Financing Corp. (financial services) (2002 – 2012); Director, Mellon Overseas Investment Corp. (financial services) (2009 – 2012); Director, Financial Models (technology) (2005-2007); Director, BNY Hamilton Funds, Ireland (offshore investment companies) (2004-2007); Chairman/Director, AIB/BNY Securities Services, Ltd., Ireland (financial services) (1999-2006); Chairman, BNY Alternative Investment Services, Inc. (financial services) (2005-2007)	None
* Mr. Baumgardner is Of Counsel to Sullivan & Cromwell LLP, which acts as counsel to the Independent Trustees of each Pioneer Fund.

96Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Interested Trustees

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Lisa M. Jones (61)** Trustee, President and Chief Executive Officer	Trustee since 2017. Serves until a successor trustee is elected or earlier retirement or removal	Director, CEO and President of Amundi US, Inc. (investment management firm) (since September 2014); Director, CEO and President of Amundi Asset Management US, Inc. (since September 2014); Director, CEO and President of Amundi Distributor US, Inc. (since September 2014); Director, CEO and President of Amundi Asset Management US, Inc. (since September 2014); Chair, Amundi US, Inc., Amundi Distributor US, Inc. and Amundi Asset Management US, Inc. (September 2014 – 2018); Managing Director, Morgan Stanley Investment Management (investment management firm) (2010 – 2013); Director of Institutional Business, CEO of International, Eaton Vance Management (investment management firm) (2005 – 2010); Director of Amundi Holdings US, Inc. (since 2017)	Director of Clearwater Analytics (provider of web-based investment accounting software for reporting and reconciliation services) (September 2022 – present)
Kenneth J. Taubes (65)** Trustee	Trustee since 2014. Serves until a successor trustee is elected or earlier retirement or removal	Director and Executive Vice President (since 2008) and Chief Investment Officer, U.S. (since 2010) of Amundi US, Inc. (investment management firm); Director and Executive Vice President and Chief Investment Officer, U.S. of Amundi US (since 2008); Executive Vice President and Chief Investment Officer, U.S. of Amundi Asset Management US, Inc. (since 2009); Portfolio Manager of Amundi US (since 1999); Director of Amundi Holdings US, Inc. (since 2017)	None
** Ms. Jones and Mr. Taubes are Interested Trustees because they are officers or directors of the Fund’s investment adviser and certain of its affiliates.

Pioneer Balanced ESG Fund | Annual Report | 7/31/2397

Table of Contents

Fund Officers

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Christopher J. Kelley (58) Secretary and Chief Legal Officer	Since 2005. Serves at the discretion of the Board	Vice President and Associate General Counsel of Amundi US since January 2008; Secretary and Chief Legal Officer of all of the Pioneer Funds since June 2010; Assistant Secretary of all of the Pioneer Funds from September 2003 to May 2010; Vice President and Senior Counsel of Amundi US from July 2002 to December 2007	None
Thomas Reyes (60) Assistant Secretary	Since 2010. Serves at the discretion of the Board	Assistant General Counsel of Amundi US since May 2013 and Assistant Secretary of all the Pioneer Funds since June 2010; Counsel of Amundi US from June 2007 to May 2013	None
Heather L. Melito-Dezan (46) Assistant Secretary	Since 2022. Serves at the discretion of the Board	Director - Trustee and Board Relationships of Amundi US since September 2019; Assistant Secretary of Amundi US, Inc. since July 2020: Assistant Secretary of Amundi Asset Management US, Inc. since July 2020: Assistant Secretary of Amundi Distributor US, Inc. since July 2020; Assistant Secretary of all the Pioneer Funds since September 2022; Private practice from 2017 – 2019.	None
Anthony J. Koenig, Jr. (59) Treasurer and Chief Financial and Accounting Officer	Since 2021. Serves at the discretion of the Board	Managing Director, Chief Operations Officer and Fund Treasurer of Amundi US since May 2021; Treasurer of all of the Pioneer Funds since May 2021; Assistant Treasurer of all of the Pioneer Funds from January 2021 to May 2021; and Chief of Staff, US Investment Management of Amundi US from May 2008 to January 2021	None
Luis I. Presutti (58) Assistant Treasurer	Since 2005. Serves at the discretion of the Board	Director – Fund Treasury of Amundi US since 1999; and Assistant Treasurer of all of the Pioneer Funds since 1999	None

98Pioneer Balanced ESG Fund | Annual Report | 7/31/23

Table of Contents

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Gary Sullivan (65) Assistant Treasurer	Since 2005. Serves at the discretion of the Board	Senior Manager – Fund Treasury of Amundi US since 2012; and Assistant Treasurer of all of the Pioneer Funds since 2002	None
Antonio Furtado (41) Assistant Treasurer	Since 2020. Serves at the discretion of the Board	Fund Oversight Manager – Fund Treasury of Amundi US since 2020; Assistant Treasurer of all of the Pioneer Funds since 2020; and Senior Fund Treasury Analyst from 2012 - 2020	None
Michael Melnick (52) Assistant Treasurer	Since 2021. Serves at the discretion of the Board	Vice President - Deputy Fund Treasurer of Amundi US since May 2021; Assistant Treasurer of all of the Pioneer Funds since July 2021; Director of Regulatory Reporting of Amundi US from 2001 – 2021; and Director of Tax of Amundi US from 2000 - 2001	None
John Malone (52) Chief Compliance Officer	Since 2008. Serves at the discretion of the Board	Managing Director, Chief Compliance Officer of Amundi US Asset Management; Amundi Asset Management US, Inc.; and the Pioneer Funds since September 2018; Chief Compliance Officer of Amundi Distributor US, Inc. since January 2014.	None
Brandon Austin (51) Anti-Money Laundering Officer	Since March 2022. Serves at the discretion of the Board	Director, Financial Security – Amundi Asset Management; Anti-Money Laundering Officer of all the Pioneer Funds since March 2022 Director of Financial Security of Amundi US since July 2021; Vice President, Head of BSA, AML and OFAC, Deputy Compliance Manager, Crédit Agricole Indosuez Wealth Management (investment management firm) (2013 – 2021)	None

Pioneer Balanced ESG Fund | Annual Report | 7/31/2399

Table of Contents

How to Contact Amundi

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^SMfor automated fund yields, prices,
account information and transactions

1-800-225-4321

Retirement plans information

1-800-622-0176

Write to us:

Amundi
P.O. Box 534427
Pittsburgh, PA 15253-4427

Our toll-free fax	1-800-225-4240
Our internet e-mail address	us.askamundi@amundi.com (for general questions about Amundi only)

Visit our web site: www.amundi.com/us

This report must be preceded or accompanied by a prospectus.

The Fund files a complete schedule of portfolio holdings with the Securities and Exchange Commission for the first and third quarters of each fiscal year as an exhibit to its reports on Form N-PORT. Shareholders may view the filed Form N-PORT by visiting the Commission’s web site at https://www.sec.gov.

Table of Contents

Amundi Asset Management US, Inc.
60 State Street
Boston, MA 02109

www.amundi.com/us

Securities offered through Amundi Distributor US, Inc.
60 State Street, Boston, MA 02109
Underwriter of Pioneer Mutual Funds, Member SIPC
© 2023 Amundi Asset Management US, Inc. 19418-17-0923

Pioneer Multi-Asset Income Fund

Annual Report | July 31, 2023


A: PMAIX	C: PMACX	K: PMFKX	R: PMFRX	Y: PMFYX

visit us: www.amundi.com/us

Table of Contents

President’s Letter	2
Portfolio Management Discussion	4
Portfolio Summary	15
Prices and Distributions	17
Performance Update	18
Comparing Ongoing Fund Expenses	23
Schedule of Investments	25
Financial Statements	58
Notes to Financial Statements	67
Report of Independent Registered Public Accounting Firm	89
Additional Information	91
Statement Regarding Liquidity Risk Management Program	92
Trustees, Officers and Service Providers	94

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/231

Table of Contents

President’s Letter

Dear Shareholders,

2Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

We greatly appreciate the trust you have placed in us and look forward to continuing to serve you in the future.

Lisa M. Jones
Head of the Americas, President and CEO of US
Amundi Asset Management US, Inc.
September 2023

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/233

Table of Contents

Portfolio Management Discussion | 7/31/23

In the following interview, Howard Weiss discusses Pioneer Multi-Asset Income Fund’s performance and investment strategies during the 12-month period ended July 31, 2023, along with the management team’s outlook for the coming months. Mr. Weiss, CFA, a Senior Vice President, Director of Multi-Asset Solutions, US, and a portfolio manager at Amundi Asset Management US, Inc. (Amundi US), co-manages the Fund, along with Marco Pirondini, Senior Managing Director, Head of Equities, US, and a portfolio manager at Amundi US; and Fergal Jackson, a Vice President and a portfolio manager at Amundi US.

Q	How did the Fund perform during 12-month period ended July 31, 2023?
A	The Fund’s Class A shares returned 9.19% at net asset value during the 12-month period ended July 31, 2023, while the Fund’s benchmarks, the Bloomberg US Aggregate Bond Index (the Bloomberg Index) and the Morgan Stanley Capital International Index (MSCI) All Country World NR Index (the MSCI Index)*, returned -3.37% and 12.91%, respectively. During the same period, the average return of the 393 mutual funds in Morningstar’s Global Allocation Funds category was 4.80%.
Q	How would you describe the global investment environment during the 12-month period ended July 31, 2023?
A	Amid considerable market and interest-rate volatility, equities rallied and strongly outperformed fixed-income assets. From November 2022, a few months after the beginning of the period, through January 2023, investor sentiment improved, due to signs that various central banks, including the US Federal Reserve

The MSCI information may only be used for your internal use, may not be reproduced or redisseminated in any form and may not be used as a basis for or a component of any financial instruments or products or indices. None of the MSCI information is intended to constitute investment advice or a recommendation to make (or refrain from making) any kind of investment decision and may not be relied on as such. Historical data and analysis should not be taken as an indication or guarantee of any future performance analysis, forecast or prediction. The MSCI information is provided on an “as is” basis and the user of this information assumes the entire risk of any use made of this information. MSCI, each of its affiliates and each other person involved in or related to compiling, computing or creating any MSCI information (collectively, the “MSCI Parties”) expressly disclaims all warranties (including, without limitation, any warranties of originality, accuracy, completeness, timeliness, non-infringement, merchantability and fitness for a particular purpose) , with respect to this information. Without limiting any of the foregoing, in no event shall any MSCI Party have any liability for any direct, indirect, special, incidental, punitive, consequential (including, without limitation, lost profits) or any other damages.

4Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

	(Fed), were making headway with regard to tamping down elevated levels of inflation. That, in turn, raised optimism among market participants that those central banks might slow the degree and pace of future interest-rates increases. China’s economic reopening due to an easing of its “Zero-COVID” policies also helped fuel the rally.
	In February 2023, however, market sentiment deteriorated as investors feared the Fed might raise interest rates to higher-than-anticipated levels after the release of rising inflation data in January. In addition, new concerns arose in March 2023, driven by turmoil in the banking sector. The failure of multiple US regional banks and the forced merger of a bank in Switzerland (Credit Suisse) led to worries about a potential liquidity crisis and slower economic growth. Quick actions by central banks, including the Fed, to minimize systemic risk, including shoring-up bank deposits, helped prevent contagion of those problems across the global financial system.
	Despite the stabilizing actions of central banks, concerns over the balance sheets of numerous banks in both the US and Europe revived recession fears and led to changing expectations about the future path of monetary policy, although investors remained hopeful that a continued economic slowdown might give the Fed and the European Central Bank (ECB), in particular, room to end their series of interest-rate increases. In the wake of the banking system issues, higher-growth stocks in the information technology sector began a multi-month rally that lasted for the balance of the 12-month period.
	In June 2023, the rally picked up new momentum with the Fed’s decision to pause interest-rate hikes after 10 consecutive meetings in which it had increased the federal funds rate target range. The prospect of China's enacting new stimulus measures also helped boost market sentiment, as the economic rebound after the country’s post-COVID reopening had fallen short of expectations. In Japan, monetary policy continued to diverge from those of other developed countries, with the Bank of Japan maintaining its ultra-loose policies due to concerns about slowing economic growth. That resulted in the continued weakening of the yen versus other major currencies and strong performance of Japanese equity markets, as a weaker yen has tended to lend

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/235

Table of Contents

	support to the competitiveness of domestic manufacturers in the international markets. As a result, in June 2023, the Nikkei Index reached its highest level in 30 years.
	For the 12-month period, other developed-market equities outperformed US equities on a relative basis. At the regional level, European and Japanese equities rose by 19.62% and 15.10%, respectively, for the full period, while in the US, the Standard & Poor’s 500 Index (the S&P 500) returned 13.02%. Meanwhile, emerging markets equities were positive, but lagged other regions, returning 8.35% for the 12-month period.
	Global growth stocks, led by companies in the information technology, industrials, and communication services sectors, outperformed global value stocks over the 12-month period. On the other hand, amid continued tightening of monetary policy by various central banks, global fixed-income assets lost ground for the 12-month period, delivering returns in the low-negative single digits, on average. A notable exception was the high-yield segment, as the Bloomberg Global High Yield Index returned more than 8% for the period.
Q	What factors drove the Fund’s benchmark-relative performance during the 12-month period ended July 31, 2023?
A	As a diversified** multi-asset portfolio, the Fund’s returns have generally fallen in between its fixed-income benchmark, the Bloomberg Index, and its global equity benchmark, the MSCI Index. That was indeed the case over the full 12-month period.
	During the first half of reporting period, the Fund solidly outperformed both benchmarks, with the outperformance driven by our valuation-oriented approach, in which we favored holding equities in the portfolio that we believed could perform well in an environment of higher interest rates, elevated inflation, and weaker economic data, and featuring a Fed that appeared to be moving toward maintaining a tighter monetary policy for longer than many investors had anticipated. Global value stocks significantly outperformed growth stocks during that time frame, and our security selection decisions, coupled with overweight portfolio allocations (versus the MSCI Index) to the

**	Diversification does not assure a profit nor protect against loss.

6Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

	outperforming energy and financials sectors, aided the Fund’s benchmark-relative returns.
	During the second half of the reporting period, the Fund outperformed the Bloomberg Index, but underperformed the MSCI Index. With economic and inflation data suggesting a more resilient economic picture, riskier assets, such as stocks and corporate bonds, rallied strongly during the April through July 2023 timeframe. In the US, signs of moderating inflation led to expectations that the Fed might relax its monetary policy. At the same time, recession fears eased, with many investors embracing a “soft landing” narrative, in which economic growth slows but remains positive while inflation is brought under control. Stocks gained ground in Europe, despite the ECB’s raising its key Deposit Facility rate to the highest level in over 20 years. Inflation data in the euro zone also came in better than expected for June 2023. In that “risk-on” market environment, global growth stocks outperformed value stocks. Our security selection decisions, including the Fund’s underweight exposure (versus the MSCI Index) to the outperforming information technology sector, weighed on benchmark-relative results. The Fund’s somewhat defensive positioning also was a headwind during a period of strong equity-market performance.
	For the 12-month period ended July 31, 2023, security selection results within the portfolio’s equity allocation were the largest detractors from the Fund’s benchmark-relative performance. In particular, our decision to limit the Fund’s exposure to large-cap and mega-cap information technology stocks was a headwind for relative returns, as those types of stocks soared in price, driven by heightened investor interest in potential Artificial Intelligence (AI) applications, and especially in shares of semiconductor companies, which are necessary for the development of those technological advancements. At period-end, we had retained the Fund’s underweight allocation to information technology, given what we viewed as the sector’s excessive valuations and the general lack of dividend*** payments by those companies. Conversely, our valuation-based approach pointed us toward

***	Dividends are not guaranteed.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/237

Table of Contents

	investments in companies that we believe still may offer opportunities for growth, but, in our view, at much more reasonable prices.
	At the individual security level, equity positions that aided the Fund’s benchmark-relative performance during the 12-month period included ABN AMRO, a large Dutch bank, energy giant Shell, and Cardinal Health, a health care services provider. The Fund’s investments in those companies exemplify our preference for businesses with large free-cash flows, which could enable them to increase dividends and engage in share buybacks. Positions that detracted from the Fund’s benchmark-relative returns during the period included Pfizer and CVS Health, as well as residual portfolio exposure to equity-linked debentures issued by Lumen Technologies.
	On the fixed-income side, the Fund outperformed the Bloomberg Index by a fairly wide margin during the period. Given our view that market risks had leaned more towards inflationary pressures than recessionary conditions, we reduced the portfolio’s allocation to fixed-income assets across both duration and credit-sensitive sectors early in the 12-month period. (Duration is a measure of the sensitivity of the price, or the value of principal, of a fixed-income investment to changes in interest rates expressed as a number of years.) Alternatively, we increased the Fund’s exposures to cash and to US Treasuries with one- and two-year maturities, as we felt the increased yields offered by those securities presented us with the opportunity to invest in them, in a material way, for the first time since the Fund’s inception in 2011. The strategy provided the portfolio with incremental yield during the period, as well as liquidity for the potential redeployment of assets if and when new investment opportunities arise.
	An allocation to equity-linked notes (ELNs) also made a solid positive contribution to the Fund’s benchmark-relative performance during the 12-month period. ELNs have provided, in our view, better coupon and yield profiles, with lower duration characteristics than we believed we could source from traditional fixed-income assets, such as high-yield bonds. ELNs are products that combine a fixed-income investment with the potential for additional returns tied to the performance of underlying equities,

8Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

	or equity-related securities. ELNs seek to produce yield by selling volatility against a single equity, basket of equities, or equity index. They are, in effect, covered call strategies, in which a call option – or a contractual agreement to buy a security at a predetermined price and within a predetermined timeframe – against the underlying investment is sold in an effort to produce income. (Selling volatility entails seeking relatively expensive options of highly volatile investments, with the goal of selling the options at a higher-than-average price, in anticipation that they will lose value at a faster rate than lower-cost, comparable options might decline in value.) While ELNs still bear the price risk of the referenced stock(s), periods of elevated volatility may result in ELNs offering richer coupons (yields); that, in turn, could help to mute volatility of net returns when compared to actually owning the stock shares. ELNs are subject to additional risks and, of course, there is no assurance that investments in ELNs will be profitable.
Q	Did the Fund’s monthly distributions**** to shareholders change during the 12-month period ended July 31, 2023?
A	Yes, the Fund’s monthly distribution rate modestly increased over the 12-month period, and the Fund released a year-end special distribution in December 2022. A special distribution has been paid to shareholders each year since the Fund’s inception.
	We feel the income-generation results referenced above are a testament to our flexible, “go anywhere” investment approach in managing the Fund, and multi-asset view of portfolio construction. We believe those features distinguish the Fund from many of its peers, and may potentially provide investors with an effective way to navigate complex market environments. Our message has consistently been one of prioritizing not just income, but also seeking out the best channels through which said income could be produced.

****	Distributions are not guaranteed.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/239

Table of Contents

Q	Did the Fund have exposure to derivative investments during the 12-month period ended July 31, 2023, and did the derivatives have an effect on the Fund’s benchmark performance?
A	Yes. As we discussed earlier, the Fund had exposure to ELNs, which aided benchmark-relative performance. We also purchased equity hedges, through the purchase of equity-index futures contracts, in an effort to help temper the effects of increased market volatility and sell-offs on the portfolio during the 12-month period. (Equity hedges are investments utilized to help reduce the risk of adverse price movements in a stock in which the investor already owns shares outright.)
	While the equity hedges helped backstop the Fund’s performance during times of market sell-offs, they detracted from benchmark-relative returns when US equities rallied during the 12-month period. Overall, the hedge positions produced a negative net effect on the Fund’s performance for the full reporting period, given the strong performance of US equities. We continue to believe our hedging strategy may help to mitigate the market-volatility risks associated with holding common stocks in the portfolio over the long term.
Q	What is your outlook, and how have you positioned the Fund heading into a new fiscal year?
A	Global equities, as measured by the MSCI Index, have delivered rewarding performance on a year-to-date basis from January 1, 2023 through July 31, 2023, returning more than 18%. Returns have been strong across all regions, with US (up 21%), European (up 17%), Japanese (up 16%), and emerging markets equities (up 11%) all soaring by double digits. After such strong performance in a relatively short period of time, we believe caution is warranted. Many investors have remained overly optimistic, in our view, and have been ignoring the risk of a recession as well as underestimating the potentially negative effects a slowdown in economic growth could have on corporate earnings.
	In our opinion, the risk that inflation would reaccelerate appears limited, but we believe tighter credit conditions are likely to remain in place as central banks, including the Fed, have remained focused on meeting their inflation targets. In this environment, we favor investing the portfolio in shares of

10Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

companies that we believe can continue to deliver earnings, including stocks in the financials sector. The international bank stocks held in the portfolio, many of which are companies located in Asia and Europe, have very high capital standards, in our view, and do not have relevant exposure to bond losses. Within the energy sector, which has been another strong focus for us in managing the portfolio, we continue to see a structural opportunity, as there has been underinvestment in fossel fuels across most of the globe. Within the sector, we have maintained the Fund’s exposure to natural gas companies, which we view as key to a smooth transition to more renewable fuels over time. Lastly, we believe the health care sector has offered solid income opportunities at attractive valuations. Given the more defensive nature of health care companies in general, we believe the sector could play an important role as we move through the later stages of the current economic cycle.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2311

Table of Contents

Please refer to the Schedule of Investments on pages 25 - 57 for a full listing of Fund securities.

Pioneer Multi-Asset Income (“MAI”) Fund has the ability to invest in a wide variety of securities and asset classes.

Equity-linked notes (ELNs) may not perform as expected and could cause the fund to realize significant losses including its entire principal investment. Other risks include the risk of counterparty default, liquidity risk and imperfect correlation between ELNs and the underlying securities.

High yield bonds possess greater price volatility, illiquidity, and possibility of default.

Investments in fixed income securities involve interest rate, credit, inflation, and reinvestment risks. As interest rates rise, the value of fixed income securities falls.

The Fund 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.

12Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

The Fund may invest in subordinated securities which may be disproportionately adversely affected by a default or even a perceived decline in creditworthiness of the issuer.

International investments are subject to special risks including currency fluctuations, social, economic and political uncertainties, which could increase volatility. These risks are magnified in emerging markets.

The Fund may invest in inflation-linked securities. As inflationary expectations increase, inflation-linked securities may become more attractive, because they protect future interest payments against inflation. Conversely, as inflationary concerns decrease, inflation-linked securities will become less attractive and less valuable.

The Fund may invest in insurance-linked securities (ILS). The Fund could lose a portion or all of the principal it has invested in an ILS, and the right to additional interest and/or dividend payments with respect to the security, upon the occurrence of a trigger event that leads to physical or economic loss. ILS may expose the Fund to issuer (credit) default, liquidity, and other risks.

The Fund may invest in floating rate loans. The value of collateral, if any, securing a floating rate loan can decline or may be insufficient to meet the issuer’s obligations or may be difficult to liquidate.

The Fund may invest in underlying funds, including ETFs. In addition to the Fund’s operating expenses, investors will indirectly bear the operating expenses of investments in any underlying funds.

Investments in equity securities are subject to price fluctuation.

Investments in small-and mid-cap stocks involve greater risks and volatility than large-cap stocks.

The Fund may invest in Master Limited Partnerships, which are subject to increased risks of liquidity, price valuation, control, voting rights and taxation.

The Fund may invest in zero coupon bonds and payment in kind securities, which may be more speculative and fluctuate more in value than other fixed income securities. The accrual of income from these securities are payable as taxable annual dividends to shareholders.

The Fund may use derivatives, such as options and futures, which can be illiquid, may disproportionately increase losses, and have a potentially large impact on performance.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2313

Table of Contents

The Fund may invest in credit default swaps, a type of derivative, which may in some cases be illiquid, and increases credit risk since the Fund has exposure to both the issuer of the referenced obligation and the counterparty to the credit default swap.

The Fund and some of the underlying funds may employ leverage, which increases the volatility of investment returns and subjects the Fund to magnified losses if the Fund's or the underlying funds' investments decline in value.

There is no assurance that these and other strategies used by the Fund or underlying funds will be successful. Please see the prospectus for a more complete discussion of the Fund’s risks.

14Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Portfolio Summary | 7/31/23

Portfolio Diversification

(As a percentage of total investments)*

Sector Distribution

(As a percentage of total investments)*

+ Amount rounds to less than 0.1%.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2315

Table of Contents

Portfolio Summary | 7/31/23 (continued)

10 Largest Holdings

(As a percentage of total investments)*
1.	Energy Transfer LP	3.34%
2.	Shell Plc, (A.D.R.)	3.31
3.	Pfizer, Inc.	3.07
4.	ABN AMRO Bank NV, (C.V.A.) (144A)	2.92
5.	U.S. Treasury Notes, 3.00%, 6/30/24	2.36
6.	International Business Machines Corp.	2.09
7.	KB Financial Group, Inc.	2.03
8.	Sanofi	1.94
9.	State Street Corp.	1.89
10.	Level 3 Financing, Inc., 10.50%, 5/15/30 (144A)	1.70


*	Excludes short-term investments and all derivative contracts except for options purchased. The Fund is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any securities.

16Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Prices and Distributions | 7/31/23

Net Asset Value per Share

Class	7/31/23	7/31/22
A	$11.32	$10.98
C	$11.28	$10.94
K	$11.64	$11.28
R	$11.32	$10.98
Y	$11.28	$10.94

Distributions per Share: 8/1/22 - 7/31/23

Class	Net Investment Income	Short-Term Capital Gains	Long-Term Capital Gains
A	$0.6331	$—	$—
C	$0.5474	$—	$—
K	$0.6813	$—	$—
R	$0.5977	$—	$—
Y	$0.6530	$—	$—

Index Definitions

The Bloomberg US Aggregate Bond Index is an unmanaged measure of the US bond market. The MSCI All Country World NR Index is an unmanaged, free float-adjusted, market capitalization-weighted index that is designed to measure the equity market performance of developed and emerging markets. The Index consists of 45 country indices comprising 24 developed and 21 emerging market country indices. Indices are unmanaged and their returns assume reinvestment of dividends and do not reflect any fees or expenses. It is not possible to invest directly in an index.

The indices defined here pertain to the “Value of $10,000 Investment” and “Value of $5 Million Investment” charts on pages 18 – 22.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2317

Table of Contents

Performance Update | 7/31/23

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 Multi-Asset Income Fund at public offering price during the periods shown, compared to that of the Bloomberg US Aggregate Bond Index and the MSCI All Country World NR Index.

Average Annual Total Returns (As of July 31, 2023)
Period	Net Asset Value (NAV)	Public Offering Price (POP)	Bloomberg US Aggregate Bond Index	MSCI All Country World NR Index
10 Years	6.04%	5.56%	1.50%	8.64%
5 Years	5.31	4.33	0.75	8.24
1 Year	9.19	4.25	-3.37	12.91

Expense Ratio
(Per prospectus dated December 1, 2022)

Gross

0.86%

Value of $10,000 Investment

Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.

NAV results represent the percent change in net asset value per share. NAV 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.

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.

Please see the financial highlights for a more current expense ratio.

18Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Performance Update | 7/31/23

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 Multi-Asset Income Fund during the periods shown, compared to that of the Bloomberg US Aggregate Bond Index and the MSCI All Country World NR Index.

Average Annual Total Returns (As of July 31, 2023)
Period	If Held	If Redeemed	Bloomberg US Aggregate Bond Index	MSCI All Country World NR Index
10 Years	5.20%	5.20%	1.50%	8.64%
5 Years	4.48	4.48	0.75	8.24
1 Year	8.38	7.38	-3.37	12.91

Expense Ratio
(Per prospectus dated December 1, 2022)

Gross

1.62%

Value of $10,000 Investment

Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.

Class C shares held for less than one year are also subject to a 1% contingent deferred sales charge (CDSC). “If Held” results represent the percent change in net asset value per share. “If Redeemed” returns reflect deduction of the CDSC for the one-year period, assuming a complete redemption of shares at the last price calculated on the last business day of the period, and no CDSC for the five- and 10-year periods. 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.

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.

Please see the financial highlights for a more current expense ratio.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2319

Table of Contents

Performance Update | 7/31/23

Class K Shares

Investment Returns

The mountain chart on the right shows the change in value of a $5 million investment made in Class K shares of Pioneer Multi-Asset Income Fund during the periods shown, compared to that of the Bloomberg US Aggregate Bond Index and the MSCI All Country World NR Index.

Average Annual Total Returns (As of July 31, 2023)
Period	Net Asset Value (NAV)	Bloomberg US Aggregate Bond Index	MSCI All Country World NR Index
10 Years	6.58%	1.50%	8.64%
5 Years	5.54	0.75	8.24
1 Year	9.58	-3.37	12.91

Expense Ratio
(Per prospectus dated December 1, 2022)

Gross

0.56%

Value of $5 Million Investment

Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.

The performance shown for Class K shares for the period prior to the commencement of operations of Class K shares on December 1, 2014, 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 on December 1, 2014, would have been higher than the performance shown. For the period beginning December 1, 2014, 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. 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.

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.

Please see the financial highlights for a more current expense ratio.

20Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Performance Update | 7/31/23

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 Multi-Asset Income Fund during the periods shown, compared to that of the Bloomberg US Aggregate Bond Index and the MSCI All Country World NR Index.

Average Annual Total Returns (As of July 31, 2023)
Period	Net Asset Value (NAV)	Bloomberg US Aggregate Bond Index	MSCI All Country World NR Index
10 Years	5.57%	1.50%	8.64%
5 Years	4.62	0.75	8.24
1 Year	8.84	-3.37	12.91

Expense Ratio
(Per prospectus dated December 1, 2022)

Gross

1.19%

Value of $10,000 Investment

Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.

The performance shown for Class R shares for the period prior to the commencement of operations of Class R shares on December 1, 2014, 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 beginning December 1, 2014, the actual performance of Class R shares is reflected. 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.

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.

Please see the financial highlights for a more current expense ratio.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2321

Table of Contents

Performance Update | 7/31/23

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 Multi-Asset Income Fund during the periods shown, compared to that of the Bloomberg US Aggregate Bond Index and the MSCI All Country World NR Index.

Average Annual Total Returns (As of July 31, 2023)
Period	Net Asset Value (NAV)	Bloomberg US Aggregate Bond Index	MSCI All Country World NR Index
10 Years	6.23%	1.50%	8.64%
5 Years	5.47	0.75	8.24
1 Year	9.42	-3.37	12.91

Expense Ratio (Per prospectus dated December 1, 2022)
Gross	Net
0.67%	0.66%

Value of $5 Million Investment

Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.

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.

Please see the financial highlights for more current expense ratios.

22Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

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.

Using the Tables

Actual Expenses

(1)	Divide your account value by $1,000 Example: an $8,600 account value ÷ $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 Multi-Asset Income Fund

Based on actual returns from February 1, 2023 through July 31, 2023.

Share Class	A	C	K	R	Y
Beginning Account Value on 2/1/23	$1,000.00	$1,000.00	$1,000.00	$1,000.00	$1,000.00
Ending Account Value (after expenses) on 7/31/23	$1,009.40	$1,006.30	$1,011.30	$1,008.60	$1,011.20
Expenses Paid During Period*	$4.23	$8.06	$2.79	$5.98	$3.24


*	Expenses are equal to the Fund’s annualized expense ratio of 0.85%, 1.62%, 0.56%, 1.20%, and 0.65% for Class A, Class C, Class K, Class R, and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 181/365 (to reﬂect the one-half year period).

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2323

Table of Contents

Comparing Ongoing Fund Expenses (continued)

Hypothetical Example for Comparison Purposes

Expenses Paid on a $1,000 Investment in Pioneer Multi-Asset Income Fund

Based on a hypothetical 5% return per year before expenses, reflecting the period from February 1, 2023 through July 31, 2023.

Share Class	A	C	K	R	Y
Beginning Account Value on 2/1/23	$1,000.00	$1,000.00	$1,000.00	$1,000.00	$1,000.00
Ending Account Value (after expenses) on 7/31/23	$1,020.58	$1,016.76	$1,022.02	$1,018.84	$1,021.57
Expenses Paid During Period*	$4.26	$8.10	$2.81	$6.01	$3.26


*	Expenses are equal to the Fund’s annualized expense ratio of 0.85%, 1.62%, 0.56%, 1.20%, and 0.65% for Class A, Class C, Class K, Class R, and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 181/365 (to reﬂect the one-half year period).

24Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Schedule of Investments | 7/31/23

Principal Amount USD ($)		Value
	UNAFFILIATED ISSUERS — 98.1%
	Senior Secured Floating Rate Loan Interests — 0.8% of Net Assets*(a)
	Advanced Materials — 0.0%†
980,000	Groupe Solmax, Inc., Initial Term Loan, 10.253% (Term SOFR + 475 bps), 5/29/28	$ 930,847
	Total Advanced Materials	$930,847


	Advertising Sales — 0.1%
1,954,315	Clear Channel Outdoor Holdings, Inc., Term B Loan, 8.933% (Term SOFR + 350 bps), 8/21/26	$ 1,897,313
	Total Advertising Sales	$1,897,313


	Aerospace & Defense — 0.0%†
887,500	ADS Tactical, Inc., Initial Term Loan, 11.183% (Term SOFR + 575 bps), 3/19/26	$ 856,438
	Total Aerospace & Defense	$856,438


	Auto Parts & Equipment — 0.0%†
977,500	First Brands Group LLC, First Lien 2021 Term Loan, 10.881% (Term SOFR + 500 bps), 3/30/27	$ 970,169
	Total Auto Parts & Equipment	$970,169


	Building & Construction Products — 0.0%†
977,959	CP Atlas Buyer, Inc., Term B Loan, 9.169% (Term SOFR + 375 bps), 11/23/27	$ 930,283
	Total Building & Construction Products	$930,283


	Building-Maintenance & Service — 0.0%†
491,250	ArchKey Holdings, Inc., First Lien Initial Term Loan, 10.788% (Term SOFR + 525 bps), 6/29/28	$ 489,817
	Total Building-Maintenance & Service	$489,817


	Casino Services — 0.0%†
237,500(b)	Lucky Bucks LLC, Initial Term Loan, 10.933% (LIBOR + 750 bps), 7/30/27	$ 75,703
5,928	Lucky Bucks LLC, New Money OpCo DIP Loan, 15.148% (Term SOFR + 1000 bps), 10/8/23	5,928
	Total Casino Services	$81,631


	Chemicals-Specialty — 0.1%
869,358	CPC Acquisition Corp., First Lien Initial Term Loan, 9.253% (Term SOFR + 375 bps), 12/29/27	$ 688,423
980,000	Mativ Holdings, Inc., Term B Loan, 9.183% (Term SOFR + 375 bps), 4/20/28	953,050
	Total Chemicals-Specialty	$1,641,473

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2325

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Commercial Services — 0.0%†
553,198	CoreLogic, Inc. (fka First American Corporation), First Lien Initial Term Loan, 8.933% (Term SOFR + 350 bps), 6/2/28	$ 511,131
	Total Commercial Services	$511,131


	Diagnostic Equipment — 0.0%†
490,000	Curia Global, Inc., First Lien 2021 Term Loan, 9.169% (Term SOFR + 375 bps), 8/30/26	$ 427,831
	Total Diagnostic Equipment	$427,831


	Dialysis Centers — 0.0%†
977,152	US Renal Care, Inc., Initial Term Loan, 10.433% (LIBOR + 500 bps), 6/26/26	$ 493,462
	Total Dialysis Centers	$493,462


	Distribution & Wholesale — 0.1%
1,953,608	Patriot Container Corp. (aka Wastequip), First Lien Closing Date Term Loan, 9.169% (Term SOFR + 375 bps), 3/20/25	$ 1,851,288
980,000	SRS Distribution, Inc., 2021 Reﬁnancing Term Loan, 8.933% (Term SOFR + 350 bps), 6/2/28	968,914
	Total Distribution & Wholesale	$2,820,202


	Electric-Generation — 0.0%†
358,422	Eastern Power LLC (Eastern Covert Midco LLC), Term Loan, 9.183% (Term SOFR + 375 bps), 10/2/25	$ 345,355
	Total Electric-Generation	$345,355


	Electronic Composition — 0.0%†
978,891	Energy Acquisition LP, First Lien Initial Term Loan, 9.614% (Term SOFR + 425 bps), 6/26/25	$ 926,072
	Total Electronic Composition	$926,072


	Enterprise Software & Services — 0.1%
1,473,750	Polaris Newco LLC, First Lien Dollar Term Loan, 9.538% (Term SOFR + 400 bps), 6/2/28	$ 1,395,342
	Total Enterprise Software & Services	$1,395,342


	Investment Management & Advisory Services — 0.1%
1,464,150	Russell Investments US Institutional Holdco, Inc., 2025 Term Loan, 8.919% (Term SOFR + 350 bps), 5/30/25	$ 1,355,384
	Total Investment Management & Advisory Services	$1,355,384

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

26Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Machinery — 0.0%†
985,000	Engineered Components & Systems LLC, First Lien Initial Term Loan, 11.369% (Term SOFR + 600 bps), 8/2/28	$ 966,531
	Total Machinery	$966,531


	Medical-Biomedical & Generation — 0.1%
1,231,250	ANI Pharmaceuticals, Inc., Initial Term Loan, 11.433% (Term SOFR + 600 bps), 11/19/27	$ 1,232,789
	Total Medical-Biomedical & Generation	$1,232,789


	Medical-Drugs — 0.1%
977,157	Curium BidCo S.a.r.l., Facility B, 9.538% (LIBOR + 400 bps), 7/9/26	$ 978,379
	Total Medical-Drugs	$978,379


	Protection-Safety — 0.0%†
491,250	APX Group, Inc., Initial Term Loan, 10.75% (Term SOFR + 325 bps), 7/10/28	$ 491,352
	Total Protection-Safety	$491,352


	Retail — 0.1%
656,326	Staples, Inc., 2019 Refinancing New Term B-2 Loan, 9.799% (LIBOR + 450 bps), 9/12/24	$ 649,435
456,250	Torrid LLC, Closing Date Term Loan, 11.003% (Term SOFR + 550 bps), 6/14/28	388,953
	Total Retail	$1,038,388


	Theaters — 0.0%†
488,520	AMC Entertainment Holdings, Inc. (fka AMC Entertainment, Inc.), Term B-1 Loan, 8.202% (Term SOFR + 300 bps), 4/22/26	$ 382,512
	Total Theaters	$382,512


	Total Senior Secured Floating Rate Loan Interests (Cost $22,728,701)	$21,162,701

Shares
	Common Stocks — 49.6% of Net Assets
	Aerospace & Defense — 1.0%
761,108	Hensoldt AG	$ 25,875,039
	Total Aerospace & Defense	$25,875,039

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2327

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Shares		Value
	Air Freight & Logistics — 0.8%
349,283	Cia de Distribucion Integral Logista Holdings S.A.	$ 9,723,808
60,278	United Parcel Service, Inc., Class B	11,279,822
	Total Air Freight & Logistics	$21,003,630


	Automobile Components — 0.4%
255,600	Bridgestone Corp.	$ 10,587,641
	Total Automobile Components	$10,587,641


	Automobiles — 0.8%
1,060,600	Subaru Corp.	$ 20,028,130
	Total Automobiles	$20,028,130


	Banks — 9.5%
4,298,865	ABN AMRO Bank NV (C.V.A.) (144A)	$ 73,073,268
363,983	Citizens Financial Group, Inc.	11,742,092
899,318	FinecoBank Banca Fineco S.p.A.	13,956,914
1,368,040	Grupo Financiero Banorte S.A.B de CV, Class O	12,966,356
693,810	Hana Financial Group, Inc.	21,391,545
5,747,079	Intesa Sanpaolo S.p.A.	16,612,423
1,271,241	KB Financial Group, Inc.	50,863,602
166,500	Sumitomo Mitsui Trust Holdings, Inc.	6,468,531
666,369	Truist Financial Corp.	22,136,778
591,317	UniCredit S.p.A.	14,953,520
	Total Banks	$244,165,029


	Broadline Retail — 0.2%
111,662	eBay, Inc.	$ 4,970,076
	Total Broadline Retail	$4,970,076


	Capital Markets — 5.3%
511,334	Bank of New York Mellon Corp.	$ 23,194,110
142,584	Brightsphere Investment Group, Inc.	3,034,187
287,257	Euronext NV (144A)	21,871,856
651,693	State Street Corp.	47,208,641
1,800,711	UBS Group AG	39,801,278
	Total Capital Markets	$135,110,072


	Chemicals — 0.0%†
1,752,813	Chevron Lubricants Lanka Plc	$ 507,278
	Total Chemicals	$507,278


	Communications Equipment — 1.0%
460,393	Cisco Systems, Inc.	$ 23,958,852
201,639	Telefonaktiebolaget LM Ericsson, Class B	1,013,137
	Total Communications Equipment	$24,971,989

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

28Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Shares		Value
	Construction Materials — 0.9%
366,435	CRH Plc (A.D.R.)	$ 22,096,031
	Total Construction Materials	$22,096,031


	Consumer Staples Distribution & Retail — 0.0%†
195,032 +#	Magnit PJSC	$ 618,044
48,325(c) +#	X5 Retail Group NV (G.D.R.)	29,164
	Total Consumer Staples Distribution & Retail	$647,208


	Diversified Telecommunication Services — 0.6%
689,905	Deutsche Telekom AG	$ 15,051,160
	Total Diversified Telecommunication Services	$15,051,160


	Electric Utilities — 0.5%
297,785	FirstEnergy Corp.	$ 11,729,751
	Total Electric Utilities	$11,729,751


	Electrical Equipment — 0.6%
1,015,200	Mitsubishi Electric Corp.	$ 14,635,892
	Total Electrical Equipment	$14,635,892


	Food Products — 0.2%
182,872	Associated British Foods Plc	$ 4,811,120
	Total Food Products	$4,811,120


