N-CSR

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 811-23613

Pioneer Core Trust I

(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: August 31, 2023

Date of reporting period: September 1, 2022 through August 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 High Income Municipal Portfolio

Annual Report  |  August 31, 2023

visit us: www.amundi.com/us

Table of Contents

President’s Letter	2
Portfolio Management Discussion	4
Portfolio Summary	10
Performance Update	12
Comparing Ongoing Portfolio Expenses	13
Schedule of Investments	15
Financial Statements	33
Notes to Financial Statements	37
Report of Independent Registered Public Accounting Firm	46
Statement Regarding Liquidity Risk Management Program	48
Trustees, Officers and Service Providers	50

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President’s Letter

Dear Investors,

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 investors, we have many options. It is our view that active management can serve investors 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.

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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.
October 2023

Any information in this report to investors regarding market or economic trends or the factors influencing the Portfolio's historical or future performance are statements of opinion as of the date of this report. Past performance is no guarantee of future results.

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Portfolio Management Discussion  |  8/31/23

In the following interview, Jonathan Chirunga and David Eurkus discuss the factors that influenced the performance of Pioneer High Income Municipal Portfolio during the 12-month period ended August 31, 2023. Mr. Chirunga, Managing Director, Director of High-Yield Municipal Bonds, and a portfolio manager at Amundi Asset Management US, Inc. (Amundi US), is responsible for the day-to-day management of the Portfolio, along with Mr. Eurkus, Managing Director, Director of Municipals, and a portfolio manager at Amundi US.

Q	How did the Portfolio perform during the 12-month period ended August 31, 2023?
A	Pioneer High Income Municipal Portfolio returned -2.71% during the 12-month period ended August 31, 2023, while the Portfolio’s benchmark, the Bloomberg U.S. Municipal High Yield Bond Index (the Bloomberg Index), returned 0.52%. During the same period, the average return of the 197 mutual funds in Morningstar’s High-Yield Municipal Funds category was -0.67%.
Q	How would you describe the investment environment for municipal bonds during the 12-month period ended August 31, 2023?
A	High-yield municipal bonds, as measured by the Portfolio’s benchmark, Bloomberg Index, posted a narrow gain for the 12-month period, with the benefit of increased contributions to returns from income (driven in part by higher interest rates) helping to offset a decline in bond prices. The broader fixed-income market faced headwinds during the period, due to a combination of persistent inflation and uncertainty with regard to how long the U.S. Federal Reserve (Fed) would need to continue raising interest rates in order to curb said inflation. High-yield municipals faced additional pressure during the period as market participants worried about slowing economic growth and the potential effect such a scenario would have on state and local tax revenues. That factor contributed to the underperformance of the Bloomberg Index when measured against the investment-grade Bloomberg Municipal Bond Index, which returned 1.70% for the 12-month period.
	Despite the uneven performance, the municipal bond market continued to receive strong support during the period from ongoing strength in underlying credit quality. State tax revenues have remained near record highs, allowing many issuers to build

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	up reserves in order to strengthen their financial positions ahead of a possible slowdown in economic growth. In addition, the supply-and-demand dynamic in the municipal market was quite supportive. Investors’ demand for municipals has remained robust in a continued higher-yield environment, and the strong cash positions of issuers as well as general caution about the economy kept new-issue supply in the market relatively limited over the 12-month period.
Q	What factors affected the Portfolio’s performance relative to the Bloomberg Index during the 12-month period ended August 31, 2023?
A	The Portfolio’s significant underweight to bonds issued by the Commonwealth of Puerto Rico was the primary reason for the shortfall in benchmark-relative performance during the 12-month period. The Portfolio’s weighting to Puerto Rico’s bonds, which performed well during the period, stood at roughly 3% of invested assets, while the  Commonwealth’s weighting in the Bloomberg Index was at approximately 17%. In addition, the Portfolio’s underweight allocations to state general obligation debt and to the water-and-sewer sector detracted from benchmark-relative returns for the period. On the other hand, the Portfolio’s benchmark-relative results benefited from modest allocations to bonds in the housing and leasing sectors, and from a relative underweight to the transportation sector.
	At the individual security level, key positive contributors to the Portfolio’s benchmark-relative returns for the period included holdings of Buckeye (Ohio) tobacco Master Settlement Agreement (MSA) revenue bonds and Puerto Rico Sales Tax Financing Corporation revenue bonds. Notable individual detractors from the Portfolio’s relative performance included positions in Oroville (California) revenue bonds and New Jersey Economic Development Authority revenue bonds.
	With regard to tobacco MSA bonds, we have found the bonds to be attractive investments, not only for their potential to enhance performance, but also for the benefits received by the settling states that have issued tobacco bonds since the establishment of the MSA between the settling states and the tobacco-related companies several years ago. Those benefits have

Pioneer High Income Municipal Portfolio | Annual Report | 8/31/235

	included: substantial funding for the advancement of public health; the implementation of important tobacco-related public health measures; and funding towards establishment of a national foundation dedicated to significantly reducing the use of tobacco products among youths.
Q	Did the Portfolio have any exposure to derivative securities during the 12-month period ended August 31, 2023?
A	No, the Portfolio had no exposure to derivatives during the period.
Q	What were some notable aspects of the Portfolio’s positioning as of August 31, 2023?
A	As of period-end, the Portfolio was overweight versus the benchmark to the tobacco and charter school sectors, based on our belief that both areas of the municipal bond market were poised for continued outperformance. We made slight increases to the Portfolio’s allocations to both sectors over the course of the 12-month period. Conversely, we have maintained the Portfolio’s benchmark-relative underweight to Puerto Rico’s debt, due to our concerns regarding the Commonwealth’s sensitivity to economic cycles, the ebbs and flows of the tourism industry, and hurricanes.
Q	What is your investment outlook?
A	We believe the high-yield municipal market has continued to offer very compelling valuations following an extended period of uncertainty about both inflation and the economic outlook. As of period-end, the bonds of issuers with historically strong credit profiles were valued at attractive tax-exempt yields in excess of 5% and even higher. In addition, default rates in the municipal bond market have remained modest relative to the default rates in the corporate bond market. We are also encouraged by the prospect of moderate new-issue supply that could remain well balanced by continued strength on the investor-demand side.
	As is always the case, headline news events have had a minimal effect on our day-to-day approach to managing the portfolio. Our goal is to invest the Portfolio in what we believe are fundamentally sound credits with attractive yields, while

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maintaining an appropriate level of diversification*. We also seek to avoid experiencing defaults in the Portfolio through our emphasis on fundamental research. We believe this steady, long-term approach remains the most effective way to identify opportunities and to help minimize the risk associated with investing in the high-yield municipal market.

* Diversification does not assure a profit nor protect against loss

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Please refer to the Schedule of Investments on pages 15  - 32  for a full listing of Portfolio 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.

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 Portfolio will generally fall. Conversely, when interest rates fall, the prices of fixed income securities in the Portfolio will generally rise.

Investments in the Portfolio are subject to possible loss due to the financial failure of issuers of underlying securities and their inability to meet their debt obligations.

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 Portfolio's transactions and financial markets generally cannot yet be determined.

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 Portfolio would experience a decline in income and lose the opportunity for additional price appreciation.

The value of municipal securities can be adversely affected by changes in financial condition of municipal issuers, lowe revenues, and regulatory and political developments.

A portion of income may be subject to local, state, federal, and/or alternative minimum tax. Capital gains, if any, are subject to a capital gains tax.

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The Portfolio may use derivatives, such as options, futures, inverse floating rate obligations, swaps, and others, which can be illiquid, may disproportionately increase losses, and have a potentially large impact on Portfolio performance. Derivatives may have a leveraging effect on the Portfolio.

This material must be preceded or accompanied by the Portfolio's current registration statement. Before investing, consider the product's investment objectives, risks, charges, and expenses. Read it carefully.

Any information in this report to investors regarding market or economic trends or the factors influencing the Portfolio'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.

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Portfolio Summary  |  8/31/23 

Portfolio Diversification

(As a percentage of total investments)*

State Diversification

(As a percentage of total investments)*

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10 Largest Holdings

(As a percentage of total investments)*
1.	Buckeye Tobacco Settlement Financing Authority, Senior Class 2, Series B2, 5.00%, 6/1/55	3.62%
2.	Golden State Tobacco Securitization Corp., Series A1, 4.214%, 6/1/50	3.49
3.	Tobacco Settlement Financing Corp., Series B1, 5.00%, 6/1/47	2.99
4.	Arkansas Development Finance Authority, Big River Steel Project, 4.50%, 9/1/49 (144A)	2.54
5.	New York Counties Tobacco Trust IV, Settlement pass through, Series A, 5.00%, 6/1/45	2.35
6.	TSASC, Inc., Series B, 5.00%, 6/1/48	2.22
7.	TSASC, Inc., Series B, 5.00%, 6/1/45	2.01
8.	Dominion Water & Sanitation District, 5.875%, 12/1/52	1.95
9.	California Statewide Communities Development Authority, Loma Linda University Medical Center, Series A, 5.25%, 12/1/56 (144A)	1.91
10.	City of Hammond, Custodial Receipts Cabelas Project, 7.50%, 2/1/29 (144A)	1.90

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

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Performance Update  |  8/31/23

Investment Returns

The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer High Income Municipal Portfolio during the periods shown, compared to that of the Bloomberg U.S. Municipal High Yield Bond Index.

Average Annual Total Return (As of August 31, 2023)
Period	Portfolio	Bloomberg U.S. Municipal High Yield Bond Index
Life-of-Portfolio (12/21/20)	0.00%	-1.06%
1 Year	-2.71	0.52

Value of $10,000 Investment

 Performance of the Portfolio shown in the graph above is from the inception of the Portfolio on 12/21/20 through 8/31/23. Index information shown in the graph above is from 12/31/20 through 8/31/23.

The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and interests, when withdrawn may be worth more or less than their original cost.

All results are historical.

Please see the registration statement and financial statements for more information.

The Bloomberg U.S. Municipal High Yield Bond Index is an unmanaged measure of the performance of the high-yield municipal 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.

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Comparing Ongoing Portfolio Expenses

As an investor in the Portfolio, you incur two types of costs:

(1)	ongoing costs, including management fees and other Portfolio expenses; and
(2)	transaction costs.

This example is intended to help you understand your ongoing expenses (in dollars) of investing in the Portfolio 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 Portfolio’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 High Income Municipal Portfolio

Based on actual returns from March 1, 2023 through August 31, 2023.

Beginning Account Value on 3/1/23	$1,000.00
Ending Account Value (after expenses) on 8/31/23	$986.00
Expenses Paid During Period*	$0.10

* Expenses are equal to the Portfolio’s annualized net expense ratio of 0.02% multiplied by the average account value over the period, multiplied by 184/365 (to reflect the partial year period).