	Health Care Equipment & Supplies — 0.7%
226,186(c)	Koninklijke Philips NV	$ 4,702,259
162,095	Medtronic Plc	14,225,457
	Total Health Care Equipment & Supplies	$18,927,716


	Health Care Providers & Services — 2.5%
424,588	Cardinal Health, Inc.	$ 38,837,064
82,871	Cigna Group	24,455,232
	Total Health Care Providers & Services	$63,292,296


	Household Durables — 1.4%
224,027	Ariston Holding NV	$ 2,085,079
723,000	Panasonic Holdings Corp.	8,944,435
1,766,314	Persimmon Plc	26,272,201
	Total Household Durables	$37,301,715


	Household Products — 0.2%
60,037	Reckitt Benckiser Group Plc	$ 4,498,091
	Total Household Products	$4,498,091


	Insurance — 0.8%
93,591	Hartford Financial Services Group, Inc.	$ 6,727,321
34,799	NN Group NV	1,334,561
13,025	Old Republic International Corp.	359,099
144,800	Power Corp. of Canada	4,102,475

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2329

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Shares		Value
	Insurance — (continued)
20,252	Willis Towers Watson Plc	$ 4,279,855
7,547	Zurich Insurance Group AG	3,641,738
	Total Insurance	$20,445,049


	IT Services — 2.0%
362,577	International Business Machines Corp.	$ 52,276,352
	Total IT Services	$52,276,352


	Leisure Products — 0.1%
5,134,000	Honma Golf, Ltd. (144A)	$ 2,185,549
	Total Leisure Products	$2,185,549


	Metals & Mining — 0.7%
30,112	Rio Tinto Plc	$ 1,990,178
317,806	Royal Bafokeng Platinum, Ltd.	2,274,467
294,447	Teck Resources, Ltd., Class B	13,082,280
	Total Metals & Mining	$17,346,925


	Mortgage Real Estate Investment Trusts (REITs) — 1.3%
730,230	AGNC Investment Corp.	$ 7,441,044
297,120	Angel Oak Mortgage, Inc.	2,816,698
52,118	Great Ajax Corp.	359,614
528,740	Ladder Capital Corp.	5,810,852
906,673	Rithm Capital Corp.	9,139,264
609,873	Two Harbors Investment Corp.	8,178,397
	Total Mortgage Real Estate Investment Trusts (REITs)	$33,745,869


	Office REITs — 0.1%
14,864	Alexandria Real Estate Equities, Inc.	$ 1,868,108
	Total Office REITs	$1,868,108


	Oil, Gas & Consumable Fuels — 11.7%
112,859(c)	Antero Resources Corp.	$ 3,018,978
1,250,961	BW LPG, Ltd. (144A)	13,392,067
18,609	Cheniere Energy Partners LP	961,155
64,310	Chesapeake Energy Corp.	5,423,905
229,945	Comstock Resources, Inc.	2,931,799
14,236	ConocoPhillips	1,675,862
195,838	Coterra Energy, Inc.	5,393,379
6,292,270	Energy Transfer LP	83,624,268
18,493	Enterprise Products Partners LP	490,249
63,050	EQT Corp.	2,659,449
200,600	Inpex Corp.	2,583,907
400,877(c)	Kosmos Energy, Ltd.	2,846,227
47,954 +#	LUKOIL PJSC	155,622

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

30Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Shares		Value
	Oil, Gas & Consumable Fuels — (continued)
119,488	Marathon Oil Corp.	$ 3,138,950
814,362	MPLX LP	28,917,995
43,240	Murphy Oil Corp.	1,870,995
225,476	Occidental Petroleum Corp.	14,234,300
183,303	Ovintiv, Inc.	8,448,435
577,075	Permian Resources Corp.	6,746,007
194,305	Plains All American Pipeline LP	2,891,258
664,211	Range Resources Corp.	20,876,152
1,271,403 +#	Rosneft Oil Co. PJSC	353,360
1,342,345	Shell Plc, (A.D.R.)	82,728,722
117,051(c)	Southwestern Energy Co.	758,490
244,341(c)	Talos Energy, Inc.	3,909,456
	Total Oil, Gas & Consumable Fuels	$300,030,987


	Pharmaceuticals — 5.2%
360,817	Organon & Co.	$ 7,930,758
2,130,894	Pfizer, Inc.	76,840,037
453,666	Sanofi	48,429,052
	Total Pharmaceuticals	$133,199,847


	Semiconductors & Semiconductor Equipment — 0.1%
27,077	MKS Instruments, Inc.	$ 2,955,996
	Total Semiconductors & Semiconductor Equipment	$2,955,996


	Technology Hardware, Storage & Peripherals — 0.5%
339,000	Asustek Computer, Inc.	$ 3,926,495
614,000	Catcher Technology Co., Ltd.	3,389,783
339,317	Hewlett Packard Enterprise Co.	5,897,329
	Total Technology Hardware, Storage & Peripherals	$13,213,607


	Textiles, Apparel & Luxury Goods — 0.4%
218,847	Tapestry, Inc.	$ 9,443,248
	Total Textiles, Apparel & Luxury Goods	$9,443,248


	Trading Companies & Distributors — 0.1%
38,048(c)	AerCap Holdings NV	$ 2,427,843
52,100	Inaba Denki Sangyo Co., Ltd.	1,155,418
	Total Trading Companies & Distributors	$3,583,261


	Total Common Stocks (Cost $1,143,718,390)	$1,270,504,662

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2331

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Asset Backed Securities — 2.7% of Net Assets
2,000,000	ACC Auto Trust, Series 2022-A, Class D, 10.07%, 3/15/29 (144A)	$ 1,923,626
3,000,000	ACM Auto Trust, Series 2022-1A, Class D, 8.58%, 4/20/29 (144A)	2,979,537
1,150,000	American Credit Acceptance Receivables Trust, Series 2021-3, Class F, 3.64%, 5/15/28 (144A)	1,060,626
575,000	AMSR Trust, Series 2020-SFR2, Class G, 4.00%, 7/17/37 (144A)	532,241
2,500,000	Avid Automobile Receivables Trust, Series 2023-1, Class C, 7.35%, 12/15/27 (144A)	2,495,286
1,214,203(d)	Blackbird Capital Aircraft Lease Securitization, Ltd., Series 2016-1A, Class B, 5.682%, 12/16/41 (144A)	862,120
3,200,000(a)	CAL Receivables LLC, Series 2022-1, Class B, 9.418% (SOFR30A + 435 bps), 10/15/26 (144A)	3,140,779
4,000,000	CarNow Auto Receivables Trust, Series 2023-1A, Class D, 7.99%, 2/15/28 (144A)	3,925,363
1,400,000	Cartiga Asset Finance Trust LLC, Series 2023-1, Class C, 10.00%, 3/15/35 (144A)	1,308,496
852,000	Crossroads Asset Trust, Series 2021-A, Class E, 5.48%, 1/20/28 (144A)	816,934
4,517,000(e)	Finance of America HECM Buyout, Series 2022-HB1, Class M5, 7.87%, 2/25/32 (144A)	3,765,437
700,000(a)	GRACIE POINT INTERNATIONAL FUNDING, Series 2022-1A, Class E, 10.815% (SOFR30A + 575 bps), 4/1/24 (144A)	698,081
2,400,000	JPMorgan Chase Bank NA - CACLN, Series 2021-2, Class G, 8.482%, 12/26/28 (144A)	2,248,894
2,850,682	Libra Solutions LLC, Series 2023-1A, Class B, 10.25%, 2/15/35 (144A)	2,847,831
2,000,000	LL ABS Trust, Series 2022-1A, Class D, 7.83%, 11/15/29 (144A)	1,839,154
3,000,000	Mercury Financial Credit Card Master Trust, Series 2022-2A, Class C, 10.83%, 3/22/27 (144A)	2,932,733
3,500,000	Mercury Financial Credit Card Master Trust, Series 2023-1A, Class A, 8.04%, 9/20/27 (144A)	3,521,260
1,664,000	Octane Receivables Trust 2022-1, Series 2022-1A, Class E, 7.33%, 12/20/29 (144A)	1,573,346
2,000,000	PEAR LLC, Series 2023-1, Class C, 10.00%, 7/15/35 (144A)	1,892,132
500,000	Rosy Blue Carat SCS, Series 2018-1, Class A1R, 8.481%, 3/15/30 (144A)	508,800
3,570,000	Santander Bank Auto Credit-Linked Notes, Series 2022-A, Class D, 9.965%, 5/15/32 (144A)	3,445,334

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

32Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Asset Backed Securities — (continued)
1,200,000	Santander Bank Auto Credit-Linked Notes, Series 2022-A, Class E, 12.662%, 5/15/32 (144A)	$ 1,103,135
3,500,000	Santander Bank Auto Credit-Linked Notes, Series 2022-B, Class F, 11.91%, 8/16/32 (144A)	3,399,689
5,100,000	Santander Bank N.A. - SBCLN, Series 2021-1A, Class E, 6.171%, 12/15/31 (144A)	4,292,340
4,500,000	SCF Equipment Leasing LLC, Series 2022-1A, Class F, 6.00%, 7/20/32 (144A)	3,880,886
1,338,000	SCF Equipment Leasing LLC, Series 2022-2A, Class E, 6.50%, 6/20/35 (144A)	1,156,678
800,000(a)	STAR, Series 2021-SFR1, Class H, 9.786% (1 Month Term SOFR + 456 bps), 4/17/38 (144A)	758,197
2,500,000	Tricolor Auto Securitization Trust, Series 2022-1A, Class F, 9.80%, 7/16/29 (144A)	2,398,755
5,000,000	Tricolor Auto Securitization Trust, Series 2023-1A, Class E, 13.45%, 6/15/28 (144A)	5,151,258
2,150,824	Westgate Resorts LLC, Series 2023-1A, Class D, 10.14%, 12/20/37 (144A)	2,138,028
	Total Asset Backed Securities (Cost $71,014,971)	$68,596,976


	Collateralized Mortgage Obligations—3.3% of Net Assets
290,000(a)	Bellemeade Re, Ltd., Series 2020-3A, Class B1, 11.762% (1 Month USD LIBOR + 635 bps), 10/25/30 (144A)	$ 301,311
2,100,000(a)	Bellemeade Re, Ltd., Series 2020-3A, Class M2, 10.262% (1 Month USD LIBOR + 485 bps), 10/25/30 (144A)	2,191,304
2,400,000(a)	Bellemeade Re, Ltd., Series 2022-1, Class B1, 10.569% (SOFR30A + 550 bps), 1/26/32 (144A)	2,330,813
1,250,000(e)	CFMT LLC, Series 2021-HB5, Class M4, 5.683%, 2/25/31 (144A)	1,147,013
4,350,000(e)	CFMT LLC, Series 2023-HB12, Class M2, 4.25%, 4/25/33 (144A)	3,707,646
1,600,000(e)	CFMT LLC, Series 2023-HB12, Class M3, 4.25%, 4/25/33 (144A)	1,267,329
2,860,000(a)	Connecticut Avenue Securities Trust, Series 2021-R01, Class 1B2, 11.069% (SOFR30A + 600 bps), 10/25/41 (144A)	2,888,285
2,660,000(a)	Connecticut Avenue Securities Trust, Series 2022-R01, Class 1B2, 11.069% (SOFR30A + 600 bps), 12/25/41 (144A)	2,669,941
2,900,000(a)	Eagle RE, Ltd., Series 2021-1, Class M2, 9.519% (SOFR30A + 445 bps), 10/25/33 (144A)	2,977,708

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2333

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Collateralized Mortgage Obligations—(continued)
970,000(a)	Fannie Mae Connecticut Avenue Securities, Series 2021-R02, Class 2B2, 11.269% (SOFR30A + 620 bps), 11/25/41 (144A)	$ 974,346
1,059,469(a)	Freddie Mac STACR REMIC Trust, Series 2020-DNA3, Class B1, 10.283% (SOFR30A + 521 bps), 6/25/50 (144A)	1,138,929
1,100,000(a)	Freddie Mac STACR REMIC Trust, Series 2020-DNA3, Class B2, 14.533% (SOFR30A + 946 bps), 6/25/50 (144A)	1,380,603
1,065,000(a)	Freddie Mac STACR REMIC Trust, Series 2020-DNA5, Class B1, 9.869% (SOFR30A + 480 bps), 10/25/50 (144A)	1,150,856
850,000(a)	Freddie Mac STACR REMIC Trust, Series 2020-DNA6, Class B1, 8.069% (SOFR30A + 300 bps), 12/25/50 (144A)	841,500
2,675,000(a)	Freddie Mac STACR REMIC Trust, Series 2020-DNA6, Class B2, 10.719% (SOFR30A + 565 bps), 12/25/50 (144A)	2,730,004
2,765,000(a)	Freddie Mac STACR REMIC Trust, Series 2021-DNA1, Class B2, 9.819% (SOFR30A + 475 bps), 1/25/51 (144A)	2,664,796
2,170,000(a)	Freddie Mac STACR REMIC Trust, Series 2021-DNA3, Class B2, 11.319% (SOFR30A + 625 bps), 10/25/33 (144A)	2,231,689
3,530,000(a)	Freddie Mac STACR REMIC Trust, Series 2021-DNA5, Class B2, 10.569% (SOFR30A + 550 bps), 1/25/34 (144A)	3,268,081
3,480,000(a)	Freddie Mac STACR REMIC Trust, Series 2021-DNA7, Class B2, 12.869% (SOFR30A + 780 bps), 11/25/41 (144A)	3,610,491
2,910,000(a)	Freddie Mac STACR REMIC Trust, Series 2021-HQA1, Class B2, 10.069% (SOFR30A + 500 bps), 8/25/33 (144A)	2,801,990
1,970,000(a)	Freddie Mac STACR REMIC Trust, Series 2021-HQA3, Class B2, 11.319% (SOFR30A + 625 bps), 9/25/41 (144A)	1,922,301
3,450,000(a)	Freddie Mac STACR REMIC Trust, Series 2022-DNA1, Class B2, 12.169% (SOFR30A + 710 bps), 1/25/42 (144A)	3,511,855
2,650,000(a)	Freddie Mac STACR REMIC Trust, Series 2022-DNA2, Class B2, 13.569% (SOFR30A + 850 bps), 2/25/42 (144A)	2,805,647
6,608,000(a)	Freddie Mac STACR Trust, Series 2019-DNA3, Class B2, 13.333% (SOFR30A + 826 bps), 7/25/49 (144A)	7,291,094

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

34Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Collateralized Mortgage Obligations—(continued)
3,150,000(a)	Freddie Mac STACR Trust, Series 2019-DNA4, Class B2, 11.433% (SOFR30A + 636 bps), 10/25/49 (144A)	$ 3,287,120
3,635,000(a)	Freddie Mac STACR Trust, Series 2019-FTR3, Class B2, 9.95% (SOFR30A + 491 bps), 9/25/47 (144A)	3,526,812
1,900,000(a)	Freddie Mac Structured Agency Credit Risk Debt Notes, Series 2020-HQA5, Class B2, 12.469% (SOFR30A + 740 bps), 11/25/50 (144A)	2,114,897
795,000(a)	Freddie Mac Structured Agency Credit Risk Debt Notes, Series 2021-DNA2, Class B2, 11.069% (SOFR30A + 600 bps), 8/25/33 (144A)	808,759
14,603	Global Mortgage Securitization, Ltd., Series 2004-A, Class B1, 5.25%, 11/25/32 (144A)	6,573
176,418	Global Mortgage Securitization, Ltd., Series 2004-A, Class B2, 5.25%, 11/25/32 (144A)	2
430,000(a)	Home Re, Ltd., Series 2020-1, Class B1, 12.412% (1 Month USD LIBOR + 700 bps), 10/25/30 (144A)	439,766
1,207,914(a)	Home Re, Ltd., Series 2020-1, Class M2, 10.662% (1 Month USD LIBOR + 525 bps), 10/25/30 (144A)	1,223,466
3,170,000(a)	Home Re, Ltd., Series 2021-2, Class B1, 9.219% (SOFR30A + 415 bps), 1/25/34 (144A)	3,048,558
1,172,498(a)	Oaktown Re V, Ltd., Series 2020-2A, Class M2, 10.433% (SOFR30A + 536 bps), 10/25/30 (144A)	1,195,648
4,930,000(a)	PNMAC GMSR Issuer Trust, Series 2018-GT1, Class A, 9.262% (1 Month USD LIBOR + 385 bps), 2/25/25 (144A)	4,927,515
1,800,000(e)	RMF Buyout Issuance Trust, Series 2022-HB1, Class M5, 4.50%, 4/25/32 (144A)	200,250
5,880,000(a)	STACR Trust, Series 2018-HRP2, Class B2, 15.683% (SOFR30A + 1,061 bps), 2/25/47 (144A)	6,804,097
	Total Collateralized Mortgage Obligations (Cost $84,316,771)	$85,388,995


	Commercial Mortgage-Backed Securities—0.3% of Net Assets
899,000(a)	Freddie Mac Multifamily Structured Credit Risk, Series 2021-MN1, Class B1, 12.819% (SOFR30A + 775 bps), 1/25/51 (144A)	$ 859,884

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2335

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Commercial Mortgage-Backed Securities—(continued)
3,210,039(a)	Freddie Mac Multifamily Structured Credit Risk, Series 2021-MN3, Class M1, 7.369% (SOFR30A + 230 bps), 11/25/51 (144A)	$ 3,097,077
2,500,000(a)	Multifamily Connecticut Avenue Securities Trust, Series 2020-01, Class M10, 8.933% (SOFR30A + 386 bps), 3/25/50 (144A)	2,404,050
	Total Commercial Mortgage-Backed Securities (Cost $6,135,048)	$6,361,011


	Convertible Corporate Bonds — 1.0% of Net Assets
	REITs — 1.0%
4,895,000	PennyMac Corp., 5.50%, 3/15/26	$ 4,307,600
24,685,100	Redwood Trust, Inc., 7.75%, 6/15/27	22,417,156
	Total REITs	$26,724,756


	Total Convertible Corporate Bonds (Cost $26,484,767)	$26,724,756


	Corporate Bonds — 9.3% of Net Assets
	Advertising — 0.1%
1,860,000	Clear Channel Outdoor Holdings, Inc., 7.50%, 6/1/29 (144A)	$ 1,480,578
570,000	Clear Channel Outdoor Holdings, Inc., 7.75%, 4/15/28 (144A)	476,651
	Total Advertising	$1,957,229


	Aerospace & Defense — 0.3%
5,000,000	Boeing Co., 5.15%, 5/1/30	$ 4,957,582
3,369,000	Bombardier, Inc., 7.875%, 4/15/27 (144A)	3,358,272
	Total Aerospace & Defense	$8,315,854


	Airlines — 0.2%
4,550,000	American Airlines 2021-1 Class B Pass Through Trust, 3.95%, 7/11/30	$ 3,938,744
363,517	British Airways 2020-1 Class B Pass Through Trust, 8.375%, 11/15/28 (144A)	366,498
	Total Airlines	$4,305,242

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

36Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Auto Parts & Equipment — 0.1%
1,126,000	American Axle & Manufacturing, Inc., 6.25%, 3/15/26	$ 1,097,927
1,773,000	Dealer Tire LLC/DT Issuer LLC, 8.00%, 2/1/28 (144A)	1,630,588
	Total Auto Parts & Equipment	$2,728,515


	Banks — 5.0%
EUR 4,700,000(e)(f)	ABN AMRO Bank NV, 4.375% (5 yr. EUR Swap + 467 bps)	$ 4,763,953
EUR 5,300,000(e)(f)	ABN AMRO Bank NV, 4.75% (5 yr. EUR Swap + 390 bps)	5,054,643
5,000,000(e)	Banco Santander SA, 3.225% (1 Year CMT Index + 160 bps), 11/22/32	3,984,142
5,000,000(e)	BPCE SA, 3.116% (SOFR + 173 bps), 10/19/32 (144A)	3,891,712
4,000,000	BPCE SA, 4.875%, 4/1/26 (144A)	3,847,474
1,818,000	Freedom Mortgage Corp., 8.25%, 4/15/25 (144A)	1,796,522
8,650,000(e)(f)	ING Groep NV, 6.50% (5 Year USD Swap Rate + 445 bps)	8,152,735
4,917,000(e)	Intesa Sanpaolo S.p.A., 7.778% (1 Year CMT Index + 390 bps), 6/20/54 (144A)	4,974,339
5,857,000(e)(f)	Lloyds Banking Group Plc, 7.50% (5 Year USD Swap Rate + 450 bps)	5,536,329
8,700,000(e)	Morgan Stanley, 5.297% (SOFR + 262 bps), 4/20/37	8,256,216
8,125,000(e)(f)	NatWest Group Plc, 8.00% (5 Year USD Swap Rate + 572 bps)	8,035,219
6,220,000(e)	Societe Generale SA, 6.221% (1 Year CMT Index + 320 bps), 6/15/33 (144A)	5,905,137
9,300,000(e)	Standard Chartered Plc, 3.603% (1 Year CMT Index + 190 bps), 1/12/33 (144A)	7,509,725
31,703,000(e)(f)	UBS Group AG, 3.875% (5 Year CMT Index + 310 bps) (144A)	26,246,914
29,708,000(e)(f)	UBS Group AG, 4.875% (5 Year CMT Index + 340 bps) (144A)	24,694,775
7,425,000(e)(f)	UBS Group AG, 5.125% (5 Year CMT Index + 486 bps)	6,647,424
	Total Banks	$129,297,259


	Chemicals — 0.1%
3,487,000	LSF11 A5 HoldCo LLC, 6.625%, 10/15/29 (144A)	$ 2,911,544
	Total Chemicals	$2,911,544

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2337

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Commercial Services — 0.1%
2,255,000	Allied Universal Holdco LLC/Allied Universal Finance Corp., 9.75%, 7/15/27 (144A)	$ 2,068,035
	Total Commercial Services	$2,068,035


	Diversified Financial Services — 0.4%
8,630,000(e)	Capital One Financial Corp., 5.268% (SOFR + 237 bps), 5/10/33	$ 8,220,812
2,920,000	Provident Funding Associates LP/PFG Finance Corp., 6.375%, 6/15/25 (144A)	2,585,860
	Total Diversified Financial Services	$10,806,672


	Food — 0.2%
4,450,000	JBS USA LUX SA/JBS USA Food Co./JBS USA Finance, Inc., 5.75%, 4/1/33 (144A)	$ 4,276,529
	Total Food	$4,276,529


	Oil & Gas — 0.2%
5,000,000	Aker BP ASA, 3.10%, 7/15/31 (144A)	$ 4,146,702
	Total Oil & Gas	$4,146,702


	Pipelines — 0.3%
2,200,000	Delek Logistics Partners LP/Delek Logistics Finance Corp., 6.75%, 5/15/25	$ 2,157,474
2,741,000(e)(f)	Energy Transfer LP, 9.349% (3 Month USD LIBOR + 403 bps)	2,480,618
3,328,000	EnLink Midstream Partners LP, 5.60%, 4/1/44	2,738,646
	Total Pipelines	$7,376,738


	Retail — 0.2%
4,880,000	AutoNation, Inc., 3.85%, 3/1/32	$ 4,138,372
	Total Retail	$4,138,372


	Semiconductors — 0.1%
5,000,000	Broadcom, Inc., 2.45%, 2/15/31 (144A)	$ 4,060,192
	Total Semiconductors	$4,060,192


	Software — 0.1%
3,580,000	AthenaHealth Group, Inc., 6.50%, 2/15/30 (144A)	$ 3,033,373
	Total Software	$3,033,373


	Telecommunications — 1.8%
41,014,000	Level 3 Financing, Inc., 10.50%, 5/15/30 (144A)	$ 42,484,973
3,364,000	Windstream Escrow LLC/Windstream Escrow Finance Corp., 7.75%, 8/15/28 (144A)	2,833,365
	Total Telecommunications	$45,318,338

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

38Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Transportation — 0.1%
2,065,000	Danaos Corp., 8.50%, 3/1/28 (144A)	$ 2,086,600
	Total Transportation	$2,086,600


	Total Corporate Bonds (Cost $239,960,785)	$236,827,194

Shares
	Convertible Preferred Stock — 0.0%† of Net Assets
	Professional Services — 0.0%†
15,562	Clarivate Plc, 5.25%, 6/1/24	$ 648,002
	Total Professional Services	$648,002


	Total Convertible Preferred Stock (Cost $743,177)	$648,002


	Preferred Stock — 0.2% of Net Assets
	Technology Hardware, Storage & Peripherals — 0.2%
105,743(g)	Samsung Electronics Co., Ltd.	$ 4,761,816
	Total Technology Hardware, Storage & Peripherals	$4,761,816


	Total Preferred Stock (Cost $4,325,784)	$4,761,816

Principal Amount USD ($)
	Insurance-Linked Securities — 3.5% of Net Assets#
	Event Linked Bonds — 1.9%
	Earthquakes – California — 0.0%†
500,000(a)	Sutter Re, 12.159%, (3 Month U.S. Treasury Bill + 675 bps), 6/19/26 (144A)	$ 502,600
	Earthquakes – U.S. — 0.1%
500,000(a)	Torrey Pines Re Pte, 9.329%, (3 Month U.S. Treasury Bill + 392 bps), 6/7/24 (144A)	$ 490,650
1,000,000(a)	Ursa Re, 10.909%, (3 Month U.S. Treasury Bill + 550 bps), 12/6/25 (144A)	1,000,000
		$ 1,490,650

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2339

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Flood – U.S. — 0.1%
1,350,000(a)	FloodSmart Re, 18.989%, (3 Month U.S. Treasury Bill + 1,358 bps), 3/1/24 (144A)	$ 1,305,450
1,000,000(a)	FloodSmart Re, 21.659%, (1 Month U.S. Treasury Bill + 1,625 bps), 3/11/26 (144A)	1,029,400
		$ 2,334,850


	Health – U.S. — 0.2%
1,750,000(a)	Vitality Re XIII, 7.409%, (3 Month U.S. Treasury Bill + 200 bps), 1/6/26 (144A)	$ 1,713,425
1,750,000(a)	Vitality Re XIV, 8.909%, (3 Month U.S. Treasury Bill + 350 bps), 1/5/27 (144A)	1,790,600
600,000(a)	Vitality Re XIV, 9.909%, (3 Month U.S. Treasury Bill + 450 bps), 1/5/27 (144A)	599,580
		$ 4,103,605


	Multiperil – Florida — 0.0%†
650,000(a)	Sanders Re, 13.409%, (3 Month U.S. Treasury Bill + 800 bps), 6/5/26 (144A)	$ 662,350
	Multiperil – U.S. — 0.5%
1,200,000(a)	Bonanza Re, 10.256%, (3 Month U.S. Treasury Bill + 487 bps), 2/20/24 (144A)	$ 1,115,760
1,250,000(a)	Easton Re Pte, 9.916%, (3 Month U.S. Treasury Bill + 453 bps), 1/8/24 (144A)	1,240,500
250,000(a)	Four Lakes Re, 11.909%, (3 Month U.S. Treasury Bill + 650 bps), 1/7/26 (144A)	249,175
500,000(a)	Four Lakes Re, 12.709%, (3 Month U.S. Treasury Bill + 730 bps), 1/5/24 (144A)	489,350
500,000(a)	Four Lakes Re, 15.569%, (3 Month U.S. Treasury Bill + 1,016 bps), 1/5/24 (144A)	489,850
500,000(a)	Herbie Re, 15.129%, (3 Month U.S. Treasury Bill + 972 bps), 1/8/25 (144A)	484,700
1,300,000(a)	Merna Re II, 13.159%, (3 Month U.S. Treasury Bill + 775 bps), 7/7/26 (144A)	1,288,040
500,000(a)	Residential Re, 10.589%, (3 Month U.S. Treasury Bill + 518 bps), 12/6/25 (144A)	477,500
1,000,000(a)	Residential Re, 11.919%, (3 Month U.S. Treasury Bill + 651 bps), 12/6/24 (144A)	959,600
500,000(a)	Residential Re, 12.409%, (3 Month U.S. Treasury Bill + 700 bps), 12/6/26 (144A)	496,450
250,000(a)	Residential Re, 13.649%, (3 Month U.S. Treasury Bill + 824 bps), 12/6/24 (144A)	241,900

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

40Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Multiperil – U.S. — (continued)
750,000(a)	Residential Re, 17.319%, (3 Month U.S. Treasury Bill + 1,191 bps), 12/6/25 (144A)	$ 713,850
500,000(a)	Sakura Re, 18.909%, (3 Month U.S. Treasury Bill + 1,350 bps), 1/5/26 (144A)	538,700
1,250,000(a)	Sanders Re II, 8.659%, (3 Month U.S. Treasury Bill + 325 bps), 4/7/25 (144A)	1,192,500
800,000(a)	Sanders Re III, 8.909%, (3 Month U.S. Treasury Bill + 350 bps), 4/7/26 (144A)	747,440
1,600,000(a)	Sanders Re III, 11.159%, (3 Month U.S. Treasury Bill + 575 bps), 4/7/27 (144A)	1,574,240
250,000(a)	Solomon Re, 10.659%, (3 Month U.S. Treasury Bill + 525 bps), 6/8/26 (144A)	250,150
300,000(a)	Sussex Re, 13.789%, (3 Month U.S. Treasury Bill + 838 bps), 1/8/25 (144A)	288,330
		$ 12,838,035


	Multiperil – U.S. & Canada — 0.2%
250,000(a)	Kilimanjaro III Re, 9.969%, (3 Month U.S. Treasury Bill + 456 bps), 4/20/26 (144A)	$ 236,000
250,000(a)	Kilimanjaro III Re, 10.269%, (3 Month U.S. Treasury Bill + 486 bps), 4/21/25 (144A)	237,000
250,000(a)	Kilimanjaro III Re, 17.769%, (3 Month U.S. Treasury Bill + 1,236 bps), 4/21/25 (144A)	237,275
250,000(a)	Kilimanjaro III Re, 17.769%, (3 Month U.S. Treasury Bill + 1,236 bps), 4/20/26 (144A)	232,825
500,000(a)	Mona Lisa Re, 12.409%, (3 Month U.S. Treasury Bill + 700 bps), 7/8/25 (144A)	479,250
1,000,000(a)	Mona Lisa Re, 17.909%, (3 Month U.S. Treasury Bill + 1,250 bps), 1/8/26 (144A)	1,076,000
1,750,000(a)	Mystic Re IV, 11.539%, (3 Month U.S. Treasury Bill + 613 bps), 1/8/25 (144A)	1,643,600
500,000(a)	Mystic Re IV, 11.69%, (3 Month U.S. Treasury Bill + 1,160 bps), 1/8/25 (144A)	471,050
500,000(a)	Mystic Re IV, 15.159%, (3 Month U.S. Treasury Bill + 975 bps), 1/8/24 (144A)	487,200
		$ 5,100,200


	Multiperil – U.S. Regional — 0.1%
500,000(a)	Aquila Re, 12.909%, (3 Month U.S. Treasury Bill + 750 bps), 6/8/26 (144A)	$ 499,600

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2341

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Multiperil – U.S. Regional — (continued)
250,000(a)	Aquila Re, 14.659%, (3 Month U.S. Treasury Bill + 925 bps), 6/8/26 (144A)	$ 253,125
1,300,000(a)	Locke Tavern Re, 4.75%, (3 Month U.S. Treasury Bill + 475 bps), 4/9/26 (144A)	1,314,950
		$ 2,067,675


	Multiperil – Worldwide — 0.1%
1,250,000(a)	Atlas Capital Re, 12.55%, (SOFR + 725 bps), 6/5/26 (144A)	$ 1,259,125
1,000,000(a)	Northshore Re II, 11.159%, (3 Month U.S. Treasury Bill + 575 bps), 1/8/24 (144A)	989,000
		$ 2,248,125


	Pandemic – U.S — 0.0%†
250,000(a)	Vitality Re XI, 7.209%, (3 Month U.S. Treasury Bill + 180 bps), 1/9/24 (144A)	$ 247,150
	Windstorm – Florida — 0.1%
1,250,000(a)	First Coast Re III Pte, 11.529%, (3 Month U.S. Treasury Bill + 618 bps), 4/7/25 (144A)	$ 1,181,750
1,000,000(a)	First Coast Re IV, 9.00%, (3 Month U.S. Treasury Bill + 900 bps), 4/7/26 (144A)	998,500
750,000(a)	Merna Re II, 10.909%, (3 Month U.S. Treasury Bill + 550 bps), 7/8/24 (144A)	704,850
		$ 2,885,100


	Windstorm – Japan — 0.0%†
500,000(a)	Sakura Re, 7.659%, (3 Month U.S. Treasury Bill + 225 bps), 4/7/25 (144A)	$ 491,100
	Windstorm – North Carolina — 0.0%†
1,000,000(a)	Cape Lookout Re, 9.109%, (1 Month U.S. Treasury Bill + 370 bps), 3/22/24 (144A)	$ 972,200
	Windstorm – U.S. — 0.3%
1,500,000(a)	Alamo Re, 13.909%, (1 Month U.S. Treasury Bill + 850 bps), 6/7/26 (144A)	$ 1,513,500
500,000(a)	Bonanza Re, 10.279%, (3 Month U.S. Treasury Bill + 487 bps), 12/23/24 (144A)	449,600
250,000(a)	Bonanza Re, 11.159%, (3 Month U.S. Treasury Bill + 575 bps), 3/16/25 (144A)	175,000
250,000(a)	Bonanza Re, 13.659%, (3 Month U.S. Treasury Bill + 825 bps), 1/8/26 (144A)	246,900
1,500,000(a)	Cape Lookout Re, 11.909%, (1 Month U.S. Treasury Bill + 650 bps), 4/28/26 (144A)	1,515,750
600,000(a)	Gateway Re, 18.409%, (1 Month U.S. Treasury Bill + 1,300 bps), 2/24/26 (144A)	624,780

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

42Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Windstorm – U.S. — (continued)
1,600,000(a)	Merna Re II, 15.659%, (3 Month U.S. Treasury Bill + 1,025 bps), 7/7/26 (144A)	$ 1,657,120
1,500,000(a)	Queen Street Re, 12.909%, (3 Month U.S. Treasury Bill + 750 bps), 12/8/25 (144A)	1,504,050
		$ 7,686,700


	Windstorm – U.S. Multistate — 0.0%†
250,000(a)	Commonwealth Re, 9.409%, (3 Month U.S. Treasury Bill + 400 bps), 7/8/26 (144A)	$ 254,275
	Windstorm – U.S. Regional — 0.0%†
1,000,000(a)	Citrus Re, 12.136%, (3 Month U.S. Treasury Bill + 675 bps), 6/7/26 (144A)	$ 1,002,900
	Winterstorm – Florida — 0.2%
2,000,000(a)	Integrity Re, 17.409%, (1 Month U.S. Treasury Bill + 1,200 bps), 6/6/25 (144A)	$ 2,029,200
1,500,000(a)	Lightning Re, 16.409%, (3 Month U.S. Treasury Bill + 1,100 bps), 3/31/26 (144A)	1,541,700
		$ 3,570,900


	Total Event Linked Bonds	$ 48,458,415

Face Amount USD ($)
	Collateralized Reinsurance — 0.4%
	Multiperil – U.S. — 0.3%
1,800,000(c)(h) +	Ballybunion Re 2020, 2/29/24	$ 203,353
750,000(c)(h) +	Ballybunion Re 2021-3, 7/31/25	16,769
4,000,000(c)(h) +	Ballybunion Re 2023, 12/31/28	4,130,536
3,750,000(c)(h) +	Gamboge Re, 3/31/29	3,419,866
		$ 7,770,524


	Multiperil – Worldwide — 0.1%
500,000(c)(h) +	Amaranth Re 2023, 12/31/28	$ 479,236
1,000,000(c)(h) +	Clarendon Re 2023, 12/31/28	993,009
700,000(c)(h) +	Cypress Re 2017, 1/31/24	70
500,000(h) +	Limestone Re 2020-1, 3/1/24 (144A)	—
500,000(c)(h) +	Merion Re 2023-1, 12/31/28	490,876
250,000(c)(h) +	Old Head Re 2023, 12/31/28	222,534
500,000(c)(h) +	Pine Valley Re 2023, 12/31/28	—
250,000(c)(h) +	Porthcawl Re 2023, 12/31/28	234,852
700,000(c)(h) +	Resilience Re, 5/1/24	—

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2343

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Face Amount USD ($)		Value
	Multiperil – Worldwide — (continued)
300,000(c)(h) +	Walton Health Re 2019, 6/30/24	$ 158,410
250,000(c)(h) +	Walton Heath Re 2021, 1/15/24	30,944
		$ 2,609,931


	Total Collateralized Reinsurance	$10,380,455


	Reinsurance Sidecars — 1.2%
	Multiperil – U.S. — 0.1%
2,500,000(c)(h) +	Carnoustie Re 2023, 12/31/28	$ 2,725,000
1,500,000(c)(g) +	Harambee Re 2019, 12/31/24	2,700
		$ 2,727,700


	Multiperil – Worldwide — 1.1%
439,922(c)(g) +	Alturas Re 2021-2, 12/31/24	$ —
1,000,000(c)(g) +	Alturas Re 2021-3, 7/31/25	126,600
24,956(c)(g) +	Alturas Re 2022-2, 12/31/27	7,215
750,000(c)(h) +	Bantry Re 2021, 12/31/24	1,500
4,000,000(c)(h) +	Bantry Re 2023, 12/31/28	4,479,913
1,391,977(c)(h) +	Berwick Re 2019-1, 12/31/24	222,020
2,500,000(c)(h) +	Berwick Re 2023, 12/31/28	2,799,928
3,000,000(c)(h) +	Eccleston Re 2023, 11/30/28	3,087,445
100,000(c)(h) +	Eden Re II, 3/22/24 (144A)	36,700
74,892(c)(h) +	Eden Re II, 3/21/25 (144A)	26,047
54,774(c)(h) +	Eden Re II, 3/21/25 (144A)	19,176
500,000(c)(h) +	Gleneagles Re 2021, 12/31/24	50
3,000,000(c)(h) +	Gullane Re 2023, 12/31/28	3,328,037
250,000(c)(g) +	Lion Rock Re 2021, 12/31/24	52,325
2,000,000(c)(h) +	Merion Re 2021-2, 12/31/24	393,000
3,500,000(c)(h) +	Pangaea Re 2023-1, 12/31/28	3,920,000
1,250,000(c)(h) +	Pangaea Re 2023-3, 5/31/29	1,300,000
500,000(h) +	RosaPenna Re 2021, 7/31/25	20,000
200,000(h) +	Sector Re V, 3/1/24 (144A)	101,480
100,000(h) +	Sector Re V, 12/1/24 (144A)	172,140
1,500,000(g) +	Thopas Re 2019, 12/31/24	4,950
1,000,000(g) +	Thopas Re 2020, 12/31/23	—
1,500,000(g) +	Thopas Re 2021, 12/31/24	24,150
2,500,000(c)(g) +	Thopas Re 2023, 12/31/28	2,782,250
1,500,000(g) +	Torricelli Re 2021, 7/31/25	47,399
2,500,000(c)(g) +	Torricelli Re 2023, 6/30/29	2,563,100
1,500,000(g) +	Viribus Re 2019, 12/31/24	10,650
1,000,000(c)(g) +	Viribus Re 2020, 12/31/23	34,500

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

44Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Face Amount USD ($)		Value
	Multiperil – Worldwide — (continued)
2,000,000(c)(g) +	Viribus Re 2023, 12/31/28	$ 2,411,800
600,000(c)(h) +	Woburn Re 2019, 12/31/24	103,848
		$ 28,076,223


	Total Reinsurance Sidecars	$30,803,923


	Total Insurance-Linked Securities (Cost $87,234,404)	$89,642,793

Principal Amount USD ($)
	Foreign Government Bonds — 0.9% of Net Assets
	Czech Republic — 0.4%
CZK 243,110,000	Czech Republic Government Bond, 5.700%, 5/25/24	$ 11,153,309
	Total Czech Republic	$11,153,309


	Russia — 0.0%†
RUB 59,913,000(b)+	Russian Federal Bond - OFZ, 7.000%, 8/16/23	$ 32,650
RUB 61,885,000(b)+	Russian Federal Bond - OFZ, 7.700%, 3/23/33	33,725
RUB 59,074,000(b)+	Russian Federal Bond - OFZ, 8.150%, 2/3/27	32,193
	Total Russia	$98,568


	South Africa — 0.3%
ZAR 153,782,964	Republic of South Africa Government Bond, 8.250%, 3/31/32	$ 7,340,135
	Total South Africa	$7,340,135


	Trinidad — 0.1%
2,113,000	Trinidad & Tobago Government International Bond, 4.500%, 8/4/26 (144A)	$ 2,050,220
	Total Trinidad	$2,050,220


	United Kingdom — 0.1%
GBP 1,483,668	United Kingdom Gilt, 4.250%, 6/7/32	$ 1,908,658
	Total United Kingdom	$1,908,658


	Total Foreign Government Bonds (Cost $26,994,344)	$22,550,890

Shares
	Closed-End Funds — 0.6% of Net Assets
1,886,372	Aberdeen Asia-Pacific Income Fund, Inc.	$ 5,187,523

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2345

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Shares		Value
	Closed-End Funds — (continued)
165,651	Cohen & Steers Tax-Advantaged Preferred Securities & Income Fund	$ 3,019,817
285,533	Highland Income Fund	2,429,886
1,354,239	Invesco Senior Income Trust	5,240,905
	Total Closed-End Funds (Cost $17,492,881)	$15,878,131

Principal Amount USD ($)
	Equity Linked Notes — 17.2% of Net Assets
	Automobiles — 0.5%
769,400	Canadian Imperial Bank of Commerce (Stellantis NV), 14.01% (N/A + 0 bps), 2/7/24	$ 13,160,587
	Total Automobiles	$ 13,160,587