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Comparing Ongoing Portfolio Expenses

(continued)

Hypothetical Example for Comparison Purposes

The table below provides information about hypothetical account values and hypothetical expenses based on the Portfolio’s actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Portfolio’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 Portfolio 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 High Income Municipal Portfolio

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

Beginning Account Value on 3/1/23	$1,000.00
Ending Account Value (after expenses) on 8/31/23	$1,025.10
Expenses Paid During Period*	$0.10

* Expenses are equal to the Portfolio’s annualized net expense ratio of 0.02% multiplied by the average account value over the period, multiplied by 184/365 (to reflect the partial year period).

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Schedule of Investments  |  8/31/23 

Principal Amount USD ($)		Value
	UNAFFILIATED ISSUERS — 96.5%
	Municipal Bonds — 95.8% of Net Assets(a)
	Alabama — 0.3%
4,525,000	Hoover Industrial Development Board, 5.75%, 10/1/49	$    4,471,515
	Total Alabama	$ 4,471,515
	Arizona — 1.7%
1,725,000	Arizona Industrial Development Authority, Doral Academy Nevada Fire Mesa, Series A, 5.00%, 7/15/39	$    1,604,284
1,675,000	Arizona Industrial Development Authority, Doral Academy Nevada Fire Mesa, Series A, 5.00%, 7/15/49	1,520,867
125,000	Arizona Industrial Development Authority, Doral Academy Of Northern Nevada Project, Series A, 4.00%, 7/15/27 (144A)	118,666
265,000	Arizona Industrial Development Authority, Doral Academy Of Northern Nevada Project, Series A, 4.00%, 7/15/41 (144A)	210,270
1,115,000	Arizona Industrial Development Authority, Doral Academy Of Northern Nevada Project, Series A, 4.00%, 7/15/51 (144A)	793,646
1,040,000	Arizona Industrial Development Authority, Doral Academy Of Northern Nevada Project, Series A, 4.00%, 7/15/56 (144A)	709,831
12,595,000	Industrial Development Authority of the City of Phoenix, 3rd & Indian School Assisted Living Project, 5.40%, 10/1/36	10,897,194
1,000,000	Industrial Development Authority of the County of Pima, Facility Desert Heights Charter, 7.00%, 5/1/34	1,017,880
3,000,000	Industrial Development Authority of the County of Pima, Facility Desert Heights Charter, 7.25%, 5/1/44	3,050,340
1,810,000	Tempe Industrial Development Authority, Series A, 6.125%, 10/1/47 (144A)	1,105,566
2,400,000	Tempe Industrial Development Authority, Series A, 6.125%, 10/1/52 (144A)	1,391,088
	Total Arizona	$ 22,419,632
	Arkansas — 3.5%
35,000,000	Arkansas Development Finance Authority, Big River Steel Project, 4.50%, 9/1/49 (144A)	$   32,187,750
14,500,000	Arkansas Development Finance Authority, Green Bond, 5.45%, 9/1/52	14,072,395
	Total Arkansas	$ 46,260,145

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

Pioneer High Income Municipal Portfolio | Annual Report | 8/31/2315

Schedule of Investments  |  8/31/23 (continued)

Principal Amount USD ($)		Value
	California — 15.2%
1,755,000	California County Tobacco Securitization Agency, 5.00%, 6/1/50	$    1,719,953
60,000	California County Tobacco Securitization Agency, Asset-Backed, Series A, 5.875%, 6/1/43	60,201
1,370,000	California County Tobacco Securitization Agency, Golden Gate Tobacco Settlement, Series A, 5.00%, 6/1/47	1,254,345
185,000	California Municipal Finance Authority, Series A, 5.00%, 12/1/36 (144A)	186,868
2,000,000	California Municipal Finance Authority, Series A, 5.00%, 12/1/46 (144A)	1,898,640
2,000,000	California Municipal Finance Authority, Series A, 5.00%, 12/1/54 (144A)	1,847,640
2,910,000	California Municipal Finance Authority, Series B, 4.75%, 12/1/31 (144A)	2,629,301
6,115,000	California Municipal Finance Authority, Series B, 5.25%, 12/1/36 (144A)	5,444,674
4,530,000	California Municipal Finance Authority, Series B, 5.50%, 12/1/39 (144A)	4,018,654
2,000,000	California Municipal Finance Authority, Baptist University, Series A, 5.00%, 11/1/46 (144A)	1,848,800
8,350,000	California Municipal Finance Authority, Baptist University, Series A, 5.50%, 11/1/45 (144A)	8,195,024
250,000	California Municipal Finance Authority, John Adams Academics Project, Series A, 5.00%, 10/1/35	252,835
1,550,000	California Municipal Finance Authority, John Adams Academics Project, Series A, 5.25%, 10/1/45	1,567,313
500,000	California Municipal Finance Authority, Santa Rosa Academy Project, 5.125%, 7/1/35 (144A)	500,735
1,575,000	California Municipal Finance Authority, Santa Rosa Academy Project, 5.375%, 7/1/45 (144A)	1,613,383
280,000	California School Finance Authority, Stem Preparatory Schools, Series A, 5.00%, 6/1/43 (144A)	270,183
500,000	California School Finance Authority, Stem Preparatory Schools, Series A, 5.125%, 6/1/53 (144A)	469,250
1,000,000	California School Finance Authority, Stem Preparatory Schools, Series A, 5.375%, 5/1/63 (144A)	945,300
100,000	California School Finance Authority, View Park Elementary & Middle School, Series A, 4.75%, 10/1/24	99,183
830,000	California School Finance Authority, View Park Elementary & Middle School, Series A, 5.625%, 10/1/34	823,028

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

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Principal Amount USD ($)		Value
	California — (continued)
3,175,000	California School Finance Authority, View Park Elementary & Middle School, Series A, 5.875%, 10/1/44	$    3,128,613
1,000,000	California School Finance Authority, View Park Elementary & Middle School, Series A, 6.00%, 10/1/49	945,910
3,230,000	California School Finance Authority, View Park High School, Series A, 7.125%, 10/1/48 (144A)	3,240,078
1,875,000	California Statewide Communities Development Authority, Baptist University, Series A, 5.00%, 11/1/41 (144A)	1,802,175
1,560,000	California Statewide Communities Development Authority, Baptist University, Series A, 6.125%, 11/1/33 (144A)	1,562,855
4,030,000	California Statewide Communities Development Authority, Baptist University, Series A, 6.375%, 11/1/43 (144A)	4,035,118
5,475,000	California Statewide Communities Development Authority, Loma Linda University Medical Center, 5.25%, 12/1/43 (144A)	5,217,292
6,165,000	California Statewide Communities Development Authority, Loma Linda University Medical Center, 5.50%, 12/1/54	6,188,612
20,760,000	California Statewide Communities Development Authority, Loma Linda University Medical Center, 5.50%, 12/1/58 (144A)	19,816,043
3,500,000	California Statewide Communities Development Authority, Loma Linda University Medical Center, Series A, 5.00%, 12/1/46 (144A)	3,289,020
25,320,000	California Statewide Communities Development Authority, Loma Linda University Medical Center, Series A, 5.25%, 12/1/56 (144A)	24,245,166
700,000	City of Oroville, Oroville Hospital, 5.25%, 4/1/34	420,840
6,980,000	City of Oroville, Oroville Hospital, 5.25%, 4/1/39	4,197,213
34,720,000	City of Oroville, Oroville Hospital, 5.25%, 4/1/49	20,899,704
31,800,000	City of Oroville, Oroville Hospital, 5.25%, 4/1/54	19,145,190
64,000,000	Golden State Tobacco Securitization Corp., Series A1, 4.214%, 6/1/50	44,277,760

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

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Schedule of Investments  |  8/31/23 (continued)

Principal Amount USD ($)		Value
	California — (continued)
2,500,000(b)	Pittsburg Unified School District Financing Authority, Capital Appreciation General Obligation Pittsburg, 9/1/41 (AGM Insured)	$    1,135,250
1,925,000(b)	Pittsburg Unified School District Financing Authority, Capital Appreciation General Obligation Pittsburg, 9/1/42 (AGM Insured)	834,025
	Total California	$ 200,026,174
	Colorado — 7.4%
4,535,000(c)	2000 Holly Metropolitan District, Series A, 5.00%, 12/1/50	$    3,951,572
577,000(c)	2000 Holly Metropolitan District, Series B, 7.50%, 12/15/50	526,778
3,000,000	Aerotropolis Regional Transportation Authority, 4.375%, 12/1/52	2,265,390
1,735,000(c)	Belleview Village Metropolitan District, 4.95%, 12/1/50	1,429,866
1,250,000(c)	Cottonwood Highlands Metropolitan District No. 1, Series A, 5.00%, 12/1/49	1,125,425
2,090,000(c)	Cottonwood Highlands Metropolitan District No. 1, Series B, 8.75%, 12/15/49	2,108,643
4,090,000(c)	Crystal Crossing Metropolitan District, 5.25%, 12/1/40	4,052,945
26,000,000	Dominion Water & Sanitation District, 5.875%, 12/1/52	24,719,500
8,425,000(c)	Green Valley Ranch East Metropolitan District No. 6, Series A, 5.875%, 12/1/50	8,105,945
15,270,000(c)	Larkridge Metropolitan District No. 2, 5.25%, 12/1/48	14,145,975
5,261,000(c)	Littleton Village Metropolitan District No. 2, 5.375%, 12/1/45	5,107,642
1,125,000	Nine Mile Metropolitan District, 4.625%, 12/1/30	1,060,515
9,760,000	Nine Mile Metropolitan District, 5.125%, 12/1/40	9,151,952
1,000,000	Rampart Range Metropolitan District No 5, 4.00%, 12/1/51	683,480
1,000,000(c)	Ridgeline Vista Metropolitan District, Series A, 5.25%, 12/1/60	912,510
2,000,000(c)	Settler's Crossing Metropolitan District No. 1, Series A, 5.00%, 12/1/40 (144A)	1,838,580
3,760,000(c)	Settler's Crossing Metropolitan District No. 1, Series A, 5.125%, 12/1/50 (144A)	3,235,818
597,000(c)	Settler's Crossing Metropolitan District No. 1, Series B, 7.625%, 12/15/50	584,081
1,722,000(c)	Village at Dry Creek Metropolitan District No. 2, 4.375%, 12/1/44	1,483,675