	Banks — 0.7%
430,700	Goldman Sachs International (Truist Financial Corp.), 20.28%, 3/29/24	$ 14,600,730
244,300	Mizuho Markets Cayman LP (Regions Financial Corp.), 16.40%, 4/1/24	4,827,368
	Total Banks	$ 19,428,098


	Broadline Retail — 1.3%
86,500	Citigroup Global Markets Holdings, Inc. (Ebay Inc.), 15.31%, 11/10/23 (144A)	$ 3,651,598
59,500	Goldman Sachs International (Amazon.com, Inc.), 12.45%, 4/24/24	6,628,300
18,600	Goldman Sachs International (Amazon.com, Inc.), 13.48%, 3/26/24	1,999,221
161,500	Royal Bank of Canada (Ebay, Inc.), 12.15%, 3/5/24 (144A)	7,328,062
131,700	Toronto-Dominion Bank (Alibaba Group Holding Ltd.), 21.40%, 10/13/23	13,183,170
	Total Broadline Retail	$ 32,790,351


	Capital Markets — 0.9%
118,200	Canadian Imperial Bank of Commerce (The Charles Schwab Corp.), 14.20%, 3/19/24	$ 7,678,154
150,600	Citigroup Global Markets Holdings, Inc. (The Charles Schwab Corp.), 10.45%, 3/7/24 (144A)	10,395,918
79,100	Goldman Sachs International (The Charles Schwab Corp.), 16.21%, 3/29/24	5,064,773
	Total Capital Markets	$ 23,138,845

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

46Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Chemicals — 0.2%
61,000	Citigroup Global Markets Holdings, Inc. (CF Industries Holdings Inc.), 18.44%, 10/12/23 (144A)	$ 5,190,795
	Total Chemicals	$ 5,190,795


	Consumer Finance — 0.7%
132,700	Citigroup Global Markets Holdings, Inc. (Aercap Holdings NV), 15.43%, 9/21/23 (144A)	$ 7,122,805
76,700	Mizuho Markets Cayman LP (Aercap Holdings NV), 9.50%, 7/23/24	4,975,913
79,200	Mizuho Markets Cayman LP (Aercap Holdings NV), 9.65%, 8/8/24	5,124,240
	Total Consumer Finance	$ 17,222,958


	Electrical Equipment — 0.8%
37,000	Merrill Lynch International & Co. CV (Generac Holdings Inc.), 22.37%, 10/23/23	$ 4,544,044
52,400	Mizuho Markets Cayman LP (Generac Holdings Inc.), 18.54%, 2/8/24	6,468,518
65,300	Royal Bank of Canada (Generac Holdings, Inc.), 18.58%, 2/26/24 (144A)	9,224,278
	Total Electrical Equipment	$ 20,236,840


	Entertainment — 0.2%
314,600	Goldman Sachs International (Warner Bros. Discovery, Inc.), 18.72%, 3/29/24	$ 4,371,367
	Total Entertainment	$ 4,371,367


	Health Care Equipment & Supplies — 0.6%
28,500	Merrill Lynch International & Co. CV (Stryker Corp.), 8.23%, 2/9/24	$ 7,678,755
85,100	Mizuho Markets Cayman LP (Medtronic plc), 8.74%, 5/2/24	7,517,308
	Total Health Care Equipment & Supplies	$ 15,196,063


	Health Care Providers & Services — 0.1%
72,000	Royal Bank of Canada (Syneos Health Inc.), 14.41%, 10/13/23	$ 3,214,800
	Total Health Care Providers & Services	$ 3,214,800

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2347

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Hotels, Restaurants & Leisure — 0.4%
326,500	Canadian Imperial Bank of Commerce (Draftkings Inc.), 28.90%, 11/17/23	$ 4,551,084
180,600	Merrill Lynch International & Co. CV (International Game Technology Plc), 15.85%, 3/11/24	5,339,439
	Total Hotels, Restaurants & Leisure	$ 9,890,523


	IT Services — 2.6%
56,400	Canadian Imperial Bank of Commerce (Alphabet, Inc.), 10.15%, 4/24/24	$ 6,595,585
65,000	Citigroup Global Markets Holdings, Inc. (Cognizant Technology Solutions Corp.), 12.39%, 11/20/23 (144A)	3,737,500
18,100	Goldman Sachs International (Alphabet, Inc.), 11.13%, 3/26/24	2,004,249
379,200	Merrill Lynch International & Co. CV (Pure Storage, Inc.), 14.28%, 2/26/24	12,697,512
249,600	Morgan Stanley (Pure Storage, Inc.), 14.07%, 2/9/24	7,869,888
166,900	Royal Bank of Canada (Advanced Micro Devices, Inc.), 17.13%, 1/23/24 (144A)	12,881,509
110,200	Toronto-Dominion Bank (Alphabet, Inc.), 10.25%, 5/21/24	12,855,381
67,900	Toronto-Dominion Bank (Alphabet, Inc.), 10.51%, 4/12/24	7,765,723
	Total IT Services	$ 66,407,347


	Metals & Mining — 0.9%
195,700	Canadian Imperial Bank of Commerce (Teck Resources, Ltd.), 15.95% (N/A + 0 bps), 1/29/24	$ 8,361,087
307,200	Citigroup Global Markets Holdings, Inc. (Barrick Gold Corp.), 14.74%, 1/26/24 (144A)	5,349,888
298,500	Citigroup Global Markets Holdings, Inc. (Teck Resources, Ltd.), 20.23%, 11/9/23 (144A)	10,233,177
	Total Metals & Mining	$ 23,944,152


	Oil, Gas & Consumable Fuels — 3.1%
264,500	BNP Paribas Issuance BV (Comstock Resources Inc.), 23.70%, 8/31/23 (144A)	$ 3,576,040
438,500	BNP Paribas Issuance BV (Kosmos Energy Ltd.), 21.08%, 3/8/24 (144A)	3,350,140
279,300	Canadian Imperial Bank of Commerce (Antero Resources Corp.), 19.15%, 6/26/24	6,655,998
164,300	Citigroup Global Markets Holdings, Inc. (EQT Corp.), 19.08%, 1/26/24 (144A)	6,252,436

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

48Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Oil, Gas & Consumable Fuels — (continued)
85,000	Citigroup Global Markets Holdings, Inc. (Occidental Petroleum Corp.), 19.37%, 9/28/23 (144A)	$ 5,408,125
101,000	Citigroup Global Markets Holdings, Inc. (Occidental Petroleum Corp.), 19.62%, 10/10/23 (144A)	6,397,845
226,800	Citigroup Global Markets Holdings, Inc. (Range Resources Corp.), 19.36%, 1/26/24 (144A)	6,325,452
555,000	Goldman Sachs International (Energy Transfer LP), 18.47%, 10/10/23	6,727,710
343,900	Goldman Sachs International (Kosmos Energy Ltd.), 21.33%, 3/29/24	2,439,971
155,800	Royal Bank of Canada (EQT Corp.), 16.46%, 6/26/24 (144A)	6,486,733
102,500	Royal Bank of Canada (EQT Corp.), 20.50%, 8/31/23	4,423,900
208,800	Toronto-Dominion Bank (EQT Corp.), 21.21%, 8/14/23	8,887,572
164,800	Toronto-Dominion Bank (Occidental Petroleum Corp.), 15.75%, 3/13/24	10,302,472
48,800	Toronto-Dominion Bank (Occidental Petroleum Corp.), 17.70%, 9/1/23	3,129,300
	Total Oil, Gas & Consumable Fuels	$ 80,363,694


	Pharmaceuticals — 0.2%
26,100	Toronto-Dominion Bank (Alnylam Pharmaceuticals Inc.), 14.70%, 2/8/24	$ 5,407,920
	Total Pharmaceuticals	$ 5,407,920


	Semiconductors & Semiconductor Equipment — 2.7%
100,000	Citigroup Global Markets Holdings, Inc. (Micron Technology Inc.), 17.68%, 10/26/23 (144A)	$ 5,903,300
81,600	Merrill Lynch International & Co. CV (Applied Materials), 0.144%, 3/11/24	10,615,507
192,300	Merrill Lynch International & Co. CV (Microchip Technology, Inc.), 13.63%, 5/24/24	15,636,875
115,000	Merrill Lynch International & Co. CV (Micron Technology Inc.), 16.45%, 10/13/23	6,908,050
50,000	Merrill Lynch International & Co. CV (MKS Instruments Inc.), 17.63%, 11/10/23	3,897,850
88,800	Royal Bank of Canada (Microchip Technology Incorporated), 13.57%, 3/5/24 (144A)	7,589,736

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2349

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Semiconductors & Semiconductor Equipment — (continued)
140,000	Royal Bank of Canada (Micron Technology Inc.), 14.35%, 8/14/23	$ 9,725,100
74,800	Royal Bank of Canada (MKS Instruments, Inc.), 13.38%, 8/14/23	8,290,084
	Total Semiconductors & Semiconductor Equipment	$ 68,566,502


	Software — 1.3%
128,700	Citigroup Global Markets Holdings, Inc. (DocuSign, Inc.), 26.39%, 12/19/23 (144A)	$ 6,733,584
72,700	Citigroup Global Markets Holdings, Inc. (Zoom Video Communications Inc.), 23.01%, 10/26/23 (144A)	5,350,720
156,900	Mizuho Markets Cayman LP (Zoom Video Communications, Inc.), 19.80%, 3/8/24	11,594,125
49,500	Mizuho Markets Cayman LP (Zoom Video Communications, Inc.), 22.45%, 11/21/23	3,777,098
67,200	Royal Bank of Canada (Zoom Video Communications, Inc.), 20.63%, 1/23/24 (144A)	4,826,304
	Total Software	$ 32,281,831


	Total Equity Linked Notes (Cost $426,947,556)	$ 440,812,673


	U.S. Government and Agency Obligations — 8.3% of Net Assets
34,637,200	U.S. Treasury Bonds, 4.375%, 10/31/24	$ 34,252,944
33,515,200	U.S. Treasury Bonds, 4.500%, 11/30/24	33,177,430
60,239,900	U.S. Treasury Notes, 3.000%, 6/30/24	58,943,330
33,011,000	U.S. Treasury Notes, 3.000%, 7/31/24	32,251,489
13,639,000	U.S. Treasury Notes, 4.125%, 1/31/25	13,431,751
39,594,700	U.S. Treasury Notes, 4.250%, 9/30/24	39,109,046
	Total U.S. Government and Agency Obligations (Cost $212,759,691)	$211,165,990

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

50Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Shares		Value
	SHORT TERM INVESTMENTS — 0.4% of Net Assets
	Open-End Fund — 0.4%
11,368,367(i)	Dreyfus Government Cash Management, Institutional Shares, 5.14%	$ 11,368,367
		$ 11,368,367


	TOTAL SHORT TERM INVESTMENTS (Cost $11,368,367)	$11,368,367

Number of Contracts	Description	Counterparty	Amount	Strike Price	Expiration Date
	Over The Counter (OTC) Put Options On Indices Purchased — 0.0%†
28,803	S&P 500 INDEX	Citibank NA	USD 3,992,424	USD 3,978.09	11/17/23	$ 640,089
	Total Over The Counter (OTC) Put Options On Indices Purchased (Premiums paid $ 3,992,424)					$ 640,089


	TOTAL OPTIONS PURCHASED (Premiums paid $ 3,992,424)					$ 640,089


	TOTAL INVESTMENTS IN UNAFFILIATED ISSUERS — 98.1% (Cost $2,386,218,061)					$ 2,513,035,046
	OTHER ASSETS AND LIABILITIES — 1.9%					$ 47,776,145
	net assets — 100.0%					$2,560,811,191

(A.D.R.)	American Depositary Receipts.
(C.V.A.)	Certificaaten van aandelen (Share Certificates)
(G.D.R.)	Global Depositary Receipts.
bps	Basis Points.
CMT	Constant Maturity Treasury Index.
LIBOR	London Interbank Offered Rate.
REIT	Real Estate Investment Trust.
SOFR	Secured Overnight Financing Rate.
SOFR30A	Secured Overnight Financing Rate 30 Day Average.
(144A)	The resale of such security is exempt from registration under Rule 144A of the Securities Act of 1933. Such securities may be resold normally to qualified institutional buyers. At July 31, 2023, the value of these securities amounted to $621,716,203, or 24.3% of net assets.

(a)	Floating rate note. Coupon rate, reference index and spread shown at July 31, 2023.
(b)	Security is in default.
(c)	Non-income producing security.
(d)	Debt obligation initially issued at one coupon which converts to a higher coupon at a speciﬁc date. The rate shown is the rate at July 31, 2023.

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2351

Table of Contents

Schedule of Investments | 7/31/23 (continued)

(e)	The interest rate is subject to change periodically. The interest rate and/or reference index and spread shown at July 31, 2023.
(f)	Security is perpetual in nature and has no stated maturity date.
(g)	Issued as preference shares.
(h)	Issued as participation notes.
(i)	Rate periodically changes. Rate disclosed is the 7-day yield at July 31, 2023.
*	Senior secured ﬂoating rate loan interests in which the Fund invests generally pay interest at rates that are periodically re-determined 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 or SOFR, (ii) the prime rate offered by one or more major United States banks, (iii) the rate of a certiﬁcate of deposit or (iv) other base lending rates used by commercial lenders. The interest rate shown is the rate accruing at July 31, 2023.
+	Security is valued using significant unobservable inputs (Level 3).
†	Amount rounds to less than 0.1%.
#	Securities are restricted as to resale.

Restricted Securities	Acquisition date	Cost	Value
Alamo Re	4/12/2023	$ 1,500,000	$ 1,513,500
Alturas Re 2021-2	2/16/2021	22,989	—
Alturas Re 2021-3	7/1/2021	235,326	126,600
Alturas Re 2022-2	4/11/2023	5,284	7,215
Amaranth Re 2023	1/26/2023	417,924	479,236
Aquila Re	5/10/2023	500,000	499,600
Aquila Re	5/10/2023	250,000	253,125
Atlas Capital Re	5/17/2023	1,250,000	1,259,125
Ballybunion Re 2020	12/31/2019	123,519	203,353
Ballybunion Re 2021-3	8/4/2021	15,764	16,769
Ballybunion Re 2023	3/20/2023	4,000,000	4,130,536
Bantry Re 2021	1/11/2021	12,214	1,500
Bantry Re 2023	1/10/2023	4,000,000	4,479,913
Berwick Re 2019-1	2/27/2019	166,329	222,020
Berwick Re 2023	2/1/2023	2,500,000	2,799,928
Bonanza Re	2/13/2020	1,153,152	1,115,760
Bonanza Re	12/15/2020	500,000	449,600
Bonanza Re	1/6/2023	250,000	246,900
Bonanza Re	7/25/2023	208,046	175,000
Cape Lookout Re	3/9/2021	1,000,000	972,200
Cape Lookout Re	4/14/2023	1,500,000	1,515,750
Carnoustie Re 2023	2/15/2023	2,500,000	2,725,000
Citrus Re	4/27/2023	1,000,000	1,002,900
Clarendon Re 2023	3/20/2023	916,657	993,009
Commonwealth Re	6/7/2023	250,000	254,275
Cypress Re 2017	1/24/2017	2,353	70
Easton Re Pte	12/15/2020	1,250,000	1,240,500
Eccleston Re 2023	7/13/2023	3,000,000	3,087,445

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

52Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Restricted Securities	Acquisition date	Cost	Value
Eden Re II	12/23/2019	$ 82,639	$ 36,700
Eden Re II	12/14/2020	43,888	19,176
Eden Re II	1/25/2021	59,884	26,047
First Coast Re III Pte	3/4/2021	1,250,000	1,181,750
First Coast Re IV	3/24/2023	1,000,000	998,500
FloodSmart Re	2/16/2021	1,350,000	1,305,450
FloodSmart Re	2/23/2023	1,000,000	1,029,400
Four Lakes Re	11/5/2020	500,000	489,350
Four Lakes Re	11/5/2020	500,000	489,850
Four Lakes Re	12/22/2022	250,000	249,175
Gamboge Re	4/20/2023	3,169,466	3,419,866
Gateway Re	2/3/2023	600,000	624,780
Gleneagles Re 2021	1/13/2021	9,150	50
Gullane Re 2023	1/10/2023	3,000,000	3,328,037
Harambee Re 2019	12/20/2018	—	2,700
Herbie Re	10/19/2020	500,000	484,700
Integrity Re	3/23/2023	2,000,000	2,029,200
Kilimanjaro III Re	4/8/2021	250,000	237,275
Kilimanjaro III Re	4/8/2021	250,000	232,825
Kilimanjaro III Re	4/8/2021	250,000	236,000
Kilimanjaro III Re	4/8/2021	250,000	237,000
Lightning Re	3/20/2023	1,500,000	1,541,700
Limestone Re 2020-1	1/3/2020	—	—
Lion Rock Re 2021	12/30/2020	107,115	52,325
Locke Tavern Re	3/23/2023	1,300,000	1,314,950
LUKOIL PJSC	4/3/2020	3,354,083	155,622
Magnit PJSC	4/15/2020	12,536,598	618,044
Merion Re 2021-2	12/28/2020	544,188	393,000
Merion Re 2023-1	1/11/2023	441,808	490,876
Merna Re II	6/8/2021	750,000	704,850
Merna Re II	4/5/2023	1,300,000	1,288,040
Merna Re II	4/5/2023	1,600,000	1,657,120
Mona Lisa Re	6/22/2021	500,000	479,250
Mona Lisa Re	12/30/2022	1,000,000	1,076,000
Mystic Re IV	12/15/2020	500,000	487,200
Mystic Re IV	6/9/2021	1,749,106	1,643,600
Mystic Re IV	6/9/2021	500,000	471,050
Northshore Re II	12/2/2020	1,000,000	989,000
Old Head Re 2023	1/11/2023	168,990	222,534
Pangaea Re 2023-1	1/19/2023	3,500,000	3,920,000
Pangaea Re 2023-3	6/29/2023	1,250,000	1,300,000
Pine Valley Re 2023	1/18/2023	446,865	—
Porthcawl Re 2023	1/23/2023	197,811	234,852
Queen Street Re	5/12/2023	1,500,000	1,504,050
Residential Re	10/30/2020	1,002,724	959,600
Residential Re	10/28/2021	500,000	477,500

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2353

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Restricted Securities	Acquisition date	Cost	Value
Residential Re	10/28/2021	$ 750,000	$ 713,850
Residential Re	11/22/2022	500,000	496,450
Residential Re	1/17/2023	238,489	241,900
Resilience Re	2/8/2017	338	—
RosaPenna Re 2021	7/16/2021	—	20,000
Rosneft Oil Co. PJSC	12/6/2019	9,625,119	353,360
Sakura Re	3/24/2021	500,000	491,100
Sakura Re	12/22/2022	500,000	538,700
Sanders Re	5/24/2023	650,000	662,350
Sanders Re II	5/24/2021	1,250,000	1,192,500
Sanders Re III	2/14/2023	749,593	747,440
Sanders Re III	3/24/2023	1,600,000	1,574,240
Sector Re V	4/23/2019	136,333	101,480
Sector Re V	12/4/2019	1,675	172,140
Solomon Re	6/12/2023	250,000	250,150
Sussex Re	1/27/2023	276,785	288,330
Sutter Re	6/6/2023	500,000	502,600
Thopas Re 2019	12/21/2018	—	4,950
Thopas Re 2020	2/5/2020	—	—
Thopas Re 2021	12/30/2020	—	24,150
Thopas Re 2023	2/13/2023	2,500,000	2,782,250
Torrey Pines Re Pte	3/12/2021	500,000	490,650
Torricelli Re 2021	7/1/2021	—	47,399
Torricelli Re 2023	7/19/2023	2,500,000	2,563,100
Ursa Re	4/12/2023	1,000,000	1,000,000
Viribus Re 2019	12/27/2018	—	10,650
Viribus Re 2020	3/12/2020	101,920	34,500
Viribus Re 2023	1/8/2023	2,000,000	2,411,800
Vitality Re XI	1/31/2020	249,637	247,150
Vitality Re XIII	3/6/2023	1,681,983	1,713,425
Vitality Re XIV	1/25/2023	1,750,000	1,790,600
Vitality Re XIV	1/25/2023	600,000	599,580
Walton Health Re 2019	7/18/2019	91,391	158,410
Walton Heath Re 2021	6/28/2021	69,944	30,944
Woburn Re 2019	1/30/2019	83,125	103,848
X5 Retail Group NV (G.D.R.)	9/17/2020	1,738,218	29,164
Total Restricted Securities			$90,798,983
% of Net assets			3.5%

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

54Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

FUTURES CONTRACTS
INDEX FUTURES CONTRACTS

Number of Contracts Long	Description	Expiration Date	Notional Amount	Market Value	Unrealized Appreciation
403	Hang Seng Index Futures	9/28/23	$50,521,235	$52,185,526	$1,664,291

Number of Contracts Short	Description	Expiration Date	Notional Amount	Market Value	Unrealized Appreciation (Depreciation)
165	Japan 10Y Bond (OSE)	9/12/23	$ (171,642,841)	$ (170,259,727)	$ 1,383,114
229	NASDAQ 100 E- Mini	9/15/23	(68,881,759)	(72,627,350)	(3,745,591)
1,884	S&P 500 E-MINI	9/15/23	(417,116,001)	(434,685,900)	(17,569,899)
			$ (657,640,601)	$ (677,572,977)	$ (19,932,376)
TOTAL FUTURES CONTRACTS			$(607,119,366)	$(625,387,451)	$(18,268,085)

Principal amounts are denominated in U.S. dollars (“USD”) unless otherwise noted.

CZK	— Czech Republic Koruna
EUR	— Euro
GBP	— Great British Pound
RUB	— Russia Ruble
ZAR	— South Africa Rand

Purchases and sales of securities (excluding short-term investments) for the year ended July 31, 2023 were as follows:

	Purchases	Sales
Long-Term U.S. Government Securities	$ 579,109,992	$ 367,820,823
Other Long-Term Securities	$1,651,350,424	$1,176,043,944

At July 31, 2023, the net unrealized appreciation on investments based on cost for federal tax purposes of $2,383,065,567 was as follows:

Aggregate gross unrealized appreciation for all investments in which there is an excess of value over tax cost	$ 276,997,656
Aggregate gross unrealized depreciation for all investments in which there is an excess of tax cost over value	(165,296,262)
Net unrealized appreciation	$ 111,701,394

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2355

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels below.

Level 1	–	unadjusted 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 risks, etc.). See Notes to Financial Statements — Note 1A.
Level 3	–	significant unobservable inputs (including the Adviser's own assumptions in determining fair value of investments). See Notes to Financial Statements — Note 1A.

The following is a summary of the inputs used as of July 31, 2023, in valuing the Fund's investments:

	Level 1	Level 2	Level 3	Total
Senior Secured Floating Rate Loan Interests	$ —	$ 21,162,701	$ —	$ 21,162,701
Common Stocks
Consumer Staples Distribution & Retail	—	—	647,208	647,208
Oil, Gas & Consumable Fuels	299,522,005	—	508,982	300,030,987
All Other Common Stocks	969,826,467	—	—	969,826,467
Asset Backed Securities	—	68,596,976	—	68,596,976
Collateralized Mortgage Obligations	—	85,388,995	—	85,388,995
Commercial Mortgage-Backed Securities	—	6,361,011	—	6,361,011
Convertible Corporate Bonds	—	26,724,756	—	26,724,756
Corporate Bonds	—	236,827,194	—	236,827,194
Convertible Preferred Stock	648,002	—	—	648,002
Preferred Stock	4,761,816	—	—	4,761,816
Insurance-Linked Securities
Collateralized Reinsurance
Multiperil – U.S.	—	—	7,770,524	7,770,524
Multiperil – Worldwide	—	—	2,609,931	2,609,931
Reinsurance Sidecars
Multiperil – U.S.	—	—	2,727,700	2,727,700
Multiperil – Worldwide	—	—	28,076,223	28,076,223
All Other Insurance-Linked Securities	—	48,458,415	—	48,458,415
Foreign Government Bonds
Russia	—	—	98,568	98,568
All Other Foreign Government Bonds	—	22,452,322	—	22,452,322
Closed-End Funds	15,878,131	—	—	15,878,131
Equity Linked Notes	—	440,812,673	—	440,812,673

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

56Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

	Level 1	Level 2	Level 3	Total
U.S. Government and Agency Obligations	$ —	$ 211,165,990	$ —	$ 211,165,990
Over The Counter (OTC) Put Options On Indices Purchased	—	640,089	—	640,089
Open-End Fund	11,368,367	—	—	11,368,367
Total Investments in Securities	$1,302,004,788	$1,168,591,122	$ 42,439,136	$2,513,035,046
Other Financial Instruments
Net unrealized depreciation on futures contracts	$ (18,268,085)	$ —	$ —	$ (18,268,085)
Total Other Financial Instruments	$ (18,268,085)	$ —	$ —	$ (18,268,085)

During the year ended July 31, 2023, there were no significant transfers in or out of Level 3.

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2357

Table of Contents

Statement of Assets and Liabilities | 7/31/23

ASSETS:
Investments in unaffiliated issuers, at value (cost $2,386,218,061)	$2,513,035,046
Cash	67,534
Foreign currencies, at value (cost $10,807)	12,226
Futures collateral	33,350,698
Variation margin for futures contracts	480,457
Receivables —
Investment securities sold	18,974,815
Fund shares sold	7,565,707
Dividends	4,398,817
Interest	11,051,863
Due from custodian	1,303,052
Other assets	41,934
Total assets	$ 2,590,282,149
LIABILITIES:
Payables —
Investment securities purchased	$ 15,040,134
Fund shares repurchased	12,440,054
Distributions	102,652
Trustees' fees	12,227
Collateral due to broker for options	850,000
Due to Adviser	8,220
Management fees	163,925
Administrative expenses	70,707
Distribution fees	53,284
Accrued expenses	729,755
Total liabilities	$ 29,470,958
NET ASSETS:
Paid-in capital	$2,692,127,064
Distributable earnings (loss)	(131,315,873)
Net assets	$ 2,560,811,191
NET ASSET VALUE PER SHARE:
No par value (unlimited number of shares authorized)
Class A (based on $492,295,318/43,478,533 shares)	$ 11.32
Class C (based on $268,091,420/23,769,029 shares)	$ 11.28
Class K (based on $119,557,685/10,273,646 shares)	$ 11.64
Class R (based on $1,140,359/100,753 shares)	$ 11.32
Class Y (based on $1,679,726,409/148,902,973 shares)	$ 11.28
MAXIMUM OFFERING PRICE PER SHARE:
Class A (based on $11.32 net asset value per share/100%-4.50% maximum sales charge)	$ 11.85

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

58Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Statement of Operations FOR THE YEAR ENDED 7/31/23

INVESTMENT INCOME:
Interest from unaffiliated issuers	$116,653,114
Dividends from unaffiliated issuers (net of foreign taxes withheld $3,326,348)	47,552,305
Total Investment Income		$ 164,205,419
EXPENSES:
Management fees	$ 10,410,148
Administrative expenses	674,596
Transfer agent fees
Class A	188,083
Class C	145,787
Class K	43
Class R	938
Class Y	1,365,371
Distribution fees
Class A	1,112,152
Class C	2,567,144
Class R	4,659
Shareowner communications expense	123,598
Custodian fees	128,123
Registration fees	257,794
Professional fees	233,967
Printing expense	40,937
Officers' and Trustees' fees	148,398
Insurance expense	20,710
Miscellaneous	414,403
Total expenses		$ 17,836,851
Less fees waived and expenses reimbursed by the Adviser		(246,915)
Net expenses		$ 17,589,936
Net investment income		$ 146,615,483
REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS:
Net realized gain (loss) on:
Investments in unaffiliated issuers	$ (61,147,869)
Futures contracts	(39,349,454)
Written options	376,889
Other assets and liabilities denominated in foreign currencies	(1,181,462)	$(101,301,896)
Change in net unrealized appreciation (depreciation) on:
Investments in unaffiliated issuers	$166,460,174
Futures contracts	(13,714,672)
Other assets and liabilities denominated in foreign currencies	473,295	$ 153,218,797
Net realized and unrealized gain (loss) on investments		$ 51,916,901
Net increase in net assets resulting from operations		$ 198,532,384

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2359

Table of Contents

Statements of Changes in Net Assets

	Year Ended 7/31/23	Year Ended 7/31/22
FROM OPERATIONS:
Net investment income (loss)	$ 146,615,483	$ 91,755,628
Net realized gain (loss) on investments	(101,301,896)	53,239,342
Change in net unrealized appreciation (depreciation) on investments	153,218,797	(157,366,269)
Net increase (decrease) in net assets resulting from operations	$ 198,532,384	$ (12,371,299)
DISTRIBUTIONS TO SHAREOWNERS:
Class A ($0.63 and $0.65 per share, respectively)	$ (25,497,137)	$ (21,882,630)
Class C ($0.55 and $0.56 per share, respectively)	(12,769,214)	(13,538,133)
Class K ($0.68 and $0.70 per share, respectively)	(6,960,933)	(7,891,529)
Class R ($0.60 and $0.59 per share, respectively)	(50,189)	(37,145)
Class Y ($0.65 and $0.67 per share, respectively)	(82,359,534)	(50,912,345)
Total distributions to shareowners	$ (127,637,007)	$ (94,261,782)
FROM FUND SHARE TRANSACTIONS:
Net proceeds from sales of shares	$1,255,867,301	$ 630,259,970
Reinvestment of distributions	126,852,760	92,674,086
Cost of shares repurchased	(651,211,343)	(431,048,442)
Net increase in net assets resulting from Fund share transactions	$ 731,508,718	$ 291,885,614
Net increase in net assets	$ 802,404,095	$ 185,252,533
NET ASSETS:
Beginning of year	$1,758,407,096	$1,573,154,563
End of year	$ 2,560,811,191	$ 1,758,407,096

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

60Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

	Year Ended 7/31/23 Shares	Year Ended 7/31/23 Amount	Year Ended 7/31/22 Shares	Year Ended 7/31/22 Amount
Class A
Shares sold	13,614,271	$ 150,475,084	10,942,592	$ 126,376,070
Reinvestment of distributions	2,296,769	25,299,143	1,874,970	21,526,503
Less shares repurchased	(9,220,100)	(101,358,676)	(6,588,391)	(75,511,992)
Net increase	6,690,940	$ 74,415,551	6,229,171	$ 72,390,581
Class C
Shares sold	5,901,728	$ 65,091,251	3,352,366	$ 38,380,079
Reinvestment of distributions	1,163,826	12,765,742	1,173,326	13,452,189
Less shares repurchased	(6,403,436)	(70,277,889)	(6,920,946)	(79,466,297)
Net increase (decrease)	662,118	$ 7,579,104	(2,395,254)	$ (27,634,029)
Class K
Shares sold	403,320	$ 4,615,552	2,997,657	$ 36,486,044
Reinvestment of distributions	609,865	6,900,872	648,245	7,672,877
Less shares repurchased	(1,256,261)	(14,155,284)	(4,739,246)	(56,362,194)
Net decrease	(243,076)	$ (2,638,860)	(1,093,344)	$ (12,203,273)
Class R
Shares sold	51,848	$ 568,684	28,656	$ 332,560
Reinvestment of distributions	4,534	49,942	3,209	36,773
Less shares repurchased	(27,662)	(304,868)	(15,037)	(175,230)
Net increase	28,720	$ 313,758	16,828	$ 194,103
Class Y
Shares sold	94,190,114	$1,035,116,730	37,651,330	$ 428,685,217
Reinvestment of distributions	7,445,204	81,837,061	4,372,212	49,985,744
Less shares repurchased	(42,488,849)	(465,114,626)	(19,319,152)	(219,532,729)
Net increase	59,146,469	$ 651,839,165	22,704,390	$ 259,138,232

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2361

Table of Contents

Financial Highlights

	Year Ended 7/31/23	Year Ended 7/31/22	Year Ended 7/31/21	Year Ended 7/31/20	Year Ended 7/31/19
Class A
Net asset value, beginning of period	$ 10.98	$ 11.67	$ 10.17	$ 10.79	$ 11.59
Increase (decrease) from investment operations:
Net investment income (loss) (a)	$ 0.73	$ 0.63	$ 0.65	$ 0.62	$ 0.62
Net realized and unrealized gain (loss) on investments	0.24	(0.67)	1.41	(0.60)	(0.80)
Net increase (decrease) from investment operations	$ 0.97	$ (0.04)	$ 2.06	$ 0.02	$ (0.18)
Distributions to shareowners:
Net investment income	$ (0.63)	$ (0.65)	$ (0.56)	$ (0.64)	$ (0.62)
Total distributions	$ (0.63)	$ (0.65)	$ (0.56)	$ (0.64)	$ (0.62)
Net increase (decrease) in net asset value	$ 0.34	$ (0.69)	$ 1.50	$ (0.62)	$ (0.80)
Net asset value, end of period	$ 11.32	$ 10.98	$ 11.67	$ 10.17	$ 10.79
Total return (b)	9.19%	(0.43)%	20.66%	0.28%	(1.56)%
Ratio of net expenses to average net assets	0.85%	0.85%	0.85%	0.85%	0.85%
Ratio of net investment income (loss) to average net assets	6.62%	5.51%	5.82%	6.01%	5.58%
Portfolio turnover rate	74%	73%	106%	126%	108%
Net assets, end of period (in thousands)	$492,295	$403,985	$356,626	$310,126	$377,722
Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly:
Total expenses to average net assets	0.86%	0.85%	0.88%	0.89%	0.89%
Net investment income (loss) to average net assets	6.61%	5.51%	5.79%	5.97%	5.54%

(a)	The per-share data presented above is based on the average shares outstanding for the period presented.
(b)	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.

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

62Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

	Year Ended 7/31/23	Year Ended 7/31/22	Year Ended 7/31/21	Year Ended 7/31/20	Year Ended 7/31/19
Class C
Net asset value, beginning of period	$ 10.94	$ 11.63	$ 10.13	$ 10.76	$ 11.56
Increase (decrease) from investment operations:
Net investment income (loss) (a)	$ 0.64	$ 0.54	$ 0.56	$ 0.54	$ 0.53
Net realized and unrealized gain (loss) on investments	0.25	(0.67)	1.41	(0.61)	(0.80)
Net increase (decrease) from investment operations	$ 0.89	$ (0.13)	$ 1.97	$ (0.07)	$ (0.27)
Distributions to shareowners:
Net investment income	$ (0.55)	$ (0.56)	$ (0.47)	$ (0.56)	$ (0.53)
Total distributions	$ (0.55)	$ (0.56)	$ (0.47)	$ (0.56)	$ (0.53)
Net increase (decrease) in net asset value	$ 0.34	$ (0.69)	$ 1.50	$ (0.63)	$ (0.80)
Net asset value, end of period	$ 11.28	$ 10.94	$ 11.63	$ 10.13	$ 10.76
Total return (b)	8.38%	(1.20)%	19.78%	(0.62)%	(2.33)%
Ratio of net expenses to average net assets	1.62%	1.61%	1.64%	1.65%	1.64%
Ratio of net investment income (loss) to average net assets	5.85%	4.72%	5.04%	5.20%	4.78%
Portfolio turnover rate	74%	73%	106%	126%	108%
Net assets, end of period (in thousands)	$268,091	$252,795	$296,575	$312,559	$422,863
Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly:
Total expenses to average net assets	1.62%	1.61%	1.64%	1.66%	1.65%
Net investment income (loss) to average net assets	5.85%	4.72%	5.04%	5.19%	4.77%

(a)	The per-share data presented above is based on the average shares outstanding for the period presented.
(b)	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.

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2363

Table of Contents

Financial Highlights (continued)

	Year Ended 7/31/23	Year Ended 7/31/22	Year Ended 7/31/21	Year Ended 7/31/20	Year Ended 7/31/19
Class K
Net asset value, beginning of period	$ 11.28	$ 12.02	$ 10.47	$ 11.12	$ 11.95
Increase (decrease) from investment operations:
Net investment income (loss) (a)	$ 0.78	$ 0.69	$ 0.70	$ 0.67	$ 0.67
Net realized and unrealized gain (loss) on investments	0.26	(0.73)	1.46	(0.63)	(0.83)
Net increase (decrease) from investment operations	$ 1.04	$ (0.04)	$ 2.16	$ 0.04	$ (0.16)
Distributions to shareowners:
Net investment income	$ (0.68)	$ (0.70)	$ (0.61)	$ (0.69)	$ (0.67)
Total distributions	$ (0.68)	$ (0.70)	$ (0.61)	$ (0.69)	$ (0.67)
Net increase (decrease) in net asset value	$ 0.36	$ (0.74)	$ 1.55	$ (0.65)	$ (0.83)
Net asset value, end of period	$ 11.64	$ 11.28	$ 12.02	$ 10.47	$ 11.12
Total return (b)	9.58%	(0.42)%	21.05%	0.44%	(1.32)%
Ratio of net expenses to average net assets	0.56%	0.55%	0.57%	0.58%	0.56%
Ratio of net investment income (loss) to average net assets	6.92%	5.79%	6.07%	6.30%	5.87%
Portfolio turnover rate	74%	73%	106%	126%	108%
Net assets, end of period (in thousands)	$119,558	$118,667	$139,556	$121,281	$125,831
Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly:
Total expenses to average net assets	0.56%	0.55%	0.57%	0.58%	0.57%
Net investment income (loss) to average net assets	6.92%	5.79%	6.07%	6.30%	5.86%

(a)	The per-share data presented above is based on the average shares outstanding for the period presented.
(b)	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.

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

64Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

	Year Ended 7/31/23	Year Ended 7/31/22	Year Ended 7/31/21	Year Ended 7/31/20	Year Ended 7/31/19
Class R
Net asset value, beginning of period	$10.98	$11.64	$10.19	$10.83	$11.64
Increase (decrease) from investment operations:
Net investment income (loss) (a)	$ 0.69	$ 0.59	$ 0.53	$ 0.53	$ 0.55
Net realized and unrealized gain (loss) on investments	0.25	(0.66)	1.40	(0.60)	(0.81)
Net increase (decrease) from investment operations	$ 0.94	$ (0.07)	$ 1.93	$ (0.07)	$ (0.26)
Distributions to shareowners:
Net investment income	$ (0.60)	$ (0.59)	$ (0.48)	$ (0.57)	$ (0.55)
Total distributions	$ (0.60)	$ (0.59)	$ (0.48)	$ (0.57)	$ (0.55)
Net increase (decrease) in net asset value	$ 0.34	$ (0.66)	$ 1.45	$ (0.64)	$ (0.81)
Net asset value, end of period	$11.32	$10.98	$11.64	$10.19	$10.83
Total return (b)	8.84%	(0.71)%	19.27%	0.57%	(2.22)%
Ratio of net expenses to average net assets	1.20%	1.18%	1.80%	1.63%	1.57%
Ratio of net investment income (loss) to average net assets	6.26%	5.18%	4.82%	5.13%	4.92%
Portfolio turnover rate	74%	73%	106%	126%	108%
Net assets, end of period (in thousands)	$1,140	$ 791	$ 643	$1,470	$ 835
Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly:
Total expenses to average net assets	1.20%	1.18%	1.80%	1.63%	1.59%
Net investment income (loss) to average net assets	6.26%	5.18%	4.82%	5.13%	4.90%

(a)	The per-share data presented above is based on the average shares outstanding for the period presented.
(b)	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.

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

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2365

Table of Contents

Financial Highlights (continued)

	Year Ended 7/31/23	Year Ended 7/31/22	Year Ended 7/31/21	Year Ended 7/31/20	Year Ended 7/31/19
Class Y
Net asset value, beginning of period	$ 10.94	$ 11.63	$ 10.13	$ 10.77	$ 11.57
Increase (decrease) from investment operations:
Net investment income (loss) (a)	$ 0.75	$ 0.65	$ 0.67	$ 0.64	$ 0.64
Net realized and unrealized gain (loss) on investments	0.24	(0.67)	1.41	(0.62)	(0.80)
Net increase (decrease) from investment operations	$ 0.99	$ (0.02)	$ 2.08	$ 0.02	$ (0.16)
Distributions to shareowners:
Net investment income	$ (0.65)	$ (0.67)	$ (0.58)	$ (0.66)	$ (0.64)
Total distributions	$ (0.65)	$ (0.67)	$ (0.58)	$ (0.66)	$ (0.64)
Net increase (decrease) in net asset value	$ 0.34	$ (0.69)	$ 1.50	$ (0.64)	$ (0.80)
Net asset value, end of period	$ 11.28	$ 10.94	$ 11.63	$ 10.13	$ 10.77
Total return (b)	9.42%	(0.24)%	20.97%	0.27%	(1.36)%
Ratio of net expenses to average net assets	0.65%	0.65%	0.65%	0.65%	0.65%
Ratio of net investment income (loss) to average net assets	6.80%	5.71%	6.01%	6.20%	5.83%
Portfolio turnover rate	74%	73%	106%	126%	108%
Net assets, end of period (in thousands)	$1,679,726	$982,169	$779,755	$586,958	$840,851
Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly:
Total expenses to average net assets	0.66%	0.66%	0.67%	0.68%	0.68%
Net investment income (loss) to average net assets	6.79%	5.70%	5.99%	6.17%	5.80%

(a)	The per-share data presented above is based on the average shares outstanding for the period presented.
(b)	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.

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

66Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Notes to Financial Statements | 7/31/23

1. Organization and Signiﬁcant Accounting Policies

Pioneer Multi-Asset Income Fund (the “Fund”) is one of four portfolios comprising Pioneer Series Trust IV (the "Trust"), a Delaware statutory trust. The Fund is registered under the Investment Company Act of 1940, as amended (the "1940 Act"), as a diversified, open-end management investment company. The investment objective of the Fund is to seek a high level of current income to the extent consistent with a relatively high level of stability of principal.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2367

Table of Contents

The following is a summary of signiﬁcant accounting policies followed by the Fund in the preparation of its ﬁnancial statements:

A.	Security Valuation
	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.
	Equity securities that have traded on an exchange are valued by using 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 or, if both last bid and asked prices are not available, at the last quoted bid price. Last sale and bid and asked prices are provided by independent third party pricing services. In the case of equity securities not traded on an exchange, prices are typically determined by independent third party pricing services using a variety of techniques and methods.

68Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

	The value of foreign securities is translated into U.S. dollars based on foreign currency exchange rate quotations supplied by a third party pricing source. Trading in non-U.S. equity securities is substantially completed each day at various times prior to the close of the NYSE. The values of such securities used in computing the net asset value of the Fund's shares are determined as of such times. The Adviser may use a fair value model developed by an independent pricing service to value non-U.S. equity securities.
	Equity-linked notes and fixed-income securities are valued by using 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, or may use a pricing matrix or other fair value methods or techniques to provide an estimated value of the security or instrument. A pricing matrix is a means of valuing a debt security on the basis of current market prices for other debt securities, historical trading patterns in the market for fixed-income securities and/or other factors. Non-U.S. debt securities that are listed on an exchange will be valued at the bid price obtained from an independent third party pricing service. When independent third party pricing services are unable to supply prices, or when prices or market quotations are considered to be unreliable, the value of that security may be determined using quotations from one or more broker-dealers.
	Loan interests are valued 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 third party 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.
	Event-linked bonds are valued at the bid price obtained from an independent third party pricing service. Other insurance-linked securities (including reinsurance sidecars, collateralized reinsurance and industry loss warranties) may be valued at the bid price obtained from an independent pricing service, or through a third party using a pricing matrix, insurance valuation models, or other fair value methods or techniques to provide an estimated value of the instrument.
	Options contracts are generally valued at the mean between the last bid and ask prices on the principal exchange where they are traded. Over-the-counter (“OTC”) options and options on swaps (“swaptions”) are

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2369

Table of Contents

	valued using prices supplied by independent pricing services, which consider suchfactors as market prices, market events, quotations from one or more brokers, Treasury spreads, yields, maturities and ratings, or may use a pricing matrix or other fair value methods or techniques to provide an estimated value of the security or instrument.
	Forward foreign currency exchange contracts are valued daily using the foreign exchange rate or, for longer term forward contract positions, the spot currency rate and the forward points on a daily basis, in each case provided by a third party pricing service. Contracts whose forward settlement date falls between two quoted days are valued by interpolation.
	Futures contracts are generally valued at the closing settlement price established by the exchange on which they are traded.
	Shares of open-end registered investment companies (including money market mutual funds) are valued at such funds’ net asset value. Shares of exchange-listed closed-end funds are valued by using the last sale price on the principal exchange where they are traded.
	Repurchase agreements are valued at par. Cash may include overnight time deposits at approved financial institutions.
	Securities or loan interests for which independent pricing services or broker-dealers 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 the Adviser. The Adviser is designated as the valuation designee for the Fund pursuant to Rule 2a-5 under the 1940 Act. The Adviser’s fair valuation team is responsible for monitoring developments that may impact fair valued securities.
	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 Adviser 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.

70Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

B.	Investment Income and Transactions
	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 and net of income accrued on defaulted securities.
	Interest and dividend income payable by delivery of additional shares is reclassified as PIK (payment-in-kind) income upon receipt and is included in interest and dividend income, respectively.
	Principal amounts of mortgage-backed securities 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 purchase prices of 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.
	Security transactions are recorded as of trade date. Gains and losses on sales of investments are calculated on the identified cost method for both financial reporting and federal income tax purposes.
C.	Foreign Currency Translation
	The books and records of the Fund are maintained in U.S. dollars. Amounts denominated in foreign currencies are translated into U.S. dollars using current exchange rates.
	Net realized gains and losses on foreign currency transactions, if any, represent, among other things, the net realized gains and losses on foreign currency exchange contracts, disposition of foreign currencies and the difference between the amount of income accrued and the U.S. dollars actually received. Further, the effects of changes in foreign currency exchange rates on investments are not segregated on the Statement of Operations from the effects of changes in the market prices of those securities, but are included with the net realized and unrealized gain or loss on investments.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2371

Table of Contents

D.	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 net taxable income and net realized capital gains, if any, to its shareowners. Therefore, no provision for federal income taxes is required. As of July 31, 2023, 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 on the Statement of Operations. Tax returns filed within the prior three years remain subject to examination by federal and state tax authorities.
	In determining the daily net asset value, the Fund estimates the reserve for the repatriation of taxes, if any, associated with its investments in certain countries. The estimated reserve for capital gains is based on the net unrealized appreciation on certain portfolio securities, the holding period of such securities and the related tax rates, tax loss carryforwards (if applicable) and other such factors. As of July 31, 2023, the Fund has not accrued any reserve for repatriation taxes related to capital gains.
	A portion of the dividend income recorded by the Fund is from distributions by publicly traded real estate investment trusts (“REITs”), and such distributions for tax purposes may also consist of capital gains and return of capital. The actual return of capital and capital gains portions of such distributions will be determined by formal notifications from the REITs subsequent to the calendar year-end. Distributions received from the REITs that are determined to be a return of capital are recorded by the Fund as a reduction of the cost basis of the securities held and those determined to be capital gain are reflected as such on the Statement of Operations.
	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. GAAP. Distributions in excess of net investment income or net realized gains are temporary over distributions 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.
	At July 31, 2023, the Fund reclassified $3,687 to increase distributable earnings and $3,687 to decrease paid-in capital to reflect permanent book/tax differences. These adjustments have no impact on net assets or the results of operations.

72Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

	At July 31, 2023, the Fund was permitted to carry forward indefinitely $126,592,797 of short-term losses and $153,670,087 of long-term losses.
	The tax character of distributions paid during the years ended July 31, 2023 and July 31, 2022, was as follows:

	2023	2022
Distributions paid from:
Ordinary income	$127,637,007	$94,261,782
Total	$ 127,637,007	$94,261,782

The following shows the components of distributable earnings (losses) on a federal income tax basis at July 31, 2023:

	2023
Distributable earnings/(losses):
Undistributed ordinary income	$ 24,235,809
Capital loss carryforward	(280,262,884)
Other book/tax temporary differences	13,009,808
Net unrealized appreciation	111,701,394
Total	$(131,315,873)

The difference between book-basis and tax-basis net unrealized appreciation is attributable to the tax deferral of losses on wash sales, realization for tax purposes of unrealized gains on investments in passive foreign investment companies and the book/tax differences in the adjustments relating to insurance-linked securities, the tax treatment of premium and amortization, accrual of income on securities in default, the mark to market of futures contracts, and tax basis adjustments on partnership holdings.

E.	Fund Shares
	The Fund records sales and repurchases of its shares as of trade date. The Distributor earned $199,252 in underwriting commissions on the sale of Class A shares during the year ended July 31, 2023.
F.	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 C and Class R shares of the Fund, respectively (see Note 5). Class K and Class Y shares do not pay distribution fees. All expenses and fees paid to the Fund's transfer agent

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2373

Table of Contents

	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 4).
	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 C, Class K, Class R and Class Y shares can reflect different transfer agent and distribution expense rates.
G.	Risks
	The value of securities held by the Fund may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic, political or regulatory conditions, recessions, the spread of infectious illness or other public health issues, inflation, changes in interest rates, armed conflict including Russia's military invasion of Ukraine, sanctions against Russia, other nations or individuals or companies and possible countermeasures, lack of liquidity in the bond markets or adverse investor sentiment. In the past several years, financial markets have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. These conditions may continue, recur, worsen or spread. Inflation and interest rates have increased and may rise further. These circumstances could adversely affect the value and liquidity of the Fund's investments and negatively impact the Fund's performance.
	The long-term impact of the COVID-19 pandemic and its subsequent variants on economies, markets, industries and individual issuers, are not known. Some sectors of the economy and individual issuers have experienced or may experience particularly large losses. Periods of extreme volatility in the financial markets, reduced liquidity of many instruments, increased government debt, inflation, and disruptions to supply chains, consumer demand and employee availability, may continue for some time. Following Russia's invasion of Ukraine, Russian securities lost all, or nearly all, their market value. Other securities or markets could be similarly affected by past or future political, geopolitical or other events or conditions.

74Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

	Governments and central banks, including the U.S. Federal Reserve, have taken extraordinary and unprecedented actions to support local and global economies and the financial markets. These actions have resulted in significant expansion of public debt, including in the U.S. The consequences of high public debt, including its future impact on the economy and securities markets, may not be known for some time.
	The U.S. and other countries are periodically involved in disputes over trade and other matters, which may result in tariffs, investment restrictions and adverse impacts on affected companies and securities. For example, the U.S. has imposed tariffs and other trade barriers on Chinese exports, has restricted sales of certain categories of goods to China, and has established barriers to investments in China. Trade disputes may adversely affect the economies of the U.S. and its trading partners, as well as companies directly or indirectly affected and financial markets generally. If the political climate between the U.S. and China does not improve or continues to deteriorate, if China were to attempt unification of Taiwan by force, or if other geopolitical conflicts develop or get worse, economies, markets and individual securities may be severely affected both regionally and globally, and the value of the Fund's assets may go down.
	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 investments in foreign markets and countries with limited developing markets may subject the Fund to a greater degree of risk than investments in a developed market. These risks include disruptive political or economic conditions, military conflicts and sanctions, terrorism, sustained economic downturns, financial instability, less liquid trading markets, extreme price volatility, currency risks, reduction of government or central bank support, inadequate accounting standards, tariffs, tax disputes or other tax burdens, nationalization or expropriation of assets and the imposition of adverse governmental laws, arbitrary application of laws and regulations or lack of rule of law and investment and repatriation restrictions. Lack of information and less market regulation also may affect the value of these securities. Withholding and other non-U.S. taxes may decrease the Fund’s return. Non-U.S. issuers may be located in parts of the world that have historically been prone to natural disasters. Investing in depositary receipts is subject to many of the same risks as investing directly in non-U.S. issuers. Depositary receipts may involve higher expenses and may trade at a discount (or premium) to the underlying security.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2375

Table of Contents

	Russia launched a large-scale invasion of Ukraine on February 24, 2022. In response to the military action by Russia, various countries, including the U.S., the United Kingdom, and European Union issued broad-ranging economic sanctions against Russia and Belarus and certain companies and individuals. Since then, Russian securities have lost all, or nearly all, their market value, and many other issuers, securities and markets have been adversely affected. The United States and other countries may impose sanctions on other countries, companies and individuals in light of Russia’s military invasion. The extent and duration of the military action or future escalation of such hostilities, the extent and impact of existing and future sanctions, market disruptions and volatility, and the result of any diplomatic negotiations cannot be predicted. These and any related events could have a significant impact on the value and liquidity of certain Fund investments, on Fund performance and the value of an investment in the Fund, particularly with respect to securities and commodities, such as oil, natural gas and food commodities, as well as other sectors with exposure to Russian issuers or issuers in other countries affected by the invasion, and are likely to have collateral impacts on market sectors globally.
	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.
	The Fund invests at least 80% of it's total asset in below-investment-grade (high-yield) debt securities. Some of these high-yield securities may be convertible into equity securities of the issuer. Debt securities rated below-investment-grade are commonly referred to as “junk bonds” and are considered speculative with respect to the issuer’s capacity to pay interest and repay principal. These securities involve greater risk of loss, are subject to greater price volatility, and may be less liquid and more difficult to value, especially during periods of economic uncertainty or change, than higher rated debt securities.
	The Fund's investments, payment obligations and financing terms may be based on floating rates, such as LIBOR (London Interbank Offered Rate) or SOFR (Secured Overnight Financing Rate). ICE Benchmark Administration, the administrator of LIBOR, has ceased publication of most LIBOR settings on a representative basis. Actions by regulators have resulted in the establishment of alternative reference rates to LIBOR in most major currencies. In the U.S., a common benchmark replacement is based on the SOFR published by the Federal Reserve Bank of New York, including certain spread adjustments and benchmark replacement conforming changes, although other benchmark

76Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

	replacements (without or without spread adjustments) may be used in certain transactions. The impact of the transition from LIBOR on the Fund's transactions and financial markets generally cannot yet be determined. The transition away from LIBOR may lead to increased volatility and illiquidity in markets for instruments that have relied on LIBOR and may adversely affect the Fund's performance.
	The Fund may invest in equity-linked notes (ELNs). ELNs may not perform as expected and could cause the fund to realize significant losses including its entire principal investment. Investments in ELNs often have risks similar to their underlying securities, which may include market risk and, as applicable, risks of non-U.S. investments and currency risks. In addition, since ELNs are in note form, ELNs are also subject to certain risks of fixed income securities, such as interest rate and credit risks. Investments in ELNs are also subject to liquidity risk, which may make ELNs difficult to sell and value. In addition, ELNs may exhibit price behavior that does not correlate with the underlying securities or a fixed income investment.
	The Fund may invest in REIT securities, the value of which can fall for a variety of reasons, such as declines in rental income, fluctuating interest rates, poor property management, environmental liabilities, uninsured damage, increased competition, or changes in real estate tax laws.
	With the increased use of technologies such as the Internet to conduct business, the Fund is susceptible to operational, information security and related risks. While the Fund’s Adviser has established business continuity plans in the event of, and risk management systems to prevent, limit or mitigate, such cyber-attacks, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund such as the Fund’s custodian and accounting agent, and the Fund’s transfer agent. In addition, many beneficial owners of Fund shares hold them through accounts at broker-dealers, retirement platforms and other financial market participants over which neither the Fund nor the Adviser exercises control. Each of these may in turn rely on service providers to them, which are also subject to the risk of cyber-attacks. Cybersecurity failures or breaches at the Adviser or the Fund’s service providers or intermediaries have the ability to cause disruptions and impact business operations, potentially resulting in financial losses, interference with the Fund’s ability to calculate its net asset value, impediments to trading, the inability of Fund shareowners to effect share purchases, redemptions or exchanges or receive distributions, loss of or unauthorized access to private

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2377

Table of Contents

	shareowner information and violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, or additional compliance costs. Such costs and losses may not be covered under any insurance. In addition, maintaining vigilance against cyber-attacks may involve substantial costs over time, and system enhancements may themselves be subject to cyber-attacks.
	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.
H.	Restricted Securities
	Restricted Securities are subject to legal or contractual restrictions on resale. Restricted securities generally are resold in transactions exempt from registration under the Securities Act of 1933. Private placement securities are generally considered to be restricted except for those securities traded between qualiﬁed institutional investors under the provisions of Rule 144A of the Securities Act of 1933.
	Disposal of restricted investments may involve negotiations and expenses, and prompt sale at an acceptable price may be difﬁcult to achieve. Restricted investments held by the Fund at July 31, 2023 are listed in the Schedule of Investments.
I.	Insurance-Linked Securities (“ILS”)
	The Fund invests in ILS. The Fund could lose a portion or all of the principal it has invested in an ILS, and the right to additional interest or dividend payments with respect to the security, upon the occurrence of one or more trigger events, as deﬁned within the terms of an insurance-linked security. Trigger events, generally, are hurricanes, earthquakes, or other natural events of a speciﬁc size or magnitude that occur in a designated geographic region during a speciﬁed time period, and/or that involve losses or other metrics that exceed a speciﬁc amount. There is no way to accurately predict whether a trigger event will occur, and accordingly, ILS carry signiﬁcant risk. The Fund is entitled to receive principal, and interest and/or dividend payments so long as no trigger event occurs of the description and magnitude speciﬁed by the instrument. In addition to the speciﬁed trigger events, ILS may expose the Fund to other risks, including but not limited to issuer (credit) default, adverse regulatory or jurisdictional interpretations and adverse tax consequences.
	The Fund’s investments in ILS may include event-linked bonds. ILS also may include special purpose vehicles (“SPVs”) or similar instruments

78Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

	structured to comprise a portion of a reinsurer’s catastrophe-oriented business, known as quota share instruments (sometimes referred to as reinsurance sidecars), or to provide reinsurance relating to speciﬁc risks to insurance or reinsurance companies through a collateralized instrument, known as collateralized reinsurance. Structured reinsurance investments also may include industry loss warranties (“ILWs”). A traditional ILW takes the form of a bilateral reinsurance contract, but there are also products that take the form of derivatives, collateralized structures, or exchange-traded instruments.
	Where the ILS are based on the performance of underlying reinsurance contracts, the Fund has limited transparency into the individual underlying contracts, and therefore must rely upon the risk assessment and sound underwriting practices of the issuer. Accordingly, it may be more difficult for the Adviser to fully evaluate the underlying risk profile of the Fund's structured reinsurance investments, and therefore the Fund's assets are placed at greater risk of loss than if the Adviser had more complete information. Structured reinsurance instruments generally will be considered illiquid securities by the Fund. These securities may be difficult to purchase, sell or unwind. Illiquid securities also may be difficult to value. If the Fund is forced to sell an illiquid asset, the Fund may be forced to sell at a loss.
J.	Repurchase Agreements
	Repurchase agreements are arrangements under which the Fund purchases securities from a broker-dealer or a bank, called the counterparty, upon the agreement of the counterparty to repurchase the securities from the Fund at a later date, and at a specific price, which is typically higher than the purchase price paid by the Fund. The securities purchased serve as the Fund’s collateral for the obligation of the counterparty to repurchase the securities. The value of the 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 sub-custodian of the Fund. The Adviser is responsible for determining that the value of the collateral remains at least equal to the repurchase price. In the event of a default by the counterparty, the Fund is entitled to sell the securities, but the Fund may not be able to sell them for the price at which they were purchased, thus causing a loss to the Fund. Additionally, if the counterparty becomes insolvent, there is some risk that the Fund will not have a right to the securities, or the immediate right to sell the securities.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2379

Table of Contents

	For the year ended July 31, 2023, the Fund had no open repurchase agreements.
K.	Purchased Options
	The Fund may purchase put and call options to seek to increase total return. Purchased call and put options entitle the Fund to buy and sell a specified number of shares or units of a particular security, currency or index at a specified price at a specific date or within a specific period of time. Upon the purchase of a call or put option, the premium paid by the Fund is included on the Statement of Assets and Liabilities as an investment. All premiums are marked-to-market daily, and any unrealized appreciation or depreciation is recorded on the Fund’s Statement of Operations. As the purchaser of an index option, the Fund has the right to receive a cash payment equal to any depreciation in the value of the index below the strike price of the option (in the case of a put) or equal to any appreciation in the value of the index over the strike price of the option (in the case of a call) as of the valuation date of the option. Premiums paid for purchased call and put options which have expired are treated as realized losses on investments on the Statement of Operations. Upon the exercise or closing of a purchased put option, the premium is offset against the proceeds on the sale of the underlying security or financial instrument in order to determine the realized gain or loss on investments. Upon the exercise or closing of a purchased call option, the premium is added to the cost of the security or financial instrument. The risk associated with purchasing options is limited to the premium originally paid.
	The average market value of purchased options contracts open during the year ended July 31, 2023 was $128,018. Open purchased options contracts at July 31, 2023 are listed in the Schedule of Investments.
L.	Option Writing
	The Fund may write put and covered call options to seek to increase total return. When an option is written, the Fund receives a premium and becomes obligated to purchase or sell the underlying security at a fixed price, upon the exercise of the option. When the Fund writes an option, an amount equal to the premium received by the Fund is recorded as “Written options outstanding” on the Statement of Assets and Liabilities and is subsequently adjusted to the current value of the option written. Premiums received from writing options that expire unexercised are treated by the Fund on the expiration date as realized gains from investments on the Statement of Operations. The difference between the premium and the amount paid on effecting a closing

80Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

	purchase transaction, including brokerage commissions, is also treated as a realized gain on the Statement of Operations, or, if the premium is less than the amount paid for the closing purchase transaction, as a realized loss on the Statement of Operations. If a call option is exercised, the premium is added to the proceeds from the sale of the underlying security in determining whether the Fund has realized a gain or loss. The Fund as writer of an option bears the market risk of an unfavorable change in the price of the security underlying the written option.
	The average market value of written options contracts for the year ended July 31, 2023 was $(9,085). There were no open written options contracts at July 31, 2023.
M.	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 July 31, 2023, is recorded as “Futures collateral” on the Statement of Assets and Liabilities.
	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. Cash received from or paid to the broker related to previous margin movement is held in a segregated account at the broker and is recorded as either "Due from broker for futures" or "Due to broker for futures" on the Statement of Assets and Liabilities. 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. 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. With futures, there is reduced counterparty credit risk to the Fund since futures are exchange-traded and the exchange's clearinghouse, as counterparty to all exchange-traded futures, guarantees the futures against default.
	The average notional values of futures contracts long position and futures contracts short position during the year ended July 31, 2023 were

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2381

Table of Contents

	$29,623,725 and $470,377,707, respectively. Open futures contracts outstanding at July 31, 2023 are listed in the Schedule of Investments.
N.	Equity-Linked Notes
	Equity-linked notes seek to generate income and provide exposure to the performance of an underlying security, group of securities or exchange-traded funds (the “underlying reference instrument”). In an equity-linked note, the Fund purchases a note from a bank or broker-dealer and in return, the issuer provides for interest payments during the term of the note. At maturity or when the security is sold, the Fund will either settle by taking physical delivery of the underlying reference instrument or by receipt of a cash settlement amount equal to the value of the note at termination or maturity. The use of equity-linked notes involves the risk that the value of the note changes unfavorably due to movements in the value of the underlying reference instrument. Equity-linked notes are considered general unsecured contractual obligations of the bank or broker-dealer. The Fund must rely on the creditworthiness of the issuer for its investment returns.

2. Management Agreement

The Adviser manages the Fund’s portfolio. Management fees payable under the Fund's Investment Management Agreement with the Adviser are calculated daily and paid monthly at the annual rate of 0.50% of the Fund’s average daily net assets up to $1 billion, 0.45% of the next $4 billion and 0.40% on assets over $5 billion. For the year ended July 31, 2023, the effective management fee (excluding waivers and/or assumption of expenses) was equivalent to 0.47% of the Fund’s average daily net assets.

The 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) of the Fund to the extent required to reduce Fund expenses to 0.85% and 0.65% of the average daily net assets attributable to Class A and Class Y shares, respectively. These expense limitations are in effect through December 1, 2023. There can be no assurance that the Adviser will extend the expense limitation agreement for a class of shares beyond the date referred to above. Fees waived and expenses reimbursed during the year ended July 31, 2023, are reflected on the Statement of Operations.

82Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

reimbursements. Reflected on the Statement of Assets and Liabilities is $163,925 in management fees payable to the Adviser at July 31, 2023.

3. Compensation of Officers and Trustees

The Fund pays an annual fee to its Trustees. The Adviser reimburses the Fund for fees paid to the Interested Trustees. Except for the chief compliance officer, the Fund does not pay any salary or other compensation to its officers. The Fund pays a portion of the chief compliance officer's compensation for his services as the Fund's chief compliance officer. Amundi US pays the remaining portion of the chief compliance officer's compensation. For the year ended July 31, 2023, the Fund paid $148,398 in Officers' and Trustees' compensation, which is reflected on the Statement of Operations as Officers' and Trustees' fees. At July 31, 2023, on its Statement of Assets and Liabilities, the Fund had a payable for Trustees' fees of $12,227 and a payable for administrative expenses of $70,707, which includes the payable for Officers' compensation.

4. Transfer Agent

Shareowner Communications:
Class A	$ 26,398
Class C	16,595
Class K	195
Class R	383
Class Y	80,027
Total	$123,598

5. Distribution and Service Plans

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2383

Table of Contents

Pursuant to the Plan, the Fund also pays the Distributor 1.00% of the average daily net assets attributable to Class C shares. The fee for 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 C shares. Pursuant to the Plan, the Fund further pays the Distributor 0.50% of the average daily net assets attributable to Class R shares for distribution services. Reflected on the Statement of Assets and Liabilities is $53,284 in distribution fees payable to the Distributor at July 31, 2023.

6. Line of Credit Facility

84Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

allocation schedule set forth in the credit agreement. For the year ended July 31, 2023, the Fund had no borrowings under the credit facility.

7. Master Netting Agreements

The Fund has entered into an International Swaps and Derivatives Association, Inc. Master Agreement (“ISDA Master Agreement”) or similar agreement with substantially all of its derivative counterparties. An ISDA Master Agreement is a bilateral agreement between the Fund and a counterparty that governs the trading of certain Over the Counter (“OTC”) derivatives and typically contains, among other things, close-out and set- off provisions which apply upon the occurrence of an event of default and/or a termination event as deﬁned under the relevant ISDA Master Agreement. The ISDA Master Agreement may also give a party the right to terminate all transactions traded under such agreement if, among other things, there is deterioration in the credit quality of the other party.

Upon an event of default or a termination of the ISDA Master Agreement, the non-defaulting party has the right to close-out all transactions under such agreement and to net amounts owed under each transaction to determine one net amount payable by one party to the other. The right to close out and net payments across all transactions under the ISDA Master Agreement could result in a reduction of the Fund’s credit risk to its counterparty equal to any amounts payable by the Fund under the applicable transactions, if any. However, the Fund’s right to set-off may be restricted or prohibited by the bankruptcy or insolvency laws of the particular jurisdiction to which each speciﬁc ISDA Master Agreement of each counterparty is subject.

The collateral requirements for derivatives transactions under an ISDA Master Agreement are governed by a credit support annex to the ISDA Master Agreement. Collateral requirements are generally determined at the close of business each day and are typically based on changes in market values for each transaction under an ISDA Master Agreement and netted into one amount for such agreement. Generally, the amount of collateral due from or to a counterparty is subject to threshold (a “minimum transfer amount”) before a transfer is required, which may vary by counterparty. Collateral pledged for the beneﬁt of the Fund and/or counterparty is held in segregated accounts by the Fund’s custodian and cannot be sold, re- pledged, assigned or otherwise used while pledged. Cash that has been segregated to cover the Fund’s collateral obligations, if any, will be reported separately on the Statement of Assets and Liabilities as “Swaps collateral”. Securities pledged by the Fund as collateral, if any, are identiﬁed as such in the Schedule of Investments.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2385

Table of Contents

Financial instruments subject to an enforceable master netting agreement, such as an ISDA Master Agreement, have been offset on the Statement of Assets and Liabilities. The following charts show gross assets and liabilities of the Fund as of July 31, 2023.

Counterparty	Derivative Assets Subject to Master Netting Agreement	Derivatives Available for Offset	Non-Cash Collateral Received (a)	Cash Collateral Received (a)	Net Amount of Derivative Assets (b)
Citibank NA	$640,089	$—	$—	$(640,089)	$—

Counterparty	Derivative Liabilities Subject to Master Netting Agreement	Derivatives Available for Offset	Non-Cash Collateral Pledged (a)	Cash Collateral Pledged (a)	Net Amount of Derivative Liabilities (c)
Citibank NA	$—	$—	$—	$—	$—

(a) The amount presented here may be less than the total amount of collateral received/pledged as the net amount of derivative assets and liabilities cannot be less than $0.

(b) Represents the net amount due from the counterparty in the event of default.

8. Additional Disclosures about Derivative Instruments and Hedging Activities

The Fund’s use of derivatives may enhance or mitigate the Fund’s exposure to the following risks:

Interest rate risk relates to the ﬂuctuations in the value of interest-bearing securities due to changes in the prevailing levels of market interest rates.

Credit risk relates to the ability of the issuer of a ﬁnancial instrument to make further principal or interest payments on an obligation or commitment that it has to the Fund.

Foreign exchange rate risk relates to ﬂuctuations in the value of an asset or liability due to changes in currency exchange rates.

86Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

The fair value of open derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) by risk exposure at July 31, 2023, was as follows:

Statement of Assets and Liabilities	Interest Rate Risk	Credit Risk	Foreign Exchange Rate Risk	Equity Risk	Commodity Risk
Assets
Net unrealized appreciation on futures contracts^	$1,383,114	$ —	$ —	$ 1,664,291	$ —
Options purchased*	—	—	—	640,089	—
Total Value	$1,383,114	$—	$—	$ 2,304,380	$—
Liabilities
Net unrealized depreciation on futures contracts^	$ —	$ —	$ —	$21,315,490	$ —
Total Value	$ —	$—	$—	$21,315,490	$—


^	Includes cumulative unrealized appreciation (depreciation) of futures contracts as reported in the Schedule of Investments. Only net variation margin is reported within the assets and/or liabilities on the Statement of Assets and Liabilities.
*	Reflects the market value of purchased option contracts (see Note 1K). These amounts are included in investments in unaffiliated issuers, at value, on the Statement of Assets and Liabilities.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2387

Table of Contents

The effect of derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) on the Statement of Operations by risk exposure at July 31, 2023 was as follows:

Statement of Operations	Interest Rate Risk	Credit Risk	Foreign Exchange Rate Risk	Equity Risk	Commodity Risk
Net Realized Gain (Loss) on
Futures contracts	$ (3,091,153)	$ —	$ —	$ (36,258,301)	$ —
Options purchased*	—	—	—	1,317,890	—
Options written	—	—	—	376,889	—
Total Value	$(3,091,153)	$—	$—	$(34,563,522)	$—
Change in Net Unrealized Appreciation (Depreciation) on
Futures contracts	$ 2,013,593	$ —	$ —	$ (15,728,265)	$ —
Options purchased**	—	—	—	(3,352,335)	—
Total Value	$ 2,013,593	$—	$—	$ (19,080,600)	$—


*	Reflects the net realized gain (loss) on purchased option contracts (see Note 1K). These amounts are included in net realized gain (loss) on investments in unaffiliated issuers, on the Statement of Operations.
**	Reflects the change in net unrealized appreciation (depreciation) on purchased option contracts (see Note 1K). These amounts are included in change in net unrealized appreciation (depreciation) on investments in unaffiliated issuers, on the Statement of Operations.

88Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Report of Independent Registered Public Accounting Firm

To the Board of Trustees of Pioneer Series Trust IV and the Shareholders of Pioneer Multi-Asset Income Fund:

Opinion on the Financial Statements

We have audited the accompanying statement of assets and liabilities of Pioneer Multi-Asset Income Fund (the “Fund”) (one of the funds constituting Pioneer Series Trust IV (the “Trust”)), including the schedule of investments, as of July 31, 2023, and the related statement of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, the financial highlights for each of the five years in the period then ended and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Fund (one of the funds constituting Pioneer Series Trust IV) at July 31, 2023, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended, and its financial highlights for each of the five years in the period then ended in conformity with U.S. generally accepted accounting principles.

Basis for Opinion

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2389

Table of Contents

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our procedures included confirmation of securities owned as of July 31, 2023,by correspondence with the custodian, brokers and others; when replies were not received from brokers and others, we performed other auditing procedures. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

We have served as the auditor of one or more investment companies in the Pioneer family of funds since 2017.

Boston, Massachusetts
September 29, 2023

90Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Additional Information (unaudited)

The qualifying percentage of the Fund’s ordinary income dividends for the purpose of the corporate dividends received deduction was 8.80%.

Qualified interest income is exempt from nonresident alien (NRA) tax withholding. The percentage of the Fund’s ordinary income distributions derived from qualified interest income was 61.46%.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2391

Table of Contents

Statement Regarding Liquidity Risk Management Program

The Report discussed the Committee’s annual review of the Program, which addressed, among other things, the following elements of the Program:

92Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23 93

Table of Contents

Trustees, Officers and Service Providers

Investment Adviser and Administrator
Amundi Asset Management US, Inc.

Custodian and Sub-Administrator
The Bank of New York Mellon Corporation

Independent Registered Public Accounting Firm
Ernst & Young LLP

Principal Underwriter
Amundi Distributor US, Inc.

Legal Counsel
Morgan, Lewis & Bockius LLP

Transfer Agent
BNY Mellon Investment Servicing (US) Inc.

Trustees and Officers

The Statement of Additional Information of the Fund includes additional information about the Directors and is available, without charge, upon request, by calling 1-800-225-6292.

94Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Independent Trustees

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Thomas J. Perna (72) Chairman of the Board and Trustee	Trustee since 2011. Serves until a successor trustee is elected or earlier retirement or removal.	Private investor (2004 – 2008 and 2013 – present); Chairman (2008 – 2013) and Chief Executive Officer (2008 – 2012), Quadriserv, Inc. (technology products for securities lending industry); and Senior Executive Vice President, The Bank of New York (financial and securities services) (1986 – 2004)	Director, Broadridge Financial Solutions, Inc. (investor communications and securities processing provider for financial services industry) (2009 – present); Director, Quadriserv, Inc. (2005 – 2013); and Commissioner, New Jersey State Civil Service Commission (2011 – 2015)
John E. Baumgardner, Jr. (72)* Trustee	Trustee since 2019. Serves until a successor trustee is elected or earlier retirement or removal.	Of Counsel (2019 – present), Partner (1983-2018), Sullivan & Cromwell LLP (law firm).	Chairman, The Lakeville Journal Company, LLC, (privately-held community newspaper group) (2015-present)
Diane Durnin (66) Trustee	Trustee since 2019. Serves until a successor trustee is elected or earlier retirement or removal.	Managing Director - Head of Product Strategy and Development, BNY Mellon Investment Management (investment management firm) (2012-2018); Vice Chairman – The Dreyfus Corporation (2005 – 2018): Executive Vice President Head of Product, BNY Mellon Investment Management (2007-2012); Executive Director- Product Strategy, Mellon Asset Management (2005-2007); Executive Vice President Head of Products, Marketing and Client Service, Dreyfus Corporation (investment management firm) (2000-2005); Senior Vice President Strategic Product and Business Development, Dreyfus Corporation (1994-2000)	None
* Mr. Baumgardner is Of Counsel to Sullivan & Cromwell LLP, which acts as counsel to the Independent Trustees of each Pioneer Fund.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2395

Table of Contents

Independent Trustees (continued)

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Benjamin M. Friedman (78) Trustee	Trustee since 2011. Serves until a successor trustee is elected or earlier retirement or removal.	William Joseph Maier Professor of Political Economy, Harvard University (1972 – present)	Trustee, Mellon Institutional Funds Investment Trust and Mellon Institutional Funds Master Portfolio (oversaw 17 portfolios in fund complex) (1989 - 2008)
Craig C. MacKay (60) Trustee	Trustee since 2021. Serves until a successor trustee is elected or earlier retirement or removal.	Partner, England & Company, LLC (advisory firm) (2012 – present); Group Head – Leveraged Finance Distribution, Oppenheimer & Company (investment bank) (2006 – 2012); Group Head – Private Finance & High Yield Capital Markets Origination, SunTrust Robinson Humphrey (investment bank) (2003 – 2006); and Founder and Chief Executive Officer, HNY Associates, LLC (investment bank) (1996 – 2003)	Director, Equitable Holdings, Inc. (financial services holding company) (2022 – present); Board Member of Carver Bancorp, Inc. (holding company) and Carver Federal Savings Bank, NA (2017 – present); Advisory Council Member, MasterShares ETF (2016 – 2017); Advisory Council Member, The Deal (financial market information publisher) (2015 – 2016); Board Co-Chairman and Chief Executive Officer, Danis Transportation Company (privately-owned commercial carrier) (2000 – 2003); Board Member and Chief Financial Officer, Customer Access Resources (privately-owned teleservices company) (1998 – 2000); Board Member, Federation of Protestant Welfare Agencies (human services agency) (1993 – present); and Board Treasurer, Harlem Dowling Westside Center (foster care agency) (1999 – 2018)

96Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Lorraine H. Monchak (67) Trustee	Trustee since 2017. (Advisory Trustee from 2014 - 2017). Serves until a successor trustee is elected or earlier retirement or removal.	Chief Investment Officer, 1199 SEIU Funds (healthcare workers union pension funds) (2001 – present); Vice President – International Investments Group, American International Group, Inc. (insurance company) (1993 – 2001); Vice President – Corporate Finance and Treasury Group, Citibank, N.A. (1980 – 1986 and 1990 – 1993); Vice President – Asset/Liability Management Group, Federal Farm Funding Corporation (government-sponsored issuer of debt securities) (1988 – 1990); Mortgage Strategies Group, Shearson Lehman Hutton, Inc. (investment bank) (1987 – 1988); Mortgage Strategies Group, Drexel Burnham Lambert, Ltd. (investment bank) (1986 – 1987)	None
Marguerite A. Piret (75) Trustee	Trustee since 2011. Serves until a successor trustee is elected or earlier retirement or removal.	Chief Financial Officer, American Ag Energy, Inc. (technology for the environment, energy and agriculture) (2019 – present); Chief Operating Officer, North Country Growers LLC (controlled environment agriculture company) (2020 – present); Chief Executive Officer, Green Heat LLC (biofuels company) (2022 – present); President and Chief Executive Officer, Newbury Piret Company (investment banking firm) (1981 – 2019)	Director of New America High Income Fund, Inc. (closed-end investment company) (2004 – present); and Member, Board of Governors, Investment Company Institute (2000 – 2006)

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2397

Table of Contents

Independent Trustees (continued)

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Fred J. Ricciardi (76) Trustee	Trustee since 2014. Serves until a successor trustee is elected or earlier retirement or removal.	Private investor (2020 – present); Consultant (investment company services) (2012 – 2020); Executive Vice President, BNY Mellon (financial and investment company services) (1969 – 2012); Director, BNY International Financing Corp. (financial services) (2002 – 2012); Director, Mellon Overseas Investment Corp. (financial services) (2009 – 2012); Director, Financial Models (technology) (2005-2007); Director, BNY Hamilton Funds, Ireland (offshore investment companies) (2004-2007); Chairman/Director, AIB/BNY Securities Services, Ltd., Ireland (financial services) (1999-2006); Chairman, BNY Alternative Investment Services, Inc. (financial services) (2005-2007)	None

98Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Interested Trustees

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Lisa M. Jones (61)** Trustee, President and Chief Executive Officer	Trustee since 2017. Serves until a successor trustee is elected or earlier retirement or removal	Director, CEO and President of Amundi US, Inc. (investment management firm) (since September 2014); Director, CEO and President of Amundi Asset Management US, Inc. (since September 2014); Director, CEO and President of Amundi Distributor US, Inc. (since September 2014); Director, CEO and President of Amundi Asset Management US, Inc. (since September 2014); Chair, Amundi US, Inc., Amundi Distributor US, Inc. and Amundi Asset Management US, Inc. (September 2014 – 2018); Managing Director, Morgan Stanley Investment Management (investment management firm) (2010 – 2013); Director of Institutional Business, CEO of International, Eaton Vance Management (investment management firm) (2005 – 2010); Director of Amundi Holdings US, Inc. (since 2017)	Director of Clearwater Analytics (provider of web-based investment accounting software for reporting and reconciliation services) (September 2022 – present)
Kenneth J. Taubes (65)** Trustee	Trustee since 2014. Serves until a successor trustee is elected or earlier retirement or removal	Director and Executive Vice President (since 2008) and Chief Investment Officer, U.S. (since 2010) of Amundi US, Inc. (investment management firm); Director and Executive Vice President and Chief Investment Officer, U.S. of Amundi US (since 2008); Executive Vice President and Chief Investment Officer, U.S. of Amundi Asset Management US, Inc. (since 2009); Portfolio Manager of Amundi US (since 1999); Director of Amundi Holdings US, Inc. (since 2017)	None
** Ms. Jones and Mr. Taubes are Interested Trustees because they are officers or directors of the Fund’s investment adviser and certain of its affiliates.

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/2399

Table of Contents

Fund Officers

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Officer During At Least The Past Five Years
Christopher J. Kelley (58) Secretary and Chief Legal Officer	Since 2011. Serves at the discretion of the Board	Vice President and Associate General Counsel of Amundi US since January 2008; Secretary and Chief Legal Officer of all of the Pioneer Funds since June 2010; Assistant Secretary of all of the Pioneer Funds from September 2003 to May 2010; Vice President and Senior Counsel of Amundi US from July 2002 to December 2007	None
Thomas Reyes (60) Assistant Secretary	Since 2011. Serves at the discretion of the Board	Assistant General Counsel of Amundi US since May 2013 and Assistant Secretary of all the Pioneer Funds since June 2010; Counsel of Amundi US from June 2007 to May 2013	None
Heather L. Melito-Dezan (46) Assistant Secretary	Since 2022. Serves at the discretion of the Board	Director - Trustee and Board Relationships of Amundi US since September 2019; Assistant Secretary of Amundi US, Inc. since July 2020: Assistant Secretary of Amundi Asset Management US, Inc. since July 2020: Assistant Secretary of Amundi Distributor US, Inc. since July 2020; Assistant Secretary of all the Pioneer Funds since September 2022; Private practice from 2017 – 2019.	None
Anthony J. Koenig, Jr. (59) Treasurer and Chief Financial and Accounting Officer	Since 2021. Serves at the discretion of the Board	Managing Director, Chief Operations Officer and Fund Treasurer of Amundi US since May 2021; Treasurer of all of the Pioneer Funds since May 2021; Assistant Treasurer of all of the Pioneer Funds from January 2021 to May 2021; and Chief of Staff, US Investment Management of Amundi US from May 2008 to January 2021	None
Luis I. Presutti (58) Assistant Treasurer	Since 2011. Serves at the discretion of the Board	Director – Fund Treasury of Amundi US since 1999; and Assistant Treasurer of all of the Pioneer Funds since 1999	None
Gary Sullivan (65) Assistant Treasurer	Since 2011. Serves at the discretion of the Board	Senior Manager – Fund Treasury of Amundi US since 2012; and Assistant Treasurer of all of the Pioneer Funds since 2002	None

100Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23

Table of Contents

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Officer During At Least The Past Five Years
Antonio Furtado (41) Assistant Treasurer	Since 2020. Serves at the discretion of the Board	Fund Oversight Manager – Fund Treasury of Amundi US since 2020; Assistant Treasurer of all of the Pioneer Funds since 2020; and Senior Fund Treasury Analyst from 2012 - 2020	None
Michael Melnick (52) Assistant Treasurer	Since 2021. Serves at the discretion of the Board	Vice President - Deputy Fund Treasurer of Amundi US since May 2021; Assistant Treasurer of all of the Pioneer Funds since July 2021; Director of Regulatory Reporting of Amundi US from 2001 – 2021; and Director of Tax of Amundi US from 2000 - 2001	None
John Malone (52) Chief Compliance Officer	Since 2018. Serves at the discretion of the Board	Managing Director, Chief Compliance Officer of Amundi US Asset Management; Amundi Asset Management US, Inc.; and the Pioneer Funds since September 2018; Chief Compliance Officer of Amundi Distributor US, Inc. since January 2014.	None
Brandon Austin (51) Anti-Money Laundering Officer	Since 2022. Serves at the discretion of the Board	Director, Financial Security – Amundi Asset Management; Anti-Money Laundering Officer of all the Pioneer Funds since March 2022 Director of Financial Security of Amundi US since July 2021; Vice President, Head of BSA, AML and OFAC, Deputy Compliance Manager, Crédit Agricole Indosuez Wealth Management (investment management firm) (2013 – 2021)	None

Pioneer Multi-Asset Income Fund | Annual Report | 7/31/23101

Table of Contents

How to Contact Amundi

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^SMfor automated fund yields, prices,
account information and transactions

1-800-225-4321

Retirement plans information

1-800-622-0176

Write to us:

Amundi
P.O. Box 534427
Pittsburgh, PA 15253-4427

Our toll-free fax	1-800-225-4240
Our internet e-mail address	us.askamundi@amundi.com (for general questions about Amundi only)

Visit our web site: www.amundi.com/us

This report must be preceded or accompanied by a prospectus.