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

18Pioneer High Income Municipal Portfolio | Annual Report | 8/31/23

Principal Amount USD ($)		Value
	Colorado — (continued)
1,246,000(c)	Villas Metropolitan District, Series A, 5.125%, 12/1/48	$    1,132,427
4,280,000(c)	Willow Bend Metropolitan District, Series A, 5.00%, 12/1/39	4,042,375
5,375,000(c)	Willow Bend Metropolitan District, Series A, 5.00%, 12/1/49	4,742,040
755,000(c)	Willow Bend Metropolitan District, Series B, 7.625%, 12/15/49	678,526
	Total Colorado	$ 97,085,660
	Delaware — 0.2%
2,250,000	Delaware State Economic Development Authority, Aspira of Delaware Charter, 4.00%, 6/1/52	$    1,631,362
1,380,000	Delaware State Economic Development Authority, Aspira of Delaware Charter, 4.00%, 6/1/57	961,612
	Total Delaware	$ 2,592,974
	District of Columbia — 0.5%
845,000	District of Columbia, Inspired Teaching Demonstration Public Charter School, 5.00%, 7/1/32	$       863,379
1,500,000	District of Columbia, Inspired Teaching Demonstration Public Charter School, 5.00%, 7/1/42	1,492,395
1,165,000	District of Columbia, Inspired Teaching Demonstration Public Charter School, 5.00%, 7/1/47	1,121,499
1,835,000	District of Columbia, Inspired Teaching Demonstration Public Charter School, 5.00%, 7/1/52	1,759,508
710,000	District of Columbia Tobacco Settlement Financing Corp., Asset-Backed, 6.75%, 5/15/40	726,294
	Total District of Columbia	$ 5,963,075
	Florida — 1.4%
500,000(d)	Capital Trust Agency, Inc., Series B, 5.00%, 7/1/43	$        40,000
750,000(d)	Capital Trust Agency, Inc., Series B, 5.00%, 7/1/53	60,000
500,000(d)	Capital Trust Agency, Inc., Series B, 5.25%, 7/1/48	40,000
850,000	County of Lake, 5.00%, 1/15/54 (144A)	769,590
270,000	County of Lake, Imagine South Lake Charter School Project, 5.00%, 1/15/29 (144A)	269,714
1,250,000	County of Lake, Imagine South Lake, Charter School Project, 5.00%, 1/15/39 (144A)	1,248,975
2,350,000	County of Lake, Imagine South Lake, Charter School Project, 5.00%, 1/15/49 (144A)	2,149,122
300,000	Florida Development Finance Corp., Glenridge On Palmer Ranch Project, 5.00%, 6/1/31 (144A)	287,787
13,475,000	Florida Development Finance Corp., Glenridge On Palmer Ranch Project, 5.00%, 6/1/51 (144A)	10,267,680

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

Pioneer High Income Municipal Portfolio | Annual Report | 8/31/2319

Schedule of Investments  |  8/31/23 (continued)

Principal Amount USD ($)		Value
	Florida — (continued)
225,000	Florida Development Finance Corp., The Glenridge On Palmer Ranch Project, 5.00%, 6/1/35 (144A)	$       203,785
2,500,000	Palm Beach County Health Facilities Authority, Toby & Leon Cooperman Sinai, 4.25%, 6/1/56	1,697,025
2,000,000	Village Community Development District No 15, 5.25%, 5/1/54 (144A)	1,950,260
	Total Florida	$ 18,983,938
	Guam — 0.1%
1,100,000	Guam Economic Development & Commerce Authority, Asset-Backed, 5.625%, 6/1/47	$    1,046,331
	Total Guam	$ 1,046,331
	Illinois — 7.3%
1,650,000	Chicago Board of Education, 5.75%, 4/1/35	$    1,735,025
8,010,000	Chicago Board of Education, 6.00%, 4/1/46	8,343,697
12,170,000(c)	Chicago Board of Education, Series A, 5.00%, 12/1/42	11,601,904
1,000,000(c)	Chicago Board of Education, Series A, 7.00%, 12/1/46 (144A)	1,061,500
8,000,000(c)	Chicago Board of Education, Series B, 6.50%, 12/1/46	8,350,240
2,035,000(c)	Chicago Board of Education, Series C, 5.00%, 12/1/34	2,053,376
1,415,000(c)	Chicago Board of Education, Series C, 5.25%, 12/1/39	1,396,732
11,655,000(c)	Chicago Board of Education, Series D, 5.00%, 12/1/46	11,419,802
20,000,000(c)	Chicago Board of Education, Series D, 5.00%, 12/1/46	19,464,200
2,095,000(c)	Chicago Board of Education, Series H, 5.00%, 12/1/46	1,983,022
4,050,000	City of Plano Special Service Area No. 3 & No. 4, 4.00%, 3/1/35	4,051,904
4,050,000(d)	Illinois Finance Authority, Series 2, 6.00%, 11/15/36	3,240,000
1,591,212(b)	Illinois Finance Authority, Cabs Clare Oaks Project, Series B1, 11/15/52	111,385
2,520,597(d)(e)	Illinois Finance Authority, Clare Oaks Project, Series 3, 4.00%, 11/15/52	1,764,418
12,160,000	Southwestern Illinois Development Authority, 5.00%, 6/1/53	11,204,832
1,415,000(d)	Southwestern Illinois Development Authority, Village of Sauget Project, 5.625%, 11/1/26	1,061,250
3,040,000	Village of Lincolnwood, Series A, 4.82%, 1/1/41 (144A)	2,726,394

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

20Pioneer High Income Municipal Portfolio | Annual Report | 8/31/23

Principal Amount USD ($)		Value
	Illinois — (continued)
2,165,000	Village of Matteson, 6.50%, 12/1/35	$    2,204,316
1,639,000	Village of Volo IL Special Service Area No. 17, 5.50%, 3/1/47	1,582,684
	Total Illinois	$ 95,356,681
	Indiana — 7.8%
8,230,000	City of Anderson, 5.375%, 1/1/40 (144A)	$    6,670,744
580,000	City of Evansville, Silver Birch Evansville Project, 4.80%, 1/1/28	555,048
6,475,000	City of Evansville, Silver Birch Evansville Project, 5.45%, 1/1/38	5,346,796
600,000	City of Fort Wayne, 5.125%, 1/1/32	528,840
4,665,000	City of Fort Wayne, 5.35%, 1/1/38	3,786,301
24,990,000	City of Hammond, Custodial Receipts Cabelas Project, 7.50%, 2/1/29 (144A)	24,029,634
1,025,000	City of Kokomo, Silver Birch of Kokomo, 5.75%, 1/1/34	976,835
7,825,000	City of Kokomo, Silver Birch of Kokomo, 5.875%, 1/1/37	7,214,885
1,075,000	City of Lafayette, Glasswater Creek Lafayette Project, 5.60%, 1/1/33	1,053,629
6,000,000	City of Lafayette, Glasswater Creek Lafayette Project, 5.80%, 1/1/37	5,893,860
800,000	City of Mishawaka, Silver Birch Mishawaka Project, 5.10%, 1/1/32 (144A)	747,808
5,890,000	City of Mishawaka, Silver Birch Mishawaka Project, 5.375%, 1/1/38 (144A)	4,793,341
4,560,000	City of Terre Haute, 5.35%, 1/1/38	3,644,170
5,190,000	Indiana Finance Authority, Multipurpose Educational Facilities, Avondale Meadows Academy Project, 5.125%, 7/1/37	5,132,183
2,830,000	Indiana Finance Authority, Multipurpose Educational Facilities, Avondale Meadows Academy Project, 5.375%, 7/1/47	2,621,627
1,975,000	Indiana Finance Authority, Sanders Glen Project, Series A, 4.25%, 7/1/43	1,636,189
2,020,000	Indiana Finance Authority, Sanders Glen Project, Series A, 4.50%, 7/1/53	1,648,482
11,985,000	Indiana Housing & Community Development Authority, Series A, 5.00%, 1/1/39 (144A)	9,212,510

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

Pioneer High Income Municipal Portfolio | Annual Report | 8/31/2321

Schedule of Investments  |  8/31/23 (continued)

Principal Amount USD ($)		Value
	Indiana — (continued)
8,340,000	Indiana Housing & Community Development Authority, Evergreen Village Bloomington Project, 5.50%, 1/1/37	$    7,206,594
10,220,000	Town of Plainfield Multifamily Housing Revenue, 5.375%, 9/1/38	9,707,876
	Total Indiana	$ 102,407,352
	Kansas — 1.0%
400,000	Kansas Development Finance Authority, Series A, 5.25%, 11/15/33	$       353,888
15,405,000	Kansas Development Finance Authority, Series A, 5.25%, 11/15/53	11,302,186
2,500,000	Kansas Development Finance Authority, Series A, 5.50%, 11/15/38	2,080,750
	Total Kansas	$ 13,736,824
	Maryland — 0.1%
900,000	Maryland Health & Higher Educational Facilities Authority, City Neighbors, Series A, 6.75%, 7/1/44	$       902,178
	Total Maryland	$ 902,178
	Massachusetts — 1.3%
7,790,000	Massachusetts Development Finance Agency, Series A, 5.00%, 7/1/44	$    7,370,976
635,502(d)	Massachusetts Development Finance Agency, Adventcare Project, 7.625%, 10/15/37	64
1,661,444(d)	Massachusetts Development Finance Agency, Adventcare Project, Series A, 6.75%, 10/15/37 (144A)	166
1,250,000	Massachusetts Development Finance Agency, International Charter School, 5.00%, 4/15/40	1,257,637
4,500,000	Massachusetts Development Finance Agency, Linden Ponds, 5.125%, 11/15/46 (144A)	4,506,345
4,000,000	Massachusetts Development Finance Agency, Lowell General Hospital, Series G, 5.00%, 7/1/44	3,717,400
	Total Massachusetts	$ 16,852,588
	Michigan — 2.3%
8,490,000	David Ellis Academy-West, 5.25%, 6/1/45	$    7,532,073
1,250,000	Flint Hospital Building Authority, Hurley Medical Center, Series A, 5.25%, 7/1/39	1,221,100
5,485,000	Flint International Academy, 5.75%, 10/1/37	5,485,000
5,720,000	Michigan Finance Authority, 5.75%, 4/1/40	5,816,039

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

22Pioneer High Income Municipal Portfolio | Annual Report | 8/31/23

Principal Amount USD ($)		Value
	Michigan — (continued)
4,000,000(e)	Michigan Strategic Fund, Series B, 7.50%, 11/1/41	$    4,096,280
7,100,000(e)	Michigan Strategic Fund, Michigan Department Offices Lease, Series B, 7.75%, 3/1/40	6,130,211
	Total Michigan	$ 30,280,703
	Minnesota — 2.1%
1,310,000	City of Bethel, 6.00%, 7/1/57	$    1,143,460
4,210,000	City of Bethel, Series A, 5.00%, 7/1/48	3,828,785
1,000,000	City of Bethel, Series A, 5.00%, 7/1/53	875,890
2,440,000	City of Brooklyn Park, Prairie Seeds Academy Project, Series A, 5.00%, 3/1/34	2,300,359
2,000,000	City of Brooklyn Park, Prairie Seeds Academy Project, Series A, 5.00%, 3/1/39	1,713,420
3,515,000	City of Deephaven, Eagle Ridge Academy Project, Series A, 5.00%, 7/1/55	3,587,971
400,000	City of Deephaven, Eagle Ridge Academy Project, Series A, 5.25%, 7/1/37	389,564
1,500,000	City of Deephaven, Eagle Ridge Academy Project, Series A, 5.50%, 7/1/50	1,449,450
1,500,000(d)	City of Rochester, Rochester Math & Science Academy, Series A, 5.125%, 9/1/38	1,398,915
3,145,000(d)	City of Rochester, Rochester Math & Science Academy, Series A, 5.25%, 9/1/43	2,645,448
6,080,000(d)	City of Rochester, Rochester Math & Science Academy, Series A, 5.375%, 9/1/50	4,932,582
2,000,000	Housing & Redevelopment Authority of The City of St. Paul Minnesota, Great River School Project, Series A, 5.50%, 7/1/52 (144A)	2,051,160
1,300,000	Housing & Redevelopment Authority of The City of St. Paul Minnesota, St. Paul City School Project, Series A, 5.00%, 7/1/36	1,362,959
	Total Minnesota	$ 27,679,963
	Missouri — 0.2%
200,000	Kansas City Industrial Development Authority, Series A, 4.25%, 4/1/26 (144A)	$       194,126
1,000,000	Kansas City Industrial Development Authority, Series A, 5.00%, 4/1/36 (144A)	910,520
2,300,000	Kansas City Industrial Development Authority, Series A, 5.00%, 4/1/46 (144A)	1,949,457
	Total Missouri	$ 3,054,103