Table of Contents

Amundi Asset Management US, Inc.
60 State Street
Boston, MA 02109

www.amundi.com/us

Securities offered through Amundi Distributor US, Inc.
60 State Street, Boston, MA 02109
Underwriter of Pioneer Mutual Funds, Member SIPC
© 2023 Amundi Asset Management US, Inc. 25962-11-0923

Pioneer Securitized Income Fund

Annual Report | July 31, 2023


A: SIFFX	Y: SYFFX

visit us: www.amundi.com/us

Table of Contents

President’s Letter	2
Portfolio Management Discussion	4
Portfolio Summary	10
Prices and Distributions	11
Performance Update	12
Comparing Ongoing Fund Expenses	15
Schedule of Investments	17
Financial Statements	24
Notes to Financial Statements	29
Report of Independent Registered Public Accounting Firm	43
Additional Information	45
Statement Regarding Liquidity Risk Management Program	46
Trustees, Officers and Service Providers	48

Pioneer Securitized Income Fund | Annual Report | 7/31/231

Table of Contents

President’s Letter

Dear Shareholders,

2Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

We greatly appreciate the trust you have placed in us and look forward to continuing to serve you in the future.

Lisa M. Jones
Head of the Americas, President and CEO of US
Amundi Asset Management US, Inc.
September 2023

Pioneer Securitized Income Fund | Annual Report | 7/31/233

Table of Contents

Portfolio Management Discussion | 7/31/23

In the following interview, portfolio managers Noah Funderburk and Nicolas Pauwels discuss the market environment and the factors that affected the performance of Pioneer Securitized Income Fund during the 12-month period ended July 31, 2023. Mr. Funderburk, a senior vice president, Director of Securitized Credit, and a portfolio manager at Amundi Asset Management US, Inc. (Amundi US), and Mr. Pauwels, a vice president, Deputy Director of Securitized Credit, and a portfolio manager at Amundi US, are responsible for the day-to-day management of the Fund.

Q	How did the Fund perform during the 12-month period ended July 31, 2023?
A	Pioneer Securitized Income Fund’s Class A shares returned 5.25% at net asset value during the 12-month period ended July 31, 2023, while the Fund’s benchmark, the Bloomberg US Securitized MBS/ABS/CMBS Index (the Bloomberg Index), returned -4.50%. During the same period, the average return of the 329 mutual funds in Morningstar’s Nontraditional Bond Fund Category was 2.56%.
Q	What factors drove the performance of securitized assets during the 12-month period ended July 31, 2023?
A	Higher-yielding securitized assets delivered positive absolute returns and outperformed the broad-based fixed-income market indices during the 12-month period. The performance of securitized assets received a boost from the contribution of the category’s above-average income generation, as well as a compression in yield spreads from the attractive levels that had existed at the beginning of the period. (Credit, or yield spreads, are commonly defined as the differences in yield between Treasuries and other types of fixed-income securities with similar maturities.) On the other hand, more interest-rate sensitive securitized assets backed by government guarantees, such as agency mortgage-backed securities (MBS), generally lagged.
	The MBS, asset-backed securities (ABS), and commercial MBS (CMBS) represented in the Fund’s benchmark, which tracks predominantly high-quality assets, returned -4.75%, 1.12% and -3.26%, respectively, for the 12-month period. MBS have typically been the key driver of the Blomberg Index’s return, given their large benchmark weighting of 92% (as of July 31, 2023). CMBS and ABS represented benchmark weights of 6% and 2%,

4Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

	respectively, as of period-end. The underperformance of CMBS during the period was largely a function of mounting investor concerns about both the office and retail sectors.
Q	What elements of the Fund’s positioning played the largest role in its benchmark-relative results during the 12-month period ended July 31, 2023?
A	The Fund’s positioning with respect to duration versus the Bloomberg Index was a key positive contributor to benchmark-relative outperformance. (Duration is a measure of the sensitivity of the price, or the value of principal, of a fixed-income investment to a change in interest rates, expressed as a number of years.) Coming into the 12-month period, the Fund’s duration had been significantly below that of the benchmark, which worked out well given the persistent increase in prevailing yields during the latter part of 2022. The portfolio’s positions in floating-rate securities, which have low durations since their coupons reset higher as interest rates rise, were particularly helpful to the Fund’s relative returns in that regard. As the 12-month period progressed, it became apparent, in our view, that the US Federal Reserve (Fed) was moving closer to the point at which it could stop raising interest rates. We therefore allowed the portfolio’s duration to rise from about 1.4 years at the start of the period to 2.8 years at the end of July 2023. Still, the Fund’s duration remained well below that of the Bloomberg Index. This is a typical approach for us in managing the Fund, given that the portfolio has tended to be less focused on agency MBS than the Bloomberg Index, and has a larger focus on the higher-yielding segments of the securitized market.
	From a sector standpoint, an allocation to non-agency MBS was the largest positive contributor to both the Fund’s absolute and benchmark-relative performance. The performance of non-agency MBS benefited during the period from their above-average yield, floating-rate coupons, and robust investor demand. Better-than-expected economic growth and strength in the housing market also benefited non-agency MBS during the period. On the other hand, the Fund’s holdings in agency MBS detracted from benchmark-relative returns for the 12-month period. Although the portfolio has had a large underweight to agency MBS compared to the benchmark, the Fund’s positions still lagged.

Pioneer Securitized Income Fund | Annual Report | 7/31/235

Table of Contents

	Since agency MBS are “AAA” rated government-backed securities, their performance has tended to derive primarily from interest-rate trends — a negative in the predominant environment over the past 12 months (bond prices and interest rates tend to move in opposite directions).
	Another detractor from the Fund’s benchmark-relative performance during the period was our effort to manage interest-rate risk in the portfolio through the use of US Treasury futures. The majority of the adverse effect from the use of the futures occurred in the second half of the 12-month period, when interest rates began to take a more uneven path following their steady increase throughout most of 2022. Despite the negative effect on the Fund’s return, that aspect of our investment strategy helped dampen overall portfolio volatility in a time of unusually large swings in the fixed-income market.
	The Fund’s positioning with respect to CMBS contributed positively to benchmark-relative performance during the 12-month period, but was a modest detractor in terms of absolute returns. We had identified risks in the office sector due to continued work-from-home trends, rising borrowing costs, and, later in the period, the challenges related to the weakening US regional banking sector. We therefore reduced the Fund’s exposure to the office sector, which helped mitigate the effects of the downturn. However, the Fund’s remaining positions in the sector detracted from benchmark-relative results.
	Positioning in ABS was an additional positive for the Fund’s relative returns. The portfolio’s ABS allocation benefited from holdings in the more esoteric, or non-traditional, segments of the category, as well as in securities backed by aircraft collateral. (Non-traditional ABS commonly include debt backed by franchise royalties, single-family rentals, data centers, and aircraft and railcar leases.) In general, we have maintained a preference for investing the Fund in ABS backed by auto loans, given the robust jobs market and the low overall level of consumer debt.
	Holdings in collateralized loan obligations (CLOs) were additional positive contributors to the Fund’s benchmark-relative performance for the 12-month period. CLOs fared well over the period, thanks to their floating-rate characteristics, above-

6Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

	average yield spreads, and solid relative value versus corporate bonds with similar ratings.
Q	Did the Fund have any exposure to derivative investments during the 12-month period ended July 31, 2023? If so, did the use of derivatives have an effect on performance?
A	Yes. As noted above, our use of US Treasury futures in an effort to manage the portfolio’s interest-rate risk detracted from the Fund’s performance for the 12-month period.
Q	How would you characterize the Fund’s distributions* to shareholders during the 12-month period ended July 31, 2023?
A	The Fund’s monthly distribution rate fluctuated in response to volatility in prevailing yields over the 12-month period, but finished the period higher on July 31, 2023 than it had been 12 months earlier.
Q	What is your current view on the securitized market heading into the Fund’s new fiscal year?
A	We have positioned the portfolio for a possible slowdown in economic growth, as well as for the growing likelihood, in our view, that the Fed will soon wrap up its long series of interest-rate increases. We have remained focused on investing the Fund in securities backed by collateral in the healthier segments of the economy, while seeking to avoid areas that are under stress. We think the US consumer, in particular, remains an area of relative strength for the securitized market. More broadly speaking, we believe securitized assets have continued to be a source of opportunity, given that yield spreads have remained attractive versus other segments of the fixed-income market.

*	Distributions are not guaranteed.

Pioneer Securitized Income Fund | Annual Report | 7/31/237

Table of Contents

Please refer to the Schedule of Investments on pages 17 - 23 for a full listing of Fund securities.

The Fund invests primarily in securitized asset instruments, including mortgage-backed securities, asset-backed securities and other securities.

A substantial portion of the Fund’s assets ordinarily will consist of high yield debt securities that involve substantial risk of loss.

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.

Investments in high yield or lower-rated securities are subject to greater-than-average price volatility, illiquidity and possibility of default. The market price of securities may fluctuate when interest rates change. 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.

The value of mortgage-related and asset backed securities will be influenced by factors affecting the real estate market and the assets underlying those securities. These securities are also subject to prepayment and extension risks and risk of default.

The Fund may employ leverage, which increases the volatility of investment returns and subjects the Fund to magnified losses if an underlying investment

8Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

declines in value. Certain securities and derivatives held by the Fund may be impossible or difficult to purchase, sell or unwind. Such securities may also be difficult to value.

The use of interest rate futures and options and other derivatives can increase fund losses and reduce opportunities for gain. The Fund may invest in credit default swaps, inverse floating rate obligations, and other derivative instruments. Derivatives may have a leveraging effect on the Fund.

The Fund is non-diversified, which means that it can invest a large percentage of its assets in the securities of any one or more issuers. Being non-diversified may magnify the Fund’s losses from adverse events affecting a particular issuer.

Please see a prospectus for a complete discussion of the Fund’s risks.

Pioneer Securitized Income Fund | Annual Report | 7/31/239

Table of Contents

Portfolio Summary | 7/31/23

Sector Distribution

(As a percentage of total investments)*

10 Largest Holdings

(As a percentage of total investments)*
1.	Freddie Mac STACR Trust, Series 2018-HQA2, Class B2, 16.183% (SOFR30A + 1,111 bps), 10/25/48 (144A)	2.81%
2.	Santander Bank Auto Credit-Linked Notes, Series 2022-A, Class E, 12.662%, 5/15/32 (144A)	2.68
3.	Santander Bank N.A. - SBCLN, Series 2021-1A, Class E, 6.171%, 12/15/31 (144A)	2.64
4.	STACR Trust, Series 2018-HRP2, Class B2, 15.683% (SOFR30A + 1,061 bps), 2/25/47 (144A)	2.60
5.	Continental Credit Card ABS LLC, Series 2019-1A, Class C, 6.16%, 8/15/26 (144A)	2.58
6.	Cascade Funding Mortgage Trust, Series 2018-RM2, Class D, 4.00%, 10/25/68 (144A)	2.52
7.	JPMorgan Chase Bank N.A. - CACLN, Series 2021-2, Class F, 4.393%, 12/26/28 (144A)	2.50
8.	STACR Trust, Series 2018-HRP2, Class B1, 9.383% (SOFR30A + 431 bps), 2/25/47 (144A)	2.40
9.	Arivo Acceptance Auto Loan Receivables Trust, Series 2021-1A, Class D, 5.83%, 1/18/28 (144A)	2.31
10.	Freddie Mac STACR Trust, Series 2019-FTR2, Class B1, 8.183% (SOFR30A + 311 bps), 11/25/48 (144A)	2.20


*	Excludes short-term investments and all derivative contracts except for options purchased. The Fund is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any securities.

10Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Prices and Distributions | 7/31/23

Net Asset Value per Share

Class	7/31/23	7/31/22
A	$9.12	$9.43
Y	$9.12	$9.44

Distributions per Share: 8/1/22 - 7/31/23

Class	Net Investment Income	Short-Term Capital Gains	Long-Term Capital Gains
A	$0.6335	$—	$0.1477
Y	$0.6561	$—	$0.1477

Index Definitions

Bloomberg US Securitized MBS/ABS/CMBS Index tracks agency mortgage backed pass-through securities (both fixed-rate and hybrid ARM) guaranteed by Ginnie Mae (GNMA), Fannie Mae (FNMA), and Freddie Mac (FHLMC); investment-grade debt asset-backed securities; and investment-grade commercial mortgage backed securities. The index is constructed by grouping individual pools into aggregates or generics based on program, coupon, and vintage. Indices are unmanaged and their returns assume reinvestment of dividends and do not reflect any fees or expenses. It is not possible to invest directly in an index.

The indices defined here pertains to the “Value of $10,000 Investment” and “Value of $1 Million Investment” charts on pages 12 – 14.

Pioneer Securitized Income Fund | Annual Report | 7/31/2311

Table of Contents

Performance Update | 7/31/23

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 Securitized Income Fund at public offering price during the periods shown, compared to that of the Bloomberg US Securitized MBS/ABS/CMBS Index.*

Average Annual Total Returns (As of July 31, 2023)
Period	Net Asset Value (NAV)	Public Offering Price (POP)	Bloomberg US Securitized MBS/ABS /CMBS Index
Life of Class (7/2/21)	2.17%	-0.08%	-5.17%
1 Year	5.36	0.67	-4.50

Expense Ratio (Per prospectus dated December 1, 2022)
Gross	Net
1.97%	0.90%

Value of $10,000 Investment

*Performance of Class A shares shown in the graph above is from the inception of Class A shares on 7/2/21 through 7/31/23. Index information shown in the graph above is from 7/31/21 through 7/31/23.

Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performancemay be lower or higher than the performance data quoted.

The net expense ratio reflects the contractual expense limitation currently in effect through December 1, 2023. There can be no assurance that Amundi US 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.

Please refer to the financial highlights for more current expense ratios.

12Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Performance Update | 7/31/23

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 Securitized Income Fund during the periods shown, compared to that of the Bloomberg US Securitized MBS/ABS/CMBS Index.*

Average Annual Total Returns (As of July 31, 2023)
Period	Net Asset Value (NAV)	Bloomberg US Securitized MBS/ABS /CMBS Index
Life of Class (12/10/19)	4.38%	-1.99%
1 Year	5.51	-4.50

Expense Ratio (Per prospectus dated December 1, 2022)
Gross	Net
1.76%	0.65%

Value of $5 Million Investment

*Performance of Class Y shares shown in the graph above is from the inception of Class Y shares on 12/10/19 through 7/31/23. Index information shown in the graph above is from 12/31/19 through 7/31/23.

Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performancemay be lower or higher than the performance data quoted.

The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions.

The Fund acquired the assets and liabilities of Pioneer Securitized Income Fund (the “Predecessor Fund”) on June 30, 2021 (the “Reorganization”). As a result of the

Pioneer Securitized Income Fund | Annual Report | 7/31/2313

Table of Contents

Performance Update | 7/31/23

Class Y Shares

Reorganization, the Predecessor Fund’s performance and financial history became the performance and financial history of the Fund. The performance of Class Y shares of the Fund is the performance of the common shares of the Predecessor Fund for periods prior to the Reorganization, and has not been restated to reflect any differences in expenses.

Please refer to the financial highlights for more current expense ratios.

14Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

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.

Using the Tables

Actual Expenses

(1)	Divide your account value by $1,000 Example: an $8,600 account value ÷ $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 Securitized Income Fund

Based on actual returns from February 1, 2023 through July 31, 2023.

Share Class	A	Y
Beginning Account Value on 2/1/23	$1,000.00	$1,000.00
Ending Account Value (after expenses) on 7/31/23	$1,038.70	$1,040.00
Expenses Paid During Period*	$4.55	$3.29


*	Expenses are equal to the Fund’s annualized expense ratio of 0.90% and 0.65% for Class A and Y shares, respectively, multiplied by the average account value over the period, multiplied by 181/365 (to reﬂect the partial year period).

Pioneer Securitized Income Fund | Annual Report | 7/31/2315

Table of Contents

Comparing Ongoing Fund Expenses (continued)

Hypothetical Example for Comparison Purposes

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

Based on a hypothetical 5% return per year before expenses, reflecting the period from February 1, 2023 through July 31, 2023.

Share Class	A	Y
Beginning Account Value on 2/1/23	$1,000.00	$1,000.00
Ending Account Value (after expenses) on 7/31/23	$1,020.33	$1,021.57
Expenses Paid During Period*	$4.51	$3.26


*	Expenses are equal to the Fund’s annualized expense ratio of 0.90% and 0.65% for Class A and Y shares, respectively, multiplied by the average account value over the period, multiplied by 181/365 (to reﬂect the partial year period).

16Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Schedule of Investments | 7/31/23

Principal Amount USD ($)		Value
	UNAFFILIATED ISSUERS — 94.2%
	Asset Backed Securities — 47.8% of Net Assets
120,000	AMSR Trust, Series 2022-SFR3, Class E2, 4.00%, 10/17/39 (144A)	$ 103,193
550,000	Arivo Acceptance Auto Loan Receivables Trust, Series 2021-1A, Class D, 5.83%, 1/18/28 (144A)	514,577
400,000	Arivo Acceptance Auto Loan Receivables Trust, Series 2022-1A, Class D, 7.38%, 9/17/29 (144A)	369,488
200,000	Arivo Acceptance Auto Loan Receivables Trust, Series 2022-2A, Class C, 9.84%, 3/15/29 (144A)	205,521
350,000	Avid Automobile Receivables Trust, Series 2021-1, Class F, 5.16%, 10/16/28 (144A)	316,499
235,000	BHG Securitization Trust, Series 2023-A, Class B, 6.35%, 4/17/36 (144A)	231,397
260,191	Blackbird Capital Aircraft, Series 2021-1A, Class B, 3.446%, 7/15/46 (144A)	215,076
250,000(a)	Clover CLO LLC, Series 2020-1A, Class ER, 11.87% (3 Month Term SOFR + 656 bps), 4/15/34 (144A)	236,364
220,896	Conn's Receivables Funding LLC, Series 2021-A, Class C, 4.59%, 5/15/26 (144A)	219,196
600,000	Continental Credit Card ABS LLC, Series 2019-1A, Class C, 6.16%, 8/15/26 (144A)	576,018
200,000	Continental Finance Credit Card ABS Master Trust, Series 2022-A, Class C, 9.33%, 10/15/30 (144A)	189,401
400,000	Crossroads Asset Trust, Series 2021-A, Class E, 5.48%, 1/20/28 (144A)	383,537
62,500	Diamond Resorts Owner Trust, Series 2019-1A, Class D, 5.25%, 2/20/32 (144A)	58,850
200,000	Exeter Automobile Receivables Trust, Series 2022-5A, Class D, 7.40%, 2/15/29	202,493
500,000	First Investors Auto Owner Trust, Series 2021-1A, Class F, 5.37%, 4/17/28 (144A)	458,706
175,000	GLS Auto Receivables Issuer Trust, Series 2023-1A, Class D, 7.01%, 1/16/29 (144A)	176,260
400,000(a)	GRACIE POINT INTERNATIONAL FUNDING, Series 2022-1A, Class E, 10.815% (SOFR30A + 575 bps), 4/1/24 (144A)	398,903
200,000	HOA Funding LLC - HOA, Series 2021-1A, Class B, 7.432%, 8/20/51 (144A)	154,462
300,000(a)	ICG US CLO, Ltd., Series 2016-1A, Class DRR, 13.071% (3 Month Term SOFR + 770 bps), 4/29/34 (144A)	227,619
600,000	JPMorgan Chase Bank N.A. - CACLN, Series 2021-2, Class F, 4.393%, 12/26/28 (144A)	556,876
148,937	Libra Solutions LLC, Series 2022-2A, Class B, 8.85%, 10/15/34 (144A)	147,634

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

Pioneer Securitized Income Fund | Annual Report | 7/31/2317

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Asset Backed Securities — (continued)
250,000(a)	Madison Park Funding XLV, Ltd., Series 2020-45A, Class ER, 11.92% (3 Month Term SOFR + 661 bps), 7/15/34 (144A)	$ 226,841
210,000	NMEF Funding LLC, Series 2022-B, Class C, 8.54%, 6/15/29 (144A)	209,323
250,000(a)	Ocean Trails CLO IX, Series 2020-9A, Class ER, 13.02% (3 Month Term SOFR + 771 bps), 10/15/34 (144A)	219,901
270,000	Octane Receivables Trust, Series 2022-2A, Class D, 7.70%, 2/20/30 (144A)	269,460
135,000	Octane Receivables Trust, Series 2023-1A, Class D, 7.76%, 3/20/30 (144A)	134,840
302,110	Oportun Funding XIV LLC, Series 2021-A, Class C, 3.44%, 3/8/28 (144A)	290,474
311,108	Pagaya AI Debt Trust, Series 2023-1, Class A, 7.556%, 7/15/30 (144A)	311,470
94,827	Pagaya AI Debt Trust, Series 2023-3, Class A, 7.60%, 12/16/30 (144A)	94,995
400,000	Pawneee Equipment Receivables Series LLC, Series 2021-1, Class E, 5.21%, 5/15/28 (144A)	359,419
200,000	Progress Residential Trust, Series 2021-SFR8, Class G, 4.005%, 10/17/38 (144A)	170,156
100,000	Progress Residential Trust, Series 2021-SFR9, Class F, 4.053%, 11/17/40 (144A)	81,820
650,000	Santander Bank Auto Credit-Linked Notes, Series 2022-A, Class E, 12.662%, 5/15/32 (144A)	597,532
700,000	Santander Bank N.A. - SBCLN, Series 2021-1A, Class E, 6.171%, 12/15/31 (144A)	589,145
500,000	Tricolor Auto Securitization Trust, Series 2021-1A, Class F, 5.08%, 5/15/28 (144A)	475,155
500,000	Tricolor Auto Securitization Trust, Series 2022-1A, Class F, 9.80%, 7/16/29 (144A)	479,751
350,000	Tricon American Homes Trust, Series 2017-SFR2, Class F, 5.104%, 1/17/36 (144A)	345,376
330,000	Westlake Automobile Receivables Trust, Series 2023-1A, Class D, 6.79%, 11/15/28 (144A)	329,441
175,000	Westlake Automobile Receivables Trust, Series 2023-2A, Class D, 7.01%, 11/15/28 (144A)	174,831
	Total Asset Backed Securities (Cost $12,044,988)	$11,302,000


	Collateralized Mortgage Obligations—33.3% of Net Assets
206,000(a)	Bellemeade Re, Ltd., Series 2021-3A, Class B1, 8.919% (SOFR30A + 385 bps), 9/25/31 (144A)	$ 198,469
600,895(b)	Cascade Funding Mortgage Trust, Series 2018-RM2, Class D, 4.00%, 10/25/68 (144A)	560,590

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

18Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Collateralized Mortgage Obligations—(continued)
200,000(b)	CFMT LLC, Series 2023-HB12, Class M3, 4.25%, 4/25/33 (144A)	$ 158,416
140,000(a)	Connecticut Avenue Securities Trust, Series 2023-R06, Class 1M1, 6.769% (SOFR30A + 170 bps), 7/25/43 (144A)	140,350
290,000(a)	Eagle Re, Ltd., Series 2021-2, Class M2, 9.319% (SOFR30A + 425 bps), 4/25/34 (144A)	294,431
85,786(b)	FARM 21-1 Mortgage Trust, Series 2021-1, Class B, 3.237%, 7/25/51 (144A)	58,966
6,294,102(b)(c)	Flagstar Mortgage Trust, Series 2021-4, Class AX1, 0.206%, 6/1/51 (144A)	65,710
150,000(a)	Freddie Mac STACR REMIC Trust, Series 2020-DNA3, Class B2, 14.533% (SOFR30A + 946 bps), 6/25/50 (144A)	188,264
500,000(a)	Freddie Mac STACR Trust, Series 2018-HQA2, Class B2, 16.183% (SOFR30A + 1,111 bps), 10/25/48 (144A)	625,858
434,000(a)	Freddie Mac STACR Trust, Series 2019-DNA3, Class B2, 13.333% (SOFR30A + 826 bps), 7/25/49 (144A)	478,864
500,000(a)	Freddie Mac STACR Trust, Series 2019-FTR2, Class B1, 8.183% (SOFR30A + 311 bps), 11/25/48 (144A)	490,006
400,000(a)	Freddie Mac STACR Trust, Series 2019-FTR3, Class B2, 9.95% (SOFR30A + 491 bps), 9/25/47 (144A)	388,095
330,000(a)	Freddie Mac Structured Agency Credit Risk Debt Notes, Series 2023-HQA2, Class M1B, 8.419% (SOFR30A + 335 bps), 6/25/43 (144A)	337,857
110,000(b)	GCAT Trust, Series 2021-CM1, Class M1, 2.276%, 4/25/65 (144A)	86,046
200,000(b)	GS Mortgage-Backed Securities Trust, Series 2020-NQM1, Class B1, 5.143%, 9/27/60 (144A)	161,902
300,000(a)	Home Re, Ltd., Series 2020-1, Class B1, 12.412% (1 Month USD LIBOR + 700 bps), 10/25/30 (144A)	306,814
500,000(a)	Home Re, Ltd., Series 2021-2, Class B1, 9.219% (SOFR30A + 415 bps), 1/25/34 (144A)	480,845
175,000(a)	Home Re, Ltd., Series 2022-1, Class B1, 14.069% (SOFR30A + 900 bps), 10/25/34 (144A)	185,786
4,150,598(b)(c)	Hundred Acre Wood Trust, Series 2021-INV1, Class AX1, 0.225%, 7/25/51 (144A)	44,612
205,000(b)	Imperial Fund Mortgage Trust, Series 2021-NQM2, Class B2, 4.302%, 9/25/56 (144A)	128,610
8,117,864(b)(c)	JP Morgan Mortgage Trust, Series 2021-10, Class AX1, 0.122%, 12/25/51 (144A)	48,949
6,981,308(b)(c)	JP Morgan Mortgage Trust, Series 2021-8, Class AX1, 0.122%, 12/25/51 (144A)	39,535

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

Pioneer Securitized Income Fund | Annual Report | 7/31/2319

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Collateralized Mortgage Obligations—(continued)
150,000(a)	Oaktown Re VII, Ltd., Series 2021-2, Class B1, 9.469% (SOFR30A + 440 bps), 4/25/34 (144A)	$ 150,470
260,000(a)(d)	Radnor Re, Ltd., Series 2023-1, Class M1A, 7.767% (SOFR30A + 270 bps), 7/25/33 (144A)	260,000
150,000(a)(d)	Radnor Re, Ltd., Series 2023-1, Class M1B, 9.417% (SOFR30A + 435 bps), 7/25/33 (144A)	150,000
450,000(b)	RMF Buyout Issuance Trust, Series 2022-HB1, Class M5, 4.50%, 4/25/32 (144A)	50,063
218,709(b)	Seasoned Credit Risk Transfer Trust, Series 2018-1, Class M, 4.75%, 5/25/57	200,735
150,000(b)	Seasoned Credit Risk Transfer Trust, Series 2019-3, Class M, 4.75%, 10/25/58	134,766
500,000(a)	STACR Trust, Series 2018-HRP2, Class B1, 9.383% (SOFR30A + 431 bps), 2/25/47 (144A)	533,883
500,000(a)	STACR Trust, Series 2018-HRP2, Class B2, 15.683% (SOFR30A + 1,061 bps), 2/25/47 (144A)	578,580
150,000(a)	Triangle Re, Ltd., Series 2021-3, Class B1, 10.019% (SOFR30A + 495 bps), 2/25/34 (144A)	145,254
200,000(a)	Triangle Re, Ltd., Series 2021-3, Class M2, 8.819% (SOFR30A + 375 bps), 2/25/34 (144A)	198,767
	Total Collateralized Mortgage Obligations (Cost $8,284,139)	$7,871,493


	Commercial Mortgage-Backed Securities—12.6% of Net Assets
500,000(b)	COMM Mortgage Trust, Series 2020-CBM, Class F, 3.633%, 2/10/37 (144A)	$ 441,800
250,000(a)	Freddie Mac Multifamily Structured Credit Risk, Series 2021-MN1, Class B1, 12.819% (SOFR30A + 775 bps), 1/25/51 (144A)	239,122
250,000(a)	Freddie Mac Multifamily Structured Credit Risk, Series 2021-MN3, Class B1, 11.919% (SOFR30A + 685 bps), 11/25/51 (144A)	226,875
250,000(a)	Freddie Mac Multifamily Structured Credit Risk, Series 2021-MN3, Class M2, 9.069% (SOFR30A + 400 bps), 11/25/51 (144A)	234,647
250,000(a)	MF1 Multifamily Housing Mortgage Loan Trust, Series 2021-FL5, Class D, 7.836% (1 Month Term SOFR + 261 bps), 7/15/36 (144A)	237,330
500,000(a)	Multifamily Connecticut Avenue Securities Trust, Series 2020-01, Class M10, 8.933% (SOFR30A + 386 bps), 3/25/50 (144A)	480,810
500,000(b)	Natixis Commercial Mortgage Securities Trust, Series 2019-FAME, Class E, 4.398%, 8/15/36 (144A)	261,545

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

20Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Commercial Mortgage-Backed Securities—(continued)
500,000(a)	Natixis Commercial Mortgage Securities Trust, Series 2019-MILE, Class E, 8.801% (1 Month Term SOFR + 358 bps), 7/15/36 (144A)	$ 360,071
260,000(a)	Ready Capital Mortgage Financing LLC, Series 2021-FL6, Class AS, 6.612% (1 Month Term SOFR + 131 bps), 7/25/36 (144A)	250,426
343,384(b)	Velocity Commercial Capital Loan Trust, Series 2020-1, Class M5, 4.29%, 2/25/50 (144A)	256,861
	Total Commercial Mortgage-Backed Securities (Cost $3,389,342)	$2,989,487


	Corporate Bonds — 0.5% of Net Assets
	Airlines — 0.5%
77,896	British Airways 2020-1 Class B Pass Through Trust, 8.375%, 11/15/28 (144A)	$ 78,535
50,427	United Airlines 2020-1 Class B Pass Through Trust, 4.875%, 1/15/26	48,672
	Total Airlines	$127,207


	Total Corporate Bonds (Cost $128,323)	$127,207


	TOTAL INVESTMENTS IN UNAFFILIATED ISSUERS — 94.2% (Cost $23,846,792)	$22,290,187
	OTHER ASSETS AND LIABILITIES — 5.8%	$ 1,370,797
	net assets — 100.0%	$23,660,984

bps	Basis Points.
LIBOR	London Interbank Offered Rate.
SOFR	Secured Overnight Financing Rate.
SOFR30A	Secured Overnight Financing Rate 30 Day Average.
(144A)	The resale of such security is exempt from registration under Rule 144A of the Securities Act of 1933. Such securities may be resold normally to qualified institutional buyers. At July 31, 2023, the value of these securities amounted to $21,703,521, or 91.7% of net assets.

(a)	Floating rate note. Coupon rate, reference index and spread shown at July 31, 2023.
(b)	The interest rate is subject to change periodically. The interest rate and/or reference index and spread shown at July 31, 2023.
(c)	Security represents the interest-only portion payments on a pool of underlying mortgages or mortgage-backed securities.

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

Pioneer Securitized Income Fund | Annual Report | 7/31/2321

Table of Contents

Schedule of Investments | 7/31/23 (continued)

(d)	Securities purchased on a when-issued basis. Rates do not take effect until settlement date.

FUTURES CONTRACTS
FIXED INCOME INDEX FUTURES CONTRACTS

Number of Contracts Long	Description	Expiration Date	Notional Amount	Market Value	Unrealized (Depreciation)
20	U.S. 5 Year Note (CBT)	9/29/23	$2,181,648	$2,136,406	$ (45,242)
45	U.S. 10 Year Note (CBT)	9/20/23	5,138,353	5,013,281	(125,072)
			$7,320,001	$7,149,687	$ (170,314)
TOTAL FUTURES CONTRACTS			$ 7,320,001	$7,149,687	$(170,314)

Purchases and sales of securities (excluding short-term investments) for the year ended July 31, 2023, aggregated $9,008,485 and $11,503,838, respectively.

At July 31, 2023, the net unrealized depreciation on investments based on cost for federal tax purposes of $23,676,478 was as follows:

Aggregate gross unrealized appreciation for all investments in which there is an excess of value over tax cost	$ 386,173
Aggregate gross unrealized depreciation for all investments in which there is an excess of tax cost over value	(1,942,778)
Net unrealized depreciation	$(1,556,605)

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

22Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels below.

Level 1	–	unadjusted 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 risks, etc.). See Notes to Financial Statements — Note 1A.
Level 3	–	significant unobservable inputs (including the Adviser's own assumptions in determining fair value of investments). See Notes to Financial Statements — Note 1A.

The following is a summary of the inputs used as of July 31, 2023, in valuing the Fund's investments:

	Level 1	Level 2	Level 3	Total
Asset Backed Securities	$ —	$11,302,000	$—	$11,302,000
Collateralized Mortgage Obligations	—	7,871,493	—	7,871,493
Commercial Mortgage-Backed Securities	—	2,989,487	—	2,989,487
Corporate Bonds	—	127,207	—	127,207
Total Investments in Securities	$ —	$ 22,290,187	$ —	$ 22,290,187
Other Financial Instruments
Net unrealized depreciation on futures contracts	$(170,314)	$ —	$—	$ (170,314)
Total Other Financial Instruments	$ (170,314)	$ —	$ —	$ (170,314)

During the year ended July 31, 2023, there were no transfers in or out of Level 3.

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

Pioneer Securitized Income Fund | Annual Report | 7/31/2323

Table of Contents

Statement of Assets and Liabilities | 7/31/23

ASSETS:
Investments in unaffiliated issuers, at value (cost $23,846,792)	$22,290,187
Cash	1,671,282
Futures collateral	166,535
Variation margin for futures contracts	4,063
Receivables —
Fund shares sold	13,473
Interest	86,649
Due from the Adviser	3,280
Other assets	19,365
Total assets	$24,254,834
LIABILITIES:
Payables —
Investment securities purchased	$ 414,063
Fund shares repurchased	5,753
Distributions	41,054
Trustees' fees	570
Professional fees	108,531
Management fees	1,773
Distribution fees	72
Accrued expenses	22,034
Total liabilities	$ 593,850
NET ASSETS:
Paid-in capital	$25,863,889
Distributable earnings (loss)	(2,202,905)
Net assets	$ 23,660,984
NET ASSET VALUE PER SHARE:
No par value (unlimited number of shares authorized)
Class A (based on $2,127,437/233,369 shares)	$ 9.12
Class Y (based on $21,533,547/2,360,960 shares)	$ 9.12
MAXIMUM OFFERING PRICE PER SHARE:
Class A (based on $9.12 net asset value per share/100%-4.50% maximum sales charge)	$ 9.55

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

24Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Statement of Operations FOR THE YEAR ENDED 7/31/23

INVESTMENT INCOME:
Interest from unaffiliated issuers	$2,025,977
Dividends from unaffiliated issuers	47,256
Total Investment Income		$ 2,073,233
EXPENSES:
Management fees	$ 141,805
Administrative expenses	16,676
Transfer agent fees
Class A	61
Class Y	4,905
Distribution fees
Class A	5,113
Shareowner communications expense	2,316
Custodian fees	443
Registration fees	49,264
Professional fees	168,145
Printing expense	26,478
Officers' and Trustees' fees	8,073
Insurance expense	293
Miscellaneous	5,003
Total expenses		$ 428,575
Less fees waived and expenses reimbursed by the Adviser		(255,824)
Net expenses		$ 172,751
Net investment income		$ 1,900,482
REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS:
Net realized gain (loss) on:
Investments in unaffiliated issuers	$ (389,751)
Futures contracts	(132,207)	$ (521,958)
Change in net unrealized appreciation (depreciation) on:
Investments in unaffiliated issuers	$ 159,178
Futures contracts	(170,314)	$ (11,136)
Net realized and unrealized gain (loss) on investments		$ (533,094)
Net increase in net assets resulting from operations		$1,367,388

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

Pioneer Securitized Income Fund | Annual Report | 7/31/2325

Table of Contents

Statement of Changes in Net Assets

	Year Ended 7/31/23	Year Ended 7/31/22
FROM OPERATIONS:
Net investment income (loss)	$ 1,900,482	$ 1,191,702
Net realized gain (loss) on investments	(521,958)	530,591
Change in net unrealized appreciation (depreciation) on investments	(11,136)	(1,976,260)
Net increase (decrease) in net assets resulting from operations	$ 1,367,388	$ (253,967)
DISTRIBUTIONS TO SHAREOWNERS:
Class A ($0.78 and $0.58 per share, respectively)	$ (174,407)	$ (120,348)
Class Y ($0.81 and $0.61 per share, respectively)	(2,103,313)	(1,382,353)
Total distributions to shareowners	$ (2,277,720)	$ (1,502,701)
FROM FUND SHARE TRANSACTIONS:
Net proceeds from sales of shares	$ 3,189,419	$ 6,590,992
Reinvestment of distributions	1,844,746	1,399,934
Cost of shares repurchased	(6,921,356)	(1,763,070)
Net increase (decrease) in net assets resulting from Fund share transactions	$ (1,887,191)	$ 6,227,856
Net increase (decrease) in net assets	$ (2,797,523)	$ 4,471,188
NET ASSETS:
Beginning of year	$26,458,507	$21,987,319
End of year	$ 23,660,984	$26,458,507

	Year Ended 7/31/23 Shares	Year Ended 7/31/23 Amount	Year Ended 7/31/22 Shares	Year Ended 7/31/22 Amount
Class A
Shares sold	2,560	$ 23,158	2,303	$ 22,392
Reinvestment of distributions	17,642	160,249	12,248	120,139
Less shares repurchased	(2,128)	(19,031)	—	—
Net increase	18,074	$ 164,376	14,551	$ 142,531
Class Y
Shares sold	347,347	$ 3,166,261	669,318	$ 6,568,600
Reinvestment of distributions	185,375	1,684,497	130,490	1,279,795
Less shares repurchased	(760,712)	(6,902,325)	(184,428)	(1,763,070)
Net increase (decrease)	(227,990)	$(2,051,567)	615,380	$ 6,085,325

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

26Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Financial Highlights

	Year Ended 7/31/23	Year Ended 7/31/22	7/2/21 to 7/31/21*
Class A
Net asset value, beginning of period	$ 9.43	$10.11	$10.12
Increase (decrease) from investment operations:
Net investment income (loss) (a)	$ 0.66	$ 0.45	$ 0.04
Net realized and unrealized gain (loss) on investments	(0.19)	(0.55)	(0.01)
Net increase (decrease) from investment operations	$ 0.47	$ (0.10)	$ 0.03
Distributions to shareowners:
Net investment income	$ (0.63)	$ (0.45)	$ (0.04)
Net realized gain	(0.15)	(0.13)	—
Total distributions	$ (0.78)	$ (0.58)	$ (0.04)
Net increase (decrease) in net asset value	$ (0.31)	$ (0.68)	$ (0.01)
Net asset value, end of period	$ 9.12	$ 9.43	$10.11
Total return (b)	5.36%	(1.03)%	0.27%(c)
Ratio of net expenses to average net assets	0.90%	0.88%	0.90%(d)
Ratio of net investment income (loss) to average net assets	7.19%	4.58%	4.56%(d)
Portfolio turnover rate	38%	36%	59%(c)
Net assets, end of period (in thousands)	$2,127	$2,031	$2,029
Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly:
Total expenses to average net assets	1.87%	1.97%	5.42%(d)
Net investment income (loss) to average net assets	6.22%	3.49%	0.04%(d)

*	Class A commenced operations on July 2, 2021.
(a)	The per-share data presented above is based on the average shares outstanding for the period presented.
(b)	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.
(c)	Not annualized.
(d)	Annualized.

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

Pioneer Securitized Income Fund | Annual Report | 7/31/2327

Table of Contents

Financial Highlights (continued)

	Year Ended 7/31/23	Year Ended 7/31/22	Year Ended 7/31/21	12/10/19 to 7/31/20*
Class Y
Net asset value, beginning of period	$ 9.44	$ 10.11	$ 8.67	$ 10.00
Increase (decrease) from investment operations:
Net investment income (loss) (a)	$ 0.67	$ 0.48	$ 0.45	$ 0.28
Net realized and unrealized gain (loss) on investments	(0.18)	(0.54)	1.60	(1.33)
Net increase (decrease) from investment operations	$ 0.49	$ (0.06)	$ 2.05	$ (1.05)
Distributions to shareowners:
Net investment income	$ (0.66)	$ (0.48)	$ (0.45)	$ (0.28)
Net realized gain	(0.15)	(0.13)	(0.16)	—
Total distributions	$ (0.81)	$ (0.61)	$ (0.61)	$ (0.28)
Net increase (decrease) in net asset value	$ (0.32)	$ (0.67)	$ 1.44	$ (1.33)
Net asset value, end of period	$ 9.12	$ 9.44	$ 10.11	$ 8.67
Total return (b)	5.51%	(0.68)%	24.32%	(10.30)%(c)
Ratio of net expenses to average net assets	0.65%	0.65%	0.96%	0.99%(d)
Ratio of net investment income (loss) to average net assets	7.39%	4.88%	4.69%	5.06%(d)
Portfolio turnover rate	38%	36%	59%	82%(c)
Net assets, end of period (in thousands)	$21,534	$24,428	$19,958	$17,656
Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly:
Total expenses to average net assets	1.64%	1.76%	2.50%	2.62%(d)
Net investment income (loss) to average net assets	6.40%	3.77%	3.15%	3.43%(d)

*	Class Y commenced operations on December 10, 2019.
(a)	The per-share data presented above is based on the average shares outstanding for the period presented.
(b)	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.
(c)	Not annualized.
(d)	Annualized.

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

28Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Notes to Financial Statements | 7/31/23

1. Organization and Signiﬁcant Accounting Policies

Pioneer Securitized Income Fund (the “Fund”) is one of four portfolios comprising Pioneer Series Trust IV (the "Trust"), a Delaware statutory trust. The Fund is registered under the Investment Company Act of 1940, as amended (the “1940 Act”) as a non-diversified, open-end management investment company. The Fund, which commenced operations on June 30, 2021, is the successor to Pioneer Securitized Income Fund, a closed-end interval fund (the “Predecessor Fund”). The Predecessor Fund transferred all of the net assets of common shares of the Predecessor Fund in exchange for Class Y shares of the Fund on June 30, 2021, in a one-to-one exchange ratio, pursuant to an agreement and plan of reorganization (the “Reorganization”) approved by the Board of Trustees of the Fund and the Predecessor Fund and by the majority shareholder of the Predecessor Fund. Accordingly, the Reorganization, which was a tax-free event to shareholders, had no effect on the Fund’s operations. As a result of the Reorganization, the Fund is the accounting successor of the Predecessor Fund, and as such, the financial statements, and financial highlights for Class Y shares, reflect the financial information of the Predecessor Fund through June 30, 2021. The investment objective of the Fund is total return.

The Fund offers four classes of shares designated as Class A, Class C, Class K and Class Y shares. As noted above, all of the net assets of common shares of the Predecessor Fund, which commenced operations on December 10, 2019, were transferred in exchange for Class Y shares of the Fund on June 30, 2021. Class A shares commenced operations on July 2, 2021. Class C and Class K shares had not commenced operations as of July 31, 2023. 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 Trust gives the Board of Trustees the flexibility to specify either per-share voting or dollar-weighted voting when submitting matters for shareowner approval. Under per-share voting, each share of a class of the Fund is entitled to one vote. Under dollar-weighted voting, a shareowner’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

Pioneer Securitized Income Fund | Annual Report | 7/31/2329

Table of Contents

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 or Class Y shares.

In March 2020, FASB issued an Accounting Standard Update, ASU 2020-04, Reference Rate Reform (Topic 848) — Facilitation of the Effects of Reference Rate Reform on Financial Reporting (“ASU 2020-04”), which provides optional, temporary relief with respect to the financial reporting of contracts subject to certain types of modifications due to the planned discontinuation of the London Interbank Offered Rate (“LIBOR”) and other LIBOR-based reference rates at the end of 2021. The temporary relief provided by ASU 2020-04 is effective for certain reference rate-related contract modifications that occur during the period from March 12, 2020 through December 31, 2023. Management is evaluating the impact of ASU 2020-04 on the Fund's investments, derivatives, debt and other contracts, if applicable, that will undergo reference rate-related modifications as a result of the reference rate reform.

The following is a summary of signiﬁcant accounting policies followed by the Fund in the preparation of its ﬁnancial statements:

30Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

A.	Security Valuation
	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.
	Fixed-income securities are valued by using 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, or may use a pricing matrix or other fair value methods or techniques to provide an estimated value of the security or instrument. A pricing matrix is a means of valuing a debt security on the basis of current market prices for other debt securities, historical trading patterns in the market for fixed-income securities and/or other factors. Non-U.S. debt securities that are listed on an exchange will be valued at the bid price obtained from an independent third party pricing service. When independent third party pricing services are unable to supply prices, or when prices or market quotations are considered to be unreliable, the value of that security may be determined using quotations from one or more broker-dealers.
	Futures contracts are generally valued at the closing settlement price established by the exchange on which they are traded.
	Shares of open-end registered investment companies (including money market mutual funds) are valued at such funds’ net asset value.
	Securities or loan interests for which independent pricing services or broker-dealers 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 the Adviser. The Adviser is designated as the valuation designee for the Fund pursuant to Rule 2a-5 under the 1940 Act. The Adviser’s fair valuation team is responsible for monitoring developments that may impact fair valued securities.
	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.

Pioneer Securitized Income Fund | Annual Report | 7/31/2331

Table of Contents

B.	Investment Income and Transactions
	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 and net of income accrued on defaulted securities.
	Interest and dividend income payable by delivery of additional shares is reclassified as PIK (payment-in-kind) income upon receipt and is included in interest and dividend income, respectively.
	Principal amounts of mortgage-backed securities 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 purchase prices of 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.
	Security transactions are recorded as of trade date. Gains and losses on sales of investments are calculated on the identified cost method for both financial reporting and federal income tax purposes.
C.	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 net taxable income and net realized capital gains, if any, to its shareowners. Therefore, no provision for federal income taxes is required. As of July 31, 2023, 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 on the Statement of Operations. Tax returns filed within the prior three years remain subject to examination by federal and state tax authorities.
	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. GAAP. Distributions in excess of net investment income or net realized gains are temporary over distributions 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.
	At July 31, 2023, the Fund was permitted to carry forward indefinitely $210,164 of short-term losses and $459,507 of long-term losses.

32Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

The tax character of distributions paid during the years ended July 31, 2023 and July 31, 2022, was as follows:

	2023	2022
Distributions paid from:	��
Ordinary income	$1,849,272	$1,419,855
Long-term capital gains	428,448	82,846
Total	$2,277,720	$1,502,701

The following shows the components of distributable earnings (losses) on a federal income tax basis at July 31, 2023:

	2023
Distributable earnings/(losses):
Undistributed ordinary income	$ 64,425
Capital loss carryforward	(669,671)
Other book/tax temporary differences	(41,054)
Net unrealized depreciation	(1,556,605)
Total	$(2,202,905)

The difference between book-basis and tax-basis net unrealized depreciation is attributable to the mark to market of futures contracts.

D.	Fund Shares
	The Fund records sales and repurchases of its shares as of trade date. The Distributor earned $0 in underwriting commissions on the sale of Class A shares during the year ended July 31, 2023.
E.	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 shares of the Fund (see Note 5). All expenses and fees paid to the Fund's transfer agent 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 4).
	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 and Class Y shares can reflect different transfer agent and distribution expense rates.

Pioneer Securitized Income Fund | Annual Report | 7/31/2333

Table of Contents

F.	Risks
	The value of securities held by the Fund may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic, political or regulatory conditions, recessions, the spread of infectious illness or other public health issues, inflation, changes in interest rates, armed conflict including Russia's military invasion of Ukraine, sanctions against Russia, other nations or individuals or companies and possible countermeasures, lack of liquidity in the bond markets or adverse investor sentiment. In the past several years, financial markets have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. These conditions may continue, recur, worsen or spread. Inflation and interest rates have increased and may rise further. These circumstances could adversely affect the value and liquidity of the Fund's investments and negatively impact the Fund's performance.
	The long-term impact of the COVID-19 pandemic and its subsequent variants on economies, markets, industries and individual issuers, are not known. Some sectors of the economy and individual issuers have experienced or may experience particularly large losses. Periods of extreme volatility in the financial markets, reduced liquidity of many instruments, increased government debt, inflation, and disruptions to supply chains, consumer demand and employee availability, may continue for some time. Following Russia's invasion of Ukraine, Russian securities lost all, or nearly all, their market value. Other securities or markets could be similarly affected by past or future political, geopolitical or other events or conditions.
	Governments and central banks, including the U.S. Federal Reserve, have taken extraordinary and unprecedented actions to support local and global economies and the financial markets. These actions have resulted in significant expansion of public debt, including in the U.S. The consequences of high public debt, including its future impact on the economy and securities markets, may not be known for some time.
	The U.S. and other countries are periodically involved in disputes over trade and other matters, which may result in tariffs, investment restrictions and adverse impacts on affected companies and securities. For example, the U.S. has imposed tariffs and other trade barriers on Chinese exports, has restricted sales of certain categories of goods to China, and has established barriers to investments in China. Trade disputes may adversely affect the economies of the U.S. and its trading partners, as well as companies directly or indirectly affected and financial markets generally. If the political climate between the U.S. and

34Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

	China does not improve or continues to deteriorate, if China were to attempt unification of Taiwan by force, or if other geopolitical conflicts develop or get worse, economies, markets and individual securities may be severely affected both regionally and globally, and the value of the Fund's assets may go down.
	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 market prices of the Fund's fixed income securities may fluctuate significantly when interest rates change. The value of your investment will generally go down when interest rates rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. For example, if interest rates increase by 1%, the value of a Fund's portfolio with a portfolio duration of ten years would be expected to decrease by 10%, all other things being equal. In recent years interest rates and credit spreads in the U.S. have been at historic lows. The U.S. Federal Reserve has raised certain interest rates, and interest rates may continue to go up. A general rise in interest rates could adversely affect the price and liquidity of fixed income securities. The maturity of a security may be significantly longer than its effective duration. A security's maturity and other features may be more relevant than its effective duration in determining the security's sensitivity to other factors affecting the issuer or markets generally, such as changes in credit quality or in the yield premium that the market may establish for certain types of securities (sometimes called "credit spread"). In general, the longer its maturity the more a security may be susceptible to these factors. When the credit spread for a fixed income security goes up, or "widens," the value of the security will generally go down.
	If an issuer or guarantor of a security held by the Fund or a counterparty to a financial contract with the Fund defaults on its obligation to pay principal and/or interest, has its credit rating downgraded or is perceived to be less creditworthy, or the credit quality or value of any underlying assets declines, the value of your investment will typically decline. Changes in actual or perceived creditworthiness may occur quickly. The Fund could be delayed or hindered in its enforcement of rights against an issuer, guarantor or counterparty.
	The Fund’s investments in foreign markets and countries with limited developing markets may subject the Fund to a greater degree of risk than investments in a developed market. These risks include disruptive political or economic conditions, military conflicts and sanctions,

Pioneer Securitized Income Fund | Annual Report | 7/31/2335

Table of Contents

	terrorism, sustained economic downturns, financial instability, less liquid trading markets, extreme price volatility, currency risks, reduction of government or central bank support, inadequate accounting standards, tariffs, tax disputes or other tax burdens, nationalization or expropriation of assets and the imposition of adverse governmental laws, arbitrary application of laws and regulations or lack of rule of law and investment and repatriation restrictions. Lack of information and less market regulation also may affect the value of these securities. Withholding and other non-U.S. taxes may decrease the Fund’s return. Non-U.S. issuers may be located in parts of the world that have historically been prone to natural disasters. Investing in depositary receipts is subject to many of the same risks as investing directly in non-U.S. issuers. Depositary receipts may involve higher expenses and may trade at a discount (or premium) to the underlying security.
	Russia launched a large-scale invasion of Ukraine on February 24, 2022. In response to the military action by Russia, various countries, including the U.S., the United Kingdom, and European Union issued broad-ranging economic sanctions against Russia and Belarus and certain companies and individuals. Since then, Russian securities have lost all, or nearly all, their market value, and many other issuers, securities and markets have been adversely affected. The United States and other countries may impose sanctions on other countries, companies and individuals in light of Russia’s military invasion. The extent and duration of the military action or future escalation of such hostilities, the extent and impact of existing and future sanctions, market disruptions and volatility, and the result of any diplomatic negotiations cannot be predicted. These and any related events could have a significant impact on the value and liquidity of certain Fund investments, on Fund performance and the value of an investment in the Fund, particularly with respect to securities and commodities, such as oil, natural gas and food commodities, as well as other sectors with exposure to Russian issuers or issuers in other countries affected by the invasion, and are likely to have collateral impacts on market sectors globally.
	The Fund invests in below-investment-grade (high-yield) debt securities and preferred stocks. Some of these high-yield securities may be convertible into equity securities of the issuer. Debt securities rated below-investment-grade are commonly referred to as “junk bonds” and are considered speculative with respect to the issuer’s capacity to pay interest and repay principal. These securities involve greater risk of loss, are subject to greater price volatility, and may be less liquid and more difficult to value, especially during periods of economic uncertainty or change, than higher rated debt securities.

36Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

	Normally, the Fund invests at least 80% of its net assets in securitized asset instruments. The Fund invests in mortgage-related and asset-backed securities. The value of mortgage-related and asset-backed securities will be influenced by factors affecting the assets underlying such securities. As a result, during periods of declining asset value, difficult or frozen credit markets, swings in interest rates, or deteriorating economic conditions, mortgage-related and asset-backed securities may decline in value, face valuation difficulties, become more volatile and/or become illiquid. Mortgage-backed securities tend to be more sensitive to changes in interest rate than other types of debt securities. These securities are also subject to prepayment and extension risks. Some of these securities may receive little or no collateral protection from the underlying assets and are thus subject to the risk of default. The risk of such defaults is generally higher in the case of mortgage-backed investments offered by non-governmental issuers and those that include so-called “sub-prime” mortgages. The structure of some of these securities may be complex and there may be less available information than for other types of debt securities. Upon the occurrence of certain triggering events or defaults, the Fund may become the holder of underlying assets at a time when those assets may be difficult to sell or may be sold only at a loss.
	The Fund may invest in credit risk transfer securities. Credit risk transfer securities are unguaranteed and unsecured debt securities issued by government sponsored enterprises and therefore are not directly linked to or backed by the underlying mortgage loans. As a result, in the event that a government sponsored enterprise fails to pay principal or interest on its credit risk transfer securities or goes through a bankruptcy, insolvency or similar proceeding, holders of such credit risk transfer securities have no direct recourse to the underlying mortgage loans and will generally receive recovery on par with other unsecured note holders in such a scenario. The risks associated with an investment in credit risk transfer securities are different than the risks associated with an investment in mortgage-backed securities issued by Fannie Mae and Freddie Mac, or other government sponsored enterprise or issued by a private issuer, because some or all of the mortgage default or credit risk associated with the underlying mortgage loans is transferred to investors. As a result, investors in these securities could lose some or all of their investment in these securities if the underlying mortgage loans default.
	The Fund's investments, payment obligations and financing terms may be based on floating rates, such as LIBOR (London Interbank Offered Rate) or SOFR (Secured Overnight Financing Rate). ICE Benchmark

Pioneer Securitized Income Fund | Annual Report | 7/31/2337

Table of Contents

Administration, the administrator of LIBOR, has ceased publication of most LIBOR settings on a representative basis. Actions by regulators have resulted in the establishment of alternative reference rates to LIBOR in most major currencies. In the U.S., a common benchmark replacement is based on the SOFR published by the Federal Reserve Bank of New York, including certain spread adjustments and benchmark replacement conforming changes, although other benchmark replacements (without or without spread adjustments) may be used in certain transactions. The impact of the transition from LIBOR on the Fund's transactions and financial markets generally cannot yet be determined. The transition away from LIBOR may lead to increased volatility and illiquidity in markets for instruments that have relied on LIBOR and may adversely affect the Fund's performance.

With the increased use of technologies such as the Internet to conduct business, the Fund is susceptible to operational, information security and related risks. While the Fund’s Adviser has established business continuity plans in the event of, and risk management systems to prevent, limit or mitigate, such cyber-attacks, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund such as the Fund’s custodian and accounting agent, and the Fund’s transfer agent. In addition, many beneficial owners of Fund shares hold them through accounts at broker-dealers, retirement platforms and other financial market participants over which neither the Fund nor the Adviser exercises control. Each of these may in turn rely on service providers to them, which are also subject to the risk of cyber-attacks. Cybersecurity failures or breaches at the Adviser or the Fund’s service providers or intermediaries have the ability to cause disruptions and impact business operations, potentially resulting in financial losses, interference with the Fund’s ability to calculate its net asset value, impediments to trading, the inability of Fund shareowners to effect share purchases, redemptions or exchanges or receive distributions, loss of or unauthorized access to private shareowner information and violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, or additional compliance costs. Such costs and losses may not be covered under any insurance. In addition, maintaining vigilance against cyber-attacks may involve substantial costs over time, and system enhancements may themselves be subject to cyber-attacks.

38Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

	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.
G.	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 July 31, 2023 is recorded as "Futures collateral" on the Statement of Assets and Liabilities.
	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. Cash received from or paid to the broker related to previous margin movement is held in a segregated account at the broker and is recorded as either "Due from broker for futures" or "Due to broker for futures" on the Statement of Assets and Liabilities. 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. 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. With futures, there is reduced counterparty credit risk to the Fund since futures are exchange-traded and the exchange's clearinghouse, as counterparty to all exchange-traded futures, guarantees the futures against default.
	The average notional value of futures contracts long position during the year ended July 31, 2023 was $3,505,349. Open futures contracts outstanding at July 31, 2023 are listed in the Schedule of Investments.

2. Management Agreement

Pioneer Securitized Income Fund | Annual Report | 7/31/2339

Table of Contents

average daily net assets up to $1 billion and 0.50% of the Fund’s average daily net assets over $1 billion. For the year ended July 31, 2023, the effective management fee (excluding waivers and/or assumption of expenses) was equivalent to 0.55% of the Fund's average daily net assets.

The 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 0.90% and 0.65% of the average daily net assets attributable to Class A and Class Y shares, respectively. These expense limitations are in effect through December 1, 2023. There can be no assurance that the Adviser will extend the expense limitations beyond the date referred to above. Fees waived and expenses reimbursed during the year ended July 31, 2023 are reflected in the Statement of Operations.

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. Reflected on the Statement of Assets and Liabilities is $1,773 in management fees payable to the Adviser at July 31, 2023.

3. Compensation of Officers and Trustees

The Fund pays an annual fee to its Trustees. The Adviser reimburses the Fund for fees paid to the Interested Trustees. Except for the chief compliance officer, the Fund does not pay any salary or other compensation to its officers. The Fund pays a portion of the chief compliance officer's compensation for his services as the Fund's chief compliance officer. Amundi US pays the remaining portion of the chief compliance officer's compensation. For the year ended July 31, 2023, the Fund paid $8,073 in Officers' and Trustees' compensation, which is reflected on the Statement of Operations as Officers' and Trustees' fees. At July 31, 2023, on its Statement of Assets and Liabilities, the Fund had a payable for Trustees' fees of $570 and had no payable for administrative expenses which includes the payable for Officers' compensation.

4. Transfer Agent

40Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Shareowner Communications:
Class A	$ 73
Class Y	2,243
Total	$2,316

5. Distribution Plan

The Fund has adopted a distribution plan (the “Plan”) pursuant to Rule 12b-1 under the 1940 Act with respect to its Class A shares. Pursuant to the Plan, the Fund pays the Distributor 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. Reflected on the Statement of Assets and Liabilities is $72 in distribution fees payable to the Distributor at July 31, 2023.

In addition, redemptions of each Class A 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. 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 Y shares. Proceeds from the CDSCs are paid to the Distributor. For the year ended July 31, 2023, CDSCs in the amount of $0 were paid to the Distributor.

6. Additional Disclosures about Derivative Instruments and Hedging Activities

The Fund’s use of derivatives may enhance or mitigate the Fund’s exposure to the following risks:

Interest rate risk relates to the ﬂuctuations in the value of interest-bearing securities due to changes in the prevailing levels of market interest rates.

Credit risk relates to the ability of the issuer of a ﬁnancial instrument to make further principal or interest payments on an obligation or commitment that it has to the Fund.

Foreign exchange rate risk relates to ﬂuctuations in the value of an asset or liability due to changes in currency exchange rates.

Equity risk relates to the ﬂuctuations in the value of ﬁnancial instruments as a result of changes in market prices (other than those arising from

Pioneer Securitized Income Fund | Annual Report | 7/31/2341

Table of Contents

interest rate risk or foreign exchange rate risk), whether caused by factors speciﬁc to an individual investment, its issuer, or all factors affecting all instruments traded in a market or market segment.

The fair value of open derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) by risk exposure at July 31, 2023, was as follows:

Statement of Assets and Liabilities	Interest Rate Risk	Credit Risk	Foreign Exchange Rate Risk	Equity Risk	Commodity Risk
Liabilities
Net unrealized depreciation on futures contracts*	$170,314	$ —	$ —	$ —	$ —
Total Value	$ 170,314	$—	$—	$—	$—


*	Includes cumulative unrealized appreciation (depreciation) of futures contracts as reported in the Schedule of Investments. Only net variation margin is reported within the assets and/or liabilities on the Statement of Assets and Liabilities.

The effect of derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) on the Statement of Operations by risk exposure at July 31, 2023 was as follows:

Statement of Operations	Interest Rate Risk	Credit Risk	Foreign Exchange Rate Risk	Equity Risk	Commodity Risk
Net Realized Gain (Loss) on
Futures contracts	$ (132,207)	$ —	$ —	$ —	$ —
Total Value	$(132,207)	$—	$—	$—	$—
Change in Net Unrealized Appreciation (Depreciation) on
Futures contracts	$ (170,314)	$ —	$ —	$ —	$ —
Total Value	$ (170,314)	$—	$—	$—	$—

42Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Report of Independent Registered Public Accounting Firm

To the Board of Trustees of Pioneer Series Trust IV and the Shareholders of Pioneer Securitized Income Fund:

Opinion on the Financial Statements

We have audited the accompanying statement of assets and liabilities of Pioneer Securitized Income Fund (the “Fund”) (one of the funds constituting Pioneer Series Trust IV (the “Trust”)), including the schedule of investments, as of July 31 2023, and the related statement of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, the financial highlights for each of the three years in the period ended July 31, 2023 and the period from December 10, 2019 (commencement of operations) through July 31, 2020, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Fund (one of the funds constituting Pioneer Series Trust IV) at July 31, 2023, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended, and its financial highlights for each of the three years in the period ended July 31, 2023 and the period from December 10, 2019 (commencement of operations) through July 31, 2020, in conformity with U.S. generally accepted accounting principles.

Basis for Opinion

Pioneer Securitized Income Fund | Annual Report | 7/31/2343

Table of Contents

effectiveness of the Trust’s internal control over financial reporting. Accordingly, we express no such opinion.

We have served as the auditor of one or more investment companies in the Pioneer family of funds since 2017.

Boston, Massachusetts
September 29, 2023

44Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Additional Information (unaudited)

The Fund designated $428,448 as long-term capital gains distributions during the year ended July 31, 2023. Distributable long-term gains are based on net realized long-term gains determined on a tax basis and may differ from such amounts for financial reporting purposes.

Qualified interest income is exempt from nonresident alien (NRA) tax withholding. The percentage of the Fund’s ordinary income distributions derived from qualified interest income was 80.45%.

Pioneer Securitized Income Fund | Annual Report | 7/31/2345

Table of Contents

Statement Regarding Liquidity Risk Management Program

The Report discussed the Committee’s annual review of the Program, which addressed, among other things, the following elements of the Program:

46Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Pioneer Securitized Income Fund | Annual Report | 7/31/23 47

Table of Contents

Trustees, Officers and Service Providers

Investment Adviser and Administrator
Amundi Asset Management US, Inc.

Custodian and Sub-Administrator
The Bank of New York Mellon Corporation

Independent Registered Public Accounting Firm
Ernst & Young LLP

Principal Underwriter
Amundi Distributor US, Inc.

Legal Counsel
Morgan, Lewis & Bockius LLP

Transfer Agent
BNY Mellon Investment Servicing (US) Inc.

Trustees and Officers

The Statement of Additional Information of the Fund includes additional information about the Directors and is available, without charge, upon request, by calling 1-800-225-6292.

48Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Independent Trustees

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Thomas J. Perna (72) Chairman of the Board and Trustee	Trustee since 2019. Serves until a successor trustee is elected or earlier retirement or removal.	Private investor (2004 – 2008 and 2013 – present); Chairman (2008 – 2013) and Chief Executive Officer (2008 – 2012), Quadriserv, Inc. (technology products for securities lending industry); and Senior Executive Vice President, The Bank of New York (financial and securities services) (1986 – 2004)	Director, Broadridge Financial Solutions, Inc. (investor communications and securities processing provider for financial services industry) (2009 – present); Director, Quadriserv, Inc. (2005 – 2013); and Commissioner, New Jersey State Civil Service Commission (2011 – 2015)
John E. Baumgardner, Jr. (72)* Trustee	Trustee since 2019. Serves until a successor trustee is elected or earlier retirement or removal.	Of Counsel (2019 – present), Partner (1983-2018), Sullivan & Cromwell LLP (law firm).	Chairman, The Lakeville Journal Company, LLC, (privately-held community newspaper group) (2015-present)
Diane Durnin (66) Trustee	Trustee since 2019. Serves until a successor trustee is elected or earlier retirement or removal.	Managing Director - Head of Product Strategy and Development, BNY Mellon Investment Management (investment management firm) (2012-2018); Vice Chairman – The Dreyfus Corporation (2005 – 2018): Executive Vice President Head of Product, BNY Mellon Investment Management (2007-2012); Executive Director- Product Strategy, Mellon Asset Management (2005-2007); Executive Vice President Head of Products, Marketing and Client Service, Dreyfus Corporation (investment management firm) (2000-2005); Senior Vice President Strategic Product and Business Development, Dreyfus Corporation (1994-2000)	None
* Mr. Baumgardner is Of Counsel to Sullivan & Cromwell LLP, which acts as counsel to the Independent Trustees of each Pioneer Fund.

Pioneer Securitized Income Fund | Annual Report | 7/31/2349

Table of Contents

Independent Trustees (continued)

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Benjamin M. Friedman (78) Trustee	Trustee since 2019. Serves until a successor trustee is elected or earlier retirement or removal.	William Joseph Maier Professor of Political Economy, Harvard University (1972 – present)	Trustee, Mellon Institutional Funds Investment Trust and Mellon Institutional Funds Master Portfolio (oversaw 17 portfolios in fund complex) (1989 - 2008)
Craig C. MacKay (60) Trustee	Trustee since 2021. Serves until a successor trustee is elected or earlier retirement or removal.	Partner, England & Company, LLC (advisory firm) (2012 – present); Group Head – Leveraged Finance Distribution, Oppenheimer & Company (investment bank) (2006 – 2012); Group Head – Private Finance & High Yield Capital Markets Origination, SunTrust Robinson Humphrey (investment bank) (2003 – 2006); and Founder and Chief Executive Officer, HNY Associates, LLC (investment bank) (1996 – 2003)	Director, Equitable Holdings, Inc. (financial services holding company) (2022 – present); Board Member of Carver Bancorp, Inc. (holding company) and Carver Federal Savings Bank, NA (2017 – present); Advisory Council Member, MasterShares ETF (2016 – 2017); Advisory Council Member, The Deal (financial market information publisher) (2015 – 2016); Board Co-Chairman and Chief Executive Officer, Danis Transportation Company (privately-owned commercial carrier) (2000 – 2003); Board Member and Chief Financial Officer, Customer Access Resources (privately-owned teleservices company) (1998 – 2000); Board Member, Federation of Protestant Welfare Agencies (human services agency) (1993 – present); and Board Treasurer, Harlem Dowling Westside Center (foster care agency) (1999 – 2018)

50Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Lorraine H. Monchak (67) Trustee	Trustee since 2019. (Advisory Trustee from 2014 - 2017). Serves until a successor trustee is elected or earlier retirement or removal.	Chief Investment Officer, 1199 SEIU Funds (healthcare workers union pension funds) (2001 – present); Vice President – International Investments Group, American International Group, Inc. (insurance company) (1993 – 2001); Vice President Corporate Finance and Treasury Group, Citibank, N.A. (1980 – 1986 and 1990 – 1993); Vice President – Asset/Liability Management Group, Federal Farm Funding Corporation (government-sponsored issuer of debt securities) (1988 – 1990); Mortgage Strategies Group, Shearson Lehman Hutton, Inc. (investment bank) (1987 – 1988); Mortgage Strategies Group, Drexel Burnham Lambert, Ltd. (investment bank) (1986 – 1987)	None
Marguerite A. Piret (75) Trustee	Trustee since 2019. Serves until a successor trustee is elected or earlier retirement or removal.	Chief Financial Officer, American Ag Energy, Inc. (technology for the environment, energy and agriculture) (2019 – present); Chief Operating Officer, North Country Growers LLC (controlled environment agriculture company) (2020 – present); Chief Executive Officer, Green Heat LLC (biofuels company) (2022 – present); President and Chief Executive Officer, Newbury Piret Company (investment banking firm) (1981 – 2019)	Director of New America High Income Fund, Inc. (closed-end investment company) (2004 – present); and Member, Board of Governors, Investment Company Institute (2000 – 2006)

Pioneer Securitized Income Fund | Annual Report | 7/31/2351

Table of Contents

Independent Trustees (continued)

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Fred J. Ricciardi (76) Trustee	Trustee since 2019. Serves until a successor trustee is elected or earlier retirement or removal.	Private investor (2020 – present); Consultant (investment company services) (2012 – 2020); Executive Vice President, BNY Mellon (financial and investment company services) (1969 – 2012); Director, BNY International Financing Corp. (financial services) (2002 – 2012); Director, Mellon Overseas Investment Corp. (financial services) (2009 – 2012); Director, Financial Models (technology) (2005-2007); Director, BNY Hamilton Funds, Ireland (offshore investment companies) (2004-2007); Chairman/Director, AIB/BNY Securities Services, Ltd., Ireland (financial services) (1999-2006); Chairman, BNY Alternative Investment Services, Inc. (financial services) (2005-2007)	None

52Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Interested Trustees

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Lisa M. Jones (61)** Trustee, President and Chief Executive Officer	Trustee since 2019. Serves until a successor trustee is elected or earlier retirement or removal	Director, CEO and President of Amundi US, Inc. (investment management firm) (since September 2014); Director, CEO and President of Amundi Asset Management US, Inc. (since September 2014); Director, CEO and President of Amundi Distributor US, Inc. (since September 2014); Director, CEO and President of Amundi Asset Management US, Inc. (since September 2014); Chair, Amundi US, Inc., Amundi Distributor US, Inc. and Amundi Asset Management US, Inc. (September 2014 – 2018); Managing Director, Morgan Stanley Investment Management (investment management firm) (2010 – 2013); Director of Institutional Business, CEO of International, Eaton Vance Management (investment management firm) (2005 – 2010); Director of Amundi Holdings US, Inc. (since 2017)	Director of Clearwater Analytics (provider of web-based investment accounting software for reporting and reconciliation services) (September 2022 – present)
Kenneth J. Taubes (65)** Trustee	Trustee since 2019. Serves until a successor trustee is elected or earlier retirement or removal	Director and Executive Vice President (since 2008) and Chief Investment Officer, U.S. (since 2010) of Amundi US, Inc. (investment management firm); Director and Executive Vice President and Chief Investment Officer, U.S. of Amundi US (since 2008); Executive Vice President and Chief Investment Officer, U.S. of Amundi Asset Management US, Inc. (since 2009); Portfolio Manager of Amundi US (since 1999); Director of Amundi Holdings US, Inc. (since 2017)	None
** Ms. Jones and Mr. Taubes are Interested Trustees because they are officers or directors of the Fund’s investment adviser and certain of its affiliates.

Pioneer Securitized Income Fund | Annual Report | 7/31/2353

Table of Contents

Fund Officers

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Officer During At Least The Past Five Years
Christopher J. Kelley (58) Secretary and Chief Legal Officer	Since 2019. Serves at the discretion of the Board	Vice President and Associate General Counsel of Amundi US since January 2008; Secretary and Chief Legal Officer of all of the Pioneer Funds since June 2010; Assistant Secretary of all of the Pioneer Funds from September 2003 to May 2010; Vice President and Senior Counsel of Amundi US from July 2002 to December 2007	None
Thomas Reyes (60) Assistant Secretary	Since 2019. Serves at the discretion of the Board	Assistant General Counsel of Amundi US since May 2013 and Assistant Secretary of all the Pioneer Funds since June 2010; Counsel of Amundi US from June 2007 to May 2013	None
Heather L. Melito-Dezan (46) Assistant Secretary	Since 2022. Serves at the discretion of the Board	Director - Trustee and Board Relationships of Amundi US since September 2019; Assistant Secretary of Amundi US, Inc. since July 2020: Assistant Secretary of Amundi Asset Management US, Inc. since July 2020: Assistant Secretary of Amundi Distributor US, Inc. since July 2020; Assistant Secretary of all the Pioneer Funds since September 2022; Private practice from 2017 – 2019.	None
Anthony J. Koenig, Jr. (59) Treasurer and Chief Financial and Accounting Officer	Since 2021. Serves at the discretion of the Board	Managing Director, Chief Operations Officer and Fund Treasurer of Amundi US since May 2021; Treasurer of all of the Pioneer Funds since May 2021; Assistant Treasurer of all of the Pioneer Funds from January 2021 to May 2021; and Chief of Staff, US Investment Management of Amundi US from May 2008 to January 2021	None
Luis I. Presutti (58) Assistant Treasurer	Since 2005. Serves at the discretion of the Board	Director – Fund Treasury of Amundi US since 1999; and Assistant Treasurer of all of the Pioneer Funds since 1999	None
Gary Sullivan (65) Assistant Treasurer	Since 2019. Serves at the discretion of the Board	Senior Manager – Fund Treasury of Amundi US since 2012; and Assistant Treasurer of all of the Pioneer Funds since 2002	None

54Pioneer Securitized Income Fund | Annual Report | 7/31/23

Table of Contents

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Officer During At Least The Past Five Years
Antonio Furtado (41) Assistant Treasurer	Since 2020. Serves at the discretion of the Board	Fund Oversight Manager – Fund Treasury of Amundi US since 2020; Assistant Treasurer of all of the Pioneer Funds since 2020; and Senior Fund Treasury Analyst from 2012 - 2020	None
Michael Melnick (52) Assistant Treasurer	Since 2021. Serves at the discretion of the Board	Vice President - Deputy Fund Treasurer of Amundi US since May 2021; Assistant Treasurer of all of the Pioneer Funds since July 2021; Director of Regulatory Reporting of Amundi US from 2001 – 2021; and Director of Tax of Amundi US from 2000 - 2001	None
John Malone (52) Chief Compliance Officer	Since 2019. Serves at the discretion of the Board	Managing Director, Chief Compliance Officer of Amundi US Asset Management; Amundi Asset Management US, Inc.; and the Pioneer Funds since September 2018; Chief Compliance Officer of Amundi Distributor US, Inc. since January 2014.	None
Brandon Austin (51) Anti-Money Laundering Officer	Since 2022. Serves at the discretion of the Board	Director, Financial Security – Amundi Asset Management; Anti-Money Laundering Officer of all the Pioneer Funds since March 2022: Director of Financial Security of Amundi US since July 2021; Vice President, Head of BSA, AML and OFAC, Deputy Compliance Manager, Crédit Agricole Indosuez Wealth Management (investment management firm) (2013 – 2021)	None

Pioneer Securitized Income Fund | Annual Report | 7/31/2355

Table of Contents

How to Contact Amundi

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^SMfor automated fund yields, prices,
account information and transactions

1-800-225-4321

Retirement plans information

1-800-622-0176

Write to us:

Amundi
P.O. Box 534427
Pittsburgh, PA 15253-4427

Our toll-free fax	1-800-225-4240
Our internet e-mail address	us.askamundi@amundi.com (for general questions about Amundi only)

Visit our web site: www.amundi.com/us

This report must be preceded or accompanied by a prospectus.

Table of Contents

Amundi Asset Management US, Inc.
60 State Street
Boston, MA 02109

www.amundi.com/us

Securities offered through Amundi Distributor US, Inc.
60 State Street, Boston, MA 02109
Underwriter of Pioneer Mutual Funds, Member SIPC
© 2023 Amundi Asset Management US, Inc. 32216-03-0923

Amundi Climate Transition Core Bond Fund

Annual Report | July 31, 2023


A: CTBAX	C: ACTCX	K: ACTKX	Y: CTCYX

visit us: www.amundi.com/us

Table of Contents

President’s Letter	2
Portfolio Management Discussion	4
Portfolio Summary	12
Prices and Distributions	13
Performance Update	14
Comparing Ongoing Fund Expenses	18
Schedule of Investments	20
Financial Statements	28
Notes to Financial Statements	36
Report of Independent Registered Public Accounting Firm	51
Additional Information	53
Statement Regarding Liquidity Risk Management Program	54
Trustees, Officers and Service Providers	56

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/231

Table of Contents

President’s Letter

Dear Shareholders,

2Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

We greatly appreciate the trust you have placed in us and look forward to continuing to serve you in the future.

Lisa M. Jones
Head of the Americas, President and CEO of US
Amundi Asset Management US, Inc.
September 2023

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/233

Table of Contents

Portfolio Management Discussion | 7/31/23

In the following interview, Jonathan Duensing, Bradley Komenda, Jonathan Scott, and Chin Liu discuss the factors that affected the performance of Amundi Climate Transition Core Bond Fund during the abbreviated annual reporting period covering the Fund’s inception date of December 15, 2022 through July 31, 2023. Mr. Duensing, Senior Managing Director, Head of Fixed Income, US, and Director of Multi-Sector Fixed Income of Amundi Asset Management US, Inc. (Amundi US); Mr. Komenda, Managing Director and Director of Investment Grade Corporates of Amundi US; Mr. Scott, Senior Vice President and Deputy Director of Multi-Sector Fixed Income of Amundi US; and Mr. Liu, Managing Director, Director of Insurance-Linked Securities, and Director of Fixed Income Solutions at Amundi US, are responsible for the day-to-day management of the Fund.