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

Pioneer High Income Municipal Portfolio | Annual Report | 8/31/2323

Schedule of Investments  |  8/31/23 (continued)

Principal Amount USD ($)		Value
	Nevada — 0.1%
1,135,000	City of Las Vegas Special Improvement District No 611, Sunstone Phase I and II, 4.125%, 6/1/50	$       903,074
	Total Nevada	$ 903,074
	New Jersey — 0.8%
1,255,000	New Jersey Economic Development Authority, Series A, 5.25%, 10/1/38 (144A)	$    1,140,908
1,215,000	New Jersey Economic Development Authority, Charter Hatikvah International Academy, Series A, 5.25%, 7/1/37 (144A)	1,116,524
2,500,000	New Jersey Economic Development Authority, Charter Hatikvah International Academy, Series A, 5.375%, 7/1/47 (144A)	2,204,650
7,205,000	New Jersey Economic Development Authority, Marion P. Thomas Charter School, Inc., Project, Series A, 5.375%, 10/1/50 (144A)	6,287,732
	Total New Jersey	$ 10,749,814
	New Mexico — 1.3%
16,135,000(e)	County of Otero, Otero County Jail Project, Certificate Participation, 9.00%, 4/1/28	$   15,650,950
1,750,000	Lower Petroglyphs Public Improvement District, 5.00%, 10/1/48	1,558,515
	Total New Mexico	$ 17,209,465
	New York — 16.3%
375,000(d)	Buffalo & Erie County Industrial Land Development Corp., 5.00%, 10/1/28 (144A)	$       382,226
4,150,000(d)	Buffalo & Erie County Industrial Land Development Corp., 5.00%, 10/1/38 (144A)	4,089,991
6,175,000	Chautauqua Tobacco Asset Securitization Corp., 5.00%, 6/1/48	5,659,696
9,250,000	Dutchess County Local Development Corp., Health Quest Systems Inc., Series B, 5.00%, 7/1/46	8,903,125
10,000,000(d)	Erie County Industrial Development Agency, Galvstar LLC Project, Series A, 9.25%, 10/1/30	1,250,000
8,000,000(d)	Erie County Industrial Development Agency, Galvstar LLC Project, Series B, 9.25%, 10/1/30	1,890,000
1,795,000(d)	Erie County Industrial Development Agency, Galvstar LLC Project, Series C, 9.25%, 10/1/30	424,069
8,755,000	Erie Tobacco Asset Securitization Corp., Asset-Backed, Series A, 5.00%, 6/1/45	7,997,780
22,015,000	Nassau County Tobacco Settlement Corp., Asset-Backed, Series A-3, 5.00%, 6/1/35	20,264,367
15,020,000	Nassau County Tobacco Settlement Corp., Asset-Backed, Series A-3, 5.125%, 6/1/46	13,612,476

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

24Pioneer High Income Municipal Portfolio | Annual Report | 8/31/23

Principal Amount USD ($)		Value
	New York — (continued)
6,735,000	New York Counties Tobacco Trust IV, Series A, 5.00%, 6/1/42	$    6,256,276
20,700,000	New York Counties Tobacco Trust IV, Series A, 6.25%, 6/1/41 (144A)	20,700,000
32,420,000	New York Counties Tobacco Trust IV, Settlement pass through, Series A, 5.00%, 6/1/45	29,734,003
51,600,000(b)	New York Counties Tobacco Trust V, Capital Appreciation Pass Through, Series S-4A, 6/1/60 (144A)	2,307,552
440,000	New York Counties Tobacco Trust VI, Series A-2B, 5.00%, 6/1/45	411,167
18,745,000	New York Counties Tobacco Trust VI, Settlement pass through, Series A-2B, 5.00%, 6/1/51	17,072,009
2,625,000	Riverhead Industrial Development Agency, 7.65%, 8/1/34	2,626,654
2,250,000	TSASC, Inc., Series B, 5.00%, 6/1/25	2,285,595
26,890,000	TSASC, Inc., Series B, 5.00%, 6/1/45	25,467,519
29,980,000	TSASC, Inc., Series B, 5.00%, 6/1/48	28,066,676
14,000,000	Westchester County Local Development Corp., Purchase Senior Learning Community, Inc. Project, 4.50%, 7/1/56 (144A)	9,500,120
5,000,000	Westchester County Local Development Corp., Purchase Senior Learning Community, Inc. Project, 5.00%, 7/1/36 (144A)	4,420,800
	Total New York	$ 213,322,101
	Ohio — 4.2%
50,200,000	Buckeye Tobacco Settlement Financing Authority, Senior Class 2, Series B2, 5.00%, 6/1/55	$   45,887,318
3,000,000	County of Muskingum, Genesis Healthcare System Project , 5.00%, 2/15/44	2,719,650
2,250,000	County of Muskingum, Genesis Healthcare System Project , 5.00%, 2/15/48	1,959,030
980,000	Ohio Housing Finance Agency, Sanctuary Springboro Project, 5.125%, 1/1/32 (144A)	828,776
5,275,000	Ohio Housing Finance Agency, Sanctuary Springboro Project, 5.45%, 1/1/38 (144A)	4,145,464
	Total Ohio	$ 55,540,238
	Pennsylvania — 4.7%
1,000,000	Chester County Industrial Development Authority, Collegium Charter School, Series A, 5.125%, 10/15/37	$       976,510
2,535,000	Chester County Industrial Development Authority, Collegium Charter School, Series A, 5.25%, 10/15/47	2,268,267

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

Pioneer High Income Municipal Portfolio | Annual Report | 8/31/2325

Schedule of Investments  |  8/31/23 (continued)

Principal Amount USD ($)		Value
	Pennsylvania — (continued)
8,465,000	Delaware County Industrial Development Authority, Chester Charter School Arts Project, Series A, 5.125%, 6/1/46 (144A)	$    8,709,384
1,205,000	Philadelphia Authority for Industrial Development, 5.00%, 4/15/32 (144A)	1,210,543
2,290,000	Philadelphia Authority for Industrial Development, 5.00%, 4/15/42 (144A)	2,135,471
3,335,000	Philadelphia Authority for Industrial Development, 5.00%, 4/15/52 (144A)	2,913,523
1,660,000	Philadelphia Authority for Industrial Development, 5.125%, 6/1/38 (144A)	1,679,173
3,500,000	Philadelphia Authority for Industrial Development, 5.25%, 6/1/48 (144A)	3,451,560
4,370,000	Philadelphia Authority for Industrial Development, 5.375%, 6/1/53 (144A)	4,261,493
9,435,000	Philadelphia Authority for Industrial Development, 5.50%, 6/1/49 (144A)	9,550,201
925,000	Philadelphia Authority for Industrial Development, Series A, 5.00%, 11/15/31	906,740
4,055,000	Philadelphia Authority for Industrial Development, 2800 American Street Co. Project, Series A, 5.625%, 7/1/48 (144A)	3,961,613
8,295,000	Philadelphia Authority for Industrial Development, Global Leadership Academy Charter School Project, Series A, 5.00%, 11/15/50	7,121,175
2,200,000	Philadelphia Authority for Industrial Development, Greater Philadelphia Health Action, Inc. Project, Series A, 6.50%, 6/1/45	2,070,574
2,940,000	Philadelphia Authority for Industrial Development, Greater Philadelphia Health Action, Inc., Project, Series A, 6.625%, 6/1/50	2,785,797
255,000	Philadelphia Authority for Industrial Development, Green Woods Charter School, Series A, 5.00%, 6/15/32	250,456
1,045,000	Philadelphia Authority for Industrial Development, Green Woods Charter School, Series A, 5.125%, 6/15/42	964,901
970,000	Philadelphia Authority for Industrial Development, Green Woods Charter School, Series A, 5.25%, 6/15/52	842,998
1,020,000	Philadelphia Authority for Industrial Development, Green Woods Charter School, Series A, 5.375%, 6/15/57	881,933
2,000,000	Philadelphia Authority for Industrial Development, Tacony Academy Charter school Project, 5.00%, 6/15/33 (144A)	1,973,740

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

26Pioneer High Income Municipal Portfolio | Annual Report | 8/31/23

Principal Amount USD ($)		Value
	Pennsylvania — (continued)
1,500,000	Philadelphia Authority for Industrial Development, Tacony Academy Charter school Project, 5.375%, 6/15/38 (144A)	$    1,449,015
1,750,000	Philadelphia Authority for Industrial Development, Tacony Academy Charter school Project, 5.50%, 6/15/43 (144A)	1,673,245
	Total Pennsylvania	$ 62,038,312
	Puerto Rico — 2.5%
10,689,000(c)	Commonwealth of Puerto Rico, Series A1, 4.00%, 7/1/46	$    8,861,074
5,745,000	Puerto Rico Commonwealth Aqueduct & Sewer Authority, Series A, 5.00%, 7/1/47 (144A)	5,497,850
6,685,000	Puerto Rico Electric Power Authority, Series AAA, 5.25%, 7/1/24	1,704,675
3,535,000	Puerto Rico Electric Power Authority, Series CCC, 4.80%, 7/1/28	901,425
1,285,000	Puerto Rico Electric Power Authority, Series CCC, 5.00%, 7/1/24	327,675
3,735,000	Puerto Rico Electric Power Authority, Series DDD, 5.00%, 7/1/24	952,425
3,315,000	Puerto Rico Electric Power Authority, Series TT, 5.00%, 7/1/24	845,325
1,000,000	Puerto Rico Electric Power Authority, Series WW, 5.00%, 7/1/28	255,000
1,130,000	Puerto Rico Electric Power Authority, Series ZZ, 4.75%, 7/1/27	288,150
9,310,000	Puerto Rico Highway & Transportation Authority, Series A, 5.00%, 7/1/62	9,158,713
4,000,000	Puerto Rico Highway & Transportation Authority, Series A, 5.85%, 3/1/27	4,008,000
665,000	Puerto Rico Industrial Tourist Educational Medical & Environmental Control Facilities Financing Authority, Series A, 5.20%, 7/1/24	669,575
	Total Puerto Rico	$ 33,469,887
	Rhode Island — 0.2%
2,065,000(d)	Central Falls Detention Facility Corp., 7.25%, 7/15/35	$       371,700
2,000,000(e)	Tender Option Bond Trust Receipts/Certificates, RIB, Series 2019, 3.078%, 9/1/47 (144A)	1,712,120
	Total Rhode Island	$ 2,083,820

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

Pioneer High Income Municipal Portfolio | Annual Report | 8/31/2327

Schedule of Investments  |  8/31/23 (continued)

Principal Amount USD ($)		Value
	Tennessee — 0.1%
1,095,000	Metropolitan Government Nashville & Davidson County Industrial Development Board, 4.00%, 6/1/51 (144A)	$       856,575
	Total Tennessee	$ 856,575
	Texas — 4.7%
325,000	Arlington Higher Education Finance Corp., 3.50%, 3/1/24 (144A)	$       322,670
16,875,000	Arlington Higher Education Finance Corp., 5.45%, 3/1/49 (144A)	17,347,331
100,000	Arlington Higher Education Finance Corp., Series A, 5.875%, 3/1/24	100,279
525,000	Arlington Higher Education Finance Corp., Series A, 6.625%, 3/1/29	531,048
375,000	Arlington Higher Education Finance Corp., Universal Academy, Series A, 7.00%, 3/1/34	377,993
7,030,000	Arlington Higher Education Finance Corp., Universal Academy, Series A, 7.125%, 3/1/44	6,744,582
160,000	City of Celina, 5.50%, 9/1/24	160,390
990,000	City of Celina, 6.00%, 9/1/30	994,742
2,520,000	City of Celina, 6.25%, 9/1/40	2,544,268
16,755,000(e)	Greater Texas Cultural Education Facilities Finance Corp., 9.00%, 2/1/50 (144A)	14,951,324
3,335,000(e)	Greater Texas Cultural Education Facilities Finance Corp., Series B, 9.00%, 2/1/33 (144A)	3,292,179
100,000(f)	La Vernia Higher Education Finance Corp., Meridian World School, Series A, 5.25%, 8/15/35 (144A)	101,100
2,000,000(f)	La Vernia Higher Education Finance Corp., Meridian World School, Series A, 5.50%, 8/15/45 (144A)	2,026,580
1,250,000(d)	New Hope Cultural Education Facilities Finance Corp., Village On The Park, Series C, 5.50%, 7/1/46	562,500
1,000,000(d)	New Hope Cultural Education Facilities Finance Corp., Village On The Park, Series C, 5.75%, 7/1/51	450,000
75,000(d)	New Hope Cultural Education Facilities Finance Corp., Village On The Park, Series D, 6.00%, 7/1/26	30,000
1,350,000(d)	New Hope Cultural Education Facilities Finance Corp., Village On The Park, Series D, 7.00%, 7/1/51	540,000
17,350,000(d)	Sanger Industrial Development Corp., Texas Pellets Project, Series B, 8.00%, 7/1/38	4,272,437

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

28Pioneer High Income Municipal Portfolio | Annual Report | 8/31/23

Principal Amount USD ($)		Value
	Texas — (continued)
8,142,447(d)	Tarrant County Cultural Education Facilities Finance Corp., Series A, 5.75%, 12/1/54	$    5,292,591
1,000,000(e)	Texas Midwest Public Facility Corp., Secure Treatment Facility Project, Restructured, 0.01%, 12/1/30	676,930
	Total Texas	$ 61,318,944
	Virginia — 5.2%
4,285,000	Cherry Hill Community Development Authority, Potomac Shores Project, 5.40%, 3/1/45 (144A)	$    4,141,453
17,925,000	Tobacco Settlement Financing Corp., Series 1, 6.706%, 6/1/46	15,325,875
41,495,000	Tobacco Settlement Financing Corp., Series B1, 5.00%, 6/1/47	37,897,383
5,905,000(e)	Tobacco Settlement Financing Corp., Series B2, 5.20%, 6/1/46	5,676,358
14,000,000(b)	Tobacco Settlement Financing Corp., Series D, 6/1/47	3,569,440
2,000,000	Virginia Small Business Financing Authority, Transform 66-P3 Project, 5.00%, 12/31/52	1,961,640
	Total Virginia	$ 68,572,149
	Wisconsin — 3.3%
2,500,000	Public Finance Authority, American Preparatory Academy - Las Vegas Project, Series A, 5.125%, 7/15/37 (144A)	$    2,408,250
1,550,000	Public Finance Authority, Community School of Davidson Project, 5.00%, 10/1/33	1,534,872
5,905,000	Public Finance Authority, Community School of Davidson Project, 5.00%, 10/1/48	5,363,511
1,590,000	Public Finance Authority, Coral Academy Science Las Vegas, Series A, 5.625%, 7/1/44	1,610,288
370,000	Public Finance Authority, Coral Academy Science Reno, 5.00%, 6/1/29 (144A)	363,407
1,710,000	Public Finance Authority, Coral Academy Science Reno, 5.00%, 6/1/39 (144A)	1,564,257
2,660,000	Public Finance Authority, Coral Academy Science Reno, 5.00%, 6/1/50 (144A)	2,251,105
400,000	Public Finance Authority, Coral Academy Science Reno, Series A, 4.00%, 6/1/36 (144A)	349,588
700,000	Public Finance Authority, Coral Academy Science Reno, Series A, 4.00%, 6/1/51 (144A)	484,169
2,280,000	Public Finance Authority, Coral Academy Science Reno, Series A, 4.00%, 6/1/61 (144A)	1,441,097
335,000	Public Finance Authority, Coral Academy Science Reno, Series A, 5.375%, 6/1/37 (144A)	315,406

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

Pioneer High Income Municipal Portfolio | Annual Report | 8/31/2329

Schedule of Investments  |  8/31/23 (continued)

Principal Amount USD ($)		Value
	Wisconsin — (continued)
900,000	Public Finance Authority, Coral Academy Science Reno, Series A, 5.875%, 6/1/52 (144A)	$       829,089
1,565,000	Public Finance Authority, Coral Academy Science Reno, Series A, 6.00%, 6/1/62 (144A)	1,423,727
9,310,000	Public Finance Authority, Gardner Webb University, 5.00%, 7/1/31 (144A)	9,628,402
225,000	Public Finance Authority, Lead Academy Project, Series A, 4.25%, 8/1/26 (144A)	221,371
2,000,000	Public Finance Authority, Lead Academy Project, Series A, 5.00%, 8/1/36 (144A)	2,047,740
2,500,000	Public Finance Authority, Lead Academy Project, Series A, 5.125%, 8/1/46 (144A)	2,519,025
230,000	Public Finance Authority, Quality Education Academy Project, Series A, 5.25%, 7/15/33 (144A)	224,866
690,000	Public Finance Authority, Quality Education Academy Project, Series A, 6.00%, 7/15/43 (144A)	669,272
640,000	Public Finance Authority, Quality Education Academy Project, Series A, 6.25%, 7/15/53 (144A)	621,741
1,175,000	Public Finance Authority, Quality Education Academy Project, Series A, 6.50%, 7/15/63 (144A)	1,144,650
2,000,000	Public Finance Authority, Searstone CCRC Project, 4.00%, 6/1/41 (144A)	1,455,520
1,500,000	Public Finance Authority, SearStone CCRC Project, Series A, 5.00%, 6/1/37 (144A)	1,353,795
2,500,000	Public Finance Authority, SearStone CCRC Project, Series A, 5.00%, 6/1/52 (144A)	1,919,200
10,640,000(b)(d)	Public Finance Authority, Springshire Pre Development Project, 9/30/23 (144A)	1,064,000
	Total Wisconsin	$ 42,808,348
	Total Municipal Bonds (Cost $1,422,941,413)	$1,257,992,563

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

30Pioneer High Income Municipal Portfolio | Annual Report | 8/31/23

Principal Amount USD ($)		Value
	Debtors in Possession Financing — 0.7% of Net Assets#
	Retirement Housing — 0.7%
9,000,000 +^	Springshire Retirement LLC - Promissory Note, 9.00%, 9/30/23	$     9,000,000
	Total Retirement Housing	$ 9,000,000
	TOTAL DEBTORS IN POSSESSION FINANCING (Cost $9,000,000)	$ 9,000,000
	TOTAL INVESTMENTS IN UNAFFILIATED ISSUERS — 96.5% (Cost $1,431,941,413)	$1,266,992,563
	OTHER ASSETS AND LIABILITIES — 3.5%	$ 45,797,123
	net assets — 100.0%	$1,312,789,686

AGM	Assured Guaranty Municipal Corp.
RIB	Residual Interest Bond is purchased in a secondary market. The interest rate is subject to change periodically and inversely based upon prevailing market rates. The interest rate shown is the rate at August 31, 2023.
(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 August 31, 2023, the value of these securities amounted to $395,310,595, or 30.1% of net assets.

(a)	Consists of Revenue Bonds unless otherwise indicated.
(b)	Security issued with a zero coupon. Income is recognized through accretion of discount.
(c)	Represents a General Obligation Bond.
(d)	Security is in default.
(e)	The interest rate is subject to change periodically. The interest rate and/or reference index and spread shown at August 31, 2023.
(f)	Pre-refunded bonds have been collateralized by U.S. Treasury or U.S. Government Agency securities which are held in escrow to pay interest and principal on the tax exempt issue and to retire the bonds in full at the earliest refunding date.
+	Security is valued using significant unobservable inputs (Level 3).
^	Security is valued using fair value methods (other than prices supplied by independent pricing services or broker dealers).
#	Securities are restricted as to resale.

Restricted Securities	Acquisition date	Cost	Value
Springshire Retirement LLC - Promissory Note	12/1/2021	$9,000,000	$9,000,000
% of Net assets			0.7%

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

Pioneer High Income Municipal Portfolio | Annual Report | 8/31/2331

Schedule of Investments  |  8/31/23 (continued)

The concentration of investments as a percentage of total investments by type of obligation/market sector is as follows:

Revenue Bonds:
Tobacco Revenue	26.6%
Health Revenue	22.7
Education Revenue	22.2
Development Revenue	11.0
Water Revenue	2.4
Facilities Revenue	1.8
Transportation Revenue	1.5
Other Revenue	1.0
Power Revenue	0.4
Industrial Revenue	0.3
Utilities Revenue	0.1
Pollution Control Revenue	0.1
	90.1%
General Obligation Bonds:	9.9%
	100.0%

Purchases and sales of securities (excluding short-term investments) for the year ended August 31, 2023, aggregated $524,328,731 and $742,804,804, respectively.

Various inputs are used in determining the value of the Portfolio'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.).
Level 3	–	significant unobservable inputs (including the Adviser's own assumptions in determining fair value of investments).