Q	How did the Fund perform during the abbreviated annual reporting period between December 15, 2022 and July 31, 2023?
A	Amundi Climate Transition Core Bond Fund’s Class A shares returned -0.46% at net asset value for the period between December 15, 2022 and July 31, 2023, while the Fund’s benchmark, the Bloomberg US Aggregate Bond Index (the Bloomberg Index), returned -0.38%. In addition, for the six-month period between January 31, 2023 and July 31, 2023, the average return of the 627 mutual funds in Morningstar’s Intermediate Core-Plus Bond Category was -0.84%.
Q	Could you describe the Fund’s investment approach?
A	Our investment approach in managing the Fund’s portfolio takes into consideration an investment’s income and return prospects, relative to perceived risk, while also considering its climate-related characteristics. Under normal circumstances, the Fund will invest at least 80% of its net assets (plus the amount of borrowings, if any, for investment purposes) in fixed-income investments that meet Amundi US's climate transition criteria (the “Climate Transition Criteria”). The Climate Transition Criteria are designed to identify investments that have climate-positive characteristics consistent with the transition to a more sustainable economy in terms of lower global greenhouse gas emissions, as considered by Amundi US.
	Investments meeting the Climate Transition Criteria include those whose issuers, in the view of Amundi US, are participating in, or contributing to, the goal of achieving lower carbon emissions;

4Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

	have developed and are implementing a viable sustainability plan; or have low direct carbon emissions or impact. In addition, bonds designed to support the climate transition or other environmental purposes (known as “green bonds”) may meet the Climate Transition Criteria.
Q	How would you describe the investment environment during the abbreviated annual reporting period between December 15, 2022 and July 31, 2023?
A	As inflation showed signs of moderating entering 2023, investors became increasingly optimistic that the US Federal Reserve (Fed) and other leading central banks were poised to stop raising interest rates, which many had been doing since early 2022 as inflation levels rose. January 2023 saw Treasury yields pull back from their more recent highs on the market’s outlook for a potential easing of monetary policy. That, in turn, boosted performance for bonds in general. On February 1, 2023, the Fed increased the federal funds rate target again, but this time by a comparatively moderate 25 basis points (bps), bringing the target range to 4.50% – 4.75%. (A basis point is equal to 1/100^th of a percentage point.)
	The spring of 2023 saw the failure of multiple US banks and the collapse of European giant Credit Suisse, raising the prospect of a financial crisis. In response, the Fed implemented a new lending program to support bank liquidity, while market participants began to anticipate decreases in the federal funds rate target range by the Fed over the second half of the calendar year. At its March 23 meeting, the Fed went forward with another modest 25 bps increase to the federal funds target, bringing the range to 4.75% ‒ 5.00%. The financial markets viewed that increase as an indication that the Fed believed the financial system, overall, remained on solid footing. The Fed would implement another increase to the federal funds target range of 25 bps in early May, bringing the range to 5.00% ‒ 5.25%, before taking a pause at its June meeting. On July 26, however, the Fed increased the federal funds target range by another quarter-point (25 bps), leaving the range at 5.25% ‒ 5.50% as of period-end.
	As of July 31, 2023, the yield for the two-year US Treasury note was 4.88%, versus 4.23% as of December 15, 2022, an increase of

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/235

Table of Contents

	65 bps. Meanwhile, the 10-year Treasury yield finished the period 53 bps higher, at 3.97%, versus 3.44% at the start of the period in mid-December. As a result, the Treasury yield curve ended the period significantly inverted, a development that has typically been viewed as a predictor of recession. (A yield curve is a line that plots the interest rates, at a set point in time, of bonds having equal credit quality but differing maturity dates. An inverted yield curve represents a yield curve where shorter-term yields are higher than longer-term yields.)
	The upward move in interest rates weighed on returns in the overall bond market during the abbreviated reporting period. The investment-grade corporate bond market, as gauged by the Fund’s benchmark, the Bloomberg Index, posted a return of -0.38% for the abbreviated reporting period, with corporate bonds generating a positive return and notably outperforming more interest-rate-sensitive securities, such as US Treasuries and securitized assets. Below-investment-grade, high-yield corporate bonds also outperformed for the abbreviated period, on the strength of credit-spread tightening. (Credit spreads are commonly defined as the differences in yield between Treasuries and other types of fixed-income securities with similar maturities.)
Q	What factors influenced the Fund’s performance relative to the Bloomberg Index during the abbreviated annual reporting period between December 15, 2022 and July 31, 2023?
A	A portfolio overweight to agency mortgage-backed securities (MBS), as well as duration positioning, were key detractors from the Fund’s benchmark-relative returns for the period. On the other hand, sector allocation results, security selection results, and the portfolio’s yield-curve positioning all contributed positively to the Fund’s benchmark-relative performance during the reporting period.
	In terms of sector allocation, the Fund’s benchmark-relative returns benefited from the portfolio’s underweight to Treasuries versus the Bloomberg Index, as credit spreads tightened during the reporting period. Within corporate credit, the Fund’s substantial overweight to financials, driven by the portfolio’s exposure to large, systemically important banks, was a positive

6Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

	contributor to benchmark-relative performance, as those issuers overcame the market’s concerns about a financial crisis that had hampered the sector during the spring of 2023.
	With regard to the underperformance of the Fund’s agency MBS exposures, the issues that plagued the banking system during the spring put pressure on spreads and increased volatility in the sector, as the Federal Deposit Insurance Corporation (FDIC) began liquidating portfolios with large MBS exposures acquired from the failed banks.
	In terms of security selection, within the Fund’s allocation to corporate bonds, benchmark-relative results benefited the most from holdings of industrial issuers, where the portfolio’s exposure to the debt of an aircraft manufacturer and to some non-US banks highlighted positive contributions. Security selection results within the portfolio's allocation to commercial MBS (CMBS) also aided the Fund's benchmark-relative returns.
	Another positive contributor to the Fund’s benchmark-relative performance was the portfolio’s yield-curve positioning, where an overweight to securities with longer maturities was beneficial, as prices for that segment of the yield curve rose as the curve flattened, while the opposite was true for securities with shorter maturities.
	Finally, the portfolio’s long-duration (above-benchmark) stance versus the Bloomberg Index detracted from the Fund’s benchmark-relative results in a reporting period featuring a rising interest-rate environment. (Duration is a measure of the sensitivity of the price, or the value of principal, of a fixed-income investment to a change in interest rates, expressed as a number of years.)
Q	Did the Fund have any exposure to derivative securities during the abbreviated annual reporting period between December 15, 2022 and July 31, 2023?
A	Yes, we invested the Fund in Treasury futures during the period. We use Treasury futures as part of our duration/interest-rate-management approach for the portfolio. We believe the use of Treasury futures allows us to express our views on duration and yield-curve positioning in the most efficient manner. We also

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/237

Table of Contents

	believe the use of derivatives facilitates efficient portfolio construction. The use of derivatives had essentially a neutral effect on the Fund’s performance during the reporting period, given that yield-curve positioning benefited relative returns, and duration positioning detracted from relative results.
Q	Can you discuss the factors that affected the Fund’s income generation, or distributions* to shareholders, during the abbreviated annual reporting period between December 15, 2022 and July 31, 2023?
A	The Fund’s monthly distribution rate increased over the reporting period. While the Treasury yield curve finished the period higher than where it began one year ago, most notably on the short end, tightening credit spreads seen across both corporate credit and securitized assets partially offset those effects.
Q	What is your investment outlook?
A	With elevated inflation proving to be sticky and the Fed committed to bringing inflation down to its 2% long-term target, we believe the federal funds rate target range will remain “higher for longer.” The market now appears to agree with this view, as expectations for the Fed’s first interest-rate cut have been pushed out to May 2024. We believe financial conditions will become more restrictive, and that the likelihood of a recession has increased as banks have tightened lending standards and as the Fed has maintained higher rates, given lingering inflation concerns. Consequently, we expect to maintain a relatively defensive posture in the portfolio as recession risks increase over the remainder of the calendar year, with weak manufacturing activity and higher mortgage rates weighing on the economy.
	As is typically the case during recessions, we would expect some credit-oriented bond issuers to face pressures, which could lead to increased ratings downgrades. However, we do not expect a deep recession, such as during the global financial crisis (GFC) of 2008. In our opinion, the economy will likely be on the upswing and the default rate headed lower at some point in 2024. We expect that by 2024 inflation will have fallen closer to the Fed’s targeted 2% area and that Treasury yields will be lower than

*	Distributions are not guaranteed.

8Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

today’s levels. In that scenario, we expect the default rate to remain lower than what we saw in the wake of the GFC.

In our view, US fixed-income duration exposures remain attractive in both nominal and inflation-indexed terms. As spreads in credit-oriented sectors have narrowed back to early March (pre-bank crisis) levels, we have been selectively reducing the size of the Fund’s corporate, securitized credit, and agency MBS allocations. However, we anticipate the Fund’s fixed-income positioning to continue actively evolving along with shifts in our outlook, and our views on relative valuations.

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/239

Table of Contents

Please refer to the Schedule of Investments on pages 20 - 27 for a full listing of Fund securities.

Investments in high-yield or lower rated securities are subject to greater-than-average price volatility, illiquidity and possibility of default.

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.

Investing in foreign and/or emerging markets securities involves risks relating to interest rates, currency exchange rates, economic, and political conditions.

The Fund’s consideration of the Climate Transition Criteria will result in the exclusion of investments the issuers of which do not meet such criteria. Additionally, to the extent that other ESG information is considered, such other ESG information may also result in the exclusion of investments.

Excluding specific issuers limits the universe of investments available to the Fund, which may mean forgoing some investment opportunities available to funds that do not consider such criteria or information.

10Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

Accordingly, the Fund may underperform other funds that do not utilize such an investment strategy or ESG information.

The focus on the carbon and climate-related characteristics of issuers may increase the Fund’s exposure to certain investments.

The Fund is more susceptible to events or factors adversely affecting such investments, such as a decrease in support for climate-related or environmental initiatives or an increase in the cost of implementing climate-related initiatives.

Certain securities and derivatives held by the Fund may be or become impossible or difficult to purchase, sell, or unwind. Such securities may also be difficult to value.

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2311

Table of Contents

Portfolio Summary | 7/31/23

Portfolio Diversification

(As a percentage of total investments)*

10 Largest Holdings

(As a percentage of total investments)*
1.	European Investment Bank, 2.125%, 4/13/26	4.10%
2.	Federal Home Loan Mortgage Corp., 3.50%, 6/1/52	3.70
3.	Federal Home Loan Mortgage Corp., 5.50%, 2/1/53	3.68
4.	Federal National Mortgage Association, 2.00%, 2/1/52	3.66
5.	Federal Home Loan Mortgage Corp., 5.00%, 2/1/53	3.62
6.	Federal Home Loan Mortgage Corp., 3.00%, 4/1/42	3.62
7.	Federal Home Loan Mortgage Corp., 2.50%, 3/1/52	3.59
8.	Federal Home Loan Mortgage Corp., 1.50%, 3/1/37	3.59
9.	Federal National Mortgage Association, 2.50%, 4/1/52	3.50
10.	U.S. Treasury Bonds, 4.00%, 11/15/52	3.22


*	Excludes short-term investments and all derivative contracts except for options purchased. The Fund is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any securities.

12Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

Prices and Distributions | 7/31/23

Net Asset Value per Share

Class	7/31/23	12/15/22*
A	$9.75	$10.00
C	$9.75	$10.00
K	$9.75	$10.00
Y	$9.75	$10.00

Distributions per Share: 12/15/22* - 7/31/23

Class	Net Investment Income	Short-Term Capital Gains	Long-Term Capital Gains
A	$0.2143	$—	$—
C	$0.1710	$—	$—
K	$0.2290	$—	$—
Y	$0.2290	$—	$—

* The Fund commenced operations on December 15, 2022.

Index Definition

The Bloomberg U.S. Aggregate Bond Index is an unmanaged measure of the US bond market. Indices are unmanaged and their returns assume reinvestment of dividends and do not reflect any fees or expenses. 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 14 - 17.

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2313

Table of Contents

Performance Update | 7/31/23

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 Amundi Climate Transition Core Bond Fund at public offering price during the periods shown, compared to that of the Bloomberg U.S. Aggregate Bond Index.*

Average Annual Total Returns (As of July 31, 2023)
Period	Net Asset Value (NAV)	Public Offering Price (POP)	Bloomberg U.S. Aggregate Bond Index
Since Inception (12/15/22)	-0.36%	-4.84%	-0.38%

Expense Ratio (Per prospectus dated October 18, 2022)
Gross	Net
1.61%	0.73%

Value of $10,000 Investment

Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.

The net expense ratio reflects the contractual expense limitation currently in effect through December 1, 2025 for Class A shares. There can be no assurance that Amundi US will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information.

* Performance of Class A shares of the Fund shown in the graph above is from the inception of Class A shares on 12/15/22 through 7/31/23. Index information shown in the graph above is from 12/31/22 through 7/31/23.

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.

Please refer to the financial highlights for more current expense ratios.

14Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

Performance Update | 7/31/23

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 Amundi Climate Transition Core Bond Fund during the periods shown, compared to that of the Bloomberg U.S. Aggregate Bond Index.*

Average Annual Total Returns (As of July 31, 2023)
Period	If Held	If Redeemed	Bloomberg U.S. Aggregate Bond Index
Since Inception (12/15/22)	-0.80%	-1.77%	-0.38%

Expense Ratio (Per prospectus dated October 18, 2022)
Gross	Net
2.36%	1.48%

Value of $10,000 Investment

Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.

Class C shares held for less than one year are subject to a 1% contingent deferred sales charge (CDSC). “If Held” results represent the percent change in net asset value per share. "If Redeemed" returns reflect the deduction of the CDSC for periods up to one year, assuming a complete redemption of shares at the last price calculated on the last business day of the period, and no CDSC for the other time periods. 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.

The net expense ratio reflects the contractual expense limitation currently in effect through December 1, 2025 for Class C shares. There can be no assurance that Amundi US will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information.

* Performance of Class C shares of the Fund shown in the graph above is from the inception of Class C shares on 12/15/22 through 7/31/23. Index information shown in the graph above is from 12/31/22 through 7/31/23.

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.

Please refer to the financial highlights for more current expense ratios.

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2315

Table of Contents

Performance Update | 7/31/23

Class K Shares

Investment Returns

The mountain chart on the right shows the change in value of a $5 million investment made in Class K shares of Amundi Climate Transition Core Bond Fund during the periods shown, compared to that of the Bloomberg U.S. Aggregate Bond Index.*

Average Annual Total Returns (As of July 31, 2023)
Period	Net Asset Value (NAV)	Bloomberg U.S. Aggregate Bond Index
Since Inception (12/15/22)	-0.21%	-0.38%

Expense Ratio (Per prospectus dated October 18, 2022)
Gross	Net
1.23%	0.45%

Value of $5 Million Investment

Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.

The performance shown for 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. Other share classes are available for which performance and expenses will differ.

The net expense ratio reflects the contractual expense limitation currently in effect through December 1, 2025 for Class K shares. There can be no assurance that Amundi US will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information.

* Performance of Class K shares of the Fund shown in the graph above is from the inception of Class K shares on 12/15/22 through 7/31/23. Index information shown in the graph above is from 12/31/22 through 7/31/23.

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.

Please refer to the financial highlights for more current expense ratios.

16Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

Performance Update | 7/31/23

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 Amundi Climate Transition Core Bond Fund during the periods shown, compared to that of the Bloomberg U.S. Aggregate Bond Index.*

Average Annual Total Returns (As of July 31, 2023)
Period	Net Asset Value (NAV)	Bloomberg U.S. Aggregate Bond Index
Since Inception (12/15/22)	-0.21%	-0.38%

Expense Ratio (Per prospectus dated October 18, 2022)
Gross	Net
1.35%	0.45%

Value of $5 Million Investment

Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.

The net expense ratio reflects the contractual expense limitation currently in effect through December 1, 2025 for Class Y shares. There can be no assurance that Amundi US will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information.

* Performance of Class Y shares of the Fund shown in the graph above is from the inception of Class Y shares on 12/15/22 through 7/31/23. Index information shown in the graph above is from 12/31/22 through 7/31/23.

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.

Please refer to the financial highlights for more current expense ratios.

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2317

Table of Contents

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.

Using the Tables

Actual Expenses

(1)	Divide your account value by $1,000 Example: an $8,600 account value ÷ $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 Amundi Climate Transition Core Bond Fund

Based on actual returns from February 1, 2023 through July 31, 2023.

Share Class	A	C	K	Y
Beginning Account Value on 12/15/22	$1,000.00	$1,000.00	$1,000.00	$1,000.00
Ending Account Value (after expenses) on 7/31/23	$996.40	$992.00	$997.90	$997.90
Expenses Paid During Period*	$2.28	$5.98	$1.04	$1.04


*	Expenses are equal to the Fund’s annualized expense ratio of 0.46%, 1.21%, 0.21%, and 0.21% for Class A, Class C, Class K, and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 181/365 (to reflect the one-half year period).

18Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

Hypothetical Example for Comparison Purposes

Expenses Paid on a $1,000 Investment in Amundi Climate Transition Core Bond Fund

Based on a hypothetical 5% return per year before expenses, reflecting the period from February 1, 2023 through July 31, 2023.

Share Class	A	C	K	Y
Beginning Account Value on 2/1/23	$1,000.00	$1,000.00	$1,000.00	$1,000.00
Ending Account Value (after expenses) on 7/31/23	$1,022.51	$1,018.79	$1,023.75	$1,023.75
Expenses Paid During Period*	$2.31	$6.06	$1.05	$1.05


*	Expenses are equal to the Fund’s annualized expense ratio of 0.46%, 1.21%, 0.21%, and 0.21% for Class A, Class C, Class K, and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 181/365 (to reflect the one-half year period).

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2319

Table of Contents

Schedule of Investments | 7/31/23

Principal Amount USD ($)		Value
	UNAFFILIATED ISSUERS — 97.6%
	Asset Backed Securities — 4.9% of Net Assets
100,000	Amur Equipment Finance Receivables XII LLC, Series 2023-1A, Class C, 6.36%, 12/20/29 (144A)	$ 99,719
100,000(a)	Arbor Realty Commercial Real Estate Notes, Ltd., Series 2021-FL3, Class C, 7.186% (1 Month Term SOFR + 196 bps), 8/15/34 (144A)	94,324
100,000(b)	B2R Mortgage Trust, Series 2015-2, Class E, 5.826%, 11/15/48 (144A)	96,599
96,438	BOF VII AL Funding Trust I, Series 2023-CAR3, Class A2, 6.291%, 7/26/32 (144A)	96,151
99,817	Progress Residential Trust, Series 2021-SFR7, Class A, 1.692%, 8/17/40 (144A)	82,826
100,000(a)	ReadyCap Lending Small Business Loan Trust, Series 2023-3, Class A, 8.32% (SOFR30A + 325 bps), 4/25/48 (144A)	100,000
159,191(a)	STAR Trust, Series 2021-SFR1, Class A, 5.936% (1 Month Term SOFR + 71 bps), 4/17/38 (144A)	155,719
250,000	Tesla Auto Lease Trust, Series 2021-A, Class B, 1.02%, 3/20/25 (144A)	245,971
	Total Asset Backed Securities (Cost $965,594)	$971,309


	Collateralized Mortgage Obligations—1.8% of Net Assets
42,574(a)	Connecticut Avenue Securities Trust, Series 2021-R03, Class 1M1, 5.919% (SOFR30A + 85 bps), 12/25/41 (144A)	$ 42,359
100,000(a)	Freddie Mac STACR REMIC Trust, Series 2021-DNA7, Class M2, 6.869% (SOFR30A + 180 bps), 11/25/41 (144A)	98,124
73,607(b)	Seasoned Credit Risk Transfer Trust, Series 2016-1, Class M2, 3.75%, 9/25/55 (144A)	64,307
100,801(b)	Seasoned Credit Risk Transfer Trust, Series 2019-3, Class M, 4.75%, 10/25/58	90,563
91,088(b)	Towd Point Mortgage Trust, Series 2021-R1, Class A1, 2.918%, 11/30/60 (144A)	71,205
	Total Collateralized Mortgage Obligations (Cost $367,970)	$366,558


	Commercial Mortgage-Backed Securities—5.4% of Net Assets
100,000	BX Trust, Series 2019-OC11, Class A, 3.202%, 12/9/41 (144A)	$ 86,006
476,000	Freddie Mac Multifamily Structured Pass Through Certificates, Series KG04, Class A2, 1.487%, 11/25/30	383,626

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

20Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Commercial Mortgage-Backed Securities—(continued)
500,000	Freddie Mac Multifamily Structured Pass Through Certificates, Series KG06, Class A2, 1.777%, 10/25/31	$ 403,559
250,000	SLG Office Trust, Series 2021-OVA, Class A, 2.585%, 7/15/41 (144A)	201,545
	Total Commercial Mortgage-Backed Securities (Cost $1,122,499)	$1,074,736


	Corporate Bonds — 40.6% of Net Assets
	Aerospace & Defense — 0.5%
100,000	Boeing Co., 5.805%, 5/1/50	$ 100,579
	Total Aerospace & Defense	$100,579


	Auto Manufacturers — 2.0%
150,000	Daimler Truck Finance North America LLC, 5.125%, 1/19/28 (144A)	$ 149,094
105,000	Ford Motor Co., 6.10%, 8/19/32	101,585
105,000	General Motors Co., 5.60%, 10/15/32	102,831
40,000	Hyundai Capital America, 5.80%, 6/26/25 (144A)	40,024
	Total Auto Manufacturers	$393,534


	Banks — 16.3%
300,000(b)	Bank of America Corp., 1.658% (SOFR + 91 bps), 3/11/27	$ 270,431
120,000(b)	Bank of America Corp., 2.687% (SOFR + 132 bps), 4/22/32	99,394
300,000(b)	Bank of New York Mellon Corp., 4.543% (SOFR + 117 bps), 2/1/29	292,796
150,000	Bank of Nova Scotia, 4.75%, 2/2/26	148,030
200,000(b)	Barclays Plc, 6.224% (SOFR + 298 bps), 5/9/34	201,862
200,000(b)	BNP Paribas S.A., 5.125% (1 Year CMT Index + 145 bps), 1/13/29 (144A)	196,583
100,000	Citigroup, Inc., 4.45%, 9/29/27	96,189
100,000(b)	Goldman Sachs Group, Inc., 4.223% (3 Month Term SOFR + 156 bps), 5/1/29	94,832
100,000(b)	JPMorgan Chase & Co., 5.717% (SOFR + 258 bps), 9/14/33	101,539
250,000	KeyBank N.A., 5.00%, 1/26/33	225,905
130,000(b)	Morgan Stanley, 2.484% (SOFR + 136 bps), 9/16/36	99,658
30,000(b)	Morgan Stanley, 5.948% (5 Year CMT Index + 243 bps), 1/19/38	29,844
200,000(b)	NatWest Group Plc, 5.847% (1 Year CMT Index + 135 bps), 3/2/27	198,833
200,000(b)	Societe Generale S.A., 6.446% (1 Year CMT Index + 255 bps), 1/10/29 (144A)	203,160
200,000(b)	Standard Chartered Plc, 6.17% (1 Year CMT Index + 205 bps), 1/9/27 (144A)	201,720
200,000	Sumitomo Mitsui Financial Group, Inc., 5.52%, 1/13/28	201,306

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

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2321

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	Banks — (continued)
200,000(b)	UBS Group AG, 5.711% (1 Year CMT Index + 155 bps), 1/12/27 (144A)	$ 199,680
300,000(b)	US Bancorp, 4.653% (SOFR + 123 bps), 2/1/29	287,871
100,000(b)	Wells Fargo & Co., 3.526% (SOFR + 151 bps), 3/24/28	93,481
	Total Banks	$3,243,114


	Beverages — 1.5%
300,000	Anheuser-Busch Cos. LLC/Anheuser-Busch InBev Worldwide, Inc., 4.70%, 2/1/36	$ 290,864
	Total Beverages	$290,864


	Biotechnology — 0.2%
35,000	Amgen, Inc., 5.25%, 3/2/33	$ 34,931
	Total Biotechnology	$34,931


	Chemicals — 0.3%
56,000	Albemarle Corp., 5.05%, 6/1/32	$ 53,563
	Total Chemicals	$53,563


	Computers — 1.4%
405,000	Apple, Inc., 2.65%, 2/8/51	$ 277,095
	Total Computers	$277,095


	Cosmetics/Personal Care — 0.2%
40,000	Estee Lauder Cos., Inc., 5.15%, 5/15/53	$ 40,134
	Total Cosmetics/Personal Care	$40,134


	Diversified Financial Services — 2.4%
150,000	AerCap Ireland Capital DAC/AerCap Global Aviation Trust, 2.45%, 10/29/26	$ 134,893
100,000	Air Lease Corp., 5.30%, 2/1/28	98,876
50,000	Ameriprise Financial, Inc., 5.15%, 5/15/33	49,601
150,000(b)	Capital One Financial Corp., 5.468% (SOFR + 208 bps), 2/1/29	145,976
30,000(b)	Capital One Financial Corp., 5.817% (SOFR + 260 bps), 2/1/34	29,153
30,000(b)	Charles Schwab Corp., 5.853% (SOFR + 250 bps), 5/19/34	30,915
	Total Diversified Financial Services	$489,414


	Electric — 0.5%
100,000	Eversource Energy, 5.45%, 3/1/28	$ 101,425
	Total Electric	$101,425

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

22Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Hand & Machine Tools — 0.4%
85,000	Regal Rexnord Corp., 6.30%, 2/15/30 (144A)	$ 84,861
	Total Hand & Machine Tools	$84,861


	Healthcare-Products — 0.2%
45,000	Medtronic Global Holdings SCA, 4.50%, 3/30/33	$ 43,907
	Total Healthcare-Products	$43,907


	Insurance — 1.6%
150,000	Metropolitan Life Global Funding I, 5.05%, 1/6/28 (144A)	$ 149,143
80,000	New York Life Global Funding, 4.55%, 1/28/33 (144A)	76,763
100,000	New York Life Global Funding, 4.85%, 1/9/28 (144A)	99,195
	Total Insurance	$325,101


	Internet — 1.4%
385,000	Amazon.com, Inc., 3.10%, 5/12/51	$ 281,681
	Total Internet	$281,681


	Machinery-Diversified — 0.2%
40,000	CNH Industrial Capital LLC, 4.55%, 4/10/28	$ 38,821
	Total Machinery-Diversified	$38,821


	Media — 1.4%
420,000	Comcast Corp., 2.887%, 11/1/51	$ 279,389
	Total Media	$279,389


	Oil & Gas — 0.9%
175,000	Aker BP ASA, 6.00%, 6/13/33 (144A)	$ 175,848
	Total Oil & Gas	$175,848


	Pharmaceuticals — 4.0%
240,000	AbbVie, Inc., 4.25%, 11/21/49	$ 205,892
270,000	Bristol-Myers Squibb Co., 4.25%, 10/26/49	234,545
300,000	Cigna Group, 4.375%, 10/15/28	290,127
5,000	CVS Health Corp., 5.25%, 1/30/31	5,000
55,000	CVS Health Corp., 5.25%, 2/21/33	54,716
	Total Pharmaceuticals	$790,280


	Pipelines — 0.5%
100,000	EnLink Midstream LLC, 6.50%, 9/1/30 (144A)	$ 100,653
	Total Pipelines	$100,653


	REITs — 1.2%
100,000	Simon Property Group LP , 5.50%, 3/8/33	$ 99,902

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

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2323

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Principal Amount USD ($)		Value
	REITs — (continued)
35,000	Sun Communities Operating LP , 5.70%, 1/15/33	$ 34,402
100,000	Weyerhaeuser Co., 4.75%, 5/15/26	98,610
	Total REITs	$232,914


	Retail — 2.0%
100,000	AutoZone, Inc., 4.50%, 2/1/28	$ 97,399
100,000	Lowe's Cos., Inc., 5.15%, 7/1/33	99,930
200,000	Target Corp., 4.40%, 1/15/33	193,271
15,000	Tractor Supply Co., 5.25%, 5/15/33	14,830
	Total Retail	$405,430


	Semiconductors — 0.5%
120,000	Broadcom, Inc., 3.469%, 4/15/34 (144A)	$ 98,425
	Total Semiconductors	$98,425


	Software — 0.7%
200,000	Microsoft Corp., 2.525%, 6/1/50	$ 136,237
	Total Software	$136,237


	Telecommunications — 0.3%
75,000	Verizon Communications, Inc., 3.55%, 3/22/51	$ 54,318
	Total Telecommunications	$54,318


	Total Corporate Bonds (Cost $8,185,063)	$8,072,518


	Insurance-Linked Securities — 1.2% of Net Assets#
	Event Linked Bonds — 1.2%
	Windstorm – U.S. Multistate — 1.2%
250,000(a)	Gateway Re, 15.386%, (1 Month U.S. Treasury Bill + 1,000 bps), 7/8/26 (144A)	$ 249,625
	Total Event Linked Bonds	$ 249,625


	Total Insurance-Linked Securities (Cost $250,000)	$249,625


	Foreign Government Bonds — 5.0% of Net Assets
	Israel — 1.0%
200,000	Israel Government International Bond, 4.500%, 1/17/33	$ 193,740
	Total Israel	$193,740

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

24Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

Principal Amount USD ($)		Value
	Supranational — 4.0%
850,000	European Investment Bank, 2.125%, 4/13/26	$ 796,065
	Total Supranational	$796,065


	Total Foreign Government Bonds (Cost $1,012,077)	$989,805


	U.S. Government and Agency Obligations — 38.7% of Net Assets
809,276	Federal Home Loan Mortgage Corp., 1.500%, 3/1/37	$ 696,263
248,140	Federal Home Loan Mortgage Corp., 2.500%, 8/1/51	209,564
827,677	Federal Home Loan Mortgage Corp., 2.500%, 3/1/52	697,452
787,506	Federal Home Loan Mortgage Corp., 3.000%, 4/1/42	702,796
792,163	Federal Home Loan Mortgage Corp., 3.500%, 6/1/52	718,107
719,684	Federal Home Loan Mortgage Corp., 5.000%, 2/1/53	703,346
718,244	Federal Home Loan Mortgage Corp., 5.500%, 2/1/53	715,304
876,577	Federal National Mortgage Association, 2.000%, 2/1/52	710,723
614,099	Federal National Mortgage Association, 2.500%, 7/1/37	557,267
805,868	Federal National Mortgage Association, 2.500%, 4/1/52	680,064
250,000	Federal National Mortgage Association, 3.010%, 8/1/34	213,683
500,000	Federal National Mortgage Association, 3.190%, 6/1/29	460,659
625,000	U.S. Treasury Bonds, 4.000%, 11/15/52	624,414
	Total U.S. Government and Agency Obligations (Cost $7,922,596)	$7,689,642


	TOTAL INVESTMENTS IN UNAFFILIATED ISSUERS — 97.6% (Cost $19,825,799)	$19,414,193
	OTHER ASSETS AND LIABILITIES — 2.4%	$ 476,252
	net assets — 100.0%	$ 19,890,445

bps	Basis Points.
CMT	Constant Maturity Treasury Index.
REIT	Real Estate Investment Trust.
SOFR	Secured Overnight Financing Rate.
SOFR30A	Secured Overnight Financing Rate 30 Day Average.
(144A)	The resale of such security is exempt from registration under Rule 144A of the Securities Act of 1933. Such securities may be resold normally to qualified institutional buyers. At July 31, 2023, the value of these securities amounted to $3,559,629, or 17.9% of net assets.

(a)	Floating rate note. Coupon rate, reference index and spread shown at July 31, 2023.
(b)	The interest rate is subject to change periodically. The interest rate and/or reference index and spread shown at July 31, 2023.
#	Securities are restricted as to resale.

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

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2325

Table of Contents

Schedule of Investments | 7/31/23 (continued)

Restricted Securities	Acquisition date	Cost	Value
Gateway Re	7/14/2023	$250,000	$249,625
% of Net assets			1.3%

FUTURES CONTRACTS
FIXED INCOME INDEX FUTURES CONTRACTS

Number of Contracts Long	Description	Expiration Date	Notional Amount	Market Value	Unrealized (Depreciation)
23	U.S. 2 Year Note (CBT)	9/29/23	$4,739,949	$4,669,719	$(70,230)
20	U.S. 5 Year Note (CBT)	9/29/23	2,138,058	2,136,406	(1,652)
3	U.S. Ultra Bond (CBT)	9/20/23	406,071	396,656	(9,415)
			$7,284,078	$7,202,781	$(81,297)

Number of Contracts Short	Description	Expiration Date	Notional Amount	Market Value	Unrealized Appreciation
3	U.S. 10 Year Note (CBT)	9/20/23	$ (342,704)	$ (334,219)	$ 8,485
11	U.S. 10 Year Ultra Note (CBT)	9/20/23	(1,296,926)	(1,286,828)	10,098
			$(1,639,630)	$(1,621,047)	$ 18,583
TOTAL FUTURES CONTRACTS			$ 5,644,448	$ 5,581,734	$(62,714)

Purchases and sales of securities (excluding short-term investments) for the period ended July 31, 2023 were as follows:

	Purchases	Sales
Long-Term U.S. Government Securities	$ 3,564,804	$2,982,742
Other Long-Term Securities	$22,423,897	$3,314,078

At July 31, 2023, the net unrealized depreciation on investments based on cost for federal tax purposes of $19,763,085 was as follows:

Aggregate gross unrealized appreciation for all investments in which there is an excess of value over tax cost	$ 31,100
Aggregate gross unrealized depreciation for all investments in which there is an excess of tax cost over value	(442,706)
Net unrealized depreciation	$(411,606)

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

26Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels below.

Level 1	–	unadjusted 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 risks, etc.). See Notes to Financial Statements — Note 1A.
Level 3	–	significant unobservable inputs (including the Adviser's own assumptions in determining fair value of investments). See Notes to Financial Statements — Note 1A.

The following is a summary of the inputs used as of July 31, 2023, in valuing the Fund's investments:

	Level 1	Level 2	Level 3	Total
Asset Backed Securities	$ —	$ 971,309	$—	$ 971,309
Collateralized Mortgage Obligations	—	366,558	—	366,558
Commercial Mortgage-Backed Securities	—	1,074,736	—	1,074,736
Corporate Bonds	—	8,072,518	—	8,072,518
Insurance-Linked Securities
Event Linked Bonds	—	249,625	—	249,625
Foreign Government Bonds	—	989,805	—	989,805
U.S. Government and Agency Obligations	—	7,689,642	—	7,689,642
Total Investments in Securities	$ —	$19,414,193	$ —	$19,414,193
Other Financial Instruments
Net unrealized depreciation on futures contracts	$(62,714)	$ —	$—	$ (62,714)
Total Other Financial Instruments	$ (62,714)	$ —	$ —	$ (62,714)

During the period ended July 31, 2023, there were no transfers in or out of Level 3.

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

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2327

Table of Contents

Statement of Assets and Liabilities | 7/31/23

ASSETS:
Investments in unaffiliated issuers, at value (cost $19,825,799)	$19,414,193
Cash	31,719
Futures collateral	135,246
Variation margin for futures contracts	2,313
Receivables —
Investment securities sold	200,780
Interest	143,487
Due from the Adviser	4,487
Other assets	63,268
Total assets	$19,995,493
LIABILITIES:
Payables —
Investment securities purchased	$ 2,313
Distributions	10,214
Trustees' fees	671
Professional fees	78,527
Printing expense	9,297
Management fees	948
Administrative expenses	561
Distribution fees	169
Accrued expenses	2,348
Total liabilities	$ 105,048
NET ASSETS:
Paid-in capital	$20,386,754
Distributable earnings	(496,309)
Net assets	$ 19,890,445
NET ASSET VALUE PER SHARE:
No par value (unlimited number of shares authorized)
Class A (based on $993,619/101,861 shares)	$ 9.75
Class C (based on $989,528/101,483 shares)	$ 9.75
Class K (based on $994,850/101,989 shares)	$ 9.75
Class Y (based on $16,912,448/1,733,818 shares)	$ 9.75
MAXIMUM OFFERING PRICE PER SHARE:
Class A (based on $9.75 net asset value per share/100%-4.50% maximum sales charge)	$ 10.21

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

28Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

Statement of Operations FOR THE PERIOD FROM 12/15/22* TO 7/31/23

INVESTMENT INCOME:
Interest from unaffiliated issuers	$ 546,006
Dividends from unaffiliated issuers	53,042
Total Investment Income		$ 599,048
EXPENSES:
Management fees	$ 43,527
Administrative expenses	5,034
Transfer agent fees
Class A	8
Class C	5
Class K	8
Class Y	5
Distribution fees
Class A	1,582
Class C	6,199
Shareowner communications expense	23
Custodian fees	289
Registration fees	57,212
Professional fees	136,469
Printing expense	35,076
Officers' and Trustees' fees	4,723
Miscellaneous	5,100
Total expenses		$ 295,260
Less fees waived and expenses reimbursed by the Adviser		(261,822)
Net expenses		$ 33,438
Net investment income		$ 565,610
REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS:
Net realized gain (loss) on:
Investments in unaffiliated issuers	$ 27,676
Futures contracts	(161,566)	$ (133,890)
Change in net unrealized appreciation (depreciation) on:
Investments in unaffiliated issuers	$(411,606)
Futures contracts	(62,714)	$ (474,320)
Net realized and unrealized gain (loss) on investments		$(608,210)
Net increase in net assets resulting from operations		$ (42,600)

* The Fund commenced operations on December 15, 2022.

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

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2329

Table of Contents

Statements of Changes in Net Assets

	Period From 12/15/22* to 7/31/23
FROM OPERATIONS:
Net investment income (loss)	$ 565,610
Net realized gain (loss) on investments	(133,890)
Change in net unrealized appreciation (depreciation) on investments	(474,320)
Net increase in net assets resulting from operations	$ (42,600)
DISTRIBUTIONS TO SHAREOWNERS:
Class A ($0.21 and $— per share, respectively)	$ (22,065)
Class C ($0.17 and $— per share, respectively)	(17,208)
Class K ($0.23 and $— per share, respectively)	(23,093)
Class Y ($0.23 and $— per share, respectively)	(392,579)
Total distributions to shareowners	$ (454,945)
FROM FUND SHARE TRANSACTIONS:
Net proceeds from sales of shares	$20,075,696
Reinvestment of distributions	386,710
Cost of shares repurchased	(74,416)
Net increase in net assets resulting from Fund share transactions	$20,387,990
Net increase in net assets	$ 19,890,445
NET ASSETS:
Beginning of period	$ —
End of period	$ 19,890,445

*	The Fund commenced operations on December 15, 2022.

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

30Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

	Period From 12/15/22* to 7/31/23 Shares	Period From 12/15/22* to 7/31/23 Amount
Class A
Shares sold	107,585	$ 1,075,696
Reinvestment of distributions	1,901	18,753
Less shares repurchased	(7,625)	(74,416)
Net increase	101,861	$ 1,020,033
Class C
Shares sold	100,000	$ 1,000,000
Reinvestment of distributions	1,483	14,627
Less shares repurchased	—	—
Net increase	101,483	$ 1,014,627
Class K
Shares sold	100,000	$ 1,000,000
Reinvestment of distributions	1,989	19,630
Less shares repurchased	—	—
Net increase	101,989	$ 1,019,630
Class Y
Shares sold	1,700,000	$17,000,000
Reinvestment of distributions	33,818	333,700
Less shares repurchased	—	—
Net increase	1,733,818	$17,333,700

The Fund commenced operations on December 15, 2022.

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

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2331

Table of Contents

Financial Highlights

	12/15/22* to 7/31/23
Class A
Net asset value, beginning of period	$10.00
Increase (decrease) from investment operations:
Net investment income (loss) (a)	$ 0.27
Net realized and unrealized gain (loss) on investments	(0.31)
Net increase (decrease) from investment operations	$ (0.04)
Distributions to shareowners:
Net investment income	$ (0.21)
Total distributions	$ (0.21)
Net increase (decrease) in net asset value	$ (0.25)
Net asset value, end of period	$ 9.75
Total return (b)	(0.36)%(c)
Ratio of net expenses to average net assets	0.46%(d)
Ratio of net investment income (loss) to average net assets	4.36%(d)
Portfolio turnover rate	34%(c)
Net assets, end of period (in thousands)	$ 994
Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly:
Total expenses to average net assets	2.56%(d)
Net investment income (loss) to average net assets	2.26%(d)

*	Class A commenced operations on December 15, 2022.
(a)	The per-share data presented above is based on the average shares outstanding for the period presented.
(b)	Assumes initial investment at net asset value at the beginning of the period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of the period and no sales charges. Total return would be reduced if sales charges were taken into account.
(c)	Not annualized.
(d)	Annualized.

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

32Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

	12/15/22* to 7/31/23
Class C
Net asset value, beginning of period	$10.00
Increase (decrease) from investment operations:
Net investment income (loss) (a)	$ 0.22
Net realized and unrealized gain (loss) on investments	(0.30)
Net increase (decrease) from investment operations	$ (0.08)
Distributions to shareowners:
Net investment income	$ (0.17)
Total distributions	$ (0.17)
Net increase (decrease) in net asset value	$ (0.25)
Net asset value, end of period	$ 9.75
Total return (b)	(0.80)%(c)
Ratio of net expenses to average net assets	1.21%(d)
Ratio of net investment income (loss) to average net assets	3.61%(d)
Portfolio turnover rate	34%(c)
Net assets, end of period (in thousands)	$ 990
Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly:
Total expenses to average net assets	3.31%(d)
Net investment income (loss) to average net assets	1.51%(d)

*	Class C commenced operations on December 15, 2022.
(a)	The per-share data presented above is based on the average shares outstanding for the period presented.
(b)	Assumes initial investment at net asset value at the beginning of the period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of the period and no sales charges. Total return would be reduced if sales charges were taken into account.
(c)	Not annualized.
(d)	Annualized.

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

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2333

Table of Contents

Financial Highlights (continued)

	12/15/22* to 7/31/23
Class K
Net asset value, beginning of period	$10.00
Increase (decrease) from investment operations:
Net investment income (loss) (a)	$ 0.28
Net realized and unrealized gain (loss) on investments	(0.30)
Net increase (decrease) from investment operations	$ (0.02)
Distributions to shareowners:
Net investment income	$ (0.23)
Total distributions	$ (0.23)
Net increase (decrease) in net asset value	$ (0.25)
Net asset value, end of period	$ 9.75
Total return (b)	(0.21)%(c)
Ratio of net expenses to average net assets	0.21%(d)
Ratio of net investment income (loss) to average net assets	4.61%(d)
Portfolio turnover rate	34%(c)
Net assets, end of period (in thousands)	$ 995
Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly:
Total expenses to average net assets	2.31%(d)
Net investment income (loss) to average net assets	2.51%(d)

*	Class K commenced operations on December 15, 2022.
(a)	The per-share data presented above is based on the average shares outstanding for the period presented.
(b)	Assumes initial investment at net asset value at the beginning of the period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of the period.
(c)	Not annualized.
(d)	Annualized.

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

34Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

	12/15/22* to 7/31/23
Class Y
Net asset value, beginning of period	$ 10.00
Increase (decrease) from investment operations:
Net investment income (loss) (a)	$ 0.28
Net realized and unrealized gain (loss) on investments	(0.30)
Net increase (decrease) from investment operations	$ (0.02)
Distributions to shareowners:
Net investment income	$ (0.23)
Total distributions	$ (0.23)
Net increase (decrease) in net asset value	$ (0.25)
Net asset value, end of period	$ 9.75
Total return (b)	(0.21)%(c)
Ratio of net expenses to average net assets	0.21%(d)
Ratio of net investment income (loss) to average net assets	4.61%(d)
Portfolio turnover rate	34%(c)
Net assets, end of period (in thousands)	$16,912
Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly:
Total expenses to average net assets	2.31%(d)
Net investment income (loss) to average net assets	2.51%(d)

*	Class Y commenced operations on December 15, 2022.
(a)	The per-share data presented above is based on the average shares outstanding for the period presented.
(b)	Assumes initial investment at net asset value at the beginning of the period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of the period.
(c)	Not annualized.
(d)	Annualized.

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

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2335

Table of Contents

Notes to Financial Statements | 7/31/23

1. Organization and Signiﬁcant Accounting Policies

Amundi Climate Transition Core Bond Fund (the “Fund”) is one of four portfolios comprising Pioneer Series Trust IV (the "Trust"), a Delaware statutory trust. The Fund is registered under the Investment Company Act of 1940, as amended (the “1940 Act”) as a diversified, open-end management investment company. The Fund’s investment objective is to seek a combination of income and capital appreciation.

The Fund offers four classes of shares designated as Class A, Class C, Class K and Class Y shares. Class A, Class C, Class K and Class Y commenced operations on December 15, 2022. 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 Trust gives the Board of Trustees the ﬂexibility to specify either per-share voting or dollar-weighted voting when submitting matters for shareowner approval. Under per-share voting, each share of a class of the Fund is entitled to one vote. Under dollar-weighted voting, a shareowner’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 or Class Y shares.

36Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

The Fund is required to comply with Rule 18f-4 under the 1940 Act, which governs the use of derivatives by registered investment companies. Rule 18f-4 permits funds to enter into derivatives transactions (as defined in Rule 18f-4) and certain other transactions notwithstanding the restrictions on the issuance of “senior securities” under Section 18 of the 1940 Act. Rule 18f-4 requires a fund to establish and maintain a comprehensive derivatives risk management program, appoint a derivatives risk manager and comply with a relative or absolute limit on fund leverage risk calculated based on value-at-risk (“VaR”), unless the fund uses derivatives in only a limited manner (a "limited derivatives user"). The Fund is currently a limited derivatives user for purposes of Rule 18f-4.

The following is a summary of signiﬁcant accounting policies followed by the Fund in the preparation of its ﬁnancial statements:

A.	Security Valuation
	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.
	Fixed-income securities are valued by using 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, or may use a pricing matrix or other fair value methods or techniques to provide an estimated value of the security or instrument. A pricing matrix is a means of valuing a debt security on the basis of current market prices for other debt securities, historical trading patterns in the market for fixed-income securities and/or other factors. Non-U.S. debt securities that are listed on an exchange will be valued at the bid price obtained from an independent

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2337

Table of Contents

	third party pricing service. When independent third party pricing services are unable to supply prices, or when prices or market quotations are considered to be unreliable, the value of that security may be determined using quotations from one or more broker-dealers.
	Loan interests are valued 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 third party 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.
	Equity securities that have traded on an exchange are valued by using 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 or, if both last bid and asked prices are not available, at the last quoted bid price. Last sale and bid and asked prices are provided by independent third party pricing services. In the case of equity securities not traded on an exchange, prices are typically determined by independent third party pricing services using a variety of techniques and methods.
	The value of foreign securities is translated into U.S. dollars based on foreign currency exchange rate quotations supplied by a third party pricing source. Trading in non-U.S. equity securities is substantially completed each day at various times prior to the close of the NYSE. The values of such securities used in computing the net asset value of the Fund's shares are determined as of such times. The Adviser may use a fair value model developed by an independent pricing service to value non-U.S. equity securities.
	Futures contracts are generally valued at the closing settlement price established by the exchange on which they are traded.
	Securities or loan interests for which independent pricing services or broker-dealers 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 the Adviser. The Adviser is designated as the valuation designee for the Fund pursuant to Rule 2a-5 under the 1940 Act. The Adviser’s fair valuation team is responsible for monitoring developments that may impact fair valued securities.

38Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

	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 Adviser 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.
B.	Investment Income and Transactions
	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 and net of income accrued on defaulted securities.
	Interest and dividend income payable by delivery of additional shares is reclassified as PIK (payment-in-kind) income upon receipt and is included in interest and dividend income, respectively.
	Principal amounts of mortgage-backed securities 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 purchase prices of 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.
	Security transactions are recorded as of trade date. Gains and losses on sales of investments are calculated on the identified cost method for both financial reporting and federal income tax purposes.
C.	Foreign Currency Translation
	The books and records of the Fund are maintained in U.S. dollars. Amounts denominated in foreign currencies are translated into U.S. dollars using current exchange rates.

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2339

Table of Contents

	Net realized gains and losses on foreign currency transactions, if any, represent, among other things, the net realized gains and losses on foreign currency exchange contracts, disposition of foreign currencies and the difference between the amount of income accrued and the U.S. dollars actually received. Further, the effects of changes in foreign currency exchange rates on investments are not segregated on the Statement of Operations from the effects of changes in the market prices of those securities, but are included with the net realized and unrealized gain or loss on investments.
D.	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 net taxable income and net realized capital gains, if any, to its shareowners. Therefore, no provision for federal income taxes is required. As of July 31, 2023, 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 on the Statement of Operations. Tax returns filed within the prior three years remain subject to examination by federal and state tax authorities.
	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. GAAP. Distributions in excess of net investment income or net realized gains are temporary over distributions 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.
	At July 31, 2023, the Fund reclassified $1,236 to increase distributable earnings and $1,236 to decrease paid-in capital to reflect permanent book/tax differences. These adjustments have no impact on net assets or the results of operations.
	At July 31, 2023, the Fund was permitted to carry forward indefinitely $41,971 of short-term losses and $134,568 of long-term losses.

40Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

The tax character of distributions paid during the period ended July 31, 2023 was as follows:

	2023
Distributions paid from:
Ordinary income	$454,945
Total	$454,945

The following shows the components of distributable earnings (losses) on a federal income tax basis at July 31, 2023:

	2023
Distributable earnings/(losses):
Undistributed ordinary income	$ 102,050
Capital loss carryforward	(176,539)
Other book/tax temporary differences	(10,214)
Net unrealized depreciation	(411,606)
Total	$(496,309)

The difference between book-basis and tax-basis net unrealized depreciation is attributable to the mark to market of futures contracts.

E.	Fund Shares
	The Fund records sales and repurchases of its shares as of trade date. The Distributor earned $0 in underwriting commissions on the sale of Class A shares during the period ended July 31, 2023.
F.	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 and Class C shares of the Fund, respectively (see Note 5). Class K and Class Y shares do not pay distribution fees. All expenses and fees paid to the Fund's transfer agent 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 4).
	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

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2341

Table of Contents

	of shares are calculated in the same manner and at the same time, except that net investment income dividends to Class A, Class C, Class K and Class Y shares can reflect different transfer agent and distribution expense rates.
G.	Risks
	The value of securities held by the Fund may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic, political or regulatory conditions, recessions, the spread of infectious illness or other public health issues, inflation, changes in interest rates, armed conflict including Russia's military invasion of Ukraine, sanctions against Russia, other nations or individuals or companies and possible countermeasures, lack of liquidity in the bond markets or adverse investor sentiment. In the past several years, financial markets have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. These conditions may continue, recur, worsen or spread. Inflation and interest rates have increased and may rise further. These circumstances could adversely affect the value and liquidity of the Fund's investments and negatively impact the Fund's performance.
	The long-term impact of the COVID-19 pandemic and its subsequent variants on economies, markets, industries and individual issuers, are not known. Some sectors of the economy and individual issuers have experienced or may experience particularly large losses. Periods of extreme volatility in the financial markets, reduced liquidity of many instruments, increased government debt, inflation, and disruptions to supply chains, consumer demand and employee availability, may continue for some time. Following Russia's invasion of Ukraine, Russian securities lost all, or nearly all, their market value. Other securities or markets could be similarly affected by past or future political, geopolitical or other events or conditions.
	Governments and central banks, including the U.S. Federal Reserve, have taken extraordinary and unprecedented actions to support local and global economies and the financial markets. These actions have resulted in significant expansion of public debt, including in the U.S. The consequences of high public debt, including its future impact on the economy and securities markets, may not be known for some time.
	The U.S. and other countries are periodically involved in disputes over trade and other matters, which may result in tariffs, investment restrictions and adverse impacts on affected companies and securities. For example, the U.S. has imposed tariffs and other trade barriers on Chinese exports, has restricted sales of certain categories of goods to

42Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

	China, and has established barriers to investments in China. Trade disputes may adversely affect the economies of the U.S. and its trading partners, as well as companies directly or indirectly affected and financial markets generally. If the political climate between the U.S. and China does not improve or continues to deteriorate, if China were to attempt unification of Taiwan by force, or if other geopolitical conflicts develop or get worse, economies, markets and individual securities may be severely affected both regionally and globally, and the value of the Fund's assets may go down.
	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 market prices of the Fund's fixed income securities may fluctuate significantly when interest rates change. The value of your investment will generally go down when interest rates rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. For example, if interest rates increase by 1%, the value of a Fund's portfolio with a portfolio duration of ten years would be expected to decrease by 10%, all other things being equal. In recent years interest rates and credit spreads in the U.S. have been at historic lows. The U.S. Federal Reserve has raised certain interest rates, and interest rates may continue to go up. A general rise in interest rates could adversely affect the price and liquidity of fixed income securities. The maturity of a security may be significantly longer than its effective duration. A security's maturity and other features may be more relevant than its effective duration in determining the security's sensitivity to other factors affecting the issuer or markets generally, such as changes in credit quality or in the yield premium that the market may establish for certain types of securities (sometimes called "credit spread"). In general, the longer its maturity the more a security may be susceptible to these factors. When the credit spread for a fixed income security goes up, or "widens," the value of the security will generally go down.
	If an issuer or guarantor of a security held by the Fund or a counterparty to a financial contract with the Fund defaults on its obligation to pay principal and/or interest, has its credit rating downgraded or is perceived to be less creditworthy, or the credit quality or value of any underlying assets declines, the value of your investment will typically decline. Changes in actual or perceived creditworthiness may occur quickly. The Fund could be delayed or hindered in its enforcement of rights against an issuer, guarantor or counterparty.

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2343

Table of Contents

	Russia launched a large-scale invasion of Ukraine on February 24, 2022. In response to the military action by Russia, various countries, including the U.S., the United Kingdom, and European Union issued broad-ranging economic sanctions against Russia and Belarus and certain companies and individuals. Since then, Russian securities have lost all, or nearly all, their market value, and many other issuers, securities and markets have been adversely affected. The United States and other countries may impose sanctions on other countries, companies and individuals in light of Russia’s military invasion. The extent and duration of the military action or future escalation of such hostilities, the extent and impact of existing and future sanctions, market disruptions and volatility, and the result of any diplomatic negotiations cannot be predicted. These and any related events could have a significant impact on the value and liquidity of certain Fund investments, on Fund performance and the value of an investment in the Fund, particularly with respect to securities and commodities, such as oil, natural gas and food commodities, as well as other sectors with exposure to Russian issuers or issuers in other countries affected by the invasion, and are likely to have collateral impacts on market sectors globally.
	Under normal circumstances, the Fund invests at least 80% of its net assets in fixed income investments that meet Amundi US's climate transition criteria (the “Climate Transition Criteria”). Amundi US’s consideration of the Climate Transition Criteria in making investment decisions will result in the exclusion of investments the issuers of which do not meet the Climate Transition Criteria. To the extent other ESG information is considered in making investment decisions, such other ESG information also may result in the exclusion of investments. Excluding specific issuers limits the universe of investments available to the Fund as compared with other funds that do not consider the Climate Transition Criteria or ESG information, which may mean forgoing some investment opportunities available to funds that do not consider these criteria or information or having a portfolio with fewer holdings and/or less issuer diversification. Accordingly, the Fund may underperform other funds that do not utilize an investment strategy that considers the Climate Transition Criteria or ESG information. Amundi US may use third party climate information (such as pertaining to carbon-related issuer characteristics or whether an issuer has a viable sustainability plan) or ESG ratings information that it believes to be reliable, but such information may not be accurate or complete, or may be biased.
	Amundi US's focus on the carbon and climate-related characteristics of issuers may increase the Fund’s exposure to certain investments. The Fund is more susceptible to events or factors adversely affecting such

44Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

	investments, such as a decrease in governmental or other support for climate-related or environmental initiatives or an increase in the cost of implementing climate-related initiatives. The Fund’s relative performance also may be affected, depending on whether such investments are in or out of favor with the market. Under certain market conditions, the Fund may underperform funds that invest in a broader array of investments.
	The Fund invests in below-investment-grade (high-yield) debt securities and preferred stocks. Some of these high-yield securities may be convertible into equity securities of the issuer. Debt securities rated below-investment-grade are commonly referred to as “junk bonds” and are considered speculative with respect to the issuer’s capacity to pay interest and repay principal. These securities involve greater risk of loss, are subject to greater price volatility, and may be less liquid and more difficult to value, especially during periods of economic uncertainty or change, than higher rated debt securities.
	The Fund's investments, payment obligations and financing terms may be based on floating rates, such as LIBOR (London Interbank Offered Rate) or SOFR (Secured Overnight Financing Rate). ICE Benchmark Administration, the administrator of LIBOR, has ceased publication of most LIBOR settings on a representative basis. Actions by regulators have resulted in the establishment of alternative reference rates to LIBOR in most major currencies. In the U.S., a common benchmark replacement is based on the SOFR published by the Federal Reserve Bank of New York, including certain spread adjustments and benchmark replacement conforming changes, although other benchmark replacements (without or without spread adjustments) may be used in certain transactions. The impact of the transition from LIBOR on the Fund's transactions and financial markets generally cannot yet be determined. The transition away from LIBOR may lead to increased volatility and illiquidity in markets for instruments that have relied on LIBOR and may adversely affect the Fund's performance.
	With the increased use of technologies such as the Internet to conduct business, the Fund is susceptible to operational, information security and related risks. While the Fund’s Adviser has established business continuity plans in the event of, and risk management systems to prevent, limit or mitigate, such cyber-attacks, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund such as the Fund’s custodian and accounting agent, and the Fund’s transfer agent. In addition, many

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2345

Table of Contents

	beneficial owners of Fund shares hold them through accounts at broker-dealers, retirement platforms and other financial market participants over which neither the Fund nor the Adviser exercises control. Each of these may in turn rely on service providers to them, which are also subject to the risk of cyber-attacks. Cybersecurity failures or breaches at the Adviser or the Fund’s service providers or intermediaries have the ability to cause disruptions and impact business operations, potentially resulting in financial losses, interference with the Fund’s ability to calculate its net asset value, impediments to trading, the inability of Fund shareowners to effect share purchases, redemptions or exchanges or receive distributions, loss of or unauthorized access to private shareowner information and violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, or additional compliance costs. Such costs and losses may not be covered under any insurance. In addition, maintaining vigilance against cyber-attacks may involve substantial costs over time, and system enhancements may themselves be subject to cyber-attacks.
	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.
H.	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.
	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. Cash received from or paid to the broker related to previous margin movement is held in a segregated account at the broker and is recorded as either "Due from broker for futures" or "Due to broker for futures" on the Statement of Assets and Liabilities. 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. 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. With futures, there is reduced counterparty credit risk to the Fund since

46Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

	futures are exchange-traded and the exchange's clearinghouse, as counterparty to all exchange-traded futures, guarantees the futures against default.
	The average notional values of futures contracts long position and futures contracts short position during the period ended July 31, 2023 were $3,501,778 and $1,302,527, respectively. Open futures contracts outstanding at July 31, 2023 are listed in the Schedule of Investments.

2. Management Agreement

The Adviser manages the Fund’s portfolio. Management fees payable under the Fund's Investment Management Agreement with the Adviser are calculated daily and paid monthly at the annual rate of 0.35% of the Fund’s average daily net assets up to $1 billion, 0.30% of the next $5 billion of the Fund’s average daily net assets and 0.25% of the Fund’s average daily net assets over $6 billion. For the period ended July 31, 2023, the effective management fee (excluding waivers and/or assumption of expenses) was equivalent to 0.35% (annualized) of the Fund’s average daily net assets.

The 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 0.73%, 1.48%, 0.45% and 0.45%, of the average daily net assets attributable to Class A, Class C, Class K and Class Y shares, respectively. These expense limitations will be in effect through December 1, 2025. There can be no assurance that the Adviser will extend the expense limitation agreement for a class of shares beyond the date referred to above. Fees waived and expenses reimbursed during the period ended July 31, 2023 are reflected on the Statement of Operations.

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. Reflected on the Statement of Assets and Liabilities is $948 in management fees payable to the Adviser at July 31, 2023.

3. Compensation of Officers and Trustees

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2347

Table of Contents

compensation. For the period ended July 31, 2023, the Fund paid $4,723 in Officers' and Trustees' compensation, which is reflected on the Statement of Operations as Officers' and Trustees' fees. At July 31, 2023, on its Statement of Assets and Liabilities, the Fund had a payable for Trustees' fees of $671 and a payable for administrative expenses of $561, which includes the payable for Officers' compensation.

4. Transfer Agent

Shareowner Communications:
Class A	$ 8
Class C	5
Class K	5
Class Y	5
Total	$23

5. Distribution Plan

The Fund has adopted a distribution plan (the “Plan”) pursuant to Rule 12b-1 under the 1940 Act with respect to its Class A and Class C shares. Pursuant to the Plan, the Fund pays the Distributor 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 the Distributor 1.00% of the average daily net assets attributable to Class C shares. The fee for 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 C shares. Reflected on the Statement of Assets and Liabilities is $169 in distribution fees payable to the Distributor at July 31, 2023.

In addition, redemptions of Class A and Class C 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. Redemptions of Class C shares within 12 months of purchase are subject to a CDSC of 1.00%, based on the lower of 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 K or Class Y shares. Proceeds from the CDSCs are paid to the Distributor. For the period ended July 31, 2023, CDSCs in the amount of $0 were paid to the Distributor.

48Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

6. Additional Disclosures about Derivative Instruments and Hedging Activities

The Fund’s use of derivatives may enhance or mitigate the Fund’s exposure to the following risks:

Interest rate risk relates to the ﬂuctuations in the value of interest-bearing securities due to changes in the prevailing levels of market interest rates.

Credit risk relates to the ability of the issuer of a ﬁnancial instrument to make further principal or interest payments on an obligation or commitment that it has to the Fund.

Foreign exchange rate risk relates to ﬂuctuations in the value of an asset or liability due to changes in currency exchange rates.

The fair value of open derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) by risk exposure at July 31, 2023, was as follows:

Statement of Assets and Liabilities	Interest Rate Risk	Credit Risk	Foreign Exchange Rate Risk	Equity Risk	Commodity Risk
Assets
Net unrealized appreciation on futures contracts*	$18,583	$ —	$ —	$ —	$ —
Total Value	$18,583	$—	$—	$—	$—
Liabilities
Net unrealized depreciation on futures contracts*	$81,297	$ —	$ —	$ —	$ —
Total Value	$81,297	$—	$—	$—	$—


*	Includes cumulative unrealized appreciation (depreciation) of futures contracts as reported in the Schedule of Investments. Only net variation margin is reported within the assets and/or liabilities on the Statement of Assets and Liabilities.

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2349

Table of Contents

The effect of derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) on the Statement of Operations by risk exposure at July 31, 2023 was as follows:

Statement of Operations	Interest Rate Risk	Credit Risk	Foreign Exchange Rate Risk	Equity Risk	Commodity Risk
Net Realized Gain (Loss) on
Futures contracts	$ (161,566)	$ —	$ —	$ —	$ —
Total Value	$(161,566)	$—	$—	$—	$—
Change in Net Unrealized Appreciation (Depreciation) on
Futures contracts	$ (62,714)	$ —	$ —	$ —	$ —
Total Value	$ (62,714)	$—	$—	$—	$—

50Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

Report of Independent Registered Public Accounting Firm

To the Board of Trustees of Pioneer Series Trust IV and the Shareholders of Amundi Climate Transition Core Bond Fund:

Opinion on the Financial Statements

We have audited the accompanying statement of assets and liabilities of Amundi Climate Transition Core Bond Fund (the “Fund”) (one of the funds constituting Pioneer Series Trust IV (the “Trust”)), including the schedule of investments, as of July 31, 2023, and the related statements of operations, changes in net assets and the financial highlights for the period from December 15, 2022 (commencement of operations) through July 31, 2023 and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Fund (one of the funds constituting Pioneer Series Trust IV) at July 31, 2023, the results of its operations, the changes in its net assets, and its financial highlights for the period from December 15, 2022 (commencement of operations) through July 31, 2023, in conformity with U.S. generally accepted accounting principles.

Basis for Opinion

These financial statements are the responsibility of the Trust’s management. Our responsibility is to express an opinion on the Fund’s financial statements based on our audit. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) ("PCAOB") and are required to be independent with respect to the Trust in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Trust is not required to have, nor were we engaged to perform, an audit of the Trust’s internal control over financial reporting. As part of our audit, we are required to obtain an understanding of internal control over financial reporting, but not for the purpose of expressing an opinion on the effectiveness of the Trust’s internal control over financial reporting. Accordingly, we express no such opinion.

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2351

Table of Contents

Our audit included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our procedures included confirmation of securities owned as of July 31, 2023, by correspondence with the custodian, brokers and others; when replies were not received from brokers and others, we performed other auditing procedures. Our audit also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audit provides a reasonable basis for our opinion.

We have served as the auditor of one or more investment companies in the Pioneer family of funds since 2017.

Boston, Massachusetts
September 29, 2023

52Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

Additional Information (unaudited)

Qualified interest income is exempt from nonresident alien (NRA) tax withholding. The percentage of the Fund’s ordinary income distributions derived from qualified interest income was 78.38%.

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2353

Table of Contents

Statement Regarding Liquidity Risk Management Program

The Committee provided the Board of Trustees with a report that addressed the operation of the Program and assessed its adequacy and effectiveness of implementation (the “Report”). The Report covered the period from December 15, 2022 (commencement of operations) through December 31, 2022 (the “Reporting Period”).

The Report discussed the Committee’s annual review of the Program, which addressed, among other things, the following elements of the Program:

54Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

holdings of cash and cash equivalents, as well as borrowing arrangements and other funding sources, including, if applicable, the Fund’s participation in a credit facility, as components of the Fund’s ability to meet redemption requests. The Fund has adopted an in-kind redemption policy which may be utilized to meet larger redemption requests.

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23 55

Table of Contents

Trustees, Officers and Service Providers

Investment Adviser and Administrator
Amundi Asset Management US, Inc.

Custodian and Sub-Administrator
The Bank of New York Mellon Corporation

Independent Registered Public Accounting Firm
Ernst & Young LLP

Principal Underwriter
Amundi Distributor US, Inc.

Legal Counsel
Morgan, Lewis & Bockius LLP

Transfer Agent
BNY Mellon Investment Servicing (US) Inc.

Trustees and Officers

The Statement of Additional Information of the Fund includes additional information about the Directors and is available, without charge, upon request, by calling 1-800-225-6292.

56Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

Independent Trustees

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Thomas J. Perna (72) Chairman of the Board and Trustee	Trustee since 2022. Serves until a successor trustee is elected or earlier retirement or removal.	Private investor (2004 – 2008 and 2013 – present); Chairman (2008 – 2013) and Chief Executive Officer (2008 – 2012), Quadriserv, Inc. (technology products for securities lending industry); and Senior Executive Vice President, The Bank of New York (financial and securities services) (1986 – 2004)	Director, Broadridge Financial Solutions, Inc. (investor communications and securities processing provider for financial services industry) (2009 – present); Director, Quadriserv, Inc. (2005 – 2013); and Commissioner, New Jersey State Civil Service Commission (2011 – 2015)
John E. Baumgardner, Jr. (72)* Trustee	Trustee since 2022. Serves until a successor trustee is elected or earlier retirement or removal.	Of Counsel (2019 – present), Partner (1983-2018), Sullivan & Cromwell LLP (law firm).	Chairman, The Lakeville Journal Company, LLC, (privately-held community newspaper group) (2015-present)
Diane Durnin (66) Trustee	Trustee since 2022. Serves until a successor trustee is elected or earlier retirement or removal.	Managing Director - Head of Product Strategy and Development, BNY Mellon Investment Management (investment management firm) (2012-2018); Vice Chairman – The Dreyfus Corporation (2005 – 2018): Executive Vice President Head of Product, BNY Mellon Investment Management (2007-2012); Executive Director- Product Strategy, Mellon Asset Management (2005-2007); Executive Vice President Head of Products, Marketing and Client Service, Dreyfus Corporation (investment management firm) (2000-2005); Senior Vice President Strategic Product and Business Development, Dreyfus Corporation (1994-2000)	None
* Mr. Baumgardner is Of Counsel to Sullivan & Cromwell LLP, which acts as counsel to the Independent Trustees of each Pioneer Fund.

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2357

Table of Contents

Independent Trustees (continued)

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Benjamin M. Friedman (78) Trustee	Trustee since 2022. Serves until a successor trustee is elected or earlier retirement or removal.	William Joseph Maier Professor of Political Economy, Harvard University (1972 – present)	Trustee, Mellon Institutional Funds Investment Trust and Mellon Institutional Funds Master Portfolio (oversaw 17 portfolios in fund complex) (1989 - 2008)
Craig C. MacKay (60) Trustee	Trustee since 2022. Serves until a successor trustee is elected or earlier retirement or removal.	Partner, England & Company, LLC (advisory firm) (2012 – present); Group Head – Leveraged Finance Distribution, Oppenheimer & Company (investment bank) (2006 – 2012); Group Head – Private Finance & High Yield Capital Markets Origination, SunTrust Robinson Humphrey (investment bank) (2003 – 2006); and Founder and Chief Executive Officer, HNY Associates, LLC (investment bank) (1996 – 2003)	Director, Equitable Holdings, Inc. (financial services holding company) (2022 – present); Board Member of Carver Bancorp, Inc. (holding company) and Carver Federal Savings Bank, NA (2017 – present); Advisory Council Member, MasterShares ETF (2016 – 2017); Advisory Council Member, The Deal (financial market information publisher) (2015 – 2016); Board Co-Chairman and Chief Executive Officer, Danis Transportation Company (privately-owned commercial carrier) (2000 – 2003); Board Member and Chief Financial Officer, Customer Access Resources (privately-owned teleservices company) (1998 – 2000); Board Member, Federation of Protestant Welfare Agencies (human services agency) (1993 – present); and Board Treasurer, Harlem Dowling Westside Center (foster care agency) (1999 – 2018)

58Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Lorraine H. Monchak (67) Trustee	Trustee since 2022. (Advisory Trustee from 2014 - 2017). Serves until a successor trustee is elected or earlier retirement or removal.	Chief Investment Officer, 1199 SEIU Funds (healthcare workers union pension funds) (2001 – present); Vice President – International Investments Group, American International Group, Inc. (insurance company) (1993 – 2001); Vice President Corporate Finance and Treasury Group, Citibank, N.A. (1980 – 1986 and 1990 – 1993); Vice President – Asset/Liability Management Group, Federal Farm Funding Corporation (government-sponsored issuer of debt securities) (1988 – 1990); Mortgage Strategies Group, Shearson Lehman Hutton, Inc. (investment bank) (1987 – 1988); Mortgage Strategies Group, Drexel Burnham Lambert, Ltd. (investment bank) (1986 – 1987)	None
Marguerite A. Piret (75) Trustee	Trustee since 2022. Serves until a successor trustee is elected or earlier retirement or removal.	Chief Financial Officer, American Ag Energy, Inc. (technology for the environment, energy and agriculture) (2019 – present); Chief Operating Officer, North Country Growers LLC (controlled environment agriculture company) (2020 – present); Chief Executive Officer, Green Heat LLC (biofuels company) (2022 – present); President and Chief Executive Officer, Newbury Piret Company (investment banking firm) (1981 – 2019)	Director of New America High Income Fund, Inc. (closed-end investment company) (2004 – present); and Member, Board of Governors, Investment Company Institute (2000 – 2006)

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2359

Table of Contents

Independent Trustees (continued)

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Fred J. Ricciardi (76) Trustee	Trustee since 2022. Serves until a successor trustee is elected or earlier retirement or removal.	Private investor (2020 – present); Consultant (investment company services) (2012 – 2020); Executive Vice President, BNY Mellon (financial and investment company services) (1969 – 2012); Director, BNY International Financing Corp. (financial services) (2002 – 2012); Director, Mellon Overseas Investment Corp. (financial services) (2009 – 2012); Director, Financial Models (technology) (2005-2007); Director, BNY Hamilton Funds, Ireland (offshore investment companies) (2004-2007); Chairman/Director, AIB/BNY Securities Services, Ltd., Ireland (financial services) (1999-2006); Chairman, BNY Alternative Investment Services, Inc. (financial services) (2005-2007)	None

60Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

Interested Trustees

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Trustee During At Least The Past Five Years
Lisa M. Jones (61)** Trustee, President and Chief Executive Officer	Trustee since 2022. Serves until a successor trustee is elected or earlier retirement or removal	Director, CEO and President of Amundi US, Inc. (investment management firm) (since September 2014); Director, CEO and President of Amundi Asset Management US, Inc. (since September 2014); Director, CEO and President of Amundi Distributor US, Inc. (since September 2014); Director, CEO and President of Amundi Asset Management US, Inc. (since September 2014); Chair, Amundi US, Inc., Amundi Distributor US, Inc. and Amundi Asset Management US, Inc. (September 2014 – 2018); Managing Director, Morgan Stanley Investment Management (investment management firm) (2010 – 2013); Director of Institutional Business, CEO of International, Eaton Vance Management (investment management firm) (2005 – 2010); Director of Amundi Holdings US, Inc. (since 2017)	Director of Clearwater Analytics (provider of web-based investment accounting software for reporting and reconciliation services) (September 2022 – present)
Kenneth J. Taubes (65)** Trustee	Trustee since 2022. Serves until a successor trustee is elected or earlier retirement or removal	Director and Executive Vice President (since 2008) and Chief Investment Officer, U.S. (since 2010) of Amundi US, Inc. (investment management firm); Director and Executive Vice President and Chief Investment Officer, U.S. of Amundi US (since 2008); Executive Vice President and Chief Investment Officer, U.S. of Amundi Asset Management US, Inc. (since 2009); Portfolio Manager of Amundi US (since 1999); Director of Amundi Holdings US, Inc. (since 2017)	None
** Ms. Jones and Mr. Taubes are Interested Trustees because they are officers or directors of the Fund’s investment adviser and certain of its affiliates.

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2361

Table of Contents

Fund Officers

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Officer During At Least The Past Five Years
Christopher J. Kelley (58) Secretary and Chief Legal Officer	Since 2022. Serves at the discretion of the Board	Vice President and Associate General Counsel of Amundi US since January 2008; Secretary and Chief Legal Officer of all of the Pioneer Funds since June 2010; Assistant Secretary of all of the Pioneer Funds from September 2003 to May 2010; Vice President and Senior Counsel of Amundi US from July 2002 to December 2007	None
Thomas Reyes (60) Assistant Secretary	Since 2022. Serves at the discretion of the Board	Assistant General Counsel of Amundi US since May 2013 and Assistant Secretary of all the Pioneer Funds since June 2010; Counsel of Amundi US from June 2007 to May 2013	None
Heather L. Melito-Dezan (46) Assistant Secretary	Since 2022. Serves at the discretion of the Board	Director - Trustee and Board Relationships of Amundi US since September 2019; Assistant Secretary of Amundi US, Inc. since July 2020: Assistant Secretary of Amundi Asset Management US, Inc. since July 2020: Assistant Secretary of Amundi Distributor US, Inc. since July 2020; Assistant Secretary of all the Pioneer Funds since September 2022; Private practice from 2017 – 2019.	None
Anthony J. Koenig, Jr. (59) Treasurer and Chief Financial and Accounting Officer	Since 2022. Serves at the discretion of the Board	Managing Director, Chief Operations Officer and Fund Treasurer of Amundi US since May 2021; Treasurer of all of the Pioneer Funds since May 2021; Assistant Treasurer of all of the Pioneer Funds from January 2021 to May 2021; and Chief of Staff, US Investment Management of Amundi US from May 2008 to January 2021	None
Luis I. Presutti (58) Assistant Treasurer	Since 2022. Serves at the discretion of the Board	Director – Fund Treasury of Amundi US since 1999; and Assistant Treasurer of all of the Pioneer Funds since 1999	None
Gary Sullivan (65) Assistant Treasurer	Since 2022. Serves at the discretion of the Board	Senior Manager – Fund Treasury of Amundi US since 2012; and Assistant Treasurer of all of the Pioneer Funds since 2002	None

62Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/23

Table of Contents

Name, Age and Position Held With the Fund	Term of Office and Length of Service	Principal Occupation(s) During At Least The Past Five Years	Other Directorships Held by Officer During At Least The Past Five Years
Antonio Furtado (41) Assistant Treasurer	Since 2022. Serves at the discretion of the Board	Fund Oversight Manager – Fund Treasury of Amundi US since 2020; Assistant Treasurer of all of the Pioneer Funds since 2020; and Senior Fund Treasury Analyst from 2012 - 2020	None
Michael Melnick (52) Assistant Treasurer	Since 2022. Serves at the discretion of the Board	Vice President - Deputy Fund Treasurer of Amundi US since May 2021; Assistant Treasurer of all of the Pioneer Funds since July 2021; Director of Regulatory Reporting of Amundi US from 2001 – 2021; and Director of Tax of Amundi US from 2000 - 2001	None
John Malone (52) Chief Compliance Officer	Since 2022. Serves at the discretion of the Board	Managing Director, Chief Compliance Officer of Amundi US Asset Management; Amundi Asset Management US, Inc.; and the Pioneer Funds since September 2018; Chief Compliance Officer of Amundi Distributor US, Inc. since January 2014.	None
Brandon Austin (51) Anti-Money Laundering Officer	Since 2022. Serves at the discretion of the Board	Director, Financial Security – Amundi Asset Management; Anti-Money Laundering Officer of all the Pioneer Funds since March 2022: Director of Financial Security of Amundi US since July 2021; Vice President, Head of BSA, AML and OFAC, Deputy Compliance Manager, Crédit Agricole Indosuez Wealth Management (investment management firm) (2013 – 2021)	None

Amundi Climate Transition Core Bond Fund | Annual Report | 7/31/2363

Table of Contents

How to Contact Amundi

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^SMfor automated fund yields, prices,
account information and transactions

1-800-225-4321

Retirement plans information

1-800-622-0176

Write to us:

Amundi
P.O. Box 534427
Pittsburgh, PA 15253-4427

Our toll-free fax	1-800-225-4240
Our internet e-mail address	us.askamundi@amundi.com (for general questions about Amundi only)

Visit our web site: www.amundi.com/us

This report must be preceded or accompanied by a prospectus.

Table of Contents

Amundi Asset Management US, Inc.
60 State Street
Boston, MA 02109

www.amundi.com/us

Securities offered through Amundi Distributor US, Inc.
60 State Street, Boston, MA 02109
Underwriter of Pioneer Mutual Funds, Member SIPC
© 2023 Amundi Asset Management US, Inc. 33458-00-0923

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)).

Mr. Fred J. Ricciardi, 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.

The audit fees for the Trust were $219,520 payable to Ernst & Young LLP for the year ended July 31, 2023 and $167,808 for the year ended July 31, 2022.

(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.

The audit-related services fees for the Trust were $14,991 payable to Ernst & Young LLP for the year ended July 31, 2023 and $3,354 for the year ended July 31, 2022.

(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.

The Trust paid aggregate non-audit fees to Ernst & Young LLP for tax services of $45,403 and $29,234 during the fiscal years ended July 31, 2023 and 2022, respectively.

(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.

There were no other fees in 2023 or 2022.

(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 Amundi Asset Management US, Inc., 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 CATEGORY	SERVICE CATEGORY DESCRIPTION	SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES
I. AUDIT SERVICES	Services that are directly related to performing the independent audit of the Funds	o Accounting research assistance o SEC consultation, registration 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. AUDIT-RELATED SERVICES	Services which are not prohibited under Rule 210.2-01(C)(4) (the “Rule”) and are related extensions of the audit services support the 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.)	o AICPA attest and agreed-upon procedures o Technology control assessments o Financial reporting control assessments o Enterprise security architecture assessment

AUDIT COMMITTEE APPROVAL POLICY

AUDIT COMMITTEE REPORTING POLICY

o “One-time” pre-approval for the audit period for all pre-approved specific service subcategories. Approval of the independent auditors as auditors for a Fund shall constitute pre approval for these services.

o “One-time” pre-approval for the fund fiscal year within a specified dollar limit for all pre-approved specific service subcategories

o A summary of all such services and related fees reported at each regularly scheduled Audit Committee meeting.

o A summary of all such services and related fees (including comparison to specified dollar limits) 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 DESCRIPTION

SPECIFIC PRE-APPROVED
SERVICE SUBCATEGORIES

III. TAX SERVICES

o Tax planning and support

o Tax controversy assistance

o Tax compliance, tax returns, excise tax returns and support

o Tax opinions

AUDIT COMMITTEE APPROVAL POLICY

AUDIT COMMITTEE REPORTING POLICY

o “One-time” pre-approval for the fund fiscal year within a specified dollar limit

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”

o A summary of all such services and related fees (including comparison to specified dollar limits) reported quarterly.

SECTION III—POLICY DETAIL, CONTINUED

SERVICE CATEGORY

SERVICE CATEGORY DESCRIPTION

SPECIFIC PRE-APPROVED
SERVICE SUBCATEGORIES

IV. OTHER SERVICES

A. SYNERGISTIC, UNIQUE QUALIFICATIONS

Services which are not prohibited by the Rule, if an officer of the Fund 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.

o Business Risk Management support

o Other control and regulatory compliance projects

AUDIT COMMITTEE APPROVAL POLICY

AUDIT COMMITTEE REPORTING POLICY

o “One-time” pre-approval for the fund fiscal year within a specified dollar limit

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”

o A summary of all such services and related fees (including comparison to specified dollar limits) reported quarterly.

SECTION III—POLICY DETAIL, CONTINUED


SERVICE CATEGORY	SERVICE CATEGORY DESCRIPTION	SPECIFIC PROHIBITED SERVICE SUBCATEGORIES
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

Beginning with non-audit service contracts entered into on or after May 6, 2003, the effective date of the new SEC pre-approval rules, the Trust’s audit committee is required to pre-approve services to affiliates defined by SEC rules to the extent that the services are determined to have a direct impact on the operations or financial reporting of the Trust. For the years ended July 31, 2023 and 2022, there were no services provided to an affiliate that required the Trust’s audit committee pre-approval.

(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.

The Trust paid aggregate non-audit fees to Ernst & Young LLP for tax services of $45,403 and $29,234 during the fiscal years ended July 31, 2023 and 2022, respectively.

(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.

(i) A registrant identified by the Commission pursuant to Section 104(i)(2)(A) of the Sarbanes-Oxley Act of 2002 (15 U.S.C. 7214(i)(2)(A)), as having retained, for the preparation of the audit report on its financial statements included in the Form NCSR, a registered public accounting firm that has a branch or office that is located in a foreign jurisdiction and that the Public Company Accounting Oversight Board has determined it is unable to inspect or investigate completely because of a position taken by an authority in the foreign jurisdiction must electronically submit to the Commission on a supplemental basis documentation that establishes that the registrant is not owned or controlled by a governmental entity in the foreign jurisdiction. The registrant must submit this documentation on or before the due date for this form. A registrant that is owned or controlled by a foreign governmental entity is not required to submit such documentation. N/A

(j) A registrant that is a foreign issuer, as defined in 17 CFR 240.3b-4, identified by the Commission pursuant to Section 104(i)(2)(A) of the Sarbanes-Oxley Act of 2002 (15 U.S.C. 7214(i)(2)(A)), as having retained, for the preparation of the audit report on its financial statements included in the Form N-CSR, a registered public accounting firm that has a branch or office that is located in a foreign jurisdiction and that the Public Company Accounting Oversight Board has determined it is unable to inspect or investigate completely because of a position taken by an authority in the foreign jurisdiction, for each year in which the registrant is so identified, must provide the below disclosures. Also, any such identified foreign issuer that uses a variable-interest entity or any similar structure that results in additional foreign entities being consolidated in the financial statements of the registrant is required to provide the below disclosures for itself and its consolidated foreign operating entity or entities. A registrant must disclose:

(1) That, for the immediately preceding annual financial statement period, a registered public accounting firm that the PCAOB was unable to inspect or investigate completely, because of a position taken by an authority in the foreign jurisdiction, issued an audit report for the registrant; N/A

(2) The percentage of shares of the registrant owned by governmental entities in the foreign jurisdiction in which the registrant is incorporated or otherwise organized; N/A

(3) Whether governmental entities in the applicable foreign jurisdiction with respect to that registered public accounting firm have a controlling financial interest with respect to the registrant; N/A

(4) The name of each official of the Chinese Communist Party who is a member of the board of directors of the registrant or the operating entity with respect to the registrant; N/A

(5) Whether the articles of incorporation of the registrant (or equivalent organizing document) contains any charter of the Chinese Communist Party, including the text of any such charter. N/A

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 occurred during 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 period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant’s internal control over financial reporting.

Item 12. Disclosure of Securities Lending Activities for Closed-End Management Investment Companies.

(a) If the registrant is a closed-end management investment company, provide the following dollar amounts of income and compensation related to the securities lending activities of the registrant during its most recent fiscal year:

N/A

(1) Gross income from securities lending activities;

N/A

(2) All fees and/or compensation for each of the following securities lending activities and related services: any share of revenue generated by the securities lending program paid to the securities lending agent(s) (revenue split); fees paid for cash collateral management services (including fees deducted from a pooled cash collateral reinvestment vehicle) that are not included in the revenue split; administrative fees that are not included in the revenue split; fees for indemnification that are not included in the revenue split; rebates paid to borrowers; and any other fees relating to the securities lending program that are not included in the revenue split, including a description of those other fees;

N/A

(3) The aggregate fees/compensation disclosed pursuant to paragraph (2); and

N/A

(4) Net income from securities lending activities (i.e., the dollar amount in paragraph (1) minus the dollar amount in paragraph (3)).

If a fee for a service is included in the revenue split, state that the fee is included in the revenue split.

N/A

(b) If the registrant is a closed-end management investment company, describe the services provided to the registrant by the securities lending agent in the registrants most recent fiscal year.

N/A

ITEM 13. 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.

(b) Certifications pursuant to Rule 30a-2(b) under the 1940 Act and Section 906 of the Sarbanes-Oxley Act of 2002 are attached hereto.

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 Series Trust IV

By (Signature and Title)* /s/ Lisa M. Jones

Lisa M. Jones, President and Chief Executive Officer

Date October 5, 2023

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/ Lisa M. Jones

Lisa M. Jones, President and Chief Executive Officer

Date October 5, 2023

By (Signature and Title)* /s/ Anthony J. Koenig, Jr.

Anthony J. Koenig, Jr., Managing Director, Chief Operations Officer & Treasurer of the Funds

Date October 5, 2023

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

Pioneer Series Trust IV N-CSRCertified annual shareholder report (management investment company)