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

	Level 1	Level 2	Level 3	Total
Municipal Bonds	$—	$1,257,992,563	$ —	$1,257,992,563
Debtors in Possession Financing	—	—	9,000,000	9,000,000
Total Investments in Securities	$ —	$ 1,257,992,563	$ 9,000,000	$ 1,266,992,563

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

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

32Pioneer High Income Municipal Portfolio | Annual Report | 8/31/23

Statement of Assets and Liabilities  |  8/31/23

ASSETS:
Investments in unaffiliated issuers, at value (cost $1,431,941,413)	$1,266,992,563
Cash	12,678,346
Receivables —
Investment securities sold	6,290,783
Proceeds from contributions	6,362,186
Interest	25,048,197
Other assets	311,500
Total assets	$1,317,683,575
LIABILITIES:
Payables —
Value of withdrawals	$ 4,713,325
Trustees' fees	15,069
Administrative expenses	55,346
Accrued expenses	110,149
Total liabilities	$ 4,893,889
NET ASSETS:
Paid-in capital	$1,375,943,097
Distributable earnings (loss)	(63,153,411)
Net assets	$1,312,789,686

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

Pioneer High Income Municipal Portfolio | Annual Report | 8/31/23 33

Statement of OperationsFOR THE YEAR ENDED 8/31/23

INVESTMENT INCOME:
Interest from unaffiliated issuers	$77,535,278
Total Investment Income		$ 77,535,278
EXPENSES:
Administrative expenses	$ 91,966
Transfer agent fees	1,599
Custodian fees	17,480
Professional fees	151,377
Printing expense	3,530
Officers' and Trustees' fees	85,651
Miscellaneous	2,119
Total expenses		$ 353,722
Net investment income		$ 77,181,556
REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS:
Net realized gain (loss) on:
Investments in unaffiliated issuers		$ (71,900,401)
Change in net unrealized appreciation (depreciation) on:
Investments in unaffiliated issuers		$ (49,144,124)
Net realized and unrealized gain (loss) on investments		$(121,044,525)
Net decrease in net assets resulting from operations		$ (43,862,969)

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

34Pioneer High Income Municipal Portfolio | Annual Report | 8/31/23

Statements of Changes in Net Assets

	Year Ended 8/31/23	Year Ended 8/31/22
FROM OPERATIONS:
Net investment income (loss)	$ 77,181,556	$ 84,276,467
Net realized gain (loss) on investments	(71,900,401)	(49,557,811)
Change in net unrealized appreciation (depreciation) on investments	(49,144,124)	(223,692,236)
Net decrease in net assets resulting from operations	$ (43,862,969)	$ (188,973,580)
FROM CAPITAL TRANSACTIONS:
Proceeds from contributions	$ 514,947,243	$ 821,599,552
Value of withdrawals	(777,581,636)	(1,068,188,723)
Net decrease in net assets resulting from capital transactions	$ (262,634,393)	$ (246,589,171)
Net decrease in net assets	$ (306,497,362)	$ (435,562,751)
NET ASSETS:
Beginning of year	$1,619,287,048	$ 2,054,849,799
End of year	$1,312,789,686	$ 1,619,287,048

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

Pioneer High Income Municipal Portfolio | Annual Report | 8/31/2335

Financial Highlights

	Year Ended 8/31/23	Year Ended 8/31/22	12/21/20 to 8/31/21*
Total return	(2.71)%	(9.34)%	6.30%(a)
Ratio of net expenses to average net assets	0.02%	0.02%	0.02%(b)
Ratio of net investment income (loss) to average net assets	5.35%	4.47%	3.07%(b)
Portfolio turnover rate	37%	38%	11%(a)(c)
Net assets, end of period (in thousands)	$1,312,790	$1,619,287	$2,054,850

*	The Portfolio commenced operations on December 21, 2020.
(a)	Not annualized.
(b)	Annualized.
(c)	The portfolio turnover rate excludes purchases and sales from the transfer of assets from Pioneer High Income Municipal Fund (see note 1).

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

36Pioneer High Income Municipal Portfolio | Annual Report | 8/31/23

Notes to Financial Statements  |  8/31/23

1. Organization and Significant Accounting Policies

Pioneer High Income Municipal Portfolio (the “Portfolio”) is a diversified series of Pioneer Core Trust I (the “Trust”), an open-end management investment company established as a Delaware statutory trust on October 14, 2020. The Portfolio 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 Portfolio is to maximize total return through a combination of income that is exempt from regular federal income tax and capital appreciation.

The Declaration of Trust permits the Trustees to issue beneficial interests in the Portfolio. At August 31, 2023, all investors in the Portfolio were funds advised by the investment adviser of the Portfolio. At August 31, 2023, Pioneer High Income Municipal Fund owned approximately 99.999% of the Portfolio and Pioneer MAP - High Income Municipal Fund owned approximately 0.001% of the Portfolio. On December 21, 2020, the Pioneer High Income Municipal Fund transferred all of its investable assets, with a cost basis of $1,707,664,760 and a value of $1,760,998,235, to the Portfolio in exchange for an interest in the Portfolio. The transaction was structured to qualify as a tax-free exchange of assets.

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

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 Portfolio’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 Portfolio is required to comply with Rule 18f-4 under the 1940 Act, which governs the use of derivatives by registered investment companies.

Pioneer High Income Municipal Portfolio | Annual Report | 8/31/2337

Rule 18f-4 permits portfolios 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 portfolio, to establish and maintain a comprehensive derivatives risk management program, appoint a derivatives risk manager and comply with a relative or absolute limit on portfolio leverage risk calculated based on value-at-risk (“VaR”), unless the portfolio uses derivatives in only a limited manner (a "limited derivatives user"). The Portfolio is currently a limited derivatives user for purposes of Rule 18f-4.

The Portfolio 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 Portfolio 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 Portfolio in the preparation of its financial statements:

A.	Security Valuation
	Investments are stated at value, 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.
	Securities 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

38Pioneer High Income Municipal Portfolio | Annual Report | 8/31/23

	fair valuation team comprised of certain personnel of the Adviser. The Adviser is designated as the valuation designee for the Portfolio 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 Portfolio’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 Portfolio’s securities may differ significantly from exchange prices, and such differences could be material.
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.
	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.
	The Portfolio makes a daily allocation of its net investment income and realized and unrealized gains and losses from securities to its investors in proportion to their investment in the Portfolio.
C.	Federal Income Taxes
	The Portfolio is classified as a partnership for federal income tax purposes. As such, each investor in the Portfolio is treated as the owner of its proportionate share of the net assets, income, expenses and realized and unrealized gains and losses of the Portfolio. Therefore, no federal income tax provision is required. It is intended that the Portfolio’s assets will be managed so an investor in the Portfolio can satisfy the requirements of Subchapter M of the Internal Revenue Code.

Pioneer High Income Municipal Portfolio | Annual Report | 8/31/2339

	Management has analyzed the Portfolio’s tax positions taken on income tax returns for all open tax years and has concluded no provision for income tax is required in the Portfolio’s financial statements. The Portfolio’s federal and state income and federal excise tax returns for tax years for which the applicable statutes of limitations have not expired are subject to examination by the Internal Revenue Service and state departments of revenue.
D.	Risks
	The value of securities held by the Portfolio 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 Portfolio's investments and negatively impact the Portfolio'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.

40Pioneer High Income Municipal Portfolio | Annual Report | 8/31/23

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 Portfolio's assets may go down.

At times, the Portfolio’s investments may represent industries or industry sectors that are interrelated or have common risks, making the Portfolio more susceptible to any economic, political, or regulatory developments or other risks affecting those industries and sectors.

Normally, the Portfolio invests at least 80% of its net assets (plus the amount of borrowings, if any, for investment purposes) in debt securities and other obligations issued by or on behalf of states, counties, municipalities, territories and possessions of the United States and the District of Columbia and their authorities, political subdivisions, agencies and instrumentalities, the interest on which is exempt from regular federal income tax ("municipal securities").

The municipal bond market can be susceptible to unusual volatility, particularly for lower-rated and unrated securities. Liquidity can be reduced unpredictably in response to overall economic conditions or credit tightening. Municipal issuers may be adversely affected by rising health care costs, increasing unfunded pension liabilities, and by the phasing out of federal programs providing financial support. Unfavorable conditions and developments relating to projects financed with municipal securities can result in lower revenues to issuers of municipal securities, potentially resulting in defaults. Issuers often depend on revenues from these projects to make principal and interest payments. The value of municipal securities can also be adversely affected by changes in the financial condition of one or more individual municipal issuers or insurers of municipal issuers, regulatory and political developments, tax law changes or other legislative actions, and by uncertainties and public perceptions concerning these and other factors. Municipal securities may be more susceptible to downgrades or defaults during recessions or similar periods of economic stress. Financial

Pioneer High Income Municipal Portfolio | Annual Report | 8/31/2341

difficulties of municipal issuers may continue or get worse, particularly in the event of political, economic or market turmoil or a recession. To the extent the Portfolio invests significantly in a single state (including California, Illinois, New York and Indiana), city, territory (including Puerto Rico), or region, or in securities the payments on which are dependent upon a single project or source of revenues, or that relate to a sector or industry, including health care facilities, education, transportation, special revenues and pollution control, the Portfolio will be more susceptible to associated risks and developments.

The Portfolio 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 market prices of the Portfolio'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 Portfolio'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 Portfolio or a counterparty to a financial contract with the Portfolio 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

42Pioneer High Income Municipal Portfolio | Annual Report | 8/31/23

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 Portfolio could be delayed or hindered in its enforcement of rights against an issuer, guarantor or counterparty.

The Portfolio’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 Portfolio'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 Portfolio's performance.

With the increased use of technologies such as the Internet to conduct business, the Portfolio is susceptible to operational, information security and related risks. While the Portfolio’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 Portfolio cannot control the cybersecurity plans and systems put in place by service providers to the Portfolio such as the Portfolio’s custodian and accounting agent, and the Portfolio’s transfer agent. In addition, many beneficial owners of Portfolio shares hold them through accounts at broker-dealers, retirement platforms and other financial market participants over which neither the Portfolio 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 Portfolio’s service providers or intermediaries have the ability to cause disruptions and impact business operations, potentially resulting in financial losses, interference with the Portfolio’s ability to calculate its net asset value, impediments to trading, the inability of investors in the Portfolio to purchase or withdraw interests in the Portfolio, loss of or unauthorized access to private investor information and violations of applicable privacy and

Pioneer High Income Municipal Portfolio | Annual Report | 8/31/2343

	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 Portfolio’s registration statement on Form N-1A contains unaudited information regarding the Portfolio’s principal risks. Please refer to that document when considering the Portfolio’s principal risks.
E.	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 Portfolio at August 31, 2023 are listed in the Schedule of Investments.

2. Management Agreement

The Adviser manages the Portfolio's portfolio. The Portfolio does not pay a management fee under the Portfolio's investment advisory agreement with the Adviser.

3. Compensation of Officers and Trustees

The Portfolio pays an annual fee to its Trustees. The Adviser reimburses the Portfolio for fees paid to the Interested Trustees. Except for the chief compliance officer, the Portfolio does not pay any salary or other compensation to its officers. The Portfolio pays a portion of the chief compliance officer's compensation for his services as the Portfolio's chief compliance officer. Amundi US pays the remaining portion of the chief compliance officer's compensation. For the year ended August 31, 2023, the Portfolio paid $85,651 in Officers' and Trustees’ compensation, which is reflected on the Statement of Operations as Officers' and Trustees’ fees. At August 31, 2023, on its Statement of Assets and Liabilities, the Portfolio had a payable for Trustees’ fees of $15,069 and a payable for administrative expenses of $55,346, which includes the payable for Officers' compensation.

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4. Transfer Agent

BNY Mellon Investment Servicing (US) Inc. serves as the transfer agent to the Portfolio at negotiated rates.

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Report of Independent Registered Public Accounting Firm

To the Board of Trustees of Pioneer Core Trust I and the Shareholders of Pioneer High Income Municipal Portfolio:

Opinion on the Financial Statements

We have audited the accompanying statement of assets and liabilities of Pioneer High Income Municipal Portfolio (the “Fund”) (one of the funds constituting Pioneer Core Trust I (the “Trust”)), including the schedule of investments, as of August 31, 2023, and the related statement of operations for the year then ended, the statement of changes in net assets for each of the two years in the period then ended, the financial highlights for each of the two years in the period ended August 31, 2023 and the period from December 21, 2020 (commencement of operations) through August 31, 2021 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 Core Trust I) at August 31, 2023, and 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 two years in the period ended August 31, 2023 and the period from December 21, 2020 (commencement of operations) through August 31, 2021, 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 Company in accordance with the U.S. federal securities law 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

46Pioneer High Income Municipal Portfolio | Annual Report | 8/31/23

effectiveness of the Trust’s internal control over financial reporting. Accordingly, we express no such opinion. 

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 August 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
October 30, 2023

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Statement Regarding Liquidity Risk Management Program

As required by law, the Portfolio 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 Portfolio could not meet requests to redeem its shares without significant dilution of remaining investors’ interests in the Portfolio. The Portfolio’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 Portfolio’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 Portfolio’s investment strategy and liquidity of portfolio investments during both normal and reasonably foreseeable stressed conditions. The Committee noted that the Portfolio’s investment strategy continues to be appropriate for an open-end fund, taking into account, among other things, whether and to what extent the Portfolio held less liquid and illiquid assets and the extent to which any such investments affected the Portfolio’s ability to meet redemption requests. In managing and reviewing the Portfolio’s liquidity risk, the Committee also considered the extent to which the Portfolio’s investment strategy involves a relatively concentrated portfolio or large positions in particular issuers, the extent to which the Portfolio uses borrowing for investment purposes, and the extent to which the Portfolio uses derivatives (including for hedging purposes). The Committee also reviewed the Portfolio’s short-term and long-term cash flow projections during both normal and reasonably foreseeable stressed conditions. In assessing the Portfolio’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 Portfolio’s short-term and long-term cash flow projections. The Committee also considered the Portfolio’s holdings of cash and cash equivalents, as well as borrowing

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arrangements and other funding sources, including, if applicable, the Portfolio’s participation in a credit facility, as components of the Portfolio’s ability to meet redemption requests. The Portfolio 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 Portfolio’s investments into one of four liquidity buckets. In reviewing the Portfolio’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 Portfolio would reasonably anticipate trading, would be reasonably expected to significantly affect liquidity.

The Committee reviewed the operation of the Portfolio's Highly Liquid Investment Minimum ("HLIM").  The Committee also reviewed the methodology for determining the Portfolio's HLIM.  The Committee determined that no adjustment to the Portfolio's HLIM was required.

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

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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

Placement Agent
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 Portfolio are available without charge, upon request, by calling our toll free number (1-800-225-6292). Information regarding how the Portfolio voted proxies relating to portfolio securities during the most recent 12-month period ended June 30 is publicly available to investors 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 Portfolio’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 Portfolio within the meaning of the 1940 Act are referred to as Interested Trustees. Trustees who are not interested persons of the Portfolio 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 Portfolio is 60 State Street, Boston, Massachusetts 02109.

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

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Independent Trustees 

Name, Age and Position Held With the Portfolio	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

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Independent Trustees (continued)

Name, Age and Position Held With the Portfolio	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 (79) 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)

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Name, Age and Position Held With the Portfolio	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 2006. 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)

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Independent Trustees (continued)

Name, Age and Position Held With the Portfolio	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.

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Interested Trustees 

Name, Age and Position Held With the Portfolio	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 Portfolio’s investment adviser and certain of its affiliates.

Pioneer High Income Municipal Portfolio | Annual Report | 8/31/2355

Portfolio Officers 

Name, Age and Position Held With the Portfolio	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 2006. 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 2006. 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 2006. 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

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Name, Age and Position Held With the Portfolio	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 High Income Municipal Portfolio | Annual Report | 8/31/2357

This report must be preceded or accompanied by the Portfolio's registration statement.

The Portfolio 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. Investors may view the filed Form N-PORT by visiting the Commission’s web site at https://www.sec.gov.

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

www.amundi.com/us

© 2023 Amundi Asset Management US, Inc. 32720-02-1023

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 $49,192 payable to Ernst & Young LLP for the year ended August 31, 2023 and $47,300 for the year ended August 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 $496 payable to Ernst & Young LLP for the year ended August 31, 2023 and $0 for the year ended August 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 $17,888 and $17,200 during the fiscal years ended August 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	•  Accounting research assistance •  SEC consultation, registration statements, and reporting •  Tax accrual related matters •  Implementation of new accounting standards •  Compliance letters (e.g. rating agency letters) •  Regulatory reviews and assistance regarding financial matters •  Semi-annual reviews (if requested) •  Comfort letters for closed end offerings
II. AUDIT-RELATED SERVICES	Services which are not prohibited under Rule	•  AICPA attest and agreed-upon procedures •  Technology control assessments
	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.)	•  Financial reporting control assessments •  Enterprise security architecture assessment

AUDIT COMMITTEE APPROVAL POLICY	AUDIT COMMITTEE REPORTING POLICY
•  “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.	•  A summary of all such services and related fees reported at each regularly scheduled Audit Committee meeting.
•  “One-time” pre-approval for the fund fiscal year within a specified dollar limit for all pre-approved specific service subcategories	•  A summary of all such services and related fees (including comparison to specified dollar limits) reported quarterly.

•  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)

•  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	Services which are not prohibited by the Rule,	•  Tax planning and support •  Tax controversy assistance
	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, or the ability to maintain a desired level of confidentiality.	•  Tax compliance, tax returns, excise tax returns and support •  Tax opinions

AUDIT COMMITTEE APPROVAL POLICY	AUDIT COMMITTEE REPORTING POLICY
•  “One-time” pre-approval for the fund fiscal year within a specified dollar limit	•  A summary of all such services and related fees (including comparison to specified dollar limits) reported quarterly.
•  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)
•  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”

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.	•  Business Risk Management support •  Other control and regulatory compliance projects

AUDIT COMMITTEE APPROVAL POLICY	AUDIT COMMITTEE REPORTING POLICY
•  “One-time” pre-approval for the fund fiscal year within a specified dollar limit	•  A summary of all such services and related fees (including comparison to specified dollar limits) reported quarterly.
•  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)
•  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”

SECTION III - POLICY DETAIL, CONTINUED

SERVICE CATEGORY	SERVICE CATEGORY DESCRIPTION	SPECIFIC PROHIBITED SERVICE SUBCATEGORIES
PROHIBITED SERVICES	Services which result in the auditors losing independence status under the Rule.	1.  Bookkeeping or other services related to the accounting records or financial statements of the audit 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
•  These services are not to be performed with the exception of the(*) services that may be permitted if they would not be subject to audit procedures at the audit client (as defined in rule 2-01(f)(4)) level the firm providing the service.	•  A summary of all services and related fees reported at each regularly scheduled Audit Committee meeting will serve as continual confirmation that has not provided any restricted services.

GENERAL AUDIT COMMITTEE APPROVAL POLICY:

• 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.

• 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.

• 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 August 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 $17,888 and $17,200 during the fiscal years ended August 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 Core Trust I

By (Signature and Title)* /s/ Lisa M. Jones

Lisa M. Jones, President and Chief Executive Officer

Date November 7, 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 November 7, 2023

By (Signature and Title)* /s/ Anthony J. Koenig, Jr.

Anthony J. Koenig, Jr., Managing Director, Chief Operations Officer & Treasurer of the Funds

Date November 7, 2023

* Print the name and title of each signing officer under his or her signature.

EX-99.CODE ETH

CODE OF ETHICS

FOR

SENIOR OFFICERS

POLICY

This Code of Ethics for Senior Officers (this “Code”) sets forth the policies, practices and values expected to be exhibited by Senior Officers of the Pioneer Funds (collectively, the “Funds” and each, a “Fund”). This Code does not apply generally to officers and employees of service providers to the Funds, including Amundi Asset Management US, Inc., and Amundi Distributor US, Inc. (collectively, “Amundi US”), unless such officers and employees are also Senior Officers.

The term “Senior Officers” shall mean the principal executive officer, principal financial officer, principal accounting officer and controller of the Funds, although one person may occupy more than one such office. Each Senior Officer is identified by title in Exhibit A to this Code.

The Chief Compliance Officer (“CCO”) of the Pioneer Funds is primarily responsible for implementing and monitoring compliance with this Code, subject to the overall supervision of the Board of Trustees of the Funds (the “Board”). The CCO has the authority to interpret this Code and its applicability to particular situations. Any questions about this Code should be directed to the CCO or his or her designee.

PURPOSE

The purposes of this Code are to:

• Promote honest and ethical conduct, including the ethical handling of actual or apparent conflicts of interest between personal and professional relationships;

• Promote full, fair, accurate, timely and understandable disclosure in reports and documents that the Fund files with, or submits to, the Securities and Exchange Commission (“SEC”) and in other public communications made by the Fund;

• Promote compliance with applicable laws and governmental rules and regulations;

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• Promote the prompt internal reporting of violations of the Code to an appropriate person or persons identified in the Code; and

• Establish accountability for adherence to the Code.

Each Senior Officer should adhere to a high standard of business ethics and should be sensitive to situations that may give rise to actual as well as apparent conflicts of interest.

RESPONSIBILITIES OF SENIOR OFFICERS

Conflicts of Interest

A “conflict of interest” occurs when a Senior Officer’s private interests interfere in any way – or even appear to interfere – with the interests of or his/her service to a Fund. A conflict can arise when a Senior Officer takes actions or has interests that may make it difficult to perform his or her Fund work objectively and effectively. Conflicts of interest also arise when a Senior Officer or a member of his/her family receives improper personal benefits as a result of the Senior Officer’s position with the Fund.

Certain conflicts of interest arise out of the relationships between Senior Officers and the Fund and already are subject to conflict of interest provisions in the Investment Company Act of 1940, as amended (the “ICA”), and the Investment Advisers Act of 1940, as amended (the “IAA”). For example, Senior Officers may not individually engage in certain transactions (such as the purchase or sale of securities or other property) with the Funds because of their status as “affiliated persons” of the Funds. The Fund’s and Amundi US’ compliance programs and procedures are designed to prevent, or identify and correct, violations of these provisions. This Code does not, and is not intended to, repeat or replace such policies and procedures, and such conflicts fall outside of the parameters of this Code.

Although typically not presenting an opportunity for improper personal benefit, conflicts arise as a result of the contractual relationship between the Fund and Amundi US because the Senior Officers are officers or employees of both. As a result, this Code recognizes that Senior Officers will, in the normal course of their duties (whether formally for a Fund or for Amundi US, or for both), be involved in establishing policies and implementing decisions that will have different effects on Amundi US and the Fund. The participation of Senior Officers in such activities is inherent in the contractual relationship between a Fund and Amundi US and is consistent with the performance by the Senior Officers of their duties as officers of the Fund and, if addressed in conformity with the provisions of the ICA and the IAA, will be deemed to have been handled ethically. In addition, it is recognized by the Board that Senior Officers may also be officers of investment companies other than the Pioneer Funds.

Other conflicts of interest are covered by this Code, even if such conflicts of interest are not subject to provisions of the ICA or the IAA. In reading the following examples of conflicts of interest under this Code, Senior Officers should keep in mind that such a list cannot ever be exhaustive or cover every possible scenario. It follows that the overarching principle is that the personal interest of a Senior Officer should not be placed improperly before the interest of a Fund.

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Each Senior Officer must:

• Not use his or her personal influence or personal relationships improperly to influence investment decisions or financial reporting by a Fund whereby the Senior Officer would benefit personally to the detriment of the Fund;

• Not cause a Fund to take action, or fail to take action, for the individual personal benefit of the Senior Officer rather than the benefit of the Fund; and

• Report at least annually any affiliations or other relationships that give rise to conflicts of interest.

Any material conflict of interest situation should be approved by the CCO, his or her designee or the Board. Examples of these include:

• Service as a director on the board of any public or private company;

• The receipt of any gift with a value in excess of an amount established from time to time by Amundi US’ Business Gift and Entertainment Policy from any single non-relative person or entity. Customary business lunches, dinners and entertainment at which both the Senior Officer and the giver are present, and promotional items of insignificant value are exempt from this prohibition;

• The receipt of any entertainment from any company with which a Fund has current or prospective business dealings unless such entertainment is business-related, reasonable in cost, appropriate as to time and place, and not so frequent as to raise any question of impropriety;

• Any ownership interest in, or any consulting or employment relationship with, any of a Fund’s service providers other than its investment adviser, principal underwriter, administrator or any affiliated person thereof; and

• A direct or indirect financial interest in commissions, transaction charges or spreads paid by a Fund for effecting portfolio transactions or for selling or redeeming shares other than an interest arising from the Senior Officer’s employment, such as compensation or equity ownership.

Corporate Opportunities

Senior Officers may not (a) take for themselves personally opportunities that are discovered through the use of a Fund’s property, information or position; (b) use a Fund’s property, information, or position for personal gain; or (c) compete with a Fund. Senior Officers owe a duty to the Funds to advance their legitimate interests when the opportunity to do so arises.

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Confidentiality

Senior Officers should maintain the confidentiality of information entrusted to them by the Funds, except when disclosure is authorized or legally mandated. Confidential information includes all non-public information that might be of use to competitors, or harmful to the Funds, if disclosed.

Fair dealing with Fund shareholders, suppliers, and competitors

Senior Officers should endeavor to deal fairly with the Funds’ shareholders, suppliers, and competitors. Senior Officers should not take unfair advantage of anyone through manipulation, concealment, abuse of privileged information, misrepresentation of material facts, or any other unfair-dealing practice. Senior Officers should not knowingly misrepresent or cause others to misrepresent facts about a Fund to others, whether within or outside the Fund, including to the Board, the Funds’ auditors or to governmental regulators and self-regulatory organizations.

Compliance with Law

Each Senior Officer must not knowingly violate any law, rule and regulation applicable to his or her activities as an officer of the Funds. In addition, Senior Officers are responsible for understanding and promoting compliance with the laws, rules and regulations applicable to his or her particular position and by persons under the Senior Officer’s supervision. Senior Officers should endeavor to comply not only with the letter of the law, but also with the spirit of the law.

Disclosure

Each Senior Officer should familiarize himself or herself with the disclosure requirements generally applicable to the Funds. Each Senior Officer should, to the extent appropriate within his or her area of responsibility, consult with other officers of the Funds and Amundi US with the goal of promoting full, fair, accurate, timely and understandable disclosure in the reports and documents a Fund files with, or submits to, the SEC and in other public communications made by the Funds.

INITIAL AND ANNUAL CERTIFICATIONS

Upon becoming a Senior Officer the Senior Officer is required to certify that he or she has received, read, and understands this Code. On an annual basis, each Senior Officer must certify that he or she has complied with all of the applicable requirements of this Code.

ADMINISTRATION AND ENFORCEMENT OF THE CODE

Report of Violations

Amundi US relies on each Senior Officer to report promptly if he or she knows of any conduct by a Senior Officer in violation of this Code. All violations or suspected violations of this Code must be reported to the CCO or a member of Amundi US’ Legal and Compliance Department. Failure to do so is itself a violation of this Code. 

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Investigation of Violations

Upon notification of a violation or suspected violation, the CCO or other members of Amundi US’ Compliance Department will take all appropriate action to investigate the potential violation reported. If, after such investigation, the CCO believes that no violation has occurred, the CCO and Compliance Department is not required to take no further action. Any matter the CCO believes is a violation will be reported to the Independent Trustees. If the Independent Trustees concur that a violation has occurred, they will inform and make a recommendation to the full Board. The Board shall be responsible for determining appropriate action. The Funds, their officers and employees, will not retaliate against any Senior Officer for reports of potential violations that are made in good faith and without malicious intent.

The CCO or his or her designee is responsible for applying this Code to specific situations in which questions are presented under it and has the authority to interpret this Code in any particular situation. The CCO or his or her designee shall make inquiries regarding any potential conflict of interest. 

Violations and Sanctions

Compliance with this Code is expected and violations of its provisions will be taken seriously and could result in disciplinary action. In response to violations of the Code, the Board may impose such sanctions as it deems appropriate within the scope of its authority over Senior Officers, including termination as an officer of the Funds.

Waivers from the Code

The Independent Trustees will consider any approval or waiver sought by any Senior Officer.

The Independent Trustees will be responsible for granting waivers, as appropriate. Any change to or waiver of this Code will, to the extent required, be disclosed as provided by SEC rules.

OTHER POLICIES AND PROCEDURES

This Code shall be the sole Code of Ethics adopted by the Funds for purposes of Section 406 of the Sarbanes-Oxley Act and the rules and forms applicable to registered investment companies thereunder. The Funds’ and Amundi US’ Codes of Ethics under Rule 17j-1 under the ICA and Rule 204A-1 of the IAA are separate requirements applying to the Senior Officers and others, and are not a part of this Code. To the extent any other policies and procedures of the Funds or Amundi US overlap or conflict with the provisions of the Code, they are superseded by this Code.

SCOPE OF RESPONSIBILITIES

A Senior Officer’s responsibilities under this Code are limited to Fund matters over which the Senior Officer has direct responsibility or control, matters in which the Senior Officer routinely participates, and matters with which the Senior Officer is otherwise involved. In addition, a Senior Officer is responsible for matters of which the Senior Officer has actual knowledge.

5 Last revised January 2021

AMENDMENTS

This Code other than Exhibit A may not be amended except in a writing that is specifically approved or ratified by a majority vote of the Board, including a majority of the Independent Trustees.

CONFIDENTIALITY

All reports and records prepared or maintained pursuant to this Code will be considered confidential and shall be maintained and protected accordingly. Except as otherwise required by law or this Code, such matters shall not be disclosed to anyone other than the Board and their counsel, or to Amundi US’ Legal and Compliance Department.

INTERNAL USE

This Code is intended solely for the internal use by the Funds and does not constitute an admission, by or on behalf of any Fund, as to any fact, circumstance, or legal conclusion.

6 Last revised January 2021

EXHIBIT A – SENIOR OFFICERS OF THE PIONEER FUNDS (EFFECTIVE AS OF AUGUST 14, 2008)

President (Principal Executive Officer)

Treasurer (Principal Financial Officer)

Code of Ethics for Senior Officers 

EX-99.CERT

CERTIFICATION PURSUANT TO RULE 30a-2(a)

UNDER THE 1940 ACT AND SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

I, Lisa M. Jones, certify that:

1. I have reviewed this report on Form N-CSR of Pioneer Core Trust I;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and

d. Disclosed in this report any change in the registrants internal control over financial reporting that occurred during the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrants internal control over financial reporting; and

5. The registrants other certifying officer and I have disclosed to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies in the design or operation of internal controls over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize, and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 7, 2023

/s/ Lisa M. Jones

Lisa M. Jones

President and Chief Executive Officer

CERTIFICATION PURSUANT TO RULE 30a-2(a)

UNDER THE 1940 ACT AND SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

I, Anthony J. Koenig, Jr., certify that:

1. I have reviewed this report on Form N-CSR of Pioneer Core Trust I;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;

4. The registrants other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and

d. Disclosed in this report any change in the registrants internal control over financial reporting that occurred during the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrants internal control over financial reporting; and

5. The registrants other certifying officer and I have disclosed to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies in the design or operation of internal controls over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize, and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 7, 2023

/s/ Anthony J. Koenig, Jr

Anthony J. Koenig, Jr.

Managing Director, Chief Operations Officer & Treasurer of the Funds

EX-99.906 CERT

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY

ACT OF 2002

I, Lisa M. Jones, certify that, to the best of my knowledge:

1. The Form N-CSR (the Report) of Pioneer Core Trust I fully complies for the period covered by the Report with the requirements of Section 13(a) or 15 (d), as applicable, of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of the operations of the Trust.

Date: November 7, 2023

/s/ Lisa M. Jones

Lisa M. Jones

President and Chief Executive Officer

This certification is being furnished pursuant to Rule 30a-2(b) under the Investment Company Act of 1940, as amended, and 18 U.S.C. section 1350 and is not being filed as part of the Report with the Securities and Exchange Commission.

A signed original of this written statement required by section 906 has been provided to the Trust and will be retained by the Trust and furnished to the Securities Exchange Commission or its staff upon request.

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY

ACT OF 2002

I, Anthony J. Koenig, Jr., certify that, to the best of my knowledge:

1. The Form N-CSR (the Report) of Pioneer Core Trust I fully complies for the period covered by the Report with the requirements of Section 13(a) or 15 (d), as applicable, of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of the operations of the Trust.

Date: November 7, 2023

/s/ Anthony J. Koenig, Jr.

Anthony J. Koenig, Jr.

Managing Director, Chief Operations Officer & Treasurer of the Funds

This certification is being furnished pursuant to Rule 30a-2(b) under the Investment Company Act of 1940, as amended, and 18 U.S.C. section 1350 and is not being filed as part of the Report with the Securities and Exchange Commission.

A signed original of this written statement required by section 906 has been provided to the Trust and will be retained by the Trust and furnished to the Securities Exchange Commission or its staff upon request.